1107571Sgrehan/*-
2107571Sgrehan * Copyright (c) 2002 Peter Grehan.
3107571Sgrehan * All rights reserved.
4107571Sgrehan *
5107571Sgrehan * Redistribution and use in source and binary forms, with or without
6107571Sgrehan * modification, are permitted provided that the following conditions
7107571Sgrehan * are met:
8107571Sgrehan * 1. Redistributions of source code must retain the above copyright
9107571Sgrehan *    notice, this list of conditions and the following disclaimer.
10107571Sgrehan * 2. Redistributions in binary form must reproduce the above copyright
11107571Sgrehan *    notice, this list of conditions and the following disclaimer in the
12107571Sgrehan *    documentation and/or other materials provided with the distribution.
13107571Sgrehan *
14107571Sgrehan * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15107571Sgrehan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16107571Sgrehan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17107571Sgrehan * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18107571Sgrehan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19107571Sgrehan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20107571Sgrehan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21107571Sgrehan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22107571Sgrehan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23107571Sgrehan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24107571Sgrehan * SUCH DAMAGE.
25107571Sgrehan */
26107571Sgrehan/*      $NetBSD: brk.S,v 1.9 2000/06/26 06:25:43 kleink Exp $   */
27107571Sgrehan
28107571Sgrehan#include <machine/asm.h>
29107571Sgrehan__FBSDID("$FreeBSD$");
30107571Sgrehan
31107571Sgrehan#include "SYS.h"
32107571Sgrehan
33107571Sgrehan        .globl  HIDENAME(curbrk)
34107571Sgrehan        .globl  HIDENAME(minbrk)
35107571Sgrehan        .globl  CNAME(_end)
36107571Sgrehan
37107571Sgrehan        .data
38107571SgrehanHIDENAME(minbrk):
39107571Sgrehan        .long   CNAME(_end)
40107571Sgrehan
41107571Sgrehan        .text
42107571Sgrehan
43107571SgrehanENTRY(brk)
44107571Sgrehan#ifdef PIC
45107571Sgrehan	mflr    %r10
46107571Sgrehan	bl	_GLOBAL_OFFSET_TABLE_@local-4
47107571Sgrehan	mflr	%r9
48107571Sgrehan	mtlr	%r10
49107571Sgrehan	lwz	%r5,HIDENAME(minbrk)@got(%r9)
50107571Sgrehan	lwz	%r6,0(%r5)
51107571Sgrehan#else
52107571Sgrehan	lis	%r5,HIDENAME(minbrk)@ha
53107571Sgrehan	lwz	%r6,HIDENAME(minbrk)@l(%r5)
54107571Sgrehan#endif
55107571Sgrehan	cmplw   %r6,%r3			/* if (minbrk <= r3) */
56107571Sgrehan	bgt     0f
57107571Sgrehan	mr	%r6,%r3			/* r6 = r3 */
58107571Sgrehan0:
59107571Sgrehan	mr      %r3,%r6			/* new break value */
60107571Sgrehan	li      %r0,SYS_break
61107571Sgrehan	sc				/* assume, that r5 is kept */
62107571Sgrehan	bso	1f
63107571Sgrehan#ifdef PIC
64107571Sgrehan	lwz	%r7,HIDENAME(curbrk)@got(%r9)
65107571Sgrehan	stw	%r6,0(%r7)
66107571Sgrehan#else
67107571Sgrehan	lis	%r7,HIDENAME(curbrk)@ha /* record new break */
68107571Sgrehan	stw	%r6,HIDENAME(curbrk)@l(%r7)
69107571Sgrehan#endif
70107571Sgrehan	blr				/* return 0 */
71107571Sgrehan
72107571Sgrehan1:
73107571Sgrehan	b	PIC_PLT(HIDENAME(cerror))
74217398Skib
75217398Skib	.section .note.GNU-stack,"",%progbits
76