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

[a64] Refactor thunk prolog/epilog

This commit is contained in:
Wunkolo 2024-05-05 21:14:52 -07:00
parent 9ec4b68cae
commit c428d79e18
1 changed files with 32 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
src/xenia/cpu/backend/a64/a64_backend.cc
View File

@ -214,14 +214,18 @@ HostToGuestThunk A64ThunkEmitter::EmitHostToGuestThunk() {
code_offsets.prolog = offset();
// mov(qword[rsp + 8 * 3], r8);
// mov(qword[rsp + 8 * 2], rdx);
// mov(qword[rsp + 8 * 1], rcx);
// sub(rsp, stack_size);
STR(X2, XSP, 8 * 3);
STR(X1, XSP, 8 * 2);
STR(X0, XSP, 8 * 1);
SUB(XSP, XSP, stack_size);
// mov(qword[rsp + 8 * 3], r8);
// mov(qword[rsp + 8 * 2], rdx);
// 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);
STR(X0, SP, 8 * 1);
SUB(SP, SP, stack_size);
code_offsets.prolog_stack_alloc = offset();
code_offsets.body = offset();
@ -249,10 +253,14 @@ HostToGuestThunk A64ThunkEmitter::EmitHostToGuestThunk() {
// mov(r8, qword[rsp + 8 * 3]);
// ret();
ADD(XSP, XSP, stack_size);
LDR(X0, XSP, 8 * 1);
LDR(X1, XSP, 8 * 2);
LDR(X2, XSP, 8 * 3);
ADD(SP, SP, stack_size);
LDR(X0, SP, 8 * 1);
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();
@ -290,15 +298,18 @@ 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(XSP, XSP, stack_size);
SUB(SP, SP, stack_size);
code_offsets.prolog_stack_alloc = offset();
code_offsets.body = offset();
// Save off volatile registers.
EmitSaveVolatileRegs();
MOV(X29, SP);
// mov(rax, rcx); // function
// mov(rcx, GetContextReg()); // context
@ -307,13 +318,17 @@ GuestToHostThunk A64ThunkEmitter::EmitGuestToHostThunk() {
MOV(X0, GetContextReg()); // context
BLR(X16);
MOV(SP, X29);
EmitLoadVolatileRegs();
code_offsets.epilog = offset();
// add(rsp, stack_size);
// ret();
ADD(XSP, XSP, stack_size);
ADD(SP, SP, stack_size);
MOV(SP, X29);
LDP(X29, X30, SP, POST_INDEXED, 32);
RET();
code_offsets.tail = offset();
@ -383,7 +398,9 @@ ResolveFunctionThunk A64ThunkEmitter::EmitResolveFunctionThunk() {
// add(rsp, stack_size);
// jmp(rax);
ADD(XSP, XSP, stack_size);
ADD(SP, SP, stack_size);
MOV(SP, X29);
LDP(X29, X30, SP, POST_INDEXED, 32);
BR(X0);
code_offsets.tail = offset();