ld/emultempl/hppaelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright (C) 1991, 93, 94, 95, 97, 99, 2000
   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_create_output_section_statements PARAMS ((void));
  31 static void hppaelf_delete_padding_statements
  32   PARAMS ((lang_statement_list_type *));
  33 static asection *hppaelf_add_stub_section
  34   PARAMS ((const char *, asection *));
  35 static void hppaelf_layaout_sections_again PARAMS ((void));
  36 static void hppaelf_finish PARAMS ((void));
  37
  38
  39 /* Fake input file for stubs.  */
  40 static lang_input_statement_type *stub_file;
  41
  42 /* Type of import/export stubs to build.  For a single sub-space model,
  43    we can build smaller import stubs and there is no need for export
  44    stubs.  */
  45 static int multi_subspace = 0;
  46
  47
  48 /* This is called before the input files are opened.  We create a new
  49    fake input file to hold the stub sections.  */
  50
  51 static void
  52 hppaelf_create_output_section_statements ()
  53 {
  54   stub_file = lang_add_input_file ("linker stubs",
  55                                    lang_input_file_is_fake_enum,
  56                                    NULL);
  57   stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
  58   if (stub_file->the_bfd == NULL
  59       || ! bfd_set_arch_mach (stub_file->the_bfd,
  60                               bfd_get_arch (output_bfd),
  61                               bfd_get_mach (output_bfd)))
  62     {
  63       einfo ("%X%P: can not create BFD %E\n");
  64       return;
  65     }
  66
  67   ldlang_add_file (stub_file);
  68 }
  69
  70 /* Walk all the lang statements splicing out any padding statements from
  71    the list.  */
  72
  73 static void
  74 hppaelf_delete_padding_statements (list)
  75      lang_statement_list_type *list;
  76 {
  77   lang_statement_union_type *s;
  78   lang_statement_union_type **ps;
  79   for (ps = &list->head; (s = *ps) != NULL; ps = &s->next)
  80     {
  81       switch (s->header.type)
  82         {
  83
  84         /* We want to recursively walk these sections.  */
  85         case lang_constructors_statement_enum:
  86           hppaelf_delete_padding_statements (&constructor_list);
  87           break;
  88
  89         case lang_output_section_statement_enum:
  90           hppaelf_delete_padding_statements (&s->output_section_statement.children);
  91           break;
  92
  93         case lang_group_statement_enum:
  94           hppaelf_delete_padding_statements (&s->group_statement.children);
  95           break;
  96
  97         case lang_wild_statement_enum:
  98           hppaelf_delete_padding_statements (&s->wild_statement.children);
  99           break;
 100
 101         /* Here's what we are really looking for.  Splice these out of
 102            the list.  */
 103         case lang_padding_statement_enum:
 104           *ps = s->next;
 105           if (*ps == NULL)
 106             list->tail = ps;
 107           break;
 108
 109         /* We don't care about these cases.  */
 110         case lang_data_statement_enum:
 111         case lang_object_symbols_statement_enum:
 112         case lang_output_statement_enum:
 113         case lang_target_statement_enum:
 114         case lang_input_section_enum:
 115         case lang_input_statement_enum:
 116         case lang_assignment_statement_enum:
 117         case lang_address_statement_enum:
 118           break;
 119
 120         default:
 121           abort ();
 122           break;
 123         }
 124     }
 125 }
 126
 127
 128 struct hook_stub_info
 129 {
 130   lang_statement_list_type add;
 131   asection *input_section;
 132 };
 133
 134 /* Traverse the linker tree to find the spot where the stub goes.  */
 135
 136 static boolean hook_in_stub
 137   PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
 138
 139 static boolean
 140 hook_in_stub (info, lp)
 141      struct hook_stub_info *info;
 142      lang_statement_union_type **lp;
 143 {
 144   lang_statement_union_type *l;
 145   boolean ret;
 146
 147   for (; (l = *lp) != NULL; lp = &l->next)
 148     {
 149       switch (l->header.type)
 150         {
 151         case lang_constructors_statement_enum:
 152           ret = hook_in_stub (info, &constructor_list.head);
 153           if (ret)
 154             return ret;
 155           break;
 156
 157         case lang_output_section_statement_enum:
 158           ret = hook_in_stub (info,
 159                               &l->output_section_statement.children.head);
 160           if (ret)
 161             return ret;
 162           break;
 163
 164         case lang_wild_statement_enum:
 165           ret = hook_in_stub (info, &l->wild_statement.children.head);
 166           if (ret)
 167             return ret;
 168           break;
 169
 170         case lang_group_statement_enum:
 171           ret = hook_in_stub (info, &l->group_statement.children.head);
 172           if (ret)
 173             return ret;
 174           break;
 175
 176         case lang_input_section_enum:
 177           if (l->input_section.section == info->input_section)
 178             {
 179               /* We've found our section.  Insert the stub immediately
 180                  before its associated input section.  */
 181               *lp = info->add.head;
 182               *(info->add.tail) = l;
 183               return true;
 184             }
 185           break;
 186
 187         case lang_data_statement_enum:
 188         case lang_reloc_statement_enum:
 189         case lang_object_symbols_statement_enum:
 190         case lang_output_statement_enum:
 191         case lang_target_statement_enum:
 192         case lang_input_statement_enum:
 193         case lang_assignment_statement_enum:
 194         case lang_padding_statement_enum:
 195         case lang_address_statement_enum:
 196         case lang_fill_statement_enum:
 197           break;
 198
 199         default:
 200           FAIL ();
 201           break;
 202         }
 203     }
 204   return false;
 205 }
 206
 207
 208 /* Call-back for elf32_hppa_size_stubs.  */
 209
 210 /* Create a new stub section, and arrange for it to be linked
 211    immediately before INPUT_SECTION.  */
 212
 213 static asection *
 214 hppaelf_add_stub_section (stub_name, input_section)
 215      const char *stub_name;
 216      asection *input_section;
 217 {
 218   asection *stub_sec;
 219   flagword flags;
 220   asection *output_section;
 221   const char *secname;
 222   lang_output_section_statement_type *os;
 223   struct hook_stub_info info;
 224
 225   stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_name);
 226   if (stub_sec == NULL)
 227     goto err_ret;
 228
 229   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 230            | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 231   if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
 232     goto err_ret;
 233
 234   output_section = input_section->output_section;
 235   secname = bfd_get_section_name (output_section->owner, output_section);
 236   os = lang_output_section_find (secname);
 237
 238   info.input_section = input_section;
 239   lang_list_init (&info.add);
 240   wild_doit (&info.add, stub_sec, os, stub_file);
 241
 242   if (info.add.head == NULL)
 243     goto err_ret;
 244
 245   if (hook_in_stub (&info, &os->children.head))
 246     return stub_sec;
 247
 248  err_ret:
 249   einfo ("%X%P: can not make stub section: %E\n");
 250   return NULL;
 251 }
 252
 253
 254 /* Another call-back for elf32_hppa_size_stubs.  */
 255
 256 static void
 257 hppaelf_layaout_sections_again ()
 258 {
 259   /* If we have changed sizes of the stub sections, then we need
 260      to recalculate all the section offsets.  This may mean we need to
 261      add even more stubs.  */
 262
 263   /* Delete all the padding statements, they're no longer valid.  */
 264   hppaelf_delete_padding_statements (stat_ptr);
 265
 266   /* Resize the sections.  */
 267   lang_size_sections (stat_ptr->head, abs_output_section,
 268                       &stat_ptr->head, 0, (bfd_vma) 0, false);
 269
 270   /* Redo special stuff.  */
 271   ldemul_after_allocation ();
 272
 273   /* Do the assignments again.  */
 274   lang_do_assignments (stat_ptr->head, abs_output_section,
 275                        (fill_type) 0, (bfd_vma) 0);
 276 }
 277
 278
 279 /* Final emulation specific call.  For the PA we use this opportunity
 280    to build linker stubs.  */
 281
 282 static void
 283 hppaelf_finish ()
 284 {
 285   /* If generating a relocateable output file, then we don't
 286      have to examine the relocs.  */
 287   if (link_info.relocateable)
 288     return;
 289
 290   /* Call into the BFD backend to do the real work.  */
 291   if (! elf32_hppa_size_stubs (stub_file->the_bfd,
 292                                multi_subspace,
 293                                &link_info,
 294                                &hppaelf_add_stub_section,
 295                                &hppaelf_layaout_sections_again))
 296     {
 297       einfo ("%X%P: can not size stub section: %E\n");
 298       return;
 299     }
 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->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 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 318    check_needed routines.  */
 319
 320 static void hppa_for_each_input_file_wrapper
 321   PARAMS ((lang_input_statement_type *));
 322 static void hppa_lang_for_each_input_file
 323   PARAMS ((void (*) (lang_input_statement_type *)));
 324
 325 static void (*real_func) PARAMS ((lang_input_statement_type *));
 326
 327 static void hppa_for_each_input_file_wrapper (l)
 328      lang_input_statement_type *l;
 329 {
 330   if (l != stub_file)
 331     (*real_func) (l);
 332 }
 333
 334 static void
 335 hppa_lang_for_each_input_file (func)
 336      void (*func) PARAMS ((lang_input_statement_type *));
 337 {
 338   real_func = func;
 339   lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
 340 }
 341
 342 #define lang_for_each_input_file hppa_lang_for_each_input_file
 343
 344 EOF
 345
 346 # Define some shell vars to insert bits of code into the standard elf
 347 # parse_args and list_options functions.
 348 #
 349 PARSE_AND_LIST_PROLOGUE='
 350 #define OPTION_MULTI_SUBSPACE           301
 351 '
 352
 353 PARSE_AND_LIST_LONGOPTS='
 354   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE},
 355 '
 356
 357 PARSE_AND_LIST_OPTIONS='
 358   fprintf (file, _("\
 359   --multi-subspace            Generate import and export stubs to support\n\
 360                               multiple sub-space shared libraries\n"
 361                    ));
 362 '
 363
 364 PARSE_AND_LIST_ARGS_CASES='
 365     case OPTION_MULTI_SUBSPACE:
 366       multi_subspace = 1;
 367       break;
 368 '
 369
 370 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
 371 #
 372 LDEMUL_FINISH=hppaelf_finish
 373 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements