Added support for far call instructions and PUSH imm16. Fixed invalid test cases in call_tests.csv and or_tests.csv

X86Disassembler/X86/Handlers/Push/PushImm16Handler.cs

@@ -0,0 +1,67 @@
+namespace X86Disassembler.X86.Handlers.Push;
+
+using Operands;
+
+/// <summary>
+/// Handler for PUSH imm16 instruction with operand size prefix (0x66 0x68)
+/// </summary>
+public class PushImm16Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the PushImm16Handler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public PushImm16Handler(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)
+    {
+        // Check for operand size prefix (66h) followed by PUSH imm (68h)
+        if (opcode != 0x68)
+        {
+            return false;
+        }
+        
+        // Check if we have an operand size prefix
+        return Decoder.HasOperandSizePrefix();
+    }
+    
+    /// <summary>
+    /// Decodes a PUSH imm16 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.Push;
+
+        // Check if we have enough bytes for the 16-bit immediate
+        if(!Decoder.CanReadUShort())
+        {
+            return false;
+        }
+
+        // Read the 16-bit immediate value
+        ushort imm16 = Decoder.ReadUInt16();
+        
+        // Create an immediate operand with 16-bit size
+        var immOperand = new ImmediateOperand(imm16, 16);
+        
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            immOperand
+        ];
+
+        return true;
+    }
+}