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, 2012 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) == HPPA32_ELF_DATA
  74             || elf_object_id (link_info.output_bfd) == HPPA64_ELF_DATA)))
  75     return;
  76
  77   stub_file = lang_add_input_file ("linker stubs",
  78                                    lang_input_file_is_fake_enum,
  79                                    NULL);
  80   stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
  81   if (stub_file->the_bfd == NULL
  82       || ! bfd_set_arch_mach (stub_file->the_bfd,
  83                               bfd_get_arch (link_info.output_bfd),
  84                               bfd_get_mach (link_info.output_bfd)))
  85     {
  86       einfo ("%X%P: can not create BFD %E\n");
  87       return;
  88     }
  89
  90   stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
  91   ldlang_add_file (stub_file);
  92 }
  93
  94
  95 struct hook_stub_info
  96 {
  97   lang_statement_list_type add;
  98   asection *input_section;
  99 };
 100
 101 /* Traverse the linker tree to find the spot where the stub goes.  */
 102
 103 static bfd_boolean
 104 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
 105 {
 106   lang_statement_union_type *l;
 107   bfd_boolean ret;
 108
 109   for (; (l = *lp) != NULL; lp = &l->header.next)
 110     {
 111       switch (l->header.type)
 112         {
 113         case lang_constructors_statement_enum:
 114           ret = hook_in_stub (info, &constructor_list.head);
 115           if (ret)
 116             return ret;
 117           break;
 118
 119         case lang_output_section_statement_enum:
 120           ret = hook_in_stub (info,
 121                               &l->output_section_statement.children.head);
 122           if (ret)
 123             return ret;
 124           break;
 125
 126         case lang_wild_statement_enum:
 127           ret = hook_in_stub (info, &l->wild_statement.children.head);
 128           if (ret)
 129             return ret;
 130           break;
 131
 132         case lang_group_statement_enum:
 133           ret = hook_in_stub (info, &l->group_statement.children.head);
 134           if (ret)
 135             return ret;
 136           break;
 137
 138         case lang_input_section_enum:
 139           if (l->input_section.section == info->input_section)
 140             {
 141               /* We've found our section.  Insert the stub immediately
 142                  before its associated input section.  */
 143               *lp = info->add.head;
 144               *(info->add.tail) = l;
 145               return TRUE;
 146             }
 147           break;
 148
 149         case lang_data_statement_enum:
 150         case lang_reloc_statement_enum:
 151         case lang_object_symbols_statement_enum:
 152         case lang_output_statement_enum:
 153         case lang_target_statement_enum:
 154         case lang_input_statement_enum:
 155         case lang_assignment_statement_enum:
 156         case lang_padding_statement_enum:
 157         case lang_address_statement_enum:
 158         case lang_fill_statement_enum:
 159           break;
 160
 161         default:
 162           FAIL ();
 163           break;
 164         }
 165     }
 166   return FALSE;
 167 }
 168
 169
 170 /* Call-back for elf32_hppa_size_stubs.  */
 171
 172 /* Create a new stub section, and arrange for it to be linked
 173    immediately before INPUT_SECTION.  */
 174
 175 static asection *
 176 hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
 177 {
 178   asection *stub_sec;
 179   flagword flags;
 180   asection *output_section;
 181   const char *secname;
 182   lang_output_section_statement_type *os;
 183   struct hook_stub_info info;
 184
 185   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 186            | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 187   stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
 188                                                  stub_sec_name, flags);
 189   if (stub_sec == NULL)
 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);
 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   gld${EMULATION_NAME}_map_segments (TRUE);
 221   need_laying_out = -1;
 222 }
 223
 224
 225 static void
 226 build_section_lists (lang_statement_union_type *statement)
 227 {
 228   if (statement->header.type == lang_input_section_enum)
 229     {
 230       asection *i = statement->input_section.section;
 231
 232       if (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
 233           && (i->flags & SEC_EXCLUDE) == 0
 234           && i->output_section != NULL
 235           && i->output_section->owner == link_info.output_bfd)
 236         {
 237           elf32_hppa_next_input_section (&link_info, i);
 238         }
 239     }
 240 }
 241
 242
 243 /* For the PA we use this opportunity to size and build linker stubs.  */
 244
 245 static void
 246 gld${EMULATION_NAME}_after_allocation (void)
 247 {
 248   /* bfd_elf_discard_info just plays with data and debugging sections,
 249      ie. doesn't affect code size, 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
 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_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
 380 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements