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 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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   stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
  92   ldlang_add_file (stub_file);
  93 }
  94
  95
  96 struct hook_stub_info
  97 {
  98   lang_statement_list_type add;
  99   asection *input_section;
 100 };
 101
 102 /* Traverse the linker tree to find the spot where the stub goes.  */
 103
 104 static bfd_boolean
 105 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
 106 {
 107   lang_statement_union_type *l;
 108   bfd_boolean ret;
 109
 110   for (; (l = *lp) != NULL; lp = &l->header.next)
 111     {
 112       switch (l->header.type)
 113         {
 114         case lang_constructors_statement_enum:
 115           ret = hook_in_stub (info, &constructor_list.head);
 116           if (ret)
 117             return ret;
 118           break;
 119
 120         case lang_output_section_statement_enum:
 121           ret = hook_in_stub (info,
 122                               &l->output_section_statement.children.head);
 123           if (ret)
 124             return ret;
 125           break;
 126
 127         case lang_wild_statement_enum:
 128           ret = hook_in_stub (info, &l->wild_statement.children.head);
 129           if (ret)
 130             return ret;
 131           break;
 132
 133         case lang_group_statement_enum:
 134           ret = hook_in_stub (info, &l->group_statement.children.head);
 135           if (ret)
 136             return ret;
 137           break;
 138
 139         case lang_input_section_enum:
 140           if (l->input_section.section == info->input_section)
 141             {
 142               /* We've found our section.  Insert the stub immediately
 143                  before its associated input section.  */
 144               *lp = info->add.head;
 145               *(info->add.tail) = l;
 146               return TRUE;
 147             }
 148           break;
 149
 150         case lang_data_statement_enum:
 151         case lang_reloc_statement_enum:
 152         case lang_object_symbols_statement_enum:
 153         case lang_output_statement_enum:
 154         case lang_target_statement_enum:
 155         case lang_input_statement_enum:
 156         case lang_assignment_statement_enum:
 157         case lang_padding_statement_enum:
 158         case lang_address_statement_enum:
 159         case lang_fill_statement_enum:
 160           break;
 161
 162         default:
 163           FAIL ();
 164           break;
 165         }
 166     }
 167   return FALSE;
 168 }
 169
 170
 171 /* Call-back for elf32_hppa_size_stubs.  */
 172
 173 /* Create a new stub section, and arrange for it to be linked
 174    immediately before INPUT_SECTION.  */
 175
 176 static asection *
 177 hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
 178 {
 179   asection *stub_sec;
 180   flagword flags;
 181   asection *output_section;
 182   const char *secname;
 183   lang_output_section_statement_type *os;
 184   struct hook_stub_info info;
 185
 186   stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
 187   if (stub_sec == NULL)
 188     goto err_ret;
 189
 190   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 191            | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 192   if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
 193     goto err_ret;
 194
 195   output_section = input_section->output_section;
 196   secname = bfd_get_section_name (output_section->owner, output_section);
 197   os = lang_output_section_find (secname);
 198
 199   info.input_section = input_section;
 200   lang_list_init (&info.add);
 201   lang_add_section (&info.add, stub_sec, os);
 202
 203   if (info.add.head == NULL)
 204     goto err_ret;
 205
 206   if (hook_in_stub (&info, &os->children.head))
 207     return stub_sec;
 208
 209  err_ret:
 210   einfo ("%X%P: can not make stub section: %E\n");
 211   return NULL;
 212 }
 213
 214
 215 /* Another call-back for elf32_hppa_size_stubs.  */
 216
 217 static void
 218 hppaelf_layout_sections_again (void)
 219 {
 220   /* If we have changed sizes of the stub sections, then we need
 221      to recalculate all the section offsets.  This may mean we need to
 222      add even more stubs.  */
 223   need_laying_out = 0;
 224
 225   gld${EMULATION_NAME}_layout_sections_again ();
 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 == 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 hppaelf_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 (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 (output_bfd, &link_info);
 265
 266       if (ret != 0)
 267         {
 268           if (ret < 0)
 269             {
 270               einfo ("%X%P: can not size stub section: %E\n");
 271               return;
 272             }
 273
 274           lang_for_each_statement (build_section_lists);
 275
 276           /* Call into the BFD backend to do the real work.  */
 277           if (! elf32_hppa_size_stubs (output_bfd,
 278                                        stub_file->the_bfd,
 279                                        &link_info,
 280                                        multi_subspace,
 281                                        group_size,
 282                                        &hppaelf_add_stub_section,
 283                                        &hppaelf_layout_sections_again))
 284             {
 285               einfo ("%X%P: can not size stub section: %E\n");
 286               return;
 287             }
 288         }
 289     }
 290
 291   if (need_laying_out)
 292     hppaelf_layout_sections_again ();
 293
 294   if (! link_info.relocatable)
 295     {
 296       /* Set the global data pointer.  */
 297       if (! elf32_hppa_set_gp (output_bfd, &link_info))
 298         {
 299           einfo ("%X%P: can not set gp\n");
 300           return;
 301         }
 302
 303       /* Now build the linker stubs.  */
 304       if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
 305         {
 306           if (! elf32_hppa_build_stubs (&link_info))
 307             einfo ("%X%P: can not build stubs: %E\n");
 308         }
 309     }
 310
 311   finish_default ();
 312 }
 313
 314
 315 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 316    check_needed routines.  */
 317
 318 static void (*real_func) (lang_input_statement_type *);
 319
 320 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
 321 {
 322   if (l != stub_file)
 323     (*real_func) (l);
 324 }
 325
 326 static void
 327 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
 328 {
 329   real_func = func;
 330   lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
 331 }
 332
 333 #define lang_for_each_input_file hppa_lang_for_each_input_file
 334
 335 EOF
 336
 337 # Define some shell vars to insert bits of code into the standard elf
 338 # parse_args and list_options functions.
 339 #
 340 PARSE_AND_LIST_PROLOGUE='
 341 #define OPTION_MULTI_SUBSPACE           301
 342 #define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
 343 '
 344
 345 PARSE_AND_LIST_LONGOPTS='
 346   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 347   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 348 '
 349
 350 PARSE_AND_LIST_OPTIONS='
 351   fprintf (file, _("\
 352   --multi-subspace      Generate import and export stubs to support\n\
 353                           multiple sub-space shared libraries\n"
 354                    ));
 355   fprintf (file, _("\
 356   --stub-group-size=N   Maximum size of a group of input sections that can be\n\
 357                           handled by one stub section.  A negative value\n\
 358                           locates all stubs before their branches (with a\n\
 359                           group size of -N), while a positive value allows\n\
 360                           two groups of input sections, one before, and one\n\
 361                           after each stub section.  Values of +/-1 indicate\n\
 362                           the linker should choose suitable defaults.\n"
 363                    ));
 364 '
 365
 366 PARSE_AND_LIST_ARGS_CASES='
 367     case OPTION_MULTI_SUBSPACE:
 368       multi_subspace = 1;
 369       break;
 370
 371     case OPTION_STUBGROUP_SIZE:
 372       {
 373         const char *end;
 374         group_size = bfd_scan_vma (optarg, &end, 0);
 375         if (*end)
 376           einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
 377       }
 378       break;
 379 '
 380
 381 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
 382 #
 383 LDEMUL_AFTER_PARSE=hppaelf_after_parse
 384 LDEMUL_FINISH=hppaelf_finish
 385 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements