ld/emultempl/hppaelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003, 2004,
   3 #   2005 Free Software Foundation, Inc.
   4 #
   5 # This file is part of GLD, the Gnu Linker.
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program; if not, write to the Free Software
  19 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20 #
  21
  22 # This file is sourced from elf32.em, and defines extra hppa-elf
  23 # specific routines.
  24 #
  25 cat >>e${EMULATION_NAME}.c <<EOF
  26
  27 #include "ldctor.h"
  28 #include "elf32-hppa.h"
  29
  30
  31 /* Fake input file for stubs.  */
  32 static lang_input_statement_type *stub_file;
  33
  34 /* Type of import/export stubs to build.  For a single sub-space model,
  35    we can build smaller import stubs and there is no need for export
  36    stubs.  */
  37 static int multi_subspace = 0;
  38
  39 /* Maximum size of a group of input sections that can be handled by
  40    one stub section.  A value of +/-1 indicates the bfd back-end
  41    should use a suitable default size.  */
  42 static bfd_signed_vma group_size = 1;
  43
  44 /* Stops the linker merging .text sections on a relocatable link,
  45    and adds millicode library to the list of input files.  */
  46
  47 static void
  48 hppaelf_after_parse (void)
  49 {
  50   if (link_info.relocatable)
  51     lang_add_unique (".text");
  52
  53   /* Enable this once we split millicode stuff from libgcc:
  54      lang_add_input_file ("milli",
  55                           lang_input_file_is_l_enum,
  56                           NULL);
  57   */
  58 }
  59
  60 /* This is called before the input files are opened.  We create a new
  61    fake input file to hold the stub sections.  */
  62
  63 static void
  64 hppaelf_create_output_section_statements (void)
  65 {
  66   extern const bfd_target bfd_elf32_hppa_linux_vec;
  67   extern const bfd_target bfd_elf32_hppa_nbsd_vec;
  68   extern const bfd_target bfd_elf32_hppa_vec;
  69
  70   if (link_info.hash->creator != &bfd_elf32_hppa_linux_vec
  71       && link_info.hash->creator != &bfd_elf32_hppa_nbsd_vec
  72       && link_info.hash->creator != &bfd_elf32_hppa_vec)
  73     return;
  74
  75   stub_file = lang_add_input_file ("linker stubs",
  76                                    lang_input_file_is_fake_enum,
  77                                    NULL);
  78   stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
  79   if (stub_file->the_bfd == NULL
  80       || ! bfd_set_arch_mach (stub_file->the_bfd,
  81                               bfd_get_arch (output_bfd),
  82                               bfd_get_mach (output_bfd)))
  83     {
  84       einfo ("%X%P: can not create BFD %E\n");
  85       return;
  86     }
  87
  88   stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
  89   ldlang_add_file (stub_file);
  90 }
  91
  92
  93 struct hook_stub_info
  94 {
  95   lang_statement_list_type add;
  96   asection *input_section;
  97 };
  98
  99 /* Traverse the linker tree to find the spot where the stub goes.  */
 100
 101 static bfd_boolean
 102 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
 103 {
 104   lang_statement_union_type *l;
 105   bfd_boolean ret;
 106
 107   for (; (l = *lp) != NULL; lp = &l->header.next)
 108     {
 109       switch (l->header.type)
 110         {
 111         case lang_constructors_statement_enum:
 112           ret = hook_in_stub (info, &constructor_list.head);
 113           if (ret)
 114             return ret;
 115           break;
 116
 117         case lang_output_section_statement_enum:
 118           ret = hook_in_stub (info,
 119                               &l->output_section_statement.children.head);
 120           if (ret)
 121             return ret;
 122           break;
 123
 124         case lang_wild_statement_enum:
 125           ret = hook_in_stub (info, &l->wild_statement.children.head);
 126           if (ret)
 127             return ret;
 128           break;
 129
 130         case lang_group_statement_enum:
 131           ret = hook_in_stub (info, &l->group_statement.children.head);
 132           if (ret)
 133             return ret;
 134           break;
 135
 136         case lang_input_section_enum:
 137           if (l->input_section.section == info->input_section)
 138             {
 139               /* We've found our section.  Insert the stub immediately
 140                  before its associated input section.  */
 141               *lp = info->add.head;
 142               *(info->add.tail) = l;
 143               return TRUE;
 144             }
 145           break;
 146
 147         case lang_data_statement_enum:
 148         case lang_reloc_statement_enum:
 149         case lang_object_symbols_statement_enum:
 150         case lang_output_statement_enum:
 151         case lang_target_statement_enum:
 152         case lang_input_statement_enum:
 153         case lang_assignment_statement_enum:
 154         case lang_padding_statement_enum:
 155         case lang_address_statement_enum:
 156         case lang_fill_statement_enum:
 157           break;
 158
 159         default:
 160           FAIL ();
 161           break;
 162         }
 163     }
 164   return FALSE;
 165 }
 166
 167
 168 /* Call-back for elf32_hppa_size_stubs.  */
 169
 170 /* Create a new stub section, and arrange for it to be linked
 171    immediately before INPUT_SECTION.  */
 172
 173 static asection *
 174 hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
 175 {
 176   asection *stub_sec;
 177   flagword flags;
 178   asection *output_section;
 179   const char *secname;
 180   lang_output_section_statement_type *os;
 181   struct hook_stub_info info;
 182
 183   stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
 184   if (stub_sec == NULL)
 185     goto err_ret;
 186
 187   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 188            | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 189   if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
 190     goto err_ret;
 191
 192   output_section = input_section->output_section;
 193   secname = bfd_get_section_name (output_section->owner, output_section);
 194   os = lang_output_section_find (secname);
 195
 196   info.input_section = input_section;
 197   lang_list_init (&info.add);
 198   lang_add_section (&info.add, stub_sec, os, stub_file);
 199
 200   if (info.add.head == NULL)
 201     goto err_ret;
 202
 203   if (hook_in_stub (&info, &os->children.head))
 204     return stub_sec;
 205
 206  err_ret:
 207   einfo ("%X%P: can not make stub section: %E\n");
 208   return NULL;
 209 }
 210
 211
 212 /* Another call-back for elf32_hppa_size_stubs.  */
 213
 214 static void
 215 hppaelf_layout_sections_again (void)
 216 {
 217   /* If we have changed sizes of the stub sections, then we need
 218      to recalculate all the section offsets.  This may mean we need to
 219      add even more stubs.  */
 220   lang_reset_memory_regions ();
 221
 222   /* Resize the sections.  */
 223   lang_size_sections (stat_ptr->head, abs_output_section,
 224                       &stat_ptr->head, 0, (bfd_vma) 0, NULL, TRUE);
 225
 226   /* Redo special stuff.  */
 227   ldemul_after_allocation ();
 228
 229   /* Do the assignments again.  */
 230   lang_do_assignments (stat_ptr->head, abs_output_section,
 231                        (fill_type *) 0, (bfd_vma) 0);
 232 }
 233
 234
 235 static void
 236 build_section_lists (lang_statement_union_type *statement)
 237 {
 238   if (statement->header.type == lang_input_section_enum
 239       && !statement->input_section.ifile->just_syms_flag
 240       && (statement->input_section.section->flags & SEC_EXCLUDE) == 0
 241       && statement->input_section.section->output_section != NULL
 242       && statement->input_section.section->output_section->owner == output_bfd)
 243     {
 244       elf32_hppa_next_input_section (&link_info,
 245                                      statement->input_section.section);
 246     }
 247 }
 248
 249
 250 /* Final emulation specific call.  For the PA we use this opportunity
 251    to build linker stubs.  */
 252
 253 static void
 254 hppaelf_finish (void)
 255 {
 256   /* If generating a relocatable output file, then we don't
 257      have to examine the relocs.  */
 258   if (stub_file != NULL && !link_info.relocatable)
 259     {
 260       int ret = elf32_hppa_setup_section_lists (output_bfd, &link_info);
 261
 262       if (ret != 0)
 263         {
 264           if (ret < 0)
 265             {
 266               einfo ("%X%P: can not size stub section: %E\n");
 267               return;
 268             }
 269
 270           lang_for_each_statement (build_section_lists);
 271
 272           /* Call into the BFD backend to do the real work.  */
 273           if (! elf32_hppa_size_stubs (output_bfd,
 274                                        stub_file->the_bfd,
 275                                        &link_info,
 276                                        multi_subspace,
 277                                        group_size,
 278                                        &hppaelf_add_stub_section,
 279                                        &hppaelf_layout_sections_again))
 280             {
 281               einfo ("%X%P: can not size stub section: %E\n");
 282               return;
 283             }
 284         }
 285     }
 286
 287   if (! link_info.relocatable)
 288     {
 289       /* Set the global data pointer.  */
 290       if (! elf32_hppa_set_gp (output_bfd, &link_info))
 291         {
 292           einfo ("%X%P: can not set gp\n");
 293           return;
 294         }
 295
 296       /* Now build the linker stubs.  */
 297       if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
 298         {
 299           if (! elf32_hppa_build_stubs (&link_info))
 300             {
 301               einfo ("%X%P: can not build stubs: %E\n");
 302               return;
 303             }
 304         }
 305     }
 306
 307   gld${EMULATION_NAME}_finish ();
 308 }
 309
 310
 311 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 312    check_needed routines.  */
 313
 314 static void (*real_func) (lang_input_statement_type *);
 315
 316 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
 317 {
 318   if (l != stub_file)
 319     (*real_func) (l);
 320 }
 321
 322 static void
 323 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
 324 {
 325   real_func = func;
 326   lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
 327 }
 328
 329 #define lang_for_each_input_file hppa_lang_for_each_input_file
 330
 331 EOF
 332
 333 # Define some shell vars to insert bits of code into the standard elf
 334 # parse_args and list_options functions.
 335 #
 336 PARSE_AND_LIST_PROLOGUE='
 337 #define OPTION_MULTI_SUBSPACE           301
 338 #define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
 339 '
 340
 341 PARSE_AND_LIST_LONGOPTS='
 342   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 343   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 344 '
 345
 346 PARSE_AND_LIST_OPTIONS='
 347   fprintf (file, _("\
 348   --multi-subspace      Generate import and export stubs to support\n\
 349                           multiple sub-space shared libraries\n"
 350                    ));
 351   fprintf (file, _("\
 352   --stub-group-size=N   Maximum size of a group of input sections that can be\n\
 353                           handled by one stub section.  A negative value\n\
 354                           locates all stubs before their branches (with a\n\
 355                           group size of -N), while a positive value allows\n\
 356                           two groups of input sections, one before, and one\n\
 357                           after each stub section.  Values of +/-1 indicate\n\
 358                           the linker should choose suitable defaults.\n"
 359                    ));
 360 '
 361
 362 PARSE_AND_LIST_ARGS_CASES='
 363     case OPTION_MULTI_SUBSPACE:
 364       multi_subspace = 1;
 365       break;
 366
 367     case OPTION_STUBGROUP_SIZE:
 368       {
 369         const char *end;
 370         group_size = bfd_scan_vma (optarg, &end, 0);
 371         if (*end)
 372           einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
 373       }
 374       break;
 375 '
 376
 377 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
 378 #
 379 LDEMUL_AFTER_PARSE=hppaelf_after_parse
 380 LDEMUL_FINISH=hppaelf_finish
 381 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements