1/*-
2 * Copyright (c) 2002 Peter Grehan.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26/*      $NetBSD: sbrk.S,v 1.8 2000/06/26 06:25:44 kleink Exp $  */
27
28#include <machine/asm.h>
29__FBSDID("$FreeBSD$");
30
31#include "SYS.h"
32
33	.globl	HIDENAME(curbrk)
34	.globl	CNAME(_end)
35
36	.data
37HIDENAME(curbrk):
38	.long	CNAME(_end)
39
40	.text
41ENTRY(sbrk)
42
43#ifdef PIC
44	mflr	%r10
45	bl	_GLOBAL_OFFSET_TABLE_@local-4
46	mflr	%r5
47	mtlr	%r10
48	lwz	%r5,HIDENAME(curbrk)@got(%r5)
49	lwz	%r6,0(%r5)
50#else
51	lis	%r5,HIDENAME(curbrk)@ha
52	lwz	%r6,HIDENAME(curbrk)@l(%r5)	/* r6 = old break */
53#endif
54	cmpwi	%r3,0				/* sbrk(0) - return curbrk */
55	beq	1f
56	add	%r3,%r3,%r6
57	mr	%r7,%r3				/* r7 = new break */
58	li	%r0,SYS_break
59	sc					/* break(new_break) */
60	bso	2f
61#ifdef PIC
62	stw     %r7,0(%r5)
63#else
64	stw     %r7,HIDENAME(curbrk)@l(%r5)	/* record new break */
65#endif
661:
67	mr      %r3,%r6				/* set return value */
68	blr
692:
70	b	PIC_PLT(HIDENAME(cerror))
71
72	.section .note.GNU-stack,"",%progbits
73