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UserspaceEmulator: Implement the SCASB/SCASW/SCASD instructions

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This commit is contained in:
Andreas Kling 2020-07-18 00:15:36 +02:00
parent 41bbedc41d
commit f70f530722
1 changed files with 25 additions and 3 deletions
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28
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -2014,9 +2014,31 @@ static T op_sar(SoftCPU& cpu, T data, u8 steps)
DEFINE_GENERIC_SHIFT_ROTATE_INSN_HANDLERS(SAR, op_sar)
void SoftCPU::SCASB(const X86::Instruction&) { TODO(); }
void SoftCPU::SCASD(const X86::Instruction&) { TODO(); }
void SoftCPU::SCASW(const X86::Instruction&) { TODO(); }
template<typename T>
ALWAYS_INLINE static void do_scas(SoftCPU& cpu, const X86::Instruction& insn)
{
cpu.do_once_or_repeat<true>(insn, [&] {
auto src = cpu.gpr<T>(X86::RegisterAL);
auto dest = cpu.read_memory<T>({ cpu.es(), cpu.destination_index(insn.a32()) });
op_sub(cpu, dest, src);
cpu.step_destination_index(insn.a32(), sizeof(T));
});
}
void SoftCPU::SCASB(const X86::Instruction& insn)
{
do_scas<u8>(*this, insn);
}
void SoftCPU::SCASD(const X86::Instruction& insn)
{
do_scas<u32>(*this, insn);
}
void SoftCPU::SCASW(const X86::Instruction& insn)
{
do_scas<u16>(*this, insn);
}
void SoftCPU::SETcc_RM8(const X86::Instruction& insn)
{