1/* MMIX-specific support for 64-bit ELF. 2 Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007 3 Free Software Foundation, Inc. 4 Contributed by Hans-Peter Nilsson <hp@bitrange.com> 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 24/* No specific ABI or "processor-specific supplement" defined. */ 25 26/* TODO: 27 - "Traditional" linker relaxation (shrinking whole sections). 28 - Merge reloc stubs jumping to same location. 29 - GETA stub relaxation (call a stub for out of range new 30 R_MMIX_GETA_STUBBABLE). */ 31 32#include "sysdep.h" 33#include "bfd.h" 34#include "libbfd.h" 35#include "elf-bfd.h" 36#include "elf/mmix.h" 37#include "opcode/mmix.h" 38 39#define MINUS_ONE (((bfd_vma) 0) - 1) 40 41#define MAX_PUSHJ_STUB_SIZE (5 * 4) 42 43/* Put these everywhere in new code. */ 44#define FATAL_DEBUG \ 45 _bfd_abort (__FILE__, __LINE__, \ 46 "Internal: Non-debugged code (test-case missing)") 47 48#define BAD_CASE(x) \ 49 _bfd_abort (__FILE__, __LINE__, \ 50 "bad case for " #x) 51 52struct _mmix_elf_section_data 53{ 54 struct bfd_elf_section_data elf; 55 union 56 { 57 struct bpo_reloc_section_info *reloc; 58 struct bpo_greg_section_info *greg; 59 } bpo; 60 61 struct pushj_stub_info 62 { 63 /* Maximum number of stubs needed for this section. */ 64 bfd_size_type n_pushj_relocs; 65 66 /* Size of stubs after a mmix_elf_relax_section round. */ 67 bfd_size_type stubs_size_sum; 68 69 /* Per-reloc stubs_size_sum information. The stubs_size_sum member is the sum 70 of these. Allocated in mmix_elf_check_common_relocs. */ 71 bfd_size_type *stub_size; 72 73 /* Offset of next stub during relocation. Somewhat redundant with the 74 above: error coverage is easier and we don't have to reset the 75 stubs_size_sum for relocation. */ 76 bfd_size_type stub_offset; 77 } pjs; 78}; 79 80#define mmix_elf_section_data(sec) \ 81 ((struct _mmix_elf_section_data *) elf_section_data (sec)) 82 83/* For each section containing a base-plus-offset (BPO) reloc, we attach 84 this struct as mmix_elf_section_data (section)->bpo, which is otherwise 85 NULL. */ 86struct bpo_reloc_section_info 87 { 88 /* The base is 1; this is the first number in this section. */ 89 size_t first_base_plus_offset_reloc; 90 91 /* Number of BPO-relocs in this section. */ 92 size_t n_bpo_relocs_this_section; 93 94 /* Running index, used at relocation time. */ 95 size_t bpo_index; 96 97 /* We don't have access to the bfd_link_info struct in 98 mmix_final_link_relocate. What we really want to get at is the 99 global single struct greg_relocation, so we stash it here. */ 100 asection *bpo_greg_section; 101 }; 102 103/* Helper struct (in global context) for the one below. 104 There's one of these created for every BPO reloc. */ 105struct bpo_reloc_request 106 { 107 bfd_vma value; 108 109 /* Valid after relaxation. The base is 0; the first register number 110 must be added. The offset is in range 0..255. */ 111 size_t regindex; 112 size_t offset; 113 114 /* The order number for this BPO reloc, corresponding to the order in 115 which BPO relocs were found. Used to create an index after reloc 116 requests are sorted. */ 117 size_t bpo_reloc_no; 118 119 /* Set when the value is computed. Better than coding "guard values" 120 into the other members. Is FALSE only for BPO relocs in a GC:ed 121 section. */ 122 bfd_boolean valid; 123 }; 124 125/* We attach this as mmix_elf_section_data (sec)->bpo in the linker-allocated 126 greg contents section (MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME), 127 which is linked into the register contents section 128 (MMIX_REG_CONTENTS_SECTION_NAME). This section is created by the 129 linker; using the same hook as for usual with BPO relocs does not 130 collide. */ 131struct bpo_greg_section_info 132 { 133 /* After GC, this reflects the number of remaining, non-excluded 134 BPO-relocs. */ 135 size_t n_bpo_relocs; 136 137 /* This is the number of allocated bpo_reloc_requests; the size of 138 sorted_indexes. Valid after the check.*relocs functions are called 139 for all incoming sections. It includes the number of BPO relocs in 140 sections that were GC:ed. */ 141 size_t n_max_bpo_relocs; 142 143 /* A counter used to find out when to fold the BPO gregs, since we 144 don't have a single "after-relaxation" hook. */ 145 size_t n_remaining_bpo_relocs_this_relaxation_round; 146 147 /* The number of linker-allocated GREGs resulting from BPO relocs. 148 This is an approximation after _bfd_mmix_before_linker_allocation 149 and supposedly accurate after mmix_elf_relax_section is called for 150 all incoming non-collected sections. */ 151 size_t n_allocated_bpo_gregs; 152 153 /* Index into reloc_request[], sorted on increasing "value", secondary 154 by increasing index for strict sorting order. */ 155 size_t *bpo_reloc_indexes; 156 157 /* An array of all relocations, with the "value" member filled in by 158 the relaxation function. */ 159 struct bpo_reloc_request *reloc_request; 160 }; 161 162static bfd_boolean mmix_elf_link_output_symbol_hook 163 PARAMS ((struct bfd_link_info *, const char *, Elf_Internal_Sym *, 164 asection *, struct elf_link_hash_entry *)); 165 166static bfd_reloc_status_type mmix_elf_reloc 167 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 168 169static reloc_howto_type *bfd_elf64_bfd_reloc_type_lookup 170 PARAMS ((bfd *, bfd_reloc_code_real_type)); 171 172static void mmix_info_to_howto_rela 173 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 174 175static int mmix_elf_sort_relocs PARAMS ((const PTR, const PTR)); 176 177static bfd_boolean mmix_elf_new_section_hook 178 PARAMS ((bfd *, asection *)); 179 180static bfd_boolean mmix_elf_check_relocs 181 PARAMS ((bfd *, struct bfd_link_info *, asection *, 182 const Elf_Internal_Rela *)); 183 184static bfd_boolean mmix_elf_check_common_relocs 185 PARAMS ((bfd *, struct bfd_link_info *, asection *, 186 const Elf_Internal_Rela *)); 187 188static bfd_boolean mmix_elf_relocate_section 189 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 190 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 191 192static bfd_reloc_status_type mmix_final_link_relocate 193 PARAMS ((reloc_howto_type *, asection *, bfd_byte *, 194 bfd_vma, bfd_signed_vma, bfd_vma, const char *, asection *)); 195 196static bfd_reloc_status_type mmix_elf_perform_relocation 197 PARAMS ((asection *, reloc_howto_type *, PTR, bfd_vma, bfd_vma)); 198 199static bfd_boolean mmix_elf_section_from_bfd_section 200 PARAMS ((bfd *, asection *, int *)); 201 202static bfd_boolean mmix_elf_add_symbol_hook 203 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Sym *, 204 const char **, flagword *, asection **, bfd_vma *)); 205 206static bfd_boolean mmix_elf_is_local_label_name 207 PARAMS ((bfd *, const char *)); 208 209static int bpo_reloc_request_sort_fn PARAMS ((const PTR, const PTR)); 210 211static bfd_boolean mmix_elf_relax_section 212 PARAMS ((bfd *abfd, asection *sec, struct bfd_link_info *link_info, 213 bfd_boolean *again)); 214 215extern bfd_boolean mmix_elf_final_link PARAMS ((bfd *, struct bfd_link_info *)); 216 217extern void mmix_elf_symbol_processing PARAMS ((bfd *, asymbol *)); 218 219/* Only intended to be called from a debugger. */ 220extern void mmix_dump_bpo_gregs 221 PARAMS ((struct bfd_link_info *, bfd_error_handler_type)); 222 223static void 224mmix_set_relaxable_size 225 PARAMS ((bfd *, asection *, void *)); 226 227 228/* Watch out: this currently needs to have elements with the same index as 229 their R_MMIX_ number. */ 230static reloc_howto_type elf_mmix_howto_table[] = 231 { 232 /* This reloc does nothing. */ 233 HOWTO (R_MMIX_NONE, /* type */ 234 0, /* rightshift */ 235 2, /* size (0 = byte, 1 = short, 2 = long) */ 236 32, /* bitsize */ 237 FALSE, /* pc_relative */ 238 0, /* bitpos */ 239 complain_overflow_bitfield, /* complain_on_overflow */ 240 bfd_elf_generic_reloc, /* special_function */ 241 "R_MMIX_NONE", /* name */ 242 FALSE, /* partial_inplace */ 243 0, /* src_mask */ 244 0, /* dst_mask */ 245 FALSE), /* pcrel_offset */ 246 247 /* An 8 bit absolute relocation. */ 248 HOWTO (R_MMIX_8, /* type */ 249 0, /* rightshift */ 250 0, /* size (0 = byte, 1 = short, 2 = long) */ 251 8, /* bitsize */ 252 FALSE, /* pc_relative */ 253 0, /* bitpos */ 254 complain_overflow_bitfield, /* complain_on_overflow */ 255 bfd_elf_generic_reloc, /* special_function */ 256 "R_MMIX_8", /* name */ 257 FALSE, /* partial_inplace */ 258 0, /* src_mask */ 259 0xff, /* dst_mask */ 260 FALSE), /* pcrel_offset */ 261 262 /* An 16 bit absolute relocation. */ 263 HOWTO (R_MMIX_16, /* type */ 264 0, /* rightshift */ 265 1, /* size (0 = byte, 1 = short, 2 = long) */ 266 16, /* bitsize */ 267 FALSE, /* pc_relative */ 268 0, /* bitpos */ 269 complain_overflow_bitfield, /* complain_on_overflow */ 270 bfd_elf_generic_reloc, /* special_function */ 271 "R_MMIX_16", /* name */ 272 FALSE, /* partial_inplace */ 273 0, /* src_mask */ 274 0xffff, /* dst_mask */ 275 FALSE), /* pcrel_offset */ 276 277 /* An 24 bit absolute relocation. */ 278 HOWTO (R_MMIX_24, /* type */ 279 0, /* rightshift */ 280 2, /* size (0 = byte, 1 = short, 2 = long) */ 281 24, /* bitsize */ 282 FALSE, /* pc_relative */ 283 0, /* bitpos */ 284 complain_overflow_bitfield, /* complain_on_overflow */ 285 bfd_elf_generic_reloc, /* special_function */ 286 "R_MMIX_24", /* name */ 287 FALSE, /* partial_inplace */ 288 ~0xffffff, /* src_mask */ 289 0xffffff, /* dst_mask */ 290 FALSE), /* pcrel_offset */ 291 292 /* A 32 bit absolute relocation. */ 293 HOWTO (R_MMIX_32, /* type */ 294 0, /* rightshift */ 295 2, /* size (0 = byte, 1 = short, 2 = long) */ 296 32, /* bitsize */ 297 FALSE, /* pc_relative */ 298 0, /* bitpos */ 299 complain_overflow_bitfield, /* complain_on_overflow */ 300 bfd_elf_generic_reloc, /* special_function */ 301 "R_MMIX_32", /* name */ 302 FALSE, /* partial_inplace */ 303 0, /* src_mask */ 304 0xffffffff, /* dst_mask */ 305 FALSE), /* pcrel_offset */ 306 307 /* 64 bit relocation. */ 308 HOWTO (R_MMIX_64, /* type */ 309 0, /* rightshift */ 310 4, /* size (0 = byte, 1 = short, 2 = long) */ 311 64, /* bitsize */ 312 FALSE, /* pc_relative */ 313 0, /* bitpos */ 314 complain_overflow_bitfield, /* complain_on_overflow */ 315 bfd_elf_generic_reloc, /* special_function */ 316 "R_MMIX_64", /* name */ 317 FALSE, /* partial_inplace */ 318 0, /* src_mask */ 319 MINUS_ONE, /* dst_mask */ 320 FALSE), /* pcrel_offset */ 321 322 /* An 8 bit PC-relative relocation. */ 323 HOWTO (R_MMIX_PC_8, /* type */ 324 0, /* rightshift */ 325 0, /* size (0 = byte, 1 = short, 2 = long) */ 326 8, /* bitsize */ 327 TRUE, /* pc_relative */ 328 0, /* bitpos */ 329 complain_overflow_bitfield, /* complain_on_overflow */ 330 bfd_elf_generic_reloc, /* special_function */ 331 "R_MMIX_PC_8", /* name */ 332 FALSE, /* partial_inplace */ 333 0, /* src_mask */ 334 0xff, /* dst_mask */ 335 TRUE), /* pcrel_offset */ 336 337 /* An 16 bit PC-relative relocation. */ 338 HOWTO (R_MMIX_PC_16, /* type */ 339 0, /* rightshift */ 340 1, /* size (0 = byte, 1 = short, 2 = long) */ 341 16, /* bitsize */ 342 TRUE, /* pc_relative */ 343 0, /* bitpos */ 344 complain_overflow_bitfield, /* complain_on_overflow */ 345 bfd_elf_generic_reloc, /* special_function */ 346 "R_MMIX_PC_16", /* name */ 347 FALSE, /* partial_inplace */ 348 0, /* src_mask */ 349 0xffff, /* dst_mask */ 350 TRUE), /* pcrel_offset */ 351 352 /* An 24 bit PC-relative relocation. */ 353 HOWTO (R_MMIX_PC_24, /* type */ 354 0, /* rightshift */ 355 2, /* size (0 = byte, 1 = short, 2 = long) */ 356 24, /* bitsize */ 357 TRUE, /* pc_relative */ 358 0, /* bitpos */ 359 complain_overflow_bitfield, /* complain_on_overflow */ 360 bfd_elf_generic_reloc, /* special_function */ 361 "R_MMIX_PC_24", /* name */ 362 FALSE, /* partial_inplace */ 363 ~0xffffff, /* src_mask */ 364 0xffffff, /* dst_mask */ 365 TRUE), /* pcrel_offset */ 366 367 /* A 32 bit absolute PC-relative relocation. */ 368 HOWTO (R_MMIX_PC_32, /* type */ 369 0, /* rightshift */ 370 2, /* size (0 = byte, 1 = short, 2 = long) */ 371 32, /* bitsize */ 372 TRUE, /* pc_relative */ 373 0, /* bitpos */ 374 complain_overflow_bitfield, /* complain_on_overflow */ 375 bfd_elf_generic_reloc, /* special_function */ 376 "R_MMIX_PC_32", /* name */ 377 FALSE, /* partial_inplace */ 378 0, /* src_mask */ 379 0xffffffff, /* dst_mask */ 380 TRUE), /* pcrel_offset */ 381 382 /* 64 bit PC-relative relocation. */ 383 HOWTO (R_MMIX_PC_64, /* type */ 384 0, /* rightshift */ 385 4, /* size (0 = byte, 1 = short, 2 = long) */ 386 64, /* bitsize */ 387 TRUE, /* pc_relative */ 388 0, /* bitpos */ 389 complain_overflow_bitfield, /* complain_on_overflow */ 390 bfd_elf_generic_reloc, /* special_function */ 391 "R_MMIX_PC_64", /* name */ 392 FALSE, /* partial_inplace */ 393 0, /* src_mask */ 394 MINUS_ONE, /* dst_mask */ 395 TRUE), /* pcrel_offset */ 396 397 /* GNU extension to record C++ vtable hierarchy. */ 398 HOWTO (R_MMIX_GNU_VTINHERIT, /* type */ 399 0, /* rightshift */ 400 0, /* size (0 = byte, 1 = short, 2 = long) */ 401 0, /* bitsize */ 402 FALSE, /* pc_relative */ 403 0, /* bitpos */ 404 complain_overflow_dont, /* complain_on_overflow */ 405 NULL, /* special_function */ 406 "R_MMIX_GNU_VTINHERIT", /* name */ 407 FALSE, /* partial_inplace */ 408 0, /* src_mask */ 409 0, /* dst_mask */ 410 TRUE), /* pcrel_offset */ 411 412 /* GNU extension to record C++ vtable member usage. */ 413 HOWTO (R_MMIX_GNU_VTENTRY, /* type */ 414 0, /* rightshift */ 415 0, /* size (0 = byte, 1 = short, 2 = long) */ 416 0, /* bitsize */ 417 FALSE, /* pc_relative */ 418 0, /* bitpos */ 419 complain_overflow_dont, /* complain_on_overflow */ 420 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 421 "R_MMIX_GNU_VTENTRY", /* name */ 422 FALSE, /* partial_inplace */ 423 0, /* src_mask */ 424 0, /* dst_mask */ 425 FALSE), /* pcrel_offset */ 426 427 /* The GETA relocation is supposed to get any address that could 428 possibly be reached by the GETA instruction. It can silently expand 429 to get a 64-bit operand, but will complain if any of the two least 430 significant bits are set. The howto members reflect a simple GETA. */ 431 HOWTO (R_MMIX_GETA, /* type */ 432 2, /* rightshift */ 433 2, /* size (0 = byte, 1 = short, 2 = long) */ 434 19, /* bitsize */ 435 TRUE, /* pc_relative */ 436 0, /* bitpos */ 437 complain_overflow_signed, /* complain_on_overflow */ 438 mmix_elf_reloc, /* special_function */ 439 "R_MMIX_GETA", /* name */ 440 FALSE, /* partial_inplace */ 441 ~0x0100ffff, /* src_mask */ 442 0x0100ffff, /* dst_mask */ 443 TRUE), /* pcrel_offset */ 444 445 HOWTO (R_MMIX_GETA_1, /* type */ 446 2, /* rightshift */ 447 2, /* size (0 = byte, 1 = short, 2 = long) */ 448 19, /* bitsize */ 449 TRUE, /* pc_relative */ 450 0, /* bitpos */ 451 complain_overflow_signed, /* complain_on_overflow */ 452 mmix_elf_reloc, /* special_function */ 453 "R_MMIX_GETA_1", /* name */ 454 FALSE, /* partial_inplace */ 455 ~0x0100ffff, /* src_mask */ 456 0x0100ffff, /* dst_mask */ 457 TRUE), /* pcrel_offset */ 458 459 HOWTO (R_MMIX_GETA_2, /* type */ 460 2, /* rightshift */ 461 2, /* size (0 = byte, 1 = short, 2 = long) */ 462 19, /* bitsize */ 463 TRUE, /* pc_relative */ 464 0, /* bitpos */ 465 complain_overflow_signed, /* complain_on_overflow */ 466 mmix_elf_reloc, /* special_function */ 467 "R_MMIX_GETA_2", /* name */ 468 FALSE, /* partial_inplace */ 469 ~0x0100ffff, /* src_mask */ 470 0x0100ffff, /* dst_mask */ 471 TRUE), /* pcrel_offset */ 472 473 HOWTO (R_MMIX_GETA_3, /* type */ 474 2, /* rightshift */ 475 2, /* size (0 = byte, 1 = short, 2 = long) */ 476 19, /* bitsize */ 477 TRUE, /* pc_relative */ 478 0, /* bitpos */ 479 complain_overflow_signed, /* complain_on_overflow */ 480 mmix_elf_reloc, /* special_function */ 481 "R_MMIX_GETA_3", /* name */ 482 FALSE, /* partial_inplace */ 483 ~0x0100ffff, /* src_mask */ 484 0x0100ffff, /* dst_mask */ 485 TRUE), /* pcrel_offset */ 486 487 /* The conditional branches are supposed to reach any (code) address. 488 It can silently expand to a 64-bit operand, but will emit an error if 489 any of the two least significant bits are set. The howto members 490 reflect a simple branch. */ 491 HOWTO (R_MMIX_CBRANCH, /* type */ 492 2, /* rightshift */ 493 2, /* size (0 = byte, 1 = short, 2 = long) */ 494 19, /* bitsize */ 495 TRUE, /* pc_relative */ 496 0, /* bitpos */ 497 complain_overflow_signed, /* complain_on_overflow */ 498 mmix_elf_reloc, /* special_function */ 499 "R_MMIX_CBRANCH", /* name */ 500 FALSE, /* partial_inplace */ 501 ~0x0100ffff, /* src_mask */ 502 0x0100ffff, /* dst_mask */ 503 TRUE), /* pcrel_offset */ 504 505 HOWTO (R_MMIX_CBRANCH_J, /* type */ 506 2, /* rightshift */ 507 2, /* size (0 = byte, 1 = short, 2 = long) */ 508 19, /* bitsize */ 509 TRUE, /* pc_relative */ 510 0, /* bitpos */ 511 complain_overflow_signed, /* complain_on_overflow */ 512 mmix_elf_reloc, /* special_function */ 513 "R_MMIX_CBRANCH_J", /* name */ 514 FALSE, /* partial_inplace */ 515 ~0x0100ffff, /* src_mask */ 516 0x0100ffff, /* dst_mask */ 517 TRUE), /* pcrel_offset */ 518 519 HOWTO (R_MMIX_CBRANCH_1, /* type */ 520 2, /* rightshift */ 521 2, /* size (0 = byte, 1 = short, 2 = long) */ 522 19, /* bitsize */ 523 TRUE, /* pc_relative */ 524 0, /* bitpos */ 525 complain_overflow_signed, /* complain_on_overflow */ 526 mmix_elf_reloc, /* special_function */ 527 "R_MMIX_CBRANCH_1", /* name */ 528 FALSE, /* partial_inplace */ 529 ~0x0100ffff, /* src_mask */ 530 0x0100ffff, /* dst_mask */ 531 TRUE), /* pcrel_offset */ 532 533 HOWTO (R_MMIX_CBRANCH_2, /* type */ 534 2, /* rightshift */ 535 2, /* size (0 = byte, 1 = short, 2 = long) */ 536 19, /* bitsize */ 537 TRUE, /* pc_relative */ 538 0, /* bitpos */ 539 complain_overflow_signed, /* complain_on_overflow */ 540 mmix_elf_reloc, /* special_function */ 541 "R_MMIX_CBRANCH_2", /* name */ 542 FALSE, /* partial_inplace */ 543 ~0x0100ffff, /* src_mask */ 544 0x0100ffff, /* dst_mask */ 545 TRUE), /* pcrel_offset */ 546 547 HOWTO (R_MMIX_CBRANCH_3, /* type */ 548 2, /* rightshift */ 549 2, /* size (0 = byte, 1 = short, 2 = long) */ 550 19, /* bitsize */ 551 TRUE, /* pc_relative */ 552 0, /* bitpos */ 553 complain_overflow_signed, /* complain_on_overflow */ 554 mmix_elf_reloc, /* special_function */ 555 "R_MMIX_CBRANCH_3", /* name */ 556 FALSE, /* partial_inplace */ 557 ~0x0100ffff, /* src_mask */ 558 0x0100ffff, /* dst_mask */ 559 TRUE), /* pcrel_offset */ 560 561 /* The PUSHJ instruction can reach any (code) address, as long as it's 562 the beginning of a function (no usable restriction). It can silently 563 expand to a 64-bit operand, but will emit an error if any of the two 564 least significant bits are set. It can also expand into a call to a 565 stub; see R_MMIX_PUSHJ_STUBBABLE. The howto members reflect a simple 566 PUSHJ. */ 567 HOWTO (R_MMIX_PUSHJ, /* type */ 568 2, /* rightshift */ 569 2, /* size (0 = byte, 1 = short, 2 = long) */ 570 19, /* bitsize */ 571 TRUE, /* pc_relative */ 572 0, /* bitpos */ 573 complain_overflow_signed, /* complain_on_overflow */ 574 mmix_elf_reloc, /* special_function */ 575 "R_MMIX_PUSHJ", /* name */ 576 FALSE, /* partial_inplace */ 577 ~0x0100ffff, /* src_mask */ 578 0x0100ffff, /* dst_mask */ 579 TRUE), /* pcrel_offset */ 580 581 HOWTO (R_MMIX_PUSHJ_1, /* type */ 582 2, /* rightshift */ 583 2, /* size (0 = byte, 1 = short, 2 = long) */ 584 19, /* bitsize */ 585 TRUE, /* pc_relative */ 586 0, /* bitpos */ 587 complain_overflow_signed, /* complain_on_overflow */ 588 mmix_elf_reloc, /* special_function */ 589 "R_MMIX_PUSHJ_1", /* name */ 590 FALSE, /* partial_inplace */ 591 ~0x0100ffff, /* src_mask */ 592 0x0100ffff, /* dst_mask */ 593 TRUE), /* pcrel_offset */ 594 595 HOWTO (R_MMIX_PUSHJ_2, /* type */ 596 2, /* rightshift */ 597 2, /* size (0 = byte, 1 = short, 2 = long) */ 598 19, /* bitsize */ 599 TRUE, /* pc_relative */ 600 0, /* bitpos */ 601 complain_overflow_signed, /* complain_on_overflow */ 602 mmix_elf_reloc, /* special_function */ 603 "R_MMIX_PUSHJ_2", /* name */ 604 FALSE, /* partial_inplace */ 605 ~0x0100ffff, /* src_mask */ 606 0x0100ffff, /* dst_mask */ 607 TRUE), /* pcrel_offset */ 608 609 HOWTO (R_MMIX_PUSHJ_3, /* type */ 610 2, /* rightshift */ 611 2, /* size (0 = byte, 1 = short, 2 = long) */ 612 19, /* bitsize */ 613 TRUE, /* pc_relative */ 614 0, /* bitpos */ 615 complain_overflow_signed, /* complain_on_overflow */ 616 mmix_elf_reloc, /* special_function */ 617 "R_MMIX_PUSHJ_3", /* name */ 618 FALSE, /* partial_inplace */ 619 ~0x0100ffff, /* src_mask */ 620 0x0100ffff, /* dst_mask */ 621 TRUE), /* pcrel_offset */ 622 623 /* A JMP is supposed to reach any (code) address. By itself, it can 624 reach +-64M; the expansion can reach all 64 bits. Note that the 64M 625 limit is soon reached if you link the program in wildly different 626 memory segments. The howto members reflect a trivial JMP. */ 627 HOWTO (R_MMIX_JMP, /* type */ 628 2, /* rightshift */ 629 2, /* size (0 = byte, 1 = short, 2 = long) */ 630 27, /* bitsize */ 631 TRUE, /* pc_relative */ 632 0, /* bitpos */ 633 complain_overflow_signed, /* complain_on_overflow */ 634 mmix_elf_reloc, /* special_function */ 635 "R_MMIX_JMP", /* name */ 636 FALSE, /* partial_inplace */ 637 ~0x1ffffff, /* src_mask */ 638 0x1ffffff, /* dst_mask */ 639 TRUE), /* pcrel_offset */ 640 641 HOWTO (R_MMIX_JMP_1, /* type */ 642 2, /* rightshift */ 643 2, /* size (0 = byte, 1 = short, 2 = long) */ 644 27, /* bitsize */ 645 TRUE, /* pc_relative */ 646 0, /* bitpos */ 647 complain_overflow_signed, /* complain_on_overflow */ 648 mmix_elf_reloc, /* special_function */ 649 "R_MMIX_JMP_1", /* name */ 650 FALSE, /* partial_inplace */ 651 ~0x1ffffff, /* src_mask */ 652 0x1ffffff, /* dst_mask */ 653 TRUE), /* pcrel_offset */ 654 655 HOWTO (R_MMIX_JMP_2, /* type */ 656 2, /* rightshift */ 657 2, /* size (0 = byte, 1 = short, 2 = long) */ 658 27, /* bitsize */ 659 TRUE, /* pc_relative */ 660 0, /* bitpos */ 661 complain_overflow_signed, /* complain_on_overflow */ 662 mmix_elf_reloc, /* special_function */ 663 "R_MMIX_JMP_2", /* name */ 664 FALSE, /* partial_inplace */ 665 ~0x1ffffff, /* src_mask */ 666 0x1ffffff, /* dst_mask */ 667 TRUE), /* pcrel_offset */ 668 669 HOWTO (R_MMIX_JMP_3, /* type */ 670 2, /* rightshift */ 671 2, /* size (0 = byte, 1 = short, 2 = long) */ 672 27, /* bitsize */ 673 TRUE, /* pc_relative */ 674 0, /* bitpos */ 675 complain_overflow_signed, /* complain_on_overflow */ 676 mmix_elf_reloc, /* special_function */ 677 "R_MMIX_JMP_3", /* name */ 678 FALSE, /* partial_inplace */ 679 ~0x1ffffff, /* src_mask */ 680 0x1ffffff, /* dst_mask */ 681 TRUE), /* pcrel_offset */ 682 683 /* When we don't emit link-time-relaxable code from the assembler, or 684 when relaxation has done all it can do, these relocs are used. For 685 GETA/PUSHJ/branches. */ 686 HOWTO (R_MMIX_ADDR19, /* type */ 687 2, /* rightshift */ 688 2, /* size (0 = byte, 1 = short, 2 = long) */ 689 19, /* bitsize */ 690 TRUE, /* pc_relative */ 691 0, /* bitpos */ 692 complain_overflow_signed, /* complain_on_overflow */ 693 mmix_elf_reloc, /* special_function */ 694 "R_MMIX_ADDR19", /* name */ 695 FALSE, /* partial_inplace */ 696 ~0x0100ffff, /* src_mask */ 697 0x0100ffff, /* dst_mask */ 698 TRUE), /* pcrel_offset */ 699 700 /* For JMP. */ 701 HOWTO (R_MMIX_ADDR27, /* type */ 702 2, /* rightshift */ 703 2, /* size (0 = byte, 1 = short, 2 = long) */ 704 27, /* bitsize */ 705 TRUE, /* pc_relative */ 706 0, /* bitpos */ 707 complain_overflow_signed, /* complain_on_overflow */ 708 mmix_elf_reloc, /* special_function */ 709 "R_MMIX_ADDR27", /* name */ 710 FALSE, /* partial_inplace */ 711 ~0x1ffffff, /* src_mask */ 712 0x1ffffff, /* dst_mask */ 713 TRUE), /* pcrel_offset */ 714 715 /* A general register or the value 0..255. If a value, then the 716 instruction (offset -3) needs adjusting. */ 717 HOWTO (R_MMIX_REG_OR_BYTE, /* type */ 718 0, /* rightshift */ 719 1, /* size (0 = byte, 1 = short, 2 = long) */ 720 8, /* bitsize */ 721 FALSE, /* pc_relative */ 722 0, /* bitpos */ 723 complain_overflow_bitfield, /* complain_on_overflow */ 724 mmix_elf_reloc, /* special_function */ 725 "R_MMIX_REG_OR_BYTE", /* name */ 726 FALSE, /* partial_inplace */ 727 0, /* src_mask */ 728 0xff, /* dst_mask */ 729 FALSE), /* pcrel_offset */ 730 731 /* A general register. */ 732 HOWTO (R_MMIX_REG, /* type */ 733 0, /* rightshift */ 734 1, /* size (0 = byte, 1 = short, 2 = long) */ 735 8, /* bitsize */ 736 FALSE, /* pc_relative */ 737 0, /* bitpos */ 738 complain_overflow_bitfield, /* complain_on_overflow */ 739 mmix_elf_reloc, /* special_function */ 740 "R_MMIX_REG", /* name */ 741 FALSE, /* partial_inplace */ 742 0, /* src_mask */ 743 0xff, /* dst_mask */ 744 FALSE), /* pcrel_offset */ 745 746 /* A register plus an index, corresponding to the relocation expression. 747 The sizes must correspond to the valid range of the expression, while 748 the bitmasks correspond to what we store in the image. */ 749 HOWTO (R_MMIX_BASE_PLUS_OFFSET, /* type */ 750 0, /* rightshift */ 751 4, /* size (0 = byte, 1 = short, 2 = long) */ 752 64, /* bitsize */ 753 FALSE, /* pc_relative */ 754 0, /* bitpos */ 755 complain_overflow_bitfield, /* complain_on_overflow */ 756 mmix_elf_reloc, /* special_function */ 757 "R_MMIX_BASE_PLUS_OFFSET", /* name */ 758 FALSE, /* partial_inplace */ 759 0, /* src_mask */ 760 0xffff, /* dst_mask */ 761 FALSE), /* pcrel_offset */ 762 763 /* A "magic" relocation for a LOCAL expression, asserting that the 764 expression is less than the number of global registers. No actual 765 modification of the contents is done. Implementing this as a 766 relocation was less intrusive than e.g. putting such expressions in a 767 section to discard *after* relocation. */ 768 HOWTO (R_MMIX_LOCAL, /* type */ 769 0, /* rightshift */ 770 0, /* size (0 = byte, 1 = short, 2 = long) */ 771 0, /* bitsize */ 772 FALSE, /* pc_relative */ 773 0, /* bitpos */ 774 complain_overflow_dont, /* complain_on_overflow */ 775 mmix_elf_reloc, /* special_function */ 776 "R_MMIX_LOCAL", /* name */ 777 FALSE, /* partial_inplace */ 778 0, /* src_mask */ 779 0, /* dst_mask */ 780 FALSE), /* pcrel_offset */ 781 782 HOWTO (R_MMIX_PUSHJ_STUBBABLE, /* type */ 783 2, /* rightshift */ 784 2, /* size (0 = byte, 1 = short, 2 = long) */ 785 19, /* bitsize */ 786 TRUE, /* pc_relative */ 787 0, /* bitpos */ 788 complain_overflow_signed, /* complain_on_overflow */ 789 mmix_elf_reloc, /* special_function */ 790 "R_MMIX_PUSHJ_STUBBABLE", /* name */ 791 FALSE, /* partial_inplace */ 792 ~0x0100ffff, /* src_mask */ 793 0x0100ffff, /* dst_mask */ 794 TRUE) /* pcrel_offset */ 795 }; 796 797 798/* Map BFD reloc types to MMIX ELF reloc types. */ 799 800struct mmix_reloc_map 801 { 802 bfd_reloc_code_real_type bfd_reloc_val; 803 enum elf_mmix_reloc_type elf_reloc_val; 804 }; 805 806 807static const struct mmix_reloc_map mmix_reloc_map[] = 808 { 809 {BFD_RELOC_NONE, R_MMIX_NONE}, 810 {BFD_RELOC_8, R_MMIX_8}, 811 {BFD_RELOC_16, R_MMIX_16}, 812 {BFD_RELOC_24, R_MMIX_24}, 813 {BFD_RELOC_32, R_MMIX_32}, 814 {BFD_RELOC_64, R_MMIX_64}, 815 {BFD_RELOC_8_PCREL, R_MMIX_PC_8}, 816 {BFD_RELOC_16_PCREL, R_MMIX_PC_16}, 817 {BFD_RELOC_24_PCREL, R_MMIX_PC_24}, 818 {BFD_RELOC_32_PCREL, R_MMIX_PC_32}, 819 {BFD_RELOC_64_PCREL, R_MMIX_PC_64}, 820 {BFD_RELOC_VTABLE_INHERIT, R_MMIX_GNU_VTINHERIT}, 821 {BFD_RELOC_VTABLE_ENTRY, R_MMIX_GNU_VTENTRY}, 822 {BFD_RELOC_MMIX_GETA, R_MMIX_GETA}, 823 {BFD_RELOC_MMIX_CBRANCH, R_MMIX_CBRANCH}, 824 {BFD_RELOC_MMIX_PUSHJ, R_MMIX_PUSHJ}, 825 {BFD_RELOC_MMIX_JMP, R_MMIX_JMP}, 826 {BFD_RELOC_MMIX_ADDR19, R_MMIX_ADDR19}, 827 {BFD_RELOC_MMIX_ADDR27, R_MMIX_ADDR27}, 828 {BFD_RELOC_MMIX_REG_OR_BYTE, R_MMIX_REG_OR_BYTE}, 829 {BFD_RELOC_MMIX_REG, R_MMIX_REG}, 830 {BFD_RELOC_MMIX_BASE_PLUS_OFFSET, R_MMIX_BASE_PLUS_OFFSET}, 831 {BFD_RELOC_MMIX_LOCAL, R_MMIX_LOCAL}, 832 {BFD_RELOC_MMIX_PUSHJ_STUBBABLE, R_MMIX_PUSHJ_STUBBABLE} 833 }; 834 835static reloc_howto_type * 836bfd_elf64_bfd_reloc_type_lookup (abfd, code) 837 bfd *abfd ATTRIBUTE_UNUSED; 838 bfd_reloc_code_real_type code; 839{ 840 unsigned int i; 841 842 for (i = 0; 843 i < sizeof (mmix_reloc_map) / sizeof (mmix_reloc_map[0]); 844 i++) 845 { 846 if (mmix_reloc_map[i].bfd_reloc_val == code) 847 return &elf_mmix_howto_table[mmix_reloc_map[i].elf_reloc_val]; 848 } 849 850 return NULL; 851} 852 853static reloc_howto_type * 854bfd_elf64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 855 const char *r_name) 856{ 857 unsigned int i; 858 859 for (i = 0; 860 i < sizeof (elf_mmix_howto_table) / sizeof (elf_mmix_howto_table[0]); 861 i++) 862 if (elf_mmix_howto_table[i].name != NULL 863 && strcasecmp (elf_mmix_howto_table[i].name, r_name) == 0) 864 return &elf_mmix_howto_table[i]; 865 866 return NULL; 867} 868 869static bfd_boolean 870mmix_elf_new_section_hook (abfd, sec) 871 bfd *abfd; 872 asection *sec; 873{ 874 if (!sec->used_by_bfd) 875 { 876 struct _mmix_elf_section_data *sdata; 877 bfd_size_type amt = sizeof (*sdata); 878 879 sdata = bfd_zalloc (abfd, amt); 880 if (sdata == NULL) 881 return FALSE; 882 sec->used_by_bfd = sdata; 883 } 884 885 return _bfd_elf_new_section_hook (abfd, sec); 886} 887 888 889/* This function performs the actual bitfiddling and sanity check for a 890 final relocation. Each relocation gets its *worst*-case expansion 891 in size when it arrives here; any reduction in size should have been 892 caught in linker relaxation earlier. When we get here, the relocation 893 looks like the smallest instruction with SWYM:s (nop:s) appended to the 894 max size. We fill in those nop:s. 895 896 R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra) 897 GETA $N,foo 898 -> 899 SETL $N,foo & 0xffff 900 INCML $N,(foo >> 16) & 0xffff 901 INCMH $N,(foo >> 32) & 0xffff 902 INCH $N,(foo >> 48) & 0xffff 903 904 R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but 905 condbranches needing relaxation might be rare enough to not be 906 worthwhile.) 907 [P]Bcc $N,foo 908 -> 909 [~P]B~cc $N,.+20 910 SETL $255,foo & ... 911 INCML ... 912 INCMH ... 913 INCH ... 914 GO $255,$255,0 915 916 R_MMIX_PUSHJ: (FIXME: Relaxation...) 917 PUSHJ $N,foo 918 -> 919 SETL $255,foo & ... 920 INCML ... 921 INCMH ... 922 INCH ... 923 PUSHGO $N,$255,0 924 925 R_MMIX_JMP: (FIXME: Relaxation...) 926 JMP foo 927 -> 928 SETL $255,foo & ... 929 INCML ... 930 INCMH ... 931 INCH ... 932 GO $255,$255,0 933 934 R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */ 935 936static bfd_reloc_status_type 937mmix_elf_perform_relocation (isec, howto, datap, addr, value) 938 asection *isec; 939 reloc_howto_type *howto; 940 PTR datap; 941 bfd_vma addr; 942 bfd_vma value; 943{ 944 bfd *abfd = isec->owner; 945 bfd_reloc_status_type flag = bfd_reloc_ok; 946 bfd_reloc_status_type r; 947 int offs = 0; 948 int reg = 255; 949 950 /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences. 951 We handle the differences here and the common sequence later. */ 952 switch (howto->type) 953 { 954 case R_MMIX_GETA: 955 offs = 0; 956 reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 957 958 /* We change to an absolute value. */ 959 value += addr; 960 break; 961 962 case R_MMIX_CBRANCH: 963 { 964 int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16; 965 966 /* Invert the condition and prediction bit, and set the offset 967 to five instructions ahead. 968 969 We *can* do better if we want to. If the branch is found to be 970 within limits, we could leave the branch as is; there'll just 971 be a bunch of NOP:s after it. But we shouldn't see this 972 sequence often enough that it's worth doing it. */ 973 974 bfd_put_32 (abfd, 975 (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff) 976 | (24/4)), 977 (bfd_byte *) datap); 978 979 /* Put a "GO $255,$255,0" after the common sequence. */ 980 bfd_put_32 (abfd, 981 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00, 982 (bfd_byte *) datap + 20); 983 984 /* Common sequence starts at offset 4. */ 985 offs = 4; 986 987 /* We change to an absolute value. */ 988 value += addr; 989 } 990 break; 991 992 case R_MMIX_PUSHJ_STUBBABLE: 993 /* If the address fits, we're fine. */ 994 if ((value & 3) == 0 995 /* Note rightshift 0; see R_MMIX_JMP case below. */ 996 && (r = bfd_check_overflow (complain_overflow_signed, 997 howto->bitsize, 998 0, 999 bfd_arch_bits_per_address (abfd), 1000 value)) == bfd_reloc_ok) 1001 goto pcrel_mmix_reloc_fits; 1002 else 1003 { 1004 bfd_size_type size = isec->rawsize ? isec->rawsize : isec->size; 1005 1006 /* We have the bytes at the PUSHJ insn and need to get the 1007 position for the stub. There's supposed to be room allocated 1008 for the stub. */ 1009 bfd_byte *stubcontents 1010 = ((bfd_byte *) datap 1011 - (addr - (isec->output_section->vma + isec->output_offset)) 1012 + size 1013 + mmix_elf_section_data (isec)->pjs.stub_offset); 1014 bfd_vma stubaddr; 1015 1016 /* The address doesn't fit, so redirect the PUSHJ to the 1017 location of the stub. */ 1018 r = mmix_elf_perform_relocation (isec, 1019 &elf_mmix_howto_table 1020 [R_MMIX_ADDR19], 1021 datap, 1022 addr, 1023 isec->output_section->vma 1024 + isec->output_offset 1025 + size 1026 + (mmix_elf_section_data (isec) 1027 ->pjs.stub_offset) 1028 - addr); 1029 if (r != bfd_reloc_ok) 1030 return r; 1031 1032 stubaddr 1033 = (isec->output_section->vma 1034 + isec->output_offset 1035 + size 1036 + mmix_elf_section_data (isec)->pjs.stub_offset); 1037 1038 /* We generate a simple JMP if that suffices, else the whole 5 1039 insn stub. */ 1040 if (bfd_check_overflow (complain_overflow_signed, 1041 elf_mmix_howto_table[R_MMIX_ADDR27].bitsize, 1042 0, 1043 bfd_arch_bits_per_address (abfd), 1044 addr + value - stubaddr) == bfd_reloc_ok) 1045 { 1046 bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents); 1047 r = mmix_elf_perform_relocation (isec, 1048 &elf_mmix_howto_table 1049 [R_MMIX_ADDR27], 1050 stubcontents, 1051 stubaddr, 1052 value + addr - stubaddr); 1053 mmix_elf_section_data (isec)->pjs.stub_offset += 4; 1054 1055 if (size + mmix_elf_section_data (isec)->pjs.stub_offset 1056 > isec->size) 1057 abort (); 1058 1059 return r; 1060 } 1061 else 1062 { 1063 /* Put a "GO $255,0" after the common sequence. */ 1064 bfd_put_32 (abfd, 1065 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1066 | 0xff00, (bfd_byte *) stubcontents + 16); 1067 1068 /* Prepare for the general code to set the first part of the 1069 linker stub, and */ 1070 value += addr; 1071 datap = stubcontents; 1072 mmix_elf_section_data (isec)->pjs.stub_offset 1073 += MAX_PUSHJ_STUB_SIZE; 1074 } 1075 } 1076 break; 1077 1078 case R_MMIX_PUSHJ: 1079 { 1080 int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 1081 1082 /* Put a "PUSHGO $N,$255,0" after the common sequence. */ 1083 bfd_put_32 (abfd, 1084 ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1085 | (inreg << 16) 1086 | 0xff00, 1087 (bfd_byte *) datap + 16); 1088 1089 /* We change to an absolute value. */ 1090 value += addr; 1091 } 1092 break; 1093 1094 case R_MMIX_JMP: 1095 /* This one is a little special. If we get here on a non-relaxing 1096 link, and the destination is actually in range, we don't need to 1097 execute the nops. 1098 If so, we fall through to the bit-fiddling relocs. 1099 1100 FIXME: bfd_check_overflow seems broken; the relocation is 1101 rightshifted before testing, so supply a zero rightshift. */ 1102 1103 if (! ((value & 3) == 0 1104 && (r = bfd_check_overflow (complain_overflow_signed, 1105 howto->bitsize, 1106 0, 1107 bfd_arch_bits_per_address (abfd), 1108 value)) == bfd_reloc_ok)) 1109 { 1110 /* If the relocation doesn't fit in a JMP, we let the NOP:s be 1111 modified below, and put a "GO $255,$255,0" after the 1112 address-loading sequence. */ 1113 bfd_put_32 (abfd, 1114 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1115 | 0xffff00, 1116 (bfd_byte *) datap + 16); 1117 1118 /* We change to an absolute value. */ 1119 value += addr; 1120 break; 1121 } 1122 /* FALLTHROUGH. */ 1123 case R_MMIX_ADDR19: 1124 case R_MMIX_ADDR27: 1125 pcrel_mmix_reloc_fits: 1126 /* These must be in range, or else we emit an error. */ 1127 if ((value & 3) == 0 1128 /* Note rightshift 0; see above. */ 1129 && (r = bfd_check_overflow (complain_overflow_signed, 1130 howto->bitsize, 1131 0, 1132 bfd_arch_bits_per_address (abfd), 1133 value)) == bfd_reloc_ok) 1134 { 1135 bfd_vma in1 1136 = bfd_get_32 (abfd, (bfd_byte *) datap); 1137 bfd_vma highbit; 1138 1139 if ((bfd_signed_vma) value < 0) 1140 { 1141 highbit = 1 << 24; 1142 value += (1 << (howto->bitsize - 1)); 1143 } 1144 else 1145 highbit = 0; 1146 1147 value >>= 2; 1148 1149 bfd_put_32 (abfd, 1150 (in1 & howto->src_mask) 1151 | highbit 1152 | (value & howto->dst_mask), 1153 (bfd_byte *) datap); 1154 1155 return bfd_reloc_ok; 1156 } 1157 else 1158 return bfd_reloc_overflow; 1159 1160 case R_MMIX_BASE_PLUS_OFFSET: 1161 { 1162 struct bpo_reloc_section_info *bpodata 1163 = mmix_elf_section_data (isec)->bpo.reloc; 1164 asection *bpo_greg_section 1165 = bpodata->bpo_greg_section; 1166 struct bpo_greg_section_info *gregdata 1167 = mmix_elf_section_data (bpo_greg_section)->bpo.greg; 1168 size_t bpo_index 1169 = gregdata->bpo_reloc_indexes[bpodata->bpo_index++]; 1170 1171 /* A consistency check: The value we now have in "relocation" must 1172 be the same as the value we stored for that relocation. It 1173 doesn't cost much, so can be left in at all times. */ 1174 if (value != gregdata->reloc_request[bpo_index].value) 1175 { 1176 (*_bfd_error_handler) 1177 (_("%s: Internal inconsistency error for value for\n\ 1178 linker-allocated global register: linked: 0x%lx%08lx != relaxed: 0x%lx%08lx\n"), 1179 bfd_get_filename (isec->owner), 1180 (unsigned long) (value >> 32), (unsigned long) value, 1181 (unsigned long) (gregdata->reloc_request[bpo_index].value 1182 >> 32), 1183 (unsigned long) gregdata->reloc_request[bpo_index].value); 1184 bfd_set_error (bfd_error_bad_value); 1185 return bfd_reloc_overflow; 1186 } 1187 1188 /* Then store the register number and offset for that register 1189 into datap and datap + 1 respectively. */ 1190 bfd_put_8 (abfd, 1191 gregdata->reloc_request[bpo_index].regindex 1192 + bpo_greg_section->output_section->vma / 8, 1193 datap); 1194 bfd_put_8 (abfd, 1195 gregdata->reloc_request[bpo_index].offset, 1196 ((unsigned char *) datap) + 1); 1197 return bfd_reloc_ok; 1198 } 1199 1200 case R_MMIX_REG_OR_BYTE: 1201 case R_MMIX_REG: 1202 if (value > 255) 1203 return bfd_reloc_overflow; 1204 bfd_put_8 (abfd, value, datap); 1205 return bfd_reloc_ok; 1206 1207 default: 1208 BAD_CASE (howto->type); 1209 } 1210 1211 /* This code adds the common SETL/INCML/INCMH/INCH worst-case 1212 sequence. */ 1213 1214 /* Lowest two bits must be 0. We return bfd_reloc_overflow for 1215 everything that looks strange. */ 1216 if (value & 3) 1217 flag = bfd_reloc_overflow; 1218 1219 bfd_put_32 (abfd, 1220 (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16), 1221 (bfd_byte *) datap + offs); 1222 bfd_put_32 (abfd, 1223 (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16), 1224 (bfd_byte *) datap + offs + 4); 1225 bfd_put_32 (abfd, 1226 (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16), 1227 (bfd_byte *) datap + offs + 8); 1228 bfd_put_32 (abfd, 1229 (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16), 1230 (bfd_byte *) datap + offs + 12); 1231 1232 return flag; 1233} 1234 1235/* Set the howto pointer for an MMIX ELF reloc (type RELA). */ 1236 1237static void 1238mmix_info_to_howto_rela (abfd, cache_ptr, dst) 1239 bfd *abfd ATTRIBUTE_UNUSED; 1240 arelent *cache_ptr; 1241 Elf_Internal_Rela *dst; 1242{ 1243 unsigned int r_type; 1244 1245 r_type = ELF64_R_TYPE (dst->r_info); 1246 BFD_ASSERT (r_type < (unsigned int) R_MMIX_max); 1247 cache_ptr->howto = &elf_mmix_howto_table[r_type]; 1248} 1249 1250/* Any MMIX-specific relocation gets here at assembly time or when linking 1251 to other formats (such as mmo); this is the relocation function from 1252 the reloc_table. We don't get here for final pure ELF linking. */ 1253 1254static bfd_reloc_status_type 1255mmix_elf_reloc (abfd, reloc_entry, symbol, data, input_section, 1256 output_bfd, error_message) 1257 bfd *abfd; 1258 arelent *reloc_entry; 1259 asymbol *symbol; 1260 PTR data; 1261 asection *input_section; 1262 bfd *output_bfd; 1263 char **error_message ATTRIBUTE_UNUSED; 1264{ 1265 bfd_vma relocation; 1266 bfd_reloc_status_type r; 1267 asection *reloc_target_output_section; 1268 bfd_reloc_status_type flag = bfd_reloc_ok; 1269 bfd_vma output_base = 0; 1270 bfd_vma addr; 1271 1272 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 1273 input_section, output_bfd, error_message); 1274 1275 /* If that was all that was needed (i.e. this isn't a final link, only 1276 some segment adjustments), we're done. */ 1277 if (r != bfd_reloc_continue) 1278 return r; 1279 1280 if (bfd_is_und_section (symbol->section) 1281 && (symbol->flags & BSF_WEAK) == 0 1282 && output_bfd == (bfd *) NULL) 1283 return bfd_reloc_undefined; 1284 1285 /* Is the address of the relocation really within the section? */ 1286 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 1287 return bfd_reloc_outofrange; 1288 1289 /* Work out which section the relocation is targeted at and the 1290 initial relocation command value. */ 1291 1292 /* Get symbol value. (Common symbols are special.) */ 1293 if (bfd_is_com_section (symbol->section)) 1294 relocation = 0; 1295 else 1296 relocation = symbol->value; 1297 1298 reloc_target_output_section = bfd_get_output_section (symbol); 1299 1300 /* Here the variable relocation holds the final address of the symbol we 1301 are relocating against, plus any addend. */ 1302 if (output_bfd) 1303 output_base = 0; 1304 else 1305 output_base = reloc_target_output_section->vma; 1306 1307 relocation += output_base + symbol->section->output_offset; 1308 1309 /* Get position of relocation. */ 1310 addr = (reloc_entry->address + input_section->output_section->vma 1311 + input_section->output_offset); 1312 if (output_bfd != (bfd *) NULL) 1313 { 1314 /* Add in supplied addend. */ 1315 relocation += reloc_entry->addend; 1316 1317 /* This is a partial relocation, and we want to apply the 1318 relocation to the reloc entry rather than the raw data. 1319 Modify the reloc inplace to reflect what we now know. */ 1320 reloc_entry->addend = relocation; 1321 reloc_entry->address += input_section->output_offset; 1322 return flag; 1323 } 1324 1325 return mmix_final_link_relocate (reloc_entry->howto, input_section, 1326 data, reloc_entry->address, 1327 reloc_entry->addend, relocation, 1328 bfd_asymbol_name (symbol), 1329 reloc_target_output_section); 1330} 1331 1332/* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it 1333 for guidance if you're thinking of copying this. */ 1334 1335static bfd_boolean 1336mmix_elf_relocate_section (output_bfd, info, input_bfd, input_section, 1337 contents, relocs, local_syms, local_sections) 1338 bfd *output_bfd ATTRIBUTE_UNUSED; 1339 struct bfd_link_info *info; 1340 bfd *input_bfd; 1341 asection *input_section; 1342 bfd_byte *contents; 1343 Elf_Internal_Rela *relocs; 1344 Elf_Internal_Sym *local_syms; 1345 asection **local_sections; 1346{ 1347 Elf_Internal_Shdr *symtab_hdr; 1348 struct elf_link_hash_entry **sym_hashes; 1349 Elf_Internal_Rela *rel; 1350 Elf_Internal_Rela *relend; 1351 bfd_size_type size; 1352 size_t pjsno = 0; 1353 1354 size = input_section->rawsize ? input_section->rawsize : input_section->size; 1355 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1356 sym_hashes = elf_sym_hashes (input_bfd); 1357 relend = relocs + input_section->reloc_count; 1358 1359 /* Zero the stub area before we start. */ 1360 if (input_section->rawsize != 0 1361 && input_section->size > input_section->rawsize) 1362 memset (contents + input_section->rawsize, 0, 1363 input_section->size - input_section->rawsize); 1364 1365 for (rel = relocs; rel < relend; rel ++) 1366 { 1367 reloc_howto_type *howto; 1368 unsigned long r_symndx; 1369 Elf_Internal_Sym *sym; 1370 asection *sec; 1371 struct elf_link_hash_entry *h; 1372 bfd_vma relocation; 1373 bfd_reloc_status_type r; 1374 const char *name = NULL; 1375 int r_type; 1376 bfd_boolean undefined_signalled = FALSE; 1377 1378 r_type = ELF64_R_TYPE (rel->r_info); 1379 1380 if (r_type == R_MMIX_GNU_VTINHERIT 1381 || r_type == R_MMIX_GNU_VTENTRY) 1382 continue; 1383 1384 r_symndx = ELF64_R_SYM (rel->r_info); 1385 1386 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info); 1387 h = NULL; 1388 sym = NULL; 1389 sec = NULL; 1390 1391 if (r_symndx < symtab_hdr->sh_info) 1392 { 1393 sym = local_syms + r_symndx; 1394 sec = local_sections [r_symndx]; 1395 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1396 1397 name = bfd_elf_string_from_elf_section (input_bfd, 1398 symtab_hdr->sh_link, 1399 sym->st_name); 1400 if (name == NULL) 1401 name = bfd_section_name (input_bfd, sec); 1402 } 1403 else 1404 { 1405 bfd_boolean unresolved_reloc; 1406 1407 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1408 r_symndx, symtab_hdr, sym_hashes, 1409 h, sec, relocation, 1410 unresolved_reloc, undefined_signalled); 1411 name = h->root.root.string; 1412 } 1413 1414 if (sec != NULL && elf_discarded_section (sec)) 1415 { 1416 /* For relocs against symbols from removed linkonce sections, 1417 or sections discarded by a linker script, we just want the 1418 section contents zeroed. Avoid any special processing. */ 1419 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); 1420 rel->r_info = 0; 1421 rel->r_addend = 0; 1422 continue; 1423 } 1424 1425 if (info->relocatable) 1426 { 1427 /* This is a relocatable link. For most relocs we don't have to 1428 change anything, unless the reloc is against a section 1429 symbol, in which case we have to adjust according to where 1430 the section symbol winds up in the output section. */ 1431 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 1432 rel->r_addend += sec->output_offset; 1433 1434 /* For PUSHJ stub relocs however, we may need to change the 1435 reloc and the section contents, if the reloc doesn't reach 1436 beyond the end of the output section and previous stubs. 1437 Then we change the section contents to be a PUSHJ to the end 1438 of the input section plus stubs (we can do that without using 1439 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ 1440 at the stub location. */ 1441 if (r_type == R_MMIX_PUSHJ_STUBBABLE) 1442 { 1443 /* We've already checked whether we need a stub; use that 1444 knowledge. */ 1445 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno] 1446 != 0) 1447 { 1448 Elf_Internal_Rela relcpy; 1449 1450 if (mmix_elf_section_data (input_section) 1451 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE) 1452 abort (); 1453 1454 /* There's already a PUSHJ insn there, so just fill in 1455 the offset bits to the stub. */ 1456 if (mmix_final_link_relocate (elf_mmix_howto_table 1457 + R_MMIX_ADDR19, 1458 input_section, 1459 contents, 1460 rel->r_offset, 1461 0, 1462 input_section 1463 ->output_section->vma 1464 + input_section->output_offset 1465 + size 1466 + mmix_elf_section_data (input_section) 1467 ->pjs.stub_offset, 1468 NULL, NULL) != bfd_reloc_ok) 1469 return FALSE; 1470 1471 /* Put a JMP insn at the stub; it goes with the 1472 R_MMIX_JMP reloc. */ 1473 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24, 1474 contents 1475 + size 1476 + mmix_elf_section_data (input_section) 1477 ->pjs.stub_offset); 1478 1479 /* Change the reloc to be at the stub, and to a full 1480 R_MMIX_JMP reloc. */ 1481 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP); 1482 rel->r_offset 1483 = (size 1484 + mmix_elf_section_data (input_section) 1485 ->pjs.stub_offset); 1486 1487 mmix_elf_section_data (input_section)->pjs.stub_offset 1488 += MAX_PUSHJ_STUB_SIZE; 1489 1490 /* Shift this reloc to the end of the relocs to maintain 1491 the r_offset sorted reloc order. */ 1492 relcpy = *rel; 1493 memmove (rel, rel + 1, (char *) relend - (char *) rel); 1494 relend[-1] = relcpy; 1495 1496 /* Back up one reloc, or else we'd skip the next reloc 1497 in turn. */ 1498 rel--; 1499 } 1500 1501 pjsno++; 1502 } 1503 continue; 1504 } 1505 1506 r = mmix_final_link_relocate (howto, input_section, 1507 contents, rel->r_offset, 1508 rel->r_addend, relocation, name, sec); 1509 1510 if (r != bfd_reloc_ok) 1511 { 1512 bfd_boolean check_ok = TRUE; 1513 const char * msg = (const char *) NULL; 1514 1515 switch (r) 1516 { 1517 case bfd_reloc_overflow: 1518 check_ok = info->callbacks->reloc_overflow 1519 (info, (h ? &h->root : NULL), name, howto->name, 1520 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1521 break; 1522 1523 case bfd_reloc_undefined: 1524 /* We may have sent this message above. */ 1525 if (! undefined_signalled) 1526 check_ok = info->callbacks->undefined_symbol 1527 (info, name, input_bfd, input_section, rel->r_offset, 1528 TRUE); 1529 undefined_signalled = TRUE; 1530 break; 1531 1532 case bfd_reloc_outofrange: 1533 msg = _("internal error: out of range error"); 1534 break; 1535 1536 case bfd_reloc_notsupported: 1537 msg = _("internal error: unsupported relocation error"); 1538 break; 1539 1540 case bfd_reloc_dangerous: 1541 msg = _("internal error: dangerous relocation"); 1542 break; 1543 1544 default: 1545 msg = _("internal error: unknown error"); 1546 break; 1547 } 1548 1549 if (msg) 1550 check_ok = info->callbacks->warning 1551 (info, msg, name, input_bfd, input_section, rel->r_offset); 1552 1553 if (! check_ok) 1554 return FALSE; 1555 } 1556 } 1557 1558 return TRUE; 1559} 1560 1561/* Perform a single relocation. By default we use the standard BFD 1562 routines. A few relocs we have to do ourselves. */ 1563 1564static bfd_reloc_status_type 1565mmix_final_link_relocate (howto, input_section, contents, 1566 r_offset, r_addend, relocation, symname, symsec) 1567 reloc_howto_type *howto; 1568 asection *input_section; 1569 bfd_byte *contents; 1570 bfd_vma r_offset; 1571 bfd_signed_vma r_addend; 1572 bfd_vma relocation; 1573 const char *symname; 1574 asection *symsec; 1575{ 1576 bfd_reloc_status_type r = bfd_reloc_ok; 1577 bfd_vma addr 1578 = (input_section->output_section->vma 1579 + input_section->output_offset 1580 + r_offset); 1581 bfd_signed_vma srel 1582 = (bfd_signed_vma) relocation + r_addend; 1583 1584 switch (howto->type) 1585 { 1586 /* All these are PC-relative. */ 1587 case R_MMIX_PUSHJ_STUBBABLE: 1588 case R_MMIX_PUSHJ: 1589 case R_MMIX_CBRANCH: 1590 case R_MMIX_ADDR19: 1591 case R_MMIX_GETA: 1592 case R_MMIX_ADDR27: 1593 case R_MMIX_JMP: 1594 contents += r_offset; 1595 1596 srel -= (input_section->output_section->vma 1597 + input_section->output_offset 1598 + r_offset); 1599 1600 r = mmix_elf_perform_relocation (input_section, howto, contents, 1601 addr, srel); 1602 break; 1603 1604 case R_MMIX_BASE_PLUS_OFFSET: 1605 if (symsec == NULL) 1606 return bfd_reloc_undefined; 1607 1608 /* Check that we're not relocating against a register symbol. */ 1609 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1610 MMIX_REG_CONTENTS_SECTION_NAME) == 0 1611 || strcmp (bfd_get_section_name (symsec->owner, symsec), 1612 MMIX_REG_SECTION_NAME) == 0) 1613 { 1614 /* Note: This is separated out into two messages in order 1615 to ease the translation into other languages. */ 1616 if (symname == NULL || *symname == 0) 1617 (*_bfd_error_handler) 1618 (_("%s: base-plus-offset relocation against register symbol: (unknown) in %s"), 1619 bfd_get_filename (input_section->owner), 1620 bfd_get_section_name (symsec->owner, symsec)); 1621 else 1622 (*_bfd_error_handler) 1623 (_("%s: base-plus-offset relocation against register symbol: %s in %s"), 1624 bfd_get_filename (input_section->owner), symname, 1625 bfd_get_section_name (symsec->owner, symsec)); 1626 return bfd_reloc_overflow; 1627 } 1628 goto do_mmix_reloc; 1629 1630 case R_MMIX_REG_OR_BYTE: 1631 case R_MMIX_REG: 1632 /* For now, we handle these alike. They must refer to an register 1633 symbol, which is either relative to the register section and in 1634 the range 0..255, or is in the register contents section with vma 1635 regno * 8. */ 1636 1637 /* FIXME: A better way to check for reg contents section? 1638 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */ 1639 if (symsec == NULL) 1640 return bfd_reloc_undefined; 1641 1642 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1643 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1644 { 1645 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1646 { 1647 /* The bfd_reloc_outofrange return value, though intuitively 1648 a better value, will not get us an error. */ 1649 return bfd_reloc_overflow; 1650 } 1651 srel /= 8; 1652 } 1653 else if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1654 MMIX_REG_SECTION_NAME) == 0) 1655 { 1656 if (srel < 0 || srel > 255) 1657 /* The bfd_reloc_outofrange return value, though intuitively a 1658 better value, will not get us an error. */ 1659 return bfd_reloc_overflow; 1660 } 1661 else 1662 { 1663 /* Note: This is separated out into two messages in order 1664 to ease the translation into other languages. */ 1665 if (symname == NULL || *symname == 0) 1666 (*_bfd_error_handler) 1667 (_("%s: register relocation against non-register symbol: (unknown) in %s"), 1668 bfd_get_filename (input_section->owner), 1669 bfd_get_section_name (symsec->owner, symsec)); 1670 else 1671 (*_bfd_error_handler) 1672 (_("%s: register relocation against non-register symbol: %s in %s"), 1673 bfd_get_filename (input_section->owner), symname, 1674 bfd_get_section_name (symsec->owner, symsec)); 1675 1676 /* The bfd_reloc_outofrange return value, though intuitively a 1677 better value, will not get us an error. */ 1678 return bfd_reloc_overflow; 1679 } 1680 do_mmix_reloc: 1681 contents += r_offset; 1682 r = mmix_elf_perform_relocation (input_section, howto, contents, 1683 addr, srel); 1684 break; 1685 1686 case R_MMIX_LOCAL: 1687 /* This isn't a real relocation, it's just an assertion that the 1688 final relocation value corresponds to a local register. We 1689 ignore the actual relocation; nothing is changed. */ 1690 { 1691 asection *regsec 1692 = bfd_get_section_by_name (input_section->output_section->owner, 1693 MMIX_REG_CONTENTS_SECTION_NAME); 1694 bfd_vma first_global; 1695 1696 /* Check that this is an absolute value, or a reference to the 1697 register contents section or the register (symbol) section. 1698 Absolute numbers can get here as undefined section. Undefined 1699 symbols are signalled elsewhere, so there's no conflict in us 1700 accidentally handling it. */ 1701 if (!bfd_is_abs_section (symsec) 1702 && !bfd_is_und_section (symsec) 1703 && strcmp (bfd_get_section_name (symsec->owner, symsec), 1704 MMIX_REG_CONTENTS_SECTION_NAME) != 0 1705 && strcmp (bfd_get_section_name (symsec->owner, symsec), 1706 MMIX_REG_SECTION_NAME) != 0) 1707 { 1708 (*_bfd_error_handler) 1709 (_("%s: directive LOCAL valid only with a register or absolute value"), 1710 bfd_get_filename (input_section->owner)); 1711 1712 return bfd_reloc_overflow; 1713 } 1714 1715 /* If we don't have a register contents section, then $255 is the 1716 first global register. */ 1717 if (regsec == NULL) 1718 first_global = 255; 1719 else 1720 { 1721 first_global = bfd_get_section_vma (abfd, regsec) / 8; 1722 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1723 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1724 { 1725 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1726 /* The bfd_reloc_outofrange return value, though 1727 intuitively a better value, will not get us an error. */ 1728 return bfd_reloc_overflow; 1729 srel /= 8; 1730 } 1731 } 1732 1733 if ((bfd_vma) srel >= first_global) 1734 { 1735 /* FIXME: Better error message. */ 1736 (*_bfd_error_handler) 1737 (_("%s: LOCAL directive: Register $%ld is not a local register. First global register is $%ld."), 1738 bfd_get_filename (input_section->owner), (long) srel, (long) first_global); 1739 1740 return bfd_reloc_overflow; 1741 } 1742 } 1743 r = bfd_reloc_ok; 1744 break; 1745 1746 default: 1747 r = _bfd_final_link_relocate (howto, input_section->owner, input_section, 1748 contents, r_offset, 1749 relocation, r_addend); 1750 } 1751 1752 return r; 1753} 1754 1755/* Return the section that should be marked against GC for a given 1756 relocation. */ 1757 1758static asection * 1759mmix_elf_gc_mark_hook (asection *sec, 1760 struct bfd_link_info *info, 1761 Elf_Internal_Rela *rel, 1762 struct elf_link_hash_entry *h, 1763 Elf_Internal_Sym *sym) 1764{ 1765 if (h != NULL) 1766 switch (ELF64_R_TYPE (rel->r_info)) 1767 { 1768 case R_MMIX_GNU_VTINHERIT: 1769 case R_MMIX_GNU_VTENTRY: 1770 return NULL; 1771 } 1772 1773 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1774} 1775 1776/* Update relocation info for a GC-excluded section. We could supposedly 1777 perform the allocation after GC, but there's no suitable hook between 1778 GC (or section merge) and the point when all input sections must be 1779 present. Better to waste some memory and (perhaps) a little time. */ 1780 1781static bfd_boolean 1782mmix_elf_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, 1783 struct bfd_link_info *info ATTRIBUTE_UNUSED, 1784 asection *sec, 1785 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) 1786{ 1787 struct bpo_reloc_section_info *bpodata 1788 = mmix_elf_section_data (sec)->bpo.reloc; 1789 asection *allocated_gregs_section; 1790 1791 /* If no bpodata here, we have nothing to do. */ 1792 if (bpodata == NULL) 1793 return TRUE; 1794 1795 allocated_gregs_section = bpodata->bpo_greg_section; 1796 1797 mmix_elf_section_data (allocated_gregs_section)->bpo.greg->n_bpo_relocs 1798 -= bpodata->n_bpo_relocs_this_section; 1799 1800 return TRUE; 1801} 1802 1803/* Sort register relocs to come before expanding relocs. */ 1804 1805static int 1806mmix_elf_sort_relocs (p1, p2) 1807 const PTR p1; 1808 const PTR p2; 1809{ 1810 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1; 1811 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2; 1812 int r1_is_reg, r2_is_reg; 1813 1814 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive 1815 insns. */ 1816 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3)) 1817 return 1; 1818 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3)) 1819 return -1; 1820 1821 r1_is_reg 1822 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE 1823 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG); 1824 r2_is_reg 1825 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE 1826 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG); 1827 if (r1_is_reg != r2_is_reg) 1828 return r2_is_reg - r1_is_reg; 1829 1830 /* Neither or both are register relocs. Then sort on full offset. */ 1831 if (r1->r_offset > r2->r_offset) 1832 return 1; 1833 else if (r1->r_offset < r2->r_offset) 1834 return -1; 1835 return 0; 1836} 1837 1838/* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */ 1839 1840static bfd_boolean 1841mmix_elf_check_common_relocs (abfd, info, sec, relocs) 1842 bfd *abfd; 1843 struct bfd_link_info *info; 1844 asection *sec; 1845 const Elf_Internal_Rela *relocs; 1846{ 1847 bfd *bpo_greg_owner = NULL; 1848 asection *allocated_gregs_section = NULL; 1849 struct bpo_greg_section_info *gregdata = NULL; 1850 struct bpo_reloc_section_info *bpodata = NULL; 1851 const Elf_Internal_Rela *rel; 1852 const Elf_Internal_Rela *rel_end; 1853 1854 /* We currently have to abuse this COFF-specific member, since there's 1855 no target-machine-dedicated member. There's no alternative outside 1856 the bfd_link_info struct; we can't specialize a hash-table since 1857 they're different between ELF and mmo. */ 1858 bpo_greg_owner = (bfd *) info->base_file; 1859 1860 rel_end = relocs + sec->reloc_count; 1861 for (rel = relocs; rel < rel_end; rel++) 1862 { 1863 switch (ELF64_R_TYPE (rel->r_info)) 1864 { 1865 /* This relocation causes a GREG allocation. We need to count 1866 them, and we need to create a section for them, so we need an 1867 object to fake as the owner of that section. We can't use 1868 the ELF dynobj for this, since the ELF bits assume lots of 1869 DSO-related stuff if that member is non-NULL. */ 1870 case R_MMIX_BASE_PLUS_OFFSET: 1871 /* We don't do anything with this reloc for a relocatable link. */ 1872 if (info->relocatable) 1873 break; 1874 1875 if (bpo_greg_owner == NULL) 1876 { 1877 bpo_greg_owner = abfd; 1878 info->base_file = (PTR) bpo_greg_owner; 1879 } 1880 1881 if (allocated_gregs_section == NULL) 1882 allocated_gregs_section 1883 = bfd_get_section_by_name (bpo_greg_owner, 1884 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 1885 1886 if (allocated_gregs_section == NULL) 1887 { 1888 allocated_gregs_section 1889 = bfd_make_section_with_flags (bpo_greg_owner, 1890 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME, 1891 (SEC_HAS_CONTENTS 1892 | SEC_IN_MEMORY 1893 | SEC_LINKER_CREATED)); 1894 /* Setting both SEC_ALLOC and SEC_LOAD means the section is 1895 treated like any other section, and we'd get errors for 1896 address overlap with the text section. Let's set none of 1897 those flags, as that is what currently happens for usual 1898 GREG allocations, and that works. */ 1899 if (allocated_gregs_section == NULL 1900 || !bfd_set_section_alignment (bpo_greg_owner, 1901 allocated_gregs_section, 1902 3)) 1903 return FALSE; 1904 1905 gregdata = (struct bpo_greg_section_info *) 1906 bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info)); 1907 if (gregdata == NULL) 1908 return FALSE; 1909 mmix_elf_section_data (allocated_gregs_section)->bpo.greg 1910 = gregdata; 1911 } 1912 else if (gregdata == NULL) 1913 gregdata 1914 = mmix_elf_section_data (allocated_gregs_section)->bpo.greg; 1915 1916 /* Get ourselves some auxiliary info for the BPO-relocs. */ 1917 if (bpodata == NULL) 1918 { 1919 /* No use doing a separate iteration pass to find the upper 1920 limit - just use the number of relocs. */ 1921 bpodata = (struct bpo_reloc_section_info *) 1922 bfd_alloc (bpo_greg_owner, 1923 sizeof (struct bpo_reloc_section_info) 1924 * (sec->reloc_count + 1)); 1925 if (bpodata == NULL) 1926 return FALSE; 1927 mmix_elf_section_data (sec)->bpo.reloc = bpodata; 1928 bpodata->first_base_plus_offset_reloc 1929 = bpodata->bpo_index 1930 = gregdata->n_max_bpo_relocs; 1931 bpodata->bpo_greg_section 1932 = allocated_gregs_section; 1933 bpodata->n_bpo_relocs_this_section = 0; 1934 } 1935 1936 bpodata->n_bpo_relocs_this_section++; 1937 gregdata->n_max_bpo_relocs++; 1938 1939 /* We don't get another chance to set this before GC; we've not 1940 set up any hook that runs before GC. */ 1941 gregdata->n_bpo_relocs 1942 = gregdata->n_max_bpo_relocs; 1943 break; 1944 1945 case R_MMIX_PUSHJ_STUBBABLE: 1946 mmix_elf_section_data (sec)->pjs.n_pushj_relocs++; 1947 break; 1948 } 1949 } 1950 1951 /* Allocate per-reloc stub storage and initialize it to the max stub 1952 size. */ 1953 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0) 1954 { 1955 size_t i; 1956 1957 mmix_elf_section_data (sec)->pjs.stub_size 1958 = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs 1959 * sizeof (mmix_elf_section_data (sec) 1960 ->pjs.stub_size[0])); 1961 if (mmix_elf_section_data (sec)->pjs.stub_size == NULL) 1962 return FALSE; 1963 1964 for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++) 1965 mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE; 1966 } 1967 1968 return TRUE; 1969} 1970 1971/* Look through the relocs for a section during the first phase. */ 1972 1973static bfd_boolean 1974mmix_elf_check_relocs (abfd, info, sec, relocs) 1975 bfd *abfd; 1976 struct bfd_link_info *info; 1977 asection *sec; 1978 const Elf_Internal_Rela *relocs; 1979{ 1980 Elf_Internal_Shdr *symtab_hdr; 1981 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 1982 const Elf_Internal_Rela *rel; 1983 const Elf_Internal_Rela *rel_end; 1984 1985 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1986 sym_hashes = elf_sym_hashes (abfd); 1987 sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf64_External_Sym); 1988 if (!elf_bad_symtab (abfd)) 1989 sym_hashes_end -= symtab_hdr->sh_info; 1990 1991 /* First we sort the relocs so that any register relocs come before 1992 expansion-relocs to the same insn. FIXME: Not done for mmo. */ 1993 qsort ((PTR) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), 1994 mmix_elf_sort_relocs); 1995 1996 /* Do the common part. */ 1997 if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs)) 1998 return FALSE; 1999 2000 if (info->relocatable) 2001 return TRUE; 2002 2003 rel_end = relocs + sec->reloc_count; 2004 for (rel = relocs; rel < rel_end; rel++) 2005 { 2006 struct elf_link_hash_entry *h; 2007 unsigned long r_symndx; 2008 2009 r_symndx = ELF64_R_SYM (rel->r_info); 2010 if (r_symndx < symtab_hdr->sh_info) 2011 h = NULL; 2012 else 2013 { 2014 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2015 while (h->root.type == bfd_link_hash_indirect 2016 || h->root.type == bfd_link_hash_warning) 2017 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2018 } 2019 2020 switch (ELF64_R_TYPE (rel->r_info)) 2021 { 2022 /* This relocation describes the C++ object vtable hierarchy. 2023 Reconstruct it for later use during GC. */ 2024 case R_MMIX_GNU_VTINHERIT: 2025 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2026 return FALSE; 2027 break; 2028 2029 /* This relocation describes which C++ vtable entries are actually 2030 used. Record for later use during GC. */ 2031 case R_MMIX_GNU_VTENTRY: 2032 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2033 return FALSE; 2034 break; 2035 } 2036 } 2037 2038 return TRUE; 2039} 2040 2041/* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo. 2042 Copied from elf_link_add_object_symbols. */ 2043 2044bfd_boolean 2045_bfd_mmix_check_all_relocs (abfd, info) 2046 bfd *abfd; 2047 struct bfd_link_info *info; 2048{ 2049 asection *o; 2050 2051 for (o = abfd->sections; o != NULL; o = o->next) 2052 { 2053 Elf_Internal_Rela *internal_relocs; 2054 bfd_boolean ok; 2055 2056 if ((o->flags & SEC_RELOC) == 0 2057 || o->reloc_count == 0 2058 || ((info->strip == strip_all || info->strip == strip_debugger) 2059 && (o->flags & SEC_DEBUGGING) != 0) 2060 || bfd_is_abs_section (o->output_section)) 2061 continue; 2062 2063 internal_relocs 2064 = _bfd_elf_link_read_relocs (abfd, o, (PTR) NULL, 2065 (Elf_Internal_Rela *) NULL, 2066 info->keep_memory); 2067 if (internal_relocs == NULL) 2068 return FALSE; 2069 2070 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs); 2071 2072 if (! info->keep_memory) 2073 free (internal_relocs); 2074 2075 if (! ok) 2076 return FALSE; 2077 } 2078 2079 return TRUE; 2080} 2081 2082/* Change symbols relative to the reg contents section to instead be to 2083 the register section, and scale them down to correspond to the register 2084 number. */ 2085 2086static bfd_boolean 2087mmix_elf_link_output_symbol_hook (info, name, sym, input_sec, h) 2088 struct bfd_link_info *info ATTRIBUTE_UNUSED; 2089 const char *name ATTRIBUTE_UNUSED; 2090 Elf_Internal_Sym *sym; 2091 asection *input_sec; 2092 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED; 2093{ 2094 if (input_sec != NULL 2095 && input_sec->name != NULL 2096 && ELF_ST_TYPE (sym->st_info) != STT_SECTION 2097 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0) 2098 { 2099 sym->st_value /= 8; 2100 sym->st_shndx = SHN_REGISTER; 2101 } 2102 2103 return TRUE; 2104} 2105 2106/* We fake a register section that holds values that are register numbers. 2107 Having a SHN_REGISTER and register section translates better to other 2108 formats (e.g. mmo) than for example a STT_REGISTER attribute. 2109 This section faking is based on a construct in elf32-mips.c. */ 2110static asection mmix_elf_reg_section; 2111static asymbol mmix_elf_reg_section_symbol; 2112static asymbol *mmix_elf_reg_section_symbol_ptr; 2113 2114/* Handle the special section numbers that a symbol may use. */ 2115 2116void 2117mmix_elf_symbol_processing (abfd, asym) 2118 bfd *abfd ATTRIBUTE_UNUSED; 2119 asymbol *asym; 2120{ 2121 elf_symbol_type *elfsym; 2122 2123 elfsym = (elf_symbol_type *) asym; 2124 switch (elfsym->internal_elf_sym.st_shndx) 2125 { 2126 case SHN_REGISTER: 2127 if (mmix_elf_reg_section.name == NULL) 2128 { 2129 /* Initialize the register section. */ 2130 mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME; 2131 mmix_elf_reg_section.flags = SEC_NO_FLAGS; 2132 mmix_elf_reg_section.output_section = &mmix_elf_reg_section; 2133 mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol; 2134 mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr; 2135 mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME; 2136 mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM; 2137 mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section; 2138 mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol; 2139 } 2140 asym->section = &mmix_elf_reg_section; 2141 break; 2142 2143 default: 2144 break; 2145 } 2146} 2147 2148/* Given a BFD section, try to locate the corresponding ELF section 2149 index. */ 2150 2151static bfd_boolean 2152mmix_elf_section_from_bfd_section (abfd, sec, retval) 2153 bfd * abfd ATTRIBUTE_UNUSED; 2154 asection * sec; 2155 int * retval; 2156{ 2157 if (strcmp (bfd_get_section_name (abfd, sec), MMIX_REG_SECTION_NAME) == 0) 2158 *retval = SHN_REGISTER; 2159 else 2160 return FALSE; 2161 2162 return TRUE; 2163} 2164 2165/* Hook called by the linker routine which adds symbols from an object 2166 file. We must handle the special SHN_REGISTER section number here. 2167 2168 We also check that we only have *one* each of the section-start 2169 symbols, since otherwise having two with the same value would cause 2170 them to be "merged", but with the contents serialized. */ 2171 2172bfd_boolean 2173mmix_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp) 2174 bfd *abfd; 2175 struct bfd_link_info *info ATTRIBUTE_UNUSED; 2176 Elf_Internal_Sym *sym; 2177 const char **namep ATTRIBUTE_UNUSED; 2178 flagword *flagsp ATTRIBUTE_UNUSED; 2179 asection **secp; 2180 bfd_vma *valp ATTRIBUTE_UNUSED; 2181{ 2182 if (sym->st_shndx == SHN_REGISTER) 2183 { 2184 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME); 2185 (*secp)->flags |= SEC_LINKER_CREATED; 2186 } 2187 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.' 2188 && CONST_STRNEQ (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) 2189 { 2190 /* See if we have another one. */ 2191 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash, 2192 *namep, 2193 FALSE, 2194 FALSE, 2195 FALSE); 2196 2197 if (h != NULL && h->type != bfd_link_hash_undefined) 2198 { 2199 /* How do we get the asymbol (or really: the filename) from h? 2200 h->u.def.section->owner is NULL. */ 2201 ((*_bfd_error_handler) 2202 (_("%s: Error: multiple definition of `%s'; start of %s is set in a earlier linked file\n"), 2203 bfd_get_filename (abfd), *namep, 2204 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX))); 2205 bfd_set_error (bfd_error_bad_value); 2206 return FALSE; 2207 } 2208 } 2209 2210 return TRUE; 2211} 2212 2213/* We consider symbols matching "L.*:[0-9]+" to be local symbols. */ 2214 2215bfd_boolean 2216mmix_elf_is_local_label_name (abfd, name) 2217 bfd *abfd; 2218 const char *name; 2219{ 2220 const char *colpos; 2221 int digits; 2222 2223 /* Also include the default local-label definition. */ 2224 if (_bfd_elf_is_local_label_name (abfd, name)) 2225 return TRUE; 2226 2227 if (*name != 'L') 2228 return FALSE; 2229 2230 /* If there's no ":", or more than one, it's not a local symbol. */ 2231 colpos = strchr (name, ':'); 2232 if (colpos == NULL || strchr (colpos + 1, ':') != NULL) 2233 return FALSE; 2234 2235 /* Check that there are remaining characters and that they are digits. */ 2236 if (colpos[1] == 0) 2237 return FALSE; 2238 2239 digits = strspn (colpos + 1, "0123456789"); 2240 return digits != 0 && colpos[1 + digits] == 0; 2241} 2242 2243/* We get rid of the register section here. */ 2244 2245bfd_boolean 2246mmix_elf_final_link (abfd, info) 2247 bfd *abfd; 2248 struct bfd_link_info *info; 2249{ 2250 /* We never output a register section, though we create one for 2251 temporary measures. Check that nobody entered contents into it. */ 2252 asection *reg_section; 2253 2254 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME); 2255 2256 if (reg_section != NULL) 2257 { 2258 /* FIXME: Pass error state gracefully. */ 2259 if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS) 2260 _bfd_abort (__FILE__, __LINE__, _("Register section has contents\n")); 2261 2262 /* Really remove the section, if it hasn't already been done. */ 2263 if (!bfd_section_removed_from_list (abfd, reg_section)) 2264 { 2265 bfd_section_list_remove (abfd, reg_section); 2266 --abfd->section_count; 2267 } 2268 } 2269 2270 if (! bfd_elf_final_link (abfd, info)) 2271 return FALSE; 2272 2273 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by 2274 the regular linker machinery. We do it here, like other targets with 2275 special sections. */ 2276 if (info->base_file != NULL) 2277 { 2278 asection *greg_section 2279 = bfd_get_section_by_name ((bfd *) info->base_file, 2280 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2281 if (!bfd_set_section_contents (abfd, 2282 greg_section->output_section, 2283 greg_section->contents, 2284 (file_ptr) greg_section->output_offset, 2285 greg_section->size)) 2286 return FALSE; 2287 } 2288 return TRUE; 2289} 2290 2291/* We need to include the maximum size of PUSHJ-stubs in the initial 2292 section size. This is expected to shrink during linker relaxation. */ 2293 2294static void 2295mmix_set_relaxable_size (abfd, sec, ptr) 2296 bfd *abfd ATTRIBUTE_UNUSED; 2297 asection *sec; 2298 void *ptr; 2299{ 2300 struct bfd_link_info *info = ptr; 2301 2302 /* Make sure we only do this for section where we know we want this, 2303 otherwise we might end up resetting the size of COMMONs. */ 2304 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0) 2305 return; 2306 2307 sec->rawsize = sec->size; 2308 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2309 * MAX_PUSHJ_STUB_SIZE); 2310 2311 /* For use in relocatable link, we start with a max stubs size. See 2312 mmix_elf_relax_section. */ 2313 if (info->relocatable && sec->output_section) 2314 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum 2315 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2316 * MAX_PUSHJ_STUB_SIZE); 2317} 2318 2319/* Initialize stuff for the linker-generated GREGs to match 2320 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */ 2321 2322bfd_boolean 2323_bfd_mmix_before_linker_allocation (abfd, info) 2324 bfd *abfd ATTRIBUTE_UNUSED; 2325 struct bfd_link_info *info; 2326{ 2327 asection *bpo_gregs_section; 2328 bfd *bpo_greg_owner; 2329 struct bpo_greg_section_info *gregdata; 2330 size_t n_gregs; 2331 bfd_vma gregs_size; 2332 size_t i; 2333 size_t *bpo_reloc_indexes; 2334 bfd *ibfd; 2335 2336 /* Set the initial size of sections. */ 2337 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 2338 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info); 2339 2340 /* The bpo_greg_owner bfd is supposed to have been set by 2341 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen. 2342 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2343 bpo_greg_owner = (bfd *) info->base_file; 2344 if (bpo_greg_owner == NULL) 2345 return TRUE; 2346 2347 bpo_gregs_section 2348 = bfd_get_section_by_name (bpo_greg_owner, 2349 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2350 2351 if (bpo_gregs_section == NULL) 2352 return TRUE; 2353 2354 /* We use the target-data handle in the ELF section data. */ 2355 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2356 if (gregdata == NULL) 2357 return FALSE; 2358 2359 n_gregs = gregdata->n_bpo_relocs; 2360 gregdata->n_allocated_bpo_gregs = n_gregs; 2361 2362 /* When this reaches zero during relaxation, all entries have been 2363 filled in and the size of the linker gregs can be calculated. */ 2364 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs; 2365 2366 /* Set the zeroth-order estimate for the GREGs size. */ 2367 gregs_size = n_gregs * 8; 2368 2369 if (!bfd_set_section_size (bpo_greg_owner, bpo_gregs_section, gregs_size)) 2370 return FALSE; 2371 2372 /* Allocate and set up the GREG arrays. They're filled in at relaxation 2373 time. Note that we must use the max number ever noted for the array, 2374 since the index numbers were created before GC. */ 2375 gregdata->reloc_request 2376 = bfd_zalloc (bpo_greg_owner, 2377 sizeof (struct bpo_reloc_request) 2378 * gregdata->n_max_bpo_relocs); 2379 2380 gregdata->bpo_reloc_indexes 2381 = bpo_reloc_indexes 2382 = bfd_alloc (bpo_greg_owner, 2383 gregdata->n_max_bpo_relocs 2384 * sizeof (size_t)); 2385 if (bpo_reloc_indexes == NULL) 2386 return FALSE; 2387 2388 /* The default order is an identity mapping. */ 2389 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2390 { 2391 bpo_reloc_indexes[i] = i; 2392 gregdata->reloc_request[i].bpo_reloc_no = i; 2393 } 2394 2395 return TRUE; 2396} 2397 2398/* Fill in contents in the linker allocated gregs. Everything is 2399 calculated at this point; we just move the contents into place here. */ 2400 2401bfd_boolean 2402_bfd_mmix_after_linker_allocation (abfd, link_info) 2403 bfd *abfd ATTRIBUTE_UNUSED; 2404 struct bfd_link_info *link_info; 2405{ 2406 asection *bpo_gregs_section; 2407 bfd *bpo_greg_owner; 2408 struct bpo_greg_section_info *gregdata; 2409 size_t n_gregs; 2410 size_t i, j; 2411 size_t lastreg; 2412 bfd_byte *contents; 2413 2414 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs 2415 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such 2416 object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2417 bpo_greg_owner = (bfd *) link_info->base_file; 2418 if (bpo_greg_owner == NULL) 2419 return TRUE; 2420 2421 bpo_gregs_section 2422 = bfd_get_section_by_name (bpo_greg_owner, 2423 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2424 2425 /* This can't happen without DSO handling. When DSOs are handled 2426 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such 2427 section. */ 2428 if (bpo_gregs_section == NULL) 2429 return TRUE; 2430 2431 /* We use the target-data handle in the ELF section data. */ 2432 2433 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2434 if (gregdata == NULL) 2435 return FALSE; 2436 2437 n_gregs = gregdata->n_allocated_bpo_gregs; 2438 2439 bpo_gregs_section->contents 2440 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size); 2441 if (contents == NULL) 2442 return FALSE; 2443 2444 /* Sanity check: If these numbers mismatch, some relocation has not been 2445 accounted for and the rest of gregdata is probably inconsistent. 2446 It's a bug, but it's more helpful to identify it than segfaulting 2447 below. */ 2448 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round 2449 != gregdata->n_bpo_relocs) 2450 { 2451 (*_bfd_error_handler) 2452 (_("Internal inconsistency: remaining %u != max %u.\n\ 2453 Please report this bug."), 2454 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2455 gregdata->n_bpo_relocs); 2456 return FALSE; 2457 } 2458 2459 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++) 2460 if (gregdata->reloc_request[i].regindex != lastreg) 2461 { 2462 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value, 2463 contents + j * 8); 2464 lastreg = gregdata->reloc_request[i].regindex; 2465 j++; 2466 } 2467 2468 return TRUE; 2469} 2470 2471/* Sort valid relocs to come before non-valid relocs, then on increasing 2472 value. */ 2473 2474static int 2475bpo_reloc_request_sort_fn (p1, p2) 2476 const PTR p1; 2477 const PTR p2; 2478{ 2479 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1; 2480 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2; 2481 2482 /* Primary function is validity; non-valid relocs sorted after valid 2483 ones. */ 2484 if (r1->valid != r2->valid) 2485 return r2->valid - r1->valid; 2486 2487 /* Then sort on value. Don't simplify and return just the difference of 2488 the values: the upper bits of the 64-bit value would be truncated on 2489 a host with 32-bit ints. */ 2490 if (r1->value != r2->value) 2491 return r1->value > r2->value ? 1 : -1; 2492 2493 /* As a last re-sort, use the relocation number, so we get a stable 2494 sort. The *addresses* aren't stable since items are swapped during 2495 sorting. It depends on the qsort implementation if this actually 2496 happens. */ 2497 return r1->bpo_reloc_no > r2->bpo_reloc_no 2498 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0); 2499} 2500 2501/* For debug use only. Dumps the global register allocations resulting 2502 from base-plus-offset relocs. */ 2503 2504void 2505mmix_dump_bpo_gregs (link_info, pf) 2506 struct bfd_link_info *link_info; 2507 bfd_error_handler_type pf; 2508{ 2509 bfd *bpo_greg_owner; 2510 asection *bpo_gregs_section; 2511 struct bpo_greg_section_info *gregdata; 2512 unsigned int i; 2513 2514 if (link_info == NULL || link_info->base_file == NULL) 2515 return; 2516 2517 bpo_greg_owner = (bfd *) link_info->base_file; 2518 2519 bpo_gregs_section 2520 = bfd_get_section_by_name (bpo_greg_owner, 2521 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2522 2523 if (bpo_gregs_section == NULL) 2524 return; 2525 2526 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2527 if (gregdata == NULL) 2528 return; 2529 2530 if (pf == NULL) 2531 pf = _bfd_error_handler; 2532 2533 /* These format strings are not translated. They are for debug purposes 2534 only and never displayed to an end user. Should they escape, we 2535 surely want them in original. */ 2536 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\ 2537 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs, 2538 gregdata->n_max_bpo_relocs, 2539 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2540 gregdata->n_allocated_bpo_gregs); 2541 2542 if (gregdata->reloc_request) 2543 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2544 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n", 2545 i, 2546 (gregdata->bpo_reloc_indexes != NULL 2547 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1), 2548 gregdata->reloc_request[i].bpo_reloc_no, 2549 gregdata->reloc_request[i].valid, 2550 2551 (unsigned long) (gregdata->reloc_request[i].value >> 32), 2552 (unsigned long) gregdata->reloc_request[i].value, 2553 gregdata->reloc_request[i].regindex, 2554 gregdata->reloc_request[i].offset); 2555} 2556 2557/* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and 2558 when the last such reloc is done, an index-array is sorted according to 2559 the values and iterated over to produce register numbers (indexed by 0 2560 from the first allocated register number) and offsets for use in real 2561 relocation. 2562 2563 PUSHJ stub accounting is also done here. 2564 2565 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 2566 2567static bfd_boolean 2568mmix_elf_relax_section (abfd, sec, link_info, again) 2569 bfd *abfd; 2570 asection *sec; 2571 struct bfd_link_info *link_info; 2572 bfd_boolean *again; 2573{ 2574 Elf_Internal_Shdr *symtab_hdr; 2575 Elf_Internal_Rela *internal_relocs; 2576 Elf_Internal_Rela *irel, *irelend; 2577 asection *bpo_gregs_section = NULL; 2578 struct bpo_greg_section_info *gregdata; 2579 struct bpo_reloc_section_info *bpodata 2580 = mmix_elf_section_data (sec)->bpo.reloc; 2581 /* The initialization is to quiet compiler warnings. The value is to 2582 spot a missing actual initialization. */ 2583 size_t bpono = (size_t) -1; 2584 size_t pjsno = 0; 2585 bfd *bpo_greg_owner; 2586 Elf_Internal_Sym *isymbuf = NULL; 2587 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size; 2588 2589 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0; 2590 2591 /* Assume nothing changes. */ 2592 *again = FALSE; 2593 2594 /* We don't have to do anything if this section does not have relocs, or 2595 if this is not a code section. */ 2596 if ((sec->flags & SEC_RELOC) == 0 2597 || sec->reloc_count == 0 2598 || (sec->flags & SEC_CODE) == 0 2599 || (sec->flags & SEC_LINKER_CREATED) != 0 2600 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs, 2601 then nothing to do. */ 2602 || (bpodata == NULL 2603 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)) 2604 return TRUE; 2605 2606 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2607 2608 bpo_greg_owner = (bfd *) link_info->base_file; 2609 2610 if (bpodata != NULL) 2611 { 2612 bpo_gregs_section = bpodata->bpo_greg_section; 2613 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2614 bpono = bpodata->first_base_plus_offset_reloc; 2615 } 2616 else 2617 gregdata = NULL; 2618 2619 /* Get a copy of the native relocations. */ 2620 internal_relocs 2621 = _bfd_elf_link_read_relocs (abfd, sec, (PTR) NULL, 2622 (Elf_Internal_Rela *) NULL, 2623 link_info->keep_memory); 2624 if (internal_relocs == NULL) 2625 goto error_return; 2626 2627 /* Walk through them looking for relaxing opportunities. */ 2628 irelend = internal_relocs + sec->reloc_count; 2629 for (irel = internal_relocs; irel < irelend; irel++) 2630 { 2631 bfd_vma symval; 2632 struct elf_link_hash_entry *h = NULL; 2633 2634 /* We only process two relocs. */ 2635 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET 2636 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE) 2637 continue; 2638 2639 /* We process relocs in a distinctly different way when this is a 2640 relocatable link (for one, we don't look at symbols), so we avoid 2641 mixing its code with that for the "normal" relaxation. */ 2642 if (link_info->relocatable) 2643 { 2644 /* The only transformation in a relocatable link is to generate 2645 a full stub at the location of the stub calculated for the 2646 input section, if the relocated stub location, the end of the 2647 output section plus earlier stubs, cannot be reached. Thus 2648 relocatable linking can only lead to worse code, but it still 2649 works. */ 2650 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE) 2651 { 2652 /* If we can reach the end of the output-section and beyond 2653 any current stubs, then we don't need a stub for this 2654 reloc. The relaxed order of output stub allocation may 2655 not exactly match the straightforward order, so we always 2656 assume presence of output stubs, which will allow 2657 relaxation only on relocations indifferent to the 2658 presence of output stub allocations for other relocations 2659 and thus the order of output stub allocation. */ 2660 if (bfd_check_overflow (complain_overflow_signed, 2661 19, 2662 0, 2663 bfd_arch_bits_per_address (abfd), 2664 /* Output-stub location. */ 2665 sec->output_section->rawsize 2666 + (mmix_elf_section_data (sec 2667 ->output_section) 2668 ->pjs.stubs_size_sum) 2669 /* Location of this PUSHJ reloc. */ 2670 - (sec->output_offset + irel->r_offset) 2671 /* Don't count *this* stub twice. */ 2672 - (mmix_elf_section_data (sec) 2673 ->pjs.stub_size[pjsno] 2674 + MAX_PUSHJ_STUB_SIZE)) 2675 == bfd_reloc_ok) 2676 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2677 2678 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2679 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2680 2681 pjsno++; 2682 } 2683 2684 continue; 2685 } 2686 2687 /* Get the value of the symbol referred to by the reloc. */ 2688 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2689 { 2690 /* A local symbol. */ 2691 Elf_Internal_Sym *isym; 2692 asection *sym_sec; 2693 2694 /* Read this BFD's local symbols if we haven't already. */ 2695 if (isymbuf == NULL) 2696 { 2697 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2698 if (isymbuf == NULL) 2699 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2700 symtab_hdr->sh_info, 0, 2701 NULL, NULL, NULL); 2702 if (isymbuf == 0) 2703 goto error_return; 2704 } 2705 2706 isym = isymbuf + ELF64_R_SYM (irel->r_info); 2707 if (isym->st_shndx == SHN_UNDEF) 2708 sym_sec = bfd_und_section_ptr; 2709 else if (isym->st_shndx == SHN_ABS) 2710 sym_sec = bfd_abs_section_ptr; 2711 else if (isym->st_shndx == SHN_COMMON) 2712 sym_sec = bfd_com_section_ptr; 2713 else 2714 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2715 symval = (isym->st_value 2716 + sym_sec->output_section->vma 2717 + sym_sec->output_offset); 2718 } 2719 else 2720 { 2721 unsigned long indx; 2722 2723 /* An external symbol. */ 2724 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2725 h = elf_sym_hashes (abfd)[indx]; 2726 BFD_ASSERT (h != NULL); 2727 if (h->root.type != bfd_link_hash_defined 2728 && h->root.type != bfd_link_hash_defweak) 2729 { 2730 /* This appears to be a reference to an undefined symbol. Just 2731 ignore it--it will be caught by the regular reloc processing. 2732 We need to keep BPO reloc accounting consistent, though 2733 else we'll abort instead of emitting an error message. */ 2734 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET 2735 && gregdata != NULL) 2736 { 2737 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2738 bpono++; 2739 } 2740 continue; 2741 } 2742 2743 symval = (h->root.u.def.value 2744 + h->root.u.def.section->output_section->vma 2745 + h->root.u.def.section->output_offset); 2746 } 2747 2748 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE) 2749 { 2750 bfd_vma value = symval + irel->r_addend; 2751 bfd_vma dot 2752 = (sec->output_section->vma 2753 + sec->output_offset 2754 + irel->r_offset); 2755 bfd_vma stubaddr 2756 = (sec->output_section->vma 2757 + sec->output_offset 2758 + size 2759 + mmix_elf_section_data (sec)->pjs.stubs_size_sum); 2760 2761 if ((value & 3) == 0 2762 && bfd_check_overflow (complain_overflow_signed, 2763 19, 2764 0, 2765 bfd_arch_bits_per_address (abfd), 2766 value - dot 2767 - (value > dot 2768 ? mmix_elf_section_data (sec) 2769 ->pjs.stub_size[pjsno] 2770 : 0)) 2771 == bfd_reloc_ok) 2772 /* If the reloc fits, no stub is needed. */ 2773 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2774 else 2775 /* Maybe we can get away with just a JMP insn? */ 2776 if ((value & 3) == 0 2777 && bfd_check_overflow (complain_overflow_signed, 2778 27, 2779 0, 2780 bfd_arch_bits_per_address (abfd), 2781 value - stubaddr 2782 - (value > dot 2783 ? mmix_elf_section_data (sec) 2784 ->pjs.stub_size[pjsno] - 4 2785 : 0)) 2786 == bfd_reloc_ok) 2787 /* Yep, account for a stub consisting of a single JMP insn. */ 2788 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4; 2789 else 2790 /* Nope, go for the full insn stub. It doesn't seem useful to 2791 emit the intermediate sizes; those will only be useful for 2792 a >64M program assuming contiguous code. */ 2793 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] 2794 = MAX_PUSHJ_STUB_SIZE; 2795 2796 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2797 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2798 pjsno++; 2799 continue; 2800 } 2801 2802 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */ 2803 2804 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value 2805 = symval + irel->r_addend; 2806 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE; 2807 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2808 } 2809 2810 /* Check if that was the last BPO-reloc. If so, sort the values and 2811 calculate how many registers we need to cover them. Set the size of 2812 the linker gregs, and if the number of registers changed, indicate 2813 that we need to relax some more because we have more work to do. */ 2814 if (gregdata != NULL 2815 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0) 2816 { 2817 size_t i; 2818 bfd_vma prev_base; 2819 size_t regindex; 2820 2821 /* First, reset the remaining relocs for the next round. */ 2822 gregdata->n_remaining_bpo_relocs_this_relaxation_round 2823 = gregdata->n_bpo_relocs; 2824 2825 qsort ((PTR) gregdata->reloc_request, 2826 gregdata->n_max_bpo_relocs, 2827 sizeof (struct bpo_reloc_request), 2828 bpo_reloc_request_sort_fn); 2829 2830 /* Recalculate indexes. When we find a change (however unlikely 2831 after the initial iteration), we know we need to relax again, 2832 since items in the GREG-array are sorted by increasing value and 2833 stored in the relaxation phase. */ 2834 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2835 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2836 != i) 2837 { 2838 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2839 = i; 2840 *again = TRUE; 2841 } 2842 2843 /* Allocate register numbers (indexing from 0). Stop at the first 2844 non-valid reloc. */ 2845 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value; 2846 i < gregdata->n_bpo_relocs; 2847 i++) 2848 { 2849 if (gregdata->reloc_request[i].value > prev_base + 255) 2850 { 2851 regindex++; 2852 prev_base = gregdata->reloc_request[i].value; 2853 } 2854 gregdata->reloc_request[i].regindex = regindex; 2855 gregdata->reloc_request[i].offset 2856 = gregdata->reloc_request[i].value - prev_base; 2857 } 2858 2859 /* If it's not the same as the last time, we need to relax again, 2860 because the size of the section has changed. I'm not sure we 2861 actually need to do any adjustments since the shrinking happens 2862 at the start of this section, but better safe than sorry. */ 2863 if (gregdata->n_allocated_bpo_gregs != regindex + 1) 2864 { 2865 gregdata->n_allocated_bpo_gregs = regindex + 1; 2866 *again = TRUE; 2867 } 2868 2869 bpo_gregs_section->size = (regindex + 1) * 8; 2870 } 2871 2872 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2873 { 2874 if (! link_info->keep_memory) 2875 free (isymbuf); 2876 else 2877 { 2878 /* Cache the symbols for elf_link_input_bfd. */ 2879 symtab_hdr->contents = (unsigned char *) isymbuf; 2880 } 2881 } 2882 2883 if (internal_relocs != NULL 2884 && elf_section_data (sec)->relocs != internal_relocs) 2885 free (internal_relocs); 2886 2887 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2888 abort (); 2889 2890 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2891 { 2892 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum; 2893 *again = TRUE; 2894 } 2895 2896 return TRUE; 2897 2898 error_return: 2899 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2900 free (isymbuf); 2901 if (internal_relocs != NULL 2902 && elf_section_data (sec)->relocs != internal_relocs) 2903 free (internal_relocs); 2904 return FALSE; 2905} 2906 2907#define ELF_ARCH bfd_arch_mmix 2908#define ELF_MACHINE_CODE EM_MMIX 2909 2910/* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL). 2911 However, that's too much for something somewhere in the linker part of 2912 BFD; perhaps the start-address has to be a non-zero multiple of this 2913 number, or larger than this number. The symptom is that the linker 2914 complains: "warning: allocated section `.text' not in segment". We 2915 settle for 64k; the page-size used in examples is 8k. 2916 #define ELF_MAXPAGESIZE 0x10000 2917 2918 Unfortunately, this causes excessive padding in the supposedly small 2919 for-education programs that are the expected usage (where people would 2920 inspect output). We stick to 256 bytes just to have *some* default 2921 alignment. */ 2922#define ELF_MAXPAGESIZE 0x100 2923 2924#define TARGET_BIG_SYM bfd_elf64_mmix_vec 2925#define TARGET_BIG_NAME "elf64-mmix" 2926 2927#define elf_info_to_howto_rel NULL 2928#define elf_info_to_howto mmix_info_to_howto_rela 2929#define elf_backend_relocate_section mmix_elf_relocate_section 2930#define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook 2931#define elf_backend_gc_sweep_hook mmix_elf_gc_sweep_hook 2932 2933#define elf_backend_link_output_symbol_hook \ 2934 mmix_elf_link_output_symbol_hook 2935#define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook 2936 2937#define elf_backend_check_relocs mmix_elf_check_relocs 2938#define elf_backend_symbol_processing mmix_elf_symbol_processing 2939#define elf_backend_omit_section_dynsym \ 2940 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 2941 2942#define bfd_elf64_bfd_is_local_label_name \ 2943 mmix_elf_is_local_label_name 2944 2945#define elf_backend_may_use_rel_p 0 2946#define elf_backend_may_use_rela_p 1 2947#define elf_backend_default_use_rela_p 1 2948 2949#define elf_backend_can_gc_sections 1 2950#define elf_backend_section_from_bfd_section \ 2951 mmix_elf_section_from_bfd_section 2952 2953#define bfd_elf64_new_section_hook mmix_elf_new_section_hook 2954#define bfd_elf64_bfd_final_link mmix_elf_final_link 2955#define bfd_elf64_bfd_relax_section mmix_elf_relax_section 2956 2957#include "elf64-target.h" 2958