LCOV - code coverage report
Current view: top level - libelf - elf_getscn.c (source / functions) Hit Total Coverage
Test: elfutils-0.178 Lines: 27 34 79.4 %
Date: 2019-11-26 23:55:16 Functions: 1 1 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* Get section at specific index.
       2             :    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2015 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
       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 <stddef.h>
      36             : #include <stdlib.h>
      37             : 
      38             : #include "libelfP.h"
      39             : 
      40             : 
      41             : Elf_Scn *
      42  1774818604 : elf_getscn (Elf *elf, size_t idx)
      43             : {
      44  1774818604 :   if (elf == NULL)
      45             :     return NULL;
      46             : 
      47  1774818604 :   if (unlikely (elf->kind != ELF_K_ELF))
      48             :     {
      49           0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      50           0 :       return NULL;
      51             :     }
      52             : 
      53  1774818604 :   rwlock_rdlock (elf->lock);
      54             : 
      55  1774818604 :   Elf_Scn *result = NULL;
      56             : 
      57             :   /* Find the section in the list.  */
      58  1774818604 :   Elf_ScnList *runp = (elf->class == ELFCLASS32
      59             :                        || (offsetof (struct Elf, state.elf32.scns)
      60             :                            == offsetof (struct Elf, state.elf64.scns))
      61             :                        ? &elf->state.elf32.scns : &elf->state.elf64.scns);
      62             : 
      63             :   /* Section zero is special.  It always exists even if there is no
      64             :      "first" section.  And it is needed to store "overflow" values
      65             :      from the Elf header.  */
      66  1774818604 :   if (idx == 0 && runp->cnt == 0 && runp->max > 0)
      67             :     {
      68          17 :       Elf_Scn *scn0 = &runp->data[0];
      69          17 :       if (elf->class == ELFCLASS32)
      70             :         {
      71           9 :           scn0->shdr.e32 = (Elf32_Shdr *) calloc (1, sizeof (Elf32_Shdr));
      72           9 :           if (scn0->shdr.e32 == NULL)
      73             :             {
      74           0 :               __libelf_seterrno (ELF_E_NOMEM);
      75           0 :               goto out;
      76             :             }
      77             :         }
      78             :       else
      79             :         {
      80           8 :           scn0->shdr.e64 = (Elf64_Shdr *) calloc (1, sizeof (Elf64_Shdr));
      81           8 :           if (scn0->shdr.e64 == NULL)
      82             :             {
      83           0 :               __libelf_seterrno (ELF_E_NOMEM);
      84           0 :               goto out;
      85             :             }
      86             :         }
      87          17 :       scn0->elf = elf;
      88          17 :       scn0->shdr_flags = ELF_F_DIRTY | ELF_F_MALLOCED;
      89          17 :       scn0->list = elf->state.elf.scns_last;
      90          17 :       scn0->data_read = 1;
      91          17 :       runp->cnt = 1;
      92             :     }
      93             : 
      94  1776974574 :   while (1)
      95             :     {
      96  1776974574 :       if (idx < runp->max)
      97             :         {
      98  1774818557 :           if (idx < runp->cnt)
      99  1774818557 :             result = &runp->data[idx];
     100             :           else
     101           0 :             __libelf_seterrno (ELF_E_INVALID_INDEX);
     102             :           break;
     103             :         }
     104             : 
     105     2156017 :       idx -= runp->max;
     106             : 
     107     2156017 :       runp = runp->next;
     108     2156017 :       if (runp == NULL)
     109             :         {
     110          47 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
     111          47 :           break;
     112             :         }
     113             :     }
     114             : 
     115             :  out:
     116             :   rwlock_unlock (elf->lock);
     117             : 
     118             :   return result;
     119             : }
     120             : INTDEF(elf_getscn)

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