Fix all tests

X86Disassembler/X86/Handlers/Stack/EnterHandler.cs

@@ -0,0 +1,74 @@
+namespace X86Disassembler.X86.Handlers.Stack;
+
+using X86Disassembler.X86.Operands;
+
+/// <summary>
+/// Handler for ENTER instruction (0xC8)
+/// Creates a stack frame for a procedure with nested procedures
+/// </summary>
+public class EnterHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the EnterHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public EnterHandler(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)
+    {
+        // ENTER is 0xC8
+        return opcode == 0xC8;
+    }
+    
+    /// <summary>
+    /// Decodes an ENTER 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)
+    {
+        // ENTER requires 3 bytes: 1 opcode + 2-byte size operand + 1-byte nesting level
+        // Check if we can read the 16-bit size operand
+        if (!Decoder.CanReadUShort())
+        {
+            return false;
+        }
+
+        // Read the size operand (16-bit immediate value)
+        ushort size = Decoder.ReadUInt16();
+        
+        // Check if we can read the nesting level byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+        
+        // Read the nesting level (8-bit immediate value)
+        byte nestingLevel = Decoder.ReadByte();
+        
+        // Set the instruction type
+        instruction.Type = InstructionType.Enter;
+        
+        // Create immediate operands for size and nesting level
+        var sizeOperand = OperandFactory.CreateImmediateOperand(size);
+        var nestingLevelOperand = OperandFactory.CreateImmediateOperand(nestingLevel);
+        
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            sizeOperand,
+            nestingLevelOperand
+        ];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Stack/LeaveHandler.cs

@@ -0,0 +1,45 @@
+namespace X86Disassembler.X86.Handlers.Stack;
+
+/// <summary>
+/// Handler for LEAVE instruction (0xC9)
+/// High-level procedure exit that releases the stack frame set up by a previous ENTER instruction
+/// </summary>
+public class LeaveHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the LeaveHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public LeaveHandler(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)
+    {
+        // LEAVE is 0xC9
+        return opcode == 0xC9;
+    }
+    
+    /// <summary>
+    /// Decodes a LEAVE 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.Leave;
+        
+        // LEAVE has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Stack/PopadHandler.cs

@@ -0,0 +1,45 @@
+namespace X86Disassembler.X86.Handlers.Stack;
+
+/// <summary>
+/// Handler for POPAD instruction (0x61)
+/// Pops all general-purpose registers from the stack in the order: EDI, ESI, EBP, ESP (ignored), EBX, EDX, ECX, EAX
+/// </summary>
+public class PopadHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the PopadHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public PopadHandler(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)
+    {
+        // POPAD is 0x61
+        return opcode == 0x61;
+    }
+    
+    /// <summary>
+    /// Decodes a POPAD 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.Popad;
+        
+        // POPAD has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Stack/PopfdHandler.cs

@@ -0,0 +1,45 @@
+namespace X86Disassembler.X86.Handlers.Stack;
+
+/// <summary>
+/// Handler for POPFD instruction (0x9D)
+/// Pops the value from the stack and loads it into the EFLAGS register
+/// </summary>
+public class PopfdHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the PopfdHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public PopfdHandler(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)
+    {
+        // POPFD is 0x9D
+        return opcode == 0x9D;
+    }
+    
+    /// <summary>
+    /// Decodes a POPFD 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.Popfd;
+        
+        // POPFD has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Stack/PushadHandler.cs

@@ -0,0 +1,45 @@
+namespace X86Disassembler.X86.Handlers.Stack;
+
+/// <summary>
+/// Handler for PUSHAD instruction (0x60)
+/// Pushes all general-purpose registers onto the stack in the order: EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI
+/// </summary>
+public class PushadHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the PushadHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public PushadHandler(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)
+    {
+        // PUSHAD is 0x60
+        return opcode == 0x60;
+    }
+    
+    /// <summary>
+    /// Decodes a PUSHAD 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.Pushad;
+        
+        // PUSHAD has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}

X86Disassembler/X86/Handlers/Stack/PushfdHandler.cs

@@ -0,0 +1,45 @@
+namespace X86Disassembler.X86.Handlers.Stack;
+
+/// <summary>
+/// Handler for PUSHFD instruction (0x9C)
+/// Pushes the EFLAGS register onto the stack
+/// </summary>
+public class PushfdHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the PushfdHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public PushfdHandler(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)
+    {
+        // PUSHFD is 0x9C
+        return opcode == 0x9C;
+    }
+    
+    /// <summary>
+    /// Decodes a PUSHFD 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.Pushfd;
+        
+        // PUSHFD has no operands
+        instruction.StructuredOperands = [];
+
+        return true;
+    }
+}