1 /* $NetBSD: brk.S,v 1.15 2008/11/06 13:42:55 nakayama Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * from: Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp
38 #include <machine/asm.h>
39 #if defined(SYSLIBC_SCCS) && !defined(lint)
41 .asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93"
43 RCSID("$NetBSD: brk.S,v 1.15 2008/11/06 13:42:55 nakayama Exp $")
45 #endif /* SYSLIBC_SCCS and not lint */
50 .globl _C_LABEL(__minbrk)
59 .long _end ! lower brk limit; also for gmon code
65 set _C_LABEL(__minbrk), %o4
67 ld [%o4], %o1 ! %o1 = minbrk
68 cmp %o1, %o0 ! if (minbrk > %o0)
70 mov %o1, %o0 ! %o0 = minbrk
72 mov %o0, %o2 ! save argument to syscall
80 retl ! success, return 0 & record new break
83 sethi %hi(_C_LABEL(__minbrk)), %o1 ! %o1 = minbrk
84 ld [%o1 + %lo(_C_LABEL(__minbrk))], %o1
85 cmp %o1, %o0 ! if (minbrk > %o0)
87 mov %o1, %o0 ! %o0 = minbrk
89 mov %o0, %o2 ! save argument to syscall
93 sethi %hi(CURBRK), %g1
96 retl ! success, return 0 & record new break
97 st %o2, [%g1 + %lo(CURBRK)]