public override MipsInstruction Decode(uint wInstr, MicroMipsDisassembler dasm)
{
if (!dasm.rdr.TryReadUInt16(out ushort uLow16Bits))
{
return(dasm.CreateInvalidInstruction());
}
uint uInstrNew = (wInstr << 16) | uLow16Bits;
return(decoder.Decode(uInstrNew, dasm));
}
// m - memory access: base + offset with 3-bit register encoding
private static bool mb(uint uInstr, MicroMipsDisassembler dasm)
{
var encodedBase = baseField16.Read(uInstr);
var iBase = threeBitRegisterEncodings[encodedBase];
var baseReg = dasm.arch.GetRegister(iBase);
var encOffset = offsetField16.Read(uInstr);
var offset = encodedByteOffsets[encOffset];
var mop = new IndirectOperand(PrimitiveType.Byte, offset, baseReg);
dasm.ops.Add(mop);
return(true);
}
public override MipsInstruction Decode(uint wInstr, MicroMipsDisassembler dasm)
{
foreach (var mutator in mutators)
{
if (!mutator(wInstr, dasm))
{
return(dasm.CreateInvalidInstruction());
}
}
var ops = dasm.ops;
var instr = new MipsInstruction
{
Mnemonic = this.opcode,
InstructionClass = this.iclass,
Operands = ops.ToArray()
};
ops.Clear();
return(instr);
}
public override MipsInstruction Decode(uint wInstr, MicroMipsDisassembler dasm)
{
foreach (var mutator in mutators)
{
if (!mutator(wInstr, dasm))
{
return(dasm.CreateInvalidInstruction());
}
}
var ops = dasm.ops;
var instr = new MipsInstruction
{
opcode = this.opcode,
InstructionClass = this.iclass,
op1 = ops.Count > 0 ? ops[0] : null,
op2 = ops.Count > 1 ? ops[1] : null,
op3 = ops.Count > 2 ? ops[2] : null,
op4 = ops.Count > 3 ? ops[3] : null,
};
ops.Clear();
return(instr);
}
private static bool Is64Bit(uint uInstr, MicroMipsDisassembler dasm)
{
return(dasm.arch.WordWidth.BitSize == 64);
}