ld/emultempl/hppaelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002
   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${EMULATION_NAME}.c <<EOF
  26
  27 #include "ldctor.h"
  28 #include "elf32-hppa.h"
  29
  30 static void hppaelf_after_parse PARAMS((void));
  31 static void hppaelf_create_output_section_statements PARAMS ((void));
  32 static asection *hppaelf_add_stub_section
  33   PARAMS ((const char *, asection *));
  34 static void hppaelf_layout_sections_again PARAMS ((void));
  35 static void gld${EMULATION_NAME}_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 /* Whether we need to call hppa_layout_sections_again.  */
  47 static int need_laying_out = 0;
  48
  49 /* Maximum size of a group of input sections that can be handled by
  50    one stub section.  A value of +/-1 indicates the bfd back-end
  51    should use a suitable default size.  */
  52 static bfd_signed_vma group_size = 1;
  53
  54 /* Stops the linker merging .text sections on a relocatable link,
  55    and adds millicode library to the list of input files.  */
  56
  57 static void
  58 hppaelf_after_parse ()
  59 {
  60   if (link_info.relocateable)
  61     lang_add_unique (".text");
  62 #if 0 /* enable this once we split millicode stuff from libgcc */
  63   else
  64     lang_add_input_file ("milli",
  65                          lang_input_file_is_l_enum,
  66                          NULL);
  67 #endif
  68 }
  69
  70 /* This is called before the input files are opened.  We create a new
  71    fake input file to hold the stub sections.  */
  72
  73 static void
  74 hppaelf_create_output_section_statements ()
  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 boolean hook_in_stub
 102   PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
 103
 104 static boolean
 105 hook_in_stub (info, lp)
 106      struct hook_stub_info *info;
 107      lang_statement_union_type **lp;
 108 {
 109   lang_statement_union_type *l;
 110   boolean ret;
 111
 112   for (; (l = *lp) != NULL; lp = &l->header.next)
 113     {
 114       switch (l->header.type)
 115         {
 116         case lang_constructors_statement_enum:
 117           ret = hook_in_stub (info, &constructor_list.head);
 118           if (ret)
 119             return ret;
 120           break;
 121
 122         case lang_output_section_statement_enum:
 123           ret = hook_in_stub (info,
 124                               &l->output_section_statement.children.head);
 125           if (ret)
 126             return ret;
 127           break;
 128
 129         case lang_wild_statement_enum:
 130           ret = hook_in_stub (info, &l->wild_statement.children.head);
 131           if (ret)
 132             return ret;
 133           break;
 134
 135         case lang_group_statement_enum:
 136           ret = hook_in_stub (info, &l->group_statement.children.head);
 137           if (ret)
 138             return ret;
 139           break;
 140
 141         case lang_input_section_enum:
 142           if (l->input_section.section == info->input_section)
 143             {
 144               /* We've found our section.  Insert the stub immediately
 145                  before its associated input section.  */
 146               *lp = info->add.head;
 147               *(info->add.tail) = l;
 148               return true;
 149             }
 150           break;
 151
 152         case lang_data_statement_enum:
 153         case lang_reloc_statement_enum:
 154         case lang_object_symbols_statement_enum:
 155         case lang_output_statement_enum:
 156         case lang_target_statement_enum:
 157         case lang_input_statement_enum:
 158         case lang_assignment_statement_enum:
 159         case lang_padding_statement_enum:
 160         case lang_address_statement_enum:
 161         case lang_fill_statement_enum:
 162           break;
 163
 164         default:
 165           FAIL ();
 166           break;
 167         }
 168     }
 169   return false;
 170 }
 171
 172
 173 /* Call-back for elf32_hppa_size_stubs.  */
 174
 175 /* Create a new stub section, and arrange for it to be linked
 176    immediately before INPUT_SECTION.  */
 177
 178 static asection *
 179 hppaelf_add_stub_section (stub_sec_name, input_section)
 180      const char *stub_sec_name;
 181      asection *input_section;
 182 {
 183   asection *stub_sec;
 184   flagword flags;
 185   asection *output_section;
 186   const char *secname;
 187   lang_output_section_statement_type *os;
 188   struct hook_stub_info info;
 189
 190   stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
 191   if (stub_sec == NULL)
 192     goto err_ret;
 193
 194   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 195            | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
 196   if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
 197     goto err_ret;
 198
 199   output_section = input_section->output_section;
 200   secname = bfd_get_section_name (output_section->owner, output_section);
 201   os = lang_output_section_find (secname);
 202
 203   info.input_section = input_section;
 204   lang_list_init (&info.add);
 205   lang_add_section (&info.add, stub_sec, os, stub_file);
 206
 207   if (info.add.head == NULL)
 208     goto err_ret;
 209
 210   if (hook_in_stub (&info, &os->children.head))
 211     return stub_sec;
 212
 213  err_ret:
 214   einfo ("%X%P: can not make stub section: %E\n");
 215   return NULL;
 216 }
 217
 218
 219 /* Another call-back for elf32_hppa_size_stubs.  */
 220
 221 static void
 222 hppaelf_layout_sections_again ()
 223 {
 224   /* If we have changed sizes of the stub sections, then we need
 225      to recalculate all the section offsets.  This may mean we need to
 226      add even more stubs.  */
 227   need_laying_out = 0;
 228
 229   lang_reset_memory_regions ();
 230
 231   /* Resize the sections.  */
 232   lang_size_sections (stat_ptr->head, abs_output_section,
 233                       &stat_ptr->head, 0, (bfd_vma) 0, NULL);
 234
 235   /* Redo special stuff.  */
 236   ldemul_after_allocation ();
 237
 238   /* Do the assignments again.  */
 239   lang_do_assignments (stat_ptr->head, abs_output_section,
 240                        (fill_type) 0, (bfd_vma) 0);
 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${EMULATION_NAME}_finish ()
 249 {
 250   /* If generating a relocatable output file, then we don't
 251      have to examine the relocs.  */
 252   if (link_info.relocateable)
 253     return;
 254
 255   /* bfd_elf32_discard_info just plays with debugging sections,
 256      ie. doesn't affect any code, so we can delay resizing the
 257      sections.  It's likely we'll resize everything in the process of
 258      adding stubs.  */
 259   if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
 260     need_laying_out = 1;
 261
 262   /* Call into the BFD backend to do the real work.  */
 263   if (! elf32_hppa_size_stubs (output_bfd,
 264                                stub_file->the_bfd,
 265                                &link_info,
 266                                multi_subspace,
 267                                group_size,
 268                                &hppaelf_add_stub_section,
 269                                &hppaelf_layout_sections_again))
 270     {
 271       einfo ("%X%P: can not size stub section: %E\n");
 272       return;
 273     }
 274
 275   if (need_laying_out)
 276     hppaelf_layout_sections_again ();
 277
 278   /* Set the global data pointer.  */
 279   if (! elf32_hppa_set_gp (output_bfd, &link_info))
 280     {
 281       einfo ("%X%P: can not set gp\n");
 282       return;
 283     }
 284
 285   /* Now build the linker stubs.  */
 286   if (stub_file->the_bfd->sections != NULL)
 287     {
 288       if (! elf32_hppa_build_stubs (&link_info))
 289         einfo ("%X%P: can not build stubs: %E\n");
 290     }
 291 }
 292
 293
 294 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 295    check_needed routines.  */
 296
 297 static void hppa_for_each_input_file_wrapper
 298   PARAMS ((lang_input_statement_type *));
 299 static void hppa_lang_for_each_input_file
 300   PARAMS ((void (*) (lang_input_statement_type *)));
 301
 302 static void (*real_func) PARAMS ((lang_input_statement_type *));
 303
 304 static void hppa_for_each_input_file_wrapper (l)
 305      lang_input_statement_type *l;
 306 {
 307   if (l != stub_file)
 308     (*real_func) (l);
 309 }
 310
 311 static void
 312 hppa_lang_for_each_input_file (func)
 313      void (*func) PARAMS ((lang_input_statement_type *));
 314 {
 315   real_func = func;
 316   lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
 317 }
 318
 319 #define lang_for_each_input_file hppa_lang_for_each_input_file
 320
 321 EOF
 322
 323 # Define some shell vars to insert bits of code into the standard elf
 324 # parse_args and list_options functions.
 325 #
 326 PARSE_AND_LIST_PROLOGUE='
 327 #define OPTION_MULTI_SUBSPACE           301
 328 #define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
 329 '
 330
 331 # The options are repeated below so that no abbreviations are allowed.
 332 # Otherwise -s matches stub-group-size
 333 PARSE_AND_LIST_LONGOPTS='
 334   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 335   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 336   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 337   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 338 '
 339
 340 PARSE_AND_LIST_OPTIONS='
 341   fprintf (file, _("\
 342   --multi-subspace      Generate import and export stubs to support\n\
 343                           multiple sub-space shared libraries\n"
 344                    ));
 345   fprintf (file, _("\
 346   --stub-group-size=N   Maximum size of a group of input sections that can be\n\
 347                           handled by one stub section.  A negative value\n\
 348                           locates all stubs before their branches (with a\n\
 349                           group size of -N), while a positive value allows\n\
 350                           two groups of input sections, one before, and one\n\
 351                           after each stub section.  Values of +/-1 indicate\n\
 352                           the linker should choose suitable defaults.\n"
 353                    ));
 354 '
 355
 356 PARSE_AND_LIST_ARGS_CASES='
 357     case OPTION_MULTI_SUBSPACE:
 358       multi_subspace = 1;
 359       break;
 360
 361     case OPTION_STUBGROUP_SIZE:
 362       {
 363         const char *end;
 364         group_size = bfd_scan_vma (optarg, &end, 0);
 365         if (*end)
 366           einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
 367       }
 368       break;
 369 '
 370
 371 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
 372 #
 373 LDEMUL_AFTER_PARSE=hppaelf_after_parse
 374 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
 375 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements