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 test -z $TARGET2_TYPE && TARGET2_TYPE="rel"
  26 cat >>e${EMULATION_NAME}.c <<EOF
  27
  28 static int no_pipeline_knowledge = 0;
  29 static char *thumb_entry_symbol = NULL;
  30 static bfd *bfd_for_interwork;
  31 static int byteswap_code = 0;
  32 static int target1_is_rel = 0${TARGET1_IS_REL};
  33 static char *target2_type = "${TARGET2_TYPE}";
  34
  35 static void
  36 gld${EMULATION_NAME}_before_parse (void)
  37 {
  38 #ifndef TARGET_                 /* I.e., if not generic.  */
  39   ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
  40 #endif /* not TARGET_ */
  41   config.dynamic_link = ${DYNAMIC_LINK-TRUE};
  42   config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
  43 }
  44
  45 static void
  46 arm_elf_after_open (void)
  47 {
  48   if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
  49     {
  50       /* The arm backend needs special fields in the output hash structure.
  51          These will only be created if the output format is an arm format,
  52          hence we do not support linking and changing output formats at the
  53          same time.  Use a link followed by objcopy to change output formats.  */
  54       einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
  55       return;
  56     }
  57
  58   {
  59     LANG_FOR_EACH_INPUT_STATEMENT (is)
  60       {
  61         bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
  62       }
  63   }
  64
  65   /* Call the standard elf routine.  */
  66   gld${EMULATION_NAME}_after_open ();
  67 }
  68
  69 static void
  70 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
  71 {
  72   if (statement->header.type == lang_input_section_enum
  73       && !statement->input_section.ifile->just_syms_flag
  74       && (statement->input_section.section->flags & SEC_EXCLUDE) == 0)
  75     {
  76       asection *i = statement->input_section.section;
  77       asection *output_section = i->output_section;
  78
  79       ASSERT (output_section->owner == output_bfd);
  80
  81       /* Don't attach the interworking stubs to a dynamic object, to
  82          an empty section, etc.  */
  83       if ((output_section->flags & SEC_HAS_CONTENTS) != 0
  84           && (i->flags & SEC_NEVER_LOAD) == 0
  85           && ! (i->owner->flags & DYNAMIC)
  86           && ! i->owner->output_has_begun)
  87         {
  88           bfd_for_interwork = i->owner;
  89           bfd_for_interwork->output_has_begun = TRUE;
  90         }
  91     }
  92 }
  93
  94 static void
  95 arm_elf_before_allocation (void)
  96 {
  97   bfd *tem;
  98
  99   /* Call the standard elf routine.  */
 100   gld${EMULATION_NAME}_before_allocation ();
 101
 102   if (link_info.input_bfds != NULL)
 103     {
 104       /* The interworking bfd must be the last one in the link.  */
 105       bfd_for_interwork = NULL;
 106       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 107         tem->output_has_begun = FALSE;
 108
 109       lang_for_each_statement (arm_elf_set_bfd_for_interworking);
 110       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 111         tem->output_has_begun = FALSE;
 112
 113       /* If bfd_for_interwork is NULL, then there are no loadable sections
 114          with real contents to be linked, so we are not going to have to
 115          create any interworking stubs, so it is OK not to call
 116          bfd_elf32_arm_get_bfd_for_interworking.  */
 117       if (bfd_for_interwork != NULL)
 118         bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
 119     }
 120   /* We should be able to set the size of the interworking stub section.  */
 121
 122   /* Here we rummage through the found bfds to collect glue information.  */
 123   /* FIXME: should this be based on a command line option? krk@cygnus.com  */
 124   {
 125     LANG_FOR_EACH_INPUT_STATEMENT (is)
 126       {
 127         if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
 128                                                       no_pipeline_knowledge,
 129                                                       byteswap_code))
 130           {
 131             /* xgettext:c-format */
 132             einfo (_("Errors encountered processing file %s"), is->filename);
 133           }
 134       }
 135   }
 136
 137   /* We have seen it all. Allocate it, and carry on.  */
 138   bfd_elf32_arm_allocate_interworking_sections (& link_info);
 139 }
 140
 141 static void
 142 arm_elf_finish (void)
 143 {
 144   struct bfd_link_hash_entry * h;
 145
 146   /* Call the elf32.em routine.  */
 147   gld${EMULATION_NAME}_finish ();
 148
 149   if (thumb_entry_symbol == NULL)
 150     return;
 151
 152   h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
 153                             FALSE, FALSE, TRUE);
 154
 155   if (h != (struct bfd_link_hash_entry *) NULL
 156       && (h->type == bfd_link_hash_defined
 157           || h->type == bfd_link_hash_defweak)
 158       && h->u.def.section->output_section != NULL)
 159     {
 160       static char buffer[32];
 161       bfd_vma val;
 162
 163       /* Special procesing is required for a Thumb entry symbol.  The
 164          bottom bit of its address must be set.  */
 165       val = (h->u.def.value
 166              + bfd_get_section_vma (output_bfd,
 167                                     h->u.def.section->output_section)
 168              + h->u.def.section->output_offset);
 169
 170       val |= 1;
 171
 172       /* Now convert this value into a string and store it in entry_symbol
 173          where the lang_finish() function will pick it up.  */
 174       buffer[0] = '0';
 175       buffer[1] = 'x';
 176
 177       sprintf_vma (buffer + 2, val);
 178
 179       if (entry_symbol.name != NULL && entry_from_cmdline)
 180         einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
 181                thumb_entry_symbol, entry_symbol.name);
 182       entry_symbol.name = buffer;
 183     }
 184   else
 185     einfo (_("%P: warning: connot find thumb start symbol %s\n"),
 186            thumb_entry_symbol);
 187 }
 188
 189 /* This is a convenitent point to tell BFD about target specific flags.
 190    After the output has been created, but before inputs are read.  */
 191 static void
 192 arm_elf_create_output_section_statements (void)
 193 {
 194   bfd_elf32_arm_set_target_relocs (&link_info, target1_is_rel, target2_type);
 195 }
 196
 197 EOF
 198
 199 # Define some shell vars to insert bits of code into the standard elf
 200 # parse_args and list_options functions.
 201 #
 202 PARSE_AND_LIST_PROLOGUE='
 203 #define OPTION_THUMB_ENTRY              301
 204 #define OPTION_BE8                      302
 205 #define OPTION_TARGET1_REL              303
 206 #define OPTION_TARGET1_ABS              304
 207 #define OPTION_TARGET2                  305
 208 '
 209
 210 PARSE_AND_LIST_SHORTOPTS=p
 211
 212 PARSE_AND_LIST_LONGOPTS='
 213   { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
 214   { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
 215   { "be8", no_argument, NULL, OPTION_BE8},
 216   { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
 217   { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
 218   { "target2", required_argument, NULL, OPTION_TARGET2},
 219 '
 220
 221 PARSE_AND_LIST_OPTIONS='
 222   fprintf (file, _("  -p --no-pipeline-knowledge  Stop the linker knowing about the pipeline length\n"));
 223   fprintf (file, _("     --thumb-entry=<sym>      Set the entry point to be Thumb symbol <sym>\n"));
 224   fprintf (file, _("     --be8                    Oputput BE8 format image\n"));
 225   fprintf (file, _("     --target1=rel            Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
 226   fprintf (file, _("     --target1=abs            Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
 227   fprintf (file, _("     --target2=<type>         Specify definition of R_ARM_TARGET2\n"));
 228 '
 229
 230 PARSE_AND_LIST_ARGS_CASES='
 231     case '\'p\'':
 232       no_pipeline_knowledge = 1;
 233       break;
 234
 235     case OPTION_THUMB_ENTRY:
 236       thumb_entry_symbol = optarg;
 237       break;
 238
 239     case OPTION_BE8:
 240       byteswap_code = 1;
 241       break;
 242
 243     case OPTION_TARGET1_REL:
 244       target1_is_rel = 1;
 245       break;
 246
 247     case OPTION_TARGET1_ABS:
 248       target1_is_rel = 0;
 249       break;
 250
 251     case OPTION_TARGET2:
 252       target2_type = optarg;
 253       break;
 254 '
 255
 256 # We have our own after_open and before_allocation functions, but they call
 257 # the standard routines, so give them a different name.
 258 LDEMUL_AFTER_OPEN=arm_elf_after_open
 259 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
 260 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
 261
 262 # Replace the elf before_parse function with our own.
 263 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
 264
 265 # Call the extra arm-elf function
 266 LDEMUL_FINISH=arm_elf_finish