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_set_output_arch PARAMS ((void));
  31 static void hppaelf_create_output_section_statements PARAMS ((void));
  32 static void hppaelf_delete_padding_statements
  33   PARAMS ((lang_statement_list_type *));
  34 static asection *hppaelf_add_stub_section
  35   PARAMS ((const char *, asection *));
  36 static void hppaelf_layaout_sections_again PARAMS ((void));
  37 static void hppaelf_finish PARAMS ((void));
  38
  39
  40 /* Fake input file for stubs.  */
  41 static lang_input_statement_type *stub_file;
  42
  43
  44 /* Set the output architecture and machine.  */
  45
  46 static void
  47 hppaelf_set_output_arch ()
  48 {
  49   unsigned long machine = 0;
  50
  51   bfd_set_arch_mach (output_bfd, ldfile_output_architecture, machine);
  52 }
  53
  54 /* This is called before the input files are opened.  We create a new
  55    fake input file to hold the stub sections.  */
  56
  57 static void
  58 hppaelf_create_output_section_statements ()
  59 {
  60   stub_file = lang_add_input_file ("linker stubs",
  61                                    lang_input_file_is_fake_enum,
  62                                    NULL);
  63   stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
  64   if (stub_file->the_bfd == NULL
  65       || ! bfd_set_arch_mach (stub_file->the_bfd,
  66                               bfd_get_arch (output_bfd),
  67                               bfd_get_mach (output_bfd)))
  68     {
  69       einfo ("%X%P: can not create BFD %E\n");
  70       return;
  71     }
  72
  73   ldlang_add_file (stub_file);
  74 }
  75
  76 /* Walk all the lang statements splicing out any padding statements from
  77    the list.  */
  78
  79 static void
  80 hppaelf_delete_padding_statements (list)
  81      lang_statement_list_type *list;
  82 {
  83   lang_statement_union_type *s;
  84   lang_statement_union_type **ps;
  85   for (ps = &list->head; (s = *ps) != NULL; ps = &s->next)
  86     {
  87       switch (s->header.type)
  88         {
  89
  90         /* We want to recursively walk these sections.  */
  91         case lang_constructors_statement_enum:
  92           hppaelf_delete_padding_statements (&constructor_list);
  93           break;
  94
  95         case lang_output_section_statement_enum:
  96           hppaelf_delete_padding_statements (&s->output_section_statement.children);
  97           break;
  98
  99         case lang_group_statement_enum:
 100           hppaelf_delete_padding_statements (&s->group_statement.children);
 101           break;
 102
 103         case lang_wild_statement_enum:
 104           hppaelf_delete_padding_statements (&s->wild_statement.children);
 105           break;
 106
 107         /* Here's what we are really looking for.  Splice these out of
 108            the list.  */
 109         case lang_padding_statement_enum:
 110           *ps = s->next;
 111           if (*ps == NULL)
 112             list->tail = ps;
 113           break;
 114
 115         /* We don't care about these cases.  */
 116         case lang_data_statement_enum:
 117         case lang_object_symbols_statement_enum:
 118         case lang_output_statement_enum:
 119         case lang_target_statement_enum:
 120         case lang_input_section_enum:
 121         case lang_input_statement_enum:
 122         case lang_assignment_statement_enum:
 123         case lang_address_statement_enum:
 124           break;
 125
 126         default:
 127           abort ();
 128           break;
 129         }
 130     }
 131 }
 132
 133
 134 struct hook_stub_info
 135 {
 136   lang_statement_list_type add;
 137   asection *input_section;
 138 };
 139
 140 /* Traverse the linker tree to find the spot where the stub goes.  */
 141
 142 static boolean hook_in_stub
 143   PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
 144
 145 static boolean
 146 hook_in_stub (info, lp)
 147      struct hook_stub_info *info;
 148      lang_statement_union_type **lp;
 149 {
 150   lang_statement_union_type *l;
 151   boolean ret;
 152
 153   for (; (l = *lp) != NULL; lp = &l->next)
 154     {
 155       switch (l->header.type)
 156         {
 157         case lang_constructors_statement_enum:
 158           ret = hook_in_stub (info, &constructor_list.head);
 159           if (ret)
 160             return ret;
 161           break;
 162
 163         case lang_output_section_statement_enum:
 164           ret = hook_in_stub (info,
 165                               &l->output_section_statement.children.head);
 166           if (ret)
 167             return ret;
 168           break;
 169
 170         case lang_wild_statement_enum:
 171           ret = hook_in_stub (info, &l->wild_statement.children.head);
 172           if (ret)
 173             return ret;
 174           break;
 175
 176         case lang_group_statement_enum:
 177           ret = hook_in_stub (info, &l->group_statement.children.head);
 178           if (ret)
 179             return ret;
 180           break;
 181
 182         case lang_input_section_enum:
 183           if (l->input_section.section == info->input_section)
 184             {
 185               /* We've found our section.  Insert the stub immediately
 186                  before its associated input section.  */
 187               *lp = info->add.head;
 188               *(info->add.tail) = l;
 189               return true;
 190             }
 191           break;
 192
 193         case lang_data_statement_enum:
 194         case lang_reloc_statement_enum:
 195         case lang_object_symbols_statement_enum:
 196         case lang_output_statement_enum:
 197         case lang_target_statement_enum:
 198         case lang_input_statement_enum:
 199         case lang_assignment_statement_enum:
 200         case lang_padding_statement_enum:
 201         case lang_address_statement_enum:
 202         case lang_fill_statement_enum:
 203           break;
 204
 205         default:
 206           FAIL ();
 207           break;
 208         }
 209     }
 210   return false;
 211 }
 212
 213
 214 /* Call-back for elf32_hppa_size_stubs.  */
 215
 216 /* Create a new stub section, and arrange for it to be linked
 217    immediately before INPUT_SECTION.  */
 218
 219 static asection *
 220 hppaelf_add_stub_section (stub_name, input_section)
 221      const char *stub_name;
 222      asection *input_section;
 223 {
 224   asection *stub_sec;
 225   flagword flags;
 226   asection *output_section;
 227   const char *secname;
 228   lang_output_section_statement_type *os;
 229   struct hook_stub_info info;
 230
 231   stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_name);
 232   if (stub_sec == NULL)
 233     goto err_ret;
 234
 235   flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
 236            | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
 237   if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
 238     goto err_ret;
 239
 240   output_section = input_section->output_section;
 241   secname = bfd_get_section_name (output_section->owner, output_section);
 242   os = lang_output_section_find (secname);
 243
 244   info.input_section = input_section;
 245   lang_list_init (&info.add);
 246   wild_doit (&info.add, stub_sec, os, stub_file);
 247
 248   if (info.add.head == NULL)
 249     goto err_ret;
 250
 251   if (hook_in_stub (&info, &os->children.head))
 252     return stub_sec;
 253
 254  err_ret:
 255   einfo ("%X%P: can not make stub section: %E\n");
 256   return NULL;
 257 }
 258
 259
 260 /* Another call-back for elf32_hppa_size_stubs.  */
 261
 262 static void
 263 hppaelf_layaout_sections_again ()
 264 {
 265   /* If we have changed sizes of the stub sections, then we need
 266      to recalculate all the section offsets.  This may mean we need to
 267      add even more stubs.  */
 268
 269   /* Delete all the padding statements, they're no longer valid.  */
 270   hppaelf_delete_padding_statements (stat_ptr);
 271
 272   /* Resize the sections.  */
 273   lang_size_sections (stat_ptr->head, abs_output_section,
 274                       &stat_ptr->head, 0, (bfd_vma) 0, false);
 275
 276   /* Redo special stuff.  */
 277   ldemul_after_allocation ();
 278
 279   /* Do the assignments again.  */
 280   lang_do_assignments (stat_ptr->head, abs_output_section,
 281                        (fill_type) 0, (bfd_vma) 0);
 282 }
 283
 284
 285 /* Final emulation specific call.  For the PA we use this opportunity
 286    to build linker stubs.  */
 287
 288 static void
 289 hppaelf_finish ()
 290 {
 291   /* If generating a relocateable output file, then we don't
 292      have to examine the relocs.  */
 293   if (link_info.relocateable)
 294     return;
 295
 296   /* Call into the BFD backend to do the real work.  */
 297   if (! elf32_hppa_size_stubs (stub_file->the_bfd,
 298                                &link_info,
 299                                &hppaelf_add_stub_section,
 300                                &hppaelf_layaout_sections_again))
 301     {
 302       einfo ("%X%P: can not size stub section: %E\n");
 303       return;
 304     }
 305
 306   /* Now build the linker stubs.  */
 307   if (stub_file->the_bfd->sections != NULL)
 308     {
 309       if (! elf32_hppa_build_stubs (stub_file->the_bfd, &link_info))
 310         einfo ("%X%P: can not build stubs: %E\n");
 311     }
 312 }
 313
 314 EOF
 315
 316 # Put these routines in ld_${EMULATION_NAME}_emulation
 317 #
 318 LDEMUL_SET_OUTPUT_ARCH=hppaelf_set_output_arch
 319 LDEMUL_FINISH=hppaelf_finish
 320 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements