elf32-ppc.c revision 60484
1/* PowerPC-specific support for 32-bit ELF 2 Copyright 1994, 95, 96, 97, 98, 1999 Free Software Foundation, Inc. 3 Written by Ian Lance Taylor, Cygnus Support. 4 5This file is part of BFD, the Binary File Descriptor library. 6 7This program is free software; you can redistribute it and/or modify 8it under the terms of the GNU General Public License as published by 9the Free Software Foundation; either version 2 of the License, or 10(at your option) any later version. 11 12This program is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15GNU General Public License for more details. 16 17You should have received a copy of the GNU General Public License 18along with this program; if not, write to the Free Software 19Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 20 21/* This file is based on a preliminary PowerPC ELF ABI. The 22 information may not match the final PowerPC ELF ABI. It includes 23 suggestions from the in-progress Embedded PowerPC ABI, and that 24 information may also not match. */ 25 26#include "bfd.h" 27#include "sysdep.h" 28#include "bfdlink.h" 29#include "libbfd.h" 30#include "elf-bfd.h" 31#include "elf/ppc.h" 32 33#define USE_RELA /* we want RELA relocations, not REL */ 34 35 36static reloc_howto_type *ppc_elf_reloc_type_lookup 37 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); 38static void ppc_elf_info_to_howto 39 PARAMS ((bfd *abfd, arelent *cache_ptr, Elf32_Internal_Rela *dst)); 40static void ppc_elf_howto_init PARAMS ((void)); 41static bfd_reloc_status_type ppc_elf_addr16_ha_reloc 42 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 43static boolean ppc_elf_set_private_flags PARAMS ((bfd *, flagword)); 44static boolean ppc_elf_copy_private_bfd_data PARAMS ((bfd *, bfd *)); 45static boolean ppc_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *)); 46 47static int ppc_elf_additional_program_headers PARAMS ((bfd *)); 48static boolean ppc_elf_modify_segment_map PARAMS ((bfd *)); 49 50static boolean ppc_elf_create_dynamic_sections 51 PARAMS ((bfd *, struct bfd_link_info *)); 52 53static boolean ppc_elf_section_from_shdr PARAMS ((bfd *, 54 Elf32_Internal_Shdr *, 55 char *)); 56static boolean ppc_elf_fake_sections 57 PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *)); 58 59static elf_linker_section_t *ppc_elf_create_linker_section 60 PARAMS ((bfd *abfd, 61 struct bfd_link_info *info, 62 enum elf_linker_section_enum)); 63 64static boolean ppc_elf_check_relocs PARAMS ((bfd *, 65 struct bfd_link_info *, 66 asection *, 67 const Elf_Internal_Rela *)); 68 69static asection * ppc_elf_gc_mark_hook PARAMS ((bfd *abfd, 70 struct bfd_link_info *info, 71 Elf_Internal_Rela *rel, 72 struct elf_link_hash_entry *h, 73 Elf_Internal_Sym *sym)); 74 75static boolean ppc_elf_gc_sweep_hook PARAMS ((bfd *abfd, 76 struct bfd_link_info *info, 77 asection *sec, 78 const Elf_Internal_Rela *relocs)); 79 80static boolean ppc_elf_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *, 81 struct elf_link_hash_entry *)); 82 83static boolean ppc_elf_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); 84 85static boolean ppc_elf_relocate_section PARAMS ((bfd *, 86 struct bfd_link_info *info, 87 bfd *, 88 asection *, 89 bfd_byte *, 90 Elf_Internal_Rela *relocs, 91 Elf_Internal_Sym *local_syms, 92 asection **)); 93 94static boolean ppc_elf_add_symbol_hook PARAMS ((bfd *, 95 struct bfd_link_info *, 96 const Elf_Internal_Sym *, 97 const char **, 98 flagword *, 99 asection **, 100 bfd_vma *)); 101 102static boolean ppc_elf_finish_dynamic_symbol PARAMS ((bfd *, 103 struct bfd_link_info *, 104 struct elf_link_hash_entry *, 105 Elf_Internal_Sym *)); 106 107static boolean ppc_elf_finish_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); 108 109#define BRANCH_PREDICT_BIT 0x200000 /* branch prediction bit for branch taken relocs */ 110#define RA_REGISTER_MASK 0x001f0000 /* mask to set RA in memory instructions */ 111#define RA_REGISTER_SHIFT 16 /* value to shift register by to insert RA */ 112 113/* The name of the dynamic interpreter. This is put in the .interp 114 section. */ 115 116#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 117 118/* The size in bytes of an entry in the procedure linkage table. */ 119#define PLT_ENTRY_SIZE 12 120/* The initial size of the plt reserved for the dynamic linker. */ 121#define PLT_INITIAL_ENTRY_SIZE 72 122/* The size of the gap between entries in the PLT. */ 123#define PLT_SLOT_SIZE 8 124/* The number of single-slot PLT entries (the rest use two slots). */ 125#define PLT_NUM_SINGLE_ENTRIES 8192 126 127 128static reloc_howto_type *ppc_elf_howto_table[ (int)R_PPC_max ]; 129 130static reloc_howto_type ppc_elf_howto_raw[] = 131{ 132 /* This reloc does nothing. */ 133 HOWTO (R_PPC_NONE, /* type */ 134 0, /* rightshift */ 135 2, /* size (0 = byte, 1 = short, 2 = long) */ 136 32, /* bitsize */ 137 false, /* pc_relative */ 138 0, /* bitpos */ 139 complain_overflow_bitfield, /* complain_on_overflow */ 140 bfd_elf_generic_reloc, /* special_function */ 141 "R_PPC_NONE", /* name */ 142 false, /* partial_inplace */ 143 0, /* src_mask */ 144 0, /* dst_mask */ 145 false), /* pcrel_offset */ 146 147 /* A standard 32 bit relocation. */ 148 HOWTO (R_PPC_ADDR32, /* type */ 149 0, /* rightshift */ 150 2, /* size (0 = byte, 1 = short, 2 = long) */ 151 32, /* bitsize */ 152 false, /* pc_relative */ 153 0, /* bitpos */ 154 complain_overflow_bitfield, /* complain_on_overflow */ 155 bfd_elf_generic_reloc, /* special_function */ 156 "R_PPC_ADDR32", /* name */ 157 false, /* partial_inplace */ 158 0, /* src_mask */ 159 0xffffffff, /* dst_mask */ 160 false), /* pcrel_offset */ 161 162 /* An absolute 26 bit branch; the lower two bits must be zero. 163 FIXME: we don't check that, we just clear them. */ 164 HOWTO (R_PPC_ADDR24, /* type */ 165 0, /* rightshift */ 166 2, /* size (0 = byte, 1 = short, 2 = long) */ 167 26, /* bitsize */ 168 false, /* pc_relative */ 169 0, /* bitpos */ 170 complain_overflow_bitfield, /* complain_on_overflow */ 171 bfd_elf_generic_reloc, /* special_function */ 172 "R_PPC_ADDR24", /* name */ 173 false, /* partial_inplace */ 174 0, /* src_mask */ 175 0x3fffffc, /* dst_mask */ 176 false), /* pcrel_offset */ 177 178 /* A standard 16 bit relocation. */ 179 HOWTO (R_PPC_ADDR16, /* type */ 180 0, /* rightshift */ 181 1, /* size (0 = byte, 1 = short, 2 = long) */ 182 16, /* bitsize */ 183 false, /* pc_relative */ 184 0, /* bitpos */ 185 complain_overflow_bitfield, /* complain_on_overflow */ 186 bfd_elf_generic_reloc, /* special_function */ 187 "R_PPC_ADDR16", /* name */ 188 false, /* partial_inplace */ 189 0, /* src_mask */ 190 0xffff, /* dst_mask */ 191 false), /* pcrel_offset */ 192 193 /* A 16 bit relocation without overflow. */ 194 HOWTO (R_PPC_ADDR16_LO, /* type */ 195 0, /* rightshift */ 196 1, /* size (0 = byte, 1 = short, 2 = long) */ 197 16, /* bitsize */ 198 false, /* pc_relative */ 199 0, /* bitpos */ 200 complain_overflow_dont,/* complain_on_overflow */ 201 bfd_elf_generic_reloc, /* special_function */ 202 "R_PPC_ADDR16_LO", /* name */ 203 false, /* partial_inplace */ 204 0, /* src_mask */ 205 0xffff, /* dst_mask */ 206 false), /* pcrel_offset */ 207 208 /* The high order 16 bits of an address. */ 209 HOWTO (R_PPC_ADDR16_HI, /* type */ 210 16, /* rightshift */ 211 1, /* size (0 = byte, 1 = short, 2 = long) */ 212 16, /* bitsize */ 213 false, /* pc_relative */ 214 0, /* bitpos */ 215 complain_overflow_dont, /* complain_on_overflow */ 216 bfd_elf_generic_reloc, /* special_function */ 217 "R_PPC_ADDR16_HI", /* name */ 218 false, /* partial_inplace */ 219 0, /* src_mask */ 220 0xffff, /* dst_mask */ 221 false), /* pcrel_offset */ 222 223 /* The high order 16 bits of an address, plus 1 if the contents of 224 the low 16 bits, treated as a signed number, is negative. */ 225 HOWTO (R_PPC_ADDR16_HA, /* type */ 226 16, /* rightshift */ 227 1, /* size (0 = byte, 1 = short, 2 = long) */ 228 16, /* bitsize */ 229 false, /* pc_relative */ 230 0, /* bitpos */ 231 complain_overflow_dont, /* complain_on_overflow */ 232 ppc_elf_addr16_ha_reloc, /* special_function */ 233 "R_PPC_ADDR16_HA", /* name */ 234 false, /* partial_inplace */ 235 0, /* src_mask */ 236 0xffff, /* dst_mask */ 237 false), /* pcrel_offset */ 238 239 /* An absolute 16 bit branch; the lower two bits must be zero. 240 FIXME: we don't check that, we just clear them. */ 241 HOWTO (R_PPC_ADDR14, /* type */ 242 0, /* rightshift */ 243 2, /* size (0 = byte, 1 = short, 2 = long) */ 244 16, /* bitsize */ 245 false, /* pc_relative */ 246 0, /* bitpos */ 247 complain_overflow_bitfield, /* complain_on_overflow */ 248 bfd_elf_generic_reloc, /* special_function */ 249 "R_PPC_ADDR14", /* name */ 250 false, /* partial_inplace */ 251 0, /* src_mask */ 252 0xfffc, /* dst_mask */ 253 false), /* pcrel_offset */ 254 255 /* An absolute 16 bit branch, for which bit 10 should be set to 256 indicate that the branch is expected to be taken. The lower two 257 bits must be zero. */ 258 HOWTO (R_PPC_ADDR14_BRTAKEN, /* type */ 259 0, /* rightshift */ 260 2, /* size (0 = byte, 1 = short, 2 = long) */ 261 16, /* bitsize */ 262 false, /* pc_relative */ 263 0, /* bitpos */ 264 complain_overflow_bitfield, /* complain_on_overflow */ 265 bfd_elf_generic_reloc, /* special_function */ 266 "R_PPC_ADDR14_BRTAKEN",/* name */ 267 false, /* partial_inplace */ 268 0, /* src_mask */ 269 0xfffc, /* dst_mask */ 270 false), /* pcrel_offset */ 271 272 /* An absolute 16 bit branch, for which bit 10 should be set to 273 indicate that the branch is not expected to be taken. The lower 274 two bits must be zero. */ 275 HOWTO (R_PPC_ADDR14_BRNTAKEN, /* type */ 276 0, /* rightshift */ 277 2, /* size (0 = byte, 1 = short, 2 = long) */ 278 16, /* bitsize */ 279 false, /* pc_relative */ 280 0, /* bitpos */ 281 complain_overflow_bitfield, /* complain_on_overflow */ 282 bfd_elf_generic_reloc, /* special_function */ 283 "R_PPC_ADDR14_BRNTAKEN",/* name */ 284 false, /* partial_inplace */ 285 0, /* src_mask */ 286 0xfffc, /* dst_mask */ 287 false), /* pcrel_offset */ 288 289 /* A relative 26 bit branch; the lower two bits must be zero. */ 290 HOWTO (R_PPC_REL24, /* type */ 291 0, /* rightshift */ 292 2, /* size (0 = byte, 1 = short, 2 = long) */ 293 26, /* bitsize */ 294 true, /* pc_relative */ 295 0, /* bitpos */ 296 complain_overflow_signed, /* complain_on_overflow */ 297 bfd_elf_generic_reloc, /* special_function */ 298 "R_PPC_REL24", /* name */ 299 false, /* partial_inplace */ 300 0, /* src_mask */ 301 0x3fffffc, /* dst_mask */ 302 true), /* pcrel_offset */ 303 304 /* A relative 16 bit branch; the lower two bits must be zero. */ 305 HOWTO (R_PPC_REL14, /* type */ 306 0, /* rightshift */ 307 2, /* size (0 = byte, 1 = short, 2 = long) */ 308 16, /* bitsize */ 309 true, /* pc_relative */ 310 0, /* bitpos */ 311 complain_overflow_signed, /* complain_on_overflow */ 312 bfd_elf_generic_reloc, /* special_function */ 313 "R_PPC_REL14", /* name */ 314 false, /* partial_inplace */ 315 0, /* src_mask */ 316 0xfffc, /* dst_mask */ 317 true), /* pcrel_offset */ 318 319 /* A relative 16 bit branch. Bit 10 should be set to indicate that 320 the branch is expected to be taken. The lower two bits must be 321 zero. */ 322 HOWTO (R_PPC_REL14_BRTAKEN, /* type */ 323 0, /* rightshift */ 324 2, /* size (0 = byte, 1 = short, 2 = long) */ 325 16, /* bitsize */ 326 true, /* pc_relative */ 327 0, /* bitpos */ 328 complain_overflow_signed, /* complain_on_overflow */ 329 bfd_elf_generic_reloc, /* special_function */ 330 "R_PPC_REL14_BRTAKEN", /* name */ 331 false, /* partial_inplace */ 332 0, /* src_mask */ 333 0xfffc, /* dst_mask */ 334 true), /* pcrel_offset */ 335 336 /* A relative 16 bit branch. Bit 10 should be set to indicate that 337 the branch is not expected to be taken. The lower two bits must 338 be zero. */ 339 HOWTO (R_PPC_REL14_BRNTAKEN, /* type */ 340 0, /* rightshift */ 341 2, /* size (0 = byte, 1 = short, 2 = long) */ 342 16, /* bitsize */ 343 true, /* pc_relative */ 344 0, /* bitpos */ 345 complain_overflow_signed, /* complain_on_overflow */ 346 bfd_elf_generic_reloc, /* special_function */ 347 "R_PPC_REL14_BRNTAKEN",/* name */ 348 false, /* partial_inplace */ 349 0, /* src_mask */ 350 0xfffc, /* dst_mask */ 351 true), /* pcrel_offset */ 352 353 /* Like R_PPC_ADDR16, but referring to the GOT table entry for the 354 symbol. */ 355 HOWTO (R_PPC_GOT16, /* type */ 356 0, /* rightshift */ 357 1, /* size (0 = byte, 1 = short, 2 = long) */ 358 16, /* bitsize */ 359 false, /* pc_relative */ 360 0, /* bitpos */ 361 complain_overflow_signed, /* complain_on_overflow */ 362 bfd_elf_generic_reloc, /* special_function */ 363 "R_PPC_GOT16", /* name */ 364 false, /* partial_inplace */ 365 0, /* src_mask */ 366 0xffff, /* dst_mask */ 367 false), /* pcrel_offset */ 368 369 /* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for 370 the symbol. */ 371 HOWTO (R_PPC_GOT16_LO, /* type */ 372 0, /* rightshift */ 373 1, /* size (0 = byte, 1 = short, 2 = long) */ 374 16, /* bitsize */ 375 false, /* pc_relative */ 376 0, /* bitpos */ 377 complain_overflow_dont, /* complain_on_overflow */ 378 bfd_elf_generic_reloc, /* special_function */ 379 "R_PPC_GOT16_LO", /* name */ 380 false, /* partial_inplace */ 381 0, /* src_mask */ 382 0xffff, /* dst_mask */ 383 false), /* pcrel_offset */ 384 385 /* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for 386 the symbol. */ 387 HOWTO (R_PPC_GOT16_HI, /* type */ 388 16, /* rightshift */ 389 1, /* size (0 = byte, 1 = short, 2 = long) */ 390 16, /* bitsize */ 391 false, /* pc_relative */ 392 0, /* bitpos */ 393 complain_overflow_bitfield, /* complain_on_overflow */ 394 bfd_elf_generic_reloc, /* special_function */ 395 "R_PPC_GOT16_HI", /* name */ 396 false, /* partial_inplace */ 397 0, /* src_mask */ 398 0xffff, /* dst_mask */ 399 false), /* pcrel_offset */ 400 401 /* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for 402 the symbol. */ 403 HOWTO (R_PPC_GOT16_HA, /* type */ 404 16, /* rightshift */ 405 1, /* size (0 = byte, 1 = short, 2 = long) */ 406 16, /* bitsize */ 407 false, /* pc_relative */ 408 0, /* bitpos */ 409 complain_overflow_bitfield, /* complain_on_overflow */ 410 ppc_elf_addr16_ha_reloc, /* special_function */ 411 "R_PPC_GOT16_HA", /* name */ 412 false, /* partial_inplace */ 413 0, /* src_mask */ 414 0xffff, /* dst_mask */ 415 false), /* pcrel_offset */ 416 417 /* Like R_PPC_REL24, but referring to the procedure linkage table 418 entry for the symbol. */ 419 HOWTO (R_PPC_PLTREL24, /* type */ 420 0, /* rightshift */ 421 2, /* size (0 = byte, 1 = short, 2 = long) */ 422 26, /* bitsize */ 423 true, /* pc_relative */ 424 0, /* bitpos */ 425 complain_overflow_signed, /* complain_on_overflow */ 426 bfd_elf_generic_reloc, /* special_function */ 427 "R_PPC_PLTREL24", /* name */ 428 false, /* partial_inplace */ 429 0, /* src_mask */ 430 0x3fffffc, /* dst_mask */ 431 true), /* pcrel_offset */ 432 433 /* This is used only by the dynamic linker. The symbol should exist 434 both in the object being run and in some shared library. The 435 dynamic linker copies the data addressed by the symbol from the 436 shared library into the object, because the object being 437 run has to have the data at some particular address. */ 438 HOWTO (R_PPC_COPY, /* type */ 439 0, /* rightshift */ 440 2, /* size (0 = byte, 1 = short, 2 = long) */ 441 32, /* bitsize */ 442 false, /* pc_relative */ 443 0, /* bitpos */ 444 complain_overflow_bitfield, /* complain_on_overflow */ 445 bfd_elf_generic_reloc, /* special_function */ 446 "R_PPC_COPY", /* name */ 447 false, /* partial_inplace */ 448 0, /* src_mask */ 449 0, /* dst_mask */ 450 false), /* pcrel_offset */ 451 452 /* Like R_PPC_ADDR32, but used when setting global offset table 453 entries. */ 454 HOWTO (R_PPC_GLOB_DAT, /* type */ 455 0, /* rightshift */ 456 2, /* size (0 = byte, 1 = short, 2 = long) */ 457 32, /* bitsize */ 458 false, /* pc_relative */ 459 0, /* bitpos */ 460 complain_overflow_bitfield, /* complain_on_overflow */ 461 bfd_elf_generic_reloc, /* special_function */ 462 "R_PPC_GLOB_DAT", /* name */ 463 false, /* partial_inplace */ 464 0, /* src_mask */ 465 0xffffffff, /* dst_mask */ 466 false), /* pcrel_offset */ 467 468 /* Marks a procedure linkage table entry for a symbol. */ 469 HOWTO (R_PPC_JMP_SLOT, /* type */ 470 0, /* rightshift */ 471 2, /* size (0 = byte, 1 = short, 2 = long) */ 472 32, /* bitsize */ 473 false, /* pc_relative */ 474 0, /* bitpos */ 475 complain_overflow_bitfield, /* complain_on_overflow */ 476 bfd_elf_generic_reloc, /* special_function */ 477 "R_PPC_JMP_SLOT", /* name */ 478 false, /* partial_inplace */ 479 0, /* src_mask */ 480 0, /* dst_mask */ 481 false), /* pcrel_offset */ 482 483 /* Used only by the dynamic linker. When the object is run, this 484 longword is set to the load address of the object, plus the 485 addend. */ 486 HOWTO (R_PPC_RELATIVE, /* type */ 487 0, /* rightshift */ 488 2, /* size (0 = byte, 1 = short, 2 = long) */ 489 32, /* bitsize */ 490 false, /* pc_relative */ 491 0, /* bitpos */ 492 complain_overflow_bitfield, /* complain_on_overflow */ 493 bfd_elf_generic_reloc, /* special_function */ 494 "R_PPC_RELATIVE", /* name */ 495 false, /* partial_inplace */ 496 0, /* src_mask */ 497 0xffffffff, /* dst_mask */ 498 false), /* pcrel_offset */ 499 500 /* Like R_PPC_REL24, but uses the value of the symbol within the 501 object rather than the final value. Normally used for 502 _GLOBAL_OFFSET_TABLE_. */ 503 HOWTO (R_PPC_LOCAL24PC, /* type */ 504 0, /* rightshift */ 505 2, /* size (0 = byte, 1 = short, 2 = long) */ 506 26, /* bitsize */ 507 true, /* pc_relative */ 508 0, /* bitpos */ 509 complain_overflow_signed, /* complain_on_overflow */ 510 bfd_elf_generic_reloc, /* special_function */ 511 "R_PPC_LOCAL24PC", /* name */ 512 false, /* partial_inplace */ 513 0, /* src_mask */ 514 0x3fffffc, /* dst_mask */ 515 true), /* pcrel_offset */ 516 517 /* Like R_PPC_ADDR32, but may be unaligned. */ 518 HOWTO (R_PPC_UADDR32, /* type */ 519 0, /* rightshift */ 520 2, /* size (0 = byte, 1 = short, 2 = long) */ 521 32, /* bitsize */ 522 false, /* pc_relative */ 523 0, /* bitpos */ 524 complain_overflow_bitfield, /* complain_on_overflow */ 525 bfd_elf_generic_reloc, /* special_function */ 526 "R_PPC_UADDR32", /* name */ 527 false, /* partial_inplace */ 528 0, /* src_mask */ 529 0xffffffff, /* dst_mask */ 530 false), /* pcrel_offset */ 531 532 /* Like R_PPC_ADDR16, but may be unaligned. */ 533 HOWTO (R_PPC_UADDR16, /* type */ 534 0, /* rightshift */ 535 1, /* size (0 = byte, 1 = short, 2 = long) */ 536 16, /* bitsize */ 537 false, /* pc_relative */ 538 0, /* bitpos */ 539 complain_overflow_bitfield, /* complain_on_overflow */ 540 bfd_elf_generic_reloc, /* special_function */ 541 "R_PPC_UADDR16", /* name */ 542 false, /* partial_inplace */ 543 0, /* src_mask */ 544 0xffff, /* dst_mask */ 545 false), /* pcrel_offset */ 546 547 /* 32-bit PC relative */ 548 HOWTO (R_PPC_REL32, /* type */ 549 0, /* rightshift */ 550 2, /* size (0 = byte, 1 = short, 2 = long) */ 551 32, /* bitsize */ 552 true, /* pc_relative */ 553 0, /* bitpos */ 554 complain_overflow_bitfield, /* complain_on_overflow */ 555 bfd_elf_generic_reloc, /* special_function */ 556 "R_PPC_REL32", /* name */ 557 false, /* partial_inplace */ 558 0, /* src_mask */ 559 0xffffffff, /* dst_mask */ 560 true), /* pcrel_offset */ 561 562 /* 32-bit relocation to the symbol's procedure linkage table. 563 FIXME: not supported. */ 564 HOWTO (R_PPC_PLT32, /* type */ 565 0, /* rightshift */ 566 2, /* size (0 = byte, 1 = short, 2 = long) */ 567 32, /* bitsize */ 568 false, /* pc_relative */ 569 0, /* bitpos */ 570 complain_overflow_bitfield, /* complain_on_overflow */ 571 bfd_elf_generic_reloc, /* special_function */ 572 "R_PPC_PLT32", /* name */ 573 false, /* partial_inplace */ 574 0, /* src_mask */ 575 0, /* dst_mask */ 576 false), /* pcrel_offset */ 577 578 /* 32-bit PC relative relocation to the symbol's procedure linkage table. 579 FIXME: not supported. */ 580 HOWTO (R_PPC_PLTREL32, /* type */ 581 0, /* rightshift */ 582 2, /* size (0 = byte, 1 = short, 2 = long) */ 583 32, /* bitsize */ 584 true, /* pc_relative */ 585 0, /* bitpos */ 586 complain_overflow_bitfield, /* complain_on_overflow */ 587 bfd_elf_generic_reloc, /* special_function */ 588 "R_PPC_PLTREL32", /* name */ 589 false, /* partial_inplace */ 590 0, /* src_mask */ 591 0, /* dst_mask */ 592 true), /* pcrel_offset */ 593 594 /* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for 595 the symbol. */ 596 HOWTO (R_PPC_PLT16_LO, /* type */ 597 0, /* rightshift */ 598 1, /* size (0 = byte, 1 = short, 2 = long) */ 599 16, /* bitsize */ 600 false, /* pc_relative */ 601 0, /* bitpos */ 602 complain_overflow_dont, /* complain_on_overflow */ 603 bfd_elf_generic_reloc, /* special_function */ 604 "R_PPC_PLT16_LO", /* name */ 605 false, /* partial_inplace */ 606 0, /* src_mask */ 607 0xffff, /* dst_mask */ 608 false), /* pcrel_offset */ 609 610 /* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for 611 the symbol. */ 612 HOWTO (R_PPC_PLT16_HI, /* type */ 613 16, /* rightshift */ 614 1, /* size (0 = byte, 1 = short, 2 = long) */ 615 16, /* bitsize */ 616 false, /* pc_relative */ 617 0, /* bitpos */ 618 complain_overflow_bitfield, /* complain_on_overflow */ 619 bfd_elf_generic_reloc, /* special_function */ 620 "R_PPC_PLT16_HI", /* name */ 621 false, /* partial_inplace */ 622 0, /* src_mask */ 623 0xffff, /* dst_mask */ 624 false), /* pcrel_offset */ 625 626 /* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for 627 the symbol. */ 628 HOWTO (R_PPC_PLT16_HA, /* type */ 629 16, /* rightshift */ 630 1, /* size (0 = byte, 1 = short, 2 = long) */ 631 16, /* bitsize */ 632 false, /* pc_relative */ 633 0, /* bitpos */ 634 complain_overflow_bitfield, /* complain_on_overflow */ 635 ppc_elf_addr16_ha_reloc, /* special_function */ 636 "R_PPC_PLT16_HA", /* name */ 637 false, /* partial_inplace */ 638 0, /* src_mask */ 639 0xffff, /* dst_mask */ 640 false), /* pcrel_offset */ 641 642 /* A sign-extended 16 bit value relative to _SDA_BASE_, for use with 643 small data items. */ 644 HOWTO (R_PPC_SDAREL16, /* type */ 645 0, /* rightshift */ 646 1, /* size (0 = byte, 1 = short, 2 = long) */ 647 16, /* bitsize */ 648 false, /* pc_relative */ 649 0, /* bitpos */ 650 complain_overflow_signed, /* complain_on_overflow */ 651 bfd_elf_generic_reloc, /* special_function */ 652 "R_PPC_SDAREL16", /* name */ 653 false, /* partial_inplace */ 654 0, /* src_mask */ 655 0xffff, /* dst_mask */ 656 false), /* pcrel_offset */ 657 658 /* 32-bit section relative relocation. */ 659 HOWTO (R_PPC_SECTOFF, /* type */ 660 0, /* rightshift */ 661 2, /* size (0 = byte, 1 = short, 2 = long) */ 662 32, /* bitsize */ 663 true, /* pc_relative */ 664 0, /* bitpos */ 665 complain_overflow_bitfield, /* complain_on_overflow */ 666 bfd_elf_generic_reloc, /* special_function */ 667 "R_PPC_SECTOFF", /* name */ 668 false, /* partial_inplace */ 669 0, /* src_mask */ 670 0, /* dst_mask */ 671 true), /* pcrel_offset */ 672 673 /* 16-bit lower half section relative relocation. */ 674 HOWTO (R_PPC_SECTOFF_LO, /* type */ 675 0, /* rightshift */ 676 1, /* size (0 = byte, 1 = short, 2 = long) */ 677 16, /* bitsize */ 678 false, /* pc_relative */ 679 0, /* bitpos */ 680 complain_overflow_dont, /* complain_on_overflow */ 681 bfd_elf_generic_reloc, /* special_function */ 682 "R_PPC_SECTOFF_LO", /* name */ 683 false, /* partial_inplace */ 684 0, /* src_mask */ 685 0xffff, /* dst_mask */ 686 false), /* pcrel_offset */ 687 688 /* 16-bit upper half section relative relocation. */ 689 HOWTO (R_PPC_SECTOFF_HI, /* type */ 690 16, /* rightshift */ 691 1, /* size (0 = byte, 1 = short, 2 = long) */ 692 16, /* bitsize */ 693 false, /* pc_relative */ 694 0, /* bitpos */ 695 complain_overflow_bitfield, /* complain_on_overflow */ 696 bfd_elf_generic_reloc, /* special_function */ 697 "R_PPC_SECTOFF_HI", /* name */ 698 false, /* partial_inplace */ 699 0, /* src_mask */ 700 0xffff, /* dst_mask */ 701 false), /* pcrel_offset */ 702 703 /* 16-bit upper half adjusted section relative relocation. */ 704 HOWTO (R_PPC_SECTOFF_HA, /* type */ 705 16, /* rightshift */ 706 1, /* size (0 = byte, 1 = short, 2 = long) */ 707 16, /* bitsize */ 708 false, /* pc_relative */ 709 0, /* bitpos */ 710 complain_overflow_bitfield, /* complain_on_overflow */ 711 ppc_elf_addr16_ha_reloc, /* special_function */ 712 "R_PPC_SECTOFF_HA", /* name */ 713 false, /* partial_inplace */ 714 0, /* src_mask */ 715 0xffff, /* dst_mask */ 716 false), /* pcrel_offset */ 717 718 /* The remaining relocs are from the Embedded ELF ABI, and are not 719 in the SVR4 ELF ABI. */ 720 721 /* 32 bit value resulting from the addend minus the symbol */ 722 HOWTO (R_PPC_EMB_NADDR32, /* type */ 723 0, /* rightshift */ 724 2, /* size (0 = byte, 1 = short, 2 = long) */ 725 32, /* bitsize */ 726 false, /* pc_relative */ 727 0, /* bitpos */ 728 complain_overflow_bitfield, /* complain_on_overflow */ 729 bfd_elf_generic_reloc, /* special_function */ 730 "R_PPC_EMB_NADDR32", /* name */ 731 false, /* partial_inplace */ 732 0, /* src_mask */ 733 0xffffffff, /* dst_mask */ 734 false), /* pcrel_offset */ 735 736 /* 16 bit value resulting from the addend minus the symbol */ 737 HOWTO (R_PPC_EMB_NADDR16, /* type */ 738 0, /* rightshift */ 739 1, /* size (0 = byte, 1 = short, 2 = long) */ 740 16, /* bitsize */ 741 false, /* pc_relative */ 742 0, /* bitpos */ 743 complain_overflow_bitfield, /* complain_on_overflow */ 744 bfd_elf_generic_reloc, /* special_function */ 745 "R_PPC_EMB_NADDR16", /* name */ 746 false, /* partial_inplace */ 747 0, /* src_mask */ 748 0xffff, /* dst_mask */ 749 false), /* pcrel_offset */ 750 751 /* 16 bit value resulting from the addend minus the symbol */ 752 HOWTO (R_PPC_EMB_NADDR16_LO, /* type */ 753 0, /* rightshift */ 754 1, /* size (0 = byte, 1 = short, 2 = long) */ 755 16, /* bitsize */ 756 false, /* pc_relative */ 757 0, /* bitpos */ 758 complain_overflow_dont,/* complain_on_overflow */ 759 bfd_elf_generic_reloc, /* special_function */ 760 "R_PPC_EMB_ADDR16_LO", /* name */ 761 false, /* partial_inplace */ 762 0, /* src_mask */ 763 0xffff, /* dst_mask */ 764 false), /* pcrel_offset */ 765 766 /* The high order 16 bits of the addend minus the symbol */ 767 HOWTO (R_PPC_EMB_NADDR16_HI, /* type */ 768 16, /* rightshift */ 769 1, /* size (0 = byte, 1 = short, 2 = long) */ 770 16, /* bitsize */ 771 false, /* pc_relative */ 772 0, /* bitpos */ 773 complain_overflow_dont, /* complain_on_overflow */ 774 bfd_elf_generic_reloc, /* special_function */ 775 "R_PPC_EMB_NADDR16_HI", /* name */ 776 false, /* partial_inplace */ 777 0, /* src_mask */ 778 0xffff, /* dst_mask */ 779 false), /* pcrel_offset */ 780 781 /* The high order 16 bits of the result of the addend minus the address, 782 plus 1 if the contents of the low 16 bits, treated as a signed number, 783 is negative. */ 784 HOWTO (R_PPC_EMB_NADDR16_HA, /* type */ 785 16, /* rightshift */ 786 1, /* size (0 = byte, 1 = short, 2 = long) */ 787 16, /* bitsize */ 788 false, /* pc_relative */ 789 0, /* bitpos */ 790 complain_overflow_dont, /* complain_on_overflow */ 791 ppc_elf_addr16_ha_reloc, /* special_function */ 792 "R_PPC_EMB_NADDR16_HA", /* name */ 793 false, /* partial_inplace */ 794 0, /* src_mask */ 795 0xffff, /* dst_mask */ 796 false), /* pcrel_offset */ 797 798 /* 16 bit value resulting from allocating a 4 byte word to hold an 799 address in the .sdata section, and returning the offset from 800 _SDA_BASE_ for that relocation */ 801 HOWTO (R_PPC_EMB_SDAI16, /* type */ 802 0, /* rightshift */ 803 1, /* size (0 = byte, 1 = short, 2 = long) */ 804 16, /* bitsize */ 805 false, /* pc_relative */ 806 0, /* bitpos */ 807 complain_overflow_bitfield, /* complain_on_overflow */ 808 bfd_elf_generic_reloc, /* special_function */ 809 "R_PPC_EMB_SDAI16", /* name */ 810 false, /* partial_inplace */ 811 0, /* src_mask */ 812 0xffff, /* dst_mask */ 813 false), /* pcrel_offset */ 814 815 /* 16 bit value resulting from allocating a 4 byte word to hold an 816 address in the .sdata2 section, and returning the offset from 817 _SDA2_BASE_ for that relocation */ 818 HOWTO (R_PPC_EMB_SDA2I16, /* type */ 819 0, /* rightshift */ 820 1, /* size (0 = byte, 1 = short, 2 = long) */ 821 16, /* bitsize */ 822 false, /* pc_relative */ 823 0, /* bitpos */ 824 complain_overflow_bitfield, /* complain_on_overflow */ 825 bfd_elf_generic_reloc, /* special_function */ 826 "R_PPC_EMB_SDA2I16", /* name */ 827 false, /* partial_inplace */ 828 0, /* src_mask */ 829 0xffff, /* dst_mask */ 830 false), /* pcrel_offset */ 831 832 /* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with 833 small data items. */ 834 HOWTO (R_PPC_EMB_SDA2REL, /* type */ 835 0, /* rightshift */ 836 1, /* size (0 = byte, 1 = short, 2 = long) */ 837 16, /* bitsize */ 838 false, /* pc_relative */ 839 0, /* bitpos */ 840 complain_overflow_signed, /* complain_on_overflow */ 841 bfd_elf_generic_reloc, /* special_function */ 842 "R_PPC_EMB_SDA2REL", /* name */ 843 false, /* partial_inplace */ 844 0, /* src_mask */ 845 0xffff, /* dst_mask */ 846 false), /* pcrel_offset */ 847 848 /* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit 849 signed offset from the appropriate base, and filling in the register 850 field with the appropriate register (0, 2, or 13). */ 851 HOWTO (R_PPC_EMB_SDA21, /* type */ 852 0, /* rightshift */ 853 2, /* size (0 = byte, 1 = short, 2 = long) */ 854 16, /* bitsize */ 855 false, /* pc_relative */ 856 0, /* bitpos */ 857 complain_overflow_signed, /* complain_on_overflow */ 858 bfd_elf_generic_reloc, /* special_function */ 859 "R_PPC_EMB_SDA21", /* name */ 860 false, /* partial_inplace */ 861 0, /* src_mask */ 862 0xffff, /* dst_mask */ 863 false), /* pcrel_offset */ 864 865 /* Relocation not handled: R_PPC_EMB_MRKREF */ 866 /* Relocation not handled: R_PPC_EMB_RELSEC16 */ 867 /* Relocation not handled: R_PPC_EMB_RELST_LO */ 868 /* Relocation not handled: R_PPC_EMB_RELST_HI */ 869 /* Relocation not handled: R_PPC_EMB_RELST_HA */ 870 /* Relocation not handled: R_PPC_EMB_BIT_FLD */ 871 872 /* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling 873 in the 16 bit signed offset from the appropriate base, and filling in the 874 register field with the appropriate register (0, 2, or 13). */ 875 HOWTO (R_PPC_EMB_RELSDA, /* type */ 876 0, /* rightshift */ 877 1, /* size (0 = byte, 1 = short, 2 = long) */ 878 16, /* bitsize */ 879 true, /* pc_relative */ 880 0, /* bitpos */ 881 complain_overflow_signed, /* complain_on_overflow */ 882 bfd_elf_generic_reloc, /* special_function */ 883 "R_PPC_EMB_RELSDA", /* name */ 884 false, /* partial_inplace */ 885 0, /* src_mask */ 886 0xffff, /* dst_mask */ 887 false), /* pcrel_offset */ 888 889 /* GNU extension to record C++ vtable hierarchy */ 890 HOWTO (R_PPC_GNU_VTINHERIT, /* type */ 891 0, /* rightshift */ 892 0, /* size (0 = byte, 1 = short, 2 = long) */ 893 0, /* bitsize */ 894 false, /* pc_relative */ 895 0, /* bitpos */ 896 complain_overflow_dont, /* complain_on_overflow */ 897 NULL, /* special_function */ 898 "R_PPC_GNU_VTINHERIT", /* name */ 899 false, /* partial_inplace */ 900 0, /* src_mask */ 901 0, /* dst_mask */ 902 false), /* pcrel_offset */ 903 904 /* GNU extension to record C++ vtable member usage */ 905 HOWTO (R_PPC_GNU_VTENTRY, /* type */ 906 0, /* rightshift */ 907 0, /* size (0 = byte, 1 = short, 2 = long) */ 908 0, /* bitsize */ 909 false, /* pc_relative */ 910 0, /* bitpos */ 911 complain_overflow_dont, /* complain_on_overflow */ 912 NULL, /* special_function */ 913 "R_PPC_GNU_VTENTRY", /* name */ 914 false, /* partial_inplace */ 915 0, /* src_mask */ 916 0, /* dst_mask */ 917 false), /* pcrel_offset */ 918 919 /* Phony reloc to handle AIX style TOC entries */ 920 HOWTO (R_PPC_TOC16, /* type */ 921 0, /* rightshift */ 922 1, /* size (0 = byte, 1 = short, 2 = long) */ 923 16, /* bitsize */ 924 false, /* pc_relative */ 925 0, /* bitpos */ 926 complain_overflow_signed, /* complain_on_overflow */ 927 bfd_elf_generic_reloc, /* special_function */ 928 "R_PPC_TOC16", /* name */ 929 false, /* partial_inplace */ 930 0, /* src_mask */ 931 0xffff, /* dst_mask */ 932 false), /* pcrel_offset */ 933}; 934 935 936/* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */ 937 938static void 939ppc_elf_howto_init () 940{ 941 unsigned int i, type; 942 943 for (i = 0; i < sizeof (ppc_elf_howto_raw) / sizeof (ppc_elf_howto_raw[0]); i++) 944 { 945 type = ppc_elf_howto_raw[i].type; 946 BFD_ASSERT (type < sizeof(ppc_elf_howto_table) / sizeof(ppc_elf_howto_table[0])); 947 ppc_elf_howto_table[type] = &ppc_elf_howto_raw[i]; 948 } 949} 950 951 952/* This function handles relaxing for the PPC with option --mpc860c0[=<n>]. 953 954 The MPC860, revision C0 or earlier contains a bug in the die. 955 If all of the following conditions are true, the next instruction 956 to be executed *may* be treated as a no-op. 957 1/ A forward branch is executed. 958 2/ The branch is predicted as not taken. 959 3/ The branch is taken. 960 4/ The branch is located in the last 5 words of a page. 961 (The EOP limit is 5 by default but may be specified as any value from 1-10.) 962 963 Our software solution is to detect these problematic branches in a 964 linker pass and modify them as follows: 965 1/ Unconditional branches - Since these are always predicted taken, 966 there is no problem and no action is required. 967 2/ Conditional backward branches - No problem, no action required. 968 3/ Conditional forward branches - Ensure that the "inverse prediction 969 bit" is set (ensure it is predicted taken). 970 4/ Conditional register branches - Ensure that the "y bit" is set 971 (ensure it is predicted taken). 972*/ 973 974/* Sort sections by address. */ 975 976static int 977ppc_elf_sort_rela (arg1, arg2) 978 const void *arg1; 979 const void *arg2; 980{ 981 const Elf_Internal_Rela **rela1 = (const Elf_Internal_Rela**) arg1; 982 const Elf_Internal_Rela **rela2 = (const Elf_Internal_Rela**) arg2; 983 984 /* Sort by offset. */ 985 return ((*rela1)->r_offset - (*rela2)->r_offset); 986} 987 988static boolean 989ppc_elf_relax_section (abfd, isec, link_info, again) 990 bfd *abfd; 991 asection *isec; 992 struct bfd_link_info *link_info; 993 boolean *again; 994{ 995#define PAGESIZE 0x1000 996 997 bfd_byte *contents = NULL; 998 bfd_byte *free_contents = NULL; 999 Elf_Internal_Rela *internal_relocs = NULL; 1000 Elf_Internal_Rela *free_relocs = NULL; 1001 Elf_Internal_Rela **rela_comb = NULL; 1002 int comb_curr, comb_count; 1003 1004 /* We never have to do this more than once per input section. */ 1005 *again = false; 1006 1007 /* If needed, initialize this section's cooked size. */ 1008 if (isec->_cooked_size == 0) 1009 isec->_cooked_size = isec->_raw_size; 1010 1011 /* We're only interested in text sections which overlap the 1012 troublesome area at the end of a page. */ 1013 if (link_info->mpc860c0 && (isec->flags & SEC_CODE) && isec->_cooked_size) 1014 { 1015 bfd_vma dot, end_page, end_section; 1016 boolean section_modified; 1017 1018 /* Get the section contents. */ 1019 /* Get cached copy if it exists. */ 1020 if (elf_section_data (isec)->this_hdr.contents != NULL) 1021 contents = elf_section_data (isec)->this_hdr.contents; 1022 else 1023 { 1024 /* Go get them off disk. */ 1025 contents = (bfd_byte *) bfd_malloc (isec->_raw_size); 1026 if (contents == NULL) 1027 goto error_return; 1028 free_contents = contents; 1029 1030 if (! bfd_get_section_contents (abfd, isec, contents, 1031 (file_ptr) 0, isec->_raw_size)) 1032 goto error_return; 1033 } 1034 1035 comb_curr = 0; 1036 comb_count = 0; 1037 if (isec->reloc_count) 1038 { 1039 unsigned n; 1040 1041 /* Get a copy of the native relocations. */ 1042 internal_relocs = _bfd_elf32_link_read_relocs ( 1043 abfd, isec, (PTR) NULL, (Elf_Internal_Rela *) NULL, 1044 link_info->keep_memory); 1045 if (internal_relocs == NULL) 1046 goto error_return; 1047 if (! link_info->keep_memory) 1048 free_relocs = internal_relocs; 1049 1050 /* Setup a faster access method for the reloc info we need. */ 1051 rela_comb = (Elf_Internal_Rela**) 1052 bfd_malloc (isec->reloc_count*sizeof(Elf_Internal_Rela*)); 1053 if (rela_comb == NULL) 1054 goto error_return; 1055 for (n=0; n<isec->reloc_count; ++n) 1056 { 1057 long r_type; 1058 1059 r_type = ELF32_R_TYPE (internal_relocs[n].r_info); 1060 if (r_type < 0 || r_type >= (int)R_PPC_max) 1061 goto error_return; 1062 1063 /* Prologue constants are sometimes present in the ".text" 1064 sections and they can be identified by their associated relocation. 1065 We don't want to process those words and some others which 1066 can also be identified by their relocations. However, not all 1067 conditional branches will have a relocation so we will 1068 only ignore words that 1) have a reloc, and 2) the reloc 1069 is not applicable to a conditional branch. 1070 The array rela_comb is built here for use in the EOP scan loop. */ 1071 switch (r_type) 1072 { 1073 case R_PPC_ADDR14_BRNTAKEN: /* absolute, predicted not taken */ 1074 case R_PPC_REL14: /* relative cond. br. */ 1075 case R_PPC_REL14_BRNTAKEN: /* rel. cond. br., predicted not taken */ 1076 /* We should check the instruction. */ 1077 break; 1078 default: 1079 /* The word is not a conditional branch - ignore it. */ 1080 rela_comb[comb_count++] = &internal_relocs[n]; 1081 break; 1082 } 1083 } 1084 if (comb_count > 1) 1085 qsort (rela_comb, (size_t) comb_count, sizeof (int), ppc_elf_sort_rela); 1086 } 1087 1088 /* Enumerate each EOP region that overlaps this section. */ 1089 end_section = isec->vma + isec->_cooked_size; 1090 dot = end_page = (isec->vma | (PAGESIZE - 1)) + 1; 1091 dot -= link_info->mpc860c0; 1092 section_modified = false; 1093 if (dot < isec->vma) /* Increment the start position if this section */ 1094 dot = isec->vma; /* begins in the middle of its first EOP region. */ 1095 for (; 1096 dot < end_section; 1097 dot += PAGESIZE, end_page += PAGESIZE) 1098 { 1099 1100 /* Check each word in this EOP region. */ 1101 for (; dot < end_page; dot += 4) 1102 { 1103 bfd_vma isec_offset; 1104 unsigned long insn; 1105 boolean skip, modified; 1106 1107 /* Don't process this word if there is a relocation for it and 1108 the relocation indicates the word is not a conditional branch. */ 1109 skip = false; 1110 isec_offset = dot - isec->vma; 1111 for (; comb_curr<comb_count; ++comb_curr) 1112 { 1113 bfd_vma r_offset; 1114 1115 r_offset = rela_comb[comb_curr]->r_offset; 1116 if (r_offset >= isec_offset) 1117 { 1118 if (r_offset == isec_offset) skip = true; 1119 break; 1120 } 1121 } 1122 if (skip) continue; 1123 1124 /* Check the current word for a problematic conditional branch. */ 1125#define BO0(insn) ((insn) & 0x02000000) 1126#define BO2(insn) ((insn) & 0x00800000) 1127#define BO4(insn) ((insn) & 0x00200000) 1128 insn = (unsigned long) bfd_get_32 (abfd, contents + isec_offset); 1129 modified = false; 1130 if ((insn & 0xFc000000) == 0x40000000) 1131 { 1132 /* Instruction is BCx */ 1133 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn)) 1134 { 1135 bfd_vma target; 1136 /* This branch is predicted as "normal". 1137 If this is a forward branch, it is problematic. */ 1138 1139 target = insn & 0x0000Fffc; /*extract*/ 1140 target = (target ^ 0x8000) - 0x8000; /*sign extend*/ 1141 if ((insn & 0x00000002) == 0) 1142 target += dot; /*convert to abs*/ 1143 if (target > dot) 1144 { 1145 insn |= 0x00200000; /* set the prediction bit */ 1146 modified = true; 1147 } 1148 } 1149 } 1150 else if ((insn & 0xFc00Fffe) == 0x4c000420) 1151 { 1152 /* Instruction is BCCTRx */ 1153 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn)) 1154 { 1155 /* This branch is predicted as not-taken. 1156 If this is a forward branch, it is problematic. 1157 Since we can't tell statically if it will branch forward, 1158 always set the prediction bit. */ 1159 insn |= 0x00200000; /* set the prediction bit */ 1160 modified = true; 1161 } 1162 } 1163 else if ((insn & 0xFc00Fffe) == 0x4c000020) 1164 { 1165 /* Instruction is BCLRx */ 1166 if ((!BO0(insn) || !BO2(insn)) && !BO4(insn)) 1167 { 1168 /* This branch is predicted as not-taken. 1169 If this is a forward branch, it is problematic. 1170 Since we can't tell statically if it will branch forward, 1171 always set the prediction bit. */ 1172 insn |= 0x00200000; /* set the prediction bit */ 1173 modified = true; 1174 } 1175 } 1176#undef BO0 1177#undef BO2 1178#undef BO4 1179 if (modified) 1180 { 1181 bfd_put_32 (abfd, insn, contents + isec_offset); 1182 section_modified = true; 1183 } 1184 } 1185 } 1186 if (section_modified) 1187 { 1188 elf_section_data (isec)->this_hdr.contents = contents; 1189 free_contents = NULL; 1190 } 1191 } 1192 1193 if (rela_comb != NULL) 1194 { 1195 free (rela_comb); 1196 rela_comb = NULL; 1197 } 1198 1199 if (free_relocs != NULL) 1200 { 1201 free (free_relocs); 1202 free_relocs = NULL; 1203 } 1204 1205 if (free_contents != NULL) 1206 { 1207 if (! link_info->keep_memory) 1208 free (free_contents); 1209 else 1210 { 1211 /* Cache the section contents for elf_link_input_bfd. */ 1212 elf_section_data (isec)->this_hdr.contents = contents; 1213 } 1214 free_contents = NULL; 1215 } 1216 1217 return true; 1218 1219error_return: 1220 if (rela_comb != NULL) 1221 free (rela_comb); 1222 if (free_relocs != NULL) 1223 free (free_relocs); 1224 if (free_contents != NULL) 1225 free (free_contents); 1226 return false; 1227} 1228 1229 1230static reloc_howto_type * 1231ppc_elf_reloc_type_lookup (abfd, code) 1232 bfd *abfd ATTRIBUTE_UNUSED; 1233 bfd_reloc_code_real_type code; 1234{ 1235 enum elf_ppc_reloc_type ppc_reloc = R_PPC_NONE; 1236 1237 if (!ppc_elf_howto_table[R_PPC_ADDR32]) 1238 /* Initialize howto table if needed */ 1239 ppc_elf_howto_init (); 1240 1241 switch ((int)code) 1242 { 1243 default: 1244 return (reloc_howto_type *)NULL; 1245 1246 case BFD_RELOC_NONE: ppc_reloc = R_PPC_NONE; break; 1247 case BFD_RELOC_32: ppc_reloc = R_PPC_ADDR32; break; 1248 case BFD_RELOC_PPC_BA26: ppc_reloc = R_PPC_ADDR24; break; 1249 case BFD_RELOC_16: ppc_reloc = R_PPC_ADDR16; break; 1250 case BFD_RELOC_LO16: ppc_reloc = R_PPC_ADDR16_LO; break; 1251 case BFD_RELOC_HI16: ppc_reloc = R_PPC_ADDR16_HI; break; 1252 case BFD_RELOC_HI16_S: ppc_reloc = R_PPC_ADDR16_HA; break; 1253 case BFD_RELOC_PPC_BA16: ppc_reloc = R_PPC_ADDR14; break; 1254 case BFD_RELOC_PPC_BA16_BRTAKEN: ppc_reloc = R_PPC_ADDR14_BRTAKEN; break; 1255 case BFD_RELOC_PPC_BA16_BRNTAKEN: ppc_reloc = R_PPC_ADDR14_BRNTAKEN; break; 1256 case BFD_RELOC_PPC_B26: ppc_reloc = R_PPC_REL24; break; 1257 case BFD_RELOC_PPC_B16: ppc_reloc = R_PPC_REL14; break; 1258 case BFD_RELOC_PPC_B16_BRTAKEN: ppc_reloc = R_PPC_REL14_BRTAKEN; break; 1259 case BFD_RELOC_PPC_B16_BRNTAKEN: ppc_reloc = R_PPC_REL14_BRNTAKEN; break; 1260 case BFD_RELOC_16_GOTOFF: ppc_reloc = R_PPC_GOT16; break; 1261 case BFD_RELOC_LO16_GOTOFF: ppc_reloc = R_PPC_GOT16_LO; break; 1262 case BFD_RELOC_HI16_GOTOFF: ppc_reloc = R_PPC_GOT16_HI; break; 1263 case BFD_RELOC_HI16_S_GOTOFF: ppc_reloc = R_PPC_GOT16_HA; break; 1264 case BFD_RELOC_24_PLT_PCREL: ppc_reloc = R_PPC_PLTREL24; break; 1265 case BFD_RELOC_PPC_COPY: ppc_reloc = R_PPC_COPY; break; 1266 case BFD_RELOC_PPC_GLOB_DAT: ppc_reloc = R_PPC_GLOB_DAT; break; 1267 case BFD_RELOC_PPC_LOCAL24PC: ppc_reloc = R_PPC_LOCAL24PC; break; 1268 case BFD_RELOC_32_PCREL: ppc_reloc = R_PPC_REL32; break; 1269 case BFD_RELOC_32_PLTOFF: ppc_reloc = R_PPC_PLT32; break; 1270 case BFD_RELOC_32_PLT_PCREL: ppc_reloc = R_PPC_PLTREL32; break; 1271 case BFD_RELOC_LO16_PLTOFF: ppc_reloc = R_PPC_PLT16_LO; break; 1272 case BFD_RELOC_HI16_PLTOFF: ppc_reloc = R_PPC_PLT16_HI; break; 1273 case BFD_RELOC_HI16_S_PLTOFF: ppc_reloc = R_PPC_PLT16_HA; break; 1274 case BFD_RELOC_GPREL16: ppc_reloc = R_PPC_SDAREL16; break; 1275 case BFD_RELOC_32_BASEREL: ppc_reloc = R_PPC_SECTOFF; break; 1276 case BFD_RELOC_LO16_BASEREL: ppc_reloc = R_PPC_SECTOFF_LO; break; 1277 case BFD_RELOC_HI16_BASEREL: ppc_reloc = R_PPC_SECTOFF_HI; break; 1278 case BFD_RELOC_HI16_S_BASEREL: ppc_reloc = R_PPC_SECTOFF_HA; break; 1279 case BFD_RELOC_CTOR: ppc_reloc = R_PPC_ADDR32; break; 1280 case BFD_RELOC_PPC_TOC16: ppc_reloc = R_PPC_TOC16; break; 1281 case BFD_RELOC_PPC_EMB_NADDR32: ppc_reloc = R_PPC_EMB_NADDR32; break; 1282 case BFD_RELOC_PPC_EMB_NADDR16: ppc_reloc = R_PPC_EMB_NADDR16; break; 1283 case BFD_RELOC_PPC_EMB_NADDR16_LO: ppc_reloc = R_PPC_EMB_NADDR16_LO; break; 1284 case BFD_RELOC_PPC_EMB_NADDR16_HI: ppc_reloc = R_PPC_EMB_NADDR16_HI; break; 1285 case BFD_RELOC_PPC_EMB_NADDR16_HA: ppc_reloc = R_PPC_EMB_NADDR16_HA; break; 1286 case BFD_RELOC_PPC_EMB_SDAI16: ppc_reloc = R_PPC_EMB_SDAI16; break; 1287 case BFD_RELOC_PPC_EMB_SDA2I16: ppc_reloc = R_PPC_EMB_SDA2I16; break; 1288 case BFD_RELOC_PPC_EMB_SDA2REL: ppc_reloc = R_PPC_EMB_SDA2REL; break; 1289 case BFD_RELOC_PPC_EMB_SDA21: ppc_reloc = R_PPC_EMB_SDA21; break; 1290 case BFD_RELOC_PPC_EMB_MRKREF: ppc_reloc = R_PPC_EMB_MRKREF; break; 1291 case BFD_RELOC_PPC_EMB_RELSEC16: ppc_reloc = R_PPC_EMB_RELSEC16; break; 1292 case BFD_RELOC_PPC_EMB_RELST_LO: ppc_reloc = R_PPC_EMB_RELST_LO; break; 1293 case BFD_RELOC_PPC_EMB_RELST_HI: ppc_reloc = R_PPC_EMB_RELST_HI; break; 1294 case BFD_RELOC_PPC_EMB_RELST_HA: ppc_reloc = R_PPC_EMB_RELST_HA; break; 1295 case BFD_RELOC_PPC_EMB_BIT_FLD: ppc_reloc = R_PPC_EMB_BIT_FLD; break; 1296 case BFD_RELOC_PPC_EMB_RELSDA: ppc_reloc = R_PPC_EMB_RELSDA; break; 1297 case BFD_RELOC_VTABLE_INHERIT: ppc_reloc = R_PPC_GNU_VTINHERIT; break; 1298 case BFD_RELOC_VTABLE_ENTRY: ppc_reloc = R_PPC_GNU_VTENTRY; break; 1299 } 1300 1301 return ppc_elf_howto_table[ (int)ppc_reloc ]; 1302}; 1303 1304/* Set the howto pointer for a PowerPC ELF reloc. */ 1305 1306static void 1307ppc_elf_info_to_howto (abfd, cache_ptr, dst) 1308 bfd *abfd ATTRIBUTE_UNUSED; 1309 arelent *cache_ptr; 1310 Elf32_Internal_Rela *dst; 1311{ 1312 if (!ppc_elf_howto_table[ R_PPC_ADDR32 ]) /* Initialize howto table if needed */ 1313 ppc_elf_howto_init (); 1314 1315 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_PPC_max); 1316 cache_ptr->howto = ppc_elf_howto_table[ELF32_R_TYPE (dst->r_info)]; 1317} 1318 1319/* Handle the R_PPC_ADDR16_HA reloc. */ 1320 1321static bfd_reloc_status_type 1322ppc_elf_addr16_ha_reloc (abfd, reloc_entry, symbol, data, input_section, 1323 output_bfd, error_message) 1324 bfd *abfd ATTRIBUTE_UNUSED; 1325 arelent *reloc_entry; 1326 asymbol *symbol; 1327 PTR data ATTRIBUTE_UNUSED; 1328 asection *input_section; 1329 bfd *output_bfd; 1330 char **error_message ATTRIBUTE_UNUSED; 1331{ 1332 bfd_vma relocation; 1333 1334 if (output_bfd != NULL) 1335 { 1336 reloc_entry->address += input_section->output_offset; 1337 return bfd_reloc_ok; 1338 } 1339 1340 if (reloc_entry->address > input_section->_cooked_size) 1341 return bfd_reloc_outofrange; 1342 1343 if (bfd_is_com_section (symbol->section)) 1344 relocation = 0; 1345 else 1346 relocation = symbol->value; 1347 1348 relocation += symbol->section->output_section->vma; 1349 relocation += symbol->section->output_offset; 1350 relocation += reloc_entry->addend; 1351 1352 reloc_entry->addend += (relocation & 0x8000) << 1; 1353 1354 return bfd_reloc_continue; 1355} 1356 1357/* Function to set whether a module needs the -mrelocatable bit set. */ 1358 1359static boolean 1360ppc_elf_set_private_flags (abfd, flags) 1361 bfd *abfd; 1362 flagword flags; 1363{ 1364 BFD_ASSERT (!elf_flags_init (abfd) 1365 || elf_elfheader (abfd)->e_flags == flags); 1366 1367 elf_elfheader (abfd)->e_flags = flags; 1368 elf_flags_init (abfd) = true; 1369 return true; 1370} 1371 1372/* Copy backend specific data from one object module to another */ 1373static boolean 1374ppc_elf_copy_private_bfd_data (ibfd, obfd) 1375 bfd *ibfd; 1376 bfd *obfd; 1377{ 1378 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1379 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1380 return true; 1381 1382 BFD_ASSERT (!elf_flags_init (obfd) 1383 || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags); 1384 1385 elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; 1386 elf_flags_init (obfd) = true; 1387 return true; 1388} 1389 1390/* Merge backend specific data from an object file to the output 1391 object file when linking */ 1392static boolean 1393ppc_elf_merge_private_bfd_data (ibfd, obfd) 1394 bfd *ibfd; 1395 bfd *obfd; 1396{ 1397 flagword old_flags; 1398 flagword new_flags; 1399 boolean error; 1400 1401 /* Check if we have the same endianess */ 1402 if (ibfd->xvec->byteorder != obfd->xvec->byteorder 1403 && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN) 1404 { 1405 const char *msg; 1406 1407 if (bfd_big_endian (ibfd)) 1408 msg = _("%s: compiled for a big endian system and target is little endian"); 1409 else 1410 msg = _("%s: compiled for a little endian system and target is big endian"); 1411 1412 (*_bfd_error_handler) (msg, bfd_get_filename (ibfd)); 1413 1414 bfd_set_error (bfd_error_wrong_format); 1415 return false; 1416 } 1417 1418 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 1419 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 1420 return true; 1421 1422 new_flags = elf_elfheader (ibfd)->e_flags; 1423 old_flags = elf_elfheader (obfd)->e_flags; 1424 if (!elf_flags_init (obfd)) /* First call, no flags set */ 1425 { 1426 elf_flags_init (obfd) = true; 1427 elf_elfheader (obfd)->e_flags = new_flags; 1428 } 1429 1430 else if (new_flags == old_flags) /* Compatible flags are ok */ 1431 ; 1432 1433 else /* Incompatible flags */ 1434 { 1435 /* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib to be linked 1436 with either. */ 1437 error = false; 1438 if ((new_flags & EF_PPC_RELOCATABLE) != 0 1439 && (old_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0) 1440 { 1441 error = true; 1442 (*_bfd_error_handler) 1443 (_("%s: compiled with -mrelocatable and linked with modules compiled normally"), 1444 bfd_get_filename (ibfd)); 1445 } 1446 else if ((new_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0 1447 && (old_flags & EF_PPC_RELOCATABLE) != 0) 1448 { 1449 error = true; 1450 (*_bfd_error_handler) 1451 (_("%s: compiled normally and linked with modules compiled with -mrelocatable"), 1452 bfd_get_filename (ibfd)); 1453 } 1454 1455 /* The output is -mrelocatable-lib iff both the input files are. */ 1456 if (! (new_flags & EF_PPC_RELOCATABLE_LIB)) 1457 elf_elfheader (obfd)->e_flags &= ~EF_PPC_RELOCATABLE_LIB; 1458 1459 /* The output is -mrelocatable iff it can't be -mrelocatable-lib, 1460 but each input file is either -mrelocatable or -mrelocatable-lib. */ 1461 if (! (elf_elfheader (obfd)->e_flags & EF_PPC_RELOCATABLE_LIB) 1462 && (new_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE)) 1463 && (old_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE))) 1464 elf_elfheader (obfd)->e_flags |= EF_PPC_RELOCATABLE; 1465 1466 /* Do not warn about eabi vs. V.4 mismatch, just or in the bit if any module uses it */ 1467 elf_elfheader (obfd)->e_flags |= (new_flags & EF_PPC_EMB); 1468 1469 new_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB); 1470 old_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB); 1471 1472 /* Warn about any other mismatches */ 1473 if (new_flags != old_flags) 1474 { 1475 error = true; 1476 (*_bfd_error_handler) 1477 (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"), 1478 bfd_get_filename (ibfd), (long)new_flags, (long)old_flags); 1479 } 1480 1481 if (error) 1482 { 1483 bfd_set_error (bfd_error_bad_value); 1484 return false; 1485 } 1486 } 1487 1488 return true; 1489} 1490 1491 1492/* Handle a PowerPC specific section when reading an object file. This 1493 is called when elfcode.h finds a section with an unknown type. */ 1494 1495static boolean 1496ppc_elf_section_from_shdr (abfd, hdr, name) 1497 bfd *abfd; 1498 Elf32_Internal_Shdr *hdr; 1499 char *name; 1500{ 1501 asection *newsect; 1502 flagword flags; 1503 1504 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name)) 1505 return false; 1506 1507 newsect = hdr->bfd_section; 1508 flags = bfd_get_section_flags (abfd, newsect); 1509 if (hdr->sh_flags & SHF_EXCLUDE) 1510 flags |= SEC_EXCLUDE; 1511 1512 if (hdr->sh_type == SHT_ORDERED) 1513 flags |= SEC_SORT_ENTRIES; 1514 1515 bfd_set_section_flags (abfd, newsect, flags); 1516 return true; 1517} 1518 1519 1520/* Set up any other section flags and such that may be necessary. */ 1521 1522static boolean 1523ppc_elf_fake_sections (abfd, shdr, asect) 1524 bfd *abfd ATTRIBUTE_UNUSED; 1525 Elf32_Internal_Shdr *shdr; 1526 asection *asect; 1527{ 1528 if ((asect->flags & SEC_EXCLUDE) != 0) 1529 shdr->sh_flags |= SHF_EXCLUDE; 1530 1531 if ((asect->flags & SEC_SORT_ENTRIES) != 0) 1532 shdr->sh_type = SHT_ORDERED; 1533 1534 return true; 1535} 1536 1537 1538/* Create a special linker section */ 1539static elf_linker_section_t * 1540ppc_elf_create_linker_section (abfd, info, which) 1541 bfd *abfd; 1542 struct bfd_link_info *info; 1543 enum elf_linker_section_enum which; 1544{ 1545 bfd *dynobj = elf_hash_table (info)->dynobj; 1546 elf_linker_section_t *lsect; 1547 1548 /* Record the first bfd section that needs the special section */ 1549 if (!dynobj) 1550 dynobj = elf_hash_table (info)->dynobj = abfd; 1551 1552 /* If this is the first time, create the section */ 1553 lsect = elf_linker_section (dynobj, which); 1554 if (!lsect) 1555 { 1556 elf_linker_section_t defaults; 1557 static elf_linker_section_t zero_section; 1558 1559 defaults = zero_section; 1560 defaults.which = which; 1561 defaults.hole_written_p = false; 1562 defaults.alignment = 2; 1563 1564 /* Both of these sections are (technically) created by the user 1565 putting data in them, so they shouldn't be marked 1566 SEC_LINKER_CREATED. 1567 1568 The linker creates them so it has somewhere to attach their 1569 respective symbols. In fact, if they were empty it would 1570 be OK to leave the symbol set to 0 (or any random number), because 1571 the appropriate register should never be used. */ 1572 defaults.flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS 1573 | SEC_IN_MEMORY); 1574 1575 switch (which) 1576 { 1577 default: 1578 (*_bfd_error_handler) (_("%s: Unknown special linker type %d"), 1579 bfd_get_filename (abfd), 1580 (int)which); 1581 1582 bfd_set_error (bfd_error_bad_value); 1583 return (elf_linker_section_t *)0; 1584 1585 case LINKER_SECTION_SDATA: /* .sdata/.sbss section */ 1586 defaults.name = ".sdata"; 1587 defaults.rel_name = ".rela.sdata"; 1588 defaults.bss_name = ".sbss"; 1589 defaults.sym_name = "_SDA_BASE_"; 1590 defaults.sym_offset = 32768; 1591 break; 1592 1593 case LINKER_SECTION_SDATA2: /* .sdata2/.sbss2 section */ 1594 defaults.name = ".sdata2"; 1595 defaults.rel_name = ".rela.sdata2"; 1596 defaults.bss_name = ".sbss2"; 1597 defaults.sym_name = "_SDA2_BASE_"; 1598 defaults.sym_offset = 32768; 1599 defaults.flags |= SEC_READONLY; 1600 break; 1601 } 1602 1603 lsect = _bfd_elf_create_linker_section (abfd, info, which, &defaults); 1604 } 1605 1606 return lsect; 1607} 1608 1609 1610/* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we need to bump up 1611 the number of section headers. */ 1612 1613static int 1614ppc_elf_additional_program_headers (abfd) 1615 bfd *abfd; 1616{ 1617 asection *s; 1618 int ret; 1619 1620 ret = 0; 1621 1622 s = bfd_get_section_by_name (abfd, ".interp"); 1623 if (s != NULL) 1624 ++ret; 1625 1626 s = bfd_get_section_by_name (abfd, ".sbss2"); 1627 if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0) 1628 ++ret; 1629 1630 s = bfd_get_section_by_name (abfd, ".PPC.EMB.sbss0"); 1631 if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0) 1632 ++ret; 1633 1634 return ret; 1635} 1636 1637/* Modify the segment map if needed */ 1638 1639static boolean 1640ppc_elf_modify_segment_map (abfd) 1641 bfd *abfd ATTRIBUTE_UNUSED; 1642{ 1643 return true; 1644} 1645 1646/* We have to create .dynsbss and .rela.sbss here so that they get mapped 1647 to output sections (just like _bfd_elf_create_dynamic_sections has 1648 to create .dynbss and .rela.bss). */ 1649 1650static boolean 1651ppc_elf_create_dynamic_sections (abfd, info) 1652 bfd *abfd; 1653 struct bfd_link_info *info; 1654{ 1655 register asection *s; 1656 flagword flags; 1657 1658 if (!_bfd_elf_create_dynamic_sections(abfd, info)) 1659 return false; 1660 1661 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 1662 | SEC_LINKER_CREATED); 1663 1664 s = bfd_make_section (abfd, ".dynsbss"); 1665 if (s == NULL 1666 || ! bfd_set_section_flags (abfd, s, SEC_ALLOC)) 1667 return false; 1668 1669 if (! info->shared) 1670 { 1671 s = bfd_make_section (abfd, ".rela.sbss"); 1672 if (s == NULL 1673 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) 1674 || ! bfd_set_section_alignment (abfd, s, 2)) 1675 return false; 1676 } 1677 return true; 1678} 1679 1680/* Adjust a symbol defined by a dynamic object and referenced by a 1681 regular object. The current definition is in some section of the 1682 dynamic object, but we're not including those sections. We have to 1683 change the definition to something the rest of the link can 1684 understand. */ 1685 1686static boolean 1687ppc_elf_adjust_dynamic_symbol (info, h) 1688 struct bfd_link_info *info; 1689 struct elf_link_hash_entry *h; 1690{ 1691 bfd *dynobj = elf_hash_table (info)->dynobj; 1692 asection *s; 1693 unsigned int power_of_two; 1694 bfd_vma plt_offset; 1695 1696#ifdef DEBUG 1697 fprintf (stderr, "ppc_elf_adjust_dynamic_symbol called for %s\n", h->root.root.string); 1698#endif 1699 1700 /* Make sure we know what is going on here. */ 1701 BFD_ASSERT (dynobj != NULL 1702 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) 1703 || h->weakdef != NULL 1704 || ((h->elf_link_hash_flags 1705 & ELF_LINK_HASH_DEF_DYNAMIC) != 0 1706 && (h->elf_link_hash_flags 1707 & ELF_LINK_HASH_REF_REGULAR) != 0 1708 && (h->elf_link_hash_flags 1709 & ELF_LINK_HASH_DEF_REGULAR) == 0))); 1710 1711 1712 /* If this is a function, put it in the procedure linkage table. We 1713 will fill in the contents of the procedure linkage table later, 1714 when we know the address of the .got section. */ 1715 if (h->type == STT_FUNC 1716 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) 1717 { 1718 if (! elf_hash_table (info)->dynamic_sections_created 1719 || ((!info->shared || info->symbolic || h->dynindx == -1) 1720 && (h->elf_link_hash_flags 1721 & ELF_LINK_HASH_DEF_REGULAR) != 0) 1722 || (info->shared && h->plt.refcount <= 0)) 1723 { 1724 /* A PLT entry is not required/allowed when: 1725 1726 1. We are not using ld.so; because then the PLT entry 1727 can't be set up, so we can't use one. 1728 1729 2. We know for certain that a symbol is defined in 1730 this object, because this object is the application, 1731 is linked with -Bsymbolic, or because the symbol is local. 1732 1733 3. GC has rendered the entry unused. 1734 Note, however, that in an executable all references to the 1735 symbol go to the PLT, so we can't turn it off in that case. 1736 ??? The correct thing to do here is to reference count 1737 all uses of the symbol, not just those to the GOT or PLT. */ 1738 h->plt.offset = (bfd_vma) -1; 1739 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 1740 return true; 1741 } 1742 1743 /* Make sure this symbol is output as a dynamic symbol. */ 1744 if (h->dynindx == -1) 1745 { 1746 if (! bfd_elf32_link_record_dynamic_symbol (info, h)) 1747 return false; 1748 } 1749 BFD_ASSERT (h->dynindx != -1); 1750 1751 s = bfd_get_section_by_name (dynobj, ".plt"); 1752 BFD_ASSERT (s != NULL); 1753 1754 /* If this is the first .plt entry, make room for the special 1755 first entry. */ 1756 if (s->_raw_size == 0) 1757 s->_raw_size += PLT_INITIAL_ENTRY_SIZE; 1758 1759 /* The PowerPC PLT is actually composed of two parts, the first part 1760 is 2 words (for a load and a jump), and then there is a remaining 1761 word available at the end. */ 1762 plt_offset = (PLT_INITIAL_ENTRY_SIZE 1763 + (PLT_SLOT_SIZE 1764 * ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE) 1765 / PLT_ENTRY_SIZE))); 1766 1767 /* If this symbol is not defined in a regular file, and we are 1768 not generating a shared library, then set the symbol to this 1769 location in the .plt. This is required to make function 1770 pointers compare as equal between the normal executable and 1771 the shared library. */ 1772 if (! info->shared 1773 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 1774 { 1775 h->root.u.def.section = s; 1776 h->root.u.def.value = plt_offset; 1777 } 1778 1779 h->plt.offset = plt_offset; 1780 1781 /* Make room for this entry. After the 8192nd entry, room 1782 for two entries is allocated. */ 1783 if ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE 1784 >= PLT_NUM_SINGLE_ENTRIES) 1785 s->_raw_size += 2 * PLT_ENTRY_SIZE; 1786 else 1787 s->_raw_size += PLT_ENTRY_SIZE; 1788 1789 /* We also need to make an entry in the .rela.plt section. */ 1790 s = bfd_get_section_by_name (dynobj, ".rela.plt"); 1791 BFD_ASSERT (s != NULL); 1792 s->_raw_size += sizeof (Elf32_External_Rela); 1793 1794 return true; 1795 } 1796 1797 /* If this is a weak symbol, and there is a real definition, the 1798 processor independent code will have arranged for us to see the 1799 real definition first, and we can just use the same value. */ 1800 if (h->weakdef != NULL) 1801 { 1802 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined 1803 || h->weakdef->root.type == bfd_link_hash_defweak); 1804 h->root.u.def.section = h->weakdef->root.u.def.section; 1805 h->root.u.def.value = h->weakdef->root.u.def.value; 1806 return true; 1807 } 1808 1809 /* This is a reference to a symbol defined by a dynamic object which 1810 is not a function. */ 1811 1812 /* If we are creating a shared library, we must presume that the 1813 only references to the symbol are via the global offset table. 1814 For such cases we need not do anything here; the relocations will 1815 be handled correctly by relocate_section. */ 1816 if (info->shared) 1817 return true; 1818 1819 /* We must allocate the symbol in our .dynbss section, which will 1820 become part of the .bss section of the executable. There will be 1821 an entry for this symbol in the .dynsym section. The dynamic 1822 object will contain position independent code, so all references 1823 from the dynamic object to this symbol will go through the global 1824 offset table. The dynamic linker will use the .dynsym entry to 1825 determine the address it must put in the global offset table, so 1826 both the dynamic object and the regular object will refer to the 1827 same memory location for the variable. 1828 1829 Of course, if the symbol is sufficiently small, we must instead 1830 allocate it in .sbss. FIXME: It would be better to do this if and 1831 only if there were actually SDAREL relocs for that symbol. */ 1832 1833 if (h->size <= elf_gp_size (dynobj)) 1834 s = bfd_get_section_by_name (dynobj, ".dynsbss"); 1835 else 1836 s = bfd_get_section_by_name (dynobj, ".dynbss"); 1837 BFD_ASSERT (s != NULL); 1838 1839 /* We must generate a R_PPC_COPY reloc to tell the dynamic linker to 1840 copy the initial value out of the dynamic object and into the 1841 runtime process image. We need to remember the offset into the 1842 .rela.bss section we are going to use. */ 1843 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1844 { 1845 asection *srel; 1846 1847 if (h->size <= elf_gp_size (dynobj)) 1848 srel = bfd_get_section_by_name (dynobj, ".rela.sbss"); 1849 else 1850 srel = bfd_get_section_by_name (dynobj, ".rela.bss"); 1851 BFD_ASSERT (srel != NULL); 1852 srel->_raw_size += sizeof (Elf32_External_Rela); 1853 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; 1854 } 1855 1856 /* We need to figure out the alignment required for this symbol. I 1857 have no idea how ELF linkers handle this. */ 1858 power_of_two = bfd_log2 (h->size); 1859 if (power_of_two > 4) 1860 power_of_two = 4; 1861 1862 /* Apply the required alignment. */ 1863 s->_raw_size = BFD_ALIGN (s->_raw_size, 1864 (bfd_size_type) (1 << power_of_two)); 1865 if (power_of_two > bfd_get_section_alignment (dynobj, s)) 1866 { 1867 if (! bfd_set_section_alignment (dynobj, s, power_of_two)) 1868 return false; 1869 } 1870 1871 /* Define the symbol as being at this point in the section. */ 1872 h->root.u.def.section = s; 1873 h->root.u.def.value = s->_raw_size; 1874 1875 /* Increment the section size to make room for the symbol. */ 1876 s->_raw_size += h->size; 1877 1878 return true; 1879} 1880 1881 1882/* Set the sizes of the dynamic sections. */ 1883 1884static boolean 1885ppc_elf_size_dynamic_sections (output_bfd, info) 1886 bfd *output_bfd; 1887 struct bfd_link_info *info; 1888{ 1889 bfd *dynobj; 1890 asection *s; 1891 boolean plt; 1892 boolean relocs; 1893 boolean reltext; 1894 1895#ifdef DEBUG 1896 fprintf (stderr, "ppc_elf_size_dynamic_sections called\n"); 1897#endif 1898 1899 dynobj = elf_hash_table (info)->dynobj; 1900 BFD_ASSERT (dynobj != NULL); 1901 1902 if (elf_hash_table (info)->dynamic_sections_created) 1903 { 1904 /* Set the contents of the .interp section to the interpreter. */ 1905 if (! info->shared) 1906 { 1907 s = bfd_get_section_by_name (dynobj, ".interp"); 1908 BFD_ASSERT (s != NULL); 1909 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; 1910 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1911 } 1912 } 1913 else 1914 { 1915 /* We may have created entries in the .rela.got, .rela.sdata, and 1916 .rela.sdata2 sections. However, if we are not creating the 1917 dynamic sections, we will not actually use these entries. Reset 1918 the size of .rela.got, et al, which will cause it to get 1919 stripped from the output file below. */ 1920 static char *rela_sections[] = { ".rela.got", ".rela.sdata", 1921 ".rela.sdata2", ".rela.sbss", 1922 (char *)0 }; 1923 char **p; 1924 1925 for (p = rela_sections; *p != (char *)0; p++) 1926 { 1927 s = bfd_get_section_by_name (dynobj, *p); 1928 if (s != NULL) 1929 s->_raw_size = 0; 1930 } 1931 } 1932 1933 /* The check_relocs and adjust_dynamic_symbol entry points have 1934 determined the sizes of the various dynamic sections. Allocate 1935 memory for them. */ 1936 plt = false; 1937 relocs = false; 1938 reltext = false; 1939 for (s = dynobj->sections; s != NULL; s = s->next) 1940 { 1941 const char *name; 1942 boolean strip; 1943 1944 if ((s->flags & SEC_LINKER_CREATED) == 0) 1945 continue; 1946 1947 /* It's OK to base decisions on the section name, because none 1948 of the dynobj section names depend upon the input files. */ 1949 name = bfd_get_section_name (dynobj, s); 1950 1951 strip = false; 1952 1953 if (strcmp (name, ".plt") == 0) 1954 { 1955 if (s->_raw_size == 0) 1956 { 1957 /* Strip this section if we don't need it; see the 1958 comment below. */ 1959 strip = true; 1960 } 1961 else 1962 { 1963 /* Remember whether there is a PLT. */ 1964 plt = true; 1965 } 1966 } 1967 else if (strncmp (name, ".rela", 5) == 0) 1968 { 1969 if (s->_raw_size == 0) 1970 { 1971 /* If we don't need this section, strip it from the 1972 output file. This is mostly to handle .rela.bss and 1973 .rela.plt. We must create both sections in 1974 create_dynamic_sections, because they must be created 1975 before the linker maps input sections to output 1976 sections. The linker does that before 1977 adjust_dynamic_symbol is called, and it is that 1978 function which decides whether anything needs to go 1979 into these sections. */ 1980 strip = true; 1981 } 1982 else 1983 { 1984 asection *target; 1985 const char *outname; 1986 1987 /* Remember whether there are any relocation sections. */ 1988 relocs = true; 1989 1990 /* If this relocation section applies to a read only 1991 section, then we probably need a DT_TEXTREL entry. */ 1992 outname = bfd_get_section_name (output_bfd, 1993 s->output_section); 1994 target = bfd_get_section_by_name (output_bfd, outname + 5); 1995 if (target != NULL 1996 && (target->flags & SEC_READONLY) != 0 1997 && (target->flags & SEC_ALLOC) != 0) 1998 reltext = true; 1999 2000 /* We use the reloc_count field as a counter if we need 2001 to copy relocs into the output file. */ 2002 s->reloc_count = 0; 2003 } 2004 } 2005 else if (strcmp (name, ".got") != 0 2006 && strcmp (name, ".sdata") != 0 2007 && strcmp (name, ".sdata2") != 0) 2008 { 2009 /* It's not one of our sections, so don't allocate space. */ 2010 continue; 2011 } 2012 2013 if (strip) 2014 { 2015 _bfd_strip_section_from_output (info, s); 2016 continue; 2017 } 2018 2019 /* Allocate memory for the section contents. */ 2020 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); 2021 if (s->contents == NULL && s->_raw_size != 0) 2022 return false; 2023 } 2024 2025 if (elf_hash_table (info)->dynamic_sections_created) 2026 { 2027 /* Add some entries to the .dynamic section. We fill in the 2028 values later, in ppc_elf_finish_dynamic_sections, but we 2029 must add the entries now so that we get the correct size for 2030 the .dynamic section. The DT_DEBUG entry is filled in by the 2031 dynamic linker and used by the debugger. */ 2032 if (! info->shared) 2033 { 2034 if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) 2035 return false; 2036 } 2037 2038 if (plt) 2039 { 2040 if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) 2041 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) 2042 || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA) 2043 || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) 2044 return false; 2045 } 2046 2047 if (relocs) 2048 { 2049 if (! bfd_elf32_add_dynamic_entry (info, DT_RELA, 0) 2050 || ! bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0) 2051 || ! bfd_elf32_add_dynamic_entry (info, DT_RELAENT, 2052 sizeof (Elf32_External_Rela))) 2053 return false; 2054 } 2055 2056 if (reltext) 2057 { 2058 if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) 2059 return false; 2060 } 2061 } 2062 2063 return true; 2064} 2065 2066 2067/* Look through the relocs for a section during the first phase, and 2068 allocate space in the global offset table or procedure linkage 2069 table. */ 2070 2071static boolean 2072ppc_elf_check_relocs (abfd, info, sec, relocs) 2073 bfd *abfd; 2074 struct bfd_link_info *info; 2075 asection *sec; 2076 const Elf_Internal_Rela *relocs; 2077{ 2078 bfd *dynobj; 2079 Elf_Internal_Shdr *symtab_hdr; 2080 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 2081 const Elf_Internal_Rela *rel; 2082 const Elf_Internal_Rela *rel_end; 2083 bfd_signed_vma *local_got_refcounts; 2084 elf_linker_section_t *sdata; 2085 elf_linker_section_t *sdata2; 2086 asection *sreloc; 2087 asection *sgot = NULL; 2088 asection *srelgot = NULL; 2089 2090 if (info->relocateable) 2091 return true; 2092 2093#ifdef DEBUG 2094 fprintf (stderr, "ppc_elf_check_relocs called for section %s in %s\n", 2095 bfd_get_section_name (abfd, sec), 2096 bfd_get_filename (abfd)); 2097#endif 2098 2099 /* Create the linker generated sections all the time so that the 2100 special symbols are created. */ 2101 2102 if ((sdata = elf_linker_section (abfd, LINKER_SECTION_SDATA)) == NULL) 2103 { 2104 sdata = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA); 2105 if (!sdata) 2106 return false; 2107 } 2108 2109 2110 if ((sdata2 = elf_linker_section (abfd, LINKER_SECTION_SDATA2)) == NULL) 2111 { 2112 sdata2 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA2); 2113 if (!sdata2) 2114 return false; 2115 } 2116 2117 dynobj = elf_hash_table (info)->dynobj; 2118 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2119 local_got_refcounts = elf_local_got_refcounts (abfd); 2120 2121 sym_hashes = elf_sym_hashes (abfd); 2122 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym); 2123 if (!elf_bad_symtab (abfd)) 2124 sym_hashes_end -= symtab_hdr->sh_info; 2125 2126 sreloc = NULL; 2127 2128 rel_end = relocs + sec->reloc_count; 2129 for (rel = relocs; rel < rel_end; rel++) 2130 { 2131 unsigned long r_symndx; 2132 struct elf_link_hash_entry *h; 2133 2134 r_symndx = ELF32_R_SYM (rel->r_info); 2135 if (r_symndx < symtab_hdr->sh_info) 2136 h = NULL; 2137 else 2138 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2139 2140 /* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got. 2141 This shows up in particular in an R_PPC_ADDR32 in the eabi 2142 startup code. */ 2143 if (h && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 2144 { 2145 if (sgot == NULL) 2146 { 2147 if (dynobj == NULL) 2148 elf_hash_table (info)->dynobj = dynobj = abfd; 2149 if (! _bfd_elf_create_got_section (dynobj, info)) 2150 return false; 2151 sgot = bfd_get_section_by_name (dynobj, ".got"); 2152 BFD_ASSERT (sgot != NULL); 2153 } 2154 } 2155 2156 switch (ELF32_R_TYPE (rel->r_info)) 2157 { 2158 /* GOT16 relocations */ 2159 case R_PPC_GOT16: 2160 case R_PPC_GOT16_LO: 2161 case R_PPC_GOT16_HI: 2162 case R_PPC_GOT16_HA: 2163 /* This symbol requires a global offset table entry. */ 2164 2165 if (sgot == NULL) 2166 { 2167 if (dynobj == NULL) 2168 elf_hash_table (info)->dynobj = dynobj = abfd; 2169 if (! _bfd_elf_create_got_section (dynobj, info)) 2170 return false; 2171 sgot = bfd_get_section_by_name (dynobj, ".got"); 2172 BFD_ASSERT (sgot != NULL); 2173 } 2174 2175 if (srelgot == NULL 2176 && (h != NULL || info->shared)) 2177 { 2178 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 2179 if (srelgot == NULL) 2180 { 2181 srelgot = bfd_make_section (dynobj, ".rela.got"); 2182 if (srelgot == NULL 2183 || ! bfd_set_section_flags (dynobj, srelgot, 2184 (SEC_ALLOC 2185 | SEC_LOAD 2186 | SEC_HAS_CONTENTS 2187 | SEC_IN_MEMORY 2188 | SEC_LINKER_CREATED 2189 | SEC_READONLY)) 2190 || ! bfd_set_section_alignment (dynobj, srelgot, 2)) 2191 return false; 2192 } 2193 } 2194 2195 if (h != NULL) 2196 { 2197 if (h->got.refcount == -1) 2198 { 2199 /* Make sure this symbol is output as a dynamic symbol. */ 2200 if (h->dynindx == -1) 2201 if (!bfd_elf32_link_record_dynamic_symbol (info, h)) 2202 return false; 2203 2204 /* Allocate space in the .got. */ 2205 sgot->_raw_size += 4; 2206 /* Allocate relocation space. */ 2207 srelgot->_raw_size += sizeof (Elf32_External_Rela); 2208 2209 h->got.refcount = 1; 2210 } 2211 else 2212 h->got.refcount++; 2213 } 2214 else 2215 { 2216 /* This is a global offset table entry for a local symbol. */ 2217 if (local_got_refcounts == NULL) 2218 { 2219 size_t size; 2220 2221 size = symtab_hdr->sh_info * sizeof (bfd_signed_vma); 2222 local_got_refcounts = (bfd_signed_vma *) 2223 bfd_alloc (abfd, size); 2224 if (local_got_refcounts == NULL) 2225 return false; 2226 elf_local_got_refcounts (abfd) = local_got_refcounts; 2227 memset (local_got_refcounts, -1, size); 2228 } 2229 if (local_got_refcounts[r_symndx] == -1) 2230 { 2231 sgot->_raw_size += 4; 2232 2233 /* If we are generating a shared object, we need to 2234 output a R_PPC_RELATIVE reloc so that the 2235 dynamic linker can adjust this GOT entry. */ 2236 if (info->shared) 2237 srelgot->_raw_size += sizeof (Elf32_External_Rela); 2238 2239 local_got_refcounts[r_symndx] = 1; 2240 } 2241 else 2242 local_got_refcounts[r_symndx]++; 2243 } 2244 break; 2245 2246 /* Indirect .sdata relocation */ 2247 case R_PPC_EMB_SDAI16: 2248 if (info->shared) 2249 { 2250 ((*_bfd_error_handler) 2251 (_("%s: relocation %s cannot be used when making a shared object"), 2252 bfd_get_filename (abfd), "R_PPC_EMB_SDAI16")); 2253 return false; 2254 } 2255 2256 if (srelgot == NULL && (h != NULL || info->shared)) 2257 { 2258 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 2259 if (srelgot == NULL) 2260 { 2261 srelgot = bfd_make_section (dynobj, ".rela.got"); 2262 if (srelgot == NULL 2263 || ! bfd_set_section_flags (dynobj, srelgot, 2264 (SEC_ALLOC 2265 | SEC_LOAD 2266 | SEC_HAS_CONTENTS 2267 | SEC_IN_MEMORY 2268 | SEC_LINKER_CREATED 2269 | SEC_READONLY)) 2270 || ! bfd_set_section_alignment (dynobj, srelgot, 2)) 2271 return false; 2272 } 2273 } 2274 2275 if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata, h, rel)) 2276 return false; 2277 2278 break; 2279 2280 /* Indirect .sdata2 relocation */ 2281 case R_PPC_EMB_SDA2I16: 2282 if (info->shared) 2283 { 2284 ((*_bfd_error_handler) 2285 (_("%s: relocation %s cannot be used when making a shared object"), 2286 bfd_get_filename (abfd), "R_PPC_EMB_SDA2I16")); 2287 return false; 2288 } 2289 2290 if (srelgot == NULL && (h != NULL || info->shared)) 2291 { 2292 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 2293 if (srelgot == NULL) 2294 { 2295 srelgot = bfd_make_section (dynobj, ".rela.got"); 2296 if (srelgot == NULL 2297 || ! bfd_set_section_flags (dynobj, srelgot, 2298 (SEC_ALLOC 2299 | SEC_LOAD 2300 | SEC_HAS_CONTENTS 2301 | SEC_IN_MEMORY 2302 | SEC_LINKER_CREATED 2303 | SEC_READONLY)) 2304 || ! bfd_set_section_alignment (dynobj, srelgot, 2)) 2305 return false; 2306 } 2307 } 2308 2309 if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata2, h, rel)) 2310 return false; 2311 2312 break; 2313 2314 case R_PPC_SDAREL16: 2315 case R_PPC_EMB_SDA2REL: 2316 case R_PPC_EMB_SDA21: 2317 if (info->shared) 2318 { 2319 ((*_bfd_error_handler) 2320 (_("%s: relocation %s cannot be used when making a shared object"), 2321 bfd_get_filename (abfd), 2322 ppc_elf_howto_table[(int)ELF32_R_TYPE (rel->r_info)]->name)); 2323 return false; 2324 } 2325 break; 2326 2327 case R_PPC_PLT32: 2328 case R_PPC_PLTREL24: 2329 case R_PPC_PLT16_LO: 2330 case R_PPC_PLT16_HI: 2331 case R_PPC_PLT16_HA: 2332#ifdef DEBUG 2333 fprintf (stderr, "Reloc requires a PLT entry\n"); 2334#endif 2335 /* This symbol requires a procedure linkage table entry. We 2336 actually build the entry in adjust_dynamic_symbol, 2337 because this might be a case of linking PIC code without 2338 linking in any dynamic objects, in which case we don't 2339 need to generate a procedure linkage table after all. */ 2340 2341 if (h == NULL) 2342 { 2343 /* It does not make sense to have a procedure linkage 2344 table entry for a local symbol. */ 2345 bfd_set_error (bfd_error_bad_value); 2346 return false; 2347 } 2348 2349 /* Make sure this symbol is output as a dynamic symbol. */ 2350 if (h->dynindx == -1) 2351 { 2352 if (! bfd_elf32_link_record_dynamic_symbol (info, h)) 2353 return false; 2354 } 2355 if (h->plt.refcount == -1) 2356 { 2357 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; 2358 h->plt.refcount = 1; 2359 } 2360 else 2361 h->plt.refcount++; 2362 break; 2363 2364 /* The following relocations don't need to propagate the 2365 relocation if linking a shared object since they are 2366 section relative. */ 2367 case R_PPC_SECTOFF: 2368 case R_PPC_SECTOFF_LO: 2369 case R_PPC_SECTOFF_HI: 2370 case R_PPC_SECTOFF_HA: 2371 break; 2372 2373 /* This refers only to functions defined in the shared library */ 2374 case R_PPC_LOCAL24PC: 2375 break; 2376 2377 /* This relocation describes the C++ object vtable hierarchy. 2378 Reconstruct it for later use during GC. */ 2379 case R_PPC_GNU_VTINHERIT: 2380 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2381 return false; 2382 break; 2383 2384 /* This relocation describes which C++ vtable entries are actually 2385 used. Record for later use during GC. */ 2386 case R_PPC_GNU_VTENTRY: 2387 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2388 return false; 2389 break; 2390 2391 /* When creating a shared object, we must copy these 2392 relocs into the output file. We create a reloc 2393 section in dynobj and make room for the reloc. */ 2394 case R_PPC_REL24: 2395 case R_PPC_REL14: 2396 case R_PPC_REL14_BRTAKEN: 2397 case R_PPC_REL14_BRNTAKEN: 2398 case R_PPC_REL32: 2399 if (h == NULL 2400 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 2401 break; 2402 /* fall through */ 2403 2404 default: 2405 if (info->shared) 2406 { 2407#ifdef DEBUG 2408 fprintf (stderr, "ppc_elf_check_relocs need to create relocation for %s\n", 2409 (h && h->root.root.string) ? h->root.root.string : "<unknown>"); 2410#endif 2411 if (sreloc == NULL) 2412 { 2413 const char *name; 2414 2415 name = (bfd_elf_string_from_elf_section 2416 (abfd, 2417 elf_elfheader (abfd)->e_shstrndx, 2418 elf_section_data (sec)->rel_hdr.sh_name)); 2419 if (name == NULL) 2420 return false; 2421 2422 BFD_ASSERT (strncmp (name, ".rela", 5) == 0 2423 && strcmp (bfd_get_section_name (abfd, sec), 2424 name + 5) == 0); 2425 2426 sreloc = bfd_get_section_by_name (dynobj, name); 2427 if (sreloc == NULL) 2428 { 2429 flagword flags; 2430 2431 sreloc = bfd_make_section (dynobj, name); 2432 flags = (SEC_HAS_CONTENTS | SEC_READONLY 2433 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 2434 if ((sec->flags & SEC_ALLOC) != 0) 2435 flags |= SEC_ALLOC | SEC_LOAD; 2436 if (sreloc == NULL 2437 || ! bfd_set_section_flags (dynobj, sreloc, flags) 2438 || ! bfd_set_section_alignment (dynobj, sreloc, 2)) 2439 return false; 2440 } 2441 } 2442 2443 sreloc->_raw_size += sizeof (Elf32_External_Rela); 2444 2445 /* FIXME: We should here do what the m68k and i386 2446 backends do: if the reloc is pc-relative, record it 2447 in case it turns out that the reloc is unnecessary 2448 because the symbol is forced local by versioning or 2449 we are linking with -Bdynamic. Fortunately this 2450 case is not frequent. */ 2451 } 2452 2453 break; 2454 } 2455 } 2456 2457 return true; 2458} 2459 2460/* Return the section that should be marked against GC for a given 2461 relocation. */ 2462 2463static asection * 2464ppc_elf_gc_mark_hook (abfd, info, rel, h, sym) 2465 bfd *abfd; 2466 struct bfd_link_info *info ATTRIBUTE_UNUSED; 2467 Elf_Internal_Rela *rel; 2468 struct elf_link_hash_entry *h; 2469 Elf_Internal_Sym *sym; 2470{ 2471 if (h != NULL) 2472 { 2473 switch (ELF32_R_TYPE (rel->r_info)) 2474 { 2475 case R_PPC_GNU_VTINHERIT: 2476 case R_PPC_GNU_VTENTRY: 2477 break; 2478 2479 default: 2480 switch (h->root.type) 2481 { 2482 case bfd_link_hash_defined: 2483 case bfd_link_hash_defweak: 2484 return h->root.u.def.section; 2485 2486 case bfd_link_hash_common: 2487 return h->root.u.c.p->section; 2488 2489 default: 2490 break; 2491 } 2492 } 2493 } 2494 else 2495 { 2496 if (!(elf_bad_symtab (abfd) 2497 && ELF_ST_BIND (sym->st_info) != STB_LOCAL) 2498 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) 2499 && sym->st_shndx != SHN_COMMON)) 2500 { 2501 return bfd_section_from_elf_index (abfd, sym->st_shndx); 2502 } 2503 } 2504 2505 return NULL; 2506} 2507 2508/* Update the got entry reference counts for the section being removed. */ 2509 2510static boolean 2511ppc_elf_gc_sweep_hook (abfd, info, sec, relocs) 2512 bfd *abfd; 2513 struct bfd_link_info *info ATTRIBUTE_UNUSED; 2514 asection *sec; 2515 const Elf_Internal_Rela *relocs; 2516{ 2517 Elf_Internal_Shdr *symtab_hdr; 2518 struct elf_link_hash_entry **sym_hashes; 2519 bfd_signed_vma *local_got_refcounts; 2520 const Elf_Internal_Rela *rel, *relend; 2521 unsigned long r_symndx; 2522 struct elf_link_hash_entry *h; 2523 2524 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2525 sym_hashes = elf_sym_hashes (abfd); 2526 local_got_refcounts = elf_local_got_refcounts (abfd); 2527 2528 relend = relocs + sec->reloc_count; 2529 for (rel = relocs; rel < relend; rel++) 2530 switch (ELF32_R_TYPE (rel->r_info)) 2531 { 2532 case R_PPC_GOT16: 2533 case R_PPC_GOT16_LO: 2534 case R_PPC_GOT16_HI: 2535 case R_PPC_GOT16_HA: 2536 r_symndx = ELF32_R_SYM (rel->r_info); 2537 if (r_symndx >= symtab_hdr->sh_info) 2538 { 2539 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2540 if (h->got.refcount > 0) 2541 h->got.refcount--; 2542 } 2543 else 2544 { 2545 if (local_got_refcounts[r_symndx] > 0) 2546 local_got_refcounts[r_symndx]--; 2547 } 2548 break; 2549 2550 case R_PPC_PLT32: 2551 case R_PPC_PLTREL24: 2552 case R_PPC_PLT16_LO: 2553 case R_PPC_PLT16_HI: 2554 case R_PPC_PLT16_HA: 2555 r_symndx = ELF32_R_SYM (rel->r_info); 2556 if (r_symndx >= symtab_hdr->sh_info) 2557 { 2558 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2559 if (h->plt.refcount > 0) 2560 h->plt.refcount--; 2561 } 2562 break; 2563 2564 default: 2565 break; 2566 } 2567 2568 return true; 2569} 2570 2571/* Hook called by the linker routine which adds symbols from an object 2572 file. We use it to put .comm items in .sbss, and not .bss. */ 2573 2574/*ARGSUSED*/ 2575static boolean 2576ppc_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp) 2577 bfd *abfd; 2578 struct bfd_link_info *info; 2579 const Elf_Internal_Sym *sym; 2580 const char **namep ATTRIBUTE_UNUSED; 2581 flagword *flagsp ATTRIBUTE_UNUSED; 2582 asection **secp; 2583 bfd_vma *valp; 2584{ 2585 if (sym->st_shndx == SHN_COMMON 2586 && !info->relocateable 2587 && sym->st_size <= (bfd_vma) bfd_get_gp_size (abfd)) 2588 { 2589 /* Common symbols less than or equal to -G nn bytes are automatically 2590 put into .sdata. */ 2591 elf_linker_section_t *sdata 2592 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA); 2593 2594 if (!sdata->bss_section) 2595 { 2596 /* We don't go through bfd_make_section, because we don't 2597 want to attach this common section to DYNOBJ. The linker 2598 will move the symbols to the appropriate output section 2599 when it defines common symbols. */ 2600 sdata->bss_section = ((asection *) 2601 bfd_zalloc (abfd, sizeof (asection))); 2602 if (sdata->bss_section == NULL) 2603 return false; 2604 sdata->bss_section->name = sdata->bss_name; 2605 sdata->bss_section->flags = SEC_IS_COMMON; 2606 sdata->bss_section->output_section = sdata->bss_section; 2607 sdata->bss_section->symbol = 2608 (asymbol *) bfd_zalloc (abfd, sizeof (asymbol)); 2609 sdata->bss_section->symbol_ptr_ptr = 2610 (asymbol **) bfd_zalloc (abfd, sizeof (asymbol *)); 2611 if (sdata->bss_section->symbol == NULL 2612 || sdata->bss_section->symbol_ptr_ptr == NULL) 2613 return false; 2614 sdata->bss_section->symbol->name = sdata->bss_name; 2615 sdata->bss_section->symbol->flags = BSF_SECTION_SYM; 2616 sdata->bss_section->symbol->section = sdata->bss_section; 2617 *sdata->bss_section->symbol_ptr_ptr = sdata->bss_section->symbol; 2618 } 2619 2620 *secp = sdata->bss_section; 2621 *valp = sym->st_size; 2622 } 2623 2624 return true; 2625} 2626 2627 2628/* Finish up dynamic symbol handling. We set the contents of various 2629 dynamic sections here. */ 2630 2631static boolean 2632ppc_elf_finish_dynamic_symbol (output_bfd, info, h, sym) 2633 bfd *output_bfd; 2634 struct bfd_link_info *info; 2635 struct elf_link_hash_entry *h; 2636 Elf_Internal_Sym *sym; 2637{ 2638 bfd *dynobj; 2639 2640#ifdef DEBUG 2641 fprintf (stderr, "ppc_elf_finish_dynamic_symbol called for %s", 2642 h->root.root.string); 2643#endif 2644 2645 dynobj = elf_hash_table (info)->dynobj; 2646 BFD_ASSERT (dynobj != NULL); 2647 2648 if (h->plt.offset != (bfd_vma) -1) 2649 { 2650 asection *splt; 2651 asection *srela; 2652 Elf_Internal_Rela rela; 2653 bfd_vma reloc_index; 2654 2655#ifdef DEBUG 2656 fprintf (stderr, ", plt_offset = %d", h->plt.offset); 2657#endif 2658 2659 /* This symbol has an entry in the procedure linkage table. Set 2660 it up. */ 2661 2662 BFD_ASSERT (h->dynindx != -1); 2663 2664 splt = bfd_get_section_by_name (dynobj, ".plt"); 2665 srela = bfd_get_section_by_name (dynobj, ".rela.plt"); 2666 BFD_ASSERT (splt != NULL && srela != NULL); 2667 2668 /* We don't need to fill in the .plt. The ppc dynamic linker 2669 will fill it in. */ 2670 2671 /* Fill in the entry in the .rela.plt section. */ 2672 rela.r_offset = (splt->output_section->vma 2673 + splt->output_offset 2674 + h->plt.offset); 2675 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_JMP_SLOT); 2676 rela.r_addend = 0; 2677 2678 reloc_index = (h->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_SLOT_SIZE; 2679 if (reloc_index > PLT_NUM_SINGLE_ENTRIES) 2680 reloc_index -= (reloc_index - PLT_NUM_SINGLE_ENTRIES) / 2; 2681 bfd_elf32_swap_reloca_out (output_bfd, &rela, 2682 ((Elf32_External_Rela *) srela->contents 2683 + reloc_index)); 2684 2685 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 2686 { 2687 /* Mark the symbol as undefined, rather than as defined in 2688 the .plt section. Leave the value alone. */ 2689 sym->st_shndx = SHN_UNDEF; 2690 } 2691 } 2692 2693 if (h->got.offset != (bfd_vma) -1) 2694 { 2695 asection *sgot; 2696 asection *srela; 2697 Elf_Internal_Rela rela; 2698 2699 /* This symbol has an entry in the global offset table. Set it 2700 up. */ 2701 2702 sgot = bfd_get_section_by_name (dynobj, ".got"); 2703 srela = bfd_get_section_by_name (dynobj, ".rela.got"); 2704 BFD_ASSERT (sgot != NULL && srela != NULL); 2705 2706 rela.r_offset = (sgot->output_section->vma 2707 + sgot->output_offset 2708 + (h->got.offset &~ 1)); 2709 2710 /* If this is a -Bsymbolic link, and the symbol is defined 2711 locally, we just want to emit a RELATIVE reloc. The entry in 2712 the global offset table will already have been initialized in 2713 the relocate_section function. */ 2714 if (info->shared 2715 && (info->symbolic || h->dynindx == -1) 2716 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) 2717 { 2718 rela.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE); 2719 rela.r_addend = (h->root.u.def.value 2720 + h->root.u.def.section->output_section->vma 2721 + h->root.u.def.section->output_offset); 2722 } 2723 else 2724 { 2725 BFD_ASSERT((h->got.offset & 1) == 0); 2726 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); 2727 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_GLOB_DAT); 2728 rela.r_addend = 0; 2729 } 2730 2731 bfd_elf32_swap_reloca_out (output_bfd, &rela, 2732 ((Elf32_External_Rela *) srela->contents 2733 + srela->reloc_count)); 2734 ++srela->reloc_count; 2735 } 2736 2737 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) 2738 { 2739 asection *s; 2740 Elf_Internal_Rela rela; 2741 2742 /* This symbols needs a copy reloc. Set it up. */ 2743 2744#ifdef DEBUG 2745 fprintf (stderr, ", copy"); 2746#endif 2747 2748 BFD_ASSERT (h->dynindx != -1); 2749 2750 if (h->size <= elf_gp_size (dynobj)) 2751 s = bfd_get_section_by_name (h->root.u.def.section->owner, 2752 ".rela.sbss"); 2753 else 2754 s = bfd_get_section_by_name (h->root.u.def.section->owner, 2755 ".rela.bss"); 2756 BFD_ASSERT (s != NULL); 2757 2758 rela.r_offset = (h->root.u.def.value 2759 + h->root.u.def.section->output_section->vma 2760 + h->root.u.def.section->output_offset); 2761 rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_COPY); 2762 rela.r_addend = 0; 2763 bfd_elf32_swap_reloca_out (output_bfd, &rela, 2764 ((Elf32_External_Rela *) s->contents 2765 + s->reloc_count)); 2766 ++s->reloc_count; 2767 } 2768 2769#ifdef DEBUG 2770 fprintf (stderr, "\n"); 2771#endif 2772 2773 /* Mark some specially defined symbols as absolute. */ 2774 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 2775 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0 2776 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0) 2777 sym->st_shndx = SHN_ABS; 2778 2779 return true; 2780} 2781 2782 2783/* Finish up the dynamic sections. */ 2784 2785static boolean 2786ppc_elf_finish_dynamic_sections (output_bfd, info) 2787 bfd *output_bfd; 2788 struct bfd_link_info *info; 2789{ 2790 asection *sdyn; 2791 bfd *dynobj = elf_hash_table (info)->dynobj; 2792 asection *sgot = bfd_get_section_by_name (dynobj, ".got"); 2793 2794#ifdef DEBUG 2795 fprintf (stderr, "ppc_elf_finish_dynamic_sections called\n"); 2796#endif 2797 2798 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 2799 2800 if (elf_hash_table (info)->dynamic_sections_created) 2801 { 2802 asection *splt; 2803 Elf32_External_Dyn *dyncon, *dynconend; 2804 2805 splt = bfd_get_section_by_name (dynobj, ".plt"); 2806 BFD_ASSERT (splt != NULL && sdyn != NULL); 2807 2808 dyncon = (Elf32_External_Dyn *) sdyn->contents; 2809 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); 2810 for (; dyncon < dynconend; dyncon++) 2811 { 2812 Elf_Internal_Dyn dyn; 2813 const char *name; 2814 boolean size; 2815 2816 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 2817 2818 switch (dyn.d_tag) 2819 { 2820 case DT_PLTGOT: name = ".plt"; size = false; break; 2821 case DT_PLTRELSZ: name = ".rela.plt"; size = true; break; 2822 case DT_JMPREL: name = ".rela.plt"; size = false; break; 2823 default: name = NULL; size = false; break; 2824 } 2825 2826 if (name != NULL) 2827 { 2828 asection *s; 2829 2830 s = bfd_get_section_by_name (output_bfd, name); 2831 if (s == NULL) 2832 dyn.d_un.d_val = 0; 2833 else 2834 { 2835 if (! size) 2836 dyn.d_un.d_ptr = s->vma; 2837 else 2838 { 2839 if (s->_cooked_size != 0) 2840 dyn.d_un.d_val = s->_cooked_size; 2841 else 2842 dyn.d_un.d_val = s->_raw_size; 2843 } 2844 } 2845 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2846 } 2847 } 2848 } 2849 2850 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can 2851 easily find the address of the _GLOBAL_OFFSET_TABLE_. */ 2852 if (sgot) 2853 { 2854 unsigned char *contents = sgot->contents; 2855 bfd_put_32 (output_bfd, 0x4e800021 /* blrl */, contents); 2856 2857 if (sdyn == NULL) 2858 bfd_put_32 (output_bfd, (bfd_vma) 0, contents+4); 2859 else 2860 bfd_put_32 (output_bfd, 2861 sdyn->output_section->vma + sdyn->output_offset, 2862 contents+4); 2863 2864 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2865 } 2866 2867 return true; 2868} 2869 2870 2871/* The RELOCATE_SECTION function is called by the ELF backend linker 2872 to handle the relocations for a section. 2873 2874 The relocs are always passed as Rela structures; if the section 2875 actually uses Rel structures, the r_addend field will always be 2876 zero. 2877 2878 This function is responsible for adjust the section contents as 2879 necessary, and (if using Rela relocs and generating a 2880 relocateable output file) adjusting the reloc addend as 2881 necessary. 2882 2883 This function does not have to worry about setting the reloc 2884 address or the reloc symbol index. 2885 2886 LOCAL_SYMS is a pointer to the swapped in local symbols. 2887 2888 LOCAL_SECTIONS is an array giving the section in the input file 2889 corresponding to the st_shndx field of each local symbol. 2890 2891 The global hash table entry for the global symbols can be found 2892 via elf_sym_hashes (input_bfd). 2893 2894 When generating relocateable output, this function must handle 2895 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 2896 going to be the section symbol corresponding to the output 2897 section, which means that the addend must be adjusted 2898 accordingly. */ 2899 2900static boolean 2901ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section, 2902 contents, relocs, local_syms, local_sections) 2903 bfd *output_bfd; 2904 struct bfd_link_info *info; 2905 bfd *input_bfd; 2906 asection *input_section; 2907 bfd_byte *contents; 2908 Elf_Internal_Rela *relocs; 2909 Elf_Internal_Sym *local_syms; 2910 asection **local_sections; 2911{ 2912 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2913 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); 2914 bfd *dynobj = elf_hash_table (info)->dynobj; 2915 elf_linker_section_t *sdata = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA) : NULL; 2916 elf_linker_section_t *sdata2 = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA2) : NULL; 2917 Elf_Internal_Rela *rel = relocs; 2918 Elf_Internal_Rela *relend = relocs + input_section->reloc_count; 2919 asection *sreloc = NULL; 2920 asection *splt; 2921 asection *sgot; 2922 bfd_vma *local_got_offsets; 2923 boolean ret = true; 2924 long insn; 2925 2926#ifdef DEBUG 2927 fprintf (stderr, "ppc_elf_relocate_section called for %s section %s, %ld relocations%s\n", 2928 bfd_get_filename (input_bfd), 2929 bfd_section_name(input_bfd, input_section), 2930 (long)input_section->reloc_count, 2931 (info->relocateable) ? " (relocatable)" : ""); 2932#endif 2933 2934 if (!ppc_elf_howto_table[ R_PPC_ADDR32 ]) /* Initialize howto table if needed */ 2935 ppc_elf_howto_init (); 2936 2937 local_got_offsets = elf_local_got_offsets (input_bfd); 2938 2939 splt = sgot = NULL; 2940 if (dynobj != NULL) 2941 { 2942 splt = bfd_get_section_by_name (dynobj, ".plt"); 2943 sgot = bfd_get_section_by_name (dynobj, ".got"); 2944 } 2945 2946 for (; rel < relend; rel++) 2947 { 2948 enum elf_ppc_reloc_type r_type = (enum elf_ppc_reloc_type)ELF32_R_TYPE (rel->r_info); 2949 bfd_vma offset = rel->r_offset; 2950 bfd_vma addend = rel->r_addend; 2951 bfd_reloc_status_type r = bfd_reloc_other; 2952 Elf_Internal_Sym *sym = (Elf_Internal_Sym *)0; 2953 asection *sec = (asection *)0; 2954 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *)0; 2955 const char *sym_name = (const char *)0; 2956 reloc_howto_type *howto; 2957 unsigned long r_symndx; 2958 bfd_vma relocation; 2959 2960 /* Unknown relocation handling */ 2961 if ((unsigned)r_type >= (unsigned)R_PPC_max || !ppc_elf_howto_table[(int)r_type]) 2962 { 2963 (*_bfd_error_handler) (_("%s: unknown relocation type %d"), 2964 bfd_get_filename (input_bfd), 2965 (int)r_type); 2966 2967 bfd_set_error (bfd_error_bad_value); 2968 ret = false; 2969 continue; 2970 } 2971 2972 howto = ppc_elf_howto_table[(int)r_type]; 2973 r_symndx = ELF32_R_SYM (rel->r_info); 2974 2975 if (info->relocateable) 2976 { 2977 /* This is a relocateable link. We don't have to change 2978 anything, unless the reloc is against a section symbol, 2979 in which case we have to adjust according to where the 2980 section symbol winds up in the output section. */ 2981 if (r_symndx < symtab_hdr->sh_info) 2982 { 2983 sym = local_syms + r_symndx; 2984 if ((unsigned)ELF_ST_TYPE (sym->st_info) == STT_SECTION) 2985 { 2986 sec = local_sections[r_symndx]; 2987 addend = rel->r_addend += sec->output_offset + sym->st_value; 2988 } 2989 } 2990 2991#ifdef DEBUG 2992 fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n", 2993 howto->name, 2994 (int)r_type, 2995 r_symndx, 2996 (long)offset, 2997 (long)addend); 2998#endif 2999 continue; 3000 } 3001 3002 /* This is a final link. */ 3003 if (r_symndx < symtab_hdr->sh_info) 3004 { 3005 sym = local_syms + r_symndx; 3006 sec = local_sections[r_symndx]; 3007 sym_name = "<local symbol>"; 3008 3009 relocation = (sec->output_section->vma 3010 + sec->output_offset 3011 + sym->st_value); 3012 } 3013 else 3014 { 3015 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 3016 while (h->root.type == bfd_link_hash_indirect 3017 || h->root.type == bfd_link_hash_warning) 3018 h = (struct elf_link_hash_entry *) h->root.u.i.link; 3019 sym_name = h->root.root.string; 3020 if (h->root.type == bfd_link_hash_defined 3021 || h->root.type == bfd_link_hash_defweak) 3022 { 3023 sec = h->root.u.def.section; 3024 if ((r_type == R_PPC_PLT32 3025 && h->plt.offset != (bfd_vma) -1) 3026 || (r_type == R_PPC_LOCAL24PC 3027 && sec->output_section == NULL) 3028 || ((r_type == R_PPC_GOT16 3029 || r_type == R_PPC_GOT16_LO 3030 || r_type == R_PPC_GOT16_HI 3031 || r_type == R_PPC_GOT16_HA) 3032 && elf_hash_table (info)->dynamic_sections_created 3033 && (! info->shared 3034 || (! info->symbolic && h->dynindx != -1) 3035 || (h->elf_link_hash_flags 3036 & ELF_LINK_HASH_DEF_REGULAR) == 0)) 3037 || (info->shared 3038 && ((! info->symbolic && h->dynindx != -1) 3039 || (h->elf_link_hash_flags 3040 & ELF_LINK_HASH_DEF_REGULAR) == 0) 3041 && ((input_section->flags & SEC_ALLOC) != 0 3042 /* Testing SEC_DEBUGGING here may be wrong. 3043 It's here to avoid a crash when 3044 generating a shared library with DWARF 3045 debugging information. */ 3046 || (input_section->flags & SEC_DEBUGGING) != 0) 3047 && (r_type == R_PPC_ADDR32 3048 || r_type == R_PPC_ADDR24 3049 || r_type == R_PPC_ADDR16 3050 || r_type == R_PPC_ADDR16_LO 3051 || r_type == R_PPC_ADDR16_HI 3052 || r_type == R_PPC_ADDR16_HA 3053 || r_type == R_PPC_ADDR14 3054 || r_type == R_PPC_ADDR14_BRTAKEN 3055 || r_type == R_PPC_ADDR14_BRNTAKEN 3056 || r_type == R_PPC_PLTREL24 3057 || r_type == R_PPC_COPY 3058 || r_type == R_PPC_GLOB_DAT 3059 || r_type == R_PPC_JMP_SLOT 3060 || r_type == R_PPC_UADDR32 3061 || r_type == R_PPC_UADDR16 3062 || r_type == R_PPC_SDAREL16 3063 || r_type == R_PPC_EMB_NADDR32 3064 || r_type == R_PPC_EMB_NADDR16 3065 || r_type == R_PPC_EMB_NADDR16_LO 3066 || r_type == R_PPC_EMB_NADDR16_HI 3067 || r_type == R_PPC_EMB_NADDR16_HA 3068 || r_type == R_PPC_EMB_SDAI16 3069 || r_type == R_PPC_EMB_SDA2I16 3070 || r_type == R_PPC_EMB_SDA2REL 3071 || r_type == R_PPC_EMB_SDA21 3072 || r_type == R_PPC_EMB_MRKREF 3073 || r_type == R_PPC_EMB_BIT_FLD 3074 || r_type == R_PPC_EMB_RELSDA 3075 || ((r_type == R_PPC_REL24 3076 || r_type == R_PPC_REL32 3077 || r_type == R_PPC_REL14 3078 || r_type == R_PPC_REL14_BRTAKEN 3079 || r_type == R_PPC_REL14_BRNTAKEN 3080 || r_type == R_PPC_RELATIVE) 3081 && strcmp (h->root.root.string, 3082 "_GLOBAL_OFFSET_TABLE_") != 0)))) 3083 { 3084 /* In these cases, we don't need the relocation 3085 value. We check specially because in some 3086 obscure cases sec->output_section will be NULL. */ 3087 relocation = 0; 3088 } 3089 else if (sec->output_section == NULL) 3090 { 3091 (*_bfd_error_handler) 3092 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), 3093 bfd_get_filename (input_bfd), h->root.root.string, 3094 bfd_get_section_name (input_bfd, input_section)); 3095 relocation = 0; 3096 } 3097 else 3098 relocation = (h->root.u.def.value 3099 + sec->output_section->vma 3100 + sec->output_offset); 3101 } 3102 else if (h->root.type == bfd_link_hash_undefweak) 3103 relocation = 0; 3104 else if (info->shared && !info->symbolic && !info->no_undefined) 3105 relocation = 0; 3106 else 3107 { 3108 if (! (*info->callbacks->undefined_symbol)(info, 3109 h->root.root.string, 3110 input_bfd, 3111 input_section, 3112 rel->r_offset, 3113 (!info->shared 3114 || info->no_undefined))) 3115 return false; 3116 relocation = 0; 3117 } 3118 } 3119 3120 switch ((int)r_type) 3121 { 3122 default: 3123 (*_bfd_error_handler) (_("%s: unknown relocation type %d for symbol %s"), 3124 bfd_get_filename (input_bfd), 3125 (int)r_type, sym_name); 3126 3127 bfd_set_error (bfd_error_bad_value); 3128 ret = false; 3129 continue; 3130 3131 /* Relocations that need no special processing. */ 3132 case (int)R_PPC_LOCAL24PC: 3133 /* It makes no sense to point a local relocation 3134 at a symbol not in this object. */ 3135 if (h != NULL 3136 && (h->root.type == bfd_link_hash_defined 3137 || h->root.type == bfd_link_hash_defweak) 3138 && sec->output_section == NULL) 3139 { 3140 if (! (*info->callbacks->undefined_symbol) (info, 3141 h->root.root.string, 3142 input_bfd, 3143 input_section, 3144 rel->r_offset, 3145 true)) 3146 return false; 3147 continue; 3148 } 3149 break; 3150 3151 /* Relocations that may need to be propagated if this is a shared 3152 object. */ 3153 case (int)R_PPC_REL24: 3154 case (int)R_PPC_REL32: 3155 case (int)R_PPC_REL14: 3156 /* If these relocations are not to a named symbol, they can be 3157 handled right here, no need to bother the dynamic linker. */ 3158 if (h == NULL 3159 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 3160 break; 3161 /* fall through */ 3162 3163 /* Relocations that always need to be propagated if this is a shared 3164 object. */ 3165 case (int)R_PPC_NONE: 3166 case (int)R_PPC_ADDR32: 3167 case (int)R_PPC_ADDR24: 3168 case (int)R_PPC_ADDR16: 3169 case (int)R_PPC_ADDR16_LO: 3170 case (int)R_PPC_ADDR16_HI: 3171 case (int)R_PPC_ADDR16_HA: 3172 case (int)R_PPC_ADDR14: 3173 case (int)R_PPC_UADDR32: 3174 case (int)R_PPC_UADDR16: 3175 if (info->shared) 3176 { 3177 Elf_Internal_Rela outrel; 3178 boolean skip; 3179 3180#ifdef DEBUG 3181 fprintf (stderr, "ppc_elf_relocate_section need to create relocation for %s\n", 3182 (h && h->root.root.string) ? h->root.root.string : "<unknown>"); 3183#endif 3184 3185 /* When generating a shared object, these relocations 3186 are copied into the output file to be resolved at run 3187 time. */ 3188 3189 if (sreloc == NULL) 3190 { 3191 const char *name; 3192 3193 name = (bfd_elf_string_from_elf_section 3194 (input_bfd, 3195 elf_elfheader (input_bfd)->e_shstrndx, 3196 elf_section_data (input_section)->rel_hdr.sh_name)); 3197 if (name == NULL) 3198 return false; 3199 3200 BFD_ASSERT (strncmp (name, ".rela", 5) == 0 3201 && strcmp (bfd_get_section_name (input_bfd, 3202 input_section), 3203 name + 5) == 0); 3204 3205 sreloc = bfd_get_section_by_name (dynobj, name); 3206 BFD_ASSERT (sreloc != NULL); 3207 } 3208 3209 skip = false; 3210 3211 if (elf_section_data (input_section)->stab_info == NULL) 3212 outrel.r_offset = rel->r_offset; 3213 else 3214 { 3215 bfd_vma off; 3216 3217 off = (_bfd_stab_section_offset 3218 (output_bfd, &elf_hash_table (info)->stab_info, 3219 input_section, 3220 &elf_section_data (input_section)->stab_info, 3221 rel->r_offset)); 3222 if (off == (bfd_vma) -1) 3223 skip = true; 3224 outrel.r_offset = off; 3225 } 3226 3227 outrel.r_offset += (input_section->output_section->vma 3228 + input_section->output_offset); 3229 3230 if (skip) 3231 memset (&outrel, 0, sizeof outrel); 3232 /* h->dynindx may be -1 if this symbol was marked to 3233 become local. */ 3234 else if (h != NULL 3235 && ((! info->symbolic && h->dynindx != -1) 3236 || (h->elf_link_hash_flags 3237 & ELF_LINK_HASH_DEF_REGULAR) == 0)) 3238 { 3239 BFD_ASSERT (h->dynindx != -1); 3240 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 3241 outrel.r_addend = rel->r_addend; 3242 } 3243 else 3244 { 3245 if (r_type == R_PPC_ADDR32) 3246 { 3247 outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE); 3248 outrel.r_addend = relocation + rel->r_addend; 3249 } 3250 else 3251 { 3252 long indx; 3253 3254 if (h == NULL) 3255 sec = local_sections[r_symndx]; 3256 else 3257 { 3258 BFD_ASSERT (h->root.type == bfd_link_hash_defined 3259 || (h->root.type 3260 == bfd_link_hash_defweak)); 3261 sec = h->root.u.def.section; 3262 } 3263 if (sec != NULL && bfd_is_abs_section (sec)) 3264 indx = 0; 3265 else if (sec == NULL || sec->owner == NULL) 3266 { 3267 bfd_set_error (bfd_error_bad_value); 3268 return false; 3269 } 3270 else 3271 { 3272 asection *osec; 3273 3274 osec = sec->output_section; 3275 indx = elf_section_data (osec)->dynindx; 3276 BFD_ASSERT(indx > 0); 3277#ifdef DEBUG 3278 if (indx <= 0) 3279 { 3280 printf("indx=%d section=%s flags=%08x name=%s\n", 3281 indx, osec->name, osec->flags, 3282 h->root.root.string); 3283 } 3284#endif 3285 } 3286 3287 outrel.r_info = ELF32_R_INFO (indx, r_type); 3288 outrel.r_addend = relocation + rel->r_addend; 3289 } 3290 } 3291 3292 bfd_elf32_swap_reloca_out (output_bfd, &outrel, 3293 (((Elf32_External_Rela *) 3294 sreloc->contents) 3295 + sreloc->reloc_count)); 3296 ++sreloc->reloc_count; 3297 3298 /* This reloc will be computed at runtime, so there's no 3299 need to do anything now, unless this is a RELATIVE 3300 reloc in an unallocated section. */ 3301 if (skip 3302 || (input_section->flags & SEC_ALLOC) != 0 3303 || ELF32_R_TYPE (outrel.r_info) != R_PPC_RELATIVE) 3304 continue; 3305 } 3306 3307 /* Arithmetic adjust relocations that aren't going into a 3308 shared object. */ 3309 if (r_type == R_PPC_ADDR16_HA 3310 /* It's just possible that this symbol is a weak symbol 3311 that's not actually defined anywhere. In that case, 3312 'sec' would be NULL, and we should leave the symbol 3313 alone (it will be set to zero elsewhere in the link). */ 3314 && sec != NULL) 3315 { 3316 addend += ((relocation + addend) & 0x8000) << 1; 3317 } 3318 break; 3319 3320 /* branch taken prediction relocations */ 3321 case (int)R_PPC_ADDR14_BRTAKEN: 3322 case (int)R_PPC_REL14_BRTAKEN: 3323 insn = bfd_get_32 (output_bfd, contents + offset); 3324 if ((relocation - offset) & 0x8000) 3325 insn &= ~BRANCH_PREDICT_BIT; 3326 else 3327 insn |= BRANCH_PREDICT_BIT; 3328 bfd_put_32 (output_bfd, insn, contents + offset); 3329 break; 3330 3331 /* branch not taken predicition relocations */ 3332 case (int)R_PPC_ADDR14_BRNTAKEN: 3333 case (int)R_PPC_REL14_BRNTAKEN: 3334 insn = bfd_get_32 (output_bfd, contents + offset); 3335 if ((relocation - offset) & 0x8000) 3336 insn |= BRANCH_PREDICT_BIT; 3337 else 3338 insn &= ~BRANCH_PREDICT_BIT; 3339 bfd_put_32 (output_bfd, insn, contents + offset); 3340 break; 3341 3342 /* GOT16 relocations */ 3343 case (int)R_PPC_GOT16: 3344 case (int)R_PPC_GOT16_LO: 3345 case (int)R_PPC_GOT16_HI: 3346 case (int)R_PPC_GOT16_HA: 3347 /* Relocation is to the entry for this symbol in the global 3348 offset table. */ 3349 BFD_ASSERT (sgot != NULL); 3350 3351 if (h != NULL) 3352 { 3353 bfd_vma off; 3354 3355 off = h->got.offset; 3356 BFD_ASSERT (off != (bfd_vma) -1); 3357 3358 if (! elf_hash_table (info)->dynamic_sections_created 3359 || (info->shared 3360 && (info->symbolic || h->dynindx == -1) 3361 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) 3362 { 3363 /* This is actually a static link, or it is a 3364 -Bsymbolic link and the symbol is defined 3365 locally. We must initialize this entry in the 3366 global offset table. Since the offset must 3367 always be a multiple of 4, we use the least 3368 significant bit to record whether we have 3369 initialized it already. 3370 3371 When doing a dynamic link, we create a .rela.got 3372 relocation entry to initialize the value. This 3373 is done in the finish_dynamic_symbol routine. */ 3374 if ((off & 1) != 0) 3375 off &= ~1; 3376 else 3377 { 3378 bfd_put_32 (output_bfd, relocation, 3379 sgot->contents + off); 3380 h->got.offset |= 1; 3381 } 3382 } 3383 3384 relocation = sgot->output_offset + off - 4; 3385 } 3386 else 3387 { 3388 bfd_vma off; 3389 3390 BFD_ASSERT (local_got_offsets != NULL 3391 && local_got_offsets[r_symndx] != (bfd_vma) -1); 3392 3393 off = local_got_offsets[r_symndx]; 3394 3395 /* The offset must always be a multiple of 4. We use 3396 the least significant bit to record whether we have 3397 already processed this entry. */ 3398 if ((off & 1) != 0) 3399 off &= ~1; 3400 else 3401 { 3402 bfd_put_32 (output_bfd, relocation, sgot->contents + off); 3403 3404 if (info->shared) 3405 { 3406 asection *srelgot; 3407 Elf_Internal_Rela outrel; 3408 3409 /* We need to generate a R_PPC_RELATIVE reloc 3410 for the dynamic linker. */ 3411 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 3412 BFD_ASSERT (srelgot != NULL); 3413 3414 outrel.r_offset = (sgot->output_section->vma 3415 + sgot->output_offset 3416 + off); 3417 outrel.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE); 3418 outrel.r_addend = relocation; 3419 bfd_elf32_swap_reloca_out (output_bfd, &outrel, 3420 (((Elf32_External_Rela *) 3421 srelgot->contents) 3422 + srelgot->reloc_count)); 3423 ++srelgot->reloc_count; 3424 } 3425 3426 local_got_offsets[r_symndx] |= 1; 3427 } 3428 3429 relocation = sgot->output_offset + off - 4; 3430 } 3431 break; 3432 3433 /* Indirect .sdata relocation */ 3434 case (int)R_PPC_EMB_SDAI16: 3435 BFD_ASSERT (sdata != NULL); 3436 relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info, 3437 sdata, h, relocation, rel, 3438 R_PPC_RELATIVE); 3439 break; 3440 3441 /* Indirect .sdata2 relocation */ 3442 case (int)R_PPC_EMB_SDA2I16: 3443 BFD_ASSERT (sdata2 != NULL); 3444 relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info, 3445 sdata2, h, relocation, rel, 3446 R_PPC_RELATIVE); 3447 break; 3448 3449 /* Handle the TOC16 reloc. We want to use the offset within the .got 3450 section, not the actual VMA. This is appropriate when generating 3451 an embedded ELF object, for which the .got section acts like the 3452 AIX .toc section. */ 3453 case (int)R_PPC_TOC16: /* phony GOT16 relocations */ 3454 BFD_ASSERT (sec != (asection *)0); 3455 BFD_ASSERT (bfd_is_und_section (sec) 3456 || strcmp (bfd_get_section_name (abfd, sec), ".got") == 0 3457 || strcmp (bfd_get_section_name (abfd, sec), ".cgot") == 0) 3458 3459 addend -= sec->output_section->vma + sec->output_offset + 0x8000; 3460 break; 3461 3462 case (int)R_PPC_PLTREL24: 3463 /* Relocation is to the entry for this symbol in the 3464 procedure linkage table. */ 3465 BFD_ASSERT (h != NULL); 3466 3467 if (h->plt.offset == (bfd_vma) -1 3468 || splt == NULL) 3469 { 3470 /* We didn't make a PLT entry for this symbol. This 3471 happens when statically linking PIC code, or when 3472 using -Bsymbolic. */ 3473 break; 3474 } 3475 3476 relocation = (splt->output_section->vma 3477 + splt->output_offset 3478 + h->plt.offset); 3479 break; 3480 3481 /* relocate against _SDA_BASE_ */ 3482 case (int)R_PPC_SDAREL16: 3483 { 3484 const char *name; 3485 3486 BFD_ASSERT (sec != (asection *)0); 3487 name = bfd_get_section_name (abfd, sec->output_section); 3488 if (strcmp (name, ".sdata") != 0 3489 && strcmp (name, ".sbss") != 0) 3490 { 3491 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"), 3492 bfd_get_filename (input_bfd), 3493 sym_name, 3494 ppc_elf_howto_table[ (int)r_type ]->name, 3495 name); 3496 } 3497 addend -= (sdata->sym_hash->root.u.def.value 3498 + sdata->sym_hash->root.u.def.section->output_section->vma 3499 + sdata->sym_hash->root.u.def.section->output_offset); 3500 } 3501 break; 3502 3503 3504 /* relocate against _SDA2_BASE_ */ 3505 case (int)R_PPC_EMB_SDA2REL: 3506 { 3507 const char *name; 3508 3509 BFD_ASSERT (sec != (asection *)0); 3510 name = bfd_get_section_name (abfd, sec->output_section); 3511 if (strcmp (name, ".sdata2") != 0 && strcmp (name, ".sbss2") != 0) 3512 { 3513 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"), 3514 bfd_get_filename (input_bfd), 3515 sym_name, 3516 ppc_elf_howto_table[ (int)r_type ]->name, 3517 name); 3518 3519 bfd_set_error (bfd_error_bad_value); 3520 ret = false; 3521 continue; 3522 } 3523 addend -= (sdata2->sym_hash->root.u.def.value 3524 + sdata2->sym_hash->root.u.def.section->output_section->vma 3525 + sdata2->sym_hash->root.u.def.section->output_offset); 3526 } 3527 break; 3528 3529 3530 /* relocate against either _SDA_BASE_, _SDA2_BASE_, or 0 */ 3531 case (int)R_PPC_EMB_SDA21: 3532 case (int)R_PPC_EMB_RELSDA: 3533 { 3534 const char *name; 3535 int reg; 3536 3537 BFD_ASSERT (sec != (asection *)0); 3538 name = bfd_get_section_name (abfd, sec->output_section); 3539 if (strcmp (name, ".sdata") == 0 || strcmp (name, ".sbss") == 0) 3540 { 3541 reg = 13; 3542 addend -= (sdata->sym_hash->root.u.def.value 3543 + sdata->sym_hash->root.u.def.section->output_section->vma 3544 + sdata->sym_hash->root.u.def.section->output_offset); 3545 } 3546 3547 else if (strcmp (name, ".sdata2") == 0 || strcmp (name, ".sbss2") == 0) 3548 { 3549 reg = 2; 3550 addend -= (sdata2->sym_hash->root.u.def.value 3551 + sdata2->sym_hash->root.u.def.section->output_section->vma 3552 + sdata2->sym_hash->root.u.def.section->output_offset); 3553 } 3554 3555 else if (strcmp (name, ".PPC.EMB.sdata0") == 0 || strcmp (name, ".PPC.EMB.sbss0") == 0) 3556 { 3557 reg = 0; 3558 } 3559 3560 else 3561 { 3562 (*_bfd_error_handler) (_("%s: The target (%s) of a %s relocation is in the wrong output section (%s)"), 3563 bfd_get_filename (input_bfd), 3564 sym_name, 3565 ppc_elf_howto_table[ (int)r_type ]->name, 3566 name); 3567 3568 bfd_set_error (bfd_error_bad_value); 3569 ret = false; 3570 continue; 3571 } 3572 3573 if (r_type == R_PPC_EMB_SDA21) 3574 { /* fill in register field */ 3575 insn = bfd_get_32 (output_bfd, contents + offset); 3576 insn = (insn & ~RA_REGISTER_MASK) | (reg << RA_REGISTER_SHIFT); 3577 bfd_put_32 (output_bfd, insn, contents + offset); 3578 } 3579 } 3580 break; 3581 3582 /* Relocate against the beginning of the section */ 3583 case (int)R_PPC_SECTOFF: 3584 case (int)R_PPC_SECTOFF_LO: 3585 case (int)R_PPC_SECTOFF_HI: 3586 BFD_ASSERT (sec != (asection *)0); 3587 addend -= sec->output_section->vma; 3588 break; 3589 3590 case (int)R_PPC_SECTOFF_HA: 3591 BFD_ASSERT (sec != (asection *)0); 3592 addend -= sec->output_section->vma; 3593 addend += ((relocation + addend) & 0x8000) << 1; 3594 break; 3595 3596 /* Negative relocations */ 3597 case (int)R_PPC_EMB_NADDR32: 3598 case (int)R_PPC_EMB_NADDR16: 3599 case (int)R_PPC_EMB_NADDR16_LO: 3600 case (int)R_PPC_EMB_NADDR16_HI: 3601 addend -= 2*relocation; 3602 break; 3603 3604 case (int)R_PPC_EMB_NADDR16_HA: 3605 addend -= 2*relocation; 3606 addend += ((relocation + addend) & 0x8000) << 1; 3607 break; 3608 3609 /* NOP relocation that prevents garbage collecting linkers from omitting a 3610 reference. */ 3611 case (int)R_PPC_EMB_MRKREF: 3612 continue; 3613 3614 case (int)R_PPC_COPY: 3615 case (int)R_PPC_GLOB_DAT: 3616 case (int)R_PPC_JMP_SLOT: 3617 case (int)R_PPC_RELATIVE: 3618 case (int)R_PPC_PLT32: 3619 case (int)R_PPC_PLTREL32: 3620 case (int)R_PPC_PLT16_LO: 3621 case (int)R_PPC_PLT16_HI: 3622 case (int)R_PPC_PLT16_HA: 3623 case (int)R_PPC_EMB_RELSEC16: 3624 case (int)R_PPC_EMB_RELST_LO: 3625 case (int)R_PPC_EMB_RELST_HI: 3626 case (int)R_PPC_EMB_RELST_HA: 3627 case (int)R_PPC_EMB_BIT_FLD: 3628 (*_bfd_error_handler) (_("%s: Relocation %s is not yet supported for symbol %s."), 3629 bfd_get_filename (input_bfd), 3630 ppc_elf_howto_table[ (int)r_type ]->name, 3631 sym_name); 3632 3633 bfd_set_error (bfd_error_invalid_operation); 3634 ret = false; 3635 continue; 3636 3637 case (int)R_PPC_GNU_VTINHERIT: 3638 case (int)R_PPC_GNU_VTENTRY: 3639 /* These are no-ops in the end. */ 3640 continue; 3641 } 3642 3643 3644#ifdef DEBUG 3645 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n", 3646 howto->name, 3647 (int)r_type, 3648 sym_name, 3649 r_symndx, 3650 (long)offset, 3651 (long)addend); 3652#endif 3653 3654 r = _bfd_final_link_relocate (howto, 3655 input_bfd, 3656 input_section, 3657 contents, 3658 offset, 3659 relocation, 3660 addend); 3661 3662 if (r == bfd_reloc_ok) 3663 ; 3664 else if (r == bfd_reloc_overflow) 3665 { 3666 const char *name; 3667 3668 if (h != NULL) 3669 { 3670 if (h->root.type == bfd_link_hash_undefweak 3671 && howto->pc_relative) 3672 { 3673 /* Assume this is a call protected by other code that 3674 detect the symbol is undefined. If this is the case, 3675 we can safely ignore the overflow. If not, the 3676 program is hosed anyway, and a little warning isn't 3677 going to help. */ 3678 3679 continue; 3680 } 3681 3682 name = h->root.root.string; 3683 } 3684 else 3685 { 3686 name = bfd_elf_string_from_elf_section (input_bfd, 3687 symtab_hdr->sh_link, 3688 sym->st_name); 3689 if (name == NULL) 3690 continue; 3691 if (*name == '\0') 3692 name = bfd_section_name (input_bfd, sec); 3693 } 3694 3695 if (! (*info->callbacks->reloc_overflow)(info, 3696 name, 3697 howto->name, 3698 (bfd_vma) 0, 3699 input_bfd, 3700 input_section, 3701 offset)) 3702 return false; 3703 } 3704 else 3705 ret = false; 3706 } 3707 3708#ifdef DEBUG 3709 fprintf (stderr, "\n"); 3710#endif 3711 3712 return ret; 3713} 3714 3715 3716#define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec 3717#define TARGET_LITTLE_NAME "elf32-powerpcle" 3718#define TARGET_BIG_SYM bfd_elf32_powerpc_vec 3719#define TARGET_BIG_NAME "elf32-powerpc" 3720#define ELF_ARCH bfd_arch_powerpc 3721#define ELF_MACHINE_CODE EM_PPC 3722#define ELF_MAXPAGESIZE 0x10000 3723#define elf_info_to_howto ppc_elf_info_to_howto 3724 3725#ifdef EM_CYGNUS_POWERPC 3726#define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC 3727#endif 3728 3729#ifdef EM_PPC_OLD 3730#define ELF_MACHINE_ALT2 EM_PPC_OLD 3731#endif 3732 3733#define elf_backend_plt_not_loaded 1 3734#define elf_backend_got_symbol_offset 4 3735#define elf_backend_can_gc_sections 1 3736#define elf_backend_got_header_size 12 3737#define elf_backend_plt_header_size PLT_INITIAL_ENTRY_SIZE 3738 3739#define bfd_elf32_bfd_copy_private_bfd_data ppc_elf_copy_private_bfd_data 3740#define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data 3741#define bfd_elf32_bfd_relax_section ppc_elf_relax_section 3742#define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup 3743#define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags 3744#define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link 3745 3746#define elf_backend_gc_mark_hook ppc_elf_gc_mark_hook 3747#define elf_backend_gc_sweep_hook ppc_elf_gc_sweep_hook 3748#define elf_backend_section_from_shdr ppc_elf_section_from_shdr 3749#define elf_backend_relocate_section ppc_elf_relocate_section 3750#define elf_backend_create_dynamic_sections ppc_elf_create_dynamic_sections 3751#define elf_backend_check_relocs ppc_elf_check_relocs 3752#define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol 3753#define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook 3754#define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections 3755#define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol 3756#define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections 3757#define elf_backend_fake_sections ppc_elf_fake_sections 3758#define elf_backend_additional_program_headers ppc_elf_additional_program_headers 3759#define elf_backend_modify_segment_map ppc_elf_modify_segment_map 3760 3761#include "elf32-target.h" 3762