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2a072de4 | 1 | /* Initialization code run first thing by the ELF startup code. Linux version. |
7cc27f44 | 2 | Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc. |
c6645251 UD |
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 Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | 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 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
0324daa0 RM |
19 | |
20 | #include <unistd.h> | |
41cfadd6 | 21 | #include <sysdep.h> |
3776d592 | 22 | #include <fpu_control.h> |
23396375 | 23 | #include <linux/personality.h> |
a68b0d31 | 24 | #include <init-first.h> |
7cc27f44 | 25 | #include <sys/types.h> |
2a072de4 | 26 | |
0324daa0 RM |
27 | extern void __libc_init (int, char **, char **); |
28 | extern void __libc_global_ctors (void); | |
29 | ||
3776d592 | 30 | /* The function is called from assembly stubs the compiler can't see. */ |
57ba7bb4 | 31 | static void init (int, char **, char **) __attribute__ ((unused)); |
0324daa0 | 32 | |
39778c6c UD |
33 | extern int _dl_starting_up; |
34 | weak_extern (_dl_starting_up) | |
35 | ||
36 | /* Set nonzero if we have to be prepared for more then one libc being | |
37 | used in the process. Safe assumption if initializer never runs. */ | |
38 | int __libc_multiple_libcs = 1; | |
23396375 | 39 | |
dcf0671d UD |
40 | /* Remember the command line argument and enviroment contents for |
41 | later calls of initializers for dynamic libraries. */ | |
42 | int __libc_argc; | |
43 | char **__libc_argv; | |
dcf0671d | 44 | |
7cc27f44 UD |
45 | /* We often need the PID. Cache this value. */ |
46 | pid_t __libc_pid; | |
47 | ||
dcf0671d | 48 | |
0324daa0 | 49 | static void |
57ba7bb4 | 50 | init (int argc, char **argv, char **envp) |
0324daa0 | 51 | { |
8d71c7b0 | 52 | extern int __personality (int); |
7cc27f44 | 53 | extern void __getopt_clean_environment (void); |
8d71c7b0 | 54 | |
39778c6c UD |
55 | /* We must not call `personality' twice. */ |
56 | if (!__libc_multiple_libcs) | |
23396375 | 57 | { |
39778c6c UD |
58 | /* The `personality' system call takes one argument that chooses |
59 | the "personality", i.e. the set of system calls and such. We | |
60 | must make this call first thing to disable emulation of some | |
61 | other system that might have been enabled by default based on | |
62 | the executable format. */ | |
63 | __personality (PER_LINUX); | |
64 | ||
65 | /* Set the FPU control word to the proper default value. */ | |
66 | __setfpucw (__fpu_control); | |
23396375 | 67 | } |
0324daa0 | 68 | |
57ba7bb4 UD |
69 | /* Save the command-line arguments. */ |
70 | __libc_argc = argc; | |
71 | __libc_argv = argv; | |
72 | __environ = envp; | |
73 | ||
74 | __libc_init (argc, argv, envp); | |
3776d592 | 75 | |
7cc27f44 UD |
76 | /* This is a hack to make the special getopt in GNU libc working. */ |
77 | __getopt_clean_environment (); | |
78 | ||
3776d592 RM |
79 | #ifdef PIC |
80 | __libc_global_ctors (); | |
81 | #endif | |
0324daa0 RM |
82 | } |
83 | ||
84 | #ifdef PIC | |
0324daa0 | 85 | |
3776d592 | 86 | SYSDEP_CALL_INIT(_init, init); |
0324daa0 RM |
87 | |
88 | void | |
3776d592 | 89 | __libc_init_first (void) |
0324daa0 | 90 | { |
0324daa0 | 91 | } |
0324daa0 | 92 | |
3776d592 RM |
93 | #else |
94 | ||
95 | SYSDEP_CALL_INIT(__libc_init_first, init); | |
0324daa0 | 96 | |
0324daa0 | 97 | #endif |
e320cbc9 UD |
98 | |
99 | ||
100 | /* This function is defined here so that if this file ever gets into | |
101 | ld.so we will get a link error. Having this file silently included | |
102 | in ld.so causes disaster, because the _init definition above will | |
103 | cause ld.so to gain an init function, which is not a cool thing. */ | |
104 | ||
105 | void | |
a68b0d31 | 106 | _dl_start (void) |
e320cbc9 UD |
107 | { |
108 | abort (); | |
109 | } |