ld/emultempl/sunos.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 if [ -z "$MACHINE" ]; then
   4   OUTPUT_ARCH=${ARCH}
   5 else
   6   OUTPUT_ARCH=${ARCH}:${MACHINE}
   7 fi
   8 cat >e${EMULATION_NAME}.c <<EOF
   9 /* This file is is generated by a shell script.  DO NOT EDIT! */
  10
  11 /* SunOS emulation code for ${EMULATION_NAME}
  12    Copyright 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003
  13    Free Software Foundation, Inc.
  14    Written by Steve Chamberlain <sac@cygnus.com>
  15    SunOS shared library support by Ian Lance Taylor <ian@cygnus.com>
  16
  17 This file is part of GLD, the Gnu Linker.
  18
  19 This program is free software; you can redistribute it and/or modify
  20 it under the terms of the GNU General Public License as published by
  21 the Free Software Foundation; either version 2 of the License, or
  22 (at your option) any later version.
  23
  24 This program is distributed in the hope that it will be useful,
  25 but WITHOUT ANY WARRANTY; without even the implied warranty of
  26 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27 GNU General Public License for more details.
  28
  29 You should have received a copy of the GNU General Public License
  30 along with this program; if not, write to the Free Software
  31 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  32
  33 #define TARGET_IS_${EMULATION_NAME}
  34
  35 #include "bfd.h"
  36 #include "sysdep.h"
  37 #include "bfdlink.h"
  38 #include "libiberty.h"
  39 #include "safe-ctype.h"
  40
  41 #include "ld.h"
  42 #include "ldmain.h"
  43 #include "ldmisc.h"
  44 #include "ldexp.h"
  45 #include "ldlang.h"
  46 #include "ldfile.h"
  47 #include "ldemul.h"
  48
  49 #ifdef HAVE_DIRENT_H
  50 # include <dirent.h>
  51 #else
  52 # define dirent direct
  53 # ifdef HAVE_SYS_NDIR_H
  54 #  include <sys/ndir.h>
  55 # endif
  56 # ifdef HAVE_SYS_DIR_H
  57 #  include <sys/dir.h>
  58 # endif
  59 # ifdef HAVE_NDIR_H
  60 #  include <ndir.h>
  61 # endif
  62 #endif
  63
  64 static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
  65 static void gld${EMULATION_NAME}_set_symbols PARAMS ((void));
  66 static void gld${EMULATION_NAME}_create_output_section_statements
  67   PARAMS ((void));
  68 static void gld${EMULATION_NAME}_find_so
  69   PARAMS ((lang_input_statement_type *));
  70 static char *gld${EMULATION_NAME}_search_dir
  71   PARAMS ((const char *, const char *, bfd_boolean *));
  72 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
  73 static void gld${EMULATION_NAME}_check_needed
  74   PARAMS ((lang_input_statement_type *));
  75 static bfd_boolean gld${EMULATION_NAME}_search_needed
  76   PARAMS ((const char *, const char *));
  77 static bfd_boolean gld${EMULATION_NAME}_try_needed
  78   PARAMS ((const char *, const char *));
  79 static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
  80 static void gld${EMULATION_NAME}_find_assignment
  81   PARAMS ((lang_statement_union_type *));
  82 static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
  83 static void gld${EMULATION_NAME}_count_need
  84   PARAMS ((lang_input_statement_type *));
  85 static void gld${EMULATION_NAME}_set_need
  86   PARAMS ((lang_input_statement_type *));
  87 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
  88
  89 static void
  90 gld${EMULATION_NAME}_before_parse()
  91 {
  92   const bfd_arch_info_type *arch = bfd_scan_arch ("${OUTPUT_ARCH}");
  93   if (arch)
  94     {
  95       ldfile_output_architecture = arch->arch;
  96       ldfile_output_machine = arch->mach;
  97       ldfile_output_machine_name = arch->printable_name;
  98     }
  99   else
 100     ldfile_output_architecture = bfd_arch_${ARCH};
 101   config.dynamic_link = TRUE;
 102   config.has_shared = TRUE;
 103 }
 104
 105 /* This is called after the command line arguments have been parsed,
 106    but before the linker script has been read.  If this is a native
 107    linker, we add the directories in LD_LIBRARY_PATH to the search
 108    list.  */
 109
 110 static void
 111 gld${EMULATION_NAME}_set_symbols ()
 112 {
 113 EOF
 114 if [ "x${host}" = "x${target}" ] ; then
 115   case " ${EMULATION_LIBPATH} " in
 116   *" ${EMULATION_NAME} "*)
 117 cat >>e${EMULATION_NAME}.c <<EOF
 118   const char *env;
 119
 120   env = (const char *) getenv ("LD_LIBRARY_PATH");
 121   if (env != NULL)
 122     {
 123       char *l;
 124
 125       l = xstrdup (env);
 126       while (1)
 127         {
 128           char *c;
 129
 130           c = strchr (l, ':');
 131           if (c != NULL)
 132             *c++ = '\0';
 133           if (*l != '\0')
 134             ldfile_add_library_path (l, FALSE);
 135           if (c == NULL)
 136             break;
 137           l = c;
 138         }
 139     }
 140 EOF
 141   ;;
 142   esac
 143 fi
 144 cat >>e${EMULATION_NAME}.c <<EOF
 145 }
 146
 147 /* Despite the name, we use this routine to search for dynamic
 148    libraries.  On SunOS this requires a directory search.  We need to
 149    find the .so file with the highest version number.  The user may
 150    restrict the major version by saying, e.g., -lc.1.  Also, if we
 151    find a .so file, we need to look for a the same file after
 152    replacing .so with .sa; if it exists, it will be an archive which
 153    provide some initializations for data symbols, and we need to
 154    search it after including the .so file.  */
 155
 156 static void
 157 gld${EMULATION_NAME}_create_output_section_statements ()
 158 {
 159   lang_for_each_input_file (gld${EMULATION_NAME}_find_so);
 160 }
 161
 162 /* Search the directory for a .so file for each library search.  */
 163
 164 static void
 165 gld${EMULATION_NAME}_find_so (inp)
 166      lang_input_statement_type *inp;
 167 {
 168   search_dirs_type *search;
 169   char *found = NULL;
 170   char *alc;
 171   struct stat st;
 172
 173   if (! inp->search_dirs_flag
 174       || ! inp->is_archive
 175       || ! inp->dynamic)
 176     return;
 177
 178   ASSERT (strncmp (inp->local_sym_name, "-l", 2) == 0);
 179
 180   for (search = search_head; search != NULL; search = search->next)
 181     {
 182       bfd_boolean found_static;
 183
 184       found = gld${EMULATION_NAME}_search_dir (search->name, inp->filename,
 185                                                &found_static);
 186       if (found != NULL || found_static)
 187         break;
 188     }
 189
 190   if (found == NULL)
 191     {
 192       /* We did not find a matching .so file.  This isn't an error,
 193          since there might still be a matching .a file, which will be
 194          found by the usual search.  */
 195       return;
 196     }
 197
 198   /* Replace the filename with the one we have found.  */
 199   alc = (char *) xmalloc (strlen (search->name) + strlen (found) + 2);
 200   sprintf (alc, "%s/%s", search->name, found);
 201   inp->filename = alc;
 202
 203   /* Turn off the search_dirs_flag to prevent ldfile_open_file from
 204      searching for this file again.  */
 205   inp->search_dirs_flag = FALSE;
 206
 207   free (found);
 208
 209   /* Now look for the same file name, but with .sa instead of .so.  If
 210      found, add it to the list of input files.  */
 211   alc = (char *) xmalloc (strlen (inp->filename) + 1);
 212   strcpy (alc, inp->filename);
 213   strstr (alc + strlen (search->name), ".so")[2] = 'a';
 214   if (stat (alc, &st) != 0)
 215     free (alc);
 216   else
 217     {
 218       lang_input_statement_type *sa;
 219
 220       /* Add the .sa file to the statement list just before the .so
 221          file.  This is really a hack.  */
 222       sa = ((lang_input_statement_type *)
 223             xmalloc (sizeof (lang_input_statement_type)));
 224       *sa = *inp;
 225
 226       inp->filename = alc;
 227       inp->local_sym_name = alc;
 228
 229       inp->header.next = (lang_statement_union_type *) sa;
 230       inp->next_real_file = (lang_statement_union_type *) sa;
 231     }
 232 }
 233
 234 /* Search a directory for a .so file.  */
 235
 236 static char *
 237 gld${EMULATION_NAME}_search_dir (dirname, filename, found_static)
 238      const char *dirname;
 239      const char *filename;
 240      bfd_boolean *found_static;
 241 {
 242   int force_maj, force_min;
 243   const char *dot;
 244   unsigned int len;
 245   char *alc;
 246   char *found;
 247   int max_maj, max_min;
 248   DIR *dir;
 249   struct dirent *entry;
 250   unsigned int dirnamelen;
 251   char *full_path;
 252   int statval;
 253   struct stat st;
 254
 255   *found_static = FALSE;
 256
 257   force_maj = -1;
 258   force_min = -1;
 259   dot = strchr (filename, '.');
 260   if (dot == NULL)
 261     {
 262       len = strlen (filename);
 263       alc = NULL;
 264     }
 265   else
 266     {
 267       force_maj = atoi (dot + 1);
 268
 269       len = dot - filename;
 270       alc = (char *) xmalloc (len + 1);
 271       strncpy (alc, filename, len);
 272       alc[len] = '\0';
 273       filename = alc;
 274
 275       dot = strchr (dot + 1, '.');
 276       if (dot != NULL)
 277         force_min = atoi (dot + 1);
 278     }
 279
 280   found = NULL;
 281   max_maj = max_min = 0;
 282
 283   dir = opendir (dirname);
 284   if (dir == NULL)
 285     return NULL;
 286   dirnamelen = strlen (dirname);
 287
 288   while ((entry = readdir (dir)) != NULL)
 289     {
 290       const char *s;
 291       int found_maj, found_min;
 292
 293       if (strncmp (entry->d_name, "lib", 3) != 0
 294           || strncmp (entry->d_name + 3, filename, len) != 0)
 295         continue;
 296
 297       if (dot == NULL
 298           && strcmp (entry->d_name + 3 + len, ".a") == 0)
 299         {
 300           *found_static = TRUE;
 301           continue;
 302         }
 303
 304       /* We accept libfoo.so without a version number, even though the
 305          native linker does not.  This is more convenient for packages
 306          which just generate .so files for shared libraries, as on ELF
 307          systems.  */
 308       if (strncmp (entry->d_name + 3 + len, ".so", 3) != 0)
 309         continue;
 310       if (entry->d_name[6 + len] == '\0')
 311         ;
 312       else if (entry->d_name[6 + len] == '.'
 313                && ISDIGIT (entry->d_name[7 + len]))
 314         ;
 315       else
 316         continue;
 317
 318       for (s = entry->d_name + 6 + len; *s != '\0'; s++)
 319         if (*s != '.' && ! ISDIGIT (*s))
 320           break;
 321       if (*s != '\0')
 322         continue;
 323
 324       /* We've found a .so file.  Work out the major and minor
 325          version numbers.  */
 326       found_maj = 0;
 327       found_min = 0;
 328       sscanf (entry->d_name + 3 + len, ".so.%d.%d",
 329               &found_maj, &found_min);
 330
 331       if ((force_maj != -1 && force_maj != found_maj)
 332           || (force_min != -1 && force_min != found_min))
 333         continue;
 334
 335       /* Make sure the file really exists (ignore broken symlinks).  */
 336       full_path = xmalloc (dirnamelen + 1 + strlen (entry->d_name) + 1);
 337       sprintf (full_path, "%s/%s", dirname, entry->d_name);
 338       statval = stat (full_path, &st);
 339       free (full_path);
 340       if (statval != 0)
 341         continue;
 342
 343       /* We've found a match for the name we are searching for.  See
 344          if this is the version we should use.  If the major and minor
 345          versions match, we use the last entry in alphabetical order;
 346          I don't know if this is how SunOS distinguishes libc.so.1.8
 347          from libc.so.1.8.1, but it ought to suffice.  */
 348       if (found == NULL
 349           || (found_maj > max_maj)
 350           || (found_maj == max_maj
 351               && (found_min > max_min
 352                   || (found_min == max_min
 353                       && strcmp (entry->d_name, found) > 0))))
 354         {
 355           if (found != NULL)
 356             free (found);
 357           found = (char *) xmalloc (strlen (entry->d_name) + 1);
 358           strcpy (found, entry->d_name);
 359           max_maj = found_maj;
 360           max_min = found_min;
 361         }
 362     }
 363
 364   closedir (dir);
 365
 366   if (alc != NULL)
 367     free (alc);
 368
 369   return found;
 370 }
 371
 372 /* These variables are required to pass information back and forth
 373    between after_open and check_needed.  */
 374
 375 static struct bfd_link_needed_list *global_needed;
 376 static bfd_boolean global_found;
 377
 378 /* This is called after all the input files have been opened.  */
 379
 380 static void
 381 gld${EMULATION_NAME}_after_open ()
 382 {
 383   struct bfd_link_needed_list *needed, *l;
 384
 385   /* We only need to worry about this when doing a final link.  */
 386   if (link_info.relocateable || link_info.shared)
 387     return;
 388
 389   /* Get the list of files which appear in ld_need entries in dynamic
 390      objects included in the link.  For each such file, we want to
 391      track down the corresponding library, and include the symbol
 392      table in the link.  This is what the runtime dynamic linker will
 393      do.  Tracking the files down here permits one dynamic object to
 394      include another without requiring special action by the person
 395      doing the link.  Note that the needed list can actually grow
 396      while we are stepping through this loop.  */
 397   needed = bfd_sunos_get_needed_list (output_bfd, &link_info);
 398   for (l = needed; l != NULL; l = l->next)
 399     {
 400       struct bfd_link_needed_list *ll;
 401       const char *lname;
 402       search_dirs_type *search;
 403
 404       lname = l->name;
 405
 406       /* If we've already seen this file, skip it.  */
 407       for (ll = needed; ll != l; ll = ll->next)
 408         if (strcmp (ll->name, lname) == 0)
 409           break;
 410       if (ll != l)
 411         continue;
 412
 413       /* See if this file was included in the link explicitly.  */
 414       global_needed = l;
 415       global_found = FALSE;
 416       lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
 417       if (global_found)
 418         continue;
 419
 420       if (strncmp (lname, "-l", 2) != 0)
 421         {
 422           bfd *abfd;
 423
 424           abfd = bfd_openr (lname, bfd_get_target (output_bfd));
 425           if (abfd != NULL)
 426             {
 427               if (! bfd_check_format (abfd, bfd_object))
 428                 {
 429                   (void) bfd_close (abfd);
 430                   abfd = NULL;
 431                 }
 432             }
 433           if (abfd != NULL)
 434             {
 435               if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
 436                 {
 437                   (void) bfd_close (abfd);
 438                   abfd = NULL;
 439                 }
 440             }
 441           if (abfd != NULL)
 442             {
 443               /* We've found the needed dynamic object.  */
 444               if (! bfd_link_add_symbols (abfd, &link_info))
 445                 einfo ("%F%B: could not read symbols: %E\n", abfd);
 446             }
 447           else
 448             {
 449               einfo ("%P: warning: %s, needed by %B, not found\n",
 450                      lname, l->by);
 451             }
 452
 453           continue;
 454         }
 455
 456       lname += 2;
 457
 458       /* We want to search for the file in the same way that the
 459          dynamic linker will search.  That means that we want to use
 460          rpath_link, rpath or -L, then the environment variable
 461          LD_LIBRARY_PATH (native only), then (if rpath was used) the
 462          linker script LIB_SEARCH_DIRS.  */
 463       if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link,
 464                                               lname))
 465         continue;
 466       if (command_line.rpath != NULL)
 467         {
 468           if (gld${EMULATION_NAME}_search_needed (command_line.rpath, lname))
 469             continue;
 470         }
 471       else
 472         {
 473           for (search = search_head; search != NULL; search = search->next)
 474             if (gld${EMULATION_NAME}_try_needed (search->name, lname))
 475               break;
 476           if (search != NULL)
 477             continue;
 478         }
 479 EOF
 480 if [ "x${host}" = "x${target}" ] ; then
 481   case " ${EMULATION_LIBPATH} " in
 482   *" ${EMULATION_NAME} "*)
 483 cat >>e${EMULATION_NAME}.c <<EOF
 484       {
 485         const char *lib_path;
 486
 487         lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
 488         if (gld${EMULATION_NAME}_search_needed (lib_path, lname))
 489           continue;
 490       }
 491 EOF
 492   ;;
 493   esac
 494 fi
 495 cat >>e${EMULATION_NAME}.c <<EOF
 496       if (command_line.rpath != NULL)
 497         {
 498           for (search = search_head; search != NULL; search = search->next)
 499             {
 500               if (search->cmdline)
 501                 continue;
 502               if (gld${EMULATION_NAME}_try_needed (search->name, lname))
 503                 break;
 504             }
 505           if (search != NULL)
 506             continue;
 507         }
 508
 509       einfo ("%P: warning: %s, needed by %B, not found\n",
 510              l->name, l->by);
 511     }
 512 }
 513
 514 /* Search for a needed file in a path.  */
 515
 516 static bfd_boolean
 517 gld${EMULATION_NAME}_search_needed (path, name)
 518      const char *path;
 519      const char *name;
 520 {
 521   const char *s;
 522
 523   if (path == NULL || *path == '\0')
 524     return FALSE;
 525   while (1)
 526     {
 527       const char *dir;
 528       char *dircopy;
 529
 530       s = strchr (path, ':');
 531       if (s == NULL)
 532         {
 533           dircopy = NULL;
 534           dir = path;
 535         }
 536       else
 537         {
 538           dircopy = (char *) xmalloc (s - path + 1);
 539           memcpy (dircopy, path, s - path);
 540           dircopy[s - path] = '\0';
 541           dir = dircopy;
 542         }
 543
 544       if (gld${EMULATION_NAME}_try_needed (dir, name))
 545         return TRUE;
 546
 547       if (dircopy != NULL)
 548         free (dircopy);
 549
 550       if (s == NULL)
 551         break;
 552       path = s + 1;
 553     }
 554
 555   return FALSE;
 556 }
 557
 558 /* This function is called for each possible directory for a needed
 559    dynamic object.  */
 560
 561 static bfd_boolean
 562 gld${EMULATION_NAME}_try_needed (dir, name)
 563      const char *dir;
 564      const char *name;
 565 {
 566   char *file;
 567   char *alc;
 568   bfd_boolean ignore;
 569   bfd *abfd;
 570
 571   file = gld${EMULATION_NAME}_search_dir (dir, name, &ignore);
 572   if (file == NULL)
 573     return FALSE;
 574
 575   alc = (char *) xmalloc (strlen (dir) + strlen (file) + 2);
 576   sprintf (alc, "%s/%s", dir, file);
 577   free (file);
 578   abfd = bfd_openr (alc, bfd_get_target (output_bfd));
 579   if (abfd == NULL)
 580     return FALSE;
 581   if (! bfd_check_format (abfd, bfd_object))
 582     {
 583       (void) bfd_close (abfd);
 584       return FALSE;
 585     }
 586   if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
 587     {
 588       (void) bfd_close (abfd);
 589       return FALSE;
 590     }
 591
 592   /* We've found the needed dynamic object.  */
 593
 594   /* Add this file into the symbol table.  */
 595   if (! bfd_link_add_symbols (abfd, &link_info))
 596     einfo ("%F%B: could not read symbols: %E\n", abfd);
 597
 598   return TRUE;
 599 }
 600
 601 /* See if we have already included a needed object in the link.  This
 602    does not have to be precise, as it does no harm to include a
 603    dynamic object more than once.  */
 604
 605 static void
 606 gld${EMULATION_NAME}_check_needed (s)
 607      lang_input_statement_type *s;
 608 {
 609   if (s->filename == NULL)
 610     return;
 611   if (strncmp (global_needed->name, "-l", 2) != 0)
 612     {
 613       if (strcmp (s->filename, global_needed->name) == 0)
 614         global_found = TRUE;
 615     }
 616   else
 617     {
 618       const char *sname, *lname;
 619       const char *sdot, *ldot;
 620       int lmaj, lmin, smaj, smin;
 621
 622       lname = global_needed->name + 2;
 623
 624       sname = strrchr (s->filename, '/');
 625       if (sname == NULL)
 626         sname = s->filename;
 627       else
 628         ++sname;
 629
 630       if (strncmp (sname, "lib", 3) != 0)
 631         return;
 632       sname += 3;
 633
 634       ldot = strchr (lname, '.');
 635       if (ldot == NULL)
 636         ldot = lname + strlen (lname);
 637
 638       sdot = strstr (sname, ".so.");
 639       if (sdot == NULL)
 640         return;
 641
 642       if (sdot - sname != ldot - lname
 643           || strncmp (lname, sname, sdot - sname) != 0)
 644         return;
 645
 646       lmaj = lmin = -1;
 647       sscanf (ldot, ".%d.%d", &lmaj, &lmin);
 648       smaj = smin = -1;
 649       sscanf (sdot, ".so.%d.%d", &smaj, &smin);
 650       if ((smaj != lmaj && smaj != -1 && lmaj != -1)
 651           || (smin != lmin && smin != -1 && lmin != -1))
 652         return;
 653
 654       global_found = TRUE;
 655     }
 656 }
 657
 658 /* We need to use static variables to pass information around the call
 659    to lang_for_each_statement.  Ick.  */
 660
 661 static const char *find_assign;
 662 static bfd_boolean found_assign;
 663
 664 /* We need to use static variables to pass information around the call
 665    to lang_for_each_input_file.  Ick.  */
 666
 667 static bfd_size_type need_size;
 668 static bfd_size_type need_entries;
 669 static bfd_byte *need_contents;
 670 static bfd_byte *need_pinfo;
 671 static bfd_byte *need_pnames;
 672
 673 /* The size of one entry in the .need section, not including the file
 674    name.  */
 675
 676 #define NEED_ENTRY_SIZE (16)
 677
 678 /* This is called after the sections have been attached to output
 679    sections, but before any sizes or addresses have been set.  */
 680
 681 static void
 682 gld${EMULATION_NAME}_before_allocation ()
 683 {
 684   struct bfd_link_hash_entry *hdyn = NULL;
 685   asection *sneed;
 686   asection *srules;
 687   asection *sdyn;
 688
 689   /* The SunOS native linker creates a shared library whenever there
 690      are any undefined symbols in a link, unless -e is used.  This is
 691      pretty weird, but we are compatible.  */
 692   if (! link_info.shared && ! link_info.relocateable && ! entry_from_cmdline)
 693     {
 694       struct bfd_link_hash_entry *h;
 695
 696       for (h = link_info.hash->undefs; h != NULL; h = h->next)
 697         {
 698           if (h->type == bfd_link_hash_undefined
 699               && h->u.undef.abfd != NULL
 700               && (h->u.undef.abfd->flags & DYNAMIC) == 0
 701               && strcmp (h->root.string, "__DYNAMIC") != 0
 702               && strcmp (h->root.string, "__GLOBAL_OFFSET_TABLE_") != 0)
 703             {
 704               find_assign = h->root.string;
 705               found_assign = FALSE;
 706               lang_for_each_statement (gld${EMULATION_NAME}_find_assignment);
 707               if (! found_assign)
 708                 {
 709                   link_info.shared = TRUE;
 710                   break;
 711                 }
 712             }
 713         }
 714     }
 715
 716   if (link_info.shared)
 717     {
 718       lang_output_section_statement_type *os;
 719
 720       /* Set the .text section to start at 0x20, not 0x2020.  FIXME:
 721          This is too magical.  */
 722       os = lang_output_section_statement_lookup (".text");
 723       if (os->addr_tree == NULL)
 724         os->addr_tree = exp_intop (0x20);
 725     }
 726
 727   /* We need to create a __DYNAMIC symbol.  We don't do this in the
 728      linker script because we want to set the value to the start of
 729      the dynamic section if there is one, or to zero if there isn't
 730      one.  We need to create the symbol before calling
 731      size_dynamic_sections, although we can't set the value until
 732      afterward.  */
 733   if (! link_info.relocateable)
 734     {
 735       hdyn = bfd_link_hash_lookup (link_info.hash, "__DYNAMIC", TRUE, FALSE,
 736                                    FALSE);
 737       if (hdyn == NULL)
 738         einfo ("%P%F: bfd_link_hash_lookup: %E\n");
 739       if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
 740                                               "__DYNAMIC"))
 741         einfo ("%P%F: failed to record assignment to __DYNAMIC: %E\n");
 742     }
 743
 744   /* If we are going to make any variable assignments, we need to let
 745      the backend linker know about them in case the variables are
 746      referred to by dynamic objects.  */
 747   lang_for_each_statement (gld${EMULATION_NAME}_find_assignment);
 748
 749   /* Let the backend linker work out the sizes of any sections
 750      required by dynamic linking.  */
 751   if (! bfd_sunos_size_dynamic_sections (output_bfd, &link_info, &sdyn,
 752                                          &sneed, &srules))
 753     einfo ("%P%F: failed to set dynamic section sizes: %E\n");
 754
 755   if (sneed != NULL)
 756     {
 757       /* Set up the .need section.  See the description of the ld_need
 758          field in include/aout/sun4.h.  */
 759
 760       need_entries = 0;
 761       need_size = 0;
 762
 763       lang_for_each_input_file (gld${EMULATION_NAME}_count_need);
 764
 765       /* We should only have a .need section if we have at least one
 766          dynamic object.  */
 767       ASSERT (need_entries != 0);
 768
 769       sneed->_raw_size = need_size;
 770       sneed->contents = (bfd_byte *) xmalloc (need_size);
 771
 772       need_contents = sneed->contents;
 773       need_pinfo = sneed->contents;
 774       need_pnames = sneed->contents + need_entries * 16;
 775
 776       lang_for_each_input_file (gld${EMULATION_NAME}_set_need);
 777
 778       ASSERT ((bfd_size_type) (need_pnames - sneed->contents) == need_size);
 779     }
 780
 781   if (srules != NULL)
 782     {
 783       /* Set up the .rules section.  This is just a PATH like string
 784          of the -L arguments given on the command line.  We permit the
 785          user to specify the directories using the -rpath command line
 786          option.  */
 787       if (command_line.rpath)
 788         {
 789           srules->_raw_size = strlen (command_line.rpath);
 790           srules->contents = (bfd_byte *) command_line.rpath;
 791         }
 792       else
 793         {
 794           unsigned int size;
 795           search_dirs_type *search;
 796
 797           size = 0;
 798           for (search = search_head; search != NULL; search = search->next)
 799             if (search->cmdline)
 800               size += strlen (search->name) + 1;
 801           srules->_raw_size = size;
 802           if (size > 0)
 803             {
 804               char *p;
 805
 806               srules->contents = (bfd_byte *) xmalloc (size);
 807               p = (char *) srules->contents;
 808               *p = '\0';
 809               for (search = search_head; search != NULL; search = search->next)
 810                 {
 811                   if (search->cmdline)
 812                     {
 813                       if (p != (char *) srules->contents)
 814                         *p++ = ':';
 815                       strcpy (p, search->name);
 816                       p += strlen (p);
 817                     }
 818                 }
 819             }
 820         }
 821     }
 822
 823   /* We must assign a value to __DYNAMIC.  It should be zero if we are
 824      not doing a dynamic link, or the start of the .dynamic section if
 825      we are doing one.  */
 826   if (! link_info.relocateable)
 827     {
 828       hdyn->type = bfd_link_hash_defined;
 829       hdyn->u.def.value = 0;
 830       if (sdyn != NULL)
 831         hdyn->u.def.section = sdyn;
 832       else
 833         hdyn->u.def.section = bfd_abs_section_ptr;
 834     }
 835 }
 836
 837 /* This is called by the before_allocation routine via
 838    lang_for_each_statement.  It does one of two things: if the
 839    variable find_assign is set, it sets found_assign if it finds an
 840    assignment to that variable; otherwise it tells the backend linker
 841    about all assignment statements, in case they are assignments to
 842    symbols which are referred to by dynamic objects.  */
 843
 844 static void
 845 gld${EMULATION_NAME}_find_assignment (s)
 846      lang_statement_union_type *s;
 847 {
 848   if (s->header.type == lang_assignment_statement_enum
 849       && (find_assign == NULL || ! found_assign))
 850     gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
 851 }
 852
 853 /* Look through an expression for an assignment statement.  */
 854
 855 static void
 856 gld${EMULATION_NAME}_find_exp_assignment (exp)
 857      etree_type *exp;
 858 {
 859   switch (exp->type.node_class)
 860     {
 861     case etree_assign:
 862       if (find_assign != NULL)
 863         {
 864           if (strcmp (find_assign, exp->assign.dst) == 0)
 865             found_assign = TRUE;
 866           return;
 867         }
 868
 869       if (strcmp (exp->assign.dst, ".") != 0)
 870         {
 871           if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
 872                                                   exp->assign.dst))
 873             einfo ("%P%F: failed to record assignment to %s: %E\n",
 874                    exp->assign.dst);
 875         }
 876       gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
 877       break;
 878
 879     case etree_binary:
 880       gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
 881       gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
 882       break;
 883
 884     case etree_trinary:
 885       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond);
 886       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
 887       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
 888       break;
 889
 890     case etree_unary:
 891       gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
 892       break;
 893
 894     default:
 895       break;
 896     }
 897 }
 898
 899 /* Work out the size of the .need section, and the number of entries.
 900    The backend will set the ld_need field of the dynamic linking
 901    information to point to the .need section.  See include/aout/sun4.h
 902    for more information.  */
 903
 904 static void
 905 gld${EMULATION_NAME}_count_need (inp)
 906      lang_input_statement_type *inp;
 907 {
 908   if (inp->the_bfd != NULL
 909       && (inp->the_bfd->flags & DYNAMIC) != 0)
 910     {
 911       ++need_entries;
 912       need_size += NEED_ENTRY_SIZE;
 913       if (! inp->is_archive)
 914         need_size += strlen (inp->filename) + 1;
 915       else
 916         {
 917           ASSERT (inp->local_sym_name[0] == '-'
 918                   && inp->local_sym_name[1] == 'l');
 919           need_size += strlen (inp->local_sym_name + 2) + 1;
 920         }
 921     }
 922 }
 923
 924 /* Fill in the contents of the .need section.  */
 925
 926 static void
 927 gld${EMULATION_NAME}_set_need (inp)
 928      lang_input_statement_type *inp;
 929 {
 930   if (inp->the_bfd != NULL
 931       && (inp->the_bfd->flags & DYNAMIC) != 0)
 932     {
 933       bfd_size_type c;
 934
 935       /* To really fill in the .need section contents, we need to know
 936          the final file position of the section, but we don't.
 937          Instead, we use offsets, and rely on the BFD backend to
 938          finish the section up correctly.  FIXME: Talk about lack of
 939          referential locality.  */
 940       bfd_put_32 (output_bfd, need_pnames - need_contents, need_pinfo);
 941       if (! inp->is_archive)
 942         {
 943           bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 4);
 944           bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 8);
 945           bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 10);
 946           strcpy (need_pnames, inp->filename);
 947         }
 948       else
 949         {
 950           char *verstr;
 951           int maj, min;
 952
 953           bfd_put_32 (output_bfd, (bfd_vma) 0x80000000, need_pinfo + 4);
 954           maj = 0;
 955           min = 0;
 956           verstr = strstr (inp->filename, ".so.");
 957           if (verstr != NULL)
 958             sscanf (verstr, ".so.%d.%d", &maj, &min);
 959           bfd_put_16 (output_bfd, (bfd_vma) maj, need_pinfo + 8);
 960           bfd_put_16 (output_bfd, (bfd_vma) min, need_pinfo + 10);
 961           strcpy (need_pnames, inp->local_sym_name + 2);
 962         }
 963
 964       c = (need_pinfo - need_contents) / NEED_ENTRY_SIZE;
 965       if (c + 1 >= need_entries)
 966         bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 12);
 967       else
 968         bfd_put_32 (output_bfd, (bfd_vma) (c + 1) * NEED_ENTRY_SIZE,
 969                     need_pinfo + 12);
 970
 971       need_pinfo += NEED_ENTRY_SIZE;
 972       need_pnames += strlen (need_pnames) + 1;
 973     }
 974 }
 975
 976 static char *
 977 gld${EMULATION_NAME}_get_script(isfile)
 978      int *isfile;
 979 EOF
 980
 981 if test -n "$COMPILE_IN"
 982 then
 983 # Scripts compiled in.
 984
 985 # sed commands to quote an ld script as a C string.
 986 sc="-f stringify.sed"
 987
 988 cat >>e${EMULATION_NAME}.c <<EOF
 989 {
 990   *isfile = 0;
 991
 992   if (link_info.relocateable && config.build_constructors)
 993     return
 994 EOF
 995 sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
 996 echo '  ; else if (link_info.relocateable) return'         >> e${EMULATION_NAME}.c
 997 sed $sc ldscripts/${EMULATION_NAME}.xr                     >> e${EMULATION_NAME}.c
 998 echo '  ; else if (!config.text_read_only) return'         >> e${EMULATION_NAME}.c
 999 sed $sc ldscripts/${EMULATION_NAME}.xbn                    >> e${EMULATION_NAME}.c
1000 echo '  ; else if (!config.magic_demand_paged) return'     >> e${EMULATION_NAME}.c
1001 sed $sc ldscripts/${EMULATION_NAME}.xn                     >> e${EMULATION_NAME}.c
1002 echo '  ; else return'                                     >> e${EMULATION_NAME}.c
1003 sed $sc ldscripts/${EMULATION_NAME}.x                      >> e${EMULATION_NAME}.c
1004 echo '; }'                                                 >> e${EMULATION_NAME}.c
1005
1006 else
1007 # Scripts read from the filesystem.
1008
1009 cat >>e${EMULATION_NAME}.c <<EOF
1010 {
1011   *isfile = 1;
1012
1013   if (link_info.relocateable && config.build_constructors)
1014     return "ldscripts/${EMULATION_NAME}.xu";
1015   else if (link_info.relocateable)
1016     return "ldscripts/${EMULATION_NAME}.xr";
1017   else if (!config.text_read_only)
1018     return "ldscripts/${EMULATION_NAME}.xbn";
1019   else if (!config.magic_demand_paged)
1020     return "ldscripts/${EMULATION_NAME}.xn";
1021   else
1022     return "ldscripts/${EMULATION_NAME}.x";
1023 }
1024 EOF
1025
1026 fi
1027
1028 cat >>e${EMULATION_NAME}.c <<EOF
1029
1030 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
1031 {
1032   gld${EMULATION_NAME}_before_parse,
1033   syslib_default,
1034   hll_default,
1035   after_parse_default,
1036   gld${EMULATION_NAME}_after_open,
1037   after_allocation_default,
1038   set_output_arch_default,
1039   ldemul_default_target,
1040   gld${EMULATION_NAME}_before_allocation,
1041   gld${EMULATION_NAME}_get_script,
1042   "${EMULATION_NAME}",
1043   "${OUTPUT_FORMAT}",
1044   NULL, /* finish */
1045   gld${EMULATION_NAME}_create_output_section_statements,
1046   NULL, /* open dynamic archive */
1047   NULL, /* place orphan */
1048   gld${EMULATION_NAME}_set_symbols,
1049   NULL, /* parse args */
1050   NULL, /* add_options */
1051   NULL, /* handle_option */
1052   NULL, /* unrecognized file */
1053   NULL, /* list options */
1054   NULL, /* recognized file */
1055   NULL, /* find_potential_libraries */
1056   NULL  /* new_vers_pattern */
1057 };
1058 EOF