ld/emultempl/sh64elf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 2000, 2001, 2002, 2003, 2004, 2007, 2008
   3 #   Free Software Foundation, Inc.
   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 # This file is sourced from elf32.em, and defines extra sh64
  24 # specific routines.
  25 #
  26
  27 LDEMUL_AFTER_ALLOCATION=sh64_elf_${EMULATION_NAME}_after_allocation
  28 LDEMUL_BEFORE_ALLOCATION=sh64_elf_${EMULATION_NAME}_before_allocation
  29
  30 fragment <<EOF
  31
  32 #include "libiberty.h"
  33 #include "libbfd.h"
  34 #include "elf-bfd.h"
  35 #include "elf/sh.h"
  36 #include "elf32-sh64.h"
  37
  38 /* Check if we need a .cranges section and create it if it's not in any
  39    input file.  It might seem better to always create it and if unneeded,
  40    discard it, but I don't find a simple way to discard it totally from
  41    the output.
  42
  43    Putting it here instead of as a elf_backend_always_size_sections hook
  44    in elf32-sh64.c, means that we have access to linker command line
  45    options here, and we can access input sections in the order in which
  46    they will be linked.  */
  47
  48 static void
  49 sh64_elf_${EMULATION_NAME}_before_allocation (void)
  50 {
  51   asection *cranges;
  52   asection *osec;
  53
  54   /* Call main function; we're just extending it.  */
  55   gld${EMULATION_NAME}_before_allocation ();
  56
  57   cranges = bfd_get_section_by_name (link_info.output_bfd,
  58                                      SH64_CRANGES_SECTION_NAME);
  59
  60   if (cranges != NULL)
  61     {
  62       if (command_line.relax)
  63         {
  64           /* FIXME: Look through incoming sections with .cranges
  65              descriptors, build up some kind of descriptors that the
  66              relaxing function will pick up and adjust, or perhaps make it
  67              find and adjust an associated .cranges descriptor.  We could
  68              also look through incoming relocs and kill the ones marking
  69              relaxation areas, but that wouldn't be TRT.  */
  70           einfo
  71             (_("%P: Sorry, turning off relaxing: .cranges section in input.\n"));
  72           einfo (_(" A .cranges section is present in:\n"));
  73
  74           {
  75             LANG_FOR_EACH_INPUT_STATEMENT (f)
  76               {
  77                 asection *input_cranges
  78                   = bfd_get_section_by_name (f->the_bfd,
  79                                              SH64_CRANGES_SECTION_NAME);
  80                 if (input_cranges != NULL)
  81                   einfo (" %I\n", f);
  82               }
  83           }
  84
  85           command_line.relax = FALSE;
  86         }
  87
  88       /* We wouldn't need to do anything when there's already a .cranges
  89          section (and have a return here), except that we need to set the
  90          section flags right for output sections that *don't* need a
  91          .cranges section.  */
  92     }
  93
  94   if (command_line.relax)
  95     {
  96       LANG_FOR_EACH_INPUT_STATEMENT (f)
  97         {
  98           if (bfd_get_flavour (f->the_bfd) == bfd_target_elf_flavour)
  99             {
 100               asection *isec;
 101               for (isec = f->the_bfd->sections;
 102                    isec != NULL;
 103                    isec = isec->next)
 104                 {
 105                   if (elf_section_data (isec)->this_hdr.sh_flags
 106                       & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
 107                     {
 108                       einfo (_("%P: Sorry, turning off relaxing: SHmedia sections present.\n"));
 109                       einfo ("  %I\n", f);
 110                       command_line.relax = FALSE;
 111                       goto done_scanning_shmedia_sections;
 112                     }
 113                 }
 114             }
 115         }
 116     }
 117  done_scanning_shmedia_sections:
 118
 119   /* For each non-empty input section in each output section, check if it
 120      has the same SH64-specific flags.  If some input section differs, we
 121      need a .cranges section.  */
 122   for (osec = link_info.output_bfd->sections;
 123        osec != NULL;
 124        osec = osec->next)
 125     {
 126       struct sh64_section_data *sh64_sec_data;
 127       bfd_vma oflags_isa = 0;
 128       bfd_vma iflags_isa = 0;
 129
 130       if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour)
 131         einfo (_("%FError: non-ELF output formats are not supported by this target's linker.\n"));
 132
 133       sh64_sec_data = sh64_elf_section_data (osec)->sh64_info;
 134
 135       /* Omit excluded or garbage-collected sections.  */
 136       if (bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE)
 137         continue;
 138
 139       /* Make sure we have the target section data initialized.  */
 140       if (sh64_sec_data == NULL)
 141         {
 142           sh64_sec_data = xcalloc (1, sizeof (struct sh64_section_data));
 143           sh64_elf_section_data (osec)->sh64_info = sh64_sec_data;
 144         }
 145
 146       /* First find an input section so we have flags to compare with; the
 147          flags in the output section are not valid.  */
 148       {
 149         LANG_FOR_EACH_INPUT_STATEMENT (f)
 150           {
 151             asection *isec;
 152
 153             for (isec = f->the_bfd->sections;
 154                  isec != NULL;
 155                  isec = isec->next)
 156               {
 157                 if (isec->output_section == osec
 158                     && isec->size != 0
 159                     && (bfd_get_section_flags (isec->owner, isec)
 160                         & SEC_EXCLUDE) == 0)
 161                   {
 162                     oflags_isa
 163                       = (elf_section_data (isec)->this_hdr.sh_flags
 164                          & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
 165                     goto break_1;
 166                   }
 167               }
 168           }
 169       }
 170
 171     break_1:
 172
 173       /* Check that all input sections have the same contents-type flags
 174          as the first input section.  */
 175       {
 176         LANG_FOR_EACH_INPUT_STATEMENT (f)
 177           {
 178             asection *isec;
 179
 180             for (isec = f->the_bfd->sections;
 181                  isec != NULL;
 182                  isec = isec->next)
 183               {
 184                 if (isec->output_section == osec
 185                     && isec->size != 0
 186                     && (bfd_get_section_flags (isec->owner, isec)
 187                         & SEC_EXCLUDE) == 0)
 188                   {
 189                     iflags_isa
 190                       = (elf_section_data (isec)->this_hdr.sh_flags
 191                          & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
 192
 193                     /* If flags don't agree, we need a .cranges section.
 194                        Create it here if it did not exist through input
 195                        sections.  */
 196                     if (iflags_isa != oflags_isa)
 197                       {
 198                         if (cranges == NULL)
 199                           {
 200                             /* This section will be *appended* to
 201                                sections, so the outer iteration will reach
 202                                it in due time and set
 203                                sh64_elf_section_data; no need to set it
 204                                specifically here.  */
 205                             cranges
 206                               = bfd_make_section_with_flags (link_info.output_bfd,
 207                                                              SH64_CRANGES_SECTION_NAME,
 208                                                              SEC_LINKER_CREATED
 209                                                              | SEC_KEEP
 210                                                              | SEC_HAS_CONTENTS
 211                                                              | SEC_DEBUGGING);
 212                             if (cranges == NULL)
 213                               einfo
 214                                 (_("%P%E%F: Can't make .cranges section\n"));
 215                           }
 216
 217                         /* We don't need to look at more input sections,
 218                            and we know this section will have mixed
 219                            contents.  */
 220                         goto break_2;
 221                       }
 222                   }
 223               }
 224           }
 225       }
 226
 227       /* If we got here, then all input sections in this output section
 228          have the same contents flag.  Put that where we expect to see
 229          contents flags.  We don't need to do this for sections that will
 230          need additional, linker-generated .cranges entries.  */
 231       sh64_sec_data->contents_flags = iflags_isa;
 232
 233     break_2:
 234       ;
 235     }
 236 }
 237
 238 /* Size up and extend the .cranges section, merging generated entries.  */
 239
 240 static void
 241 sh64_elf_${EMULATION_NAME}_after_allocation (void)
 242 {
 243   bfd_vma new_cranges = 0;
 244   bfd_vma cranges_growth = 0;
 245   asection *osec;
 246   bfd_byte *crangesp;
 247
 248   asection *cranges = bfd_get_section_by_name (link_info.output_bfd,
 249                                                SH64_CRANGES_SECTION_NAME);
 250
