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
152
153
|
/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
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/>. */
#include <sysdep.h>
#include <tls.h>
#ifndef __ASSEMBLER__
# include <nptl/pthreadP.h>
#endif
#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
# undef PSEUDO
# define PSEUDO(name, syscall_name, args) \
.text; \
ENTRY (name) \
cmpl $0, %gs:MULTIPLE_THREADS_OFFSET; \
jne L(pseudo_cancel); \
.type __##syscall_name##_nocancel,@function; \
.globl __##syscall_name##_nocancel; \
__##syscall_name##_nocancel: \
DO_CALL (syscall_name, args); \
cmpl $-4095, %eax; \
jae SYSCALL_ERROR_LABEL; \
ret; \
.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
L(pseudo_cancel): \
CENABLE \
SAVE_OLDTYPE_##args \
PUSHCARGS_##args \
DOCARGS_##args \
movl $SYS_ify (syscall_name), %eax; \
ENTER_KERNEL; \
POPCARGS_##args; \
POPSTATE_##args \
cmpl $-4095, %eax; \
jae SYSCALL_ERROR_LABEL
# define SAVE_OLDTYPE_0 movl %eax, %ecx;
# define SAVE_OLDTYPE_1 SAVE_OLDTYPE_0
# define SAVE_OLDTYPE_2 pushl %eax; cfi_adjust_cfa_offset (4);
# define SAVE_OLDTYPE_3 SAVE_OLDTYPE_2
# define SAVE_OLDTYPE_4 SAVE_OLDTYPE_2
# define SAVE_OLDTYPE_5 SAVE_OLDTYPE_2
# define SAVE_OLDTYPE_6 SAVE_OLDTYPE_2
# define PUSHCARGS_0 /* No arguments to push. */
# define DOCARGS_0 /* No arguments to frob. */
# define POPCARGS_0 /* No arguments to pop. */
# define _PUSHCARGS_0 /* No arguments to push. */
# define _POPCARGS_0 /* No arguments to pop. */
# define PUSHCARGS_1 movl %ebx, %edx; cfi_register (ebx, edx); PUSHCARGS_0
# define DOCARGS_1 _DOARGS_1 (4)
# define POPCARGS_1 POPCARGS_0; movl %edx, %ebx; cfi_restore (ebx);
# define _PUSHCARGS_1 pushl %ebx; cfi_adjust_cfa_offset (4); \
cfi_rel_offset (ebx, 0); _PUSHCARGS_0
# define _POPCARGS_1 _POPCARGS_0; popl %ebx; \
cfi_adjust_cfa_offset (-4); cfi_restore (ebx);
# define PUSHCARGS_2 PUSHCARGS_1
# define DOCARGS_2 _DOARGS_2 (12)
# define POPCARGS_2 POPCARGS_1
# define _PUSHCARGS_2 _PUSHCARGS_1
# define _POPCARGS_2 _POPCARGS_1
# define PUSHCARGS_3 _PUSHCARGS_2
# define DOCARGS_3 _DOARGS_3 (20)
# define POPCARGS_3 _POPCARGS_3
# define _PUSHCARGS_3 _PUSHCARGS_2
# define _POPCARGS_3 _POPCARGS_2
# define PUSHCARGS_4 _PUSHCARGS_4
# define DOCARGS_4 _DOARGS_4 (28)
# define POPCARGS_4 _POPCARGS_4
# define _PUSHCARGS_4 pushl %esi; cfi_adjust_cfa_offset (4); \
cfi_rel_offset (esi, 0); _PUSHCARGS_3
# define _POPCARGS_4 _POPCARGS_3; popl %esi; \
cfi_adjust_cfa_offset (-4); cfi_restore (esi);
# define PUSHCARGS_5 _PUSHCARGS_5
# define DOCARGS_5 _DOARGS_5 (36)
# define POPCARGS_5 _POPCARGS_5
# define _PUSHCARGS_5 pushl %edi; cfi_adjust_cfa_offset (4); \
cfi_rel_offset (edi, 0); _PUSHCARGS_4
# define _POPCARGS_5 _POPCARGS_4; popl %edi; \
cfi_adjust_cfa_offset (-4); cfi_restore (edi);
# define PUSHCARGS_6 _PUSHCARGS_6
# define DOCARGS_6 _DOARGS_6 (44)
# define POPCARGS_6 _POPCARGS_6
# define _PUSHCARGS_6 pushl %ebp; cfi_adjust_cfa_offset (4); \
cfi_rel_offset (ebp, 0); _PUSHCARGS_5
# define _POPCARGS_6 _POPCARGS_5; popl %ebp; \
cfi_adjust_cfa_offset (-4); cfi_restore (ebp);
# if IS_IN (libpthread)
# define CENABLE call __pthread_enable_asynccancel;
# define CDISABLE call __pthread_disable_asynccancel
# elif IS_IN (libc)
# define CENABLE call __libc_enable_asynccancel;
# define CDISABLE call __libc_disable_asynccancel
# elif IS_IN (librt)
# define CENABLE call __librt_enable_asynccancel;
# define CDISABLE call __librt_disable_asynccancel
# else
# error Unsupported library
# endif
# define POPSTATE_0 \
pushl %eax; cfi_adjust_cfa_offset (4); movl %ecx, %eax; \
CDISABLE; popl %eax; cfi_adjust_cfa_offset (-4);
# define POPSTATE_1 POPSTATE_0
# define POPSTATE_2 xchgl (%esp), %eax; CDISABLE; popl %eax; \
cfi_adjust_cfa_offset (-4);
# define POPSTATE_3 POPSTATE_2
# define POPSTATE_4 POPSTATE_3
# define POPSTATE_5 POPSTATE_4
# define POPSTATE_6 POPSTATE_5
# ifndef __ASSEMBLER__
# define SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
# else
# define SINGLE_THREAD_P cmpl $0, %gs:MULTIPLE_THREADS_OFFSET
# endif
#elif !defined __ASSEMBLER__
# define SINGLE_THREAD_P (1)
# define NO_CANCELLATION 1
#endif
#ifndef __ASSEMBLER__
# define RTLD_SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
#endif
|
GitWeb