1/*	$NetBSD: brk.S,v 1.16 2003/08/07 16:42:17 agc Exp $	*/
2
3/*-
4 * Copyright (c) 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ralph Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <machine/asm.h>
36__FBSDID("$FreeBSD$");
37#include "SYS.h"
38
39#if defined(LIBC_SCCS) && !defined(lint)
40	ASMSTR("from: @(#)brk.s	8.1 (Berkeley) 6/4/93")
41	ASMSTR("$NetBSD: brk.S,v 1.16 2003/08/07 16:42:17 agc Exp $")
42#endif /* LIBC_SCCS and not lint */
43
44	.globl	_C_LABEL(minbrk)
45	.globl	_C_LABEL(__curbrk)
46	.globl	_C_LABEL(_end)
47
48	.data
49_C_LABEL(minbrk):
50	PTR_WORD	_C_LABEL(_end)
51
52	.text
53LEAF(__sys_brk)
54	WEAK_ALIAS(brk, __sys_brk)
55	WEAK_ALIAS(_brk, __sys_brk)
56	PIC_PROLOGUE(__sys_brk)
57	PTR_LA	v0, _C_LABEL(minbrk)
58	PTR_L	v0, 0(v0)
59	bgeu	a0, v0, 1f
60	move	a0, v0		# dont allow break < minbrk
611:
62	li	v0, SYS_break
63	syscall
64	bne	a3, zero, 2f
65	PTR_LA	t0, _C_LABEL(__curbrk)
66	PTR_S	a0, 0(t0)
67	move	v0, zero
68	PIC_RETURN()
692:
70	PIC_TAILCALL(__cerror)
71END(__sys_brk)
72