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: brk.S,v 1.9 2000/06/26 06:25:43 kleink Exp $   */
27
28#include <machine/asm.h>
29__FBSDID("$FreeBSD$");
30
31#include "SYS.h"
32
33        .globl  HIDENAME(curbrk)
34        .globl  HIDENAME(minbrk)
35        .globl  CNAME(_end)
36
37        .data
38        .align 3
39HIDENAME(minbrk):
40        .llong   CNAME(_end)
41
42        .text
43
44ENTRY(brk)
45	addis	%r6,%r2,HIDENAME(minbrk)@toc@ha
46	ld	%r6,HIDENAME(minbrk)@toc@l(%r6)
47	cmpld   %r6,%r3			/* if (minbrk <= r3) */
48	bgt     0f
49	mr	%r6,%r3			/* r6 = r3 */
500:
51	mr      %r3,%r6			/* new break value */
52	li      %r0,SYS_break
53	sc				/* assume, that r5 is kept */
54	bso	1f
55
56	/* record new break */
57	addis	%r7,%r2,HIDENAME(curbrk)@toc@ha
58	std	%r6,HIDENAME(curbrk)@toc@l(%r7)
59
60	blr				/* return 0 */
61
621:
63	mflr	%r0
64	std	%r0,16(%r1)
65	stdu	%r1,-48(%r1)
66	bl	HIDENAME(cerror)
67	nop
68	ld	%r1,0(%r1)
69	ld	%r0,16(%r1)
70	mtlr	%r0
71	blr
72
73	.section .note.GNU-stack,"",%progbits
74