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1fix mwait2

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This commit is contained in:
lizzie 2026-04-23 02:55:38 +00:00
parent ffb713285c
commit fde658f7d4
1 changed files with 7 additions and 11 deletions
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18
src/dynarmic/src/dynarmic/common/spin_lock_x64.cpp
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@ -23,16 +23,14 @@ static const auto default_cg_mode = nullptr; //Allow RWE
namespace Dynarmic {
void EmitSpinLockLock(Xbyak::CodeGenerator& code, Xbyak::Reg64 ptr, Xbyak::Reg32 tmp, bool waitpkg) {
// TODO: this is because we lack regalloc - so better to be safe :(
if (waitpkg) {
code.push(Xbyak::util::rax);
code.push(Xbyak::util::rbx);
code.push(Xbyak::util::rdx);
}
Xbyak::Label start, loop;
code.jmp(start, code.T_NEAR);
code.L(loop);
if (waitpkg) {
// TODO: this is because we lack regalloc - so better to be safe :(
code.push(Xbyak::util::rax);
code.push(Xbyak::util::rbx);
code.push(Xbyak::util::rdx);
// TODO: This clobbers EAX and EDX did we tell the regalloc?
// ARM ptr for address-monitoring
code.umonitor(ptr);
@ -49,6 +47,9 @@ void EmitSpinLockLock(Xbyak::CodeGenerator& code, Xbyak::Reg64 ptr, Xbyak::Reg32
code.umwait(Xbyak::util::ebx);
// CF == 1 if we hit the OS-timeout in IA32_UMWAIT_CONTROL without a write
// CF == 0 if we exited the wait for any other reason
code.pop(Xbyak::util::rdx);
code.pop(Xbyak::util::rbx);
code.pop(Xbyak::util::rax);
} else {
code.pause();
}
@ -57,11 +58,6 @@ void EmitSpinLockLock(Xbyak::CodeGenerator& code, Xbyak::Reg64 ptr, Xbyak::Reg32
/*code.lock();*/ code.xchg(code.dword[ptr], tmp);
code.test(tmp, tmp);
code.jnz(loop, code.T_NEAR);
if (waitpkg) {
code.pop(Xbyak::util::rdx);
code.pop(Xbyak::util::rbx);
code.pop(Xbyak::util::rax);
}
}
void EmitSpinLockUnlock(Xbyak::CodeGenerator& code, Xbyak::Reg64 ptr, Xbyak::Reg32 tmp) {