1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(SYSLIBC_SCCS)
.text
.asciz "$OpenBSD: brk.S,v 1.5 2003/12/25 18:49:07 miod Exp $"
#endif /* SYSLIBC_SCCS */
#include "SYS.h"
.globl __curbrk
.globl minbrk
.data
minbrk: .long _end ! lower brk limit; also for gmon code
.text
#ifdef PIC
ENTRY(brk)
PIC_PROLOGUE(%o5,%o4)
ld [%o5 + minbrk], %o4
ld [%o4], %o1 ! %o1 = minbrk
cmp %o1, %o0 ! if (minbrk > %o0)
bgu,a 0f
mov %o1, %o0 ! %o0 = minbrk
0:
mov %o0, %o2 ! save argument to syscall
mov SYS_break, %g1
t ST_SYSCALL
bcc,a 1f
ld [%o5 + __curbrk], %o4
ERROR()
1:
retl ! success, return 0 & record new break
st %o2, [%o4]
#else
ENTRY(brk)
sethi %hi(minbrk), %o1 ! %o1 = minbrk
ld [%o1 + %lo(minbrk)], %o1
cmp %o1, %o0 ! if (minbrk > %o0)
bgu,a 0f
mov %o1, %o0 ! %o0 = minbrk
0:
mov %o0, %o2 ! save argument to syscall
mov SYS_break, %g1
t ST_SYSCALL
bcc,a 1f
sethi %hi(__curbrk), %g1
ERROR()
1:
retl ! success, return 0 & record new break
st %o2, [%g1 + %lo(__curbrk)]
#endif
|
