コード例 #1
0
        public AArch64Instruction Decode(AArch64Disassembler dasm, uint instr, string fmt)
        {
            AA64Opcode            opcode = this.opcode;
            List <MachineOperand> ops    = new List <MachineOperand>();
            MachineOperand        op     = null;
            int i = 0;
            int off;

            while (i < fmt.Length)
            {
                switch (fmt[i++])
                {
                default: throw new InvalidOperationException(string.Format("Bad format character {0}.", fmt[i - 1]));

                case ',':
                    continue;

                case 'B':   // Logical Bitmask
                    op = LogicalBitmask(dasm, instr, fmt[i++] == 'x');
                    break;

                case 'H':   // 16-bit Immediate constant
                    off = GetOffset(fmt, ref i);
                    op  = ArmImmediateOperand.Word32(GetImm(instr, off, 16));
                    break;

                case 'I':   // 12-bit Immediate constant
                    off = GetOffset(fmt, ref i);
                    op  = ArmImmediateOperand.Word32(GetImm(instr, off, 12));
                    break;

                case 'J':   // long relative branch
                    int offset = (((int)instr) << 6) >> 4;
                    op = new AddressOperand(dasm.rdr.Address + offset);
                    break;

                case 'W':   // (32-bit) W register operand
                    op = GetWReg(instr, GetOffset(fmt, ref i));
                    break;

                case 'X':   // (64-bit) X register operand
                    op = GetXReg(instr, GetOffset(fmt, ref i));
                    break;

                case 's':   // Shift operand by 12
                    off = GetOffset(fmt, ref i);
                    op  = ops[ops.Count - 1];
                    ops.RemoveAt(ops.Count - 1);
                    uint shiftCode = GetImm(instr, off, 2);
                    switch (shiftCode)
                    {
                    case 0: break;

                    case 1:
                        op = new ShiftOperand(op, Opcode.lsl, 12); break;

                    default: throw new FormatException("Reserved value for shift code.");
                    }
                    break;
                }
                ops.Add(op);
            }
            return(AArch64Instruction.Create(opcode, ops));
        }
コード例 #2
0
ファイル: ShiftOperand.cs プロジェクト: mmyydd/reko
 public ShiftOperand(MachineOperand op, Opcode opcode, int shAmt)
     : this(op, opcode, ArmImmediateOperand.Byte((byte)shAmt))
 {
 }