sysdeps/unix/sysv/linux/x86/readelflib.c

   1 /* Copyright (C) 1999-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 int process_elf32_file (const char *file_name, const char *lib,
  19                         int *flag, unsigned int *osversion,
  20                         unsigned int *isa_level, char **soname,
  21                         void *file_contents, size_t file_length);
  22 int process_elf64_file (const char *file_name, const char *lib,
  23                         int *flag, unsigned int *osversion,
  24                         unsigned int *isa_level, char **soname,
  25                         void *file_contents, size_t file_length);
  26
  27 /* Returns 0 if everything is ok, != 0 in case of error.  */
  28 int
  29 process_elf_file (const char *file_name, const char *lib, int *flag,
  30                   unsigned int *osversion, unsigned int *isa_level,
  31                   char **soname, void *file_contents, size_t file_length)
  32 {
  33   ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents;
  34   int ret, file_flag = 0;
  35
  36   switch (elf_header->e_machine)
  37     {
  38     case EM_X86_64:
  39       if (elf_header->e_ident[EI_CLASS] == ELFCLASS64)
  40         /* X86-64 64bit libraries are always libc.so.6+.  */
  41         file_flag = FLAG_X8664_LIB64|FLAG_ELF_LIBC6;
  42       else
  43         /* X32 libraries are always libc.so.6+.  */
  44         file_flag = FLAG_X8664_LIBX32|FLAG_ELF_LIBC6;
  45       break;
  46 #ifndef __x86_64__
  47     case EM_IA_64:
  48       if (elf_header->e_ident[EI_CLASS] == ELFCLASS64)
  49         {
  50           /* IA64 64bit libraries are always libc.so.6+.  */
  51           file_flag = FLAG_IA64_LIB64|FLAG_ELF_LIBC6;
  52           break;
  53         }
  54       goto failed;
  55 #endif
  56     case EM_386:
  57       if (elf_header->e_ident[EI_CLASS] == ELFCLASS32)
  58         break;
  59       /* Fall through.  */
  60     default:
  61 #ifndef __x86_64__
  62 failed:
  63 #endif
  64       error (0, 0, _("%s is for unknown machine %d.\n"),
  65              file_name, elf_header->e_machine);
  66       return 1;
  67     }
  68
  69   if (elf_header->e_ident[EI_CLASS] == ELFCLASS32)
  70     ret = process_elf32_file (file_name, lib, flag, osversion, isa_level,
  71                               soname, file_contents, file_length);
  72   else
  73     ret = process_elf64_file (file_name, lib, flag, osversion, isa_level,
  74                               soname, file_contents, file_length);
  75
  76   if (!ret && file_flag)
  77     *flag = file_flag;
  78
  79   return ret;
  80 }
  81
  82 #undef __ELF_NATIVE_CLASS
  83 #undef process_elf_file
  84 #define process_elf_file process_elf32_file
  85 #define __ELF_NATIVE_CLASS 32
  86 #include "elf/readelflib.c"
  87
  88 #undef __ELF_NATIVE_CLASS
  89 #undef process_elf_file
  90 #define process_elf_file process_elf64_file
  91 #define __ELF_NATIVE_CLASS 64
  92 #include "elf/readelflib.c"