bfd/coff-or32.c

   1 /* BFD back-end for OpenRISC 1000 COFF binaries.
   2    Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2011, 2012
   3    Free Software Foundation, Inc.
   4    Contributed by Ivan Guzvinec  <ivang@opencores.org>
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   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 3 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,
  21    MA 02110-1301, USA.  */
  22
  23 #define OR32 1
  24
  25 #include "sysdep.h"
  26 #include "bfd.h"
  27 #include "libbfd.h"
  28 #include "coff/or32.h"
  29 #include "coff/internal.h"
  30 #include "libcoff.h"
  31
  32 static bfd_reloc_status_type or32_reloc
  33   (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
  34
  35 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
  36
  37 #define INSERT_HWORD(WORD,HWORD)              \
  38     (((WORD) & 0xffff0000) | ((HWORD)& 0x0000ffff))
  39 #define EXTRACT_HWORD(WORD)                   \
  40     ((WORD) & 0x0000ffff)
  41 #define SIGN_EXTEND_HWORD(HWORD)              \
  42     ((HWORD) & 0x8000 ? (HWORD)|(~0xffffL) : (HWORD))
  43
  44 #define INSERT_JUMPTARG(WORD,JT)              \
  45     (((WORD) & 0xfc000000) | ((JT)& 0x03ffffff))
  46 #define EXTRACT_JUMPTARG(WORD)                   \
  47     ((WORD) & 0x03ffffff)
  48 #define SIGN_EXTEND_JUMPTARG(JT)              \
  49     ((JT) & 0x04000000 ? (JT)|(~0x03ffffffL) : (JT))
  50
  51 /* Provided the symbol, returns the value reffed.  */
  52
  53 static long
  54 get_symbol_value (asymbol *symbol)
  55 {
  56   long relocation = 0;
  57
  58   if (bfd_is_com_section (symbol->section))
  59     relocation = 0;
  60   else
  61     relocation = symbol->value +
  62       symbol->section->output_section->vma +
  63       symbol->section->output_offset;
  64
  65   return relocation;
  66 }
  67
  68 /* This function is in charge of performing all the or32 relocations.  */
  69
  70 static bfd_reloc_status_type
  71 or32_reloc (bfd *abfd,
  72             arelent *reloc_entry,
  73             asymbol *symbol_in,
  74             void * data,
  75             asection *input_section,
  76             bfd *output_bfd,
  77             char **error_message)
  78 {
  79   /* The consth relocation comes in two parts, we have to remember
  80      the state between calls, in these variables.  */
  81   static bfd_boolean part1_consth_active = FALSE;
  82   static unsigned long part1_consth_value;
  83
  84   unsigned long insn;
  85   unsigned long sym_value;
  86   unsigned long unsigned_value;
  87   unsigned short r_type;
  88   long signed_value;
  89
  90   unsigned long addr = reloc_entry->address ;   /*+ input_section->vma*/
  91   bfd_byte *hit_data =addr + (bfd_byte *)(data);
  92
  93   r_type = reloc_entry->howto->type;
  94
  95   if (output_bfd)
  96     {
  97       /* Partial linking - do nothing.  */
  98       reloc_entry->address += input_section->output_offset;
  99       return bfd_reloc_ok;
 100     }
 101
 102   if (symbol_in != NULL
 103       && bfd_is_und_section (symbol_in->section))
 104     {
 105       /* Keep the state machine happy in case we're called again.  */
 106       if (r_type == R_IHIHALF)
 107         {
 108           part1_consth_active = TRUE;
 109           part1_consth_value  = 0;
 110         }
 111
 112       return bfd_reloc_undefined;
 113     }
 114
 115   if ((part1_consth_active) && (r_type != R_IHCONST))
 116     {
 117       part1_consth_active = FALSE;
 118       *error_message = (char *) "Missing IHCONST";
 119
 120       return bfd_reloc_dangerous;
 121     }
 122
 123   sym_value = get_symbol_value (symbol_in);
 124
 125   switch (r_type)
 126     {
 127     case R_IREL:
 128       insn = bfd_get_32(abfd, hit_data);
 129
 130       /* Take the value in the field and sign extend it.  */
 131       signed_value = EXTRACT_JUMPTARG (insn);
 132       signed_value = SIGN_EXTEND_JUMPTARG (signed_value);
 133       signed_value <<= 2;
 134
 135       /* See the note on the R_IREL reloc in coff_or32_relocate_section.  */
 136       if (signed_value == - (long) reloc_entry->address)
 137         signed_value = 0;
 138
 139       signed_value += sym_value + reloc_entry->addend;
 140       /* Relative jmp/call, so subtract from the value the
 141          address of the place we're coming from.  */
 142       signed_value -= (reloc_entry->address
 143                        + input_section->output_section->vma
 144                        + input_section->output_offset);
 145       if (signed_value > 0x7ffffff || signed_value < -0x8000000)
 146         return bfd_reloc_overflow;
 147
 148       signed_value >>= 2;
 149       insn = INSERT_JUMPTARG (insn, signed_value);
 150       bfd_put_32 (abfd, insn, hit_data);
 151       break;
 152
 153     case R_ILOHALF:
 154       insn = bfd_get_32 (abfd, hit_data);
 155       unsigned_value = EXTRACT_HWORD (insn);
 156       unsigned_value +=  sym_value + reloc_entry->addend;
 157       insn = INSERT_HWORD (insn, unsigned_value);
 158       bfd_put_32 (abfd, insn, hit_data);
 159       break;
 160
 161     case R_IHIHALF:
 162       insn = bfd_get_32 (abfd, hit_data);
 163
 164       /* consth, part 1
 165          Just get the symbol value that is referenced.  */
 166       part1_consth_active = TRUE;
 167       part1_consth_value = sym_value + reloc_entry->addend;
 168
 169       /* Don't modify insn until R_IHCONST.  */
 170       break;
 171
 172     case R_IHCONST:
 173       insn = bfd_get_32 (abfd, hit_data);
 174
 175       /* consth, part 2
 176          Now relocate the reference.  */
 177       if (! part1_consth_active)
 178         {
 179           *error_message = (char *) "Missing IHIHALF";
 180           return bfd_reloc_dangerous;
 181         }
 182
 183       /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
 184       unsigned_value = 0;   /*EXTRACT_HWORD(insn) << 16;*/
 185       unsigned_value += reloc_entry->addend; /* r_symndx */
 186       unsigned_value += part1_consth_value;
 187       unsigned_value = unsigned_value >> 16;
 188       insn = INSERT_HWORD (insn, unsigned_value);
 189       part1_consth_active = FALSE;
 190       bfd_put_32 (abfd, insn, hit_data);
 191       break;
 192
 193     case R_BYTE:
 194       insn = bfd_get_8 (abfd, hit_data);
 195       unsigned_value = insn + sym_value + reloc_entry->addend;
 196       if (unsigned_value & 0xffffff00)
 197         return bfd_reloc_overflow;
 198       bfd_put_8 (abfd, unsigned_value, hit_data);
 199       break;
 200
 201     case R_HWORD:
 202       insn = bfd_get_16 (abfd, hit_data);
 203       unsigned_value = insn + sym_value + reloc_entry->addend;
 204       if (unsigned_value & 0xffff0000)
 205         return bfd_reloc_overflow;
 206       bfd_put_16 (abfd, insn, hit_data);
 207       break;
 208
 209     case R_WORD:
 210       insn = bfd_get_32 (abfd, hit_data);
 211       insn += sym_value + reloc_entry->addend;
 212       bfd_put_32 (abfd, insn, hit_data);
 213       break;
 214
 215     default:
 216       *error_message = _("Unrecognized reloc");
 217       return bfd_reloc_dangerous;
 218     }
 219
 220   return bfd_reloc_ok;
 221 }
 222
 223 /*      type     rightshift
 224            size
 225         bitsize
 226              pc-relative
 227              bitpos
 228            absolute
 229                complain_on_overflow
 230               special_function
 231                 relocation name
 232                      partial_inplace
 233                       src_mask
 234 */
 235
 236 /* FIXME: I'm not real sure about this table.  */
 237 static reloc_howto_type howto_table[] =
 238 {
 239   { R_ABS,      0, 3, 32, FALSE,  0, complain_overflow_bitfield,  or32_reloc, "ABS",     TRUE, 0xffffffff,0xffffffff, FALSE },
 240     EMPTY_HOWTO (1),
 241     EMPTY_HOWTO (2),
 242     EMPTY_HOWTO (3),
 243     EMPTY_HOWTO (4),
 244     EMPTY_HOWTO (5),
 245     EMPTY_HOWTO (6),
 246     EMPTY_HOWTO (7),
 247     EMPTY_HOWTO (8),
 248     EMPTY_HOWTO (9),
 249     EMPTY_HOWTO (10),
 250     EMPTY_HOWTO (11),
 251     EMPTY_HOWTO (12),
 252     EMPTY_HOWTO (13),
 253     EMPTY_HOWTO (14),
 254     EMPTY_HOWTO (15),
 255     EMPTY_HOWTO (16),
 256     EMPTY_HOWTO (17),
 257     EMPTY_HOWTO (18),
 258     EMPTY_HOWTO (19),
 259     EMPTY_HOWTO (20),
 260     EMPTY_HOWTO (21),
 261     EMPTY_HOWTO (22),
 262     EMPTY_HOWTO (23),
 263   { R_IREL,     0, 3, 32, TRUE,   0, complain_overflow_signed,    or32_reloc, "IREL",    TRUE, 0xffffffff,0xffffffff, FALSE },
 264   { R_IABS,     0, 3, 32, FALSE,  0, complain_overflow_bitfield,  or32_reloc, "IABS",    TRUE, 0xffffffff,0xffffffff, FALSE },
 265   { R_ILOHALF,  0, 3, 16, TRUE,   0, complain_overflow_signed,    or32_reloc, "ILOHALF", TRUE, 0x0000ffff,0x0000ffff, FALSE },
 266   { R_IHIHALF,  0, 3, 16, TRUE,   16,complain_overflow_signed,    or32_reloc, "IHIHALF", TRUE, 0xffff0000,0xffff0000, FALSE },
 267   { R_IHCONST,  0, 3, 16, TRUE,   0, complain_overflow_signed,    or32_reloc, "IHCONST", TRUE, 0xffff0000,0xffff0000, FALSE },
 268   { R_BYTE,     0, 0, 8,  FALSE,  0, complain_overflow_bitfield,  or32_reloc, "BYTE",    TRUE, 0x000000ff,0x000000ff, FALSE },
 269   { R_HWORD,    0, 1, 16, FALSE,  0, complain_overflow_bitfield,  or32_reloc, "HWORD",   TRUE, 0x0000ffff,0x0000ffff, FALSE },
 270   { R_WORD,     0, 2, 32, FALSE,  0, complain_overflow_bitfield,  or32_reloc, "WORD",    TRUE, 0xffffffff,0xffffffff, FALSE },
 271 };
 272
 273 #define BADMAG(x) OR32BADMAG (x)
 274
 275 #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
 276   reloc_processing (relent, reloc, symbols, abfd, section)
 277
 278 static void
 279 reloc_processing (arelent *relent,
 280                   struct internal_reloc *reloc,
 281                   asymbol **symbols,
 282                   bfd *abfd,
 283                   asection *section)
 284 {
 285   static bfd_vma ihihalf_vaddr = (bfd_vma) -1;
 286
 287   relent->address = reloc->r_vaddr;
 288   relent->howto = howto_table + reloc->r_type;
 289
 290   if (reloc->r_type == R_IHCONST)
 291     {
 292       /* The address of an R_IHCONST should always be the address of
 293          the immediately preceding R_IHIHALF.  relocs generated by gas
 294          are correct, but relocs generated by High C are different (I
 295          can't figure out what the address means for High C).  We can
 296          handle both gas and High C by ignoring the address here, and
 297          simply reusing the address saved for R_IHIHALF.  */
 298       if (ihihalf_vaddr == (bfd_vma) -1)
 299         abort ();
 300
 301       relent->address = ihihalf_vaddr;
 302       ihihalf_vaddr = (bfd_vma) -1;
 303       relent->addend = reloc->r_symndx;
 304       relent->sym_ptr_ptr= bfd_abs_section_ptr->symbol_ptr_ptr;
 305     }
 306   else
 307     {
 308       relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 309       relent->addend = 0;
