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[core] Improve native execution and guest threading

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ParantezTech
2026-06-28 23:45:26 +03:00
parent a5172fd2c0
commit 0e922a73ee
6 changed files with 1744 additions and 138 deletions
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src/SharpEmu.Core/Memory/PhysicalVirtualMemory.cs
+58
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@@ -461,6 +461,16 @@ public sealed unsafe class PhysicalVirtualMemory : IVirtualMemory, IGuestMemoryA
return false;
}
if (CanReadWithoutProtectionChange((ulong)srcPtr, (ulong)destination.Length, region))
{
fixed (byte* destPtr = destination)
{
Buffer.MemoryCopy(srcPtr, destPtr, (nuint)destination.Length, (nuint)destination.Length);
}
return true;
}
if (!TryTemporarilyProtectForRead((ulong)srcPtr, (ulong)destination.Length, region, out var touchedPages))
{
return false;
@@ -504,6 +514,16 @@ public sealed unsafe class PhysicalVirtualMemory : IVirtualMemory, IGuestMemoryA
return false;
}
if (CanWriteWithoutProtectionChange((ulong)destPtr, (ulong)source.Length, region))
{
fixed (byte* srcPtr = source)
{
Buffer.MemoryCopy(srcPtr, destPtr, (nuint)source.Length, (nuint)source.Length);
}
return true;
}
if (!VirtualProtect(destPtr, (nuint)source.Length, PAGE_EXECUTE_READWRITE, out var oldProtect))
{
return false;
@@ -633,6 +653,44 @@ public sealed unsafe class PhysicalVirtualMemory : IVirtualMemory, IGuestMemoryA
return protection is PAGE_EXECUTE or PAGE_EXECUTE_READ or PAGE_EXECUTE_READWRITE or PAGE_EXECUTE_WRITECOPY;
}
private bool CanReadWithoutProtectionChange(ulong address, ulong size, MemoryRegion region) =>
CanAccessWithoutProtectionChange(address, size, region, write: false);
private bool CanWriteWithoutProtectionChange(ulong address, ulong size, MemoryRegion region) =>
CanAccessWithoutProtectionChange(address, size, region, write: true);
private bool CanAccessWithoutProtectionChange(ulong address, ulong size, MemoryRegion region, bool write)
{
var startPage = AlignDown(address, PageSize);
var endPage = AlignUp(address + size, PageSize);
for (var pageAddress = startPage; pageAddress < endPage; pageAddress += PageSize)
{
if (_pageProtections.TryGetValue(pageAddress, out var flags))
{
if (write ? (flags & ProgramHeaderFlags.Write) == 0 : (flags & ProgramHeaderFlags.Read) == 0)
{
return false;
}
}
else if (write ? !IsWritableProtection(region.Protection) : !IsReadableProtection(region.Protection))
{
return false;
}
}
return true;
}
private static bool IsReadableProtection(uint protection)
{
return protection is PAGE_READONLY or PAGE_READWRITE or PAGE_EXECUTE_READ or PAGE_EXECUTE_READWRITE;
}
private static bool IsWritableProtection(uint protection)
{
return protection is PAGE_READWRITE or PAGE_EXECUTE_READWRITE;
}
private static uint GetCommitProtection(MemoryRegion region)
{
return region.IsExecutable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;