1/* Meta support for 32-bit ELF 2 Copyright (C) 2013-2017 Free Software Foundation, Inc. 3 Contributed by Imagination Technologies Ltd. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22#include "sysdep.h" 23#include "bfd.h" 24#include "libbfd.h" 25#include "elf-bfd.h" 26#include "elf32-metag.h" 27#include "elf/metag.h" 28 29#define GOT_ENTRY_SIZE 4 30#define ELF_DYNAMIC_INTERPRETER "/lib/ld-uClibc.so.0" 31 32/* ABI version: 33 0 - original 34 1 - with GOT offset */ 35#define METAG_ELF_ABI_VERSION 1 36 37static const unsigned int plt0_entry[] = 38 { 39 0x02000005, /* MOVT D0Re0, #HI(GOT+4) */ 40 0x02000000, /* ADD D0Re0, D0Re0, #LO(GOT+4) */ 41 0xb70001e3, /* SETL [A0StP++], D0Re0, D1Re0 */ 42 0xc600012a, /* GETD PC, [D0Re0+#4] */ 43 0xa0fffffe /* NOP */ 44 }; 45 46static const unsigned int plt0_pic_entry[] = 47 { 48 0x82900001, /* ADDT A0.2, CPC0, #0 */ 49 0x82100000, /* ADD A0.2, A0.2, #0 */ 50 0xa3100c20, /* MOV D0Re0, A0.2 */ 51 0xb70001e3, /* SETL [A0StP++], D0Re0, D1Re0 */ 52 0xc600012a, /* GETD PC, [D0Re0+#4] */ 53 }; 54 55static const unsigned int plt_entry[] = 56 { 57 0x82100005, /* MOVT A0.2, #HI(GOT+off) */ 58 0x82100000, /* ADD A0.2, A0.2, #LO(GOT+off) */ 59 0xc600806a, /* GETD PC, [A0.2] */ 60 0x03000004, /* MOV D1Re0, #LO(offset) */ 61 0xa0000000 /* B PLT0 */ 62 }; 63 64static const unsigned int plt_pic_entry[] = 65 { 66 0x82900001, /* ADDT A0.2, CPC0, #HI(GOT+off) */ 67 0x82100000, /* ADD A0.2, A0.2, #LO(GOT+off) */ 68 0xc600806a, /* GETD PC, [A0.2] */ 69 0x03000004, /* MOV D1Re0, #LO(offset) */ 70 0xa0000000 /* B PLT0 */ 71 }; 72 73/* Variable names follow a coding style. 74 Please follow this (Apps Hungarian) style: 75 76 Structure/Variable Prefix 77 elf_link_hash_table "etab" 78 elf_link_hash_entry "eh" 79 80 elf_metag_link_hash_table "htab" 81 elf_metag_link_hash_entry "hh" 82 83 bfd_link_hash_table "btab" 84 bfd_link_hash_entry "bh" 85 86 bfd_hash_table containing stubs "bstab" 87 elf_metag_stub_hash_entry "hsh" 88 89 elf_metag_dyn_reloc_entry "hdh" 90 91 Always remember to use GNU Coding Style. */ 92 93#define PLT_ENTRY_SIZE sizeof(plt_entry) 94 95static reloc_howto_type elf_metag_howto_table[] = 96{ 97 /* High order 16 bit absolute. */ 98 HOWTO (R_METAG_HIADDR16, /* type */ 99 16, /* rightshift */ 100 2, /* size (0 = byte, 1 = short, 2 = long) */ 101 16, /* bitsize */ 102 FALSE, /* pc_relative */ 103 3, /* bitpos */ 104 complain_overflow_dont, /* complain_on_overflow */ 105 bfd_elf_generic_reloc, /* special_function */ 106 "R_METAG_HIADDR16", /* name */ 107 FALSE, /* partial_inplace */ 108 0, /* src_mask */ 109 0x0007fff8, /* dst_mask */ 110 FALSE), /* pcrel_offset */ 111 112 /* Low order 16 bit absolute. */ 113 HOWTO (R_METAG_LOADDR16, /* type */ 114 0, /* rightshift */ 115 2, /* size (0 = byte, 1 = short, 2 = long) */ 116 16, /* bitsize */ 117 FALSE, /* pc_relative */ 118 3, /* bitpos */ 119 complain_overflow_dont,/* complain_on_overflow */ 120 bfd_elf_generic_reloc, /* special_function */ 121 "R_METAG_LOADDR16", /* name */ 122 FALSE, /* partial_inplace */ 123 0, /* src_mask */ 124 0x0007fff8, /* dst_mask */ 125 FALSE), /* pcrel_offset */ 126 127 /* 32 bit absolute. */ 128 HOWTO (R_METAG_ADDR32, /* type */ 129 0, /* rightshift */ 130 2, /* size (0 = byte, 1 = short, 2 = long) */ 131 32, /* bitsize */ 132 FALSE, /* pc_relative */ 133 0, /* bitpos */ 134 complain_overflow_bitfield, /* complain_on_overflow */ 135 bfd_elf_generic_reloc, /* special_function */ 136 "R_METAG_ADDR32", /* name */ 137 FALSE, /* partial_inplace */ 138 0x00000000, /* src_mask */ 139 0xffffffff, /* dst_mask */ 140 FALSE), /* pcrel_offset */ 141 142 /* No relocation. */ 143 HOWTO (R_METAG_NONE, /* type */ 144 0, /* rightshift */ 145 3, /* size (0 = byte, 1 = short, 2 = long) */ 146 0, /* bitsize */ 147 FALSE, /* pc_relative */ 148 0, /* bitpos */ 149 complain_overflow_dont, /* complain_on_overflow */ 150 bfd_elf_generic_reloc, /* special_function */ 151 "R_METAG_NONE", /* name */ 152 FALSE, /* partial_inplace */ 153 0, /* src_mask */ 154 0, /* dst_mask */ 155 FALSE), /* pcrel_offset */ 156 157 /* 19 bit pc relative */ 158 HOWTO (R_METAG_RELBRANCH, /* type */ 159 2, /* rightshift */ 160 2, /* size (0 = byte, 1 = short, 2 = long) */ 161 19, /* bitsize */ 162 TRUE, /* pc_relative */ 163 5, /* bitpos */ 164 complain_overflow_signed, /* complain_on_overflow */ 165 bfd_elf_generic_reloc, /* special_function */ 166 "R_METAG_RELBRANCH", /* name */ 167 FALSE, /* partial_inplace */ 168 0, /* src_mask */ 169 0x00ffffe0, /* dst_mask */ 170 FALSE), /* pcrel_offset */ 171 172 /* GET/SET offset */ 173 HOWTO (R_METAG_GETSETOFF, /* type */ 174 0, /* rightshift */ 175 1, /* size (0 = byte, 1 = short, 2 = long) */ 176 12, /* bitsize */ 177 FALSE, /* pc_relative */ 178 7, /* bitpos */ 179 complain_overflow_dont, /* complain_on_overflow */ 180 bfd_elf_generic_reloc, /* special_function */ 181 "R_METAG_GETSETOFF", /* name */ 182 FALSE, /* partial_inplace */ 183 0, /* src_mask */ 184 0, /* dst_mask */ 185 FALSE), /* pcrel_offset */ 186 187 EMPTY_HOWTO (6), 188 EMPTY_HOWTO (7), 189 EMPTY_HOWTO (8), 190 EMPTY_HOWTO (9), 191 EMPTY_HOWTO (10), 192 EMPTY_HOWTO (11), 193 EMPTY_HOWTO (12), 194 EMPTY_HOWTO (13), 195 EMPTY_HOWTO (14), 196 EMPTY_HOWTO (15), 197 EMPTY_HOWTO (16), 198 EMPTY_HOWTO (17), 199 EMPTY_HOWTO (18), 200 EMPTY_HOWTO (19), 201 EMPTY_HOWTO (20), 202 EMPTY_HOWTO (21), 203 EMPTY_HOWTO (22), 204 EMPTY_HOWTO (23), 205 EMPTY_HOWTO (24), 206 EMPTY_HOWTO (25), 207 EMPTY_HOWTO (26), 208 EMPTY_HOWTO (27), 209 EMPTY_HOWTO (28), 210 EMPTY_HOWTO (29), 211 212 HOWTO (R_METAG_GNU_VTINHERIT, /* type */ 213 0, /* rightshift */ 214 2, /* size (0 = byte, 1 = short, 2 = long) */ 215 0, /* bitsize */ 216 FALSE, /* pc_relative */ 217 0, /* bitpos */ 218 complain_overflow_dont, /* complain_on_overflow */ 219 NULL, /* special_function */ 220 "R_METAG_GNU_VTINHERIT", /* name */ 221 FALSE, /* partial_inplace */ 222 0, /* src_mask */ 223 0, /* dst_mask */ 224 FALSE), /* pcrel_offset */ 225 226 HOWTO (R_METAG_GNU_VTENTRY, /* type */ 227 0, /* rightshift */ 228 2, /* size (0 = byte, 1 = short, 2 = long) */ 229 0, /* bitsize */ 230 FALSE, /* pc_relative */ 231 0, /* bitpos */ 232 complain_overflow_dont, /* complain_on_overflow */ 233 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 234 "R_METAG_GNU_VTENTRY", /* name */ 235 FALSE, /* partial_inplace */ 236 0, /* src_mask */ 237 0, /* dst_mask */ 238 FALSE), /* pcrel_offset */ 239 240 /* High order 16 bit GOT offset */ 241 HOWTO (R_METAG_HI16_GOTOFF, /* type */ 242 16, /* rightshift */ 243 2, /* size (0 = byte, 1 = short, 2 = long) */ 244 16, /* bitsize */ 245 FALSE, /* pc_relative */ 246 3, /* bitpos */ 247 complain_overflow_dont, /* complain_on_overflow */ 248 bfd_elf_generic_reloc, /* special_function */ 249 "R_METAG_HI16_GOTOFF", /* name */ 250 FALSE, /* partial_inplace */ 251 0, /* src_mask */ 252 0x0007fff8, /* dst_mask */ 253 FALSE), /* pcrel_offset */ 254 255 /* Low order 16 bit GOT offset */ 256 HOWTO (R_METAG_LO16_GOTOFF, /* type */ 257 0, /* rightshift */ 258 2, /* size (0 = byte, 1 = short, 2 = long) */ 259 16, /* bitsize */ 260 FALSE, /* pc_relative */ 261 3, /* bitpos */ 262 complain_overflow_dont, /* complain_on_overflow */ 263 bfd_elf_generic_reloc, /* special_function */ 264 "R_METAG_LO16_GOTOFF", /* name */ 265 FALSE, /* partial_inplace */ 266 0, /* src_mask */ 267 0x0007fff8, /* dst_mask */ 268 FALSE), /* pcrel_offset */ 269 270 /* GET/SET GOT offset */ 271 HOWTO (R_METAG_GETSET_GOTOFF, /* type */ 272 0, /* rightshift */ 273 1, /* size (0 = byte, 1 = short, 2 = long) */ 274 12, /* bitsize */ 275 FALSE, /* pc_relative */ 276 7, /* bitpos */ 277 complain_overflow_dont, /* complain_on_overflow */ 278 bfd_elf_generic_reloc, /* special_function */ 279 "R_METAG_GETSET_GOTOFF", /* name */ 280 FALSE, /* partial_inplace */ 281 0, /* src_mask */ 282 0, /* dst_mask */ 283 FALSE), /* pcrel_offset */ 284 285 /* GET/SET GOT relative */ 286 HOWTO (R_METAG_GETSET_GOT, /* type */ 287 0, /* rightshift */ 288 1, /* size (0 = byte, 1 = short, 2 = long) */ 289 12, /* bitsize */ 290 FALSE, /* pc_relative */ 291 7, /* bitpos */ 292 complain_overflow_dont, /* complain_on_overflow */ 293 bfd_elf_generic_reloc, /* special_function */ 294 "R_METAG_GETSET_GOT", /* name */ 295 FALSE, /* partial_inplace */ 296 0, /* src_mask */ 297 0, /* dst_mask */ 298 FALSE), /* pcrel_offset */ 299 300 /* High order 16 bit GOT reference */ 301 HOWTO (R_METAG_HI16_GOTPC, /* type */ 302 16, /* rightshift */ 303 2, /* size (0 = byte, 1 = short, 2 = long) */ 304 16, /* bitsize */ 305 FALSE, /* pc_relative */ 306 3, /* bitpos */ 307 complain_overflow_dont, /* complain_on_overflow */ 308 bfd_elf_generic_reloc, /* special_function */ 309 "R_METAG_HI16_GOTPC", /* name */ 310 FALSE, /* partial_inplace */ 311 0, /* src_mask */ 312 0x0007fff8, /* dst_mask */ 313 FALSE), /* pcrel_offset */ 314 315 /* Low order 16 bit GOT reference */ 316 HOWTO (R_METAG_LO16_GOTPC, /* type */ 317 0, /* rightshift */ 318 2, /* size (0 = byte, 1 = short, 2 = long) */ 319 16, /* bitsize */ 320 FALSE, /* pc_relative */ 321 3, /* bitpos */ 322 complain_overflow_dont, /* complain_on_overflow */ 323 bfd_elf_generic_reloc, /* special_function */ 324 "R_METAG_LO16_GOTPC", /* name */ 325 FALSE, /* partial_inplace */ 326 0, /* src_mask */ 327 0x0007fff8, /* dst_mask */ 328 FALSE), /* pcrel_offset */ 329 330 /* High order 16 bit PLT */ 331 HOWTO (R_METAG_HI16_PLT, /* type */ 332 16, /* rightshift */ 333 2, /* size (0 = byte, 1 = short, 2 = long) */ 334 16, /* bitsize */ 335 FALSE, /* pc_relative */ 336 3, /* bitpos */ 337 complain_overflow_dont, /* complain_on_overflow */ 338 bfd_elf_generic_reloc, /* special_function */ 339 "R_METAG_HI16_PLT", /* name */ 340 FALSE, /* partial_inplace */ 341 0, /* src_mask */ 342 0x0007fff8, /* dst_mask */ 343 FALSE), /* pcrel_offset */ 344 345 /* Low order 16 bit PLT */ 346 HOWTO (R_METAG_LO16_PLT, /* type */ 347 0, /* rightshift */ 348 2, /* size (0 = byte, 1 = short, 2 = long) */ 349 16, /* bitsize */ 350 FALSE, /* pc_relative */ 351 3, /* bitpos */ 352 complain_overflow_dont, /* complain_on_overflow */ 353 bfd_elf_generic_reloc, /* special_function */ 354 "R_METAG_LO16_PLT", /* name */ 355 FALSE, /* partial_inplace */ 356 0, /* src_mask */ 357 0xffffffff, /* dst_mask */ 358 FALSE), /* pcrel_offset */ 359 360 HOWTO (R_METAG_RELBRANCH_PLT, /* type */ 361 2, /* rightshift */ 362 2, /* size (0 = byte, 1 = short, 2 = long) */ 363 19, /* bitsize */ 364 TRUE, /* pc_relative */ 365 5, /* bitpos */ 366 complain_overflow_signed, /* complain_on_overflow */ 367 bfd_elf_generic_reloc, /* special_function */ 368 "R_METAG_RELBRANCH_PLT", /* name */ 369 FALSE, /* partial_inplace */ 370 0, /* src_mask */ 371 0x00ffffe0, /* dst_mask */ 372 FALSE), /* pcrel_offset */ 373 374 /* Dummy relocs used by the linker internally. */ 375 HOWTO (R_METAG_GOTOFF, /* type */ 376 0, /* rightshift */ 377 2, /* size (0 = byte, 1 = short, 2 = long) */ 378 32, /* bitsize */ 379 FALSE, /* pc_relative */ 380 0, /* bitpos */ 381 complain_overflow_bitfield, /* complain_on_overflow */ 382 bfd_elf_generic_reloc, /* special_function */ 383 "R_METAG_GOTOFF", /* name */ 384 FALSE, /* partial_inplace */ 385 0xffffffff, /* src_mask */ 386 0xffffffff, /* dst_mask */ 387 FALSE), /* pcrel_offset */ 388 389 HOWTO (R_METAG_PLT, /* type */ 390 0, /* rightshift */ 391 2, /* size (0 = byte, 1 = short, 2 = long) */ 392 32, /* bitsize */ 393 FALSE, /* pc_relative */ 394 0, /* bitpos */ 395 complain_overflow_bitfield, /* complain_on_overflow */ 396 bfd_elf_generic_reloc, /* special_function */ 397 "R_METAG_GOTOFF", /* name */ 398 FALSE, /* partial_inplace */ 399 0xffffffff, /* src_mask */ 400 0xffffffff, /* dst_mask */ 401 FALSE), /* pcrel_offset */ 402 403 /* This is used only by the dynamic linker. The symbol should exist 404 both in the object being run and in some shared library. The 405 dynamic linker copies the data addressed by the symbol from the 406 shared library into the object, because the object being 407 run has to have the data at some particular address. */ 408 HOWTO (R_METAG_COPY, /* type */ 409 0, /* rightshift */ 410 2, /* size (0 = byte, 1 = short, 2 = long) */ 411 32, /* bitsize */ 412 FALSE, /* pc_relative */ 413 0, /* bitpos */ 414 complain_overflow_bitfield, /* complain_on_overflow */ 415 bfd_elf_generic_reloc, /* special_function */ 416 "R_METAG_COPY", /* name */ 417 FALSE, /* partial_inplace */ 418 0xffffffff, /* src_mask */ 419 0xffffffff, /* dst_mask */ 420 FALSE), /* pcrel_offset */ 421 422 /* Marks a procedure linkage table entry for a symbol. */ 423 HOWTO (R_METAG_JMP_SLOT, /* type */ 424 0, /* rightshift */ 425 2, /* size (0 = byte, 1 = short, 2 = long) */ 426 32, /* bitsize */ 427 FALSE, /* pc_relative */ 428 0, /* bitpos */ 429 complain_overflow_bitfield, /* complain_on_overflow */ 430 bfd_elf_generic_reloc, /* special_function */ 431 "R_METAG_JMP_SLOT", /* name */ 432 FALSE, /* partial_inplace */ 433 0xffffffff, /* src_mask */ 434 0xffffffff, /* dst_mask */ 435 FALSE), /* pcrel_offset */ 436 437 /* Used only by the dynamic linker. When the object is run, this 438 longword is set to the load address of the object, plus the 439 addend. */ 440 HOWTO (R_METAG_RELATIVE, /* type */ 441 0, /* rightshift */ 442 2, /* size (0 = byte, 1 = short, 2 = long) */ 443 32, /* bitsize */ 444 FALSE, /* pc_relative */ 445 0, /* bitpos */ 446 complain_overflow_bitfield, /* complain_on_overflow */ 447 bfd_elf_generic_reloc, /* special_function */ 448 "R_METAG_RELATIVE", /* name */ 449 FALSE, /* partial_inplace */ 450 0xffffffff, /* src_mask */ 451 0xffffffff, /* dst_mask */ 452 FALSE), /* pcrel_offset */ 453 454 HOWTO (R_METAG_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_METAG_GLOB_DAT", /* name */ 463 FALSE, /* partial_inplace */ 464 0xffffffff, /* src_mask */ 465 0xffffffff, /* dst_mask */ 466 FALSE), /* pcrel_offset */ 467 468 HOWTO (R_METAG_TLS_GD, /* type */ 469 0, /* rightshift */ 470 2, /* size (0 = byte, 1 = short, 2 = long) */ 471 16, /* bitsize */ 472 FALSE, /* pc_relative */ 473 3, /* bitpos */ 474 complain_overflow_dont, /* complain_on_overflow */ 475 bfd_elf_generic_reloc, /* special_function */ 476 "R_METAG_TLS_GD", /* name */ 477 FALSE, /* partial_inplace */ 478 0, /* src_mask */ 479 0x0007fff8, /* dst_mask */ 480 FALSE), /* pcrel_offset */ 481 482 HOWTO (R_METAG_TLS_LDM, /* type */ 483 0, /* rightshift */ 484 2, /* size (0 = byte, 1 = short, 2 = long) */ 485 16, /* bitsize */ 486 FALSE, /* pc_relative */ 487 3, /* bitpos */ 488 complain_overflow_bitfield, /* complain_on_overflow */ 489 bfd_elf_generic_reloc, /* special_function */ 490 "R_METAG_TLS_LDM", /* name */ 491 FALSE, /* partial_inplace */ 492 0, /* src_mask */ 493 0x0007fff8, /* dst_mask */ 494 FALSE), /* pcrel_offset */ 495 496 HOWTO (R_METAG_TLS_LDO_HI16, /* type */ 497 16, /* rightshift */ 498 2, /* size (0 = byte, 1 = short, 2 = long) */ 499 16, /* bitsize */ 500 FALSE, /* pc_relative */ 501 3, /* bitpos */ 502 complain_overflow_bitfield, /* complain_on_overflow */ 503 bfd_elf_generic_reloc, /* special_function */ 504 "R_METAG_TLS_LDO_HI16", /* name */ 505 FALSE, /* partial_inplace */ 506 0, /* src_mask */ 507 0x0007fff8, /* dst_mask */ 508 FALSE), /* pcrel_offset */ 509 510 HOWTO (R_METAG_TLS_LDO_LO16, /* type */ 511 0, /* rightshift */ 512 2, /* size (0 = byte, 1 = short, 2 = long) */ 513 16, /* bitsize */ 514 FALSE, /* pc_relative */ 515 3, /* bitpos */ 516 complain_overflow_bitfield, /* complain_on_overflow */ 517 bfd_elf_generic_reloc, /* special_function */ 518 "R_METAG_TLS_LDO_LO16", /* name */ 519 FALSE, /* partial_inplace */ 520 0, /* src_mask */ 521 0x0007fff8, /* dst_mask */ 522 FALSE), /* pcrel_offset */ 523 524 /* Dummy reloc used by the linker internally. */ 525 HOWTO (R_METAG_TLS_LDO, /* type */ 526 0, /* rightshift */ 527 2, /* size (0 = byte, 1 = short, 2 = long) */ 528 16, /* bitsize */ 529 FALSE, /* pc_relative */ 530 3, /* bitpos */ 531 complain_overflow_bitfield, /* complain_on_overflow */ 532 bfd_elf_generic_reloc, /* special_function */ 533 "R_METAG_TLS_LDO", /* name */ 534 FALSE, /* partial_inplace */ 535 0, /* src_mask */ 536 0x0007fff8, /* dst_mask */ 537 FALSE), /* pcrel_offset */ 538 539 HOWTO (R_METAG_TLS_IE, /* type */ 540 2, /* rightshift */ 541 2, /* size (0 = byte, 1 = short, 2 = long) */ 542 12, /* bitsize */ 543 FALSE, /* pc_relative */ 544 7, /* bitpos */ 545 complain_overflow_dont, /* complain_on_overflow */ 546 bfd_elf_generic_reloc, /* special_function */ 547 "R_METAG_TLS_IE", /* name */ 548 FALSE, /* partial_inplace */ 549 0, /* src_mask */ 550 0x0007ff80, /* dst_mask */ 551 FALSE), /* pcrel_offset */ 552 553 /* Dummy reloc used by the linker internally. */ 554 HOWTO (R_METAG_TLS_IENONPIC, /* type */ 555 0, /* rightshift */ 556 2, /* size (0 = byte, 1 = short, 2 = long) */ 557 16, /* bitsize */ 558 FALSE, /* pc_relative */ 559 3, /* bitpos */ 560 complain_overflow_dont, /* complain_on_overflow */ 561 bfd_elf_generic_reloc, /* special_function */ 562 "R_METAG_TLS_IENONPIC", /* name */ 563 FALSE, /* partial_inplace */ 564 0, /* src_mask */ 565 0x0007fff8, /* dst_mask */ 566 FALSE), /* pcrel_offset */ 567 568 HOWTO (R_METAG_TLS_IENONPIC_HI16,/* type */ 569 16, /* rightshift */ 570 2, /* size (0 = byte, 1 = short, 2 = long) */ 571 16, /* bitsize */ 572 FALSE, /* pc_relative */ 573 3, /* bitpos */ 574 complain_overflow_dont, /* complain_on_overflow */ 575 bfd_elf_generic_reloc, /* special_function */ 576 "R_METAG_TLS_IENONPIC_HI16", /* name */ 577 FALSE, /* partial_inplace */ 578 0, /* src_mask */ 579 0x0007fff8, /* dst_mask */ 580 FALSE), /* pcrel_offset */ 581 582 HOWTO (R_METAG_TLS_IENONPIC_LO16,/* type */ 583 0, /* rightshift */ 584 2, /* size (0 = byte, 1 = short, 2 = long) */ 585 16, /* bitsize */ 586 FALSE, /* pc_relative */ 587 3, /* bitpos */ 588 complain_overflow_dont, /* complain_on_overflow */ 589 bfd_elf_generic_reloc, /* special_function */ 590 "R_METAG_TLS_IENONPIC_LO16", /* name */ 591 FALSE, /* partial_inplace */ 592 0, /* src_mask */ 593 0x0007fff8, /* dst_mask */ 594 FALSE), /* pcrel_offset */ 595 596 HOWTO (R_METAG_TLS_TPOFF, /* type */ 597 0, /* rightshift */ 598 2, /* size (0 = byte, 1 = short, 2 = long) */ 599 32, /* bitsize */ 600 FALSE, /* pc_relative */ 601 0, /* bitpos */ 602 complain_overflow_bitfield, /* complain_on_overflow */ 603 bfd_elf_generic_reloc, /* special_function */ 604 "R_METAG_TLS_TPOFF", /* name */ 605 FALSE, /* partial_inplace */ 606 0, /* src_mask */ 607 0xffffffff, /* dst_mask */ 608 FALSE), /* pcrel_offset */ 609 610 HOWTO (R_METAG_TLS_DTPMOD, /* type */ 611 0, /* rightshift */ 612 2, /* size (0 = byte, 1 = short, 2 = long) */ 613 32, /* bitsize */ 614 FALSE, /* pc_relative */ 615 0, /* bitpos */ 616 complain_overflow_bitfield, /* complain_on_overflow */ 617 bfd_elf_generic_reloc, /* special_function */ 618 "R_METAG_TLS_DTPMOD", /* name */ 619 FALSE, /* partial_inplace */ 620 0, /* src_mask */ 621 0xffffffff, /* dst_mask */ 622 FALSE), /* pcrel_offset */ 623 624 HOWTO (R_METAG_TLS_DTPOFF, /* type */ 625 0, /* rightshift */ 626 2, /* size (0 = byte, 1 = short, 2 = long) */ 627 32, /* bitsize */ 628 FALSE, /* pc_relative */ 629 0, /* bitpos */ 630 complain_overflow_bitfield, /* complain_on_overflow */ 631 bfd_elf_generic_reloc, /* special_function */ 632 "R_METAG_TLS_DTPOFF", /* name */ 633 FALSE, /* partial_inplace */ 634 0, /* src_mask */ 635 0xffffffff, /* dst_mask */ 636 FALSE), /* pcrel_offset */ 637 638 /* Dummy reloc used by the linker internally. */ 639 HOWTO (R_METAG_TLS_LE, /* type */ 640 0, /* rightshift */ 641 2, /* size (0 = byte, 1 = short, 2 = long) */ 642 32, /* bitsize */ 643 FALSE, /* pc_relative */ 644 0, /* bitpos */ 645 complain_overflow_bitfield, /* complain_on_overflow */ 646 bfd_elf_generic_reloc, /* special_function */ 647 "R_METAG_TLS_LE", /* name */ 648 FALSE, /* partial_inplace */ 649 0, /* src_mask */ 650 0xffffffff, /* dst_mask */ 651 FALSE), /* pcrel_offset */ 652 653 HOWTO (R_METAG_TLS_LE_HI16, /* type */ 654 16, /* rightshift */ 655 2, /* size (0 = byte, 1 = short, 2 = long) */ 656 16, /* bitsize */ 657 FALSE, /* pc_relative */ 658 3, /* bitpos */ 659 complain_overflow_dont, /* complain_on_overflow */ 660 bfd_elf_generic_reloc, /* special_function */ 661 "R_METAG_TLS_LE_HI16", /* name */ 662 FALSE, /* partial_inplace */ 663 0, /* src_mask */ 664 0x0007fff8, /* dst_mask */ 665 FALSE), /* pcrel_offset */ 666 667 HOWTO (R_METAG_TLS_LE_LO16, /* type */ 668 0, /* rightshift */ 669 2, /* size (0 = byte, 1 = short, 2 = long) */ 670 16, /* bitsize */ 671 FALSE, /* pc_relative */ 672 3, /* bitpos */ 673 complain_overflow_dont, /* complain_on_overflow */ 674 bfd_elf_generic_reloc, /* special_function */ 675 "R_METAG_TLS_LE_LO16", /* name */ 676 FALSE, /* partial_inplace */ 677 0, /* src_mask */ 678 0x0007fff8, /* dst_mask */ 679 FALSE), /* pcrel_offset */ 680 681}; 682 683#define BRANCH_BITS 19 684 685/* The GOT is typically accessed using a [GS]ETD instruction. The size of the 686 immediate offset which can be used in such instructions therefore limits 687 the usable size of the GOT. If the base register for the [GS]ETD (A1LbP) 688 is pointing to the base of the GOT then the size is limited to the maximum 689 11 bits unsigned dword offset, or 2^13 = 0x2000 bytes. However the offset 690 in a [GS]ETD instruction is signed, so by setting the base address register 691 to an offset of that 0x2000 byte maximum unsigned offset from the base of 692 the GOT we can use negative offsets in addition to positive. This 693 effectively doubles the usable GOT size to 0x4000 bytes. */ 694#define GOT_REG_OFFSET 0x2000 695 696struct metag_reloc_map 697{ 698 bfd_reloc_code_real_type bfd_reloc_val; 699 unsigned int metag_reloc_val; 700}; 701 702static const struct metag_reloc_map metag_reloc_map [] = 703 { 704 { BFD_RELOC_NONE, R_METAG_NONE }, 705 { BFD_RELOC_32, R_METAG_ADDR32 }, 706 { BFD_RELOC_METAG_HIADDR16, R_METAG_HIADDR16 }, 707 { BFD_RELOC_METAG_LOADDR16, R_METAG_LOADDR16 }, 708 { BFD_RELOC_METAG_RELBRANCH, R_METAG_RELBRANCH }, 709 { BFD_RELOC_METAG_GETSETOFF, R_METAG_GETSETOFF }, 710 { BFD_RELOC_VTABLE_INHERIT, R_METAG_GNU_VTINHERIT }, 711 { BFD_RELOC_VTABLE_ENTRY, R_METAG_GNU_VTENTRY }, 712 { BFD_RELOC_METAG_REL8, R_METAG_REL8 }, 713 { BFD_RELOC_METAG_REL16, R_METAG_REL16 }, 714 { BFD_RELOC_METAG_HI16_GOTOFF, R_METAG_HI16_GOTOFF }, 715 { BFD_RELOC_METAG_LO16_GOTOFF, R_METAG_LO16_GOTOFF }, 716 { BFD_RELOC_METAG_GETSET_GOTOFF, R_METAG_GETSET_GOTOFF }, 717 { BFD_RELOC_METAG_GETSET_GOT, R_METAG_GETSET_GOT }, 718 { BFD_RELOC_METAG_HI16_GOTPC, R_METAG_HI16_GOTPC }, 719 { BFD_RELOC_METAG_LO16_GOTPC, R_METAG_LO16_GOTPC }, 720 { BFD_RELOC_METAG_HI16_PLT, R_METAG_HI16_PLT }, 721 { BFD_RELOC_METAG_LO16_PLT, R_METAG_LO16_PLT }, 722 { BFD_RELOC_METAG_RELBRANCH_PLT, R_METAG_RELBRANCH_PLT }, 723 { BFD_RELOC_METAG_GOTOFF, R_METAG_GOTOFF }, 724 { BFD_RELOC_METAG_PLT, R_METAG_PLT }, 725 { BFD_RELOC_METAG_COPY, R_METAG_COPY }, 726 { BFD_RELOC_METAG_JMP_SLOT, R_METAG_JMP_SLOT }, 727 { BFD_RELOC_METAG_RELATIVE, R_METAG_RELATIVE }, 728 { BFD_RELOC_METAG_GLOB_DAT, R_METAG_GLOB_DAT }, 729 { BFD_RELOC_METAG_TLS_GD, R_METAG_TLS_GD }, 730 { BFD_RELOC_METAG_TLS_LDM, R_METAG_TLS_LDM }, 731 { BFD_RELOC_METAG_TLS_LDO_HI16, R_METAG_TLS_LDO_HI16 }, 732 { BFD_RELOC_METAG_TLS_LDO_LO16, R_METAG_TLS_LDO_LO16 }, 733 { BFD_RELOC_METAG_TLS_LDO, R_METAG_TLS_LDO }, 734 { BFD_RELOC_METAG_TLS_IE, R_METAG_TLS_IE }, 735 { BFD_RELOC_METAG_TLS_IENONPIC, R_METAG_TLS_IENONPIC }, 736 { BFD_RELOC_METAG_TLS_IENONPIC_HI16, R_METAG_TLS_IENONPIC_HI16 }, 737 { BFD_RELOC_METAG_TLS_IENONPIC_LO16, R_METAG_TLS_IENONPIC_LO16 }, 738 { BFD_RELOC_METAG_TLS_TPOFF, R_METAG_TLS_TPOFF }, 739 { BFD_RELOC_METAG_TLS_DTPMOD, R_METAG_TLS_DTPMOD }, 740 { BFD_RELOC_METAG_TLS_DTPOFF, R_METAG_TLS_DTPOFF }, 741 { BFD_RELOC_METAG_TLS_LE, R_METAG_TLS_LE }, 742 { BFD_RELOC_METAG_TLS_LE_HI16, R_METAG_TLS_LE_HI16 }, 743 { BFD_RELOC_METAG_TLS_LE_LO16, R_METAG_TLS_LE_LO16 }, 744 }; 745 746enum elf_metag_stub_type 747{ 748 metag_stub_long_branch, 749 metag_stub_long_branch_shared, 750 metag_stub_none 751}; 752 753struct elf_metag_stub_hash_entry 754{ 755 /* Base hash table entry structure. */ 756 struct bfd_hash_entry bh_root; 757 758 /* The stub section. */ 759 asection *stub_sec; 760 761 /* Offset within stub_sec of the beginning of this stub. */ 762 bfd_vma stub_offset; 763 764 /* Given the symbol's value and its section we can determine its final 765 value when building the stubs (so the stub knows where to jump. */ 766 bfd_vma target_value; 767 asection *target_section; 768 769 enum elf_metag_stub_type stub_type; 770 771 /* The symbol table entry, if any, that this was derived from. */ 772 struct elf_metag_link_hash_entry *hh; 773 774 /* And the reloc addend that this was derived from. */ 775 bfd_vma addend; 776 777 /* Where this stub is being called from, or, in the case of combined 778 stub sections, the first input section in the group. */ 779 asection *id_sec; 780}; 781 782struct elf_metag_link_hash_entry 783{ 784 struct elf_link_hash_entry eh; 785 786 /* A pointer to the most recently used stub hash entry against this 787 symbol. */ 788 struct elf_metag_stub_hash_entry *hsh_cache; 789 790 /* Used to count relocations for delayed sizing of relocation 791 sections. */ 792 struct elf_metag_dyn_reloc_entry { 793 794 /* Next relocation in the chain. */ 795 struct elf_metag_dyn_reloc_entry *hdh_next; 796 797 /* The input section of the reloc. */ 798 asection *sec; 799 800 /* Number of relocs copied in this section. */ 801 bfd_size_type count; 802 803 /* Number of relative relocs copied for the input section. */ 804 bfd_size_type relative_count; 805 } *dyn_relocs; 806 807 enum 808 { 809 GOT_UNKNOWN = 0, GOT_NORMAL = 1, GOT_TLS_IE = 2, GOT_TLS_LDM = 4, GOT_TLS_GD = 8 810 } tls_type; 811}; 812 813struct elf_metag_link_hash_table 814{ 815 /* The main hash table. */ 816 struct elf_link_hash_table etab; 817 818 /* The stub hash table. */ 819 struct bfd_hash_table bstab; 820 821 /* Linker stub bfd. */ 822 bfd *stub_bfd; 823 824 /* Linker call-backs. */ 825 asection * (*add_stub_section) (const char *, asection *); 826 void (*layout_sections_again) (void); 827 828 /* Array to keep track of which stub sections have been created, and 829 information on stub grouping. */ 830 struct map_stub 831 { 832 /* This is the section to which stubs in the group will be 833 attached. */ 834 asection *link_sec; 835 /* The stub section. */ 836 asection *stub_sec; 837 } *stub_group; 838 839 /* Assorted information used by elf_metag_size_stubs. */ 840 unsigned int bfd_count; 841 unsigned int top_index; 842 asection **input_list; 843 Elf_Internal_Sym **all_local_syms; 844 845 /* Small local sym cache. */ 846 struct sym_cache sym_cache; 847 848 /* Data for LDM relocations. */ 849 union 850 { 851 bfd_signed_vma refcount; 852 bfd_vma offset; 853 } tls_ldm_got; 854}; 855 856/* Return the base vma address which should be subtracted from the 857 real address when resolving a dtpoff relocation. This is PT_TLS 858 segment p_vaddr. */ 859static bfd_vma 860dtpoff_base (struct bfd_link_info *info) 861{ 862 /* If tls_sec is NULL, we should have signalled an error already. */ 863 if (elf_hash_table (info)->tls_sec == NULL) 864 return 0; 865 return elf_hash_table (info)->tls_sec->vma; 866} 867 868/* Return the relocation value for R_METAG_TLS_IE */ 869static bfd_vma 870tpoff (struct bfd_link_info *info, bfd_vma address) 871{ 872 /* If tls_sec is NULL, we should have signalled an error already. */ 873 if (elf_hash_table (info)->tls_sec == NULL) 874 return 0; 875 /* METAG TLS ABI is variant I and static TLS blocks start just after 876 tcbhead structure which has 2 pointer fields. */ 877 return (address - elf_hash_table (info)->tls_sec->vma 878 + align_power ((bfd_vma) 8, 879 elf_hash_table (info)->tls_sec->alignment_power)); 880} 881 882static void 883metag_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, 884 arelent *cache_ptr, 885 Elf_Internal_Rela *dst) 886{ 887 unsigned int r_type; 888 889 r_type = ELF32_R_TYPE (dst->r_info); 890 if (r_type >= (unsigned int) R_METAG_MAX) 891 { 892 /* xgettext:c-format */ 893 _bfd_error_handler (_("%B: invalid METAG reloc number: %d"), abfd, r_type); 894 r_type = 0; 895 } 896 cache_ptr->howto = & elf_metag_howto_table [r_type]; 897} 898 899static reloc_howto_type * 900metag_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, 901 bfd_reloc_code_real_type code) 902{ 903 unsigned int i; 904 905 for (i = 0; i < sizeof (metag_reloc_map) / sizeof (metag_reloc_map[0]); i++) 906 if (metag_reloc_map [i].bfd_reloc_val == code) 907 return & elf_metag_howto_table [metag_reloc_map[i].metag_reloc_val]; 908 909 return NULL; 910} 911 912static reloc_howto_type * 913metag_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 914 const char *r_name) 915{ 916 unsigned int i; 917 918 for (i = 0; i < sizeof (elf_metag_howto_table) / sizeof (elf_metag_howto_table[0]); i++) 919 if (elf_metag_howto_table[i].name != NULL 920 && strcasecmp (elf_metag_howto_table[i].name, r_name) == 0) 921 return &elf_metag_howto_table[i]; 922 923 return NULL; 924} 925 926/* Various hash macros and functions. */ 927#define metag_link_hash_table(p) \ 928 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 929 == METAG_ELF_DATA ? ((struct elf_metag_link_hash_table *) ((p)->hash)) : NULL) 930 931#define metag_elf_hash_entry(ent) \ 932 ((struct elf_metag_link_hash_entry *)(ent)) 933 934#define metag_stub_hash_entry(ent) \ 935 ((struct elf_metag_stub_hash_entry *)(ent)) 936 937#define metag_stub_hash_lookup(table, string, create, copy) \ 938 ((struct elf_metag_stub_hash_entry *) \ 939 bfd_hash_lookup ((table), (string), (create), (copy))) 940 941#define metag_elf_local_got_tls_type(abfd) \ 942 ((char *)(elf_local_got_offsets (abfd) + (elf_tdata (abfd)->symtab_hdr.sh_info))) 943 944/* Assorted hash table functions. */ 945 946/* Initialize an entry in the stub hash table. */ 947 948static struct bfd_hash_entry * 949stub_hash_newfunc (struct bfd_hash_entry *entry, 950 struct bfd_hash_table *table, 951 const char *string) 952{ 953 /* Allocate the structure if it has not already been allocated by a 954 subclass. */ 955 if (entry == NULL) 956 { 957 entry = bfd_hash_allocate (table, 958 sizeof (struct elf_metag_stub_hash_entry)); 959 if (entry == NULL) 960 return entry; 961 } 962 963 /* Call the allocation method of the superclass. */ 964 entry = bfd_hash_newfunc (entry, table, string); 965 if (entry != NULL) 966 { 967 struct elf_metag_stub_hash_entry *hsh; 968 969 /* Initialize the local fields. */ 970 hsh = (struct elf_metag_stub_hash_entry *) entry; 971 hsh->stub_sec = NULL; 972 hsh->stub_offset = 0; 973 hsh->target_value = 0; 974 hsh->target_section = NULL; 975 hsh->stub_type = metag_stub_long_branch; 976 hsh->hh = NULL; 977 hsh->id_sec = NULL; 978 } 979 980 return entry; 981} 982 983/* Initialize an entry in the link hash table. */ 984 985static struct bfd_hash_entry * 986metag_link_hash_newfunc (struct bfd_hash_entry *entry, 987 struct bfd_hash_table *table, 988 const char *string) 989{ 990 /* Allocate the structure if it has not already been allocated by a 991 subclass. */ 992 if (entry == NULL) 993 { 994 entry = bfd_hash_allocate (table, 995 sizeof (struct elf_metag_link_hash_entry)); 996 if (entry == NULL) 997 return entry; 998 } 999 1000 /* Call the allocation method of the superclass. */ 1001 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 1002 if (entry != NULL) 1003 { 1004 struct elf_metag_link_hash_entry *hh; 1005 1006 /* Initialize the local fields. */ 1007 hh = (struct elf_metag_link_hash_entry *) entry; 1008 hh->hsh_cache = NULL; 1009 hh->dyn_relocs = NULL; 1010 hh->tls_type = GOT_UNKNOWN; 1011 } 1012 1013 return entry; 1014} 1015 1016/* Free the derived linker hash table. */ 1017 1018static void 1019elf_metag_link_hash_table_free (bfd *obfd) 1020{ 1021 struct elf_metag_link_hash_table *htab 1022 = (struct elf_metag_link_hash_table *) obfd->link.hash; 1023 1024 bfd_hash_table_free (&htab->bstab); 1025 _bfd_elf_link_hash_table_free (obfd); 1026} 1027 1028/* Create the derived linker hash table. The Meta ELF port uses the derived 1029 hash table to keep information specific to the Meta ELF linker (without 1030 using static variables). */ 1031 1032static struct bfd_link_hash_table * 1033elf_metag_link_hash_table_create (bfd *abfd) 1034{ 1035 struct elf_metag_link_hash_table *htab; 1036 bfd_size_type amt = sizeof (*htab); 1037 1038 htab = bfd_zmalloc (amt); 1039 if (htab == NULL) 1040 return NULL; 1041 1042 if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd, 1043 metag_link_hash_newfunc, 1044 sizeof (struct elf_metag_link_hash_entry), 1045 METAG_ELF_DATA)) 1046 { 1047 free (htab); 1048 return NULL; 1049 } 1050 1051 /* Init the stub hash table too. */ 1052 if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc, 1053 sizeof (struct elf_metag_stub_hash_entry))) 1054 { 1055 _bfd_elf_link_hash_table_free (abfd); 1056 return NULL; 1057 } 1058 htab->etab.root.hash_table_free = elf_metag_link_hash_table_free; 1059 1060 return &htab->etab.root; 1061} 1062 1063/* Section name for stubs is the associated section name plus this 1064 string. */ 1065#define STUB_SUFFIX ".stub" 1066 1067/* Build a name for an entry in the stub hash table. */ 1068 1069static char * 1070metag_stub_name (const asection *input_section, 1071 const asection *sym_sec, 1072 const struct elf_metag_link_hash_entry *hh, 1073 const Elf_Internal_Rela *rel) 1074{ 1075 char *stub_name; 1076 bfd_size_type len; 1077 1078 if (hh) 1079 { 1080 len = 8 + 1 + strlen (hh->eh.root.root.string) + 1 + 8 + 1; 1081 stub_name = bfd_malloc (len); 1082 if (stub_name != NULL) 1083 { 1084 sprintf (stub_name, "%08x_%s+%x", 1085 input_section->id & 0xffffffff, 1086 hh->eh.root.root.string, 1087 (int) rel->r_addend & 0xffffffff); 1088 } 1089 } 1090 else 1091 { 1092 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1; 1093 stub_name = bfd_malloc (len); 1094 if (stub_name != NULL) 1095 { 1096 sprintf (stub_name, "%08x_%x:%x+%x", 1097 input_section->id & 0xffffffff, 1098 sym_sec->id & 0xffffffff, 1099 (int) ELF32_R_SYM (rel->r_info) & 0xffffffff, 1100 (int) rel->r_addend & 0xffffffff); 1101 } 1102 } 1103 return stub_name; 1104} 1105 1106/* Look up an entry in the stub hash. Stub entries are cached because 1107 creating the stub name takes a bit of time. */ 1108 1109static struct elf_metag_stub_hash_entry * 1110metag_get_stub_entry (const asection *input_section, 1111 const asection *sym_sec, 1112 struct elf_metag_link_hash_entry *hh, 1113 const Elf_Internal_Rela *rel, 1114 struct elf_metag_link_hash_table *htab) 1115{ 1116 struct elf_metag_stub_hash_entry *hsh; 1117 const asection *id_sec; 1118 1119 /* If this input section is part of a group of sections sharing one 1120 stub section, then use the id of the first section in the group. 1121 Stub names need to include a section id, as there may well be 1122 more than one stub used to reach say, printf, and we need to 1123 distinguish between them. */ 1124 id_sec = htab->stub_group[input_section->id].link_sec; 1125 1126 if (hh != NULL && hh->hsh_cache != NULL 1127 && hh->hsh_cache->hh == hh 1128 && hh->hsh_cache->id_sec == id_sec) 1129 { 1130 hsh = hh->hsh_cache; 1131 } 1132 else 1133 { 1134 char *stub_name; 1135 1136 stub_name = metag_stub_name (id_sec, sym_sec, hh, rel); 1137 if (stub_name == NULL) 1138 return NULL; 1139 1140 hsh = metag_stub_hash_lookup (&htab->bstab, 1141 stub_name, FALSE, FALSE); 1142 1143 if (hh != NULL) 1144 hh->hsh_cache = hsh; 1145 1146 free (stub_name); 1147 } 1148 1149 return hsh; 1150} 1151 1152/* Add a new stub entry to the stub hash. Not all fields of the new 1153 stub entry are initialised. */ 1154 1155static struct elf_metag_stub_hash_entry * 1156metag_add_stub (const char *stub_name, 1157 asection *section, 1158 struct elf_metag_link_hash_table *htab) 1159{ 1160 asection *link_sec; 1161 asection *stub_sec; 1162 struct elf_metag_stub_hash_entry *hsh; 1163 1164 link_sec = htab->stub_group[section->id].link_sec; 1165 stub_sec = htab->stub_group[section->id].stub_sec; 1166 if (stub_sec == NULL) 1167 { 1168 stub_sec = htab->stub_group[link_sec->id].stub_sec; 1169 if (stub_sec == NULL) 1170 { 1171 size_t namelen; 1172 bfd_size_type len; 1173 char *s_name; 1174 1175 namelen = strlen (link_sec->name); 1176 len = namelen + sizeof (STUB_SUFFIX); 1177 s_name = bfd_alloc (htab->stub_bfd, len); 1178 if (s_name == NULL) 1179 return NULL; 1180 1181 memcpy (s_name, link_sec->name, namelen); 1182 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX)); 1183 1184 stub_sec = (*htab->add_stub_section) (s_name, link_sec); 1185 if (stub_sec == NULL) 1186 return NULL; 1187 htab->stub_group[link_sec->id].stub_sec = stub_sec; 1188 } 1189 htab->stub_group[section->id].stub_sec = stub_sec; 1190 } 1191 1192 /* Enter this entry into the linker stub hash table. */ 1193 hsh = metag_stub_hash_lookup (&htab->bstab, stub_name, 1194 TRUE, FALSE); 1195 if (hsh == NULL) 1196 { 1197 /* xgettext:c-format */ 1198 _bfd_error_handler (_("%B: cannot create stub entry %s"), 1199 section->owner, stub_name); 1200 return NULL; 1201 } 1202 1203 hsh->stub_sec = stub_sec; 1204 hsh->stub_offset = 0; 1205 hsh->id_sec = link_sec; 1206 return hsh; 1207} 1208 1209/* Check a signed integer value can be represented in the given number 1210 of bits. */ 1211 1212static bfd_boolean 1213within_signed_range (int value, unsigned int bits) 1214{ 1215 int min_val = -(1 << (bits - 1)); 1216 int max_val = (1 << (bits - 1)) - 1; 1217 return (value <= max_val) && (value >= min_val); 1218} 1219 1220/* Perform a relocation as part of a final link. */ 1221 1222static bfd_reloc_status_type 1223metag_final_link_relocate (reloc_howto_type *howto, 1224 bfd *input_bfd, 1225 asection *input_section, 1226 bfd_byte *contents, 1227 Elf_Internal_Rela *rel, 1228 bfd_vma relocation, 1229 struct elf_metag_link_hash_entry *hh, 1230 struct elf_metag_link_hash_table *htab, 1231 asection *sym_sec) 1232{ 1233 bfd_reloc_status_type r = bfd_reloc_ok; 1234 bfd_byte *hit_data = contents + rel->r_offset; 1235 int opcode, op_shift, op_extended, l1, l2; 1236 bfd_signed_vma srel, addend = rel->r_addend; 1237 struct elf_metag_stub_hash_entry *hsh = NULL; 1238 bfd_vma location; 1239 1240 /* Find out where we are and where we're going. */ 1241 location = (rel->r_offset + 1242 input_section->output_offset + 1243 input_section->output_section->vma); 1244 1245 switch (howto->type) 1246 { 1247 case R_METAG_RELBRANCH: 1248 case R_METAG_RELBRANCH_PLT: 1249 /* Make it a pc relative offset. */ 1250 relocation -= location; 1251 break; 1252 case R_METAG_TLS_GD: 1253 case R_METAG_TLS_IE: 1254 relocation -= elf_gp (input_section->output_section->owner); 1255 break; 1256 default: 1257 break; 1258 } 1259 1260 switch (howto->type) 1261 { 1262 case R_METAG_RELBRANCH_PLT: 1263 case R_METAG_RELBRANCH: 1264 opcode = bfd_get_32 (input_bfd, hit_data); 1265 1266 srel = (bfd_signed_vma) relocation; 1267 srel += addend; 1268 1269 /* If the branch is out of reach, then redirect the 1270 call to the local stub for this function. */ 1271 if (srel > ((1 << (BRANCH_BITS + 1)) - 1) || 1272 (srel < - (1 << (BRANCH_BITS + 1)))) 1273 { 1274 if (sym_sec == NULL) 1275 break; 1276 1277 hsh = metag_get_stub_entry (input_section, sym_sec, 1278 hh, rel, htab); 1279 if (hsh == NULL) 1280 return bfd_reloc_undefined; 1281 1282 /* Munge up the value and addend so that we call the stub 1283 rather than the procedure directly. */ 1284 srel = (hsh->stub_offset 1285 + hsh->stub_sec->output_offset 1286 + hsh->stub_sec->output_section->vma); 1287 srel -= location; 1288 } 1289 1290 srel = srel >> 2; 1291 1292 if (!within_signed_range (srel, BRANCH_BITS)) 1293 { 1294 if (hh && hh->eh.root.type == bfd_link_hash_undefweak) 1295 srel = 0; 1296 else 1297 return bfd_reloc_overflow; 1298 } 1299 1300 opcode &= ~(0x7ffff << 5); 1301 opcode |= ((srel & 0x7ffff) << 5); 1302 1303 bfd_put_32 (input_bfd, opcode, hit_data); 1304 break; 1305 case R_METAG_GETSETOFF: 1306 case R_METAG_GETSET_GOT: 1307 case R_METAG_GETSET_GOTOFF: 1308 opcode = bfd_get_32 (input_bfd, hit_data); 1309 1310 srel = (bfd_signed_vma) relocation; 1311 srel += addend; 1312 1313 /* Is this a standard or extended GET/SET? */ 1314 if ((opcode & 0xf0000000) == 0xa0000000) 1315 { 1316 /* Extended GET/SET. */ 1317 l1 = opcode & 0x2; 1318 l2 = opcode & 0x4; 1319 op_extended = 1; 1320 } 1321 else 1322 { 1323 /* Standard GET/SET. */ 1324 l1 = opcode & 0x01000000; 1325 l2 = opcode & 0x04000000; 1326 op_extended = 0; 1327 } 1328 1329 /* Calculate the width of the GET/SET and how much we need to 1330 shift the result by. */ 1331 if (l2) 1332 if (l1) 1333 op_shift = 3; 1334 else 1335 op_shift = 2; 1336 else 1337 if (l1) 1338 op_shift = 1; 1339 else 1340 op_shift = 0; 1341 1342 /* GET/SET offsets are scaled by the width of the transfer. */ 1343 srel = srel >> op_shift; 1344 1345 /* Extended GET/SET has signed 12 bits of offset, standard has 1346 signed 6 bits. */ 1347 if (op_extended) 1348 { 1349 if (!within_signed_range (srel, 12)) 1350 { 1351 if (hh && hh->eh.root.type == bfd_link_hash_undefweak) 1352 srel = 0; 1353 else 1354 return bfd_reloc_overflow; 1355 } 1356 opcode &= ~(0xfff << 7); 1357 opcode |= ((srel & 0xfff) << 7); 1358 } 1359 else 1360 { 1361 if (!within_signed_range (srel, 5)) 1362 { 1363 if (hh && hh->eh.root.type == bfd_link_hash_undefweak) 1364 srel = 0; 1365 else 1366 return bfd_reloc_overflow; 1367 } 1368 opcode &= ~(0x3f << 8); 1369 opcode |= ((srel & 0x3f) << 8); 1370 } 1371 1372 bfd_put_32 (input_bfd, opcode, hit_data); 1373 break; 1374 case R_METAG_TLS_GD: 1375 case R_METAG_TLS_LDM: 1376 opcode = bfd_get_32 (input_bfd, hit_data); 1377 1378 if ((bfd_signed_vma)relocation < 0) 1379 { 1380 /* sign extend immediate */ 1381 if ((opcode & 0xf2000001) == 0x02000000) 1382 { 1383 /* ADD De.e,Dx.r,#I16 */ 1384 /* set SE bit */ 1385 opcode |= (1 << 1); 1386 } else 1387 return bfd_reloc_overflow; 1388 } 1389 1390 bfd_put_32 (input_bfd, opcode, hit_data); 1391 1392 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1393 contents, rel->r_offset, 1394 relocation, rel->r_addend); 1395 break; 1396 default: 1397 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1398 contents, rel->r_offset, 1399 relocation, rel->r_addend); 1400 } 1401 1402 return r; 1403} 1404 1405/* This is defined because R_METAG_NONE != 0... 1406 See RELOC_AGAINST_DISCARDED_SECTION for details. */ 1407#define METAG_RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \ 1408 rel, relend, howto, contents) \ 1409 { \ 1410 _bfd_clear_contents (howto, input_bfd, input_section, \ 1411 contents + rel->r_offset); \ 1412 \ 1413 if (bfd_link_relocatable (info) \ 1414 && (input_section->flags & SEC_DEBUGGING)) \ 1415 { \ 1416 /* Only remove relocations in debug sections since other \ 1417 sections may require relocations. */ \ 1418 Elf_Internal_Shdr *rel_hdr; \ 1419 \ 1420 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \ 1421 \ 1422 /* Avoid empty output section. */ \ 1423 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \ 1424 { \ 1425 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 1426 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \ 1427 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 1428 \ 1429 memmove (rel, rel + 1, (relend - rel) * sizeof (*rel)); \ 1430 \ 1431 input_section->reloc_count--; \ 1432 relend--; \ 1433 rel--; \ 1434 continue; \ 1435 } \ 1436 } \ 1437 \ 1438 rel->r_info = R_METAG_NONE; \ 1439 rel->r_addend = 0; \ 1440 continue; \ 1441 } 1442 1443/* Relocate a META ELF section. 1444 1445The RELOCATE_SECTION function is called by the new ELF backend linker 1446to handle the relocations for a section. 1447 1448The relocs are always passed as Rela structures; if the section 1449actually uses Rel structures, the r_addend field will always be 1450zero. 1451 1452This function is responsible for adjusting the section contents as 1453necessary, and (if using Rela relocs and generating a relocatable 1454output file) adjusting the reloc addend as necessary. 1455 1456This function does not have to worry about setting the reloc 1457address or the reloc symbol index. 1458 1459LOCAL_SYMS is a pointer to the swapped in local symbols. 1460 1461LOCAL_SECTIONS is an array giving the section in the input file 1462corresponding to the st_shndx field of each local symbol. 1463 1464The global hash table entry for the global symbols can be found 1465via elf_sym_hashes (input_bfd). 1466 1467When generating relocatable output, this function must handle 1468STB_LOCAL/STT_SECTION symbols specially. The output symbol is 1469going to be the section symbol corresponding to the output 1470section, which means that the addend must be adjusted 1471accordingly. */ 1472 1473static bfd_boolean 1474elf_metag_relocate_section (bfd *output_bfd, 1475 struct bfd_link_info *info, 1476 bfd *input_bfd, 1477 asection *input_section, 1478 bfd_byte *contents, 1479 Elf_Internal_Rela *relocs, 1480 Elf_Internal_Sym *local_syms, 1481 asection **local_sections) 1482{ 1483 bfd_vma *local_got_offsets; 1484 Elf_Internal_Shdr *symtab_hdr; 1485 struct elf_link_hash_entry **eh_syms; 1486 struct elf_metag_link_hash_table *htab; 1487 Elf_Internal_Rela *rel; 1488 Elf_Internal_Rela *relend; 1489 asection *sreloc; 1490 1491 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 1492 eh_syms = elf_sym_hashes (input_bfd); 1493 relend = relocs + input_section->reloc_count; 1494 1495 htab = metag_link_hash_table (info); 1496 local_got_offsets = elf_local_got_offsets (input_bfd); 1497 1498 sreloc = NULL; 1499 1500 for (rel = relocs; rel < relend; rel ++) 1501 { 1502 reloc_howto_type *howto; 1503 unsigned long r_symndx; 1504 Elf_Internal_Sym *sym; 1505 asection *sec; 1506 struct elf_metag_link_hash_entry *hh; 1507 bfd_vma relocation; 1508 bfd_reloc_status_type r; 1509 const char *name; 1510 int r_type; 1511 1512 r_type = ELF32_R_TYPE (rel->r_info); 1513 1514 if (r_type == R_METAG_GNU_VTINHERIT 1515 || r_type == R_METAG_GNU_VTENTRY 1516 || r_type == R_METAG_NONE) 1517 continue; 1518 1519 r_symndx = ELF32_R_SYM (rel->r_info); 1520 1521 howto = elf_metag_howto_table + ELF32_R_TYPE (rel->r_info); 1522 hh = NULL; 1523 sym = NULL; 1524 sec = NULL; 1525 1526 if (r_symndx < symtab_hdr->sh_info) 1527 { 1528 sym = local_syms + r_symndx; 1529 sec = local_sections [r_symndx]; 1530 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1531 1532 name = bfd_elf_string_from_elf_section 1533 (input_bfd, symtab_hdr->sh_link, sym->st_name); 1534 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; 1535 } 1536 else 1537 { 1538 struct elf_link_hash_entry *eh; 1539 bfd_boolean unresolved_reloc, warned, ignored; 1540 1541 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1542 r_symndx, symtab_hdr, eh_syms, 1543 eh, sec, relocation, 1544 unresolved_reloc, warned, ignored); 1545 1546 name = eh->root.root.string; 1547 hh = (struct elf_metag_link_hash_entry *) eh; 1548 } 1549 1550 if (sec != NULL && discarded_section (sec)) 1551 METAG_RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1552 rel, relend, howto, contents); 1553 1554 if (bfd_link_relocatable (info)) 1555 continue; 1556 1557 switch (r_type) 1558 { 1559 case R_METAG_ADDR32: 1560 case R_METAG_RELBRANCH: 1561 if ((input_section->flags & SEC_ALLOC) == 0) 1562 break; 1563 1564 if ((bfd_link_pic (info) 1565 && r_symndx != STN_UNDEF 1566 && (input_section->flags & SEC_ALLOC) != 0 1567 && (r_type != R_METAG_RELBRANCH 1568 || !SYMBOL_CALLS_LOCAL (info, &hh->eh))) 1569 || (!bfd_link_pic (info) 1570 && hh != NULL 1571 && hh->eh.dynindx != -1 1572 && !hh->eh.non_got_ref 1573 && ((hh->eh.def_dynamic 1574 && !hh->eh.def_regular) 1575 || hh->eh.root.type == bfd_link_hash_undefweak 1576 || hh->eh.root.type == bfd_link_hash_undefined))) 1577 { 1578 Elf_Internal_Rela outrel; 1579 bfd_boolean skip, relocate; 1580 bfd_byte *loc; 1581 1582 /* When generating a shared object, these relocations 1583 are copied into the output file to be resolved at run 1584 time. */ 1585 1586 sreloc = elf_section_data (input_section)->sreloc; 1587 BFD_ASSERT (sreloc != NULL); 1588 1589 skip = FALSE; 1590 relocate = FALSE; 1591 1592 outrel.r_offset = _bfd_elf_section_offset (output_bfd, 1593 info, 1594 input_section, 1595 rel->r_offset); 1596 if (outrel.r_offset == (bfd_vma) -1) 1597 skip = TRUE; 1598 else if (outrel.r_offset == (bfd_vma) -2) 1599 skip = TRUE, relocate = TRUE; 1600 outrel.r_offset += (input_section->output_section->vma 1601 + input_section->output_offset); 1602 1603 if (skip) 1604 { 1605 memset (&outrel, 0, sizeof outrel); 1606 outrel.r_info = ELF32_R_INFO (0, R_METAG_NONE); 1607 } 1608 else if (r_type == R_METAG_RELBRANCH) 1609 { 1610 BFD_ASSERT (hh != NULL && hh->eh.dynindx != -1); 1611 outrel.r_info = ELF32_R_INFO (hh->eh.dynindx, r_type); 1612 outrel.r_addend = rel->r_addend; 1613 } 1614 else 1615 { 1616 /* h->dynindx may be -1 if this symbol was marked to 1617 become local. */ 1618 if (hh == NULL 1619 || ((info->symbolic || hh->eh.dynindx == -1) 1620 && hh->eh.def_regular)) 1621 { 1622 relocate = TRUE; 1623 outrel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE); 1624 outrel.r_addend = relocation + rel->r_addend; 1625 } 1626 else 1627 { 1628 BFD_ASSERT (hh->eh.dynindx != -1); 1629 outrel.r_info = ELF32_R_INFO (hh->eh.dynindx, r_type); 1630 outrel.r_addend = rel->r_addend; 1631 } 1632 } 1633 1634 loc = sreloc->contents; 1635 loc += sreloc->reloc_count * sizeof(Elf32_External_Rela); 1636 bfd_elf32_swap_reloca_out (output_bfd, &outrel,loc); 1637 ++sreloc->reloc_count; 1638 1639 /* If this reloc is against an external symbol, we do 1640 not want to fiddle with the addend. Otherwise, we 1641 need to include the symbol value so that it becomes 1642 an addend for the dynamic reloc. */ 1643 if (! relocate) 1644 continue; 1645 } 1646 break; 1647 1648 case R_METAG_RELBRANCH_PLT: 1649 /* Relocation is to the entry for this symbol in the 1650 procedure linkage table. */ 1651 1652 if (hh == NULL) 1653 break; 1654 1655 if (hh->eh.forced_local) 1656 break; 1657 1658 if (hh->eh.plt.offset == (bfd_vma) -1 || htab->etab.splt == NULL) 1659 { 1660 /* We didn't make a PLT entry for this symbol. This 1661 happens when statically linking PIC code, or when 1662 using -Bsymbolic. */ 1663 break; 1664 } 1665 1666 relocation = (htab->etab.splt->output_section->vma 1667 + htab->etab.splt->output_offset 1668 + hh->eh.plt.offset); 1669 break; 1670 case R_METAG_HI16_GOTPC: 1671 case R_METAG_LO16_GOTPC: 1672 BFD_ASSERT (htab->etab.sgot != NULL); 1673 1674 relocation = (htab->etab.sgot->output_section->vma + 1675 htab->etab.sgot->output_offset); 1676 relocation += GOT_REG_OFFSET; 1677 relocation -= (input_section->output_section->vma 1678 + input_section->output_offset 1679 + rel->r_offset); 1680 break; 1681 case R_METAG_HI16_GOTOFF: 1682 case R_METAG_LO16_GOTOFF: 1683 case R_METAG_GETSET_GOTOFF: 1684 BFD_ASSERT (htab->etab.sgot != NULL); 1685 1686 relocation -= (htab->etab.sgot->output_section->vma + 1687 htab->etab.sgot->output_offset); 1688 relocation -= GOT_REG_OFFSET; 1689 break; 1690 case R_METAG_GETSET_GOT: 1691 { 1692 bfd_vma off; 1693 bfd_boolean do_got = 0; 1694 1695 /* Relocation is to the entry for this symbol in the 1696 global offset table. */ 1697 if (hh != NULL) 1698 { 1699 bfd_boolean dyn; 1700 1701 off = hh->eh.got.offset; 1702 dyn = htab->etab.dynamic_sections_created; 1703 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 1704 bfd_link_pic (info), 1705 &hh->eh)) 1706 { 1707 /* If we aren't going to call finish_dynamic_symbol, 1708 then we need to handle initialisation of the .got 1709 entry and create needed relocs here. Since the 1710 offset must always be a multiple of 4, we use the 1711 least significant bit to record whether we have 1712 initialised it already. */ 1713 if ((off & 1) != 0) 1714 off &= ~1; 1715 else 1716 { 1717 hh->eh.got.offset |= 1; 1718 do_got = 1; 1719 } 1720 } 1721 } 1722 else 1723 { 1724 /* Local symbol case. */ 1725 if (local_got_offsets == NULL) 1726 abort (); 1727 1728 off = local_got_offsets[r_symndx]; 1729 1730 /* The offset must always be a multiple of 4. We use 1731 the least significant bit to record whether we have 1732 already generated the necessary reloc. */ 1733 if ((off & 1) != 0) 1734 off &= ~1; 1735 else 1736 { 1737 local_got_offsets[r_symndx] |= 1; 1738 do_got = 1; 1739 } 1740 } 1741 1742 if (do_got) 1743 { 1744 if (bfd_link_pic (info)) 1745 { 1746 /* Output a dynamic relocation for this GOT entry. 1747 In this case it is relative to the base of the 1748 object because the symbol index is zero. */ 1749 Elf_Internal_Rela outrel; 1750 bfd_byte *loc; 1751 asection *s = htab->etab.srelgot; 1752 1753 outrel.r_offset = (off 1754 + htab->etab.sgot->output_offset 1755 + htab->etab.sgot->output_section->vma); 1756 outrel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE); 1757 outrel.r_addend = relocation; 1758 loc = s->contents; 1759 loc += s->reloc_count++ * sizeof (Elf32_External_Rela); 1760 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1761 } 1762 else 1763 bfd_put_32 (output_bfd, relocation, 1764 htab->etab.sgot->contents + off); 1765 } 1766 1767 if (off >= (bfd_vma) -2) 1768 abort (); 1769 1770 relocation = off - GOT_REG_OFFSET; 1771 } 1772 break; 1773 case R_METAG_TLS_GD: 1774 case R_METAG_TLS_IE: 1775 { 1776 /* XXXMJF There is room here for optimisations. For example 1777 converting from GD->IE, etc. */ 1778 bfd_vma off; 1779 int indx; 1780 char tls_type; 1781 1782 if (htab->etab.sgot == NULL) 1783 abort(); 1784 1785 indx = 0; 1786 if (hh != NULL) 1787 { 1788 bfd_boolean dyn; 1789 dyn = htab->etab.dynamic_sections_created; 1790 1791 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 1792 bfd_link_pic (info), 1793 &hh->eh) 1794 && (!bfd_link_pic (info) 1795 || !SYMBOL_REFERENCES_LOCAL (info, &hh->eh))) 1796 { 1797 indx = hh->eh.dynindx; 1798 } 1799 off = hh->eh.got.offset; 1800 tls_type = hh->tls_type; 1801 } 1802 else 1803 { 1804 /* Local symbol case. */ 1805 if (local_got_offsets == NULL) 1806 abort (); 1807 1808 off = local_got_offsets[r_symndx]; 1809 tls_type = metag_elf_local_got_tls_type (input_bfd) [r_symndx]; 1810 } 1811 1812 if (tls_type == GOT_UNKNOWN) 1813 abort (); 1814 1815 if ((off & 1) != 0) 1816 off &= ~1; 1817 else 1818 { 1819 bfd_boolean need_relocs = FALSE; 1820 Elf_Internal_Rela outrel; 1821 bfd_byte *loc = NULL; 1822 int cur_off = off; 1823 1824 /* The GOT entries have not been initialized yet. Do it 1825 now, and emit any relocations. If both an IE GOT and a 1826 GD GOT are necessary, we emit the GD first. */ 1827 1828 if ((bfd_link_pic (info) || indx != 0) 1829 && (hh == NULL 1830 || ELF_ST_VISIBILITY (hh->eh.other) == STV_DEFAULT 1831 || hh->eh.root.type != bfd_link_hash_undefweak)) 1832 { 1833 need_relocs = TRUE; 1834 loc = htab->etab.srelgot->contents; 1835 /* FIXME (CAO): Should this be reloc_count++ ? */ 1836 loc += htab->etab.srelgot->reloc_count * sizeof (Elf32_External_Rela); 1837 } 1838 1839 if (tls_type & GOT_TLS_GD) 1840 { 1841 if (need_relocs) 1842 { 1843 outrel.r_offset = (cur_off 1844 + htab->etab.sgot->output_section->vma 1845 + htab->etab.sgot->output_offset); 1846 outrel.r_info = ELF32_R_INFO (indx, R_METAG_TLS_DTPMOD); 1847 outrel.r_addend = 0; 1848 bfd_put_32 (output_bfd, 0, htab->etab.sgot->contents + cur_off); 1849 1850 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1851 htab->etab.srelgot->reloc_count++; 1852 loc += sizeof (Elf32_External_Rela); 1853 1854 if (indx == 0) 1855 bfd_put_32 (output_bfd, 0, 1856 htab->etab.sgot->contents + cur_off + 4); 1857 else 1858 { 1859 bfd_put_32 (output_bfd, 0, 1860 htab->etab.sgot->contents + cur_off + 4); 1861 outrel.r_info = ELF32_R_INFO (indx, 1862 R_METAG_TLS_DTPOFF); 1863 outrel.r_offset += 4; 1864 bfd_elf32_swap_reloca_out (output_bfd, 1865 &outrel, loc); 1866 htab->etab.srelgot->reloc_count++; 1867 loc += sizeof (Elf32_External_Rela); 1868 } 1869 } 1870 else 1871 { 1872 /* We don't support changing the TLS model. */ 1873 /* PR 20675 */ 1874 if (bfd_link_pic (info)) 1875 _bfd_error_handler (_("%B(%A): multiple TLS models are not supported"), 1876 input_bfd, input_section, name); 1877 else 1878 _bfd_error_handler (_("%B(%A): shared library symbol %s encountered whilst performing a static link"), 1879 input_bfd, input_section, name); 1880 return FALSE; 1881 } 1882 1883 cur_off += 8; 1884 } 1885 1886 if (tls_type & GOT_TLS_IE) 1887 { 1888 if (need_relocs) 1889 { 1890 outrel.r_offset = (cur_off 1891 + htab->etab.sgot->output_section->vma 1892 + htab->etab.sgot->output_offset); 1893 outrel.r_info = ELF32_R_INFO (indx, R_METAG_TLS_TPOFF); 1894 1895 if (indx == 0) 1896 outrel.r_addend = relocation - dtpoff_base (info); 1897 else 1898 outrel.r_addend = 0; 1899 1900 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1901 htab->etab.srelgot->reloc_count++; 1902 loc += sizeof (Elf32_External_Rela); 1903 } 1904 else 1905 bfd_put_32 (output_bfd, tpoff (info, relocation), 1906 htab->etab.sgot->contents + cur_off); 1907 1908 cur_off += 4; 1909 } 1910 1911 if (hh != NULL) 1912 hh->eh.got.offset |= 1; 1913 else 1914 local_got_offsets[r_symndx] |= 1; 1915 } 1916 1917 /* Add the base of the GOT to the relocation value. */ 1918 relocation = off - GOT_REG_OFFSET; 1919 1920 break; 1921 } 1922 1923 case R_METAG_TLS_IENONPIC_HI16: 1924 case R_METAG_TLS_IENONPIC_LO16: 1925 case R_METAG_TLS_LE_HI16: 1926 case R_METAG_TLS_LE_LO16: 1927 if (bfd_link_pic (info)) 1928 { 1929 _bfd_error_handler 1930 /* xgettext:c-format */ 1931 (_("%B(%A+0x%lx): R_METAG_TLS_LE/IENONPIC relocation not permitted in shared object"), 1932 input_bfd, input_section, 1933 (long) rel->r_offset, howto->name); 1934 return FALSE; 1935 } 1936 else 1937 relocation = tpoff (info, relocation); 1938 break; 1939 case R_METAG_TLS_LDO_HI16: 1940 case R_METAG_TLS_LDO_LO16: 1941 if (! bfd_link_pic (info)) 1942 relocation = tpoff (info, relocation); 1943 else 1944 relocation -= dtpoff_base (info); 1945 break; 1946 case R_METAG_TLS_LDM: 1947 { 1948 bfd_vma off; 1949 1950 if (htab->etab.sgot == NULL) 1951 abort(); 1952 off = htab->tls_ldm_got.offset; 1953 if (off & 1) 1954 off &= ~1; 1955 else 1956 { 1957 Elf_Internal_Rela outrel; 1958 bfd_byte *loc; 1959 1960 outrel.r_offset = (off 1961 + htab->etab.sgot->output_section->vma 1962 + htab->etab.sgot->output_offset); 1963 1964 outrel.r_addend = 0; 1965 outrel.r_info = ELF32_R_INFO (0, R_METAG_TLS_DTPMOD); 1966 loc = htab->etab.srelgot->contents; 1967 loc += htab->etab.srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 1968 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1969 htab->tls_ldm_got.offset |= 1; 1970 } 1971 1972 relocation = off - GOT_REG_OFFSET; 1973 break; 1974 } 1975 default: 1976 break; 1977 } 1978 1979 r = metag_final_link_relocate (howto, input_bfd, input_section, 1980 contents, rel, relocation, hh, htab, 1981 sec); 1982 1983 if (r != bfd_reloc_ok) 1984 { 1985 const char * msg = (const char *) NULL; 1986 1987 switch (r) 1988 { 1989 case bfd_reloc_overflow: 1990 (*info->callbacks->reloc_overflow) 1991 (info, (hh ? &hh->eh.root : NULL), name, howto->name, 1992 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1993 break; 1994 1995 case bfd_reloc_undefined: 1996 (*info->callbacks->undefined_symbol) 1997 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 1998 break; 1999 2000 case bfd_reloc_outofrange: 2001 msg = _("internal error: out of range error"); 2002 break; 2003 2004 case bfd_reloc_notsupported: 2005 msg = _("internal error: unsupported relocation error"); 2006 break; 2007 2008 case bfd_reloc_dangerous: 2009 msg = _("internal error: dangerous relocation"); 2010 break; 2011 2012 default: 2013 msg = _("internal error: unknown error"); 2014 break; 2015 } 2016 2017 if (msg) 2018 (*info->callbacks->warning) (info, msg, name, input_bfd, 2019 input_section, rel->r_offset); 2020 } 2021 } 2022 2023 return TRUE; 2024} 2025 2026/* Create the .plt and .got sections, and set up our hash table 2027 short-cuts to various dynamic sections. */ 2028 2029static bfd_boolean 2030elf_metag_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) 2031{ 2032 struct elf_metag_link_hash_table *htab; 2033 struct elf_link_hash_entry *eh; 2034 struct bfd_link_hash_entry *bh; 2035 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 2036 2037 /* Don't try to create the .plt and .got twice. */ 2038 htab = metag_link_hash_table (info); 2039 if (htab->etab.splt != NULL) 2040 return TRUE; 2041 2042 /* Call the generic code to do most of the work. */ 2043 if (! _bfd_elf_create_dynamic_sections (abfd, info)) 2044 return FALSE; 2045 2046 /* The header goes at the start of the dynamic .got section, which 2047 is placed after the dynamic .got.plt section. ie. The header is 2048 not necessarily at the start of the output .got section. */ 2049 htab->etab.sgot->size += 12; 2050 2051 /* Define the symbol __GLOBAL_OFFSET_TABLE__ on the header. */ 2052 bh = NULL; 2053 if (!(_bfd_generic_link_add_one_symbol 2054 (info, abfd, "__GLOBAL_OFFSET_TABLE__", BSF_GLOBAL, htab->etab.sgot, 2055 (bfd_vma) 0, NULL, FALSE, bed->collect, &bh))) 2056 return FALSE; 2057 eh = (struct elf_link_hash_entry *) bh; 2058 eh->def_regular = 1; 2059 eh->type = STT_OBJECT; 2060 eh->other = STV_HIDDEN; 2061 2062 if (! bfd_link_executable (info) 2063 && ! bfd_elf_link_record_dynamic_symbol (info, eh)) 2064 return FALSE; 2065 2066 htab->etab.hgot = eh; 2067 2068 return TRUE; 2069} 2070 2071/* Look through the relocs for a section during the first phase, and 2072 calculate needed space in the global offset table, procedure linkage 2073 table, and dynamic reloc sections. At this point we haven't 2074 necessarily read all the input files. */ 2075 2076static bfd_boolean 2077elf_metag_check_relocs (bfd *abfd, 2078 struct bfd_link_info *info, 2079 asection *sec, 2080 const Elf_Internal_Rela *relocs) 2081{ 2082 Elf_Internal_Shdr *symtab_hdr; 2083 struct elf_link_hash_entry **eh_syms; 2084 const Elf_Internal_Rela *rel; 2085 const Elf_Internal_Rela *rel_end; 2086 struct elf_metag_link_hash_table *htab; 2087 asection *sreloc; 2088 bfd *dynobj; 2089 int tls_type = GOT_UNKNOWN, old_tls_type = GOT_UNKNOWN; 2090 2091 if (bfd_link_relocatable (info)) 2092 return TRUE; 2093 2094 htab = metag_link_hash_table (info); 2095 dynobj = htab->etab.dynobj; 2096 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2097 eh_syms = elf_sym_hashes (abfd); 2098 sreloc = NULL; 2099 2100 if (htab == NULL) 2101 return FALSE; 2102 2103 rel_end = relocs + sec->reloc_count; 2104 for (rel = relocs; rel < rel_end; rel++) 2105 { 2106 int r_type; 2107 struct elf_metag_link_hash_entry *hh; 2108 Elf_Internal_Sym *isym; 2109 unsigned long r_symndx; 2110 2111 r_symndx = ELF32_R_SYM (rel->r_info); 2112 r_type = ELF32_R_TYPE (rel->r_info); 2113 if (r_symndx < symtab_hdr->sh_info) 2114 { 2115 /* A local symbol. */ 2116 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 2117 abfd, r_symndx); 2118 if (isym == NULL) 2119 return FALSE; 2120 2121 hh = NULL; 2122 } 2123 else 2124 { 2125 isym = NULL; 2126 2127 hh = (struct elf_metag_link_hash_entry *) 2128 eh_syms[r_symndx - symtab_hdr->sh_info]; 2129 while (hh->eh.root.type == bfd_link_hash_indirect 2130 || hh->eh.root.type == bfd_link_hash_warning) 2131 hh = (struct elf_metag_link_hash_entry *) hh->eh.root.u.i.link; 2132 2133 /* PR15323, ref flags aren't set for references in the same 2134 object. */ 2135 hh->eh.root.non_ir_ref = 1; 2136 } 2137 2138 /* Some relocs require a global offset table. */ 2139 if (htab->etab.sgot == NULL) 2140 { 2141 switch (r_type) 2142 { 2143 case R_METAG_TLS_GD: 2144 case R_METAG_TLS_LDM: 2145 case R_METAG_TLS_IE: 2146 if (bfd_link_pic (info)) 2147 info->flags |= DF_STATIC_TLS; 2148 /* Fall through. */ 2149 2150 case R_METAG_HI16_GOTOFF: 2151 case R_METAG_LO16_GOTOFF: 2152 case R_METAG_GETSET_GOTOFF: 2153 case R_METAG_GETSET_GOT: 2154 case R_METAG_HI16_GOTPC: 2155 case R_METAG_LO16_GOTPC: 2156 if (dynobj == NULL) 2157 htab->etab.dynobj = dynobj = abfd; 2158 if (!elf_metag_create_dynamic_sections (dynobj, info)) 2159 return FALSE; 2160 break; 2161 2162 default: 2163 break; 2164 } 2165 } 2166 2167 switch (r_type) 2168 { 2169 case R_METAG_TLS_IE: 2170 case R_METAG_TLS_GD: 2171 case R_METAG_GETSET_GOT: 2172 switch (r_type) 2173 { 2174 default: 2175 tls_type = GOT_NORMAL; 2176 break; 2177 case R_METAG_TLS_IE: 2178 tls_type = GOT_TLS_IE; 2179 break; 2180 case R_METAG_TLS_GD: 2181 tls_type = GOT_TLS_GD; 2182 break; 2183 } 2184 2185 if (hh != NULL) 2186 { 2187 hh->eh.got.refcount += 1; 2188 old_tls_type = hh->tls_type; 2189 } 2190 else 2191 { 2192 bfd_signed_vma *local_got_refcounts; 2193 2194 /* This is a global offset table entry for a local 2195 symbol. */ 2196 local_got_refcounts = elf_local_got_refcounts (abfd); 2197 if (local_got_refcounts == NULL) 2198 { 2199 bfd_size_type size; 2200 2201 size = symtab_hdr->sh_info; 2202 size *= sizeof (bfd_signed_vma); 2203 /* Add in space to store the local GOT TLS types. */ 2204 size += symtab_hdr->sh_info; 2205 local_got_refcounts = ((bfd_signed_vma *) 2206 bfd_zalloc (abfd, size)); 2207 if (local_got_refcounts == NULL) 2208 return FALSE; 2209 elf_local_got_refcounts (abfd) = local_got_refcounts; 2210 memset (metag_elf_local_got_tls_type (abfd), 2211 GOT_UNKNOWN, symtab_hdr->sh_info); 2212 } 2213 local_got_refcounts[r_symndx] += 1; 2214 old_tls_type = metag_elf_local_got_tls_type (abfd) [r_symndx]; 2215 } 2216 2217 if (old_tls_type != tls_type) 2218 { 2219 if (hh != NULL) 2220 { 2221 hh->tls_type = tls_type; 2222 } 2223 else 2224 { 2225 metag_elf_local_got_tls_type (abfd) [r_symndx] = tls_type; 2226 } 2227 } 2228 2229 break; 2230 2231 case R_METAG_TLS_LDM: 2232 metag_link_hash_table (info)->tls_ldm_got.refcount += 1; 2233 break; 2234 2235 case R_METAG_RELBRANCH_PLT: 2236 /* This symbol requires a procedure linkage table entry. We 2237 actually build the entry in adjust_dynamic_symbol, 2238 because this might be a case of linking PIC code without 2239 linking in any dynamic objects, in which case we don't 2240 need to generate a procedure linkage table after all. */ 2241 2242 /* If this is a local symbol, we resolve it directly without 2243 creating a procedure linkage table entry. */ 2244 if (hh == NULL) 2245 continue; 2246 2247 if (hh->eh.forced_local) 2248 break; 2249 2250 hh->eh.needs_plt = 1; 2251 hh->eh.plt.refcount += 1; 2252 break; 2253 2254 case R_METAG_HIADDR16: 2255 case R_METAG_LOADDR16: 2256 /* Let's help debug shared library creation. These relocs 2257 cannot be used in shared libs. Don't error out for 2258 sections we don't care about, such as debug sections or 2259 non-constant sections. */ 2260 if (bfd_link_pic (info) 2261 && (sec->flags & SEC_ALLOC) != 0 2262 && (sec->flags & SEC_READONLY) != 0) 2263 { 2264 const char *name; 2265 2266 if (hh) 2267 name = hh->eh.root.root.string; 2268 else 2269 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); 2270 _bfd_error_handler 2271 /* xgettext:c-format */ 2272 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), 2273 abfd, elf_metag_howto_table[r_type].name, name); 2274 bfd_set_error (bfd_error_bad_value); 2275 return FALSE; 2276 } 2277 2278 /* Fall through. */ 2279 case R_METAG_ADDR32: 2280 case R_METAG_RELBRANCH: 2281 case R_METAG_GETSETOFF: 2282 if (hh != NULL && !bfd_link_pic (info)) 2283 { 2284 hh->eh.non_got_ref = 1; 2285 hh->eh.plt.refcount += 1; 2286 } 2287 2288 /* If we are creating a shared library, and this is a reloc 2289 against a global symbol, or a non PC relative reloc 2290 against a local symbol, then we need to copy the reloc 2291 into the shared library. However, if we are linking with 2292 -Bsymbolic, we do not need to copy a reloc against a 2293 global symbol which is defined in an object we are 2294 including in the link (i.e., DEF_REGULAR is set). At 2295 this point we have not seen all the input files, so it is 2296 possible that DEF_REGULAR is not set now but will be set 2297 later (it is never cleared). We account for that 2298 possibility below by storing information in the 2299 dyn_relocs field of the hash table entry. A similar 2300 situation occurs when creating shared libraries and symbol 2301 visibility changes render the symbol local. 2302 2303 If on the other hand, we are creating an executable, we 2304 may need to keep relocations for symbols satisfied by a 2305 dynamic library if we manage to avoid copy relocs for the 2306 symbol. */ 2307 if ((bfd_link_pic (info) 2308 && (sec->flags & SEC_ALLOC) != 0 2309 && (r_type != R_METAG_RELBRANCH 2310 || (hh != NULL 2311 && (! info->symbolic 2312 || hh->eh.root.type == bfd_link_hash_defweak 2313 || !hh->eh.def_regular)))) 2314 || (!bfd_link_pic (info) 2315 && (sec->flags & SEC_ALLOC) != 0 2316 && hh != NULL 2317 && (hh->eh.root.type == bfd_link_hash_defweak 2318 || !hh->eh.def_regular))) 2319 { 2320 struct elf_metag_dyn_reloc_entry *hdh_p; 2321 struct elf_metag_dyn_reloc_entry **hdh_head; 2322 2323 if (dynobj == NULL) 2324 htab->etab.dynobj = dynobj = abfd; 2325 2326 /* When creating a shared object, we must copy these 2327 relocs into the output file. We create a reloc 2328 section in dynobj and make room for the reloc. */ 2329 if (sreloc == NULL) 2330 { 2331 sreloc = _bfd_elf_make_dynamic_reloc_section 2332 (sec, htab->etab.dynobj, 2, abfd, /*rela?*/ TRUE); 2333 2334 if (sreloc == NULL) 2335 { 2336 bfd_set_error (bfd_error_bad_value); 2337 return FALSE; 2338 } 2339 2340 elf_section_data (sec)->sreloc = sreloc; 2341 } 2342 2343 /* If this is a global symbol, we count the number of 2344 relocations we need for this symbol. */ 2345 if (hh != NULL) 2346 hdh_head = &((struct elf_metag_link_hash_entry *) hh)->dyn_relocs; 2347 else 2348 { 2349 /* Track dynamic relocs needed for local syms too. */ 2350 asection *sr; 2351 void *vpp; 2352 2353 sr = bfd_section_from_elf_index (abfd, isym->st_shndx); 2354 if (sr == NULL) 2355 sr = sec; 2356 2357 vpp = &elf_section_data (sr)->local_dynrel; 2358 hdh_head = (struct elf_metag_dyn_reloc_entry **) vpp; 2359 } 2360 2361 hdh_p = *hdh_head; 2362 if (hdh_p == NULL || hdh_p->sec != sec) 2363 { 2364 hdh_p = ((struct elf_metag_dyn_reloc_entry *) 2365 bfd_alloc (dynobj, sizeof *hdh_p)); 2366 if (hdh_p == NULL) 2367 return FALSE; 2368 hdh_p->hdh_next = *hdh_head; 2369 *hdh_head = hdh_p; 2370 hdh_p->sec = sec; 2371 hdh_p->count = 0; 2372 hdh_p->relative_count = 0; 2373 } 2374 2375 hdh_p->count += 1; 2376 if (ELF32_R_TYPE (rel->r_info) == R_METAG_RELBRANCH) 2377 hdh_p->relative_count += 1; 2378 } 2379 break; 2380 2381 /* This relocation describes the C++ object vtable hierarchy. 2382 Reconstruct it for later use during GC. */ 2383 case R_METAG_GNU_VTINHERIT: 2384 if (!bfd_elf_gc_record_vtinherit (abfd, sec, &hh->eh, 2385 rel->r_offset)) 2386 return FALSE; 2387 break; 2388 2389 /* This relocation describes which C++ vtable entries are actually 2390 used. Record for later use during GC. */ 2391 case R_METAG_GNU_VTENTRY: 2392 BFD_ASSERT (hh != NULL); 2393 if (hh != NULL 2394 && !bfd_elf_gc_record_vtentry (abfd, sec, &hh->eh, rel->r_addend)) 2395 return FALSE; 2396 break; 2397 } 2398 } 2399 2400 return TRUE; 2401} 2402 2403/* Copy the extra info we tack onto an elf_link_hash_entry. */ 2404 2405static void 2406elf_metag_copy_indirect_symbol (struct bfd_link_info *info, 2407 struct elf_link_hash_entry *eh_dir, 2408 struct elf_link_hash_entry *eh_ind) 2409{ 2410 struct elf_metag_link_hash_entry *hh_dir, *hh_ind; 2411 2412 hh_dir = metag_elf_hash_entry (eh_dir); 2413 hh_ind = metag_elf_hash_entry (eh_ind); 2414 2415 if (hh_ind->dyn_relocs != NULL) 2416 { 2417 if (hh_dir->dyn_relocs != NULL) 2418 { 2419 struct elf_metag_dyn_reloc_entry **hdh_pp; 2420 struct elf_metag_dyn_reloc_entry *hdh_p; 2421 2422 if (eh_ind->root.type == bfd_link_hash_indirect) 2423 abort (); 2424 2425 /* Add reloc counts against the weak sym to the strong sym 2426 list. Merge any entries against the same section. */ 2427 for (hdh_pp = &hh_ind->dyn_relocs; (hdh_p = *hdh_pp) != NULL; ) 2428 { 2429 struct elf_metag_dyn_reloc_entry *hdh_q; 2430 2431 for (hdh_q = hh_dir->dyn_relocs; hdh_q != NULL; 2432 hdh_q = hdh_q->hdh_next) 2433 if (hdh_q->sec == hdh_p->sec) 2434 { 2435 hdh_q->relative_count += hdh_p->relative_count; 2436 hdh_q->count += hdh_p->count; 2437 *hdh_pp = hdh_p->hdh_next; 2438 break; 2439 } 2440 if (hdh_q == NULL) 2441 hdh_pp = &hdh_p->hdh_next; 2442 } 2443 *hdh_pp = hh_dir->dyn_relocs; 2444 } 2445 2446 hh_dir->dyn_relocs = hh_ind->dyn_relocs; 2447 hh_ind->dyn_relocs = NULL; 2448 } 2449 2450 if (eh_ind->root.type == bfd_link_hash_indirect 2451 && eh_dir->got.refcount <= 0) 2452 { 2453 hh_dir->tls_type = hh_ind->tls_type; 2454 hh_ind->tls_type = GOT_UNKNOWN; 2455 } 2456 2457 _bfd_elf_link_hash_copy_indirect (info, eh_dir, eh_ind); 2458} 2459 2460/* Adjust a symbol defined by a dynamic object and referenced by a 2461 regular object. The current definition is in some section of the 2462 dynamic object, but we're not including those sections. We have to 2463 change the definition to something the rest of the link can 2464 understand. */ 2465 2466static bfd_boolean 2467elf_metag_adjust_dynamic_symbol (struct bfd_link_info *info, 2468 struct elf_link_hash_entry *eh) 2469{ 2470 struct elf_metag_link_hash_table *htab; 2471 struct elf_metag_link_hash_entry *hh; 2472 struct elf_metag_dyn_reloc_entry *hdh_p; 2473 asection *s, *srel; 2474 2475 /* If this is a function, put it in the procedure linkage table. We 2476 will fill in the contents of the procedure linkage table later, 2477 when we know the address of the .got section. */ 2478 if (eh->type == STT_FUNC 2479 || eh->needs_plt) 2480 { 2481 if (eh->plt.refcount <= 0 2482 || SYMBOL_CALLS_LOCAL (info, eh) 2483 || (ELF_ST_VISIBILITY (eh->other) != STV_DEFAULT 2484 && eh->root.type == bfd_link_hash_undefweak)) 2485 { 2486 /* This case can occur if we saw a PLT reloc in an input 2487 file, but the symbol was never referred to by a dynamic 2488 object. In such a case, we don't actually need to build 2489 a procedure linkage table, and we can just do a PCREL 2490 reloc instead. */ 2491 eh->plt.offset = (bfd_vma) -1; 2492 eh->needs_plt = 0; 2493 } 2494 2495 return TRUE; 2496 } 2497 else 2498 eh->plt.offset = (bfd_vma) -1; 2499 2500 /* If this is a weak symbol, and there is a real definition, the 2501 processor independent code will have arranged for us to see the 2502 real definition first, and we can just use the same value. */ 2503 if (eh->u.weakdef != NULL) 2504 { 2505 if (eh->u.weakdef->root.type != bfd_link_hash_defined 2506 && eh->u.weakdef->root.type != bfd_link_hash_defweak) 2507 abort (); 2508 eh->root.u.def.section = eh->u.weakdef->root.u.def.section; 2509 eh->root.u.def.value = eh->u.weakdef->root.u.def.value; 2510 eh->non_got_ref = eh->u.weakdef->non_got_ref; 2511 return TRUE; 2512 } 2513 2514 /* This is a reference to a symbol defined by a dynamic object which 2515 is not a function. */ 2516 2517 /* If we are creating a shared library, we must presume that the 2518 only references to the symbol are via the global offset table. 2519 For such cases we need not do anything here; the relocations will 2520 be handled correctly by relocate_section. */ 2521 if (bfd_link_pic (info)) 2522 return TRUE; 2523 2524 /* If there are no references to this symbol that do not use the 2525 GOT, we don't need to generate a copy reloc. */ 2526 if (!eh->non_got_ref) 2527 return TRUE; 2528 2529 /* If -z nocopyreloc was given, we won't generate them either. */ 2530 if (info->nocopyreloc) 2531 { 2532 eh->non_got_ref = 0; 2533 return TRUE; 2534 } 2535 2536 hh = (struct elf_metag_link_hash_entry *) eh; 2537 for (hdh_p = hh->dyn_relocs; hdh_p != NULL; hdh_p = hdh_p->hdh_next) 2538 { 2539 s = hdh_p->sec->output_section; 2540 if (s != NULL && (s->flags & SEC_READONLY) != 0) 2541 break; 2542 } 2543 2544 /* If we didn't find any dynamic relocs in read-only sections, then 2545 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 2546 if (hdh_p == NULL) 2547 { 2548 eh->non_got_ref = 0; 2549 return TRUE; 2550 } 2551 2552 /* We must allocate the symbol in our .dynbss section, which will 2553 become part of the .bss section of the executable. There will be 2554 an entry for this symbol in the .dynsym section. The dynamic 2555 object will contain position independent code, so all references 2556 from the dynamic object to this symbol will go through the global 2557 offset table. The dynamic linker will use the .dynsym entry to 2558 determine the address it must put in the global offset table, so 2559 both the dynamic object and the regular object will refer to the 2560 same memory location for the variable. */ 2561 2562 htab = metag_link_hash_table (info); 2563 2564 /* We must generate a COPY reloc to tell the dynamic linker to 2565 copy the initial value out of the dynamic object and into the 2566 runtime process image. */ 2567 if ((eh->root.u.def.section->flags & SEC_READONLY) != 0) 2568 { 2569 s = htab->etab.sdynrelro; 2570 srel = htab->etab.sreldynrelro; 2571 } 2572 else 2573 { 2574 s = htab->etab.sdynbss; 2575 srel = htab->etab.srelbss; 2576 } 2577 if ((eh->root.u.def.section->flags & SEC_ALLOC) != 0 && eh->size != 0) 2578 { 2579 srel->size += sizeof (Elf32_External_Rela); 2580 eh->needs_copy = 1; 2581 } 2582 2583 return _bfd_elf_adjust_dynamic_copy (info, eh, s); 2584} 2585 2586/* Allocate space in .plt, .got and associated reloc sections for 2587 global syms. */ 2588 2589static bfd_boolean 2590allocate_dynrelocs (struct elf_link_hash_entry *eh, void *inf) 2591{ 2592 struct bfd_link_info *info; 2593 struct elf_metag_link_hash_table *htab; 2594 struct elf_metag_link_hash_entry *hh; 2595 struct elf_metag_dyn_reloc_entry *hdh_p; 2596 2597 if (eh->root.type == bfd_link_hash_indirect) 2598 return TRUE; 2599 2600 if (eh->root.type == bfd_link_hash_warning) 2601 eh = (struct elf_link_hash_entry *) eh->root.u.i.link; 2602 2603 info = inf; 2604 htab = metag_link_hash_table (info); 2605 2606 if (htab->etab.dynamic_sections_created 2607 && eh->plt.refcount > 0) 2608 { 2609 /* Make sure this symbol is output as a dynamic symbol. 2610 Undefined weak syms won't yet be marked as dynamic. */ 2611 if (eh->dynindx == -1 2612 && !eh->forced_local) 2613 { 2614 if (! bfd_elf_link_record_dynamic_symbol (info, eh)) 2615 return FALSE; 2616 } 2617 2618 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), eh)) 2619 { 2620 asection *s = htab->etab.splt; 2621 2622 /* If this is the first .plt entry, make room for the special 2623 first entry. */ 2624 if (s->size == 0) 2625 s->size += PLT_ENTRY_SIZE; 2626 2627 eh->plt.offset = s->size; 2628 2629 /* If this symbol is not defined in a regular file, and we are 2630 not generating a shared library, then set the symbol to this 2631 location in the .plt. This is required to make function 2632 pointers compare as equal between the normal executable and 2633 the shared library. */ 2634 if (! bfd_link_pic (info) 2635 && !eh->def_regular) 2636 { 2637 eh->root.u.def.section = s; 2638 eh->root.u.def.value = eh->plt.offset; 2639 } 2640 2641 /* Make room for this entry. */ 2642 s->size += PLT_ENTRY_SIZE; 2643 2644 /* We also need to make an entry in the .got.plt section, which 2645 will be placed in the .got section by the linker script. */ 2646 htab->etab.sgotplt->size += 4; 2647 2648 /* We also need to make an entry in the .rel.plt section. */ 2649 htab->etab.srelplt->size += sizeof (Elf32_External_Rela); 2650 } 2651 else 2652 { 2653 eh->plt.offset = (bfd_vma) -1; 2654 eh->needs_plt = 0; 2655 } 2656 } 2657 else 2658 { 2659 eh->plt.offset = (bfd_vma) -1; 2660 eh->needs_plt = 0; 2661 } 2662 2663 if (eh->got.refcount > 0) 2664 { 2665 asection *s; 2666 bfd_boolean dyn; 2667 int tls_type = metag_elf_hash_entry (eh)->tls_type; 2668 2669 /* Make sure this symbol is output as a dynamic symbol. 