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Refuse late device-attach under ARM64 emulation

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Hot-patching an already-live device's vtable methods via SetDevice races
the emulator's self-modifying-code handling (Windows-on-ARM's xtajit, or
Wine on FEX-Emu/box64). Detect that case with IsWow64Process2 and refuse
the attach instead, so callers fall back to loading gMod as d3d9.dll
before the game creates its device.
This commit is contained in:
GWToolbox Bot
2026-07-07 08:37:05 +00:00
parent 9b809519f8
commit 98fe6fd9b9
3 changed files with 28 additions and 0 deletions
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source/dll_main.cpp
+8
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@@ -264,6 +264,14 @@ void InitInstance(HINSTANCE hModule)
extern "C" __declspec(dllexport) int __cdecl SetDevice(IDirect3DDevice9* device)
{
if (!device) return RETURN_BAD_ARGUMENT;
if (utils::IsRunningUnderArm64Emulation()) {
// The device is already live and being called every frame; hot-patching its vtable
// methods here would race the emulator's self-modifying-code handling. Load gMod as
// d3d9.dll before the game starts instead, so hooks install via Direct3DCreate9(Ex)
// on a device nobody has called into yet.
Warning("SetDevice: late device-attach isn't supported under ARM64 emulation\n");
return RETURN_UNSUPPORTED_UNDER_EMULATION;
}
try {
return RegisterExistingDevice(device) ? RETURN_OK : RETURN_EXISTS;
}