1 /* Look up a symbol in a shared object loaded by `dlopen'.
2 Copyright (C) 1999, 2000, 2001, 2002 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 Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the 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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
30 _dl_sym (void *handle, const char *name, void *who)
32 const ElfW(Sym) *ref = NULL;
34 ElfW(Addr) caller = (ElfW(Addr)) who;
35 struct link_map *match;
38 /* If the address is not recognized the call comes from the main
40 match = GL(dl_loaded);
42 /* Find the highest-addressed object that CALLER is not below. */
43 for (l = GL(dl_loaded); l != NULL; l = l->l_next)
44 if (caller >= l->l_map_start && caller < l->l_map_end)
46 /* There must be exactly one DSO for the range of the virtual
47 memory. Otherwise something is really broken. */
52 if (handle == RTLD_DEFAULT)
53 /* Search the global scope as seen in the caller object. */
54 result = _dl_lookup_symbol (name, match, &ref, match->l_scope, 0, 0);
57 if (handle != RTLD_NEXT)
59 /* Search the scope of the given object. */
60 struct link_map *map = handle;
62 result = _dl_lookup_symbol (name, match, &ref, map->l_local_scope,
67 if (__builtin_expect (match == GL(dl_loaded), 0))
70 || caller < GL(dl_loaded)->l_map_start
71 || caller >= GL(dl_loaded)->l_map_end)
72 _dl_signal_error (0, NULL, NULL, N_("\
73 RTLD_NEXT used in code not dynamically loaded"));
77 while (l->l_loader != NULL)
80 result = _dl_lookup_symbol_skip (name, l, &ref, l->l_local_scope,
86 return DL_SYMBOL_ADDRESS (result, ref);
93 _dl_vsym (void *handle, const char *name, const char *version, void *who)
95 const ElfW(Sym) *ref = NULL;
96 struct r_found_version vers;
98 ElfW(Addr) caller = (ElfW(Addr)) who;
99 struct link_map *match;
102 /* Compute hash value to the version string. */
105 vers.hash = _dl_elf_hash (version);
106 /* We don't have a specific file where the symbol can be found. */
107 vers.filename = NULL;
109 /* If the address is not recognized the call comes from the main
110 program (we hope). */
111 match = GL(dl_loaded);
113 /* Find the highest-addressed object that CALLER is not below. */
114 for (l = GL(dl_loaded); l != NULL; l = l->l_next)
115 if (caller >= l->l_map_start && caller < l->l_map_end)
117 /* There must be exactly one DSO for the range of the virtual
118 memory. Otherwise something is really broken. */
123 if (handle == RTLD_DEFAULT)
124 /* Search the global scope. */
125 result = _dl_lookup_versioned_symbol (name, match, &ref, match->l_scope,
127 else if (handle == RTLD_NEXT)
129 if (__builtin_expect (match == GL(dl_loaded), 0))
132 || caller < GL(dl_loaded)->l_map_start
133 || caller >= GL(dl_loaded)->l_map_end)
134 _dl_signal_error (0, NULL, NULL, N_("\
135 RTLD_NEXT used in code not dynamically loaded"));
139 while (l->l_loader != NULL)
142 result = _dl_lookup_versioned_symbol_skip (name, l, &ref,
148 /* Search the scope of the given object. */
149 struct link_map *map = handle;
150 result = _dl_lookup_versioned_symbol (name, map, &ref,
151 map->l_local_scope, &vers, 0, 1);
155 return DL_SYMBOL_ADDRESS (result, ref);