external/bsd/file/dist/src/elfclass.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) Christos Zoulas 2008.
   5  * All Rights Reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice immediately at the beginning of the file, without modification,
  12  *    this list of conditions, and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  21  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29         if (nbytes <= sizeof(elfhdr))
  30                 return 0;
  31
  32         u.l = 1;
  33         (void)memcpy(&elfhdr, buf, sizeof elfhdr);
  34         swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[EI_DATA];
  35
  36         type = elf_getu16(swap, elfhdr.e_type);
  37         switch (type) {
  38 #ifdef ELFCORE
  39         case ET_CORE:
  40                 if (dophn_core(ms, clazz, swap, fd,
  41                     (off_t)elf_getu(swap, elfhdr.e_phoff),
  42                     elf_getu16(swap, elfhdr.e_phnum),
  43                     (size_t)elf_getu16(swap, elfhdr.e_phentsize),
  44                     fsize, &flags) == -1)
  45                         return -1;
  46                 break;
  47 #endif
  48         case ET_EXEC:
  49         case ET_DYN:
  50                 if (dophn_exec(ms, clazz, swap, fd,
  51                     (off_t)elf_getu(swap, elfhdr.e_phoff),
  52                     elf_getu16(swap, elfhdr.e_phnum),
  53                     (size_t)elf_getu16(swap, elfhdr.e_phentsize),
  54                     fsize, &flags, elf_getu16(swap, elfhdr.e_shnum))
  55                     == -1)
  56                         return -1;
  57                 /*FALLTHROUGH*/
  58         case ET_REL:
  59                 if (doshn(ms, clazz, swap, fd,
  60                     (off_t)elf_getu(swap, elfhdr.e_shoff),
  61                     elf_getu16(swap, elfhdr.e_shnum),
  62                     (size_t)elf_getu16(swap, elfhdr.e_shentsize),
  63                     &flags,
  64                     elf_getu16(swap, elfhdr.e_machine)) == -1)
  65                         return -1;
  66                 break;
  67
  68         default:
  69                 break;
  70         }
  71         return 1;