ld/emultempl/nds32elf.em

   1 # This shell script emits a C file. -*- C -*-
   2 # Copyright (C) 2012-2014 Free Software Foundation, Inc.
   3 # Contributed by Andes Technology Corporation.
   4 #
   5 # This file is part of the GNU Binutils.
   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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  20 # MA 02110-1301, USA.
  21 #
  22
  23 fragment <<EOF
  24
  25 #include "libbfd.h"
  26 #include "elf-bfd.h"
  27 #include "elf/nds32.h"
  28 #include "bfd_stdint.h"
  29 #include "elf32-nds32.h"
  30
  31 static int relax_fp_as_gp = 1;          /* --mrelax-omit-fp  */
  32 static int eliminate_gc_relocs = 0;     /* --meliminate-gc-relocs  */
  33 static FILE *sym_ld_script = NULL;      /* --mgen-symbol-ld-script=<file>  */
  34 /* Disable if linking a dynamically linked executable.  */
  35 static int load_store_relax = 1;
  36 static int target_optimize = 0; /* Switch optimization.  */
  37 static int relax_status = 0;    /* Finished optimization.  */
  38 static int relax_round = 0;             /* Going optimization.  */
  39 static FILE *ex9_export_file = NULL;    /* --mexport-ex9=<file>  */
  40 static FILE *ex9_import_file = NULL;    /* --mimport-ex9=<file>  */
  41 static int update_ex9_table = 0;        /* --mupdate-ex9.  */
  42 static int ex9_limit = 511;
  43 static bfd_boolean ex9_loop_aware = FALSE;      /* Ignore ex9 if inside a loop.  */
  44 static bfd_boolean ifc_loop_aware = FALSE;      /* Ignore ifc if inside a loop.  */
  45
  46 /* Save the target options into output bfd to avoid using to many global
  47    variables. Do this after the output has been created, but before
  48    inputs are read.  */
  49 static void
  50 nds32_elf_create_output_section_statements (void)
  51 {
  52   if (strstr (bfd_get_target (link_info.output_bfd), "nds32") == NULL)
  53     {
  54       /* Check the output target is nds32.  */
  55       einfo ("%F%X%P: error: Cannot change output format whilst linking NDS32 binaries.\n");
  56       return;
  57     }
  58
  59   bfd_elf32_nds32_set_target_option (&link_info, relax_fp_as_gp,
  60                                      eliminate_gc_relocs,
  61                                      sym_ld_script,
  62                                      load_store_relax,
  63                                      target_optimize, relax_status, relax_round,
  64                                      ex9_export_file, ex9_import_file,
  65                                      update_ex9_table, ex9_limit,
  66                                      ex9_loop_aware, ifc_loop_aware);
  67 }
  68
  69 static void
  70 nds32_elf_after_parse (void)
  71 {
  72   if (link_info.relocatable)
  73     DISABLE_RELAXATION;
  74
  75   if (!RELAXATION_ENABLED)
  76     {
  77       target_optimize = target_optimize & (!NDS32_RELAX_JUMP_IFC_ON);
  78       target_optimize = target_optimize & (!NDS32_RELAX_EX9_ON);
  79       relax_fp_as_gp = 0;
  80     }
  81
  82   if (ex9_import_file != NULL)
  83     {
  84       ex9_export_file = NULL;
  85       target_optimize = target_optimize & (!NDS32_RELAX_EX9_ON);
  86     }
  87   else
  88     update_ex9_table = 0;
  89
  90   if (link_info.shared)
  91     {
  92       target_optimize = target_optimize & (!NDS32_RELAX_JUMP_IFC_ON);
  93       target_optimize = target_optimize & (!NDS32_RELAX_EX9_ON);
  94     }
  95
  96   after_parse_default ();
  97 }
  98
  99 static void
 100 nds32_elf_after_open (void)
 101 {
 102   unsigned int arch_ver = (unsigned int)-1;
 103   unsigned int abi_ver = (unsigned int)-1;
 104   bfd *abfd;
 105
 106   /* For now, make sure all object files are of the same architecture.
 107      We may try to merge object files with different architecture together.  */
 108   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
 109     {
 110       if (arch_ver == (unsigned int)-1 && E_N1_ARCH != (elf_elfheader (abfd)->e_flags & EF_NDS_ARCH))
 111         arch_ver = elf_elfheader (abfd)->e_flags & EF_NDS_ARCH ;
 112
 113       if (abi_ver == (unsigned int)-1)
 114         {
 115           /* Initialize ABI version, if not ABI0.
 116              (OS uses empty file to create empty ELF with ABI0).  */
 117           if ((elf_elfheader (abfd)->e_flags & EF_NDS_ABI) != 0)
 118             abi_ver = elf_elfheader (abfd)->e_flags & EF_NDS_ABI ;
 119         }
 120       else if ((elf_elfheader (abfd)->e_flags & EF_NDS_ABI) != 0
 121                && abi_ver != (elf_elfheader (abfd)->e_flags & EF_NDS_ABI))
 122         {
 123           /* Incompatible objects.  */
 124           einfo (_("%F%B: ABI version of object files mismatched\n"), abfd);
 125         }
 126
 127       /* Append .ex9.itable section in the last input object file.  */
 128       if (!link_info.relocatable && abfd->link_next == NULL)
 129         {
 130           asection *itable;
 131           struct bfd_link_hash_entry *h;
 132           itable = bfd_make_section_with_flags (abfd, ".ex9.itable",
 133                                                 SEC_CODE | SEC_ALLOC | SEC_LOAD
 134                                                 | SEC_HAS_CONTENTS | SEC_READONLY
 135                                                 | SEC_IN_MEMORY | SEC_KEEP);
 136           if (itable)
 137             {
 138               itable->gc_mark = 1;
 139               itable->alignment_power = 2;
 140               if ((target_optimize & NDS32_RELAX_EX9_ON))
 141                 {
 142                   itable->size = 0x1000;
 143                   itable->contents = bfd_zalloc (abfd, itable->size);
 144                 }
 145               else
 146                 {
 147                   itable->size = 0x4;
 148                   itable->contents = bfd_zalloc (abfd, itable->size);
 149                   bfd_putb32 (INSN_BREAK_EA,itable->contents);
 150                 }
 151
 152               /* Add a symbol in the head of ex9.itable to objdump clearly.  */
 153               h = bfd_link_hash_lookup (link_info.hash, "_EX9_BASE_",
 154                                         FALSE, FALSE, FALSE);
 155               _bfd_generic_link_add_one_symbol
 156                 (&link_info, link_info.output_bfd, "_EX9_BASE_",
 157                  BSF_GLOBAL | BSF_WEAK, itable, 0, (const char *) NULL, FALSE,
 158                  get_elf_backend_data (link_info.output_bfd)->collect, &h);
 159             }
 160         }
 161     }
 162
 163   /* Check object files if the target is dynamic linked executable
 164      or shared object.  */
 165   if (elf_hash_table (&link_info)->dynamic_sections_created
 166       || link_info.shared || link_info.pie)
 167     {
 168       for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
 169         {
 170           if (!(elf_elfheader (abfd)->e_flags & E_NDS32_HAS_PIC))
 171             {
 172               /* Non-PIC object file is used.  */
 173               if (link_info.shared || link_info.pie)
 174                 {
 175                   /* For PIE or shared object, all input must be PIC.  */
 176                   einfo (_("%B: must use -fpic to compile this file for shared object or PIE\n"), abfd);
 177                 }
 178               else
 179                 {
 180                   /* Dynamic linked executable with SDA and non-PIC.
 181                      Turn off load/store relaxtion.  */
 182                   load_store_relax = 0 ;
 183                   relax_fp_as_gp = 0;
 184                 }
 185             }
 186         }
 187       /* Turn off relax when building shared object or PIE
 188          until we can support their relaxation.  */
 189     }
 190
 191   /* Call the standard elf routine.  */
 192   gld${EMULATION_NAME}_after_open ();
 193 }
 194
 195 static void nds32_elf_relax_stub (bfd_boolean relax)
 196 {
 197   /* Re-caculate memory map address.  */
 198   lang_do_assignments (lang_assigning_phase_enum);
 199   lang_reset_memory_regions ();
 200   one_lang_size_sections_pass (&relax, FALSE);
 201 }
 202
 203 static void
 204 nds32_elf_after_allocation (void)
 205 {
 206   struct elf_nds32_link_hash_table *table;
 207   table = nds32_elf_hash_table (&link_info);
 208
 209   /* Call default after allocation callback.
 210      1. This is where relaxation is done.
 211      2. It calls gld${EMULATION_NAME}_map_segments to build ELF segment table.
 212      3. Any relaxation requires relax being done must be called after it.  */
 213   gld${EMULATION_NAME}_after_allocation ();
 214
 215   if (!table)
 216     return;
 217
 218   /* Use IFC */
 219   if ((target_optimize & NDS32_RELAX_JUMP_IFC_ON)
 220       && !(table->relax_status & NDS32_RELAX_JUMP_IFC_DONE))
 221     {
 222       table->relax_round = NDS32_RELAX_JUMP_IFC_ROUND;
 223       /* Traverse all sections to build j and jal list.  */
 224       nds32_elf_relax_stub (TRUE);
 225
 226       /* Replace with ifc.  */
 227       if (!nds32_elf_ifc_finish (&link_info))
 228         einfo (_("%F: Please report this bug. IFC error.\n"));
 229       table->relax_round = NDS32_RELAX_NONE_ROUND;
 230
 231       /* Adjust address after ifcall.  */
 232       nds32_elf_relax_stub (FALSE);
 233
 234       if (!nds32_elf_ifc_reloc ())
 235         einfo (_("%F: Please report this bug. IFC error.\n"));
 236     }
 237
 238   /* EX9 Instruction Table Relaxation.  */
 239   if (!link_info.relocatable && !nds32_elf_ex9_itb_base (&link_info))
 240     einfo (_("%F: Please report this bug. Ex9 relocation error.\n"));
 241
 242
 243   /* Generate ex9 table.  */
 244   if ((target_optimize & NDS32_RELAX_EX9_ON)
 245       && !(table->relax_status & NDS32_RELAX_EX9_DONE))
 246     {
 247       /* Ex9 entry point.  */
 248       table->relax_round = NDS32_RELAX_EX9_BUILD_ROUND;
 249
 250       /* Initialize ex9 hash table.  */
 251       if (!nds32_elf_ex9_init ())
 252         return;
 253
 254       /* Build ex9 instruction table.  */
 255       nds32_elf_relax_stub (TRUE);
 256       nds32_elf_ex9_finish (&link_info);
 257       /* Replace with ex9.it.  */
 258       nds32_elf_relax_stub (TRUE);
 259       table->relax_round = NDS32_RELAX_NONE_ROUND;
 260
 261       /* Do ifc again.  */
 262       if (target_optimize & NDS32_RELAX_JUMP_IFC_ON)
 263         if (!nds32_elf_ifc_finish (&link_info))
 264           einfo (_("%F: Please report this bug. IFC error.\n"));
 265
 266       /* Re-caculate memory map address.  */
 267       lang_do_assignments (lang_assigning_phase_enum);
 268       /* Relocation for .ex9.itable.  */
 269       nds32_elf_ex9_reloc_jmp (&link_info);
 270     }
 271   else if (ex9_import_file != NULL
 272       && !(table->relax_status = NDS32_RELAX_EX9_DONE))
 273     {
 274       /* Import ex9 table.  */
 275
 276       if (update_ex9_table == 1)
 277         {
 278           /* Build ex9 table.  */
 279           table->relax_round = NDS32_RELAX_EX9_BUILD_ROUND;
 280           /* Initialize ex9 hash table.  */
 281           if (!nds32_elf_ex9_init ())
 282             return;
 283           /* Build ex9 table.  */
 284           nds32_elf_relax_stub (TRUE);
 285
 286           /* Relocation for .ex9.itable.  */
 287           lang_do_assignments (lang_assigning_phase_enum);
 288           nds32_elf_ex9_reloc_jmp (&link_info);
 289         }
 290       nds32_elf_ex9_import_table (&link_info);
 291
 292       /* Replace with ex9.it.  */
 293       table->relax_round = NDS32_RELAX_EX9_REPLACE_ROUND;
 294       table->relax_status |= NDS32_RELAX_EX9_DONE;
 295       nds32_elf_relax_stub (TRUE);
 296     }
 297 }
 298
 299 EOF
 300 # Define some shell vars to insert bits of code into the standard elf
 301 # parse_args and list_options functions.
 302 #
 303 PARSE_AND_LIST_PROLOGUE='
 304 #define OPTION_BASELINE                 301
 305 #define OPTION_ELIM_GC_RELOCS           (OPTION_BASELINE + 1)
 306 #define OPTION_FP_AS_GP                 (OPTION_BASELINE + 2)
 307 #define OPTION_NO_FP_AS_GP              (OPTION_BASELINE + 3)
 308 #define OPTION_REDUCE_FP_UPDATE         (OPTION_BASELINE + 4)
 309 #define OPTION_NO_REDUCE_FP_UPDATE      (OPTION_BASELINE + 5)
 310 #define OPTION_EXPORT_SYMBOLS           (OPTION_BASELINE + 6)
 311
 312 /* These are only available to ex9.  */
 313 #if defined NDS32_EX9_EXT
 314 #define OPTION_EX9_BASELINE             320
 315 #define OPTION_EX9_TABLE                (OPTION_EX9_BASELINE + 1)
 316 #define OPTION_NO_EX9_TABLE             (OPTION_EX9_BASELINE + 2)
 317 #define OPTION_EXPORT_EX9               (OPTION_EX9_BASELINE + 3)
 318 #define OPTION_IMPORT_EX9               (OPTION_EX9_BASELINE + 4)
 319 #define OPTION_UPDATE_EX9               (OPTION_EX9_BASELINE + 5)
 320 #define OPTION_EX9_LIMIT                (OPTION_EX9_BASELINE + 6)
 321 #define OPTION_EX9_LOOP                 (OPTION_EX9_BASELINE + 7)
 322 #endif
 323
 324 /* These are only available to link-time ifc.  */
 325 #if defined NDS32_IFC_EXT
 326 #define OPTION_IFC_BASELINE             340
 327 #define OPTION_JUMP_IFC                 (OPTION_IFC_BASELINE + 1)
 328 #define OPTION_NO_JUMP_IFC              (OPTION_IFC_BASELINE + 2)
 329 #define OPTION_IFC_LOOP                 (OPTION_IFC_BASELINE + 3)
 330 #endif
 331 '
 332 PARSE_AND_LIST_LONGOPTS='
 333   { "mfp-as-gp", no_argument, NULL, OPTION_FP_AS_GP},
 334   { "mno-fp-as-gp", no_argument, NULL, OPTION_NO_FP_AS_GP},
 335   { "mgen-symbol-ld-script", required_argument, NULL, OPTION_EXPORT_SYMBOLS},
 336   /* These are deprecated options.  Remove them in the future.  */
 337   { "mrelax-reduce-fp-update", no_argument, NULL, OPTION_REDUCE_FP_UPDATE},
 338   { "mrelax-no-reduce-fp-update", no_argument, NULL, OPTION_NO_REDUCE_FP_UPDATE},
 339   { "mbaseline", required_argument, NULL, OPTION_BASELINE},
 340   { "meliminate-gc-relocs", no_argument, NULL, OPTION_ELIM_GC_RELOCS},
 341   { "mrelax-omit-fp", no_argument, NULL, OPTION_FP_AS_GP},
 342   { "mrelax-no-omit-fp", no_argument, NULL, OPTION_NO_FP_AS_GP},
 343   { "mgen-symbol-ld-script", required_argument, NULL, OPTION_EXPORT_SYMBOLS},
 344   /* These are specific optioins for ex9-ext support.  */
 345 #if defined NDS32_EX9_EXT
 346   { "mex9", no_argument, NULL, OPTION_EX9_TABLE},
 347   { "mno-ex9", no_argument, NULL, OPTION_NO_EX9_TABLE},
 348   { "mexport-ex9", required_argument, NULL, OPTION_EXPORT_EX9},
 349   { "mimport-ex9", required_argument, NULL, OPTION_IMPORT_EX9},
 350   { "mupdate-ex9", no_argument, NULL, OPTION_UPDATE_EX9},
 351   { "mex9-limit", required_argument, NULL, OPTION_EX9_LIMIT},
 352   { "mex9-loop-aware", no_argument, NULL, OPTION_EX9_LOOP},
 353 #endif
 354   /* These are specific optioins for ifc-ext support.  */
 355 #if defined NDS32_IFC_EXT
 356   { "mifc", no_argument, NULL, OPTION_JUMP_IFC},
 357   { "mno-ifc", no_argument, NULL, OPTION_NO_JUMP_IFC},
 358   { "mifc-loop-aware", no_argument, NULL, OPTION_IFC_LOOP},
 359 #endif
 360 '
 361 PARSE_AND_LIST_OPTIONS='
 362   fprintf (file, _("\
 363   --m[no-]fp-as-gp            Disable/enable fp-as-gp relaxation\n\
 364   --mexport-symbols=FILE      Exporting symbols in linker script\n\
 365 "));
 366
 367 #if defined NDS32_EX9_EXT
 368   fprintf (file, _("\
 369   --m[no-]ex9                 Disable/enable link-time EX9 relaxation\n\
 370   --mexport-ex9=FILE          Export EX9 table after linking\n\
 371   --mimport-ex9=FILE          Import Ex9 table for EX9 relaxation\n\
