diff options
Diffstat (limited to 'Userland/DevTools/UserspaceEmulator/SoftCPU.cpp')
| -rw-r--r-- | Userland/DevTools/UserspaceEmulator/SoftCPU.cpp | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/Userland/DevTools/UserspaceEmulator/SoftCPU.cpp b/Userland/DevTools/UserspaceEmulator/SoftCPU.cpp index f39c6e8d7f..0ee6bb338e 100644 --- a/Userland/DevTools/UserspaceEmulator/SoftCPU.cpp +++ b/Userland/DevTools/UserspaceEmulator/SoftCPU.cpp @@ -2153,8 +2153,24 @@ void SoftCPU::MOV_reg8_imm8(const X86::Instruction& insn) gpr8(insn.reg8()) = shadow_wrap_as_initialized(insn.imm8()); } -void SoftCPU::MOV_seg_RM16(const X86::Instruction&) { TODO_INSN(); } -void SoftCPU::MOV_seg_RM32(const X86::Instruction&) { TODO_INSN(); } +void SoftCPU::write_segment_register(X86::SegmentRegister segment_register, ValueWithShadow<u16> value) +{ + // FIXME: Validate the segment selector and raise exception if necessary. + // FIXME: Complain if uninitialized data is moved into a segment register. + m_segment[to_underlying(segment_register)] = value.value(); +} + +void SoftCPU::MOV_seg_RM16(X86::Instruction const& insn) +{ + write_segment_register(insn.segment_register(), insn.modrm().read16(*this, insn)); +} + +void SoftCPU::MOV_seg_RM32(X86::Instruction const& insn) +{ + // NOTE: This instruction performs a 32-bit read but only the bottom 16 bits are used since segment registers are 16-bit. + auto value = insn.modrm().read32(*this, insn); + write_segment_register(insn.segment_register(), ValueWithShadow<u16>(value.value(), value.shadow_as_value())); +} void SoftCPU::MUL_RM16(const X86::Instruction& insn) { |