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 <stdio.h>
20#include <stdlib.h>
21#include <fcntl.h>
22#include <unistd.h>
23#include <sysdep.h>
24#include <fpu_control.h>
25#include <sys/param.h>
26#include <sys/types.h>
27#include <libc-internal.h>
28
29#include <ldsodefs.h>
30
31/* Set nonzero if we have to be prepared for more than one libc being
32 used in the process. Safe assumption if initializer never runs. */
33int __libc_multiple_libcs attribute_hidden = 1;
34
35/* Remember the command line argument and enviroment contents for
36 later calls of initializers for dynamic libraries. */
37int __libc_argc attribute_hidden;
38char **__libc_argv attribute_hidden;
39
40
41void
42__libc_init_first (int argc, char **argv, char **envp)
43{
44#ifdef SHARED
45 /* For DSOs we do not need __libc_init_first but an ELF constructor. */
46}
47
48static void __attribute__ ((constructor))
49_init_first (int argc, char **argv, char **envp)
50{
51#endif
52
53 __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
54
55 /* Make sure we don't initialize twice. */
56 if (!__libc_multiple_libcs)
57 {
58 /* Set the FPU control word to the proper default value if the
59 kernel would use a different value. */
60 if (__fpu_control != GLRO(dl_fpu_control))
61 __setfpucw (__fpu_control);
62 }
63
64 /* Save the command-line arguments. */
65 __libc_argc = argc;
66 __libc_argv = argv;
67 __environ = envp;
68
69#ifndef SHARED
70 /* First the initialization which normally would be done by the
71 dynamic linker. */
72 _dl_non_dynamic_init ();
73#endif
74
75 __init_misc (argc, argv, envp);
76}
77
78/* This function is defined here so that if this file ever gets into
79 ld.so we will get a link error. Having this file silently included
80 in ld.so causes disaster, because the _init_first definition above
81 will cause ld.so to gain an ELF constructor, which is not a cool
82 thing. */
83
84extern void _dl_start (void) __attribute__ ((noreturn));
85
86void
87_dl_start (void)
88{
89 abort ();
90}
91