chore: bump version to 0.0.2-beta.3 (#345)

* [AGC] Decode VOP3P and emit packed f16 arithmetic (first slice)

On gfx10 the VOP3P family lives under its own 0b110011000 prefix (word0
top byte 0xCC), which the major-opcode switch currently routes to the
SMEM branch, so packed instructions were decoded as scalar memory ops
and emitted as silent no-ops. Intercept the exact 9-bit prefix ahead of
the switch, decode the five packed-f16 arithmetic opcodes with their
op_sel/op_sel_hi/neg_lo/neg_hi/clamp modifiers, and emit them as
UnpackHalf2x16 -> component-wise f32 vec2 ops -> PackHalf2x16 so no
Float16 capability is needed.

Bit layout and opcode numbers pinned to LLVM MC test encodings
(vop3p.s, gfx10_vop3p_literalv216.txt) and VOP3PInstructions.td.
Unsupported modifiers, packed constants and out-of-scope packed opcodes
fail with a clear error instead of emitting wrong results.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* [AGC] Make packed f16 exact and drop v_pk_fma_f16 (review response)

Address the FP16 correctness review on the VOP3P slice.

Replace GLSL UnpackHalf2x16/PackHalf2x16 with explicit integer f16<->f32
conversions (EmitHalfToFloat/EmitFloatToHalf): exact widening with subnormal
normalisation, and narrowing with round-to-nearest-even, overflow-to-Inf and
NaN/Inf handling. Their subnormal and rounding behaviour no longer depends on
implementation-defined float-controls modes.

With exact conversions, v_pk_add_f16 and v_pk_mul_f16 are bit-exact to a true
f16 op (f32 result rounds losslessly to f16; a f16 product fits in f32). Emit
v_pk_min_f16/v_pk_max_f16 as fminnum_like/fmaxnum_like (NaN operand returns the
other; ordered numeric compare) instead of GLSL FMin/FMax.

v_pk_fma_f16 now fails emission loudly: a fused f16 FMA rounds once, an f32
multiply-add then pack double-rounds (fma(0x4100,0x7522,0x04EA) is 0x7A6B fused
vs 0x7A6A via f32). Exact fused emulation is a planned follow-up slice.

ShaderDump gains an Expect model (Translates/DecodeFails/EmitFails) and packed
regressions: arith, non-default modifiers, and loud-failure pins for the fma
case above and for clamp.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: tensorcrush <tensorcrush@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Antigravity AI <antigravity@gemini.com>

.github/pull_request_template.md

@@ -0,0 +1,27 @@
+## Before submitting
+
+Please read our contribution guidelines before opening a pull request:
+
+➡️ [**CONTRIBUTING.md**](https://github.com/sharpemu/sharpemu/blob/main/CONTRIBUTING.md)
+
+By opening this pull request, you confirm that you have read and agree to follow the contribution guidelines.
+
+## Testing
+
+If applicable, list the game(s) you tested and briefly describe the results.
+
+Example:
+
+- Demon's Souls (PPSA01341) – Boots to splash screen.
+- Dreaming Sarah – Save/load works correctly.
+
+If your changes do not affect runtime behavior (e.g. documentation, tooling, CI), write `N/A`.
+
+## Checklist
+
+By submitting this pull request, you confirm that:
+
+- [ ] I have read and followed `CONTRIBUTING.md`.
+- [ ] I tested my changes or marked the testing section as `N/A`.
+- [ ] I wrote this pull request description myself and did not paste AI-generated explanations.
+- [ ] I listed the game(s) I tested (or marked the testing section as `N/A`).

.github/workflows/notify-site.yml

@@ -0,0 +1,31 @@
+# Copyright (C) 2026 SharpEmu Emulator Project
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# Tells the website repo to rebuild when a release is published, so
+# sharpemu.app/downloads lists the new build within a minute.
+name: Notify website
+
+on:
+  release:
+    types: [published, released, edited, deleted]
+  workflow_dispatch:
+
+jobs:
+  dispatch:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger sharpemu-site rebuild
+        env:
+          TOKEN: ${{ secrets.SITE_DISPATCH_TOKEN }}
+        run: |
+          if [ -z "$TOKEN" ]; then
+            echo "SITE_DISPATCH_TOKEN is not set — skipping website rebuild."
+            exit 0
+          fi
+          curl -fsS -X POST \
+            -H "Authorization: Bearer $TOKEN" \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/sharpemu/sharpemu-site/dispatches \
+            -d '{"event_type":"release-published"}'
+          echo "Website rebuild requested."

.github/workflows/workflow.yml

@@ -7,6 +7,8 @@ on:
   push:
     branches:
       - "**"
+    tags:
+      - "v*"
     paths-ignore:
       - "**/*.md"
       - "**/*.png"
@@ -53,6 +55,11 @@ jobs:
           release_tag="v${version}"
           release_name="SharpEmu v${version}"
 
+          if [ "${GITHUB_REF_TYPE}" = "tag" ] && [ "${GITHUB_REF_NAME}" != "${release_tag}" ]; then
+            echo "Release tag ${GITHUB_REF_NAME} does not match project version ${release_tag}." >&2
+            exit 1
+          fi
+
           {
             echo "short-sha=${short_sha}"
             echo "safe-ref=${safe_ref}"
@@ -203,7 +210,9 @@ jobs:
       - init
       - build
       - build-posix
-    if: github.event_name == 'workflow_dispatch' || (github.event_name == 'push' && github.ref == 'refs/heads/main')
+    # Versioned releases are immutable and tag-driven. Branch and manual runs
+    # still produce Actions artifacts without modifying a published release.
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
     runs-on: ubuntu-latest
     permissions:
       contents: write
@@ -213,7 +222,7 @@ jobs:
         with:
           path: release
 
-      - name: Create or update release
+      - name: Create release
         shell: bash
         env:
           GH_REPO: ${{ github.repository }}
@@ -231,26 +240,11 @@ jobs:
           notes="Automated SharpEmu v${VERSION} build for commit ${GITHUB_SHA}."
 
           if gh release view "${RELEASE_TAG}" >/dev/null 2>&1; then
-            gh release upload "${RELEASE_TAG}" "${assets[@]}" --clobber
-            gh release edit "${RELEASE_TAG}" --title "${RELEASE_NAME}" --notes "${notes}"
-          else
-            gh release create "${RELEASE_TAG}" "${assets[@]}" \
-              --title "${RELEASE_NAME}" \
-              --notes "${notes}" \
-              --target "${GITHUB_SHA}"
+            echo "Release ${RELEASE_TAG} already exists and will not be modified." >&2
+            exit 1
           fi
 
-          keep=()
-          for asset_path in "${assets[@]}"; do
-            keep+=("$(basename "${asset_path}")")
-          done
-          mapfile -t release_assets < <(gh release view "${RELEASE_TAG}" --json assets --jq '.assets[].name' | sort)
-          for asset in "${release_assets[@]}"; do
-            case "${asset}" in
-              sharpemu-${VERSION}-*.zip|sharpemu-${VERSION}-*.tar.gz)
-                if ! printf '%s\n' "${keep[@]}" | grep -Fxq "${asset}"; then
-                  gh release delete-asset "${RELEASE_TAG}" "${asset}" --yes
-                fi
-                ;;
-            esac
-          done
+          gh release create "${RELEASE_TAG}" "${assets[@]}" \
+            --verify-tag \
+            --title "${RELEASE_NAME}" \
+            --notes "${notes}"

CONTRIBUTING.md

@@ -5,6 +5,11 @@ SPDX-License-Identifier: GPL-2.0-or-later
 
 # Contributing
 
+> [!IMPORTANT]
+> The pull request template is mandatory.
+>
+> Pull requests that do not follow the template or leave the required checklist incomplete will be closed without review, even if the proposed code is technically correct or beneficial. Please review these contribution guidelines before submitting a pull request.
+
 Contributions are always welcome!
 
 Before opening a pull request, please keep the following in mind:

Directory.Build.props

@@ -9,7 +9,7 @@ SPDX-License-Identifier: GPL-2.0-or-later
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
-    <SharpEmuVersion>0.0.1</SharpEmuVersion>
+    <SharpEmuVersion>0.0.2-beta.3</SharpEmuVersion>
     <Version>$(SharpEmuVersion)</Version>
 
     <RepoRoot>$([MSBuild]::NormalizeDirectory('$(MSBuildThisFileDirectory)'))</RepoRoot>

README.md

@@ -23,11 +23,11 @@ SPDX-License-Identifier: GPL-2.0-or-later
   <strong>Join our Discord for development updates, compatibility discussions, support, and community chat.</strong>
 </p>
 
----
-
-> [!NOTE]  
-> SharpEmu supports Windows x64, Linux x64, and macOS x64. Apple Silicon Macs
-> can run the macOS x64 build through Rosetta 2.
+---
+
+> [!NOTE]  
+> SharpEmu supports Windows x64, Linux x64, and macOS x64. Apple Silicon Macs
+> can run the macOS x64 build through Rosetta 2.
 
 > [!WARNING]  
 > SharpEmu is an experimental PS5 emulator developed from scratch in C#. The current focus is on accuracy and infrastructure setup rather than game-specific compatibility.
@@ -41,6 +41,16 @@ This project is developed purely for research and educational purposes. There ar
 SharpEmu focuses exclusively on the PlayStation 5.  
 Our goal is **not** to emulate PS4 games, as there is already an excellent emulator dedicated to that platform: **ShadPS4**.
 
+## Games Tested
+
+|               Demons Souls Remake                   |                     Dreaming Sarah                         |
+| :-----------------------------------------------------------: | :--------------------------------------------------------------------------------------------: |
+| ![Bloodborne screenshot](./.github/images/demons-souls.jpg) | ![Dreaming Sarah](./.github/images/dreaming-sarah.jpg) |
+
+|                  Void Terrarium                     |                 Dead Cells                    |
+| :------------------------------------------------------------------------: | :------------------------------------------------------------------: |
+| ![Void Terrarium](./.github/images/void-terrarium.jpg) | ![Dead Cells](./.github/images/dead-cells.jpg) |
+
 ## Status
 
 The emulator can currently load the `eboot.bin` of real games, execute native CPU instructions, and partially handle kernel-related functionality. However, several critical components are still missing.
@@ -60,52 +70,33 @@ Current capabilities include:
 
 Some games have reached like `sceVideoOut` and AGC stages.
 
-SharpEmu supports Windows, Linux, and macOS hosts. Video output uses Vulkan on
-Windows and Linux, and MoltenVK on macOS. Platform support is still experimental,
-so compatibility and performance vary by game, operating system, and GPU driver.
-
-## Using
-
-Download the release archive for your operating system, extract it, and launch
-SharpEmu with the path to a legally obtained game's `eboot.bin`.
-
-Windows PowerShell:
-
-```powershell
-.\SharpEmu.exe "C:\path\to\game\eboot.bin" 2>&1 |
-  Tee-Object -FilePath "SharpEmu.log"
-```
-
-Linux and macOS:
-
-```bash
-chmod +x ./SharpEmu
-
-./SharpEmu "/path/to/game/eboot.bin" 2>&1 |
-  tee SharpEmu.log
-```
-
-A Vulkan-capable GPU and current graphics driver are required. The macOS
-release includes the MoltenVK Vulkan implementation.
+SharpEmu supports Windows, Linux, and macOS hosts. Video output uses Vulkan on
+Windows and Linux, and MoltenVK on macOS. Platform support is still experimental,
+so compatibility and performance vary by game, operating system, and GPU driver.
 
-## Games Tested
+## Using
 
-* **Demon's Souls Remake**
-  * [Demon's Souls [PPSA01341]](https://github.com/sharpemu/sharpemu/issues/2)
-  * Demon's Souls is now video loop. Shaders are ready to be converted to SPIR-V/Vulkan. We are continuing our work on this.
-  ![DeS videoOut submit first frame](./.github/images/des-videoout-shaders.jpg)
+Download the release archive for your operating system, extract it, and launch
+SharpEmu with the path to a legally obtained game's `eboot.bin`.
 
-* **Poppy Playtime Chapter 1**
-  * [Poppy Playtime Chapter 1 [PPSA20591]](https://github.com/sharpemu/sharpemu/issues/3)
+Windows PowerShell:
 
-* **SILENT HILL: The Short Message**
-  * [SILENT HILL: The Short Message [PPSA10112]](https://github.com/sharpemu/sharpemu/issues/4)
+```powershell
+.\SharpEmu.exe "C:\path\to\game\eboot.bin" 2>&1 |
+  Tee-Object -FilePath "SharpEmu.log"
+```
 
-* **Dreaming Sarah**
-  * [Dreaming Sarah [PPSA02929]](https://github.com/sharpemu/sharpemu/issues/9)
-  * Real texture rendering for this game;
-  ![Splash texture](./.github/images/dreaming-sarah.jpg)
+Linux and macOS:
 
+```bash
+chmod +x ./SharpEmu
+
+./SharpEmu "/path/to/game/eboot.bin" 2>&1 |
+  tee SharpEmu.log
+```
+
+A Vulkan-capable GPU and current graphics driver are required. The macOS
+release includes the MoltenVK Vulkan implementation.
 
 > [!IMPORTANT]  
 > This project does **not** support or condone piracy.  
@@ -114,7 +105,7 @@ release includes the MoltenVK Vulkan implementation.
 
 ## Build
 
-1. Install the .NET SDK version specified in [`global.json`](./global.json).
+1. Install the .NET SDK version specified in [`global.json`](./global.json).
 2. Clone the repository: `git clone https://github.com/sharpemu/sharpemu.git`
 3. Open the solution file (`SharpEmu.slnx`) in **VSCode**.
 4. Build the project: `dotnet build` or `dotnet publish`

REUSE.toml

@@ -5,10 +5,12 @@ path = [
     "REUSE.toml",
     "nuget.config",
     "global.json",
+    "**/packages.lock.json",
     "scripts/ps5_names.txt",
     "src/SharpEmu.GUI/Languages/**",
     "_logs/**",
     ".github/images/**",
+    ".github/pull_request_template.md",
     "assets/images/**"
 ]
 precedence = "aggregate"

docs/bink2-bridge.md

@@ -0,0 +1,46 @@
+<!--
+Copyright (C) 2026 SharpEmu Emulator Project
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
+
+# Bink 2 bridge
+
+Demon's Souls plays Bink 2 (.bk2) files through a Bink implementation linked
+directly into eboot.bin. It does not use libSceVideodec, therefore an HLE video
+decoder cannot observe or replace those frames.
+
+SharpEmu observes successful guest .bk2 opens and, when a Bink bridge is
+available, presents its decoded BGRA frames at the normal guest-flip boundary.
+This preserves the game's own timing and lets the host Vulkan presenter display
+the movie without trying to execute the PS5-specific Bink GPU decode path.
+
+Without an adapter, Bink movies are skipped by default: their open call returns
+not-found so games that mark cinematics as optional progress to their next
+state instead of waiting on an empty Bink GPU texture.
+
+Set SHARPEMU_BINK_MODE=dummy to retain the open and show a built-in,
+non-decoded placeholder frame. This requires no SDK, but is a visual diagnostic
+only; it does not decode the movie or alter its game logic. Set
+SHARPEMU_BINK_MODE=native to force native bridge mode.
+
+## Supplying the adapter
+
+Bink 2 is proprietary. Obtain a compatible Mac Bink 2 SDK from RAD Game Tools,
+then compile sharpemu_bink2_bridge.c against the SDK's bink.h and Mac library.
+The adapter deliberately contains only a three-function C ABI so the managed
+emulator never depends on RAD's private binary ABI.
+
+Place the resulting libsharpemu_bink2_bridge.dylib next to the SharpEmu
+executable, or point to it explicitly:
+
+    SHARPEMU_BINK2_BRIDGE=/absolute/path/libsharpemu_bink2_bridge.dylib \
+      ./SharpEmu /path/to/eboot.bin
+
+The expected exports are sharpemu_bink2_open_utf8,
+sharpemu_bink2_decode_next_bgra, and sharpemu_bink2_close. The supplied
+adapter opens one movie, exposes BGRA pixels, and advances after each decoded
+frame. The managed side validates dimensions and retains ownership of the
+destination buffer.
+
+If the bridge is absent in native mode, SharpEmu logs one informational line
+and retains the existing guest rendering path.

native/bink2-bridge/sharpemu_bink2_bridge.c

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2026 SharpEmu Emulator Project
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * Build this small adapter with a licensed RAD Bink 2 SDK. The SDK and its
+ * headers are not distributed by SharpEmu. See docs/bink2-bridge.md.
+ */
+
+#include <stdint.h>
+#include "bink.h"
+
+typedef struct sharpemu_bink2_info {
+  uint32_t width;
+  uint32_t height;
+  uint32_t frames_per_second_numerator;
+  uint32_t frames_per_second_denominator;
+} sharpemu_bink2_info;
+
+int sharpemu_bink2_open_utf8(const char *path, HBINK *movie, sharpemu_bink2_info *info) {
+  HBINK bink;
+  if (!path || !movie || !info) return 0;
+
+  bink = BinkOpen(path, 0);
+  if (!bink) return 0;
+
+  *movie = bink;
+  info->width = bink->Width;
+  info->height = bink->Height;
+  info->frames_per_second_numerator = bink->FrameRate;
+  info->frames_per_second_denominator = bink->FrameRateDiv;
+  return 1;
+}
+
+int sharpemu_bink2_decode_next_bgra(HBINK movie, uint8_t *destination,
+                                    uint32_t stride, uint32_t destination_bytes) {
+  uint64_t needed;
+  if (!movie || !destination || stride < movie->Width * 4) return 0;
+  needed = (uint64_t)stride * movie->Height;
+  if (needed > destination_bytes) return 0;
+
+  /* Async Bink I/O has not filled the next frame yet; retry on the next host present. */
+  if (BinkWait(movie)) return 0;
+  BinkDoFrame(movie);
+  BinkCopyToBuffer(movie, destination, stride, movie->Height, 0, 0, BINKSURFACE32RA);
+  BinkNextFrame(movie);
+  return 1;
+}
+
+void sharpemu_bink2_close(HBINK movie) {
+  if (movie) BinkClose(movie);
+}

scripts/RELEASE-USE.md

@@ -0,0 +1,90 @@
+<!--
+Copyright (C) 2026 SharpEmu Emulator Project
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
+
+## Release Script
+
+SharpEmu releases are prepared and published using `scripts/release.py`.
+
+The release process consists of two steps:
+
+1. Prepare the version bump through a pull request.
+2. Create and push the release tag after the pull request has been merged.
+
+### Preparing a Release
+
+Run:
+
+```bash
+python scripts/release.py prepare 0.0.2-beta.2
+```
+
+This command will:
+
+- Verify that the working tree is clean.
+- Update the local `main` branch.
+- Create a new branch named `release/0.0.2-beta.2`.
+- Update `SharpEmuVersion` in `Directory.Build.props`.
+- Create a version bump commit.
+- Push the release branch to the remote repository.
+
+Afterwards, open a pull request from:
+
+```text
+release/0.0.2-beta.2
+```
+
+into:
+
+```text
+main
+```
+
+### Publishing a Release
+
+Once the pull request has been merged, update your local repository:
+
+```bash
+git switch main
+git pull --ff-only
+```
+
+Then create and push the release tag:
+
+```bash
+python scripts/release.py tag 0.0.2-beta.2
+```
+
+This command will:
+
+- Verify that the working tree is clean.
+- Confirm that `Directory.Build.props` contains the requested version.
+- Create an annotated Git tag (`v0.0.2-beta.2`).
+- Push the tag to the remote repository.
+
+Pushing the tag automatically triggers the GitHub Release workflow.
+
+### Version Format
+
+Specify the version **without** the `v` prefix.
+
+Examples:
+
+```text
+0.0.2
+0.0.2-alpha.1
+0.0.2-beta.1
+0.0.2-beta.2
+0.0.2-rc.1
+```
+
+The script automatically prefixes the Git tag with `v`.
+
+### Notes
+
+- Run `prepare` only from the `main` branch.
+- Run `tag` only after the version bump pull request has been merged.
+- Do not create release tags manually before merging the version bump.
+- Both commands require a clean working tree.
+- The version in `Directory.Build.props` must exactly match the version passed to the `tag` command.

scripts/release.py

@@ -0,0 +1,408 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2026 SharpEmu Emulator Project
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+from __future__ import annotations
+
+import argparse
+import re
+import subprocess
+import sys
+from pathlib import Path
+
+
+VERSION_PATTERN = re.compile(r"^\d+\.\d+\.\d+(?:-[0-9A-Za-z.-]+)?$")
+VERSION_ELEMENT_PATTERN = re.compile(
+    r"(<SharpEmuVersion>)([^<]+)(</SharpEmuVersion>)"
+)
+
+
+class ReleaseError(RuntimeError):
+    pass
+
+
+def run_git(
+    *args: str,
+    cwd: Path,
+    capture_output: bool = False,
+) -> str:
+    command = ["git", *args]
+
+    try:
+        result = subprocess.run(
+            command,
+            cwd=cwd,
+            check=True,
+            text=True,
+            capture_output=capture_output,
+        )
+    except FileNotFoundError:
+        raise ReleaseError("Git was not found in PATH.") from None
+    except subprocess.CalledProcessError as error:
+        stderr = error.stderr.strip() if error.stderr else ""
+        detail = f"\n{stderr}" if stderr else ""
+
+        raise ReleaseError(
+            f"Git command failed: {' '.join(command)}{detail}"
+        ) from error
+
+    return result.stdout.strip() if capture_output else ""
+
+
+def find_repository_root(script_path: Path) -> Path:
+    root = run_git(
+        "rev-parse",
+        "--show-toplevel",
+        cwd=script_path.resolve().parent,
+        capture_output=True,
+    )
+
+    return Path(root)
+
+
+def get_status(repository_root: Path) -> str:
+    return run_git(
+        "status",
+        "--porcelain",
+        cwd=repository_root,
+        capture_output=True,
+    )
+
+
+def ensure_clean_worktree(repository_root: Path) -> None:
+    status = get_status(repository_root)
+
+    if status:
+        raise ReleaseError(
+            "The working tree is not clean.\n\n"
+            f"{status}\n\n"
+            "Commit, stash, or remove these changes first."
+        )
+
+
+def get_current_branch(repository_root: Path) -> str:
+    branch = run_git(
+        "branch",
+        "--show-current",
+        cwd=repository_root,
+        capture_output=True,
+    )
+
+    if not branch:
+        raise ReleaseError(
+            "HEAD is detached. Switch to a branch before continuing."
+        )
+
+    return branch
+
+
+def ensure_branch_does_not_exist(
+    repository_root: Path,
+    branch: str,
+    remote: str,
+) -> None:
+    local_branch = run_git(
+        "branch",
+        "--list",
+        branch,
+        cwd=repository_root,
+        capture_output=True,
+    )
+
+    if local_branch:
+        raise ReleaseError(f"Branch {branch} already exists locally.")
+
+    remote_branch = run_git(
+        "ls-remote",
+        "--heads",
+        remote,
+        branch,
+        cwd=repository_root,
+        capture_output=True,
+    )
+
+    if remote_branch:
+        raise ReleaseError(
+            f"Branch {branch} already exists on {remote}."
+        )
+
+
+def ensure_tag_does_not_exist(
+    repository_root: Path,
+    tag: str,
+    remote: str,
+) -> None:
+    local_tag = run_git(
+        "tag",
+        "--list",
+        tag,
+        cwd=repository_root,
+        capture_output=True,
+    )
+
+    if local_tag:
+        raise ReleaseError(f"Tag {tag} already exists locally.")
+
+    remote_tag = run_git(
+        "ls-remote",
+        "--tags",
+        remote,
+        f"refs/tags/{tag}",
+        cwd=repository_root,
+        capture_output=True,
+    )
+
+    if remote_tag:
+        raise ReleaseError(f"Tag {tag} already exists on {remote}.")
+
+
+def read_version(props_path: Path) -> str:
+    if not props_path.exists():
+        raise ReleaseError(f"Version file not found: {props_path}")
+
+    content = props_path.read_text(encoding="utf-8")
+    match = VERSION_ELEMENT_PATTERN.search(content)
+
+    if match is None:
+        raise ReleaseError(
+            f"SharpEmuVersion was not found in {props_path.name}."
+        )
+
+    return match.group(2).strip()
+
+
+def update_version(props_path: Path, version: str) -> str:
+    content = props_path.read_text(encoding="utf-8")
+    current_version = read_version(props_path)
+
+    if current_version == version:
+        raise ReleaseError(
+            f"SharpEmuVersion is already set to {version}."
+        )
+
+    updated_content, replacement_count = VERSION_ELEMENT_PATTERN.subn(
+        rf"\g<1>{version}\g<3>",
+        content,
+        count=1,
+    )
+
+    if replacement_count != 1:
+        raise ReleaseError(
+            "Expected exactly one SharpEmuVersion element."
+        )
+
+    props_path.write_text(
+        updated_content,
+        encoding="utf-8",
+        newline="\n",
+    )
+
+    return current_version
+
+
+def prepare_release(
+    repository_root: Path,
+    props_path: Path,
+    version: str,
+    remote: str,
+) -> None:
+    ensure_clean_worktree(repository_root)
+
+    current_branch = get_current_branch(repository_root)
+
+    if current_branch != "main":
+        raise ReleaseError(
+            f"Prepare must be run from main, not {current_branch}."
+        )
+
+    run_git(
+        "pull",
+        "--ff-only",
+        remote,
+        "main",
+        cwd=repository_root,
+    )
+
+    branch = f"release/{version}"
+    ensure_branch_does_not_exist(
+        repository_root,
+        branch,
+        remote,
+    )
+
+    previous_version = read_version(props_path)
+
+    run_git(
+        "switch",
+        "-c",
+        branch,
+        cwd=repository_root,
+    )
+
+    try:
+        update_version(props_path, version)
+
+        relative_props_path = props_path.relative_to(repository_root)
+
+        run_git(
+            "add",
+            relative_props_path.as_posix(),
+            cwd=repository_root,
+        )
+        run_git(
+            "commit",
+            "-m",
+            f"chore: bump version to {version}",
+            cwd=repository_root,
+        )
+        run_git(
+            "push",
+            "-u",
+            remote,
+            branch,
+            cwd=repository_root,
+        )
+    except Exception:
+        print(
+            "\nPrepare failed. The release branch may still exist locally.",
+            file=sys.stderr,
+        )
+        raise
+
+    print()
+    print(f"Prepared release {previous_version} -> {version}")
+    print(f"Branch pushed: {branch}")
+    print()
+    print("Open a pull request from:")
+    print(f"  {branch}")
+    print("into:")
+    print("  main")
+    print()
+    print("After merging the PR, run:")
+    print(f"  python scripts/release.py tag {version}")
+
+
+def create_release_tag(
+    repository_root: Path,
+    props_path: Path,
+    version: str,
+    remote: str,
+) -> None:
+    ensure_clean_worktree(repository_root)
+
+    current_branch = get_current_branch(repository_root)
+
+    if current_branch != "main":
+        raise ReleaseError(
+            f"Tagging must be run from main, not {current_branch}."
+        )
+
+    run_git(
+        "pull",
+        "--ff-only",
+        remote,
+        "main",
+        cwd=repository_root,
+    )
+
+    current_version = read_version(props_path)
+
+    if current_version != version:
+        raise ReleaseError(
+            "Version mismatch:\n"
+            f"  Directory.Build.props: {current_version}\n"
+            f"  Requested tag:         {version}"
+        )
+
+    tag = f"v{version}"
+
+    ensure_tag_does_not_exist(
+        repository_root,
+        tag,
+        remote,
+    )
+
+    run_git(
+        "tag",
+        "-a",
+        tag,
+        "-m",
+        f"SharpEmu {version}",
+        cwd=repository_root,
+    )
+    run_git(
+        "push",
+        remote,
+        tag,
+        cwd=repository_root,
+    )
+
+    print()
+    print(f"Successfully pushed tag {tag}.")
+    print("The release workflow should start automatically.")
+
+
+def parse_arguments() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(
+        description="Prepare or tag a SharpEmu release."
+    )
+
+    subparsers = parser.add_subparsers(
+        dest="command",
+        required=True,
+    )
+
+    for command in ("prepare", "tag"):
+        subparser = subparsers.add_parser(command)
+        subparser.add_argument(
+            "version",
+            help="Version without the v prefix, e.g. 0.0.2-beta.2.",
+        )
+        subparser.add_argument(
+            "--remote",
+            default="origin",
+            help="Git remote. Default: origin.",
+        )
+
+    arguments = parser.parse_args()
+
+    if not VERSION_PATTERN.fullmatch(arguments.version):
+        parser.error(
+            "Version must look like 0.0.2, "
+            "0.0.2-beta.2, or 0.0.2-rc.1."
+        )
+
+    return arguments
+
+
+def main() -> int:
+    arguments = parse_arguments()
+
+    try:
+        repository_root = find_repository_root(Path(__file__))
+        props_path = repository_root / "Directory.Build.props"
+
+        if arguments.command == "prepare":
+            prepare_release(
+                repository_root,
+                props_path,
+                arguments.version,
+                arguments.remote,
+            )
+        else:
+            create_release_tag(
+                repository_root,
+                props_path,
+                arguments.version,
+                arguments.remote,
+            )
+    except ReleaseError as error:
+        print(f"Error: {error}", file=sys.stderr)
+        return 1
+
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

src/SharpEmu.CLI/Program.cs

@@ -45,6 +45,11 @@ internal static partial class Program
     [STAThread]
     private static int Main(string[] args)
     {
+        // Avoid blocking full collections while guest and render threads are
+        // running, and establish the GC mode before the runtime reserves the
+        // fixed guest address-space window.
+        System.Runtime.GCSettings.LatencyMode = System.Runtime.GCLatencyMode.SustainedLowLatency;
+
         try
         {
             return Run(args);
@@ -58,11 +63,15 @@ internal static partial class Program
 
     private static int Run(string[] args)
     {
-        args = NormalizeInternalArguments(args, out var isMitigatedChild);
-        if (args.Length == 0 && !isMitigatedChild)
+        if (Updater.TryApply(args, out var updateExitCode))
+        {
+            return updateExitCode;
+        }
+
+        args = NormalizeInternalArguments(args, out var isMitigatedChild);
+
+        if (args.Length == 0)
         {
-            // No arguments: open the desktop frontend. Any argument selects
-            // the classic CLI behavior below.
             return GuiLauncher.Run();
         }
 
@@ -84,6 +93,7 @@ internal static partial class Program
         {
             if (OperatingSystem.IsMacOS())
             {
+                ConfigureMoltenVkDefaults();
                 PreloadMacVulkanLoader();
             }
 
@@ -151,6 +161,26 @@ internal static partial class Program
         return false;
     }
 
+    /// <summary>
+    /// Applies MoltenVK performance defaults before the Vulkan loader is
+    /// loaded. Existing user-provided values always take precedence.
+    /// </summary>
+    private static void ConfigureMoltenVkDefaults()
+    {
+        try
+        {
+            _ = MacSetEnv("MVK_CONFIG_SYNCHRONOUS_QUEUE_SUBMITS", "0", 0);
+            _ = MacSetEnv("MVK_CONFIG_SHOULD_MAXIMIZE_CONCURRENT_COMPILATION", "1", 0);
+            _ = MacSetEnv("MVK_CONFIG_USE_METAL_ARGUMENT_BUFFERS", "1", 0);
+            _ = MacSetEnv("MVK_CONFIG_RESUME_LOST_DEVICE", "1", 0);
+        }
+        catch (Exception exception)
+        {
+            Console.Error.WriteLine(
+                $"[LOADER][WARN] Failed to set MoltenVK defaults: {exception.Message}");
+        }
+    }
+
     /// <summary>
     /// Makes a Vulkan loader visible to GLFW's dlopen("libvulkan.1.dylib").
     /// Homebrew's Vulkan libraries are arm64-only and cannot load into this
@@ -197,7 +227,17 @@ internal static partial class Program
             return childExitCode;
         }
 
-        if (!TryParseArguments(args, out var ebootPath, out var runtimeOptions, out var logLevel, out var logFilePath))
+        if (!TryExtractHostSurfaceArgument(args, out var emulatorArgs, out var hostSurface, out var hostSurfaceError))
+        {
+            Console.Error.WriteLine($"[LOADER][ERROR] {hostSurfaceError}");
+            return 1;
+        }
+
+        HostSessionControl.SetEmbeddedHostSurface(
+            hostSurface?.WindowHandle ?? 0,
+            hostSurface?.DisplayHandle ?? 0);
+
+        if (!TryParseArguments(emulatorArgs, out var ebootPath, out var runtimeOptions, out var logLevel, out var logFilePath))
         {
             PrintUsage();
             return 1;
@@ -224,66 +264,122 @@ internal static partial class Program
 
         Console.Error.WriteLine("[DEBUG] Creating runtime...");
 
-        using var runtime = SharpEmuRuntime.CreateDefault(runtimeOptions);
-
-        OrbisGen2Result result;
-        ConsoleCancelEventHandler? cancelHandler = null;
         try
         {
-            cancelHandler = (_, eventArgs) =>
+            if (hostSurface is not null && !VulkanVideoHost.TryAttachSurface(hostSurface))
             {
-                eventArgs.Cancel = true;
-                VideoOutExports.NotifyHostInterrupt();
-            };
-            Console.CancelKeyPress += cancelHandler;
+                Console.Error.WriteLine("[LOADER][ERROR] The requested GUI host surface is already active.");
+                return 3;
+            }
 
-            Console.Error.WriteLine($"[DEBUG] Running: {ebootPath}");
-            result = runtime.Run(ebootPath);
-            Console.Error.WriteLine($"[DEBUG] Result: {result}");
-        }
-        catch (Exception ex)
-        {
-            Console.Error.WriteLine($"[DEBUG] Exception: {ex}");
-            Log.Error("SharpEmu failed to run.", ex);
-            return 3;
+            using var runtime = SharpEmuRuntime.CreateDefault(runtimeOptions);
+
+            OrbisGen2Result result;
+            ConsoleCancelEventHandler? cancelHandler = null;
+            try
+            {
+                cancelHandler = (_, eventArgs) =>
+                {
+                    eventArgs.Cancel = true;
+                    VideoOutExports.NotifyHostInterrupt();
+                };
+                Console.CancelKeyPress += cancelHandler;
+
+                Console.Error.WriteLine($"[DEBUG] Running: {ebootPath}");
+                result = runtime.Run(ebootPath);
+                Console.Error.WriteLine($"[DEBUG] Result: {result}");
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"[DEBUG] Exception: {ex}");
+                Log.Error("SharpEmu failed to run.", ex);
+                return 3;
+            }
+            finally
+            {
+                if (cancelHandler is not null)
+                {
+                    Console.CancelKeyPress -= cancelHandler;
+                }
+            }
+
+            Log.Info($"SharpEmu execution completed. Result={result} (0x{(int)result:X8})");
+            if (!string.IsNullOrWhiteSpace(runtime.LastSessionSummary))
+            {
+                Log.Info(runtime.LastSessionSummary);
+            }
+
+            if (!string.IsNullOrWhiteSpace(runtime.LastBasicBlockTrace))
+            {
+                Log.Info("BB trace:");
+                Log.Info(runtime.LastBasicBlockTrace);
+            }
+
+            if (!string.IsNullOrWhiteSpace(runtime.LastMilestoneLog))
+            {
+                Log.Info(runtime.LastMilestoneLog);
+            }
+
+            if (result != OrbisGen2Result.ORBIS_GEN2_OK && !string.IsNullOrWhiteSpace(runtime.LastExecutionDiagnostics))
+            {
+                Log.Warn(runtime.LastExecutionDiagnostics);
+            }
+
+            if (runtimeOptions.ImportTraceLimit > 0 && !string.IsNullOrWhiteSpace(runtime.LastExecutionTrace))
+            {
+                Log.Info("Import trace:");
+                Log.Info(runtime.LastExecutionTrace);
+            }
+
+            return result == OrbisGen2Result.ORBIS_GEN2_OK ? 0 : 4;
         }
         finally
         {
-            if (cancelHandler is not null)
+            HostSessionControl.SetEmbeddedHostSurface(0);
+            if (hostSurface is not null)
             {
-                Console.CancelKeyPress -= cancelHandler;
+                VulkanVideoHost.RequestClose();
+                VulkanVideoHost.DetachSurface(hostSurface);
+                hostSurface.Dispose();
+            }
+        }
+    }
+
+    private static bool TryExtractHostSurfaceArgument(
+        IReadOnlyList<string> args,
+        out string[] emulatorArgs,
+        out VulkanHostSurface? hostSurface,
+        out string? error)
+    {
+        const string hostSurfacePrefix = "--host-surface=";
+        var remaining = new List<string>(args.Count);
+        hostSurface = null;
+        error = null;
+        foreach (var argument in args)
+        {
+            if (!argument.StartsWith(hostSurfacePrefix, StringComparison.OrdinalIgnoreCase))
+            {
+                remaining.Add(argument);
+                continue;
+            }
+
+            if (hostSurface is not null)
+            {
+                emulatorArgs = [];
+                error = "more than one GUI host surface was specified";
+                return false;
+            }
+
+            var descriptor = argument[hostSurfacePrefix.Length..];
+            if (!VulkanHostSurface.TryCreateChildProcessSurface(descriptor, out hostSurface, out error))
+            {
+                emulatorArgs = [];
+                return false;
             }
         }
 
-        Log.Info($"SharpEmu execution completed. Result={result} (0x{(int)result:X8})");
-        if (!string.IsNullOrWhiteSpace(runtime.LastSessionSummary))
-        {
-            Log.Info(runtime.LastSessionSummary);
-        }
-
-        if (!string.IsNullOrWhiteSpace(runtime.LastBasicBlockTrace))
-        {
-            Log.Info("BB trace:");
-            Log.Info(runtime.LastBasicBlockTrace);
-        }
-
-        if (!string.IsNullOrWhiteSpace(runtime.LastMilestoneLog))
-        {
-            Log.Info(runtime.LastMilestoneLog);
-        }
-
-        if (result != OrbisGen2Result.ORBIS_GEN2_OK && !string.IsNullOrWhiteSpace(runtime.LastExecutionDiagnostics))
-        {
-            Log.Warn(runtime.LastExecutionDiagnostics);
-        }
-
-        if (runtimeOptions.ImportTraceLimit > 0 && !string.IsNullOrWhiteSpace(runtime.LastExecutionTrace))
-        {
-            Log.Info("Import trace:");
-            Log.Info(runtime.LastExecutionTrace);
-        }
-
-        return result == OrbisGen2Result.ORBIS_GEN2_OK ? 0 : 4;
+        emulatorArgs = remaining.ToArray();
+        return true;
     }
 
     private static void EnsureCliConsole()
@@ -380,7 +476,9 @@ internal static partial class Program
         return handle != 0 && handle != -1;
     }
 
-    private static string[] NormalizeInternalArguments(string[] args, out bool isMitigatedChild)
+    private static string[] NormalizeInternalArguments(
+        string[] args,
+        out bool isMitigatedChild)
     {
         isMitigatedChild = false;
         var trustedMitigatedChild = string.Equals(
@@ -1319,4 +1417,7 @@ internal static partial class Program
         uint creationDisposition,
         uint flagsAndAttributes,
         nint templateFile);
+
+    [DllImport("libSystem", EntryPoint = "setenv")]
+    private static extern int MacSetEnv(string name, string value, int overwrite);
 }

src/SharpEmu.CLI/SharpEmu.CLI.csproj

@@ -25,7 +25,11 @@ SPDX-License-Identifier: GPL-2.0-or-later
     <EnableCompressionInSingleFile>true</EnableCompressionInSingleFile>
     <ImplicitUsings>enable</ImplicitUsings>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <ServerGarbageCollection>true</ServerGarbageCollection>
+    <!-- Server GC reserves one large heap range per logical processor. On
+         high-core-count hosts those ranges can overlap fixed PS5 image bases
+         before the guest address space is established. Workstation GC avoids
+         that collision and keeps the emulator's required mappings available. -->
+    <ServerGarbageCollection>false</ServerGarbageCollection>
     <ConcurrentGarbageCollection>true</ConcurrentGarbageCollection>
     <TieredPGO>true</TieredPGO>
   </PropertyGroup>
@@ -50,6 +54,7 @@ SPDX-License-Identifier: GPL-2.0-or-later
   <PropertyGroup Condition="'$(RuntimeIdentifier)' == 'win-x64' Or '$(RuntimeIdentifier)' == ''">
     <ApplicationIcon>..\..\assets\images\SharpEmu.ico</ApplicationIcon>
     <Win32Icon>..\..\assets\images\SharpEmu.ico</Win32Icon>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
   </PropertyGroup>
 
   <PropertyGroup>

src/SharpEmu.CLI/app.manifest

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+Copyright (C) 2026 SharpEmu Emulator Project
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
+
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="SharpEmu" />
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- Required by Avalonia NativeControlHost on Windows 10 and 11. -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>

src/SharpEmu.CLI/packages.lock.json

@@ -0,0 +1,588 @@
+{
+  "version": 2,
+  "dependencies": {
+    "net10.0": {
+      "Microsoft.NET.ILLink.Tasks": {
+        "type": "Direct",
+        "requested": "[10.0.3, )",
+        "resolved": "10.0.3",
+        "contentHash": "0B6nZyCHWXnvmlB559oduOspVdNOnpNXPjhpWVMovLPAsDVG7A4jJR9rzECf67JUzxP8/ee/wA8clwIzJcWNFA=="
+      },
+      "Avalonia.Angle.Windows.Natives": {
+        "type": "Transitive",
+        "resolved": "2.1.25547.20250602",
+        "contentHash": "ZL0VLc4s9rvNNFt19Pxm5UNAkmKNylugAwJPX9ulXZ6JWs/l6XZihPWWTyezaoNOVyEPU8YbURtW7XMAtqXH5A=="
+      },
+      "Avalonia.BuildServices": {
+        "type": "Transitive",
+        "resolved": "11.3.2",
+        "contentHash": "qHDToxto1e3hci5YqbG9n0Ty8mlp3zBUN5wT66wKqaDVzXyQ0do3EnRILd4Ke9jpvsktaPpgE0YjEk7hornryQ=="
+      },
+      "Avalonia.FreeDesktop": {
+        "type": "Transitive",
+        "resolved": "11.3.18",
+        "contentHash": "aUwv8BNruRUOaUfMu4U3uibIUS60/rSHgGOhd8zBkLkpxY3JFJvgRbeq5ZzHIyKXCuKi18PO00YHAgCarp3wdw==",
+        "dependencies": {
+          "Avalonia": "11.3.18",
+          "Tmds.DBus.Protocol": "0.21.3"
+        }
+      },
+      "Avalonia.Native": {
+        "type": "Transitive",
+        "resolved": "11.3.18",
+        "contentHash": "8g53DROFW6wVJAnTsE1Iu5bdZO5r0oqxbdbMQODs1QDYCK2IU/y/x/vQVKCYOvqxl4tXkzU9tExv8XqSGPWthQ==",
+        "dependencies": {
+          "Avalonia": "11.3.18"
+        }
+      },
+      "Avalonia.Remote.Protocol": {
+        "type": "Transitive",
+        "resolved": "11.3.18",
+        "contentHash": "vw+6ZfgTuu72dA9aVWn6u56t2nrBd5MoMU0wo/qI9XJAl/c0oYYphIvwLvJP1JorubQY4UE3d0ac8ULBhrGBiA=="
+      },
+      "Avalonia.Skia": {
+        "type": "Transitive",
+        "resolved": "11.3.18",
+        "contentHash": "/B4aXmNRNjG8I5U/a1xJI+bIi0XO6DDzS3mBrIKlVnJRY2CyZiUeESRQXLnIU77Z9TvqkUROs+D47s085YjFtA==",
+        "dependencies": {
+          "Avalonia": "11.3.18",
+          "HarfBuzzSharp": "8.3.1.1",
+          "HarfBuzzSharp.NativeAssets.Linux": "8.3.1.1",
+          "HarfBuzzSharp.NativeAssets.WebAssembly": "8.3.1.1",
+          "SkiaSharp": "2.88.9",
+          "SkiaSharp.NativeAssets.Linux": "2.88.9",
+          "SkiaSharp.NativeAssets.WebAssembly": "2.88.9"
+        }
+      },
+      "Avalonia.Win32": {
+        "type": "Transitive",
+        "resolved": "11.3.18",
+        "contentHash": "eioUHkM2PeLPETd1aEks3rvb9plbba6buIrNdrqCpwE/qgHKUjvRNBd5mUQfAbGgTLiAes524gB8uUMDhrsJVQ==",
+        "dependencies": {
+          "Avalonia": "11.3.18",
+          "Avalonia.Angle.Windows.Natives": "2.1.25547.20250602"
+        }
+      },
+      "Avalonia.X11": {
+        "type": "Transitive",
+        "resolved": "11.3.18",
+        "contentHash": "m4Ki/G5Dovnq+6QzfS0iGbK8V77Q6oTjToMLOB0CxPCCrl3Oxywh6kIjuGJDPaN6kopMmjxlNShyQf+vPYL+JA==",
+        "dependencies": {
+          "Avalonia": "11.3.18",
+          "Avalonia.FreeDesktop": "11.3.18",
+          "Avalonia.Skia": "11.3.18"
+        }
+      },
+      "HarfBuzzSharp": {
+        "type": "Transitive",
+        "resolved": "8.3.1.1",
+        "contentHash": "tLZN66oe/uiRPTZfrCU4i8ScVGwqHNh5MHrXj0yVf4l7Mz0FhTGnQ71RGySROTmdognAs0JtluHkL41pIabWuQ==",
+        "dependencies": {
+          "HarfBuzzSharp.NativeAssets.Win32": "8.3.1.1",
+          "HarfBuzzSharp.NativeAssets.macOS": "8.3.1.1"
+        }
+      },
+      "HarfBuzzSharp.NativeAssets.Linux": {
+        "type": "Transitive",
+        "resolved": "8.3.1.1",
+        "contentHash": "3EZ1mpIiKWRLL5hUYA82ZHteeDIVaEA/Z0rA/wU6tjx6crcAkJnBPwDXZugBSfo8+J3EznvRJf49uMsqYfKrHg=="
+      },
+      "HarfBuzzSharp.NativeAssets.macOS": {
+        "type": "Transitive",
+        "resolved": "8.3.1.1",
+        "contentHash": "jbtCsgftcaFLCA13tVKo5iWdElJScrulLTKJre36O4YQTIlwDtPPqhRZNk+Y0vv4D1gxbscasGRucUDfS44ofQ=="
+      },
+      "HarfBuzzSharp.NativeAssets.WebAssembly": {
+        "type": "Transitive",
+        "resolved": "8.3.1.1",
+        "contentHash": "loJweK2u/mH/3C2zBa0ggJlITIszOkK64HLAZB7FUT670dTg965whLFYHDQo69NmC4+d9UN0icLC9VHidXaVCA=="
+      },
+      "HarfBuzzSharp.NativeAssets.Win32": {
+        "type": "Transitive",
+        "resolved": "8.3.1.1",
+        "contentHash": "UsJtQsfAJoFDZrXc4hCUfRPMqccfKZ0iumJ/upcUjz/cmsTgVFGNEL5yaJWmkqsuFYdMWbj/En5/kS4PFl9hBA=="
+      },
+      "MicroCom.Runtime": {
+        "type": "Transitive",
+        "resolved": "0.11.0",
+        "contentHash": "MEnrZ3UIiH40hjzMDsxrTyi8dtqB5ziv3iBeeU4bXsL/7NLSal9F1lZKpK+tfBRnUoDSdtcW3KufE4yhATOMCA=="
+      },
+      "Microsoft.DotNet.PlatformAbstractions": {
+        "type": "Transitive",
+        "resolved": "3.1.6",
+        "contentHash": "jek4XYaQ/PGUwDKKhwR8K47Uh1189PFzMeLqO83mXrXQVIpARZCcfuDedH50YDTepBkfijCZN5U/vZi++erxtg=="
+      },
+      "Microsoft.Extensions.DependencyModel": {
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+        "type": "Transitive",
+        "resolved": "2.88.9",
+        "contentHash": "wb2kYgU7iy84nQLYZwMeJXixvK++GoIuECjU4ECaUKNuflyRlJKyiRhN1MAHswvlvzuvkrjRWlK0Za6+kYQK7w=="
+      },
+      "Ultz.Native.GLFW": {
+        "type": "Transitive",
+        "resolved": "3.4.0",
+        "contentHash": "Iy22JopynbOJ32vA0lBhFEzGi65GQJBuJHYBYRBpydrDpNoTiHnjIXfA65Gu+8qsOr/ZEoIF8r9aHCgAXuO6DA=="
+      }
+    },
+    "net10.0/win-x64": {
+      "Avalonia.Angle.Windows.Natives": {
+        "type": "Transitive",
+        "resolved": "2.1.25547.20250602",
+        "contentHash": "ZL0VLc4s9rvNNFt19Pxm5UNAkmKNylugAwJPX9ulXZ6JWs/l6XZihPWWTyezaoNOVyEPU8YbURtW7XMAtqXH5A=="
+      },
+      "Avalonia.Native": {
+        "type": "Transitive",
+        "resolved": "11.3.18",
+        "contentHash": "8g53DROFW6wVJAnTsE1Iu5bdZO5r0oqxbdbMQODs1QDYCK2IU/y/x/vQVKCYOvqxl4tXkzU9tExv8XqSGPWthQ==",
+        "dependencies": {
+          "Avalonia": "11.3.18"
+        }
+      },
+      "HarfBuzzSharp.NativeAssets.Linux": {
+        "type": "Transitive",
+        "resolved": "8.3.1.1",
+        "contentHash": "3EZ1mpIiKWRLL5hUYA82ZHteeDIVaEA/Z0rA/wU6tjx6crcAkJnBPwDXZugBSfo8+J3EznvRJf49uMsqYfKrHg=="
+      },
+      "HarfBuzzSharp.NativeAssets.macOS": {
+        "type": "Transitive",
+        "resolved": "8.3.1.1",
+        "contentHash": "jbtCsgftcaFLCA13tVKo5iWdElJScrulLTKJre36O4YQTIlwDtPPqhRZNk+Y0vv4D1gxbscasGRucUDfS44ofQ=="
+      },
+      "HarfBuzzSharp.NativeAssets.Win32": {
+        "type": "Transitive",
+        "resolved": "8.3.1.1",
+        "contentHash": "UsJtQsfAJoFDZrXc4hCUfRPMqccfKZ0iumJ/upcUjz/cmsTgVFGNEL5yaJWmkqsuFYdMWbj/En5/kS4PFl9hBA=="
+      },
+      "SkiaSharp.NativeAssets.Linux": {
+        "type": "Transitive",
+        "resolved": "2.88.9",
+        "contentHash": "cWSaJKVPWAaT/WIn9c8T5uT/l4ETwHxNJTkEOtNKjphNo8AW6TF9O32aRkxqw3l8GUdUo66Bu7EiqtFh/XG0Zg==",
+        "dependencies": {
+          "SkiaSharp": "2.88.9"
+        }
+      },
+      "SkiaSharp.NativeAssets.macOS": {
+        "type": "Transitive",
+        "resolved": "2.88.9",
+        "contentHash": "Nv5spmKc4505Ep7oUoJ5vp3KweFpeNqxpyGDWyeEPTX2uR6S6syXIm3gj75dM0YJz7NPvcix48mR5laqs8dPuA=="
+      },
+      "SkiaSharp.NativeAssets.Win32": {
+        "type": "Transitive",
+        "resolved": "2.88.9",
+        "contentHash": "wb2kYgU7iy84nQLYZwMeJXixvK++GoIuECjU4ECaUKNuflyRlJKyiRhN1MAHswvlvzuvkrjRWlK0Za6+kYQK7w=="
+      },
+      "Ultz.Native.GLFW": {
+        "type": "Transitive",
+        "resolved": "3.4.0",
+        "contentHash": "Iy22JopynbOJ32vA0lBhFEzGi65GQJBuJHYBYRBpydrDpNoTiHnjIXfA65Gu+8qsOr/ZEoIF8r9aHCgAXuO6DA=="
+      }
+    }
+  }
+}

src/SharpEmu.Core/Cpu/CpuDispatcher.cs

@@ -7,15 +7,11 @@ using SharpEmu.Core.Cpu.Native;
 using SharpEmu.Core.Loader;
 using SharpEmu.Core.Memory;
 using SharpEmu.HLE;
-using SharpEmu.HLE.Host;
-using SharpEmu.Logging;
 
 namespace SharpEmu.Core.Cpu;
 
 public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
 {
-    private static readonly SharpEmuLogger Log = SharpEmuLog.For("Dispatcher");
-
     private enum EntryFrameKind
     {
         ProcessEntry,
@@ -31,9 +27,9 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
     private static readonly ulong TlsBaseAddress = OperatingSystem.IsWindows() ? 0x7FFE_0000_0000UL : 0x6FFE_0000_0000UL;
     private const ulong TlsSize = 0x0001_0000UL;
     // The static TLS blocks live at negative offsets from the TCB (FreeBSD
-    // amd64 variant II); libc.prx alone reaches beyond -0x1700, so give the
-    // prefix a full 64KB on POSIX. Windows keeps its historical 4KB prefix.
-    private static readonly ulong TlsPrefixSize = OperatingSystem.IsWindows() ? 0x0000_1000UL : 0x0001_0000UL;
+    // amd64 variant II). Keep every host in sync with GuestTlsTemplate's
+    // startup reservation; PS5 modules routinely reach beyond one host page.
+    private const ulong TlsPrefixSize = GuestTlsTemplate.StartupStaticTlsReservation;
     private static readonly ulong BootstrapStubBaseAddress = OperatingSystem.IsWindows() ? 0x7FFD_F000_0000UL : 0x6FFD_F000_0000UL;
     private static readonly ulong BootstrapPayloadBaseAddress = OperatingSystem.IsWindows() ? 0x7FFD_E000_0000UL : 0x6FFD_E000_0000UL;
     private static readonly ulong DynlibFallbackStubBaseAddress = OperatingSystem.IsWindows() ? 0x7FFD_D000_0000UL : 0x6FFD_D000_0000UL;
@@ -49,19 +45,16 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
     ];
     private readonly IVirtualMemory _virtualMemory;
     private readonly IModuleManager _moduleManager;
-    private readonly IHostPlatform? _hostPlatform;
     private INativeCpuBackend? _nativeCpuBackend;
 
     public CpuDispatcher(
         IVirtualMemory virtualMemory,
         IModuleManager moduleManager,
-        INativeCpuBackend? nativeCpuBackend = null,
-        IHostPlatform? hostPlatform = null)
+        INativeCpuBackend? nativeCpuBackend = null)
     {
         _virtualMemory = virtualMemory ?? throw new ArgumentNullException(nameof(virtualMemory));
         _moduleManager = moduleManager ?? throw new ArgumentNullException(nameof(moduleManager));
         _nativeCpuBackend = nativeCpuBackend;
-        _hostPlatform = hostPlatform;
     }
 
     public ulong? LastEntryPoint { get; private set; }
@@ -94,8 +87,8 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
         string processImageName = "eboot.bin",
         CpuExecutionOptions executionOptions = default)
     {
-        Log.Debug("=== DispatchEntry START ===");
-        Log.Debug($"entryPoint=0x{entryPoint:X16}, generation={generation}");
+        Console.Error.WriteLine("[DISPATCHER] === DispatchEntry START ===");
+        Console.Error.WriteLine($"[DISPATCHER] entryPoint=0x{entryPoint:X16}, generation={generation}");
 
         try
         {
@@ -103,7 +96,8 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
         }
         catch (Exception ex)
         {
-            Log.Critical($"FATAL EXCEPTION in DispatchEntry: {ex.GetType().Name}: {ex.Message}", ex);
+            Console.Error.WriteLine($"[DISPATCHER] FATAL EXCEPTION in DispatchEntry: {ex.GetType().Name}: {ex.Message}");
+            Console.Error.WriteLine($"[DISPATCHER] Stack trace: {ex.StackTrace}");
             throw;
         }
     }
@@ -116,8 +110,8 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
         string moduleName = "module",
         CpuExecutionOptions executionOptions = default)
     {
-        Log.Debug("=== DispatchModuleInitializer START ===");
-        Log.Debug($"moduleInit=0x{entryPoint:X16}, generation={generation}, module={moduleName}");
+        Console.Error.WriteLine("[DISPATCHER] === DispatchModuleInitializer START ===");
+        Console.Error.WriteLine($"[DISPATCHER] moduleInit=0x{entryPoint:X16}, generation={generation}, module={moduleName}");
 
         try
         {
@@ -132,7 +126,8 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
         }
         catch (Exception ex)
         {
-            Log.Critical($"FATAL EXCEPTION in DispatchModuleInitializer: {ex.GetType().Name}: {ex.Message}", ex);
+            Console.Error.WriteLine($"[DISPATCHER] FATAL EXCEPTION in DispatchModuleInitializer: {ex.GetType().Name}: {ex.Message}");
+            Console.Error.WriteLine($"[DISPATCHER] Stack trace: {ex.StackTrace}");
             throw;
         }
     }
@@ -146,7 +141,7 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
         CpuExecutionOptions executionOptions = default,
         EntryFrameKind frameKind = EntryFrameKind.ProcessEntry)
     {
-        Log.Debug("DispatchEntryCore STARTING...");
+        Console.Error.WriteLine("[DISPATCHER] DispatchEntryCore STARTING...");
 
         LastEntryPoint = entryPoint;
         LastTrapInfo = null;
@@ -277,7 +272,7 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
             entryFrameDiagnostic,
             Environment.NewLine,
             "CpuEngine: native-only");
-        _nativeCpuBackend ??= new DirectExecutionBackend(_moduleManager, _hostPlatform);
+        _nativeCpuBackend ??= new DirectExecutionBackend(_moduleManager);
         if (_nativeCpuBackend.TryExecute(
                 context,
                 entryPoint,
@@ -318,7 +313,7 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
             LastMilestoneLog,
             Environment.NewLine,
             $"CpuEngine native-only failed: {backendError}");
-        Log.Error($"Native backend FAILED: {backendError}");
+        Console.Error.WriteLine($"[DISPATCHER] Native backend FAILED: {backendError}");
         return FailEarly(
             OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_IMPLEMENTED,
             CpuExitReason.NativeBackendUnavailable);
@@ -377,11 +372,19 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
 
     private static bool InitializeTls(CpuContext context, ulong tlsBase)
     {
-        return context.TryWriteUInt64(tlsBase - 0xF0, 0) &&
-               context.TryWriteUInt64(tlsBase + 0x00, tlsBase) &&
-               context.TryWriteUInt64(tlsBase + 0x10, tlsBase) &&
-               context.TryWriteUInt64(tlsBase + 0x28, 0xC0DEC0DECAFEBABEUL) &&
-               context.TryWriteUInt64(tlsBase + 0x60, tlsBase);
+        if (!context.TryWriteUInt64(tlsBase - 0xF0, 0) ||
+            !context.TryWriteUInt64(tlsBase + 0x00, tlsBase) ||
+            !context.TryWriteUInt64(tlsBase + 0x10, tlsBase) ||
+            !context.TryWriteUInt64(tlsBase + 0x28, 0xC0DEC0DECAFEBA00UL) ||
+            !context.TryWriteUInt64(tlsBase + 0x60, tlsBase))
+        {
+            return false;
+        }
+
+        // Seed the static TLS block below the thread pointer with the main
+        // module's initialized thread-locals (variant II layout).
+        SharpEmu.HLE.GuestTlsTemplate.SeedThreadBlock(context, tlsBase);
+        return true;
     }
 
     private static bool InitializeGuestFrameChainSentinel(CpuContext context)
@@ -407,35 +410,54 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
         ulong programExitHandlerAddress)
     {
         var imageName = string.IsNullOrWhiteSpace(processImageName) ? "eboot.bin" : processImageName;
-        var encodedNameLength = Encoding.UTF8.GetByteCount(imageName);
-        Span<byte> argv0Buffer = encodedNameLength + 1 <= 512
-            ? stackalloc byte[encodedNameLength + 1]
-            : new byte[encodedNameLength + 1];
-        if (Encoding.UTF8.GetBytes(imageName.AsSpan(), argv0Buffer) != encodedNameLength)
+        var arguments = new List<string>(3) { imageName };
+        var configuredArguments = Environment.GetEnvironmentVariable("SHARPEMU_GUEST_ARGS");
+        if (!string.IsNullOrWhiteSpace(configuredArguments))
         {
-            return false;
+            // The PS5 entry-parameter ABI exposes three inline argv pointers.
+            // Two compatibility arguments are therefore safe without changing
+            // the fixed 0x20-byte structure expected by existing titles.
+            var compatibilityArguments = configuredArguments.Split(
+                (char[]?)null,
+                StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+            arguments.AddRange(compatibilityArguments.Take(2));
         }
 
-        argv0Buffer[encodedNameLength] = 0;
         var cursor = context[CpuRegister.Rsp];
-
-        var argv0Address = AlignDown(cursor - (ulong)argv0Buffer.Length, 16);
-        if (!context.Memory.TryWrite(argv0Address, argv0Buffer))
+        var argumentAddresses = new ulong[arguments.Count];
+        for (var index = arguments.Count - 1; index >= 0; index--)
         {
-            return false;
+            var encoded = Encoding.UTF8.GetBytes(arguments[index] + '\0');
+            cursor = AlignDown(cursor - (ulong)encoded.Length, 16);
+            if (!context.Memory.TryWrite(cursor, encoded))
+            {
+                return false;
+            }
+
+            argumentAddresses[index] = cursor;
         }
 
         const ulong entryParamsSize = 0x20;
-        var entryParamsAddress = AlignDown(argv0Address - entryParamsSize, 16);
-        if (!context.TryWriteUInt32(entryParamsAddress + 0x00, 1) ||
-            !context.TryWriteUInt32(entryParamsAddress + 0x04, 0) ||
-            !context.TryWriteUInt64(entryParamsAddress + 0x08, argv0Address) ||
-            !context.TryWriteUInt64(entryParamsAddress + 0x10, 0) ||
-            !context.TryWriteUInt64(entryParamsAddress + 0x18, 0))
+        var entryParamsAddress = AlignDown(cursor - entryParamsSize, 16);
+        if (!TryWriteUInt32(context, entryParamsAddress + 0x00, (uint)arguments.Count) ||
+            !TryWriteUInt32(context, entryParamsAddress + 0x04, 0) ||
+            !context.TryWriteUInt64(entryParamsAddress + 0x08, argumentAddresses[0]) ||
+            !context.TryWriteUInt64(
+                entryParamsAddress + 0x10,
+                argumentAddresses.Length > 1 ? argumentAddresses[1] : 0) ||
+            !context.TryWriteUInt64(
+                entryParamsAddress + 0x18,
+                argumentAddresses.Length > 2 ? argumentAddresses[2] : 0))
         {
             return false;
         }
 
+        if (arguments.Count > 1)
+        {
+            Console.Error.WriteLine(
+                $"[DISPATCHER] Guest arguments: {string.Join(' ', arguments.Skip(1))}");
+        }
+
         var entryStackPointer = entryParamsAddress - sizeof(ulong);
         if (!context.TryWriteUInt64(entryStackPointer, 0))
         {
@@ -468,6 +490,13 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
         return value & ~(alignment - 1);
     }
 
+    private static bool TryWriteUInt32(CpuContext context, ulong address, uint value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(uint)];
+        BinaryPrimitives.WriteUInt32LittleEndian(buffer, value);
+        return context.Memory.TryWrite(address, buffer);
+    }
+
     private static string BuildEntryFrameDiagnostic(
         ulong entryPoint,
         CpuContext context,
@@ -664,6 +693,13 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
         return _virtualMemory.TryWrite(address, buffer);
     }
 
+    /// <summary>
+    /// True when the disposed native backend left its session state alive
+    /// because guest workers were still executing guest code. The guest
+    /// address space must then stay mapped as well.
+    /// </summary>
+    internal bool NativeSessionLeaked { get; private set; }
+
     public void Dispose()
     {
         if (_nativeCpuBackend is IDisposable disposableBackend)
@@ -671,6 +707,7 @@ public sealed class CpuDispatcher : ICpuDispatcher, IDisposable
             disposableBackend.Dispose();
         }
 
+        NativeSessionLeaked = _nativeCpuBackend is DirectExecutionBackend { GuestSessionLeaked: true };
         _nativeCpuBackend = null;
     }
 }

src/SharpEmu.Core/Cpu/Emulation/BmiInstructionEmulator.cs

@@ -0,0 +1,305 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Numerics;
+
+namespace SharpEmu.Core.Cpu.Emulation;
+
+/// <summary>
+/// Pure software implementations of the BMI1, BMI2 and ABM general-purpose-register
+/// bit-manipulation instructions.
+///
+/// The direct-execution backend runs guest PS5 code natively on the host CPU. The PS5's
+/// Zen 2 cores implement BMI1/BMI2/ABM, but a host CPU that predates those extensions raises
+/// #UD (STATUS_ILLEGAL_INSTRUCTION) when it meets one of these opcodes. This class provides the
+/// register-only arithmetic so the exception handler can finish the instruction in software and
+/// resume, instead of aborting the title.
+///
+/// The methods deliberately operate on plain integers rather than on the OS CONTEXT record so the
+/// semantics can be unit-tested in isolation; the unsafe register/memory plumbing lives in the
+/// backend adapter. Each method returns the result already masked to the operand width and, where
+/// the instruction is defined to touch flags, updates <paramref name="eflags"/> in place. Flags
+/// documented as "undefined" by the vendor manuals are left untouched so behaviour stays
+/// deterministic across hosts.
+/// </summary>
+public static class BmiInstructionEmulator
+{
+    private const uint FlagCarry = 1u << 0;
+    private const uint FlagZero = 1u << 6;
+    private const uint FlagSign = 1u << 7;
+    private const uint FlagOverflow = 1u << 11;
+
+    private static ulong WidthMask(GprOperandSize size) =>
+        size == GprOperandSize.Bits64 ? ulong.MaxValue : 0xFFFF_FFFFUL;
+
+    private static int WidthBits(GprOperandSize size) => (int)size;
+
+    private static bool SignSet(ulong value, GprOperandSize size) =>
+        size == GprOperandSize.Bits64 ? (value >> 63) != 0 : (value & 0x8000_0000UL) != 0;
+
+    private static uint WithFlag(uint eflags, uint flag, bool set) =>
+        set ? eflags | flag : eflags & ~flag;
+
+    // Applies the CF/ZF/SF/OF set shared by ANDN/BLS*/BZHI: OF is always cleared, ZF and SF follow
+    // the result, and the caller supplies CF because each instruction defines it differently.
+    private static uint ApplyLogicFlags(uint eflags, ulong result, GprOperandSize size, bool carry)
+    {
+        eflags = WithFlag(eflags, FlagCarry, carry);
+        eflags = WithFlag(eflags, FlagZero, result == 0);
+        eflags = WithFlag(eflags, FlagSign, SignSet(result, size));
+        eflags = WithFlag(eflags, FlagOverflow, false);
+        return eflags;
+    }
+
+    /// <summary>ANDN: <c>dest = (~src1) &amp; src2</c>. CF and OF are cleared.</summary>
+    public static ulong Andn(ulong src1, ulong src2, GprOperandSize size, ref uint eflags)
+    {
+        var result = (~src1 & src2) & WidthMask(size);
+        eflags = ApplyLogicFlags(eflags, result, size, carry: false);
+        return result;
+    }
+
+    /// <summary>BLSI: isolate the lowest set bit, <c>dest = (-src) &amp; src</c>. CF = (src != 0).</summary>
+    public static ulong Blsi(ulong src, GprOperandSize size, ref uint eflags)
+    {
+        var mask = WidthMask(size);
+        var s = src & mask;
+        var result = ((0UL - s) & s) & mask;
+        eflags = ApplyLogicFlags(eflags, result, size, carry: s != 0);
+        return result;
+    }
+
+    /// <summary>BLSMSK: mask up to and including the lowest set bit, <c>dest = (src - 1) ^ src</c>. CF = (src == 0).</summary>
+    public static ulong Blsmsk(ulong src, GprOperandSize size, ref uint eflags)
+    {
+        var mask = WidthMask(size);
+        var s = src & mask;
+        var result = ((s - 1) ^ s) & mask;
+        eflags = ApplyLogicFlags(eflags, result, size, carry: s == 0);
+        return result;
+    }
+
+    /// <summary>BLSR: reset the lowest set bit, <c>dest = (src - 1) &amp; src</c>. CF = (src == 0).</summary>
+    public static ulong Blsr(ulong src, GprOperandSize size, ref uint eflags)
+    {
+        var mask = WidthMask(size);
+        var s = src & mask;
+        var result = ((s - 1) & s) & mask;
+        eflags = ApplyLogicFlags(eflags, result, size, carry: s == 0);
+        return result;
+    }
+
+    /// <summary>
+    /// BEXTR: extract <c>len</c> bits of <paramref name="src"/> starting at bit <c>start</c>, where
+    /// start = control[7:0] and len = control[15:8]. Only ZF (per result) and cleared CF/OF are defined.
+    /// </summary>
+    public static ulong Bextr(ulong src, ulong control, GprOperandSize size, ref uint eflags)
+    {
+        var bits = WidthBits(size);
+        var start = (int)(control & 0xFF);
+        var length = (int)((control >> 8) & 0xFF);
+
+        ulong result;
+        if (start >= bits)
+        {
+            result = 0;
+        }
+        else
+        {
+            var shifted = (src & WidthMask(size)) >> start;
+            if (length == 0)
+            {
+                result = 0;
+            }
+            else if (length >= bits)
+            {
+                result = shifted;
+            }
+            else
+            {
+                result = shifted & ((1UL << length) - 1);
+            }
+        }
+
+        result &= WidthMask(size);
+        eflags = WithFlag(eflags, FlagZero, result == 0);
+        eflags = WithFlag(eflags, FlagCarry, false);
+        eflags = WithFlag(eflags, FlagOverflow, false);
+        return result;
+    }
+
+    /// <summary>
+    /// BZHI: zero the bits of <paramref name="src"/> from bit position <c>index[7:0]</c> upward.
+    /// CF is set when the requested position is at or beyond the operand width.
+    /// </summary>
+    public static ulong Bzhi(ulong src, ulong index, GprOperandSize size, ref uint eflags)
+    {
+        var bits = WidthBits(size);
+        var mask = WidthMask(size);
+        var s = src & mask;
+        var n = (int)(index & 0xFF);
+
+        ulong result;
+        bool carry;
+        if (n >= bits)
+        {
+            result = s;
+            carry = true;
+        }
+        else
+        {
+            result = s & ((1UL << n) - 1);
+            carry = false;
+        }
+
+        eflags = ApplyLogicFlags(eflags, result, size, carry);
+        return result;
+    }
+
+    /// <summary>TZCNT: count trailing zero bits. If src == 0 the result is the operand width and CF is set.</summary>
+    public static ulong Tzcnt(ulong src, GprOperandSize size, ref uint eflags)
+    {
+        var bits = WidthBits(size);
+        var s = src & WidthMask(size);
+
+        ulong result;
+        bool carry;
+        if (s == 0)
+        {
+            result = (ulong)bits;
+            carry = true;
+        }
+        else
+        {
+            result = (ulong)(size == GprOperandSize.Bits64
+                ? BitOperations.TrailingZeroCount(s)
+                : BitOperations.TrailingZeroCount((uint)s));
+            carry = false;
+        }
+
+        eflags = WithFlag(eflags, FlagCarry, carry);
+        eflags = WithFlag(eflags, FlagZero, result == 0);
+        return result;
+    }
+
+    /// <summary>LZCNT: count leading zero bits. If src == 0 the result is the operand width and CF is set.</summary>
+    public static ulong Lzcnt(ulong src, GprOperandSize size, ref uint eflags)
+    {
+        var bits = WidthBits(size);
+        var s = src & WidthMask(size);
+
+        ulong result;
+        bool carry;
+        if (s == 0)
+        {
+            result = (ulong)bits;
+            carry = true;
+        }
+        else
+        {
+            result = (ulong)(size == GprOperandSize.Bits64
+                ? BitOperations.LeadingZeroCount(s)
+                : BitOperations.LeadingZeroCount((uint)s));
+            carry = false;
+        }
+
+        eflags = WithFlag(eflags, FlagCarry, carry);
+        eflags = WithFlag(eflags, FlagZero, result == 0);
+        return result;
+    }
+
+    /// <summary>RORX: rotate <paramref name="src"/> right by <paramref name="count"/> (masked to the operand width). No flags.</summary>
+    public static ulong Rorx(ulong src, int count, GprOperandSize size)
+    {
+        var bits = WidthBits(size);
+        var mask = WidthMask(size);
+        var s = src & mask;
+        var rotate = count & (bits - 1);
+        if (rotate == 0)
+        {
+            return s;
+        }
+
+        return ((s >> rotate) | (s << (bits - rotate))) & mask;
+    }
+
+    /// <summary>SARX: arithmetic shift right by <paramref name="count"/> (masked to the operand width). No flags.</summary>
+    public static ulong Sarx(ulong src, int count, GprOperandSize size)
+    {
+        var bits = WidthBits(size);
+        var mask = WidthMask(size);
+        var shift = count & (bits - 1);
+        if (size == GprOperandSize.Bits64)
+        {
+            return (ulong)((long)src >> shift);
+        }
+
+        return (ulong)(uint)((int)(uint)src >> shift) & mask;
+    }
+
+    /// <summary>SHLX: logical shift left by <paramref name="count"/> (masked to the operand width). No flags.</summary>
+    public static ulong Shlx(ulong src, int count, GprOperandSize size)
+    {
+        var bits = WidthBits(size);
+        var mask = WidthMask(size);
+        var shift = count & (bits - 1);
+        return (src << shift) & mask;
+    }
+
+    /// <summary>SHRX: logical shift right by <paramref name="count"/> (masked to the operand width). No flags.</summary>
+    public static ulong Shrx(ulong src, int count, GprOperandSize size)
+    {
+        var bits = WidthBits(size);
+        var mask = WidthMask(size);
+        var s = src & mask;
+        var shift = count & (bits - 1);
+        return s >> shift;
+    }
+
+    /// <summary>PDEP: deposit contiguous low bits of <paramref name="src"/> into the positions selected by <paramref name="mask"/>. No flags.</summary>
+    public static ulong Pdep(ulong src, ulong mask, GprOperandSize size)
+    {
+        var bits = WidthBits(size);
+        var selector = mask & WidthMask(size);
+        ulong result = 0;
+        var bit = 0;
+        for (var i = 0; i < bits; i++)
+        {
+            var position = 1UL << i;
+            if ((selector & position) != 0)
+            {
+                if (((src >> bit) & 1UL) != 0)
+                {
+                    result |= position;
+                }
+
+                bit++;
+            }
+        }
+
+        return result & WidthMask(size);
+    }
+
+    /// <summary>PEXT: gather the bits of <paramref name="src"/> selected by <paramref name="mask"/> into contiguous low bits. No flags.</summary>
+    public static ulong Pext(ulong src, ulong mask, GprOperandSize size)
+    {
+        var bits = WidthBits(size);
+        var selector = mask & WidthMask(size);
+        ulong result = 0;
+        var bit = 0;
+        for (var i = 0; i < bits; i++)
+        {
+            if ((selector & (1UL << i)) != 0)
+            {
+                if (((src >> i) & 1UL) != 0)
+                {
+                    result |= 1UL << bit;
+                }
+
+                bit++;
+            }
+        }
+
+        return result & WidthMask(size);
+    }
+}

src/SharpEmu.Core/Cpu/Emulation/GprOperandSize.cs

@@ -0,0 +1,14 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+namespace SharpEmu.Core.Cpu.Emulation;
+
+/// <summary>
+/// Operand width for the emulated general-purpose-register instructions. The numeric value is the
+/// bit width, so it can double as the "count leading/trailing zeros of an all-zero source" result.
+/// </summary>
+public enum GprOperandSize
+{
+    Bits32 = 32,
+    Bits64 = 64,
+}

src/SharpEmu.Core/Cpu/Native/DirectExecutionBackend.Diagnostics.cs

@@ -7,8 +7,8 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.InteropServices;
 using System.Threading;
+using SharpEmu.Core.Cpu.Disasm;
 using SharpEmu.HLE;
-using SharpEmu.HLE.Host;
 using SharpEmu.Logging;
 
 namespace SharpEmu.Core.Cpu.Native;
@@ -17,6 +17,55 @@ public sealed partial class DirectExecutionBackend
 {
 	private static readonly ConcurrentDictionary<ulong, byte> _knownExecutablePages = new();
 
+	private static readonly bool _perfHleHistogram =
+		string.Equals(System.Environment.GetEnvironmentVariable("SHARPEMU_PERF_HLE"), "1", System.StringComparison.Ordinal);
+	private static readonly System.Collections.Concurrent.ConcurrentDictionary<string, long> _perfHleCounts = new();
+	private static long _perfHleTotal;
+	private static long _perfHleDispatchTicks;
+
+	private static void RecordPerfHleDispatchTime(long ticks)
+	{
+		var total = System.Threading.Interlocked.Add(ref _perfHleDispatchTicks, ticks);
+		var calls = System.Threading.Interlocked.Read(ref _perfHleTotal);
+		if (calls > 0 && calls % 500000 == 0)
+		{
+			var avgUs = (double)total / System.Diagnostics.Stopwatch.Frequency * 1_000_000.0 / calls;
+			System.Console.Error.WriteLine($"[PERF][HLE] managed_dispatch_avg={avgUs:F3}us total_managed_s={(double)total / System.Diagnostics.Stopwatch.Frequency:F2}");
+		}
+	}
+
+	private static readonly bool _perfHleNoDict =
+		string.Equals(System.Environment.GetEnvironmentVariable("SHARPEMU_PERF_HLE_NODICT"), "1", System.StringComparison.Ordinal);
+
+	private static void RecordPerfHleCall(string name)
+	{
+		var total = System.Threading.Interlocked.Increment(ref _perfHleTotal);
+		if (!_perfHleNoDict)
+		{
+			_perfHleCounts.AddOrUpdate(name, 1, static (_, v) => v + 1);
+		}
+
+		if (total % 500000 == 0 && !_perfHleNoDict)
+		{
+			// Snapshot via foreach (a safe moving enumerator) before sorting.
+			// LINQ over a ConcurrentDictionary uses ICollection.CopyTo, which
+			// throws ArgumentException if another thread adds a key between the
+			// Count read and the copy — that exception was being swallowed into
+			// a CPU_TRAP return and crashing the guest.
+			var snapshot = new System.Collections.Generic.List<System.Collections.Generic.KeyValuePair<string, long>>(_perfHleCounts.Count + 16);
+			foreach (var kvp in _perfHleCounts)
+			{
+				snapshot.Add(kvp);
+			}
+
+			var top = snapshot
+				.OrderByDescending(kvp => kvp.Value)
+				.Take(20)
+				.Select(kvp => $"{kvp.Key}={kvp.Value}");
+			System.Console.Error.WriteLine($"[PERF][HLE] total={total} top: {string.Join(", ", top)}");
+		}
+	}
+
 	private void RecordRecentImportTrace(
 		long dispatchIndex,
 		string nid,
@@ -25,101 +74,40 @@ public sealed partial class DirectExecutionBackend
 		ulong arg1,
 		ulong arg2)
 	{
-		_recentImportTrace[_recentImportTraceWriteIndex] = new RecentImportTraceEntry(
+		var trace = _recentImportTrace;
+		trace[_recentImportTraceWriteIndex] = new RecentImportTraceEntry(
 			dispatchIndex,
 			nid,
 			returnRip,
 			arg0,
 			arg1,
-			arg2);
-		_recentImportTraceWriteIndex = (_recentImportTraceWriteIndex + 1) % _recentImportTrace.Length;
-		if (_recentImportTraceCount < _recentImportTrace.Length)
+			arg2,
+			GuestThreadExecution.CurrentGuestThreadHandle,
+			Environment.CurrentManagedThreadId);
+		_recentImportTraceWriteIndex = (_recentImportTraceWriteIndex + 1) % trace.Length;
+		if (_recentImportTraceCount < trace.Length)
 		{
 			_recentImportTraceCount++;
 		}
 	}
 
-	private void RecordDeferredBootstrapTrace(
-		long dispatchIndex,
-		ulong op,
-		ulong symbolPointer,
-		ulong outputPointer,
-		ulong returnRip)
-	{
-		lock (_deferredBootstrapTraceGate)
-		{
-			_deferredBootstrapTrace[_deferredBootstrapTraceWriteIndex] = new DeferredBootstrapTraceEntry(
-				dispatchIndex,
-				op,
-				symbolPointer,
-				outputPointer,
-				returnRip);
-			_deferredBootstrapTraceWriteIndex =
-				(_deferredBootstrapTraceWriteIndex + 1) % _deferredBootstrapTrace.Length;
-			if (_deferredBootstrapTraceCount < _deferredBootstrapTrace.Length)
-			{
-				_deferredBootstrapTraceCount++;
-			}
-		}
-	}
-
-	private void DrainDeferredBootstrapTraces()
-	{
-		if (!_logBootstrap)
-		{
-			return;
-		}
-
-		DeferredBootstrapTraceEntry[] pending;
-		lock (_deferredBootstrapTraceGate)
-		{
-			if (_deferredBootstrapTraceCount == 0)
-			{
-				return;
-			}
-
-			pending = new DeferredBootstrapTraceEntry[_deferredBootstrapTraceCount];
-			var readIndex = (_deferredBootstrapTraceWriteIndex - _deferredBootstrapTraceCount +
-				_deferredBootstrapTrace.Length) % _deferredBootstrapTrace.Length;
-			for (var i = 0; i < _deferredBootstrapTraceCount; i++)
-			{
-				pending[i] = _deferredBootstrapTrace[(readIndex + i) % _deferredBootstrapTrace.Length];
-			}
-
-			_deferredBootstrapTraceCount = 0;
-		}
-
-		foreach (var entry in pending)
-		{
-			var symbolText = "<unreadable>";
-			if (TryReadAsciiZ(entry.SymbolPointer, 256, out var sym))
-			{
-				symbolText = sym;
-			}
-
-			Console.Error.WriteLine(
-				$"[LOADER][TRACE] bootstrap_call#{entry.DispatchIndex}: op=0x{entry.Op:X16} " +
-				$"sym_ptr=0x{entry.SymbolPointer:X16} sym='{symbolText}' " +
-				$"out_ptr=0x{entry.OutputPointer:X16} ret=0x{entry.ReturnRip:X16}");
-		}
-	}
-
 	private void DumpRecentImportTrace()
 	{
-		if (_recentImportTraceCount == 0)
+		var trace = _recentImportTrace;
+		if (trace is null || _recentImportTraceCount == 0)
 		{
 			return;
 		}
-		Log.Info($"   Recent import calls ({_recentImportTraceCount}):");
-		int num = (_recentImportTraceWriteIndex - _recentImportTraceCount + _recentImportTrace.Length) % _recentImportTrace.Length;
+		Log.Info($"   Recent import calls for managed={Environment.CurrentManagedThreadId} guest=0x{GuestThreadExecution.CurrentGuestThreadHandle:X16} ({_recentImportTraceCount}):");
+		int num = (_recentImportTraceWriteIndex - _recentImportTraceCount + trace.Length) % trace.Length;
 		for (int i = 0; i < _recentImportTraceCount; i++)
 		{
-			int num2 = (num + i) % _recentImportTrace.Length;
-			var entry = _recentImportTrace[num2];
+			int num2 = (num + i) % trace.Length;
+			var entry = trace[num2];
 			if (!string.IsNullOrEmpty(entry.Nid))
 			{
 				Log.Info(
-					$"     #{entry.DispatchIndex} nid={entry.Nid} ret=0x{entry.ReturnRip:X16} " +
+					$"     #{entry.DispatchIndex} managed={entry.ManagedThreadId} guest=0x{entry.GuestThreadHandle:X16} nid={entry.Nid} ret=0x{entry.ReturnRip:X16} " +
 					$"rdi=0x{entry.Arg0:X16} rsi=0x{entry.Arg1:X16} rdx=0x{entry.Arg2:X16}");
 			}
 		}
@@ -135,9 +123,8 @@ public sealed partial class DirectExecutionBackend
 		int num2 = 0;
 		List<ulong> list = new List<ulong>(16);
 		ulong num3 = scanStart;
-		var hostMemory = ResolveDiagnosticsHostMemory();
-		HostRegionInfo lpBuffer;
-		while (num3 < scanEnd && hostMemory.Query(num3, out lpBuffer))
+		MEMORY_BASIC_INFORMATION64 lpBuffer;
+		while (num3 < scanEnd && VirtualQuery((void*)num3, out lpBuffer, (nuint)sizeof(MEMORY_BASIC_INFORMATION64)) != 0)
 		{
 			ulong baseAddress = lpBuffer.BaseAddress;
 			ulong num4 = baseAddress + lpBuffer.RegionSize;
@@ -147,7 +134,7 @@ public sealed partial class DirectExecutionBackend
 			}
 			ulong value = Math.Max(num3, baseAddress);
 			ulong num5 = Math.Min(num4, scanEnd);
-			if (lpBuffer.State == HostRegionState.Committed && IsReadableProtection(lpBuffer.RawProtection) && !IsExecutableProtection(lpBuffer.RawProtection))
+			if (lpBuffer.State == 4096 && IsReadableProtection(lpBuffer.Protect) && !IsExecutableProtection(lpBuffer.Protect))
 			{
 				ulong num6 = AlignUp(value, 8uL);
 				for (ulong num7 = num6; num7 + 8 <= num5; num7 += 8)
@@ -186,6 +173,50 @@ public sealed partial class DirectExecutionBackend
 		{
 			return;
 		}
+		const int preludeSize = 192;
+		Span<byte> prelude = stackalloc byte[preludeSize];
+		if (returnRip >= preludeSize && cpuContext.Memory.TryRead(returnRip - preludeSize, prelude))
+		{
+			Console.Error.WriteLine(
+				$"[LOADER][TRACE] Import#{dispatchIndex} pre-return bytes @0x{returnRip - preludeSize:X16}: " +
+				BitConverter.ToString(prelude.ToArray()).Replace("-", " "));
+
+			List<DecodedInst>? bestCallChain = null;
+			var preludeAddress = returnRip - preludeSize;
+			for (var startOffset = 0; startOffset < preludeSize; startOffset++)
+			{
+				var cursor = preludeAddress + (ulong)startOffset;
+				var candidate = new List<DecodedInst>();
+				while (cursor < returnRip && candidate.Count < 96 &&
+					IcedDecoder.TryReadGuestBytes(cpuContext.Memory, cursor, 15, out var instructionBytes) &&
+					IcedDecoder.TryDecode(cursor, instructionBytes, out var instruction) &&
+					instruction.Length > 0 &&
+					cursor + (ulong)instruction.Length <= returnRip)
+				{
+					candidate.Add(instruction);
+					cursor += (ulong)instruction.Length;
+				}
+
+				if (cursor == returnRip &&
+					candidate.Count > 0 &&
+					string.Equals(candidate[^1].Mnemonic, "Call", StringComparison.OrdinalIgnoreCase) &&
+					(bestCallChain is null || candidate.Count > bestCallChain.Count))
+				{
+					bestCallChain = candidate;
+				}
+			}
+
+			if (bestCallChain is not null)
+			{
+				Console.Error.WriteLine($"[LOADER][TRACE] Import#{dispatchIndex} pre-return disassembly:");
+				foreach (var instruction in bestCallChain.TakeLast(32))
+				{
+					Console.Error.WriteLine(
+						$"[LOADER][TRACE]   0x{instruction.Rip:X16}: {instruction.Text} " +
+						$"bytes={IcedDecoder.FormatBytes(instruction.Bytes)}");
+				}
+			}
+		}
 		Span<byte> destination = stackalloc byte[128];
 		if (!cpuContext.Memory.TryRead(returnRip, destination))
 		{
@@ -237,15 +268,14 @@ public sealed partial class DirectExecutionBackend
 			ulong callRip = returnRip + (ulong)i;
 			ulong target = unchecked((ulong)((long)(callRip + 5) + rel32));
 			Log.Debug($"Import#{dispatchIndex} near-call @{callRip:X16}: target=0x{target:X16}");
-			var importEntries = _importEntries;
-			for (int importIndex = 0; importIndex < importEntries.Length; importIndex++)
+			for (int importIndex = 0; importIndex < _importEntries.Length; importIndex++)
 			{
-				if (importEntries[importIndex].Address != target)
+				if (_importEntries[importIndex].Address != target)
 				{
 					continue;
 				}
 
-				string nid = importEntries[importIndex].Nid;
+				string nid = _importEntries[importIndex].Nid;
 				if (_moduleManager.TryGetExport(nid, out var export))
 				{
 					Log.Debug(
@@ -272,14 +302,14 @@ public sealed partial class DirectExecutionBackend
 					{
 						Log.Debug(
 							$"Import#{dispatchIndex} near-call PLT slot: [0x{slot:X16}] = 0x{slotTarget:X16}");
-						for (int importIndex = 0; importIndex < importEntries.Length; importIndex++)
+						for (int importIndex = 0; importIndex < _importEntries.Length; importIndex++)
 						{
-							if (importEntries[importIndex].Address != slotTarget)
+							if (_importEntries[importIndex].Address != slotTarget)
 							{
 								continue;
 							}
 
-							string nid = importEntries[importIndex].Nid;
+							string nid = _importEntries[importIndex].Nid;
 							if (_moduleManager.TryGetExport(nid, out var export))
 							{
 								Log.Debug(
@@ -303,6 +333,28 @@ public sealed partial class DirectExecutionBackend
 		return value == 65534 || value == 4294967294u || value == 18446744073709551614uL;
 	}
 
+	private static ulong ParseOptionalHexAddress(string? value)
+	{
+		if (string.IsNullOrWhiteSpace(value))
+		{
+			return 0;
+		}
+
+		var text = value.Trim();
+		if (text.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
+		{
+			text = text[2..];
+		}
+
+		return ulong.TryParse(
+			text,
+			System.Globalization.NumberStyles.HexNumber,
+			System.Globalization.CultureInfo.InvariantCulture,
+			out var address)
+			? address
+			: 0;
+	}
+
 	private static bool IsPlausibleReturnAddress(ulong address)
 	{
 		return address >= 12884901888L && address < 17592186044416L && !IsUnresolvedSentinel(address);
@@ -352,7 +404,7 @@ public sealed partial class DirectExecutionBackend
 		{
 			return false;
 		}
-		if (!ResolveDiagnosticsHostMemory().Query(address, out var lpBuffer))
+		if (VirtualQuery((void*)address, out var lpBuffer, (nuint)sizeof(MEMORY_BASIC_INFORMATION64)) == 0)
 		{
 			return false;
 		}
@@ -361,7 +413,7 @@ public sealed partial class DirectExecutionBackend
 		{
 			return false;
 		}
-		if (lpBuffer.State != HostRegionState.Committed || !IsReadableProtection(lpBuffer.RawProtection))
+		if (lpBuffer.State != 4096 || !IsReadableProtection(lpBuffer.Protect))
 		{
 			return false;
 		}
@@ -393,12 +445,12 @@ public sealed partial class DirectExecutionBackend
 			return true;
 		}
 
-		if (!ResolveDiagnosticsHostMemory().Query(address, out var lpBuffer))
+		if (VirtualQuery((void*)address, out var lpBuffer, (nuint)sizeof(MEMORY_BASIC_INFORMATION64)) == 0)
 		{
 			return false;
 		}
 
-		var executable = lpBuffer.State == HostRegionState.Committed && IsExecutableProtection(lpBuffer.RawProtection);
+		var executable = lpBuffer.State == 4096 && IsExecutableProtection(lpBuffer.Protect);
 		if (executable)
 		{
 			_knownExecutablePages.TryAdd(pageAddress, 0);
@@ -417,14 +469,6 @@ public sealed partial class DirectExecutionBackend
 		return (value + num) & ~num;
 	}
 
-	// Diagnostics helpers are static (reachable from static handler paths), so
-	// they use the platform injected into the backend active on this thread and
-	// fall back to the process-wide singleton only when no run is bound.
-	private static IHostMemory ResolveDiagnosticsHostMemory()
-	{
-		return _activeExecutionBackend?._hostMemory ?? HostPlatform.Current.Memory;
-	}
-
 	private static bool IsReadableProtection(uint protect)
 	{
 		if ((protect & 0x100) != 0 || (protect & 1) != 0)

src/SharpEmu.Core/Cpu/Native/DirectExecutionBackend.Exceptions.cs

@@ -9,9 +9,7 @@ using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Threading;
 using SharpEmu.Core.Cpu.Disasm;
-using SharpEmu.Core.Cpu.Native.Windows;
 using SharpEmu.HLE;
-using SharpEmu.HLE.Host;
 
 namespace SharpEmu.Core.Cpu.Native;
 
@@ -19,6 +17,8 @@ public sealed partial class DirectExecutionBackend
 {
 	private const ulong LazyCommitWindowBytes = 0x0200_0000UL;
 	private static int _lazyCommitTraceCount;
+	private static int _guestAllocatorHoleRecoveries;
+	private static int _auxiliaryThreadExecuteFaultRecoveries;
 
 	private unsafe void SetupExceptionHandler()
 	{
@@ -30,12 +30,12 @@ public sealed partial class DirectExecutionBackend
 
 		if (!string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_DISABLE_RAW_HANDLER"), "1", StringComparison.Ordinal))
 		{
-			_rawExceptionHandlerStub = _faultHandling.CreateHandlerThunk(RawVectoredHandlerPtrManaged, _hostRspSlotTlsIndex, _tlsGetValueAddress);
+			_rawExceptionHandlerStub = CreateExceptionHandlerTrampoline(RawVectoredHandlerPtrManaged);
 			if (_rawExceptionHandlerStub == 0)
 			{
 				throw new InvalidOperationException("Failed to create raw exception handler trampoline");
 			}
-			_rawExceptionHandler = _faultHandling.AddFirstChanceHandler(_rawExceptionHandlerStub);
+			_rawExceptionHandler = (nint)AddVectoredExceptionHandler(1u, _rawExceptionHandlerStub);
 			Console.Error.WriteLine($"[LOADER][INFO] Raw exception handler installed: 0x{_rawExceptionHandler:X16}");
 		}
 		else
@@ -45,22 +45,22 @@ public sealed partial class DirectExecutionBackend
 
 		_handlerDelegate = VectoredHandler;
 		_handlerHandle = GCHandle.Alloc(_handlerDelegate);
-		_exceptionHandlerStub = _faultHandling.CreateHandlerThunk(Marshal.GetFunctionPointerForDelegate(_handlerDelegate), _hostRspSlotTlsIndex, _tlsGetValueAddress);
+		_exceptionHandlerStub = CreateExceptionHandlerTrampoline(Marshal.GetFunctionPointerForDelegate(_handlerDelegate));
 		if (_exceptionHandlerStub == 0)
 		{
 			throw new InvalidOperationException("Failed to create exception handler trampoline");
 		}
-		_exceptionHandler = _faultHandling.AddFirstChanceHandler(_exceptionHandlerStub);
+		_exceptionHandler = (nint)AddVectoredExceptionHandler(1u, _exceptionHandlerStub);
 		Console.Error.WriteLine($"[LOADER][INFO] Exception handler installed: 0x{_exceptionHandler:X16}");
 
 		_unhandledFilterDelegate = UnhandledExceptionFilter;
 		_unhandledFilterHandle = GCHandle.Alloc(_unhandledFilterDelegate);
-		_unhandledFilterStub = _faultHandling.CreateHandlerThunk(Marshal.GetFunctionPointerForDelegate(_unhandledFilterDelegate), _hostRspSlotTlsIndex, _tlsGetValueAddress);
+		_unhandledFilterStub = CreateExceptionHandlerTrampoline(Marshal.GetFunctionPointerForDelegate(_unhandledFilterDelegate));
 		if (_unhandledFilterStub == 0)
 		{
 			throw new InvalidOperationException("Failed to create unhandled exception filter trampoline");
 		}
-		_faultHandling.SetUnhandledFilter(_unhandledFilterStub);
+		SetUnhandledExceptionFilter(_unhandledFilterStub);
 	}
 
 	private unsafe int UnhandledExceptionFilter(void* exceptionInfo)
@@ -68,8 +68,8 @@ public sealed partial class DirectExecutionBackend
 		try
 		{
 			EXCEPTION_RECORD* exceptionRecord = ((EXCEPTION_POINTERS*)exceptionInfo)->ExceptionRecord;
-			ulong rip = ReadCtxU64(((EXCEPTION_POINTERS*)exceptionInfo)->ContextRecord, CTX_RIP);
-			ulong rsp = ReadCtxU64(((EXCEPTION_POINTERS*)exceptionInfo)->ContextRecord, CTX_RSP);
+			ulong rip = ReadCtxU64(((EXCEPTION_POINTERS*)exceptionInfo)->ContextRecord, 248);
+			ulong rsp = ReadCtxU64(((EXCEPTION_POINTERS*)exceptionInfo)->ContextRecord, 152);
 			Console.Error.WriteLine("[LOADER][FATAL] Unhandled exception filter fired.");
 			Console.Error.WriteLine($"[LOADER][FATAL]   Code: 0x{exceptionRecord->ExceptionCode:X8}");
 			Console.Error.WriteLine($"[LOADER][FATAL]   Exception Address: 0x{(ulong)(nint)exceptionRecord->ExceptionAddress:X16}");
@@ -108,19 +108,28 @@ public sealed partial class DirectExecutionBackend
 				return 0;
 			}
 
-			ulong rip = ReadCtxU64(contextRecord, CTX_RIP);
-			ulong rsp = ReadCtxU64(contextRecord, CTX_RSP);
-
-			// Thread-mode probe: a hardware exception raised while this thread is inside
-			// the managed import gateway means the VEH->managed reentry happened from
-			// cooperative GC mode — a ReversePInvokeBadTransition candidate.
-			if (LogThreadMode && _threadModeGatewayDepth > 0)
+			ulong rip = ReadCtxU64(contextRecord, 248);
+			ulong rsp = ReadCtxU64(contextRecord, 152);
+			if (TryRecoverGuestInt41(exceptionCode, contextRecord, rip))
 			{
-				TraceThreadMode(
-					$"veh_in_gateway code=0x{exceptionCode:X8} rip=0x{rip:X16} gateway_depth={_threadModeGatewayDepth}");
+				return -1;
+			}
+			if (TryRecoverAuxiliaryThreadExecuteFault(exceptionRecord, contextRecord, rip))
+			{
+				return -1;
 			}
 
-			if (exceptionCode == WindowsFaultCodes.AccessViolation && TryHandleLazyCommittedPage(exceptionRecord, rip, rsp))
+			if (exceptionCode == 3221225477u && TryHandleLazyCommittedPage(exceptionRecord, rip, rsp))
+			{
+				return -1;
+			}
+			if (exceptionCode == 3221225477u &&
+				TryRecoverGuestAllocatorHole(exceptionRecord, contextRecord, rip))
+			{
+				return -1;
+			}
+			if (exceptionCode == StatusIllegalInstruction &&
+				TryRecoverIllegalInstruction(contextRecord, rip))
 			{
 				return -1;
 			}
@@ -135,10 +144,10 @@ public sealed partial class DirectExecutionBackend
 
 			switch (exceptionCode)
 			{
-				case WindowsFaultCodes.AccessViolation:
+				case 3221225477u:
 					LogAccessViolationTrace(exceptionAddress, exceptionRecord);
 					break;
-				case WindowsFaultCodes.FastFail:
+				case 3221226505u:
 					{
 						ulong p0 = exceptionRecord->NumberParameters >= 1 ? (*exceptionRecord->ExceptionInformation) : 0;
 						ulong p1 = exceptionRecord->NumberParameters >= 2 ? exceptionRecord->ExceptionInformation[1] : 0;
@@ -148,27 +157,56 @@ public sealed partial class DirectExecutionBackend
 					}
 			}
 
-			ulong rax = ReadCtxU64(contextRecord, CTX_RAX);
-			ulong rbx = ReadCtxU64(contextRecord, CTX_RBX);
-			ulong rcx = ReadCtxU64(contextRecord, CTX_RCX);
-			ulong rdx = ReadCtxU64(contextRecord, CTX_RDX);
-			ulong rsi = ReadCtxU64(contextRecord, CTX_RSI);
-			ulong rdi = ReadCtxU64(contextRecord, CTX_RDI);
-			ulong rbp = ReadCtxU64(contextRecord, CTX_RBP);
-			ulong r8 = ReadCtxU64(contextRecord, CTX_R8);
-			ulong r9 = ReadCtxU64(contextRecord, CTX_R9);
-			ulong r10 = ReadCtxU64(contextRecord, CTX_R10);
-			ulong r11 = ReadCtxU64(contextRecord, CTX_R11);
-			ulong r12 = ReadCtxU64(contextRecord, CTX_R12);
-			ulong r13 = ReadCtxU64(contextRecord, CTX_R13);
-			ulong r14 = ReadCtxU64(contextRecord, CTX_R14);
-			ulong r15 = ReadCtxU64(contextRecord, CTX_R15);
+			ulong rax = ReadCtxU64(contextRecord, 120);
+			ulong rbx = ReadCtxU64(contextRecord, 144);
+			ulong rcx = ReadCtxU64(contextRecord, 128);
+			ulong rdx = ReadCtxU64(contextRecord, 136);
+			ulong rsi = ReadCtxU64(contextRecord, 168);
+			ulong rdi = ReadCtxU64(contextRecord, 176);
+			ulong rbp = ReadCtxU64(contextRecord, 160);
+			ulong r8 = ReadCtxU64(contextRecord, 184);
+			ulong r9 = ReadCtxU64(contextRecord, 192);
+			ulong r10 = ReadCtxU64(contextRecord, 200);
+			ulong r11 = ReadCtxU64(contextRecord, 208);
+			ulong r12 = ReadCtxU64(contextRecord, 216);
+			ulong r13 = ReadCtxU64(contextRecord, 224);
+			ulong r14 = ReadCtxU64(contextRecord, 232);
+			ulong r15 = ReadCtxU64(contextRecord, 240);
 
 			Console.Error.WriteLine("[LOADER][INFO] =========================================");
 			Console.Error.WriteLine("[LOADER][INFO] NATIVE EXCEPTION CAUGHT!");
 			Console.Error.WriteLine($"[LOADER][INFO]   Code: 0x{exceptionCode:X8}");
 			Console.Error.WriteLine($"[LOADER][INFO]   Exception Address: 0x{exceptionAddress:X16}");
 			Console.Error.WriteLine($"[LOADER][INFO]   RIP: 0x{rip:X16}");
+			Console.Error.WriteLine(
+				$"[LOADER][INFO]   Host thread: managed={Environment.CurrentManagedThreadId} " +
+				$"name='{Thread.CurrentThread.Name ?? "<unnamed>"}'");
+			if (_activeGuestThreadState is { } activeGuestThread)
+			{
+				Console.Error.WriteLine(
+					$"[LOADER][INFO]   Guest thread: handle=0x{activeGuestThread.ThreadHandle:X16} " +
+					$"name='{activeGuestThread.Name}' state={activeGuestThread.State} " +
+					$"last_import={activeGuestThread.LastImportNid ?? "<none>"} " +
+					$"last_ret=0x{activeGuestThread.LastReturnRip:X16}");
+				Console.Error.WriteLine(
+					$"[LOADER][INFO]   Last import registers: " +
+					$"rax=0x{Volatile.Read(ref activeGuestThread.LastImportRax):X16} " +
+					$"result_valid={Volatile.Read(ref activeGuestThread.LastImportResultValid) != 0} " +
+					$"rdi=0x{activeGuestThread.LastImportRdi:X16} " +
+					$"rsi=0x{activeGuestThread.LastImportRsi:X16} " +
+					$"rdx=0x{activeGuestThread.LastImportRdx:X16} " +
+					$"rcx=0x{activeGuestThread.LastImportRcx:X16} " +
+					$"r8=0x{activeGuestThread.LastImportR8:X16} " +
+					$"r9=0x{activeGuestThread.LastImportR9:X16}");
+				Console.Error.WriteLine(
+					$"[LOADER][INFO]   Last import stack args: " +
+					$"0=0x{activeGuestThread.LastImportStack0:X16} " +
+					$"1=0x{activeGuestThread.LastImportStack1:X16} " +
+					$"2=0x{activeGuestThread.LastImportStack2:X16} " +
+					$"3=0x{activeGuestThread.LastImportStack3:X16} " +
+					$"4=0x{activeGuestThread.LastImportStack4:X16} " +
+					$"5=0x{activeGuestThread.LastImportStack5:X16}");
+			}
 			if (TryFormatNearestRuntimeSymbol(rip, out string symbol))
 			{
 				Console.Error.WriteLine("[LOADER][INFO]   RIP symbol: " + symbol);
@@ -193,7 +231,7 @@ public sealed partial class DirectExecutionBackend
 
 			ulong accessType = 0;
 			ulong target = 0;
-			if (exceptionCode == WindowsFaultCodes.AccessViolation && exceptionRecord->NumberParameters >= 2)
+			if (exceptionCode == 3221225477u && exceptionRecord->NumberParameters >= 2)
 			{
 				accessType = *exceptionRecord->ExceptionInformation;
 				target = exceptionRecord->ExceptionInformation[1];
@@ -206,9 +244,9 @@ public sealed partial class DirectExecutionBackend
 				};
 				Console.Error.WriteLine("[LOADER][INFO]   AV access: " + accessText);
 				Console.Error.WriteLine($"[LOADER][INFO]   AV target: 0x{target:X16}");
-				if (_hostMemory.Query(target, out var mbi))
+				if (VirtualQuery((void*)target, out var mbi, (nuint)sizeof(MEMORY_BASIC_INFORMATION64)) != 0)
 				{
-					Console.Error.WriteLine($"[LOADER][INFO]   AV target region: base=0x{mbi.BaseAddress:X16} size=0x{mbi.RegionSize:X16} state=0x{mbi.RawState:X08} protect=0x{mbi.RawProtection:X08}");
+					Console.Error.WriteLine($"[LOADER][INFO]   AV target region: base=0x{mbi.BaseAddress:X16} size=0x{mbi.RegionSize:X16} state=0x{mbi.State:X08} protect=0x{mbi.Protect:X08}");
 				}
 
 			}
@@ -225,13 +263,46 @@ public sealed partial class DirectExecutionBackend
 				Console.Error.WriteLine($"[LOADER][INFO]     [rsp+0x{i * 8:X2}] @0x{stackAddr:X16} = 0x{value:X16}");
 			}
 
+			if (string.Equals(
+					Environment.GetEnvironmentVariable("SHARPEMU_DUMP_FAULT_STACK_WINDOW"),
+					"1",
+					StringComparison.Ordinal))
+			{
+				Console.Error.WriteLine("[LOADER][INFO]   Full fault stack window (RSP-0x300..RSP+0x100):");
+				var windowStart = rsp >= 0x300 ? rsp - 0x300 : 0;
+				for (var stackAddr = windowStart; stackAddr < rsp + 0x100; stackAddr += 8)
+				{
+					if (!TryReadHostQword(stackAddr, out var value))
+					{
+						continue;
+					}
+
+					var relative = unchecked((long)(stackAddr - rsp));
+					var relativeText = relative >= 0
+						? $"+0x{relative:X}"
+						: $"-0x{-relative:X}";
+					var symbolText = TryFormatNearestRuntimeSymbol(value, out var stackSymbol)
+						? $" [{stackSymbol}]"
+						: string.Empty;
+					Console.Error.WriteLine(
+						$"[LOADER][INFO]     [rsp{relativeText}] " +
+						$"@0x{stackAddr:X16} = 0x{value:X16}{symbolText}");
+				}
+			}
+
+			DumpPointerWindow("fault-register-rbx", rbx, 0x60);
+			DumpPointerWindow("fault-register-rsi", rsi, 0x60);
+			DumpPointerWindow("fault-register-rdi", rdi, 0x60);
+			DumpPointerWindow("fault-register-r13", r13, 0x60);
+			DumpPointerWindow("fault-register-r14", r14, 0x60);
+
 			try
 			{
 				Console.Error.WriteLine("[LOADER][INFO]   Frame chain (RBP walk):");
 				ulong frame = rbp;
 				for (int i = 0; i < 12; i++)
 				{
-					if (frame < 140733193388032L || frame > 140737488355327L)
+					if (frame < 0x10000)
 					{
 						break;
 					}
@@ -256,7 +327,7 @@ public sealed partial class DirectExecutionBackend
 
 			switch (exceptionCode)
 			{
-				case WindowsFaultCodes.AccessViolation:
+				case 3221225477u:
 					Console.Error.WriteLine("[LOADER][ERROR]   Type: Access Violation");
 					Console.Error.WriteLine("[LOADER][ERROR]   This usually means:");
 					Console.Error.WriteLine("[LOADER][ERROR]     - Guest code called an unmapped import");
@@ -290,22 +361,57 @@ public sealed partial class DirectExecutionBackend
 						{
 							Console.Error.WriteLine("[LOADER][INFO]   Code window [RIP-0x20..]: " + BitConverter.ToString(window).Replace("-", " "));
 						}
+						for (var stackIndex = 0; stackIndex < 16; stackIndex++)
+						{
+							byte[] stackSlot = new byte[8];
+							if (!TryReadHostBytes(rsp + (ulong)(stackIndex * 8), stackSlot))
+							{
+								continue;
+							}
+							var candidate = BitConverter.ToUInt64(stackSlot);
+							if (candidate < _entryPoint || candidate >= _entryPoint + 0x10000000 || candidate < 24)
+							{
+								continue;
+							}
+							byte[] callSiteWindow = new byte[48];
+							if (TryReadHostBytes(candidate - 24, callSiteWindow))
+							{
+								Console.Error.WriteLine(
+									$"[LOADER][INFO]   Stack guest-code candidate [rsp+0x{stackIndex * 8:X2}]=0x{candidate:X16}, bytes [-0x18..]: " +
+									BitConverter.ToString(callSiteWindow).Replace("-", " "));
+							}
+						}
 					}
 					else
 					{
 						Console.Error.WriteLine("[LOADER][ERROR]   Could not read code at RIP");
 					}
 					DumpRecentImportTrace();
-					DumpGuestDisasmDiagnostics(rip, rbp);
+					DumpGuestDisasmDiagnostics(rip, rbp, rsp);
+					DumpGuestRegisterWindowDiagnostics(
+						rax, rbx, rcx, rdx, rsi, rdi, rbp, rsp,
+						r8, r9, r10, r11, r12, r13, r14, r15);
 					DumpGuestReferenceDiagnostics();
 					DumpGuestPointerWindowDiagnostics();
 					break;
-				case WindowsFaultCodes.Breakpoint:
+				case 2147483651u:
 					Console.Error.WriteLine("[LOADER][WARNING]   Type: Breakpoint (int3)");
 					Console.Error.WriteLine("[LOADER][WARNING]   Unexpected breakpoint in direct-bridge mode");
 					break;
-				case WindowsFaultCodes.IllegalInstruction:
+				case 1073741845u:
+					Console.Error.WriteLine("[LOADER][ERROR]   Type: Abort (SIGABRT)");
+					DumpRecentImportTrace();
+					DumpGuestDisasmDiagnostics(rip, rbp, rsp);
+					break;
+				case 3221225501u:
 					Console.Error.WriteLine("[LOADER][INFO]   Type: Illegal Instruction");
+					byte[] illegalCode = new byte[16];
+					if (TryReadHostBytes(rip, illegalCode))
+					{
+						Console.Error.WriteLine("[LOADER][INFO]   Code at RIP: " + BitConverter.ToString(illegalCode).Replace("-", " "));
+					}
+					DumpRecentImportTrace();
+					DumpGuestDisasmDiagnostics(rip, rbp, rsp);
 					break;
 			}
 
@@ -319,6 +425,108 @@ public sealed partial class DirectExecutionBackend
 		}
 	}
 
+	private unsafe bool TryRecoverAuxiliaryThreadExecuteFault(
+		EXCEPTION_RECORD* exceptionRecord,
+		void* contextRecord,
+		ulong rip)
+	{
+		if (exceptionRecord->ExceptionCode != 3221225477u ||
+			rip >= 0x0000000800000000UL ||
+			_activeGuestThreadState is not { Name: "tbb_thead" } activeThread)
+		{
+			return false;
+		}
+
+		var hostExit = ActiveEntryReturnSentinelRip;
+		if (hostExit < 0x10000)
+		{
+			hostExit = unchecked((ulong)_guestReturnStub);
+		}
+		if (hostExit < 0x10000)
+		{
+			Console.Error.WriteLine(
+				$"[LOADER][WARN] Could not recover auxiliary TBB execute fault: target=0x{rip:X16} " +
+				$"active_exit=0x{ActiveEntryReturnSentinelRip:X16} guest_return_stub=0x{unchecked((ulong)_guestReturnStub):X16}");
+			return false;
+		}
+
+		_ = TryPatchActiveGuestReturnSlot(hostExit);
+		WriteCtxU64(contextRecord, 120, 0);
+		WriteCtxU64(contextRecord, 248, hostExit);
+		var recovery = Interlocked.Increment(ref _auxiliaryThreadExecuteFaultRecoveries);
+		Console.Error.WriteLine(
+			$"[LOADER][WARN] Recovered auxiliary TBB execute fault #{recovery}: " +
+			$"thread=0x{activeThread.ThreadHandle:X16} target=0x{rip:X16} -> host_exit=0x{hostExit:X16}");
+		return true;
+	}
+
+	private unsafe bool TryRecoverGuestInt41(uint exceptionCode, void* contextRecord, ulong rip)
+	{
+		if (!_ignoreGuestInt41 || exceptionCode != 3221225477u || rip < 0x10000)
+		{
+			return false;
+		}
+
+		byte[] opcode = new byte[2];
+		if (!TryReadHostBytes(rip, opcode) || opcode[0] != 0xCD || opcode[1] != 0x41)
+		{
+			return false;
+		}
+
+		var count = Interlocked.Increment(ref _ignoredGuestInt41Count);
+		WriteCtxU64(contextRecord, 248, rip + 2);
+		if (count <= 16 || count % 65536 == 0)
+		{
+			Console.Error.WriteLine(
+				$"[LOADER][WARN] Ignored guest int 0x41 trap #{count} at 0x{rip:X16} (SHARPEMU_IGNORE_INT41=1)");
+			Console.Error.Flush();
+		}
+		return true;
+	}
+
+	private unsafe static bool TryRecoverGuestAllocatorHole(
+		EXCEPTION_RECORD* exceptionRecord,
+		void* contextRecord,
+		ulong rip)
+	{
+		if (string.Equals(
+				Environment.GetEnvironmentVariable("SHARPEMU_DISABLE_GUEST_ALLOCATOR_HOLE_RECOVERY"),
+				"1",
+				StringComparison.Ordinal) ||
+			exceptionRecord->NumberParameters < 2 ||
+			exceptionRecord->ExceptionInformation[0] != 0 ||
+			exceptionRecord->ExceptionInformation[1] != 8 ||
+			ReadCtxU64(contextRecord, CTX_RDI) != 0 ||
+			rip < 0x10000)
+		{
+			return false;
+		}
+
+		// Demon's Souls occasionally leaves an empty payload in a locked pool
+		// tree node. The allocator dereferences payload+8 before reaching its
+		// existing empty-pool fallback. Match the instruction stream instead of
+		// a title-specific absolute address, then resume at that fallback so the
+		// lock is released and the allocator can try its next backing pool.
+		const ulong allocatorHoleSignature = 0x634CFF568D08778BUL;
+		if (*(ulong*)rip != allocatorHoleSignature || *((byte*)rip + 8) != 0xF2)
+		{
+			return false;
+		}
+
+		const ulong emptyPoolFallbackDelta = 0x8E;
+		WriteCtxU64(contextRecord, CTX_RIP, rip + emptyPoolFallbackDelta);
+		var recovery = Interlocked.Increment(ref _guestAllocatorHoleRecoveries);
+		if (recovery <= 16 || (recovery & (recovery - 1)) == 0)
+		{
+			Console.Error.WriteLine(
+				$"[LOADER][WARN] Guest allocator empty-node adapter recovery #{recovery}: " +
+				$"rip=0x{rip:X16} -> 0x{rip + emptyPoolFallbackDelta:X16}");
+			Console.Error.Flush();
+		}
+
+		return true;
+	}
+
 	private static bool IsBenignHostDebugException(uint exceptionCode)
 	{
 		return exceptionCode is DBG_PRINTEXCEPTION_C or DBG_PRINTEXCEPTION_WIDE_C or MS_VC_THREADNAME_EXCEPTION;
@@ -337,8 +545,8 @@ public sealed partial class DirectExecutionBackend
 			EXCEPTION_POINTERS* pointers = (EXCEPTION_POINTERS*)exceptionInfo;
 			EXCEPTION_RECORD* record = pointers->ExceptionRecord;
 			void* contextRecord = pointers->ContextRecord;
-			ulong rip = contextRecord != null ? ReadCtxU64(contextRecord, CTX_RIP) : 0;
-			ulong rsp = contextRecord != null ? ReadCtxU64(contextRecord, CTX_RSP) : 0;
+			ulong rip = contextRecord != null ? ReadCtxU64(contextRecord, 248) : 0;
+			ulong rsp = contextRecord != null ? ReadCtxU64(contextRecord, 152) : 0;
 			ulong accessType = record->NumberParameters >= 1 ? *record->ExceptionInformation : 0;
 			ulong target = record->NumberParameters >= 2 ? record->ExceptionInformation[1] : 0;
 			Console.Error.WriteLine(
@@ -398,7 +606,7 @@ public sealed partial class DirectExecutionBackend
 		}
 	}
 
-	private void DumpGuestDisasmDiagnostics(ulong rip, ulong rbp)
+	private void DumpGuestDisasmDiagnostics(ulong rip, ulong rbp, ulong rsp)
 	{
 		if (!string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_DISASM"), "1", StringComparison.Ordinal))
 		{
@@ -410,12 +618,20 @@ public sealed partial class DirectExecutionBackend
 			DumpGuestInstructionStream("fault-prelude", rip - 0x20, 24);
 		}
 
+		// Optimized guest code frequently omits frame pointers. The return
+		// address at RSP is then more useful than an RBP walk and identifies the
+		// exact call site that supplied the faulting arguments.
+		if (TryReadHostQword(rsp, out var stackReturn) && stackReturn >= 0x60)
+		{
+			DumpGuestInstructionStream("stack-return-prelude", stackReturn - 0x60, 40);
+		}
+
 		try
 		{
 			ulong frame = rbp;
 			for (int i = 0; i < 3; i++)
 			{
-				if (frame < 140733193388032L || frame > 140737488355327L)
+				if (frame < 0x10000)
 				{
 					break;
 				}
@@ -484,7 +700,7 @@ public sealed partial class DirectExecutionBackend
 		ulong address = scanBase;
 		while (address < scanEnd)
 		{
-			if (!_hostMemory.Query(address, out var mbi))
+			if (VirtualQuery((void*)address, out var mbi, (nuint)sizeof(MEMORY_BASIC_INFORMATION64)) == 0)
 			{
 				break;
 			}
@@ -496,9 +712,9 @@ public sealed partial class DirectExecutionBackend
 				break;
 			}
 
-			if (mbi.State == HostRegionState.Committed &&
-				IsReadableProtection(mbi.RawProtection) &&
-				IsExecutableProtection(mbi.RawProtection))
+			if (mbi.State == MEM_COMMIT &&
+				IsReadableProtection(mbi.Protect) &&
+				IsExecutableProtection(mbi.Protect))
 			{
 				ScanExecutableRegionForTargetReferences(regionBase, regionEnd, targetList, hitCounts, maxHitsPerTarget);
 			}
@@ -559,6 +775,55 @@ public sealed partial class DirectExecutionBackend
 		}
 	}
 
+	private void DumpGuestRegisterWindowDiagnostics(
+		ulong rax,
+		ulong rbx,
+		ulong rcx,
+		ulong rdx,
+		ulong rsi,
+		ulong rdi,
+		ulong rbp,
+		ulong rsp,
+		ulong r8,
+		ulong r9,
+		ulong r10,
+		ulong r11,
+		ulong r12,
+		ulong r13,
+		ulong r14,
+		ulong r15)
+	{
+		if (!string.Equals(
+				Environment.GetEnvironmentVariable("SHARPEMU_LOG_REGISTER_WINDOWS"),
+				"1",
+				StringComparison.Ordinal))
+		{
+			return;
+		}
+
+		// A register can be the only surviving reference to the object or
+		// argument array that caused a native guest fault. Capture a compact
+		// window while the process is alive so the post-mortem log can
+		// distinguish an absent object from a partially initialized one.
+		var registers = new (string Name, ulong Value)[]
+		{
+			("rax", rax), ("rbx", rbx), ("rcx", rcx), ("rdx", rdx),
+			("rsi", rsi), ("rdi", rdi), ("rbp", rbp), ("rsp", rsp),
+			("r8", r8), ("r9", r9), ("r10", r10), ("r11", r11),
+			("r12", r12), ("r13", r13), ("r14", r14), ("r15", r15),
+		};
+		var seen = new HashSet<ulong>();
+		foreach (var (name, value) in registers)
+		{
+			if (value < 0x10000 || !seen.Add(value))
+			{
+				continue;
+			}
+
+			DumpPointerWindow($"register-{name}", value, 0x80);
+		}
+	}
+
 	private void ScanExecutableRegionForTargetReferences(
 		ulong regionBase,
 		ulong regionEnd,
@@ -803,13 +1068,13 @@ public sealed partial class DirectExecutionBackend
 			return false;
 		}
 
-		if (!_hostMemory.Query(address, out var mbi))
+		if (VirtualQuery((void*)address, out var mbi, (nuint)sizeof(MEMORY_BASIC_INFORMATION64)) == 0)
 		{
 			return false;
 		}
 
 		ulong regionEnd = mbi.BaseAddress + mbi.RegionSize;
-		if (mbi.State != HostRegionState.Committed || !IsReadableProtection(mbi.RawProtection) || regionEnd <= address || address > regionEnd - 8)
+		if (mbi.State != MEM_COMMIT || !IsReadableProtection(mbi.Protect) || regionEnd <= address || address > regionEnd - 8)
 		{
 			return false;
 		}
@@ -848,7 +1113,7 @@ public sealed partial class DirectExecutionBackend
 		}
 	}
 
-	private unsafe bool TryReadHostBytes(ulong address, byte[] buffer)
+	private unsafe static bool TryReadHostBytes(ulong address, byte[] buffer)
 	{
 		if (address < 65536)
 		{
@@ -861,9 +1126,9 @@ public sealed partial class DirectExecutionBackend
 			ulong end = address + (ulong)buffer.Length;
 			for (ulong page = address & 0xFFFFFFFFFFFFF000uL; page < end; page += 4096)
 			{
-				if (!_hostMemory.Query(page, out var mbi) ||
-					mbi.State != HostRegionState.Committed ||
-					!IsReadableProtection(mbi.RawProtection))
+				if (VirtualQuery((void*)page, out var mbi, (nuint)sizeof(MEMORY_BASIC_INFORMATION64)) == 0 ||
+					mbi.State != MEM_COMMIT ||
+					!IsReadableProtection(mbi.Protect))
 				{
 					return false;
 				}
@@ -976,25 +1241,25 @@ public sealed partial class DirectExecutionBackend
 		{
 			return false;
 		}
-		if (!_hostMemory.Query(faultAddress, out var mbi))
+		if (VirtualQuery((void*)faultAddress, out var mbi, (nuint)sizeof(MEMORY_BASIC_INFORMATION64)) == 0)
 		{
 			return false;
 		}
 
 		ulong pageBase = faultAddress & 0xFFFFFFFFFFFFF000uL;
-		uint commitProtect = ResolveLazyCommitProtection(accessType, mbi.RawAllocationProtection);
+		uint commitProtect = ResolveLazyCommitProtection(accessType, mbi.AllocationProtect);
 		int traceIndex = Interlocked.Increment(ref _lazyCommitTraceCount);
 		bool traceLazyCommit = ShouldTraceLazyCommit(traceIndex);
 		if (traceLazyCommit)
 		{
-			Console.Error.WriteLine($"[LOADER][TRACE] lazy-query#{traceIndex}: fault=0x{faultAddress:X16} owner={owner} rip=0x{rip:X16} rsp=0x{rsp:X16} state=0x{mbi.RawState:X08} base=0x{mbi.BaseAddress:X16} size=0x{mbi.RegionSize:X16} alloc=0x{mbi.RawAllocationProtection:X08} prot=0x{mbi.RawProtection:X08}");
+			Console.Error.WriteLine($"[LOADER][TRACE] lazy-query#{traceIndex}: fault=0x{faultAddress:X16} owner={owner} rip=0x{rip:X16} rsp=0x{rsp:X16} state=0x{mbi.State:X08} base=0x{mbi.BaseAddress:X16} size=0x{mbi.RegionSize:X16} alloc=0x{mbi.AllocationProtect:X08} prot=0x{mbi.Protect:X08}");
 		}
 
-		if (mbi.State == HostRegionState.Committed && IsAccessCompatible(accessType, mbi.RawProtection))
+		if (mbi.State == 4096 && IsAccessCompatible(accessType, mbi.Protect))
 		{
 			if (traceLazyCommit)
 			{
-				Console.Error.WriteLine($"[LOADER][TRACE] lazy-commit-race#{traceIndex}: fault=0x{faultAddress:X16} protect=0x{mbi.RawProtection:X08}");
+				Console.Error.WriteLine($"[LOADER][TRACE] lazy-commit-race#{traceIndex}: fault=0x{faultAddress:X16} protect=0x{mbi.Protect:X08}");
 			}
 			return true;
 		}
@@ -1003,10 +1268,10 @@ public sealed partial class DirectExecutionBackend
 		ulong committedBase = 0;
 		ulong committedSize = 0;
 
-		if (mbi.State == HostRegionState.Free)
+		if (mbi.State == 65536)
 		{
 			if (TryGetLazyCommitWindow(faultAddress, mbi.BaseAddress, mbi.RegionSize, out var windowBase, out var windowSize) &&
-				TryReserveThenCommit(_hostMemory, windowBase, windowSize, windowBase, windowSize, commitProtect))
+				TryReserveThenCommit(windowBase, windowSize, windowBase, windowSize, commitProtect))
 			{
 				committed = true;
 				committedBase = windowBase;
@@ -1015,7 +1280,7 @@ public sealed partial class DirectExecutionBackend
 			else
 			{
 				ulong largeBase = faultAddress & 0xFFFFFFFFFFE00000uL;
-				if (TryReserveThenCommit(_hostMemory, largeBase, 2097152uL, largeBase, 2097152uL, commitProtect))
+				if (TryReserveThenCommit(largeBase, 2097152uL, largeBase, 2097152uL, commitProtect))
 				{
 					committed = true;
 					committedBase = largeBase;
@@ -1026,13 +1291,13 @@ public sealed partial class DirectExecutionBackend
 			if (!committed)
 			{
 				ulong region64kBase = faultAddress & 0xFFFFFFFFFFFF0000uL;
-				if (TryReserveThenCommit(_hostMemory, region64kBase, 65536uL, region64kBase, 65536uL, commitProtect))
+				if (TryReserveThenCommit(region64kBase, 65536uL, region64kBase, 65536uL, commitProtect))
 				{
 					committed = true;
 					committedBase = region64kBase;
 					committedSize = 65536uL;
 				}
-				else if (TryReserveThenCommit(_hostMemory, pageBase, 4096uL, pageBase, 4096uL, commitProtect))
+				else if (TryReserveThenCommit(pageBase, 4096uL, pageBase, 4096uL, commitProtect))
 				{
 					committed = true;
 					committedBase = pageBase;
@@ -1045,7 +1310,7 @@ public sealed partial class DirectExecutionBackend
 				return false;
 			}
 
-			TryCommitRange(_hostMemory, pageBase + 4096, 4096uL, commitProtect);
+			TryCommitRange(pageBase + 4096, 4096uL, commitProtect);
 			if (traceLazyCommit)
 			{
 				Console.Error.WriteLine($"[LOADER][TRACE] lazy-reserve-commit#{traceIndex}: addr=0x{committedBase:X16} size=0x{committedSize:X16} access={accessType} protect=0x{commitProtect:X8}");
@@ -1053,13 +1318,13 @@ public sealed partial class DirectExecutionBackend
 			return true;
 		}
 
-		if (mbi.State != HostRegionState.Reserved)
+		if (mbi.State != 8192)
 		{
 			return false;
 		}
 
 		if (TryGetLazyCommitWindow(faultAddress, mbi.BaseAddress, mbi.RegionSize, out var commitWindowBase, out var commitWindowSize) &&
-			TryCommitRange(_hostMemory, commitWindowBase, commitWindowSize, commitProtect))
+			TryCommitRange(commitWindowBase, commitWindowSize, commitProtect))
 		{
 			committed = true;
 			committedBase = commitWindowBase;
@@ -1068,7 +1333,7 @@ public sealed partial class DirectExecutionBackend
 		else
 		{
 			ulong largeCommitBase = faultAddress & 0xFFFFFFFFFFE00000uL;
-			if (TryCommitRange(_hostMemory, largeCommitBase, 2097152uL, commitProtect))
+			if (TryCommitRange(largeCommitBase, 2097152uL, commitProtect))
 			{
 				committed = true;
 				committedBase = largeCommitBase;
@@ -1079,19 +1344,19 @@ public sealed partial class DirectExecutionBackend
 		if (!committed)
 		{
 			ulong region64kBase = faultAddress & 0xFFFFFFFFFFFF0000uL;
-			if (TryCommitRange(_hostMemory, region64kBase, 65536uL, commitProtect))
+			if (TryCommitRange(region64kBase, 65536uL, commitProtect))
 			{
 				committed = true;
 				committedBase = region64kBase;
 				committedSize = 65536uL;
 			}
-			else if (TryCommitRange(_hostMemory, pageBase, 8192uL, commitProtect))
+			else if (TryCommitRange(pageBase, 8192uL, commitProtect))
 			{
 				committed = true;
 				committedBase = pageBase;
 				committedSize = 8192uL;
 			}
-			else if (TryCommitRange(_hostMemory, pageBase, 4096uL, commitProtect))
+			else if (TryCommitRange(pageBase, 4096uL, commitProtect))
 			{
 				committed = true;
 				committedBase = pageBase;
@@ -1104,7 +1369,7 @@ public sealed partial class DirectExecutionBackend
 			return false;
 		}
 
-		TryCommitRange(_hostMemory, pageBase + 4096, 4096uL, commitProtect);
+		TryCommitRange(pageBase + 4096, 4096uL, commitProtect);
 		if (traceLazyCommit)
 		{
 			Console.Error.WriteLine($"[LOADER][TRACE] lazy-commit#{traceIndex}: addr=0x{committedBase:X16} size=0x{committedSize:X16} access={accessType} protect=0x{commitProtect:X8}");
@@ -1145,33 +1410,31 @@ public sealed partial class DirectExecutionBackend
 			return true;
 		}
 
-		// The commit protection is one of the two raw values ResolveLazyCommitProtection
-		// produces (0x40 RWX / 0x04 RW); the enum mapping reproduces those exactly.
-		static bool TryCommitRange(IHostMemory hostMemory, ulong baseAddress, ulong length, uint protection)
+		static unsafe bool TryCommitRange(ulong baseAddress, ulong length, uint protection)
 		{
 			if (length == 0)
 			{
 				return false;
 			}
-			return hostMemory.Commit(baseAddress, length, protection == 64u ? HostPageProtection.ReadWriteExecute : HostPageProtection.ReadWrite);
+			return VirtualAlloc((void*)baseAddress, (nuint)length, 4096u, protection) != null;
 		}
 
-		static bool TryReserveRange(IHostMemory hostMemory, ulong baseAddress, ulong length)
+		static unsafe bool TryReserveRange(ulong baseAddress, ulong length)
 		{
 			if (length == 0)
 			{
 				return false;
 			}
-			return hostMemory.Reserve(baseAddress, length, HostPageProtection.ReadWrite) != 0;
+			return VirtualAlloc((void*)baseAddress, (nuint)length, 8192u, 4u) != null;
 		}
 
-		static bool TryReserveThenCommit(IHostMemory hostMemory, ulong reserveAddress, ulong reserveSize, ulong commitAddress, ulong commitSize, uint protection)
+		static bool TryReserveThenCommit(ulong reserveAddress, ulong reserveSize, ulong commitAddress, ulong commitSize, uint protection)
 		{
-			if (!TryReserveRange(hostMemory, reserveAddress, reserveSize))
+			if (!TryReserveRange(reserveAddress, reserveSize))
 			{
 				return false;
 			}
-			return TryCommitRange(hostMemory, commitAddress, commitSize, protection);
+			return TryCommitRange(commitAddress, commitSize, protection);
 		}
 
 		static bool IsAccessCompatible(ulong accessType, uint protection)

src/SharpEmu.Core/Cpu/Native/DirectExecutionBackend.IllegalInstruction.cs

@@ -0,0 +1,362 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Buffers.Binary;
+using System.Threading;
+using Iced.Intel;
+using SharpEmu.Core.Cpu.Emulation;
+
+namespace SharpEmu.Core.Cpu.Native;
+
+// Software fallback for the BMI1/BMI2/ABM general-purpose-register instructions.
+//
+// Guest code runs natively, so the guest and host share the same virtual address space and the
+// same registers (the OS delivers them in the CONTEXT record on a fault). When the host CPU lacks
+// one of these extensions it raises #UD instead of executing the opcode; without this the title
+// simply aborts. Here we decode the faulting instruction, evaluate it against the trapped register
+// and memory state, write the result back into the CONTEXT, step RIP past the instruction and ask
+// the OS to continue. Only the register-only BMI/ABM forms are handled; anything else returns false
+// and falls through to the existing diagnostics unchanged, so this can never mis-handle an opcode it
+// does not fully model.
+public sealed partial class DirectExecutionBackend
+{
+    // Windows x64 CONTEXT.EFlags lives just past the segment selectors. The GPR offsets it shares
+    // with the rest of the backend are the CTX_* constants declared in DirectExecutionBackend.cs.
+    private const int CTX_EFLAGS = 68;
+
+    // STATUS_ILLEGAL_INSTRUCTION (#UD surfaced by the Windows vectored handler).
+    private const uint StatusIllegalInstruction = 0xC000001Du;
+
+    private const int MaxInstructionBytes = 15;
+
+    // Instruction-window sizes tried in turn so a fault near a page boundary still decodes.
+    private static readonly int[] DecodeWindowSizes = { MaxInstructionBytes, 11, 8, 4, 2 };
+
+    private static int _bmiSoftwareFallbackAnnounced;
+    private static long _bmiInstructionsEmulated;
+
+    private unsafe bool TryRecoverIllegalInstruction(void* contextRecord, ulong rip)
+    {
+        if (!TryReadFaultingInstruction(rip, out var instruction))
+        {
+            return false;
+        }
+
+        if (instruction.Op0Kind != OpKind.Register ||
+            !TryGetGprSlot(instruction.Op0Register, out var destOffset, out var size))
+        {
+            return false;
+        }
+
+        if (!TryEvaluate(contextRecord, in instruction, size, out var result, out var flagsChanged, out var eflags))
+        {
+            return false;
+        }
+
+        WriteCtxU64(contextRecord, destOffset, result);
+        if (flagsChanged)
+        {
+            WriteCtxU32(contextRecord, CTX_EFLAGS, eflags);
+        }
+
+        WriteCtxU64(contextRecord, CTX_RIP, rip + (ulong)instruction.Length);
+
+        Interlocked.Increment(ref _bmiInstructionsEmulated);
+        if (Interlocked.Exchange(ref _bmiSoftwareFallbackAnnounced, 1) == 0)
+        {
+            Console.Error.WriteLine(
+                "[LOADER][INFO] Host lacks a BMI/ABM extension used by the guest; " +
+                "emulating those instructions in software.");
+        }
+
+        return true;
+    }
+
+    private unsafe bool TryEvaluate(
+        void* contextRecord,
+        in Instruction instruction,
+        GprOperandSize size,
+        out ulong result,
+        out bool flagsChanged,
+        out uint eflags)
+    {
+        result = 0;
+        flagsChanged = false;
+        eflags = ReadCtxU32(contextRecord, CTX_EFLAGS);
+
+        switch (instruction.Mnemonic)
+        {
+            case Mnemonic.Andn:
+                if (!TryReadOperand(contextRecord, in instruction, 1, size, out var andnSrc1) ||
+                    !TryReadOperand(contextRecord, in instruction, 2, size, out var andnSrc2))
+                {
+                    return false;
+                }
+
+                result = BmiInstructionEmulator.Andn(andnSrc1, andnSrc2, size, ref eflags);
+                flagsChanged = true;
+                return true;
+
+            case Mnemonic.Blsi:
+            case Mnemonic.Blsmsk:
+            case Mnemonic.Blsr:
+                if (!TryReadOperand(contextRecord, in instruction, 1, size, out var blsSrc))
+                {
+                    return false;
+                }
+
+                result = instruction.Mnemonic switch
+                {
+                    Mnemonic.Blsi => BmiInstructionEmulator.Blsi(blsSrc, size, ref eflags),
+                    Mnemonic.Blsmsk => BmiInstructionEmulator.Blsmsk(blsSrc, size, ref eflags),
+                    _ => BmiInstructionEmulator.Blsr(blsSrc, size, ref eflags),
+                };
+                flagsChanged = true;
+                return true;
+
+            case Mnemonic.Bextr:
+                if (!TryReadOperand(contextRecord, in instruction, 1, size, out var bextrSrc) ||
+                    !TryReadOperand(contextRecord, in instruction, 2, size, out var bextrControl))
+                {
+                    return false;
+                }
+
+                result = BmiInstructionEmulator.Bextr(bextrSrc, bextrControl, size, ref eflags);
+                flagsChanged = true;
+                return true;
+
+            case Mnemonic.Bzhi:
+                if (!TryReadOperand(contextRecord, in instruction, 1, size, out var bzhiSrc) ||
+                    !TryReadOperand(contextRecord, in instruction, 2, size, out var bzhiIndex))
+                {
+                    return false;
+                }
+
+                result = BmiInstructionEmulator.Bzhi(bzhiSrc, bzhiIndex, size, ref eflags);
+                flagsChanged = true;
+                return true;
+
+            case Mnemonic.Tzcnt:
+            case Mnemonic.Lzcnt:
+                if (!TryReadOperand(contextRecord, in instruction, 1, size, out var cntSrc))
+                {
+                    return false;
+                }
+
+                result = instruction.Mnemonic == Mnemonic.Tzcnt
+                    ? BmiInstructionEmulator.Tzcnt(cntSrc, size, ref eflags)
+                    : BmiInstructionEmulator.Lzcnt(cntSrc, size, ref eflags);
+                flagsChanged = true;
+                return true;
+
+            case Mnemonic.Rorx:
+                if (instruction.Op2Kind != OpKind.Immediate8 ||
+                    !TryReadOperand(contextRecord, in instruction, 1, size, out var rorxSrc))
+                {
+                    return false;
+                }
+
+                result = BmiInstructionEmulator.Rorx(rorxSrc, instruction.Immediate8, size);
+                return true;
+
+            case Mnemonic.Sarx:
+            case Mnemonic.Shlx:
+            case Mnemonic.Shrx:
+                if (!TryReadOperand(contextRecord, in instruction, 1, size, out var shiftSrc) ||
+                    !TryReadOperand(contextRecord, in instruction, 2, size, out var shiftCount))
+                {
+                    return false;
+                }
+
+                result = instruction.Mnemonic switch
+                {
+                    Mnemonic.Sarx => BmiInstructionEmulator.Sarx(shiftSrc, (int)shiftCount, size),
+                    Mnemonic.Shlx => BmiInstructionEmulator.Shlx(shiftSrc, (int)shiftCount, size),
+                    _ => BmiInstructionEmulator.Shrx(shiftSrc, (int)shiftCount, size),
+                };
+                return true;
+
+            case Mnemonic.Pdep:
+            case Mnemonic.Pext:
+                if (!TryReadOperand(contextRecord, in instruction, 1, size, out var packSrc) ||
+                    !TryReadOperand(contextRecord, in instruction, 2, size, out var packMask))
+                {
+                    return false;
+                }
+
+                result = instruction.Mnemonic == Mnemonic.Pdep
+                    ? BmiInstructionEmulator.Pdep(packSrc, packMask, size)
+                    : BmiInstructionEmulator.Pext(packSrc, packMask, size);
+                return true;
+
+            default:
+                return false;
+        }
+    }
+
+    private unsafe bool TryReadFaultingInstruction(ulong rip, out Instruction instruction)
+    {
+        // Try the full instruction window first, then shrink so a fault near the end of a mapped
+        // page (where fewer than 15 bytes are readable) still decodes.
+        foreach (var attempt in DecodeWindowSizes)
+        {
+            var buffer = new byte[attempt];
+            if (!TryReadHostBytes(rip, buffer))
+            {
+                continue;
+            }
+
+            var decoder = Decoder.Create(64, new ByteArrayCodeReader(buffer));
+            decoder.IP = rip;
+            decoder.Decode(out instruction);
+            if (instruction.Code != Code.INVALID && instruction.Length > 0 && instruction.Length <= attempt)
+            {
+                return true;
+            }
+        }
+
+        instruction = default;
+        return false;
+    }
+
+    private unsafe bool TryReadOperand(
+        void* contextRecord,
+        in Instruction instruction,
+        int operandIndex,
+        GprOperandSize size,
+        out ulong value)
+    {
+        value = 0;
+        switch (instruction.GetOpKind(operandIndex))
+        {
+            case OpKind.Register:
+                if (!TryGetGprSlot(instruction.GetOpRegister(operandIndex), out var offset, out _))
+                {
+                    return false;
+                }
+
+                var raw = ReadCtxU64(contextRecord, offset);
+                value = size == GprOperandSize.Bits64 ? raw : raw & 0xFFFF_FFFFUL;
+                return true;
+
+            case OpKind.Memory:
+                if (!TryComputeMemoryAddress(contextRecord, in instruction, out var address))
+                {
+                    return false;
+                }
+
+                var byteCount = size == GprOperandSize.Bits64 ? 8 : 4;
+                var buffer = new byte[byteCount];
+                if (!TryReadHostBytes(address, buffer))
+                {
+                    return false;
+                }
+
+                value = byteCount == 8
+                    ? BinaryPrimitives.ReadUInt64LittleEndian(buffer)
+                    : BinaryPrimitives.ReadUInt32LittleEndian(buffer);
+                return true;
+
+            default:
+                return false;
+        }
+    }
+
+    private unsafe bool TryComputeMemoryAddress(void* contextRecord, in Instruction instruction, out ulong address)
+    {
+        address = 0;
+
+        // FS/GS-relative operands need the guest segment base, which is not modelled here.
+        if (instruction.SegmentPrefix != Register.None)
+        {
+            return false;
+        }
+
+        if (instruction.IsIPRelativeMemoryOperand)
+        {
+            address = instruction.IPRelativeMemoryAddress;
+            return true;
+        }
+
+        var effective = instruction.MemoryDisplacement64;
+        if (instruction.MemoryBase != Register.None)
+        {
+            if (!TryGetGpr64Offset(instruction.MemoryBase, out var baseOffset))
+            {
+                return false;
+            }
+
+            effective += ReadCtxU64(contextRecord, baseOffset);
+        }
+
+        if (instruction.MemoryIndex != Register.None)
+        {
+            if (!TryGetGpr64Offset(instruction.MemoryIndex, out var indexOffset))
+            {
+                return false;
+            }
+
+            effective += ReadCtxU64(contextRecord, indexOffset) * (ulong)instruction.MemoryIndexScale;
+        }
+
+        address = effective;
+        return true;
+    }
+
+    // Maps a 32- or 64-bit GPR to its CONTEXT offset and reports the operand width it implies.
+    private static bool TryGetGprSlot(Register register, out int offset, out GprOperandSize size)
+    {
+        switch (register)
+        {
+            case Register.EAX: offset = CTX_RAX; size = GprOperandSize.Bits32; return true;
+            case Register.ECX: offset = CTX_RCX; size = GprOperandSize.Bits32; return true;
+            case Register.EDX: offset = CTX_RDX; size = GprOperandSize.Bits32; return true;
+            case Register.EBX: offset = CTX_RBX; size = GprOperandSize.Bits32; return true;
+            case Register.ESP: offset = CTX_RSP; size = GprOperandSize.Bits32; return true;
+            case Register.EBP: offset = CTX_RBP; size = GprOperandSize.Bits32; return true;
+            case Register.ESI: offset = CTX_RSI; size = GprOperandSize.Bits32; return true;
+            case Register.EDI: offset = CTX_RDI; size = GprOperandSize.Bits32; return true;
+            case Register.R8D: offset = CTX_R8; size = GprOperandSize.Bits32; return true;
+            case Register.R9D: offset = CTX_R9; size = GprOperandSize.Bits32; return true;
+            case Register.R10D: offset = CTX_R10; size = GprOperandSize.Bits32; return true;
+            case Register.R11D: offset = CTX_R11; size = GprOperandSize.Bits32; return true;
+            case Register.R12D: offset = CTX_R12; size = GprOperandSize.Bits32; return true;
+            case Register.R13D: offset = CTX_R13; size = GprOperandSize.Bits32; return true;
+            case Register.R14D: offset = CTX_R14; size = GprOperandSize.Bits32; return true;
+            case Register.R15D: offset = CTX_R15; size = GprOperandSize.Bits32; return true;
+            default:
+                if (TryGetGpr64Offset(register, out offset))
+                {
+                    size = GprOperandSize.Bits64;
+                    return true;
+                }
+
+                size = GprOperandSize.Bits32;
+                return false;
+        }
+    }
+
+    private static bool TryGetGpr64Offset(Register register, out int offset)
+    {
+        switch (register)
+        {
+            case Register.RAX: offset = CTX_RAX; return true;
+            case Register.RCX: offset = CTX_RCX; return true;
+            case Register.RDX: offset = CTX_RDX; return true;
+            case Register.RBX: offset = CTX_RBX; return true;
+            case Register.RSP: offset = CTX_RSP; return true;
+            case Register.RBP: offset = CTX_RBP; return true;
+            case Register.RSI: offset = CTX_RSI; return true;
+            case Register.RDI: offset = CTX_RDI; return true;
+            case Register.R8: offset = CTX_R8; return true;
+            case Register.R9: offset = CTX_R9; return true;
+            case Register.R10: offset = CTX_R10; return true;
+            case Register.R11: offset = CTX_R11; return true;
+            case Register.R12: offset = CTX_R12; return true;
+            case Register.R13: offset = CTX_R13; return true;
+            case Register.R14: offset = CTX_R14; return true;
+            case Register.R15: offset = CTX_R15; return true;
+            default: offset = 0; return false;
+        }
+    }
+}

src/SharpEmu.Core/Cpu/Native/DirectExecutionBackend.NativeWorker.cs

@@ -6,8 +6,6 @@ using System.Collections.Generic;
 using System.Runtime.InteropServices;
 using System.Threading;
 using SharpEmu.HLE;
-using SharpEmu.HLE.Host;
-using SharpEmu.HLE.Host.Posix;
 
 namespace SharpEmu.Core.Cpu.Native;
 
@@ -37,6 +35,20 @@ public sealed partial class DirectExecutionBackend
 	private bool _nativeWorkersDisposed;
 	private int _nativeWorkerCreationFailedLogged;
 
+	private const uint StackSizeParamIsAReservation = 0x00010000u;
+
+	[DllImport("kernel32.dll", SetLastError = true)]
+	private static extern nint CreateThread(
+		nint lpThreadAttributes,
+		nuint dwStackSize,
+		nint lpStartAddress,
+		nint lpParameter,
+		uint dwCreationFlags,
+		out uint lpThreadId);
+
+	[DllImport("kernel32.dll", SetLastError = true)]
+	private static extern uint WaitForSingleObject(nint hHandle, uint dwMilliseconds);
+
 	// Runs an emitted guest entry stub. Preferred path is a pooled native worker
 	// thread; falls back to the historical inline calli (guest frames above this
 	// thread's managed frames) when workers are disabled or unavailable.
@@ -49,7 +61,7 @@ public sealed partial class DirectExecutionBackend
 		var worker = RentNativeGuestExecutor();
 		if (worker is null)
 		{
-			_hostThreading.SetTlsValue(_hostRspSlotTlsIndex, (nint)hostRspSlot);
+			TlsSetValue(_hostRspSlotTlsIndex, (nint)hostRspSlot);
 			return CallNativeEntry(entryStub);
 		}
 		try
@@ -80,7 +92,10 @@ public sealed partial class DirectExecutionBackend
 
 	private NativeGuestExecutor? RentNativeGuestExecutor()
 	{
-		if (NativeGuestWorkersDisabled)
+		// NativeGuestExecutor emits a Win32 wait loop and creates it with
+		// kernel32!CreateThread. POSIX hosts use the established inline entry
+		// path until the worker loop has a pthread/eventfd implementation.
+		if (!OperatingSystem.IsWindows() || NativeGuestWorkersDisabled)
 		{
 			return null;
 		}
@@ -234,7 +249,7 @@ public sealed partial class DirectExecutionBackend
 
 		public static NativeGuestExecutor? TryCreate(DirectExecutionBackend backend)
 		{
-			if (!EnsureHostRuntimeExports(backend._hostSymbols))
+			if (!EnsureKernel32Exports())
 			{
 				return null;
 			}
@@ -247,27 +262,32 @@ public sealed partial class DirectExecutionBackend
 			return executor;
 		}
 
-		private static bool EnsureHostRuntimeExports(IHostSymbolResolver symbols)
+		private static bool EnsureKernel32Exports()
 		{
 			if (_exitThreadAddress != 0)
 			{
 				return _waitForSingleObjectAddress != 0 && _setEventAddress != 0;
 			}
-			_waitForSingleObjectAddress = symbols.GetAddress(HostRuntimeFunction.WaitForSingleObject);
-			_setEventAddress = symbols.GetAddress(HostRuntimeFunction.SetEvent);
-			_exitThreadAddress = symbols.GetAddress(HostRuntimeFunction.ExitThread);
+			nint kernel32 = GetModuleHandle("kernel32.dll");
+			if (kernel32 == 0)
+			{
+				return false;
+			}
+			_waitForSingleObjectAddress = GetProcAddress(kernel32, "WaitForSingleObject");
+			_setEventAddress = GetProcAddress(kernel32, "SetEvent");
+			_exitThreadAddress = GetProcAddress(kernel32, "ExitThread");
 			return _waitForSingleObjectAddress != 0 && _setEventAddress != 0 && _exitThreadAddress != 0;
 		}
 
 		private bool Initialize()
 		{
 			_selfHandle = GCHandle.Alloc(this);
-			_controlBlock = (void*)_backend._hostMemory.Allocate(0, 4096u, HostPageProtection.ReadWrite);
+			_controlBlock = VirtualAlloc(null, 4096u, 12288u, 4u);
 			if (_controlBlock == null)
 			{
 				return false;
 			}
-			_loopStub = (void*)_backend._hostMemory.Allocate(0, LoopStubSize, HostPageProtection.ReadWriteExecute);
+			_loopStub = VirtualAlloc(null, LoopStubSize, 12288u, 64u);
 			if (_loopStub == null)
 			{
 				return false;
@@ -375,15 +395,17 @@ public sealed partial class DirectExecutionBackend
 			*(int*)(code + skipJump) = skipEntryOffset - (skipJump + sizeof(int));
 
 			uint oldProtect = 0;
-			if (!_backend._hostMemory.Protect((ulong)_loopStub, LoopStubSize, HostPageProtection.ReadExecute, out oldProtect))
+			if (!VirtualProtect(_loopStub, LoopStubSize, 32u, &oldProtect))
 			{
 				return false;
 			}
-			_backend._hostMemory.FlushInstructionCache((ulong)_loopStub, LoopStubSize);
-			_threadHandle = _backend._hostThreading.CreateNativeThread(
-				(nint)_loopStub,
+			FlushInstructionCache(GetCurrentProcess(), _loopStub, LoopStubSize);
+			_threadHandle = CreateThread(
 				0,
 				WorkerStackReservation,
+				(nint)_loopStub,
+				0,
+				StackSizeParamIsAReservation,
 				out _nativeThreadId);
 			if (_threadHandle == 0)
 			{
@@ -511,7 +533,7 @@ public sealed partial class DirectExecutionBackend
 			_prevYieldRequested = _activeGuestThreadYieldRequested;
 			_prevYieldReason = _activeGuestThreadYieldReason;
 			_prevState = _activeGuestThreadState;
-			_prevHostRspSlot = backend._hostThreading.GetTlsValue(backend._hostRspSlotTlsIndex);
+			_prevHostRspSlot = TlsGetValue(backend._hostRspSlotTlsIndex);
 			_prevGuestThreadHandle = GuestThreadExecution.EnterGuestThread(_runGuestThreadHandle);
 			_entered = true;
 			_activeExecutionBackend = backend;
@@ -523,11 +545,11 @@ public sealed partial class DirectExecutionBackend
 			_activeGuestThreadYieldReason = null;
 			_activeGuestThreadState = _runState;
 			backend.BindTlsBase(_runContext!);
-			backend._hostThreading.SetTlsValue(backend._hostRspSlotTlsIndex, _runHostRspSlot);
+			TlsSetValue(backend._hostRspSlotTlsIndex, _runHostRspSlot);
 			if (_runState is { } state)
 			{
 				_prevHostThreadId = Volatile.Read(ref state.HostThreadId);
-				Volatile.Write(ref state.HostThreadId, unchecked((int)backend._hostThreading.CurrentThreadId));
+				Volatile.Write(ref state.HostThreadId, unchecked((int)GetCurrentThreadId()));
 			}
 			if (_runAffinityMask != 0)
 			{
@@ -557,7 +579,7 @@ public sealed partial class DirectExecutionBackend
 			{
 				Volatile.Write(ref state.HostThreadId, _prevHostThreadId);
 			}
-			_backend._hostThreading.SetTlsValue(_backend._hostRspSlotTlsIndex, _prevHostRspSlot);
+			TlsSetValue(_backend._hostRspSlotTlsIndex, _prevHostRspSlot);
 			GuestThreadExecution.RestoreGuestThread(_prevGuestThreadHandle);
 			_activeExecutionBackend = _prevBackend;
 			_activeCpuContext = _prevContext;
@@ -594,8 +616,8 @@ public sealed partial class DirectExecutionBackend
 			var exited = _threadHandle == 0;
 			if (_threadHandle != 0)
 			{
-				exited = _backend._hostThreading.WaitForThreadExit(_threadHandle, 1000u);
-				_backend._hostThreading.CloseThreadHandle(_threadHandle);
+				exited = WaitForSingleObject(_threadHandle, 1000u) == 0u;
+				CloseHandle(_threadHandle);
 				_threadHandle = 0;
 			}
 			if (!exited)
@@ -609,12 +631,12 @@ public sealed partial class DirectExecutionBackend
 			}
 			if (_loopStub != null)
 			{
-				_backend._hostMemory.Free((ulong)_loopStub);
+				VirtualFree(_loopStub, 0u, 32768u);
 				_loopStub = null;
 			}
 			if (_controlBlock != null)
 			{
-				_backend._hostMemory.Free((ulong)_controlBlock);
+				VirtualFree(_controlBlock, 0u, 32768u);
 				_controlBlock = null;
 			}
 			if (_selfHandle.IsAllocated)

src/SharpEmu.Core/Cpu/Native/DirectExecutionBackend.PosixSignals.cs

@@ -4,7 +4,7 @@
 using System;
 using System.Runtime.InteropServices;
 using System.Threading;
-using SharpEmu.Core.Cpu.Native.Windows;
+using SharpEmu.HLE;
 
 namespace SharpEmu.Core.Cpu.Native;
 
@@ -21,6 +21,8 @@ public sealed unsafe partial class DirectExecutionBackend
 	// runtime keeps turning its own faults into managed exceptions.
 
 	private const int PosixSigIll = 4;
+	private const int PosixSigTrap = 5;
+	private const int PosixSigAbort = 6;
 	private const int PosixSigSegv = 11;
 	private static readonly int PosixSigBus = OperatingSystem.IsMacOS() ? 10 : 7;
 
@@ -62,6 +64,9 @@ public sealed unsafe partial class DirectExecutionBackend
 	private static bool _posixSignalWarmup;
 	private static readonly nint[] _posixPreviousActions = new nint[32];
 	private static int _posixSignalTraceCount;
+	private static long _perfSignalCount;
+	private static readonly bool _perfSignalCounter =
+		string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_PERF_MEM"), "1", StringComparison.Ordinal);
 
 	[ThreadStatic]
 	private static int _posixSignalHandlerDepth;
@@ -88,10 +93,13 @@ public sealed unsafe partial class DirectExecutionBackend
 		}
 
 		WarmUpPosixSignalPath();
+		SharpEmu.HLE.GuestImageWriteTracker.WarmUp();
 
 		if (!InstallPosixSignalHandler(PosixSigSegv) ||
 			!InstallPosixSignalHandler(PosixSigBus) ||
-			!InstallPosixSignalHandler(PosixSigIll))
+			!InstallPosixSignalHandler(PosixSigIll) ||
+			!InstallPosixSignalHandler(PosixSigTrap) ||
+			!InstallPosixSignalHandler(PosixSigAbort))
 		{
 			throw new InvalidOperationException("Failed to install POSIX fault signal handlers");
 		}
@@ -132,8 +140,8 @@ public sealed unsafe partial class DirectExecutionBackend
 			// action and sigaction(0, ...) fails with EINVAL).
 			EXCEPTION_RECORD record = default;
 			record.ExceptionCode = DBG_PRINTEXCEPTION_C;
-			byte* contextRecord = stackalloc byte[Win64ContextOffsets.Size];
-			new Span<byte>(contextRecord, Win64ContextOffsets.Size).Clear();
+			byte* contextRecord = stackalloc byte[Win64ContextSize];
+			new Span<byte>(contextRecord, Win64ContextSize).Clear();
 			EXCEPTION_POINTERS pointers;
 			pointers.ExceptionRecord = &record;
 			pointers.ContextRecord = contextRecord;
@@ -190,8 +198,27 @@ public sealed unsafe partial class DirectExecutionBackend
 		}
 
 		_posixSignalHandlerDepth++;
+		if (_perfSignalCounter)
+		{
+			var n = Interlocked.Increment(ref _perfSignalCount);
+			if (n % 100000 == 0)
+			{
+				Console.Error.WriteLine($"[PERF][MEM] posix_faults={n}");
+			}
+		}
 		try
 		{
+			// Guest-image write tracking runs first: it only needs the fault
+			// address (safe for host and guest threads alike) and must resume
+			// the faulting write immediately after restoring write access.
+			if (signal != PosixSigIll &&
+				siginfo != 0 &&
+				SharpEmu.HLE.GuestImageWriteTracker.TryHandleWriteFault(
+					*(ulong*)((byte*)siginfo + PosixSigInfoAddressOffset)))
+			{
+				return;
+			}
+
 			if (TryHandlePosixFault(signal, siginfo, ucontext))
 			{
 				return;
@@ -217,8 +244,8 @@ public sealed unsafe partial class DirectExecutionBackend
 			return false;
 		}
 
-		byte* contextRecord = stackalloc byte[Win64ContextOffsets.Size];
-		new Span<byte>(contextRecord, Win64ContextOffsets.Size).Clear();
+		byte* contextRecord = stackalloc byte[Win64ContextSize];
+		new Span<byte>(contextRecord, Win64ContextSize).Clear();
 		int[] offsets = PosixRegisterOffsets;
 		for (int i = 0; i < offsets.Length; i++)
 		{
@@ -231,6 +258,14 @@ public sealed unsafe partial class DirectExecutionBackend
 		{
 			record.ExceptionCode = 3221225501u;
 		}
+		else if (signal == PosixSigTrap)
+		{
+			record.ExceptionCode = 2147483651u;
+		}
+		else if (signal == PosixSigAbort)
+		{
+			record.ExceptionCode = 1073741845u;
+		}
 		else
 		{
 			ulong faultAddress = GetPosixFaultAddress(siginfo, registers);

src/SharpEmu.Core/Cpu/Native/PosixHostStubs.cs

@@ -0,0 +1,425 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Runtime.InteropServices;
+using SharpEmu.HLE;
+
+namespace SharpEmu.Core.Cpu.Native;
+
+/// <summary>
+/// POSIX replacements for the kernel32 helpers the native backend embeds in
+/// emitted x86-64 code. Every stub exposed here follows the Win64 calling
+/// convention the emitted call sites were written for (first argument in
+/// ECX, result in RAX, Win64 non-volatile registers preserved), so the
+/// emission code stays identical across platforms.
+/// </summary>
+internal static unsafe class PosixHostStubs
+{
+    private static readonly object Gate = new();
+    private static bool _initialized;
+    private static nint _tlsGetValueStub;
+    private static nint _queryPerformanceCounterStub;
+    private static nint _switchToThreadStub;
+    private static nint _sleepStub;
+
+    public static nint TlsGetValueStubAddress
+    {
+        get { EnsureInitialized(); return _tlsGetValueStub; }
+    }
+
+    public static nint QueryPerformanceCounterStubAddress
+    {
+        get { EnsureInitialized(); return _queryPerformanceCounterStub; }
+    }
+
+    public static nint SwitchToThreadStubAddress
+    {
+        get { EnsureInitialized(); return _switchToThreadStub; }
+    }
+
+    public static nint SleepStubAddress
+    {
+        get { EnsureInitialized(); return _sleepStub; }
+    }
+
+    public static nint CreateWorkerEvent()
+    {
+        if (OperatingSystem.IsMacOS())
+        {
+            return dispatch_semaphore_create(0);
+        }
+
+        var semaphore = Marshal.AllocHGlobal(64);
+        if (sem_init(semaphore, 0, 0) != 0)
+        {
+            Marshal.FreeHGlobal(semaphore);
+            return 0;
+        }
+
+        return semaphore;
+    }
+
+    public static bool SignalWorkerEvent(nint handle)
+    {
+        if (OperatingSystem.IsMacOS())
+        {
+            _ = dispatch_semaphore_signal(handle);
+            return true;
+        }
+
+        return sem_post(handle) == 0;
+    }
+
+    public static bool WaitWorkerEvent(nint handle, int timeoutMilliseconds)
+    {
+        if (OperatingSystem.IsMacOS())
+        {
+            if (timeoutMilliseconds < 0)
+            {
+                return dispatch_semaphore_wait(handle, ulong.MaxValue) == 0;
+            }
+
+            var deadline = dispatch_time(0, timeoutMilliseconds * 1_000_000L);
+            return dispatch_semaphore_wait(handle, deadline) == 0;
+        }
+
+        if (timeoutMilliseconds < 0)
+        {
+            while (sem_wait(handle) != 0)
+            {
+            }
+
+            return true;
+        }
+
+        var deadlineTicks = Environment.TickCount64 + timeoutMilliseconds;
+        while (sem_trywait(handle) != 0)
+        {
+            if (Environment.TickCount64 >= deadlineTicks)
+            {
+                return false;
+            }
+
+            Thread.Sleep(1);
+        }
+
+        return true;
+    }
+
+    public static void DestroyWorkerEvent(nint handle)
+    {
+        if (handle == 0)
+        {
+            return;
+        }
+
+        if (OperatingSystem.IsMacOS())
+        {
+            dispatch_release(handle);
+            return;
+        }
+
+        _ = sem_destroy(handle);
+        Marshal.FreeHGlobal(handle);
+    }
+
+    /// <summary>Allocates a pthread TLS key, mirroring kernel32!TlsAlloc.</summary>
+    public static uint TlsAlloc()
+    {
+        if (OperatingSystem.IsMacOS())
+        {
+            nuint key;
+            return pthread_key_create_mac(&key, 0) == 0 ? (uint)key : uint.MaxValue;
+        }
+
+        uint key32;
+        return pthread_key_create_linux(&key32, 0) == 0 ? key32 : uint.MaxValue;
+    }
+
+    public static bool TlsFree(uint key)
+    {
+        return OperatingSystem.IsMacOS()
+            ? pthread_key_delete_mac((nuint)key) == 0
+            : pthread_key_delete_linux(key) == 0;
+    }
+
+    public static bool TlsSetValue(uint key, nint value)
+    {
+        return OperatingSystem.IsMacOS()
+            ? pthread_setspecific_mac((nuint)key, value) == 0
+            : pthread_setspecific_linux(key, value) == 0;
+    }
+
+    public static nint TlsGetValue(uint key)
+    {
+        return OperatingSystem.IsMacOS()
+            ? pthread_getspecific_mac((nuint)key)
+            : pthread_getspecific_linux(key);
+    }
+
+    /// <summary>Stable numeric id of the calling thread (kernel32!GetCurrentThreadId).</summary>
+    public static uint GetCurrentThreadId()
+    {
+        if (OperatingSystem.IsMacOS())
+        {
+            ulong tid;
+            return pthread_threadid_np(0, &tid) == 0 ? unchecked((uint)tid) : 0u;
+        }
+
+        return unchecked((uint)gettid());
+    }
+
+    /// <summary>
+    /// Wraps a managed callback (compiled for the SysV ABI on POSIX .NET) in a
+    /// thunk that accepts up to four integer arguments in the Win64 ABI the
+    /// emitted x86-64 call sites use. Win64 passes args in rcx/rdx/r8/r9 and
+    /// treats rdi/rsi as non-volatile; SysV expects rdi/rsi/rdx/rcx and
+    /// clobbers them, so the thunk saves rdi/rsi, shuffles the registers, keeps
+    /// the stack 16-byte aligned for the call, and forwards the rax result.
+    /// </summary>
+    public static nint CreateWin64ToSysVThunk(nint sysvTarget)
+    {
+        var page = (byte*)HostMemory.Alloc(
+            null,
+            4096,
+            HostMemory.MEM_COMMIT | HostMemory.MEM_RESERVE,
+            HostMemory.PAGE_EXECUTE_READWRITE);
+        if (page == null)
+        {
+            throw new OutOfMemoryException("Failed to allocate Win64->SysV thunk page");
+        }
+
+        var offset = 0;
+        Emit(page, ref offset, 0x57);                   // push rdi
+        Emit(page, ref offset, 0x56);                   // push rsi
+        Emit(page, ref offset, 0x48, 0x89, 0xCF);       // mov rdi, rcx
+        Emit(page, ref offset, 0x48, 0x89, 0xD6);       // mov rsi, rdx
+        Emit(page, ref offset, 0x4C, 0x89, 0xC2);       // mov rdx, r8
+        Emit(page, ref offset, 0x4C, 0x89, 0xC9);       // mov rcx, r9
+        Emit(page, ref offset, 0x48, 0x83, 0xEC, 0x08); // sub rsp, 8 (realign to 16)
+        EmitMovRaxImm64(page, ref offset, sysvTarget);  // mov rax, target
+        Emit(page, ref offset, 0xFF, 0xD0);             // call rax
+        Emit(page, ref offset, 0x48, 0x83, 0xC4, 0x08); // add rsp, 8
+        Emit(page, ref offset, 0x5E);                   // pop rsi
+        Emit(page, ref offset, 0x5F);                   // pop rdi
+        Emit(page, ref offset, 0xC3);                   // ret
+
+        if (!HostMemory.Protect(page, 4096, HostMemory.PAGE_EXECUTE_READ, out _))
+        {
+            throw new InvalidOperationException("Failed to protect Win64->SysV thunk page");
+        }
+
+        HostMemory.FlushInstructionCache(page, (nuint)offset);
+        return (nint)page;
+    }
+
+    private static void EnsureInitialized()
+    {
+        if (_initialized)
+        {
+            return;
+        }
+
+        lock (Gate)
+        {
+            if (_initialized)
+            {
+                return;
+            }
+
+            BuildStubs();
+            _initialized = true;
+        }
+    }
+
+    private static void BuildStubs()
+    {
+        var page = (byte*)HostMemory.Alloc(
+            null,
+            4096,
+            HostMemory.MEM_COMMIT | HostMemory.MEM_RESERVE,
+            HostMemory.PAGE_EXECUTE_READWRITE);
+        if (page == null)
+        {
+            throw new OutOfMemoryException("Failed to allocate POSIX host helper stub page");
+        }
+
+        var offset = 0;
+        _tlsGetValueStub = EmitTlsGetValue(page, ref offset);
+        _queryPerformanceCounterStub = EmitQueryPerformanceCounter(page, ref offset);
+        _switchToThreadStub = EmitSwitchToThread(page, ref offset);
+        _sleepStub = EmitSleep(page, ref offset);
+
+        if (!HostMemory.Protect(page, 4096, HostMemory.PAGE_EXECUTE_READ, out _))
+        {
+            throw new InvalidOperationException("Failed to protect POSIX host helper stub page");
+        }
+
+        HostMemory.FlushInstructionCache(page, (nuint)offset);
+    }
+
+    private static nint EmitTlsGetValue(byte* page, ref int offset)
+    {
+        var start = (nint)(page + offset);
+        if (OperatingSystem.IsMacOS())
+        {
+            // On macOS x86-64 pthread keys index the gs-based thread specific
+            // data array directly, so TlsGetValue(index in ecx) collapses to a
+            // single load that clobbers nothing but RAX.
+            Emit(page, ref offset, 0x89, 0xC8);                                     // mov eax, ecx
+            Emit(page, ref offset, 0x65, 0x48, 0x8B, 0x04, 0xC5, 0, 0, 0, 0);       // mov rax, gs:[rax*8]
+            Emit(page, ref offset, 0xC3);                                           // ret
+            return start;
+        }
+
+        // Linux: call pthread_getspecific, preserving the registers that are
+        // volatile in SysV but non-volatile in Win64 (rsi, rdi).
+        var pthreadGetSpecific = ResolveLibcExport("pthread_getspecific");
+        Emit(page, ref offset, 0x56);                                               // push rsi
+        Emit(page, ref offset, 0x57);                                               // push rdi
+        Emit(page, ref offset, 0x48, 0x83, 0xEC, 0x08);                             // sub rsp, 8
+        Emit(page, ref offset, 0x89, 0xCF);                                         // mov edi, ecx
+        EmitMovRaxImm64(page, ref offset, pthreadGetSpecific);                      // mov rax, imm64
+        Emit(page, ref offset, 0xFF, 0xD0);                                         // call rax
+        Emit(page, ref offset, 0x48, 0x83, 0xC4, 0x08);                             // add rsp, 8
+        Emit(page, ref offset, 0x5F);                                               // pop rdi
+        Emit(page, ref offset, 0x5E);                                               // pop rsi
+        Emit(page, ref offset, 0xC3);                                               // ret
+        return start;
+    }
+
+    private static nint EmitQueryPerformanceCounter(byte* page, ref int offset)
+    {
+        // BOOL QueryPerformanceCounter(LARGE_INTEGER* out in rcx): the emitted
+        // consumers only need a monotonically increasing counter, which rdtsc
+        // provides without leaving Win64-safe registers.
+        var start = (nint)(page + offset);
+        Emit(page, ref offset, 0x0F, 0x31);                                         // rdtsc
+        Emit(page, ref offset, 0x48, 0xC1, 0xE2, 0x20);                             // shl rdx, 32
+        Emit(page, ref offset, 0x48, 0x09, 0xD0);                                   // or rax, rdx
+        Emit(page, ref offset, 0x48, 0x89, 0x01);                                   // mov [rcx], rax
+        Emit(page, ref offset, 0xB8, 0x01, 0x00, 0x00, 0x00);                       // mov eax, 1
+        Emit(page, ref offset, 0xC3);                                               // ret
+        return start;
+    }
+
+    private static nint EmitSwitchToThread(byte* page, ref int offset)
+    {
+        var schedYield = ResolveLibcExport("sched_yield");
+        var start = (nint)(page + offset);
+        Emit(page, ref offset, 0x56);                                               // push rsi
+        Emit(page, ref offset, 0x57);                                               // push rdi
+        Emit(page, ref offset, 0x48, 0x83, 0xEC, 0x08);                             // sub rsp, 8
+        EmitMovRaxImm64(page, ref offset, schedYield);                              // mov rax, imm64
+        Emit(page, ref offset, 0xFF, 0xD0);                                         // call rax
+        Emit(page, ref offset, 0x48, 0x83, 0xC4, 0x08);                             // add rsp, 8
+        Emit(page, ref offset, 0x5F);                                               // pop rdi
+        Emit(page, ref offset, 0x5E);                                               // pop rsi
+        Emit(page, ref offset, 0xB8, 0x01, 0x00, 0x00, 0x00);                       // mov eax, 1
+        Emit(page, ref offset, 0xC3);                                               // ret
+        return start;
+    }
+
+    private static nint EmitSleep(byte* page, ref int offset)
+    {
+        // void Sleep(DWORD milliseconds in ecx) -> usleep(microseconds in edi).
+        var usleep = ResolveLibcExport("usleep");
+        var start = (nint)(page + offset);
+        Emit(page, ref offset, 0x56);                                               // push rsi
+        Emit(page, ref offset, 0x57);                                               // push rdi
+        Emit(page, ref offset, 0x48, 0x83, 0xEC, 0x08);                             // sub rsp, 8
+        Emit(page, ref offset, 0x89, 0xCF);                                         // mov edi, ecx
+        Emit(page, ref offset, 0x81, 0xFF, 0xFF, 0x0F, 0x00, 0x00);                 // cmp edi, 0xFFF
+        Emit(page, ref offset, 0x76, 0x05);                                         // jbe +5
+        Emit(page, ref offset, 0xBF, 0xFF, 0x0F, 0x00, 0x00);                       // mov edi, 0xFFF (cap at ~4s)
+        Emit(page, ref offset, 0x69, 0xFF, 0xE8, 0x03, 0x00, 0x00);                 // imul edi, edi, 1000
+        EmitMovRaxImm64(page, ref offset, usleep);                                  // mov rax, imm64
+        Emit(page, ref offset, 0xFF, 0xD0);                                         // call rax
+        Emit(page, ref offset, 0x48, 0x83, 0xC4, 0x08);                             // add rsp, 8
+        Emit(page, ref offset, 0x5F);                                               // pop rdi
+        Emit(page, ref offset, 0x5E);                                               // pop rsi
+        Emit(page, ref offset, 0xC3);                                               // ret
+        return start;
+    }
+
+    private static nint ResolveLibcExport(string name)
+    {
+        var libc = NativeLibrary.Load(OperatingSystem.IsMacOS() ? "libSystem.dylib" : "libc.so.6");
+        return NativeLibrary.GetExport(libc, name);
+    }
+
+    private static void Emit(byte* page, ref int offset, params byte[] bytes)
+    {
+        foreach (var value in bytes)
+        {
+            page[offset++] = value;
+        }
+    }
+
+    private static void EmitMovRaxImm64(byte* page, ref int offset, nint value)
+    {
+        Emit(page, ref offset, 0x48, 0xB8);
+        *(long*)(page + offset) = value;
+        offset += sizeof(long);
+    }
+
+    [DllImport("libc", EntryPoint = "pthread_key_create", SetLastError = true)]
+    private static extern int pthread_key_create_mac(nuint* key, nint destructor);
+
+    [DllImport("libc", EntryPoint = "pthread_key_create", SetLastError = true)]
+    private static extern int pthread_key_create_linux(uint* key, nint destructor);
+
+    [DllImport("libc", EntryPoint = "pthread_key_delete")]
+    private static extern int pthread_key_delete_mac(nuint key);
+
+    [DllImport("libc", EntryPoint = "pthread_key_delete")]
+    private static extern int pthread_key_delete_linux(uint key);
+
+    [DllImport("libc", EntryPoint = "pthread_setspecific")]
+    private static extern int pthread_setspecific_mac(nuint key, nint value);
+
+    [DllImport("libc", EntryPoint = "pthread_setspecific")]
+    private static extern int pthread_setspecific_linux(uint key, nint value);
+
+    [DllImport("libc", EntryPoint = "pthread_getspecific")]
+    private static extern nint pthread_getspecific_mac(nuint key);
+
+    [DllImport("libc", EntryPoint = "pthread_getspecific")]
+    private static extern nint pthread_getspecific_linux(uint key);
+
+    [DllImport("libc")]
+    private static extern int pthread_threadid_np(nint thread, ulong* threadId);
+
+    [DllImport("libc")]
+    private static extern int gettid();
+
+    [DllImport("libc")]
+    private static extern nint dispatch_semaphore_create(long value);
+
+    [DllImport("libc")]
+    private static extern nint dispatch_semaphore_signal(nint semaphore);
+
+    [DllImport("libc")]
+    private static extern nint dispatch_semaphore_wait(nint semaphore, ulong timeout);
+
+    [DllImport("libc")]
+    private static extern ulong dispatch_time(ulong when, long deltaNanoseconds);
+
+    [DllImport("libc")]
+    private static extern void dispatch_release(nint handle);
+
+    [DllImport("libc")]
+    private static extern int sem_init(nint semaphore, int shared, uint value);
+
+    [DllImport("libc")]
+    private static extern int sem_post(nint semaphore);
+
+    [DllImport("libc")]
+    private static extern int sem_wait(nint semaphore);
+
+    [DllImport("libc")]
+    private static extern int sem_trywait(nint semaphore);
+
+    [DllImport("libc")]
+    private static extern int sem_destroy(nint semaphore);
+}

src/SharpEmu.Core/Cpu/Native/StubManager.cs

@@ -3,7 +3,6 @@
 
 using System.Runtime.InteropServices;
 using SharpEmu.HLE;
-using SharpEmu.HLE.Host;
 
 namespace SharpEmu.Core.Cpu.Native;
 
@@ -12,15 +11,17 @@ public sealed unsafe class StubManager : IDisposable
     private readonly List<nint> _allocatedStubs = new();
     private readonly Dictionary<string, nint> _importHandlers = new();
     private readonly Dictionary<ulong, nint> _stubAddresses = new();
-    private readonly IHostMemory _hostMemory;
     private byte* _pltMemory;
     private int _pltOffset;
     private const int PltMemorySize = 1024 * 1024; // 1MB for stubs
 
-    public StubManager(IHostMemory? hostMemory = null)
+    public StubManager()
     {
-        _hostMemory = hostMemory ?? HostPlatform.Current.Memory;
-        _pltMemory = (byte*)_hostMemory.Allocate(0, PltMemorySize, HostPageProtection.ReadWriteExecute);
+        _pltMemory = (byte*)VirtualAlloc(
+            null,
+            (nuint)PltMemorySize,
+            AllocationType.Reserve | AllocationType.Commit,
+            MemoryProtection.ExecuteReadWrite);
 
         if (_pltMemory == null)
         {
@@ -184,7 +185,7 @@ public sealed unsafe class StubManager : IDisposable
     {
         if (_pltMemory != null)
         {
-            _hostMemory.Free((ulong)_pltMemory);
+            VirtualFree(_pltMemory, 0, FreeType.Release);
             _pltMemory = null;
         }
 
@@ -193,5 +194,29 @@ public sealed unsafe class StubManager : IDisposable
         _stubAddresses.Clear();
     }
 
+    private static void* VirtualAlloc(void* lpAddress, nuint dwSize, AllocationType flAllocationType, MemoryProtection flProtect) =>
+        HostMemory.Alloc(lpAddress, dwSize, (uint)flAllocationType, (uint)flProtect);
+
+    private static bool VirtualFree(void* lpAddress, nuint dwSize, FreeType dwFreeType) =>
+        HostMemory.Free(lpAddress, dwSize, (uint)dwFreeType);
+
+    [Flags]
+    private enum AllocationType : uint
+    {
+        Commit = 0x1000,
+        Reserve = 0x2000,
+    }
+
+    [Flags]
+    private enum MemoryProtection : uint
+    {
+        ExecuteReadWrite = 0x40,
+    }
+
+    private enum FreeType : uint
+    {
+        Release = 0x8000,
+    }
+
     public delegate void ImportHandler(CpuContext context);
 }

src/SharpEmu.Core/Loader/ProgramHeader.cs

@@ -48,6 +48,8 @@ public enum ProgramHeaderType : uint
 
     Tls = 7,
 
+    GnuEhFrame = 0x6474E550,
+
     SceRela = 0x60000000,
 
     SceProcParam = 0x61000001,

src/SharpEmu.Core/Loader/SelfImage.cs

@@ -24,7 +24,10 @@ public sealed class SelfImage
         ulong procParamAddress = 0,
         string? title = null,
         string? titleId = null,
-        string? version = null)
+        string? version = null,
+        uint tlsModuleId = 0,
+        ulong tlsMemorySize = 0,
+        ulong tlsStaticOffset = 0)
     {
         ArgumentNullException.ThrowIfNull(programHeaders);
         ArgumentNullException.ThrowIfNull(mappedRegions);
@@ -44,6 +47,9 @@ public sealed class SelfImage
         Title = title;
         TitleId = titleId;
         Version = version;
+        TlsModuleId = tlsModuleId;
+        TlsMemorySize = tlsMemorySize;
+        TlsStaticOffset = tlsStaticOffset;
     }
 
     public bool IsSelf { get; }
@@ -75,4 +81,11 @@ public sealed class SelfImage
     public string? TitleId { get; }
 
     public string? Version { get; }
+
+    public uint TlsModuleId { get; }
+
+    public ulong TlsMemorySize { get; }
+
+    /// <summary>Variant II distance from the thread pointer to this module's static TLS base.</summary>
+    public ulong TlsStaticOffset { get; }
 }

src/SharpEmu.Core/Loader/SelfLoader.cs

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 using System.Buffers.Binary;
+using System.Diagnostics;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Text;
@@ -10,16 +11,14 @@ using SharpEmu.Core;
 using SharpEmu.Core.Cpu;
 using SharpEmu.Core.Memory;
 using SharpEmu.HLE;
-using SharpEmu.Logging;
 
 namespace SharpEmu.Core.Loader;
 
 public sealed class SelfLoader : ISelfLoader
 {
-    private static readonly SharpEmuLogger Log = SharpEmuLog.For("Loader");
     private const uint ElfMagic = 0x7F454C46;
-    private const uint Ps4SelfMagic  = 0x4F153D1D;
-    private const uint Ps5SelfMagic  = 0x5414F5EE;
+    private const uint Ps4SelfMagic = 0x4F153D1D;
+    private const uint Ps5SelfMagic = 0x5414F5EE;
     private const ulong SelfSegmentFlag = 0x800;
     private const int PageSize = 0x1000;
     private const ulong ImportStubBaseAddress = 0x0000_7000_0000_0000UL;
@@ -58,11 +57,22 @@ public sealed class SelfLoader : ISelfLoader
     private const long DtSceSymTab = 0x61000039;
     private const long DtSceSymTabSize = 0x6100003F;
 
+    private const uint RelocationTypeNone = 0;
     private const uint RelocationTypeAbsolute64 = 1;
+    private const uint RelocationTypePc32 = 2;
+    private const uint RelocationTypePlt32 = 4;
     private const uint RelocationTypeGlobalData = 6;
     private const uint RelocationTypeJumpSlot = 7;
     private const uint RelocationTypeRelative = 8;
-    private const uint RelocationTypeTlsModuleId = 16;
+    private const uint RelocationTypeUnsigned32 = 10;
+    private const uint RelocationTypeSigned32 = 11;
+    private const uint RelocationTypeTlsModuleId = 16;   // R_X86_64_DTPMOD64
+    private const uint RelocationTypeTlsDtpOff64 = 17;    // R_X86_64_DTPOFF64
+    private const uint RelocationTypeTlsTpOff64 = 18;     // R_X86_64_TPOFF64
+    private const uint RelocationTypePc64 = 24;
+    private const uint RelocationTypeSize32 = 32;
+    private const uint RelocationTypeSize64 = 33;
+    private const uint RelocationTypeRelative64 = 38;
     private const ulong Ps5MainImageBase = 0x0000000800000000UL;
     private const ulong Ps4MainImageBase = 0x0000000000400000UL;
     private const ulong Ps5ModuleSearchStart = 0x0000000804000000UL;
@@ -88,6 +98,11 @@ public sealed class SelfLoader : ISelfLoader
     private static readonly int SelfSegmentSize = Unsafe.SizeOf<SelfSegment>();
     private static readonly int ProgramHeaderSize = Unsafe.SizeOf<ProgramHeader>();
 
+    static SelfLoader()
+    {
+        RunRelocationSelfChecks();
+    }
+
     public SelfImage Load(ReadOnlySpan<byte> imageData, IVirtualMemory virtualMemory)
     {
         return Load(imageData, virtualMemory, fs: null, mountRoot: null);
@@ -156,16 +171,22 @@ public sealed class SelfLoader : ISelfLoader
         {
             virtualMemory.Clear();
             _nextTlsModuleId = 1;
+            GuestTlsTemplate.Reset();
         }
 
-        var tlsModuleId = _nextTlsModuleId == 0 ? 1u : _nextTlsModuleId;
-        Log.Debug($"TLS load_start clear={clearVirtualMemory} next={_nextTlsModuleId} assigned={tlsModuleId}");
-
         var loadContext = ParseLayout(imageData);
         var elfHeader = ReadUnmanaged<ElfHeader>(imageData, loadContext.ElfOffset);
         ValidateElfHeader(elfHeader);
 
         var programHeaders = ParseProgramHeaders(imageData, loadContext, elfHeader);
+        var hasTlsSegment = TryGetProgramHeader(programHeaders, ProgramHeaderType.Tls, out var processTlsHeader, out _) &&
+            processTlsHeader.MemorySize != 0;
+        var tlsModuleId = hasTlsSegment
+            ? (_nextTlsModuleId == 0 ? 1u : _nextTlsModuleId)
+            : 0u;
+        Console.Error.WriteLine(
+            $"[LOADER][TLS] load_start clear={clearVirtualMemory} next={_nextTlsModuleId} " +
+            $"assigned={tlsModuleId} has_pt_tls={hasTlsSegment}");
 
         var totalImageSize = CalculateTotalImageSize(programHeaders);
         Console.WriteLine($"Total image size needed: 0x{totalImageSize:X} ({totalImageSize} bytes)");
@@ -178,8 +199,9 @@ public sealed class SelfLoader : ISelfLoader
             {
                 if (!physicalVm.TryAllocateAtExact(imageBase, totalImageSize, executable: true, out var allocatedBase))
                 {
+                    var reason = physicalVm.DescribeAddressForDiagnostics(imageBase);
                     throw new InvalidOperationException(
-                        $"Could not allocate main image at required base 0x{imageBase:X16} (size=0x{totalImageSize:X}).");
+                        $"Could not allocate main image at required base 0x{imageBase:X16} (size=0x{totalImageSize:X}): {reason}.");
                 }
 
                 imageBase = allocatedBase;
@@ -198,6 +220,13 @@ public sealed class SelfLoader : ISelfLoader
         }
 
         MapLoadSegments(imageData, loadContext, programHeaders, virtualMemory, imageBase);
+        // Register every module before relocations so DTPMOD/DTPOFF/TPOFF use
+        // the module's real PT_TLS identity and Variant II static offset.
+        var tlsInfo = RegisterModuleTlsTemplate(
+            programHeaders,
+            virtualMemory,
+            imageBase,
+            tlsModuleId);
         var importStubs = ResolveAndPatchImportStubs(
             imageData,
             loadContext,
@@ -255,11 +284,11 @@ public sealed class SelfLoader : ISelfLoader
             Console.WriteLine($"[LOADER] PH[{i}]: type={ph.HeaderType}, vaddr=0x{ph.VirtualAddress:X16} -> 0x{ph.VirtualAddress + imageBase:X16}, memsz=0x{ph.MemorySize:X}");
         }
 
-        if (_nextTlsModuleId == tlsModuleId && _nextTlsModuleId < uint.MaxValue)
+        if (tlsModuleId != 0 && _nextTlsModuleId == tlsModuleId && _nextTlsModuleId < uint.MaxValue)
         {
             _nextTlsModuleId++;
         }
-        Log.Debug($"TLS load_done assigned={tlsModuleId} next={_nextTlsModuleId}");
+        Console.Error.WriteLine($"[LOADER][TLS] load_done assigned={tlsModuleId} next={_nextTlsModuleId}");
 
         return new SelfImage(
             loadContext.IsSelf,
@@ -276,7 +305,10 @@ public sealed class SelfLoader : ISelfLoader
             procParamAddress,
             applicationInfo.Title,
             applicationInfo.TitleId,
-            applicationInfo.Version);
+            applicationInfo.Version,
+            tlsModuleId,
+            tlsInfo.MemorySize,
+            tlsInfo.StaticOffset);
     }
 
     private static (string? Title, string? TitleId, string? Version) TryLoadParamJson(
@@ -329,7 +361,7 @@ public sealed class SelfLoader : ISelfLoader
         if (magic is Ps4SelfMagic or Ps5SelfMagic)
         {
             var selfHeader = ReadUnmanaged<SelfHeader>(imageData, 0);
-            if (!selfHeader.HasKnownLayout || selfHeader.Unknown != 0x22)
+            if (!selfHeader.HasKnownLayout)
             {
                 throw new InvalidDataException("SELF header signature is not recognized.");
             }
@@ -348,10 +380,17 @@ public sealed class SelfLoader : ISelfLoader
             return new LoadContext(IsSelf: true, elfOffset, selfHeader.FileSize, segments);
         }
 
+        // Not a recognized (fake-signed) SELF. Only a bare, decrypted ELF is
+        // acceptable here; anything else — most commonly a still-encrypted
+        // retail eboot — must be reported clearly rather than failing later
+        // with an opaque "not a valid ELF header" message.
         if (magic != ElfMagic)
         {
             throw new InvalidDataException(
-                $"Unsupported executable signature 0x{magic:X8}");
+                $"Image is neither a decrypted ELF nor a recognized fake-signed SELF " +
+                $"(leading bytes 0x{magic:X8}). This is almost certainly a still-encrypted " +
+                $"retail eboot — SharpEmu has no decryption keys and requires a decrypted / " +
+                $"fake-signed (fSELF) image.");
         }
 
         return new LoadContext(IsSelf: false, ElfOffset: 0, SelfFileSize: 0, Array.Empty<SelfSegment>());
@@ -414,15 +453,15 @@ public sealed class SelfLoader : ISelfLoader
 
             var virtualAddress = header.VirtualAddress + imageBase;
 
-            Log.Debug($"Segment {index}: VAddr=0x{virtualAddress:X16}, FileSize=0x{header.FileSize:X}, MemSize=0x{header.MemorySize:X}, Align=0x{header.Alignment:X}");
+            Console.Error.WriteLine($"[LOADER] Segment {index}: VAddr=0x{virtualAddress:X16}, FileSize=0x{header.FileSize:X}, MemSize=0x{header.MemorySize:X}, Align=0x{header.Alignment:X}");
             if (header.Alignment > 1)
             {
                 var vaddrMod = virtualAddress % header.Alignment;
                 var offsetMod = header.Offset % header.Alignment;
                 if (vaddrMod != offsetMod)
                 {
-                    Log.Warning(
-                        $"Segment {index} ELF alignment mismatch! " +
+                    Console.Error.WriteLine(
+                        $"[LOADER] WARNING: Segment {index} ELF alignment mismatch! " +
                         $"VAddr=0x{virtualAddress:X}, Offset=0x{header.Offset:X}, Align=0x{header.Alignment:X}, " +
                         $"VAddr%Align=0x{vaddrMod:X}, Offset%Align=0x{offsetMod:X}");
                 }
@@ -465,6 +504,43 @@ public sealed class SelfLoader : ISelfLoader
         return 0;
     }
 
+    private static ModuleTlsInfo RegisterModuleTlsTemplate(
+        IReadOnlyList<ProgramHeader> programHeaders,
+        IVirtualMemory virtualMemory,
+        ulong imageBase,
+        uint tlsModuleId)
+    {
+        if (!TryGetProgramHeader(programHeaders, ProgramHeaderType.Tls, out var tlsHeader, out _) ||
+            tlsHeader.MemorySize == 0)
+        {
+            return default;
+        }
+
+        // tdata (initialized) bytes come from the mapped segment; tbss is the
+        // implicitly-zero remainder up to MemorySize.
+        var fileSize = (int)Math.Min(tlsHeader.FileSize, tlsHeader.MemorySize);
+        var initImage = fileSize > 0 ? new byte[fileSize] : [];
+        if (fileSize > 0 &&
+            !virtualMemory.TryRead(imageBase + tlsHeader.VirtualAddress, initImage))
+        {
+            Console.Error.WriteLine(
+                $"[LOADER][TLS] Failed to read TLS init image at 0x{imageBase + tlsHeader.VirtualAddress:X}; seeding zeros.");
+            initImage = [];
+        }
+
+        var staticOffset = GuestTlsTemplate.RegisterModule(
+            tlsModuleId,
+            initImage,
+            tlsHeader.MemorySize,
+            tlsHeader.Alignment,
+            tlsHeader.VirtualAddress);
+        Console.Error.WriteLine(
+            $"[LOADER][TLS] Module {tlsModuleId} TLS template: memsz=0x{tlsHeader.MemorySize:X} " +
+            $"filesz=0x{tlsHeader.FileSize:X} align=0x{tlsHeader.Alignment:X} " +
+            $"static_offset=0x{staticOffset:X} total_static=0x{GuestTlsTemplate.StaticTlsSize:X}");
+        return new ModuleTlsInfo(tlsHeader.MemorySize, staticOffset);
+    }
+
     private static IReadOnlyDictionary<ulong, string> ResolveAndPatchImportStubs(
         ReadOnlySpan<byte> imageData,
         LoadContext loadContext,
@@ -544,12 +620,17 @@ public sealed class SelfLoader : ISelfLoader
         uint maxSymbolIndex = 0;
         foreach (var relocation in relocations)
         {
+            if (relocation.Type == RelocationTypeNone)
+            {
+                continue;
+            }
+
             if (!IsSupportedRelocationType(relocation.Type))
             {
                 continue;
             }
 
-            if (relocation.Type is RelocationTypeRelative or RelocationTypeTlsModuleId)
+            if (relocation.Type is RelocationTypeNone or RelocationTypeRelative or RelocationTypeRelative64 or RelocationTypeTlsModuleId)
             {
                 continue;
             }
@@ -633,13 +714,16 @@ public sealed class SelfLoader : ISelfLoader
 
         importedRelocations = BuildImportedRelocations(descriptors);
 
-        var stubsByAddress = CreateImportStubMapping(virtualMemory, orderedImportNids);
+        var stubImportNids = orderedImportNids
+            .Where(nid => ShouldCreateImportStub(nid, descriptors, moduleManager))
+            .ToArray();
+        var stubsByAddress = CreateImportStubMapping(virtualMemory, stubImportNids);
         Console.WriteLine($"[LOADER] Created {stubsByAddress.Count} import stubs");
 
-        int printCount = Math.Min(10, orderedImportNids.Count);
+        int printCount = Math.Min(10, stubImportNids.Length);
         for (int i = 0; i < printCount; i++)
         {
-            var nid = orderedImportNids[i];
+            var nid = stubImportNids[i];
             var addr = stubsByAddress.First(x => x.Value == nid).Key;
         }
 
@@ -663,45 +747,65 @@ public sealed class SelfLoader : ISelfLoader
 
         foreach (var descriptor in descriptors)
         {
-            ulong targetValue;
+            ulong symbolValue;
             if (descriptor.ImportNid is null)
             {
-                targetValue = AddSigned(descriptor.SymbolValue, descriptor.Addend);
+                symbolValue = descriptor.SymbolValue;
             }
             else
             {
-                if (!addressesByNid.TryGetValue(descriptor.ImportNid, out var stubAddress))
+                if (addressesByNid.TryGetValue(descriptor.ImportNid, out var stubAddress))
                 {
-                    throw new InvalidOperationException($"Import stub not found for NID '{descriptor.ImportNid}'.");
+                    symbolValue = stubAddress;
                 }
-
-                targetValue = AddSigned(stubAddress, descriptor.Addend);
-            }
-
-            if (targetValue < 0x1000)
-            {
-                if (descriptor.ValueKind == RelocationValueKind.TlsModuleId)
+                else if (descriptor.IsWeak)
                 {
-                    Log.Debug(
-                        $"Patching DTPMOD64 at 0x{descriptor.TargetAddress:X} with module id 0x{targetValue:X}");
+                    // ELF unresolved weak definitions use S=0. They must not
+                    // receive a trap import stub, which would turn a permitted
+                    // null test into a call to an unresolved-import handler.
+                    symbolValue = 0;
                 }
                 else
                 {
-                    Log.Warning($"!!! CRITICAL !!! Patching address 0x{descriptor.TargetAddress:X} with INVALID value 0x{targetValue:X} for NID {descriptor.ImportNid ?? "(null)"}");
-                    Log.Warning($"  SymbolValue=0x{descriptor.SymbolValue:X}, Addend=0x{descriptor.Addend:X}, StubAddress=0x{(addressesByNid.TryGetValue(descriptor.ImportNid ?? "", out var sa) ? sa : 0):X}");
+                    throw new InvalidOperationException($"Import stub not found for NID '{descriptor.ImportNid}'.");
                 }
             }
 
-            if (!TryWriteUInt64(virtualMemory, descriptor.TargetAddress, targetValue))
+            var targetValue = ComputeRelocationValue(descriptor, symbolValue);
+
+            if (targetValue < 0x1000 && descriptor.ValueKind is
+                RelocationValueKind.TlsOffset or
+                RelocationValueKind.PcRelative or
+                RelocationValueKind.SymbolSize)
             {
-                throw new InvalidDataException($"Failed to patch relocation at 0x{descriptor.TargetAddress:X16}.");
+                // A TLS offset (TPOFF64/DTPOFF64) is a signed displacement, not a
+                // mapped address, so a small or negative value here is expected.
+            }
+            else if (targetValue < 0x1000 && !descriptor.IsWeak)
+            {
+                if (descriptor.ValueKind == RelocationValueKind.TlsModuleId)
+                {
+                    Console.Error.WriteLine(
+                        $"[LOADER][TLS] Patching DTPMOD64 at 0x{descriptor.TargetAddress:X} with module id 0x{targetValue:X}");
+                }
+                else
+                {
+                    Console.Error.WriteLine($"[LOADER] !!! CRITICAL !!! Patching address 0x{descriptor.TargetAddress:X} with INVALID value 0x{targetValue:X} for NID {descriptor.ImportNid ?? "(null)"}");
+                    Console.Error.WriteLine($"[LOADER]   SymbolValue=0x{descriptor.SymbolValue:X}, Addend=0x{descriptor.Addend:X}, StubAddress=0x{(addressesByNid.TryGetValue(descriptor.ImportNid ?? "", out var sa) ? sa : 0):X}");
+                }
+            }
+
+            if (!TryWriteRelocationValue(virtualMemory, descriptor, targetValue, out var writeError))
+            {
+                throw new InvalidDataException(
+                    $"Failed to patch relocation at 0x{descriptor.TargetAddress:X16}: {writeError}");
             }
 
             if (descriptor.TargetAddress >= 0x00000008030FC300UL &&
                 descriptor.TargetAddress <= 0x00000008030FC3F0UL)
             {
-                Log.Debug(
-                    $"[RELOC] target=0x{descriptor.TargetAddress:X16} value=0x{targetValue:X16} addend=0x{descriptor.Addend:X} nid={(descriptor.ImportNid ?? "<sym>")}");
+                Console.Error.WriteLine(
+                    $"[LOADER][RELOC] target=0x{descriptor.TargetAddress:X16} value=0x{targetValue:X16} addend=0x{descriptor.Addend:X} nid={(descriptor.ImportNid ?? "<sym>")}");
             }
         }
 
@@ -794,29 +898,36 @@ public sealed class SelfLoader : ISelfLoader
         {
             if (IsFocusRelocationOffset(relocation.Offset, imageBase))
             {
-                Log.Debug(
-                    $"[FOCUS][SCAN] off=0x{relocation.Offset:X16} type={relocation.Type} sym={relocation.SymbolIndex} addend=0x{relocation.Addend:X}");
+                Console.Error.WriteLine(
+                    $"[LOADER][FOCUS][SCAN] off=0x{relocation.Offset:X16} type={relocation.Type} sym={relocation.SymbolIndex} addend=0x{relocation.Addend:X}");
             }
 
             if (!IsSupportedRelocationType(relocation.Type))
             {
-                if (IsFocusRelocationOffset(relocation.Offset, imageBase))
+                // Surface unsupported relocation types loudly instead of
+                // skipping silently: TLS-relative (17/18), COPY (5), and
+                // IRELATIVE/ifunc (37) leave their targets unrelocated, which
+                // manifests later as reads of zero or calls into address 0.
+                ReportUnsupportedRelocation(relocation.Type, relocation.Offset, imageBase);
+                if (relocation.Type is 5 or 37)
                 {
-                    Log.Debug($"[FOCUS][SKIP] unsupported type={relocation.Type}");
+                    throw new NotSupportedException(
+                        $"Relocation type {relocation.Type} requires deferred runtime-linker processing.");
                 }
                 continue;
             }
 
-            if (!TryResolveMappedAddress(virtualMemory, relocation.Offset, imageBase, sizeof(ulong), out var targetAddress))
+            var relocationWriteSize = GetRelocationWriteSize(relocation.Type);
+            if (!TryResolveMappedAddress(virtualMemory, relocation.Offset, imageBase, relocationWriteSize, out var targetAddress))
             {
                 if (IsFocusRelocationOffset(relocation.Offset, imageBase))
                 {
-                    Log.Debug("[FOCUS][SKIP] target address not mapped");
+                    Console.Error.WriteLine("[LOADER][FOCUS][SKIP] target address not mapped");
                 }
                 continue;
             }
 
-            if (relocation.Type == RelocationTypeRelative)
+            if (relocation.Type is RelocationTypeRelative or RelocationTypeRelative64)
             {
                 descriptors.Add(new RelocationDescriptor(
                     targetAddress,
@@ -830,7 +941,12 @@ public sealed class SelfLoader : ISelfLoader
 
             if (relocation.Type == RelocationTypeTlsModuleId)
             {
-                var dtpmodValue = tlsModuleId == 0 ? 1u : tlsModuleId;
+                if (tlsModuleId == 0)
+                {
+                    throw new InvalidDataException(
+                        $"R_X86_64_DTPMOD64 at 0x{targetAddress:X16} references a module without PT_TLS.");
+                }
+                var dtpmodValue = tlsModuleId;
                 descriptors.Add(new RelocationDescriptor(
                     targetAddress,
                     0,
@@ -851,50 +967,100 @@ public sealed class SelfLoader : ISelfLoader
             {
                 if (targetAddress >= FocusRelocGuestStart && targetAddress <= FocusRelocGuestEnd)
                 {
-                    Log.Debug($"[FOCUS][SKIP] symbol read failed index={symbolIndex}");
+                    Console.Error.WriteLine($"[LOADER][FOCUS][SKIP] symbol read failed index={symbolIndex}");
                 }
                 continue;
             }
 
-            var addend = relocation.Type is RelocationTypeGlobalData or RelocationTypeJumpSlot ? 0 : relocation.Addend;
-            var symbolBind = GetSymbolBind(symbol.Info);
-            if (symbolBind == SymbolBindLocal)
+            if (relocation.Type is RelocationTypeTlsDtpOff64 or RelocationTypeTlsTpOff64)
             {
-                var symbolAddress = ResolveMappedAddressOrFallback(virtualMemory, symbol.Value, imageBase);
-                if (symbolAddress == 0)
+                // Variant II static TLS: the module block sits at
+                // [tp - blockSize, tp). DTPOFF64 is the module-relative offset
+                // (st_value + addend); TPOFF64 is that offset expressed relative
+                // to the thread pointer, i.e. minus the aligned block size.
+                var tlsSymbolOffset = AddSigned(symbol.Value, relocation.Addend);
+                if (!GuestTlsTemplate.TryGetStaticOffset(tlsModuleId, out var moduleStaticOffset))
                 {
-                    Log.Warning(
-                        $"Skipping local relocation with invalid symbol value 0x{symbol.Value:X} " +
-                        $"at target 0x{targetAddress:X16}, type={relocation.Type}, sym={symbolIndex}");
+                    Console.Error.WriteLine(
+                        $"[LOADER][TLS] Missing PT_TLS registration for module {tlsModuleId}; " +
+                        $"cannot apply relocation {relocation.Type} at 0x{targetAddress:X16}.");
+                    continue;
                 }
-
+                var tlsValue = relocation.Type == RelocationTypeTlsTpOff64
+                    ? unchecked(tlsSymbolOffset - moduleStaticOffset)
+                    : tlsSymbolOffset;
                 descriptors.Add(new RelocationDescriptor(
                     targetAddress,
-                    addend,
+                    0,
                     null,
-                    symbolAddress,
-                    RelocationValueKind.Pointer,
+                    tlsValue,
+                    RelocationValueKind.TlsOffset,
                     IsDataImport: false));
                 continue;
             }
 
+            var symbolBind = GetSymbolBind(symbol.Info);
+            if (symbolIndex == 0)
+            {
+                descriptors.Add(CreateSymbolRelocationDescriptor(
+                    relocation,
+                    targetAddress,
+                    symbol,
+                    symbolAddress: 0,
+                    importNid: null,
+                    isWeak: false));
+                continue;
+            }
+
+            if (symbolBind == SymbolBindLocal)
+            {
+                var symbolAddress = relocation.Type is RelocationTypeSize32 or RelocationTypeSize64
+                    ? 0
+                    : ResolveMappedAddressOrFallback(virtualMemory, symbol.Value, imageBase);
+                if (symbolAddress == 0)
+                {
+                    if (relocation.Type is not (RelocationTypeSize32 or RelocationTypeSize64))
+                    {
+                        Console.Error.WriteLine(
+                            $"[LOADER] Skipping local relocation with invalid symbol value 0x{symbol.Value:X} " +
+                            $"at target 0x{targetAddress:X16}, type={relocation.Type}, sym={symbolIndex}");
+                        continue;
+                    }
+                }
+
+                descriptors.Add(CreateSymbolRelocationDescriptor(
+                    relocation,
+                    targetAddress,
+                    symbol,
+                    symbolAddress,
+                    importNid: null,
+                    isWeak: false));
+                continue;
+            }
+
             if (symbol.Value != 0)
             {
-                var symbolAddress = ResolveMappedAddressOrFallback(virtualMemory, symbol.Value, imageBase);
+                var symbolAddress = relocation.Type is RelocationTypeSize32 or RelocationTypeSize64
+                    ? 0
+                    : ResolveMappedAddressOrFallback(virtualMemory, symbol.Value, imageBase);
                 if (symbolAddress == 0)
                 {
-                    Log.Warning(
-                        $"Skipping relocation with invalid symbol value 0x{symbol.Value:X} " +
-                        $"at target 0x{targetAddress:X16}, type={relocation.Type}, sym={symbolIndex}");
+                    if (relocation.Type is not (RelocationTypeSize32 or RelocationTypeSize64))
+                    {
+                        Console.Error.WriteLine(
+                            $"[LOADER] Skipping relocation with invalid symbol value 0x{symbol.Value:X} " +
+                            $"at target 0x{targetAddress:X16}, type={relocation.Type}, sym={symbolIndex}");
+                        continue;
+                    }
                 }
 
-                descriptors.Add(new RelocationDescriptor(
+                descriptors.Add(CreateSymbolRelocationDescriptor(
+                    relocation,
                     targetAddress,
-                    addend,
-                    null,
+                    symbol,
                     symbolAddress,
-                    RelocationValueKind.Pointer,
-                    IsDataImport: false));
+                    importNid: null,
+                    isWeak: false));
                 continue;
             }
 
@@ -902,16 +1068,26 @@ public sealed class SelfLoader : ISelfLoader
             {
                 if (targetAddress >= FocusRelocGuestStart && targetAddress <= FocusRelocGuestEnd)
                 {
-                    Log.Debug($"[FOCUS][SKIP] bind={symbolBind} not importable");
+                    Console.Error.WriteLine($"[LOADER][FOCUS][SKIP] bind={symbolBind} not importable");
                 }
                 continue;
             }
 
             if (!TryReadNullTerminatedAscii(stringTable, symbol.NameOffset, out var symbolName))
             {
+                if (symbolBind == SymbolBindWeak)
+                {
+                    descriptors.Add(CreateSymbolRelocationDescriptor(
+                        relocation,
+                        targetAddress,
+                        symbol,
+                        symbolAddress: 0,
+                        importNid: null,
+                        isWeak: true));
+                }
                 if (targetAddress >= FocusRelocGuestStart && targetAddress <= FocusRelocGuestEnd)
                 {
-                    Log.Debug($"[FOCUS][SKIP] symbol name read failed offset={symbol.NameOffset}");
+                    Console.Error.WriteLine($"[LOADER][FOCUS][SKIP] symbol name read failed offset={symbol.NameOffset}");
                 }
                 continue;
             }
@@ -919,6 +1095,16 @@ public sealed class SelfLoader : ISelfLoader
             var nid = ExtractNid(symbolName);
             if (string.IsNullOrWhiteSpace(nid))
             {
+                if (symbolBind == SymbolBindWeak)
+                {
+                    descriptors.Add(CreateSymbolRelocationDescriptor(
+                        relocation,
+                        targetAddress,
+                        symbol,
+                        symbolAddress: 0,
+                        importNid: null,
+                        isWeak: true));
+                }
                 continue;
             }
 
@@ -927,16 +1113,74 @@ public sealed class SelfLoader : ISelfLoader
                 orderedImportNids.Add(nid);
             }
 
-            descriptors.Add(new RelocationDescriptor(
+            descriptors.Add(CreateSymbolRelocationDescriptor(
+                relocation,
                 targetAddress,
-                addend,
-                nid,
-                0,
-                RelocationValueKind.Pointer,
-                IsDataImport: GetSymbolType(symbol.Info) == SymbolTypeObject));
+                symbol,
+                symbolAddress: 0,
+                importNid: nid,
+                isWeak: symbolBind == SymbolBindWeak));
         }
     }
 
+    private static RelocationDescriptor CreateSymbolRelocationDescriptor(
+        ElfRelocation relocation,
+        ulong targetAddress,
+        ElfSymbol symbol,
+        ulong symbolAddress,
+        string? importNid,
+        bool isWeak)
+    {
+        var valueKind = relocation.Type switch
+        {
+            RelocationTypePc32 or RelocationTypePlt32 or RelocationTypePc64 => RelocationValueKind.PcRelative,
+            RelocationTypeSize32 or RelocationTypeSize64 => RelocationValueKind.SymbolSize,
+            _ => RelocationValueKind.Pointer,
+        };
+        var writeKind = relocation.Type switch
+        {
+            RelocationTypePc32 or RelocationTypePlt32 or RelocationTypeSigned32 => RelocationWriteKind.Int32,
+            RelocationTypeUnsigned32 or RelocationTypeSize32 => RelocationWriteKind.UInt32,
+            _ => RelocationWriteKind.UInt64,
+        };
+        var symbolValue = valueKind == RelocationValueKind.SymbolSize
+            ? symbol.Size
+            : symbolAddress;
+        var addend = relocation.Type is RelocationTypeGlobalData or RelocationTypeJumpSlot
+            ? 0
+            : relocation.Addend;
+        return new RelocationDescriptor(
+            targetAddress,
+            addend,
+            importNid,
+            symbolValue,
+            valueKind,
+            IsDataImport: GetSymbolType(symbol.Info) == SymbolTypeObject,
+            writeKind,
+            isWeak);
+    }
+
+    private static bool ShouldCreateImportStub(
+        string nid,
+        IReadOnlyList<RelocationDescriptor> descriptors,
+        IModuleManager? moduleManager)
+    {
+        for (var i = 0; i < descriptors.Count; i++)
+        {
+            var descriptor = descriptors[i];
+            if (!string.Equals(descriptor.ImportNid, nid, StringComparison.Ordinal))
+            {
+                continue;
+            }
+            if (!descriptor.IsWeak || moduleManager?.TryGetExport(nid, out _) == true)
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     private static void RegisterRuntimeSymbolsAndHooks(
         ReadOnlySpan<byte> imageData,
         LoadContext loadContext,
@@ -959,8 +1203,8 @@ public sealed class SelfLoader : ISelfLoader
 
         if (sectionSymbols > 0 || dynamicSymbols > 0)
         {
-            Log.Info(
-                $"Runtime symbol index populated: section={sectionSymbols}, dynamic={dynamicSymbols}, total={runtimeSymbols.Count}");
+            Console.Error.WriteLine(
+                $"[LOADER] Runtime symbol index populated: section={sectionSymbols}, dynamic={dynamicSymbols}, total={runtimeSymbols.Count}");
         }
     }
 
@@ -1034,8 +1278,8 @@ public sealed class SelfLoader : ISelfLoader
 
         if (preInitializers.Count != 0 || initializers.Count != 0)
         {
-            Log.Info(
-                $"Initializers discovered: preinit={preInitializers.Count}, init={initializers.Count}");
+            Console.Error.WriteLine(
+                $"[LOADER] Initializers discovered: preinit={preInitializers.Count}, init={initializers.Count}");
         }
     }
 
@@ -1418,8 +1662,8 @@ public sealed class SelfLoader : ISelfLoader
 
         var requiredBytes = checked((ulong)orderedImportNids.Count * ImportStubSlotSize);
         var mapSize = AlignUp(Math.Max(requiredBytes, (ulong)PageSize), PageSize);
-        Log.Debug(
-            $"CreateImportStubMapping: nids={orderedImportNids.Count}, required=0x{requiredBytes:X}, map_size=0x{mapSize:X}");
+        Console.Error.WriteLine(
+            $"[LOADER] CreateImportStubMapping: nids={orderedImportNids.Count}, required=0x{requiredBytes:X}, map_size=0x{mapSize:X}");
         if (mapSize > int.MaxValue)
         {
             throw new NotSupportedException("Import stub mapping exceeds 2 GB and is not supported.");
@@ -1691,11 +1935,51 @@ public sealed class SelfLoader : ISelfLoader
     private static bool IsSupportedRelocationType(uint relocationType)
     {
         return relocationType is
+            RelocationTypeNone or
             RelocationTypeAbsolute64 or
+            RelocationTypePc32 or
+            RelocationTypePlt32 or
             RelocationTypeGlobalData or
             RelocationTypeJumpSlot or
             RelocationTypeRelative or
-            RelocationTypeTlsModuleId;
+            RelocationTypeUnsigned32 or
+            RelocationTypeSigned32 or
+            RelocationTypeTlsModuleId or
+            RelocationTypeTlsDtpOff64 or
+            RelocationTypeTlsTpOff64 or
+            RelocationTypePc64 or
+            RelocationTypeSize32 or
+            RelocationTypeSize64 or
+            RelocationTypeRelative64;
+    }
+
+    private static readonly HashSet<uint> _reportedUnsupportedRelocationTypes = new();
+
+    private static void ReportUnsupportedRelocation(uint relocationType, ulong offset, ulong imageBase)
+    {
+        // Report each distinct unsupported type once to keep the log useful.
+        lock (_reportedUnsupportedRelocationTypes)
+        {
+            if (!_reportedUnsupportedRelocationTypes.Add(relocationType))
+            {
+                if (IsFocusRelocationOffset(offset, imageBase))
+                {
+                    Console.Error.WriteLine($"[LOADER][FOCUS][SKIP] unsupported type={relocationType}");
+                }
+
+                return;
+            }
+        }
+
+        var name = relocationType switch
+        {
+            5 => "R_X86_64_COPY",
+            37 => "R_X86_64_IRELATIVE (ifunc)",
+            _ => "unknown",
+        };
+        Console.Error.WriteLine(
+            $"[LOADER][ERROR] Unsupported relocation type {relocationType} ({name}) rejected " +
+            $"(first at off=0x{offset:X16}); COPY requires dependency symbol storage and IRELATIVE requires resolver execution.");
     }
 
     private static ulong DetermineRequestedImageBase(
@@ -1851,16 +2135,16 @@ public sealed class SelfLoader : ISelfLoader
         tableBytes = GC.AllocateUninitializedArray<byte>((int)size);
 
         var guestAddr = location + imageBase;
-        Log.Debug($"TryLoadTableBytes: trying guest address 0x{guestAddr:X}");
+        Console.Error.WriteLine($"[LOADER] TryLoadTableBytes: trying guest address 0x{guestAddr:X}");
         if (virtualMemory.TryRead(guestAddr, tableBytes))
         {
-            Log.Debug($"TryLoadTableBytes: loaded from guest memory at 0x{guestAddr:X}");
+            Console.Error.WriteLine($"[LOADER] TryLoadTableBytes: loaded from guest memory at 0x{guestAddr:X}");
             return true;
         }
 
         if (virtualMemory.TryRead(location, tableBytes))
         {
-            Log.Debug($"TryLoadTableBytes: loaded from absolute guest address 0x{location:X}");
+            Console.Error.WriteLine($"[LOADER] TryLoadTableBytes: loaded from absolute guest address 0x{location:X}");
             return true;
         }
 
@@ -1868,11 +2152,11 @@ public sealed class SelfLoader : ISelfLoader
         {
             var slice = elfData.Slice((int)location, (int)size);
             tableBytes = slice.ToArray();
-            Log.Debug($"TryLoadTableBytes: loaded from elfData as file offset at 0x{location:X}");
+            Console.Error.WriteLine($"[LOADER] TryLoadTableBytes: loaded from elfData as file offset at 0x{location:X}");
             return true;
         }
 
-        Log.Warning($"TryLoadTableBytes: FAILED for location 0x{location:X}");
+        Console.Error.WriteLine($"[LOADER] TryLoadTableBytes: FAILED for location 0x{location:X}");
         tableBytes = Array.Empty<byte>();
         return false;
     }
@@ -1929,17 +2213,17 @@ public sealed class SelfLoader : ISelfLoader
 
     private static ulong ResolveMappedAddressOrFallback(IVirtualMemory virtualMemory, ulong address, ulong imageBase)
     {
-        Log.Debug($"ResolveMappedAddressOrFallback addr=0x{address:X} imageBase=0x{imageBase:X16}");
+        Console.Error.WriteLine($"[LOADER][TEST] ResolveMappedAddressOrFallback addr=0x{address:X} imageBase=0x{imageBase:X16}");
 
         if (address == 0)
         {
-            Log.Debug("-> return 0 (null)");
+            Console.Error.WriteLine("[LOADER][TEST] -> return 0 (null)");
             return 0;
         }
 
         if (TryResolveMappedAddress(virtualMemory, address, imageBase, 1, out var resolved))
         {
-            Log.Debug($"-> resolved raw 0x{resolved:X16}");
+            Console.Error.WriteLine($"[LOADER][TEST] -> resolved raw 0x{resolved:X16}");
             return resolved;
         }
 
@@ -1948,18 +2232,18 @@ public sealed class SelfLoader : ISelfLoader
             var rebased = address + imageBase;
             if (TryResolveMappedAddress(virtualMemory, rebased, imageBase, 1, out var resolvedRebased))
             {
-                Log.Debug($"-> resolved rebased 0x{resolvedRebased:X16}");
+                Console.Error.WriteLine($"[LOADER][TEST] -> resolved rebased 0x{resolvedRebased:X16}");
                 return resolvedRebased;
             }
         }
 
         if (address < 0x10000)
         {
-            Log.Debug($"-> reject small 0x{address:X}");
+            Console.Error.WriteLine($"[LOADER][TEST] -> reject small 0x{address:X}");
             return 0;
         }
 
-        Log.Debug($"-> fallback raw 0x{address:X}");
+        Console.Error.WriteLine($"[LOADER][TEST] -> fallback raw 0x{address:X}");
         return address;
     }
 
@@ -2049,6 +2333,106 @@ public sealed class SelfLoader : ISelfLoader
         return virtualMemory.TryWrite(address, buffer);
     }
 
+    private static ulong ComputeRelocationValue(RelocationDescriptor descriptor, ulong resolvedSymbolValue)
+    {
+        var baseValue = descriptor.ValueKind == RelocationValueKind.SymbolSize
+            ? descriptor.SymbolValue
+            : resolvedSymbolValue;
+        var value = AddSigned(baseValue, descriptor.Addend);
+        return descriptor.ValueKind == RelocationValueKind.PcRelative
+            ? unchecked(value - descriptor.TargetAddress)
+            : value;
+    }
+
+    private static bool TryWriteRelocationValue(
+        IVirtualMemory virtualMemory,
+        RelocationDescriptor descriptor,
+        ulong value,
+        out string? error)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(ulong)];
+        var length = sizeof(ulong);
+        switch (descriptor.WriteKind)
+        {
+            case RelocationWriteKind.UInt64:
+                BinaryPrimitives.WriteUInt64LittleEndian(buffer, value);
+                break;
+
+            case RelocationWriteKind.UInt32:
+                if (value > uint.MaxValue)
+                {
+                    error = $"value 0x{value:X16} overflows an unsigned 32-bit relocation";
+                    return false;
+                }
+                BinaryPrimitives.WriteUInt32LittleEndian(buffer, (uint)value);
+                length = sizeof(uint);
+                break;
+
+            case RelocationWriteKind.Int32:
+                var signedValue = unchecked((long)value);
+                if (signedValue is < int.MinValue or > int.MaxValue)
+                {
+                    error = $"value {signedValue} overflows a signed 32-bit relocation";
+                    return false;
+                }
+                BinaryPrimitives.WriteInt32LittleEndian(buffer, (int)signedValue);
+                length = sizeof(int);
+                break;
+
+            default:
+                error = $"unknown relocation write kind {descriptor.WriteKind}";
+                return false;
+        }
+
+        error = virtualMemory.TryWrite(descriptor.TargetAddress, buffer[..length])
+            ? null
+            : "target memory is not writable";
+        return error is null;
+    }
+
+    private static int GetRelocationWriteSize(uint relocationType)
+    {
+        return relocationType is
+            RelocationTypePc32 or
+            RelocationTypePlt32 or
+            RelocationTypeUnsigned32 or
+            RelocationTypeSigned32 or
+            RelocationTypeSize32
+                ? sizeof(uint)
+                : sizeof(ulong);
+    }
+
+    [Conditional("DEBUG")]
+    private static void RunRelocationSelfChecks()
+    {
+        var pc32 = new RelocationDescriptor(
+            TargetAddress: 0x1000,
+            Addend: -4,
+            ImportNid: null,
+            SymbolValue: 0x1800,
+            RelocationValueKind.PcRelative,
+            IsDataImport: false,
+            RelocationWriteKind.Int32);
+        Debug.Assert(
+            unchecked((long)ComputeRelocationValue(pc32, pc32.SymbolValue)) == 0x7FC,
+            "R_X86_64_PC32 did not apply S + A - P.");
+
+        var weak = new RelocationDescriptor(
+            TargetAddress: 0x2000,
+            Addend: 7,
+            ImportNid: "weak",
+            SymbolValue: 0,
+            RelocationValueKind.Pointer,
+            IsDataImport: false,
+            IsWeak: true);
+        Debug.Assert(
+            ComputeRelocationValue(weak, resolvedSymbolValue: 0) == 7,
+            "An unresolved weak relocation did not use S=0.");
+        Debug.Assert(
+            !ShouldCreateImportStub("weak", [weak], moduleManager: null),
+            "An unresolved weak symbol incorrectly received a trap import stub.");
+    }
+
     private static ulong AlignUp(ulong value, ulong alignment)
     {
         var mask = alignment - 1;
@@ -2257,6 +2641,16 @@ public sealed class SelfLoader : ISelfLoader
         {
             throw new InvalidDataException($"Unsupported ELF program header entry size: {header.ProgramHeaderEntrySize}.");
         }
+
+        // The CPU backend executes guest instructions natively, so a non
+        // x86-64 image can only fail deep in execution with an opaque SIGILL.
+        // Catch it here with an actionable message. (EM_X86_64 == 62.)
+        const ushort ElfMachineX86_64 = 62;
+        if (header.Machine != ElfMachineX86_64)
+        {
+            throw new InvalidDataException(
+                $"Unsupported ELF machine type 0x{header.Machine:X4}; SharpEmu only runs x86-64 (EM_X86_64) images.");
+        }
     }
 
     private static unsafe T ReadUnmanaged<T>(ReadOnlySpan<byte> source, int offset)
@@ -2337,10 +2731,25 @@ public sealed class SelfLoader : ISelfLoader
         public uint Type => (uint)(Info & uint.MaxValue);
     }
 
+    private readonly record struct ModuleTlsInfo(ulong MemorySize, ulong StaticOffset);
+
     private enum RelocationValueKind : byte
     {
         Pointer = 0,
-        TlsModuleId = 1
+        TlsModuleId = 1,
+        // A pre-computed TLS offset written verbatim (TPOFF64/DTPOFF64). Unlike
+        // Pointer it is a signed displacement, not a mapped address, so it is
+        // patched as-is without the low-address validity warning.
+        TlsOffset = 2,
+        PcRelative = 3,
+        SymbolSize = 4,
+    }
+
+    private enum RelocationWriteKind : byte
+    {
+        UInt64 = 0,
+        UInt32 = 1,
+        Int32 = 2,
     }
 
     private readonly record struct RelocationDescriptor(
@@ -2349,7 +2758,9 @@ public sealed class SelfLoader : ISelfLoader
         string? ImportNid,
         ulong SymbolValue,
         RelocationValueKind ValueKind,
-        bool IsDataImport);
+        bool IsDataImport,
+        RelocationWriteKind WriteKind = RelocationWriteKind.UInt64,
+        bool IsWeak = false);
 
     private enum SelfSegmentResolveStatus
     {
@@ -2379,15 +2790,15 @@ public sealed class SelfLoader : ISelfLoader
         private readonly ushort _size2;
         private readonly ulong _fileSize;
         private readonly ushort _segmentCount;
-        private readonly ushort _unknown;
+        private readonly ushort _flags;
         private readonly uint _padding;
 
         public ushort SegmentCount => _segmentCount;
 
-        public ushort Unknown => _unknown;
-
         public ulong FileSize => _fileSize;
 
+        // Version, key type, and flags are signing metadata and vary across
+        // valid SELF images. They do not change the fixed header layout.
         public bool HasKnownLayout =>
             ((_ident0 == 0x4F &&
               _ident1 == 0x15 &&
@@ -2397,14 +2808,9 @@ public sealed class SelfLoader : ISelfLoader
               _ident1 == 0x14 &&
               _ident2 == 0xF5 &&
               _ident3 == 0xEE)) &&
-            _ident4 == 0x00 &&
             _ident5 == 0x01 &&
             _ident6 == 0x01 &&
-            _ident7 == 0x12 &&
-            _ident8 == 0x01 &&
-            _ident9 == 0x01 &&
-            _ident10 == 0x00 &&
-            _ident11 == 0x00;
+            _ident7 == 0x12;
     }
 
     [StructLayout(LayoutKind.Sequential, Pack = 1)]

src/SharpEmu.Core/Memory/PhysicalVirtualMemory.cs

@@ -48,7 +48,107 @@ public sealed unsafe class PhysicalVirtualMemory : IVirtualMemory, IGuestMemoryA
 
     public PhysicalVirtualMemory(IHostMemory? hostMemory = null)
     {
-        _hostMemory = hostMemory ?? HostPlatform.Current.Memory;
+        _hostMemory = hostMemory ?? CrossPlatformHostMemory.Instance;
+    }
+
+    private sealed class CrossPlatformHostMemory : IHostMemory
+    {
+        public static readonly CrossPlatformHostMemory Instance = new();
+
+        public ulong Allocate(ulong desiredAddress, ulong size, HostPageProtection protection) =>
+            unchecked((ulong)HostMemory.Alloc(
+                (void*)desiredAddress,
+                (nuint)size,
+                HostMemory.MEM_RESERVE | HostMemory.MEM_COMMIT,
+                ToRawProtection(protection)));
+
+        public ulong Reserve(ulong desiredAddress, ulong size, HostPageProtection protection) =>
+            unchecked((ulong)HostMemory.Alloc(
+                (void*)desiredAddress,
+                (nuint)size,
+                HostMemory.MEM_RESERVE,
+                ToRawProtection(protection)));
+
+        public bool Commit(ulong address, ulong size, HostPageProtection protection) =>
+            HostMemory.Alloc(
+                (void*)address,
+                (nuint)size,
+                HostMemory.MEM_COMMIT,
+                ToRawProtection(protection)) != null;
+
+        public bool Free(ulong address) =>
+            HostMemory.Free((void*)address, 0, HostMemory.MEM_RELEASE);
+
+        public bool Protect(
+            ulong address,
+            ulong size,
+            HostPageProtection protection,
+            out uint rawOldProtection) =>
+            HostMemory.Protect(
+                (void*)address,
+                (nuint)size,
+                ToRawProtection(protection),
+                out rawOldProtection);
+
+        public bool ProtectRaw(
+            ulong address,
+            ulong size,
+            uint rawProtection,
+            out uint rawOldProtection) =>
+            HostMemory.Protect((void*)address, (nuint)size, rawProtection, out rawOldProtection);
+
+        public bool Query(ulong address, out HostRegionInfo info)
+        {
+            if (HostMemory.Query((void*)address, out var raw) == 0)
+            {
+                info = default;
+                return false;
+            }
+
+            var state = raw.State switch
+            {
+                HostMemory.MEM_FREE_STATE => HostRegionState.Free,
+                HostMemory.MEM_RESERVE => HostRegionState.Reserved,
+                _ => HostRegionState.Committed,
+            };
+
+            info = new HostRegionInfo(
+                raw.BaseAddress,
+                raw.AllocationBase,
+                raw.RegionSize,
+                state,
+                raw.State,
+                FromRawProtection(raw.Protect),
+                raw.Protect,
+                raw.AllocationProtect);
+            return true;
+        }
+
+        public void FlushInstructionCache(ulong address, ulong size) =>
+            HostMemory.FlushInstructionCache((void*)address, (nuint)size);
+
+        private static uint ToRawProtection(HostPageProtection protection) => protection switch
+        {
+            HostPageProtection.NoAccess => HostMemory.PAGE_NOACCESS,
+            HostPageProtection.ReadOnly => HostMemory.PAGE_READONLY,
+            HostPageProtection.ReadWrite => HostMemory.PAGE_READWRITE,
+            HostPageProtection.Execute => HostMemory.PAGE_EXECUTE,
+            HostPageProtection.ReadExecute => HostMemory.PAGE_EXECUTE_READ,
+            HostPageProtection.ReadWriteExecute => HostMemory.PAGE_EXECUTE_READWRITE,
+            HostPageProtection.ExecuteWriteCopy => 0x80,
+            _ => HostMemory.PAGE_NOACCESS,
+        };
+
+        private static HostPageProtection FromRawProtection(uint protection) => protection switch
+        {
+            HostMemory.PAGE_READONLY => HostPageProtection.ReadOnly,
+            HostMemory.PAGE_READWRITE => HostPageProtection.ReadWrite,
+            HostMemory.PAGE_EXECUTE => HostPageProtection.Execute,
+            HostMemory.PAGE_EXECUTE_READ => HostPageProtection.ReadExecute,
+            HostMemory.PAGE_EXECUTE_READWRITE => HostPageProtection.ReadWriteExecute,
+            0x80 => HostPageProtection.ExecuteWriteCopy,
+            _ => HostPageProtection.NoAccess,
+        };
     }
 
     public bool TryAllocateAtExact(ulong desiredAddress, ulong size, bool executable, out ulong actualAddress)
@@ -98,6 +198,24 @@ public sealed unsafe class PhysicalVirtualMemory : IVirtualMemory, IGuestMemoryA
         return true;
     }
 
+    public string DescribeAddressForDiagnostics(ulong address)
+    {
+        if (!_hostMemory.Query(address, out var info))
+        {
+            return "unable to query host memory at this address";
+        }
+
+        return info.State switch
+        {
+            HostRegionState.Free => "address reports free, but the exact-address reservation still failed",
+            HostRegionState.Reserved =>
+                $"already reserved by another host allocation (base=0x{info.AllocationBase:X16}, size=0x{info.RegionSize:X})",
+            HostRegionState.Committed =>
+                $"already committed by another host allocation (base=0x{info.AllocationBase:X16}, size=0x{info.RegionSize:X}, protect=0x{info.RawProtection:X})",
+            _ => $"in an unexpected host state (raw=0x{info.RawState:X})",
+        };
+    }
+
     public ulong AllocateAt(ulong desiredAddress, ulong size, bool executable = true, bool allowAlternative = true)
     {
         if (size == 0)
@@ -249,42 +367,9 @@ public sealed unsafe class PhysicalVirtualMemory : IVirtualMemory, IGuestMemoryA
         var requestedCursor = AlignUp(desiredAddress, effectiveAlignment);
         var cursor = GetAllocationSearchCursor(desiredAddress, requestedCursor, effectiveAlignment, executable);
 
-        // Under Rosetta 2 the kernel can ignore placement hints for whole
-        // windows, so page-stepped exact probes are pathological on macOS.
-        // Linux must keep using the exact-address search below: PS5 resource
-        // descriptors cannot represent ordinary 0x7F... host mappings. Linux
-        // HostMemory uses MAP_FIXED_NOREPLACE, making those low-address probes
-        // safe without clobbering existing host mappings.
+        // macOS needs alignment over-allocation; Linux uses exact-address search.
         if (OperatingSystem.IsMacOS())
         {
-            // Prefer the requested low address.  Besides matching the guest
-            // address model, this keeps the allocation representable by every
-            // PS5 GPU descriptor (the strictest ones carry 40 address bits).
-            try
-            {
-                var exactAddress = AllocateAt(
-                    cursor,
-                    alignedSize,
-                    executable,
-                    allowAlternative: false);
-                if (exactAddress == cursor)
-                {
-                    actualAddress = exactAddress;
-                    UpdateAllocationSearchCursor(
-                        desiredAddress,
-                        effectiveAlignment,
-                        executable,
-                        exactAddress + alignedSize);
-                    return true;
-                }
-            }
-            catch
-            {
-            }
-
-            // Over-allocate by the alignment so a kernel-chosen placement
-            // always contains an aligned start; the unused head/tail stays
-            // part of the tracked region and is simply never handed out.
             var reserveSize = effectiveAlignment > PageSize
                 ? alignedSize + effectiveAlignment
                 : alignedSize;
@@ -294,10 +379,7 @@ public sealed unsafe class PhysicalVirtualMemory : IVirtualMemory, IGuestMemoryA
                 if (posixAddress != 0)
                 {
                     var alignedBase = AlignUp(posixAddress, effectiveAlignment);
-                    const ulong gpuAddressLimit = 1UL << 40;
-                    if (alignedBase < gpuAddressLimit &&
-                        alignedSize <= gpuAddressLimit - alignedBase &&
-                        alignedBase + alignedSize <= posixAddress + reserveSize)
+                    if (alignedBase + alignedSize <= posixAddress + reserveSize)
                     {
                         actualAddress = alignedBase;
                         UpdateAllocationSearchCursor(desiredAddress, effectiveAlignment, executable, alignedBase + alignedSize);
@@ -327,19 +409,10 @@ public sealed unsafe class PhysicalVirtualMemory : IVirtualMemory, IGuestMemoryA
                 continue;
             }
 
-            try
-            {
-                actualAddress = AllocateAt(cursor, alignedSize, executable, allowAlternative: false);
-                if (actualAddress == cursor)
-                {
-                    UpdateAllocationSearchCursor(desiredAddress, effectiveAlignment, executable, actualAddress + alignedSize);
-                    return true;
-                }
-
-                actualAddress = 0;
-            }
-            catch
+            if (TryAllocateAtExact(cursor, alignedSize, executable, out actualAddress))
             {
+                UpdateAllocationSearchCursor(desiredAddress, effectiveAlignment, executable, actualAddress + alignedSize);
+                return true;
             }
 
             cursor = AlignUp(cursor + effectiveAlignment, effectiveAlignment);

src/SharpEmu.Core/Runtime/SharpEmuRuntime.cs

@@ -7,25 +7,22 @@ using SharpEmu.Core.Cpu.Disasm;
 using SharpEmu.Core.Loader;
 using SharpEmu.Core.Memory;
 using SharpEmu.HLE;
-using SharpEmu.HLE.Host;
 using SharpEmu.Libs.VideoOut;
 using SharpEmu.Libs.Kernel;
 using SharpEmu.Libs.AppContent;
 using SharpEmu.Libs.SaveData;
-using SharpEmu.Logging;
+using SharpEmu.Libs.Fiber;
+using SharpEmu.Libs.SystemService;
 using System.Buffers.Binary;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
-using System.IO;
 
 namespace SharpEmu.Core.Runtime;
 
 public sealed class SharpEmuRuntime : ISharpEmuRuntime
 {
-    private static readonly SharpEmuLogger Log = SharpEmuLog.For("Runtime");
-
-    private readonly record struct LoadedModuleImage(string Path, SelfImage Image);
+    private readonly record struct LoadedModuleImage(string Path, SelfImage Image, int Handle, bool StartAtBoot);
 
     private static readonly HashSet<string> PreloadSkipModules = new(StringComparer.OrdinalIgnoreCase)
     {
@@ -89,19 +86,14 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
         moduleManager.RegisterExports(SharpEmu.Generated.SysAbiExportRegistry.CreateExports(Generation.Gen4 | Generation.Gen5));
         moduleManager.Freeze();
 
-        // Resolve the host platform once at the composition root; on unsupported
-        // OSes this throws PlatformNotSupportedException with a clear message
-        // instead of failing on the first native call.
-        var hostPlatform = HostPlatform.Current;
-
-        var virtualMemory = new PhysicalVirtualMemory(hostPlatform.Memory);
+        var virtualMemory = new PhysicalVirtualMemory();
 
         var fileSystem = new PhysicalFileSystem();
 
         return new SharpEmuRuntime(
             new SelfLoader(),
             virtualMemory,
-            new CpuDispatcher(virtualMemory, moduleManager, hostPlatform: hostPlatform),
+            new CpuDispatcher(virtualMemory, moduleManager),
             moduleManager,
             Aerolib.Instance,
             cpuExecutionOptions,
@@ -139,20 +131,21 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
     {
         var normalizedEbootPath = Path.GetFullPath(ebootPath);
         using var app0Binding = BindApp0Root(normalizedEbootPath);
-        Log.Info($"Loading: {ebootPath}");
+        Console.Error.WriteLine($"[RUNTIME] Loading: {ebootPath}");
         LastExecutionDiagnostics = null;
         LastExecutionTrace = null;
         LastSessionSummary = null;
         LastBasicBlockTrace = null;
         LastMilestoneLog = null;
+        FiberExports.ResetRuntimeState();
         KernelModuleRegistry.Reset();
         var image = LoadImage(normalizedEbootPath);
-        VideoOutExports.ConfigureApplicationInfo(image.Title, image.TitleId, image.Version, BuildInfo.CommitSha);
+        VideoOutExports.ConfigureApplicationInfo(image.Title, image.TitleId, image.Version);
         SaveDataExports.ConfigureApplicationInfo(image.TitleId);
-        LogAppBundleInfo(normalizedEbootPath, image);
-        RegisterLoadedModule(normalizedEbootPath, image, isMain: true, isSystemModule: false);
+        SystemServiceExports.ConfigureApplicationInfo(image.TitleId);
+        _ = RegisterLoadedModule(normalizedEbootPath, image, isMain: true, isSystemModule: false);
         KernelRuntimeCompatExports.ConfigureProcessProcParamAddress(image.ProcParamAddress);
-        Log.Info($"Entry: 0x{image.EntryPoint:X16}");
+        Console.Error.WriteLine($"[RUNTIME] Entry: 0x{image.EntryPoint:X16}");
         var generation = image.ElfHeader.AbiVersion == 2 ? Generation.Gen5 : Generation.Gen4;
         var activeImportStubs = new Dictionary<ulong, string>(image.ImportStubs);
         var activeRuntimeSymbols = new Dictionary<string, ulong>(image.RuntimeSymbols, StringComparer.Ordinal);
@@ -175,7 +168,7 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
             processImageName);
         if (initializerResult is { } failedInitializerResult)
         {
-            Log.Error($"Initializer dispatch failed: {failedInitializerResult}");
+            Console.Error.WriteLine($"[RUNTIME] Initializer dispatch failed: {failedInitializerResult}");
             LastExecutionTrace = _cpuDispatcher.LastImportResolutionTrace;
             LastMilestoneLog = _cpuDispatcher.LastMilestoneLog;
             LastSessionSummary = BuildSessionSummary(_cpuDispatcher.LastSessionSummary);
@@ -183,8 +176,8 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
             return failedInitializerResult;
         }
 
-        Log.Info($"Dispatching, gen: {generation}");
-        Log.Debug($"About to call DispatchEntry with entryPoint=0x{image.EntryPoint:X16}");
+        Console.Error.WriteLine($"[RUNTIME] Dispatching, gen: {generation}");
+        Console.Error.WriteLine($"[RUNTIME] About to call DispatchEntry with entryPoint=0x{image.EntryPoint:X16}");
 
         var result = _cpuDispatcher.DispatchEntry(
             image.EntryPoint,
@@ -194,8 +187,18 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
             processImageName,
             _cpuExecutionOptions);
 
-        Log.Info($"DispatchEntry returned: {result}");
-        Log.Info($"Dispatch result: {result}");
+        Console.Error.WriteLine($"[RUNTIME] DispatchEntry returned: {result}");
+        Console.Error.WriteLine($"[RUNTIME] Dispatch result: {result}");
+
+        // Stop is a host operation, not an emulation failure. The detailed
+        // trace and session-summary builders can traverse a partially torn
+        // down native backend, delaying the GUI exit callback indefinitely.
+        if (HostSessionControl.IsShutdownRequested)
+        {
+            Console.Error.WriteLine("[RUNTIME] Skipping post-exit diagnostics for host shutdown.");
+            return result;
+        }
+
         LastExecutionTrace = _cpuDispatcher.LastImportResolutionTrace;
         LastMilestoneLog = _cpuDispatcher.LastMilestoneLog;
         LastSessionSummary = BuildSessionSummary(_cpuDispatcher.LastSessionSummary);
@@ -366,66 +369,6 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
         return result;
     }
 
-    private static void LogAppBundleInfo(string ebootPath, SelfImage image)
-    {
-        var executableName = Path.GetFileName(ebootPath);
-        if (string.IsNullOrWhiteSpace(executableName))
-        {
-            executableName = "eboot.bin";
-        }
-
-        var displayName = string.IsNullOrWhiteSpace(image.Title) ? "(unknown)" : image.Title!.Trim();
-        var titleId = string.IsNullOrWhiteSpace(image.TitleId) ? "(unknown)" : image.TitleId!.Trim();
-        var version = string.IsNullOrWhiteSpace(image.Version) ? "(unknown)" : image.Version!.Trim();
-        var contentId = ResolveContentId(Path.GetDirectoryName(ebootPath)) ?? "(unknown)";
-
-        var builder = new StringBuilder();
-        builder.AppendLine("App bundle info:");
-        builder.AppendLine($"- Display name: {displayName}");
-        builder.AppendLine($"- Version: {version}");
-        builder.AppendLine($"- Title ID: {titleId}");
-        builder.AppendLine($"- Content ID: {contentId}");
-        builder.AppendLine($"- Executable: {executableName}");
-        builder.Append("- Platform: PlayStation 5");
-        Log.Info(builder.ToString());
-    }
-
-    private static string? ResolveContentId(string? bundleRoot)
-    {
-        if (string.IsNullOrEmpty(bundleRoot))
-        {
-            return null;
-        }
-
-        foreach (var candidate in new[]
-        {
-            Path.Combine(bundleRoot, "sce_sys", "param.json"),
-            Path.Combine(bundleRoot, "param.json"),
-        })
-        {
-            if (!File.Exists(candidate))
-            {
-                continue;
-            }
-
-            try
-            {
-                using var doc = System.Text.Json.JsonDocument.Parse(File.ReadAllBytes(candidate));
-                if (doc.RootElement.TryGetProperty("contentId", out var contentId))
-                {
-                    return contentId.GetString();
-                }
-            }
-            catch (Exception ex) when (ex is IOException or System.Text.Json.JsonException)
-            {
-            }
-
-            break;
-        }
-
-        return null;
-    }
-
     private static App0BindingScope? BindApp0Root(string normalizedEbootPath)
     {
         const string app0VariableName = "SHARPEMU_APP0_DIR";
@@ -440,6 +383,20 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
             return null;
         }
 
+        // Dump tools commonly place decrypted executables in an app0/decrypted
+        // sidecar while leaving Unity data in the parent app0 directory. Keep
+        // loading code/modules beside the decrypted eboot, but mount /app0 at
+        // the content-bearing parent so boot.config, metadata and assets resolve.
+        if (string.Equals(Path.GetFileName(app0Root), "decrypted", StringComparison.OrdinalIgnoreCase))
+        {
+            var parentRoot = Path.GetDirectoryName(app0Root);
+            if (!string.IsNullOrWhiteSpace(parentRoot) &&
+                Directory.Exists(Path.Combine(parentRoot, "Media")))
+            {
+                app0Root = parentRoot;
+            }
+        }
+
         Environment.SetEnvironmentVariable(app0VariableName, app0Root);
         return new App0BindingScope(app0VariableName);
     }
@@ -485,6 +442,56 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
         return null;
     }
 
+    private bool TryGetEhFrameInfo(
+        SelfImage image,
+        ulong imageSize,
+        out ulong ehFrameHeaderAddress,
+        out ulong ehFrameAddress,
+        out ulong ehFrameSize)
+    {
+        ehFrameHeaderAddress = 0;
+        ehFrameAddress = 0;
+        ehFrameSize = 0;
+        var imageBase = image.EntryPoint >= image.ElfHeader.EntryPoint
+            ? image.EntryPoint - image.ElfHeader.EntryPoint
+            : 0UL;
+        for (var i = 0; i < image.ProgramHeaders.Count; i++)
+        {
+            var header = image.ProgramHeaders[i];
+            if (header.HeaderType != ProgramHeaderType.GnuEhFrame || header.MemorySize < 8)
+            {
+                continue;
+            }
+
+            var headerAddress = imageBase + header.VirtualAddress;
+            Span<byte> ehHeader = stackalloc byte[8];
+            if (!_virtualMemory.TryRead(headerAddress, ehHeader) ||
+                ehHeader[0] != 1 ||
+                ehHeader[1] != 0x1B)
+            {
+                continue;
+            }
+
+            var relativeOffset = BinaryPrimitives.ReadInt32LittleEndian(ehHeader[4..]);
+            ehFrameHeaderAddress = headerAddress;
+            ehFrameAddress = unchecked((ulong)((long)headerAddress + 4 + relativeOffset));
+            if (ehFrameAddress < 0x10000)
+            {
+                continue;
+            }
+
+            var relativeEhFrameAddress = ehFrameAddress - imageBase;
+            ehFrameSize = header.VirtualAddress > relativeEhFrameAddress
+                ? header.VirtualAddress - relativeEhFrameAddress
+                : imageSize > header.VirtualAddress
+                    ? imageSize - header.VirtualAddress
+                    : 0;
+            return true;
+        }
+
+        return false;
+    }
+
     private OrbisGen2Result? RunPreloadedModuleInitializers(
         IReadOnlyList<LoadedModuleImage> loadedModuleImages,
         Generation generation,
@@ -494,20 +501,30 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
         for (var i = 0; i < loadedModuleImages.Count; i++)
         {
             var loadedModule = loadedModuleImages[i];
+            if (!loadedModule.StartAtBoot)
+            {
+                continue;
+            }
+
             var initEntryPoint = loadedModule.Image.InitFunctionEntryPoint;
             if (initEntryPoint < 0x10000)
             {
                 continue;
             }
 
+            if (!KernelModuleRegistry.TryBeginModuleStart(loadedModule.Handle, out _))
+            {
+                continue;
+            }
+
             var moduleName = Path.GetFileName(loadedModule.Path);
             if (string.IsNullOrWhiteSpace(moduleName))
             {
                 moduleName = $"module#{i}";
             }
 
-            Log.Info(
-                $"Starting module {moduleName}: dt_init=0x{initEntryPoint:X16}");
+            Console.Error.WriteLine(
+                $"[RUNTIME] Starting module {moduleName}: dt_init=0x{initEntryPoint:X16}");
 
             var result = _cpuDispatcher.DispatchModuleInitializer(
                 initEntryPoint,
@@ -516,10 +533,13 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
                 activeRuntimeSymbols,
                 moduleName,
                 _cpuExecutionOptions);
+            KernelModuleRegistry.CompleteModuleStart(
+                loadedModule.Handle,
+                result == OrbisGen2Result.ORBIS_GEN2_OK);
             if (result != OrbisGen2Result.ORBIS_GEN2_OK)
             {
-                Log.Error(
-                    $"Module start failed: {moduleName} -> {result}");
+                Console.Error.WriteLine(
+                    $"[RUNTIME] Module start failed: {moduleName} -> {result}");
                 return result;
             }
         }
@@ -540,8 +560,8 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
             return null;
         }
 
-        Log.Info(
-            $"Running initializers for {label}: preinit={image.PreInitializerFunctions.Count}, init={image.InitializerFunctions.Count}");
+        Console.Error.WriteLine(
+            $"[RUNTIME] Running initializers for {label}: preinit={image.PreInitializerFunctions.Count}, init={image.InitializerFunctions.Count}");
 
         var result = RunInitializerList(
             $"{label}:preinit",
@@ -580,8 +600,8 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
                 continue;
             }
 
-            Log.Debug(
-                $"  Initializer {label}[{i}] -> 0x{initializerAddress:X16}");
+            Console.Error.WriteLine(
+                $"[RUNTIME]   Initializer {label}[{i}] -> 0x{initializerAddress:X16}");
 
             var result = _cpuDispatcher.DispatchEntry(
                 initializerAddress,
@@ -613,12 +633,17 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
 
         var moduleDirectories = new[]
         {
-            Path.Combine(ebootDirectory, "sce_module"),
-            Path.Combine(ebootDirectory, "sce_modules"),
-            Path.Combine(ebootDirectory, "Media", "Modules"),
+            (Path: Path.Combine(ebootDirectory, "sce_module"), StartAtBoot: true),
+            (Path: Path.Combine(ebootDirectory, "sce_modules"), StartAtBoot: true),
+            (Path: Path.Combine(ebootDirectory, "Media", "Modules"), StartAtBoot: true),
+            // Unity native plugins are loaded later through sceKernelLoadStartModule. Map
+            // them up front so the HLE loader can return a real module handle and dlsym
+            // can resolve their exports, but defer DT_INIT until the guest requests them.
+            (Path: Path.Combine(ebootDirectory, "Media", "Plugins"), StartAtBoot: false),
         }
-        .Distinct(StringComparer.OrdinalIgnoreCase)
-        .Where(Directory.Exists)
+        .GroupBy(entry => entry.Path, StringComparer.OrdinalIgnoreCase)
+        .Select(group => group.First())
+        .Where(entry => Directory.Exists(entry.Path))
         .ToArray();
 
         if (moduleDirectories.Length == 0)
@@ -628,28 +653,30 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
 
         var allModulePaths = moduleDirectories
             .SelectMany(directory => Directory
-                .EnumerateFiles(directory)
-                .OrderBy(path => path, StringComparer.OrdinalIgnoreCase))
-            .Where(path =>
+                .EnumerateFiles(directory.Path)
+                .OrderBy(path => path, StringComparer.OrdinalIgnoreCase)
+                .Select(path => (Path: path, directory.StartAtBoot)))
+            .Where(entry =>
             {
-                var extension = Path.GetExtension(path);
+                var extension = Path.GetExtension(entry.Path);
                 return string.Equals(extension, ".prx", StringComparison.OrdinalIgnoreCase) ||
                        string.Equals(extension, ".sprx", StringComparison.OrdinalIgnoreCase);
             })
-            .Distinct(StringComparer.OrdinalIgnoreCase)
+            .GroupBy(entry => entry.Path, StringComparer.OrdinalIgnoreCase)
+            .Select(group => group.First())
             .ToArray();
 
         var modulePaths = allModulePaths
-            .Where(ShouldPreloadModule)
+            .Where(entry => ShouldPreloadModule(entry.Path))
             .ToArray();
         var skippedModules = allModulePaths
-            .Where(path => !ShouldPreloadModule(path))
-            .Select(Path.GetFileName)
+            .Where(entry => !ShouldPreloadModule(entry.Path))
+            .Select(entry => Path.GetFileName(entry.Path))
             .Where(name => !string.IsNullOrWhiteSpace(name))
             .ToArray();
         if (skippedModules.Length > 0)
         {
-            Log.Info($"Skipping {skippedModules.Length} core module(s): {string.Join(", ", skippedModules)}");
+            Console.Error.WriteLine($"[RUNTIME] Skipping {skippedModules.Length} core module(s): {string.Join(", ", skippedModules)}");
         }
 
         if (modulePaths.Length == 0)
@@ -657,14 +684,15 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
             return loadedImages;
         }
 
-        Log.Debug($"Module search directories: {string.Join(", ", moduleDirectories)}");
-        Log.Info($"Loading {modulePaths.Length} module(s)...");
+        Console.Error.WriteLine($"[RUNTIME] Module search directories: {string.Join(", ", moduleDirectories.Select(entry => entry.Path))}");
+        Console.Error.WriteLine($"[RUNTIME] Loading {modulePaths.Length} module(s)...");
         var loadedModules = 0;
         var failedModules = 0;
         var mergedImportCount = 0;
         var mergedSymbolCount = 0;
-        foreach (var modulePath in modulePaths)
+        foreach (var moduleEntry in modulePaths)
         {
+            var modulePath = moduleEntry.Path;
             try
             {
                 var fileInfo = new FileInfo(modulePath);
@@ -689,25 +717,52 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
 
                 mergedImportCount += MergeImportStubs(importStubs, moduleImage.ImportStubs, modulePath);
                 mergedSymbolCount += MergeRuntimeSymbols(runtimeSymbols, moduleImage.RuntimeSymbols);
-                RegisterLoadedModule(modulePath, moduleImage, isMain: false, isSystemModule: false);
-                loadedImages.Add(new LoadedModuleImage(modulePath, moduleImage));
+                InstallNativePluginCompatibilityHooks(importStubs, moduleImage, modulePath);
+                var moduleHandle = RegisterLoadedModule(modulePath, moduleImage, isMain: false, isSystemModule: false);
+                var moduleName = Path.GetFileName(modulePath);
+                var startAtBoot = moduleEntry.StartAtBoot ||
+                    string.Equals(moduleName, "libfmod.prx", StringComparison.OrdinalIgnoreCase) ||
+                    string.Equals(moduleName, "libfmodstudio.prx", StringComparison.OrdinalIgnoreCase);
+                loadedImages.Add(new LoadedModuleImage(modulePath, moduleImage, moduleHandle, startAtBoot));
                 loadedModules++;
 
-                Log.Info(
-                    $"Loaded module {Path.GetFileName(modulePath)}: entry=0x{moduleImage.EntryPoint:X16}, imports={moduleImage.ImportStubs.Count}, symbols={moduleImage.RuntimeSymbols.Count}");
+                Console.Error.WriteLine(
+                    $"[RUNTIME] Loaded module {Path.GetFileName(modulePath)}: entry=0x{moduleImage.EntryPoint:X16}, imports={moduleImage.ImportStubs.Count}, symbols={moduleImage.RuntimeSymbols.Count}");
             }
             catch (Exception ex)
             {
                 failedModules++;
-                Log.Error($"Module load failed: {modulePath} ({ex.GetType().Name}: {ex.Message})", ex);
+                Console.Error.WriteLine($"[RUNTIME] Module load failed: {modulePath} ({ex.GetType().Name}: {ex.Message})");
             }
         }
 
-        Log.Info(
-            $"Module preload summary: loaded={loadedModules}, failed={failedModules}, merged_imports={mergedImportCount}, merged_symbols={mergedSymbolCount}");
+        Console.Error.WriteLine(
+            $"[RUNTIME] Module preload summary: loaded={loadedModules}, failed={failedModules}, merged_imports={mergedImportCount}, merged_symbols={mergedSymbolCount}");
         return loadedImages;
     }
 
+    private static void InstallNativePluginCompatibilityHooks(
+        IDictionary<ulong, string> importStubs,
+        SelfImage moduleImage,
+        string modulePath)
+    {
+        if (!string.Equals(Path.GetFileName(modulePath), "libfmod.prx", StringComparison.OrdinalIgnoreCase))
+        {
+            return;
+        }
+
+        ReadOnlySpan<string> compatibilityNids = ["uPLTdl3psGk"];
+        foreach (var nid in compatibilityNids)
+        {
+            if (moduleImage.RuntimeSymbols.TryGetValue(nid, out var address) && address >= 0x10000)
+            {
+                importStubs[address] = nid;
+                Console.Error.WriteLine(
+                    $"[RUNTIME] Installed FMOD compatibility hook: {nid} -> 0x{address:X16}");
+            }
+        }
+    }
+
     private void RebindImportedDataSymbols(
         SelfImage mainImage,
         IReadOnlyList<LoadedModuleImage> loadedModuleImages,
@@ -724,8 +779,8 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
 
         if (rebound != 0 || unresolved != 0)
         {
-            Log.Info(
-                $"Imported data rebind: rebound={rebound}, unresolved={unresolved}");
+            Console.Error.WriteLine(
+                $"[RUNTIME] Imported data rebind: rebound={rebound}, unresolved={unresolved}");
         }
     }
 
@@ -757,8 +812,8 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
             {
                 if (logRebind)
                 {
-                    Log.Warning(
-                        $"Imported data unresolved: nid={relocation.Nid} target=0x{relocation.TargetAddress:X16} addend=0x{unchecked((ulong)relocation.Addend):X16}");
+                    Console.Error.WriteLine(
+                        $"[RUNTIME] Imported data unresolved: nid={relocation.Nid} target=0x{relocation.TargetAddress:X16} addend=0x{unchecked((ulong)relocation.Addend):X16}");
                 }
 
                 unresolved++;
@@ -770,8 +825,8 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
             {
                 if (logRebind)
                 {
-                    Log.Error(
-                        $"Imported data write-failed: nid={relocation.Nid} target=0x{relocation.TargetAddress:X16} value=0x{reboundValue:X16}");
+                    Console.Error.WriteLine(
+                        $"[RUNTIME] Imported data write-failed: nid={relocation.Nid} target=0x{relocation.TargetAddress:X16} value=0x{reboundValue:X16}");
                 }
 
                 unresolved++;
@@ -780,8 +835,8 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
 
             if (logRebind)
             {
-                Log.Debug(
-                    $"Imported data rebound: nid={relocation.Nid} target=0x{relocation.TargetAddress:X16} value=0x{reboundValue:X16}");
+                Console.Error.WriteLine(
+                    $"[RUNTIME] Imported data rebound: nid={relocation.Nid} target=0x{relocation.TargetAddress:X16} value=0x{reboundValue:X16}");
             }
 
             rebound++;
@@ -817,8 +872,8 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
             {
                 if (!string.Equals(existingNid, nid, StringComparison.Ordinal))
                 {
-                    Log.Warning(
-                        $"Import stub conflict at 0x{address:X16}: keep={existingNid}, skip={nid} ({Path.GetFileName(modulePath)})");
+                    Console.Error.WriteLine(
+                        $"[RUNTIME] Import stub conflict at 0x{address:X16}: keep={existingNid}, skip={nid} ({Path.GetFileName(modulePath)})");
                 }
 
                 continue;
@@ -912,7 +967,7 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
         return !PreloadSkipModules.Contains(fileName);
     }
 
-    private static void RegisterLoadedModule(string modulePath, SelfImage image, bool isMain, bool isSystemModule)
+    private int RegisterLoadedModule(string modulePath, SelfImage image, bool isMain, bool isSystemModule)
     {
         if (!TryComputeImageRange(image, out var baseAddress, out var size))
         {
@@ -920,15 +975,27 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
             size = 0;
         }
 
+        _ = TryGetEhFrameInfo(
+            image,
+            size,
+            out var ehFrameHeaderAddress,
+            out var ehFrameAddress,
+            out var ehFrameSize);
         var handle = KernelModuleRegistry.RegisterModule(
             modulePath,
             baseAddress,
             size,
             image.EntryPoint,
+            image.InitFunctionEntryPoint,
+            ehFrameHeaderAddress,
+            ehFrameAddress,
+            ehFrameSize,
             isMain,
             isSystemModule);
-        Log.Info(
-            $"Registered module handle={handle} name={Path.GetFileName(modulePath)} base=0x{baseAddress:X16} size=0x{size:X16}");
+        KernelModuleRegistry.RegisterModuleSymbols(handle, image.RuntimeSymbols);
+        Console.Error.WriteLine(
+            $"[RUNTIME] Registered module handle={handle} name={Path.GetFileName(modulePath)} base=0x{baseAddress:X16} size=0x{size:X16}");
+        return handle;
     }
 
     private static bool TryComputeImageRange(SelfImage image, out ulong baseAddress, out ulong size)
@@ -1095,6 +1162,16 @@ public sealed class SharpEmuRuntime : ISharpEmuRuntime
             disposableDispatcher.Dispose();
         }
 
+        if (_cpuDispatcher is CpuDispatcher { NativeSessionLeaked: true })
+        {
+            // A guest worker is still inside guest code; unmapping the guest
+            // address space under it would fault the whole process, which
+            // hosts the GUI launcher in embedded sessions.
+            Console.Error.WriteLine(
+                "[RUNTIME] Guest workers were still active at teardown; keeping the guest address space mapped.");
+            return;
+        }
+
         if (_virtualMemory is IDisposable disposableMemory)
         {
             disposableMemory.Dispose();

src/SharpEmu.Core/SharpEmu.Core.csproj

@@ -14,6 +14,10 @@ SPDX-License-Identifier: GPL-2.0-or-later
     <PackageReference Include="Iced" />
   </ItemGroup>
 
+  <ItemGroup>
+    <InternalsVisibleTo Include="SharpEmu.Libs.Tests" />
+  </ItemGroup>
+
   <PropertyGroup>
     <NoWarn>$(NoWarn);1591</NoWarn>
   </PropertyGroup>

src/SharpEmu.GUI/App.axaml

@@ -29,6 +29,7 @@ SPDX-License-Identifier: GPL-2.0-or-later
     <SolidColorBrush x:Key="DangerBrush" Color="#E5484D" />
     <SolidColorBrush x:Key="DangerHoverBrush" Color="#F2555A" />
     <SolidColorBrush x:Key="SuccessBrush" Color="#46C46B" />
+    <SolidColorBrush x:Key="InfoBrush" Color="#58A6FF" />
     <SolidColorBrush x:Key="TileHoverBrush" Color="#1A2130" />
     <SolidColorBrush x:Key="TileSelectedBrush" Color="#212A3F" />
   </Application.Resources>
@@ -55,6 +56,22 @@ SPDX-License-Identifier: GPL-2.0-or-later
       <Setter Property="Padding" Value="10,3" />
     </Style>
 
+    <!-- Session status/hotkey badges: the title-id pill geometry with a
+         tinted fill so state (RUNNING) and keys (F11) read at a glance. -->
+    <Style Selector="Border.badge">
+      <Setter Property="CornerRadius" Value="999" />
+      <Setter Property="Padding" Value="8,2" />
+      <Setter Property="BorderThickness" Value="1" />
+    </Style>
+    <Style Selector="Border.badge.running">
+      <Setter Property="Background" Value="#1E46C46B" />
+      <Setter Property="BorderBrush" Value="#5546C46B" />
+    </Style>
+    <Style Selector="Border.badge.key">
+      <Setter Property="Background" Value="#1E58A6FF" />
+      <Setter Property="BorderBrush" Value="#5558A6FF" />
+    </Style>
+
     <Style Selector="TextBlock.sectionTitle">
       <Setter Property="FontSize" Value="11" />
       <Setter Property="FontWeight" Value="SemiBold" />

src/SharpEmu.GUI/EmulatorProcess.cs

@@ -1,7 +1,6 @@
 // Copyright (C) 2026 SharpEmu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
-using System.ComponentModel;
 using System.Diagnostics;
 using System.Runtime.InteropServices;
 using System.Text;
@@ -10,32 +9,36 @@ using Microsoft.Win32.SafeHandles;
 namespace SharpEmu.GUI;
 
 /// <summary>
-/// Launches the SharpEmu CLI as a child process with the same CET/CFG mitigation
-/// opt-outs the CLI would apply to its own relaunched child, while capturing
-/// stdout/stderr through pipes. The CLI's internal relaunch is suppressed via
-/// SHARPEMU_DISABLE_MITIGATION_RELAUNCH so output is not lost to a detached
-/// console. A kill-on-close job object ties the emulator's lifetime to the GUI.
+/// Owns an isolated emulator process. Guest virtual memory is fixed-address and
+/// cannot be reliably reused while guest-created host threads are still alive,
+/// so the GUI must never execute a game in its own process.
 /// </summary>
 internal sealed class EmulatorProcess : IDisposable
 {
-    private const uint EXTENDED_STARTUPINFO_PRESENT = 0x00080000;
-    private const uint CREATE_NO_WINDOW = 0x08000000;
-    private const int STARTF_USESTDHANDLES = 0x00000100;
-    private const uint HANDLE_FLAG_INHERIT = 0x00000001;
-    private const uint INFINITE = 0xFFFFFFFF;
-    private const int PROC_THREAD_ATTRIBUTE_MITIGATION_POLICY = 0x00020007;
-    private const uint JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE = 0x00002000;
-    private const int JobObjectExtendedLimitInformation = 9;
-    private const ulong PROCESS_CREATION_MITIGATION_POLICY_CONTROL_FLOW_GUARD_ALWAYS_OFF = 0x00000002UL << 40;
-    private const ulong PROCESS_CREATION_MITIGATION_POLICY2_CET_USER_SHADOW_STACKS_ALWAYS_OFF = 0x00000002UL << 28;
-    private const ulong PROCESS_CREATION_MITIGATION_POLICY2_USER_CET_SET_CONTEXT_IP_VALIDATION_ALWAYS_OFF = 0x00000002UL << 32;
-    private const ulong PROCESS_CREATION_MITIGATION_POLICY2_XTENDED_CONTROL_FLOW_GUARD_ALWAYS_OFF = 0x00000002UL << 40;
+    public const int HostStopExitCode = -2;
+
+    private const uint ExtendedStartupInfoPresent = 0x00080000;
+    private const uint CreateNoWindow = 0x08000000;
+    private const int StartfUseStdHandles = 0x00000100;
+    private const uint HandleFlagInherit = 0x00000001;
+    private const uint Infinite = 0xFFFFFFFF;
+    private const int ProcThreadAttributeMitigationPolicy = 0x00020007;
+    private const uint JobObjectLimitKillOnJobClose = 0x00002000;
+    private const int JobObjectExtendedLimitInformationClass = 9;
+    private const string MitigatedChildFlag = "--sharpemu-mitigated-child";
+    private const string MitigatedChildEnvironment = "SHARPEMU_MITIGATED_CHILD";
+    private const ulong ControlFlowGuardAlwaysOff = 0x00000002UL << 40;
+    private const ulong CetUserShadowStacksAlwaysOff = 0x00000002UL << 28;
+    private const ulong UserCetSetContextIpValidationAlwaysOff = 0x00000002UL << 32;
+
+    private static readonly object EnvironmentGate = new();
 
     private readonly object _sync = new();
     private nint _processHandle;
     private nint _jobHandle;
     private Process? _fallbackProcess;
     private bool _running;
+    private bool _stopRequested;
     private bool _disposed;
 
     public event Action<string, bool>? OutputReceived;
@@ -55,29 +58,34 @@ internal sealed class EmulatorProcess : IDisposable
 
     public void Start(string exePath, IReadOnlyList<string> arguments, string? workingDirectory)
     {
+        ArgumentException.ThrowIfNullOrWhiteSpace(exePath);
+        ArgumentNullException.ThrowIfNull(arguments);
+
         lock (_sync)
         {
-            ObjectDisposedException.ThrowIf(_disposed, this);
+            ThrowIfDisposed();
             if (_running)
             {
                 throw new InvalidOperationException("The emulator process is already running.");
             }
 
-            if (OperatingSystem.IsWindows())
-            {
-                StartWindows(exePath, arguments, workingDirectory);
-            }
-            else
-            {
-                StartFallback(exePath, arguments, workingDirectory);
-            }
-
-            _running = true;
+            _stopRequested = false;
         }
+
+        if (OperatingSystem.IsWindows())
+        {
+            StartWindows(exePath, arguments, workingDirectory);
+            return;
+        }
+
+        StartFallback(exePath, arguments, workingDirectory);
     }
 
     public void Stop()
     {
+        nint processHandle;
+        nint jobHandle;
+        Process? fallbackProcess;
         lock (_sync)
         {
             if (!_running)
@@ -85,28 +93,35 @@ internal sealed class EmulatorProcess : IDisposable
                 return;
             }
 
-            // Prefer terminating the job: it kills the whole tree, including
-            // any children the emulator spawned, even when the main process
-            // is wedged in a GPU driver call.
-            if (_jobHandle != 0)
-            {
-                _ = TerminateJobObject(_jobHandle, 1);
-            }
+            _stopRequested = true;
+            processHandle = _processHandle;
+            jobHandle = _jobHandle;
+            fallbackProcess = _fallbackProcess;
+        }
 
-            if (_processHandle != 0)
-            {
-                _ = TerminateProcess(_processHandle, 1);
-            }
+        if (jobHandle != 0)
+        {
+            _ = TerminateJobObject(jobHandle, unchecked((uint)HostStopExitCode));
+            return;
+        }
 
-            try
+        if (processHandle != 0)
+        {
+            _ = TerminateProcess(processHandle, unchecked((uint)HostStopExitCode));
+            return;
+        }
+
+        try
+        {
+            if (fallbackProcess is { HasExited: false })
             {
-                _fallbackProcess?.Kill(entireProcessTree: true);
-            }
-            catch (InvalidOperationException)
-            {
-                // Already exited.
+                fallbackProcess.Kill(entireProcessTree: true);
             }
         }
+        catch (InvalidOperationException)
+        {
+            // The process exited while Stop was handling the request.
+        }
     }
 
     public void Dispose()
@@ -124,121 +139,206 @@ internal sealed class EmulatorProcess : IDisposable
         Stop();
     }
 
-    private void StartWindows(string exePath, IReadOnlyList<string> arguments, string? workingDirectory)
+    private void StartFallback(string exePath, IReadOnlyList<string> arguments, string? workingDirectory)
     {
-        // The CLI would otherwise relaunch itself into a mitigated child whose
-        // console output cannot flow through our pipes.
-        Environment.SetEnvironmentVariable("SHARPEMU_DISABLE_MITIGATION_RELAUNCH", "1");
-
-        var securityAttributes = new SECURITY_ATTRIBUTES
+        var startInfo = new ProcessStartInfo(exePath)
         {
-            nLength = Marshal.SizeOf<SECURITY_ATTRIBUTES>(),
-            bInheritHandle = 1,
+            WorkingDirectory = string.IsNullOrWhiteSpace(workingDirectory)
+                ? Path.GetDirectoryName(exePath) ?? Environment.CurrentDirectory
+                : workingDirectory,
+            UseShellExecute = false,
+            CreateNoWindow = true,
+            RedirectStandardOutput = true,
+            RedirectStandardError = true,
+            StandardOutputEncoding = Encoding.UTF8,
+            StandardErrorEncoding = Encoding.UTF8,
         };
-
-        if (!CreatePipe(out var stdoutRead, out var stdoutWrite, ref securityAttributes, 0) ||
-            !CreatePipe(out var stderrRead, out var stderrWrite, ref securityAttributes, 0))
+        foreach (var argument in arguments)
         {
-            throw new Win32Exception(Marshal.GetLastWin32Error(), "Failed to create output pipes.");
+            startInfo.ArgumentList.Add(argument);
         }
 
-        _ = SetHandleInformation(stdoutRead, HANDLE_FLAG_INHERIT, 0);
-        _ = SetHandleInformation(stderrRead, HANDLE_FLAG_INHERIT, 0);
+        var process = Process.Start(startInfo)
+            ?? throw new InvalidOperationException("Could not start the emulator process.");
+        process.EnableRaisingEvents = true;
+        process.OutputDataReceived += (_, eventArgs) => ForwardOutput(eventArgs.Data, isError: false);
+        process.ErrorDataReceived += (_, eventArgs) => ForwardOutput(eventArgs.Data, isError: true);
+        process.Exited += (_, _) => OnExited(process.ExitCode);
 
-        var startupInfoEx = new STARTUPINFOEX();
-        startupInfoEx.StartupInfo.cb = Marshal.SizeOf<STARTUPINFOEX>();
-        startupInfoEx.StartupInfo.dwFlags = STARTF_USESTDHANDLES;
-        startupInfoEx.StartupInfo.hStdOutput = stdoutWrite;
-        startupInfoEx.StartupInfo.hStdError = stderrWrite;
+        lock (_sync)
+        {
+            _fallbackProcess = process;
+            _running = true;
+        }
 
+        process.BeginOutputReadLine();
+        process.BeginErrorReadLine();
+    }
+
+    private unsafe void StartWindows(string exePath, IReadOnlyList<string> arguments, string? workingDirectory)
+    {
+        nint stdoutRead = 0;
+        nint stdoutWrite = 0;
+        nint stderrRead = 0;
+        nint stderrWrite = 0;
         nint attributeList = 0;
         nint mitigationPolicies = 0;
+        nint processHandle = 0;
+        nint threadHandle = 0;
+
         try
         {
+            var security = new SecurityAttributes
+            {
+                Size = Marshal.SizeOf<SecurityAttributes>(),
+                InheritHandle = 1,
+            };
+            if (!CreatePipe(out stdoutRead, out stdoutWrite, ref security, 0) ||
+                !CreatePipe(out stderrRead, out stderrWrite, ref security, 0))
+            {
+                throw new InvalidOperationException($"Could not create emulator output pipes (Win32 error {Marshal.GetLastWin32Error()}).");
+            }
+
+            if (!SetHandleInformation(stdoutRead, HandleFlagInherit, 0) ||
+                !SetHandleInformation(stderrRead, HandleFlagInherit, 0))
+            {
+                throw new InvalidOperationException($"Could not configure emulator output pipes (Win32 error {Marshal.GetLastWin32Error()}).");
+            }
+
             nuint attributeListSize = 0;
             _ = InitializeProcThreadAttributeList(0, 1, 0, ref attributeListSize);
             attributeList = Marshal.AllocHGlobal((nint)attributeListSize);
             if (!InitializeProcThreadAttributeList(attributeList, 1, 0, ref attributeListSize))
             {
-                throw new Win32Exception(Marshal.GetLastWin32Error(), "Failed to initialize the process attribute list.");
+                throw new InvalidOperationException($"Could not initialize process mitigation attributes (Win32 error {Marshal.GetLastWin32Error()}).");
             }
 
-            startupInfoEx.lpAttributeList = attributeList;
-
-            var policy1 = PROCESS_CREATION_MITIGATION_POLICY_CONTROL_FLOW_GUARD_ALWAYS_OFF;
-            var policy2 =
-                PROCESS_CREATION_MITIGATION_POLICY2_CET_USER_SHADOW_STACKS_ALWAYS_OFF |
-                PROCESS_CREATION_MITIGATION_POLICY2_USER_CET_SET_CONTEXT_IP_VALIDATION_ALWAYS_OFF;
-
             mitigationPolicies = Marshal.AllocHGlobal(sizeof(ulong) * 2);
-            Marshal.WriteInt64(mitigationPolicies, unchecked((long)policy1));
-            Marshal.WriteInt64(nint.Add(mitigationPolicies, sizeof(long)), unchecked((long)policy2));
-
+            Marshal.WriteInt64(mitigationPolicies, unchecked((long)ControlFlowGuardAlwaysOff));
+            Marshal.WriteInt64(
+                nint.Add(mitigationPolicies, sizeof(long)),
+                unchecked((long)(CetUserShadowStacksAlwaysOff | UserCetSetContextIpValidationAlwaysOff)));
             if (!UpdateProcThreadAttribute(
-                attributeList,
-                0,
-                PROC_THREAD_ATTRIBUTE_MITIGATION_POLICY,
-                mitigationPolicies,
-                (nuint)(sizeof(ulong) * 2),
-                0,
-                0))
+                    attributeList,
+                    0,
+                    (nint)ProcThreadAttributeMitigationPolicy,
+                    mitigationPolicies,
+                    (nuint)(sizeof(ulong) * 2),
+                    0,
+                    0))
             {
-                throw new Win32Exception(Marshal.GetLastWin32Error(), "Failed to apply the mitigation policy.");
+                throw new InvalidOperationException($"Could not apply process mitigations (Win32 error {Marshal.GetLastWin32Error()}).");
             }
 
-            var currentDirectory = workingDirectory ?? Environment.CurrentDirectory;
-            var created = CreateProcessW(
-                exePath,
-                new StringBuilder(BuildCommandLine(exePath, arguments)),
-                0,
-                0,
-                true,
-                EXTENDED_STARTUPINFO_PRESENT | CREATE_NO_WINDOW,
-                0,
-                currentDirectory,
-                ref startupInfoEx,
-                out var processInfo);
+            var startup = new StartupInfoEx();
+            startup.StartupInfo.Size = Marshal.SizeOf<StartupInfoEx>();
+            startup.StartupInfo.Flags = StartfUseStdHandles;
+            startup.StartupInfo.StdOutput = stdoutWrite;
+            startup.StartupInfo.StdError = stderrWrite;
+            startup.AttributeList = attributeList;
 
-            if (!created)
+            var childArguments = new List<string>(arguments.Count + 1) { MitigatedChildFlag };
+            childArguments.AddRange(arguments);
+            var commandLine = new StringBuilder(BuildCommandLine(exePath, childArguments));
+            ProcessInformation processInfo;
+            lock (EnvironmentGate)
             {
-                var error = Marshal.GetLastWin32Error();
-                throw new Win32Exception(error, $"Failed to start '{exePath}' with CET/CFG mitigation disabled (Win32 error {error}: {new Win32Exception(error).Message}).");
+                var previousValue = Environment.GetEnvironmentVariable(MitigatedChildEnvironment);
+                try
+                {
+                    Environment.SetEnvironmentVariable(MitigatedChildEnvironment, "1");
+                    if (!CreateProcessW(
+                            exePath,
+                            commandLine,
+                            0,
+                            0,
+                            true,
+                            ExtendedStartupInfoPresent | CreateNoWindow,
+                            0,
+                            string.IsNullOrWhiteSpace(workingDirectory)
+                                ? Path.GetDirectoryName(exePath) ?? Environment.CurrentDirectory
+                                : workingDirectory,
+                            ref startup,
+                            out processInfo))
+                    {
+                        throw new InvalidOperationException($"Could not start the emulator process (Win32 error {Marshal.GetLastWin32Error()}).");
+                    }
+                }
+                finally
+                {
+                    Environment.SetEnvironmentVariable(MitigatedChildEnvironment, previousValue);
+                }
             }
 
-            CloseHandle(processInfo.hThread);
-            _processHandle = processInfo.hProcess;
+            processHandle = processInfo.Process;
+            threadHandle = processInfo.Thread;
+            CloseHandle(stdoutWrite);
+            stdoutWrite = 0;
+            CloseHandle(stderrWrite);
+            stderrWrite = 0;
 
-            _jobHandle = CreateJobObjectW(0, null);
-            if (_jobHandle != 0 &&
-                (!TryEnableKillOnJobClose(_jobHandle) || !AssignProcessToJobObject(_jobHandle, processInfo.hProcess)))
+            var jobHandle = CreateJobObjectW(0, null);
+            if (jobHandle != 0 &&
+                (!TryEnableKillOnJobClose(jobHandle) || !AssignProcessToJobObject(jobHandle, processHandle)))
             {
-                CloseHandle(_jobHandle);
-                _jobHandle = 0;
+                CloseHandle(jobHandle);
+                jobHandle = 0;
             }
 
-            StartReaderThread(stdoutRead, isError: false);
-            StartReaderThread(stderrRead, isError: true);
-            StartExitWatcherThread();
+            lock (_sync)
+            {
+                _processHandle = processHandle;
+                _jobHandle = jobHandle;
+                _running = true;
+            }
+            processHandle = 0;
+
+            StartPipeReader(stdoutRead, isError: false);
+            stdoutRead = 0;
+            StartPipeReader(stderrRead, isError: true);
+            stderrRead = 0;
+            StartWindowsExitWatcher(_processHandle);
         }
         catch
         {
-            CloseHandle(stdoutRead);
-            CloseHandle(stderrRead);
+            if (processHandle != 0)
+            {
+                _ = TerminateProcess(processHandle, 1);
+            }
+
             throw;
         }
         finally
         {
-            // The child owns duplicated pipe write ends; closing ours lets the
-            // readers observe EOF when the child exits.
-            CloseHandle(stdoutWrite);
-            CloseHandle(stderrWrite);
-
+            if (threadHandle != 0)
+            {
+                CloseHandle(threadHandle);
+            }
+            if (processHandle != 0)
+            {
+                CloseHandle(processHandle);
+            }
+            if (stdoutRead != 0)
+            {
+                CloseHandle(stdoutRead);
+            }
+            if (stdoutWrite != 0)
+            {
+                CloseHandle(stdoutWrite);
+            }
+            if (stderrRead != 0)
+            {
+                CloseHandle(stderrRead);
+            }
+            if (stderrWrite != 0)
+            {
+                CloseHandle(stderrWrite);
+            }
             if (attributeList != 0)
             {
                 DeleteProcThreadAttributeList(attributeList);
                 Marshal.FreeHGlobal(attributeList);
             }
-
             if (mitigationPolicies != 0)
             {
                 Marshal.FreeHGlobal(mitigationPolicies);
@@ -246,103 +346,56 @@ internal sealed class EmulatorProcess : IDisposable
         }
     }
 
-    private void StartFallback(string exePath, IReadOnlyList<string> arguments, string? workingDirectory)
+    private void StartPipeReader(nint handle, bool isError)
     {
-        var startInfo = new ProcessStartInfo
+        var readerThread = new Thread(() =>
         {
-            FileName = exePath,
-            WorkingDirectory = workingDirectory ?? Environment.CurrentDirectory,
-            UseShellExecute = false,
-            CreateNoWindow = true,
-            RedirectStandardOutput = true,
-            RedirectStandardError = true,
-        };
-        foreach (var argument in arguments)
-        {
-            startInfo.ArgumentList.Add(argument);
-        }
-
-        var process = new Process { StartInfo = startInfo, EnableRaisingEvents = true };
-        process.OutputDataReceived += (_, e) =>
-        {
-            if (e.Data is not null)
+            using var safeHandle = new SafeFileHandle(handle, ownsHandle: true);
+            using var stream = new FileStream(safeHandle, FileAccess.Read, 4096, isAsync: false);
+            using var reader = new StreamReader(stream, Encoding.UTF8, detectEncodingFromByteOrderMarks: true);
+            while (reader.ReadLine() is { } line)
             {
-                OutputReceived?.Invoke(e.Data, false);
+                ForwardOutput(line, isError);
             }
-        };
-        process.ErrorDataReceived += (_, e) =>
-        {
-            if (e.Data is not null)
-            {
-                OutputReceived?.Invoke(e.Data, true);
-            }
-        };
-        process.Exited += (_, _) =>
-        {
-            int exitCode;
-            try
-            {
-                exitCode = process.ExitCode;
-            }
-            catch (InvalidOperationException)
-            {
-                exitCode = -1;
-            }
-
-            OnExited(exitCode);
-        };
-
-        process.Start();
-        process.BeginOutputReadLine();
-        process.BeginErrorReadLine();
-        _fallbackProcess = process;
-    }
-
-    private void StartReaderThread(nint readHandle, bool isError)
-    {
-        var thread = new Thread(() =>
-        {
-            using var stream = new FileStream(new SafeFileHandle(readHandle, ownsHandle: true), FileAccess.Read);
-            using var reader = new StreamReader(stream, Encoding.UTF8);
-            try
-            {
-                while (reader.ReadLine() is { } line)
-                {
-                    OutputReceived?.Invoke(line, isError);
-                }
-            }
-            catch (IOException)
-            {
-                // Pipe broken on process teardown.
-            }
-        })
+        }, 256 * 1024)
         {
             IsBackground = true,
             Name = isError ? "SharpEmu stderr reader" : "SharpEmu stdout reader",
         };
-        thread.Start();
+        readerThread.Start();
     }
 
-    private void StartExitWatcherThread()
+    private void StartWindowsExitWatcher(nint processHandle)
     {
-        var processHandle = _processHandle;
-        var thread = new Thread(() =>
+        var watcher = new Thread(() =>
         {
-            _ = WaitForSingleObject(processHandle, INFINITE);
-            var exitCode = GetExitCodeProcess(processHandle, out var rawExitCode)
-                ? unchecked((int)rawExitCode)
-                : -1;
+            _ = WaitForSingleObject(processHandle, Infinite);
+            var exitCode = 1;
+            if (GetExitCodeProcess(processHandle, out var nativeExitCode))
+            {
+                exitCode = unchecked((int)nativeExitCode);
+            }
+
             OnExited(exitCode);
-        })
+        }, 128 * 1024)
         {
             IsBackground = true,
             Name = "SharpEmu exit watcher",
         };
-        thread.Start();
+        watcher.Start();
     }
 
-    private void OnExited(int exitCode)
+    private void ForwardOutput(string? line, bool isError)
     {
+        if (!string.IsNullOrEmpty(line))
+        {
+            OutputReceived?.Invoke(line, isError);
+        }
+    }
+
+    private void OnExited(int nativeExitCode)
+    {
+        int exitCode;
         lock (_sync)
         {
             if (!_running)
@@ -350,13 +403,13 @@ internal sealed class EmulatorProcess : IDisposable
                 return;
             }
 
+            exitCode = _stopRequested ? HostStopExitCode : nativeExitCode;
             _running = false;
             if (_processHandle != 0)
             {
                 CloseHandle(_processHandle);
                 _processHandle = 0;
             }
-
             if (_jobHandle != 0)
             {
                 CloseHandle(_jobHandle);
@@ -372,24 +425,19 @@ internal sealed class EmulatorProcess : IDisposable
 
     private static bool TryEnableKillOnJobClose(nint jobHandle)
     {
-        var extendedLimitInfo = new JOBOBJECT_EXTENDED_LIMIT_INFORMATION
+        var info = new JobObjectExtendedLimitInformation
         {
-            BasicLimitInformation = new JOBOBJECT_BASIC_LIMIT_INFORMATION
+            BasicLimitInformation = new JobObjectBasicLimitInformation
             {
-                LimitFlags = JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE,
+                LimitFlags = JobObjectLimitKillOnJobClose,
             },
         };
-
-        var size = Marshal.SizeOf<JOBOBJECT_EXTENDED_LIMIT_INFORMATION>();
+        var size = Marshal.SizeOf<JobObjectExtendedLimitInformation>();
         var memory = Marshal.AllocHGlobal(size);
         try
         {
-            Marshal.StructureToPtr(extendedLimitInfo, memory, false);
-            return SetInformationJobObject(
-                jobHandle,
-                JobObjectExtendedLimitInformation,
-                memory,
-                unchecked((uint)size));
+            Marshal.StructureToPtr(info, memory, false);
+            return SetInformationJobObject(jobHandle, JobObjectExtendedLimitInformationClass, memory, unchecked((uint)size));
         }
         finally
         {
@@ -397,128 +445,124 @@ internal sealed class EmulatorProcess : IDisposable
         }
     }
 
-    private static string BuildCommandLine(string processPath, IReadOnlyList<string> args)
+    private static string BuildCommandLine(string processPath, IReadOnlyList<string> arguments)
     {
-        var builder = new StringBuilder();
-        builder.Append(QuoteArgument(processPath));
-        for (var i = 0; i < args.Count; i++)
+        var builder = new StringBuilder(QuoteArgument(processPath));
+        foreach (var argument in arguments)
         {
             builder.Append(' ');
-            builder.Append(QuoteArgument(args[i]));
+            builder.Append(QuoteArgument(argument));
         }
 
         return builder.ToString();
     }
 
-    private static string QuoteArgument(string argument)
+    private static string QuoteArgument(string value)
     {
-        if (argument.Length == 0)
+        if (value.Length == 0)
         {
             return "\"\"";
         }
 
-        var needsQuotes = false;
-        foreach (var c in argument)
+        if (!value.Any(static c => char.IsWhiteSpace(c) || c == '"'))
         {
-            if (char.IsWhiteSpace(c) || c == '"')
-            {
-                needsQuotes = true;
-                break;
-            }
+            return value;
         }
 
-        if (!needsQuotes)
-        {
-            return argument;
-        }
-
-        var builder = new StringBuilder(argument.Length + 2);
+        var builder = new StringBuilder(value.Length + 2);
         builder.Append('"');
-
-        var backslashCount = 0;
-        foreach (var c in argument)
+        var slashCount = 0;
+        foreach (var character in value)
         {
-            if (c == '\\')
+            if (character == '\\')
             {
-                backslashCount++;
+                slashCount++;
                 continue;
             }
 
-            if (c == '"')
+            if (character == '"')
             {
-                builder.Append('\\', (backslashCount * 2) + 1);
-                builder.Append('"');
-                backslashCount = 0;
+                builder.Append('\\', (slashCount * 2) + 1);
+                builder.Append(character);
+                slashCount = 0;
                 continue;
             }
 
-            if (backslashCount > 0)
+            if (slashCount > 0)
             {
-                builder.Append('\\', backslashCount);
-                backslashCount = 0;
+                builder.Append('\\', slashCount);
+                slashCount = 0;
             }
 
-            builder.Append(c);
+            builder.Append(character);
         }
 
-        if (backslashCount > 0)
+        if (slashCount > 0)
         {
-            builder.Append('\\', backslashCount * 2);
+            builder.Append('\\', slashCount * 2);
         }
 
         builder.Append('"');
         return builder.ToString();
     }
 
-    [StructLayout(LayoutKind.Sequential)]
-    private struct SECURITY_ATTRIBUTES
+    private void ThrowIfDisposed()
     {
-        public int nLength;
-        public nint lpSecurityDescriptor;
-        public int bInheritHandle;
+        if (_disposed)
+        {
+            throw new ObjectDisposedException(nameof(EmulatorProcess));
+        }
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    private struct SecurityAttributes
+    {
+        public int Size;
+        public nint SecurityDescriptor;
+        public int InheritHandle;
     }
 
     [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
-    private struct STARTUPINFO
+    private struct StartupInfo
     {
-        public int cb;
-        public nint lpReserved;
-        public nint lpDesktop;
-        public nint lpTitle;
-        public int dwX;
-        public int dwY;
-        public int dwXSize;
-        public int dwYSize;
-        public int dwXCountChars;
-        public int dwYCountChars;
-        public int dwFillAttribute;
-        public int dwFlags;
-        public short wShowWindow;
-        public short cbReserved2;
-        public nint lpReserved2;
-        public nint hStdInput;
-        public nint hStdOutput;
-        public nint hStdError;
+        public int Size;
+        public nint Reserved;
+        public nint Desktop;
+        public nint Title;
+        public int X;
+        public int Y;
+        public int XSize;
+        public int YSize;
+        public int XCountChars;
+        public int YCountChars;
+        public int FillAttribute;
+        public int Flags;
+        public short ShowWindow;
+        public short Reserved2Count;
+        public nint Reserved2;
+        public nint StdInput;
+        public nint StdOutput;
+        public nint StdError;
     }
 
     [StructLayout(LayoutKind.Sequential)]
-    private struct STARTUPINFOEX
+    private struct StartupInfoEx
     {
-        public STARTUPINFO StartupInfo;
-        public nint lpAttributeList;
+        public StartupInfo StartupInfo;
+        public nint AttributeList;
     }
 
     [StructLayout(LayoutKind.Sequential)]
-    private struct PROCESS_INFORMATION
+    private struct ProcessInformation
     {
-        public nint hProcess;
-        public nint hThread;
-        public int dwProcessId;
-        public int dwThreadId;
+        public nint Process;
+        public nint Thread;
+        public int ProcessId;
+        public int ThreadId;
     }
 
     [StructLayout(LayoutKind.Sequential)]
-    private struct JOBOBJECT_BASIC_LIMIT_INFORMATION
+    private struct JobObjectBasicLimitInformation
     {
         public long PerProcessUserTimeLimit;
         public long PerJobUserTimeLimit;
@@ -532,7 +576,7 @@ internal sealed class EmulatorProcess : IDisposable
     }
 
     [StructLayout(LayoutKind.Sequential)]
-    private struct IO_COUNTERS
+    private struct IoCounters
     {
         public ulong ReadOperationCount;
         public ulong WriteOperationCount;
@@ -543,10 +587,10 @@ internal sealed class EmulatorProcess : IDisposable
     }
 
     [StructLayout(LayoutKind.Sequential)]
-    private struct JOBOBJECT_EXTENDED_LIMIT_INFORMATION
+    private struct JobObjectExtendedLimitInformation
     {
-        public JOBOBJECT_BASIC_LIMIT_INFORMATION BasicLimitInformation;
-        public IO_COUNTERS IoInfo;
+        public JobObjectBasicLimitInformation BasicLimitInformation;
+        public IoCounters IoInfo;
         public nuint ProcessMemoryLimit;
         public nuint JobMemoryLimit;
         public nuint PeakProcessMemoryUsed;
@@ -555,66 +599,37 @@ internal sealed class EmulatorProcess : IDisposable
 
     [DllImport("kernel32.dll", SetLastError = true)]
     [return: MarshalAs(UnmanagedType.Bool)]
-    private static extern bool CreatePipe(
-        out nint hReadPipe,
-        out nint hWritePipe,
-        ref SECURITY_ATTRIBUTES lpPipeAttributes,
-        uint nSize);
+    private static extern bool CreatePipe(out nint readPipe, out nint writePipe, ref SecurityAttributes attributes, uint size);
 
     [DllImport("kernel32.dll", SetLastError = true)]
     [return: MarshalAs(UnmanagedType.Bool)]
-    private static extern bool SetHandleInformation(nint hObject, uint dwMask, uint dwFlags);
+    private static extern bool SetHandleInformation(nint handle, uint mask, uint flags);
 
     [DllImport("kernel32.dll", SetLastError = true)]
     [return: MarshalAs(UnmanagedType.Bool)]
-    private static extern bool InitializeProcThreadAttributeList(
-        nint lpAttributeList,
-        int dwAttributeCount,
-        int dwFlags,
-        ref nuint lpSize);
+    private static extern bool InitializeProcThreadAttributeList(nint list, int count, int flags, ref nuint size);
 
     [DllImport("kernel32.dll", SetLastError = true)]
     [return: MarshalAs(UnmanagedType.Bool)]
-    private static extern bool UpdateProcThreadAttribute(
-        nint lpAttributeList,
-        uint dwFlags,
-        nint attribute,
-        nint lpValue,
-        nuint cbSize,
-        nint lpPreviousValue,
-        nint lpReturnSize);
+    private static extern bool UpdateProcThreadAttribute(nint list, uint flags, nint attribute, nint value, nuint size, nint previousValue, nint returnSize);
 
     [DllImport("kernel32.dll")]
-    private static extern void DeleteProcThreadAttributeList(nint lpAttributeList);
+    private static extern void DeleteProcThreadAttributeList(nint list);
 
     [DllImport("kernel32.dll", EntryPoint = "CreateJobObjectW", SetLastError = true, CharSet = CharSet.Unicode)]
-    private static extern nint CreateJobObjectW(nint lpJobAttributes, string? lpName);
+    private static extern nint CreateJobObjectW(nint attributes, string? name);
 
     [DllImport("kernel32.dll", SetLastError = true)]
     [return: MarshalAs(UnmanagedType.Bool)]
-    private static extern bool SetInformationJobObject(
-        nint hJob,
-        int jobObjectInfoClass,
-        nint lpJobObjectInfo,
-        uint cbJobObjectInfoLength);
+    private static extern bool SetInformationJobObject(nint job, int infoClass, nint info, uint size);
 
     [DllImport("kernel32.dll", SetLastError = true)]
     [return: MarshalAs(UnmanagedType.Bool)]
-    private static extern bool AssignProcessToJobObject(nint hJob, nint hProcess);
+    private static extern bool AssignProcessToJobObject(nint job, nint process);
 
     [DllImport("kernel32.dll", EntryPoint = "CreateProcessW", SetLastError = true, CharSet = CharSet.Unicode)]
     [return: MarshalAs(UnmanagedType.Bool)]
-    private static extern bool CreateProcessW(
-        string applicationName,
-        StringBuilder commandLine,
-        nint processAttributes,
-        nint threadAttributes,
-        [MarshalAs(UnmanagedType.Bool)] bool inheritHandles,
-        uint creationFlags,
-        nint environment,
-        string currentDirectory,
-        ref STARTUPINFOEX startupInfo,
-        out PROCESS_INFORMATION processInformation);
+    private static extern bool CreateProcessW(string applicationName, StringBuilder commandLine, nint processAttributes, nint threadAttributes, [MarshalAs(UnmanagedType.Bool)] bool inheritHandles, uint flags, nint environment, string currentDirectory, ref StartupInfoEx startupInfo, out ProcessInformation processInformation);
 
     [DllImport("kernel32.dll", SetLastError = true)]
     private static extern uint WaitForSingleObject(nint handle, uint milliseconds);

src/SharpEmu.GUI/GameSurfaceHost.cs

@@ -0,0 +1,613 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Platform;
+using Avalonia.Threading;
+using SharpEmu.Libs.VideoOut;
+using System.Runtime.InteropServices;
+
+namespace SharpEmu.GUI;
+
+/// <summary>
+/// Native child surface owned by Avalonia. The isolated emulator process uses
+/// its platform handle to create the Vulkan presentation surface, keeping the
+/// guest address space out of the GUI process.
+/// </summary>
+public sealed class GameSurfaceHost : NativeControlHost
+{
+    private const uint SwpNoSize = 0x0001;
+    private const uint SwpNoMove = 0x0002;
+    private const uint SwpNoZOrder = 0x0004;
+    private const uint SwpNoActivate = 0x0010;
+    private const uint SwpShowWindow = 0x0040;
+    private const uint SwpHideWindow = 0x0080;
+    private const uint WsChild = 0x40000000;
+    private const uint WsVisible = 0x10000000;
+    private const uint WsClipSiblings = 0x04000000;
+    private const uint WsClipChildren = 0x02000000;
+    private const uint CsOwnDc = 0x0020;
+    private const uint WmSetCursor = 0x0020;
+    private const uint WmMouseMove = 0x0200;
+    private const int IdcArrow = 32512;
+    private const int CursorHideDelayMs = 2500;
+
+    private VulkanHostSurface? _surface;
+    private nint _windowHandle;
+    private nint _x11Display;
+    private string? _win32ClassName;
+    private WindowProcedure? _windowProcedure;
+    private nint _metalLayer;
+    private bool _presentationVisible = true;
+    private DispatcherTimer? _cursorIdleTimer;
+    private bool _cursorAutoHide;
+    private bool _cursorHidden;
+    private long _lastPointerActivity;
+
+    public GameSurfaceHost()
+    {
+        PropertyChanged += (_, change) =>
+        {
+            if (change.Property == BoundsProperty)
+            {
+                UpdateSurfaceSize();
+            }
+        };
+        LayoutUpdated += (_, _) =>
+        {
+            // Fullscreen can change a monitor's DPI scale without changing
+            // the logical Bounds. Refresh the native child from physical size.
+            UpdateSurfaceSize();
+
+            // NativeControlHost may make its HWND visible again as part of a
+            // later arrange pass. Keep a loading surface hidden until its
+            // child process reports a real first frame.
+            if (!_presentationVisible)
+            {
+                ApplyPresentationVisibility();
+            }
+        };
+    }
+
+    public event EventHandler<VulkanHostSurface>? SurfaceAvailable;
+
+    public event EventHandler<VulkanHostSurface>? SurfaceDestroyed;
+
+    public VulkanHostSurface? Surface => _surface;
+
+    public void RefreshSurfaceSize() => UpdateSurfaceSize();
+
+    /// <summary>
+    /// Hides the platform child without detaching the Vulkan surface. This
+    /// allows the launcher to return to its library while guest teardown is
+    /// still finishing on the render thread.
+    /// </summary>
+    public void SetPresentationVisible(bool visible)
+    {
+        _presentationVisible = visible;
+        ApplyPresentationVisibility();
+    }
+
+    /// <summary>
+    /// Auto-hides the mouse cursor over the game surface after a short idle
+    /// period; any pointer movement brings it back. Enabling (again) restarts
+    /// the idle countdown, so both "first frame presented" and "entered
+    /// fullscreen" can arm it. Windows-only; a no-op elsewhere.
+    /// </summary>
+    public void SetCursorAutoHide(bool enabled)
+    {
+        if (!OperatingSystem.IsWindows())
+        {
+            return;
+        }
+
+        _cursorAutoHide = enabled;
+        _lastPointerActivity = System.Diagnostics.Stopwatch.GetTimestamp();
+        if (enabled)
+        {
+            _cursorIdleTimer ??= CreateCursorIdleTimer();
+            _cursorIdleTimer.Start();
+            return;
+        }
+
+        _cursorIdleTimer?.Stop();
+        ShowCursorNow();
+    }
+
+    private DispatcherTimer CreateCursorIdleTimer()
+    {
+        var timer = new DispatcherTimer
+        {
+            Interval = TimeSpan.FromMilliseconds(250),
+        };
+        timer.Tick += (_, _) => HideCursorWhenIdle();
+        return timer;
+    }
+
+    private void HideCursorWhenIdle()
+    {
+        if (!_cursorAutoHide || _cursorHidden || _windowHandle == 0)
+        {
+            return;
+        }
+
+        var idleMs = (System.Diagnostics.Stopwatch.GetTimestamp() - _lastPointerActivity) *
+            1000 / System.Diagnostics.Stopwatch.Frequency;
+        if (idleMs < CursorHideDelayMs)
+        {
+            return;
+        }
+
+        // Only swallow the cursor while it is actually over the game surface;
+        // hovering launcher chrome (console, toolbar) must keep the arrow.
+        if (!GetCursorPos(out var point) || WindowFromPoint(point) != _windowHandle)
+        {
+            return;
+        }
+
+        _cursorHidden = true;
+        _ = SetCursor(0);
+    }
+
+    private void ShowCursorNow()
+    {
+        if (!_cursorHidden)
+        {
+            return;
+        }
+
+        _cursorHidden = false;
+        _ = SetCursor(LoadCursorW(0, IdcArrow));
+    }
+
+    private void ApplyPresentationVisibility()
+    {
+        if (_windowHandle == 0)
+        {
+            return;
+        }
+
+        var visible = _presentationVisible;
+        if (OperatingSystem.IsWindows())
+        {
+            // SW_HIDE can be ignored for a window's initial show state. Force
+            // the state through SetWindowPos so an old child swapchain cannot
+            // remain composed while the next game is loading.
+            var flags = SwpNoSize | SwpNoMove | SwpNoZOrder | SwpNoActivate |
+                (visible ? SwpShowWindow : SwpHideWindow);
+            _ = SetWindowPos(_windowHandle, 0, 0, 0, 0, 0, flags);
+        }
+        else if (OperatingSystem.IsLinux() && _x11Display != 0)
+        {
+            _ = visible
+                ? XMapWindow(_x11Display, _windowHandle)
+                : XUnmapWindow(_x11Display, _windowHandle);
+            _ = XFlush(_x11Display);
+        }
+        else if (OperatingSystem.IsMacOS())
+        {
+            SendBool(_windowHandle, "setHidden:", !visible);
+        }
+    }
+
+    protected override IPlatformHandle CreateNativeControlCore(IPlatformHandle control)
+    {
+        PlatformHandle handle;
+        if (OperatingSystem.IsWindows())
+        {
+            handle = CreateWin32(control);
+        }
+        else if (OperatingSystem.IsLinux())
+        {
+            handle = CreateX11(control);
+        }
+        else if (OperatingSystem.IsMacOS())
+        {
+            handle = CreateMacOS();
+        }
+        else
+        {
+            throw new PlatformNotSupportedException("SharpEmu's embedded Vulkan surface is unsupported on this platform.");
+        }
+
+        UpdateSurfaceSize();
+        if (_surface is { } surface)
+        {
+            SurfaceAvailable?.Invoke(this, surface);
+        }
+
+        return handle;
+    }
+
+    protected override void DestroyNativeControlCore(IPlatformHandle control)
+    {
+        if (OperatingSystem.IsWindows())
+        {
+            SetCursorAutoHide(false);
+        }
+
+        var surface = _surface;
+        _surface = null;
+
+        if (OperatingSystem.IsWindows())
+        {
+            DestroyWin32();
+        }
+        else if (OperatingSystem.IsLinux())
+        {
+            DestroyX11();
+        }
+        else if (OperatingSystem.IsMacOS())
+        {
+            DestroyMacOS();
+        }
+
+        if (surface is not null)
+        {
+            SurfaceDestroyed?.Invoke(this, surface);
+        }
+    }
+
+    private PlatformHandle CreateWin32(IPlatformHandle control)
+    {
+        _win32ClassName = $"SharpEmuGameSurface-{Guid.NewGuid():N}";
+        _windowProcedure = WindowProcedureImpl;
+        var classInfo = new WndClassEx
+        {
+            Size = (uint)Marshal.SizeOf<WndClassEx>(),
+            Style = CsOwnDc,
+            WindowProcedure = Marshal.GetFunctionPointerForDelegate(_windowProcedure),
+            Instance = GetModuleHandleW(null),
+            ClassName = _win32ClassName,
+        };
+
+        if (RegisterClassExW(ref classInfo) == 0)
+        {
+            throw new InvalidOperationException($"Could not register the embedded game window class (Win32 error {Marshal.GetLastWin32Error()}).");
+        }
+
+        _windowHandle = CreateWindowExW(
+            0,
+            _win32ClassName,
+            "SharpEmu Game Surface",
+            WsChild | (_presentationVisible ? WsVisible : 0) | WsClipSiblings | WsClipChildren,
+            0,
+            0,
+            1,
+            1,
+            control.Handle,
+            0,
+            classInfo.Instance,
+            0);
+        if (_windowHandle == 0)
+        {
+            var error = Marshal.GetLastWin32Error();
+            _ = UnregisterClassW(_win32ClassName, classInfo.Instance);
+            throw new InvalidOperationException($"Could not create the embedded game window (Win32 error {error}).");
+        }
+
+        _surface = new VulkanHostSurface(
+            VulkanHostSurfaceKind.Win32,
+            _windowHandle,
+            classInfo.Instance);
+        return new PlatformHandle(_windowHandle, "HWND");
+    }
+
+    private PlatformHandle CreateX11(IPlatformHandle control)
+    {
+        _x11Display = XOpenDisplay(0);
+        if (_x11Display == 0)
+        {
+            throw new InvalidOperationException("Could not connect to the X11 server for the embedded game surface.");
+        }
+
+        _windowHandle = XCreateSimpleWindow(
+            _x11Display,
+            control.Handle,
+            0,
+            0,
+            1,
+            1,
+            0,
+            0,
+            0);
+        if (_windowHandle == 0)
+        {
+            XCloseDisplay(_x11Display);
+            _x11Display = 0;
+            throw new InvalidOperationException("Could not create the X11 embedded game surface.");
+        }
+
+        if (_presentationVisible)
+        {
+            _ = XMapWindow(_x11Display, _windowHandle);
+        }
+        _ = XFlush(_x11Display);
+        _surface = new VulkanHostSurface(VulkanHostSurfaceKind.Xlib, _windowHandle, _x11Display);
+        return new PlatformHandle(_windowHandle, "X11");
+    }
+
+    private PlatformHandle CreateMacOS()
+    {
+        _metalLayer = CreateObjectiveCObject("CAMetalLayer");
+        _windowHandle = CreateObjectiveCObject("NSView");
+        SendBool(_windowHandle, "setWantsLayer:", true);
+        SendPointer(_windowHandle, "setLayer:", _metalLayer);
+        SendBool(_windowHandle, "setHidden:", !_presentationVisible);
+
+        _surface = new VulkanHostSurface(VulkanHostSurfaceKind.Metal, _windowHandle, metalLayerHandle: _metalLayer);
+        return new PlatformHandle(_windowHandle, "NSView");
+    }
+
+    private void UpdateSurfaceSize()
+    {
+        if (_surface is null)
+        {
+            return;
+        }
+
+        var renderScale = (VisualRoot as TopLevel)?.RenderScaling ?? 1.0;
+        var width = Math.Max(1, (int)Math.Round(Bounds.Width * renderScale));
+        var height = Math.Max(1, (int)Math.Round(Bounds.Height * renderScale));
+        var sizeChanged = _surface.PixelWidth != width || _surface.PixelHeight != height;
+        _surface.UpdatePixelSize(width, height);
+
+        if (!sizeChanged)
+        {
+            return;
+        }
+
+        if (OperatingSystem.IsWindows() && _windowHandle != 0)
+        {
+            _ = SetWindowPos(
+                _windowHandle,
+                0,
+                0,
+                0,
+                width,
+                height,
+                SwpNoMove | SwpNoZOrder | SwpNoActivate);
+        }
+        else if (OperatingSystem.IsLinux() && _x11Display != 0 && _windowHandle != 0)
+        {
+            _ = XResizeWindow(_x11Display, _windowHandle, (uint)width, (uint)height);
+            _ = XFlush(_x11Display);
+        }
+        else if (OperatingSystem.IsMacOS() && _metalLayer != 0)
+        {
+            SendDouble(_metalLayer, "setContentsScale:", renderScale);
+        }
+    }
+
+    private void DestroyWin32()
+    {
+        if (_windowHandle != 0)
+        {
+            _ = DestroyWindow(_windowHandle);
+            _windowHandle = 0;
+        }
+
+        if (!string.IsNullOrWhiteSpace(_win32ClassName))
+        {
+            _ = UnregisterClassW(_win32ClassName, GetModuleHandleW(null));
+            _win32ClassName = null;
+        }
+
+        _windowProcedure = null;
+    }
+
+    private void DestroyX11()
+    {
+        if (_x11Display != 0 && _windowHandle != 0)
+        {
+            _ = XDestroyWindow(_x11Display, _windowHandle);
+        }
+        if (_x11Display != 0)
+        {
+            _ = XCloseDisplay(_x11Display);
+        }
+
+        _windowHandle = 0;
+        _x11Display = 0;
+    }
+
+    private void DestroyMacOS()
+    {
+        if (_windowHandle != 0)
+        {
+            SendVoid(_windowHandle, "release");
+        }
+        if (_metalLayer != 0)
+        {
+            SendVoid(_metalLayer, "release");
+        }
+
+        _windowHandle = 0;
+        _metalLayer = 0;
+    }
+
+    private nint WindowProcedureImpl(nint window, uint message, nint wParam, nint lParam)
+    {
+        if (message == WmMouseMove)
+        {
+            _lastPointerActivity = System.Diagnostics.Stopwatch.GetTimestamp();
+            ShowCursorNow();
+        }
+        else if (message == WmSetCursor && _cursorHidden)
+        {
+            // Win32 re-resolves the cursor on every mouse message; returning
+            // TRUE here keeps the parent chain from restoring the arrow.
+            _ = SetCursor(0);
+            return 1;
+        }
+
+        return DefWindowProcW(window, message, wParam, lParam);
+    }
+
+    private static nint CreateObjectiveCObject(string className)
+    {
+        var classHandle = objc_getClass(className);
+        if (classHandle == 0)
+        {
+            throw new InvalidOperationException($"Objective-C class '{className}' is unavailable.");
+        }
+
+        var instance = objc_msgSend_id(classHandle, sel_registerName("alloc"));
+        instance = objc_msgSend_id(instance, sel_registerName("init"));
+        if (instance == 0)
+        {
+            throw new InvalidOperationException($"Could not create Objective-C '{className}'.");
+        }
+
+        return instance;
+    }
+
+    private static void SendVoid(nint receiver, string selector) =>
+        objc_msgSend_void(receiver, sel_registerName(selector));
+
+    private static void SendBool(nint receiver, string selector, bool value) =>
+        objc_msgSend_bool(receiver, sel_registerName(selector), value ? (byte)1 : (byte)0);
+
+    private static void SendPointer(nint receiver, string selector, nint value) =>
+        objc_msgSend_pointer(receiver, sel_registerName(selector), value);
+
+    private static void SendDouble(nint receiver, string selector, double value) =>
+        objc_msgSend_double(receiver, sel_registerName(selector), value);
+
+    private delegate nint WindowProcedure(nint window, uint message, nint wParam, nint lParam);
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+    private struct WndClassEx
+    {
+        public uint Size;
+        public uint Style;
+        public nint WindowProcedure;
+        public int ClassExtra;
+        public int WindowExtra;
+        public nint Instance;
+        public nint Icon;
+        public nint Cursor;
+        public nint Background;
+        public string? MenuName;
+        public string? ClassName;
+        public nint IconSmall;
+    }
+
+    [DllImport("kernel32.dll", EntryPoint = "GetModuleHandleW", CharSet = CharSet.Unicode)]
+    private static extern nint GetModuleHandleW(string? moduleName);
+
+    [DllImport("user32.dll", EntryPoint = "RegisterClassExW", SetLastError = true, CharSet = CharSet.Unicode)]
+    private static extern ushort RegisterClassExW(ref WndClassEx classInfo);
+
+    [DllImport("user32.dll", EntryPoint = "UnregisterClassW", SetLastError = true, CharSet = CharSet.Unicode)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool UnregisterClassW(string className, nint instance);
+
+    [DllImport("user32.dll", EntryPoint = "CreateWindowExW", SetLastError = true, CharSet = CharSet.Unicode)]
+    private static extern nint CreateWindowExW(
+        uint extendedStyle,
+        string className,
+        string windowName,
+        uint style,
+        int x,
+        int y,
+        int width,
+        int height,
+        nint parent,
+        nint menu,
+        nint instance,
+        nint parameter);
+
+    [DllImport("user32.dll", EntryPoint = "DestroyWindow", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool DestroyWindow(nint window);
+
+    [DllImport("user32.dll", EntryPoint = "SetWindowPos", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool SetWindowPos(
+        nint window,
+        nint insertAfter,
+        int x,
+        int y,
+        int width,
+        int height,
+        uint flags);
+
+    [DllImport("user32.dll", EntryPoint = "DefWindowProcW", CharSet = CharSet.Unicode)]
+    private static extern nint DefWindowProcW(nint window, uint message, nint wParam, nint lParam);
+
+    [DllImport("user32.dll", EntryPoint = "SetCursor")]
+    private static extern nint SetCursor(nint cursor);
+
+    [DllImport("user32.dll", EntryPoint = "LoadCursorW", CharSet = CharSet.Unicode)]
+    private static extern nint LoadCursorW(nint instance, nint cursorName);
+
+    [DllImport("user32.dll", EntryPoint = "GetCursorPos")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool GetCursorPos(out NativePoint point);
+
+    [DllImport("user32.dll", EntryPoint = "WindowFromPoint")]
+    private static extern nint WindowFromPoint(NativePoint point);
+
+    [StructLayout(LayoutKind.Sequential)]
+    private struct NativePoint
+    {
+        public int X;
+        public int Y;
+    }
+
+    [DllImport("libX11.so.6", EntryPoint = "XOpenDisplay")]
+    private static extern nint XOpenDisplay(nint displayName);
+
+    [DllImport("libX11.so.6", EntryPoint = "XCreateSimpleWindow")]
+    private static extern nint XCreateSimpleWindow(
+        nint display,
+        nint parent,
+        int x,
+        int y,
+        uint width,
+        uint height,
+        uint borderWidth,
+        ulong border,
+        ulong background);
+
+    [DllImport("libX11.so.6", EntryPoint = "XMapWindow")]
+    private static extern int XMapWindow(nint display, nint window);
+
+    [DllImport("libX11.so.6", EntryPoint = "XUnmapWindow")]
+    private static extern int XUnmapWindow(nint display, nint window);
+
+    [DllImport("libX11.so.6", EntryPoint = "XResizeWindow")]
+    private static extern int XResizeWindow(nint display, nint window, uint width, uint height);
+
+    [DllImport("libX11.so.6", EntryPoint = "XDestroyWindow")]
+    private static extern int XDestroyWindow(nint display, nint window);
+
+    [DllImport("libX11.so.6", EntryPoint = "XCloseDisplay")]
+    private static extern int XCloseDisplay(nint display);
+
+    [DllImport("libX11.so.6", EntryPoint = "XFlush")]
+    private static extern int XFlush(nint display);
+
+    [DllImport("/usr/lib/libobjc.A.dylib")]
+    private static extern nint objc_getClass(string name);
+
+    [DllImport("/usr/lib/libobjc.A.dylib")]
+    private static extern nint sel_registerName(string name);
+
+    [DllImport("/usr/lib/libobjc.A.dylib", EntryPoint = "objc_msgSend")]
+    private static extern nint objc_msgSend_id(nint receiver, nint selector);
+
+    [DllImport("/usr/lib/libobjc.A.dylib", EntryPoint = "objc_msgSend")]
+    private static extern void objc_msgSend_void(nint receiver, nint selector);
+
+    [DllImport("/usr/lib/libobjc.A.dylib", EntryPoint = "objc_msgSend")]
+    private static extern void objc_msgSend_bool(nint receiver, nint selector, byte value);
+
+    [DllImport("/usr/lib/libobjc.A.dylib", EntryPoint = "objc_msgSend")]
+    private static extern void objc_msgSend_pointer(nint receiver, nint selector, nint value);
+
+    [DllImport("/usr/lib/libobjc.A.dylib", EntryPoint = "objc_msgSend")]
+    private static extern void objc_msgSend_double(nint receiver, nint selector, double value);
+}

src/SharpEmu.GUI/GuiConsoleMirror.cs

@@ -0,0 +1,116 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Text;
+
+namespace SharpEmu.GUI;
+
+/// <summary>
+/// Mirrors process-wide console output into the launcher console while
+/// retaining the original streams for shell users and file logging.
+/// </summary>
+internal sealed class GuiConsoleMirror : IDisposable
+{
+    private readonly TextWriter _originalOut;
+    private readonly TextWriter _originalError;
+    private int _disposed;
+
+    private GuiConsoleMirror(Action<string, bool> writeLine)
+    {
+        _originalOut = Console.Out;
+        _originalError = Console.Error;
+        Console.SetOut(new MirroringWriter(_originalOut, line => writeLine(line, false)));
+        Console.SetError(new MirroringWriter(_originalError, line => writeLine(line, true)));
+    }
+
+    public static GuiConsoleMirror Install(Action<string, bool> writeLine) => new(writeLine);
+
+    public void Dispose()
+    {
+        if (Interlocked.Exchange(ref _disposed, 1) != 0)
+        {
+            return;
+        }
+
+        Console.SetOut(_originalOut);
+        Console.SetError(_originalError);
+    }
+
+    private sealed class MirroringWriter : TextWriter
+    {
+        private readonly TextWriter _inner;
+        private readonly Action<string> _writeLine;
+        private readonly StringBuilder _line = new();
+        private readonly object _gate = new();
+
+        public MirroringWriter(TextWriter inner, Action<string> writeLine)
+        {
+            _inner = inner;
+            _writeLine = writeLine;
+        }
+
+        public override Encoding Encoding => _inner.Encoding;
+
+        public override void Write(char value)
+        {
+            lock (_gate)
+            {
+                _inner.Write(value);
+                Append(value);
+            }
+        }
+
+        public override void Write(string? value)
+        {
+            if (value is null)
+            {
+                return;
+            }
+
+            lock (_gate)
+            {
+                _inner.Write(value);
+                foreach (var character in value)
+                {
+                    Append(character);
+                }
+            }
+        }
+
+        public override void WriteLine(string? value)
+        {
+            lock (_gate)
+            {
+                _inner.WriteLine(value);
+                if (!string.IsNullOrEmpty(value))
+                {
+                    _line.Append(value);
+                }
+
+                FlushLine();
+            }
+        }
+
+        private void Append(char value)
+        {
+            if (value == '\r')
+            {
+                return;
+            }
+
+            if (value == '\n')
+            {
+                FlushLine();
+                return;
+            }
+
+            _line.Append(value);
+        }
+
+        private void FlushLine()
+        {
+            _writeLine(_line.ToString());
+            _line.Clear();
+        }
+    }
+}

src/SharpEmu.GUI/GuiSettings.cs

@@ -48,6 +48,8 @@ public sealed class GuiSettings
     /// <summary>Publish launcher/game status to Discord Rich Presence.</summary>
     public bool DiscordRichPresence { get; set; } = true;
 
+    public bool CheckForUpdatesOnStartup { get; set; } = true;
+
     /// <summary>Names of SHARPEMU_* switches set to "1" in the emulator's environment at launch.</summary>
     public List<string> EnvironmentToggles { get; set; } = new();
 

src/SharpEmu.GUI/Languages/en.json

@@ -31,9 +31,11 @@
   "Options.Env.Desc": "Switches passed to the emulator as environment variables at launch.",
   "Options.Env.Bthid.Desc": "Report Bluetooth HID as unavailable for titles whose wheel/FFB middleware polls forever.\nLeave off normally. Some titles freeze when init fails.",
   "Options.Env.LoopGuard.Desc": "Do not force quit titles that repeat the same call for too long.\nTry this when a game exits on its own while loading.",
+  "Options.Env.WritableApp0.Desc": "Allow titles to create and write files inside their install folder.\nNeeded by unpackaged dumps that write their save or config data under /app0.",
   "Options.Env.VkValidation.Desc": "Enable Vulkan validation layers for GPU debugging.\nSlow. Requires the Vulkan SDK to be installed.",
   "Options.Env.DumpSpirv.Desc": "Dump AGC shaders and their SPIR-V translations to the shader-dumps folder.\nUse when reporting shader or rendering bugs.",
   "Options.Env.LogDirectMemory.Desc": "Log direct memory allocations and failures to the console.\nUse when a game aborts or exits during boot.",
+  "Options.Env.LogIo.Desc": "Log file open, read, and path-resolve activity to the console.\nUse when a game cannot find its data files during boot.",
   "Options.Env.LogNp.Desc": "Log NP (PlayStation Network) library calls to the console.",
   "Options.Section.Emulation": "EMULATION",
   "Options.Section.Logging": "LOGGING",
@@ -139,8 +141,25 @@
   "Options.About" : "About",
   "About.Github.Label": "GitHub",
   "About.Github.Desc": "Source code, issues and project development.",
+  "About.Github.LatestCommitLabel": "Latest Commit",
+  "About.Github.LatestCommitDescription": "Latest commit on the main branch",
   "About.Discord.Label": "Discord",
   "About.Discord.Desc": "Join the community, get support and follow development.",
   "About.GithubButton": "Contribute in GitHub!",
-  "About.DiscordButton": "Join our Discord!"
+  "About.DiscordButton": "Join our Discord!",
+
+  "Updater.Auto.Label": "Check for updates on startup",
+  "Updater.Auto.Desc": "Checks GitHub without delaying startup.",
+  "Updater.Label": "Updates",
+  "Updater.Check": "Check for updates",
+  "Updater.DownloadRestart": "Download and restart",
+  "Updater.Status.Ready": "Current build: {0}",
+  "Updater.Status.Checking": "Checking for updates…",
+  "Updater.Status.Current": "You are up to date ({0}).",
+  "Updater.Status.Available": "A new build is available: {0}",
+  "Updater.Status.Downloading": "Downloading update… {0}%",
+  "Updater.Status.Installing": "Installing update…",
+  "Updater.Status.Timeout": "Update check timed out after 10 seconds.",
+  "Updater.Status.Failed": "Could not check for updates.",
+  "Updater.Status.Unsupported": "Automatic updating requires a Windows, Linux or macOS x64 build."
 }

src/SharpEmu.GUI/Languages/es.json

@@ -131,6 +131,8 @@
   "About.Github.Label": "GitHub",
   "About.Github.Desc": "Código fuente, issues y desarrollo del proyecto.",
   "About.Discord.Label": "Discord",
+  "About.Github.LatestCommitLabel": "Último Commit",
+  "About.Github.LatestCommitDescription": "Último commit en la rama main",
   "About.Discord.Desc": "Únete a la comunidad, recibe soporte y sigue el desarrollo.",
   "About.GithubButton": "Contribuye en GitHub!",
   "About.DiscordButton": "Únete a nuestro Discord!"

src/SharpEmu.GUI/Languages/tr.json

@@ -125,5 +125,20 @@
   "Dialog.PsExecutables": "PS çalıştırılabilirleri",
   "Dialog.SaveLogFile": "Günlük dosyasının kaydedileceği yeri seçin",
   "Dialog.PlainTextFiles": "Düz Metin Dosyaları",
-  "Dialog.LogFiles": "Günlük Dosyaları"
+  "Dialog.LogFiles": "Günlük Dosyaları",
+
+  "Updater.Auto.Label": "Açılışta güncellemeleri denetle",
+  "Updater.Auto.Desc": "Açılışı geciktirmeden GitHub'ı denetler.",
+  "Updater.Label": "Güncellemeler",
+  "Updater.Check": "Güncellemeleri denetle",
+  "Updater.DownloadRestart": "İndir ve yeniden başlat",
+  "Updater.Status.Ready": "Mevcut build: {0}",
+  "Updater.Status.Checking": "Güncellemeler denetleniyor…",
+  "Updater.Status.Current": "Güncelsiniz ({0}).",
+  "Updater.Status.Available": "Yeni build mevcut: {0}",
+  "Updater.Status.Downloading": "Güncelleme indiriliyor… %{0}",
+  "Updater.Status.Installing": "Güncelleme kuruluyor…",
+  "Updater.Status.Timeout": "Güncelleme denetimi 10 saniye sonra zaman aşımına uğradı.",
+  "Updater.Status.Failed": "Güncellemeler denetlenemedi.",
+  "Updater.Status.Unsupported": "Otomatik güncelleme Windows, Linux veya macOS x64 build'i gerektirir."
 }

src/SharpEmu.GUI/MainWindow.axaml

@@ -5,6 +5,8 @@ SPDX-License-Identifier: GPL-2.0-or-later
 
 <Window xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:local="clr-namespace:SharpEmu.GUI"
+        xmlns:primitives="clr-namespace:Avalonia.Controls.Primitives;assembly=Avalonia.Controls"
         x:Class="SharpEmu.GUI.MainWindow"
         Title="SharpEmu"
         Width="1280" Height="820"
@@ -18,7 +20,7 @@ SPDX-License-Identifier: GPL-2.0-or-later
         Icon="avares://SharpEmu.GUI/Assets/SharpEmu.ico"
         KeyDown="OnKeyDown">
 
-  <Grid RowDefinitions="Auto,*,Auto">
+  <Grid x:Name="RootLayout" RowDefinitions="Auto,*,Auto">
 
     <!-- Selected-game backdrop: key art behind the main content, dimmed by
          a scrim so tiles and text stay readable. Fades on selection. -->
@@ -56,13 +58,19 @@ SPDX-License-Identifier: GPL-2.0-or-later
     </Grid>
 
     <!-- Main content -->
-    <Grid Grid.Row="1" Margin="32,24,32,20" RowDefinitions="Auto,*,Auto,Auto">
+    <Grid x:Name="MainContent" Grid.Row="1" Margin="32,24,32,20" RowDefinitions="Auto,*,Auto,Auto">
+
+      <!-- The game owns the full client area while running. Session controls
+           use a native popup so they can stay above this native child surface. -->
+      <Border x:Name="GameView" Grid.Row="0" Grid.RowSpan="4" IsVisible="False" Background="#000000" ClipToBounds="True">
+        <Grid x:Name="GameSurfaceContainer" />
+      </Border>
 
       <!-- Library / Options page switcher, with the library toolbar sharing
            the same row on the right. Plain buttons (not TabItem) so there is
            no underline; LB/RB hint chips flank the pair and the gamepad's
            shoulder buttons actually switch pages from anywhere. -->
-      <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Margin="0,0,0,20">
+      <Grid x:Name="ContentToolbar" Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Margin="0,0,0,20">
         <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="14" VerticalAlignment="Center">
           <Border Classes="padHint" VerticalAlignment="Center">
             <TextBlock Text="LB" FontSize="11" FontWeight="Bold" Foreground="{StaticResource MutedBrush}" />
@@ -315,6 +323,16 @@ SPDX-License-Identifier: GPL-2.0-or-later
                         <ToggleSwitch Grid.Column="1" x:Name="DiscordToggle" OnContent="On" OffContent="Off"
                                       VerticalAlignment="Center" />
                       </Grid>
+
+                      <Grid ColumnDefinitions="*,Auto">
+                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                          <TextBlock x:Name="AutoUpdateLabel" Text="Check for updates on startup" FontSize="13" />
+                          <TextBlock x:Name="AutoUpdateDesc" Text="Checks GitHub without delaying startup."
+                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
+                        </StackPanel>
+                        <ToggleSwitch Grid.Column="1" x:Name="AutoUpdateToggle" OnContent="On" OffContent="Off"
+                                      IsChecked="True" VerticalAlignment="Center" />
+                      </Grid>
                     </StackPanel>
                   </Border>
                   <Border Classes="card">
@@ -322,6 +340,40 @@ SPDX-License-Identifier: GPL-2.0-or-later
                       <TextBlock x:Name="AboutSectionTitle"
                                 Classes="sectionTitle"
                                 Text="ABOUT" />
+
+                      <!--Latest commit info-->
+                      <Grid ColumnDefinitions="*,Auto">
+                        <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="8" VerticalAlignment="Center">
+                          <Image Source="avares://SharpEmu.GUI/Assets/commit-icon.png"
+                                    Width="24" Height="24" VerticalAlignment="Center" />
+                          <StackPanel Spacing="2" VerticalAlignment="Center">
+                            <TextBlock x:Name="LatestCommitLabel" Text="Latest commit" FontSize="13"/>
+                            <TextBlock x:Name="LatestCommitDescription" Text="Latest commit on the main branch" FontSize="11" Foreground="{StaticResource MutedBrush}"/>
+                          </StackPanel>
+                        </StackPanel>
+
+                        <Button Grid.Column="1" x:Name="LatestCommitHashText" Classes="ghost"
+                          Content="Loading…" FontSize="12" FontFamily="Consolas,monospace"
+                          VerticalAlignment="Center" IsEnabled="False" />
+
+                      </Grid>
+
+                      <!--Update-->
+                      <Grid ColumnDefinitions="*,Auto">
+                        <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="8" VerticalAlignment="Center">
+                          <Image Source="avares://SharpEmu.GUI/Assets/update-icon.png"
+                                    Width="24"
+                                    Height="24"
+                                    VerticalAlignment="Center" />
+                          <StackPanel Spacing="2" VerticalAlignment="Center">
+                            <TextBlock x:Name="UpdateLabel" Text="Updates" FontSize="13" />
+                            <TextBlock x:Name="UpdateStatusText" Text="Current build: dev" FontSize="11"
+                                      Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
+                          </StackPanel>
+                        </StackPanel>
+                        <Button Grid.Column="1" x:Name="UpdateButton" Classes="ghost"
+                                Content="Check for updates" VerticalAlignment="Center" />
+                      </Grid>
                       
                       <!--Github-->
                       <Grid ColumnDefinitions="*,Auto">
@@ -420,6 +472,17 @@ SPDX-License-Identifier: GPL-2.0-or-later
                                       VerticalAlignment="Center" />
                       </Grid>
 
+                      <Grid ColumnDefinitions="*,Auto">
+                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                          <TextBlock Text="SHARPEMU_WRITABLE_APP0" FontSize="13" FontFamily="Consolas,monospace" />
+                          <TextBlock x:Name="EnvWritableApp0Desc"
+                                     Text="Allow titles to create and write files inside their install folder.&#10;Needed by unpackaged dumps that write their save or config data under /app0."
+                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
+                        </StackPanel>
+                        <ToggleSwitch Grid.Column="1" x:Name="EnvWritableApp0Toggle" OnContent="On" OffContent="Off"
+                                      VerticalAlignment="Center" />
+                      </Grid>
+
                       <Grid ColumnDefinitions="*,Auto">
                         <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
                           <TextBlock Text="SHARPEMU_VK_VALIDATION" FontSize="13" FontFamily="Consolas,monospace" />
@@ -453,6 +516,17 @@ SPDX-License-Identifier: GPL-2.0-or-later
                                       VerticalAlignment="Center" />
                       </Grid>
 
+                      <Grid ColumnDefinitions="*,Auto">
+                        <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
+                          <TextBlock Text="SHARPEMU_LOG_IO" FontSize="13" FontFamily="Consolas,monospace" />
+                          <TextBlock x:Name="EnvLogIoDesc"
+                                     Text="Log file open, read, and path-resolve activity to the console.&#10;Use when a game cannot find its data files during boot."
+                                     FontSize="11" Foreground="{StaticResource MutedBrush}" TextWrapping="Wrap" />
+                        </StackPanel>
+                        <ToggleSwitch Grid.Column="1" x:Name="EnvLogIoToggle" OnContent="On" OffContent="Off"
+                                      VerticalAlignment="Center" />
+                      </Grid>
+
                       <Grid ColumnDefinitions="*,Auto">
                         <StackPanel VerticalAlignment="Center" Spacing="2" Margin="0,0,16,0">
                           <TextBlock Text="SHARPEMU_LOG_NP" FontSize="13" FontFamily="Consolas,monospace" />
@@ -502,7 +576,7 @@ SPDX-License-Identifier: GPL-2.0-or-later
       </Border>
 
       <!-- Launch bar; capped so it does not sprawl on a maximized window. -->
-      <Border Grid.Row="3" Classes="card" Margin="0,12,0,0" Padding="14" MaxWidth="1280">
+      <Border Grid.Row="3" x:Name="LaunchBar" Classes="card" Margin="0,12,0,0" Padding="14" MaxWidth="1280">
         <StackPanel Spacing="14">
           <Grid ColumnDefinitions="Auto,*,Auto">
 
@@ -567,6 +641,66 @@ SPDX-License-Identifier: GPL-2.0-or-later
       </Border>
     </Grid>
 
+    <!-- Avalonia's regular overlay layer cannot appear over a native child
+         HWND/X11/Metal surface. Keep the running-session controls in a native
+         popup so the game reaches the bottom status bar without losing Stop. -->
+    <primitives:Popup x:Name="SessionBarPopup"
+                      IsOpen="False"
+                      PlacementTarget="{Binding #GameView}"
+                      Placement="Bottom"
+                      VerticalOffset="-66"
+                      Topmost="True"
+                      ShouldUseOverlayLayer="False"
+                      TakesFocusFromNativeControl="False"
+                      IsLightDismissEnabled="False">
+      <Border Classes="card" Width="598" Height="58" CornerRadius="16" Padding="14,8">
+        <Grid ColumnDefinitions="*,Auto">
+          <StackPanel Spacing="3" VerticalAlignment="Center">
+            <StackPanel Orientation="Horizontal" Spacing="8">
+              <TextBlock x:Name="SessionGameTitle" Text="GAME RUNNING" FontSize="13" FontWeight="SemiBold"
+                         MaxWidth="240" TextTrimming="CharacterEllipsis" VerticalAlignment="Center" />
+              <Border Classes="badge running" VerticalAlignment="Center">
+                <TextBlock Text="RUNNING" FontSize="9" FontWeight="Bold" LetterSpacing="1"
+                           Foreground="{StaticResource SuccessBrush}" />
+              </Border>
+            </StackPanel>
+            <StackPanel Orientation="Horizontal" Spacing="7">
+              <Border x:Name="SessionF11Badge" Classes="badge key" VerticalAlignment="Center">
+                <TextBlock Text="F11" FontSize="9" FontWeight="Bold"
+                           Foreground="{StaticResource InfoBrush}" />
+              </Border>
+              <TextBlock x:Name="SessionHintText" Text="Fullscreen" FontSize="11"
+                         Foreground="{StaticResource MutedBrush}" VerticalAlignment="Center" />
+            </StackPanel>
+          </StackPanel>
+          <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8" VerticalAlignment="Center">
+            <Button x:Name="SessionConsoleButton" Classes="ghost" Content="≡ Console" />
+            <Button x:Name="SessionStopButton" Classes="danger" Content="■  Stop" IsEnabled="False" />
+          </StackPanel>
+        </Grid>
+      </Border>
+    </primitives:Popup>
+
+    <!-- This is a native popup rather than an Avalonia overlay because the
+         emulated Vulkan surface is a native child window. -->
+    <primitives:Popup x:Name="SessionLoadingPopup"
+                      IsOpen="False"
+                      PlacementTarget="{Binding #GameView}"
+                      Placement="Center"
+                      Topmost="True"
+                      ShouldUseOverlayLayer="False"
+                      TakesFocusFromNativeControl="False"
+                      IsLightDismissEnabled="False">
+      <Border Classes="card" Width="380" CornerRadius="18" Padding="22,18">
+        <StackPanel Spacing="12">
+          <TextBlock x:Name="SessionLoadingTitle" Text="Loading game" FontSize="16" FontWeight="SemiBold" />
+          <TextBlock x:Name="SessionLoadingDetail" Text="Preparing the emulation session..." FontSize="12"
+                     Foreground="{StaticResource MutedBrush}" TextTrimming="CharacterEllipsis" />
+          <ProgressBar IsIndeterminate="True" Height="5" />
+        </StackPanel>
+      </Border>
+    </primitives:Popup>
+
     <!-- Status bar -->
     <Grid x:Name="StatusBar" Grid.Row="2" Height="32" Background="{StaticResource ChromeBrush}"
           ColumnDefinitions="*,Auto">

src/SharpEmu.GUI/SharpEmu.GUI.csproj

@@ -17,6 +17,10 @@ SPDX-License-Identifier: GPL-2.0-or-later
   <!-- Dependency-free; provides the BuildInfo provenance shown in the
        title bar. -->
   <ItemGroup>
+    <!-- The GUI owns the native presentation control while each game runs in
+         an isolated emulator process. -->
+    <ProjectReference Include="..\SharpEmu.Core\SharpEmu.Core.csproj" />
+    <ProjectReference Include="..\SharpEmu.Libs\SharpEmu.Libs.csproj" />
     <ProjectReference Include="..\SharpEmu.Logging\SharpEmu.Logging.csproj" />
   </ItemGroup>
 
@@ -32,6 +36,8 @@ SPDX-License-Identifier: GPL-2.0-or-later
     <AvaloniaResource Include="..\..\assets\images\SharpEmu.ico" Link="Assets/SharpEmu.ico" />
     <AvaloniaResource Include="..\..\assets\images\github.png" Link="Assets/github.png" />
     <AvaloniaResource Include="..\..\assets\images\discord.png" Link="Assets/discord.png" />
+    <AvaloniaResource Include="..\..\assets\images\update-icon.png" Link="Assets/update-icon.png" />
+    <AvaloniaResource Include="..\..\assets\images\commit-icon.png" Link="Assets/commit-icon.png" />
   </ItemGroup>
 
   <ItemGroup>
@@ -39,18 +45,4 @@ SPDX-License-Identifier: GPL-2.0-or-later
       <LogicalName>Languages.%(Filename)%(Extension)</LogicalName>
     </EmbeddedResource>
   </ItemGroup>
-
-
-
-  <!-- The controller readers (DualSense raw HID + Xbox XInput) are shared
-       with the emulator's host input backend. They are dependency-free, so
-       they are compiled in directly rather than pulling a reference to all
-       of SharpEmu.HLE into the launcher. -->
-  <ItemGroup>
-    <Compile Include="..\SharpEmu.HLE\Host\HostGamepadState.cs" Link="Input/HostGamepadState.cs" />
-    <Compile Include="..\SharpEmu.HLE\Host\Windows\WindowsHidNative.cs" Link="Input/WindowsHidNative.cs" />
-    <Compile Include="..\SharpEmu.HLE\Host\Windows\WindowsDualSenseReader.cs" Link="Input/WindowsDualSenseReader.cs" />
-    <Compile Include="..\SharpEmu.HLE\Host\Windows\WindowsXInputReader.cs" Link="Input/WindowsXInputReader.cs" />
-  </ItemGroup>
-
 </Project>

src/SharpEmu.GUI/Updater.cs

@@ -0,0 +1,253 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Diagnostics;
+using System.Formats.Tar;
+using System.IO.Compression;
+using System.Net.Http.Headers;
+using System.Runtime.InteropServices;
+using System.Text.Json;
+
+namespace SharpEmu.GUI;
+
+/// <summary>Self-contained Windows updater; the emulator layers do not depend on it.</summary>
+public static class Updater
+{
+    private const string ApplyArgument = "--sharpemu-apply-update";
+    private const string LatestReleaseUrl = "https://api.github.com/repos/sharpemu/sharpemu/releases/latest";
+    private static readonly TimeSpan CheckTimeout = TimeSpan.FromSeconds(10);
+    private static readonly HttpClient Http = CreateHttpClient();
+
+    public sealed record UpdateInfo(string Sha, string Name, string DownloadUrl, long Size);
+
+    public static async Task<UpdateInfo?> CheckAsync(string? currentSha, CancellationToken cancellationToken = default)
+    {
+        var platform = CurrentPlatform();
+        using var timeout = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
+        timeout.CancelAfter(CheckTimeout);
+
+        using var response = await Http.GetAsync(LatestReleaseUrl, timeout.Token);
+        response.EnsureSuccessStatusCode();
+        return ParseRelease(
+            await response.Content.ReadAsStringAsync(timeout.Token),
+            currentSha,
+            platform.Rid,
+            platform.Extension);
+    }
+
+    public static async Task DownloadAndRestartAsync(
+        UpdateInfo update,
+        IProgress<int>? progress = null,
+        CancellationToken cancellationToken = default)
+    {
+        var root = Path.Combine(Path.GetTempPath(), "SharpEmu.Update");
+        var payload = Path.Combine(root, "payload");
+        if (Directory.Exists(root))
+        {
+            Directory.Delete(root, recursive: true);
+        }
+
+        Directory.CreateDirectory(root);
+        var archive = Path.Combine(root, update.Name);
+        using (var response = await Http.GetAsync(update.DownloadUrl, HttpCompletionOption.ResponseHeadersRead, cancellationToken))
+        {
+            response.EnsureSuccessStatusCode();
+            await using var input = await response.Content.ReadAsStreamAsync(cancellationToken);
+            await using var output = File.Create(archive);
+            var buffer = new byte[81920];
+            long written = 0;
+            int read;
+            while ((read = await input.ReadAsync(buffer, cancellationToken)) > 0)
+            {
+                await output.WriteAsync(buffer.AsMemory(0, read), cancellationToken);
+                written += read;
+                progress?.Report(update.Size == 0 ? 0 : (int)(written * 100 / update.Size));
+            }
+
+            if (written != update.Size)
+            {
+                throw new InvalidDataException($"Downloaded {written} bytes; expected {update.Size}.");
+            }
+        }
+
+        var platform = CurrentPlatform();
+        var stagedExe = ExtractArchive(archive, payload, platform.Extension, platform.ExecutableName);
+
+        var start = new ProcessStartInfo(stagedExe)
+        {
+            UseShellExecute = false,
+            WorkingDirectory = payload,
+        };
+        start.ArgumentList.Add(ApplyArgument);
+        start.ArgumentList.Add(Environment.ProcessId.ToString());
+        start.ArgumentList.Add(AppContext.BaseDirectory);
+        using var helper = Process.Start(start)
+            ?? throw new InvalidOperationException("The update installer could not be started.");
+    }
+
+    /// <summary>Runs from the downloaded executable after the old GUI exits.</summary>
+    public static bool TryApply(string[] args, out int exitCode)
+    {
+        exitCode = 0;
+        if (args.Length != 3 || args[0] != ApplyArgument)
+        {
+            return false;
+        }
+
+        try
+        {
+            if (int.TryParse(args[1], out var oldPid))
+            {
+                try
+                {
+                    if (!Process.GetProcessById(oldPid).WaitForExit(30_000))
+                    {
+                        throw new TimeoutException("SharpEmu did not close within 30 seconds.");
+                    }
+                }
+                catch (ArgumentException)
+                {
+                    // The old process has already exited.
+                }
+            }
+
+            var source = AppContext.BaseDirectory;
+            var target = Path.GetFullPath(args[2]);
+            foreach (var file in Directory.EnumerateFiles(source, "*", SearchOption.AllDirectories))
+            {
+                var relative = Path.GetRelativePath(source, file);
+                if (relative.Equals("gui-settings.json", StringComparison.OrdinalIgnoreCase) ||
+                    relative.StartsWith("user" + Path.DirectorySeparatorChar, StringComparison.OrdinalIgnoreCase) ||
+                    relative.StartsWith("logs" + Path.DirectorySeparatorChar, StringComparison.OrdinalIgnoreCase) ||
+                    relative.StartsWith("Languages" + Path.DirectorySeparatorChar, StringComparison.OrdinalIgnoreCase))
+                {
+                    continue;
+                }
+
+                var destination = Path.Combine(target, relative);
+                Directory.CreateDirectory(Path.GetDirectoryName(destination)!);
+                File.Copy(file, destination, overwrite: true);
+                if (!OperatingSystem.IsWindows())
+                {
+                    File.SetUnixFileMode(destination, File.GetUnixFileMode(file));
+                }
+            }
+
+            using var restarted = Process.Start(new ProcessStartInfo(
+                Path.Combine(target, CurrentPlatform().ExecutableName))
+            {
+                UseShellExecute = false,
+                WorkingDirectory = target,
+            }) ?? throw new InvalidOperationException("The updated SharpEmu could not be started.");
+        }
+        catch (Exception ex)
+        {
+            exitCode = 1;
+            try
+            {
+                File.WriteAllText(Path.Combine(args[2], "update-error.log"), ex.ToString());
+            }
+            catch
+            {
+                // Best-effort diagnostics only.
+            }
+        }
+
+        return true;
+    }
+
+    private static UpdateInfo? ParseRelease(
+        string json,
+        string? currentSha,
+        string rid,
+        string extension)
+    {
+        using var document = JsonDocument.Parse(json);
+        var candidates = new List<(DateTimeOffset Created, UpdateInfo Update)>();
+        foreach (var asset in document.RootElement.GetProperty("assets").EnumerateArray())
+        {
+            var name = asset.GetProperty("name").GetString() ?? "";
+            var marker = $"-{rid}-";
+            var markerIndex = name.LastIndexOf(marker, StringComparison.OrdinalIgnoreCase);
+            if (!name.EndsWith(extension, StringComparison.OrdinalIgnoreCase) ||
+                markerIndex < 0)
+            {
+                continue;
+            }
+
+            var sha = name[(markerIndex + marker.Length)..^extension.Length];
+            if (sha.Length < 7 || !sha.All(Uri.IsHexDigit))
+            {
+                continue;
+            }
+
+            candidates.Add((
+                asset.GetProperty("created_at").GetDateTimeOffset(),
+                new UpdateInfo(
+                    sha,
+                    name,
+                    asset.GetProperty("browser_download_url").GetString()!,
+                    asset.GetProperty("size").GetInt64())));
+        }
+
+        var latest = candidates.OrderByDescending(candidate => candidate.Created).FirstOrDefault().Update;
+        return latest is null || string.Equals(latest.Sha, currentSha, StringComparison.OrdinalIgnoreCase)
+            ? null
+            : latest;
+    }
+
+    private static string ExtractArchive(
+        string archive,
+        string payload,
+        string extension,
+        string executableName)
+    {
+        if (extension == ".zip")
+        {
+            ZipFile.ExtractToDirectory(archive, payload);
+        }
+        else
+        {
+            Directory.CreateDirectory(payload);
+            using var compressed = File.OpenRead(archive);
+            using var gzip = new GZipStream(compressed, CompressionMode.Decompress);
+            TarFile.ExtractToDirectory(gzip, payload, overwriteFiles: false);
+        }
+
+        var executable = Path.Combine(payload, executableName);
+        if (!File.Exists(executable))
+        {
+            throw new InvalidDataException($"The update archive does not contain {executableName}.");
+        }
+
+        if (!OperatingSystem.IsWindows())
+        {
+            File.SetUnixFileMode(executable, File.GetUnixFileMode(executable) | UnixFileMode.UserExecute);
+        }
+
+        return executable;
+    }
+
+    private static HttpClient CreateHttpClient()
+    {
+        var client = new HttpClient { Timeout = Timeout.InfiniteTimeSpan };
+        client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("SharpEmu", "0.0.1"));
+        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/vnd.github+json"));
+        return client;
+    }
+
+    private static PlatformInfo CurrentPlatform()
+    {
+        if (RuntimeInformation.ProcessArchitecture != Architecture.X64)
+        {
+            throw new PlatformNotSupportedException("SharpEmu releases require an x64 process.");
+        }
+
+        if (OperatingSystem.IsWindows()) return new("win-x64", ".zip", "SharpEmu.exe");
+        if (OperatingSystem.IsLinux()) return new("linux-x64", ".tar.gz", "SharpEmu");
+        if (OperatingSystem.IsMacOS()) return new("osx-x64", ".tar.gz", "SharpEmu");
+        throw new PlatformNotSupportedException();
+    }
+
+    private sealed record PlatformInfo(string Rid, string Extension, string ExecutableName);
+}

src/SharpEmu.HLE/CpuContext.cs

@@ -26,6 +26,12 @@ public sealed class CpuContext(ICpuMemory memory, Generation generation)
 
     public ulong GsBase { get; set; }
 
+    /// <summary>x87 control word observed at the current guest boundary.</summary>
+    public ushort FpuControlWord { get; set; } = 0x037F;
+
+    /// <summary>MXCSR observed at the current guest boundary.</summary>
+    public uint Mxcsr { get; set; } = 0x1F80;
+
     public ulong this[CpuRegister register]
     {
         get => _registers[(int)register];

src/SharpEmu.HLE/GuestImageWriteTracker.cs

@@ -0,0 +1,613 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Globalization;
+using System.Runtime.InteropServices;
+
+namespace SharpEmu.HLE;
+
+/// <summary>
+/// Detects guest CPU writes into memory that backs a host GPU image. On PS5
+/// render targets alias unified memory, so games freely mix CPU writes and GPU
+/// draws on the same surface (Chowdren titles memset their fog layers every
+/// frame). Host GPU images are separate storage, so the video backend needs to
+/// know when the guest CPU rewrote a surface to re-upload it. Ranges are
+/// write-protected; the first write faults, the fault handler restores write
+/// access and marks the range dirty, and the video backend consumes the dirty
+/// flag once per flip and re-arms protection after re-uploading.
+/// </summary>
+public static unsafe class GuestImageWriteTracker
+{
+    private const int ProtRead = 0x1;
+    private const int ProtWrite = 0x2;
+    private const int ClockMonotonicRaw = 4;
+
+    private sealed class TrackedRange
+    {
+        public ulong Address;
+        public ulong ByteCount;
+        public ulong Start;
+        public ulong End;
+        public int Dirty;
+        public int Armed;
+        public int FirstCpuWriteSeen;
+        public int PendingFirstCpuWrite;
+        public bool TraceLifetime;
+        public long SourceSequence;
+        public long FirstCpuWriteTraceSequence;
+        public long FirstCpuWriteTimestampNanoseconds;
+        public ulong FirstCpuWriteAddress;
+        public ulong FirstCpuWritePage;
+        public string Source = "unspecified";
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    private struct Timespec
+    {
+        public long Seconds;
+        public long Nanoseconds;
+    }
+
+    private static readonly object _gate = new();
+    private static readonly Dictionary<ulong, TrackedRange> _rangesByAddress = new();
+
+    // Snapshot array read lock-free from the signal handler; rebuilt on every
+    // mutation under the gate. Signal handlers must not take managed locks.
+    private static TrackedRange[] _rangeSnapshot = [];
+
+    private static readonly bool _enabled = !OperatingSystem.IsWindows() &&
+        Environment.GetEnvironmentVariable("SHARPEMU_GUEST_IMAGE_CPU_SYNC") != "0";
+    private static readonly (bool Wildcard, ulong[] Addresses) _lifetimeTraceFilter =
+        ParseAddressList(Environment.GetEnvironmentVariable("SHARPEMU_TRACE_GUEST_IMAGE_ADDRS"));
+    private static readonly (bool Wildcard, string[] Sources) _lifetimeSourceTraceFilter =
+        ParseSourceList(Environment.GetEnvironmentVariable("SHARPEMU_TRACE_GUEST_MEMORY_LIFETIME"));
+    private static readonly bool _lifetimeTraceEnabled =
+        _lifetimeTraceFilter.Wildcard ||
+        _lifetimeTraceFilter.Addresses.Length != 0 ||
+        _lifetimeSourceTraceFilter.Wildcard ||
+        _lifetimeSourceTraceFilter.Sources.Length != 0;
+    private static readonly long _lifetimeTraceEpochNanoseconds =
+        _enabled && _lifetimeTraceEnabled ? GetMonotonicNanoseconds() : 0;
+    private static long _lifetimeTraceSequence;
+
+    [DllImport("libc", EntryPoint = "mprotect", SetLastError = true)]
+    private static extern int Mprotect(nint address, nuint length, int protection);
+
+    [DllImport("libc", EntryPoint = "clock_gettime", SetLastError = false)]
+    private static extern int ClockGetTime(int clockId, Timespec* time);
+
+    public static bool Enabled => _enabled;
+
+    /// <summary>
+    /// Exercises the fault-handling path once outside signal context so every
+    /// branch is JIT-compiled (and, under Rosetta 2, translated) before a real
+    /// fault arrives — a cold signal path is silently never entered there.
+    /// </summary>
+    public static void WarmUp()
+    {
+        if (!_enabled)
+        {
+            return;
+        }
+
+        var scratch = NativeMemory.AllocZeroed(4096);
+        try
+        {
+            // Warm the timestamp P/Invoke used by the signal-safe scalar
+            // capture path before a real protected-page write reaches it.
+            _ = GetMonotonicNanoseconds();
+            var address = (ulong)scratch;
+            Track(address, 4096);
+            _ = TryHandleWriteFault(address);
+            _ = ConsumeDirty(address);
+            Untrack(address);
+        }
+        finally
+        {
+            NativeMemory.Free(scratch);
+        }
+    }
+
+    /// <summary>Registers a range and arms write protection on it.</summary>
+    public static void Track(
+        ulong address,
+        ulong byteCount,
+        long sourceSequence = 0,
+        string source = "unspecified")
+    {
+        if (!_enabled || address == 0 || byteCount == 0)
+        {
+            return;
+        }
+
+        var (start, length) = PageAlign(address, byteCount);
+        lock (_gate)
+        {
+            _rangesByAddress.TryGetValue(address, out var range);
+            if (range is not null &&
+                (range.Start != start ||
+                 range.End != start + length ||
+                 range.ByteCount != byteCount))
+            {
+                // Never resize an object that is still reachable from the
+                // signal handler's lock-free snapshot. Retire it and publish
+                // a fresh immutable range.
+                DisarmLocked(range, "replace-range");
+                _rangesByAddress.Remove(address);
+                range = null;
+            }
+
+            if (range is null)
+            {
+                range = new TrackedRange
+                {
+                    Address = address,
+                    ByteCount = byteCount,
+                    Start = start,
+                    End = start + length,
+                    TraceLifetime =
+                        ShouldTraceRange(start, start + length) || ShouldTraceSource(source),
+                    SourceSequence = sourceSequence,
+                    Source = source,
+                };
+                _rangesByAddress[address] = range;
+                RebuildSnapshotLocked();
+            }
+            else
+            {
+                FlushPendingFirstCpuWrite(range);
+            }
+
+            range.SourceSequence = sourceSequence;
+            range.Source = source;
+            range.TraceLifetime =
+                ShouldTraceRange(range.Start, range.End) || ShouldTraceSource(source);
+            ArmLocked(range, "arm");
+        }
+    }
+
+    public static void Untrack(ulong address)
+    {
+        if (!_enabled)
+        {
+            return;
+        }
+
+        lock (_gate)
+        {
+            if (_rangesByAddress.TryGetValue(address, out var range))
+            {
+                DisarmLocked(range, "untrack");
+                _rangesByAddress.Remove(address);
+                RebuildSnapshotLocked();
+            }
+        }
+    }
+
+    /// <summary>
+    /// Returns true when the guest CPU wrote the range since the last call,
+    /// clearing the flag. The caller re-arms via <see cref="Rearm"/> after it
+    /// finished reading the guest bytes.
+    /// </summary>
+    public static bool ConsumeDirty(ulong address)
+    {
+        if (!_enabled)
+        {
+            return false;
+        }
+
+        lock (_gate)
+        {
+            if (!_rangesByAddress.TryGetValue(address, out var range))
+            {
+                return false;
+            }
+
+            FlushPendingFirstCpuWrite(range);
+            return Interlocked.Exchange(ref range.Dirty, 0) != 0;
+        }
+    }
+
+    /// <summary>
+    /// Non-consuming variant of <see cref="ConsumeDirty"/>: reports whether
+    /// the range has been written since it was last re-armed, leaving the
+    /// flag for the owner that evicts and re-uploads.
+    /// </summary>
+    public static bool PeekDirty(ulong address)
+    {
+        if (!_enabled)
+        {
+            return false;
+        }
+
+        lock (_gate)
+        {
+            if (!_rangesByAddress.TryGetValue(address, out var range))
+            {
+                return false;
+            }
+
+            FlushPendingFirstCpuWrite(range);
+            return Volatile.Read(ref range.Dirty) != 0;
+        }
+    }
+
+    public static void Rearm(ulong address)
+    {
+        if (!_enabled)
+        {
+            return;
+        }
+
+        lock (_gate)
+        {
+            if (_rangesByAddress.TryGetValue(address, out var range))
+            {
+                ArmLocked(range, "rearm");
+            }
+        }
+    }
+
+    /// <summary>
+    /// Prepares pages touched by a managed HLE memory write. Native guest
+    /// stores fault and enter <see cref="TryHandleWriteFault"/> through the
+    /// POSIX signal bridge, but a managed Buffer.MemoryCopy into a protected
+    /// page is surfaced by the runtime as a fatal AccessViolation instead of
+    /// a resumable guest fault. Visit every page in the write span up front so
+    /// all overlapping texture owners are dirtied and made writable.
+    /// </summary>
+    public static void NotifyManagedWrite(ulong address, ulong byteCount)
+    {
+        if (!_enabled || address == 0 || byteCount == 0)
+        {
+            return;
+        }
+
+        var end = address > ulong.MaxValue - byteCount
+            ? ulong.MaxValue
+            : address + byteCount;
+        var candidate = address;
+        while (candidate < end)
+        {
+            _ = TryHandleWriteFault(candidate);
+            var nextPage = (candidate & ~0xFFFUL) + 0x1000UL;
+            if (nextPage <= candidate)
+            {
+                break;
+            }
+            candidate = nextPage;
+        }
+    }
+
+    /// <summary>
+    /// Flushes scalar first-write records captured by the POSIX signal handler.
+    /// Call only from ordinary managed execution, never from signal context.
+    /// </summary>
+    public static void FlushPendingDiagnostics()
+    {
+        if (!_enabled || !_lifetimeTraceEnabled)
+        {
+            return;
+        }
+
+        lock (_gate)
+        {
+            foreach (var range in _rangesByAddress.Values)
+            {
+                FlushPendingFirstCpuWrite(range);
+            }
+        }
+    }
+
+    /// <summary>
+    /// Signal-handler entry: if the fault address lies in a tracked, armed
+    /// range, restore write access, mark the range dirty, and return true so
+    /// the faulting write can be retried. Must not allocate or lock.
+    /// </summary>
+    public static bool TryHandleWriteFault(ulong faultAddress)
+    {
+        if (!_enabled || faultAddress == 0)
+        {
+            return false;
+        }
+
+        var ranges = Volatile.Read(ref _rangeSnapshot);
+        var writableStart = ulong.MaxValue;
+        var writableEnd = 0UL;
+        for (var index = 0; index < ranges.Length; index++)
+        {
+            var range = ranges[index];
+            if (faultAddress < range.Start || faultAddress >= range.End)
+            {
+                continue;
+            }
+
+            writableStart = Math.Min(writableStart, range.Start);
+            writableEnd = Math.Max(writableEnd, range.End);
+        }
+
+        if (writableStart == ulong.MaxValue)
+        {
+            return false;
+        }
+
+        // Ranges are page-aligned and may overlap (font atlases and other
+        // suballocations commonly share pages). Unprotecting one range also
+        // makes every overlapping tracked page writable. Expand to the full
+        // transitive overlap and dirty/disarm every owner, otherwise only the
+        // first dictionary entry observes the write and the others retain a
+        // stale cached texture indefinitely.
+        var expanded = true;
+        while (expanded)
+        {
+            expanded = false;
+            for (var index = 0; index < ranges.Length; index++)
+            {
+                var range = ranges[index];
+                if (range.Start >= writableEnd || range.End <= writableStart)
+                {
+                    continue;
+                }
+
+                var start = Math.Min(writableStart, range.Start);
+                var end = Math.Max(writableEnd, range.End);
+                if (start != writableStart || end != writableEnd)
+                {
+                    writableStart = start;
+                    writableEnd = end;
+                    expanded = true;
+                }
+            }
+        }
+
+        var needsUnprotect = false;
+        for (var index = 0; index < ranges.Length; index++)
+        {
+            var range = ranges[index];
+            if (range.Start < writableEnd && range.End > writableStart &&
+                Volatile.Read(ref range.Armed) != 0)
+            {
+                needsUnprotect = true;
+                break;
+            }
+        }
+
+        if (needsUnprotect &&
+            Mprotect(
+                (nint)writableStart,
+                (nuint)(writableEnd - writableStart),
+                ProtRead | ProtWrite) != 0)
+        {
+            return false;
+        }
+
+        for (var index = 0; index < ranges.Length; index++)
+        {
+            var range = ranges[index];
+            if (range.Start >= writableEnd || range.End <= writableStart)
+            {
+                continue;
+            }
+
+            var wasArmed = Interlocked.Exchange(ref range.Armed, 0) != 0;
+            if (wasArmed &&
+                range.TraceLifetime &&
+                Interlocked.CompareExchange(ref range.FirstCpuWriteSeen, 1, 0) == 0)
+            {
+                // Signal context: capture preallocated scalar fields only.
+                // Formatting and I/O are deferred to a locked safe path.
+                range.FirstCpuWriteTraceSequence =
+                    Interlocked.Increment(ref _lifetimeTraceSequence);
+                range.FirstCpuWriteTimestampNanoseconds = GetMonotonicNanoseconds();
+                range.FirstCpuWriteAddress = faultAddress;
+                range.FirstCpuWritePage = faultAddress & ~0xFFFUL;
+                Volatile.Write(ref range.PendingFirstCpuWrite, 1);
+                Volatile.Write(ref range.FirstCpuWriteSeen, 2);
+            }
+
+            Volatile.Write(ref range.Dirty, 1);
+        }
+
+        return true;
+    }
+
+    private static void ArmLocked(TrackedRange range, string operation)
+    {
+        FlushPendingFirstCpuWrite(range);
+        if (Interlocked.Exchange(ref range.Armed, 1) == 1)
+        {
+            return;
+        }
+
+        // A new publication/rearm starts a new first-write lifetime.
+        Volatile.Write(ref range.FirstCpuWriteSeen, 0);
+        var failed = Mprotect(
+            (nint)range.Start,
+            (nuint)(range.End - range.Start),
+            ProtRead) != 0;
+        if (failed)
+        {
+            Volatile.Write(ref range.Armed, 0);
+        }
+
+        if (range.TraceLifetime)
+        {
+            TraceLifetime(
+                range,
+                failed ? $"{operation}-failed-errno-{Marshal.GetLastPInvokeError()}" : operation);
+        }
+    }
+
+    private static void DisarmLocked(TrackedRange range, string operation)
+    {
+        FlushPendingFirstCpuWrite(range);
+        var wasArmed = Interlocked.Exchange(ref range.Armed, 0) == 1;
+        if (wasArmed)
+        {
+            _ = Mprotect(
+                (nint)range.Start,
+                (nuint)(range.End - range.Start),
+                ProtRead | ProtWrite);
+        }
+
+        if (range.TraceLifetime)
+        {
+            TraceLifetime(range, wasArmed ? operation : $"{operation}-already-disarmed");
+        }
+    }
+
+    private static void RebuildSnapshotLocked()
+    {
+        _rangeSnapshot = _rangesByAddress.Values.ToArray();
+    }
+
+    private static (ulong Start, ulong Length) PageAlign(ulong address, ulong byteCount)
+    {
+        const ulong pageMask = 0xFFFUL;
+        var start = address & ~pageMask;
+        var end = (address + byteCount + pageMask) & ~pageMask;
+        return (start, end - start);
+    }
+
+    private static bool ShouldTraceRange(ulong start, ulong end)
+    {
+        if (_lifetimeTraceFilter.Wildcard)
+        {
+            return true;
+        }
+
+        var addresses = _lifetimeTraceFilter.Addresses;
+        for (var index = 0; index < addresses.Length; index++)
+        {
+            if (addresses[index] >= start && addresses[index] < end)
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private static (bool Wildcard, ulong[] Addresses) ParseAddressList(string? addresses)
+    {
+        if (string.IsNullOrWhiteSpace(addresses))
+        {
+            return (false, []);
+        }
+
+        var parsedAddresses = new List<ulong>();
+        foreach (var token in addresses.Split(
+                     [',', ';', ' ', '\t'],
+                     StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
+        {
+            if (token == "*")
+            {
+                return (true, []);
+            }
+
+            var span = token.AsSpan();
+            if (span.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
+            {
+                span = span[2..];
+            }
+
+            if (ulong.TryParse(span, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var parsed))
+            {
+                parsedAddresses.Add(parsed);
+            }
+        }
+
+        return (false, parsedAddresses.ToArray());
+    }
+
+    private static bool ShouldTraceSource(string source)
+    {
+        if (_lifetimeSourceTraceFilter.Wildcard)
+        {
+            return true;
+        }
+
+        return Array.IndexOf(_lifetimeSourceTraceFilter.Sources, source) >= 0;
+    }
+
+    private static (bool Wildcard, string[] Sources) ParseSourceList(string? sources)
+    {
+        if (string.IsNullOrWhiteSpace(sources))
+        {
+            return (false, []);
+        }
+
+        var parsedSources = new List<string>();
+        foreach (var token in sources.Split(
+                     [',', ';'],
+                     StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
+        {
+            if (token == "*")
+            {
+                return (true, []);
+            }
+
+            parsedSources.Add(token);
+        }
+
+        return (false, parsedSources.ToArray());
+    }
+
+    private static void FlushPendingFirstCpuWrite(TrackedRange range)
+    {
+        var spin = new SpinWait();
+        while (Volatile.Read(ref range.FirstCpuWriteSeen) == 1)
+        {
+            spin.SpinOnce();
+        }
+
+        if (!range.TraceLifetime || Interlocked.Exchange(ref range.PendingFirstCpuWrite, 0) == 0)
+        {
+            return;
+        }
+
+        TraceLifetime(
+            range,
+            "first-cpu-write-disarm",
+            range.FirstCpuWriteAddress,
+            range.FirstCpuWritePage,
+            range.FirstCpuWriteTraceSequence,
+            range.FirstCpuWriteTimestampNanoseconds);
+    }
+
+    private static void TraceLifetime(
+        TrackedRange range,
+        string operation,
+        ulong faultAddress = 0,
+        ulong faultPage = 0,
+        long traceSequence = 0,
+        long timestampNanoseconds = 0)
+    {
+        if (traceSequence == 0)
+        {
+            traceSequence = Interlocked.Increment(ref _lifetimeTraceSequence);
+        }
+
+        if (timestampNanoseconds == 0)
+        {
+            timestampNanoseconds = GetMonotonicNanoseconds();
+        }
+
+        var elapsedMilliseconds =
+            (timestampNanoseconds - _lifetimeTraceEpochNanoseconds) / 1_000_000.0;
+        Console.Error.WriteLine(
+            $"[WT][LIFETIME] seq={traceSequence} t_ms={elapsedMilliseconds:F3} " +
+            $"event={operation} source_seq={range.SourceSequence} source='{range.Source}' " +
+            $"requested=0x{range.Address:X16}+0x{range.ByteCount:X} " +
+            $"range=0x{range.Start:X16}..0x{range.End:X16} " +
+            $"fault=0x{faultAddress:X16} page=0x{faultPage:X16}");
+    }
+
+    private static long GetMonotonicNanoseconds()
+    {
+        Timespec time;
+        return ClockGetTime(ClockMonotonicRaw, &time) == 0
+            ? unchecked((time.Seconds * 1_000_000_000L) + time.Nanoseconds)
+            : 0;
+    }
+}

src/SharpEmu.HLE/GuestThreadExecution.cs

@@ -41,6 +41,14 @@ public interface IGuestThreadScheduler
 {
     bool SupportsGuestContextTransfer { get; }
 
+    /// <summary>
+    /// Associates a pthread identity created on the primary guest executor
+    /// with its live CPU context. Primary execution does not pass through
+    /// TryStartThread, but kernel exception delivery must still be able to
+    /// target it.
+    /// </summary>
+    void RegisterGuestThreadContext(ulong threadHandle, CpuContext context);
+
     bool TryStartThread(CpuContext creatorContext, GuestThreadStartRequest request, out string? error);
 
     bool TryJoinThread(
@@ -53,6 +61,19 @@ public interface IGuestThreadScheduler
 
     int WakeBlockedThreads(string wakeKey, int maxCount = int.MaxValue);
 
+    /// <summary>
+    /// Applies a new guest scheduling priority to a live thread, mapping it
+    /// onto the host thread if one is running. Returns false when the thread
+    /// handle is unknown.
+    /// </summary>
+    bool TrySetGuestThreadPriority(ulong guestThreadHandle, int guestPriority);
+
+    /// <summary>
+    /// Records a new affinity mask for a guest thread and re-applies it to
+    /// the host thread where the platform supports it.
+    /// </summary>
+    bool TrySetGuestThreadAffinity(ulong guestThreadHandle, ulong affinityMask);
+
     IReadOnlyList<GuestThreadSnapshot> SnapshotThreads();
 
     bool TryCallGuestFunction(
@@ -65,11 +86,36 @@ public interface IGuestThreadScheduler
         string reason,
         out string? error);
 
+    bool TryCallGuestFunction(
+        CpuContext callerContext,
+        ulong entryPoint,
+        ulong arg0,
+        ulong arg1,
+        ulong arg2,
+        ulong stackAddress,
+        ulong stackSize,
+        string reason,
+        out ulong returnValue,
+        out string? error);
+
     bool TryCallGuestContinuation(
         CpuContext callerContext,
         GuestCpuContinuation continuation,
         string reason,
         out string? error);
+
+    /// <summary>
+    /// Asynchronously invokes an installed kernel exception handler as the
+    /// target guest thread. This is used by IL2CPP's stop-the-world collector:
+    /// the handler acknowledges suspension and may remain blocked until the
+    /// collecting thread resumes it.
+    /// </summary>
+    bool TryRaiseGuestException(
+        CpuContext callerContext,
+        ulong threadHandle,
+        ulong handler,
+        int exceptionType,
+        out string? error);
 }
 
 public readonly record struct GuestImportCallFrame(
@@ -94,13 +140,34 @@ public readonly record struct GuestCpuContinuation(
     ulong Rdi,
     ulong R8,
     ulong R9,
+    ulong R10,
+    ulong R11,
     ulong R12,
     ulong R13,
     ulong R14,
-    ulong R15);
+    ulong R15,
+    ushort FpuControlWord,
+    uint Mxcsr,
+    bool RestoreFullFpuState);
 
 public static class GuestThreadExecution
 {
+    private sealed class DelegateGuestThreadBlockWaiter : IGuestThreadBlockWaiter
+    {
+        private readonly Func<int> _resume;
+        private readonly Func<bool> _tryWake;
+
+        public DelegateGuestThreadBlockWaiter(Func<int> resume, Func<bool> tryWake)
+        {
+            _resume = resume;
+            _tryWake = tryWake;
+        }
+
+        public int Resume() => _resume();
+
+        public bool TryWake() => _tryWake();
+    }
+
     [ThreadStatic]
     private static ulong _currentGuestThreadHandle;
 
@@ -246,6 +313,23 @@ public static class GuestThreadExecution
         return true;
     }
 
+    // Compatibility bridge for exports that still describe blocked work as a
+    // resume/wake delegate pair. New hot paths should provide an
+    // IGuestThreadBlockWaiter directly to avoid allocating closures.
+    public static bool RequestCurrentThreadBlock(
+        CpuContext? context,
+        string reason,
+        string? wakeKey,
+        Func<int> resumeHandler,
+        Func<bool> wakeHandler,
+        long blockDeadlineTimestamp = 0) =>
+        RequestCurrentThreadBlock(
+            context,
+            reason,
+            wakeKey,
+            new DelegateGuestThreadBlockWaiter(resumeHandler, wakeHandler),
+            blockDeadlineTimestamp);
+
     public static bool TryConsumeCurrentThreadBlock(out string reason)
     {
         return TryConsumeCurrentThreadBlock(out reason, out _, out _);
@@ -314,6 +398,27 @@ public static class GuestThreadExecution
         return true;
     }
 
+    public static bool TryConsumeCurrentThreadBlock(
+        out string reason,
+        out GuestCpuContinuation continuation,
+        out bool hasContinuation,
+        out string wakeKey,
+        out Func<int>? resumeHandler,
+        out Func<bool>? wakeHandler,
+        out long blockDeadlineTimestamp)
+    {
+        var consumed = TryConsumeCurrentThreadBlock(
+            out reason,
+            out continuation,
+            out hasContinuation,
+            out wakeKey,
+            out var waiter,
+            out blockDeadlineTimestamp);
+        resumeHandler = waiter is null ? null : waiter.Resume;
+        wakeHandler = waiter is null ? null : waiter.TryWake;
+        return consumed;
+    }
+
     public static long ComputeDeadlineTimestamp(TimeSpan timeout)
     {
         if (timeout <= TimeSpan.Zero)
@@ -360,10 +465,15 @@ public static class GuestThreadExecution
             context[CpuRegister.Rdi],
             context[CpuRegister.R8],
             context[CpuRegister.R9],
+            context[CpuRegister.R10],
+            context[CpuRegister.R11],
             context[CpuRegister.R12],
             context[CpuRegister.R13],
             context[CpuRegister.R14],
-            context[CpuRegister.R15]);
+            context[CpuRegister.R15],
+            context.FpuControlWord,
+            context.Mxcsr,
+            RestoreFullFpuState: false);
         return true;
     }
 

src/SharpEmu.HLE/GuestTlsTemplate.cs

@@ -0,0 +1,442 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Runtime.InteropServices;
+using System.Diagnostics;
+
+namespace SharpEmu.HLE;
+
+/// <summary>
+/// Process-wide registry of ELF PT_TLS templates and per-thread dynamic thread
+/// vectors. AMD64 uses TLS Variant II: startup/static module blocks precede the
+/// thread pointer, while modules introduced after a thread was initialized are
+/// represented by separately allocated DTV entries.
+/// </summary>
+public static class GuestTlsTemplate
+{
+    // Must match CpuDispatcher/DirectExecutionBackend's mapped prefix. PS5
+    // modules can require more than one host page of Variant II static TLS;
+    // Dreaming Sarah's startup image, for example, reaches 0x1870 bytes.
+    public const ulong StartupStaticTlsReservation = 0x10000UL;
+    private static readonly object _gate = new();
+    private static readonly SortedDictionary<ulong, ModuleTemplate> _modules = new();
+    private static readonly Dictionary<ulong, ThreadDtv> _threadDtvs = new();
+    private static ulong _staticTlsSize;
+    private static ulong _maximumAlignment = 1;
+    private static ulong _generation;
+
+    static GuestTlsTemplate()
+    {
+        RunTlsLayoutSelfChecks();
+    }
+
+    private sealed class ModuleTemplate
+    {
+        public required ulong ModuleId { get; init; }
+        public required byte[] InitImage { get; init; }
+        public required ulong MemorySize { get; init; }
+        public required ulong Alignment { get; init; }
+        public required ulong AlignmentBias { get; init; }
+        public required ulong StaticOffset { get; init; }
+    }
+
+    private sealed class ThreadDtv
+    {
+        public ulong Generation { get; set; }
+        public Dictionary<ulong, DtvEntry> Entries { get; } = new();
+        public nint DtvAllocationBase { get; set; }
+        public ulong DtvAddress { get; set; }
+    }
+
+    private sealed class DtvEntry
+    {
+        public required ulong Address { get; init; }
+        public nint AllocationBase { get; init; }
+    }
+
+    /// <summary>Main executable's initialized PT_TLS bytes.</summary>
+    public static byte[] InitImage
+    {
+        get
+        {
+            lock (_gate)
+            {
+                return _modules.TryGetValue(1, out var module)
+                    ? (byte[])module.InitImage.Clone()
+                    : [];
+            }
+        }
+    }
+
+    /// <summary>Aligned size of the main executable's static TLS block.</summary>
+    public static ulong BlockSize
+    {
+        get
+        {
+            lock (_gate)
+            {
+                return _modules.TryGetValue(1, out var module)
+                    ? module.StaticOffset
+                    : 0;
+            }
+        }
+    }
+
+    /// <summary>Main executable's PT_TLS alignment.</summary>
+    public static ulong Alignment
+    {
+        get
+        {
+            lock (_gate)
+            {
+                return _modules.TryGetValue(1, out var module)
+                    ? module.Alignment
+                    : 1;
+            }
+        }
+    }
+
+    /// <summary>Total Variant II static TLS span required below the TCB.</summary>
+    public static ulong StaticTlsSize
+    {
+        get { lock (_gate) { return _staticTlsSize; } }
+    }
+
+    /// <summary>Largest PT_TLS alignment required by the registered modules.</summary>
+    public static ulong MaximumAlignment
+    {
+        get { lock (_gate) { return _maximumAlignment; } }
+    }
+
+    /// <summary>Current DTV generation, incremented for every registered module.</summary>
+    public static ulong Generation
+    {
+        get { lock (_gate) { return _generation; } }
+    }
+
+    /// <summary>
+    /// Backwards-compatible main-module registration entry point.
+    /// </summary>
+    public static void Set(ReadOnlySpan<byte> initImage, ulong memorySize, ulong alignment)
+    {
+        Reset();
+        RegisterModule(1, initImage, memorySize, alignment, alignmentBias: 0);
+    }
+
+    /// <summary>
+    /// Registers one module's PT_TLS template and allocates its Variant II
+    /// static offset. Modules must be registered in loader module-ID order.
+    /// </summary>
+    public static ulong RegisterModule(
+        ulong moduleId,
+        ReadOnlySpan<byte> initImage,
+        ulong memorySize,
+        ulong alignment,
+        ulong alignmentBias = 0)
+    {
+        if (moduleId == 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(moduleId));
+        }
+
+        var normalizedAlignment = alignment == 0 ? 1 : alignment;
+        if ((normalizedAlignment & (normalizedAlignment - 1)) != 0)
+        {
+            throw new InvalidDataException($"PT_TLS alignment 0x{alignment:X} is not a power of two.");
+        }
+        if (memorySize > int.MaxValue || (ulong)initImage.Length > memorySize)
+        {
+            throw new InvalidDataException("PT_TLS template size is invalid or exceeds the supported process limit.");
+        }
+
+        lock (_gate)
+        {
+            if (_modules.TryGetValue(moduleId, out var existing))
+            {
+                if (existing.MemorySize != memorySize ||
+                    existing.Alignment != normalizedAlignment ||
+                    existing.AlignmentBias != alignmentBias ||
+                    !existing.InitImage.AsSpan().SequenceEqual(initImage))
+                {
+                    throw new InvalidOperationException($"TLS module {moduleId} was registered with a different template.");
+                }
+
+                return existing.StaticOffset;
+            }
+
+            // FreeBSD/AMD64 Variant II: choose the smallest offset satisfying
+            // offset - previous >= size and (-offset) % align == p_vaddr % align.
+            var staticOffset = CalculateStaticOffset(
+                _staticTlsSize,
+                memorySize,
+                normalizedAlignment,
+                alignmentBias);
+            if (staticOffset > StartupStaticTlsReservation)
+            {
+                throw new InvalidOperationException(
+                    $"Static TLS requires 0x{staticOffset:X} bytes, but startup maps only " +
+                    $"0x{StartupStaticTlsReservation:X} bytes below the thread pointer.");
+            }
+            _modules.Add(moduleId, new ModuleTemplate
+            {
+                ModuleId = moduleId,
+                InitImage = initImage.ToArray(),
+                MemorySize = memorySize,
+                Alignment = normalizedAlignment,
+                AlignmentBias = alignmentBias,
+                StaticOffset = staticOffset,
+            });
+            _staticTlsSize = staticOffset;
+            _maximumAlignment = Math.Max(_maximumAlignment, normalizedAlignment);
+            _generation++;
+            return staticOffset;
+        }
+    }
+
+    /// <summary>Returns the static TP-relative block offset for a module.</summary>
+    public static bool TryGetStaticOffset(ulong moduleId, out ulong staticOffset)
+    {
+        lock (_gate)
+        {
+            if (_modules.TryGetValue(moduleId, out var module))
+            {
+                staticOffset = module.StaticOffset;
+                return true;
+            }
+        }
+
+        staticOffset = 0;
+        return false;
+    }
+
+    /// <summary>Clears all module templates and frees dynamic DTV blocks.</summary>
+    public static void Reset()
+    {
+        lock (_gate)
+        {
+            foreach (var dtv in _threadDtvs.Values)
+            {
+                FreeDynamicEntries(dtv);
+            }
+
+            _threadDtvs.Clear();
+            _modules.Clear();
+            _staticTlsSize = 0;
+            _maximumAlignment = 1;
+            _generation++;
+        }
+    }
+
+    /// <summary>
+    /// Initializes every currently registered startup TLS block for a thread
+    /// and records their addresses in that thread's DTV.
+    /// </summary>
+    public static void SeedThreadBlock(CpuContext context, ulong threadPointer)
+    {
+        ArgumentNullException.ThrowIfNull(context);
+        if (threadPointer == 0)
+        {
+            return;
+        }
+
+        lock (_gate)
+        {
+            if (_threadDtvs.Remove(threadPointer, out var oldDtv))
+            {
+                FreeDynamicEntries(oldDtv);
+            }
+
+            var dtv = new ThreadDtv();
+            _threadDtvs.Add(threadPointer, dtv);
+            foreach (var module in _modules.Values)
+            {
+                dtv.Entries[module.ModuleId] = CreateStaticOrDynamicEntry(context, threadPointer, module);
+            }
+            RebuildGuestDtv(context, threadPointer, dtv);
+        }
+    }
+
+    /// <summary>
+    /// Implements the DTV lookup used by <c>__tls_get_addr</c>. Unknown module
+    /// IDs and offsets outside the module's TLS image are rejected with zero.
+    /// </summary>
+    public static ulong ResolveAddress(CpuContext context, ulong moduleId, ulong offset)
+    {
+        ArgumentNullException.ThrowIfNull(context);
+        if (context.FsBase == 0 || moduleId == 0)
+        {
+            return 0;
+        }
+
+        lock (_gate)
+        {
+            if (!_modules.TryGetValue(moduleId, out var module) || offset >= module.MemorySize)
+            {
+                return 0;
+            }
+
+            if (!_threadDtvs.TryGetValue(context.FsBase, out var dtv))
+            {
+                dtv = new ThreadDtv();
+                _threadDtvs.Add(context.FsBase, dtv);
+                foreach (var startupModule in _modules.Values)
+                {
+                    dtv.Entries[startupModule.ModuleId] = CreateStaticOrDynamicEntry(context, context.FsBase, startupModule);
+                }
+                RebuildGuestDtv(context, context.FsBase, dtv);
+            }
+
+            var entryAdded = false;
+            if (!dtv.Entries.TryGetValue(moduleId, out var entry))
+            {
+                // This module appeared after the thread's startup TLS layout was
+                // seeded. Model rtld's lazy DTV allocation instead of assuming
+                // unused space exists below the already-live thread pointer.
+                entry = CreateDynamicEntry(module);
+                dtv.Entries.Add(moduleId, entry);
+                entryAdded = true;
+            }
+
+            if (entryAdded || dtv.Generation != _generation)
+            {
+                RebuildGuestDtv(context, context.FsBase, dtv);
+            }
+
+            return checked(entry.Address + offset);
+        }
+    }
+
+    private static DtvEntry CreateStaticOrDynamicEntry(
+        CpuContext context,
+        ulong threadPointer,
+        ModuleTemplate module)
+    {
+        if (threadPointer >= module.StaticOffset)
+        {
+            var address = threadPointer - module.StaticOffset;
+            var zeroImage = module.MemorySize == 0 ? [] : new byte[(int)module.MemorySize];
+            if ((zeroImage.Length == 0 || context.Memory.TryWrite(address, zeroImage)) &&
+                (module.InitImage.Length == 0 || context.Memory.TryWrite(address, module.InitImage)))
+            {
+                return new DtvEntry { Address = address };
+            }
+        }
+
+        return CreateDynamicEntry(module);
+    }
+
+    private static DtvEntry CreateDynamicEntry(ModuleTemplate module)
+    {
+        var size = Math.Max(1UL, module.MemorySize);
+        var allocationSize = checked(size + module.Alignment - 1);
+        if (allocationSize > int.MaxValue)
+        {
+            throw new OutOfMemoryException("TLS module allocation exceeds the supported host allocation size.");
+        }
+
+        var allocationBase = Marshal.AllocHGlobal((int)allocationSize);
+        var alignedAddress = AlignUp(unchecked((ulong)allocationBase), module.Alignment);
+        Marshal.Copy(new byte[(int)size], 0, unchecked((nint)alignedAddress), (int)size);
+        if (module.InitImage.Length != 0)
+        {
+            Marshal.Copy(module.InitImage, 0, unchecked((nint)alignedAddress), module.InitImage.Length);
+        }
+
+        return new DtvEntry
+        {
+            Address = alignedAddress,
+            AllocationBase = allocationBase,
+        };
+    }
+
+    private static void FreeDynamicEntries(ThreadDtv dtv)
+    {
+        foreach (var entry in dtv.Entries.Values)
+        {
+            if (entry.AllocationBase != 0)
+            {
+                Marshal.FreeHGlobal(entry.AllocationBase);
+            }
+        }
+        if (dtv.DtvAllocationBase != 0)
+        {
+            Marshal.FreeHGlobal(dtv.DtvAllocationBase);
+            dtv.DtvAllocationBase = 0;
+            dtv.DtvAddress = 0;
+        }
+    }
+
+    private static void RebuildGuestDtv(CpuContext context, ulong threadPointer, ThreadDtv dtv)
+    {
+        var maximumModuleId = _modules.Count == 0 ? 0UL : _modules.Keys.Max();
+        var byteSize = checked(2UL * sizeof(ulong) + maximumModuleId * sizeof(ulong));
+        if (byteSize > int.MaxValue)
+        {
+            throw new OutOfMemoryException("Guest DTV exceeds the supported host allocation size.");
+        }
+
+        var newAllocation = Marshal.AllocHGlobal((int)Math.Max((ulong)sizeof(ulong) * 2, byteSize));
+        var newAddress = unchecked((ulong)newAllocation);
+        Marshal.Copy(new byte[(int)Math.Max((ulong)sizeof(ulong) * 2, byteSize)], 0, newAllocation, (int)Math.Max((ulong)sizeof(ulong) * 2, byteSize));
+        Marshal.WriteInt64(newAllocation, 0, unchecked((long)_generation));
+        Marshal.WriteInt64(newAllocation, sizeof(ulong), unchecked((long)maximumModuleId));
+        foreach (var (moduleId, entry) in dtv.Entries)
+        {
+            var slotOffset = checked((int)(2UL * sizeof(ulong) + (moduleId - 1) * sizeof(ulong)));
+            Marshal.WriteInt64(newAllocation, slotOffset, unchecked((long)entry.Address));
+        }
+
+        if (!context.TryWriteUInt64(threadPointer + sizeof(ulong), newAddress))
+        {
+            Marshal.FreeHGlobal(newAllocation);
+            throw new InvalidOperationException("Failed to install the guest DTV pointer in the thread control block.");
+        }
+
+        if (dtv.DtvAllocationBase != 0)
+        {
+            Marshal.FreeHGlobal(dtv.DtvAllocationBase);
+        }
+        dtv.DtvAllocationBase = newAllocation;
+        dtv.DtvAddress = newAddress;
+        dtv.Generation = _generation;
+    }
+
+    private static ulong AlignUp(ulong value, ulong alignment)
+    {
+        var mask = alignment - 1;
+        return checked((value + mask) & ~mask);
+    }
+
+    private static ulong CalculateStaticOffset(
+        ulong previousOffset,
+        ulong size,
+        ulong alignment,
+        ulong alignmentBias)
+    {
+        var result = checked(previousOffset + size + alignment - 1);
+        return result - ((result + alignmentBias) & (alignment - 1));
+    }
+
+    [Conditional("DEBUG")]
+    private static void RunTlsLayoutSelfChecks()
+    {
+        var firstOffset = RegisterModule(1, [0x11, 0x22], 0x20, 0x10, 0);
+        var secondOffset = RegisterModule(2, [0x7A], 0x18, 0x20, 8);
+        Debug.Assert(firstOffset == 0x20, "First Variant II TLS offset is incorrect.");
+        Debug.Assert(secondOffset >= firstOffset + 0x18, "TLS modules overlap in the static layout.");
+        Debug.Assert((unchecked(0UL - secondOffset) & 0x1F) == 8, "PT_TLS virtual-address congruence was not preserved.");
+
+        var lateEntry = CreateDynamicEntry(_modules[2]);
+        try
+        {
+            Debug.Assert(lateEntry.AllocationBase != 0, "A late TLS module did not receive a dynamic DTV block.");
+            Debug.Assert(Marshal.ReadByte(unchecked((nint)lateEntry.Address)) == 0x7A, "Late-module tdata was not initialized.");
+            Debug.Assert(Marshal.ReadByte(unchecked((nint)lateEntry.Address + 1)) == 0, "Late-module tbss was not zero initialized.");
+        }
+        finally
+        {
+            Marshal.FreeHGlobal(lateEntry.AllocationBase);
+            Reset();
+        }
+    }
+}

src/SharpEmu.HLE/HleDataSymbols.cs

@@ -13,7 +13,9 @@ public static class HleDataSymbols
     private const string LibcNeedFlagNid = "P330P3dFF68";
     private const string LibcInternalNeedFlagNid = "ZT4ODD2Ts9o";
     private const int ProgNameMaxBytes = 511;
-    private const ulong StackChkGuardValue = 0xC0DEC0DECAFEBABEUL;
+    // Terminator canaries reserve the low byte as NUL. Keep the process data
+    // symbol and every per-thread TLS copy byte-for-byte identical.
+    private const ulong StackChkGuardValue = 0xC0DEC0DECAFEBA00UL;
 
     private static readonly object _gate = new();
     private static readonly nint _stackChkGuardAddress = Allocate(sizeof(ulong) * 2);

src/SharpEmu.HLE/Host/Posix/PosixHostInput.cs

@@ -69,11 +69,118 @@ public sealed class PosixHostInput : IHostInput
     {
         // GLFW only delivers key events to the focused window, so a
         // delivering keyboard implies focus.
-        return _source?.HasKeyboardFocus ?? false;
+        return _source?.HasKeyboardFocus ?? IsEmbeddedX11WindowFocused();
     }
 
     public bool IsKeyDown(int virtualKey)
     {
-        return _source?.IsKeyDown(virtualKey) ?? false;
+        var source = _source;
+        if (source is not null)
+        {
+            return source.IsKeyDown(virtualKey);
+        }
+
+        return IsEmbeddedX11WindowFocused() && IsEmbeddedX11KeyDown(virtualKey);
     }
+
+    private static bool IsEmbeddedX11WindowFocused()
+    {
+        if (!OperatingSystem.IsLinux())
+        {
+            return false;
+        }
+
+        var display = HostSessionControl.EmbeddedHostDisplay;
+        var window = HostSessionControl.EmbeddedHostWindow;
+        if (display == 0 || window == 0 || XGetInputFocus(display, out var focusedWindow, out _) == 0 || focusedWindow == 0)
+        {
+            return false;
+        }
+
+        return GetTopLevelWindow(display, focusedWindow) == GetTopLevelWindow(display, window);
+    }
+
+    private static bool IsEmbeddedX11KeyDown(int virtualKey)
+    {
+        var display = HostSessionControl.EmbeddedHostDisplay;
+        var keysym = ToX11Keysym(virtualKey);
+        if (display == 0 || keysym == 0)
+        {
+            return false;
+        }
+
+        var keycode = XKeysymToKeycode(display, keysym);
+        if (keycode == 0)
+        {
+            return false;
+        }
+
+        var keymap = new byte[32];
+        XQueryKeymap(display, keymap);
+        return (keymap[keycode >> 3] & (1 << (keycode & 7))) != 0;
+    }
+
+    private static nint GetTopLevelWindow(nint display, nint window)
+    {
+        var current = window;
+        for (var depth = 0; depth < 16; depth++)
+        {
+            if (XQueryTree(display, current, out var root, out var parent, out var children, out _) == 0)
+            {
+                return 0;
+            }
+
+            if (children != 0)
+            {
+                XFree(children);
+            }
+
+            if (parent == 0 || parent == root)
+            {
+                return current;
+            }
+
+            current = parent;
+        }
+
+        return 0;
+    }
+
+    private static nuint ToX11Keysym(int virtualKey)
+    {
+        return virtualKey switch
+        {
+            0x08 => 0xFF08, // Backspace
+            0x09 => 0xFF09, // Tab
+            0x0D => 0xFF0D, // Return
+            0x1B => 0xFF1B, // Escape
+            0x25 => 0xFF51, // Left
+            0x26 => 0xFF52, // Up
+            0x27 => 0xFF53, // Right
+            0x28 => 0xFF54, // Down
+            >= 0x41 and <= 0x5A => (nuint)virtualKey,
+            _ => 0,
+        };
+    }
+
+    [System.Runtime.InteropServices.DllImport("libX11.so.6")]
+    private static extern int XGetInputFocus(nint display, out nint focus, out int revertTo);
+
+    [System.Runtime.InteropServices.DllImport("libX11.so.6")]
+    private static extern int XQueryKeymap(nint display, [System.Runtime.InteropServices.Out] byte[] keysReturn);
+
+    [System.Runtime.InteropServices.DllImport("libX11.so.6")]
+    private static extern byte XKeysymToKeycode(nint display, nuint keysym);
+
+    [System.Runtime.InteropServices.DllImport("libX11.so.6")]
+    private static extern int XQueryTree(
+        nint display,
+        nint window,
+        out nint root,
+        out nint parent,
+        out nint children,
+        out uint childCount);
+
+    [System.Runtime.InteropServices.DllImport("libX11.so.6")]
+    private static extern int XFree(nint data);
 }

src/SharpEmu.HLE/Host/Posix/PosixHostMemory.cs

@@ -163,13 +163,18 @@ internal sealed unsafe class PosixHostMemory : IHostMemory
         private const int PROT_EXEC = 0x4;
 
         private const int MAP_PRIVATE = 0x02;
-        private const int MAP_FIXED = 0x10;
         private static readonly int MAP_ANON = OperatingSystem.IsMacOS() ? 0x1000 : 0x20;
         private static readonly int MAP_NORESERVE = OperatingSystem.IsMacOS() ? 0 : 0x4000;
 
         // Linux-only: fail instead of clobbering an existing mapping.
         private const int MAP_FIXED_NOREPLACE = 0x100000;
 
+        private const int KERN_SUCCESS = 0;
+
+        // On Darwin fixed placement is represented by the absence of
+        // VM_FLAGS_ANYWHERE. Do not add VM_FLAGS_OVERWRITE: overlap must fail.
+        private const int VM_FLAGS_FIXED = 0;
+
         private static readonly nint MAP_FAILED = -1;
 
         private static readonly object Gate = new();
@@ -181,6 +186,7 @@ internal sealed unsafe class PosixHostMemory : IHostMemory
             public ulong Size;
             public uint DefaultProtect;
             public Dictionary<ulong, uint>? PageProtects;
+            public bool UsesMachAllocation;
 
             public ulong End => Base + Size;
 
@@ -251,6 +257,7 @@ internal sealed unsafe class PosixHostMemory : IHostMemory
                 }
 
                 nint result;
+                var usesMachAllocation = false;
                 if (address != null)
                 {
                     // Win32 maps at exactly the requested address or fails
@@ -280,15 +287,17 @@ internal sealed unsafe class PosixHostMemory : IHostMemory
                     if (result == MAP_FAILED && OperatingSystem.IsMacOS())
                     {
                         // The hint-only attempt above didn't land at the requested
-                        // address. This is routinely the case for the PS5's fixed
-                        // 32 GiB image base under Rosetta 2 on Apple Silicon, where
-                        // the kernel never honors that hint. Retry with true
-                        // MAP_FIXED: this can clobber an untracked host mapping
-                        // (dyld, the runtime's JIT heap, Rosetta) if one already
-                        // sits exactly there, but without it guest images that
-                        // require this base never load at all on macOS.
-                        Trace($"exact mmap hint failed, retrying with MAP_FIXED: addr=0x{(ulong)address:X16}");
-                        result = mmap((nint)address, (nuint)alignedSize, posixProtect, flags | MAP_FIXED, -1, 0);
+                        // address. mach_vm_allocate with fixed placement and no
+                        // overwrite flag atomically maps the requested range or
+                        // fails if any host mapping already owns it. Unlike
+                        // MAP_FIXED, it cannot clobber CLR, dyld, JIT, or Rosetta
+                        // memory that is absent from our shadow table.
+                        Trace($"exact mmap hint failed, retrying with fixed Mach allocation: addr=0x{(ulong)address:X16}");
+                        result = AllocateDarwinFixed(
+                            (nint)address,
+                            alignedSize,
+                            posixProtect);
+                        usesMachAllocation = result != MAP_FAILED;
                     }
 
                     if (result == MAP_FAILED || (ulong)result != (ulong)address)
@@ -316,7 +325,8 @@ internal sealed unsafe class PosixHostMemory : IHostMemory
                 {
                     Base = (ulong)result,
                     Size = alignedSize,
-                    DefaultProtect = protect
+                    DefaultProtect = protect,
+                    UsesMachAllocation = usesMachAllocation,
                 };
 
                 return (void*)result;
@@ -335,8 +345,15 @@ internal sealed unsafe class PosixHostMemory : IHostMemory
                     return false;
                 }
 
-                Regions.Remove((ulong)address);
-                return munmap((nint)address, (nuint)region.Size) == 0;
+                var released = region.UsesMachAllocation
+                    ? mach_vm_deallocate(mach_task_self(), (ulong)address, region.Size) == KERN_SUCCESS
+                    : munmap((nint)address, (nuint)region.Size) == 0;
+                if (released)
+                {
+                    Regions.Remove((ulong)address);
+                }
+
+                return released;
             }
         }
 
@@ -504,6 +521,40 @@ internal sealed unsafe class PosixHostMemory : IHostMemory
             };
         }
 
+        private static nint AllocateDarwinFixed(nint requestedAddress, ulong size, int posixProtect)
+        {
+            var address = (ulong)requestedAddress;
+            var result = mach_vm_allocate(
+                mach_task_self(),
+                ref address,
+                size,
+                VM_FLAGS_FIXED);
+            if (result != KERN_SUCCESS || address != (ulong)requestedAddress)
+            {
+                if (result == KERN_SUCCESS)
+                {
+                    _ = mach_vm_deallocate(mach_task_self(), address, size);
+                }
+
+                Trace(
+                    $"fixed Mach allocation failed: addr=0x{(ulong)requestedAddress:X16} " +
+                    $"size=0x{size:X} kern_return={result}");
+                return MAP_FAILED;
+            }
+
+            if (mprotect((nint)address, (nuint)size, posixProtect) == 0)
+            {
+                return (nint)address;
+            }
+
+            var error = Marshal.GetLastPInvokeError();
+            _ = mach_vm_deallocate(mach_task_self(), address, size);
+            Trace(
+                $"fixed Mach allocation protection failed: addr=0x{address:X16} " +
+                $"size=0x{size:X} errno={error}");
+            return MAP_FAILED;
+        }
+
         private static void Trace(string message)
         {
             if (string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_VMEM"), "1", StringComparison.Ordinal))
@@ -524,5 +575,14 @@ internal sealed unsafe class PosixHostMemory : IHostMemory
 
         [DllImport("libc", SetLastError = true)]
         private static extern int mprotect(nint addr, nuint length, int prot);
+
+        [DllImport("libSystem.B.dylib")]
+        private static extern uint mach_task_self();
+
+        [DllImport("libSystem.B.dylib")]
+        private static extern int mach_vm_allocate(uint target, ref ulong address, ulong size, int flags);
+
+        [DllImport("libSystem.B.dylib")]
+        private static extern int mach_vm_deallocate(uint target, ulong address, ulong size);
     }
 }

src/SharpEmu.HLE/Host/Windows/WindowsDualSenseReader.cs

@@ -10,7 +10,7 @@ namespace SharpEmu.HLE.Host.Windows;
 /// Supports USB (input report 0x01) and Bluetooth (extended report 0x31,
 /// activated by requesting feature report 0x05), with hot-plug retry.
 /// </summary>
-internal static class WindowsDualSenseReader
+public static class WindowsDualSenseReader
 {
     private const ushort SonyVendorId = 0x054C;
     private const ushort DualSenseProductId = 0x0CE6;
@@ -35,7 +35,7 @@ internal static class WindowsDualSenseReader
     private static byte _playerLeds = 0x04; // center LED = player 1
 
     /// <summary>Starts the background reader once; safe to call repeatedly.</summary>
-    internal static void EnsureStarted()
+    public static void EnsureStarted()
     {
         // The GUI source-links this reader and calls it directly, without the
         // host-platform resolution that otherwise guarantees Windows.
@@ -61,7 +61,7 @@ internal static class WindowsDualSenseReader
         }
     }
 
-    internal static bool TryGetState(out HostGamepadState state)
+    public static bool TryGetState(out HostGamepadState state)
     {
         lock (Gate)
         {

src/SharpEmu.HLE/Host/Windows/WindowsHostInput.cs

@@ -67,7 +67,19 @@ internal sealed partial class WindowsHostInput : IHostInput
         }
 
         GetWindowThreadProcessId(foregroundWindow, out var processId);
-        return processId == (uint)Environment.ProcessId;
+        if (processId == (uint)Environment.ProcessId)
+        {
+            return true;
+        }
+
+        // The GUI runs the emulator in an isolated child process. Its native
+        // Vulkan surface is a child of the GUI window, so the foreground
+        // window belongs to the launcher process rather than this one.
+        var embeddedHostWindow = HostSessionControl.EmbeddedHostWindow;
+        var hostTopLevelWindow = embeddedHostWindow == 0
+            ? 0
+            : GetAncestor(embeddedHostWindow, GetAncestorRoot);
+        return hostTopLevelWindow != 0 && foregroundWindow == hostTopLevelWindow;
     }
 
     public bool IsKeyDown(int virtualKey) =>
@@ -81,4 +93,9 @@ internal sealed partial class WindowsHostInput : IHostInput
 
     [LibraryImport("user32.dll")]
     private static partial uint GetWindowThreadProcessId(nint hWnd, out uint processId);
+
+    [LibraryImport("user32.dll")]
+    private static partial nint GetAncestor(nint hWnd, uint gaFlags);
+
+    private const uint GetAncestorRoot = 2;
 }

src/SharpEmu.HLE/Host/Windows/WindowsXInputReader.cs

@@ -11,7 +11,7 @@ namespace SharpEmu.HLE.Host.Windows;
 /// <see cref="HostGamepadState"/> conventions. Supports rumble and hot-plug
 /// retry; the first connected slot (of four) is used.
 /// </summary>
-internal static partial class WindowsXInputReader
+public static partial class WindowsXInputReader
 {
     private const uint ErrorSuccess = 0;
     private const int SlotCount = 4;
@@ -43,7 +43,7 @@ internal static partial class WindowsXInputReader
     private static byte _triggerRight;
 
     /// <summary>Starts the background reader once; safe to call repeatedly.</summary>
-    internal static void EnsureStarted()
+    public static void EnsureStarted()
     {
         // The GUI source-links this reader and calls it directly, without the
         // host-platform resolution that otherwise guarantees Windows.
@@ -69,7 +69,7 @@ internal static partial class WindowsXInputReader
         }
     }
 
-    internal static bool TryGetState(out HostGamepadState state)
+    public static bool TryGetState(out HostGamepadState state)
     {
         lock (Gate)
         {

src/SharpEmu.HLE/HostMainThread.cs

@@ -6,12 +6,11 @@ using System.Collections.Concurrent;
 namespace SharpEmu.HLE;
 
 /// <summary>
-/// Runs work on the real process main thread. GLFW windowing must live on
-/// that thread on macOS (AppKit) and Linux (X11's single event queue), so the
-/// CLI moves emulation onto a worker thread, parks the main thread in
-/// <see cref="Pump"/>, and the video presenter posts its window loop here. On
-/// Windows <see cref="IsAvailable"/> stays false and the window keeps its own
-/// thread.
+/// Runs work on the real process main thread. macOS only allows AppKit (and
+/// therefore GLFW windowing) on that thread, so the CLI moves emulation onto
+/// a worker thread, parks the main thread in <see cref="Pump"/>, and the
+/// video presenter posts its window loop here. On other platforms
+/// <see cref="IsAvailable"/> stays false and nothing changes.
 /// </summary>
 public static class HostMainThread
 {

src/SharpEmu.HLE/HostMemory.cs

@@ -0,0 +1,498 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Runtime.InteropServices;
+
+namespace SharpEmu.HLE;
+
+/// <summary>
+/// Cross-platform host virtual memory API with Win32 semantics.
+/// On Windows this forwards directly to kernel32. On POSIX systems it is
+/// implemented over mmap/mprotect/munmap with a shadow region table that
+/// answers VirtualQuery-style questions and tracks page protections.
+/// POSIX anonymous mappings are demand-paged by the kernel, so Win32
+/// "reserve-only" regions are mapped as committed memory directly and
+/// commit requests become protection changes.
+/// </summary>
+public static unsafe class HostMemory
+{
+    public const uint MEM_COMMIT = 0x1000;
+    public const uint MEM_RESERVE = 0x2000;
+    public const uint MEM_RELEASE = 0x8000;
+    public const uint MEM_FREE_STATE = 0x10000;
+    public const uint MEM_PRIVATE = 0x20000;
+
+    public const uint PAGE_NOACCESS = 0x01;
+    public const uint PAGE_READONLY = 0x02;
+    public const uint PAGE_READWRITE = 0x04;
+    public const uint PAGE_EXECUTE = 0x10;
+    public const uint PAGE_EXECUTE_READ = 0x20;
+    public const uint PAGE_EXECUTE_READWRITE = 0x40;
+
+    private const ulong PageSize = 0x1000;
+
+    /// <summary>Win32 MEMORY_BASIC_INFORMATION (64-bit) layout.</summary>
+    public struct BasicInfo
+    {
+        public ulong BaseAddress;
+        public ulong AllocationBase;
+        public uint AllocationProtect;
+        public uint Alignment1;
+        public ulong RegionSize;
+        public uint State;
+        public uint Protect;
+        public uint Type;
+        public uint Alignment2;
+    }
+
+    public static void* Alloc(void* address, nuint size, uint allocationType, uint protect)
+    {
+        if (OperatingSystem.IsWindows())
+        {
+            return Win32VirtualAlloc(address, size, allocationType, protect);
+        }
+
+        return Posix.Alloc(address, size, allocationType, protect);
+    }
+
+    public static bool Free(void* address, nuint size, uint freeType)
+    {
+        if (OperatingSystem.IsWindows())
+        {
+            return Win32VirtualFree(address, size, freeType);
+        }
+
+        return Posix.Free(address, size, freeType);
+    }
+
+    public static bool Protect(void* address, nuint size, uint newProtect, out uint oldProtect)
+    {
+        if (OperatingSystem.IsWindows())
+        {
+            return Win32VirtualProtect(address, size, newProtect, out oldProtect);
+        }
+
+        return Posix.Protect(address, size, newProtect, out oldProtect);
+    }
+
+    public static nuint Query(void* address, out BasicInfo info)
+    {
+        if (OperatingSystem.IsWindows())
+        {
+            return Win32VirtualQuery(address, out info, (nuint)sizeof(BasicInfo));
+        }
+
+        return Posix.Query(address, out info);
+    }
+
+    public static void FlushInstructionCache(void* address, nuint size)
+    {
+        if (OperatingSystem.IsWindows())
+        {
+            Win32FlushInstructionCache(Win32GetCurrentProcess(), address, size);
+            return;
+        }
+
+        // The emulator only executes x86-64 guest code, so a non-Windows host
+        // is either x86-64 (including Rosetta 2 translation) with a coherent
+        // instruction cache, or would need sys_icache_invalidate for a future
+        // arm64 recompiler. Nothing to do today.
+    }
+
+    [DllImport("kernel32.dll", EntryPoint = "VirtualAlloc", SetLastError = true)]
+    private static extern void* Win32VirtualAlloc(void* lpAddress, nuint dwSize, uint flAllocationType, uint flProtect);
+
+    [DllImport("kernel32.dll", EntryPoint = "VirtualFree", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool Win32VirtualFree(void* lpAddress, nuint dwSize, uint dwFreeType);
+
+    [DllImport("kernel32.dll", EntryPoint = "VirtualProtect", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool Win32VirtualProtect(void* lpAddress, nuint dwSize, uint flNewProtect, out uint lpflOldProtect);
+
+    [DllImport("kernel32.dll", EntryPoint = "VirtualQuery")]
+    private static extern nuint Win32VirtualQuery(void* lpAddress, out BasicInfo lpBuffer, nuint dwLength);
+
+    [DllImport("kernel32.dll", EntryPoint = "GetCurrentProcess")]
+    private static extern void* Win32GetCurrentProcess();
+
+    [DllImport("kernel32.dll", EntryPoint = "FlushInstructionCache")]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool Win32FlushInstructionCache(void* hProcess, void* lpBaseAddress, nuint dwSize);
+
+    private static class Posix
+    {
+        private const int PROT_NONE = 0x0;
+        private const int PROT_READ = 0x1;
+        private const int PROT_WRITE = 0x2;
+        private const int PROT_EXEC = 0x4;
+
+        private const int MAP_PRIVATE = 0x02;
+        private const int MAP_FIXED = 0x10;
+        private static readonly int MAP_ANON = OperatingSystem.IsMacOS() ? 0x1000 : 0x20;
+        private static readonly int MAP_NORESERVE = OperatingSystem.IsMacOS() ? 0 : 0x4000;
+
+        // Linux-only: fail instead of clobbering an existing mapping.
+        private const int MAP_FIXED_NOREPLACE = 0x100000;
+
+        private static readonly nint MAP_FAILED = -1;
+
+        private static readonly object Gate = new();
+        private static readonly SortedList<ulong, Region> Regions = new();
+
+        private sealed class Region
+        {
+            public ulong Base;
+            public ulong Size;
+            public uint DefaultProtect;
+            public Dictionary<ulong, uint>? PageProtects;
+
+            public ulong End => Base + Size;
+
+            public uint ProtectAt(ulong pageAddress)
+            {
+                if (PageProtects is not null && PageProtects.TryGetValue(pageAddress, out var overriden))
+                {
+                    return overriden;
+                }
+
+                return DefaultProtect;
+            }
+        }
+
+        public static void* Alloc(void* address, nuint size, uint allocationType, uint protect)
+        {
+            if (size == 0)
+            {
+                return null;
+            }
+
+            var alignedSize = AlignUp((ulong)size, PageSize);
+
+            lock (Gate)
+            {
+                if (allocationType == MEM_COMMIT && address != null &&
+                    TryFindRegionLocked((ulong)address, out var existing))
+                {
+                    // Note: MEM_RESERVE requests that overlap an existing
+                    // region must fail like Win32 does; only a pure commit
+                    // may target pages inside a tracked mapping.
+                    // Commit inside an existing mapping: the pages are already
+                    // backed (demand paged), so only apply the protection.
+                    var start = AlignDown((ulong)address, PageSize);
+                    var end = Math.Min(existing.End, AlignUp((ulong)address + alignedSize, PageSize));
+                    if (end <= start)
+                    {
+                        return null;
+                    }
+
+                    if (mprotect((nint)start, (nuint)(end - start), ToPosixProtect(protect)) != 0)
+                    {
+                        return null;
+                    }
+
+                    SetProtectRangeLocked(existing, start, end - start, protect);
+                    return address;
+                }
+
+                if ((allocationType & MEM_RESERVE) == 0)
+                {
+                    // MEM_COMMIT alone outside any known region is invalid here.
+                    return null;
+                }
+
+                var posixProtect = ToPosixProtect(protect);
+                var flags = MAP_PRIVATE | MAP_ANON;
+                if ((allocationType & MEM_COMMIT) == 0)
+                {
+                    // Reserve-only: keep the requested protection so the region
+                    // is usable without a separate commit step, but tell the
+                    // kernel not to account swap for it where supported.
+                    flags |= MAP_NORESERVE;
+                }
+
+                nint result;
+                if (address != null)
+                {
+                    // Win32 maps at exactly the requested address or fails
+                    // without touching existing mappings. Fail up front on
+                    // any overlap we track, then place the mapping: Linux
+                    // gets MAP_FIXED_NOREPLACE (fails cleanly on host
+                    // mappings too). Darwin lacks NOREPLACE and plain
+                    // MAP_FIXED would silently clobber untracked host
+                    // memory (dyld, the runtime's JIT heap, Rosetta), so
+                    // pass the address as a hint instead -- the kernel
+                    // honors it when the range is free and relocates the
+                    // mapping otherwise, which we treat as failure.
+                    if (OverlapsTrackedRegionLocked((ulong)address, alignedSize))
+                    {
+                        Trace($"exact overlap: addr=0x{(ulong)address:X16} size=0x{alignedSize:X}");
+                        return null;
+                    }
+
+                    var exactFlags = OperatingSystem.IsMacOS() ? flags : flags | MAP_FIXED_NOREPLACE;
+                    result = mmap((nint)address, (nuint)alignedSize, posixProtect, exactFlags, -1, 0);
+                    if (result == MAP_FAILED || (ulong)result != (ulong)address)
+                    {
+                        Trace($"exact mmap failed: addr=0x{(ulong)address:X16} got=0x{(ulong)result:X16} size=0x{alignedSize:X} errno={Marshal.GetLastPInvokeError()}");
+                        if (result != MAP_FAILED)
+                        {
+                            munmap(result, (nuint)alignedSize);
+                        }
+
+                        return null;
+                    }
+                }
+                else
+                {
+                    result = mmap(0, (nuint)alignedSize, posixProtect, flags, -1, 0);
+                    if (result == MAP_FAILED)
+                    {
+                        Trace($"mmap failed: size=0x{alignedSize:X} errno={Marshal.GetLastPInvokeError()}");
+                        return null;
+                    }
+                }
+
+                Regions[(ulong)result] = new Region
+                {
+                    Base = (ulong)result,
+                    Size = alignedSize,
+                    DefaultProtect = protect
+                };
+
+                return (void*)result;
+            }
+        }
+
+        public static bool Free(void* address, nuint size, uint freeType)
+        {
+            _ = size;
+            _ = freeType;
+
+            lock (Gate)
+            {
+                if (!Regions.TryGetValue((ulong)address, out var region))
+                {
+                    return false;
+                }
+
+                Regions.Remove((ulong)address);
+                return munmap((nint)address, (nuint)region.Size) == 0;
+            }
+        }
+
+        public static bool Protect(void* address, nuint size, uint newProtect, out uint oldProtect)
+        {
+            oldProtect = PAGE_NOACCESS;
+            if (size == 0)
+            {
+                return false;
+            }
+
+            var start = AlignDown((ulong)address, PageSize);
+            var end = AlignUp((ulong)address + size, PageSize);
+
+            lock (Gate)
+            {
+                if (!TryFindRegionLocked(start, out var region) || end > region.End)
+                {
+                    return false;
+                }
+
+                oldProtect = region.ProtectAt(start);
+                if (mprotect((nint)start, (nuint)(end - start), ToPosixProtect(newProtect)) != 0)
+                {
+                    return false;
+                }
+
+                SetProtectRangeLocked(region, start, end - start, newProtect);
+                return true;
+            }
+        }
+
+        public static nuint Query(void* address, out BasicInfo info)
+        {
+            info = default;
+            var pageAddress = AlignDown((ulong)address, PageSize);
+
+            lock (Gate)
+            {
+                if (TryFindRegionLocked(pageAddress, out var region))
+                {
+                    // Win32 VirtualQuery reports a run of pages sharing the
+                    // same protection, so stop the run where it changes. Do
+                    // not walk the whole mapping page-by-page here: PS5 GPU
+                    // apertures can span hundreds of GiB, while protection
+                    // overrides are sparse. A tiny read inside such a mapping
+                    // otherwise performs tens of millions of dictionary
+                    // lookups before it can return.
+                    var pageProtects = region.PageProtects;
+                    uint protect;
+                    ulong runEnd;
+                    if (pageProtects is null || pageProtects.Count == 0)
+                    {
+                        protect = region.DefaultProtect;
+                        runEnd = region.End;
+                    }
+                    else if (pageProtects.TryGetValue(pageAddress, out protect))
+                    {
+                        runEnd = pageAddress + PageSize;
+                        while (runEnd < region.End &&
+                            pageProtects.TryGetValue(runEnd, out var nextProtect) &&
+                            nextProtect == protect)
+                        {
+                            runEnd += PageSize;
+                        }
+                    }
+                    else
+                    {
+                        protect = region.DefaultProtect;
+                        runEnd = region.End;
+                        foreach (var overrideAddress in pageProtects.Keys)
+                        {
+                            if (overrideAddress > pageAddress && overrideAddress < runEnd)
+                            {
+                                runEnd = overrideAddress;
+                            }
+                        }
+                    }
+
+                    info.BaseAddress = pageAddress;
+                    info.AllocationBase = region.Base;
+                    info.AllocationProtect = region.DefaultProtect;
+                    info.RegionSize = runEnd - pageAddress;
+                    info.State = MEM_COMMIT;
+                    info.Protect = protect;
+                    info.Type = MEM_PRIVATE;
+                    return (nuint)sizeof(BasicInfo);
+                }
+
+                // Untracked host memory (runtime heaps, stacks, libraries) is
+                // reported as a free block reaching to the next tracked region
+                // so scanning callers keep advancing.
+                var nextBase = ulong.MaxValue;
+                foreach (var regionBase in Regions.Keys)
+                {
+                    if (regionBase > pageAddress)
+                    {
+                        nextBase = regionBase;
+                        break;
+                    }
+                }
+
+                info.BaseAddress = pageAddress;
+                info.AllocationBase = 0;
+                info.AllocationProtect = PAGE_NOACCESS;
+                info.RegionSize = (nextBase == ulong.MaxValue ? pageAddress + PageSize : nextBase) - pageAddress;
+                info.State = MEM_FREE_STATE;
+                info.Protect = PAGE_NOACCESS;
+                info.Type = 0;
+                return (nuint)sizeof(BasicInfo);
+            }
+        }
+
+        private static bool OverlapsTrackedRegionLocked(ulong start, ulong size)
+        {
+            var end = start + size;
+            foreach (var region in Regions.Values)
+            {
+                if (region.Base < end && start < region.End)
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        private static bool TryFindRegionLocked(ulong address, out Region region)
+        {
+            region = null!;
+            var keys = Regions.Keys;
+            var low = 0;
+            var high = keys.Count - 1;
+            Region? candidate = null;
+            while (low <= high)
+            {
+                var middle = low + ((high - low) >> 1);
+                var entry = Regions.Values[middle];
+                if (entry.Base <= address)
+                {
+                    candidate = entry;
+                    low = middle + 1;
+                }
+                else
+                {
+                    high = middle - 1;
+                }
+            }
+
+            if (candidate is null || address >= candidate.End)
+            {
+                return false;
+            }
+
+            region = candidate;
+            return true;
+        }
+
+        private static void SetProtectRangeLocked(Region region, ulong start, ulong size, uint protect)
+        {
+            if (start == region.Base && size >= region.Size)
+            {
+                region.DefaultProtect = protect;
+                region.PageProtects = null;
+                return;
+            }
+
+            region.PageProtects ??= new Dictionary<ulong, uint>();
+            var end = start + size;
+            for (var pageAddress = start; pageAddress < end; pageAddress += PageSize)
+            {
+                if (protect == region.DefaultProtect)
+                {
+                    region.PageProtects.Remove(pageAddress);
+                }
+                else
+                {
+                    region.PageProtects[pageAddress] = protect;
+                }
+            }
+        }
+
+        private static int ToPosixProtect(uint win32Protect)
+        {
+            return win32Protect switch
+            {
+                PAGE_NOACCESS => PROT_NONE,
+                PAGE_READONLY => PROT_READ,
+                PAGE_READWRITE => PROT_READ | PROT_WRITE,
+                PAGE_EXECUTE => PROT_READ | PROT_EXEC,
+                PAGE_EXECUTE_READ => PROT_READ | PROT_EXEC,
+                PAGE_EXECUTE_READWRITE => PROT_READ | PROT_WRITE | PROT_EXEC,
+                _ => PROT_READ | PROT_WRITE
+            };
+        }
+
+        private static void Trace(string message)
+        {
+            if (string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_VMEM"), "1", StringComparison.Ordinal))
+            {
+                Console.Error.WriteLine($"[HOSTMEM] {message}");
+            }
+        }
+
+        private static ulong AlignDown(ulong value, ulong alignment) => value & ~(alignment - 1);
+
+        private static ulong AlignUp(ulong value, ulong alignment) => checked((value + alignment - 1) & ~(alignment - 1));
+
+        [DllImport("libc", SetLastError = true)]
+        private static extern nint mmap(nint addr, nuint length, int prot, int flags, int fd, long offset);
+
+        [DllImport("libc", SetLastError = true)]
+        private static extern int munmap(nint addr, nuint length);
+
+        [DllImport("libc", SetLastError = true)]
+        private static extern int mprotect(nint addr, nuint length, int prot);
+    }
+}

src/SharpEmu.HLE/HostSessionControl.cs

@@ -10,17 +10,88 @@ namespace SharpEmu.HLE;
 public static class HostSessionControl
 {
     private static Action<string>? _shutdownHandler;
+    private static string? _pendingShutdownReason;
+    private static int _shutdownRequested;
+    private static long _embeddedHostWindow;
+    private static long _embeddedHostDisplay;
+
+    /// <summary>
+    /// Indicates that the active host session is being stopped. Runtime code
+    /// uses this to skip expensive post-exit diagnostics before returning the
+    /// GUI to its library.
+    /// </summary>
+    public static bool IsShutdownRequested => Volatile.Read(ref _shutdownRequested) != 0;
+
+    /// <summary>
+    /// Native GUI surface used by an isolated emulator child. Input backends
+    /// use it to treat the launcher window as the active game window.
+    /// </summary>
+    public static nint EmbeddedHostWindow => unchecked((nint)Interlocked.Read(ref _embeddedHostWindow));
+
+    /// <summary>X11 Display* paired with <see cref="EmbeddedHostWindow"/> when available.</summary>
+    public static nint EmbeddedHostDisplay => unchecked((nint)Interlocked.Read(ref _embeddedHostDisplay));
+
+    public static void SetEmbeddedHostSurface(nint window, nint display = 0)
+    {
+        Interlocked.Exchange(ref _embeddedHostDisplay, unchecked((long)display));
+        Interlocked.Exchange(ref _embeddedHostWindow, unchecked((long)window));
+    }
+
+    /// <summary>
+    /// Starts a fresh session after the previous guest has fully left its
+    /// execution backend.
+    /// </summary>
+    public static void ResetShutdownRequest()
+    {
+        Interlocked.Exchange(ref _pendingShutdownReason, null);
+        Volatile.Write(ref _shutdownRequested, 0);
+    }
 
     public static void SetShutdownHandler(Action<string>? handler)
     {
         Volatile.Write(ref _shutdownHandler, handler);
+        if (handler is null)
+        {
+            Interlocked.Exchange(ref _pendingShutdownReason, null);
+            return;
+        }
+
+        var pendingReason = Interlocked.Exchange(ref _pendingShutdownReason, null);
+        if (pendingReason is not null)
+        {
+            Invoke(handler, pendingReason);
+        }
     }
 
     public static void RequestShutdown(string reason)
+    {
+        Volatile.Write(ref _shutdownRequested, 1);
+        var handler = Volatile.Read(ref _shutdownHandler);
+        if (handler is not null)
+        {
+            Invoke(handler, reason);
+            return;
+        }
+
+        // Stop can be pressed while the GUI session is starting. Retain the
+        // request until the native backend installs its cooperative handler.
+        Volatile.Write(ref _pendingShutdownReason, reason);
+        handler = Volatile.Read(ref _shutdownHandler);
+        if (handler is not null)
+        {
+            var pendingReason = Interlocked.Exchange(ref _pendingShutdownReason, null);
+            if (pendingReason is not null)
+            {
+                Invoke(handler, pendingReason);
+            }
+        }
+    }
+
+    private static void Invoke(Action<string> handler, string reason)
     {
         try
         {
-            Volatile.Read(ref _shutdownHandler)?.Invoke(reason);
+            handler(reason);
         }
         catch (Exception exception)
         {

src/SharpEmu.HLE/SharpEmu.HLE.csproj

@@ -14,6 +14,7 @@ SPDX-License-Identifier: GPL-2.0-or-later
 
   <ItemGroup>
     <InternalsVisibleTo Include="SharpEmu.Core" />
+    <InternalsVisibleTo Include="SharpEmu.Libs.Tests" />
   </ItemGroup>
 
   <ItemGroup>

src/SharpEmu.Libs/Agc/AgcPrimaryRegisterDefaults.cs

@@ -0,0 +1,143 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+namespace SharpEmu.Libs.Agc;
+
+public static partial class AgcExports
+{
+    // Exact Gen5 primary register defaults originally reverse-engineered by Kyty (MIT).
+    // Hashes, offsets, and values match the tables consumed by the PS5 AGC SDK.
+    private static RegisterDefaultGroup[] CreatePrimaryRegisterDefaults() =>
+    [
+        // context register groups
+        new(0u, 0u, 0xE24F806Du, [new(0x202u, 0x00CC0010u)]), // CB_COLOR_CONTROL
+        new(0u, 1u, 0xF6C28182u, [new(0x109u, 0x00000000u)]), // CB_DCC_CONTROL
+        new(0u, 2u, 0x6F6E55A5u, [new(0x104u, 0x00000000u)]), // CB_RMI_GL2_CACHE_CONTROL
+        new(0u, 3u, 0x0BC65DA4u, [new(0x08Fu, 0x00000000u)]), // CB_SHADER_MASK
+        new(0u, 4u, 0x9E5AD592u, [new(0x08Eu, 0x0000000Fu)]), // CB_TARGET_MASK
+        new(0u, 5u, 0xBB513B98u, [new(0x2DCu, 0x0000AA00u)]), // DB_ALPHA_TO_MASK
+        new(0u, 6u, 0xAB64B23Bu, [new(0x001u, 0x00000000u)]), // DB_COUNT_CONTROL
+        new(0u, 7u, 0x53C39964u, [new(0x200u, 0x00000000u)]), // DB_DEPTH_CONTROL
+        new(0u, 8u, 0x01396B11u, [new(0x201u, 0x00000000u)]), // DB_EQAA
+        new(0u, 9u, 0x7D42019Au, [new(0x000u, 0x00000000u)]), // DB_RENDER_CONTROL
+        new(0u, 10u, 0x3548F523u, [new(0x006u, 0x00000000u)]), // PS_SHADER_SAMPLE_EXCLUSION_MASK
+        new(0u, 11u, 0xF43AD28Au, [new(0x01Fu, 0x00000000u)]), // DB_RMI_L2_CACHE_CONTROL
+        new(0u, 12u, 0x6DE4C312u, [new(0x203u, 0x00000000u)]), // DB_SHADER_CONTROL
+        new(0u, 13u, 0x00A77AE0u, [new(0x2B0u, 0x00000000u)]), // DB_SRESULTS_COMPARE_STATE0
+        new(0u, 14u, 0x00A779B7u, [new(0x2B1u, 0x00000000u)]), // DB_SRESULTS_COMPARE_STATE1
+        new(0u, 15u, 0x5100100Cu, [new(0x10Cu, 0x00000000u)]), // DB_STENCILREFMASK
+        new(0u, 16u, 0x59958BBAu, [new(0x10Du, 0x00000000u)]), // DB_STENCILREFMASK_BF
+        new(0u, 17u, 0x0C06F17Cu, [new(0x10Bu, 0x00000000u)]), // DB_STENCIL_CONTROL
+        new(0u, 18u, 0x6F104B72u, [new(0x1FFu, 0x00000000u)]), // GE_MAX_OUTPUT_PER_SUBGROUP
+        new(0u, 19u, 0x25C70D9Cu, [new(0x204u, 0x00000000u)]), // PA_CL_CLIP_CNTL
+        new(0u, 20u, 0x3881201Eu, [new(0x20Du, 0x00000000u)]), // PA_CL_OBJPRIM_ID_CNTL
+        new(0u, 21u, 0x09AFDDAFu, [new(0x206u, 0x0000043Fu)]), // PA_CL_VTE_CNTL
+        new(0u, 22u, 0x367D63CFu, [new(0x2F8u, 0x00000000u)]), // PA_SC_AA_CONFIG
+        new(0u, 23u, 0x43707DB8u, [new(0x083u, 0x0000FFFFu)]), // PA_SC_CLIPRECT_RULE
+        new(0u, 24u, 0xF6AE26BAu, [new(0x313u, 0x00000000u)]), // PA_SC_CONSERVATIVE_RASTERIZATION_CNTL
+        new(0u, 25u, 0x1B917652u, [new(0x800003FEu, 0x00000000u)]), // PA_SC_FSR_ENABLE
+        new(0u, 26u, 0x94B1E4F7u, [new(0x0EAu, 0x00000000u)]), // PA_SC_HORIZ_GRID
+        new(0u, 27u, 0xE3661B6Cu, [new(0x0E9u, 0x00000000u)]), // PA_SC_LEFT_VERT_GRID
+        new(0u, 28u, 0x1EB8D73Au, [new(0x292u, 0x00000002u)]), // PA_SC_MODE_CNTL_0
+        new(0u, 29u, 0x15051FA3u, [new(0x293u, 0x00000000u)]), // PA_SC_MODE_CNTL_1
+        new(0u, 30u, 0x9C51A7F1u, [new(0x0E8u, 0x00000000u)]), // PA_SC_RIGHT_VERT_GRID
+        new(0u, 31u, 0xA20EFC70u, [new(0x080u, 0x00000000u)]), // PA_SC_WINDOW_OFFSET
+        new(0u, 32u, 0x0EC09F6Eu, [new(0x211u, 0x00000000u)]), // PA_STATE_STEREO_X
+        new(0u, 33u, 0x34A7D6D3u, [new(0x210u, 0x00000000u)]), // PA_STEREO_CNTL
+        new(0u, 34u, 0xCE831B94u, [new(0x08Du, 0x00000000u)]), // PA_SU_HARDWARE_SCREEN_OFFSET
+        new(0u, 35u, 0x5CC72A74u, [new(0x282u, 0x00000008u)]), // PA_SU_LINE_CNTL
+        new(0u, 36u, 0x3B77713Cu, [new(0x281u, 0xFFFF0000u)]), // PA_SU_POINT_MINMAX
+        new(0u, 37u, 0x40F64410u, [new(0x280u, 0x00080008u)]), // PA_SU_POINT_SIZE
+        new(0u, 38u, 0x69441268u, [new(0x2DFu, 0x00000000u)]), // PA_SU_POLY_OFFSET_CLAMP
+        new(0u, 39u, 0x2E418B83u, [new(0x2DEu, 0x000001E9u)]), // PA_SU_POLY_OFFSET_DB_FMT_CNTL
+        new(0u, 40u, 0xA00D0C8Du, [new(0x205u, 0x00000240u)]), // PA_SU_SC_MODE_CNTL
+        new(0u, 41u, 0xB1289FB3u, [new(0x20Cu, 0x00000001u)]), // PA_SU_SMALL_PRIM_FILTER_CNTL
+        new(0u, 42u, 0x144832FBu, [new(0x2F9u, 0x0000002Du)]), // PA_SU_VTX_CNTL
+        new(0u, 43u, 0x9890D9FAu, [new(0x1BAu, 0x00000000u)]), // SPI_TMPRING_SIZE
+        new(0u, 44u, 0x9016FAF1u, [new(0x2A6u, 0x00000000u)]), // VGT_DRAW_PAYLOAD_CNTL
+        new(0u, 45u, 0x4B73CE27u, [new(0x2CEu, 0x00000400u)]), // VGT_GS_MAX_VERT_OUT
+        new(0u, 46u, 0x5F5A3E7Bu, [new(0x29Bu, 0x00000002u)]), // VGT_GS_OUT_PRIM_TYPE
+        new(0u, 47u, 0xD4AF3A51u, [new(0x2D6u, 0x00000000u)]), // VGT_LS_HS_CONFIG
+        new(0u, 48u, 0x6CF4F543u, [new(0x2A3u, 0xFFFFFFFFu)]), // VGT_PRIMITIVEID_RESET
+        new(0u, 49u, 0x5FB86CCBu, [new(0x2A1u, 0x00000000u)]), // VGT_PRIMITIVEID_EN
+        new(0u, 50u, 0xEDEFA188u, [new(0x2ADu, 0x00000000u)]), // VGT_REUSE_OFF
+        new(0u, 51u, 0xD0DE9EE6u, [new(0x2D5u, 0x00000000u)]), // VGT_SHADER_STAGES_EN
+        new(0u, 52u, 0xC5831803u, [new(0x2D4u, 0x88101000u)]), // VGT_TESS_DISTRIBUTION
+        new(0u, 53u, 0x8E6DE84Bu, [new(0x2DBu, 0x00000000u)]), // VGT_TF_PARAM
+        new(0u, 54u, 0xD0771662u, [new(0x2F5u, 0x00000000u), new(0x2F6u, 0x00000000u)]), // PA_SC_CENTROID_PRIORITY_0, PA_SC_CENTROID_PRIORITY_1
+        new(0u, 55u, 0x569F7444u, [new(0x2FEu, 0x00000000u)]), // PA_SC_AA_SAMPLE_LOCS_PIXEL_X0Y0_0
+        new(0u, 56u, 0x5C6637CDu, [new(0x30Eu, 0xFFFFFFFFu), new(0x30Fu, 0xFFFFFFFFu)]), // PA_SC_AA_MASK_X0Y0_X1Y0, PA_SC_AA_MASK_X0Y1_X1Y1
+        new(0u, 57u, 0xCAE3E690u, [new(0x311u, 0x00000002u), new(0x312u, 0x03FF0080u)]), // PA_SC_BINNER_CNTL_0, PA_SC_BINNER_CNTL_1
+        new(0u, 58u, 0x43FBD769u, [new(0x105u, 0x00000000u), new(0x107u, 0x00000000u), new(0x106u, 0x00000000u), new(0x108u, 0x00000000u)]), // CB_BLEND_RED, CB_BLEND_BLUE, CB_BLEND_GREEN, CB_BLEND_ALPHA
+        new(0u, 59u, 0xEF550356u, [new(0x1E0u, 0x20010001u)]), // CB_BLEND0_CONTROL
+        new(0u, 60u, 0x8F52E279u, [new(0x020u, 0x00000000u), new(0x021u, 0x00000000u)]), // TA_BC_BASE_ADDR, TA_BC_BASE_ADDR_HI
+        new(0u, 61u, 0x1F2D8149u, [new(0x084u, 0x00000000u), new(0x085u, 0x20002000u)]), // PA_SC_CLIPRECT_0_TL, PA_SC_CLIPRECT_0_BR
+        new(0u, 62u, 0x853D0614u, [new(0x800003FFu, 0x00000000u)]), // CX_NOP
+        new(0u, 63u, 0x4413C6F9u, [new(0x008u, 0x00000000u), new(0x009u, 0x00000000u)]), // DB_DEPTH_BOUNDS_MIN, DB_DEPTH_BOUNDS_MAX
+        new(0u, 64u, 0x67096014u, [new(0x010u, 0x80000000u), new(0x011u, 0x20000000u), new(0x012u, 0x00000000u), new(0x013u, 0x00000000u), new(0x014u, 0x00000000u), new(0x015u, 0x00000000u), new(0x01Au, 0x00000000u), new(0x01Bu, 0x00000000u), new(0x01Cu, 0x00000000u), new(0x01Du, 0x00000000u), new(0x01Eu, 0x00000000u), new(0x002u, 0x00000000u), new(0x005u, 0x00000000u), new(0x007u, 0x00000000u), new(0x00Bu, 0x00000000u), new(0x00Au, 0x00000000u)]), // DB_Z_INFO, DB_STENCIL_INFO, DB_Z_READ_BASE, DB_STENCIL_READ_BASE, DB_Z_WRITE_BASE, DB_STENCIL_WRITE_BASE, DB_Z_READ_BASE_HI, DB_STENCIL_READ_BASE_HI, DB_Z_WRITE_BASE_HI, DB_STENCIL_WRITE_BASE_HI, DB_HTILE_DATA_BASE_HI, DB_DEPTH_VIEW, DB_HTILE_DATA_BASE, DB_DEPTH_SIZE_XY, DB_DEPTH_CLEAR, DB_STENCIL_CLEAR
+        new(0u, 65u, 0x88F5E915u, [new(0x0EBu, 0xFF00FF00u), new(0x0ECu, 0x00000000u)]), // PA_SC_FOV_WINDOW_LR, PA_SC_FOV_WINDOW_TB
+        new(0u, 66u, 0x033F1EFFu, [new(0x800003FCu, 0x00000000u), new(0x800003FDu, 0x00000000u)]), // FSR_RECURSIONS0, FSR_RECURSIONS1
+        new(0u, 67u, 0x918106BBu, [new(0x090u, 0x80000000u), new(0x091u, 0x40004000u)]), // PA_SC_GENERIC_SCISSOR_TL, PA_SC_GENERIC_SCISSOR_BR
+        new(0u, 68u, 0x95F0E7ACu, [new(0x2FAu, 0x4E7E0000u), new(0x2FBu, 0x4E7E0000u), new(0x2FCu, 0x4E7E0000u), new(0x2FDu, 0x4E7E0000u)]), // PA_CL_GB_VERT_CLIP_ADJ, PA_CL_GB_VERT_DISC_ADJ, PA_CL_GB_HORZ_CLIP_ADJ, PA_CL_GB_HORZ_DISC_ADJ
+        new(0u, 69u, 0xB48CBAB2u, [new(0x2E2u, 0x00000000u), new(0x2E3u, 0x00000000u)]), // PA_SU_POLY_OFFSET_BACK_SCALE, PA_SU_POLY_OFFSET_BACK_OFFSET
+        new(0u, 70u, 0x05BB3BC6u, [new(0x2E0u, 0x00000000u), new(0x2E1u, 0x00000000u)]), // PA_SU_POLY_OFFSET_FRONT_SCALE, PA_SU_POLY_OFFSET_FRONT_OFFSET
+        new(0u, 71u, 0x94FABA07u, [new(0x003u, 0x00000000u), new(0x004u, 0x00000000u)]), // DB_RENDER_OVERRIDE, DB_RENDER_OVERRIDE2
+        new(0u, 72u, 0x38E92C91u, [new(0x318u, 0x00000000u), new(0x31Bu, 0x00000000u), new(0x31Cu, 0x00000000u), new(0x31Du, 0x00000000u), new(0x31Eu, 0x00000048u), new(0x31Fu, 0x00000000u), new(0x321u, 0x00000000u), new(0x323u, 0x00000000u), new(0x324u, 0x00000000u), new(0x325u, 0x00000000u), new(0x390u, 0x00000000u), new(0x398u, 0x00000000u), new(0x3A0u, 0x00000000u), new(0x3A8u, 0x00000000u), new(0x3B0u, 0x00000000u), new(0x3B8u, 0x0006C000u)]), // CB_COLOR0_BASE, CB_COLOR0_VIEW, CB_COLOR0_INFO, CB_COLOR0_ATTRIB, CB_COLOR0_DCC_CONTROL, CB_COLOR0_CMASK, CB_COLOR0_FMASK, CB_COLOR0_CLEAR_WORD0, CB_COLOR0_CLEAR_WORD1, CB_COLOR0_DCC_BASE, CB_COLOR0_BASE_EXT, CB_COLOR0_CMASK_BASE_EXT, CB_COLOR0_FMASK_BASE_EXT, CB_COLOR0_DCC_BASE_EXT, CB_COLOR0_ATTRIB2, CB_COLOR0_ATTRIB3
+        new(0u, 73u, 0x0B177B43u, [new(0x00Cu, 0x00000000u), new(0x00Du, 0x40004000u)]), // PA_SC_SCREEN_SCISSOR_TL, PA_SC_SCREEN_SCISSOR_BR
+        new(0u, 74u, 0x48531062u, [new(0x191u, 0x00000000u)]), // SPI_PS_INPUT_CNTL_0
+        new(0u, 75u, 0xAAA964B9u, [new(0x16Fu, 0x00000000u), new(0x170u, 0x00000000u), new(0x171u, 0x00000000u), new(0x172u, 0x00000000u)]), // PA_CL_UCP_0_X, PA_CL_UCP_0_Y, PA_CL_UCP_0_Z, PA_CL_UCP_0_W
+        new(0u, 76u, 0x7690AF6Fu, [new(0x10Fu, 0x4E7E0000u), new(0x111u, 0x4E7E0000u), new(0x113u, 0x4E7E0000u), new(0x110u, 0x00000000u), new(0x112u, 0x00000000u), new(0x114u, 0x00000000u), new(0x094u, 0x80000000u), new(0x095u, 0x40004000u), new(0x0B4u, 0x00000000u), new(0x0B5u, 0x00000000u)]), // PA_CL_VPORT_XSCALE, PA_CL_VPORT_YSCALE, PA_CL_VPORT_ZSCALE, PA_CL_VPORT_XOFFSET, PA_CL_VPORT_YOFFSET, PA_CL_VPORT_ZOFFSET, PA_SC_VPORT_SCISSOR_0_TL, PA_SC_VPORT_SCISSOR_0_BR, PA_SC_VPORT_ZMIN_0, PA_SC_VPORT_ZMAX_0
+        new(0u, 77u, 0x078D7060u, [new(0x081u, 0x80000000u), new(0x082u, 0x40004000u)]), // PA_SC_WINDOW_SCISSOR_TL, PA_SC_WINDOW_SCISSOR_BR
+        // shader register groups
+        new(1u, 0u, 0x5D6E3EC7u, [new(0x212u, 0x00000000u)]), // COMPUTE_PGM_RSRC1
+        new(1u, 1u, 0x57E7079Au, [new(0x213u, 0x00000000u)]), // COMPUTE_PGM_RSRC2
+        new(1u, 2u, 0x7467FAFDu, [new(0x228u, 0x00000000u)]), // COMPUTE_PGM_RSRC3
+        new(1u, 3u, 0x9E826B50u, [new(0x215u, 0x00000000u)]), // COMPUTE_RESOURCE_LIMITS
+        new(1u, 4u, 0xDC484F18u, [new(0x218u, 0x00000000u)]), // COMPUTE_TMPRING_SIZE
+        new(1u, 5u, 0x5DA8BCA3u, [new(0x08Au, 0x00000000u)]), // SPI_SHADER_PGM_RSRC1_GS
+        new(1u, 6u, 0x5CA726D8u, [new(0x10Au, 0x00000000u)]), // SPI_SHADER_PGM_RSRC1_HS
+        new(1u, 7u, 0x5DD28360u, [new(0x00Au, 0x00000000u)]), // SPI_SHADER_PGM_RSRC1_PS
+        new(1u, 8u, 0x57EFA0BEu, [new(0x08Bu, 0x00000000u)]), // SPI_SHADER_PGM_RSRC2_GS
+        new(1u, 9u, 0x502363D5u, [new(0x10Bu, 0x00000000u)]), // SPI_SHADER_PGM_RSRC2_HS
+        new(1u, 10u, 0x506D14BDu, [new(0x00Bu, 0x00000000u)]), // SPI_SHADER_PGM_RSRC2_PS
+        new(1u, 11u, 0xB2609506u, [new(0x224u, 0x00000000u)]), // COMPUTE_USER_ACCUM_0
+        new(1u, 12u, 0x9E5CFB8Au, [new(0x107u, 0x00000000u), new(0x087u, 0x00000000u), new(0x007u, 0x00000000u)]), // SPI_SHADER_PGM_RSRC3_HS, SPI_SHADER_PGM_RSRC3_GS, SPI_SHADER_PGM_RSRC3_PS
+        new(1u, 13u, 0xC918DF3Eu, [new(0x20Cu, 0x00000000u), new(0x20Du, 0x00000000u)]), // COMPUTE_PGM_LO, COMPUTE_PGM_HI
+        new(1u, 14u, 0xC9751C9Cu, [new(0x0C8u, 0x00000000u), new(0x0C9u, 0x00000000u)]), // SPI_SHADER_PGM_LO_ES, SPI_SHADER_PGM_HI_ES
+        new(1u, 15u, 0xC97EF77Au, [new(0x088u, 0x00000000u), new(0x089u, 0x00000000u)]), // SPI_SHADER_PGM_LO_GS, SPI_SHADER_PGM_HI_GS
+        new(1u, 16u, 0xC927C6B9u, [new(0x108u, 0x00000000u), new(0x109u, 0x00000000u)]), // SPI_SHADER_PGM_LO_HS, SPI_SHADER_PGM_HI_HS
+        new(1u, 17u, 0xC92A1EC5u, [new(0x148u, 0x00000000u), new(0x149u, 0x00000000u)]), // SPI_SHADER_PGM_LO_LS, SPI_SHADER_PGM_HI_LS
+        new(1u, 18u, 0xC9E01B31u, [new(0x008u, 0x00000000u), new(0x009u, 0x00000000u)]), // SPI_SHADER_PGM_LO_PS, SPI_SHADER_PGM_HI_PS
+        new(1u, 19u, 0x50685F29u, [new(0x800002FFu, 0x00000000u)]), // SH_NOP
+        new(1u, 20u, 0xB26219CAu, [new(0x0B2u, 0x00000000u)]), // SPI_SHADER_USER_ACCUM_ESGS_0
+        new(1u, 21u, 0xB25B6CF9u, [new(0x132u, 0x00000000u)]), // SPI_SHADER_USER_ACCUM_LSHS_0
+        new(1u, 22u, 0xB2F86101u, [new(0x032u, 0x00000000u)]), // SPI_SHADER_USER_ACCUM_PS_0
+        new(1u, 23u, 0x07E3B155u, [new(0x082u, 0x00000000u), new(0x083u, 0x00000000u)]), // SPI_SHADER_USER_DATA_ADDR_LO_GS, SPI_SHADER_USER_DATA_ADDR_HI_GS
+        new(1u, 24u, 0x07E383C6u, [new(0x102u, 0x00000000u), new(0x103u, 0x00000000u)]), // SPI_SHADER_USER_DATA_ADDR_LO_HS, SPI_SHADER_USER_DATA_ADDR_HI_HS
+        new(1u, 25u, 0xBDA98653u, [new(0x240u, 0x00000000u)]), // COMPUTE_USER_DATA_0
+        new(1u, 26u, 0xBDBD1D0Fu, [new(0x08Cu, 0x00000000u)]), // SPI_SHADER_USER_DATA_GS_0
+        new(1u, 27u, 0xBD946FD4u, [new(0x10Cu, 0x00000000u)]), // SPI_SHADER_USER_DATA_HS_0
+        new(1u, 28u, 0xBDF02A4Cu, [new(0x00Cu, 0x00000000u)]), // SPI_SHADER_USER_DATA_PS_0
+        // uconfig register groups
+        new(2u, 0u, 0x19E93E85u, [new(0x41Fu, 0x00000000u)]), // GDS_OA_ADDRESS
+        new(2u, 1u, 0x3B5C2AF3u, [new(0x41Du, 0x00000000u)]), // GDS_OA_CNTL
+        new(2u, 2u, 0x47974A35u, [new(0x41Eu, 0x00000000u)]), // GDS_OA_COUNTER
+        new(2u, 3u, 0x105971C2u, [new(0x25Bu, 0x00000000u)]), // GE_CNTL
+        new(2u, 4u, 0x7D137765u, [new(0x24Au, 0x00000000u)]), // GE_INDX_OFFSET
+        new(2u, 5u, 0xD187FEBCu, [new(0x24Bu, 0x00000000u)]), // GE_MULTI_PRIM_IB_RESET_EN
+        new(2u, 6u, 0x12F854ACu, [new(0x25Fu, 0x00000000u)]), // GE_STEREO_CNTL
+        new(2u, 7u, 0x40D49AD1u, [new(0x262u, 0x00000000u)]), // GE_USER_VGPR_EN
+        new(2u, 8u, 0x8C0923DAu, [new(0x80003FF4u, 0x00000000u)]), // FSR_EXTEND_SUBPIXEL_ROUNDING
+        new(2u, 9u, 0xBB8DF494u, [new(0x80003FFDu, 0x00000000u)]), // TEXTURE_GRADIENT_CONTROL
+        new(2u, 10u, 0xF6D8A76Eu, [new(0x382u, 0x40000040u)]), // TEXTURE_GRADIENT_FACTORS
+        new(2u, 11u, 0x7620F1E9u, [new(0x248u, 0x00000000u)]), // VGT_OBJECT_ID
+        new(2u, 12u, 0x9EBFAB10u, [new(0x242u, 0x00000000u)]), // VGT_PRIMITIVE_TYPE
+        new(2u, 13u, 0x98A09D0Eu, [new(0x380u, 0x00000000u), new(0x381u, 0x00000000u)]), // TA_CS_BC_BASE_ADDR, TA_CS_BC_BASE_ADDR_HI
+        new(2u, 14u, 0x195D37D2u, [new(0x80003FF5u, 0x00000000u), new(0x80003FF6u, 0x00000000u)]), // FSR_ALPHA_VALUE0, FSR_ALPHA_VALUE1
+        new(2u, 15u, 0xF9EC4F85u, [new(0x80003FF7u, 0x00000000u), new(0x80003FF8u, 0x00000000u), new(0x80003FF9u, 0x00000000u), new(0x80003FFAu, 0x00000000u)]), // FSR_CONTROL_POINT0, FSR_CONTROL_POINT1, FSR_CONTROL_POINT2, FSR_CONTROL_POINT3
+        new(2u, 16u, 0x4626B750u, [new(0x80003FFBu, 0x00000000u), new(0x80003FFCu, 0x00000000u)]), // FSR_WINDOW0, FSR_WINDOW1
+        new(2u, 17u, 0x4CC673A0u, [new(0x80003FFEu, 0x00000000u)]), // MEMORY_MAPPING_MASK
+        new(2u, 18u, 0xDE5B3431u, [new(0x80003FFFu, 0x00000000u)]), // UC_NOP
+        new(2u, 19u, 0x036AC8A6u, [new(0x25Cu, 0x00000000u)]), // GE_USER_VGPR1
+    ];
+}

src/SharpEmu.Libs/Agc/AgcShaderCompilerHooks.cs

@@ -4,6 +4,7 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;
 using SharpEmu.Libs.Kernel;
+using SharpEmu.Libs.VideoOut;
 using SharpEmu.ShaderCompiler;
 
 namespace SharpEmu.Libs.Agc;
@@ -26,5 +27,7 @@ internal static class AgcShaderCompilerHooks
     {
         Gen5ShaderScalarEvaluator.FallbackMemoryReader =
             KernelMemoryCompatExports.TryReadTrackedLibcHeap;
+        Gen5ShaderScalarEvaluator.GlobalMemoryPool =
+            VulkanVideoPresenter.GuestDataPool;
     }
 }

src/SharpEmu.Libs/Agc/GnmTiling.cs

@@ -0,0 +1,486 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+namespace SharpEmu.Libs.Agc;
+
+/// <summary>
+/// Deswizzles RDNA2 (GFX10) tiled texture surfaces into linear layout so they
+/// can be uploaded to Vulkan. PS5 stores most textures in a swizzled layout
+/// selected by the 5-bit SWIZZLE_MODE in the image descriptor; uploading those
+/// bytes verbatim samples as garbage.
+///
+/// The GFX10 addressing uses power-of-two swizzle blocks (256 B / 4 KiB /
+/// 64 KiB) whose internal element order follows the standard (S), display (D),
+/// render (R), or z-order/depth (Z) equations. This implements the exact base
+/// S and Z 2D single-sample modes plus the PS5's RB+ 64 KiB Z_X/R_X equations;
+/// other D/R and pipe/bank-XOR modes stay opt-in while their complete AddrLib
+/// equations are being ported.
+/// </summary>
+internal static class GnmTiling
+{
+    // Oberon uses the 16-pipe / 8-pixel-packer RB+ topology. These are the
+    // single-sample 64 KiB equations generated by AMD AddrLib for that exact
+    // topology. Each entry describes one address bit as an XOR of X/Y bits.
+    private readonly record struct AddressBit(uint XMask, uint YMask);
+
+    private static readonly AddressBit[][] RbPlus64KRenderX =
+    [
+        // 1 byte/element: nibble01=0, nibble2=307, nibble3=379.
+        [X(0), X(1), X(2), X(3), Y(0), Y(1), Y(2), Y(3),
+         XY(7, 4, 7), XY(4, 4), XY(6, 5), XY(5, 6),
+         X(6), Y(6), XY(7, 8), XY(8, 7)],
+        // 2 bytes/element: nibble01=1, nibble2=307, nibble3=389.
+        [Zero, X(0), X(1), X(2), Y(0), Y(1), Y(2), X(3),
+         XY(7, 4, 7), XY(4, 4), XY(6, 5), XY(5, 6),
+         Y(3), X(6), XY(7, 7), XY(8, 6)],
+        // 4 bytes/element: nibble01=39, nibble2=307, nibble3=381.
+        [Zero, Zero, X(0), X(1), Y(0), Y(1), X(2), Y(2),
+         XY(7, 4, 7), XY(4, 4), XY(6, 5), XY(5, 6),
+         X(3), Y(3), XY(6, 7), XY(7, 6)],
+        // 8 bytes/element: nibble01=6, nibble2=307, nibble3=382.
+        [Zero, Zero, Zero, X(0), Y(0), X(1), X(2), Y(1),
+         XY(7, 4, 7), XY(4, 4), XY(6, 5), XY(5, 6),
+         Y(2), X(3), XY(7, 3), XY(6, 6)],
+        // 16 bytes/element: nibble01=7, nibble2=307, nibble3=390.
+        [Zero, Zero, Zero, Zero, X(0), Y(0), X(1), Y(1),
+         XY(7, 4, 7), XY(4, 4), XY(6, 5), XY(5, 6),
+         X(2), Y(2), XY(6, 3), XY(3, 6)],
+    ];
+
+    private static readonly AddressBit[][] RbPlus64KDepthX =
+    [
+        // 1 byte/element: nibble01=8, nibble2=306, nibble3=379.
+        [X(0), Y(0), X(1), Y(1), X(2), Y(2), X(3), Y(3),
+         XY(7, 4, 7), XY(4, 4), XY(6, 5), XY(5, 6),
+         X(6), Y(6), XY(7, 8), XY(8, 7)],
+        // 2 bytes/element: nibble01=9, nibble2=306, nibble3=389.
+        [Zero, X(0), Y(0), X(1), Y(1), X(2), Y(2), X(3),
+         XY(7, 4, 7), XY(4, 4), XY(6, 5), XY(5, 6),
+         Y(3), X(6), XY(7, 7), XY(8, 6)],
+        // 4 bytes/element: nibble01=10, nibble2=306, nibble3=381.
+        [Zero, Zero, X(0), Y(0), X(1), Y(1), X(2), Y(2),
+         XY(7, 4, 7), XY(4, 4), XY(6, 5), XY(5, 6),
+         X(3), Y(3), XY(6, 7), XY(7, 6)],
+        // 8 bytes/element: nibble01=11, nibble2=307, nibble3=382.
+        [Zero, Zero, Zero, X(0), Y(0), X(1), Y(1), X(2),
+         XY(7, 4, 7), XY(4, 4), XY(6, 5), XY(5, 6),
+         Y(2), X(3), XY(7, 3), XY(6, 6)],
+        // 16 bytes/element is identical to R_X for a 2D single-sample image.
+        [Zero, Zero, Zero, Zero, X(0), Y(0), X(1), Y(1),
+         XY(7, 4, 7), XY(4, 4), XY(6, 5), XY(5, 6),
+         X(2), Y(2), XY(6, 3), XY(3, 6)],
+    ];
+
+    private static readonly AddressBit[][] RbPlus64KStandard =
+    [
+        // GFX10_SW_64K_S_RBPLUS_PATINFO, 1 byte/element.
+        [X(0), X(1), X(2), X(3), Y(0), Y(1), Y(2), Y(3),
+         Y(4), X(4), Y(5), X(5), Y(6), X(6), Y(7), X(7)],
+        // 2 bytes/element.
+        [Zero, X(0), X(1), X(2), Y(0), Y(1), Y(2), X(3),
+         Y(3), X(4), Y(4), X(5), Y(5), X(6), Y(6), X(7)],
+        // 4 bytes/element.
+        [Zero, Zero, X(0), X(1), Y(0), Y(1), Y(2), X(2),
+         Y(3), X(3), Y(4), X(4), Y(5), X(5), Y(6), X(6)],
+        // 8 bytes/element (also BC1/BC4 compressed blocks).
+        [Zero, Zero, Zero, X(0), Y(0), Y(1), X(1), X(2),
+         Y(2), X(3), Y(3), X(4), Y(4), X(5), Y(5), X(6)],
+        // 16 bytes/element (also 16-byte BC compressed blocks).
+        [Zero, Zero, Zero, Zero, Y(0), Y(1), X(0), X(1),
+         Y(2), X(2), Y(3), X(3), Y(4), X(4), Y(5), X(5)],
+    ];
+
+    // GFX10 4K_S has a separate 12-bit micro-tile equation. It is not the
+    // generic x/y interleave used by the 64K standard block; using that larger
+    // equation leaves a regular grid in linearized atlases.
+    private static readonly AddressBit[][] Standard4K =
+    [
+        [X(0), X(1), X(2), X(3), Y(0), Y(1), Y(2), Y(3),
+         Y(4), X(4), Y(5), X(5)],
+        [Zero, X(0), X(1), X(2), Y(0), Y(1), Y(2), X(3),
+         Y(3), X(4), Y(4), X(5)],
+        [Zero, Zero, X(0), X(1), Y(0), Y(1), Y(2), X(2),
+         Y(3), X(3), Y(4), X(4)],
+        [Zero, Zero, Zero, X(0), Y(0), Y(1), X(1), X(2),
+         Y(2), X(3), Y(3), X(4)],
+        [Zero, Zero, Zero, Zero, Y(0), Y(1), X(0), X(1),
+         Y(2), X(2), Y(3), X(3)],
+    ];
+
+    private static readonly bool _enabled = string.Equals(
+        Environment.GetEnvironmentVariable("SHARPEMU_DETILE"),
+        "1",
+        StringComparison.Ordinal);
+
+    private static readonly bool _disabled = string.Equals(
+        Environment.GetEnvironmentVariable("SHARPEMU_DETILE"),
+        "0",
+        StringComparison.Ordinal);
+
+    private static readonly HashSet<uint> _reportedModes = new();
+
+    public static bool Enabled => _enabled || !_disabled;
+
+    /// <summary>
+    /// Base S/Z modes and the Oberon RB+ 64 KiB Z_X/R_X modes for which this
+    /// implementation carries the exact AddrLib address equations. Other
+    /// bank/pipe-XOR variants remain opt-in.
+    /// </summary>
+    private static bool IsTrustedByDefault(uint swizzleMode) =>
+        // Exact base S/Z modes. D/R use different GFX10 swizzle equations and
+        // the T/X modes additionally apply pipe/bank XOR between blocks.
+        swizzleMode is 1 or 4 or 5 or 8 or 9 or 24 or 27;
+
+    // Detile a surface when it is verified-correct by default (trusted base mode),
+    // or when the user opts the approximate modes in with SHARPEMU_DETILE=1.
+    // SHARPEMU_DETILE=0 forces the old raw-upload behavior for everything.
+    private static bool ShouldDetile(uint swizzleMode) =>
+        swizzleMode != 0 && !_disabled && (_enabled || IsTrustedByDefault(swizzleMode));
+
+    /// <summary>
+    /// True when a surface with the given swizzle mode needs deswizzling.
+    /// Mode 0 is linear and never needs it.
+    /// </summary>
+    public static bool NeedsDetile(uint swizzleMode) => ShouldDetile(swizzleMode);
+
+    /// <summary>
+    /// Gets the physical byte span occupied by a tiled mip. GNM allocates whole
+    /// swizzle blocks even when the logical image is much smaller than a block;
+    /// reading only the logical texel count truncates most source offsets during
+    /// detiling (a 64x64 BC1 mode-9 image is 2 KiB logically but occupies one
+    /// 64 KiB swizzle block).
+    /// </summary>
+    public static bool TryGetTiledByteCount(
+        uint swizzleMode,
+        int elementsWide,
+        int elementsHigh,
+        int bytesPerElement,
+        out ulong byteCount)
+    {
+        byteCount = 0;
+        if (!ShouldDetile(swizzleMode) ||
+            elementsWide <= 0 ||
+            elementsHigh <= 0 ||
+            bytesPerElement <= 0 ||
+            !TryGetSwizzleKind(swizzleMode, out _, out var blockBytes))
+        {
+            return false;
+        }
+
+        var bppLog2 = BitLog2((uint)bytesPerElement);
+        if (bppLog2 < 0)
+        {
+            return false;
+        }
+
+        var blockElements = blockBytes >> bppLog2;
+        var (blockWidth, blockHeight) = SquareBlockDimensions(blockElements);
+        if (blockWidth == 0 || blockHeight == 0)
+        {
+            return false;
+        }
+
+        var blocksWide = ((ulong)elementsWide + (ulong)blockWidth - 1) / (ulong)blockWidth;
+        var blocksHigh = ((ulong)elementsHigh + (ulong)blockHeight - 1) / (ulong)blockHeight;
+        try
+        {
+            byteCount = checked(blocksWide * blocksHigh * (ulong)blockBytes);
+            return true;
+        }
+        catch (OverflowException)
+        {
+            byteCount = 0;
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// Deswizzles <paramref name="tiled"/> into linear row-major order.
+    /// Elements are pixels for uncompressed formats and 4x4 blocks for
+    /// block-compressed formats, so callers pass the element grid dimensions
+    /// and the bytes per element. Returns false (leaving output untouched) for
+    /// unsupported swizzle modes so the caller can fall back to the raw bytes.
+    /// </summary>
+    public static bool TryDetile(
+        ReadOnlySpan<byte> tiled,
+        Span<byte> linear,
+        uint swizzleMode,
+        int elementsWide,
+        int elementsHigh,
+        int bytesPerElement)
+    {
+        if (!ShouldDetile(swizzleMode) || elementsWide <= 0 || elementsHigh <= 0 || bytesPerElement <= 0)
+        {
+            return false;
+        }
+
+        if (!TryGetSwizzleKind(swizzleMode, out var kind, out var blockBytes))
+        {
+            ReportUnsupported(swizzleMode);
+            return false;
+        }
+
+        var bppLog2 = BitLog2((uint)bytesPerElement);
+        if (bppLog2 < 0)
+        {
+            // Non-power-of-two element size (e.g. 24-bit) is not swizzled in a
+            // way this equation models.
+            ReportUnsupported(swizzleMode);
+            return false;
+        }
+
+        // Block dimensions in elements: a swizzle block holds blockBytes bytes,
+        // laid out as a square-ish power-of-two element grid scaled by bpp.
+        var blockElements = blockBytes >> bppLog2;
+        var (blockWidth, blockHeight) = SquareBlockDimensions(blockElements);
+        if (blockWidth == 0 || blockHeight == 0)
+        {
+            ReportUnsupported(swizzleMode);
+            return false;
+        }
+
+        var blocksPerRow = (elementsWide + blockWidth - 1) / blockWidth;
+        var requiredLinear = (long)elementsWide * elementsHigh * bytesPerElement;
+        if (linear.Length < requiredLinear)
+        {
+            return false;
+        }
+
+        // Precompute the within-block element offset for each (x, y) inside a
+        // single block. The swizzle equation only depends on the in-block
+        // coordinates, so this table is reused for every block — turning the
+        // per-pixel bit-interleave (a loop + calls) into a single array lookup.
+        // Detiling a 2048x2048 texture is millions of elements; without this the
+        // per-pixel math makes DETILE unusably slow during asset streaming.
+        var hasExactXorPattern = TryGetExactXorPattern(swizzleMode, bppLog2, out var xorPattern);
+        var blockTable = hasExactXorPattern ? [] : new int[blockWidth * blockHeight];
+        for (var by = 0; !hasExactXorPattern && by < blockHeight; by++)
+        {
+            for (var bx = 0; bx < blockWidth; bx++)
+            {
+                blockTable[by * blockWidth + bx] = (int)(kind == SwizzleKind.ZOrder
+                    ? MortonInterleave((uint)bx, (uint)by, blockWidth, blockHeight)
+                    : StandardSwizzleOffset((uint)bx, (uint)by, blockWidth, blockHeight));
+            }
+        }
+
+        for (var y = 0; y < elementsHigh; y++)
+        {
+            var blockY = y / blockHeight;
+            var inBlockY = y % blockHeight;
+            var rowBlockBase = (long)blockY * blocksPerRow;
+            var tableRowBase = inBlockY * blockWidth;
+            var destRowBase = (long)y * elementsWide * bytesPerElement;
+            for (var x = 0; x < elementsWide; x++)
+            {
+                var blockX = x / blockWidth;
+                var inBlockX = x % blockWidth;
+
+                var blockIndex = rowBlockBase + blockX;
+                var sourceByte = hasExactXorPattern
+                    ? blockIndex * blockBytes + ComputePatternOffset((uint)x, (uint)y, xorPattern)
+                    : (blockIndex * blockElements + blockTable[tableRowBase + inBlockX]) *
+                      (long)bytesPerElement;
+                var destByte = destRowBase + (long)x * bytesPerElement;
+                if (sourceByte + bytesPerElement > tiled.Length ||
+                    destByte + bytesPerElement > linear.Length)
+                {
+                    continue;
+                }
+
+                tiled.Slice((int)sourceByte, bytesPerElement)
+                    .CopyTo(linear.Slice((int)destByte, bytesPerElement));
+            }
+        }
+
+        return true;
+    }
+
+    private enum SwizzleKind
+    {
+        Standard,
+        ZOrder,
+    }
+
+    private static readonly AddressBit Zero = new(0, 0);
+
+    private static AddressBit X(int bit) => new(1u << bit, 0);
+
+    private static AddressBit Y(int bit) => new(0, 1u << bit);
+
+    private static AddressBit XY(int xBit, int yBit) => new(1u << xBit, 1u << yBit);
+
+    private static AddressBit XY(int xBit, int yBit1, int yBit2) =>
+        new(1u << xBit, (1u << yBit1) | (1u << yBit2));
+
+    private static bool TryGetExactXorPattern(
+        uint swizzleMode,
+        int bytesPerElementLog2,
+        out AddressBit[] pattern)
+    {
+        pattern = [];
+        if ((uint)bytesPerElementLog2 >= RbPlus64KRenderX.Length)
+        {
+            return false;
+        }
+
+        pattern = swizzleMode switch
+        {
+            5 => Standard4K[bytesPerElementLog2],
+            9 => RbPlus64KStandard[bytesPerElementLog2],
+            24 => RbPlus64KDepthX[bytesPerElementLog2],
+            27 => RbPlus64KRenderX[bytesPerElementLog2],
+            _ => [],
+        };
+        return pattern.Length != 0;
+    }
+
+    private static long ComputePatternOffset(uint x, uint y, AddressBit[] pattern)
+    {
+        uint offset = 0;
+        for (var bit = 0; bit < pattern.Length; bit++)
+        {
+            var equation = pattern[bit];
+            var parity = (System.Numerics.BitOperations.PopCount(x & equation.XMask) +
+                          System.Numerics.BitOperations.PopCount(y & equation.YMask)) & 1;
+            offset |= (uint)parity << bit;
+        }
+
+        return offset;
+    }
+
+    private static bool TryGetSwizzleKind(uint swizzleMode, out SwizzleKind kind, out int blockBytes)
+    {
+        // GFX10 AddrLib SWIZZLE_MODE enumeration:
+        //   1-3   = 256 B S/D/R
+        //   4-7   = 4 KiB Z/S/D/R
+        //   8-11  = 64 KiB Z/S/D/R
+        //   16-19 = 64 KiB Z/S/D/R _T
+        //   20-23 = 4 KiB Z/S/D/R _X
+        //   24-27 = 64 KiB Z/S/D/R _X
+        // The pipe/bank XOR (_T/_X) affects which block a given tile lands in,
+        // but the *within-block* element order matches the base S/Z equation,
+        // which is what dominates visible correctness. We model the block
+        // interior and treat blocks as linear-ordered.
+        kind = SwizzleKind.Standard;
+        blockBytes = 0;
+        switch (swizzleMode)
+        {
+            case 4: case 8: case 16: case 20: case 24:
+                kind = SwizzleKind.ZOrder;
+                break;
+            case 1: case 2: case 3:
+            case 5: case 6: case 7:
+            case 9: case 10: case 11:
+            case 17: case 18: case 19:
+            case 21: case 22: case 23:
+            case 25: case 26: case 27:
+                kind = SwizzleKind.Standard;
+                break;
+            default:
+                return false;
+        }
+
+        blockBytes = swizzleMode switch
+        {
+            >= 1 and <= 3 => 256,
+            >= 4 and <= 7 => 4096,
+            >= 20 and <= 23 => 4096,
+            _ => 65536,
+        };
+        return true;
+    }
+
+    // Standard (S) 2D swizzle: within a block, the element order interleaves x
+    // and y bits with x taking the low bit — the AMD "standard" microtile.
+    private static long StandardSwizzleOffset(uint x, uint y, int blockWidth, int blockHeight)
+    {
+        var widthBits = BitLog2((uint)blockWidth);
+        var heightBits = BitLog2((uint)blockHeight);
+        long offset = 0;
+        var outBit = 0;
+        var xi = 0;
+        var yi = 0;
+        while (xi < widthBits || yi < heightBits)
+        {
+            if (xi < widthBits)
+            {
+                offset |= (long)((x >> xi) & 1u) << outBit++;
+                xi++;
+            }
+
+            if (yi < heightBits)
+            {
+                offset |= (long)((y >> yi) & 1u) << outBit++;
+                yi++;
+            }
+        }
+
+        return offset;
+    }
+
+    // Z-order (Morton) swizzle: pure bit interleave, y taking the low bit.
+    private static long MortonInterleave(uint x, uint y, int blockWidth, int blockHeight)
+    {
+        var widthBits = BitLog2((uint)blockWidth);
+        var heightBits = BitLog2((uint)blockHeight);
+        long offset = 0;
+        var outBit = 0;
+        var xi = 0;
+        var yi = 0;
+        while (xi < widthBits || yi < heightBits)
+        {
+            if (yi < heightBits)
+            {
+                offset |= (long)((y >> yi) & 1u) << outBit++;
+                yi++;
+            }
+
+            if (xi < widthBits)
+            {
+                offset |= (long)((x >> xi) & 1u) << outBit++;
+                xi++;
+            }
+        }
+
+        return offset;
+    }
+
+    private static (int Width, int Height) SquareBlockDimensions(int blockElements)
+    {
+        if (blockElements <= 0 || (blockElements & (blockElements - 1)) != 0)
+        {
+            return (0, 0);
+        }
+
+        var totalBits = BitLog2((uint)blockElements);
+        // Split as evenly as possible with width >= height (x gets the extra bit).
+        var widthBits = (totalBits + 1) / 2;
+        var heightBits = totalBits - widthBits;
+        return (1 << widthBits, 1 << heightBits);
+    }
+
+    private static int BitLog2(uint value)
+    {
+        if (value == 0 || (value & (value - 1)) != 0)
+        {
+            return -1;
+        }
+
+        return System.Numerics.BitOperations.TrailingZeroCount(value);
+    }
+
+    private static void ReportUnsupported(uint swizzleMode)
+    {
+        lock (_reportedModes)
+        {
+            if (!_reportedModes.Add(swizzleMode))
+            {
+                return;
+            }
+        }
+
+        Console.Error.WriteLine(
+            $"[LOADER][WARN] GNM detile: unsupported swizzle mode {swizzleMode}; texture uploaded linear.");
+    }
+}

src/SharpEmu.Libs/Agc/GpuWaitRegistry.cs

@@ -3,10 +3,17 @@
 
 namespace SharpEmu.Libs.Agc;
 
-// Holds DCBs whose parsing was suspended on an unsatisfied WAIT_REG_MEM condition.
-// AgcExports re-checks every waiter against guest memory on each submit and resumes
-// the ones whose condition became true (labels are advanced by ReleaseMem/WriteData/
-// DmaData packets or by direct CPU writes).
+/// <summary>
+/// Holds DCBs whose parsing was suspended on an unsatisfied WAIT_REG_MEM
+/// condition. AgcExports re-checks every waiter against guest memory on each
+/// submit and resumes the ones whose condition became true (labels are advanced
+/// by ReleaseMem / WriteData / DmaData packets, or by direct CPU writes).
+///
+/// This preserves cross-submit ordering: the work that follows a wait inside a
+/// DCB is only queued once the awaited completion label is genuinely written,
+/// instead of being force-satisfied at parse time and running ahead of the
+/// compute/graphics work it depends on (which produced a black composite).
+/// </summary>
 internal static class GpuWaitRegistry
 {
     public struct WaitingDcb
@@ -19,13 +26,56 @@ internal static class GpuWaitRegistry
         public ulong ReferenceValue;
         public ulong Mask;
         public uint CompareFunction;
+        public uint ControlValue;
         public bool Is64Bit;
+        public bool IsStandard;
+        public object? Memory;
+        public string? QueueName;
+        public ulong SubmissionId;
+        // Stopwatch timestamp captured at registration. Stale waiters remain
+        // registered; this only controls one-shot diagnostics.
+        public long RegisteredTicks;
+        public bool StaleReported;
         public object? State;
     }
 
     private static readonly object _gate = new();
     private static readonly Dictionary<ulong, List<WaitingDcb>> _waiters = new();
 
+    public static int Count
+    {
+        get
+        {
+            lock (_gate)
+            {
+                var total = 0;
+                foreach (var (_, list) in _waiters)
+                {
+                    total += list.Count;
+                }
+
+                return total;
+            }
+        }
+    }
+
+    public static int CountForMemory(object memory)
+    {
+        lock (_gate)
+        {
+            var total = 0;
+            foreach (var (_, list) in _waiters)
+            {
+                foreach (var waiter in list)
+                {
+                    total += ReferenceEquals(waiter.Memory, memory) ? 1 : 0;
+                }
+            }
+
+            return total;
+        }
+    }
+
     public static void Register(ulong address, WaitingDcb waiter)
     {
         waiter.WaitAddress = address;
@@ -41,9 +91,15 @@ internal static class GpuWaitRegistry
         }
     }
 
-    // Re-evaluates every registered waiter. readValue receives (address, is64Bit) and
-    // returns null when the memory is unreadable; such waiters are kept registered.
-    public static List<WaitingDcb>? CollectSatisfied(Func<ulong, bool, ulong?> readValue)
+    /// <summary>
+    /// Re-evaluates every registered waiter. <paramref name="readValue"/>
+    /// receives (address, is64Bit) and returns null when the memory is
+    /// unreadable; such waiters are kept registered. Returns the waiters whose
+    /// condition is now satisfied (removed from the registry), or null.
+    /// </summary>
+    public static List<WaitingDcb>? CollectSatisfied(
+        object memory,
+        Func<ulong, bool, ulong?> readValue)
     {
         List<WaitingDcb>? woken = null;
         lock (_gate)
@@ -53,6 +109,11 @@ internal static class GpuWaitRegistry
             {
                 for (var i = list.Count - 1; i >= 0; i--)
                 {
+                    if (!ReferenceEquals(list[i].Memory, memory))
+                    {
+                        continue;
+                    }
+
                     var value = readValue(address, list[i].Is64Bit);
                     if (value is null || !Compare(list[i], value.Value))
                     {
@@ -71,7 +132,7 @@ internal static class GpuWaitRegistry
                 }
             }
 
-            if (emptied != null)
+            if (emptied is not null)
             {
                 foreach (var address in emptied)
                 {
@@ -83,20 +144,122 @@ internal static class GpuWaitRegistry
         return woken;
     }
 
+    /// <summary>
+    /// Returns waiters that have remained unsatisfied longer than
+    /// <paramref name="maxAgeTicks"/> exactly once, without removing them or
+    /// changing their labels. Missing GPU work must fail closed: advancing a
+    /// command buffer without its real producer corrupts cross-queue ordering.
+    /// </summary>
+    public static List<WaitingDcb>? CollectUnreportedStale(
+        object memory,
+        long nowTicks,
+        long maxAgeTicks)
+    {
+        List<WaitingDcb>? stale = null;
+        lock (_gate)
+        {
+            foreach (var (_, list) in _waiters)
+            {
+                for (var i = list.Count - 1; i >= 0; i--)
+                {
+                    var waiter = list[i];
+                    if (!ReferenceEquals(waiter.Memory, memory) ||
+                        waiter.StaleReported ||
+                        nowTicks - waiter.RegisteredTicks < maxAgeTicks)
+                    {
+                        continue;
+                    }
+
+                    stale ??= new List<WaitingDcb>();
+                    waiter.StaleReported = true;
+                    list[i] = waiter;
+                    stale.Add(waiter);
+                }
+            }
+        }
+
+        return stale;
+    }
+
+    /// <summary>
+    /// Returns watched labels overlapped by a newly discovered producer. Used
+    /// only for diagnostics; producer completion still wakes through the
+    /// normal CollectSatisfied path after the ordered memory write executes.
+    /// </summary>
+    public static List<(ulong Address, int Count)> SnapshotInRange(
+        object memory,
+        ulong start,
+        ulong length)
+    {
+        var matches = new List<(ulong Address, int Count)>();
+        if (length == 0)
+        {
+            return matches;
+        }
+
+        var end = start > ulong.MaxValue - length ? ulong.MaxValue : start + length;
+        lock (_gate)
+        {
+            foreach (var (address, list) in _waiters)
+            {
+                var matchingCount = 0;
+                var any64Bit = false;
+                foreach (var waiter in list)
+                {
+                    if (!ReferenceEquals(waiter.Memory, memory))
+                    {
+                        continue;
+                    }
+
+                    matchingCount++;
+                    any64Bit |= waiter.Is64Bit;
+                }
+
+                if (matchingCount == 0)
+                {
+                    continue;
+                }
+
+                var width = any64Bit
+                    ? sizeof(ulong)
+                    : sizeof(uint);
+                var waitEnd = address > ulong.MaxValue - (ulong)width
+                    ? ulong.MaxValue
+                    : address + (ulong)width;
+                if (start < waitEnd && address < end)
+                {
+                    matches.Add((address, matchingCount));
+                }
+            }
+        }
+
+        return matches;
+    }
+
     public static bool Compare(in WaitingDcb waiter, ulong value)
     {
         var masked = value & waiter.Mask;
+        var reference = waiter.ReferenceValue & waiter.Mask;
         return waiter.CompareFunction switch
         {
-            1 => masked < waiter.ReferenceValue,
-            2 => masked <= waiter.ReferenceValue,
-            3 => masked == waiter.ReferenceValue,
-            4 => masked != waiter.ReferenceValue,
-            5 => masked >= waiter.ReferenceValue,
-            6 => masked > waiter.ReferenceValue,
-            // 0 is "always" in the PM4 encoding and 7 is reserved; treating both as
-            // satisfied keeps a malformed packet from suspending its DCB forever.
+            0 => true,
+            1 => masked < reference,
+            2 => masked <= reference,
+            3 => masked == reference,
+            4 => masked != reference,
+            5 => masked >= reference,
+            6 => masked > reference,
+            // 7 is reserved; treating it as satisfied keeps a malformed packet
+            // from suspending forever.
             _ => true,
         };
     }
+
+    public static void Clear()
+    {
+        lock (_gate)
+        {
+            _waiters.Clear();
+        }
+    }
 }

src/SharpEmu.Libs/Ajm/AjmExports.cs

@@ -7,31 +7,11 @@ namespace SharpEmu.Libs.Ajm;
 
 public static class AjmExports
 {
-    private const int OrbisAjmErrorInvalidParameter = unchecked((int)0x80930005);
-    private static int _nextContextId;
-
     [SysAbiExport(
         Nid = "dl+4eHSzUu4",
         ExportName = "sceAjmInitialize",
         Target = Generation.Gen4 | Generation.Gen5,
         LibraryName = "libSceAjm")]
-    public static int Initialize(CpuContext ctx)
-    {
-        var reserved = ctx[CpuRegister.Rdi];
-        var outContextAddress = ctx[CpuRegister.Rsi];
-
-        // AJM requires a zero reserved argument.
-        if (reserved != 0 || outContextAddress == 0)
-        {
-            return ctx.SetReturn(OrbisAjmErrorInvalidParameter);
-        }
-
-        var contextId = unchecked((uint)Interlocked.Increment(ref _nextContextId));
-        if (!ctx.TryWriteUInt32(outContextAddress, contextId))
-        {
-            return ctx.SetReturn(OrbisAjmErrorInvalidParameter);
-        }
-
-        return ctx.SetReturn(0);
-    }
+    public static int Initialize(CpuContext ctx) =>
+        SharpEmu.Libs.Audio.AjmExports.AjmInitialize(ctx);
 }

src/SharpEmu.Libs/Ampr/AmprExports.cs

@@ -36,6 +36,7 @@ public static class AmprExports
         public ulong Buffer;
         public ulong Size;
         public ulong WriteOffset;
+        public ulong CommandCount;
     }
 
     private sealed class CachedHostFile
@@ -267,53 +268,19 @@ public static class AmprExports
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
         }
 
-        ulong bytesRead = 0;
-
-        // Unregistered/missing files are zero-filled instead of failing: games queue
-        // speculative reads and only consume the bytes on success paths.
-        if (!AmprFileRegistry.TryGetHostPath(fileId, out var hostPath) || !File.Exists(hostPath))
+        if (!AmprFileRegistry.TryGetHostPath(fileId, out var hostPath))
         {
-            if (destination != 0 && size > 0)
-            {
-                int chunkSize = (int)Math.Min(size, 4096);
-                Span<byte> zeros = stackalloc byte[chunkSize];
-                zeros.Clear();
-                while (bytesRead < size)
-                {
-                    int currentChunk = (int)Math.Min((ulong)chunkSize, size - bytesRead);
-                    if (!ctx.Memory.TryWrite(destination + bytesRead, zeros[..currentChunk]))
-                    {
-                        break;
-                    }
-
-                    bytesRead += (ulong)currentChunk;
-                }
-            }
-
-            TraceAmprRead(ctx, commandBuffer, fileId, destination, size, fileOffset, bytesRead, "(missing)", (int)OrbisGen2Result.ORBIS_GEN2_OK);
-            ctx[CpuRegister.Rax] = 0;
-            return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+            TraceAmprRead(ctx, commandBuffer, fileId, destination, size, fileOffset, bytesRead: 0, hostPath, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND;
         }
 
-        // Offset -1 means "continue after the previous read of this file id".
-        if (fileOffset == unchecked((ulong)(long)-1))
-        {
-            fileOffset = PakDirectoryTracker.ResolveSequentialOffset(fileId, size);
-        }
-        else if (fileOffset > long.MaxValue)
-        {
-            fileOffset = 0;
-        }
-
-        var result = TryReadFileToGuestMemory(ctx, hostPath, fileOffset, destination, size, out bytesRead);
+        var result = TryReadFileToGuestMemory(ctx, hostPath, fileOffset, destination, size, out var bytesRead);
         if (result != (int)OrbisGen2Result.ORBIS_GEN2_OK)
         {
             TraceAmprRead(ctx, commandBuffer, fileId, destination, size, fileOffset, bytesRead, hostPath, result);
             return result;
         }
 
-        PakDirectoryTracker.OnReadCompleted(ctx, fileId, destination, fileOffset, bytesRead);
-
         if (!AppendReadFileRecord(ctx, commandBuffer, fileId, destination, size, fileOffset, bytesRead))
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
@@ -418,6 +385,35 @@ public static class AmprExports
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
 
+    [SysAbiExport(
+        Nid = "gzndltBEzWc",
+        ExportName = "sceAmprCommandBufferGetNumCommands",
+        Target = Generation.Gen5,
+        LibraryName = "libSceAmpr")]
+    public static int CommandBufferGetNumCommands(CpuContext ctx)
+    {
+        var commandBuffer = ctx[CpuRegister.Rdi];
+        if (commandBuffer == 0)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        if (!TryGetCommandBufferState(ctx, commandBuffer, out _, out _, out var state) || state is null)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
+        }
+
+        ulong commandCount;
+        lock (state)
+        {
+            commandCount = state.CommandCount;
+        }
+
+        TraceAmpr(ctx, "get_num_commands", commandBuffer, commandCount, 0);
+        ctx[CpuRegister.Rax] = commandCount;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
     [SysAbiExport(
         Nid = "H896Pt-yB4I",
         ExportName = "sceAmprCommandBufferWriteKernelEventQueue_04_00",
@@ -533,7 +529,7 @@ public static class AmprExports
         var offset = 0UL;
         while (offset < writeOffset)
         {
-            if (!ctx.TryReadUInt32(buffer + offset, out var recordType))
+            if (!TryReadUInt32(ctx, buffer + offset, out var recordType))
             {
                 return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
             }
@@ -649,6 +645,7 @@ public static class AmprExports
             state.Buffer = buffer;
             state.Size = size;
             state.WriteOffset = writeOffset;
+            state.CommandCount = 0;
         }
     }
 
@@ -681,6 +678,7 @@ public static class AmprExports
                 state.Buffer = buffer;
                 state.Size = size;
                 state.WriteOffset = 0;
+                state.CommandCount = 0;
             }
 
             return true;
@@ -911,6 +909,7 @@ public static class AmprExports
             }
 
             state.WriteOffset += recordSize;
+            state.CommandCount++;
         }
 
         return true;
@@ -963,6 +962,19 @@ public static class AmprExports
         return true;
     }
 
+    private static bool TryReadUInt32(CpuContext ctx, ulong address, out uint value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(uint)];
+        if (!ctx.Memory.TryRead(address, buffer))
+        {
+            value = 0;
+            return false;
+        }
+
+        value = BinaryPrimitives.ReadUInt32LittleEndian(buffer);
+        return true;
+    }
+
     private static void TraceAmpr(CpuContext ctx, string operation, ulong commandBuffer, ulong arg0, ulong arg1)
     {
         if (!_traceAmpr)

src/SharpEmu.Libs/Audio/AjmExports.cs

@@ -0,0 +1,104 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+using System.Buffers.Binary;
+using System.Collections.Concurrent;
+using System.Threading;
+
+namespace SharpEmu.Libs.Audio;
+
+public static class AjmExports
+{
+    private static readonly ConcurrentDictionary<uint, byte> Contexts = new();
+    private static int _nextContextId;
+    public static int AjmInitialize(CpuContext ctx)
+    {
+        var reserved = ctx[CpuRegister.Rdi];
+        var outputAddress = ctx[CpuRegister.Rsi];
+        if (reserved != 0 || outputAddress == 0)
+        {
+            return unchecked((int)0x806A0001);
+        }
+
+        var contextId = unchecked((uint)Interlocked.Increment(ref _nextContextId));
+        Span<byte> value = stackalloc byte[sizeof(uint)];
+        BinaryPrimitives.WriteUInt32LittleEndian(value, contextId);
+        if (!ctx.Memory.TryWrite(outputAddress, value))
+        {
+            return unchecked((int)0x806A0001);
+        }
+
+        Contexts[contextId] = 0;
+        if (string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_AJM"), "1", StringComparison.Ordinal))
+        {
+            Console.Error.WriteLine(
+                $"[LOADER][TRACE] ajm.initialize reserved={reserved} out=0x{outputAddress:X16} context={contextId}");
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return 0;
+    }
+
+    [SysAbiExport(
+        Nid = "MHur6qCsUus",
+        ExportName = "sceAjmFinalize",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceAjm")]
+    public static int AjmFinalize(CpuContext ctx)
+    {
+        Contexts.TryRemove(unchecked((uint)ctx[CpuRegister.Rdi]), out _);
+        ctx[CpuRegister.Rax] = 0;
+        return 0;
+    }
+
+    [SysAbiExport(
+        Nid = "Q3dyFuwGn64",
+        ExportName = "sceAjmModuleRegister",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceAjm")]
+    public static int AjmModuleRegister(CpuContext ctx)
+    {
+        var contextId = unchecked((uint)ctx[CpuRegister.Rdi]);
+        var codecType = unchecked((uint)ctx[CpuRegister.Rsi]);
+        var reserved = ctx[CpuRegister.Rdx];
+        if (reserved != 0 || !Contexts.ContainsKey(contextId))
+        {
+            return unchecked((int)0x806A0001);
+        }
+
+        if (string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_AJM"), "1", StringComparison.Ordinal))
+        {
+            Console.Error.WriteLine(
+                $"[LOADER][TRACE] ajm.module_register context={contextId} codec={codecType} reserved={reserved}");
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return 0;
+    }
+
+    [SysAbiExport(
+        Nid = "Wi7DtlLV+KI",
+        ExportName = "sceAjmModuleUnregister",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceAjm")]
+    public static int AjmModuleUnregister(CpuContext ctx)
+    {
+        ctx[CpuRegister.Rax] = 0;
+        return 0;
+    }
+
+    [SysAbiExport(
+        Nid = "MmpF1XsQiHw",
+        ExportName = "sceAjmBatchInitialize",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceAjm")]
+    public static int AjmBatchInitialize(CpuContext ctx)
+    {
+        // The caller owns and initializes the batch storage. This API resets
+        // its submission cursor on hardware; FMOD does not consume a return
+        // value or an additional output object here.
+        ctx[CpuRegister.Rax] = 0;
+        return 0;
+    }
+}

src/SharpEmu.Libs/Audio/AudioOut2Exports.cs

@@ -3,22 +3,70 @@
 
 using SharpEmu.HLE;
 using System.Buffers.Binary;
+using System.Collections.Concurrent;
+using System.Diagnostics;
+using System.Threading;
 
 namespace SharpEmu.Libs.Audio;
 
 public static class AudioOut2Exports
 {
-    // Sized from guest evidence, not SDK headers: Quake keeps its
-    // SceAudioOut2ContextParam on the stack with the frame canary at param+0x60,
-    // and an earlier 0x80-byte ResetParam write zeroed that canary
-    // (__stack_chk_fail right after sceAudioOut2UserCreate, which silently killed
-    // the whole audio init). Stay well below 0x60 and only write the prefix we
-    // populate.
-    private const int AudioOut2ContextParamSize = 0x30;
+    // FMOD's PS5 backend allocates this ABI structure as four 16-byte lanes.
+    // Clearing 0x80 bytes here overwrote the caller's stack canary immediately
+    // following the 0x40-byte parameter block.
+    private const int AudioOut2ContextParamSize = 0x40;
     private const int AudioOut2ContextMemorySize = 0x10000;
+    private const int AudioOut2ContextMemoryAlignment = 0x10000;
     private static long _nextContextHandle = 1;
     private static long _nextUserHandle = 1;
     private static int _nextPortId;
+    private static long _pushTraceCount;
+
+    // Per-context audio parameters captured at ContextCreate so ContextAdvance
+    // can pace to the real playback cadence (grain samples at the sample rate).
+    private static readonly ConcurrentDictionary<ulong, ContextState> Contexts = new();
+
+    private sealed class ContextState
+    {
+        private readonly object _paceGate = new();
+        private long _nextAdvanceTimestamp;
+
+        public ContextState(uint frequency, uint channels, uint grainSamples)
+        {
+            Frequency = frequency == 0 ? 48000 : frequency;
+            Channels = channels == 0 ? 2 : channels;
+            GrainSamples = grainSamples == 0 ? 256 : grainSamples;
+        }
+
+        public uint Frequency { get; }
+        public uint Channels { get; }
+        public uint GrainSamples { get; }
+
+        // Blocks the advancing thread until one grain worth of wall-clock time
+        // has elapsed since the previous advance, matching hardware timing so
+        // audio-gated titles neither spin nor drift ahead.
+        public void PaceAdvance()
+        {
+            long delay;
+            lock (_paceGate)
+            {
+                var now = Stopwatch.GetTimestamp();
+                if (_nextAdvanceTimestamp < now)
+                {
+                    _nextAdvanceTimestamp = now;
+                }
+
+                delay = _nextAdvanceTimestamp - now;
+                _nextAdvanceTimestamp += checked(
+                    (long)Math.Ceiling(Stopwatch.Frequency * (double)GrainSamples / Frequency));
+            }
+
+            if (delay > 0)
+            {
+                Thread.Sleep(TimeSpan.FromSeconds((double)delay / Stopwatch.Frequency));
+            }
+        }
+    }
 
     [SysAbiExport(
         Nid = "g2tViFIohHE",
@@ -41,7 +89,7 @@ public static class AudioOut2Exports
         var paramAddress = ctx[CpuRegister.Rdi];
         if (paramAddress == 0)
         {
-            return ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         Span<byte> param = stackalloc byte[AudioOut2ContextParamSize];
@@ -52,8 +100,8 @@ public static class AudioOut2Exports
         BinaryPrimitives.WriteUInt32LittleEndian(param[0x0C..], 0x400);
 
         return ctx.Memory.TryWrite(paramAddress, param)
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
     }
 
     [SysAbiExport(
@@ -64,15 +112,22 @@ public static class AudioOut2Exports
     public static int AudioOut2ContextQueryMemory(CpuContext ctx)
     {
         var paramAddress = ctx[CpuRegister.Rdi];
-        var outMemorySizeAddress = ctx[CpuRegister.Rsi];
-        if (paramAddress == 0 || outMemorySizeAddress == 0)
+        var memoryInfoAddress = ctx[CpuRegister.Rsi];
+        if (paramAddress == 0 || memoryInfoAddress == 0)
         {
-            return ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
-        
-        return ctx.TryWriteUInt64(outMemorySizeAddress, AudioOut2ContextMemorySize)
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+
+        Span<byte> memoryInfo = stackalloc byte[0x20];
+        memoryInfo.Clear();
+        BinaryPrimitives.WriteUInt64LittleEndian(memoryInfo[0x00..], AudioOut2ContextMemorySize);
+        BinaryPrimitives.WriteUInt64LittleEndian(memoryInfo[0x08..], AudioOut2ContextMemoryAlignment);
+        BinaryPrimitives.WriteUInt64LittleEndian(memoryInfo[0x10..], AudioOut2ContextMemorySize);
+        BinaryPrimitives.WriteUInt64LittleEndian(memoryInfo[0x18..], AudioOut2ContextMemoryAlignment);
+
+        return ctx.Memory.TryWrite(memoryInfoAddress, memoryInfo)
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
     }
 
     [SysAbiExport(
@@ -88,13 +143,34 @@ public static class AudioOut2Exports
         var outContextAddress = ctx[CpuRegister.Rcx];
         if (paramAddress == 0 || memoryAddress == 0 || memorySize == 0 || outContextAddress == 0)
         {
-            return ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        // Read channels/frequency/grain from the reset-param blob so the
+        // context can pace advances to the real audio cadence.
+        uint channels = 2;
+        uint frequency = 48000;
+        uint grain = 256;
+        Span<byte> param = stackalloc byte[AudioOut2ContextParamSize];
+        if (ctx.Memory.TryRead(paramAddress, param))
+        {
+            var pc = BinaryPrimitives.ReadUInt32LittleEndian(param[0x04..]);
+            var pf = BinaryPrimitives.ReadUInt32LittleEndian(param[0x08..]);
+            var pg = BinaryPrimitives.ReadUInt32LittleEndian(param[0x0C..]);
+            if (pc is > 0 and <= 8) channels = pc;
+            if (pf is >= 8000 and <= 192000) frequency = pf;
+            // Values below one cache line are flags/counts in observed PS5
+            // callers, not audio grains. Keep the hardware-sized default.
+            if (pg is >= 64 and <= 0x4000) grain = pg;
+            TraceAudioOut2($"context-param address=0x{paramAddress:X} bytes={Convert.ToHexString(param)}");
         }
 
         var handle = (ulong)Interlocked.Increment(ref _nextContextHandle);
-        return ctx.TryWriteUInt64(outContextAddress, handle)
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        Contexts[handle] = new ContextState(frequency, channels, grain);
+        TraceAudioOut2($"context-create handle=0x{handle:X} frequency={frequency} channels={channels} grain={grain} memory=0x{memoryAddress:X} size=0x{memorySize:X}");
+        return TryWriteUInt64(ctx, outContextAddress, handle)
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
     }
 
     [SysAbiExport(
@@ -102,7 +178,77 @@ public static class AudioOut2Exports
         ExportName = "sceAudioOut2ContextDestroy",
         Target = Generation.Gen5,
         LibraryName = "libSceAudioOut2")]
-    public static int AudioOut2ContextDestroy(CpuContext ctx) => ctx.SetReturn(0);
+    public static int AudioOut2ContextDestroy(CpuContext ctx)
+    {
+        Contexts.TryRemove(ctx[CpuRegister.Rdi], out _);
+        return SetReturn(ctx, 0);
+    }
+
+    [SysAbiExport(
+        Nid = "DxGyV8dtOR8",
+        ExportName = "sceAudioOut2ContextBedWrite",
+        Target = Generation.Gen5,
+        LibraryName = "libSceAudioOut2")]
+    public static int AudioOut2ContextBedWrite(CpuContext ctx) => SetReturn(ctx, 0);
+
+    [SysAbiExport(
+        Nid = "aII9h5nli9U",
+        ExportName = "sceAudioOut2ContextPush",
+        Target = Generation.Gen5,
+        LibraryName = "libSceAudioOut2")]
+    public static int AudioOut2ContextPush(CpuContext ctx)
+    {
+        var handle = ctx[CpuRegister.Rdi];
+        var traceCount = Interlocked.Increment(ref _pushTraceCount);
+        if (traceCount <= 16)
+        {
+            TraceAudioOut2($"context-push count={traceCount} rdi=0x{handle:X} rsi=0x{ctx[CpuRegister.Rsi]:X} rdx=0x{ctx[CpuRegister.Rdx]:X} rcx=0x{ctx[CpuRegister.Rcx]:X}");
+        }
+
+        if (Contexts.TryGetValue(handle, out var context))
+        {
+            // FMOD's PS5 output path uses ContextPush as the submission clock
+            // and does not call ContextAdvance. Pace pushes to one hardware
+            // grain so the feeder cannot outrun playback and starve the game.
+            context.PaceAdvance();
+        }
+
+        return SetReturn(ctx, 0);
+    }
+
+    [SysAbiExport(
+        Nid = "PE2zHMqLSHs",
+        ExportName = "sceAudioOut2ContextAdvance",
+        Target = Generation.Gen5,
+        LibraryName = "libSceAudioOut2")]
+    public static int AudioOut2ContextAdvance(CpuContext ctx)
+    {
+        // Advancing renders one grain of audio on hardware; pace it to the same
+        // wall-clock cadence so the guest audio thread runs at the right speed.
+        if (Contexts.TryGetValue(ctx[CpuRegister.Rdi], out var context))
+        {
+            context.PaceAdvance();
+        }
+
+        return SetReturn(ctx, 0);
+    }
+
+    [SysAbiExport(
+        Nid = "R7d0F1g2qsU",
+        ExportName = "sceAudioOut2ContextGetQueueLevel",
+        Target = Generation.Gen5,
+        LibraryName = "libSceAudioOut2")]
+    public static int AudioOut2ContextGetQueueLevel(CpuContext ctx)
+    {
+        // The advance path paces synchronously, so the queue is always drained.
+        var levelAddress = ctx[CpuRegister.Rsi];
+        if (levelAddress != 0)
+        {
+            _ = TryWriteUInt64(ctx, levelAddress, 0);
+        }
+
+        return SetReturn(ctx, 0);
+    }
 
     [SysAbiExport(
         Nid = "JK2wamZPzwM",
@@ -117,16 +263,23 @@ public static class AudioOut2Exports
         var contextAddress = ctx[CpuRegister.Rcx];
         if (type < 0 || type > 255 || paramAddress == 0 || outPortAddress == 0 || contextAddress == 0)
         {
-            return ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         var portId = unchecked((uint)Interlocked.Increment(ref _nextPortId)) & 0xFF;
         var handle = 0x2000_0000UL | ((ulong)(uint)type << 16) | portId;
-        return ctx.TryWriteUInt64(outPortAddress, handle)
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        return TryWriteUInt64(ctx, outPortAddress, handle)
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
     }
 
+    [SysAbiExport(
+        Nid = "8XTArSPyWHk",
+        ExportName = "sceAudioOut2PortSetAttributes",
+        Target = Generation.Gen5,
+        LibraryName = "libSceAudioOut2")]
+    public static int AudioOut2PortSetAttributes(CpuContext ctx) => SetReturn(ctx, 0);
+
     [SysAbiExport(
         Nid = "gatEUKG+Ea4",
         ExportName = "sceAudioOut2PortGetState",
@@ -138,7 +291,7 @@ public static class AudioOut2Exports
         var stateAddress = ctx[CpuRegister.Rsi];
         if (handle == 0 || stateAddress == 0)
         {
-            return ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         var type = (int)((handle >> 16) & 0xFF);
@@ -151,8 +304,8 @@ public static class AudioOut2Exports
         BinaryPrimitives.WriteInt16LittleEndian(state[0x04..], -1);
 
         return ctx.Memory.TryWrite(stateAddress, state)
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
     }
 
     [SysAbiExport(
@@ -165,7 +318,7 @@ public static class AudioOut2Exports
         var infoAddress = ctx[CpuRegister.Rdi];
         if (infoAddress == 0)
         {
-            return ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         Span<byte> info = stackalloc byte[0x40];
@@ -175,8 +328,8 @@ public static class AudioOut2Exports
         BinaryPrimitives.WriteUInt32LittleEndian(info[0x08..], 48000);
 
         return ctx.Memory.TryWrite(infoAddress, info)
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
     }
 
     [SysAbiExport(
@@ -184,14 +337,14 @@ public static class AudioOut2Exports
         ExportName = "sceAudioOut2PortDestroy",
         Target = Generation.Gen5,
         LibraryName = "libSceAudioOut2")]
-    public static int AudioOut2PortDestroy(CpuContext ctx) => ctx.SetReturn(0);
+    public static int AudioOut2PortDestroy(CpuContext ctx) => SetReturn(ctx, 0);
 
     [SysAbiExport(
         Nid = "IaZXJ9M79uo",
         ExportName = "sceAudioOut2UserDestroy",
         Target = Generation.Gen5,
         LibraryName = "libSceAudioOut2")]
-    public static int AudioOut2UserDestroy(CpuContext ctx) => ctx.SetReturn(0);
+    public static int AudioOut2UserDestroy(CpuContext ctx) => SetReturn(ctx, 0);
 
     [SysAbiExport(
         Nid = "xywYcRB7nbQ",
@@ -202,14 +355,36 @@ public static class AudioOut2Exports
     {
         var userId = unchecked((int)ctx[CpuRegister.Rdi]);
         var outUserAddress = ctx[CpuRegister.Rsi];
-        if ((userId != 0 && userId != 1 && userId != 1000 && userId != 255) || outUserAddress == 0)
+        if ((userId != 0 && userId != 1 && userId != 1000 && userId != 0x10000000 && userId != 255) ||
+            outUserAddress == 0)
         {
-            return ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         var handle = (ulong)Interlocked.Increment(ref _nextUserHandle);
-        return ctx.TryWriteUInt64(outUserAddress, handle)
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        return TryWriteUInt64(ctx, outUserAddress, handle)
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+    }
+
+    private static bool TryWriteUInt64(CpuContext ctx, ulong address, ulong value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(ulong)];
+        BinaryPrimitives.WriteUInt64LittleEndian(buffer, value);
+        return ctx.Memory.TryWrite(address, buffer);
+    }
+
+    private static int SetReturn(CpuContext ctx, int result)
+    {
+        ctx[CpuRegister.Rax] = unchecked((ulong)result);
+        return result;
+    }
+
+    private static void TraceAudioOut2(string message)
+    {
+        if (string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_AUDIO_OUT2"), "1", StringComparison.Ordinal))
+        {
+            Console.Error.WriteLine($"[LOADER][TRACE] audio_out2.{message}");
+        }
     }
 }

src/SharpEmu.Libs/Audio/AudioOutExports.cs

@@ -50,6 +50,7 @@ public static class AudioOutExports
         public int BytesPerSample { get; }
         public bool IsFloat { get; }
         public IHostAudioStream? Backend { get; }
+        public volatile float Volume = 1.0f;
         public int BufferByteLength =>
             checked((int)BufferLength * Channels * BytesPerSample);
 
@@ -198,7 +199,8 @@ public static class AudioOutExports
                     checked((int)port.BufferLength),
                     port.Channels,
                     port.BytesPerSample,
-                    port.IsFloat);
+                    port.IsFloat,
+                    port.Volume);
                 if (!port.Backend.Submit(output.AsSpan(0, outputLength)))
                 {
                     port.PaceSilence();
@@ -225,10 +227,43 @@ public static class AudioOutExports
     public static int AudioOutSetVolume(CpuContext ctx)
     {
         var handle = unchecked((int)ctx[CpuRegister.Rdi]);
-        return ctx.SetReturn(
-            Ports.ContainsKey(handle)
-                ? 0
-                : (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        var channelFlags = unchecked((uint)ctx[CpuRegister.Rsi]);
+        var volumeArrayAddress = ctx[CpuRegister.Rdx];
+        if (!Ports.TryGetValue(handle, out var port))
+        {
+            return ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        const int unityVolume = 32768;
+        var maxVolume = 0;
+        var found = false;
+        if (volumeArrayAddress != 0)
+        {
+            Span<byte> raw = stackalloc byte[sizeof(int)];
+            for (var channel = 0; channel < 8; channel++)
+            {
+                if ((channelFlags & (1u << channel)) == 0)
+                {
+                    continue;
+                }
+
+                if (!ctx.Memory.TryRead(volumeArrayAddress + (ulong)(channel * sizeof(int)), raw))
+                {
+                    return ctx.SetReturn((int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+                }
+
+                var value = System.Buffers.Binary.BinaryPrimitives.ReadInt32LittleEndian(raw);
+                maxVolume = Math.Max(maxVolume, value);
+                found = true;
+            }
+        }
+
+        if (found)
+        {
+            port.Volume = Math.Clamp(maxVolume / (float)unityVolume, 0f, 1f);
+        }
+
+        return ctx.SetReturn(0);
     }
 
     public static void ShutdownAllPorts()

src/SharpEmu.Libs/Audio/AudioPcmConversion.cs

@@ -21,7 +21,8 @@ internal static class AudioPcmConversion
         int frames,
         int channels,
         int bytesPerSample,
-        bool isFloat)
+        bool isFloat,
+        float volume)
     {
         var sourceFrameSize = checked(channels * bytesPerSample);
         for (var frame = 0; frame < frames; frame++)
@@ -31,6 +32,8 @@ internal static class AudioPcmConversion
             var right = channels == 1
                 ? left
                 : ReadSample(sourceFrame, 1, bytesPerSample, isFloat);
+            left = ApplyVolume(left, volume);
+            right = ApplyVolume(right, volume);
             BinaryPrimitives.WriteInt16LittleEndian(destination[(frame * OutputFrameSize)..], left);
             BinaryPrimitives.WriteInt16LittleEndian(destination[((frame * OutputFrameSize) + 2)..], right);
         }
@@ -49,7 +52,24 @@ internal static class AudioPcmConversion
         }
 
         var bits = BinaryPrimitives.ReadInt32LittleEndian(sample);
-        var value = Math.Clamp(BitConverter.Int32BitsToSingle(bits), -1.0f, 1.0f);
-        return checked((short)MathF.Round(value * short.MaxValue));
+        return ConvertFloatSample(BitConverter.Int32BitsToSingle(bits));
+    }
+
+    private static short ConvertFloatSample(float value)
+    {
+        if (float.IsNaN(value))
+        {
+            return 0;
+        }
+
+        value = Math.Clamp(value, -1.0f, 1.0f);
+        var scale = value < 0.0f ? 32768.0f : short.MaxValue;
+        return checked((short)MathF.Round(value * scale));
+    }
+
+    private static short ApplyVolume(short sample, float volume)
+    {
+        var scaled = MathF.Round(sample * Math.Clamp(volume, 0.0f, 1.0f));
+        return (short)Math.Clamp(scaled, short.MinValue, short.MaxValue);
     }
 }

src/SharpEmu.Libs/Audio/FmodCompatExports.cs

@@ -0,0 +1,47 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+using System.Buffers.Binary;
+using System.Collections.Concurrent;
+
+namespace SharpEmu.Libs.Audio;
+
+public static class FmodCompatExports
+{
+    private static readonly ConcurrentDictionary<ulong, int> SetOutputCalls = new();
+
+    [SysAbiExport(
+        Nid = "uPLTdl3psGk",
+        Target = Generation.Gen5,
+        LibraryName = "libfmod")]
+    public static int FmodSystemSetOutput(CpuContext ctx)
+    {
+        var system = ctx[CpuRegister.Rdi];
+        var output = unchecked((int)ctx[CpuRegister.Rsi]);
+        var callCount = SetOutputCalls.AddOrUpdate(system, 1, static (_, count) => count + 1);
+        var resetPrematureInit = callCount <= 2;
+        if (resetPrematureInit && system != 0)
+        {
+            Span<byte> zeroByte = stackalloc byte[1];
+            Span<byte> outputBytes = stackalloc byte[sizeof(int)];
+            Span<byte> zeroInt = stackalloc byte[sizeof(int)];
+            BinaryPrimitives.WriteInt32LittleEndian(outputBytes, output);
+            _ = ctx.Memory.TryWrite(system + 0x08, zeroByte);
+            _ = ctx.Memory.TryWrite(system + 0x116D0, outputBytes);
+            _ = ctx.Memory.TryWrite(system + 0x116D4, zeroInt);
+        }
+
+        if (string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_FMOD"), "1", StringComparison.Ordinal))
+        {
+            Console.Error.WriteLine(
+                $"[LOADER][TRACE] fmod.system_set_output system=0x{system:X16} output={output} call={callCount} reset_premature_init={resetPrematureInit} -> 0");
+        }
+
+        // The PS5 FMOD object arrives with its initialized byte set before Unity has
+        // applied the startup output configuration. Preserve those settings while
+        // clearing the premature marker so Studio can execute the real core init.
+        ctx[CpuRegister.Rax] = 0;
+        return 0;
+    }
+}

src/SharpEmu.Libs/Bink/Bink2MovieBridge.cs

@@ -0,0 +1,403 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Runtime.InteropServices;
+using System.Buffers.Binary;
+
+namespace SharpEmu.Libs.Bink;
+
+/// <summary>
+/// Optional host-side Bink 2 bridge for games that ship a static Bink player.
+///
+/// The game in that case never imports libSceVideodec, so an HLE video-decoder
+/// export cannot see its movie frames. Kernel file opens identify the active
+/// .bk2 file and the presenter requests BGRA frames from a tiny native adapter.
+/// The adapter is deliberately a separate, user-supplied library: Bink 2 is a
+/// proprietary SDK and SharpEmu must neither bundle it nor depend on its ABI.
+/// </summary>
+internal static class Bink2MovieBridge
+{
+    private const uint MaxDimension = 16384;
+    private static readonly object Gate = new();
+    private static NativeAdapter? _adapter;
+    private static string? _activePath;
+    private static IntPtr _activeMovie;
+    private static Bink2MovieInfo _activeInfo;
+    private static byte[]? _frameBuffer;
+    private static bool _usingDummyMovie;
+    private static bool _loadAttempted;
+    private static bool _availabilityReported;
+
+    /// <summary>
+    /// Returns true when the guest should receive a normal "file not found"
+    /// result for a Bink movie. This is the safe default without a decoder:
+    /// games that treat movies as optional fall through to their next state
+    /// rather than submitting an empty Bink GPU texture forever.
+    /// </summary>
+    internal static bool ShouldSkipGuestMovie(string hostPath) =>
+        hostPath.EndsWith(".bk2", StringComparison.OrdinalIgnoreCase) &&
+        ResolveMode() == MovieMode.Skip;
+
+    internal static void ObserveGuestMovie(string hostPath)
+    {
+        if (!hostPath.EndsWith(".bk2", StringComparison.OrdinalIgnoreCase) ||
+            !File.Exists(hostPath))
+        {
+            return;
+        }
+
+        lock (Gate)
+        {
+            if (string.Equals(_activePath, hostPath, StringComparison.OrdinalIgnoreCase))
+            {
+                return;
+            }
+
+            if (ResolveMode() == MovieMode.Dummy)
+            {
+                AttachDummyMovieLocked(hostPath);
+                return;
+            }
+
+            var adapter = GetAdapterLocked();
+            if (adapter is null)
+            {
+                return;
+            }
+
+            CloseActiveLocked();
+            if (!adapter.TryOpen(hostPath, out var movie, out var info))
+            {
+                Console.Error.WriteLine(
+                    "[LOADER][WARN] Bink2 bridge could not open movie '" +
+                    Path.GetFileName(hostPath) + "'.");
+                return;
+            }
+
+            if (!IsValid(info))
+            {
+                adapter.Close(movie);
+                Console.Error.WriteLine(
+                    "[LOADER][WARN] Bink2 bridge rejected invalid movie dimensions for '" +
+                    Path.GetFileName(hostPath) + "'.");
+                return;
+            }
+
+            _activePath = hostPath;
+            _activeMovie = movie;
+            _activeInfo = info;
+            _frameBuffer = GC.AllocateUninitializedArray<byte>(GetFrameBufferLength(info));
+            Console.Error.WriteLine(
+                "[LOADER][INFO] Bink2 bridge attached: " + Path.GetFileName(hostPath) + " " +
+                info.Width + "x" + info.Height + " @ " +
+                info.FramesPerSecondNumerator + "/" + info.FramesPerSecondDenominator + " fps.");
+        }
+    }
+
+    internal static bool TryDecodeNextFrame(
+        out byte[] pixels,
+        out uint width,
+        out uint height)
+    {
+        lock (Gate)
+        {
+            pixels = [];
+            width = 0;
+            height = 0;
+            if (_adapter is null || _activeMovie == IntPtr.Zero || _frameBuffer is null)
+            {
+                if (_usingDummyMovie && _frameBuffer is not null)
+                {
+                    pixels = _frameBuffer;
+                    width = _activeInfo.Width;
+                    height = _activeInfo.Height;
+                    return true;
+                }
+
+                return false;
+            }
+
+            unsafe
+            {
+                fixed (byte* destination = _frameBuffer)
+                {
+                    if (!_adapter.DecodeNextBgra(
+                            _activeMovie,
+                            (IntPtr)destination,
+                            _activeInfo.Width * 4,
+                            (uint)_frameBuffer.Length))
+                    {
+                        return false;
+                    }
+                }
+            }
+
+            pixels = _frameBuffer;
+            width = _activeInfo.Width;
+            height = _activeInfo.Height;
+            return true;
+        }
+    }
+
+    private static bool IsValid(Bink2MovieInfo info) =>
+        info.Width > 0 && info.Height > 0 &&
+        info.Width <= MaxDimension && info.Height <= MaxDimension &&
+        (ulong)info.Width * info.Height * 4 <= int.MaxValue;
+
+    private static int GetFrameBufferLength(Bink2MovieInfo info) =>
+        checked((int)((ulong)info.Width * info.Height * 4));
+
+    private static MovieMode ResolveMode()
+    {
+        var configured = Environment.GetEnvironmentVariable("SHARPEMU_BINK_MODE");
+        if (string.Equals(configured, "dummy", StringComparison.OrdinalIgnoreCase))
+        {
+            return MovieMode.Dummy;
+        }
+
+        if (string.Equals(configured, "native", StringComparison.OrdinalIgnoreCase))
+        {
+            return MovieMode.Native;
+        }
+
+        if (string.Equals(configured, "skip", StringComparison.OrdinalIgnoreCase))
+        {
+            return MovieMode.Skip;
+        }
+
+        // With no SDK adapter present, returning "not found" makes optional
+        // cinematics advance. Supplying either an explicit path or the normal
+        // side-by-side adapter enables native playback automatically.
+        if (!string.IsNullOrWhiteSpace(Environment.GetEnvironmentVariable("SHARPEMU_BINK2_BRIDGE")) ||
+            EnumerateAdapterCandidates().Any(File.Exists))
+        {
+            return MovieMode.Native;
+        }
+
+        return MovieMode.Skip;
+    }
+
+    private static void AttachDummyMovieLocked(string hostPath)
+    {
+        if (!TryReadBinkInfo(hostPath, out var info) || !IsValid(info))
+        {
+            Console.Error.WriteLine(
+                "[LOADER][WARN] Bink dummy could not read movie header '" +
+                Path.GetFileName(hostPath) + "'.");
+            return;
+        }
+
+        CloseActiveLocked();
+        _activePath = hostPath;
+        _activeInfo = info;
+        _frameBuffer = GC.AllocateUninitializedArray<byte>(GetFrameBufferLength(info));
+        FillDummyFrame(_frameBuffer, info.Width, info.Height);
+        _usingDummyMovie = true;
+        Console.Error.WriteLine(
+            "[LOADER][INFO] Bink dummy attached: " + Path.GetFileName(hostPath) + " " +
+            info.Width + "x" + info.Height + ".");
+    }
+
+    private static bool TryReadBinkInfo(string path, out Bink2MovieInfo info)
+    {
+        info = default;
+        Span<byte> header = stackalloc byte[32];
+        try
+        {
+            using var stream = File.OpenRead(path);
+            if (stream.Read(header) != header.Length ||
+                !header[..4].SequenceEqual("KB2j"u8))
+            {
+                return false;
+            }
+
+            info = new Bink2MovieInfo(
+                BinaryPrimitives.ReadUInt32LittleEndian(header.Slice(0x14, 4)),
+                BinaryPrimitives.ReadUInt32LittleEndian(header.Slice(0x18, 4)),
+                BinaryPrimitives.ReadUInt32LittleEndian(header.Slice(0x1C, 4)),
+                1);
+            return true;
+        }
+        catch (IOException)
+        {
+            return false;
+        }
+    }
+
+    private static void FillDummyFrame(byte[] pixels, uint width, uint height)
+    {
+        for (var y = 0u; y < height; y++)
+        {
+            for (var x = 0u; x < width; x++)
+            {
+                var offset = checked((int)(((ulong)y * width + x) * 4));
+                var band = ((x / 96) + (y / 96)) & 1;
+                pixels[offset] = band == 0 ? (byte)0x28 : (byte)0x18;
+                pixels[offset + 1] = band == 0 ? (byte)0x18 : (byte)0x28;
+                pixels[offset + 2] = 0x10;
+                pixels[offset + 3] = 0xFF;
+            }
+        }
+    }
+
+    private static NativeAdapter? GetAdapterLocked()
+    {
+        if (_loadAttempted)
+        {
+            return _adapter;
+        }
+
+        _loadAttempted = true;
+        foreach (var candidate in EnumerateAdapterCandidates())
+        {
+            if (!NativeLibrary.TryLoad(candidate, out var library))
+            {
+                continue;
+            }
+
+            if (NativeAdapter.TryCreate(library, out var adapter))
+            {
+                _adapter = adapter;
+                Console.Error.WriteLine("[LOADER][INFO] Bink2 bridge loaded: " + candidate);
+                return adapter;
+            }
+
+            NativeLibrary.Free(library);
+        }
+
+        if (!_availabilityReported)
+        {
+            _availabilityReported = true;
+            Console.Error.WriteLine(
+                "[LOADER][INFO] Bink2 bridge unavailable; install the licensed adapter and set SHARPEMU_BINK2_BRIDGE.");
+        }
+
+        return null;
+    }
+
+    private static IEnumerable<string> EnumerateAdapterCandidates()
+    {
+        var configured = Environment.GetEnvironmentVariable("SHARPEMU_BINK2_BRIDGE");
+        if (!string.IsNullOrWhiteSpace(configured))
+        {
+            yield return configured;
+        }
+
+        var baseDirectory = AppContext.BaseDirectory;
+        if (OperatingSystem.IsMacOS())
+        {
+            yield return Path.Combine(baseDirectory, "libsharpemu_bink2_bridge.dylib");
+        }
+        else if (OperatingSystem.IsWindows())
+        {
+            yield return Path.Combine(baseDirectory, "sharpemu_bink2_bridge.dll");
+        }
+        else
+        {
+            yield return Path.Combine(baseDirectory, "libsharpemu_bink2_bridge.so");
+        }
+    }
+
+    private static void CloseActiveLocked()
+    {
+        if (_activeMovie != IntPtr.Zero)
+        {
+            _adapter?.Close(_activeMovie);
+        }
+
+        _activePath = null;
+        _activeMovie = IntPtr.Zero;
+        _activeInfo = default;
+        _frameBuffer = null;
+        _usingDummyMovie = false;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    private readonly struct Bink2MovieInfo
+    {
+        public readonly uint Width;
+        public readonly uint Height;
+        public readonly uint FramesPerSecondNumerator;
+        public readonly uint FramesPerSecondDenominator;
+
+        internal Bink2MovieInfo(
+            uint width,
+            uint height,
+            uint framesPerSecondNumerator,
+            uint framesPerSecondDenominator)
+        {
+            Width = width;
+            Height = height;
+            FramesPerSecondNumerator = framesPerSecondNumerator;
+            FramesPerSecondDenominator = framesPerSecondDenominator;
+        }
+    }
+
+    private enum MovieMode
+    {
+        Skip,
+        Dummy,
+        Native,
+    }
+
+    private sealed class NativeAdapter
+    {
+        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+        private delegate int OpenUtf8Delegate(IntPtr pathUtf8, out IntPtr movie, out Bink2MovieInfo info);
+
+        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+        private delegate int DecodeNextBgraDelegate(IntPtr movie, IntPtr destination, uint stride, uint destinationBytes);
+
+        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+        private delegate void CloseDelegate(IntPtr movie);
+
+        private readonly OpenUtf8Delegate _openUtf8;
+        private readonly DecodeNextBgraDelegate _decodeNextBgra;
+        private readonly CloseDelegate _close;
+
+        private NativeAdapter(
+            OpenUtf8Delegate openUtf8,
+            DecodeNextBgraDelegate decodeNextBgra,
+            CloseDelegate close)
+        {
+            _openUtf8 = openUtf8;
+            _decodeNextBgra = decodeNextBgra;
+            _close = close;
+        }
+
+        internal static bool TryCreate(IntPtr library, out NativeAdapter? adapter)
+        {
+            adapter = null;
+            if (!NativeLibrary.TryGetExport(library, "sharpemu_bink2_open_utf8", out var open) ||
+                !NativeLibrary.TryGetExport(library, "sharpemu_bink2_decode_next_bgra", out var decode) ||
+                !NativeLibrary.TryGetExport(library, "sharpemu_bink2_close", out var close))
+            {
+                return false;
+            }
+
+            adapter = new NativeAdapter(
+                Marshal.GetDelegateForFunctionPointer<OpenUtf8Delegate>(open),
+                Marshal.GetDelegateForFunctionPointer<DecodeNextBgraDelegate>(decode),
+                Marshal.GetDelegateForFunctionPointer<CloseDelegate>(close));
+            return true;
+        }
+
+        internal bool TryOpen(string path, out IntPtr movie, out Bink2MovieInfo info)
+        {
+            var utf8 = Marshal.StringToCoTaskMemUTF8(path);
+            try
+            {
+                return _openUtf8(utf8, out movie, out info) != 0 && movie != IntPtr.Zero;
+            }
+            finally
+            {
+                Marshal.FreeCoTaskMem(utf8);
+            }
+        }
+
+        internal bool DecodeNextBgra(IntPtr movie, IntPtr destination, uint stride, uint destinationBytes) =>
+            _decodeNextBgra(movie, destination, stride, destinationBytes) != 0;
+
+        internal void Close(IntPtr movie) => _close(movie);
+    }
+}

src/SharpEmu.Libs/Codec/CodecExports.cs

@@ -0,0 +1,104 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+using SharpEmu.Libs.Kernel;
+using System.Collections.Concurrent;
+using System.Threading;
+
+namespace SharpEmu.Libs.Codec;
+
+/// <summary>
+/// libSceVideodec / libSceAudiodec handle management. Actual H.264/HEVC and
+/// AAC/AT9 decoding requires an external codec, which is out of scope; these
+/// exports keep the decoder lifecycle resolvable (create/decode/flush/delete)
+/// and report "no output produced" so guests advance instead of failing on
+/// unresolved imports.
+/// </summary>
+public static class CodecExports
+{
+    private const int Ok = 0;
+    private const int VideodecErrorInvalidArg = unchecked((int)0x80620801);
+    private const int AudiodecErrorInvalidArg = unchecked((int)0x807F0002);
+
+    private static readonly ConcurrentDictionary<ulong, byte> VideoDecoders = new();
+    private static readonly ConcurrentDictionary<ulong, byte> AudioDecoders = new();
+    private static long _nextHandle = 1;
+
+    // ---- Video decoder ----
+
+    [SysAbiExport(Nid = "qkgRiwHyheU", ExportName = "sceVideodecCreateDecoder",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceVideodec")]
+    public static int VideodecCreateDecoder(CpuContext ctx)
+    {
+        var outHandleAddress = ctx[CpuRegister.Rdx];
+        if (outHandleAddress == 0)
+        {
+            return SetReturn(ctx, VideodecErrorInvalidArg);
+        }
+
+        var handle = (ulong)Interlocked.Increment(ref _nextHandle);
+        VideoDecoders[handle] = 1;
+        return TryWriteHandle(ctx, outHandleAddress, handle) ? SetReturn(ctx, Ok) : SetReturn(ctx, VideodecErrorInvalidArg);
+    }
+
+    [SysAbiExport(Nid = "q0W5GJMovMs", ExportName = "sceVideodecDecode",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceVideodec")]
+    public static int VideodecDecode(CpuContext ctx)
+    {
+        // No decoder is present: report success with no picture produced.
+        return SetReturn(ctx, VideoDecoders.ContainsKey(ctx[CpuRegister.Rdi]) ? Ok : VideodecErrorInvalidArg);
+    }
+
+    [SysAbiExport(Nid = "jeigLlKdp5I", ExportName = "sceVideodecFlush",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceVideodec")]
+    public static int VideodecFlush(CpuContext ctx) =>
+        SetReturn(ctx, VideoDecoders.ContainsKey(ctx[CpuRegister.Rdi]) ? Ok : VideodecErrorInvalidArg);
+
+    [SysAbiExport(Nid = "U0kpGF1cl90", ExportName = "sceVideodecDeleteDecoder",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceVideodec")]
+    public static int VideodecDeleteDecoder(CpuContext ctx)
+    {
+        VideoDecoders.TryRemove(ctx[CpuRegister.Rdi], out _);
+        return SetReturn(ctx, Ok);
+    }
+
+    // ---- Audio decoder ----
+
+    [SysAbiExport(Nid = "O3f1sLMWRvs", ExportName = "sceAudiodecCreateDecoder",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceAudiodec")]
+    public static int AudiodecCreateDecoder(CpuContext ctx)
+    {
+        var handle = (ulong)Interlocked.Increment(ref _nextHandle);
+        AudioDecoders[handle] = 1;
+        // sceAudiodec returns the handle directly (>= 0) or a negative error.
+        ctx[CpuRegister.Rax] = handle;
+        return unchecked((int)handle);
+    }
+
+    [SysAbiExport(Nid = "KHXHMDLkILw", ExportName = "sceAudiodecDecode",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceAudiodec")]
+    public static int AudiodecDecode(CpuContext ctx)
+    {
+        // No decoder present: report success with zero output samples so the
+        // caller treats the frame as silent rather than erroring.
+        return SetReturn(ctx, AudioDecoders.ContainsKey(ctx[CpuRegister.Rdi]) ? Ok : AudiodecErrorInvalidArg);
+    }
+
+    [SysAbiExport(Nid = "Tp+ZEy69mLk", ExportName = "sceAudiodecDeleteDecoder",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libSceAudiodec")]
+    public static int AudiodecDeleteDecoder(CpuContext ctx)
+    {
+        AudioDecoders.TryRemove(ctx[CpuRegister.Rdi], out _);
+        return SetReturn(ctx, Ok);
+    }
+
+    private static bool TryWriteHandle(CpuContext ctx, ulong address, ulong handle) =>
+        ctx.TryWriteUInt64(address, handle);
+
+    private static int SetReturn(CpuContext ctx, int result)
+    {
+        ctx[CpuRegister.Rax] = unchecked((ulong)result);
+        return result;
+    }
+}

src/SharpEmu.Libs/CommonDialog/ErrorDialogExports.cs

@@ -0,0 +1,106 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+using System.Threading;
+
+namespace SharpEmu.Libs.CommonDialog;
+
+/// <summary>
+/// libSceErrorDialog. There is no host error dialog, so an opened dialog
+/// immediately reports finished — this keeps guests that block on the dialog
+/// status (a common fatal-error path) from spinning forever.
+/// </summary>
+public static class ErrorDialogExports
+{
+    private const int AlreadyInitialized = unchecked((int)0x80ED0001);
+    private const int NotInitialized = unchecked((int)0x80ED0002);
+    private const int ArgNull = unchecked((int)0x80ED0005);
+
+    private const int StatusNone = 0;
+    private const int StatusInitialized = 1;
+    private const int StatusFinished = 3;
+
+    private static int _initialized;
+    private static int _status;
+
+    [SysAbiExport(
+        Nid = "I88KChlynSs",
+        ExportName = "sceErrorDialogInitialize",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceErrorDialog")]
+    public static int ErrorDialogInitialize(CpuContext ctx)
+    {
+        var result = Interlocked.Exchange(ref _initialized, 1) == 0 ? 0 : AlreadyInitialized;
+        if (result == 0)
+        {
+            Volatile.Write(ref _status, StatusInitialized);
+        }
+
+        return SetReturn(ctx, result);
+    }
+
+    [SysAbiExport(
+        Nid = "M2ZF-ClLhgY",
+        ExportName = "sceErrorDialogOpen",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceErrorDialog")]
+    public static int ErrorDialogOpen(CpuContext ctx)
+    {
+        if (ctx[CpuRegister.Rdi] == 0)
+        {
+            return SetReturn(ctx, ArgNull);
+        }
+
+        if (Volatile.Read(ref _initialized) == 0)
+        {
+            return SetReturn(ctx, NotInitialized);
+        }
+
+        Volatile.Write(ref _status, StatusFinished);
+        return SetReturn(ctx, 0);
+    }
+
+    [SysAbiExport(
+        Nid = "t2FvHRXzgqk",
+        ExportName = "sceErrorDialogGetStatus",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceErrorDialog")]
+    public static int ErrorDialogGetStatus(CpuContext ctx) => SetReturn(ctx, Volatile.Read(ref _status));
+
+    [SysAbiExport(
+        Nid = "WWiGuh9XfgQ",
+        ExportName = "sceErrorDialogUpdateStatus",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceErrorDialog")]
+    public static int ErrorDialogUpdateStatus(CpuContext ctx) => SetReturn(ctx, Volatile.Read(ref _status));
+
+    [SysAbiExport(
+        Nid = "ekXHb1kDBl0",
+        ExportName = "sceErrorDialogClose",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceErrorDialog")]
+    public static int ErrorDialogClose(CpuContext ctx)
+    {
+        Volatile.Write(ref _status, StatusFinished);
+        return SetReturn(ctx, 0);
+    }
+
+    [SysAbiExport(
+        Nid = "9XAxK2PMwk8",
+        ExportName = "sceErrorDialogTerminate",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceErrorDialog")]
+    public static int ErrorDialogTerminate(CpuContext ctx)
+    {
+        Volatile.Write(ref _status, StatusNone);
+        Interlocked.Exchange(ref _initialized, 0);
+        return SetReturn(ctx, 0);
+    }
+
+    private static int SetReturn(CpuContext ctx, int result)
+    {
+        ctx[CpuRegister.Rax] = unchecked((ulong)result);
+        return result;
+    }
+}

src/SharpEmu.Libs/ContentExport/ContentExportExports.cs

@@ -0,0 +1,18 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+
+namespace SharpEmu.Libs.ContentExport;
+
+// No host media library exists to export captures into, so initialization
+// reports success.
+public static class ContentExportExports
+{
+    [SysAbiExport(
+        Nid = "0GnN4QCgIfs",
+        ExportName = "sceContentExportInit2",
+        Target = Generation.Gen5,
+        LibraryName = "libSceContentExport")]
+    public static int ContentExportInit2(CpuContext ctx) => ctx.SetReturn(0);
+}

src/SharpEmu.Libs/Fiber/FiberExports.cs

@@ -3,6 +3,7 @@
 
 using System.Buffers.Binary;
 using System.Collections.Concurrent;
+using System.Diagnostics;
 using System.Text;
 using SharpEmu.HLE;
 
@@ -22,6 +23,10 @@ public static class FiberExports
     private const uint FiberStateIdle = 2;
     private const uint FiberStateTerminated = 3;
     private const uint FiberFlagContextSizeCheck = 0x10;
+    private const uint FiberFlagSetFpuRegs = 0x100;
+    private const uint Firmware350BuildVersion = 0x03500000;
+    private const ushort InitialFpuControlWord = 0x037F;
+    private const uint InitialMxcsr = 0x9FC0;
 
     private const int FiberErrorNull = unchecked((int)0x80590001);
     private const int FiberErrorAlignment = unchecked((int)0x80590002);
@@ -45,13 +50,26 @@ public static class FiberExports
 
     private static int _contextSizeCheck;
 
-    [ThreadStatic]
-    private static ulong _currentFiberAddress;
-
     private static readonly object _fiberGate = new();
     private static readonly ConcurrentDictionary<ulong, FiberContinuation> _continuations = new();
-    private static readonly ConcurrentDictionary<ulong, FiberReturnTarget> _returnTargets = new();
     private static readonly ConcurrentDictionary<ulong, FiberStackRange> _stackRanges = new();
+    private static readonly ConcurrentDictionary<ulong, FiberThreadState> _threadStates = new();
+
+    static FiberExports()
+    {
+        RunFiberSelfChecks();
+    }
+
+    public static void ResetRuntimeState()
+    {
+        lock (_fiberGate)
+        {
+            _continuations.Clear();
+            _stackRanges.Clear();
+            _threadStates.Clear();
+            Volatile.Write(ref _contextSizeCheck, 0);
+        }
+    }
 
     [SysAbiExport(
         Nid = "hVYD7Ou2pCQ",
@@ -61,6 +79,7 @@ public static class FiberExports
     public static int FiberInitialize(CpuContext ctx)
     {
         var optParam = ReadStackArg64(ctx, 0);
+        var buildVersion = unchecked((uint)ReadStackArg64(ctx, 1));
         return FiberInitializeCore(
             ctx,
             ctx[CpuRegister.Rdi],
@@ -70,7 +89,8 @@ public static class FiberExports
             ctx[CpuRegister.R8],
             ctx[CpuRegister.R9],
             optParam,
-            flags: 0);
+            flags: 0,
+            buildVersion);
     }
 
     [SysAbiExport(
@@ -82,6 +102,7 @@ public static class FiberExports
     {
         var optParam = ReadStackArg64(ctx, 0);
         var flags = unchecked((uint)ReadStackArg64(ctx, 1));
+        var buildVersion = unchecked((uint)ReadStackArg64(ctx, 2));
         return FiberInitializeCore(
             ctx,
             ctx[CpuRegister.Rdi],
@@ -91,7 +112,8 @@ public static class FiberExports
             ctx[CpuRegister.R8],
             ctx[CpuRegister.R9],
             optParam,
-            flags);
+            flags,
+            buildVersion);
     }
 
     [SysAbiExport(
@@ -104,17 +126,17 @@ public static class FiberExports
         var optParam = ctx[CpuRegister.Rdi];
         if (optParam == 0)
         {
-            return ctx.SetReturn(FiberErrorNull);
+            return SetReturn(ctx, FiberErrorNull);
         }
 
         if ((optParam & 7) != 0)
         {
-            return ctx.SetReturn(FiberErrorAlignment);
+            return SetReturn(ctx, FiberErrorAlignment);
         }
 
-        return ctx.TryWriteUInt32(optParam, FiberOptSignature)
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn(FiberErrorInvalid);
+        return TryWriteUInt32(ctx, optParam, FiberOptSignature)
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, FiberErrorInvalid);
     }
 
     [SysAbiExport(
@@ -127,24 +149,23 @@ public static class FiberExports
         var fiber = ctx[CpuRegister.Rdi];
         if (!TryValidateFiber(ctx, fiber, out var error))
         {
-            return ctx.SetReturn(error);
+            return SetReturn(ctx, error);
         }
 
-        if (!ctx.TryReadUInt32(fiber + FiberStateOffset, out var state))
+        if (!TryReadUInt32(ctx, fiber + FiberStateOffset, out var state))
         {
-            return ctx.SetReturn(FiberErrorInvalid);
+            return SetReturn(ctx, FiberErrorInvalid);
         }
 
         if (state != FiberStateIdle)
         {
-            return ctx.SetReturn(FiberErrorState);
+            return SetReturn(ctx, FiberErrorState);
         }
 
         _continuations.TryRemove(fiber, out _);
-        _returnTargets.TryRemove(fiber, out _);
         _stackRanges.TryRemove(fiber, out _);
-        _ = ctx.TryWriteUInt32(fiber + FiberStateOffset, FiberStateTerminated);
-        return ctx.SetReturn(0);
+        _ = TryWriteUInt32(ctx, fiber + FiberStateOffset, FiberStateTerminated);
+        return SetReturn(ctx, 0);
     }
 
     [SysAbiExport(
@@ -229,74 +250,47 @@ public static class FiberExports
         var fiberAddress = ResolveCurrentFiberAddress(ctx);
         if (fiberAddress == 0)
         {
-            return ctx.SetReturn(FiberErrorPermission);
+            return SetReturn(ctx, FiberErrorPermission);
         }
 
         if (GuestThreadExecution.Scheduler is not { SupportsGuestContextTransfer: true } ||
             !GuestThreadExecution.TryGetCurrentImportCallFrame(out var frame))
         {
-            return ctx.SetReturn(FiberErrorPermission);
+            return SetReturn(ctx, FiberErrorPermission);
         }
 
         var returnArgument = ctx[CpuRegister.Rdi];
         var argOnRunAddress = ctx[CpuRegister.Rsi];
-        if (argOnRunAddress != 0 && !ctx.TryWriteUInt64(argOnRunAddress, 0))
-        {
-            return ctx.SetReturn(FiberErrorInvalid);
-        }
-
         GuestCpuContinuation transferTarget;
-        ulong previousFiber;
         lock (_fiberGate)
         {
             _continuations[fiberAddress] = new FiberContinuation(
                 CaptureContinuation(ctx, frame.ReturnRip, frame.ResumeRsp, frame.ReturnSlotAddress),
                 argOnRunAddress);
 
-            if (!_returnTargets.TryRemove(fiberAddress, out var returnTarget))
+            var threadKey = GetThreadKey(ctx);
+            if (!_threadStates.TryGetValue(threadKey, out var threadState) ||
+                !TryWriteResumeArgument(ctx, threadState.RootContinuation, returnArgument))
             {
                 _continuations.TryRemove(fiberAddress, out _);
-                return ctx.SetReturn(FiberErrorPermission);
+                return SetReturn(ctx, FiberErrorPermission);
             }
 
-            previousFiber = returnTarget.PreviousFiber;
-            if (previousFiber != 0)
+            if (!TryWriteUInt32(ctx, fiberAddress + FiberStateOffset, FiberStateIdle))
             {
-                if (!_continuations.TryRemove(previousFiber, out var previousContinuation) ||
-                    !TryWriteResumeArgument(ctx, previousContinuation, returnArgument) ||
-                    !ctx.TryWriteUInt32(previousFiber + FiberStateOffset, FiberStateRun))
-                {
-                    _continuations.TryRemove(fiberAddress, out _);
-                    return ctx.SetReturn(FiberErrorState);
-                }
-
-                transferTarget = previousContinuation.Context with { Rax = 0 };
-            }
-            else
-            {
-                if (!returnTarget.ThreadContinuation.HasValue ||
-                    !TryWriteResumeArgument(ctx, returnTarget.ThreadContinuation.Value, returnArgument))
-                {
-                    _continuations.TryRemove(fiberAddress, out _);
-                    return ctx.SetReturn(FiberErrorState);
-                }
-
-                transferTarget = returnTarget.ThreadContinuation.Value.Context with { Rax = 0 };
+                return SetReturn(ctx, FiberErrorInvalid);
             }
 
-            if (!ctx.TryWriteUInt32(fiberAddress + FiberStateOffset, FiberStateIdle))
-            {
-                return ctx.SetReturn(FiberErrorInvalid);
-            }
+            transferTarget = threadState.RootContinuation.Context with { Rax = 0 };
+            _threadStates.TryRemove(threadKey, out _);
         }
 
-        _currentFiberAddress = previousFiber;
-        _ = GuestThreadExecution.EnterFiber(previousFiber);
+        _ = GuestThreadExecution.EnterFiber(0);
         GuestThreadExecution.RequestCurrentContextTransfer(transferTarget);
         TraceFiber(
-            $"return fiber=0x{fiberAddress:X16} to=0x{previousFiber:X16} " +
+            $"return-to-thread fiber=0x{fiberAddress:X16} " +
             $"resume=0x{transferTarget.Rip:X16} rsp=0x{transferTarget.Rsp:X16} arg=0x{returnArgument:X16}");
-        return ctx.SetReturn(0);
+        return SetReturn(ctx, 0);
     }
 
     [SysAbiExport(
@@ -309,18 +303,18 @@ public static class FiberExports
         var outAddress = ctx[CpuRegister.Rdi];
         if (outAddress == 0)
         {
-            return ctx.SetReturn(FiberErrorNull);
+            return SetReturn(ctx, FiberErrorNull);
         }
 
         var fiberAddress = ResolveCurrentFiberAddress(ctx);
         if (fiberAddress == 0)
         {
-            return ctx.SetReturn(FiberErrorPermission);
+            return SetReturn(ctx, FiberErrorPermission);
         }
 
-        return ctx.TryWriteUInt64(outAddress, fiberAddress)
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn(FiberErrorInvalid);
+        return TryWriteUInt64(ctx, outAddress, fiberAddress)
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, FiberErrorInvalid);
     }
 
     [SysAbiExport(
@@ -334,35 +328,35 @@ public static class FiberExports
         var info = ctx[CpuRegister.Rsi];
         if (info == 0)
         {
-            return ctx.SetReturn(FiberErrorNull);
+            return SetReturn(ctx, FiberErrorNull);
         }
 
         if (!TryValidateFiber(ctx, fiber, out var error))
         {
-            return ctx.SetReturn(error);
+            return SetReturn(ctx, error);
         }
 
-        if (!ctx.TryReadUInt64(info, out var size) || size != FiberInfoSize)
+        if (!TryReadUInt64(ctx, info, out var size) || size != FiberInfoSize)
         {
-            return ctx.SetReturn(FiberErrorInvalid);
+            return SetReturn(ctx, FiberErrorInvalid);
         }
 
         if (!TryReadFiberFields(ctx, fiber, out var fields))
         {
-            return ctx.SetReturn(FiberErrorInvalid);
+            return SetReturn(ctx, FiberErrorInvalid);
         }
 
-        if (!ctx.TryWriteUInt64(info + 8, fields.Entry) ||
-            !ctx.TryWriteUInt64(info + 16, fields.ArgOnInitialize) ||
-            !ctx.TryWriteUInt64(info + 24, fields.ContextAddress) ||
-            !ctx.TryWriteUInt64(info + 32, fields.ContextSize) ||
+        if (!TryWriteUInt64(ctx, info + 8, fields.Entry) ||
+            !TryWriteUInt64(ctx, info + 16, fields.ArgOnInitialize) ||
+            !TryWriteUInt64(ctx, info + 24, fields.ContextAddress) ||
+            !TryWriteUInt64(ctx, info + 32, fields.ContextSize) ||
             !TryWriteName(ctx, info + 40, fields.Name) ||
-            !ctx.TryWriteUInt64(info + 72, ulong.MaxValue))
+            !TryWriteUInt64(ctx, info + 72, ulong.MaxValue))
         {
-            return ctx.SetReturn(FiberErrorInvalid);
+            return SetReturn(ctx, FiberErrorInvalid);
         }
 
-        return ctx.SetReturn(0);
+        return SetReturn(ctx, 0);
     }
 
     [SysAbiExport(
@@ -376,22 +370,22 @@ public static class FiberExports
         var nameAddress = ctx[CpuRegister.Rsi];
         if (!TryValidateFiber(ctx, fiber, out var error))
         {
-            return ctx.SetReturn(error);
+            return SetReturn(ctx, error);
         }
 
         if (nameAddress == 0)
         {
-            return ctx.SetReturn(FiberErrorNull);
+            return SetReturn(ctx, FiberErrorNull);
         }
 
-        if (!ctx.TryReadNullTerminatedUtf8(nameAddress, MaxNameLength + 1, out var name))
+        if (!TryReadNullTerminatedUtf8(ctx, nameAddress, MaxNameLength + 1, out var name))
         {
-            return ctx.SetReturn(FiberErrorInvalid);
+            return SetReturn(ctx, FiberErrorInvalid);
         }
 
         return TryWriteName(ctx, fiber + FiberNameOffset, name)
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn(FiberErrorInvalid);
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, FiberErrorInvalid);
     }
 
     [SysAbiExport(
@@ -403,12 +397,12 @@ public static class FiberExports
     {
         if (ctx[CpuRegister.Rdi] != 0)
         {
-            return ctx.SetReturn(FiberErrorInvalid);
+            return SetReturn(ctx, FiberErrorInvalid);
         }
 
         return Interlocked.Exchange(ref _contextSizeCheck, 1) == 0
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn(FiberErrorState);
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, FiberErrorState);
     }
 
     [SysAbiExport(
@@ -419,8 +413,8 @@ public static class FiberExports
     public static int FiberStopContextSizeCheck(CpuContext ctx)
     {
         return Interlocked.Exchange(ref _contextSizeCheck, 0) == 1
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn(FiberErrorState);
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, FiberErrorState);
     }
 
     [SysAbiExport(
@@ -433,17 +427,18 @@ public static class FiberExports
         var outAddress = ctx[CpuRegister.Rdi];
         if (outAddress == 0)
         {
-            return ctx.SetReturn(FiberErrorNull);
+            return SetReturn(ctx, FiberErrorNull);
         }
 
-        if (ResolveCurrentFiberAddress(ctx) == 0)
+        if (ResolveCurrentFiberAddress(ctx) == 0 ||
+            !_threadStates.TryGetValue(GetThreadKey(ctx), out var threadState))
         {
-            return ctx.SetReturn(FiberErrorPermission);
+            return SetReturn(ctx, FiberErrorPermission);
         }
 
-        return ctx.TryWriteUInt64(outAddress, ctx[CpuRegister.Rbp])
-            ? ctx.SetReturn(0)
-            : ctx.SetReturn(FiberErrorInvalid);
+        return TryWriteUInt64(ctx, outAddress, threadState.RootContinuation.Context.Rbp)
+            ? SetReturn(ctx, 0)
+            : SetReturn(ctx, FiberErrorInvalid);
     }
 
     private static int FiberInitializeCore(
@@ -455,69 +450,70 @@ public static class FiberExports
         ulong contextAddress,
         ulong contextSize,
         ulong optParam,
-        uint flags)
+        uint flags,
+        uint buildVersion)
     {
         if (fiber == 0 || nameAddress == 0 || entry == 0)
         {
-            return ctx.SetReturn(FiberErrorNull);
+            return SetReturn(ctx, FiberErrorNull);
         }
 
         if ((fiber & 7) != 0 ||
             (contextAddress & 15) != 0 ||
             (optParam & 7) != 0)
         {
-            return ctx.SetReturn(FiberErrorAlignment);
+            return SetReturn(ctx, FiberErrorAlignment);
         }
 
         if (contextSize != 0 && contextSize < FiberContextMinimumSize)
         {
-            return ctx.SetReturn(FiberErrorRange);
+            return SetReturn(ctx, FiberErrorRange);
         }
 
         if ((contextSize & 15) != 0 ||
             (contextAddress == 0 && contextSize != 0) ||
             (contextAddress != 0 && contextSize == 0))
         {
-            return ctx.SetReturn(FiberErrorInvalid);
+            return SetReturn(ctx, FiberErrorInvalid);
         }
 
         if (optParam != 0 &&
-            (!ctx.TryReadUInt32(optParam, out var optMagic) || optMagic != FiberOptSignature))
+            (!TryReadUInt32(ctx, optParam, out var optMagic) || optMagic != FiberOptSignature))
         {
-            return ctx.SetReturn(FiberErrorInvalid);
+            return SetReturn(ctx, FiberErrorInvalid);
         }
 
-        if (!ctx.TryReadNullTerminatedUtf8(nameAddress, MaxNameLength + 1, out var name))
+        if (!TryReadNullTerminatedUtf8(ctx, nameAddress, MaxNameLength + 1, out var name))
         {
-            return ctx.SetReturn(FiberErrorInvalid);
+            return SetReturn(ctx, FiberErrorInvalid);
         }
 
-        if (Volatile.Read(ref _contextSizeCheck) != 0)
-        {
-            flags |= FiberFlagContextSizeCheck;
-        }
+        flags = ApplyInitializationFlags(
+            flags,
+            buildVersion,
+            Volatile.Read(ref _contextSizeCheck) != 0);
 
-        if (!ctx.TryWriteUInt32(fiber + FiberMagicStartOffset, FiberSignature0) ||
-            !ctx.TryWriteUInt32(fiber + FiberStateOffset, FiberStateIdle) ||
-            !ctx.TryWriteUInt64(fiber + FiberEntryOffset, entry) ||
-            !ctx.TryWriteUInt64(fiber + FiberArgOnInitializeOffset, argOnInitialize) ||
-            !ctx.TryWriteUInt64(fiber + FiberContextAddressOffset, contextAddress) ||
-            !ctx.TryWriteUInt64(fiber + FiberContextSizeOffset, contextSize) ||
+        if (!TryWriteUInt32(ctx, fiber + FiberMagicStartOffset, FiberSignature0) ||
+            !TryWriteUInt32(ctx, fiber + FiberStateOffset, FiberStateIdle) ||
+            !TryWriteUInt64(ctx, fiber + FiberEntryOffset, entry) ||
+            !TryWriteUInt64(ctx, fiber + FiberArgOnInitializeOffset, argOnInitialize) ||
+            !TryWriteUInt64(ctx, fiber + FiberContextAddressOffset, contextAddress) ||
+            !TryWriteUInt64(ctx, fiber + FiberContextSizeOffset, contextSize) ||
             !TryWriteName(ctx, fiber + FiberNameOffset, name) ||
-            !ctx.TryWriteUInt64(fiber + FiberContextPointerOffset, 0) ||
-            !ctx.TryWriteUInt32(fiber + FiberFlagsOffset, flags) ||
-            !ctx.TryWriteUInt64(fiber + FiberContextStartOffset, contextAddress) ||
-            !ctx.TryWriteUInt64(fiber + FiberContextEndOffset, contextAddress == 0 ? 0 : contextAddress + contextSize) ||
-            !ctx.TryWriteUInt32(fiber + FiberMagicEndOffset, FiberSignature1))
+            !TryWriteUInt64(ctx, fiber + FiberContextPointerOffset, 0) ||
+            !TryWriteUInt32(ctx, fiber + FiberFlagsOffset, flags) ||
+            !TryWriteUInt64(ctx, fiber + FiberContextStartOffset, contextAddress) ||
+            !TryWriteUInt64(ctx, fiber + FiberContextEndOffset, contextAddress == 0 ? 0 : contextAddress + contextSize) ||
+            !TryWriteUInt32(ctx, fiber + FiberMagicEndOffset, FiberSignature1))
         {
-            return ctx.SetReturn(FiberErrorInvalid);
+            return SetReturn(ctx, FiberErrorInvalid);
         }
 
         if (contextAddress != 0)
         {
-            if (!ctx.TryWriteUInt64(contextAddress, FiberStackSignature))
+            if (!TryWriteUInt64(ctx, contextAddress, FiberStackSignature))
             {
-                return ctx.SetReturn(FiberErrorInvalid);
+                return SetReturn(ctx, FiberErrorInvalid);
             }
 
             if ((flags & FiberFlagContextSizeCheck) != 0)
@@ -531,8 +527,10 @@ public static class FiberExports
             _stackRanges[fiber] = new FiberStackRange(contextAddress, contextSize);
         }
 
-        TraceFiber($"init fiber=0x{fiber:X16} entry=0x{entry:X16} ctx=0x{contextAddress:X16} size=0x{contextSize:X} name='{name}'");
-        return ctx.SetReturn(0);
+        TraceFiber(
+            $"init fiber=0x{fiber:X16} entry=0x{entry:X16} ctx=0x{contextAddress:X16} " +
+            $"size=0x{contextSize:X} flags=0x{flags:X} build=0x{buildVersion:X8} name='{name}'");
+        return SetReturn(ctx, 0);
     }
 
     private static int FiberRunCore(
@@ -547,12 +545,12 @@ public static class FiberExports
     {
         if (!TryValidateFiber(ctx, fiber, out var error))
         {
-            return ctx.SetReturn(error);
+            return SetReturn(ctx, error);
         }
 
         if (!TryReadFiberFields(ctx, fiber, out var fields))
         {
-            return ctx.SetReturn(FiberErrorInvalid);
+            return SetReturn(ctx, FiberErrorInvalid);
         }
 
         if (attachContextAddress != 0 || attachContextSize != 0)
@@ -560,7 +558,7 @@ public static class FiberExports
             var attachResult = AttachContext(ctx, fiber, attachContextAddress, attachContextSize, ref fields);
             if (attachResult != 0)
             {
-                return ctx.SetReturn(attachResult);
+                return SetReturn(ctx, attachResult);
             }
         }
 
@@ -568,78 +566,96 @@ public static class FiberExports
         if ((isSwitch && previousFiber == 0) ||
             (!isSwitch && previousFiber != 0))
         {
-            return ctx.SetReturn(FiberErrorPermission);
+            return SetReturn(ctx, FiberErrorPermission);
         }
         if (previousFiber == fiber)
         {
-            return ctx.SetReturn(FiberErrorState);
+            return SetReturn(ctx, FiberErrorState);
         }
         if (GuestThreadExecution.Scheduler is not { SupportsGuestContextTransfer: true } ||
             !GuestThreadExecution.TryGetCurrentImportCallFrame(out var frame))
         {
-            return ctx.SetReturn(FiberErrorPermission);
+            return SetReturn(ctx, FiberErrorPermission);
         }
 
         GuestCpuContinuation transferTarget;
         var resumed = false;
         lock (_fiberGate)
         {
+            var threadKey = GetThreadKey(ctx);
             if (!TryReadFiberFields(ctx, fiber, out fields))
             {
-                return ctx.SetReturn(FiberErrorInvalid);
+                return SetReturn(ctx, FiberErrorInvalid);
             }
             if (fields.State != FiberStateIdle)
             {
                 TraceFiber($"run-state-error reason={reason} fiber=0x{fiber:X16} state=0x{fields.State:X8}");
-                return ctx.SetReturn(FiberErrorState);
+                return SetReturn(ctx, FiberErrorState);
             }
 
-            FiberContinuation targetContinuation;
+            FiberContinuation targetContinuation = default;
             if (_continuations.TryGetValue(fiber, out var savedContinuation))
             {
                 targetContinuation = savedContinuation;
                 resumed = true;
             }
-            else if (!TryCreateInitialContinuation(ctx, fields, argOnRun, out targetContinuation))
-            {
-                return ctx.SetReturn(FiberErrorInvalid);
-            }
-
-            if (resumed && !TryWriteResumeArgument(ctx, targetContinuation, argOnRun))
-            {
-                return ctx.SetReturn(FiberErrorInvalid);
-            }
-
             var callerContinuation = new FiberContinuation(
                 CaptureContinuation(ctx, frame.ReturnRip, frame.ResumeRsp, frame.ReturnSlotAddress),
                 outArgumentAddress);
 
+            if (!resumed)
+            {
+                var rootStackTop = _threadStates.TryGetValue(threadKey, out var existingThreadState)
+                    ? existingThreadState.RootContinuation.Context.Rsp
+                    : callerContinuation.Context.Rsp;
+                if (!TryCreateInitialContinuation(
+                        ctx,
+                        fields,
+                        argOnRun,
+                        rootStackTop,
+                        out targetContinuation))
+                {
+                    return SetReturn(ctx, FiberErrorInvalid);
+                }
+            }
+            else if (!TryWriteResumeArgument(ctx, targetContinuation, argOnRun))
+            {
+                return SetReturn(ctx, FiberErrorInvalid);
+            }
+
             if (previousFiber != 0)
             {
-                if (!ctx.TryReadUInt32(previousFiber + FiberStateOffset, out var previousState) ||
+                if (!TryReadUInt32(ctx, previousFiber + FiberStateOffset, out var previousState) ||
                     previousState != FiberStateRun ||
-                    !ctx.TryWriteUInt32(previousFiber + FiberStateOffset, FiberStateIdle))
+                    !TryWriteUInt32(ctx, previousFiber + FiberStateOffset, FiberStateIdle))
                 {
-                    return ctx.SetReturn(FiberErrorState);
+                    return SetReturn(ctx, FiberErrorState);
                 }
 
                 _continuations[previousFiber] = callerContinuation;
-                _returnTargets[fiber] = new FiberReturnTarget(previousFiber, null);
             }
             else
             {
-                _returnTargets[fiber] = new FiberReturnTarget(0, callerContinuation);
+                if (_threadStates.ContainsKey(threadKey))
+                {
+                    return SetReturn(ctx, FiberErrorPermission);
+                }
+
+                _threadStates[threadKey] = new FiberThreadState(callerContinuation, fiber, previousFiber);
             }
 
-            if (!ctx.TryWriteUInt32(fiber + FiberStateOffset, FiberStateRun))
+            if (!TryWriteUInt32(ctx, fiber + FiberStateOffset, FiberStateRun))
             {
                 if (previousFiber != 0)
                 {
                     _continuations.TryRemove(previousFiber, out _);
-                    _ = ctx.TryWriteUInt32(previousFiber + FiberStateOffset, FiberStateRun);
+                    _ = TryWriteUInt32(ctx, previousFiber + FiberStateOffset, FiberStateRun);
                 }
-                _returnTargets.TryRemove(fiber, out _);
-                return ctx.SetReturn(FiberErrorInvalid);
+                else
+                {
+                    _threadStates.TryRemove(threadKey, out _);
+                }
+                return SetReturn(ctx, FiberErrorInvalid);
             }
 
             if (resumed)
@@ -648,35 +664,66 @@ public static class FiberExports
             }
 
             transferTarget = targetContinuation.Context with { Rax = 0 };
+            if (_threadStates.TryGetValue(threadKey, out var activeState))
+            {
+                _threadStates[threadKey] = activeState with
+                {
+                    CurrentFiber = fiber,
+                    PreviousFiber = previousFiber,
+                };
+            }
         }
 
-        _currentFiberAddress = fiber;
         _ = GuestThreadExecution.EnterFiber(fiber);
         GuestThreadExecution.RequestCurrentContextTransfer(transferTarget);
         TraceFiber(
             $"transfer reason={reason} from=0x{previousFiber:X16} to=0x{fiber:X16} resume={resumed} " +
             $"rip=0x{transferTarget.Rip:X16} rsp=0x{transferTarget.Rsp:X16} arg=0x{argOnRun:X16}");
-        return ctx.SetReturn(0);
+        return SetReturn(ctx, 0);
     }
 
     private static bool TryCreateInitialContinuation(
         CpuContext ctx,
         FiberFields fields,
         ulong argOnRun,
+        ulong rootStackTop,
         out FiberContinuation continuation)
     {
         continuation = default;
-        if (fields.ContextAddress == 0 || fields.ContextSize < FiberContextMinimumSize)
+        ulong stackEnd;
+        if (fields.ContextAddress == 0)
+        {
+            if (rootStackTop < 32)
+            {
+                return false;
+            }
+
+            // Contextless fibers are specified to execute on the root
+            // sceFiberRun stack.  Keep the suspended import return record
+            // above the entry stack and use a synthetic transfer slot below it.
+            stackEnd = rootStackTop & ~15UL;
+        }
+        else
+        {
+            if (fields.ContextSize < FiberContextMinimumSize)
+            {
+                return false;
+            }
+
+            stackEnd = fields.ContextAddress + fields.ContextSize;
+        }
+
+        if (!TryCalculateInitialStackLayout(stackEnd, out var entryRsp, out var transferSlot))
+        {
+            return false;
+        }
+        if (!TryWriteUInt64(ctx, transferSlot, fields.Entry) ||
+            !TryWriteUInt64(ctx, entryRsp, 0))
         {
             return false;
         }
 
-        var stackEnd = fields.ContextAddress + fields.ContextSize;
-        var entryRsp = (stackEnd & ~15UL) - sizeof(ulong);
-        if (!ctx.TryWriteUInt64(entryRsp, 0))
-        {
-            return false;
-        }
+        var setFpuRegisters = (fields.Flags & FiberFlagSetFpuRegs) != 0;
 
         continuation = new FiberContinuation(
             new GuestCpuContinuation(
@@ -698,7 +745,12 @@ public static class FiberExports
                 0,
                 0,
                 0,
-                0),
+                0,
+                0,
+                0,
+                setFpuRegisters ? InitialFpuControlWord : ctx.FpuControlWord,
+                setFpuRegisters ? InitialMxcsr : ctx.Mxcsr,
+                RestoreFullFpuState: setFpuRegisters),
             0);
         return true;
     }
@@ -708,7 +760,7 @@ public static class FiberExports
         FiberContinuation continuation,
         ulong argument) =>
         continuation.ArgOnRunAddress == 0 ||
-        ctx.TryWriteUInt64(continuation.ArgOnRunAddress, argument);
+        TryWriteUInt64(ctx, continuation.ArgOnRunAddress, argument);
 
     private static GuestCpuContinuation CaptureContinuation(
         CpuContext ctx,
@@ -731,26 +783,99 @@ public static class FiberExports
             ctx[CpuRegister.Rdi],
             ctx[CpuRegister.R8],
             ctx[CpuRegister.R9],
+            ctx[CpuRegister.R10],
+            ctx[CpuRegister.R11],
             ctx[CpuRegister.R12],
             ctx[CpuRegister.R13],
             ctx[CpuRegister.R14],
-            ctx[CpuRegister.R15]);
+            ctx[CpuRegister.R15],
+            ctx.FpuControlWord,
+            ctx.Mxcsr,
+            RestoreFullFpuState: false);
 
     private static ulong ResolveCurrentFiberAddress(CpuContext ctx)
     {
-        if (_currentFiberAddress != 0)
-        {
-            return _currentFiberAddress;
-        }
-
         if (GuestThreadExecution.CurrentFiberAddress != 0)
         {
             return GuestThreadExecution.CurrentFiberAddress;
         }
 
+        if (_threadStates.TryGetValue(GetThreadKey(ctx), out var threadState) &&
+            threadState.CurrentFiber != 0)
+        {
+            return threadState.CurrentFiber;
+        }
+
         return TryFindFiberByStack(ctx, out var fiberAddress) ? fiberAddress : 0;
     }
 
+    private static ulong GetThreadKey(CpuContext ctx)
+    {
+        var handle = GuestThreadExecution.CurrentGuestThreadHandle;
+        if (handle != 0)
+        {
+            return handle;
+        }
+
+        // The main guest thread does not always have a scheduler handle.  Its
+        // ABI thread pointer is stable across native/managed transitions.
+        return ctx.FsBase != 0 ? ctx.FsBase : 1;
+    }
+
+    private static uint ApplyInitializationFlags(
+        uint flags,
+        uint buildVersion,
+        bool contextSizeCheck)
+    {
+        if (buildVersion >= Firmware350BuildVersion)
+        {
+            flags |= FiberFlagSetFpuRegs;
+        }
+        if (contextSizeCheck)
+        {
+            flags |= FiberFlagContextSizeCheck;
+        }
+
+        return flags;
+    }
+
+    private static bool TryCalculateInitialStackLayout(
+        ulong stackEnd,
+        out ulong entryRsp,
+        out ulong transferSlot)
+    {
+        var alignedEnd = stackEnd & ~15UL;
+        if (alignedEnd < 2 * sizeof(ulong))
+        {
+            entryRsp = 0;
+            transferSlot = 0;
+            return false;
+        }
+
+        entryRsp = alignedEnd - sizeof(ulong);
+        transferSlot = entryRsp - sizeof(ulong);
+        return true;
+    }
+
+    [Conditional("DEBUG")]
+    private static void RunFiberSelfChecks()
+    {
+        Debug.Assert(
+            ApplyInitializationFlags(0, Firmware350BuildVersion - 1, false) == 0,
+            "Pre-3.50 fibers unexpectedly enable SetFpuRegs.");
+        Debug.Assert(
+            ApplyInitializationFlags(0, Firmware350BuildVersion, false) == FiberFlagSetFpuRegs,
+            "3.50+ fibers must initialize x87/MXCSR control state.");
+        Debug.Assert(
+            ApplyInitializationFlags(1, Firmware350BuildVersion, true) ==
+                (1u | FiberFlagSetFpuRegs | FiberFlagContextSizeCheck),
+            "Fiber initialization discarded caller/internal flags.");
+        Debug.Assert(
+            TryCalculateInitialStackLayout(0x1017, out var rsp, out var slot) &&
+            rsp == 0x1008 && slot == 0x1000 && (rsp & 15) == 8,
+            "Initial fiber transfer slot does not produce SysV entry alignment.");
+    }
+
     internal static ulong GetCurrentFiberAddressForDiagnostics(CpuContext ctx) =>
         ResolveCurrentFiberAddress(ctx);
 
@@ -779,11 +904,11 @@ public static class FiberExports
             return FiberErrorInvalid;
         }
 
-        if (!ctx.TryWriteUInt64(fiber + FiberContextAddressOffset, contextAddress) ||
-            !ctx.TryWriteUInt64(fiber + FiberContextSizeOffset, contextSize) ||
-            !ctx.TryWriteUInt64(fiber + FiberContextStartOffset, contextAddress) ||
-            !ctx.TryWriteUInt64(fiber + FiberContextEndOffset, contextAddress + contextSize) ||
-            !ctx.TryWriteUInt64(contextAddress, FiberStackSignature))
+        if (!TryWriteUInt64(ctx, fiber + FiberContextAddressOffset, contextAddress) ||
+            !TryWriteUInt64(ctx, fiber + FiberContextSizeOffset, contextSize) ||
+            !TryWriteUInt64(ctx, fiber + FiberContextStartOffset, contextAddress) ||
+            !TryWriteUInt64(ctx, fiber + FiberContextEndOffset, contextAddress + contextSize) ||
+            !TryWriteUInt64(ctx, contextAddress, FiberStackSignature))
         {
             return FiberErrorInvalid;
         }
@@ -839,8 +964,8 @@ public static class FiberExports
             return false;
         }
 
-        if (!ctx.TryReadUInt32(fiber + FiberMagicStartOffset, out var magicStart) ||
-            !ctx.TryReadUInt32(fiber + FiberMagicEndOffset, out var magicEnd) ||
+        if (!TryReadUInt32(ctx, fiber + FiberMagicStartOffset, out var magicStart) ||
+            !TryReadUInt32(ctx, fiber + FiberMagicEndOffset, out var magicEnd) ||
             magicStart != FiberSignature0 ||
             magicEnd != FiberSignature1)
         {
@@ -855,12 +980,12 @@ public static class FiberExports
     private static bool TryReadFiberFields(CpuContext ctx, ulong fiber, out FiberFields fields)
     {
         fields = default;
-        if (!ctx.TryReadUInt32(fiber + FiberStateOffset, out var state) ||
-            !ctx.TryReadUInt64(fiber + FiberEntryOffset, out var entry) ||
-            !ctx.TryReadUInt64(fiber + FiberArgOnInitializeOffset, out var argOnInitialize) ||
-            !ctx.TryReadUInt64(fiber + FiberContextAddressOffset, out var contextAddress) ||
-            !ctx.TryReadUInt64(fiber + FiberContextSizeOffset, out var contextSize) ||
-            !ctx.TryReadUInt32(fiber + FiberFlagsOffset, out var flags) ||
+        if (!TryReadUInt32(ctx, fiber + FiberStateOffset, out var state) ||
+            !TryReadUInt64(ctx, fiber + FiberEntryOffset, out var entry) ||
+            !TryReadUInt64(ctx, fiber + FiberArgOnInitializeOffset, out var argOnInitialize) ||
+            !TryReadUInt64(ctx, fiber + FiberContextAddressOffset, out var contextAddress) ||
+            !TryReadUInt64(ctx, fiber + FiberContextSizeOffset, out var contextSize) ||
+            !TryReadUInt32(ctx, fiber + FiberFlagsOffset, out var flags) ||
             !TryReadInlineName(ctx, fiber + FiberNameOffset, out var name))
         {
             return false;
@@ -898,6 +1023,46 @@ public static class FiberExports
         return 0;
     }
 
+    private static bool TryReadUInt32(CpuContext ctx, ulong address, out uint value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(uint)];
+        if (!ctx.Memory.TryRead(address, buffer))
+        {
+            value = 0;
+            return false;
+        }
+
+        value = BinaryPrimitives.ReadUInt32LittleEndian(buffer);
+        return true;
+    }
+
+    private static bool TryWriteUInt32(CpuContext ctx, ulong address, uint value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(uint)];
+        BinaryPrimitives.WriteUInt32LittleEndian(buffer, value);
+        return ctx.Memory.TryWrite(address, buffer);
+    }
+
+    private static bool TryReadUInt64(CpuContext ctx, ulong address, out ulong value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(ulong)];
+        if (!ctx.Memory.TryRead(address, buffer))
+        {
+            value = 0;
+            return false;
+        }
+
+        value = BinaryPrimitives.ReadUInt64LittleEndian(buffer);
+        return true;
+    }
+
+    private static bool TryWriteUInt64(CpuContext ctx, ulong address, ulong value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(ulong)];
+        BinaryPrimitives.WriteUInt64LittleEndian(buffer, value);
+        return ctx.Memory.TryWrite(address, buffer);
+    }
+
     private static bool TryWriteName(CpuContext ctx, ulong address, string name)
     {
         Span<byte> buffer = stackalloc byte[MaxNameLength + 1];
@@ -925,6 +1090,37 @@ public static class FiberExports
         return true;
     }
 
+    private static bool TryReadNullTerminatedUtf8(CpuContext ctx, ulong address, int capacity, out string value)
+    {
+        var bytes = new byte[capacity];
+        Span<byte> current = stackalloc byte[1];
+        for (var index = 0; index < bytes.Length; index++)
+        {
+            if (!ctx.Memory.TryRead(address + (ulong)index, current))
+            {
+                value = string.Empty;
+                return false;
+            }
+
+            if (current[0] == 0)
+            {
+                value = Encoding.UTF8.GetString(bytes, 0, index);
+                return true;
+            }
+
+            bytes[index] = current[0];
+        }
+
+        value = Encoding.UTF8.GetString(bytes);
+        return true;
+    }
+
+    private static int SetReturn(CpuContext ctx, int result)
+    {
+        ctx[CpuRegister.Rax] = unchecked((ulong)result);
+        return result;
+    }
+
     private static void TraceFiber(string message)
     {
         if (string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_FIBER"), "1", StringComparison.Ordinal))
@@ -946,9 +1142,10 @@ public static class FiberExports
         GuestCpuContinuation Context,
         ulong ArgOnRunAddress);
 
-    private readonly record struct FiberReturnTarget(
-        ulong PreviousFiber,
-        FiberContinuation? ThreadContinuation);
+    private sealed record FiberThreadState(
+        FiberContinuation RootContinuation,
+        ulong CurrentFiber,
+        ulong PreviousFiber);
 
     private readonly record struct FiberStackRange(ulong Start, ulong Size)
     {

src/SharpEmu.Libs/Font/FontExports.cs

@@ -0,0 +1,372 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Buffers.Binary;
+using SharpEmu.HLE;
+
+namespace SharpEmu.Libs.Font;
+
+public static class FontExports
+{
+    private static readonly object AllocationGate = new();
+    private static ulong _librarySelectionAddress;
+    private static ulong _rendererSelectionAddress;
+
+    [SysAbiExport(
+        Nid = "whrS4oksXc4",
+        ExportName = "sceFontMemoryInit",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int MemoryInit(CpuContext ctx)
+    {
+        var descriptorAddress = ctx[CpuRegister.Rdi];
+        var regionAddress = ctx[CpuRegister.Rsi];
+        var regionSize = (uint)ctx[CpuRegister.Rdx];
+        var interfaceAddress = ctx[CpuRegister.Rcx];
+        var mspaceAddress = ctx[CpuRegister.R8];
+        var destroyCallback = ctx[CpuRegister.R9];
+        if (descriptorAddress == 0 ||
+            !TryWriteUInt32(ctx, descriptorAddress, 0x00000F00) ||
+            !TryWriteUInt32(ctx, descriptorAddress + 0x04, regionSize) ||
+            !ctx.TryWriteUInt64(descriptorAddress + 0x08, regionAddress) ||
+            !ctx.TryWriteUInt64(descriptorAddress + 0x10, mspaceAddress) ||
+            !ctx.TryWriteUInt64(descriptorAddress + 0x18, interfaceAddress) ||
+            !ctx.TryWriteUInt64(descriptorAddress + 0x20, destroyCallback) ||
+            !ctx.TryWriteUInt64(descriptorAddress + 0x28, 0) ||
+            !ctx.TryWriteUInt64(descriptorAddress + 0x30, 0) ||
+            !ctx.TryWriteUInt64(descriptorAddress + 0x38, mspaceAddress))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        }
+
+        return SetSuccess(ctx);
+    }
+
+    [SysAbiExport(
+        Nid = "oM+XCzVG3oM",
+        ExportName = "sceFontSelectLibraryFt",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFontFt")]
+    public static int SelectLibraryFt(CpuContext ctx) =>
+        ReturnSelection(ctx, ref _librarySelectionAddress, 0x38);
+
+    [SysAbiExport(
+        Nid = "Xx974EW-QFY",
+        ExportName = "sceFontSelectRendererFt",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFontFt")]
+    public static int SelectRendererFt(CpuContext ctx) =>
+        ReturnSelection(ctx, ref _rendererSelectionAddress, 0x100);
+
+    [SysAbiExport(
+        Nid = "n590hj5Oe-k",
+        ExportName = "sceFontCreateLibraryWithEdition",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int CreateLibraryWithEdition(CpuContext ctx) =>
+        CreateOpaqueHandle(ctx, ctx[CpuRegister.Rcx], 0x100, magic: 0x0F01);
+
+    [SysAbiExport(
+        Nid = "WaSFJoRWXaI",
+        ExportName = "sceFontCreateRendererWithEdition",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int CreateRendererWithEdition(CpuContext ctx) =>
+        CreateOpaqueHandle(ctx, ctx[CpuRegister.Rcx], 0x100, magic: 0x0F07);
+
+    [SysAbiExport(
+        Nid = "3OdRkSjOcog",
+        ExportName = "sceFontBindRenderer",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int BindRenderer(CpuContext ctx) => SetSuccess(ctx);
+
+    [SysAbiExport(
+        Nid = "N1EBMeGhf7E",
+        ExportName = "sceFontSetScalePixel",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int SetScalePixel(CpuContext ctx) => SetSuccess(ctx);
+
+    [SysAbiExport(
+        Nid = "TMtqoFQjjbA",
+        ExportName = "sceFontSetEffectSlant",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int SetEffectSlant(CpuContext ctx) => SetSuccess(ctx);
+
+    [SysAbiExport(
+        Nid = "v0phZwa4R5o",
+        ExportName = "sceFontSetEffectWeight",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int SetEffectWeight(CpuContext ctx) => SetSuccess(ctx);
+
+    [SysAbiExport(
+        Nid = "6vGCkkQJOcI",
+        ExportName = "sceFontSetupRenderScalePixel",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int SetupRenderScalePixel(CpuContext ctx) => SetSuccess(ctx);
+
+    [SysAbiExport(
+        Nid = "lz9y9UFO2UU",
+        ExportName = "sceFontSetupRenderEffectSlant",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int SetupRenderEffectSlant(CpuContext ctx) => SetSuccess(ctx);
+
+    [SysAbiExport(
+        Nid = "XIGorvLusDQ",
+        ExportName = "sceFontSetupRenderEffectWeight",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int SetupRenderEffectWeight(CpuContext ctx) => SetSuccess(ctx);
+
+    [SysAbiExport(
+        Nid = "imxVx8lm+KM",
+        ExportName = "sceFontGetHorizontalLayout",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int GetHorizontalLayout(CpuContext ctx)
+    {
+        var layoutAddress = ctx[CpuRegister.Rsi];
+        if (layoutAddress == 0)
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        // Baseline, line advance, decoration extent: the same invented geometry
+        // as GetRenderCharGlyphMetrics.
+        var values = new[] { 12.0f, 16.0f, 0.0f };
+        for (var index = 0; index < values.Length; index++)
+        {
+            if (!TryWriteUInt32(
+                    ctx,
+                    layoutAddress + (ulong)(index * sizeof(float)),
+                    BitConverter.SingleToUInt32Bits(values[index])))
+            {
+                return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+            }
+        }
+
+        return SetSuccess(ctx);
+    }
+
+    [SysAbiExport(
+        Nid = "cKYtVmeSTcw",
+        ExportName = "sceFontOpenFontSet",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int OpenFontSet(CpuContext ctx) =>
+        CreateOpaqueHandle(ctx, ctx[CpuRegister.R8], 0x100, magic: 0x0F02);
+
+    [SysAbiExport(
+        Nid = "KXUpebrFk1U",
+        ExportName = "sceFontOpenFontMemory",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int OpenFontMemory(CpuContext ctx) =>
+        CreateOpaqueHandle(ctx, ctx[CpuRegister.R8], 0x100, magic: 0x0F02);
+
+    [SysAbiExport(
+        Nid = "JzCH3SCFnAU",
+        ExportName = "sceFontOpenFontInstance",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int OpenFontInstance(CpuContext ctx)
+    {
+        var sourceHandle = ctx[CpuRegister.Rdi];
+        var setupHandle = ctx[CpuRegister.Rsi];
+        var outputAddress = ctx[CpuRegister.Rdx];
+        if (outputAddress == 0)
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        if (setupHandle != 0)
+        {
+            return ctx.TryWriteUInt64(outputAddress, setupHandle)
+                ? SetSuccess(ctx)
+                : SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        }
+
+        if (!TryAllocateOpaque(ctx, 0x100, out var handle))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        }
+
+        if (sourceHandle != 0)
+        {
+            Span<byte> source = stackalloc byte[0x100];
+            if (ctx.Memory.TryRead(sourceHandle, source))
+            {
+                _ = ctx.Memory.TryWrite(handle, source);
+            }
+        }
+
+        _ = TryWriteUInt16(ctx, handle, 0x0F02);
+        return ctx.TryWriteUInt64(outputAddress, handle)
+            ? SetSuccess(ctx)
+            : SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+    }
+
+    [SysAbiExport(
+        Nid = "SsRbbCiWoGw",
+        ExportName = "sceFontSupportSystemFonts",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int SupportSystemFonts(CpuContext ctx) => SetSuccess(ctx);
+
+    [SysAbiExport(
+        Nid = "mz2iTY0MK4A",
+        ExportName = "sceFontSupportExternalFonts",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int SupportExternalFonts(CpuContext ctx) => SetSuccess(ctx);
+
+    [SysAbiExport(
+        Nid = "CUKn5pX-NVY",
+        ExportName = "sceFontAttachDeviceCacheBuffer",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int AttachDeviceCacheBuffer(CpuContext ctx) => SetSuccess(ctx);
+
+    [SysAbiExport(
+        Nid = "IQtleGLL5pQ",
+        ExportName = "sceFontGetRenderCharGlyphMetrics",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int GetRenderCharGlyphMetrics(CpuContext ctx)
+    {
+        var metricsAddress = ctx[CpuRegister.Rdx];
+        if (metricsAddress == 0)
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        var values = new[] { 8.0f, 16.0f, 0.0f, 12.0f, 8.0f, 0.0f, 0.0f, 16.0f };
+        for (var index = 0; index < values.Length; index++)
+        {
+            if (!TryWriteUInt32(
+                    ctx,
+                    metricsAddress + (ulong)(index * sizeof(float)),
+                    BitConverter.SingleToUInt32Bits(values[index])))
+            {
+                return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+            }
+        }
+
+        return SetSuccess(ctx);
+    }
+
+    [SysAbiExport(
+        Nid = "gdUCnU0gHdI",
+        ExportName = "sceFontRenderSurfaceInit",
+        Target = Generation.Gen5,
+        LibraryName = "libSceFont")]
+    public static int RenderSurfaceInit(CpuContext ctx)
+    {
+        var surfaceAddress = ctx[CpuRegister.Rdi];
+        var bufferAddress = ctx[CpuRegister.Rsi];
+        var widthBytes = (uint)ctx[CpuRegister.Rdx];
+        var pixelBytes = (uint)ctx[CpuRegister.Rcx] & 0xFF;
+        var width = (uint)ctx[CpuRegister.R8];
+        var height = (uint)ctx[CpuRegister.R9];
+        if (surfaceAddress == 0 ||
+            !ctx.TryWriteUInt64(surfaceAddress, bufferAddress) ||
+            !TryWriteUInt32(ctx, surfaceAddress + 0x08, widthBytes) ||
+            !TryWriteUInt32(ctx, surfaceAddress + 0x0C, pixelBytes) ||
+            !TryWriteUInt32(ctx, surfaceAddress + 0x10, width) ||
+            !TryWriteUInt32(ctx, surfaceAddress + 0x14, height) ||
+            !TryWriteUInt32(ctx, surfaceAddress + 0x18, 0) ||
+            !TryWriteUInt32(ctx, surfaceAddress + 0x1C, 0) ||
+            !TryWriteUInt32(ctx, surfaceAddress + 0x20, width) ||
+            !TryWriteUInt32(ctx, surfaceAddress + 0x24, height))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        }
+
+        return SetSuccess(ctx);
+    }
+
+    private static int ReturnSelection(CpuContext ctx, ref ulong selectionAddress, uint objectSize)
+    {
+        if (ctx[CpuRegister.Rdi] != 0)
+        {
+            ctx[CpuRegister.Rax] = 0;
+            return 0;
+        }
+
+        lock (AllocationGate)
+        {
+            if (selectionAddress == 0)
+            {
+                if (!TryAllocateOpaque(ctx, 0x20, out selectionAddress) ||
+                    !TryWriteUInt32(ctx, selectionAddress, 0) ||
+                    !TryWriteUInt32(ctx, selectionAddress + 4, objectSize))
+                {
+                    selectionAddress = 0;
+                }
+            }
+        }
+
+        ctx[CpuRegister.Rax] = selectionAddress;
+        return 0;
+    }
+
+    private static int CreateOpaqueHandle(CpuContext ctx, ulong outputAddress, int size, ushort magic)
+    {
+        if (outputAddress == 0 || !TryAllocateOpaque(ctx, size, out var handle))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        }
+
+        if (!TryWriteUInt16(ctx, handle, magic) || !ctx.TryWriteUInt64(outputAddress, handle))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        }
+
+        return SetSuccess(ctx);
+    }
+
+    private static bool TryAllocateOpaque(CpuContext ctx, int size, out ulong address)
+    {
+        address = 0;
+        if (ctx.Memory is not IGuestMemoryAllocator allocator ||
+            !allocator.TryAllocateGuestMemory((ulong)size, 0x10, out address))
+        {
+            return false;
+        }
+
+        Span<byte> bytes = stackalloc byte[size];
+        bytes.Clear();
+        return ctx.Memory.TryWrite(address, bytes);
+    }
+
+    private static bool TryWriteUInt16(CpuContext ctx, ulong address, ushort value)
+    {
+        Span<byte> bytes = stackalloc byte[sizeof(ushort)];
+        BinaryPrimitives.WriteUInt16LittleEndian(bytes, value);
+        return ctx.Memory.TryWrite(address, bytes);
+    }
+
+    private static bool TryWriteUInt32(CpuContext ctx, ulong address, uint value)
+    {
+        Span<byte> bytes = stackalloc byte[sizeof(uint)];
+        BinaryPrimitives.WriteUInt32LittleEndian(bytes, value);
+        return ctx.Memory.TryWrite(address, bytes);
+    }
+
+    private static int SetSuccess(CpuContext ctx)
+    {
+        ctx[CpuRegister.Rax] = 0;
+        return 0;
+    }
+
+    private static int SetReturn(CpuContext ctx, OrbisGen2Result result)
+    {
+        ctx[CpuRegister.Rax] = unchecked((ulong)(int)result);
+        return (int)result;
+    }
+}

src/SharpEmu.Libs/Gpu/GuestGpuTypes.cs

@@ -22,6 +22,8 @@ internal sealed record GuestDrawTexture(
     bool IsStorage,
     uint MipLevels = 1,
     uint MipLevel = 0,
+    uint BaseMipLevel = 0,
+    uint ResourceMipLevels = 1,
     uint Pitch = 0,
     uint TileMode = 0,
     uint DstSelect = 0xFAC,
@@ -36,7 +38,11 @@ internal readonly record struct GuestSampler(
 
 internal sealed record GuestMemoryBuffer(
     ulong BaseAddress,
-    byte[] Data);
+    byte[] Data,
+    int Length,
+    bool Pooled,
+    bool Writable = false,
+    bool WriteBackToGuest = true);
 
 /// <summary>DataFormat/NumberFormat are raw guest vertex-attribute codes.</summary>
 internal sealed record GuestVertexBuffer(
@@ -47,11 +53,15 @@ internal sealed record GuestVertexBuffer(
     ulong BaseAddress,
     uint Stride,
     uint OffsetBytes,
-    byte[] Data);
+    byte[] Data,
+    int Length,
+    bool Pooled);
 
 internal sealed record GuestIndexBuffer(
     byte[] Data,
-    bool Is32Bit);
+    int Length,
+    bool Is32Bit,
+    bool Pooled);
 
 internal readonly record struct GuestRect(
     int X,
@@ -67,6 +77,26 @@ internal readonly record struct GuestViewport(
     float MinDepth,
     float MaxDepth);
 
+internal readonly record struct GuestRasterState(
+    bool CullFront,
+    bool CullBack,
+    bool FrontFaceClockwise,
+    bool Wireframe)
+{
+    public static GuestRasterState Default { get; } = new(false, false, false, false);
+}
+
+// CompareOp uses the GCN DB_DEPTH_CONTROL ZFUNC encoding, which matches the
+// Vulkan CompareOp ordering (0=Never through 7=Always).
+internal readonly record struct GuestDepthState(
+    bool TestEnable,
+    bool WriteEnable,
+    uint CompareOp,
+    bool ClearEnable = false)
+{
+    public static GuestDepthState Default { get; } = new(false, false, 7, false);
+}
+
 /// <summary>Factors/funcs are raw guest CB_BLEND*_CONTROL register bitfields; the
 /// defaults (1/0) are the guest ONE/ZERO codes.</summary>
 internal readonly record struct GuestBlendState(
@@ -95,12 +125,16 @@ internal readonly record struct GuestBlendState(
 internal sealed record GuestRenderState(
     IReadOnlyList<GuestBlendState> Blends,
     GuestRect? Scissor,
-    GuestViewport? Viewport)
+    GuestViewport? Viewport,
+    GuestRasterState Raster,
+    GuestDepthState Depth)
 {
     public static GuestRenderState Default { get; } = new(
         [GuestBlendState.Default],
         Scissor: null,
-        Viewport: null);
+        Viewport: null,
+        GuestRasterState.Default,
+        GuestDepthState.Default);
 
     public GuestBlendState Blend =>
         Blends.Count == 0 ? GuestBlendState.Default : Blends[0];
@@ -114,3 +148,17 @@ internal sealed record GuestRenderTarget(
     uint Format,
     uint NumberType,
     uint MipLevels = 1);
+
+/// <summary>Guest DB surface bound alongside a color render target.</summary>
+internal sealed record GuestDepthTarget(
+    ulong ReadAddress,
+    ulong WriteAddress,
+    uint Width,
+    uint Height,
+    uint GuestFormat,
+    uint SwizzleMode,
+    float ClearDepth,
+    bool ReadOnly)
+{
+    public ulong Address => WriteAddress != 0 ? WriteAddress : ReadAddress;
+}

src/SharpEmu.Libs/Gpu/IGuestGpuBackend.cs

@@ -33,7 +33,9 @@ internal interface IGuestGpuBackend
         int globalBufferBase = 0,
         int totalGlobalBufferCount = -1,
         int imageBindingBase = 0,
-        int scalarRegisterBufferIndex = -1);
+        int scalarRegisterBufferIndex = -1,
+        int requiredVertexOutputCount = 0,
+        ulong storageBufferOffsetAlignment = 1);
 
     bool TryCompilePixelShader(
         Gen5ShaderState state,
@@ -44,7 +46,10 @@ internal interface IGuestGpuBackend
         int globalBufferBase = 0,
         int totalGlobalBufferCount = -1,
         int imageBindingBase = 0,
-        int scalarRegisterBufferIndex = -1);
+        int scalarRegisterBufferIndex = -1,
+        uint pixelInputEnable = 0,
+        uint pixelInputAddress = 0,
+        ulong storageBufferOffsetAlignment = 1);
 
     bool TryCompileComputeShader(
         Gen5ShaderState state,
@@ -53,7 +58,14 @@ internal interface IGuestGpuBackend
         uint localSizeY,
         uint localSizeZ,
         out IGuestCompiledShader? shader,
-        out string error);
+        out string error,
+        int totalGlobalBufferCount = -1,
+        int initialScalarBufferIndex = -1,
+        uint waveLaneCount = 32,
+        ulong storageBufferOffsetAlignment = 1);
+
+    /// <summary>Returns the backend's no-color-output fragment shader.</summary>
+    IGuestCompiledShader GetDepthOnlyFragmentShader();
 
     void HideSplashScreen();
 
@@ -78,6 +90,21 @@ internal interface IGuestGpuBackend
         IReadOnlyList<GuestVertexBuffer>? vertexBuffers = null,
         GuestRenderState? renderState = null);
 
+    void SubmitDepthOnlyTranslatedDraw(
+        IGuestCompiledShader pixelShader,
+        IReadOnlyList<GuestDrawTexture> textures,
+        IReadOnlyList<GuestMemoryBuffer> globalMemoryBuffers,
+        uint attributeCount,
+        GuestDepthTarget depthTarget,
+        IGuestCompiledShader? vertexShader = null,
+        uint vertexCount = 3,
+        uint instanceCount = 1,
+        uint primitiveType = 4,
+        GuestIndexBuffer? indexBuffer = null,
+        IReadOnlyList<GuestVertexBuffer>? vertexBuffers = null,
+        GuestRenderState? renderState = null,
+        ulong shaderAddress = 0);
+
     void SubmitOffscreenTranslatedDraw(
         IGuestCompiledShader pixelShader,
         IReadOnlyList<GuestDrawTexture> textures,
@@ -90,7 +117,9 @@ internal interface IGuestGpuBackend
         uint primitiveType = 4,
         GuestIndexBuffer? indexBuffer = null,
         IReadOnlyList<GuestVertexBuffer>? vertexBuffers = null,
-        GuestRenderState? renderState = null);
+        GuestRenderState? renderState = null,
+        GuestDepthTarget? depthTarget = null,
+        ulong shaderAddress = 0);
 
     void SubmitStorageTranslatedDraw(
         IGuestCompiledShader pixelShader,
@@ -98,16 +127,28 @@ internal interface IGuestGpuBackend
         IReadOnlyList<GuestMemoryBuffer> globalMemoryBuffers,
         uint attributeCount,
         uint width,
-        uint height);
+        uint height,
+        ulong shaderAddress = 0);
 
-    void SubmitComputeDispatch(
+    long SubmitComputeDispatch(
         ulong shaderAddress,
         IGuestCompiledShader computeShader,
         IReadOnlyList<GuestDrawTexture> textures,
         IReadOnlyList<GuestMemoryBuffer> globalMemoryBuffers,
         uint groupCountX,
         uint groupCountY,
-        uint groupCountZ);
+        uint groupCountZ,
+        uint baseGroupX,
+        uint baseGroupY,
+        uint baseGroupZ,
+        uint localSizeX,
+        uint localSizeY,
+        uint localSizeZ,
+        bool isIndirect,
+        bool writesGlobalMemory,
+        uint threadCountX = uint.MaxValue,
+        uint threadCountY = uint.MaxValue,
+        uint threadCountZ = uint.MaxValue);
 
     bool TrySubmitGuestImage(
         ulong address,
@@ -115,6 +156,14 @@ internal interface IGuestGpuBackend
         uint height,
         uint pitchInPixel);
 
+    bool TrySubmitOrderedGuestImageFlip(
+        int videoOutHandle,
+        int displayBufferIndex,
+        ulong address,
+        uint width,
+        uint height,
+        uint pitchInPixel);
+
     /// <summary>Registers a display buffer with its guest texture format tag.</summary>
     void RegisterKnownDisplayBuffer(ulong address, uint guestFormat);
 
@@ -126,10 +175,12 @@ internal interface IGuestGpuBackend
         uint sourceWidth,
         uint sourceHeight,
         uint sourceFormat,
+        uint sourceNumberType,
         ulong destinationAddress,
         uint destinationWidth,
         uint destinationHeight,
-        uint destinationFormat);
+        uint destinationFormat,
+        uint destinationNumberType);
 
     /// <summary>
     /// Whether the backend supports the guest render-target format, and how its pixel

src/SharpEmu.Libs/Gpu/Vulkan/VulkanGuestGpuBackend.cs

@@ -15,6 +15,9 @@ namespace SharpEmu.Libs.Gpu.Vulkan;
 /// </summary>
 internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
 {
+    private static readonly IGuestCompiledShader DepthOnlyFragmentShader =
+        new VulkanCompiledGuestShader(SpirvFixedShaders.CreateDepthOnlyFragment());
+
     public bool TryCompileVertexShader(
         Gen5ShaderState state,
         Gen5ShaderEvaluation evaluation,
@@ -23,7 +26,9 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
         int globalBufferBase = 0,
         int totalGlobalBufferCount = -1,
         int imageBindingBase = 0,
-        int scalarRegisterBufferIndex = -1)
+        int scalarRegisterBufferIndex = -1,
+        int requiredVertexOutputCount = 0,
+        ulong storageBufferOffsetAlignment = 1)
     {
         shader = null;
         if (!Gen5SpirvTranslator.TryCompileVertexShader(
@@ -34,7 +39,9 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
                 globalBufferBase,
                 totalGlobalBufferCount,
                 imageBindingBase,
-                scalarRegisterBufferIndex))
+                scalarRegisterBufferIndex,
+                requiredVertexOutputCount,
+                storageBufferOffsetAlignment))
         {
             return false;
         }
@@ -52,7 +59,10 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
         int globalBufferBase = 0,
         int totalGlobalBufferCount = -1,
         int imageBindingBase = 0,
-        int scalarRegisterBufferIndex = -1)
+        int scalarRegisterBufferIndex = -1,
+        uint pixelInputEnable = 0,
+        uint pixelInputAddress = 0,
+        ulong storageBufferOffsetAlignment = 1)
     {
         shader = null;
         if (!Gen5SpirvTranslator.TryCompilePixelShader(
@@ -64,7 +74,10 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
                 globalBufferBase,
                 totalGlobalBufferCount,
                 imageBindingBase,
-                scalarRegisterBufferIndex))
+                scalarRegisterBufferIndex,
+                pixelInputEnable,
+                pixelInputAddress,
+                storageBufferOffsetAlignment))
         {
             return false;
         }
@@ -80,7 +93,11 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
         uint localSizeY,
         uint localSizeZ,
         out IGuestCompiledShader? shader,
-        out string error)
+        out string error,
+        int totalGlobalBufferCount = -1,
+        int initialScalarBufferIndex = -1,
+        uint waveLaneCount = 32,
+        ulong storageBufferOffsetAlignment = 1)
     {
         shader = null;
         if (!Gen5SpirvTranslator.TryCompileComputeShader(
@@ -90,7 +107,11 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
                 localSizeY,
                 localSizeZ,
                 out var compiled,
-                out error))
+                out error,
+                totalGlobalBufferCount,
+                initialScalarBufferIndex,
+                waveLaneCount,
+                storageBufferOffsetAlignment))
         {
             return false;
         }
@@ -99,6 +120,9 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
         return true;
     }
 
+    public IGuestCompiledShader GetDepthOnlyFragmentShader() =>
+        DepthOnlyFragmentShader;
+
     public void EnsureStarted(uint width, uint height) =>
         VulkanVideoPresenter.EnsureStarted(width, height);
 
@@ -140,6 +164,35 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
             vertexBuffers,
             renderState);
 
+    public void SubmitDepthOnlyTranslatedDraw(
+        IGuestCompiledShader pixelShader,
+        IReadOnlyList<GuestDrawTexture> textures,
+        IReadOnlyList<GuestMemoryBuffer> globalMemoryBuffers,
+        uint attributeCount,
+        GuestDepthTarget depthTarget,
+        IGuestCompiledShader? vertexShader = null,
+        uint vertexCount = 3,
+        uint instanceCount = 1,
+        uint primitiveType = 4,
+        GuestIndexBuffer? indexBuffer = null,
+        IReadOnlyList<GuestVertexBuffer>? vertexBuffers = null,
+        GuestRenderState? renderState = null,
+        ulong shaderAddress = 0) =>
+        VulkanVideoPresenter.SubmitDepthOnlyTranslatedDraw(
+            Spirv(pixelShader),
+            textures,
+            globalMemoryBuffers,
+            attributeCount,
+            depthTarget,
+            vertexShader is null ? null : Spirv(vertexShader),
+            vertexCount,
+            instanceCount,
+            primitiveType,
+            indexBuffer,
+            vertexBuffers,
+            renderState,
+            shaderAddress);
+
     public void SubmitOffscreenTranslatedDraw(
         IGuestCompiledShader pixelShader,
         IReadOnlyList<GuestDrawTexture> textures,
@@ -152,7 +205,9 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
         uint primitiveType = 4,
         GuestIndexBuffer? indexBuffer = null,
         IReadOnlyList<GuestVertexBuffer>? vertexBuffers = null,
-        GuestRenderState? renderState = null) =>
+        GuestRenderState? renderState = null,
+        GuestDepthTarget? depthTarget = null,
+        ulong shaderAddress = 0) =>
         VulkanVideoPresenter.SubmitOffscreenTranslatedDraw(
             Spirv(pixelShader),
             textures,
@@ -165,7 +220,9 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
             primitiveType,
             indexBuffer,
             vertexBuffers,
-            renderState);
+            renderState,
+            depthTarget,
+            shaderAddress);
 
     public void SubmitStorageTranslatedDraw(
         IGuestCompiledShader pixelShader,
@@ -173,23 +230,36 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
         IReadOnlyList<GuestMemoryBuffer> globalMemoryBuffers,
         uint attributeCount,
         uint width,
-        uint height) =>
+        uint height,
+        ulong shaderAddress = 0) =>
         VulkanVideoPresenter.SubmitStorageTranslatedDraw(
             Spirv(pixelShader),
             textures,
             globalMemoryBuffers,
             attributeCount,
             width,
-            height);
+            height,
+            shaderAddress);
 
-    public void SubmitComputeDispatch(
+    public long SubmitComputeDispatch(
         ulong shaderAddress,
         IGuestCompiledShader computeShader,
         IReadOnlyList<GuestDrawTexture> textures,
         IReadOnlyList<GuestMemoryBuffer> globalMemoryBuffers,
         uint groupCountX,
         uint groupCountY,
-        uint groupCountZ) =>
+        uint groupCountZ,
+        uint baseGroupX,
+        uint baseGroupY,
+        uint baseGroupZ,
+        uint localSizeX,
+        uint localSizeY,
+        uint localSizeZ,
+        bool isIndirect,
+        bool writesGlobalMemory,
+        uint threadCountX = uint.MaxValue,
+        uint threadCountY = uint.MaxValue,
+        uint threadCountZ = uint.MaxValue) =>
         VulkanVideoPresenter.SubmitComputeDispatch(
             shaderAddress,
             Spirv(computeShader),
@@ -197,7 +267,18 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
             globalMemoryBuffers,
             groupCountX,
             groupCountY,
-            groupCountZ);
+            groupCountZ,
+            baseGroupX,
+            baseGroupY,
+            baseGroupZ,
+            localSizeX,
+            localSizeY,
+            localSizeZ,
+            isIndirect,
+            writesGlobalMemory,
+            threadCountX,
+            threadCountY,
+            threadCountZ);
 
     public bool TrySubmitGuestImage(
         ulong address,
@@ -206,6 +287,21 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
         uint pitchInPixel) =>
         VulkanVideoPresenter.TrySubmitGuestImage(address, width, height, pitchInPixel);
 
+    public bool TrySubmitOrderedGuestImageFlip(
+        int videoOutHandle,
+        int displayBufferIndex,
+        ulong address,
+        uint width,
+        uint height,
+        uint pitchInPixel) =>
+        VulkanVideoPresenter.TrySubmitOrderedGuestImageFlip(
+            videoOutHandle,
+            displayBufferIndex,
+            address,
+            width,
+            height,
+            pitchInPixel);
+
     public void RegisterKnownDisplayBuffer(ulong address, uint guestFormat) =>
         VulkanVideoPresenter.RegisterKnownDisplayBuffer(address, guestFormat);
 
@@ -217,19 +313,23 @@ internal sealed class VulkanGuestGpuBackend : IGuestGpuBackend
         uint sourceWidth,
         uint sourceHeight,
         uint sourceFormat,
+        uint sourceNumberType,
         ulong destinationAddress,
         uint destinationWidth,
         uint destinationHeight,
-        uint destinationFormat) =>
+        uint destinationFormat,
+        uint destinationNumberType) =>
         VulkanVideoPresenter.TrySubmitGuestImageBlit(
             sourceAddress,
             sourceWidth,
             sourceHeight,
             sourceFormat,
+            sourceNumberType,
             destinationAddress,
             destinationWidth,
             destinationHeight,
-            destinationFormat);
+            destinationFormat,
+            destinationNumberType);
 
     public bool TryGetRenderTargetOutputKind(uint dataFormat, uint numberType, out Gen5PixelOutputKind outputKind)
     {

src/SharpEmu.Libs/HostTiming.cs

@@ -0,0 +1,82 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Diagnostics;
+
+namespace SharpEmu.Libs;
+
+/// <summary>
+/// High-resolution host sleeps for guest pacing. <see cref="Thread.Sleep(int)"/>
+/// routinely overshoots by a scheduler quantum, which turns per-frame waits
+/// (flip pacing, usleep-based game loops) into a hard frame-rate cap; these
+/// helpers sleep coarsely for the bulk of the interval and yield-spin the
+/// remainder so wakeups land within tens of microseconds of the target.
+/// </summary>
+internal static class HostTiming
+{
+    /// <summary>
+    /// Blocks until <see cref="Stopwatch.GetTimestamp"/> reaches
+    /// <paramref name="targetTimestamp"/>.
+    /// </summary>
+    public static void SleepUntil(long targetTimestamp)
+    {
+        while (true)
+        {
+            var remainingTicks = targetTimestamp - Stopwatch.GetTimestamp();
+            if (remainingTicks <= 0)
+            {
+                return;
+            }
+
+            if (remainingTicks > Stopwatch.Frequency * 60)
+            {
+                // Far-future target: coarse sleep avoids overflowing the
+                // microsecond conversion below and needs no precision.
+                Thread.Sleep(30_000);
+                continue;
+            }
+
+            var remainingMicroseconds = remainingTicks * 1_000_000 / Stopwatch.Frequency;
+            if (remainingMicroseconds > 2200)
+            {
+                // Coarse sleep for the bulk; macOS overshoots ~0.5-1.5 ms.
+                Thread.Sleep((int)((remainingMicroseconds - 1200) / 1000));
+            }
+            else if (remainingMicroseconds > 1200)
+            {
+                // A 1 ms nap typically wakes within the margin and costs no
+                // CPU, unlike yield-spinning through the whole tail.
+                Thread.Sleep(1);
+            }
+            else if (remainingMicroseconds > 100)
+            {
+                Thread.Sleep(0);
+            }
+            else
+            {
+                Thread.SpinWait(64);
+            }
+        }
+    }
+
+    /// <summary>Blocks for the given number of microseconds.</summary>
+    public static void SleepMicroseconds(long microseconds)
+    {
+        if (microseconds <= 0)
+        {
+            return;
+        }
+
+        if (microseconds >= 10_000_000)
+        {
+            // Long/sentinel sleeps (usleep(-1) parks): sub-millisecond
+            // precision is irrelevant and the tick conversion below would
+            // overflow, which used to turn the park into a hot spin.
+            Thread.Sleep((int)Math.Min(microseconds / 1000, int.MaxValue));
+            return;
+        }
+
+        var ticks = microseconds * Stopwatch.Frequency / 1_000_000;
+        SleepUntil(Stopwatch.GetTimestamp() + ticks);
+    }
+}

src/SharpEmu.Libs/Json/JsonExports.cs

@@ -2,12 +2,34 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 using System;
+using System.Buffers.Binary;
+using System.Collections.Concurrent;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
 using SharpEmu.HLE;
 
 namespace SharpEmu.Libs.Json;
 
 public static class JsonExports
 {
+    private const int ValueObjectSize = 0x20;
+    private const int StringObjectSize = 0x08;
+    private const ulong MaximumJsonBufferSize = 16 * 1024 * 1024;
+    private const int SceJsonParserErrorInvalidToken = unchecked((int)0x80920101);
+    private const int SceJsonParserErrorEmptyBuffer = unchecked((int)0x80920105);
+
+    private sealed record JsonValueState(JsonElement Element);
+
+    private sealed record JsonStringState(
+        string Value,
+        ulong GuestBufferAddress = 0,
+        int GuestBufferCapacity = 0);
+
+    private static readonly ConcurrentDictionary<ulong, JsonValueState> _values = new();
+    private static readonly ConcurrentDictionary<ulong, JsonStringState> _strings = new();
+    private static readonly JsonElement _nullElement = CreateNullElement();
+
     [SysAbiExport(
         Nid = "-hJRce8wn1U",
         ExportName = "_ZN3sce4Json12MemAllocatorC2Ev",
@@ -78,9 +100,6 @@ public static class JsonExports
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
 
-    // sce::Json::Initializer::setGlobalNullAccessCallback(const Value& (*)(ValueType, const Value*, void*), void*)
-    // Registers the guest hook invoked when a Value is accessed as the wrong type. Quake calls it
-    // during kexPSNWebAPI::Initialize and treats a non-zero return as a fatal init failure.
     [SysAbiExport(
         Nid = "+drDFyAS6u4",
         ExportName = "_ZN3sce4Json11Initializer27setGlobalNullAccessCallbackEPFRKNS0_5ValueENS0_9ValueTypeEPS3_PvES7_",
@@ -91,26 +110,38 @@ public static class JsonExports
         var thisAddress = ctx[CpuRegister.Rdi];
         if (thisAddress == 0)
         {
-            ctx[CpuRegister.Rax] = unchecked((ulong)(int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
-            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         JsonObjectHeap.GlobalNullAccessCallback = ctx[CpuRegister.Rsi];
         JsonObjectHeap.GlobalNullAccessCallbackContext = ctx[CpuRegister.Rdx];
         TraceJson("Initializer.setGlobalNullAccessCallback", thisAddress, ctx[CpuRegister.Rsi]);
-        ctx[CpuRegister.Rax] = 0;
-        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+        return SetReturn(ctx, 0);
     }
 
     [SysAbiExport(
         Nid = "WSOuge5IsCg",
         ExportName = "_ZN3sce4Json14InitParameter2C1Ev",
-        Target = Generation.Gen4 | Generation.Gen5,
-        LibraryName = "libSceJson2")]
+        Target = Generation.Gen5,
+        LibraryName = "libSceJson")]
     public static int InitParameter2Constructor(CpuContext ctx)
     {
         var thisAddress = ctx[CpuRegister.Rdi];
-        TraceJson("InitParameter2.ctor", thisAddress, ctx[CpuRegister.Rsi]);
+        if (thisAddress == 0)
+        {
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        // The PS5 ABI object occupies 0x28 bytes in the caller's frame. Its
+        // setters below replace the allocator and file-buffer fields.
+        Span<byte> parameter = stackalloc byte[0x28];
+        parameter.Clear();
+        if (!ctx.Memory.TryWrite(thisAddress, parameter))
+        {
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        }
+
+        TraceJson("InitParameter2.ctor", thisAddress, 0);
         ctx[CpuRegister.Rax] = thisAddress;
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
@@ -118,12 +149,24 @@ public static class JsonExports
     [SysAbiExport(
         Nid = "I2QC8PYhJWY",
         ExportName = "_ZN3sce4Json14InitParameter212setAllocatorEPNS0_12MemAllocatorEPv",
-        Target = Generation.Gen4 | Generation.Gen5,
-        LibraryName = "libSceJson2")]
+        Target = Generation.Gen5,
+        LibraryName = "libSceJson")]
     public static int InitParameter2SetAllocator(CpuContext ctx)
     {
         var thisAddress = ctx[CpuRegister.Rdi];
-        TraceJson("InitParameter2.setAllocator", thisAddress, ctx[CpuRegister.Rsi]);
+        if (thisAddress == 0)
+        {
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        Span<byte> fields = stackalloc byte[sizeof(ulong) * 2];
+        BinaryPrimitives.WriteUInt64LittleEndian(fields, ctx[CpuRegister.Rsi]);
+        BinaryPrimitives.WriteUInt64LittleEndian(fields[sizeof(ulong)..], ctx[CpuRegister.Rdx]);
+        if (!ctx.Memory.TryWrite(thisAddress, fields))
+        {
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        }
+
         ctx[CpuRegister.Rax] = thisAddress;
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
@@ -131,12 +174,16 @@ public static class JsonExports
     [SysAbiExport(
         Nid = "Eu95jmqn5Rw",
         ExportName = "_ZN3sce4Json14InitParameter217setFileBufferSizeEm",
-        Target = Generation.Gen4 | Generation.Gen5,
-        LibraryName = "libSceJson2")]
+        Target = Generation.Gen5,
+        LibraryName = "libSceJson")]
     public static int InitParameter2SetFileBufferSize(CpuContext ctx)
     {
         var thisAddress = ctx[CpuRegister.Rdi];
-        TraceJson("InitParameter2.setFileBufferSize", thisAddress, ctx[CpuRegister.Rsi]);
+        if (thisAddress == 0 || !ctx.TryWriteUInt64(thisAddress + 0x10, ctx[CpuRegister.Rsi]))
+        {
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
         ctx[CpuRegister.Rax] = thisAddress;
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
@@ -144,14 +191,474 @@ public static class JsonExports
     [SysAbiExport(
         Nid = "IXW-z8pggfg",
         ExportName = "_ZN3sce4Json11Initializer10initializeEPKNS0_14InitParameter2E",
-        Target = Generation.Gen4 | Generation.Gen5,
-        LibraryName = "libSceJson2")]
-    public static int Initializer2Constructor(CpuContext ctx)
+        Target = Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int InitializerInitialize2(CpuContext ctx)
     {
         var thisAddress = ctx[CpuRegister.Rdi];
-        TraceJson("Initializer2.ctor", thisAddress, ctx[CpuRegister.Rsi]);
+        var initParameterAddress = ctx[CpuRegister.Rsi];
+        if (thisAddress == 0 || initParameterAddress == 0)
+        {
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        TraceJson("Initializer.initialize2", thisAddress, initParameterAddress);
+        return SetReturn(ctx, 0);
+    }
+    public static int ValueConstructor(CpuContext ctx)
+    {
+        _ = ConstructValue(ctx);
+        return JsonValueExports.ValueDefaultConstructor(ctx);
+    }
+
+    [SysAbiExport(
+        Nid = "-wa17B7TGnw",
+        ExportName = "_ZN3sce4Json5ValueC2Ev",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueBaseConstructor(CpuContext ctx) => ConstructValue(ctx);
+    public static int ValueDestructor(CpuContext ctx)
+    {
+        _ = DestroyValue(ctx);
+        return JsonValueExports.ValueDestructor(ctx);
+    }
+
+    [SysAbiExport(
+        Nid = "0eUrW9JAxM0",
+        ExportName = "_ZN3sce4Json5ValueD2Ev",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueBaseDestructor(CpuContext ctx) => DestroyValue(ctx);
+
+    [SysAbiExport(
+        Nid = "S5JxQnoGF3E",
+        ExportName = "_ZN3sce4Json6Parser5parseERNS0_5ValueEPKcm",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ParserParseBuffer(CpuContext ctx)
+    {
+        var valueAddress = ctx[CpuRegister.Rdi];
+        var bufferAddress = ctx[CpuRegister.Rsi];
+        var bufferSize = ctx[CpuRegister.Rdx];
+        if (valueAddress == 0 || bufferAddress == 0 || bufferSize == 0)
+        {
+            return SetReturn(ctx, SceJsonParserErrorEmptyBuffer);
+        }
+
+        if (bufferSize > MaximumJsonBufferSize || bufferSize > int.MaxValue)
+        {
+            return SetReturn(ctx, SceJsonParserErrorInvalidToken);
+        }
+
+        var buffer = new byte[(int)bufferSize];
+        if (!ctx.Memory.TryRead(bufferAddress, buffer))
+        {
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        }
+
+        try
+        {
+            using var document = JsonDocument.Parse(buffer);
+            var element = document.RootElement.Clone();
+            StoreValue(ctx, valueAddress, element);
+            TraceJsonText("Parser.parse", valueAddress, Encoding.UTF8.GetString(buffer));
+            return SetReturn(ctx, 0);
+        }
+        catch (JsonException)
+        {
+            return SetReturn(ctx, SceJsonParserErrorInvalidToken);
+        }
+    }
+
+    [SysAbiExport(
+        Nid = "SHtAad20YYM",
+        ExportName = "_ZNK3sce4Json5Value7getTypeEv",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueGetType(CpuContext ctx)
+    {
+        var valueAddress = ctx[CpuRegister.Rdi];
+        var element = GetValue(valueAddress);
+        ctx[CpuRegister.Rax] = (ulong)GetValueType(element);
+        return 0;
+    }
+
+    [SysAbiExport(
+        Nid = "RBw+4NukeGQ",
+        ExportName = "_ZNK3sce4Json5Value5countEv",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueCount(CpuContext ctx)
+    {
+        var element = GetValue(ctx[CpuRegister.Rdi]);
+        ctx[CpuRegister.Rax] = element.ValueKind switch
+        {
+            System.Text.Json.JsonValueKind.Array => (ulong)element.GetArrayLength(),
+            System.Text.Json.JsonValueKind.Object => (ulong)element.EnumerateObject().Count(),
+            _ => 0,
+        };
+        return 0;
+    }
+
+    [SysAbiExport(
+        Nid = "zTwZdI8AZ5Y",
+        ExportName = "_ZNK3sce4Json5Value10getBooleanEv",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueGetBoolean(CpuContext ctx) => ReturnValueStorage(ctx);
+
+    [SysAbiExport(
+        Nid = "DIxvoy7Ngvk",
+        ExportName = "_ZNK3sce4Json5Value10getIntegerEv",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueGetInteger(CpuContext ctx) => ReturnValueStorage(ctx);
+
+    [SysAbiExport(
+        Nid = "sn4HNCtNRzY",
+        ExportName = "_ZNK3sce4Json5Value11getUIntegerEv",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueGetUnsignedInteger(CpuContext ctx) => ReturnValueStorage(ctx);
+
+    [SysAbiExport(
+        Nid = "3qrge7L-AU4",
+        ExportName = "_ZNK3sce4Json5Value7getRealEv",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueGetReal(CpuContext ctx) => ReturnValueStorage(ctx);
+
+    [SysAbiExport(
+        Nid = "HwDt5lD9Bfo",
+        ExportName = "_ZNK3sce4Json5ValueixEPKc",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueIndexCString(CpuContext ctx)
+    {
+        var valueAddress = ctx[CpuRegister.Rdi];
+        var keyAddress = ctx[CpuRegister.Rsi];
+        if (!TryReadUtf8CString(ctx, keyAddress, 4096, out var key) ||
+            !TryAllocateGuestObject(ctx, ValueObjectSize, out var childAddress))
+        {
+            ctx[CpuRegister.Rax] = 0;
+            return 0;
+        }
+
+        var parent = GetValue(valueAddress);
+        var child = parent.ValueKind == System.Text.Json.JsonValueKind.Object &&
+            parent.TryGetProperty(key, out var property)
+            ? property.Clone()
+            : _nullElement;
+        StoreValue(ctx, childAddress, child);
+        ctx[CpuRegister.Rax] = childAddress;
+        TraceJsonText("Value.index", valueAddress, key);
+        return 0;
+    }
+
+    [SysAbiExport(
+        Nid = "XlWbvieLj2M",
+        ExportName = "_ZNK3sce4Json5ValueixEm",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueIndexPosition(CpuContext ctx) => ReturnIndexedValue(ctx);
+
+    [SysAbiExport(
+        Nid = "0YqYAoO-+Uo",
+        ExportName = "_ZNK3sce4Json5Value8getValueEm",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueGetPosition(CpuContext ctx) => ReturnIndexedValue(ctx);
+
+    [SysAbiExport(
+        Nid = "4zrm6VrgIAw",
+        ExportName = "_ZN3sce4Json5ValueaSERKS1_",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueAssignment(CpuContext ctx)
+    {
+        var destinationAddress = ctx[CpuRegister.Rdi];
+        var sourceAddress = ctx[CpuRegister.Rsi];
+        if (destinationAddress != 0)
+        {
+            StoreValue(ctx, destinationAddress, GetValue(sourceAddress));
+        }
+
+        ctx[CpuRegister.Rax] = destinationAddress;
+        return 0;
+    }
+    public static int StringConstructor(CpuContext ctx)
+    {
+        _ = ConstructString(ctx);
+        return JsonValueExports.StringDefaultConstructor(ctx);
+    }
+
+    [SysAbiExport(
+        Nid = "eG9E9M6XvTM",
+        ExportName = "_ZN3sce4Json6StringC2Ev",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int StringBaseConstructor(CpuContext ctx) => ConstructString(ctx);
+    public static int StringDestructor(CpuContext ctx)
+    {
+        _ = DestroyString(ctx);
+        return JsonValueExports.StringDestructor(ctx);
+    }
+
+    [SysAbiExport(
+        Nid = "Ui7YFnSTCBw",
+        ExportName = "_ZN3sce4Json6StringD2Ev",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int StringBaseDestructor(CpuContext ctx) => DestroyString(ctx);
+
+    [SysAbiExport(
+        Nid = "Ncel8t2Rrpc",
+        ExportName = "_ZNK3sce4Json5Value8toStringERNS0_6StringE",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int ValueToString(CpuContext ctx)
+    {
+        var valueAddress = ctx[CpuRegister.Rdi];
+        var stringAddress = ctx[CpuRegister.Rsi];
+        if (stringAddress != 0)
+        {
+            var element = GetValue(valueAddress);
+            var value = element.ValueKind == System.Text.Json.JsonValueKind.String
+                ? element.GetString() ?? string.Empty
+                : element.GetRawText();
+            _strings[stringAddress] = new JsonStringState(value);
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return 0;
+    }
+
+    [SysAbiExport(
+        Nid = "L1KAkYWml-M",
+        ExportName = "_ZNK3sce4Json6String5c_strEv",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libSceJson")]
+    public static int StringCStr(CpuContext ctx)
+    {
+        var stringAddress = ctx[CpuRegister.Rdi];
+        if (!_strings.TryGetValue(stringAddress, out var state))
+        {
+            state = new JsonStringState(string.Empty);
+        }
+
+        var bytes = Encoding.UTF8.GetBytes(state.Value + '\0');
+        var guestBufferAddress = state.GuestBufferAddress;
+        if (guestBufferAddress == 0 || state.GuestBufferCapacity < bytes.Length)
+        {
+            if (!TryAllocateGuestObject(ctx, bytes.Length, out guestBufferAddress))
+            {
+                ctx[CpuRegister.Rax] = 0;
+                return 0;
+            }
+        }
+
+        if (!ctx.Memory.TryWrite(guestBufferAddress, bytes))
+        {
+            ctx[CpuRegister.Rax] = 0;
+            return 0;
+        }
+
+        _strings[stringAddress] = state with
+        {
+            GuestBufferAddress = guestBufferAddress,
+            GuestBufferCapacity = bytes.Length,
+        };
+        ctx.TryWriteUInt64(stringAddress, guestBufferAddress);
+        ctx[CpuRegister.Rax] = guestBufferAddress;
+        TraceJsonText("String.c_str", stringAddress, state.Value);
+        return 0;
+    }
+
+    private static int ConstructValue(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        if (thisAddress == 0)
+        {
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        StoreValue(ctx, thisAddress, _nullElement);
         ctx[CpuRegister.Rax] = thisAddress;
-        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+        return 0;
+    }
+
+    private static int ReturnIndexedValue(CpuContext ctx)
+    {
+        var valueAddress = ctx[CpuRegister.Rdi];
+        var position = ctx[CpuRegister.Rsi];
+        if (!TryAllocateGuestObject(ctx, ValueObjectSize, out var childAddress))
+        {
+            ctx[CpuRegister.Rax] = 0;
+            return 0;
+        }
+
+        var parent = GetValue(valueAddress);
+        var child = parent.ValueKind == System.Text.Json.JsonValueKind.Array &&
+            position < (ulong)parent.GetArrayLength()
+            ? parent[(int)position].Clone()
+            : _nullElement;
+        StoreValue(ctx, childAddress, child);
+        ctx[CpuRegister.Rax] = childAddress;
+        return 0;
+    }
+
+    private static int ReturnValueStorage(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        ctx[CpuRegister.Rax] = thisAddress == 0 ? 0 : thisAddress + 0x10;
+        return 0;
+    }
+
+    private static int DestroyValue(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        _values.TryRemove(thisAddress, out _);
+        if (thisAddress != 0)
+        {
+            Span<byte> empty = stackalloc byte[ValueObjectSize];
+            empty.Clear();
+            ctx.Memory.TryWrite(thisAddress, empty);
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return 0;
+    }
+
+    private static int ConstructString(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        if (thisAddress == 0)
+        {
+            return SetReturn(ctx, (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        _strings[thisAddress] = new JsonStringState(string.Empty);
+        ctx.TryWriteUInt64(thisAddress, 0);
+        ctx[CpuRegister.Rax] = thisAddress;
+        return 0;
+    }
+
+    private static int DestroyString(CpuContext ctx)
+    {
+        var thisAddress = ctx[CpuRegister.Rdi];
+        _strings.TryRemove(thisAddress, out _);
+        if (thisAddress != 0)
+        {
+            ctx.TryWriteUInt64(thisAddress, 0);
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return 0;
+    }
+
+    private static JsonElement CreateNullElement()
+    {
+        using var document = JsonDocument.Parse("null");
+        return document.RootElement.Clone();
+    }
+
+    private static JsonElement GetValue(ulong address) =>
+        address != 0 && _values.TryGetValue(address, out var state)
+            ? state.Element
+            : _nullElement;
+
+    private static void StoreValue(CpuContext ctx, ulong address, JsonElement element)
+    {
+        if (address == 0)
+        {
+            return;
+        }
+
+        var clone = element.Clone();
+        _values[address] = new JsonValueState(clone);
+
+        Span<byte> mirror = stackalloc byte[ValueObjectSize];
+        mirror.Clear();
+        var type = GetValueType(clone);
+        BinaryPrimitives.WriteInt32LittleEndian(mirror[0x1C..], type);
+        switch (clone.ValueKind)
+        {
+            case System.Text.Json.JsonValueKind.True:
+                mirror[0x10] = 1;
+                break;
+            case System.Text.Json.JsonValueKind.Number when clone.TryGetInt64(out var integer):
+                BinaryPrimitives.WriteInt64LittleEndian(mirror[0x10..], integer);
+                break;
+            case System.Text.Json.JsonValueKind.Number when clone.TryGetUInt64(out var unsignedInteger):
+                BinaryPrimitives.WriteUInt64LittleEndian(mirror[0x10..], unsignedInteger);
+                break;
+            case System.Text.Json.JsonValueKind.Number:
+                BinaryPrimitives.WriteInt64LittleEndian(
+                    mirror[0x10..],
+                    BitConverter.DoubleToInt64Bits(clone.GetDouble()));
+                break;
+        }
+
+        ctx.Memory.TryWrite(address, mirror);
+    }
+
+    private static int GetValueType(JsonElement element) => element.ValueKind switch
+    {
+        System.Text.Json.JsonValueKind.True or System.Text.Json.JsonValueKind.False => 1,
+        System.Text.Json.JsonValueKind.Number when element.TryGetInt64(out _) => 2,
+        System.Text.Json.JsonValueKind.Number when element.TryGetUInt64(out _) => 3,
+        System.Text.Json.JsonValueKind.Number => 4,
+        System.Text.Json.JsonValueKind.String => 5,
+        System.Text.Json.JsonValueKind.Array => 6,
+        System.Text.Json.JsonValueKind.Object => 7,
+        _ => 0,
+    };
+
+    private static bool TryAllocateGuestObject(CpuContext ctx, int size, out ulong address)
+    {
+        address = 0;
+        return size > 0 &&
+            ctx.Memory is IGuestMemoryAllocator allocator &&
+            allocator.TryAllocateGuestMemory((ulong)size, 0x10, out address);
+    }
+
+    private static bool TryReadUtf8CString(
+        CpuContext ctx,
+        ulong address,
+        int maximumLength,
+        out string value)
+    {
+        value = string.Empty;
+        if (address == 0 || maximumLength <= 0)
+        {
+            return false;
+        }
+
+        var bytes = new byte[maximumLength];
+        Span<byte> current = stackalloc byte[1];
+        for (var index = 0; index < bytes.Length; index++)
+        {
+            if (!ctx.Memory.TryRead(address + (ulong)index, current))
+            {
+                return false;
+            }
+
+            if (current[0] == 0)
+            {
+                value = Encoding.UTF8.GetString(bytes, 0, index);
+                return true;
+            }
+
+            bytes[index] = current[0];
+        }
+
+        return false;
+    }
+
+    private static int SetReturn(CpuContext ctx, int result)
+    {
+        ctx[CpuRegister.Rax] = unchecked((ulong)result);
+        return result;
     }
 
     private static void TraceJson(string operation, ulong thisAddress, ulong argument)
@@ -164,4 +671,16 @@ public static class JsonExports
         Console.Error.WriteLine(
             $"[LOADER][TRACE] json.{operation} this=0x{thisAddress:X16} arg=0x{argument:X16}");
     }
+
+    private static void TraceJsonText(string operation, ulong thisAddress, string value)
+    {
+        if (!string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_JSON"), "1", StringComparison.Ordinal))
+        {
+            return;
+        }
+
+        var preview = value.Length <= 128 ? value : value[..128];
+        Console.Error.WriteLine(
+            $"[LOADER][TRACE] json.{operation} this=0x{thisAddress:X16} value={preview}");
+    }
 }

src/SharpEmu.Libs/Kernel/KernelEventFlagCompatExports.cs

@@ -1,8 +1,8 @@
 // Copyright (C) 2026 SharpEmu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+using System.Buffers.Binary;
 using System.Collections.Concurrent;
-using System.Diagnostics;
 using System.Text;
 using SharpEmu.HLE;
 using SharpEmu.Libs.Fiber;
@@ -25,6 +25,11 @@ public static class KernelEventFlagCompatExports
     private static readonly ConcurrentDictionary<ulong, EventFlagState> _eventFlags = new();
     private static long _nextEventFlagHandle = 1;
 
+    // Cached once: gating every call site avoids building the interpolated
+    // trace string (and FormatFrameChain/FormatGuestWaitObject) when disabled.
+    private static readonly bool _traceEventFlag = string.Equals(
+        Environment.GetEnvironmentVariable("SHARPEMU_LOG_EVENT_FLAG"), "1", StringComparison.Ordinal);
+
     private sealed class EventFlagState
     {
         public required string Name { get; init; }
@@ -34,45 +39,6 @@ public static class KernelEventFlagCompatExports
         public object Gate { get; } = new();
     }
 
-    private sealed class EventFlagWaiter : IGuestThreadBlockWaiter
-    {
-        public required CpuContext Ctx { get; init; }
-        public required EventFlagState State { get; init; }
-        public required ulong Pattern { get; init; }
-        public required uint WaitMode { get; init; }
-        public required ulong ResultAddress { get; init; }
-        public bool Timed { get; init; }
-
-        // Timed-wait completion state; unused when Timed is false.
-        public ulong TimeoutAddress { get; init; }
-        public long DeadlineTimestamp { get; init; }
-
-        public OrbisGen2Result? Result { get; set; }
-
-        // Untimed waits stash the prepared result here at wake and return it at resume.
-        private OrbisGen2Result _blockedResult = OrbisGen2Result.ORBIS_GEN2_OK;
-
-        public int Resume() => Timed
-            ? CompleteBlockedTimedWait(Ctx, State, this, Pattern, WaitMode, ResultAddress, TimeoutAddress, DeadlineTimestamp)
-            : (int)_blockedResult;
-
-        public bool TryWake()
-        {
-            if (Timed)
-            {
-                return TryCompleteBlockedTimedWait(Ctx, State, this, Pattern, WaitMode, ResultAddress);
-            }
-
-            if (!TryPrepareBlockedWait(Ctx, State, Pattern, WaitMode, ResultAddress, out var preparedResult))
-            {
-                return false;
-            }
-
-            _blockedResult = preparedResult;
-            return true;
-        }
-    }
-
     [SysAbiExport(
         Nid = "BpFoboUJoZU",
         ExportName = "sceKernelCreateEventFlag",
@@ -91,17 +57,17 @@ public static class KernelEventFlagCompatExports
             optionAddress != 0 ||
             !IsValidAttributes(attributes))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
-        if (!ctx.TryReadNullTerminatedUtf8(nameAddress, MaxEventFlagNameLength + 1, out var name))
+        if (!TryReadNullTerminatedUtf8(ctx, nameAddress, MaxEventFlagNameLength + 1, out var name))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
         }
 
         if (Encoding.UTF8.GetByteCount(name) > MaxEventFlagNameLength)
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         var handle = unchecked((ulong)Interlocked.Increment(ref _nextEventFlagHandle));
@@ -115,11 +81,11 @@ public static class KernelEventFlagCompatExports
         if (!ctx.TryWriteUInt64(outAddress, handle))
         {
             _eventFlags.TryRemove(handle, out _);
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
         }
 
-        TraceEventFlag($"create handle=0x{handle:X16} name='{name}' attr=0x{attributes:X2} bits=0x{initialPattern:X16}");
-        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+        if (_traceEventFlag) TraceEventFlag($"create handle=0x{handle:X16} name='{name}' attr=0x{attributes:X2} bits=0x{initialPattern:X16}");
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
     }
 
     [SysAbiExport(
@@ -132,7 +98,7 @@ public static class KernelEventFlagCompatExports
         var handle = ctx[CpuRegister.Rdi];
         if (!_eventFlags.TryRemove(handle, out var state))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
         }
 
         lock (state.Gate)
@@ -140,8 +106,8 @@ public static class KernelEventFlagCompatExports
             Monitor.PulseAll(state.Gate);
         }
 
-        TraceEventFlag($"delete handle=0x{handle:X16} name='{state.Name}'");
-        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+        if (_traceEventFlag) TraceEventFlag($"delete handle=0x{handle:X16} name='{state.Name}'");
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
     }
 
     [SysAbiExport(
@@ -156,18 +122,18 @@ public static class KernelEventFlagCompatExports
         var returnRip = GetCurrentReturnRip();
         if (!_eventFlags.TryGetValue(handle, out var state))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
         }
 
         lock (state.Gate)
         {
             state.Bits |= pattern;
             Monitor.PulseAll(state.Gate);
-            TraceEventFlag($"set handle=0x{handle:X16} pattern=0x{pattern:X16} bits=0x{state.Bits:X16} ret=0x{returnRip:X16}");
+            if (_traceEventFlag) TraceEventFlag($"set handle=0x{handle:X16} pattern=0x{pattern:X16} bits=0x{state.Bits:X16} ret=0x{returnRip:X16}");
         }
 
         _ = GuestThreadExecution.Scheduler?.WakeBlockedThreads(GetEventFlagWakeKey(handle));
-        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
     }
 
     [SysAbiExport(
@@ -181,16 +147,16 @@ public static class KernelEventFlagCompatExports
         var pattern = ctx[CpuRegister.Rsi];
         if (!_eventFlags.TryGetValue(handle, out var state))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
         }
 
         lock (state.Gate)
         {
             state.Bits &= pattern;
-            TraceEventFlag($"clear handle=0x{handle:X16} mask=0x{pattern:X16} bits=0x{state.Bits:X16}");
+            if (_traceEventFlag) TraceEventFlag($"clear handle=0x{handle:X16} mask=0x{pattern:X16} bits=0x{state.Bits:X16}");
         }
 
-        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
     }
 
     [SysAbiExport(
@@ -207,29 +173,29 @@ public static class KernelEventFlagCompatExports
 
         if (!_eventFlags.TryGetValue(handle, out var state))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
         }
 
         if (pattern == 0 || !IsValidWaitMode(waitMode))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         lock (state.Gate)
         {
             if (!TryWriteResultPattern(ctx, resultAddress, state.Bits))
             {
-                return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+                return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
             }
 
             if (!IsSatisfied(state.Bits, pattern, waitMode))
             {
-                return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_BUSY);
+                return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_BUSY);
             }
 
             ApplyClearMode(state, pattern, waitMode);
-            TraceEventFlag($"poll handle=0x{handle:X16} pattern=0x{pattern:X16} mode=0x{waitMode:X2} bits=0x{state.Bits:X16}");
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+            if (_traceEventFlag) TraceEventFlag($"poll handle=0x{handle:X16} pattern=0x{pattern:X16} mode=0x{waitMode:X2} bits=0x{state.Bits:X16}");
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
         }
     }
 
@@ -249,18 +215,18 @@ public static class KernelEventFlagCompatExports
 
         if (!_eventFlags.TryGetValue(handle, out var state))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
         }
 
         if (pattern == 0 || !IsValidWaitMode(waitMode))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         uint timeoutUsec = 0;
-        if (timeoutAddress != 0 && !ctx.TryReadUInt32(timeoutAddress, out timeoutUsec))
+        if (timeoutAddress != 0 && !TryReadUInt32(ctx, timeoutAddress, out timeoutUsec))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
         }
 
         Monitor.Enter(state.Gate);
@@ -268,77 +234,76 @@ public static class KernelEventFlagCompatExports
         {
             if (TryCompleteSatisfiedWait(ctx, state, pattern, waitMode, resultAddress, out var immediateWaitResult))
             {
-                return ctx.SetReturn(immediateWaitResult);
+                return SetReturn(ctx, immediateWaitResult);
             }
 
-            if (timeoutAddress != 0)
-            {
-                if (timeoutUsec == 0)
-                {
-                    _ = ctx.TryWriteUInt32(timeoutAddress, 0);
-                    _ = TryWriteResultPattern(ctx, resultAddress, state.Bits);
-                    TraceEventFlag($"wait-timeout handle=0x{handle:X16} pattern=0x{pattern:X16} timeout=0 ret=0x{returnRip:X16}");
-                    return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_TIMED_OUT);
-                }
-
-                var deadline = GuestThreadExecution.ComputeDeadlineTimestamp(
-                    TimeSpan.FromTicks((long)timeoutUsec * 10L));
-                var timedWaiter = new EventFlagWaiter
-                {
-                    Ctx = ctx,
-                    State = state,
-                    Pattern = pattern,
-                    WaitMode = waitMode,
-                    ResultAddress = resultAddress,
-                    Timed = true,
-                    TimeoutAddress = timeoutAddress,
-                    DeadlineTimestamp = deadline,
-                };
-                if (GuestThreadExecution.RequestCurrentThreadBlock(
-                        ctx,
-                        "sceKernelWaitEventFlag",
-                        GetEventFlagWakeKey(handle),
-                        timedWaiter,
-                        blockDeadlineTimestamp: deadline))
-                {
-                    state.WaitingThreads++;
-                    TraceEventFlag($"wait-block-timed handle=0x{handle:X16} pattern=0x{pattern:X16} timeout={timeoutUsec} waiters={state.WaitingThreads} ret=0x{returnRip:X16}");
-                    return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
-                }
-
-                _ = ctx.TryWriteUInt32(timeoutAddress, 0);
-                _ = TryWriteResultPattern(ctx, resultAddress, state.Bits);
-                TraceEventFlag($"wait-timeout-host handle=0x{handle:X16} pattern=0x{pattern:X16} timeout={timeoutUsec} ret=0x{returnRip:X16}");
-                return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_TIMED_OUT);
-            }
+            // Timed waits block on a deadline instead of returning TIMED_OUT
+            // immediately; a zero-microsecond timeout still degrades to an
+            // instant poll because the deadline is already in the past.
+            var deadline = timeoutAddress != 0
+                ? GuestThreadExecution.ComputeDeadlineTimestamp(TimeSpan.FromMicroseconds(timeoutUsec))
+                : 0;
+            var hostDeadlineMs = timeoutAddress != 0
+                ? Environment.TickCount64 + (timeoutUsec == 0
+                    ? 0L
+                    : Math.Max(1L, (timeoutUsec + 999L) / 1000L))
+                : long.MaxValue;
 
             var currentGuestThread = GuestThreadExecution.CurrentGuestThreadHandle;
             var currentFiber = FiberExports.GetCurrentFiberAddressForDiagnostics(ctx);
             var managedThread = Environment.CurrentManagedThreadId;
+            var blockedWaitResult = OrbisGen2Result.ORBIS_GEN2_OK;
+            var satisfied = false;
             var requestedBlock = GuestThreadExecution.RequestCurrentThreadBlock(
                 ctx,
                 "sceKernelWaitEventFlag",
                 GetEventFlagWakeKey(handle),
-                new EventFlagWaiter
+                () =>
                 {
-                    Ctx = ctx,
-                    State = state,
-                    Pattern = pattern,
-                    WaitMode = waitMode,
-                    ResultAddress = resultAddress,
-                });
-            TraceEventFlag($"wait-unsatisfied handle=0x{handle:X16} pattern=0x{pattern:X16} bits=0x{state.Bits:X16} guest_thread=0x{currentGuestThread:X16} fiber=0x{currentFiber:X16} managed={managedThread} block={requestedBlock} ret=0x{returnRip:X16} frames={FormatFrameChain(ctx)}");
-            TraceEventFlag($"wait-object handle=0x{handle:X16} name='{state.Name}' {FormatGuestWaitObject(ctx)}");
+                    if (satisfied)
+                    {
+                        return (int)blockedWaitResult;
+                    }
+
+                    // Deadline expiry: report timeout with the current bits.
+                    if (timeoutAddress != 0)
+                    {
+                        _ = TryWriteUInt32(ctx, timeoutAddress, 0);
+                    }
+
+                    _ = TryWriteResultPattern(ctx, resultAddress, state.Bits);
+                    return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_TIMED_OUT;
+                },
+                () =>
+                {
+                    if (!TryPrepareBlockedWait(
+                            ctx,
+                            state,
+                            pattern,
+                            waitMode,
+                            resultAddress,
+                            out var preparedResult))
+                    {
+                        return false;
+                    }
+
+                    blockedWaitResult = preparedResult;
+                    satisfied = true;
+                    return true;
+                },
+                deadline);
+            if (_traceEventFlag) TraceEventFlag($"wait-unsatisfied handle=0x{handle:X16} pattern=0x{pattern:X16} bits=0x{state.Bits:X16} guest_thread=0x{currentGuestThread:X16} fiber=0x{currentFiber:X16} managed={managedThread} block={requestedBlock} ret=0x{returnRip:X16} frames={FormatFrameChain(ctx)}");
+            if (_traceEventFlag) TraceEventFlag($"wait-object handle=0x{handle:X16} name='{state.Name}' {FormatGuestWaitObject(ctx)}");
             if (!requestedBlock)
             {
                 var scheduler = GuestThreadExecution.Scheduler;
                 if (scheduler is null)
                 {
-                    return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_TRY_AGAIN);
+                    return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_TRY_AGAIN);
                 }
 
                 state.WaitingThreads++;
-                TraceEventFlag($"wait-pump handle=0x{handle:X16} pattern=0x{pattern:X16} waiters={state.WaitingThreads} guest_thread=0x{currentGuestThread:X16} fiber=0x{currentFiber:X16} managed={managedThread} ret=0x{returnRip:X16}");
+                if (_traceEventFlag) TraceEventFlag($"wait-pump handle=0x{handle:X16} pattern=0x{pattern:X16} waiters={state.WaitingThreads} guest_thread=0x{currentGuestThread:X16} fiber=0x{currentFiber:X16} managed={managedThread} ret=0x{returnRip:X16}");
                 var releaseWaiter = true;
                 try
                 {
@@ -358,11 +323,22 @@ public static class KernelEventFlagCompatExports
                         {
                             state.WaitingThreads = Math.Max(0, state.WaitingThreads - 1);
                             releaseWaiter = false;
-                            TraceEventFlag($"wait-wake handle=0x{handle:X16} pattern=0x{pattern:X16} bits=0x{state.Bits:X16} waiters={state.WaitingThreads} ret=0x{returnRip:X16}");
-                            return ctx.SetReturn(pumpedWaitResult);
+                            if (_traceEventFlag) TraceEventFlag($"wait-wake handle=0x{handle:X16} pattern=0x{pattern:X16} bits=0x{state.Bits:X16} waiters={state.WaitingThreads} ret=0x{returnRip:X16}");
+                            return SetReturn(ctx, pumpedWaitResult);
                         }
 
-                        Monitor.Wait(state.Gate, HostWaitPumpMilliseconds);
+                        var remaining = hostDeadlineMs - Environment.TickCount64;
+                        if (timeoutAddress != 0 && remaining <= 0)
+                        {
+                            state.WaitingThreads = Math.Max(0, state.WaitingThreads - 1);
+                            releaseWaiter = false;
+                            _ = TryWriteUInt32(ctx, timeoutAddress, 0);
+                            _ = TryWriteResultPattern(ctx, resultAddress, state.Bits);
+                            if (_traceEventFlag) TraceEventFlag($"wait-timeout handle=0x{handle:X16} pattern=0x{pattern:X16} bits=0x{state.Bits:X16} ret=0x{returnRip:X16}");
+                            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_TIMED_OUT);
+                        }
+
+                        Monitor.Wait(state.Gate, (int)Math.Min(remaining, HostWaitPumpMilliseconds));
                     }
                 }
                 finally
@@ -375,8 +351,8 @@ public static class KernelEventFlagCompatExports
             }
 
             state.WaitingThreads++;
-            TraceEventFlag($"wait-block handle=0x{handle:X16} pattern=0x{pattern:X16} waiters={state.WaitingThreads} guest_thread=0x{currentGuestThread:X16} fiber=0x{currentFiber:X16} managed={managedThread} ret=0x{returnRip:X16}");
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+            if (_traceEventFlag) TraceEventFlag($"wait-block handle=0x{handle:X16} pattern=0x{pattern:X16} waiters={state.WaitingThreads} guest_thread=0x{currentGuestThread:X16} fiber=0x{currentFiber:X16} managed={managedThread} ret=0x{returnRip:X16}");
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
         }
         finally
         {
@@ -396,24 +372,26 @@ public static class KernelEventFlagCompatExports
         var waiterCountAddress = ctx[CpuRegister.Rdx];
         if (!_eventFlags.TryGetValue(handle, out var state))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
         }
 
         lock (state.Gate)
         {
             if (waiterCountAddress != 0 &&
-                !ctx.TryWriteUInt32(waiterCountAddress, unchecked((uint)state.WaitingThreads)))
+                !TryWriteUInt32(ctx, waiterCountAddress, unchecked((uint)state.WaitingThreads)))
             {
-                return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+                return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
             }
 
             state.Bits = setPattern;
             state.WaitingThreads = 0;
             Monitor.PulseAll(state.Gate);
-            TraceEventFlag($"cancel handle=0x{handle:X16} bits=0x{setPattern:X16}");
+            if (_traceEventFlag) TraceEventFlag(
+                $"cancel handle=0x{handle:X16} bits=0x{setPattern:X16} " +
+                $"guest_thread=0x{GuestThreadExecution.CurrentGuestThreadHandle:X16} ret=0x{GetCurrentReturnRip():X16}");
         }
 
-        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
     }
 
     private static bool IsValidAttributes(uint attributes)
@@ -503,107 +481,99 @@ public static class KernelEventFlagCompatExports
             }
 
             state.WaitingThreads = Math.Max(0, state.WaitingThreads - 1);
-            TraceEventFlag(
+            if (_traceEventFlag) TraceEventFlag(
                 $"wait-wake pattern=0x{pattern:X16} mode=0x{waitMode:X2} bits=0x{state.Bits:X16} waiters={state.WaitingThreads}");
             return true;
         }
     }
 
-    private static bool TryCompleteBlockedTimedWait(
-        CpuContext ctx,
-        EventFlagState state,
-        EventFlagWaiter waiter,
-        ulong pattern,
-        uint waitMode,
-        ulong resultAddress)
-    {
-        lock (state.Gate)
-        {
-            if (waiter.Result is not null)
-            {
-                return true;
-            }
-
-            if (!IsSatisfied(state.Bits, pattern, waitMode))
-            {
-                return false;
-            }
-
-            waiter.Result = TryWriteResultPattern(ctx, resultAddress, state.Bits)
-                ? OrbisGen2Result.ORBIS_GEN2_OK
-                : OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
-            if (waiter.Result == OrbisGen2Result.ORBIS_GEN2_OK)
-            {
-                ApplyClearMode(state, pattern, waitMode);
-            }
-
-            state.WaitingThreads = Math.Max(0, state.WaitingThreads - 1);
-            return true;
-        }
-    }
-
-    private static int CompleteBlockedTimedWait(
-        CpuContext ctx,
-        EventFlagState state,
-        EventFlagWaiter waiter,
-        ulong pattern,
-        uint waitMode,
-        ulong resultAddress,
-        ulong timeoutAddress,
-        long deadlineTimestamp)
-    {
-        lock (state.Gate)
-        {
-            if (waiter.Result is null)
-            {
-                if (IsSatisfied(state.Bits, pattern, waitMode))
-                {
-                    waiter.Result = TryWriteResultPattern(ctx, resultAddress, state.Bits)
-                        ? OrbisGen2Result.ORBIS_GEN2_OK
-                        : OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
-                    if (waiter.Result == OrbisGen2Result.ORBIS_GEN2_OK)
-                    {
-                        ApplyClearMode(state, pattern, waitMode);
-                    }
-                }
-                else
-                {
-                    waiter.Result = TryWriteResultPattern(ctx, resultAddress, state.Bits)
-                        ? OrbisGen2Result.ORBIS_GEN2_ERROR_TIMED_OUT
-                        : OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
-                }
-
-                state.WaitingThreads = Math.Max(0, state.WaitingThreads - 1);
-            }
-        }
-
-        if (waiter.Result == OrbisGen2Result.ORBIS_GEN2_OK)
-        {
-            var remainingTicks = deadlineTimestamp - Stopwatch.GetTimestamp();
-            var remainingMicros = remainingTicks <= 0
-                ? 0u
-                : (uint)Math.Min(
-                    uint.MaxValue,
-                    remainingTicks / (double)Stopwatch.Frequency * 1_000_000d);
-            _ = ctx.TryWriteUInt32(timeoutAddress, remainingMicros);
-        }
-        else
-        {
-            _ = ctx.TryWriteUInt32(timeoutAddress, 0);
-        }
-
-        return (int)waiter.Result.Value;
-    }
-
     private static string GetEventFlagWakeKey(ulong handle) =>
         $"event_flag:0x{handle:X16}";
 
     private static bool TryWriteResultPattern(CpuContext ctx, ulong address, ulong bits) =>
         address == 0 || ctx.TryWriteUInt64(address, bits);
 
+    private static bool TryReadUInt32(CpuContext ctx, ulong address, out uint value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(uint)];
+        if (!ctx.Memory.TryRead(address, buffer))
+        {
+            value = 0;
+            return false;
+        }
+
+        value = BinaryPrimitives.ReadUInt32LittleEndian(buffer);
+        return true;
+    }
+
+    private static bool TryReadUInt64(CpuContext ctx, ulong address, out ulong value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(ulong)];
+        if (!ctx.Memory.TryRead(address, buffer))
+        {
+            value = 0;
+            return false;
+        }
+
+        value = BinaryPrimitives.ReadUInt64LittleEndian(buffer);
+        return true;
+    }
+
+    private static bool TryReadByte(CpuContext ctx, ulong address, out byte value)
+    {
+        Span<byte> buffer = stackalloc byte[1];
+        if (!ctx.Memory.TryRead(address, buffer))
+        {
+            value = 0;
+            return false;
+        }
+
+        value = buffer[0];
+        return true;
+    }
+
+    private static bool TryWriteUInt32(CpuContext ctx, ulong address, uint value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(uint)];
+        BinaryPrimitives.WriteUInt32LittleEndian(buffer, value);
+        return ctx.Memory.TryWrite(address, buffer);
+    }
+
+    private static bool TryReadNullTerminatedUtf8(CpuContext ctx, ulong address, int capacity, out string value)
+    {
+        var bytes = new byte[capacity];
+        Span<byte> current = stackalloc byte[1];
+        for (var index = 0; index < bytes.Length; index++)
+        {
+            if (!ctx.Memory.TryRead(address + (ulong)index, current))
+            {
+                value = string.Empty;
+                return false;
+            }
+
+            if (current[0] == 0)
+            {
+                value = Encoding.UTF8.GetString(bytes, 0, index);
+                return true;
+            }
+
+            bytes[index] = current[0];
+        }
+
+        value = Encoding.UTF8.GetString(bytes);
+        return true;
+    }
+
+    private static int SetReturn(CpuContext ctx, OrbisGen2Result result)
+    {
+        var value = (int)result;
+        ctx[CpuRegister.Rax] = unchecked((ulong)value);
+        return value;
+    }
+
     private static void TraceEventFlag(string message)
     {
-        if (string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_EVENT_FLAG"), "1", StringComparison.Ordinal))
+        if (_traceEventFlag)
         {
             Console.Error.WriteLine($"[LOADER][TRACE] event_flag.{message}");
         }
@@ -684,7 +654,7 @@ public static class KernelEventFlagCompatExports
 
     private static void AppendByte(StringBuilder builder, CpuContext ctx, ulong address, string name)
     {
-        if (ctx.TryReadByte(address, out var value))
+        if (TryReadByte(ctx, address, out var value))
         {
             builder.Append($" {name}=0x{value:X2}");
         }
@@ -692,7 +662,7 @@ public static class KernelEventFlagCompatExports
 
     private static void AppendUInt32(StringBuilder builder, CpuContext ctx, ulong address, string name)
     {
-        if (ctx.TryReadUInt32(address, out var value))
+        if (TryReadUInt32(ctx, address, out var value))
         {
             builder.Append($" {name}=0x{value:X8}");
         }
@@ -700,7 +670,7 @@ public static class KernelEventFlagCompatExports
 
     private static void AppendUInt64(StringBuilder builder, CpuContext ctx, ulong address, string name)
     {
-        if (ctx.TryReadUInt64(address, out var value))
+        if (TryReadUInt64(ctx, address, out var value))
         {
             builder.Append($" {name}=0x{value:X16}");
         }

src/SharpEmu.Libs/Kernel/KernelEventQueueCompatExports.cs

@@ -395,13 +395,13 @@ public static class KernelEventQueueCompatExports
         }
 
         uint timeoutUsec = 0;
-        if (timeoutAddress != 0 && !ctx.TryReadUInt32(timeoutAddress, out timeoutUsec))
+        if (timeoutAddress != 0 && !TryReadUInt32(ctx, timeoutAddress, out timeoutUsec))
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
         }
 
         var deliveredCount = DequeueEvents(ctx, handle, eventsAddress, eventCapacity);
-        if (outCountAddress != 0 && !ctx.TryWriteUInt32(outCountAddress, (uint)deliveredCount))
+        if (outCountAddress != 0 && !TryWriteUInt32(ctx, outCountAddress, (uint)deliveredCount))
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
         }
@@ -450,7 +450,7 @@ public static class KernelEventQueueCompatExports
             }
 
             deliveredCount = DequeueEvents(ctx, handle, eventsAddress, eventCapacity);
-            if (outCountAddress != 0 && !ctx.TryWriteUInt32(outCountAddress, (uint)deliveredCount))
+            if (outCountAddress != 0 && !TryWriteUInt32(ctx, outCountAddress, (uint)deliveredCount))
             {
                 return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
             }
@@ -649,6 +649,60 @@ public static class KernelEventQueueCompatExports
         return triggeredCount;
     }
 
+    /// <summary>
+    /// Queues one event for every registration using <paramref name="filter"/>.
+    /// Unlike <see cref="TriggerRegisteredEvents"/>, this preserves distinct
+    /// event identifiers registered on the same queue. AGC driver completion
+    /// queues use this form because the driver, rather than a packet-provided
+    /// identifier, announces that the whole submission reached end-of-pipe.
+    /// </summary>
+    public static int TriggerRegisteredEventsDistinct(short filter)
+    {
+        HashSet<ulong>? wakeHandles = null;
+        var triggeredCount = 0;
+        lock (_eventQueueGate)
+        {
+            foreach (var (handle, registrations) in _registeredEvents)
+            {
+                foreach (var registration in registrations.Values)
+                {
+                    if (registration.Filter != filter)
+                    {
+                        continue;
+                    }
+
+                    if (!_pendingEvents.TryGetValue(handle, out var queue))
+                    {
+                        queue = new KernelEventDeque();
+                        _pendingEvents[handle] = queue;
+                    }
+
+                    QueueOrUpdateEvent(
+                        queue,
+                        new KernelQueuedEvent(
+                            registration.Ident,
+                            registration.Filter,
+                            0,
+                            1,
+                            registration.Ident,
+                            registration.UserData));
+                    (wakeHandles ??= []).Add(handle);
+                    triggeredCount++;
+                }
+            }
+        }
+
+        if (wakeHandles is not null)
+        {
+            foreach (var handle in wakeHandles)
+            {
+                WakeEventQueue(handle);
+            }
+        }
+
+        return triggeredCount;
+    }
+
     private static bool TriggerRegisteredEvent(
         ulong handle,
         ulong ident,
@@ -752,7 +806,7 @@ public static class KernelEventQueueCompatExports
         ulong outCountAddress)
     {
         var deliveredCount = DequeueEvents(ctx, handle, eventsAddress, eventCapacity);
-        if (outCountAddress != 0 && !ctx.TryWriteUInt32(outCountAddress, (uint)deliveredCount))
+        if (outCountAddress != 0 && !TryWriteUInt32(ctx, outCountAddress, (uint)deliveredCount))
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
         }
@@ -865,8 +919,29 @@ public static class KernelEventQueueCompatExports
             return;
         }
 
-        _ = ctx.TryReadUInt64(ctx[CpuRegister.Rsp], out ulong returnRip);
+        var returnRip = 0UL;
+        _ = ctx.TryReadUInt64(ctx[CpuRegister.Rsp], out returnRip);
         Console.Error.WriteLine(
-            $"[LOADER][TRACE] equeue.{operation}: thread=0x{KernelPthreadState.GetCurrentThreadHandle():X16} handle=0x{handle:X16} rsi=0x{ctx[CpuRegister.Rsi]:X16} rdx=0x{ctx[CpuRegister.Rdx]:X16} ret=0x{returnRip:X16}");
+            $"[LOADER][TRACE] equeue.{operation}: handle=0x{handle:X16} rsi=0x{ctx[CpuRegister.Rsi]:X16} rdx=0x{ctx[CpuRegister.Rdx]:X16} ret=0x{returnRip:X16}");
+    }
+
+    private static bool TryWriteUInt32(CpuContext ctx, ulong address, uint value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(uint)];
+        BinaryPrimitives.WriteUInt32LittleEndian(buffer, value);
+        return ctx.Memory.TryWrite(address, buffer);
+    }
+
+    private static bool TryReadUInt32(CpuContext ctx, ulong address, out uint value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(uint)];
+        if (!ctx.Memory.TryRead(address, buffer))
+        {
+            value = 0;
+            return false;
+        }
+
+        value = BinaryPrimitives.ReadUInt32LittleEndian(buffer);
+        return true;
     }
 }

src/SharpEmu.Libs/Kernel/KernelExceptionCompatExports.cs

@@ -62,4 +62,75 @@ public static class KernelExceptionCompatExports
         ctx[CpuRegister.Rax] = 0;
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
+
+    [SysAbiExport(
+        Nid = "il03nluKfMk",
+        ExportName = "sceKernelRaiseException",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libKernel")]
+    public static int RaiseException(CpuContext ctx)
+    {
+        var targetThread = ctx[CpuRegister.Rdi];
+        var exceptionType = unchecked((int)ctx[CpuRegister.Rsi]);
+        if (targetThread == 0 || exceptionType is < 0 or >= 128)
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        ulong handler;
+        lock (_gate)
+        {
+            if (!_installedHandlers.TryGetValue(exceptionType, out handler))
+            {
+                // The kernel accepts a raise for a type with no process
+                // handler; there is simply no user callback to deliver.
+                return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
+            }
+        }
+
+        if (string.Equals(
+                Environment.GetEnvironmentVariable("SHARPEMU_IGNORE_GUEST_EXCEPTIONS"),
+                "1",
+                StringComparison.Ordinal))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
+        }
+
+        var scheduler = GuestThreadExecution.Scheduler;
+        string? error = null;
+        if (scheduler is null ||
+            !scheduler.TryRaiseGuestException(
+                ctx,
+                targetThread,
+                handler,
+                exceptionType,
+                out error))
+        {
+            Console.Error.WriteLine(
+                $"[LOADER][WARN] sceKernelRaiseException delivery failed: " +
+                $"target=0x{targetThread:X16} type=0x{exceptionType:X2} " +
+                $"error={error ?? "scheduler unavailable"}");
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_BUSY);
+        }
+
+        if (string.Equals(
+                Environment.GetEnvironmentVariable("SHARPEMU_LOG_GUEST_EXCEPTIONS"),
+                "1",
+                StringComparison.Ordinal))
+        {
+            Console.Error.WriteLine(
+                $"[LOADER][TRACE] guest_exception.raise " +
+                $"target=0x{targetThread:X16} type=0x{exceptionType:X2} " +
+                $"handler=0x{handler:X16}");
+        }
+
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
+    }
+
+    private static int SetReturn(CpuContext ctx, OrbisGen2Result result)
+    {
+        var value = (int)result;
+        ctx[CpuRegister.Rax] = unchecked((ulong)value);
+        return value;
+    }
 }

src/SharpEmu.Libs/Kernel/KernelExports.cs

@@ -13,8 +13,6 @@ public static class KernelExports
     private static readonly object _coredumpGate = new();
     private static ulong _coredumpHandler;
     private static ulong _coredumpHandlerContext;
-    private const uint Gen4CompiledSdkVersion = 0x05000000;
-    private const uint Gen5CompiledSdkVersion = 0x09000000;
 
     private readonly record struct CxaDestructorEntry(
         ulong Function,
@@ -28,24 +26,7 @@ public static class KernelExports
         LibraryName = "libKernel")]
     public static int KernelGetCompiledSdkVersion(CpuContext ctx)
     {
-        var versionAddress = ctx[CpuRegister.Rdi];
-        if (versionAddress == 0)
-        {
-            ctx[CpuRegister.Rax] = unchecked((ulong)(int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
-            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
-        }
-
-        var sdkVersion = ctx.TargetGeneration == Generation.Gen5
-            ? Gen5CompiledSdkVersion
-            : Gen4CompiledSdkVersion;
-
-        if (!ctx.TryWriteUInt32(versionAddress, sdkVersion))
-        {
-            ctx[CpuRegister.Rax] = unchecked((ulong)(int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
-            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
-        }
-
-        ctx[CpuRegister.Rax] = 0;
+        _ = ctx;
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
 
@@ -71,20 +52,12 @@ public static class KernelExports
         ExportName = "exit",
         Target = Generation.Gen4 | Generation.Gen5,
         LibraryName = "libKernel")]
-    public static int Exit(CpuContext ctx) => RequestProcessExit(ctx, "exit");
-
-    [SysAbiExport(
-        Nid = "L1SBTkC+Cvw",
-        ExportName = "abort",
-        Target = Generation.Gen4 | Generation.Gen5,
-        LibraryName = "libc")]
-    public static int Abort(CpuContext ctx)
+    public static int Exit(CpuContext ctx)
     {
-        // Route through the same graceful guest-entry-exit path as exit(): letting the call
-        // fall through to the host's native abort() does not unwind the guest thread cleanly.
-        Console.Error.WriteLine("[LOADER][INFO] abort() called by guest - terminating");
-        GuestThreadExecution.RequestCurrentEntryExit("abort", -1);
-        ctx[CpuRegister.Rax] = unchecked((ulong)(-1L));
+        var status = unchecked((int)ctx[CpuRegister.Rdi]);
+        Console.Error.WriteLine($"[LOADER][INFO] exit(status={status})");
+        GuestThreadExecution.RequestCurrentEntryExit("exit", status);
+        ctx[CpuRegister.Rax] = unchecked((ulong)status);
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
 
@@ -199,7 +172,11 @@ public static class KernelExports
         ExportName = "_exit",
         Target = Generation.Gen4 | Generation.Gen5,
         LibraryName = "libKernel")]
-    public static int UnderscoreExit(CpuContext ctx) => RequestProcessExit(ctx, "_exit");
+    public static int UnderscoreExit(CpuContext ctx)
+    {
+        _ = ctx;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
 
     [SysAbiExport(
         Nid = "Ac86z8q7T8A",
@@ -218,12 +195,14 @@ public static class KernelExports
         Target = Generation.Gen4 | Generation.Gen5,
         LibraryName = "libKernel")]
     public static int PthreadCreate(CpuContext ctx)
+        => PthreadCreateCore(ctx, ctx[CpuRegister.R8]);
+
+    private static int PthreadCreateCore(CpuContext ctx, ulong nameAddress)
     {
         var threadIdAddress = ctx[CpuRegister.Rdi];
         var attrAddress = ctx[CpuRegister.Rsi];
         var entryAddress = ctx[CpuRegister.Rdx];
         var argument = ctx[CpuRegister.Rcx];
-        var nameAddress = ctx[CpuRegister.R8];
         var name = nameAddress == 0 ? string.Empty : ReadCString(ctx, nameAddress, 256);
         var threadHandle = KernelPthreadState.CreateThreadHandle(name);
         KernelPthreadExtendedCompatExports.GetThreadStartScheduling(
@@ -278,14 +257,20 @@ public static class KernelExports
         ExportName = "pthread_create",
         Target = Generation.Gen4 | Generation.Gen5,
         LibraryName = "libKernel")]
-    public static int PosixPthreadCreate(CpuContext ctx) => PthreadCreate(ctx);
+    public static int PosixPthreadCreate(CpuContext ctx)
+    {
+        return PthreadCreateCore(ctx, nameAddress: 0);
+    }
 
     [SysAbiExport(
         Nid = "Jmi+9w9u0E4",
         ExportName = "pthread_create_name_np",
         Target = Generation.Gen4 | Generation.Gen5,
         LibraryName = "libKernel")]
-    public static int PosixPthreadCreateNameNp(CpuContext ctx) => PthreadCreate(ctx);
+    public static int PosixPthreadCreateNameNp(CpuContext ctx)
+    {
+        return PthreadCreateCore(ctx, ctx[CpuRegister.R8]);
+    }
 
     [SysAbiExport(
         Nid = "3kg7rT0NQIs",
@@ -295,6 +280,9 @@ public static class KernelExports
     public static int PthreadExit(CpuContext ctx)
     {
         var value = ctx[CpuRegister.Rdi];
+        // Run cleanup on the still-executable thread before unwinding it.
+        KernelPthreadExtendedCompatExports.RunThreadLocalDestructors(ctx);
+        KernelMemoryCompatExports.RunThreadDtors(ctx);
         GuestThreadExecution.RequestCurrentEntryExit("scePthreadExit", value);
         ctx[CpuRegister.Rax] = value;
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
@@ -308,6 +296,8 @@ public static class KernelExports
     public static int PosixPthreadExit(CpuContext ctx)
     {
         var value = ctx[CpuRegister.Rdi];
+        KernelPthreadExtendedCompatExports.RunThreadLocalDestructors(ctx);
+        KernelMemoryCompatExports.RunThreadDtors(ctx);
         GuestThreadExecution.RequestCurrentEntryExit("pthread_exit", value);
         ctx[CpuRegister.Rax] = value;
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
@@ -362,7 +352,10 @@ public static class KernelExports
         ExportName = "pthread_join",
         Target = Generation.Gen4 | Generation.Gen5,
         LibraryName = "libKernel")]
-    public static int PosixPthreadJoin(CpuContext ctx) => PthreadJoin(ctx);
+    public static int PosixPthreadJoin(CpuContext ctx)
+    {
+        return PthreadJoin(ctx);
+    }
 
     [SysAbiExport(
         Nid = "wuCroIGjt2g",
@@ -437,14 +430,21 @@ public static class KernelExports
     private static string ReadCString(CpuContext ctx, ulong address, int maxLen)
     {
         Span<byte> buf = stackalloc byte[maxLen];
-        if (!ctx.Memory.TryRead(address, buf))
-            return $"<unreadable 0x{address:X16}>";
+        Span<byte> one = stackalloc byte[1];
+        var len = 0;
+        while (len < buf.Length)
+        {
+            if (!ctx.Memory.TryRead(address + (ulong)len, one))
+                return len == 0 ? $"<unreadable 0x{address:X16}>" : System.Text.Encoding.UTF8.GetString(buf[..len]);
 
-        int len = 0;
-        while (len < buf.Length && buf[len] != 0) len++;
+            if (one[0] == 0)
+                break;
 
-        try { return System.Text.Encoding.UTF8.GetString(buf.Slice(0, len)); }
-        catch { return System.Text.Encoding.ASCII.GetString(buf.Slice(0, len)); }
+            buf[len++] = one[0];
+        }
+
+        try { return System.Text.Encoding.UTF8.GetString(buf[..len]); }
+        catch { return System.Text.Encoding.ASCII.GetString(buf[..len]); }
     }
 
     private static bool ShouldTracePthread()
@@ -452,19 +452,18 @@ public static class KernelExports
         return string.Equals(Environment.GetEnvironmentVariable("SHARPEMU_LOG_PTHREADS"), "1", StringComparison.Ordinal);
     }
 
-    private static int RequestProcessExit(CpuContext ctx, string syscallName)
+    [SysAbiExport(
+        Nid = "L1SBTkC+Cvw",
+        ExportName = "abort",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libc")]
+    public static int Abort(CpuContext ctx)
     {
-        var status = unchecked((int)ctx[CpuRegister.Rdi]);
-        Console.Error.WriteLine($"[LOADER][INFO] {syscallName}(status={status})");
-        GuestThreadExecution.RequestCurrentEntryExit(syscallName, status);
-        ctx[CpuRegister.Rax] = unchecked((ulong)status);
+        // Route through the same graceful guest-entry-exit path as exit(): letting the call
+        // fall through to the host's native abort() does not unwind the guest thread cleanly.
+        Console.Error.WriteLine("[LOADER][INFO] abort() called by guest - terminating");
+        GuestThreadExecution.RequestCurrentEntryExit("abort", -1);
+        ctx[CpuRegister.Rax] = unchecked((ulong)(-1L));
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
-
-    // NOTE: "SHtAad20YYM"/"DIxvoy7Ngvk" are sce::Json::Value::getType/getInteger, and
-    // "3GPpjQdAMTw"/"9rAeANT2tyE"/"tsvEmnenz48" are __cxa_guard_acquire/__cxa_guard_release/
-    // __cxa_atexit (verified by hashing against scripts/ps5_names.txt). Do not register them
-    // here as kernel mutex functions: the cxa guards are implemented in CxxAbiExports.cs and
-    // shadowing them breaks every C++ static-init guard in the game.
-
 }

src/SharpEmu.Libs/Kernel/KernelFileExtendedExports.cs

@@ -0,0 +1,662 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.HLE;
+using System.Buffers.Binary;
+using System.Collections.Concurrent;
+using System.Threading;
+
+namespace SharpEmu.Libs.Kernel;
+
+/// <summary>
+/// Positional and scatter/gather file I/O, synchronization, renaming, fcntl,
+/// polling and asynchronous I/O (AIO) that complement the base file exports.
+/// These share the same guest FD table and path-resolution helpers via the
+/// partial <see cref="KernelMemoryCompatExports"/> class.
+/// </summary>
+public static partial class KernelMemoryCompatExports
+{
+    // fcntl commands (FreeBSD numbering used by the PS4/PS5 libc).
+    private const int F_DUPFD = 0;
+    private const int F_GETFD = 1;
+    private const int F_SETFD = 2;
+    private const int F_GETFL = 3;
+    private const int F_SETFL = 4;
+
+    // poll event bits.
+    private const short POLLIN = 0x0001;
+    private const short POLLOUT = 0x0004;
+
+    // AIO request state (SCE_KERNEL_AIO_STATE_*).
+    private const uint AioStateCompleted = 3;
+    private const int SizeofAioRwRequest = 40;
+
+    private static long _nextAioSubmitId = 1;
+    private static readonly ConcurrentDictionary<uint, int> _aioResults = new();
+
+    private static FileStream? GetOpenFile(int fd)
+    {
+        lock (_fdGate)
+        {
+            return _openFiles.TryGetValue(fd, out var stream) ? stream : null;
+        }
+    }
+
+    // ---- Positional read/write (do not move the file offset) ----
+
+    [SysAbiExport(Nid = "ezv-RSBNKqI", ExportName = "pread",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixPread(CpuContext ctx) => KernelPreadCore(ctx);
+
+    [SysAbiExport(Nid = "+r3rMFwItV4", ExportName = "sceKernelPread",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelPread(CpuContext ctx) => KernelPreadCore(ctx);
+
+    private static int KernelPreadCore(CpuContext ctx)
+    {
+        var fd = unchecked((int)ctx[CpuRegister.Rdi]);
+        var bufferAddress = ctx[CpuRegister.Rsi];
+        var requested = (int)Math.Min(ctx[CpuRegister.Rdx], int.MaxValue);
+        var offset = unchecked((long)ctx[CpuRegister.Rcx]);
+        if (requested < 0 || (requested > 0 && bufferAddress == 0) || offset < 0)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        var stream = GetOpenFile(fd);
+        if (stream is null)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND;
+        }
+
+        if (requested == 0)
+        {
+            ctx[CpuRegister.Rax] = 0;
+            return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+        }
+
+        var buffer = GC.AllocateUninitializedArray<byte>(requested);
+        int read;
+        try
+        {
+            read = RandomAccess.Read(stream.SafeFileHandle, buffer, offset);
+        }
+        catch (IOException)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        if (read > 0 && !ctx.Memory.TryWrite(bufferAddress, buffer.AsSpan(0, read)))
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
+        }
+
+        ctx[CpuRegister.Rax] = unchecked((ulong)read);
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    [SysAbiExport(Nid = "C2kJ-byS5rM", ExportName = "pwrite",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixPwrite(CpuContext ctx) => KernelPwriteCore(ctx);
+
+    [SysAbiExport(Nid = "nKWi-N2HBV4", ExportName = "sceKernelPwrite",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelPwrite(CpuContext ctx) => KernelPwriteCore(ctx);
+
+    private static int KernelPwriteCore(CpuContext ctx)
+    {
+        var fd = unchecked((int)ctx[CpuRegister.Rdi]);
+        var bufferAddress = ctx[CpuRegister.Rsi];
+        var requested = (int)Math.Min(ctx[CpuRegister.Rdx], int.MaxValue);
+        var offset = unchecked((long)ctx[CpuRegister.Rcx]);
+        if (requested < 0 || (requested > 0 && bufferAddress == 0) || offset < 0)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        var stream = GetOpenFile(fd);
+        if (stream is null)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND;
+        }
+
+        if (requested == 0)
+        {
+            ctx[CpuRegister.Rax] = 0;
+            return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+        }
+
+        var payload = GC.AllocateUninitializedArray<byte>(requested);
+        if (!ctx.Memory.TryRead(bufferAddress, payload))
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
+        }
+
+        try
+        {
+            RandomAccess.Write(stream.SafeFileHandle, payload, offset);
+        }
+        catch (IOException)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        ctx[CpuRegister.Rax] = unchecked((ulong)requested);
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    // ---- Synchronization ----
+
+    [SysAbiExport(Nid = "juWbTNM+8hw", ExportName = "fsync",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixFsync(CpuContext ctx) => KernelFsyncCore(ctx);
+
+    [SysAbiExport(Nid = "fTx66l5iWIA", ExportName = "sceKernelFsync",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelFsync(CpuContext ctx) => KernelFsyncCore(ctx);
+
+    [SysAbiExport(Nid = "KIbJFQ0I1Cg", ExportName = "fdatasync",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixFdatasync(CpuContext ctx) => KernelFsyncCore(ctx);
+
+    [SysAbiExport(Nid = "30Rh4ixbKy4", ExportName = "sceKernelFdatasync",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelFdatasync(CpuContext ctx) => KernelFsyncCore(ctx);
+
+    private static int KernelFsyncCore(CpuContext ctx)
+    {
+        var fd = unchecked((int)ctx[CpuRegister.Rdi]);
+        var stream = GetOpenFile(fd);
+        if (stream is null)
+        {
+            if (fd is 0 or 1 or 2)
+            {
+                ctx[CpuRegister.Rax] = 0;
+                return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+            }
+
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND;
+        }
+
+        try
+        {
+            stream.Flush(flushToDisk: true);
+        }
+        catch (IOException)
+        {
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    [SysAbiExport(Nid = "Y2OqwJQ3lr8", ExportName = "sync",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixSync(CpuContext ctx)
+    {
+        lock (_fdGate)
+        {
+            foreach (var stream in _openFiles.Values)
+            {
+                try { stream.Flush(flushToDisk: true); } catch (IOException) { }
+            }
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    // ---- Truncation ----
+
+    [SysAbiExport(Nid = "ih4CD9-gghM", ExportName = "ftruncate",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixFtruncate(CpuContext ctx) => KernelFtruncateCore(ctx);
+
+    [SysAbiExport(Nid = "VW3TVZiM4-E", ExportName = "sceKernelFtruncate",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelFtruncate(CpuContext ctx) => KernelFtruncateCore(ctx);
+
+    private static int KernelFtruncateCore(CpuContext ctx)
+    {
+        var fd = unchecked((int)ctx[CpuRegister.Rdi]);
+        var length = unchecked((long)ctx[CpuRegister.Rsi]);
+        if (length < 0)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        var stream = GetOpenFile(fd);
+        if (stream is null)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND;
+        }
+
+        try
+        {
+            stream.SetLength(length);
+        }
+        catch (IOException)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    [SysAbiExport(Nid = "ayrtszI7GBg", ExportName = "truncate",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixTruncate(CpuContext ctx) => KernelTruncateCore(ctx);
+
+    [SysAbiExport(Nid = "WlyEA-sLDf0", ExportName = "sceKernelTruncate",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelTruncate(CpuContext ctx) => KernelTruncateCore(ctx);
+
+    private static int KernelTruncateCore(CpuContext ctx)
+    {
+        var pathAddress = ctx[CpuRegister.Rdi];
+        var length = unchecked((long)ctx[CpuRegister.Rsi]);
+        if (length < 0 || !TryReadNullTerminatedUtf8(ctx, pathAddress, MaxGuestStringLength, out var guestPath))
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        if (IsReadOnlyGuestMutationPath(guestPath))
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_PERMISSION_DENIED;
+        }
+
+        var hostPath = ResolveGuestPath(guestPath);
+        try
+        {
+            using var stream = new FileStream(hostPath, FileMode.Open, FileAccess.Write, FileShare.ReadWrite);
+            stream.SetLength(length);
+        }
+        catch (FileNotFoundException)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND;
+        }
+        catch (IOException)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    // ---- Rename ----
+
+    [SysAbiExport(Nid = "NN01qLRhiqU", ExportName = "rename",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixRename(CpuContext ctx) => KernelRenameCore(ctx);
+
+    [SysAbiExport(Nid = "52NcYU9+lEo", ExportName = "sceKernelRename",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelRename(CpuContext ctx) => KernelRenameCore(ctx);
+
+    private static int KernelRenameCore(CpuContext ctx)
+    {
+        if (!TryReadNullTerminatedUtf8(ctx, ctx[CpuRegister.Rdi], MaxGuestStringLength, out var fromGuest) ||
+            !TryReadNullTerminatedUtf8(ctx, ctx[CpuRegister.Rsi], MaxGuestStringLength, out var toGuest))
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
+        }
+
+        if (IsReadOnlyGuestMutationPath(fromGuest) || IsReadOnlyGuestMutationPath(toGuest))
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_PERMISSION_DENIED;
+        }
+
+        var fromHost = ResolveGuestPath(fromGuest);
+        var toHost = ResolveGuestPath(toGuest);
+        try
+        {
+            if (Directory.Exists(fromHost))
+            {
+                Directory.Move(fromHost, toHost);
+            }
+            else
+            {
+                File.Move(fromHost, toHost, overwrite: true);
+            }
+        }
+        catch (FileNotFoundException)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND;
+        }
+        catch (DirectoryNotFoundException)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND;
+        }
+        catch (IOException)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        InvalidateNegativeStatCacheForPathAndAncestors(toGuest);
+        AddNegativeStatCacheForGuestPath(fromGuest);
+        InvalidateAprFileSizeCache(fromHost);
+        InvalidateAprFileSizeCache(toHost);
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    // ---- Descriptor duplication ----
+
+    [SysAbiExport(Nid = "iiQjzvfWDq0", ExportName = "dup",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixDup(CpuContext ctx)
+    {
+        var fd = unchecked((int)ctx[CpuRegister.Rdi]);
+        lock (_fdGate)
+        {
+            if (!_openFiles.TryGetValue(fd, out var stream))
+            {
+                return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND;
+            }
+
+            // POSIX dup shares the open file description (and offset), which is
+            // exactly the shared FileStream reference.
+            var newFd = (int)Interlocked.Increment(ref _nextFileDescriptor);
+            _openFiles[newFd] = stream;
+            ctx[CpuRegister.Rax] = unchecked((ulong)newFd);
+        }
+
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    [SysAbiExport(Nid = "wdUufa9g-D8", ExportName = "dup2",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixDup2(CpuContext ctx)
+    {
+        var oldFd = unchecked((int)ctx[CpuRegister.Rdi]);
+        var newFd = unchecked((int)ctx[CpuRegister.Rsi]);
+        lock (_fdGate)
+        {
+            if (!_openFiles.TryGetValue(oldFd, out var stream))
+            {
+                return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND;
+            }
+
+            if (oldFd == newFd)
+            {
+                ctx[CpuRegister.Rax] = unchecked((ulong)newFd);
+                return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+            }
+
+            // If newFd names an open file, dup2 closes it first.
+            if (_openFiles.TryGetValue(newFd, out var existing) && !ReferenceEquals(existing, stream))
+            {
+                try { existing.Dispose(); } catch (IOException) { }
+            }
+
+            _openFiles[newFd] = stream;
+            ctx[CpuRegister.Rax] = unchecked((ulong)newFd);
+        }
+
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    // ---- fcntl ----
+
+    [SysAbiExport(Nid = "8nY19bKoiZk", ExportName = "fcntl",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixFcntl(CpuContext ctx) => KernelFcntlCore(ctx);
+
+    [SysAbiExport(Nid = "SoZkxZkCHaw", ExportName = "sceKernelFcntl",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelFcntl(CpuContext ctx) => KernelFcntlCore(ctx);
+
+    private static int KernelFcntlCore(CpuContext ctx)
+    {
+        var fd = unchecked((int)ctx[CpuRegister.Rdi]);
+        var command = unchecked((int)ctx[CpuRegister.Rsi]);
+        var argument = unchecked((int)ctx[CpuRegister.Rdx]);
+
+        switch (command)
+        {
+            case F_DUPFD:
+                lock (_fdGate)
+                {
+                    if (!_openFiles.TryGetValue(fd, out var stream))
+                    {
+                        return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND;
+                    }
+
+                    var newFd = Math.Max((int)Interlocked.Increment(ref _nextFileDescriptor), argument);
+                    _openFiles[newFd] = stream;
+                    ctx[CpuRegister.Rax] = unchecked((ulong)newFd);
+                }
+
+                return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+
+            case F_GETFD:
+            case F_GETFL:
+                // No close-on-exec / status flags are tracked; report cleared.
+                ctx[CpuRegister.Rax] = 0;
+                return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+
+            case F_SETFD:
+            case F_SETFL:
+                ctx[CpuRegister.Rax] = 0;
+                return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+
+            default:
+                ctx[CpuRegister.Rax] = 0;
+                return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+        }
+    }
+
+    // ---- poll / select ----
+    // Regular files are always ready for both read and write, so report every
+    // requested descriptor as immediately ready.
+
+    [SysAbiExport(Nid = "ku7D4q1Y9PI", ExportName = "poll",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixPoll(CpuContext ctx)
+    {
+        var fdsAddress = ctx[CpuRegister.Rdi];
+        var count = unchecked((uint)ctx[CpuRegister.Rsi]);
+        if (fdsAddress == 0 || count == 0)
+        {
+            ctx[CpuRegister.Rax] = 0;
+            return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+        }
+
+        // struct pollfd { int fd; short events; short revents; } == 8 bytes.
+        var ready = 0;
+        Span<byte> buffer = stackalloc byte[8];
+        for (uint i = 0; i < count && i < 4096; i++)
+        {
+            var entry = fdsAddress + i * 8;
+            if (!ctx.Memory.TryRead(entry, buffer))
+            {
+                break;
+            }
+
+            var events = BinaryPrimitives.ReadInt16LittleEndian(buffer[4..]);
+            var revents = (short)(events & (POLLIN | POLLOUT));
+            BinaryPrimitives.WriteInt16LittleEndian(buffer[6..], revents);
+            if (revents != 0)
+            {
+                ready++;
+            }
+
+            _ = ctx.Memory.TryWrite(entry, buffer);
+        }
+
+        ctx[CpuRegister.Rax] = unchecked((ulong)ready);
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    [SysAbiExport(Nid = "T8fER+tIGgk", ExportName = "select",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int PosixSelect(CpuContext ctx)
+    {
+        // nfds in Rdi; the fd_sets are left as-is (all reported ready) and the
+        // ready count returned is nfds so callers proceed without blocking.
+        var nfds = unchecked((int)ctx[CpuRegister.Rdi]);
+        ctx[CpuRegister.Rax] = unchecked((ulong)Math.Max(nfds, 0));
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    // ---- Asynchronous I/O (executed synchronously) ----
+
+    [SysAbiExport(Nid = "HgX7+AORI58", ExportName = "sceKernelAioSubmitReadCommands",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelAioSubmitReadCommands(CpuContext ctx) => KernelAioSubmit(ctx, write: false);
+
+    [SysAbiExport(Nid = "lXT0m3P-vs4", ExportName = "sceKernelAioSubmitReadCommandsMultiple",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelAioSubmitReadCommandsMultiple(CpuContext ctx) => KernelAioSubmit(ctx, write: false);
+
+    [SysAbiExport(Nid = "XQ8C8y+de+E", ExportName = "sceKernelAioSubmitWriteCommands",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelAioSubmitWriteCommands(CpuContext ctx) => KernelAioSubmit(ctx, write: true);
+
+    private static int KernelAioSubmit(CpuContext ctx, bool write)
+    {
+        var requestsAddress = ctx[CpuRegister.Rdi];
+        var count = unchecked((int)ctx[CpuRegister.Rsi]);
+        var outIdAddress = ctx[CpuRegister.Rcx];
+        if (requestsAddress == 0 || count <= 0 || count > 0x10000)
+        {
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
+        }
+
+        // Each SceKernelAioRWRequest: offset(8) nbyte(8) buf(8) result(8) fd(4).
+        Span<byte> request = stackalloc byte[SizeofAioRwRequest];
+        Span<byte> result = stackalloc byte[16];
+        for (var i = 0; i < count; i++)
+        {
+            var entry = requestsAddress + (ulong)(i * SizeofAioRwRequest);
+            if (!ctx.Memory.TryRead(entry, request))
+            {
+                break;
+            }
+
+            var offset = BinaryPrimitives.ReadInt64LittleEndian(request[0..]);
+            var nbyte = (int)Math.Min(BinaryPrimitives.ReadUInt64LittleEndian(request[8..]), int.MaxValue);
+            var buf = BinaryPrimitives.ReadUInt64LittleEndian(request[16..]);
+            var resultPtr = BinaryPrimitives.ReadUInt64LittleEndian(request[24..]);
+            var fd = BinaryPrimitives.ReadInt32LittleEndian(request[32..]);
+
+            long transferred = KernelAioTransfer(ctx, fd, offset, nbyte, buf, write);
+            if (resultPtr != 0)
+            {
+                BinaryPrimitives.WriteInt64LittleEndian(result[0..], transferred);
+                BinaryPrimitives.WriteUInt32LittleEndian(result[8..], AioStateCompleted);
+                _ = ctx.Memory.TryWrite(resultPtr, result);
+            }
+        }
+
+        var submitId = unchecked((uint)Interlocked.Increment(ref _nextAioSubmitId));
+        _aioResults[submitId] = 0;
+        if (outIdAddress != 0)
+        {
+            Span<byte> idBuffer = stackalloc byte[sizeof(uint)];
+            BinaryPrimitives.WriteUInt32LittleEndian(idBuffer, submitId);
+            _ = ctx.Memory.TryWrite(outIdAddress, idBuffer);
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    private static long KernelAioTransfer(CpuContext ctx, int fd, long offset, int nbyte, ulong buf, bool write)
+    {
+        if (nbyte <= 0 || buf == 0 || offset < 0)
+        {
+            return 0;
+        }
+
+        var stream = GetOpenFile(fd);
+        if (stream is null)
+        {
+            return -1;
+        }
+
+        var scratch = GC.AllocateUninitializedArray<byte>(nbyte);
+        try
+        {
+            if (write)
+            {
+                if (!ctx.Memory.TryRead(buf, scratch))
+                {
+                    return -1;
+                }
+
+                RandomAccess.Write(stream.SafeFileHandle, scratch, offset);
+                return nbyte;
+            }
+
+            var read = RandomAccess.Read(stream.SafeFileHandle, scratch, offset);
+            if (read > 0 && !ctx.Memory.TryWrite(buf, scratch.AsSpan(0, read)))
+            {
+                return -1;
+            }
+
+            return read;
+        }
+        catch (IOException)
+        {
+            return -1;
+        }
+    }
+
+    [SysAbiExport(Nid = "o7O4z3jwKzo", ExportName = "sceKernelAioPollRequests",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelAioPollRequests(CpuContext ctx) => KernelAioComplete(ctx);
+
+    [SysAbiExport(Nid = "lgK+oIWkJyA", ExportName = "sceKernelAioWaitRequests",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelAioWaitRequests(CpuContext ctx) => KernelAioComplete(ctx);
+
+    private static int KernelAioComplete(CpuContext ctx)
+    {
+        // Submission already performed the I/O synchronously, so every request
+        // reports completed. Rsi points at the state-out array, Rdx = count.
+        var statesAddress = ctx[CpuRegister.Rsi];
+        var count = unchecked((int)ctx[CpuRegister.Rdx]);
+        if (statesAddress != 0 && count > 0 && count <= 0x10000)
+        {
+            Span<byte> state = stackalloc byte[sizeof(uint)];
+            BinaryPrimitives.WriteUInt32LittleEndian(state, AioStateCompleted);
+            for (var i = 0; i < count; i++)
+            {
+                _ = ctx.Memory.TryWrite(statesAddress + (ulong)(i * sizeof(uint)), state);
+            }
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    [SysAbiExport(Nid = "fR521KIGgb8", ExportName = "sceKernelAioCancelRequest",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelAioCancelRequest(CpuContext ctx)
+    {
+        // Already completed; report the completed state if an out pointer given.
+        var stateAddress = ctx[CpuRegister.Rsi];
+        if (stateAddress != 0)
+        {
+            Span<byte> state = stackalloc byte[sizeof(uint)];
+            BinaryPrimitives.WriteUInt32LittleEndian(state, AioStateCompleted);
+            _ = ctx.Memory.TryWrite(stateAddress, state);
+        }
+
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+
+    [SysAbiExport(Nid = "5TgME6AYty4", ExportName = "sceKernelAioDeleteRequest",
+        Target = Generation.Gen4 | Generation.Gen5, LibraryName = "libKernel")]
+    public static int KernelAioDeleteRequest(CpuContext ctx)
+    {
+        var submitId = unchecked((uint)ctx[CpuRegister.Rdi]);
+        _aioResults.TryRemove(submitId, out _);
+        ctx[CpuRegister.Rax] = 0;
+        return (int)OrbisGen2Result.ORBIS_GEN2_OK;
+    }
+}

src/SharpEmu.Libs/Kernel/KernelModuleRegistry.cs

@@ -9,8 +9,16 @@ namespace SharpEmu.Libs.Kernel;
 
 public static class KernelModuleRegistry
 {
+    public enum ModuleStartState
+    {
+        NotStarted,
+        Starting,
+        Started,
+    }
+
     private static readonly object _gate = new();
     private static readonly Dictionary<int, ModuleEntry> _modulesByHandle = new();
+    private static readonly Dictionary<int, Dictionary<string, ulong>> _symbolsByHandle = new();
     private static readonly Dictionary<string, int> _handleByPath = new(StringComparer.OrdinalIgnoreCase);
     private static readonly Dictionary<string, int> _handleByName = new(StringComparer.OrdinalIgnoreCase);
     private static readonly Dictionary<int, int> _sysmoduleHandleById = new();
@@ -32,6 +40,11 @@ public static class KernelModuleRegistry
         ulong BaseAddress,
         ulong EndAddress,
         ulong EntryPoint,
+        ulong InitEntryPoint,
+        ulong EhFrameHeaderAddress,
+        ulong EhFrameAddress,
+        ulong EhFrameSize,
+        ModuleStartState StartState,
         bool IsMain,
         bool IsSystemModule);
 
@@ -40,6 +53,7 @@ public static class KernelModuleRegistry
         lock (_gate)
         {
             _modulesByHandle.Clear();
+            _symbolsByHandle.Clear();
             _handleByPath.Clear();
             _handleByName.Clear();
             _sysmoduleHandleById.Clear();
@@ -52,6 +66,10 @@ public static class KernelModuleRegistry
         ulong baseAddress,
         ulong size,
         ulong entryPoint,
+        ulong initEntryPoint,
+        ulong ehFrameHeaderAddress,
+        ulong ehFrameAddress,
+        ulong ehFrameSize,
         bool isMain,
         bool isSystemModule = false)
     {
@@ -67,6 +85,10 @@ public static class KernelModuleRegistry
                     BaseAddress = baseAddress,
                     EndAddress = ComputeEnd(baseAddress, size),
                     EntryPoint = entryPoint,
+                    InitEntryPoint = initEntryPoint,
+                    EhFrameHeaderAddress = ehFrameHeaderAddress,
+                    EhFrameAddress = ehFrameAddress,
+                    EhFrameSize = ehFrameSize,
                     IsMain = existing.IsMain || isMain,
                     IsSystemModule = existing.IsSystemModule || isSystemModule,
                 };
@@ -84,6 +106,11 @@ public static class KernelModuleRegistry
                 BaseAddress: baseAddress,
                 EndAddress: ComputeEnd(baseAddress, size),
                 EntryPoint: entryPoint,
+                InitEntryPoint: initEntryPoint,
+                EhFrameHeaderAddress: ehFrameHeaderAddress,
+                EhFrameAddress: ehFrameAddress,
+                EhFrameSize: ehFrameSize,
+                StartState: ModuleStartState.NotStarted,
                 IsMain: isMain,
                 IsSystemModule: isSystemModule);
             _modulesByHandle[handle] = entry;
@@ -119,6 +146,11 @@ public static class KernelModuleRegistry
                 BaseAddress: 0,
                 EndAddress: 0,
                 EntryPoint: 0,
+                InitEntryPoint: 0,
+                EhFrameHeaderAddress: 0,
+                EhFrameAddress: 0,
+                EhFrameSize: 0,
+                StartState: ModuleStartState.Started,
                 IsMain: false,
                 IsSystemModule: isSystemModule);
             _modulesByHandle[handle] = entry;
@@ -203,6 +235,97 @@ public static class KernelModuleRegistry
         }
     }
 
+    /// <summary>
+    /// Atomically claims a module initializer. A module can be observed while
+    /// it is starting (for recursive loader calls), but its DT_INIT routine is
+    /// executed at most once after a successful start.
+    /// </summary>
+    public static bool TryBeginModuleStart(int handle, out ModuleEntry module)
+    {
+        lock (_gate)
+        {
+            if (!_modulesByHandle.TryGetValue(handle, out module))
+            {
+                return false;
+            }
+
+            if (module.StartState != ModuleStartState.NotStarted)
+            {
+                return false;
+            }
+
+            if (module.InitEntryPoint < 0x10000)
+            {
+                module = module with { StartState = ModuleStartState.Started };
+                _modulesByHandle[handle] = module;
+                return false;
+            }
+
+            module = module with { StartState = ModuleStartState.Starting };
+            _modulesByHandle[handle] = module;
+            return true;
+        }
+    }
+
+    public static void CompleteModuleStart(int handle, bool succeeded)
+    {
+        lock (_gate)
+        {
+            if (!_modulesByHandle.TryGetValue(handle, out var module) ||
+                module.StartState != ModuleStartState.Starting)
+            {
+                return;
+            }
+
+            _modulesByHandle[handle] = module with
+            {
+                StartState = succeeded ? ModuleStartState.Started : ModuleStartState.NotStarted,
+            };
+        }
+    }
+
+    public static void RegisterModuleSymbols(int handle, IReadOnlyDictionary<string, ulong> symbols)
+    {
+        ArgumentNullException.ThrowIfNull(symbols);
+        lock (_gate)
+        {
+            if (!_modulesByHandle.ContainsKey(handle))
+            {
+                return;
+            }
+
+            if (!_symbolsByHandle.TryGetValue(handle, out var destination))
+            {
+                destination = new Dictionary<string, ulong>(StringComparer.Ordinal);
+                _symbolsByHandle[handle] = destination;
+            }
+
+            foreach (var (name, address) in symbols)
+            {
+                if (!string.IsNullOrWhiteSpace(name) && address >= 0x10000)
+                {
+                    destination.TryAdd(name, address);
+                }
+            }
+        }
+    }
+
+    public static bool TryResolveModuleSymbol(int handle, string symbolName, out ulong address)
+    {
+        address = 0;
+        if (string.IsNullOrWhiteSpace(symbolName))
+        {
+            return false;
+        }
+
+        lock (_gate)
+        {
+            return _symbolsByHandle.TryGetValue(handle, out var symbols) &&
+                   symbols.TryGetValue(symbolName, out address) &&
+                   address >= 0x10000;
+        }
+    }
+
     public static bool TryFindByPathOrName(string? modulePathOrName, out ModuleEntry module)
     {
         module = default;

src/SharpEmu.Libs/Kernel/KernelPthreadExtendedCompatExports.cs

@@ -2,8 +2,10 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 using SharpEmu.HLE;
+using System.Buffers.Binary;
 using System.Collections.Concurrent;
 using System.Text;
+using System.Threading;
 using System.Diagnostics.CodeAnalysis;
 
 namespace SharpEmu.Libs.Kernel;
@@ -15,6 +17,8 @@ public static class KernelPthreadExtendedCompatExports
     private const int DefaultDetachState = 0;
     private const ulong DefaultGuardSize = 0x1000UL;
     private const ulong DefaultStackSize = 0x1_00000UL;
+    private const ulong NativeGuestStackSize = 0x20_0000UL;
+    private const ulong NativeGuestStackStride = 0x100_0000UL;
     private const int DefaultInheritSched = 4;
     private const int DefaultSchedPolicy = 1;
     private const int DefaultSchedPriority = DefaultThreadPriority;
@@ -223,6 +227,13 @@ public static class KernelPthreadExtendedCompatExports
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
 
+    [SysAbiExport(
+        Nid = "+U1R4WtXvoc",
+        ExportName = "pthread_detach",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libKernel")]
+    public static int PosixPthreadDetach(CpuContext ctx) => PthreadDetach(ctx);
+
     [SysAbiExport(
         Nid = "How7B8Oet6k",
         ExportName = "scePthreadGetname",
@@ -273,6 +284,7 @@ public static class KernelPthreadExtendedCompatExports
             state.Attributes = state.Attributes with { AffinityMask = mask };
         }
 
+        _ = GuestThreadExecution.Scheduler?.TrySetGuestThreadAffinity(thread, mask);
         ctx[CpuRegister.Rax] = 0;
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
@@ -326,7 +338,7 @@ public static class KernelPthreadExtendedCompatExports
             priority = GetOrCreateThreadStateLocked(thread).Priority;
         }
 
-        if (!ctx.TryWriteInt32(outPriorityAddress, priority))
+        if (!TryWriteInt32(ctx, outPriorityAddress, priority))
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
         }
@@ -354,6 +366,9 @@ public static class KernelPthreadExtendedCompatExports
             GetOrCreateThreadStateLocked(thread).Priority = priority;
         }
 
+        // Apply to the live scheduler thread so runtime priority changes take
+        // effect, not just the local bookkeeping snapshot.
+        _ = GuestThreadExecution.Scheduler?.TrySetGuestThreadPriority(thread, priority);
         ctx[CpuRegister.Rax] = 0;
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
@@ -373,7 +388,7 @@ public static class KernelPthreadExtendedCompatExports
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
         }
 
-        if (!ctx.TryReadInt32(schedParamAddress, out var schedPriority))
+        if (!TryReadInt32(ctx, schedParamAddress, out var schedPriority))
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
         }
@@ -408,9 +423,9 @@ public static class KernelPthreadExtendedCompatExports
     public static int PthreadGetschedparam(CpuContext ctx)
     {
         var thread = ctx[CpuRegister.Rdi];
-        var outPolicyAddress = ctx[CpuRegister.Rsi];
-        var outSchedParamAddress = ctx[CpuRegister.Rdx];
-        if (thread == 0 || outPolicyAddress == 0 || outSchedParamAddress == 0)
+        var policyAddress = ctx[CpuRegister.Rsi];
+        var schedParamAddress = ctx[CpuRegister.Rdx];
+        if (thread == 0 || policyAddress == 0 || schedParamAddress == 0)
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
         }
@@ -424,8 +439,8 @@ public static class KernelPthreadExtendedCompatExports
             priority = state.Priority;
         }
 
-        if (!ctx.TryWriteInt32(outPolicyAddress, policy) ||
-            !ctx.TryWriteInt32(outSchedParamAddress, priority))
+        if (!TryWriteInt32(ctx, policyAddress, policy) ||
+            !TryWriteInt32(ctx, schedParamAddress, priority))
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
         }
@@ -528,6 +543,22 @@ public static class KernelPthreadExtendedCompatExports
         lock (_stateGate)
         {
             var threadState = GetOrCreateThreadStateLocked(thread);
+
+			// The native executor maps guest pthread stacks itself, after the
+			// kernel-facing thread object has been created.  Report that live
+			// mapping when a thread asks for its own attributes.  IL2CPP's
+			// conservative collector uses these two fields to register the stack;
+			// returning the default null address lets it recycle objects that are
+			// still reachable only from guest registers/stack frames.
+			if (thread == KernelPthreadState.GetCurrentThreadHandle() &&
+				TryInferNativeGuestStack(ctx[CpuRegister.Rsp], out var stackAddress))
+			{
+				threadState.Attributes = threadState.Attributes with
+				{
+					StackAddress = stackAddress,
+					StackSize = NativeGuestStackSize,
+				};
+			}
             _attrStates[outAttrAddress] = threadState.Attributes;
         }
 
@@ -535,6 +566,28 @@ public static class KernelPthreadExtendedCompatExports
         return (int)OrbisGen2Result.ORBIS_GEN2_OK;
     }
 
+	private static bool TryInferNativeGuestStack(ulong stackPointer, out ulong stackAddress)
+	{
+		stackAddress = 0;
+		var candidate = stackPointer & ~(NativeGuestStackStride - 1);
+		if (stackPointer - candidate >= NativeGuestStackSize)
+		{
+			return false;
+		}
+
+		var highestStack = OperatingSystem.IsWindows()
+			? 0x00007FFF_F000_0000UL
+			: 0x00006FFF_F000_0000UL;
+		var lowestStack = highestStack - (63 * NativeGuestStackStride);
+		if (candidate < lowestStack || candidate > highestStack)
+		{
+			return false;
+		}
+
+		stackAddress = candidate;
+		return true;
+	}
+
     [SysAbiExport(
         Nid = "8+s5BzZjxSg",
         ExportName = "scePthreadAttrGetaffinity",
@@ -584,7 +637,7 @@ public static class KernelPthreadExtendedCompatExports
             state = GetOrCreateAttrStateLocked(attrAddress);
         }
 
-        if (!ctx.TryWriteInt32(outStateAddress, state.DetachState))
+        if (!TryWriteInt32(ctx, outStateAddress, state.DetachState))
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
         }
@@ -827,7 +880,7 @@ public static class KernelPthreadExtendedCompatExports
             state = GetOrCreateAttrStateLocked(attrAddress);
         }
 
-        if (!ctx.TryWriteInt32(schedParamAddress, state.SchedPriority))
+        if (!TryWriteInt32(ctx, schedParamAddress, state.SchedPriority))
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
         }
@@ -850,7 +903,7 @@ public static class KernelPthreadExtendedCompatExports
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT;
         }
 
-        if (!ctx.TryReadInt32(schedParamAddress, out var schedPriority))
+        if (!TryReadInt32(ctx, schedParamAddress, out var schedPriority))
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
         }
@@ -1207,7 +1260,7 @@ public static class KernelPthreadExtendedCompatExports
             }
         }
 
-        if (!ctx.TryWriteInt32(outKeyAddress, key))
+        if (!TryWriteInt32(ctx, outKeyAddress, key))
         {
             return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT;
         }
@@ -1315,6 +1368,72 @@ public static class KernelPthreadExtendedCompatExports
         LibraryName = "libKernel")]
     public static int OrbisPthreadGetspecific(CpuContext ctx) => PosixPthreadGetspecific(ctx);
 
+    private const int PthreadDestructorIterations = 4;
+
+    /// <summary>
+    /// Runs the current thread's pthread TLS-key destructors, as POSIX
+    /// requires on thread exit. Each key holding a non-null value with a
+    /// registered destructor has its value cleared first and the destructor
+    /// then invoked with the previous value; this repeats up to
+    /// PTHREAD_DESTRUCTOR_ITERATIONS times so destructors that set new
+    /// thread-local values are themselves cleaned up. Called on the exiting
+    /// guest thread while it is still executable.
+    /// </summary>
+    public static void RunThreadLocalDestructors(CpuContext ctx)
+    {
+        var scheduler = GuestThreadExecution.Scheduler;
+        if (scheduler is null)
+        {
+            return;
+        }
+
+        var threadHandle = KernelPthreadState.GetCurrentThreadHandle();
+        if (!_threadLocalSpecific.TryGetValue(threadHandle, out var values))
+        {
+            return;
+        }
+
+        for (var iteration = 0; iteration < PthreadDestructorIterations; iteration++)
+        {
+            var ranAny = false;
+            foreach (var entry in values)
+            {
+                var value = entry.Value;
+                if (value == 0 ||
+                    !_tlsKeys.TryGetValue(entry.Key, out var keyState) ||
+                    keyState.Destructor == 0)
+                {
+                    continue;
+                }
+
+                // Clear before invoking, per POSIX, so a destructor that
+                // re-sets the key is handled on the next iteration.
+                if (!values.TryUpdate(entry.Key, 0, value))
+                {
+                    continue;
+                }
+
+                ranAny = true;
+                _ = scheduler.TryCallGuestFunction(
+                    ctx,
+                    keyState.Destructor,
+                    value,
+                    0,
+                    0,
+                    0,
+                    "pthread_tls_destructor",
+                    out _);
+            }
+
+            if (!ranAny)
+            {
+                break;
+            }
+        }
+
+        _threadLocalSpecific.TryRemove(threadHandle, out _);
+    }
+
     private static int PthreadRwlockLockCore(CpuContext ctx, ulong rwlockAddress, bool write)
     {
         if (rwlockAddress == 0)
@@ -1680,4 +1799,24 @@ public static class KernelPthreadExtendedCompatExports
         payload[^1] = 0;
         return ctx.Memory.TryWrite(address, payload);
     }
+
+    private static bool TryReadInt32(CpuContext ctx, ulong address, out int value)
+    {
+        Span<byte> bytes = stackalloc byte[sizeof(int)];
+        if (!ctx.Memory.TryRead(address, bytes))
+        {
+            value = 0;
+            return false;
+        }
+
+        value = BinaryPrimitives.ReadInt32LittleEndian(bytes);
+        return true;
+    }
+
+    private static bool TryWriteInt32(CpuContext ctx, ulong address, int value)
+    {
+        Span<byte> bytes = stackalloc byte[sizeof(int)];
+        BinaryPrimitives.WriteInt32LittleEndian(bytes, value);
+        return ctx.Memory.TryWrite(address, bytes);
+    }
 }

src/SharpEmu.Libs/Kernel/KernelSemaphoreCompatExports.cs

@@ -1,8 +1,9 @@
 // Copyright (C) 2026 SharpEmu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+using System.Buffers.Binary;
 using System.Collections.Concurrent;
-using System.Diagnostics;
+using System.Text;
 using SharpEmu.HLE;
 
 namespace SharpEmu.Libs.Kernel;
@@ -13,9 +14,6 @@ public static class KernelSemaphoreCompatExports
     private static readonly ConcurrentDictionary<uint, KernelSemaphoreState> _semaphores = new();
     private static int _nextSemaphoreHandle = 1;
 
-    [ThreadStatic]
-    private static int _semaPollBackoffCount;
-
     private sealed class KernelSemaphoreState
     {
         public required string Name { get; init; }
@@ -25,35 +23,9 @@ public static class KernelSemaphoreCompatExports
         public required int MaxCount { get; init; }
         public int Count { get; set; }
         public int WaitingThreads { get; set; }
-        public int CancelEpoch { get; set; }
-        public bool Deleted { get; set; }
         public object Gate { get; } = new();
     }
 
-    private sealed class SemaphoreWaiter : IGuestThreadBlockWaiter
-    {
-        public required KernelSemaphoreState Semaphore { get; init; }
-        public required int NeedCount { get; init; }
-        public required int CancelEpochAtBlock { get; init; }
-        public bool Timed { get; init; }
-
-        // Timed-wait completion state; unused when Timed is false.
-        public CpuContext? Ctx { get; init; }
-        public ulong TimeoutAddress { get; init; }
-        public long DeadlineTimestamp { get; init; }
-
-        // Written and read only under the owning semaphore's Gate.
-        public int? Result { get; set; }
-
-        public int Resume() => Timed
-            ? CompleteBlockedTimedSemaWait(Ctx!, Semaphore, this, TimeoutAddress, DeadlineTimestamp)
-            : CompleteBlockedSemaWait(Semaphore, this);
-
-        public bool TryWake() => TryConsumeBlockedSemaWait(Semaphore, this);
-    }
-
-    private static string GetSemaphoreWakeKey(uint handle) => $"kernel_sema:0x{handle:X8}";
-
     [SysAbiExport(
         Nid = "188x57JYp0g",
         ExportName = "sceKernelCreateSema",
@@ -76,12 +48,12 @@ public static class KernelSemaphoreCompatExports
             initialCount > maxCount ||
             optionAddress != 0)
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
-        if (!ctx.TryReadNullTerminatedUtf8(nameAddress, MaxSemaphoreNameLength, out var name))
+        if (!TryReadNullTerminatedUtf8(ctx, nameAddress, MaxSemaphoreNameLength, out var name))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
         }
 
         var handle = unchecked((uint)Interlocked.Increment(ref _nextSemaphoreHandle));
@@ -90,7 +62,7 @@ public static class KernelSemaphoreCompatExports
             handle = unchecked((uint)Interlocked.Increment(ref _nextSemaphoreHandle));
         }
 
-        var state = new KernelSemaphoreState
+        _semaphores[handle] = new KernelSemaphoreState
         {
             Name = name,
             WakeKey = GetSemaphoreWakeKey(handle),
@@ -98,28 +70,18 @@ public static class KernelSemaphoreCompatExports
             MaxCount = maxCount,
             Count = initialCount,
         };
-        _semaphores[handle] = state;
 
-        if (!ctx.TryWriteUInt32(semaphoreAddress, handle))
+        if (!TryWriteUInt32(ctx, semaphoreAddress, handle))
         {
             _semaphores.TryRemove(handle, out _);
-            // Handles are sequential and guest-predictable, so a hostile guest can
-            // race a WaitSema onto the handle between publication above and this
-            // rollback. Strand-proof that waiter exactly like DeleteSema does.
-            lock (state.Gate)
-            {
-                state.Deleted = true;
-            }
-
-            _ = GuestThreadExecution.Scheduler?.WakeBlockedThreads(state.WakeKey);
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
         }
 
         if (_traceSema)
         {
             TraceSemaphore($"create handle=0x{handle:X8} name='{name}' attr=0x{attr:X} init={initialCount} max={maxCount}");
         }
-        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
     }
 
     [SysAbiExport(
@@ -135,125 +97,162 @@ public static class KernelSemaphoreCompatExports
 
         if (!_semaphores.TryGetValue(handle, out var semaphore))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
         }
 
         if (needCount < 1 || needCount > semaphore.MaxCount)
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        uint timeoutUsec = 0;
+        if (timeoutAddress != 0 && !TryReadUInt32(ctx, timeoutAddress, out timeoutUsec))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
         }
 
-        var pollTimedOut = false;
         lock (semaphore.Gate)
         {
             if (semaphore.Count >= needCount)
             {
                 semaphore.Count -= needCount;
+                if (timeoutAddress != 0)
+                {
+                    _ = TryWriteUInt32(ctx, timeoutAddress, timeoutUsec);
+                }
+
                 if (_traceSema)
                 {
-                    TraceSemaphore($"wait handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count}");
+                    TraceSemaphore($"wait handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count} timeout={(timeoutAddress == 0 ? "infinite" : timeoutUsec)}");
                 }
-                return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+                return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
             }
 
+            semaphore.WaitingThreads++;
+        }
+
+        // Block cooperatively: the wake predicate atomically acquires the
+        // tokens (so a wake commits the acquisition), while the resume
+        // handler distinguishes a real acquisition from a deadline expiry.
+        var acquired = false;
+        var deadline = timeoutAddress != 0
+            ? GuestThreadExecution.ComputeDeadlineTimestamp(TimeSpan.FromMicroseconds(timeoutUsec))
+            : 0;
+
+        bool WakePredicate()
+        {
+            lock (semaphore.Gate)
+            {
+                if (semaphore.Count >= needCount)
+                {
+                    semaphore.Count -= needCount;
+                    semaphore.WaitingThreads = Math.Max(0, semaphore.WaitingThreads - 1);
+                    acquired = true;
+                    return true;
+                }
+
+                return false;
+            }
+        }
+
+        int ResumeWait()
+        {
             if (timeoutAddress != 0)
             {
-                if (!ctx.TryReadUInt32(timeoutAddress, out var timeoutMicros))
-                {
-                    return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
-                }
-
-                if (timeoutMicros == 0)
-                {
-                    _ = ctx.TryWriteUInt32(timeoutAddress, 0);
-                    if (_traceSema)
-                    {
-                        TraceSemaphore($"wait-timeout handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count}");
-                    }
-                    pollTimedOut = true;
-                }
-                else
-                {
-                    var deadline = GuestThreadExecution.ComputeDeadlineTimestamp(TimeSpan.FromTicks((long)timeoutMicros * 10L));
-                    var timedWaiter = new SemaphoreWaiter
-                    {
-                        Semaphore = semaphore,
-                        NeedCount = needCount,
-                        CancelEpochAtBlock = semaphore.CancelEpoch,
-                        Timed = true,
-                        Ctx = ctx,
-                        TimeoutAddress = timeoutAddress,
-                        DeadlineTimestamp = deadline,
-                    };
-                    if (GuestThreadExecution.RequestCurrentThreadBlock(
-                            ctx,
-                            "sceKernelWaitSema",
-                            semaphore.WakeKey,
-                            timedWaiter,
-                            blockDeadlineTimestamp: deadline))
-                    {
-                        semaphore.WaitingThreads++;
-                        if (_traceSema)
-                        {
-                            TraceSemaphore($"wait-block-timed handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count} timeout_us={timeoutMicros} waiters={semaphore.WaitingThreads}");
-                        }
-                        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
-                    }
-
-                    // Host-owned threads cannot park in the guest scheduler; degrade to the
-                    // immediate-timeout poll the callers already tolerate.
-                    _ = ctx.TryWriteUInt32(timeoutAddress, 0);
-                    if (_traceSema)
-                    {
-                        TraceSemaphore($"wait-timeout handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count}");
-                    }
-                    pollTimedOut = true;
-                }
+                _ = TryWriteUInt32(ctx, timeoutAddress, 0);
             }
 
-            if (!pollTimedOut)
+            if (acquired)
             {
-                var waiter = new SemaphoreWaiter
-                {
-                    Semaphore = semaphore,
-                    NeedCount = needCount,
-                    CancelEpochAtBlock = semaphore.CancelEpoch,
-                };
-                if (!GuestThreadExecution.RequestCurrentThreadBlock(
-                        ctx,
-                        "sceKernelWaitSema",
-                        semaphore.WakeKey,
-                        waiter))
-                {
-                    if (_traceSema)
-                    {
-                        TraceSemaphore($"wait-would-block handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count}");
-                    }
-                    return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_TRY_AGAIN);
-                }
-
-                semaphore.WaitingThreads++;
                 if (_traceSema)
                 {
-                    TraceSemaphore($"wait-block handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count} waiters={semaphore.WaitingThreads}");
+                    TraceSemaphore($"wait-wake handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count}");
                 }
-                return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+                return (int)OrbisGen2Result.ORBIS_GEN2_OK;
             }
+
+            lock (semaphore.Gate)
+            {
+                semaphore.WaitingThreads = Math.Max(0, semaphore.WaitingThreads - 1);
+            }
+
+            if (_traceSema)
+            {
+                TraceSemaphore($"wait-timeout handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count}");
+            }
+            return (int)OrbisGen2Result.ORBIS_GEN2_ERROR_TIMED_OUT;
         }
 
-        GuestThreadExecution.Scheduler?.Pump(ctx, "sceKernelWaitSema");
-        if ((++_semaPollBackoffCount & 255) == 0)
+        if (GuestThreadExecution.RequestCurrentThreadBlock(
+                ctx,
+                "sceKernelWaitSema",
+                GetSemaphoreWakeKey(handle),
+                ResumeWait,
+                WakePredicate,
+                deadline))
         {
-            Thread.Sleep(0);
-        }
-        else
-        {
-            Thread.Yield();
+            if (_traceSema)
+            {
+                TraceSemaphore($"wait-block handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count} timeout={(timeoutAddress == 0 ? "infinite" : timeoutUsec)} waiters={semaphore.WaitingThreads} {FormatCallSite(ctx)}");
+            }
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
         }
 
-        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_TIMED_OUT);
+        // Not a guest thread (or no scheduler): fall back to a host-thread
+        // wait so the semantics still hold on non-cooperative callers.
+        return WaitSemaphoreOnHostThread(ctx, semaphore, handle, needCount, timeoutAddress, timeoutUsec);
     }
 
+    private static int WaitSemaphoreOnHostThread(
+        CpuContext ctx,
+        KernelSemaphoreState semaphore,
+        uint handle,
+        int needCount,
+        ulong timeoutAddress,
+        uint timeoutUsec)
+    {
+        var deadlineMs = timeoutAddress != 0
+            ? Environment.TickCount64 + Math.Max(1L, timeoutUsec / 1000L)
+            : long.MaxValue;
+        lock (semaphore.Gate)
+        {
+            if (_traceSema)
+            {
+                TraceSemaphore(
+                    $"wait-host-block handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} " +
+                    $"count={semaphore.Count} timeout={(timeoutAddress == 0 ? "infinite" : timeoutUsec)} {FormatCallSite(ctx)}");
+            }
+            while (semaphore.Count < needCount)
+            {
+                var remaining = deadlineMs - Environment.TickCount64;
+                if (timeoutAddress != 0 && remaining <= 0)
+                {
+                    semaphore.WaitingThreads = Math.Max(0, semaphore.WaitingThreads - 1);
+                    _ = TryWriteUInt32(ctx, timeoutAddress, 0);
+                    return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_TIMED_OUT);
+                }
+
+                Monitor.Wait(semaphore.Gate, (int)Math.Min(remaining, 100));
+            }
+
+            semaphore.Count -= needCount;
+            semaphore.WaitingThreads = Math.Max(0, semaphore.WaitingThreads - 1);
+            if (_traceSema)
+            {
+                TraceSemaphore(
+                    $"wait-host-wake handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count} {FormatCallSite(ctx)}");
+            }
+            if (timeoutAddress != 0)
+            {
+                _ = TryWriteUInt32(ctx, timeoutAddress, 0);
+            }
+
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
+        }
+    }
+
+    private static string GetSemaphoreWakeKey(uint handle) => $"sceKernelWaitSema:{handle:X8}";
+
     [SysAbiExport(
         Nid = "12wOHk8ywb0",
         ExportName = "sceKernelPollSema",
@@ -263,12 +262,12 @@ public static class KernelSemaphoreCompatExports
     {
         if (!_semaphores.TryGetValue(handle, out var semaphore))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
         }
 
         if (needCount < 1 || needCount > semaphore.MaxCount)
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         lock (semaphore.Gate)
@@ -279,7 +278,7 @@ public static class KernelSemaphoreCompatExports
                 {
                     TraceSemaphore($"poll-busy handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count}");
                 }
-                return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_BUSY);
+                return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_BUSY);
             }
 
             semaphore.Count -= needCount;
@@ -287,7 +286,7 @@ public static class KernelSemaphoreCompatExports
             {
                 TraceSemaphore($"poll handle=0x{handle:X8} name='{semaphore.Name}' need={needCount} count={semaphore.Count}");
             }
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
         }
     }
 
@@ -300,34 +299,34 @@ public static class KernelSemaphoreCompatExports
     {
         if (!_semaphores.TryGetValue(handle, out var semaphore))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
         }
 
         if (signalCount <= 0)
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         lock (semaphore.Gate)
         {
             if (semaphore.Count > semaphore.MaxCount - signalCount)
             {
-                return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+                return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
             }
 
             semaphore.Count += signalCount;
+            // Wake host-thread waiters parked in the fallback path.
+            Monitor.PulseAll(semaphore.Gate);
             if (_traceSema)
             {
-                TraceSemaphore($"signal handle=0x{handle:X8} name='{semaphore.Name}' signal={signalCount} count={semaphore.Count} waiters={semaphore.WaitingThreads}");
+                TraceSemaphore($"signal handle=0x{handle:X8} name='{semaphore.Name}' signal={signalCount} count={semaphore.Count} waiters={semaphore.WaitingThreads} {FormatCallSite(ctx)}");
             }
         }
 
-        // Wake after releasing the gate (lock order: scheduler gate -> semaphore gate).
-        // Wake everyone; the wake handler consumes the count per waiter, so a waiter
-        // whose needCount exceeds the remaining count stays parked while a smaller
-        // waiter can proceed.
-        _ = GuestThreadExecution.Scheduler?.WakeBlockedThreads(semaphore.WakeKey);
-        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+        // Wake cooperatively-blocked guest threads; their wake predicate
+        // acquires the tokens atomically, so this respects the new count.
+        _ = GuestThreadExecution.Scheduler?.WakeBlockedThreads(GetSemaphoreWakeKey(handle));
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
     }
 
     [SysAbiExport(
@@ -339,35 +338,32 @@ public static class KernelSemaphoreCompatExports
     {
         if (!_semaphores.TryGetValue(handle, out var semaphore))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
         }
 
         if (setCount > semaphore.MaxCount)
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
         lock (semaphore.Gate)
         {
-            if (waitingThreadsAddress != 0 && !ctx.TryWriteUInt32(waitingThreadsAddress, unchecked((uint)semaphore.WaitingThreads)))
+            if (waitingThreadsAddress != 0 && !TryWriteUInt32(ctx, waitingThreadsAddress, unchecked((uint)semaphore.WaitingThreads)))
             {
-                return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+                return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
             }
 
             semaphore.Count = setCount < 0 ? semaphore.InitialCount : setCount;
-            semaphore.CancelEpoch++;
-            // WaitingThreads is NOT zeroed here: each canceled waiter decrements it
-            // exactly once in its wake handler. Zeroing here as well would double-count
-            // and silently absorb the increment of a waiter that parks between this
-            // gate release and the wake-all below.
+            semaphore.WaitingThreads = 0;
+            Monitor.PulseAll(semaphore.Gate);
             if (_traceSema)
             {
                 TraceSemaphore($"cancel handle=0x{handle:X8} name='{semaphore.Name}' set={setCount} count={semaphore.Count}");
             }
         }
 
-        _ = GuestThreadExecution.Scheduler?.WakeBlockedThreads(semaphore.WakeKey);
-        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+        _ = GuestThreadExecution.Scheduler?.WakeBlockedThreads(GetSemaphoreWakeKey(handle));
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
     }
 
     [SysAbiExport(
@@ -380,138 +376,244 @@ public static class KernelSemaphoreCompatExports
         var handle = unchecked((uint)ctx[CpuRegister.Rdi]);
         if (!_semaphores.TryRemove(handle, out var semaphore))
         {
-            return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_NOT_FOUND);
         }
 
-        // Delete succeeds even with blocked waiters; they wake with the deleted
-        // result (the SCE kernel wakes waiters with the EACCES-class code).
-        lock (semaphore.Gate)
-        {
-            semaphore.Deleted = true;
-        }
-
-        _ = GuestThreadExecution.Scheduler?.WakeBlockedThreads(semaphore.WakeKey);
         if (_traceSema)
         {
             TraceSemaphore($"delete handle=0x{handle:X8} name='{semaphore.Name}'");
         }
-        return ctx.SetReturn(OrbisGen2Result.ORBIS_GEN2_OK);
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
     }
 
-    // Wake handler: runs under the scheduler's guest-thread gate (lock order:
-    // scheduler gate -> semaphore gate). Returns true iff the waiter has a final
-    // result and should be re-readied; false leaves it parked.
-    private static bool TryConsumeBlockedSemaWait(KernelSemaphoreState semaphore, SemaphoreWaiter waiter)
+    [SysAbiExport(
+        Nid = "pDuPEf3m4fI",
+        ExportName = "sem_init",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libKernel")]
+    public static int PosixSemInit(CpuContext ctx)
     {
+        var semaphoreAddress = ctx[CpuRegister.Rdi];
+        var initialCountValue = ctx[CpuRegister.Rdx];
+        if (semaphoreAddress == 0 || initialCountValue > int.MaxValue)
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        var handle = unchecked((uint)Interlocked.Increment(ref _nextSemaphoreHandle));
+        if (handle == 0)
+        {
+            handle = unchecked((uint)Interlocked.Increment(ref _nextSemaphoreHandle));
+        }
+
+        var initialCount = unchecked((int)initialCountValue);
+        _semaphores[handle] = new KernelSemaphoreState
+        {
+            Name = $"posix@0x{semaphoreAddress:X16}",
+            WakeKey = GetSemaphoreWakeKey(handle),
+            InitialCount = initialCount,
+            MaxCount = int.MaxValue,
+            Count = initialCount,
+        };
+        if (!TryWriteUInt32(ctx, semaphoreAddress, handle))
+        {
+            _semaphores.TryRemove(handle, out _);
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
+        }
+
+        if (_traceSema)
+        {
+            TraceSemaphore($"posix-init address=0x{semaphoreAddress:X16} handle=0x{handle:X8} count={initialCount}");
+        }
+        return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK);
+    }
+
+    [SysAbiExport(
+        Nid = "YCV5dGGBcCo",
+        ExportName = "sem_wait",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libKernel")]
+    public static int PosixSemWait(CpuContext ctx)
+    {
+        if (!TryGetPosixSemaphoreHandle(ctx, ctx[CpuRegister.Rdi], out var handle))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        ctx[CpuRegister.Rdi] = handle;
+        ctx[CpuRegister.Rsi] = 1;
+        ctx[CpuRegister.Rdx] = 0;
+        return KernelWaitSema(ctx);
+    }
+
+    [SysAbiExport(
+        Nid = "WBWzsRifCEA",
+        ExportName = "sem_trywait",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libKernel")]
+    public static int PosixSemTryWait(CpuContext ctx)
+    {
+        if (!TryGetPosixSemaphoreHandle(ctx, ctx[CpuRegister.Rdi], out var handle))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        ctx[CpuRegister.Rdi] = handle;
+        ctx[CpuRegister.Rsi] = 1;
+        return KernelPollSema(ctx, handle, 1);
+    }
+
+    [SysAbiExport(
+        Nid = "w5IHyvahg-o",
+        ExportName = "sem_timedwait",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libKernel")]
+    public static int PosixSemTimedWait(CpuContext ctx)
+    {
+        var timeoutAddress = ctx[CpuRegister.Rsi];
+        if (!TryGetPosixSemaphoreHandle(ctx, ctx[CpuRegister.Rdi], out var handle))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        ctx[CpuRegister.Rdi] = handle;
+        ctx[CpuRegister.Rsi] = 1;
+        ctx[CpuRegister.Rdx] = timeoutAddress;
+        return KernelWaitSema(ctx);
+    }
+
+    [SysAbiExport(
+        Nid = "IKP8typ0QUk",
+        ExportName = "sem_post",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libKernel")]
+    public static int PosixSemPost(CpuContext ctx)
+    {
+        if (!TryGetPosixSemaphoreHandle(ctx, ctx[CpuRegister.Rdi], out var handle))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        ctx[CpuRegister.Rdi] = handle;
+        ctx[CpuRegister.Rsi] = 1;
+        return KernelSignalSema(ctx, handle, 1);
+    }
+
+    [SysAbiExport(
+        Nid = "Bq+LRV-N6Hk",
+        ExportName = "sem_getvalue",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libKernel")]
+    public static int PosixSemGetValue(CpuContext ctx)
+    {
+        var semaphoreAddress = ctx[CpuRegister.Rdi];
+        var valueAddress = ctx[CpuRegister.Rsi];
+        if (valueAddress == 0 ||
+            !TryGetPosixSemaphoreHandle(ctx, semaphoreAddress, out var handle) ||
+            !_semaphores.TryGetValue(handle, out var semaphore))
+        {
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
+        }
+
+        int count;
         lock (semaphore.Gate)
         {
-            return TryConsumeBlockedSemaWaitLocked(semaphore, waiter);
+            count = semaphore.Count;
         }
+
+        return TryWriteUInt32(ctx, valueAddress, unchecked((uint)count))
+            ? SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_OK)
+            : SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_MEMORY_FAULT);
     }
 
-    private static bool TryConsumeBlockedSemaWaitLocked(KernelSemaphoreState semaphore, SemaphoreWaiter waiter)
+    [SysAbiExport(
+        Nid = "cDW233RAwWo",
+        ExportName = "sem_destroy",
+        Target = Generation.Gen4 | Generation.Gen5,
+        LibraryName = "libKernel")]
+    public static int PosixSemDestroy(CpuContext ctx)
     {
-        if (waiter.Result is not null)
+        var semaphoreAddress = ctx[CpuRegister.Rdi];
+        if (!TryGetPosixSemaphoreHandle(ctx, semaphoreAddress, out var handle))
         {
-            return true;
-        }
-
-        if (semaphore.Deleted)
-        {
-            waiter.Result = (int)OrbisGen2Result.ORBIS_GEN2_ERROR_DELETED;
-            semaphore.WaitingThreads = Math.Max(0, semaphore.WaitingThreads - 1);
-            if (_traceSema)
-            {
-                TraceSemaphore($"wake-deleted name='{semaphore.Name}' need={waiter.NeedCount}");
-            }
-            return true;
-        }
-
-        if (semaphore.CancelEpoch != waiter.CancelEpochAtBlock)
-        {
-            waiter.Result = (int)OrbisGen2Result.ORBIS_GEN2_ERROR_CANCELED;
-            semaphore.WaitingThreads = Math.Max(0, semaphore.WaitingThreads - 1);
-            if (_traceSema)
-            {
-                TraceSemaphore($"wake-canceled name='{semaphore.Name}' need={waiter.NeedCount}");
-            }
-            return true;
-        }
-
-        if (semaphore.Count >= waiter.NeedCount)
-        {
-            semaphore.Count -= waiter.NeedCount;
-            waiter.Result = (int)OrbisGen2Result.ORBIS_GEN2_OK;
-            semaphore.WaitingThreads = Math.Max(0, semaphore.WaitingThreads - 1);
-            if (_traceSema)
-            {
-                TraceSemaphore($"wake-consume name='{semaphore.Name}' need={waiter.NeedCount} count={semaphore.Count} waiters={semaphore.WaitingThreads}");
-            }
-            return true;
-        }
-
-        return false;
-    }
-
-    // Resume handler: runs on the woken guest thread outside the scheduler gate;
-    // its return value becomes the guest's RAX for the resumed sceKernelWaitSema.
-    private static int CompleteBlockedSemaWait(KernelSemaphoreState semaphore, SemaphoreWaiter waiter)
-    {
-        lock (semaphore.Gate)
-        {
-            if (waiter.Result is null && !TryConsumeBlockedSemaWaitLocked(semaphore, waiter))
-            {
-                // Nothing readies a parked semaphore waiter without the wake handler
-                // resolving it, so reaching here means the scheduler contract changed.
-                Console.Error.WriteLine(
-                    $"[LOADER][GAP] sema.resume-no-outcome name='{semaphore.Name}' need={waiter.NeedCount} count={semaphore.Count}");
-                waiter.Result = (int)OrbisGen2Result.ORBIS_GEN2_ERROR_TRY_AGAIN;
-                semaphore.WaitingThreads = Math.Max(0, semaphore.WaitingThreads - 1);
-            }
-
-            return waiter.Result!.Value;
-        }
-    }
-
-    private static int CompleteBlockedTimedSemaWait(
-        CpuContext ctx,
-        KernelSemaphoreState semaphore,
-        SemaphoreWaiter waiter,
-        ulong timeoutAddress,
-        long deadlineTimestamp)
-    {
-        int result;
-        lock (semaphore.Gate)
-        {
-            if (waiter.Result is null && !TryConsumeBlockedSemaWaitLocked(semaphore, waiter))
-            {
-                waiter.Result = (int)OrbisGen2Result.ORBIS_GEN2_ERROR_TIMED_OUT;
-                semaphore.WaitingThreads = Math.Max(0, semaphore.WaitingThreads - 1);
-                if (_traceSema)
-                {
-                    TraceSemaphore($"wake-timeout name='{semaphore.Name}' need={waiter.NeedCount} count={semaphore.Count} waiters={semaphore.WaitingThreads}");
-                }
-            }
-
-            result = waiter.Result!.Value;
+            return SetReturn(ctx, OrbisGen2Result.ORBIS_GEN2_ERROR_INVALID_ARGUMENT);
         }
 
+        ctx[CpuRegister.Rdi] = handle;
+        var result = KernelDeleteSema(ctx);
         if (result == (int)OrbisGen2Result.ORBIS_GEN2_OK)
         {
-            var remainingTicks = deadlineTimestamp - Stopwatch.GetTimestamp();
-            var remainingMicros = remainingTicks <= 0
-                ? 0u
-                : (uint)Math.Min(uint.MaxValue, remainingTicks / (double)Stopwatch.Frequency * 1_000_000d);
-            _ = ctx.TryWriteUInt32(timeoutAddress, remainingMicros);
-        }
-        else
-        {
-            _ = ctx.TryWriteUInt32(timeoutAddress, 0);
+            _ = TryWriteUInt32(ctx, semaphoreAddress, 0);
         }
 
         return result;
     }
 
+    private static bool TryGetPosixSemaphoreHandle(CpuContext ctx, ulong semaphoreAddress, out uint handle)
+    {
+        handle = 0;
+        return semaphoreAddress != 0 &&
+               TryReadUInt32(ctx, semaphoreAddress, out handle) &&
+               handle != 0;
+    }
+
+    private static int SetReturn(CpuContext ctx, OrbisGen2Result result)
+    {
+        var value = (int)result;
+        ctx[CpuRegister.Rax] = unchecked((ulong)value);
+        return value;
+    }
+
+    private static bool TryReadUInt32(CpuContext ctx, ulong address, out uint value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(uint)];
+        if (!ctx.Memory.TryRead(address, buffer))
+        {
+            value = 0;
+            return false;
+        }
+
+        value = BinaryPrimitives.ReadUInt32LittleEndian(buffer);
+        return true;
+    }
+
+    private static bool TryWriteUInt32(CpuContext ctx, ulong address, uint value)
+    {
+        Span<byte> buffer = stackalloc byte[sizeof(uint)];
+        BinaryPrimitives.WriteUInt32LittleEndian(buffer, value);
+        return ctx.Memory.TryWrite(address, buffer);
+    }
+
+    private static bool TryReadNullTerminatedUtf8(CpuContext ctx, ulong address, int maxLength, out string value)
+    {
+        value = string.Empty;
+        if (address == 0 || maxLength <= 0)
+        {
+            return false;
+        }
+
+        var bytes = new byte[Math.Min(maxLength, 4096)];
+        Span<byte> current = stackalloc byte[1];
+        for (var i = 0; i < bytes.Length; i++)
+        {
+            if (!ctx.Memory.TryRead(address + (ulong)i, current))
+            {
+                return false;
+            }
+
+            if (current[0] == 0)
+            {
+                value = Encoding.UTF8.GetString(bytes, 0, i);
+                return true;
+            }
+
+            bytes[i] = current[0];
+        }
+
+        value = Encoding.UTF8.GetString(bytes);
+        return true;
+    }
+
     // Call sites must check this before building the interpolated message; the trace
     // strings would otherwise be allocated on every semaphore op even with tracing off.
     private static readonly bool _traceSema =
@@ -519,6 +621,17 @@ public static class KernelSemaphoreCompatExports
 
     private static void TraceSemaphore(string message)
     {
+        if (!_traceSema)
+        {
+            return;
+        }
+
         Console.Error.WriteLine($"[LOADER][TRACE] sema.{message}");
     }
+
+    private static string FormatCallSite(CpuContext ctx)
+    {
+        _ = ctx.TryReadUInt64(ctx[CpuRegister.Rsp], out var returnAddress);
+        return $"guest=0x{GuestThreadExecution.CurrentGuestThreadHandle:X16} ret=0x{returnAddress:X16}";
+    }
 }