ld/emultempl/armelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 1991, 1993, 1996, 1997, 1998, 1999, 2000, 2002
   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       ASSERT (bfd_for_interwork != NULL);
 112       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 113         tem->output_has_begun = FALSE;
 114
 115       bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
 116     }
 117   /* We should be able to set the size of the interworking stub section.  */
 118
 119   /* Here we rummage through the found bfds to collect glue information.  */
 120   /* FIXME: should this be based on a command line option? krk@cygnus.com  */
 121   {
 122     LANG_FOR_EACH_INPUT_STATEMENT (is)
 123       {
 124         if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
 125                                                       no_pipeline_knowledge))
 126           {
 127             /* xgettext:c-format */
 128             einfo (_("Errors encountered processing file %s"), is->filename);
 129           }
 130       }
 131   }
 132
 133   /* We have seen it all. Allocate it, and carry on.  */
 134   bfd_elf32_arm_allocate_interworking_sections (& link_info);
 135 }
 136
 137 static void arm_elf_finish PARAMS ((void));
 138
 139 static void
 140 arm_elf_finish ()
 141 {
 142   struct bfd_link_hash_entry * h;
 143
 144   /* Call the elf32.em routine.  */
 145   gld${EMULATION_NAME}_finish ();
 146
 147   if (thumb_entry_symbol == NULL)
 148     return;
 149
 150   h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
 151                             FALSE, FALSE, TRUE);
 152
 153   if (h != (struct bfd_link_hash_entry *) NULL
 154       && (h->type == bfd_link_hash_defined
 155           || h->type == bfd_link_hash_defweak)
 156       && h->u.def.section->output_section != NULL)
 157     {
 158       static char buffer[32];
 159       bfd_vma val;
 160
 161       /* Special procesing is required for a Thumb entry symbol.  The
 162          bottom bit of its address must be set.  */
 163       val = (h->u.def.value
 164              + bfd_get_section_vma (output_bfd,
 165                                     h->u.def.section->output_section)
 166              + h->u.def.section->output_offset);
 167
 168       val |= 1;
 169
 170       /* Now convert this value into a string and store it in entry_symbol
 171          where the lang_finish() function will pick it up.  */
 172       buffer[0] = '0';
 173       buffer[1] = 'x';
 174
 175       sprintf_vma (buffer + 2, val);
 176
 177       if (entry_symbol.name != NULL && entry_from_cmdline)
 178         einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
 179                thumb_entry_symbol, entry_symbol.name);
 180       entry_symbol.name = buffer;
 181     }
 182   else
 183     einfo (_("%P: warning: connot find thumb start symbol %s\n"),
 184            thumb_entry_symbol);
 185 }
 186
 187 EOF
 188
 189 # Define some shell vars to insert bits of code into the standard elf
 190 # parse_args and list_options functions.
 191 #
 192 PARSE_AND_LIST_PROLOGUE='
 193 #define OPTION_THUMB_ENTRY              301
 194 '
 195
 196 # Note we add 'n' to the short option list in order to prevent
 197 # getopt_long_only from thinking that -n is a unique abbreviation
 198 # for --no-pipeline-knowledge.  There is no case to handle 'n' here
 199 # however, so instead it will be passed back to parse_args() in
 200 # lexsup.c where it will be handled.
 201 PARSE_AND_LIST_SHORTOPTS=pn
 202
 203 PARSE_AND_LIST_LONGOPTS='
 204   { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
 205   { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
 206 '
 207
 208 PARSE_AND_LIST_OPTIONS='
 209   fprintf (file, _("  -p --no-pipeline-knowledge  Stop the linker knowing about the pipeline length\n"));
 210   fprintf (file, _("     --thumb-entry=<sym>      Set the entry point to be Thumb symbol <sym>\n"));
 211 '
 212
 213 PARSE_AND_LIST_ARGS_CASES='
 214     case '\'p\'':
 215       no_pipeline_knowledge = 1;
 216       break;
 217
 218     case OPTION_THUMB_ENTRY:
 219       thumb_entry_symbol = optarg;
 220       break;
 221 '
 222
 223 # We have our own after_open and before_allocation functions, but they call
 224 # the standard routines, so give them a different name.
 225 LDEMUL_AFTER_OPEN=arm_elf_after_open
 226 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
 227
 228 # Replace the elf before_parse function with our own.
 229 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
 230
 231 # Call the extra arm-elf function
 232 LDEMUL_FINISH=arm_elf_finish