 251   /* If this ever starts doing something, we will pick it up.  */
 252   after_allocation_default ();
 253
 254   /* If there is no .cranges section, it is because it was seen earlier on
 255      that none was needed.  Otherwise it must have been created then, or
 256      be present in input.  */
 257   if (cranges == NULL)
 258     return;
 259
 260   /* First, we set the ISA flags for each output section according to the
 261      first non-discarded section.  For each input section in osec, we
 262      check if it has the same flags.  If it does not, we set flags to mark
 263      a mixed section (and exit the loop early).  */
 264   for (osec = link_info.output_bfd->sections;
 265        osec != NULL;
 266        osec = osec->next)
 267     {
 268       bfd_vma oflags_isa = 0;
 269       bfd_boolean need_check_cranges = FALSE;
 270
 271       /* Omit excluded or garbage-collected sections.  */
 272       if (bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE)
 273         continue;
 274
 275       /* First find an input section so we have flags to compare with; the
 276          flags in the output section are not valid.  */
 277       {
 278         LANG_FOR_EACH_INPUT_STATEMENT (f)
 279           {
 280             asection *isec;
 281
 282             for (isec = f->the_bfd->sections;
 283                  isec != NULL;
 284                  isec = isec->next)
 285               {
 286                 if (isec->output_section == osec
 287                     && isec->size != 0
 288                     && (bfd_get_section_flags (isec->owner, isec)
 289                         & SEC_EXCLUDE) == 0)
 290                   {
 291                     oflags_isa
 292                       = (elf_section_data (isec)->this_hdr.sh_flags
 293                          & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
 294                     goto break_1;
 295                   }
 296               }
 297           }
 298       }
 299
 300     break_1:
 301
 302       /* Check that all input sections have the same contents-type flags
 303          as the first input section.  */
 304       {
 305         LANG_FOR_EACH_INPUT_STATEMENT (f)
 306           {
 307             asection *isec;
 308
 309             for (isec = f->the_bfd->sections;
 310                  isec != NULL;
 311                  isec = isec->next)
 312               {
 313                 if (isec->output_section == osec
 314                     && isec->size != 0
 315                     && (bfd_get_section_flags (isec->owner, isec)
 316                         & SEC_EXCLUDE) == 0)
 317                   {
 318                     bfd_vma iflags_isa
 319                       = (elf_section_data (isec)->this_hdr.sh_flags
 320                          & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
 321
 322                     /* If flags don't agree, set the target-specific data
 323                        of the section to mark that this section needs to
 324                        be have .cranges section entries added.  Don't
 325                        bother setting ELF section flags in output section;
 326                        they will be cleared later and will have to be
 327                        re-initialized before the linked file is written.  */
 328                     if (iflags_isa != oflags_isa)
 329                       {
 330                         oflags_isa = SHF_SH5_ISA32_MIXED;
 331
 332                         BFD_ASSERT (sh64_elf_section_data (osec)->sh64_info);
 333
 334                         sh64_elf_section_data (osec)->sh64_info->contents_flags
 335                           = SHF_SH5_ISA32_MIXED;
 336                         need_check_cranges = TRUE;
 337                         goto break_2;
 338                       }
 339                   }
 340               }
 341           }
 342       }
 343
 344     break_2:
 345
 346       /* If there were no new ranges for this output section, we don't
 347          need to iterate over the input sections to check how many are
 348          needed.  */
 349       if (! need_check_cranges)
 350         continue;
 351
 352       /* If we found a section with differing contents type, we need more
 353          ranges to mark the sections that are not mixed (and already have
 354          .cranges descriptors).  Calculate the maximum number of new
 355          entries here.  We may merge some of them, so that number is not
 356          final; it can shrink.  */
 357       {
 358         LANG_FOR_EACH_INPUT_STATEMENT (f)
 359           {
 360             asection *isec;
 361
 362             for (isec = f->the_bfd->sections;
 363                  isec != NULL;
 364                  isec = isec->next)
 365               {
 366                 if (isec->output_section == osec
