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Introduce additional forms of IMUL.

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This commit is contained in:
Thomas Harte 2022-03-07 09:05:22 -05:00
parent 4479be4fd0
commit 1ea9d3faf8
2 changed files with 24 additions and 6 deletions
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20
InstructionSets/x86/Decoder.cpp
View File

@ -205,12 +205,21 @@ std::pair<int, typename Decoder<model>::InstructionT> Decoder<model>::decode(con
RequiresMin(i80286);
Immediate(PUSH, data_size_);
break;
// TODO: 0x69: IMUL GvEvIv
case 0x69:
RequiresMin(i80286);
MemRegReg(IMUL_3, Reg_MemReg, data_size_);
operand_size_ = data_size_;
break;
case 0x6a:
RequiresMin(i80286);
Immediate(PUSH, DataSize::Byte);
break;
// TODO: 0x6b: IMUL GvEvIv
case 0x6b:
RequiresMin(i80286);
MemRegReg(IMUL_3, Reg_MemReg, data_size_);
operand_size_ = DataSize::Byte;
sign_extend_ = true;
break;
case 0x6c: // INSB
RequiresMin(i80186);
Complete(INS, None, None, DataSize::Byte);
@ -473,7 +482,10 @@ std::pair<int, typename Decoder<model>::InstructionT> Decoder<model>::decode(con
// TODO: 0xab: BTS Ev, Gv
// TODO: 0xac: SHRD EvGvIb
// TODO: 0xad: SHRD EvGvCL
// TODO: 0xaf: IMUL Gv, Ev
case 0xaf:
RequiresMin(i80386);
MemRegReg(IMUL_2, Reg_MemReg, data_size_);
break;
case 0xb2: RequiresMin(i80386); MemRegReg(LSS, Reg_MemReg, data_size_); break;
// TODO: 0xb3: BTR Ev, Gv
@ -578,7 +590,7 @@ std::pair<int, typename Decoder<model>::InstructionT> Decoder<model>::decode(con
case 2: operation_ = Operation::NOT; break;
case 3: operation_ = Operation::NEG; break;
case 4: operation_ = Operation::MUL; break;
case 5: operation_ = Operation::IMUL; break;
case 5: operation_ = Operation::IMUL_1; break;
case 6: operation_ = Operation::DIV; break;
case 7: operation_ = Operation::IDIV; break;
}

10
InstructionSets/x86/Instruction.hpp
View File

@ -65,8 +65,8 @@ enum class Operation: uint8_t {
SUB,
/// Unsigned multiply; multiplies the source value by AX or AL, storing the result in DX:AX or AX.
MUL,
/// Signed multiply; multiplies the source value by AX or AL, storing the result in DX:AX or AX.
IMUL,
/// Single operand signed multiply; multiplies the source value by AX or AL, storing the result in DX:AX or AX.
IMUL_1,
/// Unsigned divide; divide the source value by AX or AL, storing the quotient in AL and the remainder in AH.
DIV,
/// Signed divide; divide the source value by AX or AL, storing the quotient in AL and the remainder in AH.
@ -265,6 +265,9 @@ enum class Operation: uint8_t {
/// Stores the task register.
STR,
/// Three-operand form of IMUL; multiply the immediate by the source and write to the destination.
IMUL_3,
/// Undocumented (but used); loads all registers, including internal ones.
LOADALL,
@ -316,6 +319,9 @@ enum class Operation: uint8_t {
/// Move with sign extension.
MOVSX,
/// Two-operand form of IMUL; multiply the source by the destination and write to the destination.
IMUL_2,
IRETD,
JECXZ,
LODSD,