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, 2006, 2007, 2008, 2009 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   after_parse_default ();
  64 }
  65
  66 /* This is called before the input files are opened.  We create a new
  67    fake input file to hold the stub sections.  */
  68
  69 static void
  70 hppaelf_create_output_section_statements (void)
  71 {
  72   if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
  73         && elf_object_id (link_info.output_bfd) == HPPA_ELF_TDATA))
  74     return;
  75
  76   stub_file = lang_add_input_file ("linker stubs",
  77                                    lang_input_file_is_fake_enum,
  78                                    NULL);
  79   stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
  80   if (stub_file->the_bfd == NULL
  81       || ! bfd_set_arch_mach (stub_file->the_bfd,
  82                               bfd_get_arch (link_info.output_bfd),
  83                               bfd_get_mach (link_info.output_bfd)))
  84     {
  85       einfo ("%X%P: can not create BFD %E\n");
  86       return;
  87     }
  88
  89   stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
  90   ldlang_add_file (stub_file);
  91 }
  92
  93
  94 struct hook_stub_info
  95 {
  96   lang_statement_list_type add;
  97   asection *input_section;
  98 };
  99
 100 /* Traverse the linker tree to find the spot where the stub goes.  */
 101
 102 static bfd_boolean
 103 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
 104 {
 105   lang_statement_union_type *l;
 106   bfd_boolean ret;
 107
 108   for (; (l = *lp) != NULL; lp = &l->header.next)
 109     {
 110       switch (l->header.type)
 111         {
 112         case lang_constructors_statement_enum:
 113           ret = hook_in_stub (info, &constructor_list.head);
 114           if (ret)
 115             return ret;
 116           break;
 117
 118         case lang_output_section_statement_enum:
 119           ret = hook_in_stub (info,
 120                               &l->output_section_statement.children.head);
 121           if (ret)
 122             return ret;
 123           break;
 124
 125         case lang_wild_statement_enum:
 126           ret = hook_in_stub (info, &l->wild_statement.children.head);
 127           if (ret)
 128             return ret;
 129           break;
 130
 131         case lang_group_statement_enum:
 132           ret = hook_in_stub (info, &l->group_statement.children.head);
 133           if (ret)
 134             return ret;
 135           break;
 136
 137         case lang_input_section_enum:
 138           if (l->input_section.section == info->input_section)
 139             {
 140               /* We've found our section.  Insert the stub immediately
 141                  before its associated input section.  */
 142               *lp = info->add.head;
 143               *(info->add.tail) = l;
 144               return TRUE;
 145             }
 146           break;
 147
 148         case lang_data_statement_enum:
 149         case lang_reloc_statement_enum:
 150         case lang_object_symbols_statement_enum:
 151         case lang_output_statement_enum:
 152         case lang_target_statement_enum:
 153         case lang_input_statement_enum:
 154         case lang_assignment_statement_enum:
 155         case lang_padding_statement_enum:
 156         case lang_address_statement_enum:
 157         case lang_fill_statement_enum:
 158           break;
 159
 160         default:
 161           FAIL ();
 162           break;
 163         }
 164     }
 165   return FALSE;
 166 }
 167
 168
 169 /* Call-back for elf32_hppa_size_stubs.  */
 170
 171 /* Create a new stub section, and arrange for it to be linked
 172    immediately before INPUT_SECTION.  */
 173
 174 static asection *
 175 hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
 176 {
 177   asection *stub_sec;
 178   flagword flags;
 179   asection *output_section;
 180   const char *secname;
 181   lang_output_section_statement_type *os;
 182   struct hook_stub_info info;
 183
 184   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 185            | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 186   stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
 187                                                  stub_sec_name, flags);
 188   if (stub_sec == NULL)
 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${EMULATION_NAME}_map_segments (TRUE);
 220   need_laying_out = -1;
 221 }
 222
 223
 224 static void
 225 build_section_lists (lang_statement_union_type *statement)
 226 {
 227   if (statement->header.type == lang_input_section_enum)
 228     {
 229       asection *i = statement->input_section.section;
 230
 231       if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
 232           && (i->flags & SEC_EXCLUDE) == 0
 233           && i->output_section != NULL
 234           && i->output_section->owner == link_info.output_bfd)
 235         {
 236           elf32_hppa_next_input_section (&link_info, i);
 237         }
 238     }
 239 }
 240
 241
 242 /* For the PA we use this opportunity to size and build linker stubs.  */
 243
 244 static void
 245 gld${EMULATION_NAME}_after_allocation (void)
 246 {
 247   /* bfd_elf_discard_info just plays with data and debugging sections,
 248      ie. doesn't affect code size, so we can delay resizing the
 249      sections.  It's likely we'll resize everything in the process of
 250      adding stubs.  */
 251   if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
 252     need_laying_out = 1;
 253
 254   /* If generating a relocatable output file, then we don't
 255      have to examine the relocs.  */
 256   if (stub_file != NULL && !link_info.relocatable)
 257     {
 258       int ret = elf32_hppa_setup_section_lists (link_info.output_bfd,
 259                                                 &link_info);
 260
 261       if (ret != 0)
 262         {
 263           if (ret < 0)
 264             {
 265               einfo ("%X%P: can not size stub section: %E\n");
 266               return;
 267             }
 268
 269           lang_for_each_statement (build_section_lists);
 270
 271           /* Call into the BFD backend to do the real work.  */
 272           if (! elf32_hppa_size_stubs (link_info.output_bfd,
 273                                        stub_file->the_bfd,
 274                                        &link_info,
 275                                        multi_subspace,
 276                                        group_size,
 277                                        &hppaelf_add_stub_section,
 278                                        &hppaelf_layout_sections_again))
 279             {
 280               einfo ("%X%P: can not size stub section: %E\n");
 281               return;
 282             }
 283         }
 284     }
 285
 286   if (need_laying_out != -1)
 287     gld${EMULATION_NAME}_map_segments (need_laying_out);
 288
 289   if (! link_info.relocatable)
 290     {
 291       /* Set the global data pointer.  */
 292       if (! elf32_hppa_set_gp (link_info.output_bfd, &link_info))
 293         {
 294           einfo ("%X%P: can not set gp\n");
 295           return;
 296         }
 297
 298       /* Now build the linker stubs.  */
 299       if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
 300         {
 301           if (! elf32_hppa_build_stubs (&link_info))
 302             einfo ("%X%P: can not build stubs: %E\n");
 303         }
 304     }
 305 }
 306
 307
 308 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 309    check_needed routines.  */
 310
 311 static void (*real_func) (lang_input_statement_type *);
 312
 313 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
 314 {
 315   if (l != stub_file)
 316     (*real_func) (l);
 317 }
 318
 319 static void
 320 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
 321 {
 322   real_func = func;
 323   lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
 324 }
 325
 326 #define lang_for_each_input_file hppa_lang_for_each_input_file
 327
 328 EOF
 329
 330 # Define some shell vars to insert bits of code into the standard elf
 331 # parse_args and list_options functions.
 332 #
 333 PARSE_AND_LIST_PROLOGUE='
 334 #define OPTION_MULTI_SUBSPACE           301
 335 #define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
 336 '
 337
 338 PARSE_AND_LIST_LONGOPTS='
 339   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 340   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 341 '
 342
 343 PARSE_AND_LIST_OPTIONS='
 344   fprintf (file, _("\
 345   --multi-subspace            Generate import and export stubs to support\n\
 346                                 multiple sub-space shared libraries\n"
 347                    ));
 348   fprintf (file, _("\
 349   --stub-group-size=N         Maximum size of a group of input sections that\n\
 350                                 can be handled by one stub section.  A negative\n\
 351                                 value locates all stubs before their branches\n\
 352                                 (with a group size of -N), while a positive\n\
 353                                 value allows two groups of input sections, one\n\
 354                                 before, and one after each stub section.\n\
 355                                 Values of +/-1 indicate the linker should\n\
 356                                 choose suitable defaults.\n"
 357                    ));
 358 '
 359
 360 PARSE_AND_LIST_ARGS_CASES='
 361     case OPTION_MULTI_SUBSPACE:
 362       multi_subspace = 1;
 363       break;
 364
 365     case OPTION_STUBGROUP_SIZE:
 366       {
 367         const char *end;
 368         group_size = bfd_scan_vma (optarg, &end, 0);
 369         if (*end)
 370           einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
 371       }
 372       break;
 373 '
 374
 375 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
 376 #
 377 LDEMUL_AFTER_PARSE=hppaelf_after_parse
 378 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
 379 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements