ld/emultempl/hppaelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001
   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 static void hppaelf_after_parse PARAMS((void));
  31 static void hppaelf_create_output_section_statements PARAMS ((void));
  32 static asection *hppaelf_add_stub_section
  33   PARAMS ((const char *, asection *));
  34 static void hppaelf_layaout_sections_again PARAMS ((void));
  35 static void hppaelf_finish PARAMS ((void));
  36
  37
  38 /* Fake input file for stubs.  */
  39 static lang_input_statement_type *stub_file;
  40
  41 /* Type of import/export stubs to build.  For a single sub-space model,
  42    we can build smaller import stubs and there is no need for export
  43    stubs.  */
  44 static int multi_subspace = 0;
  45
  46 /* Maximum size of a group of input sections that can be handled by
  47    one stub section.  A value of +/-1 indicates the bfd back-end
  48    should use a suitable default size.  */
  49 static bfd_signed_vma group_size = 1;
  50
  51 /* Stops the linker merging .text sections on a relocatable link,
  52    and adds millicode library to the list of input files.  */
  53
  54 static void
  55 hppaelf_after_parse ()
  56 {
  57   if (link_info.relocateable)
  58     lang_add_unique (".text");
  59 #if 0 /* enable this once we split millicode stuff from libgcc */
  60   else
  61     lang_add_input_file ("milli",
  62                          lang_input_file_is_l_enum,
  63                          NULL);
  64 #endif
  65 }
  66
  67 /* This is called before the input files are opened.  We create a new
  68    fake input file to hold the stub sections.  */
  69
  70 static void
  71 hppaelf_create_output_section_statements ()
  72 {
  73   stub_file = lang_add_input_file ("linker stubs",
  74                                    lang_input_file_is_fake_enum,
  75                                    NULL);
  76   stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
  77   if (stub_file->the_bfd == NULL
  78       || ! bfd_set_arch_mach (stub_file->the_bfd,
  79                               bfd_get_arch (output_bfd),
  80                               bfd_get_mach (output_bfd)))
  81     {
  82       einfo ("%X%P: can not create BFD %E\n");
  83       return;
  84     }
  85
  86   ldlang_add_file (stub_file);
  87 }
  88
  89
  90 struct hook_stub_info
  91 {
  92   lang_statement_list_type add;
  93   asection *input_section;
  94 };
  95
  96 /* Traverse the linker tree to find the spot where the stub goes.  */
  97
  98 static boolean hook_in_stub
  99   PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
 100
 101 static boolean
 102 hook_in_stub (info, lp)
 103      struct hook_stub_info *info;
 104      lang_statement_union_type **lp;
 105 {
 106   lang_statement_union_type *l;
 107   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 (stub_sec_name, input_section)
 177      const char *stub_sec_name;
 178      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, stub_file);
 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_layaout_sections_again ()
 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
 225   /* Resize the sections.  */
 226   lang_size_sections (stat_ptr->head, abs_output_section,
 227                       &stat_ptr->head, 0, (bfd_vma) 0, false);
 228
 229   /* Redo special stuff.  */
 230   ldemul_after_allocation ();
 231
 232   /* Do the assignments again.  */
 233   lang_do_assignments (stat_ptr->head, abs_output_section,
 234                        (fill_type) 0, (bfd_vma) 0);
 235 }
 236
 237
 238 /* Final emulation specific call.  For the PA we use this opportunity
 239    to build linker stubs.  */
 240
 241 static void
 242 hppaelf_finish ()
 243 {
 244   /* If generating a relocatable output file, then we don't
 245      have to examine the relocs.  */
 246   if (link_info.relocateable)
 247     return;
 248
 249   /* Call into the BFD backend to do the real work.  */
 250   if (! elf32_hppa_size_stubs (output_bfd,
 251                                stub_file->the_bfd,
 252                                &link_info,
 253                                multi_subspace,
 254                                group_size,
 255                                &hppaelf_add_stub_section,
 256                                &hppaelf_layaout_sections_again))
 257     {
 258       einfo ("%X%P: can not size stub section: %E\n");
 259       return;
 260     }
 261
 262   /* Set the global data pointer.  */
 263   if (! elf32_hppa_set_gp (output_bfd, &link_info))
 264     {
 265       einfo ("%X%P: can not set gp\n");
 266       return;
 267     }
 268
 269   /* Now build the linker stubs.  */
 270   if (stub_file->the_bfd->sections != NULL)
 271     {
 272       if (! elf32_hppa_build_stubs (&link_info))
 273         einfo ("%X%P: can not build stubs: %E\n");
 274     }
 275 }
 276
 277
 278 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 279    check_needed routines.  */
 280
 281 static void hppa_for_each_input_file_wrapper
 282   PARAMS ((lang_input_statement_type *));
 283 static void hppa_lang_for_each_input_file
 284   PARAMS ((void (*) (lang_input_statement_type *)));
 285
 286 static void (*real_func) PARAMS ((lang_input_statement_type *));
 287
 288 static void hppa_for_each_input_file_wrapper (l)
 289      lang_input_statement_type *l;
 290 {
 291   if (l != stub_file)
 292     (*real_func) (l);
 293 }
 294
 295 static void
 296 hppa_lang_for_each_input_file (func)
 297      void (*func) PARAMS ((lang_input_statement_type *));
 298 {
 299   real_func = func;
 300   lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
 301 }
 302
 303 #define lang_for_each_input_file hppa_lang_for_each_input_file
 304
 305 EOF
 306
 307 # Define some shell vars to insert bits of code into the standard elf
 308 # parse_args and list_options functions.
 309 #
 310 PARSE_AND_LIST_PROLOGUE='
 311 #define OPTION_MULTI_SUBSPACE           301
 312 #define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
 313 '
 314
 315 # The options are repeated below so that no abbreviations are allowed.
 316 # Otherwise -s matches stub-group-size
 317 PARSE_AND_LIST_LONGOPTS='
 318   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 319   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 320   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 321   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 322 '
 323
 324 PARSE_AND_LIST_OPTIONS='
 325   fprintf (file, _("\
 326   --multi-subspace    Generate import and export stubs to support\n\
 327                         multiple sub-space shared libraries\n"
 328                    ));
 329   fprintf (file, _("\
 330   --stub-group-size=N Maximum size of a group of input sections that can be\n\
 331                         handled by one stub section.  A negative value\n\
 332                         locates all stubs before their branches (with a\n\
 333                         group size of -N), while a positive value allows\n\
 334                         two groups of input sections, one before, and one\n\
 335                         after each stub section.  Values of +/-1 indicate\n\
 336                         the linker should choose suitable defaults."
 337                    ));
 338 '
 339
 340 PARSE_AND_LIST_ARGS_CASES='
 341     case OPTION_MULTI_SUBSPACE:
 342       multi_subspace = 1;
 343       break;
 344
 345     case OPTION_STUBGROUP_SIZE:
 346       {
 347         const char *end;
 348         group_size = bfd_scan_vma (optarg, &end, 0);
 349         if (*end)
 350           einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
 351       }
 352       break;
 353 '
 354
 355 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
 356 #
 357 LDEMUL_AFTER_PARSE=hppaelf_after_parse
 358 LDEMUL_FINISH=hppaelf_finish
 359 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements