1: /* Get loaded objects program headers.
    2:    Copyright (C) 2001,2002,2003,2004,2006,2007 Free Software Foundation, Inc.
    3:    This file is part of the GNU C Library.
    4:    Contributed by Jakub Jelinek <jakub@redhat.com>, 2001.
    5: 
    6:    The GNU C Library is free software; you can redistribute it and/or
    7:    modify it under the terms of the GNU Lesser General Public License as
    8:    published by the Free Software Foundation; either version 2.1 of the
    9:    License, or (at your option) any later version.
   10: 
   11:    The GNU C Library is distributed in the hope that it will be useful,
   12:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   13:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   14:    Lesser General Public License for more details.
   15: 
   16:    You should have received a copy of the GNU Lesser General Public
   17:    License along with the GNU C Library; see the file COPYING.LIB.  If not,
   18:    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   19:    Boston, MA 02111-1307, USA.  */
   20: 
   21: #include <errno.h>
   22: #include <ldsodefs.h>
   23: #include <stddef.h>
   24: #include <bits/libc-lock.h>
   25: 
   26: static void
   27: cancel_handler (void *arg __attribute__((unused)))
   28: {
   29:   __rtld_lock_unlock_recursive (GL(dl_load_lock));
   30: }
   31: 
   32: hidden_proto (__dl_iterate_phdr)
   33: int
   34: __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info,
   35:                                     size_t size, void *data), void *data)
   36: {
   37:   struct link_map *l;
   38:   struct dl_phdr_info info;
   39:   int ret = 0;
   40: 
   41:   /* Make sure we are alone.  */
   42:   __rtld_lock_lock_recursive (GL(dl_load_lock));
   43:   __libc_cleanup_push (cancel_handler, 0);
   44: 
   45:   /* We have to determine the namespace of the caller since this determines
   46:      which namespace is reported.  */
   47:   const void *caller = RETURN_ADDRESS (0);
   48:   size_t nloaded = GL(dl_ns)[0]._ns_nloaded;
   49:   Lmid_t ns = 0;
   50:   for (Lmid_t cnt = DL_NNS - 1; cnt > 0; --cnt)
   51:     for (struct link_map *l = GL(dl_ns)[cnt]._ns_loaded; l; l = l->l_next)
   52:       {
   53:         /* We have to count the total number of loaded objects.  */
   54:         nloaded += GL(dl_ns)[cnt]._ns_nloaded;
   55: 
   56:         if (caller >= (const void *) l->l_map_start
   57:             && caller < (const void *) l->l_map_end
   58:             && (l->l_contiguous
   59:                 || _dl_addr_inside_object (l, (ElfW(Addr)) caller)))
   60:           ns = cnt;
   61:       }
   62: 
   63:   for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)
   64:     {
   65:       info.dlpi_addr = l->l_addr;
   66:       info.dlpi_name = l->l_name;
   67:       info.dlpi_phdr = l->l_phdr;
   68:       info.dlpi_phnum = l->l_phnum;
   69:       info.dlpi_adds = GL(dl_load_adds);
   70:       info.dlpi_subs = GL(dl_load_adds) - nloaded;
   71:       info.dlpi_tls_modid = 0;
   72:       info.dlpi_tls_data = NULL;
   73:       info.dlpi_tls_modid = l->l_tls_modid;
   74:       if (info.dlpi_tls_modid != 0)
   75:         info.dlpi_tls_data = _dl_tls_get_addr_soft (l);
   76:       ret = callback (&info, sizeof (struct dl_phdr_info), data);
   77:       if (ret)
   78:         break;
   79:     }
   80: 
   81:   /* Release the lock.  */
   82:   __libc_cleanup_pop (0);
   83:   __rtld_lock_unlock_recursive (GL(dl_load_lock));
   84: 
   85:   return ret;
   86: }
   87: hidden_def (__dl_iterate_phdr)
   88: 
   89: #ifdef SHARED
   90: 
   91: weak_alias (__dl_iterate_phdr, dl_iterate_phdr);
   92: 
   93: #else
   94: 
   95: /* dl-support.c defines these and initializes them early on.  */
   96: extern ElfW(Phdr) *_dl_phdr;
   97: extern size_t _dl_phnum;
   98: 
   99: int
  100: dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info,
  101:                                   size_t size, void *data), void *data)
  102: {
  103:   if (_dl_phnum != 0)
  104:     {
  105:       /* This entry describes this statically-linked program itself.  */
  106:       struct dl_phdr_info info;
  107:       int ret;
  108:       info.dlpi_addr = 0;
  109:       info.dlpi_name = "";
  110:       info.dlpi_phdr = _dl_phdr;
  111:       info.dlpi_phnum = _dl_phnum;
  112:       info.dlpi_adds = GL(dl_load_adds);
  113:       info.dlpi_subs = GL(dl_load_adds) - GL(dl_ns)[LM_ID_BASE]._ns_nloaded;
  114:       ret = (*callback) (&info, sizeof (struct dl_phdr_info), data);
  115:       if (ret)
  116:         return ret;
  117:     }
  118: 
  119:   return __dl_iterate_phdr (callback, data);
  120: }
  121: 
  122: 
  123: #endif