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| author | Andreas Kling <kling@serenityos.org> | 2020-07-12 00:36:07 +0200 |
|---|---|---|
| committer | Andreas Kling <kling@serenityos.org> | 2020-07-12 01:36:45 +0200 |
| commit | df95e25eaa618ae83d0ff0c3d6a2d6a22821f5ec (patch) | |
| tree | cf6dede2a348e1bd7164c4cfbf91fcda17926340 /DevTools | |
| parent | aa13183615449cf8d90c3073059f7ffb0ccace92 (diff) | |
| download | serenity-df95e25eaa618ae83d0ff0c3d6a2d6a22821f5ec.zip | |
UserspaceEmulator: Implement the NEG instruction
Per the Intel manuals, NEG is equivalent to subtracting a value from 0.
Diffstat (limited to 'DevTools')
| -rw-r--r-- | DevTools/UserspaceEmulator/SoftCPU.cpp | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/DevTools/UserspaceEmulator/SoftCPU.cpp b/DevTools/UserspaceEmulator/SoftCPU.cpp index 9508ec1f95..1547b26239 100644 --- a/DevTools/UserspaceEmulator/SoftCPU.cpp +++ b/DevTools/UserspaceEmulator/SoftCPU.cpp @@ -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(); } |