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 char *thumb_entry_symbol = NULL;
  29 static bfd *bfd_for_interwork;
  30 static int byteswap_code = 0;
  31 static int target1_is_rel = 0${TARGET1_IS_REL};
  32 static char *target2_type = "${TARGET2_TYPE}";
  33
  34 static void
  35 gld${EMULATION_NAME}_before_parse (void)
  36 {
  37 #ifndef TARGET_                 /* I.e., if not generic.  */
  38   ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
  39 #endif /* not TARGET_ */
  40   config.dynamic_link = ${DYNAMIC_LINK-TRUE};
  41   config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
  42 }
  43
  44 static void
  45 arm_elf_after_open (void)
  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${EMULATION_NAME}_after_open ();
  66 }
  67
  68 static void
  69 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
  70 {
  71   if (statement->header.type == lang_input_section_enum
  72       && !statement->input_section.ifile->just_syms_flag
  73       && (statement->input_section.section->flags & SEC_EXCLUDE) == 0)
  74     {
  75       asection *i = statement->input_section.section;
  76       asection *output_section = i->output_section;
  77
  78       ASSERT (output_section->owner == output_bfd);
  79
  80       /* Don't attach the interworking stubs to a dynamic object, to
  81          an empty section, etc.  */
  82       if ((output_section->flags & SEC_HAS_CONTENTS) != 0
  83           && (i->flags & SEC_NEVER_LOAD) == 0
  84           && ! (i->owner->flags & DYNAMIC)
  85           && ! i->owner->output_has_begun)
  86         {
  87           bfd_for_interwork = i->owner;
  88           bfd_for_interwork->output_has_begun = TRUE;
  89         }
  90     }
  91 }
  92
  93 static void
  94 arm_elf_before_allocation (void)
  95 {
  96   bfd *tem;
  97
  98   /* Call the standard elf routine.  */
  99   gld${EMULATION_NAME}_before_allocation ();
 100
 101   if (link_info.input_bfds != NULL)
 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       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 110         tem->output_has_begun = FALSE;
 111
 112       /* If bfd_for_interwork is NULL, then there are no loadable sections
 113          with real contents to be linked, so we are not going to have to
 114          create any interworking stubs, so it is OK not to call
 115          bfd_elf32_arm_get_bfd_for_interworking.  */
 116       if (bfd_for_interwork != NULL)
 117         bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
 118     }
 119   /* We should be able to set the size of the interworking stub section.  */
 120
 121   /* Here we rummage through the found bfds to collect glue information.  */
 122   /* FIXME: should this be based on a command line option? krk@cygnus.com  */
 123   {
 124     LANG_FOR_EACH_INPUT_STATEMENT (is)
 125       {
 126         if (!bfd_elf32_arm_process_before_allocation (is->the_bfd, & link_info,
 127                                                       byteswap_code))
 128           {
 129             /* xgettext:c-format */
 130             einfo (_("Errors encountered processing file %s"), is->filename);
 131           }
 132       }
 133   }
 134
 135   /* We have seen it all. Allocate it, and carry on.  */
 136   bfd_elf32_arm_allocate_interworking_sections (& link_info);
 137 }
 138
 139 static void
 140 arm_elf_finish (void)
 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 /* This is a convenitent point to tell BFD about target specific flags.
 188    After the output has been created, but before inputs are read.  */
 189 static void
 190 arm_elf_create_output_section_statements (void)
 191 {
 192   bfd_elf32_arm_set_target_relocs (&link_info, target1_is_rel, target2_type);
 193 }
 194
 195 EOF
 196
 197 # Define some shell vars to insert bits of code into the standard elf
 198 # parse_args and list_options functions.
 199 #
 200 PARSE_AND_LIST_PROLOGUE='
 201 #define OPTION_THUMB_ENTRY              301
 202 #define OPTION_BE8                      302
 203 #define OPTION_TARGET1_REL              303
 204 #define OPTION_TARGET1_ABS              304
 205 #define OPTION_TARGET2                  305
 206 '
 207
 208 PARSE_AND_LIST_SHORTOPTS=p
 209
 210 PARSE_AND_LIST_LONGOPTS='
 211   { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
 212   { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
 213   { "be8", no_argument, NULL, OPTION_BE8},
 214   { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
 215   { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
 216   { "target2", required_argument, NULL, OPTION_TARGET2},
 217 '
 218
 219 PARSE_AND_LIST_OPTIONS='
 220   fprintf (file, _("     --thumb-entry=<sym>      Set the entry point to be Thumb symbol <sym>\n"));
 221   fprintf (file, _("     --be8                    Oputput BE8 format image\n"));
 222   fprintf (file, _("     --target1=rel            Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
 223   fprintf (file, _("     --target1=abs            Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
 224   fprintf (file, _("     --target2=<type>         Specify definition of R_ARM_TARGET2\n"));
 225 '
 226
 227 PARSE_AND_LIST_ARGS_CASES='
 228     case '\'p\'':
 229       /* Only here for backwards compatibility.  */
 230       break;
 231
 232     case OPTION_THUMB_ENTRY:
 233       thumb_entry_symbol = optarg;
 234       break;
 235
 236     case OPTION_BE8:
 237       byteswap_code = 1;
 238       break;
 239
 240     case OPTION_TARGET1_REL:
 241       target1_is_rel = 1;
 242       break;
 243
 244     case OPTION_TARGET1_ABS:
 245       target1_is_rel = 0;
 246       break;
 247
 248     case OPTION_TARGET2:
 249       target2_type = optarg;
 250       break;
 251 '
 252
 253 # We have our own after_open and before_allocation functions, but they call
 254 # the standard routines, so give them a different name.
 255 LDEMUL_AFTER_OPEN=arm_elf_after_open
 256 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
 257 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
 258
 259 # Replace the elf before_parse function with our own.
 260 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
 261
 262 # Call the extra arm-elf function
 263 LDEMUL_FINISH=arm_elf_finish