1/*	$OpenBSD: sbrk.S,v 1.13 2022/12/08 01:25:43 guenther Exp $	*/
2/*	$NetBSD: sbrk.S,v 1.7 2003/08/07 16:42:05 agc Exp $	*/
3
4/*-
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	from: @(#)sbrk.s	5.1 (Berkeley) 4/23/90
33 */
34
35#include "SYS.h"
36
37	.globl	_end
38
39	.data
40	.align	2
41	.globl	__curbrk
42	.type	__curbrk,#object
43	.hidden	__curbrk
44__curbrk:
45	.word	_end
46	END(__curbrk)
47
48/*
49 * Change the data segment size
50 */
51ENTRY_NB(sbrk)
52#ifdef __PIC__
53	/* Setup the GOT */
54	ldr	r3, .Lgot
55	ldr	r2, .Lcurbrk
56.L1:
57	add	r3, pc, r3
58	ldr	r2, [r3, r2]
59#else
60	ldr	r2, .Lcurbrk
61#endif
62	/* Get the current brk address */
63	ldr	r1, [r2]
64
65	/* Calculate new value */
66	mov	r3, r0
67	add	r0, r0, r1
68	SYSTRAP(break)
69	bcs	CERROR
70
71	/* Store new curbrk value */
72	ldr	r0, [r2]
73	add	r1, r0, r3
74	str	r1, [r2]
75
76	/* Return old curbrk value */
77	mov	r15, r14
78
79	.align	2
80#ifdef __PIC__
81.Lgot:
82	.word	_GLOBAL_OFFSET_TABLE_ - (.L1+8)
83#endif
84.Lcurbrk:
85	.word	PIC_SYM(__curbrk, GOT)
86END(sbrk)
87	.weak	sbrk
88