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[a64] Fix overwriting of return-value registers 

These are stomping over X0 and Q0 which is returning input argument registers as return values.
Fixes some guest-to-host calls.
This commit is contained in:
Wunkolo 2024-05-04 11:22:37 -07:00
parent 6a0e6a9ca9
commit 3d345d71a7
1 changed files with 5 additions and 2 deletions
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7
src/xenia/cpu/backend/a64/a64_backend.cc
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@ -458,7 +458,9 @@ void A64ThunkEmitter::EmitSaveVolatileRegs() {
}
void A64ThunkEmitter::EmitLoadVolatileRegs() {
LDR(X0, XSP, offsetof(StackLayout::Thunk, r[0]));
// Preserve arguments passed to and returned from a subroutine
// LDR(X0, XSP, offsetof(StackLayout::Thunk, r[0]));
LDR(X1, XSP, offsetof(StackLayout::Thunk, r[1]));
LDR(X2, XSP, offsetof(StackLayout::Thunk, r[2]));
LDR(X3, XSP, offsetof(StackLayout::Thunk, r[3]));
@ -481,7 +483,8 @@ void A64ThunkEmitter::EmitLoadVolatileRegs() {
LDR(X30, XSP, offsetof(StackLayout::Thunk, r[19]));
LDR(Q0, XSP, offsetof(StackLayout::Thunk, xmm[0]));
// Preserve arguments passed to and returned from a subroutine
// LDR(Q0, XSP, offsetof(StackLayout::Thunk, xmm[0]));
LDR(Q1, XSP, offsetof(StackLayout::Thunk, xmm[1]));
LDR(Q2, XSP, offsetof(StackLayout::Thunk, xmm[2]));
LDR(Q3, XSP, offsetof(StackLayout::Thunk, xmm[3]));