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UserspaceEmulator: Implement the LODSB/LODSW/LODSD instructions

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Look how nice they look with the new loop instruction helpers. :^)
This commit is contained in:
Andreas Kling 2020-07-18 00:14:46 +02:00
parent c3441719ea
commit 41bbedc41d
1 changed files with 26 additions and 3 deletions
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29
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -1369,9 +1369,32 @@ void SoftCPU::LGS_reg32_mem32(const X86::Instruction&) { TODO(); }
void SoftCPU::LIDT(const X86::Instruction&) { TODO(); }
void SoftCPU::LLDT_RM16(const X86::Instruction&) { TODO(); }
void SoftCPU::LMSW_RM16(const X86::Instruction&) { TODO(); }
void SoftCPU::LODSB(const X86::Instruction&) { TODO(); }
void SoftCPU::LODSD(const X86::Instruction&) { TODO(); }
void SoftCPU::LODSW(const X86::Instruction&) { TODO(); }
template<typename T>
ALWAYS_INLINE static void do_lods(SoftCPU& cpu, const X86::Instruction& insn)
{
auto src_segment = cpu.segment(insn.segment_prefix().value_or(X86::SegmentRegister::DS));
cpu.do_once_or_repeat<true>(insn, [&] {
auto src = cpu.read_memory<T>({ src_segment, cpu.source_index(insn.a32()) });
cpu.gpr<T>(X86::RegisterAL) = src;
cpu.step_source_index(insn.a32(), sizeof(T));
});
}
void SoftCPU::LODSB(const X86::Instruction& insn)
{
do_lods<u8>(*this, insn);
}
void SoftCPU::LODSD(const X86::Instruction& insn)
{
do_lods<u32>(*this, insn);
}
void SoftCPU::LODSW(const X86::Instruction& insn)
{
do_lods<u16>(*this, insn);
}
void SoftCPU::LOOPNZ_imm8(const X86::Instruction& insn)
{