1 /* VAX series support for 32-bit ELF 2 Copyright (C) 1993-2016 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 void 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_merge_private_bfd_data (bfd *, bfd *); 54 static bfd_boolean elf32_vax_print_private_bfd_data (bfd *, void *); 55 56 static reloc_howto_type howto_table[] = { 57 HOWTO (R_VAX_NONE, /* type */ 58 0, /* rightshift */ 59 3, /* size (0 = byte, 1 = short, 2 = long) */ 60 0, /* bitsize */ 61 FALSE, /* pc_relative */ 62 0, /* bitpos */ 63 complain_overflow_dont, /* complain_on_overflow */ 64 bfd_elf_generic_reloc, /* special_function */ 65 "R_VAX_NONE", /* name */ 66 FALSE, /* partial_inplace */ 67 0, /* src_mask */ 68 0x00000000, /* dst_mask */ 69 FALSE), /* pcrel_offset */ 70 71 HOWTO (R_VAX_32, /* type */ 72 0, /* rightshift */ 73 2, /* size (0 = byte, 1 = short, 2 = long) */ 74 32, /* bitsize */ 75 FALSE, /* pc_relative */ 76 0, /* bitpos */ 77 complain_overflow_bitfield, /* complain_on_overflow */ 78 bfd_elf_generic_reloc, /* special_function */ 79 "R_VAX_32", /* name */ 80 FALSE, /* partial_inplace */ 81 0, /* src_mask */ 82 0xffffffff, /* dst_mask */ 83 FALSE), /* pcrel_offset */ 84 85 HOWTO (R_VAX_16, /* type */ 86 0, /* rightshift */ 87 1, /* size (0 = byte, 1 = short, 2 = long) */ 88 16, /* bitsize */ 89 FALSE, /* pc_relative */ 90 0, /* bitpos */ 91 complain_overflow_bitfield, /* complain_on_overflow */ 92 bfd_elf_generic_reloc, /* special_function */ 93 "R_VAX_16", /* name */ 94 FALSE, /* partial_inplace */ 95 0, /* src_mask */ 96 0x0000ffff, /* dst_mask */ 97 FALSE), /* pcrel_offset */ 98 99 HOWTO (R_VAX_8, /* type */ 100 0, /* rightshift */ 101 0, /* size (0 = byte, 1 = short, 2 = long) */ 102 8, /* bitsize */ 103 FALSE, /* pc_relative */ 104 0, /* bitpos */ 105 complain_overflow_bitfield, /* complain_on_overflow */ 106 bfd_elf_generic_reloc, /* special_function */ 107 "R_VAX_8", /* name */ 108 FALSE, /* partial_inplace */ 109 0, /* src_mask */ 110 0x000000ff, /* dst_mask */ 111 FALSE), /* pcrel_offset */ 112 113 HOWTO (R_VAX_PC32, /* type */ 114 0, /* rightshift */ 115 2, /* size (0 = byte, 1 = short, 2 = long) */ 116 32, /* bitsize */ 117 TRUE, /* pc_relative */ 118 0, /* bitpos */ 119 complain_overflow_bitfield, /* complain_on_overflow */ 120 bfd_elf_generic_reloc, /* special_function */ 121 "R_VAX_PC32", /* name */ 122 FALSE, /* partial_inplace */ 123 0, /* src_mask */ 124 0xffffffff, /* dst_mask */ 125 TRUE), /* pcrel_offset */ 126 127 HOWTO (R_VAX_PC16, /* type */ 128 0, /* rightshift */ 129 1, /* size (0 = byte, 1 = short, 2 = long) */ 130 16, /* bitsize */ 131 TRUE, /* pc_relative */ 132 0, /* bitpos */ 133 complain_overflow_signed, /* complain_on_overflow */ 134 bfd_elf_generic_reloc, /* special_function */ 135 "R_VAX_PC16", /* name */ 136 FALSE, /* partial_inplace */ 137 0, /* src_mask */ 138 0x0000ffff, /* dst_mask */ 139 TRUE), /* pcrel_offset */ 140 141 HOWTO (R_VAX_PC8, /* type */ 142 0, /* rightshift */ 143 0, /* size (0 = byte, 1 = short, 2 = long) */ 144 8, /* bitsize */ 145 TRUE, /* pc_relative */ 146 0, /* bitpos */ 147 complain_overflow_signed, /* complain_on_overflow */ 148 bfd_elf_generic_reloc, /* special_function */ 149 "R_VAX_PC8", /* name */ 150 FALSE, /* partial_inplace */ 151 0, /* src_mask */ 152 0x000000ff, /* dst_mask */ 153 TRUE), /* pcrel_offset */ 154 155 HOWTO (R_VAX_GOT32, /* type */ 156 0, /* rightshift */ 157 2, /* size (0 = byte, 1 = short, 2 = long) */ 158 32, /* bitsize */ 159 TRUE, /* pc_relative */ 160 0, /* bitpos */ 161 complain_overflow_bitfield, /* complain_on_overflow */ 162 bfd_elf_generic_reloc, /* special_function */ 163 "R_VAX_GOT32", /* name */ 164 FALSE, /* partial_inplace */ 165 0, /* src_mask */ 166 0xffffffff, /* dst_mask */ 167 TRUE), /* pcrel_offset */ 168 169 EMPTY_HOWTO (-1), 170 EMPTY_HOWTO (-1), 171 EMPTY_HOWTO (-1), 172 EMPTY_HOWTO (-1), 173 EMPTY_HOWTO (-1), 174 175 HOWTO (R_VAX_PLT32, /* type */ 176 0, /* rightshift */ 177 2, /* size (0 = byte, 1 = short, 2 = long) */ 178 32, /* bitsize */ 179 TRUE, /* pc_relative */ 180 0, /* bitpos */ 181 complain_overflow_bitfield, /* complain_on_overflow */ 182 bfd_elf_generic_reloc, /* special_function */ 183 "R_VAX_PLT32", /* name */ 184 FALSE, /* partial_inplace */ 185 0, /* src_mask */ 186 0xffffffff, /* dst_mask */ 187 TRUE), /* pcrel_offset */ 188 189 EMPTY_HOWTO (-1), 190 EMPTY_HOWTO (-1), 191 EMPTY_HOWTO (-1), 192 EMPTY_HOWTO (-1), 193 EMPTY_HOWTO (-1), 194 195 HOWTO (R_VAX_COPY, /* type */ 196 0, /* rightshift */ 197 0, /* size (0 = byte, 1 = short, 2 = long) */ 198 0, /* bitsize */ 199 FALSE, /* pc_relative */ 200 0, /* bitpos */ 201 complain_overflow_dont, /* complain_on_overflow */ 202 bfd_elf_generic_reloc, /* special_function */ 203 "R_VAX_COPY", /* name */ 204 FALSE, /* partial_inplace */ 205 0, /* src_mask */ 206 0xffffffff, /* dst_mask */ 207 FALSE), /* pcrel_offset */ 208 209 HOWTO (R_VAX_GLOB_DAT, /* type */ 210 0, /* rightshift */ 211 2, /* size (0 = byte, 1 = short, 2 = long) */ 212 32, /* bitsize */ 213 FALSE, /* pc_relative */ 214 0, /* bitpos */ 215 complain_overflow_dont, /* complain_on_overflow */ 216 bfd_elf_generic_reloc, /* special_function */ 217 "R_VAX_GLOB_DAT", /* name */ 218 FALSE, /* partial_inplace */ 219 0, /* src_mask */ 220 0xffffffff, /* dst_mask */ 221 FALSE), /* pcrel_offset */ 222 223 HOWTO (R_VAX_JMP_SLOT, /* type */ 224 0, /* rightshift */ 225 2, /* size (0 = byte, 1 = short, 2 = long) */ 226 32, /* bitsize */ 227 FALSE, /* pc_relative */ 228 0, /* bitpos */ 229 complain_overflow_dont, /* complain_on_overflow */ 230 bfd_elf_generic_reloc, /* special_function */ 231 "R_VAX_JMP_SLOT", /* name */ 232 FALSE, /* partial_inplace */ 233 0, /* src_mask */ 234 0xffffffff, /* dst_mask */ 235 FALSE), /* pcrel_offset */ 236 237 HOWTO (R_VAX_RELATIVE, /* type */ 238 0, /* rightshift */ 239 2, /* size (0 = byte, 1 = short, 2 = long) */ 240 32, /* bitsize */ 241 FALSE, /* pc_relative */ 242 0, /* bitpos */ 243 complain_overflow_dont, /* complain_on_overflow */ 244 bfd_elf_generic_reloc, /* special_function */ 245 "R_VAX_RELATIVE", /* name */ 246 FALSE, /* partial_inplace */ 247 0, /* src_mask */ 248 0xffffffff, /* dst_mask */ 249 FALSE), /* pcrel_offset */ 250 251 /* GNU