ld/emultempl/armelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 ELFSIZE=32
   4 cat >e${EMULATION_NAME}.c <<EOF
   5 /* This file is is generated by a shell script.  DO NOT EDIT! */
   6
   7 /* emulate the original gld for the given ${EMULATION_NAME}
   8    Copyright (C) 1991, 93, 96, 97, 98, 1999 Free Software Foundation, Inc.
   9    Written by Steve Chamberlain steve@cygnus.com
  10
  11 This file is part of GLD, the Gnu Linker.
  12
  13 This program is free software; you can redistribute it and/or modify
  14 it under the terms of the GNU General Public License as published by
  15 the Free Software Foundation; either version 2 of the License, or
  16 (at your option) any later version.
  17
  18 This program is distributed in the hope that it will be useful,
  19 but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 GNU General Public License for more details.
  22
  23 You should have received a copy of the GNU General Public License
  24 along with this program; if not, write to the Free Software
  25 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  26
  27 #define TARGET_IS_${EMULATION_NAME}
  28
  29 #include "bfd.h"
  30 #include "sysdep.h"
  31 #include "bfdlink.h"
  32 #include "getopt.h"
  33
  34 #include "ld.h"
  35 #include "ldmain.h"
  36 #include "ldemul.h"
  37 #include "ldfile.h"
  38 #include "ldmisc.h"
  39
  40 #include "ldexp.h"
  41 #include "ldlang.h"
  42 #include "ldgram.h"
  43
  44 static boolean gld${EMULATION_NAME}_open_dynamic_archive
  45   PARAMS ((const char *, search_dirs_type *, lang_input_statement_type *));
  46 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
  47 static void gld${EMULATION_NAME}_check_needed
  48   PARAMS ((lang_input_statement_type *));
  49 static void gld${EMULATION_NAME}_stat_needed
  50   PARAMS ((lang_input_statement_type *));
  51 static boolean gld${EMULATION_NAME}_search_needed
  52   PARAMS ((const char *, const char *, int));
  53 static boolean gld${EMULATION_NAME}_try_needed PARAMS ((const char *, int));
  54 static void gld${EMULATION_NAME}_vercheck
  55   PARAMS ((lang_input_statement_type *));
  56 static void gld${EMULATION_NAME}_find_statement_assignment
  57   PARAMS ((lang_statement_union_type *));
  58 static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
  59 static boolean gld${EMULATION_NAME}_place_orphan
  60   PARAMS ((lang_input_statement_type *, asection *));
  61 static void gld${EMULATION_NAME}_place_section
  62   PARAMS ((lang_statement_union_type *));
  63 static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
  64 static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
  65 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
  66
  67 static void
  68 gld${EMULATION_NAME}_before_parse ()
  69 {
  70 #ifndef TARGET_                 /* I.e., if not generic.  */
  71   ldfile_set_output_arch ("`echo ${ARCH}`");
  72 #endif /* not TARGET_ */
  73 }
  74
  75 /* Try to open a dynamic archive.  This is where we know that ELF
  76    dynamic libraries have an extension of .so.  */
  77
  78 static boolean
  79 gld${EMULATION_NAME}_open_dynamic_archive (arch, search, entry)
  80      const char *arch;
  81      search_dirs_type *search;
  82      lang_input_statement_type *entry;
  83 {
  84   const char *filename;
  85   char *string;
  86
  87   if (! entry->is_archive)
  88     return false;
  89
  90   filename = entry->filename;
  91
  92   string = (char *) xmalloc (strlen (search->name)
  93                              + strlen (filename)
  94                              + strlen (arch)
  95                              + sizeof "/lib.so");
  96
  97   sprintf (string, "%s/lib%s%s.so", search->name, filename, arch);
  98
  99   if (! ldfile_try_open_bfd (string, entry))
 100     {
 101       free (string);
 102       return false;
 103     }
 104
 105   entry->filename = string;
 106
 107   /* We have found a dynamic object to include in the link.  The ELF
 108      backend linker will create a DT_NEEDED entry in the .dynamic
 109      section naming this file.  If this file includes a DT_SONAME
 110      entry, it will be used.  Otherwise, the ELF linker will just use
 111      the name of the file.  For an archive found by searching, like
 112      this one, the DT_NEEDED entry should consist of just the name of
 113      the file, without the path information used to find it.  Note
 114      that we only need to do this if we have a dynamic object; an
 115      archive will never be referenced by a DT_NEEDED entry.
 116
 117      FIXME: This approach--using bfd_elf_set_dt_needed_name--is not
 118      very pretty.  I haven't been able to think of anything that is
 119      pretty, though.  */
 120   if (bfd_check_format (entry->the_bfd, bfd_object)
 121       && (entry->the_bfd->flags & DYNAMIC) != 0)
 122     {
 123       char *needed_name;
 124
 125       ASSERT (entry->is_archive && entry->search_dirs_flag);
 126       needed_name = (char *) xmalloc (strlen (filename)
 127                                       + strlen (arch)
 128                                       + sizeof "lib.so");
 129       sprintf (needed_name, "lib%s%s.so", filename, arch);
 130       bfd_elf_set_dt_needed_name (entry->the_bfd, needed_name);
 131     }
 132
 133   return true;
 134 }
 135
 136 EOF
 137 if [ "x${host}" = "x${target}" ] ; then
 138   if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then
 139 cat >>e${EMULATION_NAME}.c <<EOF
 140
 141 /* For a native linker, check the file /etc/ld.so.conf for directories
 142    in which we may find shared libraries.  /etc/ld.so.conf is really
 143    only meaningful on Linux, but we check it on other systems anyhow.  */
 144
 145 static boolean gld${EMULATION_NAME}_check_ld_so_conf
 146   PARAMS ((const char *, int));
 147
 148 static boolean
 149 gld${EMULATION_NAME}_check_ld_so_conf (name, force)
 150      const char *name;
 151      int force;
 152 {
 153   static boolean initialized;
 154   static char *ld_so_conf;
 155
 156   if (! initialized)
 157     {
 158       FILE *f;
 159
 160       f = fopen ("/etc/ld.so.conf", FOPEN_RT);
 161       if (f != NULL)
 162         {
 163           char *b;
 164           size_t len, alloc;
 165           int c;
 166
 167           len = 0;
 168           alloc = 100;
 169           b = (char *) xmalloc (alloc);
 170
 171           while ((c = getc (f)) != EOF)
 172             {
 173               if (len + 1 >= alloc)
 174                 {
 175                   alloc *= 2;
 176                   b = (char *) xrealloc (b, alloc);
 177                 }
 178               if (c != ':'
 179                   && c != ' '
 180                   && c != '\t'
 181                   && c != '\n'
 182                   && c != ',')
 183                 {
 184                   b[len] = c;
 185                   ++len;
 186                 }
 187               else
 188                 {
 189                   if (len > 0 && b[len - 1] != ':')
 190                     {
 191                       b[len] = ':';
 192                       ++len;
 193                     }
 194                 }
 195             }
 196
 197           if (len > 0 && b[len - 1] == ':')
 198             --len;
 199
 200           if (len > 0)
 201             b[len] = '\0';
 202           else
 203             {
 204               free (b);
 205               b = NULL;
 206             }
 207
 208           fclose (f);
 209
 210           ld_so_conf = b;
 211         }
 212
 213       initialized = true;
 214     }
 215
 216   if (ld_so_conf == NULL)
 217     return false;
 218
 219   return gld${EMULATION_NAME}_search_needed (ld_so_conf, name, force);
 220 }
 221
 222 EOF
 223   fi
 224 fi
 225 cat >>e${EMULATION_NAME}.c <<EOF
 226
 227 /* These variables are required to pass information back and forth
 228    between after_open and check_needed and stat_needed and vercheck.  */
 229
 230 static struct bfd_link_needed_list *global_needed;
 231 static struct stat global_stat;
 232 static boolean global_found;
 233 static struct bfd_link_needed_list *global_vercheck_needed;
 234 static boolean global_vercheck_failed;
 235
 236 static void
 237 gld${EMULATION_NAME}_after_open ()
 238 {
 239   struct bfd_link_needed_list *needed, *l;
 240
 241   LANG_FOR_EACH_INPUT_STATEMENT (is)
 242     {
 243       /* The interworking bfd must be the last one to be processed */
 244       if (!is->next)
 245          bfd_elf32_arm_get_bfd_for_interworking (is->the_bfd, & link_info);
 246     }
 247
 248   /* We only need to worry about this when doing a final link.  */
 249   if (link_info.relocateable || link_info.shared)
 250     return;
 251
 252   /* Get the list of files which appear in DT_NEEDED entries in
 253      dynamic objects included in the link (often there will be none).
 254      For each such file, we want to track down the corresponding
 255      library, and include the symbol table in the link.  This is what
 256      the runtime dynamic linker will do.  Tracking the files down here
 257      permits one dynamic object to include another without requiring
 258      special action by the person doing the link.  Note that the
 259      needed list can actually grow while we are stepping through this
 260      loop.  */
 261   needed = bfd_elf_get_needed_list (output_bfd, &link_info);
 262   for (l = needed; l != NULL; l = l->next)
 263     {
 264       struct bfd_link_needed_list *ll;
 265       int force;
 266
 267       /* If we've already seen this file, skip it.  */
 268       for (ll = needed; ll != l; ll = ll->next)
 269         if (strcmp (ll->name, l->name) == 0)
 270           break;
 271       if (ll != l)
 272         continue;
 273
 274       /* See if this file was included in the link explicitly.  */
 275       global_needed = l;
 276       global_found = false;
 277       lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
 278       if (global_found)
 279         continue;
 280
 281       /* We need to find this file and include the symbol table.  We
 282          want to search for the file in the same way that the dynamic
 283          linker will search.  That means that we want to use
 284          rpath_link, rpath, then the environment variable
 285          LD_LIBRARY_PATH (native only), then the linker script
 286          LIB_SEARCH_DIRS.  We do not search using the -L arguments.
 287
 288          We search twice.  The first time, we skip objects which may
 289          introduce version mismatches.  The second time, we force
 290          their use.  See gld${EMULATION_NAME}_vercheck comment.  */
 291       for (force = 0; force < 2; force++)
 292         {
 293           const char *lib_path;
 294           size_t len;
 295           search_dirs_type *search;
 296
 297           if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link,
 298                                                   l->name, force))
 299             break;
 300           if (gld${EMULATION_NAME}_search_needed (command_line.rpath,
 301                                                   l->name, force))
 302             break;
 303           if (command_line.rpath_link == NULL
 304               && command_line.rpath == NULL)
 305             {
 306               lib_path = (const char *) getenv ("LD_RUN_PATH");
 307               if (gld${EMULATION_NAME}_search_needed (lib_path, l->name,
 308                                                       force))
 309                 break;
 310             }
 311 EOF
 312 if [ "x${host}" = "x${target}" ] ; then
 313   if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then
 314 cat >>e${EMULATION_NAME}.c <<EOF
 315           lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
 316           if (gld${EMULATION_NAME}_search_needed (lib_path, l->name, force))
 317             break;
 318 EOF
 319   fi
 320 fi
 321 cat >>e${EMULATION_NAME}.c <<EOF
 322           len = strlen (l->name);
 323           for (search = search_head; search != NULL; search = search->next)
 324             {
 325               char *filename;
 326
 327               if (search->cmdline)
 328                 continue;
 329               filename = (char *) xmalloc (strlen (search->name) + len + 2);
 330               sprintf (filename, "%s/%s", search->name, l->name);
 331               if (gld${EMULATION_NAME}_try_needed (filename, force))
 332                 break;
 333               free (filename);
 334             }
 335           if (search != NULL)
 336             break;
 337 EOF
 338 if [ "x${host}" = "x${target}" ] ; then
 339   if [ "x${DEFAULT_EMULATION}" = "x${EMULATION_NAME}" ] ; then
 340 cat >>e${EMULATION_NAME}.c <<EOF
 341           if (gld${EMULATION_NAME}_check_ld_so_conf (l->name, force))
 342             break;
 343 EOF
 344   fi
 345 fi
 346 cat >>e${EMULATION_NAME}.c <<EOF
 347         }
 348
 349       if (force < 2)
 350         continue;
 351
 352       einfo ("%P: warning: %s, needed by %B, not found (try using --rpath)\n",
 353              l->name, l->by);
 354     }
 355 }
 356
 357 /* Search for a needed file in a path.  */
 358
 359 static boolean
 360 gld${EMULATION_NAME}_search_needed (path, name, force)
 361      const char *path;
 362      const char *name;
 363      int force;
 364 {
 365   const char *s;
 366   size_t len;
 367
 368   if (path == NULL || *path == '\0')
 369     return false;
 370   len = strlen (name);
 371   while (1)
 372     {
 373       char *filename, *sset;
 374
 375       s = strchr (path, ':');
 376       if (s == NULL)
 377         s = path + strlen (path);
 378
 379       filename = (char *) xmalloc (s - path + len + 2);
 380       if (s == path)
 381         sset = filename;
 382       else
 383         {
 384           memcpy (filename, path, s - path);
 385           filename[s - path] = '/';
 386           sset = filename + (s - path) + 1;
 387         }
 388       strcpy (sset, name);
 389
 390       if (gld${EMULATION_NAME}_try_needed (filename, force))
 391         return true;
 392
 393       free (filename);
 394
 395       if (*s == '\0')
 396         break;
 397       path = s + 1;
 398     }
 399
 400   return false;
 401 }
 402
 403 /* This function is called for each possible name for a dynamic object
 404    named by a DT_NEEDED entry.  The FORCE parameter indicates whether
 405    to skip the check for a conflicting version.  */
 406
 407 static boolean
 408 gld${EMULATION_NAME}_try_needed (name, force)
 409      const char *name;
 410      int force;
 411 {
 412   bfd *abfd;
 413
 414   abfd = bfd_openr (name, bfd_get_target (output_bfd));
 415   if (abfd == NULL)
 416     return false;
 417   if (! bfd_check_format (abfd, bfd_object))
 418     {
 419       (void) bfd_close (abfd);
 420       return false;
 421     }
 422   if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
 423     {
 424       (void) bfd_close (abfd);
 425       return false;
 426     }
 427
 428   /* Check whether this object would include any conflicting library
 429      versions.  If FORCE is set, then we skip this check; we use this
