elf32-vax.c revision 1.1.1.9
1 /* VAX series support for 32-bit ELF 2 Copyright (C) 1993-2020 Free Software Foundation, Inc. 3 Contributed by Matt Thomas <matt (at) 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. */ 357 358 /* The name of the dynamic interpreter. This is put in the .interp 359 section. */ 360 361 #define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so" 362 363 /* The size in bytes of an entry in the procedure linkage table. */ 364 365 #define PLT_ENTRY_SIZE 12 366 367 /* The first entry in a procedure linkage table looks like this. See 368 the SVR4 ABI VAX supplement to see how this works. */ 369 370 static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] = 371 { 372 0xdd, 0xef, /* pushl l^ */ 373 0, 0, 0, 0, /* offset to .plt.got + 4 */ 374 0x17, 0xff, /* jmp @L^(pc) */ 375 0, 0, 0, 0, /* offset to .plt.got + 8 */ 376 }; 377 378 /* Subsequent entries in a procedure linkage table look like this. */ 379 380 static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] = 381 { 382 0xfc, 0x0f, /* .word ^M<r11:r2> */ 383 0x16, 0xef, /* jsb L^(pc) */ 384 0, 0, 0, 0, /* replaced with offset to start of .plt */ 385 0, 0, 0, 0, /* index into .rela.plt */ 386 }; 387 388 /* The VAX linker needs to keep track of the number of relocs that it 389 decides to copy in check_relocs for each symbol. This is so that it 390 can discard PC relative relocs if it doesn't need them when linking 391 with -Bsymbolic. We store the information in a field extending the 392 regular ELF linker hash table. */ 393 394 /* This structure keeps track of the number of PC relative relocs we have 395 copied for a given symbol. */ 396 397 struct elf_vax_pcrel_relocs_copied 398 { 399 /* Next section. */ 400 struct elf_vax_pcrel_relocs_copied *next; 401 /* A section in dynobj. */ 402 asection *section; 403 /* Number of relocs copied in this section. */ 404 bfd_size_type count; 405 }; 406 407 /* VAX ELF linker hash entry. */ 408 409 struct elf_vax_link_hash_entry 410 { 411 struct elf_link_hash_entry root; 412 413 /* Number of PC relative relocs copied for this symbol. */ 414 struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied; 415 416 bfd_vma got_addend; 417 }; 418 419 /* Declare this now that the above structures are defined. */ 420 421 static bfd_boolean elf_vax_discard_copies (struct elf_vax_link_hash_entry *, 422 void *); 423 424 /* Declare this now that the above structures are defined. */ 425 426 static bfd_boolean elf_vax_instantiate_got_entries (struct elf_link_hash_entry *, 427 void *); 428 429 /* Traverse an VAX ELF linker hash table. */ 430 431 #define elf_vax_link_hash_traverse(table, func, info) \ 432 (elf_link_hash_traverse \ 433 ((table), \ 434 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \ 435 (info))) 436 437 /* Create an entry in an VAX ELF linker hash table. */ 438 439 static struct bfd_hash_entry * 440 elf_vax_link_hash_newfunc (struct bfd_hash_entry *entry, 441 struct bfd_hash_table *table, 442 const char *string) 443 { 444 struct elf_vax_link_hash_entry *ret = 445 (struct elf_vax_link_hash_entry *) entry; 446 447 /* Allocate the structure if it has not already been allocated by a 448 subclass. */ 449 if (ret == NULL) 450 ret = ((struct elf_vax_link_hash_entry *) 451 bfd_hash_allocate (table, 452 sizeof (struct elf_vax_link_hash_entry))); 453 if (ret == NULL) 454 return (struct bfd_hash_entry *) ret; 455 456 /* Call the allocation method of the superclass. */ 457 ret = ((struct elf_vax_link_hash_entry *) 458 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 459 table, string)); 460 if (ret != NULL) 461 { 462 ret->pcrel_relocs_copied = NULL; 463 } 464 465 return (struct bfd_hash_entry *) ret; 466 } 467 468 /* Create an VAX ELF linker hash table. */ 469 470 static struct bfd_link_hash_table * 471 elf_vax_link_hash_table_create (bfd *abfd) 472 { 473 struct elf_link_hash_table *ret; 474 size_t amt = sizeof (struct elf_link_hash_table); 475 476 ret = bfd_zmalloc (amt); 477 if (ret == NULL) 478 return NULL; 479 480 if (!_bfd_elf_link_hash_table_init (ret, abfd, 481 elf_vax_link_hash_newfunc, 482 sizeof (struct elf_vax_link_hash_entry), 483 GENERIC_ELF_DATA)) 484 { 485 free (ret); 486 return NULL; 487 } 488 489 return &ret->root; 490 } 491 492 /* Keep vax-specific flags in the ELF header */ 493 static bfd_boolean 494 elf32_vax_set_private_flags (bfd *abfd, flagword flags) 495 { 496 elf_elfheader (abfd)->e_flags = flags; 497 elf_flags_init (abfd) = TRUE; 498 return TRUE; 499 } 500 501 /* Merge backend specific data from an object file to the output 502 object file when linking. */ 503 static bfd_boolean 504 elf32_vax_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info) 505 { 506 bfd *obfd = info->output_bfd; 507 flagword in_flags; 508 509 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 510 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 511 return TRUE; 512 513 in_flags = elf_elfheader (ibfd)->e_flags; 514 515 if (!elf_flags_init (obfd)) 516 { 517 elf_flags_init (obfd) = TRUE; 518 elf_elfheader (obfd)->e_flags = in_flags; 519 } 520 521 return TRUE; 522 } 523 524 /* Display the flags field */ 525 static bfd_boolean 526 elf32_vax_print_private_bfd_data (bfd *abfd, void * ptr) 527 { 528 FILE *file = (FILE *) ptr; 529 530 BFD_ASSERT (abfd != NULL && ptr != NULL); 531 532 /* Print normal ELF private data. */ 533 _bfd_elf_print_private_bfd_data (abfd, ptr); 534 535 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ 536 537 /* xgettext:c-format */ 538 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 539 540 if (elf_elfheader (abfd)->e_flags & EF_VAX_NONPIC) 541 fprintf (file, _(" [nonpic]")); 542 543 if (elf_elfheader (abfd)->e_flags & EF_VAX_DFLOAT) 544 fprintf (file, _(" [d-float]")); 545 546 if (elf_elfheader (abfd)->e_flags & EF_VAX_GFLOAT) 547 fprintf (file, _(" [g-float]")); 548 549 fputc ('\n', file); 550 551 return TRUE; 552 } 553 /* Look through the relocs for a section during the first phase, and 554 allocate space in the global offset table or procedure linkage 555 table. */ 556 557 static bfd_boolean 558 elf_vax_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, 559 const Elf_Internal_Rela *relocs) 560 { 561 bfd *dynobj; 562 Elf_Internal_Shdr *symtab_hdr; 563 struct elf_link_hash_entry **sym_hashes; 564 const Elf_Internal_Rela *rel; 565 const Elf_Internal_Rela *rel_end; 566 asection *sreloc; 567 568 if (bfd_link_relocatable (info)) 569 return TRUE; 570 571 dynobj = elf_hash_table (info)->dynobj; 572 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 573 sym_hashes = elf_sym_hashes (abfd); 574 575 sreloc = NULL; 576 577 rel_end = relocs + sec->reloc_count; 578 for (rel = relocs; rel < rel_end; rel++) 579 { 580 unsigned long r_symndx; 581 struct elf_link_hash_entry *h; 582 583 r_symndx = ELF32_R_SYM (rel->r_info); 584 585 if (r_symndx < symtab_hdr->sh_info) 586 h = NULL; 587 else 588 { 589 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 590 while (h->root.type == bfd_link_hash_indirect 591 || h->root.type == bfd_link_hash_warning) 592 h = (struct elf_link_hash_entry *) h->root.u.i.link; 593 } 594 595 switch (ELF32_R_TYPE (rel->r_info)) 596 { 597 case R_VAX_GOT32: 598 BFD_ASSERT (h != NULL); 599 600 /* If this is a local symbol, we resolve it directly without 601 creating a global offset table entry. */ 602 if (h->forced_local 603 || h == elf_hash_table (info)->hgot 604 || h == elf_hash_table (info)->hplt) 605 break; 606 607 /* This symbol requires a global offset table entry. */ 608 609 if (dynobj == NULL) 610 { 611 /* Create the .got section. */ 612 elf_hash_table (info)->dynobj = dynobj = abfd; 613 if (!_bfd_elf_create_got_section (dynobj, info)) 614 return FALSE; 615 } 616 617 if (h != NULL) 618 { 619 struct elf_vax_link_hash_entry *eh; 620 621 eh = (struct elf_vax_link_hash_entry *) h; 622 if (h->got.refcount == -1) 623 { 624 h->got.refcount = 1; 625 eh->got_addend = rel->r_addend; 626 } 627 else 628 { 629 h->got.refcount++; 630 if (eh->got_addend != (bfd_vma) rel->r_addend) 631 _bfd_error_handler 632 /* xgettext:c-format */ 633 (_("%pB: warning: GOT addend of %" PRId64 " to `%s' does" 634 " not match previous GOT addend of %" PRId64), 635 abfd, (int64_t) rel->r_addend, h->root.root.string, 636 (int64_t) eh->got_addend); 637 638 } 639 } 640 break; 641 642 case R_VAX_PLT32: 643 /* This symbol requires a procedure linkage table entry. We 644 actually build the entry in adjust_dynamic_symbol, 645 because this might be a case of linking PIC code which is 646 never referenced by a dynamic object, in which case we 647 don't need to generate a procedure linkage table entry 648 after all. */ 649 BFD_ASSERT (h != NULL); 650 651 /* If this is a local symbol, we resolve it directly without 652 creating a procedure linkage table entry. */ 653 if (h->forced_local) 654 break; 655 656 h->needs_plt = 1; 657 if (h->plt.refcount == -1) 658 h->plt.refcount = 1; 659 else 660 h->plt.refcount++; 661 break; 662 663 case R_VAX_PC8: 664 case R_VAX_PC16: 665 case R_VAX_PC32: 666 /* If we are creating a shared library and this is not a local 667 symbol, we need to copy the reloc into the shared library. 668 However when linking with -Bsymbolic and this is a global 669 symbol which is defined in an object we are including in the 670 link (i.e., DEF_REGULAR is set), then we can resolve the 671 reloc directly. At this point we have not seen all the input 672 files, so it is possible that DEF_REGULAR is not set now but 673 will be set later (it is never cleared). We account for that 674 possibility below by storing information in the 675 pcrel_relocs_copied field of the hash table entry. */ 676 if (!(bfd_link_pic (info) 677 && (sec->flags & SEC_ALLOC) != 0 678 && h != NULL 679 && (!info->symbolic 680 || !h->def_regular))) 681 { 682 if (h != NULL 683 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 684 && !h->forced_local) 685 { 686 /* Make sure a plt entry is created for this symbol if 687 it turns out to be a function defined by a dynamic 688 object. */ 689 if (h->plt.refcount == -1) 690 h->plt.refcount = 1; 691 else 692 h->plt.refcount++; 693 } 694 break; 695 } 696 /* If this is a local symbol, we can resolve it directly. */ 697 if (h != NULL 698 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 699 || h->forced_local)) 700 break; 701 702 /* Fall through. */ 703 case R_VAX_8: 704 case R_VAX_16: 705 case R_VAX_32: 706 if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) 707 { 708 /* Make sure a plt entry is created for this symbol if it 709 turns out to be a function defined by a dynamic object. */ 710 if (h->plt.refcount == -1) 711 h->plt.refcount = 1; 712 else 713 h->plt.refcount++; 714 } 715 716 /* Non-GOT reference may need a copy reloc in executable or 717 a dynamic reloc in shared library. */ 718 if (h != NULL) 719 h->non_got_ref = 1; 720 721 /* If we are creating a shared library, we need to copy the 722 reloc into the shared library. */ 723 if (bfd_link_pic (info) 724 && (sec->flags & SEC_ALLOC) != 0) 725 { 726 /* When creating a shared object, we must copy these 727 reloc types into the output file. We create a reloc 728 section in dynobj and make room for this reloc. */ 729 if (sreloc == NULL) 730 { 731 sreloc = _bfd_elf_make_dynamic_reloc_section 732 (sec, dynobj, 2, abfd, /*rela?