1 /* Meta support for 32-bit ELF 2 Copyright (C) 2013-2016 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 37 static 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 46 static 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 55 static 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 64 static 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 95 static 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 695 696 struct metag_reloc_map 697 { 698 bfd_reloc_code_real_type bfd_reloc_val; 699 unsigned int metag_reloc_val; 700 }; 701 702 static 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 }; 745 746 enum elf_metag_stub_type 747 { 748 metag_stub_long_branch, 749 metag_stub_long_branch_shared, 750 metag_stub_none 751 }; 752 753 struct 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 }; 781 782 struct 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 }; 812 813 struct 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 /* Short-cuts to get to dynamic linker sections. */ 846 asection *sgot; 847 asection *sgotplt; 848 asection *srelgot; 849 asection *splt; 850 asection *srelplt; 851 asection *sdynbss; 852 asection *srelbss; 853 854 /* Small local sym cache. */ 855 struct sym_cache sym_cache; 856 857 /* Data for LDM relocations. */ 858 union 859 { 860 bfd_signed_vma refcount; 861 bfd_vma offset; 862 } tls_ldm_got; 863 }; 864 865 /* Return the base vma address which should be subtracted from the 866 real address when resolving a dtpoff relocation. This is PT_TLS 867 segment p_vaddr. */ 868 static bfd_vma 869 dtpoff_base (struct bfd_link_info *info) 870 { 871 /* If tls_sec is NULL, we should have signalled an error already. */ 872 if (elf_hash_table (info)->tls_sec == NULL) 873 return 0; 874 return elf_hash_table (info)->tls_sec->vma; 875 } 876 877 /* Return the relocation value for R_METAG_TLS_IE */ 878 static bfd_vma 879 tpoff (struct bfd_link_info *info, bfd_vma address) 880 { 881 /* If tls_sec is NULL, we should have signalled an error already. */ 882 if (elf_hash_table (info)->tls_sec == NULL) 883 return 0; 884 /* METAG TLS ABI is variant I and static TLS blocks start just after 885 tcbhead structure which has 2 pointer fields. */ 886 return (address - elf_hash_table (info)->tls_sec->vma 887 + align_power ((bfd_vma) 8, 888 elf_hash_table (info)->tls_sec->alignment_power)); 889 } 890 891 static void 892 metag_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, 893 arelent *cache_ptr, 894 Elf_Internal_Rela *dst) 895 { 896 unsigned int r_type; 897 898 r_type = ELF32_R_TYPE (dst->r_info); 899 if (r_type >= (unsigned int) R_METAG_MAX) 900 { 901 _bfd_error_handler (_("%B: invalid METAG reloc number: %d"), abfd, r_type); 902 r_type = 0; 903 } 904 cache_ptr->howto = & elf_metag_howto_table [r_type]; 905 } 906 907 static reloc_howto_type * 908 metag_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, 909 bfd_reloc_code_real_type code) 910 { 911 unsigned int i; 912 913 for (i = 0; i < sizeof (metag_reloc_map) / sizeof (metag_reloc_map[0]); i++) 914 if (metag_reloc_map [i].bfd_reloc_val == code) 915 return & elf_metag_howto_table [metag_reloc_map[i].metag_reloc_val]; 916 917 return NULL; 918 } 919 920 static reloc_howto_type * 921 metag_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 922 const char *r_name) 923 { 924 unsigned int i; 925 926 for (i = 0; i < sizeof (elf_metag_howto_table) / sizeof (elf_metag_howto_table[0]); i++) 927 if (elf_metag_howto_table[i].name != NULL 928 && strcasecmp (elf_metag_howto_table[i].name, r_name) == 0) 929 return &elf_metag_howto_table[i]; 930 931 return NULL; 932 } 933 934 /* Various hash macros and functions. */ 935 #define metag_link_hash_table(p) \ 936 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 937 == METAG_ELF_DATA ? ((struct elf_metag_link_hash_table *) ((p)->hash)) : NULL) 938 939 #define metag_elf_hash_entry(ent) \ 940 ((struct elf_metag_link_hash_entry *)(ent)) 941 942 #define metag_stub_hash_entry(ent) \ 943 ((struct elf_metag_stub_hash_entry *)(ent)) 944 945 #define metag_stub_hash_lookup(table, string, create, copy) \ 946 ((struct elf_metag_stub_hash_entry *) \ 947 bfd_hash_lookup ((table), (string), (create), (copy))) 948 949 #define metag_elf_local_got_tls_type(abfd) \ 950 ((char *)(elf_local_got_offsets (abfd) + (elf_tdata (abfd)->symtab_hdr.sh_info))) 951 952 /* Assorted hash table functions. */ 953 954 /* Initialize an entry in the stub hash table. */ 955 956 static struct bfd_hash_entry * 957 stub_hash_newfunc (struct bfd_hash_entry *entry, 958 struct bfd_hash_table *table, 959 const char *string) 960 { 961 /* Allocate the structure if it has not already been allocated by a 962 subclass. */ 963 if (entry == NULL) 964 { 965 entry = bfd_hash_allocate (table, 966 sizeof (struct elf_metag_stub_hash_entry)); 967 if (entry == NULL) 968 return entry; 969 } 970 971 /* Call the allocation method of the superclass. */ 972 entry = bfd_hash_newfunc (entry, table, string); 973 if (entry != NULL) 974 { 975 struct elf_metag_stub_hash_entry *hsh; 976 977 /* Initialize the local fields. */ 978 hsh = (struct elf_metag_stub_hash_entry *) entry; 979 hsh->stub_sec = NULL; 980 hsh->stub_offset = 0; 981 hsh->target_value = 0; 982 hsh->target_section = NULL; 983 hsh->stub_type = metag_stub_long_branch; 984 hsh->hh = NULL; 985 hsh->id_sec = NULL; 986 } 987 988 return entry; 989 } 990 991 /* Initialize an entry in the link hash table. */ 992 993 static struct bfd_hash_entry * 994 metag_link_hash_newfunc (struct bfd_hash_entry *entry, 995 struct bfd_hash_table *table, 996 const char *string) 997 { 998 /* Allocate the structure if it has not already been allocated by a 999 subclass. */ 1000 if (entry == NULL) 1001 { 1002 entry = bfd_hash_allocate (table, 1003 sizeof (struct elf_metag_link_hash_entry)); 1004 if (entry == NULL) 1005 return entry; 1006 } 1007 1008 /* Call the allocation method of the superclass. */ 1009 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 1010 if (entry != NULL) 1011 { 1012 struct elf_metag_link_hash_entry *hh; 1013 1014 /* Initialize the local fields. */ 1015 hh = (struct elf_metag_link_hash_entry *) entry; 1016 hh->hsh_cache = NULL; 1017 hh->dyn_relocs = NULL; 1018 hh->tls_type = GOT_UNKNOWN; 1019 } 1020 1021 return entry; 1022 } 1023 1024 /* Free the derived linker hash table. */ 1025 1026 static void 1027 elf_metag_link_hash_table_free (bfd *obfd) 1028 { 1029 struct elf_metag_link_hash_table *htab 1030 = (struct elf_metag_link_hash_table *) obfd->link.hash; 1031 1032 bfd_hash_table_free (&htab->bstab); 1033 _bfd_elf_link_hash_table_free (obfd); 1034 } 1035 1036 /* Create the derived linker hash table. The Meta ELF port uses the derived 1037 hash table to keep information specific to the Meta ELF linker (without 1038 using static variables). */ 1039 1040 static struct bfd_link_hash_table * 1041 elf_metag_link_hash_table_create (bfd *abfd) 1042 { 1043 struct elf_metag_link_hash_table *htab; 1044 bfd_size_type amt = sizeof (*htab); 1045 1046 htab = bfd_zmalloc (amt); 1047 if (htab == NULL) 1048 return NULL; 1049 1050 if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd, 1051 metag_link_hash_newfunc, 1052 sizeof (struct elf_metag_link_hash_entry), 1053 METAG_ELF_DATA)) 1054 { 1055 free (htab); 1056 return NULL; 1057 } 1058 1059 /* Init the stub hash table too. */ 1060 if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc, 1061 sizeof (struct elf_metag_stub_hash_entry))) 1062 { 1063 _bfd_elf_link_hash_table_free (abfd); 1064 return NULL; 1065 } 1066 htab->etab.root.hash_table_free = elf_metag_link_hash_table_free; 1067 1068 return &htab->etab.root; 1069 } 1070 1071 /* Section name for stubs is the associated section name plus this 1072 string. */ 1073 #define STUB_SUFFIX ".stub" 1074 1075 /* Build a name for an entry in the stub hash table. */ 1076 1077 static char * 1078 metag_stub_name (const asection *input_section, 1079 const asection *sym_sec, 1080 const struct elf_metag_link_hash_entry *hh, 1081 const Elf_Internal_Rela *rel) 1082 { 1083 char *stub_name; 1084 bfd_size_type len; 1085 1086 if (hh) 1087 { 1088 len = 8 + 1 + strlen (hh->eh.root.root.string) + 1 + 8 + 1; 1089 stub_name = bfd_malloc (len); 1090 if (stub_name != NULL) 1091 { 1092 sprintf (stub_name, "%08x_%s+%x", 1093 input_section->id & 0xffffffff, 1094 hh->eh.root.root.string, 1095 (int) rel->r_addend & 0xffffffff); 1096 } 1097 } 1098 else 1099 { 1100 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1; 1101 stub_name = bfd_malloc (len); 1102 if (stub_name != NULL) 1103 { 1104 sprintf (stub_name, "%08x_%x:%x+%x", 1105 input_section->id & 0xffffffff, 1106 sym_sec->id & 0xffffffff, 1107 (int) ELF32_R_SYM (rel->r_info) & 0xffffffff, 1108 (int) rel->r_addend & 0xffffffff); 1109 } 1110 } 1111 return stub_name; 1112 } 1113 1114 /* Look up an entry in the stub hash. Stub entries are cached because 1115 creating the stub name takes a bit of time. */ 1116 1117 static struct elf_metag_stub_hash_entry * 1118 metag_get_stub_entry (const asection *input_section, 1119 const asection *sym_sec, 1120 struct elf_metag_link_hash_entry *hh, 1121 const Elf_Internal_Rela *rel, 1122 struct elf_metag_link_hash_table *htab) 1123 { 1124 struct elf_metag_stub_hash_entry *hsh; 1125 const asection *id_sec; 1126 1127 /* If this input section is part of a group of sections sharing one 1128 stub section, then use the id of the first section in the group. 1129 Stub names need to include a section id, as there may well be 1130 more than one stub used to reach say, printf, and we need to 1131 distinguish between them. */ 1132 id_sec = htab->stub_group[input_section->id].link_sec; 1133 1134 if (hh != NULL && hh->hsh_cache != NULL 1135 && hh->hsh_cache->hh == hh 1136 && hh->hsh_cache->id_sec == id_sec) 1137 { 1138 hsh = hh->hsh_cache; 1139 } 1140 else 1141 { 1142 char *stub_name; 1143 1144 stub_name = metag_stub_name (id_sec, sym_sec, hh, rel); 1145 if (stub_name == NULL) 1146 return NULL; 1147 1148 hsh = metag_stub_hash_lookup (&htab->bstab, 1149 stub_name, FALSE, FALSE); 1150 1151 if (hh != NULL) 1152 hh->hsh_cache = hsh; 1153 1154 free (stub_name); 1155 } 1156 1157 return hsh; 1158 } 1159 1160 /* Add a new stub entry to the stub hash. Not all fields of the new 1161 stub entry are initialised. */ 1162 1163 static struct elf_metag_stub_hash_entry * 1164 metag_add_stub (const char *stub_name, 1165 asection *section, 1166 struct elf_metag_link_hash_table *htab) 1167 { 1168 asection *link_sec; 1169 asection *stub_sec; 1170 struct elf_metag_stub_hash_entry *hsh; 1171 1172 link_sec = htab->stub_group[section->id].link_sec; 1173 stub_sec = htab->stub_group[section->id].stub_sec; 1174 if (stub_sec == NULL) 1175 { 1176 stub_sec = htab->stub_group[link_sec->id].stub_sec; 1177 if (stub_sec == NULL) 1178 { 1179 size_t namelen; 1180 bfd_size_type len; 1181 char *s_name; 1182 1183 namelen = strlen (link_sec->name); 1184 len = namelen + sizeof (STUB_SUFFIX); 1185 s_name = bfd_alloc (htab->stub_bfd, len); 1186 if (s_name == NULL) 1187 return NULL; 1188 1189 memcpy (s_name, link_sec->name, namelen); 1190 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX)); 1191 1192 stub_sec = (*htab->add_stub_section) (s_name, link_sec); 1193 if (stub_sec == NULL) 1194 return NULL; 1195 htab->stub_group[link_sec->id].stub_sec = stub_sec; 1196 } 1197 htab->stub_group[section->id].stub_sec = stub_sec; 1198 } 1199 1200 /* Enter this entry into the linker stub hash table. */ 1201 hsh = metag_stub_hash_lookup (&htab->bstab, stub_name, 1202 TRUE, FALSE); 1203 if (hsh == NULL) 1204 { 1205 (*_bfd_error_handler) (_("%B: cannot create stub entry %s"), 1206 section->owner, 1207 stub_name); 1208 return NULL; 1209 } 1210 1211 hsh->stub_sec = stub_sec; 1212 hsh->stub_offset = 0; 1213 hsh->id_sec = link_sec; 1214 return hsh; 1215 } 1216 1217 /* Check a signed integer value can be represented in the given number 1218 of bits. */ 1219 1220 static bfd_boolean 1221 within_signed_range (int value, unsigned int bits) 1222 { 1223 int min_val = -(1 << (bits - 1)); 1224 int max_val = (1 << (bits - 1)) - 1; 1225 return (value <= max_val) && (value >= min_val); 1226 } 1227 1228 /* Perform a relocation as part of a final link. */ 1229 1230 static bfd_reloc_status_type 1231 metag_final_link_relocate (reloc_howto_type *howto, 1232 bfd *input_bfd, 1233 asection *input_section, 1234 bfd_byte *contents, 1235 Elf_Internal_Rela *rel, 1236 bfd_vma relocation, 1237 struct elf_metag_link_hash_entry *hh, 1238 struct elf_metag_link_hash_table *htab, 1239 asection *sym_sec) 1240 { 1241 bfd_reloc_status_type r = bfd_reloc_ok; 1242 bfd_byte *hit_data = contents + rel->r_offset; 1243 int opcode, op_shift, op_extended, l1, l2; 1244 bfd_signed_vma srel, addend = rel->r_addend; 1245 struct elf_metag_stub_hash_entry *hsh = NULL; 1246 bfd_vma location; 1247 1248 /* Find out where we are and where we're going. */ 1249 location = (rel->r_offset + 1250 input_section->output_offset + 1251 input_section->output_section->vma); 1252 1253 switch (howto->type) 1254 { 1255 case R_METAG_RELBRANCH: 1256 case R_METAG_RELBRANCH_PLT: 1257 /* Make it a pc relative offset. */ 1258 relocation -= location; 1259 break; 1260 case R_METAG_TLS_GD: 1261 case R_METAG_TLS_IE: 1262 relocation -= elf_gp (input_section->output_section->owner); 1263 break; 1264 default: 1265 break; 1266 } 1267 1268 switch (howto->type) 1269 { 1270 case R_METAG_RELBRANCH_PLT: 1271 case R_METAG_RELBRANCH: 1272 opcode = bfd_get_32 (input_bfd, hit_data); 1273 1274 srel = (bfd_signed_vma) relocation; 1275 srel += addend; 1276 1277 /* If the branch is out of reach, then redirect the 1278 call to the local stub for this function. */ 1279 if (srel > ((1 << (BRANCH_BITS + 1)) - 1) || 1280 (srel < - (1 << (BRANCH_BITS + 1)))) 1281 { 1282 if (sym_sec == NULL) 1283 break; 1284 1285 hsh = metag_get_stub_entry (input_section, sym_sec, 1286 hh, rel, htab); 1287 if (hsh == NULL) 1288 return bfd_reloc_undefined; 1289 1290 /* Munge up the value and addend so that we call the stub 1291 rather than the procedure directly. */ 1292 srel = (hsh->stub_offset 1293 + hsh->stub_sec->output_offset 1294 + hsh->stub_sec->output_section->vma); 1295 srel -= location; 1296 } 1297 1298 srel = srel >> 2; 1299 1300 if (!within_signed_range (srel, BRANCH_BITS)) 1301 { 1302 if (hh && hh->eh.root.type == bfd_link_hash_undefweak) 1303 srel = 0; 1304 else 1305 return bfd_reloc_overflow; 1306 } 1307 1308 opcode &= ~(0x7ffff << 5); 1309 opcode |= ((srel & 0x7ffff) << 5); 1310 1311 bfd_put_32 (input_bfd, opcode, hit_data); 1312 break; 1313 case R_METAG_GETSETOFF: 1314 case R_METAG_GETSET_GOT: 1315 case R_METAG_GETSET_GOTOFF: 1316 opcode = bfd_get_32 (input_bfd, hit_data); 1317 1318 srel = (bfd_signed_vma) relocation; 1319 srel += addend; 1320 1321 /* Is this a standard or extended GET/SET? */ 1322 if ((opcode & 0xf0000000) == 0xa0000000) 1323 { 1324 /* Extended GET/SET. */ 1325 l1 = opcode & 0x2; 1326 l2 = opcode & 0x4; 1327 op_extended = 1; 1328 } 1329 else 1330 { 1331 /* Standard GET/SET. */ 1332 l1 = opcode & 0x01000000; 1333 l2 = opcode & 0x04000000; 1334 op_extended = 0; 1335 } 1336 1337 /* Calculate the width of the GET/SET and how much we need to 1338 shift the result by. */ 1339 if (l2) 1340 if (l1) 1341 op_shift = 3; 1342 else 1343 op_shift = 2; 1344 else 1345 if (l1) 1346 op_shift = 1; 1347 else 1348 op_shift = 0; 1349 1350 /* GET/SET offsets are scaled by the width of the transfer. */ 1351 srel = srel >> op_shift; 1352 1353 /* Extended GET/SET has signed 12 bits of offset, standard has 1354 signed 6 bits. */ 1355 if (op_extended) 1356 { 1357 if (!within_signed_range (srel, 12)) 1358 { 1359 if (hh && hh->eh.root.type == bfd_link_hash_undefweak) 1360 srel = 0; 1361 else 1362 return bfd_reloc_overflow; 1363 } 1364 opcode &= ~(0xfff << 7); 1365 opcode |= ((srel & 0xfff) << 7); 1366 } 1367 else 1368 { 1369 if (!within_signed_range (srel, 5)) 1370 { 1371 if (hh && hh->eh.root.type == bfd_link_hash_undefweak) 1372 srel = 0; 1373 else 1374 return bfd_reloc_overflow; 1375 } 1376 opcode &= ~(0x3f << 8); 1377 opcode |= ((srel & 0x3f) << 8); 1378 } 1379 1380 bfd_put_32 (input_bfd, opcode, hit_data); 1381 break; 1382 case R_METAG_TLS_GD: 1383 case R_METAG_TLS_LDM: 1384 opcode = bfd_get_32 (input_bfd, hit_data); 1385 1386 if ((bfd_signed_vma)relocation < 0) 1387 { 1388 /* sign extend immediate */ 1389 if ((opcode & 0xf2000001) == 0x02000000) 1390 { 1391 /* ADD De.e,Dx.r,#I16 */ 1392 /* set SE bit */ 1393 opcode |= (1 << 1); 1394 } else 1395 return bfd_reloc_overflow; 1396 } 1397 1398 bfd_put_32 (input_bfd, opcode, hit_data); 1399 1400 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1401 contents, rel->r_offset, 1402 relocation, rel->r_addend); 1403 break; 1404 default: 1405 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1406 contents, rel->r_offset, 1407 relocation, rel->r_addend); 1408 } 1409 1410 return r; 1411 } 1412 1413 /* This is defined because R_METAG_NONE != 0... 1414 See RELOC_AGAINST_DISCARDED_SECTION for details. */ 1415 #define METAG_RELOC_AGAINST_DISCARDED_SECTION(info, input_bfd, input_section, \ 1416 rel, relend, howto, contents) \ 1417 { \ 1418 _bfd_clear_contents (howto, input_bfd, input_section, \ 1419 contents + rel->r_offset); \ 1420 \ 1421 if (bfd_link_relocatable (info) \ 1422 && (input_section->flags & SEC_DEBUGGING)) \ 1423 { \ 1424 /* Only remove relocations in debug sections since other \ 1425 sections may require relocations. */ \ 1426 Elf_Internal_Shdr *rel_hdr; \ 1427 \ 1428 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); \ 1429 \ 1430 /* Avoid empty output section. */ \ 1431 if (rel_hdr->sh_size > rel_hdr->sh_entsize) \ 1432 { \ 1433 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 1434 rel_hdr = _bfd_elf_single_rel_hdr (input_section); \ 1435 rel_hdr->sh_size -= rel_hdr->sh_entsize; \ 1436 \ 1437 memmove (rel, rel + 1, (relend - rel) * sizeof (*rel)); \ 1438 \ 1439 input_section->reloc_count--; \ 1440 relend--; \ 1441 rel--; \ 1442 continue; \ 1443 } \ 1444 } \ 1445 \ 1446 rel->r_info = R_METAG_NONE; \ 1447 rel->r_addend = 0; \ 1448 continue; \ 1449 } 1450 1451 /* Relocate a META ELF section. 1452 1453 The RELOCATE_SECTION function is called by the new ELF backend linker 1454 to handle the relocations for a section. 1455 1456 The relocs are always passed as Rela structures; if the section 1457 actually uses Rel structures, the r_addend field will always be 1458 zero. 1459 1460 This function is responsible for adjusting the section contents as 1461 necessary, and (if using Rela relocs and generating a relocatable 1462 output file) adjusting the reloc addend as necessary. 1463 1464 This function does not have to worry about setting the reloc 1465 address or the reloc symbol index. 1466 1467 LOCAL_SYMS is a pointer to the swapped in local symbols. 1468 1469 LOCAL_SECTIONS is an array giving the section in the input file 1470 corresponding to the st_shndx field of each local symbol. 1471 1472 The global hash table entry for the global symbols can be found 1473 via elf_sym_hashes (input_bfd). 1474 1475 When generating relocatable output, this function must handle 1476 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 1477 going to be the section symbol corresponding to the output 1478 section, which means that the addend must be adjusted 1479 accordingly. */ 1480 1481 static bfd_boolean 1482 elf_metag_relocate_section (bfd *output_bfd, 1483 struct bfd_link_info *info, 1484 bfd *input_bfd, 1485 asection *input_section, 1486 bfd_byte *contents, 1487 Elf_Internal_Rela *relocs, 1488 Elf_Internal_Sym *local_syms, 1489 asection **local_sections) 1490 { 1491 bfd_vma *local_got_offsets; 1492 Elf_Internal_Shdr *symtab_hdr; 1493 struct elf_link_hash_entry **eh_syms; 1494 struct elf_metag_link_hash_table *htab; 1495 Elf_Internal_Rela *rel; 1496 Elf_Internal_Rela *relend; 1497 asection *sreloc; 1498 1499 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; 1500 eh_syms = elf_sym_hashes (input_bfd); 1501 relend = relocs + input_section->reloc_count; 1502 1503 htab = metag_link_hash_table (info); 1504 local_got_offsets = elf_local_got_offsets (input_bfd); 1505 1506 sreloc = NULL; 1507 1508 for (rel = relocs; rel < relend; rel ++) 1509 { 1510 reloc_howto_type *howto; 1511 unsigned long r_symndx; 1512 Elf_Internal_Sym *sym; 1513 asection *sec; 1514 struct elf_metag_link_hash_entry *hh; 1515 bfd_vma relocation; 1516 bfd_reloc_status_type r; 1517 const char *name; 1518 int r_type; 1519 1520 r_type = ELF32_R_TYPE (rel->r_info); 1521 1522 if (r_type == R_METAG_GNU_VTINHERIT 1523 || r_type == R_METAG_GNU_VTENTRY 1524 || r_type == R_METAG_NONE) 1525 continue; 1526 1527 r_symndx = ELF32_R_SYM (rel->r_info); 1528 1529 howto = elf_metag_howto_table + ELF32_R_TYPE (rel->r_info); 1530 hh = NULL; 1531 sym = NULL; 1532 sec = NULL; 1533 1534 if (r_symndx < symtab_hdr->sh_info) 1535 { 1536 sym = local_syms + r_symndx; 1537 sec = local_sections [r_symndx]; 1538 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1539 1540 name = bfd_elf_string_from_elf_section 1541 (input_bfd, symtab_hdr->sh_link, sym->st_name); 1542 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; 1543 } 1544 else 1545 { 1546 struct elf_link_hash_entry *eh; 1547 bfd_boolean unresolved_reloc, warned, ignored; 1548 1549 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1550 r_symndx, symtab_hdr, eh_syms, 1551 eh, sec, relocation, 1552 unresolved_reloc, warned, ignored); 1553 1554 name = eh->root.root.string; 1555 hh = (struct elf_metag_link_hash_entry *) eh; 1556 } 1557 1558 if (sec != NULL && discarded_section (sec)) 1559 METAG_RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1560 rel, relend, howto, contents); 1561 1562 if (bfd_link_relocatable (info)) 1563 continue; 1564 1565 switch (r_type) 1566 { 1567 case R_METAG_ADDR32: 1568 case R_METAG_RELBRANCH: 1569 if ((input_section->flags & SEC_ALLOC) == 0) 1570 break; 1571 1572 if ((bfd_link_pic (info) 1573 && r_symndx != STN_UNDEF 1574 && (input_section->flags & SEC_ALLOC) != 0 1575 && (r_type != R_METAG_RELBRANCH 1576 || !SYMBOL_CALLS_LOCAL (info, &hh->eh))) 1577 || (!bfd_link_pic (info) 1578 && hh != NULL 1579 && hh->eh.dynindx != -1 1580 && !hh->eh.non_got_ref 1581 && ((hh->eh.def_dynamic 1582 && !hh->eh.def_regular) 1583 || hh->eh.root.type == bfd_link_hash_undefweak 1584 || hh->eh.root.type == bfd_link_hash_undefined))) 1585 { 1586 Elf_Internal_Rela outrel; 1587 bfd_boolean skip, relocate; 1588 bfd_byte *loc; 1589 1590 /* When generating a shared object, these relocations 1591 are copied into the output file to be resolved at run 1592 time. */ 1593 1594 sreloc = elf_section_data (input_section)->sreloc; 1595 BFD_ASSERT (sreloc != NULL); 1596 1597 skip = FALSE; 1598 relocate = FALSE; 1599 1600 outrel.r_offset = _bfd_elf_section_offset (output_bfd, 1601 info, 1602 input_section, 1603 rel->r_offset); 1604 if (outrel.r_offset == (bfd_vma) -1) 1605 skip = TRUE; 1606 else if (outrel.r_offset == (bfd_vma) -2) 1607 skip = TRUE, relocate = TRUE; 1608 outrel.r_offset += (input_section->output_section->vma 1609 + input_section->output_offset); 1610 1611 if (skip) 1612 { 1613 memset (&outrel, 0, sizeof outrel); 1614 outrel.r_info = ELF32_R_INFO (0, R_METAG_NONE); 1615 } 1616 else if (r_type == R_METAG_RELBRANCH) 1617 { 1618 BFD_ASSERT (hh != NULL && hh->eh.dynindx != -1); 1619 outrel.r_info = ELF32_R_INFO (hh->eh.dynindx, r_type); 1620 outrel.r_addend = rel->r_addend; 1621 } 1622 else 1623 { 1624 /* h->dynindx may be -1 if this symbol was marked to 1625 become local. */ 1626 if (hh == NULL 1627 || ((info->symbolic || hh->eh.dynindx == -1) 1628 && hh->eh.def_regular)) 1629 { 1630 relocate = TRUE; 1631 outrel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE); 1632 outrel.r_addend = relocation + rel->r_addend; 1633 } 1634 else 1635 { 1636 BFD_ASSERT (hh->eh.dynindx != -1); 1637 outrel.r_info = ELF32_R_INFO (hh->eh.dynindx, r_type); 1638 outrel.r_addend = rel->r_addend; 1639 } 1640 } 1641 1642 loc = sreloc->contents; 1643 loc += sreloc->reloc_count * sizeof(Elf32_External_Rela); 1644 bfd_elf32_swap_reloca_out (output_bfd, &outrel,loc); 1645 ++sreloc->reloc_count; 1646 1647 /* If this reloc is against an external symbol, we do 1648 not want to fiddle with the addend. Otherwise, we 1649 need to include the symbol value so that it becomes 1650 an addend for the dynamic reloc. */ 1651 if (! relocate) 1652 continue; 1653 } 1654 break; 1655 1656 case R_METAG_RELBRANCH_PLT: 1657 /* Relocation is to the entry for this symbol in the 1658 procedure linkage table. */ 1659 1660 if (hh == NULL) 1661 break; 1662 1663 if (hh->eh.forced_local) 1664 break; 1665 1666 if (hh->eh.plt.offset == (bfd_vma) -1 || 1667 htab->splt == NULL) 1668 { 1669 /* We didn't make a PLT entry for this symbol. This 1670 happens when statically linking PIC code, or when 1671 using -Bsymbolic. */ 1672 break; 1673 } 1674 1675 relocation = (htab->splt->output_section->vma 1676 + htab->splt->output_offset 1677 + hh->eh.plt.offset); 1678 break; 1679 case R_METAG_HI16_GOTPC: 1680 case R_METAG_LO16_GOTPC: 1681 BFD_ASSERT (htab->sgot != NULL); 1682 1683 relocation = (htab->sgot->output_section->vma + 1684 htab->sgot->output_offset); 1685 relocation += GOT_REG_OFFSET; 1686 relocation -= (input_section->output_section->vma 1687 + input_section->output_offset 1688 + rel->r_offset); 1689 break; 1690 case R_METAG_HI16_GOTOFF: 1691 case R_METAG_LO16_GOTOFF: 1692 case R_METAG_GETSET_GOTOFF: 1693 BFD_ASSERT (htab->sgot != NULL); 1694 1695 relocation -= (htab->sgot->output_section->vma + 1696 htab->sgot->output_offset); 1697 relocation -= GOT_REG_OFFSET; 1698 break; 1699 case R_METAG_GETSET_GOT: 1700 { 1701 bfd_vma off; 1702 bfd_boolean do_got = 0; 1703 1704 /* Relocation is to the entry for this symbol in the 1705 global offset table. */ 1706 if (hh != NULL) 1707 { 1708 bfd_boolean dyn; 1709 1710 off = hh->eh.got.offset; 1711 dyn = htab->etab.dynamic_sections_created; 1712 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 1713 bfd_link_pic (info), 1714 &hh->eh)) 1715 { 1716 /* If we aren't going to call finish_dynamic_symbol, 1717 then we need to handle initialisation of the .got 1718 entry and create needed relocs here. Since the 1719 offset must always be a multiple of 4, we use the 1720 least significant bit to record whether we have 1721 initialised it already. */ 1722 if ((off & 1) != 0) 1723 off &= ~1; 1724 else 1725 { 1726 hh->eh.got.offset |= 1; 1727 do_got = 1; 1728 } 1729 } 1730 } 1731 else 1732 { 1733 /* Local symbol case. */ 1734 if (local_got_offsets == NULL) 1735 abort (); 1736 1737 off = local_got_offsets[r_symndx]; 1738 1739 /* The offset must always be a multiple of 4. We use 1740 the least significant bit to record whether we have 1741 already generated the necessary reloc. */ 1742 if ((off & 1) != 0) 1743 off &= ~1; 1744 else 1745 { 1746 local_got_offsets[r_symndx] |= 1; 1747 do_got = 1; 1748 } 1749 } 1750 1751 if (do_got) 1752 { 1753 if (bfd_link_pic (info)) 1754 { 1755 /* Output a dynamic relocation for this GOT entry. 1756 In this case it is relative to the base of the 1757 object because the symbol index is zero. */ 1758 Elf_Internal_Rela outrel; 1759 bfd_byte *loc; 1760 asection *s = htab->srelgot; 1761 1762 outrel.r_offset = (off 1763 + htab->sgot->output_offset 1764 + htab->sgot->output_section->vma); 1765 outrel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE); 1766 outrel.r_addend = relocation; 1767 loc = s->contents; 1768 loc += s->reloc_count++ * sizeof (Elf32_External_Rela); 1769 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1770 } 1771 else 1772 bfd_put_32 (output_bfd, relocation, 1773 htab->sgot->contents + off); 1774 } 1775 1776 if (off >= (bfd_vma) -2) 1777 abort (); 1778 1779 relocation = off - GOT_REG_OFFSET; 1780 } 1781 break; 1782 case R_METAG_TLS_GD: 1783 case R_METAG_TLS_IE: 1784 { 1785 /* XXXMJF There is room here for optimisations. For example 1786 converting from GD->IE, etc. */ 1787 bfd_vma off; 1788 int indx; 1789 char tls_type; 1790 1791 if (htab->sgot == NULL) 1792 abort(); 1793 1794 indx = 0; 1795 if (hh != NULL) 1796 { 1797 bfd_boolean dyn; 1798 dyn = htab->etab.dynamic_sections_created; 1799 1800 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 1801 bfd_link_pic (info), 1802 &hh->eh) 1803 && (!bfd_link_pic (info) 1804 || !SYMBOL_REFERENCES_LOCAL (info, &hh->eh))) 1805 { 1806 indx = hh->eh.dynindx; 1807 } 1808 off = hh->eh.got.offset; 1809 tls_type = hh->tls_type; 1810 } 1811 else 1812 { 1813 /* Local symbol case. */ 1814 if (local_got_offsets == NULL) 1815 abort (); 1816 1817 off = local_got_offsets[r_symndx]; 1818 tls_type = metag_elf_local_got_tls_type (input_bfd) [r_symndx]; 1819 } 1820 1821 if (tls_type == GOT_UNKNOWN) 1822 abort(); 1823 1824 if ((off & 1) != 0) 1825 off &= ~1; 1826 else 1827 { 1828 bfd_boolean need_relocs = FALSE; 1829 Elf_Internal_Rela outrel; 1830 bfd_byte *loc = NULL; 1831 int cur_off = off; 1832 1833 /* The GOT entries have not been initialized yet. Do it 1834 now, and emit any relocations. If both an IE GOT and a 1835 GD GOT are necessary, we emit the GD first. */ 1836 1837 if ((bfd_link_pic (info) || indx != 0) 1838 && (hh == NULL 1839 || ELF_ST_VISIBILITY (hh->eh.other) == STV_DEFAULT 1840 || hh->eh.root.type != bfd_link_hash_undefweak)) 1841 { 1842 need_relocs = TRUE; 1843 loc = htab->srelgot->contents; 1844 /* FIXME (CAO): Should this be reloc_count++ ? */ 1845 loc += htab->srelgot->reloc_count * sizeof (Elf32_External_Rela); 1846 } 1847 1848 if (tls_type & GOT_TLS_GD) 1849 { 1850 if (need_relocs) 1851 { 1852 outrel.r_offset = (cur_off 1853 + htab->sgot->output_section->vma 1854 + htab->sgot->output_offset); 1855 outrel.r_info = ELF32_R_INFO (indx, R_METAG_TLS_DTPMOD); 1856 outrel.r_addend = 0; 1857 bfd_put_32 (output_bfd, 0, htab->sgot->contents + cur_off); 1858 1859 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1860 htab->srelgot->reloc_count++; 1861 loc += sizeof (Elf32_External_Rela); 1862 1863 if (indx == 0) 1864 bfd_put_32 (output_bfd, 0, 1865 htab->sgot->contents + cur_off + 4); 1866 else 1867 { 1868 bfd_put_32 (output_bfd, 0, 1869 htab->sgot->contents + cur_off + 4); 1870 outrel.r_info = ELF32_R_INFO (indx, 1871 R_METAG_TLS_DTPOFF); 1872 outrel.r_offset += 4; 1873 bfd_elf32_swap_reloca_out (output_bfd, 1874 &outrel, loc); 1875 htab->srelgot->reloc_count++; 1876 loc += sizeof (Elf32_External_Rela); 1877 } 1878 } 1879 else 1880 { 1881 /* We don't support changing the TLS model. */ 1882 abort (); 1883 } 1884 1885 cur_off += 8; 1886 } 1887 1888 if (tls_type & GOT_TLS_IE) 1889 { 1890 if (need_relocs) 1891 { 1892 outrel.r_offset = (cur_off 1893 + htab->sgot->output_section->vma 1894 + htab->sgot->output_offset); 1895 outrel.r_info = ELF32_R_INFO (indx, R_METAG_TLS_TPOFF); 1896 1897 if (indx == 0) 1898 outrel.r_addend = relocation - dtpoff_base (info); 1899 else 1900 outrel.r_addend = 0; 1901 1902 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1903 htab->srelgot->reloc_count++; 1904 loc += sizeof (Elf32_External_Rela); 1905 } 1906 else 1907 bfd_put_32 (output_bfd, tpoff (info, relocation), 1908 htab->sgot->contents + cur_off); 1909 1910 cur_off += 4; 1911 } 1912 1913 if (hh != NULL) 1914 hh->eh.got.offset |= 1; 1915 else 1916 local_got_offsets[r_symndx] |= 1; 1917 } 1918 1919 /* Add the base of the GOT to the relocation value. */ 1920 relocation = off - GOT_REG_OFFSET; 1921 1922 break; 1923 } 1924 1925 case R_METAG_TLS_IENONPIC_HI16: 1926 case R_METAG_TLS_IENONPIC_LO16: 1927 case R_METAG_TLS_LE_HI16: 1928 case R_METAG_TLS_LE_LO16: 1929 if (bfd_link_pic (info)) 1930 { 1931 (*_bfd_error_handler) 1932 (_("%B(%A+0x%lx): R_METAG_TLS_LE/IENONPIC relocation not permitted in shared object"), 1933 input_bfd, input_section, 1934 (long) rel->r_offset, howto->name); 1935 return FALSE; 1936 } 1937 else 1938 relocation = tpoff (info, relocation); 1939 break; 1940 case R_METAG_TLS_LDO_HI16: 1941 case R_METAG_TLS_LDO_LO16: 1942 if (! bfd_link_pic (info)) 1943 relocation = tpoff (info, relocation); 1944 else 1945 relocation -= dtpoff_base (info); 1946 break; 1947 case R_METAG_TLS_LDM: 1948 { 1949 bfd_vma off; 1950 1951 if (htab->sgot == NULL) 1952 abort(); 1953 off = htab->tls_ldm_got.offset; 1954 if (off & 1) 1955 off &= ~1; 1956 else 1957 { 1958 Elf_Internal_Rela outrel; 1959 bfd_byte *loc; 1960 1961 outrel.r_offset = (off 1962 + htab->sgot->output_section->vma 1963 + htab->sgot->output_offset); 1964 1965 outrel.r_addend = 0; 1966 outrel.r_info = ELF32_R_INFO (0, R_METAG_TLS_DTPMOD); 1967 loc = htab->srelgot->contents; 1968 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 1969 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1970 htab->tls_ldm_got.offset |= 1; 1971 } 1972 1973 relocation = off - GOT_REG_OFFSET; 1974 break; 1975 } 1976 default: 1977 break; 1978 } 1979 1980 r = metag_final_link_relocate (howto, input_bfd, input_section, 1981 contents, rel, relocation, hh, htab, 1982 sec); 1983 1984 if (r != bfd_reloc_ok) 1985 { 1986 const char * msg = (const char *) NULL; 1987 1988 switch (r) 1989 { 1990 case bfd_reloc_overflow: 1991 (*info->callbacks->reloc_overflow) 1992 (info, (hh ? &hh->eh.root : NULL), name, howto->name, 1993 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1994 break; 1995 1996 case bfd_reloc_undefined: 1997 (*info->callbacks->undefined_symbol) 1998 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 1999 break; 2000 2001 case bfd_reloc_outofrange: 2002 msg = _("internal error: out of range error"); 2003 break; 2004 2005 case bfd_reloc_notsupported: 2006 msg = _("internal error: unsupported relocation error"); 2007 break; 2008 2009 case bfd_reloc_dangerous: 2010 msg = _("internal error: dangerous relocation"); 2011 break; 2012 2013 default: 2014 msg = _("internal error: unknown error"); 2015 break; 2016 } 2017 2018 if (msg) 2019 (*info->callbacks->warning) (info, msg, name, input_bfd, 2020 input_section, rel->r_offset); 2021 } 2022 } 2023 2024 return TRUE; 2025 } 2026 2027 /* Create the .plt and .got sections, and set up our hash table 2028 short-cuts to various dynamic sections. */ 2029 2030 static bfd_boolean 2031 elf_metag_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) 2032 { 2033 struct elf_metag_link_hash_table *htab; 2034 struct elf_link_hash_entry *eh; 2035 struct bfd_link_hash_entry *bh; 2036 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 2037 2038 /* Don't try to create the .plt and .got twice. */ 2039 htab = metag_link_hash_table (info); 2040 if (htab->splt != NULL) 2041 return TRUE; 2042 2043 /* Call the generic code to do most of the work. */ 2044 if (! _bfd_elf_create_dynamic_sections (abfd, info)) 2045 return FALSE; 2046 2047 htab->sgot = bfd_get_linker_section (abfd, ".got"); 2048 if (! htab->sgot) 2049 return FALSE; 2050 2051 htab->sgotplt = bfd_make_section_with_flags (abfd, ".got.plt", 2052 (SEC_ALLOC | SEC_LOAD | 2053 SEC_HAS_CONTENTS | 2054 SEC_IN_MEMORY | 2055 SEC_LINKER_CREATED)); 2056 if (htab->sgotplt == NULL 2057 || !bfd_set_section_alignment (abfd, htab->sgotplt, 2)) 2058 return FALSE; 2059 2060 /* Define the symbol __GLOBAL_OFFSET_TABLE__ at the start of the .got 2061 section. We don't do this in the linker script because we don't want 2062 to define the symbol if we are not creating a global offset table. */ 2063 bh = NULL; 2064 if (!(_bfd_generic_link_add_one_symbol 2065 (info, abfd, "__GLOBAL_OFFSET_TABLE__", BSF_GLOBAL, htab->sgot, 2066 (bfd_vma) 0, NULL, FALSE, bed->collect, &bh))) 2067 return FALSE; 2068 eh = (struct elf_link_hash_entry *) bh; 2069 eh->def_regular = 1; 2070 eh->type = STT_OBJECT; 2071 eh->other = STV_HIDDEN; 2072 2073 if (! bfd_link_executable (info) 2074 && ! bfd_elf_link_record_dynamic_symbol (info, eh)) 2075 return FALSE; 2076 2077 elf_hash_table (info)->hgot = eh; 2078 2079 htab->splt = bfd_get_linker_section (abfd, ".plt"); 2080 htab->srelplt = bfd_get_linker_section (abfd, ".rela.plt"); 2081 2082 htab->srelgot = bfd_get_linker_section (abfd, ".rela.got"); 2083 2084 htab->sdynbss = bfd_get_linker_section (abfd, ".dynbss"); 2085 htab->srelbss = bfd_get_linker_section (abfd, ".rela.bss"); 2086 2087 return TRUE; 2088 } 2089 2090 /* Look through the relocs for a section during the first phase, and 2091 calculate needed space in the global offset table, procedure linkage 2092 table, and dynamic reloc sections. At this point we haven't 2093 necessarily read all the input files. */ 2094 2095 static bfd_boolean 2096 elf_metag_check_relocs (bfd *abfd, 2097 struct bfd_link_info *info, 2098 asection *sec, 2099 const Elf_Internal_Rela *relocs) 2100 { 2101 Elf_Internal_Shdr *symtab_hdr; 2102 struct elf_link_hash_entry **eh_syms; 2103 const Elf_Internal_Rela *rel; 2104 const Elf_Internal_Rela *rel_end; 2105 struct elf_metag_link_hash_table *htab; 2106 asection *sreloc; 2107 bfd *dynobj; 2108 int tls_type = GOT_UNKNOWN, old_tls_type = GOT_UNKNOWN; 2109 2110 if (bfd_link_relocatable (info)) 2111 return TRUE; 2112 2113 htab = metag_link_hash_table (info); 2114 dynobj = htab->etab.dynobj; 2115 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2116 eh_syms = elf_sym_hashes (abfd); 2117 sreloc = NULL; 2118 2119 if (htab == NULL) 2120 return FALSE; 2121 2122 rel_end = relocs + sec->reloc_count; 2123 for (rel = relocs; rel < rel_end; rel++) 2124 { 2125 int r_type; 2126 struct elf_metag_link_hash_entry *hh; 2127 Elf_Internal_Sym *isym; 2128 unsigned long r_symndx; 2129 2130 r_symndx = ELF32_R_SYM (rel->r_info); 2131 r_type = ELF32_R_TYPE (rel->r_info); 2132 if (r_symndx < symtab_hdr->sh_info) 2133 { 2134 /* A local symbol. */ 2135 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 2136 abfd, r_symndx); 2137 if (isym == NULL) 2138 return FALSE; 2139 2140 hh = NULL; 2141 } 2142 else 2143 { 2144 isym = NULL; 2145 2146 hh = (struct elf_metag_link_hash_entry *) 2147 eh_syms[r_symndx - symtab_hdr->sh_info]; 2148 while (hh->eh.root.type == bfd_link_hash_indirect 2149 || hh->eh.root.type == bfd_link_hash_warning) 2150 hh = (struct elf_metag_link_hash_entry *) hh->eh.root.u.i.link; 2151 2152 /* PR15323, ref flags aren't set for references in the same 2153 object. */ 2154 hh->eh.root.non_ir_ref = 1; 2155 } 2156 2157 /* Some relocs require a global offset table. */ 2158 if (htab->sgot == NULL) 2159 { 2160 switch (r_type) 2161 { 2162 case R_METAG_TLS_GD: 2163 case R_METAG_TLS_LDM: 2164 case R_METAG_TLS_IE: 2165 if (bfd_link_pic (info)) 2166 info->flags |= DF_STATIC_TLS; 2167 /* Fall through. */ 2168 2169 case R_METAG_HI16_GOTOFF: 2170 case R_METAG_LO16_GOTOFF: 2171 case R_METAG_GETSET_GOTOFF: 2172 case R_METAG_GETSET_GOT: 2173 case R_METAG_HI16_GOTPC: 2174 case R_METAG_LO16_GOTPC: 2175 if (dynobj == NULL) 2176 htab->etab.dynobj = dynobj = abfd; 2177 if (!elf_metag_create_dynamic_sections (dynobj, info)) 2178 return FALSE; 2179 break; 2180 2181 default: 2182 break; 2183 } 2184 } 2185 2186 switch (r_type) 2187 { 2188 case R_METAG_TLS_IE: 2189 case R_METAG_TLS_GD: 2190 case R_METAG_GETSET_GOT: 2191 switch (r_type) 2192 { 2193 default: 2194 tls_type = GOT_NORMAL; 2195 break; 2196 case R_METAG_TLS_IE: 2197 tls_type = GOT_TLS_IE; 2198 break; 2199 case R_METAG_TLS_GD: 2200 tls_type = GOT_TLS_GD; 2201 break; 2202 } 2203 2204 if (hh != NULL) 2205 { 2206 hh->eh.got.refcount += 1; 2207 old_tls_type = hh->tls_type; 2208 } 2209 else 2210 { 2211 bfd_signed_vma *local_got_refcounts; 2212 2213 /* This is a global offset table entry for a local 2214 symbol. */ 2215 local_got_refcounts = elf_local_got_refcounts (abfd); 2216 if (local_got_refcounts == NULL) 2217 { 2218 bfd_size_type size; 2219 2220 size = symtab_hdr->sh_info; 2221 size *= sizeof (bfd_signed_vma); 2222 /* Add in space to store the local GOT TLS types. */ 2223 size += symtab_hdr->sh_info; 2224 local_got_refcounts = ((bfd_signed_vma *) 2225 bfd_zalloc (abfd, size)); 2226 if (local_got_refcounts == NULL) 2227 return FALSE; 2228 elf_local_got_refcounts (abfd) = local_got_refcounts; 2229 memset (metag_elf_local_got_tls_type (abfd), 2230 GOT_UNKNOWN, symtab_hdr->sh_info); 2231 } 2232 local_got_refcounts[r_symndx] += 1; 2233 old_tls_type = metag_elf_local_got_tls_type (abfd) [r_symndx]; 2234 } 2235 2236 if (old_tls_type != tls_type) 2237 { 2238 if (hh != NULL) 2239 { 2240 hh->tls_type = tls_type; 2241 } 2242 else 2243 { 2244 metag_elf_local_got_tls_type (abfd) [r_symndx] = tls_type; 2245 } 2246 } 2247 2248 break; 2249 2250 case R_METAG_TLS_LDM: 2251 metag_link_hash_table (info)->tls_ldm_got.refcount += 1; 2252 break; 2253 2254 case R_METAG_RELBRANCH_PLT: 2255 /* This symbol requires a procedure linkage table entry. We 2256 actually build the entry in adjust_dynamic_symbol, 2257 because this might be a case of linking PIC code without 2258 linking in any dynamic objects, in which case we don't 2259 need to generate a procedure linkage table after all. */ 2260 2261 /* If this is a local symbol, we resolve it directly without 2262 creating a procedure linkage table entry. */ 2263 if (hh == NULL) 2264 continue; 2265 2266 if (hh->eh.forced_local) 2267 break; 2268 2269 hh->eh.needs_plt = 1; 2270 hh->eh.plt.refcount += 1; 2271 break; 2272 2273 case R_METAG_HIADDR16: 2274 case R_METAG_LOADDR16: 2275 /* Let's help debug shared library creation. These relocs 2276 cannot be used in shared libs. Don't error out for 2277 sections we don't care about, such as debug sections or 2278 non-constant sections. */ 2279 if (bfd_link_pic (info) 2280 && (sec->flags & SEC_ALLOC) != 0 2281 && (sec->flags & SEC_READONLY) != 0) 2282 { 2283 const char *name; 2284 2285 if (hh) 2286 name = hh->eh.root.root.string; 2287 else 2288 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); 2289 (*_bfd_error_handler) 2290 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), 2291 abfd, elf_metag_howto_table[r_type].name, name); 2292 bfd_set_error (bfd_error_bad_value); 2293 return FALSE; 2294 } 2295 2296 /* Fall through. */ 2297 case R_METAG_ADDR32: 2298 case R_METAG_RELBRANCH: 2299 case R_METAG_GETSETOFF: 2300 if (hh != NULL && !bfd_link_pic (info)) 2301 { 2302 hh->eh.non_got_ref = 1; 2303 hh->eh.plt.refcount += 1; 2304 } 2305 2306 /* If we are creating a shared library, and this is a reloc 2307 against a global symbol, or a non PC relative reloc 2308 against a local symbol, then we need to copy the reloc 2309 into the shared library. However, if we are linking with 2310 -Bsymbolic, we do not need to copy a reloc against a 2311 global symbol which is defined in an object we are 2312 including in the link (i.e., DEF_REGULAR is set). At 2313 this point we have not seen all the input files, so it is 2314 possible that DEF_REGULAR is not set now but will be set 2315 later (it is never cleared). We account for that 2316 possibility below by storing information in the 2317 dyn_relocs field of the hash table entry. A similar 2318 situation occurs when creating shared libraries and symbol 2319 visibility changes render the symbol local. 2320 2321 If on the other hand, we are creating an executable, we 2322 may need to keep relocations for symbols satisfied by a 2323 dynamic library if we manage to avoid copy relocs for the 2324 symbol. */ 2325 if ((bfd_link_pic (info) 2326 && (sec->flags & SEC_ALLOC) != 0 2327 && (r_type != R_METAG_RELBRANCH 2328 || (hh != NULL 2329 && (! info->symbolic 2330 || hh->eh.root.type == bfd_link_hash_defweak 2331 || !hh->eh.def_regular)))) 2332 || (!bfd_link_pic (info) 2333 && (sec->flags & SEC_ALLOC) != 0 2334 && hh != NULL 2335 && (hh->eh.root.type == bfd_link_hash_defweak 2336 || !hh->eh.def_regular))) 2337 { 2338 struct elf_metag_dyn_reloc_entry *hdh_p; 2339 struct elf_metag_dyn_reloc_entry **hdh_head; 2340 2341 if (dynobj == NULL) 2342 htab->etab.dynobj = dynobj = abfd; 2343 2344 /* When creating a shared object, we must copy these 2345 relocs into the output file. We create a reloc 2346 section in dynobj and make room for the reloc. */ 2347 if (sreloc == NULL) 2348 { 2349 sreloc = _bfd_elf_make_dynamic_reloc_section 2350 (sec, htab->etab.dynobj, 2, abfd, /*rela?*/ TRUE); 2351 2352 if (sreloc == NULL) 2353 { 2354 bfd_set_error (bfd_error_bad_value); 2355 return FALSE; 2356 } 2357 2358 elf_section_data (sec)->sreloc = sreloc; 2359 } 2360 2361 /* If this is a global symbol, we count the number of 2362 relocations we need for this symbol. */ 2363 if (hh != NULL) 2364 hdh_head = &((struct elf_metag_link_hash_entry *) hh)->dyn_relocs; 2365 else 2366 { 2367 /* Track dynamic relocs needed for local syms too. */ 2368 asection *sr; 2369 void *vpp; 2370 2371 sr = bfd_section_from_elf_index (abfd, isym->st_shndx); 2372 if (sr == NULL) 2373 sr = sec; 2374 2375 vpp = &elf_section_data (sr)->local_dynrel; 2376 hdh_head = (struct elf_metag_dyn_reloc_entry **) vpp; 2377 } 2378 2379 hdh_p = *hdh_head; 2380 if (hdh_p == NULL || hdh_p->sec != sec) 2381 { 2382 hdh_p = ((struct elf_metag_dyn_reloc_entry *) 2383 bfd_alloc (dynobj, sizeof *hdh_p)); 2384 if (hdh_p == NULL) 2385 return FALSE; 2386 hdh_p->hdh_next = *hdh_head; 2387 *hdh_head = hdh_p; 2388 hdh_p->sec = sec; 2389 hdh_p->count = 0; 2390 hdh_p->relative_count = 0; 2391 } 2392 2393 hdh_p->count += 1; 2394 if (ELF32_R_TYPE (rel->r_info) == R_METAG_RELBRANCH) 2395 hdh_p->relative_count += 1; 2396 } 2397 break; 2398 2399 /* This relocation describes the C++ object vtable hierarchy. 2400 Reconstruct it for later use during GC. */ 2401 case R_METAG_GNU_VTINHERIT: 2402 if (!bfd_elf_gc_record_vtinherit (abfd, sec, &hh->eh, 2403 rel->r_offset)) 2404 return FALSE; 2405 break; 2406 2407 /* This relocation describes which C++ vtable entries are actually 2408 used. Record for later use during GC. */ 2409 case R_METAG_GNU_VTENTRY: 2410 BFD_ASSERT (hh != NULL); 2411 if (hh != NULL 2412 && !bfd_elf_gc_record_vtentry (abfd, sec, &hh->eh, rel->r_addend)) 2413 return FALSE; 2414 break; 2415 } 2416 } 2417 2418 return TRUE; 2419 } 2420 2421 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 2422 2423 static void 2424 elf_metag_copy_indirect_symbol (struct bfd_link_info *info, 2425 struct elf_link_hash_entry *eh_dir, 2426 struct elf_link_hash_entry *eh_ind) 2427 { 2428 struct elf_metag_link_hash_entry *hh_dir, *hh_ind; 2429 2430 hh_dir = metag_elf_hash_entry (eh_dir); 2431 hh_ind = metag_elf_hash_entry (eh_ind); 2432 2433 if (hh_ind->dyn_relocs != NULL) 2434 { 2435 if (hh_dir->dyn_relocs != NULL) 2436 { 2437 struct elf_metag_dyn_reloc_entry **hdh_pp; 2438 struct elf_metag_dyn_reloc_entry *hdh_p; 2439 2440 if (eh_ind->root.type == bfd_link_hash_indirect) 2441 abort (); 2442 2443 /* Add reloc counts against the weak sym to the strong sym 2444 list. Merge any entries against the same section. */ 2445 for (hdh_pp = &hh_ind->dyn_relocs; (hdh_p = *hdh_pp) != NULL; ) 2446 { 2447 struct elf_metag_dyn_reloc_entry *hdh_q; 2448 2449 for (hdh_q = hh_dir->dyn_relocs; hdh_q != NULL; 2450 hdh_q = hdh_q->hdh_next) 2451 if (hdh_q->sec == hdh_p->sec) 2452 { 2453 hdh_q->relative_count += hdh_p->relative_count; 2454 hdh_q->count += hdh_p->count; 2455 *hdh_pp = hdh_p->hdh_next; 2456 break; 2457 } 2458 if (hdh_q == NULL) 2459 hdh_pp = &hdh_p->hdh_next; 2460 } 2461 *hdh_pp = hh_dir->dyn_relocs; 2462 } 2463 2464 hh_dir->dyn_relocs = hh_ind->dyn_relocs; 2465 hh_ind->dyn_relocs = NULL; 2466 } 2467 2468 if (eh_ind->root.type == bfd_link_hash_indirect 2469 && eh_dir->got.refcount <= 0) 2470 { 2471 hh_dir->tls_type = hh_ind->tls_type; 2472 hh_ind->tls_type = GOT_UNKNOWN; 2473 } 2474 2475 _bfd_elf_link_hash_copy_indirect (info, eh_dir, eh_ind); 2476 } 2477 2478 /* Adjust a symbol defined by a dynamic object and referenced by a 2479 regular object. The current definition is in some section of the 2480 dynamic object, but we're not including those sections. We have to 2481 change the definition to something the rest of the link can 2482 understand. */ 2483 2484 static bfd_boolean 2485 elf_metag_adjust_dynamic_symbol (struct bfd_link_info *info, 2486 struct elf_link_hash_entry *eh) 2487 { 2488 struct elf_metag_link_hash_table *htab; 2489 struct elf_metag_link_hash_entry *hh; 2490 struct elf_metag_dyn_reloc_entry *hdh_p; 2491 asection *s; 2492 2493 /* If this is a function, put it in the procedure linkage table. We 2494 will fill in the contents of the procedure linkage table later, 2495 when we know the address of the .got section. */ 2496 if (eh->type == STT_FUNC 2497 || eh->needs_plt) 2498 { 2499 if (eh->plt.refcount <= 0 2500 || SYMBOL_CALLS_LOCAL (info, eh) 2501 || (ELF_ST_VISIBILITY (eh->other) != STV_DEFAULT 2502 && eh->root.type == bfd_link_hash_undefweak)) 2503 { 2504 /* This case can occur if we saw a PLT reloc in an input 2505 file, but the symbol was never referred to by a dynamic 2506 object. In such a case, we don't actually need to build 2507 a procedure linkage table, and we can just do a PCREL 2508 reloc instead. */ 2509 eh->plt.offset = (bfd_vma) -1; 2510 eh->needs_plt = 0; 2511 } 2512 2513 return TRUE; 2514 } 2515 else 2516 eh->plt.offset = (bfd_vma) -1; 2517 2518 /* If this is a weak symbol, and there is a real definition, the 2519 processor independent code will have arranged for us to see the 2520 real definition first, and we can just use the same value. */ 2521 if (eh->u.weakdef != NULL) 2522 { 2523 if (eh->u.weakdef->root.type != bfd_link_hash_defined 2524 && eh->u.weakdef->root.type != bfd_link_hash_defweak) 2525 abort (); 2526 eh->root.u.def.section = eh->u.weakdef->root.u.def.section; 2527 eh->root.u.def.value = eh->u.weakdef->root.u.def.value; 2528 eh->non_got_ref = eh->u.weakdef->non_got_ref; 2529 return TRUE; 2530 } 2531 2532 /* This is a reference to a symbol defined by a dynamic object which 2533 is not a function. */ 2534 2535 /* If we are creating a shared library, we must presume that the 2536 only references to the symbol are via the global offset table. 2537 For such cases we need not do anything here; the relocations will 2538 be handled correctly by relocate_section. */ 2539 if (bfd_link_pic (info)) 2540 return TRUE; 2541 2542 /* If there are no references to this symbol that do not use the 2543 GOT, we don't need to generate a copy reloc. */ 2544 if (!eh->non_got_ref) 2545 return TRUE; 2546 2547 /* If -z nocopyreloc was given, we won't generate them either. */ 2548 if (info->nocopyreloc) 2549 { 2550 eh->non_got_ref = 0; 2551 return TRUE; 2552 } 2553 2554 hh = (struct elf_metag_link_hash_entry *) eh; 2555 for (hdh_p = hh->dyn_relocs; hdh_p != NULL; hdh_p = hdh_p->hdh_next) 2556 { 2557 s = hdh_p->sec->output_section; 2558 if (s != NULL && (s->flags & SEC_READONLY) != 0) 2559 break; 2560 } 2561 2562 /* If we didn't find any dynamic relocs in read-only sections, then 2563 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 2564 if (hdh_p == NULL) 2565 { 2566 eh->non_got_ref = 0; 2567 return TRUE; 2568 } 2569 2570 /* We must allocate the symbol in our .dynbss section, which will 2571 become part of the .bss section of the executable. There will be 2572 an entry for this symbol in the .dynsym section. The dynamic 2573 object will contain position independent code, so all references 2574 from the dynamic object to this symbol will go through the global 2575 offset table. The dynamic linker will use the .dynsym entry to 2576 determine the address it must put in the global offset table, so 2577 both the dynamic object and the regular object will refer to the 2578 same memory location for the variable. */ 2579 2580 htab = metag_link_hash_table (info); 2581 2582 /* We must generate a COPY reloc to tell the dynamic linker to 2583 copy the initial value out of the dynamic object and into the 2584 runtime process image. */ 2585 if ((eh->root.u.def.section->flags & SEC_ALLOC) != 0 && eh->size != 0) 2586 { 2587 htab->srelbss->size += sizeof (Elf32_External_Rela); 2588 eh->needs_copy = 1; 2589 } 2590 2591 s = htab->sdynbss; 2592 2593 return _bfd_elf_adjust_dynamic_copy (info, eh, s); 2594 } 2595 2596 /* Allocate space in .plt, .got and associated reloc sections for 2597 global syms. */ 2598 2599 static bfd_boolean 2600 allocate_dynrelocs (struct elf_link_hash_entry *eh, void *inf) 2601 { 2602 struct bfd_link_info *info; 2603 struct elf_metag_link_hash_table *htab; 2604 struct elf_metag_link_hash_entry *hh; 2605 struct elf_metag_dyn_reloc_entry *hdh_p; 2606 2607 if (eh->root.type == bfd_link_hash_indirect) 2608 return TRUE; 2609 2610 if (eh->root.type == bfd_link_hash_warning) 2611 eh = (struct elf_link_hash_entry *) eh->root.u.i.link; 2612 2613 info = inf; 2614 htab = metag_link_hash_table (info); 2615 2616 if (htab->etab.dynamic_sections_created 2617 && eh->plt.refcount > 0) 2618 { 2619 /* Make sure this symbol is output as a dynamic symbol. 2620 Undefined weak syms won't yet be marked as dynamic. */ 2621 if (eh->dynindx == -1 2622 && !eh->forced_local) 2623 { 2624 if (! bfd_elf_link_record_dynamic_symbol (info, eh)) 2625 return FALSE; 2626 } 2627 2628 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, bfd_link_pic (info), eh)) 2629 { 2630 asection *s = htab->splt; 2631 2632 /* If this is the first .plt entry, make room for the special 2633 first entry. */ 2634 if (s->size == 0) 2635 s->size += PLT_ENTRY_SIZE; 2636 2637 eh->plt.offset = s->size; 2638 2639 /* If this symbol is not defined in a regular file, and we are 2640 not generating a shared library, then set the symbol to this 2641 location in the .plt. This is required to make function 2642 pointers compare as equal between the normal executable and 2643 the shared library. */ 2644 if (! bfd_link_pic (info) 2645 && !eh->def_regular) 2646 { 2647 eh->root.u.def.section = s; 2648 eh->root.u.def.value = eh->plt.offset; 2649 } 2650 2651 /* Make room for this entry. */ 2652 s->size += PLT_ENTRY_SIZE; 2653 2654 /* We also need to make an entry in the .got.plt section, which 2655 will be placed in the .got section by the linker script. */ 2656 htab->sgotplt->size += 4; 2657 2658 /* We also need to make an entry in the .rel.plt section. */ 2659 htab->srelplt->size += sizeof (Elf32_External_Rela); 2660 } 2661 else 2662 { 2663 eh->plt.offset = (bfd_vma) -1; 2664 eh->needs_plt = 0; 2665 } 2666 } 2667 else 2668 { 2669 eh->plt.offset = (bfd_vma) -1; 2670 eh->needs_plt = 0; 2671 } 2672 2673 if (eh->got.refcount > 0) 2674 { 2675 asection *s; 2676 bfd_boolean dyn; 2677 int tls_type = metag_elf_hash_entry (eh)->tls_type; 2678 2679 /* Make sure this symbol is output as a dynamic symbol. 2680 Undefined weak syms won't yet be marked as dynamic. */ 2681 if (eh->dynindx == -1 2682 && !eh->forced_local) 2683 { 2684 if (! bfd_elf_link_record_dynamic_symbol (info, eh)) 2685 return FALSE; 2686 } 2687 2688 s = htab->sgot; 2689 2690 eh->got.offset = s->size; 2691 s->size += 4; 2692 /* R_METAG_TLS_GD needs 2 consecutive GOT slots. */ 2693 if (tls_type == GOT_TLS_GD) 2694 s->size += 4; 2695 dyn = htab->etab.dynamic_sections_created; 2696 /* R_METAG_TLS_IE needs one dynamic relocation if dynamic, 2697 R_METAG_TLS_GD needs one if local symbol and two if global. */ 2698 if ((tls_type == GOT_TLS_GD && eh->dynindx == -1) 2699 || (tls_type == GOT_TLS_IE && dyn)) 2700 htab->srelgot->size += sizeof (Elf32_External_Rela); 2701 else if (tls_type == GOT_TLS_GD) 2702 htab->srelgot->size += 2 * sizeof (Elf32_External_Rela); 2703 else if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 2704 bfd_link_pic (info), 2705 eh)) 2706 htab->srelgot->size += sizeof (Elf32_External_Rela); 2707 } 2708 else 2709 eh->got.offset = (bfd_vma) -1; 2710 2711 hh = (struct elf_metag_link_hash_entry *) eh; 2712 if (hh->dyn_relocs == NULL) 2713 return TRUE; 2714 2715 /* If this is a -Bsymbolic shared link, then we need to discard all 2716 space allocated for dynamic pc-relative relocs against symbols 2717 defined in a regular object. For the normal shared case, discard 2718 space for relocs that have become local due to symbol visibility 2719 changes. */ 2720 if (bfd_link_pic (info)) 2721 { 2722 if (SYMBOL_CALLS_LOCAL (info, eh)) 2723 { 2724 struct elf_metag_dyn_reloc_entry **hdh_pp; 2725 2726 for (hdh_pp = &hh->dyn_relocs; (hdh_p = *hdh_pp) != NULL; ) 2727 { 2728 hdh_p->count -= hdh_p->relative_count; 2729 hdh_p->relative_count = 0; 2730 if (hdh_p->count == 0) 2731 *hdh_pp = hdh_p->hdh_next; 2732 else 2733 hdh_pp = &hdh_p->hdh_next; 2734 } 2735 } 2736 2737 /* Also discard relocs on undefined weak syms with non-default 2738 visibility. */ 2739 if (hh->dyn_relocs != NULL 2740 && eh->root.type == bfd_link_hash_undefweak) 2741 { 2742 if (ELF_ST_VISIBILITY (eh->other) != STV_DEFAULT) 2743 hh->dyn_relocs = NULL; 2744 2745 /* Make sure undefined weak symbols are output as a dynamic 2746 symbol in PIEs. */ 2747 else if (eh->dynindx == -1 2748 && !eh->forced_local) 2749 { 2750 if (! bfd_elf_link_record_dynamic_symbol (info, eh)) 2751 return FALSE; 2752 } 2753 } 2754 } 2755 else 2756 { 2757 /* For the non-shared case, discard space for relocs against 2758 symbols which turn out to need copy relocs or are not 2759 dynamic. */ 2760 if (!eh->non_got_ref 2761 && ((eh->def_dynamic 2762 && !eh->def_regular) 2763 || (htab->etab.dynamic_sections_created 2764 && (eh->root.type == bfd_link_hash_undefweak 2765 || eh->root.type == bfd_link_hash_undefined)))) 2766 { 2767 /* Make sure this symbol is output as a dynamic symbol. 2768 Undefined weak syms won't yet be marked as dynamic. */ 2769 if (eh->dynindx == -1 2770 && !eh->forced_local) 2771 { 2772 if (! bfd_elf_link_record_dynamic_symbol (info, eh)) 2773 return FALSE; 2774 } 2775 2776 /* If that succeeded, we know we'll be keeping all the 2777 relocs. */ 2778 if (eh->dynindx != -1) 2779 goto keep; 2780 } 2781 2782 hh->dyn_relocs = NULL; 2783 return TRUE; 2784 2785 keep: ; 2786 } 2787 2788 /* Finally, allocate space. */ 2789 for (hdh_p = hh->dyn_relocs; hdh_p != NULL; hdh_p = hdh_p->hdh_next) 2790 { 2791 asection *sreloc = elf_section_data (hdh_p->sec)->sreloc; 2792 sreloc->size += hdh_p->count * sizeof (Elf32_External_Rela); 2793 } 2794 2795 return TRUE; 2796 } 2797 2798 /* Find any dynamic relocs that apply to read-only sections. */ 2799 2800 static bfd_boolean 2801 readonly_dynrelocs (struct elf_link_hash_entry *eh, void *inf) 2802 { 2803 struct elf_metag_link_hash_entry *hh; 2804 struct elf_metag_dyn_reloc_entry *hdh_p; 2805 2806 if (eh->root.type == bfd_link_hash_warning) 2807 eh = (struct elf_link_hash_entry *) eh->root.u.i.link; 2808 2809 hh = (struct elf_metag_link_hash_entry *) eh; 2810 for (hdh_p = hh->dyn_relocs; hdh_p != NULL; hdh_p = hdh_p->hdh_next) 2811 { 2812 asection *s = hdh_p->sec->output_section; 2813 2814 if (s != NULL && (s->flags & SEC_READONLY) != 0) 2815 { 2816 struct bfd_link_info *info = inf; 2817 2818 info->flags |= DF_TEXTREL; 2819 2820 /* Not an error, just cut short the traversal. */ 2821 return FALSE; 2822 } 2823 } 2824 return TRUE; 2825 } 2826 2827 /* Set the sizes of the dynamic sections. */ 2828 2829 static bfd_boolean 2830 elf_metag_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 2831 struct bfd_link_info *info) 2832 { 2833 struct elf_metag_link_hash_table *htab; 2834 bfd *dynobj; 2835 bfd *ibfd; 2836 asection *s; 2837 bfd_boolean relocs; 2838 2839 htab = metag_link_hash_table (info); 2840 dynobj = htab->etab.dynobj; 2841 if (dynobj == NULL) 2842 abort (); 2843 2844 if (htab->etab.dynamic_sections_created) 2845 { 2846 /* Set the contents of the .interp section to the interpreter. */ 2847 if (bfd_link_executable (info) && !info->nointerp) 2848 { 2849 s = bfd_get_linker_section (dynobj, ".interp"); 2850 if (s == NULL) 2851 abort (); 2852 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2853 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2854 } 2855 } 2856 2857 /* Set up .got offsets for local syms, and space for local dynamic 2858 relocs. */ 2859 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 2860 { 2861 bfd_signed_vma *local_got; 2862 bfd_signed_vma *end_local_got; 2863 bfd_size_type locsymcount; 2864 Elf_Internal_Shdr *symtab_hdr; 2865 asection *srel; 2866 char *local_tls_type; 2867 2868 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 2869 continue; 2870 2871 for (s = ibfd->sections; s != NULL; s = s->next) 2872 { 2873 struct elf_metag_dyn_reloc_entry *hdh_p; 2874 2875 for (hdh_p = ((struct elf_metag_dyn_reloc_entry *) 2876 elf_section_data (s)->local_dynrel); 2877 hdh_p != NULL; 2878 hdh_p = hdh_p->hdh_next) 2879 { 2880 if (!bfd_is_abs_section (hdh_p->sec) 2881 && bfd_is_abs_section (hdh_p->sec->output_section)) 2882 { 2883 /* Input section has been discarded, either because 2884 it is a copy of a linkonce section or due to 2885 linker script /DISCARD/, so we'll be discarding 2886 the relocs too. */ 2887 } 2888 else if (hdh_p->count != 0) 2889 { 2890 srel = elf_section_data (hdh_p->sec)->sreloc; 2891 srel->size += hdh_p->count * sizeof (Elf32_External_Rela); 2892 if ((hdh_p->sec->output_section->flags & SEC_READONLY) != 0) 2893 info->flags |= DF_TEXTREL; 2894 } 2895 } 2896 } 2897 2898 local_got = elf_local_got_refcounts (ibfd); 2899 if (!local_got) 2900 continue; 2901 2902 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 2903 locsymcount = symtab_hdr->sh_info; 2904 end_local_got = local_got + locsymcount; 2905 local_tls_type = metag_elf_local_got_tls_type (ibfd); 2906 s = htab->sgot; 2907 srel = htab->srelgot; 2908 for (; local_got < end_local_got; ++local_got) 2909 { 2910 if (*local_got > 0) 2911 { 2912 *local_got = s->size; 2913 s->size += GOT_ENTRY_SIZE; 2914 /* R_METAG_TLS_GD relocs need 2 consecutive GOT entries. */ 2915 if (*local_tls_type == GOT_TLS_GD) 2916 s->size += 4; 2917 if (bfd_link_pic (info)) 2918 srel->size += sizeof (Elf32_External_Rela); 2919 } 2920 else 2921 *local_got = (bfd_vma) -1; 2922 ++local_tls_type; 2923 } 2924 } 2925 2926 if (htab->tls_ldm_got.refcount > 0) 2927 { 2928 /* Allocate 2 got entries and 1 dynamic reloc for R_METAG_TLS_LDM 2929 reloc. */ 2930 htab->tls_ldm_got.offset = htab->sgot->size; 2931 htab->sgot->size += 8; 2932 htab->srelgot->size += sizeof (Elf32_External_Rela); 2933 } 2934 else 2935 htab->tls_ldm_got.offset = -1; 2936 2937 /* Allocate global sym .plt and .got entries, and space for global 2938 sym dynamic relocs. */ 2939 elf_link_hash_traverse (&htab->etab, allocate_dynrelocs, info); 2940 2941 /* We now have determined the sizes of the various dynamic sections. 2942 Allocate memory for them. */ 2943 relocs = FALSE; 2944 for (s = dynobj->sections; s != NULL; s = s->next) 2945 { 2946 bfd_boolean reloc_section = FALSE; 2947 2948 if ((s->flags & SEC_LINKER_CREATED) == 0) 2949 continue; 2950 2951 if (s == htab->splt 2952 || s == htab->sgot 2953 || s == htab->sgotplt 2954 || s == htab->sdynbss) 2955 { 2956 /* Strip this section if we don't need it; see the 2957 comment below. */ 2958 } 2959 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 2960 { 2961 if (s->size != 0 && s != htab->srelplt) 2962 relocs = TRUE; 2963 2964 /* We use the reloc_count field as a counter if we need 2965 to copy relocs into the output file. */ 2966 s->reloc_count = 0; 2967 reloc_section = TRUE; 2968 } 2969 else 2970 { 2971 /* It's not one of our sections, so don't allocate space. */ 2972 continue; 2973 } 2974 2975 if (s->size == 0) 2976 { 2977 /* If we don't need this section, strip it from the 2978 output file. This is mostly to handle .rela.bss and 2979 .rela.plt. We must create both sections in 2980 create_dynamic_sections, because they must be created 2981 before the linker maps input sections to output 2982 sections. The linker does that before 2983 adjust_dynamic_symbol is called, and it is that 2984 function which decides whether anything needs to go 2985 into these sections. */ 2986 s->flags |= SEC_EXCLUDE; 2987 continue; 2988 } 2989 2990 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2991 continue; 2992 2993 /* Allocate memory for the section contents. */ 2994 s->contents = bfd_zalloc (dynobj, s->size); 2995 if (s->contents == NULL) 2996 return FALSE; 2997 else if (reloc_section) 2998 { 2999 unsigned char *contents = s->contents; 3000 Elf32_External_Rela reloc; 3001 3002 /* Fill the reloc section with a R_METAG_NONE type reloc. */ 3003 memset(&reloc, 0, sizeof(Elf32_External_Rela)); 3004 reloc.r_info[0] = R_METAG_NONE; 3005 for (; contents < (s->contents + s->size); 3006 contents += sizeof(Elf32_External_Rela)) 3007 { 3008 memcpy(contents, &reloc, sizeof(Elf32_External_Rela)); 3009 } 3010 } 3011 } 3012 3013 if (htab->etab.dynamic_sections_created) 3014 { 3015 /* Add some entries to the .dynamic section. We fill in the 3016 values later, in elf_metag_finish_dynamic_sections, but we 3017 must add the entries now so that we get the correct size for 3018 the .dynamic section. The DT_DEBUG entry is filled in by the 3019 dynamic linker and used by the debugger. */ 3020 #define add_dynamic_entry(TAG, VAL) \ 3021 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 3022 3023 if (!add_dynamic_entry (DT_PLTGOT, 0)) 3024 return FALSE; 3025 3026 if (bfd_link_executable (info)) 3027 { 3028 if (!add_dynamic_entry (DT_DEBUG, 0)) 3029 return FALSE; 3030 } 3031 3032 if (htab->srelplt->size != 0) 3033 { 3034 if (!add_dynamic_entry (DT_PLTRELSZ, 0) 3035 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 3036 || !add_dynamic_entry (DT_JMPREL, 0)) 3037 return FALSE; 3038 } 3039 3040 if (relocs) 3041 { 3042 if (!add_dynamic_entry (DT_RELA, 0) 3043 || !add_dynamic_entry (DT_RELASZ, 0) 3044 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 3045 return FALSE; 3046 3047 /* If any dynamic relocs apply to a read-only section, 3048 then we need a DT_TEXTREL entry. */ 3049 if ((info->flags & DF_TEXTREL) == 0) 3050 elf_link_hash_traverse (&htab->etab, readonly_dynrelocs, info); 3051 3052 if ((info->flags & DF_TEXTREL) != 0) 3053 { 3054 if (!add_dynamic_entry (DT_TEXTREL, 0)) 3055 return FALSE; 3056 } 3057 } 3058 } 3059 #undef add_dynamic_entry 3060 3061 return TRUE; 3062 } 3063 3064 /* Finish up dynamic symbol handling. We set the contents of various 3065 dynamic sections here. */ 3066 3067 static bfd_boolean 3068 elf_metag_finish_dynamic_symbol (bfd *output_bfd, 3069 struct bfd_link_info *info, 3070 struct elf_link_hash_entry *eh, 3071 Elf_Internal_Sym *sym) 3072 { 3073 struct elf_metag_link_hash_table *htab; 3074 Elf_Internal_Rela rel; 3075 bfd_byte *loc; 3076 3077 htab = metag_link_hash_table (info); 3078 3079 if (eh->plt.offset != (bfd_vma) -1) 3080 { 3081 asection *splt; 3082 asection *sgot; 3083 asection *srela; 3084 3085 bfd_vma plt_index; 3086 bfd_vma got_offset; 3087 bfd_vma got_entry; 3088 3089 if (eh->plt.offset & 1) 3090 abort (); 3091 3092 BFD_ASSERT (eh->dynindx != -1); 3093 3094 splt = htab->splt; 3095 sgot = htab->sgotplt; 3096 srela = htab->srelplt; 3097 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 3098 3099 /* Get the index in the procedure linkage table which 3100 corresponds to this symbol. This is the index of this symbol 3101 in all the symbols for which we are making plt entries. The 3102 first entry in the procedure linkage table is reserved. */ 3103 plt_index = eh->plt.offset / PLT_ENTRY_SIZE - 1; 3104 3105 /* Get the offset into the .got.plt table of the entry that 3106 corresponds to this function. */ 3107 got_offset = plt_index * GOT_ENTRY_SIZE; 3108 3109 BFD_ASSERT (got_offset < (1 << 16)); 3110 3111 got_entry = sgot->output_section->vma 3112 + sgot->output_offset 3113 + got_offset; 3114 3115 BFD_ASSERT (plt_index < (1 << 16)); 3116 3117 /* Fill in the entry in the procedure linkage table. */ 3118 if (! bfd_link_pic (info)) 3119 { 3120 bfd_put_32 (output_bfd, 3121 (plt_entry[0] 3122 | (((got_entry >> 16) & 0xffff) << 3)), 3123 splt->contents + eh->plt.offset); 3124 bfd_put_32 (output_bfd, 3125 (plt_entry[1] 3126 | ((got_entry & 0xffff) << 3)), 3127 splt->contents + eh->plt.offset + 4); 3128 bfd_put_32 (output_bfd, plt_entry[2], 3129 splt->contents + eh->plt.offset + 8); 3130 bfd_put_32 (output_bfd, 3131 (plt_entry[3] | (plt_index << 3)), 3132 splt->contents + eh->plt.offset + 12); 3133 bfd_put_32 (output_bfd, 3134 (plt_entry[4] 3135 | ((((unsigned int) ((- (eh->plt.offset + 16)) >> 2)) & 0x7ffff) << 5)), 3136 splt->contents + eh->plt.offset + 16); 3137 } 3138 else 3139 { 3140 bfd_vma addr = got_entry - (splt->output_section->vma + 3141 splt->output_offset + eh->plt.offset); 3142 3143 bfd_put_32 (output_bfd, 3144 plt_pic_entry[0] | (((addr >> 16) & 0xffff) << 3), 3145 splt->contents + eh->plt.offset); 3146 bfd_put_32 (output_bfd, 3147 plt_pic_entry[1] | ((addr & 0xffff) << 3), 3148 splt->contents + eh->plt.offset + 4); 3149 bfd_put_32 (output_bfd, plt_pic_entry[2], 3150 splt->contents + eh->plt.offset + 8); 3151 bfd_put_32 (output_bfd, 3152 (plt_pic_entry[3] | (plt_index << 3)), 3153 splt->contents + eh->plt.offset + 12); 3154 bfd_put_32 (output_bfd, 3155 (plt_pic_entry[4] 3156 + ((((unsigned int) ((- (eh->plt.offset + 16)) >> 2)) & 0x7ffff) << 5)), 3157 splt->contents + eh->plt.offset + 16); 3158 } 3159 3160 /* Fill in the entry in the global offset table. */ 3161 bfd_put_32 (output_bfd, 3162 (splt->output_section->vma 3163 + splt->output_offset 3164 + eh->plt.offset 3165 + 12), /* offset within PLT entry */ 3166 sgot->contents + got_offset); 3167 3168 /* Fill in the entry in the .rela.plt section. */ 3169 rel.r_offset = (sgot->output_section->vma 3170 + sgot->output_offset 3171 + got_offset); 3172 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_JMP_SLOT); 3173 rel.r_addend = 0; 3174 loc = htab->srelplt->contents; 3175 loc += plt_index * sizeof(Elf32_External_Rela); 3176 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc); 3177 3178 if (!eh->def_regular) 3179 { 3180 /* Mark the symbol as undefined, rather than as defined in 3181 the .plt section. Leave the value alone. */ 3182 sym->st_shndx = SHN_UNDEF; 3183 } 3184 } 3185 3186 if (eh->got.offset != (bfd_vma) -1 3187 && (metag_elf_hash_entry (eh)->tls_type & GOT_TLS_GD) == 0 3188 && (metag_elf_hash_entry (eh)->tls_type & GOT_TLS_IE) == 0) 3189 { 3190 /* This symbol has an entry in the global offset table. Set it 3191 up. */ 3192 3193 rel.r_offset = ((eh->got.offset &~ (bfd_vma) 1) 3194 + htab->sgot->output_offset 3195 + htab->sgot->output_section->vma); 3196 3197 /* If this is a -Bsymbolic link and the symbol is defined 3198 locally or was forced to be local because of a version file, 3199 we just want to emit a RELATIVE reloc. The entry in the 3200 global offset table will already have been initialized in the 3201 relocate_section function. */ 3202 if (bfd_link_pic (info) 3203 && (info->symbolic || eh->dynindx == -1) 3204 && eh->def_regular) 3205 { 3206 rel.r_info = ELF32_R_INFO (0, R_METAG_RELATIVE); 3207 rel.r_addend = (eh->root.u.def.value 3208 + eh->root.u.def.section->output_offset 3209 + eh->root.u.def.section->output_section->vma); 3210 } 3211 else 3212 { 3213 if ((eh->got.offset & 1) != 0) 3214 abort (); 3215 bfd_put_32 (output_bfd, 0, htab->sgot->contents + eh->got.offset); 3216 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_GLOB_DAT); 3217 rel.r_addend = 0; 3218 } 3219 3220 loc = htab->srelgot->contents; 3221 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rela); 3222 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc); 3223 } 3224 3225 if (eh->needs_copy) 3226 { 3227 asection *s; 3228 3229 /* This symbol needs a copy reloc. Set it up. */ 3230 3231 if (! (eh->dynindx != -1 3232 && (eh->root.type == bfd_link_hash_defined 3233 || eh->root.type == bfd_link_hash_defweak))) 3234 abort (); 3235 3236 s = htab->srelbss; 3237 3238 rel.r_offset = (eh->root.u.def.value 3239 + eh->root.u.def.section->output_offset 3240 + eh->root.u.def.section->output_section->vma); 3241 rel.r_addend = 0; 3242 rel.r_info = ELF32_R_INFO (eh->dynindx, R_METAG_COPY); 3243 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 3244 bfd_elf32_swap_reloca_out (output_bfd, &rel, loc); 3245 } 3246 3247 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 3248 if (eh->root.root.string[0] == '_' 3249 && (strcmp (eh->root.root.string, "_DYNAMIC") == 0 3250 || eh == htab->etab.hgot)) 3251 { 3252 sym->st_shndx = SHN_ABS; 3253 } 3254 3255 return TRUE; 3256 } 3257 3258 /* Set the Meta ELF ABI version. */ 3259 3260 static void 3261 elf_metag_post_process_headers (bfd * abfd, struct bfd_link_info * link_info) 3262 { 3263 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */ 3264 3265 _bfd_elf_post_process_headers (abfd, link_info); 3266 i_ehdrp = elf_elfheader (abfd); 3267 i_ehdrp->e_ident[EI_ABIVERSION] = METAG_ELF_ABI_VERSION; 3268 } 3269 3270 /* Used to decide how to sort relocs in an optimal manner for the 3271 dynamic linker, before writing them out. */ 3272 3273 static enum elf_reloc_type_class 3274 elf_metag_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 3275 const asection *rel_sec ATTRIBUTE_UNUSED, 3276 const Elf_Internal_Rela *rela) 3277 { 3278 switch ((int) ELF32_R_TYPE (rela->r_info)) 3279 { 3280 case R_METAG_RELATIVE: 3281 return reloc_class_relative; 3282 case R_METAG_JMP_SLOT: 3283 return reloc_class_plt; 3284 case R_METAG_COPY: 3285 return reloc_class_copy; 3286 default: 3287 return reloc_class_normal; 3288 } 3289 } 3290 3291 /* Finish up the dynamic sections. */ 3292 3293 static bfd_boolean 3294 elf_metag_finish_dynamic_sections (bfd *output_bfd, 3295 struct bfd_link_info *info) 3296 { 3297 bfd *dynobj; 3298 struct elf_metag_link_hash_table *htab; 3299 asection *sdyn; 3300 3301 htab = metag_link_hash_table (info); 3302 dynobj = htab->etab.dynobj; 3303 3304 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 3305 3306 if (htab->etab.dynamic_sections_created) 3307 { 3308 asection *splt; 3309 Elf32_External_Dyn *dyncon, *dynconend; 3310 3311 if (sdyn == NULL) 3312 abort (); 3313 3314 dyncon = (Elf32_External_Dyn *) sdyn->contents; 3315 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 3316 for (; dyncon < dynconend; dyncon++) 3317 { 3318 Elf_Internal_Dyn dyn; 3319 asection *s; 3320 3321 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 3322 3323 switch (dyn.d_tag) 3324 { 3325 default: 3326 continue; 3327 3328 case DT_PLTGOT: 3329 s = htab->sgot; 3330 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3331 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3332 break; 3333 3334 case DT_JMPREL: 3335 s = htab->srelplt; 3336 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3337 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3338 break; 3339 3340 case DT_PLTRELSZ: 3341 s = htab->srelplt; 3342 dyn.d_un.d_val = s->size; 3343 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3344 break; 3345 3346 case DT_RELASZ: 3347 /* Don't count procedure linkage table relocs in the 3348 overall reloc count. */ 3349 if (htab->srelplt) { 3350 s = htab->srelplt; 3351 dyn.d_un.d_val -= s->size; 3352 } 3353 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3354 break; 3355 3356 case DT_RELA: 3357 /* We may not be using the standard ELF linker script. 3358 If .rela.plt is the first .rela section, we adjust 3359 DT_RELA to not include it. */ 3360 if (htab->srelplt) { 3361 s = htab->srelplt; 3362 if (dyn.d_un.d_ptr == s->output_section->vma + s->output_offset) 3363 dyn.d_un.d_ptr += s->size; 3364 } 3365 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3366 break; 3367 } 3368 3369 } 3370 3371 /* Fill in the first entry in the procedure linkage table. */ 3372 splt = htab->splt; 3373 if (splt && splt->size > 0) 3374 { 3375 unsigned long addr; 3376 /* addr = .got + 4 */ 3377 addr = htab->sgot->output_section->vma + 3378 htab->sgot->output_offset + 4; 3379 if (bfd_link_pic (info)) 3380 { 3381 addr -= splt->output_section->vma + splt->output_offset; 3382 bfd_put_32 (output_bfd, 3383 plt0_pic_entry[0] | (((addr >> 16) & 0xffff) << 3), 3384 splt->contents); 3385 bfd_put_32 (output_bfd, 3386 plt0_pic_entry[1] | ((addr & 0xffff) << 3), 3387 splt->contents + 4); 3388 bfd_put_32 (output_bfd, plt0_pic_entry[2], splt->contents + 8); 3389 bfd_put_32 (output_bfd, plt0_pic_entry[3], splt->contents + 12); 3390 bfd_put_32 (output_bfd, plt0_pic_entry[4], splt->contents + 16); 3391 } 3392 else 3393 { 3394 bfd_put_32 (output_bfd, 3395 plt0_entry[0] | (((addr >> 16) & 0xffff) << 3), 3396 splt->contents); 3397 bfd_put_32 (output_bfd, 3398 plt0_entry[1] | ((addr & 0xffff) << 3), 3399 splt->contents + 4); 3400 bfd_put_32 (output_bfd, plt0_entry[2], splt->contents + 8); 3401 bfd_put_32 (output_bfd, plt0_entry[3], splt->contents + 12); 3402 bfd_put_32 (output_bfd, plt0_entry[4], splt->contents + 16); 3403 } 3404 3405 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 3406 PLT_ENTRY_SIZE; 3407 } 3408 } 3409 3410 if (htab->sgot != NULL && htab->sgot->size != 0) 3411 { 3412 /* Fill in the first entry in the global offset table. 3413 We use it to point to our dynamic section, if we have one. */ 3414 bfd_put_32 (output_bfd, 3415 sdyn ? sdyn->output_section->vma + sdyn->output_offset : 0, 3416 htab->sgot->contents); 3417 3418 /* The second entry is reserved for use by the dynamic linker. */ 3419 memset (htab->sgot->contents + GOT_ENTRY_SIZE, 0, GOT_ENTRY_SIZE); 3420 3421 /* Set .got entry size. */ 3422 elf_section_data (htab->sgot->output_section) 3423 ->this_hdr.sh_entsize = GOT_ENTRY_SIZE; 3424 } 3425 3426 return TRUE; 3427 } 3428 3429 /* Return the section that should be marked against GC for a given 3430 relocation. */ 3431 3432 static asection * 3433 elf_metag_gc_mark_hook (asection *sec, 3434 struct bfd_link_info *info, 3435 Elf_Internal_Rela *rela, 3436 struct elf_link_hash_entry *hh, 3437 Elf_Internal_Sym *sym) 3438 { 3439 if (hh != NULL) 3440 switch ((unsigned int) ELF32_R_TYPE (rela->r_info)) 3441 { 3442 case R_METAG_GNU_VTINHERIT: 3443 case R_METAG_GNU_VTENTRY: 3444 return NULL; 3445 } 3446 3447 return _bfd_elf_gc_mark_hook (sec, info, rela, hh, sym); 3448 } 3449 3450 /* Update the got and plt entry reference counts for the section being 3451 removed. */ 3452 3453 static bfd_boolean 3454 elf_metag_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, 3455 struct bfd_link_info *info ATTRIBUTE_UNUSED, 3456 asection *sec ATTRIBUTE_UNUSED, 3457 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) 3458 { 3459 Elf_Internal_Shdr *symtab_hdr; 3460 struct elf_link_hash_entry **eh_syms; 3461 bfd_signed_vma *local_got_refcounts; 3462 bfd_signed_vma *local_plt_refcounts; 3463 const Elf_Internal_Rela *rel, *relend; 3464 3465 if (bfd_link_relocatable (info)) 3466 return TRUE; 3467 3468 elf_section_data (sec)->local_dynrel = NULL; 3469 3470 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 3471 eh_syms = elf_sym_hashes (abfd); 3472 local_got_refcounts = elf_local_got_refcounts (abfd); 3473 local_plt_refcounts = local_got_refcounts; 3474 if (local_plt_refcounts != NULL) 3475 local_plt_refcounts += symtab_hdr->sh_info; 3476 3477 relend = relocs + sec->reloc_count; 3478 for (rel = relocs; rel < relend; rel++) 3479 { 3480 unsigned long r_symndx; 3481 unsigned int r_type; 3482 struct elf_link_hash_entry *eh = NULL; 3483 3484 r_symndx = ELF32_R_SYM (rel->r_info); 3485 if (r_symndx >= symtab_hdr->sh_info) 3486 { 3487 struct elf_metag_link_hash_entry *hh; 3488 struct elf_metag_dyn_reloc_entry **hdh_pp; 3489 struct elf_metag_dyn_reloc_entry *hdh_p; 3490 3491 eh = eh_syms[r_symndx - symtab_hdr->sh_info]; 3492 while (eh->root.type == bfd_link_hash_indirect 3493 || eh->root.type == bfd_link_hash_warning) 3494 eh = (struct elf_link_hash_entry *) eh->root.u.i.link; 3495 hh = (struct elf_metag_link_hash_entry *) eh; 3496 3497 for (hdh_pp = &hh->dyn_relocs; (hdh_p = *hdh_pp) != NULL; 3498 hdh_pp = &hdh_p->hdh_next) 3499 if (hdh_p->sec == sec) 3500 { 3501 /* Everything must go for SEC. */ 3502 *hdh_pp = hdh_p->hdh_next; 3503 break; 3504 } 3505 } 3506 3507 r_type = ELF32_R_TYPE (rel->r_info); 3508 switch (r_type) 3509 { 3510 case R_METAG_TLS_LDM: 3511 if (metag_link_hash_table (info)->tls_ldm_got.refcount > 0) 3512 metag_link_hash_table (info)->tls_ldm_got.refcount -= 1; 3513 break; 3514 case R_METAG_TLS_IE: 3515 case R_METAG_TLS_GD: 3516 case R_METAG_GETSET_GOT: 3517 if (eh != NULL) 3518 { 3519 if (eh->got.refcount > 0) 3520 eh->got.refcount -= 1; 3521 } 3522 else if (local_got_refcounts != NULL) 3523 { 3524 if (local_got_refcounts[r_symndx] > 0) 3525 local_got_refcounts[r_symndx] -= 1; 3526 } 3527 break; 3528 3529 case R_METAG_RELBRANCH_PLT: 3530 if (eh != NULL) 3531 { 3532 if (eh->plt.refcount > 0) 3533 eh->plt.refcount -= 1; 3534 } 3535 break; 3536 3537 case R_METAG_ADDR32: 3538 case R_METAG_HIADDR16: 3539 case R_METAG_LOADDR16: 3540 case R_METAG_GETSETOFF: 3541 case R_METAG_RELBRANCH: 3542 if (eh != NULL) 3543 { 3544 struct elf_metag_link_hash_entry *hh; 3545 struct elf_metag_dyn_reloc_entry **hdh_pp; 3546 struct elf_metag_dyn_reloc_entry *hdh_p; 3547 3548 if (!bfd_link_pic (info) && eh->plt.refcount > 0) 3549 eh->plt.refcount -= 1; 3550 3551 hh = (struct elf_metag_link_hash_entry *) eh; 3552 3553 for (hdh_pp = &hh->dyn_relocs; (hdh_p = *hdh_pp) != NULL; 3554 hdh_pp = &hdh_p->hdh_next) 3555 if (hdh_p->sec == sec) 3556 { 3557 if (ELF32_R_TYPE (rel->r_info) == R_METAG_RELBRANCH) 3558 hdh_p->relative_count -= 1; 3559 hdh_p->count -= 1; 3560 if (hdh_p->count == 0) 3561 *hdh_pp = hdh_p->hdh_next; 3562 break; 3563 } 3564 } 3565 break; 3566 3567 default: 3568 break; 3569 } 3570 } 3571 3572 return TRUE; 3573 } 3574 3575 /* Determine the type of stub needed, if any, for a call. */ 3576 3577 static enum elf_metag_stub_type 3578 metag_type_of_stub (asection *input_sec, 3579 const Elf_Internal_Rela *rel, 3580 struct elf_metag_link_hash_entry *hh, 3581 bfd_vma destination, 3582 struct bfd_link_info *info ATTRIBUTE_UNUSED) 3583 { 3584 bfd_vma location; 3585 bfd_vma branch_offset; 3586 bfd_vma max_branch_offset; 3587 3588 if (hh != NULL && 3589 !(hh->eh.root.type == bfd_link_hash_defined 3590 || hh->eh.root.type == bfd_link_hash_defweak)) 3591 return metag_stub_none; 3592 3593 /* Determine where the call point is. */ 3594 location = (input_sec->output_offset 3595 + input_sec->output_section->vma 3596 + rel->r_offset); 3597 3598 branch_offset = destination - location; 3599 3600 /* Determine if a long branch stub is needed. Meta branch offsets 3601 are signed 19 bits 4 byte aligned. */ 3602 max_branch_offset = (1 << (BRANCH_BITS-1)) << 2; 3603 3604 if (branch_offset + max_branch_offset >= 2*max_branch_offset) 3605 { 3606 if (bfd_link_pic (info)) 3607 return metag_stub_long_branch_shared; 3608 else 3609 return metag_stub_long_branch; 3610 } 3611 3612 return metag_stub_none; 3613 } 3614 3615 #define MOVT_A0_3 0x82180005 3616 #define JUMP_A0_3 0xac180003 3617 3618 #define MOVT_A1LBP 0x83080005 3619 #define ADD_A1LBP 0x83080000 3620 3621 #define ADDT_A0_3_CPC 0x82980001 3622 #define ADD_A0_3_A0_3 0x82180000 3623 #define MOV_PC_A0_3 0xa3180ca0 3624 3625 static bfd_boolean 3626 metag_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED) 3627 { 3628 struct elf_metag_stub_hash_entry *hsh; 3629 asection *stub_sec; 3630 bfd *stub_bfd; 3631 bfd_byte *loc; 3632 bfd_vma sym_value; 3633 int size; 3634 3635 /* Massage our args to the form they really have. */ 3636 hsh = (struct elf_metag_stub_hash_entry *) gen_entry; 3637 3638 stub_sec = hsh->stub_sec; 3639 3640 /* Make a note of the offset within the stubs for this entry. */ 3641 hsh->stub_offset = stub_sec->size; 3642 loc = stub_sec->contents + hsh->stub_offset; 3643 3644 stub_bfd = stub_sec->owner; 3645 3646 switch (hsh->stub_type) 3647 { 3648 case metag_stub_long_branch_shared: 3649 /* A PIC long branch stub is an ADDT and an ADD instruction used to 3650 calculate the jump target using A0.3 as a temporary. Then a MOV 3651 to PC carries out the jump. */ 3652 sym_value = (hsh->target_value 3653 + hsh->target_section->output_offset 3654 + hsh->target_section->output_section->vma 3655 + hsh->addend); 3656 3657 sym_value -= (hsh->stub_offset 3658 + stub_sec->output_offset 3659 + stub_sec->output_section->vma); 3660 3661 bfd_put_32 (stub_bfd, ADDT_A0_3_CPC | (((sym_value >> 16) & 0xffff) << 3), 3662 loc); 3663 3664 bfd_put_32 (stub_bfd, ADD_A0_3_A0_3 | ((sym_value & 0xffff) << 3), 3665 loc + 4); 3666 3667 bfd_put_32 (stub_bfd, MOV_PC_A0_3, loc + 8); 3668 3669 size = 12; 3670 break; 3671 case metag_stub_long_branch: 3672 /* A standard long branch stub is a MOVT instruction followed by a 3673 JUMP instruction using the A0.3 register as a temporary. This is 3674 the same method used by the LDLK linker (patch.c). */ 3675 sym_value = (hsh->target_value 3676 + hsh->target_section->output_offset 3677 + hsh->target_section->output_section->vma 3678 + hsh->addend); 3679 3680 bfd_put_32 (stub_bfd, MOVT_A0_3 | (((sym_value >> 16) & 0xffff) << 3), 3681 loc); 3682 3683 bfd_put_32 (stub_bfd, JUMP_A0_3 | ((sym_value & 0xffff) << 3), loc + 4); 3684 3685 size = 8; 3686 break; 3687 default: 3688 BFD_FAIL (); 3689 return FALSE; 3690 } 3691 3692 stub_sec->size += size; 3693 return TRUE; 3694 } 3695 3696 /* As above, but don't actually build the stub. Just bump offset so 3697 we know stub section sizes. */ 3698 3699 static bfd_boolean 3700 metag_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg ATTRIBUTE_UNUSED) 3701 { 3702 struct elf_metag_stub_hash_entry *hsh; 3703 int size = 0; 3704 3705 /* Massage our args to the form they really have. */ 3706 hsh = (struct elf_metag_stub_hash_entry *) gen_entry; 3707 3708 if (hsh->stub_type == metag_stub_long_branch) 3709 size = 8; 3710 else if (hsh->stub_type == metag_stub_long_branch_shared) 3711 size = 12; 3712 3713 hsh->stub_sec->size += size; 3714 return TRUE; 3715 } 3716 3717 /* Set up various things so that we can make a list of input sections 3718 for each output section included in the link. Returns -1 on error, 3719 0 when no stubs will be needed, and 1 on success. */ 3720 3721 int 3722 elf_metag_setup_section_lists (bfd *output_bfd, struct bfd_link_info *info) 3723 { 3724 bfd *input_bfd; 3725 unsigned int bfd_count; 3726 unsigned int top_id, top_index; 3727 asection *section; 3728 asection **input_list, **list; 3729 bfd_size_type amt; 3730 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info); 3731 3732 /* Count the number of input BFDs and find the top input section id. */ 3733 for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; 3734 input_bfd != NULL; 3735 input_bfd = input_bfd->link.next) 3736 { 3737 bfd_count += 1; 3738 for (section = input_bfd->sections; 3739 section != NULL; 3740 section = section->next) 3741 { 3742 if (top_id < section->id) 3743 top_id = section->id; 3744 } 3745 } 3746 3747 htab->bfd_count = bfd_count; 3748 3749 amt = sizeof (struct map_stub) * (top_id + 1); 3750 htab->stub_group = bfd_zmalloc (amt); 3751 if (htab->stub_group == NULL) 3752 return -1; 3753 3754 /* We can't use output_bfd->section_count here to find the top output 3755 section index as some sections may have been removed, and 3756 strip_excluded_output_sections doesn't renumber the indices. */ 3757 for (section = output_bfd->sections, top_index = 0; 3758 section != NULL; 3759 section = section->next) 3760 { 3761 if (top_index < section->index) 3762 top_index = section->index; 3763 } 3764 3765 htab->top_index = top_index; 3766 amt = sizeof (asection *) * (top_index + 1); 3767 input_list = bfd_malloc (amt); 3768 htab->input_list = input_list; 3769 if (input_list == NULL) 3770 return -1; 3771 3772 /* For sections we aren't interested in, mark their entries with a 3773 value we can check later. */ 3774 list = input_list + top_index; 3775 do 3776 *list = bfd_abs_section_ptr; 3777 while (list-- != input_list); 3778 3779 for (section = output_bfd->sections; 3780 section != NULL; 3781 section = section->next) 3782 { 3783 /* FIXME: This is a bit of hack. Currently our .ctors and .dtors 3784 * have PC relative relocs in them but no code flag set. */ 3785 if (((section->flags & SEC_CODE) != 0) || 3786 strcmp(".ctors", section->name) || 3787 strcmp(".dtors", section->name)) 3788 input_list[section->index] = NULL; 3789 } 3790 3791 return 1; 3792 } 3793 3794 /* The linker repeatedly calls this function for each input section, 3795 in the order that input sections are linked into output sections. 3796 Build lists of input sections to determine groupings between which 3797 we may insert linker stubs. */ 3798 3799 void 3800 elf_metag_next_input_section (struct bfd_link_info *info, asection *isec) 3801 { 3802 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info); 3803 3804 if (isec->output_section->index <= htab->top_index) 3805 { 3806 asection **list = htab->input_list + isec->output_section->index; 3807 if (*list != bfd_abs_section_ptr) 3808 { 3809 /* Steal the link_sec pointer for our list. */ 3810 #define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec) 3811 /* This happens to make the list in reverse order, 3812 which is what we want. */ 3813 PREV_SEC (isec) = *list; 3814 *list = isec; 3815 } 3816 } 3817 } 3818 3819 /* See whether we can group stub sections together. Grouping stub 3820 sections may result in fewer stubs. More importantly, we need to 3821 put all .init* and .fini* stubs at the beginning of the .init or 3822 .fini output sections respectively, because glibc splits the 3823 _init and _fini functions into multiple parts. Putting a stub in 3824 the middle of a function is not a good idea. */ 3825 3826 static void 3827 group_sections (struct elf_metag_link_hash_table *htab, 3828 bfd_size_type stub_group_size, 3829 bfd_boolean stubs_always_before_branch) 3830 { 3831 asection **list = htab->input_list + htab->top_index; 3832 do 3833 { 3834 asection *tail = *list; 3835 if (tail == bfd_abs_section_ptr) 3836 continue; 3837 while (tail != NULL) 3838 { 3839 asection *curr; 3840 asection *prev; 3841 bfd_size_type total; 3842 bfd_boolean big_sec; 3843 3844 curr = tail; 3845 total = tail->size; 3846 big_sec = total >= stub_group_size; 3847 3848 while ((prev = PREV_SEC (curr)) != NULL 3849 && ((total += curr->output_offset - prev->output_offset) 3850 < stub_group_size)) 3851 curr = prev; 3852 3853 /* OK, the size from the start of CURR to the end is less 3854 than stub_group_size bytes and thus can be handled by one stub 3855 section. (or the tail section is itself larger than 3856 stub_group_size bytes, in which case we may be toast.) 3857 We should really be keeping track of the total size of 3858 stubs added here, as stubs contribute to the final output 3859 section size. */ 3860 do 3861 { 3862 prev = PREV_SEC (tail); 3863 /* Set up this stub group. */ 3864 htab->stub_group[tail->id].link_sec = curr; 3865 } 3866 while (tail != curr && (tail = prev) != NULL); 3867 3868 /* But wait, there's more! Input sections up to stub_group_size 3869 bytes before the stub section can be handled by it too. 3870 Don't do this if we have a really large section after the 3871 stubs, as adding more stubs increases the chance that 3872 branches may not reach into the stub section. */ 3873 if (!stubs_always_before_branch && !big_sec) 3874 { 3875 total = 0; 3876 while (prev != NULL 3877 && ((total += tail->output_offset - prev->output_offset) 3878 < stub_group_size)) 3879 { 3880 tail = prev; 3881 prev = PREV_SEC (tail); 3882 htab->stub_group[tail->id].link_sec = curr; 3883 } 3884 } 3885 tail = prev; 3886 } 3887 } 3888 while (list-- != htab->input_list); 3889 free (htab->input_list); 3890 #undef PREV_SEC 3891 } 3892 3893 /* Read in all local syms for all input bfds. 3894 Returns -1 on error, 0 otherwise. */ 3895 3896 static int 3897 get_local_syms (bfd *output_bfd ATTRIBUTE_UNUSED, bfd *input_bfd, 3898 struct bfd_link_info *info) 3899 { 3900 unsigned int bfd_indx; 3901 Elf_Internal_Sym *local_syms, **all_local_syms; 3902 int stub_changed = 0; 3903 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info); 3904 3905 /* We want to read in symbol extension records only once. To do this 3906 we need to read in the local symbols in parallel and save them for 3907 later use; so hold pointers to the local symbols in an array. */ 3908 bfd_size_type amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count; 3909 all_local_syms = bfd_zmalloc (amt); 3910 htab->all_local_syms = all_local_syms; 3911 if (all_local_syms == NULL) 3912 return -1; 3913 3914 /* Walk over all the input BFDs, swapping in local symbols. */ 3915 for (bfd_indx = 0; 3916 input_bfd != NULL; 3917 input_bfd = input_bfd->link.next, bfd_indx++) 3918 { 3919 Elf_Internal_Shdr *symtab_hdr; 3920 3921 /* We'll need the symbol table in a second. */ 3922 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 3923 if (symtab_hdr->sh_info == 0) 3924 continue; 3925 3926 /* We need an array of the local symbols attached to the input bfd. */ 3927 local_syms = (Elf_Internal_Sym *) symtab_hdr->contents; 3928 if (local_syms == NULL) 3929 { 3930 local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, 3931 symtab_hdr->sh_info, 0, 3932 NULL, NULL, NULL); 3933 /* Cache them for elf_link_input_bfd. */ 3934 symtab_hdr->contents = (unsigned char *) local_syms; 3935 } 3936 if (local_syms == NULL) 3937 return -1; 3938 3939 all_local_syms[bfd_indx] = local_syms; 3940 } 3941 3942 return stub_changed; 3943 } 3944 3945 /* Determine and set the size of the stub section for a final link. 3946 3947 The basic idea here is to examine all the relocations looking for 3948 PC-relative calls to a target that is unreachable with a "CALLR" 3949 instruction. */ 3950 3951 /* See elf32-hppa.c and elf64-ppc.c. */ 3952 3953 bfd_boolean 3954 elf_metag_size_stubs(bfd *output_bfd, bfd *stub_bfd, 3955 struct bfd_link_info *info, 3956 bfd_signed_vma group_size, 3957 asection * (*add_stub_section) (const char *, asection *), 3958 void (*layout_sections_again) (void)) 3959 { 3960 bfd_size_type stub_group_size; 3961 bfd_boolean stubs_always_before_branch; 3962 bfd_boolean stub_changed; 3963 struct elf_metag_link_hash_table *htab = metag_link_hash_table (info); 3964 3965 /* Stash our params away. */ 3966 htab->stub_bfd = stub_bfd; 3967 htab->add_stub_section = add_stub_section; 3968 htab->layout_sections_again = layout_sections_again; 3969 stubs_always_before_branch = group_size < 0; 3970 if (group_size < 0) 3971 stub_group_size = -group_size; 3972 else 3973 stub_group_size = group_size; 3974 if (stub_group_size == 1) 3975 { 3976 /* Default values. */ 3977 /* FIXME: not sure what these values should be */ 3978 if (stubs_always_before_branch) 3979 { 3980 stub_group_size = (1 << BRANCH_BITS); 3981 } 3982 else 3983 { 3984 stub_group_size = (1 << BRANCH_BITS); 3985 } 3986 } 3987 3988 group_sections (htab, stub_group_size, stubs_always_before_branch); 3989 3990 switch (get_local_syms (output_bfd, info->input_bfds, info)) 3991 { 3992 default: 3993 if (htab->all_local_syms) 3994 goto error_ret_free_local; 3995 return FALSE; 3996 3997 case 0: 3998 stub_changed = FALSE; 3999 break; 4000 4001 case 1: 4002 stub_changed = TRUE; 4003 break; 4004 } 4005 4006 while (1) 4007 { 4008 bfd *input_bfd; 4009 unsigned int bfd_indx; 4010 asection *stub_sec; 4011 4012 for (input_bfd = info->input_bfds, bfd_indx = 0; 4013 input_bfd != NULL; 4014 input_bfd = input_bfd->link.next, bfd_indx++) 4015 { 4016 Elf_Internal_Shdr *symtab_hdr; 4017 asection *section; 4018 Elf_Internal_Sym *local_syms; 4019 4020 /* We'll need the symbol table in a second. */ 4021 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 4022 if (symtab_hdr->sh_info == 0) 4023 continue; 4024 4025 local_syms = htab->all_local_syms[bfd_indx]; 4026 4027 /* Walk over each section attached to the input bfd. */ 4028 for (section = input_bfd->sections; 4029 section != NULL; 4030 section = section->next) 4031 { 4032 Elf_Internal_Rela *internal_relocs, *irelaend, *irela; 4033 4034 /* If there aren't any relocs, then there's nothing more 4035 to do. */ 4036 if ((section->flags & SEC_RELOC) == 0 4037 || section->reloc_count == 0) 4038 continue; 4039 4040 /* If this section is a link-once section that will be 4041 discarded, then don't create any stubs. */ 4042 if (section->output_section == NULL 4043 || section->output_section->owner != output_bfd) 4044 continue; 4045 4046 /* Get the relocs. */ 4047 internal_relocs 4048 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, 4049 info->keep_memory); 4050 if (internal_relocs == NULL) 4051 goto error_ret_free_local; 4052 4053 /* Now examine each relocation. */ 4054 irela = internal_relocs; 4055 irelaend = irela + section->reloc_count; 4056 for (; irela < irelaend; irela++) 4057 { 4058 unsigned int r_type, r_indx; 4059 enum elf_metag_stub_type stub_type; 4060 struct elf_metag_stub_hash_entry *hsh; 4061 asection *sym_sec; 4062 bfd_vma sym_value; 4063 bfd_vma destination; 4064 struct elf_metag_link_hash_entry *hh; 4065 char *stub_name; 4066 const asection *id_sec; 4067 4068 r_type = ELF32_R_TYPE (irela->r_info); 4069 r_indx = ELF32_R_SYM (irela->r_info); 4070 4071 if (r_type >= (unsigned int) R_METAG_MAX) 4072 { 4073 bfd_set_error (bfd_error_bad_value); 4074 error_ret_free_internal: 4075 if (elf_section_data (section)->relocs == NULL) 4076 free (internal_relocs); 4077 goto error_ret_free_local; 4078 } 4079 4080 /* Only look for stubs on CALLR and B instructions. */ 4081 if (!(r_type == (unsigned int) R_METAG_RELBRANCH || 4082 r_type == (unsigned int) R_METAG_RELBRANCH_PLT)) 4083 continue; 4084 4085 /* Now determine the call target, its name, value, 4086 section. */ 4087 sym_sec = NULL; 4088 sym_value = 0; 4089 destination = 0; 4090 hh = NULL; 4091 if (r_indx < symtab_hdr->sh_info) 4092 { 4093 /* It's a local symbol. */ 4094 Elf_Internal_Sym *sym; 4095 Elf_Internal_Shdr *hdr; 4096 unsigned int shndx; 4097 4098 sym = local_syms + r_indx; 4099 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) 4100 sym_value = sym->st_value; 4101 shndx = sym->st_shndx; 4102 if (shndx < elf_numsections (input_bfd)) 4103 { 4104 hdr = elf_elfsections (input_bfd)[shndx]; 4105 sym_sec = hdr->bfd_section; 4106 destination = (sym_value + irela->r_addend 4107 + sym_sec->output_offset 4108 + sym_sec->output_section->vma); 4109 } 4110 } 4111 else 4112 { 4113 /* It's an external symbol. */ 4114 int e_indx; 4115 4116 e_indx = r_indx - symtab_hdr->sh_info; 4117 hh = ((struct elf_metag_link_hash_entry *) 4118 elf_sym_hashes (input_bfd)[e_indx]); 4119 4120 while (hh->eh.root.type == bfd_link_hash_indirect 4121 || hh->eh.root.type == bfd_link_hash_warning) 4122 hh = ((struct elf_metag_link_hash_entry *) 4123 hh->eh.root.u.i.link); 4124 4125 if (hh->eh.root.type == bfd_link_hash_defined 4126 || hh->eh.root.type == bfd_link_hash_defweak) 4127 { 4128 sym_sec = hh->eh.root.u.def.section; 4129 sym_value = hh->eh.root.u.def.value; 4130 if (hh->eh.plt.offset != (bfd_vma) -1 4131 && hh->eh.dynindx != -1 4132 && r_type == (unsigned int) R_METAG_RELBRANCH_PLT) 4133 { 4134 sym_sec = htab->splt; 4135 sym_value = hh->eh.plt.offset; 4136 } 4137 4138 if (sym_sec->output_section != NULL) 4139 destination = (sym_value + irela->r_addend 4140 + sym_sec->output_offset 4141 + sym_sec->output_section->vma); 4142 else 4143 continue; 4144 } 4145 else if (hh->eh.root.type == bfd_link_hash_undefweak) 4146 { 4147 if (! bfd_link_pic (info)) 4148 continue; 4149 } 4150 else if (hh->eh.root.type == bfd_link_hash_undefined) 4151 { 4152 if (! (info->unresolved_syms_in_objects == RM_IGNORE 4153 && (ELF_ST_VISIBILITY (hh->eh.other) 4154 == STV_DEFAULT))) 4155 continue; 4156 } 4157 else 4158 { 4159 bfd_set_error (bfd_error_bad_value); 4160 goto error_ret_free_internal; 4161 } 4162 } 4163 4164 /* Determine what (if any) linker stub is needed. */ 4165 stub_type = metag_type_of_stub (section, irela, hh, 4166 destination, info); 4167 if (stub_type == metag_stub_none) 4168 continue; 4169 4170 /* Support for grouping stub sections. */ 4171 id_sec = htab->stub_group[section->id].link_sec; 4172 4173 /* Get the name of this stub. */ 4174 stub_name = metag_stub_name (id_sec, sym_sec, hh, irela); 4175 if (!stub_name) 4176 goto error_ret_free_internal; 4177 4178 hsh = metag_stub_hash_lookup (&htab->bstab, 4179 stub_name, 4180 FALSE, FALSE); 4181 if (hsh != NULL) 4182 { 4183 /* The proper stub has already been created. */ 4184 free (stub_name); 4185 continue; 4186 } 4187 4188 hsh = metag_add_stub (stub_name, section, htab); 4189 if (hsh == NULL) 4190 { 4191 free (stub_name); 4192 goto error_ret_free_internal; 4193 } 4194 hsh->target_value = sym_value; 4195 hsh->target_section = sym_sec; 4196 hsh->stub_type = stub_type; 4197 hsh->hh = hh; 4198 hsh->addend = irela->r_addend; 4199 stub_changed = TRUE; 4200 } 4201 4202 /* We're done with the internal relocs, free them. */ 4203 if (elf_section_data (section)->relocs == NULL) 4204 free (internal_relocs); 4205 } 4206 } 4207 4208 if (!stub_changed) 4209 break; 4210 4211 /* OK, we've added some stubs. Find out the new size of the 4212 stub sections. */ 4213 for (stub_sec = htab->stub_bfd->sections; 4214 stub_sec != NULL; 4215 stub_sec = stub_sec->next) 4216 stub_sec->size = 0; 4217 4218 bfd_hash_traverse (&htab->bstab, metag_size_one_stub, htab); 4219 4220 /* Ask the linker to do its stuff. */ 4221 (*htab->layout_sections_again) (); 4222 stub_changed = FALSE; 4223 } 4224 4225 free (htab->all_local_syms); 4226 return TRUE; 4227 4228 error_ret_free_local: 4229 free (htab->all_local_syms); 4230 return FALSE; 4231 } 4232 4233 /* Build all the stubs associated with the current output file. The 4234 stubs are kept in a hash table attached to the main linker hash 4235 table. This function is called via metagelf_finish in the linker. */ 4236 4237 bfd_boolean 4238 elf_metag_build_stubs (struct bfd_link_info *info) 4239 { 4240 asection *stub_sec; 4241 struct bfd_hash_table *table; 4242 struct elf_metag_link_hash_table *htab; 4243 4244 htab = metag_link_hash_table (info); 4245 4246 for (stub_sec = htab->stub_bfd->sections; 4247 stub_sec != NULL; 4248 stub_sec = stub_sec->next) 4249 { 4250 bfd_size_type size; 4251 4252 /* Allocate memory to hold the linker stubs. */ 4253 size = stub_sec->size; 4254 stub_sec->contents = bfd_zalloc (htab->stub_bfd, size); 4255 if (stub_sec->contents == NULL && size != 0) 4256 return FALSE; 4257 stub_sec->size = 0; 4258 } 4259 4260 /* Build the stubs as directed by the stub hash table. */ 4261 table = &htab->bstab; 4262 bfd_hash_traverse (table, metag_build_one_stub, info); 4263 4264 return TRUE; 4265 } 4266 4267 /* Return TRUE if SYM represents a local label symbol. */ 4268 4269 static bfd_boolean 4270 elf_metag_is_local_label_name (bfd *abfd ATTRIBUTE_UNUSED, const char *name) 4271 { 4272 if (name[0] == '$' && name[1] == 'L') 4273 return 1; 4274 return _bfd_elf_is_local_label_name (abfd, name); 4275 } 4276 4277 /* Return address for Ith PLT stub in section PLT, for relocation REL 4278 or (bfd_vma) -1 if it should not be included. */ 4279 4280 static bfd_vma 4281 elf_metag_plt_sym_val (bfd_vma i, const asection *plt, 4282 const arelent *rel ATTRIBUTE_UNUSED) 4283 { 4284 return plt->vma + (i + 1) * PLT_ENTRY_SIZE; 4285 } 4286 4287 #define ELF_ARCH bfd_arch_metag 4288 #define ELF_TARGET_ID METAG_ELF_DATA 4289 #define ELF_MACHINE_CODE EM_METAG 4290 #define ELF_MINPAGESIZE 0x1000 4291 #define ELF_MAXPAGESIZE 0x4000 4292 #define ELF_COMMONPAGESIZE 0x1000 4293 4294 #define TARGET_LITTLE_SYM metag_elf32_vec 4295 #define TARGET_LITTLE_NAME "elf32-metag" 4296 4297 #define elf_symbol_leading_char '_' 4298 4299 #define elf_info_to_howto_rel NULL 4300 #define elf_info_to_howto metag_info_to_howto_rela 4301 4302 #define bfd_elf32_bfd_is_local_label_name elf_metag_is_local_label_name 4303 #define bfd_elf32_bfd_link_hash_table_create \ 4304 elf_metag_link_hash_table_create 4305 #define elf_backend_relocate_section elf_metag_relocate_section 4306 #define elf_backend_gc_mark_hook elf_metag_gc_mark_hook 4307 #define elf_backend_gc_sweep_hook elf_metag_gc_sweep_hook 4308 #define elf_backend_check_relocs elf_metag_check_relocs 4309 #define elf_backend_create_dynamic_sections elf_metag_create_dynamic_sections 4310 #define elf_backend_adjust_dynamic_symbol elf_metag_adjust_dynamic_symbol 4311 #define elf_backend_finish_dynamic_symbol elf_metag_finish_dynamic_symbol 4312 #define elf_backend_finish_dynamic_sections elf_metag_finish_dynamic_sections 4313 #define elf_backend_size_dynamic_sections elf_metag_size_dynamic_sections 4314 #define elf_backend_omit_section_dynsym \ 4315 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 4316 #define elf_backend_post_process_headers elf_metag_post_process_headers 4317 #define elf_backend_reloc_type_class elf_metag_reloc_type_class 4318 #define elf_backend_copy_indirect_symbol elf_metag_copy_indirect_symbol 4319 #define elf_backend_plt_sym_val elf_metag_plt_sym_val 4320 4321 #define elf_backend_can_gc_sections 1 4322 #define elf_backend_can_refcount 1 4323 #define elf_backend_got_header_size 12 4324 #define elf_backend_rela_normal 1 4325 #define elf_backend_want_got_sym 0 4326 #define elf_backend_want_plt_sym 0 4327 #define elf_backend_plt_readonly 1 4328 4329 #define bfd_elf32_bfd_reloc_type_lookup metag_reloc_type_lookup 4330 #define bfd_elf32_bfd_reloc_name_lookup metag_reloc_name_lookup 4331 4332 #include "elf32-target.h" 4333
