1/* 32-bit ELF support for ARM 2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 3 Free Software Foundation, Inc. 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#include "bfd.h" 22#include "sysdep.h" 23#include "libiberty.h" 24#include "libbfd.h" 25#include "elf-bfd.h" 26#include "elf-vxworks.h" 27#include "elf/arm.h" 28 29#ifndef NUM_ELEM 30#define NUM_ELEM(a) (sizeof (a) / (sizeof (a)[0])) 31#endif 32 33/* Return the relocation section associated with NAME. HTAB is the 34 bfd's elf32_arm_link_hash_entry. */ 35#define RELOC_SECTION(HTAB, NAME) \ 36 ((HTAB)->use_rel ? ".rel" NAME : ".rela" NAME) 37 38/* Return size of a relocation entry. HTAB is the bfd's 39 elf32_arm_link_hash_entry. */ 40#define RELOC_SIZE(HTAB) \ 41 ((HTAB)->use_rel \ 42 ? sizeof (Elf32_External_Rel) \ 43 : sizeof (Elf32_External_Rela)) 44 45/* Return function to swap relocations in. HTAB is the bfd's 46 elf32_arm_link_hash_entry. */ 47#define SWAP_RELOC_IN(HTAB) \ 48 ((HTAB)->use_rel \ 49 ? bfd_elf32_swap_reloc_in \ 50 : bfd_elf32_swap_reloca_in) 51 52/* Return function to swap relocations out. HTAB is the bfd's 53 elf32_arm_link_hash_entry. */ 54#define SWAP_RELOC_OUT(HTAB) \ 55 ((HTAB)->use_rel \ 56 ? bfd_elf32_swap_reloc_out \ 57 : bfd_elf32_swap_reloca_out) 58 59#define elf_info_to_howto 0 60#define elf_info_to_howto_rel elf32_arm_info_to_howto 61 62#define ARM_ELF_ABI_VERSION 0 63#define ARM_ELF_OS_ABI_VERSION ELFOSABI_ARM 64 65static const struct elf_backend_data elf32_arm_vxworks_bed; 66 67/* Note: code such as elf32_arm_reloc_type_lookup expect to use e.g. 68 R_ARM_PC24 as an index into this, and find the R_ARM_PC24 HOWTO 69 in that slot. */ 70 71static reloc_howto_type elf32_arm_howto_table_1[] = 72{ 73 /* No relocation */ 74 HOWTO (R_ARM_NONE, /* type */ 75 0, /* rightshift */ 76 0, /* size (0 = byte, 1 = short, 2 = long) */ 77 0, /* bitsize */ 78 FALSE, /* pc_relative */ 79 0, /* bitpos */ 80 complain_overflow_dont,/* complain_on_overflow */ 81 bfd_elf_generic_reloc, /* special_function */ 82 "R_ARM_NONE", /* name */ 83 FALSE, /* partial_inplace */ 84 0, /* src_mask */ 85 0, /* dst_mask */ 86 FALSE), /* pcrel_offset */ 87 88 HOWTO (R_ARM_PC24, /* type */ 89 2, /* rightshift */ 90 2, /* size (0 = byte, 1 = short, 2 = long) */ 91 24, /* bitsize */ 92 TRUE, /* pc_relative */ 93 0, /* bitpos */ 94 complain_overflow_signed,/* complain_on_overflow */ 95 bfd_elf_generic_reloc, /* special_function */ 96 "R_ARM_PC24", /* name */ 97 FALSE, /* partial_inplace */ 98 0x00ffffff, /* src_mask */ 99 0x00ffffff, /* dst_mask */ 100 TRUE), /* pcrel_offset */ 101 102 /* 32 bit absolute */ 103 HOWTO (R_ARM_ABS32, /* type */ 104 0, /* rightshift */ 105 2, /* size (0 = byte, 1 = short, 2 = long) */ 106 32, /* bitsize */ 107 FALSE, /* pc_relative */ 108 0, /* bitpos */ 109 complain_overflow_bitfield,/* complain_on_overflow */ 110 bfd_elf_generic_reloc, /* special_function */ 111 "R_ARM_ABS32", /* name */ 112 FALSE, /* partial_inplace */ 113 0xffffffff, /* src_mask */ 114 0xffffffff, /* dst_mask */ 115 FALSE), /* pcrel_offset */ 116 117 /* standard 32bit pc-relative reloc */ 118 HOWTO (R_ARM_REL32, /* type */ 119 0, /* rightshift */ 120 2, /* size (0 = byte, 1 = short, 2 = long) */ 121 32, /* bitsize */ 122 TRUE, /* pc_relative */ 123 0, /* bitpos */ 124 complain_overflow_bitfield,/* complain_on_overflow */ 125 bfd_elf_generic_reloc, /* special_function */ 126 "R_ARM_REL32", /* name */ 127 FALSE, /* partial_inplace */ 128 0xffffffff, /* src_mask */ 129 0xffffffff, /* dst_mask */ 130 TRUE), /* pcrel_offset */ 131 132 /* 8 bit absolute - R_ARM_LDR_PC_G0 in AAELF */ 133 HOWTO (R_ARM_PC13, /* type */ 134 0, /* rightshift */ 135 0, /* size (0 = byte, 1 = short, 2 = long) */ 136 8, /* bitsize */ 137 FALSE, /* pc_relative */ 138 0, /* bitpos */ 139 complain_overflow_bitfield,/* complain_on_overflow */ 140 bfd_elf_generic_reloc, /* special_function */ 141 "R_ARM_PC13", /* name */ 142 FALSE, /* partial_inplace */ 143 0x000000ff, /* src_mask */ 144 0x000000ff, /* dst_mask */ 145 FALSE), /* pcrel_offset */ 146 147 /* 16 bit absolute */ 148 HOWTO (R_ARM_ABS16, /* type */ 149 0, /* rightshift */ 150 1, /* size (0 = byte, 1 = short, 2 = long) */ 151 16, /* bitsize */ 152 FALSE, /* pc_relative */ 153 0, /* bitpos */ 154 complain_overflow_bitfield,/* complain_on_overflow */ 155 bfd_elf_generic_reloc, /* special_function */ 156 "R_ARM_ABS16", /* name */ 157 FALSE, /* partial_inplace */ 158 0x0000ffff, /* src_mask */ 159 0x0000ffff, /* dst_mask */ 160 FALSE), /* pcrel_offset */ 161 162 /* 12 bit absolute */ 163 HOWTO (R_ARM_ABS12, /* type */ 164 0, /* rightshift */ 165 2, /* size (0 = byte, 1 = short, 2 = long) */ 166 12, /* bitsize */ 167 FALSE, /* pc_relative */ 168 0, /* bitpos */ 169 complain_overflow_bitfield,/* complain_on_overflow */ 170 bfd_elf_generic_reloc, /* special_function */ 171 "R_ARM_ABS12", /* name */ 172 FALSE, /* partial_inplace */ 173 0x00000fff, /* src_mask */ 174 0x00000fff, /* dst_mask */ 175 FALSE), /* pcrel_offset */ 176 177 HOWTO (R_ARM_THM_ABS5, /* type */ 178 6, /* rightshift */ 179 1, /* size (0 = byte, 1 = short, 2 = long) */ 180 5, /* bitsize */ 181 FALSE, /* pc_relative */ 182 0, /* bitpos */ 183 complain_overflow_bitfield,/* complain_on_overflow */ 184 bfd_elf_generic_reloc, /* special_function */ 185 "R_ARM_THM_ABS5", /* name */ 186 FALSE, /* partial_inplace */ 187 0x000007e0, /* src_mask */ 188 0x000007e0, /* dst_mask */ 189 FALSE), /* pcrel_offset */ 190 191 /* 8 bit absolute */ 192 HOWTO (R_ARM_ABS8, /* type */ 193 0, /* rightshift */ 194 0, /* size (0 = byte, 1 = short, 2 = long) */ 195 8, /* bitsize */ 196 FALSE, /* pc_relative */ 197 0, /* bitpos */ 198 complain_overflow_bitfield,/* complain_on_overflow */ 199 bfd_elf_generic_reloc, /* special_function */ 200 "R_ARM_ABS8", /* name */ 201 FALSE, /* partial_inplace */ 202 0x000000ff, /* src_mask */ 203 0x000000ff, /* dst_mask */ 204 FALSE), /* pcrel_offset */ 205 206 HOWTO (R_ARM_SBREL32, /* type */ 207 0, /* rightshift */ 208 2, /* size (0 = byte, 1 = short, 2 = long) */ 209 32, /* bitsize */ 210 FALSE, /* pc_relative */ 211 0, /* bitpos */ 212 complain_overflow_dont,/* complain_on_overflow */ 213 bfd_elf_generic_reloc, /* special_function */ 214 "R_ARM_SBREL32", /* name */ 215 FALSE, /* partial_inplace */ 216 0xffffffff, /* src_mask */ 217 0xffffffff, /* dst_mask */ 218 FALSE), /* pcrel_offset */ 219 220 /* FIXME: Has two more bits of offset in Thumb32. */ 221 HOWTO (R_ARM_THM_CALL, /* type */ 222 1, /* rightshift */ 223 2, /* size (0 = byte, 1 = short, 2 = long) */ 224 23, /* bitsize */ 225 TRUE, /* pc_relative */ 226 0, /* bitpos */ 227 complain_overflow_signed,/* complain_on_overflow */ 228 bfd_elf_generic_reloc, /* special_function */ 229 "R_ARM_THM_CALL", /* name */ 230 FALSE, /* partial_inplace */ 231 0x07ff07ff, /* src_mask */ 232 0x07ff07ff, /* dst_mask */ 233 TRUE), /* pcrel_offset */ 234 235 HOWTO (R_ARM_THM_PC8, /* type */ 236 1, /* rightshift */ 237 1, /* size (0 = byte, 1 = short, 2 = long) */ 238 8, /* bitsize */ 239 TRUE, /* pc_relative */ 240 0, /* bitpos */ 241 complain_overflow_signed,/* complain_on_overflow */ 242 bfd_elf_generic_reloc, /* special_function */ 243 "R_ARM_THM_PC8", /* name */ 244 FALSE, /* partial_inplace */ 245 0x000000ff, /* src_mask */ 246 0x000000ff, /* dst_mask */ 247 TRUE), /* pcrel_offset */ 248 249 HOWTO (R_ARM_BREL_ADJ, /* type */ 250 1, /* rightshift */ 251 1, /* size (0 = byte, 1 = short, 2 = long) */ 252 32, /* bitsize */ 253 FALSE, /* pc_relative */ 254 0, /* bitpos */ 255 complain_overflow_signed,/* complain_on_overflow */ 256 bfd_elf_generic_reloc, /* special_function */ 257 "R_ARM_BREL_ADJ", /* name */ 258 FALSE, /* partial_inplace */ 259 0xffffffff, /* src_mask */ 260 0xffffffff, /* dst_mask */ 261 FALSE), /* pcrel_offset */ 262 263 HOWTO (R_ARM_SWI24, /* type */ 264 0, /* rightshift */ 265 0, /* size (0 = byte, 1 = short, 2 = long) */ 266 0, /* bitsize */ 267 FALSE, /* pc_relative */ 268 0, /* bitpos */ 269 complain_overflow_signed,/* complain_on_overflow */ 270 bfd_elf_generic_reloc, /* special_function */ 271 "R_ARM_SWI24", /* name */ 272 FALSE, /* partial_inplace */ 273 0x00000000, /* src_mask */ 274 0x00000000, /* dst_mask */ 275 FALSE), /* pcrel_offset */ 276 277 HOWTO (R_ARM_THM_SWI8, /* type */ 278 0, /* rightshift */ 279 0, /* size (0 = byte, 1 = short, 2 = long) */ 280 0, /* bitsize */ 281 FALSE, /* pc_relative */ 282 0, /* bitpos */ 283 complain_overflow_signed,/* complain_on_overflow */ 284 bfd_elf_generic_reloc, /* special_function */ 285 "R_ARM_SWI8", /* name */ 286 FALSE, /* partial_inplace */ 287 0x00000000, /* src_mask */ 288 0x00000000, /* dst_mask */ 289 FALSE), /* pcrel_offset */ 290 291 /* BLX instruction for the ARM. */ 292 HOWTO (R_ARM_XPC25, /* type */ 293 2, /* rightshift */ 294 2, /* size (0 = byte, 1 = short, 2 = long) */ 295 25, /* bitsize */ 296 TRUE, /* pc_relative */ 297 0, /* bitpos */ 298 complain_overflow_signed,/* complain_on_overflow */ 299 bfd_elf_generic_reloc, /* special_function */ 300 "R_ARM_XPC25", /* name */ 301 FALSE, /* partial_inplace */ 302 0x00ffffff, /* src_mask */ 303 0x00ffffff, /* dst_mask */ 304 TRUE), /* pcrel_offset */ 305 306 /* BLX instruction for the Thumb. */ 307 HOWTO (R_ARM_THM_XPC22, /* type */ 308 2, /* rightshift */ 309 2, /* size (0 = byte, 1 = short, 2 = long) */ 310 22, /* bitsize */ 311 TRUE, /* pc_relative */ 312 0, /* bitpos */ 313 complain_overflow_signed,/* complain_on_overflow */ 314 bfd_elf_generic_reloc, /* special_function */ 315 "R_ARM_THM_XPC22", /* name */ 316 FALSE, /* partial_inplace */ 317 0x07ff07ff, /* src_mask */ 318 0x07ff07ff, /* dst_mask */ 319 TRUE), /* pcrel_offset */ 320 321 /* Dynamic TLS relocations. */ 322 323 HOWTO (R_ARM_TLS_DTPMOD32, /* type */ 324 0, /* rightshift */ 325 2, /* size (0 = byte, 1 = short, 2 = long) */ 326 32, /* bitsize */ 327 FALSE, /* pc_relative */ 328 0, /* bitpos */ 329 complain_overflow_bitfield,/* complain_on_overflow */ 330 bfd_elf_generic_reloc, /* special_function */ 331 "R_ARM_TLS_DTPMOD32", /* name */ 332 TRUE, /* partial_inplace */ 333 0xffffffff, /* src_mask */ 334 0xffffffff, /* dst_mask */ 335 FALSE), /* pcrel_offset */ 336 337 HOWTO (R_ARM_TLS_DTPOFF32, /* type */ 338 0, /* rightshift */ 339 2, /* size (0 = byte, 1 = short, 2 = long) */ 340 32, /* bitsize */ 341 FALSE, /* pc_relative */ 342 0, /* bitpos */ 343 complain_overflow_bitfield,/* complain_on_overflow */ 344 bfd_elf_generic_reloc, /* special_function */ 345 "R_ARM_TLS_DTPOFF32", /* name */ 346 TRUE, /* partial_inplace */ 347 0xffffffff, /* src_mask */ 348 0xffffffff, /* dst_mask */ 349 FALSE), /* pcrel_offset */ 350 351 HOWTO (R_ARM_TLS_TPOFF32, /* type */ 352 0, /* rightshift */ 353 2, /* size (0 = byte, 1 = short, 2 = long) */ 354 32, /* bitsize */ 355 FALSE, /* pc_relative */ 356 0, /* bitpos */ 357 complain_overflow_bitfield,/* complain_on_overflow */ 358 bfd_elf_generic_reloc, /* special_function */ 359 "R_ARM_TLS_TPOFF32", /* name */ 360 TRUE, /* partial_inplace */ 361 0xffffffff, /* src_mask */ 362 0xffffffff, /* dst_mask */ 363 FALSE), /* pcrel_offset */ 364 365 /* Relocs used in ARM Linux */ 366 367 HOWTO (R_ARM_COPY, /* type */ 368 0, /* rightshift */ 369 2, /* size (0 = byte, 1 = short, 2 = long) */ 370 32, /* bitsize */ 371 FALSE, /* pc_relative */ 372 0, /* bitpos */ 373 complain_overflow_bitfield,/* complain_on_overflow */ 374 bfd_elf_generic_reloc, /* special_function */ 375 "R_ARM_COPY", /* name */ 376 TRUE, /* partial_inplace */ 377 0xffffffff, /* src_mask */ 378 0xffffffff, /* dst_mask */ 379 FALSE), /* pcrel_offset */ 380 381 HOWTO (R_ARM_GLOB_DAT, /* type */ 382 0, /* rightshift */ 383 2, /* size (0 = byte, 1 = short, 2 = long) */ 384 32, /* bitsize */ 385 FALSE, /* pc_relative */ 386 0, /* bitpos */ 387 complain_overflow_bitfield,/* complain_on_overflow */ 388 bfd_elf_generic_reloc, /* special_function */ 389 "R_ARM_GLOB_DAT", /* name */ 390 TRUE, /* partial_inplace */ 391 0xffffffff, /* src_mask */ 392 0xffffffff, /* dst_mask */ 393 FALSE), /* pcrel_offset */ 394 395 HOWTO (R_ARM_JUMP_SLOT, /* type */ 396 0, /* rightshift */ 397 2, /* size (0 = byte, 1 = short, 2 = long) */ 398 32, /* bitsize */ 399 FALSE, /* pc_relative */ 400 0, /* bitpos */ 401 complain_overflow_bitfield,/* complain_on_overflow */ 402 bfd_elf_generic_reloc, /* special_function */ 403 "R_ARM_JUMP_SLOT", /* name */ 404 TRUE, /* partial_inplace */ 405 0xffffffff, /* src_mask */ 406 0xffffffff, /* dst_mask */ 407 FALSE), /* pcrel_offset */ 408 409 HOWTO (R_ARM_RELATIVE, /* type */ 410 0, /* rightshift */ 411 2, /* size (0 = byte, 1 = short, 2 = long) */ 412 32, /* bitsize */ 413 FALSE, /* pc_relative */ 414 0, /* bitpos */ 415 complain_overflow_bitfield,/* complain_on_overflow */ 416 bfd_elf_generic_reloc, /* special_function */ 417 "R_ARM_RELATIVE", /* name */ 418 TRUE, /* partial_inplace */ 419 0xffffffff, /* src_mask */ 420 0xffffffff, /* dst_mask */ 421 FALSE), /* pcrel_offset */ 422 423 HOWTO (R_ARM_GOTOFF32, /* type */ 424 0, /* rightshift */ 425 2, /* size (0 = byte, 1 = short, 2 = long) */ 426 32, /* bitsize */ 427 FALSE, /* pc_relative */ 428 0, /* bitpos */ 429 complain_overflow_bitfield,/* complain_on_overflow */ 430 bfd_elf_generic_reloc, /* special_function */ 431 "R_ARM_GOTOFF32", /* name */ 432 TRUE, /* partial_inplace */ 433 0xffffffff, /* src_mask */ 434 0xffffffff, /* dst_mask */ 435 FALSE), /* pcrel_offset */ 436 437 HOWTO (R_ARM_GOTPC, /* type */ 438 0, /* rightshift */ 439 2, /* size (0 = byte, 1 = short, 2 = long) */ 440 32, /* bitsize */ 441 TRUE, /* pc_relative */ 442 0, /* bitpos */ 443 complain_overflow_bitfield,/* complain_on_overflow */ 444 bfd_elf_generic_reloc, /* special_function */ 445 "R_ARM_GOTPC", /* name */ 446 TRUE, /* partial_inplace */ 447 0xffffffff, /* src_mask */ 448 0xffffffff, /* dst_mask */ 449 TRUE), /* pcrel_offset */ 450 451 HOWTO (R_ARM_GOT32, /* type */ 452 0, /* rightshift */ 453 2, /* size (0 = byte, 1 = short, 2 = long) */ 454 32, /* bitsize */ 455 FALSE, /* pc_relative */ 456 0, /* bitpos */ 457 complain_overflow_bitfield,/* complain_on_overflow */ 458 bfd_elf_generic_reloc, /* special_function */ 459 "R_ARM_GOT32", /* name */ 460 TRUE, /* partial_inplace */ 461 0xffffffff, /* src_mask */ 462 0xffffffff, /* dst_mask */ 463 FALSE), /* pcrel_offset */ 464 465 HOWTO (R_ARM_PLT32, /* type */ 466 2, /* rightshift */ 467 2, /* size (0 = byte, 1 = short, 2 = long) */ 468 24, /* bitsize */ 469 TRUE, /* pc_relative */ 470 0, /* bitpos */ 471 complain_overflow_bitfield,/* complain_on_overflow */ 472 bfd_elf_generic_reloc, /* special_function */ 473 "R_ARM_PLT32", /* name */ 474 FALSE, /* partial_inplace */ 475 0x00ffffff, /* src_mask */ 476 0x00ffffff, /* dst_mask */ 477 TRUE), /* pcrel_offset */ 478 479 HOWTO (R_ARM_CALL, /* type */ 480 2, /* rightshift */ 481 2, /* size (0 = byte, 1 = short, 2 = long) */ 482 24, /* bitsize */ 483 TRUE, /* pc_relative */ 484 0, /* bitpos */ 485 complain_overflow_signed,/* complain_on_overflow */ 486 bfd_elf_generic_reloc, /* special_function */ 487 "R_ARM_CALL", /* name */ 488 FALSE, /* partial_inplace */ 489 0x00ffffff, /* src_mask */ 490 0x00ffffff, /* dst_mask */ 491 TRUE), /* pcrel_offset */ 492 493 HOWTO (R_ARM_JUMP24, /* type */ 494 2, /* rightshift */ 495 2, /* size (0 = byte, 1 = short, 2 = long) */ 496 24, /* bitsize */ 497 TRUE, /* pc_relative */ 498 0, /* bitpos */ 499 complain_overflow_signed,/* complain_on_overflow */ 500 bfd_elf_generic_reloc, /* special_function */ 501 "R_ARM_JUMP24", /* name */ 502 FALSE, /* partial_inplace */ 503 0x00ffffff, /* src_mask */ 504 0x00ffffff, /* dst_mask */ 505 TRUE), /* pcrel_offset */ 506 507 HOWTO (R_ARM_THM_JUMP24, /* type */ 508 1, /* rightshift */ 509 2, /* size (0 = byte, 1 = short, 2 = long) */ 510 24, /* bitsize */ 511 TRUE, /* pc_relative */ 512 0, /* bitpos */ 513 complain_overflow_signed,/* complain_on_overflow */ 514 bfd_elf_generic_reloc, /* special_function */ 515 "R_ARM_THM_JUMP24", /* name */ 516 FALSE, /* partial_inplace */ 517 0x07ff2fff, /* src_mask */ 518 0x07ff2fff, /* dst_mask */ 519 TRUE), /* pcrel_offset */ 520 521 HOWTO (R_ARM_BASE_ABS, /* type */ 522 0, /* rightshift */ 523 2, /* size (0 = byte, 1 = short, 2 = long) */ 524 32, /* bitsize */ 525 FALSE, /* pc_relative */ 526 0, /* bitpos */ 527 complain_overflow_dont,/* complain_on_overflow */ 528 bfd_elf_generic_reloc, /* special_function */ 529 "R_ARM_BASE_ABS", /* name */ 530 FALSE, /* partial_inplace */ 531 0xffffffff, /* src_mask */ 532 0xffffffff, /* dst_mask */ 533 FALSE), /* pcrel_offset */ 534 535 HOWTO (R_ARM_ALU_PCREL7_0, /* type */ 536 0, /* rightshift */ 537 2, /* size (0 = byte, 1 = short, 2 = long) */ 538 12, /* bitsize */ 539 TRUE, /* pc_relative */ 540 0, /* bitpos */ 541 complain_overflow_dont,/* complain_on_overflow */ 542 bfd_elf_generic_reloc, /* special_function */ 543 "R_ARM_ALU_PCREL_7_0", /* name */ 544 FALSE, /* partial_inplace */ 545 0x00000fff, /* src_mask */ 546 0x00000fff, /* dst_mask */ 547 TRUE), /* pcrel_offset */ 548 549 HOWTO (R_ARM_ALU_PCREL15_8, /* type */ 550 0, /* rightshift */ 551 2, /* size (0 = byte, 1 = short, 2 = long) */ 552 12, /* bitsize */ 553 TRUE, /* pc_relative */ 554 8, /* bitpos */ 555 complain_overflow_dont,/* complain_on_overflow */ 556 bfd_elf_generic_reloc, /* special_function */ 557 "R_ARM_ALU_PCREL_15_8",/* name */ 558 FALSE, /* partial_inplace */ 559 0x00000fff, /* src_mask */ 560 0x00000fff, /* dst_mask */ 561 TRUE), /* pcrel_offset */ 562 563 HOWTO (R_ARM_ALU_PCREL23_15, /* type */ 564 0, /* rightshift */ 565 2, /* size (0 = byte, 1 = short, 2 = long) */ 566 12, /* bitsize */ 567 TRUE, /* pc_relative */ 568 16, /* bitpos */ 569 complain_overflow_dont,/* complain_on_overflow */ 570 bfd_elf_generic_reloc, /* special_function */ 571 "R_ARM_ALU_PCREL_23_15",/* name */ 572 FALSE, /* partial_inplace */ 573 0x00000fff, /* src_mask */ 574 0x00000fff, /* dst_mask */ 575 TRUE), /* pcrel_offset */ 576 577 HOWTO (R_ARM_LDR_SBREL_11_0, /* type */ 578 0, /* rightshift */ 579 2, /* size (0 = byte, 1 = short, 2 = long) */ 580 12, /* bitsize */ 581 FALSE, /* pc_relative */ 582 0, /* bitpos */ 583 complain_overflow_dont,/* complain_on_overflow */ 584 bfd_elf_generic_reloc, /* special_function */ 585 "R_ARM_LDR_SBREL_11_0",/* name */ 586 FALSE, /* partial_inplace */ 587 0x00000fff, /* src_mask */ 588 0x00000fff, /* dst_mask */ 589 FALSE), /* pcrel_offset */ 590 591 HOWTO (R_ARM_ALU_SBREL_19_12, /* type */ 592 0, /* rightshift */ 593 2, /* size (0 = byte, 1 = short, 2 = long) */ 594 8, /* bitsize */ 595 FALSE, /* pc_relative */ 596 12, /* bitpos */ 597 complain_overflow_dont,/* complain_on_overflow */ 598 bfd_elf_generic_reloc, /* special_function */ 599 "R_ARM_ALU_SBREL_19_12",/* name */ 600 FALSE, /* partial_inplace */ 601 0x000ff000, /* src_mask */ 602 0x000ff000, /* dst_mask */ 603 FALSE), /* pcrel_offset */ 604 605 HOWTO (R_ARM_ALU_SBREL_27_20, /* type */ 606 0, /* rightshift */ 607 2, /* size (0 = byte, 1 = short, 2 = long) */ 608 8, /* bitsize */ 609 FALSE, /* pc_relative */ 610 20, /* bitpos */ 611 complain_overflow_dont,/* complain_on_overflow */ 612 bfd_elf_generic_reloc, /* special_function */ 613 "R_ARM_ALU_SBREL_27_20",/* name */ 614 FALSE, /* partial_inplace */ 615 0x0ff00000, /* src_mask */ 616 0x0ff00000, /* dst_mask */ 617 FALSE), /* pcrel_offset */ 618 619 HOWTO (R_ARM_TARGET1, /* type */ 620 0, /* rightshift */ 621 2, /* size (0 = byte, 1 = short, 2 = long) */ 622 32, /* bitsize */ 623 FALSE, /* pc_relative */ 624 0, /* bitpos */ 625 complain_overflow_dont,/* complain_on_overflow */ 626 bfd_elf_generic_reloc, /* special_function */ 627 "R_ARM_TARGET1", /* name */ 628 FALSE, /* partial_inplace */ 629 0xffffffff, /* src_mask */ 630 0xffffffff, /* dst_mask */ 631 FALSE), /* pcrel_offset */ 632 633 HOWTO (R_ARM_ROSEGREL32, /* type */ 634 0, /* rightshift */ 635 2, /* size (0 = byte, 1 = short, 2 = long) */ 636 32, /* bitsize */ 637 FALSE, /* pc_relative */ 638 0, /* bitpos */ 639 complain_overflow_dont,/* complain_on_overflow */ 640 bfd_elf_generic_reloc, /* special_function */ 641 "R_ARM_ROSEGREL32", /* name */ 642 FALSE, /* partial_inplace */ 643 0xffffffff, /* src_mask */ 644 0xffffffff, /* dst_mask */ 645 FALSE), /* pcrel_offset */ 646 647 HOWTO (R_ARM_V4BX, /* type */ 648 0, /* rightshift */ 649 2, /* size (0 = byte, 1 = short, 2 = long) */ 650 32, /* bitsize */ 651 FALSE, /* pc_relative */ 652 0, /* bitpos */ 653 complain_overflow_dont,/* complain_on_overflow */ 654 bfd_elf_generic_reloc, /* special_function */ 655 "R_ARM_V4BX", /* name */ 656 FALSE, /* partial_inplace */ 657 0xffffffff, /* src_mask */ 658 0xffffffff, /* dst_mask */ 659 FALSE), /* pcrel_offset */ 660 661 HOWTO (R_ARM_TARGET2, /* type */ 662 0, /* rightshift */ 663 2, /* size (0 = byte, 1 = short, 2 = long) */ 664 32, /* bitsize */ 665 FALSE, /* pc_relative */ 666 0, /* bitpos */ 667 complain_overflow_signed,/* complain_on_overflow */ 668 bfd_elf_generic_reloc, /* special_function */ 669 "R_ARM_TARGET2", /* name */ 670 FALSE, /* partial_inplace */ 671 0xffffffff, /* src_mask */ 672 0xffffffff, /* dst_mask */ 673 TRUE), /* pcrel_offset */ 674 675 HOWTO (R_ARM_PREL31, /* type */ 676 0, /* rightshift */ 677 2, /* size (0 = byte, 1 = short, 2 = long) */ 678 31, /* bitsize */ 679 TRUE, /* pc_relative */ 680 0, /* bitpos */ 681 complain_overflow_signed,/* complain_on_overflow */ 682 bfd_elf_generic_reloc, /* special_function */ 683 "R_ARM_PREL31", /* name */ 684 FALSE, /* partial_inplace */ 685 0x7fffffff, /* src_mask */ 686 0x7fffffff, /* dst_mask */ 687 TRUE), /* pcrel_offset */ 688 689 HOWTO (R_ARM_MOVW_ABS_NC, /* type */ 690 0, /* rightshift */ 691 2, /* size (0 = byte, 1 = short, 2 = long) */ 692 16, /* bitsize */ 693 FALSE, /* pc_relative */ 694 0, /* bitpos */ 695 complain_overflow_dont,/* complain_on_overflow */ 696 bfd_elf_generic_reloc, /* special_function */ 697 "R_ARM_MOVW_ABS_NC", /* name */ 698 FALSE, /* partial_inplace */ 699 0x0000ffff, /* src_mask */ 700 0x0000ffff, /* dst_mask */ 701 FALSE), /* pcrel_offset */ 702 703 HOWTO (R_ARM_MOVT_ABS, /* type */ 704 0, /* rightshift */ 705 2, /* size (0 = byte, 1 = short, 2 = long) */ 706 16, /* bitsize */ 707 FALSE, /* pc_relative */ 708 0, /* bitpos */ 709 complain_overflow_bitfield,/* complain_on_overflow */ 710 bfd_elf_generic_reloc, /* special_function */ 711 "R_ARM_MOVT_ABS", /* name */ 712 FALSE, /* partial_inplace */ 713 0x0000ffff, /* src_mask */ 714 0x0000ffff, /* dst_mask */ 715 FALSE), /* pcrel_offset */ 716 717 HOWTO (R_ARM_MOVW_PREL_NC, /* type */ 718 0, /* rightshift */ 719 2, /* size (0 = byte, 1 = short, 2 = long) */ 720 16, /* bitsize */ 721 TRUE, /* pc_relative */ 722 0, /* bitpos */ 723 complain_overflow_dont,/* complain_on_overflow */ 724 bfd_elf_generic_reloc, /* special_function */ 725 "R_ARM_MOVW_PREL_NC", /* name */ 726 FALSE, /* partial_inplace */ 727 0x0000ffff, /* src_mask */ 728 0x0000ffff, /* dst_mask */ 729 TRUE), /* pcrel_offset */ 730 731 HOWTO (R_ARM_MOVT_PREL, /* type */ 732 0, /* rightshift */ 733 2, /* size (0 = byte, 1 = short, 2 = long) */ 734 16, /* bitsize */ 735 TRUE, /* pc_relative */ 736 0, /* bitpos */ 737 complain_overflow_bitfield,/* complain_on_overflow */ 738 bfd_elf_generic_reloc, /* special_function */ 739 "R_ARM_MOVT_PREL", /* name */ 740 FALSE, /* partial_inplace */ 741 0x0000ffff, /* src_mask */ 742 0x0000ffff, /* dst_mask */ 743 TRUE), /* pcrel_offset */ 744 745 HOWTO (R_ARM_THM_MOVW_ABS_NC, /* type */ 746 0, /* rightshift */ 747 2, /* size (0 = byte, 1 = short, 2 = long) */ 748 16, /* bitsize */ 749 FALSE, /* pc_relative */ 750 0, /* bitpos */ 751 complain_overflow_dont,/* complain_on_overflow */ 752 bfd_elf_generic_reloc, /* special_function */ 753 "R_ARM_THM_MOVW_ABS_NC",/* name */ 754 FALSE, /* partial_inplace */ 755 0x040f70ff, /* src_mask */ 756 0x040f70ff, /* dst_mask */ 757 FALSE), /* pcrel_offset */ 758 759 HOWTO (R_ARM_THM_MOVT_ABS, /* type */ 760 0, /* rightshift */ 761 2, /* size (0 = byte, 1 = short, 2 = long) */ 762 16, /* bitsize */ 763 FALSE, /* pc_relative */ 764 0, /* bitpos */ 765 complain_overflow_bitfield,/* complain_on_overflow */ 766 bfd_elf_generic_reloc, /* special_function */ 767 "R_ARM_THM_MOVT_ABS", /* name */ 768 FALSE, /* partial_inplace */ 769 0x040f70ff, /* src_mask */ 770 0x040f70ff, /* dst_mask */ 771 FALSE), /* pcrel_offset */ 772 773 HOWTO (R_ARM_THM_MOVW_PREL_NC,/* type */ 774 0, /* rightshift */ 775 2, /* size (0 = byte, 1 = short, 2 = long) */ 776 16, /* bitsize */ 777 TRUE, /* pc_relative */ 778 0, /* bitpos */ 779 complain_overflow_dont,/* complain_on_overflow */ 780 bfd_elf_generic_reloc, /* special_function */ 781 "R_ARM_THM_MOVW_PREL_NC",/* name */ 782 FALSE, /* partial_inplace */ 783 0x040f70ff, /* src_mask */ 784 0x040f70ff, /* dst_mask */ 785 TRUE), /* pcrel_offset */ 786 787 HOWTO (R_ARM_THM_MOVT_PREL, /* type */ 788 0, /* rightshift */ 789 2, /* size (0 = byte, 1 = short, 2 = long) */ 790 16, /* bitsize */ 791 TRUE, /* pc_relative */ 792 0, /* bitpos */ 793 complain_overflow_bitfield,/* complain_on_overflow */ 794 bfd_elf_generic_reloc, /* special_function */ 795 "R_ARM_THM_MOVT_PREL", /* name */ 796 FALSE, /* partial_inplace */ 797 0x040f70ff, /* src_mask */ 798 0x040f70ff, /* dst_mask */ 799 TRUE), /* pcrel_offset */ 800 801 HOWTO (R_ARM_THM_JUMP19, /* type */ 802 1, /* rightshift */ 803 2, /* size (0 = byte, 1 = short, 2 = long) */ 804 19, /* bitsize */ 805 TRUE, /* pc_relative */ 806 0, /* bitpos */ 807 complain_overflow_signed,/* complain_on_overflow */ 808 bfd_elf_generic_reloc, /* special_function */ 809 "R_ARM_THM_JUMP19", /* name */ 810 FALSE, /* partial_inplace */ 811 0x043f2fff, /* src_mask */ 812 0x043f2fff, /* dst_mask */ 813 TRUE), /* pcrel_offset */ 814 815 HOWTO (R_ARM_THM_JUMP6, /* type */ 816 1, /* rightshift */ 817 1, /* size (0 = byte, 1 = short, 2 = long) */ 818 6, /* bitsize */ 819 TRUE, /* pc_relative */ 820 0, /* bitpos */ 821 complain_overflow_unsigned,/* complain_on_overflow */ 822 bfd_elf_generic_reloc, /* special_function */ 823 "R_ARM_THM_JUMP6", /* name */ 824 FALSE, /* partial_inplace */ 825 0x02f8, /* src_mask */ 826 0x02f8, /* dst_mask */ 827 TRUE), /* pcrel_offset */ 828 829 /* These are declared as 13-bit signed relocations because we can 830 address -4095 .. 4095(base) by altering ADDW to SUBW or vice 831 versa. */ 832 HOWTO (R_ARM_THM_ALU_PREL_11_0,/* type */ 833 0, /* rightshift */ 834 2, /* size (0 = byte, 1 = short, 2 = long) */ 835 13, /* bitsize */ 836 TRUE, /* pc_relative */ 837 0, /* bitpos */ 838 complain_overflow_signed,/* complain_on_overflow */ 839 bfd_elf_generic_reloc, /* special_function */ 840 "R_ARM_THM_ALU_PREL_11_0",/* name */ 841 FALSE, /* partial_inplace */ 842 0x040070ff, /* src_mask */ 843 0x040070ff, /* dst_mask */ 844 TRUE), /* pcrel_offset */ 845 846 HOWTO (R_ARM_THM_PC12, /* type */ 847 0, /* rightshift */ 848 2, /* size (0 = byte, 1 = short, 2 = long) */ 849 13, /* bitsize */ 850 TRUE, /* pc_relative */ 851 0, /* bitpos */ 852 complain_overflow_signed,/* complain_on_overflow */ 853 bfd_elf_generic_reloc, /* special_function */ 854 "R_ARM_THM_PC12", /* name */ 855 FALSE, /* partial_inplace */ 856 0x040070ff, /* src_mask */ 857 0x040070ff, /* dst_mask */ 858 TRUE), /* pcrel_offset */ 859 860 HOWTO (R_ARM_ABS32_NOI, /* type */ 861 0, /* rightshift */ 862 2, /* size (0 = byte, 1 = short, 2 = long) */ 863 32, /* bitsize */ 864 FALSE, /* pc_relative */ 865 0, /* bitpos */ 866 complain_overflow_dont,/* complain_on_overflow */ 867 bfd_elf_generic_reloc, /* special_function */ 868 "R_ARM_ABS32_NOI", /* name */ 869 FALSE, /* partial_inplace */ 870 0xffffffff, /* src_mask */ 871 0xffffffff, /* dst_mask */ 872 FALSE), /* pcrel_offset */ 873 874 HOWTO (R_ARM_REL32_NOI, /* type */ 875 0, /* rightshift */ 876 2, /* size (0 = byte, 1 = short, 2 = long) */ 877 32, /* bitsize */ 878 TRUE, /* pc_relative */ 879 0, /* bitpos */ 880 complain_overflow_dont,/* complain_on_overflow */ 881 bfd_elf_generic_reloc, /* special_function */ 882 "R_ARM_REL32_NOI", /* name */ 883 FALSE, /* partial_inplace */ 884 0xffffffff, /* src_mask */ 885 0xffffffff, /* dst_mask */ 886 FALSE), /* pcrel_offset */ 887}; 888 889/* Relocations 57 .. 83 are the "group relocations" which we do not 890 support. */ 891 892static reloc_howto_type elf32_arm_howto_table_2[] = 893{ 894 HOWTO (R_ARM_MOVW_BREL_NC, /* type */ 895 0, /* rightshift */ 896 2, /* size (0 = byte, 1 = short, 2 = long) */ 897 16, /* bitsize */ 898 FALSE, /* pc_relative */ 899 0, /* bitpos */ 900 complain_overflow_dont,/* complain_on_overflow */ 901 bfd_elf_generic_reloc, /* special_function */ 902 "R_ARM_MOVW_BREL_NC", /* name */ 903 FALSE, /* partial_inplace */ 904 0x0000ffff, /* src_mask */ 905 0x0000ffff, /* dst_mask */ 906 FALSE), /* pcrel_offset */ 907 908 HOWTO (R_ARM_MOVT_BREL, /* type */ 909 0, /* rightshift */ 910 2, /* size (0 = byte, 1 = short, 2 = long) */ 911 16, /* bitsize */ 912 FALSE, /* pc_relative */ 913 0, /* bitpos */ 914 complain_overflow_bitfield,/* complain_on_overflow */ 915 bfd_elf_generic_reloc, /* special_function */ 916 "R_ARM_MOVT_BREL", /* name */ 917 FALSE, /* partial_inplace */ 918 0x0000ffff, /* src_mask */ 919 0x0000ffff, /* dst_mask */ 920 FALSE), /* pcrel_offset */ 921 922 HOWTO (R_ARM_MOVW_BREL, /* type */ 923 0, /* rightshift */ 924 2, /* size (0 = byte, 1 = short, 2 = long) */ 925 16, /* bitsize */ 926 FALSE, /* pc_relative */ 927 0, /* bitpos */ 928 complain_overflow_dont,/* complain_on_overflow */ 929 bfd_elf_generic_reloc, /* special_function */ 930 "R_ARM_MOVW_BREL", /* name */ 931 FALSE, /* partial_inplace */ 932 0x0000ffff, /* src_mask */ 933 0x0000ffff, /* dst_mask */ 934 FALSE), /* pcrel_offset */ 935 936 HOWTO (R_ARM_THM_MOVW_BREL_NC,/* type */ 937 0, /* rightshift */ 938 2, /* size (0 = byte, 1 = short, 2 = long) */ 939 16, /* bitsize */ 940 FALSE, /* pc_relative */ 941 0, /* bitpos */ 942 complain_overflow_dont,/* complain_on_overflow */ 943 bfd_elf_generic_reloc, /* special_function */ 944 "R_ARM_THM_MOVW_BREL_NC",/* name */ 945 FALSE, /* partial_inplace */ 946 0x040f70ff, /* src_mask */ 947 0x040f70ff, /* dst_mask */ 948 FALSE), /* pcrel_offset */ 949 950 HOWTO (R_ARM_THM_MOVT_BREL, /* type */ 951 0, /* rightshift */ 952 2, /* size (0 = byte, 1 = short, 2 = long) */ 953 16, /* bitsize */ 954 FALSE, /* pc_relative */ 955 0, /* bitpos */ 956 complain_overflow_bitfield,/* complain_on_overflow */ 957 bfd_elf_generic_reloc, /* special_function */ 958 "R_ARM_THM_MOVT_BREL", /* name */ 959 FALSE, /* partial_inplace */ 960 0x040f70ff, /* src_mask */ 961 0x040f70ff, /* dst_mask */ 962 FALSE), /* pcrel_offset */ 963 964 HOWTO (R_ARM_THM_MOVW_BREL, /* type */ 965 0, /* rightshift */ 966 2, /* size (0 = byte, 1 = short, 2 = long) */ 967 16, /* bitsize */ 968 FALSE, /* pc_relative */ 969 0, /* bitpos */ 970 complain_overflow_dont,/* complain_on_overflow */ 971 bfd_elf_generic_reloc, /* special_function */ 972 "R_ARM_THM_MOVW_BREL", /* name */ 973 FALSE, /* partial_inplace */ 974 0x040f70ff, /* src_mask */ 975 0x040f70ff, /* dst_mask */ 976 FALSE), /* pcrel_offset */ 977 978 EMPTY_HOWTO (90), /* unallocated */ 979 EMPTY_HOWTO (91), 980 EMPTY_HOWTO (92), 981 EMPTY_HOWTO (93), 982 983 HOWTO (R_ARM_PLT32_ABS, /* type */ 984 0, /* rightshift */ 985 2, /* size (0 = byte, 1 = short, 2 = long) */ 986 32, /* bitsize */ 987 FALSE, /* pc_relative */ 988 0, /* bitpos */ 989 complain_overflow_dont,/* complain_on_overflow */ 990 bfd_elf_generic_reloc, /* special_function */ 991 "R_ARM_PLT32_ABS", /* name */ 992 FALSE, /* partial_inplace */ 993 0xffffffff, /* src_mask */ 994 0xffffffff, /* dst_mask */ 995 FALSE), /* pcrel_offset */ 996 997 HOWTO (R_ARM_GOT_ABS, /* type */ 998 0, /* rightshift */ 999 2, /* size (0 = byte, 1 = short, 2 = long) */ 1000 32, /* bitsize */ 1001 FALSE, /* pc_relative */ 1002 0, /* bitpos */ 1003 complain_overflow_dont,/* complain_on_overflow */ 1004 bfd_elf_generic_reloc, /* special_function */ 1005 "R_ARM_GOT_ABS", /* name */ 1006 FALSE, /* partial_inplace */ 1007 0xffffffff, /* src_mask */ 1008 0xffffffff, /* dst_mask */ 1009 FALSE), /* pcrel_offset */ 1010 1011 HOWTO (R_ARM_GOT_PREL, /* type */ 1012 0, /* rightshift */ 1013 2, /* size (0 = byte, 1 = short, 2 = long) */ 1014 32, /* bitsize */ 1015 TRUE, /* pc_relative */ 1016 0, /* bitpos */ 1017 complain_overflow_dont, /* complain_on_overflow */ 1018 bfd_elf_generic_reloc, /* special_function */ 1019 "R_ARM_GOT_PREL", /* name */ 1020 FALSE, /* partial_inplace */ 1021 0xffffffff, /* src_mask */ 1022 0xffffffff, /* dst_mask */ 1023 TRUE), /* pcrel_offset */ 1024 1025 HOWTO (R_ARM_GOT_BREL12, /* type */ 1026 0, /* rightshift */ 1027 2, /* size (0 = byte, 1 = short, 2 = long) */ 1028 12, /* bitsize */ 1029 FALSE, /* pc_relative */ 1030 0, /* bitpos */ 1031 complain_overflow_bitfield,/* complain_on_overflow */ 1032 bfd_elf_generic_reloc, /* special_function */ 1033 "R_ARM_GOT_BREL12", /* name */ 1034 FALSE, /* partial_inplace */ 1035 0x00000fff, /* src_mask */ 1036 0x00000fff, /* dst_mask */ 1037 FALSE), /* pcrel_offset */ 1038 1039 HOWTO (R_ARM_GOTOFF12, /* type */ 1040 0, /* rightshift */ 1041 2, /* size (0 = byte, 1 = short, 2 = long) */ 1042 12, /* bitsize */ 1043 FALSE, /* pc_relative */ 1044 0, /* bitpos */ 1045 complain_overflow_bitfield,/* complain_on_overflow */ 1046 bfd_elf_generic_reloc, /* special_function */ 1047 "R_ARM_GOTOFF12", /* name */ 1048 FALSE, /* partial_inplace */ 1049 0x00000fff, /* src_mask */ 1050 0x00000fff, /* dst_mask */ 1051 FALSE), /* pcrel_offset */ 1052 1053 EMPTY_HOWTO (R_ARM_GOTRELAX), /* reserved for future GOT-load optimizations */ 1054 1055 /* GNU extension to record C++ vtable member usage */ 1056 HOWTO (R_ARM_GNU_VTENTRY, /* type */ 1057 0, /* rightshift */ 1058 2, /* size (0 = byte, 1 = short, 2 = long) */ 1059 0, /* bitsize */ 1060 FALSE, /* pc_relative */ 1061 0, /* bitpos */ 1062 complain_overflow_dont, /* complain_on_overflow */ 1063 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 1064 "R_ARM_GNU_VTENTRY", /* name */ 1065 FALSE, /* partial_inplace */ 1066 0, /* src_mask */ 1067 0, /* dst_mask */ 1068 FALSE), /* pcrel_offset */ 1069 1070 /* GNU extension to record C++ vtable hierarchy */ 1071 HOWTO (R_ARM_GNU_VTINHERIT, /* type */ 1072 0, /* rightshift */ 1073 2, /* size (0 = byte, 1 = short, 2 = long) */ 1074 0, /* bitsize */ 1075 FALSE, /* pc_relative */ 1076 0, /* bitpos */ 1077 complain_overflow_dont, /* complain_on_overflow */ 1078 NULL, /* special_function */ 1079 "R_ARM_GNU_VTINHERIT", /* name */ 1080 FALSE, /* partial_inplace */ 1081 0, /* src_mask */ 1082 0, /* dst_mask */ 1083 FALSE), /* pcrel_offset */ 1084 1085 HOWTO (R_ARM_THM_JUMP11, /* type */ 1086 1, /* rightshift */ 1087 1, /* size (0 = byte, 1 = short, 2 = long) */ 1088 11, /* bitsize */ 1089 TRUE, /* pc_relative */ 1090 0, /* bitpos */ 1091 complain_overflow_signed, /* complain_on_overflow */ 1092 bfd_elf_generic_reloc, /* special_function */ 1093 "R_ARM_THM_JUMP11", /* name */ 1094 FALSE, /* partial_inplace */ 1095 0x000007ff, /* src_mask */ 1096 0x000007ff, /* dst_mask */ 1097 TRUE), /* pcrel_offset */ 1098 1099 HOWTO (R_ARM_THM_JUMP8, /* type */ 1100 1, /* rightshift */ 1101 1, /* size (0 = byte, 1 = short, 2 = long) */ 1102 8, /* bitsize */ 1103 TRUE, /* pc_relative */ 1104 0, /* bitpos */ 1105 complain_overflow_signed, /* complain_on_overflow */ 1106 bfd_elf_generic_reloc, /* special_function */ 1107 "R_ARM_THM_JUMP8", /* name */ 1108 FALSE, /* partial_inplace */ 1109 0x000000ff, /* src_mask */ 1110 0x000000ff, /* dst_mask */ 1111 TRUE), /* pcrel_offset */ 1112 1113 /* TLS relocations */ 1114 HOWTO (R_ARM_TLS_GD32, /* type */ 1115 0, /* rightshift */ 1116 2, /* size (0 = byte, 1 = short, 2 = long) */ 1117 32, /* bitsize */ 1118 FALSE, /* pc_relative */ 1119 0, /* bitpos */ 1120 complain_overflow_bitfield,/* complain_on_overflow */ 1121 NULL, /* special_function */ 1122 "R_ARM_TLS_GD32", /* name */ 1123 TRUE, /* partial_inplace */ 1124 0xffffffff, /* src_mask */ 1125 0xffffffff, /* dst_mask */ 1126 FALSE), /* pcrel_offset */ 1127 1128 HOWTO (R_ARM_TLS_LDM32, /* type */ 1129 0, /* rightshift */ 1130 2, /* size (0 = byte, 1 = short, 2 = long) */ 1131 32, /* bitsize */ 1132 FALSE, /* pc_relative */ 1133 0, /* bitpos */ 1134 complain_overflow_bitfield,/* complain_on_overflow */ 1135 bfd_elf_generic_reloc, /* special_function */ 1136 "R_ARM_TLS_LDM32", /* name */ 1137 TRUE, /* partial_inplace */ 1138 0xffffffff, /* src_mask */ 1139 0xffffffff, /* dst_mask */ 1140 FALSE), /* pcrel_offset */ 1141 1142 HOWTO (R_ARM_TLS_LDO32, /* type */ 1143 0, /* rightshift */ 1144 2, /* size (0 = byte, 1 = short, 2 = long) */ 1145 32, /* bitsize */ 1146 FALSE, /* pc_relative */ 1147 0, /* bitpos */ 1148 complain_overflow_bitfield,/* complain_on_overflow */ 1149 bfd_elf_generic_reloc, /* special_function */ 1150 "R_ARM_TLS_LDO32", /* name */ 1151 TRUE, /* partial_inplace */ 1152 0xffffffff, /* src_mask */ 1153 0xffffffff, /* dst_mask */ 1154 FALSE), /* pcrel_offset */ 1155 1156 HOWTO (R_ARM_TLS_IE32, /* type */ 1157 0, /* rightshift */ 1158 2, /* size (0 = byte, 1 = short, 2 = long) */ 1159 32, /* bitsize */ 1160 FALSE, /* pc_relative */ 1161 0, /* bitpos */ 1162 complain_overflow_bitfield,/* complain_on_overflow */ 1163 NULL, /* special_function */ 1164 "R_ARM_TLS_IE32", /* name */ 1165 TRUE, /* partial_inplace */ 1166 0xffffffff, /* src_mask */ 1167 0xffffffff, /* dst_mask */ 1168 FALSE), /* pcrel_offset */ 1169 1170 HOWTO (R_ARM_TLS_LE32, /* type */ 1171 0, /* rightshift */ 1172 2, /* size (0 = byte, 1 = short, 2 = long) */ 1173 32, /* bitsize */ 1174 FALSE, /* pc_relative */ 1175 0, /* bitpos */ 1176 complain_overflow_bitfield,/* complain_on_overflow */ 1177 bfd_elf_generic_reloc, /* special_function */ 1178 "R_ARM_TLS_LE32", /* name */ 1179 TRUE, /* partial_inplace */ 1180 0xffffffff, /* src_mask */ 1181 0xffffffff, /* dst_mask */ 1182 FALSE), /* pcrel_offset */ 1183 1184 HOWTO (R_ARM_TLS_LDO12, /* type */ 1185 0, /* rightshift */ 1186 2, /* size (0 = byte, 1 = short, 2 = long) */ 1187 12, /* bitsize */ 1188 FALSE, /* pc_relative */ 1189 0, /* bitpos */ 1190 complain_overflow_bitfield,/* complain_on_overflow */ 1191 bfd_elf_generic_reloc, /* special_function */ 1192 "R_ARM_TLS_LDO12", /* name */ 1193 FALSE, /* partial_inplace */ 1194 0x00000fff, /* src_mask */ 1195 0x00000fff, /* dst_mask */ 1196 FALSE), /* pcrel_offset */ 1197 1198 HOWTO (R_ARM_TLS_LE12, /* type */ 1199 0, /* rightshift */ 1200 2, /* size (0 = byte, 1 = short, 2 = long) */ 1201 12, /* bitsize */ 1202 FALSE, /* pc_relative */ 1203 0, /* bitpos */ 1204 complain_overflow_bitfield,/* complain_on_overflow */ 1205 bfd_elf_generic_reloc, /* special_function */ 1206 "R_ARM_TLS_LE12", /* name */ 1207 FALSE, /* partial_inplace */ 1208 0x00000fff, /* src_mask */ 1209 0x00000fff, /* dst_mask */ 1210 FALSE), /* pcrel_offset */ 1211 1212 HOWTO (R_ARM_TLS_IE12GP, /* type */ 1213 0, /* rightshift */ 1214 2, /* size (0 = byte, 1 = short, 2 = long) */ 1215 12, /* bitsize */ 1216 FALSE, /* pc_relative */ 1217 0, /* bitpos */ 1218 complain_overflow_bitfield,/* complain_on_overflow */ 1219 bfd_elf_generic_reloc, /* special_function */ 1220 "R_ARM_TLS_IE12GP", /* name */ 1221 FALSE, /* partial_inplace */ 1222 0x00000fff, /* src_mask */ 1223 0x00000fff, /* dst_mask */ 1224 FALSE), /* pcrel_offset */ 1225}; 1226 1227/* 112-127 private relocations 1228 128 R_ARM_ME_TOO, obsolete 1229 129-255 unallocated in AAELF. 1230 1231 249-255 extended, currently unused, relocations: */ 1232 1233static reloc_howto_type elf32_arm_howto_table_3[4] = 1234{ 1235 HOWTO (R_ARM_RREL32, /* type */ 1236 0, /* rightshift */ 1237 0, /* size (0 = byte, 1 = short, 2 = long) */ 1238 0, /* bitsize */ 1239 FALSE, /* pc_relative */ 1240 0, /* bitpos */ 1241 complain_overflow_dont,/* complain_on_overflow */ 1242 bfd_elf_generic_reloc, /* special_function */ 1243 "R_ARM_RREL32", /* name */ 1244 FALSE, /* partial_inplace */ 1245 0, /* src_mask */ 1246 0, /* dst_mask */ 1247 FALSE), /* pcrel_offset */ 1248 1249 HOWTO (R_ARM_RABS32, /* type */ 1250 0, /* rightshift */ 1251 0, /* size (0 = byte, 1 = short, 2 = long) */ 1252 0, /* bitsize */ 1253 FALSE, /* pc_relative */ 1254 0, /* bitpos */ 1255 complain_overflow_dont,/* complain_on_overflow */ 1256 bfd_elf_generic_reloc, /* special_function */ 1257 "R_ARM_RABS32", /* name */ 1258 FALSE, /* partial_inplace */ 1259 0, /* src_mask */ 1260 0, /* dst_mask */ 1261 FALSE), /* pcrel_offset */ 1262 1263 HOWTO (R_ARM_RPC24, /* type */ 1264 0, /* rightshift */ 1265 0, /* size (0 = byte, 1 = short, 2 = long) */ 1266 0, /* bitsize */ 1267 FALSE, /* pc_relative */ 1268 0, /* bitpos */ 1269 complain_overflow_dont,/* complain_on_overflow */ 1270 bfd_elf_generic_reloc, /* special_function */ 1271 "R_ARM_RPC24", /* name */ 1272 FALSE, /* partial_inplace */ 1273 0, /* src_mask */ 1274 0, /* dst_mask */ 1275 FALSE), /* pcrel_offset */ 1276 1277 HOWTO (R_ARM_RBASE, /* type */ 1278 0, /* rightshift */ 1279 0, /* size (0 = byte, 1 = short, 2 = long) */ 1280 0, /* bitsize */ 1281 FALSE, /* pc_relative */ 1282 0, /* bitpos */ 1283 complain_overflow_dont,/* complain_on_overflow */ 1284 bfd_elf_generic_reloc, /* special_function */ 1285 "R_ARM_RBASE", /* name */ 1286 FALSE, /* partial_inplace */ 1287 0, /* src_mask */ 1288 0, /* dst_mask */ 1289 FALSE) /* pcrel_offset */ 1290}; 1291 1292static reloc_howto_type * 1293elf32_arm_howto_from_type (unsigned int r_type) 1294{ 1295 if (r_type < NUM_ELEM (elf32_arm_howto_table_1)) 1296 return &elf32_arm_howto_table_1[r_type]; 1297 1298 if (r_type >= R_ARM_MOVW_BREL_NC 1299 && r_type < R_ARM_MOVW_BREL_NC + NUM_ELEM (elf32_arm_howto_table_2)) 1300 return &elf32_arm_howto_table_2[r_type - R_ARM_MOVW_BREL_NC]; 1301 1302 if (r_type >= R_ARM_RREL32 1303 && r_type < R_ARM_RREL32 + NUM_ELEM (elf32_arm_howto_table_2)) 1304 return &elf32_arm_howto_table_3[r_type - R_ARM_RREL32]; 1305 1306 return NULL; 1307} 1308 1309static void 1310elf32_arm_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED, arelent * bfd_reloc, 1311 Elf_Internal_Rela * elf_reloc) 1312{ 1313 unsigned int r_type; 1314 1315 r_type = ELF32_R_TYPE (elf_reloc->r_info); 1316 bfd_reloc->howto = elf32_arm_howto_from_type (r_type); 1317} 1318 1319struct elf32_arm_reloc_map 1320 { 1321 bfd_reloc_code_real_type bfd_reloc_val; 1322 unsigned char elf_reloc_val; 1323 }; 1324 1325/* All entries in this list must also be present in elf32_arm_howto_table. */ 1326static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] = 1327 { 1328 {BFD_RELOC_NONE, R_ARM_NONE}, 1329 {BFD_RELOC_ARM_PCREL_BRANCH, R_ARM_PC24}, 1330 {BFD_RELOC_ARM_PCREL_CALL, R_ARM_CALL}, 1331 {BFD_RELOC_ARM_PCREL_JUMP, R_ARM_JUMP24}, 1332 {BFD_RELOC_ARM_PCREL_BLX, R_ARM_XPC25}, 1333 {BFD_RELOC_THUMB_PCREL_BLX, R_ARM_THM_XPC22}, 1334 {BFD_RELOC_32, R_ARM_ABS32}, 1335 {BFD_RELOC_32_PCREL, R_ARM_REL32}, 1336 {BFD_RELOC_8, R_ARM_ABS8}, 1337 {BFD_RELOC_16, R_ARM_ABS16}, 1338 {BFD_RELOC_ARM_OFFSET_IMM, R_ARM_ABS12}, 1339 {BFD_RELOC_ARM_THUMB_OFFSET, R_ARM_THM_ABS5}, 1340 {BFD_RELOC_THUMB_PCREL_BRANCH25, R_ARM_THM_JUMP24}, 1341 {BFD_RELOC_THUMB_PCREL_BRANCH23, R_ARM_THM_CALL}, 1342 {BFD_RELOC_THUMB_PCREL_BRANCH12, R_ARM_THM_JUMP11}, 1343 {BFD_RELOC_THUMB_PCREL_BRANCH20, R_ARM_THM_JUMP19}, 1344 {BFD_RELOC_THUMB_PCREL_BRANCH9, R_ARM_THM_JUMP8}, 1345 {BFD_RELOC_THUMB_PCREL_BRANCH7, R_ARM_THM_JUMP6}, 1346 {BFD_RELOC_ARM_GLOB_DAT, R_ARM_GLOB_DAT}, 1347 {BFD_RELOC_ARM_JUMP_SLOT, R_ARM_JUMP_SLOT}, 1348 {BFD_RELOC_ARM_RELATIVE, R_ARM_RELATIVE}, 1349 {BFD_RELOC_ARM_GOTOFF, R_ARM_GOTOFF32}, 1350 {BFD_RELOC_ARM_GOTPC, R_ARM_GOTPC}, 1351 {BFD_RELOC_ARM_GOT32, R_ARM_GOT32}, 1352 {BFD_RELOC_ARM_PLT32, R_ARM_PLT32}, 1353 {BFD_RELOC_ARM_TARGET1, R_ARM_TARGET1}, 1354 {BFD_RELOC_ARM_ROSEGREL32, R_ARM_ROSEGREL32}, 1355 {BFD_RELOC_ARM_SBREL32, R_ARM_SBREL32}, 1356 {BFD_RELOC_ARM_PREL31, R_ARM_PREL31}, 1357 {BFD_RELOC_ARM_TARGET2, R_ARM_TARGET2}, 1358 {BFD_RELOC_ARM_PLT32, R_ARM_PLT32}, 1359 {BFD_RELOC_ARM_TLS_GD32, R_ARM_TLS_GD32}, 1360 {BFD_RELOC_ARM_TLS_LDO32, R_ARM_TLS_LDO32}, 1361 {BFD_RELOC_ARM_TLS_LDM32, R_ARM_TLS_LDM32}, 1362 {BFD_RELOC_ARM_TLS_DTPMOD32, R_ARM_TLS_DTPMOD32}, 1363 {BFD_RELOC_ARM_TLS_DTPOFF32, R_ARM_TLS_DTPOFF32}, 1364 {BFD_RELOC_ARM_TLS_TPOFF32, R_ARM_TLS_TPOFF32}, 1365 {BFD_RELOC_ARM_TLS_IE32, R_ARM_TLS_IE32}, 1366 {BFD_RELOC_ARM_TLS_LE32, R_ARM_TLS_LE32}, 1367 {BFD_RELOC_VTABLE_INHERIT, R_ARM_GNU_VTINHERIT}, 1368 {BFD_RELOC_VTABLE_ENTRY, R_ARM_GNU_VTENTRY}, 1369 }; 1370 1371static reloc_howto_type * 1372elf32_arm_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 1373 bfd_reloc_code_real_type code) 1374{ 1375 unsigned int i; 1376 for (i = 0; i < NUM_ELEM (elf32_arm_reloc_map); i ++) 1377 if (elf32_arm_reloc_map[i].bfd_reloc_val == code) 1378 return elf32_arm_howto_from_type (elf32_arm_reloc_map[i].elf_reloc_val); 1379 1380 return NULL; 1381} 1382 1383/* Support for core dump NOTE sections */ 1384static bfd_boolean 1385elf32_arm_nabi_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 1386{ 1387 int offset; 1388 size_t size; 1389 1390 switch (note->descsz) 1391 { 1392 default: 1393 return FALSE; 1394 1395 case 148: /* Linux/ARM 32-bit*/ 1396 /* pr_cursig */ 1397 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 1398 1399 /* pr_pid */ 1400 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); 1401 1402 /* pr_reg */ 1403 offset = 72; 1404 size = 72; 1405 1406 break; 1407 } 1408 1409 /* Make a ".reg/999" section. */ 1410 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 1411 size, note->descpos + offset); 1412} 1413 1414static bfd_boolean 1415elf32_arm_nabi_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 1416{ 1417 switch (note->descsz) 1418 { 1419 default: 1420 return FALSE; 1421 1422 case 124: /* Linux/ARM elf_prpsinfo */ 1423 elf_tdata (abfd)->core_program 1424 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 1425 elf_tdata (abfd)->core_command 1426 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 1427 } 1428 1429 /* Note that for some reason, a spurious space is tacked 1430 onto the end of the args in some (at least one anyway) 1431 implementations, so strip it off if it exists. */ 1432 1433 { 1434 char *command = elf_tdata (abfd)->core_command; 1435 int n = strlen (command); 1436 1437 if (0 < n && command[n - 1] == ' ') 1438 command[n - 1] = '\0'; 1439 } 1440 1441 return TRUE; 1442} 1443 1444#define TARGET_LITTLE_SYM bfd_elf32_littlearm_vec 1445#define TARGET_LITTLE_NAME "elf32-littlearm" 1446#define TARGET_BIG_SYM bfd_elf32_bigarm_vec 1447#define TARGET_BIG_NAME "elf32-bigarm" 1448 1449#define elf_backend_grok_prstatus elf32_arm_nabi_grok_prstatus 1450#define elf_backend_grok_psinfo elf32_arm_nabi_grok_psinfo 1451 1452typedef unsigned long int insn32; 1453typedef unsigned short int insn16; 1454 1455/* In lieu of proper flags, assume all EABIv4 or later objects are 1456 interworkable. */ 1457#define INTERWORK_FLAG(abfd) \ 1458 (EF_ARM_EABI_VERSION (elf_elfheader (abfd)->e_flags) >= EF_ARM_EABI_VER4 \ 1459 || (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK)) 1460 1461/* The linker script knows the section names for placement. 1462 The entry_names are used to do simple name mangling on the stubs. 1463 Given a function name, and its type, the stub can be found. The 1464 name can be changed. The only requirement is the %s be present. */ 1465#define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" 1466#define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" 1467 1468#define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" 1469#define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" 1470 1471/* The name of the dynamic interpreter. This is put in the .interp 1472 section. */ 1473#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 1474 1475#ifdef FOUR_WORD_PLT 1476 1477/* The first entry in a procedure linkage table looks like 1478 this. It is set up so that any shared library function that is 1479 called before the relocation has been set up calls the dynamic 1480 linker first. */ 1481static const bfd_vma elf32_arm_plt0_entry [] = 1482 { 1483 0xe52de004, /* str lr, [sp, #-4]! */ 1484 0xe59fe010, /* ldr lr, [pc, #16] */ 1485 0xe08fe00e, /* add lr, pc, lr */ 1486 0xe5bef008, /* ldr pc, [lr, #8]! */ 1487 }; 1488 1489/* Subsequent entries in a procedure linkage table look like 1490 this. */ 1491static const bfd_vma elf32_arm_plt_entry [] = 1492 { 1493 0xe28fc600, /* add ip, pc, #NN */ 1494 0xe28cca00, /* add ip, ip, #NN */ 1495 0xe5bcf000, /* ldr pc, [ip, #NN]! */ 1496 0x00000000, /* unused */ 1497 }; 1498 1499#else 1500 1501/* The first entry in a procedure linkage table looks like 1502 this. It is set up so that any shared library function that is 1503 called before the relocation has been set up calls the dynamic 1504 linker first. */ 1505static const bfd_vma elf32_arm_plt0_entry [] = 1506 { 1507 0xe52de004, /* str lr, [sp, #-4]! */ 1508 0xe59fe004, /* ldr lr, [pc, #4] */ 1509 0xe08fe00e, /* add lr, pc, lr */ 1510 0xe5bef008, /* ldr pc, [lr, #8]! */ 1511 0x00000000, /* &GOT[0] - . */ 1512 }; 1513 1514/* Subsequent entries in a procedure linkage table look like 1515 this. */ 1516static const bfd_vma elf32_arm_plt_entry [] = 1517 { 1518 0xe28fc600, /* add ip, pc, #0xNN00000 */ 1519 0xe28cca00, /* add ip, ip, #0xNN000 */ 1520 0xe5bcf000, /* ldr pc, [ip, #0xNNN]! */ 1521 }; 1522 1523#endif 1524 1525/* The format of the first entry in the procedure linkage table 1526 for a VxWorks executable. */ 1527static const bfd_vma elf32_arm_vxworks_exec_plt0_entry[] = 1528 { 1529 0xe52dc008, /* str ip,[sp,#-8]! */ 1530 0xe59fc000, /* ldr ip,[pc] */ 1531 0xe59cf008, /* ldr pc,[ip,#8] */ 1532 0x00000000, /* .long _GLOBAL_OFFSET_TABLE_ */ 1533 }; 1534 1535/* The format of subsequent entries in a VxWorks executable. */ 1536static const bfd_vma elf32_arm_vxworks_exec_plt_entry[] = 1537 { 1538 0xe59fc000, /* ldr ip,[pc] */ 1539 0xe59cf000, /* ldr pc,[ip] */ 1540 0x00000000, /* .long @got */ 1541 0xe59fc000, /* ldr ip,[pc] */ 1542 0xea000000, /* b _PLT */ 1543 0x00000000, /* .long @pltindex*sizeof(Elf32_Rela) */ 1544 }; 1545 1546/* The format of entries in a VxWorks shared library. */ 1547static const bfd_vma elf32_arm_vxworks_shared_plt_entry[] = 1548 { 1549 0xe59fc000, /* ldr ip,[pc] */ 1550 0xe79cf009, /* ldr pc,[ip,r9] */ 1551 0x00000000, /* .long @got */ 1552 0xe59fc000, /* ldr ip,[pc] */ 1553 0xe599f008, /* ldr pc,[r9,#8] */ 1554 0x00000000, /* .long @pltindex*sizeof(Elf32_Rela) */ 1555 }; 1556 1557/* An initial stub used if the PLT entry is referenced from Thumb code. */ 1558#define PLT_THUMB_STUB_SIZE 4 1559static const bfd_vma elf32_arm_plt_thumb_stub [] = 1560 { 1561 0x4778, /* bx pc */ 1562 0x46c0 /* nop */ 1563 }; 1564 1565/* The entries in a PLT when using a DLL-based target with multiple 1566 address spaces. */ 1567static const bfd_vma elf32_arm_symbian_plt_entry [] = 1568 { 1569 0xe51ff004, /* ldr pc, [pc, #-4] */ 1570 0x00000000, /* dcd R_ARM_GLOB_DAT(X) */ 1571 }; 1572 1573/* Used to build a map of a section. This is required for mixed-endian 1574 code/data. */ 1575 1576typedef struct elf32_elf_section_map 1577{ 1578 bfd_vma vma; 1579 char type; 1580} 1581elf32_arm_section_map; 1582 1583typedef struct _arm_elf_section_data 1584{ 1585 struct bfd_elf_section_data elf; 1586 unsigned int mapcount; 1587 elf32_arm_section_map *map; 1588} 1589_arm_elf_section_data; 1590 1591#define elf32_arm_section_data(sec) \ 1592 ((_arm_elf_section_data *) elf_section_data (sec)) 1593 1594/* The size of the thread control block. */ 1595#define TCB_SIZE 8 1596 1597#define NUM_KNOWN_ATTRIBUTES 32 1598 1599typedef struct aeabi_attribute 1600{ 1601 int type; 1602 unsigned int i; 1603 char *s; 1604} aeabi_attribute; 1605 1606typedef struct aeabi_attribute_list 1607{ 1608 struct aeabi_attribute_list *next; 1609 int tag; 1610 aeabi_attribute attr; 1611} aeabi_attribute_list; 1612 1613struct elf32_arm_obj_tdata 1614{ 1615 struct elf_obj_tdata root; 1616 1617 /* tls_type for each local got entry. */ 1618 char *local_got_tls_type; 1619 1620 aeabi_attribute known_eabi_attributes[NUM_KNOWN_ATTRIBUTES]; 1621 aeabi_attribute_list *other_eabi_attributes; 1622}; 1623 1624#define elf32_arm_tdata(abfd) \ 1625 ((struct elf32_arm_obj_tdata *) (abfd)->tdata.any) 1626 1627#define elf32_arm_local_got_tls_type(abfd) \ 1628 (elf32_arm_tdata (abfd)->local_got_tls_type) 1629 1630static bfd_boolean 1631elf32_arm_mkobject (bfd *abfd) 1632{ 1633 bfd_size_type amt = sizeof (struct elf32_arm_obj_tdata); 1634 abfd->tdata.any = bfd_zalloc (abfd, amt); 1635 if (abfd->tdata.any == NULL) 1636 return FALSE; 1637 return TRUE; 1638} 1639 1640/* The ARM linker needs to keep track of the number of relocs that it 1641 decides to copy in check_relocs for each symbol. This is so that 1642 it can discard PC relative relocs if it doesn't need them when 1643 linking with -Bsymbolic. We store the information in a field 1644 extending the regular ELF linker hash table. */ 1645 1646/* This structure keeps track of the number of relocs we have copied 1647 for a given symbol. */ 1648struct elf32_arm_relocs_copied 1649 { 1650 /* Next section. */ 1651 struct elf32_arm_relocs_copied * next; 1652 /* A section in dynobj. */ 1653 asection * section; 1654 /* Number of relocs copied in this section. */ 1655 bfd_size_type count; 1656 /* Number of PC-relative relocs copied in this section. */ 1657 bfd_size_type pc_count; 1658 }; 1659 1660#define elf32_arm_hash_entry(ent) ((struct elf32_arm_link_hash_entry *)(ent)) 1661 1662/* Arm ELF linker hash entry. */ 1663struct elf32_arm_link_hash_entry 1664 { 1665 struct elf_link_hash_entry root; 1666 1667 /* Number of PC relative relocs copied for this symbol. */ 1668 struct elf32_arm_relocs_copied * relocs_copied; 1669 1670 /* We reference count Thumb references to a PLT entry separately, 1671 so that we can emit the Thumb trampoline only if needed. */ 1672 bfd_signed_vma plt_thumb_refcount; 1673 1674 /* Since PLT entries have variable size if the Thumb prologue is 1675 used, we need to record the index into .got.plt instead of 1676 recomputing it from the PLT offset. */ 1677 bfd_signed_vma plt_got_offset; 1678 1679#define GOT_UNKNOWN 0 1680#define GOT_NORMAL 1 1681#define GOT_TLS_GD 2 1682#define GOT_TLS_IE 4 1683 unsigned char tls_type; 1684 }; 1685 1686/* Traverse an arm ELF linker hash table. */ 1687#define elf32_arm_link_hash_traverse(table, func, info) \ 1688 (elf_link_hash_traverse \ 1689 (&(table)->root, \ 1690 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \ 1691 (info))) 1692 1693/* Get the ARM elf linker hash table from a link_info structure. */ 1694#define elf32_arm_hash_table(info) \ 1695 ((struct elf32_arm_link_hash_table *) ((info)->hash)) 1696 1697/* ARM ELF linker hash table. */ 1698struct elf32_arm_link_hash_table 1699 { 1700 /* The main hash table. */ 1701 struct elf_link_hash_table root; 1702 1703 /* The size in bytes of the section containing the Thumb-to-ARM glue. */ 1704 bfd_size_type thumb_glue_size; 1705 1706 /* The size in bytes of the section containing the ARM-to-Thumb glue. */ 1707 bfd_size_type arm_glue_size; 1708 1709 /* An arbitrary input BFD chosen to hold the glue sections. */ 1710 bfd * bfd_of_glue_owner; 1711 1712 /* Nonzero to output a BE8 image. */ 1713 int byteswap_code; 1714 1715 /* Zero if R_ARM_TARGET1 means R_ARM_ABS32. 1716 Nonzero if R_ARM_TARGET1 means R_ARM_ABS32. */ 1717 int target1_is_rel; 1718 1719 /* The relocation to use for R_ARM_TARGET2 relocations. */ 1720 int target2_reloc; 1721 1722 /* Nonzero to fix BX instructions for ARMv4 targets. */ 1723 int fix_v4bx; 1724 1725 /* Nonzero if the ARM/Thumb BLX instructions are available for use. */ 1726 int use_blx; 1727 1728 /* The number of bytes in the initial entry in the PLT. */ 1729 bfd_size_type plt_header_size; 1730 1731 /* The number of bytes in the subsequent PLT etries. */ 1732 bfd_size_type plt_entry_size; 1733 1734 /* True if the target system is VxWorks. */ 1735 int vxworks_p; 1736 1737 /* True if the target system is Symbian OS. */ 1738 int symbian_p; 1739 1740 /* True if the target uses REL relocations. */ 1741 int use_rel; 1742 1743 /* Short-cuts to get to dynamic linker sections. */ 1744 asection *sgot; 1745 asection *sgotplt; 1746 asection *srelgot; 1747 asection *splt; 1748 asection *srelplt; 1749 asection *sdynbss; 1750 asection *srelbss; 1751 1752 /* The (unloaded but important) VxWorks .rela.plt.unloaded section. */ 1753 asection *srelplt2; 1754 1755 /* Data for R_ARM_TLS_LDM32 relocations. */ 1756 union { 1757 bfd_signed_vma refcount; 1758 bfd_vma offset; 1759 } tls_ldm_got; 1760 1761 /* Small local sym to section mapping cache. */ 1762 struct sym_sec_cache sym_sec; 1763 1764 /* For convenience in allocate_dynrelocs. */ 1765 bfd * obfd; 1766 }; 1767 1768/* Create an entry in an ARM ELF linker hash table. */ 1769 1770static struct bfd_hash_entry * 1771elf32_arm_link_hash_newfunc (struct bfd_hash_entry * entry, 1772 struct bfd_hash_table * table, 1773 const char * string) 1774{ 1775 struct elf32_arm_link_hash_entry * ret = 1776 (struct elf32_arm_link_hash_entry *) entry; 1777 1778 /* Allocate the structure if it has not already been allocated by a 1779 subclass. */ 1780 if (ret == (struct elf32_arm_link_hash_entry *) NULL) 1781 ret = bfd_hash_allocate (table, sizeof (struct elf32_arm_link_hash_entry)); 1782 if (ret == NULL) 1783 return (struct bfd_hash_entry *) ret; 1784 1785 /* Call the allocation method of the superclass. */ 1786 ret = ((struct elf32_arm_link_hash_entry *) 1787 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 1788 table, string)); 1789 if (ret != NULL) 1790 { 1791 ret->relocs_copied = NULL; 1792 ret->tls_type = GOT_UNKNOWN; 1793 ret->plt_thumb_refcount = 0; 1794 ret->plt_got_offset = -1; 1795 } 1796 1797 return (struct bfd_hash_entry *) ret; 1798} 1799 1800/* Return true if NAME is the name of the relocation section associated 1801 with S. */ 1802 1803static bfd_boolean 1804reloc_section_p (struct elf32_arm_link_hash_table *htab, 1805 const char *name, asection *s) 1806{ 1807 if (htab->use_rel) 1808 return strncmp (name, ".rel", 4) == 0 && strcmp (s->name, name + 4) == 0; 1809 else 1810 return strncmp (name, ".rela", 5) == 0 && strcmp (s->name, name + 5) == 0; 1811} 1812 1813/* Create .got, .gotplt, and .rel(a).got sections in DYNOBJ, and set up 1814 shortcuts to them in our hash table. */ 1815 1816static bfd_boolean 1817create_got_section (bfd *dynobj, struct bfd_link_info *info) 1818{ 1819 struct elf32_arm_link_hash_table *htab; 1820 1821 htab = elf32_arm_hash_table (info); 1822 /* BPABI objects never have a GOT, or associated sections. */ 1823 if (htab->symbian_p) 1824 return TRUE; 1825 1826 if (! _bfd_elf_create_got_section (dynobj, info)) 1827 return FALSE; 1828 1829 htab->sgot = bfd_get_section_by_name (dynobj, ".got"); 1830 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 1831 if (!htab->sgot || !htab->sgotplt) 1832 abort (); 1833 1834 htab->srelgot = bfd_make_section_with_flags (dynobj, 1835 RELOC_SECTION (htab, ".got"), 1836 (SEC_ALLOC | SEC_LOAD 1837 | SEC_HAS_CONTENTS 1838 | SEC_IN_MEMORY 1839 | SEC_LINKER_CREATED 1840 | SEC_READONLY)); 1841 if (htab->srelgot == NULL 1842 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) 1843 return FALSE; 1844 return TRUE; 1845} 1846 1847/* Create .plt, .rel(a).plt, .got, .got.plt, .rel(a).got, .dynbss, and 1848 .rel(a).bss sections in DYNOBJ, and set up shortcuts to them in our 1849 hash table. */ 1850 1851static bfd_boolean 1852elf32_arm_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 1853{ 1854 struct elf32_arm_link_hash_table *htab; 1855 1856 htab = elf32_arm_hash_table (info); 1857 if (!htab->sgot && !create_got_section (dynobj, info)) 1858 return FALSE; 1859 1860 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 1861 return FALSE; 1862 1863 htab->splt = bfd_get_section_by_name (dynobj, ".plt"); 1864 htab->srelplt = bfd_get_section_by_name (dynobj, 1865 RELOC_SECTION (htab, ".plt")); 1866 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 1867 if (!info->shared) 1868 htab->srelbss = bfd_get_section_by_name (dynobj, 1869 RELOC_SECTION (htab, ".bss")); 1870 1871 if (htab->vxworks_p) 1872 { 1873 if (!elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2)) 1874 return FALSE; 1875 1876 if (info->shared) 1877 { 1878 htab->plt_header_size = 0; 1879 htab->plt_entry_size 1880 = 4 * ARRAY_SIZE (elf32_arm_vxworks_shared_plt_entry); 1881 } 1882 else 1883 { 1884 htab->plt_header_size 1885 = 4 * ARRAY_SIZE (elf32_arm_vxworks_exec_plt0_entry); 1886 htab->plt_entry_size 1887 = 4 * ARRAY_SIZE (elf32_arm_vxworks_exec_plt_entry); 1888 } 1889 } 1890 1891 if (!htab->splt 1892 || !htab->srelplt 1893 || !htab->sdynbss 1894 || (!info->shared && !htab->srelbss)) 1895 abort (); 1896 1897 return TRUE; 1898} 1899 1900/* Copy the extra info we tack onto an elf_link_hash_entry. */ 1901 1902static void 1903elf32_arm_copy_indirect_symbol (struct bfd_link_info *info, 1904 struct elf_link_hash_entry *dir, 1905 struct elf_link_hash_entry *ind) 1906{ 1907 struct elf32_arm_link_hash_entry *edir, *eind; 1908 1909 edir = (struct elf32_arm_link_hash_entry *) dir; 1910 eind = (struct elf32_arm_link_hash_entry *) ind; 1911 1912 if (eind->relocs_copied != NULL) 1913 { 1914 if (edir->relocs_copied != NULL) 1915 { 1916 struct elf32_arm_relocs_copied **pp; 1917 struct elf32_arm_relocs_copied *p; 1918 1919 /* Add reloc counts against the indirect sym to the direct sym 1920 list. Merge any entries against the same section. */ 1921 for (pp = &eind->relocs_copied; (p = *pp) != NULL; ) 1922 { 1923 struct elf32_arm_relocs_copied *q; 1924 1925 for (q = edir->relocs_copied; q != NULL; q = q->next) 1926 if (q->section == p->section) 1927 { 1928 q->pc_count += p->pc_count; 1929 q->count += p->count; 1930 *pp = p->next; 1931 break; 1932 } 1933 if (q == NULL) 1934 pp = &p->next; 1935 } 1936 *pp = edir->relocs_copied; 1937 } 1938 1939 edir->relocs_copied = eind->relocs_copied; 1940 eind->relocs_copied = NULL; 1941 } 1942 1943 /* Copy over PLT info. */ 1944 edir->plt_thumb_refcount += eind->plt_thumb_refcount; 1945 eind->plt_thumb_refcount = 0; 1946 1947 if (ind->root.type == bfd_link_hash_indirect 1948 && dir->got.refcount <= 0) 1949 { 1950 edir->tls_type = eind->tls_type; 1951 eind->tls_type = GOT_UNKNOWN; 1952 } 1953 1954 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 1955} 1956 1957/* Create an ARM elf linker hash table. */ 1958 1959static struct bfd_link_hash_table * 1960elf32_arm_link_hash_table_create (bfd *abfd) 1961{ 1962 struct elf32_arm_link_hash_table *ret; 1963 bfd_size_type amt = sizeof (struct elf32_arm_link_hash_table); 1964 1965 ret = bfd_malloc (amt); 1966 if (ret == NULL) 1967 return NULL; 1968 1969 if (!_bfd_elf_link_hash_table_init (& ret->root, abfd, 1970 elf32_arm_link_hash_newfunc, 1971 sizeof (struct elf32_arm_link_hash_entry))) 1972 { 1973 free (ret); 1974 return NULL; 1975 } 1976 1977 ret->sgot = NULL; 1978 ret->sgotplt = NULL; 1979 ret->srelgot = NULL; 1980 ret->splt = NULL; 1981 ret->srelplt = NULL; 1982 ret->sdynbss = NULL; 1983 ret->srelbss = NULL; 1984 ret->srelplt2 = NULL; 1985 ret->thumb_glue_size = 0; 1986 ret->arm_glue_size = 0; 1987 ret->bfd_of_glue_owner = NULL; 1988 ret->byteswap_code = 0; 1989 ret->target1_is_rel = 0; 1990 ret->target2_reloc = R_ARM_NONE; 1991#ifdef FOUR_WORD_PLT 1992 ret->plt_header_size = 16; 1993 ret->plt_entry_size = 16; 1994#else 1995 ret->plt_header_size = 20; 1996 ret->plt_entry_size = 12; 1997#endif 1998 ret->fix_v4bx = 0; 1999 ret->use_blx = 0; 2000 ret->vxworks_p = 0; 2001 ret->symbian_p = 0; 2002 ret->use_rel = 1; 2003 ret->sym_sec.abfd = NULL; 2004 ret->obfd = abfd; 2005 ret->tls_ldm_got.refcount = 0; 2006 2007 return &ret->root.root; 2008} 2009 2010/* Locate the Thumb encoded calling stub for NAME. */ 2011 2012static struct elf_link_hash_entry * 2013find_thumb_glue (struct bfd_link_info *link_info, 2014 const char *name, 2015 bfd *input_bfd) 2016{ 2017 char *tmp_name; 2018 struct elf_link_hash_entry *hash; 2019 struct elf32_arm_link_hash_table *hash_table; 2020 2021 /* We need a pointer to the armelf specific hash table. */ 2022 hash_table = elf32_arm_hash_table (link_info); 2023 2024 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) 2025 + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); 2026 2027 BFD_ASSERT (tmp_name); 2028 2029 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); 2030 2031 hash = elf_link_hash_lookup 2032 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); 2033 2034 if (hash == NULL) 2035 /* xgettext:c-format */ 2036 (*_bfd_error_handler) (_("%B: unable to find THUMB glue '%s' for `%s'"), 2037 input_bfd, tmp_name, name); 2038 2039 free (tmp_name); 2040 2041 return hash; 2042} 2043 2044/* Locate the ARM encoded calling stub for NAME. */ 2045 2046static struct elf_link_hash_entry * 2047find_arm_glue (struct bfd_link_info *link_info, 2048 const char *name, 2049 bfd *input_bfd) 2050{ 2051 char *tmp_name; 2052 struct elf_link_hash_entry *myh; 2053 struct elf32_arm_link_hash_table *hash_table; 2054 2055 /* We need a pointer to the elfarm specific hash table. */ 2056 hash_table = elf32_arm_hash_table (link_info); 2057 2058 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) 2059 + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1); 2060 2061 BFD_ASSERT (tmp_name); 2062 2063 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); 2064 2065 myh = elf_link_hash_lookup 2066 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); 2067 2068 if (myh == NULL) 2069 /* xgettext:c-format */ 2070 (*_bfd_error_handler) (_("%B: unable to find ARM glue '%s' for `%s'"), 2071 input_bfd, tmp_name, name); 2072 2073 free (tmp_name); 2074 2075 return myh; 2076} 2077 2078/* ARM->Thumb glue (static images): 2079 2080 .arm 2081 __func_from_arm: 2082 ldr r12, __func_addr 2083 bx r12 2084 __func_addr: 2085 .word func @ behave as if you saw a ARM_32 reloc. 2086 2087 (relocatable images) 2088 .arm 2089 __func_from_arm: 2090 ldr r12, __func_offset 2091 add r12, r12, pc 2092 bx r12 2093 __func_offset: 2094 .word func - . 2095 */ 2096 2097#define ARM2THUMB_STATIC_GLUE_SIZE 12 2098static const insn32 a2t1_ldr_insn = 0xe59fc000; 2099static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; 2100static const insn32 a2t3_func_addr_insn = 0x00000001; 2101 2102#define ARM2THUMB_PIC_GLUE_SIZE 16 2103static const insn32 a2t1p_ldr_insn = 0xe59fc004; 2104static const insn32 a2t2p_add_pc_insn = 0xe08cc00f; 2105static const insn32 a2t3p_bx_r12_insn = 0xe12fff1c; 2106 2107/* Thumb->ARM: Thumb->(non-interworking aware) ARM 2108 2109 .thumb .thumb 2110 .align 2 .align 2 2111 __func_from_thumb: __func_from_thumb: 2112 bx pc push {r6, lr} 2113 nop ldr r6, __func_addr 2114 .arm mov lr, pc 2115 __func_change_to_arm: bx r6 2116 b func .arm 2117 __func_back_to_thumb: 2118 ldmia r13! {r6, lr} 2119 bx lr 2120 __func_addr: 2121 .word func */ 2122 2123#define THUMB2ARM_GLUE_SIZE 8 2124static const insn16 t2a1_bx_pc_insn = 0x4778; 2125static const insn16 t2a2_noop_insn = 0x46c0; 2126static const insn32 t2a3_b_insn = 0xea000000; 2127 2128#ifndef ELFARM_NABI_C_INCLUDED 2129bfd_boolean 2130bfd_elf32_arm_allocate_interworking_sections (struct bfd_link_info * info) 2131{ 2132 asection * s; 2133 bfd_byte * foo; 2134 struct elf32_arm_link_hash_table * globals; 2135 2136 globals = elf32_arm_hash_table (info); 2137 2138 BFD_ASSERT (globals != NULL); 2139 2140 if (globals->arm_glue_size != 0) 2141 { 2142 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 2143 2144 s = bfd_get_section_by_name (globals->bfd_of_glue_owner, 2145 ARM2THUMB_GLUE_SECTION_NAME); 2146 2147 BFD_ASSERT (s != NULL); 2148 2149 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size); 2150 2151 s->size = globals->arm_glue_size; 2152 s->contents = foo; 2153 } 2154 2155 if (globals->thumb_glue_size != 0) 2156 { 2157 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 2158 2159 s = bfd_get_section_by_name 2160 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); 2161 2162 BFD_ASSERT (s != NULL); 2163 2164 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size); 2165 2166 s->size = globals->thumb_glue_size; 2167 s->contents = foo; 2168 } 2169 2170 return TRUE; 2171} 2172 2173static void 2174record_arm_to_thumb_glue (struct bfd_link_info * link_info, 2175 struct elf_link_hash_entry * h) 2176{ 2177 const char * name = h->root.root.string; 2178 asection * s; 2179 char * tmp_name; 2180 struct elf_link_hash_entry * myh; 2181 struct bfd_link_hash_entry * bh; 2182 struct elf32_arm_link_hash_table * globals; 2183 bfd_vma val; 2184 2185 globals = elf32_arm_hash_table (link_info); 2186 2187 BFD_ASSERT (globals != NULL); 2188 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 2189 2190 s = bfd_get_section_by_name 2191 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); 2192 2193 BFD_ASSERT (s != NULL); 2194 2195 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1); 2196 2197 BFD_ASSERT (tmp_name); 2198 2199 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); 2200 2201 myh = elf_link_hash_lookup 2202 (&(globals)->root, tmp_name, FALSE, FALSE, TRUE); 2203 2204 if (myh != NULL) 2205 { 2206 /* We've already seen this guy. */ 2207 free (tmp_name); 2208 return; 2209 } 2210 2211 /* The only trick here is using hash_table->arm_glue_size as the value. 2212 Even though the section isn't allocated yet, this is where we will be 2213 putting it. */ 2214 bh = NULL; 2215 val = globals->arm_glue_size + 1; 2216 _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner, 2217 tmp_name, BSF_GLOBAL, s, val, 2218 NULL, TRUE, FALSE, &bh); 2219 2220 myh = (struct elf_link_hash_entry *) bh; 2221 myh->type = ELF_ST_INFO (STB_LOCAL, STT_FUNC); 2222 myh->forced_local = 1; 2223 2224 free (tmp_name); 2225 2226 if ((link_info->shared || globals->root.is_relocatable_executable)) 2227 globals->arm_glue_size += ARM2THUMB_PIC_GLUE_SIZE; 2228 else 2229 globals->arm_glue_size += ARM2THUMB_STATIC_GLUE_SIZE; 2230 2231 return; 2232} 2233 2234static void 2235record_thumb_to_arm_glue (struct bfd_link_info *link_info, 2236 struct elf_link_hash_entry *h) 2237{ 2238 const char *name = h->root.root.string; 2239 asection *s; 2240 char *tmp_name; 2241 struct elf_link_hash_entry *myh; 2242 struct bfd_link_hash_entry *bh; 2243 struct elf32_arm_link_hash_table *hash_table; 2244 bfd_vma val; 2245 2246 hash_table = elf32_arm_hash_table (link_info); 2247 2248 BFD_ASSERT (hash_table != NULL); 2249 BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL); 2250 2251 s = bfd_get_section_by_name 2252 (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); 2253 2254 BFD_ASSERT (s != NULL); 2255 2256 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) 2257 + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); 2258 2259 BFD_ASSERT (tmp_name); 2260 2261 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); 2262 2263 myh = elf_link_hash_lookup 2264 (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); 2265 2266 if (myh != NULL) 2267 { 2268 /* We've already seen this guy. */ 2269 free (tmp_name); 2270 return; 2271 } 2272 2273 bh = NULL; 2274 val = hash_table->thumb_glue_size + 1; 2275 _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, 2276 tmp_name, BSF_GLOBAL, s, val, 2277 NULL, TRUE, FALSE, &bh); 2278 2279 /* If we mark it 'Thumb', the disassembler will do a better job. */ 2280 myh = (struct elf_link_hash_entry *) bh; 2281 myh->type = ELF_ST_INFO (STB_LOCAL, STT_ARM_TFUNC); 2282 myh->forced_local = 1; 2283 2284 free (tmp_name); 2285 2286#define CHANGE_TO_ARM "__%s_change_to_arm" 2287#define BACK_FROM_ARM "__%s_back_from_arm" 2288 2289 /* Allocate another symbol to mark where we switch to Arm mode. */ 2290 tmp_name = bfd_malloc ((bfd_size_type) strlen (name) 2291 + strlen (CHANGE_TO_ARM) + 1); 2292 2293 BFD_ASSERT (tmp_name); 2294 2295 sprintf (tmp_name, CHANGE_TO_ARM, name); 2296 2297 bh = NULL; 2298 val = hash_table->thumb_glue_size + 4, 2299 _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, 2300 tmp_name, BSF_LOCAL, s, val, 2301 NULL, TRUE, FALSE, &bh); 2302 2303 free (tmp_name); 2304 2305 hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE; 2306 2307 return; 2308} 2309 2310/* Add the glue sections to ABFD. This function is called from the 2311 linker scripts in ld/emultempl/{armelf}.em. */ 2312 2313bfd_boolean 2314bfd_elf32_arm_add_glue_sections_to_bfd (bfd *abfd, 2315 struct bfd_link_info *info) 2316{ 2317 flagword flags; 2318 asection *sec; 2319 2320 /* If we are only performing a partial 2321 link do not bother adding the glue. */ 2322 if (info->relocatable) 2323 return TRUE; 2324 2325 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); 2326 2327 if (sec == NULL) 2328 { 2329 /* Note: we do not include the flag SEC_LINKER_CREATED, as this 2330 will prevent elf_link_input_bfd() from processing the contents 2331 of this section. */ 2332 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; 2333 2334 sec = bfd_make_section_with_flags (abfd, 2335 ARM2THUMB_GLUE_SECTION_NAME, 2336 flags); 2337 2338 if (sec == NULL 2339 || !bfd_set_section_alignment (abfd, sec, 2)) 2340 return FALSE; 2341 2342 /* Set the gc mark to prevent the section from being removed by garbage 2343 collection, despite the fact that no relocs refer to this section. */ 2344 sec->gc_mark = 1; 2345 } 2346 2347 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME); 2348 2349 if (sec == NULL) 2350 { 2351 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 2352 | SEC_CODE | SEC_READONLY; 2353 2354 sec = bfd_make_section_with_flags (abfd, 2355 THUMB2ARM_GLUE_SECTION_NAME, 2356 flags); 2357 2358 if (sec == NULL 2359 || !bfd_set_section_alignment (abfd, sec, 2)) 2360 return FALSE; 2361 2362 sec->gc_mark = 1; 2363 } 2364 2365 return TRUE; 2366} 2367 2368/* Select a BFD to be used to hold the sections used by the glue code. 2369 This function is called from the linker scripts in ld/emultempl/ 2370 {armelf/pe}.em */ 2371 2372bfd_boolean 2373bfd_elf32_arm_get_bfd_for_interworking (bfd *abfd, struct bfd_link_info *info) 2374{ 2375 struct elf32_arm_link_hash_table *globals; 2376 2377 /* If we are only performing a partial link 2378 do not bother getting a bfd to hold the glue. */ 2379 if (info->relocatable) 2380 return TRUE; 2381 2382 /* Make sure we don't attach the glue sections to a dynamic object. */ 2383 BFD_ASSERT (!(abfd->flags & DYNAMIC)); 2384 2385 globals = elf32_arm_hash_table (info); 2386 2387 BFD_ASSERT (globals != NULL); 2388 2389 if (globals->bfd_of_glue_owner != NULL) 2390 return TRUE; 2391 2392 /* Save the bfd for later use. */ 2393 globals->bfd_of_glue_owner = abfd; 2394 2395 return TRUE; 2396} 2397 2398static void check_use_blx(struct elf32_arm_link_hash_table *globals) 2399{ 2400 if (elf32_arm_get_eabi_attr_int (globals->obfd, Tag_CPU_arch) > 2) 2401 globals->use_blx = 1; 2402} 2403 2404bfd_boolean 2405bfd_elf32_arm_process_before_allocation (bfd *abfd, 2406 struct bfd_link_info *link_info, 2407 int byteswap_code) 2408{ 2409 Elf_Internal_Shdr *symtab_hdr; 2410 Elf_Internal_Rela *internal_relocs = NULL; 2411 Elf_Internal_Rela *irel, *irelend; 2412 bfd_byte *contents = NULL; 2413 2414 asection *sec; 2415 struct elf32_arm_link_hash_table *globals; 2416 2417 /* If we are only performing a partial link do not bother 2418 to construct any glue. */ 2419 if (link_info->relocatable) 2420 return TRUE; 2421 2422 /* Here we have a bfd that is to be included on the link. We have a hook 2423 to do reloc rummaging, before section sizes are nailed down. */ 2424 globals = elf32_arm_hash_table (link_info); 2425 check_use_blx (globals); 2426 2427 BFD_ASSERT (globals != NULL); 2428 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 2429 2430 if (byteswap_code && !bfd_big_endian (abfd)) 2431 { 2432 _bfd_error_handler (_("%B: BE8 images only valid in big-endian mode."), 2433 abfd); 2434 return FALSE; 2435 } 2436 globals->byteswap_code = byteswap_code; 2437 2438 /* Rummage around all the relocs and map the glue vectors. */ 2439 sec = abfd->sections; 2440 2441 if (sec == NULL) 2442 return TRUE; 2443 2444 for (; sec != NULL; sec = sec->next) 2445 { 2446 if (sec->reloc_count == 0) 2447 continue; 2448 2449 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2450 2451 /* Load the relocs. */ 2452 internal_relocs 2453 = _bfd_elf_link_read_relocs (abfd, sec, (void *) NULL, 2454 (Elf_Internal_Rela *) NULL, FALSE); 2455 2456 if (internal_relocs == NULL) 2457 goto error_return; 2458 2459 irelend = internal_relocs + sec->reloc_count; 2460 for (irel = internal_relocs; irel < irelend; irel++) 2461 { 2462 long r_type; 2463 unsigned long r_index; 2464 2465 struct elf_link_hash_entry *h; 2466 2467 r_type = ELF32_R_TYPE (irel->r_info); 2468 r_index = ELF32_R_SYM (irel->r_info); 2469 2470 /* These are the only relocation types we care about. */ 2471 if ( r_type != R_ARM_PC24 2472 && r_type != R_ARM_PLT32 2473 && r_type != R_ARM_CALL 2474 && r_type != R_ARM_JUMP24 2475 && r_type != R_ARM_THM_CALL) 2476 continue; 2477 2478 /* Get the section contents if we haven't done so already. */ 2479 if (contents == NULL) 2480 { 2481 /* Get cached copy if it exists. */ 2482 if (elf_section_data (sec)->this_hdr.contents != NULL) 2483 contents = elf_section_data (sec)->this_hdr.contents; 2484 else 2485 { 2486 /* Go get them off disk. */ 2487 if (! bfd_malloc_and_get_section (abfd, sec, &contents)) 2488 goto error_return; 2489 } 2490 } 2491 2492 /* If the relocation is not against a symbol it cannot concern us. */ 2493 h = NULL; 2494 2495 /* We don't care about local symbols. */ 2496 if (r_index < symtab_hdr->sh_info) 2497 continue; 2498 2499 /* This is an external symbol. */ 2500 r_index -= symtab_hdr->sh_info; 2501 h = (struct elf_link_hash_entry *) 2502 elf_sym_hashes (abfd)[r_index]; 2503 2504 /* If the relocation is against a static symbol it must be within 2505 the current section and so cannot be a cross ARM/Thumb relocation. */ 2506 if (h == NULL) 2507 continue; 2508 2509 /* If the call will go through a PLT entry then we do not need 2510 glue. */ 2511 if (globals->splt != NULL && h->plt.offset != (bfd_vma) -1) 2512 continue; 2513 2514 switch (r_type) 2515 { 2516 case R_ARM_PC24: 2517 case R_ARM_PLT32: 2518 case R_ARM_CALL: 2519 case R_ARM_JUMP24: 2520 /* This one is a call from arm code. We need to look up 2521 the target of the call. If it is a thumb target, we 2522 insert glue. */ 2523 if (ELF_ST_TYPE(h->type) == STT_ARM_TFUNC 2524 && !(r_type == R_ARM_CALL && globals->use_blx)) 2525 record_arm_to_thumb_glue (link_info, h); 2526 break; 2527 2528 case R_ARM_THM_CALL: 2529 /* This one is a call from thumb code. We look 2530 up the target of the call. If it is not a thumb 2531 target, we insert glue. */ 2532 if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC && !globals->use_blx) 2533 record_thumb_to_arm_glue (link_info, h); 2534 break; 2535 2536 default: 2537 abort (); 2538 } 2539 } 2540 2541 if (contents != NULL 2542 && elf_section_data (sec)->this_hdr.contents != contents) 2543 free (contents); 2544 contents = NULL; 2545 2546 if (internal_relocs != NULL 2547 && elf_section_data (sec)->relocs != internal_relocs) 2548 free (internal_relocs); 2549 internal_relocs = NULL; 2550 } 2551 2552 return TRUE; 2553 2554error_return: 2555 if (contents != NULL 2556 && elf_section_data (sec)->this_hdr.contents != contents) 2557 free (contents); 2558 if (internal_relocs != NULL 2559 && elf_section_data (sec)->relocs != internal_relocs) 2560 free (internal_relocs); 2561 2562 return FALSE; 2563} 2564#endif 2565 2566 2567/* Set target relocation values needed during linking. */ 2568 2569void 2570bfd_elf32_arm_set_target_relocs (struct bfd_link_info *link_info, 2571 int target1_is_rel, 2572 char * target2_type, 2573 int fix_v4bx, 2574 int use_blx) 2575{ 2576 struct elf32_arm_link_hash_table *globals; 2577 2578 globals = elf32_arm_hash_table (link_info); 2579 2580 globals->target1_is_rel = target1_is_rel; 2581 if (strcmp (target2_type, "rel") == 0) 2582 globals->target2_reloc = R_ARM_REL32; 2583 else if (strcmp (target2_type, "abs") == 0) 2584 globals->target2_reloc = R_ARM_ABS32; 2585 else if (strcmp (target2_type, "got-rel") == 0) 2586 globals->target2_reloc = R_ARM_GOT_PREL; 2587 else 2588 { 2589 _bfd_error_handler (_("Invalid TARGET2 relocation type '%s'."), 2590 target2_type); 2591 } 2592 globals->fix_v4bx = fix_v4bx; 2593 globals->use_blx |= use_blx; 2594} 2595 2596/* The thumb form of a long branch is a bit finicky, because the offset 2597 encoding is split over two fields, each in it's own instruction. They 2598 can occur in any order. So given a thumb form of long branch, and an 2599 offset, insert the offset into the thumb branch and return finished 2600 instruction. 2601 2602 It takes two thumb instructions to encode the target address. Each has 2603 11 bits to invest. The upper 11 bits are stored in one (identified by 2604 H-0.. see below), the lower 11 bits are stored in the other (identified 2605 by H-1). 2606 2607 Combine together and shifted left by 1 (it's a half word address) and 2608 there you have it. 2609 2610 Op: 1111 = F, 2611 H-0, upper address-0 = 000 2612 Op: 1111 = F, 2613 H-1, lower address-0 = 800 2614 2615 They can be ordered either way, but the arm tools I've seen always put 2616 the lower one first. It probably doesn't matter. krk@cygnus.com 2617 2618 XXX: Actually the order does matter. The second instruction (H-1) 2619 moves the computed address into the PC, so it must be the second one 2620 in the sequence. The problem, however is that whilst little endian code 2621 stores the instructions in HI then LOW order, big endian code does the 2622 reverse. nickc@cygnus.com. */ 2623 2624#define LOW_HI_ORDER 0xF800F000 2625#define HI_LOW_ORDER 0xF000F800 2626 2627static insn32 2628insert_thumb_branch (insn32 br_insn, int rel_off) 2629{ 2630 unsigned int low_bits; 2631 unsigned int high_bits; 2632 2633 BFD_ASSERT ((rel_off & 1) != 1); 2634 2635 rel_off >>= 1; /* Half word aligned address. */ 2636 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */ 2637 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */ 2638 2639 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER) 2640 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits; 2641 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER) 2642 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits; 2643 else 2644 /* FIXME: abort is probably not the right call. krk@cygnus.com */ 2645 abort (); /* Error - not a valid branch instruction form. */ 2646 2647 return br_insn; 2648} 2649 2650/* Thumb code calling an ARM function. */ 2651 2652static int 2653elf32_thumb_to_arm_stub (struct bfd_link_info * info, 2654 const char * name, 2655 bfd * input_bfd, 2656 bfd * output_bfd, 2657 asection * input_section, 2658 bfd_byte * hit_data, 2659 asection * sym_sec, 2660 bfd_vma offset, 2661 bfd_signed_vma addend, 2662 bfd_vma val) 2663{ 2664 asection * s = 0; 2665 bfd_vma my_offset; 2666 unsigned long int tmp; 2667 long int ret_offset; 2668 struct elf_link_hash_entry * myh; 2669 struct elf32_arm_link_hash_table * globals; 2670 2671 myh = find_thumb_glue (info, name, input_bfd); 2672 if (myh == NULL) 2673 return FALSE; 2674 2675 globals = elf32_arm_hash_table (info); 2676 2677 BFD_ASSERT (globals != NULL); 2678 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 2679 2680 my_offset = myh->root.u.def.value; 2681 2682 s = bfd_get_section_by_name (globals->bfd_of_glue_owner, 2683 THUMB2ARM_GLUE_SECTION_NAME); 2684 2685 BFD_ASSERT (s != NULL); 2686 BFD_ASSERT (s->contents != NULL); 2687 BFD_ASSERT (s->output_section != NULL); 2688 2689 if ((my_offset & 0x01) == 0x01) 2690 { 2691 if (sym_sec != NULL 2692 && sym_sec->owner != NULL 2693 && !INTERWORK_FLAG (sym_sec->owner)) 2694 { 2695 (*_bfd_error_handler) 2696 (_("%B(%s): warning: interworking not enabled.\n" 2697 " first occurrence: %B: thumb call to arm"), 2698 sym_sec->owner, input_bfd, name); 2699 2700 return FALSE; 2701 } 2702 2703 --my_offset; 2704 myh->root.u.def.value = my_offset; 2705 2706 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn, 2707 s->contents + my_offset); 2708 2709 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn, 2710 s->contents + my_offset + 2); 2711 2712 ret_offset = 2713 /* Address of destination of the stub. */ 2714 ((bfd_signed_vma) val) 2715 - ((bfd_signed_vma) 2716 /* Offset from the start of the current section 2717 to the start of the stubs. */ 2718 (s->output_offset 2719 /* Offset of the start of this stub from the start of the stubs. */ 2720 + my_offset 2721 /* Address of the start of the current section. */ 2722 + s->output_section->vma) 2723 /* The branch instruction is 4 bytes into the stub. */ 2724 + 4 2725 /* ARM branches work from the pc of the instruction + 8. */ 2726 + 8); 2727 2728 bfd_put_32 (output_bfd, 2729 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), 2730 s->contents + my_offset + 4); 2731 } 2732 2733 BFD_ASSERT (my_offset <= globals->thumb_glue_size); 2734 2735 /* Now go back and fix up the original BL insn to point to here. */ 2736 ret_offset = 2737 /* Address of where the stub is located. */ 2738 (s->output_section->vma + s->output_offset + my_offset) 2739 /* Address of where the BL is located. */ 2740 - (input_section->output_section->vma + input_section->output_offset 2741 + offset) 2742 /* Addend in the relocation. */ 2743 - addend 2744 /* Biassing for PC-relative addressing. */ 2745 - 8; 2746 2747 tmp = bfd_get_32 (input_bfd, hit_data 2748 - input_section->vma); 2749 2750 bfd_put_32 (output_bfd, 2751 (bfd_vma) insert_thumb_branch (tmp, ret_offset), 2752 hit_data - input_section->vma); 2753 2754 return TRUE; 2755} 2756 2757/* Arm code calling a Thumb function. */ 2758 2759static int 2760elf32_arm_to_thumb_stub (struct bfd_link_info * info, 2761 const char * name, 2762 bfd * input_bfd, 2763 bfd * output_bfd, 2764 asection * input_section, 2765 bfd_byte * hit_data, 2766 asection * sym_sec, 2767 bfd_vma offset, 2768 bfd_signed_vma addend, 2769 bfd_vma val) 2770{ 2771 unsigned long int tmp; 2772 bfd_vma my_offset; 2773 asection * s; 2774 long int ret_offset; 2775 struct elf_link_hash_entry * myh; 2776 struct elf32_arm_link_hash_table * globals; 2777 2778 myh = find_arm_glue (info, name, input_bfd); 2779 if (myh == NULL) 2780 return FALSE; 2781 2782 globals = elf32_arm_hash_table (info); 2783 2784 BFD_ASSERT (globals != NULL); 2785 BFD_ASSERT (globals->bfd_of_glue_owner != NULL); 2786 2787 my_offset = myh->root.u.def.value; 2788 s = bfd_get_section_by_name (globals->bfd_of_glue_owner, 2789 ARM2THUMB_GLUE_SECTION_NAME); 2790 BFD_ASSERT (s != NULL); 2791 BFD_ASSERT (s->contents != NULL); 2792 BFD_ASSERT (s->output_section != NULL); 2793 2794 if ((my_offset & 0x01) == 0x01) 2795 { 2796 if (sym_sec != NULL 2797 && sym_sec->owner != NULL 2798 && !INTERWORK_FLAG (sym_sec->owner)) 2799 { 2800 (*_bfd_error_handler) 2801 (_("%B(%s): warning: interworking not enabled.\n" 2802 " first occurrence: %B: arm call to thumb"), 2803 sym_sec->owner, input_bfd, name); 2804 } 2805 2806 --my_offset; 2807 myh->root.u.def.value = my_offset; 2808 2809 if ((info->shared || globals->root.is_relocatable_executable)) 2810 { 2811 /* For relocatable objects we can't use absolute addresses, 2812 so construct the address from a relative offset. */ 2813 /* TODO: If the offset is small it's probably worth 2814 constructing the address with adds. */ 2815 bfd_put_32 (output_bfd, (bfd_vma) a2t1p_ldr_insn, 2816 s->contents + my_offset); 2817 bfd_put_32 (output_bfd, (bfd_vma) a2t2p_add_pc_insn, 2818 s->contents + my_offset + 4); 2819 bfd_put_32 (output_bfd, (bfd_vma) a2t3p_bx_r12_insn, 2820 s->contents + my_offset + 8); 2821 /* Adjust the offset by 4 for the position of the add, 2822 and 8 for the pipeline offset. */ 2823 ret_offset = (val - (s->output_offset 2824 + s->output_section->vma 2825 + my_offset + 12)) 2826 | 1; 2827 bfd_put_32 (output_bfd, ret_offset, 2828 s->contents + my_offset + 12); 2829 } 2830 else 2831 { 2832 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn, 2833 s->contents + my_offset); 2834 2835 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn, 2836 s->contents + my_offset + 4); 2837 2838 /* It's a thumb address. Add the low order bit. */ 2839 bfd_put_32 (output_bfd, val | a2t3_func_addr_insn, 2840 s->contents + my_offset + 8); 2841 } 2842 } 2843 2844 BFD_ASSERT (my_offset <= globals->arm_glue_size); 2845 2846 tmp = bfd_get_32 (input_bfd, hit_data); 2847 tmp = tmp & 0xFF000000; 2848 2849 /* Somehow these are both 4 too far, so subtract 8. */ 2850 ret_offset = (s->output_offset 2851 + my_offset 2852 + s->output_section->vma 2853 - (input_section->output_offset 2854 + input_section->output_section->vma 2855 + offset + addend) 2856 - 8); 2857 2858 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); 2859 2860 bfd_put_32 (output_bfd, (bfd_vma) tmp, hit_data - input_section->vma); 2861 2862 return TRUE; 2863} 2864 2865/* Some relocations map to different relocations depending on the 2866 target. Return the real relocation. */ 2867static int 2868arm_real_reloc_type (struct elf32_arm_link_hash_table * globals, 2869 int r_type) 2870{ 2871 switch (r_type) 2872 { 2873 case R_ARM_TARGET1: 2874 if (globals->target1_is_rel) 2875 return R_ARM_REL32; 2876 else 2877 return R_ARM_ABS32; 2878 2879 case R_ARM_TARGET2: 2880 return globals->target2_reloc; 2881 2882 default: 2883 return r_type; 2884 } 2885} 2886 2887/* Return the base VMA address which should be subtracted from real addresses 2888 when resolving @dtpoff relocation. 2889 This is PT_TLS segment p_vaddr. */ 2890 2891static bfd_vma 2892dtpoff_base (struct bfd_link_info *info) 2893{ 2894 /* If tls_sec is NULL, we should have signalled an error already. */ 2895 if (elf_hash_table (info)->tls_sec == NULL) 2896 return 0; 2897 return elf_hash_table (info)->tls_sec->vma; 2898} 2899 2900/* Return the relocation value for @tpoff relocation 2901 if STT_TLS virtual address is ADDRESS. */ 2902 2903static bfd_vma 2904tpoff (struct bfd_link_info *info, bfd_vma address) 2905{ 2906 struct elf_link_hash_table *htab = elf_hash_table (info); 2907 bfd_vma base; 2908 2909 /* If tls_sec is NULL, we should have signalled an error already. */ 2910 if (htab->tls_sec == NULL) 2911 return 0; 2912 base = align_power ((bfd_vma) TCB_SIZE, htab->tls_sec->alignment_power); 2913 return address - htab->tls_sec->vma + base; 2914} 2915 2916/* Perform an R_ARM_ABS12 relocation on the field pointed to by DATA. 2917 VALUE is the relocation value. */ 2918 2919static bfd_reloc_status_type 2920elf32_arm_abs12_reloc (bfd *abfd, void *data, bfd_vma value) 2921{ 2922 if (value > 0xfff) 2923 return bfd_reloc_overflow; 2924 2925 value |= bfd_get_32 (abfd, data) & 0xfffff000; 2926 bfd_put_32 (abfd, value, data); 2927 return bfd_reloc_ok; 2928} 2929 2930/* Perform a relocation as part of a final link. */ 2931 2932static bfd_reloc_status_type 2933elf32_arm_final_link_relocate (reloc_howto_type * howto, 2934 bfd * input_bfd, 2935 bfd * output_bfd, 2936 asection * input_section, 2937 bfd_byte * contents, 2938 Elf_Internal_Rela * rel, 2939 bfd_vma value, 2940 struct bfd_link_info * info, 2941 asection * sym_sec, 2942 const char * sym_name, 2943 int sym_flags, 2944 struct elf_link_hash_entry * h, 2945 bfd_boolean * unresolved_reloc_p) 2946{ 2947 unsigned long r_type = howto->type; 2948 unsigned long r_symndx; 2949 bfd_byte * hit_data = contents + rel->r_offset; 2950 bfd * dynobj = NULL; 2951 Elf_Internal_Shdr * symtab_hdr; 2952 struct elf_link_hash_entry ** sym_hashes; 2953 bfd_vma * local_got_offsets; 2954 asection * sgot = NULL; 2955 asection * splt = NULL; 2956 asection * sreloc = NULL; 2957 bfd_vma addend; 2958 bfd_signed_vma signed_addend; 2959 struct elf32_arm_link_hash_table * globals; 2960 2961 globals = elf32_arm_hash_table (info); 2962 2963 /* Some relocation type map to different relocations depending on the 2964 target. We pick the right one here. */ 2965 r_type = arm_real_reloc_type (globals, r_type); 2966 if (r_type != howto->type) 2967 howto = elf32_arm_howto_from_type (r_type); 2968 2969 /* If the start address has been set, then set the EF_ARM_HASENTRY 2970 flag. Setting this more than once is redundant, but the cost is 2971 not too high, and it keeps the code simple. 2972 2973 The test is done here, rather than somewhere else, because the 2974 start address is only set just before the final link commences. 2975 2976 Note - if the user deliberately sets a start address of 0, the 2977 flag will not be set. */ 2978 if (bfd_get_start_address (output_bfd) != 0) 2979 elf_elfheader (output_bfd)->e_flags |= EF_ARM_HASENTRY; 2980 2981 dynobj = elf_hash_table (info)->dynobj; 2982 if (dynobj) 2983 { 2984 sgot = bfd_get_section_by_name (dynobj, ".got"); 2985 splt = bfd_get_section_by_name (dynobj, ".plt"); 2986 } 2987 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 2988 sym_hashes = elf_sym_hashes (input_bfd); 2989 local_got_offsets = elf_local_got_offsets (input_bfd); 2990 r_symndx = ELF32_R_SYM (rel->r_info); 2991 2992 if (globals->use_rel) 2993 { 2994 addend = bfd_get_32 (input_bfd, hit_data) & howto->src_mask; 2995 2996 if (addend & ((howto->src_mask + 1) >> 1)) 2997 { 2998 signed_addend = -1; 2999 signed_addend &= ~ howto->src_mask; 3000 signed_addend |= addend; 3001 } 3002 else 3003 signed_addend = addend; 3004 } 3005 else 3006 addend = signed_addend = rel->r_addend; 3007 3008 switch (r_type) 3009 { 3010 case R_ARM_NONE: 3011 /* We don't need to find a value for this symbol. It's just a 3012 marker. */ 3013 *unresolved_reloc_p = FALSE; 3014 return bfd_reloc_ok; 3015 3016 case R_ARM_ABS12: 3017 if (!globals->vxworks_p) 3018 return elf32_arm_abs12_reloc (input_bfd, hit_data, value + addend); 3019 3020 case R_ARM_PC24: 3021 case R_ARM_ABS32: 3022 case R_ARM_REL32: 3023 case R_ARM_CALL: 3024 case R_ARM_JUMP24: 3025 case R_ARM_XPC25: 3026 case R_ARM_PREL31: 3027 case R_ARM_PLT32: 3028 /* r_symndx will be zero only for relocs against symbols 3029 from removed linkonce sections, or sections discarded by 3030 a linker script. */ 3031 if (r_symndx == 0) 3032 return bfd_reloc_ok; 3033 3034 /* Handle relocations which should use the PLT entry. ABS32/REL32 3035 will use the symbol's value, which may point to a PLT entry, but we 3036 don't need to handle that here. If we created a PLT entry, all 3037 branches in this object should go to it. */ 3038 if ((r_type != R_ARM_ABS32 && r_type != R_ARM_REL32) 3039 && h != NULL 3040 && splt != NULL 3041 && h->plt.offset != (bfd_vma) -1) 3042 { 3043 /* If we've created a .plt section, and assigned a PLT entry to 3044 this function, it should not be known to bind locally. If 3045 it were, we would have cleared the PLT entry. */ 3046 BFD_ASSERT (!SYMBOL_CALLS_LOCAL (info, h)); 3047 3048 value = (splt->output_section->vma 3049 + splt->output_offset 3050 + h->plt.offset); 3051 *unresolved_reloc_p = FALSE; 3052 return _bfd_final_link_relocate (howto, input_bfd, input_section, 3053 contents, rel->r_offset, value, 3054 rel->r_addend); 3055 } 3056 3057 /* When generating a shared object or relocatable executable, these 3058 relocations are copied into the output file to be resolved at 3059 run time. */ 3060 if ((info->shared || globals->root.is_relocatable_executable) 3061 && (input_section->flags & SEC_ALLOC) 3062 && (r_type != R_ARM_REL32 3063 || !SYMBOL_CALLS_LOCAL (info, h)) 3064 && (h == NULL 3065 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 3066 || h->root.type != bfd_link_hash_undefweak) 3067 && r_type != R_ARM_PC24 3068 && r_type != R_ARM_CALL 3069 && r_type != R_ARM_JUMP24 3070 && r_type != R_ARM_PREL31 3071 && r_type != R_ARM_PLT32) 3072 { 3073 Elf_Internal_Rela outrel; 3074 bfd_byte *loc; 3075 bfd_boolean skip, relocate; 3076 3077 *unresolved_reloc_p = FALSE; 3078 3079 if (sreloc == NULL) 3080 { 3081 const char * name; 3082 3083 name = (bfd_elf_string_from_elf_section 3084 (input_bfd, 3085 elf_elfheader (input_bfd)->e_shstrndx, 3086 elf_section_data (input_section)->rel_hdr.sh_name)); 3087 if (name == NULL) 3088 return bfd_reloc_notsupported; 3089 3090 BFD_ASSERT (reloc_section_p (globals, name, input_section)); 3091 3092 sreloc = bfd_get_section_by_name (dynobj, name); 3093 BFD_ASSERT (sreloc != NULL); 3094 } 3095 3096 skip = FALSE; 3097 relocate = FALSE; 3098 3099 outrel.r_addend = addend; 3100 outrel.r_offset = 3101 _bfd_elf_section_offset (output_bfd, info, input_section, 3102 rel->r_offset); 3103 if (outrel.r_offset == (bfd_vma) -1) 3104 skip = TRUE; 3105 else if (outrel.r_offset == (bfd_vma) -2) 3106 skip = TRUE, relocate = TRUE; 3107 outrel.r_offset += (input_section->output_section->vma 3108 + input_section->output_offset); 3109 3110 if (skip) 3111 memset (&outrel, 0, sizeof outrel); 3112 else if (h != NULL 3113 && h->dynindx != -1 3114 && (!info->shared 3115 || !info->symbolic 3116 || !h->def_regular)) 3117 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 3118 else 3119 { 3120 int symbol; 3121 3122 /* This symbol is local, or marked to become local. */ 3123 if (sym_flags == STT_ARM_TFUNC) 3124 value |= 1; 3125 if (globals->symbian_p) 3126 { 3127 /* On Symbian OS, the data segment and text segement 3128 can be relocated independently. Therefore, we 3129 must indicate the segment to which this 3130 relocation is relative. The BPABI allows us to 3131 use any symbol in the right segment; we just use 3132 the section symbol as it is convenient. (We 3133 cannot use the symbol given by "h" directly as it 3134 will not appear in the dynamic symbol table.) */ 3135 if (sym_sec) 3136 symbol = elf_section_data (sym_sec->output_section)->dynindx; 3137 else 3138 symbol = elf_section_data (input_section->output_section)->dynindx; 3139 BFD_ASSERT (symbol != 0); 3140 } 3141 else 3142 /* On SVR4-ish systems, the dynamic loader cannot 3143 relocate the text and data segments independently, 3144 so the symbol does not matter. */ 3145 symbol = 0; 3146 outrel.r_info = ELF32_R_INFO (symbol, R_ARM_RELATIVE); 3147 if (globals->use_rel) 3148 relocate = TRUE; 3149 else 3150 outrel.r_addend += value; 3151 } 3152 3153 loc = sreloc->contents; 3154 loc += sreloc->reloc_count++ * RELOC_SIZE (globals); 3155 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 3156 3157 /* If this reloc is against an external symbol, we do not want to 3158 fiddle with the addend. Otherwise, we need to include the symbol 3159 value so that it becomes an addend for the dynamic reloc. */ 3160 if (! relocate) 3161 return bfd_reloc_ok; 3162 3163 return _bfd_final_link_relocate (howto, input_bfd, input_section, 3164 contents, rel->r_offset, value, 3165 (bfd_vma) 0); 3166 } 3167 else switch (r_type) 3168 { 3169 case R_ARM_ABS12: 3170 return elf32_arm_abs12_reloc (input_bfd, hit_data, value + addend); 3171 3172 case R_ARM_XPC25: /* Arm BLX instruction. */ 3173 case R_ARM_CALL: 3174 case R_ARM_JUMP24: 3175 case R_ARM_PC24: /* Arm B/BL instruction */ 3176 case R_ARM_PLT32: 3177 if (r_type == R_ARM_XPC25) 3178 { 3179 /* Check for Arm calling Arm function. */ 3180 /* FIXME: Should we translate the instruction into a BL 3181 instruction instead ? */ 3182 if (sym_flags != STT_ARM_TFUNC) 3183 (*_bfd_error_handler) 3184 (_("\%B: Warning: Arm BLX instruction targets Arm function '%s'."), 3185 input_bfd, 3186 h ? h->root.root.string : "(local)"); 3187 } 3188 else if (r_type != R_ARM_CALL || !globals->use_blx) 3189 { 3190 /* Check for Arm calling Thumb function. */ 3191 if (sym_flags == STT_ARM_TFUNC) 3192 { 3193 elf32_arm_to_thumb_stub (info, sym_name, input_bfd, 3194 output_bfd, input_section, 3195 hit_data, sym_sec, rel->r_offset, 3196 signed_addend, value); 3197 return bfd_reloc_ok; 3198 } 3199 } 3200 3201 /* The ARM ELF ABI says that this reloc is computed as: S - P + A 3202 where: 3203 S is the address of the symbol in the relocation. 3204 P is address of the instruction being relocated. 3205 A is the addend (extracted from the instruction) in bytes. 3206 3207 S is held in 'value'. 3208 P is the base address of the section containing the 3209 instruction plus the offset of the reloc into that 3210 section, ie: 3211 (input_section->output_section->vma + 3212 input_section->output_offset + 3213 rel->r_offset). 3214 A is the addend, converted into bytes, ie: 3215 (signed_addend * 4) 3216 3217 Note: None of these operations have knowledge of the pipeline 3218 size of the processor, thus it is up to the assembler to 3219 encode this information into the addend. */ 3220 value -= (input_section->output_section->vma 3221 + input_section->output_offset); 3222 value -= rel->r_offset; 3223 if (globals->use_rel) 3224 value += (signed_addend << howto->size); 3225 else 3226 /* RELA addends do not have to be adjusted by howto->size. */ 3227 value += signed_addend; 3228 3229 signed_addend = value; 3230 signed_addend >>= howto->rightshift; 3231 3232 /* It is not an error for an undefined weak reference to be 3233 out of range. Any program that branches to such a symbol 3234 is going to crash anyway, so there is no point worrying 3235 about getting the destination exactly right. */ 3236 if (! h || h->root.type != bfd_link_hash_undefweak) 3237 { 3238 /* Perform a signed range check. */ 3239 if ( signed_addend > ((bfd_signed_vma) (howto->dst_mask >> 1)) 3240 || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1))) 3241 return bfd_reloc_overflow; 3242 } 3243 3244 addend = (value & 2); 3245 3246 value = (signed_addend & howto->dst_mask) 3247 | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)); 3248 3249 /* Set the H bit in the BLX instruction. */ 3250 if (sym_flags == STT_ARM_TFUNC) 3251 { 3252 if (addend) 3253 value |= (1 << 24); 3254 else 3255 value &= ~(bfd_vma)(1 << 24); 3256 } 3257 if (r_type == R_ARM_CALL) 3258 { 3259 /* Select the correct instruction (BL or BLX). */ 3260 if (sym_flags == STT_ARM_TFUNC) 3261 value |= (1 << 28); 3262 else 3263 { 3264 value &= ~(bfd_vma)(1 << 28); 3265 value |= (1 << 24); 3266 } 3267 } 3268 break; 3269 3270 case R_ARM_ABS32: 3271 value += addend; 3272 if (sym_flags == STT_ARM_TFUNC) 3273 value |= 1; 3274 break; 3275 3276 case R_ARM_REL32: 3277 value += addend; 3278 if (sym_flags == STT_ARM_TFUNC) 3279 value |= 1; 3280 value -= (input_section->output_section->vma 3281 + input_section->output_offset + rel->r_offset); 3282 break; 3283 3284 case R_ARM_PREL31: 3285 value -= (input_section->output_section->vma 3286 + input_section->output_offset + rel->r_offset); 3287 value += signed_addend; 3288 if (! h || h->root.type != bfd_link_hash_undefweak) 3289 { 3290 /* Check for overflow */ 3291 if ((value ^ (value >> 1)) & (1 << 30)) 3292 return bfd_reloc_overflow; 3293 } 3294 value &= 0x7fffffff; 3295 value |= (bfd_get_32 (input_bfd, hit_data) & 0x80000000); 3296 if (sym_flags == STT_ARM_TFUNC) 3297 value |= 1; 3298 break; 3299 } 3300 3301 bfd_put_32 (input_bfd, value, hit_data); 3302 return bfd_reloc_ok; 3303 3304 case R_ARM_ABS8: 3305 value += addend; 3306 if ((long) value > 0x7f || (long) value < -0x80) 3307 return bfd_reloc_overflow; 3308 3309 bfd_put_8 (input_bfd, value, hit_data); 3310 return bfd_reloc_ok; 3311 3312 case R_ARM_ABS16: 3313 value += addend; 3314 3315 if ((long) value > 0x7fff || (long) value < -0x8000) 3316 return bfd_reloc_overflow; 3317 3318 bfd_put_16 (input_bfd, value, hit_data); 3319 return bfd_reloc_ok; 3320 3321 case R_ARM_THM_ABS5: 3322 /* Support ldr and str instructions for the thumb. */ 3323 if (globals->use_rel) 3324 { 3325 /* Need to refetch addend. */ 3326 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; 3327 /* ??? Need to determine shift amount from operand size. */ 3328 addend >>= howto->rightshift; 3329 } 3330 value += addend; 3331 3332 /* ??? Isn't value unsigned? */ 3333 if ((long) value > 0x1f || (long) value < -0x10) 3334 return bfd_reloc_overflow; 3335 3336 /* ??? Value needs to be properly shifted into place first. */ 3337 value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f; 3338 bfd_put_16 (input_bfd, value, hit_data); 3339 return bfd_reloc_ok; 3340 3341 case R_ARM_THM_XPC22: 3342 case R_ARM_THM_CALL: 3343 /* Thumb BL (branch long instruction). */ 3344 { 3345 bfd_vma relocation; 3346 bfd_boolean overflow = FALSE; 3347 bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); 3348 bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); 3349 bfd_signed_vma reloc_signed_max = ((1 << (howto->bitsize - 1)) - 1) >> howto->rightshift; 3350 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; 3351 bfd_vma check; 3352 bfd_signed_vma signed_check; 3353 3354 /* Need to refetch the addend and squish the two 11 bit pieces 3355 together. */ 3356 if (globals->use_rel) 3357 { 3358 bfd_vma upper = upper_insn & 0x7ff; 3359 bfd_vma lower = lower_insn & 0x7ff; 3360 upper = (upper ^ 0x400) - 0x400; /* Sign extend. */ 3361 addend = (upper << 12) | (lower << 1); 3362 signed_addend = addend; 3363 } 3364 3365 if (r_type == R_ARM_THM_XPC22) 3366 { 3367 /* Check for Thumb to Thumb call. */ 3368 /* FIXME: Should we translate the instruction into a BL 3369 instruction instead ? */ 3370 if (sym_flags == STT_ARM_TFUNC) 3371 (*_bfd_error_handler) 3372 (_("%B: Warning: Thumb BLX instruction targets thumb function '%s'."), 3373 input_bfd, 3374 h ? h->root.root.string : "(local)"); 3375 } 3376 else 3377 { 3378 /* If it is not a call to Thumb, assume call to Arm. 3379 If it is a call relative to a section name, then it is not a 3380 function call at all, but rather a long jump. Calls through 3381 the PLT do not require stubs. */ 3382 if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION 3383 && (h == NULL || splt == NULL 3384 || h->plt.offset == (bfd_vma) -1)) 3385 { 3386 if (globals->use_blx) 3387 { 3388 /* Convert BL to BLX. */ 3389 lower_insn = (lower_insn & ~0x1000) | 0x0800; 3390 } 3391 else if (elf32_thumb_to_arm_stub 3392 (info, sym_name, input_bfd, output_bfd, input_section, 3393 hit_data, sym_sec, rel->r_offset, signed_addend, value)) 3394 return bfd_reloc_ok; 3395 else 3396 return bfd_reloc_dangerous; 3397 } 3398 else if (sym_flags == STT_ARM_TFUNC && globals->use_blx) 3399 { 3400 /* Make sure this is a BL. */ 3401 lower_insn |= 0x1800; 3402 } 3403 } 3404 3405 /* Handle calls via the PLT. */ 3406 if (h != NULL && splt != NULL && h->plt.offset != (bfd_vma) -1) 3407 { 3408 value = (splt->output_section->vma 3409 + splt->output_offset 3410 + h->plt.offset); 3411 if (globals->use_blx) 3412 { 3413 /* If the Thumb BLX instruction is available, convert the 3414 BL to a BLX instruction to call the ARM-mode PLT entry. */ 3415 lower_insn = (lower_insn & ~0x1000) | 0x0800; 3416 } 3417 else 3418 /* Target the Thumb stub before the ARM PLT entry. */ 3419 value -= PLT_THUMB_STUB_SIZE; 3420 *unresolved_reloc_p = FALSE; 3421 } 3422 3423 relocation = value + signed_addend; 3424 3425 relocation -= (input_section->output_section->vma 3426 + input_section->output_offset 3427 + rel->r_offset); 3428 3429 check = relocation >> howto->rightshift; 3430 3431 /* If this is a signed value, the rightshift just dropped 3432 leading 1 bits (assuming twos complement). */ 3433 if ((bfd_signed_vma) relocation >= 0) 3434 signed_check = check; 3435 else 3436 signed_check = check | ~((bfd_vma) -1 >> howto->rightshift); 3437 3438 /* Assumes two's complement. */ 3439 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) 3440 overflow = TRUE; 3441 3442 if ((lower_insn & 0x1800) == 0x0800) 3443 /* For a BLX instruction, make sure that the relocation is rounded up 3444 to a word boundary. This follows the semantics of the instruction 3445 which specifies that bit 1 of the target address will come from bit 3446 1 of the base address. */ 3447 relocation = (relocation + 2) & ~ 3; 3448 3449 /* Put RELOCATION back into the insn. */ 3450 upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff); 3451 lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff); 3452 3453 /* Put the relocated value back in the object file: */ 3454 bfd_put_16 (input_bfd, upper_insn, hit_data); 3455 bfd_put_16 (input_bfd, lower_insn, hit_data + 2); 3456 3457 return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); 3458 } 3459 break; 3460 3461 case R_ARM_THM_JUMP24: 3462 /* Thumb32 unconditional branch instruction. */ 3463 { 3464 bfd_vma relocation; 3465 bfd_boolean overflow = FALSE; 3466 bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); 3467 bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); 3468 bfd_signed_vma reloc_signed_max = ((1 << (howto->bitsize - 1)) - 1) >> howto->rightshift; 3469 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; 3470 bfd_vma check; 3471 bfd_signed_vma signed_check; 3472 3473 /* Need to refetch the addend, reconstruct the top three bits, and glue the 3474 two pieces together. */ 3475 if (globals->use_rel) 3476 { 3477 bfd_vma S = (upper_insn & 0x0400) >> 10; 3478 bfd_vma hi = (upper_insn & 0x03ff); 3479 bfd_vma I1 = (lower_insn & 0x2000) >> 13; 3480 bfd_vma I2 = (lower_insn & 0x0800) >> 11; 3481 bfd_vma lo = (lower_insn & 0x07ff); 3482 3483 I1 = !(I1 ^ S); 3484 I2 = !(I2 ^ S); 3485 S = !S; 3486 3487 signed_addend = (S << 24) | (I1 << 23) | (I2 << 22) | (hi << 12) | (lo << 1); 3488 signed_addend -= (1 << 24); /* Sign extend. */ 3489 } 3490 3491 /* ??? Should handle interworking? GCC might someday try to 3492 use this for tail calls. */ 3493 3494 relocation = value + signed_addend; 3495 relocation -= (input_section->output_section->vma 3496 + input_section->output_offset 3497 + rel->r_offset); 3498 3499 check = relocation >> howto->rightshift; 3500 3501 /* If this is a signed value, the rightshift just dropped 3502 leading 1 bits (assuming twos complement). */ 3503 if ((bfd_signed_vma) relocation >= 0) 3504 signed_check = check; 3505 else 3506 signed_check = check | ~((bfd_vma) -1 >> howto->rightshift); 3507 3508 /* Assumes two's complement. */ 3509 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) 3510 overflow = TRUE; 3511 3512 /* Put RELOCATION back into the insn. */ 3513 { 3514 bfd_vma S = (relocation & 0x01000000) >> 24; 3515 bfd_vma I1 = (relocation & 0x00800000) >> 23; 3516 bfd_vma I2 = (relocation & 0x00400000) >> 22; 3517 bfd_vma hi = (relocation & 0x003ff000) >> 12; 3518 bfd_vma lo = (relocation & 0x00000ffe) >> 1; 3519 3520 I1 = !(I1 ^ S); 3521 I2 = !(I2 ^ S); 3522 3523 upper_insn = (upper_insn & (bfd_vma) 0xf800) | (S << 10) | hi; 3524 lower_insn = (lower_insn & (bfd_vma) 0xd000) | (I1 << 13) | (I2 << 11) | lo; 3525 } 3526 3527 /* Put the relocated value back in the object file: */ 3528 bfd_put_16 (input_bfd, upper_insn, hit_data); 3529 bfd_put_16 (input_bfd, lower_insn, hit_data + 2); 3530 3531 return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); 3532 } 3533 3534 case R_ARM_THM_JUMP19: 3535 /* Thumb32 conditional branch instruction. */ 3536 { 3537 bfd_vma relocation; 3538 bfd_boolean overflow = FALSE; 3539 bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); 3540 bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); 3541 bfd_signed_vma reloc_signed_max = ((1 << (howto->bitsize - 1)) - 1) >> howto->rightshift; 3542 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; 3543 bfd_vma check; 3544 bfd_signed_vma signed_check; 3545 3546 /* Need to refetch the addend, reconstruct the top three bits, 3547 and squish the two 11 bit pieces together. */ 3548 if (globals->use_rel) 3549 { 3550 bfd_vma S = (upper_insn & 0x0400) >> 10; 3551 bfd_vma upper = (upper_insn & 0x001f); 3552 bfd_vma J1 = (lower_insn & 0x2000) >> 13; 3553 bfd_vma J2 = (lower_insn & 0x0800) >> 11; 3554 bfd_vma lower = (lower_insn & 0x07ff); 3555 3556 upper |= J2 << 6; 3557 upper |= J1 << 7; 3558 upper |= ~S << 8; 3559 upper -= 0x0100; /* Sign extend. */ 3560 3561 addend = (upper << 12) | (lower << 1); 3562 signed_addend = addend; 3563 } 3564 3565 /* ??? Should handle interworking? GCC might someday try to 3566 use this for tail calls. */ 3567 3568 relocation = value + signed_addend; 3569 relocation -= (input_section->output_section->vma 3570 + input_section->output_offset 3571 + rel->r_offset); 3572 3573 check = relocation >> howto->rightshift; 3574 3575 /* If this is a signed value, the rightshift just dropped 3576 leading 1 bits (assuming twos complement). */ 3577 if ((bfd_signed_vma) relocation >= 0) 3578 signed_check = check; 3579 else 3580 signed_check = check | ~((bfd_vma) -1 >> howto->rightshift); 3581 3582 /* Assumes two's complement. */ 3583 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) 3584 overflow = TRUE; 3585 3586 /* Put RELOCATION back into the insn. */ 3587 { 3588 bfd_vma S = (relocation & 0x00100000) >> 20; 3589 bfd_vma J2 = (relocation & 0x00080000) >> 19; 3590 bfd_vma J1 = (relocation & 0x00040000) >> 18; 3591 bfd_vma hi = (relocation & 0x0003f000) >> 12; 3592 bfd_vma lo = (relocation & 0x00000ffe) >> 1; 3593 3594 upper_insn = (upper_insn & 0xfb30) | (S << 10) | hi; 3595 lower_insn = (lower_insn & 0xd000) | (J1 << 13) | (J2 << 11) | lo; 3596 } 3597 3598 /* Put the relocated value back in the object file: */ 3599 bfd_put_16 (input_bfd, upper_insn, hit_data); 3600 bfd_put_16 (input_bfd, lower_insn, hit_data + 2); 3601 3602 return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); 3603 } 3604 3605 case R_ARM_THM_JUMP11: 3606 case R_ARM_THM_JUMP8: 3607 case R_ARM_THM_JUMP6: 3608 /* Thumb B (branch) instruction). */ 3609 { 3610 bfd_signed_vma relocation; 3611 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; 3612 bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; 3613 bfd_signed_vma signed_check; 3614 3615 /* CZB cannot jump backward. */ 3616 if (r_type == R_ARM_THM_JUMP6) 3617 reloc_signed_min = 0; 3618 3619 if (globals->use_rel) 3620 { 3621 /* Need to refetch addend. */ 3622 addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; 3623 if (addend & ((howto->src_mask + 1) >> 1)) 3624 { 3625 signed_addend = -1; 3626 signed_addend &= ~ howto->src_mask; 3627 signed_addend |= addend; 3628 } 3629 else 3630 signed_addend = addend; 3631 /* The value in the insn has been right shifted. We need to 3632 undo this, so that we can perform the address calculation 3633 in terms of bytes. */ 3634 signed_addend <<= howto->rightshift; 3635 } 3636 relocation = value + signed_addend; 3637 3638 relocation -= (input_section->output_section->vma 3639 + input_section->output_offset 3640 + rel->r_offset); 3641 3642 relocation >>= howto->rightshift; 3643 signed_check = relocation; 3644 3645 if (r_type == R_ARM_THM_JUMP6) 3646 relocation = ((relocation & 0x0020) << 4) | ((relocation & 0x001f) << 3); 3647 else 3648 relocation &= howto->dst_mask; 3649 relocation |= (bfd_get_16 (input_bfd, hit_data) & (~ howto->dst_mask)); 3650 3651 bfd_put_16 (input_bfd, relocation, hit_data); 3652 3653 /* Assumes two's complement. */ 3654 if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) 3655 return bfd_reloc_overflow; 3656 3657 return bfd_reloc_ok; 3658 } 3659 3660 case R_ARM_ALU_PCREL7_0: 3661 case R_ARM_ALU_PCREL15_8: 3662 case R_ARM_ALU_PCREL23_15: 3663 { 3664 bfd_vma insn; 3665 bfd_vma relocation; 3666 3667 insn = bfd_get_32 (input_bfd, hit_data); 3668 if (globals->use_rel) 3669 { 3670 /* Extract the addend. */ 3671 addend = (insn & 0xff) << ((insn & 0xf00) >> 7); 3672 signed_addend = addend; 3673 } 3674 relocation = value + signed_addend; 3675 3676 relocation -= (input_section->output_section->vma 3677 + input_section->output_offset 3678 + rel->r_offset); 3679 insn = (insn & ~0xfff) 3680 | ((howto->bitpos << 7) & 0xf00) 3681 | ((relocation >> howto->bitpos) & 0xff); 3682 bfd_put_32 (input_bfd, value, hit_data); 3683 } 3684 return bfd_reloc_ok; 3685 3686 case R_ARM_GNU_VTINHERIT: 3687 case R_ARM_GNU_VTENTRY: 3688 return bfd_reloc_ok; 3689 3690 case R_ARM_GOTOFF32: 3691 /* Relocation is relative to the start of the 3692 global offset table. */ 3693 3694 BFD_ASSERT (sgot != NULL); 3695 if (sgot == NULL) 3696 return bfd_reloc_notsupported; 3697 3698 /* If we are addressing a Thumb function, we need to adjust the 3699 address by one, so that attempts to call the function pointer will 3700 correctly interpret it as Thumb code. */ 3701 if (sym_flags == STT_ARM_TFUNC) 3702 value += 1; 3703 3704 /* Note that sgot->output_offset is not involved in this 3705 calculation. We always want the start of .got. If we 3706 define _GLOBAL_OFFSET_TABLE in a different way, as is 3707 permitted by the ABI, we might have to change this 3708 calculation. */ 3709 value -= sgot->output_section->vma; 3710 return _bfd_final_link_relocate (howto, input_bfd, input_section, 3711 contents, rel->r_offset, value, 3712 rel->r_addend); 3713 3714 case R_ARM_GOTPC: 3715 /* Use global offset table as symbol value. */ 3716 BFD_ASSERT (sgot != NULL); 3717 3718 if (sgot == NULL) 3719 return bfd_reloc_notsupported; 3720 3721 *unresolved_reloc_p = FALSE; 3722 value = sgot->output_section->vma; 3723 return _bfd_final_link_relocate (howto, input_bfd, input_section, 3724 contents, rel->r_offset, value, 3725 rel->r_addend); 3726 3727 case R_ARM_GOT32: 3728 case R_ARM_GOT_PREL: 3729 /* Relocation is to the entry for this symbol in the 3730 global offset table. */ 3731 if (sgot == NULL) 3732 return bfd_reloc_notsupported; 3733 3734 if (h != NULL) 3735 { 3736 bfd_vma off; 3737 bfd_boolean dyn; 3738 3739 off = h->got.offset; 3740 BFD_ASSERT (off != (bfd_vma) -1); 3741 dyn = globals->root.dynamic_sections_created; 3742 3743 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 3744 || (info->shared 3745 && SYMBOL_REFERENCES_LOCAL (info, h)) 3746 || (ELF_ST_VISIBILITY (h->other) 3747 && h->root.type == bfd_link_hash_undefweak)) 3748 { 3749 /* This is actually a static link, or it is a -Bsymbolic link 3750 and the symbol is defined locally. We must initialize this 3751 entry in the global offset table. Since the offset must 3752 always be a multiple of 4, we use the least significant bit 3753 to record whether we have initialized it already. 3754 3755 When doing a dynamic link, we create a .rel(a).got relocation 3756 entry to initialize the value. This is done in the 3757 finish_dynamic_symbol routine. */ 3758 if ((off & 1) != 0) 3759 off &= ~1; 3760 else 3761 { 3762 /* If we are addressing a Thumb function, we need to 3763 adjust the address by one, so that attempts to 3764 call the function pointer will correctly 3765 interpret it as Thumb code. */ 3766 if (sym_flags == STT_ARM_TFUNC) 3767 value |= 1; 3768 3769 bfd_put_32 (output_bfd, value, sgot->contents + off); 3770 h->got.offset |= 1; 3771 } 3772 } 3773 else 3774 *unresolved_reloc_p = FALSE; 3775 3776 value = sgot->output_offset + off; 3777 } 3778 else 3779 { 3780 bfd_vma off; 3781 3782 BFD_ASSERT (local_got_offsets != NULL && 3783 local_got_offsets[r_symndx] != (bfd_vma) -1); 3784 3785 off = local_got_offsets[r_symndx]; 3786 3787 /* The offset must always be a multiple of 4. We use the 3788 least significant bit to record whether we have already 3789 generated the necessary reloc. */ 3790 if ((off & 1) != 0) 3791 off &= ~1; 3792 else 3793 { 3794 /* If we are addressing a Thumb function, we need to 3795 adjust the address by one, so that attempts to 3796 call the function pointer will correctly 3797 interpret it as Thumb code. */ 3798 if (sym_flags == STT_ARM_TFUNC) 3799 value |= 1; 3800 3801 if (globals->use_rel) 3802 bfd_put_32 (output_bfd, value, sgot->contents + off); 3803 3804 if (info->shared) 3805 { 3806 asection * srelgot; 3807 Elf_Internal_Rela outrel; 3808 bfd_byte *loc; 3809 3810 srelgot = (bfd_get_section_by_name 3811 (dynobj, RELOC_SECTION (globals, ".got"))); 3812 BFD_ASSERT (srelgot != NULL); 3813 3814 outrel.r_addend = addend + value; 3815 outrel.r_offset = (sgot->output_section->vma 3816 + sgot->output_offset 3817 + off); 3818 outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); 3819 loc = srelgot->contents; 3820 loc += srelgot->reloc_count++ * RELOC_SIZE (globals); 3821 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 3822 } 3823 3824 local_got_offsets[r_symndx] |= 1; 3825 } 3826 3827 value = sgot->output_offset + off; 3828 } 3829 if (r_type != R_ARM_GOT32) 3830 value += sgot->output_section->vma; 3831 3832 return _bfd_final_link_relocate (howto, input_bfd, input_section, 3833 contents, rel->r_offset, value, 3834 rel->r_addend); 3835 3836 case R_ARM_TLS_LDO32: 3837 value = value - dtpoff_base (info); 3838 3839 return _bfd_final_link_relocate (howto, input_bfd, input_section, 3840 contents, rel->r_offset, value, 3841 rel->r_addend); 3842 3843 case R_ARM_TLS_LDM32: 3844 { 3845 bfd_vma off; 3846 3847 if (globals->sgot == NULL) 3848 abort (); 3849 3850 off = globals->tls_ldm_got.offset; 3851 3852 if ((off & 1) != 0) 3853 off &= ~1; 3854 else 3855 { 3856 /* If we don't know the module number, create a relocation 3857 for it. */ 3858 if (info->shared) 3859 { 3860 Elf_Internal_Rela outrel; 3861 bfd_byte *loc; 3862 3863 if (globals->srelgot == NULL) 3864 abort (); 3865 3866 outrel.r_addend = 0; 3867 outrel.r_offset = (globals->sgot->output_section->vma 3868 + globals->sgot->output_offset + off); 3869 outrel.r_info = ELF32_R_INFO (0, R_ARM_TLS_DTPMOD32); 3870 3871 if (globals->use_rel) 3872 bfd_put_32 (output_bfd, outrel.r_addend, 3873 globals->sgot->contents + off); 3874 3875 loc = globals->srelgot->contents; 3876 loc += globals->srelgot->reloc_count++ * RELOC_SIZE (globals); 3877 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 3878 } 3879 else 3880 bfd_put_32 (output_bfd, 1, globals->sgot->contents + off); 3881 3882 globals->tls_ldm_got.offset |= 1; 3883 } 3884 3885 value = globals->sgot->output_section->vma + globals->sgot->output_offset + off 3886 - (input_section->output_section->vma + input_section->output_offset + rel->r_offset); 3887 3888 return _bfd_final_link_relocate (howto, input_bfd, input_section, 3889 contents, rel->r_offset, value, 3890 rel->r_addend); 3891 } 3892 3893 case R_ARM_TLS_GD32: 3894 case R_ARM_TLS_IE32: 3895 { 3896 bfd_vma off; 3897 int indx; 3898 char tls_type; 3899 3900 if (globals->sgot == NULL) 3901 abort (); 3902 3903 indx = 0; 3904 if (h != NULL) 3905 { 3906 bfd_boolean dyn; 3907 dyn = globals->root.dynamic_sections_created; 3908 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 3909 && (!info->shared 3910 || !SYMBOL_REFERENCES_LOCAL (info, h))) 3911 { 3912 *unresolved_reloc_p = FALSE; 3913 indx = h->dynindx; 3914 } 3915 off = h->got.offset; 3916 tls_type = ((struct elf32_arm_link_hash_entry *) h)->tls_type; 3917 } 3918 else 3919 { 3920 if (local_got_offsets == NULL) 3921 abort (); 3922 off = local_got_offsets[r_symndx]; 3923 tls_type = elf32_arm_local_got_tls_type (input_bfd)[r_symndx]; 3924 } 3925 3926 if (tls_type == GOT_UNKNOWN) 3927 abort (); 3928 3929 if ((off & 1) != 0) 3930 off &= ~1; 3931 else 3932 { 3933 bfd_boolean need_relocs = FALSE; 3934 Elf_Internal_Rela outrel; 3935 bfd_byte *loc = NULL; 3936 int cur_off = off; 3937 3938 /* The GOT entries have not been initialized yet. Do it 3939 now, and emit any relocations. If both an IE GOT and a 3940 GD GOT are necessary, we emit the GD first. */ 3941 3942 if ((info->shared || indx != 0) 3943 && (h == NULL 3944 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 3945 || h->root.type != bfd_link_hash_undefweak)) 3946 { 3947 need_relocs = TRUE; 3948 if (globals->srelgot == NULL) 3949 abort (); 3950 loc = globals->srelgot->contents; 3951 loc += globals->srelgot->reloc_count * RELOC_SIZE (globals); 3952 } 3953 3954 if (tls_type & GOT_TLS_GD) 3955 { 3956 if (need_relocs) 3957 { 3958 outrel.r_addend = 0; 3959 outrel.r_offset = (globals->sgot->output_section->vma 3960 + globals->sgot->output_offset 3961 + cur_off); 3962 outrel.r_info = ELF32_R_INFO (indx, R_ARM_TLS_DTPMOD32); 3963 3964 if (globals->use_rel) 3965 bfd_put_32 (output_bfd, outrel.r_addend, 3966 globals->sgot->contents + cur_off); 3967 3968 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 3969 globals->srelgot->reloc_count++; 3970 loc += RELOC_SIZE (globals); 3971 3972 if (indx == 0) 3973 bfd_put_32 (output_bfd, value - dtpoff_base (info), 3974 globals->sgot->contents + cur_off + 4); 3975 else 3976 { 3977 outrel.r_addend = 0; 3978 outrel.r_info = ELF32_R_INFO (indx, 3979 R_ARM_TLS_DTPOFF32); 3980 outrel.r_offset += 4; 3981 3982 if (globals->use_rel) 3983 bfd_put_32 (output_bfd, outrel.r_addend, 3984 globals->sgot->contents + cur_off + 4); 3985 3986 3987 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 3988 globals->srelgot->reloc_count++; 3989 loc += RELOC_SIZE (globals); 3990 } 3991 } 3992 else 3993 { 3994 /* If we are not emitting relocations for a 3995 general dynamic reference, then we must be in a 3996 static link or an executable link with the 3997 symbol binding locally. Mark it as belonging 3998 to module 1, the executable. */ 3999 bfd_put_32 (output_bfd, 1, 4000 globals->sgot->contents + cur_off); 4001 bfd_put_32 (output_bfd, value - dtpoff_base (info), 4002 globals->sgot->contents + cur_off + 4); 4003 } 4004 4005 cur_off += 8; 4006 } 4007 4008 if (tls_type & GOT_TLS_IE) 4009 { 4010 if (need_relocs) 4011 { 4012 if (indx == 0) 4013 outrel.r_addend = value - dtpoff_base (info); 4014 else 4015 outrel.r_addend = 0; 4016 outrel.r_offset = (globals->sgot->output_section->vma 4017 + globals->sgot->output_offset 4018 + cur_off); 4019 outrel.r_info = ELF32_R_INFO (indx, R_ARM_TLS_TPOFF32); 4020 4021 if (globals->use_rel) 4022 bfd_put_32 (output_bfd, outrel.r_addend, 4023 globals->sgot->contents + cur_off); 4024 4025 SWAP_RELOC_OUT (globals) (output_bfd, &outrel, loc); 4026 globals->srelgot->reloc_count++; 4027 loc += RELOC_SIZE (globals); 4028 } 4029 else 4030 bfd_put_32 (output_bfd, tpoff (info, value), 4031 globals->sgot->contents + cur_off); 4032 cur_off += 4; 4033 } 4034 4035 if (h != NULL) 4036 h->got.offset |= 1; 4037 else 4038 local_got_offsets[r_symndx] |= 1; 4039 } 4040 4041 if ((tls_type & GOT_TLS_GD) && r_type != R_ARM_TLS_GD32) 4042 off += 8; 4043 value = globals->sgot->output_section->vma + globals->sgot->output_offset + off 4044 - (input_section->output_section->vma + input_section->output_offset + rel->r_offset); 4045 4046 return _bfd_final_link_relocate (howto, input_bfd, input_section, 4047 contents, rel->r_offset, value, 4048 rel->r_addend); 4049 } 4050 4051 case R_ARM_TLS_LE32: 4052 if (info->shared) 4053 { 4054 (*_bfd_error_handler) 4055 (_("%B(%A+0x%lx): R_ARM_TLS_LE32 relocation not permitted in shared object"), 4056 input_bfd, input_section, 4057 (long) rel->r_offset, howto->name); 4058 return FALSE; 4059 } 4060 else 4061 value = tpoff (info, value); 4062 4063 return _bfd_final_link_relocate (howto, input_bfd, input_section, 4064 contents, rel->r_offset, value, 4065 rel->r_addend); 4066 4067 case R_ARM_V4BX: 4068 if (globals->fix_v4bx) 4069 { 4070 bfd_vma insn = bfd_get_32 (input_bfd, hit_data); 4071 4072 /* Ensure that we have a BX instruction. */ 4073 BFD_ASSERT ((insn & 0x0ffffff0) == 0x012fff10); 4074 4075 /* Preserve Rm (lowest four bits) and the condition code 4076 (highest four bits). Other bits encode MOV PC,Rm. */ 4077 insn = (insn & 0xf000000f) | 0x01a0f000; 4078 4079 bfd_put_32 (input_bfd, insn, hit_data); 4080 } 4081 return bfd_reloc_ok; 4082 4083 default: 4084 return bfd_reloc_notsupported; 4085 } 4086} 4087 4088 4089static int 4090uleb128_size (unsigned int i) 4091{ 4092 int size; 4093 size = 1; 4094 while (i >= 0x80) 4095 { 4096 i >>= 7; 4097 size++; 4098 } 4099 return size; 4100} 4101 4102/* Return TRUE if the attribute has the default value (0/""). */ 4103static bfd_boolean 4104is_default_attr (aeabi_attribute *attr) 4105{ 4106 if ((attr->type & 1) && attr->i != 0) 4107 