elf64-mmix.c revision 1.1.1.12
1 /* MMIX-specific support for 64-bit ELF. 2 Copyright (C) 2001-2026 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 struct _mmix_elf_section_data *sdata; 832 833 sdata = bfd_zalloc (abfd, sizeof (*sdata)); 834 if (sdata == NULL) 835 return false; 836 sec->used_by_bfd = sdata; 837 838 return _bfd_elf_new_section_hook (abfd, sec); 839 } 840 841 842 /* This function performs the actual bitfiddling and sanity check for a 843 final relocation. Each relocation gets its *worst*-case expansion 844 in size when it arrives here; any reduction in size should have been 845 caught in linker relaxation earlier. When we get here, the relocation 846 looks like the smallest instruction with SWYM:s (nop:s) appended to the 847 max size. We fill in those nop:s. 848 849 R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra) 850 GETA $N,foo 851 -> 852 SETL $N,foo & 0xffff 853 INCML $N,(foo >> 16) & 0xffff 854 INCMH $N,(foo >> 32) & 0xffff 855 INCH $N,(foo >> 48) & 0xffff 856 857 R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but 858 condbranches needing relaxation might be rare enough to not be 859 worthwhile.) 860 [P]Bcc $N,foo 861 -> 862 [~P]B~cc $N,.+20 863 SETL $255,foo & ... 864 INCML ... 865 INCMH ... 866 INCH ... 867 GO $255,$255,0 868 869 R_MMIX_PUSHJ: (FIXME: Relaxation...) 870 PUSHJ $N,foo 871 -> 872 SETL $255,foo & ... 873 INCML ... 874 INCMH ... 875 INCH ... 876 PUSHGO $N,$255,0 877 878 R_MMIX_JMP: (FIXME: Relaxation...) 879 JMP foo 880 -> 881 SETL $255,foo & ... 882 INCML ... 883 INCMH ... 884 INCH ... 885 GO $255,$255,0 886 887 R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */ 888 889 static bfd_reloc_status_type 890 mmix_elf_perform_relocation (asection *isec, reloc_howto_type *howto, 891 void *datap, bfd_vma addr, bfd_vma value, 892 char **error_message) 893 { 894 bfd *abfd = isec->owner; 895 bfd_reloc_status_type flag = bfd_reloc_ok; 896 bfd_reloc_status_type r; 897 int offs = 0; 898 int reg = 255; 899 900 /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences. 901 We handle the differences here and the common sequence later. */ 902 switch (howto->type) 903 { 904 case R_MMIX_GETA: 905 offs = 0; 906 reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 907 908 /* We change to an absolute value. */ 909 value += addr; 910 break; 911 912 case R_MMIX_CBRANCH: 913 { 914 int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16; 915 916 /* Invert the condition and prediction bit, and set the offset 917 to five instructions ahead. 918 919 We *can* do better if we want to. If the branch is found to be 920 within limits, we could leave the branch as is; there'll just 921 be a bunch of NOP:s after it. But we shouldn't see this 922 sequence often enough that it's worth doing it. */ 923 924 bfd_put_32 (abfd, 925 (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff) 926 | (24/4)), 927 (bfd_byte *) datap); 928 929 /* Put a "GO $255,$255,0" after the common sequence. */ 930 bfd_put_32 (abfd, 931 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00, 932 (bfd_byte *) datap + 20); 933 934 /* Common sequence starts at offset 4. */ 935 offs = 4; 936 937 /* We change to an absolute value. */ 938 value += addr; 939 } 940 break; 941 942 case R_MMIX_PUSHJ_STUBBABLE: 943 /* If the address fits, we're fine. */ 944 if ((value & 3) == 0 945 /* Note rightshift 0; see R_MMIX_JMP case below. */ 946 && (r = bfd_check_overflow (complain_overflow_signed, 947 howto->bitsize, 948 0, 949 bfd_arch_bits_per_address (abfd), 950 value)) == bfd_reloc_ok) 951 goto pcrel_mmix_reloc_fits; 952 else 953 { 954 bfd_size_type size = isec->rawsize ? isec->rawsize : isec->size; 955 956 /* We have the bytes at the PUSHJ insn and need to get the 957 position for the stub. There's supposed to be room allocated 958 for the stub. */ 959 bfd_byte *stubcontents 960 = ((bfd_byte *) datap 961 - (addr - (isec->output_section->vma + isec->output_offset)) 962 + size 963 + mmix_elf_section_data (isec)->pjs.stub_offset); 964 bfd_vma stubaddr; 965 966 if (mmix_elf_section_data (isec)->pjs.n_pushj_relocs == 0) 967 { 968 /* This shouldn't happen when linking to ELF or mmo, so 969 this is an attempt to link to "binary", right? We 970 can't access the output bfd, so we can't verify that 971 assumption. We only know that the critical 972 mmix_elf_check_common_relocs has not been called, 973 which happens when the output format is different 974 from the input format (and is not mmo). */ 975 if (! mmix_elf_section_data (isec)->has_warned_pushj) 976 { 977 /* For the first such error per input section, produce 978 a verbose message. */ 979 *error_message 980 = _("invalid input relocation when producing" 981 " non-ELF, non-mmo format output;" 982 " please use the objcopy program to convert from" 983 " ELF or mmo," 984 " or assemble using" 985 " \"-no-expand\" (for gcc, \"-Wa,-no-expand\""); 986 mmix_elf_section_data (isec)->has_warned_pushj = true; 987 return bfd_reloc_dangerous; 988 } 989 990 /* For subsequent errors, return this one, which is 991 rate-limited but looks a little bit different, 992 hopefully without affecting user-friendliness. */ 993 return bfd_reloc_overflow; 994 } 995 996 /* The address doesn't fit, so redirect the PUSHJ to the 997 location of the stub. */ 998 r = mmix_elf_perform_relocation (isec, 999 &elf_mmix_howto_table 1000 [R_MMIX_ADDR19], 1001 datap, 1002 addr, 1003 isec->output_section->vma 1004 + isec->output_offset 1005 + size 1006 + (mmix_elf_section_data (isec) 1007 ->pjs.stub_offset) 1008 - addr, 1009 error_message); 1010 if (r != bfd_reloc_ok) 1011 return r; 1012 1013 stubaddr 1014 = (isec->output_section->vma 1015 + isec->output_offset 1016 + size 1017 + mmix_elf_section_data (isec)->pjs.stub_offset); 1018 1019 /* We generate a simple JMP if that suffices, else the whole 5 1020 insn stub. */ 1021 if (bfd_check_overflow (complain_overflow_signed, 1022 elf_mmix_howto_table[R_MMIX_ADDR27].bitsize, 1023 0, 1024 bfd_arch_bits_per_address (abfd), 1025 addr + value - stubaddr) == bfd_reloc_ok) 1026 { 1027 bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents); 1028 r = mmix_elf_perform_relocation (isec, 1029 &elf_mmix_howto_table 1030 [R_MMIX_ADDR27], 1031 stubcontents, 1032 stubaddr, 1033 value + addr - stubaddr, 1034 error_message); 1035 mmix_elf_section_data (isec)->pjs.stub_offset += 4; 1036 1037 if (size + mmix_elf_section_data (isec)->pjs.stub_offset 1038 > isec->size) 1039 abort (); 1040 1041 return r; 1042 } 1043 else 1044 { 1045 /* Put a "GO $255,0" after the common sequence. */ 1046 bfd_put_32 (abfd, 1047 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1048 | 0xff00, (bfd_byte *) stubcontents + 16); 1049 1050 /* Prepare for the general code to set the first part of the 1051 linker stub, and */ 1052 value += addr; 1053 datap = stubcontents; 1054 mmix_elf_section_data (isec)->pjs.stub_offset 1055 += MAX_PUSHJ_STUB_SIZE; 1056 } 1057 } 1058 break; 1059 1060 case R_MMIX_PUSHJ: 1061 { 1062 int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 1063 1064 /* Put a "PUSHGO $N,$255,0" after the common sequence. */ 1065 bfd_put_32 (abfd, 1066 ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1067 | (inreg << 16) 1068 | 0xff00, 1069 (bfd_byte *) datap + 16); 1070 1071 /* We change to an absolute value. */ 1072 value += addr; 1073 } 1074 break; 1075 1076 case R_MMIX_JMP: 1077 /* This one is a little special. If we get here on a non-relaxing 1078 link, and the destination is actually in range, we don't need to 1079 execute the nops. 1080 If so, we fall through to the bit-fiddling relocs. 1081 1082 FIXME: bfd_check_overflow seems broken; the relocation is 1083 rightshifted before testing, so supply a zero rightshift. */ 1084 1085 if (! ((value & 3) == 0 1086 && (r = bfd_check_overflow (complain_overflow_signed, 1087 howto->bitsize, 1088 0, 1089 bfd_arch_bits_per_address (abfd), 1090 value)) == bfd_reloc_ok)) 1091 { 1092 /* If the relocation doesn't fit in a JMP, we let the NOP:s be 1093 modified below, and put a "GO $255,$255,0" after the 1094 address-loading sequence. */ 1095 bfd_put_32 (abfd, 1096 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1097 | 0xffff00, 1098 (bfd_byte *) datap + 16); 1099 1100 /* We change to an absolute value. */ 1101 value += addr; 1102 break; 1103 } 1104 /* FALLTHROUGH. */ 1105 case R_MMIX_ADDR19: 1106 case R_MMIX_ADDR27: 1107 pcrel_mmix_reloc_fits: 1108 /* These must be in range, or else we emit an error. */ 1109 if ((value & 3) == 0 1110 /* Note rightshift 0; see above. */ 1111 && (r = bfd_check_overflow (complain_overflow_signed, 1112 howto->bitsize, 1113 0, 1114 bfd_arch_bits_per_address (abfd), 1115 value)) == bfd_reloc_ok) 1116 { 1117 bfd_vma in1 1118 = bfd_get_32 (abfd, (bfd_byte *) datap); 1119 bfd_vma highbit; 1120 1121 if ((bfd_signed_vma) value < 0) 1122 { 1123 highbit = 1 << 24; 1124 value += (1 << (howto->bitsize - 1)); 1125 } 1126 else 1127 highbit = 0; 1128 1129 value >>= 2; 1130 1131 bfd_put_32 (abfd, 1132 (in1 & howto->src_mask) 1133 | highbit 1134 | (value & howto->dst_mask), 1135 (bfd_byte *) datap); 1136 1137 return bfd_reloc_ok; 1138 } 1139 else 1140 return bfd_reloc_overflow; 1141 1142 case R_MMIX_BASE_PLUS_OFFSET: 1143 { 1144 struct bpo_reloc_section_info *bpodata 1145 = mmix_elf_section_data (isec)->bpo.reloc; 1146 asection *bpo_greg_section; 1147 struct bpo_greg_section_info *gregdata; 1148 size_t bpo_index; 1149 1150 if (bpodata == NULL) 1151 { 1152 /* This shouldn't happen when linking to ELF or mmo, so 1153 this is an attempt to link to "binary", right? We 1154 can't access the output bfd, so we can't verify that 1155 assumption. We only know that the critical 1156 mmix_elf_check_common_relocs has not been called, which 1157 happens when the output format is different from the 1158 input format (and is not mmo). */ 1159 if (! mmix_elf_section_data (isec)->has_warned_bpo) 1160 { 1161 /* For the first such error per input section, produce 1162 a verbose message. */ 1163 *error_message 1164 = _("invalid input relocation when producing" 1165 " non-ELF, non-mmo format output;" 1166 " please use the objcopy program to convert from" 1167 " ELF or mmo," 1168 " or compile using the gcc-option" 1169 " \"-mno-base-addresses\"."); 1170 mmix_elf_section_data (isec)->has_warned_bpo = true; 1171 return bfd_reloc_dangerous; 1172 } 1173 1174 /* For subsequent errors, return this one, which is 1175 rate-limited but looks a little bit different, 1176 hopefully without affecting user-friendliness. */ 1177 return bfd_reloc_overflow; 1178 } 1179 1180 bpo_greg_section = bpodata->bpo_greg_section; 1181 gregdata = mmix_elf_section_data (bpo_greg_section)->bpo.greg; 1182 bpo_index = gregdata->bpo_reloc_indexes[bpodata->bpo_index++]; 1183 1184 /* A consistency check: The value we now have in "relocation" must 1185 be the same as the value we stored for that relocation. It 1186 doesn't cost much, so can be left in at all times. */ 1187 if (value != gregdata->reloc_request[bpo_index].value) 1188 { 1189 _bfd_error_handler 1190 /* xgettext:c-format */ 1191 (_("%pB: Internal inconsistency error for value for\n\ 1192 linker-allocated global register: linked: %#" PRIx64 " != relaxed: %#" PRIx64 ""), 1193 isec->owner, 1194 (uint64_t) value, 1195 (uint64_t) gregdata->reloc_request[bpo_index].value); 1196 bfd_set_error (bfd_error_bad_value); 1197 return bfd_reloc_overflow; 1198 } 1199 1200 /* Then store the register number and offset for that register 1201 into datap and datap + 1 respectively. */ 1202 bfd_put_8 (abfd, 1203 gregdata->reloc_request[bpo_index].regindex 1204 + bpo_greg_section->output_section->vma / 8, 1205 datap); 1206 bfd_put_8 (abfd, 1207 gregdata->reloc_request[bpo_index].offset, 1208 ((unsigned char *) datap) + 1); 1209 return bfd_reloc_ok; 1210 } 1211 1212 case R_MMIX_REG_OR_BYTE: 1213 case R_MMIX_REG: 1214 if (value > 255) 1215 return bfd_reloc_overflow; 1216 bfd_put_8 (abfd, value, datap); 1217 return bfd_reloc_ok; 1218 1219 default: 1220 BAD_CASE (howto->type); 1221 } 1222 1223 /* This code adds the common SETL/INCML/INCMH/INCH worst-case 1224 sequence. */ 1225 1226 /* Lowest two bits must be 0. We return bfd_reloc_overflow for 1227 everything that looks strange. */ 1228 if (value & 3) 1229 flag = bfd_reloc_overflow; 1230 1231 bfd_put_32 (abfd, 1232 (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16), 1233 (bfd_byte *) datap + offs); 1234 bfd_put_32 (abfd, 1235 (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16), 1236 (bfd_byte *) datap + offs + 4); 1237 bfd_put_32 (abfd, 1238 (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16), 1239 (bfd_byte *) datap + offs + 8); 1240 bfd_put_32 (abfd, 1241 (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16), 1242 (bfd_byte *) datap + offs + 12); 1243 1244 return flag; 1245 } 1246 1247 /* Set the howto pointer for an MMIX ELF reloc (type RELA). */ 1248 1249 static bool 1250 mmix_info_to_howto_rela (bfd *abfd, 1251 arelent *cache_ptr, 1252 Elf_Internal_Rela *dst) 1253 { 1254 unsigned int r_type; 1255 1256 r_type = ELF64_R_TYPE (dst->r_info); 1257 if (r_type >= (unsigned int) R_MMIX_max) 1258 { 1259 /* xgettext:c-format */ 1260 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 1261 abfd, r_type); 1262 bfd_set_error (bfd_error_bad_value); 1263 return false; 1264 } 1265 cache_ptr->howto = &elf_mmix_howto_table[r_type]; 1266 return true; 1267 } 1268 1269 /* Any MMIX-specific relocation gets here at assembly time or when linking 1270 to other formats (such as mmo); this is the relocation function from 1271 the reloc_table. We don't get here for final pure ELF linking. */ 1272 1273 static bfd_reloc_status_type 1274 mmix_elf_reloc (bfd *abfd, 1275 arelent *reloc_entry, 1276 asymbol *symbol, 1277 void * data, 1278 asection *input_section, 1279 bfd *output_bfd, 1280 char **error_message) 1281 { 1282 bfd_vma relocation; 1283 bfd_reloc_status_type r; 1284 asection *reloc_target_output_section; 1285 bfd_reloc_status_type flag = bfd_reloc_ok; 1286 bfd_vma output_base = 0; 1287 1288 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 1289 input_section, output_bfd, error_message); 1290 1291 /* If that was all that was needed (i.e. this isn't a final link, only 1292 some segment adjustments), we're done. */ 1293 if (r != bfd_reloc_continue) 1294 return r; 1295 1296 if (bfd_is_und_section (symbol->section) 1297 && (symbol->flags & BSF_WEAK) == 0 1298 && output_bfd == (bfd *) NULL) 1299 return bfd_reloc_undefined; 1300 1301 /* Is the address of the relocation really within the section? */ 1302 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 1303 return bfd_reloc_outofrange; 1304 1305 /* Work out which section the relocation is targeted at and the 1306 initial relocation command value. */ 1307 1308 /* Get symbol value. (Common symbols are special.) */ 1309 if (bfd_is_com_section (symbol->section)) 1310 relocation = 0; 1311 else 1312 relocation = symbol->value; 1313 1314 reloc_target_output_section = bfd_asymbol_section (symbol)->output_section; 1315 1316 /* Here the variable relocation holds the final address of the symbol we 1317 are relocating against, plus any addend. */ 1318 if (output_bfd) 1319 output_base = 0; 1320 else 1321 output_base = reloc_target_output_section->vma; 1322 1323 relocation += output_base + symbol->section->output_offset; 1324 1325 if (output_bfd != (bfd *) NULL) 1326 { 1327 /* Add in supplied addend. */ 1328 relocation += reloc_entry->addend; 1329 1330 /* This is a partial relocation, and we want to apply the 1331 relocation to the reloc entry rather than the raw data. 1332 Modify the reloc inplace to reflect what we now know. */ 1333 reloc_entry->addend = relocation; 1334 reloc_entry->address += input_section->output_offset; 1335 return flag; 1336 } 1337 1338 return mmix_final_link_relocate (reloc_entry->howto, input_section, 1339 data, reloc_entry->address, 1340 reloc_entry->addend, relocation, 1341 bfd_asymbol_name (symbol), 1342 reloc_target_output_section, 1343 error_message); 1344 } 1345 1346 /* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it 1348 for guidance if you're thinking of copying this. */ 1349 1350 static int 1351 mmix_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, 1352 struct bfd_link_info *info, 1353 bfd *input_bfd, 1354 asection *input_section, 1355 bfd_byte *contents, 1356 Elf_Internal_Rela *relocs, 1357 Elf_Internal_Sym *local_syms, 1358 asection **local_sections) 1359 { 1360 Elf_Internal_Shdr *symtab_hdr; 1361 struct elf_link_hash_entry **sym_hashes; 1362 Elf_Internal_Rela *rel; 1363 Elf_Internal_Rela *relend; 1364 bfd_size_type size; 1365 size_t pjsno = 0; 1366 1367 size = input_section->rawsize ? input_section->rawsize : input_section->size; 1368 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1369 sym_hashes = elf_sym_hashes (input_bfd); 1370 relend = relocs + input_section->reloc_count; 1371 1372 /* Zero the stub area before we start. */ 1373 if (input_section->rawsize != 0 1374 && input_section->size > input_section->rawsize) 1375 memset (contents + input_section->rawsize, 0, 1376 input_section->size - input_section->rawsize); 1377 1378 for (rel = relocs; rel < relend; rel ++) 1379 { 1380 reloc_howto_type *howto; 1381 unsigned long r_symndx; 1382 Elf_Internal_Sym *sym; 1383 asection *sec; 1384 struct elf_link_hash_entry *h; 1385 bfd_vma relocation; 1386 bfd_reloc_status_type r; 1387 const char *name = NULL; 1388 int r_type; 1389 bool undefined_signalled = false; 1390 1391 r_type = ELF64_R_TYPE (rel->r_info); 1392 1393 if (r_type == R_MMIX_GNU_VTINHERIT 1394 || r_type == R_MMIX_GNU_VTENTRY) 1395 continue; 1396 1397 r_symndx = ELF64_R_SYM (rel->r_info); 1398 1399 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info); 1400 h = NULL; 1401 sym = NULL; 1402 sec = NULL; 1403 1404 if (r_symndx < symtab_hdr->sh_info) 1405 { 1406 sym = local_syms + r_symndx; 1407 sec = local_sections [r_symndx]; 1408 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1409 1410 name = bfd_elf_string_from_elf_section (input_bfd, 1411 symtab_hdr->sh_link, 1412 sym->st_name); 1413 if (name == NULL) 1414 name = bfd_section_name (sec); 1415 } 1416 else 1417 { 1418 bool unresolved_reloc, ignored; 1419 1420 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1421 r_symndx, symtab_hdr, sym_hashes, 1422 h, sec, relocation, 1423 unresolved_reloc, undefined_signalled, 1424 ignored); 1425 name = h->root.root.string; 1426 } 1427 1428 if (sec != NULL && discarded_section (sec)) 1429 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1430 rel, 1, relend, R_MMIX_NONE, 1431 howto, 0, contents); 1432 1433 if (bfd_link_relocatable (info)) 1434 { 1435 /* This is a relocatable link. For most relocs we don't have to 1436 change anything, unless the reloc is against a section 1437 symbol, in which case we have to adjust according to where 1438 the section symbol winds up in the output section. */ 1439 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 1440 rel->r_addend += sec->output_offset; 1441 1442 /* For PUSHJ stub relocs however, we may need to change the 1443 reloc and the section contents, if the reloc doesn't reach 1444 beyond the end of the output section and previous stubs. 1445 Then we change the section contents to be a PUSHJ to the end 1446 of the input section plus stubs (we can do that without using 1447 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ 1448 at the stub location. */ 1449 if (r_type == R_MMIX_PUSHJ_STUBBABLE) 1450 { 1451 /* We've already checked whether we need a stub; use that 1452 knowledge. */ 1453 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno] 1454 != 0) 1455 { 1456 Elf_Internal_Rela relcpy; 1457 1458 if (mmix_elf_section_data (input_section) 1459 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE) 1460 abort (); 1461 1462 /* There's already a PUSHJ insn there, so just fill in 1463 the offset bits to the stub. */ 1464 if (mmix_final_link_relocate (elf_mmix_howto_table 1465 + R_MMIX_ADDR19, 1466 input_section, 1467 contents, 1468 rel->r_offset, 1469 0, 1470 input_section 1471 ->output_section->vma 1472 + input_section->output_offset 1473 + size 1474 + mmix_elf_section_data (input_section) 1475 ->pjs.stub_offset, 1476 NULL, NULL, NULL) != bfd_reloc_ok) 1477 return false; 1478 1479 /* Put a JMP insn at the stub; it goes with the 1480 R_MMIX_JMP reloc. */ 1481 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24, 1482 contents 1483 + size 1484 + mmix_elf_section_data (input_section) 1485 ->pjs.stub_offset); 1486 1487 /* Change the reloc to be at the stub, and to a full 1488 R_MMIX_JMP reloc. */ 1489 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP); 1490 rel->r_offset 1491 = (size 1492 + mmix_elf_section_data (input_section) 1493 ->pjs.stub_offset); 1494 1495 mmix_elf_section_data (input_section)->pjs.stub_offset 1496 += MAX_PUSHJ_STUB_SIZE; 1497 1498 /* Shift this reloc to the end of the relocs to maintain 1499 the r_offset sorted reloc order. */ 1500 relcpy = *rel; 1501 memmove (rel, rel + 1, (char *) relend - (char *) (rel + 1)); 1502 relend[-1] = relcpy; 1503 1504 /* Back up one reloc, or else we'd skip the next reloc 1505 in turn. */ 1506 rel--; 1507 } 1508 1509 pjsno++; 1510 } 1511 continue; 1512 } 1513 1514 r = mmix_final_link_relocate (howto, input_section, 1515 contents, rel->r_offset, 1516 rel->r_addend, relocation, name, sec, NULL); 1517 1518 if (r != bfd_reloc_ok) 1519 { 1520 const char * msg = (const char *) NULL; 1521 1522 switch (r) 1523 { 1524 case bfd_reloc_overflow: 1525 info->callbacks->reloc_overflow 1526 (info, (h ? &h->root : NULL), name, howto->name, 1527 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1528 break; 1529 1530 case bfd_reloc_undefined: 1531 /* We may have sent this message above. */ 1532 if (! undefined_signalled) 1533 info->callbacks->undefined_symbol 1534 (info, name, input_bfd, input_section, rel->r_offset, true); 1535 undefined_signalled = true; 1536 break; 1537 1538 case bfd_reloc_outofrange: 1539 msg = _("internal error: out of range error"); 1540 break; 1541 1542 case bfd_reloc_notsupported: 1543 msg = _("internal error: unsupported relocation error"); 1544 break; 1545 1546 case bfd_reloc_dangerous: 1547 msg = _("internal error: dangerous relocation"); 1548 break; 1549 1550 default: 1551 msg = _("internal error: unknown error"); 1552 break; 1553 } 1554 1555 if (msg) 1556 (*info->callbacks->warning) (info, msg, name, input_bfd, 1557 input_section, rel->r_offset); 1558 } 1559 } 1560 1561 return true; 1562 } 1563 1564 /* Perform a single relocation. By default we use the standard BFD 1566 routines. A few relocs we have to do ourselves. */ 1567 1568 static bfd_reloc_status_type 1569 mmix_final_link_relocate (reloc_howto_type *howto, asection *input_section, 1570 bfd_byte *contents, bfd_vma r_offset, 1571 bfd_signed_vma r_addend, bfd_vma relocation, 1572 const char *symname, asection *symsec, 1573 char **error_message) 1574 { 1575 bfd_reloc_status_type r = bfd_reloc_ok; 1576 bfd_vma addr 1577 = (input_section->output_section->vma 1578 + input_section->output_offset 1579 + r_offset); 1580 bfd_signed_vma srel 1581 = (bfd_signed_vma) relocation + r_addend; 1582 1583 switch (howto->type) 1584 { 1585 /* All these are PC-relative. */ 1586 case R_MMIX_PUSHJ_STUBBABLE: 1587 case R_MMIX_PUSHJ: 1588 case R_MMIX_CBRANCH: 1589 case R_MMIX_ADDR19: 1590 case R_MMIX_GETA: 1591 case R_MMIX_ADDR27: 1592 case R_MMIX_JMP: 1593 contents += r_offset; 1594 1595 srel -= (input_section->output_section->vma 1596 + input_section->output_offset 1597 + r_offset); 1598 1599 r = mmix_elf_perform_relocation (input_section, howto, contents, 1600 addr, srel, error_message); 1601 break; 1602 1603 case R_MMIX_BASE_PLUS_OFFSET: 1604 if (symsec == NULL) 1605 return bfd_reloc_undefined; 1606 1607 /* Check that we're not relocating against a register symbol. */ 1608 if (strcmp (bfd_section_name (symsec), 1609 MMIX_REG_CONTENTS_SECTION_NAME) == 0 1610 || strcmp (bfd_section_name (symsec), 1611 MMIX_REG_SECTION_NAME) == 0) 1612 { 1613 /* Note: This is separated out into two messages in order 1614 to ease the translation into other languages. */ 1615 if (symname == NULL || *symname == 0) 1616 _bfd_error_handler 1617 /* xgettext:c-format */ 1618 (_("%pB: base-plus-offset relocation against register symbol:" 1619 " (unknown) in %pA"), 1620 input_section->owner, symsec); 1621 else 1622 _bfd_error_handler 1623 /* xgettext:c-format */ 1624 (_("%pB: base-plus-offset relocation against register symbol:" 1625 " %s in %pA"), 1626 input_section->owner, symname, symsec); 1627 return bfd_reloc_overflow; 1628 } 1629 goto do_mmix_reloc; 1630 1631 case R_MMIX_REG_OR_BYTE: 1632 case R_MMIX_REG: 1633 /* For now, we handle these alike. They must refer to an register 1634 symbol, which is either relative to the register section and in 1635 the range 0..255, or is in the register contents section with vma 1636 regno * 8. */ 1637 1638 /* FIXME: A better way to check for reg contents section? 1639 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */ 1640 if (symsec == NULL) 1641 return bfd_reloc_undefined; 1642 1643 if (strcmp (bfd_section_name (symsec), 1644 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1645 { 1646 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1647 { 1648 /* The bfd_reloc_outofrange return value, though intuitively 1649 a better value, will not get us an error. */ 1650 return bfd_reloc_overflow; 1651 } 1652 srel /= 8; 1653 } 1654 else if (strcmp (bfd_section_name (symsec), 1655 MMIX_REG_SECTION_NAME) == 0) 1656 { 1657 if (srel < 0 || srel > 255) 1658 /* The bfd_reloc_outofrange return value, though intuitively a 1659 better value, will not get us an error. */ 1660 return bfd_reloc_overflow; 1661 } 1662 else 1663 { 1664 /* Note: This is separated out into two messages in order 1665 to ease the translation into other languages. */ 1666 if (symname == NULL || *symname == 0) 1667 _bfd_error_handler 1668 /* xgettext:c-format */ 1669 (_("%pB: register relocation against non-register symbol:" 1670 " (unknown) in %pA"), 1671 input_section->owner, symsec); 1672 else 1673 _bfd_error_handler 1674 /* xgettext:c-format */ 1675 (_("%pB: register relocation against non-register symbol:" 1676 " %s in %pA"), 1677 input_section->owner, symname, symsec); 1678 1679 /* The bfd_reloc_outofrange return value, though intuitively a 1680 better value, will not get us an error. */ 1681 return bfd_reloc_overflow; 1682 } 1683 do_mmix_reloc: 1684 contents += r_offset; 1685 r = mmix_elf_perform_relocation (input_section, howto, contents, 1686 addr, srel, error_message); 1687 break; 1688 1689 case R_MMIX_LOCAL: 1690 /* This isn't a real relocation, it's just an assertion that the 1691 final relocation value corresponds to a local register. We 1692 ignore the actual relocation; nothing is changed. */ 1693 { 1694 asection *regsec 1695 = bfd_get_section_by_name (input_section->output_section->owner, 1696 MMIX_REG_CONTENTS_SECTION_NAME); 1697 bfd_vma first_global; 1698 1699 /* Check that this is an absolute value, or a reference to the 1700 register contents section or the register (symbol) section. 1701 Absolute numbers can get here as undefined section. Undefined 1702 symbols are signalled elsewhere, so there's no conflict in us 1703 accidentally handling it. */ 1704 if (!bfd_is_abs_section (symsec) 1705 && !bfd_is_und_section (symsec) 1706 && strcmp (bfd_section_name (symsec), 1707 MMIX_REG_CONTENTS_SECTION_NAME) != 0 1708 && strcmp (bfd_section_name (symsec), 1709 MMIX_REG_SECTION_NAME) != 0) 1710 { 1711 _bfd_error_handler 1712 (_("%pB: directive LOCAL valid only with a register or absolute value"), 1713 input_section->owner); 1714 1715 return bfd_reloc_overflow; 1716 } 1717 1718 /* If we don't have a register contents section, then $255 is the 1719 first global register. */ 1720 if (regsec == NULL) 1721 first_global = 255; 1722 else 1723 { 1724 first_global = bfd_section_vma (regsec) / 8; 1725 if (strcmp (bfd_section_name (symsec), 1726 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1727 { 1728 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1729 /* The bfd_reloc_outofrange return value, though 1730 intuitively a better value, will not get us an error. */ 1731 return bfd_reloc_overflow; 1732 srel /= 8; 1733 } 1734 } 1735 1736 if ((bfd_vma) srel >= first_global) 1737 { 1738 /* FIXME: Better error message. */ 1739 _bfd_error_handler 1740 /* xgettext:c-format */ 1741 (_("%pB: LOCAL directive: " 1742 "register $%" PRId64 " is not a local register;" 1743 " first global register is $%" PRId64), 1744 input_section->owner, (int64_t) srel, (int64_t) first_global); 1745 1746 return bfd_reloc_overflow; 1747 } 1748 } 1749 r = bfd_reloc_ok; 1750 break; 1751 1752 default: 1753 r = _bfd_final_link_relocate (howto, input_section->owner, input_section, 1754 contents, r_offset, 1755 relocation, r_addend); 1756 } 1757 1758 return r; 1759 } 1760 1761 /* Return the section that should be marked against GC for a given 1763 relocation. */ 1764 1765 static asection * 1766 mmix_elf_gc_mark_hook (asection *sec, 1767 struct bfd_link_info *info, 1768 struct elf_reloc_cookie *cookie, 1769 struct elf_link_hash_entry *h, 1770 unsigned int symndx) 1771 { 1772 if (h != NULL) 1773 switch (ELF64_R_TYPE (cookie->rel->r_info)) 1774 { 1775 case R_MMIX_GNU_VTINHERIT: 1776 case R_MMIX_GNU_VTENTRY: 1777 return NULL; 1778 } 1779 1780 return _bfd_elf_gc_mark_hook (sec, info, cookie, h, symndx); 1781 } 1782 1783 /* Sort register relocs to come before expanding relocs. */ 1785 1786 static int 1787 mmix_elf_sort_relocs (const void * p1, const void * p2) 1788 { 1789 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1; 1790 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2; 1791 int r1_is_reg, r2_is_reg; 1792 1793 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive 1794 insns. */ 1795 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3)) 1796 return 1; 1797 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3)) 1798 return -1; 1799 1800 r1_is_reg 1801 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE 1802 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG); 1803 r2_is_reg 1804 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE 1805 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG); 1806 if (r1_is_reg != r2_is_reg) 1807 return r2_is_reg - r1_is_reg; 1808 1809 /* Neither or both are register relocs. Then sort on full offset. */ 1810 if (r1->r_offset > r2->r_offset) 1811 return 1; 1812 else if (r1->r_offset < r2->r_offset) 1813 return -1; 1814 return 0; 1815 } 1816 1817 /* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */ 1818 1819 static bool 1820 mmix_elf_check_common_relocs (bfd *abfd, 1821 struct bfd_link_info *info, 1822 asection *sec, 1823 const Elf_Internal_Rela *relocs) 1824 { 1825 bfd *bpo_greg_owner = NULL; 1826 asection *allocated_gregs_section = NULL; 1827 struct bpo_greg_section_info *gregdata = NULL; 1828 struct bpo_reloc_section_info *bpodata = NULL; 1829 const Elf_Internal_Rela *rel; 1830 const Elf_Internal_Rela *rel_end; 1831 1832 /* We currently have to abuse this COFF-specific member, since there's 1833 no target-machine-dedicated member. There's no alternative outside 1834 the bfd_link_info struct; we can't specialize a hash-table since 1835 they're different between ELF and mmo. */ 1836 bpo_greg_owner = (bfd *) info->base_file; 1837 1838 rel_end = relocs + sec->reloc_count; 1839 for (rel = relocs; rel < rel_end; rel++) 1840 { 1841 switch (ELF64_R_TYPE (rel->r_info)) 1842 { 1843 /* This relocation causes a GREG allocation. We need to count 1844 them, and we need to create a section for them, so we need an 1845 object to fake as the owner of that section. We can't use 1846 the ELF dynobj for this, since the ELF bits assume lots of 1847 DSO-related stuff if that member is non-NULL. */ 1848 case R_MMIX_BASE_PLUS_OFFSET: 1849 /* We don't do anything with this reloc for a relocatable link. */ 1850 if (bfd_link_relocatable (info)) 1851 break; 1852 1853 if (bpo_greg_owner == NULL) 1854 { 1855 bpo_greg_owner = abfd; 1856 info->base_file = bpo_greg_owner; 1857 } 1858 1859 if (allocated_gregs_section == NULL) 1860 allocated_gregs_section 1861 = bfd_get_section_by_name (bpo_greg_owner, 1862 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 1863 1864 if (allocated_gregs_section == NULL) 1865 { 1866 allocated_gregs_section 1867 = bfd_make_section_with_flags (bpo_greg_owner, 1868 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME, 1869 (SEC_HAS_CONTENTS 1870 | SEC_IN_MEMORY 1871 | SEC_LINKER_CREATED)); 1872 /* Setting both SEC_ALLOC and SEC_LOAD means the section is 1873 treated like any other section, and we'd get errors for 1874 address overlap with the text section. Let's set none of 1875 those flags, as that is what currently happens for usual 1876 GREG allocations, and that works. */ 1877 if (allocated_gregs_section == NULL 1878 || !bfd_set_section_alignment (allocated_gregs_section, 3)) 1879 return false; 1880 1881 gregdata = (struct bpo_greg_section_info *) 1882 bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info)); 1883 if (gregdata == NULL) 1884 return false; 1885 mmix_elf_section_data (allocated_gregs_section)->bpo.greg 1886 = gregdata; 1887 } 1888 else if (gregdata == NULL) 1889 gregdata 1890 = mmix_elf_section_data (allocated_gregs_section)->bpo.greg; 1891 1892 /* Get ourselves some auxiliary info for the BPO-relocs. */ 1893 if (bpodata == NULL) 1894 { 1895 /* No use doing a separate iteration pass to find the upper 1896 limit - just use the number of relocs. */ 1897 bpodata = (struct bpo_reloc_section_info *) 1898 bfd_alloc (bpo_greg_owner, 1899 sizeof (struct bpo_reloc_section_info) 1900 * (sec->reloc_count + 1)); 1901 if (bpodata == NULL) 1902 return false; 1903 mmix_elf_section_data (sec)->bpo.reloc = bpodata; 1904 bpodata->first_base_plus_offset_reloc 1905 = bpodata->bpo_index 1906 = gregdata->n_max_bpo_relocs; 1907 bpodata->bpo_greg_section 1908 = allocated_gregs_section; 1909 bpodata->n_bpo_relocs_this_section = 0; 1910 } 1911 1912 bpodata->n_bpo_relocs_this_section++; 1913 gregdata->n_max_bpo_relocs++; 1914 1915 /* We don't get another chance to set this before GC; we've not 1916 set up any hook that runs before GC. */ 1917 gregdata->n_bpo_relocs 1918 = gregdata->n_max_bpo_relocs; 1919 break; 1920 1921 case R_MMIX_PUSHJ_STUBBABLE: 1922 mmix_elf_section_data (sec)->pjs.n_pushj_relocs++; 1923 break; 1924 } 1925 } 1926 1927 /* Allocate per-reloc stub storage and initialize it to the max stub 1928 size. */ 1929 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0) 1930 { 1931 size_t i; 1932 1933 mmix_elf_section_data (sec)->pjs.stub_size 1934 = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs 1935 * sizeof (mmix_elf_section_data (sec) 1936 ->pjs.stub_size[0])); 1937 if (mmix_elf_section_data (sec)->pjs.stub_size == NULL) 1938 return false; 1939 1940 for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++) 1941 mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE; 1942 } 1943 1944 return true; 1945 } 1946 1947 /* Look through the relocs for a section during the first phase. */ 1948 1949 static bool 1950 mmix_elf_check_relocs (bfd *abfd, 1951 struct bfd_link_info *info, 1952 asection *sec, 1953 const Elf_Internal_Rela *relocs) 1954 { 1955 Elf_Internal_Shdr *symtab_hdr; 1956 struct elf_link_hash_entry **sym_hashes; 1957 const Elf_Internal_Rela *rel; 1958 const Elf_Internal_Rela *rel_end; 1959 1960 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1961 sym_hashes = elf_sym_hashes (abfd); 1962 1963 /* First we sort the relocs so that any register relocs come before 1964 expansion-relocs to the same insn. FIXME: Not done for mmo. */ 1965 qsort ((void *) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), 1966 mmix_elf_sort_relocs); 1967 1968 /* Do the common part. */ 1969 if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs)) 1970 return false; 1971 1972 if (bfd_link_relocatable (info)) 1973 return true; 1974 1975 rel_end = relocs + sec->reloc_count; 1976 for (rel = relocs; rel < rel_end; rel++) 1977 { 1978 struct elf_link_hash_entry *h; 1979 unsigned long r_symndx; 1980 1981 r_symndx = ELF64_R_SYM (rel->r_info); 1982 if (r_symndx < symtab_hdr->sh_info) 1983 h = NULL; 1984 else 1985 { 1986 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1987 while (h->root.type == bfd_link_hash_indirect 1988 || h->root.type == bfd_link_hash_warning) 1989 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1990 } 1991 1992 switch (ELF64_R_TYPE (rel->r_info)) 1993 { 1994 /* This relocation describes the C++ object vtable hierarchy. 1995 Reconstruct it for later use during GC. */ 1996 case R_MMIX_GNU_VTINHERIT: 1997 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1998 return false; 1999 break; 2000 2001 /* This relocation describes which C++ vtable entries are actually 2002 used. Record for later use during GC. */ 2003 case R_MMIX_GNU_VTENTRY: 2004 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2005 return false; 2006 break; 2007 } 2008 } 2009 2010 return true; 2011 } 2012 2013 /* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo. 2014 Copied from elf_link_add_object_symbols. */ 2015 2016 bool 2017 _bfd_mmix_check_all_relocs (bfd *abfd, struct bfd_link_info *info) 2018 { 2019 asection *o; 2020 2021 for (o = abfd->sections; o != NULL; o = o->next) 2022 { 2023 Elf_Internal_Rela *internal_relocs; 2024 bool ok; 2025 2026 if ((o->flags & SEC_RELOC) == 0 2027 || o->reloc_count == 0 2028 || ((info->strip == strip_all || info->strip == strip_debugger) 2029 && (o->flags & SEC_DEBUGGING) != 0) 2030 || bfd_is_abs_section (o->output_section)) 2031 continue; 2032 2033 internal_relocs 2034 = _bfd_elf_link_read_relocs (abfd, o, NULL, 2035 (Elf_Internal_Rela *) NULL, 2036 info->keep_memory); 2037 if (internal_relocs == NULL) 2038 return false; 2039 2040 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs); 2041 2042 if (! info->keep_memory) 2043 free (internal_relocs); 2044 2045 if (! ok) 2046 return false; 2047 } 2048 2049 return true; 2050 } 2051 2052 /* Change symbols relative to the reg contents section to instead be to 2054 the register section, and scale them down to correspond to the register 2055 number. */ 2056 2057 static int 2058 mmix_elf_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED, 2059 const char *name ATTRIBUTE_UNUSED, 2060 Elf_Internal_Sym *sym, 2061 asection *input_sec, 2062 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) 2063 { 2064 if (input_sec != NULL 2065 && input_sec->name != NULL 2066 && ELF_ST_TYPE (sym->st_info) != STT_SECTION 2067 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0) 2068 { 2069 sym->st_value /= 8; 2070 sym->st_shndx = SHN_REGISTER; 2071 } 2072 2073 return 1; 2074 } 2075 2076 /* We fake a register section that holds values that are register numbers. 2077 Having a SHN_REGISTER and register section translates better to other 2078 formats (e.g. mmo) than for example a STT_REGISTER attribute. 2079 This section faking is based on a construct in elf32-mips.c. */ 2080 static asection mmix_elf_reg_section; 2081 static const asymbol mmix_elf_reg_section_symbol = 2082 GLOBAL_SYM_INIT (MMIX_REG_SECTION_NAME, &mmix_elf_reg_section); 2083 static asection mmix_elf_reg_section = 2084 BFD_FAKE_SECTION (mmix_elf_reg_section, &mmix_elf_reg_section_symbol, 2085 MMIX_REG_SECTION_NAME, 0, SEC_NO_FLAGS); 2086 2087 /* Handle the special section numbers that a symbol may use. */ 2088 2089 void 2090 mmix_elf_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, asymbol *asym) 2091 { 2092 elf_symbol_type *elfsym; 2093 2094 elfsym = (elf_symbol_type *) asym; 2095 switch (elfsym->internal_elf_sym.st_shndx) 2096 { 2097 case SHN_REGISTER: 2098 asym->section = &mmix_elf_reg_section; 2099 break; 2100 2101 default: 2102 break; 2103 } 2104 } 2105 2106 /* Given a BFD section, try to locate the corresponding ELF section 2107 index. */ 2108 2109 static bool 2110 mmix_elf_section_from_bfd_section (bfd * abfd ATTRIBUTE_UNUSED, 2111 asection * sec, 2112 int * retval) 2113 { 2114 if (strcmp (bfd_section_name (sec), MMIX_REG_SECTION_NAME) == 0) 2115 *retval = SHN_REGISTER; 2116 else 2117 return false; 2118 2119 return true; 2120 } 2121 2122 /* Hook called by the linker routine which adds symbols from an object 2123 file. We must handle the special SHN_REGISTER section number here. 2124 2125 We also check that we only have *one* each of the section-start 2126 symbols, since otherwise having two with the same value would cause 2127 them to be "merged", but with the contents serialized. */ 2128 2129 static bool 2130 mmix_elf_add_symbol_hook (bfd *abfd, 2131 struct bfd_link_info *info ATTRIBUTE_UNUSED, 2132 Elf_Internal_Sym *sym, 2133 const char **namep ATTRIBUTE_UNUSED, 2134 flagword *flagsp ATTRIBUTE_UNUSED, 2135 asection **secp, 2136 bfd_vma *valp ATTRIBUTE_UNUSED) 2137 { 2138 if (sym->st_shndx == SHN_REGISTER) 2139 { 2140 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME); 2141 (*secp)->flags |= SEC_LINKER_CREATED; 2142 } 2143 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.' 2144 && startswith (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) 2145 { 2146 /* See if we have another one. */ 2147 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash, 2148 *namep, 2149 false, 2150 false, 2151 false); 2152 2153 if (h != NULL && h->type != bfd_link_hash_undefined) 2154 { 2155 /* How do we get the asymbol (or really: the filename) from h? 2156 h->u.def.section->owner is NULL. */ 2157 _bfd_error_handler 2158 /* xgettext:c-format */ 2159 (_("%pB: error: multiple definition of `%s'; start of %s " 2160 "is set in a earlier linked file"), 2161 abfd, *namep, 2162 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)); 2163 bfd_set_error (bfd_error_bad_value); 2164 return false; 2165 } 2166 } 2167 2168 return true; 2169 } 2170 2171 /* We consider symbols matching "L.*:[0-9]+" to be local symbols. */ 2172 2173 static bool 2174 mmix_elf_is_local_label_name (bfd *abfd, const char *name) 2175 { 2176 const char *colpos; 2177 int digits; 2178 2179 /* Also include the default local-label definition. */ 2180 if (_bfd_elf_is_local_label_name (abfd, name)) 2181 return true; 2182 2183 if (*name != 'L') 2184 return false; 2185 2186 /* If there's no ":", or more than one, it's not a local symbol. */ 2187 colpos = strchr (name, ':'); 2188 if (colpos == NULL || strchr (colpos + 1, ':') != NULL) 2189 return false; 2190 2191 /* Check that there are remaining characters and that they are digits. */ 2192 if (colpos[1] == 0) 2193 return false; 2194 2195 digits = strspn (colpos + 1, "0123456789"); 2196 return digits != 0 && colpos[1 + digits] == 0; 2197 } 2198 2199 /* We get rid of the register section here. */ 2200 2201 bool 2202 mmix_elf_final_link (bfd *abfd, struct bfd_link_info *info) 2203 { 2204 /* We never output a register section, though we create one for 2205 temporary measures. Check that nobody entered contents into it. */ 2206 asection *reg_section; 2207 2208 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME); 2209 2210 if (reg_section != NULL) 2211 { 2212 /* FIXME: Pass error state gracefully. */ 2213 if (bfd_section_flags (reg_section) & SEC_HAS_CONTENTS) 2214 _bfd_abort (__FILE__, __LINE__, _("register section has contents\n")); 2215 2216 /* Really remove the section, if it hasn't already been done. */ 2217 if (!bfd_section_removed_from_list (abfd, reg_section)) 2218 { 2219 bfd_section_list_remove (abfd, reg_section); 2220 --abfd->section_count; 2221 } 2222 } 2223 2224 if (! _bfd_elf_final_link (abfd, info)) 2225 return false; 2226 2227 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by 2228 the regular linker machinery. We do it here, like other targets with 2229 special sections. */ 2230 if (info->base_file != NULL) 2231 { 2232 asection *greg_section 2233 = bfd_get_section_by_name ((bfd *) info->base_file, 2234 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2235 if (!bfd_set_section_contents (abfd, 2236 greg_section->output_section, 2237 greg_section->contents, 2238 (file_ptr) greg_section->output_offset, 2239 greg_section->size)) 2240 return false; 2241 } 2242 return true; 2243 } 2244 2245 /* We need to include the maximum size of PUSHJ-stubs in the initial 2246 section size. This is expected to shrink during linker relaxation. */ 2247 2248 static void 2249 mmix_set_relaxable_size (bfd *abfd ATTRIBUTE_UNUSED, 2250 asection *sec, 2251 void *ptr) 2252 { 2253 struct bfd_link_info *info = ptr; 2254 2255 /* Make sure we only do this for section where we know we want this, 2256 otherwise we might end up resetting the size of COMMONs. */ 2257 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0) 2258 return; 2259 2260 sec->rawsize = sec->size; 2261 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2262 * MAX_PUSHJ_STUB_SIZE); 2263 2264 /* For use in relocatable link, we start with a max stubs size. See 2265 mmix_elf_relax_section. */ 2266 if (bfd_link_relocatable (info) && sec->output_section) 2267 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum 2268 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2269 * MAX_PUSHJ_STUB_SIZE); 2270 } 2271 2272 /* Initialize stuff for the linker-generated GREGs to match 2273 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */ 2274 2275 bool 2276 _bfd_mmix_before_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2277 struct bfd_link_info *info) 2278 { 2279 asection *bpo_gregs_section; 2280 bfd *bpo_greg_owner; 2281 struct bpo_greg_section_info *gregdata; 2282 size_t n_gregs; 2283 bfd_vma gregs_size; 2284 size_t i; 2285 size_t *bpo_reloc_indexes; 2286 bfd *ibfd; 2287 2288 /* Set the initial size of sections. */ 2289 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 2290 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info); 2291 2292 /* The bpo_greg_owner bfd is supposed to have been set by 2293 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen. 2294 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2295 bpo_greg_owner = (bfd *) info->base_file; 2296 if (bpo_greg_owner == NULL) 2297 return true; 2298 2299 bpo_gregs_section 2300 = bfd_get_section_by_name (bpo_greg_owner, 2301 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2302 2303 if (bpo_gregs_section == NULL) 2304 return true; 2305 2306 /* We use the target-data handle in the ELF section data. */ 2307 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2308 if (gregdata == NULL) 2309 return false; 2310 2311 n_gregs = gregdata->n_bpo_relocs; 2312 gregdata->n_allocated_bpo_gregs = n_gregs; 2313 2314 /* When this reaches zero during relaxation, all entries have been 2315 filled in and the size of the linker gregs can be calculated. */ 2316 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs; 2317 2318 /* Set the zeroth-order estimate for the GREGs size. */ 2319 gregs_size = n_gregs * 8; 2320 2321 if (!bfd_set_section_size (bpo_gregs_section, gregs_size)) 2322 return false; 2323 2324 /* Allocate and set up the GREG arrays. They're filled in at relaxation 2325 time. Note that we must use the max number ever noted for the array, 2326 since the index numbers were created before GC. */ 2327 gregdata->reloc_request 2328 = bfd_zalloc (bpo_greg_owner, 2329 sizeof (struct bpo_reloc_request) 2330 * gregdata->n_max_bpo_relocs); 2331 2332 gregdata->bpo_reloc_indexes 2333 = bpo_reloc_indexes 2334 = bfd_alloc (bpo_greg_owner, 2335 gregdata->n_max_bpo_relocs 2336 * sizeof (size_t)); 2337 if (bpo_reloc_indexes == NULL) 2338 return false; 2339 2340 /* The default order is an identity mapping. */ 2341 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2342 { 2343 bpo_reloc_indexes[i] = i; 2344 gregdata->reloc_request[i].bpo_reloc_no = i; 2345 } 2346 2347 return true; 2348 } 2349 2350 /* Fill in contents in the linker allocated gregs. Everything is 2352 calculated at this point; we just move the contents into place here. */ 2353 2354 bool 2355 _bfd_mmix_after_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2356 struct bfd_link_info *link_info) 2357 { 2358 asection *bpo_gregs_section; 2359 bfd *bpo_greg_owner; 2360 struct bpo_greg_section_info *gregdata; 2361 size_t n_gregs; 2362 size_t i, j; 2363 size_t lastreg; 2364 bfd_byte *contents; 2365 2366 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs 2367 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such 2368 object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2369 bpo_greg_owner = (bfd *) link_info->base_file; 2370 if (bpo_greg_owner == NULL) 2371 return true; 2372 2373 bpo_gregs_section 2374 = bfd_get_section_by_name (bpo_greg_owner, 2375 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2376 2377 /* This can't happen without DSO handling. When DSOs are handled 2378 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such 2379 section. */ 2380 if (bpo_gregs_section == NULL) 2381 return true; 2382 2383 /* We use the target-data handle in the ELF section data. */ 2384 2385 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2386 if (gregdata == NULL) 2387 return false; 2388 2389 n_gregs = gregdata->n_allocated_bpo_gregs; 2390 2391 bpo_gregs_section->contents 2392 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size); 2393 if (contents == NULL) 2394 return false; 2395 bpo_gregs_section->alloced = 1; 2396 2397 /* Sanity check: If these numbers mismatch, some relocation has not been 2398 accounted for and the rest of gregdata is probably inconsistent. 2399 It's a bug, but it's more helpful to identify it than segfaulting 2400 below. */ 2401 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round 2402 != gregdata->n_bpo_relocs) 2403 { 2404 _bfd_error_handler 2405 /* xgettext:c-format */ 2406 (_("internal inconsistency: remaining %lu != max %lu;" 2407 " please report this bug"), 2408 (unsigned long) gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2409 (unsigned long) gregdata->n_bpo_relocs); 2410 return false; 2411 } 2412 2413 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++) 2414 if (gregdata->reloc_request[i].regindex != lastreg) 2415 { 2416 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value, 2417 contents + j * 8); 2418 lastreg = gregdata->reloc_request[i].regindex; 2419 j++; 2420 } 2421 2422 return true; 2423 } 2424 2425 /* Sort valid relocs to come before non-valid relocs, then on increasing 2426 value. */ 2427 2428 static int 2429 bpo_reloc_request_sort_fn (const void * p1, const void * p2) 2430 { 2431 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1; 2432 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2; 2433 2434 /* Primary function is validity; non-valid relocs sorted after valid 2435 ones. */ 2436 if (r1->valid != r2->valid) 2437 return r2->valid - r1->valid; 2438 2439 /* Then sort on value. Don't simplify and return just the difference of 2440 the values: the upper bits of the 64-bit value would be truncated on 2441 a host with 32-bit ints. */ 2442 if (r1->value != r2->value) 2443 return r1->value > r2->value ? 1 : -1; 2444 2445 /* As a last re-sort, use the relocation number, so we get a stable 2446 sort. The *addresses* aren't stable since items are swapped during 2447 sorting. It depends on the qsort implementation if this actually 2448 happens. */ 2449 return r1->bpo_reloc_no > r2->bpo_reloc_no 2450 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0); 2451 } 2452 2453 /* For debug use only. Dumps the global register allocations resulting 2454 from base-plus-offset relocs. */ 2455 2456 void 2457 mmix_dump_bpo_gregs (struct bfd_link_info *link_info, 2458 void (*pf) (const char *fmt, ...)) 2459 { 2460 bfd *bpo_greg_owner; 2461 asection *bpo_gregs_section; 2462 struct bpo_greg_section_info *gregdata; 2463 unsigned int i; 2464 2465 if (link_info == NULL || link_info->base_file == NULL) 2466 return; 2467 2468 bpo_greg_owner = (bfd *) link_info->base_file; 2469 2470 bpo_gregs_section 2471 = bfd_get_section_by_name (bpo_greg_owner, 2472 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2473 2474 if (bpo_gregs_section == NULL) 2475 return; 2476 2477 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2478 if (gregdata == NULL) 2479 return; 2480 2481 if (pf == NULL) 2482 pf = _bfd_error_handler; 2483 2484 /* These format strings are not translated. They are for debug purposes 2485 only and never displayed to an end user. Should they escape, we 2486 surely want them in original. */ 2487 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\ 2488 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs, 2489 gregdata->n_max_bpo_relocs, 2490 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2491 gregdata->n_allocated_bpo_gregs); 2492 2493 if (gregdata->reloc_request) 2494 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2495 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n", 2496 i, 2497 (gregdata->bpo_reloc_indexes != NULL 2498 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1), 2499 gregdata->reloc_request[i].bpo_reloc_no, 2500 gregdata->reloc_request[i].valid, 2501 2502 (unsigned long) (gregdata->reloc_request[i].value >> 32), 2503 (unsigned long) gregdata->reloc_request[i].value, 2504 gregdata->reloc_request[i].regindex, 2505 gregdata->reloc_request[i].offset); 2506 } 2507 2508 /* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and 2509 when the last such reloc is done, an index-array is sorted according to 2510 the values and iterated over to produce register numbers (indexed by 0 2511 from the first allocated register number) and offsets for use in real 2512 relocation. (N.B.: Relocatable runs are handled, not just punted.) 2513 2514 PUSHJ stub accounting is also done here. 2515 2516 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 2517 2518 static bool 2519 mmix_elf_relax_section (bfd *abfd, 2520 asection *sec, 2521 struct bfd_link_info *link_info, 2522 bool *again) 2523 { 2524 Elf_Internal_Shdr *symtab_hdr; 2525 Elf_Internal_Rela *internal_relocs; 2526 Elf_Internal_Rela *irel, *irelend; 2527 asection *bpo_gregs_section = NULL; 2528 struct bpo_greg_section_info *gregdata; 2529 struct bpo_reloc_section_info *bpodata 2530 = mmix_elf_section_data (sec)->bpo.reloc; 2531 /* The initialization is to quiet compiler warnings. The value is to 2532 spot a missing actual initialization. */ 2533 size_t bpono = (size_t) -1; 2534 size_t pjsno = 0; 2535 size_t pjsno_undefs = 0; 2536 Elf_Internal_Sym *isymbuf = NULL; 2537 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size; 2538 2539 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0; 2540 2541 /* Assume nothing changes. */ 2542 *again = false; 2543 2544 /* We don't have to do anything if this section does not have relocs, or 2545 if this is not a code section. */ 2546 if ((sec->flags & SEC_RELOC) == 0 2547 || sec->reloc_count == 0 2548 || (sec->flags & SEC_CODE) == 0 2549 || (sec->flags & SEC_LINKER_CREATED) != 0 2550 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs, 2551 then nothing to do. */ 2552 || (bpodata == NULL 2553 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)) 2554 return true; 2555 2556 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2557 2558 if (bpodata != NULL) 2559 { 2560 bpo_gregs_section = bpodata->bpo_greg_section; 2561 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2562 bpono = bpodata->first_base_plus_offset_reloc; 2563 } 2564 else 2565 gregdata = NULL; 2566 2567 /* Get a copy of the native relocations. */ 2568 internal_relocs 2569 = _bfd_elf_link_read_relocs (abfd, sec, NULL, 2570 (Elf_Internal_Rela *) NULL, 2571 link_info->keep_memory); 2572 if (internal_relocs == NULL) 2573 goto error_return; 2574 2575 /* Walk through them looking for relaxing opportunities. */ 2576 irelend = internal_relocs + sec->reloc_count; 2577 for (irel = internal_relocs; irel < irelend; irel++) 2578 { 2579 bfd_vma symval; 2580 struct elf_link_hash_entry *h = NULL; 2581 2582 /* We only process two relocs. */ 2583 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET 2584 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE) 2585 continue; 2586 2587 /* We process relocs in a distinctly different way when this is a 2588 relocatable link (for one, we don't look at symbols), so we avoid 2589 mixing its code with that for the "normal" relaxation. */ 2590 if (bfd_link_relocatable (link_info)) 2591 { 2592 /* The only transformation in a relocatable link is to generate 2593 a full stub at the location of the stub calculated for the 2594 input section, if the relocated stub location, the end of the 2595 output section plus earlier stubs, cannot be reached. Thus 2596 relocatable linking can only lead to worse code, but it still 2597 works. */ 2598 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE) 2599 { 2600 /* If we can reach the end of the output-section and beyond 2601 any current stubs, then we don't need a stub for this 2602 reloc. The relaxed order of output stub allocation may 2603 not exactly match the straightforward order, so we always 2604 assume presence of output stubs, which will allow 2605 relaxation only on relocations indifferent to the 2606 presence of output stub allocations for other relocations 2607 and thus the order of output stub allocation. */ 2608 if (bfd_check_overflow (complain_overflow_signed, 2609 19, 2610 0, 2611 bfd_arch_bits_per_address (abfd), 2612 /* Output-stub location. */ 2613 sec->output_section->rawsize 2614 + (mmix_elf_section_data (sec 2615 ->output_section) 2616 ->pjs.stubs_size_sum) 2617 /* Location of this PUSHJ reloc. */ 2618 - (sec->output_offset + irel->r_offset) 2619 /* Don't count *this* stub twice. */ 2620 - (mmix_elf_section_data (sec) 2621 ->pjs.stub_size[pjsno] 2622 + MAX_PUSHJ_STUB_SIZE)) 2623 == bfd_reloc_ok) 2624 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2625 2626 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2627 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2628 2629 pjsno++; 2630 } 2631 2632 continue; 2633 } 2634 2635 /* Get the value of the symbol referred to by the reloc. */ 2636 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2637 { 2638 /* A local symbol. */ 2639 Elf_Internal_Sym *isym; 2640 asection *sym_sec; 2641 2642 /* Read this BFD's local symbols if we haven't already. */ 2643 if (isymbuf == NULL) 2644 { 2645 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2646 if (isymbuf == NULL) 2647 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2648 symtab_hdr->sh_info, 0, 2649 NULL, NULL, NULL); 2650 if (isymbuf == 0) 2651 goto error_return; 2652 } 2653 2654 isym = isymbuf + ELF64_R_SYM (irel->r_info); 2655 if (isym->st_shndx == SHN_UNDEF) 2656 sym_sec = bfd_und_section_ptr; 2657 else if (isym->st_shndx == SHN_ABS) 2658 sym_sec = bfd_abs_section_ptr; 2659 else if (isym->st_shndx == SHN_COMMON) 2660 sym_sec = bfd_com_section_ptr; 2661 else 2662 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2663 symval = (isym->st_value 2664 + sym_sec->output_section->vma 2665 + sym_sec->output_offset); 2666 } 2667 else 2668 { 2669 unsigned long indx; 2670 2671 /* An external symbol. */ 2672 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2673 h = elf_sym_hashes (abfd)[indx]; 2674 BFD_ASSERT (h != NULL); 2675 if (h->root.type == bfd_link_hash_undefweak) 2676 /* FIXME: for R_MMIX_PUSHJ_STUBBABLE, there are alternatives to 2677 the canonical value 0 for an unresolved weak symbol to 2678 consider: as the debug-friendly approach, resolve to "abort" 2679 (or a port-specific function), or as the space-friendly 2680 approach resolve to the next instruction (like some other 2681 ports, notably ARM and AArch64). These alternatives require 2682 matching code in mmix_elf_perform_relocation or its caller. */ 2683 symval = 0; 2684 else if (h->root.type == bfd_link_hash_defined 2685 || h->root.type == bfd_link_hash_defweak) 2686 symval = (h->root.u.def.value 2687 + h->root.u.def.section->output_section->vma 2688 + h->root.u.def.section->output_offset); 2689 else 2690 { 2691 /* This appears to be a reference to an undefined symbol. Just 2692 ignore it--it will be caught by the regular reloc processing. 2693 We need to keep BPO reloc accounting consistent, though 2694 else we'll abort instead of emitting an error message. */ 2695 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET 2696 && gregdata != NULL) 2697 { 2698 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2699 bpono++; 2700 } 2701 2702 /* Similarly, keep accounting consistent for PUSHJ 2703 referring to an undefined symbol. */ 2704 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE) 2705 pjsno_undefs++; 2706 continue; 2707 } 2708 } 2709 2710 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE) 2711 { 2712 bfd_vma value = symval + irel->r_addend; 2713 bfd_vma dot 2714 = (sec->output_section->vma 2715 + sec->output_offset 2716 + irel->r_offset); 2717 bfd_vma stubaddr 2718 = (sec->output_section->vma 2719 + sec->output_offset 2720 + size 2721 + mmix_elf_section_data (sec)->pjs.stubs_size_sum); 2722 2723 if ((value & 3) == 0 2724 && bfd_check_overflow (complain_overflow_signed, 2725 19, 2726 0, 2727 bfd_arch_bits_per_address (abfd), 2728 value - dot 2729 - (value > dot 2730 ? mmix_elf_section_data (sec) 2731 ->pjs.stub_size[pjsno] 2732 : 0)) 2733 == bfd_reloc_ok) 2734 /* If the reloc fits, no stub is needed. */ 2735 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2736 else 2737 /* Maybe we can get away with just a JMP insn? */ 2738 if ((value & 3) == 0 2739 && bfd_check_overflow (complain_overflow_signed, 2740 27, 2741 0, 2742 bfd_arch_bits_per_address (abfd), 2743 value - stubaddr 2744 - (value > dot 2745 ? mmix_elf_section_data (sec) 2746 ->pjs.stub_size[pjsno] - 4 2747 : 0)) 2748 == bfd_reloc_ok) 2749 /* Yep, account for a stub consisting of a single JMP insn. */ 2750 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4; 2751 else 2752 /* Nope, go for the full insn stub. It doesn't seem useful to 2753 emit the intermediate sizes; those will only be useful for 2754 a >64M program assuming contiguous code. */ 2755 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] 2756 = MAX_PUSHJ_STUB_SIZE; 2757 2758 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2759 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2760 pjsno++; 2761 continue; 2762 } 2763 2764 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */ 2765 2766 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value 2767 = symval + irel->r_addend; 2768 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = true; 2769 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2770 } 2771 2772 /* Check if that was the last BPO-reloc. If so, sort the values and 2773 calculate how many registers we need to cover them. Set the size of 2774 the linker gregs, and if the number of registers changed, indicate 2775 that we need to relax some more because we have more work to do. */ 2776 if (gregdata != NULL 2777 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0) 2778 { 2779 size_t i; 2780 bfd_vma prev_base; 2781 size_t regindex; 2782 2783 /* First, reset the remaining relocs for the next round. */ 2784 gregdata->n_remaining_bpo_relocs_this_relaxation_round 2785 = gregdata->n_bpo_relocs; 2786 2787 qsort (gregdata->reloc_request, 2788 gregdata->n_max_bpo_relocs, 2789 sizeof (struct bpo_reloc_request), 2790 bpo_reloc_request_sort_fn); 2791 2792 /* Recalculate indexes. When we find a change (however unlikely 2793 after the initial iteration), we know we need to relax again, 2794 since items in the GREG-array are sorted by increasing value and 2795 stored in the relaxation phase. */ 2796 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2797 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2798 != i) 2799 { 2800 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2801 = i; 2802 *again = true; 2803 } 2804 2805 /* Allocate register numbers (indexing from 0). Stop at the first 2806 non-valid reloc. */ 2807 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value; 2808 i < gregdata->n_bpo_relocs; 2809 i++) 2810 { 2811 if (gregdata->reloc_request[i].value > prev_base + 255) 2812 { 2813 regindex++; 2814 prev_base = gregdata->reloc_request[i].value; 2815 } 2816 gregdata->reloc_request[i].regindex = regindex; 2817 gregdata->reloc_request[i].offset 2818 = gregdata->reloc_request[i].value - prev_base; 2819 } 2820 2821 /* If it's not the same as the last time, we need to relax again, 2822 because the size of the section has changed. I'm not sure we 2823 actually need to do any adjustments since the shrinking happens 2824 at the start of this section, but better safe than sorry. */ 2825 if (gregdata->n_allocated_bpo_gregs != regindex + 1) 2826 { 2827 gregdata->n_allocated_bpo_gregs = regindex + 1; 2828 *again = true; 2829 } 2830 2831 bpo_gregs_section->size = (regindex + 1) * 8; 2832 } 2833 2834 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2835 { 2836 if (! link_info->keep_memory) 2837 free (isymbuf); 2838 else 2839 { 2840 /* Cache the symbols for elf_link_input_bfd. */ 2841 symtab_hdr->contents = (unsigned char *) isymbuf; 2842 } 2843 } 2844 2845 BFD_ASSERT(pjsno + pjsno_undefs 2846 == mmix_elf_section_data (sec)->pjs.n_pushj_relocs); 2847 2848 if (elf_section_data (sec)->relocs != internal_relocs) 2849 free (internal_relocs); 2850 2851 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2852 abort (); 2853 2854 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2855 { 2856 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum; 2857 *again = true; 2858 } 2859 2860 return true; 2861 2862 error_return: 2863 if ((unsigned char *) isymbuf != symtab_hdr->contents) 2864 free (isymbuf); 2865 if (elf_section_data (sec)->relocs != internal_relocs) 2866 free (internal_relocs); 2867 return false; 2868 } 2869 2870 #define ELF_ARCH bfd_arch_mmix 2872 #define ELF_MACHINE_CODE EM_MMIX 2873 #define ELF_TARGET_ID MMIX_ELF_DATA 2874 2875 /* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL). 2876 However, that's too much for something somewhere in the linker part of 2877 BFD; perhaps the start-address has to be a non-zero multiple of this 2878 number, or larger than this number. The symptom is that the linker 2879 complains: "warning: allocated section `.text' not in segment". We 2880 settle for 64k; the page-size used in examples is 8k. 2881 #define ELF_MAXPAGESIZE 0x10000 2882 2883 Unfortunately, this causes excessive padding in the supposedly small 2884 for-education programs that are the expected usage (where people would 2885 inspect output). We stick to 256 bytes just to have *some* default 2886 alignment. */ 2887 #define ELF_MAXPAGESIZE 0x100 2888 2889 #define TARGET_BIG_SYM mmix_elf64_vec 2890 #define TARGET_BIG_NAME "elf64-mmix" 2891 2892 #define elf_info_to_howto_rel NULL 2893 #define elf_info_to_howto mmix_info_to_howto_rela 2894 #define elf_backend_relocate_section mmix_elf_relocate_section 2895 #define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook 2896 2897 #define elf_backend_link_output_symbol_hook \ 2898 mmix_elf_link_output_symbol_hook 2899 #define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook 2900 2901 #define elf_backend_check_relocs mmix_elf_check_relocs 2902 #define elf_backend_symbol_processing mmix_elf_symbol_processing 2903 #define elf_backend_omit_section_dynsym _bfd_elf_omit_section_dynsym_all 2904 2905 #define bfd_elf64_bfd_copy_link_hash_symbol_type \ 2906 _bfd_generic_copy_link_hash_symbol_type 2907 2908 #define bfd_elf64_bfd_is_local_label_name \ 2909 mmix_elf_is_local_label_name 2910 2911 #define elf_backend_may_use_rel_p 0 2912 #define elf_backend_may_use_rela_p 1 2913 #define elf_backend_default_use_rela_p 1 2914 2915 #define elf_backend_can_gc_sections 1 2916 #define elf_backend_section_from_bfd_section \ 2917 mmix_elf_section_from_bfd_section 2918 2919 #define bfd_elf64_new_section_hook mmix_elf_new_section_hook 2920 #define bfd_elf64_bfd_final_link mmix_elf_final_link 2921 #define bfd_elf64_bfd_relax_section mmix_elf_relax_section 2922 2923 #include "elf64-target.h" 2924
Indexes created Fri May 01 00:23:41 UTC 2026