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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [dl/] [dl-sym.c] - Rev 262
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/* Look up a symbol in a shared object loaded by `dlopen'. Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <stddef.h> #include <setjmp.h> #include <libintl.h> #include <dlfcn.h> #include <ldsodefs.h> #include <dl-hash.h> void * internal_function _dl_sym (void *handle, const char *name, void *who) { const ElfW(Sym) *ref = NULL; lookup_t result; ElfW(Addr) caller = (ElfW(Addr)) who; struct link_map *match; struct link_map *l; /* If the address is not recognized the call comes from the main program (we hope). */ match = _dl_loaded; /* Find the highest-addressed object that CALLER is not below. */ for (l = _dl_loaded; l != NULL; l = l->l_next) if (caller >= l->l_map_start && caller < l->l_map_end) { /* There must be exactly one DSO for the range of the virtual memory. Otherwise something is really broken. */ match = l; break; } if (handle == RTLD_DEFAULT) /* Search the global scope as seen in the caller object. */ result = _dl_lookup_symbol (name, match, &ref, match->l_scope, 0, 0); else { if (handle != RTLD_NEXT) { /* Search the scope of the given object. */ struct link_map *map = handle; result = _dl_lookup_symbol (name, match, &ref, map->l_local_scope, 0, 1); } else { if (__builtin_expect (match == _dl_loaded, 0)) { if (! _dl_loaded || caller < _dl_loaded->l_map_start || caller >= _dl_loaded->l_map_end) _dl_signal_error (0, NULL, NULL, N_("\ RTLD_NEXT used in code not dynamically loaded")); } l = match; while (l->l_loader != NULL) l = l->l_loader; result = _dl_lookup_symbol_skip (name, l, &ref, l->l_local_scope, match); } } if (ref != NULL) return DL_SYMBOL_ADDRESS (result, ref); return NULL; } void * internal_function _dl_vsym (void *handle, const char *name, const char *version, void *who) { const ElfW(Sym) *ref = NULL; struct r_found_version vers; lookup_t result; ElfW(Addr) caller = (ElfW(Addr)) who; struct link_map *match; struct link_map *l; /* Compute hash value to the version string. */ vers.name = version; vers.hidden = 1; vers.hash = _dl_elf_hash (version); /* We don't have a specific file where the symbol can be found. */ vers.filename = NULL; /* If the address is not recognized the call comes from the main program (we hope). */ match = _dl_loaded; /* Find the highest-addressed object that CALLER is not below. */ for (l = _dl_loaded; l != NULL; l = l->l_next) if (caller >= l->l_map_start && caller < l->l_map_end) { /* There must be exactly one DSO for the range of the virtual memory. Otherwise something is really broken. */ match = l; break; } if (handle == RTLD_DEFAULT) /* Search the global scope. */ result = _dl_lookup_versioned_symbol (name, match, &ref, match->l_scope, &vers, 0, 0); else if (handle == RTLD_NEXT) { if (__builtin_expect (match == _dl_loaded, 0)) { if (! _dl_loaded || caller < _dl_loaded->l_map_start || caller >= _dl_loaded->l_map_end) _dl_signal_error (0, NULL, NULL, N_("\ RTLD_NEXT used in code not dynamically loaded")); } l = match; while (l->l_loader != NULL) l = l->l_loader; result = _dl_lookup_versioned_symbol_skip (name, l, &ref, l->l_local_scope, &vers, match); } else { /* Search the scope of the given object. */ struct link_map *map = handle; result = _dl_lookup_versioned_symbol (name, map, &ref, map->l_local_scope, &vers, 0, 1); } if (ref != NULL) return DL_SYMBOL_ADDRESS (result, ref); return NULL; }
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