sbrk.S revision 209878 
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: head/lib/libc/powerpc64/sys/sbrk.S 209878 2010-07-10 14:45:03Z nwhitehorn $");
30
31#include "SYS.h"
32
33	.globl	HIDENAME(curbrk)
34	.globl	CNAME(_end)
35
36	.data
37HIDENAME(curbrk):
38	.llong	CNAME(_end)
39
40	.text
41ENTRY(sbrk)
42	addis	%r5,%r2,HIDENAME(curbrk)@toc@ha
43	addi	%r5,%r5,HIDENAME(curbrk)@toc@l
44	ld	%r6,0(%r5)			/* r6 = old break */
45	cmpdi	%r3,0				/* sbrk(0) - return curbrk */
46	beq	1f
47	add	%r3,%r3,%r6
48	mr	%r7,%r3				/* r7 = new break */
49	li	%r0,SYS_break
50	sc					/* break(new_break) */
51	bso	2f
52	std     %r7,0(%r5)
531:
54	mr      %r3,%r6				/* set return value */
55	blr
562:
57	mflr	%r0
58	std	%r0,16(%r1)
59	stdu	%r1,-48(%r1)
60	bl	PIC_PLT(HIDENAME(cerror))
61	nop
62	ld	%r1,0(%r1)
63	ld	%r0,16(%r1)
64	mtlr	%r0
65	blr
66