1/*	$NetBSD: sbrk.S,v 1.9 2006/01/06 03:58:31 uwe Exp $	*/
2
3/*-
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
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 *	from: @(#)sbrk.s	5.1 (Berkeley) 4/23/90
35 */
36
37#include <machine/asm.h>
38#if defined(SYSLIBC_SCCS) && !defined(lint)
39	RCSID("$NetBSD: sbrk.S,v 1.9 2006/01/06 03:58:31 uwe Exp $")
40#endif /* SYSLIBC_SCCS and not lint */
41
42#include "SYS.h"
43
44	.globl	_end
45	.globl	curbrk
46
47#ifdef WEAK_ALIAS
48WEAK_ALIAS(sbrk,_sbrk)
49#endif
50
51	.data
52curbrk:	.long	_end
53	.text
54
55ENTRY(_sbrk)
56	mov	r4, r2
57#ifdef __PIC__
58	mova	L_GOT, r0
59	mov.l	L_GOT, r3
60	add	r0, r3
61	mov.l	Lcurbrk, r0
62	mov.l	@(r0, r3), r0
63#else
64	mov.l	Lcurbrk, r0
65#endif
66	mov.l	@r0, r0
67	add	r0, r4
68	mov.l	LSYS_break, r0
69	trapa	#0x80
70	bf	err
71#ifdef __PIC__
72	mov.l	Lcurbrk, r0
73	mov.l	@(r0, r3), r1
74#else
75	mov.l	Lcurbrk, r1
76#endif
77	mov.l	@r1, r0
78	add	r0, r2
79	rts
80	mov.l	r2, @r1
81err:
82	JUMP_CERROR
83
84	.align	2
85LSYS_break:	.long	SYS_break
86#ifdef __PIC__
87L_GOT:		.long	_GLOBAL_OFFSET_TABLE_
88Lcurbrk:	.long	curbrk@GOT
89#else
90Lcurbrk:	.long	curbrk
91#endif
92	SET_ENTRY_SIZE(_sbrk)
93