 310       relent->address-= section->vma;
 311
 312       if (reloc->r_type == R_IHIHALF)
 313         ihihalf_vaddr = relent->address;
 314       else if (ihihalf_vaddr != (bfd_vma) -1)
 315         abort ();
 316     }
 317 }
 318
 319 /* The reloc processing routine for the optimized COFF linker.  */
 320
 321 static bfd_boolean
 322 coff_or32_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED,
 323                             struct bfd_link_info *info,
 324                             bfd *input_bfd,
 325                             asection *input_section,
 326                             bfd_byte *contents,
 327                             struct internal_reloc *relocs,
 328                             struct internal_syment *syms,
 329                             asection **sections)
 330 {
 331   struct internal_reloc *rel;
 332   struct internal_reloc *relend;
 333   bfd_boolean hihalf;
 334   bfd_vma hihalf_val;
 335
 336   /* If we are performing a relocatable link, we don't need to do a
 337      thing.  The caller will take care of adjusting the reloc
 338      addresses and symbol indices.  */
 339   if (info->relocatable)
 340     return TRUE;
 341
 342   hihalf = FALSE;
 343   hihalf_val = 0;
 344
 345   rel = relocs;
 346   relend = rel + input_section->reloc_count;
 347
 348   for (; rel < relend; rel++)
 349     {
 350       long symndx;
 351       bfd_byte *loc;
 352       struct coff_link_hash_entry *h;
 353       struct internal_syment *sym;
 354       asection *sec;
 355       bfd_vma val;
 356       bfd_boolean overflow;
 357       unsigned long insn;
 358       long signed_value;
 359       unsigned long unsigned_value;
 360       bfd_reloc_status_type rstat;
 361
 362       symndx = rel->r_symndx;
 363       loc = contents + rel->r_vaddr - input_section->vma;
 364
 365       if (symndx == -1 || rel->r_type == R_IHCONST)
 366         h = NULL;
 367       else
 368         h = obj_coff_sym_hashes (input_bfd)[symndx];
 369
 370       sym = NULL;
 371       sec = NULL;
 372       val = 0;
 373
 374       /* An R_IHCONST reloc does not have a symbol.  Instead, the
 375          symbol index is an addend.  R_IHCONST is always used in
 376          conjunction with R_IHHALF.  */
 377       if (rel->r_type != R_IHCONST)
 378         {
 379           if (h == NULL)
 380             {
 381               if (symndx == -1)
 382                 sec = bfd_abs_section_ptr;
 383               else
 384                 {
 385                   sym = syms + symndx;
 386                   sec = sections[symndx];
 387                   val = (sec->output_section->vma
 388                          + sec->output_offset
 389                          + sym->n_value
 390                          - sec->vma);
 391                 }
 392             }
 393           else
 394             {
 395               if (h->root.type == bfd_link_hash_defined
 396                   || h->root.type == bfd_link_hash_defweak)
 397                 {
 398                   sec = h->root.u.def.section;
 399                   val = (h->root.u.def.value
 400                          + sec->output_section->vma
 401                          + sec->output_offset);
 402                 }
 403               else
 404                 {
 405                   if (! ((*info->callbacks->undefined_symbol)
 406                          (info, h->root.root.string, input_bfd, input_section,
 407                           rel->r_vaddr - input_section->vma, TRUE)))
 408                     return FALSE;
 409                 }
 410             }
 411
 412           if (hihalf)
 413             {
 414               if (! ((*info->callbacks->reloc_dangerous)
 415                      (info, "missing IHCONST reloc", input_bfd,
 416                       input_section, rel->r_vaddr - input_section->vma)))
 417                 return FALSE;
 418               hihalf = FALSE;
 419             }
 420         }
 421
 422       overflow = FALSE;
 423
 424       switch (rel->r_type)
 425         {
 426         default:
 427           bfd_set_error (bfd_error_bad_value);
 428           return FALSE;
 429
 430         case R_IREL:
 431           insn = bfd_get_32 (input_bfd, loc);
 432
 433           /* Extract the addend.  */
 434           signed_value = EXTRACT_JUMPTARG (insn);
 435           signed_value = SIGN_EXTEND_JUMPTARG (signed_value);
 436           signed_value <<= 2;
 437
 438           /* Determine the destination of the jump.  */
 439           signed_value += val;
 440
 441           /* Make the destination PC relative.  */
 442           signed_value -= (input_section->output_section->vma
 443                            + input_section->output_offset
 444                            + (rel->r_vaddr - input_section->vma));
 445           if (signed_value > 0x7ffffff || signed_value < - 0x8000000)
 446             {
 447               overflow = TRUE;
 448               signed_value = 0;
 449             }
 450
 451           /* Put the adjusted value back into the instruction.  */
 452           signed_value >>= 2;
 453           insn = INSERT_JUMPTARG(insn, signed_value);
 454
 455           bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
 456           break;
 457
 458         case R_ILOHALF:
 459           insn = bfd_get_32 (input_bfd, loc);
 460           unsigned_value = EXTRACT_HWORD (insn);
 461           unsigned_value += val;
 462           insn = INSERT_HWORD (insn, unsigned_value);
 463           bfd_put_32 (input_bfd, insn, loc);
 464           break;
 465
 466         case R_IHIHALF:
 467           /* Save the value for the R_IHCONST reloc.  */
 468           hihalf = TRUE;
 469           hihalf_val = val;
 470           break;
 471
 472         case R_IHCONST:
 473           if (! hihalf)
 474             {
 475               if (! ((*info->callbacks->reloc_dangerous)
 476                      (info, "missing IHIHALF reloc", input_bfd,
 477                       input_section, rel->r_vaddr - input_section->vma)))
 478                 return FALSE;
 479               hihalf_val = 0;
 480             }
 481
 482           insn = bfd_get_32 (input_bfd, loc);
 483           unsigned_value = rel->r_symndx + hihalf_val;
 484           unsigned_value >>= 16;
 485           insn = INSERT_HWORD (insn, unsigned_value);
 486           bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
 487
 488           hihalf = FALSE;
 489           break;
 490
 491         case R_BYTE:
 492         case R_HWORD:
 493         case R_WORD:
 494           rstat = _bfd_relocate_contents (howto_table + rel->r_type,
 495                                           input_bfd, val, loc);
 496           if (rstat == bfd_reloc_overflow)
 497             overflow = TRUE;
 498           else if (rstat != bfd_reloc_ok)
 499             abort ();
 500           break;
 501         }
 502
 503       if (overflow)
 504         {
 505           const char *name;
 506           char buf[SYMNMLEN + 1];
 507
 508           if (symndx == -1)
 509             name = "*ABS*";
 510           else if (h != NULL)
 511             name = NULL;
 512           else if (sym == NULL)
 513             name = "*unknown*";
 514           else if (sym->_n._n_n._n_zeroes == 0
