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UserspaceEmulator: Implement the CMPXCHG instruction

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This commit is contained in:
Andreas Kling 2020-07-12 14:42:48 +02:00
parent 6ec0a63af1
commit ed57efff4f
1 changed files with 37 additions and 3 deletions
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40
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -735,9 +735,43 @@ void SoftCPU::CMOVcc_reg32_RM32(const X86::Instruction& insn)
void SoftCPU::CMPSB(const X86::Instruction&) { TODO(); }
void SoftCPU::CMPSD(const X86::Instruction&) { TODO(); }
void SoftCPU::CMPSW(const X86::Instruction&) { TODO(); }
void SoftCPU::CMPXCHG_RM16_reg16(const X86::Instruction&) { TODO(); }
void SoftCPU::CMPXCHG_RM32_reg32(const X86::Instruction&) { TODO(); }
void SoftCPU::CMPXCHG_RM8_reg8(const X86::Instruction&) { TODO(); }
void SoftCPU::CMPXCHG_RM16_reg16(const X86::Instruction& insn)
{
auto current = insn.modrm().read16(*this, insn);
if (current == eax()) {
set_zf(true);
insn.modrm().write16(*this, insn, gpr16(insn.reg16()));
} else {
set_zf(false);
set_eax(current);
}
}
void SoftCPU::CMPXCHG_RM32_reg32(const X86::Instruction& insn)
{
auto current = insn.modrm().read32(*this, insn);
if (current == eax()) {
set_zf(true);
insn.modrm().write32(*this, insn, gpr32(insn.reg32()));
} else {
set_zf(false);
set_eax(current);
}
}
void SoftCPU::CMPXCHG_RM8_reg8(const X86::Instruction& insn)
{
auto current = insn.modrm().read8(*this, insn);
if (current == eax()) {
set_zf(true);
insn.modrm().write8(*this, insn, gpr8(insn.reg8()));
} else {
set_zf(false);
set_eax(current);
}
}
void SoftCPU::CPUID(const X86::Instruction&) { TODO(); }
void SoftCPU::CWD(const X86::Instruction&) { TODO(); }
void SoftCPU::CWDE(const X86::Instruction&) { TODO(); }