elf64-mmix.c revision 1.1.1.4
1 /* MMIX-specific support for 64-bit ELF. 2 Copyright (C) 2001-2015 Free Software Foundation, Inc. 3 Contributed by Hans-Peter Nilsson <hp (at) bitrange.com> 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 23 /* No specific ABI or "processor-specific supplement" defined. */ 24 25 /* TODO: 26 - "Traditional" linker relaxation (shrinking whole sections). 27 - Merge reloc stubs jumping to same location. 28 - GETA stub relaxation (call a stub for out of range new 29 R_MMIX_GETA_STUBBABLE). */ 30 31 #include "sysdep.h" 32 #include "bfd.h" 33 #include "libbfd.h" 34 #include "elf-bfd.h" 35 #include "elf/mmix.h" 36 #include "opcode/mmix.h" 37 38 #define MINUS_ONE (((bfd_vma) 0) - 1) 39 40 #define MAX_PUSHJ_STUB_SIZE (5 * 4) 41 42 /* Put these everywhere in new code. */ 43 #define FATAL_DEBUG \ 44 _bfd_abort (__FILE__, __LINE__, \ 45 "Internal: Non-debugged code (test-case missing)") 46 47 #define BAD_CASE(x) \ 48 _bfd_abort (__FILE__, __LINE__, \ 49 "bad case for " #x) 50 51 struct _mmix_elf_section_data 52 { 53 struct bfd_elf_section_data elf; 54 union 55 { 56 struct bpo_reloc_section_info *reloc; 57 struct bpo_greg_section_info *greg; 58 } bpo; 59 60 struct pushj_stub_info 61 { 62 /* Maximum number of stubs needed for this section. */ 63 bfd_size_type n_pushj_relocs; 64 65 /* Size of stubs after a mmix_elf_relax_section round. */ 66 bfd_size_type stubs_size_sum; 67 68 /* Per-reloc stubs_size_sum information. The stubs_size_sum member is the sum 69 of these. Allocated in mmix_elf_check_common_relocs. */ 70 bfd_size_type *stub_size; 71 72 /* Offset of next stub during relocation. Somewhat redundant with the 73 above: error coverage is easier and we don't have to reset the 74 stubs_size_sum for relocation. */ 75 bfd_size_type stub_offset; 76 } pjs; 77 78 /* Whether there has been a warning that this section could not be 79 linked due to a specific cause. FIXME: a way to access the 80 linker info or output section, then stuff the limiter guard 81 there. */ 82 bfd_boolean has_warned_bpo; 83 bfd_boolean has_warned_pushj; 84 }; 85 86 #define mmix_elf_section_data(sec) \ 87 ((struct _mmix_elf_section_data *) elf_section_data (sec)) 88 89 /* For each section containing a base-plus-offset (BPO) reloc, we attach 90 this struct as mmix_elf_section_data (section)->bpo, which is otherwise 91 NULL. */ 92 struct bpo_reloc_section_info 93 { 94 /* The base is 1; this is the first number in this section. */ 95 size_t first_base_plus_offset_reloc; 96 97 /* Number of BPO-relocs in this section. */ 98 size_t n_bpo_relocs_this_section; 99 100 /* Running index, used at relocation time. */ 101 size_t bpo_index; 102 103 /* We don't have access to the bfd_link_info struct in 104 mmix_final_link_relocate. What we really want to get at is the 105 global single struct greg_relocation, so we stash it here. */ 106 asection *bpo_greg_section; 107 }; 108 109 /* Helper struct (in global context) for the one below. 110 There's one of these created for every BPO reloc. */ 111 struct bpo_reloc_request 112 { 113 bfd_vma value; 114 115 /* Valid after relaxation. The base is 0; the first register number 116 must be added. The offset is in range 0..255. */ 117 size_t regindex; 118 size_t offset; 119 120 /* The order number for this BPO reloc, corresponding to the order in 121 which BPO relocs were found. Used to create an index after reloc 122 requests are sorted. */ 123 size_t bpo_reloc_no; 124 125 /* Set when the value is computed. Better than coding "guard values" 126 into the other members. Is FALSE only for BPO relocs in a GC:ed 127 section. */ 128 bfd_boolean valid; 129 }; 130 131 /* We attach this as mmix_elf_section_data (sec)->bpo in the linker-allocated 132 greg contents section (MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME), 133 which is linked into the register contents section 134 (MMIX_REG_CONTENTS_SECTION_NAME). This section is created by the 135 linker; using the same hook as for usual with BPO relocs does not 136 collide. */ 137 struct bpo_greg_section_info 138 { 139 /* After GC, this reflects the number of remaining, non-excluded 140 BPO-relocs. */ 141 size_t n_bpo_relocs; 142 143 /* This is the number of allocated bpo_reloc_requests; the size of 144 sorted_indexes. Valid after the check.*relocs functions are called 145 for all incoming sections. It includes the number of BPO relocs in 146 sections that were GC:ed. */ 147 size_t n_max_bpo_relocs; 148 149 /* A counter used to find out when to fold the BPO gregs, since we 150 don't have a single "after-relaxation" hook. */ 151 size_t n_remaining_bpo_relocs_this_relaxation_round; 152 153 /* The number of linker-allocated GREGs resulting from BPO relocs. 154 This is an approximation after _bfd_mmix_before_linker_allocation 155 and supposedly accurate after mmix_elf_relax_section is called for 156 all incoming non-collected sections. */ 157 size_t n_allocated_bpo_gregs; 158 159 /* Index into reloc_request[], sorted on increasing "value", secondary 160 by increasing index for strict sorting order. */ 161 size_t *bpo_reloc_indexes; 162 163 /* An array of all relocations, with the "value" member filled in by 164 the relaxation function. */ 165 struct bpo_reloc_request *reloc_request; 166 }; 167 168 169 extern bfd_boolean mmix_elf_final_link (bfd *, struct bfd_link_info *); 170 171 extern void mmix_elf_symbol_processing (bfd *, asymbol *); 172 173 /* Only intended to be called from a debugger. */ 174 extern void mmix_dump_bpo_gregs 175 (struct bfd_link_info *, bfd_error_handler_type); 176 177 static void 178 mmix_set_relaxable_size (bfd *, asection *, void *); 179 static bfd_reloc_status_type 180 mmix_elf_reloc (bfd *, arelent *, asymbol *, void *, 181 asection *, bfd *, char **); 182 static bfd_reloc_status_type 183 mmix_final_link_relocate (reloc_howto_type *, asection *, bfd_byte *, bfd_vma, 184 bfd_signed_vma, bfd_vma, const char *, asection *, 185 char **); 186 187 188 /* Watch out: this currently needs to have elements with the same index as 189 their R_MMIX_ number. */ 190 static reloc_howto_type elf_mmix_howto_table[] = 191 { 192 /* This reloc does nothing. */ 193 HOWTO (R_MMIX_NONE, /* type */ 194 0, /* rightshift */ 195 3, /* size (0 = byte, 1 = short, 2 = long) */ 196 0, /* bitsize */ 197 FALSE, /* pc_relative */ 198 0, /* bitpos */ 199 complain_overflow_dont, /* complain_on_overflow */ 200 bfd_elf_generic_reloc, /* special_function */ 201 "R_MMIX_NONE", /* name */ 202 FALSE, /* partial_inplace */ 203 0, /* src_mask */ 204 0, /* dst_mask */ 205 FALSE), /* pcrel_offset */ 206 207 /* An 8 bit absolute relocation. */ 208 HOWTO (R_MMIX_8, /* type */ 209 0, /* rightshift */ 210 0, /* size (0 = byte, 1 = short, 2 = long) */ 211 8, /* bitsize */ 212 FALSE, /* pc_relative */ 213 0, /* bitpos */ 214 complain_overflow_bitfield, /* complain_on_overflow */ 215 bfd_elf_generic_reloc, /* special_function */ 216 "R_MMIX_8", /* name */ 217 FALSE, /* partial_inplace */ 218 0, /* src_mask */ 219 0xff, /* dst_mask */ 220 FALSE), /* pcrel_offset */ 221 222 /* An 16 bit absolute relocation. */ 223 HOWTO (R_MMIX_16, /* type */ 224 0, /* rightshift */ 225 1, /* size (0 = byte, 1 = short, 2 = long) */ 226 16, /* bitsize */ 227 FALSE, /* pc_relative */ 228 0, /* bitpos */ 229 complain_overflow_bitfield, /* complain_on_overflow */ 230 bfd_elf_generic_reloc, /* special_function */ 231 "R_MMIX_16", /* name */ 232 FALSE, /* partial_inplace */ 233 0, /* src_mask */ 234 0xffff, /* dst_mask */ 235 FALSE), /* pcrel_offset */ 236 237 /* An 24 bit absolute relocation. */ 238 HOWTO (R_MMIX_24, /* type */ 239 0, /* rightshift */ 240 2, /* size (0 = byte, 1 = short, 2 = long) */ 241 24, /* bitsize */ 242 FALSE, /* pc_relative */ 243 0, /* bitpos */ 244 complain_overflow_bitfield, /* complain_on_overflow */ 245 bfd_elf_generic_reloc, /* special_function */ 246 "R_MMIX_24", /* name */ 247 FALSE, /* partial_inplace */ 248 ~0xffffff, /* src_mask */ 249 0xffffff, /* dst_mask */ 250 FALSE), /* pcrel_offset */ 251 252 /* A 32 bit absolute relocation. */ 253 HOWTO (R_MMIX_32, /* type */ 254 0, /* rightshift */ 255 2, /* size (0 = byte, 1 = short, 2 = long) */ 256 32, /* bitsize */ 257 FALSE, /* pc_relative */ 258 0, /* bitpos */ 259 complain_overflow_bitfield, /* complain_on_overflow */ 260 bfd_elf_generic_reloc, /* special_function */ 261 "R_MMIX_32", /* name */ 262 FALSE, /* partial_inplace */ 263 0, /* src_mask */ 264 0xffffffff, /* dst_mask */ 265 FALSE), /* pcrel_offset */ 266 267 /* 64 bit relocation. */ 268 HOWTO (R_MMIX_64, /* type */ 269 0, /* rightshift */ 270 4, /* size (0 = byte, 1 = short, 2 = long) */ 271 64, /* bitsize */ 272 FALSE, /* pc_relative */ 273 0, /* bitpos */ 274 complain_overflow_bitfield, /* complain_on_overflow */ 275 bfd_elf_generic_reloc, /* special_function */ 276 "R_MMIX_64", /* name */ 277 FALSE, /* partial_inplace */ 278 0, /* src_mask */ 279 MINUS_ONE, /* dst_mask */ 280 FALSE), /* pcrel_offset */ 281 282 /* An 8 bit PC-relative relocation. */ 283 HOWTO (R_MMIX_PC_8, /* type */ 284 0, /* rightshift */ 285 0, /* size (0 = byte, 1 = short, 2 = long) */ 286 8, /* bitsize */ 287 TRUE, /* pc_relative */ 288 0, /* bitpos */ 289 complain_overflow_bitfield, /* complain_on_overflow */ 290 bfd_elf_generic_reloc, /* special_function */ 291 "R_MMIX_PC_8", /* name */ 292 FALSE, /* partial_inplace */ 293 0, /* src_mask */ 294 0xff, /* dst_mask */ 295 TRUE), /* pcrel_offset */ 296 297 /* An 16 bit PC-relative relocation. */ 298 HOWTO (R_MMIX_PC_16, /* type */ 299 0, /* rightshift */ 300 1, /* size (0 = byte, 1 = short, 2 = long) */ 301 16, /* bitsize */ 302 TRUE, /* pc_relative */ 303 0, /* bitpos */ 304 complain_overflow_bitfield, /* complain_on_overflow */ 305 bfd_elf_generic_reloc, /* special_function */ 306 "R_MMIX_PC_16", /* name */ 307 FALSE, /* partial_inplace */ 308 0, /* src_mask */ 309 0xffff, /* dst_mask */ 310 TRUE), /* pcrel_offset */ 311 312 /* An 24 bit PC-relative relocation. */ 313 HOWTO (R_MMIX_PC_24, /* type */ 314 0, /* rightshift */ 315 2, /* size (0 = byte, 1 = short, 2 = long) */ 316 24, /* bitsize */ 317 TRUE, /* pc_relative */ 318 0, /* bitpos */ 319 complain_overflow_bitfield, /* complain_on_overflow */ 320 bfd_elf_generic_reloc, /* special_function */ 321 "R_MMIX_PC_24", /* name */ 322 FALSE, /* partial_inplace */ 323 ~0xffffff, /* src_mask */ 324 0xffffff, /* dst_mask */ 325 TRUE), /* pcrel_offset */ 326 327 /* A 32 bit absolute PC-relative relocation. */ 328 HOWTO (R_MMIX_PC_32, /* type */ 329 0, /* rightshift */ 330 2, /* size (0 = byte, 1 = short, 2 = long) */ 331 32, /* bitsize */ 332 TRUE, /* pc_relative */ 333 0, /* bitpos */ 334 complain_overflow_bitfield, /* complain_on_overflow */ 335 bfd_elf_generic_reloc, /* special_function */ 336 "R_MMIX_PC_32", /* name */ 337 FALSE, /* partial_inplace */ 338 0, /* src_mask */ 339 0xffffffff, /* dst_mask */ 340 TRUE), /* pcrel_offset */ 341 342 /* 64 bit PC-relative relocation. */ 343 HOWTO (R_MMIX_PC_64, /* type */ 344 0, /* rightshift */ 345 4, /* size (0 = byte, 1 = short, 2 = long) */ 346 64, /* bitsize */ 347 TRUE, /* pc_relative */ 348 0, /* bitpos */ 349 complain_overflow_bitfield, /* complain_on_overflow */ 350 bfd_elf_generic_reloc, /* special_function */ 351 "R_MMIX_PC_64", /* name */ 352 FALSE, /* partial_inplace */ 353 0, /* src_mask */ 354 MINUS_ONE, /* dst_mask */ 355 TRUE), /* pcrel_offset */ 356 357 /* GNU extension to record C++ vtable hierarchy. */ 358 HOWTO (R_MMIX_GNU_VTINHERIT, /* type */ 359 0, /* rightshift */ 360 0, /* size (0 = byte, 1 = short, 2 = long) */ 361 0, /* bitsize */ 362 FALSE, /* pc_relative */ 363 0, /* bitpos */ 364 complain_overflow_dont, /* complain_on_overflow */ 365 NULL, /* special_function */ 366 "R_MMIX_GNU_VTINHERIT", /* name */ 367 FALSE, /* partial_inplace */ 368 0, /* src_mask */ 369 0, /* dst_mask */ 370 TRUE), /* pcrel_offset */ 371 372 /* GNU extension to record C++ vtable member usage. */ 373 HOWTO (R_MMIX_GNU_VTENTRY, /* type */ 374 0, /* rightshift */ 375 0, /* size (0 = byte, 1 = short, 2 = long) */ 376 0, /* bitsize */ 377 FALSE, /* pc_relative */ 378 0, /* bitpos */ 379 complain_overflow_dont, /* complain_on_overflow */ 380 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 381 "R_MMIX_GNU_VTENTRY", /* name */ 382 FALSE, /* partial_inplace */ 383 0, /* src_mask */ 384 0, /* dst_mask */ 385 FALSE), /* pcrel_offset */ 386 387 /* The GETA relocation is supposed to get any address that could 388 possibly be reached by the GETA instruction. It can silently expand 389 to get a 64-bit operand, but will complain if any of the two least 390 significant bits are set. The howto members reflect a simple GETA. */ 391 HOWTO (R_MMIX_GETA, /* type */ 392 2, /* rightshift */ 393 2, /* size (0 = byte, 1 = short, 2 = long) */ 394 19, /* bitsize */ 395 TRUE, /* pc_relative */ 396 0, /* bitpos */ 397 complain_overflow_signed, /* complain_on_overflow */ 398 mmix_elf_reloc, /* special_function */ 399 "R_MMIX_GETA", /* name */ 400 FALSE, /* partial_inplace */ 401 ~0x0100ffff, /* src_mask */ 402 0x0100ffff, /* dst_mask */ 403 TRUE), /* pcrel_offset */ 404 405 HOWTO (R_MMIX_GETA_1, /* type */ 406 2, /* rightshift */ 407 2, /* size (0 = byte, 1 = short, 2 = long) */ 408 19, /* bitsize */ 409 TRUE, /* pc_relative */ 410 0, /* bitpos */ 411 complain_overflow_signed, /* complain_on_overflow */ 412 mmix_elf_reloc, /* special_function */ 413 "R_MMIX_GETA_1", /* name */ 414 FALSE, /* partial_inplace */ 415 ~0x0100ffff, /* src_mask */ 416 0x0100ffff, /* dst_mask */ 417 TRUE), /* pcrel_offset */ 418 419 HOWTO (R_MMIX_GETA_2, /* type */ 420 2, /* rightshift */ 421 2, /* size (0 = byte, 1 = short, 2 = long) */ 422 19, /* bitsize */ 423 TRUE, /* pc_relative */ 424 0, /* bitpos */ 425 complain_overflow_signed, /* complain_on_overflow */ 426 mmix_elf_reloc, /* special_function */ 427 "R_MMIX_GETA_2", /* name */ 428 FALSE, /* partial_inplace */ 429 ~0x0100ffff, /* src_mask */ 430 0x0100ffff, /* dst_mask */ 431 TRUE), /* pcrel_offset */ 432 433 HOWTO (R_MMIX_GETA_3, /* type */ 434 2, /* rightshift */ 435 2, /* size (0 = byte, 1 = short, 2 = long) */ 436 19, /* bitsize */ 437 TRUE, /* pc_relative */ 438 0, /* bitpos */ 439 complain_overflow_signed, /* complain_on_overflow */ 440 mmix_elf_reloc, /* special_function */ 441 "R_MMIX_GETA_3", /* name */ 442 FALSE, /* partial_inplace */ 443 ~0x0100ffff, /* src_mask */ 444 0x0100ffff, /* dst_mask */ 445 TRUE), /* pcrel_offset */ 446 447 /* The conditional branches are supposed to reach any (code) address. 448 It can silently expand to a 64-bit operand, but will emit an error if 449 any of the two least significant bits are set. The howto members 450 reflect a simple branch. */ 451 HOWTO (R_MMIX_CBRANCH, /* type */ 452 2, /* rightshift */ 453 2, /* size (0 = byte, 1 = short, 2 = long) */ 454 19, /* bitsize */ 455 TRUE, /* pc_relative */ 456 0, /* bitpos */ 457 complain_overflow_signed, /* complain_on_overflow */ 458 mmix_elf_reloc, /* special_function */ 459 "R_MMIX_CBRANCH", /* name */ 460 FALSE, /* partial_inplace */ 461 ~0x0100ffff, /* src_mask */ 462 0x0100ffff, /* dst_mask */ 463 TRUE), /* pcrel_offset */ 464 465 HOWTO (R_MMIX_CBRANCH_J, /* type */ 466 2, /* rightshift */ 467 2, /* size (0 = byte, 1 = short, 2 = long) */ 468 19, /* bitsize */ 469 TRUE, /* pc_relative */ 470 0, /* bitpos */ 471 complain_overflow_signed, /* complain_on_overflow */ 472 mmix_elf_reloc, /* special_function */ 473 "R_MMIX_CBRANCH_J", /* name */ 474 FALSE, /* partial_inplace */ 475 ~0x0100ffff, /* src_mask */ 476 0x0100ffff, /* dst_mask */ 477 TRUE), /* pcrel_offset */ 478 479 HOWTO (R_MMIX_CBRANCH_1, /* type */ 480 2, /* rightshift */ 481 2, /* size (0 = byte, 1 = short, 2 = long) */ 482 19, /* bitsize */ 483 TRUE, /* pc_relative */ 484 0, /* bitpos */ 485 complain_overflow_signed, /* complain_on_overflow */ 486 mmix_elf_reloc, /* special_function */ 487 "R_MMIX_CBRANCH_1", /* name */ 488 FALSE, /* partial_inplace */ 489 ~0x0100ffff, /* src_mask */ 490 0x0100ffff, /* dst_mask */ 491 TRUE), /* pcrel_offset */ 492 493 HOWTO (R_MMIX_CBRANCH_2, /* type */ 494 2, /* rightshift */ 495 2, /* size (0 = byte, 1 = short, 2 = long) */ 496 19, /* bitsize */ 497 TRUE, /* pc_relative */ 498 0, /* bitpos */ 499 complain_overflow_signed, /* complain_on_overflow */ 500 mmix_elf_reloc, /* special_function */ 501 "R_MMIX_CBRANCH_2", /* name */ 502 FALSE, /* partial_inplace */ 503 ~0x0100ffff, /* src_mask */ 504 0x0100ffff, /* dst_mask */ 505 TRUE), /* pcrel_offset */ 506 507 HOWTO (R_MMIX_CBRANCH_3, /* type */ 508 2, /* rightshift */ 509 2, /* size (0 = byte, 1 = short, 2 = long) */ 510 19, /* bitsize */ 511 TRUE, /* pc_relative */ 512 0, /* bitpos */ 513 complain_overflow_signed, /* complain_on_overflow */ 514 mmix_elf_reloc, /* special_function */ 515 "R_MMIX_CBRANCH_3", /* name */ 516 FALSE, /* partial_inplace */ 517 ~0x0100ffff, /* src_mask */ 518 0x0100ffff, /* dst_mask */ 519 TRUE), /* pcrel_offset */ 520 521 /* The PUSHJ instruction can reach any (code) address, as long as it's 522 the beginning of a function (no usable restriction). It can silently 523 expand to a 64-bit operand, but will emit an error if any of the two 524 least significant bits are set. It can also expand into a call to a 525 stub; see R_MMIX_PUSHJ_STUBBABLE. The howto members reflect a simple 526 PUSHJ. */ 527 HOWTO (R_MMIX_PUSHJ, /* type */ 528 2, /* rightshift */ 529 2, /* size (0 = byte, 1 = short, 2 = long) */ 530 19, /* bitsize */ 531 TRUE, /* pc_relative */ 532 0, /* bitpos */ 533 complain_overflow_signed, /* complain_on_overflow */ 534 mmix_elf_reloc, /* special_function */ 535 "R_MMIX_PUSHJ", /* name */ 536 FALSE, /* partial_inplace */ 537 ~0x0100ffff, /* src_mask */ 538 0x0100ffff, /* dst_mask */ 539 TRUE), /* pcrel_offset */ 540 541 HOWTO (R_MMIX_PUSHJ_1, /* type */ 542 2, /* rightshift */ 543 2, /* size (0 = byte, 1 = short, 2 = long) */ 544 19, /* bitsize */ 545 TRUE, /* pc_relative */ 546 0, /* bitpos */ 547 complain_overflow_signed, /* complain_on_overflow */ 548 mmix_elf_reloc, /* special_function */ 549 "R_MMIX_PUSHJ_1", /* name */ 550 FALSE, /* partial_inplace */ 551 ~0x0100ffff, /* src_mask */ 552 0x0100ffff, /* dst_mask */ 553 TRUE), /* pcrel_offset */ 554 555 HOWTO (R_MMIX_PUSHJ_2, /* type */ 556 2, /* rightshift */ 557 2, /* size (0 = byte, 1 = short, 2 = long) */ 558 19, /* bitsize */ 559 TRUE, /* pc_relative */ 560 0, /* bitpos */ 561 complain_overflow_signed, /* complain_on_overflow */ 562 mmix_elf_reloc, /* special_function */ 563 "R_MMIX_PUSHJ_2", /* name */ 564 FALSE, /* partial_inplace */ 565 ~0x0100ffff, /* src_mask */ 566 0x0100ffff, /* dst_mask */ 567 TRUE), /* pcrel_offset */ 568 569 HOWTO (R_MMIX_PUSHJ_3, /* type */ 570 2, /* rightshift */ 571 2, /* size (0 = byte, 1 = short, 2 = long) */ 572 19, /* bitsize */ 573 TRUE, /* pc_relative */ 574 0, /* bitpos */ 575 complain_overflow_signed, /* complain_on_overflow */ 576 mmix_elf_reloc, /* special_function */ 577 "R_MMIX_PUSHJ_3", /* name */ 578 FALSE, /* partial_inplace */ 579 ~0x0100ffff, /* src_mask */ 580 0x0100ffff, /* dst_mask */ 581 TRUE), /* pcrel_offset */ 582 583 /* A JMP is supposed to reach any (code) address. By itself, it can 584 reach +-64M; the expansion can reach all 64 bits. Note that the 64M 585 limit is soon reached if you link the program in wildly different 586 memory segments. The howto members reflect a trivial JMP. */ 587 HOWTO (R_MMIX_JMP, /* type */ 588 2, /* rightshift */ 589 2, /* size (0 = byte, 1 = short, 2 = long) */ 590 27, /* bitsize */ 591 TRUE, /* pc_relative */ 592 0, /* bitpos */ 593 complain_overflow_signed, /* complain_on_overflow */ 594 mmix_elf_reloc, /* special_function */ 595 "R_MMIX_JMP", /* name */ 596 FALSE, /* partial_inplace */ 597 ~0x1ffffff, /* src_mask */ 598 0x1ffffff, /* dst_mask */ 599 TRUE), /* pcrel_offset */ 600 601 HOWTO (R_MMIX_JMP_1, /* type */ 602 2, /* rightshift */ 603 2, /* size (0 = byte, 1 = short, 2 = long) */ 604 27, /* bitsize */ 605 TRUE, /* pc_relative */ 606 0, /* bitpos */ 607 complain_overflow_signed, /* complain_on_overflow */ 608 mmix_elf_reloc, /* special_function */ 609 "R_MMIX_JMP_1", /* name */ 610 FALSE, /* partial_inplace */ 611 ~0x1ffffff, /* src_mask */ 612 0x1ffffff, /* dst_mask */ 613 TRUE), /* pcrel_offset */ 614 615 HOWTO (R_MMIX_JMP_2, /* type */ 616 2, /* rightshift */ 617 2, /* size (0 = byte, 1 = short, 2 = long) */ 618 27, /* bitsize */ 619 TRUE, /* pc_relative */ 620 0, /* bitpos */ 621 complain_overflow_signed, /* complain_on_overflow */ 622 mmix_elf_reloc, /* special_function */ 623 "R_MMIX_JMP_2", /* name */ 624 FALSE, /* partial_inplace */ 625 ~0x1ffffff, /* src_mask */ 626 0x1ffffff, /* dst_mask */ 627 TRUE), /* pcrel_offset */ 628 629 HOWTO (R_MMIX_JMP_3, /* type */ 630 2, /* rightshift */ 631 2, /* size (0 = byte, 1 = short, 2 = long) */ 632 27, /* bitsize */ 633 TRUE, /* pc_relative */ 634 0, /* bitpos */ 635 complain_overflow_signed, /* complain_on_overflow */ 636 mmix_elf_reloc, /* special_function */ 637 "R_MMIX_JMP_3", /* name */ 638 FALSE, /* partial_inplace */ 639 ~0x1ffffff, /* src_mask */ 640 0x1ffffff, /* dst_mask */ 641 TRUE), /* pcrel_offset */ 642 643 /* When we don't emit link-time-relaxable code from the assembler, or 644 when relaxation has done all it can do, these relocs are used. For 645 GETA/PUSHJ/branches. */ 646 HOWTO (R_MMIX_ADDR19, /* type */ 647 2, /* rightshift */ 648 2, /* size (0 = byte, 1 = short, 2 = long) */ 649 19, /* bitsize */ 650 TRUE, /* pc_relative */ 651 0, /* bitpos */ 652 complain_overflow_signed, /* complain_on_overflow */ 653 mmix_elf_reloc, /* special_function */ 654 "R_MMIX_ADDR19", /* name */ 655 FALSE, /* partial_inplace */ 656 ~0x0100ffff, /* src_mask */ 657 0x0100ffff, /* dst_mask */ 658 TRUE), /* pcrel_offset */ 659 660 /* For JMP. */ 661 HOWTO (R_MMIX_ADDR27, /* type */ 662 2, /* rightshift */ 663 2, /* size (0 = byte, 1 = short, 2 = long) */ 664 27, /* bitsize */ 665 TRUE, /* pc_relative */ 666 0, /* bitpos */ 667 complain_overflow_signed, /* complain_on_overflow */ 668 mmix_elf_reloc, /* special_function */ 669 "R_MMIX_ADDR27", /* name */ 670 FALSE, /* partial_inplace */ 671 ~0x1ffffff, /* src_mask */ 672 0x1ffffff, /* dst_mask */ 673 TRUE), /* pcrel_offset */ 674 675 /* A general register or the value 0..255. If a value, then the 676 instruction (offset -3) needs adjusting. */ 677 HOWTO (R_MMIX_REG_OR_BYTE, /* type */ 678 0, /* rightshift */ 679 1, /* size (0 = byte, 1 = short, 2 = long) */ 680 8, /* bitsize */ 681 FALSE, /* pc_relative */ 682 0, /* bitpos */ 683 complain_overflow_bitfield, /* complain_on_overflow */ 684 mmix_elf_reloc, /* special_function */ 685 "R_MMIX_REG_OR_BYTE", /* name */ 686 FALSE, /* partial_inplace */ 687 0, /* src_mask */ 688 0xff, /* dst_mask */ 689 FALSE), /* pcrel_offset */ 690 691 /* A general register. */ 692 HOWTO (R_MMIX_REG, /* type */ 693 0, /* rightshift */ 694 1, /* size (0 = byte, 1 = short, 2 = long) */ 695 8, /* bitsize */ 696 FALSE, /* pc_relative */ 697 0, /* bitpos */ 698 complain_overflow_bitfield, /* complain_on_overflow */ 699 mmix_elf_reloc, /* special_function */ 700 "R_MMIX_REG", /* name */ 701 FALSE, /* partial_inplace */ 702 0, /* src_mask */ 703 0xff, /* dst_mask */ 704 FALSE), /* pcrel_offset */ 705 706 /* A register plus an index, corresponding to the relocation expression. 707 The sizes must correspond to the valid range of the expression, while 708 the bitmasks correspond to what we store in the image. */ 709 HOWTO (R_MMIX_BASE_PLUS_OFFSET, /* type */ 710 0, /* rightshift */ 711 4, /* size (0 = byte, 1 = short, 2 = long) */ 712 64, /* bitsize */ 713 FALSE, /* pc_relative */ 714 0, /* bitpos */ 715 complain_overflow_bitfield, /* complain_on_overflow */ 716 mmix_elf_reloc, /* special_function */ 717 "R_MMIX_BASE_PLUS_OFFSET", /* name */ 718 FALSE, /* partial_inplace */ 719 0, /* src_mask */ 720 0xffff, /* dst_mask */ 721 FALSE), /* pcrel_offset */ 722 723 /* A "magic" relocation for a LOCAL expression, asserting that the 724 expression is less than the number of global registers. No actual 725 modification of the contents is done. Implementing this as a 726 relocation was less intrusive than e.g. putting such expressions in a 727 section to discard *after* relocation. */ 728 HOWTO (R_MMIX_LOCAL, /* type */ 729 0, /* rightshift */ 730 0, /* size (0 = byte, 1 = short, 2 = long) */ 731 0, /* bitsize */ 732 FALSE, /* pc_relative */ 733 0, /* bitpos */ 734 complain_overflow_dont, /* complain_on_overflow */ 735 mmix_elf_reloc, /* special_function */ 736 "R_MMIX_LOCAL", /* name */ 737 FALSE, /* partial_inplace */ 738 0, /* src_mask */ 739 0, /* dst_mask */ 740 FALSE), /* pcrel_offset */ 741 742 HOWTO (R_MMIX_PUSHJ_STUBBABLE, /* type */ 743 2, /* rightshift */ 744 2, /* size (0 = byte, 1 = short, 2 = long) */ 745 19, /* bitsize */ 746 TRUE, /* pc_relative */ 747 0, /* bitpos */ 748 complain_overflow_signed, /* complain_on_overflow */ 749 mmix_elf_reloc, /* special_function */ 750 "R_MMIX_PUSHJ_STUBBABLE", /* name */ 751 FALSE, /* partial_inplace */ 752 ~0x0100ffff, /* src_mask */ 753 0x0100ffff, /* dst_mask */ 754 TRUE) /* pcrel_offset */ 755 }; 756 757 758 /* Map BFD reloc types to MMIX ELF reloc types. */ 759 760 struct mmix_reloc_map 761 { 762 bfd_reloc_code_real_type bfd_reloc_val; 763 enum elf_mmix_reloc_type elf_reloc_val; 764 }; 765 766 767 static const struct mmix_reloc_map mmix_reloc_map[] = 768 { 769 {BFD_RELOC_NONE, R_MMIX_NONE}, 770 {BFD_RELOC_8, R_MMIX_8}, 771 {BFD_RELOC_16, R_MMIX_16}, 772 {BFD_RELOC_24, R_MMIX_24}, 773 {BFD_RELOC_32, R_MMIX_32}, 774 {BFD_RELOC_64, R_MMIX_64}, 775 {BFD_RELOC_8_PCREL, R_MMIX_PC_8}, 776 {BFD_RELOC_16_PCREL, R_MMIX_PC_16}, 777 {BFD_RELOC_24_PCREL, R_MMIX_PC_24}, 778 {BFD_RELOC_32_PCREL, R_MMIX_PC_32}, 779 {BFD_RELOC_64_PCREL, R_MMIX_PC_64}, 780 {BFD_RELOC_VTABLE_INHERIT, R_MMIX_GNU_VTINHERIT}, 781 {BFD_RELOC_VTABLE_ENTRY, R_MMIX_GNU_VTENTRY}, 782 {BFD_RELOC_MMIX_GETA, R_MMIX_GETA}, 783 {BFD_RELOC_MMIX_CBRANCH, R_MMIX_CBRANCH}, 784 {BFD_RELOC_MMIX_PUSHJ, R_MMIX_PUSHJ}, 785 {BFD_RELOC_MMIX_JMP, R_MMIX_JMP}, 786 {BFD_RELOC_MMIX_ADDR19, R_MMIX_ADDR19}, 787 {BFD_RELOC_MMIX_ADDR27, R_MMIX_ADDR27}, 788 {BFD_RELOC_MMIX_REG_OR_BYTE, R_MMIX_REG_OR_BYTE}, 789 {BFD_RELOC_MMIX_REG, R_MMIX_REG}, 790 {BFD_RELOC_MMIX_BASE_PLUS_OFFSET, R_MMIX_BASE_PLUS_OFFSET}, 791 {BFD_RELOC_MMIX_LOCAL, R_MMIX_LOCAL}, 792 {BFD_RELOC_MMIX_PUSHJ_STUBBABLE, R_MMIX_PUSHJ_STUBBABLE} 793 }; 794 795 static reloc_howto_type * 796 bfd_elf64_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 797 bfd_reloc_code_real_type code) 798 { 799 unsigned int i; 800 801 for (i = 0; 802 i < sizeof (mmix_reloc_map) / sizeof (mmix_reloc_map[0]); 803 i++) 804 { 805 if (mmix_reloc_map[i].bfd_reloc_val == code) 806 return &elf_mmix_howto_table[mmix_reloc_map[i].elf_reloc_val]; 807 } 808 809 return NULL; 810 } 811 812 static reloc_howto_type * 813 bfd_elf64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 814 const char *r_name) 815 { 816 unsigned int i; 817 818 for (i = 0; 819 i < sizeof (elf_mmix_howto_table) / sizeof (elf_mmix_howto_table[0]); 820 i++) 821 if (elf_mmix_howto_table[i].name != NULL 822 && strcasecmp (elf_mmix_howto_table[i].name, r_name) == 0) 823 return &elf_mmix_howto_table[i]; 824 825 return NULL; 826 } 827 828 static bfd_boolean 829 mmix_elf_new_section_hook (bfd *abfd, asection *sec) 830 { 831 if (!sec->used_by_bfd) 832 { 833 struct _mmix_elf_section_data *sdata; 834 bfd_size_type amt = sizeof (*sdata); 835 836 sdata = bfd_zalloc (abfd, amt); 837 if (sdata == NULL) 838 return FALSE; 839 sec->used_by_bfd = sdata; 840 } 841 842 return _bfd_elf_new_section_hook (abfd, sec); 843 } 844 845 846 /* This function performs the actual bitfiddling and sanity check for a 847 final relocation. Each relocation gets its *worst*-case expansion 848 in size when it arrives here; any reduction in size should have been 849 caught in linker relaxation earlier. When we get here, the relocation 850 looks like the smallest instruction with SWYM:s (nop:s) appended to the 851 max size. We fill in those nop:s. 852 853 R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra) 854 GETA $N,foo 855 -> 856 SETL $N,foo & 0xffff 857 INCML $N,(foo >> 16) & 0xffff 858 INCMH $N,(foo >> 32) & 0xffff 859 INCH $N,(foo >> 48) & 0xffff 860 861 R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but 862 condbranches needing relaxation might be rare enough to not be 863 worthwhile.) 864 [P]Bcc $N,foo 865 -> 866 [~P]B~cc $N,.+20 867 SETL $255,foo & ... 868 INCML ... 869 INCMH ... 870 INCH ... 871 GO $255,$255,0 872 873 R_MMIX_PUSHJ: (FIXME: Relaxation...) 874 PUSHJ $N,foo 875 -> 876 SETL $255,foo & ... 877 INCML ... 878 INCMH ... 879 INCH ... 880 PUSHGO $N,$255,0 881 882 R_MMIX_JMP: (FIXME: Relaxation...) 883 JMP foo 884 -> 885 SETL $255,foo & ... 886 INCML ... 887 INCMH ... 888 INCH ... 889 GO $255,$255,0 890 891 R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */ 892 893 static bfd_reloc_status_type 894 mmix_elf_perform_relocation (asection *isec, reloc_howto_type *howto, 895 void *datap, bfd_vma addr, bfd_vma value, 896 char **error_message) 897 { 898 bfd *abfd = isec->owner; 899 bfd_reloc_status_type flag = bfd_reloc_ok; 900 bfd_reloc_status_type r; 901 int offs = 0; 902 int reg = 255; 903 904 /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences. 905 We handle the differences here and the common sequence later. */ 906 switch (howto->type) 907 { 908 case R_MMIX_GETA: 909 offs = 0; 910 reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 911 912 /* We change to an absolute value. */ 913 value += addr; 914 break; 915 916 case R_MMIX_CBRANCH: 917 { 918 int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16; 919 920 /* Invert the condition and prediction bit, and set the offset 921 to five instructions ahead. 922 923 We *can* do better if we want to. If the branch is found to be 924 within limits, we could leave the branch as is; there'll just 925 be a bunch of NOP:s after it. But we shouldn't see this 926 sequence often enough that it's worth doing it. */ 927 928 bfd_put_32 (abfd, 929 (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff) 930 | (24/4)), 931 (bfd_byte *) datap); 932 933 /* Put a "GO $255,$255,0" after the common sequence. */ 934 bfd_put_32 (abfd, 935 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00, 936 (bfd_byte *) datap + 20); 937 938 /* Common sequence starts at offset 4. */ 939 offs = 4; 940 941 /* We change to an absolute value. */ 942 value += addr; 943 } 944 break; 945 946 case R_MMIX_PUSHJ_STUBBABLE: 947 /* If the address fits, we're fine. */ 948 if ((value & 3) == 0 949 /* Note rightshift 0; see R_MMIX_JMP case below. */ 950 && (r = bfd_check_overflow (complain_overflow_signed, 951 howto->bitsize, 952 0, 953 bfd_arch_bits_per_address (abfd), 954 value)) == bfd_reloc_ok) 955 goto pcrel_mmix_reloc_fits; 956 else 957 { 958 bfd_size_type size = isec->rawsize ? isec->rawsize : isec->size; 959 960 /* We have the bytes at the PUSHJ insn and need to get the 961 position for the stub. There's supposed to be room allocated 962 for the stub. */ 963 bfd_byte *stubcontents 964 = ((bfd_byte *) datap 965 - (addr - (isec->output_section->vma + isec->output_offset)) 966 + size 967 + mmix_elf_section_data (isec)->pjs.stub_offset); 968 bfd_vma stubaddr; 969 970 if (mmix_elf_section_data (isec)->pjs.n_pushj_relocs == 0) 971 { 972 /* This shouldn't happen when linking to ELF or mmo, so 973 this is an attempt to link to "binary", right? We 974 can't access the output bfd, so we can't verify that 975 assumption. We only know that the critical 976 mmix_elf_check_common_relocs has not been called, 977 which happens when the output format is different 978 from the input format (and is not mmo). */ 979 if (! mmix_elf_section_data (isec)->has_warned_pushj) 980 { 981 /* For the first such error per input section, produce 982 a verbose message. */ 983 *error_message 984 = _("invalid input relocation when producing" 985 " non-ELF, non-mmo format output." 986 "\n Please use the objcopy program to convert from" 987 " ELF or mmo," 988 "\n or assemble using" 989 " \"-no-expand\" (for gcc, \"-Wa,-no-expand\""); 990 mmix_elf_section_data (isec)->has_warned_pushj = TRUE; 991 return bfd_reloc_dangerous; 992 } 993 994 /* For subsequent errors, return this one, which is 995 rate-limited but looks a little bit different, 996 hopefully without affecting user-friendliness. */ 997 return bfd_reloc_overflow; 998 } 999 1000 /* The address doesn't fit, so redirect the PUSHJ to the 1001 location of the stub. */ 1002 r = mmix_elf_perform_relocation (isec, 1003 &elf_mmix_howto_table 1004 [R_MMIX_ADDR19], 1005 datap, 1006 addr, 1007 isec->output_section->vma 1008 + isec->output_offset 1009 + size 1010 + (mmix_elf_section_data (isec) 1011 ->pjs.stub_offset) 1012 - addr, 1013 error_message); 1014 if (r != bfd_reloc_ok) 1015 return r; 1016 1017 stubaddr 1018 = (isec->output_section->vma 1019 + isec->output_offset 1020 + size 1021 + mmix_elf_section_data (isec)->pjs.stub_offset); 1022 1023 /* We generate a simple JMP if that suffices, else the whole 5 1024 insn stub. */ 1025 if (bfd_check_overflow (complain_overflow_signed, 1026 elf_mmix_howto_table[R_MMIX_ADDR27].bitsize, 1027 0, 1028 bfd_arch_bits_per_address (abfd), 1029 addr + value - stubaddr) == bfd_reloc_ok) 1030 { 1031 bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents); 1032 r = mmix_elf_perform_relocation (isec, 1033 &elf_mmix_howto_table 1034 [R_MMIX_ADDR27], 1035 stubcontents, 1036 stubaddr, 1037 value + addr - stubaddr, 1038 error_message); 1039 mmix_elf_section_data (isec)->pjs.stub_offset += 4; 1040 1041 if (size + mmix_elf_section_data (isec)->pjs.stub_offset 1042 > isec->size) 1043 abort (); 1044 1045 return r; 1046 } 1047 else 1048 { 1049 /* Put a "GO $255,0" after the common sequence. */ 1050 bfd_put_32 (abfd, 1051 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1052 | 0xff00, (bfd_byte *) stubcontents + 16); 1053 1054 /* Prepare for the general code to set the first part of the 1055 linker stub, and */ 1056 value += addr; 1057 datap = stubcontents; 1058 mmix_elf_section_data (isec)->pjs.stub_offset 1059 += MAX_PUSHJ_STUB_SIZE; 1060 } 1061 } 1062 break; 1063 1064 case R_MMIX_PUSHJ: 1065 { 1066 int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 1067 1068 /* Put a "PUSHGO $N,$255,0" after the common sequence. */ 1069 bfd_put_32 (abfd, 1070 ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1071 | (inreg << 16) 1072 | 0xff00, 1073 (bfd_byte *) datap + 16); 1074 1075 /* We change to an absolute value. */ 1076 value += addr; 1077 } 1078 break; 1079 1080 case R_MMIX_JMP: 1081 /* This one is a little special. If we get here on a non-relaxing 1082 link, and the destination is actually in range, we don't need to 1083 execute the nops. 1084 If so, we fall through to the bit-fiddling relocs. 1085 1086 FIXME: bfd_check_overflow seems broken; the relocation is 1087 rightshifted before testing, so supply a zero rightshift. */ 1088 1089 if (! ((value & 3) == 0 1090 && (r = bfd_check_overflow (complain_overflow_signed, 1091 howto->bitsize, 1092 0, 1093 bfd_arch_bits_per_address (abfd), 1094 value)) == bfd_reloc_ok)) 1095 { 1096 /* If the relocation doesn't fit in a JMP, we let the NOP:s be 1097 modified below, and put a "GO $255,$255,0" after the 1098 address-loading sequence. */ 1099 bfd_put_32 (abfd, 1100 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1101 | 0xffff00, 1102 (bfd_byte *) datap + 16); 1103 1104 /* We change to an absolute value. */ 1105 value += addr; 1106 break; 1107 } 1108 /* FALLTHROUGH. */ 1109 case R_MMIX_ADDR19: 1110 case R_MMIX_ADDR27: 1111 pcrel_mmix_reloc_fits: 1112 /* These must be in range, or else we emit an error. */ 1113 if ((value & 3) == 0 1114 /* Note rightshift 0; see above. */ 1115 && (r = bfd_check_overflow (complain_overflow_signed, 1116 howto->bitsize, 1117 0, 1118 bfd_arch_bits_per_address (abfd), 1119 value)) == bfd_reloc_ok) 1120 { 1121 bfd_vma in1 1122 = bfd_get_32 (abfd, (bfd_byte *) datap); 1123 bfd_vma highbit; 1124 1125 if ((bfd_signed_vma) value < 0) 1126 { 1127 highbit = 1 << 24; 1128 value += (1 << (howto->bitsize - 1)); 1129 } 1130 else 1131 highbit = 0; 1132 1133 value >>= 2; 1134 1135 bfd_put_32 (abfd, 1136 (in1 & howto->src_mask) 1137 | highbit 1138 | (value & howto->dst_mask), 1139 (bfd_byte *) datap); 1140 1141 return bfd_reloc_ok; 1142 } 1143 else 1144 return bfd_reloc_overflow; 1145 1146 case R_MMIX_BASE_PLUS_OFFSET: 1147 { 1148 struct bpo_reloc_section_info *bpodata 1149 = mmix_elf_section_data (isec)->bpo.reloc; 1150 asection *bpo_greg_section; 1151 struct bpo_greg_section_info *gregdata; 1152 size_t bpo_index; 1153 1154 if (bpodata == NULL) 1155 { 1156 /* This shouldn't happen when linking to ELF or mmo, so 1157 this is an attempt to link to "binary", right? We 1158 can't access the output bfd, so we can't verify that 1159 assumption. We only know that the critical 1160 mmix_elf_check_common_relocs has not been called, which 1161 happens when the output format is different from the 1162 input format (and is not mmo). */ 1163 if (! mmix_elf_section_data (isec)->has_warned_bpo) 1164 { 1165 /* For the first such error per input section, produce 1166 a verbose message. */ 1167 *error_message 1168 = _("invalid input relocation when producing" 1169 " non-ELF, non-mmo format output." 1170 "\n Please use the objcopy program to convert from" 1171 " ELF or mmo," 1172 "\n or compile using the gcc-option" 1173 " \"-mno-base-addresses\"."); 1174 mmix_elf_section_data (isec)->has_warned_bpo = TRUE; 1175 return bfd_reloc_dangerous; 1176 } 1177 1178 /* For subsequent errors, return this one, which is 1179 rate-limited but looks a little bit different, 1180 hopefully without affecting user-friendliness. */ 1181 return bfd_reloc_overflow; 1182 } 1183 1184 bpo_greg_section = bpodata->bpo_greg_section; 1185 gregdata = mmix_elf_section_data (bpo_greg_section)->bpo.greg; 1186 bpo_index = gregdata->bpo_reloc_indexes[bpodata->bpo_index++]; 1187 1188 /* A consistency check: The value we now have in "relocation" must 1189 be the same as the value we stored for that relocation. It 1190 doesn't cost much, so can be left in at all times. */ 1191 if (value != gregdata->reloc_request[bpo_index].value) 1192 { 1193 (*_bfd_error_handler) 1194 (_("%s: Internal inconsistency error for value for\n\ 1195 linker-allocated global register: linked: 0x%lx%08lx != relaxed: 0x%lx%08lx\n"), 1196 bfd_get_filename (isec->owner), 1197 (unsigned long) (value >> 32), (unsigned long) value, 1198 (unsigned long) (gregdata->reloc_request[bpo_index].value 1199 >> 32), 1200 (unsigned long) gregdata->reloc_request[bpo_index].value); 1201 bfd_set_error (bfd_error_bad_value); 1202 return bfd_reloc_overflow; 1203 } 1204 1205 /* Then store the register number and offset for that register 1206 into datap and datap + 1 respectively. */ 1207 bfd_put_8 (abfd, 1208 gregdata->reloc_request[bpo_index].regindex 1209 + bpo_greg_section->output_section->vma / 8, 1210 datap); 1211 bfd_put_8 (abfd, 1212 gregdata->reloc_request[bpo_index].offset, 1213 ((unsigned char *) datap) + 1); 1214 return bfd_reloc_ok; 1215 } 1216 1217 case R_MMIX_REG_OR_BYTE: 1218 case R_MMIX_REG: 1219 if (value > 255) 1220 return bfd_reloc_overflow; 1221 bfd_put_8 (abfd, value, datap); 1222 return bfd_reloc_ok; 1223 1224 default: 1225 BAD_CASE (howto->type); 1226 } 1227 1228 /* This code adds the common SETL/INCML/INCMH/INCH worst-case 1229 sequence. */ 1230 1231 /* Lowest two bits must be 0. We return bfd_reloc_overflow for 1232 everything that looks strange. */ 1233 if (value & 3) 1234 flag = bfd_reloc_overflow; 1235 1236 bfd_put_32 (abfd, 1237 (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16), 1238 (bfd_byte *) datap + offs); 1239 bfd_put_32 (abfd, 1240 (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16), 1241 (bfd_byte *) datap + offs + 4); 1242 bfd_put_32 (abfd, 1243 (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16), 1244 (bfd_byte *) datap + offs + 8); 1245 bfd_put_32 (abfd, 1246 (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16), 1247 (bfd_byte *) datap + offs + 12); 1248 1249 return flag; 1250 } 1251 1252 /* Set the howto pointer for an MMIX ELF reloc (type RELA). */ 1253 1254 static void 1255 mmix_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, 1256 arelent *cache_ptr, 1257 Elf_Internal_Rela *dst) 1258 { 1259 unsigned int r_type; 1260 1261 r_type = ELF64_R_TYPE (dst->r_info); 1262 if (r_type >= (unsigned int) R_MMIX_max) 1263 { 1264 _bfd_error_handler (_("%B: invalid MMIX reloc number: %d"), abfd, r_type); 1265 r_type = 0; 1266 } 1267 cache_ptr->howto = &elf_mmix_howto_table[r_type]; 1268 } 1269 1270 /* Any MMIX-specific relocation gets here at assembly time or when linking 1271 to other formats (such as mmo); this is the relocation function from 1272 the reloc_table. We don't get here for final pure ELF linking. */ 1273 1274 static bfd_reloc_status_type 1275 mmix_elf_reloc (bfd *abfd, 1276 arelent *reloc_entry, 1277 asymbol *symbol, 1278 void * data, 1279 asection *input_section, 1280 bfd *output_bfd, 1281 char **error_message) 1282 { 1283 bfd_vma relocation; 1284 bfd_reloc_status_type r; 1285 asection *reloc_target_output_section; 1286 bfd_reloc_status_type flag = bfd_reloc_ok; 1287 bfd_vma output_base = 0; 1288 1289 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 1290 input_section, output_bfd, error_message); 1291 1292 /* If that was all that was needed (i.e. this isn't a final link, only 1293 some segment adjustments), we're done. */ 1294 if (r != bfd_reloc_continue) 1295 return r; 1296 1297 if (bfd_is_und_section (symbol->section) 1298 && (symbol->flags & BSF_WEAK) == 0 1299 && output_bfd == (bfd *) NULL) 1300 return bfd_reloc_undefined; 1301 1302 /* Is the address of the relocation really within the section? */ 1303 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 1304 return bfd_reloc_outofrange; 1305 1306 /* Work out which section the relocation is targeted at and the 1307 initial relocation command value. */ 1308 1309 /* Get symbol value. (Common symbols are special.) */ 1310 if (bfd_is_com_section (symbol->section)) 1311 relocation = 0; 1312 else 1313 relocation = symbol->value; 1314 1315 reloc_target_output_section = bfd_get_output_section (symbol); 1316 1317 /* Here the variable relocation holds the final address of the symbol we 1318 are relocating against, plus any addend. */ 1319 if (output_bfd) 1320 output_base = 0; 1321 else 1322 output_base = reloc_target_output_section->vma; 1323 1324 relocation += output_base + symbol->section->output_offset; 1325 1326 if (output_bfd != (bfd *) NULL) 1327 { 1328 /* Add in supplied addend. */ 1329 relocation += reloc_entry->addend; 1330 1331 /* This is a partial relocation, and we want to apply the 1332 relocation to the reloc entry rather than the raw data. 1333 Modify the reloc inplace to reflect what we now know. */ 1334 reloc_entry->addend = relocation; 1335 reloc_entry->address += input_section->output_offset; 1336 return flag; 1337 } 1338 1339 return mmix_final_link_relocate (reloc_entry->howto, input_section, 1340 data, reloc_entry->address, 1341 reloc_entry->addend, relocation, 1342 bfd_asymbol_name (symbol), 1343 reloc_target_output_section, 1344 error_message); 1345 } 1346 1347 /* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it 1349 for guidance if you're thinking of copying this. */ 1350 1351 static bfd_boolean 1352 mmix_elf_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, 1353 struct bfd_link_info *info, 1354 bfd *input_bfd, 1355 asection *input_section, 1356 bfd_byte *contents, 1357 Elf_Internal_Rela *relocs, 1358 Elf_Internal_Sym *local_syms, 1359 asection **local_sections) 1360 { 1361 Elf_Internal_Shdr *symtab_hdr; 1362 struct elf_link_hash_entry **sym_hashes; 1363 Elf_Internal_Rela *rel; 1364 Elf_Internal_Rela *relend; 1365 bfd_size_type size; 1366 size_t pjsno = 0; 1367 1368 size = input_section->rawsize ? input_section->rawsize : input_section->size; 1369 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1370 sym_hashes = elf_sym_hashes (input_bfd); 1371 relend = relocs + input_section->reloc_count; 1372 1373 /* Zero the stub area before we start. */ 1374 if (input_section->rawsize != 0 1375 && input_section->size > input_section->rawsize) 1376 memset (contents + input_section->rawsize, 0, 1377 input_section->size - input_section->rawsize); 1378 1379 for (rel = relocs; rel < relend; rel ++) 1380 { 1381 reloc_howto_type *howto; 1382 unsigned long r_symndx; 1383 Elf_Internal_Sym *sym; 1384 asection *sec; 1385 struct elf_link_hash_entry *h; 1386 bfd_vma relocation; 1387 bfd_reloc_status_type r; 1388 const char *name = NULL; 1389 int r_type; 1390 bfd_boolean undefined_signalled = FALSE; 1391 1392 r_type = ELF64_R_TYPE (rel->r_info); 1393 1394 if (r_type == R_MMIX_GNU_VTINHERIT 1395 || r_type == R_MMIX_GNU_VTENTRY) 1396 continue; 1397 1398 r_symndx = ELF64_R_SYM (rel->r_info); 1399 1400 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info); 1401 h = NULL; 1402 sym = NULL; 1403 sec = NULL; 1404 1405 if (r_symndx < symtab_hdr->sh_info) 1406 { 1407 sym = local_syms + r_symndx; 1408 sec = local_sections [r_symndx]; 1409 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1410 1411 name = bfd_elf_string_from_elf_section (input_bfd, 1412 symtab_hdr->sh_link, 1413 sym->st_name); 1414 if (name == NULL) 1415 name = bfd_section_name (input_bfd, sec); 1416 } 1417 else 1418 { 1419 bfd_boolean unresolved_reloc, ignored; 1420 1421 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1422 r_symndx, symtab_hdr, sym_hashes, 1423 h, sec, relocation, 1424 unresolved_reloc, undefined_signalled, 1425 ignored); 1426 name = h->root.root.string; 1427 } 1428 1429 if (sec != NULL && discarded_section (sec)) 1430 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1431 rel, 1, relend, howto, 0, contents); 1432 1433 if (bfd_link_relocatable (info)) 1434 { 1435 /* This is a relocatable link. For most relocs we don't have to 1436 change anything, unless the reloc is against a section 1437 symbol, in which case we have to adjust according to where 1438 the section symbol winds up in the output section. */ 1439 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 1440 rel->r_addend += sec->output_offset; 1441 1442 /* For PUSHJ stub relocs however, we may need to change the 1443 reloc and the section contents, if the reloc doesn't reach 1444 beyond the end of the output section and previous stubs. 1445 Then we change the section contents to be a PUSHJ to the end 1446 of the input section plus stubs (we can do that without using 1447 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ 1448 at the stub location. */ 1449 if (r_type == R_MMIX_PUSHJ_STUBBABLE) 1450 { 1451 /* We've already checked whether we need a stub; use that 1452 knowledge. */ 1453 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno] 1454 != 0) 1455 { 1456 Elf_Internal_Rela relcpy; 1457 1458 if (mmix_elf_section_data (input_section) 1459 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE) 1460 abort (); 1461 1462 /* There's already a PUSHJ insn there, so just fill in 1463 the offset bits to the stub. */ 1464 if (mmix_final_link_relocate (elf_mmix_howto_table 1465 + R_MMIX_ADDR19, 1466 input_section, 1467 contents, 1468 rel->r_offset, 1469 0, 1470 input_section 1471 ->output_section->vma 1472 + input_section->output_offset 1473 + size 1474 + mmix_elf_section_data (input_section) 1475 ->pjs.stub_offset, 1476 NULL, NULL, NULL) != bfd_reloc_ok) 1477 return FALSE; 1478 1479 /* Put a JMP insn at the stub; it goes with the 1480 R_MMIX_JMP reloc. */ 1481 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24, 1482 contents 1483 + size 1484 + mmix_elf_section_data (input_section) 1485 ->pjs.stub_offset); 1486 1487 /* Change the reloc to be at the stub, and to a full 1488 R_MMIX_JMP reloc. */ 1489 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP); 1490 rel->r_offset 1491 = (size 1492 + mmix_elf_section_data (input_section) 1493 ->pjs.stub_offset); 1494 1495 mmix_elf_section_data (input_section)->pjs.stub_offset 1496 += MAX_PUSHJ_STUB_SIZE; 1497 1498 /* Shift this reloc to the end of the relocs to maintain 1499 the r_offset sorted reloc order. */ 1500 relcpy = *rel; 1501 memmove (rel, rel + 1, (char *) relend - (char *) rel); 1502 relend[-1] = relcpy; 1503 1504 /* Back up one reloc, or else we'd skip the next reloc 1505 in turn. */ 1506 rel--; 1507 } 1508 1509 pjsno++; 1510 } 1511 continue; 1512 } 1513 1514 r = mmix_final_link_relocate (howto, input_section, 1515 contents, rel->r_offset, 1516 rel->r_addend, relocation, name, sec, NULL); 1517 1518 if (r != bfd_reloc_ok) 1519 { 1520 bfd_boolean check_ok = TRUE; 1521 const char * msg = (const char *) NULL; 1522 1523 switch (r) 1524 { 1525 case bfd_reloc_overflow: 1526 check_ok = info->callbacks->reloc_overflow 1527 (info, (h ? &h->root : NULL), name, howto->name, 1528 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1529 break; 1530 1531 case bfd_reloc_undefined: 1532 /* We may have sent this message above. */ 1533 if (! undefined_signalled) 1534 check_ok = info->callbacks->undefined_symbol 1535 (info, name, input_bfd, input_section, rel->r_offset, 1536 TRUE); 1537 undefined_signalled = TRUE; 1538 break; 1539 1540 case bfd_reloc_outofrange: 1541 msg = _("internal error: out of range error"); 1542 break; 1543 1544 case bfd_reloc_notsupported: 1545 msg = _("internal error: unsupported relocation error"); 1546 break; 1547 1548 case bfd_reloc_dangerous: 1549 msg = _("internal error: dangerous relocation"); 1550 break; 1551 1552 default: 1553 msg = _("internal error: unknown error"); 1554 break; 1555 } 1556 1557 if (msg) 1558 check_ok = info->callbacks->warning 1559 (info, msg, name, input_bfd, input_section, rel->r_offset); 1560 1561 if (! check_ok) 1562 return FALSE; 1563 } 1564 } 1565 1566 return TRUE; 1567 } 1568 1569 /* Perform a single relocation. By default we use the standard BFD 1571 routines. A few relocs we have to do ourselves. */ 1572 1573 static bfd_reloc_status_type 1574 mmix_final_link_relocate (reloc_howto_type *howto, asection *input_section, 1575 bfd_byte *contents, bfd_vma r_offset, 1576 bfd_signed_vma r_addend, bfd_vma relocation, 1577 const char *symname, asection *symsec, 1578 char **error_message) 1579 { 1580 bfd_reloc_status_type r = bfd_reloc_ok; 1581 bfd_vma addr 1582 = (input_section->output_section->vma 1583 + input_section->output_offset 1584 + r_offset); 1585 bfd_signed_vma srel 1586 = (bfd_signed_vma) relocation + r_addend; 1587 1588 switch (howto->type) 1589 { 1590 /* All these are PC-relative. */ 1591 case R_MMIX_PUSHJ_STUBBABLE: 1592 case R_MMIX_PUSHJ: 1593 case R_MMIX_CBRANCH: 1594 case R_MMIX_ADDR19: 1595 case R_MMIX_GETA: 1596 case R_MMIX_ADDR27: 1597 case R_MMIX_JMP: 1598 contents += r_offset; 1599 1600 srel -= (input_section->output_section->vma 1601 + input_section->output_offset 1602 + r_offset); 1603 1604 r = mmix_elf_perform_relocation (input_section, howto, contents, 1605 addr, srel, error_message); 1606 break; 1607 1608 case R_MMIX_BASE_PLUS_OFFSET: 1609 if (symsec == NULL) 1610 return bfd_reloc_undefined; 1611 1612 /* Check that we're not relocating against a register symbol. */ 1613 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1614 MMIX_REG_CONTENTS_SECTION_NAME) == 0 1615 || strcmp (bfd_get_section_name (symsec->owner, symsec), 1616 MMIX_REG_SECTION_NAME) == 0) 1617 { 1618 /* Note: This is separated out into two messages in order 1619 to ease the translation into other languages. */ 1620 if (symname == NULL || *symname == 0) 1621 (*_bfd_error_handler) 1622 (_("%s: base-plus-offset relocation against register symbol: (unknown) in %s"), 1623 bfd_get_filename (input_section->owner), 1624 bfd_get_section_name (symsec->owner, symsec)); 1625 else 1626 (*_bfd_error_handler) 1627 (_("%s: base-plus-offset relocation against register symbol: %s in %s"), 1628 bfd_get_filename (input_section->owner), symname, 1629 bfd_get_section_name (symsec->owner, symsec)); 1630 return bfd_reloc_overflow; 1631 } 1632 goto do_mmix_reloc; 1633 1634 case R_MMIX_REG_OR_BYTE: 1635 case R_MMIX_REG: 1636 /* For now, we handle these alike. They must refer to an register 1637 symbol, which is either relative to the register section and in 1638 the range 0..255, or is in the register contents section with vma 1639 regno * 8. */ 1640 1641 /* FIXME: A better way to check for reg contents section? 1642 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */ 1643 if (symsec == NULL) 1644 return bfd_reloc_undefined; 1645 1646 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1647 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1648 { 1649 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1650 { 1651 /* The bfd_reloc_outofrange return value, though intuitively 1652 a better value, will not get us an error. */ 1653 return bfd_reloc_overflow; 1654 } 1655 srel /= 8; 1656 } 1657 else if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1658 MMIX_REG_SECTION_NAME) == 0) 1659 { 1660 if (srel < 0 || srel > 255) 1661 /* The bfd_reloc_outofrange return value, though intuitively a 1662 better value, will not get us an error. */ 1663 return bfd_reloc_overflow; 1664 } 1665 else 1666 { 1667 /* Note: This is separated out into two messages in order 1668 to ease the translation into other languages. */ 1669 if (symname == NULL || *symname == 0) 1670 (*_bfd_error_handler) 1671 (_("%s: register relocation against non-register symbol: (unknown) in %s"), 1672 bfd_get_filename (input_section->owner), 1673 bfd_get_section_name (symsec->owner, symsec)); 1674 else 1675 (*_bfd_error_handler) 1676 (_("%s: register relocation against non-register symbol: %s in %s"), 1677 bfd_get_filename (input_section->owner), symname, 1678 bfd_get_section_name (symsec->owner, symsec)); 1679 1680 /* The bfd_reloc_outofrange return value, though intuitively a 1681 better value, will not get us an error. */ 1682 return bfd_reloc_overflow; 1683 } 1684 do_mmix_reloc: 1685 contents += r_offset; 1686 r = mmix_elf_perform_relocation (input_section, howto, contents, 1687 addr, srel, error_message); 1688 break; 1689 1690 case R_MMIX_LOCAL: 1691 /* This isn't a real relocation, it's just an assertion that the 1692 final relocation value corresponds to a local register. We 1693 ignore the actual relocation; nothing is changed. */ 1694 { 1695 asection *regsec 1696 = bfd_get_section_by_name (input_section->output_section->owner, 1697 MMIX_REG_CONTENTS_SECTION_NAME); 1698 bfd_vma first_global; 1699 1700 /* Check that this is an absolute value, or a reference to the 1701 register contents section or the register (symbol) section. 1702 Absolute numbers can get here as undefined section. Undefined 1703 symbols are signalled elsewhere, so there's no conflict in us 1704 accidentally handling it. */ 1705 if (!bfd_is_abs_section (symsec) 1706 && !bfd_is_und_section (symsec) 1707 && strcmp (bfd_get_section_name (symsec->owner, symsec), 1708 MMIX_REG_CONTENTS_SECTION_NAME) != 0 1709 && strcmp (bfd_get_section_name (symsec->owner, symsec), 1710 MMIX_REG_SECTION_NAME) != 0) 1711 { 1712 (*_bfd_error_handler) 1713 (_("%s: directive LOCAL valid only with a register or absolute value"), 1714 bfd_get_filename (input_section->owner)); 1715 1716 return bfd_reloc_overflow; 1717 } 1718 1719 /* If we don't have a register contents section, then $255 is the 1720 first global register. */ 1721 if (regsec == NULL) 1722 first_global = 255; 1723 else 1724 { 1725 first_global 1726 = bfd_get_section_vma (input_section->output_section->owner, 1727 regsec) / 8; 1728 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1729 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1730 { 1731 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1732 /* The bfd_reloc_outofrange return value, though 1733 intuitively a better value, will not get us an error. */ 1734 return bfd_reloc_overflow; 1735 srel /= 8; 1736 } 1737 } 1738 1739 if ((bfd_vma) srel >= first_global) 1740 { 1741 /* FIXME: Better error message. */ 1742 (*_bfd_error_handler) 1743 (_("%s: LOCAL directive: Register $%ld is not a local register. First global register is $%ld."), 1744 bfd_get_filename (input_section->owner), (long) srel, (long) first_global); 1745 1746 return bfd_reloc_overflow; 1747 } 1748 } 1749 r = bfd_reloc_ok; 1750 break; 1751 1752 default: 1753 r = _bfd_final_link_relocate (howto, input_section->owner, input_section, 1754 contents, r_offset, 1755 relocation, r_addend); 1756 } 1757 1758 return r; 1759 } 1760 1761 /* Return the section that should be marked against GC for a given 1763 relocation. */ 1764 1765 static asection * 1766 mmix_elf_gc_mark_hook (asection *sec, 1767 struct bfd_link_info *info, 1768 Elf_Internal_Rela *rel, 1769 struct elf_link_hash_entry *h, 1770 Elf_Internal_Sym *sym) 1771 { 1772 if (h != NULL) 1773 switch (ELF64_R_TYPE (rel->r_info)) 1774 { 1775 case R_MMIX_GNU_VTINHERIT: 1776 case R_MMIX_GNU_VTENTRY: 1777 return NULL; 1778 } 1779 1780 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1781 } 1782 1783 /* Update relocation info for a GC-excluded section. We could supposedly 1784 perform the allocation after GC, but there's no suitable hook between 1785 GC (or section merge) and the point when all input sections must be 1786 present. Better to waste some memory and (perhaps) a little time. */ 1787 1788 static bfd_boolean 1789 mmix_elf_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, 1790 struct bfd_link_info *info ATTRIBUTE_UNUSED, 1791 asection *sec, 1792 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) 1793 { 1794 struct bpo_reloc_section_info *bpodata 1795 = mmix_elf_section_data (sec)->bpo.reloc; 1796 asection *allocated_gregs_section; 1797 1798 /* If no bpodata here, we have nothing to do. */ 1799 if (bpodata == NULL) 1800 return TRUE; 1801 1802 allocated_gregs_section = bpodata->bpo_greg_section; 1803 1804 mmix_elf_section_data (allocated_gregs_section)->bpo.greg->n_bpo_relocs 1805 -= bpodata->n_bpo_relocs_this_section; 1806 1807 return TRUE; 1808 } 1809 1810 /* Sort register relocs to come before expanding relocs. */ 1812 1813 static int 1814 mmix_elf_sort_relocs (const void * p1, const void * p2) 1815 { 1816 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1; 1817 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2; 1818 int r1_is_reg, r2_is_reg; 1819 1820 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive 1821 insns. */ 1822 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3)) 1823 return 1; 1824 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3)) 1825 return -1; 1826 1827 r1_is_reg 1828 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE 1829 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG); 1830 r2_is_reg 1831 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE 1832 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG); 1833 if (r1_is_reg != r2_is_reg) 1834 return r2_is_reg - r1_is_reg; 1835 1836 /* Neither or both are register relocs. Then sort on full offset. */ 1837 if (r1->r_offset > r2->r_offset) 1838 return 1; 1839 else if (r1->r_offset < r2->r_offset) 1840 return -1; 1841 return 0; 1842 } 1843 1844 /* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */ 1845 1846 static bfd_boolean 1847 mmix_elf_check_common_relocs (bfd *abfd, 1848 struct bfd_link_info *info, 1849 asection *sec, 1850 const Elf_Internal_Rela *relocs) 1851 { 1852 bfd *bpo_greg_owner = NULL; 1853 asection *allocated_gregs_section = NULL; 1854 struct bpo_greg_section_info *gregdata = NULL; 1855 struct bpo_reloc_section_info *bpodata = NULL; 1856 const Elf_Internal_Rela *rel; 1857 const Elf_Internal_Rela *rel_end; 1858 1859 /* We currently have to abuse this COFF-specific member, since there's 1860 no target-machine-dedicated member. There's no alternative outside 1861 the bfd_link_info struct; we can't specialize a hash-table since 1862 they're different between ELF and mmo. */ 1863 bpo_greg_owner = (bfd *) info->base_file; 1864 1865 rel_end = relocs + sec->reloc_count; 1866 for (rel = relocs; rel < rel_end; rel++) 1867 { 1868 switch (ELF64_R_TYPE (rel->r_info)) 1869 { 1870 /* This relocation causes a GREG allocation. We need to count 1871 them, and we need to create a section for them, so we need an 1872 object to fake as the owner of that section. We can't use 1873 the ELF dynobj for this, since the ELF bits assume lots of 1874 DSO-related stuff if that member is non-NULL. */ 1875 case R_MMIX_BASE_PLUS_OFFSET: 1876 /* We don't do anything with this reloc for a relocatable link. */ 1877 if (bfd_link_relocatable (info)) 1878 break; 1879 1880 if (bpo_greg_owner == NULL) 1881 { 1882 bpo_greg_owner = abfd; 1883 info->base_file = bpo_greg_owner; 1884 } 1885 1886 if (allocated_gregs_section == NULL) 1887 allocated_gregs_section 1888 = bfd_get_section_by_name (bpo_greg_owner, 1889 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 1890 1891 if (allocated_gregs_section == NULL) 1892 { 1893 allocated_gregs_section 1894 = bfd_make_section_with_flags (bpo_greg_owner, 1895 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME, 1896 (SEC_HAS_CONTENTS 1897 | SEC_IN_MEMORY 1898 | SEC_LINKER_CREATED)); 1899 /* Setting both SEC_ALLOC and SEC_LOAD means the section is 1900 treated like any other section, and we'd get errors for 1901 address overlap with the text section. Let's set none of 1902 those flags, as that is what currently happens for usual 1903 GREG allocations, and that works. */ 1904 if (allocated_gregs_section == NULL 1905 || !bfd_set_section_alignment (bpo_greg_owner, 1906 allocated_gregs_section, 1907 3)) 1908 return FALSE; 1909 1910 gregdata = (struct bpo_greg_section_info *) 1911 bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info)); 1912 if (gregdata == NULL) 1913 return FALSE; 1914 mmix_elf_section_data (allocated_gregs_section)->bpo.greg 1915 = gregdata; 1916 } 1917 else if (gregdata == NULL) 1918 gregdata 1919 = mmix_elf_section_data (allocated_gregs_section)->bpo.greg; 1920 1921 /* Get ourselves some auxiliary info for the BPO-relocs. */ 1922 if (bpodata == NULL) 1923 { 1924 /* No use doing a separate iteration pass to find the upper 1925 limit - just use the number of relocs. */ 1926 bpodata = (struct bpo_reloc_section_info *) 1927 bfd_alloc (bpo_greg_owner, 1928 sizeof (struct bpo_reloc_section_info) 1929 * (sec->reloc_count + 1)); 1930 if (bpodata == NULL) 1931 return FALSE; 1932 mmix_elf_section_data (sec)->bpo.reloc = bpodata; 1933 bpodata->first_base_plus_offset_reloc 1934 = bpodata->bpo_index 1935 = gregdata->n_max_bpo_relocs; 1936 bpodata->bpo_greg_section 1937 = allocated_gregs_section; 1938 bpodata->n_bpo_relocs_this_section = 0; 1939 } 1940 1941 bpodata->n_bpo_relocs_this_section++; 1942 gregdata->n_max_bpo_relocs++; 1943 1944 /* We don't get another chance to set this before GC; we've not 1945 set up any hook that runs before GC. */ 1946 gregdata->n_bpo_relocs 1947 = gregdata->n_max_bpo_relocs; 1948 break; 1949 1950 case R_MMIX_PUSHJ_STUBBABLE: 1951 mmix_elf_section_data (sec)->pjs.n_pushj_relocs++; 1952 break; 1953 } 1954 } 1955 1956 /* Allocate per-reloc stub storage and initialize it to the max stub 1957 size. */ 1958 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0) 1959 { 1960 size_t i; 1961 1962 mmix_elf_section_data (sec)->pjs.stub_size 1963 = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs 1964 * sizeof (mmix_elf_section_data (sec) 1965 ->pjs.stub_size[0])); 1966 if (mmix_elf_section_data (sec)->pjs.stub_size == NULL) 1967 return FALSE; 1968 1969 for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++) 1970 mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE; 1971 } 1972 1973 return TRUE; 1974 } 1975 1976 /* Look through the relocs for a section during the first phase. */ 1977 1978 static bfd_boolean 1979 mmix_elf_check_relocs (bfd *abfd, 1980 struct bfd_link_info *info, 1981 asection *sec, 1982 const Elf_Internal_Rela *relocs) 1983 { 1984 Elf_Internal_Shdr *symtab_hdr; 1985 struct elf_link_hash_entry **sym_hashes; 1986 const Elf_Internal_Rela *rel; 1987 const Elf_Internal_Rela *rel_end; 1988 1989 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1990 sym_hashes = elf_sym_hashes (abfd); 1991 1992 /* First we sort the relocs so that any register relocs come before 1993 expansion-relocs to the same insn. FIXME: Not done for mmo. */ 1994 qsort ((void *) relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), 1995 mmix_elf_sort_relocs); 1996 1997 /* Do the common part. */ 1998 if (!mmix_elf_check_common_relocs (abfd, info, sec, relocs)) 1999 return FALSE; 2000 2001 if (bfd_link_relocatable (info)) 2002 return TRUE; 2003 2004 rel_end = relocs + sec->reloc_count; 2005 for (rel = relocs; rel < rel_end; rel++) 2006 { 2007 struct elf_link_hash_entry *h; 2008 unsigned long r_symndx; 2009 2010 r_symndx = ELF64_R_SYM (rel->r_info); 2011 if (r_symndx < symtab_hdr->sh_info) 2012 h = NULL; 2013 else 2014 { 2015 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 2016 while (h->root.type == bfd_link_hash_indirect 2017 || h->root.type == bfd_link_hash_warning) 2018 h = (struct elf_link_hash_entry *) h->root.u.i.link; 2019 2020 /* PR15323, ref flags aren't set for references in the same 2021 object. */ 2022 h->root.non_ir_ref = 1; 2023 } 2024 2025 switch (ELF64_R_TYPE (rel->r_info)) 2026 { 2027 /* This relocation describes the C++ object vtable hierarchy. 2028 Reconstruct it for later use during GC. */ 2029 case R_MMIX_GNU_VTINHERIT: 2030 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2031 return FALSE; 2032 break; 2033 2034 /* This relocation describes which C++ vtable entries are actually 2035 used. Record for later use during GC. */ 2036 case R_MMIX_GNU_VTENTRY: 2037 BFD_ASSERT (h != NULL); 2038 if (h != NULL 2039 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2040 return FALSE; 2041 break; 2042 } 2043 } 2044 2045 return TRUE; 2046 } 2047 2048 /* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo. 2049 Copied from elf_link_add_object_symbols. */ 2050 2051 bfd_boolean 2052 _bfd_mmix_check_all_relocs (bfd *abfd, struct bfd_link_info *info) 2053 { 2054 asection *o; 2055 2056 for (o = abfd->sections; o != NULL; o = o->next) 2057 { 2058 Elf_Internal_Rela *internal_relocs; 2059 bfd_boolean ok; 2060 2061 if ((o->flags & SEC_RELOC) == 0 2062 || o->reloc_count == 0 2063 || ((info->strip == strip_all || info->strip == strip_debugger) 2064 && (o->flags & SEC_DEBUGGING) != 0) 2065 || bfd_is_abs_section (o->output_section)) 2066 continue; 2067 2068 internal_relocs 2069 = _bfd_elf_link_read_relocs (abfd, o, NULL, 2070 (Elf_Internal_Rela *) NULL, 2071 info->keep_memory); 2072 if (internal_relocs == NULL) 2073 return FALSE; 2074 2075 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs); 2076 2077 if (! info->keep_memory) 2078 free (internal_relocs); 2079 2080 if (! ok) 2081 return FALSE; 2082 } 2083 2084 return TRUE; 2085 } 2086 2087 /* Change symbols relative to the reg contents section to instead be to 2089 the register section, and scale them down to correspond to the register 2090 number. */ 2091 2092 static int 2093 mmix_elf_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED, 2094 const char *name ATTRIBUTE_UNUSED, 2095 Elf_Internal_Sym *sym, 2096 asection *input_sec, 2097 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) 2098 { 2099 if (input_sec != NULL 2100 && input_sec->name != NULL 2101 && ELF_ST_TYPE (sym->st_info) != STT_SECTION 2102 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0) 2103 { 2104 sym->st_value /= 8; 2105 sym->st_shndx = SHN_REGISTER; 2106 } 2107 2108 return 1; 2109 } 2110 2111 /* We fake a register section that holds values that are register numbers. 2112 Having a SHN_REGISTER and register section translates better to other 2113 formats (e.g. mmo) than for example a STT_REGISTER attribute. 2114 This section faking is based on a construct in elf32-mips.c. */ 2115 static asection mmix_elf_reg_section; 2116 static asymbol mmix_elf_reg_section_symbol; 2117 static asymbol *mmix_elf_reg_section_symbol_ptr; 2118 2119 /* Handle the special section numbers that a symbol may use. */ 2120 2121 void 2122 mmix_elf_symbol_processing (abfd, asym) 2123 bfd *abfd ATTRIBUTE_UNUSED; 2124 asymbol *asym; 2125 { 2126 elf_symbol_type *elfsym; 2127 2128 elfsym = (elf_symbol_type *) asym; 2129 switch (elfsym->internal_elf_sym.st_shndx) 2130 { 2131 case SHN_REGISTER: 2132 if (mmix_elf_reg_section.name == NULL) 2133 { 2134 /* Initialize the register section. */ 2135 mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME; 2136 mmix_elf_reg_section.flags = SEC_NO_FLAGS; 2137 mmix_elf_reg_section.output_section = &mmix_elf_reg_section; 2138 mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol; 2139 mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr; 2140 mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME; 2141 mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM; 2142 mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section; 2143 mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol; 2144 } 2145 asym->section = &mmix_elf_reg_section; 2146 break; 2147 2148 default: 2149 break; 2150 } 2151 } 2152 2153 /* Given a BFD section, try to locate the corresponding ELF section 2154 index. */ 2155 2156 static bfd_boolean 2157 mmix_elf_section_from_bfd_section (bfd * abfd ATTRIBUTE_UNUSED, 2158 asection * sec, 2159 int * retval) 2160 { 2161 if (strcmp (bfd_get_section_name (abfd, sec), MMIX_REG_SECTION_NAME) == 0) 2162 *retval = SHN_REGISTER; 2163 else 2164 return FALSE; 2165 2166 return TRUE; 2167 } 2168 2169 /* Hook called by the linker routine which adds symbols from an object 2170 file. We must handle the special SHN_REGISTER section number here. 2171 2172 We also check that we only have *one* each of the section-start 2173 symbols, since otherwise having two with the same value would cause 2174 them to be "merged", but with the contents serialized. */ 2175 2176 static bfd_boolean 2177 mmix_elf_add_symbol_hook (bfd *abfd, 2178 struct bfd_link_info *info ATTRIBUTE_UNUSED, 2179 Elf_Internal_Sym *sym, 2180 const char **namep ATTRIBUTE_UNUSED, 2181 flagword *flagsp ATTRIBUTE_UNUSED, 2182 asection **secp, 2183 bfd_vma *valp ATTRIBUTE_UNUSED) 2184 { 2185 if (sym->st_shndx == SHN_REGISTER) 2186 { 2187 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME); 2188 (*secp)->flags |= SEC_LINKER_CREATED; 2189 } 2190 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.' 2191 && CONST_STRNEQ (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) 2192 { 2193 /* See if we have another one. */ 2194 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash, 2195 *namep, 2196 FALSE, 2197 FALSE, 2198 FALSE); 2199 2200 if (h != NULL && h->type != bfd_link_hash_undefined) 2201 { 2202 /* How do we get the asymbol (or really: the filename) from h? 2203 h->u.def.section->owner is NULL. */ 2204 ((*_bfd_error_handler) 2205 (_("%s: Error: multiple definition of `%s'; start of %s is set in a earlier linked file\n"), 2206 bfd_get_filename (abfd), *namep, 2207 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX))); 2208 bfd_set_error (bfd_error_bad_value); 2209 return FALSE; 2210 } 2211 } 2212 2213 return TRUE; 2214 } 2215 2216 /* We consider symbols matching "L.*:[0-9]+" to be local symbols. */ 2217 2218 static bfd_boolean 2219 mmix_elf_is_local_label_name (bfd *abfd, const char *name) 2220 { 2221 const char *colpos; 2222 int digits; 2223 2224 /* Also include the default local-label definition. */ 2225 if (_bfd_elf_is_local_label_name (abfd, name)) 2226 return TRUE; 2227 2228 if (*name != 'L') 2229 return FALSE; 2230 2231 /* If there's no ":", or more than one, it's not a local symbol. */ 2232 colpos = strchr (name, ':'); 2233 if (colpos == NULL || strchr (colpos + 1, ':') != NULL) 2234 return FALSE; 2235 2236 /* Check that there are remaining characters and that they are digits. */ 2237 if (colpos[1] == 0) 2238 return FALSE; 2239 2240 digits = strspn (colpos + 1, "0123456789"); 2241 return digits != 0 && colpos[1 + digits] == 0; 2242 } 2243 2244 /* We get rid of the register section here. */ 2245 2246 bfd_boolean 2247 mmix_elf_final_link (bfd *abfd, struct bfd_link_info *info) 2248 { 2249 /* We never output a register section, though we create one for 2250 temporary measures. Check that nobody entered contents into it. */ 2251 asection *reg_section; 2252 2253 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME); 2254 2255 if (reg_section != NULL) 2256 { 2257 /* FIXME: Pass error state gracefully. */ 2258 if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS) 2259 _bfd_abort (__FILE__, __LINE__, _("Register section has contents\n")); 2260 2261 /* Really remove the section, if it hasn't already been done. */ 2262 if (!bfd_section_removed_from_list (abfd, reg_section)) 2263 { 2264 bfd_section_list_remove (abfd, reg_section); 2265 --abfd->section_count; 2266 } 2267 } 2268 2269 if (! bfd_elf_final_link (abfd, info)) 2270 return FALSE; 2271 2272 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by 2273 the regular linker machinery. We do it here, like other targets with 2274 special sections. */ 2275 if (info->base_file != NULL) 2276 { 2277 asection *greg_section 2278 = bfd_get_section_by_name ((bfd *) info->base_file, 2279 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2280 if (!bfd_set_section_contents (abfd, 2281 greg_section->output_section, 2282 greg_section->contents, 2283 (file_ptr) greg_section->output_offset, 2284 greg_section->size)) 2285 return FALSE; 2286 } 2287 return TRUE; 2288 } 2289 2290 /* We need to include the maximum size of PUSHJ-stubs in the initial 2291 section size. This is expected to shrink during linker relaxation. */ 2292 2293 static void 2294 mmix_set_relaxable_size (bfd *abfd ATTRIBUTE_UNUSED, 2295 asection *sec, 2296 void *ptr) 2297 { 2298 struct bfd_link_info *info = ptr; 2299 2300 /* Make sure we only do this for section where we know we want this, 2301 otherwise we might end up resetting the size of COMMONs. */ 2302 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0) 2303 return; 2304 2305 sec->rawsize = sec->size; 2306 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2307 * MAX_PUSHJ_STUB_SIZE); 2308 2309 /* For use in relocatable link, we start with a max stubs size. See 2310 mmix_elf_relax_section. */ 2311 if (bfd_link_relocatable (info) && sec->output_section) 2312 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum 2313 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2314 * MAX_PUSHJ_STUB_SIZE); 2315 } 2316 2317 /* Initialize stuff for the linker-generated GREGs to match 2318 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */ 2319 2320 bfd_boolean 2321 _bfd_mmix_before_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2322 struct bfd_link_info *info) 2323 { 2324 asection *bpo_gregs_section; 2325 bfd *bpo_greg_owner; 2326 struct bpo_greg_section_info *gregdata; 2327 size_t n_gregs; 2328 bfd_vma gregs_size; 2329 size_t i; 2330 size_t *bpo_reloc_indexes; 2331 bfd *ibfd; 2332 2333 /* Set the initial size of sections. */ 2334 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 2335 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info); 2336 2337 /* The bpo_greg_owner bfd is supposed to have been set by 2338 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen. 2339 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2340 bpo_greg_owner = (bfd *) info->base_file; 2341 if (bpo_greg_owner == NULL) 2342 return TRUE; 2343 2344 bpo_gregs_section 2345 = bfd_get_section_by_name (bpo_greg_owner, 2346 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2347 2348 if (bpo_gregs_section == NULL) 2349 return TRUE; 2350 2351 /* We use the target-data handle in the ELF section data. */ 2352 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2353 if (gregdata == NULL) 2354 return FALSE; 2355 2356 n_gregs = gregdata->n_bpo_relocs; 2357 gregdata->n_allocated_bpo_gregs = n_gregs; 2358 2359 /* When this reaches zero during relaxation, all entries have been 2360 filled in and the size of the linker gregs can be calculated. */ 2361 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs; 2362 2363 /* Set the zeroth-order estimate for the GREGs size. */ 2364 gregs_size = n_gregs * 8; 2365 2366 if (!bfd_set_section_size (bpo_greg_owner, bpo_gregs_section, gregs_size)) 2367 return FALSE; 2368 2369 /* Allocate and set up the GREG arrays. They're filled in at relaxation 2370 time. Note that we must use the max number ever noted for the array, 2371 since the index numbers were created before GC. */ 2372 gregdata->reloc_request 2373 = bfd_zalloc (bpo_greg_owner, 2374 sizeof (struct bpo_reloc_request) 2375 * gregdata->n_max_bpo_relocs); 2376 2377 gregdata->bpo_reloc_indexes 2378 = bpo_reloc_indexes 2379 = bfd_alloc (bpo_greg_owner, 2380 gregdata->n_max_bpo_relocs 2381 * sizeof (size_t)); 2382 if (bpo_reloc_indexes == NULL) 2383 return FALSE; 2384 2385 /* The default order is an identity mapping. */ 2386 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2387 { 2388 bpo_reloc_indexes[i] = i; 2389 gregdata->reloc_request[i].bpo_reloc_no = i; 2390 } 2391 2392 return TRUE; 2393 } 2394 2395 /* Fill in contents in the linker allocated gregs. Everything is 2397 calculated at this point; we just move the contents into place here. */ 2398 2399 bfd_boolean 2400 _bfd_mmix_after_linker_allocation (bfd *abfd ATTRIBUTE_UNUSED, 2401 struct bfd_link_info *link_info) 2402 { 2403 asection *bpo_gregs_section; 2404 bfd *bpo_greg_owner; 2405 struct bpo_greg_section_info *gregdata; 2406 size_t n_gregs; 2407 size_t i, j; 2408 size_t lastreg; 2409 bfd_byte *contents; 2410 2411 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs 2412 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such 2413 object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2414 bpo_greg_owner = (bfd *) link_info->base_file; 2415 if (bpo_greg_owner == NULL) 2416 return TRUE; 2417 2418 bpo_gregs_section 2419 = bfd_get_section_by_name (bpo_greg_owner, 2420 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2421 2422 /* This can't happen without DSO handling. When DSOs are handled 2423 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such 2424 section. */ 2425 if (bpo_gregs_section == NULL) 2426 return TRUE; 2427 2428 /* We use the target-data handle in the ELF section data. */ 2429 2430 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2431 if (gregdata == NULL) 2432 return FALSE; 2433 2434 n_gregs = gregdata->n_allocated_bpo_gregs; 2435 2436 bpo_gregs_section->contents 2437 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size); 2438 if (contents == NULL) 2439 return FALSE; 2440 2441 /* Sanity check: If these numbers mismatch, some relocation has not been 2442 accounted for and the rest of gregdata is probably inconsistent. 2443 It's a bug, but it's more helpful to identify it than segfaulting 2444 below. */ 2445 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round 2446 != gregdata->n_bpo_relocs) 2447 { 2448 (*_bfd_error_handler) 2449 (_("Internal inconsistency: remaining %u != max %u.\n\ 2450 Please report this bug."), 2451 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2452 gregdata->n_bpo_relocs); 2453 return FALSE; 2454 } 2455 2456 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++) 2457 if (gregdata->reloc_request[i].regindex != lastreg) 2458 { 2459 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value, 2460 contents + j * 8); 2461 lastreg = gregdata->reloc_request[i].regindex; 2462 j++; 2463 } 2464 2465 return TRUE; 2466 } 2467 2468 /* Sort valid relocs to come before non-valid relocs, then on increasing 2469 value. */ 2470 2471 static int 2472 bpo_reloc_request_sort_fn (const void * p1, const void * p2) 2473 { 2474 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1; 2475 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2; 2476 2477 /* Primary function is validity; non-valid relocs sorted after valid 2478 ones. */ 2479 if (r1->valid != r2->valid) 2480 return r2->valid - r1->valid; 2481 2482 /* Then sort on value. Don't simplify and return just the difference of 2483 the values: the upper bits of the 64-bit value would be truncated on 2484 a host with 32-bit ints. */ 2485 if (r1->value != r2->value) 2486 return r1->value > r2->value ? 1 : -1; 2487 2488 /* As a last re-sort, use the relocation number, so we get a stable 2489 sort. The *addresses* aren't stable since items are swapped during 2490 sorting. It depends on the qsort implementation if this actually 2491 happens. */ 2492 return r1->bpo_reloc_no > r2->bpo_reloc_no 2493 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0); 2494 } 2495 2496 /* For debug use only. Dumps the global register allocations resulting 2497 from base-plus-offset relocs. */ 2498 2499 void 2500 mmix_dump_bpo_gregs (link_info, pf) 2501 struct bfd_link_info *link_info; 2502 bfd_error_handler_type pf; 2503 { 2504 bfd *bpo_greg_owner; 2505 asection *bpo_gregs_section; 2506 struct bpo_greg_section_info *gregdata; 2507 unsigned int i; 2508 2509 if (link_info == NULL || link_info->base_file == NULL) 2510 return; 2511 2512 bpo_greg_owner = (bfd *) link_info->base_file; 2513 2514 bpo_gregs_section 2515 = bfd_get_section_by_name (bpo_greg_owner, 2516 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2517 2518 if (bpo_gregs_section == NULL) 2519 return; 2520 2521 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2522 if (gregdata == NULL) 2523 return; 2524 2525 if (pf == NULL) 2526 pf = _bfd_error_handler; 2527 2528 /* These format strings are not translated. They are for debug purposes 2529 only and never displayed to an end user. Should they escape, we 2530 surely want them in original. */ 2531 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\ 2532 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs, 2533 gregdata->n_max_bpo_relocs, 2534 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2535 gregdata->n_allocated_bpo_gregs); 2536 2537 if (gregdata->reloc_request) 2538 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2539 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n", 2540 i, 2541 (gregdata->bpo_reloc_indexes != NULL 2542 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1), 2543 gregdata->reloc_request[i].bpo_reloc_no, 2544 gregdata->reloc_request[i].valid, 2545 2546 (unsigned long) (gregdata->reloc_request[i].value >> 32), 2547 (unsigned long) gregdata->reloc_request[i].value, 2548 gregdata->reloc_request[i].regindex, 2549 gregdata->reloc_request[i].offset); 2550 } 2551 2552 /* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and 2553 when the last such reloc is done, an index-array is sorted according to 2554 the values and iterated over to produce register numbers (indexed by 0 2555 from the first allocated register number) and offsets for use in real 2556 relocation. (N.B.: Relocatable runs are handled, not just punted.) 2557 2558 PUSHJ stub accounting is also done here. 2559 2560 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 2561 2562 static bfd_boolean 2563 mmix_elf_relax_section (bfd *abfd, 2564 asection *sec, 2565 struct bfd_link_info *link_info, 2566 bfd_boolean *again) 2567 { 2568 Elf_Internal_Shdr *symtab_hdr; 2569 Elf_Internal_Rela *internal_relocs; 2570 Elf_Internal_Rela *irel, *irelend; 2571 asection *bpo_gregs_section = NULL; 2572 struct bpo_greg_section_info *gregdata; 2573 struct bpo_reloc_section_info *bpodata 2574 = mmix_elf_section_data (sec)->bpo.reloc; 2575 /* The initialization is to quiet compiler warnings. The value is to 2576 spot a missing actual initialization. */ 2577 size_t bpono = (size_t) -1; 2578 size_t pjsno = 0; 2579 Elf_Internal_Sym *isymbuf = NULL; 2580 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size; 2581 2582 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0; 2583 2584 /* Assume nothing changes. */ 2585 *again = FALSE; 2586 2587 /* We don't have to do anything if this section does not have relocs, or 2588 if this is not a code section. */ 2589 if ((sec->flags & SEC_RELOC) == 0 2590 || sec->reloc_count == 0 2591 || (sec->flags & SEC_CODE) == 0 2592 || (sec->flags & SEC_LINKER_CREATED) != 0 2593 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs, 2594 then nothing to do. */ 2595 || (bpodata == NULL 2596 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)) 2597 return TRUE; 2598 2599 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2600 2601 if (bpodata != NULL) 2602 { 2603 bpo_gregs_section = bpodata->bpo_greg_section; 2604 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2605 bpono = bpodata->first_base_plus_offset_reloc; 2606 } 2607 else 2608 gregdata = NULL; 2609 2610 /* Get a copy of the native relocations. */ 2611 internal_relocs 2612 = _bfd_elf_link_read_relocs (abfd, sec, NULL, 2613 (Elf_Internal_Rela *) NULL, 2614 link_info->keep_memory); 2615 if (internal_relocs == NULL) 2616 goto error_return; 2617 2618 /* Walk through them looking for relaxing opportunities. */ 2619 irelend = internal_relocs + sec->reloc_count; 2620 for (irel = internal_relocs; irel < irelend; irel++) 2621 { 2622 bfd_vma symval; 2623 struct elf_link_hash_entry *h = NULL; 2624 2625 /* We only process two relocs. */ 2626 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET 2627 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE) 2628 continue; 2629 2630 /* We process relocs in a distinctly different way when this is a 2631 relocatable link (for one, we don't look at symbols), so we avoid 2632 mixing its code with that for the "normal" relaxation. */ 2633 if (bfd_link_relocatable (link_info)) 2634 { 2635 /* The only transformation in a relocatable link is to generate 2636 a full stub at the location of the stub calculated for the 2637 input section, if the relocated stub location, the end of the 2638 output section plus earlier stubs, cannot be reached. Thus 2639 relocatable linking can only lead to worse code, but it still 2640 works. */ 2641 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE) 2642 { 2643 /* If we can reach the end of the output-section and beyond 2644 any current stubs, then we don't need a stub for this 2645 reloc. The relaxed order of output stub allocation may 2646 not exactly match the straightforward order, so we always 2647 assume presence of output stubs, which will allow 2648 relaxation only on relocations indifferent to the 2649 presence of output stub allocations for other relocations 2650 and thus the order of output stub allocation. */ 2651 if (bfd_check_overflow (complain_overflow_signed, 2652 19, 2653 0, 2654 bfd_arch_bits_per_address (abfd), 2655 /* Output-stub location. */ 2656 sec->output_section->rawsize 2657 + (mmix_elf_section_data (sec 2658 ->output_section) 2659 ->pjs.stubs_size_sum) 2660 /* Location of this PUSHJ reloc. */ 2661 - (sec->output_offset + irel->r_offset) 2662 /* Don't count *this* stub twice. */ 2663 - (mmix_elf_section_data (sec) 2664 ->pjs.stub_size[pjsno] 2665 + MAX_PUSHJ_STUB_SIZE)) 2666 == bfd_reloc_ok) 2667 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2668 2669 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2670 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2671 2672 pjsno++; 2673 } 2674 2675 continue; 2676 } 2677 2678 /* Get the value of the symbol referred to by the reloc. */ 2679 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2680 { 2681 /* A local symbol. */ 2682 Elf_Internal_Sym *isym; 2683 asection *sym_sec; 2684 2685 /* Read this BFD's local symbols if we haven't already. */ 2686 if (isymbuf == NULL) 2687 { 2688 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2689 if (isymbuf == NULL) 2690 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2691 symtab_hdr->sh_info, 0, 2692 NULL, NULL, NULL); 2693 if (isymbuf == 0) 2694 goto error_return; 2695 } 2696 2697 isym = isymbuf + ELF64_R_SYM (irel->r_info); 2698 if (isym->st_shndx == SHN_UNDEF) 2699 sym_sec = bfd_und_section_ptr; 2700 else if (isym->st_shndx == SHN_ABS) 2701 sym_sec = bfd_abs_section_ptr; 2702 else if (isym->st_shndx == SHN_COMMON) 2703 sym_sec = bfd_com_section_ptr; 2704 else 2705 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2706 symval = (isym->st_value 2707 + sym_sec->output_section->vma 2708 + sym_sec->output_offset); 2709 } 2710 else 2711 { 2712 unsigned long indx; 2713 2714 /* An external symbol. */ 2715 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2716 h = elf_sym_hashes (abfd)[indx]; 2717 BFD_ASSERT (h != NULL); 2718 if (h->root.type != bfd_link_hash_defined 2719 && h->root.type != bfd_link_hash_defweak) 2720 { 2721 /* This appears to be a reference to an undefined symbol. Just 2722 ignore it--it will be caught by the regular reloc processing. 2723 We need to keep BPO reloc accounting consistent, though 2724 else we'll abort instead of emitting an error message. */ 2725 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET 2726 && gregdata != NULL) 2727 { 2728 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2729 bpono++; 2730 } 2731 continue; 2732 } 2733 2734 symval = (h->root.u.def.value 2735 + h->root.u.def.section->output_section->vma 2736 + h->root.u.def.section->output_offset); 2737 } 2738 2739 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE) 2740 { 2741 bfd_vma value = symval + irel->r_addend; 2742 bfd_vma dot 2743 = (sec->output_section->vma 2744 + sec->output_offset 2745 + irel->r_offset); 2746 bfd_vma stubaddr 2747 = (sec->output_section->vma 2748 + sec->output_offset 2749 + size 2750 + mmix_elf_section_data (sec)->pjs.stubs_size_sum); 2751 2752 if ((value & 3) == 0 2753 && bfd_check_overflow (complain_overflow_signed, 2754 19, 2755 0, 2756 bfd_arch_bits_per_address (abfd), 2757 value - dot 2758 - (value > dot 2759 ? mmix_elf_section_data (sec) 2760 ->pjs.stub_size[pjsno] 2761 : 0)) 2762 == bfd_reloc_ok) 2763 /* If the reloc fits, no stub is needed. */ 2764 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2765 else 2766 /* Maybe we can get away with just a JMP insn? */ 2767 if ((value & 3) == 0 2768 && bfd_check_overflow (complain_overflow_signed, 2769 27, 2770 0, 2771 bfd_arch_bits_per_address (abfd), 2772 value - stubaddr 2773 - (value > dot 2774 ? mmix_elf_section_data (sec) 2775 ->pjs.stub_size[pjsno] - 4 2776 : 0)) 2777 == bfd_reloc_ok) 2778 /* Yep, account for a stub consisting of a single JMP insn. */ 2779 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4; 2780 else 2781 /* Nope, go for the full insn stub. It doesn't seem useful to 2782 emit the intermediate sizes; those will only be useful for 2783 a >64M program assuming contiguous code. */ 2784 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] 2785 = MAX_PUSHJ_STUB_SIZE; 2786 2787 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2788 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2789 pjsno++; 2790 continue; 2791 } 2792 2793 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */ 2794 2795 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value 2796 = symval + irel->r_addend; 2797 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE; 2798 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2799 } 2800 2801 /* Check if that was the last BPO-reloc. If so, sort the values and 2802 calculate how many registers we need to cover them. Set the size of 2803 the linker gregs, and if the number of registers changed, indicate 2804 that we need to relax some more because we have more work to do. */ 2805 if (gregdata != NULL 2806 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0) 2807 { 2808 size_t i; 2809 bfd_vma prev_base; 2810 size_t regindex; 2811 2812 /* First, reset the remaining relocs for the next round. */ 2813 gregdata->n_remaining_bpo_relocs_this_relaxation_round 2814 = gregdata->n_bpo_relocs; 2815 2816 qsort (gregdata->reloc_request, 2817 gregdata->n_max_bpo_relocs, 2818 sizeof (struct bpo_reloc_request), 2819 bpo_reloc_request_sort_fn); 2820 2821 /* Recalculate indexes. When we find a change (however unlikely 2822 after the initial iteration), we know we need to relax again, 2823 since items in the GREG-array are sorted by increasing value and 2824 stored in the relaxation phase. */ 2825 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2826 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2827 != i) 2828 { 2829 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2830 = i; 2831 *again = TRUE; 2832 } 2833 2834 /* Allocate register numbers (indexing from 0). Stop at the first 2835 non-valid reloc. */ 2836 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value; 2837 i < gregdata->n_bpo_relocs; 2838 i++) 2839 { 2840 if (gregdata->reloc_request[i].value > prev_base + 255) 2841 { 2842 regindex++; 2843 prev_base = gregdata->reloc_request[i].value; 2844 } 2845 gregdata->reloc_request[i].regindex = regindex; 2846 gregdata->reloc_request[i].offset 2847 = gregdata->reloc_request[i].value - prev_base; 2848 } 2849 2850 /* If it's not the same as the last time, we need to relax again, 2851 because the size of the section has changed. I'm not sure we 2852 actually need to do any adjustments since the shrinking happens 2853 at the start of this section, but better safe than sorry. */ 2854 if (gregdata->n_allocated_bpo_gregs != regindex + 1) 2855 { 2856 gregdata->n_allocated_bpo_gregs = regindex + 1; 2857 *again = TRUE; 2858 } 2859 2860 bpo_gregs_section->size = (regindex + 1) * 8; 2861 } 2862 2863 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2864 { 2865 if (! link_info->keep_memory) 2866 free (isymbuf); 2867 else 2868 { 2869 /* Cache the symbols for elf_link_input_bfd. */ 2870 symtab_hdr->contents = (unsigned char *) isymbuf; 2871 } 2872 } 2873 2874 if (internal_relocs != NULL 2875 && elf_section_data (sec)->relocs != internal_relocs) 2876 free (internal_relocs); 2877 2878 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2879 abort (); 2880 2881 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2882 { 2883 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum; 2884 *again = TRUE; 2885 } 2886 2887 return TRUE; 2888 2889 error_return: 2890 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2891 free (isymbuf); 2892 if (internal_relocs != NULL 2893 && elf_section_data (sec)->relocs != internal_relocs) 2894 free (internal_relocs); 2895 return FALSE; 2896 } 2897 2898 #define ELF_ARCH bfd_arch_mmix 2900 #define ELF_MACHINE_CODE EM_MMIX 2901 2902 /* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL). 2903 However, that's too much for something somewhere in the linker part of 2904 BFD; perhaps the start-address has to be a non-zero multiple of this 2905 number, or larger than this number. The symptom is that the linker 2906 complains: "warning: allocated section `.text' not in segment". We 2907 settle for 64k; the page-size used in examples is 8k. 2908 #define ELF_MAXPAGESIZE 0x10000 2909 2910 Unfortunately, this causes excessive padding in the supposedly small 2911 for-education programs that are the expected usage (where people would 2912 inspect output). We stick to 256 bytes just to have *some* default 2913 alignment. */ 2914 #define ELF_MAXPAGESIZE 0x100 2915 2916 #define TARGET_BIG_SYM mmix_elf64_vec 2917 #define TARGET_BIG_NAME "elf64-mmix" 2918 2919 #define elf_info_to_howto_rel NULL 2920 #define elf_info_to_howto mmix_info_to_howto_rela 2921 #define elf_backend_relocate_section mmix_elf_relocate_section 2922 #define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook 2923 #define elf_backend_gc_sweep_hook mmix_elf_gc_sweep_hook 2924 2925 #define elf_backend_link_output_symbol_hook \ 2926 mmix_elf_link_output_symbol_hook 2927 #define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook 2928 2929 #define elf_backend_check_relocs mmix_elf_check_relocs 2930 #define elf_backend_symbol_processing mmix_elf_symbol_processing 2931 #define elf_backend_omit_section_dynsym \ 2932 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 2933 2934 #define bfd_elf64_bfd_is_local_label_name \ 2935 mmix_elf_is_local_label_name 2936 2937 #define elf_backend_may_use_rel_p 0 2938 #define elf_backend_may_use_rela_p 1 2939 #define elf_backend_default_use_rela_p 1 2940 2941 #define elf_backend_can_gc_sections 1 2942 #define elf_backend_section_from_bfd_section \ 2943 mmix_elf_section_from_bfd_section 2944 2945 #define bfd_elf64_new_section_hook mmix_elf_new_section_hook 2946 #define bfd_elf64_bfd_final_link mmix_elf_final_link 2947 #define bfd_elf64_bfd_relax_section mmix_elf_relax_section 2948 2949 #include "elf64-target.h" 2950
Indexes created Fri May 01 00:23:41 UTC 2026