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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 | |
23396375 UD |
32 | extern int __libc_is_static; |
33 | #ifdef PIC | |
34 | weak_extern (__libc_is_static) | |
35 | #endif | |
36 | ||
0324daa0 | 37 | static void |
3776d592 | 38 | init (void *data) |
0324daa0 | 39 | { |
8d71c7b0 RM |
40 | extern int __personality (int); |
41 | ||
3776d592 RM |
42 | int argc = *(long *)data; |
43 | char **argv = (char **)data + 1; | |
0324daa0 RM |
44 | char **envp = &argv[argc + 1]; |
45 | ||
23396375 UD |
46 | #ifdef PIC |
47 | if (&__libc_is_static != NULL) | |
48 | #endif | |
49 | { | |
50 | #ifdef PIC | |
51 | /* We must not call `personality' twice. */ | |
52 | if (__libc_is_static == 0) | |
53 | #endif | |
54 | { | |
55 | /* The `personality' system call takes one argument that | |
56 | chooses the "personality", i.e. the set of system calls | |
57 | and such. We must make this call first thing to disable | |
58 | emulation of some other system that might have been | |
59 | enabled by default based on the executable format. */ | |
60 | __personality (PER_LINUX); | |
61 | ||
62 | /* Set the FPU control word to the proper default value. */ | |
63 | __setfpucw (__fpu_control); | |
64 | } | |
65 | ||
66 | /* We set LIBC_IS_STATIC to a value > 0 for the static library | |
67 | and < 0 for the shared library. This information might be | |
68 | useful for the running program but it is mainly necessary for | |
69 | the above `if' statement. */ | |
70 | #ifdef PIC | |
71 | __libc_is_static = -1; | |
72 | #else | |
73 | __libc_is_static = 1; | |
74 | #endif | |
75 | } | |
0324daa0 RM |
76 | |
77 | __environ = envp; | |
78 | __libc_init (argc, argv, envp); | |
3776d592 RM |
79 | |
80 | #ifdef PIC | |
81 | __libc_global_ctors (); | |
82 | #endif | |
0324daa0 RM |
83 | } |
84 | ||
85 | #ifdef PIC | |
0324daa0 | 86 | |
3776d592 | 87 | SYSDEP_CALL_INIT(_init, init); |
0324daa0 RM |
88 | |
89 | void | |
3776d592 | 90 | __libc_init_first (void) |
0324daa0 | 91 | { |
0324daa0 | 92 | } |
0324daa0 | 93 | |
3776d592 RM |
94 | #else |
95 | ||
96 | SYSDEP_CALL_INIT(__libc_init_first, init); | |
0324daa0 | 97 | |
0324daa0 | 98 | #endif |