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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 | |
0324daa0 | 39 | static void |
3776d592 | 40 | init (void *data) |
0324daa0 | 41 | { |
8d71c7b0 RM |
42 | extern int __personality (int); |
43 | ||
3776d592 RM |
44 | int argc = *(long *)data; |
45 | char **argv = (char **)data + 1; | |
0324daa0 RM |
46 | char **envp = &argv[argc + 1]; |
47 | ||
a8922de8 | 48 | |
39778c6c UD |
49 | __libc_multiple_libcs = &_dl_starting_up && ! _dl_starting_up; |
50 | ||
51 | /* We must not call `personality' twice. */ | |
52 | if (!__libc_multiple_libcs) | |
23396375 | 53 | { |
39778c6c UD |
54 | /* The `personality' system call takes one argument that chooses |
55 | the "personality", i.e. the set of system calls and such. We | |
56 | must make this call first thing to disable emulation of some | |
57 | other system that might have been enabled by default based on | |
58 | the executable format. */ | |
59 | __personality (PER_LINUX); | |
60 | ||
61 | /* Set the FPU control word to the proper default value. */ | |
62 | __setfpucw (__fpu_control); | |
23396375 | 63 | } |
0324daa0 RM |
64 | |
65 | __environ = envp; | |
66 | __libc_init (argc, argv, envp); | |
3776d592 RM |
67 | |
68 | #ifdef PIC | |
69 | __libc_global_ctors (); | |
70 | #endif | |
0324daa0 RM |
71 | } |
72 | ||
73 | #ifdef PIC | |
0324daa0 | 74 | |
3776d592 | 75 | SYSDEP_CALL_INIT(_init, init); |
0324daa0 RM |
76 | |
77 | void | |
3776d592 | 78 | __libc_init_first (void) |
0324daa0 | 79 | { |
0324daa0 | 80 | } |
0324daa0 | 81 | |
3776d592 RM |
82 | #else |
83 | ||
84 | SYSDEP_CALL_INIT(__libc_init_first, init); | |
0324daa0 | 85 | |
0324daa0 | 86 | #endif |