return FALSE; 4108 if ((attr->type & 2) && attr->s && *attr->s) 4109 return FALSE; 4110 4111 return TRUE; 4112} 4113 4114/* Return the size of a single attribute. */ 4115static bfd_vma 4116eabi_attr_size(int tag, aeabi_attribute *attr) 4117{ 4118 bfd_vma size; 4119 4120 if (is_default_attr (attr)) 4121 return 0; 4122 4123 size = uleb128_size (tag); 4124 if (attr->type & 1) 4125 size += uleb128_size (attr->i); 4126 if (attr->type & 2) 4127 size += strlen ((char *)attr->s) + 1; 4128 return size; 4129} 4130 4131/* Returns the size of the eabi object attributess section. */ 4132bfd_vma 4133elf32_arm_eabi_attr_size (bfd *abfd) 4134{ 4135 bfd_vma size; 4136 aeabi_attribute *attr; 4137 aeabi_attribute_list *list; 4138 int i; 4139 4140 attr = elf32_arm_tdata (abfd)->known_eabi_attributes; 4141 size = 16; /* 'A' <size> "aeabi" 0x1 <size>. */ 4142 for (i = 4; i < NUM_KNOWN_ATTRIBUTES; i++) 4143 size += eabi_attr_size (i, &attr[i]); 4144 4145 for (list = elf32_arm_tdata (abfd)->other_eabi_attributes; 4146 list; 4147 list = list->next) 4148 size += eabi_attr_size (list->tag, &list->attr); 4149 4150 return size; 4151} 4152 4153static bfd_byte * 4154write_uleb128 (bfd_byte *p, unsigned int val) 4155{ 4156 bfd_byte c; 4157 do 4158 { 4159 c = val & 0x7f; 4160 val >>= 7; 4161 if (val) 4162 c |= 0x80; 4163 *(p++) = c; 4164 } 4165 while (val); 4166 return p; 4167} 4168 4169/* Write attribute ATTR to butter P, and return a pointer to the following 4170 byte. */ 4171static bfd_byte * 4172write_eabi_attribute (bfd_byte *p, int tag, aeabi_attribute *attr) 4173{ 4174 /* Suppress default entries. */ 4175 if (is_default_attr(attr)) 4176 return p; 4177 4178 p = write_uleb128 (p, tag); 4179 if (attr->type & 1) 4180 p = write_uleb128 (p, attr->i); 4181 if (attr->type & 2) 4182 { 4183 int len; 4184 4185 len = strlen (attr->s) + 1; 4186 memcpy (p, attr->s, len); 4187 p += len; 4188 } 4189 4190 return p; 4191} 4192 4193/* Write the contents of the eabi attributes section to p. */ 4194void 4195elf32_arm_set_eabi_attr_contents (bfd *abfd, bfd_byte *contents, bfd_vma size) 4196{ 4197 bfd_byte *p; 4198 aeabi_attribute *attr; 4199 aeabi_attribute_list *list; 4200 int i; 4201 4202 p = contents; 4203 *(p++) = 'A'; 4204 bfd_put_32 (abfd, size - 1, p); 4205 p += 4; 4206 memcpy (p, "aeabi", 6); 4207 p += 6; 4208 *(p++) = Tag_File; 4209 bfd_put_32 (abfd, size - 11, p); 4210 p += 4; 4211 4212 attr = elf32_arm_tdata (abfd)->known_eabi_attributes; 4213 for (i = 4; i < NUM_KNOWN_ATTRIBUTES; i++) 4214 p = write_eabi_attribute (p, i, &attr[i]); 4215 4216 for (list = elf32_arm_tdata (abfd)->other_eabi_attributes; 4217 list; 4218 list = list->next) 4219 p = write_eabi_attribute (p, list->tag, &list->attr); 4220} 4221 4222/* Override final_link to handle EABI object attribute sections. */ 4223 4224static bfd_boolean 4225elf32_arm_bfd_final_link (bfd *abfd, struct bfd_link_info *info) 4226{ 4227 asection *o; 4228 struct bfd_link_order *p; 4229 asection *attr_section = NULL; 4230 bfd_byte *contents; 4231 bfd_vma size = 0; 4232 4233 /* elf32_arm_merge_private_bfd_data will already have merged the 4234 object attributes. Remove the input sections from the link, and set 4235 the contents of the output secton. */ 4236 for (o = abfd->sections; o != NULL; o = o->next) 4237 { 4238 if (strcmp (o->name, ".ARM.attributes") == 0) 4239 { 4240 for (p = o->map_head.link_order; p != NULL; p = p->next) 4241 { 4242 asection *input_section; 4243 4244 if (p->type != bfd_indirect_link_order) 4245 continue; 4246 input_section = p->u.indirect.section; 4247 /* Hack: reset the SEC_HAS_CONTENTS flag so that 4248 elf_link_input_bfd ignores this section. */ 4249 input_section->flags &= ~SEC_HAS_CONTENTS; 4250 } 4251 4252 size = elf32_arm_eabi_attr_size (abfd); 4253 bfd_set_section_size (abfd, o, size); 4254 attr_section = o; 4255 /* Skip this section later on. */ 4256 o->map_head.link_order = NULL; 4257 } 4258 } 4259 /* Invoke the ELF linker to do all the work. */ 4260 if (!bfd_elf_final_link (abfd, info)) 4261 return FALSE; 4262 4263 if (attr_section) 4264 { 4265 contents = bfd_malloc(size); 4266 if (contents == NULL) 4267 return FALSE; 4268 elf32_arm_set_eabi_attr_contents (abfd, contents, size); 4269 bfd_set_section_contents (abfd, attr_section, contents, 0, size); 4270 free (contents); 4271 } 4272 return TRUE; 4273} 4274 4275 4276/* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */ 4277static void 4278arm_add_to_rel (bfd * abfd, 4279 bfd_byte * address, 4280 reloc_howto_type * howto, 4281 bfd_signed_vma increment) 4282{ 4283 bfd_signed_vma addend; 4284 4285 if (howto->type == R_ARM_THM_CALL) 4286 { 4287 int upper_insn, lower_insn; 4288 int upper, lower; 4289 4290 upper_insn = bfd_get_16 (abfd, address); 4291 lower_insn = bfd_get_16 (abfd, address + 2); 4292 upper = upper_insn & 0x7ff; 4293 lower = lower_insn & 0x7ff; 4294 4295 addend = (upper << 12) | (lower << 1); 4296 addend += increment; 4297 addend >>= 1; 4298 4299 upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff); 4300 lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff); 4301 4302 bfd_put_16 (abfd, (bfd_vma) upper_insn, address); 4303 bfd_put_16 (abfd, (bfd_vma) lower_insn, address + 2); 4304 } 4305 else 4306 { 4307 bfd_vma contents; 4308 4309 contents = bfd_get_32 (abfd, address); 4310 4311 /* Get the (signed) value from the instruction. */ 4312 addend = contents & howto->src_mask; 4313 if (addend & ((howto->src_mask + 1) >> 1)) 4314 { 4315 bfd_signed_vma mask; 4316 4317 mask = -1; 4318 mask &= ~ howto->src_mask; 4319 addend |= mask; 4320 } 4321 4322 /* Add in the increment, (which is a byte value). */ 4323 switch (howto->type) 4324 { 4325 default: 4326 addend += increment; 4327 break; 4328 4329 case R_ARM_PC24: 4330 case R_ARM_PLT32: 4331 case R_ARM_CALL: 4332 case R_ARM_JUMP24: 4333 addend <<= howto->size; 4334 addend += increment; 4335 4336 /* Should we check for overflow here ? */ 4337 4338 /* Drop any undesired bits. */ 4339 addend >>= howto->rightshift; 4340 break; 4341 } 4342 4343 contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask); 4344 4345 bfd_put_32 (abfd, contents, address); 4346 } 4347} 4348 4349#define IS_ARM_TLS_RELOC(R_TYPE) \ 4350 ((R_TYPE) == R_ARM_TLS_GD32 \ 4351 || (R_TYPE) == R_ARM_TLS_LDO32 \ 4352 || (R_TYPE) == R_ARM_TLS_LDM32 \ 4353 || (R_TYPE) == R_ARM_TLS_DTPOFF32 \ 4354 || (R_TYPE) == R_ARM_TLS_DTPMOD32 \ 4355 || (R_TYPE) == R_ARM_TLS_TPOFF32 \ 4356 || (R_TYPE) == R_ARM_TLS_LE32 \ 4357 || (R_TYPE) == R_ARM_TLS_IE32) 4358 4359/* Relocate an ARM ELF section. */ 4360static bfd_boolean 4361elf32_arm_relocate_section (bfd * output_bfd, 4362 struct bfd_link_info * info, 4363 bfd * input_bfd, 4364 asection * input_section, 4365 bfd_byte * contents, 4366 Elf_Internal_Rela * relocs, 4367 Elf_Internal_Sym * local_syms, 4368 asection ** local_sections) 4369{ 4370 Elf_Internal_Shdr *symtab_hdr; 4371 struct elf_link_hash_entry **sym_hashes; 4372 Elf_Internal_Rela *rel; 4373 Elf_Internal_Rela *relend; 4374 const char *name; 4375 struct elf32_arm_link_hash_table * globals; 4376 4377 globals = elf32_arm_hash_table (info); 4378 if (info->relocatable && !globals->use_rel) 4379 return TRUE; 4380 4381 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 4382 sym_hashes = elf_sym_hashes (input_bfd); 4383 4384 rel = relocs; 4385 relend = relocs + input_section->reloc_count; 4386 for (; rel < relend; rel++) 4387 { 4388 int r_type; 4389 reloc_howto_type * howto; 4390 unsigned long r_symndx; 4391 Elf_Internal_Sym * sym; 4392 asection * sec; 4393 struct elf_link_hash_entry * h; 4394 bfd_vma relocation; 4395 bfd_reloc_status_type r; 4396 arelent bfd_reloc; 4397 char sym_type; 4398 bfd_boolean unresolved_reloc = FALSE; 4399 4400 r_symndx = ELF32_R_SYM (rel->r_info); 4401 r_type = ELF32_R_TYPE (rel->r_info); 4402 r_type = arm_real_reloc_type (globals, r_type); 4403 4404 if ( r_type == R_ARM_GNU_VTENTRY 4405 || r_type == R_ARM_GNU_VTINHERIT) 4406 continue; 4407 4408 bfd_reloc.howto = elf32_arm_howto_from_type (r_type); 4409 howto = bfd_reloc.howto; 4410 4411 if (info->relocatable && globals->use_rel) 4412 { 4413 /* This is a relocatable link. We don't have to change 4414 anything, unless the reloc is against a section symbol, 4415 in which case we have to adjust according to where the 4416 section symbol winds up in the output section. */ 4417 if (r_symndx < symtab_hdr->sh_info) 4418 { 4419 sym = local_syms + r_symndx; 4420 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) 4421 { 4422 sec = local_sections[r_symndx]; 4423 arm_add_to_rel (input_bfd, contents + rel->r_offset, 4424 howto, 4425 (bfd_signed_vma) (sec->output_offset 4426 + sym->st_value)); 4427 } 4428 } 4429 4430 continue; 4431 } 4432 4433 /* This is a final link. */ 4434 h = NULL; 4435 sym = NULL; 4436 sec = NULL; 4437 4438 if (r_symndx < symtab_hdr->sh_info) 4439 { 4440 sym = local_syms + r_symndx; 4441 sym_type = ELF32_ST_TYPE (sym->st_info); 4442 sec = local_sections[r_symndx]; 4443 if (globals->use_rel) 4444 { 4445 relocation = (sec->output_section->vma 4446 + sec->output_offset 4447 + sym->st_value); 4448 if ((sec->flags & SEC_MERGE) 4449 && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 4450 { 4451 asection *msec; 4452 bfd_vma addend, value; 4453 4454 if (howto->rightshift) 4455 { 4456 (*_bfd_error_handler) 4457 (_("%B(%A+0x%lx): %s relocation against SEC_MERGE section"), 4458 input_bfd, input_section, 4459 (long) rel->r_offset, howto->name); 4460 return FALSE; 4461 } 4462 4463 value = bfd_get_32 (input_bfd, contents + rel->r_offset); 4464 4465 /* Get the (signed) value from the instruction. */ 4466 addend = value & howto->src_mask; 4467 if (addend & ((howto->src_mask + 1) >> 1)) 4468 { 4469 bfd_signed_vma mask; 4470 4471 mask = -1; 4472 mask &= ~ howto->src_mask; 4473 addend |= mask; 4474 } 4475 msec = sec; 4476 addend = 4477 _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend) 4478 - relocation; 4479 addend += msec->output_section->vma + msec->output_offset; 4480 value = (value & ~ howto->dst_mask) | (addend & howto->dst_mask); 4481 bfd_put_32 (input_bfd, value, contents + rel->r_offset); 4482 } 4483 } 4484 else 4485 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 4486 } 4487 else 4488 { 4489 bfd_boolean warned; 4490 4491 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 4492 r_symndx, symtab_hdr, sym_hashes, 4493 h, sec, relocation, 4494 unresolved_reloc, warned); 4495 4496 sym_type = h->type; 4497 } 4498 4499 if (h != NULL) 4500 name = h->root.root.string; 4501 else 4502 { 4503 name = (bfd_elf_string_from_elf_section 4504 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 4505 if (name == NULL || *name == '\0') 4506 name = bfd_section_name (input_bfd, sec); 4507 } 4508 4509 if (r_symndx != 0 4510 && r_type != R_ARM_NONE 4511 && (h == NULL 4512 || h->root.type == bfd_link_hash_defined 4513 || h->root.type == bfd_link_hash_defweak) 4514 && IS_ARM_TLS_RELOC (r_type) != (sym_type == STT_TLS)) 4515 { 4516 (*_bfd_error_handler) 4517 ((sym_type == STT_TLS 4518 ? _("%B(%A+0x%lx): %s used with TLS symbol %s") 4519 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s")), 4520 input_bfd, 4521 input_section, 4522 (long) rel->r_offset, 4523 howto->name, 4524 name); 4525 } 4526 4527 r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, 4528 input_section, contents, rel, 4529 relocation, info, sec, name, 4530 (h ? ELF_ST_TYPE (h->type) : 4531 ELF_ST_TYPE (sym->st_info)), h, 4532 &unresolved_reloc); 4533 4534 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 4535 because such sections are not SEC_ALLOC and thus ld.so will 4536 not process them. */ 4537 if (unresolved_reloc 4538 && !((input_section->flags & SEC_DEBUGGING) != 0 4539 && h->def_dynamic)) 4540 { 4541 (*_bfd_error_handler) 4542 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 4543 input_bfd, 4544 input_section, 4545 (long) rel->r_offset, 4546 howto->name, 4547 h->root.root.string); 4548 return FALSE; 4549 } 4550 4551 if (r != bfd_reloc_ok) 4552 { 4553 const char * msg = (const char *) 0; 4554 4555 switch (r) 4556 { 4557 case bfd_reloc_overflow: 4558 /* If the overflowing reloc was to an undefined symbol, 4559 we have already printed one error message and there 4560 is no point complaining again. */ 4561 if ((! h || 4562 h->root.type != bfd_link_hash_undefined) 4563 && (!((*info->callbacks->reloc_overflow) 4564 (info, (h ? &h->root : NULL), name, howto->name, 4565 (bfd_vma) 0, input_bfd, input_section, 4566 rel->r_offset)))) 4567 return FALSE; 4568 break; 4569 4570 case bfd_reloc_undefined: 4571 if (!((*info->callbacks->undefined_symbol) 4572 (info, name, input_bfd, input_section, 4573 rel->r_offset, TRUE))) 4574 return FALSE; 4575 break; 4576 4577 case bfd_reloc_outofrange: 4578 msg = _("internal error: out of range error"); 4579 goto common_error; 4580 4581 case bfd_reloc_notsupported: 4582 msg = _("internal error: unsupported relocation error"); 4583 goto common_error; 4584 4585 case bfd_reloc_dangerous: 4586 msg = _("internal error: dangerous error"); 4587 goto common_error; 4588 4589 default: 4590 msg = _("internal error: unknown error"); 4591 /* fall through */ 4592 4593 common_error: 4594 if (!((*info->callbacks->warning) 4595 (info, msg, name, input_bfd, input_section, 4596 rel->r_offset))) 4597 return FALSE; 4598 break; 4599 } 4600 } 4601 } 4602 4603 return TRUE; 4604} 4605 4606/* Allocate/find an object attribute. */ 4607static aeabi_attribute * 4608elf32_arm_new_eabi_attr (bfd *abfd, int tag) 4609{ 4610 aeabi_attribute *attr; 4611 aeabi_attribute_list *list; 4612 aeabi_attribute_list *p; 4613 aeabi_attribute_list **lastp; 4614 4615 4616 if (tag < NUM_KNOWN_ATTRIBUTES) 4617 { 4618 /* Knwon tags are preallocated. */ 4619 attr = &elf32_arm_tdata (abfd)->known_eabi_attributes[tag]; 4620 } 4621 else 4622 { 4623 /* Create a new tag. */ 4624 list = (aeabi_attribute_list *) 4625 bfd_alloc (abfd, sizeof (aeabi_attribute_list)); 4626 memset (list, 0, sizeof (aeabi_attribute_list)); 4627 list->tag = tag; 4628 /* Keep the tag list in order. */ 4629 lastp = &elf32_arm_tdata (abfd)->other_eabi_attributes; 4630 for (p = *lastp; p; p = p->next) 4631 { 4632 if (tag < p->tag) 4633 break; 4634 lastp = &p->next; 4635 } 4636 list->next = *lastp; 4637 *lastp = list; 4638 attr = &list->attr; 4639 } 4640 4641 return attr; 4642} 4643 4644int 4645elf32_arm_get_eabi_attr_int (bfd *abfd, int tag) 4646{ 4647 aeabi_attribute_list *p; 4648 4649 if (tag < NUM_KNOWN_ATTRIBUTES) 4650 { 4651 /* Knwon tags are preallocated. */ 4652 return elf32_arm_tdata (abfd)->known_eabi_attributes[tag].i; 4653 } 4654 else 4655 { 4656 for (p = elf32_arm_tdata (abfd)->other_eabi_attributes; 4657 p; 4658 p = p->next) 4659 { 4660 if (tag == p->tag) 4661 return p->attr.i; 4662 if (tag < p->tag) 4663 break; 4664 } 4665 return 0; 4666 } 4667} 4668 4669void 4670elf32_arm_add_eabi_attr_int (bfd *abfd, int tag, unsigned int i) 4671{ 4672 aeabi_attribute *attr; 4673 4674 attr = elf32_arm_new_eabi_attr (abfd, tag); 4675 attr->type = 1; 4676 attr->i = i; 4677} 4678 4679static char * 4680attr_strdup (bfd *abfd, const char * s) 4681{ 4682 char * p; 4683 int len; 4684 4685 len = strlen (s) + 1; 4686 p = (char *)bfd_alloc(abfd, len); 4687 return memcpy (p, s, len); 4688} 4689 4690void 4691elf32_arm_add_eabi_attr_string (bfd *abfd, int tag, const char *s) 4692{ 4693 aeabi_attribute *attr; 4694 4695 attr = elf32_arm_new_eabi_attr (abfd, tag); 4696 attr->type = 2; 4697 attr->s = attr_strdup (abfd, s); 4698} 4699 4700void 4701elf32_arm_add_eabi_attr_compat (bfd *abfd, unsigned int i, const char *s) 4702{ 4703 aeabi_attribute_list *list; 4704 aeabi_attribute_list *p; 4705 aeabi_attribute_list **lastp; 4706 4707 list = (aeabi_attribute_list *) 4708 bfd_alloc (abfd, sizeof (aeabi_attribute_list)); 4709 memset (list, 0, sizeof (aeabi_attribute_list)); 4710 list->tag = Tag_compatibility; 4711 list->attr.type = 3; 4712 list->attr.i = i; 4713 list->attr.s = attr_strdup (abfd, s); 4714 4715 lastp = &elf32_arm_tdata (abfd)->other_eabi_attributes; 4716 for (p = *lastp; p; p = p->next) 4717 { 4718 int cmp; 4719 if (p->tag != Tag_compatibility) 4720 break; 4721 cmp = strcmp(s, p->attr.s); 4722 if (cmp < 0 || (cmp == 0 && i < p->attr.i)) 4723 break; 4724 lastp = &p->next; 4725 } 4726 list->next = *lastp; 4727 *lastp = list; 4728} 4729 4730/* Set the right machine number. */ 4731 4732static bfd_boolean 4733elf32_arm_object_p (bfd *abfd) 4734{ 4735 unsigned int mach; 4736 4737 mach = bfd_arm_get_mach_from_notes (abfd, ARM_NOTE_SECTION); 4738 4739 if (mach != bfd_mach_arm_unknown) 4740 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach); 4741 4742 else if (elf_elfheader (abfd)->e_flags & EF_ARM_MAVERICK_FLOAT) 4743 bfd_default_set_arch_mach (abfd, bfd_arch_arm, bfd_mach_arm_ep9312); 4744 4745 else 4746 bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach); 4747 4748 return TRUE; 4749} 4750 4751/* Function to keep ARM specific flags in the ELF header. */ 4752 4753static bfd_boolean 4754elf32_arm_set_private_flags (bfd *abfd, flagword flags) 4755{ 4756 if (elf_flags_init (abfd) 4757 && elf_elfheader (abfd)->e_flags != flags) 4758 { 4759 if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN) 4760 { 4761 if (flags & EF_ARM_INTERWORK) 4762 (*_bfd_error_handler) 4763 (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"), 4764 abfd); 4765 else 4766 _bfd_error_handler 4767 (_("Warning: Clearing the interworking flag of %B due to outside request"), 4768 abfd); 4769 } 4770 } 4771 else 4772 { 4773 elf_elfheader (abfd)->e_flags = flags; 4774 elf_flags_init (abfd) = TRUE; 4775 } 4776 4777 return TRUE; 4778} 4779 4780/* Copy the eabi object attribute from IBFD to OBFD. */ 4781static void 4782copy_eabi_attributes (bfd *ibfd, bfd *obfd) 4783{ 4784 aeabi_attribute *in_attr; 4785 aeabi_attribute *out_attr; 4786 aeabi_attribute_list *list; 4787 int i; 4788 4789 in_attr = elf32_arm_tdata (ibfd)->known_eabi_attributes; 4790 out_attr = elf32_arm_tdata (obfd)->known_eabi_attributes; 4791 for (i = 4; i < NUM_KNOWN_ATTRIBUTES; i++) 4792 { 4793 out_attr->i = in_attr->i; 4794 if (in_attr->s && *in_attr->s) 4795 out_attr->s = attr_strdup (obfd, in_attr->s); 4796 in_attr++; 4797 out_attr++; 4798 } 4799 4800 for (list = elf32_arm_tdata (ibfd)->other_eabi_attributes; 4801 list; 4802 list = list->next) 4803 { 4804 in_attr = &list->attr; 4805 switch (in_attr->type) 4806 { 4807 case 1: 4808 elf32_arm_add_eabi_attr_int (obfd, list->tag, in_attr->i); 4809 break; 4810 case 2: 4811 elf32_arm_add_eabi_attr_string (obfd, list->tag, in_attr->s); 4812 break; 4813 case 3: 4814 elf32_arm_add_eabi_attr_compat (obfd, in_attr->i, in_attr->s); 4815 break; 4816 default: 4817 abort(); 4818 } 4819 } 4820} 4821 4822 4823/* Copy backend specific data from one object module to another. */ 4824 4825static bfd_boolean 4826elf32_arm_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 4827{ 4828 flagword in_flags; 4829 flagword out_flags; 4830 4831 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 4832 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 4833 return TRUE; 4834 4835 in_flags = elf_elfheader (ibfd)->e_flags; 4836 out_flags = elf_elfheader (obfd)->e_flags; 4837 4838 if (elf_flags_init (obfd) 4839 && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN 4840 && in_flags != out_flags) 4841 { 4842 /* Cannot mix APCS26 and APCS32 code. */ 4843 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26)) 4844 return FALSE; 4845 4846 /* Cannot mix float APCS and non-float APCS code. */ 4847 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT)) 4848 return FALSE; 4849 4850 /* If the src and dest have different interworking flags 4851 then turn off the interworking bit. */ 4852 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK)) 4853 { 4854 if (out_flags & EF_ARM_INTERWORK) 4855 _bfd_error_handler 4856 (_("Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"), 4857 obfd, ibfd); 4858 4859 in_flags &= ~EF_ARM_INTERWORK; 4860 } 4861 4862 /* Likewise for PIC, though don't warn for this case. */ 4863 if ((in_flags & EF_ARM_PIC) != (out_flags & EF_ARM_PIC)) 4864 in_flags &= ~EF_ARM_PIC; 4865 } 4866 4867 elf_elfheader (obfd)->e_flags = in_flags; 4868 elf_flags_init (obfd) = TRUE; 4869 4870 /* Also copy the EI_OSABI field. */ 4871 elf_elfheader (obfd)->e_ident[EI_OSABI] = 4872 elf_elfheader (ibfd)->e_ident[EI_OSABI]; 4873 4874 /* Copy EABI object attributes. */ 4875 copy_eabi_attributes (ibfd, obfd); 4876 4877 return TRUE; 4878} 4879 4880/* Values for Tag_ABI_PCS_R9_use. */ 4881enum 4882{ 4883 AEABI_R9_V6, 4884 AEABI_R9_SB, 4885 AEABI_R9_TLS, 4886 AEABI_R9_unused 4887}; 4888 4889/* Values for Tag_ABI_PCS_RW_data. */ 4890enum 4891{ 4892 AEABI_PCS_RW_data_absolute, 4893 AEABI_PCS_RW_data_PCrel, 4894 AEABI_PCS_RW_data_SBrel, 4895 AEABI_PCS_RW_data_unused 4896}; 4897 4898/* Values for Tag_ABI_enum_size. */ 4899enum 4900{ 4901 AEABI_enum_unused, 4902 AEABI_enum_short, 4903 AEABI_enum_wide, 4904 AEABI_enum_forced_wide 4905}; 4906 4907/* Merge EABI object attributes from IBFD into OBFD. Raise an error if there 4908 are conflicting attributes. */ 4909static bfd_boolean 4910elf32_arm_merge_eabi_attributes (bfd *ibfd, bfd *obfd) 4911{ 4912 aeabi_attribute *in_attr; 4913 aeabi_attribute *out_attr; 4914 aeabi_attribute_list *in_list; 4915 aeabi_attribute_list *out_list; 4916 /* Some tags have 0 = don't care, 1 = strong requirement, 4917 2 = weak requirement. */ 4918 static const int order_312[3] = {3, 1, 2}; 4919 int i; 4920 4921 if (!elf32_arm_tdata (ibfd)->known_eabi_attributes[0].i) 4922 { 4923 /* This is the first object. Copy the attributes. */ 4924 copy_eabi_attributes (ibfd, obfd); 4925 return TRUE; 4926 } 4927 4928 /* Use the Tag_null value to indicate the attributes have been 4929 initialized. */ 4930 elf32_arm_tdata (ibfd)->known_eabi_attributes[0].i = 1; 4931 4932 in_attr = elf32_arm_tdata (ibfd)->known_eabi_attributes; 4933 out_attr = elf32_arm_tdata (obfd)->known_eabi_attributes; 4934 /* This needs to happen before Tag_ABI_FP_number_model is merged. */ 4935 if (in_attr[Tag_ABI_VFP_args].i != out_attr[Tag_ABI_VFP_args].i) 4936 { 4937 /* Ignore mismatches if teh object doesn't use floating point. */ 4938 if (out_attr[Tag_ABI_FP_number_model].i == 0) 4939 out_attr[Tag_ABI_VFP_args].i = in_attr[Tag_ABI_VFP_args].i; 4940 else if (in_attr[Tag_ABI_FP_number_model].i != 0) 4941 { 4942 _bfd_error_handler 4943 (_("ERROR: %B uses VFP register arguments, %B does not"), 4944 ibfd, obfd); 4945 return FALSE; 4946 } 4947 } 4948 4949 for (i = 4; i < NUM_KNOWN_ATTRIBUTES; i++) 4950 { 4951 /* Merge this attribute with existing attributes. */ 4952 switch (i) 4953 { 4954 case Tag_CPU_raw_name: 4955 case Tag_CPU_name: 4956 /* Use whichever has the greatest architecture requirements. */ 4957 if (in_attr[Tag_CPU_arch].i > out_attr[Tag_CPU_arch].i) 4958 out_attr[i].s = attr_strdup(obfd, in_attr[i].s); 4959 break; 4960 4961 case Tag_ABI_optimization_goals: 4962 case Tag_ABI_FP_optimization_goals: 4963 /* Use the first value seen. */ 4964 break; 4965 4966 case Tag_CPU_arch: 4967 case Tag_ARM_ISA_use: 4968 case Tag_THUMB_ISA_use: 4969 case Tag_VFP_arch: 4970 case Tag_WMMX_arch: 4971 case Tag_NEON_arch: 4972 /* ??? Do NEON and WMMX conflict? */ 4973 case Tag_ABI_FP_rounding: 4974 case Tag_ABI_FP_denormal: 4975 case Tag_ABI_FP_exceptions: 4976 case Tag_ABI_FP_user_exceptions: 4977 case Tag_ABI_FP_number_model: 4978 case Tag_ABI_align8_preserved: 4979 case Tag_ABI_HardFP_use: 4980 /* Use the largest value specified. */ 4981 if (in_attr[i].i > out_attr[i].i) 4982 out_attr[i].i = in_attr[i].i; 4983 break; 4984 4985 case Tag_CPU_arch_profile: 4986 /* Warn if conflicting architecture profiles used. */ 4987 if (out_attr[i].i && in_attr[i].i && in_attr[i].i != out_attr[i].i) 4988 { 4989 _bfd_error_handler 4990 (_("ERROR: %B: Conflicting architecture profiles %c/%c"), 4991 ibfd, in_attr[i].i, out_attr[i].i); 4992 return FALSE; 4993 } 4994 if (in_attr[i].i) 4995 out_attr[i].i = in_attr[i].i; 4996 break; 4997 case Tag_PCS_config: 4998 if (out_attr[i].i == 0) 4999 out_attr[i].i = in_attr[i].i; 5000 else if (in_attr[i].i != 0 && out_attr[i].i != 0) 5001 { 5002 /* It's sometimes ok to mix different configs, so this is only 5003 a warning. */ 5004 _bfd_error_handler 5005 (_("Warning: %B: Conflicting platform configuration"), ibfd); 5006 } 5007 break; 5008 case Tag_ABI_PCS_R9_use: 5009 if (out_attr[i].i != AEABI_R9_unused 5010 && in_attr[i].i != AEABI_R9_unused) 5011 { 5012 _bfd_error_handler 5013 (_("ERROR: %B: Conflicting use of R9"), ibfd); 5014 return FALSE; 5015 } 5016 if (out_attr[i].i == AEABI_R9_unused) 5017 out_attr[i].i = in_attr[i].i; 5018 break; 5019 case Tag_ABI_PCS_RW_data: 5020 if (in_attr[i].i == AEABI_PCS_RW_data_SBrel 5021 && out_attr[Tag_ABI_PCS_R9_use].i != AEABI_R9_SB 5022 && out_attr[Tag_ABI_PCS_R9_use].i != AEABI_R9_unused) 5023 { 5024 _bfd_error_handler 5025 (_("ERROR: %B: SB relative addressing conflicts with use of R9"), 5026 ibfd); 5027 return FALSE; 5028 } 5029 /* Use the smallest value specified. */ 5030 if (in_attr[i].i < out_attr[i].i) 5031 out_attr[i].i = in_attr[i].i; 5032 break; 5033 case Tag_ABI_PCS_RO_data: 5034 /* Use the smallest value specified. */ 5035 if (in_attr[i].i < out_attr[i].i) 5036 out_attr[i].i = in_attr[i].i; 5037 break; 5038 case Tag_ABI_PCS_GOT_use: 5039 if (in_attr[i].i > 2 || out_attr[i].i > 2 5040 || order_312[in_attr[i].i] < order_312[out_attr[i].i]) 5041 out_attr[i].i = in_attr[i].i; 5042 break; 5043 case Tag_ABI_PCS_wchar_t: 5044 if (out_attr[i].i && in_attr[i].i && out_attr[i].i != in_attr[i].i) 5045 { 5046 _bfd_error_handler 5047 (_("ERROR: %B: Conflicting definitions of wchar_t"), ibfd); 5048 return FALSE; 5049 } 5050 if (in_attr[i].i) 5051 out_attr[i].i = in_attr[i].i; 5052 break; 5053 case Tag_ABI_align8_needed: 5054 /* ??? Check against Tag_ABI_align8_preserved. */ 5055 if (in_attr[i].i > 2 || out_attr[i].i > 2 5056 || order_312[in_attr[i].i] < order_312[out_attr[i].i]) 5057 out_attr[i].i = in_attr[i].i; 5058 break; 5059 case Tag_ABI_enum_size: 5060 if (in_attr[i].i != AEABI_enum_unused) 5061 { 5062 if (out_attr[i].i == AEABI_enum_unused 5063 || out_attr[i].i == AEABI_enum_forced_wide) 5064 { 5065 /* The existing object is compatible with anything. 5066 Use whatever requirements the new object has. */ 5067 out_attr[i].i = in_attr[i].i; 5068 } 5069 else if (in_attr[i].i != AEABI_enum_forced_wide 5070 && out_attr[i].i != in_attr[i].i) 5071 { 5072 _bfd_error_handler 5073 (_("ERROR: %B: Conflicting enum sizes"), ibfd); 5074 } 5075 } 5076 break; 5077 case Tag_ABI_VFP_args: 5078 /* Aready done. */ 5079 break; 5080 case Tag_ABI_WMMX_args: 5081 if (in_attr[i].i != out_attr[i].i) 5082 { 5083 _bfd_error_handler 5084 (_("ERROR: %B uses iWMMXt register arguments, %B does not"), 5085 ibfd, obfd); 5086 return FALSE; 5087 } 5088 break; 5089 default: /* All known attributes should be explicitly covered. */ 5090 abort (); 5091 } 5092 } 5093 5094 in_list = elf32_arm_tdata (ibfd)->other_eabi_attributes; 5095 out_list = elf32_arm_tdata (ibfd)->other_eabi_attributes; 5096 while (in_list && in_list->tag == Tag_compatibility) 5097 { 5098 in_attr = &in_list->attr; 5099 if (in_attr->i == 0) 5100 continue; 5101 if (in_attr->i == 1) 5102 { 5103 _bfd_error_handler 5104 (_("ERROR: %B: Must be processed by '%s' toolchain"), 5105 ibfd, in_attr->s); 5106 return FALSE; 5107 } 5108 if (!out_list || out_list->tag != Tag_compatibility 5109 || strcmp (in_attr->s, out_list->attr.s) != 0) 5110 { 5111 /* Add this compatibility tag to the output. */ 5112 elf32_arm_add_eabi_attr_compat (obfd, in_attr->i, in_attr->s); 5113 continue; 5114 } 5115 out_attr = &out_list->attr; 5116 /* Check all the input tags with the same identifier. */ 5117 for (;;) 5118 { 5119 if (out_list->tag != Tag_compatibility 5120 || in_attr->i != out_attr->i 5121 || strcmp (in_attr->s, out_attr->s) != 0) 5122 { 5123 _bfd_error_handler 5124 (_("ERROR: %B: Incompatible object tag '%s':%d"), 5125 ibfd, in_attr->s, in_attr->i); 5126 return FALSE; 5127 } 5128 in_list = in_list->next; 5129 if (in_list->tag != Tag_compatibility 5130 || strcmp (in_attr->s, in_list->attr.s) != 0) 5131 break; 5132 in_attr = &in_list->attr; 5133 out_list = out_list->next; 5134 if (out_list) 5135 out_attr = &out_list->attr; 5136 } 5137 5138 /* Check the output doesn't have extra tags with this identifier. */ 5139 if (out_list && out_list->tag == Tag_compatibility 5140 && strcmp (in_attr->s, out_list->attr.s) == 0) 5141 { 5142 _bfd_error_handler 5143 (_("ERROR: %B: Incompatible object tag '%s':%d"), 5144 ibfd, in_attr->s, out_list->attr.i); 5145 return FALSE; 5146 } 5147 } 5148 5149 for (; in_list; in_list = in_list->next) 5150 { 5151 if ((in_list->tag & 128) < 64) 5152 { 5153 _bfd_error_handler 5154 (_("Warning: %B: Unknown EABI object attribute %d"), 5155 ibfd, in_list->tag); 5156 break; 5157 } 5158 } 5159 return TRUE; 5160} 5161 5162 5163/* Return TRUE if the two EABI versions are incompatible. */ 5164 5165static bfd_boolean 5166elf32_arm_versions_compatible (unsigned iver, unsigned over) 5167{ 5168 /* v4 and v5 are the same spec before and after it was released, 5169 so allow mixing them. */ 5170 if ((iver == EF_ARM_EABI_VER4 && over == EF_ARM_EABI_VER5) 5171 || (iver == EF_ARM_EABI_VER5 && over == EF_ARM_EABI_VER4)) 5172 return TRUE; 5173 5174 return (iver == over); 5175} 5176 5177/* Merge backend specific data from an object file to the output 5178 object file when linking. */ 5179 5180static bfd_boolean 5181elf32_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd) 5182{ 5183 flagword out_flags; 5184 flagword in_flags; 5185 bfd_boolean flags_compatible = TRUE; 5186 asection *sec; 5187 5188 /* Check if we have the same endianess. */ 5189 if (! _bfd_generic_verify_endian_match (ibfd, obfd)) 5190 return FALSE; 5191 5192 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 5193 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 5194 return TRUE; 5195 5196 if (!elf32_arm_merge_eabi_attributes (ibfd, obfd)) 5197 return FALSE; 5198 5199 /* The input BFD must have had its flags initialised. */ 5200 /* The following seems bogus to me -- The flags are initialized in 5201 the assembler but I don't think an elf_flags_init field is 5202 written into the object. */ 5203 /* BFD_ASSERT (elf_flags_init (ibfd)); */ 5204 5205 in_flags = elf_elfheader (ibfd)->e_flags; 5206 out_flags = elf_elfheader (obfd)->e_flags; 5207 5208 if (!elf_flags_init (obfd)) 5209 { 5210 /* If the input is the default architecture and had the default 5211 flags then do not bother setting the flags for the output 5212 architecture, instead allow future merges to do this. If no 5213 future merges ever set these flags then they will retain their 5214 uninitialised values, which surprise surprise, correspond 5215 to the default values. */ 5216 if (bfd_get_arch_info (ibfd)->the_default 5217 && elf_elfheader (ibfd)->e_flags == 0) 5218 return TRUE; 5219 5220 elf_flags_init (obfd) = TRUE; 5221 elf_elfheader (obfd)->e_flags = in_flags; 5222 5223 if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) 5224 && bfd_get_arch_info (obfd)->the_default) 5225 return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); 5226 5227 return TRUE; 5228 } 5229 5230 /* Determine what should happen if the input ARM architecture 5231 does not match the output ARM architecture. */ 5232 if (! bfd_arm_merge_machines (ibfd, obfd)) 5233 return FALSE; 5234 5235 /* Identical flags must be compatible. */ 5236 if (in_flags == out_flags) 5237 return TRUE; 5238 5239 /* Check to see if the input BFD actually contains any sections. If 5240 not, its flags may not have been initialised either, but it 5241 cannot actually cause any incompatiblity. Do not short-circuit 5242 dynamic objects; their section list may be emptied by 5243 elf_link_add_object_symbols. 5244 5245 Also check to see if there are no code sections in the input. 5246 In this case there is no need to check for code specific flags. 5247 XXX - do we need to worry about floating-point format compatability 5248 in data sections ? */ 5249 if (!(ibfd->flags & DYNAMIC)) 5250 { 5251 bfd_boolean null_input_bfd = TRUE; 5252 bfd_boolean only_data_sections = TRUE; 5253 5254 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 5255 { 5256 /* Ignore synthetic glue sections. */ 5257 if (strcmp (sec->name, ".glue_7") 5258 && strcmp (sec->name, ".glue_7t")) 5259 { 5260 if ((bfd_get_section_flags (ibfd, sec) 5261 & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) 5262 == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) 5263 only_data_sections = FALSE; 5264 5265 null_input_bfd = FALSE; 5266 break; 5267 } 5268 } 5269 5270 if (null_input_bfd || only_data_sections) 5271 return TRUE; 5272 } 5273 5274 /* Complain about various flag mismatches. */ 5275 if (!elf32_arm_versions_compatible (EF_ARM_EABI_VERSION (in_flags), 5276 EF_ARM_EABI_VERSION (out_flags))) 5277 { 5278 _bfd_error_handler 5279 (_("ERROR: Source object %B has EABI version %d, but target %B has EABI version %d"), 5280 ibfd, obfd, 5281 (in_flags & EF_ARM_EABIMASK) >> 24, 5282 (out_flags & EF_ARM_EABIMASK) >> 24); 5283 return FALSE; 5284 } 5285 5286 /* Not sure what needs to be checked for EABI versions >= 1. */ 5287 /* VxWorks libraries do not use these flags. */ 5288 if (get_elf_backend_data (obfd) != &elf32_arm_vxworks_bed 5289 && get_elf_backend_data (ibfd) != &elf32_arm_vxworks_bed 5290 && EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN) 5291 { 5292 if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26)) 5293 { 5294 _bfd_error_handler 5295 (_("ERROR: %B is compiled for APCS-%d, whereas target %B uses APCS-%d"), 5296 ibfd, obfd, 5297 in_flags & EF_ARM_APCS_26 ? 26 : 32, 5298 out_flags & EF_ARM_APCS_26 ? 26 : 32); 5299 flags_compatible = FALSE; 5300 } 5301 5302 if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT)) 5303 { 5304 if (in_flags & EF_ARM_APCS_FLOAT) 5305 _bfd_error_handler 5306 (_("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers"), 5307 ibfd, obfd); 5308 else 5309 _bfd_error_handler 5310 (_("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers"), 5311 ibfd, obfd); 5312 5313 flags_compatible = FALSE; 5314 } 5315 5316 if ((in_flags & EF_ARM_VFP_FLOAT) != (out_flags & EF_ARM_VFP_FLOAT)) 5317 { 5318 if (in_flags & EF_ARM_VFP_FLOAT) 5319 _bfd_error_handler 5320 (_("ERROR: %B uses VFP instructions, whereas %B does not"), 5321 ibfd, obfd); 5322 else 5323 _bfd_error_handler 5324 (_("ERROR: %B uses FPA instructions, whereas %B does not"), 5325 ibfd, obfd); 5326 5327 flags_compatible = FALSE; 5328 } 5329 5330 if ((in_flags & EF_ARM_MAVERICK_FLOAT) != (out_flags & EF_ARM_MAVERICK_FLOAT)) 5331 { 5332 if (in_flags & EF_ARM_MAVERICK_FLOAT) 5333 _bfd_error_handler 5334 (_("ERROR: %B uses Maverick instructions, whereas %B does not"), 5335 ibfd, obfd); 5336 else 5337 _bfd_error_handler 5338 (_("ERROR: %B does not use Maverick instructions, whereas %B does"), 5339 ibfd, obfd); 5340 5341 flags_compatible = FALSE; 5342 } 5343 5344#ifdef EF_ARM_SOFT_FLOAT 5345 if ((in_flags & EF_ARM_SOFT_FLOAT) != (out_flags & EF_ARM_SOFT_FLOAT)) 5346 { 5347 /* We can allow interworking between code that is VFP format 5348 layout, and uses either soft float or integer regs for 5349 passing floating point arguments and results. We already 5350 know that the APCS_FLOAT flags match; similarly for VFP 5351 flags. */ 5352 if ((in_flags & EF_ARM_APCS_FLOAT) != 0 5353 || (in_flags & EF_ARM_VFP_FLOAT) == 0) 5354 { 5355 if (in_flags & EF_ARM_SOFT_FLOAT) 5356 _bfd_error_handler 5357 (_("ERROR: %B uses software FP, whereas %B uses hardware FP"), 5358 ibfd, obfd); 5359 else 5360 _bfd_error_handler 5361 (_("ERROR: %B uses hardware FP, whereas %B uses software FP"), 5362 ibfd, obfd); 5363 5364 flags_compatible = FALSE; 5365 } 5366 } 5367#endif 5368 5369 /* Interworking mismatch is only a warning. */ 5370 if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK)) 5371 { 5372 if (in_flags & EF_ARM_INTERWORK) 5373 { 5374 _bfd_error_handler 5375 (_("Warning: %B supports interworking, whereas %B does not"), 5376 ibfd, obfd); 5377 } 5378 else 5379 { 5380 _bfd_error_handler 5381 (_("Warning: %B does not support interworking, whereas %B does"), 5382 ibfd, obfd); 5383 } 5384 } 5385 } 5386 5387 return flags_compatible; 5388} 5389 5390/* Display the flags field. */ 5391 5392static bfd_boolean 5393elf32_arm_print_private_bfd_data (bfd *abfd, void * ptr) 5394{ 5395 FILE * file = (FILE *) ptr; 5396 unsigned long flags; 5397 5398 BFD_ASSERT (abfd != NULL && ptr != NULL); 5399 5400 /* Print normal ELF private data. */ 5401 _bfd_elf_print_private_bfd_data (abfd, ptr); 5402 5403 flags = elf_elfheader (abfd)->e_flags; 5404 /* Ignore init flag - it may not be set, despite the flags field 5405 containing valid data. */ 5406 5407 /* xgettext:c-format */ 5408 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 5409 5410 switch (EF_ARM_EABI_VERSION (flags)) 5411 { 5412 case EF_ARM_EABI_UNKNOWN: 5413 /* The following flag bits are GNU extensions and not part of the 5414 official ARM ELF extended ABI. Hence they are only decoded if 5415 the EABI version is not set. */ 5416 if (flags & EF_ARM_INTERWORK) 5417 fprintf (file, _(" [interworking enabled]")); 5418 5419 if (flags & EF_ARM_APCS_26) 5420 fprintf (file, " [APCS-26]"); 5421 else 5422 fprintf (file, " [APCS-32]"); 5423 5424 if (flags & EF_ARM_VFP_FLOAT) 5425 fprintf (file, _(" [VFP float format]")); 5426 else if (flags & EF_ARM_MAVERICK_FLOAT) 5427 fprintf (file, _(" [Maverick float format]")); 5428 else 5429 fprintf (file, _(" [FPA float format]")); 5430 5431 if (flags & EF_ARM_APCS_FLOAT) 5432 fprintf (file, _(" [floats passed in float registers]")); 5433 5434 if (flags & EF_ARM_PIC) 5435 fprintf (file, _(" [position independent]")); 5436 5437 if (flags & EF_ARM_NEW_ABI) 5438 fprintf (file, _(" [new ABI]")); 5439 5440 if (flags & EF_ARM_OLD_ABI) 5441 fprintf (file, _(" [old ABI]")); 5442 5443 if (flags & EF_ARM_SOFT_FLOAT) 5444 fprintf (file, _(" [software FP]")); 5445 5446 flags &= ~(EF_ARM_INTERWORK | EF_ARM_APCS_26 | EF_ARM_APCS_FLOAT 5447 | EF_ARM_PIC | EF_ARM_NEW_ABI | EF_ARM_OLD_ABI 5448 | EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT 5449 | EF_ARM_MAVERICK_FLOAT); 5450 break; 5451 5452 case EF_ARM_EABI_VER1: 5453 fprintf (file, _(" [Version1 EABI]")); 5454 5455 if (flags & EF_ARM_SYMSARESORTED) 5456 fprintf (file, _(" [sorted symbol table]")); 5457 else 5458 fprintf (file, _(" [unsorted symbol table]")); 5459 5460 flags &= ~ EF_ARM_SYMSARESORTED; 5461 break; 5462 5463 case EF_ARM_EABI_VER2: 5464 fprintf (file, _(" [Version2 EABI]")); 5465 5466 if (flags & EF_ARM_SYMSARESORTED) 5467 fprintf (file, _(" [sorted symbol table]")); 5468 else 5469 fprintf (file, _(" [unsorted symbol table]")); 5470 5471 if (flags & EF_ARM_DYNSYMSUSESEGIDX) 5472 fprintf (file, _(" [dynamic symbols use segment index]")); 5473 5474 if (flags & EF_ARM_MAPSYMSFIRST) 5475 fprintf (file, _(" [mapping symbols precede others]")); 5476 5477 flags &= ~(EF_ARM_SYMSARESORTED | EF_ARM_DYNSYMSUSESEGIDX 5478 | EF_ARM_MAPSYMSFIRST); 5479 break; 5480 5481 case EF_ARM_EABI_VER3: 5482 fprintf (file, _(" [Version3 EABI]")); 5483 break; 5484 5485 case EF_ARM_EABI_VER4: 5486 fprintf (file, _(" [Version4 EABI]")); 5487 goto eabi; 5488 5489 case EF_ARM_EABI_VER5: 5490 fprintf (file, _(" [Version5 EABI]")); 5491 eabi: 5492 if (flags & EF_ARM_BE8) 5493 fprintf (file, _(" [BE8]")); 5494 5495 if (flags & EF_ARM_LE8) 5496 fprintf (file, _(" [LE8]")); 5497 5498 flags &= ~(EF_ARM_LE8 | EF_ARM_BE8); 5499 break; 5500 5501 default: 5502 fprintf (file, _(" <EABI version unrecognised>")); 5503 break; 5504 } 5505 5506 flags &= ~ EF_ARM_EABIMASK; 5507 5508 if (flags & EF_ARM_RELEXEC) 5509 fprintf (file, _(" [relocatable executable]")); 5510 5511 if (flags & EF_ARM_HASENTRY) 5512 fprintf (file, _(" [has entry point]")); 5513 5514 flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY); 5515 5516 if (flags) 5517 fprintf (file, _("<Unrecognised flag bits set>")); 5518 5519 fputc ('\n', file); 5520 5521 return TRUE; 5522} 5523 5524static int 5525elf32_arm_get_symbol_type (Elf_Internal_Sym * elf_sym, int type) 5526{ 5527 switch (ELF_ST_TYPE (elf_sym->st_info)) 5528 { 5529 case STT_ARM_TFUNC: 5530 return ELF_ST_TYPE (elf_sym->st_info); 5531 5532 case STT_ARM_16BIT: 5533 /* If the symbol is not an object, return the STT_ARM_16BIT flag. 5534 This allows us to distinguish between data used by Thumb instructions 5535 and non-data (which is probably code) inside Thumb regions of an 5536 executable. */ 5537 if (type != STT_OBJECT && type != STT_TLS) 5538 return ELF_ST_TYPE (elf_sym->st_info); 5539 break; 5540 5541 default: 5542 break; 5543 } 5544 5545 return type; 5546} 5547 5548static asection * 5549elf32_arm_gc_mark_hook (asection * sec, 5550 struct bfd_link_info * info ATTRIBUTE_UNUSED, 5551 Elf_Internal_Rela * rel, 5552 struct elf_link_hash_entry * h, 5553 Elf_Internal_Sym * sym) 5554{ 5555 if (h != NULL) 5556 { 5557 switch (ELF32_R_TYPE (rel->r_info)) 5558 { 5559 case R_ARM_GNU_VTINHERIT: 5560 case R_ARM_GNU_VTENTRY: 5561 break; 5562 5563 default: 5564 switch (h->root.type) 5565 { 5566 case bfd_link_hash_defined: 5567 case bfd_link_hash_defweak: 5568 return h->root.u.def.section; 5569 5570 case bfd_link_hash_common: 5571 return h->root.u.c.p->section; 5572 5573 default: 5574 break; 5575 } 5576 } 5577 } 5578 else 5579 return bfd_section_from_elf_index (sec->owner, sym->st_shndx); 5580 5581 return NULL; 5582} 5583 5584/* Update the got entry reference counts for the section being removed. */ 5585 5586static bfd_boolean 5587elf32_arm_gc_sweep_hook (bfd * abfd, 5588 struct bfd_link_info * info, 5589 asection * sec, 5590 const Elf_Internal_Rela * relocs) 5591{ 5592 Elf_Internal_Shdr *symtab_hdr; 5593 struct elf_link_hash_entry **sym_hashes; 5594 bfd_signed_vma *local_got_refcounts; 5595 const Elf_Internal_Rela *rel, *relend; 5596 struct elf32_arm_link_hash_table * globals; 5597 5598 globals = elf32_arm_hash_table (info); 5599 5600 elf_section_data (sec)->local_dynrel = NULL; 5601 5602 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 5603 sym_hashes = elf_sym_hashes (abfd); 5604 local_got_refcounts = elf_local_got_refcounts (abfd); 5605 5606 relend = relocs + sec->reloc_count; 5607 for (rel = relocs; rel < relend; rel++) 5608 { 5609 unsigned long r_symndx; 5610 struct elf_link_hash_entry *h = NULL; 5611 int r_type; 5612 5613 r_symndx = ELF32_R_SYM (rel->r_info); 5614 if (r_symndx >= symtab_hdr->sh_info) 5615 { 5616 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 5617 while (h->root.type == bfd_link_hash_indirect 5618 || h->root.type == bfd_link_hash_warning) 5619 h = (struct elf_link_hash_entry *) h->root.u.i.link; 5620 } 5621 5622 r_type = ELF32_R_TYPE (rel->r_info); 5623 r_type = arm_real_reloc_type (globals, r_type); 5624 switch (r_type) 5625 { 5626 case R_ARM_GOT32: 5627 case R_ARM_GOT_PREL: 5628 case R_ARM_TLS_GD32: 5629 case R_ARM_TLS_IE32: 5630 if (h != NULL) 5631 { 5632 if (h->got.refcount > 0) 5633 h->got.refcount -= 1; 5634 } 5635 else if (local_got_refcounts != NULL) 5636 { 5637 if (local_got_refcounts[r_symndx] > 0) 5638 local_got_refcounts[r_symndx] -= 1; 5639 } 5640 break; 5641 5642 case R_ARM_TLS_LDM32: 5643 elf32_arm_hash_table (info)->tls_ldm_got.refcount -= 1; 5644 break; 5645 5646 case R_ARM_ABS32: 5647 case R_ARM_REL32: 5648 case R_ARM_PC24: 5649 case R_ARM_PLT32: 5650 case R_ARM_CALL: 5651 case R_ARM_JUMP24: 5652 case R_ARM_PREL31: 5653 case R_ARM_THM_CALL: 5654 /* Should the interworking branches be here also? */ 5655 5656 if (h != NULL) 5657 { 5658 struct elf32_arm_link_hash_entry *eh; 5659 struct elf32_arm_relocs_copied **pp; 5660 struct elf32_arm_relocs_copied *p; 5661 5662 eh = (struct elf32_arm_link_hash_entry *) h; 5663 5664 if (h->plt.refcount > 0) 5665 { 5666 h->plt.refcount -= 1; 5667 if (ELF32_R_TYPE (rel->r_info) == R_ARM_THM_CALL) 5668 eh->plt_thumb_refcount--; 5669 } 5670 5671 if (r_type == R_ARM_ABS32 5672 || r_type == R_ARM_REL32) 5673 { 5674 for (pp = &eh->relocs_copied; (p = *pp) != NULL; 5675 pp = &p->next) 5676 if (p->section == sec) 5677 { 5678 p->count -= 1; 5679 if (ELF32_R_TYPE (rel->r_info) == R_ARM_REL32) 5680 p->pc_count -= 1; 5681 if (p->count == 0) 5682 *pp = p->next; 5683 break; 5684 } 5685 } 5686 } 5687 break; 5688 5689 default: 5690 break; 5691 } 5692 } 5693 5694 return TRUE; 5695} 5696 5697/* Look through the relocs for a section during the first phase. */ 5698 5699static bfd_boolean 5700elf32_arm_check_relocs (bfd *abfd, struct bfd_link_info *info, 5701 asection *sec, const Elf_Internal_Rela *relocs) 5702{ 5703 Elf_Internal_Shdr *symtab_hdr; 5704 struct elf_link_hash_entry **sym_hashes; 5705 struct elf_link_hash_entry **sym_hashes_end; 5706 const Elf_Internal_Rela *rel; 5707 const Elf_Internal_Rela *rel_end; 5708 bfd *dynobj; 5709 asection *sreloc; 5710 bfd_vma *local_got_offsets; 5711 struct elf32_arm_link_hash_table *htab; 5712 5713 if (info->relocatable) 5714 return TRUE; 5715 5716 htab = elf32_arm_hash_table (info); 5717 sreloc = NULL; 5718 5719 /* Create dynamic sections for relocatable executables so that we can 5720 copy relocations. */ 5721 if (htab->root.is_relocatable_executable 5722 && ! htab->root.dynamic_sections_created) 5723 { 5724 if (! _bfd_elf_link_create_dynamic_sections (abfd, info)) 5725 return FALSE; 5726 } 5727 5728 dynobj = elf_hash_table (info)->dynobj; 5729 local_got_offsets = elf_local_got_offsets (abfd); 5730 5731 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 5732 sym_hashes = elf_sym_hashes (abfd); 5733 sym_hashes_end = sym_hashes 5734 + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); 5735 5736 if (!elf_bad_symtab (abfd)) 5737 sym_hashes_end -= symtab_hdr->sh_info; 5738 5739 rel_end = relocs + sec->reloc_count; 5740 for (rel = relocs; rel < rel_end; rel++) 5741 { 5742 struct elf_link_hash_entry *h; 5743 struct elf32_arm_link_hash_entry *eh; 5744 unsigned long r_symndx; 5745 int r_type; 5746 5747 r_symndx = ELF32_R_SYM (rel->r_info); 5748 r_type = ELF32_R_TYPE (rel->r_info); 5749 r_type = arm_real_reloc_type (htab, r_type); 5750 5751 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 5752 { 5753 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), abfd, 5754 r_symndx); 5755 return FALSE; 5756 } 5757 5758 if (r_symndx < symtab_hdr->sh_info) 5759 h = NULL; 5760 else 5761 { 5762 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 5763 while (h->root.type == bfd_link_hash_indirect 5764 || h->root.type == bfd_link_hash_warning) 5765 h = (struct elf_link_hash_entry *) h->root.u.i.link; 5766 } 5767 5768 eh = (struct elf32_arm_link_hash_entry *) h; 5769 5770 switch (r_type) 5771 { 5772 case R_ARM_GOT32: 5773 case R_ARM_GOT_PREL: 5774 case R_ARM_TLS_GD32: 5775 case R_ARM_TLS_IE32: 5776 /* This symbol requires a global offset table entry. */ 5777 { 5778 int tls_type, old_tls_type; 5779 5780 switch (r_type) 5781 { 5782 case R_ARM_TLS_GD32: tls_type = GOT_TLS_GD; break; 5783 case R_ARM_TLS_IE32: tls_type = GOT_TLS_IE; break; 5784 default: tls_type = GOT_NORMAL; break; 5785 } 5786 5787 if (h != NULL) 5788 { 5789 h->got.refcount++; 5790 old_tls_type = elf32_arm_hash_entry (h)->tls_type; 5791 } 5792 else 5793 { 5794 bfd_signed_vma *local_got_refcounts; 5795 5796 /* This is a global offset table entry for a local symbol. */ 5797 local_got_refcounts = elf_local_got_refcounts (abfd); 5798 if (local_got_refcounts == NULL) 5799 { 5800 bfd_size_type size; 5801 5802 size = symtab_hdr->sh_info; 5803 size *= (sizeof (bfd_signed_vma) + sizeof(char)); 5804 local_got_refcounts = bfd_zalloc (abfd, size); 5805 if (local_got_refcounts == NULL) 5806 return FALSE; 5807 elf_local_got_refcounts (abfd) = local_got_refcounts; 5808 elf32_arm_local_got_tls_type (abfd) 5809 = (char *) (local_got_refcounts + symtab_hdr->sh_info); 5810 } 5811 local_got_refcounts[r_symndx] += 1; 5812 old_tls_type = elf32_arm_local_got_tls_type (abfd) [r_symndx]; 5813 } 5814 5815 /* We will already have issued an error message if there is a 5816 TLS / non-TLS mismatch, based on the symbol type. We don't 5817 support any linker relaxations. So just combine any TLS 5818 types needed. */ 5819 if (old_tls_type != GOT_UNKNOWN && old_tls_type != GOT_NORMAL 5820 && tls_type != GOT_NORMAL) 5821 tls_type |= old_tls_type; 5822 5823 if (old_tls_type != tls_type) 5824 { 5825 if (h != NULL) 5826 elf32_arm_hash_entry (h)->tls_type = tls_type; 5827 else 5828 elf32_arm_local_got_tls_type (abfd) [r_symndx] = tls_type; 5829 } 5830 } 5831 /* Fall through */ 5832 5833 case R_ARM_TLS_LDM32: 5834 if (r_type == R_ARM_TLS_LDM32) 5835 htab->tls_ldm_got.refcount++; 5836 /* Fall through */ 5837 5838 case R_ARM_GOTOFF32: 5839 case R_ARM_GOTPC: 5840 if (htab->sgot == NULL) 5841 { 5842 if (htab->root.dynobj == NULL) 5843 htab->root.dynobj = abfd; 5844 if (!create_got_section (htab->root.dynobj, info)) 5845 return FALSE; 5846 } 5847 break; 5848 5849 case R_ARM_ABS12: 5850 /* VxWorks uses dynamic R_ARM_ABS12 relocations for 5851 ldr __GOTT_INDEX__ offsets. */ 5852 if (!htab->vxworks_p) 5853 break; 5854 /* Fall through */ 5855 5856 case R_ARM_ABS32: 5857 case R_ARM_REL32: 5858 case R_ARM_PC24: 5859 case R_ARM_PLT32: 5860 case R_ARM_CALL: 5861 case R_ARM_JUMP24: 5862 case R_ARM_PREL31: 5863 case R_ARM_THM_CALL: 5864 /* Should the interworking branches be listed here? */ 5865 if (h != NULL) 5866 { 5867 /* If this reloc is in a read-only section, we might 5868 need a copy reloc. We can't check reliably at this 5869 stage whether the section is read-only, as input 5870 sections have not yet been mapped to output sections. 5871 Tentatively set the flag for now, and correct in 5872 adjust_dynamic_symbol. */ 5873 if (!info->shared) 5874 h->non_got_ref = 1; 5875 5876 /* We may need a .plt entry if the function this reloc 5877 refers to is in a different object. We can't tell for 5878 sure yet, because something later might force the 5879 symbol local. */ 5880 if (r_type == R_ARM_PC24 5881 || r_type == R_ARM_CALL 5882 || r_type == R_ARM_JUMP24 5883 || r_type == R_ARM_PREL31 5884 || r_type == R_ARM_PLT32 5885 || r_type == R_ARM_THM_CALL) 5886 h->needs_plt = 1; 5887 5888 /* If we create a PLT entry, this relocation will reference 5889 it, even if it's an ABS32 relocation. */ 5890 h->plt.refcount += 1; 5891 5892 if (r_type == R_ARM_THM_CALL) 5893 eh->plt_thumb_refcount += 1; 5894 } 5895 5896 /* If we are creating a shared library or relocatable executable, 5897 and this is a reloc against a global symbol, or a non PC 5898 relative reloc against a local symbol, then we need to copy 5899 the reloc into the shared library. However, if we are linking 5900 with -Bsymbolic, we do not need to copy a reloc against a 5901 global symbol which is defined in an object we are 5902 including in the link (i.e., DEF_REGULAR is set). At 5903 this point we have not seen all the input files, so it is 5904 possible that DEF_REGULAR is not set now but will be set 5905 later (it is never cleared). We account for that 5906 possibility below by storing information in the 5907 relocs_copied field of the hash table entry. */ 5908 if ((info->shared || htab->root.is_relocatable_executable) 5909 && (sec->flags & SEC_ALLOC) != 0 5910 && (r_type == R_ARM_ABS32 5911 || (h != NULL && ! h->needs_plt 5912 && (! info->symbolic || ! h->def_regular)))) 5913 { 5914 struct elf32_arm_relocs_copied *p, **head; 5915 5916 /* When creating a shared object, we must copy these 5917 reloc types into the output file. We create a reloc 5918 section in dynobj and make room for this reloc. */ 5919 if (sreloc == NULL) 5920 { 5921 const char * name; 5922 5923 name = (bfd_elf_string_from_elf_section 5924 (abfd, 5925 elf_elfheader (abfd)->e_shstrndx, 5926 elf_section_data (sec)->rel_hdr.sh_name)); 5927 if (name == NULL) 5928 return FALSE; 5929 5930 BFD_ASSERT (reloc_section_p (htab, name, sec)); 5931 5932 sreloc = bfd_get_section_by_name (dynobj, name); 5933 if (sreloc == NULL) 5934 { 5935 flagword flags; 5936 5937 flags = (SEC_HAS_CONTENTS | SEC_READONLY 5938 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 5939 if ((sec->flags & SEC_ALLOC) != 0 5940 /* BPABI objects never have dynamic 5941 relocations mapped. */ 5942 && !htab->symbian_p) 5943 flags |= SEC_ALLOC | SEC_LOAD; 5944 sreloc = bfd_make_section_with_flags (dynobj, 5945 name, 5946 flags); 5947 if (sreloc == NULL 5948 || ! bfd_set_section_alignment (dynobj, sreloc, 2)) 5949 return FALSE; 5950 } 5951 5952 elf_section_data (sec)->sreloc = sreloc; 5953 } 5954 5955 /* If this is a global symbol, we count the number of 5956 relocations we need for this symbol. */ 5957 if (h != NULL) 5958 { 5959 head = &((struct elf32_arm_link_hash_entry *) h)->relocs_copied; 5960 } 5961 else 5962 { 5963 /* Track dynamic relocs needed for local syms too. 5964 We really need local syms available to do this 5965 easily. Oh well. */ 5966 5967 asection *s; 5968 void *vpp; 5969 5970 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 5971 sec, r_symndx); 5972 if (s == NULL) 5973 return FALSE; 5974 5975 vpp = &elf_section_data (s)->local_dynrel; 5976 head = (struct elf32_arm_relocs_copied **) vpp; 5977 } 5978 5979 p = *head; 5980 if (p == NULL || p->section != sec) 5981 { 5982 bfd_size_type amt = sizeof *p; 5983 5984 p = bfd_alloc (htab->root.dynobj, amt); 5985 if (p == NULL) 5986 return FALSE; 5987 p->next = *head; 5988 *head = p; 5989 p->section = sec; 5990 p->count = 0; 5991 p->pc_count = 0; 5992 } 5993 5994 if (r_type == R_ARM_REL32) 5995 p->pc_count += 1; 5996 p->count += 1; 5997 } 5998 break; 5999 6000 /* This relocation describes the C++ object vtable hierarchy. 6001 Reconstruct it for later use during GC. */ 6002 case R_ARM_GNU_VTINHERIT: 6003 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 6004 return FALSE; 6005 break; 6006 6007 /* This relocation describes which C++ vtable entries are actually 6008 used. Record for later use during GC. */ 6009 case R_ARM_GNU_VTENTRY: 6010 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 6011 return FALSE; 6012 break; 6013 } 6014 } 6015 6016 return TRUE; 6017} 6018 6019/* Treat mapping symbols as special target symbols. */ 6020 6021static bfd_boolean 6022elf32_arm_is_target_special_symbol (bfd * abfd ATTRIBUTE_UNUSED, asymbol * sym) 6023{ 6024 return bfd_is_arm_mapping_symbol_name (sym->name); 6025} 6026 6027/* This is a copy of elf_find_function() from elf.c except that 6028 ARM mapping symbols are ignored when looking for function names 6029 and STT_ARM_TFUNC is considered to a function type. */ 6030 6031static bfd_boolean 6032arm_elf_find_function (bfd * abfd ATTRIBUTE_UNUSED, 6033 asection * section, 6034 asymbol ** symbols, 6035 bfd_vma offset, 6036 const char ** filename_ptr, 6037 const char ** functionname_ptr) 6038{ 6039 const char * filename = NULL; 6040 asymbol * func = NULL; 6041 bfd_vma low_func = 0; 6042 asymbol ** p; 6043 6044 for (p = symbols; *p != NULL; p++) 6045 { 6046 elf_symbol_type *q; 6047 6048 q = (elf_symbol_type *) *p; 6049 6050 switch (ELF_ST_TYPE (q->internal_elf_sym.st_info)) 6051 { 6052 default: 6053 break; 6054 case STT_FILE: 6055 filename = bfd_asymbol_name (&q->symbol); 6056 break; 6057 case STT_FUNC: 6058 case STT_ARM_TFUNC: 6059 case STT_NOTYPE: 6060 /* Skip $a and $t symbols. */ 6061 if ((q->symbol.flags & BSF_LOCAL) 6062 && bfd_is_arm_mapping_symbol_name (q->symbol.name)) 6063 continue; 6064 /* Fall through. */ 6065 if (bfd_get_section (&q->symbol) == section 6066 && q->symbol.value >= low_func 6067 && q->symbol.value <= offset) 6068 { 6069 func = (asymbol *) q; 6070 low_func = q->symbol.value; 6071 } 6072 break; 6073 } 6074 } 6075 6076 if (func == NULL) 6077 return FALSE; 6078 6079 if (filename_ptr) 6080 *filename_ptr = filename; 6081 if (functionname_ptr) 6082 *functionname_ptr = bfd_asymbol_name (func); 6083 6084 return TRUE; 6085} 6086 6087 6088/* Find the nearest line to a particular section and offset, for error 6089 reporting. This code is a duplicate of the code in elf.c, except 6090 that it uses arm_elf_find_function. */ 6091 6092static bfd_boolean 6093elf32_arm_find_nearest_line (bfd * abfd, 6094 asection * section, 6095 asymbol ** symbols, 6096 bfd_vma offset, 6097 const char ** filename_ptr, 6098 const char ** functionname_ptr, 6099 unsigned int * line_ptr) 6100{ 6101 bfd_boolean found = FALSE; 6102 6103 /* We skip _bfd_dwarf1_find_nearest_line since no known ARM toolchain uses it. */ 6104 6105 if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset, 6106 filename_ptr, functionname_ptr, 6107 line_ptr, 0, 6108 & elf_tdata (abfd)->dwarf2_find_line_info)) 6109 { 6110 if (!*functionname_ptr) 6111 arm_elf_find_function (abfd, section, symbols, offset, 6112 *filename_ptr ? NULL : filename_ptr, 6113 functionname_ptr); 6114 6115 return TRUE; 6116 } 6117 6118 if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, 6119 & found, filename_ptr, 6120 functionname_ptr, line_ptr, 6121 & elf_tdata (abfd)->line_info)) 6122 return FALSE; 6123 6124 if (found && (*functionname_ptr || *line_ptr)) 6125 return TRUE; 6126 6127 if (symbols == NULL) 6128 return FALSE; 6129 6130 if (! arm_elf_find_function (abfd, section, symbols, offset, 6131 filename_ptr, functionname_ptr)) 6132 return FALSE; 6133 6134 *line_ptr = 0; 6135 return TRUE; 6136} 6137 6138static bfd_boolean 6139elf32_arm_find_inliner_info (bfd * abfd, 6140 const char ** filename_ptr, 6141 const char ** functionname_ptr, 6142 unsigned int * line_ptr) 6143{ 6144 bfd_boolean found; 6145 found = _bfd_dwarf2_find_inliner_info (abfd, filename_ptr, 6146 functionname_ptr, line_ptr, 6147 & elf_tdata (abfd)->dwarf2_find_line_info); 6148 return found; 6149} 6150 6151/* Adjust a symbol defined by a dynamic object and referenced by a 6152 regular object. The current definition is in some section of the 6153 dynamic object, but we're not including those sections. We have to 6154 change the definition to something the rest of the link can 6155 understand. */ 6156 6157static bfd_boolean 6158elf32_arm_adjust_dynamic_symbol (struct bfd_link_info * info, 6159 struct elf_link_hash_entry * h) 6160{ 6161 bfd * dynobj; 6162 asection * s; 6163 unsigned int power_of_two; 6164 struct elf32_arm_link_hash_entry * eh; 6165 struct elf32_arm_link_hash_table *globals; 6166 6167 globals = elf32_arm_hash_table (info); 6168 dynobj = elf_hash_table (info)->dynobj; 6169 6170 /* Make sure we know what is going on here. */ 6171 BFD_ASSERT (dynobj != NULL 6172 && (h->needs_plt 6173 || h->u.weakdef != NULL 6174 || (h->def_dynamic 6175 && h->ref_regular 6176 && !h->def_regular))); 6177 6178 eh = (struct elf32_arm_link_hash_entry *) h; 6179 6180 /* If this is a function, put it in the procedure linkage table. We 6181 will fill in the contents of the procedure linkage table later, 6182 when we know the address of the .got section. */ 6183 if (h->type == STT_FUNC || h->type == STT_ARM_TFUNC 6184 || h->needs_plt) 6185 { 6186 if (h->plt.refcount <= 0 6187 || SYMBOL_CALLS_LOCAL (info, h) 6188 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 6189 && h->root.type == bfd_link_hash_undefweak)) 6190 { 6191 /* This case can occur if we saw a PLT32 reloc in an input 6192 file, but the symbol was never referred to by a dynamic 6193 object, or if all references were garbage collected. In 6194 such a case, we don't actually need to build a procedure 6195 linkage table, and we can just do a PC24 reloc instead. */ 6196 h->plt.offset = (bfd_vma) -1; 6197 eh->plt_thumb_refcount = 0; 6198 h->needs_plt = 0; 6199 } 6200 6201 return TRUE; 6202 } 6203 else 6204 { 6205 /* It's possible that we incorrectly decided a .plt reloc was 6206 needed for an R_ARM_PC24 or similar reloc to a non-function sym 6207 in check_relocs. We can't decide accurately between function 6208 and non-function syms in check-relocs; Objects loaded later in 6209 the link may change h->type. So fix it now. */ 6210 h->plt.offset = (bfd_vma) -1; 6211 eh->plt_thumb_refcount = 0; 6212 } 6213 6214 /* If this is a weak symbol, and there is a real definition, the 6215 processor independent code will have arranged for us to see the 6216 real definition first, and we can just use the same value. */ 6217 if (h->u.weakdef != NULL) 6218 { 6219 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 6220 || h->u.weakdef->root.type == bfd_link_hash_defweak); 6221 h->root.u.def.section = h->u.weakdef->root.u.def.section; 6222 h->root.u.def.value = h->u.weakdef->root.u.def.value; 6223 return TRUE; 6224 } 6225 6226 /* If there are no non-GOT references, we do not need a copy 6227 relocation. */ 6228 if (!h->non_got_ref) 6229 return TRUE; 6230 6231 /* This is a reference to a symbol defined by a dynamic object which 6232 is not a function. */ 6233 6234 /* If we are creating a shared library, we must presume that the 6235 only references to the symbol are via the global offset table. 6236 For such cases we need not do anything here; the relocations will 6237 be handled correctly by relocate_section. Relocatable executables 6238 can reference data in shared objects directly, so we don't need to 6239 do anything here. */ 6240 if (info->shared || globals->root.is_relocatable_executable) 6241 return TRUE; 6242 6243 if (h->size == 0) 6244 { 6245 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 6246 h->root.root.string); 6247 return TRUE; 6248 } 6249 6250 /* We must allocate the symbol in our .dynbss section, which will 6251 become part of the .bss section of the executable. There will be 6252 an entry for this symbol in the .dynsym section. The dynamic 6253 object will contain position independent code, so all references 6254 from the dynamic object to this symbol will go through the global 6255 offset table. The dynamic linker will use the .dynsym entry to 6256 determine the address it must put in the global offset table, so 6257 both the dynamic object and the regular object will refer to the 6258 same memory location for the variable. */ 6259 s = bfd_get_section_by_name (dynobj, ".dynbss"); 6260 BFD_ASSERT (s != NULL); 6261 6262 /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to 6263 copy the initial value out of the dynamic object and into the 6264 runtime process image. We need to remember the offset into the 6265 .rel(a).bss section we are going to use. */ 6266 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 6267 { 6268 asection *srel; 6269 6270 srel = bfd_get_section_by_name (dynobj, RELOC_SECTION (globals, ".bss")); 6271 BFD_ASSERT (srel != NULL); 6272 srel->size += RELOC_SIZE (globals); 6273 h->needs_copy = 1; 6274 } 6275 6276 /* We need to figure out the alignment required for this symbol. I 6277 have no idea how ELF linkers handle this. */ 6278 power_of_two = bfd_log2 (h->size); 6279 if (power_of_two > 3) 6280 power_of_two = 3; 6281 6282 /* Apply the required alignment. */ 6283 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 6284 if (power_of_two > bfd_get_section_alignment (dynobj, s)) 6285 { 6286 if (! bfd_set_section_alignment (dynobj, s, power_of_two)) 6287 return FALSE; 6288 } 6289 6290 /* Define the symbol as being at this point in the section. */ 6291 h->root.u.def.section = s; 6292 h->root.u.def.value = s->size; 6293 6294 /* Increment the section size to make room for the symbol. */ 6295 s->size += h->size; 6296 6297 return TRUE; 6298} 6299 6300/* Allocate space in .plt, .got and associated reloc sections for 6301 dynamic relocs. */ 6302 6303static bfd_boolean 6304allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) 6305{ 6306 struct bfd_link_info *info; 6307 struct elf32_arm_link_hash_table *htab; 6308 struct elf32_arm_link_hash_entry *eh; 6309 struct elf32_arm_relocs_copied *p; 6310 6311 eh = (struct elf32_arm_link_hash_entry *) h; 6312 6313 if (h->root.type == bfd_link_hash_indirect) 6314 return TRUE; 6315 6316 if (h->root.type == bfd_link_hash_warning) 6317 /* When warning symbols are created, they **replace** the "real" 6318 entry in the hash table, thus we never get to see the real 6319 symbol in a hash traversal. So look at it now. */ 6320 h = (struct elf_link_hash_entry *) h->root.u.i.link; 6321 6322 info = (struct bfd_link_info *) inf; 6323 htab = elf32_arm_hash_table (info); 6324 6325 if (htab->root.dynamic_sections_created 6326 && h->plt.refcount > 0) 6327 { 6328 /* Make sure this symbol is output as a dynamic symbol. 6329 Undefined weak syms won't yet be marked as dynamic. */ 6330 if (h->dynindx == -1 6331 && !h->forced_local) 6332 { 6333 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 6334 return FALSE; 6335 } 6336 6337 if (info->shared 6338 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 6339 { 6340 asection *s = htab->splt; 6341 6342 /* If this is the first .plt entry, make room for the special 6343 first entry. */ 6344 if (s->size == 0) 6345 s->size += htab->plt_header_size; 6346 6347 h->plt.offset = s->size; 6348 6349 /* If we will insert a Thumb trampoline before this PLT, leave room 6350 for it. */ 6351 if (!htab->use_blx && eh->plt_thumb_refcount > 0) 6352 { 6353 h->plt.offset += PLT_THUMB_STUB_SIZE; 6354 s->size += PLT_THUMB_STUB_SIZE; 6355 } 6356 6357 /* If this symbol is not defined in a regular file, and we are 6358 not generating a shared library, then set the symbol to this 6359 location in the .plt. This is required to make function 6360 pointers compare as equal between the normal executable and 6361 the shared library. */ 6362 if (! info->shared 6363 && !h->def_regular) 6364 { 6365 h->root.u.def.section = s; 6366 h->root.u.def.value = h->plt.offset; 6367 6368 /* Make sure the function is not marked as Thumb, in case 6369 it is the target of an ABS32 relocation, which will 6370 point to the PLT entry. */ 6371 if (ELF_ST_TYPE (h->type) == STT_ARM_TFUNC) 6372 h->type = ELF_ST_INFO (ELF_ST_BIND (h->type), STT_FUNC); 6373 } 6374 6375 /* Make room for this entry. */ 6376 s->size += htab->plt_entry_size; 6377 6378 if (!htab->symbian_p) 6379 { 6380 /* We also need to make an entry in the .got.plt section, which 6381 will be placed in the .got section by the linker script. */ 6382 eh->plt_got_offset = htab->sgotplt->size; 6383 htab->sgotplt->size += 4; 6384 } 6385 6386 /* We also need to make an entry in the .rel(a).plt section. */ 6387 htab->srelplt->size += RELOC_SIZE (htab); 6388 6389 /* VxWorks executables have a second set of relocations for 6390 each PLT entry. They go in a separate relocation section, 6391 which is processed by the kernel loader. */ 6392 if (htab->vxworks_p && !info->shared) 6393 { 6394 /* There is a relocation for the initial PLT entry: 6395 an R_ARM_32 relocation for _GLOBAL_OFFSET_TABLE_. */ 6396 if (h->plt.offset == htab->plt_header_size) 6397 htab->srelplt2->size += RELOC_SIZE (htab); 6398 6399 /* There are two extra relocations for each subsequent 6400 PLT entry: an R_ARM_32 relocation for the GOT entry, 6401 and an R_ARM_32 relocation for the PLT entry. */ 6402 htab->srelplt2->size += RELOC_SIZE (htab) * 2; 6403 } 6404 } 6405 else 6406 { 6407 h->plt.offset = (bfd_vma) -1; 6408 h->needs_plt = 0; 6409 } 6410 } 6411 else 6412 { 6413 h->plt.offset = (bfd_vma) -1; 6414 h->needs_plt = 0; 6415 } 6416 6417 if (h->got.refcount > 0) 6418 { 6419 asection *s; 6420 bfd_boolean dyn; 6421 int tls_type = elf32_arm_hash_entry (h)->tls_type; 6422 int indx; 6423 6424 /* Make sure this symbol is output as a dynamic symbol. 6425 Undefined weak syms won't yet be marked as dynamic. */ 6426 if (h->dynindx == -1 6427 && !h->forced_local) 6428 { 6429 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 6430 return FALSE; 6431 } 6432 6433 if (!htab->symbian_p) 6434 { 6435 s = htab->sgot; 6436 h->got.offset = s->size; 6437 6438 if (tls_type == GOT_UNKNOWN) 6439 abort (); 6440 6441 if (tls_type == GOT_NORMAL) 6442 /* Non-TLS symbols need one GOT slot. */ 6443 s->size += 4; 6444 else 6445 { 6446 if (tls_type & GOT_TLS_GD) 6447 /* R_ARM_TLS_GD32 needs 2 consecutive GOT slots. */ 6448 s->size += 8; 6449 if (tls_type & GOT_TLS_IE) 6450 /* R_ARM_TLS_IE32 needs one GOT slot. */ 6451 s->size += 4; 6452 } 6453 6454 dyn = htab->root.dynamic_sections_created; 6455 6456 indx = 0; 6457 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 6458 && (!info->shared 6459 || !SYMBOL_REFERENCES_LOCAL (info, h))) 6460 indx = h->dynindx; 6461 6462 if (tls_type != GOT_NORMAL 6463 && (info->shared || indx != 0) 6464 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 6465 || h->root.type != bfd_link_hash_undefweak)) 6466 { 6467 if (tls_type & GOT_TLS_IE) 6468 htab->srelgot->size += RELOC_SIZE (htab); 6469 6470 if (tls_type & GOT_TLS_GD) 6471 htab->srelgot->size += RELOC_SIZE (htab); 6472 6473 if ((tls_type & GOT_TLS_GD) && indx != 0) 6474 htab->srelgot->size += RELOC_SIZE (htab); 6475 } 6476 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 6477 || h->root.type != bfd_link_hash_undefweak) 6478 && (info->shared 6479 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 6480 htab->srelgot->size += RELOC_SIZE (htab); 6481 } 6482 } 6483 else 6484 h->got.offset = (bfd_vma) -1; 6485 6486 if (eh->relocs_copied == NULL) 6487 return TRUE; 6488 6489 /* In the shared -Bsymbolic case, discard space allocated for 6490 dynamic pc-relative relocs against symbols which turn out to be 6491 defined in regular objects. For the normal shared case, discard 6492 space for pc-relative relocs that have become local due to symbol 6493 visibility changes. */ 6494 6495 if (info->shared || htab->root.is_relocatable_executable) 6496 { 6497 /* The only reloc that uses pc_count is R_ARM_REL32, which will 6498 appear on something like ".long foo - .". We want calls to 6499 protected symbols to resolve directly to the function rather 6500 than going via the plt. If people want function pointer 6501 comparisons to work as expected then they should avoid 6502 writing assembly like ".long foo - .". */ 6503 if (SYMBOL_CALLS_LOCAL (info, h)) 6504 { 6505 struct elf32_arm_relocs_copied **pp; 6506 6507 for (pp = &eh->relocs_copied; (p = *pp) != NULL; ) 6508 { 6509 p->count -= p->pc_count; 6510 p->pc_count = 0; 6511 if (p->count == 0) 6512 *pp = p->next; 6513 else 6514 pp = &p->next; 6515 } 6516 } 6517 6518 /* Also discard relocs on undefined weak syms with non-default 6519 visibility. */ 6520 if (eh->relocs_copied != NULL 6521 && h->root.type == bfd_link_hash_undefweak) 6522 { 6523 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 6524 eh->relocs_copied = NULL; 6525 6526 /* Make sure undefined weak symbols are output as a dynamic 6527 symbol in PIEs. */ 6528 else if (h->dynindx == -1 6529 && !h->forced_local) 6530 { 6531 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 6532 return FALSE; 6533 } 6534 } 6535 6536 else if (htab->root.is_relocatable_executable && h->dynindx == -1 6537 && h->root.type == bfd_link_hash_new) 6538 { 6539 /* Output absolute symbols so that we can create relocations 6540 against them. For normal symbols we output a relocation 6541 against the section that contains them. */ 6542 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 6543 return FALSE; 6544 } 6545 6546 } 6547 else 6548 { 6549 /* For the non-shared case, discard space for relocs against 6550 symbols which turn out to need copy relocs or are not 6551 dynamic. */ 6552 6553 if (!h->non_got_ref 6554 && ((h->def_dynamic 6555 && !h->def_regular) 6556 || (htab->root.dynamic_sections_created 6557 && (h->root.type == bfd_link_hash_undefweak 6558 || h->root.type == bfd_link_hash_undefined)))) 6559 { 6560 /* Make sure this symbol is output as a dynamic symbol. 6561 Undefined weak syms won't yet be marked as dynamic. */ 6562 if (h->dynindx == -1 6563 && !h->forced_local) 6564 { 6565 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 6566 return FALSE; 6567 } 6568 6569 /* If that succeeded, we know we'll be keeping all the 6570 relocs. */ 6571 if (h->dynindx != -1) 6572 goto keep; 6573 } 6574 6575 eh->relocs_copied = NULL; 6576 6577 keep: ; 6578 } 6579 6580 /* Finally, allocate space. */ 6581 for (p = eh->relocs_copied; p != NULL; p = p->next) 6582 { 6583 asection *sreloc = elf_section_data (p->section)->sreloc; 6584 sreloc->size += p->count * RELOC_SIZE (htab); 6585 } 6586 6587 return TRUE; 6588} 6589 6590/* Find any dynamic relocs that apply to read-only sections. */ 6591 6592static bfd_boolean 6593elf32_arm_readonly_dynrelocs (struct elf_link_hash_entry *h, PTR inf) 6594{ 6595 struct elf32_arm_link_hash_entry *eh; 6596 struct elf32_arm_relocs_copied *p; 6597 6598 if (h->root.type == bfd_link_hash_warning) 6599 h = (struct elf_link_hash_entry *) h->root.u.i.link; 6600 6601 eh = (struct elf32_arm_link_hash_entry *) h; 6602 for (p = eh->relocs_copied; p != NULL; p = p->next) 6603 { 6604 asection *s = p->section; 6605 6606 if (s != NULL && (s->flags & SEC_READONLY) != 0) 6607 { 6608 struct bfd_link_info *info = (struct bfd_link_info *) inf; 6609 6610 info->flags |= DF_TEXTREL; 6611 6612 /* Not an error, just cut short the traversal. */ 6613 return FALSE; 6614 } 6615 } 6616 return TRUE; 6617} 6618 6619/* Set the sizes of the dynamic sections. */ 6620 6621static bfd_boolean 6622elf32_arm_size_dynamic_sections (bfd * output_bfd ATTRIBUTE_UNUSED, 6623 struct bfd_link_info * info) 6624{ 6625 bfd * dynobj; 6626 asection * s; 6627 bfd_boolean plt; 6628 bfd_boolean relocs; 6629 bfd *ibfd; 6630 struct elf32_arm_link_hash_table *htab; 6631 6632 htab = elf32_arm_hash_table (info); 6633 dynobj = elf_hash_table (info)->dynobj; 6634 BFD_ASSERT (dynobj != NULL); 6635 check_use_blx (htab); 6636 6637 if (elf_hash_table (info)->dynamic_sections_created) 6638 { 6639 /* Set the contents of the .interp section to the interpreter. */ 6640 if (info->executable) 6641 { 6642 s = bfd_get_section_by_name (dynobj, ".interp"); 6643 BFD_ASSERT (s != NULL); 6644 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 6645 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 6646 } 6647 } 6648 6649 /* Set up .got offsets for local syms, and space for local dynamic 6650 relocs. */ 6651 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 6652 { 6653 bfd_signed_vma *local_got; 6654 bfd_signed_vma *end_local_got; 6655 char *local_tls_type; 6656 bfd_size_type locsymcount; 6657 Elf_Internal_Shdr *symtab_hdr; 6658 asection *srel; 6659 6660 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 6661 continue; 6662 6663 for (s = ibfd->sections; s != NULL; s = s->next) 6664 { 6665 struct elf32_arm_relocs_copied *p; 6666 6667 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 6668 { 6669 if (!bfd_is_abs_section (p->section) 6670 && bfd_is_abs_section (p->section->output_section)) 6671 { 6672 /* Input section has been discarded, either because 6673 it is a copy of a linkonce section or due to 6674 linker script /DISCARD/, so we'll be discarding 6675 the relocs too. */ 6676 } 6677 else if (p->count != 0) 6678 { 6679 srel = elf_section_data (p->section)->sreloc; 6680 srel->size += p->count * RELOC_SIZE (htab); 6681 if ((p->section->output_section->flags & SEC_READONLY) != 0) 6682 info->flags |= DF_TEXTREL; 6683 } 6684 } 6685 } 6686 6687 local_got = elf_local_got_refcounts (ibfd); 6688 if (!local_got) 6689 continue; 6690 6691 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 6692 locsymcount = symtab_hdr->sh_info; 6693 end_local_got = local_got + locsymcount; 6694 local_tls_type = elf32_arm_local_got_tls_type (ibfd); 6695 s = htab->sgot; 6696 srel = htab->srelgot; 6697 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 6698 { 6699 if (*local_got > 0) 6700 { 6701 *local_got = s->size; 6702 if (*local_tls_type & GOT_TLS_GD) 6703 /* TLS_GD relocs need an 8-byte structure in the GOT. */ 6704 s->size += 8; 6705 if (*local_tls_type & GOT_TLS_IE) 6706 s->size += 4; 6707 if (*local_tls_type == GOT_NORMAL) 6708 s->size += 4; 6709 6710 if (info->shared || *local_tls_type == GOT_TLS_GD) 6711 srel->size += RELOC_SIZE (htab); 6712 } 6713 else 6714 *local_got = (bfd_vma) -1; 6715 } 6716 } 6717 6718 if (htab->tls_ldm_got.refcount > 0) 6719 { 6720 /* Allocate two GOT entries and one dynamic relocation (if necessary) 6721 for R_ARM_TLS_LDM32 relocations. */ 6722 htab->tls_ldm_got.offset = htab->sgot->size; 6723 htab->sgot->size += 8; 6724 if (info->shared) 6725 htab->srelgot->size += RELOC_SIZE (htab); 6726 } 6727 else 6728 htab->tls_ldm_got.offset = -1; 6729 6730 /* Allocate global sym .plt and .got entries, and space for global 6731 sym dynamic relocs. */ 6732 elf_link_hash_traverse (& htab->root, allocate_dynrelocs, info); 6733 6734 /* The check_relocs and adjust_dynamic_symbol entry points have 6735 determined the sizes of the various dynamic sections. Allocate 6736 memory for them. */ 6737 plt = FALSE; 6738 relocs = FALSE; 6739 for (s = dynobj->sections; s != NULL; s = s->next) 6740 { 6741 const char * name; 6742 6743 if ((s->flags & SEC_LINKER_CREATED) == 0) 6744 continue; 6745 6746 /* It's OK to base decisions on the section name, because none 6747 of the dynobj section names depend upon the input files. */ 6748 name = bfd_get_section_name (dynobj, s); 6749 6750 if (strcmp (name, ".plt") == 0) 6751 { 6752 /* Remember whether there is a PLT. */ 6753 plt = s->size != 0; 6754 } 6755 else if (strncmp (name, ".rel", 4) == 0) 6756 { 6757 if (s->size != 0) 6758 { 6759 /* Remember whether there are any reloc sections other 6760 than .rel(a).plt and .rela.plt.unloaded. */ 6761 if (s != htab->srelplt && s != htab->srelplt2) 6762 relocs = TRUE; 6763 6764 /* We use the reloc_count field as a counter if we need 6765 to copy relocs into the output file. */ 6766 s->reloc_count = 0; 6767 } 6768 } 6769 else if (strncmp (name, ".got", 4) != 0 6770 && strcmp (name, ".dynbss") != 0) 6771 { 6772 /* It's not one of our sections, so don't allocate space. */ 6773 continue; 6774 } 6775 6776 if (s->size == 0) 6777 { 6778 /* If we don't need this section, strip it from the 6779 output file. This is mostly to handle .rel(a).bss and 6780 .rel(a).plt. We must create both sections in 6781 create_dynamic_sections, because they must be created 6782 before the linker maps input sections to output 6783 sections. The linker does that before 6784 adjust_dynamic_symbol is called, and it is that 6785 function which decides whether anything needs to go 6786 into these sections. */ 6787 s->flags |= SEC_EXCLUDE; 6788 continue; 6789 } 6790 6791 if ((s->flags & SEC_HAS_CONTENTS) == 0) 6792 continue; 6793 6794 /* Allocate memory for the section contents. */ 6795 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 6796 if (s->contents == NULL) 6797 return FALSE; 6798 } 6799 6800 if (elf_hash_table (info)->dynamic_sections_created) 6801 { 6802 /* Add some entries to the .dynamic section. We fill in the 6803 values later, in elf32_arm_finish_dynamic_sections, but we 6804 must add the entries now so that we get the correct size for 6805 the .dynamic section. The DT_DEBUG entry is filled in by the 6806 dynamic linker and used by the debugger. */ 6807#define add_dynamic_entry(TAG, VAL) \ 6808 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 6809 6810 if (info->executable) 6811 { 6812 if (!add_dynamic_entry (DT_DEBUG, 0)) 6813 return FALSE; 6814 } 6815 6816 if (plt) 6817 { 6818 if ( !add_dynamic_entry (DT_PLTGOT, 0) 6819 || !add_dynamic_entry (DT_PLTRELSZ, 0) 6820 || !add_dynamic_entry (DT_PLTREL, 6821 htab->use_rel ? DT_REL : DT_RELA) 6822 || !add_dynamic_entry (DT_JMPREL, 0)) 6823 return FALSE; 6824 } 6825 6826 if (relocs) 6827 { 6828 if (htab->use_rel) 6829 { 6830 if (!add_dynamic_entry (DT_REL, 0) 6831 || !add_dynamic_entry (DT_RELSZ, 0) 6832 || !add_dynamic_entry (DT_RELENT, RELOC_SIZE (htab))) 6833 return FALSE; 6834 } 6835 else 6836 { 6837 if (!add_dynamic_entry (DT_RELA, 0) 6838 || !add_dynamic_entry (DT_RELASZ, 0) 6839 || !add_dynamic_entry (DT_RELAENT, RELOC_SIZE (htab))) 6840 return FALSE; 6841 } 6842 } 6843 6844 /* If any dynamic relocs apply to a read-only section, 6845 then we need a DT_TEXTREL entry. */ 6846 if ((info->flags & DF_TEXTREL) == 0) 6847 elf_link_hash_traverse (&htab->root, elf32_arm_readonly_dynrelocs, 6848 (PTR) info); 6849 6850 if ((info->flags & DF_TEXTREL) != 0) 6851 { 6852 if (!add_dynamic_entry (DT_TEXTREL, 0)) 6853 return FALSE; 6854 } 6855 } 6856#undef add_dynamic_entry 6857 6858 return TRUE; 6859} 6860 6861/* Finish up dynamic symbol handling. We set the contents of various 6862 dynamic sections here. */ 6863 6864static bfd_boolean 6865elf32_arm_finish_dynamic_symbol (bfd * output_bfd, struct bfd_link_info * info, 6866 struct elf_link_hash_entry * h, Elf_Internal_Sym * sym) 6867{ 6868 bfd * dynobj; 6869 struct elf32_arm_link_hash_table *htab; 6870 struct elf32_arm_link_hash_entry *eh; 6871 6872 dynobj = elf_hash_table (info)->dynobj; 6873 htab = elf32_arm_hash_table (info); 6874 eh = (struct elf32_arm_link_hash_entry *) h; 6875 6876 if (h->plt.offset != (bfd_vma) -1) 6877 { 6878 asection * splt; 6879 asection * srel; 6880 bfd_byte *loc; 6881 bfd_vma plt_index; 6882 Elf_Internal_Rela rel; 6883 6884 /* This symbol has an entry in the procedure linkage table. Set 6885 it up. */ 6886 6887 BFD_ASSERT (h->dynindx != -1); 6888 6889 splt = bfd_get_section_by_name (dynobj, ".plt"); 6890 srel = bfd_get_section_by_name (dynobj, RELOC_SECTION (htab, ".plt")); 6891 BFD_ASSERT (splt != NULL && srel != NULL); 6892 6893 /* Fill in the entry in the procedure linkage table. */ 6894 if (htab->symbian_p) 6895 { 6896 unsigned i; 6897 for (i = 0; i < htab->plt_entry_size / 4; ++i) 6898 bfd_put_32 (output_bfd, 6899 elf32_arm_symbian_plt_entry[i], 6900 splt->contents + h->plt.offset + 4 * i); 6901 6902 /* Fill in the entry in the .rel.plt section. */ 6903 rel.r_offset = (splt->output_section->vma 6904 + splt->output_offset 6905 + h->plt.offset + 4 * (i - 1)); 6906 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); 6907 6908 /* Get the index in the procedure linkage table which 6909 corresponds to this symbol. This is the index of this symbol 6910 in all the symbols for which we are making plt entries. The 6911 first entry in the procedure linkage table is reserved. */ 6912 plt_index = ((h->plt.offset - htab->plt_header_size) 6913 / htab->plt_entry_size); 6914 } 6915 else 6916 { 6917 bfd_vma got_offset, got_address, plt_address; 6918 bfd_vma got_displacement; 6919 asection * sgot; 6920 6921 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 6922 BFD_ASSERT (sgot != NULL); 6923 6924 /* Get the offset into the .got.plt table of the entry that 6925 corresponds to this function. */ 6926 got_offset = eh->plt_got_offset; 6927 6928 /* Get the index in the procedure linkage table which 6929 corresponds to this symbol. This is the index of this symbol 6930 in all the symbols for which we are making plt entries. The 6931 first three entries in .got.plt are reserved; after that 6932 symbols appear in the same order as in .plt. */ 6933 plt_index = (got_offset - 12) / 4; 6934 6935 /* Calculate the address of the GOT entry. */ 6936 got_address = (sgot->output_section->vma 6937 + sgot->output_offset 6938 + got_offset); 6939 6940 /* ...and the address of the PLT entry. */ 6941 plt_address = (splt->output_section->vma 6942 + splt->output_offset 6943 + h->plt.offset); 6944 6945 if (htab->vxworks_p && info->shared) 6946 { 6947 unsigned int i; 6948 bfd_vma val; 6949 6950 for (i = 0; i != htab->plt_entry_size / 4; i++) 6951 { 6952 val = elf32_arm_vxworks_shared_plt_entry[i]; 6953 if (i == 2) 6954 val |= got_address - sgot->output_section->vma; 6955 if (i == 5) 6956 val |= plt_index * RELOC_SIZE (htab); 6957 bfd_put_32 (output_bfd, val, 6958 htab->splt->contents + h->plt.offset + i * 4); 6959 } 6960 } 6961 else if (htab->vxworks_p) 6962 { 6963 unsigned int i; 6964 bfd_vma val; 6965 6966 for (i = 0; i != htab->plt_entry_size / 4; i++) 6967 { 6968 val = elf32_arm_vxworks_exec_plt_entry[i]; 6969 if (i == 2) 6970 val |= got_address; 6971 if (i == 4) 6972 val |= 0xffffff & -((h->plt.offset + i * 4 + 8) >> 2); 6973 if (i == 5) 6974 val |= plt_index * RELOC_SIZE (htab); 6975 bfd_put_32 (output_bfd, val, 6976 htab->splt->contents + h->plt.offset + i * 4); 6977 } 6978 6979 loc = (htab->srelplt2->contents 6980 + (plt_index * 2 + 1) * RELOC_SIZE (htab)); 6981 6982 /* Create the .rela.plt.unloaded R_ARM_ABS32 relocation 6983 referencing the GOT for this PLT entry. */ 6984 rel.r_offset = plt_address + 8; 6985 rel.r_info = ELF32_R_INFO (htab->root.hgot->indx, R_ARM_ABS32); 6986 rel.r_addend = got_offset; 6987 SWAP_RELOC_OUT (htab) (output_bfd, &rel, loc); 6988 loc += RELOC_SIZE (htab); 6989 6990 /* Create the R_ARM_ABS32 relocation referencing the 6991 beginning of the PLT for this GOT entry. */ 6992 rel.r_offset = got_address; 6993 rel.r_info = ELF32_R_INFO (htab->root.hplt->indx, R_ARM_ABS32); 6994 rel.r_addend = 0; 6995 SWAP_RELOC_OUT (htab) (output_bfd, &rel, loc); 6996 } 6997 else 6998 { 6999 /* Calculate the displacement between the PLT slot and the 7000 entry in the GOT. The eight-byte offset accounts for the 7001 value produced by adding to pc in the first instruction 7002 of the PLT stub. */ 7003 got_displacement = got_address - (plt_address + 8); 7004 7005 BFD_ASSERT ((got_displacement & 0xf0000000) == 0); 7006 7007 if (!htab->use_blx && eh->plt_thumb_refcount > 0) 7008 { 7009 bfd_put_16 (output_bfd, elf32_arm_plt_thumb_stub[0], 7010 splt->contents + h->plt.offset - 4); 7011 bfd_put_16 (output_bfd, elf32_arm_plt_thumb_stub[1], 7012 splt->contents + h->plt.offset - 2); 7013 } 7014 7015 bfd_put_32 (output_bfd, 7016 elf32_arm_plt_entry[0] 7017 | ((got_displacement & 0x0ff00000) >> 20), 7018 splt->contents + h->plt.offset + 0); 7019 bfd_put_32 (output_bfd, 7020 elf32_arm_plt_entry[1] 7021 | ((got_displacement & 0x000ff000) >> 12), 7022 splt->contents + h->plt.offset + 4); 7023 bfd_put_32 (output_bfd, 7024 elf32_arm_plt_entry[2] 7025 | (got_displacement & 0x00000fff), 7026 splt->contents + h->plt.offset + 8); 7027#ifdef FOUR_WORD_PLT 7028 bfd_put_32 (output_bfd, elf32_arm_plt_entry[3], 7029 splt->contents + h->plt.offset + 12); 7030#endif 7031 } 7032 7033 /* Fill in the entry in the global offset table. */ 7034 bfd_put_32 (output_bfd, 7035 (splt->output_section->vma 7036 + splt->output_offset), 7037 sgot->contents + got_offset); 7038 7039 /* Fill in the entry in the .rel(a).plt section. */ 7040 rel.r_addend = 0; 7041 rel.r_offset = got_address; 7042 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT); 7043 } 7044 7045 loc = srel->contents + plt_index * RELOC_SIZE (htab); 7046 SWAP_RELOC_OUT (htab) (output_bfd, &rel, loc); 7047 7048 if (!h->def_regular) 7049 { 7050 /* Mark the symbol as undefined, rather than as defined in 7051 the .plt section. Leave the value alone. */ 7052 sym->st_shndx = SHN_UNDEF; 7053 /* If the symbol is weak, we do need to clear the value. 7054 Otherwise, the PLT entry would provide a definition for 7055 the symbol even if the symbol wasn't defined anywhere, 7056 and so the symbol would never be NULL. */ 7057 if (!h->ref_regular_nonweak) 7058 sym->st_value = 0; 7059 } 7060 } 7061 7062 if (h->got.offset != (bfd_vma) -1 7063 && (elf32_arm_hash_entry (h)->tls_type & GOT_TLS_GD) == 0 7064 && (elf32_arm_hash_entry (h)->tls_type & GOT_TLS_IE) == 0) 7065 { 7066 asection * sgot; 7067 asection * srel; 7068 Elf_Internal_Rela rel; 7069 bfd_byte *loc; 7070 bfd_vma offset; 7071 7072 /* This symbol has an entry in the global offset table. Set it 7073 up. */ 7074 sgot = bfd_get_section_by_name (dynobj, ".got"); 7075 srel = bfd_get_section_by_name (dynobj, RELOC_SECTION (htab, ".got")); 7076 BFD_ASSERT (sgot != NULL && srel != NULL); 7077 7078 offset = (h->got.offset & ~(bfd_vma) 1); 7079 rel.r_addend = 0; 7080 rel.r_offset = (sgot->output_section->vma 7081 + sgot->output_offset 7082 + offset); 7083 7084 /* If this is a static link, or it is a -Bsymbolic link and the 7085 symbol is defined locally or was forced to be local because 7086 of a version file, we just want to emit a RELATIVE reloc. 7087 The entry in the global offset table will already have been 7088 initialized in the relocate_section function. */ 7089 if (info->shared 7090 && SYMBOL_REFERENCES_LOCAL (info, h)) 7091 { 7092 BFD_ASSERT((h->got.offset & 1) != 0); 7093 rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); 7094 if (!htab->use_rel) 7095 { 7096 rel.r_addend = bfd_get_32 (output_bfd, sgot->contents + offset); 7097 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + offset); 7098 } 7099 } 7100 else 7101 { 7102 BFD_ASSERT((h->got.offset & 1) == 0); 7103 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + offset); 7104 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); 7105 } 7106 7107 loc = srel->contents + srel->reloc_count++ * RELOC_SIZE (htab); 7108 SWAP_RELOC_OUT (htab) (output_bfd, &rel, loc); 7109 } 7110 7111 if (h->needs_copy) 7112 { 7113 asection * s; 7114 Elf_Internal_Rela rel; 7115 bfd_byte *loc; 7116 7117 /* This symbol needs a copy reloc. Set it up. */ 7118 BFD_ASSERT (h->dynindx != -1 7119 && (h->root.type == bfd_link_hash_defined 7120 || h->root.type == bfd_link_hash_defweak)); 7121 7122 s = bfd_get_section_by_name (h->root.u.def.section->owner, 7123 RELOC_SECTION (htab, ".bss")); 7124 BFD_ASSERT (s != NULL); 7125 7126 rel.r_addend = 0; 7127 rel.r_offset = (h->root.u.def.value 7128 + h->root.u.def.section->output_section->vma 7129 + h->root.u.def.section->output_offset); 7130 rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_COPY); 7131 loc = s->contents + s->reloc_count++ * RELOC_SIZE (htab); 7132 SWAP_RELOC_OUT (htab) (output_bfd, &rel, loc); 7133 } 7134 7135 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. On VxWorks, 7136 the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it is relative 7137 to the ".got" section. */ 7138 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 7139 || (!htab->vxworks_p && h == htab->root.hgot)) 7140 sym->st_shndx = SHN_ABS; 7141 7142 return TRUE; 7143} 7144 7145/* Finish up the dynamic sections. */ 7146 7147static bfd_boolean 7148elf32_arm_finish_dynamic_sections (bfd * output_bfd, struct bfd_link_info * info) 7149{ 7150 bfd * dynobj; 7151 asection * sgot; 7152 asection * sdyn; 7153 7154 dynobj = elf_hash_table (info)->dynobj; 7155 7156 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 7157 BFD_ASSERT (elf32_arm_hash_table (info)->symbian_p || sgot != NULL); 7158 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 7159 7160 if (elf_hash_table (info)->dynamic_sections_created) 7161 { 7162 asection *splt; 7163 Elf32_External_Dyn *dyncon, *dynconend; 7164 struct elf32_arm_link_hash_table *htab; 7165 7166 htab = elf32_arm_hash_table (info); 7167 splt = bfd_get_section_by_name (dynobj, ".plt"); 7168 BFD_ASSERT (splt != NULL && sdyn != NULL); 7169 7170 dyncon = (Elf32_External_Dyn *) sdyn->contents; 7171 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 7172 7173 for (; dyncon < dynconend; dyncon++) 7174 { 7175 Elf_Internal_Dyn dyn; 7176 const char * name; 7177 asection * s; 7178 7179 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 7180 7181 switch (dyn.d_tag) 7182 { 7183 unsigned int type; 7184 7185 default: 7186 break; 7187 7188 case DT_HASH: 7189 name = ".hash"; 7190 goto get_vma_if_bpabi; 7191 case DT_STRTAB: 7192 name = ".dynstr"; 7193 goto get_vma_if_bpabi; 7194 case DT_SYMTAB: 7195 name = ".dynsym"; 7196 goto get_vma_if_bpabi; 7197 case DT_VERSYM: 7198 name = ".gnu.version"; 7199 goto get_vma_if_bpabi; 7200 case DT_VERDEF: 7201 name = ".gnu.version_d"; 7202 goto get_vma_if_bpabi; 7203 case DT_VERNEED: 7204 name = ".gnu.version_r"; 7205 goto get_vma_if_bpabi; 7206 7207 case DT_PLTGOT: 7208 name = ".got"; 7209 goto get_vma; 7210 case DT_JMPREL: 7211 name = RELOC_SECTION (htab, ".plt"); 7212 get_vma: 7213 s = bfd_get_section_by_name (output_bfd, name); 7214 BFD_ASSERT (s != NULL); 7215 if (!htab->symbian_p) 7216 dyn.d_un.d_ptr = s->vma; 7217 else 7218 /* In the BPABI, tags in the PT_DYNAMIC section point 7219 at the file offset, not the memory address, for the 7220 convenience of the post linker. */ 7221 dyn.d_un.d_ptr = s->filepos; 7222 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 7223 break; 7224 7225 get_vma_if_bpabi: 7226 if (htab->symbian_p) 7227 goto get_vma; 7228 break; 7229 7230 case DT_PLTRELSZ: 7231 s = bfd_get_section_by_name (output_bfd, 7232 RELOC_SECTION (htab, ".plt")); 7233 BFD_ASSERT (s != NULL); 7234 dyn.d_un.d_val = s->size; 7235 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 7236 break; 7237 7238 case DT_RELSZ: 7239 case DT_RELASZ: 7240 if (!htab->symbian_p) 7241 { 7242 /* My reading of the SVR4 ABI indicates that the 7243 procedure linkage table relocs (DT_JMPREL) should be 7244 included in the overall relocs (DT_REL). This is 7245 what Solaris does. However, UnixWare can not handle 7246 that case. Therefore, we override the DT_RELSZ entry 7247 here to make it not include the JMPREL relocs. Since 7248 the linker script arranges for .rel(a).plt to follow all 7249 other relocation sections, we don't have to worry 7250 about changing the DT_REL entry. */ 7251 s = bfd_get_section_by_name (output_bfd, 7252 RELOC_SECTION (htab, ".plt")); 7253 if (s != NULL) 7254 dyn.d_un.d_val -= s->size; 7255 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 7256 break; 7257 } 7258 /* Fall through */ 7259 7260 case DT_REL: 7261 case DT_RELA: 7262 /* In the BPABI, the DT_REL tag must point at the file 7263 offset, not the VMA, of the first relocation 7264 section. So, we use code similar to that in 7265 elflink.c, but do not check for SHF_ALLOC on the 7266 relcoation section, since relocations sections are 7267 never allocated under the BPABI. The comments above 7268 about Unixware notwithstanding, we include all of the 7269 relocations here. */ 7270 if (htab->symbian_p) 7271 { 7272 unsigned int i; 7273 type = ((dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ) 7274 ? SHT_REL : SHT_RELA); 7275 dyn.d_un.d_val = 0; 7276 for (i = 1; i < elf_numsections (output_bfd); i++) 7277 { 7278 Elf_Internal_Shdr *hdr 7279 = elf_elfsections (output_bfd)[i]; 7280 if (hdr->sh_type == type) 7281 { 7282 if (dyn.d_tag == DT_RELSZ 7283 || dyn.d_tag == DT_RELASZ) 7284 dyn.d_un.d_val += hdr->sh_size; 7285 else if ((ufile_ptr) hdr->sh_offset 7286 <= dyn.d_un.d_val - 1) 7287 dyn.d_un.d_val = hdr->sh_offset; 7288 } 7289 } 7290 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 7291 } 7292 break; 7293 7294 /* Set the bottom bit of DT_INIT/FINI if the 7295 corresponding function is Thumb. */ 7296 case DT_INIT: 7297 name = info->init_function; 7298 goto get_sym; 7299 case DT_FINI: 7300 name = info->fini_function; 7301 get_sym: 7302 /* If it wasn't set by elf_bfd_final_link 7303 then there is nothing to adjust. */ 7304 if (dyn.d_un.d_val != 0) 7305 { 7306 struct elf_link_hash_entry * eh; 7307 7308 eh = elf_link_hash_lookup (elf_hash_table (info), name, 7309 FALSE, FALSE, TRUE); 7310 if (eh != (struct elf_link_hash_entry *) NULL 7311 && ELF_ST_TYPE (eh->type) == STT_ARM_TFUNC) 7312 { 7313 dyn.d_un.d_val |= 1; 7314 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 7315 } 7316 } 7317 break; 7318 } 7319 } 7320 7321 /* Fill in the first entry in the procedure linkage table. */ 7322 if (splt->size > 0 && elf32_arm_hash_table (info)->plt_header_size) 7323 { 7324 const bfd_vma *plt0_entry; 7325 bfd_vma got_address, plt_address, got_displacement; 7326 7327 /* Calculate the addresses of the GOT and PLT. */ 7328 got_address = sgot->output_section->vma + sgot->output_offset; 7329 plt_address = splt->output_section->vma + splt->output_offset; 7330 7331 if (htab->vxworks_p) 7332 { 7333 /* The VxWorks GOT is relocated by the dynamic linker. 7334 Therefore, we must emit relocations rather than simply 7335 computing the values now. */ 7336 Elf_Internal_Rela rel; 7337 7338 plt0_entry = elf32_arm_vxworks_exec_plt0_entry; 7339 bfd_put_32 (output_bfd, plt0_entry[0], splt->contents + 0); 7340 bfd_put_32 (output_bfd, plt0_entry[1], splt->contents + 4); 7341 bfd_put_32 (output_bfd, plt0_entry[2], splt->contents + 8); 7342 bfd_put_32 (output_bfd, got_address, splt->contents + 12); 7343 7344 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_. */ 7345 rel.r_offset = plt_address + 12; 7346 rel.r_info = ELF32_R_INFO (htab->root.hgot->indx, R_ARM_ABS32); 7347 rel.r_addend = 0; 7348 SWAP_RELOC_OUT (htab) (output_bfd, &rel, 7349 htab->srelplt2->contents); 7350 } 7351 else 7352 { 7353 got_displacement = got_address - (plt_address + 16); 7354 7355 plt0_entry = elf32_arm_plt0_entry; 7356 bfd_put_32 (output_bfd, plt0_entry[0], splt->contents + 0); 7357 bfd_put_32 (output_bfd, plt0_entry[1], splt->contents + 4); 7358 bfd_put_32 (output_bfd, plt0_entry[2], splt->contents + 8); 7359 bfd_put_32 (output_bfd, plt0_entry[3], splt->contents + 12); 7360 7361#ifdef FOUR_WORD_PLT 7362 /* The displacement value goes in the otherwise-unused 7363 last word of the second entry. */ 7364 bfd_put_32 (output_bfd, got_displacement, splt->contents + 28); 7365#else 7366 bfd_put_32 (output_bfd, got_displacement, splt->contents + 16); 7367#endif 7368 } 7369 } 7370 7371 /* UnixWare sets the entsize of .plt to 4, although that doesn't 7372 really seem like the right value. */ 7373 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; 7374 7375 if (htab->vxworks_p && !info->shared && htab->splt->size > 0) 7376 { 7377 /* Correct the .rel(a).plt.unloaded relocations. They will have 7378 incorrect symbol indexes. */ 7379 int num_plts; 7380 unsigned char *p; 7381 7382 num_plts = ((htab->splt->size - htab->plt_header_size) 7383 / htab->plt_entry_size); 7384 p = htab->srelplt2->contents + RELOC_SIZE (htab); 7385 7386 for (; num_plts; num_plts--) 7387 { 7388 Elf_Internal_Rela rel; 7389 7390 SWAP_RELOC_IN (htab) (output_bfd, p, &rel); 7391 rel.r_info = ELF32_R_INFO (htab->root.hgot->indx, R_ARM_ABS32); 7392 SWAP_RELOC_OUT (htab) (output_bfd, &rel, p); 7393 p += RELOC_SIZE (htab); 7394 7395 SWAP_RELOC_IN (htab) (output_bfd, p, &rel); 7396 rel.r_info = ELF32_R_INFO (htab->root.hplt->indx, R_ARM_ABS32); 7397 SWAP_RELOC_OUT (htab) (output_bfd, &rel, p); 7398 p += RELOC_SIZE (htab); 7399 } 7400 } 7401 } 7402 7403 /* Fill in the first three entries in the global offset table. */ 7404 if (sgot) 7405 { 7406 if (sgot->size > 0) 7407 { 7408 if (sdyn == NULL) 7409 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 7410 else 7411 bfd_put_32 (output_bfd, 7412 sdyn->output_section->vma + sdyn->output_offset, 7413 sgot->contents); 7414 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 7415 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 7416 } 7417 7418 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 7419 } 7420 7421 return TRUE; 7422} 7423 7424static void 7425elf32_arm_post_process_headers (bfd * abfd, struct bfd_link_info * link_info ATTRIBUTE_UNUSED) 7426{ 7427 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */ 7428 struct elf32_arm_link_hash_table *globals; 7429 7430 i_ehdrp = elf_elfheader (abfd); 7431 7432 if (EF_ARM_EABI_VERSION (i_ehdrp->e_flags) == EF_ARM_EABI_UNKNOWN) 7433 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_ARM; 7434 else 7435 i_ehdrp->e_ident[EI_OSABI] = 0; 7436 i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION; 7437 7438 if (link_info) 7439 { 7440 globals = elf32_arm_hash_table (link_info); 7441 if (globals->byteswap_code) 7442 i_ehdrp->e_flags |= EF_ARM_BE8; 7443 } 7444} 7445 7446static enum elf_reloc_type_class 7447elf32_arm_reloc_type_class (const Elf_Internal_Rela *rela) 7448{ 7449 switch ((int) ELF32_R_TYPE (rela->r_info)) 7450 { 7451 case R_ARM_RELATIVE: 7452 return reloc_class_relative; 7453 case R_ARM_JUMP_SLOT: 7454 return reloc_class_plt; 7455 case R_ARM_COPY: 7456 return reloc_class_copy; 7457 default: 7458 return reloc_class_normal; 7459 } 7460} 7461 7462/* Set the right machine number for an Arm ELF file. */ 7463 7464static bfd_boolean 7465elf32_arm_section_flags (flagword *flags, const Elf_Internal_Shdr *hdr) 7466{ 7467 if (hdr->sh_type == SHT_NOTE) 7468 *flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_SAME_CONTENTS; 7469 7470 return TRUE; 7471} 7472 7473static void 7474elf32_arm_final_write_processing (bfd *abfd, bfd_boolean linker ATTRIBUTE_UNUSED) 7475{ 7476 bfd_arm_update_notes (abfd, ARM_NOTE_SECTION); 7477} 7478 7479/* Return TRUE if this is an unwinding table entry. */ 7480 7481static bfd_boolean 7482is_arm_elf_unwind_section_name (bfd * abfd ATTRIBUTE_UNUSED, const char * name) 7483{ 7484 size_t len1, len2; 7485 7486 len1 = sizeof (ELF_STRING_ARM_unwind) - 1; 7487 len2 = sizeof (ELF_STRING_ARM_unwind_once) - 1; 7488 return (strncmp (name, ELF_STRING_ARM_unwind, len1) == 0 7489 || strncmp (name, ELF_STRING_ARM_unwind_once, len2) == 0); 7490} 7491 7492 7493/* Set the type and flags for an ARM section. We do this by 7494 the section name, which is a hack, but ought to work. */ 7495 7496static bfd_boolean 7497elf32_arm_fake_sections (bfd * abfd, Elf_Internal_Shdr * hdr, asection * sec) 7498{ 7499 const char * name; 7500 7501 name = bfd_get_section_name (abfd, sec); 7502 7503 if (is_arm_elf_unwind_section_name (abfd, name)) 7504 { 7505 hdr->sh_type = SHT_ARM_EXIDX; 7506 hdr->sh_flags |= SHF_LINK_ORDER; 7507 } 7508 else if (strcmp(name, ".ARM.attributes") == 0) 7509 { 7510 hdr->sh_type = SHT_ARM_ATTRIBUTES; 7511 } 7512 return TRUE; 7513} 7514 7515/* Parse an Arm EABI attributes section. */ 7516static void 7517elf32_arm_parse_attributes (bfd *abfd, Elf_Internal_Shdr * hdr) 7518{ 7519 bfd_byte *contents; 7520 bfd_byte *p; 7521 bfd_vma len; 7522 7523 contents = bfd_malloc (hdr->sh_size); 7524 if (!contents) 7525 return; 7526 if (!bfd_get_section_contents (abfd, hdr->bfd_section, contents, 0, 7527 hdr->sh_size)) 7528 { 7529 free (contents); 7530 return; 7531 } 7532 p = contents; 7533 if (*(p++) == 'A') 7534 { 7535 len = hdr->sh_size - 1; 7536 while (len > 0) 7537 { 7538 int namelen; 7539 bfd_vma section_len; 7540 7541 section_len = bfd_get_32 (abfd, p); 7542 p += 4; 7543 if (section_len > len) 7544 section_len = len; 7545 len -= section_len; 7546 namelen = strlen ((char *)p) + 1; 7547 section_len -= namelen + 4; 7548 if (strcmp((char *)p, "aeabi") != 0) 7549 { 7550 /* Vendor section. Ignore it. */ 7551 p += namelen + section_len; 7552 } 7553 else 7554 { 7555 p += namelen; 7556 while (section_len > 0) 7557 { 7558 int tag; 7559 unsigned int n; 7560 unsigned int val; 7561 bfd_vma subsection_len; 7562 bfd_byte *end; 7563 7564 tag = read_unsigned_leb128 (abfd, p, &n); 7565 p += n; 7566 subsection_len = bfd_get_32 (abfd, p); 7567 p += 4; 7568 if (subsection_len > section_len) 7569 subsection_len = section_len; 7570 section_len -= subsection_len; 7571 subsection_len -= n + 4; 7572 end = p + subsection_len; 7573 switch (tag) 7574 { 7575 case Tag_File: 7576 while (p < end) 7577 { 7578 bfd_boolean is_string; 7579 7580 tag = read_unsigned_leb128 (abfd, p, &n); 7581 p += n; 7582 if (tag == 4 || tag == 5) 7583 is_string = 1; 7584 else if (tag < 32) 7585 is_string = 0; 7586 else 7587 is_string = (tag & 1) != 0; 7588 if (tag == Tag_compatibility) 7589 { 7590 val = read_unsigned_leb128 (abfd, p, &n); 7591 p += n; 7592 elf32_arm_add_eabi_attr_compat (abfd, val, 7593 (char *)p); 7594 p += strlen ((char *)p) + 1; 7595 } 7596 else if (is_string) 7597 { 7598 elf32_arm_add_eabi_attr_string (abfd, tag, 7599 (char *)p); 7600 p += strlen ((char *)p) + 1; 7601 } 7602 else 7603 { 7604 val = read_unsigned_leb128 (abfd, p, &n); 7605 p += n; 7606 elf32_arm_add_eabi_attr_int (abfd, tag, val); 7607 } 7608 } 7609 break; 7610 case Tag_Section: 7611 case Tag_Symbol: 7612 /* Don't have anywhere convenient to attach these. 7613 Fall through for now. */ 7614 default: 7615 /* Ignore things we don't kow about. */ 7616 p += subsection_len; 7617 subsection_len = 0; 7618 break; 7619 } 7620 } 7621 } 7622 } 7623 } 7624 free (contents); 7625} 7626 7627/* Handle an ARM specific section when reading an object file. This is 7628 called when bfd_section_from_shdr finds a section with an unknown 7629 type. */ 7630 7631static bfd_boolean 7632elf32_arm_section_from_shdr (bfd *abfd, 7633 Elf_Internal_Shdr * hdr, 7634 const char *name, 7635 int shindex) 7636{ 7637 /* There ought to be a place to keep ELF backend specific flags, but 7638 at the moment there isn't one. We just keep track of the 7639 sections by their name, instead. Fortunately, the ABI gives 7640 names for all the ARM specific sections, so we will probably get 7641 away with this. */ 7642 switch (hdr->sh_type) 7643 { 7644 case SHT_ARM_EXIDX: 7645 case SHT_ARM_PREEMPTMAP: 7646 case SHT_ARM_ATTRIBUTES: 7647 break; 7648 7649 default: 7650 return FALSE; 7651 } 7652 7653 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) 7654 return FALSE; 7655 7656 if (hdr->sh_type == SHT_ARM_ATTRIBUTES) 7657 elf32_arm_parse_attributes(abfd, hdr); 7658 return TRUE; 7659} 7660 7661/* A structure used to record a list of sections, independently 7662 of the next and prev fields in the asection structure. */ 7663typedef struct section_list 7664{ 7665 asection * sec; 7666 struct section_list * next; 7667 struct section_list * prev; 7668} 7669section_list; 7670 7671/* Unfortunately we need to keep a list of sections for which 7672 an _arm_elf_section_data structure has been allocated. This 7673 is because it is possible for functions like elf32_arm_write_section 7674 to be called on a section which has had an elf_data_structure 7675 allocated for it (and so the used_by_bfd field is valid) but 7676 for which the ARM extended version of this structure - the 7677 _arm_elf_section_data structure - has not been allocated. */ 7678static section_list * sections_with_arm_elf_section_data = NULL; 7679 7680static void 7681record_section_with_arm_elf_section_data (asection * sec) 7682{ 7683 struct section_list * entry; 7684 7685 entry = bfd_malloc (sizeof (* entry)); 7686 if (entry == NULL) 7687 return; 7688 entry->sec = sec; 7689 entry->next = sections_with_arm_elf_section_data; 7690 entry->prev = NULL; 7691 if (entry->next != NULL) 7692 entry->next->prev = entry; 7693 sections_with_arm_elf_section_data = entry; 7694} 7695 7696static struct section_list * 7697find_arm_elf_section_entry (asection * sec) 7698{ 7699 struct section_list * entry; 7700 static struct section_list * last_entry = NULL; 7701 7702 /* This is a short cut for the typical case where the sections are added 7703 to the sections_with_arm_elf_section_data list in forward order and 7704 then looked up here in backwards order. This makes a real difference 7705 to the ld-srec/sec64k.exp linker test. */ 7706 entry = sections_with_arm_elf_section_data; 7707 if (last_entry != NULL) 7708 { 7709 if (last_entry->sec == sec) 7710 entry = last_entry; 7711 else if (last_entry->next != NULL 7712 && last_entry->next->sec == sec) 7713 entry = last_entry->next; 7714 } 7715 7716 for (; entry; entry = entry->next) 7717 if (entry->sec == sec) 7718 break; 7719 7720 if (entry) 7721 /* Record the entry prior to this one - it is the entry we are most 7722 likely to want to locate next time. Also this way if we have been 7723 called from unrecord_section_with_arm_elf_section_data() we will not 7724 be caching a pointer that is about to be freed. */ 7725 last_entry = entry->prev; 7726 7727 return entry; 7728} 7729 7730static _arm_elf_section_data * 7731get_arm_elf_section_data (asection * sec) 7732{ 7733 struct section_list * entry; 7734 7735 entry = find_arm_elf_section_entry (sec); 7736 7737 if (entry) 7738 return elf32_arm_section_data (entry->sec); 7739 else 7740 return NULL; 7741} 7742 7743static void 7744unrecord_section_with_arm_elf_section_data (asection * sec) 7745{ 7746 struct section_list * entry; 7747 7748 entry = find_arm_elf_section_entry (sec); 7749 7750 if (entry) 7751 { 7752 if (entry->prev != NULL) 7753 entry->prev->next = entry->next; 7754 if (entry->next != NULL) 7755 entry->next->prev = entry->prev; 7756 if (entry == sections_with_arm_elf_section_data) 7757 sections_with_arm_elf_section_data = entry->next; 7758 free (entry); 7759 } 7760} 7761 7762/* Called for each symbol. Builds a section map based on mapping symbols. 7763 Does not alter any of the symbols. */ 7764 7765static bfd_boolean 7766elf32_arm_output_symbol_hook (struct bfd_link_info *info, 7767 const char *name, 7768 Elf_Internal_Sym *elfsym, 7769 asection *input_sec, 7770 struct elf_link_hash_entry *h) 7771{ 7772 int mapcount; 7773 elf32_arm_section_map *map; 7774 elf32_arm_section_map *newmap; 7775 _arm_elf_section_data *arm_data; 7776 struct elf32_arm_link_hash_table *globals; 7777 7778 globals = elf32_arm_hash_table (info); 7779 if (globals->vxworks_p 7780 && !elf_vxworks_link_output_symbol_hook (info, name, elfsym, 7781 input_sec, h)) 7782 return FALSE; 7783 7784 /* Only do this on final link. */ 7785 if (info->relocatable) 7786 return TRUE; 7787 7788 /* Only build a map if we need to byteswap code. */ 7789 if (!globals->byteswap_code) 7790 return TRUE; 7791 7792 /* We only want mapping symbols. */ 7793 if (! bfd_is_arm_mapping_symbol_name (name)) 7794 return TRUE; 7795 7796 /* If this section has not been allocated an _arm_elf_section_data 7797 structure then we cannot record anything. */ 7798 arm_data = get_arm_elf_section_data (input_sec); 7799 if (arm_data == NULL) 7800 return TRUE; 7801 7802 mapcount = arm_data->mapcount + 1; 7803 map = arm_data->map; 7804 7805 /* TODO: This may be inefficient, but we probably don't usually have many 7806 mapping symbols per section. */ 7807 newmap = bfd_realloc (map, mapcount * sizeof (* map)); 7808 if (newmap != NULL) 7809 { 7810 arm_data->map = newmap; 7811 arm_data->mapcount = mapcount; 7812 7813 newmap[mapcount - 1].vma = elfsym->st_value; 7814 newmap[mapcount - 1].type = name[1]; 7815 } 7816 7817 return TRUE; 7818} 7819 7820/* Allocate target specific section data. */ 7821 7822static bfd_boolean 7823elf32_arm_new_section_hook (bfd *abfd, asection *sec) 7824{ 7825 _arm_elf_section_data *sdata; 7826 bfd_size_type amt = sizeof (*sdata); 7827 7828 sdata = bfd_zalloc (abfd, amt); 7829 if (sdata == NULL) 7830 return FALSE; 7831 sec->used_by_bfd = sdata; 7832 7833 record_section_with_arm_elf_section_data (sec); 7834 7835 return _bfd_elf_new_section_hook (abfd, sec); 7836} 7837 7838 7839/* Used to order a list of mapping symbols by address. */ 7840 7841static int 7842elf32_arm_compare_mapping (const void * a, const void * b) 7843{ 7844 return ((const elf32_arm_section_map *) a)->vma 7845 > ((const elf32_arm_section_map *) b)->vma; 7846} 7847 7848 7849/* Do code byteswapping. Return FALSE afterwards so that the section is 7850 written out as normal. */ 7851 7852static bfd_boolean 7853elf32_arm_write_section (bfd *output_bfd ATTRIBUTE_UNUSED, asection *sec, 7854 bfd_byte *contents) 7855{ 7856 int mapcount; 7857 _arm_elf_section_data *arm_data; 7858 elf32_arm_section_map *map; 7859 bfd_vma ptr; 7860 bfd_vma end; 7861 bfd_vma offset; 7862 bfd_byte tmp; 7863 int i; 7864 7865 /* If this section has not been allocated an _arm_elf_section_data 7866 structure then we cannot record anything. */ 7867 arm_data = get_arm_elf_section_data (sec); 7868 if (arm_data == NULL) 7869 return FALSE; 7870 7871 mapcount = arm_data->mapcount; 7872 map = arm_data->map; 7873 7874 if (mapcount == 0) 7875 return FALSE; 7876 7877 qsort (map, mapcount, sizeof (* map), elf32_arm_compare_mapping); 7878 7879 offset = sec->output_section->vma + sec->output_offset; 7880 ptr = map[0].vma - offset; 7881 for (i = 0; i < mapcount; i++) 7882 { 7883 if (i == mapcount - 1) 7884 end = sec->size; 7885 else 7886 end = map[i + 1].vma - offset; 7887 7888 switch (map[i].type) 7889 { 7890 case 'a': 7891 /* Byte swap code words. */ 7892 while (ptr + 3 < end) 7893 { 7894 tmp = contents[ptr]; 7895 contents[ptr] = contents[ptr + 3]; 7896 contents[ptr + 3] = tmp; 7897 tmp = contents[ptr + 1]; 7898 contents[ptr + 1] = contents[ptr + 2]; 7899 contents[ptr + 2] = tmp; 7900 ptr += 4; 7901 } 7902 break; 7903 7904 case 't': 7905 /* Byte swap code halfwords. */ 7906 while (ptr + 1 < end) 7907 { 7908 tmp = contents[ptr]; 7909 contents[ptr] = contents[ptr + 1]; 7910 contents[ptr + 1] = tmp; 7911 ptr += 2; 7912 } 7913 break; 7914 7915 case 'd': 7916 /* Leave data alone. */ 7917 break; 7918 } 7919 ptr = end; 7920 } 7921 7922 free (map); 7923 arm_data->mapcount = 0; 7924 arm_data->map = NULL; 7925 unrecord_section_with_arm_elf_section_data (sec); 7926 7927 return FALSE; 7928} 7929 7930static void 7931unrecord_section_via_map_over_sections (bfd * abfd ATTRIBUTE_UNUSED, 7932 asection * sec, 7933 void * ignore ATTRIBUTE_UNUSED) 7934{ 7935 unrecord_section_with_arm_elf_section_data (sec); 7936} 7937 7938static bfd_boolean 7939elf32_arm_close_and_cleanup (bfd * abfd) 7940{ 7941 bfd_map_over_sections (abfd, unrecord_section_via_map_over_sections, NULL); 7942 7943 return _bfd_elf_close_and_cleanup (abfd); 7944} 7945 7946/* Display STT_ARM_TFUNC symbols as functions. */ 7947 7948static void 7949elf32_arm_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, 7950 asymbol *asym) 7951{ 7952 elf_symbol_type *elfsym = (elf_symbol_type *) asym; 7953 7954 if (ELF_ST_TYPE (elfsym->internal_elf_sym.st_info) == STT_ARM_TFUNC) 7955 elfsym->symbol.flags |= BSF_FUNCTION; 7956} 7957 7958 7959/* Mangle thumb function symbols as we read them in. */ 7960 7961static void 7962elf32_arm_swap_symbol_in (bfd * abfd, 7963 const void *psrc, 7964 const void *pshn, 7965 Elf_Internal_Sym *dst) 7966{ 7967 bfd_elf32_swap_symbol_in (abfd, psrc, pshn, dst); 7968 7969 /* New EABI objects mark thumb function symbols by setting the low bit of 7970 the address. Turn these into STT_ARM_TFUNC. */ 7971 if (ELF_ST_TYPE (dst->st_info) == STT_FUNC 7972 && (dst->st_value & 1)) 7973 { 7974 dst->st_info = ELF_ST_INFO (ELF_ST_BIND (dst->st_info), STT_ARM_TFUNC); 7975 dst->st_value &= ~(bfd_vma) 1; 7976 } 7977} 7978 7979 7980/* Mangle thumb function symbols as we write them out. */ 7981 7982static void 7983elf32_arm_swap_symbol_out (bfd *abfd, 7984 const Elf_Internal_Sym *src, 7985 void *cdst, 7986 void *shndx) 7987{ 7988 Elf_Internal_Sym newsym; 7989 7990 /* We convert STT_ARM_TFUNC symbols into STT_FUNC with the low bit 7991 of the address set, as per the new EABI. We do this unconditionally 7992 because objcopy does not set the elf header flags until after 7993 it writes out the symbol table. */ 7994 if (ELF_ST_TYPE (src->st_info) == STT_ARM_TFUNC) 7995 { 7996 newsym = *src; 7997 newsym.st_info = ELF_ST_INFO (ELF_ST_BIND (src->st_info), STT_FUNC); 7998 newsym.st_value |= 1; 7999 8000 src = &newsym; 8001 } 8002 bfd_elf32_swap_symbol_out (abfd, src, cdst, shndx); 8003} 8004 8005/* Add the PT_ARM_EXIDX program header. */ 8006 8007static bfd_boolean 8008elf32_arm_modify_segment_map (bfd *abfd, 8009 struct bfd_link_info *info ATTRIBUTE_UNUSED) 8010{ 8011 struct elf_segment_map *m; 8012 asection *sec; 8013 8014 sec = bfd_get_section_by_name (abfd, ".ARM.exidx"); 8015 if (sec != NULL && (sec->flags & SEC_LOAD) != 0) 8016 { 8017 /* If there is already a PT_ARM_EXIDX header, then we do not 8018 want to add another one. This situation arises when running 8019 "strip"; the input binary already has the header. */ 8020 m = elf_tdata (abfd)->segment_map; 8021 while (m && m->p_type != PT_ARM_EXIDX) 8022 m = m->next; 8023 if (!m) 8024 { 8025 m = bfd_zalloc (abfd, sizeof (struct elf_segment_map)); 8026 if (m == NULL) 8027 return FALSE; 8028 m->p_type = PT_ARM_EXIDX; 8029 m->count = 1; 8030 m->sections[0] = sec; 8031 8032 m->next = elf_tdata (abfd)->segment_map; 8033 elf_tdata (abfd)->segment_map = m; 8034 } 8035 } 8036 8037 return TRUE; 8038} 8039 8040/* We may add a PT_ARM_EXIDX program header. */ 8041 8042static int 8043elf32_arm_additional_program_headers (bfd *abfd) 8044{ 8045 asection *sec; 8046 8047 sec = bfd_get_section_by_name (abfd, ".ARM.exidx"); 8048 if (sec != NULL && (sec->flags & SEC_LOAD) != 0) 8049 return 1; 8050 else 8051 return 0; 8052} 8053 8054/* We use this to override swap_symbol_in and swap_symbol_out. */ 8055const struct elf_size_info elf32_arm_size_info = { 8056 sizeof (Elf32_External_Ehdr), 8057 sizeof (Elf32_External_Phdr), 8058 sizeof (Elf32_External_Shdr), 8059 sizeof (Elf32_External_Rel), 8060 sizeof (Elf32_External_Rela), 8061 sizeof (Elf32_External_Sym), 8062 sizeof (Elf32_External_Dyn), 8063 sizeof (Elf_External_Note), 8064 4, 8065 1, 8066 32, 2, 8067 ELFCLASS32, EV_CURRENT, 8068 bfd_elf32_write_out_phdrs, 8069 bfd_elf32_write_shdrs_and_ehdr, 8070 bfd_elf32_write_relocs, 8071 elf32_arm_swap_symbol_in, 8072 elf32_arm_swap_symbol_out, 8073 bfd_elf32_slurp_reloc_table, 8074 bfd_elf32_slurp_symbol_table, 8075 bfd_elf32_swap_dyn_in, 8076 bfd_elf32_swap_dyn_out, 8077 bfd_elf32_swap_reloc_in, 8078 bfd_elf32_swap_reloc_out, 8079 bfd_elf32_swap_reloca_in, 8080 bfd_elf32_swap_reloca_out 8081}; 8082 8083#define ELF_ARCH bfd_arch_arm 8084#define ELF_MACHINE_CODE EM_ARM 8085#ifdef __QNXTARGET__ 8086#define ELF_MAXPAGESIZE 0x1000 8087#else 8088#define ELF_MAXPAGESIZE 0x8000 8089#endif 8090#define ELF_MINPAGESIZE 0x1000 8091 8092#define bfd_elf32_mkobject elf32_arm_mkobject 8093 8094#define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data 8095#define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data 8096#define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags 8097#define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data 8098#define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create 8099#define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup 8100#define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line 8101#define bfd_elf32_find_inliner_info elf32_arm_find_inliner_info 8102#define bfd_elf32_new_section_hook elf32_arm_new_section_hook 8103#define bfd_elf32_bfd_is_target_special_symbol elf32_arm_is_target_special_symbol 8104#define bfd_elf32_close_and_cleanup elf32_arm_close_and_cleanup 8105#define bfd_elf32_bfd_final_link elf32_arm_bfd_final_link 8106 8107#define elf_backend_get_symbol_type elf32_arm_get_symbol_type 8108#define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook 8109#define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook 8110#define elf_backend_check_relocs elf32_arm_check_relocs 8111#define elf_backend_relocate_section elf32_arm_relocate_section 8112#define elf_backend_write_section elf32_arm_write_section 8113#define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol 8114#define elf_backend_create_dynamic_sections elf32_arm_create_dynamic_sections 8115#define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol 8116#define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections 8117#define elf_backend_link_output_symbol_hook elf32_arm_output_symbol_hook 8118#define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections 8119#define elf_backend_post_process_headers elf32_arm_post_process_headers 8120#define elf_backend_reloc_type_class elf32_arm_reloc_type_class 8121#define elf_backend_object_p elf32_arm_object_p 8122#define elf_backend_section_flags elf32_arm_section_flags 8123#define elf_backend_fake_sections elf32_arm_fake_sections 8124#define elf_backend_section_from_shdr elf32_arm_section_from_shdr 8125#define elf_backend_final_write_processing elf32_arm_final_write_processing 8126#define elf_backend_copy_indirect_symbol elf32_arm_copy_indirect_symbol 8127#define elf_backend_symbol_processing elf32_arm_symbol_processing 8128#define elf_backend_size_info elf32_arm_size_info 8129#define elf_backend_modify_segment_map elf32_arm_modify_segment_map 8130#define elf_backend_additional_program_headers \ 8131 elf32_arm_additional_program_headers 8132 8133#define elf_backend_can_refcount 1 8134#define elf_backend_can_gc_sections 1 8135#define elf_backend_plt_readonly 1 8136#define elf_backend_want_got_plt 1 8137#define elf_backend_want_plt_sym 0 8138#define elf_backend_may_use_rel_p 1 8139#define elf_backend_may_use_rela_p 0 8140#define elf_backend_default_use_rela_p 0 8141#define elf_backend_rela_normal 0 8142 8143#define elf_backend_got_header_size 12 8144 8145#include "elf32-target.h" 8146 8147/* VxWorks Targets */ 8148 8149#undef TARGET_LITTLE_SYM 8150#define TARGET_LITTLE_SYM bfd_elf32_littlearm_vxworks_vec 8151#undef TARGET_LITTLE_NAME 8152#define TARGET_LITTLE_NAME "elf32-littlearm-vxworks" 8153#undef TARGET_BIG_SYM 8154#define TARGET_BIG_SYM bfd_elf32_bigarm_vxworks_vec 8155#undef TARGET_BIG_NAME 8156#define TARGET_BIG_NAME "elf32-bigarm-vxworks" 8157 8158/* Like elf32_arm_link_hash_table_create -- but overrides 8159 appropriately for VxWorks. */ 8160static struct bfd_link_hash_table * 8161elf32_arm_vxworks_link_hash_table_create (bfd *abfd) 8162{ 8163 struct bfd_link_hash_table *ret; 8164 8165 ret = elf32_arm_link_hash_table_create (abfd); 8166 if (ret) 8167 { 8168 struct elf32_arm_link_hash_table *htab 8169 = (struct elf32_arm_link_hash_table *) ret; 8170 htab->use_rel = 0; 8171 htab->vxworks_p = 1; 8172 } 8173 return ret; 8174} 8175 8176static void 8177elf32_arm_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker) 8178{ 8179 elf32_arm_final_write_processing (abfd, linker); 8180 elf_vxworks_final_write_processing (abfd, linker); 8181} 8182 8183#undef elf32_bed 8184#define elf32_bed elf32_arm_vxworks_bed 8185 8186#undef bfd_elf32_bfd_link_hash_table_create 8187#define bfd_elf32_bfd_link_hash_table_create \ 8188 elf32_arm_vxworks_link_hash_table_create 8189#undef elf_backend_add_symbol_hook 8190#define elf_backend_add_symbol_hook \ 8191 elf_vxworks_add_symbol_hook 8192#undef elf_backend_final_write_processing 8193#define elf_backend_final_write_processing \ 8194 elf32_arm_vxworks_final_write_processing 8195#undef elf_backend_emit_relocs 8196#define elf_backend_emit_relocs \ 8197 elf_vxworks_emit_relocs 8198 8199#undef elf_backend_may_use_rel_p 8200#define elf_backend_may_use_rel_p 0 8201#undef elf_backend_may_use_rela_p 8202#define elf_backend_may_use_rela_p 1 8203#undef elf_backend_default_use_rela_p 8204#define elf_backend_default_use_rela_p 1 8205#undef elf_backend_rela_normal 8206#define elf_backend_rela_normal 1 8207#undef elf_backend_want_plt_sym 8208#define elf_backend_want_plt_sym 1 8209#undef ELF_MAXPAGESIZE 8210#define ELF_MAXPAGESIZE 0x1000 8211 8212#include "elf32-target.h" 8213 8214 8215/* Symbian OS Targets */ 8216 8217#undef TARGET_LITTLE_SYM 8218#define TARGET_LITTLE_SYM bfd_elf32_littlearm_symbian_vec 8219#undef TARGET_LITTLE_NAME 8220#define TARGET_LITTLE_NAME "elf32-littlearm-symbian" 8221#undef TARGET_BIG_SYM 8222#define TARGET_BIG_SYM bfd_elf32_bigarm_symbian_vec 8223#undef TARGET_BIG_NAME 8224#define TARGET_BIG_NAME "elf32-bigarm-symbian" 8225 8226/* Like elf32_arm_link_hash_table_create -- but overrides 8227 appropriately for Symbian OS. */ 8228static struct bfd_link_hash_table * 8229elf32_arm_symbian_link_hash_table_create (bfd *abfd) 8230{ 8231 struct bfd_link_hash_table *ret; 8232 8233 ret = elf32_arm_link_hash_table_create (abfd); 8234 if (ret) 8235 { 8236 struct elf32_arm_link_hash_table *htab 8237 = (struct elf32_arm_link_hash_table *)ret; 8238 /* There is no PLT header for Symbian OS. */ 8239 htab->plt_header_size = 0; 8240 /* The PLT entries are each three instructions. */ 8241 htab->plt_entry_size = 4 * NUM_ELEM (elf32_arm_symbian_plt_entry); 8242 htab->symbian_p = 1; 8243 /* Symbian uses armv5t or above, so use_blx is always true. */ 8244 htab->use_blx = 1; 8245 htab->root.is_relocatable_executable = 1; 8246 } 8247 return ret; 8248} 8249 8250static const struct bfd_elf_special_section 8251elf32_arm_symbian_special_sections[] = 8252{ 8253 /* In a BPABI executable, the dynamic linking sections do not go in 8254 the loadable read-only segment. The post-linker may wish to 8255 refer to these sections, but they are not part of the final 8256 program image. */ 8257 { ".dynamic", 8, 0, SHT_DYNAMIC, 0 }, 8258 { ".dynstr", 7, 0, SHT_STRTAB, 0 }, 8259 { ".dynsym", 7, 0, SHT_DYNSYM, 0 }, 8260 { ".got", 4, 0, SHT_PROGBITS, 0 }, 8261 { ".hash", 5, 0, SHT_HASH, 0 }, 8262 /* These sections do not need to be writable as the SymbianOS 8263 postlinker will arrange things so that no dynamic relocation is 8264 required. */ 8265 { ".init_array", 11, 0, SHT_INIT_ARRAY, SHF_ALLOC }, 8266 { ".fini_array", 11, 0, SHT_FINI_ARRAY, SHF_ALLOC }, 8267 { ".preinit_array", 14, 0, SHT_PREINIT_ARRAY, SHF_ALLOC }, 8268 { NULL, 0, 0, 0, 0 } 8269}; 8270 8271static void 8272elf32_arm_symbian_begin_write_processing (bfd *abfd, 8273 struct bfd_link_info *link_info 8274 ATTRIBUTE_UNUSED) 8275{ 8276 /* BPABI objects are never loaded directly by an OS kernel; they are 8277 processed by a postlinker first, into an OS-specific format. If 8278 the D_PAGED bit is set on the file, BFD will align segments on 8279 page boundaries, so that an OS can directly map the file. With 8280 BPABI objects, that just results in wasted space. In addition, 8281 because we clear the D_PAGED bit, map_sections_to_segments will 8282 recognize that the program headers should not be mapped into any 8283 loadable segment. */ 8284 abfd->flags &= ~D_PAGED; 8285} 8286 8287static bfd_boolean 8288elf32_arm_symbian_modify_segment_map (bfd *abfd, 8289 struct bfd_link_info *info) 8290{ 8291 struct elf_segment_map *m; 8292 asection *dynsec; 8293 8294 /* BPABI shared libraries and executables should have a PT_DYNAMIC 8295 segment. However, because the .dynamic section is not marked 8296 with SEC_LOAD, the generic ELF code will not create such a 8297 segment. */ 8298 dynsec = bfd_get_section_by_name (abfd, ".dynamic"); 8299 if (dynsec) 8300 { 8301 m = _bfd_elf_make_dynamic_segment (abfd, dynsec); 8302 m->next = elf_tdata (abfd)->segment_map; 8303 elf_tdata (abfd)->segment_map = m; 8304 } 8305 8306 /* Also call the generic arm routine. */ 8307 return elf32_arm_modify_segment_map (abfd, info); 8308} 8309 8310#undef elf32_bed 8311#define elf32_bed elf32_arm_symbian_bed 8312 8313/* The dynamic sections are not allocated on SymbianOS; the postlinker 8314 will process them and then discard them. */ 8315#undef ELF_DYNAMIC_SEC_FLAGS 8316#define ELF_DYNAMIC_SEC_FLAGS \ 8317 (SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED) 8318 8319#undef bfd_elf32_bfd_link_hash_table_create 8320#define bfd_elf32_bfd_link_hash_table_create \ 8321 elf32_arm_symbian_link_hash_table_create 8322#undef elf_backend_add_symbol_hook 8323 8324#undef elf_backend_special_sections 8325#define elf_backend_special_sections elf32_arm_symbian_special_sections 8326 8327#undef elf_backend_begin_write_processing 8328#define elf_backend_begin_write_processing \ 8329 elf32_arm_symbian_begin_write_processing 8330#undef elf_backend_final_write_processing 8331#define elf_backend_final_write_processing \ 8332 elf32_arm_final_write_processing 8333#undef elf_backend_emit_relocs 8334 8335#undef elf_backend_modify_segment_map 8336#define elf_backend_modify_segment_map elf32_arm_symbian_modify_segment_map 8337 8338/* There is no .got section for BPABI objects, and hence no header. */ 8339#undef elf_backend_got_header_size 8340#define elf_backend_got_header_size 0 8341 8342/* Similarly, there is no .got.plt section. */ 8343#undef elf_backend_want_got_plt 8344#define elf_backend_want_got_plt 0 8345 8346#undef elf_backend_may_use_rel_p 8347#define elf_backend_may_use_rel_p 1 8348#undef elf_backend_may_use_rela_p 8349#define elf_backend_may_use_rela_p 0 8350#undef elf_backend_default_use_rela_p 8351#define elf_backend_default_use_rela_p 0 8352#undef elf_backend_rela_normal 8353#define elf_backend_rela_normal 0 8354#undef elf_backend_want_plt_sym 8355#define elf_backend_want_plt_sym 0 8356#undef ELF_MAXPAGESIZE 8357#define ELF_MAXPAGESIZE 0x8000 8358 8359#include "elf32-target.h" 8360