2670 Undefined weak syms won't yet be marked as dynamic. */ 2671 if (eh->dynindx == -1 2672 && !eh->forced_local) 2673 { 2674 if (! bfd_elf_link_record_dynamic_symbol (info, eh)) 2675 return FALSE; 2676 } 2677 2678 s = htab->etab.sgot; 2679 2680 eh->got.offset = s->size; 2681 s->size += 4; 2682 /* R_METAG_TLS_GD needs 2 consecutive GOT slots. */ 2683 if (tls_type == GOT_TLS_GD) 2684 s->size += 4; 2685 dyn = htab->etab.dynamic_sections_created; 2686 /* R_METAG_TLS_IE needs one dynamic relocation if dynamic, 2687 R_METAG_TLS_GD needs one if local symbol and two if global. */ 2688 if ((tls_type == GOT_TLS_GD && eh->dynindx == -1) 2689 || (tls_type == GOT_TLS_IE && dyn)) 2690 htab->etab.srelgot->size += sizeof (Elf32_External_Rela); 2691 else if (tls_type == GOT_TLS_GD) 2692 htab->etab.srelgot->size += 2 * sizeof (Elf32_External_Rela); 2693 else if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 2694 bfd_link_pic (info), 2695 eh)) 2696 htab->etab.srelgot->size += sizeof (Elf32_External_Rela); 2697 } 2698 else 2699 eh->got.offset = (bfd_vma) -1; 2700 2701 hh = (struct elf_metag_link_hash_entry *) eh; 2702 if (hh->dyn_relocs == NULL) 2703 return TRUE; 2704 2705 /* If this is a -Bsymbolic shared link, then we need to discard all 2706 space allocated for dynamic pc-relative relocs against symbols 2707 defined in a regular object. For the normal shared case, discard 2708 space for relocs that have become local due to symbol visibility 2709 changes. */ 2710 if (bfd_link_pic (info)) 2711 { 2712 if (SYMBOL_CALLS_LOCAL (info, eh)) 2713 { 2714 struct elf_metag_dyn_reloc_entry **hdh_pp; 2715 2716 for (hdh_pp = &hh->dyn_relocs; (hdh_p = *hdh_pp) != NULL; ) 2717 { 2718 hdh_p->count -= hdh_p->relative_count; 2719 hdh_p->relative_count = 0; 2720 if (hdh_p->count == 0) 2721 *hdh_pp = hdh_p->hdh_next; 2722 else 2723 hdh_pp = &hdh_p->hdh_next; 2724 } 2725 } 2726 2727 /* Also discard relocs on undefined weak syms with non-default 2728 visibility. */ 2729 if (hh->dyn_relocs != NULL 2730 && eh->root.type == bfd_link_hash_undefweak) 2731 { 2732 if (ELF_ST_VISIBILITY (eh->other) != STV_DEFAULT) 2733 hh->dyn_relocs = NULL; 2734 2735 /* Make sure undefined weak symbols are output as a dynamic 2736 symbol in PIEs. */ 2737 else if (eh->dynindx == -1 2738 && !eh->forced_local) 2739 { 2740 if (! bfd_elf_link_record_dynamic_symbol (info, eh)) 2741 return FALSE; 2742 } 2743 } 2744 } 2745 else 2746 { 2747 /* For the non-shared case, discard space for relocs against 2748 symbols which turn out to need copy relocs or are not 2749 dynamic. */ 2750 if (!eh->non_got_ref 2751 && ((eh->def_dynamic 2752 && !eh->def_regular) 2753 || (htab->etab.dynamic_sections_created 2754 && (eh->root.type == bfd_link_hash_undefweak 2755 || eh->root.type == bfd_link_hash_undefined)))) 2756 { 2757 /* Make sure this symbol is output as a dynamic symbol. 2758 Undefined weak syms won't yet be marked as dynamic. */ 2759 if (eh->dynindx == -1 2760 && !eh->forced_local) 2761 { 2762 if (! bfd_elf_link_record_dynamic_symbol (info, eh)) 2763 return FALSE; 2764 } 2765 2766 /* If that succeeded, we know we'll be keeping all the 2767 relocs. */ 2768 if (eh->dynindx != -1) 2769 goto keep; 2770 } 2771 2772 hh->dyn_relocs = NULL; 2773 return TRUE; 2774 2775 keep: ; 2776 } 2777 2778 /* Finally, allocate space. */ 2779 for (hdh_p = hh->dyn_relocs; hdh_p != NULL; hdh_p = hdh_p->hdh_next) 2780 { 2781 asection *sreloc = elf_section_data (hdh_p->sec)->sreloc; 2782 sreloc->size += hdh_p->count * sizeof (Elf32_External_Rela); 2783 } 2784 2785 return TRUE; 2786} 2787 2788/* Find any dynamic relocs that apply to read-only sections. */ 2789 2790static bfd_boolean 2791readonly_dynrelocs (struct elf_link_hash_entry *eh, void *inf) 2792{ 2793 struct elf_metag_link_hash_entry *hh; 2794 struct elf_metag_dyn_reloc_entry *hdh_p; 2795 2796 if (eh->root.type == bfd_link_hash_warning) 2797 eh = (struct elf_link_hash_entry *) eh->root.u.i.link; 2798 2799 hh = (struct elf_metag_link_hash_entry *) eh; 2800 for (hdh_p = hh->dyn_relocs; hdh_p != NULL; hdh_p = hdh_p->hdh_next) 2801 { 2802 asection *s = hdh_p->sec->output_section; 2803 2804 if (s != NULL && (s->flags & SEC_READONLY) != 0) 2805 { 2806 struct bfd_link_info *info = inf; 2807 2808 info->flags |= DF_TEXTREL; 2809 2810 /* Not an error, just cut short the traversal. */ 2811 return FALSE; 2812 } 2813 } 2814 return TRUE; 2815} 2816 2817/* Set the sizes of the dynamic sections. */ 2818 2819static bfd_boolean 2820elf_metag_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 2821 struct bfd_link_info *info) 2822{ 2823 struct elf_metag_link_hash_table *htab; 2824 bfd *dynobj; 2825 bfd *ibfd; 2826 asection *s; 2827 bfd_boolean relocs; 2828 2829 htab = metag_link_hash_table (info); 2830 dynobj = htab->etab.dynobj; 2831 if (dynobj == NULL) 2832 abort (); 2833 2834 if (htab->etab.dynamic_sections_created) 2835 { 2836 /* Set the contents of the .interp section to the interpreter. */ 2837 if (bfd_link_executable (info) && !info->nointerp) 2838 { 2839 s = bfd_get_linker_section (dynobj, ".interp"); 2840 if (s == NULL) 2841 abort (); 2842 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2843 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2844 } 2845 } 2846 2847 /* Set up .got offsets for local syms, and space for local dynamic 2848 relocs. */ 2849 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 2850 { 2851 bfd_signed_vma *local_got; 2852 bfd_signed_vma *end_local_got; 2853 bfd_size_type locsymcount; 2854 Elf_Internal_Shdr *symtab_hdr; 2855 asection *srel; 2856 char *local_tls_type; 2857 2858 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 2859 continue; 2860 2861 for (s = ibfd->sections; s != NULL; s = s->next) 2862 { 2863 struct elf_metag_dyn_reloc_entry *hdh_p; 2864 2865 for (hdh_p = ((struct elf_metag_dyn_reloc_entry *) 2866 elf_section_data (s)->local_dynrel); 2867 hdh_p != NULL; 2868 hdh_p = hdh_p->hdh_next) 2869 { 2870 if (!bfd_is_abs_section (hdh_p->sec) 2871 && bfd_is_abs_section (hdh_p->sec->output_section)) 2872 { 2873 /* Input section has been discarded, either because 2874 it is a copy of a linkonce section or due to 2875 linker script /DISCARD/, so we'll be discarding 2876 the relocs too. */ 2877 } 2878 else if (hdh_p->count != 0) 2879 { 2880 srel = elf_section_data (hdh_p->sec)->sreloc; 2881 srel->size += hdh_p->count * sizeof (Elf32_External_Rela); 2882 if ((hdh_p->sec->output_section->flags & SEC_READONLY) != 0) 2883 info->flags |= DF_TEXTREL; 2884 } 2885 } 2886 } 2887 2888 local_got = elf_local_got_refcounts (ibfd); 2889 if (!local_got) 2890 continue; 2891 2892 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 2893 locsymcount = symtab_hdr->sh_info; 2894 end_local_got = local_got + locsymcount; 2895 local_tls_type = metag_elf_local_got_tls_type (ibfd); 2896 s = htab->etab.sgot; 2897 srel = htab->etab.srelgot; 2898 for (; local_got < end_local_got; ++local_got) 2899 { 2900 if (*local_got > 0) 2901 { 2902 *local_got = s->size; 2903 s->size += GOT_ENTRY_SIZE; 2904 /* R_METAG_TLS_GD relocs need 2 consecutive GOT entries. */ 2905 if (*local_tls_type == GOT_TLS_GD) 2906 s->size += 4; 2907 if (bfd_link_pic (info)) 2908 srel->size += sizeof (Elf32_External_Rela); 2909 } 2910 else 2911 *local_got = (bfd_vma) -1; 2912 ++local_tls_type; 2913 } 2914 } 2915 2916 if (htab->tls_ldm_got.refcount > 0) 2917 { 2918 /* Allocate 2 got entries and 1 dynamic reloc for R_METAG_TLS_LDM 2919 reloc. */ 2920 htab->tls_ldm_got.offset = htab->etab.sgot->size; 2921 htab->etab.sgot->size += 8; 2922 htab->etab.srelgot->size += sizeof (Elf32_External_Rela); 2923 } 2924 else 2925 htab->tls_ldm_got.offset = -1; 2926 2927 /* Allocate global sym .plt and .got entries, and space for global 2928 sym dynamic relocs. */ 2929 elf_link_hash_traverse (&htab->etab, allocate_dynrelocs, info); 2930 2931 /* We now have determined the sizes of the various dynamic sections. 2932 Allocate memory for them. */ 2933 relocs = FALSE; 2934 for (s = dynobj->sections; s != NULL; s = s->next) 2935 { 2936 bfd_boolean reloc_section = FALSE; 2937 2938 if ((s->flags & SEC_LINKER_CREATED) == 0) 2939 continue; 2940 2941 if (s == htab->etab.splt 2942 || s == htab->etab.sgot 2943 || s == htab->etab.sgotplt 2944 || s == htab->etab.sdynbss 2945 || s == htab->etab.sdynrelro) 2946 { 2947 /* Strip this section if we don't need it; see the 2948 comment below. */ 2949 } 2950 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 2951 { 2952 if (s->size != 0 && s != htab->etab.srelplt) 2953 relocs = TRUE; 2954 2955 /* We use the reloc_count field as a counter if we need 2956 to copy relocs into the output file. */ 2957 s->reloc_count = 0; 2958 reloc_section = TRUE; 2959 } 2960 else 2961 { 2962 /* It's not one of our sections, so don't allocate space. */ 2963 continue; 2964 } 2965 2966 if (s->size == 0) 2967 { 2968 /* If we don't need this section, strip it from the 2969 output file. This is mostly to handle .rela.bss and 2970 .rela.plt. We must create both sections in 2971 create_dynamic_sections, because they must be created 2972 before the linker maps input sections to output 2973 sections. The linker does that before 2974 adjust_dynamic_symbol is called, and it is that 2975 function which decides whether anything needs to go 2976 into these sections. */ 2977 s->flags |= SEC_EXCLUDE; 2978 continue; 2979 } 2980 2981 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2982 continue; 2983 2984 /* Allocate memory for the section contents. */ 2985 s->contents = bfd_zalloc (dynobj, s->size); 2986 if (s->contents == NULL) 2987 return FALSE; 2988 else if (reloc_section) 2989 { 2990 unsigned char *contents = s->contents; 2991 Elf32_External_Rela reloc; 2992 2993 /* Fill the reloc section with a R_METAG_NONE type reloc. */ 2994 memset(&reloc, 0, sizeof(Elf32_External_Rela)); 2995 reloc.r_info[0] = R_METAG_NONE; 2996 for (; contents < (s->contents + s->size); 2997 contents += sizeof(Elf32_External_Rela)) 2998 { 2999 memcpy(contents, &reloc, sizeof(Elf32_External_Rela)); 3000 } 3001 } 3002 } 3003 3004 if (htab->etab.dynamic_sections_created) 3005 { 3006 /* Add some entries to the .dynamic section. We fill in the 3007 values later, in elf_metag_finish_dynamic_sections, but we 3008 must add the entries now so that we get the correct size for 3009 the .dynamic section. The DT_DEBUG entry is filled in by the 3010 dynamic linker and used by the debugger. */ 3011#define add_dynamic_entry(TAG, VAL) \ 3012 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 3013 3014 if (!add_dynamic_entry (DT_PLTGOT, 0)) 3015 return FALSE; 3016 3017 if (bfd_link_executable (info)) 3018 { 3019 if (!add_dynamic_entry (DT_DEBUG, 0)) 3020 return FALSE; 3021 } 3022 3023 if (htab->etab.srelplt->size != 0) 3024 { 3025 if (!add_dynamic_entry (DT_PLTRELSZ, 0) 3026 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 3027 || !add_dynamic_entry (DT_JMPREL, 0)) 3028 return FALSE; 3029 } 3030 3031 if (relocs) 3032 { 3033 if (!add_dynamic_entry (DT_RELA, 0) 3034 || !add_dynamic_entry (DT_RELASZ, 0) 3035 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 3036 return FALSE; 3037 3038 /* If any dynamic relocs apply to a read-only section, 3039 then we need a DT_TEXTREL entry. */ 3040 if ((info->flags & DF_TEXTREL) == 0) 3041 elf_link_hash_traverse (&htab->etab, readonly_dynrelocs, info); 3042 3043 if ((info->flags & DF_TEXTREL) != 0) 3044 { 3045 if (!add_dynamic_entry (DT_TEXTREL, 0)) 3046 return FALSE; 3047 } 3048 } 3049 } 3050#undef add_dynamic_entry 3051 3052 return TRUE; 3053} 3054 3055/* Finish up dynamic symbol handling. We set the contents of various 3056 dynamic sections here. */ 3057 3058static bfd_boolean 3059elf_metag_finish_dynamic_symbol (bfd *output_bfd, 3060 struct bfd_link_info *info, 3061 struct elf_link_hash_entry *eh, 3062 Elf_Internal_Sym *sym) 3063{ 3064 struct elf_metag_link_hash_table *htab; 3065 Elf_Internal_Rela rel; 3066 bfd_byte *loc; 3067 3068 htab = metag_link_hash_table (info); 3069 3070 if (eh->plt.offset != (bfd_vma) -1) 3071 { 3072 asection *splt; 3073 asection *sgot; 3074 asection *srela; 3075 3076 bfd_vma plt_index; 3077 bfd_vma got_offset; 3078 bfd_vma got_entry; 3079 3080 if (eh->plt.offset & 1) 3081 abort (); 3082 3083 BFD_ASSERT (eh->dynindx != -1); 3084 3085 splt = htab->etab.splt; 3086 sgot = htab->etab.sgotplt; 3087 srela = htab->etab.srelplt; 3088 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 3089 3090 /* Get the index in the procedure linkage table which 3091 corresponds to this symbol. This is the index of this symbol 3092 in all the symbols for which we are making plt entries. The 3093 first entry in the procedure linkage table is reserved. */ 3094 plt_index = eh->plt.offset / PLT_ENTRY_SIZE - 1; 3095 3096 /* Get the offset into the .got.plt table of the entry that 3097 corresponds to this function. */ 3098 got_offset = plt_index * GOT_ENTRY_SIZE; 3099 3100 BFD_ASSERT (got_offset < (1 << 16)); 3101 3102 got_entry = sgot->output_section->vma 3103 + sgot->output_offset 3104 + got_offset; 3105 3106 BFD_ASSERT (plt_index < (1 << 16)); 3107 3108 /* Fill in the entry in the procedure linkage table. */ 3109 if (! bfd_link_pic (info)) 3110 { 3111 bfd_put_32 (output_bfd, 3112 (plt_entry[0] 3113 | (((got_entry >> 16) & 0xffff) << 3)), 3114 splt->contents + eh->plt.offset); 3115 bfd_put_32 (output_bfd, 3116 (plt_entry[1] 3117 | ((got_entry & 0xffff) << 3)), 3118 splt->contents + eh->plt.offset + 4); 3119 bfd_put_32 (output_bfd, plt_entry[2], 3120 splt->contents + eh->plt.offset + 8); 3121 bfd_put_32 (output_bfd, 3122 (plt_entry[3] | (plt_index << 3)), 3123 splt->contents + eh->plt.offset + 12); 3124 bfd_put_32 (output_bfd, 3125 (plt_entry[4] 3126 | ((((unsigned int) ((- (eh->plt.offset + 16)) >> 2)) & 0x7ffff) << 5)), 3127 splt->contents + eh->plt.offset + 16); 3128 } 3129 else 3130 { 3131 bfd_vma addr = got_entry - (splt->output_section->vma + 3132 splt->output_offset + eh->plt.offset); 3133 3134 bfd_put_32 (output_bfd, 3135 plt_pic_entry[0] | (((addr >> 16) & 0xffff) << 3), 3136 splt->contents + eh->plt.offset); 3137 bfd_put_32 (output_bfd, 3138 plt_pic_entry[1] | ((addr & 0xffff) << 3), 3139 splt->contents + eh->plt.offset + 4); 3140 bfd_put_32 (output_bfd, plt_pic_entry[2], 3141 splt->contents + eh->plt.offset + 8); 3142 bfd_put_32 (output_bfd, 3143 (plt_pic_entry[3] | (plt_index << 3)), 3144 splt->contents + eh->plt.offset + 12); 3145 bfd_put_32 (output_bfd, 3146 (plt_pic_entry[4] 3147 + ((((unsigned int) ((- (eh->plt.offset + 16)) >> 2)) & 0x7ffff) << 5)), 3148 splt->contents + eh->plt.offset + 16); 3149 } 3150 3151 /* Fill in the entry in the global offset table. */ 3152 bfd_put_32 (output_bfd, 3153 (splt->output_section->vma 3154 + splt->output_offset 3155 + eh->plt.offset 3156 + 12), /* offset within PLT entry */ 3157 sgot->contents + got_offset); 3158 3159 /* Fill in the entry in the .rela.plt section. */ 3160 rel.r_offset = (sgot->output_section->vma 3161 + sgot->output_offset 3162 + got_offset); 3163 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_JMP_SLOT); 3164 rel.r_addend = 0; 3165 loc = htab->etab.srelplt->contents; 3166 loc += plt_index * sizeof(Elf32_External_Rela); 3167 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc); 3168 3169 if (!eh->def_regular) 3170 { 3171 /* Mark the symbol as undefined, rather than as defined in 3172 the .plt section. Leave the value alone. */ 3173 sym->st_shndx = SHN_UNDEF; 3174 } 3175 } 3176 3177 if (eh->got.offset != (bfd_vma) -1 3178 && (metag_elf_hash_entry (eh)->tls_type & GOT_TLS_GD) == 0 3179 && (metag_elf_hash_entry (eh)->tls_type & GOT_TLS_IE) == 0) 3180 { 3181 /* This symbol has an entry in the global offset table. Set it 3182 up. */ 3183 3184 rel.r_offset = ((eh->got.offset &~ (bfd_vma) 1) 3185 + htab->etab.sgot->output_offset 3186 + htab->etab.sgot->output_section->vma); 3187 3188 /* If this is a -Bsymbolic link and the symbol is defined 3189 locally or was forced to be local because of a version file, 3190 we just want to emit a RELATIVE reloc. The entry in the 3191 global offset table will already have been initialized in the 3192 relocate_section function. */ 3193 if (bfd_link_pic (info) 3194 && (info->symbolic || eh->dynindx == -1) 3195 && eh->def_regular) 3196 { 3197 rel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE); 3198 rel.r_addend = (eh->root.u.def.value 3199 + eh->root.u.def.section->output_offset 3200 + eh->root.u.def.section->output_section->vma); 3201 } 3202 else 3203 { 3204 if ((eh->got.offset & 1) != 0) 3205 abort (); 3206 bfd_put_32 (output_bfd, 0, htab->etab.sgot->contents + eh->got.offset); 3207 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_GLOB_DAT); 3208 rel.r_addend = 0; 3209 } 3210 3211 loc = htab->etab.srelgot->contents; 3212 loc += htab->etab.srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 3213 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc); 3214 } 3215 3216 if (eh->needs_copy) 3217 { 3218 asection *s; 3219 3220 /* This symbol needs a copy reloc. Set it up. */ 3221 3222 if (! (eh->dynindx != -1 3223 && (eh->root.type == bfd_link_hash_defined 3224 || eh->root.type == bfd_link_hash_defweak))) 3225 abort (); 3226 3227 rel.r_offset = (eh->root.u.def.value 3228 + eh->root.u.def.section->output_offset 3229 + eh->root.u.def.section->output_section->vma); 3230 rel.r_addend = 0; 3231 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_COPY); 3232 if (eh->root.u.def.section == htab->etab.sdynrelro) 3233 s = htab->etab.sreldynrelro; 3234 else 3235 s = htab->etab.srelbss; 3236 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 3237 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc); 3238 } 3239 3240 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 3241 if (eh->root.root.string[0] == '_' 3242 && (strcmp (eh->root.root.string, "_DYNAMIC") == 0 3243 || eh == htab->etab.hgot)) 3244 { 3245 sym->st_shndx = SHN_ABS; 3246 } 3247 3248 return TRUE; 3249} 3250 3251/* Set the Meta ELF ABI version. */ 3252 3253static void 3254elf_metag_post_process_headers (bfd * abfd, struct bfd_link_info * link_info) 3255{ 3256 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */ 3257 3258 _bfd_elf_post_process_headers (abfd, link_info); 3259 i_ehdrp = elf_elfheader (abfd); 3260 i_ehdrp->e_ident[EI_ABIVERSION] = METAG_ELF_ABI_VERSION; 3261} 3262 3263/* Used to decide how to sort relocs in an optimal manner for the 3264 dynamic linker, before writing them out. */ 3265 3266static enum elf_reloc_type_class 3267elf_metag_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 3268 const asection *rel_sec ATTRIBUTE_UNUSED, 3269 const Elf_Internal_Rela *rela) 3270{ 3271 switch ((int) ELF32_R_TYPE (rela->r_info)) 3272 { 3273 case R_METAG_RELATIVE: 3274 return reloc_class_relative; 3275 case R_METAG_JMP_SLOT: 3276 return reloc_class_plt; 3277 case R_METAG_COPY: 3278 return reloc_class_copy; 3279 default: 3280 return reloc_class_normal; 3281 } 3282} 3283 3284/* Finish up the dynamic sections. */ 3285 3286static bfd_boolean 3287elf_metag_finish_dynamic_sections (bfd *output_bfd, 3288 struct bfd_link_info *info) 3289{ 3290 bfd *dynobj; 3291 struct elf_metag_link_hash_table *htab; 3292 asection *sdyn; 3293 3294 htab = metag_link_hash_table (info); 3295 dynobj = htab->etab.dynobj; 3296 3297 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 3298 3299 if (htab->etab.dynamic_sections_created) 3300 { 3301 asection *splt; 3302 Elf32_External_Dyn *dyncon, *dynconend; 3303 3304 if (sdyn == NULL) 3305 abort (); 3306 3307 dyncon = (Elf32_External_Dyn *) sdyn->contents; 3308 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 3309 for (; dyncon < dynconend; dyncon++) 3310 { 3311 Elf_Internal_Dyn dyn; 3312 asection *s; 3313 3314 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 3315 3316 switch (dyn.d_tag) 3317 { 3318 default: 3319 continue; 3320 3321 case DT_PLTGOT: 3322 s = htab->etab.sgot; 3323 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3324 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3325 break; 3326 3327 case DT_JMPREL: 3328 s = htab->etab.srelplt; 3329 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3330 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3331 break; 3332 3333 case DT_PLTRELSZ: 3334 s = htab->etab.srelplt; 3335 dyn.d_un.d_val = s->size; 3336 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3337 break; 3338 } 3339 3340 } 3341 3342 /* Fill in the first entry in the procedure linkage table. */ 3343 splt = htab->etab.splt; 3344 if (splt && splt->size > 0) 3345 { 3346 unsigned long addr; 3347 /* addr = .got + 4 */ 3348 addr = (htab->etab.sgot->output_section->vma 3349 + htab->etab.sgot->output_offset + 4); 3350 if (bfd_link_pic (info)) 3351 { 3352 addr -= splt->output_section->vma + splt->output_offset; 3353 bfd_put_32 (output_bfd, 3354 plt0_pic_entry[0] | (((addr >> 16) & 0xffff) << 3), 3355 splt->contents); 3356 bfd_put_32 (output_bfd, 3357 plt0_pic_entry[1] | ((addr & 0xffff) << 3), 3358 splt->contents + 4); 3359 bfd_put_32 (output_bfd, plt0_pic_entry[2], splt->contents + 8); 3360 bfd_put_32 (output_bfd, plt0_pic_entry[3], splt->contents + 12); 3361 bfd_put_32 (output_bfd, plt0_pic_entry[4], splt->contents + 16); 3362 } 3363 else 3364 { 3365 bfd_put_32 (output_bfd, 3366 plt0_entry[0] | (((addr >> 16) & 0xffff) << 3), 3367 splt->contents); 3368 bfd_put_32 (output_bfd, 3369 plt0_entry[1] | ((addr & 0xffff) << 3), 3370 splt->contents + 4); 3371 bfd_put_32 (output_bfd, plt0_entry[2], splt->contents + 8); 3372 bfd_put_32 (output_bfd, plt0_entry[3], splt->contents + 12); 3373 bfd_put_32 (output_bfd, plt0_entry[4], splt->contents + 16); 3374 } 3375 3376 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 3377 PLT_ENTRY_SIZE; 3378 } 3379 } 3380 3381 if (htab->etab.sgot != NULL && htab->etab.sgot->size != 0) 3382 { 3383 /* Fill in the first entry in the global offset table. 3384 We use it to point to our dynamic section, if we have one. */ 3385 bfd_put_32 (output_bfd, 3386 sdyn ? sdyn->output_section->vma + sdyn->output_offset : 0, 3387 htab->etab.sgot->contents); 3388 3389 /* The second entry is reserved for use by the dynamic linker. */ 3390 memset (htab->etab.sgot->contents + GOT_ENTRY_SIZE, 0, GOT_ENTRY_SIZE); 3391 3392 /* Set .got entry size. */ 3393 elf_section_data (htab->etab.sgot->output_section) 3394 ->this_hdr.sh_entsize = GOT_ENTRY_SIZE; 3395 } 3396 3397 return TRUE; 3398} 3399 3400/* Return the section that should be marked against GC for a given 3401 relocation. */ 3402 3403static asection * 3404elf_metag_gc_mark_hook (asection *sec, 3405 struct bfd_link_info *info, 3406 Elf_Internal_Rela *rela, 3407 struct elf_link_hash_entry *hh, 3408 Elf_Internal_Sym *sym) 3409{ 3410 if (hh != NULL) 3411 switch ((unsigned int) ELF32_R_TYPE (rela->r_info)) 3412 { 3413 case R_METAG_GNU_VTINHERIT: 3414 case R_METAG_GNU_VTENTRY: 3415 return NULL; 3416 } 3417 3418 return _bfd_elf_gc_mark_hook (sec, info, rela, hh, sym); 3419} 3420 3421/* Update the got and plt entry reference counts for the section being 3422 removed. */ 3423 3424static bfd_boolean 3425elf_metag_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, 3426 struct bfd_link_info *info ATTRIBUTE_UNUSED, 3427 asection *sec ATTRIBUTE_UNUSED, 3428 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) 3429{ 3430 Elf_Internal_Shdr *symtab_hdr; 3431 struct elf_link_hash_entry **eh_syms; 3432 bfd_signed_vma *local_got_refcounts; 3433 bfd_signed_vma *local_plt_refcounts; 3434 const Elf_Internal_Rela *rel, *relend; 3435 3436 if (bfd_link_relocatable (info)) 3437 return TRUE; 3438 3439 elf_section_data (sec)->local_dynrel = NULL; 3440 3441 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 3442 eh_syms = elf_sym_hashes (abfd); 3443 local_got_refcounts = elf_local_got_refcounts (abfd); 3444 local_plt_refcounts = local_got_refcounts; 3445 if (local_plt_refcounts != NULL) 3446 local_plt_refcounts += symtab_hdr->sh_info; 3447 3448 relend = relocs + sec->reloc_count; 3449 for (rel = relocs; rel < relend; rel++) 3450 { 3451 unsigned long r_symndx; 3452 unsigned int r_type; 3453 struct elf_link_hash_entry *eh = NULL; 3454 3455 r_symndx = ELF32_R_SYM (rel->r_info); 3456 if (r_symndx >= symtab_hdr->sh_info) 3457 { 3458 struct elf_metag_link_hash_entry *hh; 3459 struct elf_metag_dyn_reloc_entry **hdh_pp; 3460 struct elf_metag_dyn_reloc_entry *hdh_p; 3461 3462 eh = eh_syms[r_symndx - symtab_hdr->sh_info]; 3463 while (eh->root.type == bfd_link_hash_indirect 3464 || eh->root.type == bfd_link_hash_warning) 3465 eh = (struct elf_link_hash_entry *) eh->root.u.i.link; 3466 hh = (struct elf_metag_link_hash_entry *) eh; 3467 3468 for (hdh_pp = &hh->dyn_relocs; (hdh_p = *hdh_pp) != NULL; 3469 hdh_pp = &hdh_p->hdh_next) 3470 if (hdh_p->sec == sec) 3471 { 3472 /* Everything must go for SEC. */ 3473 *hdh_pp = hdh_p->hdh_next; 3474 break; 3475 } 3476 } 3477 3478 r_type = ELF32_R_TYPE (rel->r_info); 3479 switch (r_type) 3480 { 3481 case R_METAG_TLS_LDM: 3482 if (metag_link_hash_table (info)->tls_ldm_got.refcount > 0) 3483 metag_link_hash_table (info)->tls_ldm_got.refcount -= 1; 3484 break; 3485 case R_METAG_TLS_IE: 3486 case R_METAG_TLS_GD: 3487 case R_METAG_GETSET_GOT: 3488 if (eh != NULL) 3489 { 3490 if (eh->got.refcount > 0) 3491 eh->got.refcount -= 1; 3492 } 3493 else if (local_got_refcounts != NULL) 3494 { 3495 if (local_got_refcounts[r_symndx] > 0) 3496 local_got_refcounts[r_symndx] -= 1; 3497 } 3498 break; 3499 3500 case R_METAG_RELBRANCH_PLT: 3501 if (eh != NULL) 3502 { 3503 if (eh->plt.refcount > 0) 3504 eh->plt.refcount -= 1; 3505 } 3506 break; 3507 3508 case R_METAG_ADDR32: 3509 case R_METAG_HIADDR16: 3510 case R_METAG_LOADDR16: 3511 case R_METAG_GETSETOFF: 3512 case R_METAG_RELBRANCH: 3513 if (eh != NULL) 3514 { 3515 struct elf_metag_link_hash_entry *hh; 3516 struct elf_metag_dyn_reloc_entry **hdh_pp; 3517 struct elf_metag_dyn_reloc_entry *hdh_p; 3518 3519 if (!bfd_link_pic (info) && eh->plt.refcount > 0) 3520 eh->plt.refcount -= 1; 3521 3522 hh = (struct elf_metag_link_hash_entry *) eh; 3523 3524 for (hdh_pp = &hh->dyn_relocs; (hdh_p = *hdh_pp) != NULL; 3525 hdh_pp = &hdh_p->hdh_next) 3526 if (hdh_p->sec == sec) 3527 { 3528 if (ELF32_R_TYPE (rel->r_info) == R_METAG_RELBRANCH) 3529 hdh_p->relative_count -= 1; 3530 hdh_p->count -= 1; 3531 if (hdh_p->count == 0) 3532 *hdh_pp = hdh_p->hdh_next; 3533 break; 3534 } 3535 } 3536 break; 3537 3538 default: 3539 break; 3540 } 3541 } 3542 3543 return TRUE; 3544} 3545 3546/* Determine the type of stub needed, if any, for a call. */ 3547 3548static enum elf_metag_stub_type 3549metag_type_of_stub (asection *input_sec, 3550 const Elf_Internal_Rela *rel, 3551 struct elf_metag_link_hash_entry *hh, 3552 bfd_vma destination, 3553 struct bfd_link_info *info ATTRIBUTE_UNUSED) 3554{ 3555 bfd_vma location; 3556 bfd_vma branch_offset; 3557 bfd_vma max_branch_offset; 3558 3559 if (hh != NULL && 3560 !(hh->eh.root.type == bfd_link_hash_defined 3561 || hh->eh.root.type == bfd_link_hash_defweak)) 3562 return metag_stub_none; 3563 3564 /* Determine where the call point is. */ 3565 location = (input_sec->output_offset 3566 + input_sec->output_section->vma 3567 + rel->r_offset); 3568 3569 branch_offset = destination - location; 3570 3571 /* Determine if a long branch stub is needed. Meta branch offsets 3572 are signed 19 bits 4 byte aligned. */ 3573 max_branch_offset = (1 << (BRANCH_BITS-1)) << 2; 3574 3575 if (branch_offset + max_branch_offset >= 2*max_branch_offset) 3576 { 3577 if (bfd_link_pic (info)) 3578 return metag_stub_long_branch_shared; 3579 else 3580 return metag_stub_long_branch; 3581 } 3582 3583 return metag_stub_none; 3584} 3585 3586#define MOVT_A0_3 0x82180005 3587#define JUMP_A0_3 0xac180003 3588 3589#define MOVT_A1LBP 0x83080005 3590#define ADD_A1LBP 0x83080000 3591 3592#define ADDT_A0_3_CPC 0x82980001 3593#define ADD_A0_3_A0_3 0x82180000 3594#define MOV_PC_A0_3 0xa3180ca0 3595 3596static bfd_boolean 3597metag_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED) 3598{ 3599 struct elf_metag_stub_hash_entry *hsh; 3600 asection *stub_sec; 3601 bfd *stub_bfd; 3602 bfd_byte *loc; 3603 bfd_vma sym_value; 3604 int size; 3605 3606 /* Massage our args to the form they really have. */ 3607 hsh = (struct elf_metag_stub_hash_entry *) gen_entry; 3608 3609 stub_sec = hsh->stub_sec; 3610 3611 /* Make a note of the offset within the stubs for this entry. */ 3612 hsh->stub_offset = stub_sec->size; 3613 loc = stub_sec->contents + hsh->stub_offset; 3614 3615 stub_bfd = stub_sec->owner; 3616 3617 switch (hsh->stub_type) 3618 { 3619 case metag_stub_long_branch_shared: 3620 /* A PIC long branch stub is an ADDT and an ADD instruction used to 3621 calculate the jump target using A0.3 as a temporary. Then a MOV 3622 to PC carries out the jump. */ 3623 sym_value = (hsh->target_value 3624 + hsh->target_section->output_offset 3625 + hsh->target_section->output_section->vma 3626 + hsh->addend); 3627 3628 sym_value -= (hsh->stub_offset 3629 + stub_sec->output_offset 3630 + stub_sec->output_section->vma); 3631 3632 bfd_put_32 (stub_bfd, ADDT_A0_3_CPC | (((sym_value >> 16) & 0xffff) << 3), 3633 loc); 3634 3635 bfd_put_32 (stub_bfd, ADD_A0_3_A0_3 | ((sym_value & 0xffff) << 3), 3636 loc + 4); 3637 3638 bfd_put_32 (stub_bfd, MOV_PC_A0_3, loc + 8); 3639 3640 size = 12; 3641 break; 3642 case metag_stub_long_branch: 3643 /* A standard long branch stub is a MOVT instruction followed by a 3644 JUMP instruction using the A0.3 register as a temporary. This is 3645 the same method used by the LDLK linker (patch.c). */ 3646 sym_value = (hsh->target_value 3647 + hsh->target_section->output_offset 3648 + hsh->target_section->output_section->vma 3649 + hsh->addend); 3650 3651 bfd_put_32 (stub_bfd, MOVT_A0_3 | (((sym_value >> 16) & 0xffff) << 3), 3652 loc); 3653 3654 bfd_put_32 (stub_bfd, JUMP_A0_3 | ((sym_value & 0xffff) << 3), loc + 4); 3655 3656 size = 8; 3657 break; 3658 default: 3659 BFD_FAIL (); 3660 return FALSE; 3661 } 3662 3663 stub_sec->size += size; 3664 return TRUE; 3665} 3666 3667/* As above, but don't actually build the stub. Just bump offset so 3668 we know stub section sizes. */ 3669 3670static bfd_boolean 3671metag_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED) 3672{ 3673 struct elf_metag_stub_hash_entry *hsh; 3674 int size = 0; 3675 3676 /* Massage our args to the form they really have. */ 3677 hsh = (struct elf_metag_stub_hash_entry *) gen_entry; 3678 3679 if (hsh->stub_type == metag_stub_long_branch) 3680 size = 8; 3681 else if (hsh->stub_type == metag_stub_long_branch_shared) 3682 size = 12; 3683 3684 hsh->stub_sec->size += size; 3685 return TRUE; 3686} 3687 3688/* Set up various things so that we can make a list of input sections 3689 for each output section included in the link. Returns -1 on error, 3690 0 when no stubs will be needed, and 1 on success. */ 3691 3692int 3693elf_metag_setup_section_lists (bfd *output_bfd, struct bfd_link_info *info) 3694{ 3695 bfd *input_bfd; 3696 unsigned int bfd_count; 3697 unsigned int top_id, top_index; 3698 asection *section; 3699 asection **input_list, **list; 3700 bfd_size_type amt; 3701 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info); 3702 3703 /* Count the number of input BFDs and find the top input section id. */ 3704 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; 3705 input_bfd != NULL; 3706 input_bfd = input_bfd->link.next) 3707 { 3708 bfd_count += 1; 3709 for (section = input_bfd->sections; 3710 section != NULL; 3711 section = section->next) 3712 { 3713 if (top_id < section->id) 3714 top_id = section->id; 3715 } 3716 } 3717 3718 htab->bfd_count = bfd_count; 3719 3720 amt = sizeof (struct map_stub) * (top_id + 1); 3721 htab->stub_group = bfd_zmalloc (amt); 3722 if (htab->stub_group == NULL) 3723 return -1; 3724 3725 /* We can't use output_bfd->section_count here to find the top output 3726 section index as some sections may have been removed, and 3727 strip_excluded_output_sections doesn't renumber the indices. */ 3728 for (section = output_bfd->sections, top_index = 0; 3729 section != NULL; 3730 section = section->next) 3731 { 3732 if (top_index < section->index) 3733 top_index = section->index; 3734 } 3735 3736 htab->top_index = top_index; 3737 amt = sizeof (asection *) * (top_index + 1); 3738 input_list = bfd_malloc (amt); 3739 htab->input_list = input_list; 3740 if (input_list == NULL) 3741 return -1; 3742 3743 /* For sections we aren't interested in, mark their entries with a 3744 value we can check later. */ 3745 list = input_list + top_index; 3746 do 3747 *list = bfd_abs_section_ptr; 3748 while (list-- != input_list); 3749 3750 for (section = output_bfd->sections; 3751 section != NULL; 3752 section = section->next) 3753 { 3754 /* FIXME: This is a bit of hack. Currently our .ctors and .dtors 3755 * have PC relative relocs in them but no code flag set. */ 3756 if (((section->flags & SEC_CODE) != 0) || 3757 strcmp(".ctors", section->name) || 3758 strcmp(".dtors", section->name)) 3759 input_list[section->index] = NULL; 3760 } 3761 3762 return 1; 3763} 3764 3765/* The linker repeatedly calls this function for each input section, 3766 in the order that input sections are linked into output sections. 3767 Build lists of input sections to determine groupings between which 3768 we may insert linker stubs. */ 3769 3770void 3771elf_metag_next_input_section (struct bfd_link_info *info, asection *isec) 3772{ 3773 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info); 3774 3775 if (isec->output_section->index <= htab->top_index) 3776 { 3777 asection **list = htab->input_list + isec->output_section->index; 3778 if (*list != bfd_abs_section_ptr) 3779 { 3780 /* Steal the link_sec pointer for our list. */ 3781#define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec) 3782 /* This happens to make the list in reverse order, 3783 which is what we want. */ 3784 PREV_SEC (isec) = *list; 3785 *list = isec; 3786 } 3787 } 3788} 3789 3790/* See whether we can group stub sections together. Grouping stub 3791 sections may result in fewer stubs. More importantly, we need to 3792 put all .init* and .fini* stubs at the beginning of the .init or 3793 .fini output sections respectively, because glibc splits the 3794 _init and _fini functions into multiple parts. Putting a stub in 3795 the middle of a function is not a good idea. */ 3796 3797static void 3798group_sections (struct elf_metag_link_hash_table *htab, 3799 bfd_size_type stub_group_size, 3800 bfd_boolean stubs_always_before_branch) 3801{ 3802 asection **list = htab->input_list + htab->top_index; 3803 do 3804 { 3805 asection *tail = *list; 3806 if (tail == bfd_abs_section_ptr) 3807 continue; 3808 while (tail != NULL) 3809 { 3810 asection *curr; 3811 asection *prev; 3812 bfd_size_type total; 3813 bfd_boolean big_sec; 3814 3815 curr = tail; 3816 total = tail->size; 3817 big_sec = total >= stub_group_size; 3818 3819 while ((prev = PREV_SEC (curr)) != NULL 3820 && ((total += curr->output_offset - prev->output_offset) 3821 < stub_group_size)) 3822 curr = prev; 3823 3824 /* OK, the size from the start of CURR to the end is less 3825 than stub_group_size bytes and thus can be handled by one stub 3826 section. (or the tail section is itself larger than 3827 stub_group_size bytes, in which case we may be toast.) 3828 We should really be keeping track of the total size of 3829 stubs added here, as stubs contribute to the final output 3830 section size. */ 3831 do 3832 { 3833 prev = PREV_SEC (tail); 3834 /* Set up this stub group. */ 3835 htab->stub_group[tail->id].link_sec = curr; 3836 } 3837 while (tail != curr && (tail = prev) != NULL); 3838 3839 /* But wait, there's more! Input sections up to stub_group_size 3840 bytes before the stub section can be handled by it too. 3841 Don't do this if we have a really large section after the 3842 stubs, as adding more stubs increases the chance that 3843 branches may not reach into the stub section. */ 3844 if (!stubs_always_before_branch && !big_sec) 3845 { 3846 total = 0; 3847 while (prev != NULL 3848 && ((total += tail->output_offset - prev->output_offset) 3849 < stub_group_size)) 3850 { 3851 tail = prev; 3852 prev = PREV_SEC (tail); 3853 htab->stub_group[tail->id].link_sec = curr; 3854 } 3855 } 3856 tail = prev; 3857 } 3858 } 3859 while (list-- != htab->input_list); 3860 free (htab->input_list); 3861#undef PREV_SEC 3862} 3863 3864/* Read in all local syms for all input bfds. 3865 Returns -1 on error, 0 otherwise. */ 3866 3867static int 3868get_local_syms (bfd *output_bfd ATTRIBUTE_UNUSED, bfd *input_bfd, 3869 struct bfd_link_info *info) 3870{ 3871 unsigned int bfd_indx; 3872 Elf_Internal_Sym *local_syms, **all_local_syms; 3873 int stub_changed = 0; 3874 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info); 3875 3876 /* We want to read in symbol extension records only once. To do this 3877 we need to read in the local symbols in parallel and save them for 3878 later use; so hold pointers to the local symbols in an array. */ 3879 bfd_size_type amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count; 3880 all_local_syms = bfd_zmalloc (amt); 3881 htab->all_local_syms = all_local_syms; 3882 if (all_local_syms == NULL) 3883 return -1; 3884 3885 /* Walk over all the input BFDs, swapping in local symbols. */ 3886 for (bfd_indx = 0; 3887 input_bfd != NULL; 3888 input_bfd = input_bfd->link.next, bfd_indx++) 3889 { 3890 Elf_Internal_Shdr *symtab_hdr; 3891 3892 /* We'll need the symbol table in a second. */ 3893 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 3894 if (symtab_hdr->sh_info == 0) 3895 continue; 3896 3897 /* We need an array of the local symbols attached to the input bfd. */ 3898 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents; 3899 if (local_syms == NULL) 3900 { 3901 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, 3902 symtab_hdr->sh_info, 0, 3903 NULL, NULL, NULL); 3904 /* Cache them for elf_link_input_bfd. */ 3905 symtab_hdr->contents = (unsigned char *) local_syms; 3906 } 3907 if (local_syms == NULL) 3908 return -1; 3909 3910 all_local_syms[bfd_indx] = local_syms; 3911 } 3912 3913 return stub_changed; 3914} 3915 3916/* Determine and set the size of the stub section for a final link. 3917 3918The basic idea here is to examine all the relocations looking for 3919PC-relative calls to a target that is unreachable with a "CALLR" 3920instruction. */ 3921 3922/* See elf32-hppa.c and elf64-ppc.c. */ 3923 3924bfd_boolean 3925elf_metag_size_stubs(bfd *output_bfd, bfd *stub_bfd, 3926 struct bfd_link_info *info, 3927 bfd_signed_vma group_size, 3928 asection * (*add_stub_section) (const char *, asection *), 3929 void (*layout_sections_again) (void)) 3930{ 3931 bfd_size_type stub_group_size; 3932 bfd_boolean stubs_always_before_branch; 3933 bfd_boolean stub_changed; 3934 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info); 3935 3936 /* Stash our params away. */ 3937 htab->stub_bfd = stub_bfd; 3938 htab->add_stub_section = add_stub_section; 3939 htab->layout_sections_again = layout_sections_again; 3940 stubs_always_before_branch = group_size < 0; 3941 if (group_size < 0) 3942 stub_group_size = -group_size; 3943 else 3944 stub_group_size = group_size; 3945 if (stub_group_size == 1) 3946 { 3947 /* Default values. */ 3948 /* FIXME: not sure what these values should be */ 3949 if (stubs_always_before_branch) 3950 { 3951 stub_group_size = (1 << BRANCH_BITS); 3952 } 3953 else 3954 { 3955 stub_group_size = (1 << BRANCH_BITS); 3956 } 3957 } 3958 3959 group_sections (htab, stub_group_size, stubs_always_before_branch); 3960 3961 switch (get_local_syms (output_bfd, info->input_bfds, info)) 3962 { 3963 default: 3964 if (htab->all_local_syms) 3965 goto error_ret_free_local; 3966 return FALSE; 3967 3968 case 0: 3969 stub_changed = FALSE; 3970 break; 3971 3972 case 1: 3973 stub_changed = TRUE; 3974 break; 3975 } 3976 3977 while (1) 3978 { 3979 bfd *input_bfd; 3980 unsigned int bfd_indx; 3981 asection *stub_sec; 3982 3983 for (input_bfd = info->input_bfds, bfd_indx = 0; 3984 input_bfd != NULL; 3985 input_bfd = input_bfd->link.next, bfd_indx++) 3986 { 3987 Elf_Internal_Shdr *symtab_hdr; 3988 asection *section; 3989 Elf_Internal_Sym *local_syms; 3990 3991 /* We'll need the symbol table in a second. */ 3992 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 3993 if (symtab_hdr->sh_info == 0) 3994 continue; 3995 3996 local_syms = htab->all_local_syms[bfd_indx]; 3997 3998 /* Walk over each section attached to the input bfd. */ 3999 for (section = input_bfd->sections; 4000 section != NULL; 4001 section = section->next) 4002 { 4003 Elf_Internal_Rela *internal_relocs, *irelaend, *irela; 4004 4005 /* If there aren't any relocs, then there's nothing more 4006 to do. */ 4007 if ((section->flags & SEC_RELOC) == 0 4008 || section->reloc_count == 0) 4009 continue; 4010 4011 /* If this section is a link-once section that will be 4012 discarded, then don't create any stubs. */ 4013 if (section->output_section == NULL 4014 || section->output_section->owner != output_bfd) 4015 continue; 4016 4017 /* Get the relocs. */ 4018 internal_relocs 4019 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, 4020 info->keep_memory); 4021 if (internal_relocs == NULL) 4022 goto error_ret_free_local; 4023 4024 /* Now examine each relocation. */ 4025 irela = internal_relocs; 4026 irelaend = irela + section->reloc_count; 4027 for (; irela < irelaend; irela++) 4028 { 4029 unsigned int r_type, r_indx; 4030 enum elf_metag_stub_type stub_type; 4031 struct elf_metag_stub_hash_entry *hsh; 4032 asection *sym_sec; 4033 bfd_vma sym_value; 4034 bfd_vma destination; 4035 struct elf_metag_link_hash_entry *hh; 4036 char *stub_name; 4037 const asection *id_sec; 4038 4039 r_type = ELF32_R_TYPE (irela->r_info); 4040 r_indx = ELF32_R_SYM (irela->r_info); 4041 4042 if (r_type >= (unsigned int) R_METAG_MAX) 4043 { 4044 bfd_set_error (bfd_error_bad_value); 4045 error_ret_free_internal: 4046 if (elf_section_data (section)->relocs == NULL) 4047 free (internal_relocs); 4048 goto error_ret_free_local; 4049 } 4050 4051 /* Only look for stubs on CALLR and B instructions. */ 4052 if (!(r_type == (unsigned int) R_METAG_RELBRANCH || 4053 r_type == (unsigned int) R_METAG_RELBRANCH_PLT)) 4054 continue; 4055 4056 /* Now determine the call target, its name, value, 4057 section. */ 4058 sym_sec = NULL; 4059 sym_value = 0; 4060 destination = 0; 4061 hh = NULL; 4062 if (r_indx < symtab_hdr->sh_info) 4063 { 4064 /* It's a local symbol. */ 4065 Elf_Internal_Sym *sym; 4066 Elf_Internal_Shdr *hdr; 4067 unsigned int shndx; 4068 4069 sym = local_syms + r_indx; 4070 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) 4071 sym_value = sym->st_value; 4072 shndx = sym->st_shndx; 4073 if (shndx < elf_numsections (input_bfd)) 4074 { 4075 hdr = elf_elfsections (input_bfd)[shndx]; 4076 sym_sec = hdr->bfd_section; 4077 destination = (sym_value + irela->r_addend 4078 + sym_sec->output_offset 4079 + sym_sec->output_section->vma); 4080 } 4081 } 4082 else 4083 { 4084 /* It's an external symbol. */ 4085 int e_indx; 4086 4087 e_indx = r_indx - symtab_hdr->sh_info; 4088 hh = ((struct elf_metag_link_hash_entry *) 4089 elf_sym_hashes (input_bfd)[e_indx]); 4090 4091 while (hh->eh.root.type == bfd_link_hash_indirect 4092 || hh->eh.root.type == bfd_link_hash_warning) 4093 hh = ((struct elf_metag_link_hash_entry *) 4094 hh->eh.root.u.i.link); 4095 4096 if (hh->eh.root.type == bfd_link_hash_defined 4097 || hh->eh.root.type == bfd_link_hash_defweak) 4098 { 4099 sym_sec = hh->eh.root.u.def.section; 4100 sym_value = hh->eh.root.u.def.value; 4101 if (hh->eh.plt.offset != (bfd_vma) -1 4102 && hh->eh.dynindx != -1 4103 && r_type == (unsigned int) R_METAG_RELBRANCH_PLT) 4104 { 4105 sym_sec = htab->etab.splt; 4106 sym_value = hh->eh.plt.offset; 4107 } 4108 4109 if (sym_sec->output_section != NULL) 4110 destination = (sym_value + irela->r_addend 4111 + sym_sec->output_offset 4112 + sym_sec->output_section->vma); 4113 else 4114 continue; 4115 } 4116 else if (hh->eh.root.type == bfd_link_hash_undefweak) 4117 { 4118 if (! bfd_link_pic (info)) 4119 continue; 4120 } 4121 else if (hh->eh.root.type == bfd_link_hash_undefined) 4122 { 4123 if (! (info->unresolved_syms_in_objects == RM_IGNORE 4124 && (ELF_ST_VISIBILITY (hh->eh.other) 4125 == STV_DEFAULT))) 4126 continue; 4127 } 4128 else 4129 { 4130 bfd_set_error (bfd_error_bad_value); 4131 goto error_ret_free_internal; 4132 } 4133 } 4134 4135 /* Determine what (if any) linker stub is needed. */ 4136 stub_type = metag_type_of_stub (section, irela, hh, 4137 destination, info); 4138 if (stub_type == metag_stub_none) 4139 continue; 4140 4141 /* Support for grouping stub sections. */ 4142 id_sec = htab->stub_group[section->id].link_sec; 4143 4144 /* Get the name of this stub. */ 4145 stub_name = metag_stub_name (id_sec, sym_sec, hh, irela); 4146 if (!stub_name) 4147 goto error_ret_free_internal; 4148 4149 hsh = metag_stub_hash_lookup (&htab->bstab, 4150 stub_name, 4151 FALSE, FALSE); 4152 if (hsh != NULL) 4153 { 4154 /* The proper stub has already been created. */ 4155 free (stub_name); 4156 continue; 4157 } 4158 4159 hsh = metag_add_stub (stub_name, section, htab); 4160 if (hsh == NULL) 4161 { 4162 free (stub_name); 4163 goto error_ret_free_internal; 4164 } 4165 hsh->target_value = sym_value; 4166 hsh->target_section = sym_sec; 4167 hsh->stub_type = stub_type; 4168 hsh->hh = hh; 4169 hsh->addend = irela->r_addend; 4170 stub_changed = TRUE; 4171 } 4172 4173 /* We're done with the internal relocs, free them. */ 4174 if (elf_section_data (section)->relocs == NULL) 4175 free (internal_relocs); 4176 } 4177 } 4178 4179 if (!stub_changed) 4180 break; 4181 4182 /* OK, we've added some stubs. Find out the new size of the 4183 stub sections. */ 4184 for (stub_sec = htab->stub_bfd->sections; 4185 stub_sec != NULL; 4186 stub_sec = stub_sec->next) 4187 stub_sec->size = 0; 4188 4189 bfd_hash_traverse (&htab->bstab, metag_size_one_stub, htab); 4190 4191 /* Ask the linker to do its stuff. */ 4192 (*htab->layout_sections_again) (); 4193 stub_changed = FALSE; 4194 } 4195 4196 free (htab->all_local_syms); 4197 return TRUE; 4198 4199 error_ret_free_local: 4200 free (htab->all_local_syms); 4201 return FALSE; 4202} 4203 4204/* Build all the stubs associated with the current output file. The 4205 stubs are kept in a hash table attached to the main linker hash 4206 table. This function is called via metagelf_finish in the linker. */ 4207 4208bfd_boolean 4209elf_metag_build_stubs (struct bfd_link_info *info) 4210{ 4211 asection *stub_sec; 4212 struct bfd_hash_table *table; 4213 struct elf_metag_link_hash_table *htab; 4214 4215 htab = metag_link_hash_table (info); 4216 4217 for (stub_sec = htab->stub_bfd->sections; 4218 stub_sec != NULL; 4219 stub_sec = stub_sec->next) 4220 { 4221 bfd_size_type size; 4222 4223 /* Allocate memory to hold the linker stubs. */ 4224 size = stub_sec->size; 4225 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size); 4226 if (stub_sec->contents == NULL && size != 0) 4227 return FALSE; 4228 stub_sec->size = 0; 4229 } 4230 4231 /* Build the stubs as directed by the stub hash table. */ 4232 table = &htab->bstab; 4233 bfd_hash_traverse (table, metag_build_one_stub, info); 4234 4235 return TRUE; 4236} 4237 4238/* Return TRUE if SYM represents a local label symbol. */ 4239 4240static bfd_boolean 4241elf_metag_is_local_label_name (bfd *abfd ATTRIBUTE_UNUSED, const char *name) 4242{ 4243 if (name[0] == '$' && name[1] == 'L') 4244 return 1; 4245 return _bfd_elf_is_local_label_name (abfd, name); 4246} 4247 4248/* Return address for Ith PLT stub in section PLT, for relocation REL 4249 or (bfd_vma) -1 if it should not be included. */ 4250 4251static bfd_vma 4252elf_metag_plt_sym_val (bfd_vma i, const asection *plt, 4253 const arelent *rel ATTRIBUTE_UNUSED) 4254{ 4255 return plt->vma + (i + 1) * PLT_ENTRY_SIZE; 4256} 4257 4258#define ELF_ARCH bfd_arch_metag 4259#define ELF_TARGET_ID METAG_ELF_DATA 4260#define ELF_MACHINE_CODE EM_METAG 4261#define ELF_MINPAGESIZE 0x1000 4262#define ELF_MAXPAGESIZE 0x4000 4263#define ELF_COMMONPAGESIZE 0x1000 4264 4265#define TARGET_LITTLE_SYM metag_elf32_vec 4266#define TARGET_LITTLE_NAME "elf32-metag" 4267 4268#define elf_symbol_leading_char '_' 4269 4270#define elf_info_to_howto_rel NULL 4271#define elf_info_to_howto metag_info_to_howto_rela 4272 4273#define bfd_elf32_bfd_is_local_label_name elf_metag_is_local_label_name 4274#define bfd_elf32_bfd_link_hash_table_create \ 4275 elf_metag_link_hash_table_create 4276#define elf_backend_relocate_section elf_metag_relocate_section 4277#define elf_backend_gc_mark_hook elf_metag_gc_mark_hook 4278#define elf_backend_gc_sweep_hook elf_metag_gc_sweep_hook 4279#define elf_backend_check_relocs elf_metag_check_relocs 4280#define elf_backend_create_dynamic_sections elf_metag_create_dynamic_sections 4281#define elf_backend_adjust_dynamic_symbol elf_metag_adjust_dynamic_symbol 4282#define elf_backend_finish_dynamic_symbol elf_metag_finish_dynamic_symbol 4283#define elf_backend_finish_dynamic_sections elf_metag_finish_dynamic_sections 4284#define elf_backend_size_dynamic_sections elf_metag_size_dynamic_sections 4285#define elf_backend_omit_section_dynsym \ 4286 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 4287#define elf_backend_post_process_headers elf_metag_post_process_headers 4288#define elf_backend_reloc_type_class elf_metag_reloc_type_class 4289#define elf_backend_copy_indirect_symbol elf_metag_copy_indirect_symbol 4290#define elf_backend_plt_sym_val elf_metag_plt_sym_val 4291 4292#define elf_backend_can_gc_sections 1 4293#define elf_backend_can_refcount 1 4294#define elf_backend_rela_normal 1 4295#define elf_backend_want_got_plt 1 4296#define elf_backend_want_got_sym 0 4297#define elf_backend_want_plt_sym 0 4298#define elf_backend_plt_readonly 1 4299#define elf_backend_dtrel_excludes_plt 1 4300#define elf_backend_want_dynrelro 1 4301 4302#define bfd_elf32_bfd_reloc_type_lookup metag_reloc_type_lookup 4303#define bfd_elf32_bfd_reloc_name_lookup metag_reloc_name_lookup 4304 4305#include "elf32-target.h" 4306