1 /* VAX series support for 32-bit ELF 2 Copyright (C) 1993-2020 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 bfd_boolean 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 bfd_boolean elf_vax_check_relocs (bfd *, struct bfd_link_info *, 36 asection *, const Elf_Internal_Rela *); 37 static bfd_boolean elf_vax_adjust_dynamic_symbol (struct bfd_link_info *, 38 struct elf_link_hash_entry *); 39 static bfd_boolean elf_vax_size_dynamic_sections (bfd *, struct bfd_link_info *); 40 static bfd_boolean 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 bfd_boolean elf_vax_finish_dynamic_symbol (bfd *, struct bfd_link_info *, 45 struct elf_link_hash_entry *, 46 Elf_Internal_Sym *); 47 static bfd_boolean elf_vax_finish_dynamic_sections (bfd *, 48 struct bfd_link_info *); 49 static bfd_vma elf_vax_plt_sym_val (bfd_vma, const asection *, 50 const arelent *); 51 52 static bfd_boolean elf32_vax_set_private_flags (bfd *, flagword); 53 static bfd_boolean elf32_vax_print_private_bfd_data (bfd *, void *); 54 55 static reloc_howto_type howto_table[] = { 56 HOWTO (R_VAX_NONE, /* type */ 57 0, /* rightshift */ 58 3, /* size (0 = byte, 1 = short, 2 = long) */ 59 0, /* bitsize */ 60 FALSE, /* pc_relative */ 61 0, /* bitpos */ 62 complain_overflow_dont, /* complain_on_overflow */ 63 bfd_elf_generic_reloc, /* special_function */ 64 "R_VAX_NONE", /* name */ 65 FALSE, /* partial_inplace */ 66 0, /* src_mask */ 67 0x00000000, /* dst_mask */ 68 FALSE), /* pcrel_offset */ 69 70 HOWTO (R_VAX_32, /* type */ 71 0, /* rightshift */ 72 2, /* size (0 = byte, 1 = short, 2 = long) */ 73 32, /* bitsize */ 74 FALSE, /* pc_relative */ 75 0, /* bitpos */ 76 complain_overflow_bitfield, /* complain_on_overflow */ 77 bfd_elf_generic_reloc, /* special_function */ 78 "R_VAX_32", /* name */ 79 FALSE, /* partial_inplace */ 80 0, /* src_mask */ 81 0xffffffff, /* dst_mask */ 82 FALSE), /* pcrel_offset */ 83 84 HOWTO (R_VAX_16, /* type */ 85 0, /* rightshift */ 86 1, /* size (0 = byte, 1 = short, 2 = long) */ 87 16, /* bitsize */ 88 FALSE, /* pc_relative */ 89 0, /* bitpos */ 90 complain_overflow_bitfield, /* complain_on_overflow */ 91 bfd_elf_generic_reloc, /* special_function */ 92 "R_VAX_16", /* name */ 93 FALSE, /* partial_inplace */ 94 0, /* src_mask */ 95 0x0000ffff, /* dst_mask */ 96 FALSE), /* pcrel_offset */ 97 98 HOWTO (R_VAX_8, /* type */ 99 0, /* rightshift */ 100 0, /* size (0 = byte, 1 = short, 2 = long) */ 101 8, /* bitsize */ 102 FALSE, /* pc_relative */ 103 0, /* bitpos */ 104 complain_overflow_bitfield, /* complain_on_overflow */ 105 bfd_elf_generic_reloc, /* special_function */ 106 "R_VAX_8", /* name */ 107 FALSE, /* partial_inplace */ 108 0, /* src_mask */ 109 0x000000ff, /* dst_mask */ 110 FALSE), /* pcrel_offset */ 111 112 HOWTO (R_VAX_PC32, /* type */ 113 0, /* rightshift */ 114 2, /* size (0 = byte, 1 = short, 2 = long) */ 115 32, /* bitsize */ 116 TRUE, /* pc_relative */ 117 0, /* bitpos */ 118 complain_overflow_bitfield, /* complain_on_overflow */ 119 bfd_elf_generic_reloc, /* special_function */ 120 "R_VAX_PC32", /* name */ 121 FALSE, /* partial_inplace */ 122 0, /* src_mask */ 123 0xffffffff, /* dst_mask */ 124 TRUE), /* pcrel_offset */ 125 126 HOWTO (R_VAX_PC16, /* type */ 127 0, /* rightshift */ 128 1, /* size (0 = byte, 1 = short, 2 = long) */ 129 16, /* bitsize */ 130 TRUE, /* pc_relative */ 131 0, /* bitpos */ 132 complain_overflow_signed, /* complain_on_overflow */ 133 bfd_elf_generic_reloc, /* special_function */ 134 "R_VAX_PC16", /* name */ 135 FALSE, /* partial_inplace */ 136 0, /* src_mask */ 137 0x0000ffff, /* dst_mask */ 138 TRUE), /* pcrel_offset */ 139 140 HOWTO (R_VAX_PC8, /* type */ 141 0, /* rightshift */ 142 0, /* size (0 = byte, 1 = short, 2 = long) */ 143 8, /* bitsize */ 144 TRUE, /* pc_relative */ 145 0, /* bitpos */ 146 complain_overflow_signed, /* complain_on_overflow */ 147 bfd_elf_generic_reloc, /* special_function */ 148 "R_VAX_PC8", /* name */ 149 FALSE, /* partial_inplace */ 150 0, /* src_mask */ 151 0x000000ff, /* dst_mask */ 152 TRUE), /* pcrel_offset */ 153 154 HOWTO (R_VAX_GOT32, /* type */ 155 0, /* rightshift */ 156 2, /* size (0 = byte, 1 = short, 2 = long) */ 157 32, /* bitsize */ 158 TRUE, /* pc_relative */ 159 0, /* bitpos */ 160 complain_overflow_bitfield, /* complain_on_overflow */ 161 bfd_elf_generic_reloc, /* special_function */ 162 "R_VAX_GOT32", /* name */ 163 FALSE, /* partial_inplace */ 164 0, /* src_mask */ 165 0xffffffff, /* dst_mask */ 166 TRUE), /* pcrel_offset */ 167 168 EMPTY_HOWTO (-1), 169 EMPTY_HOWTO (-1), 170 EMPTY_HOWTO (-1), 171 EMPTY_HOWTO (-1), 172 EMPTY_HOWTO (-1), 173 174 HOWTO (R_VAX_PLT32, /* type */ 175 0, /* rightshift */ 176 2, /* size (0 = byte, 1 = short, 2 = long) */ 177 32, /* bitsize */ 178 TRUE, /* pc_relative */ 179 0, /* bitpos */ 180 complain_overflow_bitfield, /* complain_on_overflow */ 181 bfd_elf_generic_reloc, /* special_function */ 182 "R_VAX_PLT32", /* name */ 183 FALSE, /* partial_inplace */ 184 0, /* src_mask */ 185 0xffffffff, /* dst_mask */ 186 TRUE), /* pcrel_offset */ 187 188 EMPTY_HOWTO (-1), 189 EMPTY_HOWTO (-1), 190 EMPTY_HOWTO (-1), 191 EMPTY_HOWTO (-1), 192 EMPTY_HOWTO (-1), 193 194 HOWTO (R_VAX_COPY, /* type */ 195 0, /* rightshift */ 196 0, /* size (0 = byte, 1 = short, 2 = long) */ 197 0, /* bitsize */ 198 FALSE, /* pc_relative */ 199 0, /* bitpos */ 200 complain_overflow_dont, /* complain_on_overflow */ 201 bfd_elf_generic_reloc, /* special_function */ 202 "R_VAX_COPY", /* name */ 203 FALSE, /* partial_inplace */ 204 0, /* src_mask */ 205 0xffffffff, /* dst_mask */ 206 FALSE), /* pcrel_offset */ 207 208 HOWTO (R_VAX_GLOB_DAT, /* type */ 209 0, /* rightshift */ 210 2, /* size (0 = byte, 1 = short, 2 = long) */ 211 32, /* bitsize */ 212 FALSE, /* pc_relative */ 213 0, /* bitpos */ 214 complain_overflow_dont, /* complain_on_overflow */ 215 bfd_elf_generic_reloc, /* special_function */ 216 "R_VAX_GLOB_DAT", /* name */ 217 FALSE, /* partial_inplace */ 218 0, /* src_mask */ 219 0xffffffff, /* dst_mask */ 220 FALSE), /* pcrel_offset */ 221 222 HOWTO (R_VAX_JMP_SLOT, /* type */ 223 0, /* rightshift */ 224 2, /* size (0 = byte, 1 = short, 2 = long) */ 225 32, /* bitsize */ 226 FALSE, /* pc_relative */ 227 0, /* bitpos */ 228 complain_overflow_dont, /* complain_on_overflow */ 229 bfd_elf_generic_reloc, /* special_function */ 230 "R_VAX_JMP_SLOT", /* name */ 231 FALSE, /* partial_inplace */ 232 0, /* src_mask */ 233 0xffffffff, /* dst_mask */ 234 FALSE), /* pcrel_offset */ 235 236 HOWTO (R_VAX_RELATIVE, /* type */ 237 0, /* rightshift */ 238 2, /* size (0 = byte, 1 = short, 2 = long) */ 239 32, /* bitsize */ 240 FALSE, /* pc_relative */ 241 0, /* bitpos */ 242 complain_overflow_dont, /* complain_on_overflow */ 243 bfd_elf_generic_reloc, /* special_function */ 244 "R_VAX_RELATIVE", /* name */ 245 FALSE, /* partial_inplace */ 246 0, /* src_mask */ 247 0xffffffff, /* dst_mask */ 248 FALSE), /* pcrel_offset */ 249 250 /* GNU extension to record C++ vtable hierarchy */ 251 HOWTO (R_VAX_GNU_VTINHERIT, /* type */ 252 0, /* rightshift */ 253 2, /* size (0 = byte, 1 = short, 2 = long) */ 254 0, /* bitsize */ 255 FALSE, /* pc_relative */ 256 0, /* bitpos */ 257 complain_overflow_dont, /* complain_on_overflow */ 258 NULL, /* special_function */ 259 "R_VAX_GNU_VTINHERIT", /* name */ 260 FALSE, /* partial_inplace */ 261 0, /* src_mask */ 262 0, /* dst_mask */ 263 FALSE), /* pcrel_offset */ 264 265 /* GNU extension to record C++ vtable member usage */ 266 HOWTO (R_VAX_GNU_VTENTRY, /* type */ 267 0, /* rightshift */ 268 2, /* size (0 = byte, 1 = short, 2 = long) */ 269 0, /* bitsize */ 270 FALSE, /* pc_relative */ 271 0, /* bitpos */ 272 complain_overflow_dont, /* complain_on_overflow */ 273 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 274 "R_VAX_GNU_VTENTRY", /* name */ 275 FALSE, /* partial_inplace */ 276 0, /* src_mask */ 277 0, /* dst_mask */ 278 FALSE), /* pcrel_offset */ 279 }; 280 281 static bfd_boolean 282 rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst) 283 { 284 unsigned int r_type; 285 286 r_type = ELF32_R_TYPE (dst->r_info); 287 if (r_type >= R_VAX_max) 288 { 289 /* xgettext:c-format */ 290 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 291 abfd, r_type); 292 bfd_set_error (bfd_error_bad_value); 293 return FALSE; 294 } 295 cache_ptr->howto = &howto_table[r_type]; 296 return TRUE; 297 } 298 299 #define elf_info_to_howto rtype_to_howto 300 301 static const struct 302 { 303 bfd_reloc_code_real_type bfd_val; 304 int elf_val; 305 } reloc_map[] = { 306 { BFD_RELOC_NONE, R_VAX_NONE }, 307 { BFD_RELOC_32, R_VAX_32 }, 308 { BFD_RELOC_16, R_VAX_16 }, 309 { BFD_RELOC_8, R_VAX_8 }, 310 { BFD_RELOC_32_PCREL, R_VAX_PC32 }, 311 { BFD_RELOC_16_PCREL, R_VAX_PC16 }, 312 { BFD_RELOC_8_PCREL, R_VAX_PC8 }, 313 { BFD_RELOC_32_GOT_PCREL, R_VAX_GOT32 }, 314 { BFD_RELOC_32_PLT_PCREL, R_VAX_PLT32 }, 315 { BFD_RELOC_NONE, R_VAX_COPY }, 316 { BFD_RELOC_VAX_GLOB_DAT, R_VAX_GLOB_DAT }, 317 { BFD_RELOC_VAX_JMP_SLOT, R_VAX_JMP_SLOT }, 318 { BFD_RELOC_VAX_RELATIVE, R_VAX_RELATIVE }, 319 { BFD_RELOC_CTOR, R_VAX_32 }, 320 { BFD_RELOC_VTABLE_INHERIT, R_VAX_GNU_VTINHERIT }, 321 { BFD_RELOC_VTABLE_ENTRY, R_VAX_GNU_VTENTRY }, 322 }; 323 324 static reloc_howto_type * 325 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code) 326 { 327 unsigned int i; 328 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) 329 { 330 if (reloc_map[i].bfd_val == code) 331 return &howto_table[reloc_map[i].elf_val]; 332 } 333 return 0; 334 } 335 336 static reloc_howto_type * 337 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 338 const char *r_name) 339 { 340 unsigned int i; 341 342 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) 343 if (howto_table[i].name != NULL 344 && strcasecmp (howto_table[i].name, r_name) == 0) 345 return &howto_table[i]; 346 347 return NULL; 348 } 349 350 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup 351 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup 352 #define ELF_ARCH bfd_arch_vax 353 /* end code generated by elf.el */ 354 355 /* Functions for the VAX ELF linker. */ 356 357 /* The name of the dynamic interpreter. This is put in the .interp 358 section. */ 359 360 #define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so" 361 362 /* The size in bytes of an entry in the procedure linkage table. */ 363 364 #define PLT_ENTRY_SIZE 12 365 366 /* The first entry in a procedure linkage table looks like this. See 367 the SVR4 ABI VAX supplement to see how this works. */ 368 369 static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] = 370 { 371 0xdd, 0xef, /* pushl l^ */ 372 0, 0, 0, 0, /* offset to .plt.got + 4 */ 373 0x17, 0xff, /* jmp @L^(pc) */ 374 0, 0, 0, 0, /* offset to .plt.got + 8 */ 375 }; 376 377 /* Subsequent entries in a procedure linkage table look like this. */ 378 379 static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] = 380 { 381 0xfc, 0x0f, /* .word ^M<r11:r2> */ 382 0x16, 0xef, /* jsb L^(pc) */ 383 0, 0, 0, 0, /* replaced with offset to start of .plt */ 384 0, 0, 0, 0, /* index into .rela.plt */ 385 }; 386 387 /* The VAX linker needs to keep track of the number of relocs that it 388 decides to copy in check_relocs for each symbol. This is so that it 389 can discard PC relative relocs if it doesn't need them when linking 390 with -Bsymbolic. We store the information in a field extending the 391 regular ELF linker hash table. */ 392 393 /* This structure keeps track of the number of PC relative relocs we have 394 copied for a given symbol. */ 395 396 struct elf_vax_pcrel_relocs_copied 397 { 398 /* Next section. */ 399 struct elf_vax_pcrel_relocs_copied *next; 400 /* A section in dynobj. */ 401 asection *section; 402 /* Number of relocs copied in this section. */ 403 bfd_size_type count; 404 }; 405 406 /* VAX ELF linker hash entry. */ 407 408 struct elf_vax_link_hash_entry 409 { 410 struct elf_link_hash_entry root; 411 412 /* Number of PC relative relocs copied for this symbol. */ 413 struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied; 414 415 bfd_vma got_addend; 416 }; 417 418 /* Declare this now that the above structures are defined. */ 419 420 static bfd_boolean elf_vax_discard_copies (struct elf_vax_link_hash_entry *, 421 void *); 422 423 /* Declare this now that the above structures are defined. */ 424 425 static bfd_boolean elf_vax_instantiate_got_entries (struct elf_link_hash_entry *, 426 void *); 427 428 /* Traverse an VAX ELF linker hash table. */ 429 430 #define elf_vax_link_hash_traverse(table, func, info) \ 431 (elf_link_hash_traverse \ 432 ((table), \ 433 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \ 434 (info))) 435 436 /* Create an entry in an VAX ELF linker hash table. */ 437 438 static struct bfd_hash_entry * 439 elf_vax_link_hash_newfunc (struct bfd_hash_entry *entry, 440 struct bfd_hash_table *table, 441 const char *string) 442 { 443 struct elf_vax_link_hash_entry *ret = 444 (struct elf_vax_link_hash_entry *) entry; 445 446 /* Allocate the structure if it has not already been allocated by a 447 subclass. */ 448 if (ret == NULL) 449 ret = ((struct elf_vax_link_hash_entry *) 450 bfd_hash_allocate (table, 451 sizeof (struct elf_vax_link_hash_entry))); 452 if (ret == NULL) 453 return (struct bfd_hash_entry *) ret; 454 455 /* Call the allocation method of the superclass. */ 456 ret = ((struct elf_vax_link_hash_entry *) 457 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 458 table, string)); 459 if (ret != NULL) 460 { 461 ret->pcrel_relocs_copied = NULL; 462 } 463 464 return (struct bfd_hash_entry *) ret; 465 } 466 467 /* Create an VAX ELF linker hash table. */ 468 469 static struct bfd_link_hash_table * 470 elf_vax_link_hash_table_create (bfd *abfd) 471 { 472 struct elf_link_hash_table *ret; 473 size_t amt = sizeof (struct elf_link_hash_table); 474 475 ret = bfd_zmalloc (amt); 476 if (ret == NULL) 477 return NULL; 478 479 if (!_bfd_elf_link_hash_table_init (ret, abfd, 480 elf_vax_link_hash_newfunc, 481 sizeof (struct elf_vax_link_hash_entry), 482 GENERIC_ELF_DATA)) 483 { 484 free (ret); 485 return NULL; 486 } 487 488 return &ret->root; 489 } 490 491 /* Keep vax-specific flags in the ELF header */ 492 static bfd_boolean 493 elf32_vax_set_private_flags (bfd *abfd, flagword flags) 494 { 495 elf_elfheader (abfd)->e_flags = flags; 496 elf_flags_init (abfd) = TRUE; 497 return TRUE; 498 } 499 500 /* Merge backend specific data from an object file to the output 501 object file when linking. */ 502 static bfd_boolean 503 elf32_vax_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 504 { 505 bfd *obfd = info->output_bfd; 506 flagword in_flags; 507 508 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 509 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 510 return TRUE; 511 512 in_flags = elf_elfheader (ibfd)->e_flags; 513 514 if (!elf_flags_init (obfd)) 515 { 516 elf_flags_init (obfd) = TRUE; 517 elf_elfheader (obfd)->e_flags = in_flags; 518 } 519 520 return TRUE; 521 } 522 523 /* Display the flags field */ 524 static bfd_boolean 525 elf32_vax_print_private_bfd_data (bfd *abfd, void * ptr) 526 { 527 FILE *file = (FILE *) ptr; 528 529 BFD_ASSERT (abfd != NULL && ptr != NULL); 530 531 /* Print normal ELF private data. */ 532 _bfd_elf_print_private_bfd_data (abfd, ptr); 533 534 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ 535 536 /* xgettext:c-format */ 537 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 538 539 if (elf_elfheader (abfd)->e_flags & EF_VAX_NONPIC) 540 fprintf (file, _(" [nonpic]")); 541 542 if (elf_elfheader (abfd)->e_flags & EF_VAX_DFLOAT) 543 fprintf (file, _(" [d-float]")); 544 545 if (elf_elfheader (abfd)->e_flags & EF_VAX_GFLOAT) 546 fprintf (file, _(" [g-float]")); 547 548 fputc ('\n', file); 549 550 return TRUE; 551 } 552 /* Look through the relocs for a section during the first phase, and 553 allocate space in the global offset table or procedure linkage 554 table. */ 555 556 static bfd_boolean 557 elf_vax_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, 558 const Elf_Internal_Rela *relocs) 559 { 560 bfd *dynobj; 561 Elf_Internal_Shdr *symtab_hdr; 562 struct elf_link_hash_entry **sym_hashes; 563 const Elf_Internal_Rela *rel; 564 const Elf_Internal_Rela *rel_end; 565 asection *sreloc; 566 567 if (bfd_link_relocatable (info)) 568 return TRUE; 569 570 dynobj = elf_hash_table (info)->dynobj; 571 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 572 sym_hashes = elf_sym_hashes (abfd); 573 574 sreloc = NULL; 575 576 rel_end = relocs + sec->reloc_count; 577 for (rel = relocs; rel < rel_end; rel++) 578 { 579 unsigned long r_symndx; 580 struct elf_link_hash_entry *h; 581 582 r_symndx = ELF32_R_SYM (rel->r_info); 583 584 if (r_symndx < symtab_hdr->sh_info) 585 h = NULL; 586 else 587 { 588 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 589 while (h->root.type == bfd_link_hash_indirect 590 || h->root.type == bfd_link_hash_warning) 591 h = (struct elf_link_hash_entry *) h->root.u.i.link; 592 } 593 594 switch (ELF32_R_TYPE (rel->r_info)) 595 { 596 case R_VAX_GOT32: 597 BFD_ASSERT (h != NULL); 598 599 /* If this is a local symbol, we resolve it directly without 600 creating a global offset table entry. */ 601 if (h->forced_local 602 || h == elf_hash_table (info)->hgot 603 || h == elf_hash_table (info)->hplt) 604 break; 605 606 /* This symbol requires a global offset table entry. */ 607 608 if (dynobj == NULL) 609 { 610 /* Create the .got section. */ 611 elf_hash_table (info)->dynobj = dynobj = abfd; 612 if (!_bfd_elf_create_got_section (dynobj, info)) 613 return FALSE; 614 } 615 616 if (h != NULL) 617 { 618 struct elf_vax_link_hash_entry *eh; 619 620 eh = (struct elf_vax_link_hash_entry *) h; 621 if (h->got.refcount == -1) 622 { 623 h->got.refcount = 1; 624 eh->got_addend = rel->r_addend; 625 } 626 else 627 { 628 h->got.refcount++; 629 if (eh->got_addend != (bfd_vma) rel->r_addend) 630 _bfd_error_handler 631 /* xgettext:c-format */ 632 (_("%pB: warning: GOT addend of %" PRId64 " to `%s' does" 633 " not match previous GOT addend of %" PRId64), 634 abfd, (int64_t) rel->r_addend, h->root.root.string, 635 (int64_t) eh->got_addend); 636 637 } 638 } 639 break; 640 641 case R_VAX_PLT32: 642 /* This symbol requires a procedure linkage table entry. We 643 actually build the entry in adjust_dynamic_symbol, 644 because this might be a case of linking PIC code which is 645 never referenced by a dynamic object, in which case we 646 don't need to generate a procedure linkage table entry 647 after all. */ 648 BFD_ASSERT (h != NULL); 649 650 /* If this is a local symbol, we resolve it directly without 651 creating a procedure linkage table entry. */ 652 if (h->forced_local) 653 break; 654 655 h->needs_plt = 1; 656 if (h->plt.refcount == -1) 657 h->plt.refcount = 1; 658 else 659 h->plt.refcount++; 660 break; 661 662 case R_VAX_PC8: 663 case R_VAX_PC16: 664 case R_VAX_PC32: 665 /* If we are creating a shared library and this is not a local 666 symbol, we need to copy the reloc into the shared library. 667 However when linking with -Bsymbolic and this is a global 668 symbol which is defined in an object we are including in the 669 link (i.e., DEF_REGULAR is set), then we can resolve the 670 reloc directly. At this point we have not seen all the input 671 files, so it is possible that DEF_REGULAR is not set now but 672 will be set later (it is never cleared). We account for that 673 possibility below by storing information in the 674 pcrel_relocs_copied field of the hash table entry. */ 675 if (!(bfd_link_pic (info) 676 && (sec->flags & SEC_ALLOC) != 0 677 && h != NULL 678 && (!info->symbolic 679 || !h->def_regular))) 680 { 681 if (h != NULL 682 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 683 && !h->forced_local) 684 { 685 /* Make sure a plt entry is created for this symbol if 686 it turns out to be a function defined by a dynamic 687 object. */ 688 if (h->plt.refcount == -1) 689 h->plt.refcount = 1; 690 else 691 h->plt.refcount++; 692 } 693 break; 694 } 695 /* If this is a local symbol, we can resolve it directly. */ 696 if (h != NULL 697 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 698 || h->forced_local)) 699 break; 700 701 /* Fall through. */ 702 case R_VAX_8: 703 case R_VAX_16: 704 case R_VAX_32: 705 if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) 706 { 707 /* Make sure a plt entry is created for this symbol if it 708 turns out to be a function defined by a dynamic object. */ 709 if (h->plt.refcount == -1) 710 h->plt.refcount = 1; 711 else 712 h->plt.refcount++; 713 } 714 715 /* Non-GOT reference may need a copy reloc in executable or 716 a dynamic reloc in shared library. */ 717 if (h != NULL) 718 h->non_got_ref = 1; 719 720 /* If we are creating a shared library, we need to copy the 721 reloc into the shared library. */ 722 if (bfd_link_pic (info) 723 && (sec->flags & SEC_ALLOC) != 0) 724 { 725 /* When creating a shared object, we must copy these 726 reloc types into the output file. We create a reloc 727 section in dynobj and make room for this reloc. */ 728 if (sreloc == NULL) 729 { 730 sreloc = _bfd_elf_make_dynamic_reloc_section 731 (sec, dynobj, 2, abfd, /*rela?*/ TRUE); 732 733 if (sreloc == NULL) 734 return FALSE; 735 736 if (sec->flags & SEC_READONLY) 737 info->flags |= DF_TEXTREL; 738 } 739 740 sreloc->size += sizeof (Elf32_External_Rela); 741 742 /* If we are linking with -Bsymbolic, we count the number of 743 PC relative relocations we have entered for this symbol, 744 so that we can discard them again if the symbol is later 745 defined by a regular object. Note that this function is 746 only called if we are using a vaxelf linker hash table, 747 which means that h is really a pointer to an 748 elf_vax_link_hash_entry. */ 749 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8 750 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16 751 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32) 752 && info->symbolic) 753 { 754 struct elf_vax_link_hash_entry *eh; 755 struct elf_vax_pcrel_relocs_copied *p; 756 757 eh = (struct elf_vax_link_hash_entry *) h; 758 759 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) 760 if (p->section == sreloc) 761 break; 762 763 if (p == NULL) 764 { 765 p = ((struct elf_vax_pcrel_relocs_copied *) 766 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 767 if (p == NULL) 768 return FALSE; 769 p->next = eh->pcrel_relocs_copied; 770 eh->pcrel_relocs_copied = p; 771 p->section = sreloc; 772 p->count = 0; 773 } 774 775 ++p->count; 776 } 777 } 778 779 break; 780 781 /* This relocation describes the C++ object vtable hierarchy. 782 Reconstruct it for later use during GC. */ 783 case R_VAX_GNU_VTINHERIT: 784 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 785 return FALSE; 786 break; 787 788 /* This relocation describes which C++ vtable entries are actually 789 used. Record for later use during GC. */ 790 case R_VAX_GNU_VTENTRY: 791 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 792 return FALSE; 793 break; 794 795 default: 796 break; 797 } 798 } 799 800 return TRUE; 801 } 802 803 /* Return the section that should be marked against GC for a given 804 relocation. */ 805 806 static asection * 807 elf_vax_gc_mark_hook (asection *sec, 808 struct bfd_link_info *info, 809 Elf_Internal_Rela *rel, 810 struct elf_link_hash_entry *h, 811 Elf_Internal_Sym *sym) 812 { 813 if (h != NULL) 814 switch (ELF32_R_TYPE (rel->r_info)) 815 { 816 case R_VAX_GNU_VTINHERIT: 817 case R_VAX_GNU_VTENTRY: 818 return NULL; 819 } 820 821 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 822 } 823 824 /* Adjust a symbol defined by a dynamic object and referenced by a 825 regular object. The current definition is in some section of the 826 dynamic object, but we're not including those sections. We have to 827 change the definition to something the rest of the link can 828 understand. */ 829 830 static bfd_boolean 831 elf_vax_adjust_dynamic_symbol (struct bfd_link_info *info, 832 struct elf_link_hash_entry *h) 833 { 834 bfd *dynobj; 835 asection *s; 836 837 dynobj = elf_hash_table (info)->dynobj; 838 839 /* Make sure we know what is going on here. */ 840 BFD_ASSERT (dynobj != NULL 841 && (h->needs_plt 842 || h->is_weakalias 843 || (h->def_dynamic 844 && h->ref_regular 845 && !h->def_regular))); 846 847 /* If this is a function, put it in the procedure linkage table. We 848 will fill in the contents of the procedure linkage table later, 849 when we know the address of the .got section. */ 850 if (h->type == STT_FUNC 851 || h->needs_plt) 852 { 853 if (h->plt.refcount <= 0 854 || SYMBOL_CALLS_LOCAL (info, h) 855 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 856 && h->root.type == bfd_link_hash_undefweak)) 857 { 858 /* This case can occur if we saw a PLTxx reloc in an input 859 file, but the symbol was never referred to by a dynamic 860 object, or if all references were garbage collected. In 861 such a case, we don't actually need to build a procedure 862 linkage table, and we can just do a PCxx reloc instead. */ 863 h->plt.offset = (bfd_vma) -1; 864 h->needs_plt = 0; 865 return TRUE; 866 } 867 868 s = elf_hash_table (info)->splt; 869 BFD_ASSERT (s != NULL); 870 871 /* If this is the first .plt entry, make room for the special 872 first entry. */ 873 if (s->size == 0) 874 { 875 s->size += PLT_ENTRY_SIZE; 876 } 877 878 /* If this symbol is not defined in a regular file, and we are 879 not generating a shared library, then set the symbol to this 880 location in the .plt. This is required to make function 881 pointers compare as equal between the normal executable and 882 the shared library. */ 883 if (!bfd_link_pic (info) 884 && !h->def_regular) 885 { 886 h->root.u.def.section = s; 887 h->root.u.def.value = s->size; 888 } 889 890 h->plt.offset = s->size; 891 892 /* Make room for this entry. */ 893 s->size += PLT_ENTRY_SIZE; 894 895 /* We also need to make an entry in the .got.plt section, which 896 will be placed in the .got section by the linker script. */ 897 898 s = elf_hash_table (info)->sgotplt; 899 BFD_ASSERT (s != NULL); 900 s->size += 4; 901 902 /* We also need to make an entry in the .rela.plt section. */ 903 904 s = elf_hash_table (info)->srelplt; 905 BFD_ASSERT (s != NULL); 906 s->size += sizeof (Elf32_External_Rela); 907 908 return TRUE; 909 } 910 911 /* Reinitialize the plt offset now that it is not used as a reference 912 count any more. */ 913 h->plt.offset = (bfd_vma) -1; 914 915 /* If this is a weak symbol, and there is a real definition, the 916 processor independent code will have arranged for us to see the 917 real definition first, and we can just use the same value. */ 918 if (h->is_weakalias) 919 { 920 struct elf_link_hash_entry *def = weakdef (h); 921 BFD_ASSERT (def->root.type == bfd_link_hash_defined); 922 h->root.u.def.section = def->root.u.def.section; 923 h->root.u.def.value = def->root.u.def.value; 924 return TRUE; 925 } 926 927 /* This is a reference to a symbol defined by a dynamic object which 928 is not a function. */ 929 930 /* If we are creating a shared library, we must presume that the 931 only references to the symbol are via the global offset table. 932 For such cases we need not do anything here; the relocations will 933 be handled correctly by relocate_section. */ 934 if (bfd_link_pic (info)) 935 return TRUE; 936 937 /* If there are no references to this symbol that do not use the 938 GOT relocation, we don't need to generate a copy reloc. */ 939 if (!h->non_got_ref) 940 return TRUE; 941 942 /* We must allocate the symbol in our .dynbss section, which will 943 become part of the .bss section of the executable. There will be 944 an entry for this symbol in the .dynsym section. The dynamic 945 object will contain position independent code, so all references 946 from the dynamic object to this symbol will go through the global 947 offset table. The dynamic linker will use the .dynsym entry to 948 determine the address it must put in the global offset table, so 949 both the dynamic object and the regular object will refer to the 950 same memory location for the variable. */ 951 952 s = bfd_get_linker_section (dynobj, ".dynbss"); 953 BFD_ASSERT (s != NULL); 954 955 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to 956 copy the initial value out of the dynamic object and into the 957 runtime process image. We need to remember the offset into the 958 .rela.bss section we are going to use. */ 959 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 960 { 961 asection *srel; 962 963 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 964 BFD_ASSERT (srel != NULL); 965 srel->size += sizeof (Elf32_External_Rela); 966 h->needs_copy = 1; 967 } 968 969 return _bfd_elf_adjust_dynamic_copy (info, h, s); 970 } 971 972 /* This function is called via elf_link_hash_traverse. It resets GOT 973 and PLT (.GOT) reference counts back to -1 so normal PC32 relocation 974 will be done. */ 975 976 static bfd_boolean 977 elf_vax_discard_got_entries (struct elf_link_hash_entry *h, 978 void *infoptr ATTRIBUTE_UNUSED) 979 { 980 h->got.refcount = -1; 981 h->plt.refcount = -1; 982 983 return TRUE; 984 } 985 986 /* Discard unused dynamic data if this is a static link. */ 987 988 static bfd_boolean 989 elf_vax_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 990 struct bfd_link_info *info) 991 { 992 bfd *dynobj; 993 asection *s; 994 995 dynobj = elf_hash_table (info)->dynobj; 996 997 if (dynobj && !elf_hash_table (info)->dynamic_sections_created) 998 { 999 /* We may have created entries in the .rela.got and .got sections. 1000 However, if we are not creating the dynamic sections, we will 1001 not actually use these entries. Reset the size of .rela.got 1002 and .got, which will cause them to get stripped from the output 1003 file below. */ 1004 s = elf_hash_table (info)->srelgot; 1005 if (s != NULL) 1006 s->size = 0; 1007 s = elf_hash_table (info)->sgotplt; 1008 if (s != NULL) 1009 s->size = 0; 1010 s = elf_hash_table (info)->sgot; 1011 if (s != NULL) 1012 s->size = 0; 1013 } 1014 1015 /* If this is a static link, we need to discard all the got entries we've 1016 recorded. */ 1017 if (!dynobj || !elf_hash_table (info)->dynamic_sections_created) 1018 elf_link_hash_traverse (elf_hash_table (info), 1019 elf_vax_discard_got_entries, 1020 info); 1021 1022 return TRUE; 1023 } 1024 1025 /* Set the sizes of the dynamic sections. */ 1026 1027 static bfd_boolean 1028 elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 1029 { 1030 bfd *dynobj; 1031 asection *s; 1032 bfd_boolean relocs; 1033 1034 dynobj = elf_hash_table (info)->dynobj; 1035 BFD_ASSERT (dynobj != NULL); 1036 1037 if (elf_hash_table (info)->dynamic_sections_created) 1038 { 1039 /* Set the contents of the .interp section to the interpreter. */ 1040 if (bfd_link_executable (info) && !info->nointerp) 1041 { 1042 s = bfd_get_linker_section (dynobj, ".interp"); 1043 BFD_ASSERT (s != NULL); 1044 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1045 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1046 } 1047 } 1048 1049 /* If this is a -Bsymbolic shared link, then we need to discard all PC 1050 relative relocs against symbols defined in a regular object. We 1051 allocated space for them in the check_relocs routine, but we will not 1052 fill them in in the relocate_section routine. */ 1053 if (bfd_link_pic (info) && info->symbolic) 1054 elf_vax_link_hash_traverse (elf_hash_table (info), 1055 elf_vax_discard_copies, 1056 NULL); 1057 1058 /* If this is a -Bsymbolic shared link, we need to discard all the got 1059 entries we've recorded. Otherwise, we need to instantiate (allocate 1060 space for them). */ 1061 elf_link_hash_traverse (elf_hash_table (info), 1062 elf_vax_instantiate_got_entries, 1063 info); 1064 1065 /* The check_relocs and adjust_dynamic_symbol entry points have 1066 determined the sizes of the various dynamic sections. Allocate 1067 memory for them. */ 1068 relocs = FALSE; 1069 for (s = dynobj->sections; s != NULL; s = s->next) 1070 { 1071 const char *name; 1072 1073 if ((s->flags & SEC_LINKER_CREATED) == 0) 1074 continue; 1075 1076 /* It's OK to base decisions on the section name, because none 1077 of the dynobj section names depend upon the input files. */ 1078 name = bfd_section_name (s); 1079 1080 if (strcmp (name, ".plt") == 0) 1081 { 1082 /* Remember whether there is a PLT. */ 1083 ; 1084 } 1085 else if (CONST_STRNEQ (name, ".rela")) 1086 { 1087 if (s->size != 0) 1088 { 1089 if (strcmp (name, ".rela.plt") != 0) 1090 relocs = TRUE; 1091 1092 /* We use the reloc_count field as a counter if we need 1093 to copy relocs into the output file. */ 1094 s->reloc_count = 0; 1095 } 1096 } 1097 else if (! CONST_STRNEQ (name, ".got") 1098 && strcmp (name, ".dynbss") != 0) 1099 { 1100 /* It's not one of our sections, so don't allocate space. */ 1101 continue; 1102 } 1103 1104 if (s->size == 0) 1105 { 1106 /* If we don't need this section, strip it from the 1107 output file. This is mostly to handle .rela.bss and 1108 .rela.plt. We must create both sections in 1109 create_dynamic_sections, because they must be created 1110 before the linker maps input sections to output 1111 sections. The linker does that before 1112 adjust_dynamic_symbol is called, and it is that 1113 function which decides whether anything needs to go 1114 into these sections. */ 1115 s->flags |= SEC_EXCLUDE; 1116 continue; 1117 } 1118 1119 if ((s->flags & SEC_HAS_CONTENTS) == 0) 1120 continue; 1121 1122 /* Allocate memory for the section contents. */ 1123 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 1124 if (s->contents == NULL) 1125 return FALSE; 1126 } 1127 1128 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs); 1129 } 1130 1131 /* This function is called via elf_vax_link_hash_traverse if we are 1132 creating a shared object with -Bsymbolic. It discards the space 1133 allocated to copy PC relative relocs against symbols which are defined 1134 in regular objects. We allocated space for them in the check_relocs 1135 routine, but we won't fill them in in the relocate_section routine. */ 1136 1137 static bfd_boolean 1138 elf_vax_discard_copies (struct elf_vax_link_hash_entry *h, 1139 void * ignore ATTRIBUTE_UNUSED) 1140 { 1141 struct elf_vax_pcrel_relocs_copied *s; 1142 1143 /* We only discard relocs for symbols defined in a regular object. */ 1144 if (!h->root.def_regular) 1145 return TRUE; 1146 1147 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) 1148 s->section->size -= s->count * sizeof (Elf32_External_Rela); 1149 1150 return TRUE; 1151 } 1152 1153 /* This function is called via elf_link_hash_traverse. It looks for 1154 entries that have GOT or PLT (.GOT) references. If creating a shared 1155 object with -Bsymbolic, or the symbol has been forced local, then it 1156 resets the reference count back to -1 so normal PC32 relocation will 1157 be done. Otherwise space in the .got and .rela.got will be reserved 1158 for the symbol. */ 1159 1160 static bfd_boolean 1161 elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, void * infoptr) 1162 { 1163 struct bfd_link_info *info = (struct bfd_link_info *) infoptr; 1164 bfd *dynobj; 1165 asection *sgot; 1166 asection *srelgot; 1167 1168 /* We don't care about non-GOT (and non-PLT) entries. */ 1169 if (h->got.refcount <= 0 && h->plt.refcount <= 0) 1170 return TRUE; 1171 1172 dynobj = elf_hash_table (info)->dynobj; 1173 BFD_ASSERT (dynobj != NULL); 1174 1175 sgot = elf_hash_table (info)->sgot; 1176 srelgot = elf_hash_table (info)->srelgot; 1177 1178 if (SYMBOL_REFERENCES_LOCAL (info, h)) 1179 { 1180 h->got.refcount = -1; 1181 h->plt.refcount = -1; 1182 } 1183 else if (h->got.refcount > 0) 1184 { 1185 /* Make sure this symbol is output as a dynamic symbol. */ 1186 if (h->dynindx == -1) 1187 { 1188 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 1189 return FALSE; 1190 } 1191 1192 /* Allocate space in the .got and .rela.got sections. */ 1193 sgot->size += 4; 1194 srelgot->size += sizeof (Elf32_External_Rela); 1195 } 1196 1197 return TRUE; 1198 } 1199 1200 /* Relocate an VAX ELF section. */ 1201 1202 static bfd_boolean 1203 elf_vax_relocate_section (bfd *output_bfd, 1204 struct bfd_link_info *info, 1205 bfd *input_bfd, 1206 asection *input_section, 1207 bfd_byte *contents, 1208 Elf_Internal_Rela *relocs, 1209 Elf_Internal_Sym *local_syms, 1210 asection **local_sections) 1211 { 1212 Elf_Internal_Shdr *symtab_hdr; 1213 struct elf_link_hash_entry **sym_hashes; 1214 bfd_vma plt_index; 1215 bfd_vma got_offset; 1216 asection *sgot; 1217 asection *splt; 1218 asection *sgotplt; 1219 asection *sreloc; 1220 Elf_Internal_Rela *rel; 1221 Elf_Internal_Rela *relend; 1222 1223 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1224 sym_hashes = elf_sym_hashes (input_bfd); 1225 1226 sgot = NULL; 1227 splt = NULL; 1228 sgotplt = NULL; 1229 sreloc = NULL; 1230 1231 rel = relocs; 1232 relend = relocs + input_section->reloc_count; 1233 for (; rel < relend; rel++) 1234 { 1235 int r_type; 1236 reloc_howto_type *howto; 1237 unsigned long r_symndx; 1238 struct elf_link_hash_entry *h; 1239 Elf_Internal_Sym *sym; 1240 asection *sec; 1241 bfd_vma relocation; 1242 bfd_reloc_status_type r; 1243 1244 r_type = ELF32_R_TYPE (rel->r_info); 1245 if (r_type < 0 || r_type >= (int) R_VAX_max) 1246 { 1247 bfd_set_error (bfd_error_bad_value); 1248 return FALSE; 1249 } 1250 howto = howto_table + r_type; 1251 1252 r_symndx = ELF32_R_SYM (rel->r_info); 1253 h = NULL; 1254 sym = NULL; 1255 sec = NULL; 1256 if (r_symndx < symtab_hdr->sh_info) 1257 { 1258 sym = local_syms + r_symndx; 1259 sec = local_sections[r_symndx]; 1260 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1261 } 1262 else 1263 { 1264 bfd_boolean unresolved_reloc; 1265 bfd_boolean warned, ignored; 1266 1267 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1268 r_symndx, symtab_hdr, sym_hashes, 1269 h, sec, relocation, 1270 unresolved_reloc, warned, ignored); 1271 1272 if ((h->root.type == bfd_link_hash_defined 1273 || h->root.type == bfd_link_hash_defweak) 1274 && ((r_type == R_VAX_PLT32 1275 && h->plt.offset != (bfd_vma) -1 1276 && !h->forced_local 1277 && elf_hash_table (info)->dynamic_sections_created) 1278 || (r_type == R_VAX_GOT32 1279 && h->got.offset != (bfd_vma) -1 1280 && !h->forced_local 1281 && elf_hash_table (info)->dynamic_sections_created 1282 && (! bfd_link_pic (info) 1283 || (! info->symbolic && h->dynindx != -1) 1284 || !h->def_regular)) 1285 || (bfd_link_pic (info) 1286 && ((! info->symbolic && h->dynindx != -1) 1287 || !h->def_regular) 1288 && ((input_section->flags & SEC_ALLOC) != 0 1289 /* DWARF will emit R_VAX_32 relocations in its 1290 sections against symbols defined externally 1291 in shared libraries. We can't do anything 1292 with them here. */ 1293 1294 || ((input_section->flags & SEC_DEBUGGING) != 0 1295 && h->def_dynamic)) 1296 && (r_type == R_VAX_8 1297 || r_type == R_VAX_16 1298 || r_type == R_VAX_32)))) 1299 /* In these cases, we don't need the relocation 1300 value. We check specially because in some 1301 obscure cases sec->output_section will be NULL. */ 1302 relocation = 0; 1303 } 1304 1305 if (sec != NULL && discarded_section (sec)) 1306 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1307 rel, 1, relend, howto, 0, contents); 1308 1309 if (bfd_link_relocatable (info)) 1310 continue; 1311 1312 switch (r_type) 1313 { 1314 case R_VAX_GOT32: 1315 /* Relocation is to the address of the entry for this symbol 1316 in the global offset table. */ 1317 1318 /* Resolve a GOTxx reloc against a local symbol directly, 1319 without using the global offset table. */ 1320 if (h == NULL 1321 || h->got.offset == (bfd_vma) -1) 1322 break; 1323 1324 { 1325 bfd_vma off; 1326 1327 sgot = elf_hash_table (info)->sgot; 1328 BFD_ASSERT (sgot != NULL); 1329 1330 off = h->got.offset; 1331 BFD_ASSERT (off < sgot->size); 1332 1333 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off); 1334 1335 relocation = sgot->output_offset + off; 1336 /* The GOT relocation uses the addend. */ 1337 rel->r_addend = 0; 1338 1339 /* Change the reference to be indirect. */ 1340 contents[rel->r_offset - 1] |= 0x10; 1341 relocation += sgot->output_section->vma; 1342 } 1343 break; 1344 1345 case R_VAX_PC32: 1346 /* If we are creating an executable and the function this 1347 reloc refers to is in a shared lib, then we made a PLT 1348 entry for this symbol and need to handle the reloc like 1349 a PLT reloc. */ 1350 if (bfd_link_pic (info)) 1351 goto r_vax_pc32_shared; 1352 /* Fall through. */ 1353 case R_VAX_PLT32: 1354 /* Relocation is to the entry for this symbol in the 1355 procedure linkage table. */ 1356 1357 /* Resolve a PLTxx reloc against a local symbol directly, 1358 without using the procedure linkage table. */ 1359 if (h == NULL 1360 || h->plt.offset == (bfd_vma) -1) 1361 break; 1362 1363 splt = elf_hash_table (info)->splt; 1364 BFD_ASSERT (splt != NULL); 1365 1366 sgotplt = elf_hash_table (info)->sgotplt; 1367 BFD_ASSERT (sgotplt != NULL); 1368 1369 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1370 1371 /* Get the offset into the .got table of the entry that 1372 corresponds to this function. Each .got entry is 4 bytes. 1373 The first two are reserved. */ 1374 got_offset = (plt_index + 3) * 4; 1375 1376 /* We want the relocation to point into the .got.plt instead 1377 of the plt itself. */ 1378 relocation = (sgotplt->output_section->vma 1379 + sgotplt->output_offset 1380 + got_offset); 1381 contents[rel->r_offset-1] |= 0x10; /* make indirect */ 1382 if (rel->r_addend == 2) 1383 { 1384 h->plt.offset |= 1; 1385 } 1386 else if (rel->r_addend != 0) 1387 _bfd_error_handler 1388 /* xgettext:c-format */ 1389 (_("%pB: warning: PLT addend of %" PRId64 " to `%s'" 1390 " from %pA section ignored"), 1391 input_bfd, (int64_t) rel->r_addend, h->root.root.string, 1392 input_section); 1393 rel->r_addend = 0; 1394 1395 break; 1396 1397 case R_VAX_PC8: 1398 case R_VAX_PC16: 1399 r_vax_pc32_shared: 1400 if (h == NULL 1401 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1402 || h->forced_local) 1403 break; 1404 /* Fall through. */ 1405 case R_VAX_8: 1406 case R_VAX_16: 1407 case R_VAX_32: 1408 if (bfd_link_pic (info) 1409 && r_symndx != STN_UNDEF 1410 && (input_section->flags & SEC_ALLOC) != 0 1411 && ((r_type != R_VAX_PC8 1412 && r_type != R_VAX_PC16 1413 && r_type != R_VAX_PC32) 1414 || ((input_section->flags & SEC_CODE) 1415 && (!info->symbolic 1416 || (!h->def_regular && h->type != STT_SECTION))))) 1417 { 1418 Elf_Internal_Rela outrel; 1419 bfd_byte *loc; 1420 bfd_boolean skip, relocate; 1421 1422 /* When generating a shared object, these relocations 1423 are copied into the output file to be resolved at run 1424 time. */ 1425 if (sreloc == NULL) 1426 { 1427 sreloc = _bfd_elf_get_dynamic_reloc_section 1428 (input_bfd, input_section, /*rela?*/ TRUE); 1429 if (sreloc == NULL) 1430 return FALSE; 1431 } 1432 1433 skip = FALSE; 1434 relocate = FALSE; 1435 1436 outrel.r_offset = 1437 _bfd_elf_section_offset (output_bfd, info, input_section, 1438 rel->r_offset); 1439 if (outrel.r_offset == (bfd_vma) -1) 1440 skip = TRUE; 1441 if (outrel.r_offset == (bfd_vma) -2) 1442 skip = TRUE, relocate = TRUE; 1443 outrel.r_offset += (input_section->output_section->vma 1444 + input_section->output_offset); 1445 1446 if (skip) 1447 memset (&outrel, 0, sizeof outrel); 1448 /* h->dynindx may be -1 if the symbol was marked to 1449 become local. */ 1450 else if (h != NULL 1451 && ((! info->symbolic && h->dynindx != -1) 1452 || !h->def_regular)) 1453 { 1454 BFD_ASSERT (h->dynindx != -1); 1455 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1456 outrel.r_addend = relocation + rel->r_addend; 1457 } 1458 else 1459 { 1460 if (r_type == R_VAX_32) 1461 { 1462 relocate = TRUE; 1463 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE); 1464 BFD_ASSERT (bfd_get_signed_32 (input_bfd, 1465 &contents[rel->r_offset]) == 0); 1466 outrel.r_addend = relocation + rel->r_addend; 1467 } 1468 else 1469 { 1470 long indx; 1471 1472 if (bfd_is_abs_section (sec)) 1473 indx = 0; 1474 else if (sec == NULL || sec->owner == NULL) 1475 { 1476 bfd_set_error (bfd_error_bad_value); 1477 return FALSE; 1478 } 1479 else 1480 { 1481 asection *osec; 1482 1483 /* We are turning this relocation into one 1484 against a section symbol. It would be 1485 proper to subtract the symbol's value, 1486 osec->vma, from the emitted reloc addend, 1487 but ld.so expects buggy relocs. */ 1488 osec = sec->output_section; 1489 indx = elf_section_data (osec)->dynindx; 1490 if (indx == 0) 1491 { 1492 struct elf_link_hash_table *htab; 1493 htab = elf_hash_table (info); 1494 osec = htab->text_index_section; 1495 indx = elf_section_data (osec)->dynindx; 1496 } 1497 BFD_ASSERT (indx != 0); 1498 } 1499 1500 outrel.r_info = ELF32_R_INFO (indx, r_type); 1501 outrel.r_addend = relocation + rel->r_addend; 1502 } 1503 } 1504 1505 if ((input_section->flags & SEC_CODE) != 0 1506 || (ELF32_R_TYPE (outrel.r_info) != R_VAX_32 1507 && ELF32_R_TYPE (outrel.r_info) != R_VAX_RELATIVE 1508 && ELF32_R_TYPE (outrel.r_info) != R_VAX_COPY 1509 && ELF32_R_TYPE (outrel.r_info) != R_VAX_JMP_SLOT 1510 && ELF32_R_TYPE (outrel.r_info) != R_VAX_GLOB_DAT)) 1511 { 1512 if (h != NULL) 1513 _bfd_error_handler 1514 /* xgettext:c-format */ 1515 (_("%pB: warning: %s relocation against symbol `%s'" 1516 " from %pA section"), 1517 input_bfd, howto->name, h->root.root.string, 1518 input_section); 1519 else 1520 _bfd_error_handler 1521 /* xgettext:c-format */ 1522 (_("%pB: warning: %s relocation to %#" PRIx64 1523 " from %pA section"), 1524 input_bfd, howto->name, (uint64_t) outrel.r_addend, 1525 input_section); 1526 } 1527 loc = sreloc->contents; 1528 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1529 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1530 1531 /* This reloc will be computed at runtime, so there's no 1532 need to do anything now, except for R_VAX_32 1533 relocations that have been turned into 1534 R_VAX_RELATIVE. */ 1535 if (!relocate) 1536 continue; 1537 } 1538 1539 break; 1540 1541 case R_VAX_GNU_VTINHERIT: 1542 case R_VAX_GNU_VTENTRY: 1543 /* These are no-ops in the end. */ 1544 continue; 1545 1546 default: 1547 break; 1548 } 1549 1550 /* VAX PCREL relocations are from the end of relocation, not the start. 1551 So subtract the difference from the relocation amount since we can't 1552 add it to the offset. */ 1553 if (howto->pc_relative && howto->pcrel_offset) 1554 relocation -= bfd_get_reloc_size(howto); 1555 1556 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1557 contents, rel->r_offset, 1558 relocation, rel->r_addend); 1559 1560 if (r != bfd_reloc_ok) 1561 { 1562 switch (r) 1563 { 1564 default: 1565 case bfd_reloc_outofrange: 1566 abort (); 1567 case bfd_reloc_overflow: 1568 { 1569 const char *name; 1570 1571 if (h != NULL) 1572 name = NULL; 1573 else 1574 { 1575 name = bfd_elf_string_from_elf_section (input_bfd, 1576 symtab_hdr->sh_link, 1577 sym->st_name); 1578 if (name == NULL) 1579 return FALSE; 1580 if (*name == '\0') 1581 name = bfd_section_name (sec); 1582 } 1583 info->callbacks->reloc_overflow 1584 (info, (h ? &h->root : NULL), name, howto->name, 1585 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1586 } 1587 break; 1588 } 1589 } 1590 } 1591 1592 return TRUE; 1593 } 1594 1595 /* Finish up dynamic symbol handling. We set the contents of various 1596 dynamic sections here. */ 1597 1598 static bfd_boolean 1599 elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info, 1600 struct elf_link_hash_entry *h, 1601 Elf_Internal_Sym *sym) 1602 { 1603 bfd *dynobj; 1604 1605 dynobj = elf_hash_table (info)->dynobj; 1606 1607 if (h->plt.offset != (bfd_vma) -1) 1608 { 1609 asection *splt; 1610 asection *sgot; 1611 asection *srela; 1612 bfd_vma plt_index; 1613 bfd_vma got_offset; 1614 bfd_vma addend; 1615 Elf_Internal_Rela rela; 1616 bfd_byte *loc; 1617 1618 /* This symbol has an entry in the procedure linkage table. Set 1619 it up. */ 1620 BFD_ASSERT (h->dynindx != -1); 1621 1622 splt = elf_hash_table (info)->splt; 1623 sgot = elf_hash_table (info)->sgotplt; 1624 srela = elf_hash_table (info)->srelplt; 1625 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 1626 1627 addend = 2 * (h->plt.offset & 1); 1628 h->plt.offset &= ~1; 1629 1630 /* Get the index in the procedure linkage table which 1631 corresponds to this symbol. This is the index of this symbol 1632 in all the symbols for which we are making plt entries. The 1633 first entry in the procedure linkage table is reserved. */ 1634 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1635 1636 /* Get the offset into the .got table of the entry that 1637 corresponds to this function. Each .got entry is 4 bytes. 1638 The first two are reserved. */ 1639 got_offset = (plt_index + 3) * 4; 1640 1641 /* Fill in the entry in the procedure linkage table. */ 1642 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry, 1643 PLT_ENTRY_SIZE); 1644 1645 /* The offset is relative to the first extension word. */ 1646 bfd_put_32 (output_bfd, 1647 -(h->plt.offset + 8), 1648 splt->contents + h->plt.offset + 4); 1649 1650 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 1651 splt->contents + h->plt.offset + 8); 1652 1653 /* Fill in the entry in the global offset table. */ 1654 bfd_put_32 (output_bfd, 1655 (splt->output_section->vma 1656 + splt->output_offset 1657 + h->plt.offset) + addend, 1658 sgot->contents + got_offset); 1659 1660 /* Fill in the entry in the .rela.plt section. */ 1661 rela.r_offset = (sgot->output_section->vma 1662 + sgot->output_offset 1663 + got_offset); 1664 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT); 1665 rela.r_addend = addend; 1666 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 1667 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1668 1669 if (!h->def_regular) 1670 { 1671 /* Mark the symbol as undefined, rather than as defined in 1672 the .plt section. Leave the value alone. */ 1673 sym->st_shndx = SHN_UNDEF; 1674 } 1675 } 1676 1677 if (h->got.offset != (bfd_vma) -1) 1678 { 1679 asection *sgot; 1680 asection *srela; 1681 Elf_Internal_Rela rela; 1682 bfd_byte *loc; 1683 1684 /* This symbol has an entry in the global offset table. Set it 1685 up. */ 1686 sgot = elf_hash_table (info)->sgot; 1687 srela = elf_hash_table (info)->srelgot; 1688 BFD_ASSERT (sgot != NULL && srela != NULL); 1689 1690 rela.r_offset = (sgot->output_section->vma 1691 + sgot->output_offset 1692 + h->got.offset); 1693 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT); 1694 rela.r_addend = bfd_get_signed_32 (output_bfd, 1695 sgot->contents + h->got.offset); 1696 1697 loc = srela->contents; 1698 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 1699 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1700 } 1701 1702 if (h->needs_copy) 1703 { 1704 asection *s; 1705 Elf_Internal_Rela rela; 1706 bfd_byte *loc; 1707 1708 /* This symbol needs a copy reloc. Set it up. */ 1709 BFD_ASSERT (h->dynindx != -1 1710 && (h->root.type == bfd_link_hash_defined 1711 || h->root.type == bfd_link_hash_defweak)); 1712 1713 s = bfd_get_linker_section (dynobj, ".rela.bss"); 1714 BFD_ASSERT (s != NULL); 1715 1716 rela.r_offset = (h->root.u.def.value 1717 + h->root.u.def.section->output_section->vma 1718 + h->root.u.def.section->output_offset); 1719 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY); 1720 rela.r_addend = 0; 1721 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 1722 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1723 } 1724 1725 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 1726 if (h == elf_hash_table (info)->hdynamic 1727 || h == elf_hash_table (info)->hgot) 1728 sym->st_shndx = SHN_ABS; 1729 1730 return TRUE; 1731 } 1732 1733 /* Finish up the dynamic sections. */ 1734 1735 static bfd_boolean 1736 elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 1737 { 1738 bfd *dynobj; 1739 asection *sgot; 1740 asection *sdyn; 1741 1742 dynobj = elf_hash_table (info)->dynobj; 1743 1744 sgot = elf_hash_table (info)->sgotplt; 1745 BFD_ASSERT (sgot != NULL); 1746 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 1747 1748 if (elf_hash_table (info)->dynamic_sections_created) 1749 { 1750 asection *splt; 1751 Elf32_External_Dyn *dyncon, *dynconend; 1752 1753 splt = elf_hash_table (info)->splt; 1754 BFD_ASSERT (splt != NULL && sdyn != NULL); 1755 1756 dyncon = (Elf32_External_Dyn *) sdyn->contents; 1757 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 1758 for (; dyncon < dynconend; dyncon++) 1759 { 1760 Elf_Internal_Dyn dyn; 1761 asection *s; 1762 1763 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 1764 1765 switch (dyn.d_tag) 1766 { 1767 default: 1768 break; 1769 1770 case DT_PLTGOT: 1771 s = elf_hash_table (info)->sgotplt; 1772 goto get_vma; 1773 case DT_JMPREL: 1774 s = elf_hash_table (info)->srelplt; 1775 get_vma: 1776 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 1777 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1778 break; 1779 1780 case DT_PLTRELSZ: 1781 s = elf_hash_table (info)->srelplt; 1782 dyn.d_un.d_val = s->size; 1783 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1784 break; 1785 } 1786 } 1787 1788 /* Fill in the first entry in the procedure linkage table. */ 1789 if (splt->size > 0) 1790 { 1791 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE); 1792 bfd_put_32 (output_bfd, 1793 (sgot->output_section->vma 1794 + sgot->output_offset + 4 1795 - (splt->output_section->vma + 6)), 1796 splt->contents + 2); 1797 bfd_put_32 (output_bfd, 1798 (sgot->output_section->vma 1799 + sgot->output_offset + 8 1800 - (splt->output_section->vma + 12)), 1801 splt->contents + 8); 1802 elf_section_data (splt->output_section)->this_hdr.sh_entsize 1803 = PLT_ENTRY_SIZE; 1804 } 1805 } 1806 1807 /* Fill in the first three entries in the global offset table. */ 1808 if (sgot->size > 0) 1809 { 1810 if (sdyn == NULL) 1811 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 1812 else 1813 bfd_put_32 (output_bfd, 1814 sdyn->output_section->vma + sdyn->output_offset, 1815 sgot->contents); 1816 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 1817 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 1818 } 1819 1820 if (elf_section_data (sgot->output_section) != NULL) 1821 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 1822 1823 return TRUE; 1824 } 1825 1826 static enum elf_reloc_type_class 1827 elf_vax_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 1828 const asection *rel_sec ATTRIBUTE_UNUSED, 1829 const Elf_Internal_Rela *rela) 1830 { 1831 switch ((int) ELF32_R_TYPE (rela->r_info)) 1832 { 1833 case R_VAX_RELATIVE: 1834 return reloc_class_relative; 1835 case R_VAX_JMP_SLOT: 1836 return reloc_class_plt; 1837 case R_VAX_COPY: 1838 return reloc_class_copy; 1839 default: 1840 return reloc_class_normal; 1841 } 1842 } 1843 1844 static bfd_vma 1845 elf_vax_plt_sym_val (bfd_vma i, const asection *plt, 1846 const arelent *rel ATTRIBUTE_UNUSED) 1847 { 1848 return plt->vma + (i + 1) * PLT_ENTRY_SIZE; 1849 } 1850 1851 #define TARGET_LITTLE_SYM vax_elf32_vec 1852 #define TARGET_LITTLE_NAME "elf32-vax" 1853 #define ELF_MACHINE_CODE EM_VAX 1854 #define ELF_MAXPAGESIZE 0x1000 1855 1856 #define elf_backend_create_dynamic_sections \ 1857 _bfd_elf_create_dynamic_sections 1858 #define bfd_elf32_bfd_link_hash_table_create \ 1859 elf_vax_link_hash_table_create 1860 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link 1861 1862 #define elf_backend_check_relocs elf_vax_check_relocs 1863 #define elf_backend_adjust_dynamic_symbol \ 1864 elf_vax_adjust_dynamic_symbol 1865 #define elf_backend_always_size_sections \ 1866 elf_vax_always_size_sections 1867 #define elf_backend_size_dynamic_sections \ 1868 elf_vax_size_dynamic_sections 1869 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 1870 #define elf_backend_relocate_section elf_vax_relocate_section 1871 #define elf_backend_finish_dynamic_symbol \ 1872 elf_vax_finish_dynamic_symbol 1873 #define elf_backend_finish_dynamic_sections \ 1874 elf_vax_finish_dynamic_sections 1875 #define elf_backend_reloc_type_class elf_vax_reloc_type_class 1876 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook 1877 #define elf_backend_plt_sym_val elf_vax_plt_sym_val 1878 #define bfd_elf32_bfd_merge_private_bfd_data \ 1879 elf32_vax_merge_private_bfd_data 1880 #define bfd_elf32_bfd_set_private_flags \ 1881 elf32_vax_set_private_flags 1882 #define bfd_elf32_bfd_print_private_bfd_data \ 1883 elf32_vax_print_private_bfd_data 1884 1885 #define elf_backend_can_gc_sections 1 1886 #define elf_backend_want_got_plt 1 1887 #define elf_backend_plt_readonly 1 1888 #define elf_backend_want_plt_sym 0 1889 #define elf_backend_got_header_size 16 1890 #define elf_backend_rela_normal 1 1891 #define elf_backend_dtrel_excludes_plt 1 1892 1893 #include "elf32-target.h" 1894