1/*	$NetBSD: sbrk.S,v 1.7 2003/08/07 16:42:05 agc Exp $	*/
2
3/*-
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *	from: @(#)sbrk.s	5.1 (Berkeley) 4/23/90
32 */
33
34#include <machine/asm.h>
35__FBSDID("$FreeBSD$");
36#include "SYS.h"
37
38	.globl	_C_LABEL(_end)
39
40#ifdef WEAK_ALIAS
41WEAK_ALIAS(sbrk, _sbrk)
42#endif
43
44	.data
45	.align	0
46	.globl	CURBRK
47	.type	CURBRK,#object
48CURBRK:
49	.word	_C_LABEL(_end)
50
51/*
52 * Change the data segment size
53 */
54ENTRY(_sbrk)
55#ifdef PIC
56	/* Setup the GOT */
57	ldr	r3, .Lgot
58	add	r3, pc, r3
59.L1:
60	ldr	r2, .Lcurbrk
61	ldr	r2, [r3, r2]
62#else
63	ldr	r2, .Lcurbrk
64#endif
65	/* Get the current brk address */
66	ldr	r1, [r2]
67
68	/* Calculate new value */
69	mov	r3, r0
70	add	r0, r0, r1
71	SYSTRAP(break)
72	bcs	PIC_SYM(CERROR, PLT)
73
74	/* Store new curbrk value */
75	ldr	r0, [r2]
76	add	r1, r0, r3
77	str	r1, [r2]
78
79	/* Return old curbrk value */
80	RET
81
82	.align	0
83#ifdef PIC
84.Lgot:
85	.word	_GLOBAL_OFFSET_TABLE_ - (.L1+4)
86#endif
87.Lcurbrk:
88	.word	PIC_SYM(CURBRK, GOT)
89