ld/emultempl/hppaelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003
   3 #   Free Software Foundation, Inc.
   4 #
   5 # This file is part of GLD, the Gnu Linker.
   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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20 #
  21
  22 # This file is sourced from elf32.em, and defines extra hppa-elf
  23 # specific routines.
  24 #
  25 cat >>e${EMULATION_NAME}.c <<EOF
  26
  27 #include "ldctor.h"
  28 #include "elf32-hppa.h"
  29
  30
  31 /* Fake input file for stubs.  */
  32 static lang_input_statement_type *stub_file;
  33
  34 /* Type of import/export stubs to build.  For a single sub-space model,
  35    we can build smaller import stubs and there is no need for export
  36    stubs.  */
  37 static int multi_subspace = 0;
  38
  39 /* Whether we need to call hppa_layout_sections_again.  */
  40 static int need_laying_out = 0;
  41
  42 /* Maximum size of a group of input sections that can be handled by
  43    one stub section.  A value of +/-1 indicates the bfd back-end
  44    should use a suitable default size.  */
  45 static bfd_signed_vma group_size = 1;
  46
  47 /* Stops the linker merging .text sections on a relocatable link,
  48    and adds millicode library to the list of input files.  */
  49
  50 static void
  51 hppaelf_after_parse (void)
  52 {
  53   if (link_info.relocatable)
  54     lang_add_unique (".text");
  55
  56   /* Enable this once we split millicode stuff from libgcc:
  57      lang_add_input_file ("milli",
  58                           lang_input_file_is_l_enum,
  59                           NULL);
  60   */
  61 }
  62
  63 /* This is called before the input files are opened.  We create a new
  64    fake input file to hold the stub sections.  */
  65
  66 static void
  67 hppaelf_create_output_section_statements (void)
  68 {
  69   extern const bfd_target bfd_elf32_hppa_linux_vec;
  70   extern const bfd_target bfd_elf32_hppa_nbsd_vec;
  71   extern const bfd_target bfd_elf32_hppa_vec;
  72
  73   if (link_info.hash->creator != &bfd_elf32_hppa_linux_vec
  74       && link_info.hash->creator != &bfd_elf32_hppa_nbsd_vec
  75       && link_info.hash->creator != &bfd_elf32_hppa_vec)
  76     return;
  77
  78   stub_file = lang_add_input_file ("linker stubs",
  79                                    lang_input_file_is_fake_enum,
  80                                    NULL);
  81   stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
  82   if (stub_file->the_bfd == NULL
  83       || ! bfd_set_arch_mach (stub_file->the_bfd,
  84                               bfd_get_arch (output_bfd),
  85                               bfd_get_mach (output_bfd)))
  86     {
  87       einfo ("%X%P: can not create BFD %E\n");
  88       return;
  89     }
  90
  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   stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
 186   if (stub_sec == NULL)
 187     goto err_ret;
 188
 189   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 190            | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 191   if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
 192     goto err_ret;
 193
 194   output_section = input_section->output_section;
 195   secname = bfd_get_section_name (output_section->owner, output_section);
 196   os = lang_output_section_find (secname);
 197
 198   info.input_section = input_section;
 199   lang_list_init (&info.add);
 200   lang_add_section (&info.add, stub_sec, os, stub_file);
 201
 202   if (info.add.head == NULL)
 203     goto err_ret;
 204
 205   if (hook_in_stub (&info, &os->children.head))
 206     return stub_sec;
 207
 208  err_ret:
 209   einfo ("%X%P: can not make stub section: %E\n");
 210   return NULL;
 211 }
 212
 213
 214 /* Another call-back for elf32_hppa_size_stubs.  */
 215
 216 static void
 217 hppaelf_layout_sections_again (void)
 218 {
 219   /* If we have changed sizes of the stub sections, then we need
 220      to recalculate all the section offsets.  This may mean we need to
 221      add even more stubs.  */
 222   need_laying_out = 0;
 223
 224   lang_reset_memory_regions ();
 225
 226   /* Resize the sections.  */
 227   lang_size_sections (stat_ptr->head, abs_output_section,
 228                       &stat_ptr->head, 0, (bfd_vma) 0, NULL, TRUE);
 229
 230   /* Redo special stuff.  */
 231   ldemul_after_allocation ();
 232
 233   /* Do the assignments again.  */
 234   lang_do_assignments (stat_ptr->head, abs_output_section,
 235                        (fill_type *) 0, (bfd_vma) 0);
 236 }
 237
 238
 239 static void
 240 build_section_lists (lang_statement_union_type *statement)
 241 {
 242   if (statement->header.type == lang_input_section_enum
 243       && !statement->input_section.ifile->just_syms_flag
 244       && (statement->input_section.section->flags & SEC_EXCLUDE) == 0
 245       && statement->input_section.section->output_section != NULL
 246       && statement->input_section.section->output_section->owner == output_bfd)
 247     {
 248       elf32_hppa_next_input_section (&link_info,
 249                                      statement->input_section.section);
 250     }
 251 }
 252
 253
 254 /* Final emulation specific call.  For the PA we use this opportunity
 255    to build linker stubs.  */
 256
 257 static void
 258 gld${EMULATION_NAME}_finish (void)
 259 {
 260   /* bfd_elf_discard_info just plays with debugging sections,
 261      ie. doesn't affect any code, so we can delay resizing the
 262      sections.  It's likely we'll resize everything in the process of
 263      adding stubs.  */
 264   if (bfd_elf_discard_info (output_bfd, &link_info))
 265     need_laying_out = 1;
 266
 267   /* If generating a relocatable output file, then we don't
 268      have to examine the relocs.  */
 269   if (stub_file != NULL && !link_info.relocatable)
 270     {
 271       int ret = elf32_hppa_setup_section_lists (output_bfd, &link_info);
 272
 273       if (ret != 0)
 274         {
 275           if (ret < 0)
 276             {
 277               einfo ("%X%P: can not size stub section: %E\n");
 278               return;
 279             }
 280
 281           lang_for_each_statement (build_section_lists);
 282
 283           /* Call into the BFD backend to do the real work.  */
 284           if (! elf32_hppa_size_stubs (output_bfd,
 285                                        stub_file->the_bfd,
 286                                        &link_info,
 287                                        multi_subspace,
 288                                        group_size,
 289                                        &hppaelf_add_stub_section,
 290                                        &hppaelf_layout_sections_again))
 291             {
 292               einfo ("%X%P: can not size stub section: %E\n");
 293               return;
 294             }
 295         }
 296     }
 297
 298   if (need_laying_out)
 299     hppaelf_layout_sections_again ();
 300
 301   if (! link_info.relocatable)
 302     {
 303       /* Set the global data pointer.  */
 304       if (! elf32_hppa_set_gp (output_bfd, &link_info))
 305         {
 306           einfo ("%X%P: can not set gp\n");
 307           return;
 308         }
 309
 310       /* Now build the linker stubs.  */
 311       if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
 312         {
 313           if (! elf32_hppa_build_stubs (&link_info))
 314             einfo ("%X%P: can not build stubs: %E\n");
 315         }
 316     }
 317 }
 318
 319
 320 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 321    check_needed routines.  */
 322
 323 static void (*real_func) (lang_input_statement_type *);
 324
 325 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
 326 {
 327   if (l != stub_file)
 328     (*real_func) (l);
 329 }
 330
 331 static void
 332 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
 333 {
 334   real_func = func;
 335   lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
 336 }
 337
 338 #define lang_for_each_input_file hppa_lang_for_each_input_file
 339
 340 EOF
 341
 342 # Define some shell vars to insert bits of code into the standard elf
 343 # parse_args and list_options functions.
 344 #
 345 PARSE_AND_LIST_PROLOGUE='
 346 #define OPTION_MULTI_SUBSPACE           301
 347 #define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
 348 '
 349
 350 PARSE_AND_LIST_LONGOPTS='
 351   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 352   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 353 '
 354
 355 PARSE_AND_LIST_OPTIONS='
 356   fprintf (file, _("\
 357   --multi-subspace      Generate import and export stubs to support\n\
 358                           multiple sub-space shared libraries\n"
 359                    ));
 360   fprintf (file, _("\
 361   --stub-group-size=N   Maximum size of a group of input sections that can be\n\
 362                           handled by one stub section.  A negative value\n\
 363                           locates all stubs before their branches (with a\n\
 364                           group size of -N), while a positive value allows\n\
 365                           two groups of input sections, one before, and one\n\
 366                           after each stub section.  Values of +/-1 indicate\n\
 367                           the linker should choose suitable defaults.\n"
 368                    ));
 369 '
 370
 371 PARSE_AND_LIST_ARGS_CASES='
 372     case OPTION_MULTI_SUBSPACE:
 373       multi_subspace = 1;
 374       break;
 375
 376     case OPTION_STUBGROUP_SIZE:
 377       {
 378         const char *end;
 379         group_size = bfd_scan_vma (optarg, &end, 0);
 380         if (*end)
 381           einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
 382       }
 383       break;
 384 '
 385
 386 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
 387 #
 388 LDEMUL_AFTER_PARSE=hppaelf_after_parse
 389 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
 390 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements