Line data    Source code

       1             : /* Get symbol version information at the given index.
       2             :    Copyright (C) 1999, 2000, 2001, 2002, 2005, 2009, 2014, 2015 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written by Ulrich Drepper <drepper@redhat.com>, 1999.
       5             : 
       6             :    This file is free software; you can redistribute it and/or modify
       7             :    it under the terms of either
       8             : 
       9             :      * the GNU Lesser General Public License as published by the Free
      10             :        Software Foundation; either version 3 of the License, or (at
      11             :        your option) any later version
      12             : 
      13             :    or
      14             : 
      15             :      * the GNU General Public License as published by the Free
      16             :        Software Foundation; either version 2 of the License, or (at
      17             :        your option) any later version
      18             : 
      19             :    or both in parallel, as here.
      20             : 
      21             :    elfutils is distributed in the hope that it will be useful, but
      22             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24             :    General Public License for more details.
      25             : 
      26             :    You should have received copies of the GNU General Public License and
      27             :    the GNU Lesser General Public License along with this program.  If
      28             :    not, see <http://www.gnu.org/licenses/>.  */
      29             : 
      30             : #ifdef HAVE_CONFIG_H
      31             : # include <config.h>
      32             : #endif
      33             : 
      34             : #include <assert.h>
      35             : #include <gelf.h>
      36             : #include <string.h>
      37             : 
      38             : #include "libelfP.h"
      39             : 
      40             : 
      41             : GElf_Versym *
      42        6654 : gelf_getversym (Elf_Data *data, int ndx, GElf_Versym *dst)
      43             : {
      44        6654 :   Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
      45             :   Elf_Scn *scn;
      46             :   GElf_Versym *result;
      47             : 
      48        6654 :   if (data == NULL)
      49             :     return NULL;
      50             : 
      51        6654 :   if (unlikely (data->d_type != ELF_T_HALF))
      52             :     {
      53           0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      54           0 :       return NULL;
      55             :     }
      56             : 
      57             :   /* This is the one place where we have to take advantage of the fact
      58             :      that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'.
      59             :      The interface is broken so that it requires this hack.  */
      60        6654 :   scn = data_scn->s;
      61             : 
      62             :   /* It's easy to handle this type.  It has the same size for 32 and
      63             :      64 bit objects.  */
      64             :   assert (sizeof (GElf_Versym) == sizeof (Elf32_Versym));
      65             :   assert (sizeof (GElf_Versym) == sizeof (Elf64_Versym));
      66             : 
      67             :   rwlock_rdlock (scn->elf->lock);
      68             : 
      69             :   /* The data is already in the correct form.  Just make sure the
      70             :      index is OK.  */
      71        6654 :   if (INVALID_NDX (ndx, GElf_Versym, data))
      72             :     {
      73           0 :       __libelf_seterrno (ELF_E_INVALID_INDEX);
      74           0 :       result = NULL;
      75             :     }
      76             :   else
      77             :     {
      78        6654 :       *dst = ((GElf_Versym *) data->d_buf)[ndx];
      79             : 
      80        6654 :       result = dst;
      81             :     }
      82             : 
      83             :   rwlock_unlock (scn->elf->lock);
      84             : 
      85        6654 :   return result;
      86             : }