elf64-mmix.c revision 1.1.1.10
1 /* MMIX-specific support for 64-bit ELF. 2 Copyright (C) 2001-2024 Free Software Foundation, Inc. 3 Contributed by Hans-Peter Nilsson <hp (at) 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 51 struct _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 bool has_warned_bpo; 83 bool 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. */ 92 struct 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. */ 111 struct 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 bool 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. */ 137 struct 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 }; 167 168 169 extern bool mmix_elf_final_link (bfd *, struct bfd_link_info *); 170 171 extern void mmix_elf_symbol_processing (bfd *, asymbol *); 172 173 /* Only intended to be called from a debugger. */ 174 extern void mmix_dump_bpo_gregs 175 (struct bfd_link_info *, void (*) (const char *, ...)); 176 177 static void 178 mmix_set_relaxable_size (bfd *, asection *, void *); 179 static bfd_reloc_status_type 180 mmix_elf_reloc (bfd *, arelent *, asymbol *, void *, 181 asection *, bfd *, char **); 182 static bfd_reloc_status_type 183 mmix_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. */ 190 static reloc_howto_type elf_mmix_howto_table[] = 191 { 192 /* This reloc does nothing. */ 193 HOWTO (R_MMIX_NONE, /* type */ 194 0, /* rightshift */ 195 0, /* size */ 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 1, /* size */ 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 2, /* size */ 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 4, /* size */ 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 4, /* size */ 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 8, /* size */ 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 1, /* size */ 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 2, /* size */ 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 4, /* size */ 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 4, /* size */ 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 8, /* size */ 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 */ 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 */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 4, /* size */ 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 2, /* size */ 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 2, /* size */ 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 8, /* size */ 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 */ 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 4, /* size */ 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. */ 759 760 struct mmix_reloc_map 761 { 762 bfd_reloc_code_real_type bfd_reloc_val; 763 enum elf_mmix_reloc_type elf_reloc_val; 764 }; 765 766 767 static 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 }; 794 795 static reloc_howto_type * 796 bfd_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 } 811 812 static reloc_howto_type * 813 bfd_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 } 827 828 static bool 829 mmix_elf_new_section_hook (bfd *abfd, asection *sec) 830 { 831 if (!sec->used_by_bfd) 832 { 833 struct _mmix_elf_section_data *sdata; 834 size_t 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. */ 892 893 static bfd_reloc_status_type 894 mmix_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 " please use the objcopy program to convert from" 987 " ELF or mmo," 988 " 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 " please use the objcopy program to convert from" 1171 " ELF or mmo," 1172 " 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 (_("%pB: Internal inconsistency error for value for\n\ 1196 linker-allocated global register: linked: %#" PRIx64 " != relaxed: %#" PRIx64 ""), 1197 isec->owner, 1198 (uint64_t) value, 1199 (uint64_t) gregdata->reloc_request[bpo_index].value); 1200 bfd_set_error (bfd_error_bad_value); 1201 return bfd_reloc_overflow; 1202 } 1203 1204 /* Then store the register number and offset for that register 1205 into datap and datap + 1 respectively. */ 1206 bfd_put_8 (abfd, 1207 gregdata->reloc_request[bpo_index].regindex 1208 + bpo_greg_section->output_section->vma / 8, 1209 datap); 1210 bfd_put_8 (abfd, 1211 gregdata->reloc_request[bpo_index].offset, 1212 ((unsigned char *) datap) + 1); 1213 return bfd_reloc_ok; 1214 } 1215 1216 case R_MMIX_REG_OR_BYTE: 1217 case R_MMIX_REG: 1218 if (value > 255) 1219 return bfd_reloc_overflow; 1220 bfd_put_8 (abfd, value, datap); 1221 return bfd_reloc_ok; 1222 1223 default: 1224 BAD_CASE (howto->type); 1225 } 1226 1227 /* This code adds the common SETL/INCML/INCMH/INCH worst-case 1228 sequence. */ 1229 1230 /* Lowest two bits must be 0. We return bfd_reloc_overflow for 1231 everything that looks strange. */ 1232 if (value & 3) 1233 flag = bfd_reloc_overflow; 1234 1235 bfd_put_32 (abfd, 1236 (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16), 1237 (bfd_byte *) datap + offs); 1238 bfd_put_32 (abfd, 1239 (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16), 1240 (bfd_byte *) datap + offs + 4); 1241 bfd_put_32 (abfd, 1242 (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16), 1243 (bfd_byte *) datap + offs + 8); 1244 bfd_put_32 (abfd, 1245 (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16), 1246 (bfd_byte *) datap + offs + 12); 1247 1248 return flag; 1249 } 1250 1251 /* Set the howto pointer for an MMIX ELF reloc (type RELA). */ 1252 1253 static bool 1254 mmix_info_to_howto_rela (bfd *abfd, 1255 arelent *cache_ptr, 1256 Elf_Internal_Rela *dst) 1257 { 1258 unsigned int r_type; 1259 1260 r_type = ELF64_R_TYPE (dst->r_info); 1261 if (r_type >= (unsigned int) R_MMIX_max) 1262 { 1263 /* xgettext:c-format */ 1264 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 1265 abfd, r_type); 1266 bfd_set_error (bfd_error_bad_value); 1267 return false; 1268 } 1269 cache_ptr->howto = &elf_mmix_howto_table[r_type]; 1270 return true; 1271 } 1272 1273 /* Any MMIX-specific relocation gets here at assembly time or when linking 1274 to other formats (such as mmo); this is the relocation function from 1275 the reloc_table. We don't get here for final pure ELF linking. */ 1276 1277 static bfd_reloc_status_type 1278 mmix_elf_reloc (bfd *abfd, 1279 arelent *reloc_entry, 1280 asymbol *symbol, 1281 void * data, 1282 asection *input_section, 1283 bfd *output_bfd, 1284 char **error_message) 1285 { 1286 bfd_vma relocation; 1287 bfd_reloc_status_type r; 1288 asection *reloc_target_output_section; 1289 bfd_reloc_status_type flag = bfd_reloc_ok; 1290 bfd_vma output_base = 0; 1291 1292 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 1293 input_section, output_bfd, error_message); 1294 1295 /* If that was all that was needed (i.e. this isn't a final link, only 1296 some segment adjustments), we're done. */ 1297 if (r != bfd_reloc_continue) 1298 return r; 1299 1300 if (bfd_is_und_section (symbol->section) 1301 && (symbol->flags & BSF_WEAK) == 0 1302 && output_bfd == (bfd *) NULL) 1303 return bfd_reloc_undefined; 1304 1305 /* Is the address of the relocation really within the section? */ 1306 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 1307 return bfd_reloc_outofrange; 1308 1309 /* Work out which section the relocation is targeted at and the 1310 initial relocation command value. */ 1311 1312 /* Get symbol value. (Common symbols are special.) */ 1313 if (bfd_is_com_section (symbol->section)) 1314 relocation = 0; 1315 else 1316 relocation = symbol->value; 1317 1318 reloc_target_output_section = bfd_asymbol_section (symbol)->output_section; 1319 1320 /* Here the variable relocation holds the final address of the symbol we 1321 are relocating against, plus any addend. */ 1322 if (output_bfd) 1323 output_base = 0; 1324 else 1325 output_base = reloc_target_output_section->vma; 1326 1327 relocation += output_base + symbol->section->output_offset; 1328 1329 if (output_bfd != (bfd *) NULL) 1330 { 1331 /* Add in supplied addend. */ 1332 relocation += reloc_entry->addend; 1333 1334 /* This is a partial relocation, and we want to apply the 1335 relocation to the reloc entry rather than the raw data. 1336 Modify the reloc inplace to reflect what we now know. */ 1337 reloc_entry->addend = relocation; 1338 reloc_entry->address += input_section->output_offset; 1339 return flag; 1340 } 1341 1342 return mmix_final_link_relocate (reloc_entry->howto, input_section, 1343 data, reloc_entry->address, 1344 reloc_entry->addend, relocation, 1345 bfd_asymbol_name (symbol), 1346 reloc_target_output_section, 1347 error_message); 1348 } 1349 1350 /* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it 1352 for guidance if you're thinking of copying this. */ 1353 1354 static int 1355 mmix_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, 1356 struct bfd_link_info *info, 1357 bfd *input_bfd, 1358 asection *input_section, 1359 bfd_byte *contents, 1360 Elf_Internal_Rela *relocs, 1361 Elf_Internal_Sym *local_syms, 1362 asection **local_sections) 1363 { 1364 Elf_Internal_Shdr *symtab_hdr; 1365 struct elf_link_hash_entry **sym_hashes; 1366 Elf_Internal_Rela *rel; 1367 Elf_Internal_Rela *relend; 1368 bfd_size_type size; 1369 size_t pjsno = 0; 1370 1371 size = input_section->rawsize ? input_section->rawsize : input_section->size; 1372 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1373 sym_hashes = elf_sym_hashes (input_bfd); 1374 relend = relocs + input_section->reloc_count; 1375 1376 /* Zero the stub area before we start. */ 1377 if (input_section->rawsize != 0 1378 && input_section->size > input_section->rawsize) 1379 memset (contents + input_section->rawsize, 0, 1380 input_section->size - input_section->rawsize); 1381 1382 for (rel = relocs; rel < relend; rel ++) 1383 { 1384 reloc_howto_type *howto; 1385 unsigned long r_symndx; 1386 Elf_Internal_Sym *sym; 1387 asection *sec; 1388 struct elf_link_hash_entry *h; 1389 bfd_vma relocation; 1390 bfd_reloc_status_type r; 1391 const char *name = NULL; 1392 int r_type; 1393 bool undefined_signalled = false; 1394 1395 r_type = ELF64_R_TYPE (rel->r_info); 1396 1397 if (r_type == R_MMIX_GNU_VTINHERIT 1398 || r_type == R_MMIX_GNU_VTENTRY) 1399 continue; 1400 1401 r_symndx = ELF64_R_SYM (rel->r_info); 1402 1403 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info); 1404 h = NULL; 1405 sym = NULL; 1406 sec = NULL; 1407 1408 if (r_symndx < symtab_hdr->sh_info) 1409 { 1410 sym = local_syms + r_symndx; 1411 sec = local_sections [r_symndx]; 1412 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1413 1414 name = bfd_elf_string_from_elf_section (input_bfd, 1415 symtab_hdr->sh_link, 1416 sym->st_name); 1417 if (name == NULL) 1418 name = bfd_section_name (sec); 1419 } 1420 else 1421 { 1422 bool unresolved_reloc, ignored; 1423 1424 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1425 r_symndx, symtab_hdr, sym_hashes, 1426 h, sec, relocation, 1427 unresolved_reloc, undefined_signalled, 1428 ignored); 1429 name = h->root.root.string; 1430 } 1431 1432 if (sec != NULL && discarded_section (sec)) 1433 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1434 rel, 1, relend, howto, 0, contents); 1435 1436 if (bfd_link_relocatable (info)) 1437 { 1438 /* This is a relocatable link. For most relocs we don't have to 1439 change anything, unless the reloc is against a section 1440 symbol, in which case we have to adjust according to where 1441 the section symbol winds up in the output section. */ 1442 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 1443 rel->r_addend += sec->output_offset; 1444 1445 /* For PUSHJ stub relocs however, we may need to change the 1446 reloc and the section contents, if the reloc doesn't reach 1447 beyond the end of the output section and previous stubs. 1448 Then we change the section contents to be a PUSHJ to the end 1449 of the input section plus stubs (we can do that without using 1450 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ 1451 at the stub location. */ 1452 if (r_type == R_MMIX_PUSHJ_STUBBABLE) 1453 { 1454 /* We've already checked whether we need a stub; use that 1455 knowledge. */ 1456 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno] 1457 != 0) 1458 { 1459 Elf_Internal_Rela relcpy; 1460 1461 if (mmix_elf_section_data (input_section) 1462 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE) 1463 abort (); 1464 1465 /* There's already a PUSHJ insn there, so just fill in 1466 the offset bits to the stub. */ 1467 if (mmix_final_link_relocate (elf_mmix_howto_table 1468 + R_MMIX_ADDR19, 1469 input_section, 1470 contents, 1471 rel->r_offset, 1472 0, 1473 input_section 1474 ->output_section->vma 1475 + input_section->output_offset 1476 + size 1477 + mmix_elf_section_data (input_section) 1478 ->pjs.stub_offset, 1479 NULL, NULL, NULL) != bfd_reloc_ok) 1480 return false; 1481 1482 /* Put a JMP insn at the stub; it goes with the 1483 R_MMIX_JMP reloc. */ 1484 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24, 1485 contents 1486 + size 1487 + mmix_elf_section_data (input_section) 1488 ->pjs.stub_offset); 1489 1490 /* Change the reloc to be at the stub, and to a full 1491 R_MMIX_JMP reloc. */ 1492 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP); 1493 rel->r_offset 1494 = (size 1495 + mmix_elf_section_data (input_section) 1496 ->pjs.stub_offset); 1497 1498 mmix_elf_section_data (input_section)->pjs.stub_offset 1499 += MAX_PUSHJ_STUB_SIZE; 1500 1501 /* Shift this reloc to the end of the relocs to maintain 1502 the r_offset sorted reloc order. */ 1503 relcpy = *rel; 1504 memmove (rel, rel + 1, (char *) relend - (char *) rel); 1505 relend[-1] = relcpy; 1506 1507 /* Back up one reloc, or else we'd skip the next reloc 1508 in turn. */ 1509 rel--; 1510 } 1511 1512 pjsno++; 1513 } 1514 continue; 1515 } 1516 1517 r = mmix_final_link_relocate (howto, input_section, 1518 contents, rel->r_offset, 1519 rel->r_addend, relocation, name, sec, NULL); 1520 1521 if (r != bfd_reloc_ok) 1522 { 1523 const char * msg = (const char *) NULL; 1524 1525 switch (r) 1526 { 1527 case bfd_reloc_overflow: 1528 info->callbacks->reloc_overflow 1529 (info, (h ? &h->root : NULL), name, howto->name, 1530 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1531 break; 1532 1533 case bfd_reloc_undefined: 1534 /* We may have sent this message above. */ 1535 if (! undefined_signalled) 1536 info->callbacks->undefined_symbol 1537 (info, name, input_bfd, input_section, rel->r_offset, true); 1538 undefined_signalled = true; 1539 break; 1540 1541 case bfd_reloc_outofrange: 1542 msg = _("internal error: out of range error"); 1543 break; 1544 1545 case bfd_reloc_notsupported: 1546 msg = _("internal error: unsupported relocation error"); 1547 break; 1548 1549 case bfd_reloc_dangerous: 1550 msg = _("internal error: dangerous relocation"); 1551 break; 1552 1553 default: 1554 msg = _("internal error: unknown error"); 1555 break; 1556 } 1557 1558 if (msg) 1559 (*info->callbacks->warning) (info, msg, name, input_bfd, 1560 input_section, rel->r_offset); 1561 } 1562 } 1563 1564 return true; 1565 } 1566 1567 /* Perform a single relocation. By default we use the