1 /* VAX series support for 32-bit ELF 2 Copyright (C) 1993-2022 Free Software Foundation, Inc. 3 Contributed by Matt Thomas <matt@3am-software.com>. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #include "sysdep.h" 23 #include "bfd.h" 24 #include "bfdlink.h" 25 #include "libbfd.h" 26 #include "elf-bfd.h" 27 #include "elf/vax.h" 28 29 static reloc_howto_type *reloc_type_lookup (bfd *, bfd_reloc_code_real_type); 30 static bool rtype_to_howto (bfd *, arelent *, Elf_Internal_Rela *); 31 static struct bfd_hash_entry *elf_vax_link_hash_newfunc (struct bfd_hash_entry *, 32 struct bfd_hash_table *, 33 const char *); 34 static struct bfd_link_hash_table *elf_vax_link_hash_table_create (bfd *); 35 static bool elf_vax_check_relocs (bfd *, struct bfd_link_info *, 36 asection *, const Elf_Internal_Rela *); 37 static bool elf_vax_adjust_dynamic_symbol (struct bfd_link_info *, 38 struct elf_link_hash_entry *); 39 static bool elf_vax_size_dynamic_sections (bfd *, struct bfd_link_info *); 40 static int elf_vax_relocate_section (bfd *, struct bfd_link_info *, 41 bfd *, asection *, bfd_byte *, 42 Elf_Internal_Rela *, 43 Elf_Internal_Sym *, asection **); 44 static bool elf_vax_finish_dynamic_symbol (bfd *, struct bfd_link_info *, 45 struct elf_link_hash_entry *, 46 Elf_Internal_Sym *); 47 static bool elf_vax_finish_dynamic_sections (bfd *, struct bfd_link_info *); 48 static bfd_vma elf_vax_plt_sym_val (bfd_vma, const asection *, 49 const arelent *); 50 51 static bool elf32_vax_set_private_flags (bfd *, flagword); 52 static bool elf32_vax_print_private_bfd_data (bfd *, void *); 53 54 static reloc_howto_type howto_table[] = { 55 HOWTO (R_VAX_NONE, /* type */ 56 0, /* rightshift */ 57 0, /* size */ 58 0, /* bitsize */ 59 false, /* pc_relative */ 60 0, /* bitpos */ 61 complain_overflow_dont, /* complain_on_overflow */ 62 bfd_elf_generic_reloc, /* special_function */ 63 "R_VAX_NONE", /* name */ 64 false, /* partial_inplace */ 65 0, /* src_mask */ 66 0x00000000, /* dst_mask */ 67 false), /* pcrel_offset */ 68 69 HOWTO (R_VAX_32, /* type */ 70 0, /* rightshift */ 71 4, /* size */ 72 32, /* bitsize */ 73 false, /* pc_relative */ 74 0, /* bitpos */ 75 complain_overflow_bitfield, /* complain_on_overflow */ 76 bfd_elf_generic_reloc, /* special_function */ 77 "R_VAX_32", /* name */ 78 false, /* partial_inplace */ 79 0, /* src_mask */ 80 0xffffffff, /* dst_mask */ 81 false), /* pcrel_offset */ 82 83 HOWTO (R_VAX_16, /* type */ 84 0, /* rightshift */ 85 2, /* size */ 86 16, /* bitsize */ 87 false, /* pc_relative */ 88 0, /* bitpos */ 89 complain_overflow_bitfield, /* complain_on_overflow */ 90 bfd_elf_generic_reloc, /* special_function */ 91 "R_VAX_16", /* name */ 92 false, /* partial_inplace */ 93 0, /* src_mask */ 94 0x0000ffff, /* dst_mask */ 95 false), /* pcrel_offset */ 96 97 HOWTO (R_VAX_8, /* type */ 98 0, /* rightshift */ 99 1, /* size */ 100 8, /* bitsize */ 101 false, /* pc_relative */ 102 0, /* bitpos */ 103 complain_overflow_bitfield, /* complain_on_overflow */ 104 bfd_elf_generic_reloc, /* special_function */ 105 "R_VAX_8", /* name */ 106 false, /* partial_inplace */ 107 0, /* src_mask */ 108 0x000000ff, /* dst_mask */ 109 false), /* pcrel_offset */ 110 111 HOWTO (R_VAX_PC32, /* type */ 112 0, /* rightshift */ 113 4, /* size */ 114 32, /* bitsize */ 115 true, /* pc_relative */ 116 0, /* bitpos */ 117 complain_overflow_bitfield, /* complain_on_overflow */ 118 bfd_elf_generic_reloc, /* special_function */ 119 "R_VAX_PC32", /* name */ 120 false, /* partial_inplace */ 121 0, /* src_mask */ 122 0xffffffff, /* dst_mask */ 123 true), /* pcrel_offset */ 124 125 HOWTO (R_VAX_PC16, /* type */ 126 0, /* rightshift */ 127 2, /* size */ 128 16, /* bitsize */ 129 true, /* pc_relative */ 130 0, /* bitpos */ 131 complain_overflow_signed, /* complain_on_overflow */ 132 bfd_elf_generic_reloc, /* special_function */ 133 "R_VAX_PC16", /* name */ 134 false, /* partial_inplace */ 135 0, /* src_mask */ 136 0x0000ffff, /* dst_mask */ 137 true), /* pcrel_offset */ 138 139 HOWTO (R_VAX_PC8, /* type */ 140 0, /* rightshift */ 141 1, /* size */ 142 8, /* bitsize */ 143 true, /* pc_relative */ 144 0, /* bitpos */ 145 complain_overflow_signed, /* complain_on_overflow */ 146 bfd_elf_generic_reloc, /* special_function */ 147 "R_VAX_PC8", /* name */ 148 false, /* partial_inplace */ 149 0, /* src_mask */ 150 0x000000ff, /* dst_mask */ 151 true), /* pcrel_offset */ 152 153 HOWTO (R_VAX_GOT32, /* type */ 154 0, /* rightshift */ 155 4, /* size */ 156 32, /* bitsize */ 157 true, /* pc_relative */ 158 0, /* bitpos */ 159 complain_overflow_bitfield, /* complain_on_overflow */ 160 bfd_elf_generic_reloc, /* special_function */ 161 "R_VAX_GOT32", /* name */ 162 false, /* partial_inplace */ 163 0, /* src_mask */ 164 0xffffffff, /* dst_mask */ 165 true), /* pcrel_offset */ 166 167 EMPTY_HOWTO (-1), 168 EMPTY_HOWTO (-1), 169 EMPTY_HOWTO (-1), 170 EMPTY_HOWTO (-1), 171 EMPTY_HOWTO (-1), 172 173 HOWTO (R_VAX_PLT32, /* type */ 174 0, /* rightshift */ 175 4, /* size */ 176 32, /* bitsize */ 177 true, /* pc_relative */ 178 0, /* bitpos */ 179 complain_overflow_bitfield, /* complain_on_overflow */ 180 bfd_elf_generic_reloc, /* special_function */ 181 "R_VAX_PLT32", /* name */ 182 false, /* partial_inplace */ 183 0, /* src_mask */ 184 0xffffffff, /* dst_mask */ 185 true), /* pcrel_offset */ 186 187 EMPTY_HOWTO (-1), 188 EMPTY_HOWTO (-1), 189 EMPTY_HOWTO (-1), 190 EMPTY_HOWTO (-1), 191 EMPTY_HOWTO (-1), 192 193 HOWTO (R_VAX_COPY, /* type */ 194 0, /* rightshift */ 195 0, /* size */ 196 0, /* bitsize */ 197 false, /* pc_relative */ 198 0, /* bitpos */ 199 complain_overflow_dont, /* complain_on_overflow */ 200 bfd_elf_generic_reloc, /* special_function */ 201 "R_VAX_COPY", /* name */ 202 false, /* partial_inplace */ 203 0, /* src_mask */ 204 0xffffffff, /* dst_mask */ 205 false), /* pcrel_offset */ 206 207 HOWTO (R_VAX_GLOB_DAT, /* type */ 208 0, /* rightshift */ 209 4, /* size */ 210 32, /* bitsize */ 211 false, /* pc_relative */ 212 0, /* bitpos */ 213 complain_overflow_dont, /* complain_on_overflow */ 214 bfd_elf_generic_reloc, /* special_function */ 215 "R_VAX_GLOB_DAT", /* name */ 216 false, /* partial_inplace */ 217 0, /* src_mask */ 218 0xffffffff, /* dst_mask */ 219 false), /* pcrel_offset */ 220 221 HOWTO (R_VAX_JMP_SLOT, /* type */ 222 0, /* rightshift */ 223 4, /* size */ 224 32, /* bitsize */ 225 false, /* pc_relative */ 226 0, /* bitpos */ 227 complain_overflow_dont, /* complain_on_overflow */ 228 bfd_elf_generic_reloc, /* special_function */ 229 "R_VAX_JMP_SLOT", /* name */ 230 false, /* partial_inplace */ 231 0, /* src_mask */ 232 0xffffffff, /* dst_mask */ 233 false), /* pcrel_offset */ 234 235 HOWTO (R_VAX_RELATIVE, /* type */ 236 0, /* rightshift */ 237 4, /* size */ 238 32, /* bitsize */ 239 false, /* pc_relative */ 240 0, /* bitpos */ 241 complain_overflow_dont, /* complain_on_overflow */ 242 bfd_elf_generic_reloc, /* special_function */ 243 "R_VAX_RELATIVE", /* name */ 244 false, /* partial_inplace */ 245 0, /* src_mask */ 246 0xffffffff, /* dst_mask */ 247 false), /* pcrel_offset */ 248 249 /* GNU extension to record C++ vtable hierarchy */ 250 HOWTO (R_VAX_GNU_VTINHERIT, /* type */ 251 0, /* rightshift */ 252 4, /* size */ 253 0, /* bitsize */ 254 false, /* pc_relative */ 255 0, /* bitpos */ 256 complain_overflow_dont, /* complain_on_overflow */ 257 NULL, /* special_function */ 258 "R_VAX_GNU_VTINHERIT", /* name */ 259 false, /* partial_inplace */ 260 0, /* src_mask */ 261 0, /* dst_mask */ 262 false), /* pcrel_offset */ 263 264 /* GNU extension to record C++ vtable member usage */ 265 HOWTO (R_VAX_GNU_VTENTRY, /* type */ 266 0, /* rightshift */ 267 4, /* size */ 268 0, /* bitsize */ 269 false, /* pc_relative */ 270 0, /* bitpos */ 271 complain_overflow_dont, /* complain_on_overflow */ 272 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 273 "R_VAX_GNU_VTENTRY", /* name */ 274 false, /* partial_inplace */ 275 0, /* src_mask */ 276 0, /* dst_mask */ 277 false), /* pcrel_offset */ 278 }; 279 280 static bool 281 rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst) 282 { 283 unsigned int r_type; 284 285 r_type = ELF32_R_TYPE (dst->r_info); 286 if (r_type >= R_VAX_max) 287 { 288 /* xgettext:c-format */ 289 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 290 abfd, r_type); 291 bfd_set_error (bfd_error_bad_value); 292 return false; 293 } 294 cache_ptr->howto = &howto_table[r_type]; 295 return true; 296 } 297 298 #define elf_info_to_howto rtype_to_howto 299 300 static const struct 301 { 302 bfd_reloc_code_real_type bfd_val; 303 int elf_val; 304 } reloc_map[] = { 305 { BFD_RELOC_NONE, R_VAX_NONE }, 306 { BFD_RELOC_32, R_VAX_32 }, 307 { BFD_RELOC_16, R_VAX_16 }, 308 { BFD_RELOC_8, R_VAX_8 }, 309 { BFD_RELOC_32_PCREL, R_VAX_PC32 }, 310 { BFD_RELOC_16_PCREL, R_VAX_PC16 }, 311 { BFD_RELOC_8_PCREL, R_VAX_PC8 }, 312 { BFD_RELOC_32_GOT_PCREL, R_VAX_GOT32 }, 313 { BFD_RELOC_32_PLT_PCREL, R_VAX_PLT32 }, 314 { BFD_RELOC_NONE, R_VAX_COPY }, 315 { BFD_RELOC_VAX_GLOB_DAT, R_VAX_GLOB_DAT }, 316 { BFD_RELOC_VAX_JMP_SLOT, R_VAX_JMP_SLOT }, 317 { BFD_RELOC_VAX_RELATIVE, R_VAX_RELATIVE }, 318 { BFD_RELOC_CTOR, R_VAX_32 }, 319 { BFD_RELOC_VTABLE_INHERIT, R_VAX_GNU_VTINHERIT }, 320 { BFD_RELOC_VTABLE_ENTRY, R_VAX_GNU_VTENTRY }, 321 }; 322 323 static reloc_howto_type * 324 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code) 325 { 326 unsigned int i; 327 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) 328 { 329 if (reloc_map[i].bfd_val == code) 330 return &howto_table[reloc_map[i].elf_val]; 331 } 332 return 0; 333 } 334 335 static reloc_howto_type * 336 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 337 const char *r_name) 338 { 339 unsigned int i; 340 341 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) 342 if (howto_table[i].name != NULL 343 && strcasecmp (howto_table[i].name, r_name) == 0) 344 return &howto_table[i]; 345 346 return NULL; 347 } 348 349 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup 350 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup 351 #define ELF_ARCH bfd_arch_vax 352 /* end code generated by elf.el */ 353 354 /* Functions for the VAX ELF linker. */ 355 356 /* The name of the dynamic interpreter. This is put in the .interp 357 section. */ 358 359 #define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so" 360 361 /* The size in bytes of an entry in the procedure linkage table. */ 362 363 #define PLT_ENTRY_SIZE 12 364 365 /* The first entry in a procedure linkage table looks like this. See 366 the SVR4 ABI VAX supplement to see how this works. */ 367 368 static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] = 369 { 370 0xdd, 0xef, /* pushl l^ */ 371 0, 0, 0, 0, /* offset to .plt.got + 4 */ 372 0x17, 0xff, /* jmp @L^(pc) */ 373 0, 0, 0, 0, /* offset to .plt.got + 8 */ 374 }; 375 376 /* Subsequent entries in a procedure linkage table look like this. */ 377 378 static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] = 379 { 380 0xfc, 0x0f, /* .word ^M<r11:r2> */ 381 0x16, 0xef, /* jsb L^(pc) */ 382 0, 0, 0, 0, /* replaced with offset to start of .plt */ 383 0, 0, 0, 0, /* index into .rela.plt */ 384 }; 385 386 /* The VAX linker needs to keep track of the number of relocs that it 387 decides to copy in check_relocs for each symbol. This is so that it 388 can discard PC relative relocs if it doesn't need them when linking 389 with -Bsymbolic. We store the information in a field extending the 390 regular ELF linker hash table. */ 391 392 /* This structure keeps track of the number of PC relative relocs we have 393 copied for a given symbol. */ 394 395 struct elf_vax_pcrel_relocs_copied 396 { 397 /* Next section. */ 398 struct elf_vax_pcrel_relocs_copied *next; 399 /* A section in dynobj. */ 400 asection *section; 401 /* Number of relocs copied in this section. */ 402 bfd_size_type count; 403 }; 404 405 /* VAX ELF linker hash entry. */ 406 407 struct elf_vax_link_hash_entry 408 { 409 struct elf_link_hash_entry root; 410 411 /* Number of PC relative relocs copied for this symbol. */ 412 struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied; 413 414 bfd_vma got_addend; 415 }; 416 417 /* Declare this now that the above structures are defined. */ 418 419 static bool elf_vax_discard_copies (struct elf_vax_link_hash_entry *, 420 void *); 421 422 /* Declare this now that the above structures are defined. */ 423 424 static bool elf_vax_instantiate_got_entries (struct elf_link_hash_entry *, 425 void *); 426 427 /* Traverse an VAX ELF linker hash table. */ 428 429 #define elf_vax_link_hash_traverse(table, func, info) \ 430 (elf_link_hash_traverse \ 431 ((table), \ 432 (bool (*) (struct elf_link_hash_entry *, void *)) (func), \ 433 (info))) 434 435 /* Create an entry in an VAX ELF linker hash table. */ 436 437 static struct bfd_hash_entry * 438 elf_vax_link_hash_newfunc (struct bfd_hash_entry *entry, 439 struct bfd_hash_table *table, 440 const char *string) 441 { 442 struct elf_vax_link_hash_entry *ret = 443 (struct elf_vax_link_hash_entry *) entry; 444 445 /* Allocate the structure if it has not already been allocated by a 446 subclass. */ 447 if (ret == NULL) 448 ret = ((struct elf_vax_link_hash_entry *) 449 bfd_hash_allocate (table, 450 sizeof (struct elf_vax_link_hash_entry))); 451 if (ret == NULL) 452 return (struct bfd_hash_entry *) ret; 453 454 /* Call the allocation method of the superclass. */ 455 ret = ((struct elf_vax_link_hash_entry *) 456 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 457 table, string)); 458 if (ret != NULL) 459 { 460 ret->pcrel_relocs_copied = NULL; 461 } 462 463 return (struct bfd_hash_entry *) ret; 464 } 465 466 /* Create an VAX ELF linker hash table. */ 467 468 static struct bfd_link_hash_table * 469 elf_vax_link_hash_table_create (bfd *abfd) 470 { 471 struct elf_link_hash_table *ret; 472 size_t amt = sizeof (struct elf_link_hash_table); 473 474 ret = bfd_zmalloc (amt); 475 if (ret == NULL) 476 return NULL; 477 478 if (!_bfd_elf_link_hash_table_init (ret, abfd, 479 elf_vax_link_hash_newfunc, 480 sizeof (struct elf_vax_link_hash_entry), 481 GENERIC_ELF_DATA)) 482 { 483 free (ret); 484 return NULL; 485 } 486 487 return &ret->root; 488 } 489 490 /* Keep vax-specific flags in the ELF header */ 491 static bool 492 elf32_vax_set_private_flags (bfd *abfd, flagword flags) 493 { 494 elf_elfheader (abfd)->e_flags = flags; 495 elf_flags_init (abfd) = true; 496 return true; 497 } 498 499 /* Merge backend specific data from an object file to the output 500 object file when linking. */ 501 static bool 502 elf32_vax_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 503 { 504 bfd *obfd = info->output_bfd; 505 flagword in_flags; 506 507 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 508 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 509 return true; 510 511 in_flags = elf_elfheader (ibfd)->e_flags; 512 513 if (!elf_flags_init (obfd)) 514 { 515 elf_flags_init (obfd) = true; 516 elf_elfheader (obfd)->e_flags = in_flags; 517 } 518 519 return true; 520 } 521 522 /* Display the flags field */ 523 static bool 524 elf32_vax_print_private_bfd_data (bfd *abfd, void * ptr) 525 { 526 FILE *file = (FILE *) ptr; 527 528 BFD_ASSERT (abfd != NULL && ptr != NULL); 529 530 /* Print normal ELF private data. */ 531 _bfd_elf_print_private_bfd_data (abfd, ptr); 532 533 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ 534 535 /* xgettext:c-format */ 536 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 537 538 if (elf_elfheader (abfd)->e_flags & EF_VAX_NONPIC) 539 fprintf (file, _(" [nonpic]")); 540 541 if (elf_elfheader (abfd)->e_flags & EF_VAX_DFLOAT) 542 fprintf (file, _(" [d-float]")); 543 544 if (elf_elfheader (abfd)->e_flags & EF_VAX_GFLOAT) 545 fprintf (file, _(" [g-float]")); 546 547 fputc ('\n', file); 548 549 return true; 550 } 551 /* Look through the relocs for a section during the first phase, and 552 allocate space in the global offset table or procedure linkage 553 table. */ 554 555 static bool 556 elf_vax_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, 557 const Elf_Internal_Rela *relocs) 558 { 559 bfd *dynobj; 560 Elf_Internal_Shdr *symtab_hdr; 561 struct elf_link_hash_entry **sym_hashes; 562 const Elf_Internal_Rela *rel; 563 const Elf_Internal_Rela *rel_end; 564 asection *sreloc; 565 566 if (bfd_link_relocatable (info)) 567 return true; 568 569 dynobj = elf_hash_table (info)->dynobj; 570 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 571 sym_hashes = elf_sym_hashes (abfd); 572 573 sreloc = NULL; 574 575 rel_end = relocs + sec->reloc_count; 576 for (rel = relocs; rel < rel_end; rel++) 577 { 578 unsigned long r_symndx; 579 struct elf_link_hash_entry *h; 580 581 r_symndx = ELF32_R_SYM (rel->r_info); 582 583 if (r_symndx < symtab_hdr->sh_info) 584 h = NULL; 585 else 586 { 587 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 588 while (h->root.type == bfd_link_hash_indirect 589 || h->root.type == bfd_link_hash_warning) 590 h = (struct elf_link_hash_entry *) h->root.u.i.link; 591 } 592 593 switch (ELF32_R_TYPE (rel->r_info)) 594 { 595 case R_VAX_GOT32: 596 BFD_ASSERT (h != NULL); 597 598 /* If this is a local symbol, we resolve it directly without 599 creating a global offset table entry. */ 600 if (SYMBOL_REFERENCES_LOCAL (info, h) 601 || h == elf_hash_table (info)->hgot 602 || h == elf_hash_table (info)->hplt) 603 break; 604 605 /* This symbol requires a global offset table entry. */ 606 607 if (dynobj == NULL) 608 { 609 /* Create the .got section. */ 610 elf_hash_table (info)->dynobj = dynobj = abfd; 611 if (!_bfd_elf_create_got_section (dynobj, info)) 612 return false; 613 } 614 615 if (h != NULL) 616 { 617 struct elf_vax_link_hash_entry *eh; 618 619 eh = (struct elf_vax_link_hash_entry *) h; 620 if (h->got.refcount == -1) 621 { 622 h->got.refcount = 1; 623 eh->got_addend = rel->r_addend; 624 } 625 else 626 { 627 h->got.refcount++; 628 if (eh->got_addend != (bfd_vma) rel->r_addend) 629 _bfd_error_handler 630 /* xgettext:c-format */ 631 (_("%pB: warning: GOT addend of %" PRId64 " to `%s' does" 632 " not match previous GOT addend of %" PRId64), 633 abfd, (int64_t) rel->r_addend, h->root.root.string, 634 (int64_t) eh->got_addend); 635 636 } 637 } 638 break; 639 640 case R_VAX_PLT32: 641 /* This symbol requires a procedure linkage table entry. We 642 actually build the entry in adjust_dynamic_symbol, 643 because this might be a case of linking PIC code which is 644 never referenced by a dynamic object, in which case we 645 don't need to generate a procedure linkage table entry 646 after all. */ 647 BFD_ASSERT (h != NULL); 648 649 /* If this is a local symbol, we resolve it directly without 650 creating a procedure linkage table entry. */ 651 if (h->forced_local) 652 break; 653 654 h->needs_plt = 1; 655 if (h->plt.refcount == -1) 656 h->plt.refcount = 1; 657 else 658 h->plt.refcount++; 659 break; 660 661 case R_VAX_PC8: 662 case R_VAX_PC16: 663 case R_VAX_PC32: 664 /* If we are creating a shared library and this is not a local 665 symbol, we need to copy the reloc into the shared library. 666 However when linking with -Bsymbolic and this is a global 667 symbol which is defined in an object we are including in the 668 link (i.e., DEF_REGULAR is set), then we can resolve the 669 reloc directly. At this point we have not seen all the input 670 files, so it is possible that DEF_REGULAR is not set now but 671 will be set later (it is never cleared). We account for that 672 possibility below by storing information in the 673 pcrel_relocs_copied field of the hash table entry. */ 674 if (!(bfd_link_pic (info) 675 && (sec->flags & SEC_ALLOC) != 0 676 && h != NULL 677 && (!info->symbolic 678 || !h->def_regular))) 679 { 680 if (h != NULL 681 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 682 && !h->forced_local) 683 { 684 /* Make sure a plt entry is created for this symbol if 685 it turns out to be a function defined by a dynamic 686 object. */ 687 if (h->plt.refcount == -1) 688 h->plt.refcount = 1; 689 else 690 h->plt.refcount++; 691 } 692 break; 693 } 694 /* If this is a local symbol, we can resolve it directly. */ 695 if (h != NULL 696 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 697 || h->forced_local)) 698 break; 699 700 /* Fall through. */ 701 case R_VAX_8: 702 case R_VAX_16: 703 case R_VAX_32: 704 if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) 705 { 706 /* Make sure a plt entry is created for this symbol if it 707 turns out to be a function defined by a dynamic object. */ 708 if (h->plt.refcount == -1) 709 h->plt.refcount = 1; 710 else 711 h->plt.refcount++; 712 } 713 714 /* Non-GOT reference may need a copy reloc in executable or 715 a dynamic reloc in shared library. */ 716 if (h != NULL) 717 h->non_got_ref = 1; 718 719 /* If we are creating a shared library, we need to copy the 720 reloc into the shared library. */ 721 if (bfd_link_pic (info) 722 && (sec->flags & SEC_ALLOC) != 0) 723 { 724 /* When creating a shared object, we must copy these 725 reloc types into the output file. We create a reloc 726 section in dynobj and make room for this reloc. */ 727 if (sreloc == NULL) 728 { 729 sreloc = _bfd_elf_make_dynamic_reloc_section 730 (sec, dynobj, 2, abfd, /*rela?*/ true); 731 732 if (sreloc == NULL) 733 return false; 734 735 if (sec->flags & SEC_READONLY) 736 info->flags |= DF_TEXTREL; 737 } 738 739 sreloc->size += sizeof (Elf32_External_Rela); 740 741 /* If we are linking with -Bsymbolic, we count the number of 742 PC relative relocations we have entered for this symbol, 743 so that we can discard them again if the symbol is later 744 defined by a regular object. Note that this function is 745 only called if we are using a vaxelf linker hash table, 746 which means that h is really a pointer to an 747 elf_vax_link_hash_entry. */ 748 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8 749 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16 750 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32) 751 && info->symbolic) 752 { 753 struct elf_vax_link_hash_entry *eh; 754 struct elf_vax_pcrel_relocs_copied *p; 755 756 eh = (struct elf_vax_link_hash_entry *) h; 757 758 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) 759 if (p->section == sreloc) 760 break; 761 762 if (p == NULL) 763 { 764 p = ((struct elf_vax_pcrel_relocs_copied *) 765 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 766 if (p == NULL) 767 return false; 768 p->next = eh->pcrel_relocs_copied; 769 eh->pcrel_relocs_copied = p; 770 p->section = sreloc; 771 p->count = 0; 772 } 773 774 ++p->count; 775 } 776 } 777 778 break; 779 780 /* This relocation describes the C++ object vtable hierarchy. 781 Reconstruct it for later use during GC. */ 782 case R_VAX_GNU_VTINHERIT: 783 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 784 return false; 785 break; 786 787 /* This relocation describes which C++ vtable entries are actually 788 used. Record for later use during GC. */ 789 case R_VAX_GNU_VTENTRY: 790 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 791 return false; 792 break; 793 794 default: 795 break; 796 } 797 } 798 799 return true; 800 } 801 802 /* Return the section that should be marked against GC for a given 803 relocation. */ 804 805 static asection * 806 elf_vax_gc_mark_hook (asection *sec, 807 struct bfd_link_info *info, 808 Elf_Internal_Rela *rel, 809 struct elf_link_hash_entry *h, 810 Elf_Internal_Sym *sym) 811 { 812 if (h != NULL) 813 switch (ELF32_R_TYPE (rel->r_info)) 814 { 815 case R_VAX_GNU_VTINHERIT: 816 case R_VAX_GNU_VTENTRY: 817 return NULL; 818 } 819 820 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 821 } 822 823 /* Adjust a symbol defined by a dynamic object and referenced by a 824 regular object. The current definition is in some section of the 825 dynamic object, but we're not including those sections. We have to 826 change the definition to something the rest of the link can 827 understand. */ 828 829 static bool 830 elf_vax_adjust_dynamic_symbol (struct bfd_link_info *info, 831 struct elf_link_hash_entry *h) 832 { 833 bfd *dynobj; 834 asection *s; 835 836 dynobj = elf_hash_table (info)->dynobj; 837 838 /* Make sure we know what is going on here. */ 839 BFD_ASSERT (dynobj != NULL 840 && (h->needs_plt 841 || h->is_weakalias 842 || (h->def_dynamic 843 && h->ref_regular 844 && !h->def_regular))); 845 846 /* If this is a function, put it in the procedure linkage table. We 847 will fill in the contents of the procedure linkage table later, 848 when we know the address of the .got section. */ 849 if (h->type == STT_FUNC 850 || h->needs_plt) 851 { 852 if (h->plt.refcount <= 0 853 || SYMBOL_CALLS_LOCAL (info, h) 854 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 855 && h->root.type == bfd_link_hash_undefweak)) 856 { 857 /* This case can occur if we saw a PLTxx reloc in an input 858 file, but the symbol was never referred to by a dynamic 859 object, or if all references were garbage collected. In 860 such a case, we don't actually need to build a procedure 861 linkage table, and we can just do a PCxx reloc instead. */ 862 h->plt.offset = (bfd_vma) -1; 863 h->needs_plt = 0; 864 return true; 865 } 866 867 s = elf_hash_table (info)->splt; 868 BFD_ASSERT (s != NULL); 869 870 /* If this is the first .plt entry, make room for the special 871 first entry. */ 872 if (s->size == 0) 873 { 874 s->size += PLT_ENTRY_SIZE; 875 } 876 877 /* If this symbol is not defined in a regular file, and we are 878 not generating a shared library, then set the symbol to this 879 location in the .plt. This is required to make function 880 pointers compare as equal between the normal executable and 881 the shared library. */ 882 if (!bfd_link_pic (info) 883 && !h->def_regular) 884 { 885 h->root.u.def.section = s; 886 h->root.u.def.value = s->size; 887 } 888 889 h->plt.offset = s->size; 890 891 /* Make room for this entry. */ 892 s->size += PLT_ENTRY_SIZE; 893 894 /* We also need to make an entry in the .got.plt section, which 895 will be placed in the .got section by the linker script. */ 896 897 s = elf_hash_table (info)->sgotplt; 898 BFD_ASSERT (s != NULL); 899 s->size += 4; 900 901 /* We also need to make an entry in the .rela.plt section. */ 902 903 s = elf_hash_table (info)->srelplt; 904 BFD_ASSERT (s != NULL); 905 s->size += sizeof (Elf32_External_Rela); 906 907 return true; 908 } 909 910 /* Reinitialize the plt offset now that it is not used as a reference 911 count any more. */ 912 h->plt.offset = (bfd_vma) -1; 913 914 /* If this is a weak symbol, and there is a real definition, the 915 processor independent code will have arranged for us to see the 916 real definition first, and we can just use the same value. */ 917 if (h->is_weakalias) 918 { 919 struct elf_link_hash_entry *def = weakdef (h); 920 BFD_ASSERT (def->root.type == bfd_link_hash_defined); 921 h->root.u.def.section = def->root.u.def.section; 922 h->root.u.def.value = def->root.u.def.value; 923 return true; 924 } 925 926 /* This is a reference to a symbol defined by a dynamic object which 927 is not a function. */ 928 929 /* If we are creating a shared library, we must presume that the 930 only references to the symbol are via the global offset table. 931 For such cases we need not do anything here; the relocations will 932 be handled correctly by relocate_section. */ 933 if (bfd_link_pic (info)) 934 return true; 935 936 /* If there are no references to this symbol that do not use the 937 GOT relocation, we don't need to generate a copy reloc. */ 938 if (!h->non_got_ref) 939 return true; 940 941 /* We must allocate the symbol in our .dynbss section, which will 942 become part of the .bss section of the executable. There will be 943 an entry for this symbol in the .dynsym section. The dynamic 944 object will contain position independent code, so all references 945 from the dynamic object to this symbol will go through the global 946 offset table. The dynamic linker will use the .dynsym entry to 947 determine the address it must put in the global offset table, so 948 both the dynamic object and the regular object will refer to the 949 same memory location for the variable. */ 950 951 s = bfd_get_linker_section (dynobj, ".dynbss"); 952 BFD_ASSERT (s != NULL); 953 954 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to 955 copy the initial value out of the dynamic object and into the 956 runtime process image. We need to remember the offset into the 957 .rela.bss section we are going to use. */ 958 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 959 { 960 asection *srel; 961 962 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 963 BFD_ASSERT (srel != NULL); 964 srel->size += sizeof (Elf32_External_Rela); 965 h->needs_copy = 1; 966 } 967 968 return _bfd_elf_adjust_dynamic_copy (info, h, s); 969 } 970 971 /* This function is called via elf_link_hash_traverse. It resets GOT 972 and PLT (.GOT) reference counts back to -1 so normal PC32 relocation 973 will be done. */ 974 975 static bool 976 elf_vax_discard_got_entries (struct elf_link_hash_entry *h, 977 void *infoptr ATTRIBUTE_UNUSED) 978 { 979 h->got.refcount = -1; 980 h->plt.refcount = -1; 981 982 return true; 983 } 984 985 /* Discard unused dynamic data if this is a static link. */ 986 987 static bool 988 elf_vax_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 989 struct bfd_link_info *info) 990 { 991 bfd *dynobj; 992 asection *s; 993 994 dynobj = elf_hash_table (info)->dynobj; 995 996 if (dynobj && !elf_hash_table (info)->dynamic_sections_created) 997 { 998 /* We may have created entries in the .rela.got and .got sections. 999 However, if we are not creating the dynamic sections, we will 1000 not actually use these entries. Reset the size of .rela.got 1001 and .got, which will cause them to get stripped from the output 1002 file below. */ 1003 s = elf_hash_table (info)->srelgot; 1004 if (s != NULL) 1005 s->size = 0; 1006 s = elf_hash_table (info)->sgotplt; 1007 if (s != NULL) 1008 s->size = 0; 1009 s = elf_hash_table (info)->sgot; 1010 if (s != NULL) 1011 s->size = 0; 1012 } 1013 1014 /* If this is a static link, we need to discard all the got entries we've 1015 recorded. */ 1016 if (!dynobj || !elf_hash_table (info)->dynamic_sections_created) 1017 elf_link_hash_traverse (elf_hash_table (info), 1018 elf_vax_discard_got_entries, 1019 info); 1020 1021 return true; 1022 } 1023 1024 /* Set the sizes of the dynamic sections. */ 1025 1026 static bool 1027 elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 1028 { 1029 bfd *dynobj; 1030 asection *s; 1031 bool relocs; 1032 1033 dynobj = elf_hash_table (info)->dynobj; 1034 BFD_ASSERT (dynobj != NULL); 1035 1036 if (elf_hash_table (info)->dynamic_sections_created) 1037 { 1038 /* Set the contents of the .interp section to the interpreter. */ 1039 if (bfd_link_executable (info) && !info->nointerp) 1040 { 1041 s = bfd_get_linker_section (dynobj, ".interp"); 1042 BFD_ASSERT (s != NULL); 1043 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1044 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1045 } 1046 } 1047 1048 /* If this is a -Bsymbolic shared link, then we need to discard all PC 1049 relative relocs against symbols defined in a regular object. We 1050 allocated space for them in the check_relocs routine, but we will not 1051 fill them in in the relocate_section routine. */ 1052 if (bfd_link_pic (info) && info->symbolic) 1053 elf_vax_link_hash_traverse (elf_hash_table (info), 1054 elf_vax_discard_copies, 1055 NULL); 1056 1057 /* If this is a -Bsymbolic shared link, we need to discard all the got 1058 entries we've recorded. Otherwise, we need to instantiate (allocate 1059 space for them). */ 1060 elf_link_hash_traverse (elf_hash_table (info), 1061 elf_vax_instantiate_got_entries, 1062 info); 1063 1064 /* The check_relocs and adjust_dynamic_symbol entry points have 1065 determined the sizes of the various dynamic sections. Allocate 1066 memory for them. */ 1067 relocs = false; 1068 for (s = dynobj->sections; s != NULL; s = s->next) 1069 { 1070 const char *name; 1071 1072 if ((s->flags & SEC_LINKER_CREATED) == 0) 1073 continue; 1074 1075 /* It's OK to base decisions on the section name, because none 1076 of the dynobj section names depend upon the input files. */ 1077 name = bfd_section_name (s); 1078 1079 if (strcmp (name, ".plt") == 0) 1080 { 1081 /* Remember whether there is a PLT. */ 1082 ; 1083 } 1084 else if (startswith (name, ".rela")) 1085 { 1086 if (s->size != 0) 1087 { 1088 if (strcmp (name, ".rela.plt") != 0) 1089 relocs = true; 1090 1091 /* We use the reloc_count field as a counter if we need 1092 to copy relocs into the output file. */ 1093 s->reloc_count = 0; 1094 } 1095 } 1096 else if (! startswith (name, ".got") 1097 && strcmp (name, ".dynbss") != 0) 1098 { 1099 /* It's not one of our sections, so don't allocate space. */ 1100 continue; 1101 } 1102 1103 if (s->size == 0) 1104 { 1105 /* If we don't need this section, strip it from the 1106 output file. This is mostly to handle .rela.bss and 1107 .rela.plt. We must create both sections in 1108 create_dynamic_sections, because they must be created 1109 before the linker maps input sections to output 1110 sections. The linker does that before 1111 adjust_dynamic_symbol is called, and it is that 1112 function which decides whether anything needs to go 1113 into these sections. */ 1114 s->flags |= SEC_EXCLUDE; 1115 continue; 1116 } 1117 1118 if ((s->flags & SEC_HAS_CONTENTS) == 0) 1119 continue; 1120 1121 /* Allocate memory for the section contents. */ 1122 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 1123 if (s->contents == NULL) 1124 return false; 1125 } 1126 1127 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs); 1128 } 1129 1130 /* This function is called via elf_vax_link_hash_traverse if we are 1131 creating a shared object with -Bsymbolic. It discards the space 1132 allocated to copy PC relative relocs against symbols which are defined 1133 in regular objects. We allocated space for them in the check_relocs 1134 routine, but we won't fill them in in the relocate_section routine. */ 1135 1136 static bool 1137 elf_vax_discard_copies (struct elf_vax_link_hash_entry *h, 1138 void * ignore ATTRIBUTE_UNUSED) 1139 { 1140 struct elf_vax_pcrel_relocs_copied *s; 1141 1142 /* We only discard relocs for symbols defined in a regular object. */ 1143 if (!h->root.def_regular) 1144 return true; 1145 1146 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) 1147 s->section->size -= s->count * sizeof (Elf32_External_Rela); 1148 1149 return true; 1150 } 1151 1152 /* This function is called via elf_link_hash_traverse. It looks for 1153 entries that have GOT or PLT (.GOT) references. If creating a shared 1154 object with -Bsymbolic, or the symbol has been forced local, then it 1155 resets the reference count back to -1 so normal PC32 relocation will 1156 be done. Otherwise space in the .got and .rela.got will be reserved 1157 for the symbol. */ 1158 1159 static bool 1160 elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, void * infoptr) 1161 { 1162 struct bfd_link_info *info = (struct bfd_link_info *) infoptr; 1163 bfd *dynobj; 1164 asection *sgot; 1165 asection *srelgot; 1166 1167 /* We don't care about non-GOT (and non-PLT) entries. */ 1168 if (h->got.refcount <= 0 && h->plt.refcount <= 0) 1169 return true; 1170 1171 dynobj = elf_hash_table (info)->dynobj; 1172 BFD_ASSERT (dynobj != NULL); 1173 1174 sgot = elf_hash_table (info)->sgot; 1175 srelgot = elf_hash_table (info)->srelgot; 1176 1177 if (SYMBOL_REFERENCES_LOCAL (info, h)) 1178 { 1179 h->got.refcount = -1; 1180 h->plt.refcount = -1; 1181 } 1182 else if (h->got.refcount > 0) 1183 { 1184 /* Make sure this symbol is output as a dynamic symbol. */ 1185 if (h->dynindx == -1) 1186 { 1187 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 1188 return false; 1189 } 1190 1191 /* Allocate space in the .got and .rela.got sections. */ 1192 sgot->size += 4; 1193 srelgot->size += sizeof (Elf32_External_Rela); 1194 } 1195 1196 return true; 1197 } 1198 1199 /* Relocate an VAX ELF section. */ 1200 1201 static int 1202 elf_vax_relocate_section (bfd *output_bfd, 1203 struct bfd_link_info *info, 1204 bfd *input_bfd, 1205 asection *input_section, 1206 bfd_byte *contents, 1207 Elf_Internal_Rela *relocs, 1208 Elf_Internal_Sym *local_syms, 1209 asection **local_sections) 1210 { 1211 Elf_Internal_Shdr *symtab_hdr; 1212 struct elf_link_hash_entry **sym_hashes; 1213 bfd_vma plt_index; 1214 bfd_vma got_offset; 1215 asection *sgot; 1216 asection *splt; 1217 asection *sgotplt; 1218 asection *sreloc; 1219 Elf_Internal_Rela *rel; 1220 Elf_Internal_Rela *relend; 1221 1222 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1223 sym_hashes = elf_sym_hashes (input_bfd); 1224 1225 sgot = NULL; 1226 splt = NULL; 1227 sgotplt = NULL; 1228 sreloc = NULL; 1229 1230 rel = relocs; 1231 relend = relocs + input_section->reloc_count; 1232 for (; rel < relend; rel++) 1233 { 1234 int r_type; 1235 reloc_howto_type *howto; 1236 unsigned long r_symndx; 1237 struct elf_link_hash_entry *h; 1238 Elf_Internal_Sym *sym; 1239 asection *sec; 1240 bfd_vma relocation; 1241 bfd_reloc_status_type r; 1242 1243 r_type = ELF32_R_TYPE (rel->r_info); 1244 if (r_type < 0 || r_type >= (int) R_VAX_max) 1245 { 1246 bfd_set_error (bfd_error_bad_value); 1247 return false; 1248 } 1249 howto = howto_table + r_type; 1250 1251 r_symndx = ELF32_R_SYM (rel->r_info); 1252 h = NULL; 1253 sym = NULL; 1254 sec = NULL; 1255 if (r_symndx < symtab_hdr->sh_info) 1256 { 1257 sym = local_syms + r_symndx; 1258 sec = local_sections[r_symndx]; 1259 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1260 } 1261 else 1262 { 1263 bool unresolved_reloc; 1264 bool warned, ignored; 1265 1266 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1267 r_symndx, symtab_hdr, sym_hashes, 1268 h, sec, relocation, 1269 unresolved_reloc, warned, ignored); 1270 1271 if ((h->root.type == bfd_link_hash_defined 1272 || h->root.type == bfd_link_hash_defweak) 1273 && ((r_type == R_VAX_PLT32 1274 && h->plt.offset != (bfd_vma) -1 1275 && !h->forced_local 1276 && elf_hash_table (info)->dynamic_sections_created) 1277 || (r_type == R_VAX_GOT32 1278 && h->got.offset != (bfd_vma) -1 1279 && !h->forced_local 1280 && elf_hash_table (info)->dynamic_sections_created 1281 && (! bfd_link_pic (info) 1282 || (! info->symbolic && h->dynindx != -1) 1283 || !h->def_regular)) 1284 || (bfd_link_pic (info) 1285 && ((! info->symbolic && h->dynindx != -1) 1286 || !h->def_regular) 1287 && ((input_section->flags & SEC_ALLOC) != 0 1288 /* DWARF will emit R_VAX_32 relocations in its 1289 sections against symbols defined externally 1290 in shared libraries. We can't do anything 1291 with them here. */ 1292 1293 || ((input_section->flags & SEC_DEBUGGING) != 0 1294 && h->def_dynamic)) 1295 && (r_type == R_VAX_8 1296 || r_type == R_VAX_16 1297 || r_type == R_VAX_32)))) 1298 /* In these cases, we don't need the relocation 1299 value. We check specially because in some 1300 obscure cases sec->output_section will be NULL. */ 1301 relocation = 0; 1302 } 1303 1304 if (sec != NULL && discarded_section (sec)) 1305 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1306 rel, 1, relend, howto, 0, contents); 1307 1308 if (bfd_link_relocatable (info)) 1309 continue; 1310 1311 switch (r_type) 1312 { 1313 case R_VAX_GOT32: 1314 /* Relocation is to the address of the entry for this symbol 1315 in the global offset table. */ 1316 1317 /* Resolve a GOTxx reloc against a local symbol directly, 1318 without using the global offset table. */ 1319 if (h == NULL 1320 || h->got.offset == (bfd_vma) -1) 1321 break; 1322 1323 { 1324 bfd_vma off; 1325 1326 sgot = elf_hash_table (info)->sgot; 1327 BFD_ASSERT (sgot != NULL); 1328 1329 off = h->got.offset; 1330 BFD_ASSERT (off < sgot->size); 1331 1332 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off); 1333 1334 relocation = sgot->output_offset + off; 1335 /* The GOT relocation uses the addend. */ 1336 rel->r_addend = 0; 1337 1338 /* Change the reference to be indirect. */ 1339 contents[rel->r_offset - 1] |= 0x10; 1340 relocation += sgot->output_section->vma; 1341 } 1342 break; 1343 1344 case R_VAX_PC32: 1345 /* If we are creating an executable and the function this 1346 reloc refers to is in a shared lib, then we made a PLT 1347 entry for this symbol and need to handle the reloc like 1348 a PLT reloc. */ 1349 if (bfd_link_pic (info)) 1350 goto r_vax_pc32_shared; 1351 /* Fall through. */ 1352 case R_VAX_PLT32: 1353 /* Relocation is to the entry for this symbol in the 1354 procedure linkage table. */ 1355 1356 /* Resolve a PLTxx reloc against a local symbol directly, 1357 without using the procedure linkage table. */ 1358 if (h == NULL 1359 || h->plt.offset == (bfd_vma) -1) 1360 break; 1361 1362 splt = elf_hash_table (info)->splt; 1363 BFD_ASSERT (splt != NULL); 1364 1365 sgotplt = elf_hash_table (info)->sgotplt; 1366 BFD_ASSERT (sgotplt != NULL); 1367 1368 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1369 1370 /* Get the offset into the .got table of the entry that 1371 corresponds to this function. Each .got entry is 4 bytes. 1372 The first two are reserved. */ 1373 got_offset = (plt_index + 3) * 4; 1374 1375 /* We want the relocation to point into the .got.plt instead 1376 of the plt itself. */ 1377 relocation = (sgotplt->output_section->vma 1378 + sgotplt->output_offset 1379 + got_offset); 1380 contents[rel->r_offset-1] |= 0x10; /* make indirect */ 1381 if (rel->r_addend == 2) 1382 { 1383 h->plt.offset |= 1; 1384 } 1385 else if (rel->r_addend != 0) 1386 _bfd_error_handler 1387 /* xgettext:c-format */ 1388 (_("%pB: warning: PLT addend of %" PRId64 " to `%s'" 1389 " from %pA section ignored"), 1390 input_bfd, (int64_t) rel->r_addend, h->root.root.string, 1391 input_section); 1392 rel->r_addend = 0; 1393 1394 break; 1395 1396 case R_VAX_PC8: 1397 case R_VAX_PC16: 1398 r_vax_pc32_shared: 1399 if (h == NULL 1400 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1401 || h->forced_local) 1402 break; 1403 /* Fall through. */ 1404 case R_VAX_8: 1405 case R_VAX_16: 1406 case R_VAX_32: 1407 if (bfd_link_pic (info) 1408 && r_symndx != STN_UNDEF 1409 && (input_section->flags & SEC_ALLOC) != 0 1410 && ((r_type != R_VAX_PC8 1411 && r_type != R_VAX_PC16 1412 && r_type != R_VAX_PC32) 1413 || ((input_section->flags & SEC_CODE) 1414 && (!info->symbolic 1415 || (!h->def_regular && h->type != STT_SECTION))))) 1416 { 1417 Elf_Internal_Rela outrel; 1418 bfd_byte *loc; 1419 bool skip, relocate; 1420 1421 /* When generating a shared object, these relocations 1422 are copied into the output file to be resolved at run 1423 time. */ 1424 if (sreloc == NULL) 1425 { 1426 sreloc = _bfd_elf_get_dynamic_reloc_section 1427 (input_bfd, input_section, /*rela?*/ true); 1428 if (sreloc == NULL) 1429 return false; 1430 } 1431 1432 skip = false; 1433 relocate = false; 1434 1435 outrel.r_offset = 1436 _bfd_elf_section_offset (output_bfd, info, input_section, 1437 rel->r_offset); 1438 if (outrel.r_offset == (bfd_vma) -1) 1439 skip = true; 1440 if (outrel.r_offset == (bfd_vma) -2) 1441 skip = true, relocate = true; 1442 outrel.r_offset += (input_section->output_section->vma 1443 + input_section->output_offset); 1444 1445 if (skip) 1446 memset (&outrel, 0, sizeof outrel); 1447 /* h->dynindx may be -1 if the symbol was marked to 1448 become local. */ 1449 else if (h != NULL 1450 && ((! info->symbolic && h->dynindx != -1) 1451 || !h->def_regular)) 1452 { 1453 BFD_ASSERT (h->dynindx != -1); 1454 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1455 outrel.r_addend = relocation + rel->r_addend; 1456 } 1457 else 1458 { 1459 if (r_type == R_VAX_32) 1460 { 1461 relocate = true; 1462 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE); 1463 BFD_ASSERT (bfd_get_signed_32 (input_bfd, 1464 &contents[rel->r_offset]) == 0); 1465 outrel.r_addend = relocation + rel->r_addend; 1466 } 1467 else 1468 { 1469 long indx; 1470 1471 if (bfd_is_abs_section (sec)) 1472 indx = 0; 1473 else if (sec == NULL || sec->owner == NULL) 1474 { 1475 bfd_set_error (bfd_error_bad_value); 1476 return false; 1477 } 1478 else 1479 { 1480 asection *osec; 1481 1482 /* We are turning this relocation into one 1483 against a section symbol. It would be 1484 proper to subtract the symbol's value, 1485 osec->vma, from the emitted reloc addend, 1486 but ld.so expects buggy relocs. */ 1487 osec = sec->output_section; 1488 indx = elf_section_data (osec)->dynindx; 1489 if (indx == 0) 1490 { 1491 struct elf_link_hash_table *htab; 1492 htab = elf_hash_table (info); 1493 osec = htab->text_index_section; 1494 indx = elf_section_data (osec)->dynindx; 1495 } 1496 BFD_ASSERT (indx != 0); 1497 } 1498 1499 outrel.r_info = ELF32_R_INFO (indx, r_type); 1500 outrel.r_addend = relocation + rel->r_addend; 1501 } 1502 } 1503 1504 if ((input_section->flags & SEC_CODE) != 0 1505 || (ELF32_R_TYPE (outrel.r_info) != R_VAX_32 1506 && ELF32_R_TYPE (outrel.r_info) != R_VAX_RELATIVE 1507 && ELF32_R_TYPE (outrel.r_info) != R_VAX_COPY 1508 && ELF32_R_TYPE (outrel.r_info) != R_VAX_JMP_SLOT 1509 && ELF32_R_TYPE (outrel.r_info) != R_VAX_GLOB_DAT)) 1510 { 1511 if (h != NULL) 1512 _bfd_error_handler 1513 /* xgettext:c-format */ 1514 (_("%pB: warning: %s relocation against symbol `%s'" 1515 " from %pA section"), 1516 input_bfd, howto->name, h->root.root.string, 1517 input_section); 1518 else 1519 _bfd_error_handler 1520 /* xgettext:c-format */ 1521 (_("%pB: warning: %s relocation to %#" PRIx64 1522 " from %pA section"), 1523 input_bfd, howto->name, (uint64_t) outrel.r_addend, 1524 input_section); 1525 } 1526 loc = sreloc->contents; 1527 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1528 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1529 1530 /* This reloc will be computed at runtime, so there's no 1531 need to do anything now, except for R_VAX_32 1532 relocations that have been turned into 1533 R_VAX_RELATIVE. */ 1534 if (!relocate) 1535 continue; 1536 } 1537 1538 break; 1539 1540 case R_VAX_GNU_VTINHERIT: 1541 case R_VAX_GNU_VTENTRY: 1542 /* These are no-ops in the end. */ 1543 continue; 1544 1545 default: 1546 break; 1547 } 1548 1549 /* VAX PCREL relocations are from the end of relocation, not the start. 1550 So subtract the difference from the relocation amount since we can't 1551 add it to the offset. */ 1552 if (howto->pc_relative && howto->pcrel_offset) 1553 relocation -= bfd_get_reloc_size(howto); 1554 1555 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1556 contents, rel->r_offset, 1557 relocation, rel->r_addend); 1558 1559 if (r != bfd_reloc_ok) 1560 { 1561 switch (r) 1562 { 1563 default: 1564 case bfd_reloc_outofrange: 1565 abort (); 1566 case bfd_reloc_overflow: 1567 { 1568 const char *name; 1569 1570 if (h != NULL) 1571 name = NULL; 1572 else 1573 { 1574 name = bfd_elf_string_from_elf_section (input_bfd, 1575 symtab_hdr->sh_link, 1576 sym->st_name); 1577 if (name == NULL) 1578 return false; 1579 if (*name == '\0') 1580 name = bfd_section_name (sec); 1581 } 1582 info->callbacks->reloc_overflow 1583 (info, (h ? &h->root : NULL), name, howto->name, 1584 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1585 } 1586 break; 1587 } 1588 } 1589 } 1590 1591 return true; 1592 } 1593 1594 /* Finish up dynamic symbol handling. We set the contents of various 1595 dynamic sections here. */ 1596 1597 static bool 1598 elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info, 1599 struct elf_link_hash_entry *h, 1600 Elf_Internal_Sym *sym) 1601 { 1602 bfd *dynobj; 1603 1604 dynobj = elf_hash_table (info)->dynobj; 1605 1606 if (h->plt.offset != (bfd_vma) -1) 1607 { 1608 asection *splt; 1609 asection *sgot; 1610 asection *srela; 1611 bfd_vma plt_index; 1612 bfd_vma got_offset; 1613 bfd_vma addend; 1614 Elf_Internal_Rela rela; 1615 bfd_byte *loc; 1616 1617 /* This symbol has an entry in the procedure linkage table. Set 1618 it up. */ 1619 BFD_ASSERT (h->dynindx != -1); 1620 1621 splt = elf_hash_table (info)->splt; 1622 sgot = elf_hash_table (info)->sgotplt; 1623 srela = elf_hash_table (info)->srelplt; 1624 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 1625 1626 addend = 2 * (h->plt.offset & 1); 1627 h->plt.offset &= ~1; 1628 1629 /* Get the index in the procedure linkage table which 1630 corresponds to this symbol. This is the index of this symbol 1631 in all the symbols for which we are making plt entries. The 1632 first entry in the procedure linkage table is reserved. */ 1633 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1634 1635 /* Get the offset into the .got table of the entry that 1636 corresponds to this function. Each .got entry is 4 bytes. 1637 The first two are reserved. */ 1638 got_offset = (plt_index + 3) * 4; 1639 1640 /* Fill in the entry in the procedure linkage table. */ 1641 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry, 1642 PLT_ENTRY_SIZE); 1643 1644 /* The offset is relative to the first extension word. */ 1645 bfd_put_32 (output_bfd, 1646 -(h->plt.offset + 8), 1647 splt->contents + h->plt.offset + 4); 1648 1649 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 1650 splt->contents + h->plt.offset + 8); 1651 1652 /* Fill in the entry in the global offset table. */ 1653 bfd_put_32 (output_bfd, 1654 (splt->output_section->vma 1655 + splt->output_offset 1656 + h->plt.offset) + addend, 1657 sgot->contents + got_offset); 1658 1659 /* Fill in the entry in the .rela.plt section. */ 1660 rela.r_offset = (sgot->output_section->vma 1661 + sgot->output_offset 1662 + got_offset); 1663 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT); 1664 rela.r_addend = addend; 1665 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 1666 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1667 1668 if (!h->def_regular) 1669 { 1670 /* Mark the symbol as undefined, rather than as defined in 1671 the .plt section. Leave the value alone. */ 1672 sym->st_shndx = SHN_UNDEF; 1673 } 1674 } 1675 1676 if (h->got.offset != (bfd_vma) -1) 1677 { 1678 asection *sgot; 1679 asection *srela; 1680 Elf_Internal_Rela rela; 1681 bfd_byte *loc; 1682 1683 /* This symbol has an entry in the global offset table. Set it 1684 up. */ 1685 sgot = elf_hash_table (info)->sgot; 1686 srela = elf_hash_table (info)->srelgot; 1687 BFD_ASSERT (sgot != NULL && srela != NULL); 1688 1689 rela.r_offset = (sgot->output_section->vma 1690 + sgot->output_offset 1691 + h->got.offset); 1692 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT); 1693 rela.r_addend = bfd_get_signed_32 (output_bfd, 1694 sgot->contents + h->got.offset); 1695 1696 loc = srela->contents; 1697 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 1698 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1699 } 1700 1701 if (h->needs_copy) 1702 { 1703 asection *s; 1704 Elf_Internal_Rela rela; 1705 bfd_byte *loc; 1706 1707 /* This symbol needs a copy reloc. Set it up. */ 1708 BFD_ASSERT (h->dynindx != -1 1709 && (h->root.type == bfd_link_hash_defined 1710 || h->root.type == bfd_link_hash_defweak)); 1711 1712 s = bfd_get_linker_section (dynobj, ".rela.bss"); 1713 BFD_ASSERT (s != NULL); 1714 1715 rela.r_offset = (h->root.u.def.value 1716 + h->root.u.def.section->output_section->vma 1717 + h->root.u.def.section->output_offset); 1718 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY); 1719 rela.r_addend = 0; 1720 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 1721 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1722 } 1723 1724 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 1725 if (h == elf_hash_table (info)->hdynamic 1726 || h == elf_hash_table (info)->hgot) 1727 sym->st_shndx = SHN_ABS; 1728 1729 return true; 1730 } 1731 1732 /* Finish up the dynamic sections. */ 1733 1734 static bool 1735 elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 1736 { 1737 bfd *dynobj; 1738 asection *sgot; 1739 asection *sdyn; 1740 1741 dynobj = elf_hash_table (info)->dynobj; 1742 1743 sgot = elf_hash_table (info)->sgotplt; 1744 BFD_ASSERT (sgot != NULL); 1745 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 1746 1747 if (elf_hash_table (info)->dynamic_sections_created) 1748 { 1749 asection *splt; 1750 Elf32_External_Dyn *dyncon, *dynconend; 1751 1752 splt = elf_hash_table (info)->splt; 1753 BFD_ASSERT (splt != NULL && sdyn != NULL); 1754 1755 dyncon = (Elf32_External_Dyn *) sdyn->contents; 1756 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 1757 for (; dyncon < dynconend; dyncon++) 1758 { 1759 Elf_Internal_Dyn dyn; 1760 asection *s; 1761 1762 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 1763 1764 switch (dyn.d_tag) 1765 { 1766 default: 1767 break; 1768 1769 case DT_PLTGOT: 1770 s = elf_hash_table (info)->sgotplt; 1771 goto get_vma; 1772 case DT_JMPREL: 1773 s = elf_hash_table (info)->srelplt; 1774 get_vma: 1775 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 1776 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1777 break; 1778 1779 case DT_PLTRELSZ: 1780 s = elf_hash_table (info)->srelplt; 1781 dyn.d_un.d_val = s->size; 1782 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1783 break; 1784 } 1785 } 1786 1787 /* Fill in the first entry in the procedure linkage table. */ 1788 if (splt->size > 0) 1789 { 1790 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE); 1791 bfd_put_32 (output_bfd, 1792 (sgot->output_section->vma 1793 + sgot->output_offset + 4 1794 - (splt->output_section->vma + 6)), 1795 splt->contents + 2); 1796 bfd_put_32 (output_bfd, 1797 (sgot->output_section->vma 1798 + sgot->output_offset + 8 1799 - (splt->output_section->vma + 12)), 1800 splt->contents + 8); 1801 elf_section_data (splt->output_section)->this_hdr.sh_entsize 1802 = PLT_ENTRY_SIZE; 1803 } 1804 } 1805 1806 /* Fill in the first three entries in the global offset table. */ 1807 if (sgot->size > 0) 1808 { 1809 if (sdyn == NULL) 1810 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 1811 else 1812 bfd_put_32 (output_bfd, 1813 sdyn->output_section->vma + sdyn->output_offset, 1814 sgot->contents); 1815 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 1816 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 1817 } 1818 1819 if (elf_section_data (sgot->output_section) != NULL) 1820 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 1821 1822 return true; 1823 } 1824 1825 static enum elf_reloc_type_class 1826 elf_vax_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 1827 const asection *rel_sec ATTRIBUTE_UNUSED, 1828 const Elf_Internal_Rela *rela) 1829 { 1830 switch ((int) ELF32_R_TYPE (rela->r_info)) 1831 { 1832 case R_VAX_RELATIVE: 1833 return reloc_class_relative; 1834 case R_VAX_JMP_SLOT: 1835 return reloc_class_plt; 1836 case R_VAX_COPY: 1837 return reloc_class_copy; 1838 default: 1839 return reloc_class_normal; 1840 } 1841 } 1842 1843 static bfd_vma 1844 elf_vax_plt_sym_val (bfd_vma i, const asection *plt, 1845 const arelent *rel ATTRIBUTE_UNUSED) 1846 { 1847 return plt->vma + (i + 1) * PLT_ENTRY_SIZE; 1848 } 1849 1850 #define TARGET_LITTLE_SYM vax_elf32_vec 1851 #define TARGET_LITTLE_NAME "elf32-vax" 1852 #define ELF_MACHINE_CODE EM_VAX 1853 #define ELF_MAXPAGESIZE 0x1000 1854 1855 #define elf_backend_create_dynamic_sections \ 1856 _bfd_elf_create_dynamic_sections 1857 #define bfd_elf32_bfd_link_hash_table_create \ 1858 elf_vax_link_hash_table_create 1859 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link 1860 1861 #define elf_backend_check_relocs elf_vax_check_relocs 1862 #define elf_backend_adjust_dynamic_symbol \ 1863 elf_vax_adjust_dynamic_symbol 1864 #define elf_backend_always_size_sections \ 1865 elf_vax_always_size_sections 1866 #define elf_backend_size_dynamic_sections \ 1867 elf_vax_size_dynamic_sections 1868 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 1869 #define elf_backend_relocate_section elf_vax_relocate_section 1870 #define elf_backend_finish_dynamic_symbol \ 1871 elf_vax_finish_dynamic_symbol 1872 #define elf_backend_finish_dynamic_sections \ 1873 elf_vax_finish_dynamic_sections 1874 #define elf_backend_reloc_type_class elf_vax_reloc_type_class 1875 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook 1876 #define elf_backend_plt_sym_val elf_vax_plt_sym_val 1877 #define bfd_elf32_bfd_merge_private_bfd_data \ 1878 elf32_vax_merge_private_bfd_data 1879 #define bfd_elf32_bfd_set_private_flags \ 1880 elf32_vax_set_private_flags 1881 #define bfd_elf32_bfd_print_private_bfd_data \ 1882 elf32_vax_print_private_bfd_data 1883 1884 #define elf_backend_can_gc_sections 1 1885 #define elf_backend_want_got_plt 1 1886 #define elf_backend_plt_readonly 1 1887 #define elf_backend_want_plt_sym 0 1888 #define elf_backend_got_header_size 16 1889 #define elf_backend_rela_normal 1 1890 #define elf_backend_dtrel_excludes_plt 1 1891 1892 #include "elf32-target.h" 1893