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UserspaceEmulator: Simplify the STOSB/STOSW/STOSD instructions

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This commit is contained in:
Andreas Kling 2020-07-18 00:16:33 +02:00
parent 79290696cf
commit 8959f9950a
1 changed files with 12 additions and 33 deletions
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45
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -2076,47 +2076,26 @@ void SoftCPU::STI(const X86::Instruction&) { TODO(); }
void SoftCPU::STOSB(const X86::Instruction& insn)
{
if (insn.has_address_size_override_prefix()) {
do_once_or_repeat<false>(insn, [&] {
write_memory8({ es(), di() }, al());
set_di(di() + (df() ? -1 : 1));
});
} else {
do_once_or_repeat<false>(insn, [&] {
write_memory8({ es(), edi() }, al());
set_edi(edi() + (df() ? -1 : 1));
});
}
do_once_or_repeat<false>(insn, [&] {
write_memory8({ es(), destination_index(insn.a32()) }, al());
step_destination_index(insn.a32(), 1);
});
}
void SoftCPU::STOSD(const X86::Instruction& insn)
{
if (insn.has_address_size_override_prefix()) {
do_once_or_repeat<false>(insn, [&] {
write_memory32({ es(), di() }, eax());
set_di(di() + (df() ? -4 : 4));
});
} else {
do_once_or_repeat<false>(insn, [&] {
write_memory32({ es(), edi() }, eax());
set_edi(edi() + (df() ? -4 : 4));
});
}
do_once_or_repeat<false>(insn, [&] {
write_memory32({ es(), destination_index(insn.a32()) }, eax());
step_destination_index(insn.a32(), 4);
});
}
void SoftCPU::STOSW(const X86::Instruction& insn)
{
if (insn.has_address_size_override_prefix()) {
do_once_or_repeat<false>(insn, [&] {
write_memory16({ es(), di() }, ax());
set_di(di() + (df() ? -2 : 2));
});
} else {
do_once_or_repeat<false>(insn, [&] {
write_memory16({ es(), edi() }, ax());
set_edi(edi() + (df() ? -2 : 2));
});
}
do_once_or_repeat<false>(insn, [&] {
write_memory16({ es(), destination_index(insn.a32()) }, ax());
step_destination_index(insn.a32(), 2);
});
}
void SoftCPU::STR_RM16(const X86::Instruction&) { TODO(); }