1 /* $NetBSD: sbrk.S,v 1.11 2013/09/14 05:38:00 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
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: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp
38 #include <machine/asm.h>
39 #if defined(SYSLIBC_SCCS) && !defined(lint)
41 .asciz "@(#)sbrk.s 8.1 (Berkeley) 6/4/93"
43 RCSID("$NetBSD: sbrk.S,v 1.11 2013/09/14 05:38:00 nakayama Exp $")
45 #endif /* SYSLIBC_SCCS and not lint */
49 .globl _C_LABEL(__curbrk)
53 WEAK_ALIAS(sbrk, _sbrk)
66 set _C_LABEL(__curbrk), %o3
68 ldx [%o2], %o3 /* %o3 = old break */
69 add %o3, %o0, %o4 /* %o4 = new break */
70 mov %o4, %o0 /* copy for syscall */
72 t ST_SYSCALL /* break(new_break) */
73 bcc,a 1f /* if success, */
74 mov %o3, %o0 /* set return value */
77 retl /* and update curbrk */
80 #elif __PIC__ - 0 >= 1
84 ldx [%o5 + _C_LABEL(__curbrk)], %o2
85 ldx [%o2], %o3 /* %o3 = old break */
86 add %o3, %o0, %o4 /* %o4 = new break */
87 mov %o4, %o0 /* copy for syscall */
89 t ST_SYSCALL /* break(new_break) */
90 bcc,a 1f /* if success, */
91 mov %o3, %o0 /* set return value */
94 retl /* and update curbrk */
100 sethi %hi(_C_LABEL(__curbrk)), %o2
101 ldx [%o2 + %lo(_C_LABEL(__curbrk))], %o3 /* %o3 = old break */
102 add %o3, %o0, %o4 /* %o4 = new break */
103 mov %o4, %o0 /* copy for syscall */
105 t ST_SYSCALL /* break(new_break) */
106 bcc,a 1f /* if success, */
107 mov %o3, %o0 /* set return value */
110 retl /* and update curbrk */
111 stx %o4, [%o2 + %lo(_C_LABEL(__curbrk))]