public override XtensaInstruction Decode(XtensaDisassembler dasm)
{
if (this.twoByte)
{
dasm.rdr.Offset -= 1;
}
return(dasm.DecodeOperands(opcode, fmt));
}
public override XtensaInstruction Decode(XtensaDisassembler dasm)
{
return(new XtensaInstruction
{
Opcode = this.opcode,
Operands = new MachineOperand[] {
dasm.GetAluRegister(dasm.state.s),
ImmediateOperand.Byte((byte)(((dasm.state.r & 1) << 4) | dasm.state.t)),
dasm.JumpOffset(dasm.state.imm8)
}
});
}
public override XtensaInstruction Decode(XtensaDisassembler dasm)
{
return(new XtensaInstruction
{
Opcode = Opcodes.extui,
Operands = new MachineOperand[]
{
dasm.GetAluRegister(dasm.state.r),
dasm.GetAluRegister(dasm.state.t),
ImmediateOperand.Byte((byte)((dasm.state.s | ((dasm.state.op1 & 1) << 4)))),
ImmediateOperand.Byte((byte)(dasm.state.op2 + 1))
}
});
}
public override XtensaInstruction Decode(XtensaDisassembler dasm)
{
var n =
dasm.state.r |
((dasm.state.t & 0x3) << 4);
var dst = dasm.JumpOffset((byte)n);
// this is a 2-byte instruction, so back up one byte.
dasm.rdr.Offset -= 1;
return(new XtensaInstruction
{
Opcode = opcode,
Operands = new MachineOperand[]
{
dasm.GetAluRegister(dasm.state.s),
dst,
}
});
}
public override XtensaInstruction Decode(XtensaDisassembler dasm)
{
int shoff = dasm.state.imm12;
if (shoff > 0x7FF)
{
shoff |= ~0x7FF;
}
var dst = AddressOperand.Ptr32((uint)
((int)dasm.state.addr.ToUInt32() + 4 + shoff));
return(new XtensaInstruction
{
Opcode = opcode,
Operands = new MachineOperand[]
{
dasm.GetAluRegister(dasm.state.s),
dst,
}
});
}
public override XtensaInstruction Decode(XtensaDisassembler dasm)
{
var n =
dasm.state.r |
((dasm.state.t & 0x7) << 4) |
(((dasm.state.t & 0x6) == 0x6)
? ~0x1F
: 0);
var imm = ImmediateOperand.SByte((sbyte)n);
// this is a 2-byte instruction, so back up one byte.
dasm.rdr.Offset -= 1;
return(new XtensaInstruction
{
Opcode = Opcodes.movi_n,
Operands = new MachineOperand[]
{
dasm.GetAluRegister(dasm.state.s),
imm,
}
});
}
public override XtensaInstruction Decode(XtensaDisassembler dasm)
{
return(aOprecs[dasm.state.t].Decode(dasm));
}
public abstract XtensaInstruction Decode(XtensaDisassembler dasm);
public override XtensaInstruction Decode(XtensaDisassembler dasm)
{
return(decoders[dasm.state.s].Decode(dasm));
}
