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UserspaceEmulator: Add partial support for the SHLD/SHRD instructions

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We don't support all the addressing modes yet, but it won't be very
hard to add the rest of them when needed.
This commit is contained in:
Andreas Kling 2020-07-15 18:33:13 +02:00
parent 2da44dba44
commit feebe3f42e
1 changed files with 68 additions and 2 deletions
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70
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -576,6 +576,64 @@ ALWAYS_INLINE static T op_shl(SoftCPU& cpu, T data, u8 steps)
return result;
}
template<typename T>
ALWAYS_INLINE static T op_shrd(SoftCPU& cpu, T data, T extra_bits, u8 steps)
{
if (steps == 0)
return data;
u32 result = 0;
u32 new_flags = 0;
if constexpr (sizeof(T) == 4) {
asm volatile("shrd %%cl, %%edx, %%eax\n"
: "=a"(result)
: "a"(data), "d"(extra_bits), "c"(steps));
} else if constexpr (sizeof(T) == 2) {
asm volatile("shrb %%cl, %%dx, %%ax\n"
: "=a"(result)
: "a"(data), "d"(extra_bits), "c"(steps));
}
asm volatile(
"pushf\n"
"pop %%ebx"
: "=b"(new_flags));
cpu.set_flags_oszapc(new_flags);
return result;
}
template<typename T>
ALWAYS_INLINE static T op_shld(SoftCPU& cpu, T data, T extra_bits, u8 steps)
{
if (steps == 0)
return data;
u32 result = 0;
u32 new_flags = 0;
if constexpr (sizeof(T) == 4) {
asm volatile("shld %%cl, %%edx, %%eax\n"
: "=a"(result)
: "a"(data), "d"(extra_bits), "c"(steps));
} else if constexpr (sizeof(T) == 2) {
asm volatile("shlb %%cl, %%dx, %%ax\n"
: "=a"(result)
: "a"(data), "d"(extra_bits), "c"(steps));
}
asm volatile(
"pushf\n"
"pop %%ebx"
: "=b"(new_flags));
cpu.set_flags_oszapc(new_flags);
return result;
}
template<bool update_dest, typename Op>
ALWAYS_INLINE void SoftCPU::generic_AL_imm8(Op op, const X86::Instruction& insn)
{
@ -1577,7 +1635,11 @@ void SoftCPU::SGDT(const X86::Instruction&) { TODO(); }
void SoftCPU::SHLD_RM16_reg16_CL(const X86::Instruction&) { TODO(); }
void SoftCPU::SHLD_RM16_reg16_imm8(const X86::Instruction&) { TODO(); }
void SoftCPU::SHLD_RM32_reg32_CL(const X86::Instruction&) { TODO(); }
void SoftCPU::SHLD_RM32_reg32_imm8(const X86::Instruction&) { TODO(); }
void SoftCPU::SHLD_RM32_reg32_imm8(const X86::Instruction& insn)
{
insn.modrm().write32(*this, insn, op_shld(*this, gpr32(insn.reg32()), insn.modrm().read32(*this, insn), insn.imm8()));
}
void SoftCPU::SHL_RM16_1(const X86::Instruction& insn)
{
@ -1636,7 +1698,11 @@ void SoftCPU::SHL_RM8_imm8(const X86::Instruction& insn)
void SoftCPU::SHRD_RM16_reg16_CL(const X86::Instruction&) { TODO(); }
void SoftCPU::SHRD_RM16_reg16_imm8(const X86::Instruction&) { TODO(); }
void SoftCPU::SHRD_RM32_reg32_CL(const X86::Instruction&) { TODO(); }
void SoftCPU::SHRD_RM32_reg32_imm8(const X86::Instruction&) { TODO(); }
void SoftCPU::SHRD_RM32_reg32_imm8(const X86::Instruction& insn)
{
insn.modrm().write32(*this, insn, op_shrd(*this, gpr32(insn.reg32()), insn.modrm().read32(*this, insn), insn.imm8()));
}
void SoftCPU::SHR_RM16_1(const X86::Instruction& insn)
{