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Preserve flags on some patched instructions

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This commit is contained in:
offtkp 2024-09-02 01:18:31 +03:00
parent 101aeb920d
commit fb7b72476b
1 changed files with 11 additions and 3 deletions
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14
src/core/cpu_patches.cpp
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@ -218,7 +218,7 @@ static void SaveContext(Xbyak::CodeGenerator& c) {
c.push(Xbyak::Reg64(reg)); c.push(Xbyak::Reg64(reg));
} }
for (int reg = 0; reg <= 7; reg++) { for (int reg = 0; reg <= 7; reg++) {
c.sub(rsp, 32); c.lea(rsp, ptr[rsp - 32]);
c.vmovdqu(ptr[rsp], Xbyak::Ymm(reg)); c.vmovdqu(ptr[rsp], Xbyak::Ymm(reg));
} }
} }
@ -230,13 +230,13 @@ static void RestoreContext(Xbyak::CodeGenerator& c, const Xbyak::Operand& dst) {
if ((!dst.isXMM() && !dst.isYMM()) || dst.getIdx() != reg) { if ((!dst.isXMM() && !dst.isYMM()) || dst.getIdx() != reg) {
c.vmovdqu(Xbyak::Ymm(reg), ptr[rsp]); c.vmovdqu(Xbyak::Ymm(reg), ptr[rsp]);
} }
c.add(rsp, 32); c.lea(rsp, ptr[rsp + 32]);
} }
for (int reg = Xbyak::Operand::R15; reg >= Xbyak::Operand::RAX; reg--) { for (int reg = Xbyak::Operand::R15; reg >= Xbyak::Operand::RAX; reg--) {
if (!dst.isREG() || dst.getIdx() != reg) { if (!dst.isREG() || dst.getIdx() != reg) {
c.pop(Xbyak::Reg64(reg)); c.pop(Xbyak::Reg64(reg));
} else { } else {
c.add(rsp, 8); c.lea(rsp, ptr[rsp + 8]);
} }
} }
RestoreStack(c); RestoreStack(c);
@ -363,6 +363,8 @@ static void GenerateVCVTPH2PS(const ZydisDecodedOperand* operands, Xbyak::CodeGe
SaveContext(c); SaveContext(c);
c.pushfq(); // VCVTPH2PS shouldn't modify flags
// Allocate stack space for outputs and load into first parameter. // Allocate stack space for outputs and load into first parameter.
c.sub(rsp, byte_count); c.sub(rsp, byte_count);
c.mov(rdi, rsp); c.mov(rdi, rsp);
@ -397,6 +399,8 @@ static void GenerateVCVTPH2PS(const ZydisDecodedOperand* operands, Xbyak::CodeGe
} }
c.add(rsp, byte_count); c.add(rsp, byte_count);
c.popfq();
RestoreContext(c, dst); RestoreContext(c, dst);
} }
@ -427,6 +431,8 @@ static void GenerateVCVTPS2PH(const ZydisDecodedOperand* operands, Xbyak::CodeGe
SaveContext(c); SaveContext(c);
c.pushfq(); // VCVTPS2PH shouldn't modify flags
if (dst->isXMM()) { if (dst->isXMM()) {
// Allocate stack space for outputs and load into first parameter. // Allocate stack space for outputs and load into first parameter.
c.sub(rsp, byte_count); c.sub(rsp, byte_count);
@ -472,6 +478,8 @@ static void GenerateVCVTPS2PH(const ZydisDecodedOperand* operands, Xbyak::CodeGe
c.add(rsp, byte_count); c.add(rsp, byte_count);
} }
c.popfq();
RestoreContext(c, *dst); RestoreContext(c, *dst);
} }