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core: implement sceKernelGetCompiledSdkVersion based on target generation (#66)

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Replaced the no-op stub for sceKernelGetCompiledSdkVersion with a proper runtime compliance implementation.

Runtime Validation: Added explicit NULL pointer verification for the destination buffer address (versionAddress == 0). It returns ORBIS_GEN2_ERROR_INVALID_ARGUMENT and sign-extends the target Rax register to 0xFFFFFFFF80020003, strictly mirroring the PthreadJoin error-handling pattern of this subsystem.
Target-Based SDK Fallback: Implemented deterministic fallback version routing based on ctx.TargetGeneration (0x05000000 for Gen4 and 0x09000000 for Gen5 standard Orbis layout). This ensures guest applications pass early firmware checks until native metadata extraction is implemented.
Atomic Memory Write: Secured the state write sequence via the native ctx.TryWriteUInt32 layer, correctly catching virtual memory page faults, propagating ORBIS_GEN2_ERROR_MEMORY_FAULT to Rax, and safely bypassing partial-write state corruption.
Out of scope (follow-up): Native parsing of the compiled SDK version flags directly out of the guest ELF note/metadata sections.
This commit is contained in:
Mike Saito
2026-07-11 22:18:26 +03:00
committed by GitHub
parent 8a40251a1c
commit 19added142
1 changed files with 20 additions and 1 deletions
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src/SharpEmu.Libs/Kernel/KernelExports.cs
+20 -1
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@@ -13,6 +13,8 @@ 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,
@@ -26,7 +28,24 @@ public static class KernelExports
LibraryName = "libKernel")]
public static int KernelGetCompiledSdkVersion(CpuContext ctx)
{
_ = 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;
return (int)OrbisGen2Result.ORBIS_GEN2_OK;
}