bfd/archive64.c

   1 /* Support for 64-bit ELF archives.
   2    Copyright (C) 1996-2015 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 (MIPS) ELF archives.  */
  25
  26 #include "sysdep.h"
  27 #include "bfd.h"
  28 #include "libbfd.h"
  29 #include "aout/ar.h"
  30
  31 /* Irix 6 defines a 64bit archive map format, so that they can
  32    have archives more than 4 GB in size.  */
  33
  34 bfd_boolean bfd_elf64_archive_slurp_armap (bfd *);
  35 bfd_boolean bfd_elf64_archive_write_armap
  36   (bfd *, unsigned int, struct orl *, unsigned int, int);
  37
  38 /* Read an Irix 6 armap.  */
  39
  40 bfd_boolean
  41 bfd_elf64_archive_slurp_armap (bfd *abfd)
  42 {
  43   struct artdata *ardata = bfd_ardata (abfd);
  44   char nextname[17];
  45   bfd_size_type i, parsed_size, nsymz, stringsize, carsym_size, ptrsize;
  46   struct areltdata *mapdata;
  47   bfd_byte int_buf[8];
  48   char *stringbase;
  49   char *stringend;
  50   bfd_byte *raw_armap = NULL;
  51   carsym *carsyms;
  52   bfd_size_type amt;
  53
  54   ardata->symdefs = NULL;
  55
  56   /* Get the name of the first element.  */
  57   i = bfd_bread (nextname, 16, abfd);
  58   if (i == 0)
  59     return TRUE;
  60   if (i != 16)
  61     return FALSE;
  62
  63   if (bfd_seek (abfd, (file_ptr) - 16, SEEK_CUR) != 0)
  64     return FALSE;
  65
  66   /* Archives with traditional armaps are still permitted.  */
  67   if (CONST_STRNEQ (nextname, "/               "))
  68     return bfd_slurp_armap (abfd);
  69
  70   if (! CONST_STRNEQ (nextname, "/SYM64/         "))
  71     {
  72       bfd_has_map (abfd) = FALSE;
  73       return TRUE;
  74     }
  75
  76   mapdata = (struct areltdata *) _bfd_read_ar_hdr (abfd);
  77   if (mapdata == NULL)
  78     return FALSE;
  79   parsed_size = mapdata->parsed_size;
  80   free (mapdata);
  81
  82   if (bfd_bread (int_buf, 8, abfd) != 8)
  83     {
  84       if (bfd_get_error () != bfd_error_system_call)
  85         bfd_set_error (bfd_error_malformed_archive);
  86       return FALSE;
  87     }
  88
  89   nsymz = bfd_getb64 (int_buf);
  90   stringsize = parsed_size - 8 * nsymz - 8;
  91
  92   carsym_size = nsymz * sizeof (carsym);
  93   ptrsize = 8 * nsymz;
  94
  95   amt = carsym_size + stringsize + 1;
  96   if (carsym_size < nsymz || ptrsize < nsymz || amt < nsymz)
  97     {
  98       bfd_set_error (bfd_error_malformed_archive);
  99       return FALSE;
 100     }
 101   ardata->symdefs = (struct carsym *) bfd_zalloc (abfd, amt);
 102   if (ardata->symdefs == NULL)
 103     return FALSE;
 104   carsyms = ardata->symdefs;
 105   stringbase = ((char *) ardata->symdefs) + carsym_size;
 106   stringbase[stringsize] = 0;
 107   stringend = stringbase + stringsize;
 108
 109   raw_armap = (bfd_byte *) bfd_alloc (abfd, ptrsize);
 110   if (raw_armap == NULL)
 111     goto release_symdefs;
 112
 113   if (bfd_bread (raw_armap, ptrsize, abfd) != ptrsize
 114       || bfd_bread (stringbase, stringsize, abfd) != stringsize)
 115     {
 116       if (bfd_get_error () != bfd_error_system_call)
 117         bfd_set_error (bfd_error_malformed_archive);
 118       goto release_raw_armap;
 119     }
 120
 121   for (i = 0; i < nsymz; i++)
 122     {
 123       carsyms->file_offset = bfd_getb64 (raw_armap + i * 8);
 124       carsyms->name = stringbase;
 125       if (stringbase < stringend)
 126         stringbase += strlen (stringbase) + 1;
 127       ++carsyms;
 128     }
 129   *stringbase = '\0';
 130
 131   ardata->symdef_count = nsymz;
 132   ardata->first_file_filepos = bfd_tell (abfd);
 133   /* Pad to an even boundary if you have to.  */
 134   ardata->first_file_filepos += (ardata->first_file_filepos) % 2;
 135
 136   bfd_has_map (abfd) = TRUE;
 137   bfd_release (abfd, raw_armap);
 138
 139   return TRUE;
 140
 141 release_raw_armap:
 142   bfd_release (abfd, raw_armap);
 143 release_symdefs:
 144   bfd_release (abfd, ardata->symdefs);
 145   return FALSE;
 146 }
