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
38HIDENAME(minbrk):
39        .long   CNAME(_end)
40
41        .text
42
43ENTRY(brk)
44#ifdef PIC
45	mflr    %r10
46	bl	_GLOBAL_OFFSET_TABLE_@local-4
47	mflr	%r9
48	mtlr	%r10
49	lwz	%r5,HIDENAME(minbrk)@got(%r9)
50	lwz	%r6,0(%r5)
51#else
52	lis	%r5,HIDENAME(minbrk)@ha
53	lwz	%r6,HIDENAME(minbrk)@l(%r5)
54#endif
55	cmplw   %r6,%r3			/* if (minbrk <= r3) */
56	bgt     0f
57	mr	%r6,%r3			/* r6 = r3 */
580:
59	mr      %r3,%r6			/* new break value */
60	li      %r0,SYS_break
61	sc				/* assume, that r5 is kept */
62	bso	1f
63#ifdef PIC
64	lwz	%r7,HIDENAME(curbrk)@got(%r9)
65	stw	%r6,0(%r7)
66#else
67	lis	%r7,HIDENAME(curbrk)@ha /* record new break */
68	stw	%r6,HIDENAME(curbrk)@l(%r7)
69#endif
70	blr				/* return 0 */
71
721:
73	b	PIC_PLT(HIDENAME(cerror))
74
75	.section .note.GNU-stack,"",%progbits
76