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 #if 0 /* Enable this once we split millicode stuff from libgcc.  */
  56   else
  57     lang_add_input_file ("milli",
  58                          lang_input_file_is_l_enum,
  59                          NULL);
  60 #endif
  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   stub_file = lang_add_input_file ("linker stubs",
  70                                    lang_input_file_is_fake_enum,
  71                                    NULL);
  72   stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
  73   if (stub_file->the_bfd == NULL
  74       || ! bfd_set_arch_mach (stub_file->the_bfd,
  75                               bfd_get_arch (output_bfd),
  76                               bfd_get_mach (output_bfd)))
  77     {
  78       einfo ("%X%P: can not create BFD %E\n");
  79       return;
  80     }
  81
  82   ldlang_add_file (stub_file);
  83 }
  84
  85
  86 struct hook_stub_info
  87 {
  88   lang_statement_list_type add;
  89   asection *input_section;
  90 };
  91
  92 /* Traverse the linker tree to find the spot where the stub goes.  */
  93
  94 static bfd_boolean
  95 hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
  96 {
  97   lang_statement_union_type *l;
  98   bfd_boolean ret;
  99
 100   for (; (l = *lp) != NULL; lp = &l->header.next)
 101     {
 102       switch (l->header.type)
 103         {
 104         case lang_constructors_statement_enum:
 105           ret = hook_in_stub (info, &constructor_list.head);
 106           if (ret)
 107             return ret;
 108           break;
 109
 110         case lang_output_section_statement_enum:
 111           ret = hook_in_stub (info,
 112                               &l->output_section_statement.children.head);
 113           if (ret)
 114             return ret;
 115           break;
 116
 117         case lang_wild_statement_enum:
 118           ret = hook_in_stub (info, &l->wild_statement.children.head);
 119           if (ret)
 120             return ret;
 121           break;
 122
 123         case lang_group_statement_enum:
 124           ret = hook_in_stub (info, &l->group_statement.children.head);
 125           if (ret)
 126             return ret;
 127           break;
 128
 129         case lang_input_section_enum:
 130           if (l->input_section.section == info->input_section)
 131             {
 132               /* We've found our section.  Insert the stub immediately
 133                  before its associated input section.  */
 134               *lp = info->add.head;
 135               *(info->add.tail) = l;
 136               return TRUE;
 137             }
 138           break;
 139
 140         case lang_data_statement_enum:
 141         case lang_reloc_statement_enum:
 142         case lang_object_symbols_statement_enum:
 143         case lang_output_statement_enum:
 144         case lang_target_statement_enum:
 145         case lang_input_statement_enum:
 146         case lang_assignment_statement_enum:
 147         case lang_padding_statement_enum:
 148         case lang_address_statement_enum:
 149         case lang_fill_statement_enum:
 150           break;
 151
 152         default:
 153           FAIL ();
 154           break;
 155         }
 156     }
 157   return FALSE;
 158 }
 159
 160
 161 /* Call-back for elf32_hppa_size_stubs.  */
 162
 163 /* Create a new stub section, and arrange for it to be linked
 164    immediately before INPUT_SECTION.  */
 165
 166 static asection *
 167 hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
 168 {
 169   asection *stub_sec;
 170   flagword flags;
 171   asection *output_section;
 172   const char *secname;
 173   lang_output_section_statement_type *os;
 174   struct hook_stub_info info;
 175
 176   stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
 177   if (stub_sec == NULL)
 178     goto err_ret;
 179
 180   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 181            | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 182   if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
 183     goto err_ret;
 184
 185   output_section = input_section->output_section;
 186   secname = bfd_get_section_name (output_section->owner, output_section);
 187   os = lang_output_section_find (secname);
 188
 189   info.input_section = input_section;
 190   lang_list_init (&info.add);
 191   lang_add_section (&info.add, stub_sec, os, stub_file);
 192
 193   if (info.add.head == NULL)
 194     goto err_ret;
 195
 196   if (hook_in_stub (&info, &os->children.head))
 197     return stub_sec;
 198
 199  err_ret:
 200   einfo ("%X%P: can not make stub section: %E\n");
 201   return NULL;
 202 }
 203
 204
 205 /* Another call-back for elf32_hppa_size_stubs.  */
 206
 207 static void
 208 hppaelf_layout_sections_again (void)
 209 {
 210   /* If we have changed sizes of the stub sections, then we need
 211      to recalculate all the section offsets.  This may mean we need to
 212      add even more stubs.  */
 213   need_laying_out = 0;
 214
 215   lang_reset_memory_regions ();
 216
 217   /* Resize the sections.  */
 218   lang_size_sections (stat_ptr->head, abs_output_section,
