/* Support for dynamic linking code in static libc. Copyright (C) 1996-2001, 2002 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. */ /* This file defines some things that for the dynamic linker are defined in rtld.c and dl-sysdep.c in ways appropriate to bootstrap dynamic linking. */ #include #include #include #include #include #include #include #include #include #include #include extern char *__progname; char **_dl_argv = &__progname; /* This is checked for some error messages. */ /* Name of the architecture. */ const char *_dl_platform; size_t _dl_platformlen; int _dl_debug_mask; int _dl_lazy; /* XXX I know about at least one case where we depend on the old weak behavior (it has to do with librt). Until we get DSO groups implemented we have to make this the default. Bummer. --drepper */ #if 0 int _dl_dynamic_weak; #else int _dl_dynamic_weak = 1; #endif /* If nonzero print warnings about problematic situations. */ int _dl_verbose; /* We never do profiling. */ const char *_dl_profile; /* Names of shared object for which the RUNPATHs and RPATHs should be ignored. */ const char *_dl_inhibit_rpath; /* The map for the object we will profile. */ struct link_map *_dl_profile_map; /* This is the address of the last stack address ever used. */ void *__libc_stack_end; /* Path where the binary is found. */ const char *_dl_origin_path; /* Nonzero if runtime lookup should not update the .got/.plt. */ int _dl_bind_not; /* Initially empty list of loaded objects. */ struct link_map *_dl_loaded; /* Number of object in the _dl_loaded list. */ unsigned int _dl_nloaded; /* Fake scope. In dynamically linked binaries this is the scope of the main application but here we don't have something like this. So create a fake scope containing nothing. */ struct r_scope_elem _dl_initial_searchlist; /* Variable which can be used in lookup to process the global scope. */ struct r_scope_elem *_dl_global_scope[2] = { &_dl_initial_searchlist, NULL }; /* This is a global pointer to this structure which is public. It is used by dlopen/dlclose to add and remove objects from what is regarded to be the global scope. */ struct r_scope_elem *_dl_main_searchlist = &_dl_initial_searchlist; /* Nonzero during startup. */ int _dl_starting_up = 1; /* We expect less than a second for relocation. */ #ifdef HP_SMALL_TIMING_AVAIL # undef HP_TIMING_AVAIL # define HP_TIMING_AVAIL HP_SMALL_TIMING_AVAIL #endif /* Initial value of the CPU clock. */ #ifndef HP_TIMING_NONAVAIL hp_timing_t _dl_cpuclock_offset; #endif /* This is zero at program start to signal that the global scope map is allocated by rtld. Later it keeps the size of the map. It might be reset if in _dl_close if the last global object is removed. */ size_t _dl_global_scope_alloc; size_t _dl_pagesize; unsigned int _dl_osversion; /* All known directories in sorted order. */ struct r_search_path_elem *_dl_all_dirs; /* All directories after startup. */ struct r_search_path_elem *_dl_init_all_dirs; /* The object to be initialized first. */ struct link_map *_dl_initfirst; /* Descriptor to write debug messages to. */ int _dl_debug_fd = STDERR_FILENO; int _dl_correct_cache_id = _DL_CACHE_DEFAULT_ID; /* During the program run we must not modify the global data of loaded shared object simultanously in two threads. Therefore we protect `_dl_open' and `_dl_close' in dl-close.c. This must be a recursive lock since the initializer function of the loaded object might as well require a call to this function. At this time it is not anymore a problem to modify the tables. */ __libc_lock_define_initialized_recursive (, _dl_load_lock) #ifdef HAVE_AUX_VECTOR int _dl_clktck; void internal_function _dl_aux_init (ElfW(auxv_t) *av) { for (; av->a_type != AT_NULL; ++av) switch (av->a_type) { case AT_PAGESZ: GL(dl_pagesize) = av->a_un.a_val; break; case AT_CLKTCK: GL(dl_clktck) = av->a_un.a_val; break; } } #endif static void non_dynamic_init (void) __attribute__ ((unused)); static void non_dynamic_init (void) { if (HP_TIMING_AVAIL) HP_TIMING_NOW (_dl_cpuclock_offset); if (!_dl_pagesize) _dl_pagesize = __getpagesize (); _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1; /* Initialize the data structures for the search paths for shared objects. */ _dl_init_paths (getenv ("LD_LIBRARY_PATH")); _dl_lazy = *(getenv ("LD_BIND_NOW") ?: "") == '\0'; _dl_bind_not = *(getenv ("LD_BIND_NOT") ?: "") != '\0'; _dl_dynamic_weak = *(getenv ("LD_DYNAMIC_WEAK") ?: "") == '\0'; if (__libc_enable_secure) { static const char *unsecure_envvars[] = { UNSECURE_ENVVARS, #ifdef EXTRA_UNSECURE_ENVVARS EXTRA_UNSECURE_ENVVARS #endif }; size_t cnt; for (cnt = 0; cnt < sizeof (unsecure_envvars) / sizeof (unsecure_envvars[0]); ++cnt) unsetenv (unsecure_envvars[cnt]); if (__access ("/etc/suid-debug", F_OK) != 0) unsetenv ("MALLOC_CHECK_"); } #ifdef DL_PLATFORM_INIT DL_PLATFORM_INIT; #endif /* Now determine the length of the platform string. */ if (_dl_platform != NULL) _dl_platformlen = strlen (_dl_platform); } text_set_element (__libc_subinit, non_dynamic_init); const struct r_strlenpair * internal_function _dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz, size_t *max_capstrlen) { static struct r_strlenpair result; static char buf[1]; result.str = buf; /* Does not really matter. */ result.len = 0; *sz = 1; return &result; }