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 ${EMULATION_NAME}
   7    Copyright (C) 1991, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
   8    Written by Steve Chamberlain <sac@cygnus.com>
   9    SunOS shared library support by Ian Lance Taylor <ian@cygnus.com>
  10
  11 This file is part of GLD, the Gnu Linker.
  12
  13 This program is free software; you can redistribute it and/or modify
  14 it under the terms of the GNU General Public License as published by
  15 the Free Software Foundation; either version 2 of the License, or
  16 (at your option) any later version.
  17
  18 This program is distributed in the hope that it will be useful,
  19 but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 GNU General Public License for more details.
  22
  23 You should have received a copy of the GNU General Public License
  24 along with this program; if not, write to the Free Software
  25 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  26
  27 #define TARGET_IS_${EMULATION_NAME}
  28
  29 #include <ctype.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32
  33 #include "bfd.h"
  34 #include "sysdep.h"
  35 #include "bfdlink.h"
  36 #include "libiberty.h"
  37
  38 #include "ld.h"
  39 #include "ldmain.h"
  40 #include "ldemul.h"
  41 #include "ldfile.h"
  42 #include "ldmisc.h"
  43 #include "ldexp.h"
  44 #include "ldlang.h"
  45
  46 #ifdef HAVE_DIRENT_H
  47 # include <dirent.h>
  48 #else
  49 # define dirent direct
  50 # ifdef HAVE_SYS_NDIR_H
  51 #  include <sys/ndir.h>
  52 # endif
  53 # ifdef HAVE_SYS_DIR_H
  54 #  include <sys/dir.h>
  55 # endif
  56 # ifdef HAVE_NDIR_H
  57 #  include <ndir.h>
  58 # endif
  59 #endif
  60
  61 static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
  62 static void gld${EMULATION_NAME}_set_symbols PARAMS ((void));
  63 static void gld${EMULATION_NAME}_create_output_section_statements
  64   PARAMS ((void));
  65 static void gld${EMULATION_NAME}_find_so
  66   PARAMS ((lang_input_statement_type *));
  67 static char *gld${EMULATION_NAME}_search_dir
  68   PARAMS ((const char *, const char *, boolean *));
  69 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
  70 static void gld${EMULATION_NAME}_check_needed
  71   PARAMS ((lang_input_statement_type *));
  72 static boolean gld${EMULATION_NAME}_search_needed
  73   PARAMS ((const char *, const char *));
  74 static boolean gld${EMULATION_NAME}_try_needed
  75   PARAMS ((const char *, const char *));
  76 static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
  77 static void gld${EMULATION_NAME}_find_assignment
  78   PARAMS ((lang_statement_union_type *));
  79 static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
  80 static void gld${EMULATION_NAME}_count_need
  81   PARAMS ((lang_input_statement_type *));
  82 static void gld${EMULATION_NAME}_set_need
  83   PARAMS ((lang_input_statement_type *));
  84 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
  85
  86 static void
  87 gld${EMULATION_NAME}_before_parse()
  88 {
  89   ldfile_output_architecture = bfd_arch_${ARCH};
  90   config.dynamic_link = true;
  91 }
  92
  93 /* This is called after the command line arguments have been parsed,
  94    but before the linker script has been read.  If this is a native
  95    linker, we add the directories in LD_LIBRARY_PATH to the search
  96    list.  */
  97
  98 static void
  99 gld${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${EMULATION_NAME}_find_so (inp)
 152      lang_input_statement_type *inp;
 153 {
 154   search_dirs_type *search;
 155   char *found;
 156   char *alc;
 157   struct stat st;
 158
 159   if (! inp->search_dirs_flag
 160       || ! inp->is_archive
 161       || ! inp->dynamic)
 162     return;
 163
 164   ASSERT (strncmp (inp->local_sym_name, "-l", 2) == 0);
 165
 166   for (search = search_head; search != NULL; search = search->next)
 167     {
 168       boolean found_static;
 169
 170       found = gld${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
 237   *found_static = false;
 238
 239   force_maj = -1;
 240   force_min = -1;
 241   dot = strchr (filename, '.');
 242   if (dot == NULL)
 243     {
 244       len = strlen (filename);
 245       alc = NULL;
 246     }
 247   else
 248     {
 249       force_maj = atoi (dot + 1);
 250
 251       len = dot - filename;
 252       alc = (char *) xmalloc (len + 1);
 253       strncpy (alc, filename, len);
 254       alc[len] = '\0';
 255       filename = alc;
 256
 257       dot = strchr (dot + 1, '.');
 258       if (dot != NULL)
 259         force_min = atoi (dot + 1);
 260     }
 261
 262   found = NULL;
 263   max_maj = max_min = 0;
 264
 265   dir = opendir (dirname);
 266   if (dir == NULL)
 267     return NULL;
 268
 269   while ((entry = readdir (dir)) != NULL)
 270     {
 271       const char *s;
 272       int found_maj, found_min;
 273
 274       if (strncmp (entry->d_name, "lib", 3) != 0
 275           || strncmp (entry->d_name + 3, filename, len) != 0)
 276         continue;
 277
 278       if (dot == NULL
 279           && strcmp (entry->d_name + 3 + len, ".a") == 0)
 280         {
 281           *found_static = true;
 282           continue;
 283         }
 284
 285       if (strncmp (entry->d_name + 3 + len, ".so.", 4) != 0
 286           || ! isdigit (entry->d_name[7 + len]))
 287         continue;
 288
 289       for (s = entry->d_name + 7 + len; *s != '\0'; s++)
 290         if (*s != '.' && ! isdigit (*s))
 291           break;
 292       if (*s != '\0')
 293         continue;
 294
 295       /* We've found a .so file.  Work out the major and minor
 296          version numbers.  */
 297       found_maj = 0;
 298       found_min = 0;
 299       sscanf (entry->d_name + 3 + len, ".so.%d.%d",
 300               &found_maj, &found_min);
 301
 302       if ((force_maj != -1 && force_maj != found_maj)
 303           || (force_min != -1 && force_min != found_min))
 304         continue;
 305
 306       /* We've found a match for the name we are searching for.  See
 307          if this is the version we should use.  If the major and minor
 308          versions match, we use the last entry in alphabetical order;
 309          I don't know if this is how SunOS distinguishes libc.so.1.8
 310          from libc.so.1.8.1, but it ought to suffice.  */
 311       if (found == NULL
 312           || (found_maj > max_maj)
 313           || (found_maj == max_maj
 314               && (found_min > max_min
 315                   || (found_min == max_min
 316                       && strcmp (entry->d_name, found) > 0))))
 317         {
 318           if (found != NULL)
 319             free (found);
 320           found = (char *) xmalloc (strlen (entry->d_name) + 1);
 321           strcpy (found, entry->d_name);
 322           max_maj = found_maj;
 323           max_min = found_min;
 324         }
 325     }
 326
 327   closedir (dir);
 328
 329   if (alc != NULL)
 330     free (alc);
 331
 332   return found;
 333 }
 334
 335 /* These variables are required to pass information back and forth
 336    between after_open and check_needed.  */
 337
 338 static struct bfd_link_needed_list *global_needed;
 339 static boolean global_found;
 340
 341 /* This is called after all the input files have been opened.  */
 342
 343 static void
 344 gld${EMULATION_NAME}_after_open ()
 345 {
 346   struct bfd_link_needed_list *needed, *l;
 347
 348   /* We only need to worry about this when doing a final link.  */
 349   if (link_info.relocateable || link_info.shared)
 350     return;
 351
 352   /* Get the list of files which appear in ld_need entries in dynamic
 353      objects included in the link.  For each such file, we want to
 354      track down the corresponding library, and include the symbol
 355      table in the link.  This is what the runtime dynamic linker will
 356      do.  Tracking the files down here permits one dynamic object to
 357      include another without requiring special action by the person
 358      doing the link.  Note that the needed list can actually grow
 359      while we are stepping through this loop.  */
 360   needed = bfd_sunos_get_needed_list (output_bfd, &link_info);
 361   for (l = needed; l != NULL; l = l->next)
 362     {
 363       struct bfd_link_needed_list *ll;
 364       const char *lname;
 365       search_dirs_type *search;
 366
 367       lname = l->name;
 368
 369       /* If we've already seen this file, skip it.  */
 370       for (ll = needed; ll != l; ll = ll->next)
 371         if (strcmp (ll->name, lname) == 0)
 372           break;
 373       if (ll != l)
 374         continue;
 375
 376       /* See if this file was included in the link explicitly.  */
 377       global_needed = l;
 378       global_found = false;
 379       lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
 380       if (global_found)
 381         continue;
 382
 383       if (strncmp (lname, "-l", 2) != 0)
 384         {
 385           bfd *abfd;
 386
 387           abfd = bfd_openr (lname, bfd_get_target (output_bfd));
 388           if (abfd != NULL)
 389             {
 390               if (! bfd_check_format (abfd, bfd_object))
 391                 {
 392                   (void) bfd_close (abfd);
 393                   abfd = NULL;
 394                 }
 395             }
 396           if (abfd != NULL)
 397             {
 398               if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
 399                 {
 400                   (void) bfd_close (abfd);
 401                   abfd = NULL;
 402                 }
 403             }
 404           if (abfd != NULL)
 405             {
 406               /* We've found the needed dynamic object.  */
 407               if (! bfd_link_add_symbols (abfd, &link_info))
 408                 einfo ("%F%B: could not read symbols: %E\n", abfd);
 409             }
 410           else
 411             {
 412               einfo ("%P: warning: %s, needed by %B, not found\n",
 413                      lname, l->by);
 414             }
 415
 416           continue;
 417         }
 418
 419       lname += 2;
 420
 421       /* We want to search for the file in the same way that the
 422          dynamic linker will search.  That means that we want to use
 423          rpath_link, rpath or -L, then the environment variable
 424          LD_LIBRARY_PATH (native only), then (if rpath was used) the
 425          linker script LIB_SEARCH_DIRS.  */
 426       if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link,
 427                                               lname))
 428         continue;
 429       if (command_line.rpath != NULL)
 430         {
 431           if (gld${EMULATION_NAME}_search_needed (command_line.rpath, lname))
 432             continue;
 433         }
 434       else
 435         {
 436           for (search = search_head; search != NULL; search = search->next)
 437             if (gld${EMULATION_NAME}_try_needed (search->name, lname))
 438               break;
 439           if (search != NULL)
 440             continue;
 441         }
 442 EOF
 443 if [ "x${host}" = "x${target}" ] ; then
 444   if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then
 445 cat >>e${EMULATION_NAME}.c <<EOF
 446       {
 447         const char *lib_path;
 448
 449         lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
 450         if (gld${EMULATION_NAME}_search_needed (lib_path, lname))
 451           continue;
 452       }
 453 EOF
 454   fi
 455 fi
 456 cat >>e${EMULATION_NAME}.c <<EOF
 457       if (command_line.rpath != NULL)
 458         {
 459           for (search = search_head; search != NULL; search = search->next)
 460             {
 461               if (search->cmdline)
 462                 continue;
 463               if (gld${EMULATION_NAME}_try_needed (search->name, lname))
 464                 break;
 465             }
 466           if (search != NULL)
 467             continue;
 468         }
 469
 470       einfo ("%P: warning: %s, needed by %B, not found\n",
 471              l->name, l->by);
 472     }
 473 }
 474
 475 /* Search for a needed file in a path.  */
 476
 477 static boolean
 478 gld${EMULATION_NAME}_search_needed (path, name)
 479      const char *path;
 480      const char *name;
 481 {
 482   const char *s;
 483
 484   if (path == NULL || *path == '\0')
 485     return false;
 486   while (1)
 487     {
 488       const char *dir;
 489       char *dircopy;
 490
 491       s = strchr (path, ':');
 492       if (s == NULL)
 493         {
 494           dircopy = NULL;
 495           dir = path;
 496         }
 497       else
 498         {
 499           dircopy = (char *) xmalloc (s - path + 1);
 500           memcpy (dircopy, path, s - path);
 501           dircopy[s - path] = '\0';
 502           dir = dircopy;
 503         }
 504
 505       if (gld${EMULATION_NAME}_try_needed (dir, name))
 506         return true;
 507
 508       if (dircopy != NULL)
 509         free (dircopy);
 510
 511       if (s == NULL)
 512         break;
 513       path = s + 1;
 514     }
 515
 516   return false;
 517 }
 518
 519 /* This function is called for each possible directory for a needed
 520    dynamic object.  */
 521
 522 static boolean
 523 gld${EMULATION_NAME}_try_needed (dir, name)
 524      const char *dir;
 525      const char *name;
 526 {
 527   char *file;
 528   char *alc;
 529   boolean ignore;
 530   bfd *abfd;
 531
 532   file = gld${EMULATION_NAME}_search_dir (dir, name, &ignore);
 533   if (file == NULL)
 534     return false;
 535
 536   alc = (char *) xmalloc (strlen (dir) + strlen (file) + 2);
 537   sprintf (alc, "%s/%s", dir, file);
 538   free (file);
 539   abfd = bfd_openr (alc, bfd_get_target (output_bfd));
 540   if (abfd == NULL)
 541     return false;
 542   if (! bfd_check_format (abfd, bfd_object))
 543     {
 544       (void) bfd_close (abfd);
 545       return false;
 546     }
 547   if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
 548     {
 549       (void) bfd_close (abfd);
 550       return false;
 551     }
 552
 553   /* We've found the needed dynamic object.  */
 554
 555   /* Add this file into the symbol table.  */
 556   if (! bfd_link_add_symbols (abfd, &link_info))
 557     einfo ("%F%B: could not read symbols: %E\n", abfd);
 558
 559   return true;
 560 }
 561
 562 /* See if we have already included a needed object in the link.  This
 563    does not have to be precise, as it does no harm to include a
 564    dynamic object more than once.  */
 565
 566 static void
 567 gld${EMULATION_NAME}_check_needed (s)
 568      lang_input_statement_type *s;
 569 {
 570   if (s->filename == NULL)
 571     return;
 572   if (strncmp (global_needed->name, "-l", 2) != 0)
 573     {
 574       if (strcmp (s->filename, global_needed->name) == 0)
 575         global_found = true;
 576     }
 577   else
 578     {
 579       const char *sname, *lname;
 580       const char *sdot, *ldot;
 581       int lmaj, lmin, smaj, smin;
 582
 583       lname = global_needed->name + 2;
 584
 585       sname = strrchr (s->filename, '/');
 586       if (sname == NULL)
 587         sname = s->filename;
 588       else
 589         ++sname;
 590
 591       if (strncmp (sname, "lib", 3) != 0)
 592         return;
 593       sname += 3;
 594
 595       ldot = strchr (lname, '.');
 596       if (ldot == NULL)
 597         ldot = lname + strlen (lname);
 598
 599       sdot = strstr (sname, ".so.");
 600       if (sdot == NULL)
 601         return;
 602
 603       if (sdot - sname != ldot - lname
 604           || strncmp (lname, sname, sdot - sname) != 0)
 605         return;
 606
 607       lmaj = lmin = -1;
 608       sscanf (ldot, ".%d.%d", &lmaj, &lmin);
 609       smaj = smin = -1;
 610       sscanf (sdot, ".so.%d.%d", &smaj, &smin);
 611       if ((smaj != lmaj && smaj != -1 && lmaj != -1)
 612           || (smin != lmin && smin != -1 && lmin != -1))
 613         return;
 614
 615       global_found = true;
 616     }
 617 }
 618
 619 /* We need to use static variables to pass information around the call
 620    to lang_for_each_statement.  Ick.  */
 621
 622 static const char *find_assign;
 623 static boolean found_assign;
 624
 625 /* We need to use static variables to pass information around the call
 626    to lang_for_each_input_file.  Ick.  */
 627
 628 static bfd_size_type need_size;
 629 static bfd_size_type need_entries;
 630 static bfd_byte *need_contents;
 631 static bfd_byte *need_pinfo;
 632 static bfd_byte *need_pnames;
 633
 634 /* The size of one entry in the .need section, not including the file
 635    name.  */
 636
 637 #define NEED_ENTRY_SIZE (16)
 638
 639 /* This is called after the sections have been attached to output
 640    sections, but before any sizes or addresses have been set.  */
 641
 642 static void
 643 gld${EMULATION_NAME}_before_allocation ()
 644 {
 645   struct bfd_link_hash_entry *hdyn = NULL;
 646   asection *sneed;
 647   asection *srules;
 648   asection *sdyn;
 649
 650   /* The SunOS native linker creates a shared library whenever there
 651      are any undefined symbols in a link, unless -e is used.  This is
 652      pretty weird, but we are compatible.  */
 653   if (! link_info.shared && ! link_info.relocateable && ! entry_from_cmdline)
 654     {
 655       struct bfd_link_hash_entry *h;
 656
 657       for (h = link_info.hash->undefs; h != NULL; h = h->next)
 658         {
 659           if (h->type == bfd_link_hash_undefined
 660               && h->u.undef.abfd != NULL
 661               && (h->u.undef.abfd->flags & DYNAMIC) == 0
 662               && strcmp (h->root.string, "__DYNAMIC") != 0
 663               && strcmp (h->root.string, "__GLOBAL_OFFSET_TABLE_") != 0)
 664             {
 665               find_assign = h->root.string;
 666               found_assign = false;
 667               lang_for_each_statement (gld${EMULATION_NAME}_find_assignment);
 668               if (! found_assign)
 669                 {
 670                   link_info.shared = true;
 671                   break;
 672                 }
 673             }
 674         }
 675     }
 676
 677   if (link_info.shared)
 678     {
 679       lang_output_section_statement_type *os;
 680
 681       /* Set the .text section to start at 0x20, not 0x2020.  FIXME:
 682          This is too magical.  */
 683       os = lang_output_section_statement_lookup (".text");
 684       if (os->addr_tree == NULL)
 685         os->addr_tree = exp_intop (0x20);
 686     }
 687
 688   /* We need to create a __DYNAMIC symbol.  We don't do this in the
 689      linker script because we want to set the value to the start of
 690      the dynamic section if there is one, or to zero if there isn't
 691      one.  We need to create the symbol before calling
 692      size_dynamic_sections, although we can't set the value until
 693      afterward.  */
 694   if (! link_info.relocateable)
 695     {
 696       hdyn = bfd_link_hash_lookup (link_info.hash, "__DYNAMIC", true, false,
 697                                    false);
 698       if (hdyn == NULL)
 699         einfo ("%P%F: bfd_link_hash_lookup: %E\n");
 700       if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
 701                                               "__DYNAMIC"))
 702         einfo ("%P%F: failed to record assignment to __DYNAMIC: %E\n");
 703     }
 704
 705   /* If we are going to make any variable assignments, we need to let
 706      the backend linker know about them in case the variables are
 707      referred to by dynamic objects.  */
 708   lang_for_each_statement (gld${EMULATION_NAME}_find_assignment);
 709
 710   /* Let the backend linker work out the sizes of any sections
 711      required by dynamic linking.  */
 712   if (! bfd_sunos_size_dynamic_sections (output_bfd, &link_info, &sdyn,
 713                                          &sneed, &srules))
 714     einfo ("%P%F: failed to set dynamic section sizes: %E\n");
 715
 716   if (sneed != NULL)
 717     {
 718       /* Set up the .need section.  See the description of the ld_need
 719          field in include/aout/sun4.h.  */
 720
 721       need_entries = 0;
 722       need_size = 0;
 723
 724       lang_for_each_input_file (gld${EMULATION_NAME}_count_need);
 725
 726       /* We should only have a .need section if we have at least one
 727          dynamic object.  */
 728       ASSERT (need_entries != 0);
 729
 730       sneed->_raw_size = need_size;
 731       sneed->contents = (bfd_byte *) xmalloc (need_size);
 732
 733       need_contents = sneed->contents;
 734       need_pinfo = sneed->contents;
 735       need_pnames = sneed->contents + need_entries * 16;
 736
 737       lang_for_each_input_file (gld${EMULATION_NAME}_set_need);
 738
 739       ASSERT ((bfd_size_type) (need_pnames - sneed->contents) == need_size);
 740     }
 741
 742   if (srules != NULL)
 743     {
 744       /* Set up the .rules section.  This is just a PATH like string
 745          of the -L arguments given on the command line.  We permit the
 746          user to specify the directories using the -rpath command line
 747          option.  */
 748       if (command_line.rpath)
 749         {
 750           srules->_raw_size = strlen (command_line.rpath);
 751           srules->contents = (bfd_byte *) command_line.rpath;
 752         }
 753       else
 754         {
 755           unsigned int size;
 756           search_dirs_type *search;
 757
 758           size = 0;
 759           for (search = search_head; search != NULL; search = search->next)
 760             if (search->cmdline)
 761               size += strlen (search->name) + 1;
 762           srules->_raw_size = size;
 763           if (size > 0)
 764             {
 765               char *p;
 766
 767               srules->contents = (bfd_byte *) xmalloc (size);
 768               p = (char *) srules->contents;
 769               *p = '\0';
 770               for (search = search_head; search != NULL; search = search->next)
 771                 {
 772                   if (search->cmdline)
 773                     {
 774                       if (p != (char *) srules->contents)
 775                         *p++ = ':';
 776                       strcpy (p, search->name);
 777                       p += strlen (p);
 778                     }
 779                 }
 780             }
 781         }
 782     }
 783
 784   /* We must assign a value to __DYNAMIC.  It should be zero if we are
 785      not doing a dynamic link, or the start of the .dynamic section if
 786      we are doing one.  */
 787   if (! link_info.relocateable)
 788     {
 789       hdyn->type = bfd_link_hash_defined;
 790       hdyn->u.def.value = 0;
 791       if (sdyn != NULL)
 792         hdyn->u.def.section = sdyn;
 793       else
 794         hdyn->u.def.section = bfd_abs_section_ptr;
 795     }
 796 }
 797
 798 /* This is called by the before_allocation routine via
 799    lang_for_each_statement.  It does one of two things: if the
 800    variable find_assign is set, it sets found_assign if it finds an
 801    assignment to that variable; otherwise it tells the backend linker
 802    about all assignment statements, in case they are assignments to
 803    symbols which are referred to by dynamic objects.  */
 804
 805 static void
 806 gld${EMULATION_NAME}_find_assignment (s)
 807      lang_statement_union_type *s;
 808 {
 809   if (s->header.type == lang_assignment_statement_enum
 810       && (find_assign == NULL || ! found_assign))
 811     gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
 812 }
 813
 814 /* Look through an expression for an assignment statement.  */
 815
 816 static void
 817 gld${EMULATION_NAME}_find_exp_assignment (exp)
 818      etree_type *exp;
 819 {
 820   switch (exp->type.node_class)
 821     {
 822     case etree_assign:
 823       if (find_assign != NULL)
 824         {
 825           if (strcmp (find_assign, exp->assign.dst) == 0)
 826             found_assign = true;
 827           return;
 828         }
 829
 830       if (strcmp (exp->assign.dst, ".") != 0)
 831         {
 832           if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
 833                                                   exp->assign.dst))
 834             einfo ("%P%F: failed to record assignment to %s: %E\n",
 835                    exp->assign.dst);
 836         }
 837       gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
 838       break;
 839
 840     case etree_binary:
 841       gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
 842       gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
 843       break;
 844
 845     case etree_trinary:
 846       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond);
 847       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
 848       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
 849       break;
 850
 851     case etree_unary:
 852       gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
 853       break;
 854
 855     default:
 856       break;
 857     }
 858 }
 859
 860 /* Work out the size of the .need section, and the number of entries.
 861    The backend will set the ld_need field of the dynamic linking
 862    information to point to the .need section.  See include/aout/sun4.h
 863    for more information.  */
 864
 865 static void
 866 gld${EMULATION_NAME}_count_need (inp)
 867      lang_input_statement_type *inp;
 868 {
 869   if (inp->the_bfd != NULL
 870       && (inp->the_bfd->flags & DYNAMIC) != 0)
 871     {
 872       ++need_entries;
 873       need_size += NEED_ENTRY_SIZE;
 874       if (! inp->is_archive)
 875         need_size += strlen (inp->filename) + 1;
 876       else
 877         {
 878           ASSERT (inp->local_sym_name[0] == '-'
 879                   && inp->local_sym_name[1] == 'l');
 880           need_size += strlen (inp->local_sym_name + 2) + 1;
 881         }
 882     }
 883 }
 884
 885 /* Fill in the contents of the .need section.  */
 886
 887 static void
 888 gld${EMULATION_NAME}_set_need (inp)
 889      lang_input_statement_type *inp;
 890 {
 891   if (inp->the_bfd != NULL
 892       && (inp->the_bfd->flags & DYNAMIC) != 0)
 893     {
 894       bfd_size_type c;
 895
 896       /* To really fill in the .need section contents, we need to know
 897          the final file position of the section, but we don't.
 898          Instead, we use offsets, and rely on the BFD backend to
 899          finish the section up correctly.  FIXME: Talk about lack of
 900          referential locality.  */
 901       bfd_put_32 (output_bfd, need_pnames - need_contents, need_pinfo);
 902       if (! inp->is_archive)
 903         {
 904           bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 4);
 905           bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 8);
 906           bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 10);
 907           strcpy (need_pnames, inp->filename);
 908         }
 909       else
 910         {
 911           char *verstr;
 912           int maj, min;
 913
 914           bfd_put_32 (output_bfd, (bfd_vma) 0x80000000, need_pinfo + 4);
 915           maj = 0;
 916           min = 0;
 917           verstr = strstr (inp->filename, ".so.");
 918           if (verstr != NULL)
 919             sscanf (verstr, ".so.%d.%d", &maj, &min);
 920           bfd_put_16 (output_bfd, (bfd_vma) maj, need_pinfo + 8);
 921           bfd_put_16 (output_bfd, (bfd_vma) min, need_pinfo + 10);
 922           strcpy (need_pnames, inp->local_sym_name + 2);
 923         }
 924
 925       c = (need_pinfo - need_contents) / NEED_ENTRY_SIZE;
 926       if (c + 1 >= need_entries)
 927         bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 12);
 928       else
 929         bfd_put_32 (output_bfd, (bfd_vma) (c + 1) * NEED_ENTRY_SIZE,
 930                     need_pinfo + 12);
 931
 932       need_pinfo += NEED_ENTRY_SIZE;
 933       need_pnames += strlen (need_pnames) + 1;
 934     }
 935 }
 936
 937 static char *
 938 gld${EMULATION_NAME}_get_script(isfile)
 939      int *isfile;
 940 EOF
 941
 942 if test -n "$COMPILE_IN"
 943 then
 944 # Scripts compiled in.
 945
 946 # sed commands to quote an ld script as a C string.
 947 sc='s/["\\]/\\&/g
 948 s/$/\\n\\/
 949 1s/^/"/
 950 $s/$/n"/
 951 '
 952
 953 cat >>e${EMULATION_NAME}.c <<EOF
 954 {
 955   *isfile = 0;
 956
 957   if (link_info.relocateable == true && config.build_constructors == true)
 958     return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`;
 959   else if (link_info.relocateable == true)
 960     return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`;
 961   else if (!config.text_read_only)
 962     return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`;
 963   else if (!config.magic_demand_paged)
 964     return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`;
 965   else
 966     return `sed "$sc" ldscripts/${EMULATION_NAME}.x`;
 967 }
 968 EOF
 969
 970 else
 971 # Scripts read from the filesystem.
 972
 973 cat >>e${EMULATION_NAME}.c <<EOF
 974 {
 975   *isfile = 1;
 976
 977   if (link_info.relocateable == true && config.build_constructors == true)
 978     return "ldscripts/${EMULATION_NAME}.xu";
 979   else if (link_info.relocateable == true)
 980     return "ldscripts/${EMULATION_NAME}.xr";
 981   else if (!config.text_read_only)
 982     return "ldscripts/${EMULATION_NAME}.xbn";
 983   else if (!config.magic_demand_paged)
 984     return "ldscripts/${EMULATION_NAME}.xn";
 985   else
 986     return "ldscripts/${EMULATION_NAME}.x";
 987 }
 988 EOF
 989
 990 fi
 991
 992 cat >>e${EMULATION_NAME}.c <<EOF
 993
 994 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 995 {
 996   gld${EMULATION_NAME}_before_parse,
 997   syslib_default,
 998   hll_default,
 999   after_parse_default,
1000   gld${EMULATION_NAME}_after_open,
1001   after_allocation_default,
1002   set_output_arch_default,
1003   ldemul_default_target,
1004   gld${EMULATION_NAME}_before_allocation,
1005   gld${EMULATION_NAME}_get_script,
1006   "${EMULATION_NAME}",
1007   "${OUTPUT_FORMAT}",
1008   NULL, /* finish */
1009   gld${EMULATION_NAME}_create_output_section_statements,
1010   NULL, /* open_dynamic_library */
1011   NULL, /* place_orphan */
1012   gld${EMULATION_NAME}_set_symbols
1013 };
1014 EOF