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${EMULATION_NAME}.c <<EOF
  26
  27 #include "ldctor.h"
  28 #include "elf32-hppa.h"
  29
  30 static void hppaelf_after_parse PARAMS((void));
  31 static void hppaelf_create_output_section_statements PARAMS ((void));
  32 static asection *hppaelf_add_stub_section
  33   PARAMS ((const char *, asection *));
  34 static void hppaelf_layout_sections_again PARAMS ((void));
  35 static void gld${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   /* Resize the sections.  */
 230   lang_size_sections (stat_ptr->head, abs_output_section,
 231                       &stat_ptr->head, 0, (bfd_vma) 0, false);
 232
 233   /* Redo special stuff.  */
 234   ldemul_after_allocation ();
 235
 236   /* Do the assignments again.  */
 237   lang_do_assignments (stat_ptr->head, abs_output_section,
 238                        (fill_type) 0, (bfd_vma) 0);
 239 }
 240
 241
 242 /* Final emulation specific call.  For the PA we use this opportunity
 243    to build linker stubs.  */
 244
 245 static void
 246 gld${EMULATION_NAME}_finish ()
 247 {
 248   /* If generating a relocatable output file, then we don't
 249      have to examine the relocs.  */
 250   if (link_info.relocateable)
 251     return;
 252
 253   /* bfd_elf32_discard_info just plays with debugging sections,
 254      ie. doesn't affect any code, so we can delay resizing the
 255      sections.  It's likely we'll resize everything in the process of
 256      adding stubs.  */
 257   if (bfd_elf${ELFSIZE}_discard_info (&link_info))
 258     need_laying_out = 1;
 259
 260   /* Call into the BFD backend to do the real work.  */
 261   if (! elf32_hppa_size_stubs (output_bfd,
 262                                stub_file->the_bfd,
 263                                &link_info,
 264                                multi_subspace,
 265                                group_size,
 266                                &hppaelf_add_stub_section,
 267                                &hppaelf_layout_sections_again))
 268     {
 269       einfo ("%X%P: can not size stub section: %E\n");
 270       return;
 271     }
 272
 273   if (need_laying_out)
 274     hppaelf_layout_sections_again ();
 275
 276   /* Set the global data pointer.  */
 277   if (! elf32_hppa_set_gp (output_bfd, &link_info))
 278     {
 279       einfo ("%X%P: can not set gp\n");
 280       return;
 281     }
 282
 283   /* Now build the linker stubs.  */
 284   if (stub_file->the_bfd->sections != NULL)
 285     {
 286       if (! elf32_hppa_build_stubs (&link_info))
 287         einfo ("%X%P: can not build stubs: %E\n");
 288     }
 289 }
 290
 291
 292 /* Avoid processing the fake stub_file in vercheck, stat_needed and
 293    check_needed routines.  */
 294
 295 static void hppa_for_each_input_file_wrapper
 296   PARAMS ((lang_input_statement_type *));
 297 static void hppa_lang_for_each_input_file
 298   PARAMS ((void (*) (lang_input_statement_type *)));
 299
 300 static void (*real_func) PARAMS ((lang_input_statement_type *));
 301
 302 static void hppa_for_each_input_file_wrapper (l)
 303      lang_input_statement_type *l;
 304 {
 305   if (l != stub_file)
 306     (*real_func) (l);
 307 }
 308
 309 static void
 310 hppa_lang_for_each_input_file (func)
 311      void (*func) PARAMS ((lang_input_statement_type *));
 312 {
 313   real_func = func;
 314   lang_for_each_input_file (&hppa_for_each_input_file_wrapper);
 315 }
 316
 317 #define lang_for_each_input_file hppa_lang_for_each_input_file
 318
 319 EOF
 320
 321 # Define some shell vars to insert bits of code into the standard elf
 322 # parse_args and list_options functions.
 323 #
 324 PARSE_AND_LIST_PROLOGUE='
 325 #define OPTION_MULTI_SUBSPACE           301
 326 #define OPTION_STUBGROUP_SIZE           (OPTION_MULTI_SUBSPACE + 1)
 327 '
 328
 329 # The options are repeated below so that no abbreviations are allowed.
 330 # Otherwise -s matches stub-group-size
 331 PARSE_AND_LIST_LONGOPTS='
 332   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 333   { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
 334   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 335   { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
 336 '
 337
 338 PARSE_AND_LIST_OPTIONS='
 339   fprintf (file, _("\
 340   --multi-subspace      Generate import and export stubs to support\n\
 341                           multiple sub-space shared libraries\n"
 342                    ));
 343   fprintf (file, _("\
 344   --stub-group-size=N   Maximum size of a group of input sections that can be\n\
 345                           handled by one stub section.  A negative value\n\
 346                           locates all stubs before their branches (with a\n\
 347                           group size of -N), while a positive value allows\n\
 348                           two groups of input sections, one before, and one\n\
 349                           after each stub section.  Values of +/-1 indicate\n\
 350                           the linker should choose suitable defaults.\n"
 351                    ));
 352 '
 353
 354 PARSE_AND_LIST_ARGS_CASES='
 355     case OPTION_MULTI_SUBSPACE:
 356       multi_subspace = 1;
 357       break;
 358
 359     case OPTION_STUBGROUP_SIZE:
 360       {
 361         const char *end;
 362         group_size = bfd_scan_vma (optarg, &end, 0);
 363         if (*end)
 364           einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
 365       }
 366       break;
 367 '
 368
 369 # Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
 370 #
 371 LDEMUL_AFTER_PARSE=hppaelf_after_parse
 372 LDEMUL_FINISH=gld${EMULATION_NAME}_finish
 373 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements