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/* sbrk for MMIXware.

   Copyright (C) 2001 Hans-Peter Nilsson

   Permission to use, copy, modify, and distribute this software is

   freely granted, provided that the above copyright notice, this notice

   and the following disclaimer are preserved with no changes.

   THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

   IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

   PURPOSE.  */

#include <_ansi.h>

#include <sys/types.h>

#include <sys/stat.h>

#include "sys/syscall.h"

extern char *_Sbrk_high;

/* When the program is loaded, the first location in Pool_Segment holds

   the first available octabyte in the memory pool (a.k.a. the heap);

   somewhere after the command-line parameters.  We don't have to

   initialize that location, we can just use it straight up as a pointer;

   just point the symbol there.

   This file will be compiled with -no-builtin-syms, so we need to define

   Pool_Segment and any other symbols that would be predefined in mmixal.  */

__asm__ (" .global _Sbrk_high\n"

         "_Sbrk_high    IS      Pool_Segment\n"

         "Pool_Segment  IS      0x40<<56");

caddr_t

_sbrk (size_t incr)

{

  extern char end;              /* Defined by the linker */

  char *prev_heap_end;

  prev_heap_end = _Sbrk_high;

  _Sbrk_high += incr;

  return (caddr_t) prev_heap_end;

}