ld/emultempl/nds32elf.em

   1 # This shell script emits a C file. -*- C -*-
   2 # Copyright (C) 2012-2017 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 "elf-bfd.h"
  26 #include "elf/nds32.h"
  27 #include "bfd_stdint.h"
  28 #include "elf32-nds32.h"
  29
  30 static int relax_fp_as_gp = 1;          /* --mrelax-omit-fp  */
  31 static int eliminate_gc_relocs = 0;     /* --meliminate-gc-relocs  */
  32 static FILE *sym_ld_script = NULL;      /* --mgen-symbol-ld-script=<file>  */
  33 /* Disable if linking a dynamically linked executable.  */
  34 static int load_store_relax = 1;
  35 static int target_optimize = 0; /* Switch optimization.  */
  36 static int relax_status = 0;    /* Finished optimization.  */
  37 static int relax_round = 0;             /* Going optimization.  */
  38 static FILE *ex9_export_file = NULL;    /* --mexport-ex9=<file>  */
  39 static FILE *ex9_import_file = NULL;    /* --mimport-ex9=<file>  */
  40 static int update_ex9_table = 0;        /* --mupdate-ex9.  */
  41 static int ex9_limit = 511;
  42 static bfd_boolean ex9_loop_aware = FALSE;      /* Ignore ex9 if inside a loop.  */
  43 static bfd_boolean ifc_loop_aware = FALSE;      /* Ignore ifc if inside a loop.  */
  44
  45 /* Save the target options into output bfd to avoid using to many global
  46    variables. Do this after the output has been created, but before
  47    inputs are read.  */
  48 static void
  49 nds32_elf_create_output_section_statements (void)
  50 {
  51   if (strstr (bfd_get_target (link_info.output_bfd), "nds32") == NULL)
  52     {
  53       /* Check the output target is nds32.  */
  54       einfo (_("%F%X%P: error: Cannot change output format whilst "
  55                "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 (bfd_link_relocatable (&link_info))
  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 (bfd_link_pic (&link_info))
  91     {
  92       target_optimize = target_optimize & (!NDS32_RELAX_JUMP_IFC_ON);
  93       target_optimize = target_optimize & (!NDS32_RELAX_EX9_ON);
  94     }
  95
  96   gld${EMULATION_NAME}_after_parse ();
  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 #if defined NDS32_EX9_EXT
 128       /* Append .ex9.itable section in the last input object file.  */
 129       if (abfd->link_next == NULL && (target_optimize & NDS32_RELAX_EX9_ON))
 130         {
 131           asection *itable;
 132           struct bfd_link_hash_entry *h;
 133           itable = bfd_make_section_with_flags (abfd, ".ex9.itable",
 134                                                 SEC_CODE | SEC_ALLOC | SEC_LOAD
 135                                                 | SEC_HAS_CONTENTS | SEC_READONLY
 136                                                 | SEC_IN_MEMORY | SEC_KEEP);
 137           if (itable)
 138             {
 139               itable->gc_mark = 1;
 140               itable->alignment_power = 2;
 141               itable->size = 0x1000;
 142               itable->contents = bfd_zalloc (abfd, itable->size);
 143
 144               /* Add a symbol in the head of ex9.itable to objdump clearly.  */
 145               h = bfd_link_hash_lookup (link_info.hash, "_EX9_BASE_",
 146                                         FALSE, FALSE, FALSE);
 147               _bfd_generic_link_add_one_symbol
 148                 (&link_info, link_info.output_bfd, "_EX9_BASE_",
 149                  BSF_GLOBAL | BSF_WEAK, itable, 0, (const char *) NULL, FALSE,
 150                  get_elf_backend_data (link_info.output_bfd)->collect, &h);
 151             }
 152         }
 153 #endif
 154     }
 155
 156   /* Check object files if the target is dynamic linked executable
 157      or shared object.  */
 158   if (elf_hash_table (&link_info)->dynamic_sections_created
 159       || bfd_link_pic (&link_info))
 160     {
 161       for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
 162         {
 163           if (!(elf_elfheader (abfd)->e_flags & E_NDS32_HAS_PIC))
 164             {
 165               /* Non-PIC object file is used.  */
 166               if (bfd_link_pic (&link_info))
 167                 {
 168                   /* For PIE or shared object, all input must be PIC.  */
 169                   einfo (_("%B: must use -fpic to compile this file "
 170                            "for shared object or PIE\n"), abfd);
 171                 }
 172               else
 173                 {
 174                   /* Dynamic linked executable with SDA and non-PIC.
