Line data    Source code

       1             : /* Get ELF header.
       2             :    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005, 2015 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written 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 <gelf.h>
      35             : #include <stddef.h>
      36             : #include <stdlib.h>
      37             : #include <string.h>
      38             : 
      39             : #include "libelfP.h"
      40             : 
      41             : 
      42             : GElf_Ehdr *
      43             : internal_function
      44      582162 : __gelf_getehdr_rdlock (Elf *elf, GElf_Ehdr *dest)
      45             : {
      46      582162 :   GElf_Ehdr *result = NULL;
      47             : 
      48      582162 :   if (elf == NULL)
      49             :     return NULL;
      50             : 
      51      582162 :   if (unlikely (elf->kind != ELF_K_ELF))
      52             :     {
      53           0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      54           0 :       return NULL;
      55             :     }
      56             : 
      57             :   /* The following is an optimization: the ehdr element is at the same
      58             :      position in both the elf32 and elf64 structure.  */
      59      582162 :   if (offsetof (struct Elf, state.elf32.ehdr)
      60             :       != offsetof (struct Elf, state.elf64.ehdr))
      61             :     abort ();
      62             :   /* Just pick one of the values.  */
      63      582162 :  if (unlikely (elf->state.elf64.ehdr == NULL))
      64             :     /* Maybe no ELF header was created yet.  */
      65           0 :     __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
      66      582162 :   else if (elf->class == ELFCLASS32)
      67             :     {
      68      402591 :       Elf32_Ehdr *ehdr = elf->state.elf32.ehdr;
      69             : 
      70             :       /* Convert the 32-bit struct to an 64-bit one.  */
      71      402591 :       memcpy (dest->e_ident, ehdr->e_ident, EI_NIDENT);
      72             : #define COPY(name) \
      73             :       dest->name = ehdr->name
      74      402591 :       COPY (e_type);
      75      402591 :       COPY (e_machine);
      76      402591 :       COPY (e_version);
      77      402591 :       COPY (e_entry);
      78      402591 :       COPY (e_phoff);
      79      402591 :       COPY (e_shoff);
      80      402591 :       COPY (e_flags);
      81      402591 :       COPY (e_ehsize);
      82      402591 :       COPY (e_phentsize);
      83      402591 :       COPY (e_phnum);
      84      402591 :       COPY (e_shentsize);
      85      402591 :       COPY (e_shnum);
      86      402591 :       COPY (e_shstrndx);
      87             : 
      88      402591 :       result = dest;
      89             :     }
      90             :   else
      91      359142 :     result = memcpy (dest, elf->state.elf64.ehdr, sizeof (*dest));
      92             : 
      93             :   return result;
      94             : }
      95             : 
      96             : GElf_Ehdr *
      97      581782 : gelf_getehdr (Elf *elf, GElf_Ehdr *dest)
      98             : {
      99      581782 :   GElf_Ehdr *result;
     100      581782 :   if (elf == NULL)
     101             :     return NULL;
     102             : 
     103      581782 :   rwlock_rdlock (elf->lock);
     104      581782 :   result = __gelf_getehdr_rdlock (elf, dest);
     105      581782 :   rwlock_unlock (elf->lock);
     106             : 
     107      581782 :   return result;
     108             : }