ld/emultempl/sunos.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 cat >e${EMULATION_NAME}.c <<EOF
   4 /* This file is is generated by a shell script.  DO NOT EDIT! */
   5
   6 /* SunOS emulation code for ${EMULATION_NAME}
   7    Copyright (C) 1991, 93, 94, 95, 96, 97, 98, 1999
   8    Free Software Foundation, Inc.
   9    Written by Steve Chamberlain <sac@cygnus.com>
  10    SunOS shared library support by Ian Lance Taylor <ian@cygnus.com>
  11
  12 This file is part of GLD, the Gnu Linker.
  13
  14 This program is free software; you can redistribute it and/or modify
  15 it under the terms of the GNU General Public License as published by
  16 the Free Software Foundation; either version 2 of the License, or
  17 (at your option) any later version.
  18
  19 This program is distributed in the hope that it will be useful,
  20 but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 GNU General Public License for more details.
  23
  24 You should have received a copy of the GNU General Public License
  25 along with this program; if not, write to the Free Software
  26 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  27
  28 #define TARGET_IS_${EMULATION_NAME}
  29
  30 #include <ctype.h>
  31
  32 #include "bfd.h"
  33 #include "sysdep.h"
  34 #include "bfdlink.h"
  35 #include "libiberty.h"
  36
  37 #include "ld.h"
  38 #include "ldmain.h"
  39 #include "ldemul.h"
  40 #include "ldfile.h"
  41 #include "ldmisc.h"
  42 #include "ldexp.h"
  43 #include "ldlang.h"
  44
  45 #ifdef HAVE_DIRENT_H
  46 # include <dirent.h>
  47 #else
  48 # define dirent direct
  49 # ifdef HAVE_SYS_NDIR_H
  50 #  include <sys/ndir.h>
  51 # endif
  52 # ifdef HAVE_SYS_DIR_H
  53 #  include <sys/dir.h>
  54 # endif
  55 # ifdef HAVE_NDIR_H
  56 #  include <ndir.h>
  57 # endif
  58 #endif
  59
  60 static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
  61 static void gld${EMULATION_NAME}_set_symbols PARAMS ((void));
  62 static void gld${EMULATION_NAME}_create_output_section_statements
  63   PARAMS ((void));
  64 static void gld${EMULATION_NAME}_find_so
  65   PARAMS ((lang_input_statement_type *));
  66 static char *gld${EMULATION_NAME}_search_dir
  67   PARAMS ((const char *, const char *, boolean *));
  68 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
  69 static void gld${EMULATION_NAME}_check_needed
  70   PARAMS ((lang_input_statement_type *));
  71 static boolean gld${EMULATION_NAME}_search_needed
  72   PARAMS ((const char *, const char *));
  73 static boolean gld${EMULATION_NAME}_try_needed
  74   PARAMS ((const char *, const char *));
  75 static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
  76 static void gld${EMULATION_NAME}_find_assignment
  77   PARAMS ((lang_statement_union_type *));
  78 static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
  79 static void gld${EMULATION_NAME}_count_need
  80   PARAMS ((lang_input_statement_type *));
  81 static void gld${EMULATION_NAME}_set_need
  82   PARAMS ((lang_input_statement_type *));
  83 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
  84
  85 static void
  86 gld${EMULATION_NAME}_before_parse()
  87 {
  88   ldfile_output_architecture = bfd_arch_${ARCH};
  89   config.dynamic_link = true;
  90   config.has_shared = true;
  91 }
  92
  93 /* This is called after the command line arguments have been parsed,
  94    but before the linker script has been read.  If this is a native
  95    linker, we add the directories in LD_LIBRARY_PATH to the search
  96    list.  */
  97
  98 static void
  99 gld${EMULATION_NAME}_set_symbols ()
 100 {
 101 EOF
 102 if [ "x${host}" = "x${target}" ] ; then
 103   if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then
 104 cat >>e${EMULATION_NAME}.c <<EOF
 105   const char *env;
 106
 107   env = (const char *) getenv ("LD_LIBRARY_PATH");
 108   if (env != NULL)
 109     {
 110       char *l;
 111
 112       l = xstrdup (env);
 113       while (1)
 114         {
 115           char *c;
 116
 117           c = strchr (l, ':');
 118           if (c != NULL)
 119             *c++ = '\0';
 120           if (*l != '\0')
 121             ldfile_add_library_path (l, false);
 122           if (c == NULL)
 123             break;
 124           l = c;
 125         }
 126     }
 127 EOF
 128   fi
 129 fi
 130 cat >>e${EMULATION_NAME}.c <<EOF
 131 }
 132
 133 /* Despite the name, we use this routine to search for dynamic
 134    libraries.  On SunOS this requires a directory search.  We need to
 135    find the .so file with the highest version number.  The user may
 136    restrict the major version by saying, e.g., -lc.1.  Also, if we
 137    find a .so file, we need to look for a the same file after
 138    replacing .so with .sa; if it exists, it will be an archive which
 139    provide some initializations for data symbols, and we need to
 140    search it after including the .so file.  */
 141
 142 static void
 143 gld${EMULATION_NAME}_create_output_section_statements ()
 144 {
 145   lang_for_each_input_file (gld${EMULATION_NAME}_find_so);
 146 }
 147
 148 /* Search the directory for a .so file for each library search.  */
 149
 150 static void
 151 gld${EMULATION_NAME}_find_so (inp)
 152      lang_input_statement_type *inp;
 153 {
 154   search_dirs_type *search;
 155   char *found = NULL;
 156   char *alc;
 157   struct stat st;
 158
 159   if (! inp->search_dirs_flag
 160       || ! inp->is_archive
 161       || ! inp->dynamic)
 162     return;
 163
 164   ASSERT (strncmp (inp->local_sym_name, "-l", 2) == 0);
 165
 166   for (search = search_head; search != NULL; search = search->next)
 167     {
 168       boolean found_static;
 169
 170       found = gld${EMULATION_NAME}_search_dir (search->name, inp->filename,
 171                                                &found_static);
 172       if (found != NULL || found_static)
 173         break;
 174     }
 175
 176   if (found == NULL)
 177     {
 178       /* We did not find a matching .so file.  This isn't an error,
 179          since there might still be a matching .a file, which will be
 180          found by the usual search.  */
 181       return;
 182     }
 183
 184   /* Replace the filename with the one we have found.  */
 185   alc = (char *) xmalloc (strlen (search->name) + strlen (found) + 2);
 186   sprintf (alc, "%s/%s", search->name, found);
 187   inp->filename = alc;
 188
 189   /* Turn off the search_dirs_flag to prevent ldfile_open_file from
 190      searching for this file again.  */
 191   inp->search_dirs_flag = false;
 192
 193   free (found);
 194
 195   /* Now look for the same file name, but with .sa instead of .so.  If
 196      found, add it to the list of input files.  */
 197   alc = (char *) xmalloc (strlen (inp->filename) + 1);
 198   strcpy (alc, inp->filename);
 199   strstr (alc + strlen (search->name), ".so")[2] = 'a';
 200   if (stat (alc, &st) != 0)
 201     free (alc);
 202   else
 203     {
 204       lang_input_statement_type *sa;
 205
 206       /* Add the .sa file to the statement list just before the .so
 207          file.  This is really a hack.  */
 208       sa = ((lang_input_statement_type *)
 209             xmalloc (sizeof (lang_input_statement_type)));
 210       *sa = *inp;
 211
 212       inp->filename = alc;
 213       inp->local_sym_name = alc;
 214
 215       inp->header.next = (lang_statement_union_type *) sa;
 216       inp->next_real_file = (lang_statement_union_type *) sa;
 217     }
 218 }
 219
 220 /* Search a directory for a .so file.  */
 221
 222 static char *
 223 gld${EMULATION_NAME}_search_dir (dirname, filename, found_static)
 224      const char *dirname;
 225      const char *filename;
 226      boolean *found_static;
 227 {
 228   int force_maj, force_min;
 229   const char *dot;
 230   unsigned int len;
 231   char *alc;
 232   char *found;
 233   int max_maj, max_min;
 234   DIR *dir;
 235   struct dirent *entry;
 236   unsigned int dirnamelen;
 237   char *full_path;
 238   int statval;
 239   struct stat st;
 240
 241   *found_static = false;
 242
 243   force_maj = -1;
 244   force_min = -1;
 245   dot = strchr (filename, '.');
 246   if (dot == NULL)
 247     {
 248       len = strlen (filename);
 249       alc = NULL;
 250     }
 251   else
 252     {
 253       force_maj = atoi (dot + 1);
 254
 255       len = dot - filename;
 256       alc = (char *) xmalloc (len + 1);
 257       strncpy (alc, filename, len);
 258       alc[len] = '\0';
 259       filename = alc;
 260
 261       dot = strchr (dot + 1, '.');
 262       if (dot != NULL)
 263         force_min = atoi (dot + 1);
 264     }
 265
 266   found = NULL;
 267   max_maj = max_min = 0;
 268
 269   dir = opendir (dirname);
 270   if (dir == NULL)
 271     return NULL;
 272   dirnamelen = strlen (dirname);
 273
 274   while ((entry = readdir (dir)) != NULL)
 275     {
 276       const char *s;
 277       int found_maj, found_min;
 278
 279       if (strncmp (entry->d_name, "lib", 3) != 0
 280           || strncmp (entry->d_name + 3, filename, len) != 0)
 281         continue;
 282
 283       if (dot == NULL
 284           && strcmp (entry->d_name + 3 + len, ".a") == 0)
 285         {
 286           *found_static = true;
 287           continue;
 288         }
 289
 290       /* We accept libfoo.so without a version number, even though the
 291          native linker does not.  This is more convenient for packages
 292          which just generate .so files for shared libraries, as on ELF
 293          systems.  */
 294       if (strncmp (entry->d_name + 3 + len, ".so", 3) != 0)
 295         continue;
 296       if (entry->d_name[6 + len] == '\0')
 297         ;
 298       else if (entry->d_name[6 + len] == '.'
 299                && isdigit ((unsigned char) entry->d_name[7 + len]))
 300         ;
 301       else
 302         continue;
 303
 304       for (s = entry->d_name + 6 + len; *s != '\0'; s++)
 305         if (*s != '.' && ! isdigit ((unsigned char) *s))
 306           break;
 307       if (*s != '\0')
 308         continue;
 309
 310       /* We've found a .so file.  Work out the major and minor
 311          version numbers.  */
 312       found_maj = 0;
 313       found_min = 0;
 314       sscanf (entry->d_name + 3 + len, ".so.%d.%d",
 315               &found_maj, &found_min);
 316
 317       if ((force_maj != -1 && force_maj != found_maj)
 318           || (force_min != -1 && force_min != found_min))
 319         continue;
 320
 321       /* Make sure the file really exists (ignore broken symlinks).  */
 322       full_path = xmalloc (dirnamelen + 1 + strlen (entry->d_name) + 1);
 323       sprintf (full_path, "%s/%s", dirname, entry->d_name);
 324       statval = stat (full_path, &st);
 325       free (full_path);
 326       if (statval != 0)
 327         continue;
 328
 329       /* We've found a match for the name we are searching for.  See
 330          if this is the version we should use.  If the major and minor
 331          versions match, we use the last entry in alphabetical order;
 332          I don't know if this is how SunOS distinguishes libc.so.1.8
 333          from libc.so.1.8.1, but it ought to suffice.  */
 334       if (found == NULL
 335           || (found_maj > max_maj)
 336           || (found_maj == max_maj
 337               && (found_min > max_min
 338                   || (found_min == max_min
 339                       && strcmp (entry->d_name, found) > 0))))
 340         {
 341           if (found != NULL)
 342             free (found);
 343           found = (char *) xmalloc (strlen (entry->d_name) + 1);
 344           strcpy (found, entry->d_name);
 345           max_maj = found_maj;
 346           max_min = found_min;
 347         }
 348     }
 349
 350   closedir (dir);
 351
 352   if (alc != NULL)
 353     free (alc);
 354
 355   return found;
 356 }
 357
 358 /* These variables are required to pass information back and forth
 359    between after_open and check_needed.  */
 360
 361 static struct bfd_link_needed_list *global_needed;
 362 static boolean global_found;
 363
 364 /* This is called after all the input files have been opened.  */
 365
 366 static void
 367 gld${EMULATION_NAME}_after_open ()
 368 {
 369   struct bfd_link_needed_list *needed, *l;
 370
 371   /* We only need to worry about this when doing a final link.  */
 372   if (link_info.relocateable || link_info.shared)
 373     return;
 374
 375   /* Get the list of files which appear in ld_need entries in dynamic
 376      objects included in the link.  For each such file, we want to
 377      track down the corresponding library, and include the symbol
 378      table in the link.  This is what the runtime dynamic linker will
 379      do.  Tracking the files down here permits one dynamic object to
 380      include another without requiring special action by the person
 381      doing the link.  Note that the needed list can actually grow
 382      while we are stepping through this loop.  */
 383   needed = bfd_sunos_get_needed_list (output_bfd, &link_info);
 384   for (l = needed; l != NULL; l = l->next)
 385     {
 386       struct bfd_link_needed_list *ll;
 387       const char *lname;
 388       search_dirs_type *search;
 389
 390       lname = l->name;
 391
 392       /* If we've already seen this file, skip it.  */
 393       for (ll = needed; ll != l; ll = ll->next)
 394         if (strcmp (ll->name, lname) == 0)
 395           break;
 396       if (ll != l)
 397         continue;
 398
 399       /* See if this file was included in the link explicitly.  */
 400       global_needed = l;
 401       global_found = false;
 402       lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
 403       if (global_found)
 404         continue;
 405
 406       if (strncmp (lname, "-l", 2) != 0)
 407         {
 408           bfd *abfd;
 409
 410           abfd = bfd_openr (lname, bfd_get_target (output_bfd));
 411           if (abfd != NULL)
 412             {
 413               if (! bfd_check_format (abfd, bfd_object))
 414                 {
 415                   (void) bfd_close (abfd);
 416                   abfd = NULL;
 417                 }
 418             }
 419           if (abfd != NULL)
 420             {
 421               if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
 422                 {
 423                   (void) bfd_close (abfd);
 424                   abfd = NULL;
 425                 }
 426             }
 427           if (abfd != NULL)
 428             {
 429               /* We've found the needed dynamic object.  */
 430               if (! bfd_link_add_symbols (abfd, &link_info))
 431                 einfo ("%F%B: could not read symbols: %E\n", abfd);
 432             }
 433           else
 434             {
 435               einfo ("%P: warning: %s, needed by %B, not found\n",
 436                      lname, l->by);
 437             }
 438
 439           continue;
 440         }
 441
 442       lname += 2;
 443
 444       /* We want to search for the file in the same way that the
 445          dynamic linker will search.  That means that we want to use
 446          rpath_link, rpath or -L, then the environment variable
 447          LD_LIBRARY_PATH (native only), then (if rpath was used) the
 448          linker script LIB_SEARCH_DIRS.  */
 449       if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link,
 450                                               lname))
 451         continue;
 452       if (command_line.rpath != NULL)
 453         {
 454           if (gld${EMULATION_NAME}_search_needed (command_line.rpath, lname))
 455             continue;
 456         }
 457       else
 458         {
 459           for (search = search_head; search != NULL; search = search->next)
 460             if (gld${EMULATION_NAME}_try_needed (search->name, lname))
 461               break;
 462           if (search != NULL)
 463             continue;
 464         }
 465 EOF
 466 if [ "x${host}" = "x${target}" ] ; then
 467   if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then
 468 cat >>e${EMULATION_NAME}.c <<EOF
 469       {
 470         const char *lib_path;
 471
 472         lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
 473         if (gld${EMULATION_NAME}_search_needed (lib_path, lname))
 474           continue;
 475       }
 476 EOF
 477   fi
 478 fi
 479 cat >>e${EMULATION_NAME}.c <<EOF
 480       if (command_line.rpath != NULL)
 481         {
 482           for (search = search_head; search != NULL; search = search->next)
 483             {
 484               if (search->cmdline)
 485                 continue;
 486               if (gld${EMULATION_NAME}_try_needed (search->name, lname))
 487                 break;
 488             }
 489           if (search != NULL)
 490             continue;
 491         }
 492
 493       einfo ("%P: warning: %s, needed by %B, not found\n",
 494              l->name, l->by);
 495     }
 496 }
 497
 498 /* Search for a needed file in a path.  */
 499
 500 static boolean
 501 gld${EMULATION_NAME}_search_needed (path, name)
 502      const char *path;
 503      const char *name;
 504 {
 505   const char *s;
 506
 507   if (path == NULL || *path == '\0')
 508     return false;
 509   while (1)
 510     {
 511       const char *dir;
 512       char *dircopy;
 513
 514       s = strchr (path, ':');
 515       if (s == NULL)
 516         {
 517           dircopy = NULL;
 518           dir = path;
 519         }
 520       else
 521         {
 522           dircopy = (char *) xmalloc (s - path + 1);
 523           memcpy (dircopy, path, s - path);
 524           dircopy[s - path] = '\0';
 525           dir = dircopy;
 526         }
 527
 528       if (gld${EMULATION_NAME}_try_needed (dir, name))
 529         return true;
 530
 531       if (dircopy != NULL)
 532         free (dircopy);
 533
 534       if (s == NULL)
 535         break;
 536       path = s + 1;
 537     }
 538
 539   return false;
 540 }
 541
 542 /* This function is called for each possible directory for a needed
 543    dynamic object.  */
 544
 545 static boolean
 546 gld${EMULATION_NAME}_try_needed (dir, name)
 547      const char *dir;
 548      const char *name;
 549 {
 550   char *file;
 551   char *alc;
 552   boolean ignore;
 553   bfd *abfd;
 554
 555   file = gld${EMULATION_NAME}_search_dir (dir, name, &ignore);
 556   if (file == NULL)
 557     return false;
 558
 559   alc = (char *) xmalloc (strlen (dir) + strlen (file) + 2);
 560   sprintf (alc, "%s/%s", dir, file);
 561   free (file);
 562   abfd = bfd_openr (alc, bfd_get_target (output_bfd));
 563   if (abfd == NULL)
 564     return false;
 565   if (! bfd_check_format (abfd, bfd_object))
 566     {
 567       (void) bfd_close (abfd);
 568       return false;
 569     }
 570   if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
 571     {
 572       (void) bfd_close (abfd);
 573       return false;
 574     }
 575
 576   /* We've found the needed dynamic object.  */
 577
 578   /* Add this file into the symbol table.  */
 579   if (! bfd_link_add_symbols (abfd, &link_info))
 580     einfo ("%F%B: could not read symbols: %E\n", abfd);
 581
 582   return true;
 583 }
 584
 585 /* See if we have already included a needed object in the link.  This
 586    does not have to be precise, as it does no harm to include a
 587    dynamic object more than once.  */
 588
 589 static void
 590 gld${EMULATION_NAME}_check_needed (s)
 591      lang_input_statement_type *s;
 592 {
 593   if (s->filename == NULL)
 594     return;
 595   if (strncmp (global_needed->name, "-l", 2) != 0)
 596     {
 597       if (strcmp (s->filename, global_needed->name) == 0)
 598         global_found = true;
 599     }
 600   else
 601     {
 602       const char *sname, *lname;
 603       const char *sdot, *ldot;
 604       int lmaj, lmin, smaj, smin;
 605
 606       lname = global_needed->name + 2;
 607
 608       sname = strrchr (s->filename, '/');
 609       if (sname == NULL)
 610         sname = s->filename;
 611       else
 612         ++sname;
 613
 614       if (strncmp (sname, "lib", 3) != 0)
 615         return;
 616       sname += 3;
 617
 618       ldot = strchr (lname, '.');
 619       if (ldot == NULL)
 620         ldot = lname + strlen (lname);
 621
 622       sdot = strstr (sname, ".so.");
 623       if (sdot == NULL)
 624         return;
 625
 626       if (sdot - sname != ldot - lname
 627           || strncmp (lname, sname, sdot - sname) != 0)
 628         return;
 629
 630       lmaj = lmin = -1;
 631       sscanf (ldot, ".%d.%d", &lmaj, &lmin);
 632       smaj = smin = -1;
 633       sscanf (sdot, ".so.%d.%d", &smaj, &smin);
 634       if ((smaj != lmaj && smaj != -1 && lmaj != -1)
 635           || (smin != lmin && smin != -1 && lmin != -1))
 636         return;
 637
 638       global_found = true;
 639     }
 640 }
 641
 642 /* We need to use static variables to pass information around the call
 643    to lang_for_each_statement.  Ick.  */
 644
 645 static const char *find_assign;
 646 static boolean found_assign;
 647
 648 /* We need to use static variables to pass information around the call
 649    to lang_for_each_input_file.  Ick.  */
 650
 651 static bfd_size_type need_size;
 652 static bfd_size_type need_entries;
 653 static bfd_byte *need_contents;
 654 static bfd_byte *need_pinfo;
 655 static bfd_byte *need_pnames;
 656
 657 /* The size of one entry in the .need section, not including the file
 658    name.  */
 659
 660 #define NEED_ENTRY_SIZE (16)
 661
 662 /* This is called after the sections have been attached to output
 663    sections, but before any sizes or addresses have been set.  */
 664
 665 static void
 666 gld${EMULATION_NAME}_before_allocation ()
 667 {
 668   struct bfd_link_hash_entry *hdyn = NULL;
 669   asection *sneed;
 670   asection *srules;
 671   asection *sdyn;
 672
 673   /* The SunOS native linker creates a shared library whenever there
 674      are any undefined symbols in a link, unless -e is used.  This is
 675      pretty weird, but we are compatible.  */
 676   if (! link_info.shared && ! link_info.relocateable && ! entry_from_cmdline)
 677     {
 678       struct bfd_link_hash_entry *h;
 679
 680       for (h = link_info.hash->undefs; h != NULL; h = h->next)
 681         {
 682           if (h->type == bfd_link_hash_undefined
 683               && h->u.undef.abfd != NULL
 684               && (h->u.undef.abfd->flags & DYNAMIC) == 0
 685               && strcmp (h->root.string, "__DYNAMIC") != 0
 686               && strcmp (h->root.string, "__GLOBAL_OFFSET_TABLE_") != 0)
 687             {
 688               find_assign = h->root.string;
 689               found_assign = false;
 690               lang_for_each_statement (gld${EMULATION_NAME}_find_assignment);
 691               if (! found_assign)
 692                 {
 693                   link_info.shared = true;
 694                   break;
 695                 }
 696             }
 697         }
 698     }
 699
 700   if (link_info.shared)
 701     {
 702       lang_output_section_statement_type *os;
 703
 704       /* Set the .text section to start at 0x20, not 0x2020.  FIXME:
 705          This is too magical.  */
 706       os = lang_output_section_statement_lookup (".text");
 707       if (os->addr_tree == NULL)
 708         os->addr_tree = exp_intop (0x20);
 709     }
 710
 711   /* We need to create a __DYNAMIC symbol.  We don't do this in the
 712      linker script because we want to set the value to the start of
 713      the dynamic section if there is one, or to zero if there isn't
 714      one.  We need to create the symbol before calling
 715      size_dynamic_sections, although we can't set the value until
 716      afterward.  */
 717   if (! link_info.relocateable)
 718     {
 719       hdyn = bfd_link_hash_lookup (link_info.hash, "__DYNAMIC", true, false,
 720                                    false);
 721       if (hdyn == NULL)
 722         einfo ("%P%F: bfd_link_hash_lookup: %E\n");
 723       if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
 724                                               "__DYNAMIC"))
 725         einfo ("%P%F: failed to record assignment to __DYNAMIC: %E\n");
 726     }
 727
 728   /* If we are going to make any variable assignments, we need to let
 729      the backend linker know about them in case the variables are
 730      referred to by dynamic objects.  */
 731   lang_for_each_statement (gld${EMULATION_NAME}_find_assignment);
 732
 733   /* Let the backend linker work out the sizes of any sections
 734      required by dynamic linking.  */
 735   if (! bfd_sunos_size_dynamic_sections (output_bfd, &link_info, &sdyn,
 736                                          &sneed, &srules))
 737     einfo ("%P%F: failed to set dynamic section sizes: %E\n");
 738
 739   if (sneed != NULL)
 740     {
 741       /* Set up the .need section.  See the description of the ld_need
 742          field in include/aout/sun4.h.  */
 743
 744       need_entries = 0;
 745       need_size = 0;
 746
 747       lang_for_each_input_file (gld${EMULATION_NAME}_count_need);
 748
 749       /* We should only have a .need section if we have at least one
 750          dynamic object.  */
 751       ASSERT (need_entries != 0);
 752
 753       sneed->_raw_size = need_size;
 754       sneed->contents = (bfd_byte *) xmalloc (need_size);
 755
 756       need_contents = sneed->contents;
 757       need_pinfo = sneed->contents;
 758       need_pnames = sneed->contents + need_entries * 16;
 759
 760       lang_for_each_input_file (gld${EMULATION_NAME}_set_need);
 761
 762       ASSERT ((bfd_size_type) (need_pnames - sneed->contents) == need_size);
 763     }
 764
 765   if (srules != NULL)
 766     {
 767       /* Set up the .rules section.  This is just a PATH like string
 768          of the -L arguments given on the command line.  We permit the
 769          user to specify the directories using the -rpath command line
 770          option.  */
 771       if (command_line.rpath)
 772         {
 773           srules->_raw_size = strlen (command_line.rpath);
 774           srules->contents = (bfd_byte *) command_line.rpath;
 775         }
 776       else
 777         {
 778           unsigned int size;
 779           search_dirs_type *search;
 780
 781           size = 0;
 782           for (search = search_head; search != NULL; search = search->next)
 783             if (search->cmdline)
 784               size += strlen (search->name) + 1;
 785           srules->_raw_size = size;
 786           if (size > 0)
 787             {
 788               char *p;
 789
 790               srules->contents = (bfd_byte *) xmalloc (size);
 791               p = (char *) srules->contents;
 792               *p = '\0';
 793               for (search = search_head; search != NULL; search = search->next)
 794                 {
 795                   if (search->cmdline)
 796                     {
 797                       if (p != (char *) srules->contents)
 798                         *p++ = ':';
 799                       strcpy (p, search->name);
 800                       p += strlen (p);
 801                     }
 802                 }
 803             }
 804         }
 805     }
 806
 807   /* We must assign a value to __DYNAMIC.  It should be zero if we are
 808      not doing a dynamic link, or the start of the .dynamic section if
 809      we are doing one.  */
 810   if (! link_info.relocateable)
 811     {
 812       hdyn->type = bfd_link_hash_defined;
 813       hdyn->u.def.value = 0;
 814       if (sdyn != NULL)
 815         hdyn->u.def.section = sdyn;
 816       else
 817         hdyn->u.def.section = bfd_abs_section_ptr;
 818     }
 819 }
 820
 821 /* This is called by the before_allocation routine via
 822    lang_for_each_statement.  It does one of two things: if the
 823    variable find_assign is set, it sets found_assign if it finds an
 824    assignment to that variable; otherwise it tells the backend linker
 825    about all assignment statements, in case they are assignments to
 826    symbols which are referred to by dynamic objects.  */
 827
 828 static void
 829 gld${EMULATION_NAME}_find_assignment (s)
 830      lang_statement_union_type *s;
 831 {
 832   if (s->header.type == lang_assignment_statement_enum
 833       && (find_assign == NULL || ! found_assign))
 834     gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
 835 }
 836
 837 /* Look through an expression for an assignment statement.  */
 838
 839 static void
 840 gld${EMULATION_NAME}_find_exp_assignment (exp)
 841      etree_type *exp;
 842 {
 843   switch (exp->type.node_class)
 844     {
 845     case etree_assign:
 846       if (find_assign != NULL)
 847         {
 848           if (strcmp (find_assign, exp->assign.dst) == 0)
 849             found_assign = true;
 850           return;
 851         }
 852
 853       if (strcmp (exp->assign.dst, ".") != 0)
 854         {
 855           if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
 856                                                   exp->assign.dst))
 857             einfo ("%P%F: failed to record assignment to %s: %E\n",
 858                    exp->assign.dst);
 859         }
 860       gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
 861       break;
 862
 863     case etree_binary:
 864       gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
 865       gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
 866       break;
 867
 868     case etree_trinary:
 869       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond);
 870       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
 871       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
 872       break;
 873
 874     case etree_unary:
 875       gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
 876       break;
 877
 878     default:
 879       break;
 880     }
 881 }
 882
 883 /* Work out the size of the .need section, and the number of entries.
 884    The backend will set the ld_need field of the dynamic linking
 885    information to point to the .need section.  See include/aout/sun4.h
 886    for more information.  */
 887
 888 static void
 889 gld${EMULATION_NAME}_count_need (inp)
 890      lang_input_statement_type *inp;
 891 {
 892   if (inp->the_bfd != NULL
 893       && (inp->the_bfd->flags & DYNAMIC) != 0)
 894     {
 895       ++need_entries;
 896       need_size += NEED_ENTRY_SIZE;
 897       if (! inp->is_archive)
 898         need_size += strlen (inp->filename) + 1;
 899       else
 900         {
 901           ASSERT (inp->local_sym_name[0] == '-'
 902                   && inp->local_sym_name[1] == 'l');
 903           need_size += strlen (inp->local_sym_name + 2) + 1;
 904         }
 905     }
 906 }
 907
 908 /* Fill in the contents of the .need section.  */
 909
 910 static void
 911 gld${EMULATION_NAME}_set_need (inp)
 912      lang_input_statement_type *inp;
 913 {
 914   if (inp->the_bfd != NULL
 915       && (inp->the_bfd->flags & DYNAMIC) != 0)
 916     {
 917       bfd_size_type c;
 918
 919       /* To really fill in the .need section contents, we need to know
 920          the final file position of the section, but we don't.
 921          Instead, we use offsets, and rely on the BFD backend to
 922          finish the section up correctly.  FIXME: Talk about lack of
 923          referential locality.  */
 924       bfd_put_32 (output_bfd, need_pnames - need_contents, need_pinfo);
 925       if (! inp->is_archive)
 926         {
 927           bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 4);
 928           bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 8);
 929           bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 10);
 930           strcpy (need_pnames, inp->filename);
 931         }
 932       else
 933         {
 934           char *verstr;
 935           int maj, min;
 936
 937           bfd_put_32 (output_bfd, (bfd_vma) 0x80000000, need_pinfo + 4);
 938           maj = 0;
 939           min = 0;
 940           verstr = strstr (inp->filename, ".so.");
 941           if (verstr != NULL)
 942             sscanf (verstr, ".so.%d.%d", &maj, &min);
 943           bfd_put_16 (output_bfd, (bfd_vma) maj, need_pinfo + 8);
 944           bfd_put_16 (output_bfd, (bfd_vma) min, need_pinfo + 10);
 945           strcpy (need_pnames, inp->local_sym_name + 2);
 946         }
 947
 948       c = (need_pinfo - need_contents) / NEED_ENTRY_SIZE;
 949       if (c + 1 >= need_entries)
 950         bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 12);
 951       else
 952         bfd_put_32 (output_bfd, (bfd_vma) (c + 1) * NEED_ENTRY_SIZE,
 953                     need_pinfo + 12);
 954
 955       need_pinfo += NEED_ENTRY_SIZE;
 956       need_pnames += strlen (need_pnames) + 1;
 957     }
 958 }
 959
 960 static char *
 961 gld${EMULATION_NAME}_get_script(isfile)
 962      int *isfile;
 963 EOF
 964
 965 if test -n "$COMPILE_IN"
 966 then
 967 # Scripts compiled in.
 968
 969 # sed commands to quote an ld script as a C string.
 970 sc='s/["\\]/\\&/g
 971 s/$/\\n\\/
 972 1s/^/"/
 973 $s/$/n"/
 974 '
 975
 976 cat >>e${EMULATION_NAME}.c <<EOF
 977 {
 978   *isfile = 0;
 979
 980   if (link_info.relocateable == true && config.build_constructors == true)
 981     return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`;
 982   else if (link_info.relocateable == true)
 983     return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`;
 984   else if (!config.text_read_only)
 985     return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`;
 986   else if (!config.magic_demand_paged)
 987     return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`;
 988   else
 989     return `sed "$sc" ldscripts/${EMULATION_NAME}.x`;
 990 }
 991 EOF
 992
 993 else
 994 # Scripts read from the filesystem.
 995
 996 cat >>e${EMULATION_NAME}.c <<EOF
 997 {
 998   *isfile = 1;
 999
1000   if (link_info.relocateable == true && config.build_constructors == true)
1001     return "ldscripts/${EMULATION_NAME}.xu";
1002   else if (link_info.relocateable == true)
1003     return "ldscripts/${EMULATION_NAME}.xr";
1004   else if (!config.text_read_only)
1005     return "ldscripts/${EMULATION_NAME}.xbn";
1006   else if (!config.magic_demand_paged)
1007     return "ldscripts/${EMULATION_NAME}.xn";
1008   else
1009     return "ldscripts/${EMULATION_NAME}.x";
1010 }
1011 EOF
1012
1013 fi
1014
1015 cat >>e${EMULATION_NAME}.c <<EOF
1016
1017 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
1018 {
1019   gld${EMULATION_NAME}_before_parse,
1020   syslib_default,
1021   hll_default,
1022   after_parse_default,
1023   gld${EMULATION_NAME}_after_open,
1024   after_allocation_default,
1025   set_output_arch_default,
1026   ldemul_default_target,
1027   gld${EMULATION_NAME}_before_allocation,
1028   gld${EMULATION_NAME}_get_script,
1029   "${EMULATION_NAME}",
1030   "${OUTPUT_FORMAT}",
1031   NULL, /* finish */
1032   gld${EMULATION_NAME}_create_output_section_statements,
1033   NULL, /* open_dynamic_library */
1034   NULL, /* place_orphan */
1035   gld${EMULATION_NAME}_set_symbols
1036 };
1037 EOF