loader/aout.c

   1 /*
   2  *  Copyright (C) 2008 Free Software Foundation, Inc.
   3  *
   4  *  This program is free software: you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation, either version 3 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program 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
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <grub/file.h>
  19 #include <grub/err.h>
  20 #include <grub/dl.h>
  21 #include <grub/misc.h>
  22 #include <grub/aout.h>
  23
  24 int
  25 grub_aout_get_type (union grub_aout_header *header)
  26 {
  27   int magic;
  28
  29   magic = AOUT_GETMAGIC (header->aout32);
  30   if ((magic == AOUT32_OMAGIC) || (magic == AOUT32_NMAGIC) ||
  31       (magic == AOUT32_ZMAGIC) || (magic == AOUT32_QMAGIC))
  32     return AOUT_TYPE_AOUT32;
  33   else if ((magic == AOUT64_OMAGIC) || (magic == AOUT64_NMAGIC) ||
  34            (magic == AOUT64_ZMAGIC))
  35     return AOUT_TYPE_AOUT64;
  36   else
  37     return AOUT_TYPE_NONE;
  38 }
  39
  40 grub_err_t
  41 grub_aout_load (grub_file_t file, int offset,
  42                 grub_addr_t load_addr,
  43                 int load_size,
  44                 grub_addr_t bss_end_addr)
  45 {
  46   if ((grub_file_seek (file, offset)) == (grub_off_t) - 1)
  47     return grub_errno;
  48
  49   if (!load_size)
  50     load_size = file->size - offset;
  51
  52   grub_file_read (file, (void *) load_addr, load_size);
  53
  54   if (grub_errno)
  55     return grub_errno;
  56
  57   if (bss_end_addr)
  58     grub_memset ((char *) load_addr + load_size, 0,
  59                  bss_end_addr - load_addr - load_size);
  60
  61   return GRUB_ERR_NONE;
  62 }