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, 2007, 2008 Free Software Foundation, Inc.
   4 #
   5 # This file is part of the GNU Binutils.
   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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  20 # MA 02110-1301, USA.
  21 #
  22
  23 # This file is sourced from elf32.em, and defines extra hppa-elf
  24 # specific routines.
  25 #
  26 fragment <<EOF
  27
  28 #include "ldctor.h"
  29 #include "elf32-hppa.h"
  30
  31
  32 /* Fake input file for stubs.  */
  33 static lang_input_statement_type *stub_file;
  34
  35 /* Type of import/export stubs to build.  For a single sub-space model,
  36    we can build smaller import stubs and there is no need for export
  37    stubs.  */
  38 static int multi_subspace = 0;
  39
  40 /* Whether we need to call hppa_layout_sections_again.  */
  41 static int need_laying_out = 0;
  42
  43 /* Maximum size of a group of input sections that can be handled by
  44    one stub section.  A value of +/-1 indicates the bfd back-end
  45    should use a suitable default size.  */
  46 static bfd_signed_vma group_size = 1;
  47
  48 /* Stops the linker merging .text sections on a relocatable link,
  49    and adds millicode library to the list of input files.  */
  50
  51 static void
  52 hppaelf_after_parse (void)
  53 {
  54   if (link_info.relocatable)
  55     lang_add_unique (".text");
  56
  57   /* Enable this once we split millicode stuff from libgcc:
  58      lang_add_input_file ("milli",
  59                           lang_input_file_is_l_enum,
  60                           NULL);
  61   */
  62 }
  63
  64 /* This is called before the input files are opened.  We create a new
  65    fake input file to hold the stub sections.  */
  66
  67 static void
  68 hppaelf_create_output_section_statements (void)
  69 {
  70   if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
  71         && elf_object_id (link_info.output_bfd) == HPPA_ELF_TDATA))
  72     return;
  73
  74   stub_file = lang_add_input_file ("linker stubs",
  75                                    lang_input_file_is_fake_enum,
  76                                    NULL);
  77   stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
  78   if (stub_file->the_bfd == NULL
  79       || ! bfd_set_arch_mach (stub_file->the_bfd,
  80                               bfd_get_arch (link_info.output_bfd),
  81                               bfd_get_mach (link_info.output_bfd)))
  82     {
  83       einfo ("%X%P: can not create BFD %E\n");
  84       return;
  85     }
  86
  87   stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
  88   ldlang_add_file (stub_file);
  89 }
  90
  91
  92 struct hook_stub_info
  93 {
  94   lang_statement_list_type add;
  95   asection *input_section;
  96 };
  97
  98 /* Traverse the linker tree to find the spot where the stub goes.  */
  99
 100 static bfd_boolean
 101 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
 102 {
 103   lang_statement_union_type *l;
 104   bfd_boolean ret;
 105
 106   for (; (l = *lp) != NULL; lp = &l->header.next)
 107     {
 108       switch (l->header.type)
 109         {
 110         case lang_constructors_statement_enum:
 111           ret = hook_in_stub (info, &constructor_list.head);
 112           if (ret)
 113             return ret;
 114           break;
 115
 116         case lang_output_section_statement_enum:
 117           ret = hook_in_stub (info,
 118                               &l->output_section_statement.children.head);
 119           if (ret)
 120             return ret;
 121           break;
 122
 123         case lang_wild_statement_enum:
 124           ret = hook_in_stub (info, &l->wild_statement.children.head);
 125           if (ret)
 126             return ret;
 127           break;
 128
 129         case lang_group_statement_enum:
 130           ret = hook_in_stub (info, &l->group_statement.children.head);
 131           if (ret)
 132             return ret;
 133           break;
 134
 135         case lang_input_section_enum:
 136           if (l->input_section.section == info->input_section)
 137             {
 138               /* We've found our section.  Insert the stub immediately
 139                  before its associated input section.  */
 140               *lp = info->add.head;
 141               *(info->add.tail) = l;
 142               return TRUE;
 143             }
 144           break;
 145
 146         case lang_data_statement_enum:
 147         case lang_reloc_statement_enum:
 148         case lang_object_symbols_statement_enum:
 149         case lang_output_statement_enum:
 150         case lang_target_statement_enum:
 151         case lang_input_statement_enum:
 152         case lang_assignment_statement_enum:
 153         case lang_padding_statement_enum:
 154         case lang_address_statement_enum:
 155         case lang_fill_statement_enum:
 156           break;
 157
 158         default:
 159           FAIL ();
 160           break;
 161         }
 162     }
 163   return FALSE;
 164 }
 165
 166
 167 /* Call-back for elf32_hppa_size_stubs.  */
 168
 169 /* Create a new stub section, and arrange for it to be linked
 170    immediately before INPUT_SECTION.  */
 171
 172 static asection *
 173 hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
 174 {
 175   asection *stub_sec;
 176   flagword flags;
 177   asection *output_section;
 178   const char *secname;
 179   lang_output_section_statement_type *os;
 180   struct hook_stub_info info;
 181
 182   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 183            | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 184   stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
 185                                                  stub_sec_name, flags);
 186   if (stub_sec == NULL)
 187     goto err_ret;
 188
 189   output_section = input_section->output_section;
 190   secname = bfd_get_section_name (output_section->owner, output_section);
 191   os = lang_output_section_find (secname);
 192
 193   info.input_section = input_section;
 194   lang_list_init (&info.add);
 195   lang_add_section (&info.add, stub_sec, os);
 196
 197   if (info.add.head == NULL)
 198     goto err_ret;
 199
 200   if (hook_in_stub (&info, &os->children.head))
 201     return stub_sec;
 202
 203  err_ret:
 204   einfo ("%X%P: can not make stub section: %E\n");
 205   return NULL;
 206 }
 207
 208
 209 /* Another call-back for elf32_hppa_size_stubs.  */
 210
 211 static void
 212 hppaelf_layout_sections_again (void)
 213 {
 214   /* If we have changed sizes of the stub sections, then we need
 215      to recalculate all the section offsets.  This may mean we need to
 216      add even more stubs.  */
 217   gld${EMULATION_NAME}_map_segments (TRUE);
 218   need_laying_out = -1;
 219 }
 220
 221
 222 static void
 223 build_section_lists (lang_statement_union_type *statement)
 224 {
 225   if (statement->header.type == lang_input_section_enum)
 226     {
 227       asection *i = statement->input_section.section;
 228
 229       if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
 230           && (i->flags & SEC_EXCLUDE) == 0
 231           && i->output_section != NULL
 232           && i->output_section->owner == link_info.output_bfd)
 233         {
 234           elf32_hppa_next_input_section (&link_info, i);
 235         }
 236     }
 237 }
 238
 239
 240 /* Final emulation specific call.  For the PA we use this opportunity
 241    to build linker stubs.  */
 242
 243 static void
 244 gld${EMULATION_NAME}_finish (void)
 245 {
 246   /* bfd_elf_discard_info just plays with debugging sections,
 247      ie. doesn't affect any code, so we can delay resizing the
 248      sections.  It's likely we'll resize everything in the process of
 249      adding stubs.  */
 250   if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
 251     need_laying_out = 1;
 252
 253   /* If generating a relocatable output file, then we don't
 254      have to examine the relocs.  */
 255   if (stub_file != NULL && !link_info.relocatable)
 256     {
 257       int ret = elf32_hppa_setup_section_lists (link_info.output_bfd,
 258                                                 &link_info);
 259
 260       if (ret != 0)
 261         {
 262           if (ret < 0)
 263             {
 264               einfo ("%X%P: can not size stub section: %E\n");
 265               return;
 266             }
 267
 268           lang_for_each_statement (build_section_lists);
 269
 270           /* Call into the BFD backend to do the real work.  */
 271           if (! elf32_hppa_size_stubs (link_info.output_bfd,
 272                                        stub_file->the_bfd,
 273                                        &link_info,
 274                                        multi_subspace,
 275                                        group_size,
 276                                        &hppaelf_add_stub_section,
 277                                        &hppaelf_layout_sections_again))
 278             {
 279               einfo ("%X%P: can not size stub section: %E\n");
 280               return;
 281             }
 282         }
 283     }
 284
 285   if (need_laying_out != -1)
 286     gld${EMULATION_NAME}_map_segments (need_laying_out);
 287
 288   if (! link_info.relocatable)
 289     {
 290       /* Set the global data pointer.  */
 291       if (! elf32_hppa_set_gp (link_info.output_bfd, &link_info))
 292         {
 293           einfo ("%X%P: can not set gp\n");
 294           return;
 295         }
 296
 297       /* Now build the linker stubs.  */
 298       if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
 299         {
 300           if (! elf32_hppa_build_stubs (&link_info))
 301             einfo ("%X%P: can not build stubs: %E\n");
 302         }
 303     }
 304
 305   finish_default ();
 306 }
 307
 308
 309 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 310    check_needed routines.  */
 311
 312 static void (*real_func) (lang_input_statement_type *);
 313
 314 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
 315 {
 316   if (l != stub_file)
 317     (*real_func) (l);
 318 }
 319
 320 static void
 321 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
 322 {
 323   real_func = func;
 324   lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
 325 }
 326
 327 #define lang_for_each_input_file hppa_lang_for_each_input_file
 328
 329 EOF
 330
 331 # Define some shell vars to insert bits of code into the standard elf
 332 # parse_args and list_options functions.
 333 #
 334 PARSE_AND_LIST_PROLOGUE='
 335 #define OPTION_MULTI_SUBSPACE           301
 336 #define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
 337 '
 338
 339 PARSE_AND_LIST_LONGOPTS='
 340   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 341   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 342 '
 343
 344 PARSE_AND_LIST_OPTIONS='
 345   fprintf (file, _("\
 346   --multi-subspace            Generate import and export stubs to support\n\
 347                                 multiple sub-space shared libraries\n"
 348                    ));
 349   fprintf (file, _("\
 350   --stub-group-size=N         Maximum size of a group of input sections that\n\
 351                                 can be handled by one stub section.  A negative\n\
 352                                 value locates all stubs before their branches\n\
 353                                 (with a group size of -N), while a positive\n\
 354                                 value allows two groups of input sections, one\n\
 355                                 before, and one after each stub section.\n\
 356                                 Values of +/-1 indicate the linker should\n\
 357                                 choose suitable defaults.\n"
 358                    ));
 359 '
 360
 361 PARSE_AND_LIST_ARGS_CASES='
 362     case OPTION_MULTI_SUBSPACE:
 363       multi_subspace = 1;
 364       break;
 365
 366     case OPTION_STUBGROUP_SIZE:
 367       {
 368         const char *end;
 369         group_size = bfd_scan_vma (optarg, &end, 0);
 370         if (*end)
 371           einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
 372       }
 373       break;
 374 '
 375
 376 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
 377 #
 378 LDEMUL_AFTER_PARSE=hppaelf_after_parse
 379 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
 380 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements