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Flush instruction cache after (un)hooking so the ARM64 emulator re-JITs

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MinHook flushes only the 5 patched bytes; under the x86-on-ARM64
emulator (xtajit) that can leave a stale JIT translation of the
modified prologue and trap with a non-continuable breakpoint. Flush the
whole prologue and the trampoline on install, and the restored prologue
on teardown, so the emulator re-translates them. No-op on native x86.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Marc
2026-06-10 18:03:36 +00:00
parent 13abd4e546
commit e762e1b716
2 changed files with 17 additions and 0 deletions
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source/dll_main.cpp
+4
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@@ -252,6 +252,10 @@ void InitInstance(HINSTANCE hModule)
if (GetProcAddress_fn) {
MH_CreateHook(GetProcAddress_fn, OnGetProcAddress, (void**)&GetProcAddress_ret);
MH_EnableHook(GetProcAddress_fn);
// Re-JIT the patched prologue + trampoline under the x86-on-ARM64 emulator (no-op native).
const HANDLE proc = GetCurrentProcess();
FlushInstructionCache(proc, (void*)GetProcAddress_fn, 64);
if (GetProcAddress_ret) FlushInstructionCache(proc, (void*)GetProcAddress_ret, 64);
}
}