lib/libc/pc532/sys/sbrk.s

   1 /*
   2  * Copyright (c) 1992 Helsinki University of Technology
   3  * All Rights Reserved.
   4  *
   5  * Permission to use, copy, modify and distribute this software and its
   6  * documentation is hereby granted, provided that both the copyright
   7  * notice and this permission notice appear in all copies of the
   8  * software, derivative works or modified versions, and any portions
   9  * thereof, and that both notices appear in supporting documentation.
  10  *
  11  * HELSINKI UNIVERSITY OF TECHNOLOGY ALLOWS FREE USE OF THIS SOFTWARE IN
  12  * ITS "AS IS" CONDITION. HELSINKI UNIVERSITY OF TECHNOLOGY DISCLAIMS ANY
  13  * LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE
  14  * USE OF THIS SOFTWARE.
  15  */
  16 /*
  17  * HISTORY
  18  * 29-Apr-92  Johannes Helander (jvh) at Helsinki University of Technology
  19  *      Created.
  20  *
  21  *      $Id: sbrk.s,v 1.1 1993/09/17 18:43:49 phil Exp $
  22  */
  23
  24 #include <sys/syscall.h>
  25 #include "SYS.h"
  26
  27         .globl  _end
  28         .globl  _curbrk
  29         .globl  _minbrk
  30
  31         .data
  32 _curbrk:        .long   _end
  33 _minbrk:        .long   _end
  34         .text
  35
  36 ENTRY(sbrk)
  37         addd    _curbrk(pc), S_ARG0
  38         movd    SYS_break,r0
  39         SVC
  40         bcs     cerror
  41         movd    _curbrk(pc), r0
  42         movd    S_ARG0,_curbrk(pc)              /* XXX check this b*/
  43         ret     0