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2a072de4 RM |
1 | /* Initialization code run first thing by the ELF startup code. Linux version. |
2 | Copyright (C) 1995, 1996 Free Software Foundation, Inc. | |
0324daa0 RM |
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 | |
17 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
18 | Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include <unistd.h> | |
41cfadd6 | 21 | #include <sysdep.h> |
3776d592 | 22 | #include <fpu_control.h> |
23396375 | 23 | #include <linux/personality.h> |
3776d592 | 24 | #include "init-first.h" |
2a072de4 | 25 | |
0324daa0 RM |
26 | extern void __libc_init (int, char **, char **); |
27 | extern void __libc_global_ctors (void); | |
28 | ||
3776d592 RM |
29 | /* The function is called from assembly stubs the compiler can't see. */ |
30 | static void init (void *) __attribute__ ((unused)); | |
0324daa0 | 31 | |
39778c6c UD |
32 | extern int _dl_starting_up; |
33 | weak_extern (_dl_starting_up) | |
34 | ||
35 | /* Set nonzero if we have to be prepared for more then one libc being | |
36 | used in the process. Safe assumption if initializer never runs. */ | |
37 | int __libc_multiple_libcs = 1; | |
23396375 | 38 | |
dcf0671d UD |
39 | /* Remember the command line argument and enviroment contents for |
40 | later calls of initializers for dynamic libraries. */ | |
41 | int __libc_argc; | |
42 | char **__libc_argv; | |
43 | char **__libc_envp; | |
44 | ||
45 | ||
0324daa0 | 46 | static void |
3776d592 | 47 | init (void *data) |
0324daa0 | 48 | { |
8d71c7b0 RM |
49 | extern int __personality (int); |
50 | ||
39778c6c UD |
51 | __libc_multiple_libcs = &_dl_starting_up && ! _dl_starting_up; |
52 | ||
dcf0671d | 53 | |
39778c6c UD |
54 | /* We must not call `personality' twice. */ |
55 | if (!__libc_multiple_libcs) | |
23396375 | 56 | { |
dcf0671d UD |
57 | /* The argument we got points to the values describing the |
58 | command line argument etc. */ | |
59 | __libc_argc = *(int *)data; | |
60 | __libc_argv = (char **)data + 1; | |
61 | __libc_envp = &__libc_argv[__libc_argc + 1]; | |
62 | ||
39778c6c UD |
63 | /* The `personality' system call takes one argument that chooses |
64 | the "personality", i.e. the set of system calls and such. We | |
65 | must make this call first thing to disable emulation of some | |
66 | other system that might have been enabled by default based on | |
67 | the executable format. */ | |
68 | __personality (PER_LINUX); | |
69 | ||
70 | /* Set the FPU control word to the proper default value. */ | |
71 | __setfpucw (__fpu_control); | |
23396375 | 72 | } |
dcf0671d UD |
73 | else |
74 | { | |
75 | /* The argument we got points to the values describing the | |
76 | command line argument etc. */ | |
77 | __libc_argc = *((int *)data)++; | |
78 | __libc_argv = *((char ***)data)++; | |
79 | __libc_envp = *(char ***)data; | |
80 | } | |
0324daa0 | 81 | |
dcf0671d UD |
82 | __environ = __libc_envp; |
83 | __libc_init (__libc_argc, __libc_argv, __libc_envp); | |
3776d592 RM |
84 | |
85 | #ifdef PIC | |
86 | __libc_global_ctors (); | |
87 | #endif | |
0324daa0 RM |
88 | } |
89 | ||
90 | #ifdef PIC | |
0324daa0 | 91 | |
3776d592 | 92 | SYSDEP_CALL_INIT(_init, init); |
0324daa0 RM |
93 | |
94 | void | |
3776d592 | 95 | __libc_init_first (void) |
0324daa0 | 96 | { |
0324daa0 | 97 | } |
0324daa0 | 98 | |
3776d592 RM |
99 | #else |
100 | ||
101 | SYSDEP_CALL_INIT(__libc_init_first, init); | |
0324daa0 | 102 | |
0324daa0 | 103 | #endif |