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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/* Copyright (C) 1998,1999,2000,2001,2002,2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <ldsodefs.h>
#include <bp-start.h>
#include <bp-sym.h>
extern void __libc_init_first (int argc, char **argv, char **envp);
extern int __libc_multiple_libcs;
extern void *__libc_stack_end;
#include <tls.h>
#ifndef SHARED
# include <dl-osinfo.h>
extern void __pthread_initialize_minimal (void)
# if !(USE_TLS - 0) && !defined NONTLS_INIT_TP
__attribute__ ((weak))
# endif
;
#endif
#ifdef HAVE_PTR_NTHREADS
/* We need atomic operations. */
# include <atomic.h>
#endif
#ifdef LIBC_START_MAIN
# define STATIC static inline
#else
# define STATIC
# define LIBC_START_MAIN BP_SYM (__libc_start_main)
#endif
STATIC int LIBC_START_MAIN (int (*main) (int, char **, char **
#ifdef MAIN_AUXVEC_ARG
, void *
#endif
),
int argc,
char *__unbounded *__unbounded ubp_av,
#ifdef LIBC_START_MAIN_AUXVEC_ARG
ElfW(auxv_t) *__unbounded auxvec,
#endif
#ifdef INIT_MAIN_ARGS
__typeof (main) init,
#else
void (*init) (void),
#endif
void (*fini) (void),
void (*rtld_fini) (void),
void *__unbounded stack_end)
__attribute__ ((noreturn));
STATIC int
LIBC_START_MAIN (int (*main) (int, char **, char **
#ifdef MAIN_AUXVEC_ARG
, void *
#endif
),
int argc, char *__unbounded *__unbounded ubp_av,
#ifdef LIBC_START_MAIN_AUXVEC_ARG
ElfW(auxv_t) *__unbounded auxvec,
#endif
#ifdef INIT_MAIN_ARGS
__typeof (main) init,
#else
void (*init) (void),
#endif
void (*fini) (void),
void (*rtld_fini) (void), void *__unbounded stack_end)
{
char *__unbounded *__unbounded ubp_ev = &ubp_av[argc + 1];
#if __BOUNDED_POINTERS__
char **argv;
#else
# define argv ubp_av
#endif
/* Result of the 'main' function. */
int result;
__libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
INIT_ARGV_and_ENVIRON;
/* Store the lowest stack address. */
__libc_stack_end = stack_end;
#ifndef SHARED
# ifdef HAVE_AUX_VECTOR
/* First process the auxiliary vector since we need to find the
program header to locate an eventually present PT_TLS entry. */
# ifndef LIBC_START_MAIN_AUXVEC_ARG
ElfW(auxv_t) *__unbounded auxvec;
{
char *__unbounded *__unbounded evp = ubp_ev;
while (*evp++ != NULL)
;
auxvec = (ElfW(auxv_t) *__unbounded) evp;
}
# endif
_dl_aux_init (auxvec);
# endif
# ifdef DL_SYSDEP_OSCHECK
if (!__libc_multiple_libcs)
{
/* This needs to run to initiliaze _dl_osversion before TLS
setup might check it. */
DL_SYSDEP_OSCHECK (__libc_fatal);
}
# endif
/* Initialize the thread library at least a bit since the libgcc
functions are using thread functions if these are available and
we need to setup errno. If there is no thread library and we
handle TLS the function is defined in the libc to initialized the
TLS handling. */
# if !(USE_TLS - 0) && !defined NONTLS_INIT_TP
if (__pthread_initialize_minimal)
# endif
__pthread_initialize_minimal ();
/* Some security at this point. Prevent starting a SUID binary where
the standard file descriptors are not opened. We have to do this
only for statically linked applications since otherwise the dynamic
loader did the work already. */
if (__builtin_expect (__libc_enable_secure, 0))
__libc_check_standard_fds ();
#endif
/* Register the destructor of the dynamic linker if there is any. */
if (__builtin_expect (rtld_fini != NULL, 1))
__cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL);
/* Call the initializer of the libc. This is only needed here if we
are compiling for the static library in which case we haven't
run the constructors in `_dl_start_user'. */
#ifndef SHARED
__libc_init_first (argc, argv, __environ);
#endif
/* Register the destructor of the program, if any. */
if (fini)
__cxa_atexit ((void (*) (void *)) fini, NULL, NULL);
/* Call the initializer of the program, if any. */
#ifdef SHARED
if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
_dl_debug_printf ("\ninitialize program: %s\n\n", argv[0]);
#endif
if (init)
(*init) (
#ifdef INIT_MAIN_ARGS
argc, argv, __environ
# ifdef MAIN_AUXVEC_ARG
, auxvec
# endif
#endif
);
#ifdef SHARED
if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
_dl_debug_printf ("\ntransferring control: %s\n\n", argv[0]);
#endif
#ifdef HAVE_CANCELBUF
if (setjmp (THREAD_SELF->cancelbuf) == 0)
#endif
{
/* XXX This is where the try/finally handling must be used. */
result = main (argc, argv, __environ
#ifdef MAIN_AUXVEC_ARG
, auxvec
#endif
);
}
#ifdef HAVE_CANCELBUF
else
{
# ifdef HAVE_PTR_NTHREADS
/* One less thread. Decrement the counter. If it is zero we
terminate the entire process. */
result = 0;
# ifdef SHARED
int *const ptr = __libc_pthread_functions.ptr_nthreads;
# else
extern int __nptl_nthreads __attribute ((weak));
int *const ptr = &__nptl_nthreads;
# endif
if (! atomic_decrement_and_test (ptr))
# endif
/* Not much left to do but to exit the thread, not the process. */
__exit_thread (0);
}
#endif
exit (result);
}
|