extension to record C++ vtable hierarchy */ 252 HOWTO (R_VAX_GNU_VTINHERIT, /* type */ 253 0, /* rightshift */ 254 2, /* size (0 = byte, 1 = short, 2 = long) */ 255 0, /* bitsize */ 256 FALSE, /* pc_relative */ 257 0, /* bitpos */ 258 complain_overflow_dont, /* complain_on_overflow */ 259 NULL, /* special_function */ 260 "R_VAX_GNU_VTINHERIT", /* name */ 261 FALSE, /* partial_inplace */ 262 0, /* src_mask */ 263 0, /* dst_mask */ 264 FALSE), /* pcrel_offset */ 265 266 /* GNU extension to record C++ vtable member usage */ 267 HOWTO (R_VAX_GNU_VTENTRY, /* type */ 268 0, /* rightshift */ 269 2, /* size (0 = byte, 1 = short, 2 = long) */ 270 0, /* bitsize */ 271 FALSE, /* pc_relative */ 272 0, /* bitpos */ 273 complain_overflow_dont, /* complain_on_overflow */ 274 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 275 "R_VAX_GNU_VTENTRY", /* name */ 276 FALSE, /* partial_inplace */ 277 0, /* src_mask */ 278 0, /* dst_mask */ 279 FALSE), /* pcrel_offset */ 280 }; 281 282 static void 283 rtype_to_howto (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst) 284 { 285 unsigned int r_type; 286 287 r_type = ELF32_R_TYPE (dst->r_info); 288 if (r_type >= R_VAX_max) 289 { 290 (*_bfd_error_handler) (_("%B: unrecognised VAX reloc number: %d"), 291 abfd, r_type); 292 bfd_set_error (bfd_error_bad_value); 293 r_type = R_VAX_NONE; 294 } 295 cache_ptr->howto = &howto_table[r_type]; 296 } 297 298 #define elf_info_to_howto rtype_to_howto 299 300 static const struct 301 { 302 bfd_reloc_code_real_type bfd_val; 303 int elf_val; 304 } reloc_map[] = { 305 { BFD_RELOC_NONE, R_VAX_NONE }, 306 { BFD_RELOC_32, R_VAX_32 }, 307 { BFD_RELOC_16, R_VAX_16 }, 308 { BFD_RELOC_8, R_VAX_8 }, 309 { BFD_RELOC_32_PCREL, R_VAX_PC32 }, 310 { BFD_RELOC_16_PCREL, R_VAX_PC16 }, 311 { BFD_RELOC_8_PCREL, R_VAX_PC8 }, 312 { BFD_RELOC_32_GOT_PCREL, R_VAX_GOT32 }, 313 { BFD_RELOC_32_PLT_PCREL, R_VAX_PLT32 }, 314 { BFD_RELOC_NONE, R_VAX_COPY }, 315 { BFD_RELOC_VAX_GLOB_DAT, R_VAX_GLOB_DAT }, 316 { BFD_RELOC_VAX_JMP_SLOT, R_VAX_JMP_SLOT }, 317 { BFD_RELOC_VAX_RELATIVE, R_VAX_RELATIVE }, 318 { BFD_RELOC_CTOR, R_VAX_32 }, 319 { BFD_RELOC_VTABLE_INHERIT, R_VAX_GNU_VTINHERIT }, 320 { BFD_RELOC_VTABLE_ENTRY, R_VAX_GNU_VTENTRY }, 321 }; 322 323 static reloc_howto_type * 324 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code) 325 { 326 unsigned int i; 327 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) 328 { 329 if (reloc_map[i].bfd_val == code) 330 return &howto_table[reloc_map[i].elf_val]; 331 } 332 return 0; 333 } 334 335 static reloc_howto_type * 336 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 337 const char *r_name) 338 { 339 unsigned int i; 340 341 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) 342 if (howto_table[i].name != NULL 343 && strcasecmp (howto_table[i].name, r_name) == 0) 344 return &howto_table[i]; 345 346 return NULL; 347 } 348 349 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup 350 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup 351 #define ELF_ARCH bfd_arch_vax 352 /* end code generated by elf.el */ 353 354 /* Functions for the VAX ELF linker. */ 355 356 /* The name of the dynamic interpreter. This is put in the .interp 357 section. */ 358 359 #define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so" 360 361 /* The size in bytes of an entry in the procedure linkage table. */ 362 363 #define PLT_ENTRY_SIZE 12 364 365 /* The first entry in a procedure linkage table looks like this. See 366 the SVR4 ABI VAX supplement to see how this works. */ 367 368 static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] = 369 { 370 0xdd, 0xef, /* pushl l^ */ 371 0, 0, 0, 0, /* offset to .plt.got + 4 */ 372 0x17, 0xff, /* jmp @L^(pc) */ 373 0, 0, 0, 0, /* offset to .plt.got + 8 */ 374 }; 375 376 /* Subsequent entries in a procedure linkage table look like this. */ 377 378 static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] = 379 { 380 0xfc, 0x0f, /* .word ^M<r11:r2> */ 381 0x16, 0xef, /* jsb L^(pc) */ 382 0, 0, 0, 0, /* replaced with offset to start of .plt */ 383 0, 0, 0, 0, /* index into .rela.plt */ 384 }; 385 386 /* The VAX linker needs to keep track of the number of relocs that it 387 decides to copy in check_relocs for each symbol. This is so that it 388 can discard PC relative relocs if it doesn't need them when linking 389 with -Bsymbolic. We store the information in a field extending the 390 regular ELF linker hash table. */ 391 392 /* This structure keeps track of the number of PC relative relocs we have 393 copied for a given symbol. */ 394 395 struct elf_vax_pcrel_relocs_copied 396 { 397 /* Next section. */ 398 struct elf_vax_pcrel_relocs_copied *next; 399 /* A section in dynobj. */ 400 asection *section; 401 /* Number of relocs copied in this section. */ 402 bfd_size_type count; 403 }; 404 405 /* VAX ELF linker hash entry. */ 406 407 struct elf_vax_link_hash_entry 408 { 409 struct elf_link_hash_entry root; 410 411 /* Number of PC relative relocs copied for this symbol. */ 412 struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied; 413 414 bfd_vma got_addend; 415 }; 416 417 /* Declare this now that the above structures are defined. */ 418 419 static bfd_boolean elf_vax_discard_copies (struct elf_vax_link_hash_entry *, 420 void *); 421 422 /* Declare this now that the above structures are defined. */ 423 424 static bfd_boolean elf_vax_instantiate_got_entries (struct elf_link_hash_entry *, 425 void *); 426 427 /* Traverse an VAX ELF linker hash table. */ 428 429 #define elf_vax_link_hash_traverse(table, func, info) \ 430 (elf_link_hash_traverse \ 431 ((table), \ 432 (bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \ 433 (info))) 434 435 /* Create an entry in an VAX ELF linker hash table. */ 436 437 static struct bfd_hash_entry * 438 elf_vax_link_hash_newfunc (struct bfd_hash_entry *entry, 439 struct bfd_hash_table *table, 440 const char *string) 441 { 442 struct elf_vax_link_hash_entry *ret = 443 (struct elf_vax_link_hash_entry *) entry; 444 445 /* Allocate the structure if it has not already been allocated by a 446 subclass. */ 447 if (ret == NULL) 448 ret = ((struct elf_vax_link_hash_entry *) 449 bfd_hash_allocate (table, 450 sizeof (struct elf_vax_link_hash_entry))); 451 if (ret == NULL) 452 return (struct bfd_hash_entry *) ret; 453 454 /* Call the allocation method of the superclass. */ 455 ret = ((struct elf_vax_link_hash_entry *) 456 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 457 table, string)); 458 if (ret != NULL) 459 { 460 ret->pcrel_relocs_copied = NULL; 461 } 462 463 return (struct bfd_hash_entry *) ret; 464 } 465 466 /* Create an VAX ELF linker hash table. */ 467 468 static struct bfd_link_hash_table * 469 elf_vax_link_hash_table_create (bfd *abfd) 470 { 471 struct elf_link_hash_table *ret; 472 bfd_size_type amt = sizeof (struct elf_link_hash_table); 473 474 ret = bfd_zmalloc (amt); 475 if (ret == NULL) 476 return NULL; 477 478 if (!