1 /* Xilinx MicroBlaze-specific support for 32-bit ELF 2 3 Copyright 2009, 2010, 2011, 2012 Free Software Foundation, Inc. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 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 19 Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, 20 Boston, MA 02110-1301, USA. */ 21 22 23 int dbg = 0; 24 25 #include "sysdep.h" 26 #include "bfd.h" 27 #include "bfdlink.h" 28 #include "libbfd.h" 29 #include "elf-bfd.h" 30 #include "elf/microblaze.h" 31 #include <assert.h> 32 33 #define USE_RELA /* Only USE_REL is actually significant, but this is 34 here are a reminder... */ 35 #define INST_WORD_SIZE 4 36 37 static int ro_small_data_pointer = 0; 38 static int rw_small_data_pointer = 0; 39 40 static reloc_howto_type * microblaze_elf_howto_table [(int) R_MICROBLAZE_max]; 41 42 static reloc_howto_type microblaze_elf_howto_raw[] = 43 { 44 /* This reloc does nothing. */ 45 HOWTO (R_MICROBLAZE_NONE, /* Type. */ 46 0, /* Rightshift. */ 47 2, /* Size (0 = byte, 1 = short, 2 = long). */ 48 32, /* Bitsize. */ 49 FALSE, /* PC_relative. */ 50 0, /* Bitpos. */ 51 complain_overflow_bitfield, /* Complain on overflow. */ 52 NULL, /* Special Function. */ 53 "R_MICROBLAZE_NONE", /* Name. */ 54 FALSE, /* Partial Inplace. */ 55 0, /* Source Mask. */ 56 0, /* Dest Mask. */ 57 FALSE), /* PC relative offset? */ 58 59 /* A standard 32 bit relocation. */ 60 HOWTO (R_MICROBLAZE_32, /* Type. */ 61 0, /* Rightshift. */ 62 2, /* Size (0 = byte, 1 = short, 2 = long). */ 63 32, /* Bitsize. */ 64 FALSE, /* PC_relative. */ 65 0, /* Bitpos. */ 66 complain_overflow_bitfield, /* Complain on overflow. */ 67 bfd_elf_generic_reloc,/* Special Function. */ 68 "R_MICROBLAZE_32", /* Name. */ 69 FALSE, /* Partial Inplace. */ 70 0, /* Source Mask. */ 71 0xffffffff, /* Dest Mask. */ 72 FALSE), /* PC relative offset? */ 73 74 /* A standard PCREL 32 bit relocation. */ 75 HOWTO (R_MICROBLAZE_32_PCREL,/* Type. */ 76 0, /* Rightshift. */ 77 2, /* Size (0 = byte, 1 = short, 2 = long). */ 78 32, /* Bitsize. */ 79 TRUE, /* PC_relative. */ 80 0, /* Bitpos. */ 81 complain_overflow_bitfield, /* Complain on overflow. */ 82 bfd_elf_generic_reloc,/* Special Function. */ 83 "R_MICROBLAZE_32_PCREL", /* Name. */ 84 TRUE, /* Partial Inplace. */ 85 0, /* Source Mask. */ 86 0xffffffff, /* Dest Mask. */ 87 TRUE), /* PC relative offset? */ 88 89 /* A 64 bit PCREL relocation. Table-entry not really used. */ 90 HOWTO (R_MICROBLAZE_64_PCREL,/* Type. */ 91 0, /* Rightshift. */ 92 2, /* Size (0 = byte, 1 = short, 2 = long). */ 93 16, /* Bitsize. */ 94 TRUE, /* PC_relative. */ 95 0, /* Bitpos. */ 96 complain_overflow_dont, /* Complain on overflow. */ 97 bfd_elf_generic_reloc,/* Special Function. */ 98 "R_MICROBLAZE_64_PCREL", /* Name. */ 99 FALSE, /* Partial Inplace. */ 100 0, /* Source Mask. */ 101 0x0000ffff, /* Dest Mask. */ 102 TRUE), /* PC relative offset? */ 103 104 /* The low half of a PCREL 32 bit relocation. */ 105 HOWTO (R_MICROBLAZE_32_PCREL_LO, /* Type. */ 106 0, /* Rightshift. */ 107 2, /* Size (0 = byte, 1 = short, 2 = long). */ 108 16, /* Bitsize. */ 109 TRUE, /* PC_relative. */ 110 0, /* Bitpos. */ 111 complain_overflow_signed, /* Complain on overflow. */ 112 bfd_elf_generic_reloc, /* Special Function. */ 113 "R_MICROBLAZE_32_PCREL_LO", /* Name. */ 114 FALSE, /* Partial Inplace. */ 115 0, /* Source Mask. */ 116 0x0000ffff, /* Dest Mask. */ 117 TRUE), /* PC relative offset? */ 118 119 /* A 64 bit relocation. Table entry not really used. */ 120 HOWTO (R_MICROBLAZE_64, /* Type. */ 121 0, /* Rightshift. */ 122 2, /* Size (0 = byte, 1 = short, 2 = long). */ 123 16, /* Bitsize. */ 124 FALSE, /* PC_relative. */ 125 0, /* Bitpos. */ 126 complain_overflow_dont, /* Complain on overflow. */ 127 bfd_elf_generic_reloc,/* Special Function. */ 128 "R_MICROBLAZE_64", /* Name. */ 129 FALSE, /* Partial Inplace. */ 130 0, /* Source Mask. */ 131 0x0000ffff, /* Dest Mask. */ 132 FALSE), /* PC relative offset? */ 133 134 /* The low half of a 32 bit relocation. */ 135 HOWTO (R_MICROBLAZE_32_LO, /* Type. */ 136 0, /* Rightshift. */ 137 2, /* Size (0 = byte, 1 = short, 2 = long). */ 138 16, /* Bitsize. */ 139 FALSE, /* PC_relative. */ 140 0, /* Bitpos. */ 141 complain_overflow_signed, /* Complain on overflow. */ 142 bfd_elf_generic_reloc,/* Special Function. */ 143 "R_MICROBLAZE_32_LO", /* Name. */ 144 FALSE, /* Partial Inplace. */ 145 0, /* Source Mask. */ 146 0x0000ffff, /* Dest Mask. */ 147 FALSE), /* PC relative offset? */ 148 149 /* Read-only small data section relocation. */ 150 HOWTO (R_MICROBLAZE_SRO32, /* Type. */ 151 0, /* Rightshift. */ 152 2, /* Size (0 = byte, 1 = short, 2 = long). */ 153 16, /* Bitsize. */ 154 FALSE, /* PC_relative. */ 155 0, /* Bitpos. */ 156 complain_overflow_bitfield, /* Complain on overflow. */ 157 bfd_elf_generic_reloc,/* Special Function. */ 158 "R_MICROBLAZE_SRO32", /* Name. */ 159 FALSE, /* Partial Inplace. */ 160 0, /* Source Mask. */ 161 0x0000ffff, /* Dest Mask. */ 162 FALSE), /* PC relative offset? */ 163 164 /* Read-write small data area relocation. */ 165 HOWTO (R_MICROBLAZE_SRW32, /* Type. */ 166 0, /* Rightshift. */ 167 2, /* Size (0 = byte, 1 = short, 2 = long). */ 168 16, /* Bitsize. */ 169 FALSE, /* PC_relative. */ 170 0, /* Bitpos. */ 171 complain_overflow_bitfield, /* Complain on overflow. */ 172 bfd_elf_generic_reloc,/* Special Function. */ 173 "R_MICROBLAZE_SRW32", /* Name. */ 174 FALSE, /* Partial Inplace. */ 175 0, /* Source Mask. */ 176 0x0000ffff, /* Dest Mask. */ 177 FALSE), /* PC relative offset? */ 178 179 /* This reloc does nothing. Used for relaxation. */ 180 HOWTO (R_MICROBLAZE_64_NONE, /* Type. */ 181 0, /* Rightshift. */ 182 2, /* Size (0 = byte, 1 = short, 2 = long). */ 183 32, /* Bitsize. */ 184 TRUE, /* PC_relative. */ 185 0, /* Bitpos. */ 186 complain_overflow_bitfield, /* Complain on overflow. */ 187 NULL, /* Special Function. */ 188 "R_MICROBLAZE_64_NONE",/* Name. */ 189 FALSE, /* Partial Inplace. */ 190 0, /* Source Mask. */ 191 0, /* Dest Mask. */ 192 FALSE), /* PC relative offset? */ 193 194 /* Symbol Op Symbol relocation. */ 195 HOWTO (R_MICROBLAZE_32_SYM_OP_SYM, /* Type. */ 196 0, /* Rightshift. */ 197 2, /* Size (0 = byte, 1 = short, 2 = long). */ 198 32, /* Bitsize. */ 199 FALSE, /* PC_relative. */ 200 0, /* Bitpos. */ 201 complain_overflow_bitfield, /* Complain on overflow. */ 202 bfd_elf_generic_reloc,/* Special Function. */ 203 "R_MICROBLAZE_32_SYM_OP_SYM", /* Name. */ 204 FALSE, /* Partial Inplace. */ 205 0, /* Source Mask. */ 206 0xffffffff, /* Dest Mask. */ 207 FALSE), /* PC relative offset? */ 208 209 /* GNU extension to record C++ vtable hierarchy. */ 210 HOWTO (R_MICROBLAZE_GNU_VTINHERIT, /* Type. */ 211 0, /* Rightshift. */ 212 2, /* Size (0 = byte, 1 = short, 2 = long). */ 213 0, /* Bitsize. */ 214 FALSE, /* PC_relative. */ 215 0, /* Bitpos. */ 216 complain_overflow_dont,/* Complain on overflow. */ 217 NULL, /* Special Function. */ 218 "R_MICROBLAZE_GNU_VTINHERIT", /* Name. */ 219 FALSE, /* Partial Inplace. */ 220 0, /* Source Mask. */ 221 0, /* Dest Mask. */ 222 FALSE), /* PC relative offset? */ 223 224 /* GNU extension to record C++ vtable member usage. */ 225 HOWTO (R_MICROBLAZE_GNU_VTENTRY, /* Type. */ 226 0, /* Rightshift. */ 227 2, /* Size (0 = byte, 1 = short, 2 = long). */ 228 0, /* Bitsize. */ 229 FALSE, /* PC_relative. */ 230 0, /* Bitpos. */ 231 complain_overflow_dont,/* Complain on overflow. */ 232 _bfd_elf_rel_vtable_reloc_fn, /* Special Function. */ 233 "R_MICROBLAZE_GNU_VTENTRY", /* Name. */ 234 FALSE, /* Partial Inplace. */ 235 0, /* Source Mask. */ 236 0, /* Dest Mask. */ 237 FALSE), /* PC relative offset? */ 238 239 /* A 64 bit GOTPC relocation. Table-entry not really used. */ 240 HOWTO (R_MICROBLAZE_GOTPC_64, /* Type. */ 241 0, /* Rightshift. */ 242 2, /* Size (0 = byte, 1 = short, 2 = long). */ 243 16, /* Bitsize. */ 244 TRUE, /* PC_relative. */ 245 0, /* Bitpos. */ 246 complain_overflow_dont, /* Complain on overflow. */ 247 bfd_elf_generic_reloc, /* Special Function. */ 248 "R_MICROBLAZE_GOTPC_64", /* Name. */ 249 FALSE, /* Partial Inplace. */ 250 0, /* Source Mask. */ 251 0x0000ffff, /* Dest Mask. */ 252 TRUE), /* PC relative offset? */ 253 254 /* A 64 bit GOT relocation. Table-entry not really used. */ 255 HOWTO (R_MICROBLAZE_GOT_64, /* Type. */ 256 0, /* Rightshift. */ 257 2, /* Size (0 = byte, 1 = short, 2 = long). */ 258 16, /* Bitsize. */ 259 FALSE, /* PC_relative. */ 260 0, /* Bitpos. */ 261 complain_overflow_dont, /* Complain on overflow. */ 262 bfd_elf_generic_reloc,/* Special Function. */ 263 "R_MICROBLAZE_GOT_64",/* Name. */ 264 FALSE, /* Partial Inplace. */ 265 0, /* Source Mask. */ 266 0x0000ffff, /* Dest Mask. */ 267 FALSE), /* PC relative offset? */ 268 269 /* A 64 bit PLT relocation. Table-entry not really used. */ 270 HOWTO (R_MICROBLAZE_PLT_64, /* Type. */ 271 0, /* Rightshift. */ 272 2, /* Size (0 = byte, 1 = short, 2 = long). */ 273 16, /* Bitsize. */ 274 TRUE, /* PC_relative. */ 275 0, /* Bitpos. */ 276 complain_overflow_dont, /* Complain on overflow. */ 277 bfd_elf_generic_reloc,/* Special Function. */ 278 "R_MICROBLAZE_PLT_64",/* Name. */ 279 FALSE, /* Partial Inplace. */ 280 0, /* Source Mask. */ 281 0x0000ffff, /* Dest Mask. */ 282 TRUE), /* PC relative offset? */ 283 284 /* Table-entry not really used. */ 285 HOWTO (R_MICROBLAZE_REL, /* Type. */ 286 0, /* Rightshift. */ 287 2, /* Size (0 = byte, 1 = short, 2 = long). */ 288 16, /* Bitsize. */ 289 TRUE, /* PC_relative. */ 290 0, /* Bitpos. */ 291 complain_overflow_dont, /* Complain on overflow. */ 292 bfd_elf_generic_reloc,/* Special Function. */ 293 "R_MICROBLAZE_REL", /* Name. */ 294 FALSE, /* Partial Inplace. */ 295 0, /* Source Mask. */ 296 0x0000ffff, /* Dest Mask. */ 297 TRUE), /* PC relative offset? */ 298 299 /* Table-entry not really used. */ 300 HOWTO (R_MICROBLAZE_JUMP_SLOT,/* Type. */ 301 0, /* Rightshift. */ 302 2, /* Size (0 = byte, 1 = short, 2 = long). */ 303 16, /* Bitsize. */ 304 TRUE, /* PC_relative. */ 305 0, /* Bitpos. */ 306 complain_overflow_dont, /* Complain on overflow. */ 307 bfd_elf_generic_reloc,/* Special Function. */ 308 "R_MICROBLAZE_JUMP_SLOT", /* Name. */ 309 FALSE, /* Partial Inplace. */ 310 0, /* Source Mask. */ 311 0x0000ffff, /* Dest Mask. */ 312 TRUE), /* PC relative offset? */ 313 314 /* Table-entry not really used. */ 315 HOWTO (R_MICROBLAZE_GLOB_DAT,/* Type. */ 316 0, /* Rightshift. */ 317 2, /* Size (0 = byte, 1 = short, 2 = long). */ 318 16, /* Bitsize. */ 319 TRUE, /* PC_relative. */ 320 0, /* Bitpos. */ 321 complain_overflow_dont, /* Complain on overflow. */ 322 bfd_elf_generic_reloc,/* Special Function. */ 323 "R_MICROBLAZE_GLOB_DAT", /* Name. */ 324 FALSE, /* Partial Inplace. */ 325 0, /* Source Mask. */ 326 0x0000ffff, /* Dest Mask. */ 327 TRUE), /* PC relative offset? */ 328 329 /* A 64 bit GOT relative relocation. Table-entry not really used. */ 330 HOWTO (R_MICROBLAZE_GOTOFF_64, /* Type. */ 331 0, /* Rightshift. */ 332 2, /* Size (0 = byte, 1 = short, 2 = long). */ 333 16, /* Bitsize. */ 334 FALSE, /* PC_relative. */ 335 0, /* Bitpos. */ 336 complain_overflow_dont, /* Complain on overflow. */ 337 bfd_elf_generic_reloc,/* Special Function. */ 338 "R_MICROBLAZE_GOTOFF_64", /* Name. */ 339 FALSE, /* Partial Inplace. */ 340 0, /* Source Mask. */ 341 0x0000ffff, /* Dest Mask. */ 342 FALSE), /* PC relative offset? */ 343 344 /* A 32 bit GOT relative relocation. Table-entry not really used. */ 345 HOWTO (R_MICROBLAZE_GOTOFF_32, /* Type. */ 346 0, /* Rightshift. */ 347 2, /* Size (0 = byte, 1 = short, 2 = long). */ 348 16, /* Bitsize. */ 349 FALSE, /* PC_relative. */ 350 0, /* Bitpos. */ 351 complain_overflow_dont, /* Complain on overflow. */ 352 bfd_elf_generic_reloc, /* Special Function. */ 353 "R_MICROBLAZE_GOTOFF_32", /* Name. */ 354 FALSE, /* Partial Inplace. */ 355 0, /* Source Mask. */ 356 0x0000ffff, /* Dest Mask. */ 357 FALSE), /* PC relative offset? */ 358 359 /* COPY relocation. Table-entry not really used. */ 360 HOWTO (R_MICROBLAZE_COPY, /* Type. */ 361 0, /* Rightshift. */ 362 2, /* Size (0 = byte, 1 = short, 2 = long). */ 363 16, /* Bitsize. */ 364 FALSE, /* PC_relative. */ 365 0, /* Bitpos. */ 366 complain_overflow_dont, /* Complain on overflow. */ 367 bfd_elf_generic_reloc,/* Special Function. */ 368 "R_MICROBLAZE_COPY", /* Name. */ 369 FALSE, /* Partial Inplace. */ 370 0, /* Source Mask. */ 371 0x0000ffff, /* Dest Mask. */ 372 FALSE), /* PC relative offset? */ 373 374 /* Marker relocs for TLS. */ 375 HOWTO (R_MICROBLAZE_TLS, 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_dont, /* complain_on_overflow */ 382 bfd_elf_generic_reloc, /* special_function */ 383 "R_MICROBLAZE_TLS", /* name */ 384 FALSE, /* partial_inplace */ 385 0, /* src_mask */ 386 0x0000ffff, /* dst_mask */ 387 FALSE), /* pcrel_offset */ 388 389 HOWTO (R_MICROBLAZE_TLSGD, 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_dont, /* complain_on_overflow */ 396 bfd_elf_generic_reloc, /* special_function */ 397 "R_MICROBLAZE_TLSGD", /* name */ 398 FALSE, /* partial_inplace */ 399 0, /* src_mask */ 400 0x0000ffff, /* dst_mask */ 401 FALSE), /* pcrel_offset */ 402 403 HOWTO (R_MICROBLAZE_TLSLD, 404 0, /* rightshift */ 405 2, /* size (0 = byte, 1 = short, 2 = long) */ 406 32, /* bitsize */ 407 FALSE, /* pc_relative */ 408 0, /* bitpos */ 409 complain_overflow_dont, /* complain_on_overflow */ 410 bfd_elf_generic_reloc, /* special_function */ 411 "R_MICROBLAZE_TLSLD", /* name */ 412 FALSE, /* partial_inplace */ 413 0, /* src_mask */ 414 0x0000ffff, /* dst_mask */ 415 FALSE), /* pcrel_offset */ 416 417 /* Computes the load module index of the load module that contains the 418 definition of its TLS sym. */ 419 HOWTO (R_MICROBLAZE_TLSDTPMOD32, 420 0, /* rightshift */ 421 2, /* size (0 = byte, 1 = short, 2 = long) */ 422 32, /* bitsize */ 423 FALSE, /* pc_relative */ 424 0, /* bitpos */ 425 complain_overflow_dont, /* complain_on_overflow */ 426 bfd_elf_generic_reloc, /* special_function */ 427 "R_MICROBLAZE_TLSDTPMOD32", /* name */ 428 FALSE, /* partial_inplace */ 429 0, /* src_mask */ 430 0x0000ffff, /* dst_mask */ 431 FALSE), /* pcrel_offset */ 432 433 /* Computes a dtv-relative displacement, the difference between the value 434 of sym+add and the base address of the thread-local storage block that 435 contains the definition of sym, minus 0x8000. Used for initializing GOT */ 436 HOWTO (R_MICROBLAZE_TLSDTPREL32, 437 0, /* rightshift */ 438 2, /* size (0 = byte, 1 = short, 2 = long) */ 439 32, /* bitsize */ 440 FALSE, /* pc_relative */ 441 0, /* bitpos */ 442 complain_overflow_dont, /* complain_on_overflow */ 443 bfd_elf_generic_reloc, /* special_function */ 444 "R_MICROBLAZE_TLSDTPREL32", /* name */ 445 FALSE, /* partial_inplace */ 446 0, /* src_mask */ 447 0x0000ffff, /* dst_mask */ 448 FALSE), /* pcrel_offset */ 449 450 /* Computes a dtv-relative displacement, the difference between the value 451 of sym+add and the base address of the thread-local storage block that 452 contains the definition of sym, minus 0x8000. */ 453 HOWTO (R_MICROBLAZE_TLSDTPREL64, 454 0, /* rightshift */ 455 2, /* size (0 = byte, 1 = short, 2 = long) */ 456 32, /* bitsize */ 457 FALSE, /* pc_relative */ 458 0, /* bitpos */ 459 complain_overflow_dont, /* complain_on_overflow */ 460 bfd_elf_generic_reloc, /* special_function */ 461 "R_MICROBLAZE_TLSDTPREL64", /* name */ 462 FALSE, /* partial_inplace */ 463 0, /* src_mask */ 464 0x0000ffff, /* dst_mask */ 465 FALSE), /* pcrel_offset */ 466 467 /* Computes a tp-relative displacement, the difference between the value of 468 sym+add and the value of the thread pointer (r13). */ 469 HOWTO (R_MICROBLAZE_TLSGOTTPREL32, 470 0, /* rightshift */ 471 2, /* size (0 = byte, 1 = short, 2 = long) */ 472 32, /* bitsize */ 473 FALSE, /* pc_relative */ 474 0, /* bitpos */ 475 complain_overflow_dont, /* complain_on_overflow */ 476 bfd_elf_generic_reloc, /* special_function */ 477 "R_MICROBLAZE_TLSGOTTPREL32", /* name */ 478 FALSE, /* partial_inplace */ 479 0, /* src_mask */ 480 0x0000ffff, /* dst_mask */ 481 FALSE), /* pcrel_offset */ 482 483 /* Computes a tp-relative displacement, the difference between the value of 484 sym+add and the value of the thread pointer (r13). */ 485 HOWTO (R_MICROBLAZE_TLSTPREL32, 486 0, /* rightshift */ 487 2, /* size (0 = byte, 1 = short, 2 = long) */ 488 32, /* bitsize */ 489 FALSE, /* pc_relative */ 490 0, /* bitpos */ 491 complain_overflow_dont, /* complain_on_overflow */ 492 bfd_elf_generic_reloc, /* special_function */ 493 "R_MICROBLAZE_TLSTPREL32", /* name */ 494 FALSE, /* partial_inplace */ 495 0, /* src_mask */ 496 0x0000ffff, /* dst_mask */ 497 FALSE), /* pcrel_offset */ 498 499 }; 500 501 #ifndef NUM_ELEM 502 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0]) 503 #endif 504 505 /* Initialize the microblaze_elf_howto_table, so that linear accesses can be done. */ 506 507 static void 508 microblaze_elf_howto_init (void) 509 { 510 unsigned int i; 511 512 for (i = NUM_ELEM (microblaze_elf_howto_raw); i--;) 513 { 514 unsigned int type; 515 516 type = microblaze_elf_howto_raw[i].type; 517 518 BFD_ASSERT (type < NUM_ELEM (microblaze_elf_howto_table)); 519 520 microblaze_elf_howto_table [type] = & microblaze_elf_howto_raw [i]; 521 } 522 } 523 524 static reloc_howto_type * 525 microblaze_elf_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, 526 bfd_reloc_code_real_type code) 527 { 528 enum elf_microblaze_reloc_type microblaze_reloc = R_MICROBLAZE_NONE; 529 530 switch (code) 531 { 532 case BFD_RELOC_NONE: 533 microblaze_reloc = R_MICROBLAZE_NONE; 534 break; 535 case BFD_RELOC_MICROBLAZE_64_NONE: 536 microblaze_reloc = R_MICROBLAZE_64_NONE; 537 break; 538 case BFD_RELOC_32: 539 microblaze_reloc = R_MICROBLAZE_32; 540 break; 541 /* RVA is treated the same as 32 */ 542 case BFD_RELOC_RVA: 543 microblaze_reloc = R_MICROBLAZE_32; 544 break; 545 case BFD_RELOC_32_PCREL: 546 microblaze_reloc = R_MICROBLAZE_32_PCREL; 547 break; 548 case BFD_RELOC_64_PCREL: 549 microblaze_reloc = R_MICROBLAZE_64_PCREL; 550 break; 551 case BFD_RELOC_MICROBLAZE_32_LO_PCREL: 552 microblaze_reloc = R_MICROBLAZE_32_PCREL_LO; 553 break; 554 case BFD_RELOC_64: 555 microblaze_reloc = R_MICROBLAZE_64; 556 break; 557 case BFD_RELOC_MICROBLAZE_32_LO: 558 microblaze_reloc = R_MICROBLAZE_32_LO; 559 break; 560 case BFD_RELOC_MICROBLAZE_32_ROSDA: 561 microblaze_reloc = R_MICROBLAZE_SRO32; 562 break; 563 case BFD_RELOC_MICROBLAZE_32_RWSDA: 564 microblaze_reloc = R_MICROBLAZE_SRW32; 565 break; 566 case BFD_RELOC_MICROBLAZE_32_SYM_OP_SYM: 567 microblaze_reloc = R_MICROBLAZE_32_SYM_OP_SYM; 568 break; 569 case BFD_RELOC_VTABLE_INHERIT: 570 microblaze_reloc = R_MICROBLAZE_GNU_VTINHERIT; 571 break; 572 case BFD_RELOC_VTABLE_ENTRY: 573 microblaze_reloc = R_MICROBLAZE_GNU_VTENTRY; 574 break; 575 case BFD_RELOC_MICROBLAZE_64_GOTPC: 576 microblaze_reloc = R_MICROBLAZE_GOTPC_64; 577 break; 578 case BFD_RELOC_MICROBLAZE_64_GOT: 579 microblaze_reloc = R_MICROBLAZE_GOT_64; 580 break; 581 case BFD_RELOC_MICROBLAZE_64_PLT: 582 microblaze_reloc = R_MICROBLAZE_PLT_64; 583 break; 584 case BFD_RELOC_MICROBLAZE_64_GOTOFF: 585 microblaze_reloc = R_MICROBLAZE_GOTOFF_64; 586 break; 587 case BFD_RELOC_MICROBLAZE_32_GOTOFF: 588 microblaze_reloc = R_MICROBLAZE_GOTOFF_32; 589 break; 590 case BFD_RELOC_MICROBLAZE_64_TLSGD: 591 microblaze_reloc = R_MICROBLAZE_TLSGD; 592 break; 593 case BFD_RELOC_MICROBLAZE_64_TLSLD: 594 microblaze_reloc = R_MICROBLAZE_TLSLD; 595 break; 596 case BFD_RELOC_MICROBLAZE_32_TLSDTPREL: 597 microblaze_reloc = R_MICROBLAZE_TLSDTPREL32; 598 break; 599 case BFD_RELOC_MICROBLAZE_64_TLSDTPREL: 600 microblaze_reloc = R_MICROBLAZE_TLSDTPREL64; 601 break; 602 case BFD_RELOC_MICROBLAZE_32_TLSDTPMOD: 603 microblaze_reloc = R_MICROBLAZE_TLSDTPMOD32; 604 break; 605 case BFD_RELOC_MICROBLAZE_64_TLSGOTTPREL: 606 microblaze_reloc = R_MICROBLAZE_TLSGOTTPREL32; 607 break; 608 case BFD_RELOC_MICROBLAZE_64_TLSTPREL: 609 microblaze_reloc = R_MICROBLAZE_TLSTPREL32; 610 break; 611 case BFD_RELOC_MICROBLAZE_COPY: 612 microblaze_reloc = R_MICROBLAZE_COPY; 613 break; 614 default: 615 return (reloc_howto_type *) NULL; 616 } 617 618 if (!microblaze_elf_howto_table [R_MICROBLAZE_32]) 619 /* Initialize howto table if needed. */ 620 microblaze_elf_howto_init (); 621 622 return microblaze_elf_howto_table [(int) microblaze_reloc]; 623 }; 624 625 static reloc_howto_type * 626 microblaze_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 627 const char *r_name) 628 { 629 unsigned int i; 630 631 for (i = 0; i < NUM_ELEM (microblaze_elf_howto_raw); i++) 632 if (microblaze_elf_howto_raw[i].name != NULL 633 && strcasecmp (microblaze_elf_howto_raw[i].name, r_name) == 0) 634 return µblaze_elf_howto_raw[i]; 635 636 return NULL; 637 } 638 639 /* Set the howto pointer for a RCE ELF reloc. */ 640 641 static void 642 microblaze_elf_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED, 643 arelent * cache_ptr, 644 Elf_Internal_Rela * dst) 645 { 646 if (!microblaze_elf_howto_table [R_MICROBLAZE_32]) 647 /* Initialize howto table if needed. */ 648 microblaze_elf_howto_init (); 649 650 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_MICROBLAZE_max); 651 652 cache_ptr->howto = microblaze_elf_howto_table [ELF32_R_TYPE (dst->r_info)]; 653 } 654 655 /* Microblaze ELF local labels start with 'L.' or '$L', not '.L'. */ 656 657 static bfd_boolean 658 microblaze_elf_is_local_label_name (bfd *abfd, const char *name) 659 { 660 if (name[0] == 'L' && name[1] == '.') 661 return TRUE; 662 663 if (name[0] == '$' && name[1] == 'L') 664 return TRUE; 665 666 /* With gcc, the labels go back to starting with '.', so we accept 667 the generic ELF local label syntax as well. */ 668 return _bfd_elf_is_local_label_name (abfd, name); 669 } 670 671 /* The microblaze linker (like many others) needs to keep track of 672 the number of relocs that it decides to copy as dynamic relocs in 673 check_relocs for each symbol. This is so that it can later discard 674 them if they are found to be unnecessary. We store the information 675 in a field extending the regular ELF linker hash table. */ 676 677 struct elf32_mb_dyn_relocs 678 { 679 struct elf32_mb_dyn_relocs *next; 680 681 /* The input section of the reloc. */ 682 asection *sec; 683 684 /* Total number of relocs copied for the input section. */ 685 bfd_size_type count; 686 687 /* Number of pc-relative relocs copied for the input section. */ 688 bfd_size_type pc_count; 689 }; 690 691 /* ELF linker hash entry. */ 692 693 struct elf32_mb_link_hash_entry 694 { 695 struct elf_link_hash_entry elf; 696 697 /* Track dynamic relocs copied for this symbol. */ 698 struct elf32_mb_dyn_relocs *dyn_relocs; 699 700 /* TLS Reference Types for the symbol; Updated by check_relocs */ 701 #define TLS_GD 1 /* GD reloc. */ 702 #define TLS_LD 2 /* LD reloc. */ 703 #define TLS_TPREL 4 /* TPREL reloc, => IE. */ 704 #define TLS_DTPREL 8 /* DTPREL reloc, => LD. */ 705 #define TLS_TLS 16 /* Any TLS reloc. */ 706 unsigned char tls_mask; 707 708 }; 709 710 #define IS_TLS_GD(x) (x == (TLS_TLS | TLS_GD)) 711 #define IS_TLS_LD(x) (x == (TLS_TLS | TLS_LD)) 712 #define IS_TLS_DTPREL(x) (x == (TLS_TLS | TLS_DTPREL)) 713 #define IS_TLS_NONE(x) (x == 0) 714 715 #define elf32_mb_hash_entry(ent) ((struct elf32_mb_link_hash_entry *)(ent)) 716 717 /* ELF linker hash table. */ 718 719 struct elf32_mb_link_hash_table 720 { 721 struct elf_link_hash_table elf; 722 723 /* Short-cuts to get to dynamic linker sections. */ 724 asection *sgot; 725 asection *sgotplt; 726 asection *srelgot; 727 asection *splt; 728 asection *srelplt; 729 asection *sdynbss; 730 asection *srelbss; 731 732 /* Small local sym to section mapping cache. */ 733 struct sym_cache sym_sec; 734 735 /* TLS Local Dynamic GOT Entry */ 736 union { 737 bfd_signed_vma refcount; 738 bfd_vma offset; 739 } tlsld_got; 740 }; 741 742 /* Nonzero if this section has TLS related relocations. */ 743 #define has_tls_reloc sec_flg0 744 745 /* Get the ELF linker hash table from a link_info structure. */ 746 747 #define elf32_mb_hash_table(p) \ 748 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 749 == MICROBLAZE_ELF_DATA ? ((struct elf32_mb_link_hash_table *) ((p)->hash)) : NULL) 750 751 /* Create an entry in a microblaze ELF linker hash table. */ 752 753 static struct bfd_hash_entry * 754 link_hash_newfunc (struct bfd_hash_entry *entry, 755 struct bfd_hash_table *table, 756 const char *string) 757 { 758 /* Allocate the structure if it has not already been allocated by a 759 subclass. */ 760 if (entry == NULL) 761 { 762 entry = bfd_hash_allocate (table, 763 sizeof (struct elf32_mb_link_hash_entry)); 764 if (entry == NULL) 765 return entry; 766 } 767 768 /* Call the allocation method of the superclass. */ 769 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 770 if (entry != NULL) 771 { 772 struct elf32_mb_link_hash_entry *eh; 773 774 eh = (struct elf32_mb_link_hash_entry *) entry; 775 eh->dyn_relocs = NULL; 776 eh->tls_mask = 0; 777 } 778 779 return entry; 780 } 781 782 /* Create a mb ELF linker hash table. */ 783 784 static struct bfd_link_hash_table * 785 microblaze_elf_link_hash_table_create (bfd *abfd) 786 { 787 struct elf32_mb_link_hash_table *ret; 788 bfd_size_type amt = sizeof (struct elf32_mb_link_hash_table); 789 790 ret = (struct elf32_mb_link_hash_table *) bfd_zmalloc (amt); 791 if (ret == NULL) 792 return NULL; 793 794 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 795 sizeof (struct elf32_mb_link_hash_entry), 796 MICROBLAZE_ELF_DATA)) 797 { 798 free (ret); 799 return NULL; 800 } 801 802 return &ret->elf.root; 803 } 804 805 /* Set the values of the small data pointers. */ 806 807 static void 808 microblaze_elf_final_sdp (struct bfd_link_info *info) 809 { 810 struct bfd_link_hash_entry *h; 811 812 h = bfd_link_hash_lookup (info->hash, RO_SDA_ANCHOR_NAME, FALSE, FALSE, TRUE); 813 if (h != (struct bfd_link_hash_entry *) NULL 814 && h->type == bfd_link_hash_defined) 815 ro_small_data_pointer = (h->u.def.value 816 + h->u.def.section->output_section->vma 817 + h->u.def.section->output_offset); 818 819 h = bfd_link_hash_lookup (info->hash, RW_SDA_ANCHOR_NAME, FALSE, FALSE, TRUE); 820 if (h != (struct bfd_link_hash_entry *) NULL 821 && h->type == bfd_link_hash_defined) 822 rw_small_data_pointer = (h->u.def.value 823 + h->u.def.section->output_section->vma 824 + h->u.def.section->output_offset); 825 } 826 827 static bfd_vma 828 dtprel_base (struct bfd_link_info *info) 829 { 830 /* If tls_sec is NULL, we should have signalled an error already. */ 831 if (elf_hash_table (info)->tls_sec == NULL) 832 return 0; 833 return elf_hash_table (info)->tls_sec->vma; 834 } 835 836 /* The size of the thread control block. */ 837 #define TCB_SIZE 8 838 839 /* Output a simple dynamic relocation into SRELOC. */ 840 841 static void 842 microblaze_elf_output_dynamic_relocation (bfd *output_bfd, 843 asection *sreloc, 844 unsigned long reloc_index, 845 unsigned long indx, 846 int r_type, 847 bfd_vma offset, 848 bfd_vma addend) 849 { 850 851 Elf_Internal_Rela rel; 852 853 rel.r_info = ELF32_R_INFO (indx, r_type); 854 rel.r_offset = offset; 855 rel.r_addend = addend; 856 857 bfd_elf32_swap_reloca_out (output_bfd, &rel, 858 (sreloc->contents + reloc_index * sizeof (Elf32_External_Rela))); 859 } 860 861 /* This code is taken from elf32-m32r.c 862 There is some attempt to make this function usable for many architectures, 863 both USE_REL and USE_RELA ['twould be nice if such a critter existed], 864 if only to serve as a learning tool. 865 866 The RELOCATE_SECTION function is called by the new ELF backend linker 867 to handle the relocations for a section. 