1 /* Support for dynamic linking code in static libc.
2 Copyright (C) 1996,97,98,99,2000 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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. */
20 /* This file defines some things that for the dynamic linker are defined in
21 rtld.c and dl-sysdep.c in ways appropriate to bootstrap dynamic linking. */
28 #include <dl-machine.h>
29 #include <bits/libc-lock.h>
31 extern char *__progname;
32 char **_dl_argv = &__progname; /* This is checked for some error messages. */
34 /* Name of the architecture. */
35 const char *_dl_platform;
36 size_t _dl_platformlen;
39 int _dl_debug_impcalls;
40 int _dl_debug_bindings;
41 int _dl_debug_symbols;
42 int _dl_debug_versions;
48 /* If nonzero print warnings about problematic situations. */
51 /* Structure to store information about search paths. */
52 struct r_search_path *_dl_search_paths;
54 /* We never do profiling. */
55 const char *_dl_profile;
57 /* Names of shared object for which the RUNPATHs and RPATHs should be
59 const char *_dl_inhibit_rpath;
61 /* The map for the object we will profile. */
62 struct link_map *_dl_profile_map;
64 /* This is the address of the last stack address ever used. */
65 void *__libc_stack_end;
67 /* Path where the binary is found. */
68 const char *_dl_origin_path;
70 /* Nonzero if runtime lookup should not update the .got/.plt. */
73 /* Initially empty list of loaded objects. */
74 struct link_map *_dl_loaded;
76 /* Fake scope. In dynamically linked binaries this is the scope of the
77 main application but here we don't have something like this. So
78 create a fake scope containing nothing. */
79 struct r_scope_elem _dl_initial_searchlist;
80 /* Variable which can be used in lookup to process the global scope. */
81 struct r_scope_elem *_dl_global_scope[2] = { &_dl_initial_searchlist, NULL };
82 /* This is a global pointer to this structure which is public. It is
83 used by dlopen/dlclose to add and remove objects from what is regarded
84 to be the global scope. */
85 struct r_scope_elem *_dl_main_searchlist = &_dl_initial_searchlist;
87 /* Nonzero during startup. */
88 int _dl_starting_up = 1;
90 /* During the program run we must not modify the global data of
91 loaded shared object simultanously in two threads. Therefore we
92 protect `_dl_open' and `_dl_close' in dl-close.c.
94 This must be a recursive lock since the initializer function of
95 the loaded object might as well require a call to this function.
96 At this time it is not anymore a problem to modify the tables. */
97 __libc_lock_define_initialized_recursive (, _dl_load_lock)
100 static void non_dynamic_init (void) __attribute__ ((unused));
103 non_dynamic_init (void)
105 _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1;
107 _dl_pagesize = __getpagesize ();
109 /* Initialize the data structures for the search paths for shared
111 _dl_init_paths (getenv ("LD_LIBRARY_PATH"));
113 _dl_lazy = *(getenv ("LD_BIND_NOW") ?: "") == '\0';
115 _dl_bind_not = *(getenv ("LD_BIND_NOT") ?: "") != '\0';
117 _dl_dynamic_weak = *(getenv ("LD_DYNAMIC_WEAK") ?: "") == '\0';
119 #ifdef DL_PLATFORM_INIT
123 /* Now determine the length of the platform string. */
124 if (_dl_platform != NULL)
125 _dl_platformlen = strlen (_dl_platform);
127 text_set_element (__libc_subinit, non_dynamic_init);
129 const struct r_strlenpair *
131 _dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz,
132 size_t *max_capstrlen)
134 struct r_strlenpair *result;
136 /* XXX We don't try to find the capabilities in this case. */
137 result = (struct r_strlenpair *) malloc (sizeof (*result));
139 _dl_signal_error (ENOMEM, NULL, N_("cannot create capability list"));
141 result[0].str = (char *) result; /* Does not really matter. */