1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
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 * 4. 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
33#if defined(SYSLIBC_SCCS) && !defined(lint)
34	.asciz "@(#)brk.s	5.2 (Berkeley) 12/17/90"
35#endif /* SYSLIBC_SCCS and not lint */
36#include <machine/asm.h>
37__FBSDID("$FreeBSD$");
38
39#include "SYS.h"
40
41	.globl	HIDENAME(curbrk)
42	.globl	HIDENAME(minbrk)
43ENTRY(_brk)
44	jmp	ok
45END(_brk)
46
47ENTRY(brk)
48#ifdef PIC
49	movl	4(%esp),%eax
50	PIC_PROLOGUE
51	movl	PIC_GOT(HIDENAME(curbrk)),%edx	# set up GOT addressing
52	movl	PIC_GOT(HIDENAME(minbrk)),%ecx	#
53	PIC_EPILOGUE
54	cmpl	%eax,(%ecx)
55	jbe	ok
56	movl	(%ecx),%eax
57	movl	%eax,4(%esp)
58ok:
59	mov	$SYS_break,%eax
60	KERNCALL
61	jb	HIDENAME(cerror)
62	movl	4(%esp),%eax
63	movl	%eax,(%edx)
64	movl	$0,%eax
65	ret
66
67#else
68
69	movl	4(%esp),%eax
70	cmpl	%eax,HIDENAME(minbrk)
71	jbe	ok
72	movl	HIDENAME(minbrk),%eax
73	movl	%eax,4(%esp)
74ok:
75	mov	$SYS_break,%eax
76	KERNCALL
77	jb	HIDENAME(cerror)
78	movl	4(%esp),%eax
79	movl	%eax,HIDENAME(curbrk)
80	movl	$0,%eax
81	ret
82#endif
83END(brk)
84
85	.section .note.GNU-stack,"",%progbits
86