1/* MMIX-specific support for 64-bit ELF. 2 Copyright (C) 2001-2017 Free Software Foundation, Inc. 3 Contributed by Hans-Peter Nilsson <hp@bitrange.com> 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 23/* No specific ABI or "processor-specific supplement" defined. */ 24 25/* TODO: 26 - "Traditional" linker relaxation (shrinking whole sections). 27 - Merge reloc stubs jumping to same location. 28 - GETA stub relaxation (call a stub for out of range new 29 R_MMIX_GETA_STUBBABLE). */ 30 31#include "sysdep.h" 32#include "bfd.h" 33#include "libbfd.h" 34#include "elf-bfd.h" 35#include "elf/mmix.h" 36#include "opcode/mmix.h" 37 38#define MINUS_ONE (((bfd_vma) 0) - 1) 39 40#define MAX_PUSHJ_STUB_SIZE (5 * 4) 41 42/* Put these everywhere in new code. */ 43#define FATAL_DEBUG \ 44 _bfd_abort (__FILE__, __LINE__, \ 45 "Internal: Non-debugged code (test-case missing)") 46 47#define BAD_CASE(x) \ 48 _bfd_abort (__FILE__, __LINE__, \ 49 "bad case for " #x) 50 51struct _mmix_elf_section_data 52{ 53 struct bfd_elf_section_data elf; 54 union 55 { 56 struct bpo_reloc_section_info *reloc; 57 struct bpo_greg_section_info *greg; 58 } bpo; 59 60 struct pushj_stub_info 61 { 62 /* Maximum number of stubs needed for this section. */ 63 bfd_size_type n_pushj_relocs; 64 65 /* Size of stubs after a mmix_elf_relax_section round. */ 66 bfd_size_type stubs_size_sum; 67 68 /* Per-reloc stubs_size_sum information. The stubs_size_sum member is the sum 69 of these. Allocated in mmix_elf_check_common_relocs. */ 70 bfd_size_type *stub_size; 71 72 /* Offset of next stub during relocation. Somewhat redundant with the 73 above: error coverage is easier and we don't have to reset the 74 stubs_size_sum for relocation. */ 75 bfd_size_type stub_offset; 76 } pjs; 77 78 /* Whether there has been a warning that this section could not be 79 linked due to a specific cause. FIXME: a way to access the 80 linker info or output section, then stuff the limiter guard 81 there. */ 82 bfd_boolean has_warned_bpo; 83 bfd_boolean has_warned_pushj; 84}; 85 86#define mmix_elf_section_data(sec) \ 87 ((struct _mmix_elf_section_data *) elf_section_data (sec)) 88 89/* For each section containing a base-plus-offset (BPO) reloc, we attach 90 this struct as mmix_elf_section_data (section)->bpo, which is otherwise 91 NULL. */ 92struct bpo_reloc_section_info 93 { 94 /* The base is 1; this is the first number in this section. */ 95 size_t first_base_plus_offset_reloc; 96 97 /* Number of BPO-relocs in this section. */ 98 size_t n_bpo_relocs_this_section; 99 100 /* Running index, used at relocation time. */ 101 size_t bpo_index; 102 103 /* We don't have access to the bfd_link_info struct in 104 mmix_final_link_relocate. What we really want to get at is the 105 global single struct greg_relocation, so we stash it here. */ 106 asection *bpo_greg_section; 107 }; 108 109/* Helper struct (in global context) for the one below. 110 There's one of these created for every BPO reloc. */ 111struct bpo_reloc_request 112 { 113 bfd_vma value; 114 115 /* Valid after relaxation. The base is 0; the first register number 116 must be added. The offset is in range 0..255. */ 117 size_t regindex; 118 size_t offset; 119 120 /* The order number for this BPO reloc, corresponding to the order in 121 which BPO relocs were found. Used to create an index after reloc 122 requests are sorted. */ 123 size_t bpo_reloc_no; 124 125 /* Set when the value is computed. Better than coding "guard values" 126 into the other members. Is FALSE only for BPO relocs in a GC:ed 127 section. */ 128 bfd_boolean valid; 129 }; 130 131/* We attach this as mmix_elf_section_data (sec)->bpo in the linker-allocated 132 greg contents section (MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME), 133 which is linked into the register contents section 134 (MMIX_REG_CONTENTS_SECTION_NAME). This section is created by the 135 linker; using the same hook as for usual with BPO relocs does not 136 collide. */ 137struct bpo_greg_section_info 138 { 139 /* After GC, this reflects the number of remaining, non-excluded 140 BPO-relocs. */ 141 size_t n_bpo_relocs; 142 143 /* This is the number of allocated bpo_reloc_requests; the size of 144 sorted_indexes. Valid after the check.*relocs functions are called 145 for all incoming sections. It includes the number of BPO relocs in 146 sections that were GC:ed. */ 147 size_t n_max_bpo_relocs; 148 149 /* A counter used to find out when to fold the BPO gregs, since we 150 don't have a single "after-relaxation" hook. */ 151 size_t n_remaining_bpo_relocs_this_relaxation_round; 152 153 /* The number of linker-allocated GREGs resulting from BPO relocs. 154 This is an approximation after _bfd_mmix_before_linker_allocation 155 and supposedly accurate after mmix_elf_relax_section is called for 156 all incoming non-collected sections. */ 157 size_t n_allocated_bpo_gregs; 158 159 /* Index into reloc_request[], sorted on increasing "value", secondary 160 by increasing index for strict sorting order. */ 161 size_t *bpo_reloc_indexes; 162 163 /* An array of all relocations, with the "value" member filled in by 164 the relaxation function. */ 165 struct bpo_reloc_request *reloc_request; 166 }; 167 168 169extern bfd_boolean mmix_elf_final_link (bfd *, struct bfd_link_info *); 170 171extern void mmix_elf_symbol_processing (bfd *, asymbol *); 172 173/* Only intended to be called from a debugger. */ 174extern void mmix_dump_bpo_gregs 175 (struct bfd_link_info *, void (*) (const char *, ...)); 176 177static void 178mmix_set_relaxable_size (bfd *, asection *, void *); 179static bfd_reloc_status_type 180mmix_elf_reloc (bfd *, arelent *, asymbol *, void *, 181 asection *, bfd *, char **); 182static bfd_reloc_status_type 183mmix_final_link_relocate (reloc_howto_type *, asection *, bfd_byte *, bfd_vma, 184 bfd_signed_vma, bfd_vma, const char *, asection *, 185 char **); 186 187 188/* Watch out: this currently needs to have elements with the same index as 189 their R_MMIX_ number. */ 190static reloc_howto_type elf_mmix_howto_table[] = 191 { 192 /* This reloc does nothing. */ 193 HOWTO (R_MMIX_NONE, /* type */ 194 0, /* rightshift */ 195 3, /* size (0 = byte, 1 = short, 2 = long) */ 196 0, /* bitsize */ 197 FALSE, /* pc_relative */ 198 0, /* bitpos */ 199 complain_overflow_dont, /* complain_on_overflow */ 200 bfd_elf_generic_reloc, /* special_function */ 201 "R_MMIX_NONE", /* name */ 202 FALSE, /* partial_inplace */ 203 0, /* src_mask */ 204 0, /* dst_mask */ 205 FALSE), /* pcrel_offset */ 206 207 /* An 8 bit absolute relocation. */ 208 HOWTO (R_MMIX_8, /* type */ 209 0, /* rightshift */ 210 0, /* size (0 = byte, 1 = short, 2 = long) */ 211 8, /* bitsize */ 212 FALSE, /* pc_relative */ 213 0, /* bitpos */ 214 complain_overflow_bitfield, /* complain_on_overflow */ 215 bfd_elf_generic_reloc, /* special_function */ 216 "R_MMIX_8", /* name */ 217 FALSE, /* partial_inplace */ 218 0, /* src_mask */ 219 0xff, /* dst_mask */ 220 FALSE), /* pcrel_offset */ 221 222 /* An 16 bit absolute relocation. */ 223 HOWTO (R_MMIX_16, /* type */ 224 0, /* rightshift */ 225 1, /* size (0 = byte, 1 = short, 2 = long) */ 226 16, /* bitsize */ 227 FALSE, /* pc_relative */ 228 0, /* bitpos */ 229 complain_overflow_bitfield, /* complain_on_overflow */ 230 bfd_elf_generic_reloc, /* special_function */ 231 "R_MMIX_16", /* name */ 232 FALSE, /* partial_inplace */ 233 0, /* src_mask */ 234 0xffff, /* dst_mask */ 235 FALSE), /* pcrel_offset */ 236 237 /* An 24 bit absolute relocation. */ 238 HOWTO (R_MMIX_24, /* type */ 239 0, /* rightshift */ 240 2, /* size (0 = byte, 1 = short, 2 = long) */ 241 24, /* bitsize */ 242 FALSE, /* pc_relative */ 243 0, /* bitpos */ 244 complain_overflow_bitfield, /* complain_on_overflow */ 245 bfd_elf_generic_reloc, /* special_function */ 246 "R_MMIX_24", /* name */ 247 FALSE, /* partial_inplace */ 248 ~0xffffff, /* src_mask */ 249 0xffffff, /* dst_mask */ 250 FALSE), /* pcrel_offset */ 251 252 /* A 32 bit absolute relocation. */ 253 HOWTO (R_MMIX_32, /* type */ 254 0, /* rightshift */ 255 2, /* size (0 = byte, 1 = short, 2 = long) */ 256 32, /* bitsize */ 257 FALSE, /* pc_relative */ 258 0, /* bitpos */ 259 complain_overflow_bitfield, /* complain_on_overflow */ 260 bfd_elf_generic_reloc, /* special_function */ 261 "R_MMIX_32", /* name */ 262 FALSE, /* partial_inplace */ 263 0, /* src_mask */ 264 0xffffffff, /* dst_mask */ 265 FALSE), /* pcrel_offset */ 266 267 /* 64 bit relocation. */ 268 HOWTO (R_MMIX_64, /* type */ 269 0, /* rightshift */ 270 4, /* size (0 = byte, 1 = short, 2 = long) */ 271 64, /* bitsize */ 272 FALSE, /* pc_relative */ 273 0, /* bitpos */ 274 complain_overflow_bitfield, /* complain_on_overflow */ 275 bfd_elf_generic_reloc, /* special_function */ 276 "R_MMIX_64", /* name */ 277 FALSE, /* partial_inplace */ 278 0, /* src_mask */ 279 MINUS_ONE, /* dst_mask */ 280 FALSE), /* pcrel_offset */ 281 282 /* An 8 bit PC-relative relocation. */ 283 HOWTO (R_MMIX_PC_8, /* type */ 284 0, /* rightshift */ 285 0, /* size (0 = byte, 1 = short, 2 = long) */ 286 8, /* bitsize */ 287 TRUE, /* pc_relative */ 288 0, /* bitpos */ 289 complain_overflow_bitfield, /* complain_on_overflow */ 290 bfd_elf_generic_reloc, /* special_function */ 291 "R_MMIX_PC_8", /* name */ 292 FALSE, /* partial_inplace */ 293 0, /* src_mask */ 294 0xff, /* dst_mask */ 295 TRUE), /* pcrel_offset */ 296 297 /* An 16 bit PC-relative relocation. */ 298 HOWTO (R_MMIX_PC_16, /* type */ 299 0, /* rightshift */ 300 1, /* size (0 = byte, 1 = short, 2 = long) */ 301 16, /* bitsize */ 302 TRUE, /* pc_relative */ 303 0, /* bitpos */ 304 complain_overflow_bitfield, /* complain_on_overflow */ 305 bfd_elf_generic_reloc, /* special_function */ 306 "R_MMIX_PC_16", /* name */ 307 FALSE, /* partial_inplace */ 308 0, /* src_mask */ 309 0xffff, /* dst_mask */ 310 TRUE), /* pcrel_offset */ 311 312 /* An 24 bit PC-relative relocation. */ 313 HOWTO (R_MMIX_PC_24, /* type */ 314 0, /* rightshift */ 315 2, /* size (0 = byte, 1 = short, 2 = long) */ 316 24, /* bitsize */ 317 TRUE, /* pc_relative */ 318 0, /* bitpos */ 319 complain_overflow_bitfield, /* complain_on_overflow */ 320 bfd_elf_generic_reloc, /* special_function */ 321 "R_MMIX_PC_24", /* name */ 322 FALSE, /* partial_inplace */ 323 ~0xffffff, /* src_mask */ 324 0xffffff, /* dst_mask */ 325 TRUE), /* pcrel_offset */ 326 327 /* A 32 bit absolute PC-relative relocation. */ 328 HOWTO (R_MMIX_PC_32, /* type */ 329 0, /* rightshift */ 330 2, /* size (0 = byte, 1 = short, 2 = long) */ 331 32, /* bitsize */ 332 TRUE, /* pc_relative */ 333 0, /* bitpos */ 334 complain_overflow_bitfield, /* complain_on_overflow */ 335 bfd_elf_generic_reloc, /* special_function */ 336 "R_MMIX_PC_32", /* name */ 337 FALSE, /* partial_inplace */ 338 0, /* src_mask */ 339 0xffffffff, /* dst_mask */ 340 TRUE), /* pcrel_offset */ 341 342 /* 64 bit PC-relative relocation. */ 343 HOWTO (R_MMIX_PC_64, /* type */ 344 0, /* rightshift */ 345 4, /* size (0 = byte, 1 = short, 2 = long) */ 346 64, /* bitsize */ 347 TRUE, /* pc_relative */ 348 0, /* bitpos */ 349 complain_overflow_bitfield, /* complain_on_overflow */ 350 bfd_elf_generic_reloc, /* special_function */ 351 "R_MMIX_PC_64", /* name */ 352 FALSE, /* partial_inplace */ 353 0, /* src_mask */ 354 MINUS_ONE, /* dst_mask */ 355 TRUE), /* pcrel_offset */ 356 357 /* GNU extension to record C++ vtable hierarchy. */ 358 HOWTO (R_MMIX_GNU_VTINHERIT, /* type */ 359 0, /* rightshift */ 360 0, /* size (0 = byte, 1 = short, 2 = long) */ 361 0, /* bitsize */ 362 FALSE, /* pc_relative */ 363 0, /* bitpos */ 364 complain_overflow_dont, /* complain_on_overflow */ 365 NULL, /* special_function */ 366 "R_MMIX_GNU_VTINHERIT", /* name */ 367 FALSE, /* partial_inplace */ 368 0, /* src_mask */ 369 0, /* dst_mask */ 370 TRUE), /* pcrel_offset */ 371 372 /* GNU extension to record C++ vtable member usage. */ 373 HOWTO (R_MMIX_GNU_VTENTRY, /* type */ 374 0, /* rightshift */ 375 0, /* size (0 = byte, 1 = short, 2 = long) */ 376 0, /* bitsize */ 377 FALSE, /* pc_relative */ 378 0, /* bitpos */ 379 complain_overflow_dont, /* complain_on_overflow */ 380 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 381 "R_MMIX_GNU_VTENTRY", /* name */ 382 FALSE, /* partial_inplace */ 383 0, /* src_mask */ 384 0, /* dst_mask */ 385 FALSE), /* pcrel_offset */ 386 387 /* The GETA relocation is supposed to get any address that could 388 possibly be reached by the GETA instruction. It can silently expand 389 to get a 64-bit operand, but will complain if any of the two least 390 significant bits are set. The howto members reflect a simple GETA. */ 391 HOWTO (R_MMIX_GETA, /* type */ 392 2, /* rightshift */ 393 2, /* size (0 = byte, 1 = short, 2 = long) */ 394 19, /* bitsize */ 395 TRUE, /* pc_relative */ 396 0, /* bitpos */ 397 complain_overflow_signed, /* complain_on_overflow */ 398 mmix_elf_reloc, /* special_function */ 399 "R_MMIX_GETA", /* name */ 400 FALSE, /* partial_inplace */ 401 ~0x0100ffff, /* src_mask */ 402 0x0100ffff, /* dst_mask */ 403 TRUE), /* pcrel_offset */ 404 405 HOWTO (R_MMIX_GETA_1, /* type */ 406 2, /* rightshift */ 407 2, /* size (0 = byte, 1 = short, 2 = long) */ 408 19, /* bitsize */ 409 TRUE, /* pc_relative */ 410 0, /* bitpos */ 411 complain_overflow_signed, /* complain_on_overflow */ 412 mmix_elf_reloc, /* special_function */ 413 "R_MMIX_GETA_1", /* name */ 414 FALSE, /* partial_inplace */ 415 ~0x0100ffff, /* src_mask */ 416 0x0100ffff, /* dst_mask */ 417 TRUE), /* pcrel_offset */ 418 419 HOWTO (R_MMIX_GETA_2, /* type */ 420 2, /* rightshift */ 421 2, /* size (0 = byte, 1 = short, 2 = long) */ 422 19, /* bitsize */ 423 TRUE, /* pc_relative */ 424 0, /* bitpos */ 425 complain_overflow_signed, /* complain_on_overflow */ 426 mmix_elf_reloc, /* special_function */ 427 "R_MMIX_GETA_2", /* name */ 428 FALSE, /* partial_inplace */ 429 ~0x0100ffff, /* src_mask */ 430 0x0100ffff, /* dst_mask */ 431 TRUE), /* pcrel_offset */ 432 433 HOWTO (R_MMIX_GETA_3, /* type */ 434 2, /* rightshift */ 435 2, /* size (0 = byte, 1 = short, 2 = long) */ 436 19, /* bitsize */ 437 TRUE, /* pc_relative */ 438 0, /* bitpos */ 439 complain_overflow_signed, /* complain_on_overflow */ 440 mmix_elf_reloc, /* special_function */ 441 "R_MMIX_GETA_3", /* name */ 442 FALSE, /* partial_inplace */ 443 ~0x0100ffff, /* src_mask */ 444 0x0100ffff, /* dst_mask */ 445 TRUE), /* pcrel_offset */ 446 447 /* The conditional branches are supposed to reach any (code) address. 448 It can silently expand to a 64-bit operand, but will emit an error if 449 any of the two least significant bits are set. The howto members 450 reflect a simple branch. */ 451 HOWTO (R_MMIX_CBRANCH, /* type */ 452 2, /* rightshift */ 453 2, /* size (0 = byte, 1 = short, 2 = long) */ 454 19, /* bitsize */ 455 TRUE, /* pc_relative */ 456 0, /* bitpos */ 457 complain_overflow_signed, /* complain_on_overflow */ 458 mmix_elf_reloc, /* special_function */ 459 "R_MMIX_CBRANCH", /* name */ 460 FALSE, /* partial_inplace */ 461 ~0x0100ffff, /* src_mask */ 462 0x0100ffff, /* dst_mask */ 463 TRUE), /* pcrel_offset */ 464 465 HOWTO (R_MMIX_CBRANCH_J, /* type */ 466 2, /* rightshift */ 467 2, /* size (0 = byte, 1 = short, 2 = long) */ 468 19, /* bitsize */ 469 TRUE, /* pc_relative */ 470 0, /* bitpos */ 471 complain_overflow_signed, /* complain_on_overflow */ 472 mmix_elf_reloc, /* special_function */ 473 "R_MMIX_CBRANCH_J", /* name */ 474 FALSE, /* partial_inplace */ 475 ~0x0100ffff, /* src_mask */ 476 0x0100ffff, /* dst_mask */ 477 TRUE), /* pcrel_offset */ 478 479 HOWTO (R_MMIX_CBRANCH_1, /* type */ 480 2, /* rightshift */ 481 2, /* size (0 = byte, 1 = short, 2 = long) */ 482 19, /* bitsize */ 483 TRUE, /* pc_relative */ 484 0, /* bitpos */ 485 complain_overflow_signed, /* complain_on_overflow */ 486 mmix_elf_reloc, /* special_function */ 487 "R_MMIX_CBRANCH_1", /* name */ 488 FALSE, /* partial_inplace */ 489 ~0x0100ffff, /* src_mask */ 490 0x0100ffff, /* dst_mask */ 491 TRUE), /* pcrel_offset */ 492 493 HOWTO (R_MMIX_CBRANCH_2, /* type */ 494 2, /* rightshift */ 495 2, /* size (0 = byte, 1 = short, 2 = long) */ 496 19, /* bitsize */ 497 TRUE, /* pc_relative */ 498 0, /* bitpos */ 499 complain_overflow_signed, /* complain_on_overflow */ 500 mmix_elf_reloc, /* special_function */ 501 "R_MMIX_CBRANCH_2", /* name */ 502 FALSE, /* partial_inplace */ 503 ~0x0100ffff, /* src_mask */ 504 0x0100ffff, /* dst_mask */ 505 TRUE), /* pcrel_offset */ 506 507 HOWTO (R_MMIX_CBRANCH_3, /* type */ 508 2, /* rightshift */ 509 2, /* size (0 = byte, 1 = short, 2 = long) */ 510 19, /* bitsize */ 511 TRUE, /* pc_relative */ 512 0, /* bitpos */ 513 complain_overflow_signed, /* complain_on_overflow */ 514 mmix_elf_reloc, /* special_function */ 515 "R_MMIX_CBRANCH_3", /* name */ 516 FALSE, /* partial_inplace */ 517 ~0x0100ffff, /* src_mask */ 518 0x0100ffff, /* dst_mask */ 519 TRUE), /* pcrel_offset */ 520 521 /* The PUSHJ instruction can reach any (code) address, as long as it's 522 the beginning of a function (no usable restriction). It can silently 523 expand to a 64-bit operand, but will emit an error if any of the two 524 least significant bits are set. It can also expand into a call to a 525 stub; see R_MMIX_PUSHJ_STUBBABLE. The howto members reflect a simple 526 PUSHJ. */ 527 HOWTO (R_MMIX_PUSHJ, /* type */ 528 2, /* rightshift */ 529 2, /* size (0 = byte, 1 = short, 2 = long) */ 530 19, /* bitsize */ 531 TRUE, /* pc_relative */ 532 0, /* bitpos */ 533 complain_overflow_signed, /* complain_on_overflow */ 534 mmix_elf_reloc, /* special_function */ 535 "R_MMIX_PUSHJ", /* name */ 536 FALSE, /* partial_inplace */ 537 ~0x0100ffff, /* src_mask */ 538 0x0100ffff, /* dst_mask */ 539 TRUE), /* pcrel_offset */ 540 541 HOWTO (R_MMIX_PUSHJ_1, /* type */ 542 2, /* rightshift */ 543 2, /* size (0 = byte, 1 = short, 2 = long) */ 544 19, /* bitsize */ 545 TRUE, /* pc_relative */ 546 0, /* bitpos */ 547 complain_overflow_signed, /* complain_on_overflow */ 548 mmix_elf_reloc, /* special_function */ 549 "R_MMIX_PUSHJ_1", /* name */ 550 FALSE, /* partial_inplace */ 551 ~0x0100ffff, /* src_mask */ 552 0x0100ffff, /* dst_mask */ 553 TRUE), /* pcrel_offset */ 554 555 HOWTO (R_MMIX_PUSHJ_2, /* type */ 556 2, /* rightshift */ 557 2, /* size (0 = byte, 1 = short, 2 = long) */ 558 19, /* bitsize */ 559 TRUE, /* pc_relative */ 560 0, /* bitpos */ 561 complain_overflow_signed, /* complain_on_overflow */ 562 mmix_elf_reloc, /* special_function */ 563 "R_MMIX_PUSHJ_2", /* name */ 564 FALSE, /* partial_inplace */ 565 ~0x0100ffff, /* src_mask */ 566 0x0100ffff, /* dst_mask */ 567 TRUE), /* pcrel_offset */ 568 569 HOWTO (R_MMIX_PUSHJ_3, /* type */ 570 2, /* rightshift */ 571 2, /* size (0 = byte, 1 = short, 2 = long) */ 572 19, /* bitsize */ 573 TRUE, /* pc_relative */ 574 0, /* bitpos */ 575 complain_overflow_signed, /* complain_on_overflow */ 576 mmix_elf_reloc, /* special_function */ 577 "R_MMIX_PUSHJ_3", /* name */ 578 FALSE, /* partial_inplace */ 579 ~0x0100ffff, /* src_mask */ 580 0x0100ffff, /* dst_mask */ 581 TRUE), /* pcrel_offset */ 582 583 /* A JMP is supposed to reach any (code) address. By itself, it can 584 reach +-64M; the expansion can reach all 64 bits. Note that the 64M 585 limit is soon reached if you link the program in wildly different 586 memory segments. The howto members reflect a trivial JMP. */ 587 HOWTO (R_MMIX_JMP, /* type */ 588 2, /* rightshift */ 589 2, /* size (0 = byte, 1 = short, 2 = long) */ 590 27, /* bitsize */ 591 TRUE, /* pc_relative */ 592 0, /* bitpos */ 593 complain_overflow_signed, /* complain_on_overflow */ 594 mmix_elf_reloc, /* special_function */ 595 "R_MMIX_JMP", /* name */ 596 FALSE, /* partial_inplace */ 597 ~0x1ffffff, /* src_mask */ 598 0x1ffffff, /* dst_mask */ 599 TRUE), /* pcrel_offset */ 600 601 HOWTO (R_MMIX_JMP_1, /* type */ 602 2, /* rightshift */ 603 2, /* size (0 = byte, 1 = short, 2 = long) */ 604 27, /* bitsize */ 605 TRUE, /* pc_relative */ 606 0, /* bitpos */ 607 complain_overflow_signed, /* complain_on_overflow */ 608 mmix_elf_reloc, /* special_function */ 609 "R_MMIX_JMP_1", /* name */ 610 FALSE, /* partial_inplace */ 611 ~0x1ffffff, /* src_mask */ 612 0x1ffffff, /* dst_mask */ 613 TRUE), /* pcrel_offset */ 614 615 HOWTO (R_MMIX_JMP_2, /* type */ 616 2, /* rightshift */ 617 2, /* size (0 = byte, 1 = short, 2 = long) */ 618 27, /* bitsize */ 619 TRUE, /* pc_relative */ 620 0, /* bitpos */ 621 complain_overflow_signed, /* complain_on_overflow */ 622 mmix_elf_reloc, /* special_function */ 623 "R_MMIX_JMP_2", /* name */ 624 FALSE, /* partial_inplace */ 625 ~0x1ffffff, /* src_mask */ 626 0x1ffffff, /* dst_mask */ 627 TRUE), /* pcrel_offset */ 628 629 HOWTO (R_MMIX_JMP_3, /* type */ 630 2, /* rightshift */ 631 2, /* size (0 = byte, 1 = short, 2 = long) */ 632 27, /* bitsize */ 633 TRUE, /* pc_relative */ 634 0, /* bitpos */ 635 complain_overflow_signed, /* complain_on_overflow */ 636 mmix_elf_reloc, /* special_function */ 637 "R_MMIX_JMP_3", /* name */ 638 FALSE, /* partial_inplace */ 639 ~0x1ffffff, /* src_mask */ 640 0x1ffffff, /* dst_mask */ 641 TRUE), /* pcrel_offset */ 642 643 /* When we don't emit link-time-relaxable code from the assembler, or 644 when relaxation has done all it can do, these relocs are used. For 645 GETA/PUSHJ/branches. */ 646 HOWTO (R_MMIX_ADDR19, /* type */ 647 2, /* rightshift */ 648 2, /* size (0 = byte, 1 = short, 2 = long) */ 649 19, /* bitsize */ 650 TRUE, /* pc_relative */ 651 0, /* bitpos */ 652 complain_overflow_signed, /* complain_on_overflow */ 653 mmix_elf_reloc, /* special_function */ 654 "R_MMIX_ADDR19", /* name */ 655 FALSE, /* partial_inplace */ 656 ~0x0100ffff, /* src_mask */ 657 0x0100ffff, /* dst_mask */ 658 TRUE), /* pcrel_offset */ 659 660 /* For JMP. */ 661 HOWTO (R_MMIX_ADDR27, /* type */ 662 2, /* rightshift */ 663 2, /* size (0 = byte, 1 = short, 2 = long) */ 664 27, /* bitsize */ 665 TRUE, /* pc_relative */ 666 0, /* bitpos */ 667 complain_overflow_signed, /* complain_on_overflow */ 668 mmix_elf_reloc, /* special_function */ 669 "R_MMIX_ADDR27", /* name */ 670 FALSE, /* partial_inplace */ 671 ~0x1ffffff, /* src_mask */ 672 0x1ffffff, /* dst_mask */ 673 TRUE), /* pcrel_offset */ 674 675 /* A general register or the value 0..255. If a value, then the 676 instruction (offset -3) needs adjusting. */ 677 HOWTO (R_MMIX_REG_OR_BYTE, /* type */ 678 0, /* rightshift */ 679 1, /* size (0 = byte, 1 = short, 2 = long) */ 680 8, /* bitsize */ 681 FALSE, /* pc_relative */ 682 0, /* bitpos */ 683 complain_overflow_bitfield, /* complain_on_overflow */ 684 mmix_elf_reloc, /* special_function */ 685 "R_MMIX_REG_OR_BYTE", /* name */ 686 FALSE, /* partial_inplace */ 687 0, /* src_mask */ 688 0xff, /* dst_mask */ 689 FALSE), /* pcrel_offset */ 690 691 /* A general register. */ 692 HOWTO (R_MMIX_REG, /* type */ 693 0, /* rightshift */ 694 1, /* size (0 = byte, 1 = short, 2 = long) */ 695 8, /* bitsize */ 696 FALSE, /* pc_relative */ 697 0, /* bitpos */ 698 complain_overflow_bitfield, /* complain_on_overflow */ 699 mmix_elf_reloc, /* special_function */ 700 "R_MMIX_REG", /* name */ 701 FALSE, /* partial_inplace */ 702 0, /* src_mask */ 703 0xff, /* dst_mask */ 704 FALSE), /* pcrel_offset */ 705 706 /* A register plus an index, corresponding to the relocation expression. 707 The sizes must correspond to the valid range of the expression, while 708 the bitmasks correspond to what we store in the image. */ 709 HOWTO (R_MMIX_BASE_PLUS_OFFSET, /* type */ 710 0, /* rightshift */ 711 4, /* size (0 = byte, 1 = short, 2 = long) */ 712 64, /* bitsize */ 713 FALSE, /* pc_relative */ 714 0, /* bitpos */ 715 complain_overflow_bitfield, /* complain_on_overflow */ 716 mmix_elf_reloc, /* special_function */ 717 "R_MMIX_BASE_PLUS_OFFSET", /* name */ 718 FALSE, /* partial_inplace */ 719 0, /* src_mask */ 720 0xffff, /* dst_mask */ 721 FALSE), /* pcrel_offset */ 722 723 /* A "magic" relocation for a LOCAL expression, asserting that the 724 expression is less than the number of global registers. No actual 725 modification of the contents is done. Implementing this as a 726 relocation was less intrusive than e.g. putting such expressions in a 727 section to discard *after* relocation. */ 728 HOWTO (R_MMIX_LOCAL, /* type */ 729 0, /* rightshift */ 730 0, /* size (0 = byte, 1 = short, 2 = long) */ 731 0, /* bitsize */ 732 FALSE, /* pc_relative */ 733 0, /* bitpos */ 734 complain_overflow_dont, /* complain_on_overflow */ 735 mmix_elf_reloc, /* special_function */ 736 "R_MMIX_LOCAL", /* name */ 737 FALSE, /* partial_inplace */ 738 0, /* src_mask */ 739 0, /* dst_mask */ 740 FALSE), /* pcrel_offset */ 741 742 HOWTO (R_MMIX_PUSHJ_STUBBABLE, /* type */ 743 2, /* rightshift */ 744 2, /* size (0 = byte, 1 = short, 2 = long) */ 745 19, /* bitsize */ 746 TRUE, /* pc_relative */ 747 0, /* bitpos */ 748 complain_overflow_signed, /* complain_on_overflow */ 749 mmix_elf_reloc, /* special_function */ 750 "R_MMIX_PUSHJ_STUBBABLE", /* name */ 751 FALSE, /* partial_inplace */ 752 ~0x0100ffff, /* src_mask */ 753 0x0100ffff, /* dst_mask */ 754 TRUE) /* pcrel_offset */ 755 }; 756 757 758/* Map BFD reloc types to MMIX ELF reloc types. */ 759 760struct mmix_reloc_map 761 { 762 bfd_reloc_code_real_type bfd_reloc_val; 763 enum elf_mmix_reloc_type elf_reloc_val; 764 }; 765 766 767static const struct mmix_reloc_map mmix_reloc_map[] = 768 { 769 {BFD_RELOC_NONE, R_MMIX_NONE}, 770 {BFD_RELOC_8, R_MMIX_8}, 771 {BFD_RELOC_16, R_MMIX_16}, 772 {BFD_RELOC_24, R_MMIX_24}, 773 {BFD_RELOC_32, R_MMIX_32}, 774 {BFD_RELOC_64, R_MMIX_64}, 775 {BFD_RELOC_8_PCREL, R_MMIX_PC_8}, 776 {BFD_RELOC_16_PCREL, R_MMIX_PC_16}, 777 {BFD_RELOC_24_PCREL, R_MMIX_PC_24}, 778 {BFD_RELOC_32_PCREL, R_MMIX_PC_32}, 779 {BFD_RELOC_64_PCREL, R_MMIX_PC_64}, 780 {BFD_RELOC_VTABLE_INHERIT, R_MMIX_GNU_VTINHERIT}, 781 {BFD_RELOC_VTABLE_ENTRY, R_MMIX_GNU_VTENTRY}, 782 {BFD_RELOC_MMIX_GETA, R_MMIX_GETA}, 783 {BFD_RELOC_MMIX_CBRANCH, R_MMIX_CBRANCH}, 784 {BFD_RELOC_MMIX_PUSHJ, R_MMIX_PUSHJ}, 785 {BFD_RELOC_MMIX_JMP, R_MMIX_JMP}, 786 {BFD_RELOC_MMIX_ADDR19, R_MMIX_ADDR19}, 787 {BFD_RELOC_MMIX_ADDR27, R_MMIX_ADDR27}, 788 {BFD_RELOC_MMIX_REG_OR_BYTE, R_MMIX_REG_OR_BYTE}, 789 {BFD_RELOC_MMIX_REG, R_MMIX_REG}, 790 {BFD_RELOC_MMIX_BASE_PLUS_OFFSET, R_MMIX_BASE_PLUS_OFFSET}, 791 {BFD_RELOC_MMIX_LOCAL, R_MMIX_LOCAL}, 792 {BFD_RELOC_MMIX_PUSHJ_STUBBABLE, R_MMIX_PUSHJ_STUBBABLE} 793 }; 794 795static reloc_howto_type * 796bfd_elf64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 797 bfd_reloc_code_real_type code) 798{ 799 unsigned int i; 800 801 for (i = 0; 802 i < sizeof (mmix_reloc_map) / sizeof (mmix_reloc_map[0]); 803 i++) 804 { 805 if (mmix_reloc_map[i].bfd_reloc_val == code) 806 return &elf_mmix_howto_table[mmix_reloc_map[i].elf_reloc_val]; 807 } 808 809 return NULL; 810} 811 812static reloc_howto_type * 813bfd_elf64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 814 const char *r_name) 815{ 816 unsigned int i; 817 818 for (i = 0; 819 i < sizeof (elf_mmix_howto_table) / sizeof (elf_mmix_howto_table[0]); 820 i++) 821 if (elf_mmix_howto_table[i].name != NULL 822 && strcasecmp (elf_mmix_howto_table[i].name, r_name) == 0) 823 return &elf_mmix_howto_table[i]; 824 825 return NULL; 826} 827 828static bfd_boolean 829mmix_elf_new_section_hook (bfd *abfd, asection *sec) 830{ 831 if (!sec->used_by_bfd) 832 { 833 struct _mmix_elf_section_data *sdata; 834 bfd_size_type amt = sizeof (*sdata); 835 836 sdata = bfd_zalloc (abfd, amt); 837 if (sdata == NULL) 838 return FALSE; 839 sec->used_by_bfd = sdata; 840 } 841 842 return _bfd_elf_new_section_hook (abfd, sec); 843} 844 845 846/* This function performs the actual bitfiddling and sanity check for a 847 final relocation. Each relocation gets its *worst*-case expansion 848 in size when it arrives here; any reduction in size should have been 849 caught in linker relaxation earlier. When we get here, the relocation 850 looks like the smallest instruction with SWYM:s (nop:s) appended to the 851 max size. We fill in those nop:s. 852 853 R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra) 854 GETA $N,foo 855 -> 856 SETL $N,foo & 0xffff 857 INCML $N,(foo >> 16) & 0xffff 858 INCMH $N,(foo >> 32) & 0xffff 859 INCH $N,(foo >> 48) & 0xffff 860 861 R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but 862 condbranches needing relaxation might be rare enough to not be 863 worthwhile.) 864 [P]Bcc $N,foo 865 -> 866 [~P]B~cc $N,.+20 867 SETL $255,foo & ... 868 INCML ... 869 INCMH ... 870 INCH ... 871 GO $255,$255,0 872 873 R_MMIX_PUSHJ: (FIXME: Relaxation...) 874 PUSHJ $N,foo 875 -> 876 SETL $255,foo & ... 877 INCML ... 878 INCMH ... 879 INCH ... 880 PUSHGO $N,$255,0 881 882 R_MMIX_JMP: (FIXME: Relaxation...) 883 JMP foo 884 -> 885 SETL $255,foo & ... 886 INCML ... 887 INCMH ... 888 INCH ... 889 GO $255,$255,0 890 891 R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */ 892 893static bfd_reloc_status_type 894mmix_elf_perform_relocation (asection *isec, reloc_howto_type *howto, 895 void *datap, bfd_vma addr, bfd_vma value, 896 char **error_message) 897{ 898 bfd *abfd = isec->owner; 899 bfd_reloc_status_type flag = bfd_reloc_ok; 900 bfd_reloc_status_type r; 901 int offs = 0; 902 int reg = 255; 903 904 /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences. 905 We handle the differences here and the common sequence later. */ 906 switch (howto->type) 907 { 908 case R_MMIX_GETA: 909 offs = 0; 910 reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 911 912 /* We change to an absolute value. */ 913 value += addr; 914 break; 915 916 case R_MMIX_CBRANCH: 917 { 918 int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16; 919 920 /* Invert the condition and prediction bit, and set the offset 921 to five instructions ahead. 922 923 We *can* do better if we want to. If the branch is found to be 924 within limits, we could leave the branch as is; there'll just 925 be a bunch of NOP:s after it. But we shouldn't see this 926 sequence often enough that it's worth doing it. */ 927 928 bfd_put_32 (abfd, 929 (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff) 930 | (24/4)), 931 (bfd_byte *) datap); 932 933 /* Put a "GO $255,$255,0" after the common sequence. */ 934 bfd_put_32 (abfd, 935 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00, 936 (bfd_byte *) datap + 20); 937 938 /* Common sequence starts at offset 4. */ 939 offs = 4; 940 941 /* We change to an absolute value. */ 942 value += addr; 943 } 944 break; 945 946 case R_MMIX_PUSHJ_STUBBABLE: 947 /* If the address fits, we're fine. */ 948 if ((value & 3) == 0 949 /* Note rightshift 0; see R_MMIX_JMP case below. */ 950 && (r = bfd_check_overflow (complain_overflow_signed, 951 howto->bitsize, 952 0, 953 bfd_arch_bits_per_address (abfd), 954 value)) == bfd_reloc_ok) 955 goto pcrel_mmix_reloc_fits; 956 else 957 { 958 bfd_size_type size = isec->rawsize ? isec->rawsize : isec->size; 959 960 /* We have the bytes at the PUSHJ insn and need to get the 961 position for the stub. There's supposed to be room allocated 962 for the stub. */ 963 bfd_byte *stubcontents 964 = ((bfd_byte *) datap 965 - (addr - (isec->output_section->vma + isec->output_offset)) 966 + size 967 + mmix_elf_section_data (isec)->pjs.stub_offset); 968 bfd_vma stubaddr; 969 970 if (mmix_elf_section_data (isec)->pjs.n_pushj_relocs == 0) 971 { 972 /* This shouldn't happen when linking to ELF or mmo, so 973 this is an attempt to link to "binary", right? We 974 can't access the output bfd, so we can't verify that 975 assumption. We only know that the critical 976 mmix_elf_check_common_relocs has not been called, 977 which happens when the output format is different 978 from the input format (and is not mmo). */ 979 if (! mmix_elf_section_data (isec)->has_warned_pushj) 980 { 981 /* For the first such error per input section, produce 982 a verbose message. */ 983 *error_message 984 = _("invalid input relocation when producing" 985 " non-ELF, non-mmo format output." 986 "\n Please use the objcopy program to convert from" 987 " ELF or mmo," 988 "\n or assemble using" 989 " \"-no-expand\" (for gcc, \"-Wa,-no-expand\""); 990 mmix_elf_section_data (isec)->has_warned_pushj = TRUE; 991 return bfd_reloc_dangerous; 992 } 993 994 /* For subsequent errors, return this one, which is 995 rate-limited but looks a little bit different, 996 hopefully without affecting user-friendliness. */ 997 return bfd_reloc_overflow; 998 } 999 1000 /* The address doesn't fit, so redirect the PUSHJ to the 1001 location of the stub. */ 1002 r = mmix_elf_perform_relocation (isec, 1003 &elf_mmix_howto_table 1004 [R_MMIX_ADDR19], 1005 datap, 1006 addr, 1007 isec->output_section->vma 1008 + isec->output_offset 1009 + size 1010 + (mmix_elf_section_data (isec) 1011 ->pjs.stub_offset) 1012 - addr, 1013 error_message); 1014 if (r != bfd_reloc_ok) 1015 return r; 1016 1017 stubaddr 1018 = (isec->output_section->vma 1019 + isec->output_offset 1020 + size 1021 + mmix_elf_section_data (isec)->pjs.stub_offset); 1022 1023 /* We generate a simple JMP if that suffices, else the whole 5 1024 insn stub. */ 1025 if (bfd_check_overflow (complain_overflow_signed, 1026 elf_mmix_howto_table[R_MMIX_ADDR27].bitsize, 1027 0, 1028 bfd_arch_bits_per_address (abfd), 1029 addr + value - stubaddr) == bfd_reloc_ok) 1030 { 1031 bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents); 1032 r = mmix_elf_perform_relocation (isec, 1033 &elf_mmix_howto_table 1034 [R_MMIX_ADDR27], 1035 stubcontents, 1036 stubaddr, 1037 value + addr - stubaddr, 1038 error_message); 1039 mmix_elf_section_data (isec)->pjs.stub_offset += 4; 1040 1041 if (size + mmix_elf_section_data (isec)->pjs.stub_offset 1042 > isec->size) 1043 abort (); 1044 1045 return r; 1046 } 1047 else 1048 { 1049 /* Put a "GO $255,0" after the common sequence. */ 1050 bfd_put_32 (abfd, 1051 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1052 | 0xff00, (bfd_byte *) stubcontents + 16); 1053 1054 /* Prepare for the general code to set the first part of the 1055 linker stub, and */ 1056 value += addr; 1057 datap = stubcontents; 1058 mmix_elf_section_data (isec)->pjs.stub_offset 1059 += MAX_PUSHJ_STUB_SIZE; 1060 } 1061 } 1062 break; 1063 1064 case R_MMIX_PUSHJ: 1065 { 1066 int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 1067 1068 /* Put a "PUSHGO $N,$255,0" after the common sequence. */ 1069 bfd_put_32 (abfd, 1070 ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1071 | (inreg << 16) 1072 | 0xff00, 1073 (bfd_byte *) datap + 16); 1074 1075 /* We change to an absolute value. */ 1076 value += addr; 1077 } 1078 break; 1079 1080 case R_MMIX_JMP: 1081 /* This one is a little special. If we get here on a non-relaxing 1082 link, and the destination is actually in range, we don't need to 1083 execute the nops. 1084 If so, we fall through to the bit-fiddling relocs. 1085 1086 FIXME: bfd_check_overflow seems broken; the relocation is 1087 rightshifted before testing, so supply a zero rightshift. */ 1088 1089 if (! ((value & 3) == 0 1090 && (r = bfd_check_overflow (complain_overflow_signed, 1091 howto->bitsize, 1092 0, 1093 bfd_arch_bits_per_address (abfd), 1094 value)) == bfd_reloc_ok)) 1095 { 1096 /* If the relocation doesn't fit in a JMP, we let the NOP:s be 1097 modified below, and put a "GO $255,$255,0" after the 1098 address-loading sequence. */ 1099 bfd_put_32 (abfd, 1100 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1101 | 0xffff00, 1102 (bfd_byte *) datap + 16); 1103 1104 /* We change to an absolute value. */ 1105 value += addr; 1106 break; 1107 } 1108 /* FALLTHROUGH. */ 1109 case R_MMIX_ADDR19: 1110 case R_MMIX_ADDR27: 1111 pcrel_mmix_reloc_fits: 1112 /* These must be in range, or else we emit an error. */ 1113 if ((value & 3) == 0 1114 /* Note rightshift 0; see above. */ 1115 && (r = bfd_check_overflow (complain_overflow_signed, 1116 howto->bitsize, 1117 0, 1118 bfd_arch_bits_per_address (abfd), 1119 value)) == bfd_reloc_ok) 1120 { 1121 bfd_vma in1 1122 = bfd_get_32 (abfd, (bfd_byte *) datap); 1123 bfd_vma highbit; 1124 1125 if ((bfd_signed_vma) value < 0) 1126 { 1127 highbit = 1 << 24; 1128 value += (1 << (howto->bitsize - 1)); 1129 } 1130 else 1131 highbit = 0; 1132 1133 value >>= 2; 1134 1135 bfd_put_32 (abfd, 1136 (in1 & howto->src_mask) 1137 | highbit 1138 | (value & howto->dst_mask), 1139 (bfd_byte *) datap); 1140 1141 return bfd_reloc_ok; 1142 } 1143 else 1144 return bfd_reloc_overflow; 1145 1146 case R_MMIX_BASE_PLUS_OFFSET: 1147 { 1148 struct bpo_reloc_section_info *bpodata 1149 = mmix_elf_section_data (isec)->bpo.reloc; 1150 asection *bpo_greg_section; 1151 struct bpo_greg_section_info *gregdata; 1152 size_t bpo_index; 1153 1154 if (bpodata == NULL) 1155 { 1156 /* This shouldn't happen when linking to ELF or mmo, so 1157 this is an attempt to link to "binary", right? We 1158 can't access the output bfd, so we can't verify that 1159 assumption. We only know that the critical 1160 mmix_elf_check_common_relocs has not been called, which 1161 happens when the output format is different from the 1162 input format (and is not mmo). */ 1163 if (! mmix_elf_section_data (isec)->has_warned_bpo) 1164 { 1165 /* For the first such error per input section, produce 1166 a verbose message. */ 1167 *error_message 1168 = _("invalid input relocation when producing" 1169 " non-ELF, non-mmo format output." 1170 "\n Please use the objcopy program to convert from" 1171 " ELF or mmo," 1172 "\n or compile using the gcc-option" 1173 " \"-mno-base-addresses\"."); 1174 mmix_elf_section_data (isec)->has_warned_bpo = TRUE; 1175 return bfd_reloc_dangerous; 1176 } 1177 1178 /* For subsequent errors, return this one, which is 1179 rate-limited but looks a little bit different, 1180 hopefully without affecting user-friendliness. */ 1181 return bfd_reloc_overflow; 1182 } 1183 1184 bpo_greg_section = bpodata->bpo_greg_section; 1185 gregdata = mmix_elf_section_data (bpo_greg_section)->bpo.greg; 1186 bpo_index = gregdata->bpo_reloc_indexes[bpodata->bpo_index++]; 1187 1188 /* A consistency check: The value we now have in "relocation" must 1189 be the same as the value we stored for that relocation. It 1190 doesn't cost much, so can be left in at all times. */ 1191 if (value != gregdata->reloc_request[bpo_index].value) 1192 { 1193 _bfd_error_handler 1194 /* xgettext:c-format */ 1195 (_("%s: Internal inconsistency error for value for\n\ 1196 linker-allocated global register: linked: 0x%lx%08lx != relaxed: 0x%lx%08lx\n"), 1197 bfd_get_filename (isec->owner), 1198 (unsigned long) (value >> 32), (unsigned long) value, 1199 (unsigned long) (gregdata->reloc_request[bpo_index].value 1200 >> 32), 1201 (unsigned long) gregdata->reloc_request[bpo_index].value); 1202 bfd_set_error (bfd_error_bad_value); 1203 return bfd_reloc_overflow; 1204 } 1205 1206 /* Then store the register number and offset for that register 1207 into datap and datap + 1 respectively. */ 1208 bfd_put_8 (abfd, 1209 gregdata->reloc_request[bpo_index].regindex 1210 + bpo_greg_section->output_section->vma / 8, 1211 datap); 1212 bfd_put_8 (abfd, 1213 gregdata->reloc_request[bpo_index].offset, 1214 ((unsigned char *) datap) + 1); 1215 return bfd_reloc_ok; 1216 } 1217 1218 case R_MMIX_REG_OR_BYTE: 1219 case R_MMIX_REG: 1220 if (value > 255) 1221 return bfd_reloc_overflow; 1222 bfd_put_8 (abfd, value, datap); 1223 return bfd_reloc_ok; 1224 1225 default: 1226 BAD_CASE (howto->type); 1227 } 1228 1229 /* This code adds the common SETL/INCML/INCMH/INCH worst-case 1230 sequence. */ 1231 1232 /* Lowest two bits must be 0. We return bfd_reloc_overflow for 1233 everything that looks strange. */ 1234 if (value & 3) 1235 flag = bfd_reloc_overflow; 1236 1237 bfd_put_32 (abfd, 1238 (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16), 1239 (bfd_byte *) datap + offs); 1240 bfd_put_32 (abfd, 1241 (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16), 1242 (bfd_byte *) datap + offs + 4); 1243 bfd_put_32 (abfd, 1244 (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16), 1245 (bfd_byte *) datap + offs + 8); 1246 bfd_put_32 (abfd, 1247 (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16), 1248 (bfd_byte *) datap + offs + 12); 1249 1250 return flag; 1251} 1252 1253/* Set the howto pointer for an MMIX ELF reloc (type RELA). */ 1254 1255static void 1256mmix_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, 1257 arelent *cache_ptr, 1258 Elf_Internal_Rela *dst) 1259{ 1260 unsigned int r_type; 1261 1262 r_type = ELF64_R_TYPE (dst->r_info); 1263 if (r_type >= (unsigned int) R_MMIX_max) 1264 { 1265 /* xgettext:c-format */ 1266 _bfd_error_handler (_("%B: invalid MMIX reloc number: %d"), abfd, r_type); 1267 r_type = 0; 1268 } 1269 cache_ptr->howto = &elf_mmix_howto_table[r_type]; 1270} 1271 1272/* Any MMIX-specific relocation gets here at assembly time or when linking 1273 to other formats (such as mmo); this is the relocation function from 1274 the reloc_table. We don't get here for final pure ELF linking. */ 1275 1276static bfd_reloc_status_type 1277mmix_elf_reloc (bfd *abfd, 1278 arelent *reloc_entry, 1279 asymbol *symbol, 1280 void * data, 1281 asection *input_section, 1282 bfd *output_bfd, 1283 char **error_message) 1284{ 1285 bfd_vma relocation; 1286 bfd_reloc_status_type r; 1287 asection *reloc_target_output_section; 1288 bfd_reloc_status_type flag = bfd_reloc_ok; 1289 bfd_vma output_base = 0; 1290 1291 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 1292 input_section, output_bfd, error_message); 1293 1294 /* If that was all that was needed (i.e. this isn't a final link, only 1295 some segment adjustments), we're done. */ 1296 if (r != bfd_reloc_continue) 1297 return r; 1298 1299 if (bfd_is_und_section (symbol->section) 1300 && (symbol->flags & BSF_WEAK) == 0 1301 && output_bfd == (bfd *) NULL) 1302 return bfd_reloc_undefined; 1303 1304 /* Is the address of the relocation really within the section? */ 1305 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 1306 return bfd_reloc_outofrange; 1307 1308 /* Work out which section the relocation is targeted at and the 1309 initial relocation command value. */ 1310 1311 /* Get symbol value. (Common symbols are special.) */ 1312 if (bfd_is_com_section (symbol->section)) 1313 relocation = 0; 1314 else 1315 relocation = symbol->value; 1316 1317 reloc_target_output_section = bfd_get_output_section (symbol); 1318 1319 /* Here the variable relocation holds the final address of the symbol we 1320 are relocating against, plus any addend. */ 1321 if (output_bfd) 1322 output_base = 0; 1323 else 1324 output_base = reloc_target_output_section->vma; 1325 1326 relocation += output_base + symbol->section->output_offset; 1327 1328 if (output_bfd != (bfd *) NULL) 1329 { 1330 /* Add in supplied addend. */ 1331 relocation += reloc_entry->addend; 1332 1333 /* This is a partial relocation, and we want to apply the 1334 relocation to the reloc entry rather than the raw data. 1335 Modify the reloc inplace to reflect what we now know. */ 1336 reloc_entry->addend = relocation; 1337 reloc_entry->address += input_section->output_offset; 1338 return flag; 1339 } 1340 1341 return mmix_final_link_relocate (reloc_entry->howto, input_section, 1342 data, reloc_entry->address, 1343 reloc_entry->addend, relocation, 1344 bfd_asymbol_name (symbol), 1345 reloc_target_output_section, 1346 error_message); 1347} 1348 1349/* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it 1350 for guidance if you're thinking of copying this. */ 1351 1352static bfd_boolean 1353mmix_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, 1354 struct bfd_link_info *info, 1355 bfd *input_bfd, 1356 asection *input_section, 1357 bfd_byte *contents, 1358 Elf_Internal_Rela *relocs, 1359 Elf_Internal_Sym *local_syms, 1360 asection **local_sections) 1361{ 1362 Elf_Internal_Shdr *symtab_hdr; 1363 struct elf_link_hash_entry **sym_hashes; 1364 Elf_Internal_Rela *rel; 1365 Elf_Internal_Rela *relend; 1366 bfd_size_type size; 1367 size_t pjsno = 0; 1368 1369 size = input_section->rawsize ? input_section->rawsize : input_section->size; 1370 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1371 sym_hashes = elf_sym_hashes (input_bfd); 1372 relend = relocs + input_section->reloc_count; 1373 1374 /* Zero the stub area before we start. */ 1375 if (input_section->rawsize != 0 1376 && input_section->size > input_section->rawsize) 1377 memset (contents + input_section->rawsize, 0, 1378 input_section->size - input_section->rawsize); 1379 1380 for (rel = relocs; rel < relend; rel ++) 1381 { 1382 reloc_howto_type *howto; 1383 unsigned long r_symndx; 1384 Elf_Internal_Sym *sym; 1385 asection *sec; 1386 struct elf_link_hash_entry *h; 1387 bfd_vma relocation; 1388 bfd_reloc_status_type r; 1389 const char *name = NULL; 1390 int r_type; 1391 bfd_boolean undefined_signalled = FALSE; 1392 1393 r_type = ELF64_R_TYPE (rel->r_info); 1394 1395 if (r_type == R_MMIX_GNU_VTINHERIT 1396 || r_type == R_MMIX_GNU_VTENTRY) 1397 continue; 1398 1399 r_symndx = ELF64_R_SYM (rel->r_info); 1400 1401 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info); 1402 h = NULL; 1403 sym = NULL; 1404 sec = NULL; 1405 1406 if (r_symndx < symtab_hdr->sh_info) 1407 { 1408 sym = local_syms + r_symndx; 1409 sec = local_sections [r_symndx]; 1410 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1411 1412 name = bfd_elf_string_from_elf_section (input_bfd, 1413 symtab_hdr->sh_link, 1414 sym->st_name); 1415 if (name == NULL) 1416 name = bfd_section_name (input_bfd, sec); 1417 } 1418 else 1419 { 1420 bfd_boolean unresolved_reloc, ignored; 1421 1422 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1423 r_symndx, symtab_hdr, sym_hashes, 1424 h, sec, relocation, 1425 unresolved_reloc, undefined_signalled, 1426 ignored); 1427 name = h->root.root.string; 1428 } 1429 1430 if (sec != NULL && discarded_section (sec)) 1431 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1432 rel, 1, relend, howto, 0, contents); 1433 1434 if (bfd_link_relocatable (info)) 1435 { 1436 /* This is a relocatable link. For most relocs we don't have to 1437 change anything, unless the reloc is against a section 1438 symbol, in which case we have to adjust according to where 1439 the section symbol winds up in the output section. */ 1440 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 1441 rel->r_addend += sec->output_offset; 1442 1443 /* For PUSHJ stub relocs however, we may need to change the 1444 reloc and the section contents, if the reloc doesn't reach 1445 beyond the end of the output section and previous stubs. 1446 Then we change the section contents to be a PUSHJ to the end 1447 of the input section plus stubs (we can do that without using 1448 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ 1449 at the stub location. */ 1450 if (r_type == R_MMIX_PUSHJ_STUBBABLE) 1451 { 1452 /* We've already checked whether we need a stub; use that 1453 knowledge. */ 1454 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno] 1455 != 0) 1456 { 1457 Elf_Internal_Rela relcpy; 1458 1459 if (mmix_elf_section_data (input_section) 1460 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE) 1461 abort (); 1462 1463 /* There's already a PUSHJ insn there, so just fill in 1464 the offset bits to the stub. */ 1465 if (mmix_final_link_relocate (elf_mmix_howto_table 1466 + R_MMIX_ADDR19, 1467 input_section, 1468 contents, 1469 rel->r_offset, 1470 0, 1471 input_section 1472 ->output_section->vma 1473 + input_section->output_offset 1474 + size 1475 + mmix_elf_section_data (input_section) 1476 ->pjs.stub_offset, 1477 NULL, NULL, NULL) != bfd_reloc_ok) 1478 return FALSE; 1479 1480 /* Put a JMP insn at the stub; it goes with the 1481 R_MMIX_JMP reloc. */ 1482 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24, 1483 contents 1484 + size 1485 + mmix_elf_section_data (input_section) 1486 ->pjs.stub_offset); 1487 1488 /* Change the reloc to be at the stub, and to a full 1489 R_MMIX_JMP reloc. */ 1490 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP); 1491 rel->r_offset 1492 = (size 1493 + mmix_elf_section_data (input_section) 1494 ->pjs.stub_offset); 1495 1496 mmix_elf_section_data (input_section)->pjs.stub_offset 1497 += MAX_PUSHJ_STUB_SIZE; 1498 1499 /* Shift this reloc to the end of the relocs to maintain 1500 the r_offset sorted reloc order. */ 1501 relcpy = *rel; 1502 memmove (rel, rel + 1, (char *) relend - (char *) rel); 1503 relend[-1] = relcpy; 1504 1505 /* Back up one reloc, or else we'd skip the next reloc 1506 in turn. */ 1507 rel--; 1508 } 1509 1510 pjsno++; 1511 } 1512 continue; 1513 } 1514 1515 r = mmix_final_link_relocate (howto, input_section, 1516 contents, rel->r_offset, 1517 rel->r_addend, relocation, name, sec, NULL); 1518 1519 if (r != bfd_reloc_ok) 1520 { 1521 const char * msg = (const char *) NULL; 1522 1523 switch (r) 1524 { 1525 case bfd_reloc_overflow: 1526 info->callbacks->reloc_overflow 1527 (info, (h ? &h->root : NULL), name, howto->name, 1528 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1529 break; 1530 1531 case bfd_reloc_undefined: 1532 /* We may have sent this message above. */ 1533 if (! undefined_signalled) 1534 info->callbacks->undefined_symbol 1535 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 1536 undefined_signalled = TRUE; 1537 break; 1538 1539 case bfd_reloc_outofrange: 1540 msg = _("internal error: out of range error"); 1541 break; 1542 1543 case bfd_reloc_notsupported: 1544 msg = _("internal error: unsupported relocation error"); 1545 break; 1546 1547 case bfd_reloc_dangerous: 1548 msg = _("internal error: dangerous relocation"); 1549 break; 1550 1551 default: 1552 msg = _("internal error: unknown error"); 1553 break; 1554 } 1555 1556 if (msg) 1557 (*info->callbacks->warning) (info, msg, name, input_bfd, 1558 input_section, rel->r_offset); 1559 } 1560 } 1561 1562 return TRUE; 1563} 1564 1565/* Perform a single relocation. By default we use the standard BFD 1566 routines. A few relocs we have to do ourselves. */ 1567 1568static bfd_reloc_status_type 1569mmix_final_link_relocate (reloc_howto_type *howto, asection *input_section, 1570 bfd_byte *contents, bfd_vma r_offset, 1571 bfd_signed_vma r_addend, bfd_vma relocation, 1572 const char *symname, asection *symsec, 1573 char **error_message) 1574{ 1575 bfd_reloc_status_type r = bfd_reloc_ok; 1576 bfd_vma addr 1577 = (input_section->output_section->vma 1578 + input_section->output_offset 1579 + r_offset); 1580 bfd_signed_vma srel 1581 = (bfd_signed_vma) relocation + r_addend; 1582 1583 switch (howto->type) 1584 { 1585 /* All these are PC-relative. */ 1586 case R_MMIX_PUSHJ_STUBBABLE: 1587 case R_MMIX_PUSHJ: 1588 case R_MMIX_CBRANCH: 1589 case R_MMIX_ADDR19: 1590 case R_MMIX_GETA: 1591 case R_MMIX_ADDR27: 1592 case R_MMIX_JMP: 1593 contents += r_offset; 1594 1595 srel -= (input_section->output_section->vma 1596 + input_section->output_offset 1597 + r_offset); 1598 1599 r = mmix_elf_perform_relocation (input_section, howto, contents, 1600 addr, srel, error_message); 1601 break; 1602 1603 case R_MMIX_BASE_PLUS_OFFSET: 1604 if (symsec == NULL) 1605 return bfd_reloc_undefined; 1606 1607 /* Check that we're not relocating against a register symbol. */ 1608 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1609 MMIX_REG_CONTENTS_SECTION_NAME) == 0 1610 || strcmp (bfd_get_section_name (symsec->owner, symsec), 1611 MMIX_REG_SECTION_NAME) == 0) 1612 { 1613 /* Note: This is separated out into two messages in order 1614 to ease the translation into other languages. */ 1615 if (symname == NULL || *symname == 0) 1616 _bfd_error_handler 1617 /* xgettext:c-format */ 1618 (_("%s: base-plus-offset relocation against register symbol: (unknown) in %s"), 1619 bfd_get_filename (input_section->owner), 1620 bfd_get_section_name (symsec->owner, symsec)); 1621 else 1622 _bfd_error_handler 1623 /* xgettext:c-format */ 1624 (_("%s: base-plus-offset relocation against register symbol: %s in %s"), 1625 bfd_get_filename (input_section->owner), symname, 1626 bfd_get_section_name (symsec->owner, symsec)); 1627 return bfd_reloc_overflow; 1628 } 1629 goto do_mmix_reloc; 1630 1631 case R_MMIX_REG_OR_BYTE: 1632 case R_MMIX_REG: 1633 /* For now, we handle these alike. They must refer to an register 1634 symbol, which is either relative to the register section and in 1635 the range 0..255, or is in the register contents section with vma 1636 regno * 8. */ 1637 1638 /* FIXME: A better way to check for reg contents section? 1639 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */ 1640 if (symsec == NULL) 1641 return bfd_reloc_undefined; 1642 1643 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1644 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1645 { 1646 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1647 { 1648 /* The bfd_reloc_outofrange return value, though intuitively 1649 a better value, will not get us an error. */ 1650 return bfd_reloc_overflow; 1651 } 1652 srel /= 8; 1653 } 1654 else if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1655 MMIX_REG_SECTION_NAME) == 0) 1656 { 1657 if (srel < 0 || srel > 255) 1658 /* The bfd_reloc_outofrange return value, though intuitively a 1659 better value, will not get us an error. */ 1660 return bfd_reloc_overflow; 1661 } 1662 else 1663 { 1664 /* Note: This is separated out into two messages in order 1665 to ease the translation into other languages. */ 1666 if (symname == NULL || *symname == 0) 1667 _bfd_error_handler 1668 /* xgettext:c-format */ 1669 (_("%s: register relocation against non-register symbol: (unknown) in %s"), 1670 bfd_get_filename (input_section->owner), 1671 bfd_get_section_name (symsec->owner, symsec)); 1672 else 1673 _bfd_error_handler 1674 /* xgettext:c-format */ 1675 (_("%s: register relocation against non-register symbol: %s in %s"), 1676 bfd_get_filename (input_section->owner), symname, 1677 bfd_get_section_name (symsec->owner, symsec)); 1678 1679 /* The bfd_reloc_outofrange return value, though intuitively a 1680 better value, will not get us an error. */ 1681 return bfd_reloc_overflow; 1682 } 1683 do_mmix_reloc: 1684 contents += r_offset; 1685 r = mmix_elf_perform_relocation (input_section, howto, contents, 1686 addr, srel, error_message); 1687 break; 1688 1689 case R_MMIX_LOCAL: 1690 /* This isn't a real relocation, it's just an assertion that the 1691 final relocation value corresponds to a local register. We 1692 ignore the actual relocation; nothing is changed. */ 1693 { 1694 asection *regsec 1695 = bfd_get_section_by_name (input_section->output_section->owner, 1696 MMIX_REG_CONTENTS_SECTION_NAME); 1697 bfd_vma first_global; 1698 1699 /* Check that this is an absolute value, or a reference to the 1700 register contents section or the register (symbol) section. 1701 Absolute numbers can get here as undefined section. Undefined 1702 symbols are signalled elsewhere, so there's no conflict in us 1703 accidentally handling it. */ 1704 if (!bfd_is_abs_section (symsec) 1705 && !bfd_is_und_section (symsec) 1706 && strcmp (bfd_get_section_name (symsec->owner, symsec), 1707 MMIX_REG_CONTENTS_SECTION_NAME) != 0 1708 && strcmp (bfd_get_section_name (symsec->owner, symsec), 1709 MMIX_REG_SECTION_NAME) != 0) 1710 { 1711 _bfd_error_handler 1712 (_("%s: directive LOCAL valid only with a register or absolute value"), 1713 bfd_get_filename (input_section->owner)); 1714 1715 return bfd_reloc_overflow; 1716 } 1717 1718 /* If we don't have a register contents section, then $255 is the 1719 first global register. */ 1720 if (regsec == NULL) 1721 first_global = 255; 1722 else 1723 { 1724 first_global 1725 = bfd_get_section_vma (input_section->output_section->owner, 1726 regsec) / 8; 1727 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1728 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1729 { 1730 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1731 /* The bfd_reloc_outofrange return value, though 1732 intuitively a better value, will not get us an error. */ 1733 return bfd_reloc_overflow; 1734 srel /= 8; 1735 } 1736 } 1737 1738 if ((bfd_vma) srel >= first_global) 1739 { 1740 /* FIXME: Better error message. */ 1741 _bfd_error_handler 1742 /* xgettext:c-format */ 1743 (_("%s: LOCAL directive: Register $%ld is not a local register. First global register is $%ld."), 1744 bfd_get_filename (input_section->owner), (long) srel, (long) first_global); 1745 1746 return bfd_reloc_overflow; 1747 } 1748 } 1749 r = bfd_reloc_ok; 1750 break; 1751 1752 default: 1753 r = _bfd_final_link_relocate (howto, input_section->owner, input_section, 1754 contents, r_offset, 1755 relocation, r_addend); 1756 } 1757 1758 return r; 1759} 1760 1761/* Return the section that should be marked against GC for a given 1762 relocation. */ 1763 1764static asection * 1765mmix_elf_gc_mark_hook (asection *sec, 1766 struct bfd_link_info *info, 1767 Elf_Internal_Rela *rel, 1768 struct elf_link_hash_entry *h, 1769 Elf_Internal_Sym *sym) 1770{ 1771 if (h != NULL) 1772 switch (ELF64_R_TYPE (rel->r_info)) 1773 { 1774 case R_MMIX_GNU_VTINHERIT: 1775 case R_MMIX_GNU_VTENTRY: 1776 return NULL; 1777 } 1778 1779 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1780} 1781 1782/* Update relocation info for a GC-excluded section. We could supposedly 1783 perform the allocation after GC, but there's no suitable hook between 1784 GC (or section merge) and the point when all input sections must be 1785 present. Better to waste some memory and (perhaps) a little time. */ 1786 1787static bfd_boolean 1788mmix_elf_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, 1789 struct bfd_link_info *info ATTRIBUTE_UNUSED, 1790 asection *sec, 1791 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) 1792{ 1793 struct bpo_reloc_section_info *bpodata 1794 = mmix_elf_section_data (sec)->bpo.reloc; 1795 asection *allocated_gregs_section; 1796 1797 /* If no bpodata here, we have nothing to do. */ 1798 if (bpodata == NULL) 1799 return TRUE; 1800 1801 allocated_gregs_section = bpodata->bpo_greg_section; 1802 1803 mmix_elf_section_data (allocated_gregs_section)->bpo.greg->n_bpo_relocs 1804 -= bpodata->n_bpo_relocs_this_section; 1805 1806 return TRUE; 1807} 1808 1809/* Sort register relocs to come before expanding relocs. */ 1810 1811static int 1812mmix_elf_sort_relocs (const void * p1, const void * p2) 1813{ 1814 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1; 1815 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2; 1816 int r1_is_reg, r2_is_reg; 1817 1818 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive 1819 insns. */ 1820 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3)) 1821 return 1; 1822 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3)) 1823 return -1; 1824 1825 r1_is_reg 1826 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE 1827 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG); 1828 r2_is_reg 1829 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE 1830 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG); 1831 if (r1_is_reg != r2_is_reg) 1832 return r2_is_reg - r1_is_reg; 1833 1834 /* Neither or both are register relocs. Then sort on full offset. */ 1835 if (r1->r_offset > r2->r_offset) 1836 return 1; 1837 else if (r1->r_offset < r2->r_offset) 1838 return -1; 1839 return 0; 1840} 1841 1842/* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */ 1843 1844static bfd_boolean 1845mmix_elf_check_common_relocs (bfd *abfd, 1846 struct bfd_link_info *info, 1847 asection *sec, 1848 const Elf_Internal_Rela *relocs) 1849{ 1850 bfd *bpo_greg_owner = NULL; 1851 asection *allocated_gregs_section = NULL; 1852 struct bpo_greg_section_info *gregdata = NULL; 1853 struct bpo_reloc_section_info *bpodata = NULL; 1854 const Elf_Internal_Rela *rel; 1855 const Elf_Internal_Rela *rel_end; 1856 1857 /* We currently have to abuse this COFF-specific member, since there's 1858 no target-machine-dedicated member. There's no alternative outside 1859 the bfd_link_info struct; we can't specialize a hash-table since 1860 they're different between ELF and mmo. */ 1861 bpo_greg_owner = (bfd *) info->base_file; 1862 1863 rel_end = relocs + sec->reloc_count; 1864 for (rel = relocs; rel < rel_end; rel++) 1865 { 1866 switch (ELF64_R_TYPE (rel->r_info)) 1867 { 1868 /* This relocation causes a GREG allocation. We need to count 1869 them, and we need to create a section for them, so we need an 1870 object to fake as the owner of that section. We can't use 1871 the ELF dynobj for this, since the ELF bits assume lots of 1872 DSO-related stuff if that member is non-NULL. */ 1873 case R_MMIX_BASE_PLUS_OFFSET: 1874 /* We don't do anything with this reloc for a relocatable link. */ 1875 if (bfd_link_relocatable (info)) 1876 break; 1877 1878 if (bpo_greg_owner == NULL) 1879 { 1880 bpo_greg_owner = abfd; 1881 info->base_file = bpo_greg_owner; 1882 } 1883 1884 if (allocated_gregs_section == NULL) 1885 allocated_gregs_section 1886 = bfd_get_section_by_name (bpo_greg_owner, 1887 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 1888 1889 if (allocated_gregs_section == NULL) 1890 { 1891 allocated_gregs_section 1892 = bfd_make_section_with_flags (bpo_greg_owner, 1893 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME, 1894 (SEC_HAS_CONTENTS 1895 | SEC_IN_MEMORY 1896 | SEC_LINKER_CREATED)); 1897 /* Setting both SEC_ALLOC and SEC_LOAD means the section is 1898 treated like any other section, and we'd get errors for 1899 address overlap with the text section. Let's set none of 1900 those flags, as that is what currently happens for usual 1901 GREG allocations, and that works. */ 1902 if (allocated_gregs_section == NULL 1903 || !bfd_set_section_alignment (bpo_greg_owner, 1904 allocated_gregs_section, 1905 3)) 1906 return FALSE; 1907 1908 gregdata = (struct bpo_greg_section_info *) 1909 bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info)); 1910 if (gregdata == NULL) 1911 return FALSE; 1912 mmix_elf_section_data (allocated_gregs_section)->bpo.greg 1913 = gregdata; 1914 } 1915 else if (gregdata == NULL) 1916 gregdata 1917 = mmix_elf_section_data (allocated_gregs_section)->bpo.greg; 1918 1919 /* Get ourselves some auxiliary info for the BPO-relocs. */ 1920 if (bpodata == NULL) 1921 { 1922 /* No use doing a separate iteration pass to find the upper 1923 limit - just use the number of relocs. */ 1924 bpodata = (struct bpo_reloc_section_info *) 1925 bfd_alloc (bpo_greg_owner, 1926 sizeof (struct bpo_reloc_section_info) 1927 * (sec->reloc_count + 1)); 1928 if (bpodata == NULL) 1929 return FALSE; 1930 mmix_elf_section_data (sec)->bpo.reloc = bpodata; 1931 bpodata->first_base_plus_offset_reloc 1932 = bpodata->bpo_index 1933 = gregdata->n_max_bpo_relocs; 1934 bpodata->bpo_greg_section 1935 = allocated_gregs_section; 1936 bpodata->n_bpo_relocs_this_section = 0; 1937 } 1938 1939 bpodata->n_bpo_relocs_this_section++; 1940 gregdata->n_max_bpo_relocs++; 1941 1942 /* We don't get another chance to set this before GC; we've not 1943 set up any hook that runs before GC. */ 1944 gregdata->n_bpo_relocs 1945 = gregdata->n_max_bpo_relocs; 1946 break; 1947 1948 case R_MMIX_PUSHJ_STUBBABLE: 1949 mmix_elf_section_data (sec)->pjs.n_pushj_relocs++; 1950 break; 1951 } 1952 } 1953 1954 /* Allocate per-reloc stub storage and initialize it to the max stub 1955 size. */ 1956 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0) 1957 { 1958 size_t i; 1959 1960 mmix_elf_section_data (sec)->pjs.stub_size 1961 = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs 1962 * sizeof (mmix_elf_section_data (sec) 1963 ->pjs.stub_size[0])); 1964 if (mmix_elf_section_data (sec)->pjs.stub_size == NULL) 1965 return FALSE; 1966 1967 for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++) 1968 mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE; 1969 } 1970 1971 return TRUE; 1972} 1973 1974/* Look through the relocs for a section during the first phase. */ 1975 1976static bfd_boolean 1977mmix_elf_check_relocs (bfd *abfd, 1978 struct bfd_link_info *info, 1979 asection *sec, 1980 const Elf_Internal_Rela *relocs) 1981{ 1982 Elf_Internal_Shdr *symtab_hdr; 1983 struct elf_link_hash_entry **sym_hashes; 1984 const Elf_Internal_Rela *rel; 1985 const Elf_Internal_Rela *rel_end; 1986 1987 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1988 sym_hashes = elf_sym_hashes (abfd); 1989 1990 /* First we sort the relocs so that any register relocs come before 1991 expansion-relocs to the same insn. FIXME: Not done for mmo. */ 1992 qsort ((void *) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), 1993 mmix_elf_sort_relocs); 1994 1995 /* Do the common part. */ 1996 if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs)) 1997 return FALSE; 1998 1999 if (bfd_link_relocatable (info)) 2000 return TRUE; 2001 2002 rel_end = relocs + sec->reloc_count; 2003 for (rel = relocs; rel < rel_end; rel++) 2004 { 2005 struct elf_link_hash_entry *h; 2006 unsigned long r_symndx; 2007 2008 r_symndx = ELF64_R_SYM (rel->r_info); 2009 if (r_symndx < symtab_hdr->sh_info) 2010 h = NULL; 2011 else 2012 { 2013 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2014 while (h->root.type == bfd_link_hash_indirect 2015 || h->root.type == bfd_link_hash_warning) 2016 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2017 2018 /* PR15323, ref flags aren't set for references in the same 2019 object. */ 2020 h->root.non_ir_ref = 1; 2021 } 2022 2023 switch (ELF64_R_TYPE (rel->r_info)) 2024 { 2025 /* This relocation describes the C++ object vtable hierarchy. 2026 Reconstruct it for later use during GC. */ 2027 case R_MMIX_GNU_VTINHERIT: 2028 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2029 return FALSE; 2030 break; 2031 2032 /* This relocation describes which C++ vtable entries are actually 2033 used. Record for later use during GC. */ 2034 case R_MMIX_GNU_VTENTRY: 2035 BFD_ASSERT (h != NULL); 2036 if (h != NULL 2037 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2038 return FALSE; 2039 break; 2040 } 2041 } 2042 2043 return TRUE; 2044} 2045 2046/* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo. 2047 Copied from elf_link_add_object_symbols. */ 2048 2049bfd_boolean 2050_bfd_mmix_check_all_relocs (bfd *abfd, struct bfd_link_info *info) 2051{ 2052 asection *o; 2053 2054 for (o = abfd->sections; o != NULL; o = o->next) 2055 { 2056 Elf_Internal_Rela *internal_relocs; 2057 bfd_boolean ok; 2058 2059 if ((o->flags & SEC_RELOC) == 0 2060 || o->reloc_count == 0 2061 || ((info->strip == strip_all || info->strip == strip_debugger) 2062 && (o->flags & SEC_DEBUGGING) != 0) 2063 || bfd_is_abs_section (o->output_section)) 2064 continue; 2065 2066 internal_relocs 2067 = _bfd_elf_link_read_relocs (abfd, o, NULL, 2068 (Elf_Internal_Rela *) NULL, 2069 info->keep_memory); 2070 if (internal_relocs == NULL) 2071 return FALSE; 2072 2073 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs); 2074 2075 if (! info->keep_memory) 2076 free (internal_relocs); 2077 2078 if (! ok) 2079 return FALSE; 2080 } 2081 2082 return TRUE; 2083} 2084 2085/* Change symbols relative to the reg contents section to instead be to 2086 the register section, and scale them down to correspond to the register 2087 number. */ 2088 2089static int 2090mmix_elf_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED, 2091 const char *name ATTRIBUTE_UNUSED, 2092 Elf_Internal_Sym *sym, 2093 asection *input_sec, 2094 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) 2095{ 2096 if (input_sec != NULL 2097 && input_sec->name != NULL 2098 && ELF_ST_TYPE (sym->st_info) != STT_SECTION 2099 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0) 2100 { 2101 sym->st_value /= 8; 2102 sym->st_shndx = SHN_REGISTER; 2103 } 2104 2105 return 1; 2106} 2107 2108/* We fake a register section that holds values that are register numbers. 2109 Having a SHN_REGISTER and register section translates better to other 2110 formats (e.g. mmo) than for example a STT_REGISTER attribute. 2111 This section faking is based on a construct in elf32-mips.c. */ 2112static asection mmix_elf_reg_section; 2113static asymbol mmix_elf_reg_section_symbol; 2114static asymbol *mmix_elf_reg_section_symbol_ptr; 2115 2116/* Handle the special section numbers that a symbol may use. */ 2117 2118void 2119mmix_elf_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, asymbol *asym) 2120{ 2121 elf_symbol_type *elfsym; 2122 2123 elfsym = (elf_symbol_type *) asym; 2124 switch (elfsym->internal_elf_sym.st_shndx) 2125 { 2126 case SHN_REGISTER: 2127 if (mmix_elf_reg_section.name == NULL) 2128 { 2129 /* Initialize the register section. */ 2130 mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME; 2131 mmix_elf_reg_section.flags = SEC_NO_FLAGS; 2132 mmix_elf_reg_section.output_section = &mmix_elf_reg_section; 2133 mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol; 2134 mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr; 2135 mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME; 2136 mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM; 2137 mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section; 2138 mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol; 2139 } 2140 asym->section = &mmix_elf_reg_section; 2141 break; 2142 2143 default: 2144 break; 2145 } 2146} 2147 2148/* Given a BFD section, try to locate the corresponding ELF section 2149 index. */ 2150 2151static bfd_boolean 2152mmix_elf_section_from_bfd_section (bfd * abfd ATTRIBUTE_UNUSED, 2153 asection * sec, 2154 int * retval) 2155{ 2156 if (strcmp (bfd_get_section_name (abfd, sec), MMIX_REG_SECTION_NAME) == 0) 2157 *retval = SHN_REGISTER; 2158 else 2159 return FALSE; 2160 2161 return TRUE; 2162} 2163 2164/* Hook called by the linker routine which adds symbols from an object 2165 file. We must handle the special SHN_REGISTER section number here. 2166 2167 We also check that we only have *one* each of the section-start 2168 symbols, since otherwise having two with the same value would cause 2169 them to be "merged", but with the contents serialized. */ 2170 2171static bfd_boolean 2172mmix_elf_add_symbol_hook (bfd *abfd, 2173 struct bfd_link_info *info ATTRIBUTE_UNUSED, 2174 Elf_Internal_Sym *sym, 2175 const char **namep ATTRIBUTE_UNUSED, 2176 flagword *flagsp ATTRIBUTE_UNUSED, 2177 asection **secp, 2178 bfd_vma *valp ATTRIBUTE_UNUSED) 2179{ 2180 if (sym->st_shndx == SHN_REGISTER) 2181 { 2182 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME); 2183 (*secp)->flags |= SEC_LINKER_CREATED; 2184 } 2185 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.' 2186 && CONST_STRNEQ (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) 2187 { 2188 /* See if we have another one. */ 2189 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash, 2190 *namep, 2191 FALSE, 2192 FALSE, 2193 FALSE); 2194 2195 if (h != NULL && h->type != bfd_link_hash_undefined) 2196 { 2197 /* How do we get the asymbol (or really: the filename) from h? 2198 h->u.def.section->owner is NULL. */ 2199 _bfd_error_handler 2200 /* xgettext:c-format */ 2201 (_("%s: Error: multiple definition of `%s'; start of %s " 2202 "is set in a earlier linked file\n"), 2203 bfd_get_filename (abfd), *namep, 2204 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)); 2205 bfd_set_error (bfd_error_bad_value); 2206 return FALSE; 2207 } 2208 } 2209 2210 return TRUE; 2211} 2212 2213/* We consider symbols matching "L.*:[0-9]+" to be local symbols. */ 2214 2215static bfd_boolean 2216mmix_elf_is_local_label_name (bfd *abfd, const char *name) 2217{ 2218 const char *colpos; 2219 int digits; 2220 2221 /* Also include the default local-label definition. */ 2222 if (_bfd_elf_is_local_label_name (abfd, name)) 2223 return TRUE; 2224 2225 if (*name != 'L') 2226 return FALSE; 2227 2228 /* If there's no ":", or more than one, it's not a local symbol. */ 2229 colpos = strchr (name, ':'); 2230 if (colpos == NULL || strchr (colpos + 1, ':') != NULL) 2231 return FALSE; 2232 2233 /* Check that there are remaining characters and that they are digits. */ 2234 if (colpos[1] == 0) 2235 return FALSE; 2236 2237 digits = strspn (colpos + 1, "0123456789"); 2238 return digits != 0 && colpos[1 + digits] == 0; 2239} 2240 2241/* We get rid of the register section here. */ 2242 2243bfd_boolean 2244mmix_elf_final_link (bfd *abfd, struct bfd_link_info *info) 2245{ 2246 /* We never output a register section, though we create one for 2247 temporary measures. Check that nobody entered contents into it. */ 2248 asection *reg_section; 2249 2250 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME); 2251 2252 if (reg_section != NULL) 2253 { 2254 /* FIXME: Pass error state gracefully. */ 2255 if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS) 2256 _bfd_abort (__FILE__, __LINE__, _("Register section has contents\n")); 2257 2258 /* Really remove the section, if it hasn't already been done. */ 2259 if (!bfd_section_removed_from_list (abfd, reg_section)) 2260 { 2261 bfd_section_list_remove (abfd, reg_section); 2262 --abfd->section_count; 2263 } 2264 } 2265 2266 if (! bfd_elf_final_link (abfd, info)) 2267 return FALSE; 2268 2269 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by 2270 the regular linker machinery. We do it here, like other targets with 2271 special sections. */ 2272 if (info->base_file != NULL) 2273 { 2274 asection *greg_section 2275 = bfd_get_section_by_name ((bfd *) info->base_file, 2276 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2277 if (!bfd_set_section_contents (abfd, 2278 greg_section->output_section, 2279 greg_section->contents, 2280 (file_ptr) greg_section->output_offset, 2281 greg_section->size)) 2282 return FALSE; 2283 } 2284 return TRUE; 2285} 2286 2287/* We need to include the maximum size of PUSHJ-stubs in the initial 2288 section size. This is expected to shrink during linker relaxation. */ 2289 2290static void 2291mmix_set_relaxable_size (bfd *abfd ATTRIBUTE_UNUSED, 2292 asection *sec, 2293 void *ptr) 2294{ 2295 struct bfd_link_info *info = ptr; 2296 2297 /* Make sure we only do this for section where we know we want this, 2298 otherwise we might end up resetting the size of COMMONs. */ 2299 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0) 2300 return; 2301 2302 sec->rawsize = sec->size; 2303 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2304 * MAX_PUSHJ_STUB_SIZE); 2305 2306 /* For use in relocatable link, we start with a max stubs size. See 2307 mmix_elf_relax_section. */ 2308 if (bfd_link_relocatable (info) && sec->output_section) 2309 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum 2310 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2311 * MAX_PUSHJ_STUB_SIZE); 2312} 2313 2314/* Initialize stuff for the linker-generated GREGs to match 2315 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */ 2316 2317bfd_boolean 2318_bfd_mmix_before_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2319 struct bfd_link_info *info) 2320{ 2321 asection *bpo_gregs_section; 2322 bfd *bpo_greg_owner; 2323 struct bpo_greg_section_info *gregdata; 2324 size_t n_gregs; 2325 bfd_vma gregs_size; 2326 size_t i; 2327 size_t *bpo_reloc_indexes; 2328 bfd *ibfd; 2329 2330 /* Set the initial size of sections. */ 2331 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 2332 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info); 2333 2334 /* The bpo_greg_owner bfd is supposed to have been set by 2335 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen. 2336 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2337 bpo_greg_owner = (bfd *) info->base_file; 2338 if (bpo_greg_owner == NULL) 2339 return TRUE; 2340 2341 bpo_gregs_section 2342 = bfd_get_section_by_name (bpo_greg_owner, 2343 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2344 2345 if (bpo_gregs_section == NULL) 2346 return TRUE; 2347 2348 /* We use the target-data handle in the ELF section data. */ 2349 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2350 if (gregdata == NULL) 2351 return FALSE; 2352 2353 n_gregs = gregdata->n_bpo_relocs; 2354 gregdata->n_allocated_bpo_gregs = n_gregs; 2355 2356 /* When this reaches zero during relaxation, all entries have been 2357 filled in and the size of the linker gregs can be calculated. */ 2358 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs; 2359 2360 /* Set the zeroth-order estimate for the GREGs size. */ 2361 gregs_size = n_gregs * 8; 2362 2363 if (!bfd_set_section_size (bpo_greg_owner, bpo_gregs_section, gregs_size)) 2364 return FALSE; 2365 2366 /* Allocate and set up the GREG arrays. They're filled in at relaxation 2367 time. Note that we must use the max number ever noted for the array, 2368 since the index numbers were created before GC. */ 2369 gregdata->reloc_request 2370 = bfd_zalloc (bpo_greg_owner, 2371 sizeof (struct bpo_reloc_request) 2372 * gregdata->n_max_bpo_relocs); 2373 2374 gregdata->bpo_reloc_indexes 2375 = bpo_reloc_indexes 2376 = bfd_alloc (bpo_greg_owner, 2377 gregdata->n_max_bpo_relocs 2378 * sizeof (size_t)); 2379 if (bpo_reloc_indexes == NULL) 2380 return FALSE; 2381 2382 /* The default order is an identity mapping. */ 2383 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2384 { 2385 bpo_reloc_indexes[i] = i; 2386 gregdata->reloc_request[i].bpo_reloc_no = i; 2387 } 2388 2389 return TRUE; 2390} 2391 2392/* Fill in contents in the linker allocated gregs. Everything is 2393 calculated at this point; we just move the contents into place here. */ 2394 2395bfd_boolean 2396_bfd_mmix_after_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2397 struct bfd_link_info *link_info) 2398{ 2399 asection *bpo_gregs_section; 2400 bfd *bpo_greg_owner; 2401 struct bpo_greg_section_info *gregdata; 2402 size_t n_gregs; 2403 size_t i, j; 2404 size_t lastreg; 2405 bfd_byte *contents; 2406 2407 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs 2408 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such 2409 object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2410 bpo_greg_owner = (bfd *) link_info->base_file; 2411 if (bpo_greg_owner == NULL) 2412 return TRUE; 2413 2414 bpo_gregs_section 2415 = bfd_get_section_by_name (bpo_greg_owner, 2416 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2417 2418 /* This can't happen without DSO handling. When DSOs are handled 2419 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such 2420 section. */ 2421 if (bpo_gregs_section == NULL) 2422 return TRUE; 2423 2424 /* We use the target-data handle in the ELF section data. */ 2425 2426 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2427 if (gregdata == NULL) 2428 return FALSE; 2429 2430 n_gregs = gregdata->n_allocated_bpo_gregs; 2431 2432 bpo_gregs_section->contents 2433 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size); 2434 if (contents == NULL) 2435 return FALSE; 2436 2437 /* Sanity check: If these numbers mismatch, some relocation has not been 2438 accounted for and the rest of gregdata is probably inconsistent. 2439 It's a bug, but it's more helpful to identify it than segfaulting 2440 below. */ 2441 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round 2442 != gregdata->n_bpo_relocs) 2443 { 2444 _bfd_error_handler 2445 /* xgettext:c-format */ 2446 (_("Internal inconsistency: remaining %u != max %u.\n\ 2447 Please report this bug."), 2448 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2449 gregdata->n_bpo_relocs); 2450 return FALSE; 2451 } 2452 2453 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++) 2454 if (gregdata->reloc_request[i].regindex != lastreg) 2455 { 2456 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value, 2457 contents + j * 8); 2458 lastreg = gregdata->reloc_request[i].regindex; 2459 j++; 2460 } 2461 2462 return TRUE; 2463} 2464 2465/* Sort valid relocs to come before non-valid relocs, then on increasing 2466 value. */ 2467 2468static int 2469bpo_reloc_request_sort_fn (const void * p1, const void * p2) 2470{ 2471 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1; 2472 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2; 2473 2474 /* Primary function is validity; non-valid relocs sorted after valid 2475 ones. */ 2476 if (r1->valid != r2->valid) 2477 return r2->valid - r1->valid; 2478 2479 /* Then sort on value. Don't simplify and return just the difference of 2480 the values: the upper bits of the 64-bit value would be truncated on 2481 a host with 32-bit ints. */ 2482 if (r1->value != r2->value) 2483 return r1->value > r2->value ? 1 : -1; 2484 2485 /* As a last re-sort, use the relocation number, so we get a stable 2486 sort. The *addresses* aren't stable since items are swapped during 2487 sorting. It depends on the qsort implementation if this actually 2488 happens. */ 2489 return r1->bpo_reloc_no > r2->bpo_reloc_no 2490 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0); 2491} 2492 2493/* For debug use only. Dumps the global register allocations resulting 2494 from base-plus-offset relocs. */ 2495 2496void 2497mmix_dump_bpo_gregs (struct bfd_link_info *link_info, 2498 void (*pf) (const char *fmt, ...)) 2499{ 2500 bfd *bpo_greg_owner; 2501 asection *bpo_gregs_section; 2502 struct bpo_greg_section_info *gregdata; 2503 unsigned int i; 2504 2505 if (link_info == NULL || link_info->base_file == NULL) 2506 return; 2507 2508 bpo_greg_owner = (bfd *) link_info->base_file; 2509 2510 bpo_gregs_section 2511 = bfd_get_section_by_name (bpo_greg_owner, 2512 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2513 2514 if (bpo_gregs_section == NULL) 2515 return; 2516 2517 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2518 if (gregdata == NULL) 2519 return; 2520 2521 if (pf == NULL) 2522 pf = _bfd_error_handler; 2523 2524 /* These format strings are not translated. They are for debug purposes 2525 only and never displayed to an end user. Should they escape, we 2526 surely want them in original. */ 2527 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\ 2528 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs, 2529 gregdata->n_max_bpo_relocs, 2530 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2531 gregdata->n_allocated_bpo_gregs); 2532 2533 if (gregdata->reloc_request) 2534 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2535 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n", 2536 i, 2537 (gregdata->bpo_reloc_indexes != NULL 2538 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1), 2539 gregdata->reloc_request[i].bpo_reloc_no, 2540 gregdata->reloc_request[i].valid, 2541 2542 (unsigned long) (gregdata->reloc_request[i].value >> 32), 2543 (unsigned long) gregdata->reloc_request[i].value, 2544 gregdata->reloc_request[i].regindex, 2545 gregdata->reloc_request[i].offset); 2546} 2547 2548/* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and 2549 when the last such reloc is done, an index-array is sorted according to 2550 the values and iterated over to produce register numbers (indexed by 0 2551 from the first allocated register number) and offsets for use in real 2552 relocation. (N.B.: Relocatable runs are handled, not just punted.) 2553 2554 PUSHJ stub accounting is also done here. 2555 2556 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 2557 2558static bfd_boolean 2559mmix_elf_relax_section (bfd *abfd, 2560 asection *sec, 2561 struct bfd_link_info *link_info, 2562 bfd_boolean *again) 2563{ 2564 Elf_Internal_Shdr *symtab_hdr; 2565 Elf_Internal_Rela *internal_relocs; 2566 Elf_Internal_Rela *irel, *irelend; 2567 asection *bpo_gregs_section = NULL; 2568 struct bpo_greg_section_info *gregdata; 2569 struct bpo_reloc_section_info *bpodata 2570 = mmix_elf_section_data (sec)->bpo.reloc; 2571 /* The initialization is to quiet compiler warnings. The value is to 2572 spot a missing actual initialization. */ 2573 size_t bpono = (size_t) -1; 2574 size_t pjsno = 0; 2575 Elf_Internal_Sym *isymbuf = NULL; 2576 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size; 2577 2578 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0; 2579 2580 /* Assume nothing changes. */ 2581 *again = FALSE; 2582 2583 /* We don't have to do anything if this section does not have relocs, or 2584 if this is not a code section. */ 2585 if ((sec->flags & SEC_RELOC) == 0 2586 || sec->reloc_count == 0 2587 || (sec->flags & SEC_CODE) == 0 2588 || (sec->flags & SEC_LINKER_CREATED) != 0 2589 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs, 2590 then nothing to do. */ 2591 || (bpodata == NULL 2592 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)) 2593 return TRUE; 2594 2595 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2596 2597 if (bpodata != NULL) 2598 { 2599 bpo_gregs_section = bpodata->bpo_greg_section; 2600 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2601 bpono = bpodata->first_base_plus_offset_reloc; 2602 } 2603 else 2604 gregdata = NULL; 2605 2606 /* Get a copy of the native relocations. */ 2607 internal_relocs 2608 = _bfd_elf_link_read_relocs (abfd, sec, NULL, 2609 (Elf_Internal_Rela *) NULL, 2610 link_info->keep_memory); 2611 if (internal_relocs == NULL) 2612 goto error_return; 2613 2614 /* Walk through them looking for relaxing opportunities. */ 2615 irelend = internal_relocs + sec->reloc_count; 2616 for (irel = internal_relocs; irel < irelend; irel++) 2617 { 2618 bfd_vma symval; 2619 struct elf_link_hash_entry *h = NULL; 2620 2621 /* We only process two relocs. */ 2622 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET 2623 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE) 2624 continue; 2625 2626 /* We process relocs in a distinctly different way when this is a 2627 relocatable link (for one, we don't look at symbols), so we avoid 2628 mixing its code with that for the "normal" relaxation. */ 2629 if (bfd_link_relocatable (link_info)) 2630 { 2631 /* The only transformation in a relocatable link is to generate 2632 a full stub at the location of the stub calculated for the 2633 input section, if the relocated stub location, the end of the 2634 output section plus earlier stubs, cannot be reached. Thus 2635 relocatable linking can only lead to worse code, but it still 2636 works. */ 2637 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE) 2638 { 2639 /* If we can reach the end of the output-section and beyond 2640 any current stubs, then we don't need a stub for this 2641 reloc. The relaxed order of output stub allocation may 2642 not exactly match the straightforward order, so we always 2643 assume presence of output stubs, which will allow 2644 relaxation only on relocations indifferent to the 2645 presence of output stub allocations for other relocations 2646 and thus the order of output stub allocation. */ 2647 if (bfd_check_overflow (complain_overflow_signed, 2648 19, 2649 0, 2650 bfd_arch_bits_per_address (abfd), 2651 /* Output-stub location. */ 2652 sec->output_section->rawsize 2653 + (mmix_elf_section_data (sec 2654 ->output_section) 2655 ->pjs.stubs_size_sum) 2656 /* Location of this PUSHJ reloc. */ 2657 - (sec->output_offset + irel->r_offset) 2658 /* Don't count *this* stub twice. */ 2659 - (mmix_elf_section_data (sec) 2660 ->pjs.stub_size[pjsno] 2661 + MAX_PUSHJ_STUB_SIZE)) 2662 == bfd_reloc_ok) 2663 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2664 2665 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2666 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2667 2668 pjsno++; 2669 } 2670 2671 continue; 2672 } 2673 2674 /* Get the value of the symbol referred to by the reloc. */ 2675 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2676 { 2677 /* A local symbol. */ 2678 Elf_Internal_Sym *isym; 2679 asection *sym_sec; 2680 2681 /* Read this BFD's local symbols if we haven't already. */ 2682 if (isymbuf == NULL) 2683 { 2684 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2685 if (isymbuf == NULL) 2686 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2687 symtab_hdr->sh_info, 0, 2688 NULL, NULL, NULL); 2689 if (isymbuf == 0) 2690 goto error_return; 2691 } 2692 2693 isym = isymbuf + ELF64_R_SYM (irel->r_info); 2694 if (isym->st_shndx == SHN_UNDEF) 2695 sym_sec = bfd_und_section_ptr; 2696 else if (isym->st_shndx == SHN_ABS) 2697 sym_sec = bfd_abs_section_ptr; 2698 else if (isym->st_shndx == SHN_COMMON) 2699 sym_sec = bfd_com_section_ptr; 2700 else 2701 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2702 symval = (isym->st_value 2703 + sym_sec->output_section->vma 2704 + sym_sec->output_offset); 2705 } 2706 else 2707 { 2708 unsigned long indx; 2709 2710 /* An external symbol. */ 2711 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2712 h = elf_sym_hashes (abfd)[indx]; 2713 BFD_ASSERT (h != NULL); 2714 if (h->root.type != bfd_link_hash_defined 2715 && h->root.type != bfd_link_hash_defweak) 2716 { 2717 /* This appears to be a reference to an undefined symbol. Just 2718 ignore it--it will be caught by the regular reloc processing. 2719 We need to keep BPO reloc accounting consistent, though 2720 else we'll abort instead of emitting an error message. */ 2721 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET 2722 && gregdata != NULL) 2723 { 2724 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2725 bpono++; 2726 } 2727 continue; 2728 } 2729 2730 symval = (h->root.u.def.value 2731 + h->root.u.def.section->output_section->vma 2732 + h->root.u.def.section->output_offset); 2733 } 2734 2735 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE) 2736 { 2737 bfd_vma value = symval + irel->r_addend; 2738 bfd_vma dot 2739 = (sec->output_section->vma 2740 + sec->output_offset 2741 + irel->r_offset); 2742 bfd_vma stubaddr 2743 = (sec->output_section->vma 2744 + sec->output_offset 2745 + size 2746 + mmix_elf_section_data (sec)->pjs.stubs_size_sum); 2747 2748 if ((value & 3) == 0 2749 && bfd_check_overflow (complain_overflow_signed, 2750 19, 2751 0, 2752 bfd_arch_bits_per_address (abfd), 2753 value - dot 2754 - (value > dot 2755 ? mmix_elf_section_data (sec) 2756 ->pjs.stub_size[pjsno] 2757 : 0)) 2758 == bfd_reloc_ok) 2759 /* If the reloc fits, no stub is needed. */ 2760 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2761 else 2762 /* Maybe we can get away with just a JMP insn? */ 2763 if ((value & 3) == 0 2764 && bfd_check_overflow (complain_overflow_signed, 2765 27, 2766 0, 2767 bfd_arch_bits_per_address (abfd), 2768 value - stubaddr 2769 - (value > dot 2770 ? mmix_elf_section_data (sec) 2771 ->pjs.stub_size[pjsno] - 4 2772 : 0)) 2773 == bfd_reloc_ok) 2774 /* Yep, account for a stub consisting of a single JMP insn. */ 2775 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4; 2776 else 2777 /* Nope, go for the full insn stub. It doesn't seem useful to 2778 emit the intermediate sizes; those will only be useful for 2779 a >64M program assuming contiguous code. */ 2780 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] 2781 = MAX_PUSHJ_STUB_SIZE; 2782 2783 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2784 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2785 pjsno++; 2786 continue; 2787 } 2788 2789 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */ 2790 2791 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value 2792 = symval + irel->r_addend; 2793 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE; 2794 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2795 } 2796 2797 /* Check if that was the last BPO-reloc. If so, sort the values and 2798 calculate how many registers we need to cover them. Set the size of 2799 the linker gregs, and if the number of registers changed, indicate 2800 that we need to relax some more because we have more work to do. */ 2801 if (gregdata != NULL 2802 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0) 2803 { 2804 size_t i; 2805 bfd_vma prev_base; 2806 size_t regindex; 2807 2808 /* First, reset the remaining relocs for the next round. */ 2809 gregdata->n_remaining_bpo_relocs_this_relaxation_round 2810 = gregdata->n_bpo_relocs; 2811 2812 qsort (gregdata->reloc_request, 2813 gregdata->n_max_bpo_relocs, 2814 sizeof (struct bpo_reloc_request), 2815 bpo_reloc_request_sort_fn); 2816 2817 /* Recalculate indexes. When we find a change (however unlikely 2818 after the initial iteration), we know we need to relax again, 2819 since items in the GREG-array are sorted by increasing value and 2820 stored in the relaxation phase. */ 2821 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2822 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2823 != i) 2824 { 2825 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2826 = i; 2827 *again = TRUE; 2828 } 2829 2830 /* Allocate register numbers (indexing from 0). Stop at the first 2831 non-valid reloc. */ 2832 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value; 2833 i < gregdata->n_bpo_relocs; 2834 i++) 2835 { 2836 if (gregdata->reloc_request[i].value > prev_base + 255) 2837 { 2838 regindex++; 2839 prev_base = gregdata->reloc_request[i].value; 2840 } 2841 gregdata->reloc_request[i].regindex = regindex; 2842 gregdata->reloc_request[i].offset 2843 = gregdata->reloc_request[i].value - prev_base; 2844 } 2845 2846 /* If it's not the same as the last time, we need to relax again, 2847 because the size of the section has changed. I'm not sure we 2848 actually need to do any adjustments since the shrinking happens 2849 at the start of this section, but better safe than sorry. */ 2850 if (gregdata->n_allocated_bpo_gregs != regindex + 1) 2851 { 2852 gregdata->n_allocated_bpo_gregs = regindex + 1; 2853 *again = TRUE; 2854 } 2855 2856 bpo_gregs_section->size = (regindex + 1) * 8; 2857 } 2858 2859 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2860 { 2861 if (! link_info->keep_memory) 2862 free (isymbuf); 2863 else 2864 { 2865 /* Cache the symbols for elf_link_input_bfd. */ 2866 symtab_hdr->contents = (unsigned char *) isymbuf; 2867 } 2868 } 2869 2870 if (internal_relocs != NULL 2871 && elf_section_data (sec)->relocs != internal_relocs) 2872 free (internal_relocs); 2873 2874 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2875 abort (); 2876 2877 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2878 { 2879 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum; 2880 *again = TRUE; 2881 } 2882 2883 return TRUE; 2884 2885 error_return: 2886 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2887 free (isymbuf); 2888 if (internal_relocs != NULL 2889 && elf_section_data (sec)->relocs != internal_relocs) 2890 free (internal_relocs); 2891 return FALSE; 2892} 2893 2894#define ELF_ARCH bfd_arch_mmix 2895#define ELF_MACHINE_CODE EM_MMIX 2896 2897/* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL). 2898 However, that's too much for something somewhere in the linker part of 2899 BFD; perhaps the start-address has to be a non-zero multiple of this 2900 number, or larger than this number. The symptom is that the linker 2901 complains: "warning: allocated section `.text' not in segment". We 2902 settle for 64k; the page-size used in examples is 8k. 2903 #define ELF_MAXPAGESIZE 0x10000 2904 2905 Unfortunately, this causes excessive padding in the supposedly small 2906 for-education programs that are the expected usage (where people would 2907 inspect output). We stick to 256 bytes just to have *some* default 2908 alignment. */ 2909#define ELF_MAXPAGESIZE 0x100 2910 2911#define TARGET_BIG_SYM mmix_elf64_vec 2912#define TARGET_BIG_NAME "elf64-mmix" 2913 2914#define elf_info_to_howto_rel NULL 2915#define elf_info_to_howto mmix_info_to_howto_rela 2916#define elf_backend_relocate_section mmix_elf_relocate_section 2917#define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook 2918#define elf_backend_gc_sweep_hook mmix_elf_gc_sweep_hook 2919 2920#define elf_backend_link_output_symbol_hook \ 2921 mmix_elf_link_output_symbol_hook 2922#define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook 2923 2924#define elf_backend_check_relocs mmix_elf_check_relocs 2925#define elf_backend_symbol_processing mmix_elf_symbol_processing 2926#define elf_backend_omit_section_dynsym \ 2927 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 2928 2929#define bfd_elf64_bfd_is_local_label_name \ 2930 mmix_elf_is_local_label_name 2931 2932#define elf_backend_may_use_rel_p 0 2933#define elf_backend_may_use_rela_p 1 2934#define elf_backend_default_use_rela_p 1 2935 2936#define elf_backend_can_gc_sections 1 2937#define elf_backend_section_from_bfd_section \ 2938 mmix_elf_section_from_bfd_section 2939 2940#define bfd_elf64_new_section_hook mmix_elf_new_section_hook 2941#define bfd_elf64_bfd_final_link mmix_elf_final_link 2942#define bfd_elf64_bfd_relax_section mmix_elf_relax_section 2943 2944#include "elf64-target.h" 2945