bfd/coff-or32.c

   1 /* BFD back-end for OpenRISC 1000 COFF binaries.
   2    Copyright (C) 2002-2014 Free Software Foundation, Inc.
   3    Contributed by Ivan Guzvinec  <ivang@opencores.org>
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   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 #define OR32 1
  23
  24 #include "sysdep.h"
  25 #include "bfd.h"
  26 #include "libbfd.h"
  27 #include "coff/or32.h"
  28 #include "coff/internal.h"
  29 #include "libcoff.h"
  30
  31 static bfd_reloc_status_type or32_reloc
  32   (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
  33
  34 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
  35
  36 #define INSERT_HWORD(WORD,HWORD)              \
  37     (((WORD) & 0xffff0000) | ((HWORD)& 0x0000ffff))
  38 #define EXTRACT_HWORD(WORD)                   \
  39     ((WORD) & 0x0000ffff)
  40 #define SIGN_EXTEND_HWORD(HWORD)              \
  41     ((HWORD) & 0x8000 ? (HWORD)|(~0xffffL) : (HWORD))
  42
  43 #define INSERT_JUMPTARG(WORD,JT)              \
  44     (((WORD) & 0xfc000000) | ((JT)& 0x03ffffff))
  45 #define EXTRACT_JUMPTARG(WORD)                   \
  46     ((WORD) & 0x03ffffff)
  47 #define SIGN_EXTEND_JUMPTARG(JT)              \
  48     ((JT) & 0x04000000 ? (JT)|(~0x03ffffffL) : (JT))
  49
  50 /* Provided the symbol, returns the value reffed.  */
  51
  52 static long
  53 get_symbol_value (asymbol *symbol)
  54 {
  55   long relocation = 0;
  56
  57   if (bfd_is_com_section (symbol->section))
  58     relocation = 0;
  59   else
  60     relocation = symbol->value +
  61       symbol->section->output_section->vma +
  62       symbol->section->output_offset;
  63
  64   return relocation;
  65 }
  66
  67 /* This function is in charge of performing all the or32 relocations.  */
  68
  69 static bfd_reloc_status_type
  70 or32_reloc (bfd *abfd,
  71             arelent *reloc_entry,
  72             asymbol *symbol_in,
  73             void * data,
  74             asection *input_section,
  75             bfd *output_bfd,
  76             char **error_message)
  77 {
  78   /* The consth relocation comes in two parts, we have to remember
  79      the state between calls, in these variables.  */
  80   static bfd_boolean part1_consth_active = FALSE;
  81   static unsigned long part1_consth_value;
  82
  83   unsigned long insn;
  84   unsigned long sym_value;
  85   unsigned long unsigned_value;
  86   unsigned short r_type;
  87   long signed_value;
  88
  89   unsigned long addr = reloc_entry->address ;   /*+ input_section->vma*/
  90   bfd_byte *hit_data =addr + (bfd_byte *)(data);
  91
  92   r_type = reloc_entry->howto->type;
  93
  94   if (output_bfd)
  95     {
  96       /* Partial linking - do nothing.  */
  97       reloc_entry->address += input_section->output_offset;
  98       return bfd_reloc_ok;
  99     }
 100
 101   if (symbol_in != NULL
 102       && bfd_is_und_section (symbol_in->section))
 103     {
 104       /* Keep the state machine happy in case we're called again.  */
 105       if (r_type == R_IHIHALF)
 106         {
 107           part1_consth_active = TRUE;
 108           part1_consth_value  = 0;
 109         }
 110
 111       return bfd_reloc_undefined;
 112     }
 113
 114   if ((part1_consth_active) && (r_type != R_IHCONST))
 115     {
 116       part1_consth_active = FALSE;
 117       *error_message = (char *) "Missing IHCONST";
 118
 119       return bfd_reloc_dangerous;
 120     }
 121
 122   sym_value = get_symbol_value (symbol_in);
 123
 124   switch (r_type)
 125     {
 126     case R_IREL:
 127       insn = bfd_get_32(abfd, hit_data);
 128
 129       /* Take the value in the field and sign extend it.  */
 130       signed_value = EXTRACT_JUMPTARG (insn);
 131       signed_value = SIGN_EXTEND_JUMPTARG (signed_value);
 132       signed_value <<= 2;
 133
 134       /* See the note on the R_IREL reloc in coff_or32_relocate_section.  */
 135       if (signed_value == - (long) reloc_entry->address)
 136         signed_value = 0;
 137
 138       signed_value += sym_value + reloc_entry->addend;
 139       /* Relative jmp/call, so subtract from the value the
 140          address of the place we're coming from.  */
 141       signed_value -= (reloc_entry->address
 142                        + input_section->output_section->vma
 143                        + input_section->output_offset);
 144       if (signed_value > 0x7ffffff || signed_value < -0x8000000)
 145         return bfd_reloc_overflow;
 146
 147       signed_value >>= 2;
 148       insn = INSERT_JUMPTARG (insn, signed_value);
 149       bfd_put_32 (abfd, insn, hit_data);
 150       break;
 151
 152     case R_ILOHALF:
 153       insn = bfd_get_32 (abfd, hit_data);
 154       unsigned_value = EXTRACT_HWORD (insn);
 155       unsigned_value +=  sym_value + reloc_entry->addend;
 156       insn = INSERT_HWORD (insn, unsigned_value);
 157       bfd_put_32 (abfd, insn, hit_data);
 158       break;
 159
 160     case R_IHIHALF:
 161       insn = bfd_get_32 (abfd, hit_data);
 162
 163       /* consth, part 1
 164          Just get the symbol value that is referenced.  */
 165       part1_consth_active = TRUE;
 166       part1_consth_value = sym_value + reloc_entry->addend;
 167
 168       /* Don't modify insn until R_IHCONST.  */
 169       break;
 170
 171     case R_IHCONST:
 172       insn = bfd_get_32 (abfd, hit_data);
 173
 174       /* consth, part 2
 175          Now relocate the reference.  */
 176       if (! part1_consth_active)
 177         {
 178           *error_message = (char *) "Missing IHIHALF";
 179           return bfd_reloc_dangerous;
 180         }
 181
 182       /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
 183       unsigned_value = 0;   /*EXTRACT_HWORD(insn) << 16;*/
 184       unsigned_value += reloc_entry->addend; /* r_symndx */
 185       unsigned_value += part1_consth_value;
 186       unsigned_value = unsigned_value >> 16;
 187       insn = INSERT_HWORD (insn, unsigned_value);
 188       part1_consth_active = FALSE;
 189       bfd_put_32 (abfd, insn, hit_data);
 190       break;
 191
 192     case R_BYTE:
 193       insn = bfd_get_8 (abfd, hit_data);
 194       unsigned_value = insn + sym_value + reloc_entry->addend;
 195       if (unsigned_value & 0xffffff00)
 196         return bfd_reloc_overflow;
 197       bfd_put_8 (abfd, unsigned_value, hit_data);
 198       break;
 199
 200     case R_HWORD:
 201       insn = bfd_get_16 (abfd, hit_data);
 202       unsigned_value = insn + sym_value + reloc_entry->addend;
 203       if (unsigned_value & 0xffff0000)
 204         return bfd_reloc_overflow;
 205       bfd_put_16 (abfd, insn, hit_data);
 206       break;
 207
 208     case R_WORD:
 209       insn = bfd_get_32 (abfd, hit_data);
 210       insn += sym_value + reloc_entry->addend;
 211       bfd_put_32 (abfd, insn, hit_data);
 212       break;
 213
 214     default:
 215       *error_message = _("Unrecognized reloc");
 216       return bfd_reloc_dangerous;
 217     }
 218
 219   return bfd_reloc_ok;
 220 }
 221
 222 /*      type     rightshift
 223            size
 224         bitsize
 225              pc-relative
 226              bitpos
 227            absolute
 228                complain_on_overflow
 229               special_function
 230                 relocation name
 231                      partial_inplace
 232                       src_mask
 233 */
 234
 235 /* FIXME: I'm not real sure about this table.  */
 236 static reloc_howto_type howto_table[] =
 237 {
 238   { R_ABS,      0, 3, 32, FALSE,  0, complain_overflow_bitfield,  or32_reloc, "ABS",     TRUE, 0xffffffff,0xffffffff, FALSE },
 239     EMPTY_HOWTO (1),
 240     EMPTY_HOWTO (2),
 241     EMPTY_HOWTO (3),
 242     EMPTY_HOWTO (4),
 243     EMPTY_HOWTO (5),
 244     EMPTY_HOWTO (6),
 245     EMPTY_HOWTO (7),
 246     EMPTY_HOWTO (8),
 247     EMPTY_HOWTO (9),
 248     EMPTY_HOWTO (10),
 249     EMPTY_HOWTO (11),
 250     EMPTY_HOWTO (12),
 251     EMPTY_HOWTO (13),
 252     EMPTY_HOWTO (14),
 253     EMPTY_HOWTO (15),
 254     EMPTY_HOWTO (16),
 255     EMPTY_HOWTO (17),
 256     EMPTY_HOWTO (18),
 257     EMPTY_HOWTO (19),
 258     EMPTY_HOWTO (20),
 259     EMPTY_HOWTO (21),
 260     EMPTY_HOWTO (22),
 261     EMPTY_HOWTO (23),
 262   { R_IREL,     0, 3, 32, TRUE,   0, complain_overflow_signed,    or32_reloc, "IREL",    TRUE, 0xffffffff,0xffffffff, FALSE },
 263   { R_IABS,     0, 3, 32, FALSE,  0, complain_overflow_bitfield,  or32_reloc, "IABS",    TRUE, 0xffffffff,0xffffffff, FALSE },
 264   { R_ILOHALF,  0, 3, 16, TRUE,   0, complain_overflow_signed,    or32_reloc, "ILOHALF", TRUE, 0x0000ffff,0x0000ffff, FALSE },
 265   { R_IHIHALF,  0, 3, 16, TRUE,   16,complain_overflow_signed,    or32_reloc, "IHIHALF", TRUE, 0xffff0000,0xffff0000, FALSE },
 266   { R_IHCONST,  0, 3, 16, TRUE,   0, complain_overflow_signed,    or32_reloc, "IHCONST", TRUE, 0xffff0000,0xffff0000, FALSE },
 267   { R_BYTE,     0, 0, 8,  FALSE,  0, complain_overflow_bitfield,  or32_reloc, "BYTE",    TRUE, 0x000000ff,0x000000ff, FALSE },
 268   { R_HWORD,    0, 1, 16, FALSE,  0, complain_overflow_bitfield,  or32_reloc, "HWORD",   TRUE, 0x0000ffff,0x0000ffff, FALSE },
 269   { R_WORD,     0, 2, 32, FALSE,  0, complain_overflow_bitfield,  or32_reloc, "WORD",    TRUE, 0xffffffff,0xffffffff, FALSE },
 270 };
 271
 272 #define BADMAG(x) OR32BADMAG (x)
 273
 274 #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
 275   reloc_processing (relent, reloc, symbols, abfd, section)
 276
 277 static void
 278 reloc_processing (arelent *relent,
 279                   struct internal_reloc *reloc,
 280                   asymbol **symbols,
 281                   bfd *abfd,
 282                   asection *section)
 283 {
 284   static bfd_vma ihihalf_vaddr = (bfd_vma) -1;
 285
 286   relent->address = reloc->r_vaddr;
 287   relent->howto = howto_table + reloc->r_type;
 288
 289   if (reloc->r_type == R_IHCONST)
 290     {
 291       /* The address of an R_IHCONST should always be the address of
 292          the immediately preceding R_IHIHALF.  relocs generated by gas
 293          are correct, but relocs generated by High C are different (I
 294          can't figure out what the address means for High C).  We can
 295          handle both gas and High C by ignoring the address here, and
 296          simply reusing the address saved for R_IHIHALF.  */
 297       if (ihihalf_vaddr == (bfd_vma) -1)
 298         abort ();
 299
 300       relent->address = ihihalf_vaddr;
 301       ihihalf_vaddr = (bfd_vma) -1;
 302       relent->addend = reloc->r_symndx;
 303       relent->sym_ptr_ptr= bfd_abs_section_ptr->symbol_ptr_ptr;
 304     }
 305   else
 306     {
 307       relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 308       relent->addend = 0;
 309       relent->address-= section->vma;
 310
 311       if (reloc->r_type == R_IHIHALF)
 312         ihihalf_vaddr = relent->address;
 313       else if (ihihalf_vaddr != (bfd_vma) -1)
 314         abort ();
 315     }
 316 }
 317
 318 /* The reloc processing routine for the optimized COFF linker.  */
 319
 320 static bfd_boolean
 321 coff_or32_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
 322                             struct bfd_link_info *info,
 323                             bfd *input_bfd,
 324                             asection *input_section,
 325                             bfd_byte *contents,
 326                             struct internal_reloc *relocs,
 327                             struct internal_syment *syms,
 328                             asection **sections)
 329 {
 330   struct internal_reloc *rel;
 331   struct internal_reloc *relend;
 332   bfd_boolean hihalf;
 333   bfd_vma hihalf_val;
 334
 335   /* If we are performing a relocatable link, we don't need to do a
 336      thing.  The caller will take care of adjusting the reloc
 337      addresses and symbol indices.  */
 338   if (info->relocatable)
 339     return TRUE;
 340
 341   hihalf = FALSE;
 342   hihalf_val = 0;
 343
 344   rel = relocs;
 345   relend = rel + input_section->reloc_count;
 346
 347   for (; rel < relend; rel++)
 348     {
 349       long symndx;
 350       bfd_byte *loc;
 351       struct coff_link_hash_entry *h;
 352       struct internal_syment *sym;
 353       asection *sec;
 354       bfd_vma val;
 355       bfd_boolean overflow;
 356       unsigned long insn;
 357       long signed_value;
 358       unsigned long unsigned_value;
 359       bfd_reloc_status_type rstat;
 360
 361       symndx = rel->r_symndx;
 362       loc = contents + rel->r_vaddr - input_section->vma;
 363
 364       if (symndx == -1 || rel->r_type == R_IHCONST)
 365         h = NULL;
 366       else
 367         h = obj_coff_sym_hashes (input_bfd)[symndx];
 368
 369       sym = NULL;
 370       sec = NULL;
 371       val = 0;
 372
 373       /* An R_IHCONST reloc does not have a symbol.  Instead, the
 374          symbol index is an addend.  R_IHCONST is always used in
 375          conjunction with R_IHHALF.  */
 376       if (rel->r_type != R_IHCONST)
 377         {
 378           if (h == NULL)
 379             {
 380               if (symndx == -1)
 381                 sec = bfd_abs_section_ptr;
 382               else
 383                 {
 384                   sym = syms + symndx;
 385                   sec = sections[symndx];
 386                   val = (sec->output_section->vma
 387                          + sec->output_offset
 388                          + sym->n_value
 389                          - sec->vma);
 390                 }
 391             }
 392           else
 393             {
 394               if (h->root.type == bfd_link_hash_defined
 395                   || h->root.type == bfd_link_hash_defweak)
 396                 {
 397                   sec = h->root.u.def.section;
 398                   val = (h->root.u.def.value
 399                          + sec->output_section->vma
 400                          + sec->output_offset);
 401                 }
 402               else
 403                 {
 404                   if (! ((*info->callbacks->undefined_symbol)
 405                          (info, h->root.root.string, input_bfd, input_section,
 406                           rel->r_vaddr - input_section->vma, TRUE)))
 407                     return FALSE;
 408                 }
 409             }
 410
 411           if (hihalf)
 412             {
 413               if (! ((*info->callbacks->reloc_dangerous)
 414                      (info, "missing IHCONST reloc", input_bfd,
 415                       input_section, rel->r_vaddr - input_section->vma)))
 416                 return FALSE;
 417               hihalf = FALSE;
 418             }
 419         }
 420
 421       overflow = FALSE;
 422
 423       switch (rel->r_type)
 424         {
 425         default:
 426           bfd_set_error (bfd_error_bad_value);
 427           return FALSE;
 428
 429         case R_IREL:
 430           insn = bfd_get_32 (input_bfd, loc);
 431
 432           /* Extract the addend.  */
 433           signed_value = EXTRACT_JUMPTARG (insn);
 434           signed_value = SIGN_EXTEND_JUMPTARG (signed_value);
 435           signed_value <<= 2;
 436
 437           /* Determine the destination of the jump.  */
 438           signed_value += val;
 439
 440           /* Make the destination PC relative.  */
 441           signed_value -= (input_section->output_section->vma
 442                            + input_section->output_offset
 443                            + (rel->r_vaddr - input_section->vma));
 444           if (signed_value > 0x7ffffff || signed_value < - 0x8000000)
 445             {
 446               overflow = TRUE;
 447               signed_value = 0;
 448             }
 449
 450           /* Put the adjusted value back into the instruction.  */
 451           signed_value >>= 2;
 452           insn = INSERT_JUMPTARG(insn, signed_value);
 453
 454           bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
 455           break;
 456
 457         case R_ILOHALF:
 458           insn = bfd_get_32 (input_bfd, loc);
 459           unsigned_value = EXTRACT_HWORD (insn);
 460           unsigned_value += val;
 461           insn = INSERT_HWORD (insn, unsigned_value);
 462           bfd_put_32 (input_bfd, insn, loc);
 463           break;
 464
 465         case R_IHIHALF:
 466           /* Save the value for the R_IHCONST reloc.  */
 467           hihalf = TRUE;
 468           hihalf_val = val;
 469           break;
 470
 471         case R_IHCONST:
 472           if (! hihalf)
 473             {
 474               if (! ((*info->callbacks->reloc_dangerous)
 475                      (info, "missing IHIHALF reloc", input_bfd,
 476                       input_section, rel->r_vaddr - input_section->vma)))
 477                 return FALSE;
 478               hihalf_val = 0;
 479             }
 480
 481           insn = bfd_get_32 (input_bfd, loc);
 482           unsigned_value = rel->r_symndx + hihalf_val;
 483           unsigned_value >>= 16;
 484           insn = INSERT_HWORD (insn, unsigned_value);
 485           bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
 486
 487           hihalf = FALSE;
 488           break;
 489
 490         case R_BYTE:
 491         case R_HWORD:
 492         case R_WORD:
 493           rstat = _bfd_relocate_contents (howto_table + rel->r_type,
 494                                           input_bfd, val, loc);
 495           if (rstat == bfd_reloc_overflow)
 496             overflow = TRUE;
 497           else if (rstat != bfd_reloc_ok)
 498             abort ();
 499           break;
 500         }
 501
 502       if (overflow)
 503         {
 504           const char *name;
 505           char buf[SYMNMLEN + 1];
 506
 507           if (symndx == -1)
 508             name = "*ABS*";
 509           else if (h != NULL)
 510             name = NULL;
 511           else if (sym == NULL)
 512             name = "*unknown*";
 513           else if (sym->_n._n_n._n_zeroes == 0
 514                    && sym->_n._n_n._n_offset != 0)
 515             name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
 516           else
 517             {
 518               strncpy (buf, sym->_n._n_name, SYMNMLEN);
 519               buf[SYMNMLEN] = '\0';
 520               name = buf;
 521             }
 522
 523           if (! ((*info->callbacks->reloc_overflow)
 524                  (info, (h ? &h->root : NULL), name,
 525                   howto_table[rel->r_type].name, (bfd_vma) 0, input_bfd,
 526                   input_section, rel->r_vaddr - input_section->vma)))
 527             return FALSE;
 528         }
 529     }
 530
 531   return TRUE;
 532 }
 533
 534 #define coff_relocate_section coff_or32_relocate_section
 535
 536 /* We don't want to change the symndx of a R_IHCONST reloc, since it
 537    is actually an addend, not a symbol index at all.  */
 538
 539 static bfd_boolean
 540 coff_or32_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
 541                          struct bfd_link_info *info ATTRIBUTE_UNUSED,
 542                          bfd *ibfd ATTRIBUTE_UNUSED,
 543                          asection *sec ATTRIBUTE_UNUSED,
 544                          struct internal_reloc *irel,
 545                          bfd_boolean *adjustedp)
 546 {
 547   if (irel->r_type == R_IHCONST)
 548     *adjustedp = TRUE;
 549   else
 550     *adjustedp = FALSE;
 551   return TRUE;
 552 }
 553
 554 #define coff_adjust_symndx coff_or32_adjust_symndx
 555
 556 #ifndef bfd_pe_print_pdata
 557 #define bfd_pe_print_pdata      NULL
 558 #endif
 559
 560 #include "coffcode.h"
 561
 562 const bfd_target or32coff_big_vec =
 563 {
 564   "coff-or32-big",  /* Name.  */
 565   bfd_target_coff_flavour,
 566   BFD_ENDIAN_BIG,   /* Data byte order is big.  */
 567   BFD_ENDIAN_BIG,   /* Header byte order is big.  */
 568
 569   (HAS_RELOC  | EXEC_P |    /* Object flags.  */
 570    HAS_LINENO | HAS_DEBUG |
 571    HAS_SYMS   | HAS_LOCALS | WP_TEXT),
 572
 573   (SEC_HAS_CONTENTS | SEC_ALLOC | /* Section flags.  */
 574    SEC_LOAD | SEC_RELOC |
 575    SEC_READONLY ),
 576   '_',        /* Leading underscore.  */
 577   '/',        /* ar_pad_char.  */
 578   15,         /* ar_max_namelen.  */
 579   0,          /* match priority.  */
 580
 581   /* Data.  */
 582   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 583   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 584   bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 585
 586   /* Headers.  */
 587   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 588   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 589   bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 590
 591   {
 592     _bfd_dummy_target,
 593     coff_object_p,
 594     bfd_generic_archive_p,
 595     _bfd_dummy_target
 596   },
 597   {
 598     bfd_false,
 599     coff_mkobject,
 600     _bfd_generic_mkarchive,
 601     bfd_false
 602   },
 603   {
 604     bfd_false,
 605     coff_write_object_contents,
 606     _bfd_write_archive_contents,
 607     bfd_false
 608   },
 609
 610   BFD_JUMP_TABLE_GENERIC (coff),
 611   BFD_JUMP_TABLE_COPY (coff),
 612   BFD_JUMP_TABLE_CORE (_bfd_nocore),
 613   BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 614   BFD_JUMP_TABLE_SYMBOLS (coff),
 615   BFD_JUMP_TABLE_RELOCS (coff),
 616   BFD_JUMP_TABLE_WRITE (coff),
 617   BFD_JUMP_TABLE_LINK (coff),
 618   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 619
 620  /* Alternative_target.  */
 621 #ifdef TARGET_LITTLE_SYM
 622   & TARGET_LITTLE_SYM,
 623 #else
 624   NULL,
 625 #endif
 626
 627   COFF_SWAP_TABLE
 628 };