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UserspaceEmulator: Simplify MOVSB/MOVSW/MOVSD instructions

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Use the new loop instruction helpers.
This commit is contained in:
Andreas Kling 2020-07-18 00:16:00 +02:00
parent f70f530722
commit 79290696cf
1 changed files with 15 additions and 48 deletions
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63
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -1440,64 +1440,31 @@ 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(); }
template<typename T>
ALWAYS_INLINE static void do_movs(SoftCPU& cpu, const X86::Instruction& insn)
{
auto src_segment = cpu.segment(insn.segment_prefix().value_or(X86::SegmentRegister::DS));
cpu.do_once_or_repeat<false>(insn, [&] {
auto src = cpu.read_memory<T>({ src_segment, cpu.source_index(insn.a32()) });
cpu.write_memory<T>({ cpu.es(), cpu.destination_index(insn.a32()) }, src);
cpu.step_source_index(insn.a32(), sizeof(T));
cpu.step_destination_index(insn.a32(), sizeof(T));
});
}
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));
});
}
do_movs<u8>(*this, insn);
}
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() ? -4 : 4));
set_si(si() + (df() ? -4 : 4));
});
} else {
do_once_or_repeat<false>(insn, [&] {
auto src = read_memory32({ src_segment, esi() });
write_memory32({ es(), edi() }, src);
set_edi(edi() + (df() ? -4 : 4));
set_esi(esi() + (df() ? -4 : 4));
});
}
do_movs<u32>(*this, insn);
}
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() ? -2 : 2));
set_si(si() + (df() ? -2 : 2));
});
} else {
do_once_or_repeat<false>(insn, [&] {
auto src = read_memory16({ src_segment, esi() });
write_memory16({ es(), edi() }, src);
set_edi(edi() + (df() ? -2 : 2));
set_esi(esi() + (df() ? -2 : 2));
});
}
do_movs<u16>(*this, insn);
}
void SoftCPU::MOVSX_reg16_RM8(const X86::Instruction& insn)
{