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Code Issues Releases Activity

Updated instruction handlers to use Type and StructuredOperands instead of Mnemonic and Operands

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bird_egop
2025-04-14 22:08:50 +03:00
parent c516e063e7
commit 685eeda03d
136 changed files with 3694 additions and 2584 deletions
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70
X86Disassembler/X86/Handlers/String/StringInstructionHandler.cs
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@ -1,35 +1,59 @@
namespace X86Disassembler.X86.Handlers.String;
using X86Disassembler.X86.Operands;
/// <summary>
/// Handler for string instructions (MOVS, STOS, LODS, SCAS) with and without REP/REPNE prefixes
/// </summary>
public class StringInstructionHandler : InstructionHandler
{
// Dictionary mapping opcodes to their mnemonics and operands
private static readonly Dictionary<byte, (string Mnemonic, string Operands)> StringInstructions = new()
// Dictionary mapping opcodes to their instruction types and operand factories
private static readonly Dictionary<byte, (InstructionType Type, Func<Operand[]> CreateOperands)> StringInstructions = new()
{
{ 0xA4, ("movs", "byte ptr [edi], byte ptr [esi]") }, // MOVSB
{ 0xA5, ("movs", "dword ptr [edi], dword ptr [esi]") }, // MOVSD
{ 0xAA, ("stos", "byte ptr [edi], al") }, // STOSB
{ 0xAB, ("stos", "dword ptr [edi], eax") }, // STOSD
{ 0xAC, ("lods", "al, byte ptr [esi]") }, // LODSB
{ 0xAD, ("lods", "eax, dword ptr [esi]") }, // LODSD
{ 0xAE, ("scas", "al, byte ptr [edi]") }, // SCASB
{ 0xAF, ("scas", "eax, dword ptr [edi]") } // SCASD
{ 0xA4, (InstructionType.MovsB, () => new Operand[] {
OperandFactory.CreateDirectMemoryOperand(0, 8, "edi"),
OperandFactory.CreateDirectMemoryOperand(0, 8, "esi")
}) }, // MOVSB
{ 0xA5, (InstructionType.MovsD, () => new Operand[] {
OperandFactory.CreateDirectMemoryOperand(0, 32, "edi"),
OperandFactory.CreateDirectMemoryOperand(0, 32, "esi")
}) }, // MOVSD
{ 0xAA, (InstructionType.StosB, () => new Operand[] {
OperandFactory.CreateDirectMemoryOperand(0, 8, "edi"),
OperandFactory.CreateRegisterOperand(RegisterIndex.A, 8)
}) }, // STOSB
{ 0xAB, (InstructionType.StosD, () => new Operand[] {
OperandFactory.CreateDirectMemoryOperand(0, 32, "edi"),
OperandFactory.CreateRegisterOperand(RegisterIndex.A, 32)
}) }, // STOSD
{ 0xAC, (InstructionType.LodsB, () => new Operand[] {
OperandFactory.CreateRegisterOperand(RegisterIndex.A, 8),
OperandFactory.CreateDirectMemoryOperand(0, 8, "esi")
}) }, // LODSB
{ 0xAD, (InstructionType.LodsD, () => new Operand[] {
OperandFactory.CreateRegisterOperand(RegisterIndex.A, 32),
OperandFactory.CreateDirectMemoryOperand(0, 32, "esi")
}) }, // LODSD
{ 0xAE, (InstructionType.ScasB, () => new Operand[] {
OperandFactory.CreateRegisterOperand(RegisterIndex.A, 8),
OperandFactory.CreateDirectMemoryOperand(0, 8, "edi")
}) }, // SCASB
{ 0xAF, (InstructionType.ScasD, () => new Operand[] {
OperandFactory.CreateRegisterOperand(RegisterIndex.A, 32),
OperandFactory.CreateDirectMemoryOperand(0, 32, "edi")
}) } // SCASD
};
// REP/REPNE prefix opcodes
private const byte REP_PREFIX = 0xF3;
private const byte REPNE_PREFIX = 0xF2;
/// <summary>
/// Initializes a new instance of the StringInstructionHandler class
/// </summary>
/// <param name="codeBuffer">The buffer containing the code to decode</param>
/// <param name="decoder">The instruction decoder that owns this handler</param>
/// <param name="length">The length of the buffer</param>
public StringInstructionHandler(byte[] codeBuffer, InstructionDecoder decoder, int length)
: base(codeBuffer, decoder, length)
public StringInstructionHandler(InstructionDecoder decoder)
: base(decoder)
{
}
@ -57,7 +81,7 @@ public class StringInstructionHandler : InstructionHandler
return false;
}
byte nextByte = CodeBuffer[Decoder.GetPosition()];
byte nextByte = Decoder.PeakByte();
return StringInstructions.ContainsKey(nextByte);
}
@ -71,16 +95,12 @@ public class StringInstructionHandler : InstructionHandler
{
// Check if this is a REP/REPNE prefix
bool hasRepPrefix = opcode == REP_PREFIX || opcode == REPNE_PREFIX;
string prefixString = "";
// If this is a REP/REPNE prefix, get the actual string instruction opcode
byte stringOpcode = opcode;
if (hasRepPrefix)
{
// Set the prefix string based on the prefix opcode
prefixString = opcode == REP_PREFIX ? "rep " : "repne ";
// Read the next byte (the actual string instruction opcode)
if (!Decoder.CanReadByte())
{
@ -95,14 +115,14 @@ public class StringInstructionHandler : InstructionHandler
}
}
// Get the mnemonic and operands for the string instruction
// Get the instruction type and operands for the string instruction
if (StringInstructions.TryGetValue(stringOpcode, out var instructionInfo))
{
// Set the mnemonic with the prefix if present
instruction.Mnemonic = prefixString + instructionInfo.Mnemonic;
// Set the instruction type
instruction.Type = instructionInfo.Type;
// Set the operands
instruction.Operands = instructionInfo.Operands;
// Create and set the structured operands
instruction.StructuredOperands = instructionInfo.CreateOperands().ToList();
return true;
}