1/*	$NetBSD: sbrk.S,v 1.10 2007/10/08 13:06:00 uwe Exp $	*/
2
3/*
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
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.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
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.
22 *
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
33 * SUCH DAMAGE.
34 *
35 * from: Header: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp
36 */
37
38#include <machine/asm.h>
39#if defined(SYSLIBC_SCCS) && !defined(lint)
40#if 0
41	.asciz "@(#)sbrk.s	8.1 (Berkeley) 6/4/93"
42#else
43	RCSID("$NetBSD: sbrk.S,v 1.10 2007/10/08 13:06:00 uwe Exp $")
44#endif
45#endif /* SYSLIBC_SCCS and not lint */
46
47#include "SYS.h"
48
49	.globl	_end
50	.globl	CURBRK
51
52#ifdef WEAK_ALIAS
53WEAK_ALIAS(sbrk, _sbrk)
54#endif
55
56	.data
57CURBRK:	.long	_end
58	.text
59
60ENTRY(_sbrk)
61#ifdef __PIC__
62	PIC_PROLOGUE(%o5,%o4)
63	set	CURBRK, %o2
64	ld	[%o5 + %o2], %o2
65	ld	[%o2], %o3			! %o3 = old break
66	add	%o3, %o0, %o4			! %o4 = new break
67	mov	%o4, %o0			! copy for syscall
68	mov	SYS_break, %g1
69	t	ST_SYSCALL			! break(new_break)
70	bcc,a	1f				! if success,
71	 mov	%o3, %o0			!    set return value
72	ERROR()
731:
74	retl					! and update curbrk
75	 st	%o4, [%o2]
76#else
77	sethi	%hi(CURBRK), %o2
78	ld	[%o2 + %lo(CURBRK)], %o3	! %o3 = old break
79	add	%o3, %o0, %o4			! %o4 = new break
80	mov	%o4, %o0			! copy for syscall
81	mov	SYS_break, %g1
82	t	ST_SYSCALL			! break(new_break)
83	bcc,a	1f				! if success,
84	 mov	%o3, %o0			!    set return value
85	ERROR()
861:
87	retl					! and update curbrk
88	 st	%o4, [%o2 + %lo(CURBRK)]
89#endif
90