// source register (5 bits)
private static bool r(uint wInstr, Avr8Disassembler dasm)
{
var iReg = (int)((wInstr >> 4) & 0x10 | (wInstr >> 4) & 0x0F);
dasm.ops.Add(dasm.Register(iReg));
return(true);
}
// Relative jump
private static bool J(uint wInstr, Avr8Disassembler dasm)
{
int offset = (short)((wInstr & 0xFFF) << 4);
offset = offset >> 3;
dasm.ops.Add(AddressOperand.Create(dasm.addr + 2 + offset));
return(true);
}
// Trailing 16-bit absolute address
private static bool w(uint uInstr, Avr8Disassembler dasm)
{
if (!dasm.rdr.TryReadLeUInt16(out ushort w2))
{
return(false);
}
dasm.ops.Add(AddressOperand.Ptr16(w2));
return(true);
}
public override AvrInstruction Decode(Avr8Disassembler dasm, ushort wInstr)
{
int slot = (wInstr >> shift) & mask;
if (!decoders.TryGetValue(slot, out Decoder decoder))
{
return(invalid.Decode(dasm, wInstr));
}
return(decoder.Decode(dasm, wInstr));
}
// Branch offset
private static bool o(uint wInstr, Avr8Disassembler dasm)
{
short offset;
offset = (short)wInstr;
offset = (short)(offset << 6);
offset = (short)(offset >> 8);
offset = (short)(offset & ~1);
dasm.ops.Add(AddressOperand.Create(dasm.addr + offset + 2));
return(true);
}
public override AvrInstruction Decode(Avr8Disassembler dasm, ushort wInstr)
{
int slot = (wInstr >> shift) & mask;
OpRec oprec;
if (!oprecs.TryGetValue(slot, out oprec))
{
return(dasm.Decode(wInstr, Opcode.invalid, InstrClass.Invalid, ""));
}
return(oprec.Decode(dasm, wInstr));
}
public override AvrInstruction Decode(Avr8Disassembler dasm, ushort wInstr)
{
int br = (((wInstr >> 7) & 8) | (wInstr & 7)) & 0xF;
o(wInstr, dasm);
return(new AvrInstruction
{
iclass = InstrClass.ConditionalTransfer,
opcode = branches[br],
operands = dasm.ops.ToArray()
});
}
// absolute address used by jump and call.
private static bool Q(uint wInstr, Avr8Disassembler dasm)
{
if (!dasm.rdr.TryReadLeUInt16(out ushort w2))
{
return(false);
}
dasm.ops.Add(AddressOperand.Ptr32(
(uint)(((wInstr >> 4) & 0x1F) << 18) |
(uint)((wInstr & 1) << 17) |
(uint)(w2 << 1)));
return(true);
}
public override AvrInstruction Decode(Avr8Disassembler dasm, ushort wInstr)
{
foreach (var m in mutators)
{
if (!m(wInstr, dasm))
{
return(invalid.Decode(dasm, wInstr));
}
}
return(new AvrInstruction
{
opcode = opcode,
iclass = iclass,
operands = dasm.ops.ToArray(),
});
}
public override AvrInstruction Decode(Avr8Disassembler dasm, ushort wInstr)
{
int slot = (wInstr >> shift) & mask;
return(oprecs[slot].Decode(dasm, wInstr));
}
public override AvrInstruction Decode(Avr8Disassembler dasm, ushort wInstr)
{
return(dasm.Decode(wInstr, opcode, iclass, fmt));
}
public abstract AvrInstruction Decode(Avr8Disassembler dasm, ushort wInstr);
// Destination register
private static bool D(uint wInstr, Avr8Disassembler dasm)
{
dasm.ops.Add(dasm.Register(((int)wInstr >> 4) & 0x1F));
return(true);
}
private static bool z(uint wInstr, Avr8Disassembler dasm)
{
dasm.ops.Add(dasm.MemD(Avr8Architecture.z, dasm.Displacement((ushort)wInstr)));
return(true);
}
private static bool Z(uint wInstr, Avr8Disassembler dasm)
{
dasm.ops.Add(dasm.MemD(Avr8Architecture.z, 0));
return(true);
}
// source register (r16-r31)
private static bool r4(uint wInstr, Avr8Disassembler dasm)
{
dasm.ops.Add(dasm.Register(0x10 | (int)wInstr & 0x0F));
return(true);
}
// immediate used by adiw/sbiw
private static bool s(uint wInstr, Avr8Disassembler dasm)
{
dasm.ops.Add(ImmediateOperand.Byte((byte)(((wInstr >> 2) & 0x30) | (wInstr & 0xF))));
return(true);
}
// register pair used by adiw
private static bool q(uint wInstr, Avr8Disassembler dasm)
{
dasm.ops.Add(dasm.Register(24 + ((int)(wInstr >> 3) & 6)));
return(true);
}
// register pair source
private static bool P(uint wInstr, Avr8Disassembler dasm)
{
dasm.ops.Add(dasm.Register(((int)wInstr << 1) & ~1));
return(true);
}
public override AvrInstruction Decode(Avr8Disassembler dasm, ushort wInstr)
{
int br = (((wInstr >> 7) & 8) | (wInstr & 7)) & 0xF;
return(dasm.Decode(wInstr, branches[br], InstrClass.ConditionalTransfer, "o"));
}
// 4-bit immediate at bit 0
private static bool I(uint wInstr, Avr8Disassembler dasm)
{
dasm.ops.Add(ImmediateOperand.Byte((byte)(wInstr & 0x0F)));
return(true);
}