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UserspaceEmulator: Implement IDIV_RM32

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This commit is contained in:
Andreas Kling 2020-07-15 01:37:16 +02:00
parent 400a252720
commit 0781868092
1 changed files with 19 additions and 1 deletions
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20
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -908,7 +908,25 @@ void SoftCPU::ENTER32(const X86::Instruction&) { TODO(); }
void SoftCPU::ESCAPE(const X86::Instruction&) { TODO(); }
void SoftCPU::HLT(const X86::Instruction&) { TODO(); }
void SoftCPU::IDIV_RM16(const X86::Instruction&) { TODO(); }
void SoftCPU::IDIV_RM32(const X86::Instruction&) { TODO(); }
void SoftCPU::IDIV_RM32(const X86::Instruction& insn)
{
auto divisor = insn.modrm().read32(*this, insn);
if (divisor == 0) {
warn() << "Divide by zero";
TODO();
}
i64 dividend = ((i64)edx() << 32) | eax();
auto result = dividend / divisor;
if (result > NumericLimits<i32>::max()) {
warn() << "Divide overflow";
TODO();
}
set_eax(result);
set_edx(dividend % divisor);
}
void SoftCPU::IDIV_RM8(const X86::Instruction&) { TODO(); }
void SoftCPU::IMUL_RM16(const X86::Instruction&) { TODO(); }
void SoftCPU::IMUL_RM32(const X86::Instruction&) { TODO(); }