standard BFD 1569 routines. A few relocs we have to do ourselves. */ 1570 1571 static bfd_reloc_status_type 1572 mmix_final_link_relocate (reloc_howto_type *howto, asection *input_section, 1573 bfd_byte *contents, bfd_vma r_offset, 1574 bfd_signed_vma r_addend, bfd_vma relocation, 1575 const char *symname, asection *symsec, 1576 char **error_message) 1577 { 1578 bfd_reloc_status_type r = bfd_reloc_ok; 1579 bfd_vma addr 1580 = (input_section->output_section->vma 1581 + input_section->output_offset 1582 + r_offset); 1583 bfd_signed_vma srel 1584 = (bfd_signed_vma) relocation + r_addend; 1585 1586 switch (howto->type) 1587 { 1588 /* All these are PC-relative. */ 1589 case R_MMIX_PUSHJ_STUBBABLE: 1590 case R_MMIX_PUSHJ: 1591 case R_MMIX_CBRANCH: 1592 case R_MMIX_ADDR19: 1593 case R_MMIX_GETA: 1594 case R_MMIX_ADDR27: 1595 case R_MMIX_JMP: 1596 contents += r_offset; 1597 1598 srel -= (input_section->output_section->vma 1599 + input_section->output_offset 1600 + r_offset); 1601 1602 r = mmix_elf_perform_relocation (input_section, howto, contents, 1603 addr, srel, error_message); 1604 break; 1605 1606 case R_MMIX_BASE_PLUS_OFFSET: 1607 if (symsec == NULL) 1608 return bfd_reloc_undefined; 1609 1610 /* Check that we're not relocating against a register symbol. */ 1611 if (strcmp (bfd_section_name (symsec), 1612 MMIX_REG_CONTENTS_SECTION_NAME) == 0 1613 || strcmp (bfd_section_name (symsec), 1614 MMIX_REG_SECTION_NAME) == 0) 1615 { 1616 /* Note: This is separated out into two messages in order 1617 to ease the translation into other languages. */ 1618 if (symname == NULL || *symname == 0) 1619 _bfd_error_handler 1620 /* xgettext:c-format */ 1621 (_("%pB: base-plus-offset relocation against register symbol:" 1622 " (unknown) in %pA"), 1623 input_section->owner, symsec); 1624 else 1625 _bfd_error_handler 1626 /* xgettext:c-format */ 1627 (_("%pB: base-plus-offset relocation against register symbol:" 1628 " %s in %pA"), 1629 input_section->owner, symname, symsec); 1630 return bfd_reloc_overflow; 1631 } 1632 goto do_mmix_reloc; 1633 1634 case R_MMIX_REG_OR_BYTE: 1635 case R_MMIX_REG: 1636 /* For now, we handle these alike. They must refer to an register 1637 symbol, which is either relative to the register section and in 1638 the range 0..255, or is in the register contents section with vma 1639 regno * 8. */ 1640 1641 /* FIXME: A better way to check for reg contents section? 1642 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */ 1643 if (symsec == NULL) 1644 return bfd_reloc_undefined; 1645 1646 if (strcmp (bfd_section_name (symsec), 1647 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1648 { 1649 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1650 { 1651 /* The bfd_reloc_outofrange return value, though intuitively 1652 a better value, will not get us an error. */ 1653 return bfd_reloc_overflow; 1654 } 1655 srel /= 8; 1656 } 1657 else if (strcmp (bfd_section_name (symsec), 1658 MMIX_REG_SECTION_NAME) == 0) 1659 { 1660 if (srel < 0 || srel > 255) 1661 /* The bfd_reloc_outofrange return value, though intuitively a 1662 better value, will not get us an error. */ 1663 return bfd_reloc_overflow; 1664 } 1665 else 1666 { 1667 /* Note: This is separated out into two messages in order 1668 to ease the translation into other languages. */ 1669 if (symname == NULL || *symname == 0) 1670 _bfd_error_handler 1671 /* xgettext:c-format */ 1672 (_("%pB: register relocation against non-register symbol:" 1673 " (unknown) in %pA"), 1674 input_section->owner, symsec); 1675 else 1676 _bfd_error_handler 1677 /* xgettext:c-format */ 1678 (_("%pB: register relocation against non-register symbol:" 1679 " %s in %pA"), 1680 input_section->owner, symname, symsec); 1681 1682 /* The bfd_reloc_outofrange return value, though intuitively a 1683 better value, will not get us an error. */ 1684 return bfd_reloc_overflow; 1685 } 1686 do_mmix_reloc: 1687 contents += r_offset; 1688 r = mmix_elf_perform_relocation (input_section, howto, contents, 1689 addr, srel, error_message); 1690 break; 1691 1692 case R_MMIX_LOCAL: 1693 /* This isn't a real relocation, it's just an assertion that the 1694 final relocation value corresponds to a local register. We 1695 ignore the actual relocation; nothing is changed. */ 1696 { 1697 asection *regsec 1698 = bfd_get_section_by_name (input_section->output_section->owner, 1699 MMIX_REG_CONTENTS_SECTION_NAME); 1700 bfd_vma first_global; 1701 1702 /* Check that this is an absolute value, or a reference to the 1703 register contents section or the register (symbol) section. 1704 Absolute numbers can get here as undefined section. Undefined 1705 symbols are signalled elsewhere, so there's no conflict in us 1706 accidentally handling it. */ 1707 if (!bfd_is_abs_section (symsec) 1708 && !bfd_is_und_section (symsec) 1709 && strcmp (bfd_section_name (symsec), 1710 MMIX_REG_CONTENTS_SECTION_NAME) != 0 1711 && strcmp (bfd_section_name (symsec), 1712 MMIX_REG_SECTION_NAME) != 0) 1713 { 1714 _bfd_error_handler 1715 (_("%pB: directive LOCAL valid only with a register or absolute value"), 1716 input_section->owner); 1717 1718 return bfd_reloc_overflow; 1719 } 1720 1721 /* If we don't have a register contents section, then $255 is the 1722 first global register. */ 1723 if (regsec == NULL) 1724 first_global = 255; 1725 else 1726 { 1727 first_global = bfd_section_vma (regsec) / 8; 1728 if (strcmp (bfd_section_name (symsec), 1729 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1730 { 1731 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1732 /* The bfd_reloc_outofrange return value, though 1733 intuitively a better value, will not get us an error. */ 1734 return bfd_reloc_overflow; 1735 srel /= 8; 1736 } 1737 } 1738 1739 if ((bfd_vma) srel >= first_global) 1740 { 1741 /* FIXME: Better error message. */ 1742 _bfd_error_handler 1743 /* xgettext:c-format */ 1744 (_("%pB: LOCAL directive: " 1745 "register $%" PRId64 " is not a local register;" 1746 " first global register is $%" PRId64), 1747 input_section->owner, (int64_t) srel, (int64_t) first_global); 1748 1749 return bfd_reloc_overflow; 1750 } 1751 } 1752 r = bfd_reloc_ok; 1753 break; 1754 1755 default: 1756 r = _bfd_final_link_relocate (howto, input_section->owner, input_section, 1757 contents, r_offset, 1758 relocation, r_addend); 1759 } 1760 1761 return r; 1762 } 1763 1764 /* Return the section that should be marked against GC for a given 1766 relocation. */ 1767 1768 static asection * 1769 mmix_elf_gc_mark_hook (asection *sec, 1770 struct bfd_link_info *info, 1771 Elf_Internal_Rela *rel, 1772 struct elf_link_hash_entry *h, 1773 Elf_Internal_Sym *sym) 1774 { 1775 if (h != NULL) 1776 switch (ELF64_R_TYPE (rel->r_info)) 1777 { 1778 case R_MMIX_GNU_VTINHERIT: 1779 case R_MMIX_GNU_VTENTRY: 1780 return NULL; 1781 } 1782 1783 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1784 } 1785 1786 /* Sort register relocs to come before expanding relocs. */ 1788 1789 static int 1790 mmix_elf_sort_relocs (const void * p1, const void * p2) 1791 { 1792 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1; 1793 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2; 1794 int r1_is_reg, r2_is_reg; 1795 1796 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive 1797 insns. */ 1798 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3)) 1799 return 1; 1800 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3)) 1801 return -1; 1802 1803 r1_is_reg 1804 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE 1805 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG); 1806 r2_is_reg 1807 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE 1808 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG); 1809 if (r1_is_reg != r2_is_reg) 1810 return r2_is_reg - r1_is_reg; 1811 1812 /* Neither or both are register relocs. Then sort on full offset. */ 1813 if (r1->r_offset > r2->r_offset) 1814 return 1; 1815 else if (r1->r_offset < r2->r_offset) 1816 return -1; 1817 return 0; 1818 } 1819 1820 /* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */ 1821 1822 static bool 1823 mmix_elf_check_common_relocs (bfd *abfd, 1824 struct bfd_link_info *info, 1825 asection *sec, 1826 const Elf_Internal_Rela *relocs) 1827 { 1828 bfd *bpo_greg_owner = NULL; 1829 asection *allocated_gregs_section = NULL; 1830 struct bpo_greg_section_info *gregdata = NULL; 1831 struct bpo_reloc_section_info *bpodata = NULL; 1832 const Elf_Internal_Rela *rel; 1833 const Elf_Internal_Rela *rel_end; 1834 1835 /* We currently have to abuse this COFF-specific member, since there's 1836 no target-machine-dedicated member. There's no alternative outside 1837 the bfd_link_info struct; we can't specialize a hash-table since 1838 they're different between ELF and mmo. */ 1839 bpo_greg_owner = (bfd *) info->base_file; 1840 1841 rel_end = relocs + sec->reloc_count; 1842 for (rel = relocs; rel < rel_end; rel++) 1843 { 1844 switch (ELF64_R_TYPE (rel->r_info)) 1845 { 1846 /* This relocation causes a GREG allocation. We need to count 1847 them, and we need to create a section for them, so we need an 1848 object to fake as the owner of that section. We can't use 1849 the ELF dynobj for this, since the ELF bits assume lots of 1850 DSO-related stuff if that member is non-NULL. */ 1851 case R_MMIX_BASE_PLUS_OFFSET: 1852 /* We don't do anything with this reloc for a relocatable link. */ 1853 if (bfd_link_relocatable (info)) 1854 break; 1855 1856 if (bpo_greg_owner == NULL) 1857 { 1858 bpo_greg_owner = abfd; 1859 info->base_file = bpo_greg_owner; 1860 } 1861 1862 if (allocated_gregs_section == NULL) 1863 allocated_gregs_section 1864 = bfd_get_section_by_name (bpo_greg_owner, 1865 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 1866 1867 if (allocated_gregs_section == NULL) 1868 { 1869 allocated_gregs_section 1870 = bfd_make_section_with_flags (bpo_greg_owner, 1871 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME, 1872 (SEC_HAS_CONTENTS 1873 | SEC_IN_MEMORY 1874 | SEC_LINKER_CREATED)); 1875 /* Setting both SEC_ALLOC and SEC_LOAD means the section is 1876 treated like any other section, and we'd get errors for 1877 address overlap with the text section. Let's set none of 1878 those flags, as that is what currently happens for usual 1879 GREG allocations, and that works. */ 1880 if (allocated_gregs_section == NULL 1881 || !bfd_set_section_alignment (allocated_gregs_section, 3)) 1882 return false; 1883 1884 gregdata = (struct bpo_greg_section_info *) 1885 bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info)); 1886 if (gregdata == NULL) 1887 return false; 1888 mmix_elf_section_data (allocated_gregs_section)->bpo.greg 1889 = gregdata; 1890 } 1891 else if (gregdata == NULL) 1892 gregdata 1893 = mmix_elf_section_data (allocated_gregs_section)->bpo.greg; 1894 1895 /* Get ourselves some auxiliary info for the BPO-relocs. */ 1896 if (bpodata == NULL) 1897 { 1898 /* No use doing a separate iteration pass to find the upper 1899 limit - just use the number of relocs. */ 1900 bpodata = (struct bpo_reloc_section_info *) 1901 bfd_alloc (bpo_greg_owner, 1902 sizeof (struct bpo_reloc_section_info) 1903 * (sec->reloc_count + 1)); 1904 if (bpodata == NULL) 1905 return false; 1906 mmix_elf_section_data (sec)->bpo.reloc = bpodata; 1907 bpodata->first_base_plus_offset_reloc 1908 = bpodata->bpo_index 1909 = gregdata->n_max_bpo_relocs; 1910 bpodata->bpo_greg_section 1911 = allocated_gregs_section; 1912 bpodata->n_bpo_relocs_this_section = 0; 1913 } 1914 1915 bpodata->n_bpo_relocs_this_section++; 1916 gregdata->n_max_bpo_relocs++; 1917 1918 /* We don't get another chance to set this before GC; we've not 1919 set up any hook that runs before GC. */ 1920 gregdata->n_bpo_relocs 1921 = gregdata->n_max_bpo_relocs; 1922 break; 1923 1924 case R_MMIX_PUSHJ_STUBBABLE: 1925 mmix_elf_section_data (sec)->pjs.n_pushj_relocs++; 1926 break; 1927 } 1928 } 1929 1930 /* Allocate per-reloc stub storage and initialize it to the max stub 1931 size. */ 1932 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0) 1933 { 1934 size_t i; 1935 1936 mmix_elf_section_data (sec)->pjs.stub_size 1937 = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs 1938 * sizeof (mmix_elf_section_data (sec) 1939 ->pjs.stub_size[0])); 1940 if (mmix_elf_section_data (sec)->pjs.stub_size == NULL) 1941 return false; 1942 1943 for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++) 1944 mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE; 1945 } 1946 1947 return true; 1948 } 1949 1950 /* Look through the relocs for a section during the first phase. */ 1951 1952 static bool 1953 mmix_elf_check_relocs (bfd *abfd, 1954 struct bfd_link_info *info, 1955 asection *sec, 1956 const Elf_Internal_Rela *relocs) 1957 { 1958 Elf_Internal_Shdr *symtab_hdr; 1959 struct elf_link_hash_entry **sym_hashes; 1960 const Elf_Internal_Rela *rel; 1961 const Elf_Internal_Rela *rel_end; 1962 1963 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1964 sym_hashes = elf_sym_hashes (abfd); 1965 1966 /* First we sort the relocs so that any register relocs come before 1967 expansion-relocs to the same insn. FIXME: Not done for mmo. */ 1968 qsort ((void *) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), 1969 mmix_elf_sort_relocs); 1970 1971 /* Do the common part. */ 1972 if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs)) 1973 return false; 1974 1975 if (bfd_link_relocatable (info)) 1976 return true; 1977 1978 rel_end = relocs + sec->reloc_count; 1979 for (rel = relocs; rel < rel_end; rel++) 1980 { 1981 struct elf_link_hash_entry *h; 1982 unsigned long r_symndx; 1983 1984 r_symndx = ELF64_R_SYM (rel->r_info); 1985 if (r_symndx < symtab_hdr->sh_info) 1986 h = NULL; 1987 else 1988 { 1989 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1990 while (h->root.type == bfd_link_hash_indirect 1991 || h->root.type == bfd_link_hash_warning) 1992 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1993 } 1994 1995 switch (ELF64_R_TYPE (rel->r_info)) 1996 { 1997 /* This relocation describes the C++ object vtable hierarchy. 1998 Reconstruct it for later use during GC. */ 1999 case R_MMIX_GNU_VTINHERIT: 2000 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2001 return false; 2002 break; 2003 2004 /* This relocation describes which C++ vtable entries are actually 2005 used. Record for later use during GC. */ 2006 case R_MMIX_GNU_VTENTRY: 2007 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2008 return false; 2009 break; 2010 } 2011 } 2012 2013 return true; 2014 } 2015 2016 /* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo. 2017 Copied from elf_link_add_object_symbols. */ 2018 2019 bool 2020 _bfd_mmix_check_all_relocs (bfd *abfd, struct bfd_link_info *info) 2021 { 2022 asection *o; 2023 2024 for (o = abfd->sections; o != NULL; o = o->next) 2025 { 2026 Elf_Internal_Rela *internal_relocs; 2027 bool ok; 2028 2029 if ((o->flags & SEC_RELOC) == 0 2030 || o->reloc_count == 0 2031 || ((info->strip == strip_all || info->strip == strip_debugger) 2032 && (o->flags & SEC_DEBUGGING) != 0) 2033 || bfd_is_abs_section (o->output_section)) 2034 continue; 2035 2036 internal_relocs 2037 = _bfd_elf_link_read_relocs (abfd, o, NULL, 2038 (Elf_Internal_Rela *) NULL, 2039 info->keep_memory); 2040 if (internal_relocs == NULL) 2041 return false; 2042 2043 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs); 2044 2045 if (! info->keep_memory) 2046 free (internal_relocs); 2047 2048 if (! ok) 2049 return false; 2050 } 2051 2052 return true; 2053 } 2054 2055 /* Change symbols relative to the reg contents section to instead be to 2057 the register section, and scale them down to correspond to the register 2058 number. */ 2059 2060 static int 2061 mmix_elf_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED, 2062 const char *name ATTRIBUTE_UNUSED, 2063 Elf_Internal_Sym *sym, 2064 asection *input_sec, 2065 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) 2066 { 2067 if (input_sec != NULL 2068 && input_sec->name != NULL 2069 && ELF_ST_TYPE (sym->st_info) != STT_SECTION 2070 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0) 2071 { 2072 sym->st_value /= 8; 2073 sym->st_shndx = SHN_REGISTER; 2074 } 2075 2076 return 1; 2077 } 2078 2079 /* We fake a register section that holds values that are register numbers. 2080 Having a SHN_REGISTER and register section translates better to other 2081 formats (e.g. mmo) than for example a STT_REGISTER attribute. 2082 This section faking is based on a construct in elf32-mips.c. */ 2083 static asection mmix_elf_reg_section; 2084 static const asymbol mmix_elf_reg_section_symbol = 2085 GLOBAL_SYM_INIT (MMIX_REG_SECTION_NAME, &mmix_elf_reg_section); 2086 static asection mmix_elf_reg_section = 2087 BFD_FAKE_SECTION (mmix_elf_reg_section, &mmix_elf_reg_section_symbol, 2088 MMIX_REG_SECTION_NAME, 0, SEC_NO_FLAGS); 2089 2090 /* Handle the special section numbers that a symbol may use. */ 2091 2092 void 2093 mmix_elf_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, asymbol *asym) 2094 { 2095 elf_symbol_type *elfsym; 2096 2097 elfsym = (elf_symbol_type *) asym; 2098 switch (elfsym->internal_elf_sym.st_shndx) 2099 { 2100 case SHN_REGISTER: 2101 asym->section = &mmix_elf_reg_section; 2102 break; 2103 2104 default: 2105 break; 2106 } 2107 } 2108 2109 /* Given a BFD section, try to locate the corresponding ELF section 2110 index. */ 2111 2112 static bool 2113 mmix_elf_section_from_bfd_section (bfd * abfd ATTRIBUTE_UNUSED, 2114 asection * sec, 2115 int * retval) 2116 { 2117 if (strcmp (bfd_section_name (sec), MMIX_REG_SECTION_NAME) == 0) 2118 *retval = SHN_REGISTER; 2119 else 2120 return false; 2121 2122 return true; 2123 } 2124 2125 /* Hook called by the linker routine which adds symbols from an object 2126 file. We must handle the special SHN_REGISTER section number here. 2127 2128 We also check that we only have *one* each of the section-start 2129 symbols, since otherwise having two with the same value would cause 2130 them to be "merged", but with the contents serialized. */ 2131 2132 static bool 2133 mmix_elf_add_symbol_hook (bfd *abfd, 2134 struct bfd_link_info *info ATTRIBUTE_UNUSED, 2135 Elf_Internal_Sym *sym, 2136 const char **namep ATTRIBUTE_UNUSED, 2137 flagword *flagsp ATTRIBUTE_UNUSED, 2138 asection **secp, 2139 bfd_vma *valp ATTRIBUTE_UNUSED) 2140 { 2141 if (sym->st_shndx == SHN_REGISTER) 2142 { 2143 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME); 2144 (*secp)->flags |= SEC_LINKER_CREATED; 2145 } 2146 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.' 2147 && startswith (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) 2148 { 2149 /* See if we have another one. */ 2150 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash, 2151 *namep, 2152 false, 2153 false, 2154 false); 2155 2156 if (h != NULL && h->type != bfd_link_hash_undefined) 2157 { 2158 /* How do we get the asymbol (or really: the filename) from h? 2159 h->u.def.section->owner is NULL. */ 2160 _bfd_error_handler 2161 /* xgettext:c-format */ 2162 (_("%pB: error: multiple definition of `%s'; start of %s " 2163 "is set in a earlier linked file"), 2164 abfd, *namep, 2165 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)); 2166 bfd_set_error (bfd_error_bad_value); 2167 return false; 2168 } 2169 } 2170 2171 return true; 2172 } 2173 2174 /* We consider symbols matching "L.*:[0-9]+" to be local symbols. */ 2175 2176 static bool 2177 mmix_elf_is_local_label_name (bfd *abfd, const char *name) 2178 { 2179 const char *colpos; 2180 int digits; 2181 2182 /* Also include the default local-label definition. */ 2183 if (_bfd_elf_is_local_label_name (abfd, name)) 2184 return true; 2185 2186 if (*name != 'L') 2187 return false; 2188 2189 /* If there's no ":", or more than one, it's not a local symbol. */ 2190 colpos = strchr (name, ':'); 2191 if (colpos == NULL || strchr (colpos + 1, ':') != NULL) 2192 return false; 2193 2194 /* Check that there are remaining characters and that they are digits. */ 2195 if (colpos[1] == 0) 2196 return false; 2197 2198 digits = strspn (colpos + 1, "0123456789"); 2199 return digits != 0 && colpos[1 + digits] == 0; 2200 } 2201 2202 /* We get rid of the register section here. */ 2203 2204 bool 2205 mmix_elf_final_link (bfd *abfd, struct bfd_link_info *info) 2206 { 2207 /* We never output a register section, though we create one for 2208 temporary measures. Check that nobody entered contents into it. */ 2209 asection *reg_section; 2210 2211 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME); 2212 2213 if (reg_section != NULL) 2214 { 2215 /* FIXME: Pass error state gracefully. */ 2216 if (bfd_section_flags (reg_section) & SEC_HAS_CONTENTS) 2217 _bfd_abort (__FILE__, __LINE__, _("register section has contents\n")); 2218 2219 /* Really remove the section, if it hasn't already been done. */ 2220 if (!bfd_section_removed_from_list (abfd, reg_section)) 2221 { 2222 bfd_section_list_remove (abfd, reg_section); 2223 --abfd->section_count; 2224 } 2225 } 2226 2227 if (! bfd_elf_final_link (abfd, info)) 2228 return false; 2229 2230 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by 2231 the regular linker machinery. We do it here, like other targets with 2232 special sections. */ 2233 if (info->base_file != NULL) 2234 { 2235 asection *greg_section 2236 = bfd_get_section_by_name ((bfd *) info->base_file, 2237 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2238 if (!bfd_set_section_contents (abfd, 2239 greg_section->output_section, 2240 greg_section->contents, 2241 (file_ptr) greg_section->output_offset, 2242 greg_section->size)) 2243 return false; 2244 } 2245 return true; 2246 } 2247 2248 /* We need to include the maximum size of PUSHJ-stubs in the initial 2249 section size. This is expected to shrink during linker relaxation. */ 2250 2251 static void 2252 mmix_set_relaxable_size (bfd *abfd ATTRIBUTE_UNUSED, 2253 asection *sec, 2254 void *ptr) 2255 { 2256 struct bfd_link_info *info = ptr; 2257 2258 /* Make sure we only do this for section where we know we want this, 2259 otherwise we might end up resetting the size of COMMONs. */ 2260 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0) 2261 return; 2262 2263 sec->rawsize = sec->size; 2264 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2265 * MAX_PUSHJ_STUB_SIZE); 2266 2267 /* For use in relocatable link, we start with a max stubs size. See 2268 mmix_elf_relax_section. */ 2269 if (bfd_link_relocatable (info) && sec->output_section) 2270 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum 2271 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2272 * MAX_PUSHJ_STUB_SIZE); 2273 } 2274 2275 /* Initialize stuff for the linker-generated GREGs to match 2276 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */ 2277 2278 bool 2279 _bfd_mmix_before_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2280 struct bfd_link_info *info) 2281 { 2282 asection *bpo_gregs_section; 2283 bfd *bpo_greg_owner; 2284 struct bpo_greg_section_info *gregdata; 2285 size_t n_gregs; 2286 bfd_vma gregs_size; 2287 size_t i; 2288 size_t *bpo_reloc_indexes; 2289 bfd *ibfd; 2290 2291 /* Set the initial size of sections. */ 2292 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 2293 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info); 2294 2295 /* The bpo_greg_owner bfd is supposed to have been set by 2296 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen. 2297 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2298 bpo_greg_owner = (bfd *) info->base_file; 2299 if (bpo_greg_owner == NULL) 2300 return true; 2301 2302 bpo_gregs_section 2303 = bfd_get_section_by_name (bpo_greg_owner, 2304 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2305 2306 if (bpo_gregs_section == NULL) 2307 return true; 2308 2309 /* We use the target-data handle in the ELF section data. */ 2310 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2311 if (gregdata == NULL) 2312 return false; 2313 2314 n_gregs = gregdata->n_bpo_relocs; 2315 gregdata->n_allocated_bpo_gregs = n_gregs; 2316 2317 /* When this reaches zero during relaxation, all entries have been 2318 filled in and the size of the linker gregs can be calculated. */ 2319 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs; 2320 2321 /* Set the zeroth-order estimate for the GREGs size. */ 2322 gregs_size = n_gregs * 8; 2323 2324 if (!bfd_set_section_size (bpo_gregs_section, gregs_size)) 2325 return false; 2326 2327 /* Allocate and set up the GREG arrays. They're filled in at relaxation 2328 time. Note that we must use the max number ever noted for the array, 2329 since the index numbers were created before GC. */ 2330 gregdata->reloc_request 2331 = bfd_zalloc (bpo_greg_owner, 2332 sizeof (struct bpo_reloc_request) 2333 * gregdata->n_max_bpo_relocs); 2334 2335 gregdata->bpo_reloc_indexes 2336 = bpo_reloc_indexes 2337 = bfd_alloc (bpo_greg_owner, 2338 gregdata->n_max_bpo_relocs 2339 * sizeof (size_t)); 2340 if (bpo_reloc_indexes == NULL) 2341 return false; 2342 2343 /* The default order is an identity mapping. */ 2344 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2345 { 2346 bpo_reloc_indexes[i] = i; 2347 gregdata->reloc_request[i].bpo_reloc_no = i; 2348 } 2349 2350 return true; 2351 } 2352 2353 /* Fill in contents in the linker allocated gregs. Everything is 2355 calculated at this point; we just move the contents into place here. */ 2356 2357 bool 2358 _bfd_mmix_after_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2359 struct bfd_link_info *link_info) 2360 { 2361 asection *bpo_gregs_section; 2362 bfd *bpo_greg_owner; 2363 struct bpo_greg_section_info *gregdata; 2364 size_t n_gregs; 2365 size_t i, j; 2366 size_t lastreg; 2367 bfd_byte *contents; 2368 2369 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs 2370 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such 2371 object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2372 bpo_greg_owner = (bfd *) link_info->base_file; 2373 if (bpo_greg_owner == NULL) 2374 return true; 2375 2376 bpo_gregs_section 2377 = bfd_get_section_by_name (bpo_greg_owner, 2378 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2379 2380 /* This can't happen without DSO handling. When DSOs are handled 2381 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such 2382 section. */ 2383 if (bpo_gregs_section == NULL) 2384 return true; 2385 2386 /* We use the target-data handle in the ELF section data. */ 2387 2388 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2389 if (gregdata == NULL) 2390 return false; 2391 2392 n_gregs = gregdata->n_allocated_bpo_gregs; 2393 2394 bpo_gregs_section->contents 2395 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size); 2396 if (contents == NULL) 2397 return false; 2398 2399 /* Sanity check: If these numbers mismatch, some relocation has not been 2400 accounted for and the rest of gregdata is probably inconsistent. 2401 It's a bug, but it's more helpful to identify it than segfaulting 2402 below. */ 2403 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round 2404 != gregdata->n_bpo_relocs) 2405 { 2406 _bfd_error_handler 2407 /* xgettext:c-format */ 2408 (_("internal inconsistency: remaining %lu != max %lu;" 2409 " please report this bug"), 2410 (unsigned long) gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2411 (unsigned long) gregdata->n_bpo_relocs); 2412 return false; 2413 } 2414 2415 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++) 2416 if (gregdata->reloc_request[i].regindex != lastreg) 2417 { 2418 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value, 2419 contents + j * 8); 2420 lastreg = gregdata->reloc_request[i].regindex; 2421 j++; 2422 } 2423 2424 return true; 2425 } 2426 2427 /* Sort valid relocs to come before non-valid relocs, then on increasing 2428 value. */ 2429 2430 static int 2431 bpo_reloc_request_sort_fn (const void * p1, const void * p2) 2432 { 2433 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1; 2434 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2; 2435 2436 /* Primary function is validity; non-valid relocs sorted after valid 2437 ones. */ 2438 if (r1->valid != r2->valid) 2439 return r2->valid - r1->valid; 2440 2441 /* Then sort on value. Don't simplify and return just the difference of 2442 the values: the upper bits of the 64-bit value would be truncated on 2443 a host with 32-bit ints. */ 2444 if (r1->value != r2->value) 2445 return r1->value > r2->value ? 1 : -1; 2446 2447 /* As a last re-sort, use the relocation number, so we get a stable 2448 sort. The *addresses* aren't stable since items are swapped during 2449 sorting. It depends on the qsort implementation if this actually 2450 happens. */ 2451 return r1->bpo_reloc_no > r2->bpo_reloc_no 2452 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0); 2453 } 2454 2455 /* For debug use only. Dumps the global register allocations resulting 2456 from base-plus-offset relocs. */ 2457 2458 void 2459 mmix_dump_bpo_gregs (struct bfd_link_info *link_info, 2460 void (*pf) (const char *fmt, ...)) 2461 { 2462 bfd *bpo_greg_owner; 2463 asection *bpo_gregs_section; 2464 struct bpo_greg_section_info *gregdata; 2465 unsigned int i; 2466 2467 if (link_info == NULL || link_info->base_file == NULL) 2468 return; 2469 2470 bpo_greg_owner = (bfd *) link_info->base_file; 2471 2472 bpo_gregs_section 2473 = bfd_get_section_by_name (bpo_greg_owner, 2474 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2475 2476 if (bpo_gregs_section == NULL) 2477 return; 2478 2479 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2480 if (gregdata == NULL) 2481 return; 2482 2483 if (pf == NULL) 2484 pf = _bfd_error_handler; 2485 2486 /* These format strings are not translated. They are for debug purposes 2487 only and never displayed to an end user. Should they escape, we 2488 surely want them in original. */ 2489 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\ 2490 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs, 2491 gregdata->n_max_bpo_relocs, 2492 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2493 gregdata->n_allocated_bpo_gregs); 2494 2495 if (gregdata->reloc_request) 2496 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2497 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n", 2498 i, 2499 (gregdata->bpo_reloc_indexes != NULL 2500 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1), 2501 gregdata->reloc_request[i].bpo_reloc_no, 2502 gregdata->reloc_request[i].valid, 2503 2504 (unsigned long) (gregdata->reloc_request[i].value >> 32), 2505 (unsigned long) gregdata->reloc_request[i].value, 2506 gregdata->reloc_request[i].regindex, 2507 gregdata->reloc_request[i].offset); 2508 } 2509 2510 /* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and 2511 when the last such reloc is done, an index-array is sorted according to 2512 the values and iterated over to produce register numbers (indexed by 0 2513 from the first allocated register number) and offsets for use in real 2514 relocation. (N.B.: Relocatable runs are handled, not just punted.) 2515 2516 PUSHJ stub accounting is also done here. 2517 2518 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 2519 2520 static bool 2521 mmix_elf_relax_section (bfd *abfd, 2522 asection *sec, 2523 struct bfd_link_info *link_info, 2524 bool *again) 2525 { 2526 Elf_Internal_Shdr *symtab_hdr; 2527 Elf_Internal_Rela *internal_relocs; 2528 Elf_Internal_Rela *irel, *irelend; 2529 asection *bpo_gregs_section = NULL; 2530 struct bpo_greg_section_info *gregdata; 2531 struct bpo_reloc_section_info *bpodata 2532 = mmix_elf_section_data (sec)->bpo.reloc; 2533 /* The initialization is to quiet compiler warnings. The value is to 2534 spot a missing actual initialization. */ 2535 size_t bpono = (size_t) -1; 2536 size_t pjsno = 0; 2537 size_t pjsno_undefs = 0; 2538 Elf_Internal_Sym *isymbuf = NULL; 2539 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size; 2540 2541 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0; 2542 2543 /* Assume nothing changes. */ 2544 *again = false; 2545 2546 /* We don't have to do anything if this section does not have relocs, or 2547 if this is not a code section. */ 2548 if ((sec->flags & SEC_RELOC) == 0 2549 || sec->reloc_count == 0 2550 || (sec->flags & SEC_CODE) == 0 2551 || (sec->flags & SEC_LINKER_CREATED) != 0 2552 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs, 2553 then nothing to do. */ 2554 || (bpodata == NULL 2555 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)) 2556 return true; 2557 2558 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2559 2560 if (bpodata != NULL) 2561 { 2562 bpo_gregs_section = bpodata->bpo_greg_section; 2563 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2564 bpono = bpodata->first_base_plus_offset_reloc; 2565 } 2566 else 2567 gregdata = NULL; 2568 2569 /* Get a copy of the native relocations. */ 2570 internal_relocs 2571 = _bfd_elf_link_read_relocs (abfd, sec, NULL, 2572 (Elf_Internal_Rela *) NULL, 2573 link_info->keep_memory); 2574 if (internal_relocs == NULL) 2575 goto error_return; 2576 2577 /* Walk through them looking for relaxing opportunities. */ 2578 irelend = internal_relocs + sec->reloc_count; 2579 for (irel = internal_relocs; irel < irelend; irel++) 2580 { 2581 bfd_vma symval; 2582 struct elf_link_hash_entry *h = NULL; 2583 2584 /* We only process two relocs. */ 2585 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET 2586 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE) 2587 continue; 2588 2589 /* We process relocs in a distinctly different way when this is a 2590 relocatable link (for one, we don't look at symbols), so we avoid 2591 mixing its code with that for the "normal" relaxation. */ 2592 if (bfd_link_relocatable (link_info)) 2593 { 2594 /* The only transformation in a relocatable link is to generate 2595 a full stub at the location of the stub calculated for the 2596 input section, if the relocated stub location, the end of the 2597 output section plus earlier stubs, cannot be reached. Thus 2598 relocatable linking can only lead to worse code, but it still 2599 works. */ 2600 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE) 2601 { 2602 /* If we can reach the end of the output-section and beyond 2603 any current stubs, then we don't need a stub for this 2604 reloc. The relaxed order of output stub allocation may 2605 not exactly match the straightforward order, so we always 2606 assume presence of output stubs, which will allow 2607 relaxation only on relocations indifferent to the 2608 presence of output stub allocations for other relocations 2609 and thus the order of output stub allocation. */ 2610 if (bfd_check_overflow (complain_overflow_signed, 2611 19, 2612 0, 2613 bfd_arch_bits_per_address (abfd), 2614 /* Output-stub location. */ 2615 sec->output_section->rawsize 2616 + (mmix_elf_section_data (sec 2617 ->output_section) 2618 ->pjs.stubs_size_sum) 2619 /* Location of this PUSHJ reloc. */ 2620 - (sec->output_offset + irel->r_offset) 2621 /* Don't count *this* stub twice. */ 2622 - (mmix_elf_section_data (sec) 2623 ->pjs.stub_size[pjsno] 2624 + MAX_PUSHJ_STUB_SIZE)) 2625 == bfd_reloc_ok) 2626 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2627 2628 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2629 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2630 2631 pjsno++; 2632 } 2633 2634 continue; 2635 } 2636 2637 /* Get the value of the symbol referred to by the reloc. */ 2638 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2639 { 2640 /* A local symbol. */ 2641 Elf_Internal_Sym *isym; 2642 asection *sym_sec; 2643 2644 /* Read this BFD's local symbols if we haven't already. */ 2645 if (isymbuf == NULL) 2646 { 2647 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2648 if (isymbuf == NULL) 2649 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2650 symtab_hdr->sh_info, 0, 2651 NULL, NULL, NULL); 2652 if (isymbuf == 0) 2653 goto error_return; 2654 } 2655 2656 isym = isymbuf + ELF64_R_SYM (irel->r_info); 2657 if (isym->st_shndx == SHN_UNDEF) 2658 sym_sec = bfd_und_section_ptr; 2659 else if (isym->st_shndx == SHN_ABS) 2660 sym_sec = bfd_abs_section_ptr; 2661 else if (isym->st_shndx == SHN_COMMON) 2662 sym_sec = bfd_com_section_ptr; 2663 else 2664 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2665 symval = (isym->st_value 2666 + sym_sec->output_section->vma 2667 + sym_sec->output_offset); 2668 } 2669 else 2670 { 2671 unsigned long indx; 2672 2673 /* An external symbol. */ 2674 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2675 h = elf_sym_hashes (abfd)[indx]; 2676 BFD_ASSERT (h != NULL); 2677 if (h->root.type == bfd_link_hash_undefweak) 2678 /* FIXME: for R_MMIX_PUSHJ_STUBBABLE, there are alternatives to 2679 the canonical value 0 for an unresolved weak symbol to 2680 consider: as the debug-friendly approach, resolve to "abort" 2681 (or a port-specific function), or as the space-friendly 2682 approach resolve to the next instruction (like some other 2683 ports, notably ARM and AArch64). These alternatives require 2684 matching code in mmix_elf_perform_relocation or its caller. */ 2685 symval = 0; 2686 else if (h->root.type == bfd_link_hash_defined 2687 || h->root.type == bfd_link_hash_defweak) 2688 symval = (h->root.u.def.value 2689 + h->root.u.def.section->output_section->vma 2690 + h->root.u.def.section->output_offset); 2691 else 2692 { 2693 /* This appears to be a reference to an undefined symbol. Just 2694 ignore it--it will be caught by the regular reloc processing. 2695 We need to keep BPO reloc accounting consistent, though 2696 else we'll abort instead of emitting an error message. */ 2697 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET 2698 && gregdata != NULL) 2699 { 2700 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2701 bpono++; 2702 } 2703 2704 /* Similarly, keep accounting consistent for PUSHJ 2705 referring to an undefined symbol. */ 2706 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE) 2707 pjsno_undefs++; 2708 continue; 2709 } 2710 } 2711 2712 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE) 2713 { 2714 bfd_vma value = symval + irel->r_addend; 2715 bfd_vma dot 2716 = (sec->output_section->vma 2717 + sec->output_offset 2718 + irel->r_offset); 2719 bfd_vma stubaddr 2720 = (sec->output_section->vma 2721 + sec->output_offset 2722 + size 2723 + mmix_elf_section_data (sec)->pjs.stubs_size_sum); 2724 2725 if ((value & 3) == 0 2726 && bfd_check_overflow (complain_overflow_signed, 2727 19, 2728 0, 2729 bfd_arch_bits_per_address (abfd), 2730 value - dot 2731 - (value > dot 2732 ? mmix_elf_section_data (sec) 2733 ->pjs.stub_size[pjsno] 2734 : 0)) 2735 == bfd_reloc_ok) 2736 /* If the reloc fits, no stub is needed. */ 2737 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2738 else 2739 /* Maybe we can get away with just a JMP insn? */ 2740 if ((value & 3) == 0 2741 && bfd_check_overflow (complain_overflow_signed, 2742 27, 2743 0, 2744 bfd_arch_bits_per_address (abfd), 2745 value - stubaddr 2746 - (value > dot 2747 ? mmix_elf_section_data (sec) 2748 ->pjs.stub_size[pjsno] - 4 2749 : 0)) 2750 == bfd_reloc_ok) 2751 /* Yep, account for a stub consisting of a single JMP insn. */ 2752 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4; 2753 else 2754 /* Nope, go for the full insn stub. It doesn't seem useful to 2755 emit the intermediate sizes; those will only be useful for 2756 a >64M program assuming contiguous code. */ 2757 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] 2758 = MAX_PUSHJ_STUB_SIZE; 2759 2760 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2761 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2762 pjsno++; 2763 continue; 2764 } 2765 2766 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */ 2767 2768 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value 2769 = symval + irel->r_addend; 2770 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = true; 2771 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2772 } 2773 2774 /* Check if that was the last BPO-reloc. If so, sort the values and 2775 calculate how many registers we need to cover them. Set the size of 2776 the linker gregs, and if the number of registers changed, indicate 2777 that we need to relax some more because we have more work to do. */ 2778 if (gregdata != NULL 2779 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0) 2780 { 2781 size_t i; 2782 bfd_vma prev_base; 2783 size_t regindex; 2784 2785 /* First, reset the remaining relocs for the next round. */ 2786 gregdata->n_remaining_bpo_relocs_this_relaxation_round 2787 = gregdata->n_bpo_relocs; 2788 2789 qsort (gregdata->reloc_request, 2790 gregdata->n_max_bpo_relocs, 2791 sizeof (struct bpo_reloc_request), 2792 bpo_reloc_request_sort_fn); 2793 2794 /* Recalculate indexes. When we find a change (however unlikely 2795 after the initial iteration), we know we need to relax again, 2796 since items in the GREG-array are sorted by increasing value and 2797 stored in the relaxation phase. */ 2798 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2799 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2800 != i) 2801 { 2802 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2803 = i; 2804 *again = true; 2805 } 2806 2807 /* Allocate register numbers (indexing from 0). Stop at the first 2808 non-valid reloc. */ 2809 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value; 2810 i < gregdata->n_bpo_relocs; 2811 i++) 2812 { 2813 if (gregdata->reloc_request[i].value > prev_base + 255) 2814 { 2815 regindex++; 2816 prev_base = gregdata->reloc_request[i].value; 2817 } 2818 gregdata->reloc_request[i].regindex = regindex; 2819 gregdata->reloc_request[i].offset 2820 = gregdata->reloc_request[i].value - prev_base; 2821 } 2822 2823 /* If it's not the same as the last time, we need to relax again, 2824 because the size of the section has changed. I'm not sure we 2825 actually need to do any adjustments since the shrinking happens 2826 at the start of this section, but better safe than sorry. */ 2827 if (gregdata->n_allocated_bpo_gregs != regindex + 1) 2828 { 2829 gregdata->n_allocated_bpo_gregs = regindex + 1; 2830 *again = true; 2831 } 2832 2833 bpo_gregs_section->size = (regindex + 1) * 8; 2834 } 2835 2836 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2837 { 2838 if (! link_info->keep_memory) 2839 free (isymbuf); 2840 else 2841 { 2842 /* Cache the symbols for elf_link_input_bfd. */ 2843 symtab_hdr->contents = (unsigned char *) isymbuf; 2844 } 2845 } 2846 2847 BFD_ASSERT(pjsno + pjsno_undefs 2848 == mmix_elf_section_data (sec)->pjs.n_pushj_relocs); 2849 2850 if (elf_section_data (sec)->relocs != internal_relocs) 2851 free (internal_relocs); 2852 2853 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2854 abort (); 2855 2856 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2857 { 2858 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum; 2859 *again = true; 2860 } 2861 2862 return true; 2863 2864 error_return: 2865 if ((unsigned char *) isymbuf != symtab_hdr->contents) 2866 free (isymbuf); 2867 if (elf_section_data (sec)->relocs != internal_relocs) 2868 free (internal_relocs); 2869 return false; 2870 } 2871 2872 #define ELF_ARCH bfd_arch_mmix 2874 #define ELF_MACHINE_CODE EM_MMIX 2875 2876 /* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL). 2877 However, that's too much for something somewhere in the linker part of 2878 BFD; perhaps the start-address has to be a non-zero multiple of this 2879 number, or larger than this number. The symptom is that the linker 2880 complains: "warning: allocated section `.text' not in segment". We 2881 settle for 64k; the page-size used in examples is 8k. 2882 #define ELF_MAXPAGESIZE 0x10000 2883 2884 Unfortunately, this causes excessive padding in the supposedly small 2885 for-education programs that are the expected usage (where people would 2886 inspect output). We stick to 256 bytes just to have *some* default 2887 alignment. */ 2888 #define ELF_MAXPAGESIZE 0x100 2889 2890 #define TARGET_BIG_SYM mmix_elf64_vec 2891 #define TARGET_BIG_NAME "elf64-mmix" 2892 2893 #define elf_info_to_howto_rel NULL 2894 #define elf_info_to_howto mmix_info_to_howto_rela 2895 #define elf_backend_relocate_section mmix_elf_relocate_section 2896 #define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook 2897 2898 #define elf_backend_link_output_symbol_hook \ 2899 mmix_elf_link_output_symbol_hook 2900 #define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook 2901 2902 #define elf_backend_check_relocs mmix_elf_check_relocs 2903 #define elf_backend_symbol_processing mmix_elf_symbol_processing 2904 #define elf_backend_omit_section_dynsym _bfd_elf_omit_section_dynsym_all 2905 2906 #define bfd_elf64_bfd_copy_link_hash_symbol_type \ 2907 _bfd_generic_copy_link_hash_symbol_type 2908 2909 #define bfd_elf64_bfd_is_local_label_name \ 2910 mmix_elf_is_local_label_name 2911 2912 #define elf_backend_may_use_rel_p 0 2913 #define elf_backend_may_use_rela_p 1 2914 #define elf_backend_default_use_rela_p 1 2915 2916 #define elf_backend_can_gc_sections 1 2917 #define elf_backend_section_from_bfd_section \ 2918 mmix_elf_section_from_bfd_section 2919 2920 #define bfd_elf64_new_section_hook mmix_elf_new_section_hook 2921 #define bfd_elf64_bfd_final_link mmix_elf_final_link 2922 #define bfd_elf64_bfd_relax_section mmix_elf_relax_section 2923 2924 #include "elf64-target.h" 2925
Indexes created Fri May 01 00:23:41 UTC 2026