ld/emultempl/armelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 1991, 1993, 1996, 1997, 1998, 1999, 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 arm-elf
  23 # specific routines.
  24 #
  25 cat >>e${EMULATION_NAME}.c <<EOF
  26
  27 static int no_pipeline_knowledge = 0;
  28 static char *thumb_entry_symbol = NULL;
  29
  30
  31 static void
  32 gld${EMULATION_NAME}_before_parse ()
  33 {
  34 #ifndef TARGET_                 /* I.e., if not generic.  */
  35   ldfile_set_output_arch ("`echo ${ARCH}`");
  36 #endif /* not TARGET_ */
  37   config.dynamic_link = ${DYNAMIC_LINK-true};
  38   config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo true ; else echo false ; fi`;
  39 }
  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         /* The interworking bfd must be the last one to be processed */
  61         if (!is->next)
  62           bfd_elf32_arm_get_bfd_for_interworking (is->the_bfd, & link_info);
  63       }
  64   }
  65
  66   /* Call the standard elf routine.  */
  67   gld${EMULATION_NAME}_after_open ();
  68 }
  69
  70
  71 static void arm_elf_before_allocation PARAMS ((void));
  72
  73 static void
  74 arm_elf_before_allocation ()
  75 {
  76   /* Call the standard elf routine.  */
  77   gld${EMULATION_NAME}_before_allocation ();
  78
  79   /* We should be able to set the size of the interworking stub section */
  80
  81   /* Here we rummage through the found bfds to collect glue information */
  82   /* FIXME: should this be based on a command line option? krk@cygnus.com */
  83   {
  84     LANG_FOR_EACH_INPUT_STATEMENT (is)
  85       {
  86         if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
  87                                                       no_pipeline_knowledge))
  88           {
  89             /* xgettext:c-format */
  90             einfo (_("Errors encountered processing file %s"), is->filename);
  91           }
  92       }
  93   }
  94
  95   /* We have seen it all. Allocate it, and carry on */
  96   bfd_elf32_arm_allocate_interworking_sections (& link_info);
  97 }
  98
  99
 100 static void gld${EMULATION_NAME}_finish PARAMS ((void));
 101
 102 static void
 103 gld${EMULATION_NAME}_finish PARAMS((void))
 104 {
 105   struct bfd_link_hash_entry * h;
 106
 107   if (thumb_entry_symbol == NULL)
 108     return;
 109
 110   h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
 111                             false, false, true);
 112
 113   if (h != (struct bfd_link_hash_entry *) NULL
 114       && (h->type == bfd_link_hash_defined
 115           || h->type == bfd_link_hash_defweak)
 116       && h->u.def.section->output_section != NULL)
 117     {
 118       static char buffer[32];
 119       bfd_vma val;
 120
 121       /* Special procesing is required for a Thumb entry symbol.  The
 122          bottom bit of its address must be set.  */
 123       val = (h->u.def.value
 124              + bfd_get_section_vma (output_bfd,
 125                                     h->u.def.section->output_section)
 126              + h->u.def.section->output_offset);
 127
 128       val |= 1;
 129
 130       /* Now convert this value into a string and store it in entry_symbol
 131          where the lang_finish() function will pick it up.  */
 132       buffer[0] = '0';
 133       buffer[1] = 'x';
 134
 135       sprintf_vma (buffer + 2, val);
 136
 137       if (entry_symbol != NULL && entry_from_cmdline)
 138         einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
 139                thumb_entry_symbol, entry_symbol);
 140       entry_symbol = buffer;
 141     }
 142   else
 143     einfo (_("%P: warning: connot find thumb start symbol %s\n"),
 144            thumb_entry_symbol);
 145 }
 146
 147 EOF
 148
 149 # Define some shell vars to insert bits of code into the standard elf
 150 # parse_args and list_options functions.
 151 #
 152 PARSE_AND_LIST_PROLOGUE='
 153 #define OPTION_THUMB_ENTRY              301
 154 '
 155
 156 PARSE_AND_LIST_SHORTOPTS=p
 157
 158 PARSE_AND_LIST_LONGOPTS='
 159   { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
 160   { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
 161 '
 162
 163 PARSE_AND_LIST_OPTIONS='
 164   fprintf (file, _("  -p --no-pipeline-knowledge  Stop the linker knowing about the pipeline length\n"));
 165   fprintf (file, _("     --thumb-entry=<sym>      Set the entry point to be Thumb symbol <sym>\n"));
 166 '
 167
 168 PARSE_AND_LIST_ARGS_CASES='
 169     case '\'p\'':
 170       no_pipeline_knowledge = 1;
 171       break;
 172
 173     case OPTION_THUMB_ENTRY:
 174       thumb_entry_symbol = optarg;
 175       break;
 176 '
 177
 178 # We have our own after_open and before_allocation functions, but they call
 179 # the standard routines, so give them a different name.
 180 LDEMUL_AFTER_OPEN=arm_elf_after_open
 181 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
 182
 183 # Replace the elf before_parse function with our own.
 184 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
 185
 186 # Call the extra arm-elf function
 187 LDEMUL_FINISH=gld${EMULATION_NAME}_finish