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, 2007, 2008
   4 #   Free Software Foundation, Inc.
   5 #
   6 # This file is part of the GNU Binutils.
   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 3 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,
  21 # MA 02110-1301, USA.
  22 #
  23
  24 # This file is sourced from elf32.em, and defines extra arm-elf
  25 # specific routines.
  26 #
  27 test -z "$TARGET2_TYPE" && TARGET2_TYPE="rel"
  28 fragment <<EOF
  29
  30 #include "elf/arm.h"
  31
  32 static char *thumb_entry_symbol = NULL;
  33 static bfd *bfd_for_interwork;
  34 static int byteswap_code = 0;
  35 static int target1_is_rel = 0${TARGET1_IS_REL};
  36 static char *target2_type = "${TARGET2_TYPE}";
  37 static int fix_v4bx = 0;
  38 static int use_blx = 0;
  39 static bfd_arm_vfp11_fix vfp11_denorm_fix = BFD_ARM_VFP11_FIX_DEFAULT;
  40 static int no_enum_size_warning = 0;
  41 static int pic_veneer = 0;
  42
  43 static void
  44 gld${EMULATION_NAME}_before_parse (void)
  45 {
  46 #ifndef TARGET_                 /* I.e., if not generic.  */
  47   ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
  48 #endif /* not TARGET_ */
  49   config.dynamic_link = ${DYNAMIC_LINK-TRUE};
  50   config.has_shared = `if test -n "$GENERATE_SHLIB_SCRIPT" ; then echo TRUE ; else echo FALSE ; fi`;
  51 }
  52
  53 static void
  54 arm_elf_after_open (void)
  55 {
  56   if (strstr (bfd_get_target (link_info.output_bfd), "arm") == NULL)
  57     {
  58       /* The arm backend needs special fields in the output hash structure.
  59          These will only be created if the output format is an arm format,
  60          hence we do not support linking and changing output formats at the
  61          same time.  Use a link followed by objcopy to change output formats.  */
  62       einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
  63       return;
  64     }
  65
  66   {
  67     LANG_FOR_EACH_INPUT_STATEMENT (is)
  68       {
  69         bfd_elf32_arm_add_glue_sections_to_bfd (is->the_bfd, & link_info);
  70       }
  71   }
  72
  73   /* Call the standard elf routine.  */
  74   gld${EMULATION_NAME}_after_open ();
  75 }
  76
  77 static void
  78 arm_elf_set_bfd_for_interworking (lang_statement_union_type *statement)
  79 {
  80   if (statement->header.type == lang_input_section_enum)
  81     {
  82       asection *i = statement->input_section.section;
  83
  84       if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
  85           && (i->flags & SEC_EXCLUDE) == 0)
  86         {
  87           asection *output_section = i->output_section;
  88
  89           ASSERT (output_section->owner == link_info.output_bfd);
  90
  91           /* Don't attach the interworking stubs to a dynamic object, to
  92              an empty section, etc.  */
  93           if ((output_section->flags & SEC_HAS_CONTENTS) != 0
  94               && (i->flags & SEC_NEVER_LOAD) == 0
  95               && ! (i->owner->flags & DYNAMIC)
  96               && ! i->owner->output_has_begun)
  97             {
  98               bfd_for_interwork = i->owner;
  99               bfd_for_interwork->output_has_begun = TRUE;
 100             }
 101         }
 102     }
 103 }
 104
 105 static void
 106 arm_elf_before_allocation (void)
 107 {
 108   bfd *tem;
 109
 110   if (link_info.input_bfds != NULL)
 111     {
 112       /* The interworking bfd must be the last one in the link.  */
 113       bfd_for_interwork = NULL;
 114       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 115         tem->output_has_begun = FALSE;
 116
 117       lang_for_each_statement (arm_elf_set_bfd_for_interworking);
 118       for (tem = link_info.input_bfds; tem != NULL; tem = tem->link_next)
 119         tem->output_has_begun = FALSE;
 120
 121       /* If bfd_for_interwork is NULL, then there are no loadable sections
 122          with real contents to be linked, so we are not going to have to
 123          create any interworking stubs, so it is OK not to call
 124          bfd_elf32_arm_get_bfd_for_interworking.  */
 125       if (bfd_for_interwork != NULL)
 126         bfd_elf32_arm_get_bfd_for_interworking (bfd_for_interwork, &link_info);
 127     }
 128
 129   bfd_elf32_arm_set_byteswap_code (&link_info, byteswap_code);
 130
 131   /* Choose type of VFP11 erratum fix, or warn if specified fix is unnecessary
 132      due to architecture version.  */
 133   bfd_elf32_arm_set_vfp11_fix (link_info.output_bfd, &link_info);
 134
 135   /* We should be able to set the size of the interworking stub section.  We
 136      can't do it until later if we have dynamic sections, though.  */
 137   if (! elf_hash_table (&link_info)->dynamic_sections_created)
 138     {
 139       /* Here we rummage through the found bfds to collect glue information.  */
 140       LANG_FOR_EACH_INPUT_STATEMENT (is)
 141         {
 142           /* Initialise mapping tables for code/data.  */
 143           bfd_elf32_arm_init_maps (is->the_bfd);
 144
 145           if (!bfd_elf32_arm_process_before_allocation (is->the_bfd,
 146                                                         &link_info)
 147               || !bfd_elf32_arm_vfp11_erratum_scan (is->the_bfd, &link_info))
 148             /* xgettext:c-format */
 149             einfo (_("Errors encountered processing file %s"), is->filename);
 150         }
 151     }
 152
 153   /* Call the standard elf routine.  */
 154   gld${EMULATION_NAME}_before_allocation ();
 155
 156   /* We have seen it all. Allocate it, and carry on.  */
 157   bfd_elf32_arm_allocate_interworking_sections (& link_info);
 158 }
 159
 160 static void
 161 arm_elf_after_allocation (void)
 162 {
 163   /* Call the standard elf routine.  */
 164   after_allocation_default ();
 165
 166   {
 167     LANG_FOR_EACH_INPUT_STATEMENT (is)
 168       {
 169         /* Figure out where VFP11 erratum veneers (and the labels returning
 170            from same) have been placed.  */
 171         bfd_elf32_arm_vfp11_fix_veneer_locations (is->the_bfd, &link_info);
 172       }
 173   }
 174 }
 175
 176 static void
 177 arm_elf_finish (void)
 178 {
 179   struct bfd_link_hash_entry * h;
 180
 181   /* Call the elf32.em routine.  */
 182   gld${EMULATION_NAME}_finish ();
 183
 184   if (thumb_entry_symbol)
 185     {
 186       h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
 187                                 FALSE, FALSE, TRUE);
 188     }
 189   else
 190     {
 191       struct elf_link_hash_entry * eh;
 192
 193       if (!entry_symbol.name)
 194         return;
 195
 196       h = bfd_link_hash_lookup (link_info.hash, entry_symbol.name,
 197                                 FALSE, FALSE, TRUE);
 198       eh = (struct elf_link_hash_entry *)h;
 199       if (!h || ELF_ST_TYPE(eh->type) != STT_ARM_TFUNC)
 200         return;
 201     }
 202
 203
 204   if (h != (struct bfd_link_hash_entry *) NULL
 205       && (h->type == bfd_link_hash_defined
 206           || h->type == bfd_link_hash_defweak)
 207       && h->u.def.section->output_section != NULL)
 208     {
 209       static char buffer[32];
 210       bfd_vma val;
 211
 212       /* Special procesing is required for a Thumb entry symbol.  The
 213          bottom bit of its address must be set.  */
 214       val = (h->u.def.value
 215              + bfd_get_section_vma (link_info.output_bfd,
 216                                     h->u.def.section->output_section)
 217              + h->u.def.section->output_offset);
 218
 219       val |= 1;
 220
 221       /* Now convert this value into a string and store it in entry_symbol
 222          where the lang_finish() function will pick it up.  */
 223       buffer[0] = '0';
 224       buffer[1] = 'x';
 225
 226       sprintf_vma (buffer + 2, val);
 227
 228       if (thumb_entry_symbol != NULL && entry_symbol.name != NULL
 229           && entry_from_cmdline)
 230         einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
 231                thumb_entry_symbol, entry_symbol.name);
 232       entry_symbol.name = buffer;
 233     }
 234   else
 235     einfo (_("%P: warning: cannot find thumb start symbol %s\n"),
 236            thumb_entry_symbol);
 237 }
 238
 239 /* This is a convenient point to tell BFD about target specific flags.
 240    After the output has been created, but before inputs are read.  */
 241 static void
 242 arm_elf_create_output_section_statements (void)
 243 {
 244   bfd_elf32_arm_set_target_relocs (link_info.output_bfd, &link_info,
 245                                    target1_is_rel,
 246                                    target2_type, fix_v4bx, use_blx,
 247                                    vfp11_denorm_fix, no_enum_size_warning,
 248                                    pic_veneer);
 249 }
 250
 251 EOF
 252
 253 # Define some shell vars to insert bits of code into the standard elf
 254 # parse_args and list_options functions.
 255 #
 256 PARSE_AND_LIST_PROLOGUE='
 257 #define OPTION_THUMB_ENTRY              301
 258 #define OPTION_BE8                      302
 259 #define OPTION_TARGET1_REL              303
 260 #define OPTION_TARGET1_ABS              304
 261 #define OPTION_TARGET2                  305
 262 #define OPTION_FIX_V4BX                 306
 263 #define OPTION_USE_BLX                  307
 264 #define OPTION_VFP11_DENORM_FIX         308
 265 #define OPTION_NO_ENUM_SIZE_WARNING     309
 266 #define OPTION_PIC_VENEER               310
 267 '
 268
 269 PARSE_AND_LIST_SHORTOPTS=p
 270
 271 PARSE_AND_LIST_LONGOPTS='
 272   { "no-pipeline-knowledge", no_argument, NULL, '\'p\''},
 273   { "thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
 274   { "be8", no_argument, NULL, OPTION_BE8},
 275   { "target1-rel", no_argument, NULL, OPTION_TARGET1_REL},
 276   { "target1-abs", no_argument, NULL, OPTION_TARGET1_ABS},
 277   { "target2", required_argument, NULL, OPTION_TARGET2},
 278   { "fix-v4bx", no_argument, NULL, OPTION_FIX_V4BX},
 279   { "use-blx", no_argument, NULL, OPTION_USE_BLX},
 280   { "vfp11-denorm-fix", required_argument, NULL, OPTION_VFP11_DENORM_FIX},
 281   { "no-enum-size-warning", no_argument, NULL, OPTION_NO_ENUM_SIZE_WARNING},
 282   { "pic-veneer", no_argument, NULL, OPTION_PIC_VENEER},
 283 '
 284
 285 PARSE_AND_LIST_OPTIONS='
 286   fprintf (file, _("  --thumb-entry=<sym>         Set the entry point to be Thumb symbol <sym>\n"));
 287   fprintf (file, _("  --be8                       Oputput BE8 format image\n"));
 288   fprintf (file, _("  --target1=rel               Interpret R_ARM_TARGET1 as R_ARM_REL32\n"));
 289   fprintf (file, _("  --target1=abs               Interpret R_ARM_TARGET1 as R_ARM_ABS32\n"));
 290   fprintf (file, _("  --target2=<type>            Specify definition of R_ARM_TARGET2\n"));
 291   fprintf (file, _("  --fix-v4bx                  Rewrite BX rn as MOV pc, rn for ARMv4\n"));
 292   fprintf (file, _("  --use-blx                   Enable use of BLX instructions\n"));
 293   fprintf (file, _("  --vfp11-denorm-fix          Specify how to fix VFP11 denorm erratum\n"));
 294   fprintf (file, _("  --no-enum-size-warning      Don'\''t warn about objects with incompatible"
 295                    "                                enum sizes\n"));
 296   fprintf (file, _("  --pic-veneer                Always generate PIC interworking veneers\n"));
 297 '
 298
 299 PARSE_AND_LIST_ARGS_CASES='
 300     case '\'p\'':
 301       /* Only here for backwards compatibility.  */
 302       break;
 303
 304     case OPTION_THUMB_ENTRY:
 305       thumb_entry_symbol = optarg;
 306       break;
 307
 308     case OPTION_BE8:
 309       byteswap_code = 1;
 310       break;
 311
 312     case OPTION_TARGET1_REL:
 313       target1_is_rel = 1;
 314       break;
 315
 316     case OPTION_TARGET1_ABS:
 317       target1_is_rel = 0;
 318       break;
 319
 320     case OPTION_TARGET2:
 321       target2_type = optarg;
 322       break;
 323
 324     case OPTION_FIX_V4BX:
 325       fix_v4bx = 1;
 326       break;
 327
 328     case OPTION_USE_BLX:
 329       use_blx = 1;
 330       break;
 331
 332     case OPTION_VFP11_DENORM_FIX:
 333       if (strcmp (optarg, "none") == 0)
 334         vfp11_denorm_fix = BFD_ARM_VFP11_FIX_NONE;
 335       else if (strcmp (optarg, "scalar") == 0)
 336         vfp11_denorm_fix = BFD_ARM_VFP11_FIX_SCALAR;
 337       else if (strcmp (optarg, "vector") == 0)
 338         vfp11_denorm_fix = BFD_ARM_VFP11_FIX_VECTOR;
 339       else
 340         einfo (_("Unrecognized VFP11 fix type '\''%s'\''.\n"), optarg);
 341       break;
 342
 343     case OPTION_NO_ENUM_SIZE_WARNING:
 344       no_enum_size_warning = 1;
 345       break;
 346
 347     case OPTION_PIC_VENEER:
 348       pic_veneer = 1;
 349       break;
 350 '
 351
 352 # We have our own after_open and before_allocation functions, but they call
 353 # the standard routines, so give them a different name.
 354 LDEMUL_AFTER_OPEN=arm_elf_after_open
 355 LDEMUL_BEFORE_ALLOCATION=arm_elf_before_allocation
 356 LDEMUL_AFTER_ALLOCATION=arm_elf_after_allocation
 357 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=arm_elf_create_output_section_statements
 358
 359 # Replace the elf before_parse function with our own.
 360 LDEMUL_BEFORE_PARSE=gld"${EMULATION_NAME}"_before_parse
 361
 362 # Call the extra arm-elf function
 363 LDEMUL_FINISH=arm_elf_finish