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