Branch data     Line data    Source code

       1                 :            : /* Get REL relocation information at given index.
       2                 :            :    Copyright (C) 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>, 2000.
       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 <gelf.h>
      35                 :            : #include <string.h>
      36                 :            : 
      37                 :            : #include "libelfP.h"
      38                 :            : 
      39                 :            : 
      40                 :            : GElf_Rel *
      41                 :     103344 : gelf_getrel (Elf_Data *data, int ndx, GElf_Rel *dst)
      42                 :            : {
      43                 :     103344 :   Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
      44                 :     103344 :   Elf_Scn *scn;
      45                 :     103344 :   GElf_Rel *result;
      46                 :            : 
      47         [ -  + ]:     103344 :   if (data_scn == NULL)
      48                 :            :     return NULL;
      49                 :            : 
      50         [ -  + ]:     103344 :   if (unlikely (data_scn->d.d_type != ELF_T_REL))
      51                 :            :     {
      52                 :          0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      53                 :          0 :       return NULL;
      54                 :            :     }
      55                 :            : 
      56                 :            :   /* This is the one place where we have to take advantage of the fact
      57                 :            :      that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'.
      58                 :            :      The interface is broken so that it requires this hack.  */
      59                 :     103344 :   scn = data_scn->s;
      60                 :            : 
      61                 :     103344 :   rwlock_rdlock (scn->elf->lock);
      62                 :            : 
      63         [ +  + ]:     103344 :   if (scn->elf->class == ELFCLASS32)
      64                 :            :     {
      65                 :            :       /* We have to convert the data.  */
      66         [ -  + ]:     103308 :       if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d))
      67                 :            :         {
      68                 :          0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
      69                 :          0 :           result = NULL;
      70                 :            :         }
      71                 :            :       else
      72                 :            :         {
      73                 :     103308 :           Elf32_Rel *src = &((Elf32_Rel *) data_scn->d.d_buf)[ndx];
      74                 :            : 
      75                 :     103308 :           dst->r_offset = src->r_offset;
      76                 :     103308 :           dst->r_info = GELF_R_INFO (ELF32_R_SYM (src->r_info),
      77                 :            :                                      ELF32_R_TYPE (src->r_info));
      78                 :            : 
      79                 :     103308 :           result = dst;
      80                 :            :         }
      81                 :            :     }
      82                 :            :   else
      83                 :            :     {
      84                 :            :       /* Simply copy the data after we made sure we are actually getting
      85                 :            :          correct data.  */
      86         [ -  + ]:         36 :       if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d))
      87                 :            :         {
      88                 :          0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
      89                 :          0 :           result = NULL;
      90                 :            :         }
      91                 :            :       else
      92                 :         36 :         result = memcpy (dst, &((Elf64_Rel *) data_scn->d.d_buf)[ndx],
      93                 :            :                          sizeof (Elf64_Rel));
      94                 :            :     }
      95                 :            : 
      96                 :     103344 :   rwlock_unlock (scn->elf->lock);
      97                 :            : 
      98                 :     103344 :   return result;
      99                 :            : }