/* Run initializers for newly loaded objects.

   Copyright (C) 1995-2018 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, see

   <http://www.gnu.org/licenses/>.  */

#include <stddef.h>

#include <ldsodefs.h>

/* Type of the initializer.  */

typedef void (*init_t) (int, char **, char **);

static void

call_init (struct link_map *l, int argc, char **argv, char **env)

{

  if (l->l_init_called)

    /* This object is all done.  */

    return;

  /* Avoid handling this constructor again in case we have a circular

     dependency.  */

  l->l_init_called = 1;

  /* Check for object which constructors we do not run here.  */

  if (__builtin_expect (l->l_name[0], 'a') == '\0'

      && l->l_type == lt_executable)

    return;

  /* Are there any constructors?  */

  if (l->l_info[DT_INIT] == NULL

      && __builtin_expect (l->l_info[DT_INIT_ARRAY] == NULL, 1))

    return;

  /* Print a debug message if wanted.  */

  if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))

    _dl_debug_printf ("\ncalling init: %s\n\n",

		      DSO_FILENAME (l->l_name));

  /* Now run the local constructors.  There are two forms of them:

     - the one named by DT_INIT

     - the others in the DT_INIT_ARRAY.

  */

  if (l->l_info[DT_INIT] != NULL)

    DL_CALL_DT_INIT(l, l->l_addr + l->l_info[DT_INIT]->d_un.d_ptr, argc, argv, env);

  /* Next see whether there is an array with initialization functions.  */

  ElfW(Dyn) *init_array = l->l_info[DT_INIT_ARRAY];

  if (init_array != NULL)

    {

      unsigned int j;

      unsigned int jm;

      ElfW(Addr) *addrs;

      jm = l->l_info[DT_INIT_ARRAYSZ]->d_un.d_val / sizeof (ElfW(Addr));

      addrs = (ElfW(Addr) *) (init_array->d_un.d_ptr + l->l_addr);

      for (j = 0; j < jm; ++j)

	((init_t) addrs[j]) (argc, argv, env);

    }

}

void

_dl_init (struct link_map *main_map, int argc, char **argv, char **env)

{

  ElfW(Dyn) *preinit_array = main_map->l_info[DT_PREINIT_ARRAY];

  ElfW(Dyn) *preinit_array_size = main_map->l_info[DT_PREINIT_ARRAYSZ];

  unsigned int i;

  if (__glibc_unlikely (GL(dl_initfirst) != NULL))

    {

      call_init (GL(dl_initfirst), argc, argv, env);

      GL(dl_initfirst) = NULL;

    }

  /* Don't do anything if there is no preinit array.  */

  if (__builtin_expect (preinit_array != NULL, 0)

      && preinit_array_size != NULL

      && (i = preinit_array_size->d_un.d_val / sizeof (ElfW(Addr))) > 0)

    {

      ElfW(Addr) *addrs;

      unsigned int cnt;

      if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))

	_dl_debug_printf ("\ncalling preinit: %s\n\n",

			  DSO_FILENAME (main_map->l_name));

      addrs = (ElfW(Addr) *) (preinit_array->d_un.d_ptr + main_map->l_addr);

      for (cnt = 0; cnt < i; ++cnt)

	((init_t) addrs[cnt]) (argc, argv, env);

    }

  /* Stupid users forced the ELF specification to be changed.  It now

     says that the dynamic loader is responsible for determining the

     order in which the constructors have to run.  The constructors

     for all dependencies of an object must run before the constructor

     for the object itself.  Circular dependencies are left unspecified.

     This is highly questionable since it puts the burden on the dynamic

     loader which has to find the dependencies at runtime instead of

     letting the user do it right.  Stupidity rules!  */

  i = main_map->l_searchlist.r_nlist;

  while (i-- > 0)

    call_init (main_map->l_initfini[i], argc, argv, env);

  /* Finished starting up.  */

  _dl_starting_up = 0;

}