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WOW64: Update frame state ESP and EIP before unlocking context for syscall

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Fixes reported CPU context when queried while processing the syscall.
This commit is contained in:
Jacek Caban committed 2026-08-28 18:52:12 +02:00
1 parent fd180a16d3
commit aed71ed5e9
1 file changed
+6 -6
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Source/Windows/WOW64/Module.cpp
+6 -6
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@@ -449,26 +449,26 @@ public:
ULONG32 Args;
}* StackArgs = reinterpret_cast<StackLayout*>(ReturnRSP);
ReturnRSP += sizeof(StackLayout);
Frame->State.gregs[FEXCore::X86State::REG_RSP] = ReturnRSP + sizeof(StackLayout);
Frame->State.rip = ReturnRIP;
const auto TLS = GetTLS();
Context::UnlockJITContext(TLS);
ReturnRAX = static_cast<uint64_t>(WineUnixCall(StackArgs->Handle, StackArgs->ID, ULongToPtr(StackArgs->Args)));
Context::LockJITContext(TLS);
Frame->State.gregs[FEXCore::X86State::REG_RAX] = ReturnRAX;
} else if (Frame->State.rip == (uint64_t)BridgeInstrs::Syscall) {
const uint64_t EntryRAX = Frame->State.gregs[FEXCore::X86State::REG_RAX];
Frame->State.gregs[FEXCore::X86State::REG_RSP] = ReturnRSP;
Frame->State.rip = ReturnRIP;
const auto TLS = GetTLS();
Context::UnlockJITContext(TLS);
Wow64ProcessPendingCrossProcessItems();
ReturnRAX = static_cast<uint64_t>(Wow64SystemServiceEx(static_cast<UINT>(EntryRAX), reinterpret_cast<UINT*>(ReturnRSP + 4)));
Context::LockJITContext(TLS);
}
// If a new context has been set, use it directly and don't return to the syscall caller
if (Frame->State.rip == (uint64_t)BridgeInstrs::Syscall || Frame->State.rip == (uint64_t)BridgeInstrs::UnixCall) {
Frame->State.gregs[FEXCore::X86State::REG_RAX] = ReturnRAX;
Frame->State.gregs[FEXCore::X86State::REG_RSP] = ReturnRSP;
Frame->State.rip = ReturnRIP;
}
// NORETURNEDRESULT causes this result to be ignored since we restore all registers back from memory after a syscall anyway