ShuriZma
/
xenia
mirror of https://github.com/xenia-project/xenia.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[a64] Remove standard prolog/epilog from thunks 

Fixes callstacks!!!!
This commit is contained in:
Wunkolo 2024-05-06 22:45:52 -07:00
parent 49f9edbfab
commit 906d0c6590
1 changed files with 0 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/xenia/cpu/backend/a64/a64_backend.cc
View File

@ -228,8 +228,6 @@ HostToGuestThunk A64ThunkEmitter::EmitHostToGuestThunk() {
// mov(qword[rsp + 8 * 1], rcx);
// sub(rsp, stack_size);
STP(X29, X30, SP, PRE_INDEXED, -32);
MOV(X29, SP);
STR(X2, SP, 8 * 3);
STR(X1, SP, 8 * 2);
@ -267,9 +265,6 @@ HostToGuestThunk A64ThunkEmitter::EmitHostToGuestThunk() {
LDR(X1, SP, 8 * 2);
LDR(X2, SP, 8 * 3);
MOV(SP, X29);
LDP(X29, X30, SP, POST_INDEXED, 32);
RET();
code_offsets.tail = offset();
@ -307,8 +302,6 @@ GuestToHostThunk A64ThunkEmitter::EmitGuestToHostThunk() {
code_offsets.prolog = offset();
STP(X29, X30, SP, PRE_INDEXED, -32);
MOV(X29, SP);
// rsp + 0 = return address
// sub(rsp, stack_size);
SUB(SP, SP, stack_size);
@ -318,7 +311,6 @@ GuestToHostThunk A64ThunkEmitter::EmitGuestToHostThunk() {
// Save off volatile registers.
EmitSaveVolatileRegs();
MOV(X29, SP);
// mov(rax, rcx); // function
// mov(rcx, GetContextReg()); // context
@ -327,8 +319,6 @@ GuestToHostThunk A64ThunkEmitter::EmitGuestToHostThunk() {
MOV(X0, GetContextReg()); // context
BLR(X16);
MOV(SP, X29);
EmitLoadVolatileRegs();
code_offsets.epilog = offset();
@ -336,8 +326,6 @@ GuestToHostThunk A64ThunkEmitter::EmitGuestToHostThunk() {
// add(rsp, stack_size);
// ret();
ADD(SP, SP, stack_size);
MOV(SP, X29);
LDP(X29, X30, SP, POST_INDEXED, 32);
RET();
code_offsets.tail = offset();
@ -382,8 +370,6 @@ ResolveFunctionThunk A64ThunkEmitter::EmitResolveFunctionThunk() {
// rsp + 0 = return address
// sub(rsp, stack_size);
STP(X29, X30, SP, POST_INDEXED, -32);
MOV(X29, SP);
SUB(SP, SP, stack_size);
code_offsets.prolog_stack_alloc = offset();
@ -408,8 +394,6 @@ ResolveFunctionThunk A64ThunkEmitter::EmitResolveFunctionThunk() {
// add(rsp, stack_size);
// jmp(rax);
ADD(SP, SP, stack_size);
MOV(SP, X29);
LDP(X29, X30, SP, POST_INDEXED, 32);
BR(X0);
code_offsets.tail = offset();
@ -429,8 +413,6 @@ ResolveFunctionThunk A64ThunkEmitter::EmitResolveFunctionThunk() {
return (ResolveFunctionThunk)fn;
}
// Caller saved:
// x0-x15, x30 | d0-d7 and d16-v31
void A64ThunkEmitter::EmitSaveVolatileRegs() {
// Save off volatile registers.
// Preserve arguments passed to and returned from a subroutine
@ -490,8 +472,6 @@ void A64ThunkEmitter::EmitLoadVolatileRegs() {
LDR(Q31, SP, offsetof(StackLayout::Thunk, xmm[21]));
}
// Callee saved:
// x19-x30 | d8-d15
void A64ThunkEmitter::EmitSaveNonvolatileRegs() {
STP(X19, X20, SP, offsetof(StackLayout::Thunk, r[0]));
STP(X21, X22, SP, offsetof(StackLayout::Thunk, r[2]));