868 869 The relocs are always passed as Rela structures; if the section 870 actually uses Rel structures, the r_addend field will always be 871 zero. 872 873 This function is responsible for adjust the section contents as 874 necessary, and (if using Rela relocs and generating a 875 relocatable output file) adjusting the reloc addend as 876 necessary. 877 878 This function does not have to worry about setting the reloc 879 address or the reloc symbol index. 880 881 LOCAL_SYMS is a pointer to the swapped in local symbols. 882 883 LOCAL_SECTIONS is an array giving the section in the input file 884 corresponding to the st_shndx field of each local symbol. 885 886 The global hash table entry for the global symbols can be found 887 via elf_sym_hashes (input_bfd). 888 889 When generating relocatable output, this function must handle 890 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 891 going to be the section symbol corresponding to the output 892 section, which means that the addend must be adjusted 893 accordingly. */ 894 895 static bfd_boolean 896 microblaze_elf_relocate_section (bfd *output_bfd, 897 struct bfd_link_info *info, 898 bfd *input_bfd, 899 asection *input_section, 900 bfd_byte *contents, 901 Elf_Internal_Rela *relocs, 902 Elf_Internal_Sym *local_syms, 903 asection **local_sections) 904 { 905 struct elf32_mb_link_hash_table *htab; 906 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 907 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); 908 Elf_Internal_Rela *rel, *relend; 909 int endian = (bfd_little_endian (output_bfd)) ? 0 : 2; 910 /* Assume success. */ 911 bfd_boolean ret = TRUE; 912 asection *sreloc; 913 bfd_vma *local_got_offsets; 914 unsigned int tls_type; 915 916 if (!microblaze_elf_howto_table[R_MICROBLAZE_max-1]) 917 microblaze_elf_howto_init (); 918 919 htab = elf32_mb_hash_table (info); 920 if (htab == NULL) 921 return FALSE; 922 923 local_got_offsets = elf_local_got_offsets (input_bfd); 924 925 sreloc = elf_section_data (input_section)->sreloc; 926 927 rel = relocs; 928 relend = relocs + input_section->reloc_count; 929 for (; rel < relend; rel++) 930 { 931 int r_type; 932 reloc_howto_type *howto; 933 unsigned long r_symndx; 934 bfd_vma addend = rel->r_addend; 935 bfd_vma offset = rel->r_offset; 936 struct elf_link_hash_entry *h; 937 Elf_Internal_Sym *sym; 938 asection *sec; 939 const char *sym_name; 940 bfd_reloc_status_type r = bfd_reloc_ok; 941 const char *errmsg = NULL; 942 bfd_boolean unresolved_reloc = FALSE; 943 944 h = NULL; 945 r_type = ELF32_R_TYPE (rel->r_info); 946 tls_type = 0; 947 948 if (r_type < 0 || r_type >= (int) R_MICROBLAZE_max) 949 { 950 (*_bfd_error_handler) (_("%s: unknown relocation type %d"), 951 bfd_get_filename (input_bfd), (int) r_type); 952 bfd_set_error (bfd_error_bad_value); 953 ret = FALSE; 954 continue; 955 } 956 957 howto = microblaze_elf_howto_table[r_type]; 958 r_symndx = ELF32_R_SYM (rel->r_info); 959 960 if (info->relocatable) 961 { 962 /* This is a relocatable link. We don't have to change 963 anything, unless the reloc is against a section symbol, 964 in which case we have to adjust according to where the 965 section symbol winds up in the output section. */ 966 sec = NULL; 967 if (r_symndx >= symtab_hdr->sh_info) 968 /* External symbol. */ 969 continue; 970 971 /* Local symbol. */ 972 sym = local_syms + r_symndx; 973 sym_name = "<local symbol>"; 974 /* STT_SECTION: symbol is associated with a section. */ 975 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) 976 /* Symbol isn't associated with a section. Nothing to do. */ 977 continue; 978 979 sec = local_sections[r_symndx]; 980 addend += sec->output_offset + sym->st_value; 981 #ifndef USE_REL 982 /* This can't be done for USE_REL because it doesn't mean anything 983 and elf_link_input_bfd asserts this stays zero. */ 984 /* rel->r_addend = addend; */ 985 #endif 986 987 #ifndef USE_REL 988 /* Addends are stored with relocs. We're done. */ 989 continue; 990 #else /* USE_REL */ 991 /* If partial_inplace, we need to store any additional addend 992 back in the section. */ 993 if (!howto->partial_inplace) 994 continue; 995 /* ??? Here is a nice place to call a special_function like handler. */ 996 r = _bfd_relocate_contents (howto, input_bfd, addend, 997 contents + offset); 998 #endif /* USE_REL */ 999 } 1000 else 1001 { 1002 bfd_vma relocation; 1003 1004 /* This is a final link. */ 1005 sym = NULL; 1006 sec = NULL; 1007 unresolved_reloc = FALSE; 1008 1009 if (r_symndx < symtab_hdr->sh_info) 1010 { 1011 /* Local symbol. */ 1012 sym = local_syms + r_symndx; 1013 sec = local_sections[r_symndx]; 1014 if (sec == 0) 1015 continue; 1016 sym_name = "<local symbol>"; 1017 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1018 /* r_addend may have changed if the reference section was 1019 a merge section. */ 1020 addend = rel->r_addend; 1021 } 1022 else 1023 { 1024 /* External symbol. */ 1025 bfd_boolean warned ATTRIBUTE_UNUSED; 1026 1027 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1028 r_symndx, symtab_hdr, sym_hashes, 1029 h, sec, relocation, 1030 unresolved_reloc, warned); 1031 sym_name = h->root.root.string; 1032 } 1033 1034 /* Sanity check the address. */ 1035 if (offset > bfd_get_section_limit (input_bfd, input_section)) 1036 { 1037 r = bfd_reloc_outofrange; 1038 goto check_reloc; 1039 } 1040 1041 switch ((int) r_type) 1042 { 1043 case (int) R_MICROBLAZE_SRO32 : 1044 { 1045 const char *name; 1046 1047 /* Only relocate if the symbol is defined. */ 1048 if (sec) 1049 { 1050 name = bfd_get_section_name (sec->owner, sec); 1051 1052 if (strcmp (name, ".sdata2") == 0 1053 || strcmp (name, ".sbss2") == 0) 1054 { 1055 if (ro_small_data_pointer == 0) 1056 microblaze_elf_final_sdp (info); 1057 if (ro_small_data_pointer == 0) 1058 { 1059 ret = FALSE; 1060 r = bfd_reloc_undefined; 1061 goto check_reloc; 1062 } 1063 1064 /* At this point `relocation' contains the object's 1065 address. */ 1066 relocation -= ro_small_data_pointer; 1067 /* Now it contains the offset from _SDA2_BASE_. */ 1068 r = _bfd_final_link_relocate (howto, input_bfd, 1069 input_section, 1070 contents, offset, 1071 relocation, addend); 1072 } 1073 else 1074 { 1075 (*_bfd_error_handler) (_("%s: The target (%s) of an %s relocation is in the wrong section (%s)"), 1076 bfd_get_filename (input_bfd), 1077 sym_name, 1078 microblaze_elf_howto_table[(int) r_type]->name, 1079 bfd_get_section_name (sec->owner, sec)); 1080 /*bfd_set_error (bfd_error_bad_value); ??? why? */ 1081 ret = FALSE; 1082 continue; 1083 } 1084 } 1085 } 1086 break; 1087 1088 case (int) R_MICROBLAZE_SRW32 : 1089 { 1090 const char *name; 1091 1092 /* Only relocate if the symbol is defined. */ 1093 if (sec) 1094 { 1095 name = bfd_get_section_name (sec->owner, sec); 1096 1097 if (strcmp (name, ".sdata") == 0 1098 || strcmp (name, ".sbss") == 0) 1099 { 1100 if (rw_small_data_pointer == 0) 1101 microblaze_elf_final_sdp (info); 1102 if (rw_small_data_pointer == 0) 1103 { 1104 ret = FALSE; 1105 r = bfd_reloc_undefined; 1106 goto check_reloc; 1107 } 1108 1109 /* At this point `relocation' contains the object's 1110 address. */ 1111 relocation -= rw_small_data_pointer; 1112 /* Now it contains the offset from _SDA_BASE_. */ 1113 r = _bfd_final_link_relocate (howto, input_bfd, 1114 input_section, 1115 contents, offset, 1116 relocation, addend); 1117 } 1118 else 1119 { 1120 (*_bfd_error_handler) (_("%s: The target (%s) of an %s relocation is in the wrong section (%s)"), 1121 bfd_get_filename (input_bfd), 1122 sym_name, 1123 microblaze_elf_howto_table[(int) r_type]->name, 1124 bfd_get_section_name (sec->owner, sec)); 1125 /*bfd_set_error (bfd_error_bad_value); ??? why? */ 1126 ret = FALSE; 1127 continue; 1128 } 1129 } 1130 } 1131 break; 1132 1133 case (int) R_MICROBLAZE_32_SYM_OP_SYM: 1134 break; /* Do nothing. */ 1135 1136 case (int) R_MICROBLAZE_GOTPC_64: 1137 relocation = htab->sgotplt->output_section->vma 1138 + htab->sgotplt->output_offset; 1139 relocation -= (input_section->output_section->vma 1140 + input_section->output_offset 1141 + offset + INST_WORD_SIZE); 1142 relocation += addend; 1143 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff, 1144 contents + offset + endian); 1145 bfd_put_16 (input_bfd, relocation & 0xffff, 1146 contents + offset + endian + INST_WORD_SIZE); 1147 break; 1148 1149 case (int) R_MICROBLAZE_PLT_64: 1150 { 1151 bfd_vma immediate; 1152 if (htab->splt != NULL && h != NULL 1153 && h->plt.offset != (bfd_vma) -1) 1154 { 1155 relocation = (htab->splt->output_section->vma 1156 + htab->splt->output_offset 1157 + h->plt.offset); 1158 unresolved_reloc = FALSE; 1159 immediate = relocation - (input_section->output_section->vma 1160 + input_section->output_offset 1161 + offset + INST_WORD_SIZE); 1162 bfd_put_16 (input_bfd, (immediate >> 16) & 0xffff, 1163 contents + offset + endian); 1164 bfd_put_16 (input_bfd, immediate & 0xffff, 1165 contents + offset + endian + INST_WORD_SIZE); 1166 } 1167 else 1168 { 1169 relocation -= (input_section->output_section->vma 1170 + input_section->output_offset 1171 + offset + INST_WORD_SIZE); 1172 immediate = relocation; 1173 bfd_put_16 (input_bfd, (immediate >> 16) & 0xffff, 1174 contents + offset + endian); 1175 bfd_put_16 (input_bfd, immediate & 0xffff, 1176 contents + offset + endian + INST_WORD_SIZE); 1177 } 1178 break; 1179 } 1180 1181 case (int) R_MICROBLAZE_TLSGD: 1182 tls_type = (TLS_TLS | TLS_GD); 1183 goto dogot; 1184 case (int) R_MICROBLAZE_TLSLD: 1185 tls_type = (TLS_TLS | TLS_LD); 1186 dogot: 1187 case (int) R_MICROBLAZE_GOT_64: 1188 { 1189 bfd_vma *offp; 1190 bfd_vma off, off2; 1191 unsigned long indx; 1192 bfd_vma static_value; 1193 1194 bfd_boolean need_relocs = FALSE; 1195 if (htab->sgot == NULL) 1196 abort (); 1197 1198 indx = 0; 1199 offp = NULL; 1200 1201 /* 1. Identify GOT Offset; 1202 2. Compute Static Values 1203 3. Process Module Id, Process Offset 1204 4. Fixup Relocation with GOT offset value. */ 1205 1206 /* 1. Determine GOT Offset to use : TLS_LD, global, local */ 1207 if (IS_TLS_LD (tls_type)) 1208 offp = &htab->tlsld_got.offset; 1209 else if (h != NULL) 1210 { 1211 if (htab->sgotplt != NULL && h->got.offset != (bfd_vma) -1) 1212 offp = &h->got.offset; 1213 else 1214 abort (); 1215 } 1216 else 1217 { 1218 if (local_got_offsets == NULL) 1219 abort (); 1220 offp = &local_got_offsets[r_symndx]; 1221 } 1222 1223 if (!offp) 1224 abort (); 1225 1226 off = (*offp) & ~1; 1227 off2 = off; 1228 1229 if (IS_TLS_LD(tls_type) || IS_TLS_GD(tls_type)) 1230 off2 = off + 4; 1231 1232 /* Symbol index to use for relocs */ 1233 if (h != NULL) 1234 { 1235 bfd_boolean dyn = 1236 elf_hash_table (info)->dynamic_sections_created; 1237 1238 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 1239 && (!info->shared || !SYMBOL_REFERENCES_LOCAL (info, h))) 1240 indx = h->dynindx; 1241 } 1242 1243 /* Need to generate relocs ? */ 1244 if ((info->shared || indx != 0) 1245 && (h == NULL 1246 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1247 || h->root.type != bfd_link_hash_undefweak)) 1248 need_relocs = TRUE; 1249 1250 /* 2. Compute/Emit Static value of r-expression */ 1251 static_value = relocation + addend; 1252 1253 /* 3. Process module-id and offset */ 1254 if (! ((*offp) & 1) ) 1255 { 1256 bfd_vma got_offset; 1257 1258 got_offset = (htab->sgot->output_section->vma 1259 + htab->sgot->output_offset 1260 + off); 1261 1262 /* Process module-id */ 1263 if (IS_TLS_LD(tls_type)) 1264 { 1265 if (! info->shared) 1266 { 1267 bfd_put_32 (output_bfd, 1, htab->sgot->contents + off); 1268 } 1269 else 1270 { 1271 microblaze_elf_output_dynamic_relocation (output_bfd, 1272 htab->srelgot, htab->srelgot->reloc_count++, 1273 /* symindex= */ 0, R_MICROBLAZE_TLSDTPMOD32, 1274 got_offset, 0); 1275 } 1276 } 1277 else if (IS_TLS_GD(tls_type)) 1278 { 1279 if (! need_relocs) 1280 { 1281 bfd_put_32 (output_bfd, 1, htab->sgot->contents + off); 1282 } 1283 else 1284 { 1285 microblaze_elf_output_dynamic_relocation (output_bfd, 1286 htab->srelgot, 1287 htab->srelgot->reloc_count++, 1288 /* symindex= */ indx, R_MICROBLAZE_TLSDTPMOD32, 1289 got_offset, indx ? 0 : static_value); 1290 } 1291 } 1292 1293 /* Process Offset */ 1294 if (htab->srelgot == NULL) 1295 abort (); 1296 1297 got_offset = (htab->sgot->output_section->vma 1298 + htab->sgot->output_offset 1299 + off2); 1300 if (IS_TLS_LD(tls_type)) 1301 { 1302 /* For LD, offset should be 0 */ 1303 *offp |= 1; 1304 bfd_put_32 (output_bfd, 0, htab->sgot->contents + off2); 1305 } 1306 else if (IS_TLS_GD(tls_type)) 1307 { 1308 *offp |= 1; 1309 static_value -= dtprel_base(info); 1310 if (need_relocs) 1311 { 1312 microblaze_elf_output_dynamic_relocation (output_bfd, 1313 htab->srelgot, htab->srelgot->reloc_count++, 1314 /* symindex= */ indx, R_MICROBLAZE_TLSDTPREL32, 1315 got_offset, indx ? 0 : static_value); 1316 } 1317 else 1318 { 1319 bfd_put_32 (output_bfd, static_value, 1320 htab->sgot->contents + off2); 1321 } 1322 } 1323 else 1324 { 1325 bfd_put_32 (output_bfd, static_value, 1326 htab->sgot->contents + off2); 1327 1328 /* Relocs for dyn symbols generated by 1329 finish_dynamic_symbols */ 1330 if (info->shared && h == NULL) 1331 { 1332 *offp |= 1; 1333 microblaze_elf_output_dynamic_relocation (output_bfd, 1334 htab->srelgot, htab->srelgot->reloc_count++, 1335 /* symindex= */ indx, R_MICROBLAZE_REL, 1336 got_offset, static_value); 1337 } 1338 } 1339 } 1340 1341 /* 4. Fixup Relocation with GOT offset value 1342 Compute relative address of GOT entry for applying 1343 the current relocation */ 1344 relocation = htab->sgot->output_section->vma 1345 + htab->sgot->output_offset 1346 + off 1347 - htab->sgotplt->output_section->vma 1348 - htab->sgotplt->output_offset; 1349 1350 /* Apply Current Relocation */ 1351 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff, 1352 contents + offset + endian); 1353 bfd_put_16 (input_bfd, relocation & 0xffff, 1354 contents + offset + endian + INST_WORD_SIZE); 1355 1356 unresolved_reloc = FALSE; 1357 break; 1358 } 1359 1360 case (int) R_MICROBLAZE_GOTOFF_64: 1361 { 1362 bfd_vma immediate; 1363 unsigned short lo, high; 1364 relocation += addend; 1365 relocation -= htab->sgotplt->output_section->vma 1366 + htab->sgotplt->output_offset; 1367 /* Write this value into correct location. */ 1368 immediate = relocation; 1369 lo = immediate & 0x0000ffff; 1370 high = (immediate >> 16) & 0x0000ffff; 1371 bfd_put_16 (input_bfd, high, contents + offset + endian); 1372 bfd_put_16 (input_bfd, lo, contents + offset + INST_WORD_SIZE + endian); 1373 break; 1374 } 1375 1376 case (int) R_MICROBLAZE_GOTOFF_32: 1377 { 1378 relocation += addend; 1379 relocation -= htab->sgotplt->output_section->vma 1380 + htab->sgotplt->output_offset; 1381 /* Write this value into correct location. */ 1382 bfd_put_32 (input_bfd, relocation, contents + offset); 1383 break; 1384 } 1385 1386 case (int) R_MICROBLAZE_TLSDTPREL64: 1387 relocation += addend; 1388 relocation -= dtprel_base(info); 1389 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff, 1390 contents + offset + 2); 1391 bfd_put_16 (input_bfd, relocation & 0xffff, 1392 contents + offset + 2 + INST_WORD_SIZE); 1393 break; 1394 case (int) R_MICROBLAZE_64_PCREL : 1395 case (int) R_MICROBLAZE_64: 1396 case (int) R_MICROBLAZE_32: 1397 { 1398 /* r_symndx will be STN_UNDEF (zero) only for relocs against symbols 1399 from removed linkonce sections, or sections discarded by 1400 a linker script. */ 1401 if (r_symndx == STN_UNDEF || (input_section->flags & SEC_ALLOC) == 0) 1402 { 1403 relocation += addend; 1404 if (r_type == R_MICROBLAZE_32) 1405 bfd_put_32 (input_bfd, relocation, contents + offset); 1406 else 1407 { 1408 if (r_type == R_MICROBLAZE_64_PCREL) 1409 relocation -= (input_section->output_section->vma 1410 + input_section->output_offset 1411 + offset + INST_WORD_SIZE); 1412 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff, 1413 contents + offset + endian); 1414 bfd_put_16 (input_bfd, relocation & 0xffff, 1415 contents + offset + endian + INST_WORD_SIZE); 1416 } 1417 break; 1418 } 1419 1420 if ((info->shared 1421 && (h == NULL 1422 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1423 || h->root.type != bfd_link_hash_undefweak) 1424 && (!howto->pc_relative 1425 || (h != NULL 1426 && h->dynindx != -1 1427 && (!info->symbolic 1428 || !h->def_regular)))) 1429 || (!info->shared 1430 && h != NULL 1431 && h->dynindx != -1 1432 && !h->non_got_ref 1433 && ((h->def_dynamic 1434 && !h->def_regular) 1435 || h->root.type == bfd_link_hash_undefweak 1436 || h->root.type == bfd_link_hash_undefined))) 1437 { 1438 Elf_Internal_Rela outrel; 1439 bfd_byte *loc; 1440 bfd_boolean skip; 1441 1442 /* When generating a shared object, these relocations 1443 are copied into the output file to be resolved at run 1444 time. */ 1445 1446 BFD_ASSERT (sreloc != NULL); 1447 1448 skip = FALSE; 1449 1450 outrel.r_offset = 1451 _bfd_elf_section_offset (output_bfd, info, input_section, 1452 rel->r_offset); 1453 if (outrel.r_offset == (bfd_vma) -1) 1454 skip = TRUE; 1455 else if (outrel.r_offset == (bfd_vma) -2) 1456 skip = TRUE; 1457 outrel.r_offset += (input_section->output_section->vma 1458 + input_section->output_offset); 1459 1460 if (skip) 1461 memset (&outrel, 0, sizeof outrel); 1462 /* h->dynindx may be -1 if the symbol was marked to 1463 become local. */ 1464 else if (h != NULL 1465 && ((! info->symbolic && h->dynindx != -1) 1466 || !h->def_regular)) 1467 { 1468 BFD_ASSERT (h->dynindx != -1); 1469 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1470 outrel.r_addend = addend; 1471 } 1472 else 1473 { 1474 if (r_type == R_MICROBLAZE_32) 1475 { 1476 outrel.r_info = ELF32_R_INFO (0, R_MICROBLAZE_REL); 1477 outrel.r_addend = relocation + addend; 1478 } 1479 else 1480 { 1481 BFD_FAIL (); 1482 (*_bfd_error_handler) 1483 (_("%B: probably compiled without -fPIC?"), 1484 input_bfd); 1485 bfd_set_error (bfd_error_bad_value); 1486 return FALSE; 1487 } 1488 } 1489 1490 loc = sreloc->contents; 1491 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1492 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1493 break; 1494 } 1495 else 1496 { 1497 relocation += addend; 1498 if (r_type == R_MICROBLAZE_32) 1499 bfd_put_32 (input_bfd, relocation, contents + offset); 1500 else 1501 { 1502 if (r_type == R_MICROBLAZE_64_PCREL) 1503 relocation -= (input_section->output_section->vma 1504 + input_section->output_offset 1505 + offset + INST_WORD_SIZE); 1506 bfd_put_16 (input_bfd, (relocation >> 16) & 0xffff, 1507 contents + offset + endian); 1508 bfd_put_16 (input_bfd, relocation & 0xffff, 1509 contents + offset + endian + INST_WORD_SIZE); 1510 } 1511 break; 1512 } 1513 } 1514 1515 default : 1516 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1517 contents, offset, 1518 relocation, addend); 1519 break; 1520 } 1521 } 1522 1523 check_reloc: 1524 1525 if (r != bfd_reloc_ok) 1526 { 1527 /* FIXME: This should be generic enough to go in a utility. */ 1528 const char *name; 1529 1530 if (h != NULL) 1531 name = h->root.root.string; 1532 else 1533 { 1534 name = (bfd_elf_string_from_elf_section 1535 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 1536 if (name == NULL || *name == '\0') 1537 name = bfd_section_name (input_bfd, sec); 1538 } 1539 1540 if (errmsg != NULL) 1541 goto common_error; 1542 1543 switch (r) 1544 { 1545 case bfd_reloc_overflow: 1546 if (!((*info->callbacks->reloc_overflow) 1547 (info, (h ? &h->root : NULL), name, howto->name, 1548 (bfd_vma) 0, input_bfd, input_section, offset))) 1549 return FALSE; 1550 break; 1551 1552 case bfd_reloc_undefined: 1553 if (!((*info->callbacks->undefined_symbol) 1554 (info, name, input_bfd, input_section, offset, TRUE))) 1555 return FALSE; 1556 break; 1557 1558 case bfd_reloc_outofrange: 1559 errmsg = _("internal error: out of range error"); 1560 goto common_error; 1561 1562 case bfd_reloc_notsupported: 1563 errmsg = _("internal error: unsupported relocation error"); 1564 goto common_error; 1565 1566 case bfd_reloc_dangerous: 1567 errmsg = _("internal error: dangerous error"); 1568 goto common_error; 1569 1570 default: 1571 errmsg = _("internal error: unknown error"); 1572 /* Fall through. */ 1573 common_error: 1574 if (!((*info->callbacks->warning) 1575 (info, errmsg, name, input_bfd, input_section, offset))) 1576 return FALSE; 1577 break; 1578 } 1579 } 1580 } 1581 1582 return ret; 1583 } 1584 1585 /* Merge backend specific data from an object file to the output 1586 object file when linking. 1587 1588 Note: We only use this hook to catch endian mismatches. */ 1589 static bfd_boolean 1590 microblaze_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd) 1591 { 1592 /* Check if we have the same endianess. */ 1593 if (! _bfd_generic_verify_endian_match (ibfd, obfd)) 1594 return FALSE; 1595 1596 return TRUE; 1597 } 1598 1599 1600 /* Calculate fixup value for reference. */ 1601 1602 static int 1603 calc_fixup (bfd_vma start, bfd_vma size, asection *sec) 1604 { 1605 bfd_vma end = start + size; 1606 int i, fixup = 0; 1607 1608 if (sec == NULL || sec->relax == NULL) 1609 return 0; 1610 1611 /* Look for addr in relax table, total fixup value. */ 1612 for (i = 0; i < sec->relax_count; i++) 1613 { 1614 if (end <= sec->relax[i].addr) 1615 break; 1616 if ((end != start) && (start > sec->relax[i].addr)) 1617 continue; 1618 fixup += sec->relax[i].size; 1619 } 1620 return fixup; 1621 } 1622 1623 /* Read-modify-write into the bfd, an immediate value into appropriate fields of 1624 a 32-bit instruction. */ 1625 static void 1626 microblaze_bfd_write_imm_value_32 (bfd *abfd, bfd_byte *bfd_addr, bfd_vma val) 1627 { 1628 unsigned long instr = bfd_get_32 (abfd, bfd_addr); 1629 instr &= ~0x0000ffff; 1630 instr |= (val & 0x0000ffff); 1631 bfd_put_32 (abfd, instr, bfd_addr); 1632 } 1633 1634 /* Read-modify-write into the bfd, an immediate value into appropriate fields of 1635 two consecutive 32-bit instructions. */ 1636 static void 1637 microblaze_bfd_write_imm_value_64 (bfd *abfd, bfd_byte *bfd_addr, bfd_vma val) 1638 { 1639 unsigned long instr_hi; 1640 unsigned long instr_lo; 1641 1642 instr_hi = bfd_get_32 (abfd, bfd_addr); 1643 instr_hi &= ~0x0000ffff; 1644 instr_hi |= ((val >> 16) & 0x0000ffff); 1645 bfd_put_32 (abfd, instr_hi, bfd_addr); 1646 1647 instr_lo = bfd_get_32 (abfd, bfd_addr + INST_WORD_SIZE); 1648 instr_lo &= ~0x0000ffff; 1649 instr_lo |= (val & 0x0000ffff); 1650 bfd_put_32 (abfd, instr_lo, bfd_addr + INST_WORD_SIZE); 1651 } 1652 1653 static bfd_boolean 1654 microblaze_elf_relax_section (bfd *abfd, 1655 asection *sec, 1656 struct bfd_link_info *link_info, 1657 bfd_boolean *again) 1658 { 1659 Elf_Internal_Shdr *symtab_hdr; 1660 Elf_Internal_Rela *internal_relocs; 1661 Elf_Internal_Rela *free_relocs = NULL; 1662 Elf_Internal_Rela *irel, *irelend; 1663 bfd_byte *contents = NULL; 1664 bfd_byte *free_contents = NULL; 1665 int rel_count; 1666 unsigned int shndx; 1667 int i, sym_index; 1668 asection *o; 1669 struct elf_link_hash_entry *sym_hash; 1670 Elf_Internal_Sym *isymbuf, *isymend; 1671 Elf_Internal_Sym *isym; 1672 int symcount; 1673 int offset; 1674 bfd_vma src, dest; 1675 1676 /* We only do this once per section. We may be able to delete some code 1677 by running multiple passes, but it is not worth it. */ 1678 *again = FALSE; 1679 1680 /* Only do this for a text section. */ 1681 if (link_info->relocatable 1682 || (sec->flags & SEC_RELOC) == 0 1683 || (sec->reloc_count == 0) 1684 || (sec->flags & SEC_CODE) == 0) 1685 return TRUE; 1686 1687 BFD_ASSERT ((sec->size > 0) || (sec->rawsize > 0)); 1688 1689 /* If this is the first time we have been called for this section, 1690 initialize the cooked size. */ 1691 if (sec->size == 0) 1692 sec->size = sec->rawsize; 1693 1694 /* Get symbols for this section. */ 1695 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1696 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 1697 symcount = symtab_hdr->sh_size / sizeof (Elf32_External_Sym); 1698 if (isymbuf == NULL) 1699 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, symcount, 1700 0, NULL, NULL, NULL); 1701 BFD_ASSERT (isymbuf != NULL); 1702 1703 internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory); 1704 if (internal_relocs == NULL) 1705 goto error_return; 1706 if (! link_info->keep_memory) 1707 free_relocs = internal_relocs; 1708 1709 sec->relax = (struct relax_table *) bfd_malloc ((sec->reloc_count + 1) 1710 * sizeof (struct relax_table)); 1711 if (sec->relax == NULL) 1712 goto error_return; 1713 sec->relax_count = 0; 1714 1715 irelend = internal_relocs + sec->reloc_count; 1716 rel_count = 0; 1717 for (irel = internal_relocs; irel < irelend; irel++, rel_count++) 1718 { 1719 bfd_vma symval; 1720 if ((ELF32_R_TYPE (irel->r_info) != (int) R_MICROBLAZE_64_PCREL) 1721 && (ELF32_R_TYPE (irel->r_info) != (int) R_MICROBLAZE_64 )) 1722 continue; /* Can't delete this reloc. */ 1723 1724 /* Get the section contents. */ 1725 if (contents == NULL) 1726 { 1727 if (elf_section_data (sec)->this_hdr.contents != NULL) 1728 contents = elf_section_data (sec)->this_hdr.contents; 1729 else 1730 { 1731 contents = (bfd_byte *) bfd_malloc (sec->size); 1732 if (contents == NULL) 1733 goto error_return; 1734 free_contents = contents; 1735 1736 if (!bfd_get_section_contents (abfd, sec, contents, 1737 (file_ptr) 0, sec->size)) 1738 goto error_return; 1739 elf_section_data (sec)->this_hdr.contents = contents; 1740 } 1741 } 1742 1743 /* Get the value of the symbol referred to by the reloc. */ 1744 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 1745 { 1746 /* A local symbol. */ 1747 asection *sym_sec; 1748 1749 isym = isymbuf + ELF32_R_SYM (irel->r_info); 1750 if (isym->st_shndx == SHN_UNDEF) 1751 sym_sec = bfd_und_section_ptr; 1752 else if (isym->st_shndx == SHN_ABS) 1753 sym_sec = bfd_abs_section_ptr; 1754 else if (isym->st_shndx == SHN_COMMON) 1755 sym_sec = bfd_com_section_ptr; 1756 else 1757 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 1758 1759 symval = _bfd_elf_rela_local_sym (abfd, isym, &sym_sec, irel); 1760 } 1761 else 1762 { 1763 unsigned long indx; 1764 struct elf_link_hash_entry *h; 1765 1766 indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; 1767 h = elf_sym_hashes (abfd)[indx]; 1768 BFD_ASSERT (h != NULL); 1769 1770 if (h->root.type != bfd_link_hash_defined 1771 && h->root.type != bfd_link_hash_defweak) 1772 /* This appears to be a reference to an undefined 1773 symbol. Just ignore it--it will be caught by the 1774 regular reloc processing. */ 1775 continue; 1776 1777 symval = (h->root.u.def.value 1778 + h->root.u.def.section->output_section->vma 1779 + h->root.u.def.section->output_offset); 1780 } 1781 1782 /* If this is a PC-relative reloc, subtract the instr offset from 1783 the symbol value. */ 1784 if (ELF32_R_TYPE (irel->r_info) == (int) R_MICROBLAZE_64_PCREL) 1785 { 1786 symval = symval + irel->r_addend 1787 - (irel->r_offset 1788 + sec->output_section->vma 1789 + sec->output_offset); 1790 } 1791 else 1792 symval += irel->r_addend; 1793 1794 if ((symval & 0xffff8000) == 0 1795 || (symval & 0xffff8000) == 0xffff8000) 1796 { 1797 /* We can delete this instruction. */ 1798 sec->relax[sec->relax_count].addr = irel->r_offset; 1799 sec->relax[sec->relax_count].size = INST_WORD_SIZE; 1800 sec->relax_count++; 1801 1802 /* Rewrite relocation type. */ 1803 switch ((enum elf_microblaze_reloc_type) ELF32_R_TYPE (irel->r_info)) 1804 { 1805 case R_MICROBLAZE_64_PCREL: 1806 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1807 (int) R_MICROBLAZE_32_PCREL_LO); 1808 break; 1809 case R_MICROBLAZE_64: 1810 irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), 1811 (int) R_MICROBLAZE_32_LO); 1812 break; 1813 default: 1814 /* Cannot happen. */ 1815 BFD_ASSERT (FALSE); 1816 } 1817 } 1818 } /* Loop through all relocations. */ 1819 1820 /* Loop through the relocs again, and see if anything needs to change. */ 1821 if (sec->relax_count > 0) 1822 { 1823 shndx = _bfd_elf_section_from_bfd_section (abfd, sec); 1824 rel_count = 0; 1825 sec->relax[sec->relax_count].addr = sec->size; 1826 1827 for (irel = internal_relocs; irel < irelend; irel++, rel_count++) 1828 { 1829 bfd_vma nraddr; 1830 1831 /* Get the new reloc address. */ 1832 nraddr = irel->r_offset - calc_fixup (irel->r_offset, 0, sec); 1833 switch ((enum elf_microblaze_reloc_type) ELF32_R_TYPE (irel->r_info)) 1834 { 1835 default: 1836 break; 1837 case R_MICROBLAZE_64_PCREL: 1838 break; 1839 case R_MICROBLAZE_64: 1840 case R_MICROBLAZE_32_LO: 1841 /* If this reloc is against a symbol defined in this 1842 section, we must check the addend to see it will put the value in 1843 range to be adjusted, and hence must be changed. */ 1844 if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) 1845 { 1846 isym = isymbuf + ELF32_R_SYM (irel->r_info); 1847 /* Only handle relocs against .text. */ 1848 if (isym->st_shndx == shndx 1849 && ELF32_ST_TYPE (isym->st_info) == STT_SECTION) 1850 irel->r_addend -= calc_fixup (irel->r_addend, 0, sec); 1851 } 1852 break; 1853 case R_MICROBLAZE_NONE: 1854 { 1855 /* This was a PC-relative instruction that was 1856 completely resolved. */ 1857 int sfix, efix; 1858 bfd_vma target_address; 1859 target_address = irel->r_addend + irel->r_offset; 1860 sfix = calc_fixup (irel->r_offset, 0, sec); 1861 efix = calc_fixup (target_address, 0, sec); 1862 irel->r_addend -= (efix - sfix); 1863 /* Should use HOWTO. */ 1864 microblaze_bfd_write_imm_value_32 (abfd, contents + irel->r_offset, 1865 irel->r_addend); 1866 } 1867 break; 1868 case R_MICROBLAZE_64_NONE: 1869 { 1870 /* This was a PC-relative 64-bit instruction that was 1871 completely resolved. */ 1872 int sfix, efix; 1873 bfd_vma target_address; 1874 target_address = irel->r_addend + irel->r_offset + INST_WORD_SIZE; 1875 sfix = calc_fixup (irel->r_offset + INST_WORD_SIZE, 0, sec); 1876 efix = calc_fixup (target_address, 0, sec); 1877 irel->r_addend -= (efix - sfix); 1878 microblaze_bfd_write_imm_value_32 (abfd, contents + irel->r_offset 1879 + INST_WORD_SIZE, irel->r_addend); 1880 } 1881 break; 1882 } 1883 irel->r_offset = nraddr; 1884 } /* Change all relocs in this section. */ 1885 1886 /* Look through all other sections. */ 1887 for (o = abfd->sections; o != NULL; o = o->next) 1888 { 1889 Elf_Internal_Rela *irelocs; 1890 Elf_Internal_Rela *irelscan, *irelscanend; 1891 bfd_byte *ocontents; 1892 1893 if (o == sec 1894 || (o->flags & SEC_RELOC) == 0 1895 || o->reloc_count == 0) 1896 continue; 1897 1898 /* We always cache the relocs. Perhaps, if info->keep_memory is 1899 FALSE, we should free them, if we are permitted to. */ 1900 1901 irelocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL, TRUE); 1902 if (irelocs == NULL) 1903 goto error_return; 1904 1905 ocontents = NULL; 1906 irelscanend = irelocs + o->reloc_count; 1907 for (irelscan = irelocs; irelscan < irelscanend; irelscan++) 1908 { 1909 if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32) 1910 { 1911 isym = isymbuf + ELF32_R_SYM (irelscan->r_info); 1912 1913 /* Look at the reloc only if the value has been resolved. */ 1914 if (isym->st_shndx == shndx 1915 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION)) 1916 { 1917 if (ocontents == NULL) 1918 { 1919 if (elf_section_data (o)->this_hdr.contents != NULL) 1920 ocontents = elf_section_data (o)->this_hdr.contents; 1921 else 1922 { 1923 /* We always cache the section contents. 1924 Perhaps, if info->keep_memory is FALSE, we 1925 should free them, if we are permitted to. */ 1926 if (o->rawsize == 0) 1927 o->rawsize = o->size; 1928 ocontents = (bfd_byte *) bfd_malloc (o->rawsize); 1929 if (ocontents == NULL) 1930 goto error_return; 1931 if (!bfd_get_section_contents (abfd, o, ocontents, 1932 (file_ptr) 0, 1933 o->rawsize)) 1934 goto error_return; 1935 elf_section_data (o)->this_hdr.contents = ocontents; 1936 } 1937 1938 } 1939 irelscan->r_addend -= calc_fixup (irelscan->r_addend, 0, sec); 1940 } 1941 else if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_SYM_OP_SYM) 1942 { 1943 isym = isymbuf + ELF32_R_SYM (irelscan->r_info); 1944 1945 /* Look at the reloc only if the value has been resolved. */ 1946 if (ocontents == NULL) 1947 { 1948 if (elf_section_data (o)->this_hdr.contents != NULL) 1949 ocontents = elf_section_data (o)->this_hdr.contents; 1950 else 1951 { 1952 /* We always cache the section contents. 1953 Perhaps, if info->keep_memory is FALSE, we 1954 should free them, if we are permitted to. */ 1955 1956 if (o->rawsize == 0) 1957 o->rawsize = o->size; 1958 ocontents = (bfd_byte *) bfd_malloc (o->rawsize); 1959 if (ocontents == NULL) 1960 goto error_return; 1961 if (!bfd_get_section_contents (abfd, o, ocontents, 1962 (file_ptr) 0, 1963 o->rawsize)) 1964 goto error_return; 1965 elf_section_data (o)->this_hdr.contents = ocontents; 1966 } 1967 } 1968 irelscan->r_addend -= calc_fixup (irel->r_addend 1969 + isym->st_value, 1970 0, 1971 sec); 1972 } 1973 } 1974 else if ((ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_PCREL_LO) 1975 || (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_32_LO)) 1976 { 1977 isym = isymbuf + ELF32_R_SYM (irelscan->r_info); 1978 1979 /* Look at the reloc only if the value has been resolved. */ 1980 if (isym->st_shndx == shndx 1981 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION)) 1982 { 1983 bfd_vma immediate; 1984 bfd_vma target_address; 1985 1986 if (ocontents == NULL) 1987 { 1988 if (elf_section_data (o)->this_hdr.contents != NULL) 1989 ocontents = elf_section_data (o)->this_hdr.contents; 1990 else 1991 { 1992 /* We always cache the section contents. 1993 Perhaps, if info->keep_memory is FALSE, we 1994 should free them, if we are permitted to. */ 1995 if (o->rawsize == 0) 1996 o->rawsize = o->size; 1997 ocontents = (bfd_byte *) bfd_malloc (o->rawsize); 1998 if (ocontents == NULL) 1999 goto error_return; 2000 if (!bfd_get_section_contents (abfd, o, ocontents, 2001 (file_ptr) 0, 2002 o->rawsize)) 2003 goto error_return; 2004 elf_section_data (o)->this_hdr.contents = ocontents; 2005 } 2006 } 2007 2008 unsigned long instr = bfd_get_32 (abfd, ocontents + irelscan->r_offset); 2009 immediate = instr & 0x0000ffff; 2010 target_address = immediate; 2011 offset = calc_fixup (target_address, 0, sec); 2012 immediate -= offset; 2013 irelscan->r_addend -= offset; 2014 microblaze_bfd_write_imm_value_32 (abfd, ocontents + irelscan->r_offset, 2015 irelscan->r_addend); 2016 } 2017 } 2018 2019 if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_64) 2020 { 2021 isym = isymbuf + ELF32_R_SYM (irelscan->r_info); 2022 2023 /* Look at the reloc only if the value has been resolved. */ 2024 if (isym->st_shndx == shndx 2025 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION)) 2026 { 2027 bfd_vma immediate; 2028 2029 if (ocontents == NULL) 2030 { 2031 if (elf_section_data (o)->this_hdr.contents != NULL) 2032 ocontents = elf_section_data (o)->this_hdr.contents; 2033 else 2034 { 2035 /* We always cache the section contents. 2036 Perhaps, if info->keep_memory is FALSE, we 2037 should free them, if we are permitted to. */ 2038 2039 if (o->rawsize == 0) 2040 o->rawsize = o->size; 2041 ocontents = (bfd_byte *) bfd_malloc (o->rawsize); 2042 if (ocontents == NULL) 2043 goto error_return; 2044 if (!bfd_get_section_contents (abfd, o, ocontents, 2045 (file_ptr) 0, 2046 o->rawsize)) 2047 goto error_return; 2048 elf_section_data (o)->this_hdr.contents = ocontents; 2049 } 2050 } 2051 unsigned long instr_hi = bfd_get_32 (abfd, ocontents 2052 + irelscan->r_offset); 2053 unsigned long instr_lo = bfd_get_32 (abfd, ocontents 2054 + irelscan->r_offset 2055 + INST_WORD_SIZE); 2056 immediate = (instr_hi & 0x0000ffff) << 16; 2057 immediate |= (instr_lo & 0x0000ffff); 2058 offset = calc_fixup (irelscan->r_addend, 0, sec); 2059 immediate -= offset; 2060 irelscan->r_addend -= offset; 2061 } 2062 } 2063 else if (ELF32_R_TYPE (irelscan->r_info) == (int) R_MICROBLAZE_64_PCREL) 2064 { 2065 isym = isymbuf + ELF32_R_SYM (irelscan->r_info); 2066 2067 /* Look at the reloc only if the value has been resolved. */ 2068 if (isym->st_shndx == shndx 2069 && (ELF32_ST_TYPE (isym->st_info) == STT_SECTION)) 2070 { 2071 bfd_vma immediate; 2072 bfd_vma target_address; 2073 2074 if (ocontents == NULL) 2075 { 2076 if (elf_section_data (o)->this_hdr.contents != NULL) 2077 ocontents = elf_section_data (o)->this_hdr.contents; 2078 else 2079 { 2080 /* We always cache the section contents. 2081 Perhaps, if info->keep_memory is FALSE, we 2082 should free them, if we are permitted to. */ 2083 if (o->rawsize == 0) 2084 o->rawsize = o->size; 2085 ocontents = (bfd_byte *) bfd_malloc (o->rawsize); 2086 if (ocontents == NULL) 2087 goto error_return; 2088 if (!bfd_get_section_contents (abfd, o, ocontents, 2089 (file_ptr) 0, 2090 o->rawsize)) 2091 goto error_return; 2092 elf_section_data (o)->this_hdr.contents = ocontents; 2093 } 2094 } 2095 unsigned long instr_hi = bfd_get_32 (abfd, ocontents 2096 + irelscan->r_offset); 2097 unsigned long instr_lo = bfd_get_32 (abfd, ocontents 2098 + irelscan->r_offset 2099 + INST_WORD_SIZE); 2100 immediate = (instr_hi & 0x0000ffff) << 16; 2101 immediate |= (instr_lo & 0x0000ffff); 2102 target_address = immediate; 2103 offset = calc_fixup (target_address, 0, sec); 2104 immediate -= offset; 2105 irelscan->r_addend -= offset; 2106 microblaze_bfd_write_imm_value_64 (abfd, ocontents 2107 + irelscan->r_offset, immediate); 2108 } 2109 } 2110 } 2111 } 2112 2113 /* Adjust the local symbols defined in this section. */ 2114 isymend = isymbuf + symtab_hdr->sh_info; 2115 for (isym = isymbuf; isym < isymend; isym++) 2116 { 2117 if (isym->st_shndx == shndx) 2118 { 2119 isym->st_value -= calc_fixup (isym->st_value, 0, sec); 2120 if (isym->st_size) 2121 isym->st_size -= calc_fixup (isym->st_value, isym->st_size, sec); 2122 } 2123 } 2124 2125 /* Now adjust the global symbols defined in this section. */ 2126 isym = isymbuf + symtab_hdr->sh_info; 2127 symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)) - symtab_hdr->sh_info; 2128 for (sym_index = 0; sym_index < symcount; sym_index++) 2129 { 2130 sym_hash = elf_sym_hashes (abfd)[sym_index]; 2131 if ((sym_hash->root.type == bfd_link_hash_defined 2132 || sym_hash->root.type == bfd_link_hash_defweak) 2133 && sym_hash->root.u.def.section == sec) 2134 { 2135 sym_hash->root.u.def.value -= calc_fixup (sym_hash->root.u.def.value, 2136 0, sec); 2137 if (sym_hash->size) 2138 sym_hash->size -= calc_fixup (sym_hash->root.u.def.value, 2139 sym_hash->size, sec); 2140 } 2141 } 2142 2143 /* Physically move the code and change the cooked size. */ 2144 dest = sec->relax[0].addr; 2145 for (i = 0; i < sec->relax_count; i++) 2146 { 2147 int len; 2148 src = sec->relax[i].addr + sec->relax[i].size; 2149 len = sec->relax[i+1].addr - sec->relax[i].addr - sec->relax[i].size; 2150 2151 memmove (contents + dest, contents + src, len); 2152 sec->size -= sec->relax[i].size; 2153 dest += len; 2154 } 2155 2156 elf_section_data (sec)->relocs = internal_relocs; 2157 free_relocs = NULL; 2158 2159 elf_section_data (sec)->this_hdr.contents = contents; 2160 free_contents = NULL; 2161 2162 symtab_hdr->contents = (bfd_byte *) isymbuf; 2163 } 2164 2165 if (free_relocs != NULL) 2166 { 2167 free (free_relocs); 2168 free_relocs = NULL; 2169 } 2170 2171 if (free_contents != NULL) 2172 { 2173 if (!link_info->keep_memory) 2174 free (free_contents); 2175 else 2176 /* Cache the section contents for elf_link_input_bfd. */ 2177 elf_section_data (sec)->this_hdr.contents = contents; 2178 free_contents = NULL; 2179 } 2180 2181 if (sec->relax_count == 0) 2182 { 2183 *again = FALSE; 2184 free (sec->relax); 2185 sec->relax = NULL; 2186 } 2187 else 2188 *again = TRUE; 2189 return TRUE; 2190 2191 error_return: 2192 if (free_relocs != NULL) 2193 free (free_relocs); 2194 if (free_contents != NULL) 2195 free (free_contents); 2196 if (sec->relax != NULL) 2197 { 2198 free (sec->relax); 2199 sec->relax = NULL; 2200 sec->relax_count = 0; 2201 } 2202 return FALSE; 2203 } 2204 2205 /* Return the section that should be marked against GC for a given 2206 relocation. */ 2207 2208 static asection * 2209 microblaze_elf_gc_mark_hook (asection *sec, 2210 struct bfd_link_info * info, 2211 Elf_Internal_Rela * rel, 2212 struct elf_link_hash_entry * h, 2213 Elf_Internal_Sym * sym) 2214 { 2215 if (h != NULL) 2216 switch (ELF32_R_TYPE (rel->r_info)) 2217 { 2218 case R_MICROBLAZE_GNU_VTINHERIT: 2219 case R_MICROBLAZE_GNU_VTENTRY: 2220 return NULL; 2221 } 2222 2223 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2224 } 2225 2226 /* Update the got entry reference counts for the section being removed. */ 2227 2228 static bfd_boolean 2229 microblaze_elf_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED, 2230 struct bfd_link_info * info ATTRIBUTE_UNUSED, 2231 asection * sec ATTRIBUTE_UNUSED, 2232 const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED) 2233 { 2234 return TRUE; 2235 } 2236 2237 /* PIC support. */ 2238 2239 #define PLT_ENTRY_SIZE 16 2240 2241 #define PLT_ENTRY_WORD_0 0xb0000000 /* "imm 0". */ 2242 #define PLT_ENTRY_WORD_1 0xe9940000 /* "lwi r12,r20,0" - relocated to lwi r12,r20,func@GOT. */ 2243 #define PLT_ENTRY_WORD_1_NOPIC 0xe9800000 /* "lwi r12,r0,0" - non-PIC object. */ 2244 #define PLT_ENTRY_WORD_2 0x98186000 /* "brad r12". */ 2245 #define PLT_ENTRY_WORD_3 0x80000000 /* "nop". */ 2246 2247 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up 2248 shortcuts to them in our hash table. */ 2249 2250 static bfd_boolean 2251 create_got_section (bfd *dynobj, struct bfd_link_info *info) 2252 { 2253 struct elf32_mb_link_hash_table *htab; 2254 2255 if (! _bfd_elf_create_got_section (dynobj, info)) 2256 return FALSE; 2257 htab = elf32_mb_hash_table (info); 2258 if (htab == NULL) 2259 return FALSE; 2260 2261 htab->sgot = bfd_get_linker_section (dynobj, ".got"); 2262 htab->sgotplt = bfd_get_linker_section (dynobj, ".got.plt"); 2263 if (!htab->sgot || !htab->sgotplt) 2264 return FALSE; 2265 2266 if ((htab->srelgot = bfd_get_linker_section (dynobj, ".rela.got")) == NULL) 2267 htab->srelgot = bfd_make_section_anyway (dynobj, ".rela.got"); 2268 if (htab->srelgot == NULL 2269 || ! bfd_set_section_flags (dynobj, htab->srelgot, SEC_ALLOC 2270 | SEC_LOAD 2271 | SEC_HAS_CONTENTS 2272 | SEC_IN_MEMORY 2273 | SEC_LINKER_CREATED 2274 | SEC_READONLY) 2275 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) 2276 return FALSE; 2277 return TRUE; 2278 } 2279 2280 static bfd_boolean 2281 update_local_sym_info (bfd *abfd, 2282 Elf_Internal_Shdr *symtab_hdr, 2283 unsigned long r_symndx, 2284 unsigned int tls_type) 2285 { 2286 bfd_signed_vma *local_got_refcounts = elf_local_got_refcounts (abfd); 2287 unsigned char *local_got_tls_masks; 2288 2289 if (local_got_refcounts == NULL) 2290 { 2291 bfd_size_type size = symtab_hdr->sh_info; 2292 2293 size *= (sizeof (*local_got_refcounts) + sizeof (*local_got_tls_masks)); 2294 local_got_refcounts = bfd_zalloc (abfd, size); 2295 if (local_got_refcounts == NULL) 2296 return FALSE; 2297 elf_local_got_refcounts (abfd) = local_got_refcounts; 2298 } 2299 2300 local_got_tls_masks = 2301 (unsigned char *) (local_got_refcounts + symtab_hdr->sh_info); 2302 local_got_tls_masks[r_symndx] |= tls_type; 2303 local_got_refcounts[r_symndx] += 1; 2304 2305 return TRUE; 2306 } 2307 /* Look through the relocs for a section during the first phase. */ 2308 2309 static bfd_boolean 2310 microblaze_elf_check_relocs (bfd * abfd, 2311 struct bfd_link_info * info, 2312 asection * sec, 2313 const Elf_Internal_Rela * relocs) 2314 { 2315 Elf_Internal_Shdr * symtab_hdr; 2316 struct elf_link_hash_entry ** sym_hashes; 2317 struct elf_link_hash_entry ** sym_hashes_end; 2318 const Elf_Internal_Rela * rel; 2319 const Elf_Internal_Rela * rel_end; 2320 struct elf32_mb_link_hash_table *htab; 2321 asection *sreloc = NULL; 2322 2323 if (info->relocatable) 2324 return TRUE; 2325 2326 htab = elf32_mb_hash_table (info); 2327 if (htab == NULL) 2328 return FALSE; 2329 2330 symtab_hdr = & elf_tdata (abfd)->symtab_hdr; 2331 sym_hashes = elf_sym_hashes (abfd); 2332 sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); 2333 if (!elf_bad_symtab (abfd)) 2334 sym_hashes_end -= symtab_hdr->sh_info; 2335 2336 rel_end = relocs + sec->reloc_count; 2337 2338 for (rel = relocs; rel < rel_end; rel++) 2339 { 2340 unsigned int r_type; 2341 struct elf_link_hash_entry * h; 2342 unsigned long r_symndx; 2343 unsigned char tls_type = 0; 2344 2345 r_symndx = ELF32_R_SYM (rel->r_info); 2346 r_type = ELF32_R_TYPE (rel->r_info); 2347 2348 if (r_symndx < symtab_hdr->sh_info) 2349 h = NULL; 2350 else 2351 h = sym_hashes [r_symndx - symtab_hdr->sh_info]; 2352 2353 switch (r_type) 2354 { 2355 /* This relocation describes the C++ object vtable hierarchy. 2356 Reconstruct it for later use during GC. */ 2357 case R_MICROBLAZE_GNU_VTINHERIT: 2358 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2359 return FALSE; 2360 break; 2361 2362 /* This relocation describes which C++ vtable entries are actually 2363 used. Record for later use during GC. */ 2364 case R_MICROBLAZE_GNU_VTENTRY: 2365 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2366 return FALSE; 2367 break; 2368 2369 /* This relocation requires .plt entry. */ 2370 case R_MICROBLAZE_PLT_64: 2371 if (h != NULL) 2372 { 2373 h->needs_plt = 1; 2374 h->plt.refcount += 1; 2375 } 2376 break; 2377 2378 /* This relocation requires .got entry. */ 2379 case R_MICROBLAZE_TLSGD: 2380 tls_type |= (TLS_TLS | TLS_GD); 2381 goto dogottls; 2382 case R_MICROBLAZE_TLSLD: 2383 tls_type |= (TLS_TLS | TLS_LD); 2384 dogottls: 2385 sec->has_tls_reloc = 1; 2386 case R_MICROBLAZE_GOT_64: 2387 if (htab->sgot == NULL) 2388 { 2389 if (htab->elf.dynobj == NULL) 2390 htab->elf.dynobj = abfd; 2391 if (!create_got_section (htab->elf.dynobj, info)) 2392 return FALSE; 2393 } 2394 if (h != NULL) 2395 { 2396 h->got.refcount += 1; 2397 elf32_mb_hash_entry (h)->tls_mask |= tls_type; 2398 } 2399 else 2400 { 2401 if (! update_local_sym_info(abfd, symtab_hdr, r_symndx, tls_type) ) 2402 return FALSE; 2403 } 2404 break; 2405 2406 case R_MICROBLAZE_64: 2407 case R_MICROBLAZE_64_PCREL: 2408 case R_MICROBLAZE_32: 2409 { 2410 if (h != NULL && !info->shared) 2411 { 2412 /* we may need a copy reloc. */ 2413 h->non_got_ref = 1; 2414 2415 /* we may also need a .plt entry. */ 2416 h->plt.refcount += 1; 2417 if (ELF32_R_TYPE (rel->r_info) != R_MICROBLAZE_64_PCREL) 2418 h->pointer_equality_needed = 1; 2419 } 2420 2421 2422 /* If we are creating a shared library, and this is a reloc 2423 against a global symbol, or a non PC relative reloc 2424 against a local symbol, then we need to copy the reloc 2425 into the shared library. However, if we are linking with 2426 -Bsymbolic, we do not need to copy a reloc against a 2427 global symbol which is defined in an object we are 2428 including in the link (i.e., DEF_REGULAR is set). At 2429 this point we have not seen all the input files, so it is 2430 possible that DEF_REGULAR is not set now but will be set 2431 later (it is never cleared). In case of a weak definition, 2432 DEF_REGULAR may be cleared later by a strong definition in 2433 a shared library. We account for that possibility below by 2434 storing information in the relocs_copied field of the hash 2435 table entry. A similar situation occurs when creating 2436 shared libraries and symbol visibility changes render the 2437 symbol local. 2438 2439 If on the other hand, we are creating an executable, we 2440 may need to keep relocations for symbols satisfied by a 2441 dynamic library if we manage to avoid copy relocs for the 2442 symbol. */ 2443 2444 if ((info->shared 2445 && (sec->flags & SEC_ALLOC) != 0 2446 && (r_type != R_MICROBLAZE_64_PCREL 2447 || (h != NULL 2448 && (! info->symbolic 2449 || h->root.type == bfd_link_hash_defweak 2450 || !h->def_regular)))) 2451 || (!info->shared 2452 && (sec->flags & SEC_ALLOC) != 0 2453 && h != NULL 2454 && (h->root.type == bfd_link_hash_defweak 2455 || !h->def_regular))) 2456 { 2457 struct elf32_mb_dyn_relocs *p; 2458 struct elf32_mb_dyn_relocs **head; 2459 2460 /* When creating a shared object, we must copy these 2461 relocs into the output file. We create a reloc 2462 section in dynobj and make room for the reloc. */ 2463 2464 if (sreloc == NULL) 2465 { 2466 bfd *dynobj; 2467 2468 if (htab->elf.dynobj == NULL) 2469 htab->elf.dynobj = abfd; 2470 dynobj = htab->elf.dynobj; 2471 2472 sreloc = _bfd_elf_make_dynamic_reloc_section (sec, dynobj, 2473 2, abfd, 1); 2474 if (sreloc == NULL) 2475 return FALSE; 2476 } 2477 2478 /* If this is a global symbol, we count the number of 2479 relocations we need for this symbol. */ 2480 if (h != NULL) 2481 head = &((struct elf32_mb_link_hash_entry *) h)->dyn_relocs; 2482 else 2483 { 2484 /* Track dynamic relocs needed for local syms too. 2485 We really need local syms available to do this 2486 easily. Oh well. */ 2487 2488 asection *s; 2489 Elf_Internal_Sym *isym; 2490 void *vpp; 2491 2492 isym = bfd_sym_from_r_symndx (&htab->sym_sec, 2493 abfd, r_symndx); 2494 if (isym == NULL) 2495 return FALSE; 2496 2497 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 2498 if (s == NULL) 2499 return FALSE; 2500 2501 vpp = &elf_section_data (s)->local_dynrel; 2502 head = (struct elf32_mb_dyn_relocs **) vpp; 2503 } 2504 2505 p = *head; 2506 if (p == NULL || p->sec != sec) 2507 { 2508 bfd_size_type amt = sizeof *p; 2509 p = ((struct elf32_mb_dyn_relocs *) 2510 bfd_alloc (htab->elf.dynobj, amt)); 2511 if (p == NULL) 2512 return FALSE; 2513 p->next = *head; 2514 *head = p; 2515 p->sec = sec; 2516 p->count = 0; 2517 p->pc_count = 0; 2518 } 2519 2520 p->count += 1; 2521 if (r_type == R_MICROBLAZE_64_PCREL) 2522 p->pc_count += 1; 2523 } 2524 } 2525 break; 2526 } 2527 } 2528 2529 return TRUE; 2530 } 2531 2532 static bfd_boolean 2533 microblaze_elf_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 2534 { 2535 struct elf32_mb_link_hash_table *htab; 2536 2537 htab = elf32_mb_hash_table (info); 2538 if (htab == NULL) 2539 return FALSE; 2540 2541 if (!htab->sgot && !create_got_section (dynobj, info)) 2542 return FALSE; 2543 2544 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 2545 return FALSE; 2546 2547 htab->splt = bfd_get_linker_section (dynobj, ".plt"); 2548 htab->srelplt = bfd_get_linker_section (dynobj, ".rela.plt"); 2549 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss"); 2550 if (!info->shared) 2551 htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss"); 2552 2553 if (!htab->splt || !htab->srelplt || !htab->sdynbss 2554 || (!info->shared && !htab->srelbss)) 2555 abort (); 2556 2557 return TRUE; 2558 } 2559 2560 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 2561 2562 static void 2563 microblaze_elf_copy_indirect_symbol (struct bfd_link_info *info, 2564 struct elf_link_hash_entry *dir, 2565 struct elf_link_hash_entry *ind) 2566 { 2567 struct elf32_mb_link_hash_entry *edir, *eind; 2568 2569 edir = (struct elf32_mb_link_hash_entry *) dir; 2570 eind = (struct elf32_mb_link_hash_entry *) ind; 2571 2572 if (eind->dyn_relocs != NULL) 2573 { 2574 if (edir->dyn_relocs != NULL) 2575 { 2576 struct elf32_mb_dyn_relocs **pp; 2577 struct elf32_mb_dyn_relocs *p; 2578 2579 if (ind->root.type == bfd_link_hash_indirect) 2580 abort (); 2581 2582 /* Add reloc counts against the weak sym to the strong sym 2583 list. Merge any entries against the same section. */ 2584 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 2585 { 2586 struct elf32_mb_dyn_relocs *q; 2587 2588 for (q = edir->dyn_relocs; q != NULL; q = q->next) 2589 if (q->sec == p->sec) 2590 { 2591 q->pc_count += p->pc_count; 2592 q->count += p->count; 2593 *pp = p->next; 2594 break; 2595 } 2596 if (q == NULL) 2597 pp = &p->next; 2598 } 2599 *pp = edir->dyn_relocs; 2600 } 2601 2602 edir->dyn_relocs = eind->dyn_relocs; 2603 eind->dyn_relocs = NULL; 2604 } 2605 2606 edir->tls_mask |= eind->tls_mask; 2607 2608 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 2609 } 2610 2611 static bfd_boolean 2612 microblaze_elf_adjust_dynamic_symbol (struct bfd_link_info *info, 2613 struct elf_link_hash_entry *h) 2614 { 2615 struct elf32_mb_link_hash_table *htab; 2616 struct elf32_mb_link_hash_entry * eh; 2617 struct elf32_mb_dyn_relocs *p; 2618 asection *sdynbss, *s; 2619 unsigned int power_of_two; 2620 bfd *dynobj; 2621 2622 htab = elf32_mb_hash_table (info); 2623 if (htab == NULL) 2624 return FALSE; 2625 2626 /* If this is a function, put it in the procedure linkage table. We 2627 will fill in the contents of the procedure linkage table later, 2628 when we know the address of the .got section. */ 2629 if (h->type == STT_FUNC 2630 || h->needs_plt) 2631 { 2632 if (h->plt.refcount <= 0 2633 || SYMBOL_CALLS_LOCAL (info, h) 2634 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 2635 && h->root.type == bfd_link_hash_undefweak)) 2636 { 2637 /* This case can occur if we saw a PLT reloc in an input 2638 file, but the symbol was never referred to by a dynamic 2639 object, or if all references were garbage collected. In 2640 such a case, we don't actually need to build a procedure 2641 linkage table, and we can just do a PC32 reloc instead. */ 2642 h->plt.offset = (bfd_vma) -1; 2643 h->needs_plt = 0; 2644 } 2645 2646 return TRUE; 2647 } 2648 else 2649 /* It's possible that we incorrectly decided a .plt reloc was 2650 needed for an R_MICROBLAZE_64_PCREL reloc to a non-function sym in 2651 check_relocs. We can't decide accurately between function and 2652 non-function syms in check-relocs; Objects loaded later in 2653 the link may change h->type. So fix it now. */ 2654 h->plt.offset = (bfd_vma) -1; 2655 2656 /* If this is a weak symbol, and there is a real definition, the 2657 processor independent code will have arranged for us to see the 2658 real definition first, and we can just use the same value. */ 2659 if (h->u.weakdef != NULL) 2660 { 2661 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 2662 || h->u.weakdef->root.type == bfd_link_hash_defweak); 2663 h->root.u.def.section = h->u.weakdef->root.u.def.section; 2664 h->root.u.def.value = h->u.weakdef->root.u.def.value; 2665 return TRUE; 2666 } 2667 2668 /* This is a reference to a symbol defined by a dynamic object which 2669 is not a function. */ 2670 2671 /* If we are creating a shared library, we must presume that the 2672 only references to the symbol are via the global offset table. 2673 For such cases we need not do anything here; the relocations will 2674 be handled correctly by relocate_section. */ 2675 if (info->shared) 2676 return TRUE; 2677 2678 /* If there are no references to this symbol that do not use the 2679 GOT, we don't need to generate a copy reloc. */ 2680 if (!h->non_got_ref) 2681 return TRUE; 2682 2683 /* If -z nocopyreloc was given, we won't generate them either. */ 2684 if (info->nocopyreloc) 2685 { 2686 h->non_got_ref = 0; 2687 return TRUE; 2688 } 2689 2690 eh = (struct elf32_mb_link_hash_entry *) h; 2691 for (p = eh->dyn_relocs; p != NULL; p = p->next) 2692 { 2693 s = p->sec->output_section; 2694 if (s != NULL && (s->flags & SEC_READONLY) != 0) 2695 break; 2696 } 2697 2698 /* If we didn't find any dynamic relocs in read-only sections, then 2699 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 2700 if (p == NULL) 2701 { 2702 h->non_got_ref = 0; 2703 return TRUE; 2704 } 2705 2706 /* We must allocate the symbol in our .dynbss section, which will 2707 become part of the .bss section of the executable. There will be 2708 an entry for this symbol in the .dynsym section. The dynamic 2709 object will contain position independent code, so all references 2710 from the dynamic object to this symbol will go through the global 2711 offset table. The dynamic linker will use the .dynsym entry to 2712 determine the address it must put in the global offset table, so 2713 both the dynamic object and the regular object will refer to the 2714 same memory location for the variable. */ 2715 2716 /* We must generate a R_MICROBLAZE_COPY reloc to tell the dynamic linker 2717 to copy the initial value out of the dynamic object and into the 2718 runtime process image. */ 2719 dynobj = elf_hash_table (info)->dynobj; 2720 BFD_ASSERT (dynobj != NULL); 2721 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 2722 { 2723 htab->srelbss->size += sizeof (Elf32_External_Rela); 2724 h->needs_copy = 1; 2725 } 2726 2727 /* We need to figure out the alignment required for this symbol. I 2728 have no idea how ELF linkers handle this. */ 2729 power_of_two = bfd_log2 (h->size); 2730 if (power_of_two > 3) 2731 power_of_two = 3; 2732 2733 sdynbss = htab->sdynbss; 2734 /* Apply the required alignment. */ 2735 sdynbss->size = BFD_ALIGN (sdynbss->size, (bfd_size_type) (1 << power_of_two)); 2736 if (power_of_two > bfd_get_section_alignment (dynobj, sdynbss)) 2737 { 2738 if (! bfd_set_section_alignment (dynobj, sdynbss, power_of_two)) 2739 return FALSE; 2740 } 2741 2742 /* Define the symbol as being at this point in the section. */ 2743 h->root.u.def.section = sdynbss; 2744 h->root.u.def.value = sdynbss->size; 2745 2746 /* Increment the section size to make room for the symbol. */ 2747 sdynbss->size += h->size; 2748 return TRUE; 2749 } 2750 2751 /* Allocate space in .plt, .got and associated reloc sections for 2752 dynamic relocs. */ 2753 2754 static bfd_boolean 2755 allocate_dynrelocs (struct elf_link_hash_entry *h, void * dat) 2756 { 2757 struct bfd_link_info *info; 2758 struct elf32_mb_link_hash_table *htab; 2759 struct elf32_mb_link_hash_entry *eh; 2760 struct elf32_mb_dyn_relocs *p; 2761 2762 if (h->root.type == bfd_link_hash_indirect) 2763 return TRUE; 2764 2765 info = (struct bfd_link_info *) dat; 2766 htab = elf32_mb_hash_table (info); 2767 if (htab == NULL) 2768 return FALSE; 2769 2770 if (htab->elf.dynamic_sections_created 2771 && h->plt.refcount > 0) 2772 { 2773 /* Make sure this symbol is output as a dynamic symbol. 2774 Undefined weak syms won't yet be marked as dynamic. */ 2775 if (h->dynindx == -1 2776 && !h->forced_local) 2777 { 2778 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2779 return FALSE; 2780 } 2781 2782 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info->shared, h)) 2783 { 2784 asection *s = htab->splt; 2785 2786 /* The first entry in .plt is reserved. */ 2787 if (s->size == 0) 2788 s->size = PLT_ENTRY_SIZE; 2789 2790 h->plt.offset = s->size; 2791 2792 /* If this symbol is not defined in a regular file, and we are 2793 not generating a shared library, then set the symbol to this 2794 location in the .plt. This is required to make function 2795 pointers compare as equal between the normal executable and 2796 the shared library. */ 2797 if (! info->shared 2798 && !h->def_regular) 2799 { 2800 h->root.u.def.section = s; 2801 h->root.u.def.value = h->plt.offset; 2802 } 2803 2804 /* Make room for this entry. */ 2805 s->size += PLT_ENTRY_SIZE; 2806 2807 /* We also need to make an entry in the .got.plt section, which 2808 will be placed in the .got section by the linker script. */ 2809 htab->sgotplt->size += 4; 2810 2811 /* We also need to make an entry in the .rel.plt section. */ 2812 htab->srelplt->size += sizeof (Elf32_External_Rela); 2813 } 2814 else 2815 { 2816 h->plt.offset = (bfd_vma) -1; 2817 h->needs_plt = 0; 2818 } 2819 } 2820 else 2821 { 2822 h->plt.offset = (bfd_vma) -1; 2823 h->needs_plt = 0; 2824 } 2825 2826 eh = (struct elf32_mb_link_hash_entry *) h; 2827 if (h->got.refcount > 0) 2828 { 2829 unsigned int need; 2830 asection *s; 2831 2832 /* Make sure this symbol is output as a dynamic symbol. 2833 Undefined weak syms won't yet be marked as dynamic. */ 2834 if (h->dynindx == -1 2835 && !h->forced_local) 2836 { 2837 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2838 return FALSE; 2839 } 2840 2841 need = 0; 2842 if ((eh->tls_mask & TLS_TLS) != 0) 2843 { 2844 /* Handle TLS Symbol */ 2845 if ((eh->tls_mask & TLS_LD) != 0) 2846 { 2847 if (!eh->elf.def_dynamic) 2848 /* We'll just use htab->tlsld_got.offset. This should 2849 always be the case. It's a little odd if we have 2850 a local dynamic reloc against a non-local symbol. */ 2851 htab->tlsld_got.refcount += 1; 2852 else 2853 need += 8; 2854 } 2855 if ((eh->tls_mask & TLS_GD) != 0) 2856 need += 8; 2857 } 2858 else 2859 { 2860 /* Regular (non-TLS) symbol */ 2861 need += 4; 2862 } 2863 if (need == 0) 2864 { 2865 h->got.offset = (bfd_vma) -1; 2866 } 2867 else 2868 { 2869 s = htab->sgot; 2870 h->got.offset = s->size; 2871 s->size += need; 2872 htab->srelgot->size += need * (sizeof (Elf32_External_Rela) / 4); 2873 } 2874 } 2875 else 2876 h->got.offset = (bfd_vma) -1; 2877 2878 if (eh->dyn_relocs == NULL) 2879 return TRUE; 2880 2881 /* In the shared -Bsymbolic case, discard space allocated for 2882 dynamic pc-relative relocs against symbols which turn out to be 2883 defined in regular objects. For the normal shared case, discard 2884 space for pc-relative relocs that have become local due to symbol 2885 visibility changes. */ 2886 2887 if (info->shared) 2888 { 2889 if (h->def_regular 2890 && (h->forced_local 2891 || info->symbolic)) 2892 { 2893 struct elf32_mb_dyn_relocs **pp; 2894 2895 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 2896 { 2897 p->count -= p->pc_count; 2898 p->pc_count = 0; 2899 if (p->count == 0) 2900 *pp = p->next; 2901 else 2902 pp = &p->next; 2903 } 2904 } 2905 } 2906 else 2907 { 2908 /* For the non-shared case, discard space for relocs against 2909 symbols which turn out to need copy relocs or are not 2910 dynamic. */ 2911 2912 if (!h->non_got_ref 2913 && ((h->def_dynamic 2914 && !h->def_regular) 2915 || (htab->elf.dynamic_sections_created 2916 && (h->root.type == bfd_link_hash_undefweak 2917 || h->root.type == bfd_link_hash_undefined)))) 2918 { 2919 /* Make sure this symbol is output as a dynamic symbol. 2920 Undefined weak syms won't yet be marked as dynamic. */ 2921 if (h->dynindx == -1 2922 && !h->forced_local) 2923 { 2924 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2925 return FALSE; 2926 } 2927 2928 /* If that succeeded, we know we'll be keeping all the 2929 relocs. */ 2930 if (h->dynindx != -1) 2931 goto keep; 2932 } 2933 2934 eh->dyn_relocs = NULL; 2935 2936 keep: ; 2937 } 2938 2939 /* Finally, allocate space. */ 2940 for (p = eh->dyn_relocs; p != NULL; p = p->next) 2941 { 2942 asection *sreloc = elf_section_data (p->sec)->sreloc; 2943 sreloc->size += p->count * sizeof (Elf32_External_Rela); 2944 } 2945 2946 return TRUE; 2947 } 2948 2949 /* Set the sizes of the dynamic sections. */ 2950 2951 static bfd_boolean 2952 microblaze_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 2953 struct bfd_link_info *info) 2954 { 2955 struct elf32_mb_link_hash_table *htab; 2956 bfd *dynobj; 2957 asection *s; 2958 bfd *ibfd; 2959 2960 htab = elf32_mb_hash_table (info); 2961 if (htab == NULL) 2962 return FALSE; 2963 2964 dynobj = htab->elf.dynobj; 2965 BFD_ASSERT (dynobj != NULL); 2966 2967 /* Set up .got offsets for local syms, and space for local dynamic 2968 relocs. */ 2969 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 2970 { 2971 bfd_signed_vma *local_got; 2972 bfd_signed_vma *end_local_got; 2973 bfd_size_type locsymcount; 2974 Elf_Internal_Shdr *symtab_hdr; 2975 unsigned char *lgot_masks; 2976 asection *srel; 2977 2978 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 2979 continue; 2980 2981 for (s = ibfd->sections; s != NULL; s = s->next) 2982 { 2983 struct elf32_mb_dyn_relocs *p; 2984 2985 for (p = ((struct elf32_mb_dyn_relocs *) 2986 elf_section_data (s)->local_dynrel); 2987 p != NULL; 2988 p = p->next) 2989 { 2990 if (!bfd_is_abs_section (p->sec) 2991 && bfd_is_abs_section (p->sec->output_section)) 2992 { 2993 /* Input section has been discarded, either because 2994 it is a copy of a linkonce section or due to 2995 linker script /DISCARD/, so we'll be discarding 2996 the relocs too. */ 2997 } 2998 else if (p->count != 0) 2999 { 3000 srel = elf_section_data (p->sec)->sreloc; 3001 srel->size += p->count * sizeof (Elf32_External_Rela); 3002 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 3003 info->flags |= DF_TEXTREL; 3004 } 3005 } 3006 } 3007 3008 local_got = elf_local_got_refcounts (ibfd); 3009 if (!local_got) 3010 continue; 3011 3012 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 3013 locsymcount = symtab_hdr->sh_info; 3014 end_local_got = local_got + locsymcount; 3015 lgot_masks = (unsigned char *) end_local_got; 3016 s = htab->sgot; 3017 srel = htab->srelgot; 3018 3019 for (; local_got < end_local_got; ++local_got, ++lgot_masks) 3020 { 3021 if (*local_got > 0) 3022 { 3023 unsigned int need = 0; 3024 if ((*lgot_masks & TLS_TLS) != 0) 3025 { 3026 if ((*lgot_masks & TLS_GD) != 0) 3027 need += 8; 3028 if ((*lgot_masks & TLS_LD) != 0) 3029 htab->tlsld_got.refcount += 1; 3030 } 3031 else 3032 need += 4; 3033 3034 if (need == 0) 3035 { 3036 *local_got = (bfd_vma) -1; 3037 } 3038 else 3039 { 3040 *local_got = s->size; 3041 s->size += need; 3042 if (info->shared) 3043 srel->size += need * (sizeof (Elf32_External_Rela) / 4); 3044 } 3045 } 3046 else 3047 *local_got = (bfd_vma) -1; 3048 } 3049 } 3050 3051 /* Allocate global sym .plt and .got entries, and space for global 3052 sym dynamic relocs. */ 3053 elf_link_hash_traverse (elf_hash_table (info), allocate_dynrelocs, info); 3054 3055 if (htab->tlsld_got.refcount > 0) 3056 { 3057 htab->tlsld_got.offset = htab->sgot->size; 3058 htab->sgot->size += 8; 3059 if (info->shared) 3060 htab->srelgot->size += sizeof (Elf32_External_Rela); 3061 } 3062 else 3063 htab->tlsld_got.offset = (bfd_vma) -1; 3064 3065 if (elf_hash_table (info)->dynamic_sections_created) 3066 { 3067 /* Make space for the trailing nop in .plt. */ 3068 if (htab->splt->size > 0) 3069 htab->splt->size += 4; 3070 } 3071 3072 /* The check_relocs and adjust_dynamic_symbol entry points have 3073 determined the sizes of the various dynamic sections. Allocate 3074 memory for them. */ 3075 for (s = dynobj->sections; s != NULL; s = s->next) 3076 { 3077 const char *name; 3078 bfd_boolean strip = FALSE; 3079 3080 if ((s->flags & SEC_LINKER_CREATED) == 0) 3081 continue; 3082 3083 /* It's OK to base decisions on the section name, because none 3084 of the dynobj section names depend upon the input files. */ 3085 name = bfd_get_section_name (dynobj, s); 3086 3087 if (strncmp (name, ".rela", 5) == 0) 3088 { 3089 if (s->size == 0) 3090 { 3091 /* If we don't need this section, strip it from the 3092 output file. This is to handle .rela.bss and 3093 .rela.plt. We must create it in 3094 create_dynamic_sections, because it must be created 3095 before the linker maps input sections to output 3096 sections. The linker does that before 3097 adjust_dynamic_symbol is called, and it is that 3098 function which decides whether anything needs to go 3099 into these sections. */ 3100 strip = TRUE; 3101 } 3102 else 3103 { 3104 /* We use the reloc_count field as a counter if we need 3105 to copy relocs into the output file. */ 3106 s->reloc_count = 0; 3107 } 3108 } 3109 else if (s != htab->splt && s != htab->sgot && s != htab->sgotplt) 3110 { 3111 /* It's not one of our sections, so don't allocate space. */ 3112 continue; 3113 } 3114 3115 if (strip) 3116 { 3117 s->flags |= SEC_EXCLUDE; 3118 continue; 3119 } 3120 3121 /* Allocate memory for the section contents. */ 3122 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. 3123 Unused entries should be reclaimed before the section's contents 3124 are written out, but at the moment this does not happen. Thus in 3125 order to prevent writing out garbage, we initialise the section's 3126 contents to zero. */ 3127 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 3128 if (s->contents == NULL && s->size != 0) 3129 return FALSE; 3130 } 3131 3132 if (elf_hash_table (info)->dynamic_sections_created) 3133 { 3134 /* Add some entries to the .dynamic section. We fill in the 3135 values later, in microblaze_elf_finish_dynamic_sections, but we 3136 must add the entries now so that we get the correct size for 3137 the .dynamic section. The DT_DEBUG entry is filled in by the 3138 dynamic linker and used by the debugger. */ 3139 #define add_dynamic_entry(TAG, VAL) \ 3140 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 3141 3142 if (info->executable) 3143 { 3144 if (!add_dynamic_entry (DT_DEBUG, 0)) 3145 return FALSE; 3146 } 3147 3148 if (!add_dynamic_entry (DT_RELA, 0) 3149 || !add_dynamic_entry (DT_RELASZ, 0) 3150 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 3151 return FALSE; 3152 3153 if (htab->splt->size != 0) 3154 { 3155 if (!add_dynamic_entry (DT_PLTGOT, 0) 3156 || !add_dynamic_entry (DT_PLTRELSZ, 0) 3157 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 3158 || !add_dynamic_entry (DT_JMPREL, 0) 3159 || !add_dynamic_entry (DT_BIND_NOW, 1)) 3160 return FALSE; 3161 } 3162 3163 if (info->flags & DF_TEXTREL) 3164 { 3165 if (!add_dynamic_entry (DT_TEXTREL, 0)) 3166 return FALSE; 3167 } 3168 } 3169 #undef add_dynamic_entry 3170 return TRUE; 3171 } 3172 3173 /* Finish up dynamic symbol handling. We set the contents of various 3174 dynamic sections here. */ 3175 3176 static bfd_boolean 3177 microblaze_elf_finish_dynamic_symbol (bfd *output_bfd, 3178 struct bfd_link_info *info, 3179 struct elf_link_hash_entry *h, 3180 Elf_Internal_Sym *sym) 3181 { 3182 struct elf32_mb_link_hash_table *htab; 3183 struct elf32_mb_link_hash_entry *eh = elf32_mb_hash_entry(h); 3184 3185 htab = elf32_mb_hash_table (info); 3186 if (htab == NULL) 3187 return FALSE; 3188 3189 if (h->plt.offset != (bfd_vma) -1) 3190 { 3191 asection *splt; 3192 asection *srela; 3193 asection *sgotplt; 3194 Elf_Internal_Rela rela; 3195 bfd_byte *loc; 3196 bfd_vma plt_index; 3197 bfd_vma got_offset; 3198 bfd_vma got_addr; 3199 3200 /* This symbol has an entry in the procedure linkage table. Set 3201 it up. */ 3202 BFD_ASSERT (h->dynindx != -1); 3203 3204 splt = htab->splt; 3205 srela = htab->srelplt; 3206 sgotplt = htab->sgotplt; 3207 BFD_ASSERT (splt != NULL && srela != NULL && sgotplt != NULL); 3208 3209 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; /* first entry reserved. */ 3210 got_offset = (plt_index + 3) * 4; /* 3 reserved ??? */ 3211 got_addr = got_offset; 3212 3213 /* For non-PIC objects we need absolute address of the GOT entry. */ 3214 if (!info->shared) 3215 got_addr += htab->sgotplt->output_section->vma + sgotplt->output_offset; 3216 3217 /* Fill in the entry in the procedure linkage table. */ 3218 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_0 + ((got_addr >> 16) & 0xffff), 3219 splt->contents + h->plt.offset); 3220 if (info->shared) 3221 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_1 + (got_addr & 0xffff), 3222 splt->contents + h->plt.offset + 4); 3223 else 3224 bfd_put_32 (output_bfd, PLT_ENTRY_WORD_1_NOPIC + (got_addr & 0xffff), 3225 splt->contents + h->plt.offset + 4); 3226 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD_2, 3227 splt->contents + h->plt.offset + 8); 3228 bfd_put_32 (output_bfd, (bfd_vma) PLT_ENTRY_WORD_3, 3229 splt->contents + h->plt.offset + 12); 3230 3231 /* Any additions to the .got section??? */ 3232 /* bfd_put_32 (output_bfd, 3233 splt->output_section->vma + splt->output_offset + h->plt.offset + 4, 3234 sgotplt->contents + got_offset); */ 3235 3236 /* Fill in the entry in the .rela.plt section. */ 3237 rela.r_offset = (sgotplt->output_section->vma 3238 + sgotplt->output_offset 3239 + got_offset); 3240 rela.r_info = ELF32_R_INFO (h->dynindx, R_MICROBLAZE_JUMP_SLOT); 3241 rela.r_addend = 0; 3242 loc = srela->contents; 3243 loc += plt_index * sizeof (Elf32_External_Rela); 3244 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3245 3246 if (!h->def_regular) 3247 { 3248 /* Mark the symbol as undefined, rather than as defined in 3249 the .plt section. Zero the value. */ 3250 sym->st_shndx = SHN_UNDEF; 3251 sym->st_value = 0; 3252 } 3253 } 3254 3255 /* h->got.refcount to be checked ? */ 3256 if (h->got.offset != (bfd_vma) -1 && 3257 ! ((h->got.offset & 1) || 3258 IS_TLS_LD(eh->tls_mask) || IS_TLS_GD(eh->tls_mask))) 3259 { 3260 asection *sgot; 3261 asection *srela; 3262 bfd_vma offset; 3263 3264 /* This symbol has an entry in the global offset table. Set it 3265 up. */ 3266 3267 sgot = htab->sgot; 3268 srela = htab->srelgot; 3269 BFD_ASSERT (sgot != NULL && srela != NULL); 3270 3271 offset = (sgot->output_section->vma + sgot->output_offset 3272 + (h->got.offset &~ (bfd_vma) 1)); 3273 3274 /* If this is a -Bsymbolic link, and the symbol is defined 3275 locally, we just want to emit a RELATIVE reloc. Likewise if 3276 the symbol was forced to be local because of a version file. 3277 The entry in the global offset table will already have been 3278 initialized in the relocate_section function. */ 3279 if (info->shared 3280 && (info->symbolic || h->dynindx == -1) 3281 && h->def_regular) 3282 { 3283 asection *sec = h->root.u.def.section; 3284 microblaze_elf_output_dynamic_relocation (output_bfd, 3285 srela, srela->reloc_count++, 3286 /* symindex= */ 0, 3287 R_MICROBLAZE_REL, offset, 3288 h->root.u.def.value 3289 + sec->output_section->vma 3290 + sec->output_offset); 3291 } 3292 else 3293 { 3294 microblaze_elf_output_dynamic_relocation (output_bfd, 3295 srela, srela->reloc_count++, 3296 h->dynindx, 3297 R_MICROBLAZE_GLOB_DAT, 3298 offset, 0); 3299 } 3300 3301 bfd_put_32 (output_bfd, (bfd_vma) 0, 3302 sgot->contents + (h->got.offset &~ (bfd_vma) 1)); 3303 } 3304 3305 if (h->needs_copy) 3306 { 3307 asection *s; 3308 Elf_Internal_Rela rela; 3309 bfd_byte *loc; 3310 3311 /* This symbols needs a copy reloc. Set it up. */ 3312 3313 BFD_ASSERT (h->dynindx != -1); 3314 3315 s = bfd_get_linker_section (htab->elf.dynobj, ".rela.bss"); 3316 BFD_ASSERT (s != NULL); 3317 3318 rela.r_offset = (h->root.u.def.value 3319 + h->root.u.def.section->output_section->vma 3320 + h->root.u.def.section->output_offset); 3321 rela.r_info = ELF32_R_INFO (h->dynindx, R_MICROBLAZE_COPY); 3322 rela.r_addend = 0; 3323 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 3324 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 3325 } 3326 3327 /* Mark some specially defined symbols as absolute. */ 3328 if (h == htab->elf.hdynamic 3329 || h == htab->elf.hgot 3330 || h == htab->elf.hplt) 3331 sym->st_shndx = SHN_ABS; 3332 3333 return TRUE; 3334 } 3335 3336 3337 /* Finish up the dynamic sections. */ 3338 3339 static bfd_boolean 3340 microblaze_elf_finish_dynamic_sections (bfd *output_bfd, 3341 struct bfd_link_info *info) 3342 { 3343 bfd *dynobj; 3344 asection *sdyn, *sgot; 3345 struct elf32_mb_link_hash_table *htab; 3346 3347 htab = elf32_mb_hash_table (info); 3348 if (htab == NULL) 3349 return FALSE; 3350 3351 dynobj = htab->elf.dynobj; 3352 3353 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 3354 3355 if (htab->elf.dynamic_sections_created) 3356 { 3357 asection *splt; 3358 Elf32_External_Dyn *dyncon, *dynconend; 3359 3360 splt = bfd_get_linker_section (dynobj, ".plt"); 3361 BFD_ASSERT (splt != NULL && sdyn != NULL); 3362 3363 dyncon = (Elf32_External_Dyn *) sdyn->contents; 3364 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 3365 for (; dyncon < dynconend; dyncon++) 3366 { 3367 Elf_Internal_Dyn dyn; 3368 const char *name; 3369 bfd_boolean size; 3370 3371 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 3372 3373 switch (dyn.d_tag) 3374 { 3375 case DT_PLTGOT: name = ".got.plt"; size = FALSE; break; 3376 case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break; 3377 case DT_JMPREL: name = ".rela.plt"; size = FALSE; break; 3378 case DT_RELA: name = ".rela.dyn"; size = FALSE; break; 3379 case DT_RELASZ: name = ".rela.dyn"; size = TRUE; break; 3380 default: name = NULL; size = FALSE; break; 3381 } 3382 3383 if (name != NULL) 3384 { 3385 asection *s; 3386 3387 s = bfd_get_section_by_name (output_bfd, name); 3388 if (s == NULL) 3389 dyn.d_un.d_val = 0; 3390 else 3391 { 3392 if (! size) 3393 dyn.d_un.d_ptr = s->vma; 3394 else 3395 dyn.d_un.d_val = s->size; 3396 } 3397 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3398 } 3399 } 3400 3401 /* Clear the first entry in the procedure linkage table, 3402 and put a nop in the last four bytes. */ 3403 if (splt->size > 0) 3404 { 3405 memset (splt->contents, 0, PLT_ENTRY_SIZE); 3406 bfd_put_32 (output_bfd, (bfd_vma) 0x80000000 /* nop. */, 3407 splt->contents + splt->size - 4); 3408 } 3409 3410 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; 3411 } 3412 3413 /* Set the first entry in the global offset table to the address of 3414 the dynamic section. */ 3415 sgot = bfd_get_linker_section (dynobj, ".got.plt"); 3416 if (sgot && sgot->size > 0) 3417 { 3418 if (sdyn == NULL) 3419 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 3420 else 3421 bfd_put_32 (output_bfd, 3422 sdyn->output_section->vma + sdyn->output_offset, 3423 sgot->contents); 3424 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 3425 } 3426 3427 if (htab->sgot && htab->sgot->size > 0) 3428 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4; 3429 3430 return TRUE; 3431 } 3432 3433 /* Hook called by the linker routine which adds symbols from an object 3434 file. We use it to put .comm items in .sbss, and not .bss. */ 3435 3436 static bfd_boolean 3437 microblaze_elf_add_symbol_hook (bfd *abfd, 3438 struct bfd_link_info *info, 3439 Elf_Internal_Sym *sym, 3440 const char **namep ATTRIBUTE_UNUSED, 3441 flagword *flagsp ATTRIBUTE_UNUSED, 3442 asection **secp, 3443 bfd_vma *valp) 3444 { 3445 if (sym->st_shndx == SHN_COMMON 3446 && !info->relocatable 3447 && sym->st_size <= elf_gp_size (abfd)) 3448 { 3449 /* Common symbols less than or equal to -G nn bytes are automatically 3450 put into .sbss. */ 3451 *secp = bfd_make_section_old_way (abfd, ".sbss"); 3452 if (*secp == NULL 3453 || ! bfd_set_section_flags (abfd, *secp, SEC_IS_COMMON)) 3454 return FALSE; 3455 3456 *valp = sym->st_size; 3457 } 3458 3459 return TRUE; 3460 } 3461 3462 #define TARGET_LITTLE_SYM bfd_elf32_microblazeel_vec 3463 #define TARGET_LITTLE_NAME "elf32-microblazeel" 3464 3465 #define TARGET_BIG_SYM bfd_elf32_microblaze_vec 3466 #define TARGET_BIG_NAME "elf32-microblaze" 3467 3468 #define ELF_ARCH bfd_arch_microblaze 3469 #define ELF_TARGET_ID MICROBLAZE_ELF_DATA 3470 #define ELF_MACHINE_CODE EM_MICROBLAZE 3471 #define ELF_MACHINE_ALT1 EM_MICROBLAZE_OLD 3472 #define ELF_MAXPAGESIZE 0x1000 3473 #define elf_info_to_howto microblaze_elf_info_to_howto 3474 #define elf_info_to_howto_rel NULL 3475 3476 #define bfd_elf32_bfd_reloc_type_lookup microblaze_elf_reloc_type_lookup 3477 #define bfd_elf32_bfd_is_local_label_name microblaze_elf_is_local_label_name 3478 #define elf_backend_relocate_section microblaze_elf_relocate_section 3479 #define bfd_elf32_bfd_relax_section microblaze_elf_relax_section 3480 #define bfd_elf32_bfd_merge_private_bfd_data microblaze_elf_merge_private_bfd_data 3481 #define bfd_elf32_bfd_reloc_name_lookup microblaze_elf_reloc_name_lookup 3482 3483 #define elf_backend_gc_mark_hook microblaze_elf_gc_mark_hook 3484 #define elf_backend_gc_sweep_hook microblaze_elf_gc_sweep_hook 3485 #define elf_backend_check_relocs microblaze_elf_check_relocs 3486 #define elf_backend_copy_indirect_symbol microblaze_elf_copy_indirect_symbol 3487 #define bfd_elf32_bfd_link_hash_table_create microblaze_elf_link_hash_table_create 3488 #define elf_backend_can_gc_sections 1 3489 #define elf_backend_can_refcount 1 3490 #define elf_backend_want_got_plt 1 3491 #define elf_backend_plt_readonly 1 3492 #define elf_backend_got_header_size 12 3493 #define elf_backend_rela_normal 1 3494 3495 #define elf_backend_adjust_dynamic_symbol microblaze_elf_adjust_dynamic_symbol 3496 #define elf_backend_create_dynamic_sections microblaze_elf_create_dynamic_sections 3497 #define elf_backend_finish_dynamic_sections microblaze_elf_finish_dynamic_sections 3498 #define elf_backend_finish_dynamic_symbol microblaze_elf_finish_dynamic_symbol 3499 #define elf_backend_size_dynamic_sections microblaze_elf_size_dynamic_sections 3500 #define elf_backend_add_symbol_hook microblaze_elf_add_symbol_hook 3501 3502 #include "elf32-target.h" 3503