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UserspaceEmulator: Implement SHR_RM32_imm8

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This commit is contained in:
Andreas Kling 2020-07-11 23:00:26 +02:00
parent d79f15e219
commit 2ee451afed
1 changed files with 34 additions and 1 deletions
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35
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -371,6 +371,34 @@ static typename TypeDoubler<Destination>::type op_imul(SoftCPU& cpu, const Desti
return result;
}
template<typename T>
static T op_shr(SoftCPU& cpu, T data, u8 steps)
{
if (steps == 0)
return data;
u32 result = 0;
u32 new_flags = 0;
if constexpr (sizeof(T) == 4)
asm volatile("shrl %%cl, %%eax\n" ::"a"(data), "c"(steps));
else if constexpr (sizeof(T) == 2)
asm volatile("shrw %%cl, %%ax\n" ::"a"(data), "c"(steps));
else if constexpr (sizeof(T) == 1)
asm volatile("shrb %%cl, %%al\n" ::"a"(data), "c"(steps));
asm volatile(
"mov %%eax, %%ebx\n"
: "=b"(result));
asm volatile(
"pushf\n"
"pop %%eax"
: "=a"(new_flags));
cpu.set_flags_oszapc(new_flags);
return result;
}
template<bool update_dest, typename Op>
void SoftCPU::generic_AL_imm8(Op op, const X86::Instruction& insn)
{
@ -1136,7 +1164,12 @@ void SoftCPU::SHR_RM16_CL(const X86::Instruction&) { TODO(); }
void SoftCPU::SHR_RM16_imm8(const X86::Instruction&) { TODO(); }
void SoftCPU::SHR_RM32_1(const X86::Instruction&) { TODO(); }
void SoftCPU::SHR_RM32_CL(const X86::Instruction&) { TODO(); }
void SoftCPU::SHR_RM32_imm8(const X86::Instruction&) { TODO(); }
void SoftCPU::SHR_RM32_imm8(const X86::Instruction& insn)
{
insn.modrm().write32(*this, insn, op_shr<u32>(*this, insn.modrm().read32(*this, insn), insn.imm8()));
}
void SoftCPU::SHR_RM8_1(const X86::Instruction&) { TODO(); }
void SoftCPU::SHR_RM8_CL(const X86::Instruction&) { TODO(); }
void SoftCPU::SHR_RM8_imm8(const X86::Instruction&) { TODO(); }