binutils/rescoff.c

   1 /* rescoff.c -- read and write resources in Windows COFF files.
   2    Copyright 1997 Free Software Foundation, Inc.
   3    Written by Ian Lance Taylor, Cygnus Support.
   4
   5    This file is part of GNU Binutils.
   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., 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA.  */
  21
  22 /* This file contains function that read and write Windows resources
  23    in COFF files.  */
  24
  25 #include "bfd.h"
  26 #include "bucomm.h"
  27 #include "libiberty.h"
  28 #include "windres.h"
  29
  30 #include <assert.h>
  31
  32 /* In order to use the address of a resource data entry, we need to
  33    get the image base of the file.  Right now we extract it from
  34    internal BFD information.  FIXME.  */
  35
  36 #include "coff/internal.h"
  37 #include "libcoff.h"
  38
  39 /* Information we extract from the file.  */
  40
  41 struct coff_file_info
  42 {
  43   /* File name.  */
  44   const char *filename;
  45   /* Data read from the file.  */
  46   const bfd_byte *data;
  47   /* End of data read from file.  */
  48   const bfd_byte *data_end;
  49   /* Address of the resource section minus the image base of the file.  */
  50   bfd_vma secaddr;
  51   /* Non-zero if the file is big endian.  */
  52   int big_endian;
  53 };
  54
  55 /* A resource directory table in a COFF file.  */
  56
  57 struct extern_res_directory
  58 {
  59   /* Characteristics.  */
  60   bfd_byte characteristics[4];
  61   /* Time stamp.  */
  62   bfd_byte time[4];
  63   /* Major version number.  */
  64   bfd_byte major[2];
  65   /* Minor version number.  */
  66   bfd_byte minor[2];
  67   /* Number of named directory entries.  */
  68   bfd_byte name_count[2];
  69   /* Number of directory entries with IDs.  */
  70   bfd_byte id_count[2];
  71 };
  72
  73 /* A resource directory entry in a COFF file.  */
  74
  75 struct extern_res_entry
  76 {
  77   /* Name or ID.  */
  78   bfd_byte name[4];
  79   /* Address of resource entry or subdirectory.  */
  80   bfd_byte rva[4];
  81 };
  82
  83 /* A resource data entry in a COFF file.  */
  84
  85 struct extern_res_data
  86 {
  87   /* Address of resource data.  This is apparently a file relative
  88      address, rather than a section offset.  */
  89   bfd_byte rva[4];
  90   /* Size of resource data.  */
  91   bfd_byte size[4];
  92   /* Code page.  */
  93   bfd_byte codepage[4];
  94   /* Reserved.  */
  95   bfd_byte reserved[4];
  96 };
  97
  98 /* Macros to swap in values.  */
  99
 100 #define getfi_16(fi, s) ((fi)->big_endian ? bfd_getb16 (s) : bfd_getl16 (s))
 101 #define getfi_32(fi, s) ((fi)->big_endian ? bfd_getb32 (s) : bfd_getl32 (s))
 102
 103 /* Local functions.  */
 104
 105 static void overrun PARAMS ((const struct coff_file_info *, const char *));
 106 static struct res_directory *read_coff_res_dir
 107   PARAMS ((const bfd_byte *, const struct coff_file_info *,
 108            const struct res_id *, int));
 109 static struct res_resource *read_coff_data_entry
 110   PARAMS ((const bfd_byte *, const struct coff_file_info *,
 111            const struct res_id *));
 112 \f
 113 /* Read the resources in a COFF file.  */
 114
 115 struct res_directory *
 116 read_coff_rsrc (filename, target)
 117      const char *filename;
 118      const char *target;
 119 {
 120   bfd *abfd;
 121   char **matching;
 122   asection *sec;
 123   bfd_size_type size;
 124   bfd_byte *data;
 125   struct coff_file_info finfo;
 126
 127   abfd = bfd_openr (filename, target);
 128   if (abfd == NULL)
 129     bfd_fatal (filename);
 130
 131   if (! bfd_check_format_matches (abfd, bfd_object, &matching))
 132     {
 133       bfd_nonfatal (bfd_get_filename (abfd));
 134       if (bfd_get_error () == bfd_error_file_ambiguously_recognized)
 135         list_matching_formats (matching);
 136       xexit (1);
 137     }
 138
 139   sec = bfd_get_section_by_name (abfd, ".rsrc");
 140   if (sec == NULL)
 141     {
 142       fprintf (stderr, "%s: %s: no resource section\n", program_name,
 143                filename);
 144       xexit (1);
 145     }
 146
 147   size = bfd_section_size (abfd, sec);
 148   data = (bfd_byte *) res_alloc (size);
 149
 150   if (! bfd_get_section_contents (abfd, sec, data, 0, size))
 151     bfd_fatal ("can't read resource section");
 152
 153   finfo.filename = filename;
 154   finfo.data = data;
 155   finfo.data_end = data + size;
 156   finfo.secaddr = (bfd_get_section_vma (abfd, sec)
 157                    - pe_data (abfd)->pe_opthdr.ImageBase);
 158   finfo.big_endian = bfd_big_endian (abfd);
 159
 160   bfd_close (abfd);
 161
 162   /* Now just read in the top level resource directory.  Note that we
 163      don't free data, since we create resource entries that point into
 164      it.  If we ever want to free up the resource information we read,
 165      this will have to be cleaned up.  */
 166
 167   return read_coff_res_dir (data, &finfo, (const struct res_id *) NULL, 0);
 168 }
 169
 170 /* Give an error if we are out of bounds.  */
 171
 172 static void
 173 overrun (finfo, msg)
 174      const struct coff_file_info *finfo;
 175      const char *msg;
 176 {
 177   fatal ("%s: %s: address out of bounds", finfo->filename, msg);
 178 }
 179
 180 /* Read a resource directory.  */
 181
 182 static struct res_directory *
 183 read_coff_res_dir (data, finfo, type, level)
 184      const bfd_byte *data;
 185      const struct coff_file_info *finfo;
 186      const struct res_id *type;
 187      int level;
 188 {
 189   const struct extern_res_directory *erd;
 190   struct res_directory *rd;
 191   int name_count, id_count, i;
 192   struct res_entry **pp;
 193   const struct extern_res_entry *ere;
 194
 195   if (finfo->data_end - data < sizeof (struct extern_res_directory))
 196     overrun (finfo, "directory");
 197
 198   erd = (const struct extern_res_directory *) data;
 199
 200   rd = (struct res_directory *) res_alloc (sizeof *rd);
 201   rd->characteristics = getfi_32 (finfo, erd->characteristics);
 202   rd->time = getfi_32 (finfo, erd->time);
 203   rd->major = getfi_16 (finfo, erd->major);
 204   rd->minor = getfi_16 (finfo, erd->minor);
 205   rd->entries = NULL;
 206
 207   name_count = getfi_16 (finfo, erd->name_count);
 208   id_count = getfi_16 (finfo, erd->id_count);
 209
 210   pp = &rd->entries;
 211
 212   /* The resource directory entries immediately follow the directory
 213      table.  */
 214   ere = (const struct extern_res_entry *) (erd + 1);
 215
 216   for (i = 0; i < name_count; i++, ere++)
 217     {
 218       unsigned long name, rva;
 219       struct res_entry *re;
 220       const bfd_byte *ers;
 221       int length, j;
 222
 223       if ((const bfd_byte *) ere >= finfo->data_end)
 224         overrun (finfo, "named directory entry");
 225
 226       name = getfi_32 (finfo, ere->name);
 227       rva = getfi_32 (finfo, ere->rva);
 228
 229       /* For some reason the high bit in NAME is set.  */
 230       name &=~ 0x80000000;
 231
 232       if (name > finfo->data_end - finfo->data)
 233         overrun (finfo, "directory entry name");
 234
 235       ers = finfo->data + name;
 236
 237       re = (struct res_entry *) res_alloc (sizeof *re);
 238       re->next = NULL;
 239       re->id.named = 1;
 240       length = getfi_16 (finfo, ers);
 241       re->id.u.n.length = length;
 242       re->id.u.n.name = (unichar *) res_alloc (length * sizeof (unichar));
 243       for (j = 0; j < length; j++)
 244         re->id.u.n.name[j] = getfi_16 (finfo, ers + j * 2 + 2);
 245
 246       if (level == 0)
 247         type = &re->id;
 248
 249       if ((rva & 0x80000000) != 0)
 250         {
 251           rva &=~ 0x80000000;
 252           if (rva >= finfo->data_end - finfo->data)
 253             overrun (finfo, "named subdirectory");
 254           re->subdir = 1;
 255           re->u.dir = read_coff_res_dir (finfo->data + rva, finfo, type,
 256                                          level + 1);
 257         }
 258       else
 259         {
 260           if (rva >= finfo->data_end - finfo->data)
 261             overrun (finfo, "named resource");
 262           re->subdir = 0;
 263           re->u.res = read_coff_data_entry (finfo->data + rva, finfo, type);
 264         }
 265
 266       *pp = re;
 267       pp = &re->next;
 268     }
 269
 270   for (i = 0; i < id_count; i++, ere++)
 271     {
 272       unsigned long name, rva;
 273       struct res_entry *re;
 274
 275       if ((const bfd_byte *) ere >= finfo->data_end)
 276         overrun (finfo, "ID directory entry");
 277
 278       name = getfi_32 (finfo, ere->name);
 279       rva = getfi_32 (finfo, ere->rva);
 280
 281       re = (struct res_entry *) res_alloc (sizeof *re);
 282       re->next = NULL;
 283       re->id.named = 0;
 284       re->id.u.id = name;
 285
 286       if (level == 0)
 287         type = &re->id;
 288
 289       if ((rva & 0x80000000) != 0)
 290         {
 291           rva &=~ 0x80000000;
 292           if (rva >= finfo->data_end - finfo->data)
 293             overrun (finfo, "ID subdirectory");
 294           re->subdir = 1;
 295           re->u.dir = read_coff_res_dir (finfo->data + rva, finfo, type,
 296                                          level + 1);
 297         }
 298       else
 299         {
 300           if (rva >= finfo->data_end - finfo->data)
 301             overrun (finfo, "ID resource");
 302           re->subdir = 0;
 303           re->u.res = read_coff_data_entry (finfo->data + rva, finfo, type);
 304         }
 305
 306       *pp = re;
 307       pp = &re->next;
 308     }
 309
 310   return rd;
 311 }
 312
 313 /* Read a resource data entry.  */
 314
 315 static struct res_resource *
 316 read_coff_data_entry (data, finfo, type)
 317      const bfd_byte *data;
 318      const struct coff_file_info *finfo;
 319      const struct res_id *type;
 320 {
 321   const struct extern_res_data *erd;
 322   struct res_resource *r;
 323   unsigned long size, rva;
 324   const bfd_byte *resdata;
 325
 326   if (type == NULL)
 327     fatal ("resource type unknown");
 328
 329   if (finfo->data_end - data < sizeof (struct extern_res_data))
 330     overrun (finfo, "data entry");
 331
 332   erd = (const struct extern_res_data *) data;
 333
 334   size = getfi_32 (finfo, erd->size);
 335   rva = getfi_32 (finfo, erd->rva);
 336   if (rva < finfo->secaddr
 337       || rva - finfo->secaddr >= finfo->data_end - finfo->data)
 338     overrun (finfo, "resource data");
 339
 340   resdata = finfo->data + (rva - finfo->secaddr);
 341
 342   if (size > finfo->data_end - resdata)
 343     overrun (finfo, "resource data size");
 344
 345   r = bin_to_res (*type, resdata, size, finfo->big_endian);
 346
 347   memset (&r->res_info, 0, sizeof (struct res_res_info));
 348   r->coff_info.codepage = getfi_32 (finfo, erd->codepage);
 349   r->coff_info.reserved = getfi_32 (finfo, erd->reserved);
 350
 351   return r;
 352 }
 353 \f
 354 /* This structure is used to build a list of bindata structures.  */
 355
 356 struct bindata_build
 357 {
 358   /* The data.  */
 359   struct bindata *d;
 360   /* The last structure we have added to the list.  */
 361   struct bindata *last;
 362   /* The size of the list as a whole.  */
 363   unsigned long length;
 364 };
 365
 366 /* This structure keeps track of information as we build the directory
 367    tree.  */
 368
 369 struct coff_write_info
 370 {
 371   /* These fields are based on the BFD.  */
 372   /* The BFD itself.  */
 373   bfd *abfd;
 374   /* Non-zero if the file is big endian.  */
 375   int big_endian;
 376   /* Pointer to section symbol used to build RVA relocs.  */
 377   asymbol **sympp;
 378
 379   /* These fields are computed initially, and then not changed.  */
 380   /* Length of directory tables and entries.  */
 381   unsigned long dirsize;
 382   /* Length of directory entry strings.  */
 383   unsigned long dirstrsize;
 384   /* Length of resource data entries.  */
 385   unsigned long dataentsize;
 386
 387   /* These fields are updated as we add data.  */
 388   /* Directory tables and entries.  */
 389   struct bindata_build dirs;
 390   /* Directory entry strings.  */
 391   struct bindata_build dirstrs;
 392   /* Resource data entries.  */
 393   struct bindata_build dataents;
 394   /* Actual resource data.  */
 395   struct bindata_build resources;
 396   /* Relocations.  */
 397   arelent **relocs;
 398   /* Number of relocations.  */
 399   unsigned int reloc_count;
 400 };
 401
 402 /* Macros to swap out values.  */
 403
 404 #define putcwi_16(cwi, v, s) \
 405   ((cwi->big_endian) ? bfd_putb16 ((v), (s)) : bfd_putl16 ((v), (s)))
 406 #define putcwi_32(cwi, v, s) \
 407   ((cwi->big_endian) ? bfd_putb32 ((v), (s)) : bfd_putl32 ((v), (s)))
 408
 409 static void coff_bin_sizes
 410   PARAMS ((const struct res_directory *, struct coff_write_info *));
 411 static unsigned char *coff_alloc PARAMS ((struct bindata_build *, size_t));
 412 static void coff_to_bin
 413   PARAMS ((const struct res_directory *, struct coff_write_info *));
 414 static void coff_res_to_bin
 415   PARAMS ((const struct res_resource *, struct coff_write_info *));
 416
 417 /* Write resources to a COFF file.  RESOURCES should already be
 418    sorted.
 419
 420    Right now we always create a new file.  Someday we should also
 421    offer the ability to merge resources into an existing file.  This
 422    would require doing the basic work of objcopy, just modifying or
 423    adding the .rsrc section.  */
 424
 425
 426 void
 427 write_coff_file (filename, target, resources)
 428      const char *filename;
 429      const char *target;
 430      const struct res_directory *resources;
 431 {
 432   bfd *abfd;
 433   asection *sec;
 434   struct coff_write_info cwi;
 435   struct bindata *d;
 436   unsigned long length, offset;
 437
 438   abfd = bfd_openw (filename, target);
 439   if (abfd == NULL)
 440     bfd_fatal (filename);
 441
 442   if (! bfd_set_format (abfd, bfd_object))
 443     bfd_fatal ("bfd_set_format");
 444
 445   /* FIXME: This is obviously i386 specific.  */
 446   if (! bfd_set_arch_mach (abfd, bfd_arch_i386, 0))
 447     bfd_fatal ("bfd_set_arch_mach");
 448
 449   if (! bfd_set_file_flags (abfd, HAS_SYMS | HAS_RELOC))
 450     bfd_fatal ("bfd_set_file_flags");
 451
 452   sec = bfd_make_section (abfd, ".rsrc");
 453   if (sec == NULL)
 454     bfd_fatal ("bfd_make_section");
 455
 456   if (! bfd_set_section_flags (abfd, sec,
 457                                (SEC_HAS_CONTENTS | SEC_ALLOC
 458                                 | SEC_LOAD | SEC_DATA)))
 459     bfd_fatal ("bfd_set_section_flags");
 460
 461   if (! bfd_set_symtab (abfd, sec->symbol_ptr_ptr, 1))
 462     bfd_fatal ("bfd_set_symtab");
 463
 464   /* Requiring this is probably a bug in BFD.  */
 465   sec->output_section = sec;
 466
 467   /* The order of data in the .rsrc section is
 468        resource directory tables and entries
 469        resource directory strings
 470        resource data entries
 471        actual resource data
 472
 473      We build these different types of data in different lists.  */
 474
 475   cwi.abfd = abfd;
 476   cwi.big_endian = bfd_big_endian (abfd);
 477   cwi.sympp = sec->symbol_ptr_ptr;
 478   cwi.dirsize = 0;
 479   cwi.dirstrsize = 0;
 480   cwi.dataentsize = 0;
 481   cwi.dirs.d = NULL;
 482   cwi.dirs.last = NULL;
 483   cwi.dirs.length = 0;
 484   cwi.dirstrs.d = NULL;
 485   cwi.dirstrs.last = NULL;
 486   cwi.dirstrs.length = 0;
 487   cwi.dataents.d = NULL;
 488   cwi.dataents.last = NULL;
 489   cwi.dataents.length = 0;
 490   cwi.resources.d = NULL;
 491   cwi.resources.last = NULL;
 492   cwi.resources.length = 0;
 493   cwi.relocs = NULL;
 494   cwi.reloc_count = 0;
 495
 496   /* Work out the sizes of the resource directory entries, so that we
 497      know the various offsets we will need.  */
 498   coff_bin_sizes (resources, &cwi);
 499
 500   /* Force the directory strings to be 32 bit aligned.  Every other
 501      structure is 32 bit aligned anyhow.  */
 502   cwi.dirstrsize = (cwi.dirstrsize + 3) &~ 3;
 503
 504   /* Actually convert the resources to binary.  */
 505   coff_to_bin (resources, &cwi);
 506
 507   /* Add another 2 bytes to the directory strings if needed for
 508      alignment.  */
 509   if ((cwi.dirstrs.length & 3) != 0)
 510     {
 511       unsigned char *ex;
 512
 513       ex = coff_alloc (&cwi.dirstrs, 2);
 514       ex[0] = 0;
 515       ex[1] = 0;
 516     }
 517
 518   /* Make sure that the data we built came out to the same size as we
 519      calculated initially.  */
 520   assert (cwi.dirs.length == cwi.dirsize);
 521   assert (cwi.dirstrs.length == cwi.dirstrsize);
 522   assert (cwi.dataents.length == cwi.dataentsize);
 523
 524   length = (cwi.dirsize
 525             + cwi.dirstrsize
 526             + cwi.dataentsize
 527             + cwi.resources.length);
 528
 529   if (! bfd_set_section_size (abfd, sec, length))
 530     bfd_fatal ("bfd_set_section_size");
 531
 532   bfd_set_reloc (abfd, sec, cwi.relocs, cwi.reloc_count);
 533
 534   offset = 0;
 535   for (d = cwi.dirs.d; d != NULL; d = d->next)
 536     {
 537       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 538         bfd_fatal ("bfd_set_section_contents");
 539       offset += d->length;
 540     }
 541   for (d = cwi.dirstrs.d; d != NULL; d = d->next)
 542     {
 543       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 544         bfd_fatal ("bfd_set_section_contents");
 545       offset += d->length;
 546     }
 547   for (d = cwi.dataents.d; d != NULL; d = d->next)
 548     {
 549       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 550         bfd_fatal ("bfd_set_section_contents");
 551       offset += d->length;
 552     }
 553   for (d = cwi.resources.d; d != NULL; d = d->next)
 554     {
 555       if (! bfd_set_section_contents (abfd, sec, d->data, offset, d->length))
 556         bfd_fatal ("bfd_set_section_contents");
 557       offset += d->length;
 558     }
 559
 560   assert (offset == length);
 561
 562   if (! bfd_close (abfd))
 563     bfd_fatal ("bfd_close");
 564
 565   /* We allocated the relocs array using malloc.  */
 566   free (cwi.relocs);
 567 }
 568
 569 /* Work out the sizes of the various fixed size resource directory
 570    entries.  This updates fields in CWI.  */
 571
 572 static void
 573 coff_bin_sizes (resdir, cwi)
 574      const struct res_directory *resdir;
 575      struct coff_write_info *cwi;
 576 {
 577   const struct res_entry *re;
 578
 579   cwi->dirsize += sizeof (struct extern_res_directory);
 580
 581   for (re = resdir->entries; re != NULL; re = re->next)
 582     {
 583       cwi->dirsize += sizeof (struct extern_res_entry);
 584
 585       if (re->id.named)
 586         cwi->dirstrsize += re->id.u.n.length * 2 + 2;
 587
 588       if (re->subdir)
 589         coff_bin_sizes (re->u.dir, cwi);
 590       else
 591         cwi->dataentsize += sizeof (struct extern_res_data);
 592     }
 593 }
 594
 595 /* Allocate data for a particular list.  */
 596
 597 static unsigned char *
 598 coff_alloc (bb, size)
 599      struct bindata_build *bb;
 600      size_t size;
 601 {
 602   struct bindata *d;
 603
 604   d = (struct bindata *) reswr_alloc (sizeof *d);
 605
 606   d->next = NULL;
 607   d->data = (unsigned char *) reswr_alloc (size);
 608   d->length = size;
 609
 610   if (bb->d == NULL)
 611     bb->d = d;
 612   else
 613     bb->last->next = d;
 614   bb->last = d;
 615   bb->length += size;
 616
 617   return d->data;
 618 }
 619
 620 /* Convert the resource directory RESDIR to binary.  */
 621
 622 static void
 623 coff_to_bin (resdir, cwi)
 624      const struct res_directory *resdir;
 625      struct coff_write_info *cwi;
 626 {
 627   struct extern_res_directory *erd;
 628   int ci, cn;
 629   const struct res_entry *e;
 630   struct extern_res_entry *ere;
 631
 632   /* Write out the directory table.  */
 633
 634   erd = ((struct extern_res_directory *)
 635          coff_alloc (&cwi->dirs, sizeof (*erd)));
 636
 637   putcwi_32 (cwi, resdir->characteristics, erd->characteristics);
 638   putcwi_32 (cwi, resdir->time, erd->time);
 639   putcwi_16 (cwi, resdir->major, erd->major);
 640   putcwi_16 (cwi, resdir->minor, erd->minor);
 641
 642   ci = 0;
 643   cn = 0;
 644   for (e = resdir->entries; e != NULL; e = e->next)
 645     {
 646       if (e->id.named)
 647         ++cn;
 648       else
 649         ++ci;
 650     }
 651
 652   putcwi_16 (cwi, cn, erd->name_count);
 653   putcwi_16 (cwi, ci, erd->id_count);
 654
 655   /* Write out the data entries.  Note that we allocate space for all
 656      the entries before writing them out.  That permits a recursive
 657      call to work correctly when writing out subdirectories.  */
 658
 659   ere = ((struct extern_res_entry *)
 660          coff_alloc (&cwi->dirs, (ci + cn) * sizeof (*ere)));
 661   for (e = resdir->entries; e != NULL; e = e->next, ere++)
 662     {
 663       if (! e->id.named)
 664         putcwi_32 (cwi, e->id.u.id, ere->name);
 665       else
 666         {
 667           unsigned char *str;
 668           int i;
 669
 670           /* For some reason existing files seem to have the high bit
 671              set on the address of the name, although that is not
 672              documented.  */
 673           putcwi_32 (cwi,
 674                      0x80000000 | (cwi->dirsize + cwi->dirstrs.length),
 675                      ere->name);
 676
 677           str = coff_alloc (&cwi->dirstrs, e->id.u.n.length * 2 + 2);
 678           putcwi_16 (cwi, e->id.u.n.length, str);
 679           for (i = 0; i < e->id.u.n.length; i++)
 680             putcwi_16 (cwi, e->id.u.n.name[i], str + i * 2 + 2);
 681         }
 682
 683       if (e->subdir)
 684         {
 685           putcwi_32 (cwi, 0x80000000 | cwi->dirs.length, ere->rva);
 686           coff_to_bin (e->u.dir, cwi);
 687         }
 688       else
 689         {
 690           putcwi_32 (cwi,
 691                      cwi->dirsize + cwi->dirstrsize + cwi->dataents.length,
 692                      ere->rva);
 693
 694           coff_res_to_bin (e->u.res, cwi);
 695         }
 696     }
 697 }
 698
 699 /* Convert the resource RES to binary.  */
 700
 701 static void
 702 coff_res_to_bin (res, cwi)
 703      const struct res_resource *res;
 704      struct coff_write_info *cwi;
 705 {
 706   arelent *r;
 707   struct extern_res_data *erd;
 708   struct bindata *d;
 709   unsigned long length;
 710
 711   /* For some reason, although every other address is a section
 712      offset, the address of the resource data itself is an RVA.  That
 713      means that we need to generate a relocation for it.  We allocate
 714      the relocs array using malloc so that we can use realloc.  FIXME:
 715      This relocation handling is correct for the i386, but probably
 716      not for any other target.  */
 717
 718   r = (arelent *) reswr_alloc (sizeof (arelent));
 719   r->sym_ptr_ptr = cwi->sympp;
 720   r->address = cwi->dirsize + cwi->dirstrsize + cwi->dataents.length;
 721   r->addend = 0;
 722   r->howto = bfd_reloc_type_lookup (cwi->abfd, BFD_RELOC_RVA);
 723   if (r->howto == NULL)
 724     bfd_fatal ("can't get BFD_RELOC_RVA relocation type");
 725
 726   cwi->relocs = xrealloc (cwi->relocs,
 727                           (cwi->reloc_count + 2) * sizeof (arelent *));
 728   cwi->relocs[cwi->reloc_count] = r;
 729   cwi->relocs[cwi->reloc_count + 1] = NULL;
 730   ++cwi->reloc_count;
 731
 732   erd = (struct extern_res_data *) coff_alloc (&cwi->dataents, sizeof (*erd));
 733
 734   putcwi_32 (cwi,
 735              (cwi->dirsize
 736               + cwi->dirstrsize
 737               + cwi->dataentsize
 738               + cwi->resources.length),
 739              erd->rva);
 740   putcwi_32 (cwi, res->coff_info.codepage, erd->codepage);
 741   putcwi_32 (cwi, res->coff_info.reserved, erd->reserved);
 742
 743   d = res_to_bin (res, cwi->big_endian);
 744
 745   if (cwi->resources.d == NULL)
 746     cwi->resources.d = d;
 747   else
 748     cwi->resources.last->next = d;
 749
 750   length = 0;
 751   for (; d->next != NULL; d = d->next)
 752     length += d->length;
 753   length += d->length;
 754   cwi->resources.last = d;
 755   cwi->resources.length += length;
 756
 757   putcwi_32 (cwi, length, erd->size);
 758
 759   /* Force the next resource to have 32 bit alignment.  */
 760
 761   if ((length & 3) != 0)
 762     {
 763       int add;
 764       unsigned char *ex;
 765
 766       add = 4 - (length & 3);
 767
 768       ex = coff_alloc (&cwi->resources, add);
 769       memset (ex, 0, add);
 770     }
 771 }