bfd/archive64.c

   1 /* Support for 64-bit archives.
   2    Copyright (C) 1996-2020 Free Software Foundation, Inc.
   3    Ian Lance Taylor, Cygnus Support
   4    Linker support added by Mark Mitchell, CodeSourcery, LLC.
   5    <mark@codesourcery.com>
   6
   7    This file is part of BFD, the Binary File Descriptor library.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  22    MA 02110-1301, USA.  */
  23
  24 /* This file supports the 64-bit archives.  We use the same format as
  25    the 64-bit (MIPS) ELF archives.  */
  26
  27 #include "sysdep.h"
  28 #include "bfd.h"
  29 #include "libbfd.h"
  30 #include "aout/ar.h"
  31
  32 /* Irix 6 defines a 64bit archive map format, so that they can
  33    have archives more than 4 GB in size.  */
  34
  35 /* Read an Irix 6 armap.  */
  36
  37 bfd_boolean
  38 _bfd_archive_64_bit_slurp_armap (bfd *abfd)
  39 {
  40   struct artdata *ardata = bfd_ardata (abfd);
  41   char nextname[17];
  42   bfd_size_type i, parsed_size, nsymz, stringsize, carsym_size, ptrsize;
  43   struct areltdata *mapdata;
  44   bfd_byte int_buf[8];
  45   char *stringbase;
  46   char *stringend;
  47   bfd_byte *raw_armap = NULL;
  48   carsym *carsyms;
  49   bfd_size_type amt;
  50
  51   ardata->symdefs = NULL;
  52
  53   /* Get the name of the first element.  */
  54   i = bfd_bread (nextname, 16, abfd);
  55   if (i == 0)
  56     return TRUE;
  57   if (i != 16)
  58     return FALSE;
  59
  60   if (bfd_seek (abfd, (file_ptr) - 16, SEEK_CUR) != 0)
  61     return FALSE;
  62
  63   /* Archives with traditional armaps are still permitted.  */
  64   if (CONST_STRNEQ (nextname, "/               "))
  65     return bfd_slurp_armap (abfd);
  66
  67   if (! CONST_STRNEQ (nextname, "/SYM64/         "))
  68     {
  69       abfd->has_armap = FALSE;
  70       return TRUE;
  71     }
  72
  73   mapdata = (struct areltdata *) _bfd_read_ar_hdr (abfd);
  74   if (mapdata == NULL)
  75     return FALSE;
  76   parsed_size = mapdata->parsed_size;
  77   free (mapdata);
  78
  79   if (bfd_bread (int_buf, 8, abfd) != 8)
  80     {
  81       if (bfd_get_error () != bfd_error_system_call)
  82         bfd_set_error (bfd_error_malformed_archive);
  83       return FALSE;
  84     }
  85
  86   nsymz = bfd_getb64 (int_buf);
  87   stringsize = parsed_size - 8 * nsymz - 8;
  88
  89   carsym_size = nsymz * sizeof (carsym);
  90   ptrsize = 8 * nsymz;
  91
  92   amt = carsym_size + stringsize + 1;
  93   if (/* Catch overflow in stringsize (and ptrsize) expression.  */
  94       nsymz >= (bfd_size_type) -1 / 8
  95       || stringsize > parsed_size
  96       /* Catch overflow in carsym_size expression.  */
  97       || nsymz > (bfd_size_type) -1 / sizeof (carsym)
  98       /* Catch overflow in amt expression.  */
  99       || amt <= carsym_size
 100       || amt <= stringsize)
 101     {
 102       bfd_set_error (bfd_error_malformed_archive);
 103       return FALSE;
 104     }
 105   ardata->symdefs = (struct carsym *) bfd_zalloc (abfd, amt);
 106   if (ardata->symdefs == NULL)
 107     return FALSE;
 108   carsyms = ardata->symdefs;
 109   stringbase = ((char *) ardata->symdefs) + carsym_size;
 110
 111   raw_armap = (bfd_byte *) bfd_alloc (abfd, ptrsize);
 112   if (raw_armap == NULL)
 113     goto release_symdefs;
 114
 115   if (bfd_bread (raw_armap, ptrsize, abfd) != ptrsize
 116       || bfd_bread (stringbase, stringsize, abfd) != stringsize)
 117     {
 118       if (bfd_get_error () != bfd_error_system_call)
 119         bfd_set_error (bfd_error_malformed_archive);
 120       goto release_symdefs;
 121     }
 122
 123   stringend = stringbase + stringsize;
 124   *stringend = 0;
 125   for (i = 0; i < nsymz; i++)
 126     {
 127       carsyms->file_offset = bfd_getb64 (raw_armap + i * 8);
 128       carsyms->name = stringbase;
 129       stringbase += strlen (stringbase);
 130       if (stringbase != stringend)
 131         ++stringbase;
 132       ++carsyms;
 133     }
 134
 135   ardata->symdef_count = nsymz;
 136   ardata->first_file_filepos = bfd_tell (abfd);
 137   /* Pad to an even boundary if you have to.  */
 138   ardata->first_file_filepos += (ardata->first_file_filepos) % 2;
 139
 140   abfd->has_armap = TRUE;
 141   bfd_release (abfd, raw_armap);
 142
 143   return TRUE;
 144
 145 release_symdefs:
 146   bfd_release (abfd, ardata->symdefs);
 147   return FALSE;
 148 }
 149
 150 /* Write out an Irix 6 armap.  The Irix 6 tools are supposed to be
 151    able to handle ordinary ELF armaps, but at least on Irix 6.2 the
 152    linker crashes.  */
 153
 154 bfd_boolean
 155 _bfd_archive_64_bit_write_armap (bfd *arch,
 156                                  unsigned int elength,
 157                                  struct orl *map,
 158                                  unsigned int symbol_count,
 159                                  int stridx)
 160 {
 161   unsigned int ranlibsize = (symbol_count * 8) + 8;
 162   unsigned int stringsize = stridx;
 163   unsigned int mapsize = stringsize + ranlibsize;
 164   file_ptr archive_member_file_ptr;
 165   bfd *current = arch->archive_head;
 166   unsigned int count;
 167   struct ar_hdr hdr;
 168   int padding;
 169   bfd_byte buf[8];
 170
 171   padding = BFD_ALIGN (mapsize, 8) - mapsize;
 172   mapsize += padding;
 173
 174   /* work out where the first object file will go in the archive */
 175   archive_member_file_ptr = (mapsize
 176                              + elength
 177                              + sizeof (struct ar_hdr)
 178                              + SARMAG);
 179
 180   memset (&hdr, ' ', sizeof (struct ar_hdr));
 181   memcpy (hdr.ar_name, "/SYM64/", strlen ("/SYM64/"));
 182   if (!_bfd_ar_sizepad (hdr.ar_size, sizeof (hdr.ar_size), mapsize))
 183     return FALSE;
 184   _bfd_ar_spacepad (hdr.ar_date, sizeof (hdr.ar_date), "%ld",
 185                     time (NULL));
 186   /* This, at least, is what Intel coff sets the values to.: */
 187   _bfd_ar_spacepad (hdr.ar_uid, sizeof (hdr.ar_uid), "%ld", 0);
 188   _bfd_ar_spacepad (hdr.ar_gid, sizeof (hdr.ar_gid), "%ld", 0);
 189   _bfd_ar_spacepad (hdr.ar_mode, sizeof (hdr.ar_mode), "%-7lo", 0);
 190   memcpy (hdr.ar_fmag, ARFMAG, 2);
 191
 192   /* Write the ar header for this item and the number of symbols */
 193
 194   if (bfd_bwrite (&hdr, sizeof (struct ar_hdr), arch)
 195       != sizeof (struct ar_hdr))
 196     return FALSE;
 197
 198   bfd_putb64 ((bfd_vma) symbol_count, buf);
 199   if (bfd_bwrite (buf, 8, arch) != 8)
 200     return FALSE;
 201
 202   /* Two passes, first write the file offsets for each symbol -
 203      remembering that each offset is on a two byte boundary.  */
 204
 205   /* Write out the file offset for the file associated with each
 206      symbol, and remember to keep the offsets padded out.  */
 207   count = 0;
 208   for (current = arch->archive_head;
 209        current != NULL && count < symbol_count;
 210        current = current->archive_next)
 211     {
 212       /* For each symbol which is used defined in this object, write out
 213          the object file's address in the archive.  */
 214
 215       for (;
 216            count < symbol_count && map[count].u.abfd == current;
 217            count++)
 218         {
 219           bfd_putb64 ((bfd_vma) archive_member_file_ptr, buf);
 220           if (bfd_bwrite (buf, 8, arch) != 8)
 221             return FALSE;
 222         }
 223
 224       /* Add size of this archive entry */
 225       archive_member_file_ptr += sizeof (struct ar_hdr);
 226       if (! bfd_is_thin_archive (arch))
 227         archive_member_file_ptr += arelt_size (current);
 228       /* remember about the even alignment */
 229       archive_member_file_ptr += archive_member_file_ptr % 2;
 230     }
 231
 232   /* now write the strings themselves */
 233   for (count = 0; count < symbol_count; count++)
 234     {
 235       size_t len = strlen (*map[count].name) + 1;
 236
 237       if (bfd_bwrite (*map[count].name, len, arch) != len)
 238         return FALSE;
 239     }
 240
 241   /* The spec says that this should be padded to an 8 byte boundary.
 242      However, the Irix 6.2 tools do not appear to do this.  */
 243   while (padding != 0)
 244     {
 245       if (bfd_bwrite ("", 1, arch) != 1)
 246         return FALSE;
 247       --padding;
 248     }
 249
 250   return TRUE;
 251 }