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   stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
 183   if (stub_sec == NULL)
 184     goto err_ret;
 185
 186   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 187            | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 188   if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
 189     goto err_ret;
 190
 191   output_section = input_section->output_section;
 192   secname = bfd_get_section_name (output_section->owner, output_section);
 193   os = lang_output_section_find (secname);
 194
 195   info.input_section = input_section;
 196   lang_list_init (&info.add);
 197   lang_add_section (&info.add, stub_sec, os);
 198
 199   if (info.add.head == NULL)
 200     goto err_ret;
 201
 202   if (hook_in_stub (&info, &os->children.head))
 203     return stub_sec;
 204
 205  err_ret:
 206   einfo ("%X%P: can not make stub section: %E\n");
 207   return NULL;
 208 }
 209
 210
 211 /* Another call-back for elf32_hppa_size_stubs.  */
 212
 213 static void
 214 hppaelf_layout_sections_again (void)
 215 {
 216   /* If we have changed sizes of the stub sections, then we need
 217      to recalculate all the section offsets.  This may mean we need to
 218      add even more stubs.  */
 219   gld${EMULATION_NAME}_map_segments (TRUE);
 220   need_laying_out = -1;
 221 }
 222
 223
 224 static void
 225 build_section_lists (lang_statement_union_type *statement)
 226 {
 227   if (statement->header.type == lang_input_section_enum)
 228     {
 229       asection *i = statement->input_section.section;
 230
 231       if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
 232           && (i->flags & SEC_EXCLUDE) == 0
 233           && i->output_section != NULL
 234           && i->output_section->owner == link_info.output_bfd)
 235         {
 236           elf32_hppa_next_input_section (&link_info, i);
 237         }
 238     }
 239 }
 240
 241
 242 /* Final emulation specific call.  For the PA we use this opportunity
 243    to build linker stubs.  */
 244
 245 static void
 246 gld${EMULATION_NAME}_finish (void)
 247 {
 248   /* bfd_elf_discard_info just plays with debugging sections,
 249      ie. doesn't affect any code, so we can delay resizing the
 250      sections.  It's likely we'll resize everything in the process of
 251      adding stubs.  */
 252   if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
 253     need_laying_out = 1;
 254
 255   /* If generating a relocatable output file, then we don't
 256      have to examine the relocs.  */
 257   if (stub_file != NULL && !link_info.relocatable)
 258     {
 259       int ret = elf32_hppa_setup_section_lists (link_info.output_bfd,
 260                                                 &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 (link_info.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 (need_laying_out != -1)
 288     gld${EMULATION_NAME}_map_segments (need_laying_out);
 289
 290   if (! link_info.relocatable)
 291     {
 292       /* Set the global data pointer.  */
 293       if (! elf32_hppa_set_gp (link_info.output_bfd, &link_info))
 294         {
 295           einfo ("%X%P: can not set gp\n");
 296           return;
 297         }
 298
 299       /* Now build the linker stubs.  */
 300       if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
 301         {
 302           if (! elf32_hppa_build_stubs (&link_info))
 303             einfo ("%X%P: can not build stubs: %E\n");
 304         }
 305     }
 306
 307   finish_default ();
 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\n\
 353                                 can be handled by one stub section.  A negative\n\
 354                                 value locates all stubs before their branches\n\
 355                                 (with a group size of -N), while a positive\n\
 356                                 value allows two groups of input sections, one\n\
 357                                 before, and one after each stub section.\n\
 358                                 Values of +/-1 indicate the linker should\n\
 359                                 choose suitable defaults.\n"
 360                    ));
 361 '
 362
 363 PARSE_AND_LIST_ARGS_CASES='
 364     case OPTION_MULTI_SUBSPACE:
 365       multi_subspace = 1;
 366       break;
 367
 368     case OPTION_STUBGROUP_SIZE:
 369       {
 370         const char *end;
 371         group_size = bfd_scan_vma (optarg, &end, 0);
 372         if (*end)
 373           einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
 374       }
 375       break;
 376 '
 377
 378 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
 379 #
 380 LDEMUL_AFTER_PARSE=hppaelf_after_parse
 381 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
 382 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements