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