1 /* Initialization code run first thing by the ELF startup code. Common version
2 Copyright (C) 1995-2022 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 /* Remember the command line argument and enviroment contents for
32 later calls of initializers for dynamic libraries. */
33 int __libc_argc attribute_hidden;
34 char **__libc_argv attribute_hidden;
35
36
37 void
__libc_init_first(int argc,char ** argv,char ** envp)38 __libc_init_first (int argc, char **argv, char **envp)
39 {
40 #ifdef SHARED
41 /* For DSOs we do not need __libc_init_first but an ELF constructor. */
42 }
43
44 static void __attribute__ ((constructor))
_init_first(int argc,char ** argv,char ** envp)45 _init_first (int argc, char **argv, char **envp)
46 {
47 #endif
48
49 /* Make sure we don't initialize twice. */
50 #ifdef SHARED
51 if (__libc_initial)
52 {
53 /* Set the FPU control word to the proper default value if the
54 kernel would use a different value. */
55 if (__fpu_control != GLRO(dl_fpu_control))
56 __setfpucw (__fpu_control);
57 }
58 #endif
59
60 /* Save the command-line arguments. */
61 __libc_argc = argc;
62 __libc_argv = argv;
63 __environ = envp;
64
65 #ifndef SHARED
66 /* First the initialization which normally would be done by the
67 dynamic linker. */
68 _dl_non_dynamic_init ();
69 #endif
70
71 __init_misc (argc, argv, envp);
72 }
73
74 /* This function is defined here so that if this file ever gets into
75 ld.so we will get a link error. Having this file silently included
76 in ld.so causes disaster, because the _init_first definition above
77 will cause ld.so to gain an ELF constructor, which is not a cool
78 thing. */
79
80 extern void _dl_start (void) __attribute__ ((noreturn));
81
82 void
_dl_start(void)83 _dl_start (void)
84 {
85 abort ();
86 }
87