elf64-mmix.c revision 1.1.1.6.2.2
1 /* MMIX-specific support for 64-bit ELF. 2 Copyright (C) 2001-2020 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 *, void (*) (const char *, ...)); 176 177 static void 178 mmix_set_relaxable_size (bfd *, asection *, void *); 179 static bfd_reloc_status_type 180 mmix_elf_reloc (bfd *, arelent *, asymbol *, void *, 181 asection *, bfd *, char **); 182 static bfd_reloc_status_type 183 mmix_final_link_relocate (reloc_howto_type *, asection *, bfd_byte *, bfd_vma, 184 bfd_signed_vma, bfd_vma, const char *, asection *, 185 char **); 186 187 188 /* Watch out: this currently needs to have elements with the same index as 189 their R_MMIX_ number. */ 190 static reloc_howto_type elf_mmix_howto_table[] = 191 { 192 /* This reloc does nothing. */ 193 HOWTO (R_MMIX_NONE, /* type */ 194 0, /* rightshift */ 195 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 " please use the objcopy program to convert from" 987 " ELF or mmo," 988 " or assemble using" 989 " \"-no-expand\" (for gcc, \"-Wa,-no-expand\""); 990 mmix_elf_section_data (isec)->has_warned_pushj = TRUE; 991 return bfd_reloc_dangerous; 992 } 993 994 /* For subsequent errors, return this one, which is 995 rate-limited but looks a little bit different, 996 hopefully without affecting user-friendliness. */ 997 return bfd_reloc_overflow; 998 } 999 1000 /* The address doesn't fit, so redirect the PUSHJ to the 1001 location of the stub. */ 1002 r = mmix_elf_perform_relocation (isec, 1003 &elf_mmix_howto_table 1004 [R_MMIX_ADDR19], 1005 datap, 1006 addr, 1007 isec->output_section->vma 1008 + isec->output_offset 1009 + size 1010 + (mmix_elf_section_data (isec) 1011 ->pjs.stub_offset) 1012 - addr, 1013 error_message); 1014 if (r != bfd_reloc_ok) 1015 return r; 1016 1017 stubaddr 1018 = (isec->output_section->vma 1019 + isec->output_offset 1020 + size 1021 + mmix_elf_section_data (isec)->pjs.stub_offset); 1022 1023 /* We generate a simple JMP if that suffices, else the whole 5 1024 insn stub. */ 1025 if (bfd_check_overflow (complain_overflow_signed, 1026 elf_mmix_howto_table[R_MMIX_ADDR27].bitsize, 1027 0, 1028 bfd_arch_bits_per_address (abfd), 1029 addr + value - stubaddr) == bfd_reloc_ok) 1030 { 1031 bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents); 1032 r = mmix_elf_perform_relocation (isec, 1033 &elf_mmix_howto_table 1034 [R_MMIX_ADDR27], 1035 stubcontents, 1036 stubaddr, 1037 value + addr - stubaddr, 1038 error_message); 1039 mmix_elf_section_data (isec)->pjs.stub_offset += 4; 1040 1041 if (size + mmix_elf_section_data (isec)->pjs.stub_offset 1042 > isec->size) 1043 abort (); 1044 1045 return r; 1046 } 1047 else 1048 { 1049 /* Put a "GO $255,0" after the common sequence. */ 1050 bfd_put_32 (abfd, 1051 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1052 | 0xff00, (bfd_byte *) stubcontents + 16); 1053 1054 /* Prepare for the general code to set the first part of the 1055 linker stub, and */ 1056 value += addr; 1057 datap = stubcontents; 1058 mmix_elf_section_data (isec)->pjs.stub_offset 1059 += MAX_PUSHJ_STUB_SIZE; 1060 } 1061 } 1062 break; 1063 1064 case R_MMIX_PUSHJ: 1065 { 1066 int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 1067 1068 /* Put a "PUSHGO $N,$255,0" after the common sequence. */ 1069 bfd_put_32 (abfd, 1070 ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1071 | (inreg << 16) 1072 | 0xff00, 1073 (bfd_byte *) datap + 16); 1074 1075 /* We change to an absolute value. */ 1076 value += addr; 1077 } 1078 break; 1079 1080 case R_MMIX_JMP: 1081 /* This one is a little special. If we get here on a non-relaxing 1082 link, and the destination is actually in range, we don't need to 1083 execute the nops. 1084 If so, we fall through to the bit-fiddling relocs. 1085 1086 FIXME: bfd_check_overflow seems broken; the relocation is 1087 rightshifted before testing, so supply a zero rightshift. */ 1088 1089 if (! ((value & 3) == 0 1090 && (r = bfd_check_overflow (complain_overflow_signed, 1091 howto->bitsize, 1092 0, 1093 bfd_arch_bits_per_address (abfd), 1094 value)) == bfd_reloc_ok)) 1095 { 1096 /* If the relocation doesn't fit in a JMP, we let the NOP:s be 1097 modified below, and put a "GO $255,$255,0" after the 1098 address-loading sequence. */ 1099 bfd_put_32 (abfd, 1100 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1101 | 0xffff00, 1102 (bfd_byte *) datap + 16); 1103 1104 /* We change to an absolute value. */ 1105 value += addr; 1106 break; 1107 } 1108 /* FALLTHROUGH. */ 1109 case R_MMIX_ADDR19: 1110 case R_MMIX_ADDR27: 1111 pcrel_mmix_reloc_fits: 1112 /* These must be in range, or else we emit an error. */ 1113 if ((value & 3) == 0 1114 /* Note rightshift 0; see above. */ 1115 && (r = bfd_check_overflow (complain_overflow_signed, 1116 howto->bitsize, 1117 0, 1118 bfd_arch_bits_per_address (abfd), 1119 value)) == bfd_reloc_ok) 1120 { 1121 bfd_vma in1 1122 = bfd_get_32 (abfd, (bfd_byte *) datap); 1123 bfd_vma highbit; 1124 1125 if ((bfd_signed_vma) value < 0) 1126 { 1127 highbit = 1 << 24; 1128 value += (1 << (howto->bitsize - 1)); 1129 } 1130 else 1131 highbit = 0; 1132 1133 value >>= 2; 1134 1135 bfd_put_32 (abfd, 1136 (in1 & howto->src_mask) 1137 | highbit 1138 | (value & howto->dst_mask), 1139 (bfd_byte *) datap); 1140 1141 return bfd_reloc_ok; 1142 } 1143 else 1144 return bfd_reloc_overflow; 1145 1146 case R_MMIX_BASE_PLUS_OFFSET: 1147 { 1148 struct bpo_reloc_section_info *bpodata 1149 = mmix_elf_section_data (isec)->bpo.reloc; 1150 asection *bpo_greg_section; 1151 struct bpo_greg_section_info *gregdata; 1152 size_t bpo_index; 1153 1154 if (bpodata == NULL) 1155 { 1156 /* This shouldn't happen when linking to ELF or mmo, so 1157 this is an attempt to link to "binary", right? We 1158 can't access the output bfd, so we can't verify that 1159 assumption. We only know that the critical 1160 mmix_elf_check_common_relocs has not been called, which 1161 happens when the output format is different from the 1162 input format (and is not mmo). */ 1163 if (! mmix_elf_section_data (isec)->has_warned_bpo) 1164 { 1165 /* For the first such error per input section, produce 1166 a verbose message. */ 1167 *error_message 1168 = _("invalid input relocation when producing" 1169 " non-ELF, non-mmo format output;" 1170 " please use the objcopy program to convert from" 1171 " ELF or mmo," 1172 " or compile using the gcc-option" 1173 " \"-mno-base-addresses\"."); 1174 mmix_elf_section_data (isec)->has_warned_bpo = TRUE; 1175 return bfd_reloc_dangerous; 1176 } 1177 1178 /* For subsequent errors, return this one, which is 1179 rate-limited but looks a little bit different, 1180 hopefully without affecting user-friendliness. */ 1181 return bfd_reloc_overflow; 1182 } 1183 1184 bpo_greg_section = bpodata->bpo_greg_section; 1185 gregdata = mmix_elf_section_data (bpo_greg_section)->bpo.greg; 1186 bpo_index = gregdata->bpo_reloc_indexes[bpodata->bpo_index++]; 1187 1188 /* A consistency check: The value we now have in "relocation" must 1189 be the same as the value we stored for that relocation. It 1190 doesn't cost much, so can be left in at all times. */ 1191 if (value != gregdata->reloc_request[bpo_index].value) 1192 { 1193 _bfd_error_handler 1194 /* xgettext:c-format */ 1195 (_("%pB: Internal inconsistency error for value for\n\ 1196 linker-allocated global register: linked: %#" PRIx64 " != relaxed: %#" PRIx64 ""), 1197 isec->owner, 1198 (uint64_t) value, 1199 (uint64_t) gregdata->reloc_request[bpo_index].value); 1200 bfd_set_error (bfd_error_bad_value); 1201 return bfd_reloc_overflow; 1202 } 1203 1204 /* Then store the register number and offset for that register 1205 into datap and datap + 1 respectively. */ 1206 bfd_put_8 (abfd, 1207 gregdata->reloc_request[bpo_index].regindex 1208 + bpo_greg_section->output_section->vma / 8, 1209 datap); 1210 bfd_put_8 (abfd, 1211 gregdata->reloc_request[bpo_index].offset, 1212 ((unsigned char *) datap) + 1); 1213 return bfd_reloc_ok; 1214 } 1215 1216 case R_MMIX_REG_OR_BYTE: 1217 case R_MMIX_REG: 1218 if (value > 255) 1219 return bfd_reloc_overflow; 1220 bfd_put_8 (abfd, value, datap); 1221 return bfd_reloc_ok; 1222 1223 default: 1224 BAD_CASE (howto->type); 1225 } 1226 1227 /* This code adds the common SETL/INCML/INCMH/INCH worst-case 1228 sequence. */ 1229 1230 /* Lowest two bits must be 0. We return bfd_reloc_overflow for 1231 everything that looks strange. */ 1232 if (value & 3) 1233 flag = bfd_reloc_overflow; 1234 1235 bfd_put_32 (abfd, 1236 (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16), 1237 (bfd_byte *) datap + offs); 1238 bfd_put_32 (abfd, 1239 (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16), 1240 (bfd_byte *) datap + offs + 4); 1241 bfd_put_32 (abfd, 1242 (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16), 1243 (bfd_byte *) datap + offs + 8); 1244 bfd_put_32 (abfd, 1245 (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16), 1246 (bfd_byte *) datap + offs + 12); 1247 1248 return flag; 1249 } 1250 1251 /* Set the howto pointer for an MMIX ELF reloc (type RELA). */ 1252 1253 static bfd_boolean 1254 mmix_info_to_howto_rela (bfd *abfd, 1255 arelent *cache_ptr, 1256 Elf_Internal_Rela *dst) 1257 { 1258 unsigned int r_type; 1259 1260 r_type = ELF64_R_TYPE (dst->r_info); 1261 if (r_type >= (unsigned int) R_MMIX_max) 1262 { 1263 /* xgettext:c-format */ 1264 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 1265 abfd, r_type); 1266 bfd_set_error (bfd_error_bad_value); 1267 return FALSE; 1268 } 1269 cache_ptr->howto = &elf_mmix_howto_table[r_type]; 1270 return TRUE; 1271 } 1272 1273 /* Any MMIX-specific relocation gets here at assembly time or when linking 1274 to other formats (such as mmo); this is the relocation function from 1275 the reloc_table. We don't get here for final pure ELF linking. */ 1276 1277 static bfd_reloc_status_type 1278 mmix_elf_reloc (bfd *abfd, 1279 arelent *reloc_entry, 1280 asymbol *symbol, 1281 void * data, 1282 asection *input_section, 1283 bfd *output_bfd, 1284 char **error_message) 1285 { 1286 bfd_vma relocation; 1287 bfd_reloc_status_type r; 1288 asection *reloc_target_output_section; 1289 bfd_reloc_status_type flag = bfd_reloc_ok; 1290 bfd_vma output_base = 0; 1291 1292 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 1293 input_section, output_bfd, error_message); 1294 1295 /* If that was all that was needed (i.e. this isn't a final link, only 1296 some segment adjustments), we're done. */ 1297 if (r != bfd_reloc_continue) 1298 return r; 1299 1300 if (bfd_is_und_section (symbol->section) 1301 && (symbol->flags & BSF_WEAK) == 0 1302 && output_bfd == (bfd *) NULL) 1303 return bfd_reloc_undefined; 1304 1305 /* Is the address of the relocation really within the section? */ 1306 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 1307 return bfd_reloc_outofrange; 1308 1309 /* Work out which section the relocation is targeted at and the 1310 initial relocation command value. */ 1311 1312 /* Get symbol value. (Common symbols are special.) */ 1313 if (bfd_is_com_section (symbol->section)) 1314 relocation = 0; 1315 else 1316 relocation = symbol->value; 1317 1318 reloc_target_output_section = bfd_asymbol_section (symbol)->output_section; 1319 1320 /* Here the variable relocation holds the final address of the symbol we 1321 are relocating against, plus any addend. */ 1322 if (output_bfd) 1323 output_base = 0; 1324 else 1325 output_base = reloc_target_output_section->vma; 1326 1327 relocation += output_base + symbol->section->output_offset; 1328 1329 if (output_bfd != (bfd *) NULL) 1330 { 1331 /* Add in supplied addend. */ 1332 relocation += reloc_entry->addend; 1333 1334 /* This is a partial relocation, and we want to apply the 1335 relocation to the reloc entry rather than the raw data. 1336 Modify the reloc inplace to reflect what we now know. */ 1337 reloc_entry->addend = relocation; 1338 reloc_entry->address += input_section->output_offset; 1339 return flag; 1340 } 1341 1342 return mmix_final_link_relocate (reloc_entry->howto, input_section, 1343 data, reloc_entry->address, 1344 reloc_entry->addend, relocation, 1345 bfd_asymbol_name (symbol), 1346 reloc_target_output_section, 1347 error_message); 1348 } 1349 1350 /* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it 1352 for guidance if you're thinking of copying this. */ 1353 1354 static bfd_boolean 1355 mmix_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, 1356 struct bfd_link_info *info, 1357 bfd *input_bfd, 1358 asection *input_section, 1359 bfd_byte *contents, 1360 Elf_Internal_Rela *relocs, 1361 Elf_Internal_Sym *local_syms, 1362 asection **local_sections) 1363 { 1364 Elf_Internal_Shdr *symtab_hdr; 1365 struct elf_link_hash_entry **sym_hashes; 1366 Elf_Internal_Rela *rel; 1367 Elf_Internal_Rela *relend; 1368 bfd_size_type size; 1369 size_t pjsno = 0; 1370 1371 size = input_section->rawsize ? input_section->rawsize : input_section->size; 1372 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1373 sym_hashes = elf_sym_hashes (input_bfd); 1374 relend = relocs + input_section->reloc_count; 1375 1376 /* Zero the stub area before we start. */ 1377 if (input_section->rawsize != 0 1378 && input_section->size > input_section->rawsize) 1379 memset (contents + input_section->rawsize, 0, 1380 input_section->size - input_section->rawsize); 1381 1382 for (rel = relocs; rel < relend; rel ++) 1383 { 1384 reloc_howto_type *howto; 1385 unsigned long r_symndx; 1386 Elf_Internal_Sym *sym; 1387 asection *sec; 1388 struct elf_link_hash_entry *h; 1389 bfd_vma relocation; 1390 bfd_reloc_status_type r; 1391 const char *name = NULL; 1392 int r_type; 1393 bfd_boolean undefined_signalled = FALSE; 1394 1395 r_type = ELF64_R_TYPE (rel->r_info); 1396 1397 if (r_type == R_MMIX_GNU_VTINHERIT 1398 || r_type == R_MMIX_GNU_VTENTRY) 1399 continue; 1400 1401 r_symndx = ELF64_R_SYM (rel->r_info); 1402 1403 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info); 1404 h = NULL; 1405 sym = NULL; 1406 sec = NULL; 1407 1408 if (r_symndx < symtab_hdr->sh_info) 1409 { 1410 sym = local_syms + r_symndx; 1411 sec = local_sections [r_symndx]; 1412 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1413 1414 name = bfd_elf_string_from_elf_section (input_bfd, 1415 symtab_hdr->sh_link, 1416 sym->st_name); 1417 if (name == NULL) 1418 name = bfd_section_name (sec); 1419 } 1420 else 1421 { 1422 bfd_boolean unresolved_reloc, ignored; 1423 1424 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1425 r_symndx, symtab_hdr, sym_hashes, 1426 h, sec, relocation, 1427 unresolved_reloc, undefined_signalled, 1428 ignored); 1429 name = h->root.root.string; 1430 } 1431 1432 if (sec != NULL && discarded_section (sec)) 1433 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1434 rel, 1, relend, howto, 0, contents); 1435 1436 if (bfd_link_relocatable (info)) 1437 { 1438 /* This is a relocatable link. For most relocs we don't have to 1439 change anything, unless the reloc is against a section 1440 symbol, in which case we have to adjust according to where 1441 the section symbol winds up in the output section. */ 1442 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 1443 rel->r_addend += sec->output_offset; 1444 1445 /* For PUSHJ stub relocs however, we may need to change the 1446 reloc and the section contents, if the reloc doesn't reach 1447 beyond the end of the output section and previous stubs. 1448 Then we change the section contents to be a PUSHJ to the end 1449 of the input section plus stubs (we can do that without using 1450 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ 1451 at the stub location. */ 1452 if (r_type == R_MMIX_PUSHJ_STUBBABLE) 1453 { 1454 /* We've already checked whether we need a stub; use that 1455 knowledge. */ 1456 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno] 1457 != 0) 1458 { 1459 Elf_Internal_Rela relcpy; 1460 1461 if (mmix_elf_section_data (input_section) 1462 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE) 1463 abort (); 1464 1465 /* There's already a PUSHJ insn there, so just fill in 1466 the offset bits to the stub. */ 1467 if (mmix_final_link_relocate (elf_mmix_howto_table 1468 + R_MMIX_ADDR19, 1469 input_section, 1470 contents, 1471 rel->r_offset, 1472 0, 1473 input_section 1474 ->output_section->vma 1475 + input_section->output_offset 1476 + size 1477 + mmix_elf_section_data (input_section) 1478 ->pjs.stub_offset, 1479 NULL, NULL, NULL) != bfd_reloc_ok) 1480 return FALSE; 1481 1482 /* Put a JMP insn at the stub; it goes with the 1483 R_MMIX_JMP reloc. */ 1484 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24, 1485 contents 1486 + size 1487 + mmix_elf_section_data (input_section) 1488 ->pjs.stub_offset); 1489 1490 /* Change the reloc to be at the stub, and to a full 1491 R_MMIX_JMP reloc. */ 1492 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP); 1493 rel->r_offset 1494 = (size 1495 + mmix_elf_section_data (input_section) 1496 ->pjs.stub_offset); 1497 1498 mmix_elf_section_data (input_section)->pjs.stub_offset 1499 += MAX_PUSHJ_STUB_SIZE; 1500 1501 /* Shift this reloc to the end of the relocs to maintain 1502 the r_offset sorted reloc order. */ 1503 relcpy = *rel; 1504 memmove (rel, rel + 1, (char *) relend - (char *) rel); 1505 relend[-1] = relcpy; 1506 1507 /* Back up one reloc, or else we'd skip the next reloc 1508 in turn. */ 1509 rel--; 1510 } 1511 1512 pjsno++; 1513 } 1514 continue; 1515 } 1516 1517 r = mmix_final_link_relocate (howto, input_section, 1518 contents, rel->r_offset, 1519 rel->r_addend, relocation, name, sec, NULL); 1520 1521 if (r != bfd_reloc_ok) 1522 { 1523 const char * msg = (const char *) NULL; 1524 1525 switch (r) 1526 { 1527 case bfd_reloc_overflow: 1528 info->callbacks->reloc_overflow 1529 (info, (h ? &h->root : NULL), name, howto->name, 1530 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1531 break; 1532 1533 case bfd_reloc_undefined: 1534 /* We may have sent this message above. */ 1535 if (! undefined_signalled) 1536 info->callbacks->undefined_symbol 1537 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 1538 undefined_signalled = TRUE; 1539 break; 1540 1541 case bfd_reloc_outofrange: 1542 msg = _("internal error: out of range error"); 1543 break; 1544 1545 case bfd_reloc_notsupported: 1546 msg = _("internal error: unsupported relocation error"); 1547 break; 1548 1549 case bfd_reloc_dangerous: 1550 msg = _("internal error: dangerous relocation"); 1551 break; 1552 1553 default: 1554 msg = _("internal error: unknown error"); 1555 break; 1556 } 1557 1558 if (msg) 1559 (*info->callbacks->warning) (info, msg, name, input_bfd, 1560 input_section, rel->r_offset); 1561 } 1562 } 1563 1564 return TRUE; 1565 } 1566 1567 /* Perform a single relocation. By default we use the standard BFD 1569 routines. A few relocs we have to do ourselves. */ 1570 1571 static bfd_reloc_status_type 1572 mmix_final_link_relocate (reloc_howto_type *howto, asection *input_section, 1573 bfd_byte *contents, bfd_vma r_offset, 1574 bfd_signed_vma r_addend, bfd_vma relocation, 1575 const char *symname, asection *symsec, 1576 char **error_message) 1577 { 1578 bfd_reloc_status_type r = bfd_reloc_ok; 1579 bfd_vma addr 1580 = (input_section->output_section->vma 1581 + input_section->output_offset 1582 + r_offset); 1583 bfd_signed_vma srel 1584 = (bfd_signed_vma) relocation + r_addend; 1585 1586 switch (howto->type) 1587 { 1588 /* All these are PC-relative. */ 1589 case R_MMIX_PUSHJ_STUBBABLE: 1590 case R_MMIX_PUSHJ: 1591 case R_MMIX_CBRANCH: 1592 case R_MMIX_ADDR19: 1593 case R_MMIX_GETA: 1594 case R_MMIX_ADDR27: 1595 case R_MMIX_JMP: 1596 contents += r_offset; 1597 1598 srel -= (input_section->output_section->vma 1599 + input_section->output_offset 1600 + r_offset); 1601 1602 r = mmix_elf_perform_relocation (input_section, howto, contents, 1603 addr, srel, error_message); 1604 break; 1605 1606 case R_MMIX_BASE_PLUS_OFFSET: 1607 if (symsec == NULL) 1608 return bfd_reloc_undefined; 1609 1610 /* Check that we're not relocating against a register symbol. */ 1611 if (strcmp (bfd_section_name (symsec), 1612 MMIX_REG_CONTENTS_SECTION_NAME) == 0 1613 || strcmp (bfd_section_name (symsec), 1614 MMIX_REG_SECTION_NAME) == 0) 1615 { 1616 /* Note: This is separated out into two messages in order 1617 to ease the translation into other languages. */ 1618 if (symname == NULL || *symname == 0) 1619 _bfd_error_handler 1620 /* xgettext:c-format */ 1621 (_("%pB: base-plus-offset relocation against register symbol:" 1622 " (unknown) in %pA"), 1623 input_section->owner, symsec); 1624 else 1625 _bfd_error_handler 1626 /* xgettext:c-format */ 1627 (_("%pB: base-plus-offset relocation against register symbol:" 1628 " %s in %pA"), 1629 input_section->owner, symname, symsec); 1630 return bfd_reloc_overflow; 1631 } 1632 goto do_mmix_reloc; 1633 1634 case R_MMIX_REG_OR_BYTE: 1635 case R_MMIX_REG: 1636 /* For now, we handle these alike. They must refer to an register 1637 symbol, which is either relative to the register section and in 1638 the range 0..255, or is in the register contents section with vma 1639 regno * 8. */ 1640 1641 /* FIXME: A better way to check for reg contents section? 1642 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */ 1643 if (symsec == NULL) 1644 return bfd_reloc_undefined; 1645 1646 if (strcmp (bfd_section_name (symsec), 1647 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1648 { 1649 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1650 { 1651 /* The bfd_reloc_outofrange return value, though intuitively 1652 a better value, will not get us an error. */ 1653 return bfd_reloc_overflow; 1654 } 1655 srel /= 8; 1656 } 1657 else if (strcmp (bfd_section_name (symsec), 1658 MMIX_REG_SECTION_NAME) == 0) 1659 { 1660 if (srel < 0 || srel > 255) 1661 /* The bfd_reloc_outofrange return value, though intuitively a 1662 better value, will not get us an error. */ 1663 return bfd_reloc_overflow; 1664 } 1665 else 1666 { 1667 /* Note: This is separated out into two messages in order 1668 to ease the translation into other languages. */ 1669 if (symname == NULL || *symname == 0) 1670 _bfd_error_handler 1671 /* xgettext:c-format */ 1672 (_("%pB: register relocation against non-register symbol:" 1673 " (unknown) in %pA"), 1674 input_section->owner, symsec); 1675 else 1676 _bfd_error_handler 1677 /* xgettext:c-format */ 1678 (_("%pB: register relocation against non-register symbol:" 1679 " %s in %pA"), 1680 input_section->owner, symname, symsec); 1681 1682 /* The bfd_reloc_outofrange return value, though intuitively a 1683 better value, will not get us an error. */ 1684 return bfd_reloc_overflow; 1685 } 1686 do_mmix_reloc: 1687 contents += r_offset; 1688 r = mmix_elf_perform_relocation (input_section, howto, contents, 1689 addr, srel, error_message); 1690 break; 1691 1692 case R_MMIX_LOCAL: 1693 /* This isn't a real relocation, it's just an assertion that the 1694 final relocation value corresponds to a local register. We 1695 ignore the actual relocation; nothing is changed. */ 1696 { 1697 asection *regsec 1698 = bfd_get_section_by_name (input_section->output_section->owner, 1699 MMIX_REG_CONTENTS_SECTION_NAME); 1700 bfd_vma first_global; 1701 1702 /* Check that this is an absolute value, or a reference to the 1703 register contents section or the register (symbol) section. 1704 Absolute numbers can get here as undefined section. Undefined 1705 symbols are signalled elsewhere, so there's no conflict in us 1706 accidentally handling it. */ 1707 if (!bfd_is_abs_section (symsec) 1708 && !bfd_is_und_section (symsec) 1709 && strcmp (bfd_section_name (symsec), 1710 MMIX_REG_CONTENTS_SECTION_NAME) != 0 1711 && strcmp (bfd_section_name (symsec), 1712 MMIX_REG_SECTION_NAME) != 0) 1713 { 1714 _bfd_error_handler 1715 (_("%pB: directive LOCAL valid only with a register or absolute value"), 1716 input_section->owner); 1717 1718 return bfd_reloc_overflow; 1719 } 1720 1721 /* If we don't have a register contents section, then $255 is the 1722 first global register. */ 1723 if (regsec == NULL) 1724 first_global = 255; 1725 else 1726 { 1727 first_global = bfd_section_vma (regsec) / 8; 1728 if (strcmp (bfd_section_name (symsec), 1729 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1730 { 1731 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1732 /* The bfd_reloc_outofrange return value, though 1733 intuitively a better value, will not get us an error. */ 1734 return bfd_reloc_overflow; 1735 srel /= 8; 1736 } 1737 } 1738 1739 if ((bfd_vma) srel >= first_global) 1740 { 1741 /* FIXME: Better error message. */ 1742 _bfd_error_handler 1743 /* xgettext:c-format */ 1744 (_("%pB: LOCAL directive: " 1745 "register $%" PRId64 " is not a local register;" 1746 " first global register is $%" PRId64), 1747 input_section->owner, (int64_t) srel, (int64_t) first_global); 1748 1749 return bfd_reloc_overflow; 1750 } 1751 } 1752 r = bfd_reloc_ok; 1753 break; 1754 1755 default: 1756 r = _bfd_final_link_relocate (howto, input_section->owner, input_section, 1757 contents, r_offset, 1758 relocation, r_addend); 1759 } 1760 1761 return r; 1762 } 1763 1764 /* Return the section that should be marked against GC for a given 1766 relocation. */ 1767 1768 static asection * 1769 mmix_elf_gc_mark_hook (asection *sec, 1770 struct bfd_link_info *info, 1771 Elf_Internal_Rela *rel, 1772 struct elf_link_hash_entry *h, 1773 Elf_Internal_Sym *sym) 1774 { 1775 if (h != NULL) 1776 switch (ELF64_R_TYPE (rel->r_info)) 1777 { 1778 case R_MMIX_GNU_VTINHERIT: 1779 case R_MMIX_GNU_VTENTRY: 1780 return NULL; 1781 } 1782 1783 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1784 } 1785 1786 /* Sort register relocs to come before expanding relocs. */ 1788 1789 static int 1790 mmix_elf_sort_relocs (const void * p1, const void * p2) 1791 { 1792 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1; 1793 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2; 1794 int r1_is_reg, r2_is_reg; 1795 1796 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive 1797 insns. */ 1798 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3)) 1799 return 1; 1800 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3)) 1801 return -1; 1802 1803 r1_is_reg 1804 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE 1805 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG); 1806 r2_is_reg 1807 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE 1808 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG); 1809 if (r1_is_reg != r2_is_reg) 1810 return r2_is_reg - r1_is_reg; 1811 1812 /* Neither or both are register relocs. Then sort on full offset. */ 1813 if (r1->r_offset > r2->r_offset) 1814 return 1; 1815 else if (r1->r_offset < r2->r_offset) 1816 return -1; 1817 return 0; 1818 } 1819 1820 /* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */ 1821 1822 static bfd_boolean 1823 mmix_elf_check_common_relocs (bfd *abfd, 1824 struct bfd_link_info *info, 1825 asection *sec, 1826 const Elf_Internal_Rela *relocs) 1827 { 1828 bfd *bpo_greg_owner = NULL; 1829 asection *allocated_gregs_section = NULL; 1830 struct bpo_greg_section_info *gregdata = NULL; 1831 struct bpo_reloc_section_info *bpodata = NULL; 1832 const Elf_Internal_Rela *rel; 1833 const Elf_Internal_Rela *rel_end; 1834 1835 /* We currently have to abuse this COFF-specific member, since there's 1836 no target-machine-dedicated member. There's no alternative outside 1837 the bfd_link_info struct; we can't specialize a hash-table since 1838 they're different between ELF and mmo. */ 1839 bpo_greg_owner = (bfd *) info->base_file; 1840 1841 rel_end = relocs + sec->reloc_count; 1842 for (rel = relocs; rel < rel_end; rel++) 1843 { 1844 switch (ELF64_R_TYPE (rel->r_info)) 1845 { 1846 /* This relocation causes a GREG allocation. We need to count 1847 them, and we need to create a section for them, so we need an 1848 object to fake as the owner of that section. We can't use 1849 the ELF dynobj for this, since the ELF bits assume lots of 1850 DSO-related stuff if that member is non-NULL. */ 1851 case R_MMIX_BASE_PLUS_OFFSET: 1852 /* We don't do anything with this reloc for a relocatable link. */ 1853 if (bfd_link_relocatable (info)) 1854 break; 1855 1856 if (bpo_greg_owner == NULL) 1857 { 1858 bpo_greg_owner = abfd; 1859 info->base_file = bpo_greg_owner; 1860 } 1861 1862 if (allocated_gregs_section == NULL) 1863 allocated_gregs_section 1864 = bfd_get_section_by_name (bpo_greg_owner, 1865 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 1866 1867 if (allocated_gregs_section == NULL) 1868 { 1869 allocated_gregs_section 1870 = bfd_make_section_with_flags (bpo_greg_owner, 1871 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME, 1872 (SEC_HAS_CONTENTS 1873 | SEC_IN_MEMORY 1874 | SEC_LINKER_CREATED)); 1875 /* Setting both SEC_ALLOC and SEC_LOAD means the section is 1876 treated like any other section, and we'd get errors for 1877 address overlap with the text section. Let's set none of 1878 those flags, as that is what currently happens for usual 1879 GREG allocations, and that works. */ 1880 if (allocated_gregs_section == NULL 1881 || !bfd_set_section_alignment (allocated_gregs_section, 3)) 1882 return FALSE; 1883 1884 gregdata = (struct bpo_greg_section_info *) 1885 bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info)); 1886 if (gregdata == NULL) 1887 return FALSE; 1888 mmix_elf_section_data (allocated_gregs_section)->bpo.greg 1889 = gregdata; 1890 } 1891 else if (gregdata == NULL) 1892 gregdata 1893 = mmix_elf_section_data (allocated_gregs_section)->bpo.greg; 1894 1895 /* Get ourselves some auxiliary info for the BPO-relocs. */ 1896 if (bpodata == NULL) 1897 { 1898 /* No use doing a separate iteration pass to find the upper 1899 limit - just use the number of relocs. */ 1900 bpodata = (struct bpo_reloc_section_info *) 1901 bfd_alloc (bpo_greg_owner, 1902 sizeof (struct bpo_reloc_section_info) 1903 * (sec->reloc_count + 1)); 1904 if (bpodata == NULL) 1905 return FALSE; 1906 mmix_elf_section_data (sec)->bpo.reloc = bpodata; 1907 bpodata->first_base_plus_offset_reloc 1908 = bpodata->bpo_index 1909 = gregdata->n_max_bpo_relocs; 1910 bpodata->bpo_greg_section 1911 = allocated_gregs_section; 1912 bpodata->n_bpo_relocs_this_section = 0; 1913 } 1914 1915 bpodata->n_bpo_relocs_this_section++; 1916 gregdata->n_max_bpo_relocs++; 1917 1918 /* We don't get another chance to set this before GC; we've not 1919 set up any hook that runs before GC. */ 1920 gregdata->n_bpo_relocs 1921 = gregdata->n_max_bpo_relocs; 1922 break; 1923 1924 case R_MMIX_PUSHJ_STUBBABLE: 1925 mmix_elf_section_data (sec)->pjs.n_pushj_relocs++; 1926 break; 1927 } 1928 } 1929 1930 /* Allocate per-reloc stub storage and initialize it to the max stub 1931 size. */ 1932 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0) 1933 { 1934 size_t i; 1935 1936 mmix_elf_section_data (sec)->pjs.stub_size 1937 = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs 1938 * sizeof (mmix_elf_section_data (sec) 1939 ->pjs.stub_size[0])); 1940 if (mmix_elf_section_data (sec)->pjs.stub_size == NULL) 1941 return FALSE; 1942 1943 for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++) 1944 mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE; 1945 } 1946 1947 return TRUE; 1948 } 1949 1950 /* Look through the relocs for a section during the first phase. */ 1951 1952 static bfd_boolean 1953 mmix_elf_check_relocs (bfd *abfd, 1954 struct bfd_link_info *info, 1955 asection *sec, 1956 const Elf_Internal_Rela *relocs) 1957 { 1958 Elf_Internal_Shdr *symtab_hdr; 1959 struct elf_link_hash_entry **sym_hashes; 1960 const Elf_Internal_Rela *rel; 1961 const Elf_Internal_Rela *rel_end; 1962 1963 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1964 sym_hashes = elf_sym_hashes (abfd); 1965 1966 /* First we sort the relocs so that any register relocs come before 1967 expansion-relocs to the same insn. FIXME: Not done for mmo. */ 1968 qsort ((void *) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), 1969 mmix_elf_sort_relocs); 1970 1971 /* Do the common part. */ 1972 if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs)) 1973 return FALSE; 1974 1975 if (bfd_link_relocatable (info)) 1976 return TRUE; 1977 1978 rel_end = relocs + sec->reloc_count; 1979 for (rel = relocs; rel < rel_end; rel++) 1980 { 1981 struct elf_link_hash_entry *h; 1982 unsigned long r_symndx; 1983 1984 r_symndx = ELF64_R_SYM (rel->r_info); 1985 if (r_symndx < symtab_hdr->sh_info) 1986 h = NULL; 1987 else 1988 { 1989 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1990 while (h->root.type == bfd_link_hash_indirect 1991 || h->root.type == bfd_link_hash_warning) 1992 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1993 } 1994 1995 switch (ELF64_R_TYPE (rel->r_info)) 1996 { 1997 /* This relocation describes the C++ object vtable hierarchy. 1998 Reconstruct it for later use during GC. */ 1999 case R_MMIX_GNU_VTINHERIT: 2000 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2001 return FALSE; 2002 break; 2003 2004 /* This relocation describes which C++ vtable entries are actually 2005 used. Record for later use during GC. */ 2006 case R_MMIX_GNU_VTENTRY: 2007 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2008 return FALSE; 2009 break; 2010 } 2011 } 2012 2013 return TRUE; 2014 } 2015 2016 /* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo. 2017 Copied from elf_link_add_object_symbols. */ 2018 2019 bfd_boolean 2020 _bfd_mmix_check_all_relocs (bfd *abfd, struct bfd_link_info *info) 2021 { 2022 asection *o; 2023 2024 for (o = abfd->sections; o != NULL; o = o->next) 2025 { 2026 Elf_Internal_Rela *internal_relocs; 2027 bfd_boolean ok; 2028 2029 if ((o->flags & SEC_RELOC) == 0 2030 || o->reloc_count == 0 2031 || ((info->strip == strip_all || info->strip == strip_debugger) 2032 && (o->flags & SEC_DEBUGGING) != 0) 2033 || bfd_is_abs_section (o->output_section)) 2034 continue; 2035 2036 internal_relocs 2037 = _bfd_elf_link_read_relocs (abfd, o, NULL, 2038 (Elf_Internal_Rela *) NULL, 2039 info->keep_memory); 2040 if (internal_relocs == NULL) 2041 return FALSE; 2042 2043 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs); 2044 2045 if (! info->keep_memory) 2046 free (internal_relocs); 2047 2048 if (! ok) 2049 return FALSE; 2050 } 2051 2052 return TRUE; 2053 } 2054 2055 /* Change symbols relative to the reg contents section to instead be to 2057 the register section, and scale them down to correspond to the register 2058 number. */ 2059 2060 static int 2061 mmix_elf_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED, 2062 const char *name ATTRIBUTE_UNUSED, 2063 Elf_Internal_Sym *sym, 2064 asection *input_sec, 2065 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) 2066 { 2067 if (input_sec != NULL 2068 && input_sec->name != NULL 2069 && ELF_ST_TYPE (sym->st_info) != STT_SECTION 2070 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0) 2071 { 2072 sym->st_value /= 8; 2073 sym->st_shndx = SHN_REGISTER; 2074 } 2075 2076 return 1; 2077 } 2078 2079 /* We fake a register section that holds values that are register numbers. 2080 Having a SHN_REGISTER and register section translates better to other 2081 formats (e.g. mmo) than for example a STT_REGISTER attribute. 2082 This section faking is based on a construct in elf32-mips.c. */ 2083 static asection mmix_elf_reg_section; 2084 static asymbol mmix_elf_reg_section_symbol; 2085 static asymbol *mmix_elf_reg_section_symbol_ptr; 2086 2087 /* Handle the special section numbers that a symbol may use. */ 2088 2089 void 2090 mmix_elf_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, asymbol *asym) 2091 { 2092 elf_symbol_type *elfsym; 2093 2094 elfsym = (elf_symbol_type *) asym; 2095 switch (elfsym->internal_elf_sym.st_shndx) 2096 { 2097 case SHN_REGISTER: 2098 if (mmix_elf_reg_section.name == NULL) 2099 { 2100 /* Initialize the register section. */ 2101 mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME; 2102 mmix_elf_reg_section.flags = SEC_NO_FLAGS; 2103 mmix_elf_reg_section.output_section = &mmix_elf_reg_section; 2104 mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol; 2105 mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr; 2106 mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME; 2107 mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM; 2108 mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section; 2109 mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol; 2110 } 2111 asym->section = &mmix_elf_reg_section; 2112 break; 2113 2114 default: 2115 break; 2116 } 2117 } 2118 2119 /* Given a BFD section, try to locate the corresponding ELF section 2120 index. */ 2121 2122 static bfd_boolean 2123 mmix_elf_section_from_bfd_section (bfd * abfd ATTRIBUTE_UNUSED, 2124 asection * sec, 2125 int * retval) 2126 { 2127 if (strcmp (bfd_section_name (sec), MMIX_REG_SECTION_NAME) == 0) 2128 *retval = SHN_REGISTER; 2129 else 2130 return FALSE; 2131 2132 return TRUE; 2133 } 2134 2135 /* Hook called by the linker routine which adds symbols from an object 2136 file. We must handle the special SHN_REGISTER section number here. 2137 2138 We also check that we only have *one* each of the section-start 2139 symbols, since otherwise having two with the same value would cause 2140 them to be "merged", but with the contents serialized. */ 2141 2142 static bfd_boolean 2143 mmix_elf_add_symbol_hook (bfd *abfd, 2144 struct bfd_link_info *info ATTRIBUTE_UNUSED, 2145 Elf_Internal_Sym *sym, 2146 const char **namep ATTRIBUTE_UNUSED, 2147 flagword *flagsp ATTRIBUTE_UNUSED, 2148 asection **secp, 2149 bfd_vma *valp ATTRIBUTE_UNUSED) 2150 { 2151 if (sym->st_shndx == SHN_REGISTER) 2152 { 2153 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME); 2154 (*secp)->flags |= SEC_LINKER_CREATED; 2155 } 2156 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.' 2157 && CONST_STRNEQ (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) 2158 { 2159 /* See if we have another one. */ 2160 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash, 2161 *namep, 2162 FALSE, 2163 FALSE, 2164 FALSE); 2165 2166 if (h != NULL && h->type != bfd_link_hash_undefined) 2167 { 2168 /* How do we get the asymbol (or really: the filename) from h? 2169 h->u.def.section->owner is NULL. */ 2170 _bfd_error_handler 2171 /* xgettext:c-format */ 2172 (_("%pB: error: multiple definition of `%s'; start of %s " 2173 "is set in a earlier linked file"), 2174 abfd, *namep, 2175 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)); 2176 bfd_set_error (bfd_error_bad_value); 2177 return FALSE; 2178 } 2179 } 2180 2181 return TRUE; 2182 } 2183 2184 /* We consider symbols matching "L.*:[0-9]+" to be local symbols. */ 2185 2186 static bfd_boolean 2187 mmix_elf_is_local_label_name (bfd *abfd, const char *name) 2188 { 2189 const char *colpos; 2190 int digits; 2191 2192 /* Also include the default local-label definition. */ 2193 if (_bfd_elf_is_local_label_name (abfd, name)) 2194 return TRUE; 2195 2196 if (*name != 'L') 2197 return FALSE; 2198 2199 /* If there's no ":", or more than one, it's not a local symbol. */ 2200 colpos = strchr (name, ':'); 2201 if (colpos == NULL || strchr (colpos + 1, ':') != NULL) 2202 return FALSE; 2203 2204 /* Check that there are remaining characters and that they are digits. */ 2205 if (colpos[1] == 0) 2206 return FALSE; 2207 2208 digits = strspn (colpos + 1, "0123456789"); 2209 return digits != 0 && colpos[1 + digits] == 0; 2210 } 2211 2212 /* We get rid of the register section here. */ 2213 2214 bfd_boolean 2215 mmix_elf_final_link (bfd *abfd, struct bfd_link_info *info) 2216 { 2217 /* We never output a register section, though we create one for 2218 temporary measures. Check that nobody entered contents into it. */ 2219 asection *reg_section; 2220 2221 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME); 2222 2223 if (reg_section != NULL) 2224 { 2225 /* FIXME: Pass error state gracefully. */ 2226 if (bfd_section_flags (reg_section) & SEC_HAS_CONTENTS) 2227 _bfd_abort (__FILE__, __LINE__, _("register section has contents\n")); 2228 2229 /* Really remove the section, if it hasn't already been done. */ 2230 if (!bfd_section_removed_from_list (abfd, reg_section)) 2231 { 2232 bfd_section_list_remove (abfd, reg_section); 2233 --abfd->section_count; 2234 } 2235 } 2236 2237 if (! bfd_elf_final_link (abfd, info)) 2238 return FALSE; 2239 2240 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by 2241 the regular linker machinery. We do it here, like other targets with 2242 special sections. */ 2243 if (info->base_file != NULL) 2244 { 2245 asection *greg_section 2246 = bfd_get_section_by_name ((bfd *) info->base_file, 2247 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2248 if (!bfd_set_section_contents (abfd, 2249 greg_section->output_section, 2250 greg_section->contents, 2251 (file_ptr) greg_section->output_offset, 2252 greg_section->size)) 2253 return FALSE; 2254 } 2255 return TRUE; 2256 } 2257 2258 /* We need to include the maximum size of PUSHJ-stubs in the initial 2259 section size. This is expected to shrink during linker relaxation. */ 2260 2261 static void 2262 mmix_set_relaxable_size (bfd *abfd ATTRIBUTE_UNUSED, 2263 asection *sec, 2264 void *ptr) 2265 { 2266 struct bfd_link_info *info = ptr; 2267 2268 /* Make sure we only do this for section where we know we want this, 2269 otherwise we might end up resetting the size of COMMONs. */ 2270 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0) 2271 return; 2272 2273 sec->rawsize = sec->size; 2274 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2275 * MAX_PUSHJ_STUB_SIZE); 2276 2277 /* For use in relocatable link, we start with a max stubs size. See 2278 mmix_elf_relax_section. */ 2279 if (bfd_link_relocatable (info) && sec->output_section) 2280 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum 2281 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2282 * MAX_PUSHJ_STUB_SIZE); 2283 } 2284 2285 /* Initialize stuff for the linker-generated GREGs to match 2286 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */ 2287 2288 bfd_boolean 2289 _bfd_mmix_before_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2290 struct bfd_link_info *info) 2291 { 2292 asection *bpo_gregs_section; 2293 bfd *bpo_greg_owner; 2294 struct bpo_greg_section_info *gregdata; 2295 size_t n_gregs; 2296 bfd_vma gregs_size; 2297 size_t i; 2298 size_t *bpo_reloc_indexes; 2299 bfd *ibfd; 2300 2301 /* Set the initial size of sections. */ 2302 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 2303 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info); 2304 2305 /* The bpo_greg_owner bfd is supposed to have been set by 2306 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen. 2307 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2308 bpo_greg_owner = (bfd *) info->base_file; 2309 if (bpo_greg_owner == NULL) 2310 return TRUE; 2311 2312 bpo_gregs_section 2313 = bfd_get_section_by_name (bpo_greg_owner, 2314 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2315 2316 if (bpo_gregs_section == NULL) 2317 return TRUE; 2318 2319 /* We use the target-data handle in the ELF section data. */ 2320 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2321 if (gregdata == NULL) 2322 return FALSE; 2323 2324 n_gregs = gregdata->n_bpo_relocs; 2325 gregdata->n_allocated_bpo_gregs = n_gregs; 2326 2327 /* When this reaches zero during relaxation, all entries have been 2328 filled in and the size of the linker gregs can be calculated. */ 2329 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs; 2330 2331 /* Set the zeroth-order estimate for the GREGs size. */ 2332 gregs_size = n_gregs * 8; 2333 2334 if (!bfd_set_section_size (bpo_gregs_section, gregs_size)) 2335 return FALSE; 2336 2337 /* Allocate and set up the GREG arrays. They're filled in at relaxation 2338 time. Note that we must use the max number ever noted for the array, 2339 since the index numbers were created before GC. */ 2340 gregdata->reloc_request 2341 = bfd_zalloc (bpo_greg_owner, 2342 sizeof (struct bpo_reloc_request) 2343 * gregdata->n_max_bpo_relocs); 2344 2345 gregdata->bpo_reloc_indexes 2346 = bpo_reloc_indexes 2347 = bfd_alloc (bpo_greg_owner, 2348 gregdata->n_max_bpo_relocs 2349 * sizeof (size_t)); 2350 if (bpo_reloc_indexes == NULL) 2351 return FALSE; 2352 2353 /* The default order is an identity mapping. */ 2354 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2355 { 2356 bpo_reloc_indexes[i] = i; 2357 gregdata->reloc_request[i].bpo_reloc_no = i; 2358 } 2359 2360 return TRUE; 2361 } 2362 2363 /* Fill in contents in the linker allocated gregs. Everything is 2365 calculated at this point; we just move the contents into place here. */ 2366 2367 bfd_boolean 2368 _bfd_mmix_after_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2369 struct bfd_link_info *link_info) 2370 { 2371 asection *bpo_gregs_section; 2372 bfd *bpo_greg_owner; 2373 struct bpo_greg_section_info *gregdata; 2374 size_t n_gregs; 2375 size_t i, j; 2376 size_t lastreg; 2377 bfd_byte *contents; 2378 2379 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs 2380 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such 2381 object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2382 bpo_greg_owner = (bfd *) link_info->base_file; 2383 if (bpo_greg_owner == NULL) 2384 return TRUE; 2385 2386 bpo_gregs_section 2387 = bfd_get_section_by_name (bpo_greg_owner, 2388 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2389 2390 /* This can't happen without DSO handling. When DSOs are handled 2391 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such 2392 section. */ 2393 if (bpo_gregs_section == NULL) 2394 return TRUE; 2395 2396 /* We use the target-data handle in the ELF section data. */ 2397 2398 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2399 if (gregdata == NULL) 2400 return FALSE; 2401 2402 n_gregs = gregdata->n_allocated_bpo_gregs; 2403 2404 bpo_gregs_section->contents 2405 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size); 2406 if (contents == NULL) 2407 return FALSE; 2408 2409 /* Sanity check: If these numbers mismatch, some relocation has not been 2410 accounted for and the rest of gregdata is probably inconsistent. 2411 It's a bug, but it's more helpful to identify it than segfaulting 2412 below. */ 2413 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round 2414 != gregdata->n_bpo_relocs) 2415 { 2416 _bfd_error_handler 2417 /* xgettext:c-format */ 2418 (_("internal inconsistency: remaining %lu != max %lu;" 2419 " please report this bug"), 2420 (unsigned long) gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2421 (unsigned long) gregdata->n_bpo_relocs); 2422 return FALSE; 2423 } 2424 2425 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++) 2426 if (gregdata->reloc_request[i].regindex != lastreg) 2427 { 2428 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value, 2429 contents + j * 8); 2430 lastreg = gregdata->reloc_request[i].regindex; 2431 j++; 2432 } 2433 2434 return TRUE; 2435 } 2436 2437 /* Sort valid relocs to come before non-valid relocs, then on increasing 2438 value. */ 2439 2440 static int 2441 bpo_reloc_request_sort_fn (const void * p1, const void * p2) 2442 { 2443 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1; 2444 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2; 2445 2446 /* Primary function is validity; non-valid relocs sorted after valid 2447 ones. */ 2448 if (r1->valid != r2->valid) 2449 return r2->valid - r1->valid; 2450 2451 /* Then sort on value. Don't simplify and return just the difference of 2452 the values: the upper bits of the 64-bit value would be truncated on 2453 a host with 32-bit ints. */ 2454 if (r1->value != r2->value) 2455 return r1->value > r2->value ? 1 : -1; 2456 2457 /* As a last re-sort, use the relocation number, so we get a stable 2458 sort. The *addresses* aren't stable since items are swapped during 2459 sorting. It depends on the qsort implementation if this actually 2460 happens. */ 2461 return r1->bpo_reloc_no > r2->bpo_reloc_no 2462 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0); 2463 } 2464 2465 /* For debug use only. Dumps the global register allocations resulting 2466 from base-plus-offset relocs. */ 2467 2468 void 2469 mmix_dump_bpo_gregs (struct bfd_link_info *link_info, 2470 void (*pf) (const char *fmt, ...)) 2471 { 2472 bfd *bpo_greg_owner; 2473 asection *bpo_gregs_section; 2474 struct bpo_greg_section_info *gregdata; 2475 unsigned int i; 2476 2477 if (link_info == NULL || link_info->base_file == NULL) 2478 return; 2479 2480 bpo_greg_owner = (bfd *) link_info->base_file; 2481 2482 bpo_gregs_section 2483 = bfd_get_section_by_name (bpo_greg_owner, 2484 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2485 2486 if (bpo_gregs_section == NULL) 2487 return; 2488 2489 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2490 if (gregdata == NULL) 2491 return; 2492 2493 if (pf == NULL) 2494 pf = _bfd_error_handler; 2495 2496 /* These format strings are not translated. They are for debug purposes 2497 only and never displayed to an end user. Should they escape, we 2498 surely want them in original. */ 2499 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\ 2500 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs, 2501 gregdata->n_max_bpo_relocs, 2502 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2503 gregdata->n_allocated_bpo_gregs); 2504 2505 if (gregdata->reloc_request) 2506 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2507 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n", 2508 i, 2509 (gregdata->bpo_reloc_indexes != NULL 2510 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1), 2511 gregdata->reloc_request[i].bpo_reloc_no, 2512 gregdata->reloc_request[i].valid, 2513 2514 (unsigned long) (gregdata->reloc_request[i].value >> 32), 2515 (unsigned long) gregdata->reloc_request[i].value, 2516 gregdata->reloc_request[i].regindex, 2517 gregdata->reloc_request[i].offset); 2518 } 2519 2520 /* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and 2521 when the last such reloc is done, an index-array is sorted according to 2522 the values and iterated over to produce register numbers (indexed by 0 2523 from the first allocated register number) and offsets for use in real 2524 relocation. (N.B.: Relocatable runs are handled, not just punted.) 2525 2526 PUSHJ stub accounting is also done here. 2527 2528 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 2529 2530 static bfd_boolean 2531 mmix_elf_relax_section (bfd *abfd, 2532 asection *sec, 2533 struct bfd_link_info *link_info, 2534 bfd_boolean *again) 2535 { 2536 Elf_Internal_Shdr *symtab_hdr; 2537 Elf_Internal_Rela *internal_relocs; 2538 Elf_Internal_Rela *irel, *irelend; 2539 asection *bpo_gregs_section = NULL; 2540 struct bpo_greg_section_info *gregdata; 2541 struct bpo_reloc_section_info *bpodata 2542 = mmix_elf_section_data (sec)->bpo.reloc; 2543 /* The initialization is to quiet compiler warnings. The value is to 2544 spot a missing actual initialization. */ 2545 size_t bpono = (size_t) -1; 2546 size_t pjsno = 0; 2547 Elf_Internal_Sym *isymbuf = NULL; 2548 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size; 2549 2550 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0; 2551 2552 /* Assume nothing changes. */ 2553 *again = FALSE; 2554 2555 /* We don't have to do anything if this section does not have relocs, or 2556 if this is not a code section. */ 2557 if ((sec->flags & SEC_RELOC) == 0 2558 || sec->reloc_count == 0 2559 || (sec->flags & SEC_CODE) == 0 2560 || (sec->flags & SEC_LINKER_CREATED) != 0 2561 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs, 2562 then nothing to do. */ 2563 || (bpodata == NULL 2564 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)) 2565 return TRUE; 2566 2567 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2568 2569 if (bpodata != NULL) 2570 { 2571 bpo_gregs_section = bpodata->bpo_greg_section; 2572 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2573 bpono = bpodata->first_base_plus_offset_reloc; 2574 } 2575 else 2576 gregdata = NULL; 2577 2578 /* Get a copy of the native relocations. */ 2579 internal_relocs 2580 = _bfd_elf_link_read_relocs (abfd, sec, NULL, 2581 (Elf_Internal_Rela *) NULL, 2582 link_info->keep_memory); 2583 if (internal_relocs == NULL) 2584 goto error_return; 2585 2586 /* Walk through them looking for relaxing opportunities. */ 2587 irelend = internal_relocs + sec->reloc_count; 2588 for (irel = internal_relocs; irel < irelend; irel++) 2589 { 2590 bfd_vma symval; 2591 struct elf_link_hash_entry *h = NULL; 2592 2593 /* We only process two relocs. */ 2594 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET 2595 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE) 2596 continue; 2597 2598 /* We process relocs in a distinctly different way when this is a 2599 relocatable link (for one, we don't look at symbols), so we avoid 2600 mixing its code with that for the "normal" relaxation. */ 2601 if (bfd_link_relocatable (link_info)) 2602 { 2603 /* The only transformation in a relocatable link is to generate 2604 a full stub at the location of the stub calculated for the 2605 input section, if the relocated stub location, the end of the 2606 output section plus earlier stubs, cannot be reached. Thus 2607 relocatable linking can only lead to worse code, but it still 2608 works. */ 2609 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE) 2610 { 2611 /* If we can reach the end of the output-section and beyond 2612 any current stubs, then we don't need a stub for this 2613 reloc. The relaxed order of output stub allocation may 2614 not exactly match the straightforward order, so we always 2615 assume presence of output stubs, which will allow 2616 relaxation only on relocations indifferent to the 2617 presence of output stub allocations for other relocations 2618 and thus the order of output stub allocation. */ 2619 if (bfd_check_overflow (complain_overflow_signed, 2620 19, 2621 0, 2622 bfd_arch_bits_per_address (abfd), 2623 /* Output-stub location. */ 2624 sec->output_section->rawsize 2625 + (mmix_elf_section_data (sec 2626 ->output_section) 2627 ->pjs.stubs_size_sum) 2628 /* Location of this PUSHJ reloc. */ 2629 - (sec->output_offset + irel->r_offset) 2630 /* Don't count *this* stub twice. */ 2631 - (mmix_elf_section_data (sec) 2632 ->pjs.stub_size[pjsno] 2633 + MAX_PUSHJ_STUB_SIZE)) 2634 == bfd_reloc_ok) 2635 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2636 2637 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2638 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2639 2640 pjsno++; 2641 } 2642 2643 continue; 2644 } 2645 2646 /* Get the value of the symbol referred to by the reloc. */ 2647 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2648 { 2649 /* A local symbol. */ 2650 Elf_Internal_Sym *isym; 2651 asection *sym_sec; 2652 2653 /* Read this BFD's local symbols if we haven't already. */ 2654 if (isymbuf == NULL) 2655 { 2656 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2657 if (isymbuf == NULL) 2658 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2659 symtab_hdr->sh_info, 0, 2660 NULL, NULL, NULL); 2661 if (isymbuf == 0) 2662 goto error_return; 2663 } 2664 2665 isym = isymbuf + ELF64_R_SYM (irel->r_info); 2666 if (isym->st_shndx == SHN_UNDEF) 2667 sym_sec = bfd_und_section_ptr; 2668 else if (isym->st_shndx == SHN_ABS) 2669 sym_sec = bfd_abs_section_ptr; 2670 else if (isym->st_shndx == SHN_COMMON) 2671 sym_sec = bfd_com_section_ptr; 2672 else 2673 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2674 symval = (isym->st_value 2675 + sym_sec->output_section->vma 2676 + sym_sec->output_offset); 2677 } 2678 else 2679 { 2680 unsigned long indx; 2681 2682 /* An external symbol. */ 2683 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2684 h = elf_sym_hashes (abfd)[indx]; 2685 BFD_ASSERT (h != NULL); 2686 if (h->root.type == bfd_link_hash_undefweak) 2687 /* FIXME: for R_MMIX_PUSHJ_STUBBABLE, there are alternatives to 2688 the canonical value 0 for an unresolved weak symbol to 2689 consider: as the debug-friendly approach, resolve to "abort" 2690 (or a port-specific function), or as the space-friendly 2691 approach resolve to the next instruction (like some other 2692 ports, notably ARM and AArch64). These alternatives require 2693 matching code in mmix_elf_perform_relocation or its caller. */ 2694 symval = 0; 2695 else if (h->root.type == bfd_link_hash_defined 2696 || h->root.type == bfd_link_hash_defweak) 2697 symval = (h->root.u.def.value 2698 + h->root.u.def.section->output_section->vma 2699 + h->root.u.def.section->output_offset); 2700 else 2701 { 2702 /* This appears to be a reference to an undefined symbol. Just 2703 ignore it--it will be caught by the regular reloc processing. 2704 We need to keep BPO reloc accounting consistent, though 2705 else we'll abort instead of emitting an error message. */ 2706 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET 2707 && gregdata != NULL) 2708 { 2709 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2710 bpono++; 2711 } 2712 continue; 2713 } 2714 } 2715 2716 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE) 2717 { 2718 bfd_vma value = symval + irel->r_addend; 2719 bfd_vma dot 2720 = (sec->output_section->vma 2721 + sec->output_offset 2722 + irel->r_offset); 2723 bfd_vma stubaddr 2724 = (sec->output_section->vma 2725 + sec->output_offset 2726 + size 2727 + mmix_elf_section_data (sec)->pjs.stubs_size_sum); 2728 2729 if ((value & 3) == 0 2730 && bfd_check_overflow (complain_overflow_signed, 2731 19, 2732 0, 2733 bfd_arch_bits_per_address (abfd), 2734 value - dot 2735 - (value > dot 2736 ? mmix_elf_section_data (sec) 2737 ->pjs.stub_size[pjsno] 2738 : 0)) 2739 == bfd_reloc_ok) 2740 /* If the reloc fits, no stub is needed. */ 2741 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2742 else 2743 /* Maybe we can get away with just a JMP insn? */ 2744 if ((value & 3) == 0 2745 && bfd_check_overflow (complain_overflow_signed, 2746 27, 2747 0, 2748 bfd_arch_bits_per_address (abfd), 2749 value - stubaddr 2750 - (value > dot 2751 ? mmix_elf_section_data (sec) 2752 ->pjs.stub_size[pjsno] - 4 2753 : 0)) 2754 == bfd_reloc_ok) 2755 /* Yep, account for a stub consisting of a single JMP insn. */ 2756 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4; 2757 else 2758 /* Nope, go for the full insn stub. It doesn't seem useful to 2759 emit the intermediate sizes; those will only be useful for 2760 a >64M program assuming contiguous code. */ 2761 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] 2762 = MAX_PUSHJ_STUB_SIZE; 2763 2764 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2765 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2766 pjsno++; 2767 continue; 2768 } 2769 2770 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */ 2771 2772 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value 2773 = symval + irel->r_addend; 2774 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE; 2775 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2776 } 2777 2778 /* Check if that was the last BPO-reloc. If so, sort the values and 2779 calculate how many registers we need to cover them. Set the size of 2780 the linker gregs, and if the number of registers changed, indicate 2781 that we need to relax some more because we have more work to do. */ 2782 if (gregdata != NULL 2783 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0) 2784 { 2785 size_t i; 2786 bfd_vma prev_base; 2787 size_t regindex; 2788 2789 /* First, reset the remaining relocs for the next round. */ 2790 gregdata->n_remaining_bpo_relocs_this_relaxation_round 2791 = gregdata->n_bpo_relocs; 2792 2793 qsort (gregdata->reloc_request, 2794 gregdata->n_max_bpo_relocs, 2795 sizeof (struct bpo_reloc_request), 2796 bpo_reloc_request_sort_fn); 2797 2798 /* Recalculate indexes. When we find a change (however unlikely 2799 after the initial iteration), we know we need to relax again, 2800 since items in the GREG-array are sorted by increasing value and 2801 stored in the relaxation phase. */ 2802 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2803 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2804 != i) 2805 { 2806 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2807 = i; 2808 *again = TRUE; 2809 } 2810 2811 /* Allocate register numbers (indexing from 0). Stop at the first 2812 non-valid reloc. */ 2813 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value; 2814 i < gregdata->n_bpo_relocs; 2815 i++) 2816 { 2817 if (gregdata->reloc_request[i].value > prev_base + 255) 2818 { 2819 regindex++; 2820 prev_base = gregdata->reloc_request[i].value; 2821 } 2822 gregdata->reloc_request[i].regindex = regindex; 2823 gregdata->reloc_request[i].offset 2824 = gregdata->reloc_request[i].value - prev_base; 2825 } 2826 2827 /* If it's not the same as the last time, we need to relax again, 2828 because the size of the section has changed. I'm not sure we 2829 actually need to do any adjustments since the shrinking happens 2830 at the start of this section, but better safe than sorry. */ 2831 if (gregdata->n_allocated_bpo_gregs != regindex + 1) 2832 { 2833 gregdata->n_allocated_bpo_gregs = regindex + 1; 2834 *again = TRUE; 2835 } 2836 2837 bpo_gregs_section->size = (regindex + 1) * 8; 2838 } 2839 2840 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2841 { 2842 if (! link_info->keep_memory) 2843 free (isymbuf); 2844 else 2845 { 2846 /* Cache the symbols for elf_link_input_bfd. */ 2847 symtab_hdr->contents = (unsigned char *) isymbuf; 2848 } 2849 } 2850 2851 BFD_ASSERT(pjsno == mmix_elf_section_data (sec)->pjs.n_pushj_relocs); 2852 2853 if (internal_relocs != NULL 2854 && elf_section_data (sec)->relocs != internal_relocs) 2855 free (internal_relocs); 2856 2857 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2858 abort (); 2859 2860 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2861 { 2862 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum; 2863 *again = TRUE; 2864 } 2865 2866 return TRUE; 2867 2868 error_return: 2869 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2870 free (isymbuf); 2871 if (internal_relocs != NULL 2872 && elf_section_data (sec)->relocs != internal_relocs) 2873 free (internal_relocs); 2874 return FALSE; 2875 } 2876 2877 #define ELF_ARCH bfd_arch_mmix 2879 #define ELF_MACHINE_CODE EM_MMIX 2880 2881 /* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL). 2882 However, that's too much for something somewhere in the linker part of 2883 BFD; perhaps the start-address has to be a non-zero multiple of this 2884 number, or larger than this number. The symptom is that the linker 2885 complains: "warning: allocated section `.text' not in segment". We 2886 settle for 64k; the page-size used in examples is 8k. 2887 #define ELF_MAXPAGESIZE 0x10000 2888 2889 Unfortunately, this causes excessive padding in the supposedly small 2890 for-education programs that are the expected usage (where people would 2891 inspect output). We stick to 256 bytes just to have *some* default 2892 alignment. */ 2893 #define ELF_MAXPAGESIZE 0x100 2894 2895 #define TARGET_BIG_SYM mmix_elf64_vec 2896 #define TARGET_BIG_NAME "elf64-mmix" 2897 2898 #define elf_info_to_howto_rel NULL 2899 #define elf_info_to_howto mmix_info_to_howto_rela 2900 #define elf_backend_relocate_section mmix_elf_relocate_section 2901 #define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook 2902 2903 #define elf_backend_link_output_symbol_hook \ 2904 mmix_elf_link_output_symbol_hook 2905 #define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook 2906 2907 #define elf_backend_check_relocs mmix_elf_check_relocs 2908 #define elf_backend_symbol_processing mmix_elf_symbol_processing 2909 #define elf_backend_omit_section_dynsym _bfd_elf_omit_section_dynsym_all 2910 2911 #define bfd_elf64_bfd_copy_link_hash_symbol_type \ 2912 _bfd_generic_copy_link_hash_symbol_type 2913 2914 #define bfd_elf64_bfd_is_local_label_name \ 2915 mmix_elf_is_local_label_name 2916 2917 #define elf_backend_may_use_rel_p 0 2918 #define elf_backend_may_use_rela_p 1 2919 #define elf_backend_default_use_rela_p 1 2920 2921 #define elf_backend_can_gc_sections 1 2922 #define elf_backend_section_from_bfd_section \ 2923 mmix_elf_section_from_bfd_section 2924 2925 #define bfd_elf64_new_section_hook mmix_elf_new_section_hook 2926 #define bfd_elf64_bfd_final_link mmix_elf_final_link 2927 #define bfd_elf64_bfd_relax_section mmix_elf_relax_section 2928 2929 #include "elf64-target.h" 2930
Indexes created Fri May 01 00:23:41 UTC 2026