1 /* $NetBSD: brk.S,v 1.13 2013/09/12 15:36:16 joerg 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
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 1.13 2013/09/12 15:36:16 joerg Exp $")
45 #endif /* SYSLIBC_SCCS and not lint */
49 .globl _C_LABEL(__curbrk)
50 .globl _C_LABEL(__minbrk)
60 .xword _C_LABEL(_end) /* lower brk limit; also for gmon code */
67 set _C_LABEL(__minbrk), %o4
69 ldx [%o4], %o1 /* %o1 = minbrk */
70 cmp %o1, %o0 /* if (minbrk > %o0) */
71 movgu %xcc, %o1, %o0 /* %o0 = minbrk */
72 mov %o0, %o2 /* save argument to syscall */
75 set _C_LABEL(__curbrk), %o3
80 retl /* success, return 0 & record new break */
83 #elif __PIC__ - 0 >= 1
87 ldx [%o5 + _C_LABEL(__minbrk)], %o4
88 ldx [%o4], %o1 /* %o1 = minbrk */
89 cmp %o1, %o0 /* if (minbrk > %o0) */
90 movgu %xcc, %o1, %o0 /* %o0 = minbrk */
91 mov %o0, %o2 /* save argument to syscall */
95 ldx [%o5 + _C_LABEL(__curbrk)], %o4
98 retl /* success, return 0 & record new break */
104 sethi %hi(_C_LABEL(__minbrk)), %o1 /* %o1 = minbrk */
105 ldx [%o1 + %lo(_C_LABEL(__minbrk))], %o1
106 cmp %o1, %o0 /* if (minbrk > %o0) */
107 movgu %xcc, %o1, %o0 /* %o0 = minbrk */
108 mov %o0, %o2 /* save argument to syscall */
112 sethi %hi(_C_LABEL(__curbrk)), %g1
115 retl /* success, return 0 & record new break */
116 stx %o2, [%g1 + %lo(_C_LABEL(__curbrk))]