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LibX86: Use names closer to the spec for the Modrm

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This gets rid of a lot of magic number shifts and ands.
This commit is contained in:
Hendiadyoin1 2021-07-08 17:46:13 +02:00 • committed by Andreas Kling
parent 68193c365f
commit efa42c4d45
3 changed files with 58 additions and 53 deletions
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30
Userland/Libraries/LibX86/Instruction.cpp
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@ -1037,7 +1037,7 @@ String MemoryOrRegisterReference::to_string_a16() const
String base;
bool hasDisplacement = false;
switch (m_rm & 7) {
switch (rm()) {
case 0:
base = "bx+si";
break;
@ -1060,16 +1060,16 @@ String MemoryOrRegisterReference::to_string_a16() const
base = "bx";
break;
case 6:
if ((m_rm & 0xc0) == 0)
if (mod() == 0)
base = String::formatted("{:#04x}", m_displacement16);
else
base = "bp";
break;
}
switch (m_rm & 0xc0) {
case 0x40:
case 0x80:
switch (mod()) {
case 0b01:
case 0b10:
hasDisplacement = true;
}
@ -1178,16 +1178,16 @@ String MemoryOrRegisterReference::to_string_a32() const
return register_name(static_cast<RegisterIndex32>(m_register_index));
bool has_displacement = false;
switch (m_rm & 0xc0) {
case 0x40:
case 0x80:
switch (mod()) {
case 0b01:
case 0b10:
has_displacement = true;
}
if (m_has_sib && (m_sib & 7) == 5)
has_displacement = true;
String base;
switch (m_rm & 7) {
switch (rm()) {
case 0:
base = "eax";
break;
@ -1207,13 +1207,13 @@ String MemoryOrRegisterReference::to_string_a32() const
base = "edi";
break;
case 5:
if ((m_rm & 0xc0) == 0)
if (mod() == 0)
base = String::formatted("{:#08x}", m_displacement32);
else
base = "ebp";
break;
case 4:
base = sib_to_string(m_rm, m_sib);
base = sib_to_string(m_rm_byte, m_sib);
break;
}
@ -1766,7 +1766,7 @@ void Instruction::to_string_internal(StringBuilder& builder, u32 origin, const S
break;
case OP_reg32_CR:
append_mnemonic_space();
builder.append(register_name(static_cast<RegisterIndex32>(rm() & 7)));
builder.append(register_name(static_cast<RegisterIndex32>(modrm().rm())));
append(", ");
append_creg();
break;
@ -1774,11 +1774,11 @@ void Instruction::to_string_internal(StringBuilder& builder, u32 origin, const S
append_mnemonic_space();
append_creg();
append(", ");
builder.append(register_name(static_cast<RegisterIndex32>(rm() & 7)));
builder.append(register_name(static_cast<RegisterIndex32>(modrm().rm())));
break;
case OP_reg32_DR:
append_mnemonic_space();
builder.append(register_name(static_cast<RegisterIndex32>(rm() & 7)));
builder.append(register_name(static_cast<RegisterIndex32>(modrm().rm())));
append(", ");
append_dreg();
break;
@ -1786,7 +1786,7 @@ void Instruction::to_string_internal(StringBuilder& builder, u32 origin, const S
append_mnemonic_space();
append_dreg();
append(", ");
builder.append(register_name(static_cast<RegisterIndex32>(rm() & 7)));
builder.append(register_name(static_cast<RegisterIndex32>(modrm().rm())));
break;
case OP_short_imm8:
append_mnemonic_space();