1/* BFD back-end for ARM COFF files. 2 Copyright (C) 1990-2022 Free Software Foundation, Inc. 3 Written by Cygnus Support. 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#include "sysdep.h" 23#include "bfd.h" 24#include "libbfd.h" 25#include "coff/arm.h" 26#include "coff/internal.h" 27#include "cpu-arm.h" 28#include "coff-arm.h" 29 30#ifdef COFF_WITH_PE 31#include "coff/pe.h" 32#endif 33 34#include "libcoff.h" 35 36/* All users of this file have bfd_octets_per_byte (abfd, sec) == 1. */ 37#define OCTETS_PER_BYTE(ABFD, SEC) 1 38 39/* Macros for manipulation the bits in the flags field of the coff data 40 structure. */ 41#define APCS_26_FLAG(abfd) \ 42 (coff_data (abfd)->flags & F_APCS_26) 43 44#define APCS_FLOAT_FLAG(abfd) \ 45 (coff_data (abfd)->flags & F_APCS_FLOAT) 46 47#define PIC_FLAG(abfd) \ 48 (coff_data (abfd)->flags & F_PIC) 49 50#define APCS_SET(abfd) \ 51 (coff_data (abfd)->flags & F_APCS_SET) 52 53#define SET_APCS_FLAGS(abfd, flgs) \ 54 do \ 55 { \ 56 coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \ 57 coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \ 58 } \ 59 while (0) 60 61#define INTERWORK_FLAG(abfd) \ 62 (coff_data (abfd)->flags & F_INTERWORK) 63 64#define INTERWORK_SET(abfd) \ 65 (coff_data (abfd)->flags & F_INTERWORK_SET) 66 67#define SET_INTERWORK_FLAG(abfd, flg) \ 68 do \ 69 { \ 70 coff_data (abfd)->flags &= ~F_INTERWORK; \ 71 coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \ 72 } \ 73 while (0) 74 75#ifndef NUM_ELEM 76#define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0])) 77#endif 78 79typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype; 80/* Some typedefs for holding instructions. */ 81typedef unsigned long int insn32; 82typedef unsigned short int insn16; 83 84/* The linker script knows the section names for placement. 85 The entry_names are used to do simple name mangling on the stubs. 86 Given a function name, and its type, the stub can be found. The 87 name can be changed. The only requirement is the %s be present. */ 88 89#define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" 90#define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" 91 92#define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" 93#define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" 94 95/* Used by the assembler. */ 96 97static bfd_reloc_status_type 98coff_arm_reloc (bfd *abfd, 99 arelent *reloc_entry, 100 asymbol *symbol ATTRIBUTE_UNUSED, 101 void * data, 102 asection *input_section, 103 bfd *output_bfd, 104 char **error_message ATTRIBUTE_UNUSED) 105{ 106 symvalue diff; 107 108 if (output_bfd == NULL) 109 return bfd_reloc_continue; 110 111 diff = reloc_entry->addend; 112 113#define DOIT(x) \ 114 x = ((x & ~howto->dst_mask) \ 115 | (((x & howto->src_mask) + diff) & howto->dst_mask)) 116 117 if (diff != 0) 118 { 119 reloc_howto_type *howto = reloc_entry->howto; 120 bfd_size_type octets = (reloc_entry->address 121 * OCTETS_PER_BYTE (abfd, input_section)); 122 unsigned char *addr = (unsigned char *) data + octets; 123 124 if (!bfd_reloc_offset_in_range (howto, abfd, input_section, octets)) 125 return bfd_reloc_outofrange; 126 127 switch (bfd_get_reloc_size (howto)) 128 { 129 case 1: 130 { 131 char x = bfd_get_8 (abfd, addr); 132 DOIT (x); 133 bfd_put_8 (abfd, x, addr); 134 } 135 break; 136 137 case 2: 138 { 139 short x = bfd_get_16 (abfd, addr); 140 DOIT (x); 141 bfd_put_16 (abfd, (bfd_vma) x, addr); 142 } 143 break; 144 145 case 4: 146 { 147 long x = bfd_get_32 (abfd, addr); 148 DOIT (x); 149 bfd_put_32 (abfd, (bfd_vma) x, addr); 150 } 151 break; 152 153 default: 154 abort (); 155 } 156 } 157 158 /* Now let bfd_perform_relocation finish everything up. */ 159 return bfd_reloc_continue; 160} 161 162/* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name() 163 in this file), then TARGET_UNDERSCORE should be defined, otherwise it 164 should not. */ 165#ifndef TARGET_UNDERSCORE 166#define TARGET_UNDERSCORE '_' 167#endif 168 169#ifndef PCRELOFFSET 170#define PCRELOFFSET true 171#endif 172 173/* These most certainly belong somewhere else. Just had to get rid of 174 the manifest constants in the code. */ 175 176#ifdef ARM_WINCE 177 178#define ARM_26D 0 179#define ARM_32 1 180#define ARM_RVA32 2 181#define ARM_26 3 182#define ARM_THUMB12 4 183#define ARM_SECTION 14 184#define ARM_SECREL 15 185 186#else 187 188#define ARM_8 0 189#define ARM_16 1 190#define ARM_32 2 191#define ARM_26 3 192#define ARM_DISP8 4 193#define ARM_DISP16 5 194#define ARM_DISP32 6 195#define ARM_26D 7 196/* 8 is unused. */ 197#define ARM_NEG16 9 198#define ARM_NEG32 10 199#define ARM_RVA32 11 200#define ARM_THUMB9 12 201#define ARM_THUMB12 13 202#define ARM_THUMB23 14 203 204#endif 205 206static bfd_reloc_status_type aoutarm_fix_pcrel_26_done 207 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 208static bfd_reloc_status_type aoutarm_fix_pcrel_26 209 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 210static bfd_reloc_status_type coff_thumb_pcrel_12 211 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 212#ifndef ARM_WINCE 213static bfd_reloc_status_type coff_thumb_pcrel_9 214 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 215static bfd_reloc_status_type coff_thumb_pcrel_23 216 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 217#endif 218 219static reloc_howto_type aoutarm_std_reloc_howto[] = 220 { 221#ifdef ARM_WINCE 222 HOWTO (ARM_26D, 223 2, 224 4, 225 24, 226 true, 227 0, 228 complain_overflow_dont, 229 aoutarm_fix_pcrel_26_done, 230 "ARM_26D", 231 true, /* partial_inplace. */ 232 0x00ffffff, 233 0x0, 234 PCRELOFFSET), 235 HOWTO (ARM_32, 236 0, 237 4, 238 32, 239 false, 240 0, 241 complain_overflow_bitfield, 242 coff_arm_reloc, 243 "ARM_32", 244 true, /* partial_inplace. */ 245 0xffffffff, 246 0xffffffff, 247 PCRELOFFSET), 248 HOWTO (ARM_RVA32, 249 0, 250 4, 251 32, 252 false, 253 0, 254 complain_overflow_bitfield, 255 coff_arm_reloc, 256 "ARM_RVA32", 257 true, /* partial_inplace. */ 258 0xffffffff, 259 0xffffffff, 260 PCRELOFFSET), 261 HOWTO (ARM_26, 262 2, 263 4, 264 24, 265 true, 266 0, 267 complain_overflow_signed, 268 aoutarm_fix_pcrel_26 , 269 "ARM_26", 270 false, 271 0x00ffffff, 272 0x00ffffff, 273 PCRELOFFSET), 274 HOWTO (ARM_THUMB12, 275 1, 276 2, 277 11, 278 true, 279 0, 280 complain_overflow_signed, 281 coff_thumb_pcrel_12 , 282 "ARM_THUMB12", 283 false, 284 0x000007ff, 285 0x000007ff, 286 PCRELOFFSET), 287 EMPTY_HOWTO (-1), 288 EMPTY_HOWTO (-1), 289 EMPTY_HOWTO (-1), 290 EMPTY_HOWTO (-1), 291 EMPTY_HOWTO (-1), 292 EMPTY_HOWTO (-1), 293 EMPTY_HOWTO (-1), 294 EMPTY_HOWTO (-1), 295 EMPTY_HOWTO (-1), 296 HOWTO (ARM_SECTION, 297 0, 298 2, 299 16, 300 false, 301 0, 302 complain_overflow_bitfield, 303 coff_arm_reloc, 304 "ARM_SECTION", 305 true, /* partial_inplace. */ 306 0x0000ffff, 307 0x0000ffff, 308 PCRELOFFSET), 309 HOWTO (ARM_SECREL, 310 0, 311 4, 312 32, 313 false, 314 0, 315 complain_overflow_bitfield, 316 coff_arm_reloc, 317 "ARM_SECREL", 318 true, /* partial_inplace. */ 319 0xffffffff, 320 0xffffffff, 321 PCRELOFFSET), 322#else /* not ARM_WINCE */ 323 HOWTO (ARM_8, 324 0, 325 1, 326 8, 327 false, 328 0, 329 complain_overflow_bitfield, 330 coff_arm_reloc, 331 "ARM_8", 332 true, 333 0x000000ff, 334 0x000000ff, 335 PCRELOFFSET), 336 HOWTO (ARM_16, 337 0, 338 2, 339 16, 340 false, 341 0, 342 complain_overflow_bitfield, 343 coff_arm_reloc, 344 "ARM_16", 345 true, 346 0x0000ffff, 347 0x0000ffff, 348 PCRELOFFSET), 349 HOWTO (ARM_32, 350 0, 351 4, 352 32, 353 false, 354 0, 355 complain_overflow_bitfield, 356 coff_arm_reloc, 357 "ARM_32", 358 true, 359 0xffffffff, 360 0xffffffff, 361 PCRELOFFSET), 362 HOWTO (ARM_26, 363 2, 364 4, 365 24, 366 true, 367 0, 368 complain_overflow_signed, 369 aoutarm_fix_pcrel_26 , 370 "ARM_26", 371 false, 372 0x00ffffff, 373 0x00ffffff, 374 PCRELOFFSET), 375 HOWTO (ARM_DISP8, 376 0, 377 1, 378 8, 379 true, 380 0, 381 complain_overflow_signed, 382 coff_arm_reloc, 383 "ARM_DISP8", 384 true, 385 0x000000ff, 386 0x000000ff, 387 true), 388 HOWTO (ARM_DISP16, 389 0, 390 2, 391 16, 392 true, 393 0, 394 complain_overflow_signed, 395 coff_arm_reloc, 396 "ARM_DISP16", 397 true, 398 0x0000ffff, 399 0x0000ffff, 400 true), 401 HOWTO (ARM_DISP32, 402 0, 403 4, 404 32, 405 true, 406 0, 407 complain_overflow_signed, 408 coff_arm_reloc, 409 "ARM_DISP32", 410 true, 411 0xffffffff, 412 0xffffffff, 413 true), 414 HOWTO (ARM_26D, 415 2, 416 4, 417 24, 418 false, 419 0, 420 complain_overflow_dont, 421 aoutarm_fix_pcrel_26_done, 422 "ARM_26D", 423 true, 424 0x00ffffff, 425 0x0, 426 false), 427 /* 8 is unused */ 428 EMPTY_HOWTO (-1), 429 HOWTO (ARM_NEG16, 430 0, 431 -2, 432 16, 433 false, 434 0, 435 complain_overflow_bitfield, 436 coff_arm_reloc, 437 "ARM_NEG16", 438 true, 439 0x0000ffff, 440 0x0000ffff, 441 false), 442 HOWTO (ARM_NEG32, 443 0, 444 -4, 445 32, 446 false, 447 0, 448 complain_overflow_bitfield, 449 coff_arm_reloc, 450 "ARM_NEG32", 451 true, 452 0xffffffff, 453 0xffffffff, 454 false), 455 HOWTO (ARM_RVA32, 456 0, 457 4, 458 32, 459 false, 460 0, 461 complain_overflow_bitfield, 462 coff_arm_reloc, 463 "ARM_RVA32", 464 true, 465 0xffffffff, 466 0xffffffff, 467 PCRELOFFSET), 468 HOWTO (ARM_THUMB9, 469 1, 470 2, 471 8, 472 true, 473 0, 474 complain_overflow_signed, 475 coff_thumb_pcrel_9 , 476 "ARM_THUMB9", 477 false, 478 0x000000ff, 479 0x000000ff, 480 PCRELOFFSET), 481 HOWTO (ARM_THUMB12, 482 1, 483 2, 484 11, 485 true, 486 0, 487 complain_overflow_signed, 488 coff_thumb_pcrel_12 , 489 "ARM_THUMB12", 490 false, 491 0x000007ff, 492 0x000007ff, 493 PCRELOFFSET), 494 HOWTO (ARM_THUMB23, 495 1, 496 4, 497 22, 498 true, 499 0, 500 complain_overflow_signed, 501 coff_thumb_pcrel_23 , 502 "ARM_THUMB23", 503 false, 504 0x07ff07ff, 505 0x07ff07ff, 506 PCRELOFFSET) 507#endif /* not ARM_WINCE */ 508 }; 509 510#define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto) 511 512#ifdef COFF_WITH_PE 513/* Return TRUE if this relocation should 514 appear in the output .reloc section. */ 515 516static bool 517in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED, 518 reloc_howto_type * howto) 519{ 520 return !howto->pc_relative && howto->type != ARM_RVA32; 521} 522#endif 523 524#define RTYPE2HOWTO(cache_ptr, dst) \ 525 (cache_ptr)->howto = \ 526 (dst)->r_type < NUM_RELOCS \ 527 ? aoutarm_std_reloc_howto + (dst)->r_type \ 528 : NULL 529 530#define coff_rtype_to_howto coff_arm_rtype_to_howto 531 532static reloc_howto_type * 533coff_arm_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED, 534 asection *sec, 535 struct internal_reloc *rel, 536 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED, 537 struct internal_syment *sym ATTRIBUTE_UNUSED, 538 bfd_vma *addendp) 539{ 540 reloc_howto_type * howto; 541 542 if (rel->r_type >= NUM_RELOCS) 543 return NULL; 544 545 howto = aoutarm_std_reloc_howto + rel->r_type; 546 547 if (rel->r_type == ARM_RVA32) 548 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase; 549 550#if defined COFF_WITH_PE && defined ARM_WINCE 551 if (rel->r_type == ARM_SECREL) 552 { 553 bfd_vma osect_vma; 554 555 if (h && (h->type == bfd_link_hash_defined 556 || h->type == bfd_link_hash_defweak)) 557 osect_vma = h->root.u.def.section->output_section->vma; 558 else 559 { 560 int i; 561 562 /* Sigh, the only way to get the section to offset against 563 is to find it the hard way. */ 564 565 for (sec = abfd->sections, i = 1; i < sym->n_scnum; i++) 566 sec = sec->next; 567 568 osect_vma = sec->output_section->vma; 569 } 570 571 *addendp -= osect_vma; 572 } 573#endif 574 575 return howto; 576} 577 578/* Used by the assembler. */ 579 580static bfd_reloc_status_type 581aoutarm_fix_pcrel_26_done (bfd *abfd ATTRIBUTE_UNUSED, 582 arelent *reloc_entry ATTRIBUTE_UNUSED, 583 asymbol *symbol ATTRIBUTE_UNUSED, 584 void * data ATTRIBUTE_UNUSED, 585 asection *input_section ATTRIBUTE_UNUSED, 586 bfd *output_bfd ATTRIBUTE_UNUSED, 587 char **error_message ATTRIBUTE_UNUSED) 588{ 589 /* This is dead simple at present. */ 590 return bfd_reloc_ok; 591} 592 593/* Used by the assembler. */ 594 595static bfd_reloc_status_type 596aoutarm_fix_pcrel_26 (bfd *abfd, 597 arelent *reloc_entry, 598 asymbol *symbol, 599 void * data, 600 asection *input_section, 601 bfd *output_bfd, 602 char **error_message ATTRIBUTE_UNUSED) 603{ 604 bfd_vma relocation; 605 bfd_size_type addr = reloc_entry->address; 606 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr); 607 bfd_reloc_status_type flag = bfd_reloc_ok; 608 609 /* If this is an undefined symbol, return error. */ 610 if (bfd_is_und_section (symbol->section) 611 && (symbol->flags & BSF_WEAK) == 0) 612 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined; 613 614 /* If the sections are different, and we are doing a partial relocation, 615 just ignore it for now. */ 616 if (symbol->section->name != input_section->name 617 && output_bfd != (bfd *)NULL) 618 return bfd_reloc_continue; 619 620 relocation = (target & 0x00ffffff) << 2; 621 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */ 622 relocation += symbol->value; 623 relocation += symbol->section->output_section->vma; 624 relocation += symbol->section->output_offset; 625 relocation += reloc_entry->addend; 626 relocation -= input_section->output_section->vma; 627 relocation -= input_section->output_offset; 628 relocation -= addr; 629 630 if (relocation & 3) 631 return bfd_reloc_overflow; 632 633 /* Check for overflow. */ 634 if (relocation & 0x02000000) 635 { 636 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff) 637 flag = bfd_reloc_overflow; 638 } 639 else if (relocation & ~(bfd_vma) 0x03ffffff) 640 flag = bfd_reloc_overflow; 641 642 target &= ~0x00ffffff; 643 target |= (relocation >> 2) & 0x00ffffff; 644 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr); 645 646 /* Now the ARM magic... Change the reloc type so that it is marked as done. 647 Strictly this is only necessary if we are doing a partial relocation. */ 648 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D]; 649 650 return flag; 651} 652 653static bfd_reloc_status_type 654coff_thumb_pcrel_common (bfd *abfd, 655 arelent *reloc_entry, 656 asymbol *symbol, 657 void * data, 658 asection *input_section, 659 bfd *output_bfd, 660 char **error_message ATTRIBUTE_UNUSED, 661 thumb_pcrel_branchtype btype) 662{ 663 bfd_vma relocation = 0; 664 bfd_size_type addr = reloc_entry->address; 665 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr); 666 bfd_reloc_status_type flag = bfd_reloc_ok; 667 bfd_vma dstmsk; 668 bfd_vma offmsk; 669 bfd_vma signbit; 670 671 /* NOTE: This routine is currently used by GAS, but not by the link 672 phase. */ 673 switch (btype) 674 { 675 case b9: 676 dstmsk = 0x000000ff; 677 offmsk = 0x000001fe; 678 signbit = 0x00000100; 679 break; 680 681 case b12: 682 dstmsk = 0x000007ff; 683 offmsk = 0x00000ffe; 684 signbit = 0x00000800; 685 break; 686 687 case b23: 688 dstmsk = 0x07ff07ff; 689 offmsk = 0x007fffff; 690 signbit = 0x00400000; 691 break; 692 693 default: 694 abort (); 695 } 696 697 /* If this is an undefined symbol, return error. */ 698 if (bfd_is_und_section (symbol->section) 699 && (symbol->flags & BSF_WEAK) == 0) 700 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined; 701 702 /* If the sections are different, and we are doing a partial relocation, 703 just ignore it for now. */ 704 if (symbol->section->name != input_section->name 705 && output_bfd != (bfd *)NULL) 706 return bfd_reloc_continue; 707 708 switch (btype) 709 { 710 case b9: 711 case b12: 712 relocation = ((target & dstmsk) << 1); 713 break; 714 715 case b23: 716 if (bfd_big_endian (abfd)) 717 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4); 718 else 719 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15); 720 break; 721 722 default: 723 abort (); 724 } 725 726 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */ 727 relocation += symbol->value; 728 relocation += symbol->section->output_section->vma; 729 relocation += symbol->section->output_offset; 730 relocation += reloc_entry->addend; 731 relocation -= input_section->output_section->vma; 732 relocation -= input_section->output_offset; 733 relocation -= addr; 734 735 if (relocation & 1) 736 return bfd_reloc_overflow; 737 738 /* Check for overflow. */ 739 if (relocation & signbit) 740 { 741 if ((relocation & ~offmsk) != ~offmsk) 742 flag = bfd_reloc_overflow; 743 } 744 else if (relocation & ~offmsk) 745 flag = bfd_reloc_overflow; 746 747 target &= ~dstmsk; 748 switch (btype) 749 { 750 case b9: 751 case b12: 752 target |= (relocation >> 1); 753 break; 754 755 case b23: 756 if (bfd_big_endian (abfd)) 757 target |= (((relocation & 0xfff) >> 1) 758 | ((relocation << 4) & 0x07ff0000)); 759 else 760 target |= (((relocation & 0xffe) << 15) 761 | ((relocation >> 12) & 0x7ff)); 762 break; 763 764 default: 765 abort (); 766 } 767 768 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr); 769 770 /* Now the ARM magic... Change the reloc type so that it is marked as done. 771 Strictly this is only necessary if we are doing a partial relocation. */ 772 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D]; 773 774 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */ 775 return flag; 776} 777 778#ifndef ARM_WINCE 779static bfd_reloc_status_type 780coff_thumb_pcrel_23 (bfd *abfd, 781 arelent *reloc_entry, 782 asymbol *symbol, 783 void * data, 784 asection *input_section, 785 bfd *output_bfd, 786 char **error_message) 787{ 788 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, 789 input_section, output_bfd, error_message, 790 b23); 791} 792 793static bfd_reloc_status_type 794coff_thumb_pcrel_9 (bfd *abfd, 795 arelent *reloc_entry, 796 asymbol *symbol, 797 void * data, 798 asection *input_section, 799 bfd *output_bfd, 800 char **error_message) 801{ 802 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, 803 input_section, output_bfd, error_message, 804 b9); 805} 806#endif /* not ARM_WINCE */ 807 808static bfd_reloc_status_type 809coff_thumb_pcrel_12 (bfd *abfd, 810 arelent *reloc_entry, 811 asymbol *symbol, 812 void * data, 813 asection *input_section, 814 bfd *output_bfd, 815 char **error_message) 816{ 817 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, 818 input_section, output_bfd, error_message, 819 b12); 820} 821 822static reloc_howto_type * 823coff_arm_reloc_type_lookup (bfd * abfd, bfd_reloc_code_real_type code) 824{ 825#define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j 826 827 if (code == BFD_RELOC_CTOR) 828 switch (bfd_arch_bits_per_address (abfd)) 829 { 830 case 32: 831 code = BFD_RELOC_32; 832 break; 833 default: 834 return NULL; 835 } 836 837 switch (code) 838 { 839#ifdef ARM_WINCE 840 ASTD (BFD_RELOC_32, ARM_32); 841 ASTD (BFD_RELOC_RVA, ARM_RVA32); 842 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26); 843 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12); 844 ASTD (BFD_RELOC_32_SECREL, ARM_SECREL); 845#else 846 ASTD (BFD_RELOC_8, ARM_8); 847 ASTD (BFD_RELOC_16, ARM_16); 848 ASTD (BFD_RELOC_32, ARM_32); 849 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26); 850 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26); 851 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8); 852 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16); 853 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32); 854 ASTD (BFD_RELOC_RVA, ARM_RVA32); 855 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9); 856 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12); 857 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23); 858 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23); 859#endif 860 default: return NULL; 861 } 862} 863 864static reloc_howto_type * 865coff_arm_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 866 const char *r_name) 867{ 868 unsigned int i; 869 870 for (i = 0; 871 i < (sizeof (aoutarm_std_reloc_howto) 872 / sizeof (aoutarm_std_reloc_howto[0])); 873 i++) 874 if (aoutarm_std_reloc_howto[i].name != NULL 875 && strcasecmp (aoutarm_std_reloc_howto[i].name, r_name) == 0) 876 return &aoutarm_std_reloc_howto[i]; 877 878 return NULL; 879} 880 881#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2 882#define COFF_PAGE_SIZE 0x1000 883 884/* Turn a howto into a reloc nunmber. */ 885#define SELECT_RELOC(x,howto) { x.r_type = howto->type; } 886#define BADMAG(x) ARMBADMAG(x) 887#define ARM 1 /* Customize coffcode.h. */ 888 889#ifndef ARM_WINCE 890/* Make sure that the 'r_offset' field is copied properly 891 so that identical binaries will compare the same. */ 892#define SWAP_IN_RELOC_OFFSET H_GET_32 893#define SWAP_OUT_RELOC_OFFSET H_PUT_32 894#endif 895 896/* Extend the coff_link_hash_table structure with a few ARM specific fields. 897 This allows us to store global data here without actually creating any 898 global variables, which is a no-no in the BFD world. */ 899struct coff_arm_link_hash_table 900 { 901 /* The original coff_link_hash_table structure. MUST be first field. */ 902 struct coff_link_hash_table root; 903 904 /* The size in bytes of the section containing the Thumb-to-ARM glue. */ 905 bfd_size_type thumb_glue_size; 906 907 /* The size in bytes of the section containing the ARM-to-Thumb glue. */ 908 bfd_size_type arm_glue_size; 909 910 /* An arbitrary input BFD chosen to hold the glue sections. */ 911 bfd * bfd_of_glue_owner; 912 913 /* Support interworking with old, non-interworking aware ARM code. */ 914 int support_old_code; 915}; 916 917/* Get the ARM coff linker hash table from a link_info structure. */ 918#define coff_arm_hash_table(info) \ 919 ((struct coff_arm_link_hash_table *) ((info)->hash)) 920 921/* Create an ARM coff linker hash table. */ 922 923static struct bfd_link_hash_table * 924coff_arm_link_hash_table_create (bfd * abfd) 925{ 926 struct coff_arm_link_hash_table * ret; 927 size_t amt = sizeof (struct coff_arm_link_hash_table); 928 929 ret = bfd_zmalloc (amt); 930 if (ret == NULL) 931 return NULL; 932 933 if (!_bfd_coff_link_hash_table_init (&ret->root, 934 abfd, 935 _bfd_coff_link_hash_newfunc, 936 sizeof (struct coff_link_hash_entry))) 937 { 938 free (ret); 939 return NULL; 940 } 941 942 return & ret->root.root; 943} 944 945static bool 946arm_emit_base_file_entry (struct bfd_link_info *info, 947 bfd *output_bfd, 948 asection *input_section, 949 bfd_vma reloc_offset) 950{ 951 bfd_vma addr = (reloc_offset 952 - input_section->vma 953 + input_section->output_offset 954 + input_section->output_section->vma); 955 956 if (coff_data (output_bfd)->pe) 957 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase; 958 if (fwrite (&addr, sizeof (addr), 1, (FILE *) info->base_file) == 1) 959 return true; 960 961 bfd_set_error (bfd_error_system_call); 962 return false; 963} 964 965#ifndef ARM_WINCE 966/* The thumb form of a long branch is a bit finicky, because the offset 967 encoding is split over two fields, each in it's own instruction. They 968 can occur in any order. So given a thumb form of long branch, and an 969 offset, insert the offset into the thumb branch and return finished 970 instruction. 971 972 It takes two thumb instructions to encode the target address. Each has 973 11 bits to invest. The upper 11 bits are stored in one (identified by 974 H-0.. see below), the lower 11 bits are stored in the other (identified 975 by H-1). 976 977 Combine together and shifted left by 1 (it's a half word address) and 978 there you have it. 979 980 Op: 1111 = F, 981 H-0, upper address-0 = 000 982 Op: 1111 = F, 983 H-1, lower address-0 = 800 984 985 They can be ordered either way, but the arm tools I've seen always put 986 the lower one first. It probably doesn't matter. krk@cygnus.com 987 988 XXX: Actually the order does matter. The second instruction (H-1) 989 moves the computed address into the PC, so it must be the second one 990 in the sequence. The problem, however is that whilst little endian code 991 stores the instructions in HI then LOW order, big endian code does the 992 reverse. nickc@cygnus.com. */ 993 994#define LOW_HI_ORDER 0xF800F000 995#define HI_LOW_ORDER 0xF000F800 996 997static insn32 998insert_thumb_branch (insn32 br_insn, int rel_off) 999{ 1000 unsigned int low_bits; 1001 unsigned int high_bits; 1002 1003 BFD_ASSERT ((rel_off & 1) != 1); 1004 1005 rel_off >>= 1; /* Half word aligned address. */ 1006 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */ 1007 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */ 1008 1009 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER) 1010 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits; 1011 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER) 1012 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits; 1013 else 1014 /* FIXME: the BFD library should never abort except for internal errors 1015 - it should return an error status. */ 1016 abort (); /* Error - not a valid branch instruction form. */ 1017 1018 return br_insn; 1019} 1020 1021 1022static struct coff_link_hash_entry * 1023find_thumb_glue (struct bfd_link_info *info, 1024 const char *name, 1025 bfd *input_bfd) 1026{ 1027 char *tmp_name; 1028 struct coff_link_hash_entry *myh; 1029 size_t amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1; 1030 1031 tmp_name = bfd_malloc (amt); 1032 1033 BFD_ASSERT (tmp_name); 1034 1035 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); 1036 1037 myh = coff_link_hash_lookup 1038 (coff_hash_table (info), tmp_name, false, false, true); 1039 1040 if (myh == NULL) 1041 /* xgettext:c-format */ 1042 _bfd_error_handler (_("%pB: unable to find THUMB glue '%s' for `%s'"), 1043 input_bfd, tmp_name, name); 1044 1045 free (tmp_name); 1046 1047 return myh; 1048} 1049#endif /* not ARM_WINCE */ 1050 1051static struct coff_link_hash_entry * 1052find_arm_glue (struct bfd_link_info *info, 1053 const char *name, 1054 bfd *input_bfd) 1055{ 1056 char *tmp_name; 1057 struct coff_link_hash_entry * myh; 1058 size_t amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1; 1059 1060 tmp_name = bfd_malloc (amt); 1061 1062 BFD_ASSERT (tmp_name); 1063 1064 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); 1065 1066 myh = coff_link_hash_lookup 1067 (coff_hash_table (info), tmp_name, false, false, true); 1068 1069 if (myh == NULL) 1070 /* xgettext:c-format */ 1071 _bfd_error_handler (_("%pB: unable to find ARM glue '%s' for `%s'"), 1072 input_bfd, tmp_name, name); 1073 1074 free (tmp_name); 1075 1076 return myh; 1077} 1078 1079/* 1080 ARM->Thumb glue: 1081 1082 .arm 1083 __func_from_arm: 1084 ldr r12, __func_addr 1085 bx r12 1086 __func_addr: 1087 .word func @ behave as if you saw a ARM_32 reloc 1088*/ 1089 1090#define ARM2THUMB_GLUE_SIZE 12 1091static const insn32 a2t1_ldr_insn = 0xe59fc000; 1092static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; 1093static const insn32 a2t3_func_addr_insn = 0x00000001; 1094 1095/* 1096 Thumb->ARM: Thumb->(non-interworking aware) ARM 1097 1098 .thumb .thumb 1099 .align 2 .align 2 1100 __func_from_thumb: __func_from_thumb: 1101 bx pc push {r6, lr} 1102 nop ldr r6, __func_addr 1103 .arm mov lr, pc 1104 __func_change_to_arm: bx r6 1105 b func .arm 1106 __func_back_to_thumb: 1107 ldmia r13! {r6, lr} 1108 bx lr 1109 __func_addr: 1110 .word func 1111*/ 1112 1113#define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8) 1114#ifndef ARM_WINCE 1115static const insn16 t2a1_bx_pc_insn = 0x4778; 1116static const insn16 t2a2_noop_insn = 0x46c0; 1117static const insn32 t2a3_b_insn = 0xea000000; 1118 1119static const insn16 t2a1_push_insn = 0xb540; 1120static const insn16 t2a2_ldr_insn = 0x4e03; 1121static const insn16 t2a3_mov_insn = 0x46fe; 1122static const insn16 t2a4_bx_insn = 0x4730; 1123static const insn32 t2a5_pop_insn = 0xe8bd4040; 1124static const insn32 t2a6_bx_insn = 0xe12fff1e; 1125#endif 1126 1127/* TODO: 1128 We should really create new local (static) symbols in destination 1129 object for each stub we create. We should also create local 1130 (static) symbols within the stubs when switching between ARM and 1131 Thumb code. This will ensure that the debugger and disassembler 1132 can present a better view of stubs. 1133 1134 We can treat stubs like literal sections, and for the THUMB9 ones 1135 (short addressing range) we should be able to insert the stubs 1136 between sections. i.e. the simplest approach (since relocations 1137 are done on a section basis) is to dump the stubs at the end of 1138 processing a section. That way we can always try and minimise the 1139 offset to and from a stub. However, this does not map well onto 1140 the way that the linker/BFD does its work: mapping all input 1141 sections to output sections via the linker script before doing 1142 all the processing. 1143 1144 Unfortunately it may be easier to just to disallow short range 1145 Thumb->ARM stubs (i.e. no conditional inter-working branches, 1146 only branch-and-link (BL) calls. This will simplify the processing 1147 since we can then put all of the stubs into their own section. 1148 1149 TODO: 1150 On a different subject, rather than complaining when a 1151 branch cannot fit in the number of bits available for the 1152 instruction we should generate a trampoline stub (needed to 1153 address the complete 32bit address space). */ 1154 1155/* The standard COFF backend linker does not cope with the special 1156 Thumb BRANCH23 relocation. The alternative would be to split the 1157 BRANCH23 into separate HI23 and LO23 relocations. However, it is a 1158 bit simpler simply providing our own relocation driver. */ 1159 1160/* The reloc processing routine for the ARM/Thumb COFF linker. NOTE: 1161 This code is a very slightly modified copy of 1162 _bfd_coff_generic_relocate_section. It would be a much more 1163 maintainable solution to have a MACRO that could be expanded within 1164 _bfd_coff_generic_relocate_section that would only be provided for 1165 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that 1166 is different from the original. */ 1167 1168static bool 1169coff_arm_relocate_section (bfd *output_bfd, 1170 struct bfd_link_info *info, 1171 bfd *input_bfd, 1172 asection *input_section, 1173 bfd_byte *contents, 1174 struct internal_reloc *relocs, 1175 struct internal_syment *syms, 1176 asection **sections) 1177{ 1178 struct internal_reloc * rel; 1179 struct internal_reloc * relend; 1180#ifndef ARM_WINCE 1181 bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section); 1182#endif 1183 1184 rel = relocs; 1185 relend = rel + input_section->reloc_count; 1186 1187 for (; rel < relend; rel++) 1188 { 1189 int done = 0; 1190 long symndx; 1191 struct coff_link_hash_entry * h; 1192 struct internal_syment * sym; 1193 bfd_vma addend; 1194 bfd_vma val; 1195 reloc_howto_type * howto; 1196 bfd_reloc_status_type rstat; 1197 bfd_vma h_val; 1198 1199 symndx = rel->r_symndx; 1200 1201 if (symndx == -1) 1202 { 1203 h = NULL; 1204 sym = NULL; 1205 } 1206 else 1207 { 1208 h = obj_coff_sym_hashes (input_bfd)[symndx]; 1209 sym = syms + symndx; 1210 } 1211 1212 /* COFF treats common symbols in one of two ways. Either the 1213 size of the symbol is included in the section contents, or it 1214 is not. We assume that the size is not included, and force 1215 the rtype_to_howto function to adjust the addend as needed. */ 1216 1217 if (sym != NULL && sym->n_scnum != 0) 1218 addend = - sym->n_value; 1219 else 1220 addend = 0; 1221 1222 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h, 1223 sym, &addend); 1224 if (howto == NULL) 1225 return false; 1226 1227 /* The relocation_section function will skip pcrel_offset relocs 1228 when doing a relocatable link. However, we want to convert 1229 ARM_26 to ARM_26D relocs if possible. We return a fake howto in 1230 this case without pcrel_offset set, and adjust the addend to 1231 compensate. 'partial_inplace' is also set, since we want 'done' 1232 relocations to be reflected in section's data. */ 1233 if (rel->r_type == ARM_26 1234 && h != NULL 1235 && bfd_link_relocatable (info) 1236 && (h->root.type == bfd_link_hash_defined 1237 || h->root.type == bfd_link_hash_defweak) 1238 && (h->root.u.def.section->output_section 1239 == input_section->output_section)) 1240 { 1241 static reloc_howto_type fake_arm26_reloc = 1242 HOWTO (ARM_26, 1243 2, 1244 4, 1245 24, 1246 true, 1247 0, 1248 complain_overflow_signed, 1249 aoutarm_fix_pcrel_26 , 1250 "ARM_26", 1251 true, 1252 0x00ffffff, 1253 0x00ffffff, 1254 false); 1255 1256 addend -= rel->r_vaddr - input_section->vma; 1257#ifdef ARM_WINCE 1258 /* FIXME: I don't know why, but the hack is necessary for correct 1259 generation of bl's instruction offset. */ 1260 addend -= 8; 1261#endif 1262 howto = & fake_arm26_reloc; 1263 } 1264 1265#ifdef ARM_WINCE 1266 /* MS ARM-CE makes the reloc relative to the opcode's pc, not 1267 the next opcode's pc, so is off by one. */ 1268 if (howto->pc_relative && !bfd_link_relocatable (info)) 1269 addend -= 8; 1270#endif 1271 1272 /* If we are doing a relocatable link, then we can just ignore 1273 a PC relative reloc that is pcrel_offset. It will already 1274 have the correct value. If this is not a relocatable link, 1275 then we should ignore the symbol value. */ 1276 if (howto->pc_relative && howto->pcrel_offset) 1277 { 1278 if (bfd_link_relocatable (info)) 1279 continue; 1280 /* FIXME - it is not clear which targets need this next test 1281 and which do not. It is known that it is needed for the 1282 VxWorks targets but it is also known that it was suppressed 1283 for other ARM targets. This ought to be sorted out one day. */ 1284#ifdef ARM_COFF_BUGFIX 1285 /* We must not ignore the symbol value. If the symbol is 1286 within the same section, the relocation should have already 1287 been fixed, but if it is not, we'll be handed a reloc into 1288 the beginning of the symbol's section, so we must not cancel 1289 out the symbol's value, otherwise we'll be adding it in 1290 twice. */ 1291 if (sym != NULL && sym->n_scnum != 0) 1292 addend += sym->n_value; 1293#endif 1294 } 1295 1296 val = 0; 1297 1298 if (h == NULL) 1299 { 1300 asection *sec; 1301 1302 if (symndx == -1) 1303 { 1304 sec = bfd_abs_section_ptr; 1305 val = 0; 1306 } 1307 else 1308 { 1309 sec = sections[symndx]; 1310 val = (sec->output_section->vma 1311 + sec->output_offset 1312 + sym->n_value 1313 - sec->vma); 1314 } 1315 } 1316 else 1317 { 1318 /* We don't output the stubs if we are generating a 1319 relocatable output file, since we may as well leave the 1320 stub generation to the final linker pass. If we fail to 1321 verify that the name is defined, we'll try to build stubs 1322 for an undefined name... */ 1323 if (! bfd_link_relocatable (info) 1324 && ( h->root.type == bfd_link_hash_defined 1325 || h->root.type == bfd_link_hash_defweak)) 1326 { 1327 asection * h_sec = h->root.u.def.section; 1328 const char * name = h->root.root.string; 1329 1330 /* h locates the symbol referenced in the reloc. */ 1331 h_val = (h->root.u.def.value 1332 + h_sec->output_section->vma 1333 + h_sec->output_offset); 1334 1335 if (howto->type == ARM_26) 1336 { 1337 if ( h->symbol_class == C_THUMBSTATFUNC 1338 || h->symbol_class == C_THUMBEXTFUNC) 1339 { 1340 /* Arm code calling a Thumb function. */ 1341 unsigned long int tmp; 1342 bfd_vma my_offset; 1343 asection * s; 1344 long int ret_offset; 1345 struct coff_link_hash_entry * myh; 1346 struct coff_arm_link_hash_table * globals; 1347 1348 myh = find_arm_glue (info, name, input_bfd); 1349 if (myh == NULL) 1350 return false; 1351 1352 globals = coff_arm_hash_table (info); 1353 1354 BFD_ASSERT (globals != NULL); 1355 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 1356 1357 my_offset = myh->root.u.def.value; 1358 1359 s = bfd_get_section_by_name (globals->bfd_of_glue_owner, 1360 ARM2THUMB_GLUE_SECTION_NAME); 1361 BFD_ASSERT (s != NULL); 1362 BFD_ASSERT (s->contents != NULL); 1363 BFD_ASSERT (s->output_section != NULL); 1364 1365 if ((my_offset & 0x01) == 0x01) 1366 { 1367 if (h_sec->owner != NULL 1368 && INTERWORK_SET (h_sec->owner) 1369 && ! INTERWORK_FLAG (h_sec->owner)) 1370 _bfd_error_handler 1371 /* xgettext:c-format */ 1372 (_("%pB(%s): warning: interworking not enabled; " 1373 "first occurrence: %pB: arm call to thumb"), 1374 h_sec->owner, name, input_bfd); 1375 1376 --my_offset; 1377 myh->root.u.def.value = my_offset; 1378 1379 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn, 1380 s->contents + my_offset); 1381 1382 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn, 1383 s->contents + my_offset + 4); 1384 1385 /* It's a thumb address. Add the low order bit. */ 1386 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn, 1387 s->contents + my_offset + 8); 1388 1389 if (info->base_file 1390 && !arm_emit_base_file_entry (info, output_bfd, 1391 s, my_offset + 8)) 1392 return false; 1393 } 1394 1395 BFD_ASSERT (my_offset <= globals->arm_glue_size); 1396 1397 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr 1398 - input_section->vma); 1399 1400 tmp = tmp & 0xFF000000; 1401 1402 /* Somehow these are both 4 too far, so subtract 8. */ 1403 ret_offset = 1404 s->output_offset 1405 + my_offset 1406 + s->output_section->vma 1407 - (input_section->output_offset 1408 + input_section->output_section->vma 1409 + rel->r_vaddr) 1410 - 8; 1411 1412 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); 1413 1414 bfd_put_32 (output_bfd, (bfd_vma) tmp, 1415 contents + rel->r_vaddr - input_section->vma); 1416 done = 1; 1417 } 1418 } 1419 1420#ifndef ARM_WINCE 1421 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */ 1422 else if (howto->type == ARM_THUMB23) 1423 { 1424 if ( h->symbol_class == C_EXT 1425 || h->symbol_class == C_STAT 1426 || h->symbol_class == C_LABEL) 1427 { 1428 /* Thumb code calling an ARM function. */ 1429 asection * s = 0; 1430 bfd_vma my_offset; 1431 unsigned long int tmp; 1432 long int ret_offset; 1433 struct coff_link_hash_entry * myh; 1434 struct coff_arm_link_hash_table * globals; 1435 1436 myh = find_thumb_glue (info, name, input_bfd); 1437 if (myh == NULL) 1438 return false; 1439 1440 globals = coff_arm_hash_table (info); 1441 1442 BFD_ASSERT (globals != NULL); 1443 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 1444 1445 my_offset = myh->root.u.def.value; 1446 1447 s = bfd_get_section_by_name (globals->bfd_of_glue_owner, 1448 THUMB2ARM_GLUE_SECTION_NAME); 1449 1450 BFD_ASSERT (s != NULL); 1451 BFD_ASSERT (s->contents != NULL); 1452 BFD_ASSERT (s->output_section != NULL); 1453 1454 if ((my_offset & 0x01) == 0x01) 1455 { 1456 if (h_sec->owner != NULL 1457 && INTERWORK_SET (h_sec->owner) 1458 && ! INTERWORK_FLAG (h_sec->owner) 1459 && ! globals->support_old_code) 1460 _bfd_error_handler 1461 /* xgettext:c-format */ 1462 (_("%pB(%s): warning: interworking not enabled; " 1463 "first occurrence: %pB: thumb call to arm; " 1464 "consider relinking with --support-old-code " 1465 "enabled"), 1466 h_sec->owner, name, input_bfd); 1467 1468 -- my_offset; 1469 myh->root.u.def.value = my_offset; 1470 1471 if (globals->support_old_code) 1472 { 1473 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn, 1474 s->contents + my_offset); 1475 1476 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn, 1477 s->contents + my_offset + 2); 1478 1479 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn, 1480 s->contents + my_offset + 4); 1481 1482 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn, 1483 s->contents + my_offset + 6); 1484 1485 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn, 1486 s->contents + my_offset + 8); 1487 1488 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn, 1489 s->contents + my_offset + 12); 1490 1491 /* Store the address of the function in the last word of the stub. */ 1492 bfd_put_32 (output_bfd, h_val, 1493 s->contents + my_offset + 16); 1494 1495 if (info->base_file 1496 && !arm_emit_base_file_entry (info, 1497 output_bfd, s, 1498 my_offset + 16)) 1499 return false; 1500 } 1501 else 1502 { 1503 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn, 1504 s->contents + my_offset); 1505 1506 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn, 1507 s->contents + my_offset + 2); 1508 1509 ret_offset = 1510 /* Address of destination of the stub. */ 1511 ((bfd_signed_vma) h_val) 1512 - ((bfd_signed_vma) 1513 /* Offset from the start of the current section to the start of the stubs. */ 1514 (s->output_offset 1515 /* Offset of the start of this stub from the start of the stubs. */ 1516 + my_offset 1517 /* Address of the start of the current section. */ 1518 + s->output_section->vma) 1519 /* The branch instruction is 4 bytes into the stub. */ 1520 + 4 1521 /* ARM branches work from the pc of the instruction + 8. */ 1522 + 8); 1523 1524 bfd_put_32 (output_bfd, 1525 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), 1526 s->contents + my_offset + 4); 1527 1528 } 1529 } 1530 1531 BFD_ASSERT (my_offset <= globals->thumb_glue_size); 1532 1533 /* Now go back and fix up the original BL insn to point 1534 to here. */ 1535 ret_offset = 1536 s->output_offset 1537 + my_offset 1538 - (input_section->output_offset 1539 + rel->r_vaddr) 1540 -4; 1541 1542 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr 1543 - input_section->vma); 1544 1545 bfd_put_32 (output_bfd, 1546 (bfd_vma) insert_thumb_branch (tmp, 1547 ret_offset), 1548 contents + rel->r_vaddr - input_section->vma); 1549 1550 done = 1; 1551 } 1552 } 1553#endif 1554 } 1555 1556 /* If the relocation type and destination symbol does not 1557 fall into one of the above categories, then we can just 1558 perform a direct link. */ 1559 1560 if (done) 1561 rstat = bfd_reloc_ok; 1562 else 1563 if ( h->root.type == bfd_link_hash_defined 1564 || h->root.type == bfd_link_hash_defweak) 1565 { 1566 asection *sec; 1567 1568 sec = h->root.u.def.section; 1569 val = (h->root.u.def.value 1570 + sec->output_section->vma 1571 + sec->output_offset); 1572 } 1573 1574 else if (! bfd_link_relocatable (info)) 1575 (*info->callbacks->undefined_symbol) 1576 (info, h->root.root.string, input_bfd, input_section, 1577 rel->r_vaddr - input_section->vma, true); 1578 } 1579 1580 /* Emit a reloc if the backend thinks it needs it. */ 1581 if (info->base_file 1582 && sym 1583 && pe_data(output_bfd)->in_reloc_p(output_bfd, howto) 1584 && !arm_emit_base_file_entry (info, output_bfd, input_section, 1585 rel->r_vaddr)) 1586 return false; 1587 1588 if (done) 1589 rstat = bfd_reloc_ok; 1590#ifndef ARM_WINCE 1591 /* Only perform this fix during the final link, not a relocatable link. */ 1592 else if (! bfd_link_relocatable (info) 1593 && howto->type == ARM_THUMB23) 1594 { 1595 /* This is pretty much a copy of what the default 1596 _bfd_final_link_relocate and _bfd_relocate_contents 1597 routines do to perform a relocation, with special 1598 processing for the split addressing of the Thumb BL 1599 instruction. Again, it would probably be simpler adding a 1600 ThumbBRANCH23 specific macro expansion into the default 1601 code. */ 1602 1603 bfd_vma address = rel->r_vaddr - input_section->vma; 1604 1605 if (address > high_address) 1606 rstat = bfd_reloc_outofrange; 1607 else 1608 { 1609 bfd_vma relocation = val + addend; 1610 int size = bfd_get_reloc_size (howto); 1611 bool overflow = false; 1612 bfd_byte *location = contents + address; 1613 bfd_vma x = bfd_get_32 (input_bfd, location); 1614 bfd_vma src_mask = 0x007FFFFE; 1615 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; 1616 bfd_signed_vma reloc_signed_min = ~reloc_signed_max; 1617 bfd_vma check; 1618 bfd_signed_vma signed_check; 1619 bfd_vma add; 1620 bfd_signed_vma signed_add; 1621 1622 BFD_ASSERT (size == 4); 1623 1624 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */ 1625 relocation -= (input_section->output_section->vma 1626 + input_section->output_offset); 1627 1628 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */ 1629 relocation -= address; 1630 1631 /* No need to negate the relocation with BRANCH23. */ 1632 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */ 1633 /* howto->rightshift == 1 */ 1634 1635 /* Drop unwanted bits from the value we are relocating to. */ 1636 check = relocation >> howto->rightshift; 1637 1638 /* If this is a signed value, the rightshift just dropped 1639 leading 1 bits (assuming twos complement). */ 1640 if ((bfd_signed_vma) relocation >= 0) 1641 signed_check = check; 1642 else 1643 signed_check = (check 1644 | ((bfd_vma) - 1 1645 & ~((bfd_vma) - 1 >> howto->rightshift))); 1646 1647 /* Get the value from the object file. */ 1648 if (bfd_big_endian (input_bfd)) 1649 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1); 1650 else 1651 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15)); 1652 1653 /* Get the value from the object file with an appropriate sign. 1654 The expression involving howto->src_mask isolates the upper 1655 bit of src_mask. If that bit is set in the value we are 1656 adding, it is negative, and we subtract out that number times 1657 two. If src_mask includes the highest possible bit, then we 1658 can not get the upper bit, but that does not matter since 1659 signed_add needs no adjustment to become negative in that 1660 case. */ 1661 signed_add = add; 1662 1663 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0) 1664 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1; 1665 1666 /* howto->bitpos == 0 */ 1667 /* Add the value from the object file, shifted so that it is a 1668 straight number. */ 1669 signed_check += signed_add; 1670 relocation += signed_add; 1671 1672 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed); 1673 1674 /* Assumes two's complement. */ 1675 if ( signed_check > reloc_signed_max 1676 || signed_check < reloc_signed_min) 1677 overflow = true; 1678 1679 /* Put the relocation into the correct bits. 1680 For a BLX instruction, make sure that the relocation is rounded up 1681 to a word boundary. This follows the semantics of the instruction 1682 which specifies that bit 1 of the target address will come from bit 1683 1 of the base address. */ 1684 if (bfd_big_endian (input_bfd)) 1685 { 1686 if ((x & 0x1800) == 0x0800 && (relocation & 0x02)) 1687 relocation += 2; 1688 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000)); 1689 } 1690 else 1691 { 1692 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02)) 1693 relocation += 2; 1694 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff)); 1695 } 1696 1697 /* Add the relocation to the correct bits of X. */ 1698 x = ((x & ~howto->dst_mask) | relocation); 1699 1700 /* Put the relocated value back in the object file. */ 1701 bfd_put_32 (input_bfd, x, location); 1702 1703 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok; 1704 } 1705 } 1706#endif 1707 else 1708 if (bfd_link_relocatable (info) && ! howto->partial_inplace) 1709 rstat = bfd_reloc_ok; 1710 else 1711 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section, 1712 contents, 1713 rel->r_vaddr - input_section->vma, 1714 val, addend); 1715 /* Only perform this fix during the final link, not a relocatable link. */ 1716 if (! bfd_link_relocatable (info) 1717 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32)) 1718 { 1719 /* Determine if we need to set the bottom bit of a relocated address 1720 because the address is the address of a Thumb code symbol. */ 1721 int patchit = false; 1722 1723 if (h != NULL 1724 && ( h->symbol_class == C_THUMBSTATFUNC 1725 || h->symbol_class == C_THUMBEXTFUNC)) 1726 { 1727 patchit = true; 1728 } 1729 else if (sym != NULL 1730 && sym->n_scnum > N_UNDEF) 1731 { 1732 /* No hash entry - use the symbol instead. */ 1733 if ( sym->n_sclass == C_THUMBSTATFUNC 1734 || sym->n_sclass == C_THUMBEXTFUNC) 1735 patchit = true; 1736 } 1737 1738 if (patchit) 1739 { 1740 bfd_byte * location = contents + rel->r_vaddr - input_section->vma; 1741 bfd_vma x = bfd_get_32 (input_bfd, location); 1742 1743 bfd_put_32 (input_bfd, x | 1, location); 1744 } 1745 } 1746 1747 switch (rstat) 1748 { 1749 default: 1750 abort (); 1751 case bfd_reloc_ok: 1752 break; 1753 case bfd_reloc_outofrange: 1754 _bfd_error_handler 1755 /* xgettext:c-format */ 1756 (_("%pB: bad reloc address %#" PRIx64 " in section `%pA'"), 1757 input_bfd, (uint64_t) rel->r_vaddr, input_section); 1758 return false; 1759 case bfd_reloc_overflow: 1760 { 1761 const char *name; 1762 char buf[SYMNMLEN + 1]; 1763 1764 if (symndx == -1) 1765 name = "*ABS*"; 1766 else if (h != NULL) 1767 name = NULL; 1768 else 1769 { 1770 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf); 1771 if (name == NULL) 1772 return false; 1773 } 1774 1775 (*info->callbacks->reloc_overflow) 1776 (info, (h ? &h->root : NULL), name, howto->name, 1777 (bfd_vma) 0, input_bfd, input_section, 1778 rel->r_vaddr - input_section->vma); 1779 } 1780 } 1781 } 1782 1783 return true; 1784} 1785 1786#ifndef COFF_IMAGE_WITH_PE 1787 1788bool 1789bfd_arm_allocate_interworking_sections (struct bfd_link_info * info) 1790{ 1791 asection * s; 1792 bfd_byte * foo; 1793 struct coff_arm_link_hash_table * globals; 1794 1795 globals = coff_arm_hash_table (info); 1796 1797 BFD_ASSERT (globals != NULL); 1798 1799 if (globals->arm_glue_size != 0) 1800 { 1801 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 1802 1803 s = bfd_get_section_by_name 1804 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); 1805 1806 BFD_ASSERT (s != NULL); 1807 1808 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size); 1809 1810 s->size = globals->arm_glue_size; 1811 s->contents = foo; 1812 } 1813 1814 if (globals->thumb_glue_size != 0) 1815 { 1816 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 1817 1818 s = bfd_get_section_by_name 1819 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); 1820 1821 BFD_ASSERT (s != NULL); 1822 1823 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size); 1824 1825 s->size = globals->thumb_glue_size; 1826 s->contents = foo; 1827 } 1828 1829 return true; 1830} 1831 1832static void 1833record_arm_to_thumb_glue (struct bfd_link_info * info, 1834 struct coff_link_hash_entry * h) 1835{ 1836 const char * name = h->root.root.string; 1837 register asection * s; 1838 char * tmp_name; 1839 struct coff_link_hash_entry * myh; 1840 struct bfd_link_hash_entry * bh; 1841 struct coff_arm_link_hash_table * globals; 1842 bfd_vma val; 1843 size_t amt; 1844 1845 globals = coff_arm_hash_table (info); 1846 1847 BFD_ASSERT (globals != NULL); 1848 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 1849 1850 s = bfd_get_section_by_name 1851 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); 1852 1853 BFD_ASSERT (s != NULL); 1854 1855 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1; 1856 tmp_name = bfd_malloc (amt); 1857 1858 BFD_ASSERT (tmp_name); 1859 1860 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); 1861 1862 myh = coff_link_hash_lookup 1863 (coff_hash_table (info), tmp_name, false, false, true); 1864 1865 if (myh != NULL) 1866 { 1867 free (tmp_name); 1868 /* We've already seen this guy. */ 1869 return; 1870 } 1871 1872 /* The only trick here is using globals->arm_glue_size as the value. Even 1873 though the section isn't allocated yet, this is where we will be putting 1874 it. */ 1875 bh = NULL; 1876 val = globals->arm_glue_size + 1; 1877 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name, 1878 BSF_GLOBAL, s, val, NULL, true, false, &bh); 1879 1880 free (tmp_name); 1881 1882 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE; 1883 1884 return; 1885} 1886 1887#ifndef ARM_WINCE 1888static void 1889record_thumb_to_arm_glue (struct bfd_link_info * info, 1890 struct coff_link_hash_entry * h) 1891{ 1892 const char * name = h->root.root.string; 1893 asection * s; 1894 char * tmp_name; 1895 struct coff_link_hash_entry * myh; 1896 struct bfd_link_hash_entry * bh; 1897 struct coff_arm_link_hash_table * globals; 1898 bfd_vma val; 1899 size_t amt; 1900 1901 globals = coff_arm_hash_table (info); 1902 1903 BFD_ASSERT (globals != NULL); 1904 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 1905 1906 s = bfd_get_section_by_name 1907 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); 1908 1909 BFD_ASSERT (s != NULL); 1910 1911 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1; 1912 tmp_name = bfd_malloc (amt); 1913 1914 BFD_ASSERT (tmp_name); 1915 1916 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); 1917 1918 myh = coff_link_hash_lookup 1919 (coff_hash_table (info), tmp_name, false, false, true); 1920 1921 if (myh != NULL) 1922 { 1923 free (tmp_name); 1924 /* We've already seen this guy. */ 1925 return; 1926 } 1927 1928 bh = NULL; 1929 val = globals->thumb_glue_size + 1; 1930 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name, 1931 BSF_GLOBAL, s, val, NULL, true, false, &bh); 1932 1933 /* If we mark it 'thumb', the disassembler will do a better job. */ 1934 myh = (struct coff_link_hash_entry *) bh; 1935 myh->symbol_class = C_THUMBEXTFUNC; 1936 1937 free (tmp_name); 1938 1939 /* Allocate another symbol to mark where we switch to arm mode. */ 1940 1941#define CHANGE_TO_ARM "__%s_change_to_arm" 1942#define BACK_FROM_ARM "__%s_back_from_arm" 1943 1944 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1; 1945 tmp_name = bfd_malloc (amt); 1946 1947 BFD_ASSERT (tmp_name); 1948 1949 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name); 1950 1951 bh = NULL; 1952 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4); 1953 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name, 1954 BSF_LOCAL, s, val, NULL, true, false, &bh); 1955 1956 free (tmp_name); 1957 1958 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE; 1959 1960 return; 1961} 1962#endif /* not ARM_WINCE */ 1963 1964/* Select a BFD to be used to hold the sections used by the glue code. 1965 This function is called from the linker scripts in ld/emultempl/ 1966 {armcoff/pe}.em */ 1967 1968bool 1969bfd_arm_get_bfd_for_interworking (bfd * abfd, 1970 struct bfd_link_info * info) 1971{ 1972 struct coff_arm_link_hash_table * globals; 1973 flagword flags; 1974 asection * sec; 1975 1976 /* If we are only performing a partial link do not bother 1977 getting a bfd to hold the glue. */ 1978 if (bfd_link_relocatable (info)) 1979 return true; 1980 1981 globals = coff_arm_hash_table (info); 1982 1983 BFD_ASSERT (globals != NULL); 1984 1985 if (globals->bfd_of_glue_owner != NULL) 1986 return true; 1987 1988 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); 1989 1990 if (sec == NULL) 1991 { 1992 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 1993 | SEC_CODE | SEC_READONLY); 1994 sec = bfd_make_section_with_flags (abfd, ARM2THUMB_GLUE_SECTION_NAME, 1995 flags); 1996 if (sec == NULL 1997 || !bfd_set_section_alignment (sec, 2)) 1998 return false; 1999 } 2000 2001 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME); 2002 2003 if (sec == NULL) 2004 { 2005 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 2006 | SEC_CODE | SEC_READONLY); 2007 sec = bfd_make_section_with_flags (abfd, THUMB2ARM_GLUE_SECTION_NAME, 2008 flags); 2009 2010 if (sec == NULL 2011 || !bfd_set_section_alignment (sec, 2)) 2012 return false; 2013 } 2014 2015 /* Save the bfd for later use. */ 2016 globals->bfd_of_glue_owner = abfd; 2017 2018 return true; 2019} 2020 2021bool 2022bfd_arm_process_before_allocation (bfd * abfd, 2023 struct bfd_link_info * info, 2024 int support_old_code) 2025{ 2026 asection * sec; 2027 struct coff_arm_link_hash_table * globals; 2028 2029 /* If we are only performing a partial link do not bother 2030 to construct any glue. */ 2031 if (bfd_link_relocatable (info)) 2032 return true; 2033 2034 /* Here we have a bfd that is to be included on the link. We have a hook 2035 to do reloc rummaging, before section sizes are nailed down. */ 2036 _bfd_coff_get_external_symbols (abfd); 2037 2038 globals = coff_arm_hash_table (info); 2039 2040 BFD_ASSERT (globals != NULL); 2041 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 2042 2043 globals->support_old_code = support_old_code; 2044 2045 /* Rummage around all the relocs and map the glue vectors. */ 2046 sec = abfd->sections; 2047 2048 if (sec == NULL) 2049 return true; 2050 2051 for (; sec != NULL; sec = sec->next) 2052 { 2053 struct internal_reloc * i; 2054 struct internal_reloc * rel; 2055 2056 if (sec->reloc_count == 0) 2057 continue; 2058 2059 /* Load the relocs. */ 2060 /* FIXME: there may be a storage leak here. */ 2061 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0); 2062 2063 BFD_ASSERT (i != 0); 2064 2065 for (rel = i; rel < i + sec->reloc_count; ++rel) 2066 { 2067 unsigned short r_type = rel->r_type; 2068 long symndx; 2069 struct coff_link_hash_entry * h; 2070 2071 symndx = rel->r_symndx; 2072 2073 /* If the relocation is not against a symbol it cannot concern us. */ 2074 if (symndx == -1) 2075 continue; 2076 2077 /* If the index is outside of the range of our table, something has gone wrong. */ 2078 if (symndx >= obj_conv_table_size (abfd)) 2079 { 2080 /* xgettext:c-format */ 2081 _bfd_error_handler (_("%pB: illegal symbol index in reloc: %ld"), 2082 abfd, symndx); 2083 continue; 2084 } 2085 2086 h = obj_coff_sym_hashes (abfd)[symndx]; 2087 2088 /* If the relocation is against a static symbol it must be within 2089 the current section and so cannot be a cross ARM/Thumb relocation. */ 2090 if (h == NULL) 2091 continue; 2092 2093 switch (r_type) 2094 { 2095 case ARM_26: 2096 /* This one is a call from arm code. We need to look up 2097 the target of the call. If it is a thumb target, we 2098 insert glue. */ 2099 2100 if (h->symbol_class == C_THUMBEXTFUNC) 2101 record_arm_to_thumb_glue (info, h); 2102 break; 2103 2104#ifndef ARM_WINCE 2105 case ARM_THUMB23: 2106 /* This one is a call from thumb code. We used to look 2107 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look 2108 up the target of the call. If it is an arm target, we 2109 insert glue. If the symbol does not exist it will be 2110 given a class of C_EXT and so we will generate a stub 2111 for it. This is not really a problem, since the link 2112 is doomed anyway. */ 2113 2114 switch (h->symbol_class) 2115 { 2116 case C_EXT: 2117 case C_STAT: 2118 case C_LABEL: 2119 record_thumb_to_arm_glue (info, h); 2120 break; 2121 default: 2122 ; 2123 } 2124 break; 2125#endif 2126 2127 default: 2128 break; 2129 } 2130 } 2131 } 2132 2133 return true; 2134} 2135 2136#endif /* ! defined (COFF_IMAGE_WITH_PE) */ 2137 2138#define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup 2139#define coff_bfd_reloc_name_lookup coff_arm_reloc_name_lookup 2140#define coff_relocate_section coff_arm_relocate_section 2141#define coff_bfd_is_local_label_name coff_arm_is_local_label_name 2142#define coff_adjust_symndx coff_arm_adjust_symndx 2143#define coff_link_output_has_begun coff_arm_link_output_has_begun 2144#define coff_final_link_postscript coff_arm_final_link_postscript 2145#define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data 2146#define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data 2147#define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags 2148#define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data 2149#define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create 2150 2151/* When doing a relocatable link, we want to convert ARM_26 relocs 2152 into ARM_26D relocs. */ 2153 2154static bool 2155coff_arm_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED, 2156 struct bfd_link_info *info ATTRIBUTE_UNUSED, 2157 bfd *ibfd, 2158 asection *sec, 2159 struct internal_reloc *irel, 2160 bool *adjustedp) 2161{ 2162 if (irel->r_type == ARM_26) 2163 { 2164 struct coff_link_hash_entry *h; 2165 2166 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx]; 2167 if (h != NULL 2168 && (h->root.type == bfd_link_hash_defined 2169 || h->root.type == bfd_link_hash_defweak) 2170 && h->root.u.def.section->output_section == sec->output_section) 2171 irel->r_type = ARM_26D; 2172 } 2173 *adjustedp = false; 2174 return true; 2175} 2176 2177/* Called when merging the private data areas of two BFDs. 2178 This is important as it allows us to detect if we are 2179 attempting to merge binaries compiled for different ARM 2180 targets, eg different CPUs or different APCS's. */ 2181 2182static bool 2183coff_arm_merge_private_bfd_data (bfd * ibfd, struct bfd_link_info *info) 2184{ 2185 bfd *obfd = info->output_bfd; 2186 BFD_ASSERT (ibfd != NULL && obfd != NULL); 2187 2188 if (ibfd == obfd) 2189 return true; 2190 2191 /* If the two formats are different we cannot merge anything. 2192 This is not an error, since it is permissable to change the 2193 input and output formats. */ 2194 if ( ibfd->xvec->flavour != bfd_target_coff_flavour 2195 || obfd->xvec->flavour != bfd_target_coff_flavour) 2196 return true; 2197 2198 /* Determine what should happen if the input ARM architecture 2199 does not match the output ARM architecture. */ 2200 if (! bfd_arm_merge_machines (ibfd, obfd)) 2201 return false; 2202 2203 /* Verify that the APCS is the same for the two BFDs. */ 2204 if (APCS_SET (ibfd)) 2205 { 2206 if (APCS_SET (obfd)) 2207 { 2208 /* If the src and dest have different APCS flag bits set, fail. */ 2209 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd)) 2210 { 2211 _bfd_error_handler 2212 /* xgettext: c-format */ 2213 (_("error: %pB is compiled for APCS-%d, " 2214 "whereas %pB is compiled for APCS-%d"), 2215 ibfd, APCS_26_FLAG (ibfd) ? 26 : 32, 2216 obfd, APCS_26_FLAG (obfd) ? 