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${EMULATION_NAME}_after_open ();
  64 }
  65
  66 static void
  67 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
  68 {
  69   if (statement->header.type == lang_input_section_enum
  70       && !statement->input_section.ifile->just_syms_flag
  71       && (statement->input_section.section->flags & SEC_EXCLUDE) == 0)
  72     {
  73       asection *i = statement->input_section.section;
  74       asection *output_section = i->output_section;
  75
  76       ASSERT (output_section->owner == output_bfd);
  77
  78       if ((output_section->flags & SEC_HAS_CONTENTS) != 0
  79           && (i->flags & SEC_NEVER_LOAD) == 0
  80           && ! i->owner->output_has_begun)
  81         {
  82           bfd_for_interwork = i->owner;
  83           bfd_for_interwork->output_has_begun = TRUE;
  84         }
  85     }
  86 }
  87
  88 static void
  89 arm_elf_before_allocation (void)
  90 {
  91   bfd *tem;
  92
  93   /* Call the standard elf routine.  */
  94   gld${EMULATION_NAME}_before_allocation ();
  95
  96   if (link_info.input_bfds != NULL)
  97     {
  98       /* The interworking bfd must be the last one in the link.  */
  99       bfd_for_interwork = NULL;
 100       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 101         tem->output_has_begun = FALSE;
 102
 103       lang_for_each_statement (arm_elf_set_bfd_for_interworking);
 104       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 105         tem->output_has_begun = FALSE;
 106
 107       /* If bfd_for_interwork is NULL, then there are no loadable sections
 108          with real contents to be linked, so we are not going to have to
 109          create any interworking stubs, so it is OK not to call
 110          bfd_elf32_arm_get_bfd_for_interworking.  */
 111       if (bfd_for_interwork != NULL)
 112         bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
 113     }
 114   /* We should be able to set the size of the interworking stub section.  */
 115
 116   /* Here we rummage through the found bfds to collect glue information.  */
 117   /* FIXME: should this be based on a command line option? krk@cygnus.com  */
 118   {
 119     LANG_FOR_EACH_INPUT_STATEMENT (is)
 120       {
 121         if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
 122                                                       no_pipeline_knowledge,
 123                                                       byteswap_code))
 124           {
 125             /* xgettext:c-format */
 126             einfo (_("Errors encountered processing file %s"), is->filename);
 127           }
 128       }
 129   }
 130
 131   /* We have seen it all. Allocate it, and carry on.  */
 132   bfd_elf32_arm_allocate_interworking_sections (& link_info);
 133 }
 134
 135 static void
 136 arm_elf_finish (void)
 137 {
 138   struct bfd_link_hash_entry * h;
 139
 140   /* Call the elf32.em routine.  */
 141   gld${EMULATION_NAME}_finish ();
 142
 143   if (thumb_entry_symbol == NULL)
 144     return;
 145
 146   h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
 147                             FALSE, FALSE, TRUE);
 148
 149   if (h != (struct bfd_link_hash_entry *) NULL
 150       && (h->type == bfd_link_hash_defined
 151           || h->type == bfd_link_hash_defweak)
 152       && h->u.def.section->output_section != NULL)
 153     {
 154       static char buffer[32];
 155       bfd_vma val;
 156
 157       /* Special procesing is required for a Thumb entry symbol.  The
 158          bottom bit of its address must be set.  */
 159       val = (h->u.def.value
 160              + bfd_get_section_vma (output_bfd,
 161                                     h->u.def.section->output_section)
 162              + h->u.def.section->output_offset);
 163
 164       val |= 1;
 165
 166       /* Now convert this value into a string and store it in entry_symbol
 167          where the lang_finish() function will pick it up.  */
 168       buffer[0] = '0';
 169       buffer[1] = 'x';
 170
 171       sprintf_vma (buffer + 2, val);
 172
 173       if (entry_symbol.name != NULL && entry_from_cmdline)
 174         einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
 175                thumb_entry_symbol, entry_symbol.name);
 176       entry_symbol.name = buffer;
 177     }
 178   else
 179     einfo (_("%P: warning: connot find thumb start symbol %s\n"),
 180            thumb_entry_symbol);
 181 }
 182
 183 EOF
 184
 185 # Define some shell vars to insert bits of code into the standard elf
 186 # parse_args and list_options functions.
 187 #
 188 PARSE_AND_LIST_PROLOGUE='
 189 #define OPTION_THUMB_ENTRY              301
 190 #define OPTION_BE8                      302
 191 '
 192
 193 PARSE_AND_LIST_SHORTOPTS=p
 194
 195 PARSE_AND_LIST_LONGOPTS='
 196   { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
 197   { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
 198   { "be8", no_argument, NULL, OPTION_BE8},
 199 '
 200
 201 PARSE_AND_LIST_OPTIONS='
 202   fprintf (file, _("  -p --no-pipeline-knowledge  Stop the linker knowing about the pipeline length\n"));
 203   fprintf (file, _("     --thumb-entry=<sym>      Set the entry point to be Thumb symbol <sym>\n"));
 204   fprintf (file, _("     --be8                    Oputput BE8 format image\n"));
 205 '
 206
 207 PARSE_AND_LIST_ARGS_CASES='
 208     case '\'p\'':
 209       no_pipeline_knowledge = 1;
 210       break;
 211
 212     case OPTION_THUMB_ENTRY:
 213       thumb_entry_symbol = optarg;
 214       break;
 215
 216     case OPTION_BE8:
 217       byteswap_code = 1;
 218       break;
 219 '
 220
 221 # We have our own after_open and before_allocation functions, but they call
 222 # the standard routines, so give them a different name.
 223 LDEMUL_AFTER_OPEN=arm_elf_after_open
 224 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
 225
 226 # Replace the elf before_parse function with our own.
 227 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
 228
 229 # Call the extra arm-elf function
 230 LDEMUL_FINISH=arm_elf_finish