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forward branch for double-clear condition in reserved store

This commit is contained in:
chss95cs@gmail.com 2023-04-15 16:22:37 -04:00
parent 7fb4b4cd41
commit e75e0425e0
1 changed files with 10 additions and 8 deletions
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18
src/xenia/cpu/backend/x64/x64_backend.cc
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@ -864,6 +864,7 @@ void* X64HelperEmitter::EmitGuestAndHostSynchronizeStackSizeLoadThunk(
code_offsets.tail = getSize();
return EmitCurrentForOffsets(code_offsets);
}
void* X64HelperEmitter::EmitTryAcquireReservationHelper() {
_code_offsets code_offsets = {};
code_offsets.prolog = getSize();
@ -884,7 +885,6 @@ void* X64HelperEmitter::EmitTryAcquireReservationHelper() {
lock();
bts(qword[rdx], rcx);
// DebugBreak();
// set flag on local backend context for thread to indicate our previous
// attempt to get the reservation succeeded
setnc(r9b); // success = bitmap did not have a set bit at the idx
@ -914,13 +914,13 @@ void* X64HelperEmitter::EmitReservedStoreHelper(bool bit64) {
code_offsets.prolog = getSize();
Xbyak::Label done;
Xbyak::Label reservation_isnt_for_our_addr;
Xbyak::Label somehow_double_cleared;
// carry must be set + zero flag must be set
btr(GetBackendFlagsPtr(), 1);
jnc(done);
// mov(edx, i.src1.reg().cvt32());
mov(rax, GetBackendCtxPtr(offsetof(X64BackendContext, reserve_helper_)));
shr(ecx, RESERVE_BLOCK_SHIFT);
@ -958,22 +958,24 @@ void* X64HelperEmitter::EmitReservedStoreHelper(bool bit64) {
lock();
btr(qword[rdx], rcx);
// Xbyak::Label check_fucky;
jc(done);
DebugBreak();
// L(check_fucky);
jnc(somehow_double_cleared);
L(done);
// i don't care that theres a dependency on the prev value of rax atm
// sadly theres no CF&ZF condition code
setz(al);
setc(ah);
cmp(ax, 0x0101);
ret();
// could be the same label, but otherwise we don't know where we came from
// when one gets triggered
L(reservation_isnt_for_our_addr);
DebugBreak();
L(somehow_double_cleared); // somehow, something else cleared our reserve??
DebugBreak();
code_offsets.prolog_stack_alloc = getSize();
code_offsets.body = getSize();
code_offsets.epilog = getSize();