 515                    && sym->_n._n_n._n_offset != 0)
 516             name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
 517           else
 518             {
 519               strncpy (buf, sym->_n._n_name, SYMNMLEN);
 520               buf[SYMNMLEN] = '\0';
 521               name = buf;
 522             }
 523
 524           if (! ((*info->callbacks->reloc_overflow)
 525                  (info, (h ? &h->root : NULL), name,
 526                   howto_table[rel->r_type].name, (bfd_vma) 0, input_bfd,
 527                   input_section, rel->r_vaddr - input_section->vma)))
 528             return FALSE;
 529         }
 530     }
 531
 532   return TRUE;
 533 }
 534
 535 #define coff_relocate_section coff_or32_relocate_section
 536
 537 /* We don't want to change the symndx of a R_IHCONST reloc, since it
 538    is actually an addend, not a symbol index at all.  */
 539
 540 static bfd_boolean
 541 coff_or32_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
 542                          struct bfd_link_info *info ATTRIBUTE_UNUSED,
 543                          bfd *ibfd ATTRIBUTE_UNUSED,
 544                          asection *sec ATTRIBUTE_UNUSED,
 545                          struct internal_reloc *irel,
 546                          bfd_boolean *adjustedp)
 547 {
 548   if (irel->r_type == R_IHCONST)
 549     *adjustedp = TRUE;
 550   else
 551     *adjustedp = FALSE;
 552   return TRUE;
 553 }
 554
 555 #define coff_adjust_symndx coff_or32_adjust_symndx
 556
 557 #ifndef bfd_pe_print_pdata
 558 #define bfd_pe_print_pdata      NULL
 559 #endif
 560
 561 #include "coffcode.h"
 562
 563 const bfd_target or32coff_big_vec =
 564 {
 565   "coff-or32-big",  /* Name.  */
 566   bfd_target_coff_flavour,
 567   BFD_ENDIAN_BIG,   /* Data byte order is big.  */
 568   BFD_ENDIAN_BIG,   /* Header byte order is big.  */
 569
 570   (HAS_RELOC  | EXEC_P |    /* Object flags.  */
 571    HAS_LINENO | HAS_DEBUG |
 572    HAS_SYMS   | HAS_LOCALS | WP_TEXT),
 573
 574   (SEC_HAS_CONTENTS | SEC_ALLOC | /* Section flags.  */
 575    SEC_LOAD | SEC_RELOC |
 576    SEC_READONLY ),
 577   '_',        /* Leading underscore.  */
 578   '/',        /* ar_pad_char.  */
 579   15,         /* ar_max_namelen.  */
 580   0,          /* match priority.  */
 581
 582   /* Data.  */
 583   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 584   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 585   bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 586
 587   /* Headers.  */
 588   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 589   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 590   bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 591
 592   {
 593     _bfd_dummy_target,
 594     coff_object_p,
 595     bfd_generic_archive_p,
 596     _bfd_dummy_target
 597   },
 598   {
 599     bfd_false,
 600     coff_mkobject,
 601     _bfd_generic_mkarchive,
 602     bfd_false
 603   },
 604   {
 605     bfd_false,
 606     coff_write_object_contents,
 607     _bfd_write_archive_contents,
 608     bfd_false
 609   },
 610
 611   BFD_JUMP_TABLE_GENERIC (coff),
 612   BFD_JUMP_TABLE_COPY (coff),
 613   BFD_JUMP_TABLE_CORE (_bfd_nocore),
 614   BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 615   BFD_JUMP_TABLE_SYMBOLS (coff),
 616   BFD_JUMP_TABLE_RELOCS (coff),
 617   BFD_JUMP_TABLE_WRITE (coff),
 618   BFD_JUMP_TABLE_LINK (coff),
 619   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 620
 621  /* Alternative_target.  */
 622 #ifdef TARGET_LITTLE_SYM
 623   & TARGET_LITTLE_SYM,
 624 #else
 625   NULL,
 626 #endif
 627
 628   COFF_SWAP_TABLE
 629 };