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