ld/emultempl/armelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 1991, 1993, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004
   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 arm-elf
  23 # specific routines.
  24 #
  25 cat >>e${EMULATION_NAME}.c <<EOF
  26
  27 static int no_pipeline_knowledge = 0;
  28 static char *thumb_entry_symbol = NULL;
  29 static bfd *bfd_for_interwork;
  30 static int byteswap_code = 0;
  31
  32 static void
  33 gld${EMULATION_NAME}_before_parse (void)
  34 {
  35 #ifndef TARGET_                 /* I.e., if not generic.  */
  36   ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
  37 #endif /* not TARGET_ */
  38   config.dynamic_link = ${DYNAMIC_LINK-TRUE};
  39   config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
  40 }
  41
  42 static void
  43 arm_elf_after_open (void)
  44 {
  45   if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
  46     {
  47       /* The arm backend needs special fields in the output hash structure.
  48          These will only be created if the output format is an arm format,
  49          hence we do not support linking and changing output formats at the
  50          same time.  Use a link followed by objcopy to change output formats.  */
  51       einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
  52       return;
  53     }
  54
  55   {
  56     LANG_FOR_EACH_INPUT_STATEMENT (is)
  57       {
  58         bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
  59       }
  60   }
  61
  62   /* Call the standard elf routine.  */
  63   gld${EMULATION_NAME}_after_open ();
  64 }
  65
  66 static void
  67 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
  68 {
  69   if (statement->header.type == lang_input_section_enum
  70       && !statement->input_section.ifile->just_syms_flag)
  71     {
  72       asection *i = statement->input_section.section;
  73       asection *output_section = i->output_section;
  74
  75       ASSERT (output_section->owner == output_bfd);
  76
  77       if ((output_section->flags & SEC_HAS_CONTENTS) != 0
  78           && (i->flags & SEC_NEVER_LOAD) == 0
  79           && ! i->owner->output_has_begun)
  80         {
  81           bfd_for_interwork = i->owner;
  82           bfd_for_interwork->output_has_begun = TRUE;
  83         }
  84     }
  85 }
  86
  87 static void
  88 arm_elf_before_allocation (void)
  89 {
  90   bfd *tem;
  91
  92   /* Call the standard elf routine.  */
  93   gld${EMULATION_NAME}_before_allocation ();
  94
  95   if (link_info.input_bfds != NULL)
  96     {
  97       /* The interworking bfd must be the last one in the link.  */
  98       bfd_for_interwork = NULL;
  99       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 100         tem->output_has_begun = FALSE;
 101
 102       lang_for_each_statement (arm_elf_set_bfd_for_interworking);
 103       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 104         tem->output_has_begun = FALSE;
 105
 106       /* If bfd_for_interwork is NULL, then there are no loadable sections
 107          with real contents to be linked, so we are not going to have to
 108          create any interworking stubs, so it is OK not to call
 109          bfd_elf32_arm_get_bfd_for_interworking.  */
 110       if (bfd_for_interwork != NULL)
 111         bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
 112     }
 113   /* We should be able to set the size of the interworking stub section.  */
 114
 115   /* Here we rummage through the found bfds to collect glue information.  */
 116   /* FIXME: should this be based on a command line option? krk@cygnus.com  */
 117   {
 118     LANG_FOR_EACH_INPUT_STATEMENT (is)
 119       {
 120         if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
 121                                                       no_pipeline_knowledge,
 122                                                       byteswap_code))
 123           {
 124             /* xgettext:c-format */
 125             einfo (_("Errors encountered processing file %s"), is->filename);
 126           }
 127       }
 128   }
 129
 130   /* We have seen it all. Allocate it, and carry on.  */
 131   bfd_elf32_arm_allocate_interworking_sections (& link_info);
 132 }
 133
 134 static void
 135 arm_elf_finish (void)
 136 {
 137   struct bfd_link_hash_entry * h;
 138
 139   /* Call the elf32.em routine.  */
 140   gld${EMULATION_NAME}_finish ();
 141
 142   if (thumb_entry_symbol == NULL)
 143     return;
 144
 145   h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
 146                             FALSE, FALSE, TRUE);
 147
 148   if (h != (struct bfd_link_hash_entry *) NULL
 149       && (h->type == bfd_link_hash_defined
 150           || h->type == bfd_link_hash_defweak)
 151       && h->u.def.section->output_section != NULL)
 152     {
 153       static char buffer[32];
 154       bfd_vma val;
 155
 156       /* Special procesing is required for a Thumb entry symbol.  The
 157          bottom bit of its address must be set.  */
 158       val = (h->u.def.value
 159              + bfd_get_section_vma (output_bfd,
 160                                     h->u.def.section->output_section)
 161              + h->u.def.section->output_offset);
 162
 163       val |= 1;
 164
 165       /* Now convert this value into a string and store it in entry_symbol
 166          where the lang_finish() function will pick it up.  */
 167       buffer[0] = '0';
 168       buffer[1] = 'x';
 169
 170       sprintf_vma (buffer + 2, val);
 171
 172       if (entry_symbol.name != NULL && entry_from_cmdline)
 173         einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
 174                thumb_entry_symbol, entry_symbol.name);
 175       entry_symbol.name = buffer;
 176     }
 177   else
 178     einfo (_("%P: warning: connot find thumb start symbol %s\n"),
 179            thumb_entry_symbol);
 180 }
 181
 182 EOF
 183
 184 # Define some shell vars to insert bits of code into the standard elf
 185 # parse_args and list_options functions.
 186 #
 187 PARSE_AND_LIST_PROLOGUE='
 188 #define OPTION_THUMB_ENTRY              301
 189 #define OPTION_BE8                      302
 190 '
 191
 192 PARSE_AND_LIST_SHORTOPTS=p
 193
 194 PARSE_AND_LIST_LONGOPTS='
 195   { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
 196   { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
 197   { "be8", no_argument, NULL, OPTION_BE8},
 198 '
 199
 200 PARSE_AND_LIST_OPTIONS='
 201   fprintf (file, _("  -p --no-pipeline-knowledge  Stop the linker knowing about the pipeline length\n"));
 202   fprintf (file, _("     --thumb-entry=<sym>      Set the entry point to be Thumb symbol <sym>\n"));
 203   fprintf (file, _("     --be8                    Oputput BE8 format image\n"));
 204 '
 205
 206 PARSE_AND_LIST_ARGS_CASES='
 207     case '\'p\'':
 208       no_pipeline_knowledge = 1;
 209       break;
 210
 211     case OPTION_THUMB_ENTRY:
 212       thumb_entry_symbol = optarg;
 213       break;
 214
 215     case OPTION_BE8:
 216       byteswap_code = 1;
 217       break;
 218 '
 219
 220 # We have our own after_open and before_allocation functions, but they call
 221 # the standard routines, so give them a different name.
 222 LDEMUL_AFTER_OPEN=arm_elf_after_open
 223 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
 224
 225 # Replace the elf before_parse function with our own.
 226 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
 227
 228 # Call the extra arm-elf function
 229 LDEMUL_FINISH=arm_elf_finish