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ARM64EC: Support cooperative suspend

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When a suspend request occurs on a running thread, Windows gives the JIT
~10s to pause and NtContinue with the x86 context. Resumption is then
done through BeginSimulation.
This commit is contained in:
Billy Laws committed 2024-08-09 14:34:17 +00:00
1 parent a469047e7a
commit ea4004ec9d
1 file changed
+10
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Source/Windows/ARM64EC/Module.cpp
+10
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@@ -577,6 +577,15 @@ bool ResetToConsistentStateImpl(EXCEPTION_RECORD* Exception, CONTEXT* GuestConte
return true;
}
// The JIT (in CompileBlock) emits code to check the suspend doorbell at the start of every block, and run the following instruction if it is set:
static constexpr uint32_t SuspendTrapMagic {0xD4395FC0}; // brk #0xCAFE
if (Exception->ExceptionCode == EXCEPTION_ILLEGAL_INSTRUCTION && *reinterpret_cast<uint32_t*>(NativeContext->Pc) == SuspendTrapMagic) {
*NativeContext = Exception::ReconstructPackedECContext(*NativeContext);
LogMan::Msg::DFmt("Suspending: RIP: {:X} SP: {:X}", NativeContext->Pc, NativeContext->Sp);
CPUArea.Area->InSimulation = 0;
*CPUArea.Area->SuspendDoorbell = 0;
return true;
}
if (IsEmulatorStackAddress(reinterpret_cast<uint64_t>(__builtin_frame_address(0)))) {
Exception::RethrowGuestException(*Exception, *NativeContext);
@@ -736,6 +745,7 @@ NTSTATUS ThreadInit() {
}
CPUArea.ThreadState() = Thread;
CPUArea.Area->SuspendDoorbell = reinterpret_cast<ULONG*>(&Thread->CurrentFrame->SuspendDoorbell);
return STATUS_SUCCESS;
}