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
147
148
149
150
151
|
/* Copyright (C) 2011-2018 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef _BITS_SYSCALLS_H
#define _BITS_SYSCALLS_H
#ifndef _SYSCALL_H
# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
#endif
/* Define a macro which expands inline into the wrapper code for a system
call. */
# undef INLINE_SYSCALL
# define INLINE_SYSCALL(name, nr, args...) \
({ \
INTERNAL_SYSCALL_DECL (_sc_err); \
unsigned long _sc_val = INTERNAL_SYSCALL (name, _sc_err, nr, args); \
if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sc_val, _sc_err), 0)) \
{ \
__set_errno (INTERNAL_SYSCALL_ERRNO (_sc_val, _sc_err)); \
_sc_val = -1; \
} \
(long) _sc_val; \
})
#undef INTERNAL_SYSCALL
#define INTERNAL_SYSCALL(name, err, nr, args...) \
internal_syscall##nr (SYS_ify (name), err, args)
#undef INTERNAL_SYSCALL_NCS
#define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \
internal_syscall##nr (number, err, args)
#undef INTERNAL_SYSCALL_DECL
#define INTERNAL_SYSCALL_DECL(err) int err
#undef INTERNAL_SYSCALL_ERROR_P
#define INTERNAL_SYSCALL_ERROR_P(val, err) ({ (void) (val); (err) != 0; })
#undef INTERNAL_SYSCALL_ERRNO
#define INTERNAL_SYSCALL_ERRNO(val, err) ({ (void) (val); (err); })
#define internal_syscall0(num, err, dummy...) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall1(num, err, arg0) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall2(num, err, arg0, arg1) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0), "R01" (arg1) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall3(num, err, arg0, arg1, arg2) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall4(num, err, arg0, arg1, arg2, arg3) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2), \
"R03" (arg3) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall5(num, err, arg0, arg1, arg2, arg3, arg4) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2), \
"R03" (arg3), "R04" (arg4) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#define internal_syscall6(num, err, arg0, arg1, arg2, arg3, arg4, arg5) \
({ \
long _sys_result, __SYSCALL_CLOBBER_DECLS; \
__asm__ __volatile__ ( \
"swint1" \
: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2), \
"R03" (arg3), "R04" (arg4), "R05" (arg5) \
: __SYSCALL_CLOBBERS); \
_sys_result; \
})
#undef __SYSCALL_CLOBBERS
#define __SYSCALL_CLOBBERS \
"r6", "r7", \
"r8", "r9", "r11", "r12", "r13", "r14", "r15", \
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
"r24", "r25", "r26", "r27", "r28", "r29", "memory"
/* gcc doesn't seem to allow an input operand to be clobbered, so we
fake it with dummy outputs. */
#define __SYSCALL_CLOBBER_DECLS \
_clobber_r2, _clobber_r3, _clobber_r4, _clobber_r5, _clobber_r10
#define __SYSCALL_CLOBBER_OUTPUTS \
"=R02" (_clobber_r2), "=R03" (_clobber_r3), "=R04" (_clobber_r4), \
"=R05" (_clobber_r5), "=R10" (_clobber_r10)
#endif
|
