1/* $NetBSD: brk.S,v 1.9 2001/05/07 17:19:17 kleink Exp $ */
2
3/*
4 * Copyright (c) 1994, 1995 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
22 *  School of Computer Science
23 *  Carnegie Mellon University
24 *  Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30#include "SYS.h"
31
32          .globl    _end
33IMPORT(__curbrk, 8)
34
35#ifdef WEAK_ALIAS
36WEAK_ALIAS(brk, _brk)
37#endif
38
39          .data
40EXPORT(__minbrk)
41          .quad     _end
42
43          .text
44LEAF(_brk, 1)
45          br        pv, L1                                  /* XXX profiling */
46L1:       LDGP(pv)
47          ldq       v0, __minbrk
48          cmpult  a0, v0, t0
49          cmovne  t0, v0, a0
50          CALLSYS_ERROR(break)
51          stq       a0, __curbrk
52          mov       zero, v0
53          RET
54END(_brk)
55