public void Assemble(Instruction instruction, ICodeBlock codeBlock, int address)
{
var romOffset = codeBlock.ConvertMappedAddressToRomOffset(address);
var data = OpcodeTables.Encode(instruction.AddressingMode, instruction.Opcode);
codeBlock.Rom[romOffset] = unchecked ((byte)data);
var operand = instruction.Operand;
for (var i = 1; i < instruction.Length; i++)
{
codeBlock.Rom[romOffset + i] = unchecked ((byte)operand);
operand >>= 8;
}
}
public LocatedInstruction Disassemble(ICodeBlock codeBlock, int address)
{
var romOffset = codeBlock.ConvertMappedAddressToRomOffset(address);
var input = codeBlock.Rom[romOffset];
var decoded = OpcodeTables.Decode(input);
var result = new LocatedInstruction
{
AddressingMode = decoded.AddressingMode,
Opcode = decoded.Opcode,
Address = address
};
switch (result.Length)
{
case 2:
result.Operand = GetOperand(codeBlock, romOffset);
break;
case 3:
result.Operand = GetFullOperand(codeBlock, romOffset);
break;
}
return(result);
}