1/*	$NetBSD: brk.S,v 1.10 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: @(#)brk.s	5.2 (Berkeley) 12/17/90
35 */
36
37#include <machine/asm.h>
38#if defined(SYSLIBC_SCCS) && !defined(lint)
39	RCSID("$NetBSD: brk.S,v 1.10 2006/01/06 03:58:31 uwe Exp $")
40#endif /* SYSLIBC_SCCS and not lint */
41
42#include "SYS.h"
43
44#ifdef WEAK_ALIAS
45WEAK_ALIAS(brk,_brk)
46#endif
47
48	.data
49	.globl	_C_LABEL(__minbrk)
50	.align	2
51_C_LABEL(__minbrk):
52	.long	_end
53
54	.text
55
56ENTRY(_brk)
57#ifdef __PIC__
58	mova	L_GOT, r0
59	mov.l	L_GOT, r2
60	add	r0, r2
61	mov.l	Lminbrk, r0
62	mov.l	@(r0, r2), r0
63	mov.l	@r0, r0
64#else
65	mov.l	Lminbrk, r0
66	mov.l	@r0, r0
67#endif
68	cmp/hs	r4, r0
69	bf	1f
70	mov	r0, r4
711:
72	mov.l	LSYS_break, r0
73	trapa	#0x80
74	bf	err
75#ifdef __PIC__
76	mov.l	Lcurbrk, r0
77	mov.l	@(r0, r2), r1
78	xor	r0, r0
79#else
80	xor	r0, r0
81	mov.l	Lcurbrk, r1
82#endif
83	rts
84	mov.l	r4, @r1
85err:
86	JUMP_CERROR
87
88	.align	2
89LSYS_break:	.long	SYS_break
90#ifdef __PIC__
91L_GOT:		.long	_GLOBAL_OFFSET_TABLE_
92Lminbrk:	.long	_C_LABEL(__minbrk)@GOT
93Lcurbrk:	.long	curbrk@GOT
94#else
95Lminbrk:	.long	_C_LABEL(__minbrk)
96Lcurbrk:	.long	curbrk
97#endif
98	SET_ENTRY_SIZE(_brk)
99