 147
 148 /* Write out an Irix 6 armap.  The Irix 6 tools are supposed to be
 149    able to handle ordinary ELF armaps, but at least on Irix 6.2 the
 150    linker crashes.  */
 151
 152 bfd_boolean
 153 bfd_elf64_archive_write_armap (bfd *arch,
 154                                unsigned int elength,
 155                                struct orl *map,
 156                                unsigned int symbol_count,
 157                                int stridx)
 158 {
 159   unsigned int ranlibsize = (symbol_count * 8) + 8;
 160   unsigned int stringsize = stridx;
 161   unsigned int mapsize = stringsize + ranlibsize;
 162   file_ptr archive_member_file_ptr;
 163   bfd *current = arch->archive_head;
 164   unsigned int count;
 165   struct ar_hdr hdr;
 166   int padding;
 167   bfd_byte buf[8];
 168
 169   padding = BFD_ALIGN (mapsize, 8) - mapsize;
 170   mapsize += padding;
 171
 172   /* work out where the first object file will go in the archive */
 173   archive_member_file_ptr = (mapsize
 174                              + elength
 175                              + sizeof (struct ar_hdr)
 176                              + SARMAG);
 177
 178   memset (&hdr, ' ', sizeof (struct ar_hdr));
 179   memcpy (hdr.ar_name, "/SYM64/", strlen ("/SYM64/"));
 180   if (!_bfd_ar_sizepad (hdr.ar_size, sizeof (hdr.ar_size), mapsize))
 181     return FALSE;
 182   _bfd_ar_spacepad (hdr.ar_date, sizeof (hdr.ar_date), "%ld",
 183                     time (NULL));
 184   /* This, at least, is what Intel coff sets the values to.: */
 185   _bfd_ar_spacepad (hdr.ar_uid, sizeof (hdr.ar_uid), "%ld", 0);
 186   _bfd_ar_spacepad (hdr.ar_gid, sizeof (hdr.ar_gid), "%ld", 0);
 187   _bfd_ar_spacepad (hdr.ar_mode, sizeof (hdr.ar_mode), "%-7lo", 0);
 188   memcpy (hdr.ar_fmag, ARFMAG, 2);
 189
 190   /* Write the ar header for this item and the number of symbols */
 191
 192   if (bfd_bwrite (&hdr, sizeof (struct ar_hdr), arch)
 193       != sizeof (struct ar_hdr))
 194     return FALSE;
 195
 196   bfd_putb64 ((bfd_vma) symbol_count, buf);
 197   if (bfd_bwrite (buf, 8, arch) != 8)
 198     return FALSE;
 199
 200   /* Two passes, first write the file offsets for each symbol -
 201      remembering that each offset is on a two byte boundary.  */
 202
 203   /* Write out the file offset for the file associated with each
 204      symbol, and remember to keep the offsets padded out.  */
 205   count = 0;
 206   for (current = arch->archive_head;
 207        current != NULL && count < symbol_count;
 208        current = current->archive_next)
 209     {
 210       /* For each symbol which is used defined in this object, write out
 211          the object file's address in the archive.  */
 212
 213       for (;
 214            count < symbol_count && map[count].u.abfd == current;
 215            count++)
 216         {
 217           bfd_putb64 ((bfd_vma) archive_member_file_ptr, buf);
 218           if (bfd_bwrite (buf, 8, arch) != 8)
 219             return FALSE;
 220         }
 221
 222       /* Add size of this archive entry */
 223       archive_member_file_ptr += sizeof (struct ar_hdr);
 224       if (! bfd_is_thin_archive (arch))
 225         archive_member_file_ptr += arelt_size (current);
 226       /* remember about the even alignment */
 227       archive_member_file_ptr += archive_member_file_ptr % 2;
 228     }
 229
 230   /* now write the strings themselves */
 231   for (count = 0; count < symbol_count; count++)
 232     {
 233       size_t len = strlen (*map[count].name) + 1;
 234
 235       if (bfd_bwrite (*map[count].name, len, arch) != len)
 236         return FALSE;
 237     }
 238
 239   /* The spec says that this should be padded to an 8 byte boundary.
 240      However, the Irix 6.2 tools do not appear to do this.  */
 241   while (padding != 0)
 242     {
 243       if (bfd_bwrite ("", 1, arch) != 1)
 244         return FALSE;
 245       --padding;
 246     }
 247
 248   return TRUE;
 249 }