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UserspaceEmulator: Implement the CBW/CDQ/CWD/CWDE instructions

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This commit is contained in:
Andreas Kling 2020-07-15 01:31:57 +02:00
parent 036ce64cef
commit 400a252720
1 changed files with 23 additions and 4 deletions
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27
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -763,8 +763,18 @@ void SoftCPU::CALL_imm32(const X86::Instruction& insn)
set_eip(eip() + (i32)insn.imm32()); set_eip(eip() + (i32)insn.imm32());
} }
void SoftCPU::CBW(const X86::Instruction&) { TODO(); } void SoftCPU::CBW(const X86::Instruction&)
void SoftCPU::CDQ(const X86::Instruction&) { TODO(); } {
set_ah((al() & 0x80) ? 0xff : 0x00);
}
void SoftCPU::CDQ(const X86::Instruction&)
{
if (eax() & 0x80000000)
set_edx(0xffffffff);
else
set_edx(0x00000000);
}
void SoftCPU::CLC(const X86::Instruction&) void SoftCPU::CLC(const X86::Instruction&)
{ {
@ -833,8 +843,17 @@ void SoftCPU::CMPXCHG_RM8_reg8(const X86::Instruction& insn)
} }
void SoftCPU::CPUID(const X86::Instruction&) { TODO(); } void SoftCPU::CPUID(const X86::Instruction&) { TODO(); }
void SoftCPU::CWD(const X86::Instruction&) { TODO(); }
void SoftCPU::CWDE(const X86::Instruction&) { TODO(); } void SoftCPU::CWD(const X86::Instruction&)
{
set_dx((ax() & 0x8000) ? 0xffff : 0x0000);
}
void SoftCPU::CWDE(const X86::Instruction&)
{
set_eax(sign_extended_to<u32>(ax()));
}
void SoftCPU::DAA(const X86::Instruction&) { TODO(); } void SoftCPU::DAA(const X86::Instruction&) { TODO(); }
void SoftCPU::DAS(const X86::Instruction&) { TODO(); } void SoftCPU::DAS(const X86::Instruction&) { TODO(); }