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

   1 /* Copyright (C) 1999-2023 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 *isa_level, char **soname,
  20                         void *file_contents, size_t file_length);
  21 int process_elf64_file (const char *file_name, const char *lib,
  22                         int *flag, unsigned int *isa_level, char **soname,
  23                         void *file_contents, size_t file_length);
  24
  25 /* Returns 0 if everything is ok, != 0 in case of error.  */
  26 int
  27 process_elf_file (const char *file_name, const char *lib, int *flag,
  28                   unsigned int *isa_level, char **soname, void *file_contents,
  29                   size_t file_length)
  30 {
  31   ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents;
  32   int ret, file_flag = 0;
  33
  34   switch (elf_header->e_machine)
  35     {
  36     case EM_X86_64:
  37       if (elf_header->e_ident[EI_CLASS] == ELFCLASS64)
  38         /* X86-64 64bit libraries are always libc.so.6+.  */
  39         file_flag = FLAG_X8664_LIB64|FLAG_ELF_LIBC6;
  40       else
  41         /* X32 libraries are always libc.so.6+.  */
  42         file_flag = FLAG_X8664_LIBX32|FLAG_ELF_LIBC6;
  43       break;
  44 #ifndef __x86_64__
  45     case EM_IA_64:
  46       if (elf_header->e_ident[EI_CLASS] == ELFCLASS64)
  47         {
  48           /* IA64 64bit libraries are always libc.so.6+.  */
  49           file_flag = FLAG_IA64_LIB64|FLAG_ELF_LIBC6;
  50           break;
  51         }
  52       goto failed;
  53 #endif
  54     case EM_386:
  55       if (elf_header->e_ident[EI_CLASS] == ELFCLASS32)
  56         break;
  57       /* Fall through.  */
  58     default:
  59 #ifndef __x86_64__
  60 failed:
  61 #endif
  62       error (0, 0, _("%s is for unknown machine %d.\n"),
  63              file_name, elf_header->e_machine);
  64       return 1;
  65     }
  66
  67   if (elf_header->e_ident[EI_CLASS] == ELFCLASS32)
  68     ret = process_elf32_file (file_name, lib, flag, isa_level, soname,
  69                               file_contents, file_length);
  70   else
  71     ret = process_elf64_file (file_name, lib, flag, isa_level, soname,
  72                               file_contents, file_length);
  73
  74   if (!ret && file_flag)
  75     *flag = file_flag;
  76
  77   return ret;
  78 }
  79
  80 #undef __ELF_NATIVE_CLASS
  81 #undef process_elf_file
  82 #define process_elf_file process_elf32_file
  83 #define __ELF_NATIVE_CLASS 32
  84 #include "elf/readelflib.c"
  85
  86 #undef __ELF_NATIVE_CLASS
  87 #undef process_elf_file
  88 #define process_elf_file process_elf64_file
  89 #define __ELF_NATIVE_CLASS 64
  90 #include "elf/readelflib.c"