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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* $OpenBSD: SYS.h,v 1.8 2000/01/06 10:49:20 d Exp $
*/
#include <machine/asm.h>
#include <sys/syscall.h>
/*
* Design note:
*
* System calls entry points are really named _thread_sys_{syscall},
* and weakly aliased to the name {syscall}. This allows the thread
* library to replace system calls at link time.
*/
#ifdef _NO_WEAK_ALIASES
#ifdef _THREAD_SAFE
/* Use _thread_sys_{syscall} when compiled with -D_THREAD_SAFE */
#ifdef __STDC__
#define SYSENTRY(x) ENTRY(_thread_sys_ ## x)
#else /* ! __STDC__ */
#define SYSENTRY(x) ENTRY(_thread_sys_/**/x)
#endif /* ! __STDC__ */
#else /* ! _THREAD_SAFE */
/* Use {syscall} when compiling without -D_THREAD_SAFE */
#define SYSENTRY(x) ENTRY(x)
#endif /* ! _THREAD_SAFE */
#else /* WEAK_ALIASES */
/* Use both _thread_sys_{syscall} and [weak] {syscall}. */
#ifdef __STDC__
#define SYSENTRY(x) \
ENTRY(_thread_sys_ ## x) \
.weak _C_LABEL(x); \
_C_LABEL(x) = _C_LABEL(_thread_sys_ ## x)
#else /* ! __STDC__ */
#define SYSENTRY(x) \
ENTRY(_thread_sys_/**/x) \
.weak _C_LABEL(x); \
_C_LABEL(x) = _C_LABEL(_thread_sys_/**/x)
#endif /* ! __STDC__ */
#endif /* WEAK_ALIASES */
#ifdef __STDC__
#define __DO_SYSCALL(x) \
movl $(SYS_ ## x),%eax; \
int $0x80
#else /* ! __STDC__ */
#define __DO_SYSCALL(x) \
movl $(SYS_/**/x),%eax; \
int $0x80
#endif /* ! __STDC__ */
/* perform a syscall, set errno */
#define SYSCALL(x) \
.text; \
.align 2; \
2: \
jmp PIC_PLT(cerror); \
SYSENTRY(x); \
__DO_SYSCALL(x); \
jc 2b
/* perform a syscall, set errno, return */
#define RSYSCALL(x) \
SYSCALL(x); \
ret
/* perform a syscall, return */
#define PSEUDO(x,y) \
SYSENTRY(x); \
__DO_SYSCALL(y); \
ret
.globl cerror
|