*/ TRUE); 733 734 if (sreloc == NULL) 735 return FALSE; 736 737 if (sec->flags & SEC_READONLY) 738 info->flags |= DF_TEXTREL; 739 } 740 741 sreloc->size += sizeof (Elf32_External_Rela); 742 743 /* If we are linking with -Bsymbolic, we count the number of 744 PC relative relocations we have entered for this symbol, 745 so that we can discard them again if the symbol is later 746 defined by a regular object. Note that this function is 747 only called if we are using a vaxelf linker hash table, 748 which means that h is really a pointer to an 749 elf_vax_link_hash_entry. */ 750 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8 751 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16 752 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32) 753 && info->symbolic) 754 { 755 struct elf_vax_link_hash_entry *eh; 756 struct elf_vax_pcrel_relocs_copied *p; 757 758 eh = (struct elf_vax_link_hash_entry *) h; 759 760 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) 761 if (p->section == sreloc) 762 break; 763 764 if (p == NULL) 765 { 766 p = ((struct elf_vax_pcrel_relocs_copied *) 767 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 768 if (p == NULL) 769 return FALSE; 770 p->next = eh->pcrel_relocs_copied; 771 eh->pcrel_relocs_copied = p; 772 p->section = sreloc; 773 p->count = 0; 774 } 775 776 ++p->count; 777 } 778 } 779 780 break; 781 782 /* This relocation describes the C++ object vtable hierarchy. 783 Reconstruct it for later use during GC. */ 784 case R_VAX_GNU_VTINHERIT: 785 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 786 return FALSE; 787 break; 788 789 /* This relocation describes which C++ vtable entries are actually 790 used. Record for later use during GC. */ 791 case R_VAX_GNU_VTENTRY: 792 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 793 return FALSE; 794 break; 795 796 default: 797 break; 798 } 799 } 800 801 return TRUE; 802 } 803 804 /* Return the section that should be marked against GC for a given 805 relocation. */ 806 807 static asection * 808 elf_vax_gc_mark_hook (asection *sec, 809 struct bfd_link_info *info, 810 Elf_Internal_Rela *rel, 811 struct elf_link_hash_entry *h, 812 Elf_Internal_Sym *sym) 813 { 814 if (h != NULL) 815 switch (ELF32_R_TYPE (rel->r_info)) 816 { 817 case R_VAX_GNU_VTINHERIT: 818 case R_VAX_GNU_VTENTRY: 819 return NULL; 820 } 821 822 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 823 } 824 825 /* Adjust a symbol defined by a dynamic object and referenced by a 826 regular object. The current definition is in some section of the 827 dynamic object, but we're not including those sections. We have to 828 change the definition to something the rest of the link can 829 understand. */ 830 831 static bfd_boolean 832 elf_vax_adjust_dynamic_symbol (struct bfd_link_info *info, 833 struct elf_link_hash_entry *h) 834 { 835 bfd *dynobj; 836 asection *s; 837 838 dynobj = elf_hash_table (info)->dynobj; 839 840 /* Make sure we know what is going on here. */ 841 BFD_ASSERT (dynobj != NULL 842 && (h->needs_plt 843 || h->is_weakalias 844 || (h->def_dynamic 845 && h->ref_regular 846 && !h->def_regular))); 847 848 /* If this is a function, put it in the procedure linkage table. We 849 will fill in the contents of the procedure linkage table later, 850 when we know the address of the .got section. */ 851 if (h->type == STT_FUNC 852 || h->needs_plt) 853 { 854 if (h->plt.refcount <= 0 855 || SYMBOL_CALLS_LOCAL (info, h) 856 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 857 && h->root.type == bfd_link_hash_undefweak)) 858 { 859 /* This case can occur if we saw a PLTxx reloc in an input 860 file, but the symbol was never referred to by a dynamic 861 object, or if all references were garbage collected. In 862 such a case, we don't actually need to build a procedure 863 linkage table, and we can just do a PCxx reloc instead. */ 864 h->plt.offset = (bfd_vma) -1; 865 h->needs_plt = 0; 866 return TRUE; 867 } 868 869 s = elf_hash_table (info)->splt; 870 BFD_ASSERT (s != NULL); 871 872 /* If this is the first .plt entry, make room for the special 873 first entry. */ 874 if (s->size == 0) 875 { 876 s->size += PLT_ENTRY_SIZE; 877 } 878 879 /* If this symbol is not defined in a regular file, and we are 880 not generating a shared library, then set the symbol to this 881 location in the .plt. This is required to make function 882 pointers compare as equal between the normal executable and 883 the shared library. */ 884 if (!bfd_link_pic (info) 885 && !h->def_regular) 886 { 887 h->root.u.def.section = s; 888 h->root.u.def.value = s->size; 889 } 890 891 h->plt.offset = s->size; 892 893 /* Make room for this entry. */ 894 s->size += PLT_ENTRY_SIZE; 895 896 /* We also need to make an entry in the .got.plt section, which 897 will be placed in the .got section by the linker script. */ 898 899 s = elf_hash_table (info)->sgotplt; 900 BFD_ASSERT (s != NULL); 901 s->size += 4; 902 903 /* We also need to make an entry in the .rela.plt section. */ 904 905 s = elf_hash_table (info)->srelplt; 906 BFD_ASSERT (s != NULL); 907 s->size += sizeof (Elf32_External_Rela); 908 909 return TRUE; 910 } 911 912 /* Reinitialize the plt offset now that it is not used as a reference 913 count any more. */ 914 h->plt.offset = (bfd_vma) -1; 915 916 /* If this is a weak symbol, and there is a real definition, the 917 processor independent code will have arranged for us to see the 918 real definition first, and we can just use the same value. */ 919 if (h->is_weakalias) 920 { 921 struct elf_link_hash_entry *def = weakdef (h); 922 BFD_ASSERT (def->root.type == bfd_link_hash_defined); 923 h->root.u.def.section = def->root.u.def.section; 924 h->root.u.def.value = def->root.u.def.value; 925 return TRUE; 926 } 927 928 /* This is a reference to a symbol defined by a dynamic object which 929 is not a function. */ 930 931 /* If we are creating a shared library, we must presume that the 932 only references to the symbol are via the global offset table. 933 For such cases we need not do anything here; the relocations will 934 be handled correctly by relocate_section. */ 935 if (bfd_link_pic (info)) 936 return TRUE; 937 938 /* If there are no references to this symbol that do not use the 939 GOT relocation, we don't need to generate a copy reloc. */ 940 if (!h->non_got_ref) 941 return TRUE; 942 943 /* We must allocate the symbol in our .dynbss section, which will 944 become part of the .bss section of the executable. There will be 945 an entry for this symbol in the .dynsym section. The dynamic 946 object will contain position independent code, so all references 947 from the dynamic object to this symbol will go through the global 948 offset table. The dynamic linker will use the .dynsym entry to 949 determine the address it must put in the global offset table, so 950 both the dynamic object and the regular object will refer to the 951 same memory location for the variable. */ 952 953 s = bfd_get_linker_section (dynobj, ".dynbss"); 954 BFD_ASSERT (s != NULL); 955 956 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to 957 copy the initial value out of the dynamic object and into the 958 runtime process image. We need to remember the offset into the 959 .rela.bss section we are going to use. */ 960 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 961 { 962 asection *srel; 963 964 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 965 BFD_ASSERT (srel != NULL); 966 srel->size += sizeof (Elf32_External_Rela); 967 h->needs_copy = 1; 968 } 969 970 return _bfd_elf_adjust_dynamic_copy (info, h, s); 971 } 972 973 /* This function is called via elf_link_hash_traverse. It resets GOT 974 and PLT (.GOT) reference counts back to -1 so normal PC32 relocation 975 will be done. */ 976 977 static bfd_boolean 978 elf_vax_discard_got_entries (struct elf_link_hash_entry *h, 979 void *infoptr ATTRIBUTE_UNUSED) 980 { 981 h->got.refcount = -1; 982 h->plt.refcount = -1; 983 984 return TRUE; 985 } 986 987 /* Discard unused dynamic data if this is a static link. */ 988 989 static bfd_boolean 990 elf_vax_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 991 struct bfd_link_info *info) 992 { 993 bfd *dynobj; 994 asection *s; 995 996 dynobj = elf_hash_table (info)->dynobj; 997 998 if (dynobj && !elf_hash_table (info)->dynamic_sections_created) 999 { 1000 /* We may have created entries in the .rela.got and .got sections. 1001 However, if we are not creating the dynamic sections, we will 1002 not actually use these entries. Reset the size of .rela.got 1003 and .got, which will cause them to get stripped from the output 1004 file below. */ 1005 s = elf_hash_table (info)->srelgot; 1006 if (s != NULL) 1007 s->size = 0; 1008 s = elf_hash_table (info)->sgotplt; 1009 if (s != NULL) 1010 s->size = 0; 1011 s = elf_hash_table (info)->sgot; 1012 if (s != NULL) 1013 s->size = 0; 1014 } 1015 1016 /* If this is a static link, we need to discard all the got entries we've 1017 recorded. */ 1018 if (!dynobj || !elf_hash_table (info)->dynamic_sections_created) 1019 elf_link_hash_traverse (elf_hash_table (info), 1020 elf_vax_discard_got_entries, 1021 info); 1022 1023 return TRUE; 1024 } 1025 1026 /* Set the sizes of the dynamic sections. */ 1027 1028 static bfd_boolean 1029 elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 1030 { 1031 bfd *dynobj; 1032 asection *s; 1033 bfd_boolean relocs; 1034 1035 dynobj = elf_hash_table (info)->dynobj; 1036 BFD_ASSERT (dynobj != NULL); 1037 1038 if (elf_hash_table (info)->dynamic_sections_created) 1039 { 1040 /* Set the contents of the .interp section to the interpreter. */ 1041 if (bfd_link_executable (info) && !info->nointerp) 1042 { 1043 s = bfd_get_linker_section (dynobj, ".interp"); 1044 BFD_ASSERT (s != NULL); 1045 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1046 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1047 } 1048 } 1049 1050 /* If this is a -Bsymbolic shared link, then we need to discard all PC 1051 relative relocs against symbols defined in a regular object. We 1052 allocated space for them in the check_relocs routine, but we will not 1053 fill them in in the relocate_section routine. */ 1054 if (bfd_link_pic (info) && info->symbolic) 1055 elf_vax_link_hash_traverse (elf_hash_table (info), 1056 elf_vax_discard_copies, 1057 NULL); 1058 1059 /* If this is a -Bsymbolic shared link, we need to discard all the got 1060 entries we've recorded. Otherwise, we need to instantiate (allocate 1061 space for them). */ 1062 elf_link_hash_traverse (elf_hash_table (info), 1063 elf_vax_instantiate_got_entries, 1064 info); 1065 1066 /* The check_relocs and adjust_dynamic_symbol entry points have 1067 determined the sizes of the various dynamic sections. Allocate 1068 memory for them. */ 1069 relocs = FALSE; 1070 for (s = dynobj->sections; s != NULL; s = s->next) 1071 { 1072 const char *name; 1073 1074 if ((s->flags & SEC_LINKER_CREATED) == 0) 1075 continue; 1076 1077 /* It's OK to base decisions on the section name, because none 1078 of the dynobj section names depend upon the input files. */ 1079 name = bfd_section_name (s); 1080 1081 if (strcmp (name, ".plt") == 0) 1082 { 1083 /* Remember whether there is a PLT. */ 1084 ; 1085 } 1086 else if (CONST_STRNEQ (name, ".rela")) 1087 { 1088 if (s->size != 0) 1089 { 1090 if (strcmp (name, ".rela.plt") != 0) 1091 relocs = TRUE; 1092 1093 /* We use the reloc_count field as a counter if we need 1094 to copy relocs into the output file. */ 1095 s->reloc_count = 0; 1096 } 1097 } 1098 else if (! CONST_STRNEQ (name, ".got") 1099 && strcmp (name, ".dynbss") != 0) 1100 { 1101 /* It's not one of our sections, so don't allocate space. */ 1102 continue; 1103 } 1104 1105 if (s->size == 0) 1106 { 1107 /* If we don't need this section, strip it from the 1108 output file. This is mostly to handle .rela.bss and 1109 .rela.plt. We must create both sections in 1110 create_dynamic_sections, because they must be created 1111 before the linker maps input sections to output 1112 sections. The linker does that before 1113 adjust_dynamic_symbol is called, and it is that 1114 function which decides whether anything needs to go 1115 into these sections. */ 1116 s->flags |= SEC_EXCLUDE; 1117 continue; 1118 } 1119 1120 if ((s->flags & SEC_HAS_CONTENTS) == 0) 1121 continue; 1122 1123 /* Allocate memory for the section contents. */ 1124 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 1125 if (s->contents == NULL) 1126 return FALSE; 1127 } 1128 1129 return _bfd_elf_add_dynamic_tags (output_bfd, info, relocs); 1130 } 1131 1132 /* This function is called via elf_vax_link_hash_traverse if we are 1133 creating a shared object with -Bsymbolic. It discards the space 1134 allocated to copy PC relative relocs against symbols which are defined 1135 in regular objects. We allocated space for them in the check_relocs 1136 routine, but we won't fill them in in the relocate_section routine. */ 1137 1138 static bfd_boolean 1139 elf_vax_discard_copies (struct elf_vax_link_hash_entry *h, 1140 void * ignore ATTRIBUTE_UNUSED) 1141 { 1142 struct elf_vax_pcrel_relocs_copied *s; 1143 1144 /* We only discard relocs for symbols defined in a regular object. */ 1145 if (!h->root.def_regular) 1146 return TRUE; 1147 1148 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) 1149 s->section->size -= s->count * sizeof (Elf32_External_Rela); 1150 1151 return TRUE; 1152 } 1153 1154 /* This function is called via elf_link_hash_traverse. It looks for 1155 entries that have GOT or PLT (.GOT) references. If creating a shared 1156 object with -Bsymbolic, or the symbol has been forced local, then it 1157 resets the reference count back to -1 so normal PC32 relocation will 1158 be done. Otherwise space in the .got and .rela.got will be reserved 1159 for the symbol. */ 1160 1161 static bfd_boolean 1162 elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, void * infoptr) 1163 { 1164 struct bfd_link_info *info = (struct bfd_link_info *) infoptr; 1165 bfd *dynobj; 1166 asection *sgot; 1167 asection *srelgot; 1168 1169 /* We don't care about non-GOT (and non-PLT) entries. */ 1170 if (h->got.refcount <= 0 && h->plt.refcount <= 0) 1171 return TRUE; 1172 1173 dynobj = elf_hash_table (info)->dynobj; 1174 BFD_ASSERT (dynobj != NULL); 1175 1176 sgot = elf_hash_table (info)->sgot; 1177 srelgot = elf_hash_table (info)->srelgot; 1178 1179 if (SYMBOL_REFERENCES_LOCAL (info, h)) 1180 { 1181 h->got.refcount = -1; 1182 h->plt.refcount = -1; 1183 } 1184 else if (h->got.refcount > 0) 1185 { 1186 /* Make sure this symbol is output as a dynamic symbol. */ 1187 if (h->dynindx == -1) 1188 { 1189 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 1190 return FALSE; 1191 } 1192 1193 /* Allocate space in the .got and .rela.got sections. */ 1194 sgot->size += 4; 1195 srelgot->size += sizeof (Elf32_External_Rela); 1196 } 1197 1198 return TRUE; 1199 } 1200 1201 /* Relocate an VAX ELF section. */ 1202 1203 static bfd_boolean 1204 elf_vax_relocate_section (bfd *output_bfd, 1205 struct bfd_link_info *info, 1206 bfd *input_bfd, 1207 asection *input_section, 1208 bfd_byte *contents, 1209 Elf_Internal_Rela *relocs, 1210 Elf_Internal_Sym *local_syms, 1211 asection **local_sections) 1212 { 1213 Elf_Internal_Shdr *symtab_hdr; 1214 struct elf_link_hash_entry **sym_hashes; 1215 bfd_vma plt_index; 1216 bfd_vma got_offset; 1217 asection *sgot; 1218 asection *splt; 1219 asection *sgotplt; 1220 asection *sreloc; 1221 Elf_Internal_Rela *rel; 1222 Elf_Internal_Rela *relend; 1223 1224 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1225 sym_hashes = elf_sym_hashes (input_bfd); 1226 1227 sgot = NULL; 1228 splt = NULL; 1229 sgotplt = NULL; 1230 sreloc = NULL; 1231 1232 rel = relocs; 1233 relend = relocs + input_section->reloc_count; 1234 for (; rel < relend; rel++) 1235 { 1236 int r_type; 1237 reloc_howto_type *howto; 1238 unsigned long r_symndx; 1239 struct elf_link_hash_entry *h; 1240 Elf_Internal_Sym *sym; 1241 asection *sec; 1242 bfd_vma relocation; 1243 bfd_reloc_status_type r; 1244 1245 r_type = ELF32_R_TYPE (rel->r_info); 1246 if (r_type < 0 || r_type >= (int) R_VAX_max) 1247 { 1248 bfd_set_error (bfd_error_bad_value); 1249 return FALSE; 1250 } 1251 howto = howto_table + r_type; 1252 1253 r_symndx = ELF32_R_SYM (rel->r_info); 1254 h = NULL; 1255 sym = NULL; 1256 sec = NULL; 1257 if (r_symndx < symtab_hdr->sh_info) 1258 { 1259 sym = local_syms + r_symndx; 1260 sec = local_sections[r_symndx]; 1261 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1262 } 1263 else 1264 { 1265 bfd_boolean unresolved_reloc; 1266 bfd_boolean warned, ignored; 1267 1268 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1269 r_symndx, symtab_hdr, sym_hashes, 1270 h, sec, relocation, 1271 unresolved_reloc, warned, ignored); 1272 1273 if ((h->root.type == bfd_link_hash_defined 1274 || h->root.type == bfd_link_hash_defweak) 1275 && ((r_type == R_VAX_PLT32 1276 && h->plt.offset != (bfd_vma) -1 1277 && !h->forced_local 1278 && elf_hash_table (info)->dynamic_sections_created) 1279 || (r_type == R_VAX_GOT32 1280 && h->got.offset != (bfd_vma) -1 1281 && !h->forced_local 1282 && elf_hash_table (info)->dynamic_sections_created 1283 && (! bfd_link_pic (info) 1284 || (! info->symbolic && h->dynindx != -1) 1285 || !h->def_regular)) 1286 || (bfd_link_pic (info) 1287 && ((! info->symbolic && h->dynindx != -1) 1288 || !h->def_regular) 1289 && ((input_section->flags & SEC_ALLOC) != 0 1290 /* DWARF will emit R_VAX_32 relocations in its 1291 sections against symbols defined externally 1292 in shared libraries. We can't do anything 1293 with them here. */ 1294 1295 || ((input_section->flags & SEC_DEBUGGING) != 0 1296 && h->def_dynamic)) 1297 && (r_type == R_VAX_8 1298 || r_type == R_VAX_16 1299 || r_type == R_VAX_32)))) 1300 /* In these cases, we don't need the relocation 1301 value. We check specially because in some 1302 obscure cases sec->output_section will be NULL. */ 1303 relocation = 0; 1304 } 1305 1306 if (sec != NULL && discarded_section (sec)) 1307 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1308 rel, 