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[a64] Fix overwriting of return-value registers

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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
2024-06-23 14:00:22 -07:00
parent ea7475eb6c
commit 8ef4697c08
1 changed files with 5 additions and 2 deletions
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a64_backend.cc
+5 -2
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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]));