1/*	$NetBSD: brk.S,v 1.6 2003/08/07 16:42:04 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: @(#)brk.s	5.2 (Berkeley) 12/17/90
32 */
33
34#include <machine/asm.h>
35__FBSDID("$FreeBSD$");
36#include "SYS.h"
37
38	.globl	_C_LABEL(_end)
39	.globl	CURBRK
40
41#ifdef WEAK_ALIAS
42WEAK_ALIAS(brk, _brk)
43#endif
44
45	.data
46	.align	0
47	.globl	_C_LABEL(minbrk)
48	.type	_C_LABEL(minbrk),#object
49_C_LABEL(minbrk):
50	.word	_C_LABEL(_end)
51
52/*
53 * Change the data segment size
54 */
55ENTRY(_brk)
56	/* Setup the GOT */
57	GOT_INIT(r3, .Lgot, .L1)
58	GOT_GET(r1, r3, .Lminbrk)
59
60	/* Get the minimum allowable brk address */
61	ldr	r1, [r1]
62
63	/*
64	 * Valid the address specified and set to the minimum
65	 * if the address is below minbrk.
66	 */
67	cmp	r0, r1
68	it	lt
69	movlt	r0, r1
70	mov	r2, r0
71	SYSTRAP(break)
72	bcs	PIC_SYM(CERROR, PLT)
73
74#ifdef PIC
75	ldr	r1, .Lcurbrk
76	ldr	r1, [r3, r1]
77#else
78	ldr	r1, .Lcurbrk
79#endif
80	/* Store the new address in curbrk */
81	str	r2, [r1]
82
83	/* Return 0 for success */
84	mov	r0, #0x00000000
85	RET
86
87	.align	2
88	GOT_INITSYM(.Lgot, .L1)
89.Lminbrk:
90	.word	PIC_SYM(_C_LABEL(minbrk), GOT)
91.Lcurbrk:
92	.word	PIC_SYM(CURBRK, GOT)
93END(_brk)
94
95	.section .note.GNU-stack,"",%progbits
96