1, relend, howto, 0, contents); 1309 1310 if (bfd_link_relocatable (info)) 1311 continue; 1312 1313 switch (r_type) 1314 { 1315 case R_VAX_GOT32: 1316 /* Relocation is to the address of the entry for this symbol 1317 in the global offset table. */ 1318 1319 /* Resolve a GOTxx reloc against a local symbol directly, 1320 without using the global offset table. */ 1321 if (h == NULL 1322 || h->got.offset == (bfd_vma) -1) 1323 break; 1324 1325 { 1326 bfd_vma off; 1327 1328 sgot = elf_hash_table (info)->sgot; 1329 BFD_ASSERT (sgot != NULL); 1330 1331 off = h->got.offset; 1332 BFD_ASSERT (off < sgot->size); 1333 1334 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off); 1335 1336 relocation = sgot->output_offset + off; 1337 /* The GOT relocation uses the addend. */ 1338 rel->r_addend = 0; 1339 1340 /* Change the reference to be indirect. */ 1341 contents[rel->r_offset - 1] |= 0x10; 1342 relocation += sgot->output_section->vma; 1343 } 1344 break; 1345 1346 case R_VAX_PC32: 1347 /* If we are creating an executable and the function this 1348 reloc refers to is in a shared lib, then we made a PLT 1349 entry for this symbol and need to handle the reloc like 1350 a PLT reloc. */ 1351 if (bfd_link_pic (info)) 1352 goto r_vax_pc32_shared; 1353 /* Fall through. */ 1354 case R_VAX_PLT32: 1355 /* Relocation is to the entry for this symbol in the 1356 procedure linkage table. */ 1357 1358 /* Resolve a PLTxx reloc against a local symbol directly, 1359 without using the procedure linkage table. */ 1360 if (h == NULL 1361 || h->plt.offset == (bfd_vma) -1) 1362 break; 1363 1364 splt = elf_hash_table (info)->splt; 1365 BFD_ASSERT (splt != NULL); 1366 1367 sgotplt = elf_hash_table (info)->sgotplt; 1368 BFD_ASSERT (sgotplt != NULL); 1369 1370 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1371 1372 /* Get the offset into the .got table of the entry that 1373 corresponds to this function. Each .got entry is 4 bytes. 1374 The first two are reserved. */ 1375 got_offset = (plt_index + 3) * 4; 1376 1377 /* We want the relocation to point into the .got.plt instead 1378 of the plt itself. */ 1379 relocation = (sgotplt->output_section->vma 1380 + sgotplt->output_offset 1381 + got_offset); 1382 contents[rel->r_offset-1] |= 0x10; /* make indirect */ 1383 if (rel->r_addend == 2) 1384 { 1385 h->plt.offset |= 1; 1386 } 1387 else if (rel->r_addend != 0) 1388 _bfd_error_handler 1389 /* xgettext:c-format */ 1390 (_("%pB: warning: PLT addend of %" PRId64 " to `%s'" 1391 " from %pA section ignored"), 1392 input_bfd, (int64_t) rel->r_addend, h->root.root.string, 1393 input_section); 1394 rel->r_addend = 0; 1395 1396 break; 1397 1398 case R_VAX_PC8: 1399 case R_VAX_PC16: 1400 r_vax_pc32_shared: 1401 if (h == NULL 1402 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1403 || h->forced_local) 1404 break; 1405 /* Fall through. */ 1406 case R_VAX_8: 1407 case R_VAX_16: 1408 case R_VAX_32: 1409 if (bfd_link_pic (info) 1410 && r_symndx != STN_UNDEF 1411 && (input_section->flags & SEC_ALLOC) != 0 1412 && ((r_type != R_VAX_PC8 1413 && r_type != R_VAX_PC16 1414 && r_type != R_VAX_PC32) 1415 || ((input_section->flags & SEC_CODE) 1416 && (!info->symbolic 1417 || (!h->def_regular && h->type != STT_SECTION))))) 1418 { 1419 Elf_Internal_Rela outrel; 1420 bfd_byte *loc; 1421 bfd_boolean skip, relocate; 1422 1423 /* When generating a shared object, these relocations 1424 are copied into the output file to be resolved at run 1425 time. */ 1426 if (sreloc == NULL) 1427 { 1428 sreloc = _bfd_elf_get_dynamic_reloc_section 1429 (input_bfd, input_section, /*rela?*/ TRUE); 1430 if (sreloc == NULL) 1431 return FALSE; 1432 } 1433 1434 skip = FALSE; 1435 relocate = FALSE; 1436 1437 outrel.r_offset = 1438 _bfd_elf_section_offset (output_bfd, info, input_section, 1439 rel->r_offset); 1440 if (outrel.r_offset == (bfd_vma) -1) 1441 skip = TRUE; 1442 if (outrel.r_offset == (bfd_vma) -2) 1443 skip = TRUE, relocate = TRUE; 1444 outrel.r_offset += (input_section->output_section->vma 1445 + input_section->output_offset); 1446 1447 if (skip) 1448 memset (&outrel, 0, sizeof outrel); 1449 /* h->dynindx may be -1 if the symbol was marked to 1450 become local. */ 1451 else if (h != NULL 1452 && ((! info->symbolic && h->dynindx != -1) 1453 || !h->def_regular)) 1454 { 1455 BFD_ASSERT (h->dynindx != -1); 1456 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1457 outrel.r_addend = relocation + rel->r_addend; 1458 } 1459 else 1460 { 1461 if (r_type == R_VAX_32) 1462 { 1463 relocate = TRUE; 1464 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE); 1465 BFD_ASSERT (bfd_get_signed_32 (input_bfd, 1466 &contents[rel->r_offset]) == 0); 1467 outrel.r_addend = relocation + rel->r_addend; 1468 } 1469 else 1470 { 1471 long indx; 1472 1473 if (bfd_is_abs_section (sec)) 1474 indx = 0; 1475 else if (sec == NULL || sec->owner == NULL) 1476 { 1477 bfd_set_error (bfd_error_bad_value); 1478 return FALSE; 1479 } 1480 else 1481 { 1482 asection *osec; 1483 1484 /* We are turning this relocation into one 1485 against a section symbol. It would be 1486 proper to subtract the symbol's value, 1487 osec->vma, from the emitted reloc addend, 1488 but ld.so expects buggy relocs. */ 1489 osec = sec->output_section; 1490 indx = elf_section_data (osec)->dynindx; 1491 if (indx == 0) 1492 { 1493 struct elf_link_hash_table *htab; 1494 htab = elf_hash_table (info); 1495 osec = htab->text_index_section; 1496 indx = elf_section_data (osec)->dynindx; 1497 } 1498 BFD_ASSERT (indx != 0); 1499 } 1500 1501 outrel.r_info = ELF32_R_INFO (indx, r_type); 1502 outrel.r_addend = relocation + rel->r_addend; 1503 } 1504 } 1505 1506 if ((input_section->flags & SEC_CODE) != 0 1507 || (ELF32_R_TYPE (outrel.r_info) != R_VAX_32 1508 && ELF32_R_TYPE (outrel.r_info) != R_VAX_RELATIVE 1509 && ELF32_R_TYPE (outrel.r_info) != R_VAX_COPY 1510 && ELF32_R_TYPE (outrel.r_info) != R_VAX_JMP_SLOT 1511 && ELF32_R_TYPE (outrel.r_info) != R_VAX_GLOB_DAT)) 1512 { 1513 if (h != NULL) 1514 _bfd_error_handler 1515 /* xgettext:c-format */ 1516 (_("%pB: warning: %s relocation against symbol `%s'" 1517 " from %pA section"), 1518 input_bfd, howto->name, h->root.root.string, 1519 input_section); 1520 else 1521 _bfd_error_handler 1522 /* xgettext:c-format */ 1523 (_("%pB: warning: %s relocation to %#" PRIx64 1524 " from %pA section"), 1525 input_bfd, howto->name, (uint64_t) outrel.r_addend, 1526 input_section); 1527 } 1528 loc = sreloc->contents; 1529 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1530 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1531 1532 /* This reloc will be computed at runtime, so there's no 1533 need to do anything now, except for R_VAX_32 1534 relocations that have been turned into 1535 R_VAX_RELATIVE. */ 1536 if (!relocate) 1537 continue; 1538 } 1539 1540 break; 1541 1542 case R_VAX_GNU_VTINHERIT: 1543 case R_VAX_GNU_VTENTRY: 1544 /* These are no-ops in the end. */ 1545 continue; 1546 1547 default: 1548 break; 1549 } 1550 1551 /* VAX PCREL relocations are from the end of relocation, not the start. 1552 So subtract the difference from the relocation amount since we can't 1553 add it to the offset. */ 1554 if (howto->pc_relative && howto->pcrel_offset) 1555 relocation -= bfd_get_reloc_size(howto); 1556 1557 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1558 contents, rel->r_offset, 1559 relocation, rel->r_addend); 1560 1561 if (r != bfd_reloc_ok) 1562 { 1563 switch (r) 1564 { 1565 default: 1566 case bfd_reloc_outofrange: 1567 abort (); 1568 case bfd_reloc_overflow: 1569 { 1570 const char *name; 1571 1572 if (h != NULL) 1573 name = NULL; 1574 else 1575 { 1576 name = bfd_elf_string_from_elf_section (input_bfd, 1577 symtab_hdr->sh_link, 1578 sym->st_name); 1579 if (name == NULL) 1580 return FALSE; 1581 if (*name == '\0') 1582 name = bfd_section_name (sec); 1583 } 1584 info->callbacks->reloc_overflow 1585 (info, (h ? &h->root : NULL), name, howto->name, 1586 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1587 } 1588 break; 1589 } 1590 } 1591 } 1592 1593 return TRUE; 1594 } 1595 1596 /* Finish up dynamic symbol handling. We set the contents of various 1597 dynamic sections here. */ 1598 1599 static bfd_boolean 1600 elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info, 1601 struct elf_link_hash_entry *h, 1602 Elf_Internal_Sym *sym) 1603 { 1604 bfd *dynobj; 1605 1606 dynobj = elf_hash_table (info)->dynobj; 1607 1608 if (h->plt.offset != (bfd_vma) -1) 1609 { 1610 asection *splt; 1611 asection *sgot; 1612 asection *srela; 1613 bfd_vma plt_index; 1614 bfd_vma got_offset; 1615 bfd_vma addend; 1616 Elf_Internal_Rela rela; 1617 bfd_byte *loc; 1618 1619 /* This symbol has an entry in the procedure linkage table. Set 1620 it up. */ 1621 BFD_ASSERT (h->dynindx != -1); 1622 1623 splt = elf_hash_table (info)->splt; 1624 sgot = elf_hash_table (info)->sgotplt; 1625 srela = elf_hash_table (info)->srelplt; 1626 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 1627 1628 addend = 2 * (h->plt.offset & 1); 1629 h->plt.offset &= ~1; 1630 1631 /* Get the index in the procedure linkage table which 1632 corresponds to this symbol. This is the index of this symbol 1633 in all the symbols for which we are making plt entries. The 1634 first entry in the procedure linkage table is reserved. */ 1635 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1636 1637 /* Get the offset into the .got table of the entry that 1638 corresponds to this function. Each .got entry is 4 bytes. 1639 The first two are reserved. */ 1640 got_offset = (plt_index + 3) * 4; 1641 1642 /* Fill in the entry in the procedure linkage table. */ 1643 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry, 1644 PLT_ENTRY_SIZE); 1645 1646 /* The offset is relative to the first extension word. */ 1647 bfd_put_32 (output_bfd, 1648 -(h->plt.offset + 8), 1649 splt->contents + h->plt.offset + 4); 1650 1651 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 1652 splt->contents + h->plt.offset + 8); 1653 1654 /* Fill in the entry in the global offset table. */ 1655 bfd_put_32 (output_bfd, 1656 (splt->output_section->vma 1657 + splt->output_offset 1658 + h->plt.offset) + addend, 1659 sgot->contents + got_offset); 1660 1661 /* Fill in the entry in the .rela.plt section. */ 1662 rela.r_offset = (sgot->output_section->vma 1663 + sgot->output_offset 1664 + got_offset); 1665 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT); 1666 rela.r_addend = addend; 1667 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 1668 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1669 1670 if (!h->def_regular) 1671 { 1672 /* Mark the symbol as undefined, rather than as defined in 1673 the .plt section. Leave the value alone. */ 1674 sym->st_shndx = SHN_UNDEF; 1675 } 1676 } 1677 1678 if (h->got.offset != (bfd_vma) -1) 1679 { 1680 asection *sgot; 1681 asection *srela; 1682 Elf_Internal_Rela rela; 1683 bfd_byte *loc; 1684 1685 /* This symbol has an entry in the global offset table. Set it 1686 up. */ 1687 sgot = elf_hash_table (info)->sgot; 1688 srela = elf_hash_table (info)->srelgot; 1689 BFD_ASSERT (sgot != NULL && srela != NULL); 1690 1691 rela.r_offset = (sgot->output_section->vma 1692 + sgot->output_offset 1693 + h->got.offset); 1694 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT); 1695 rela.r_addend = bfd_get_signed_32 (output_bfd, 1696 sgot->contents + h->got.offset); 1697 1698 loc = srela->contents; 1699 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 1700 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1701 } 1702 1703 if (h->needs_copy) 1704 { 1705 asection *s; 1706 Elf_Internal_Rela rela; 1707 bfd_byte *loc; 1708 1709 /* This symbol needs a copy reloc. Set it up. */ 1710 BFD_ASSERT (h->dynindx != -1 1711 && (h->root.type == bfd_link_hash_defined 1712 || h->root.type == bfd_link_hash_defweak)); 1713 1714 s = bfd_get_linker_section (dynobj, ".rela.bss"); 1715 BFD_ASSERT (s != NULL); 1716 1717 rela.r_offset = (h->root.u.def.value 1718 + h->root.u.def.section->output_section->vma 1719 + h->root.u.def.section->output_offset); 1720 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY); 1721 rela.r_addend = 0; 1722 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 1723 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1724 } 1725 1726 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 1727 if (h == elf_hash_table (info)->hdynamic 1728 || h == elf_hash_table (info)->hgot) 1729 sym->st_shndx = SHN_ABS; 1730 1731 return TRUE; 1732 } 1733 1734 /* Finish up the dynamic sections. */ 1735 1736 static bfd_boolean 1737 elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 1738 { 1739 bfd *dynobj; 1740 asection *sgot; 1741 asection *sdyn; 1742 1743 dynobj = elf_hash_table (info)->dynobj; 1744 1745 sgot = elf_hash_table (info)->sgotplt; 1746 BFD_ASSERT (sgot != NULL); 1747 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 1748 1749 if (elf_hash_table (info)->dynamic_sections_created) 1750 { 1751 asection *splt; 1752 Elf32_External_Dyn *dyncon, *dynconend; 1753 1754 splt = elf_hash_table (info)->splt; 1755 BFD_ASSERT (splt != NULL && sdyn != NULL); 1756 1757 dyncon = (Elf32_External_Dyn *) sdyn->contents; 1758 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 1759 for (; dyncon < dynconend; dyncon++) 1760 { 1761 Elf_Internal_Dyn dyn; 1762 asection *s; 1763 1764 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 1765 1766 switch (dyn.d_tag) 1767 { 1768 default: 1769 break; 1770 1771 case DT_PLTGOT: 1772 s = elf_hash_table (info)->sgotplt; 1773 goto get_vma; 1774 case DT_JMPREL: 1775 s = elf_hash_table (info)->srelplt; 1776 get_vma: 1777 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 1778 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1779 break; 1780 1781 case DT_PLTRELSZ: 1782 s = elf_hash_table (info)->srelplt; 1783 dyn.d_un.d_val = s->size; 1784 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1785 break; 1786 } 1787 } 1788 1789 /* Fill in the first entry in the procedure linkage table. */ 1790 if (splt->size > 0) 1791 { 1792 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE); 1793 bfd_put_32 (output_bfd, 1794 (sgot->output_section->vma 1795 + sgot->output_offset + 4 1796 - (splt->output_section->vma + 6)), 1797 splt->contents + 2); 1798 bfd_put_32 (output_bfd, 1799 (sgot->output_section->vma 1800 + sgot->output_offset + 8 1801 - (splt->output_section->vma + 12)), 1802 splt->contents + 8); 1803 elf_section_data (splt->output_section)->this_hdr.sh_entsize 1804 = PLT_ENTRY_SIZE; 1805 } 1806 } 1807 1808 /* Fill in the first three entries in the global offset table. */ 1809 if (sgot->size > 0) 1810 { 1811 if (sdyn == NULL) 1812 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 1813 else 1814 bfd_put_32 (output_bfd, 1815 sdyn->output_section->vma + sdyn->output_offset, 1816 sgot->contents); 1817 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 1818 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 1819 } 1820 1821 if (elf_section_data (sgot->output_section) != NULL) 1822 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 1823 1824 return TRUE; 1825 } 1826 1827 static enum elf_reloc_type_class 1828 elf_vax_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 1829 const asection *rel_sec ATTRIBUTE_UNUSED, 1830 const Elf_Internal_Rela *rela) 1831 { 1832 switch ((int) ELF32_R_TYPE (rela->r_info)) 1833 { 1834 case R_VAX_RELATIVE: 1835 return reloc_class_relative; 1836 case R_VAX_JMP_SLOT: 1837 return reloc_class_plt; 1838 case R_VAX_COPY: 1839 return reloc_class_copy; 1840 default: 1841 return reloc_class_normal; 1842 } 1843 } 1844 1845 static bfd_vma 1846 elf_vax_plt_sym_val (bfd_vma i, const asection *plt, 1847 const arelent *rel ATTRIBUTE_UNUSED) 1848 { 1849 return plt->vma + (i + 1) * PLT_ENTRY_SIZE; 1850 } 1851 1852 #define TARGET_LITTLE_SYM vax_elf32_vec 1853 #define TARGET_LITTLE_NAME "elf32-vax" 1854 #define ELF_MACHINE_CODE EM_VAX 1855 #define ELF_MAXPAGESIZE 0x1000 1856 1857 #define elf_backend_create_dynamic_sections \ 1858 _bfd_elf_create_dynamic_sections 1859 #define bfd_elf32_bfd_link_hash_table_create \ 1860 elf_vax_link_hash_table_create 1861 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link 1862 1863 #define elf_backend_check_relocs elf_vax_check_relocs 1864 #define elf_backend_adjust_dynamic_symbol \ 1865 elf_vax_adjust_dynamic_symbol 1866 #define elf_backend_always_size_sections \ 1867 elf_vax_always_size_sections 1868 #define elf_backend_size_dynamic_sections \ 1869 elf_vax_size_dynamic_sections 1870 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 1871 #define elf_backend_relocate_section elf_vax_relocate_section 1872 #define elf_backend_finish_dynamic_symbol \ 1873 elf_vax_finish_dynamic_symbol 1874 #define elf_backend_finish_dynamic_sections \ 1875 elf_vax_finish_dynamic_sections 1876 #define elf_backend_reloc_type_class elf_vax_reloc_type_class 1877 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook 1878 #define elf_backend_plt_sym_val elf_vax_plt_sym_val 1879 #define bfd_elf32_bfd_merge_private_bfd_data \ 1880 elf32_vax_merge_private_bfd_data 1881 #define bfd_elf32_bfd_set_private_flags \ 1882 elf32_vax_set_private_flags 1883 #define bfd_elf32_bfd_print_private_bfd_data \ 1884 elf32_vax_print_private_bfd_data 1885 1886 #define elf_backend_can_gc_sections 1 1887 #define elf_backend_want_got_plt 1 1888 #define elf_backend_plt_readonly 1 1889 #define elf_backend_want_plt_sym 0 1890 #define elf_backend_got_header_size 16 1891 #define elf_backend_rela_normal 1 1892 #define elf_backend_dtrel_excludes_plt 1 1893 1894 #include "elf32-target.h" 1895
Indexes created Sat Sep 12 00:25:55 UTC 2026