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. */ |
34 | int __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. */ |
38 | int __libc_argc attribute_hidden; |
39 | char **__libc_argv attribute_hidden; |
40 | |
41 | |
42 | void |
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 | |
49 | void |
50 | attribute_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 | |
92 | extern void _dl_start (void) __attribute__ ((noreturn)); |
93 | |
94 | void |
95 | _dl_start (void) |
96 | { |
97 | abort (); |
98 | } |
99 | |