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UserspaceEmulator: Add the LOOP/LOOPZ/LOOPNZ instructions

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This commit is contained in:
Andreas Kling 2020-07-17 19:49:59 +02:00
parent af7a1eca0b
commit 28b6ba56aa
1 changed files with 39 additions and 3 deletions
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42
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -1356,9 +1356,45 @@ 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(); }
void SoftCPU::LOOPNZ_imm8(const X86::Instruction&) { TODO(); }
void SoftCPU::LOOPZ_imm8(const X86::Instruction&) { TODO(); }
void SoftCPU::LOOP_imm8(const X86::Instruction&) { TODO(); }
void SoftCPU::LOOPNZ_imm8(const X86::Instruction& insn)
{
if (insn.a32()) {
set_ecx(ecx() - 1);
if (ecx() != 0 && !zf())
set_eip(eip() + (i8)insn.imm8());
} else {
set_cx(cx() - 1);
if (cx() != 0 && !zf())
set_eip(eip() + (i8)insn.imm8());
}
}
void SoftCPU::LOOPZ_imm8(const X86::Instruction& insn)
{
if (insn.a32()) {
set_ecx(ecx() - 1);
if (ecx() != 0 && zf())
set_eip(eip() + (i8)insn.imm8());
} else {
set_cx(cx() - 1);
if (cx() != 0 && zf())
set_eip(eip() + (i8)insn.imm8());
}
}
void SoftCPU::LOOP_imm8(const X86::Instruction& insn)
{
if (insn.a32()) {
set_ecx(ecx() - 1);
if (ecx() != 0)
set_eip(eip() + (i8)insn.imm8());
} else {
set_cx(cx() - 1);
if (cx() != 0)
set_eip(eip() + (i8)insn.imm8());
}
}
void SoftCPU::LSL_reg16_RM16(const X86::Instruction&) { TODO(); }
void SoftCPU::LSL_reg32_RM32(const X86::Instruction&) { TODO(); }
void SoftCPU::LSS_reg16_mem16(const X86::Instruction&) { TODO(); }