 372   --mupdate-ex9               Update existing EX9 table\n\
 373   --mex9-limit=NUM            Maximum number of entries in ex9 table\n\
 374   --mex9-loop-aware           Avoid generate EX9 instruction inside loop\n\
 375 "));
 376 #endif
 377
 378 #if defined NDS32_IFC_EXT
 379   fprintf (file, _("\
 380   --m[no-]ifc                 Disable/enable link-time IFC optimization\n\
 381   --mifc-loop-aware           Avoid generate IFC instruction inside loop\n\
 382 "));
 383 #endif
 384 '
 385 PARSE_AND_LIST_ARGS_CASES='
 386   case OPTION_BASELINE:
 387     einfo ("%P: --mbaseline is not used anymore.\n");
 388     break;
 389   case OPTION_ELIM_GC_RELOCS:
 390     eliminate_gc_relocs = 1;
 391     break;
 392   case OPTION_FP_AS_GP:
 393   case OPTION_NO_FP_AS_GP:
 394     relax_fp_as_gp = (optc == OPTION_FP_AS_GP);
 395     break;
 396   case OPTION_REDUCE_FP_UPDATE:
 397   case OPTION_NO_REDUCE_FP_UPDATE:
 398     einfo ("%P: --relax-[no-]reduce-fp-updat is not used anymore.\n");
 399     break;
 400   case OPTION_EXPORT_SYMBOLS:
 401     if (!optarg)
 402       einfo (_("Missing file for --mgen-symbol-ld-script.\n"), optarg);
 403
 404     if(strcmp (optarg, "-") == 0)
 405       sym_ld_script = stdout;
 406     else
 407       {
 408         sym_ld_script = fopen (optarg, FOPEN_WT);
 409         if(sym_ld_script == NULL)
 410           einfo (_("%P%F: cannot open map file %s: %E.\n"), optarg);
 411       }
 412     break;
 413 #if defined NDS32_EX9_EXT
 414   case OPTION_EX9_TABLE:
 415     target_optimize = target_optimize | NDS32_RELAX_EX9_ON;
 416     break;
 417   case OPTION_NO_EX9_TABLE:
 418     target_optimize = target_optimize & (!NDS32_RELAX_EX9_ON);
 419     break;
 420   case OPTION_EXPORT_EX9:
 421     if (!optarg)
 422       einfo (_("Missing file for --mexport-ex9=<file>.\n"));
 423
 424     if(strcmp (optarg, "-") == 0)
 425       ex9_export_file = stdout;
 426     else
 427       {
 428         ex9_export_file = fopen (optarg, FOPEN_WT);
 429         if(ex9_export_file == NULL)
 430           einfo (_("ERROR %P%F: cannot open ex9 export file %s.\n"), optarg);
 431       }
 432     break;
 433   case OPTION_IMPORT_EX9:
 434     if (!optarg)
 435       einfo (_("Missing file for --mimport-ex9=<file>.\n"));
 436
 437     ex9_import_file = fopen (optarg, "r+");
 438     if(ex9_import_file == NULL)
 439       einfo (_("ERROR %P%F: cannot open ex9 import file %s.\n"), optarg);
 440     break;
 441   case OPTION_UPDATE_EX9:
 442     update_ex9_table = 1;
 443     break;
 444   case OPTION_EX9_LIMIT:
 445     if (optarg)
 446       {
 447         ex9_limit = atoi (optarg);
 448         if (ex9_limit > 511 || ex9_limit < 1)
 449           {
 450             einfo (_("ERROR: the range of ex9_limit must between 1 and 511\n"));
 451             exit (1);
 452           }
 453       }
 454     break;
 455   case OPTION_EX9_LOOP:
 456     target_optimize = target_optimize | NDS32_RELAX_EX9_ON;
 457     ex9_loop_aware = 1;
 458     break;
 459 #endif
 460 #if defined NDS32_IFC_EXT
 461   case OPTION_JUMP_IFC:
 462     target_optimize = target_optimize | NDS32_RELAX_JUMP_IFC_ON;
 463     break;
 464   case OPTION_NO_JUMP_IFC:
 465     target_optimize = target_optimize & (!NDS32_RELAX_JUMP_IFC_ON);
 466     break;
 467   case OPTION_IFC_LOOP:
 468     target_optimize = target_optimize | NDS32_RELAX_JUMP_IFC_ON;
 469     ifc_loop_aware = 1;
 470     break;
 471 #endif
 472 '
 473 LDEMUL_AFTER_OPEN=nds32_elf_after_open
 474 LDEMUL_AFTER_PARSE=nds32_elf_after_parse
 475 LDEMUL_AFTER_ALLOCATION=nds32_elf_after_allocation
 476 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=nds32_elf_create_output_section_statements