LCOV - code coverage report
Current view: top level - elfutils/libelf - gelf_getrel.c (source / functions) Hit Total Coverage
Test: lcov.out Lines: 13 23 56.5 %
Date: 2012-10-31 Functions: 1 1 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 5 12 41.7 %

           Branch data     Line data    Source code
       1                 :            : /* Get REL relocation information at given index.
       2                 :            :    Copyright (C) 2000, 2001, 2002 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                 :      14844 : gelf_getrel (data, ndx, dst)
      42                 :            :      Elf_Data *data;
      43                 :            :      int ndx;
      44                 :            :      GElf_Rel *dst;
      45                 :            : {
      46                 :      14844 :   Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
      47                 :            :   Elf_Scn *scn;
      48                 :            :   GElf_Rel *result;
      49                 :            : 
      50         [ +  - ]:      14844 :   if (data_scn == NULL)
      51                 :            :     return NULL;
      52                 :            : 
      53         [ -  + ]:      14844 :   if (unlikely (ndx < 0))
      54                 :            :     {
      55                 :          0 :       __libelf_seterrno (ELF_E_INVALID_INDEX);
      56                 :          0 :       return NULL;
      57                 :            :     }
      58                 :            : 
      59         [ -  + ]:      14844 :   if (unlikely (data_scn->d.d_type != ELF_T_REL))
      60                 :            :     {
      61                 :          0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      62                 :          0 :       return NULL;
      63                 :            :     }
      64                 :            : 
      65                 :            :   /* This is the one place where we have to take advantage of the fact
      66                 :            :      that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'.
      67                 :            :      The interface is broken so that it requires this hack.  */
      68                 :      14844 :   scn = data_scn->s;
      69                 :            : 
      70                 :            :   rwlock_rdlock (scn->elf->lock);
      71                 :            : 
      72         [ +  - ]:      14844 :   if (scn->elf->class == ELFCLASS32)
      73                 :            :     {
      74                 :            :       /* We have to convert the data.  */
      75         [ -  + ]:      14844 :       if (unlikely ((ndx + 1) * sizeof (Elf32_Rel) > data_scn->d.d_size))
      76                 :            :         {
      77                 :          0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
      78                 :          0 :           result = NULL;
      79                 :            :         }
      80                 :            :       else
      81                 :            :         {
      82                 :      14844 :           Elf32_Rel *src = &((Elf32_Rel *) data_scn->d.d_buf)[ndx];
      83                 :            : 
      84                 :      14844 :           dst->r_offset = src->r_offset;
      85                 :      14844 :           dst->r_info = GELF_R_INFO (ELF32_R_SYM (src->r_info),
      86                 :            :                                      ELF32_R_TYPE (src->r_info));
      87                 :            : 
      88                 :      14844 :           result = dst;
      89                 :            :         }
      90                 :            :     }
      91                 :            :   else
      92                 :            :     {
      93                 :            :       /* Simply copy the data after we made sure we are actually getting
      94                 :            :          correct data.  */
      95         [ #  # ]:          0 :       if (unlikely ((ndx + 1) * sizeof (Elf64_Rel) > data_scn->d.d_size))
      96                 :            :         {
      97                 :          0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
      98                 :          0 :           result = NULL;
      99                 :            :         }
     100                 :            :       else
     101                 :          0 :         result = memcpy (dst, &((Elf64_Rel *) data_scn->d.d_buf)[ndx],
     102                 :            :                          sizeof (Elf64_Rel));
     103                 :            :     }
     104                 :            : 
     105                 :            :   rwlock_unlock (scn->elf->lock);
     106                 :            : 
     107                 :      14844 :   return result;
     108                 :            : }

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