1/* BFD back-end for OpenRISC 1000 COFF binaries. 2 Copyright 2002, 2003, 2004, 2005 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 2 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, MA 02110-1301, USA. */ 20 21#define OR32 1 22 23#include "bfd.h" 24#include "sysdep.h" 25#include "libbfd.h" 26#include "coff/or32.h" 27#include "coff/internal.h" 28#include "libcoff.h" 29 30static long get_symbol_value 31 PARAMS ((asymbol *)); 32static bfd_reloc_status_type or32_reloc 33 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 34static bfd_boolean coff_or32_relocate_section 35 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 36 struct internal_reloc *, struct internal_syment *, asection **)); 37static bfd_boolean coff_or32_adjust_symndx 38 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, 39 struct internal_reloc *, bfd_boolean *)); 40static void reloc_processing 41 PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *)); 42 43#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2) 44 45#define INSERT_HWORD(WORD,HWORD) \ 46 (((WORD) & 0xffff0000) | ((HWORD)& 0x0000ffff)) 47#define EXTRACT_HWORD(WORD) \ 48 ((WORD) & 0x0000ffff) 49#define SIGN_EXTEND_HWORD(HWORD) \ 50 ((HWORD) & 0x8000 ? (HWORD)|(~0xffffL) : (HWORD)) 51 52#define INSERT_JUMPTARG(WORD,JT) \ 53 (((WORD) & 0xfc000000) | ((JT)& 0x03ffffff)) 54#define EXTRACT_JUMPTARG(WORD) \ 55 ((WORD) & 0x03ffffff) 56#define SIGN_EXTEND_JUMPTARG(JT) \ 57 ((JT) & 0x04000000 ? (JT)|(~0x03ffffffL) : (JT)) 58 59/* Provided the symbol, returns the value reffed. */ 60 61static long 62get_symbol_value (symbol) 63 asymbol *symbol; 64{ 65 long relocation = 0; 66 67 if (bfd_is_com_section (symbol->section)) 68 relocation = 0; 69 else 70 relocation = symbol->value + 71 symbol->section->output_section->vma + 72 symbol->section->output_offset; 73 74 return relocation; 75} 76 77/* This function is in charge of performing all the or32 relocations. */ 78 79static bfd_reloc_status_type 80or32_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd, 81 error_message) 82 bfd *abfd; 83 arelent *reloc_entry; 84 asymbol *symbol_in; 85 PTR data; 86 asection *input_section; 87 bfd *output_bfd; 88 char **error_message; 89{ 90 /* The consth relocation comes in two parts, we have to remember 91 the state between calls, in these variables. */ 92 static bfd_boolean part1_consth_active = FALSE; 93 static unsigned long part1_consth_value; 94 95 unsigned long insn; 96 unsigned long sym_value; 97 unsigned long unsigned_value; 98 unsigned short r_type; 99 long signed_value; 100 101 unsigned long addr = reloc_entry->address ; /*+ input_section->vma*/ 102 bfd_byte *hit_data =addr + (bfd_byte *)(data); 103 104 r_type = reloc_entry->howto->type; 105 106 if (output_bfd) 107 { 108 /* Partial linking - do nothing. */ 109 reloc_entry->address += input_section->output_offset; 110 return bfd_reloc_ok; 111 } 112 113 if (symbol_in != NULL 114 && bfd_is_und_section (symbol_in->section)) 115 { 116 /* Keep the state machine happy in case we're called again. */ 117 if (r_type == R_IHIHALF) 118 { 119 part1_consth_active = TRUE; 120 part1_consth_value = 0; 121 } 122 123 return bfd_reloc_undefined; 124 } 125 126 if ((part1_consth_active) && (r_type != R_IHCONST)) 127 { 128 part1_consth_active = FALSE; 129 *error_message = (char *) "Missing IHCONST"; 130 131 return bfd_reloc_dangerous; 132 } 133 134 sym_value = get_symbol_value (symbol_in); 135 136 switch (r_type) 137 { 138 case R_IREL: 139 insn = bfd_get_32(abfd, hit_data); 140 141 /* Take the value in the field and sign extend it. */ 142 signed_value = EXTRACT_JUMPTARG (insn); 143 signed_value = SIGN_EXTEND_JUMPTARG (signed_value); 144 signed_value <<= 2; 145 146 /* See the note on the R_IREL reloc in coff_or32_relocate_section. */ 147 if (signed_value == - (long) reloc_entry->address) 148 signed_value = 0; 149 150 signed_value += sym_value + reloc_entry->addend; 151 /* Relative jmp/call, so subtract from the value the 152 address of the place we're coming from. */ 153 signed_value -= (reloc_entry->address 154 + input_section->output_section->vma 155 + input_section->output_offset); 156 if (signed_value > 0x7ffffff || signed_value < -0x8000000) 157 return bfd_reloc_overflow; 158 159 signed_value >>= 2; 160 insn = INSERT_JUMPTARG (insn, signed_value); 161 bfd_put_32 (abfd, insn, hit_data); 162 break; 163 164 case R_ILOHALF: 165 insn = bfd_get_32 (abfd, hit_data); 166 unsigned_value = EXTRACT_HWORD (insn); 167 unsigned_value += sym_value + reloc_entry->addend; 168 insn = INSERT_HWORD (insn, unsigned_value); 169 bfd_put_32 (abfd, insn, hit_data); 170 break; 171 172 case R_IHIHALF: 173 insn = bfd_get_32 (abfd, hit_data); 174 175 /* consth, part 1 176 Just get the symbol value that is referenced. */ 177 part1_consth_active = TRUE; 178 part1_consth_value = sym_value + reloc_entry->addend; 179 180 /* Don't modify insn until R_IHCONST. */ 181 break; 182 183 case R_IHCONST: 184 insn = bfd_get_32 (abfd, hit_data); 185 186 /* consth, part 2 187 Now relocate the reference. */ 188 if (! part1_consth_active) 189 { 190 *error_message = (char *) "Missing IHIHALF"; 191 return bfd_reloc_dangerous; 192 } 193 194 /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */ 195 unsigned_value = 0; /*EXTRACT_HWORD(insn) << 16;*/ 196 unsigned_value += reloc_entry->addend; /* r_symndx */ 197 unsigned_value += part1_consth_value; 198 unsigned_value = unsigned_value >> 16; 199 insn = INSERT_HWORD (insn, unsigned_value); 200 part1_consth_active = FALSE; 201 bfd_put_32 (abfd, insn, hit_data); 202 break; 203 204 case R_BYTE: 205 insn = bfd_get_8 (abfd, hit_data); 206 unsigned_value = insn + sym_value + reloc_entry->addend; 207 if (unsigned_value & 0xffffff00) 208 return bfd_reloc_overflow; 209 bfd_put_8 (abfd, unsigned_value, hit_data); 210 break; 211 212 case R_HWORD: 213 insn = bfd_get_16 (abfd, hit_data); 214 unsigned_value = insn + sym_value + reloc_entry->addend; 215 if (unsigned_value & 0xffff0000) 216 return bfd_reloc_overflow; 217 bfd_put_16 (abfd, insn, hit_data); 218 break; 219 220 case R_WORD: 221 insn = bfd_get_32 (abfd, hit_data); 222 insn += sym_value + reloc_entry->addend; 223 bfd_put_32 (abfd, insn, hit_data); 224 break; 225 226 default: 227 *error_message = _("Unrecognized reloc"); 228 return bfd_reloc_dangerous; 229 } 230 231 return bfd_reloc_ok; 232} 233 234/* type rightshift 235 size 236 bitsize 237 pc-relative 238 bitpos 239 absolute 240 complain_on_overflow 241 special_function 242 relocation name 243 partial_inplace 244 src_mask 245*/ 246 247/* FIXME: I'm not real sure about this table. */ 248static reloc_howto_type howto_table[] = 249{ 250 { R_ABS, 0, 3, 32, FALSE, 0, complain_overflow_bitfield, or32_reloc, "ABS", TRUE, 0xffffffff,0xffffffff, FALSE }, 251 EMPTY_HOWTO (1), 252 EMPTY_HOWTO (2), 253 EMPTY_HOWTO (3), 254 EMPTY_HOWTO (4), 255 EMPTY_HOWTO (5), 256 EMPTY_HOWTO (6), 257 EMPTY_HOWTO (7), 258 EMPTY_HOWTO (8), 259 EMPTY_HOWTO (9), 260 EMPTY_HOWTO (10), 261 EMPTY_HOWTO (11), 262 EMPTY_HOWTO (12), 263 EMPTY_HOWTO (13), 264 EMPTY_HOWTO (14), 265 EMPTY_HOWTO (15), 266 EMPTY_HOWTO (16), 267 EMPTY_HOWTO (17), 268 EMPTY_HOWTO (18), 269 EMPTY_HOWTO (19), 270 EMPTY_HOWTO (20), 271 EMPTY_HOWTO (21), 272 EMPTY_HOWTO (22), 273 EMPTY_HOWTO (23), 274 { R_IREL, 0, 3, 32, TRUE, 0, complain_overflow_signed, or32_reloc, "IREL", TRUE, 0xffffffff,0xffffffff, FALSE }, 275 { R_IABS, 0, 3, 32, FALSE, 0, complain_overflow_bitfield, or32_reloc, "IABS", TRUE, 0xffffffff,0xffffffff, FALSE }, 276 { R_ILOHALF, 0, 3, 16, TRUE, 0, complain_overflow_signed, or32_reloc, "ILOHALF", TRUE, 0x0000ffff,0x0000ffff, FALSE }, 277 { R_IHIHALF, 0, 3, 16, TRUE, 16,complain_overflow_signed, or32_reloc, "IHIHALF", TRUE, 0xffff0000,0xffff0000, FALSE }, 278 { R_IHCONST, 0, 3, 16, TRUE, 0, complain_overflow_signed, or32_reloc, "IHCONST", TRUE, 0xffff0000,0xffff0000, FALSE }, 279 { R_BYTE, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, or32_reloc, "BYTE", TRUE, 0x000000ff,0x000000ff, FALSE }, 280 { R_HWORD, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, or32_reloc, "HWORD", TRUE, 0x0000ffff,0x0000ffff, FALSE }, 281 { R_WORD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, or32_reloc, "WORD", TRUE, 0xffffffff,0xffffffff, FALSE }, 282}; 283 284#define BADMAG(x) OR32BADMAG (x) 285 286#define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \ 287 reloc_processing (relent, reloc, symbols, abfd, section) 288 289static void 290reloc_processing (relent,reloc, symbols, abfd, section) 291 arelent *relent; 292 struct internal_reloc *reloc; 293 asymbol **symbols; 294 bfd *abfd; 295 asection *section; 296{ 297 static bfd_vma ihihalf_vaddr = (bfd_vma) -1; 298 299 relent->address = reloc->r_vaddr; 300 relent->howto = howto_table + reloc->r_type; 301 302 if (reloc->r_type == R_IHCONST) 303 { 304 /* The address of an R_IHCONST should always be the address of 305 the immediately preceding R_IHIHALF. relocs generated by gas 306 are correct, but relocs generated by High C are different (I 307 can't figure out what the address means for High C). We can 308 handle both gas and High C by ignoring the address here, and 309 simply reusing the address saved for R_IHIHALF. */ 310 if (ihihalf_vaddr == (bfd_vma) -1) 311 abort (); 312 313 relent->address = ihihalf_vaddr; 314 ihihalf_vaddr = (bfd_vma) -1; 315 relent->addend = reloc->r_symndx; 316 relent->sym_ptr_ptr= bfd_abs_section_ptr->symbol_ptr_ptr; 317 } 318 else 319 { 320 relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx]; 321 relent->addend = 0; 322 relent->address-= section->vma; 323 324 if (reloc->r_type == R_IHIHALF) 325 ihihalf_vaddr = relent->address; 326 else if (ihihalf_vaddr != (bfd_vma) -1) 327 abort (); 328 } 329} 330 331/* The reloc processing routine for the optimized COFF linker. */ 332 333static bfd_boolean 334coff_or32_relocate_section (output_bfd, info, input_bfd, input_section, 335 contents, relocs, syms, sections) 336 bfd *output_bfd ATTRIBUTE_UNUSED; 337 struct bfd_link_info *info; 338 bfd *input_bfd; 339 asection *input_section; 340 bfd_byte *contents; 341 struct internal_reloc *relocs; 342 struct internal_syment *syms; 343 asection **sections; 344{ 345 struct internal_reloc *rel; 346 struct internal_reloc *relend; 347 bfd_boolean hihalf; 348 bfd_vma hihalf_val; 349 350 /* If we are performing a relocatable link, we don't need to do a 351 thing. The caller will take care of adjusting the reloc 352 addresses and symbol indices. */ 353 if (info->relocatable) 354 return TRUE; 355 356 hihalf = FALSE; 357 hihalf_val = 0; 358 359 rel = relocs; 360 relend = rel + input_section->reloc_count; 361 362 for (; rel < relend; rel++) 363 { 364 long symndx; 365 bfd_byte *loc; 366 struct coff_link_hash_entry *h; 367 struct internal_syment *sym; 368 asection *sec; 369 bfd_vma val; 370 bfd_boolean overflow; 371 unsigned long insn; 372 long signed_value; 373 unsigned long unsigned_value; 374 bfd_reloc_status_type rstat; 375 376 symndx = rel->r_symndx; 377 loc = contents + rel->r_vaddr - input_section->vma; 378 379 if (symndx == -1 || rel->r_type == R_IHCONST) 380 h = NULL; 381 else 382 h = obj_coff_sym_hashes (input_bfd)[symndx]; 383 384 sym = NULL; 385 sec = NULL; 386 val = 0; 387 388 /* An R_IHCONST reloc does not have a symbol. Instead, the 389 symbol index is an addend. R_IHCONST is always used in 390 conjunction with R_IHHALF. */ 391 if (rel->r_type != R_IHCONST) 392 { 393 if (h == NULL) 394 { 395 if (symndx == -1) 396 sec = bfd_abs_section_ptr; 397 else 398 { 399 sym = syms + symndx; 400 sec = sections[symndx]; 401 val = (sec->output_section->vma 402 + sec->output_offset 403 + sym->n_value 404 - sec->vma); 405 } 406 } 407 else 408 { 409 if (h->root.type == bfd_link_hash_defined 410 || h->root.type == bfd_link_hash_defweak) 411 { 412 sec = h->root.u.def.section; 413 val = (h->root.u.def.value 414 + sec->output_section->vma 415 + sec->output_offset); 416 } 417 else 418 { 419 if (! ((*info->callbacks->undefined_symbol) 420 (info, h->root.root.string, input_bfd, input_section, 421 rel->r_vaddr - input_section->vma, TRUE))) 422 return FALSE; 423 } 424 } 425 426 if (hihalf) 427 { 428 if (! ((*info->callbacks->reloc_dangerous) 429 (info, "missing IHCONST reloc", input_bfd, 430 input_section, rel->r_vaddr - input_section->vma))) 431 return FALSE; 432 hihalf = FALSE; 433 } 434 } 435 436 overflow = FALSE; 437 438 switch (rel->r_type) 439 { 440 default: 441 bfd_set_error (bfd_error_bad_value); 442 return FALSE; 443 444 case R_IREL: 445 insn = bfd_get_32 (input_bfd, loc); 446 447 /* Extract the addend. */ 448 signed_value = EXTRACT_JUMPTARG (insn); 449 signed_value = SIGN_EXTEND_JUMPTARG (signed_value); 450 signed_value <<= 2; 451 452 /* Determine the destination of the jump. */ 453 signed_value += val; 454 455 /* Make the destination PC relative. */ 456 signed_value -= (input_section->output_section->vma 457 + input_section->output_offset 458 + (rel->r_vaddr - input_section->vma)); 459 if (signed_value > 0x7ffffff || signed_value < - 0x8000000) 460 { 461 overflow = TRUE; 462 signed_value = 0; 463 } 464 465 /* Put the adjusted value back into the instruction. */ 466 signed_value >>= 2; 467 insn = INSERT_JUMPTARG(insn, signed_value); 468 469 bfd_put_32 (input_bfd, (bfd_vma) insn, loc); 470 break; 471 472 case R_ILOHALF: 473 insn = bfd_get_32 (input_bfd, loc); 474 unsigned_value = EXTRACT_HWORD (insn); 475 unsigned_value += val; 476 insn = INSERT_HWORD (insn, unsigned_value); 477 bfd_put_32 (input_bfd, insn, loc); 478 break; 479 480 case R_IHIHALF: 481 /* Save the value for the R_IHCONST reloc. */ 482 hihalf = TRUE; 483 hihalf_val = val; 484 break; 485 486 case R_IHCONST: 487 if (! hihalf) 488 { 489 if (! ((*info->callbacks->reloc_dangerous) 490 (info, "missing IHIHALF reloc", input_bfd, 491 input_section, rel->r_vaddr - input_section->vma))) 492 return FALSE; 493 hihalf_val = 0; 494 } 495 496 insn = bfd_get_32 (input_bfd, loc); 497 unsigned_value = rel->r_symndx + hihalf_val; 498 unsigned_value >>= 16; 499 insn = INSERT_HWORD (insn, unsigned_value); 500 bfd_put_32 (input_bfd, (bfd_vma) insn, loc); 501 502 hihalf = FALSE; 503 break; 504 505 case R_BYTE: 506 case R_HWORD: 507 case R_WORD: 508 rstat = _bfd_relocate_contents (howto_table + rel->r_type, 509 input_bfd, val, loc); 510 if (rstat == bfd_reloc_overflow) 511 overflow = TRUE; 512 else if (rstat != bfd_reloc_ok) 513 abort (); 514 break; 515 } 516 517 if (overflow) 518 { 519 const char *name; 520 char buf[SYMNMLEN + 1]; 521 522 if (symndx == -1) 523 name = "*ABS*"; 524 else if (h != NULL) 525 name = NULL; 526 else if (sym == NULL) 527 name = "*unknown*"; 528 else if (sym->_n._n_n._n_zeroes == 0 529 && sym->_n._n_n._n_offset != 0) 530 name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset; 531 else 532 { 533 strncpy (buf, sym->_n._n_name, SYMNMLEN); 534 buf[SYMNMLEN] = '\0'; 535 name = buf; 536 } 537 538 if (! ((*info->callbacks->reloc_overflow) 539 (info, (h ? &h->root : NULL), name, 540 howto_table[rel->r_type].name, (bfd_vma) 0, input_bfd, 541 input_section, rel->r_vaddr - input_section->vma))) 542 return FALSE; 543 } 544 } 545 546 return TRUE; 547} 548 549#define coff_relocate_section coff_or32_relocate_section 550 551/* We don't want to change the symndx of a R_IHCONST reloc, since it 552 is actually an addend, not a symbol index at all. */ 553 554static bfd_boolean 555coff_or32_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp) 556 bfd *obfd ATTRIBUTE_UNUSED; 557 struct bfd_link_info *info ATTRIBUTE_UNUSED; 558 bfd *ibfd ATTRIBUTE_UNUSED; 559 asection *sec ATTRIBUTE_UNUSED; 560 struct internal_reloc *irel; 561 bfd_boolean *adjustedp; 562{ 563 if (irel->r_type == R_IHCONST) 564 *adjustedp = TRUE; 565 else 566 *adjustedp = FALSE; 567 return TRUE; 568} 569 570#define coff_adjust_symndx coff_or32_adjust_symndx 571 572#include "coffcode.h" 573 574const bfd_target or32coff_big_vec = 575{ 576 "coff-or32-big", /* Name. */ 577 bfd_target_coff_flavour, 578 BFD_ENDIAN_BIG, /* Data byte order is big. */ 579 BFD_ENDIAN_BIG, /* Header byte order is big. */ 580 581 (HAS_RELOC | EXEC_P | /* Object flags. */ 582 HAS_LINENO | HAS_DEBUG | 583 HAS_SYMS | HAS_LOCALS | WP_TEXT), 584 585 (SEC_HAS_CONTENTS | SEC_ALLOC | /* Section flags. */ 586 SEC_LOAD | SEC_RELOC | 587 SEC_READONLY ), 588 '_', /* Leading underscore. */ 589 '/', /* ar_pad_char. */ 590 15, /* ar_max_namelen. */ 591 592 /* Data. */ 593 bfd_getb64, bfd_getb_signed_64, bfd_putb64, 594 bfd_getb32, bfd_getb_signed_32, bfd_putb32, 595 bfd_getb16, bfd_getb_signed_16, bfd_putb16, 596 597 /* Headers. */ 598 bfd_getb64, bfd_getb_signed_64, bfd_putb64, 599 bfd_getb32, bfd_getb_signed_32, bfd_putb32, 600 bfd_getb16, bfd_getb_signed_16, bfd_putb16, 601 602 { 603 _bfd_dummy_target, 604 coff_object_p, 605 bfd_generic_archive_p, 606 _bfd_dummy_target 607 }, 608 { 609 bfd_false, 610 coff_mkobject, 611 _bfd_generic_mkarchive, 612 bfd_false 613 }, 614 { 615 bfd_false, 616 coff_write_object_contents, 617 _bfd_write_archive_contents, 618 bfd_false 619 }, 620 621 BFD_JUMP_TABLE_GENERIC (coff), 622 BFD_JUMP_TABLE_COPY (coff), 623 BFD_JUMP_TABLE_CORE (_bfd_nocore), 624 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff), 625 BFD_JUMP_TABLE_SYMBOLS (coff), 626 BFD_JUMP_TABLE_RELOCS (coff), 627 BFD_JUMP_TABLE_WRITE (coff), 628 BFD_JUMP_TABLE_LINK (coff), 629 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 630 631 /* Alternative_target. */ 632#ifdef TARGET_LITTLE_SYM 633 & TARGET_LITTLE_SYM, 634#else 635 NULL, 636#endif 637 638 COFF_SWAP_TABLE 639}; 640