Added support for CALL r/m32 (0xFF /2) and ADD r32, r/m32 (0x03) instructions with tests

X86Disassembler/X86/Handlers/Add/AddR32Rm32Handler.cs

@@ -0,0 +1,73 @@
+namespace X86Disassembler.X86.Handlers.Add;
+
+/// <summary>
+/// Handler for ADD r32, r/m32 instruction (0x03)
+/// </summary>
+public class AddR32Rm32Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the AddR32Rm32Handler 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 AddR32Rm32Handler(byte[] codeBuffer, InstructionDecoder decoder, int length)
+        : base(codeBuffer, decoder, length)
+    {
+    }
+
+    /// <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 == 0x03;
+    }
+
+    /// <summary>
+    /// Decodes an ADD r32, r/m32 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)
+    {
+        int position = Decoder.GetPosition();
+
+        if (position >= Length)
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        byte modRM = CodeBuffer[position++];
+        Decoder.SetPosition(position);
+
+        // Extract the fields from the ModR/M byte
+        byte mod = (byte)((modRM & 0xC0) >> 6);
+        byte reg = (byte)((modRM & 0x38) >> 3);
+        byte rm = (byte)(modRM & 0x07);
+
+        // Set the mnemonic
+        instruction.Mnemonic = "add";
+
+        // Get the register name
+        string regName = GetRegister32(reg);
+
+        // For memory operands, set the operand
+        if (mod != 3) // Memory operand
+        {
+            string operand = ModRMDecoder.DecodeModRM(mod, rm, false);
+            instruction.Operands = $"{regName}, {operand}";
+        }
+        else // Register operand
+        {
+            string rmName = GetRegister32(rm);
+            instruction.Operands = $"{regName}, {rmName}";
+        }
+
+        return true;
+    }
+}