1 /* Initialization code run first thing by the ELF startup code. Common version
2 Copyright (C) 1995-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
25 #include <fpu_control.h>
26 #include <sys/param.h>
27 #include <sys/types.h>
28 #include <libc-internal.h>
32 /* Set nonzero if we have to be prepared for more than one libc being
33 used in the process. Safe assumption if initializer never runs. */
34 int __libc_multiple_libcs attribute_hidden
= 1;
36 /* Remember the command line argument and enviroment contents for
37 later calls of initializers for dynamic libraries. */
38 int __libc_argc attribute_hidden
;
39 char **__libc_argv attribute_hidden
;
43 __libc_init_first (int argc
, char **argv
, char **envp
)
46 /* For DSOs we do not need __libc_init_first but instead _init. */
51 _init (int argc
, char **argv
, char **envp
)
55 __libc_multiple_libcs
= &_dl_starting_up
&& !_dl_starting_up
;
57 /* Make sure we don't initialize twice. */
58 if (!__libc_multiple_libcs
)
60 /* Set the FPU control word to the proper default value if the
61 kernel would use a different value. */
62 if (__fpu_control
!= GLRO(dl_fpu_control
))
63 __setfpucw (__fpu_control
);
66 /* Save the command-line arguments. */
72 /* First the initialization which normally would be done by the
74 _dl_non_dynamic_init ();
77 __init_misc (argc
, argv
, envp
);
79 /* Initialize ctype data. */
82 #if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS
83 __libc_global_ctors ();
87 /* This function is defined here so that if this file ever gets into
88 ld.so we will get a link error. Having this file silently included
89 in ld.so causes disaster, because the _init definition above will
90 cause ld.so to gain an init function, which is not a cool thing. */
92 extern void _dl_start (void) __attribute__ ((noreturn
));