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_and_read (abfd, ptrsize, ptrsize);
 112   if (raw_armap == NULL
 113       || bfd_bread (stringbase, stringsize, abfd) != stringsize)
 114     {
 115       if (bfd_get_error () != bfd_error_system_call)
 116         bfd_set_error (bfd_error_malformed_archive);
 117       goto release_symdefs;
 118     }
 119
 120   stringend = stringbase + stringsize;
 121   *stringend = 0;
 122   for (i = 0; i < nsymz; i++)
 123     {
 124       carsyms->file_offset = bfd_getb64 (raw_armap + i * 8);
 125       carsyms->name = stringbase;
 126       stringbase += strlen (stringbase);
 127       if (stringbase != stringend)
 128         ++stringbase;
 129       ++carsyms;
 130     }
 131
 132   ardata->symdef_count = nsymz;
 133   ardata->first_file_filepos = bfd_tell (abfd);
 134   /* Pad to an even boundary if you have to.  */
 135   ardata->first_file_filepos += (ardata->first_file_filepos) % 2;
 136
 137   abfd->has_armap = TRUE;
 138   bfd_release (abfd, raw_armap);
 139
 140   return TRUE;
 141
 142  release_symdefs:
 143   bfd_release (abfd, ardata->symdefs);
 144   return FALSE;
 145 }
 146
 147 /* Write out an Irix 6 armap.  The Irix 6 tools are supposed to be
 148    able to handle ordinary ELF armaps, but at least on Irix 6.2 the
 149    linker crashes.  */
 150
 151 bfd_boolean
 152 _bfd_archive_64_bit_write_armap (bfd *arch,
 153                                  unsigned int elength,
 154                                  struct orl *map,
 155                                  unsigned int symbol_count,
 156                                  int stridx)
 157 {
 158   unsigned int ranlibsize = (symbol_count * 8) + 8;
 159   unsigned int stringsize = stridx;
 160   unsigned int mapsize = stringsize + ranlibsize;
 161   file_ptr archive_member_file_ptr;
 162   bfd *current = arch->archive_head;
 163   unsigned int count;
 164   struct ar_hdr hdr;
 165   int padding;
 166   bfd_byte buf[8];
 167
 168   padding = BFD_ALIGN (mapsize, 8) - mapsize;
 169   mapsize += padding;
 170
 171   /* work out where the first object file will go in the archive */
 172   archive_member_file_ptr = (mapsize
 173                              + elength
 174                              + sizeof (struct ar_hdr)
 175                              + SARMAG);
 176
 177   memset (&hdr, ' ', sizeof (struct ar_hdr));
 178   memcpy (hdr.ar_name, "/SYM64/", strlen ("/SYM64/"));
 179   if (!_bfd_ar_sizepad (hdr.ar_size, sizeof (hdr.ar_size), mapsize))
 180     return FALSE;
 181   _bfd_ar_spacepad (hdr.ar_date, sizeof (hdr.ar_date), "%ld",
 182                     time (NULL));
 183   /* This, at least, is what Intel coff sets the values to.: */
 184   _bfd_ar_spacepad (hdr.ar_uid, sizeof (hdr.ar_uid), "%ld", 0);
 185   _bfd_ar_spacepad (hdr.ar_gid, sizeof (hdr.ar_gid), "%ld", 0);
 186   _bfd_ar_spacepad (hdr.ar_mode, sizeof (hdr.ar_mode), "%-7lo", 0);
 187   memcpy (hdr.ar_fmag, ARFMAG, 2);
 188
 189   /* Write the ar header for this item and the number of symbols */
 190
 191   if (bfd_bwrite (&hdr, sizeof (struct ar_hdr), arch)
 192       != sizeof (struct ar_hdr))
 193     return FALSE;
 194
 195   bfd_putb64 ((bfd_vma) symbol_count, buf);
 196   if (bfd_bwrite (buf, 8, arch) != 8)
 197     return FALSE;
 198
 199   /* Two passes, first write the file offsets for each symbol -
 200      remembering that each offset is on a two byte boundary.  */
 201
 202   /* Write out the file offset for the file associated with each
 203      symbol, and remember to keep the offsets padded out.  */
 204   count = 0;
 205   for (current = arch->archive_head;
 206        current != NULL && count < symbol_count;
 207        current = current->archive_next)
 208     {
 209       /* For each symbol which is used defined in this object, write out
 210          the object file's address in the archive.  */
 211
 212       for (;
 213            count < symbol_count && map[count].u.abfd == current;
 214            count++)
 215         {
 216           bfd_putb64 ((bfd_vma) archive_member_file_ptr, buf);
 217           if (bfd_bwrite (buf, 8, arch) != 8)
 218             return FALSE;
 219         }
 220
 221       /* Add size of this archive entry */
 222       archive_member_file_ptr += sizeof (struct ar_hdr);
 223       if (! bfd_is_thin_archive (arch))
 224         archive_member_file_ptr += arelt_size (current);
 225       /* remember about the even alignment */
 226       archive_member_file_ptr += archive_member_file_ptr % 2;
 227     }
 228
 229   /* now write the strings themselves */
 230   for (count = 0; count < symbol_count; count++)
 231     {
 232       size_t len = strlen (*map[count].name) + 1;
 233
 234       if (bfd_bwrite (*map[count].name, len, arch) != len)
 235         return FALSE;
 236     }
 237
 238   /* The spec says that this should be padded to an 8 byte boundary.
 239      However, the Irix 6.2 tools do not appear to do this.  */
 240   while (padding != 0)
 241     {
 242       if (bfd_bwrite ("", 1, arch) != 1)
 243         return FALSE;
 244       --padding;
 245     }
 246
 247   return TRUE;
 248 }