 175                      Turn off load/store relaxtion.  */
 176                   /* TODO: This may support in the future.  */
 177                   load_store_relax = 0 ;
 178                   relax_fp_as_gp = 0;
 179                 }
 180             }
 181         }
 182       /* Turn off relax when building shared object or PIE
 183          until we can support their relaxation.  */
 184     }
 185
 186   /* Call the standard elf routine.  */
 187   gld${EMULATION_NAME}_after_open ();
 188 }
 189
 190 static void
 191 nds32_elf_after_allocation (void)
 192 {
 193   if (target_optimize & NDS32_RELAX_EX9_ON
 194       || (ex9_import_file != NULL && update_ex9_table == 1))
 195     {
 196       /* Initialize ex9 hash table.  */
 197       if (!nds32_elf_ex9_init ())
 198         return;
 199     }
 200
 201   /* Call default after allocation callback.
 202      1. This is where relaxation is done.
 203      2. It calls gld${EMULATION_NAME}_map_segments to build ELF segment table.
 204      3. Any relaxation requires relax being done must be called after it.  */
 205   gld${EMULATION_NAME}_after_allocation ();
 206 }
 207
 208 EOF
 209 # Define some shell vars to insert bits of code into the standard elf
 210 # parse_args and list_options functions.
 211 #
 212 PARSE_AND_LIST_PROLOGUE='
 213 #define OPTION_BASELINE                 301
 214 #define OPTION_ELIM_GC_RELOCS           (OPTION_BASELINE + 1)
 215 #define OPTION_FP_AS_GP                 (OPTION_BASELINE + 2)
 216 #define OPTION_NO_FP_AS_GP              (OPTION_BASELINE + 3)
 217 #define OPTION_REDUCE_FP_UPDATE         (OPTION_BASELINE + 4)
 218 #define OPTION_NO_REDUCE_FP_UPDATE      (OPTION_BASELINE + 5)
 219 #define OPTION_EXPORT_SYMBOLS           (OPTION_BASELINE + 6)
 220
 221 /* These are only available to ex9.  */
 222 #if defined NDS32_EX9_EXT
 223 #define OPTION_EX9_BASELINE             320
 224 #define OPTION_EX9_TABLE                (OPTION_EX9_BASELINE + 1)
 225 #define OPTION_NO_EX9_TABLE             (OPTION_EX9_BASELINE + 2)
 226 #define OPTION_EXPORT_EX9               (OPTION_EX9_BASELINE + 3)
 227 #define OPTION_IMPORT_EX9               (OPTION_EX9_BASELINE + 4)
 228 #define OPTION_UPDATE_EX9               (OPTION_EX9_BASELINE + 5)
 229 #define OPTION_EX9_LIMIT                (OPTION_EX9_BASELINE + 6)
 230 #define OPTION_EX9_LOOP                 (OPTION_EX9_BASELINE + 7)
 231 #endif
 232
 233 /* These are only available to link-time ifc.  */
 234 #if defined NDS32_IFC_EXT
 235 #define OPTION_IFC_BASELINE             340
 236 #define OPTION_JUMP_IFC                 (OPTION_IFC_BASELINE + 1)
 237 #define OPTION_NO_JUMP_IFC              (OPTION_IFC_BASELINE + 2)
 238 #define OPTION_IFC_LOOP                 (OPTION_IFC_BASELINE + 3)
 239 #endif
 240 '
 241 PARSE_AND_LIST_LONGOPTS='
 242   { "mfp-as-gp", no_argument, NULL, OPTION_FP_AS_GP},
 243   { "mno-fp-as-gp", no_argument, NULL, OPTION_NO_FP_AS_GP},
 244   { "mexport-symbols", required_argument, NULL, OPTION_EXPORT_SYMBOLS},
 245   /* These are deprecated options.  Remove them in the future.  */
 246   { "mrelax-reduce-fp-update", no_argument, NULL, OPTION_REDUCE_FP_UPDATE},
 247   { "mrelax-no-reduce-fp-update", no_argument, NULL, OPTION_NO_REDUCE_FP_UPDATE},
 248   { "mbaseline", required_argument, NULL, OPTION_BASELINE},
 249   { "meliminate-gc-relocs", no_argument, NULL, OPTION_ELIM_GC_RELOCS},
 250   { "mrelax-omit-fp", no_argument, NULL, OPTION_FP_AS_GP},
 251   { "mrelax-no-omit-fp", no_argument, NULL, OPTION_NO_FP_AS_GP},
 252   { "mgen-symbol-ld-script", required_argument, NULL, OPTION_EXPORT_SYMBOLS},
 253   /* These are specific optioins for ex9-ext support.  */
 254 #if defined NDS32_EX9_EXT
 255   { "mex9", no_argument, NULL, OPTION_EX9_TABLE},
 256   { "mno-ex9", no_argument, NULL, OPTION_NO_EX9_TABLE},
 257   { "mexport-ex9", required_argument, NULL, OPTION_EXPORT_EX9},
 258   { "mimport-ex9", required_argument, NULL, OPTION_IMPORT_EX9},
 259   { "mupdate-ex9", no_argument, NULL, OPTION_UPDATE_EX9},
 260   { "mex9-limit", required_argument, NULL, OPTION_EX9_LIMIT},
 261   { "mex9-loop-aware", no_argument, NULL, OPTION_EX9_LOOP},
 262 #endif
 263   /* These are specific optioins for ifc-ext support.  */
 264 #if defined NDS32_IFC_EXT
 265   { "mifc", no_argument, NULL, OPTION_JUMP_IFC},
 266   { "mno-ifc", no_argument, NULL, OPTION_NO_JUMP_IFC},
 267   { "mifc-loop-aware", no_argument, NULL, OPTION_IFC_LOOP},
 268 #endif
 269 '
 270 PARSE_AND_LIST_OPTIONS='
 271   fprintf (file, _("\
 272   --m[no-]fp-as-gp            Disable/enable fp-as-gp relaxation\n\
 273   --mexport-symbols=FILE      Exporting symbols in linker script\n\
 274 "));
 275
 276 #if defined NDS32_EX9_EXT
 277   fprintf (file, _("\
 278   --m[no-]ex9                 Disable/enable link-time EX9 relaxation\n\
 279   --mexport-ex9=FILE          Export EX9 table after linking\n\
 280   --mimport-ex9=FILE          Import Ex9 table for EX9 relaxation\n\
 281   --mupdate-ex9               Update existing EX9 table\n\
 282   --mex9-limit=NUM            Maximum number of entries in ex9 table\n\
 283   --mex9-loop-aware           Avoid generate EX9 instruction inside loop\n\
 284 "));
 285 #endif
 286
 287 #if defined NDS32_IFC_EXT
 288   fprintf (file, _("\
 289   --m[no-]ifc                 Disable/enable link-time IFC optimization\n\
 290   --mifc-loop-aware           Avoid generate IFC instruction inside loop\n\
 291 "));
 292 #endif
 293 '
 294 PARSE_AND_LIST_ARGS_CASES='
 295   case OPTION_BASELINE:
 296     einfo (_("%P: --mbaseline is not used anymore.\n"));
 297     break;
 298   case OPTION_ELIM_GC_RELOCS:
 299     eliminate_gc_relocs = 1;
 300     break;
 301   case OPTION_FP_AS_GP:
 302   case OPTION_NO_FP_AS_GP:
 303     relax_fp_as_gp = (optc == OPTION_FP_AS_GP);
