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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/* $OpenBSD: SYS.h,v 1.15 2016/05/16 16:25:06 guenther Exp $ */
/* $NetBSD: SYS.h,v 1.4 1996/10/17 03:03:53 cgd Exp $ */
/*
* Copyright (c) 1994, 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <machine/asm.h>
#include <machine/pal.h> /* for PAL_rdunique */
#include <sys/syscall.h>
/* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */
#define TCB_OFFSET_ERRNO (-12)
/*
* We define a hidden alias with the prefix "_libc_" for each global symbol
* that may be used internally. By referencing _libc_x instead of x, other
* parts of libc prevent overriding by the application and avoid unnecessary
* relocations.
*/
#define _HIDDEN(x) _libc_##x
#define _HIDDEN_ALIAS(x,y) \
STRONG_ALIAS(_HIDDEN(x),y); \
.hidden _HIDDEN(x)
#define _HIDDEN_FALIAS(x,y) \
_HIDDEN_ALIAS(x,y); \
.type _HIDDEN(x),@function
/*
* END() uses the alpha .end pseudo-op which requires a matching .ent,
* so here's a short hand for just doing .size
*/
#define _END(x) .size x, . - x
/*
* For functions implemented in ASM that aren't syscalls.
* END_STRONG(x) Like DEF_STRONG() in C; for standard/reserved C names
* END_WEAK(x) Like DEF_WEAK() in C; for non-ISO C names
*/
#define END_STRONG(x) END(x); _HIDDEN_FALIAS(x,x); \
_END(_HIDDEN(x))
#define END_WEAK(x) END_STRONG(x); .weak x
#define CALLSYS_ERROR(name) \
CALLSYS_NOERROR(name); \
beq a3, LLABEL(name,1); \
mov v0, t0; \
call_pal PAL_rdunique; \
stl t0, TCB_OFFSET_ERRNO(v0); \
ldiq v0, -1; \
RET; \
LLABEL(name,1):
#define __LEAF(p,n,e) \
LEAF(___CONCAT(p,n),e)
#define __END(p,n) \
END(___CONCAT(p,n)); \
_HIDDEN_FALIAS(n,___CONCAT(p,n)); \
_END(_HIDDEN(n))
#define __SYSCALL(p,name) \
__LEAF(p,name,0); /* XXX # of args? */ \
CALLSYS_ERROR(name)
#define __SYSCALL_NOERROR(p,name) \
__LEAF(p,name,0); /* XXX # of args? */ \
CALLSYS_NOERROR(name)
#define __RSYSCALL(p,name) \
__SYSCALL(p,name); \
RET; \
__END(p,name)
#define __RSYSCALL_NOERROR(p,name) \
__SYSCALL_NOERROR(p,name); \
RET; \
__END(p,name)
#define __PSEUDO(p,label,name) \
__LEAF(p,label,0); /* XXX # of args? */ \
CALLSYS_ERROR(name); \
RET; \
__END(p,label);
#define __PSEUDO_NOERROR(p,label,name) \
__LEAF(p,label,0); /* XXX # of args? */ \
CALLSYS_NOERROR(name); \
RET; \
__END(p,label);
#define ALIAS(prefix,name) WEAK_ALIAS(name, ___CONCAT(prefix,name));
/*
* For the thread_safe versions, we prepend _thread_sys_ to the function
* name so that the 'C' wrapper can go around the real name.
*/
# define SYSCALL(x) ALIAS(_thread_sys_,x) \
__SYSCALL(_thread_sys_,x)
# define SYSCALL_NOERROR(x) ALIAS(_thread_sys_,x) \
__SYSCALL_NOERROR(_thread_sys_,x)
# define RSYSCALL(x) ALIAS(_thread_sys_,x) \
__RSYSCALL(_thread_sys_,x); \
_END(x)
# define RSYSCALL_HIDDEN(x) __RSYSCALL(_thread_sys_,x)
# define RSYSCALL_NOERROR(x) ALIAS(_thread_sys_,x) \
__RSYSCALL_NOERROR(_thread_sys_,x); \
_END(x)
# define PSEUDO(x,y) ALIAS(_thread_sys_,x) \
__PSEUDO(_thread_sys_,x,y); \
_END(x)
# define PSEUDO_NOERROR(x,y) ALIAS(_thread_sys_,x) \
__PSEUDO_NOERROR(_thread_sys_,x,y); \
_END(x)
# define SYSLEAF_HIDDEN(x,e) __LEAF(_thread_sys_,x,e)
# define SYSLEAF(x,e) ALIAS(_thread_sys_,x) \
SYSLEAF_HIDDEN(x,e)
# define SYSCALL_END_HIDDEN(x) __END(_thread_sys_,x)
# define SYSCALL_END(x) SYSCALL_END_HIDDEN(x); \
_END(x)
|
