1/*	$OpenBSD: sbrk.S,v 1.5 2005/08/07 16:40:15 espie Exp $ */
2/*
3 * Copyright (c) 1992, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This software was developed by the Computer Systems Engineering group
7 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
8 * contributed to Berkeley.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include "SYS.h"
36
37	.globl	_end
38	.globl	__curbrk
39
40	.data
41__curbrk:	.long	_end
42	.text
43
44ENTRY(sbrk)
45#ifdef PIC
46	PIC_PROLOGUE(%o5,%o4)
47	ld	[%o5 + __curbrk], %o2
48	ld	[%o2], %o3			! %o3 = old break
49	add	%o3, %o0, %o4			! %o4 = new break
50	mov	%o4, %o0			! copy for syscall
51	mov	SYS_break, %g1
52	t	ST_SYSCALL			! break(new_break)
53	bcc,a	1f				! if success,
54	 mov	%o3, %o0			!    set return value
55	ERROR()
561:
57	retl					! and update curbrk
58	 st	%o4, [%o2]
59#else
60	sethi	%hi(__curbrk), %o2
61	ld	[%o2 + %lo(__curbrk)], %o3	! %o3 = old break
62	add	%o3, %o0, %o4			! %o4 = new break
63	mov	%o4, %o0			! copy for syscall
64	mov	SYS_break, %g1
65	t	ST_SYSCALL			! break(new_break)
66	bcc,a	1f				! if success,
67	 mov	%o3, %o0			!    set return value
68	ERROR()
691:
70	retl					! and update curbrk
71	 st	%o4, [%o2 + %lo(__curbrk)]
72#endif
73