Subversion Repositories ssbcc

# Copyright 2014, Sinclair R.F., Inc.
 
def push24(ad):
  """
  User-defined macro to push a 24 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.
  Usage:
    .push24(v)
  where
    v           is a 24-bit value, a constant, or an evaluated expression\n
  The effect is to push v%0x100, int(v/2**8)%0x100, and int(v/2**16)%0x100 onto
  the data stack.\n
  ( - u_LSB u u_MSB )
  """
 
  # Add the macro to the list of recognized macros.
  ad.AddMacro('.push24', 3, [ ['','singlevalue','symbol'] ]);
 
  # Define the macro functionality.
  def emitFunction(ad,fp,argument):
    argument = argument[0];
    v = ad.Emit_IntegerValue(argument);
    if not (-2**23 <= v < 2**24):
      raise asmDef.AsmException('Argument "%s" should be a 24-bit integer at %s' % (argument['value'],argument['loc'],));
    printString = argument['value'] if type(argument['value']) == str else '0x%04X' % (v % 2**24);
    for ix in range(3-1):
      ad.EmitPush(fp,v%0x100,'');
      v >>= 8;
    ad.EmitPush(fp,v%0x100,'.push24(%s)' % printString);
 
  ad.EmitFunction['.push24'] = emitFunction;