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.
4
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.
9
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.
14
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/>. */
18
19#include <ctype.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <fcntl.h>
23#include <unistd.h>
24#include <sysdep.h>
25#include <fpu_control.h>
26#include <sys/param.h>
27#include <sys/types.h>
28#include <libc-internal.h>
29
30#include <ldsodefs.h>
31
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. */
34int __libc_multiple_libcs attribute_hidden = 1;
35
36/* Remember the command line argument and enviroment contents for
37 later calls of initializers for dynamic libraries. */
38int __libc_argc attribute_hidden;
39char **__libc_argv attribute_hidden;
40
41
42void
43__libc_init_first (int argc, char **argv, char **envp)
44{
45#ifdef SHARED
46 /* For DSOs we do not need __libc_init_first but instead _init. */
47}
48
49void
50attribute_hidden
51_init (int argc, char **argv, char **envp)
52{
53#endif
54
55 __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
56
57 /* Make sure we don't initialize twice. */
58 if (!__libc_multiple_libcs)
59 {
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);
64 }
65
66 /* Save the command-line arguments. */
67 __libc_argc = argc;
68 __libc_argv = argv;
69 __environ = envp;
70
71#ifndef SHARED
72 /* First the initialization which normally would be done by the
73 dynamic linker. */
74 _dl_non_dynamic_init ();
75#endif
76
77 __init_misc (argc, argv, envp);
78
79 /* Initialize ctype data. */
80 __ctype_init ();
81
82#if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS
83 __libc_global_ctors ();
84#endif
85}
86
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. */
91
92extern void _dl_start (void) __attribute__ ((noreturn));
93
94void
95_dl_start (void)
96{
97 abort ();
98}
99