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UserspaceEmulator: Implement the NEG instruction

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Per the Intel manuals, NEG is equivalent to subtracting a value from 0.
This commit is contained in:
Andreas Kling
2020-07-12 00:36:07 +02:00
parent aa13183615
commit df95e25eaa
1 changed files with 16 additions and 3 deletions
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19
DevTools/UserspaceEmulator/SoftCPU.cpp
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@@ -998,9 +998,22 @@ void SoftCPU::MOV_seg_RM32(const X86::Instruction&) { TODO(); }
void SoftCPU::MUL_RM16(const X86::Instruction&) { TODO(); }
void SoftCPU::MUL_RM32(const X86::Instruction&) { TODO(); }
void SoftCPU::MUL_RM8(const X86::Instruction&) { TODO(); }
void SoftCPU::NEG_RM16(const X86::Instruction&) { TODO(); }
void SoftCPU::NEG_RM32(const X86::Instruction&) { TODO(); }
void SoftCPU::NEG_RM8(const X86::Instruction&) { TODO(); }
void SoftCPU::NEG_RM16(const X86::Instruction& insn)
{
insn.modrm().write16(*this, insn, op_sub<u16>(*this, 0, insn.modrm().read16(*this, insn)));
}
void SoftCPU::NEG_RM32(const X86::Instruction& insn)
{
insn.modrm().write32(*this, insn, op_sub<u32>(*this, 0, insn.modrm().read32(*this, insn)));
}
void SoftCPU::NEG_RM8(const X86::Instruction& insn)
{
insn.modrm().write8(*this, insn, op_sub<u8>(*this, 0, insn.modrm().read8(*this, insn)));
}
void SoftCPU::NOP(const X86::Instruction&) { TODO(); }
void SoftCPU::NOT_RM16(const X86::Instruction&) { TODO(); }
void SoftCPU::NOT_RM32(const X86::Instruction&) { TODO(); }