bfd/i386linux.c

   1 /* BFD back-end for linux flavored i386 a.out binaries.
   2    Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2001, 2002, 2003,
   3    2004, 2006 Free Software Foundation, Inc.
   4
   5 This file is part of BFD, the Binary File Descriptor library.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 #define TARGET_PAGE_SIZE        4096
  22 #define ZMAGIC_DISK_BLOCK_SIZE 1024
  23 #define SEGMENT_SIZE TARGET_PAGE_SIZE
  24 #define TEXT_START_ADDR 0x0
  25 #define N_SHARED_LIB(x) 0
  26
  27 #define MACHTYPE_OK(mtype) ((mtype) == M_386 || (mtype) == M_UNKNOWN)
  28
  29 #include "bfd.h"
  30 #include "sysdep.h"
  31 #include "libbfd.h"
  32 #include "aout/aout64.h"
  33 #include "aout/stab_gnu.h"
  34 #include "aout/ar.h"
  35 #include "libaout.h"           /* BFD a.out internal data structures */
  36
  37 #define DEFAULT_ARCH bfd_arch_i386
  38
  39 /* Do not "beautify" the CONCAT* macro args.  Traditional C will not
  40    remove whitespace added here, and thus will fail to concatenate
  41    the tokens.  */
  42 #define MY(OP) CONCAT2 (i386linux_,OP)
  43 #define TARGETNAME "a.out-i386-linux"
  44
  45 extern const bfd_target MY(vec);
  46
  47 /* We always generate QMAGIC files in preference to ZMAGIC files.  It
  48    would be possible to make this a linker option, if that ever
  49    becomes important.  */
  50
  51 static void MY_final_link_callback
  52   PARAMS ((bfd *, file_ptr *, file_ptr *, file_ptr *));
  53 static bfd_boolean i386linux_bfd_final_link
  54   PARAMS ((bfd *, struct bfd_link_info *));
  55 static bfd_boolean i386linux_write_object_contents PARAMS ((bfd *));
  56
  57 static bfd_boolean
  58 i386linux_bfd_final_link (abfd, info)
  59      bfd *abfd;
  60      struct bfd_link_info *info;
  61 {
  62   obj_aout_subformat (abfd) = q_magic_format;
  63   return NAME(aout,final_link) (abfd, info, MY_final_link_callback);
  64 }
  65
  66 #define MY_bfd_final_link i386linux_bfd_final_link
  67
  68 /* Set the machine type correctly.  */
  69
  70 static bfd_boolean
  71 i386linux_write_object_contents (abfd)
  72      bfd *abfd;
  73 {
  74   struct external_exec exec_bytes;
  75   struct internal_exec *execp = exec_hdr (abfd);
  76
  77   N_SET_MACHTYPE (*execp, M_386);
  78
  79   obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
  80
  81   WRITE_HEADERS(abfd, execp);
  82
  83   return TRUE;
  84 }
  85
  86 #define MY_write_object_contents i386linux_write_object_contents
  87 \f
  88 /* Code to link against Linux a.out shared libraries.  */
  89
  90 /* See if a symbol name is a reference to the global offset table.  */
  91
  92 #ifndef GOT_REF_PREFIX
  93 #define GOT_REF_PREFIX  "__GOT_"
  94 #endif
  95
  96 #define IS_GOT_SYM(name) \
  97   (strncmp (name, GOT_REF_PREFIX, sizeof GOT_REF_PREFIX - 1) == 0)
  98
  99 /* See if a symbol name is a reference to the procedure linkage table.  */
 100
 101 #ifndef PLT_REF_PREFIX
 102 #define PLT_REF_PREFIX  "__PLT_"
 103 #endif
 104
 105 #define IS_PLT_SYM(name) \
 106   (strncmp (name, PLT_REF_PREFIX, sizeof PLT_REF_PREFIX - 1) == 0)
 107
 108 /* This string is used to generate specialized error messages.  */
 109
 110 #ifndef NEEDS_SHRLIB
 111 #define NEEDS_SHRLIB "__NEEDS_SHRLIB_"
 112 #endif
 113
 114 /* This special symbol is a set vector that contains a list of
 115    pointers to fixup tables.  It will be present in any dynamically
 116    linked file.  The linker generated fixup table should also be added
 117    to the list, and it should always appear in the second slot (the
 118    first one is a dummy with a magic number that is defined in
 119    crt0.o).  */
 120
 121 #ifndef SHARABLE_CONFLICTS
 122 #define SHARABLE_CONFLICTS "__SHARABLE_CONFLICTS__"
 123 #endif
 124
 125 /* We keep a list of fixups.  The terminology is a bit strange, but
 126    each fixup contains two 32 bit numbers.  A regular fixup contains
 127    an address and a pointer, and at runtime we should store the
 128    address at the location pointed to by the pointer.  A builtin fixup
 129    contains two pointers, and we should read the address using one
 130    pointer and store it at the location pointed to by the other
 131    pointer.  Builtin fixups come into play when we have duplicate
 132    __GOT__ symbols for the same variable.  The builtin fixup will copy
 133    the GOT pointer from one over into the other.  */
 134
 135 struct fixup
 136 {
 137   struct fixup *next;
 138   struct linux_link_hash_entry *h;
 139   bfd_vma value;
 140
 141   /* Nonzero if this is a jump instruction that needs to be fixed,
 142      zero if this is just a pointer */
 143   char jump;
 144
 145   char builtin;
 146 };
 147
 148 /* We don't need a special hash table entry structure, but we do need
 149    to keep some information between linker passes, so we use a special
 150    hash table.  */
 151
 152 struct linux_link_hash_entry
 153 {
 154   struct aout_link_hash_entry root;
 155 };
 156
 157 struct linux_link_hash_table
 158 {
 159   struct aout_link_hash_table root;
 160
 161   /* First dynamic object found in link.  */
 162   bfd *dynobj;
 163
 164   /* Number of fixups.  */
 165   size_t fixup_count;
 166
 167   /* Number of builtin fixups.  */
 168   size_t local_builtins;
 169
 170   /* List of fixups.  */
 171   struct fixup *fixup_list;
 172 };
 173
 174 static struct bfd_hash_entry *linux_link_hash_newfunc
 175   PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
 176 static struct bfd_link_hash_table *linux_link_hash_table_create
 177   PARAMS ((bfd *));
 178 static struct fixup *new_fixup
 179   PARAMS ((struct bfd_link_info *, struct linux_link_hash_entry *,
 180            bfd_vma, int));
 181 static bfd_boolean linux_link_create_dynamic_sections
 182   PARAMS ((bfd *, struct bfd_link_info *));
 183 static bfd_boolean linux_add_one_symbol
 184   PARAMS ((struct bfd_link_info *, bfd *, const char *, flagword, asection *,
 185            bfd_vma, const char *, bfd_boolean, bfd_boolean,
 186            struct bfd_link_hash_entry **));
 187 static bfd_boolean linux_tally_symbols
 188   PARAMS ((struct linux_link_hash_entry *, PTR));
 189 static bfd_boolean linux_finish_dynamic_link
 190   PARAMS ((bfd *, struct bfd_link_info *));
 191
 192 /* Routine to create an entry in an Linux link hash table.  */
 193
 194 static struct bfd_hash_entry *
 195 linux_link_hash_newfunc (entry, table, string)
 196      struct bfd_hash_entry *entry;
 197      struct bfd_hash_table *table;
 198      const char *string;
 199 {
 200   struct linux_link_hash_entry *ret = (struct linux_link_hash_entry *) entry;
 201
 202   /* Allocate the structure if it has not already been allocated by a
 203      subclass.  */
 204   if (ret == (struct linux_link_hash_entry *) NULL)
 205     ret = ((struct linux_link_hash_entry *)
 206            bfd_hash_allocate (table, sizeof (struct linux_link_hash_entry)));
 207   if (ret == NULL)
 208     return (struct bfd_hash_entry *) ret;
 209
 210   /* Call the allocation method of the superclass.  */
 211   ret = ((struct linux_link_hash_entry *)
 212          NAME(aout,link_hash_newfunc) ((struct bfd_hash_entry *) ret,
 213                                        table, string));
 214   if (ret != NULL)
 215     {
 216       /* Set local fields; there aren't any.  */
 217     }
 218
 219   return (struct bfd_hash_entry *) ret;
 220 }
 221
 222 /* Create a Linux link hash table.  */
 223
 224 static struct bfd_link_hash_table *
 225 linux_link_hash_table_create (abfd)
 226      bfd *abfd;
 227 {
 228   struct linux_link_hash_table *ret;
 229   bfd_size_type amt = sizeof (struct linux_link_hash_table);
 230
 231   ret = (struct linux_link_hash_table *) bfd_alloc (abfd, amt);
 232   if (ret == (struct linux_link_hash_table *) NULL)
 233     return (struct bfd_link_hash_table *) NULL;
 234   if (!NAME(aout,link_hash_table_init) (&ret->root, abfd,
 235                                         linux_link_hash_newfunc,
 236                                         sizeof (struct linux_link_hash_entry)))
 237     {
 238       free (ret);
 239       return (struct bfd_link_hash_table *) NULL;
 240     }
 241
 242   ret->dynobj = NULL;
 243   ret->fixup_count = 0;
 244   ret->local_builtins = 0;
 245   ret->fixup_list = NULL;
 246
 247   return &ret->root.root;
 248 }
 249
 250 /* Look up an entry in a Linux link hash table.  */
 251
 252 #define linux_link_hash_lookup(table, string, create, copy, follow) \
 253   ((struct linux_link_hash_entry *) \
 254    aout_link_hash_lookup (&(table)->root, (string), (create), (copy),\
 255                           (follow)))
 256
 257 /* Traverse a Linux link hash table.  */
 258
 259 #define linux_link_hash_traverse(table, func, info)                     \
 260   (aout_link_hash_traverse                                              \
 261    (&(table)->root,                                                     \
 262     (bfd_boolean (*) PARAMS ((struct aout_link_hash_entry *, PTR))) (func), \
 263     (info)))
 264
 265 /* Get the Linux link hash table from the info structure.  This is
 266    just a cast.  */
 267
 268 #define linux_hash_table(p) ((struct linux_link_hash_table *) ((p)->hash))
 269
 270 /* Store the information for a new fixup.  */
 271
 272 static struct fixup *
 273 new_fixup (info, h, value, builtin)
 274      struct bfd_link_info *info;
 275      struct linux_link_hash_entry *h;
 276      bfd_vma value;
 277      int builtin;
 278 {
 279   struct fixup *f;
 280
 281   f = (struct fixup *) bfd_hash_allocate (&info->hash->table,
 282                                           sizeof (struct fixup));
 283   if (f == NULL)
 284     return f;
 285   f->next = linux_hash_table (info)->fixup_list;
 286   linux_hash_table (info)->fixup_list = f;
 287   f->h = h;
 288   f->value = value;
 289   f->builtin = builtin;
 290   f->jump = 0;
 291   ++linux_hash_table (info)->fixup_count;
 292   return f;
 293 }
 294
 295 /* We come here once we realize that we are going to link to a shared
 296    library.  We need to create a special section that contains the
 297    fixup table, and we ultimately need to add a pointer to this into
 298    the set vector for SHARABLE_CONFLICTS.  At this point we do not
 299    know the size of the section, but that's OK - we just need to
 300    create it for now.  */
 301
 302 static bfd_boolean
 303 linux_link_create_dynamic_sections (abfd, info)
 304      bfd *abfd;
 305      struct bfd_link_info *info ATTRIBUTE_UNUSED;
 306 {
 307   flagword flags;
 308   register asection *s;
 309
 310   /* Note that we set the SEC_IN_MEMORY flag.  */
 311   flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
 312
 313   /* We choose to use the name ".linux-dynamic" for the fixup table.
 314      Why not? */
 315   s = bfd_make_section (abfd, ".linux-dynamic");
 316   if (s == NULL
 317       || ! bfd_set_section_flags (abfd, s, flags)
 318       || ! bfd_set_section_alignment (abfd, s, 2))
 319     return FALSE;
 320   s->size = 0;
 321   s->contents = 0;
 322
 323   return TRUE;
 324 }
 325
 326 /* Function to add a single symbol to the linker hash table.  This is
 327    a wrapper around _bfd_generic_link_add_one_symbol which handles the
 328    tweaking needed for dynamic linking support.  */
 329
 330 static bfd_boolean
 331 linux_add_one_symbol (info, abfd, name, flags, section, value, string,
 332                       copy, collect, hashp)
 333      struct bfd_link_info *info;
 334      bfd *abfd;
 335      const char *name;
 336      flagword flags;
 337      asection *section;
 338      bfd_vma value;
 339      const char *string;
 340      bfd_boolean copy;
 341      bfd_boolean collect;
 342      struct bfd_link_hash_entry **hashp;
 343 {
 344   struct linux_link_hash_entry *h;
 345   bfd_boolean insert;
 346
 347   /* Look up and see if we already have this symbol in the hash table.
 348      If we do, and the defining entry is from a shared library, we
 349      need to create the dynamic sections.
 350
 351      FIXME: What if abfd->xvec != info->hash->creator?  We may want to
 352      be able to link Linux a.out and ELF objects together, but serious
 353      confusion is possible.  */
 354
 355   insert = FALSE;
 356
 357   if (! info->relocatable
 358       && linux_hash_table (info)->dynobj == NULL
 359       && strcmp (name, SHARABLE_CONFLICTS) == 0
 360       && (flags & BSF_CONSTRUCTOR) != 0
 361       && abfd->xvec == info->hash->creator)
 362     {
 363       if (! linux_link_create_dynamic_sections (abfd, info))
 364         return FALSE;
 365       linux_hash_table (info)->dynobj = abfd;
 366       insert = TRUE;
 367     }
 368
 369   if (bfd_is_abs_section (section)
 370       && abfd->xvec == info->hash->creator)
 371     {
 372       h = linux_link_hash_lookup (linux_hash_table (info), name, FALSE,
 373                                   FALSE, FALSE);
 374       if (h != NULL
 375           && (h->root.root.type == bfd_link_hash_defined
 376               || h->root.root.type == bfd_link_hash_defweak))
 377         {
 378           struct fixup *f;
 379
 380           if (hashp != NULL)
 381             *hashp = (struct bfd_link_hash_entry *) h;
 382
 383           f = new_fixup (info, h, value, ! IS_PLT_SYM (name));
 384           if (f == NULL)
 385             return FALSE;
 386           f->jump = IS_PLT_SYM (name);
 387
 388           return TRUE;
 389         }
 390     }
 391
 392   /* Do the usual procedure for adding a symbol.  */
 393   if (! _bfd_generic_link_add_one_symbol (info, abfd, name, flags, section,
 394                                           value, string, copy, collect,
 395                                           hashp))
 396     return FALSE;
 397
 398   /* Insert a pointer to our table in the set vector.  The dynamic
 399      linker requires this information */
 400   if (insert)
 401     {
 402       asection *s;
 403
 404       /* Here we do our special thing to add the pointer to the
 405          dynamic section in the SHARABLE_CONFLICTS set vector.  */
 406       s = bfd_get_section_by_name (linux_hash_table (info)->dynobj,
 407                                    ".linux-dynamic");
 408       BFD_ASSERT (s != NULL);
 409
 410       if (! (_bfd_generic_link_add_one_symbol
 411              (info, linux_hash_table (info)->dynobj, SHARABLE_CONFLICTS,
 412               BSF_GLOBAL | BSF_CONSTRUCTOR, s, (bfd_vma) 0, NULL,
 413               FALSE, FALSE, NULL)))
 414         return FALSE;
 415     }
 416
 417   return TRUE;
 418 }
 419
 420 /* We will crawl the hash table and come here for every global symbol.
 421    We will examine each entry and see if there are indications that we
 422    need to add a fixup.  There are two possible cases - one is where
 423    you have duplicate definitions of PLT or GOT symbols - these will
 424    have already been caught and added as "builtin" fixups.  If we find
 425    that the corresponding non PLT/GOT symbol is also present, we
 426    convert it to a regular fixup instead.
 427
 428    This function is called via linux_link_hash_traverse.  */
 429
 430 static bfd_boolean
 431 linux_tally_symbols (h, data)
 432      struct linux_link_hash_entry *h;
 433      PTR data;
 434 {
 435   struct bfd_link_info *info = (struct bfd_link_info *) data;
 436   struct fixup *f, *f1;
 437   int is_plt;
 438   struct linux_link_hash_entry *h1, *h2;
 439   bfd_boolean exists;
 440
 441   if (h->root.root.type == bfd_link_hash_warning)
 442     h = (struct linux_link_hash_entry *) h->root.root.u.i.link;
 443
 444   if (h->root.root.type == bfd_link_hash_undefined
 445       && strncmp (h->root.root.root.string, NEEDS_SHRLIB,
 446                   sizeof NEEDS_SHRLIB - 1) == 0)
 447     {
 448       const char *name;
 449       char *p;
 450       char *alloc = NULL;
 451
 452       name = h->root.root.root.string + sizeof NEEDS_SHRLIB - 1;
 453       p = strrchr (name, '_');
 454       if (p != NULL)
 455         alloc = (char *) bfd_malloc ((bfd_size_type) strlen (name) + 1);
 456
 457       if (p == NULL || alloc == NULL)
 458         (*_bfd_error_handler) (_("Output file requires shared library `%s'\n"),
 459                                name);
 460       else
 461         {
 462           strcpy (alloc, name);
 463           p = strrchr (alloc, '_');
 464           *p++ = '\0';
 465           (*_bfd_error_handler)
 466             (_("Output file requires shared library `%s.so.%s'\n"),
 467              alloc, p);
 468           free (alloc);
 469         }
 470
 471       abort ();
 472     }
 473
 474   /* If this symbol is not a PLT/GOT, we do not even need to look at it */
 475   is_plt = IS_PLT_SYM (h->root.root.root.string);
 476
 477   if (is_plt || IS_GOT_SYM (h->root.root.root.string))
 478     {
 479       /* Look up this symbol twice.  Once just as a regular lookup,
 480          and then again following all of the indirect links until we
 481          reach a real symbol.  */
 482       h1 = linux_link_hash_lookup (linux_hash_table (info),
 483                                    (h->root.root.root.string
 484                                     + sizeof PLT_REF_PREFIX - 1),
 485                                    FALSE, FALSE, TRUE);
 486       /* h2 does not follow indirect symbols. */
 487       h2 = linux_link_hash_lookup (linux_hash_table (info),
 488                                    (h->root.root.root.string
 489                                     + sizeof PLT_REF_PREFIX - 1),
 490                                    FALSE, FALSE, FALSE);
 491
 492       /* The real symbol must exist but if it is also an ABS symbol,
 493          there is no need to have a fixup.  This is because they both
 494          came from the same library.  If on the other hand, we had to
 495          use an indirect symbol to get to the real symbol, we add the
 496          fixup anyway, since there are cases where these symbols come
 497          from different shared libraries */
 498       if (h1 != NULL
 499           && (((h1->root.root.type == bfd_link_hash_defined
 500                 || h1->root.root.type == bfd_link_hash_defweak)
 501                && ! bfd_is_abs_section (h1->root.root.u.def.section))
 502               || h2->root.root.type == bfd_link_hash_indirect))
 503         {
 504           /* See if there is a "builtin" fixup already present
 505              involving this symbol.  If so, convert it to a regular
 506              fixup.  In the end, this relaxes some of the requirements
 507              about the order of performing fixups.  */
 508           exists = FALSE;
 509           for (f1 = linux_hash_table (info)->fixup_list;
 510                f1 != NULL;
 511                f1 = f1->next)
 512             {
 513               if ((f1->h != h && f1->h != h1)
 514                   || (! f1->builtin && ! f1->jump))
 515                 continue;
 516               if (f1->h == h1)
 517                 exists = TRUE;
 518               if (! exists
 519                   && bfd_is_abs_section (h->root.root.u.def.section))
 520                 {
 521                   f = new_fixup (info, h1, f1->h->root.root.u.def.value, 0);
 522                   f->jump = is_plt;
 523                 }
 524               f1->h = h1;
 525               f1->jump = is_plt;
 526               f1->builtin = 0;
 527               exists = TRUE;
 528             }
 529           if (! exists
 530               && bfd_is_abs_section (h->root.root.u.def.section))
 531             {
 532               f = new_fixup (info, h1, h->root.root.u.def.value, 0);
 533               if (f == NULL)
 534                 {
 535                   /* FIXME: No way to return error.  */
 536                   abort ();
 537                 }
 538               f->jump = is_plt;
 539             }
 540         }
 541
 542       /* Quick and dirty way of stripping these symbols from the
 543          symtab. */
 544       if (bfd_is_abs_section (h->root.root.u.def.section))
 545         h->root.written = TRUE;
 546     }
 547
 548   return TRUE;
 549 }
 550
 551 /* This is called to set the size of the .linux-dynamic section is.
 552    It is called by the Linux linker emulation before_allocation
 553    routine.  We have finished reading all of the input files, and now
 554    we just scan the hash tables to find out how many additional fixups
 555    are required.  */
 556
 557 bfd_boolean
 558 bfd_i386linux_size_dynamic_sections (output_bfd, info)
 559      bfd *output_bfd;
 560      struct bfd_link_info *info;
 561 {
 562   struct fixup *f;
 563   asection *s;
 564
 565   if (output_bfd->xvec != &MY(vec))
 566     return TRUE;
 567
 568   /* First find the fixups... */
 569   linux_link_hash_traverse (linux_hash_table (info),
 570                             linux_tally_symbols,
 571                             (PTR) info);
 572
 573   /* If there are builtin fixups, leave room for a marker.  This is
 574      used by the dynamic linker so that it knows that all that follow
 575      are builtin fixups instead of regular fixups.  */
 576   for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next)
 577     {
 578       if (f->builtin)
 579         {
 580           ++linux_hash_table (info)->fixup_count;
 581           ++linux_hash_table (info)->local_builtins;
 582           break;
 583         }
 584     }
 585
 586   if (linux_hash_table (info)->dynobj == NULL)
 587     {
 588       if (linux_hash_table (info)->fixup_count > 0)
 589         abort ();
 590       return TRUE;
 591     }
 592
 593   /* Allocate memory for our fixup table.  We will fill it in later.  */
 594   s = bfd_get_section_by_name (linux_hash_table (info)->dynobj,
 595                                ".linux-dynamic");
 596   if (s != NULL)
 597     {
 598       s->size = linux_hash_table (info)->fixup_count + 1;
 599       s->size *= 8;
 600       s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->size);
 601       if (s->contents == NULL)
 602         return FALSE;
 603     }
 604
 605   return TRUE;
 606 }
 607
 608 /* We come here once we are ready to actually write the fixup table to
 609    the output file.  Scan the fixup tables and so forth and generate
 610    the stuff we need.  */
 611
 612 static bfd_boolean
 613 linux_finish_dynamic_link (output_bfd, info)
 614      bfd *output_bfd;
 615      struct bfd_link_info *info;
 616 {
 617   asection *s, *os, *is;
 618   bfd_byte *fixup_table;
 619   struct linux_link_hash_entry *h;
 620   struct fixup *f;
 621   unsigned int new_addr;
 622   int section_offset;
 623   unsigned int fixups_written;
 624
 625   if (linux_hash_table (info)->dynobj == NULL)
 626     return TRUE;
 627
 628   s = bfd_get_section_by_name (linux_hash_table (info)->dynobj,
 629                                ".linux-dynamic");
 630   BFD_ASSERT (s != NULL);
 631   os = s->output_section;
 632   fixups_written = 0;
 633
 634 #ifdef LINUX_LINK_DEBUG
 635   printf ("Fixup table file offset: %x  VMA: %x\n",
 636           os->filepos + s->output_offset,
 637           os->vma + s->output_offset);
 638 #endif
 639
 640   fixup_table = s->contents;
 641   bfd_put_32 (output_bfd,
 642               (bfd_vma) linux_hash_table (info)->fixup_count, fixup_table);
 643   fixup_table += 4;
 644
 645   /* Fill in fixup table.  */
 646   for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next)
 647     {
 648       if (f->builtin)
 649         continue;
 650
 651       if (f->h->root.root.type != bfd_link_hash_defined
 652           && f->h->root.root.type != bfd_link_hash_defweak)
 653         {
 654           (*_bfd_error_handler)
 655             (_("Symbol %s not defined for fixups\n"),
 656              f->h->root.root.root.string);
 657           continue;
 658         }
 659
 660       is = f->h->root.root.u.def.section;
 661       section_offset = is->output_section->vma + is->output_offset;
 662       new_addr = f->h->root.root.u.def.value + section_offset;
 663
 664 #ifdef LINUX_LINK_DEBUG
 665       printf ("Fixup(%d) %s: %x %x\n",f->jump, f->h->root.root.string,
 666               new_addr, f->value);
 667 #endif
 668
 669       if (f->jump)
