[x64/Linux] Ensure EmitHostToGuestThunk saves rsi

2025-10-15 11:57:49 +09:00
parent 83ff0c501b
commit 2abf91603e
1 changed files with 5 additions and 1 deletions
--- a/src/xenia/cpu/backend/x64/x64_backend.cc
+++ b/src/xenia/cpu/backend/x64/x64_backend.cc
@@ -693,10 +693,14 @@ HostToGuestThunk X64HelperEmitter::EmitHostToGuestThunk() {
  EmitSaveNonvolatileRegs();

  mov(rax, rdi);
-  // mov(rsi, rsi);   // context
+  // Save context register (RSI is volatile on Linux/Mac System V ABI, but we
+  // need it preserved)
+  mov(qword[rsp + offsetof(StackLayout::Thunk, xmm[0])], rsi);
  mov(rdi, ptr[rsi + offsetof(ppc::PPCContext, virtual_membase)]);  // membase
  mov(rcx, rdx);  // return address
  call(rax);
+  // Restore context register
+  mov(rsi, qword[rsp + offsetof(StackLayout::Thunk, xmm[0])]);

  EmitLoadNonvolatileRegs();