elf/dl-support.c

   1 /* Support for dynamic linking code in static libc.
   2    Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
   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 not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  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.  */
  22
  23 #include <errno.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <elf/ldsodefs.h>
  27 #include <dl-machine.h>
  28
  29 extern char *__progname;
  30 char **_dl_argv = &__progname;  /* This is checked for some error messages.  */
  31
  32 /* Name of the architecture.  */
  33 const char *_dl_platform;
  34 size_t _dl_platformlen;
  35
  36 int _dl_debug_libs;
  37 int _dl_debug_impcalls;
  38 int _dl_debug_bindings;
  39 int _dl_debug_symbols;
  40 int _dl_debug_versions;
  41 int _dl_debug_reloc;
  42 int _dl_debug_files;
  43
  44 /* If nonzero print warnings about problematic situations.  */
  45 int _dl_verbose;
  46
  47 /* Structure to store information about search paths.  */
  48 struct r_search_path *_dl_search_paths;
  49
  50 /* We never do profiling.  */
  51 const char *_dl_profile;
  52
  53 /* Names of shared object for which the RPATHs should be ignored.  */
  54 const char *_dl_inhibit_rpath;
  55
  56 /* The map for the object we will profile.  */
  57 struct link_map *_dl_profile_map;
  58
  59 /* This is the address of the last stack address ever used.  */
  60 void *__libc_stack_end;
  61
  62 /* Path where the binary is found.  */
  63 const char *_dl_origin_path;
  64
  65 /* Initially empty list of loaded objects.  */
  66 struct link_map *_dl_loaded;
  67
  68 /* Fake scope.  In dynamically linked binaries this is the scope of the
  69    main application but here we don't have something like this.  So
  70    create a fake scope containing nothing.  */
  71 struct r_scope_elem _dl_initial_searchlist;
  72 /* Variable which can be used in lookup to process the global scope.  */
  73 struct r_scope_elem *_dl_global_scope[2] = { &_dl_initial_searchlist, NULL };
  74 /* This is a global pointer to this structure which is public.  It is
  75    used by dlopen/dlclose to add and remove objects from what is regarded
  76    to be the global scope.  */
  77 struct r_scope_elem *_dl_main_searchlist = &_dl_initial_searchlist;
  78
  79
  80 static void non_dynamic_init (void) __attribute__ ((unused));
  81
  82 static void
  83 non_dynamic_init (void)
  84 {
  85   _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1;
  86
  87   _dl_pagesize = __getpagesize ();
  88
  89   /* Initialize the data structures for the search paths for shared
  90      objects.  */
  91   _dl_init_paths (getenv ("LD_LIBRARY_PATH"));
  92
  93 #ifdef DL_PLATFORM_INIT
  94   DL_PLATFORM_INIT;
  95 #endif
  96
  97   /* Now determine the length of the platform string.  */
  98   if (_dl_platform != NULL)
  99     _dl_platformlen = strlen (_dl_platform);
 100 }
 101 text_set_element (__libc_subinit, non_dynamic_init);
 102
 103 const struct r_strlenpair *
 104 internal_function
 105 _dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz,
 106                       size_t *max_capstrlen)
 107 {
 108   struct r_strlenpair *result;
 109
 110   /* XXX We don't try to find the capabilities in this case.  */
 111   result = (struct r_strlenpair *) malloc (sizeof (*result));
 112   if (result == NULL)
 113     _dl_signal_error (ENOMEM, NULL, "cannot create capability list");
 114
 115   result[0].str = (char *) result;      /* Does not really matter.  */
 116   result[0].len = 0;
 117
 118   *sz = 1;
 119   return result;
 120 }