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 arm_elf_finish PARAMS ((void));
 101
 102 static void
 103 arm_elf_finish ()
 104 {
 105   struct bfd_link_hash_entry * h;
 106
 107   /* Call the elf32.em routine.  */
 108   gld${EMULATION_NAME}_finish ();
 109
 110   if (thumb_entry_symbol == NULL)
 111     return;
 112
 113   h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
 114                             false, false, true);
 115
 116   if (h != (struct bfd_link_hash_entry *) NULL
 117       && (h->type == bfd_link_hash_defined
 118           || h->type == bfd_link_hash_defweak)
 119       && h->u.def.section->output_section != NULL)
 120     {
 121       static char buffer[32];
 122       bfd_vma val;
 123
 124       /* Special procesing is required for a Thumb entry symbol.  The
 125          bottom bit of its address must be set.  */
 126       val = (h->u.def.value
 127              + bfd_get_section_vma (output_bfd,
 128                                     h->u.def.section->output_section)
 129              + h->u.def.section->output_offset);
 130
 131       val |= 1;
 132
 133       /* Now convert this value into a string and store it in entry_symbol
 134          where the lang_finish() function will pick it up.  */
 135       buffer[0] = '0';
 136       buffer[1] = 'x';
 137
 138       sprintf_vma (buffer + 2, val);
 139
 140       if (entry_symbol != NULL && entry_from_cmdline)
 141         einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
 142                thumb_entry_symbol, entry_symbol);
 143       entry_symbol = buffer;
 144     }
 145   else
 146     einfo (_("%P: warning: connot find thumb start symbol %s\n"),
 147            thumb_entry_symbol);
 148 }
 149
 150 EOF
 151
 152 # Define some shell vars to insert bits of code into the standard elf
 153 # parse_args and list_options functions.
 154 #
 155 PARSE_AND_LIST_PROLOGUE='
 156 #define OPTION_THUMB_ENTRY              301
 157 '
 158
 159 PARSE_AND_LIST_SHORTOPTS=p
 160
 161 PARSE_AND_LIST_LONGOPTS='
 162   { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
 163   { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
 164 '
 165
 166 PARSE_AND_LIST_OPTIONS='
 167   fprintf (file, _("  -p --no-pipeline-knowledge  Stop the linker knowing about the pipeline length\n"));
 168   fprintf (file, _("     --thumb-entry=<sym>      Set the entry point to be Thumb symbol <sym>\n"));
 169 '
 170
 171 PARSE_AND_LIST_ARGS_CASES='
 172     case '\'p\'':
 173       no_pipeline_knowledge = 1;
 174       break;
 175
 176     case OPTION_THUMB_ENTRY:
 177       thumb_entry_symbol = optarg;
 178       break;
 179 '
 180
 181 # We have our own after_open and before_allocation functions, but they call
 182 # the standard routines, so give them a different name.
 183 LDEMUL_AFTER_OPEN=arm_elf_after_open
 184 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
 185
 186 # Replace the elf before_parse function with our own.
 187 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
 188
 189 # Call the extra arm-elf function
 190 LDEMUL_FINISH=arm_elf_finish