_bfd_elf_link_hash_table_init (ret, abfd, 479 elf_vax_link_hash_newfunc, 480 sizeof (struct elf_vax_link_hash_entry), 481 GENERIC_ELF_DATA)) 482 { 483 free (ret); 484 return NULL; 485 } 486 487 return &ret->root; 488 } 489 490 /* Keep vax-specific flags in the ELF header */ 491 static bfd_boolean 492 elf32_vax_set_private_flags (bfd *abfd, flagword flags) 493 { 494 elf_elfheader (abfd)->e_flags = flags; 495 elf_flags_init (abfd) = TRUE; 496 return TRUE; 497 } 498 499 /* Copy vax-specific data from one module to another */ 500 static bfd_boolean 501 elf32_vax_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 502 { 503 flagword in_flags; 504 505 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 506 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 507 return TRUE; 508 509 in_flags = elf_elfheader (ibfd)->e_flags; 510 511 elf_elfheader (obfd)->e_flags = in_flags; 512 elf_flags_init (obfd) = TRUE; 513 514 return TRUE; 515 } 516 517 /* Merge backend specific data from an object file to the output 518 object file when linking. */ 519 static bfd_boolean 520 elf32_vax_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 521 { 522 flagword in_flags; 523 524 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 525 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 526 return TRUE; 527 528 in_flags = elf_elfheader (ibfd)->e_flags; 529 530 if (!elf_flags_init (obfd)) 531 { 532 elf_flags_init (obfd) = TRUE; 533 elf_elfheader (obfd)->e_flags = in_flags; 534 } 535 536 return TRUE; 537 } 538 539 /* Display the flags field */ 540 static bfd_boolean 541 elf32_vax_print_private_bfd_data (bfd *abfd, void * ptr) 542 { 543 FILE *file = (FILE *) ptr; 544 545 BFD_ASSERT (abfd != NULL && ptr != NULL); 546 547 /* Print normal ELF private data. */ 548 _bfd_elf_print_private_bfd_data (abfd, ptr); 549 550 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ 551 552 /* xgettext:c-format */ 553 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 554 555 if (elf_elfheader (abfd)->e_flags & EF_VAX_NONPIC) 556 fprintf (file, _(" [nonpic]")); 557 558 if (elf_elfheader (abfd)->e_flags & EF_VAX_DFLOAT) 559 fprintf (file, _(" [d-float]")); 560 561 if (elf_elfheader (abfd)->e_flags & EF_VAX_GFLOAT) 562 fprintf (file, _(" [g-float]")); 563 564 fputc ('\n', file); 565 566 return TRUE; 567 } 568 /* Look through the relocs for a section during the first phase, and 569 allocate space in the global offset table or procedure linkage 570 table. */ 571 572 static bfd_boolean 573 elf_vax_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, 574 const Elf_Internal_Rela *relocs) 575 { 576 bfd *dynobj; 577 Elf_Internal_Shdr *symtab_hdr; 578 struct elf_link_hash_entry **sym_hashes; 579 const Elf_Internal_Rela *rel; 580 const Elf_Internal_Rela *rel_end; 581 asection *sgot; 582 asection *srelgot; 583 asection *sreloc; 584 585 if (bfd_link_relocatable (info)) 586 return TRUE; 587 588 dynobj = elf_hash_table (info)->dynobj; 589 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 590 sym_hashes = elf_sym_hashes (abfd); 591 592 sgot = NULL; 593 srelgot = NULL; 594 sreloc = NULL; 595 596 rel_end = relocs + sec->reloc_count; 597 for (rel = relocs; rel < rel_end; rel++) 598 { 599 unsigned long r_symndx; 600 struct elf_link_hash_entry *h; 601 602 r_symndx = ELF32_R_SYM (rel->r_info); 603 604 if (r_symndx < symtab_hdr->sh_info) 605 h = NULL; 606 else 607 { 608 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 609 while (h->root.type == bfd_link_hash_indirect 610 || h->root.type == bfd_link_hash_warning) 611 h = (struct elf_link_hash_entry *) h->root.u.i.link; 612 613 /* PR15323, ref flags aren't set for references in the same 614 object. */ 615 h->root.non_ir_ref = 1; 616 } 617 618 switch (ELF32_R_TYPE (rel->r_info)) 619 { 620 case R_VAX_GOT32: 621 BFD_ASSERT (h != NULL); 622 623 /* If this is a local symbol, we resolve it directly without 624 creating a global offset table entry. */ 625 if (h->forced_local 626 || h == elf_hash_table (info)->hgot 627 || h == elf_hash_table (info)->hplt) 628 break; 629 630 /* This symbol requires a global offset table entry. */ 631 632 if (dynobj == NULL) 633 { 634 /* Create the .got section. */ 635 elf_hash_table (info)->dynobj = dynobj = abfd; 636 if (!_bfd_elf_create_got_section (dynobj, info)) 637 return FALSE; 638 } 639 640 if (sgot == NULL) 641 { 642 sgot = bfd_get_linker_section (dynobj, ".got"); 643 BFD_ASSERT (sgot != NULL); 644 } 645 646 if (srelgot == NULL 647 && (h != NULL || bfd_link_pic (info))) 648 { 649 srelgot = bfd_get_linker_section (dynobj, ".rela.got"); 650 if (srelgot == NULL) 651 { 652 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS 653 | SEC_IN_MEMORY | SEC_LINKER_CREATED 654 | SEC_READONLY); 655 656 srelgot = bfd_make_section_anyway_with_flags (dynobj, 657 ".rela.got", 658 flags); 659 if (srelgot == NULL 660 || !bfd_set_section_alignment (dynobj, srelgot, 2)) 661 return FALSE; 662 } 663 } 664 665 if (h != NULL) 666 { 667 struct elf_vax_link_hash_entry *eh; 668 669 eh = (struct elf_vax_link_hash_entry *) h; 670 if (h->got.refcount == -1) 671 { 672 h->got.refcount = 1; 673 eh->got_addend = rel->r_addend; 674 } 675 else 676 { 677 h->got.refcount++; 678 if (eh->got_addend != (bfd_vma) rel->r_addend) 679 (*_bfd_error_handler) 680 (_("%s: warning: GOT addend of %ld to `%s' does" 681 " not match previous GOT addend of %ld"), 682 bfd_get_filename (abfd), rel->r_addend, 683 h->root.root.string, 684 eh->got_addend); 685 686 } 687 } 688 break; 689 690 case R_VAX_PLT32: 691 /* This symbol requires a procedure linkage table entry. We 692 actually build the entry in adjust_dynamic_symbol, 693 because this might be a case of linking PIC code which is 694 never referenced by a dynamic object, in which case we 695 don't need to generate a procedure linkage table entry 696 after all. */ 697 BFD_ASSERT (h != NULL); 698 699 /* If this is a local symbol, we resolve it directly without 700 creating a procedure linkage table entry. */ 701 if (h->forced_local) 702 break; 703 704 h->needs_plt = 1; 705 if (h->plt.refcount == -1) 706 h->plt.refcount = 1; 707 else 708 h->plt.refcount++; 709 break; 710 711 case R_VAX_PC8: 712 case R_VAX_PC16: 713 case R_VAX_PC32: 714 /* If we are creating a shared library and this is not a local 715 symbol, we need to copy the reloc into the shared library. 716 However when linking with -Bsymbolic and this is a global 717 symbol which is defined in an object we are including in the 718 link (i.e., DEF_REGULAR is set), then we can resolve the 719 reloc directly. At this point we have not seen all the input 720 files, so it is possible that DEF_REGULAR is not set now but 721 will be set later (it is never cleared). We account for that 722 possibility below by storing information in the 723 pcrel_relocs_copied field of the hash table entry. */ 724 if (!(bfd_link_pic (info) 725 && (sec->flags & SEC_ALLOC) != 0 726 && h != NULL 727 && (!info->symbolic 728 || !h->def_regular))) 729 { 730 if (h != NULL 731 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 732 && !h->forced_local) 733 { 734 /* Make sure a plt entry is created for this symbol if 735 it turns out to be a function defined by a dynamic 736 object. */ 737 if (h->plt.refcount == -1) 738 h->plt.refcount = 1; 739 else 740 h->plt.refcount++; 741 } 742 break; 743 } 744 /* If this is a local symbol, we can resolve it directly. */ 745 if (h != NULL 746 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 747 || h->forced_local)) 748 break; 749 750 /* Fall through. */ 751 case R_VAX_8: 752 case R_VAX_16: 753 case R_VAX_32: 754 if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) 755 { 756 /* Make sure a plt entry is created for this symbol if it 757 turns out to be a function defined by a dynamic object. */ 758 if (h->plt.refcount == -1) 759 h->plt.refcount = 1; 760 else 761 h->plt.refcount++; 762 } 763 764 /* If we are creating a shared library, we need to copy the 765 reloc into the shared library. */ 766 if (bfd_link_pic (info) 767 && (sec->flags & SEC_ALLOC) != 0) 768 { 769 /* When creating a shared object, we must copy these 770 reloc types into the output file. We create a reloc 771 section in dynobj and make room for this reloc. */ 772 if (sreloc == NULL) 773 { 774 sreloc = _bfd_elf_make_dynamic_reloc_section 775 (sec, dynobj, 2, abfd, /*rela?*/ TRUE); 776 777 if (sreloc == NULL) 778 return FALSE; 779 780 if (sec->flags & SEC_READONLY) 781 { 782 if (info->warn_shared_textrel) 783 (*_bfd_error_handler) 784 (_("warning: dynamic relocation to `%s' in readonly section `%s'"), 785 h ? h->root.root.string : "?", sec->name); 786 info->flags |= DF_TEXTREL; 787 } 788 } 789 790 sreloc->size += sizeof (Elf32_External_Rela); 791 792 /* If we are linking with -Bsymbolic, we count the number of 793 PC relative relocations we have entered for this symbol, 794 so that we can discard them again if the symbol is later 795 defined by a regular object. Note that this function is 796 only called if we are using a vaxelf linker hash table, 797 which means that h is really a pointer to an 798 elf_vax_link_hash_entry. */ 799 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8 800 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16 801 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32) 802 && info->symbolic) 803 { 804 struct elf_vax_link_hash_entry *eh; 805 struct elf_vax_pcrel_relocs_copied *p; 806 807 eh = (struct elf_vax_link_hash_entry *) h; 808 809 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) 810 if (p->section == sreloc) 811 break; 812 813 if (p == NULL) 814 { 815 p = ((struct elf_vax_pcrel_relocs_copied *) 816 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 817 if (p == NULL) 818 return FALSE; 819 p->next = eh->pcrel_relocs_copied; 820 eh->pcrel_relocs_copied = p; 821 p->section = sreloc; 822 p->count = 0; 823 } 824 825 ++p->count; 826 } 827 } 828 829 break; 830 831 /* This relocation describes the C++ object vtable hierarchy. 832 Reconstruct it for later use during GC. */ 833 case R_VAX_GNU_VTINHERIT: 834 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 835 return FALSE; 836 break; 837 838 /* This relocation describes which C++ vtable entries are actually 839 used. Record for later use during GC. */ 840 case R_VAX_GNU_VTENTRY: 841 BFD_ASSERT (h != NULL); 842 if (h != NULL 843 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 844 return FALSE; 845 break; 846 847 default: 848 break; 849 } 850 } 851 852 return TRUE; 853 } 854 855 /* Return the section that should be marked against GC for a given 856 relocation. */ 857 858 static asection * 859 elf_vax_gc_mark_hook (asection *sec, 860 struct bfd_link_info *info, 861 Elf_Internal_Rela *rel, 862 struct elf_link_hash_entry *h, 863 Elf_Internal_Sym *sym) 864 { 865 if (h != NULL) 866 switch (ELF32_R_TYPE (rel->r_info)) 867 { 868 case R_VAX_GNU_VTINHERIT: 869 case R_VAX_GNU_VTENTRY: 870 return NULL; 871 } 872 873 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 874 } 875 876 /* Update the got entry reference counts for the section being removed. */ 877 878 static bfd_boolean 879 elf_vax_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, asection *sec, 880 const Elf_Internal_Rela *relocs) 881 { 882 Elf_Internal_Shdr *symtab_hdr; 883 struct elf_link_hash_entry **sym_hashes; 884 const Elf_Internal_Rela *rel, *relend; 885 bfd *dynobj; 886 887 if (bfd_link_relocatable (info)) 888 return TRUE; 889 890 dynobj = elf_hash_table (info)->dynobj; 891 if (dynobj == NULL) 892 return TRUE; 893 894 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 895 sym_hashes = elf_sym_hashes (abfd); 896 897 relend = relocs + sec->reloc_count; 898 for (rel = relocs; rel < relend; rel++) 899 { 900 unsigned long r_symndx; 901 struct elf_link_hash_entry *h = NULL; 902 903 r_symndx = ELF32_R_SYM (rel->r_info); 904 if (r_symndx >= symtab_hdr->sh_info) 905 { 906 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 907 while (h->root.type == bfd_link_hash_indirect 908 || h->root.type == bfd_link_hash_warning) 909 h = (struct elf_link_hash_entry *) h->root.u.i.link; 910 } 911 912 switch (ELF32_R_TYPE (rel->r_info)) 913 { 914 case R_VAX_GOT32: 915 if (h != NULL && h->got.refcount > 0) 916 --h->got.refcount; 917 break; 918 919 case R_VAX_PLT32: 920 case R_VAX_PC8: 921 case R_VAX_PC16: 922 case R_VAX_PC32: 923 case R_VAX_8: 924 case R_VAX_16: 925 case R_VAX_32: 926 if (h != NULL && h->plt.refcount > 0) 927 --h->plt.refcount; 928 break; 929 930 default: 931 break; 932 } 933 } 934 935 return TRUE; 936 } 937 938 /* Adjust a symbol defined by a dynamic object and referenced by a 939 regular object. The current definition is in some section of the 940 dynamic object, but we're not including those sections. We have to 941 change the definition to something the rest of the link can 942 understand. */ 943 944 static bfd_boolean 945 elf_vax_adjust_dynamic_symbol (struct bfd_link_info *info, 946 struct elf_link_hash_entry *h) 947 { 948 bfd *dynobj; 949 asection *s; 950 951 dynobj = elf_hash_table (info)->dynobj; 952 953 /* Make sure we know what is going on here. */ 954 BFD_ASSERT (dynobj != NULL 955 && (h->needs_plt 956 || h->type == STT_GNU_IFUNC 957 || h->u.weakdef != NULL 958 || (h->def_dynamic 959 && h->ref_regular 960 && !h->def_regular))); 961 962 /* If this is a function, put it in the procedure linkage table. We 963 will fill in the contents of the procedure linkage table later, 964 when we know the address of the .got section. */ 965 if ((h->type == STT_FUNC || h->type == STT_GNU_IFUNC) 966 || h->needs_plt) 967 { 968 if (h->plt.refcount <= 0 969 || SYMBOL_CALLS_LOCAL (info, h) 970 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 971 && h->root.type == bfd_link_hash_undefweak)) 972 { 973 /* This case can occur if we saw a PLTxx reloc in an input 974 file, but the symbol was never referred to by a dynamic 975 object, or if all references were garbage collected. In 976 such a case, we don't actually need to build a procedure 977 linkage table, and we can just do a PCxx reloc instead. */ 978 h->plt.offset = (bfd_vma) -1; 979 h->needs_plt = 0; 980 return TRUE; 981 } 982 983 s = bfd_get_linker_section (dynobj, ".plt"); 984 BFD_ASSERT (s != NULL); 985 986 /* If this is the first .plt entry, make room for the special 987 first entry. */ 988 if (s->size == 0) 989 { 990 s->size += PLT_ENTRY_SIZE; 991 } 992 993 /* If this symbol is not defined in a regular file, and we are 994 not generating a shared library, then set the symbol to this 995 location in the .plt. This is required to make function 996 pointers compare as equal between the normal executable and 997 the shared library. */ 998 if (!bfd_link_pic (info) 999 && !h->def_regular) 1000 { 1001 h->root.u.def.section = s; 1002 h->root.u.def.value = s->size; 1003 } 1004 1005 h->plt.offset = s->size; 1006 1007 /* Make room for this entry. */ 1008 s->size += PLT_ENTRY_SIZE; 1009 1010 /* We also need to make an entry in the .got.plt section, which 1011 will be placed in the .got section by the linker script. */ 1012 1013 s = bfd_get_linker_section (dynobj, ".got.plt"); 1014 BFD_ASSERT (s != NULL); 1015 s->size += 4; 1016 1017 /* We also need to make an entry in the .rela.plt section. */ 1018 1019 s = bfd_get_linker_section (dynobj, ".rela.plt"); 1020 BFD_ASSERT (s != NULL); 1021 s->size += sizeof (Elf32_External_Rela); 1022 1023 return TRUE; 1024 } 1025 1026 /* Reinitialize the plt offset now that it is not used as a reference 1027 count any more. */ 1028 h->plt.offset = (bfd_vma) -1; 1029 1030 /* If this is a weak symbol, and there is a real definition, the 1031 processor independent code will have arranged for us to see the 1032 real definition first, and we can just use the same value. */ 1033 if (h->u.weakdef != NULL) 1034 { 1035 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1036 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1037 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1038 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1039 return TRUE; 1040 } 1041 1042 /* This is a reference to a symbol defined by a dynamic object which 1043 is not a function. */ 1044 1045 /* If we are creating a shared library, we must presume that the 1046 only references to the symbol are via the global offset table. 1047 For such cases we need not do anything here; the relocations will 1048 be handled correctly by relocate_section. */ 1049 if (bfd_link_pic (info)) 1050 return TRUE; 1051 1052 /* We must allocate the symbol in our .dynbss section, which will 1053 become part of the .bss section of the executable. There will be 1054 an entry for this symbol in the .dynsym section. The dynamic 1055 object will contain position independent code, so all references 1056 from the dynamic object to this symbol will go through the global 1057 offset table. The dynamic linker will use the .dynsym entry to 1058 determine the address it must put in the global offset table, so 1059 both the dynamic object and the regular object will refer to the 1060 same memory location for the variable. */ 1061 1062 s = bfd_get_linker_section (dynobj, ".dynbss"); 1063 BFD_ASSERT (s != NULL); 1064 1065 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to 1066 copy the initial value out of the dynamic object and into the 1067 runtime process image. We need to remember the offset into the 1068 .rela.bss section we are going to use. */ 1069 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 1070 { 1071 asection *srel; 1072 1073 srel = bfd_get_linker_section (dynobj, ".rela.bss"); 1074 BFD_ASSERT (srel != NULL); 1075 srel->size += sizeof (Elf32_External_Rela); 1076 h->needs_copy = 1; 1077 } 1078 1079 return _bfd_elf_adjust_dynamic_copy (info, h, s); 1080 } 1081 1082 /* This function is called via elf_link_hash_traverse. It resets GOT 1083 and PLT (.GOT) reference counts back to -1 so normal PC32 relocation 1084 will be done. */ 1085 1086 static bfd_boolean 1087 elf_vax_discard_got_entries (struct elf_link_hash_entry *h, 1088 void *infoptr ATTRIBUTE_UNUSED) 1089 { 1090 h->got.refcount = -1; 1091 h->plt.refcount = -1; 1092 1093 return TRUE; 1094 } 1095 1096 /* Discard unused dynamic data if this is a static link. */ 1097 1098 static bfd_boolean 1099 elf_vax_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 1100 struct bfd_link_info *info) 1101 { 1102 bfd *dynobj; 1103 asection *s; 1104 1105 dynobj = elf_hash_table (info)->dynobj; 1106 1107 if (dynobj && !elf_hash_table (info)->dynamic_sections_created) 1108 { 1109 /* We may have created entries in the .rela.got and .got sections. 1110 However, if we are not creating the dynamic sections, we will 1111 not actually use these entries. Reset the size of .rela.got 1112 and .got, which will cause them to get stripped from the output 1113 file below. */ 1114 s = bfd_get_linker_section (dynobj, ".rela.got"); 1115 if (s != NULL) 1116 s->size = 0; 1117 s = bfd_get_linker_section (dynobj, ".got.plt"); 1118 if (s != NULL) 1119 s->size = 0; 1120 s = bfd_get_linker_section (dynobj, ".got"); 1121 if (s != NULL) 1122 s->size = 0; 1123 } 1124 1125 /* If this is a static link, we need to discard all the got entries we've 1126 recorded. */ 1127 if (!dynobj || !elf_hash_table (info)->dynamic_sections_created) 1128 elf_link_hash_traverse (elf_hash_table (info), 1129 elf_vax_discard_got_entries, 1130 info); 1131 1132 return TRUE; 1133 } 1134 1135 /* Set the sizes of the dynamic sections. */ 1136 1137 static bfd_boolean 1138 elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 1139 { 1140 bfd *dynobj; 1141 asection *s; 1142 bfd_boolean plt; 1143 bfd_boolean relocs; 1144 bfd_boolean reltext; 1145 1146 dynobj = elf_hash_table (info)->dynobj; 1147 BFD_ASSERT (dynobj != NULL); 1148 1149 if (elf_hash_table (info)->dynamic_sections_created) 1150 { 1151 /* Set the contents of the .interp section to the interpreter. */ 1152 if (bfd_link_executable (info) && !info->nointerp) 1153 { 1154 s = bfd_get_linker_section (dynobj, ".interp"); 1155 BFD_ASSERT (s != NULL); 1156 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1157 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1158 } 1159 } 1160 1161 /* If this is a -Bsymbolic shared link, then we need to discard all PC 1162 relative relocs against symbols defined in a regular object. We 1163 allocated space for them in the check_relocs routine, but we will not 1164 fill them in in the relocate_section routine. */ 1165 if (bfd_link_pic (info) && info->symbolic) 1166 elf_vax_link_hash_traverse (elf_hash_table (info), 1167 elf_vax_discard_copies, 1168 NULL); 1169 1170 /* If this is a -Bsymbolic shared link, we need to discard all the got 1171 entries we've recorded. Otherwise, we need to instantiate (allocate 1172 space for them). */ 1173 elf_link_hash_traverse (elf_hash_table (info), 1174 elf_vax_instantiate_got_entries, 1175 info); 1176 1177 /* The check_relocs and adjust_dynamic_symbol entry points have 1178 determined the sizes of the various dynamic sections. Allocate 1179 memory for them. */ 1180 plt = FALSE; 1181 relocs = FALSE; 1182 reltext = FALSE; 1183 for (s = dynobj->sections; s != NULL; s = s->next) 1184 { 1185 const char *name; 1186 1187 if ((s->flags & SEC_LINKER_CREATED) == 0) 1188 continue; 1189 1190 /* It's OK to base decisions on the section name, because none 1191 of the dynobj section names depend upon the input files. */ 1192 name = bfd_get_section_name (dynobj, s); 1193 1194 if (strcmp (name, ".plt") == 0) 1195 { 1196 /* Remember whether there is a PLT. */ 1197 plt = s->size != 0; 1198 } 1199 else if (CONST_STRNEQ (name, ".rela")) 1200 { 1201 if (s->size != 0) 1202 { 1203 asection *target; 1204 1205 /* Remember whether there are any reloc sections other 1206 than .rela.plt. */ 1207 if (strcmp (name, ".rela.plt") != 0) 1208 { 1209 const char *outname; 1210 1211 relocs = TRUE; 1212 1213 /* If this relocation section applies to a read only 1214 section, then we probably need a DT_TEXTREL 1215 entry. .rela.plt is actually associated with 1216 .got.plt, which is never readonly. */ 1217 outname = bfd_get_section_name (output_bfd, 1218 s->output_section); 1219 target = bfd_get_section_by_name (output_bfd, outname + 5); 1220 if (target != NULL 1221 && (target->flags & SEC_READONLY) != 0 1222 && (target->flags & SEC_ALLOC) != 0) 1223 reltext = TRUE; 1224 } 1225 1226 /* We use the reloc_count field as a counter if we need 1227 to copy relocs into the output file. */ 1228 s->reloc_count = 0; 1229 } 1230 } 1231 else if (! CONST_STRNEQ (name, ".got") 1232 && strcmp (name, ".dynbss") != 0) 1233 { 1234 /* It's not one of our sections, so don't allocate space. */ 1235 continue; 1236 } 1237 1238 if (s->size == 0) 1239 { 1240 /* If we don't need this section, strip it from the 1241 output file. This is mostly to handle .rela.bss and 1242 .rela.plt. We must create both sections in 1243 create_dynamic_sections, because they must be created 1244 before the linker maps input sections to output 1245 sections. The linker does that before 1246 adjust_dynamic_symbol is called, and it is that 1247 function which decides whether anything needs to go 1248 into these sections. */ 1249 s->flags |= SEC_EXCLUDE; 1250 continue; 1251 } 1252 1253 if ((s->flags & SEC_HAS_CONTENTS) == 0) 1254 continue; 1255 1256 /* Allocate memory for the section contents. */ 1257 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 1258 if (s->contents == NULL) 1259 return FALSE; 1260 } 1261 1262 if (elf_hash_table (info)->dynamic_sections_created) 1263 { 1264 /* Add some entries to the .dynamic section. We fill in the 1265 values later, in elf_vax_finish_dynamic_sections, but we 1266 must add the entries now so that we get the correct size for 1267 the .dynamic section. The DT_DEBUG entry is filled in by the 1268 dynamic linker and used by the debugger. */ 1269 #define add_dynamic_entry(TAG, VAL) \ 1270 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 1271 1272 if (!bfd_link_pic (info)) 1273 { 1274 if (!add_dynamic_entry (DT_DEBUG, 0)) 1275 return FALSE; 1276 } 1277 1278 if (plt) 1279 { 1280 if (!add_dynamic_entry (DT_PLTGOT, 0) 1281 || !add_dynamic_entry (DT_PLTRELSZ, 0) 1282 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 1283 || !add_dynamic_entry (DT_JMPREL, 0)) 1284 return FALSE; 1285 } 1286 1287 if (relocs) 1288 { 1289 if (!add_dynamic_entry (DT_RELA, 0) 1290 || !add_dynamic_entry (DT_RELASZ, 0) 1291 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 1292 return FALSE; 1293 } 1294 1295 if (reltext || (info->flags & DF_TEXTREL) != 0) 1296 { 1297 if (!add_dynamic_entry (DT_TEXTREL, 0)) 1298 return FALSE; 1299 } 1300 } 1301 #undef add_dynamic_entry 1302 1303 return TRUE; 1304 } 1305 1306 /* This function is called via elf_vax_link_hash_traverse if we are 1307 creating a shared object with -Bsymbolic. It discards the space 1308 allocated to copy PC relative relocs against symbols which are defined 1309 in regular objects. We allocated space for them in the check_relocs 1310 routine, but we won't fill them in in the relocate_section routine. */ 1311 1312 static bfd_boolean 1313 elf_vax_discard_copies (struct elf_vax_link_hash_entry *h, 1314 void * ignore ATTRIBUTE_UNUSED) 1315 { 1316 struct elf_vax_pcrel_relocs_copied *s; 1317 1318 /* We only discard relocs for symbols defined in a regular object. */ 1319 if (!h->root.def_regular) 1320 return TRUE; 1321 1322 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) 1323 s->section->size -= s->count * sizeof (Elf32_External_Rela); 1324 1325 return TRUE; 1326 } 1327 1328 /* This function is called via elf_link_hash_traverse. It looks for 1329 entries that have GOT or PLT (.GOT) references. If creating a shared 1330 object with -Bsymbolic, or the symbol has been forced local, then it 1331 resets the reference count back to -1 so normal PC32 relocation will 1332 be done. Otherwise space in the .got and .rela.got will be reserved 1333 for the symbol. */ 1334 1335 static bfd_boolean 1336 elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, void * infoptr) 1337 { 1338 struct bfd_link_info *info = (struct bfd_link_info *) infoptr; 1339 bfd *dynobj; 1340 asection *sgot; 1341 asection *srelgot; 1342 1343 /* We don't care about non-GOT (and non-PLT) entries. */ 1344 if (h->got.refcount <= 0 && h->plt.refcount <= 0) 1345 return TRUE; 1346 1347 dynobj = elf_hash_table (info)->dynobj; 1348 BFD_ASSERT (dynobj != NULL); 1349 1350 sgot = bfd_get_linker_section (dynobj, ".got"); 1351 srelgot = bfd_get_linker_section (dynobj, ".rela.got"); 1352 1353 if (SYMBOL_REFERENCES_LOCAL (info, h)) 1354 { 1355 h->got.refcount = -1; 1356 h->plt.refcount = -1; 1357 } 1358 else if (h->got.refcount > 0) 1359 { 1360 /* Make sure this symbol is output as a dynamic symbol. */ 1361 if (h->dynindx == -1) 1362 { 1363 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 1364 return FALSE; 1365 } 1366 1367 /* Allocate space in the .got and .rela.got sections. */ 1368 if (bfd_link_pic (info) || WILL_CALL_FINISH_DYNAMIC_SYMBOL ( 1369 elf_hash_table (info)->dynamic_sections_created, 0, h)) 1370 { 1371 sgot->size += 4; 1372 srelgot->size += sizeof (Elf32_External_Rela); 1373 } 1374 } 1375 1376 return TRUE; 1377 } 1378 1379 /* Relocate an VAX ELF section. */ 1380 1381 static bfd_boolean 1382 elf_vax_relocate_section (bfd *output_bfd, 1383 struct bfd_link_info *info, 1384 bfd *input_bfd, 1385 asection *input_section, 1386 bfd_byte *contents, 1387 Elf_Internal_Rela *relocs, 1388 Elf_Internal_Sym *local_syms, 1389 asection **local_sections) 1390 { 1391 bfd *dynobj; 1392 Elf_Internal_Shdr *symtab_hdr; 1393 struct elf_link_hash_entry **sym_hashes; 1394 bfd_vma plt_index; 1395 bfd_vma got_offset; 1396 asection *sgot; 1397 asection *splt; 1398 asection *sgotplt; 1399 asection *sreloc; 1400 Elf_Internal_Rela *rel; 1401 Elf_Internal_Rela *relend; 1402 1403 dynobj = elf_hash_table (info)->dynobj; 1404 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1405 sym_hashes = elf_sym_hashes (input_bfd); 1406 1407 sgot = NULL; 1408 splt = NULL; 1409 sgotplt = NULL; 1410 sreloc = NULL; 1411 1412 rel = relocs; 1413 relend = relocs + input_section->reloc_count; 1414 for (; rel < relend; rel++) 1415 { 1416 int r_type; 1417 reloc_howto_type *howto; 1418 unsigned long r_symndx; 1419 struct elf_link_hash_entry *h; 1420 Elf_Internal_Sym *sym; 1421 asection *sec; 1422 bfd_vma relocation; 1423 bfd_reloc_status_type r; 1424 1425 r_type = ELF32_R_TYPE (rel->r_info); 1426 if (r_type < 0 || r_type >= (int) R_VAX_max) 1427 { 1428 bfd_set_error (bfd_error_bad_value); 1429 return FALSE; 1430 } 1431 howto = howto_table + r_type; 1432 1433 r_symndx = ELF32_R_SYM (rel->r_info); 1434 h = NULL; 1435 sym = NULL; 1436 sec = NULL; 1437 if (r_symndx < symtab_hdr->sh_info) 1438 { 1439 sym = local_syms + r_symndx; 1440 sec = local_sections[r_symndx]; 1441 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1442 } 1443 else 1444 { 1445 bfd_boolean unresolved_reloc; 1446 bfd_boolean warned, ignored; 1447 1448 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1449 r_symndx, symtab_hdr, sym_hashes, 1450 h, sec, relocation, 1451 unresolved_reloc, warned, ignored); 1452 1453 if ((h->root.type == bfd_link_hash_defined 1454 || h->root.type == bfd_link_hash_defweak) 1455 && ((r_type == R_VAX_PLT32 1456 && h->plt.offset != (bfd_vma) -1 1457 && !h->forced_local 1458 && elf_hash_table (info)->dynamic_sections_created) 1459 || (r_type == R_VAX_GOT32 1460 && h->got.offset != (bfd_vma) -1 1461 && !h->forced_local 1462 && elf_hash_table (info)->dynamic_sections_created 1463 && (! bfd_link_pic (info) 1464 || (! info->symbolic && h->dynindx != -1) 1465 || !h->def_regular)) 1466 || (bfd_link_pic (info) 1467 && ((! info->symbolic && h->dynindx != -1) 1468 || !h->def_regular) 1469 && ((input_section->flags & SEC_ALLOC) != 0 1470 /* DWARF will emit R_VAX_32 relocations in its 1471 sections against symbols defined externally 1472 in shared libraries. We can't do anything 1473 with them here. */ 1474 1475 || ((input_section->flags & SEC_DEBUGGING) != 0 1476 && h->def_dynamic)) 1477 && (r_type == R_VAX_8 1478 || r_type == R_VAX_16 1479 || r_type == R_VAX_32)))) 1480 /* In these cases, we don't need the relocation 1481 value. We check specially because in some 1482 obscure cases sec->output_section will be NULL. */ 1483 relocation = 0; 1484 } 1485 1486 if (sec != NULL && discarded_section (sec)) 1487 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1488 