 219                       &stat_ptr->head, 0, (bfd_vma) 0, NULL, TRUE);
 220
 221   /* Redo special stuff.  */
 222   ldemul_after_allocation ();
 223
 224   /* Do the assignments again.  */
 225   lang_do_assignments (stat_ptr->head, abs_output_section,
 226                        (fill_type *) 0, (bfd_vma) 0);
 227 }
 228
 229
 230 static void
 231 build_section_lists (lang_statement_union_type *statement)
 232 {
 233   if (statement->header.type == lang_input_section_enum
 234       && !statement->input_section.ifile->just_syms_flag
 235       && statement->input_section.section->output_section != NULL
 236       && statement->input_section.section->output_section->owner == output_bfd)
 237     {
 238       elf32_hppa_next_input_section (&link_info,
 239                                      statement->input_section.section);
 240     }
 241 }
 242
 243
 244 /* Final emulation specific call.  For the PA we use this opportunity
 245    to build linker stubs.  */
 246
 247 static void
 248 gld${EMULATION_NAME}_finish (void)
 249 {
 250   /* bfd_elf32_discard_info just plays with debugging sections,
 251      ie. doesn't affect any code, so we can delay resizing the
 252      sections.  It's likely we'll resize everything in the process of
 253      adding stubs.  */
 254   if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
 255     need_laying_out = 1;
 256
 257   /* If generating a relocatable output file, then we don't
 258      have to examine the relocs.  */
 259   if (! link_info.relocatable)
 260     {
 261       int ret = elf32_hppa_setup_section_lists (output_bfd, &link_info);
 262
 263       if (ret != 0)
 264         {
 265           if (ret < 0)
 266             {
 267               einfo ("%X%P: can not size stub section: %E\n");
 268               return;
 269             }
 270
 271           lang_for_each_statement (build_section_lists);
 272
 273           /* Call into the BFD backend to do the real work.  */
 274           if (! elf32_hppa_size_stubs (output_bfd,
 275                                        stub_file->the_bfd,
 276                                        &link_info,
 277                                        multi_subspace,
 278                                        group_size,
 279                                        &hppaelf_add_stub_section,
 280                                        &hppaelf_layout_sections_again))
 281             {
 282               einfo ("%X%P: can not size stub section: %E\n");
 283               return;
 284             }
 285         }
 286     }
 287
 288   if (need_laying_out)
 289     hppaelf_layout_sections_again ();
 290
 291   if (! link_info.relocatable)
 292     {
 293       /* Set the global data pointer.  */
 294       if (! elf32_hppa_set_gp (output_bfd, &link_info))
 295         {
 296           einfo ("%X%P: can not set gp\n");
 297           return;
 298         }
 299
 300       /* Now build the linker stubs.  */
 301       if (stub_file->the_bfd->sections != NULL)
 302         {
 303           if (! elf32_hppa_build_stubs (&link_info))
 304             einfo ("%X%P: can not build stubs: %E\n");
 305         }
 306     }
 307 }
 308
 309
 310 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 311    check_needed routines.  */
 312
 313 static void (*real_func) (lang_input_statement_type *);
 314
 315 static void hppa_for_each_input_file_wrapper (lang_input_statement_type *l)
 316 {
 317   if (l != stub_file)
 318     (*real_func) (l);
 319 }
 320
 321 static void
 322 hppa_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
 323 {
 324   real_func = func;
 325   lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
 326 }
 327
 328 #define lang_for_each_input_file hppa_lang_for_each_input_file
 329
 330 EOF
 331
 332 # Define some shell vars to insert bits of code into the standard elf
 333 # parse_args and list_options functions.
 334 #
 335 PARSE_AND_LIST_PROLOGUE='
 336 #define OPTION_MULTI_SUBSPACE           301
 337 #define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
 338 '
 339
 340 PARSE_AND_LIST_LONGOPTS='
 341   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 342   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 343 '
 344
 345 PARSE_AND_LIST_OPTIONS='
 346   fprintf (file, _("\
 347   --multi-subspace      Generate import and export stubs to support\n\
 348                           multiple sub-space shared libraries\n"
 349                    ));
 350   fprintf (file, _("\
 351   --stub-group-size=N   Maximum size of a group of input sections that can be\n\
 352                           handled by one stub section.  A negative value\n\
 353                           locates all stubs before their branches (with a\n\
 354                           group size of -N), while a positive value allows\n\
 355                           two groups of input sections, one before, and one\n\
 356                           after each stub section.  Values of +/-1 indicate\n\
 357                           the linker should 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_FINISH=gld${EMULATION_NAME}_finish
 380 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements