elf64-mmix.c revision 1.1.1.1
1 /* MMIX-specific support for 64-bit ELF. 2 Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007 3 Free Software Foundation, Inc. 4 Contributed by Hans-Peter Nilsson <hp (at) bitrange.com> 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 24 /* No specific ABI or "processor-specific supplement" defined. */ 25 26 /* TODO: 27 - "Traditional" linker relaxation (shrinking whole sections). 28 - Merge reloc stubs jumping to same location. 29 - GETA stub relaxation (call a stub for out of range new 30 R_MMIX_GETA_STUBBABLE). */ 31 32 #include "sysdep.h" 33 #include "bfd.h" 34 #include "libbfd.h" 35 #include "elf-bfd.h" 36 #include "elf/mmix.h" 37 #include "opcode/mmix.h" 38 39 #define MINUS_ONE (((bfd_vma) 0) - 1) 40 41 #define MAX_PUSHJ_STUB_SIZE (5 * 4) 42 43 /* Put these everywhere in new code. */ 44 #define FATAL_DEBUG \ 45 _bfd_abort (__FILE__, __LINE__, \ 46 "Internal: Non-debugged code (test-case missing)") 47 48 #define BAD_CASE(x) \ 49 _bfd_abort (__FILE__, __LINE__, \ 50 "bad case for " #x) 51 52 struct _mmix_elf_section_data 53 { 54 struct bfd_elf_section_data elf; 55 union 56 { 57 struct bpo_reloc_section_info *reloc; 58 struct bpo_greg_section_info *greg; 59 } bpo; 60 61 struct pushj_stub_info 62 { 63 /* Maximum number of stubs needed for this section. */ 64 bfd_size_type n_pushj_relocs; 65 66 /* Size of stubs after a mmix_elf_relax_section round. */ 67 bfd_size_type stubs_size_sum; 68 69 /* Per-reloc stubs_size_sum information. The stubs_size_sum member is the sum 70 of these. Allocated in mmix_elf_check_common_relocs. */ 71 bfd_size_type *stub_size; 72 73 /* Offset of next stub during relocation. Somewhat redundant with the 74 above: error coverage is easier and we don't have to reset the 75 stubs_size_sum for relocation. */ 76 bfd_size_type stub_offset; 77 } pjs; 78 }; 79 80 #define mmix_elf_section_data(sec) \ 81 ((struct _mmix_elf_section_data *) elf_section_data (sec)) 82 83 /* For each section containing a base-plus-offset (BPO) reloc, we attach 84 this struct as mmix_elf_section_data (section)->bpo, which is otherwise 85 NULL. */ 86 struct bpo_reloc_section_info 87 { 88 /* The base is 1; this is the first number in this section. */ 89 size_t first_base_plus_offset_reloc; 90 91 /* Number of BPO-relocs in this section. */ 92 size_t n_bpo_relocs_this_section; 93 94 /* Running index, used at relocation time. */ 95 size_t bpo_index; 96 97 /* We don't have access to the bfd_link_info struct in 98 mmix_final_link_relocate. What we really want to get at is the 99 global single struct greg_relocation, so we stash it here. */ 100 asection *bpo_greg_section; 101 }; 102 103 /* Helper struct (in global context) for the one below. 104 There's one of these created for every BPO reloc. */ 105 struct bpo_reloc_request 106 { 107 bfd_vma value; 108 109 /* Valid after relaxation. The base is 0; the first register number 110 must be added. The offset is in range 0..255. */ 111 size_t regindex; 112 size_t offset; 113 114 /* The order number for this BPO reloc, corresponding to the order in 115 which BPO relocs were found. Used to create an index after reloc 116 requests are sorted. */ 117 size_t bpo_reloc_no; 118 119 /* Set when the value is computed. Better than coding "guard values" 120 into the other members. Is FALSE only for BPO relocs in a GC:ed 121 section. */ 122 bfd_boolean valid; 123 }; 124 125 /* We attach this as mmix_elf_section_data (sec)->bpo in the linker-allocated 126 greg contents section (MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME), 127 which is linked into the register contents section 128 (MMIX_REG_CONTENTS_SECTION_NAME). This section is created by the 129 linker; using the same hook as for usual with BPO relocs does not 130 collide. */ 131 struct bpo_greg_section_info 132 { 133 /* After GC, this reflects the number of remaining, non-excluded 134 BPO-relocs. */ 135 size_t n_bpo_relocs; 136 137 /* This is the number of allocated bpo_reloc_requests; the size of 138 sorted_indexes. Valid after the check.*relocs functions are called 139 for all incoming sections. It includes the number of BPO relocs in 140 sections that were GC:ed. */ 141 size_t n_max_bpo_relocs; 142 143 /* A counter used to find out when to fold the BPO gregs, since we 144 don't have a single "after-relaxation" hook. */ 145 size_t n_remaining_bpo_relocs_this_relaxation_round; 146 147 /* The number of linker-allocated GREGs resulting from BPO relocs. 148 This is an approximation after _bfd_mmix_before_linker_allocation 149 and supposedly accurate after mmix_elf_relax_section is called for 150 all incoming non-collected sections. */ 151 size_t n_allocated_bpo_gregs; 152 153 /* Index into reloc_request[], sorted on increasing "value", secondary 154 by increasing index for strict sorting order. */ 155 size_t *bpo_reloc_indexes; 156 157 /* An array of all relocations, with the "value" member filled in by 158 the relaxation function. */ 159 struct bpo_reloc_request *reloc_request; 160 }; 161 162 static bfd_boolean mmix_elf_link_output_symbol_hook 163 PARAMS ((struct bfd_link_info *, const char *, Elf_Internal_Sym *, 164 asection *, struct elf_link_hash_entry *)); 165 166 static bfd_reloc_status_type mmix_elf_reloc 167 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); 168 169 static reloc_howto_type *bfd_elf64_bfd_reloc_type_lookup 170 PARAMS ((bfd *, bfd_reloc_code_real_type)); 171 172 static void mmix_info_to_howto_rela 173 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 174 175 static int mmix_elf_sort_relocs PARAMS ((const PTR, const PTR)); 176 177 static bfd_boolean mmix_elf_new_section_hook 178 PARAMS ((bfd *, asection *)); 179 180 static bfd_boolean mmix_elf_check_relocs 181 PARAMS ((bfd *, struct bfd_link_info *, asection *, 182 const Elf_Internal_Rela *)); 183 184 static bfd_boolean mmix_elf_check_common_relocs 185 PARAMS ((bfd *, struct bfd_link_info *, asection *, 186 const Elf_Internal_Rela *)); 187 188 static bfd_boolean mmix_elf_relocate_section 189 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 190 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 191 192 static bfd_reloc_status_type mmix_final_link_relocate 193 PARAMS ((reloc_howto_type *, asection *, bfd_byte *, 194 bfd_vma, bfd_signed_vma, bfd_vma, const char *, asection *)); 195 196 static bfd_reloc_status_type mmix_elf_perform_relocation 197 PARAMS ((asection *, reloc_howto_type *, PTR, bfd_vma, bfd_vma)); 198 199 static bfd_boolean mmix_elf_section_from_bfd_section 200 PARAMS ((bfd *, asection *, int *)); 201 202 static bfd_boolean mmix_elf_add_symbol_hook 203 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Sym *, 204 const char **, flagword *, asection **, bfd_vma *)); 205 206 static bfd_boolean mmix_elf_is_local_label_name 207 PARAMS ((bfd *, const char *)); 208 209 static int bpo_reloc_request_sort_fn PARAMS ((const PTR, const PTR)); 210 211 static bfd_boolean mmix_elf_relax_section 212 PARAMS ((bfd *abfd, asection *sec, struct bfd_link_info *link_info, 213 bfd_boolean *again)); 214 215 extern bfd_boolean mmix_elf_final_link PARAMS ((bfd *, struct bfd_link_info *)); 216 217 extern void mmix_elf_symbol_processing PARAMS ((bfd *, asymbol *)); 218 219 /* Only intended to be called from a debugger. */ 220 extern void mmix_dump_bpo_gregs 221 PARAMS ((struct bfd_link_info *, bfd_error_handler_type)); 222 223 static void 224 mmix_set_relaxable_size 225 PARAMS ((bfd *, asection *, void *)); 226 227 228 /* Watch out: this currently needs to have elements with the same index as 229 their R_MMIX_ number. */ 230 static reloc_howto_type elf_mmix_howto_table[] = 231 { 232 /* This reloc does nothing. */ 233 HOWTO (R_MMIX_NONE, /* type */ 234 0, /* rightshift */ 235 2, /* size (0 = byte, 1 = short, 2 = long) */ 236 32, /* bitsize */ 237 FALSE, /* pc_relative */ 238 0, /* bitpos */ 239 complain_overflow_bitfield, /* complain_on_overflow */ 240 bfd_elf_generic_reloc, /* special_function */ 241 "R_MMIX_NONE", /* name */ 242 FALSE, /* partial_inplace */ 243 0, /* src_mask */ 244 0, /* dst_mask */ 245 FALSE), /* pcrel_offset */ 246 247 /* An 8 bit absolute relocation. */ 248 HOWTO (R_MMIX_8, /* type */ 249 0, /* rightshift */ 250 0, /* size (0 = byte, 1 = short, 2 = long) */ 251 8, /* bitsize */ 252 FALSE, /* pc_relative */ 253 0, /* bitpos */ 254 complain_overflow_bitfield, /* complain_on_overflow */ 255 bfd_elf_generic_reloc, /* special_function */ 256 "R_MMIX_8", /* name */ 257 FALSE, /* partial_inplace */ 258 0, /* src_mask */ 259 0xff, /* dst_mask */ 260 FALSE), /* pcrel_offset */ 261 262 /* An 16 bit absolute relocation. */ 263 HOWTO (R_MMIX_16, /* type */ 264 0, /* rightshift */ 265 1, /* size (0 = byte, 1 = short, 2 = long) */ 266 16, /* bitsize */ 267 FALSE, /* pc_relative */ 268 0, /* bitpos */ 269 complain_overflow_bitfield, /* complain_on_overflow */ 270 bfd_elf_generic_reloc, /* special_function */ 271 "R_MMIX_16", /* name */ 272 FALSE, /* partial_inplace */ 273 0, /* src_mask */ 274 0xffff, /* dst_mask */ 275 FALSE), /* pcrel_offset */ 276 277 /* An 24 bit absolute relocation. */ 278 HOWTO (R_MMIX_24, /* type */ 279 0, /* rightshift */ 280 2, /* size (0 = byte, 1 = short, 2 = long) */ 281 24, /* bitsize */ 282 FALSE, /* pc_relative */ 283 0, /* bitpos */ 284 complain_overflow_bitfield, /* complain_on_overflow */ 285 bfd_elf_generic_reloc, /* special_function */ 286 "R_MMIX_24", /* name */ 287 FALSE, /* partial_inplace */ 288 ~0xffffff, /* src_mask */ 289 0xffffff, /* dst_mask */ 290 FALSE), /* pcrel_offset */ 291 292 /* A 32 bit absolute relocation. */ 293 HOWTO (R_MMIX_32, /* type */ 294 0, /* rightshift */ 295 2, /* size (0 = byte, 1 = short, 2 = long) */ 296 32, /* bitsize */ 297 FALSE, /* pc_relative */ 298 0, /* bitpos */ 299 complain_overflow_bitfield, /* complain_on_overflow */ 300 bfd_elf_generic_reloc, /* special_function */ 301 "R_MMIX_32", /* name */ 302 FALSE, /* partial_inplace */ 303 0, /* src_mask */ 304 0xffffffff, /* dst_mask */ 305 FALSE), /* pcrel_offset */ 306 307 /* 64 bit relocation. */ 308 HOWTO (R_MMIX_64, /* type */ 309 0, /* rightshift */ 310 4, /* size (0 = byte, 1 = short, 2 = long) */ 311 64, /* bitsize */ 312 FALSE, /* pc_relative */ 313 0, /* bitpos */ 314 complain_overflow_bitfield, /* complain_on_overflow */ 315 bfd_elf_generic_reloc, /* special_function */ 316 "R_MMIX_64", /* name */ 317 FALSE, /* partial_inplace */ 318 0, /* src_mask */ 319 MINUS_ONE, /* dst_mask */ 320 FALSE), /* pcrel_offset */ 321 322 /* An 8 bit PC-relative relocation. */ 323 HOWTO (R_MMIX_PC_8, /* type */ 324 0, /* rightshift */ 325 0, /* size (0 = byte, 1 = short, 2 = long) */ 326 8, /* bitsize */ 327 TRUE, /* pc_relative */ 328 0, /* bitpos */ 329 complain_overflow_bitfield, /* complain_on_overflow */ 330 bfd_elf_generic_reloc, /* special_function */ 331 "R_MMIX_PC_8", /* name */ 332 FALSE, /* partial_inplace */ 333 0, /* src_mask */ 334 0xff, /* dst_mask */ 335 TRUE), /* pcrel_offset */ 336 337 /* An 16 bit PC-relative relocation. */ 338 HOWTO (R_MMIX_PC_16, /* type */ 339 0, /* rightshift */ 340 1, /* size (0 = byte, 1 = short, 2 = long) */ 341 16, /* bitsize */ 342 TRUE, /* pc_relative */ 343 0, /* bitpos */ 344 complain_overflow_bitfield, /* complain_on_overflow */ 345 bfd_elf_generic_reloc, /* special_function */ 346 "R_MMIX_PC_16", /* name */ 347 FALSE, /* partial_inplace */ 348 0, /* src_mask */ 349 0xffff, /* dst_mask */ 350 TRUE), /* pcrel_offset */ 351 352 /* An 24 bit PC-relative relocation. */ 353 HOWTO (R_MMIX_PC_24, /* type */ 354 0, /* rightshift */ 355 2, /* size (0 = byte, 1 = short, 2 = long) */ 356 24, /* bitsize */ 357 TRUE, /* pc_relative */ 358 0, /* bitpos */ 359 complain_overflow_bitfield, /* complain_on_overflow */ 360 bfd_elf_generic_reloc, /* special_function */ 361 "R_MMIX_PC_24", /* name */ 362 FALSE, /* partial_inplace */ 363 ~0xffffff, /* src_mask */ 364 0xffffff, /* dst_mask */ 365 TRUE), /* pcrel_offset */ 366 367 /* A 32 bit absolute PC-relative relocation. */ 368 HOWTO (R_MMIX_PC_32, /* type */ 369 0, /* rightshift */ 370 2, /* size (0 = byte, 1 = short, 2 = long) */ 371 32, /* bitsize */ 372 TRUE, /* pc_relative */ 373 0, /* bitpos */ 374 complain_overflow_bitfield, /* complain_on_overflow */ 375 bfd_elf_generic_reloc, /* special_function */ 376 "R_MMIX_PC_32", /* name */ 377 FALSE, /* partial_inplace */ 378 0, /* src_mask */ 379 0xffffffff, /* dst_mask */ 380 TRUE), /* pcrel_offset */ 381 382 /* 64 bit PC-relative relocation. */ 383 HOWTO (R_MMIX_PC_64, /* type */ 384 0, /* rightshift */ 385 4, /* size (0 = byte, 1 = short, 2 = long) */ 386 64, /* bitsize */ 387 TRUE, /* pc_relative */ 388 0, /* bitpos */ 389 complain_overflow_bitfield, /* complain_on_overflow */ 390 bfd_elf_generic_reloc, /* special_function */ 391 "R_MMIX_PC_64", /* name */ 392 FALSE, /* partial_inplace */ 393 0, /* src_mask */ 394 MINUS_ONE, /* dst_mask */ 395 TRUE), /* pcrel_offset */ 396 397 /* GNU extension to record C++ vtable hierarchy. */ 398 HOWTO (R_MMIX_GNU_VTINHERIT, /* type */ 399 0, /* rightshift */ 400 0, /* size (0 = byte, 1 = short, 2 = long) */ 401 0, /* bitsize */ 402 FALSE, /* pc_relative */ 403 0, /* bitpos */ 404 complain_overflow_dont, /* complain_on_overflow */ 405 NULL, /* special_function */ 406 "R_MMIX_GNU_VTINHERIT", /* name */ 407 FALSE, /* partial_inplace */ 408 0, /* src_mask */ 409 0, /* dst_mask */ 410 TRUE), /* pcrel_offset */ 411 412 /* GNU extension to record C++ vtable member usage. */ 413 HOWTO (R_MMIX_GNU_VTENTRY, /* type */ 414 0, /* rightshift */ 415 0, /* size (0 = byte, 1 = short, 2 = long) */ 416 0, /* bitsize */ 417 FALSE, /* pc_relative */ 418 0, /* bitpos */ 419 complain_overflow_dont, /* complain_on_overflow */ 420 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 421 "R_MMIX_GNU_VTENTRY", /* name */ 422 FALSE, /* partial_inplace */ 423 0, /* src_mask */ 424 0, /* dst_mask */ 425 FALSE), /* pcrel_offset */ 426 427 /* The GETA relocation is supposed to get any address that could 428 possibly be reached by the GETA instruction. It can silently expand 429 to get a 64-bit operand, but will complain if any of the two least 430 significant bits are set. The howto members reflect a simple GETA. */ 431 HOWTO (R_MMIX_GETA, /* type */ 432 2, /* rightshift */ 433 2, /* size (0 = byte, 1 = short, 2 = long) */ 434 19, /* bitsize */ 435 TRUE, /* pc_relative */ 436 0, /* bitpos */ 437 complain_overflow_signed, /* complain_on_overflow */ 438 mmix_elf_reloc, /* special_function */ 439 "R_MMIX_GETA", /* name */ 440 FALSE, /* partial_inplace */ 441 ~0x0100ffff, /* src_mask */ 442 0x0100ffff, /* dst_mask */ 443 TRUE), /* pcrel_offset */ 444 445 HOWTO (R_MMIX_GETA_1, /* type */ 446 2, /* rightshift */ 447 2, /* size (0 = byte, 1 = short, 2 = long) */ 448 19, /* bitsize */ 449 TRUE, /* pc_relative */ 450 0, /* bitpos */ 451 complain_overflow_signed, /* complain_on_overflow */ 452 mmix_elf_reloc, /* special_function */ 453 "R_MMIX_GETA_1", /* name */ 454 FALSE, /* partial_inplace */ 455 ~0x0100ffff, /* src_mask */ 456 0x0100ffff, /* dst_mask */ 457 TRUE), /* pcrel_offset */ 458 459 HOWTO (R_MMIX_GETA_2, /* type */ 460 2, /* rightshift */ 461 2, /* size (0 = byte, 1 = short, 2 = long) */ 462 19, /* bitsize */ 463 TRUE, /* pc_relative */ 464 0, /* bitpos */ 465 complain_overflow_signed, /* complain_on_overflow */ 466 mmix_elf_reloc, /* special_function */ 467 "R_MMIX_GETA_2", /* name */ 468 FALSE, /* partial_inplace */ 469 ~0x0100ffff, /* src_mask */ 470 0x0100ffff, /* dst_mask */ 471 TRUE), /* pcrel_offset */ 472 473 HOWTO (R_MMIX_GETA_3, /* type */ 474 2, /* rightshift */ 475 2, /* size (0 = byte, 1 = short, 2 = long) */ 476 19, /* bitsize */ 477 TRUE, /* pc_relative */ 478 0, /* bitpos */ 479 complain_overflow_signed, /* complain_on_overflow */ 480 mmix_elf_reloc, /* special_function */ 481 "R_MMIX_GETA_3", /* name */ 482 FALSE, /* partial_inplace */ 483 ~0x0100ffff, /* src_mask */ 484 0x0100ffff, /* dst_mask */ 485 TRUE), /* pcrel_offset */ 486 487 /* The conditional branches are supposed to reach any (code) address. 488 It can silently expand to a 64-bit operand, but will emit an error if 489 any of the two least significant bits are set. The howto members 490 reflect a simple branch. */ 491 HOWTO (R_MMIX_CBRANCH, /* type */ 492 2, /* rightshift */ 493 2, /* size (0 = byte, 1 = short, 2 = long) */ 494 19, /* bitsize */ 495 TRUE, /* pc_relative */ 496 0, /* bitpos */ 497 complain_overflow_signed, /* complain_on_overflow */ 498 mmix_elf_reloc, /* special_function */ 499 "R_MMIX_CBRANCH", /* name */ 500 FALSE, /* partial_inplace */ 501 ~0x0100ffff, /* src_mask */ 502 0x0100ffff, /* dst_mask */ 503 TRUE), /* pcrel_offset */ 504 505 HOWTO (R_MMIX_CBRANCH_J, /* type */ 506 2, /* rightshift */ 507 2, /* size (0 = byte, 1 = short, 2 = long) */ 508 19, /* bitsize */ 509 TRUE, /* pc_relative */ 510 0, /* bitpos */ 511 complain_overflow_signed, /* complain_on_overflow */ 512 mmix_elf_reloc, /* special_function */ 513 "R_MMIX_CBRANCH_J", /* name */ 514 FALSE, /* partial_inplace */ 515 ~0x0100ffff, /* src_mask */ 516 0x0100ffff, /* dst_mask */ 517 TRUE), /* pcrel_offset */ 518 519 HOWTO (R_MMIX_CBRANCH_1, /* type */ 520 2, /* rightshift */ 521 2, /* size (0 = byte, 1 = short, 2 = long) */ 522 19, /* bitsize */ 523 TRUE, /* pc_relative */ 524 0, /* bitpos */ 525 complain_overflow_signed, /* complain_on_overflow */ 526 mmix_elf_reloc, /* special_function */ 527 "R_MMIX_CBRANCH_1", /* name */ 528 FALSE, /* partial_inplace */ 529 ~0x0100ffff, /* src_mask */ 530 0x0100ffff, /* dst_mask */ 531 TRUE), /* pcrel_offset */ 532 533 HOWTO (R_MMIX_CBRANCH_2, /* type */ 534 2, /* rightshift */ 535 2, /* size (0 = byte, 1 = short, 2 = long) */ 536 19, /* bitsize */ 537 TRUE, /* pc_relative */ 538 0, /* bitpos */ 539 complain_overflow_signed, /* complain_on_overflow */ 540 mmix_elf_reloc, /* special_function */ 541 "R_MMIX_CBRANCH_2", /* name */ 542 FALSE, /* partial_inplace */ 543 ~0x0100ffff, /* src_mask */ 544 0x0100ffff, /* dst_mask */ 545 TRUE), /* pcrel_offset */ 546 547 HOWTO (R_MMIX_CBRANCH_3, /* type */ 548 2, /* rightshift */ 549 2, /* size (0 = byte, 1 = short, 2 = long) */ 550 19, /* bitsize */ 551 TRUE, /* pc_relative */ 552 0, /* bitpos */ 553 complain_overflow_signed, /* complain_on_overflow */ 554 mmix_elf_reloc, /* special_function */ 555 "R_MMIX_CBRANCH_3", /* name */ 556 FALSE, /* partial_inplace */ 557 ~0x0100ffff, /* src_mask */ 558 0x0100ffff, /* dst_mask */ 559 TRUE), /* pcrel_offset */ 560 561 /* The PUSHJ instruction can reach any (code) address, as long as it's 562 the beginning of a function (no usable restriction). It can silently 563 expand to a 64-bit operand, but will emit an error if any of the two 564 least significant bits are set. It can also expand into a call to a 565 stub; see R_MMIX_PUSHJ_STUBBABLE. The howto members reflect a simple 566 PUSHJ. */ 567 HOWTO (R_MMIX_PUSHJ, /* type */ 568 2, /* rightshift */ 569 2, /* size (0 = byte, 1 = short, 2 = long) */ 570 19, /* bitsize */ 571 TRUE, /* pc_relative */ 572 0, /* bitpos */ 573 complain_overflow_signed, /* complain_on_overflow */ 574 mmix_elf_reloc, /* special_function */ 575 "R_MMIX_PUSHJ", /* name */ 576 FALSE, /* partial_inplace */ 577 ~0x0100ffff, /* src_mask */ 578 0x0100ffff, /* dst_mask */ 579 TRUE), /* pcrel_offset */ 580 581 HOWTO (R_MMIX_PUSHJ_1, /* type */ 582 2, /* rightshift */ 583 2, /* size (0 = byte, 1 = short, 2 = long) */ 584 19, /* bitsize */ 585 TRUE, /* pc_relative */ 586 0, /* bitpos */ 587 complain_overflow_signed, /* complain_on_overflow */ 588 mmix_elf_reloc, /* special_function */ 589 "R_MMIX_PUSHJ_1", /* name */ 590 FALSE, /* partial_inplace */ 591 ~0x0100ffff, /* src_mask */ 592 0x0100ffff, /* dst_mask */ 593 TRUE), /* pcrel_offset */ 594 595 HOWTO (R_MMIX_PUSHJ_2, /* type */ 596 2, /* rightshift */ 597 2, /* size (0 = byte, 1 = short, 2 = long) */ 598 19, /* bitsize */ 599 TRUE, /* pc_relative */ 600 0, /* bitpos */ 601 complain_overflow_signed, /* complain_on_overflow */ 602 mmix_elf_reloc, /* special_function */ 603 "R_MMIX_PUSHJ_2", /* name */ 604 FALSE, /* partial_inplace */ 605 ~0x0100ffff, /* src_mask */ 606 0x0100ffff, /* dst_mask */ 607 TRUE), /* pcrel_offset */ 608 609 HOWTO (R_MMIX_PUSHJ_3, /* type */ 610 2, /* rightshift */ 611 2, /* size (0 = byte, 1 = short, 2 = long) */ 612 19, /* bitsize */ 613 TRUE, /* pc_relative */ 614 0, /* bitpos */ 615 complain_overflow_signed, /* complain_on_overflow */ 616 mmix_elf_reloc, /* special_function */ 617 "R_MMIX_PUSHJ_3", /* name */ 618 FALSE, /* partial_inplace */ 619 ~0x0100ffff, /* src_mask */ 620 0x0100ffff, /* dst_mask */ 621 TRUE), /* pcrel_offset */ 622 623 /* A JMP is supposed to reach any (code) address. By itself, it can 624 reach +-64M; the expansion can reach all 64 bits. Note that the 64M 625 limit is soon reached if you link the program in wildly different 626 memory segments. The howto members reflect a trivial JMP. */ 627 HOWTO (R_MMIX_JMP, /* type */ 628 2, /* rightshift */ 629 2, /* size (0 = byte, 1 = short, 2 = long) */ 630 27, /* bitsize */ 631 TRUE, /* pc_relative */ 632 0, /* bitpos */ 633 complain_overflow_signed, /* complain_on_overflow */ 634 mmix_elf_reloc, /* special_function */ 635 "R_MMIX_JMP", /* name */ 636 FALSE, /* partial_inplace */ 637 ~0x1ffffff, /* src_mask */ 638 0x1ffffff, /* dst_mask */ 639 TRUE), /* pcrel_offset */ 640 641 HOWTO (R_MMIX_JMP_1, /* type */ 642 2, /* rightshift */ 643 2, /* size (0 = byte, 1 = short, 2 = long) */ 644 27, /* bitsize */ 645 TRUE, /* pc_relative */ 646 0, /* bitpos */ 647 complain_overflow_signed, /* complain_on_overflow */ 648 mmix_elf_reloc, /* special_function */ 649 "R_MMIX_JMP_1", /* name */ 650 FALSE, /* partial_inplace */ 651 ~0x1ffffff, /* src_mask */ 652 0x1ffffff, /* dst_mask */ 653 TRUE), /* pcrel_offset */ 654 655 HOWTO (R_MMIX_JMP_2, /* type */ 656 2, /* rightshift */ 657 2, /* size (0 = byte, 1 = short, 2 = long) */ 658 27, /* bitsize */ 659 TRUE, /* pc_relative */ 660 0, /* bitpos */ 661 complain_overflow_signed, /* complain_on_overflow */ 662 mmix_elf_reloc, /* special_function */ 663 "R_MMIX_JMP_2", /* name */ 664 FALSE, /* partial_inplace */ 665 ~0x1ffffff, /* src_mask */ 666 0x1ffffff, /* dst_mask */ 667 TRUE), /* pcrel_offset */ 668 669 HOWTO (R_MMIX_JMP_3, /* type */ 670 2, /* rightshift */ 671 2, /* size (0 = byte, 1 = short, 2 = long) */ 672 27, /* bitsize */ 673 TRUE, /* pc_relative */ 674 0, /* bitpos */ 675 complain_overflow_signed, /* complain_on_overflow */ 676 mmix_elf_reloc, /* special_function */ 677 "R_MMIX_JMP_3", /* name */ 678 FALSE, /* partial_inplace */ 679 ~0x1ffffff, /* src_mask */ 680 0x1ffffff, /* dst_mask */ 681 TRUE), /* pcrel_offset */ 682 683 /* When we don't emit link-time-relaxable code from the assembler, or 684 when relaxation has done all it can do, these relocs are used. For 685 GETA/PUSHJ/branches. */ 686 HOWTO (R_MMIX_ADDR19, /* type */ 687 2, /* rightshift */ 688 2, /* size (0 = byte, 1 = short, 2 = long) */ 689 19, /* bitsize */ 690 TRUE, /* pc_relative */ 691 0, /* bitpos */ 692 complain_overflow_signed, /* complain_on_overflow */ 693 mmix_elf_reloc, /* special_function */ 694 "R_MMIX_ADDR19", /* name */ 695 FALSE, /* partial_inplace */ 696 ~0x0100ffff, /* src_mask */ 697 0x0100ffff, /* dst_mask */ 698 TRUE), /* pcrel_offset */ 699 700 /* For JMP. */ 701 HOWTO (R_MMIX_ADDR27, /* type */ 702 2, /* rightshift */ 703 2, /* size (0 = byte, 1 = short, 2 = long) */ 704 27, /* bitsize */ 705 TRUE, /* pc_relative */ 706 0, /* bitpos */ 707 complain_overflow_signed, /* complain_on_overflow */ 708 mmix_elf_reloc, /* special_function */ 709 "R_MMIX_ADDR27", /* name */ 710 FALSE, /* partial_inplace */ 711 ~0x1ffffff, /* src_mask */ 712 0x1ffffff, /* dst_mask */ 713 TRUE), /* pcrel_offset */ 714 715 /* A general register or the value 0..255. If a value, then the 716 instruction (offset -3) needs adjusting. */ 717 HOWTO (R_MMIX_REG_OR_BYTE, /* type */ 718 0, /* rightshift */ 719 1, /* size (0 = byte, 1 = short, 2 = long) */ 720 8, /* bitsize */ 721 FALSE, /* pc_relative */ 722 0, /* bitpos */ 723 complain_overflow_bitfield, /* complain_on_overflow */ 724 mmix_elf_reloc, /* special_function */ 725 "R_MMIX_REG_OR_BYTE", /* name */ 726 FALSE, /* partial_inplace */ 727 0, /* src_mask */ 728 0xff, /* dst_mask */ 729 FALSE), /* pcrel_offset */ 730 731 /* A general register. */ 732 HOWTO (R_MMIX_REG, /* type */ 733 0, /* rightshift */ 734 1, /* size (0 = byte, 1 = short, 2 = long) */ 735 8, /* bitsize */ 736 FALSE, /* pc_relative */ 737 0, /* bitpos */ 738 complain_overflow_bitfield, /* complain_on_overflow */ 739 mmix_elf_reloc, /* special_function */ 740 "R_MMIX_REG", /* name */ 741 FALSE, /* partial_inplace */ 742 0, /* src_mask */ 743 0xff, /* dst_mask */ 744 FALSE), /* pcrel_offset */ 745 746 /* A register plus an index, corresponding to the relocation expression. 747 The sizes must correspond to the valid range of the expression, while 748 the bitmasks correspond to what we store in the image. */ 749 HOWTO (R_MMIX_BASE_PLUS_OFFSET, /* type */ 750 0, /* rightshift */ 751 4, /* size (0 = byte, 1 = short, 2 = long) */ 752 64, /* bitsize */ 753 FALSE, /* pc_relative */ 754 0, /* bitpos */ 755 complain_overflow_bitfield, /* complain_on_overflow */ 756 mmix_elf_reloc, /* special_function */ 757 "R_MMIX_BASE_PLUS_OFFSET", /* name */ 758 FALSE, /* partial_inplace */ 759 0, /* src_mask */ 760 0xffff, /* dst_mask */ 761 FALSE), /* pcrel_offset */ 762 763 /* A "magic" relocation for a LOCAL expression, asserting that the 764 expression is less than the number of global registers. No actual 765 modification of the contents is done. Implementing this as a 766 relocation was less intrusive than e.g. putting such expressions in a 767 section to discard *after* relocation. */ 768 HOWTO (R_MMIX_LOCAL, /* type */ 769 0, /* rightshift */ 770 0, /* size (0 = byte, 1 = short, 2 = long) */ 771 0, /* bitsize */ 772 FALSE, /* pc_relative */ 773 0, /* bitpos */ 774 complain_overflow_dont, /* complain_on_overflow */ 775 mmix_elf_reloc, /* special_function */ 776 "R_MMIX_LOCAL", /* name */ 777 FALSE, /* partial_inplace */ 778 0, /* src_mask */ 779 0, /* dst_mask */ 780 FALSE), /* pcrel_offset */ 781 782 HOWTO (R_MMIX_PUSHJ_STUBBABLE, /* type */ 783 2, /* rightshift */ 784 2, /* size (0 = byte, 1 = short, 2 = long) */ 785 19, /* bitsize */ 786 TRUE, /* pc_relative */ 787 0, /* bitpos */ 788 complain_overflow_signed, /* complain_on_overflow */ 789 mmix_elf_reloc, /* special_function */ 790 "R_MMIX_PUSHJ_STUBBABLE", /* name */ 791 FALSE, /* partial_inplace */ 792 ~0x0100ffff, /* src_mask */ 793 0x0100ffff, /* dst_mask */ 794 TRUE) /* pcrel_offset */ 795 }; 796 797 798 /* Map BFD reloc types to MMIX ELF reloc types. */ 799 800 struct mmix_reloc_map 801 { 802 bfd_reloc_code_real_type bfd_reloc_val; 803 enum elf_mmix_reloc_type elf_reloc_val; 804 }; 805 806 807 static const struct mmix_reloc_map mmix_reloc_map[] = 808 { 809 {BFD_RELOC_NONE, R_MMIX_NONE}, 810 {BFD_RELOC_8, R_MMIX_8}, 811 {BFD_RELOC_16, R_MMIX_16}, 812 {BFD_RELOC_24, R_MMIX_24}, 813 {BFD_RELOC_32, R_MMIX_32}, 814 {BFD_RELOC_64, R_MMIX_64}, 815 {BFD_RELOC_8_PCREL, R_MMIX_PC_8}, 816 {BFD_RELOC_16_PCREL, R_MMIX_PC_16}, 817 {BFD_RELOC_24_PCREL, R_MMIX_PC_24}, 818 {BFD_RELOC_32_PCREL, R_MMIX_PC_32}, 819 {BFD_RELOC_64_PCREL, R_MMIX_PC_64}, 820 {BFD_RELOC_VTABLE_INHERIT, R_MMIX_GNU_VTINHERIT}, 821 {BFD_RELOC_VTABLE_ENTRY, R_MMIX_GNU_VTENTRY}, 822 {BFD_RELOC_MMIX_GETA, R_MMIX_GETA}, 823 {BFD_RELOC_MMIX_CBRANCH, R_MMIX_CBRANCH}, 824 {BFD_RELOC_MMIX_PUSHJ, R_MMIX_PUSHJ}, 825 {BFD_RELOC_MMIX_JMP, R_MMIX_JMP}, 826 {BFD_RELOC_MMIX_ADDR19, R_MMIX_ADDR19}, 827 {BFD_RELOC_MMIX_ADDR27, R_MMIX_ADDR27}, 828 {BFD_RELOC_MMIX_REG_OR_BYTE, R_MMIX_REG_OR_BYTE}, 829 {BFD_RELOC_MMIX_REG, R_MMIX_REG}, 830 {BFD_RELOC_MMIX_BASE_PLUS_OFFSET, R_MMIX_BASE_PLUS_OFFSET}, 831 {BFD_RELOC_MMIX_LOCAL, R_MMIX_LOCAL}, 832 {BFD_RELOC_MMIX_PUSHJ_STUBBABLE, R_MMIX_PUSHJ_STUBBABLE} 833 }; 834 835 static reloc_howto_type * 836 bfd_elf64_bfd_reloc_type_lookup (abfd, code) 837 bfd *abfd ATTRIBUTE_UNUSED; 838 bfd_reloc_code_real_type code; 839 { 840 unsigned int i; 841 842 for (i = 0; 843 i < sizeof (mmix_reloc_map) / sizeof (mmix_reloc_map[0]); 844 i++) 845 { 846 if (mmix_reloc_map[i].bfd_reloc_val == code) 847 return &elf_mmix_howto_table[mmix_reloc_map[i].elf_reloc_val]; 848 } 849 850 return NULL; 851 } 852 853 static reloc_howto_type * 854 bfd_elf64_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 855 const char *r_name) 856 { 857 unsigned int i; 858 859 for (i = 0; 860 i < sizeof (elf_mmix_howto_table) / sizeof (elf_mmix_howto_table[0]); 861 i++) 862 if (elf_mmix_howto_table[i].name != NULL 863 && strcasecmp (elf_mmix_howto_table[i].name, r_name) == 0) 864 return &elf_mmix_howto_table[i]; 865 866 return NULL; 867 } 868 869 static bfd_boolean 870 mmix_elf_new_section_hook (abfd, sec) 871 bfd *abfd; 872 asection *sec; 873 { 874 if (!sec->used_by_bfd) 875 { 876 struct _mmix_elf_section_data *sdata; 877 bfd_size_type amt = sizeof (*sdata); 878 879 sdata = bfd_zalloc (abfd, amt); 880 if (sdata == NULL) 881 return FALSE; 882 sec->used_by_bfd = sdata; 883 } 884 885 return _bfd_elf_new_section_hook (abfd, sec); 886 } 887 888 889 /* This function performs the actual bitfiddling and sanity check for a 890 final relocation. Each relocation gets its *worst*-case expansion 891 in size when it arrives here; any reduction in size should have been 892 caught in linker relaxation earlier. When we get here, the relocation 893 looks like the smallest instruction with SWYM:s (nop:s) appended to the 894 max size. We fill in those nop:s. 895 896 R_MMIX_GETA: (FIXME: Relaxation should break this up in 1, 2, 3 tetra) 897 GETA $N,foo 898 -> 899 SETL $N,foo & 0xffff 900 INCML $N,(foo >> 16) & 0xffff 901 INCMH $N,(foo >> 32) & 0xffff 902 INCH $N,(foo >> 48) & 0xffff 903 904 R_MMIX_CBRANCH: (FIXME: Relaxation should break this up, but 905 condbranches needing relaxation might be rare enough to not be 906 worthwhile.) 907 [P]Bcc $N,foo 908 -> 909 [~P]B~cc $N,.+20 910 SETL $255,foo & ... 911 INCML ... 912 INCMH ... 913 INCH ... 914 GO $255,$255,0 915 916 R_MMIX_PUSHJ: (FIXME: Relaxation...) 917 PUSHJ $N,foo 918 -> 919 SETL $255,foo & ... 920 INCML ... 921 INCMH ... 922 INCH ... 923 PUSHGO $N,$255,0 924 925 R_MMIX_JMP: (FIXME: Relaxation...) 926 JMP foo 927 -> 928 SETL $255,foo & ... 929 INCML ... 930 INCMH ... 931 INCH ... 932 GO $255,$255,0 933 934 R_MMIX_ADDR19 and R_MMIX_ADDR27 are just filled in. */ 935 936 static bfd_reloc_status_type 937 mmix_elf_perform_relocation (isec, howto, datap, addr, value) 938 asection *isec; 939 reloc_howto_type *howto; 940 PTR datap; 941 bfd_vma addr; 942 bfd_vma value; 943 { 944 bfd *abfd = isec->owner; 945 bfd_reloc_status_type flag = bfd_reloc_ok; 946 bfd_reloc_status_type r; 947 int offs = 0; 948 int reg = 255; 949 950 /* The worst case bits are all similar SETL/INCML/INCMH/INCH sequences. 951 We handle the differences here and the common sequence later. */ 952 switch (howto->type) 953 { 954 case R_MMIX_GETA: 955 offs = 0; 956 reg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 957 958 /* We change to an absolute value. */ 959 value += addr; 960 break; 961 962 case R_MMIX_CBRANCH: 963 { 964 int in1 = bfd_get_16 (abfd, (bfd_byte *) datap) << 16; 965 966 /* Invert the condition and prediction bit, and set the offset 967 to five instructions ahead. 968 969 We *can* do better if we want to. If the branch is found to be 970 within limits, we could leave the branch as is; there'll just 971 be a bunch of NOP:s after it. But we shouldn't see this 972 sequence often enough that it's worth doing it. */ 973 974 bfd_put_32 (abfd, 975 (((in1 ^ ((PRED_INV_BIT | COND_INV_BIT) << 24)) & ~0xffff) 976 | (24/4)), 977 (bfd_byte *) datap); 978 979 /* Put a "GO $255,$255,0" after the common sequence. */ 980 bfd_put_32 (abfd, 981 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) | 0xffff00, 982 (bfd_byte *) datap + 20); 983 984 /* Common sequence starts at offset 4. */ 985 offs = 4; 986 987 /* We change to an absolute value. */ 988 value += addr; 989 } 990 break; 991 992 case R_MMIX_PUSHJ_STUBBABLE: 993 /* If the address fits, we're fine. */ 994 if ((value & 3) == 0 995 /* Note rightshift 0; see R_MMIX_JMP case below. */ 996 && (r = bfd_check_overflow (complain_overflow_signed, 997 howto->bitsize, 998 0, 999 bfd_arch_bits_per_address (abfd), 1000 value)) == bfd_reloc_ok) 1001 goto pcrel_mmix_reloc_fits; 1002 else 1003 { 1004 bfd_size_type size = isec->rawsize ? isec->rawsize : isec->size; 1005 1006 /* We have the bytes at the PUSHJ insn and need to get the 1007 position for the stub. There's supposed to be room allocated 1008 for the stub. */ 1009 bfd_byte *stubcontents 1010 = ((bfd_byte *) datap 1011 - (addr - (isec->output_section->vma + isec->output_offset)) 1012 + size 1013 + mmix_elf_section_data (isec)->pjs.stub_offset); 1014 bfd_vma stubaddr; 1015 1016 /* The address doesn't fit, so redirect the PUSHJ to the 1017 location of the stub. */ 1018 r = mmix_elf_perform_relocation (isec, 1019 &elf_mmix_howto_table 1020 [R_MMIX_ADDR19], 1021 datap, 1022 addr, 1023 isec->output_section->vma 1024 + isec->output_offset 1025 + size 1026 + (mmix_elf_section_data (isec) 1027 ->pjs.stub_offset) 1028 - addr); 1029 if (r != bfd_reloc_ok) 1030 return r; 1031 1032 stubaddr 1033 = (isec->output_section->vma 1034 + isec->output_offset 1035 + size 1036 + mmix_elf_section_data (isec)->pjs.stub_offset); 1037 1038 /* We generate a simple JMP if that suffices, else the whole 5 1039 insn stub. */ 1040 if (bfd_check_overflow (complain_overflow_signed, 1041 elf_mmix_howto_table[R_MMIX_ADDR27].bitsize, 1042 0, 1043 bfd_arch_bits_per_address (abfd), 1044 addr + value - stubaddr) == bfd_reloc_ok) 1045 { 1046 bfd_put_32 (abfd, JMP_INSN_BYTE << 24, stubcontents); 1047 r = mmix_elf_perform_relocation (isec, 1048 &elf_mmix_howto_table 1049 [R_MMIX_ADDR27], 1050 stubcontents, 1051 stubaddr, 1052 value + addr - stubaddr); 1053 mmix_elf_section_data (isec)->pjs.stub_offset += 4; 1054 1055 if (size + mmix_elf_section_data (isec)->pjs.stub_offset 1056 > isec->size) 1057 abort (); 1058 1059 return r; 1060 } 1061 else 1062 { 1063 /* Put a "GO $255,0" after the common sequence. */ 1064 bfd_put_32 (abfd, 1065 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1066 | 0xff00, (bfd_byte *) stubcontents + 16); 1067 1068 /* Prepare for the general code to set the first part of the 1069 linker stub, and */ 1070 value += addr; 1071 datap = stubcontents; 1072 mmix_elf_section_data (isec)->pjs.stub_offset 1073 += MAX_PUSHJ_STUB_SIZE; 1074 } 1075 } 1076 break; 1077 1078 case R_MMIX_PUSHJ: 1079 { 1080 int inreg = bfd_get_8 (abfd, (bfd_byte *) datap + 1); 1081 1082 /* Put a "PUSHGO $N,$255,0" after the common sequence. */ 1083 bfd_put_32 (abfd, 1084 ((PUSHGO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1085 | (inreg << 16) 1086 | 0xff00, 1087 (bfd_byte *) datap + 16); 1088 1089 /* We change to an absolute value. */ 1090 value += addr; 1091 } 1092 break; 1093 1094 case R_MMIX_JMP: 1095 /* This one is a little special. If we get here on a non-relaxing 1096 link, and the destination is actually in range, we don't need to 1097 execute the nops. 1098 If so, we fall through to the bit-fiddling relocs. 1099 1100 FIXME: bfd_check_overflow seems broken; the relocation is 1101 rightshifted before testing, so supply a zero rightshift. */ 1102 1103 if (! ((value & 3) == 0 1104 && (r = bfd_check_overflow (complain_overflow_signed, 1105 howto->bitsize, 1106 0, 1107 bfd_arch_bits_per_address (abfd), 1108 value)) == bfd_reloc_ok)) 1109 { 1110 /* If the relocation doesn't fit in a JMP, we let the NOP:s be 1111 modified below, and put a "GO $255,$255,0" after the 1112 address-loading sequence. */ 1113 bfd_put_32 (abfd, 1114 ((GO_INSN_BYTE | IMM_OFFSET_BIT) << 24) 1115 | 0xffff00, 1116 (bfd_byte *) datap + 16); 1117 1118 /* We change to an absolute value. */ 1119 value += addr; 1120 break; 1121 } 1122 /* FALLTHROUGH. */ 1123 case R_MMIX_ADDR19: 1124 case R_MMIX_ADDR27: 1125 pcrel_mmix_reloc_fits: 1126 /* These must be in range, or else we emit an error. */ 1127 if ((value & 3) == 0 1128 /* Note rightshift 0; see above. */ 1129 && (r = bfd_check_overflow (complain_overflow_signed, 1130 howto->bitsize, 1131 0, 1132 bfd_arch_bits_per_address (abfd), 1133 value)) == bfd_reloc_ok) 1134 { 1135 bfd_vma in1 1136 = bfd_get_32 (abfd, (bfd_byte *) datap); 1137 bfd_vma highbit; 1138 1139 if ((bfd_signed_vma) value < 0) 1140 { 1141 highbit = 1 << 24; 1142 value += (1 << (howto->bitsize - 1)); 1143 } 1144 else 1145 highbit = 0; 1146 1147 value >>= 2; 1148 1149 bfd_put_32 (abfd, 1150 (in1 & howto->src_mask) 1151 | highbit 1152 | (value & howto->dst_mask), 1153 (bfd_byte *) datap); 1154 1155 return bfd_reloc_ok; 1156 } 1157 else 1158 return bfd_reloc_overflow; 1159 1160 case R_MMIX_BASE_PLUS_OFFSET: 1161 { 1162 struct bpo_reloc_section_info *bpodata 1163 = mmix_elf_section_data (isec)->bpo.reloc; 1164 asection *bpo_greg_section 1165 = bpodata->bpo_greg_section; 1166 struct bpo_greg_section_info *gregdata 1167 = mmix_elf_section_data (bpo_greg_section)->bpo.greg; 1168 size_t bpo_index 1169 = gregdata->bpo_reloc_indexes[bpodata->bpo_index++]; 1170 1171 /* A consistency check: The value we now have in "relocation" must 1172 be the same as the value we stored for that relocation. It 1173 doesn't cost much, so can be left in at all times. */ 1174 if (value != gregdata->reloc_request[bpo_index].value) 1175 { 1176 (*_bfd_error_handler) 1177 (_("%s: Internal inconsistency error for value for\n\ 1178 linker-allocated global register: linked: 0x%lx%08lx != relaxed: 0x%lx%08lx\n"), 1179 bfd_get_filename (isec->owner), 1180 (unsigned long) (value >> 32), (unsigned long) value, 1181 (unsigned long) (gregdata->reloc_request[bpo_index].value 1182 >> 32), 1183 (unsigned long) gregdata->reloc_request[bpo_index].value); 1184 bfd_set_error (bfd_error_bad_value); 1185 return bfd_reloc_overflow; 1186 } 1187 1188 /* Then store the register number and offset for that register 1189 into datap and datap + 1 respectively. */ 1190 bfd_put_8 (abfd, 1191 gregdata->reloc_request[bpo_index].regindex 1192 + bpo_greg_section->output_section->vma / 8, 1193 datap); 1194 bfd_put_8 (abfd, 1195 gregdata->reloc_request[bpo_index].offset, 1196 ((unsigned char *) datap) + 1); 1197 return bfd_reloc_ok; 1198 } 1199 1200 case R_MMIX_REG_OR_BYTE: 1201 case R_MMIX_REG: 1202 if (value > 255) 1203 return bfd_reloc_overflow; 1204 bfd_put_8 (abfd, value, datap); 1205 return bfd_reloc_ok; 1206 1207 default: 1208 BAD_CASE (howto->type); 1209 } 1210 1211 /* This code adds the common SETL/INCML/INCMH/INCH worst-case 1212 sequence. */ 1213 1214 /* Lowest two bits must be 0. We return bfd_reloc_overflow for 1215 everything that looks strange. */ 1216 if (value & 3) 1217 flag = bfd_reloc_overflow; 1218 1219 bfd_put_32 (abfd, 1220 (SETL_INSN_BYTE << 24) | (value & 0xffff) | (reg << 16), 1221 (bfd_byte *) datap + offs); 1222 bfd_put_32 (abfd, 1223 (INCML_INSN_BYTE << 24) | ((value >> 16) & 0xffff) | (reg << 16), 1224 (bfd_byte *) datap + offs + 4); 1225 bfd_put_32 (abfd, 1226 (INCMH_INSN_BYTE << 24) | ((value >> 32) & 0xffff) | (reg << 16), 1227 (bfd_byte *) datap + offs + 8); 1228 bfd_put_32 (abfd, 1229 (INCH_INSN_BYTE << 24) | ((value >> 48) & 0xffff) | (reg << 16), 1230 (bfd_byte *) datap + offs + 12); 1231 1232 return flag; 1233 } 1234 1235 /* Set the howto pointer for an MMIX ELF reloc (type RELA). */ 1236 1237 static void 1238 mmix_info_to_howto_rela (abfd, cache_ptr, dst) 1239 bfd *abfd ATTRIBUTE_UNUSED; 1240 arelent *cache_ptr; 1241 Elf_Internal_Rela *dst; 1242 { 1243 unsigned int r_type; 1244 1245 r_type = ELF64_R_TYPE (dst->r_info); 1246 BFD_ASSERT (r_type < (unsigned int) R_MMIX_max); 1247 cache_ptr->howto = &elf_mmix_howto_table[r_type]; 1248 } 1249 1250 /* Any MMIX-specific relocation gets here at assembly time or when linking 1251 to other formats (such as mmo); this is the relocation function from 1252 the reloc_table. We don't get here for final pure ELF linking. */ 1253 1254 static bfd_reloc_status_type 1255 mmix_elf_reloc (abfd, reloc_entry, symbol, data, input_section, 1256 output_bfd, error_message) 1257 bfd *abfd; 1258 arelent *reloc_entry; 1259 asymbol *symbol; 1260 PTR data; 1261 asection *input_section; 1262 bfd *output_bfd; 1263 char **error_message ATTRIBUTE_UNUSED; 1264 { 1265 bfd_vma relocation; 1266 bfd_reloc_status_type r; 1267 asection *reloc_target_output_section; 1268 bfd_reloc_status_type flag = bfd_reloc_ok; 1269 bfd_vma output_base = 0; 1270 bfd_vma addr; 1271 1272 r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 1273 input_section, output_bfd, error_message); 1274 1275 /* If that was all that was needed (i.e. this isn't a final link, only 1276 some segment adjustments), we're done. */ 1277 if (r != bfd_reloc_continue) 1278 return r; 1279 1280 if (bfd_is_und_section (symbol->section) 1281 && (symbol->flags & BSF_WEAK) == 0 1282 && output_bfd == (bfd *) NULL) 1283 return bfd_reloc_undefined; 1284 1285 /* Is the address of the relocation really within the section? */ 1286 if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) 1287 return bfd_reloc_outofrange; 1288 1289 /* Work out which section the relocation is targeted at and the 1290 initial relocation command value. */ 1291 1292 /* Get symbol value. (Common symbols are special.) */ 1293 if (bfd_is_com_section (symbol->section)) 1294 relocation = 0; 1295 else 1296 relocation = symbol->value; 1297 1298 reloc_target_output_section = bfd_get_output_section (symbol); 1299 1300 /* Here the variable relocation holds the final address of the symbol we 1301 are relocating against, plus any addend. */ 1302 if (output_bfd) 1303 output_base = 0; 1304 else 1305 output_base = reloc_target_output_section->vma; 1306 1307 relocation += output_base + symbol->section->output_offset; 1308 1309 /* Get position of relocation. */ 1310 addr = (reloc_entry->address + input_section->output_section->vma 1311 + input_section->output_offset); 1312 if (output_bfd != (bfd *) NULL) 1313 { 1314 /* Add in supplied addend. */ 1315 relocation += reloc_entry->addend; 1316 1317 /* This is a partial relocation, and we want to apply the 1318 relocation to the reloc entry rather than the raw data. 1319 Modify the reloc inplace to reflect what we now know. */ 1320 reloc_entry->addend = relocation; 1321 reloc_entry->address += input_section->output_offset; 1322 return flag; 1323 } 1324 1325 return mmix_final_link_relocate (reloc_entry->howto, input_section, 1326 data, reloc_entry->address, 1327 reloc_entry->addend, relocation, 1328 bfd_asymbol_name (symbol), 1329 reloc_target_output_section); 1330 } 1331 1332 /* Relocate an MMIX ELF section. Modified from elf32-fr30.c; look to it 1334 for guidance if you're thinking of copying this. */ 1335 1336 static bfd_boolean 1337 mmix_elf_relocate_section (output_bfd, info, input_bfd, input_section, 1338 contents, relocs, local_syms, local_sections) 1339 bfd *output_bfd ATTRIBUTE_UNUSED; 1340 struct bfd_link_info *info; 1341 bfd *input_bfd; 1342 asection *input_section; 1343 bfd_byte *contents; 1344 Elf_Internal_Rela *relocs; 1345 Elf_Internal_Sym *local_syms; 1346 asection **local_sections; 1347 { 1348 Elf_Internal_Shdr *symtab_hdr; 1349 struct elf_link_hash_entry **sym_hashes; 1350 Elf_Internal_Rela *rel; 1351 Elf_Internal_Rela *relend; 1352 bfd_size_type size; 1353 size_t pjsno = 0; 1354 1355 size = input_section->rawsize ? input_section->rawsize : input_section->size; 1356 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1357 sym_hashes = elf_sym_hashes (input_bfd); 1358 relend = relocs + input_section->reloc_count; 1359 1360 /* Zero the stub area before we start. */ 1361 if (input_section->rawsize != 0 1362 && input_section->size > input_section->rawsize) 1363 memset (contents + input_section->rawsize, 0, 1364 input_section->size - input_section->rawsize); 1365 1366 for (rel = relocs; rel < relend; rel ++) 1367 { 1368 reloc_howto_type *howto; 1369 unsigned long r_symndx; 1370 Elf_Internal_Sym *sym; 1371 asection *sec; 1372 struct elf_link_hash_entry *h; 1373 bfd_vma relocation; 1374 bfd_reloc_status_type r; 1375 const char *name = NULL; 1376 int r_type; 1377 bfd_boolean undefined_signalled = FALSE; 1378 1379 r_type = ELF64_R_TYPE (rel->r_info); 1380 1381 if (r_type == R_MMIX_GNU_VTINHERIT 1382 || r_type == R_MMIX_GNU_VTENTRY) 1383 continue; 1384 1385 r_symndx = ELF64_R_SYM (rel->r_info); 1386 1387 howto = elf_mmix_howto_table + ELF64_R_TYPE (rel->r_info); 1388 h = NULL; 1389 sym = NULL; 1390 sec = NULL; 1391 1392 if (r_symndx < symtab_hdr->sh_info) 1393 { 1394 sym = local_syms + r_symndx; 1395 sec = local_sections [r_symndx]; 1396 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1397 1398 name = bfd_elf_string_from_elf_section (input_bfd, 1399 symtab_hdr->sh_link, 1400 sym->st_name); 1401 if (name == NULL) 1402 name = bfd_section_name (input_bfd, sec); 1403 } 1404 else 1405 { 1406 bfd_boolean unresolved_reloc; 1407 1408 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1409 r_symndx, symtab_hdr, sym_hashes, 1410 h, sec, relocation, 1411 unresolved_reloc, undefined_signalled); 1412 name = h->root.root.string; 1413 } 1414 1415 if (sec != NULL && elf_discarded_section (sec)) 1416 { 1417 /* For relocs against symbols from removed linkonce sections, 1418 or sections discarded by a linker script, we just want the 1419 section contents zeroed. Avoid any special processing. */ 1420 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); 1421 rel->r_info = 0; 1422 rel->r_addend = 0; 1423 continue; 1424 } 1425 1426 if (info->relocatable) 1427 { 1428 /* This is a relocatable link. For most relocs we don't have to 1429 change anything, unless the reloc is against a section 1430 symbol, in which case we have to adjust according to where 1431 the section symbol winds up in the output section. */ 1432 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 1433 rel->r_addend += sec->output_offset; 1434 1435 /* For PUSHJ stub relocs however, we may need to change the 1436 reloc and the section contents, if the reloc doesn't reach 1437 beyond the end of the output section and previous stubs. 1438 Then we change the section contents to be a PUSHJ to the end 1439 of the input section plus stubs (we can do that without using 1440 a reloc), and then we change the reloc to be a R_MMIX_PUSHJ 1441 at the stub location. */ 1442 if (r_type == R_MMIX_PUSHJ_STUBBABLE) 1443 { 1444 /* We've already checked whether we need a stub; use that 1445 knowledge. */ 1446 if (mmix_elf_section_data (input_section)->pjs.stub_size[pjsno] 1447 != 0) 1448 { 1449 Elf_Internal_Rela relcpy; 1450 1451 if (mmix_elf_section_data (input_section) 1452 ->pjs.stub_size[pjsno] != MAX_PUSHJ_STUB_SIZE) 1453 abort (); 1454 1455 /* There's already a PUSHJ insn there, so just fill in 1456 the offset bits to the stub. */ 1457 if (mmix_final_link_relocate (elf_mmix_howto_table 1458 + R_MMIX_ADDR19, 1459 input_section, 1460 contents, 1461 rel->r_offset, 1462 0, 1463 input_section 1464 ->output_section->vma 1465 + input_section->output_offset 1466 + size 1467 + mmix_elf_section_data (input_section) 1468 ->pjs.stub_offset, 1469 NULL, NULL) != bfd_reloc_ok) 1470 return FALSE; 1471 1472 /* Put a JMP insn at the stub; it goes with the 1473 R_MMIX_JMP reloc. */ 1474 bfd_put_32 (output_bfd, JMP_INSN_BYTE << 24, 1475 contents 1476 + size 1477 + mmix_elf_section_data (input_section) 1478 ->pjs.stub_offset); 1479 1480 /* Change the reloc to be at the stub, and to a full 1481 R_MMIX_JMP reloc. */ 1482 rel->r_info = ELF64_R_INFO (r_symndx, R_MMIX_JMP); 1483 rel->r_offset 1484 = (size 1485 + mmix_elf_section_data (input_section) 1486 ->pjs.stub_offset); 1487 1488 mmix_elf_section_data (input_section)->pjs.stub_offset 1489 += MAX_PUSHJ_STUB_SIZE; 1490 1491 /* Shift this reloc to the end of the relocs to maintain 1492 the r_offset sorted reloc order. */ 1493 relcpy = *rel; 1494 memmove (rel, rel + 1, (char *) relend - (char *) rel); 1495 relend[-1] = relcpy; 1496 1497 /* Back up one reloc, or else we'd skip the next reloc 1498 in turn. */ 1499 rel--; 1500 } 1501 1502 pjsno++; 1503 } 1504 continue; 1505 } 1506 1507 r = mmix_final_link_relocate (howto, input_section, 1508 contents, rel->r_offset, 1509 rel->r_addend, relocation, name, sec); 1510 1511 if (r != bfd_reloc_ok) 1512 { 1513 bfd_boolean check_ok = TRUE; 1514 const char * msg = (const char *) NULL; 1515 1516 switch (r) 1517 { 1518 case bfd_reloc_overflow: 1519 check_ok = info->callbacks->reloc_overflow 1520 (info, (h ? &h->root : NULL), name, howto->name, 1521 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1522 break; 1523 1524 case bfd_reloc_undefined: 1525 /* We may have sent this message above. */ 1526 if (! undefined_signalled) 1527 check_ok = info->callbacks->undefined_symbol 1528 (info, name, input_bfd, input_section, rel->r_offset, 1529 TRUE); 1530 undefined_signalled = TRUE; 1531 break; 1532 1533 case bfd_reloc_outofrange: 1534 msg = _("internal error: out of range error"); 1535 break; 1536 1537 case bfd_reloc_notsupported: 1538 msg = _("internal error: unsupported relocation error"); 1539 break; 1540 1541 case bfd_reloc_dangerous: 1542 msg = _("internal error: dangerous relocation"); 1543 break; 1544 1545 default: 1546 msg = _("internal error: unknown error"); 1547 break; 1548 } 1549 1550 if (msg) 1551 check_ok = info->callbacks->warning 1552 (info, msg, name, input_bfd, input_section, rel->r_offset); 1553 1554 if (! check_ok) 1555 return FALSE; 1556 } 1557 } 1558 1559 return TRUE; 1560 } 1561 1562 /* Perform a single relocation. By default we use the standard BFD 1564 routines. A few relocs we have to do ourselves. */ 1565 1566 static bfd_reloc_status_type 1567 mmix_final_link_relocate (howto, input_section, contents, 1568 r_offset, r_addend, relocation, symname, symsec) 1569 reloc_howto_type *howto; 1570 asection *input_section; 1571 bfd_byte *contents; 1572 bfd_vma r_offset; 1573 bfd_signed_vma r_addend; 1574 bfd_vma relocation; 1575 const char *symname; 1576 asection *symsec; 1577 { 1578 bfd_reloc_status_type r = bfd_reloc_ok; 1579 bfd_vma addr 1580 = (input_section->output_section->vma 1581 + input_section->output_offset 1582 + r_offset); 1583 bfd_signed_vma srel 1584 = (bfd_signed_vma) relocation + r_addend; 1585 1586 switch (howto->type) 1587 { 1588 /* All these are PC-relative. */ 1589 case R_MMIX_PUSHJ_STUBBABLE: 1590 case R_MMIX_PUSHJ: 1591 case R_MMIX_CBRANCH: 1592 case R_MMIX_ADDR19: 1593 case R_MMIX_GETA: 1594 case R_MMIX_ADDR27: 1595 case R_MMIX_JMP: 1596 contents += r_offset; 1597 1598 srel -= (input_section->output_section->vma 1599 + input_section->output_offset 1600 + r_offset); 1601 1602 r = mmix_elf_perform_relocation (input_section, howto, contents, 1603 addr, srel); 1604 break; 1605 1606 case R_MMIX_BASE_PLUS_OFFSET: 1607 if (symsec == NULL) 1608 return bfd_reloc_undefined; 1609 1610 /* Check that we're not relocating against a register symbol. */ 1611 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1612 MMIX_REG_CONTENTS_SECTION_NAME) == 0 1613 || strcmp (bfd_get_section_name (symsec->owner, symsec), 1614 MMIX_REG_SECTION_NAME) == 0) 1615 { 1616 /* Note: This is separated out into two messages in order 1617 to ease the translation into other languages. */ 1618 if (symname == NULL || *symname == 0) 1619 (*_bfd_error_handler) 1620 (_("%s: base-plus-offset relocation against register symbol: (unknown) in %s"), 1621 bfd_get_filename (input_section->owner), 1622 bfd_get_section_name (symsec->owner, symsec)); 1623 else 1624 (*_bfd_error_handler) 1625 (_("%s: base-plus-offset relocation against register symbol: %s in %s"), 1626 bfd_get_filename (input_section->owner), symname, 1627 bfd_get_section_name (symsec->owner, symsec)); 1628 return bfd_reloc_overflow; 1629 } 1630 goto do_mmix_reloc; 1631 1632 case R_MMIX_REG_OR_BYTE: 1633 case R_MMIX_REG: 1634 /* For now, we handle these alike. They must refer to an register 1635 symbol, which is either relative to the register section and in 1636 the range 0..255, or is in the register contents section with vma 1637 regno * 8. */ 1638 1639 /* FIXME: A better way to check for reg contents section? 1640 FIXME: Postpone section->scaling to mmix_elf_perform_relocation? */ 1641 if (symsec == NULL) 1642 return bfd_reloc_undefined; 1643 1644 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1645 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1646 { 1647 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1648 { 1649 /* The bfd_reloc_outofrange return value, though intuitively 1650 a better value, will not get us an error. */ 1651 return bfd_reloc_overflow; 1652 } 1653 srel /= 8; 1654 } 1655 else if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1656 MMIX_REG_SECTION_NAME) == 0) 1657 { 1658 if (srel < 0 || srel > 255) 1659 /* The bfd_reloc_outofrange return value, though intuitively a 1660 better value, will not get us an error. */ 1661 return bfd_reloc_overflow; 1662 } 1663 else 1664 { 1665 /* Note: This is separated out into two messages in order 1666 to ease the translation into other languages. */ 1667 if (symname == NULL || *symname == 0) 1668 (*_bfd_error_handler) 1669 (_("%s: register relocation against non-register symbol: (unknown) in %s"), 1670 bfd_get_filename (input_section->owner), 1671 bfd_get_section_name (symsec->owner, symsec)); 1672 else 1673 (*_bfd_error_handler) 1674 (_("%s: register relocation against non-register symbol: %s in %s"), 1675 bfd_get_filename (input_section->owner), symname, 1676 bfd_get_section_name (symsec->owner, symsec)); 1677 1678 /* The bfd_reloc_outofrange return value, though intuitively a 1679 better value, will not get us an error. */ 1680 return bfd_reloc_overflow; 1681 } 1682 do_mmix_reloc: 1683 contents += r_offset; 1684 r = mmix_elf_perform_relocation (input_section, howto, contents, 1685 addr, srel); 1686 break; 1687 1688 case R_MMIX_LOCAL: 1689 /* This isn't a real relocation, it's just an assertion that the 1690 final relocation value corresponds to a local register. We 1691 ignore the actual relocation; nothing is changed. */ 1692 { 1693 asection *regsec 1694 = bfd_get_section_by_name (input_section->output_section->owner, 1695 MMIX_REG_CONTENTS_SECTION_NAME); 1696 bfd_vma first_global; 1697 1698 /* Check that this is an absolute value, or a reference to the 1699 register contents section or the register (symbol) section. 1700 Absolute numbers can get here as undefined section. Undefined 1701 symbols are signalled elsewhere, so there's no conflict in us 1702 accidentally handling it. */ 1703 if (!bfd_is_abs_section (symsec) 1704 && !bfd_is_und_section (symsec) 1705 && strcmp (bfd_get_section_name (symsec->owner, symsec), 1706 MMIX_REG_CONTENTS_SECTION_NAME) != 0 1707 && strcmp (bfd_get_section_name (symsec->owner, symsec), 1708 MMIX_REG_SECTION_NAME) != 0) 1709 { 1710 (*_bfd_error_handler) 1711 (_("%s: directive LOCAL valid only with a register or absolute value"), 1712 bfd_get_filename (input_section->owner)); 1713 1714 return bfd_reloc_overflow; 1715 } 1716 1717 /* If we don't have a register contents section, then $255 is the 1718 first global register. */ 1719 if (regsec == NULL) 1720 first_global = 255; 1721 else 1722 { 1723 first_global = bfd_get_section_vma (abfd, regsec) / 8; 1724 if (strcmp (bfd_get_section_name (symsec->owner, symsec), 1725 MMIX_REG_CONTENTS_SECTION_NAME) == 0) 1726 { 1727 if ((srel & 7) != 0 || srel < 32*8 || srel > 255*8) 1728 /* The bfd_reloc_outofrange return value, though 1729 intuitively a better value, will not get us an error. */ 1730 return bfd_reloc_overflow; 1731 srel /= 8; 1732 } 1733 } 1734 1735 if ((bfd_vma) srel >= first_global) 1736 { 1737 /* FIXME: Better error message. */ 1738 (*_bfd_error_handler) 1739 (_("%s: LOCAL directive: Register $%ld is not a local register. First global register is $%ld."), 1740 bfd_get_filename (input_section->owner), (long) srel, (long) first_global); 1741 1742 return bfd_reloc_overflow; 1743 } 1744 } 1745 r = bfd_reloc_ok; 1746 break; 1747 1748 default: 1749 r = _bfd_final_link_relocate (howto, input_section->owner, input_section, 1750 contents, r_offset, 1751 relocation, r_addend); 1752 } 1753 1754 return r; 1755 } 1756 1757 /* Return the section that should be marked against GC for a given 1759 relocation. */ 1760 1761 static asection * 1762 mmix_elf_gc_mark_hook (asection *sec, 1763 struct bfd_link_info *info, 1764 Elf_Internal_Rela *rel, 1765 struct elf_link_hash_entry *h, 1766 Elf_Internal_Sym *sym) 1767 { 1768 if (h != NULL) 1769 switch (ELF64_R_TYPE (rel->r_info)) 1770 { 1771 case R_MMIX_GNU_VTINHERIT: 1772 case R_MMIX_GNU_VTENTRY: 1773 return NULL; 1774 } 1775 1776 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1777 } 1778 1779 /* Update relocation info for a GC-excluded section. We could supposedly 1780 perform the allocation after GC, but there's no suitable hook between 1781 GC (or section merge) and the point when all input sections must be 1782 present. Better to waste some memory and (perhaps) a little time. */ 1783 1784 static bfd_boolean 1785 mmix_elf_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED, 1786 struct bfd_link_info *info ATTRIBUTE_UNUSED, 1787 asection *sec, 1788 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED) 1789 { 1790 struct bpo_reloc_section_info *bpodata 1791 = mmix_elf_section_data (sec)->bpo.reloc; 1792 asection *allocated_gregs_section; 1793 1794 /* If no bpodata here, we have nothing to do. */ 1795 if (bpodata == NULL) 1796 return TRUE; 1797 1798 allocated_gregs_section = bpodata->bpo_greg_section; 1799 1800 mmix_elf_section_data (allocated_gregs_section)->bpo.greg->n_bpo_relocs 1801 -= bpodata->n_bpo_relocs_this_section; 1802 1803 return TRUE; 1804 } 1805 1806 /* Sort register relocs to come before expanding relocs. */ 1808 1809 static int 1810 mmix_elf_sort_relocs (p1, p2) 1811 const PTR p1; 1812 const PTR p2; 1813 { 1814 const Elf_Internal_Rela *r1 = (const Elf_Internal_Rela *) p1; 1815 const Elf_Internal_Rela *r2 = (const Elf_Internal_Rela *) p2; 1816 int r1_is_reg, r2_is_reg; 1817 1818 /* Sort primarily on r_offset & ~3, so relocs are done to consecutive 1819 insns. */ 1820 if ((r1->r_offset & ~(bfd_vma) 3) > (r2->r_offset & ~(bfd_vma) 3)) 1821 return 1; 1822 else if ((r1->r_offset & ~(bfd_vma) 3) < (r2->r_offset & ~(bfd_vma) 3)) 1823 return -1; 1824 1825 r1_is_reg 1826 = (ELF64_R_TYPE (r1->r_info) == R_MMIX_REG_OR_BYTE 1827 || ELF64_R_TYPE (r1->r_info) == R_MMIX_REG); 1828 r2_is_reg 1829 = (ELF64_R_TYPE (r2->r_info) == R_MMIX_REG_OR_BYTE 1830 || ELF64_R_TYPE (r2->r_info) == R_MMIX_REG); 1831 if (r1_is_reg != r2_is_reg) 1832 return r2_is_reg - r1_is_reg; 1833 1834 /* Neither or both are register relocs. Then sort on full offset. */ 1835 if (r1->r_offset > r2->r_offset) 1836 return 1; 1837 else if (r1->r_offset < r2->r_offset) 1838 return -1; 1839 return 0; 1840 } 1841 1842 /* Subset of mmix_elf_check_relocs, common to ELF and mmo linking. */ 1843 1844 static bfd_boolean 1845 mmix_elf_check_common_relocs (abfd, info, sec, relocs) 1846 bfd *abfd; 1847 struct bfd_link_info *info; 1848 asection *sec; 1849 const Elf_Internal_Rela *relocs; 1850 { 1851 bfd *bpo_greg_owner = NULL; 1852 asection *allocated_gregs_section = NULL; 1853 struct bpo_greg_section_info *gregdata = NULL; 1854 struct bpo_reloc_section_info *bpodata = NULL; 1855 const Elf_Internal_Rela *rel; 1856 const Elf_Internal_Rela *rel_end; 1857 1858 /* We currently have to abuse this COFF-specific member, since there's 1859 no target-machine-dedicated member. There's no alternative outside 1860 the bfd_link_info struct; we can't specialize a hash-table since 1861 they're different between ELF and mmo. */ 1862 bpo_greg_owner = (bfd *) info->base_file; 1863 1864 rel_end = relocs + sec->reloc_count; 1865 for (rel = relocs; rel < rel_end; rel++) 1866 { 1867 switch (ELF64_R_TYPE (rel->r_info)) 1868 { 1869 /* This relocation causes a GREG allocation. We need to count 1870 them, and we need to create a section for them, so we need an 1871 object to fake as the owner of that section. We can't use 1872 the ELF dynobj for this, since the ELF bits assume lots of 1873 DSO-related stuff if that member is non-NULL. */ 1874 case R_MMIX_BASE_PLUS_OFFSET: 1875 /* We don't do anything with this reloc for a relocatable link. */ 1876 if (info->relocatable) 1877 break; 1878 1879 if (bpo_greg_owner == NULL) 1880 { 1881 bpo_greg_owner = abfd; 1882 info->base_file = (PTR) bpo_greg_owner; 1883 } 1884 1885 if (allocated_gregs_section == NULL) 1886 allocated_gregs_section 1887 = bfd_get_section_by_name (bpo_greg_owner, 1888 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 1889 1890 if (allocated_gregs_section == NULL) 1891 { 1892 allocated_gregs_section 1893 = bfd_make_section_with_flags (bpo_greg_owner, 1894 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME, 1895 (SEC_HAS_CONTENTS 1896 | SEC_IN_MEMORY 1897 | SEC_LINKER_CREATED)); 1898 /* Setting both SEC_ALLOC and SEC_LOAD means the section is 1899 treated like any other section, and we'd get errors for 1900 address overlap with the text section. Let's set none of 1901 those flags, as that is what currently happens for usual 1902 GREG allocations, and that works. */ 1903 if (allocated_gregs_section == NULL 1904 || !bfd_set_section_alignment (bpo_greg_owner, 1905 allocated_gregs_section, 1906 3)) 1907 return FALSE; 1908 1909 gregdata = (struct bpo_greg_section_info *) 1910 bfd_zalloc (bpo_greg_owner, sizeof (struct bpo_greg_section_info)); 1911 if (gregdata == NULL) 1912 return FALSE; 1913 mmix_elf_section_data (allocated_gregs_section)->bpo.greg 1914 = gregdata; 1915 } 1916 else if (gregdata == NULL) 1917 gregdata 1918 = mmix_elf_section_data (allocated_gregs_section)->bpo.greg; 1919 1920 /* Get ourselves some auxiliary info for the BPO-relocs. */ 1921 if (bpodata == NULL) 1922 { 1923 /* No use doing a separate iteration pass to find the upper 1924 limit - just use the number of relocs. */ 1925 bpodata = (struct bpo_reloc_section_info *) 1926 bfd_alloc (bpo_greg_owner, 1927 sizeof (struct bpo_reloc_section_info) 1928 * (sec->reloc_count + 1)); 1929 if (bpodata == NULL) 1930 return FALSE; 1931 mmix_elf_section_data (sec)->bpo.reloc = bpodata; 1932 bpodata->first_base_plus_offset_reloc 1933 = bpodata->bpo_index 1934 = gregdata->n_max_bpo_relocs; 1935 bpodata->bpo_greg_section 1936 = allocated_gregs_section; 1937 bpodata->n_bpo_relocs_this_section = 0; 1938 } 1939 1940 bpodata->n_bpo_relocs_this_section++; 1941 gregdata->n_max_bpo_relocs++; 1942 1943 /* We don't get another chance to set this before GC; we've not 1944 set up any hook that runs before GC. */ 1945 gregdata->n_bpo_relocs 1946 = gregdata->n_max_bpo_relocs; 1947 break; 1948 1949 case R_MMIX_PUSHJ_STUBBABLE: 1950 mmix_elf_section_data (sec)->pjs.n_pushj_relocs++; 1951 break; 1952 } 1953 } 1954 1955 /* Allocate per-reloc stub storage and initialize it to the max stub 1956 size. */ 1957 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs != 0) 1958 { 1959 size_t i; 1960 1961 mmix_elf_section_data (sec)->pjs.stub_size 1962 = bfd_alloc (abfd, mmix_elf_section_data (sec)->pjs.n_pushj_relocs 1963 * sizeof (mmix_elf_section_data (sec) 1964 ->pjs.stub_size[0])); 1965 if (mmix_elf_section_data (sec)->pjs.stub_size == NULL) 1966 return FALSE; 1967 1968 for (i = 0; i < mmix_elf_section_data (sec)->pjs.n_pushj_relocs; i++) 1969 mmix_elf_section_data (sec)->pjs.stub_size[i] = MAX_PUSHJ_STUB_SIZE; 1970 } 1971 1972 return TRUE; 1973 } 1974 1975 /* Look through the relocs for a section during the first phase. */ 1976 1977 static bfd_boolean 1978 mmix_elf_check_relocs (abfd, info, sec, relocs) 1979 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 ((PTR) 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 (info->relocatable) 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 2021 switch (ELF64_R_TYPE (rel->r_info)) 2022 { 2023 /* This relocation describes the C++ object vtable hierarchy. 2024 Reconstruct it for later use during GC. */ 2025 case R_MMIX_GNU_VTINHERIT: 2026 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2027 return FALSE; 2028 break; 2029 2030 /* This relocation describes which C++ vtable entries are actually 2031 used. Record for later use during GC. */ 2032 case R_MMIX_GNU_VTENTRY: 2033 BFD_ASSERT (h != NULL); 2034 if (h != NULL 2035 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2036 return FALSE; 2037 break; 2038 } 2039 } 2040 2041 return TRUE; 2042 } 2043 2044 /* Wrapper for mmix_elf_check_common_relocs, called when linking to mmo. 2045 Copied from elf_link_add_object_symbols. */ 2046 2047 bfd_boolean 2048 _bfd_mmix_check_all_relocs (abfd, info) 2049 bfd *abfd; 2050 struct bfd_link_info *info; 2051 { 2052 asection *o; 2053 2054 for (o = abfd->sections; o != NULL; o = o->next) 2055 { 2056 Elf_Internal_Rela *internal_relocs; 2057 bfd_boolean ok; 2058 2059 if ((o->flags & SEC_RELOC) == 0 2060 || o->reloc_count == 0 2061 || ((info->strip == strip_all || info->strip == strip_debugger) 2062 && (o->flags & SEC_DEBUGGING) != 0) 2063 || bfd_is_abs_section (o->output_section)) 2064 continue; 2065 2066 internal_relocs 2067 = _bfd_elf_link_read_relocs (abfd, o, (PTR) NULL, 2068 (Elf_Internal_Rela *) NULL, 2069 info->keep_memory); 2070 if (internal_relocs == NULL) 2071 return FALSE; 2072 2073 ok = mmix_elf_check_common_relocs (abfd, info, o, internal_relocs); 2074 2075 if (! info->keep_memory) 2076 free (internal_relocs); 2077 2078 if (! ok) 2079 return FALSE; 2080 } 2081 2082 return TRUE; 2083 } 2084 2085 /* Change symbols relative to the reg contents section to instead be to 2087 the register section, and scale them down to correspond to the register 2088 number. */ 2089 2090 static bfd_boolean 2091 mmix_elf_link_output_symbol_hook (info, name, sym, input_sec, h) 2092 struct bfd_link_info *info ATTRIBUTE_UNUSED; 2093 const char *name ATTRIBUTE_UNUSED; 2094 Elf_Internal_Sym *sym; 2095 asection *input_sec; 2096 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED; 2097 { 2098 if (input_sec != NULL 2099 && input_sec->name != NULL 2100 && ELF_ST_TYPE (sym->st_info) != STT_SECTION 2101 && strcmp (input_sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0) 2102 { 2103 sym->st_value /= 8; 2104 sym->st_shndx = SHN_REGISTER; 2105 } 2106 2107 return TRUE; 2108 } 2109 2110 /* We fake a register section that holds values that are register numbers. 2111 Having a SHN_REGISTER and register section translates better to other 2112 formats (e.g. mmo) than for example a STT_REGISTER attribute. 2113 This section faking is based on a construct in elf32-mips.c. */ 2114 static asection mmix_elf_reg_section; 2115 static asymbol mmix_elf_reg_section_symbol; 2116 static asymbol *mmix_elf_reg_section_symbol_ptr; 2117 2118 /* Handle the special section numbers that a symbol may use. */ 2119 2120 void 2121 mmix_elf_symbol_processing (abfd, asym) 2122 bfd *abfd ATTRIBUTE_UNUSED; 2123 asymbol *asym; 2124 { 2125 elf_symbol_type *elfsym; 2126 2127 elfsym = (elf_symbol_type *) asym; 2128 switch (elfsym->internal_elf_sym.st_shndx) 2129 { 2130 case SHN_REGISTER: 2131 if (mmix_elf_reg_section.name == NULL) 2132 { 2133 /* Initialize the register section. */ 2134 mmix_elf_reg_section.name = MMIX_REG_SECTION_NAME; 2135 mmix_elf_reg_section.flags = SEC_NO_FLAGS; 2136 mmix_elf_reg_section.output_section = &mmix_elf_reg_section; 2137 mmix_elf_reg_section.symbol = &mmix_elf_reg_section_symbol; 2138 mmix_elf_reg_section.symbol_ptr_ptr = &mmix_elf_reg_section_symbol_ptr; 2139 mmix_elf_reg_section_symbol.name = MMIX_REG_SECTION_NAME; 2140 mmix_elf_reg_section_symbol.flags = BSF_SECTION_SYM; 2141 mmix_elf_reg_section_symbol.section = &mmix_elf_reg_section; 2142 mmix_elf_reg_section_symbol_ptr = &mmix_elf_reg_section_symbol; 2143 } 2144 asym->section = &mmix_elf_reg_section; 2145 break; 2146 2147 default: 2148 break; 2149 } 2150 } 2151 2152 /* Given a BFD section, try to locate the corresponding ELF section 2153 index. */ 2154 2155 static bfd_boolean 2156 mmix_elf_section_from_bfd_section (abfd, sec, retval) 2157 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 bfd_boolean 2177 mmix_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp) 2178 bfd *abfd; 2179 struct bfd_link_info *info ATTRIBUTE_UNUSED; 2180 Elf_Internal_Sym *sym; 2181 const char **namep ATTRIBUTE_UNUSED; 2182 flagword *flagsp ATTRIBUTE_UNUSED; 2183 asection **secp; 2184 bfd_vma *valp ATTRIBUTE_UNUSED; 2185 { 2186 if (sym->st_shndx == SHN_REGISTER) 2187 { 2188 *secp = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME); 2189 (*secp)->flags |= SEC_LINKER_CREATED; 2190 } 2191 else if ((*namep)[0] == '_' && (*namep)[1] == '_' && (*namep)[2] == '.' 2192 && CONST_STRNEQ (*namep, MMIX_LOC_SECTION_START_SYMBOL_PREFIX)) 2193 { 2194 /* See if we have another one. */ 2195 struct bfd_link_hash_entry *h = bfd_link_hash_lookup (info->hash, 2196 *namep, 2197 FALSE, 2198 FALSE, 2199 FALSE); 2200 2201 if (h != NULL && h->type != bfd_link_hash_undefined) 2202 { 2203 /* How do we get the asymbol (or really: the filename) from h? 2204 h->u.def.section->owner is NULL. */ 2205 ((*_bfd_error_handler) 2206 (_("%s: Error: multiple definition of `%s'; start of %s is set in a earlier linked file\n"), 2207 bfd_get_filename (abfd), *namep, 2208 *namep + strlen (MMIX_LOC_SECTION_START_SYMBOL_PREFIX))); 2209 bfd_set_error (bfd_error_bad_value); 2210 return FALSE; 2211 } 2212 } 2213 2214 return TRUE; 2215 } 2216 2217 /* We consider symbols matching "L.*:[0-9]+" to be local symbols. */ 2218 2219 bfd_boolean 2220 mmix_elf_is_local_label_name (abfd, name) 2221 bfd *abfd; 2222 const char *name; 2223 { 2224 const char *colpos; 2225 int digits; 2226 2227 /* Also include the default local-label definition. */ 2228 if (_bfd_elf_is_local_label_name (abfd, name)) 2229 return TRUE; 2230 2231 if (*name != 'L') 2232 return FALSE; 2233 2234 /* If there's no ":", or more than one, it's not a local symbol. */ 2235 colpos = strchr (name, ':'); 2236 if (colpos == NULL || strchr (colpos + 1, ':') != NULL) 2237 return FALSE; 2238 2239 /* Check that there are remaining characters and that they are digits. */ 2240 if (colpos[1] == 0) 2241 return FALSE; 2242 2243 digits = strspn (colpos + 1, "0123456789"); 2244 return digits != 0 && colpos[1 + digits] == 0; 2245 } 2246 2247 /* We get rid of the register section here. */ 2248 2249 bfd_boolean 2250 mmix_elf_final_link (abfd, info) 2251 bfd *abfd; 2252 struct bfd_link_info *info; 2253 { 2254 /* We never output a register section, though we create one for 2255 temporary measures. Check that nobody entered contents into it. */ 2256 asection *reg_section; 2257 2258 reg_section = bfd_get_section_by_name (abfd, MMIX_REG_SECTION_NAME); 2259 2260 if (reg_section != NULL) 2261 { 2262 /* FIXME: Pass error state gracefully. */ 2263 if (bfd_get_section_flags (abfd, reg_section) & SEC_HAS_CONTENTS) 2264 _bfd_abort (__FILE__, __LINE__, _("Register section has contents\n")); 2265 2266 /* Really remove the section, if it hasn't already been done. */ 2267 if (!bfd_section_removed_from_list (abfd, reg_section)) 2268 { 2269 bfd_section_list_remove (abfd, reg_section); 2270 --abfd->section_count; 2271 } 2272 } 2273 2274 if (! bfd_elf_final_link (abfd, info)) 2275 return FALSE; 2276 2277 /* Since this section is marked SEC_LINKER_CREATED, it isn't output by 2278 the regular linker machinery. We do it here, like other targets with 2279 special sections. */ 2280 if (info->base_file != NULL) 2281 { 2282 asection *greg_section 2283 = bfd_get_section_by_name ((bfd *) info->base_file, 2284 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2285 if (!bfd_set_section_contents (abfd, 2286 greg_section->output_section, 2287 greg_section->contents, 2288 (file_ptr) greg_section->output_offset, 2289 greg_section->size)) 2290 return FALSE; 2291 } 2292 return TRUE; 2293 } 2294 2295 /* We need to include the maximum size of PUSHJ-stubs in the initial 2296 section size. This is expected to shrink during linker relaxation. */ 2297 2298 static void 2299 mmix_set_relaxable_size (abfd, sec, ptr) 2300 bfd *abfd ATTRIBUTE_UNUSED; 2301 asection *sec; 2302 void *ptr; 2303 { 2304 struct bfd_link_info *info = ptr; 2305 2306 /* Make sure we only do this for section where we know we want this, 2307 otherwise we might end up resetting the size of COMMONs. */ 2308 if (mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0) 2309 return; 2310 2311 sec->rawsize = sec->size; 2312 sec->size += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2313 * MAX_PUSHJ_STUB_SIZE); 2314 2315 /* For use in relocatable link, we start with a max stubs size. See 2316 mmix_elf_relax_section. */ 2317 if (info->relocatable && sec->output_section) 2318 mmix_elf_section_data (sec->output_section)->pjs.stubs_size_sum 2319 += (mmix_elf_section_data (sec)->pjs.n_pushj_relocs 2320 * MAX_PUSHJ_STUB_SIZE); 2321 } 2322 2323 /* Initialize stuff for the linker-generated GREGs to match 2324 R_MMIX_BASE_PLUS_OFFSET relocs seen by the linker. */ 2325 2326 bfd_boolean 2327 _bfd_mmix_before_linker_allocation (abfd, info) 2328 bfd *abfd ATTRIBUTE_UNUSED; 2329 struct bfd_link_info *info; 2330 { 2331 asection *bpo_gregs_section; 2332 bfd *bpo_greg_owner; 2333 struct bpo_greg_section_info *gregdata; 2334 size_t n_gregs; 2335 bfd_vma gregs_size; 2336 size_t i; 2337 size_t *bpo_reloc_indexes; 2338 bfd *ibfd; 2339 2340 /* Set the initial size of sections. */ 2341 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 2342 bfd_map_over_sections (ibfd, mmix_set_relaxable_size, info); 2343 2344 /* The bpo_greg_owner bfd is supposed to have been set by 2345 mmix_elf_check_relocs when the first R_MMIX_BASE_PLUS_OFFSET is seen. 2346 If there is no such object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2347 bpo_greg_owner = (bfd *) info->base_file; 2348 if (bpo_greg_owner == NULL) 2349 return TRUE; 2350 2351 bpo_gregs_section 2352 = bfd_get_section_by_name (bpo_greg_owner, 2353 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2354 2355 if (bpo_gregs_section == NULL) 2356 return TRUE; 2357 2358 /* We use the target-data handle in the ELF section data. */ 2359 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2360 if (gregdata == NULL) 2361 return FALSE; 2362 2363 n_gregs = gregdata->n_bpo_relocs; 2364 gregdata->n_allocated_bpo_gregs = n_gregs; 2365 2366 /* When this reaches zero during relaxation, all entries have been 2367 filled in and the size of the linker gregs can be calculated. */ 2368 gregdata->n_remaining_bpo_relocs_this_relaxation_round = n_gregs; 2369 2370 /* Set the zeroth-order estimate for the GREGs size. */ 2371 gregs_size = n_gregs * 8; 2372 2373 if (!bfd_set_section_size (bpo_greg_owner, bpo_gregs_section, gregs_size)) 2374 return FALSE; 2375 2376 /* Allocate and set up the GREG arrays. They're filled in at relaxation 2377 time. Note that we must use the max number ever noted for the array, 2378 since the index numbers were created before GC. */ 2379 gregdata->reloc_request 2380 = bfd_zalloc (bpo_greg_owner, 2381 sizeof (struct bpo_reloc_request) 2382 * gregdata->n_max_bpo_relocs); 2383 2384 gregdata->bpo_reloc_indexes 2385 = bpo_reloc_indexes 2386 = bfd_alloc (bpo_greg_owner, 2387 gregdata->n_max_bpo_relocs 2388 * sizeof (size_t)); 2389 if (bpo_reloc_indexes == NULL) 2390 return FALSE; 2391 2392 /* The default order is an identity mapping. */ 2393 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2394 { 2395 bpo_reloc_indexes[i] = i; 2396 gregdata->reloc_request[i].bpo_reloc_no = i; 2397 } 2398 2399 return TRUE; 2400 } 2401 2402 /* Fill in contents in the linker allocated gregs. Everything is 2404 calculated at this point; we just move the contents into place here. */ 2405 2406 bfd_boolean 2407 _bfd_mmix_after_linker_allocation (abfd, link_info) 2408 bfd *abfd ATTRIBUTE_UNUSED; 2409 struct bfd_link_info *link_info; 2410 { 2411 asection *bpo_gregs_section; 2412 bfd *bpo_greg_owner; 2413 struct bpo_greg_section_info *gregdata; 2414 size_t n_gregs; 2415 size_t i, j; 2416 size_t lastreg; 2417 bfd_byte *contents; 2418 2419 /* The bpo_greg_owner bfd is supposed to have been set by mmix_elf_check_relocs 2420 when the first R_MMIX_BASE_PLUS_OFFSET is seen. If there is no such 2421 object, there was no R_MMIX_BASE_PLUS_OFFSET. */ 2422 bpo_greg_owner = (bfd *) link_info->base_file; 2423 if (bpo_greg_owner == NULL) 2424 return TRUE; 2425 2426 bpo_gregs_section 2427 = bfd_get_section_by_name (bpo_greg_owner, 2428 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2429 2430 /* This can't happen without DSO handling. When DSOs are handled 2431 without any R_MMIX_BASE_PLUS_OFFSET seen, there will be no such 2432 section. */ 2433 if (bpo_gregs_section == NULL) 2434 return TRUE; 2435 2436 /* We use the target-data handle in the ELF section data. */ 2437 2438 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2439 if (gregdata == NULL) 2440 return FALSE; 2441 2442 n_gregs = gregdata->n_allocated_bpo_gregs; 2443 2444 bpo_gregs_section->contents 2445 = contents = bfd_alloc (bpo_greg_owner, bpo_gregs_section->size); 2446 if (contents == NULL) 2447 return FALSE; 2448 2449 /* Sanity check: If these numbers mismatch, some relocation has not been 2450 accounted for and the rest of gregdata is probably inconsistent. 2451 It's a bug, but it's more helpful to identify it than segfaulting 2452 below. */ 2453 if (gregdata->n_remaining_bpo_relocs_this_relaxation_round 2454 != gregdata->n_bpo_relocs) 2455 { 2456 (*_bfd_error_handler) 2457 (_("Internal inconsistency: remaining %u != max %u.\n\ 2458 Please report this bug."), 2459 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2460 gregdata->n_bpo_relocs); 2461 return FALSE; 2462 } 2463 2464 for (lastreg = 255, i = 0, j = 0; j < n_gregs; i++) 2465 if (gregdata->reloc_request[i].regindex != lastreg) 2466 { 2467 bfd_put_64 (bpo_greg_owner, gregdata->reloc_request[i].value, 2468 contents + j * 8); 2469 lastreg = gregdata->reloc_request[i].regindex; 2470 j++; 2471 } 2472 2473 return TRUE; 2474 } 2475 2476 /* Sort valid relocs to come before non-valid relocs, then on increasing 2477 value. */ 2478 2479 static int 2480 bpo_reloc_request_sort_fn (p1, p2) 2481 const PTR p1; 2482 const PTR p2; 2483 { 2484 const struct bpo_reloc_request *r1 = (const struct bpo_reloc_request *) p1; 2485 const struct bpo_reloc_request *r2 = (const struct bpo_reloc_request *) p2; 2486 2487 /* Primary function is validity; non-valid relocs sorted after valid 2488 ones. */ 2489 if (r1->valid != r2->valid) 2490 return r2->valid - r1->valid; 2491 2492 /* Then sort on value. Don't simplify and return just the difference of 2493 the values: the upper bits of the 64-bit value would be truncated on 2494 a host with 32-bit ints. */ 2495 if (r1->value != r2->value) 2496 return r1->value > r2->value ? 1 : -1; 2497 2498 /* As a last re-sort, use the relocation number, so we get a stable 2499 sort. The *addresses* aren't stable since items are swapped during 2500 sorting. It depends on the qsort implementation if this actually 2501 happens. */ 2502 return r1->bpo_reloc_no > r2->bpo_reloc_no 2503 ? 1 : (r1->bpo_reloc_no < r2->bpo_reloc_no ? -1 : 0); 2504 } 2505 2506 /* For debug use only. Dumps the global register allocations resulting 2507 from base-plus-offset relocs. */ 2508 2509 void 2510 mmix_dump_bpo_gregs (link_info, pf) 2511 struct bfd_link_info *link_info; 2512 bfd_error_handler_type pf; 2513 { 2514 bfd *bpo_greg_owner; 2515 asection *bpo_gregs_section; 2516 struct bpo_greg_section_info *gregdata; 2517 unsigned int i; 2518 2519 if (link_info == NULL || link_info->base_file == NULL) 2520 return; 2521 2522 bpo_greg_owner = (bfd *) link_info->base_file; 2523 2524 bpo_gregs_section 2525 = bfd_get_section_by_name (bpo_greg_owner, 2526 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 2527 2528 if (bpo_gregs_section == NULL) 2529 return; 2530 2531 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2532 if (gregdata == NULL) 2533 return; 2534 2535 if (pf == NULL) 2536 pf = _bfd_error_handler; 2537 2538 /* These format strings are not translated. They are for debug purposes 2539 only and never displayed to an end user. Should they escape, we 2540 surely want them in original. */ 2541 (*pf) (" n_bpo_relocs: %u\n n_max_bpo_relocs: %u\n n_remain...round: %u\n\ 2542 n_allocated_bpo_gregs: %u\n", gregdata->n_bpo_relocs, 2543 gregdata->n_max_bpo_relocs, 2544 gregdata->n_remaining_bpo_relocs_this_relaxation_round, 2545 gregdata->n_allocated_bpo_gregs); 2546 2547 if (gregdata->reloc_request) 2548 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2549 (*pf) ("%4u (%4u)/%4u#%u: 0x%08lx%08lx r: %3u o: %3u\n", 2550 i, 2551 (gregdata->bpo_reloc_indexes != NULL 2552 ? gregdata->bpo_reloc_indexes[i] : (size_t) -1), 2553 gregdata->reloc_request[i].bpo_reloc_no, 2554 gregdata->reloc_request[i].valid, 2555 2556 (unsigned long) (gregdata->reloc_request[i].value >> 32), 2557 (unsigned long) gregdata->reloc_request[i].value, 2558 gregdata->reloc_request[i].regindex, 2559 gregdata->reloc_request[i].offset); 2560 } 2561 2562 /* This links all R_MMIX_BASE_PLUS_OFFSET relocs into a special array, and 2563 when the last such reloc is done, an index-array is sorted according to 2564 the values and iterated over to produce register numbers (indexed by 0 2565 from the first allocated register number) and offsets for use in real 2566 relocation. 2567 2568 PUSHJ stub accounting is also done here. 2569 2570 Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */ 2571 2572 static bfd_boolean 2573 mmix_elf_relax_section (abfd, sec, link_info, again) 2574 bfd *abfd; 2575 asection *sec; 2576 struct bfd_link_info *link_info; 2577 bfd_boolean *again; 2578 { 2579 Elf_Internal_Shdr *symtab_hdr; 2580 Elf_Internal_Rela *internal_relocs; 2581 Elf_Internal_Rela *irel, *irelend; 2582 asection *bpo_gregs_section = NULL; 2583 struct bpo_greg_section_info *gregdata; 2584 struct bpo_reloc_section_info *bpodata 2585 = mmix_elf_section_data (sec)->bpo.reloc; 2586 /* The initialization is to quiet compiler warnings. The value is to 2587 spot a missing actual initialization. */ 2588 size_t bpono = (size_t) -1; 2589 size_t pjsno = 0; 2590 bfd *bpo_greg_owner; 2591 Elf_Internal_Sym *isymbuf = NULL; 2592 bfd_size_type size = sec->rawsize ? sec->rawsize : sec->size; 2593 2594 mmix_elf_section_data (sec)->pjs.stubs_size_sum = 0; 2595 2596 /* Assume nothing changes. */ 2597 *again = FALSE; 2598 2599 /* We don't have to do anything if this section does not have relocs, or 2600 if this is not a code section. */ 2601 if ((sec->flags & SEC_RELOC) == 0 2602 || sec->reloc_count == 0 2603 || (sec->flags & SEC_CODE) == 0 2604 || (sec->flags & SEC_LINKER_CREATED) != 0 2605 /* If no R_MMIX_BASE_PLUS_OFFSET relocs and no PUSHJ-stub relocs, 2606 then nothing to do. */ 2607 || (bpodata == NULL 2608 && mmix_elf_section_data (sec)->pjs.n_pushj_relocs == 0)) 2609 return TRUE; 2610 2611 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 2612 2613 bpo_greg_owner = (bfd *) link_info->base_file; 2614 2615 if (bpodata != NULL) 2616 { 2617 bpo_gregs_section = bpodata->bpo_greg_section; 2618 gregdata = mmix_elf_section_data (bpo_gregs_section)->bpo.greg; 2619 bpono = bpodata->first_base_plus_offset_reloc; 2620 } 2621 else 2622 gregdata = NULL; 2623 2624 /* Get a copy of the native relocations. */ 2625 internal_relocs 2626 = _bfd_elf_link_read_relocs (abfd, sec, (PTR) NULL, 2627 (Elf_Internal_Rela *) NULL, 2628 link_info->keep_memory); 2629 if (internal_relocs == NULL) 2630 goto error_return; 2631 2632 /* Walk through them looking for relaxing opportunities. */ 2633 irelend = internal_relocs + sec->reloc_count; 2634 for (irel = internal_relocs; irel < irelend; irel++) 2635 { 2636 bfd_vma symval; 2637 struct elf_link_hash_entry *h = NULL; 2638 2639 /* We only process two relocs. */ 2640 if (ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_BASE_PLUS_OFFSET 2641 && ELF64_R_TYPE (irel->r_info) != (int) R_MMIX_PUSHJ_STUBBABLE) 2642 continue; 2643 2644 /* We process relocs in a distinctly different way when this is a 2645 relocatable link (for one, we don't look at symbols), so we avoid 2646 mixing its code with that for the "normal" relaxation. */ 2647 if (link_info->relocatable) 2648 { 2649 /* The only transformation in a relocatable link is to generate 2650 a full stub at the location of the stub calculated for the 2651 input section, if the relocated stub location, the end of the 2652 output section plus earlier stubs, cannot be reached. Thus 2653 relocatable linking can only lead to worse code, but it still 2654 works. */ 2655 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_PUSHJ_STUBBABLE) 2656 { 2657 /* If we can reach the end of the output-section and beyond 2658 any current stubs, then we don't need a stub for this 2659 reloc. The relaxed order of output stub allocation may 2660 not exactly match the straightforward order, so we always 2661 assume presence of output stubs, which will allow 2662 relaxation only on relocations indifferent to the 2663 presence of output stub allocations for other relocations 2664 and thus the order of output stub allocation. */ 2665 if (bfd_check_overflow (complain_overflow_signed, 2666 19, 2667 0, 2668 bfd_arch_bits_per_address (abfd), 2669 /* Output-stub location. */ 2670 sec->output_section->rawsize 2671 + (mmix_elf_section_data (sec 2672 ->output_section) 2673 ->pjs.stubs_size_sum) 2674 /* Location of this PUSHJ reloc. */ 2675 - (sec->output_offset + irel->r_offset) 2676 /* Don't count *this* stub twice. */ 2677 - (mmix_elf_section_data (sec) 2678 ->pjs.stub_size[pjsno] 2679 + MAX_PUSHJ_STUB_SIZE)) 2680 == bfd_reloc_ok) 2681 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2682 2683 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2684 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2685 2686 pjsno++; 2687 } 2688 2689 continue; 2690 } 2691 2692 /* Get the value of the symbol referred to by the reloc. */ 2693 if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info) 2694 { 2695 /* A local symbol. */ 2696 Elf_Internal_Sym *isym; 2697 asection *sym_sec; 2698 2699 /* Read this BFD's local symbols if we haven't already. */ 2700 if (isymbuf == NULL) 2701 { 2702 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; 2703 if (isymbuf == NULL) 2704 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, 2705 symtab_hdr->sh_info, 0, 2706 NULL, NULL, NULL); 2707 if (isymbuf == 0) 2708 goto error_return; 2709 } 2710 2711 isym = isymbuf + ELF64_R_SYM (irel->r_info); 2712 if (isym->st_shndx == SHN_UNDEF) 2713 sym_sec = bfd_und_section_ptr; 2714 else if (isym->st_shndx == SHN_ABS) 2715 sym_sec = bfd_abs_section_ptr; 2716 else if (isym->st_shndx == SHN_COMMON) 2717 sym_sec = bfd_com_section_ptr; 2718 else 2719 sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); 2720 symval = (isym->st_value 2721 + sym_sec->output_section->vma 2722 + sym_sec->output_offset); 2723 } 2724 else 2725 { 2726 unsigned long indx; 2727 2728 /* An external symbol. */ 2729 indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info; 2730 h = elf_sym_hashes (abfd)[indx]; 2731 BFD_ASSERT (h != NULL); 2732 if (h->root.type != bfd_link_hash_defined 2733 && h->root.type != bfd_link_hash_defweak) 2734 { 2735 /* This appears to be a reference to an undefined symbol. Just 2736 ignore it--it will be caught by the regular reloc processing. 2737 We need to keep BPO reloc accounting consistent, though 2738 else we'll abort instead of emitting an error message. */ 2739 if (ELF64_R_TYPE (irel->r_info) == R_MMIX_BASE_PLUS_OFFSET 2740 && gregdata != NULL) 2741 { 2742 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2743 bpono++; 2744 } 2745 continue; 2746 } 2747 2748 symval = (h->root.u.def.value 2749 + h->root.u.def.section->output_section->vma 2750 + h->root.u.def.section->output_offset); 2751 } 2752 2753 if (ELF64_R_TYPE (irel->r_info) == (int) R_MMIX_PUSHJ_STUBBABLE) 2754 { 2755 bfd_vma value = symval + irel->r_addend; 2756 bfd_vma dot 2757 = (sec->output_section->vma 2758 + sec->output_offset 2759 + irel->r_offset); 2760 bfd_vma stubaddr 2761 = (sec->output_section->vma 2762 + sec->output_offset 2763 + size 2764 + mmix_elf_section_data (sec)->pjs.stubs_size_sum); 2765 2766 if ((value & 3) == 0 2767 && bfd_check_overflow (complain_overflow_signed, 2768 19, 2769 0, 2770 bfd_arch_bits_per_address (abfd), 2771 value - dot 2772 - (value > dot 2773 ? mmix_elf_section_data (sec) 2774 ->pjs.stub_size[pjsno] 2775 : 0)) 2776 == bfd_reloc_ok) 2777 /* If the reloc fits, no stub is needed. */ 2778 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 0; 2779 else 2780 /* Maybe we can get away with just a JMP insn? */ 2781 if ((value & 3) == 0 2782 && bfd_check_overflow (complain_overflow_signed, 2783 27, 2784 0, 2785 bfd_arch_bits_per_address (abfd), 2786 value - stubaddr 2787 - (value > dot 2788 ? mmix_elf_section_data (sec) 2789 ->pjs.stub_size[pjsno] - 4 2790 : 0)) 2791 == bfd_reloc_ok) 2792 /* Yep, account for a stub consisting of a single JMP insn. */ 2793 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] = 4; 2794 else 2795 /* Nope, go for the full insn stub. It doesn't seem useful to 2796 emit the intermediate sizes; those will only be useful for 2797 a >64M program assuming contiguous code. */ 2798 mmix_elf_section_data (sec)->pjs.stub_size[pjsno] 2799 = MAX_PUSHJ_STUB_SIZE; 2800 2801 mmix_elf_section_data (sec)->pjs.stubs_size_sum 2802 += mmix_elf_section_data (sec)->pjs.stub_size[pjsno]; 2803 pjsno++; 2804 continue; 2805 } 2806 2807 /* We're looking at a R_MMIX_BASE_PLUS_OFFSET reloc. */ 2808 2809 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono]].value 2810 = symval + irel->r_addend; 2811 gregdata->reloc_request[gregdata->bpo_reloc_indexes[bpono++]].valid = TRUE; 2812 gregdata->n_remaining_bpo_relocs_this_relaxation_round--; 2813 } 2814 2815 /* Check if that was the last BPO-reloc. If so, sort the values and 2816 calculate how many registers we need to cover them. Set the size of 2817 the linker gregs, and if the number of registers changed, indicate 2818 that we need to relax some more because we have more work to do. */ 2819 if (gregdata != NULL 2820 && gregdata->n_remaining_bpo_relocs_this_relaxation_round == 0) 2821 { 2822 size_t i; 2823 bfd_vma prev_base; 2824 size_t regindex; 2825 2826 /* First, reset the remaining relocs for the next round. */ 2827 gregdata->n_remaining_bpo_relocs_this_relaxation_round 2828 = gregdata->n_bpo_relocs; 2829 2830 qsort ((PTR) gregdata->reloc_request, 2831 gregdata->n_max_bpo_relocs, 2832 sizeof (struct bpo_reloc_request), 2833 bpo_reloc_request_sort_fn); 2834 2835 /* Recalculate indexes. When we find a change (however unlikely 2836 after the initial iteration), we know we need to relax again, 2837 since items in the GREG-array are sorted by increasing value and 2838 stored in the relaxation phase. */ 2839 for (i = 0; i < gregdata->n_max_bpo_relocs; i++) 2840 if (gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2841 != i) 2842 { 2843 gregdata->bpo_reloc_indexes[gregdata->reloc_request[i].bpo_reloc_no] 2844 = i; 2845 *again = TRUE; 2846 } 2847 2848 /* Allocate register numbers (indexing from 0). Stop at the first 2849 non-valid reloc. */ 2850 for (i = 0, regindex = 0, prev_base = gregdata->reloc_request[0].value; 2851 i < gregdata->n_bpo_relocs; 2852 i++) 2853 { 2854 if (gregdata->reloc_request[i].value > prev_base + 255) 2855 { 2856 regindex++; 2857 prev_base = gregdata->reloc_request[i].value; 2858 } 2859 gregdata->reloc_request[i].regindex = regindex; 2860 gregdata->reloc_request[i].offset 2861 = gregdata->reloc_request[i].value - prev_base; 2862 } 2863 2864 /* If it's not the same as the last time, we need to relax again, 2865 because the size of the section has changed. I'm not sure we 2866 actually need to do any adjustments since the shrinking happens 2867 at the start of this section, but better safe than sorry. */ 2868 if (gregdata->n_allocated_bpo_gregs != regindex + 1) 2869 { 2870 gregdata->n_allocated_bpo_gregs = regindex + 1; 2871 *again = TRUE; 2872 } 2873 2874 bpo_gregs_section->size = (regindex + 1) * 8; 2875 } 2876 2877 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2878 { 2879 if (! link_info->keep_memory) 2880 free (isymbuf); 2881 else 2882 { 2883 /* Cache the symbols for elf_link_input_bfd. */ 2884 symtab_hdr->contents = (unsigned char *) isymbuf; 2885 } 2886 } 2887 2888 if (internal_relocs != NULL 2889 && elf_section_data (sec)->relocs != internal_relocs) 2890 free (internal_relocs); 2891 2892 if (sec->size < size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2893 abort (); 2894 2895 if (sec->size > size + mmix_elf_section_data (sec)->pjs.stubs_size_sum) 2896 { 2897 sec->size = size + mmix_elf_section_data (sec)->pjs.stubs_size_sum; 2898 *again = TRUE; 2899 } 2900 2901 return TRUE; 2902 2903 error_return: 2904 if (isymbuf != NULL && (unsigned char *) isymbuf != symtab_hdr->contents) 2905 free (isymbuf); 2906 if (internal_relocs != NULL 2907 && elf_section_data (sec)->relocs != internal_relocs) 2908 free (internal_relocs); 2909 return FALSE; 2910 } 2911 2912 #define ELF_ARCH bfd_arch_mmix 2914 #define ELF_MACHINE_CODE EM_MMIX 2915 2916 /* According to mmix-doc page 36 (paragraph 45), this should be (1LL << 48LL). 2917 However, that's too much for something somewhere in the linker part of 2918 BFD; perhaps the start-address has to be a non-zero multiple of this 2919 number, or larger than this number. The symptom is that the linker 2920 complains: "warning: allocated section `.text' not in segment". We 2921 settle for 64k; the page-size used in examples is 8k. 2922 #define ELF_MAXPAGESIZE 0x10000 2923 2924 Unfortunately, this causes excessive padding in the supposedly small 2925 for-education programs that are the expected usage (where people would 2926 inspect output). We stick to 256 bytes just to have *some* default 2927 alignment. */ 2928 #define ELF_MAXPAGESIZE 0x100 2929 2930 #define TARGET_BIG_SYM bfd_elf64_mmix_vec 2931 #define TARGET_BIG_NAME "elf64-mmix" 2932 2933 #define elf_info_to_howto_rel NULL 2934 #define elf_info_to_howto mmix_info_to_howto_rela 2935 #define elf_backend_relocate_section mmix_elf_relocate_section 2936 #define elf_backend_gc_mark_hook mmix_elf_gc_mark_hook 2937 #define elf_backend_gc_sweep_hook mmix_elf_gc_sweep_hook 2938 2939 #define elf_backend_link_output_symbol_hook \ 2940 mmix_elf_link_output_symbol_hook 2941 #define elf_backend_add_symbol_hook mmix_elf_add_symbol_hook 2942 2943 #define elf_backend_check_relocs mmix_elf_check_relocs 2944 #define elf_backend_symbol_processing mmix_elf_symbol_processing 2945 #define elf_backend_omit_section_dynsym \ 2946 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 2947 2948 #define bfd_elf64_bfd_is_local_label_name \ 2949 mmix_elf_is_local_label_name 2950 2951 #define elf_backend_may_use_rel_p 0 2952 #define elf_backend_may_use_rela_p 1 2953 #define elf_backend_default_use_rela_p 1 2954 2955 #define elf_backend_can_gc_sections 1 2956 #define elf_backend_section_from_bfd_section \ 2957 mmix_elf_section_from_bfd_section 2958 2959 #define bfd_elf64_new_section_hook mmix_elf_new_section_hook 2960 #define bfd_elf64_bfd_final_link mmix_elf_final_link 2961 #define bfd_elf64_bfd_relax_section mmix_elf_relax_section 2962 2963 #include "elf64-target.h" 2964
Indexes created Fri May 01 00:23:41 UTC 2026