ld/emultempl/armelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 1991, 1993, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   3 #   2004, 2005
   4 #   Free Software Foundation, Inc.
   5 #
   6 # This file is part of GLD, the Gnu Linker.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program; if not, write to the Free Software
  20 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  21 #
  22
  23 # This file is sourced from elf32.em, and defines extra arm-elf
  24 # specific routines.
  25 #
  26 test -z "$TARGET2_TYPE" && TARGET2_TYPE="rel"
  27 cat >>e${EMULATION_NAME}.c <<EOF
  28
  29 #include "elf/arm.h"
  30
  31 static char *thumb_entry_symbol = NULL;
  32 static bfd *bfd_for_interwork;
  33 static int byteswap_code = 0;
  34 static int target1_is_rel = 0${TARGET1_IS_REL};
  35 static char *target2_type = "${TARGET2_TYPE}";
  36 static int fix_v4bx = 0;
  37 static int use_blx = 0;
  38 static bfd_arm_vfp11_fix vfp11_denorm_fix = BFD_ARM_VFP11_FIX_DEFAULT;
  39
  40 static void
  41 gld${EMULATION_NAME}_before_parse (void)
  42 {
  43 #ifndef TARGET_                 /* I.e., if not generic.  */
  44   ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
  45 #endif /* not TARGET_ */
  46   config.dynamic_link = ${DYNAMIC_LINK-TRUE};
  47   config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
  48 }
  49
  50 static void
  51 arm_elf_after_open (void)
  52 {
  53   if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
  54     {
  55       /* The arm backend needs special fields in the output hash structure.
  56          These will only be created if the output format is an arm format,
  57          hence we do not support linking and changing output formats at the
  58          same time.  Use a link followed by objcopy to change output formats.  */
  59       einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
  60       return;
  61     }
  62
  63   {
  64     LANG_FOR_EACH_INPUT_STATEMENT (is)
  65       {
  66         bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
  67       }
  68   }
  69
  70   /* Call the standard elf routine.  */
  71   gld${EMULATION_NAME}_after_open ();
  72 }
  73
  74 static void
  75 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
  76 {
  77   if (statement->header.type == lang_input_section_enum)
  78     {
  79       asection *i = statement->input_section.section;
  80
  81       if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
  82           && (i->flags & SEC_EXCLUDE) == 0)
  83         {
  84           asection *output_section = i->output_section;
  85
  86           ASSERT (output_section->owner == output_bfd);
  87
  88           /* Don't attach the interworking stubs to a dynamic object, to
  89              an empty section, etc.  */
  90           if ((output_section->flags & SEC_HAS_CONTENTS) != 0
  91               && (i->flags & SEC_NEVER_LOAD) == 0
  92               && ! (i->owner->flags & DYNAMIC)
  93               && ! i->owner->output_has_begun)
  94             {
  95               bfd_for_interwork = i->owner;
  96               bfd_for_interwork->output_has_begun = TRUE;
  97             }
  98         }
  99     }
 100 }
 101
 102 static void
 103 arm_elf_before_allocation (void)
 104 {
 105   bfd *tem;
 106
 107   if (link_info.input_bfds != NULL)
 108     {
 109       /* The interworking bfd must be the last one in the link.  */
 110       bfd_for_interwork = NULL;
 111       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 112         tem->output_has_begun = FALSE;
 113
 114       lang_for_each_statement (arm_elf_set_bfd_for_interworking);
 115       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 116         tem->output_has_begun = FALSE;
 117
 118       /* If bfd_for_interwork is NULL, then there are no loadable sections
 119          with real contents to be linked, so we are not going to have to
 120          create any interworking stubs, so it is OK not to call
 121          bfd_elf32_arm_get_bfd_for_interworking.  */
 122       if (bfd_for_interwork != NULL)
 123         bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
 124     }
 125
 126   bfd_elf32_arm_set_byteswap_code (&link_info, byteswap_code);
 127
 128   /* Choose type of VFP11 erratum fix, or warn if specified fix is unnecessary
 129      due to architecture version.  */
 130   bfd_elf32_arm_set_vfp11_fix (output_bfd, &link_info);
 131
 132   /* We should be able to set the size of the interworking stub section.  We
 133      can't do it until later if we have dynamic sections, though.  */
 134   if (! elf_hash_table (&link_info)->dynamic_sections_created)
 135     {
 136       /* Here we rummage through the found bfds to collect glue information.  */
 137       LANG_FOR_EACH_INPUT_STATEMENT (is)
 138         {
 139           /* Initialise mapping tables for code/data.  */
 140           bfd_elf32_arm_init_maps (is->the_bfd);
 141
 142           if (!bfd_elf32_arm_process_before_allocation (is->the_bfd,
 143                                                         &link_info)
 144               || !bfd_elf32_arm_vfp11_erratum_scan (is->the_bfd, &link_info))
 145             /* xgettext:c-format */
 146             einfo (_("Errors encountered processing file %s"), is->filename);
 147         }
 148     }
 149
 150   /* Call the standard elf routine.  */
 151   gld${EMULATION_NAME}_before_allocation ();
 152
 153   /* We have seen it all. Allocate it, and carry on.  */
 154   bfd_elf32_arm_allocate_interworking_sections (& link_info);
 155 }
 156
 157 static void
 158 arm_elf_after_allocation (void)
 159 {
 160   /* Call the standard elf routine.  */
 161   after_allocation_default ();
 162
 163   {
 164     LANG_FOR_EACH_INPUT_STATEMENT (is)
 165       {
 166         /* Figure out where VFP11 erratum veneers (and the labels returning
 167            from same) have been placed.  */
 168         bfd_elf32_arm_vfp11_fix_veneer_locations (is->the_bfd, &link_info);
 169       }
 170   }
 171 }
 172
 173 static void
 174 arm_elf_finish (void)
 175 {
 176   struct bfd_link_hash_entry * h;
 177
 178   /* Call the elf32.em routine.  */
 179   gld${EMULATION_NAME}_finish ();
 180
 181   if (thumb_entry_symbol)
 182     {
 183       h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
 184                                 FALSE, FALSE, TRUE);
 185     }
 186   else
 187     {
 188       struct elf_link_hash_entry * eh;
 189
 190       if (!entry_symbol.name)
 191         return;
 192
 193       h = bfd_link_hash_lookup (link_info.hash, entry_symbol.name,
 194                                 FALSE, FALSE, TRUE);
 195       eh = (struct elf_link_hash_entry *)h;
 196       if (!h || ELF_ST_TYPE(eh->type) != STT_ARM_TFUNC)
 197         return;
 198     }
 199
 200
 201   if (h != (struct bfd_link_hash_entry *) NULL
 202       && (h->type == bfd_link_hash_defined
 203           || h->type == bfd_link_hash_defweak)
 204       && h->u.def.section->output_section != NULL)
 205     {
 206       static char buffer[32];
 207       bfd_vma val;
 208
 209       /* Special procesing is required for a Thumb entry symbol.  The
 210          bottom bit of its address must be set.  */
 211       val = (h->u.def.value
 212              + bfd_get_section_vma (output_bfd,
 213                                     h->u.def.section->output_section)
 214              + h->u.def.section->output_offset);
 215
 216       val |= 1;
 217
 218       /* Now convert this value into a string and store it in entry_symbol
 219          where the lang_finish() function will pick it up.  */
 220       buffer[0] = '0';
 221       buffer[1] = 'x';
 222
 223       sprintf_vma (buffer + 2, val);
 224
 225       if (thumb_entry_symbol != NULL && entry_symbol.name != NULL
 226           && entry_from_cmdline)
 227         einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
 228                thumb_entry_symbol, entry_symbol.name);
 229       entry_symbol.name = buffer;
 230     }
 231   else
 232     einfo (_("%P: warning: connot find thumb start symbol %s\n"),
 233            thumb_entry_symbol);
 234 }
 235
 236 /* This is a convenitent point to tell BFD about target specific flags.
 237    After the output has been created, but before inputs are read.  */
 238 static void
 239 arm_elf_create_output_section_statements (void)
 240 {
 241   bfd_elf32_arm_set_target_relocs (&link_info, target1_is_rel, target2_type,
 242                                    fix_v4bx, use_blx, vfp11_denorm_fix);
 243 }
 244
 245 EOF
 246
 247 # Define some shell vars to insert bits of code into the standard elf
 248 # parse_args and list_options functions.
 249 #
 250 PARSE_AND_LIST_PROLOGUE='
 251 #define OPTION_THUMB_ENTRY              301
 252 #define OPTION_BE8                      302
 253 #define OPTION_TARGET1_REL              303
 254 #define OPTION_TARGET1_ABS              304
 255 #define OPTION_TARGET2                  305
 256 #define OPTION_FIX_V4BX                 306
 257 #define OPTION_USE_BLX                  307
 258 #define OPTION_VFP11_DENORM_FIX         308
 259 '
 260
 261 PARSE_AND_LIST_SHORTOPTS=p
 262
 263 PARSE_AND_LIST_LONGOPTS='
 264   { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
 265   { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
 266   { "be8", no_argument, NULL, OPTION_BE8},
 267   { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
 268   { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
 269   { "target2", required_argument, NULL, OPTION_TARGET2},
 270   { "fix-v4bx", no_argument, NULL, OPTION_FIX_V4BX},
 271   { "use-blx", no_argument, NULL, OPTION_USE_BLX},
 272   { "vfp11-denorm-fix", required_argument, NULL, OPTION_VFP11_DENORM_FIX},
 273 '
 274
 275 PARSE_AND_LIST_OPTIONS='
 276   fprintf (file, _("     --thumb-entry=<sym>      Set the entry point to be Thumb symbol <sym>\n"));
 277   fprintf (file, _("     --be8                    Oputput BE8 format image\n"));
 278   fprintf (file, _("     --target1=rel            Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
 279   fprintf (file, _("     --target1=abs            Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
 280   fprintf (file, _("     --target2=<type>         Specify definition of R_ARM_TARGET2\n"));
 281   fprintf (file, _("     --fix-v4bx               Rewrite BX rn as MOV pc, rn for ARMv4\n"));
 282   fprintf (file, _("     --use-blx                Enable use of BLX instructions\n"));
 283   fprintf (file, _("     --vfp11-denorm-fix       Specify how to fix VFP11 denorm erratum\n"));
 284 '
 285
 286 PARSE_AND_LIST_ARGS_CASES='
 287     case '\'p\'':
 288       /* Only here for backwards compatibility.  */
 289       break;
 290
 291     case OPTION_THUMB_ENTRY:
 292       thumb_entry_symbol = optarg;
 293       break;
 294
 295     case OPTION_BE8:
 296       byteswap_code = 1;
 297       break;
 298
 299     case OPTION_TARGET1_REL:
 300       target1_is_rel = 1;
 301       break;
 302
 303     case OPTION_TARGET1_ABS:
 304       target1_is_rel = 0;
 305       break;
 306
 307     case OPTION_TARGET2:
 308       target2_type = optarg;
 309       break;
 310
 311     case OPTION_FIX_V4BX:
 312       fix_v4bx = 1;
 313       break;
 314
 315     case OPTION_USE_BLX:
 316       use_blx = 1;
 317       break;
 318
 319     case OPTION_VFP11_DENORM_FIX:
 320       if (strcmp (optarg, "none") == 0)
 321         vfp11_denorm_fix = BFD_ARM_VFP11_FIX_NONE;
 322       else if (strcmp (optarg, "scalar") == 0)
 323         vfp11_denorm_fix = BFD_ARM_VFP11_FIX_SCALAR;
 324       else if (strcmp (optarg, "vector") == 0)
 325         vfp11_denorm_fix = BFD_ARM_VFP11_FIX_VECTOR;
 326       else
 327         einfo (_("Unrecognized VFP11 fix type '\''%s'\''.\n"), optarg);
 328       break;
 329 '
 330
 331 # We have our own after_open and before_allocation functions, but they call
 332 # the standard routines, so give them a different name.
 333 LDEMUL_AFTER_OPEN=arm_elf_after_open
 334 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
 335 LDEMUL_AFTER_ALLOCATION=arm_elf_after_allocation
 336 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
 337
 338 # Replace the elf before_parse function with our own.
 339 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
 340
 341 # Call the extra arm-elf function
 342 LDEMUL_FINISH=arm_elf_finish