Subversion Repositories ssbcc

# Copyright 2014, Sinclair R.F., Inc.

def push16(ad):

  """

  User-defined macro to push a 16 bit value onto the data stack so that the LSB

  is deepest in the data stack and the MSB is at the top of the data stack.\n

  Usage:

    .push16(v)

  where

    v           is a 16-bit value, a constant, or an evaluated expression\n

  The effect is to push v%0x100 and int(v/2**8)%0x100 onto the data stack.\n

  ( - u_LSB u_MSB )

  """

  # Add the macro to the list of recognized macros.

  ad.AddMacro('.push16', 2, [ ['','singlevalue','symbol'] ]);

  # Define the macro functionality.

  def emitFunction(ad,fp,argument):

    argument = argument[0];

    v = ad.Emit_IntegerValue(argument);

    if not (-2**15 <= v < 2**16):

      raise asmDef.AsmException('Argument "%s" should be a 16-bit integer at %s' % (argument['value'],argument['loc'],));

    printString = argument['value'] if type(argument['value']) == str else '0x%04X' % (v % 2**16);

    ad.EmitPush(fp,v%0x100,'');

    v >>= 8;

    ad.EmitPush(fp,v%0x100,'.push16(%s)' % printString);

  ad.EmitFunction['.push16'] = emitFunction;