26 : 32 2217 ); 2218 2219 bfd_set_error (bfd_error_wrong_format); 2220 return false; 2221 } 2222 2223 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd)) 2224 { 2225 if (APCS_FLOAT_FLAG (ibfd)) 2226 /* xgettext: c-format */ 2227 _bfd_error_handler 2228 (_("error: %pB passes floats in float registers, " 2229 "whereas %pB passes them in integer registers"), 2230 ibfd, obfd); 2231 else 2232 /* xgettext: c-format */ 2233 _bfd_error_handler 2234 (_("error: %pB passes floats in integer registers, " 2235 "whereas %pB passes them in float registers"), 2236 ibfd, obfd); 2237 2238 bfd_set_error (bfd_error_wrong_format); 2239 return false; 2240 } 2241 2242 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd)) 2243 { 2244 if (PIC_FLAG (ibfd)) 2245 /* xgettext: c-format */ 2246 _bfd_error_handler 2247 (_("error: %pB is compiled as position independent code, " 2248 "whereas target %pB is absolute position"), 2249 ibfd, obfd); 2250 else 2251 /* xgettext: c-format */ 2252 _bfd_error_handler 2253 (_("error: %pB is compiled as absolute position code, " 2254 "whereas target %pB is position independent"), 2255 ibfd, obfd); 2256 2257 bfd_set_error (bfd_error_wrong_format); 2258 return false; 2259 } 2260 } 2261 else 2262 { 2263 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd)); 2264 2265 /* Set up the arch and fields as well as these are probably wrong. */ 2266 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); 2267 } 2268 } 2269 2270 /* Check the interworking support. */ 2271 if (INTERWORK_SET (ibfd)) 2272 { 2273 if (INTERWORK_SET (obfd)) 2274 { 2275 /* If the src and dest differ in their interworking issue a warning. */ 2276 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd)) 2277 { 2278 if (INTERWORK_FLAG (ibfd)) 2279 /* xgettext: c-format */ 2280 _bfd_error_handler (_("warning: %pB supports interworking, " 2281 "whereas %pB does not"), 2282 ibfd, obfd); 2283 else 2284 /* xgettext: c-format */ 2285 _bfd_error_handler 2286 (_("warning: %pB does not support interworking, " 2287 "whereas %pB does"), 2288 ibfd, obfd); 2289 } 2290 } 2291 else 2292 { 2293 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd)); 2294 } 2295 } 2296 2297 return true; 2298} 2299 2300/* Display the flags field. */ 2301 2302static bool 2303coff_arm_print_private_bfd_data (bfd * abfd, void * ptr) 2304{ 2305 FILE * file = (FILE *) ptr; 2306 2307 BFD_ASSERT (abfd != NULL && ptr != NULL); 2308 2309 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags); 2310 2311 if (APCS_SET (abfd)) 2312 { 2313 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */ 2314 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32); 2315 2316 if (APCS_FLOAT_FLAG (abfd)) 2317 fprintf (file, _(" [floats passed in float registers]")); 2318 else 2319 fprintf (file, _(" [floats passed in integer registers]")); 2320 2321 if (PIC_FLAG (abfd)) 2322 fprintf (file, _(" [position independent]")); 2323 else 2324 fprintf (file, _(" [absolute position]")); 2325 } 2326 2327 if (! INTERWORK_SET (abfd)) 2328 fprintf (file, _(" [interworking flag not initialised]")); 2329 else if (INTERWORK_FLAG (abfd)) 2330 fprintf (file, _(" [interworking supported]")); 2331 else 2332 fprintf (file, _(" [interworking not supported]")); 2333 2334 fputc ('\n', file); 2335 2336 return true; 2337} 2338 2339/* Copies the given flags into the coff_tdata.flags field. 2340 Typically these flags come from the f_flags[] field of 2341 the COFF filehdr structure, which contains important, 2342 target specific information. 2343 Note: Although this function is static, it is explicitly 2344 called from both coffcode.h and peicode.h. */ 2345 2346static bool 2347_bfd_coff_arm_set_private_flags (bfd * abfd, flagword flags) 2348{ 2349 flagword flag; 2350 2351 BFD_ASSERT (abfd != NULL); 2352 2353 flag = (flags & F_APCS26) ? F_APCS_26 : 0; 2354 2355 /* Make sure that the APCS field has not been initialised to the opposite 2356 value. */ 2357 if (APCS_SET (abfd) 2358 && ( (APCS_26_FLAG (abfd) != flag) 2359 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT)) 2360 || (PIC_FLAG (abfd) != (flags & F_PIC)) 2361 )) 2362 return false; 2363 2364 flag |= (flags & (F_APCS_FLOAT | F_PIC)); 2365 2366 SET_APCS_FLAGS (abfd, flag); 2367 2368 flag = (flags & F_INTERWORK); 2369 2370 /* If the BFD has already had its interworking flag set, but it 2371 is different from the value that we have been asked to set, 2372 then assume that that merged code will not support interworking 2373 and set the flag accordingly. */ 2374 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag)) 2375 { 2376 if (flag) 2377 _bfd_error_handler (_("warning: not setting interworking flag of %pB since it has already been specified as non-interworking"), 2378 abfd); 2379 else 2380 _bfd_error_handler (_("warning: clearing the interworking flag of %pB due to outside request"), 2381 abfd); 2382 flag = 0; 2383 } 2384 2385 SET_INTERWORK_FLAG (abfd, flag); 2386 2387 return true; 2388} 2389 2390/* Copy the important parts of the target specific data 2391 from one instance of a BFD to another. */ 2392 2393static bool 2394coff_arm_copy_private_bfd_data (bfd * src, bfd * dest) 2395{ 2396 BFD_ASSERT (src != NULL && dest != NULL); 2397 2398 if (src == dest) 2399 return true; 2400 2401 /* If the destination is not in the same format as the source, do not do 2402 the copy. */ 2403 if (src->xvec != dest->xvec) 2404 return true; 2405 2406 /* Copy the flags field. */ 2407 if (APCS_SET (src)) 2408 { 2409 if (APCS_SET (dest)) 2410 { 2411 /* If the src and dest have different APCS flag bits set, fail. */ 2412 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src)) 2413 return false; 2414 2415 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src)) 2416 return false; 2417 2418 if (PIC_FLAG (dest) != PIC_FLAG (src)) 2419 return false; 2420 } 2421 else 2422 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src) 2423 | PIC_FLAG (src)); 2424 } 2425 2426 if (INTERWORK_SET (src)) 2427 { 2428 if (INTERWORK_SET (dest)) 2429 { 2430 /* If the src and dest have different interworking flags then turn 2431 off the interworking bit. */ 2432 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src)) 2433 { 2434 if (INTERWORK_FLAG (dest)) 2435 { 2436 /* xgettext:c-format */ 2437 _bfd_error_handler 2438 (_("warning: clearing the interworking flag of %pB " 2439 "because non-interworking code in %pB has been " 2440 "linked with it"), 2441 dest, src); 2442 } 2443 2444 SET_INTERWORK_FLAG (dest, 0); 2445 } 2446 } 2447 else 2448 { 2449 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src)); 2450 } 2451 } 2452 2453 return true; 2454} 2455 2456/* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX 2457 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */ 2458#ifndef LOCAL_LABEL_PREFIX 2459#define LOCAL_LABEL_PREFIX "" 2460#endif 2461#ifndef USER_LABEL_PREFIX 2462#define USER_LABEL_PREFIX "_" 2463#endif 2464 2465/* Like _bfd_coff_is_local_label_name, but 2466 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be 2467 non-local. 2468 b) Allow other prefixes than ".", e.g. an empty prefix would cause all 2469 labels of the form Lxxx to be stripped. */ 2470 2471static bool 2472coff_arm_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED, 2473 const char * name) 2474{ 2475#ifdef USER_LABEL_PREFIX 2476 if (USER_LABEL_PREFIX[0] != 0) 2477 { 2478 size_t len = strlen (USER_LABEL_PREFIX); 2479 2480 if (strncmp (name, USER_LABEL_PREFIX, len) == 0) 2481 return false; 2482 } 2483#endif 2484 2485#ifdef LOCAL_LABEL_PREFIX 2486 /* If there is a prefix for local labels then look for this. 2487 If the prefix exists, but it is empty, then ignore the test. */ 2488 2489 if (LOCAL_LABEL_PREFIX[0] != 0) 2490 { 2491 size_t len = strlen (LOCAL_LABEL_PREFIX); 2492 2493 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0) 2494 return false; 2495 2496 /* Perform the checks below for the rest of the name. */ 2497 name += len; 2498 } 2499#endif 2500 2501 return name[0] == 'L'; 2502} 2503 2504/* This piece of machinery exists only to guarantee that the bfd that holds 2505 the glue section is written last. 2506 2507 This does depend on bfd_make_section attaching a new section to the 2508 end of the section list for the bfd. */ 2509 2510static bool 2511coff_arm_link_output_has_begun (bfd * sub, struct coff_final_link_info * info) 2512{ 2513 return (sub->output_has_begun 2514 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner); 2515} 2516 2517static bool 2518coff_arm_final_link_postscript (bfd * abfd ATTRIBUTE_UNUSED, 2519 struct coff_final_link_info * pfinfo) 2520{ 2521 struct coff_arm_link_hash_table * globals; 2522 2523 globals = coff_arm_hash_table (pfinfo->info); 2524 2525 BFD_ASSERT (globals != NULL); 2526 2527 if (globals->bfd_of_glue_owner != NULL) 2528 { 2529 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner)) 2530 return false; 2531 2532 globals->bfd_of_glue_owner->output_has_begun = true; 2533 } 2534 2535 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION); 2536} 2537 2538#ifndef bfd_pe_print_pdata 2539#define bfd_pe_print_pdata NULL 2540#endif 2541 2542#include "coffcode.h" 2543 2544#ifndef TARGET_LITTLE_SYM 2545#define TARGET_LITTLE_SYM arm_coff_le_vec 2546#endif 2547#ifndef TARGET_LITTLE_NAME 2548#define TARGET_LITTLE_NAME "coff-arm-little" 2549#endif 2550#ifndef TARGET_BIG_SYM 2551#define TARGET_BIG_SYM arm_coff_be_vec 2552#endif 2553#ifndef TARGET_BIG_NAME 2554#define TARGET_BIG_NAME "coff-arm-big" 2555#endif 2556 2557#ifndef TARGET_UNDERSCORE 2558#define TARGET_UNDERSCORE 0 2559#endif 2560 2561#ifndef EXTRA_S_FLAGS 2562#ifdef COFF_WITH_PE 2563#define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES) 2564#else 2565#define EXTRA_S_FLAGS SEC_CODE 2566#endif 2567#endif 2568 2569/* Forward declaration for use initialising alternative_target field. */ 2570extern const bfd_target TARGET_BIG_SYM ; 2571 2572/* Target vectors. */ 2573CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE) 2574CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE) 2575