 670         {
 671           /* Relative address */
 672           new_addr = new_addr - (f->value + 5);
 673           bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table);
 674           fixup_table += 4;
 675           bfd_put_32 (output_bfd, f->value + 1, fixup_table);
 676           fixup_table += 4;
 677         }
 678       else
 679         {
 680           bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table);
 681           fixup_table += 4;
 682           bfd_put_32 (output_bfd, f->value, fixup_table);
 683           fixup_table += 4;
 684         }
 685       ++fixups_written;
 686     }
 687
 688   if (linux_hash_table (info)->local_builtins != 0)
 689     {
 690       /* Special marker so we know to switch to the other type of fixup */
 691       bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table);
 692       fixup_table += 4;
 693       bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table);
 694       fixup_table += 4;
 695       ++fixups_written;
 696       for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next)
 697         {
 698           if (! f->builtin)
 699             continue;
 700
 701           if (f->h->root.root.type != bfd_link_hash_defined
 702               && f->h->root.root.type != bfd_link_hash_defweak)
 703             {
 704               (*_bfd_error_handler)
 705                 (_("Symbol %s not defined for fixups\n"),
 706                  f->h->root.root.root.string);
 707               continue;
 708             }
 709
 710           is = f->h->root.root.u.def.section;
 711           section_offset = is->output_section->vma + is->output_offset;
 712           new_addr = f->h->root.root.u.def.value + section_offset;
 713
 714 #ifdef LINUX_LINK_DEBUG
 715           printf ("Fixup(B) %s: %x %x\n", f->h->root.root.string,
 716                   new_addr, f->value);
 717 #endif
 718
 719           bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table);
 720           fixup_table += 4;
 721           bfd_put_32 (output_bfd, f->value, fixup_table);
 722           fixup_table += 4;
 723           ++fixups_written;
 724         }
 725   }
 726
 727   if (linux_hash_table (info)->fixup_count != fixups_written)
 728     {
 729       (*_bfd_error_handler) (_("Warning: fixup count mismatch\n"));
 730       while (linux_hash_table (info)->fixup_count > fixups_written)
 731         {
 732           bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table);
 733           fixup_table += 4;
 734           bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table);
 735           fixup_table += 4;
 736           ++fixups_written;
 737         }
 738     }
 739
 740   h = linux_link_hash_lookup (linux_hash_table (info),
 741                               "__BUILTIN_FIXUPS__",
 742                               FALSE, FALSE, FALSE);
 743
 744   if (h != NULL
 745       && (h->root.root.type == bfd_link_hash_defined
 746           || h->root.root.type == bfd_link_hash_defweak))
 747     {
 748       is = h->root.root.u.def.section;
 749       section_offset = is->output_section->vma + is->output_offset;
 750       new_addr = h->root.root.u.def.value + section_offset;
 751
 752 #ifdef LINUX_LINK_DEBUG
 753       printf ("Builtin fixup table at %x\n", new_addr);
 754 #endif
 755
 756       bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table);
 757     }
 758   else
 759     bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table);
 760
 761   if (bfd_seek (output_bfd, (file_ptr) (os->filepos + s->output_offset),
 762                 SEEK_SET) != 0)
 763     return FALSE;
 764
 765   if (bfd_bwrite ((PTR) s->contents, s->size, output_bfd) != s->size)
 766     return FALSE;
 767
 768   return TRUE;
 769 }
 770
 771 #define MY_bfd_link_hash_table_create linux_link_hash_table_create
 772 #define MY_add_one_symbol linux_add_one_symbol
 773 #define MY_finish_dynamic_link linux_finish_dynamic_link
 774
 775 #define MY_zmagic_contiguous 1
 776
 777 #include "aout-target.h"