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Added support for string instructions with REP prefix, specifically F3 A5 (REP MOVS)

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bird_egop
2025-04-13 02:10:48 +03:00
parent bfaeba0d5f
commit c14a92bf04
3 changed files with 125 additions and 4 deletions
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12
X86Disassembler/X86/OpcodeMap.cs
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@ -118,6 +118,16 @@ public static class OpcodeMap
OneByteOpcodes[0xA2] = "mov"; // MOV moffs8, AL
OneByteOpcodes[0xA3] = "mov"; // MOV moffs32, EAX
// String instructions
OneByteOpcodes[0xA4] = "movs"; // MOVS byte
OneByteOpcodes[0xA5] = "movs"; // MOVS dword
OneByteOpcodes[0xAA] = "stos"; // STOS byte
OneByteOpcodes[0xAB] = "stos"; // STOS dword
OneByteOpcodes[0xAC] = "lods"; // LODS byte
OneByteOpcodes[0xAD] = "lods"; // LODS dword
OneByteOpcodes[0xAE] = "scas"; // SCAS byte
OneByteOpcodes[0xAF] = "scas"; // SCAS dword
// Control flow instructions
OneByteOpcodes[0xCC] = "int3";
OneByteOpcodes[0x90] = "nop";
@ -178,6 +188,6 @@ public static class OpcodeMap
/// <returns>The mnemonic</returns>
public static string GetMnemonic(byte opcode)
{
return "TODO UNKNOWN: " + OneByteOpcodes[opcode];
return OneByteOpcodes[opcode];
}
}