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   extern const bfd_target bfd_elf32_hppa_linux_vec;
  71   extern const bfd_target bfd_elf32_hppa_nbsd_vec;
  72   extern const bfd_target bfd_elf32_hppa_vec;
  73
  74   if (link_info.output_bfd->xvec != &bfd_elf32_hppa_linux_vec
  75       && link_info.output_bfd->xvec != &bfd_elf32_hppa_nbsd_vec
  76       && link_info.output_bfd->xvec != &bfd_elf32_hppa_vec)
  77     return;
  78
  79   stub_file = lang_add_input_file ("linker stubs",
  80                                    lang_input_file_is_fake_enum,
  81                                    NULL);
  82   stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
  83   if (stub_file->the_bfd == NULL
  84       || ! bfd_set_arch_mach (stub_file->the_bfd,
  85                               bfd_get_arch (link_info.output_bfd),
  86                               bfd_get_mach (link_info.output_bfd)))
  87     {
  88       einfo ("%X%P: can not create BFD %E\n");
  89       return;
  90     }
  91
  92   stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
  93   ldlang_add_file (stub_file);
  94 }
  95
  96
  97 struct hook_stub_info
  98 {
  99   lang_statement_list_type add;
 100   asection *input_section;
 101 };
 102
 103 /* Traverse the linker tree to find the spot where the stub goes.  */
 104
 105 static bfd_boolean
 106 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
 107 {
 108   lang_statement_union_type *l;
 109   bfd_boolean ret;
 110
 111   for (; (l = *lp) != NULL; lp = &l->header.next)
 112     {
 113       switch (l->header.type)
 114         {
 115         case lang_constructors_statement_enum:
 116           ret = hook_in_stub (info, &constructor_list.head);
 117           if (ret)
 118             return ret;
 119           break;
 120
 121         case lang_output_section_statement_enum:
 122           ret = hook_in_stub (info,
 123                               &l->output_section_statement.children.head);
 124           if (ret)
 125             return ret;
 126           break;
 127
 128         case lang_wild_statement_enum:
 129           ret = hook_in_stub (info, &l->wild_statement.children.head);
 130           if (ret)
 131             return ret;
 132           break;
 133
 134         case lang_group_statement_enum:
 135           ret = hook_in_stub (info, &l->group_statement.children.head);
 136           if (ret)
 137             return ret;
 138           break;
 139
 140         case lang_input_section_enum:
 141           if (l->input_section.section == info->input_section)
 142             {
 143               /* We've found our section.  Insert the stub immediately
 144                  before its associated input section.  */
 145               *lp = info->add.head;
 146               *(info->add.tail) = l;
 147               return TRUE;
 148             }
 149           break;
 150
 151         case lang_data_statement_enum:
 152         case lang_reloc_statement_enum:
 153         case lang_object_symbols_statement_enum:
 154         case lang_output_statement_enum:
 155         case lang_target_statement_enum:
 156         case lang_input_statement_enum:
 157         case lang_assignment_statement_enum:
 158         case lang_padding_statement_enum:
 159         case lang_address_statement_enum:
 160         case lang_fill_statement_enum:
 161           break;
 162
 163         default:
 164           FAIL ();
 165           break;
 166         }
 167     }
 168   return FALSE;
 169 }
 170
 171
 172 /* Call-back for elf32_hppa_size_stubs.  */
 173
 174 /* Create a new stub section, and arrange for it to be linked
 175    immediately before INPUT_SECTION.  */
 176
 177 static asection *
 178 hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
 179 {
 180   asection *stub_sec;
 181   flagword flags;
 182   asection *output_section;
 183   const char *secname;
 184   lang_output_section_statement_type *os;
 185   struct hook_stub_info info;
 186
 187   stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
 188   if (stub_sec == NULL)
 189     goto err_ret;
 190
 191   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 192            | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 193   if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
 194     goto err_ret;
 195
 196   output_section = input_section->output_section;
 197   secname = bfd_get_section_name (output_section->owner, output_section);
 198   os = lang_output_section_find (secname);
 199
 200   info.input_section = input_section;
 201   lang_list_init (&info.add);
 202   lang_add_section (&info.add, stub_sec, os);
 203
 204   if (info.add.head == NULL)
 205     goto err_ret;
 206
 207   if (hook_in_stub (&info, &os->children.head))
 208     return stub_sec;
 209
 210  err_ret:
 211   einfo ("%X%P: can not make stub section: %E\n");
 212   return NULL;
 213 }
 214
 215
 216 /* Another call-back for elf32_hppa_size_stubs.  */
 217
 218 static void
 219 hppaelf_layout_sections_again (void)
 220 {
 221   /* If we have changed sizes of the stub sections, then we need
 222      to recalculate all the section offsets.  This may mean we need to
 223      add even more stubs.  */
 224   gld${EMULATION_NAME}_map_segments (TRUE);
 225   need_laying_out = -1;
 226 }
 227
 228
 229 static void
 230 build_section_lists (lang_statement_union_type *statement)
 231 {
 232   if (statement->header.type == lang_input_section_enum)
 233     {
 234       asection *i = statement->input_section.section;
 235
 236       if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
 237           && (i->flags & SEC_EXCLUDE) == 0
 238           && i->output_section != NULL
 239           && i->output_section->owner == link_info.output_bfd)
 240         {
 241           elf32_hppa_next_input_section (&link_info, i);
 242         }
 243     }
 244 }
 245
 246
 247 /* Final emulation specific call.  For the PA we use this opportunity
 248    to build linker stubs.  */
 249
 250 static void
 251 gld${EMULATION_NAME}_finish (void)
 252 {
 253   /* bfd_elf_discard_info just plays with debugging sections,
 254      ie. doesn't affect any code, so we can delay resizing the
 255      sections.  It's likely we'll resize everything in the process of
 256      adding stubs.  */
 257   if (bfd_elf_discard_info (link_info.output_bfd, &link_info))
 258     need_laying_out = 1;
 259
 260   /* If generating a relocatable output file, then we don't
 261      have to examine the relocs.  */
 262   if (stub_file != NULL && !link_info.relocatable)
 263     {
 264       int ret = elf32_hppa_setup_section_lists (link_info.output_bfd,
 265                                                 &link_info);
 266
 267       if (ret != 0)
 268         {
 269           if (ret < 0)
 270             {
 271               einfo ("%X%P: can not size stub section: %E\n");
 272               return;
 273             }
 274
 275           lang_for_each_statement (build_section_lists);
 276
 277           /* Call into the BFD backend to do the real work.  */
 278           if (! elf32_hppa_size_stubs (link_info.output_bfd,
 279                                        stub_file->the_bfd,
 280                                        &link_info,
 281                                        multi_subspace,
 282                                        group_size,
 283                                        &hppaelf_add_stub_section,
 284                                        &hppaelf_layout_sections_again))
 285             {
 286               einfo ("%X%P: can not size stub section: %E\n");
 287               return;
 288             }
 289         }
 290     }
 291
 292   if (need_laying_out != -1)
 293     gld${EMULATION_NAME}_map_segments (need_laying_out);
 294
 295   if (! link_info.relocatable)
 296     {
 297       /* Set the global data pointer.  */
 298       if (! elf32_hppa_set_gp (link_info.output_bfd, &link_info))
 299         {
 300           einfo ("%X%P: can not set gp\n");
 301           return;
 302         }
 303
 304       /* Now build the linker stubs.  */
 305       if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
 306         {
 307           if (! elf32_hppa_build_stubs (&link_info))
 308             einfo ("%X%P: can not build stubs: %E\n");
 309         }
 310     }
 311
 312   finish_default ();
 313 }
 314
 315
 316 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 317    check_needed routines.  */
 318
 319 static void (*real_func) (lang_input_statement_type *);
 320
 321 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
 322 {
 323   if (l != stub_file)
 324     (*real_func) (l);
 325 }
 326
 327 static void
 328 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
 329 {
 330   real_func = func;
 331   lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
 332 }
 333
 334 #define lang_for_each_input_file hppa_lang_for_each_input_file
 335
 336 EOF
 337
 338 # Define some shell vars to insert bits of code into the standard elf
 339 # parse_args and list_options functions.
 340 #
 341 PARSE_AND_LIST_PROLOGUE='
 342 #define OPTION_MULTI_SUBSPACE           301
 343 #define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
 344 '
 345
 346 PARSE_AND_LIST_LONGOPTS='
 347   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 348   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 349 '
 350
 351 PARSE_AND_LIST_OPTIONS='
 352   fprintf (file, _("\
 353   --multi-subspace            Generate import and export stubs to support\n\
 354                                 multiple sub-space shared libraries\n"
 355                    ));
 356   fprintf (file, _("\
 357   --stub-group-size=N         Maximum size of a group of input sections that\n\
 358                                 can be handled by one stub section.  A negative\n\
 359                                 value locates all stubs before their branches\n\
 360                                 (with a group size of -N), while a positive\n\
 361                                 value allows two groups of input sections, one\n\
 362                                 before, and one after each stub section.\n\
 363                                 Values of +/-1 indicate the linker should\n\
 364                                 choose suitable defaults.\n"
 365                    ));
 366 '
 367
 368 PARSE_AND_LIST_ARGS_CASES='
 369     case OPTION_MULTI_SUBSPACE:
 370       multi_subspace = 1;
 371       break;
 372
 373     case OPTION_STUBGROUP_SIZE:
 374       {
 375         const char *end;
 376         group_size = bfd_scan_vma (optarg, &end, 0);
 377         if (*end)
 378           einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
 379       }
 380       break;
 381 '
 382
 383 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
 384 #
 385 LDEMUL_AFTER_PARSE=hppaelf_after_parse
 386 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
 387 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements