elf64-mmix.c revision 1.1.1.6
1 /* MMIX-specific support for 64-bit ELF. 2 Copyright (C) 2001-2018 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 "\n Please use the objcopy program to convert from" 987 " ELF or mmo," 988 "\n or assemble using" 989 " \"-no-expand\" (for gcc, \"-Wa,-no-expand\""); 990 mmix_elf_section_data (isec)->has_warned_pushj = TRUE; 991 return bfd_reloc_dangerous; 992 } 993 994 /* For subsequent errors, return this one, which is 995 rate-limited but looks a little bit different, 996 hopefully without affecting user-friendliness. */ 997 return bfd_reloc_overflow; 998 } 999 1000 /* The address doesn't fit, so redirect the PUSHJ to the 1001 location of the stub. */ 1002 r = mmix_elf_perform_relocation (isec, 1003 &elf_mmix_howto_table 1004 [R_MMIX_ADDR19], 1005 datap, 1006 addr, 1007 isec->output_section->vma 1008 + isec->output_offset 1009 + size 1010 + (mmix_elf_section_data (isec) 1011 ->pjs.stub_offset) 1012 - addr, 1013 error_message); 1014 if (r != bfd_reloc_ok) 1015 return r; 1016 1017 stubaddr 1018 = (isec->output_section->vma 1019 + isec->output_offset 1020 + size 1021 + mmix_elf_section_data (isec)->pjs.stub_offset); 1022 1023 /* We generate a simple JMP if that suffices, else the whole 5 1024 insn stub. */ 1025 if (bfd_check_overflow (complain_overflow_signed, 1026 elf_mmix_howto_table[R_MMIX_ADDR27].bitsize, 1027 0, 1028 bfd_arch_bits_per_address (abfd), 1029 addr + value - stubaddr) == bfd_reloc_ok) 1030 { 1031 bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents); 1032 r = mmix_elf_perform_relocation (isec, 1033 &elf_mmix_howto_table 1034 [R_MMIX_ADDR27], 1035 stubcontents, 1036 stubaddr, 1037 value + addr - stubaddr, 1038 error_message); 1039 mmix_elf_section_data (isec)->pjs.stub_offset += 4; 1040 1041 if (size + mmix_elf_section_data (isec)->pjs.stub_offset 1042 > isec->size) 1043 abort (); 1044 1045 return r; 1046 } 1047 else 1048 { 1049 /* Put a "GO $255,0" after the common sequence. */ 1050 bfd_put_32 (abfd, 1051 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1052 | 0xff00, (bfd_byte *) stubcontents + 16); 1053 1054 /* Prepare for the general code to set the first part of the 1055 linker stub, and */ 1056 value += addr; 1057 datap = stubcontents; 1058 mmix_elf_section_data (isec)->pjs.stub_offset 1059 += MAX_PUSHJ_STUB_SIZE; 1060 } 1061 } 1062 break; 1063 1064 case R_MMIX_PUSHJ: 1065 { 1066 int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 1067 1068 /* Put a "PUSHGO $N,$255,0" after the common sequence. */ 1069 bfd_put_32 (abfd, 1070 ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1071 | (inreg << 16) 1072 | 0xff00, 1073 (bfd_byte *) datap + 16); 1074 1075 /* We change to an absolute value. */ 1076 value += addr; 1077 } 1078 break; 1079 1080 case R_MMIX_JMP: 1081 /* This one is a little special. If we get here on a non-relaxing 1082 link, and the destination is actually in range, we don't need to 1083 execute the nops. 1084 If so, we fall through to the bit-fiddling relocs. 1085 1086 FIXME: bfd_check_overflow seems broken; the relocation is 1087 rightshifted before testing, so supply a zero rightshift. */ 1088 1089 if (! ((value & 3) == 0 1090 && (r = bfd_check_overflow (complain_overflow_signed, 1091 howto->bitsize, 1092 0, 1093 bfd_arch_bits_per_address (abfd), 1094 value)) == bfd_reloc_ok)) 1095 { 1096 /* If the relocation doesn't fit in a JMP, we let the NOP:s be 1097 modified below, and put a "GO $255,$255,0" after the 1098 address-loading sequence. */ 1099 bfd_put_32 (abfd, 1100 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1101 | 0xffff00, 1102 (bfd_byte *) datap + 16); 1103 1104 /* We change to an absolute value. */ 1105 value += addr; 1106 break; 1107 } 1108 /* FALLTHROUGH. */ 1109 case R_MMIX_ADDR19: 1110 case R_MMIX_ADDR27: 1111 pcrel_mmix_reloc_fits: 1112 /* These must be in range, or else we emit an error. */ 1113 if ((value & 3) == 0 1114 /* Note rightshift 0; see above. */ 1115 && (r = bfd_check_overflow (complain_overflow_signed, 1116 howto->bitsize, 1117 0, 1118 bfd_arch_bits_per_address (abfd), 1119 value)) == bfd_reloc_ok) 1120 { 1121 bfd_vma in1 1122 = bfd_get_32 (abfd, (bfd_byte *) datap); 1123 bfd_vma highbit; 1124 1125 if ((bfd_signed_vma) value < 0) 1126 { 1127 highbit = 1 << 24; 1128 value += (1 << (howto->bitsize - 1)); 1129 } 1130 else 1131 highbit = 0; 1132 1133 value >>= 2; 1134 1135 bfd_put_32 (abfd, 1136 (in1 & howto->src_mask) 1137 | highbit 1138 | (value & howto->dst_mask), 1139 (bfd_byte *) datap); 1140 1141 return bfd_reloc_ok; 1142 } 1143 else 1144 return bfd_reloc_overflow; 1145 1146 case R_MMIX_BASE_PLUS_OFFSET: 1147 { 1148 struct bpo_reloc_section_info *bpodata 1149 = mmix_elf_section_data (isec)->bpo.reloc; 1150 asection *bpo_greg_section; 1151 struct bpo_greg_section_info *gregdata; 1152 size_t bpo_index; 1153 1154 if (bpodata == NULL) 1155 { 1156 /* This shouldn't happen when linking to ELF or mmo, so 1157 this is an attempt to link to "binary", right? We 1158 can't access the output bfd, so we can't verify that 1159 assumption. We only know that the critical 1160 mmix_elf_check_common_relocs has not been called, which 1161 happens when the output format is different from the 1162 input format (and is not mmo). */ 1163 if (! mmix_elf_section_data (isec)->has_warned_bpo) 1164 { 1165 /* For the first such error per input section, produce 1166 a verbose message. */ 1167 *error_message 1168 = _("invalid input relocation when producing" 1169 " non-ELF, non-mmo format output." 1170 "\n Please use the objcopy program to convert from" 1171 " ELF or mmo," 1172 "\n or compile using the gcc-option" 1173 " \"-mno-base-addresses\"."); 1174 mmix_elf_section_data (isec)->has_warned_bpo = TRUE; 1175 return bfd_reloc_dangerous; 1176 } 1177 1178 /* For subsequent errors, return this one, which is 1179 rate-limited but looks a little bit different, 1180 hopefully without affecting user-friendliness. */ 1181 return bfd_reloc_overflow; 1182 } 1183 1184 bpo_greg_section = bpodata->bpo_greg_section; 1185 gregdata = mmix_elf_section_data (bpo_greg_section)->bpo.greg; 1186 bpo_index = gregdata->bpo_reloc_indexes[bpodata->bpo_index++]; 1187 1188 /* A consistency check: The value we now have in "relocation" must 1189 be the same as the value we stored for that relocation. It 1190 doesn't cost much, so can be left in at all times. */ 1191 if (value != gregdata->reloc_request[bpo_index].value) 1192 { 1193 _bfd_error_handler 1194 /* xgettext:c-format */ 1195 (_("%B: Internal inconsistency error for value for\n\ 1196 linker-allocated global register: linked: %#Lx != relaxed: %#Lx"), 1197 isec->owner, 1198 value, 1199 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 void 1254 mmix_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, 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 (_("%B: invalid MMIX reloc number: %d"), abfd, r_type); 1265 r_type = 0; 1266 } 1267 cache_ptr->howto = &elf_mmix_howto_table[r_type]; 1268 } 1269 1270 /* Any MMIX-specific relocation gets here at assembly time or when linking 1271 to other formats (such as mmo); this is the relocation function from 1272 the reloc_table. We don't get here for final pure ELF linking. */ 1273 1274 static bfd_reloc_status_type 1275 mmix_elf_reloc (bfd *abfd, 1276 arelent *reloc_entry, 1277 asymbol *symbol, 1278 void * data, 1279 asection *input_section, 1280 bfd *output_bfd, 1281 char **error_message) 1282 { 1283 bfd_vma relocation; 1284 bfd_reloc_status_type r; 1285 asection *reloc_target_output_section; 1286 bfd_reloc_status_type flag = bfd_reloc_ok; 1287 bfd_vma output_base = 0; 1288 1289 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 1290 input_section, output_bfd, error_message); 1291 1292 /* If that was all that was needed (i.e. this isn't a final link, only 1293 some segment adjustments), we're done. */ 1294 if (r != bfd_reloc_continue) 1295 return r; 1296 1297 if (bfd_is_und_section (symbol->section) 1298 && (symbol->flags & BSF_WEAK) == 0 1299 && output_bfd == (bfd *) NULL) 1300 return bfd_reloc_undefined; 1301 1302 /* Is the address of the relocation really within the section? */ 1303 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 1304 return bfd_reloc_outofrange; 1305 1306 /* Work out which section the relocation is targeted at and the 1307 initial relocation command value. */ 1308 1309 /* Get symbol value. (Common symbols are special.) */ 1310 if (bfd_is_com_section (symbol->section)) 1311 relocation = 0; 1312 else 1313 relocation = symbol->value; 1314 1315 reloc_target_output_section = bfd_get_output_section (symbol); 1316 1317 /* Here the variable relocation holds the final address of the symbol we 1318 are relocating against, plus any addend. */ 1319 if (output_bfd) 1320 output_base = 0; 1321 else 1322 output_base = reloc_target_output_section->vma; 1323 1324 relocation += output_base + symbol->section->output_offset; 1325 1326 if (output_bfd != (bfd *) NULL) 1327 { 1328 /* Add in supplied addend. */ 1329 relocation += reloc_entry->addend; 1330 1331 /* This is a partial relocation, and we want to apply the 1332 relocation to the reloc entry rather than the raw data. 1333 Modify the reloc inplace to reflect what we now know. */ 1334 reloc_entry->addend = relocation; 1335 reloc_entry->address += input_section->output_offset; 1336 return flag; 1337 } 1338 1339 return mmix_final_link_relocate (reloc_entry->howto, input_section, 1340 data, reloc_entry->address, 1341 reloc_entry->addend, relocation, 1342 bfd_asymbol_name (symbol), 1343 reloc_target_output_section, 1344 error_message); 1345 } 1346 1347 /* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it 1349 for guidance if you're thinking of copying this. */ 1350 1351 static bfd_boolean 1352 mmix_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, 1353 struct bfd_link_info *info, 1354 bfd *input_bfd, 1355 asection *input_section, 1356 bfd_byte *contents, 1357 Elf_Internal_Rela *relocs, 1358 Elf_Internal_Sym *local_syms, 1359 asection **local_sections) 1360 { 1361 Elf_Internal_Shdr *symtab_hdr; 1362 struct elf_link_hash_entry **sym_hashes; 1363 Elf_Internal_Rela *rel; 1364 Elf_Internal_Rela *relend; 1365 bfd_size_type size; 1366 size_t pjsno = 0; 1367 1368 size = input_section->rawsize ? input_section->rawsize : input_section->size; 1369 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1370 sym_hashes = elf_sym_hashes (input_bfd); 1371 relend = relocs + input_section->reloc_count; 1372 1373 /* Zero the stub area before we start. */ 1374 if (input_section->rawsize != 0 1375 && input_section->size > input_section->rawsize) 1376 memset (contents + input_section->rawsize, 0, 1377 input_section->size - input_section->rawsize); 1378 1379 for (rel = relocs; rel < relend; rel ++) 1380 { 1381 reloc_howto_type *howto; 1382 unsigned long r_symndx; 1383 Elf_Internal_Sym *sym; 1384 asection *sec; 1385 struct elf_link_hash_entry *h; 1386 bfd_vma relocation; 1387 bfd_reloc_status_type r; 1388 const char *name = NULL; 1389 int r_type; 1390 bfd_boolean undefined_signalled = FALSE; 1391 1392 r_type = ELF64_R_TYPE (rel->r_info); 1393 1394 if (r_type == R_MMIX_GNU_VTINHERIT 1395 || r_type == R_MMIX_GNU_VTENTRY) 1396 continue; 1397 1398 r_symndx = ELF64_R_SYM (rel->r_info); 1399 1400 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info); 1401 h = NULL; 1402 sym = NULL; 1403 sec = NULL; 1404 1405 if (r_symndx < symtab_hdr->sh_info) 1406 { 1407 sym = local_syms + r_symndx; 1408 sec = local_sections [r_symndx]; 1409 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1410 1411 name = bfd_elf_string_from_elf_section (input_bfd, 1412 symtab_hdr->sh_link, 1413 sym->st_name); 1414 if (name == NULL) 1415 name = bfd_section_name (input_bfd, sec); 1416 } 1417 else 1418 { 1419 bfd_boolean unresolved_reloc, ignored; 1420 1421 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1422 r_symndx, symtab_hdr, sym_hashes, 1423 h, sec, relocation, 1424 unresolved_reloc, undefined_signalled, 1425 ignored); 1426 name = h->root.root.string; 1427 } 1428 1429 if (sec != NULL && discarded_section (sec)) 1430 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1431 rel, 1, relend, howto, 0, contents); 1432 1433 if (bfd_link_relocatable (info)) 1434 { 1435 /* This is a relocatable link. For most relocs we don't have to 1436 change anything, unless the reloc is against a section 1437 symbol, in which case we have to adjust according to where 1438 the section symbol winds up in the output section. */ 1439 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 1440 rel->r_addend += sec->output_offset; 1441 1442 /* For PUSHJ stub relocs however, we may need to change the 1443 reloc and the section contents, if the reloc doesn't reach 1444 beyond the end of the output section and previous stubs. 1445 Then we change the section contents to be a PUSHJ to the end 1446 of the input section plus stubs (we can do that without using 1447 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ 1448 at the stub location. */ 1449 if (r_type == R_MMIX_PUSHJ_STUBBABLE) 1450 { 1451 /* We've already checked whether we need a stub; use that 1452 knowledge. */ 1453 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno] 1454 != 0) 1455 { 1456 Elf_Internal_Rela relcpy; 1457 1458 if (mmix_elf_section_data (input_section) 1459 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE) 1460 abort (); 1461 1462 /* There's already a PUSHJ insn there, so just fill in 1463 the offset bits to the stub. */ 1464 if (mmix_final_link_relocate (elf_mmix_howto_table 1465 + R_MMIX_ADDR19, 1466 input_section, 1467 contents, 1468 rel->r_offset, 1469 0, 1470 input_section 1471 ->output_section->vma 1472 + input_section->output_offset 1473 + size 1474 + mmix_elf_section_data (input_section) 1475 ->pjs.stub_offset, 1476 NULL, NULL, NULL) != bfd_reloc_ok) 1477 return FALSE; 1478 1479 /* Put a JMP insn at the stub; it goes with the 1480 R_MMIX_JMP reloc. */ 1481 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24, 1482 contents 1483 + size 1484 + mmix_elf_section_data (input_section) 1485 ->pjs.stub_offset); 1486 1487 /* Change the reloc to be at the stub, and to a full 1488 R_MMIX_JMP reloc. */ 1489 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP); 1490 rel->r_offset 1491 = (size 1492 + mmix_elf_section_data (input_section) 1493 ->pjs.stub_offset); 1494 1495 mmix_elf_section_data (input_section)->pjs.stub_offset 1496 += MAX_PUSHJ_STUB_SIZE; 1497 1498 /* Shift this reloc to the end of the relocs to maintain 1499 the r_offset sorted reloc order. */ 1500 relcpy = *rel; 1501 memmove (rel, rel + 1, (char *) relend - (char *) rel); 1502 relend[-1] = relcpy; 1503 1504 /* Back up one reloc, or else we'd skip the next reloc 1505 in turn. */ 1506 rel--; 1507 } 1508 1509 pjsno++; 1510 } 1511 continue; 1512 } 1513 1514 r = mmix_final_link_relocate (howto, input_section, 1515 contents, rel->r_offset, 1516 rel->r_addend, relocation, name, sec, NULL); 1517 1518 if (r != bfd_reloc_ok) 1519 { 1520 const char * msg = (const char *) NULL; 1521 1522 switch (r) 1523 { 1524 case bfd_reloc_overflow: 1525 info->callbacks->reloc_overflow 1526 (info, (h ? &h->root : NULL), name, howto->name, 1527 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1528 break; 1529 1530 case bfd_reloc_undefined: 1531 /* We may have sent this message above. */ 1532 if (! undefined_signalled) 1533 info->callbacks->undefined_symbol 1534 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 1535 undefined_signalled = TRUE; 1536 break; 1537 1538 case bfd_reloc_outofrange: 1539 msg = _("internal error: out of range error"); 1540 break; 1541 1542 case bfd_reloc_notsupported: 1543 msg = _("internal error: unsupported relocation error"); 1544 break; 1545 1546 case bfd_reloc_dangerous: 1547 msg = _("internal error: dangerous relocation"); 1548 break; 1549 1550 default: 1551 msg = _("internal error: unknown error"); 1552 break; 1553 } 1554 1555 if (msg) 1556 (*info->callbacks->warning) (info, msg, name, input_bfd, 1557 input_section, rel->r_offset); 1558 } 1559 } 1560 1561 return TRUE; 1562 } 1563 1564 /* Perform a single relocation. By default we use the standard BFD 1566 routines. A few relocs we have to do ourselves. */ 1567 1568 static bfd_reloc_status_type 1569 mmix_final_link_relocate (reloc_howto_type *howto, asection *input_section, 1570 bfd_byte *contents, bfd_vma r_offset, 1571 bfd_signed_vma r_addend, bfd_vma relocation, 1572 const char *symname, asection *symsec, 1573 char **error_message) 1574 { 1575 bfd_reloc_status_type r = bfd_reloc_ok; 1576 bfd_vma addr 1577 = (input_section->output_section->vma 1578 + input_section->output_offset 1579 + r_offset); 1580 bfd_signed_vma srel 1581 = (bfd_signed_vma) relocation + r_addend; 1582 1583 switch (howto->type) 1584 { 1585 /* All these are PC-relative. */ 1586 case R_MMIX_PUSHJ_STUBBABLE: 1587 case R_MMIX_PUSHJ: 1588 case R_MMIX_CBRANCH: 1589 case R_MMIX_ADDR19: 1590 case R_MMIX_GETA: 1591 case R_MMIX_ADDR27: 1592 case R_MMIX_JMP: 1593 contents += r_offset; 1594 1595 srel -= (input_section->output_section->vma 1596 + input_section->output_offset 1597 + r_offset); 1598 1599 r = mmix_elf_perform_relocation (input_section, howto, contents, 1600 addr, srel, error_message); 1601 break; 1602 1603 case R_MMIX_BASE_PLUS_OFFSET: 1604 if (symsec == NULL) 1605 return bfd_reloc_undefined; 1606 1607 /* Check that we're not relocating against a register symbol. */ 1608 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1609 MMIX_REG_CONTENTS_SECTION_NAME) == 0 1610 || strcmp (bfd_get_section_name (symsec->owner, symsec), 1611 MMIX_REG_SECTION_NAME) == 0) 1612 { 1613 /* Note: This is separated out into two messages in order 1614 to ease the translation into other languages. */ 1615 if (symname == NULL || *symname == 0) 1616 _bfd_error_handler 1617 /* xgettext:c-format */ 1618 (_("%B: base-plus-offset relocation against register symbol:" 1619 " (unknown) in %A"), 1620 input_section->owner, symsec); 1621 else 1622 _bfd_error_handler 1623 /* xgettext:c-format */ 1624 (_("%B: base-plus-offset relocation against register symbol:" 1625 " %s in %A"), 1626 input_section->owner, symname, symsec); 1627 return bfd_reloc_overflow; 1628 } 1629 goto do_mmix_reloc; 1630 1631 case R_MMIX_REG_OR_BYTE: 1632 case R_MMIX_REG: 1633 /* For now, we handle these alike. They must refer to an register 1634 symbol, which is either relative to the register section and in 1635 the range 0..255, or is in the register contents section with vma 1636 regno * 8. */ 1637 1638 /* FIXME: A better way to check for reg contents section? 1639 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */ 1640 if (symsec == NULL) 1641 return bfd_reloc_undefined; 1642 1643 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1644 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1645 { 1646 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1647 { 1648 /* The bfd_reloc_outofrange return value, though intuitively 1649 a better value, will not get us an error. */ 1650 return bfd_reloc_overflow; 1651 } 1652 srel /= 8; 1653 } 1654 else if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1655 MMIX_REG_SECTION_NAME) == 0) 1656 { 1657 if (srel < 0 || srel > 255) 1658 /* The bfd_reloc_outofrange return value, though intuitively a 1659 better value, will not get us an error. */ 1660 return bfd_reloc_overflow; 1661 } 1662 else 1663 { 1664 /* Note: This is separated out into two messages in order 1665 to ease the translation into other languages. */ 1666 if (symname == NULL || *symname == 0) 1667 _bfd_error_handler 1668 /* xgettext:c-format */ 1669 (_("%B: register relocation against non-register symbol:" 1670 " (unknown) in %A"), 1671 input_section->owner, symsec); 1672 else 1673 _bfd_error_handler 1674 /* xgettext:c-format */ 1675 (_("%B: register relocation against non-register symbol:" 1676 " %s in %A"), 1677 input_section->owner, symname, symsec); 1678 1679 /* The bfd_reloc_outofrange return value, though intuitively a 1680 better value, will not get us an error. */ 1681 return bfd_reloc_overflow; 1682 } 1683 do_mmix_reloc: 1684 contents += r_offset; 1685 r = mmix_elf_perform_relocation (input_section, howto, contents, 1686 addr, srel, error_message); 1687 break; 1688 1689 case R_MMIX_LOCAL: 1690 /* This isn't a real relocation, it's just an assertion that the 1691 final relocation value corresponds to a local register. We 1692 ignore the actual relocation; nothing is changed. */ 1693 { 1694 asection *regsec 1695 = bfd_get_section_by_name (input_section->output_section->owner, 1696 MMIX_REG_CONTENTS_SECTION_NAME); 1697 bfd_vma first_global; 1698 1699 /* Check that this is an absolute value, or a reference to the 1700 register contents section or the register (symbol) section. 1701 Absolute numbers can get here as undefined section. Undefined 1702 symbols are signalled elsewhere, so there's no conflict in us 1703 accidentally handling it. */ 1704 if (!bfd_is_abs_section (symsec) 1705 && !bfd_is_und_section (symsec) 1706 && strcmp (bfd_get_section_name (symsec->owner, symsec), 1707 MMIX_REG_CONTENTS_SECTION_NAME) != 0 1708 && strcmp (bfd_get_section_name (symsec->owner, symsec), 1709 MMIX_REG_SECTION_NAME) != 0) 1710 { 1711 _bfd_error_handler 1712 (_("%B: directive LOCAL valid only with a register or absolute value"), 1713 input_section->owner); 1714 1715 return bfd_reloc_overflow; 1716 } 1717 1718 /* If we don't have a register contents section, then $255 is the 1719 first global register. */ 1720 if (regsec == NULL) 1721 first_global = 255; 1722 else 1723 { 1724 first_global 1725 = bfd_get_section_vma (input_section->output_section->owner, 1726 regsec) / 8; 1727 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1728 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1729 { 1730 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1731 /* The bfd_reloc_outofrange return value, though 1732 intuitively a better value, will not get us an error. */ 1733 return bfd_reloc_overflow; 1734 srel /= 8; 1735 } 1736 } 1737 1738 if ((bfd_vma) srel >= first_global) 1739 { 1740 /* FIXME: Better error message. */ 1741 _bfd_error_handler 1742 /* xgettext:c-format */ 1743 (_("%B: LOCAL directive: Register $%Ld is not a local register." 1744 " First global register is $%Ld."), 1745 input_section->owner, srel, first_global); 1746 1747 return bfd_reloc_overflow; 1748 } 1749 } 1750 r = bfd_reloc_ok; 1751 break; 1752 1753 default: 1754 r = _bfd_final_link_relocate (howto, input_section->owner, input_section, 1755 contents, r_offset, 1756 relocation, r_addend); 1757 } 1758 1759 return r; 1760 } 1761 1762 /* Return the section that should be marked against GC for a given 1764 relocation. */ 1765 1766 static asection * 1767 mmix_elf_gc_mark_hook (asection *sec, 1768 struct bfd_link_info *info, 1769 Elf_Internal_Rela *rel, 1770 struct elf_link_hash_entry *h, 1771 Elf_Internal_Sym *sym) 1772 { 1773 if (h != NULL) 1774 switch (ELF64_R_TYPE (rel->r_info)) 1775 { 1776 case R_MMIX_GNU_VTINHERIT: 1777 case R_MMIX_GNU_VTENTRY: 1778 return NULL; 1779 } 1780 1781 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1782 } 1783 1784 /* Sort register relocs to come before expanding relocs. */ 1786 1787 static int 1788 mmix_elf_sort_relocs (const void * p1, const void * p2) 1789 { 1790 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1; 1791 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2; 1792 int r1_is_reg, r2_is_reg; 1793 1794 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive 1795 insns. */ 1796 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3)) 1797 return 1; 1798 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3)) 1799 return -1; 1800 1801 r1_is_reg 1802 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE 1803 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG); 1804 r2_is_reg 1805 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE 1806 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG); 1807 if (r1_is_reg != r2_is_reg) 1808 return r2_is_reg - r1_is_reg; 1809 1810 /* Neither or both are register relocs. Then sort on full offset. */ 1811 if (r1->r_offset > r2->r_offset) 1812 return 1; 1813 else if (r1->r_offset < r2->r_offset) 1814 return -1; 1815 return 0; 1816 } 1817 1818 /* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */ 1819 1820 static bfd_boolean 1821 mmix_elf_check_common_relocs (bfd *abfd, 1822 struct bfd_link_info *info, 1823 asection *sec, 1824 const Elf_Internal_Rela *relocs) 1825 { 1826 bfd *bpo_greg_owner = NULL; 1827 asection *allocated_gregs_section = NULL; 1828 struct bpo_greg_section_info *gregdata = NULL; 1829 struct bpo_reloc_section_info *bpodata = NULL; 1830 const Elf_Internal_Rela *rel; 1831 const Elf_Internal_Rela *rel_end; 1832 1833 /* We currently have to abuse this COFF-specific member, since there's 1834 no target-machine-dedicated member. There's no alternative outside 1835 the bfd_link_info struct; we can't specialize a hash-table since 1836 they're different between ELF and mmo. */ 1837 bpo_greg_owner = (bfd *) info->base_file; 1838 1839 rel_end = relocs + sec->reloc_count; 1840 for (rel = relocs; rel < rel_end; rel++) 1841 { 1842 switch (ELF64_R_TYPE (rel->r_info)) 1843 { 1844 /* This relocation causes a GREG allocation. We need to count 1845 them, and we need to create a section for them, so we need an 1846 object to fake as the owner of that section. We can't use 1847 the ELF dynobj for this, since the ELF bits assume lots of 1848 DSO-related stuff if that member is non-NULL. */ 1849 case R_MMIX_BASE_PLUS_OFFSET: 1850 /* We don't do anything with this reloc for a relocatable link. */ 1851 if (bfd_link_relocatable (info)) 1852 break; 1853 1854 if (bpo_greg_owner == NULL) 1855 { 1856 bpo_greg_owner = abfd; 1857 info->base_file = bpo_greg_owner; 1858 } 1859 1860 if (allocated_gregs_section == NULL) 1861 allocated_gregs_section 1862 = bfd_get_section_by_name (bpo_greg_owner, 1863 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 1864 1865 if (allocated_gregs_section == NULL) 1866 { 1867 allocated_gregs_section 1868 = bfd_make_section_with_flags (bpo_greg_owner, 1869 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME, 1870 (SEC_HAS_CONTENTS 1871 | SEC_IN_MEMORY 1872 | SEC_LINKER_CREATED)); 1873 /* Setting both SEC_ALLOC and SEC_LOAD means the section is 1874 treated like any other section, and we'd get errors for 1875 address overlap with the text section. Let's set none of 1876 those flags, as that is what currently happens for usual 1877 GREG allocations, and that works. */ 1878 if (allocated_gregs_section == NULL 1879 || !bfd_set_section_alignment (bpo_greg_owner, 1880 allocated_gregs_section, 1881 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 BFD_ASSERT (h != NULL); 2008 if (h != NULL 2009 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2010 return FALSE; 2011 break; 2012 } 2013 } 2014 2015 return TRUE; 2016 } 2017 2018 /* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo. 2019 Copied from elf_link_add_object_symbols. */ 2020 2021 bfd_boolean 2022 _bfd_mmix_check_all_relocs (bfd *abfd, struct bfd_link_info *info) 2023 { 2024 asection *o; 2025 2026 for (o = abfd->sections; o != NULL; o = o->next) 2027 { 2028 Elf_Internal_Rela *internal_relocs; 2029 bfd_boolean ok; 2030 2031 if ((o->flags & SEC_RELOC) == 0 2032 || o->reloc_count == 0 2033 || ((info->strip == strip_all || info->strip == strip_debugger) 2034 && (o->flags & SEC_DEBUGGING) != 0) 2035 || bfd_is_abs_section (o->output_section)) 2036 continue; 2037 2038 internal_relocs 2039 = _bfd_elf_link_read_relocs (abfd, o, NULL, 2040 (Elf_Internal_Rela *) NULL, 2041 info->keep_memory); 2042 if (internal_relocs == NULL) 2043 return FALSE; 2044 2045 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs); 2046 2047 if (! info->keep_memory) 2048 free (internal_relocs); 2049 2050 if (! ok) 2051 return FALSE; 2052 } 2053 2054 return TRUE; 2055 } 2056 2057 /* Change symbols relative to the reg contents section to instead be to 2059 the register section, and scale them down to correspond to the register 2060 number. */ 2061 2062 static int 2063 mmix_elf_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED, 2064 const char *name ATTRIBUTE_UNUSED, 2065 Elf_Internal_Sym *sym, 2066 asection *input_sec, 2067 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) 2068 { 2069 if (input_sec != NULL 2070 && input_sec->name != NULL 2071 && ELF_ST_TYPE (sym->st_info) != STT_SECTION 2072 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0) 2073 { 2074 sym->st_value /= 8; 2075 sym->st_shndx = SHN_REGISTER; 2076 } 2077 2078 return 1; 2079 } 2080 2081 /* We fake a register section that holds values that are register numbers. 2082 Having a SHN_REGISTER and register section translates better to other 2083 formats (e.g. mmo) than for example a STT_REGISTER attribute. 2084 This section faking is based on a construct in elf32-mips.c. */ 2085 static asection mmix_elf_reg_section; 2086 static asymbol mmix_elf_reg_section_symbol; 2087 static asymbol *mmix_elf_reg_section_symbol_ptr; 2088 2089 /* Handle the special section numbers that a symbol may use. */ 2090 2091 void 2092 mmix_elf_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, asymbol *asym) 2093 { 2094 elf_symbol_type *elfsym; 2095 2096 elfsym = (elf_symbol_type *) asym; 2097 switch (elfsym->internal_elf_sym.st_shndx) 2098 { 2099 case SHN_REGISTER: 2100 if (mmix_elf_reg_section.name == NULL) 2101 { 2102 /* Initialize the register section. */ 2103 mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME; 2104 mmix_elf_reg_section.flags = SEC_NO_FLAGS; 2105 mmix_elf_reg_section.output_section = &mmix_elf_reg_section; 2106 mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol; 2107 mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr; 2108 mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME; 2109 mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM; 2110 mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section; 2111 mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol; 2112 } 2113 asym->section = &mmix_elf_reg_section; 2114 break; 2115 2116 default: 2117 break; 2118 } 2119 } 2120 2121 /* Given a BFD section, try to locate the corresponding ELF section 2122 index. */ 2123 2124 static bfd_boolean 2125 mmix_elf_section_from_bfd_section (bfd * abfd ATTRIBUTE_UNUSED, 2126 asection * sec, 2127 int * retval) 2128 { 2129 if (strcmp (bfd_get_section_name (abfd, sec), MMIX_REG_SECTION_NAME) == 0) 2130 *retval = SHN_REGISTER; 2131 else 2132 return FALSE; 2133 2134 return TRUE; 2135 } 2136 2137 /* Hook called by the linker routine which adds symbols from an object 2138 file. We must handle the special SHN_REGISTER section number here. 2139 2140 We also check that we only have *one* each of the section-start 2141 symbols, since otherwise having two with the same value would cause 2142 them to be "merged", but with the contents serialized. */ 2143 2144 static bfd_boolean 2145 mmix_elf_add_symbol_hook (bfd *abfd, 2146 struct bfd_link_info *info ATTRIBUTE_UNUSED, 2147 Elf_Internal_Sym *sym, 2148 const char **namep ATTRIBUTE_UNUSED, 2149 flagword *flagsp ATTRIBUTE_UNUSED, 2150 asection **secp, 2151 bfd_vma *valp ATTRIBUTE_UNUSED) 2152 { 2153 if (sym->st_shndx == SHN_REGISTER) 2154 { 2155 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME); 2156 (*secp)->flags |= SEC_LINKER_CREATED; 2157 } 2158 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.' 2159 && CONST_STRNEQ (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) 2160 { 2161 /* See if we have another one. */ 2162 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash, 2163 *namep, 2164 FALSE, 2165 FALSE, 2166 FALSE); 2167 2168 if (h != NULL && h->type != bfd_link_hash_undefined) 2169 { 2170 /* How do we get the asymbol (or really: the filename) from h? 2171 h->u.def.section->owner is NULL. */ 2172 _bfd_error_handler 2173 /* xgettext:c-format */ 2174 (_("%B: Error: multiple definition of `%s'; start of %s " 2175 "is set in a earlier linked file\n"), 2176 abfd, *namep, 2177 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX)); 2178 bfd_set_error (bfd_error_bad_value); 2179 return FALSE; 2180 } 2181 } 2182 2183 return TRUE; 2184 } 2185 2186 /* We consider symbols matching "L.*:[0-9]+" to be local symbols. */ 2187 2188 static bfd_boolean 2189 mmix_elf_is_local_label_name (bfd *abfd, const char *name) 2190 { 2191 const char *colpos; 2192 int digits; 2193 2194 /* Also include the default local-label definition. */ 2195 if (_bfd_elf_is_local_label_name (abfd, name)) 2196 return TRUE; 2197 2198 if (*name != 'L') 2199 return FALSE; 2200 2201 /* If there's no ":", or more than one, it's not a local symbol. */ 2202 colpos = strchr (name, ':'); 2203 if (colpos == NULL || strchr (colpos + 1, ':') != NULL) 2204 return FALSE; 2205 2206 /* Check that there are remaining characters and that they are digits. */ 2207 if (colpos[1] == 0) 2208 return FALSE; 2209 2210 digits = strspn (colpos + 1, "0123456789"); 2211 return digits != 0 && colpos[1 + digits] == 0; 2212 } 2213 2214 /* We get rid of the register section here. */ 2215 2216 bfd_boolean 2217 mmix_elf_final_link (bfd *abfd, struct bfd_link_info *info) 2218 { 2219 /* We never output a register section, though we create one for 2220 temporary measures. Check that nobody entered contents into it. */ 2221 asection *reg_section; 2222 2223 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME); 2224 2225 if (reg_section != NULL) 2226 { 2227 /* FIXME: Pass error state gracefully. */ 2228 if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS) 2229 _bfd_abort (__FILE__, __LINE__, _("Register section has contents\n")); 2230 2231 /* Really remove the section, if it hasn't already been done. */ 2232 if (!bfd_section_removed_from_list (abfd, reg_section)) 2233 { 2234 bfd_section_list_remove (abfd, reg_section); 2235 --abfd->section_count; 2236 } 2237 } 2238 2239 if (! bfd_elf_final_link (abfd, info)) 2240 return FALSE; 2241 2242 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by 2243 the regular linker machinery. We do it here, like other targets with 2244 special sections. */ 2245 if (info->base_file != NULL) 2246 { 2247 asection *greg_section 2248 = bfd_get_section_by_name ((bfd *) info->base_file, 2249 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2250 if (!bfd_set_section_contents (abfd, 2251 greg_section->output_section, 2252 greg_section->contents, 2253 (file_ptr) greg_section->output_offset, 2254 greg_section->size)) 2255 return FALSE; 2256 } 2257 return TRUE; 2258 } 2259 2260 /* We need to include the maximum size of PUSHJ-stubs in the initial 2261 section size. This is expected to shrink during linker relaxation. */ 2262 2263 static void 2264 mmix_set_relaxable_size (bfd *abfd ATTRIBUTE_UNUSED, 2265 asection *sec, 2266 void *ptr) 2267 { 2268 struct bfd_link_info *info = ptr; 2269 2270 /* Make sure we only do this for section where we know we want this, 2271 otherwise we might end up resetting the size of COMMONs. */ 2272 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0) 2273 return; 2274 2275 sec->rawsize = sec->size; 2276 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2277 * MAX_PUSHJ_STUB_SIZE); 2278 2279 /* For use in relocatable link, we start with a max stubs size. See 2280 mmix_elf_relax_section. */ 2281 if (bfd_link_relocatable (info) && sec->output_section) 2282 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum 2283 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2284 * MAX_PUSHJ_STUB_SIZE); 2285 } 2286 2287 /* Initialize stuff for the linker-generated GREGs to match 2288 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */ 2289 2290 bfd_boolean 2291 _bfd_mmix_before_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2292 struct bfd_link_info *info) 2293 { 2294 asection *bpo_gregs_section; 2295 bfd *bpo_greg_owner; 2296 struct bpo_greg_section_info *gregdata; 2297 size_t n_gregs; 2298 bfd_vma gregs_size; 2299 size_t i; 2300 size_t *bpo_reloc_indexes; 2301 bfd *ibfd; 2302 2303 /* Set the initial size of sections. */ 2304 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 2305 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info); 2306 2307 /* The bpo_greg_owner bfd is supposed to have been set by 2308 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen. 2309 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2310 bpo_greg_owner = (bfd *) info->base_file; 2311 if (bpo_greg_owner == NULL) 2312 return TRUE; 2313 2314 bpo_gregs_section 2315 = bfd_get_section_by_name (bpo_greg_owner, 2316 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2317 2318 if (bpo_gregs_section == NULL) 2319 return TRUE; 2320 2321 /* We use the target-data handle in the ELF section data. */ 2322 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2323 if (gregdata == NULL) 2324 return FALSE; 2325 2326 n_gregs = gregdata->n_bpo_relocs; 2327 gregdata->n_allocated_bpo_gregs = n_gregs; 2328 2329 /* When this reaches zero during relaxation, all entries have been 2330 filled in and the size of the linker gregs can be calculated. */ 2331 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs; 2332 2333 /* Set the zeroth-order estimate for the GREGs size. */ 2334 gregs_size = n_gregs * 8; 2335 2336 if (!bfd_set_section_size (bpo_greg_owner, bpo_gregs_section, gregs_size)) 2337 return FALSE; 2338 2339 /* Allocate and set up the GREG arrays. They're filled in at relaxation 2340 time. Note that we must use the max number ever noted for the array, 2341 since the index numbers were created before GC. */ 2342 gregdata->reloc_request 2343 = bfd_zalloc (bpo_greg_owner, 2344 sizeof (struct bpo_reloc_request) 2345 * gregdata->n_max_bpo_relocs); 2346 2347 gregdata->bpo_reloc_indexes 2348 = bpo_reloc_indexes 2349 = bfd_alloc (bpo_greg_owner, 2350 gregdata->n_max_bpo_relocs 2351 * sizeof (size_t)); 2352 if (bpo_reloc_indexes == NULL) 2353 return FALSE; 2354 2355 /* The default order is an identity mapping. */ 2356 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2357 { 2358 bpo_reloc_indexes[i] = i; 2359 gregdata->reloc_request[i].bpo_reloc_no = i; 2360 } 2361 2362 return TRUE; 2363 } 2364 2365 /* Fill in contents in the linker allocated gregs. Everything is 2367 calculated at this point; we just move the contents into place here. */ 2368 2369 bfd_boolean 2370 _bfd_mmix_after_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2371 struct bfd_link_info *link_info) 2372 { 2373 asection *bpo_gregs_section; 2374 bfd *bpo_greg_owner; 2375 struct bpo_greg_section_info *gregdata; 2376 size_t n_gregs; 2377 size_t i, j; 2378 size_t lastreg; 2379 bfd_byte *contents; 2380 2381 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs 2382 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such 2383 object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2384 bpo_greg_owner = (bfd *) link_info->base_file; 2385 if (bpo_greg_owner == NULL) 2386 return TRUE; 2387 2388 bpo_gregs_section 2389 = bfd_get_section_by_name (bpo_greg_owner, 2390 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2391 2392 /* This can't happen without DSO handling. When DSOs are handled 2393 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such 2394 section. */ 2395 if (bpo_gregs_section == NULL) 2396 return TRUE; 2397 2398 /* We use the target-data handle in the ELF section data. */ 2399 2400 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2401 if (gregdata == NULL) 2402 return FALSE; 2403 2404 n_gregs = gregdata->n_allocated_bpo_gregs; 2405 2406 bpo_gregs_section->contents 2407 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size); 2408 if (contents == NULL) 2409 return FALSE; 2410 2411 /* Sanity check: If these numbers mismatch, some relocation has not been 2412 accounted for and the rest of gregdata is probably inconsistent. 2413 It's a bug, but it's more helpful to identify it than segfaulting 2414 below. */ 2415 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round 2416 != gregdata->n_bpo_relocs) 2417 { 2418 _bfd_error_handler 2419 /* xgettext:c-format */ 2420 (_("Internal inconsistency: remaining %lu != max %lu.\n\ 2421 Please report this bug."), 2422 (unsigned long) gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2423 (unsigned long) gregdata->n_bpo_relocs); 2424 return FALSE; 2425 } 2426 2427 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++) 2428 if (gregdata->reloc_request[i].regindex != lastreg) 2429 { 2430 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value, 2431 contents + j * 8); 2432 lastreg = gregdata->reloc_request[i].regindex; 2433 j++; 2434 } 2435 2436 return TRUE; 2437 } 2438 2439 /* Sort valid relocs to come before non-valid relocs, then on increasing 2440 value. */ 2441 2442 static int 2443 bpo_reloc_request_sort_fn (const void * p1, const void * p2) 2444 { 2445 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1; 2446 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2; 2447 2448 /* Primary function is validity; non-valid relocs sorted after valid 2449 ones. */ 2450 if (r1->valid != r2->valid) 2451 return r2->valid - r1->valid; 2452 2453 /* Then sort on value. Don't simplify and return just the difference of 2454 the values: the upper bits of the 64-bit value would be truncated on 2455 a host with 32-bit ints. */ 2456 if (r1->value != r2->value) 2457 return r1->value > r2->value ? 1 : -1; 2458 2459 /* As a last re-sort, use the relocation number, so we get a stable 2460 sort. The *addresses* aren't stable since items are swapped during 2461 sorting. It depends on the qsort implementation if this actually 2462 happens. */ 2463 return r1->bpo_reloc_no > r2->bpo_reloc_no 2464 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0); 2465 } 2466 2467 /* For debug use only. Dumps the global register allocations resulting 2468 from base-plus-offset relocs. */ 2469 2470 void 2471 mmix_dump_bpo_gregs (struct bfd_link_info *link_info, 2472 void (*pf) (const char *fmt, ...)) 2473 { 2474 bfd *bpo_greg_owner; 2475 asection *bpo_gregs_section; 2476 struct bpo_greg_section_info *gregdata; 2477 unsigned int i; 2478 2479 if (link_info == NULL || link_info->base_file == NULL) 2480 return; 2481 2482 bpo_greg_owner = (bfd *) link_info->base_file; 2483 2484 bpo_gregs_section 2485 = bfd_get_section_by_name (bpo_greg_owner, 2486 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2487 2488 if (bpo_gregs_section == NULL) 2489 return; 2490 2491 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2492 if (gregdata == NULL) 2493 return; 2494 2495 if (pf == NULL) 2496 pf = _bfd_error_handler; 2497 2498 /* These format strings are not translated. They are for debug purposes 2499 only and never displayed to an end user. Should they escape, we 2500 surely want them in original. */ 2501 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\ 2502 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs, 2503 gregdata->n_max_bpo_relocs, 2504 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2505 gregdata->n_allocated_bpo_gregs); 2506 2507 if (gregdata->reloc_request) 2508 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2509 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n", 2510 i, 2511 (gregdata->bpo_reloc_indexes != NULL 2512 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1), 2513 gregdata->reloc_request[i].bpo_reloc_no, 2514 gregdata->reloc_request[i].valid, 2515 2516 (unsigned long) (gregdata->reloc_request[i].value >> 32), 2517 (unsigned long) gregdata->reloc_request[i].value, 2518 gregdata->reloc_request[i].regindex, 2519 gregdata->reloc_request[i].offset); 2520 } 2521 2522 /* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and 2523 when the last such reloc is done, an index-array is sorted according to 2524 the values and iterated over to produce register numbers (indexed by 0 2525 from the first allocated register number) and offsets for use in real 2526 relocation. (N.B.: Relocatable runs are handled, not just punted.) 2527 2528 PUSHJ stub accounting is also done here. 2529 2530 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 2531 2532 static bfd_boolean 2533 mmix_elf_relax_section (bfd *abfd, 2534 asection *sec, 2535 struct bfd_link_info *link_info, 2536 bfd_boolean *again) 2537 { 2538 Elf_Internal_Shdr *symtab_hdr; 2539 Elf_Internal_Rela *internal_relocs; 2540 Elf_Internal_Rela *irel, *irelend; 2541 asection *bpo_gregs_section = NULL; 2542 struct bpo_greg_section_info *gregdata; 2543 struct bpo_reloc_section_info *bpodata 2544 = mmix_elf_section_data (sec)->bpo.reloc; 2545 /* The initialization is to quiet compiler warnings. The value is to 2546 spot a missing actual initialization. */ 2547 size_t bpono = (size_t) -1; 2548 size_t pjsno = 0; 2549 Elf_Internal_Sym *isymbuf = NULL; 2550 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size; 2551 2552 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0; 2553 2554 /* Assume nothing changes. */ 2555 *again = FALSE; 2556 2557 /* We don't have to do anything if this section does not have relocs, or 2558 if this is not a code section. */ 2559 if ((sec->flags & SEC_RELOC) == 0 2560 || sec->reloc_count == 0 2561 || (sec->flags & SEC_CODE) == 0 2562 || (sec->flags & SEC_LINKER_CREATED) != 0 2563 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs, 2564 then nothing to do. */ 2565 || (bpodata == NULL 2566 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)) 2567 return TRUE; 2568 2569 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2570 2571 if (bpodata != NULL) 2572 { 2573 bpo_gregs_section = bpodata->bpo_greg_section; 2574 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2575 bpono = bpodata->first_base_plus_offset_reloc; 2576 } 2577 else 2578 gregdata = NULL; 2579 2580 /* Get a copy of the native relocations. */ 2581 internal_relocs 2582 = _bfd_elf_link_read_relocs (abfd, sec, NULL, 2583 (Elf_Internal_Rela *) NULL, 2584 link_info->keep_memory); 2585 if (internal_relocs == NULL) 2586 goto error_return; 2587 2588 /* Walk through them looking for relaxing opportunities. */ 2589 irelend = internal_relocs + sec->reloc_count; 2590 for (irel = internal_relocs; irel < irelend; irel++) 2591 { 2592 bfd_vma symval; 2593 struct elf_link_hash_entry *h = NULL; 2594 2595 /* We only process two relocs. */ 2596 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET 2597 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE) 2598 continue; 2599 2600 /* We process relocs in a distinctly different way when this is a 2601 relocatable link (for one, we don't look at symbols), so we avoid 2602 mixing its code with that for the "normal" relaxation. */ 2603 if (bfd_link_relocatable (link_info)) 2604 { 2605 /* The only transformation in a relocatable link is to generate 2606 a full stub at the location of the stub calculated for the 2607 input section, if the relocated stub location, the end of the 2608 output section plus earlier stubs, cannot be reached. Thus 2609 relocatable linking can only lead to worse code, but it still 2610 works. */ 2611 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE) 2612 { 2613 /* If we can reach the end of the output-section and beyond 2614 any current stubs, then we don't need a stub for this 2615 reloc. The relaxed order of output stub allocation may 2616 not exactly match the straightforward order, so we always 2617 assume presence of output stubs, which will allow 2618 relaxation only on relocations indifferent to the 2619 presence of output stub allocations for other relocations 2620 and thus the order of output stub allocation. */ 2621 if (bfd_check_overflow (complain_overflow_signed, 2622 19, 2623 0, 2624 bfd_arch_bits_per_address (abfd), 2625 /* Output-stub location. */ 2626 sec->output_section->rawsize 2627 + (mmix_elf_section_data (sec 2628 ->output_section) 2629 ->pjs.stubs_size_sum) 2630 /* Location of this PUSHJ reloc. */ 2631 - (sec->output_offset + irel->r_offset) 2632 /* Don't count *this* stub twice. */ 2633 - (mmix_elf_section_data (sec) 2634 ->pjs.stub_size[pjsno] 2635 + MAX_PUSHJ_STUB_SIZE)) 2636 == bfd_reloc_ok) 2637 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2638 2639 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2640 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2641 2642 pjsno++; 2643 } 2644 2645 continue; 2646 } 2647 2648 /* Get the value of the symbol referred to by the reloc. */ 2649 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2650 { 2651 /* A local symbol. */ 2652 Elf_Internal_Sym *isym; 2653 asection *sym_sec; 2654 2655 /* Read this BFD's local symbols if we haven't already. */ 2656 if (isymbuf == NULL) 2657 { 2658 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2659 if (isymbuf == NULL) 2660 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2661 symtab_hdr->sh_info, 0, 2662 NULL, NULL, NULL); 2663 if (isymbuf == 0) 2664 goto error_return; 2665 } 2666 2667 isym = isymbuf + ELF64_R_SYM (irel->r_info); 2668 if (isym->st_shndx == SHN_UNDEF) 2669 sym_sec = bfd_und_section_ptr; 2670 else if (isym->st_shndx == SHN_ABS) 2671 sym_sec = bfd_abs_section_ptr; 2672 else if (isym->st_shndx == SHN_COMMON) 2673 sym_sec = bfd_com_section_ptr; 2674 else 2675 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2676 symval = (isym->st_value 2677 + sym_sec->output_section->vma 2678 + sym_sec->output_offset); 2679 } 2680 else 2681 { 2682 unsigned long indx; 2683 2684 /* An external symbol. */ 2685 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2686 h = elf_sym_hashes (abfd)[indx]; 2687 BFD_ASSERT (h != NULL); 2688 if (h->root.type == bfd_link_hash_undefweak) 2689 /* FIXME: for R_MMIX_PUSHJ_STUBBABLE, there are alternatives to 2690 the canonical value 0 for an unresolved weak symbol to 2691 consider: as the debug-friendly approach, resolve to "abort" 2692 (or a port-specific function), or as the space-friendly 2693 approach resolve to the next instruction (like some other 2694 ports, notably ARM and AArch64). These alternatives require 2695 matching code in mmix_elf_perform_relocation or its caller. */ 2696 symval = 0; 2697 else if (h->root.type == bfd_link_hash_defined 2698 || h->root.type == bfd_link_hash_defweak) 2699 symval = (h->root.u.def.value 2700 + h->root.u.def.section->output_section->vma 2701 + h->root.u.def.section->output_offset); 2702 else 2703 { 2704 /* This appears to be a reference to an undefined symbol. Just 2705 ignore it--it will be caught by the regular reloc processing. 2706 We need to keep BPO reloc accounting consistent, though 2707 else we'll abort instead of emitting an error message. */ 2708 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET 2709 && gregdata != NULL) 2710 { 2711 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2712 bpono++; 2713 } 2714 continue; 2715 } 2716 } 2717 2718 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE) 2719 { 2720 bfd_vma value = symval + irel->r_addend; 2721 bfd_vma dot 2722 = (sec->output_section->vma 2723 + sec->output_offset 2724 + irel->r_offset); 2725 bfd_vma stubaddr 2726 = (sec->output_section->vma 2727 + sec->output_offset 2728 + size 2729 + mmix_elf_section_data (sec)->pjs.stubs_size_sum); 2730 2731 if ((value & 3) == 0 2732 && bfd_check_overflow (complain_overflow_signed, 2733 19, 2734 0, 2735 bfd_arch_bits_per_address (abfd), 2736 value - dot 2737 - (value > dot 2738 ? mmix_elf_section_data (sec) 2739 ->pjs.stub_size[pjsno] 2740 : 0)) 2741 == bfd_reloc_ok) 2742 /* If the reloc fits, no stub is needed. */ 2743 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2744 else 2745 /* Maybe we can get away with just a JMP insn? */ 2746 if ((value & 3) == 0 2747 && bfd_check_overflow (complain_overflow_signed, 2748 27, 2749 0, 2750 bfd_arch_bits_per_address (abfd), 2751 value - stubaddr 2752 - (value > dot 2753 ? mmix_elf_section_data (sec) 2754 ->pjs.stub_size[pjsno] - 4 2755 : 0)) 2756 == bfd_reloc_ok) 2757 /* Yep, account for a stub consisting of a single JMP insn. */ 2758 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4; 2759 else 2760 /* Nope, go for the full insn stub. It doesn't seem useful to 2761 emit the intermediate sizes; those will only be useful for 2762 a >64M program assuming contiguous code. */ 2763 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] 2764 = MAX_PUSHJ_STUB_SIZE; 2765 2766 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2767 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2768 pjsno++; 2769 continue; 2770 } 2771 2772 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */ 2773 2774 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value 2775 = symval + irel->r_addend; 2776 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE; 2777 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2778 } 2779 2780 /* Check if that was the last BPO-reloc. If so, sort the values and 2781 calculate how many registers we need to cover them. Set the size of 2782 the linker gregs, and if the number of registers changed, indicate 2783 that we need to relax some more because we have more work to do. */ 2784 if (gregdata != NULL 2785 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0) 2786 { 2787 size_t i; 2788 bfd_vma prev_base; 2789 size_t regindex; 2790 2791 /* First, reset the remaining relocs for the next round. */ 2792 gregdata->n_remaining_bpo_relocs_this_relaxation_round 2793 = gregdata->n_bpo_relocs; 2794 2795 qsort (gregdata->reloc_request, 2796 gregdata->n_max_bpo_relocs, 2797 sizeof (struct bpo_reloc_request), 2798 bpo_reloc_request_sort_fn); 2799 2800 /* Recalculate indexes. When we find a change (however unlikely 2801 after the initial iteration), we know we need to relax again, 2802 since items in the GREG-array are sorted by increasing value and 2803 stored in the relaxation phase. */ 2804 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2805 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2806 != i) 2807 { 2808 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2809 = i; 2810 *again = TRUE; 2811 } 2812 2813 /* Allocate register numbers (indexing from 0). Stop at the first 2814 non-valid reloc. */ 2815 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value; 2816 i < gregdata->n_bpo_relocs; 2817 i++) 2818 { 2819 if (gregdata->reloc_request[i].value > prev_base + 255) 2820 { 2821 regindex++; 2822 prev_base = gregdata->reloc_request[i].value; 2823 } 2824 gregdata->reloc_request[i].regindex = regindex; 2825 gregdata->reloc_request[i].offset 2826 = gregdata->reloc_request[i].value - prev_base; 2827 } 2828 2829 /* If it's not the same as the last time, we need to relax again, 2830 because the size of the section has changed. I'm not sure we 2831 actually need to do any adjustments since the shrinking happens 2832 at the start of this section, but better safe than sorry. */ 2833 if (gregdata->n_allocated_bpo_gregs != regindex + 1) 2834 { 2835 gregdata->n_allocated_bpo_gregs = regindex + 1; 2836 *again = TRUE; 2837 } 2838 2839 bpo_gregs_section->size = (regindex + 1) * 8; 2840 } 2841 2842 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2843 { 2844 if (! link_info->keep_memory) 2845 free (isymbuf); 2846 else 2847 { 2848 /* Cache the symbols for elf_link_input_bfd. */ 2849 symtab_hdr->contents = (unsigned char *) isymbuf; 2850 } 2851 } 2852 2853 BFD_ASSERT(pjsno == mmix_elf_section_data (sec)->pjs.n_pushj_relocs); 2854 2855 if (internal_relocs != NULL 2856 && elf_section_data (sec)->relocs != internal_relocs) 2857 free (internal_relocs); 2858 2859 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2860 abort (); 2861 2862 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2863 { 2864 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum; 2865 *again = TRUE; 2866 } 2867 2868 return TRUE; 2869 2870 error_return: 2871 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2872 free (isymbuf); 2873 if (internal_relocs != NULL 2874 && elf_section_data (sec)->relocs != internal_relocs) 2875 free (internal_relocs); 2876 return FALSE; 2877 } 2878 2879 #define ELF_ARCH bfd_arch_mmix 2881 #define ELF_MACHINE_CODE EM_MMIX 2882 2883 /* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL). 2884 However, that's too much for something somewhere in the linker part of 2885 BFD; perhaps the start-address has to be a non-zero multiple of this 2886 number, or larger than this number. The symptom is that the linker 2887 complains: "warning: allocated section `.text' not in segment". We 2888 settle for 64k; the page-size used in examples is 8k. 2889 #define ELF_MAXPAGESIZE 0x10000 2890 2891 Unfortunately, this causes excessive padding in the supposedly small 2892 for-education programs that are the expected usage (where people would 2893 inspect output). We stick to 256 bytes just to have *some* default 2894 alignment. */ 2895 #define ELF_MAXPAGESIZE 0x100 2896 2897 #define TARGET_BIG_SYM mmix_elf64_vec 2898 #define TARGET_BIG_NAME "elf64-mmix" 2899 2900 #define elf_info_to_howto_rel NULL 2901 #define elf_info_to_howto mmix_info_to_howto_rela 2902 #define elf_backend_relocate_section mmix_elf_relocate_section 2903 #define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook 2904 2905 #define elf_backend_link_output_symbol_hook \ 2906 mmix_elf_link_output_symbol_hook 2907 #define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook 2908 2909 #define elf_backend_check_relocs mmix_elf_check_relocs 2910 #define elf_backend_symbol_processing mmix_elf_symbol_processing 2911 #define elf_backend_omit_section_dynsym \ 2912 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 2913 2914 #define bfd_elf64_bfd_copy_link_hash_symbol_type \ 2915 _bfd_generic_copy_link_hash_symbol_type 2916 2917 #define bfd_elf64_bfd_is_local_label_name \ 2918 mmix_elf_is_local_label_name 2919 2920 #define elf_backend_may_use_rel_p 0 2921 #define elf_backend_may_use_rela_p 1 2922 #define elf_backend_default_use_rela_p 1 2923 2924 #define elf_backend_can_gc_sections 1 2925 #define elf_backend_section_from_bfd_section \ 2926 mmix_elf_section_from_bfd_section 2927 2928 #define bfd_elf64_new_section_hook mmix_elf_new_section_hook 2929 #define bfd_elf64_bfd_final_link mmix_elf_final_link 2930 #define bfd_elf64_bfd_relax_section mmix_elf_relax_section 2931 2932 #include "elf64-target.h" 2933
Indexes created Fri May 01 00:23:41 UTC 2026