ld/emultempl/hppaelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 cat >e${EMULATION_NAME}.c <<EOF
   4 /* An emulation for HP PA-RISC ELF linkers.
   5    Copyright (C) 1991, 93, 94, 95, 97, 1999 Free Software Foundation, Inc.
   6    Written by Steve Chamberlain steve@cygnus.com
   7
   8 This file is part of GLD, the Gnu Linker.
   9
  10 This program is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2 of the License, or
  13 (at your option) any later version.
  14
  15 This program is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with this program; if not, write to the Free Software
  22 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  23
  24 #include "bfd.h"
  25 #include "sysdep.h"
  26 #include "bfdlink.h"
  27
  28 #include "ld.h"
  29 #include "ldemul.h"
  30 #include "ldfile.h"
  31 #include "ldexp.h"
  32 #include "ldlang.h"
  33 #include "ldmisc.h"
  34 #include "ldmain.h"
  35 #include "ldctor.h"
  36
  37 /* Section in which we build stubs.  */
  38 static asection *stub_sec;
  39 static lang_input_statement_type *stub_file;
  40
  41
  42 /* FIXME.  This doesn't belong here.  */
  43 extern lang_statement_list_type file_chain;
  44
  45 /* Perform some emulation specific initialization.  For PA ELF we set
  46    up the local label prefix and the output architecture.  */
  47
  48 static void
  49 hppaelf_before_parse ()
  50 {
  51   ldfile_output_architecture = bfd_arch_hppa;
  52 }
  53
  54 /* Set the output architecture and machine.  */
  55
  56 static void
  57 hppaelf_set_output_arch()
  58 {
  59   unsigned long machine = 0;
  60
  61   bfd_set_arch_mach (output_bfd, ldfile_output_architecture, machine);
  62 }
  63
  64 /* This is called before the input files are opened.  We create a new
  65    fake input file to hold the stub section.  */
  66
  67 static void
  68 hppaelf_create_output_section_statements ()
  69 {
  70   stub_file = lang_add_input_file ("linker stubs",
  71                                    lang_input_file_is_fake_enum,
  72                                    NULL);
  73   stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
  74   if (stub_file->the_bfd == NULL
  75       || ! bfd_set_arch_mach (stub_file->the_bfd,
  76                               bfd_get_arch (output_bfd),
  77                               bfd_get_mach (output_bfd)))
  78     {
  79       einfo ("%X%P: can not create BFD %E\n");
  80       return;
  81     }
  82
  83   stub_sec = bfd_make_section_old_way (stub_file->the_bfd, ".text");
  84   /* Don't set SEC_RELOC until we actually have relocations in this
  85      section.  */
  86   if (stub_sec == NULL
  87       || ! bfd_set_section_flags (stub_file->the_bfd, stub_sec,
  88                                   (SEC_HAS_CONTENTS
  89                                    | SEC_ALLOC
  90                                    | SEC_LOAD
  91                                    | SEC_CODE
  92                                    | SEC_IN_MEMORY)))
  93     {
  94       einfo ("%X%P: can not create stub section: %E\n");
  95       return;
  96     }
  97
  98   ldlang_add_file (stub_file);
  99 }
 100
 101 /* Walk all the lang statements splicing out any padding statements from
 102    the list.  */
 103
 104 static void
 105 hppaelf_delete_padding_statements (s, prev)
 106      lang_statement_union_type *s;
 107      lang_statement_union_type **prev;
 108 {
 109   lang_statement_union_type *sprev = NULL;
 110   for (; s != NULL; s = s->next)
 111     {
 112       switch (s->header.type)
 113         {
 114
 115         /* We want recursively walk these sections.  */
 116         case lang_constructors_statement_enum:
 117           hppaelf_delete_padding_statements (constructor_list.head,
 118                                              &constructor_list.head);
 119           break;
 120
 121         case lang_output_section_statement_enum:
 122           hppaelf_delete_padding_statements (s->output_section_statement.
 123                                                children.head,
 124                                              &s->output_section_statement.
 125                                                children.head);
 126           break;
 127
 128         /* Huh?  What is a lang_wild_statement?  */
 129         case lang_wild_statement_enum:
 130           hppaelf_delete_padding_statements (s->wild_statement.
 131                                                children.head,
 132                                              &s->wild_statement.
 133                                                children.head);
 134           break;
 135
 136         /* Here's what we are really looking for.  Splice these out of
 137            the list.  */
 138         case lang_padding_statement_enum:
 139           if (sprev)
 140             sprev->header.next = s->header.next;
 141           else
 142             **prev = *s;
 143           break;
 144
 145         /* We don't care about these cases.  */
 146         case lang_data_statement_enum:
 147         case lang_object_symbols_statement_enum:
 148         case lang_output_statement_enum:
 149         case lang_target_statement_enum:
 150         case lang_input_section_enum:
 151         case lang_input_statement_enum:
 152         case lang_assignment_statement_enum:
 153         case lang_address_statement_enum:
 154           break;
 155
 156         default:
 157           abort ();
 158           break;
 159         }
 160       sprev = s;
 161     }
 162 }
 163
 164 /* Final emulation specific call.  For the PA we use this opportunity
 165    to build linker stubs.  */
 166
 167 static void
 168 hppaelf_finish ()
 169 {
 170   /* Call into the BFD backend to do the real work.  */
 171   if (elf32_hppa_size_stubs (stub_file->the_bfd, output_bfd, &link_info)
 172       == false)
 173     {
 174       einfo ("%X%P: can not size stub section: %E\n");
 175       return;
 176     }
 177
 178   /* If the size of the stub section is nonzero, then we need
 179      to resize the sections, recompute the assignments, and finally
 180      build the stubs.  */
 181   if (bfd_section_size (stub_file->the_bfd, stub_file->the_bfd->sections) != 0)
 182     {
 183       /* Delete all the padding statements, they're no longer valid.  */
 184       hppaelf_delete_padding_statements (stat_ptr->head, &stat_ptr->head);
 185
 186       /* Resize the sections.  */
 187       lang_size_sections (stat_ptr->head, abs_output_section,
 188                           &stat_ptr->head, 0, (bfd_vma) 0, false);
 189
 190       /* Redo special stuff.  */
 191       ldemul_after_allocation ();
 192
 193       /* Do the assignments again.  */
 194       lang_do_assignments (stat_ptr->head,
 195                            abs_output_section,
 196                            (fill_type) 0, (bfd_vma) 0);
 197
 198       /* Now build the linker stubs.  */
 199       if (elf32_hppa_build_stubs (stub_file->the_bfd, &link_info) == false)
 200         {
 201           einfo ("%X%P: can not build stubs: %E\n");
 202           return;
 203         }
 204     }
 205 }
 206
 207 /* The script itself gets inserted here.  */
 208
 209 static char *
 210 hppaelf_get_script(isfile)
 211      int *isfile;
 212 EOF
 213
 214 if test -n "$COMPILE_IN"
 215 then
 216 # Scripts compiled in.
 217
 218 # sed commands to quote an ld script as a C string.
 219 sc="-f stringify.sed"
 220
 221 cat >>e${EMULATION_NAME}.c <<EOF
 222 {
 223   *isfile = 0;
 224
 225   if (link_info.relocateable == true && config.build_constructors == true)
 226     return
 227 EOF
 228 sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
 229 echo '  ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
 230 sed $sc ldscripts/${EMULATION_NAME}.xr                     >> e${EMULATION_NAME}.c
 231 echo '  ; else if (!config.text_read_only) return'         >> e${EMULATION_NAME}.c
 232 sed $sc ldscripts/${EMULATION_NAME}.xbn                    >> e${EMULATION_NAME}.c
 233 echo '  ; else if (!config.magic_demand_paged) return'     >> e${EMULATION_NAME}.c
 234 sed $sc ldscripts/${EMULATION_NAME}.xn                     >> e${EMULATION_NAME}.c
 235 echo '  ; else return'                                     >> e${EMULATION_NAME}.c
 236 sed $sc ldscripts/${EMULATION_NAME}.x                      >> e${EMULATION_NAME}.c
 237 echo '; }'                                                 >> e${EMULATION_NAME}.c
 238
 239 else
 240 # Scripts read from the filesystem.
 241
 242 cat >>e${EMULATION_NAME}.c <<EOF
 243 {
 244   *isfile = 1;
 245
 246   if (link_info.relocateable == true && config.build_constructors == true)
 247     return "ldscripts/${EMULATION_NAME}.xu";
 248   else if (link_info.relocateable == true)
 249     return "ldscripts/${EMULATION_NAME}.xr";
 250   else if (!config.text_read_only)
 251     return "ldscripts/${EMULATION_NAME}.xbn";
 252   else if (!config.magic_demand_paged)
 253     return "ldscripts/${EMULATION_NAME}.xn";
 254   else
 255     return "ldscripts/${EMULATION_NAME}.x";
 256 }
 257 EOF
 258
 259 fi
 260
 261 cat >>e${EMULATION_NAME}.c <<EOF
 262
 263 struct ld_emulation_xfer_struct ld_hppaelf_emulation =
 264 {
 265   hppaelf_before_parse,
 266   syslib_default,
 267   hll_default,
 268   after_parse_default,
 269   after_open_default,
 270   after_allocation_default,
 271   hppaelf_set_output_arch,
 272   ldemul_default_target,
 273   before_allocation_default,
 274   hppaelf_get_script,
 275   "hppaelf",
 276   "elf32-hppa",
 277   hppaelf_finish,
 278   hppaelf_create_output_section_statements,
 279   NULL, /* open dynamic archive */
 280   NULL, /* place orphan */
 281   NULL, /* set symbols */
 282   NULL, /* parse args */
 283   NULL, /* unrecognized file */
 284   NULL, /* list options */
 285   NULL  /* recognized file */
 286 };
 287 EOF