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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [dl/] [dl-init.c] - Blame information for rev 207

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1 207 jeremybenn
/* Return the next shared object initializer function not yet run.
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   Copyright (C) 1995,1996,1998,1999,2000,2001 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, write to the Free
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   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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   02111-1307 USA.  */
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#include <stddef.h>
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#include <ldsodefs.h>
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/* Type of the initializer.  */
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typedef void (*init_t) (int, char **, char **);
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/* Flag, nonzero during startup phase.  */
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extern int _dl_starting_up;
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/* The object to be initialized first.  */
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extern struct link_map *_dl_initfirst;
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static void
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call_init (struct link_map *l, int argc, char **argv, char **env)
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{
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  if (l->l_init_called)
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    /* This object is all done.  */
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    return;
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  /* Avoid handling this constructor again in case we have a circular
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     dependency.  */
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  l->l_init_called = 1;
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  /* Check for object which constructors we do not run here.  */
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  if (__builtin_expect (l->l_name[0], 'a') == '\0'
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      && l->l_type == lt_executable)
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    return;
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  /* Are there any constructors?  */
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  if (l->l_info[DT_INIT] == NULL
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      && __builtin_expect (l->l_info[DT_INIT_ARRAY] == NULL, 1))
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    return;
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  /* Print a debug message if wanted.  */
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  if (__builtin_expect (_dl_debug_mask & DL_DEBUG_IMPCALLS, 0))
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    _dl_debug_printf ("\ncalling init: %s\n\n",
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                      l->l_name[0] ? l->l_name : _dl_argv[0]);
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  /* Now run the local constructors.  There are two forms of them:
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     - the one named by DT_INIT
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     - the others in the DT_INIT_ARRAY.
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  */
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  if (l->l_info[DT_INIT] != NULL)
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    {
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      init_t init = (init_t) DL_DT_INIT_ADDRESS
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        (l, l->l_addr + l->l_info[DT_INIT]->d_un.d_ptr);
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      /* Call the function.  */
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      init (argc, argv, env);
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    }
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  /* Next see whether there is an array with initialization functions.  */
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  if (l->l_info[DT_INIT_ARRAY] != NULL)
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    {
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      unsigned int j;
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      unsigned int jm;
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      ElfW(Addr) *addrs;
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      jm = l->l_info[DT_INIT_ARRAYSZ]->d_un.d_val / sizeof (ElfW(Addr));
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      addrs = (ElfW(Addr) *) (l->l_info[DT_INIT_ARRAY]->d_un.d_ptr
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                              + l->l_addr);
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      for (j = 0; j < jm; ++j)
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        ((init_t) addrs[j]) (argc, argv, env);
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    }
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}
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void
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internal_function
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_dl_init (struct link_map *main_map, int argc, char **argv, char **env)
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{
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  ElfW(Dyn) *preinit_array = main_map->l_info[DT_PREINIT_ARRAY];
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  struct r_debug *r;
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  unsigned int i;
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  if (__builtin_expect (_dl_initfirst != NULL, 0))
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    {
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      call_init (_dl_initfirst, argc, argv, env);
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      _dl_initfirst = NULL;
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    }
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  /* Don't do anything if there is no preinit array.  */
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  if (__builtin_expect (preinit_array != NULL, 0)
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      && (i = preinit_array->d_un.d_val / sizeof (ElfW(Addr))) > 0)
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    {
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      ElfW(Addr) *addrs;
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      unsigned int cnt;
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      if (__builtin_expect (_dl_debug_mask & DL_DEBUG_IMPCALLS, 0))
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        _dl_debug_printf ("\ncalling preinit: %s\n\n",
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                          main_map->l_name[0]
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                          ? main_map->l_name : _dl_argv[0]);
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      addrs = (ElfW(Addr) *) (main_map->l_info[DT_PREINIT_ARRAY]->d_un.d_ptr
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                              + main_map->l_addr);
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      for (cnt = 0; cnt < i; ++cnt)
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        ((init_t) addrs[cnt]) (argc, argv, env);
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    }
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  /* Notify the debugger we have added some objects.  We need to call
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     _dl_debug_initialize in a static program in case dynamic linking has
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     not been used before.  */
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  r = _dl_debug_initialize (0);
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  r->r_state = RT_ADD;
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  _dl_debug_state ();
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  /* Stupid users forced the ELF specification to be changed.  It now
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     says that the dynamic loader is responsible for determining the
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     order in which the constructors have to run.  The constructors
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     for all dependencies of an object must run before the constructor
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     for the object itself.  Circular dependencies are left unspecified.
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     This is highly questionable since it puts the burden on the dynamic
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     loader which has to find the dependencies at runtime instead of
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     letting the user do it right.  Stupidity rules!  */
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  i = main_map->l_searchlist.r_nlist;
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  while (i-- > 0)
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    call_init (main_map->l_initfini[i], argc, argv, env);
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  /* Notify the debugger all new objects are now ready to go.  */
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  r->r_state = RT_CONSISTENT;
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  _dl_debug_state ();
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  /* Finished starting up.  */
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  _dl_starting_up = 0;
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}

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