ld/emultempl/armelf.em

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