 304     break;
 305   case OPTION_REDUCE_FP_UPDATE:
 306   case OPTION_NO_REDUCE_FP_UPDATE:
 307     einfo (_("%P: --relax-[no-]reduce-fp-updat is not used anymore.\n"));
 308     break;
 309   case OPTION_EXPORT_SYMBOLS:
 310     if (!optarg)
 311       einfo (_("Missing file for --mexport-symbols.\n"), optarg);
 312
 313     if(strcmp (optarg, "-") == 0)
 314       sym_ld_script = stdout;
 315     else
 316       {
 317         sym_ld_script = fopen (optarg, FOPEN_WT);
 318         if(sym_ld_script == NULL)
 319           einfo (_("%P%F: cannot open map file %s: %E.\n"), optarg);
 320       }
 321     break;
 322 #if defined NDS32_EX9_EXT
 323   case OPTION_EX9_TABLE:
 324     target_optimize = target_optimize | NDS32_RELAX_EX9_ON;
 325     break;
 326   case OPTION_NO_EX9_TABLE:
 327     target_optimize = target_optimize & (!NDS32_RELAX_EX9_ON);
 328     break;
 329   case OPTION_EXPORT_EX9:
 330     if (!optarg)
 331       einfo (_("Missing file for --mexport-ex9=<file>.\n"));
 332
 333     if(strcmp (optarg, "-") == 0)
 334       ex9_export_file = stdout;
 335     else
 336       {
 337         ex9_export_file = fopen (optarg, "wb");
 338         if(ex9_export_file == NULL)
 339           einfo (_("ERROR %P%F: cannot open ex9 export file %s.\n"), optarg);
 340       }
 341     break;
 342   case OPTION_IMPORT_EX9:
 343     if (!optarg)
 344       einfo (_("Missing file for --mimport-ex9=<file>.\n"));
 345
 346     ex9_import_file = fopen (optarg, "rb+");
 347     if(ex9_import_file == NULL)
 348       einfo (_("ERROR %P%F: cannot open ex9 import file %s.\n"), optarg);
 349     break;
 350   case OPTION_UPDATE_EX9:
 351     update_ex9_table = 1;
 352     break;
 353   case OPTION_EX9_LIMIT:
 354     if (optarg)
 355       {
 356         ex9_limit = atoi (optarg);
 357         if (ex9_limit > 511 || ex9_limit < 1)
 358           {
 359             einfo (_("ERROR: the range of ex9_limit must between 1 and 511\n"));
 360             exit (1);
 361           }
 362       }
 363     break;
 364   case OPTION_EX9_LOOP:
 365     target_optimize = target_optimize | NDS32_RELAX_EX9_ON;
 366     ex9_loop_aware = 1;
 367     break;
 368 #endif
 369 #if defined NDS32_IFC_EXT
 370   case OPTION_JUMP_IFC:
 371     target_optimize = target_optimize | NDS32_RELAX_JUMP_IFC_ON;
 372     break;
 373   case OPTION_NO_JUMP_IFC:
 374     target_optimize = target_optimize & (!NDS32_RELAX_JUMP_IFC_ON);
 375     break;
 376   case OPTION_IFC_LOOP:
 377     target_optimize = target_optimize | NDS32_RELAX_JUMP_IFC_ON;
 378     ifc_loop_aware = 1;
 379     break;
 380 #endif
 381 '
 382 LDEMUL_AFTER_OPEN=nds32_elf_after_open
 383 LDEMUL_AFTER_PARSE=nds32_elf_after_parse
 384 LDEMUL_AFTER_ALLOCATION=nds32_elf_after_allocation
 385 LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=nds32_elf_create_output_section_statements