private static bool P(uint u, Tms7000Disassembler dasm)
{
if (!dasm.rdr.TryReadByte(out byte b))
{
return(false);
}
dasm.ops.Add(new RegisterOperand(dasm.arch.Ports[b]));
return(true);
}
private static bool DB(uint b, Tms7000Disassembler dasm)
{
if (!dasm.rdr.TryReadBeUInt16(out ushort w))
{
return(false);
}
dasm.ops.Add(MemoryOperand.Indexed(Address.Ptr16(w), dasm.arch.b));
return(true);
}
// indirect
private static bool Indirect(uint u, Tms7000Disassembler dasm)
{
if (!dasm.rdr.TryReadByte(out byte b))
{
return(false);
}
dasm.ops.Add(MemoryOperand.Indirect(dasm.arch.GpRegs[b]));
return(true);
}
// short PC-relative jump
private static bool j(uint u, Tms7000Disassembler dasm)
{
if (!dasm.rdr.TryReadByte(out byte b))
{
return(false);
}
dasm.ops.Add(AddressOperand.Create(dasm.rdr.Address + (sbyte)b));
return(true);
}
private static bool I(uint b, Tms7000Disassembler dasm)
{
if (!dasm.rdr.TryReadBeUInt16(out ushort w))
{
return(false);
}
dasm.ops.Add(ImmediateOperand.Word16(w));
return(true);
}
private static bool i(uint u, Tms7000Disassembler dasm)
{
if (!dasm.rdr.TryReadByte(out byte b))
{
return(false);
}
dasm.ops.Add(ImmediateOperand.Byte(b));
return(true);
}
public override Tms7000Instruction Decode(uint b, Tms7000Disassembler dasm)
{
foreach (var m in mutators)
{
if (!m(b, dasm))
{
return(dasm.CreateInvalidInstruction());
}
}
var instr = new Tms7000Instruction
{
Mnemonic = opcode,
InstructionClass = iclass,
Operands = dasm.ops.ToArray()
};
return(instr);
}
public Tms7000Instruction Decode(byte b, Tms7000Disassembler dasm)
{
foreach (var m in mutators)
{
if (!m(b, dasm))
{
return(Invalid());
}
}
var instr = new Tms7000Instruction
{
Opcode = opcode,
InstructionClass = iclass,
op1 = dasm.ops.Count > 0 ? dasm.ops[0] : null,
op2 = dasm.ops.Count > 1 ? dasm.ops[1] : null,
op3 = dasm.ops.Count > 2 ? dasm.ops[2] : null,
};
return(instr);
}
private static bool S(uint b, Tms7000Disassembler dasm)
{
dasm.ops.Add(new RegisterOperand(dasm.arch.st));
return(true);
}
