1/*	$NetBSD: sbrk.S,v 1.11 2013/09/03 00:30:19 matt 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 "SYS.h"
35
36	.globl	_C_LABEL(_end)
37
38#ifdef WEAK_ALIAS
39WEAK_ALIAS(sbrk, _sbrk)
40#endif
41
42	.data
43	.align	0
44	.globl	_C_LABEL(__curbrk)
45	.hidden	_C_LABEL(__curbrk)
46	.type	_C_LABEL(__curbrk),#object
47_C_LABEL(__curbrk):
48	.word	_C_LABEL(_end)
49
50/*
51 * Change the data segment size
52 */
53ENTRY(_sbrk)
54	/* get address or offset to __curbrk */
55	ldr	r2, .Lcurbrk
56#ifdef __PIC__
57	add	r2, r2, pc	/* pc = &.LPIC0 */
58#endif
59
60	/* Get the current brk address */
61	ldr	r1, [r2]
62
63	/* Calculate new value */
64.LPIC0:	mov	r3, r0
65	adds	r0, r0, r1
66	SYSTRAP(break)
67	_INVOKE_CERROR()
68
69	/* Store new curbrk value */
70	ldr	r0, [r2]
71	adds	r1, r0, r3
72	str	r1, [r2]
73
74	/* Return old curbrk value */
75	RET
76
77	.align	0
78.Lcurbrk:
79	.word	REL_SYM(_C_LABEL(__curbrk), .LPIC0)
80END(_sbrk)
81