Branch data     Line data    Source code

       1                 :            : /* Return number of program headers in the ELF file.
       2                 :            :    Copyright (C) 2010 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            : 
       5                 :            :    This file is free software; you can redistribute it and/or modify
       6                 :            :    it under the terms of either
       7                 :            : 
       8                 :            :      * the GNU Lesser General Public License as published by the Free
       9                 :            :        Software Foundation; either version 3 of the License, or (at
      10                 :            :        your option) any later version
      11                 :            : 
      12                 :            :    or
      13                 :            : 
      14                 :            :      * the GNU General Public License as published by the Free
      15                 :            :        Software Foundation; either version 2 of the License, or (at
      16                 :            :        your option) any later version
      17                 :            : 
      18                 :            :    or both in parallel, as here.
      19                 :            : 
      20                 :            :    elfutils is distributed in the hope that it will be useful, but
      21                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23                 :            :    General Public License for more details.
      24                 :            : 
      25                 :            :    You should have received copies of the GNU General Public License and
      26                 :            :    the GNU Lesser General Public License along with this program.  If
      27                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      28                 :            : 
      29                 :            : #ifdef HAVE_CONFIG_H
      30                 :            : # include <config.h>
      31                 :            : #endif
      32                 :            : 
      33                 :            : #include <assert.h>
      34                 :            : #include <gelf.h>
      35                 :            : #include <stddef.h>
      36                 :            : 
      37                 :            : #include "libelfP.h"
      38                 :            : 
      39                 :            : 
      40                 :            : int
      41                 :      10658 : __elf_getphdrnum_rdlock (elf, dst)
      42                 :            :      Elf *elf;
      43                 :            :      size_t *dst;
      44                 :            : {
      45         [ -  + ]:      10658 :  if (unlikely (elf->state.elf64.ehdr == NULL))
      46                 :            :    {
      47                 :            :      /* Maybe no ELF header was created yet.  */
      48                 :          0 :      __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
      49                 :          0 :      return -1;
      50                 :            :    }
      51                 :            : 
      52         [ +  + ]:      10658 :  *dst = (elf->class == ELFCLASS32
      53                 :        201 :          ? elf->state.elf32.ehdr->e_phnum
      54                 :      10457 :          : elf->state.elf64.ehdr->e_phnum);
      55                 :            : 
      56         [ -  + ]:      10658 :  if (*dst == PN_XNUM)
      57                 :            :    {
      58         [ #  # ]:          0 :      const Elf_ScnList *const scns = (elf->class == ELFCLASS32
      59                 :            :                                       ? &elf->state.elf32.scns
      60                 :            :                                       : &elf->state.elf64.scns);
      61                 :            : 
      62                 :            :      /* If there are no section headers, perhaps this is really just 65536
      63                 :            :         written without PN_XNUM support.  Either that or it's bad data.  */
      64                 :            : 
      65         [ #  # ]:          0 :      if (likely (scns->cnt > 0))
      66         [ #  # ]:      10658 :        *dst = (elf->class == ELFCLASS32
      67                 :          0 :                ? scns->data[0].shdr.e32->sh_info
      68                 :          0 :                : scns->data[0].shdr.e64->sh_info);
      69                 :            :    }
      70                 :            : 
      71                 :            :  return 0;
      72                 :            : }
      73                 :            : 
      74                 :            : int
      75                 :       5309 : elf_getphdrnum (elf, dst)
      76                 :            :      Elf *elf;
      77                 :            :      size_t *dst;
      78                 :            : {
      79                 :            :   int result;
      80                 :            : 
      81         [ +  - ]:       5309 :   if (elf == NULL)
      82                 :            :     return -1;
      83                 :            : 
      84         [ -  + ]:       5309 :   if (unlikely (elf->kind != ELF_K_ELF))
      85                 :            :     {
      86                 :          0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      87                 :          0 :       return -1;
      88                 :            :     }
      89                 :            : 
      90                 :            :   rwlock_rdlock (elf->lock);
      91                 :       5309 :   result = __elf_getphdrnum_rdlock (elf, dst);
      92                 :            :   rwlock_unlock (elf->lock);
      93                 :            : 
      94                 :       5309 :   return result;
      95                 :            : }