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UserspaceEmulator: Implement MOVSB/MOVSW/MOVSD

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This commit is contained in:
Andreas Kling 2020-07-12 14:45:02 +02:00
parent ed57efff4f
commit 2d44f4526a
1 changed files with 60 additions and 3 deletions
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63
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -973,9 +973,66 @@ void SoftCPU::LSL_reg32_RM32(const X86::Instruction&) { TODO(); }
void SoftCPU::LSS_reg16_mem16(const X86::Instruction&) { TODO(); }
void SoftCPU::LSS_reg32_mem32(const X86::Instruction&) { TODO(); }
void SoftCPU::LTR_RM16(const X86::Instruction&) { TODO(); }
void SoftCPU::MOVSB(const X86::Instruction&) { TODO(); }
void SoftCPU::MOVSD(const X86::Instruction&) { TODO(); }
void SoftCPU::MOVSW(const X86::Instruction&) { TODO(); }
void SoftCPU::MOVSB(const X86::Instruction& insn)
{
auto src_segment = segment(insn.segment_prefix().value_or(X86::SegmentRegister::DS));
if (insn.has_address_size_override_prefix()) {
do_once_or_repeat<false>(insn, [&] {
auto src = read_memory8({ src_segment, si() });
write_memory8({ es(), di() }, src);
set_di(di() + (df() ? -1 : 1));
set_si(si() + (df() ? -1 : 1));
});
} else {
do_once_or_repeat<false>(insn, [&] {
auto src = read_memory8({ src_segment, esi() });
write_memory8({ es(), edi() }, src);
set_edi(edi() + (df() ? -1 : 1));
set_esi(esi() + (df() ? -1 : 1));
});
}
}
void SoftCPU::MOVSD(const X86::Instruction& insn)
{
auto src_segment = segment(insn.segment_prefix().value_or(X86::SegmentRegister::DS));
if (insn.has_address_size_override_prefix()) {
do_once_or_repeat<false>(insn, [&] {
auto src = read_memory32({ src_segment, si() });
write_memory32({ es(), di() }, src);
set_di(di() + (df() ? -1 : 1));
set_si(si() + (df() ? -1 : 1));
});
} else {
do_once_or_repeat<false>(insn, [&] {
auto src = read_memory32({ src_segment, esi() });
write_memory32({ es(), edi() }, src);
set_edi(edi() + (df() ? -1 : 1));
set_esi(esi() + (df() ? -1 : 1));
});
}
}
void SoftCPU::MOVSW(const X86::Instruction& insn)
{
auto src_segment = segment(insn.segment_prefix().value_or(X86::SegmentRegister::DS));
if (insn.has_address_size_override_prefix()) {
do_once_or_repeat<false>(insn, [&] {
auto src = read_memory16({ src_segment, si() });
write_memory16({ es(), di() }, src);
set_di(di() + (df() ? -1 : 1));
set_si(si() + (df() ? -1 : 1));
});
} else {
do_once_or_repeat<false>(insn, [&] {
auto src = read_memory16({ src_segment, esi() });
write_memory16({ es(), edi() }, src);
set_edi(edi() + (df() ? -1 : 1));
set_esi(esi() + (df() ? -1 : 1));
});
}
}
void SoftCPU::MOVSX_reg16_RM8(const X86::Instruction&) { TODO(); }
void SoftCPU::MOVSX_reg32_RM16(const X86::Instruction&) { TODO(); }
void SoftCPU::MOVSX_reg32_RM8(const X86::Instruction&) { TODO(); }