 367                     && isec->size != 0
 368                     && (bfd_get_section_flags (isec->owner, isec)
 369                         & SEC_EXCLUDE) == 0
 370                     && ((elf_section_data (isec)->this_hdr.sh_flags
 371                          & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
 372                         != SHF_SH5_ISA32_MIXED))
 373                   new_cranges++;
 374               }
 375           }
 376       }
 377     }
 378
 379   /* ldemul_after_allocation may be called twice.  First directly from
 380      lang_process, and the second time when lang_process calls ldemul_finish,
 381      which calls gld${EMULATION_NAME}_finish, e.g. gldshelf32_finish, which
 382      is defined in emultempl/elf32.em and calls ldemul_after_allocation,
 383      if bfd_elf_discard_info returned true.  */
 384   if (cranges->contents != NULL)
 385     free (cranges->contents);
 386
 387   BFD_ASSERT (sh64_elf_section_data (cranges)->sh64_info != NULL);
 388
 389   /* Make sure we have .cranges in memory even if there were only
 390      assembler-generated .cranges.  */
 391   cranges_growth = new_cranges * SH64_CRANGE_SIZE;
 392   cranges->contents = xcalloc (cranges->size + cranges_growth, 1);
 393   bfd_set_section_flags (cranges->owner, cranges,
 394                          bfd_get_section_flags (cranges->owner, cranges)
 395                          | SEC_IN_MEMORY);
 396
 397   /* If we don't need to grow the .cranges section beyond what was in the
 398      input sections, we have nothing more to do here.  We then only got
 399      here because there was a .cranges section coming from input.  Zero
 400      out the number of generated .cranges.  */
 401   if (new_cranges == 0)
 402     {
 403       sh64_elf_section_data (cranges)->sh64_info->cranges_growth = 0;
 404       return;
 405     }
 406
 407   crangesp = cranges->contents + cranges->size;
 408
 409   /* Now pass over the sections again, and make reloc orders for the new
 410      .cranges entries.  Constants are set as we go.  */
 411   for (osec = link_info.output_bfd->sections;
 412        osec != NULL;
 413        osec = osec->next)
 414     {
 415       struct bfd_link_order *cr_addr_order = NULL;
 416       enum sh64_elf_cr_type last_cr_type = CRT_NONE;
 417       bfd_vma last_cr_size = 0;
 418       bfd_vma continuation_vma = 0;
 419
 420       /* Omit excluded or garbage-collected sections, and output sections
 421          which were not marked as needing further processing.  */
 422       if ((bfd_get_section_flags (link_info.output_bfd, osec) & SEC_EXCLUDE) != 0
 423           || (sh64_elf_section_data (osec)->sh64_info->contents_flags
 424               != SHF_SH5_ISA32_MIXED))
 425         continue;
 426
 427       {
 428         LANG_FOR_EACH_INPUT_STATEMENT (f)
 429           {
 430             asection *isec;
 431
 432             for (isec = f->the_bfd->sections;
 433                  isec != NULL;
 434                  isec = isec->next)
 435               {
 436                 /* Allow only sections that have (at least initially) a
 437                    non-zero size, and are not excluded, and are not marked
 438                    as containing mixed data, thus already having .cranges
 439                    entries.  */
 440                 if (isec->output_section == osec
 441                     && isec->size != 0
 442                     && (bfd_get_section_flags (isec->owner, isec)
 443                         & SEC_EXCLUDE) == 0
 444                     && ((elf_section_data (isec)->this_hdr.sh_flags
 445                          & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED))
 446                         != SHF_SH5_ISA32_MIXED))
 447                   {
 448                     enum sh64_elf_cr_type cr_type;
 449                     bfd_vma cr_size;
 450                     bfd_vma isa_flags
 451                       = (elf_section_data (isec)->this_hdr.sh_flags
 452                          & (SHF_SH5_ISA32 | SHF_SH5_ISA32_MIXED));
 453
 454                     if (isa_flags == SHF_SH5_ISA32)
 455                       cr_type = CRT_SH5_ISA32;
 456                     else if ((bfd_get_section_flags (isec->owner, isec)
 457                               & SEC_CODE) == 0)
 458                       cr_type = CRT_DATA;
 459                     else
 460                       cr_type = CRT_SH5_ISA16;
 461
 462                     cr_size = isec->size;
 463
 464                     /* Sections can be empty, like .text in a file that
 465                        only contains other sections.  Ranges shouldn't be
 466                        emitted for them.  This can presumably happen after
 467                        relaxing and is not be caught at the "raw size"
 468                        test above.  */
