bfd/archive64.c

   1 /* Support for 64-bit archives.
   2    Copyright (C) 1996-2023 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 bool
  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   ufile_ptr filesize;
  51
  52   ardata->symdefs = NULL;
  53
  54   /* Get the name of the first element.  */
  55   i = bfd_bread (nextname, 16, abfd);
  56   if (i == 0)
  57     return true;
  58   if (i != 16)
  59     return false;
  60
  61   if (bfd_seek (abfd, (file_ptr) - 16, SEEK_CUR) != 0)
  62     return false;
  63
  64   /* Archives with traditional armaps are still permitted.  */
  65   if (startswith (nextname, "/               "))
  66     return bfd_slurp_armap (abfd);
  67
  68   if (! startswith (nextname, "/SYM64/         "))
  69     {
  70       abfd->has_armap = false;
  71       return true;
  72     }
  73
  74   mapdata = (struct areltdata *) _bfd_read_ar_hdr (abfd);
  75   if (mapdata == NULL)
  76     return false;
  77   parsed_size = mapdata->parsed_size;
  78   free (mapdata);
  79
  80   filesize = bfd_get_file_size (abfd);
  81   if (filesize != 0 && parsed_size > filesize)
  82     {
  83       bfd_set_error (bfd_error_malformed_archive);
  84       return false;
  85     }
  86
  87   if (bfd_bread (int_buf, 8, abfd) != 8)
  88     {
  89       if (bfd_get_error () != bfd_error_system_call)
  90         bfd_set_error (bfd_error_malformed_archive);
  91       return false;
  92     }
  93
  94   nsymz = bfd_getb64 (int_buf);
  95   stringsize = parsed_size - 8 * nsymz - 8;
  96
  97   carsym_size = nsymz * sizeof (carsym);
  98   ptrsize = 8 * nsymz;
  99
 100   amt = carsym_size + stringsize + 1;
 101   if (/* Catch overflow in stringsize (and ptrsize) expression.  */
 102       nsymz >= (bfd_size_type) -1 / 8
 103       || stringsize > parsed_size
 104       /* Catch overflow in carsym_size expression.  */
 105       || nsymz > (bfd_size_type) -1 / sizeof (carsym)
 106       /* Catch overflow in amt expression.  */
 107       || amt <= carsym_size
 108       || amt <= stringsize)
 109     {
 110       bfd_set_error (bfd_error_malformed_archive);
 111       return false;
 112     }
 113   ardata->symdefs = (struct carsym *) bfd_alloc (abfd, amt);
 114   if (ardata->symdefs == NULL)
 115     return false;
 116   carsyms = ardata->symdefs;
 117   stringbase = ((char *) ardata->symdefs) + carsym_size;
 118
 119   raw_armap = (bfd_byte *) _bfd_alloc_and_read (abfd, ptrsize, ptrsize);
 120   if (raw_armap == NULL
 121       || bfd_bread (stringbase, stringsize, abfd) != stringsize)
 122     {
 123       if (bfd_get_error () != bfd_error_system_call)
 124         bfd_set_error (bfd_error_malformed_archive);
 125       goto release_symdefs;
 126     }
 127
 128   stringend = stringbase + stringsize;
 129   *stringend = 0;
 130   for (i = 0; i < nsymz; i++)
 131     {
 132       carsyms->file_offset = bfd_getb64 (raw_armap + i * 8);
 133       carsyms->name = stringbase;
 134       stringbase += strlen (stringbase);
 135       if (stringbase != stringend)
 136         ++stringbase;
 137       ++carsyms;
 138     }
 139
 140   ardata->symdef_count = nsymz;
 141   ardata->first_file_filepos = bfd_tell (abfd);
 142   /* Pad to an even boundary if you have to.  */
 143   ardata->first_file_filepos += (ardata->first_file_filepos) % 2;
 144
 145   abfd->has_armap = true;
 146   bfd_release (abfd, raw_armap);
 147
 148   return true;
 149
 150  release_symdefs:
 151   bfd_release (abfd, ardata->symdefs);
 152   return false;
 153 }
 154
 155 /* Write out an Irix 6 armap.  The Irix 6 tools are supposed to be
 156    able to handle ordinary ELF armaps, but at least on Irix 6.2 the
 157    linker crashes.  */
 158
 159 bool
 160 _bfd_archive_64_bit_write_armap (bfd *arch,
 161                                  unsigned int elength,
 162                                  struct orl *map,
 163                                  unsigned int symbol_count,
 164                                  int stridx)
 165 {
 166   unsigned int ranlibsize = (symbol_count * 8) + 8;
 167   unsigned int stringsize = stridx;
 168   unsigned int mapsize = stringsize + ranlibsize;
 169   file_ptr archive_member_file_ptr;
 170   bfd *current = arch->archive_head;
 171   unsigned int count;
 172   struct ar_hdr hdr;
 173   int padding;
 174   bfd_byte buf[8];
 175
 176   padding = BFD_ALIGN (mapsize, 8) - mapsize;
 177   mapsize += padding;
 178
 179   /* work out where the first object file will go in the archive */
 180   archive_member_file_ptr = (mapsize
 181                              + elength
 182                              + sizeof (struct ar_hdr)
 183                              + SARMAG);
 184
 185   memset (&hdr, ' ', sizeof (struct ar_hdr));
 186   memcpy (hdr.ar_name, "/SYM64/", strlen ("/SYM64/"));
 187   if (!_bfd_ar_sizepad (hdr.ar_size, sizeof (hdr.ar_size), mapsize))
 188     return false;
 189   _bfd_ar_spacepad (hdr.ar_date, sizeof (hdr.ar_date), "%ld",
 190                     time (NULL));
 191   /* This, at least, is what Intel coff sets the values to.: */
 192   _bfd_ar_spacepad (hdr.ar_uid, sizeof (hdr.ar_uid), "%ld", 0);
 193   _bfd_ar_spacepad (hdr.ar_gid, sizeof (hdr.ar_gid), "%ld", 0);
 194   _bfd_ar_spacepad (hdr.ar_mode, sizeof (hdr.ar_mode), "%-7lo", 0);
 195   memcpy (hdr.ar_fmag, ARFMAG, 2);
 196
 197   /* Write the ar header for this item and the number of symbols */
 198
 199   if (bfd_bwrite (&hdr, sizeof (struct ar_hdr), arch)
 200       != sizeof (struct ar_hdr))
 201     return false;
 202
 203   bfd_putb64 ((bfd_vma) symbol_count, buf);
 204   if (bfd_bwrite (buf, 8, arch) != 8)
 205     return false;
 206
 207   /* Two passes, first write the file offsets for each symbol -
 208      remembering that each offset is on a two byte boundary.  */
 209
 210   /* Write out the file offset for the file associated with each
 211      symbol, and remember to keep the offsets padded out.  */
 212   count = 0;
 213   for (current = arch->archive_head;
 214        current != NULL && count < symbol_count;
 215        current = current->archive_next)
 216     {
 217       /* For each symbol which is used defined in this object, write out
 218          the object file's address in the archive.  */
 219
 220       for (;
 221            count < symbol_count && map[count].u.abfd == current;
 222            count++)
 223         {
 224           bfd_putb64 ((bfd_vma) archive_member_file_ptr, buf);
 225           if (bfd_bwrite (buf, 8, arch) != 8)
 226             return false;
 227         }
 228
 229       /* Add size of this archive entry */
 230       archive_member_file_ptr += sizeof (struct ar_hdr);
 231       if (! bfd_is_thin_archive (arch))
 232         archive_member_file_ptr += arelt_size (current);
 233       /* remember about the even alignment */
 234       archive_member_file_ptr += archive_member_file_ptr % 2;
 235     }
 236
 237   /* now write the strings themselves */
 238   for (count = 0; count < symbol_count; count++)
 239     {
 240       size_t len = strlen (*map[count].name) + 1;
 241
 242       if (bfd_bwrite (*map[count].name, len, arch) != len)
 243         return false;
 244     }
 245
 246   /* The spec says that this should be padded to an 8 byte boundary.
 247      However, the Irix 6.2 tools do not appear to do this.  */
 248   while (padding != 0)
 249     {
 250       if (bfd_bwrite ("", 1, arch) != 1)
 251         return false;
 252       --padding;
 253     }
 254
 255   return true;
 256 }