 430      the second time around, if we couldn't find any compatible
 431      instance of the shared library.  */
 432
 433   if (! force)
 434     {
 435       struct bfd_link_needed_list *needed;
 436
 437       if (! bfd_elf_get_bfd_needed_list (abfd, &needed))
 438         einfo ("%F%P:%B: bfd_elf_get_bfd_needed_list failed: %E\n", abfd);
 439
 440       if (needed != NULL)
 441         {
 442           global_vercheck_needed = needed;
 443           global_vercheck_failed = false;
 444           lang_for_each_input_file (gld${EMULATION_NAME}_vercheck);
 445           if (global_vercheck_failed)
 446             {
 447               (void) bfd_close (abfd);
 448               /* Return false to force the caller to move on to try
 449                  another file on the search path.  */
 450               return false;
 451             }
 452
 453           /* But wait!  It gets much worse.  On Linux, if a shared
 454              library does not use libc at all, we are supposed to skip
 455              it the first time around in case we encounter a shared
 456              library later on with the same name which does use the
 457              version of libc that we want.  This is much too horrible
 458              to use on any system other than Linux.  */
 459
 460 EOF
 461 case ${target} in
 462   *-*-linux-gnu*)
 463     cat >>e${EMULATION_NAME}.c <<EOF
 464           {
 465             struct bfd_link_needed_list *l;
 466
 467             for (l = needed; l != NULL; l = l->next)
 468               if (strncmp (l->name, "libc.so", 7) == 0)
 469                 break;
 470             if (l == NULL)
 471               {
 472                 (void) bfd_close (abfd);
 473                 return false;
 474               }
 475           }
 476
 477 EOF
 478     ;;
 479 esac
 480 cat >>e${EMULATION_NAME}.c <<EOF
 481         }
 482     }
 483
 484   /* We've found a dynamic object matching the DT_NEEDED entry.  */
 485
 486   /* We have already checked that there is no other input file of the
 487      same name.  We must now check again that we are not including the
 488      same file twice.  We need to do this because on many systems
 489      libc.so is a symlink to, e.g., libc.so.1.  The SONAME entry will
 490      reference libc.so.1.  If we have already included libc.so, we
 491      don't want to include libc.so.1 if they are the same file, and we
 492      can only check that using stat.  */
 493
 494   if (bfd_stat (abfd, &global_stat) != 0)
 495     einfo ("%F%P:%B: bfd_stat failed: %E\n", abfd);
 496   global_found = false;
 497   lang_for_each_input_file (gld${EMULATION_NAME}_stat_needed);
 498   if (global_found)
 499     {
 500       /* Return true to indicate that we found the file, even though
 501          we aren't going to do anything with it.  */
 502       return true;
 503     }
 504
 505   /* Tell the ELF backend that don't want the output file to have a
 506      DT_NEEDED entry for this file.  */
 507   bfd_elf_set_dt_needed_name (abfd, "");
 508
 509   /* Add this file into the symbol table.  */
 510   if (! bfd_link_add_symbols (abfd, &link_info))
 511     einfo ("%F%B: could not read symbols: %E\n", abfd);
 512
 513   return true;
 514 }
 515
 516 /* See if an input file matches a DT_NEEDED entry by name.  */
 517
 518 static void
 519 gld${EMULATION_NAME}_check_needed (s)
 520      lang_input_statement_type *s;
 521 {
 522   if (global_found)
 523     return;
 524
 525   if (s->filename != NULL
 526       && strcmp (s->filename, global_needed->name) == 0)
 527     {
 528       global_found = true;
 529       return;
 530     }
 531
 532   if (s->the_bfd != NULL)
 533     {
 534       const char *soname;
 535
 536       soname = bfd_elf_get_dt_soname (s->the_bfd);
 537       if (soname != NULL
 538           && strcmp (soname, global_needed->name) == 0)
 539         {
 540           global_found = true;
 541           return;
 542         }
 543     }
 544
 545   if (s->search_dirs_flag
 546       && s->filename != NULL
 547       && strchr (global_needed->name, '/') == NULL)
 548     {
 549       const char *f;
 550
 551       f = strrchr (s->filename, '/');
 552       if (f != NULL
 553           && strcmp (f + 1, global_needed->name) == 0)
 554         {
 555           global_found = true;
 556           return;
 557         }
 558     }
 559 }
 560
 561 /* See if an input file matches a DT_NEEDED entry by running stat on
 562    the file.  */
 563
 564 static void
 565 gld${EMULATION_NAME}_stat_needed (s)
 566      lang_input_statement_type *s;
 567 {
 568   struct stat st;
 569   const char *suffix;
 570   const char *soname;
 571   const char *f;
 572
 573   if (global_found)
 574     return;
 575   if (s->the_bfd == NULL)
 576     return;
 577
 578   if (bfd_stat (s->the_bfd, &st) != 0)
 579     {
 580       einfo ("%P:%B: bfd_stat failed: %E\n", s->the_bfd);
 581       return;
 582     }
 583
 584   if (st.st_dev == global_stat.st_dev
 585       && st.st_ino == global_stat.st_ino)
 586     {
 587       global_found = true;
 588       return;
 589     }
 590
 591   /* We issue a warning if it looks like we are including two
 592      different versions of the same shared library.  For example,
 593      there may be a problem if -lc picks up libc.so.6 but some other
 594      shared library has a DT_NEEDED entry of libc.so.5.  This is a
 595      hueristic test, and it will only work if the name looks like
 596      NAME.so.VERSION.  FIXME: Depending on file names is error-prone.
 597      If we really want to issue warnings about mixing version numbers
 598      of shared libraries, we need to find a better way.  */
 599
 600   if (strchr (global_needed->name, '/') != NULL)
 601     return;
 602   suffix = strstr (global_needed->name, ".so.");
 603   if (suffix == NULL)
 604     return;
 605   suffix += sizeof ".so." - 1;
 606
 607   soname = bfd_elf_get_dt_soname (s->the_bfd);
 608   if (soname == NULL)
 609     soname = s->filename;
 610
 611   f = strrchr (soname, '/');
 612   if (f != NULL)
 613     ++f;
 614   else
 615     f = soname;
 616
 617   if (strncmp (f, global_needed->name, suffix - global_needed->name) == 0)
 618     einfo ("%P: warning: %s, needed by %B, may conflict with %s\n",
 619            global_needed->name, global_needed->by, f);
 620 }
 621
 622 /* On Linux, it's possible to have different versions of the same
 623    shared library linked against different versions of libc.  The
 624    dynamic linker somehow tags which libc version to use in
 625    /etc/ld.so.cache, and, based on the libc that it sees in the
 626    executable, chooses which version of the shared library to use.
 627
 628    We try to do a similar check here by checking whether this shared
 629    library needs any other shared libraries which may conflict with
 630    libraries we have already included in the link.  If it does, we
 631    skip it, and try to find another shared library farther on down the
 632    link path.
 633
 634    This is called via lang_for_each_input_file.
 635    GLOBAL_VERCHECK_NEEDED is the list of objects needed by the object
 636    which we ar checking.  This sets GLOBAL_VERCHECK_FAILED if we find
 637    a conflicting version.  */
 638
 639 static void
 640 gld${EMULATION_NAME}_vercheck (s)
 641      lang_input_statement_type *s;
 642 {
 643   const char *soname, *f;
 644   struct bfd_link_needed_list *l;
 645
 646   if (global_vercheck_failed)
 647     return;
 648   if (s->the_bfd == NULL
 649       || (bfd_get_file_flags (s->the_bfd) & DYNAMIC) == 0)
 650     return;
 651
 652   soname = bfd_elf_get_dt_soname (s->the_bfd);
 653   if (soname == NULL)
 654     soname = bfd_get_filename (s->the_bfd);
 655
 656   f = strrchr (soname, '/');
 657   if (f != NULL)
 658     ++f;
 659   else
 660     f = soname;
 661
 662   for (l = global_vercheck_needed; l != NULL; l = l->next)
 663     {
 664       const char *suffix;
 665
 666       if (strcmp (f, l->name) == 0)
 667         {
 668           /* Probably can't happen, but it's an easy check.  */
 669           continue;
 670         }
 671
 672       if (strchr (l->name, '/') != NULL)
 673         continue;
 674
 675       suffix = strstr (l->name, ".so.");
 676       if (suffix == NULL)
 677         continue;
 678
 679       suffix += sizeof ".so." - 1;
 680
 681       if (strncmp (f, l->name, suffix - l->name) == 0)
 682         {
 683           /* Here we know that S is a dynamic object FOO.SO.VER1, and
 684              the object we are considering needs a dynamic object
 685              FOO.SO.VER2, and VER1 and VER2 are different.  This
 686              appears to be a version mismatch, so we tell the caller
 687              to try a different version of this library.  */
 688           global_vercheck_failed = true;
 689           return;
 690         }
 691     }
 692 }
 693
 694 /* Place an orphan section.  We use this to put random SHF_ALLOC
 695    sections in the right segment.  */
 696
 697 static asection *hold_section;
 698 static lang_output_section_statement_type *hold_use;
 699 static lang_output_section_statement_type *hold_text;
 700 static lang_output_section_statement_type *hold_rodata;
 701 static lang_output_section_statement_type *hold_data;
 702 static lang_output_section_statement_type *hold_bss;
 703 static lang_output_section_statement_type *hold_rel;
 704 static lang_output_section_statement_type *hold_interp;
 705
 706 /*ARGSUSED*/
 707 static boolean
 708 gld${EMULATION_NAME}_place_orphan (file, s)
 709      lang_input_statement_type *file;
 710      asection *s;
 711 {
 712   lang_output_section_statement_type *place;
 713   asection *snew, **pps;
 714   lang_statement_list_type *old;
 715   lang_statement_list_type add;
 716   etree_type *address;
 717   const char *secname, *ps;
 718   const char *outsecname;
 719   lang_output_section_statement_type *os;
 720
 721   if ((s->flags & SEC_ALLOC) == 0)
 722     return false;
 723
 724   /* Look through the script to see where to place this section.  */
 725   hold_section = s;
 726   hold_use = NULL;
 727   lang_for_each_statement (gld${EMULATION_NAME}_place_section);
 728
 729   if (hold_use != NULL)
 730     {
 731       /* We have already placed a section with this name.  */
 732       wild_doit (&hold_use->children, s, hold_use, file);
 733       return true;
 734     }
 735
 736   secname = bfd_get_section_name (s->owner, s);
 737
 738   /* If this is a final link, then always put .gnu.warning.SYMBOL
 739      sections into the .text section to get them out of the way.  */
 740   if (! link_info.shared
 741       && ! link_info.relocateable
 742       && strncmp (secname, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0
 743       && hold_text != NULL)
 744     {
 745       wild_doit (&hold_text->children, s, hold_text, file);
 746       return true;
 747     }
 748
 749   /* Decide which segment the section should go in based on the
 750      section name and section flags.  We put loadable .note sections
 751      right after the .interp section, so that the PT_NOTE segment is
 752      stored right after the program headers where the OS can read it
 753      in the first page.  */
 754   place = NULL;
 755   if (s->flags & SEC_EXCLUDE)
 756     return false;
 757   else if ((s->flags & SEC_LOAD) != 0
 758       && strncmp (secname, ".note", 4) == 0
 759       && hold_interp != NULL)
 760     place = hold_interp;
 761   else if ((s->flags & SEC_HAS_CONTENTS) == 0
 762            && hold_bss != NULL)
 763     place = hold_bss;
 764   else if ((s->flags & SEC_READONLY) == 0
 765            && hold_data != NULL)
 766     place = hold_data;
 767   else if (strncmp (secname, ".rel", 4) == 0
 768            && hold_rel != NULL)
 769     place = hold_rel;
 770   else if ((s->flags & SEC_CODE) == 0
 771            && (s->flags & SEC_READONLY) != 0
 772            && hold_rodata != NULL)
 773     place = hold_rodata;
 774   else if ((s->flags & SEC_READONLY) != 0
 775            && hold_text != NULL)
 776     place = hold_text;
 777   if (place == NULL)
 778     return false;
 779
 780   /* Choose a unique name for the section.  This will be needed if the
 781      same section name appears in the input file with different
 782      loadable or allocateable characteristics.  */
 783   outsecname = secname;
 784   if (bfd_get_section_by_name (output_bfd, outsecname) != NULL)
 785     {
 786       unsigned int len;
 787       char *newname;
 788       unsigned int i;
 789
 790       len = strlen (outsecname);
 791       newname = xmalloc (len + 5);
 792       strcpy (newname, outsecname);
 793       i = 0;
 794       do
 795         {
 796           sprintf (newname + len, "%d", i);
 797           ++i;
 798         }
 799       while (bfd_get_section_by_name (output_bfd, newname) != NULL);
 800
 801       outsecname = newname;
 802     }
 803
 804   /* Create the section in the output file, and put it in the right
 805      place.  This shuffling is to make the output file look neater.  */
 806   snew = bfd_make_section (output_bfd, outsecname);
 807   if (snew == NULL)
 808       einfo ("%P%F: output format %s cannot represent section called %s\n",
 809              output_bfd->xvec->name, outsecname);
 810   if (place->bfd_section != NULL)
 811     {
 812       for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next)
 813         ;
 814       *pps = snew->next;
 815       snew->next = place->bfd_section->next;
 816       place->bfd_section->next = snew;
 817     }
 818
 819   /* Start building a list of statements for this section.  */
 820   old = stat_ptr;
 821   stat_ptr = &add;
 822   lang_list_init (stat_ptr);
 823
 824   /* If the name of the section is representable in C, then create
 825      symbols to mark the start and the end of the section.  */
 826   for (ps = outsecname; *ps != '\0'; ps++)
 827     if (! isalnum ((unsigned char) *ps) && *ps != '_')
 828       break;
 829   if (*ps == '\0' && config.build_constructors)
 830     {
 831       char *symname;
 832
 833       symname = (char *) xmalloc (ps - outsecname + sizeof "__start_");
 834       sprintf (symname, "__start_%s", outsecname);
 835       lang_add_assignment (exp_assop ('=', symname,
 836                                       exp_unop (ALIGN_K,
 837                                                 exp_intop ((bfd_vma) 1
 838                                                            << s->alignment_power))));
 839     }
 840
 841   if (! link_info.relocateable)
 842     address = NULL;
 843   else
 844     address = exp_intop ((bfd_vma) 0);
 845
 846   lang_enter_output_section_statement (outsecname, address, 0,
 847                                        (bfd_vma) 0,
 848                                        (etree_type *) NULL,
 849                                        (etree_type *) NULL,
 850                                        (etree_type *) NULL);
 851
 852   os = lang_output_section_statement_lookup (outsecname);
 853   wild_doit (&os->children, s, os, file);
 854
 855   lang_leave_output_section_statement
 856     ((bfd_vma) 0, "*default*", (struct lang_output_section_phdr_list *) NULL);
 857   stat_ptr = &add;
 858
 859   if (*ps == '\0' && config.build_constructors)
 860     {
 861       char *symname;
 862
 863       symname = (char *) xmalloc (ps - outsecname + sizeof "__stop_");
 864       sprintf (symname, "__stop_%s", outsecname);
 865       lang_add_assignment (exp_assop ('=', symname,
 866                                       exp_nameop (NAME, ".")));
 867     }
 868
 869   /* Now stick the new statement list right after PLACE.  */
 870   *add.tail = place->header.next;
 871   place->header.next = add.head;
 872
 873   stat_ptr = old;
 874
 875   return true;
 876 }
 877
 878 static void
 879 gld${EMULATION_NAME}_place_section (s)
 880      lang_statement_union_type *s;
 881 {
 882   lang_output_section_statement_type *os;
 883
 884   if (s->header.type != lang_output_section_statement_enum)
 885     return;
 886
 887   os = &s->output_section_statement;
 888
 889   if (strcmp (os->name, hold_section->name) == 0
 890       && os->bfd_section != NULL
 891       && ((hold_section->flags & (SEC_LOAD | SEC_ALLOC))
 892           == (os->bfd_section->flags & (SEC_LOAD | SEC_ALLOC))))
 893     hold_use = os;
 894
 895   if (strcmp (os->name, ".text") == 0)
 896     hold_text = os;
 897   else if (strcmp (os->name, ".rodata") == 0)
 898     hold_rodata = os;
 899   else if (strcmp (os->name, ".data") == 0)
 900     hold_data = os;
 901   else if (strcmp (os->name, ".bss") == 0)
 902     hold_bss = os;
 903   else if (hold_rel == NULL
 904            && os->bfd_section != NULL
 905            && (os->bfd_section->flags & SEC_ALLOC) != 0
 906            && strncmp (os->name, ".rel", 4) == 0)
 907     hold_rel = os;
 908   else if (strcmp (os->name, ".interp") == 0)
 909     hold_interp = os;
 910 }
 911
 912 /* Look through an expression for an assignment statement.  */
 913
 914 static void
 915 gld${EMULATION_NAME}_find_exp_assignment (exp)
 916      etree_type *exp;
 917 {
 918   struct bfd_link_hash_entry *h;
 919
 920   switch (exp->type.node_class)
 921     {
 922     case etree_provide:
 923       h = bfd_link_hash_lookup (link_info.hash, exp->assign.dst,
 924                                 false, false, false);
 925       if (h == NULL)
 926         break;
 927
 928       /* We call record_link_assignment even if the symbol is defined.
 929          This is because if it is defined by a dynamic object, we
 930          actually want to use the value defined by the linker script,
 931          not the value from the dynamic object (because we are setting
 932          symbols like etext).  If the symbol is defined by a regular
 933          object, then, as it happens, calling record_link_assignment
 934          will do no harm.  */
 935
 936       /* Fall through.  */
 937     case etree_assign:
 938       if (strcmp (exp->assign.dst, ".") != 0)
 939         {
 940           if (! (bfd_elf${ELFSIZE}_record_link_assignment
 941                  (output_bfd, &link_info, exp->assign.dst,
 942                   exp->type.node_class == etree_provide ? true : false)))
 943             einfo ("%P%F: failed to record assignment to %s: %E\n",
 944                    exp->assign.dst);
 945         }
 946       gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
 947       break;
 948
 949     case etree_binary:
 950       gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
 951       gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
 952       break;
 953
 954     case etree_trinary:
 955       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond);
 956       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
 957       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
 958       break;
 959
 960     case etree_unary:
 961       gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
 962       break;
 963
 964     default:
 965       break;
 966     }
 967 }
 968
 969 /* This is called by the before_allocation routine via
 970    lang_for_each_statement.  It locates any assignment statements, and
 971    tells the ELF backend about them, in case they are assignments to
 972    symbols which are referred to by dynamic objects.  */
 973
 974 static void
 975 gld${EMULATION_NAME}_find_statement_assignment (s)
 976      lang_statement_union_type *s;
 977 {
 978   if (s->header.type == lang_assignment_statement_enum)
 979     gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
 980 }
 981
 982 /* This is called after the sections have been attached to output
 983    sections, but before any sizes or addresses have been set.  */
 984
 985 static void
 986 gld${EMULATION_NAME}_before_allocation ()
 987 {
 988   const char *rpath;
 989   asection *sinterp;
 990
 991   /* If we are going to make any variable assignments, we need to let
 992      the ELF backend know about them in case the variables are
 993      referred to by dynamic objects.  */
 994   lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment);
 995
 996   /* Let the ELF backend work out the sizes of any sections required
 997      by dynamic linking.  */
 998   rpath = command_line.rpath;
 999   if (rpath == NULL)
1000     rpath = (const char *) getenv ("LD_RUN_PATH");
1001   if (! (bfd_elf${ELFSIZE}_size_dynamic_sections
1002          (output_bfd, command_line.soname, rpath,
1003           command_line.export_dynamic, command_line.filter_shlib,
1004           (const char * const *) command_line.auxiliary_filters,
1005           &link_info, &sinterp, lang_elf_version_info)))
1006     einfo ("%P%F: failed to set dynamic section sizes: %E\n");
1007
1008   /* Let the user override the dynamic linker we are using.  */
1009   if (command_line.interpreter != NULL
1010       && sinterp != NULL)
1011     {
1012       sinterp->contents = (bfd_byte *) command_line.interpreter;
1013       sinterp->_raw_size = strlen (command_line.interpreter) + 1;
1014     }
1015
1016   /* Look for any sections named .gnu.warning.  As a GNU extensions,
1017      we treat such sections as containing warning messages.  We print
1018      out the warning message, and then zero out the section size so
1019      that it does not get copied into the output file.  */
1020
1021   {
1022     LANG_FOR_EACH_INPUT_STATEMENT (is)
1023       {
1024         asection *s;
1025         bfd_size_type sz;
1026         char *msg;
1027         boolean ret;
1028
1029         if (is->just_syms_flag)
1030           continue;
1031
1032         s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning");
1033         if (s == NULL)
1034           continue;
1035
1036         sz = bfd_section_size (is->the_bfd, s);
1037         msg = xmalloc ((size_t) sz + 1);
1038         if (! bfd_get_section_contents (is->the_bfd, s, msg, (file_ptr) 0, sz))
1039           einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n",
1040                  is->the_bfd);
1041         msg[sz] = '\0';
1042         ret = link_info.callbacks->warning (&link_info, msg,
1043                                             (const char *) NULL,
1044                                             is->the_bfd, (asection *) NULL,
1045                                             (bfd_vma) 0);
1046         ASSERT (ret);
1047         free (msg);
1048
1049         /* Clobber the section size, so that we don't waste copying the
1050            warning into the output file.  */
1051         s->_raw_size = 0;
1052       }
1053   }
1054
1055   /* we should be able to set the size of the interworking stub section */
1056
1057   /* Here we rummage through the found bfds to collect glue information */
1058   /* FIXME: should this be based on a command line option? krk@cygnus.com */
1059   {
1060     LANG_FOR_EACH_INPUT_STATEMENT (is)
1061       {
1062         if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, &link_info))
1063           {
1064             /* xgettext:c-format */
1065             einfo (_("Errors encountered processing file %s"), is->filename);
1066           }
1067       }
1068   }
1069
1070   /* We have seen it all. Allocate it, and carry on */
1071   bfd_elf32_arm_allocate_interworking_sections (& link_info);
1072 }
1073
1074 static char *
1075 gld${EMULATION_NAME}_get_script (isfile)
1076      int *isfile;
1077 EOF
1078
1079 if test -n "$COMPILE_IN"
1080 then
1081 # Scripts compiled in.
1082
1083 # sed commands to quote an ld script as a C string.
1084 sc="-f ${srcdir}/emultempl/stringify.sed"
1085
1086 cat >>e${EMULATION_NAME}.c <<EOF
1087 {
1088   *isfile = 0;
1089
1090   if (link_info.relocateable == true && config.build_constructors == true)
1091     return
1092 EOF
1093 sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
1094 echo '  ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
1095 sed $sc ldscripts/${EMULATION_NAME}.xr                     >> e${EMULATION_NAME}.c
1096 echo '  ; else if (!config.text_read_only) return'         >> e${EMULATION_NAME}.c
1097 sed $sc ldscripts/${EMULATION_NAME}.xbn                    >> e${EMULATION_NAME}.c
1098 echo '  ; else if (!config.magic_demand_paged) return'     >> e${EMULATION_NAME}.c
1099 sed $sc ldscripts/${EMULATION_NAME}.xn                     >> e${EMULATION_NAME}.c
1100 echo '  ; else return'                                     >> e${EMULATION_NAME}.c
1101 sed $sc ldscripts/${EMULATION_NAME}.x                      >> e${EMULATION_NAME}.c
1102 echo '; }'                                                 >> e${EMULATION_NAME}.c
1103
1104 else
1105 # Scripts read from the filesystem.
1106
1107 cat >>e${EMULATION_NAME}.c <<EOF
1108 {
1109   *isfile = 1;
1110
1111   if (link_info.relocateable == true && config.build_constructors == true)
1112     return "ldscripts/${EMULATION_NAME}.xu";
1113   else if (link_info.relocateable == true)
1114     return "ldscripts/${EMULATION_NAME}.xr";
1115   else if (!config.text_read_only)
1116     return "ldscripts/${EMULATION_NAME}.xbn";
1117   else if (!config.magic_demand_paged)
1118     return "ldscripts/${EMULATION_NAME}.xn";
1119   else
1120     return "ldscripts/${EMULATION_NAME}.x";
1121 }
1122 EOF
1123
1124 fi
1125
1126 cat >>e${EMULATION_NAME}.c <<EOF
1127
1128 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
1129 {
1130   gld${EMULATION_NAME}_before_parse,
1131   syslib_default,
1132   hll_default,
1133   after_parse_default,
1134   gld${EMULATION_NAME}_after_open,
1135   after_allocation_default,
1136   set_output_arch_default,
1137   ldemul_default_target,
1138   gld${EMULATION_NAME}_before_allocation,
1139   gld${EMULATION_NAME}_get_script,
1140   "${EMULATION_NAME}",
1141   "${OUTPUT_FORMAT}",
1142   NULL, /* finish */
1143   NULL, /* create output section statements */
1144   gld${EMULATION_NAME}_open_dynamic_archive,
1145   gld${EMULATION_NAME}_place_orphan,
1146   NULL, /* set_symbols */
1147   NULL,
1148   NULL, /* unrecognised file */
1149   NULL
1150 };
1151 EOF