 469                     if (cr_size == 0)
 470                       continue;
 471
 472                     /* See if this is a continuation of the previous range
 473                        for the same output section.  If so, just change
 474                        the size of the last range and continue.  */
 475                     if (cr_type == last_cr_type
 476                         && (continuation_vma
 477                             == osec->vma + isec->output_offset))
 478                       {
 479                         last_cr_size += cr_size;
 480                         bfd_put_32 (link_info.output_bfd, last_cr_size,
 481                                     crangesp - SH64_CRANGE_SIZE
 482                                     + SH64_CRANGE_CR_SIZE_OFFSET);
 483
 484                         continuation_vma += cr_size;
 485                         continue;
 486                       }
 487
 488                     /* If we emit relocatable contents, we need a
 489                        relocation for the start address.  */
 490                     if (link_info.relocatable || link_info.emitrelocations)
 491                       {
 492                         /* FIXME: We could perhaps use lang_add_reloc and
 493                            friends here, but I'm not really sure that
 494                            would leave us free to do some optimizations
 495                            later.  */
 496                         cr_addr_order
 497                           = bfd_new_link_order (link_info.output_bfd, cranges);
 498
 499                         if (cr_addr_order == NULL)
 500                           {
 501                             einfo (_("%P%F: bfd_new_link_order failed\n"));
 502                             return;
 503                           }
 504
 505                         cr_addr_order->type = bfd_section_reloc_link_order;
 506                         cr_addr_order->offset
 507                           = (cranges->output_offset
 508                              + crangesp + SH64_CRANGE_CR_ADDR_OFFSET
 509                              - cranges->contents);
 510                         cr_addr_order->size = 4;
 511                         cr_addr_order->u.reloc.p
 512                           = xmalloc (sizeof (struct bfd_link_order_reloc));
 513
 514                         cr_addr_order->u.reloc.p->reloc = BFD_RELOC_32;
 515                         cr_addr_order->u.reloc.p->u.section = osec;
 516
 517                         /* Since SH, unlike normal RELA-targets, uses a
 518                            "partial inplace" REL-like relocation for this,
 519                            we put the addend in the contents and specify 0
 520                            for the reloc.  */
 521                         bfd_put_32 (link_info.output_bfd, isec->output_offset,
 522                                     crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
 523                         cr_addr_order->u.reloc.p->addend = 0;
 524                       }
 525                     else
 526                       bfd_put_32 (link_info.output_bfd,
 527                                   osec->vma + isec->output_offset,
 528                                   crangesp + SH64_CRANGE_CR_ADDR_OFFSET);
 529
 530                     /* If we could make a reloc for cr_size we would do
 531                        it, but we would have to have a symbol for the size
 532                        of the _input_ section and there's no way to
 533                        generate that.  */
 534                     bfd_put_32 (link_info.output_bfd, cr_size,
 535                                 crangesp + SH64_CRANGE_CR_SIZE_OFFSET);
 536
 537                     bfd_put_16 (link_info.output_bfd, cr_type,
 538                                 crangesp + SH64_CRANGE_CR_TYPE_OFFSET);
 539
 540                     last_cr_type = cr_type;
 541                     last_cr_size = cr_size;
 542                     continuation_vma
 543                       = osec->vma + isec->output_offset + cr_size;
 544                     crangesp += SH64_CRANGE_SIZE;
 545                   }
 546               }
 547           }
 548       }
 549     }
 550
 551   /* The .cranges section will have this size, no larger or smaller.
 552      Since relocs (if relocatable linking) will be emitted into the
 553      "extended" size, we must set the raw size to the total.  We have to
 554      keep track of the number of new .cranges entries.
 555
 556      Sorting before writing is done by sh64_elf_final_write_processing.  */
 557
 558   sh64_elf_section_data (cranges)->sh64_info->cranges_growth
 559     = crangesp - cranges->contents - cranges->size;
 560   cranges->size = crangesp - cranges->contents;
 561   cranges->rawsize = cranges->size;
 562 }