Implemented additional SBB instruction handlers for register-register and register-memory operations

X86Disassembler/X86/Handlers/Sbb/SbbRm8R8Handler.cs

@@ -0,0 +1,64 @@
+using X86Disassembler.X86.Operands;
+
+namespace X86Disassembler.X86.Handlers.Sbb;
+
+/// <summary>
+/// Handler for SBB r/m8, r8 instruction (0x18)
+/// </summary>
+public class SbbRm8R8Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the SbbRm8R8Handler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public SbbRm8R8Handler(InstructionDecoder decoder)
+        : base(decoder)
+    {
+    }
+
+    /// <summary>
+    /// Checks if this handler can decode the given opcode
+    /// </summary>
+    /// <param name="opcode">The opcode to check</param>
+    /// <returns>True if this handler can decode the opcode</returns>
+    public override bool CanHandle(byte opcode)
+    {
+        return opcode == 0x18;
+    }
+
+    /// <summary>
+    /// Decodes a SBB r/m8, r8 instruction
+    /// </summary>
+    /// <param name="opcode">The opcode of the instruction</param>
+    /// <param name="instruction">The instruction object to populate</param>
+    /// <returns>True if the instruction was successfully decoded</returns>
+    public override bool Decode(byte opcode, Instruction instruction)
+    {
+        // Set the instruction type
+        instruction.Type = InstructionType.Sbb;
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For SBB r/m8, r8 (0x18):
+        // - The r/m field with mod specifies the destination operand (register or memory)
+        // - The reg field specifies the source register
+        var (_, reg, _, destinationOperand) = ModRMDecoder.ReadModRM8();
+
+        // Create the register operand for the reg field (8-bit)
+        var sourceOperand = OperandFactory.CreateRegisterOperand8(reg);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            sourceOperand
+        ];
+
+        return true;
+    }
+}