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, 2007 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 3 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,
  20    MA 02110-1301, USA.  */
  21
  22 #define TARGET_PAGE_SIZE        4096
  23 #define ZMAGIC_DISK_BLOCK_SIZE 1024
  24 #define SEGMENT_SIZE TARGET_PAGE_SIZE
  25 #define TEXT_START_ADDR 0x0
  26 #define N_SHARED_LIB(x) 0
  27
  28 #define MACHTYPE_OK(mtype) ((mtype) == M_386 || (mtype) == M_UNKNOWN)
  29
  30 #include "sysdep.h"
  31 #include "bfd.h"
  32 #include "libbfd.h"
  33 #include "aout/aout64.h"
  34 #include "aout/stab_gnu.h"
  35 #include "aout/ar.h"
  36 #include "libaout.h"           /* BFD a.out internal data structures */
  37
  38 #define DEFAULT_ARCH bfd_arch_i386
  39
  40 /* Do not "beautify" the CONCAT* macro args.  Traditional C will not
  41    remove whitespace added here, and thus will fail to concatenate
  42    the tokens.  */
  43 #define MY(OP) CONCAT2 (i386linux_,OP)
  44 #define TARGETNAME "a.out-i386-linux"
  45
  46 extern const bfd_target MY(vec);
  47
  48 /* We always generate QMAGIC files in preference to ZMAGIC files.  It
  49    would be possible to make this a linker option, if that ever
  50    becomes important.  */
  51
  52 static void MY_final_link_callback
  53   PARAMS ((bfd *, file_ptr *, file_ptr *, file_ptr *));
  54 static bfd_boolean i386linux_bfd_final_link
  55   PARAMS ((bfd *, struct bfd_link_info *));
  56 static bfd_boolean i386linux_write_object_contents PARAMS ((bfd *));
  57
  58 static bfd_boolean
  59 i386linux_bfd_final_link (abfd, info)
  60      bfd *abfd;
  61      struct bfd_link_info *info;
  62 {
  63   obj_aout_subformat (abfd) = q_magic_format;
  64   return NAME(aout,final_link) (abfd, info, MY_final_link_callback);
  65 }
  66
  67 #define MY_bfd_final_link i386linux_bfd_final_link
  68
  69 /* Set the machine type correctly.  */
  70
  71 static bfd_boolean
  72 i386linux_write_object_contents (abfd)
  73      bfd *abfd;
  74 {
  75   struct external_exec exec_bytes;
  76   struct internal_exec *execp = exec_hdr (abfd);
  77
  78   N_SET_MACHTYPE (*execp, M_386);
  79
  80   obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
  81
  82   WRITE_HEADERS(abfd, execp);
  83
  84   return TRUE;
  85 }
  86
  87 #define MY_write_object_contents i386linux_write_object_contents
  88 \f
  89 /* Code to link against Linux a.out shared libraries.  */
  90
  91 /* See if a symbol name is a reference to the global offset table.  */
  92
  93 #ifndef GOT_REF_PREFIX
  94 #define GOT_REF_PREFIX  "__GOT_"
  95 #endif
  96
  97 #define IS_GOT_SYM(name)   (CONST_STRNEQ (name, GOT_REF_PREFIX))
  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)  (CONST_STRNEQ (name, PLT_REF_PREFIX))
 106
 107 /* This string is used to generate specialized error messages.  */
 108
 109 #ifndef NEEDS_SHRLIB
 110 #define NEEDS_SHRLIB "__NEEDS_SHRLIB_"
 111 #endif
 112
 113 /* This special symbol is a set vector that contains a list of
 114    pointers to fixup tables.  It will be present in any dynamically
 115    linked file.  The linker generated fixup table should also be added
 116    to the list, and it should always appear in the second slot (the
 117    first one is a dummy with a magic number that is defined in
 118    crt0.o).  */
 119
 120 #ifndef SHARABLE_CONFLICTS
 121 #define SHARABLE_CONFLICTS "__SHARABLE_CONFLICTS__"
 122 #endif
 123
 124 /* We keep a list of fixups.  The terminology is a bit strange, but
 125    each fixup contains two 32 bit numbers.  A regular fixup contains
 126    an address and a pointer, and at runtime we should store the
 127    address at the location pointed to by the pointer.  A builtin fixup
 128    contains two pointers, and we should read the address using one
 129    pointer and store it at the location pointed to by the other
 130    pointer.  Builtin fixups come into play when we have duplicate
 131    __GOT__ symbols for the same variable.  The builtin fixup will copy
 132    the GOT pointer from one over into the other.  */
 133
 134 struct fixup
 135 {
 136   struct fixup *next;
 137   struct linux_link_hash_entry *h;
 138   bfd_vma value;
 139
 140   /* Nonzero if this is a jump instruction that needs to be fixed,
 141      zero if this is just a pointer */
 142   char jump;
 143
 144   char builtin;
 145 };
 146
 147 /* We don't need a special hash table entry structure, but we do need
 148    to keep some information between linker passes, so we use a special
 149    hash table.  */
 150
 151 struct linux_link_hash_entry
 152 {
 153   struct aout_link_hash_entry root;
 154 };
 155
 156 struct linux_link_hash_table
 157 {
 158   struct aout_link_hash_table root;
 159
 160   /* First dynamic object found in link.  */
 161   bfd *dynobj;
 162
 163   /* Number of fixups.  */
 164   size_t fixup_count;
 165
 166   /* Number of builtin fixups.  */
 167   size_t local_builtins;
 168
 169   /* List of fixups.  */
 170   struct fixup *fixup_list;
 171 };
 172
 173 static struct bfd_hash_entry *linux_link_hash_newfunc
 174   PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
 175 static struct bfd_link_hash_table *linux_link_hash_table_create
 176   PARAMS ((bfd *));
 177 static struct fixup *new_fixup
 178   PARAMS ((struct bfd_link_info *, struct linux_link_hash_entry *,
 179            bfd_vma, int));
 180 static bfd_boolean linux_link_create_dynamic_sections
 181   PARAMS ((bfd *, struct bfd_link_info *));
 182 static bfd_boolean linux_add_one_symbol
 183   PARAMS ((struct bfd_link_info *, bfd *, const char *, flagword, asection *,
 184            bfd_vma, const char *, bfd_boolean, bfd_boolean,
 185            struct bfd_link_hash_entry **));
 186 static bfd_boolean linux_tally_symbols
 187   PARAMS ((struct linux_link_hash_entry *, PTR));
 188 static bfd_boolean linux_finish_dynamic_link
 189   PARAMS ((bfd *, struct bfd_link_info *));
 190
 191 /* Routine to create an entry in an Linux link hash table.  */
 192
 193 static struct bfd_hash_entry *
 194 linux_link_hash_newfunc (entry, table, string)
 195      struct bfd_hash_entry *entry;
 196      struct bfd_hash_table *table;
 197      const char *string;
 198 {
 199   struct linux_link_hash_entry *ret = (struct linux_link_hash_entry *) entry;
 200
 201   /* Allocate the structure if it has not already been allocated by a
 202      subclass.  */
 203   if (ret == (struct linux_link_hash_entry *) NULL)
 204     ret = ((struct linux_link_hash_entry *)
 205            bfd_hash_allocate (table, sizeof (struct linux_link_hash_entry)));
 206   if (ret == NULL)
 207     return (struct bfd_hash_entry *) ret;
 208
 209   /* Call the allocation method of the superclass.  */
 210   ret = ((struct linux_link_hash_entry *)
 211          NAME(aout,link_hash_newfunc) ((struct bfd_hash_entry *) ret,
 212                                        table, string));
 213   if (ret != NULL)
 214     {
 215       /* Set local fields; there aren't any.  */
 216     }
 217
 218   return (struct bfd_hash_entry *) ret;
 219 }
 220
 221 /* Create a Linux link hash table.  */
 222
 223 static struct bfd_link_hash_table *
 224 linux_link_hash_table_create (abfd)
 225      bfd *abfd;
 226 {
 227   struct linux_link_hash_table *ret;
 228   bfd_size_type amt = sizeof (struct linux_link_hash_table);
 229
 230   ret = (struct linux_link_hash_table *) bfd_alloc (abfd, amt);
 231   if (ret == (struct linux_link_hash_table *) NULL)
 232     return (struct bfd_link_hash_table *) NULL;
 233   if (!NAME(aout,link_hash_table_init) (&ret->root, abfd,
 234                                         linux_link_hash_newfunc,
 235                                         sizeof (struct linux_link_hash_entry)))
 236     {
 237       free (ret);
 238       return (struct bfd_link_hash_table *) NULL;
 239     }
 240
 241   ret->dynobj = NULL;
 242   ret->fixup_count = 0;
 243   ret->local_builtins = 0;
 244   ret->fixup_list = NULL;
 245
 246   return &ret->root.root;
 247 }
 248
 249 /* Look up an entry in a Linux link hash table.  */
 250
 251 #define linux_link_hash_lookup(table, string, create, copy, follow) \
 252   ((struct linux_link_hash_entry *) \
 253    aout_link_hash_lookup (&(table)->root, (string), (create), (copy),\
 254                           (follow)))
 255
 256 /* Traverse a Linux link hash table.  */
 257
 258 #define linux_link_hash_traverse(table, func, info)                     \
 259   (aout_link_hash_traverse                                              \
 260    (&(table)->root,                                                     \
 261     (bfd_boolean (*) PARAMS ((struct aout_link_hash_entry *, PTR))) (func), \
 262     (info)))
 263
 264 /* Get the Linux link hash table from the info structure.  This is
 265    just a cast.  */
 266
 267 #define linux_hash_table(p) ((struct linux_link_hash_table *) ((p)->hash))
 268
 269 /* Store the information for a new fixup.  */
 270
 271 static struct fixup *
 272 new_fixup (info, h, value, builtin)
 273      struct bfd_link_info *info;
 274      struct linux_link_hash_entry *h;
 275      bfd_vma value;
 276      int builtin;
 277 {
 278   struct fixup *f;
 279
 280   f = (struct fixup *) bfd_hash_allocate (&info->hash->table,
 281                                           sizeof (struct fixup));
 282   if (f == NULL)
 283     return f;
 284   f->next = linux_hash_table (info)->fixup_list;
 285   linux_hash_table (info)->fixup_list = f;
 286   f->h = h;
 287   f->value = value;
 288   f->builtin = builtin;
 289   f->jump = 0;
 290   ++linux_hash_table (info)->fixup_count;
 291   return f;
 292 }
 293
 294 /* We come here once we realize that we are going to link to a shared
 295    library.  We need to create a special section that contains the
 296    fixup table, and we ultimately need to add a pointer to this into
 297    the set vector for SHARABLE_CONFLICTS.  At this point we do not
 298    know the size of the section, but that's OK - we just need to
 299    create it for now.  */
 300
 301 static bfd_boolean
 302 linux_link_create_dynamic_sections (abfd, info)
 303      bfd *abfd;
 304      struct bfd_link_info *info ATTRIBUTE_UNUSED;
 305 {
 306   flagword flags;
 307   register asection *s;
 308
 309   /* Note that we set the SEC_IN_MEMORY flag.  */
 310   flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
 311
 312   /* We choose to use the name ".linux-dynamic" for the fixup table.
 313      Why not? */
 314   s = bfd_make_section_with_flags (abfd, ".linux-dynamic", flags);
 315   if (s == NULL
 316       || ! bfd_set_section_alignment (abfd, s, 2))
 317     return FALSE;
 318   s->size = 0;
 319   s->contents = 0;
 320
 321   return TRUE;
 322 }
 323
 324 /* Function to add a single symbol to the linker hash table.  This is
 325    a wrapper around _bfd_generic_link_add_one_symbol which handles the
 326    tweaking needed for dynamic linking support.  */
 327
 328 static bfd_boolean
 329 linux_add_one_symbol (info, abfd, name, flags, section, value, string,
 330                       copy, collect, hashp)
 331      struct bfd_link_info *info;
 332      bfd *abfd;
 333      const char *name;
 334      flagword flags;
 335      asection *section;
 336      bfd_vma value;
 337      const char *string;
 338      bfd_boolean copy;
 339      bfd_boolean collect;
 340      struct bfd_link_hash_entry **hashp;
 341 {
 342   struct linux_link_hash_entry *h;
 343   bfd_boolean insert;
 344
 345   /* Look up and see if we already have this symbol in the hash table.
 346      If we do, and the defining entry is from a shared library, we
 347      need to create the dynamic sections.
 348
 349      FIXME: What if abfd->xvec != info->hash->creator?  We may want to
 350      be able to link Linux a.out and ELF objects together, but serious
 351      confusion is possible.  */
 352
 353   insert = FALSE;
 354
 355   if (! info->relocatable
 356       && linux_hash_table (info)->dynobj == NULL
 357       && strcmp (name, SHARABLE_CONFLICTS) == 0
 358       && (flags & BSF_CONSTRUCTOR) != 0
 359       && abfd->xvec == info->hash->creator)
 360     {
 361       if (! linux_link_create_dynamic_sections (abfd, info))
 362         return FALSE;
 363       linux_hash_table (info)->dynobj = abfd;
 364       insert = TRUE;
 365     }
 366
 367   if (bfd_is_abs_section (section)
 368       && abfd->xvec == info->hash->creator)
 369     {
 370       h = linux_link_hash_lookup (linux_hash_table (info), name, FALSE,
 371                                   FALSE, FALSE);
 372       if (h != NULL
 373           && (h->root.root.type == bfd_link_hash_defined
 374               || h->root.root.type == bfd_link_hash_defweak))
 375         {
 376           struct fixup *f;
 377
 378           if (hashp != NULL)
 379             *hashp = (struct bfd_link_hash_entry *) h;
 380
 381           f = new_fixup (info, h, value, ! IS_PLT_SYM (name));
 382           if (f == NULL)
 383             return FALSE;
 384           f->jump = IS_PLT_SYM (name);
 385
 386           return TRUE;
 387         }
 388     }
 389
 390   /* Do the usual procedure for adding a symbol.  */
 391   if (! _bfd_generic_link_add_one_symbol (info, abfd, name, flags, section,
 392                                           value, string, copy, collect,
 393                                           hashp))
 394     return FALSE;
 395
 396   /* Insert a pointer to our table in the set vector.  The dynamic
 397      linker requires this information */
 398   if (insert)
 399     {
 400       asection *s;
 401
 402       /* Here we do our special thing to add the pointer to the
 403          dynamic section in the SHARABLE_CONFLICTS set vector.  */
 404       s = bfd_get_section_by_name (linux_hash_table (info)->dynobj,
 405                                    ".linux-dynamic");
 406       BFD_ASSERT (s != NULL);
 407
 408       if (! (_bfd_generic_link_add_one_symbol
 409              (info, linux_hash_table (info)->dynobj, SHARABLE_CONFLICTS,
 410               BSF_GLOBAL | BSF_CONSTRUCTOR, s, (bfd_vma) 0, NULL,
 411               FALSE, FALSE, NULL)))
 412         return FALSE;
 413     }
 414
 415   return TRUE;
 416 }
 417
 418 /* We will crawl the hash table and come here for every global symbol.
 419    We will examine each entry and see if there are indications that we
 420    need to add a fixup.  There are two possible cases - one is where
 421    you have duplicate definitions of PLT or GOT symbols - these will
 422    have already been caught and added as "builtin" fixups.  If we find
 423    that the corresponding non PLT/GOT symbol is also present, we
 424    convert it to a regular fixup instead.
 425
 426    This function is called via linux_link_hash_traverse.  */
 427
 428 static bfd_boolean
 429 linux_tally_symbols (h, data)
 430      struct linux_link_hash_entry *h;
 431      PTR data;
 432 {
 433   struct bfd_link_info *info = (struct bfd_link_info *) data;
 434   struct fixup *f, *f1;
 435   int is_plt;
 436   struct linux_link_hash_entry *h1, *h2;
 437   bfd_boolean exists;
 438
 439   if (h->root.root.type == bfd_link_hash_warning)
 440     h = (struct linux_link_hash_entry *) h->root.root.u.i.link;
 441
 442   if (h->root.root.type == bfd_link_hash_undefined
 443       && CONST_STRNEQ (h->root.root.root.string, NEEDS_SHRLIB))
 444     {
 445       const char *name;
 446       char *p;
 447       char *alloc = NULL;
 448
 449       name = h->root.root.root.string + sizeof NEEDS_SHRLIB - 1;
 450       p = strrchr (name, '_');
 451       if (p != NULL)
 452         alloc = (char *) bfd_malloc ((bfd_size_type) strlen (name) + 1);
 453
 454       if (p == NULL || alloc == NULL)
 455         (*_bfd_error_handler) (_("Output file requires shared library `%s'\n"),
 456                                name);
 457       else
 458         {
 459           strcpy (alloc, name);
 460           p = strrchr (alloc, '_');
 461           *p++ = '\0';
 462           (*_bfd_error_handler)
 463             (_("Output file requires shared library `%s.so.%s'\n"),
 464              alloc, p);
 465           free (alloc);
 466         }
 467
 468       abort ();
 469     }
 470
 471   /* If this symbol is not a PLT/GOT, we do not even need to look at it */
 472   is_plt = IS_PLT_SYM (h->root.root.root.string);
 473
 474   if (is_plt || IS_GOT_SYM (h->root.root.root.string))
 475     {
 476       /* Look up this symbol twice.  Once just as a regular lookup,
 477          and then again following all of the indirect links until we
 478          reach a real symbol.  */
 479       h1 = linux_link_hash_lookup (linux_hash_table (info),
 480                                    (h->root.root.root.string
 481                                     + sizeof PLT_REF_PREFIX - 1),
 482                                    FALSE, FALSE, TRUE);
 483       /* h2 does not follow indirect symbols. */
 484       h2 = linux_link_hash_lookup (linux_hash_table (info),
 485                                    (h->root.root.root.string
 486                                     + sizeof PLT_REF_PREFIX - 1),
 487                                    FALSE, FALSE, FALSE);
 488
 489       /* The real symbol must exist but if it is also an ABS symbol,
 490          there is no need to have a fixup.  This is because they both
 491          came from the same library.  If on the other hand, we had to
 492          use an indirect symbol to get to the real symbol, we add the
 493          fixup anyway, since there are cases where these symbols come
 494          from different shared libraries */
 495       if (h1 != NULL
 496           && (((h1->root.root.type == bfd_link_hash_defined
 497                 || h1->root.root.type == bfd_link_hash_defweak)
 498                && ! bfd_is_abs_section (h1->root.root.u.def.section))
 499               || h2->root.root.type == bfd_link_hash_indirect))
 500         {
 501           /* See if there is a "builtin" fixup already present
 502              involving this symbol.  If so, convert it to a regular
 503              fixup.  In the end, this relaxes some of the requirements
 504              about the order of performing fixups.  */
 505           exists = FALSE;
 506           for (f1 = linux_hash_table (info)->fixup_list;
 507                f1 != NULL;
 508                f1 = f1->next)
 509             {
 510               if ((f1->h != h && f1->h != h1)
 511                   || (! f1->builtin && ! f1->jump))
 512                 continue;
 513               if (f1->h == h1)
 514                 exists = TRUE;
 515               if (! exists
 516                   && bfd_is_abs_section (h->root.root.u.def.section))
 517                 {
 518                   f = new_fixup (info, h1, f1->h->root.root.u.def.value, 0);
 519                   f->jump = is_plt;
 520                 }
 521               f1->h = h1;
 522               f1->jump = is_plt;
 523               f1->builtin = 0;
 524               exists = TRUE;
 525             }
 526           if (! exists
 527               && bfd_is_abs_section (h->root.root.u.def.section))
 528             {
 529               f = new_fixup (info, h1, h->root.root.u.def.value, 0);
 530               if (f == NULL)
 531                 {
 532                   /* FIXME: No way to return error.  */
 533                   abort ();
 534                 }
 535               f->jump = is_plt;
 536             }
 537         }
 538
 539       /* Quick and dirty way of stripping these symbols from the
 540          symtab. */
 541       if (bfd_is_abs_section (h->root.root.u.def.section))
 542         h->root.written = TRUE;
 543     }
 544
 545   return TRUE;
 546 }
 547
 548 /* This is called to set the size of the .linux-dynamic section is.
 549    It is called by the Linux linker emulation before_allocation
 550    routine.  We have finished reading all of the input files, and now
 551    we just scan the hash tables to find out how many additional fixups
 552    are required.  */
 553
 554 bfd_boolean
 555 bfd_i386linux_size_dynamic_sections (output_bfd, info)
 556      bfd *output_bfd;
 557      struct bfd_link_info *info;
 558 {
 559   struct fixup *f;
 560   asection *s;
 561
 562   if (output_bfd->xvec != &MY(vec))
 563     return TRUE;
 564
 565   /* First find the fixups... */
 566   linux_link_hash_traverse (linux_hash_table (info),
 567                             linux_tally_symbols,
 568                             (PTR) info);
 569
 570   /* If there are builtin fixups, leave room for a marker.  This is
 571      used by the dynamic linker so that it knows that all that follow
 572      are builtin fixups instead of regular fixups.  */
 573   for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next)
 574     {
 575       if (f->builtin)
 576         {
 577           ++linux_hash_table (info)->fixup_count;
 578           ++linux_hash_table (info)->local_builtins;
 579           break;
 580         }
 581     }
 582
 583   if (linux_hash_table (info)->dynobj == NULL)
 584     {
 585       if (linux_hash_table (info)->fixup_count > 0)
 586         abort ();
 587       return TRUE;
 588     }
 589
 590   /* Allocate memory for our fixup table.  We will fill it in later.  */
 591   s = bfd_get_section_by_name (linux_hash_table (info)->dynobj,
 592                                ".linux-dynamic");
 593   if (s != NULL)
 594     {
 595       s->size = linux_hash_table (info)->fixup_count + 1;
 596       s->size *= 8;
 597       s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->size);
 598       if (s->contents == NULL)
 599         return FALSE;
 600     }
 601
 602   return TRUE;
 603 }
 604
 605 /* We come here once we are ready to actually write the fixup table to
 606    the output file.  Scan the fixup tables and so forth and generate
 607    the stuff we need.  */
 608
 609 static bfd_boolean
 610 linux_finish_dynamic_link (output_bfd, info)
 611      bfd *output_bfd;
 612      struct bfd_link_info *info;
 613 {
 614   asection *s, *os, *is;
 615   bfd_byte *fixup_table;
 616   struct linux_link_hash_entry *h;
 617   struct fixup *f;
 618   unsigned int new_addr;
 619   int section_offset;
 620   unsigned int fixups_written;
 621
 622   if (linux_hash_table (info)->dynobj == NULL)
 623     return TRUE;
 624
 625   s = bfd_get_section_by_name (linux_hash_table (info)->dynobj,
 626                                ".linux-dynamic");
 627   BFD_ASSERT (s != NULL);
 628   os = s->output_section;
 629   fixups_written = 0;
 630
 631 #ifdef LINUX_LINK_DEBUG
 632   printf ("Fixup table file offset: %x  VMA: %x\n",
 633           os->filepos + s->output_offset,
 634           os->vma + s->output_offset);
 635 #endif
 636
 637   fixup_table = s->contents;
 638   bfd_put_32 (output_bfd,
 639               (bfd_vma) linux_hash_table (info)->fixup_count, fixup_table);
 640   fixup_table += 4;
 641
 642   /* Fill in fixup table.  */
 643   for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next)
 644     {
 645       if (f->builtin)
 646         continue;
 647
 648       if (f->h->root.root.type != bfd_link_hash_defined
 649           && f->h->root.root.type != bfd_link_hash_defweak)
 650         {
 651           (*_bfd_error_handler)
 652             (_("Symbol %s not defined for fixups\n"),
 653              f->h->root.root.root.string);
 654           continue;
 655         }
 656
 657       is = f->h->root.root.u.def.section;
 658       section_offset = is->output_section->vma + is->output_offset;
 659       new_addr = f->h->root.root.u.def.value + section_offset;
 660
 661 #ifdef LINUX_LINK_DEBUG
 662       printf ("Fixup(%d) %s: %x %x\n",f->jump, f->h->root.root.string,
 663               new_addr, f->value);
 664 #endif
 665
 666       if (f->jump)
 667         {
 668           /* Relative address */
 669           new_addr = new_addr - (f->value + 5);
 670           bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table);
 671           fixup_table += 4;
 672           bfd_put_32 (output_bfd, f->value + 1, fixup_table);
 673           fixup_table += 4;
 674         }
 675       else
 676         {
 677           bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table);
 678           fixup_table += 4;
 679           bfd_put_32 (output_bfd, f->value, fixup_table);
 680           fixup_table += 4;
 681         }
 682       ++fixups_written;
 683     }
 684
 685   if (linux_hash_table (info)->local_builtins != 0)
 686     {
 687       /* Special marker so we know to switch to the other type of fixup */
 688       bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table);
 689       fixup_table += 4;
 690       bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table);
 691       fixup_table += 4;
 692       ++fixups_written;
 693       for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next)
 694         {
 695           if (! f->builtin)
 696             continue;
 697
 698           if (f->h->root.root.type != bfd_link_hash_defined
 699               && f->h->root.root.type != bfd_link_hash_defweak)
 700             {
 701               (*_bfd_error_handler)
 702                 (_("Symbol %s not defined for fixups\n"),
 703                  f->h->root.root.root.string);
 704               continue;
 705             }
 706
 707           is = f->h->root.root.u.def.section;
 708           section_offset = is->output_section->vma + is->output_offset;
 709           new_addr = f->h->root.root.u.def.value + section_offset;
 710
 711 #ifdef LINUX_LINK_DEBUG
 712           printf ("Fixup(B) %s: %x %x\n", f->h->root.root.string,
 713                   new_addr, f->value);
 714 #endif
 715
 716           bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table);
 717           fixup_table += 4;
 718           bfd_put_32 (output_bfd, f->value, fixup_table);
 719           fixup_table += 4;
 720           ++fixups_written;
 721         }
 722   }
 723
 724   if (linux_hash_table (info)->fixup_count != fixups_written)
 725     {
 726       (*_bfd_error_handler) (_("Warning: fixup count mismatch\n"));
 727       while (linux_hash_table (info)->fixup_count > fixups_written)
 728         {
 729           bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table);
 730           fixup_table += 4;
 731           bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table);
 732           fixup_table += 4;
 733           ++fixups_written;
 734         }
 735     }
 736
 737   h = linux_link_hash_lookup (linux_hash_table (info),
 738                               "__BUILTIN_FIXUPS__",
 739                               FALSE, FALSE, FALSE);
 740
 741   if (h != NULL
 742       && (h->root.root.type == bfd_link_hash_defined
 743           || h->root.root.type == bfd_link_hash_defweak))
 744     {
 745       is = h->root.root.u.def.section;
 746       section_offset = is->output_section->vma + is->output_offset;
 747       new_addr = h->root.root.u.def.value + section_offset;
 748
 749 #ifdef LINUX_LINK_DEBUG
 750       printf ("Builtin fixup table at %x\n", new_addr);
 751 #endif
 752
 753       bfd_put_32 (output_bfd, (bfd_vma) new_addr, fixup_table);
 754     }
 755   else
 756     bfd_put_32 (output_bfd, (bfd_vma) 0, fixup_table);
 757
 758   if (bfd_seek (output_bfd, (file_ptr) (os->filepos + s->output_offset),
 759                 SEEK_SET) != 0)
 760     return FALSE;
 761
 762   if (bfd_bwrite ((PTR) s->contents, s->size, output_bfd) != s->size)
 763     return FALSE;
 764
 765   return TRUE;
 766 }
 767
 768 #define MY_bfd_link_hash_table_create linux_link_hash_table_create
 769 #define MY_add_one_symbol linux_add_one_symbol
 770 #define MY_finish_dynamic_link linux_finish_dynamic_link
 771
 772 #define MY_zmagic_contiguous 1
 773
 774 #include "aout-target.h"