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${EMULATION_NAME}_after_open ();
  66 }
  67
  68 static void arm_elf_set_bfd_for_interworking
  69   PARAMS ((lang_statement_union_type *));
  70
  71 static void
  72 arm_elf_set_bfd_for_interworking (statement)
  73      lang_statement_union_type *statement;
  74 {
  75   if (statement->header.type == lang_input_section_enum
  76       && statement->input_section.ifile->just_syms_flag == false)
  77     {
  78       asection *i = statement->input_section.section;
  79       asection *output_section = i->output_section;
  80
  81       ASSERT (output_section->owner == output_bfd);
  82
  83       if ((output_section->flags & SEC_HAS_CONTENTS) != 0
  84           && (i->flags & SEC_NEVER_LOAD) == 0
  85           && ! i->owner->output_has_begun)
  86         {
  87           bfd_for_interwork = i->owner;
  88           bfd_for_interwork->output_has_begun = true;
  89         }
  90     }
  91 }
  92
  93 static void arm_elf_before_allocation PARAMS ((void));
  94
  95 static void
  96 arm_elf_before_allocation ()
  97 {
  98   bfd *tem;
  99
 100   /* Call the standard elf routine.  */
 101   gld${EMULATION_NAME}_before_allocation ();
 102
 103   /* The interworking bfd must be the last one in the link.  */
 104   bfd_for_interwork = NULL;
 105   for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 106     tem->output_has_begun = false;
 107
 108   lang_for_each_statement (arm_elf_set_bfd_for_interworking);
 109   ASSERT (bfd_for_interwork != NULL);
 110   for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 111     tem->output_has_begun = false;
 112
 113   bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
 114
 115   /* We should be able to set the size of the interworking stub section.  */
 116
 117   /* Here we rummage through the found bfds to collect glue information.  */
 118   /* FIXME: should this be based on a command line option? krk@cygnus.com  */
 119   {
 120     LANG_FOR_EACH_INPUT_STATEMENT (is)
 121       {
 122         if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
 123                                                       no_pipeline_knowledge))
 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 arm_elf_finish PARAMS ((void));
 136
 137 static void
 138 arm_elf_finish ()
 139 {
 140   struct bfd_link_hash_entry * h;
 141
 142   /* Call the elf32.em routine.  */
 143   gld${EMULATION_NAME}_finish ();
 144
 145   if (thumb_entry_symbol == NULL)
 146     return;
 147
 148   h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
 149                             false, false, true);
 150
 151   if (h != (struct bfd_link_hash_entry *) NULL
 152       && (h->type == bfd_link_hash_defined
 153           || h->type == bfd_link_hash_defweak)
 154       && h->u.def.section->output_section != NULL)
 155     {
 156       static char buffer[32];
 157       bfd_vma val;
 158
 159       /* Special procesing is required for a Thumb entry symbol.  The
 160          bottom bit of its address must be set.  */
 161       val = (h->u.def.value
 162              + bfd_get_section_vma (output_bfd,
 163                                     h->u.def.section->output_section)
 164              + h->u.def.section->output_offset);
 165
 166       val |= 1;
 167
 168       /* Now convert this value into a string and store it in entry_symbol
 169          where the lang_finish() function will pick it up.  */
 170       buffer[0] = '0';
 171       buffer[1] = 'x';
 172
 173       sprintf_vma (buffer + 2, val);
 174
 175       if (entry_symbol != NULL && entry_from_cmdline)
 176         einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
 177                thumb_entry_symbol, entry_symbol);
 178       entry_symbol = buffer;
 179     }
 180   else
 181     einfo (_("%P: warning: connot find thumb start symbol %s\n"),
 182            thumb_entry_symbol);
 183 }
 184
 185 EOF
 186
 187 # Define some shell vars to insert bits of code into the standard elf
 188 # parse_args and list_options functions.
 189 #
 190 PARSE_AND_LIST_PROLOGUE='
 191 #define OPTION_THUMB_ENTRY              301
 192 '
 193
 194 # Note we add 'n' to the short option list in order to prevent
 195 # getopt_long_only from thinking that -n is a unique abbreviation
 196 # for --no-pipeline-knowledge.  There is no case to handle 'n' here
 197 # however, so instead it will be passed back to parse_args() in
 198 # lexsup.c where it will be handled.
 199 PARSE_AND_LIST_SHORTOPTS=pn
 200
 201 PARSE_AND_LIST_LONGOPTS='
 202   { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
 203   { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
 204 '
 205
 206 PARSE_AND_LIST_OPTIONS='
 207   fprintf (file, _("  -p --no-pipeline-knowledge  Stop the linker knowing about the pipeline length\n"));
 208   fprintf (file, _("     --thumb-entry=<sym>      Set the entry point to be Thumb symbol <sym>\n"));
 209 '
 210
 211 PARSE_AND_LIST_ARGS_CASES='
 212     case '\'p\'':
 213       no_pipeline_knowledge = 1;
 214       break;
 215
 216     case OPTION_THUMB_ENTRY:
 217       thumb_entry_symbol = optarg;
 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