rel, 1, relend, howto, 0, contents); 1489 1490 if (bfd_link_relocatable (info)) 1491 continue; 1492 1493 switch (r_type) 1494 { 1495 case R_VAX_GOT32: 1496 /* Relocation is to the address of the entry for this symbol 1497 in the global offset table. */ 1498 1499 /* Resolve a GOTxx reloc against a local symbol directly, 1500 without using the global offset table. */ 1501 if (h == NULL 1502 || h->got.offset == (bfd_vma) -1) 1503 break; 1504 1505 { 1506 bfd_vma off; 1507 1508 if (sgot == NULL) 1509 { 1510 sgot = bfd_get_linker_section (dynobj, ".got"); 1511 BFD_ASSERT (sgot != NULL); 1512 } 1513 1514 off = h->got.offset; 1515 BFD_ASSERT (off < sgot->size); 1516 1517 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off); 1518 1519 relocation = sgot->output_offset + off; 1520 /* The GOT relocation uses the addend. */ 1521 rel->r_addend = 0; 1522 1523 /* Change the reference to be indirect. */ 1524 contents[rel->r_offset - 1] |= 0x10; 1525 relocation += sgot->output_section->vma; 1526 } 1527 break; 1528 1529 case R_VAX_PC32: 1530 /* If we are creating an executable and the function this 1531 reloc refers to is in a shared lib, then we made a PLT 1532 entry for this symbol and need to handle the reloc like 1533 a PLT reloc. */ 1534 if (bfd_link_pic (info)) 1535 goto r_vax_pc32_shared; 1536 /* Fall through. */ 1537 case R_VAX_PLT32: 1538 /* Relocation is to the entry for this symbol in the 1539 procedure linkage table. */ 1540 1541 /* Resolve a PLTxx reloc against a local symbol directly, 1542 without using the procedure linkage table. */ 1543 if (h == NULL 1544 || h->plt.offset == (bfd_vma) -1) 1545 break; 1546 1547 if (splt == NULL) 1548 { 1549 splt = bfd_get_linker_section (dynobj, ".plt"); 1550 BFD_ASSERT (splt != NULL); 1551 } 1552 1553 if (sgotplt == NULL) 1554 { 1555 sgotplt = bfd_get_linker_section (dynobj, ".got.plt"); 1556 BFD_ASSERT (sgotplt != NULL); 1557 } 1558 1559 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1560 1561 /* Get the offset into the .got table of the entry that 1562 corresponds to this function. Each .got entry is 4 bytes. 1563 The first two are reserved. */ 1564 got_offset = (plt_index + 3) * 4; 1565 1566 /* We want the relocation to point into the .got.plt instead 1567 of the plt itself. */ 1568 relocation = (sgotplt->output_section->vma 1569 + sgotplt->output_offset 1570 + got_offset); 1571 contents[rel->r_offset-1] |= 0x10; /* make indirect */ 1572 if (rel->r_addend == 2) 1573 { 1574 h->plt.offset |= 1; 1575 } 1576 else if (rel->r_addend != 0) 1577 (*_bfd_error_handler) 1578 (_("%s: warning: PLT addend of %d to `%s' from %s section ignored"), 1579 bfd_get_filename (input_bfd), rel->r_addend, 1580 h->root.root.string, 1581 bfd_get_section_name (input_bfd, input_section)); 1582 rel->r_addend = 0; 1583 1584 break; 1585 1586 case R_VAX_PC8: 1587 case R_VAX_PC16: 1588 r_vax_pc32_shared: 1589 if (h == NULL 1590 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1591 || h->forced_local) 1592 break; 1593 /* Fall through. */ 1594 case R_VAX_8: 1595 case R_VAX_16: 1596 case R_VAX_32: 1597 if (bfd_link_pic (info) 1598 && r_symndx != STN_UNDEF 1599 && (input_section->flags & SEC_ALLOC) != 0 1600 && ((r_type != R_VAX_PC8 1601 && r_type != R_VAX_PC16 1602 && r_type != R_VAX_PC32) 1603 || ((input_section->flags & SEC_CODE) 1604 && (!info->symbolic 1605 || (!h->def_regular && h->type != STT_SECTION))))) 1606 { 1607 Elf_Internal_Rela outrel; 1608 bfd_byte *loc; 1609 bfd_boolean skip, relocate; 1610 1611 /* When generating a shared object, these relocations 1612 are copied into the output file to be resolved at run 1613 time. */ 1614 if (sreloc == NULL) 1615 { 1616 sreloc = _bfd_elf_get_dynamic_reloc_section 1617 (input_bfd, input_section, /*rela?*/ TRUE); 1618 if (sreloc == NULL) 1619 return FALSE; 1620 } 1621 1622 skip = FALSE; 1623 relocate = FALSE; 1624 1625 outrel.r_offset = 1626 _bfd_elf_section_offset (output_bfd, info, input_section, 1627 rel->r_offset); 1628 if (outrel.r_offset == (bfd_vma) -1) 1629 skip = TRUE; 1630 if (outrel.r_offset == (bfd_vma) -2) 1631 skip = TRUE, relocate = TRUE; 1632 outrel.r_offset += (input_section->output_section->vma 1633 + input_section->output_offset); 1634 1635 if (skip) 1636 memset (&outrel, 0, sizeof outrel); 1637 /* h->dynindx may be -1 if the symbol was marked to 1638 become local. */ 1639 else if (h != NULL 1640 && ((! info->symbolic && h->dynindx != -1) 1641 || !h->def_regular)) 1642 { 1643 BFD_ASSERT (h->dynindx != -1); 1644 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1645 outrel.r_addend = relocation + rel->r_addend; 1646 } 1647 else 1648 { 1649 if (r_type == R_VAX_32) 1650 { 1651 relocate = TRUE; 1652 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE); 1653 outrel.r_addend = bfd_get_signed_32(input_bfd, 1654 &contents[rel->r_offset]) 1655 + relocation + rel->r_addend; 1656 } 1657 else 1658 { 1659 long indx; 1660 1661 if (bfd_is_abs_section (sec)) 1662 indx = 0; 1663 else if (sec == NULL || sec->owner == NULL) 1664 { 1665 bfd_set_error (bfd_error_bad_value); 1666 return FALSE; 1667 } 1668 else 1669 { 1670 asection *osec; 1671 1672 /* We are turning this relocation into one 1673 against a section symbol. It would be 1674 proper to subtract the symbol's value, 1675 osec->vma, from the emitted reloc addend, 1676 but ld.so expects buggy relocs. */ 1677 osec = sec->output_section; 1678 indx = elf_section_data (osec)->dynindx; 1679 if (indx == 0) 1680 { 1681 struct elf_link_hash_table *htab; 1682 htab = elf_hash_table (info); 1683 osec = htab->text_index_section; 1684 indx = elf_section_data (osec)->dynindx; 1685 } 1686 BFD_ASSERT (indx != 0); 1687 } 1688 1689 outrel.r_info = ELF32_R_INFO (indx, r_type); 1690 outrel.r_addend = relocation + rel->r_addend; 1691 } 1692 } 1693 1694 if (input_section->flags & SEC_CODE) 1695 info->flags |= DF_TEXTREL; 1696 1697 if ((input_section->flags & SEC_CODE) != 0 1698 || (ELF32_R_TYPE (outrel.r_info) != R_VAX_32 1699 && ELF32_R_TYPE (outrel.r_info) != R_VAX_RELATIVE 1700 && ELF32_R_TYPE (outrel.r_info) != R_VAX_COPY 1701 && ELF32_R_TYPE (outrel.r_info) != R_VAX_JMP_SLOT 1702 && ELF32_R_TYPE (outrel.r_info) != R_VAX_GLOB_DAT)) 1703 { 1704 if (h != NULL) 1705 (*_bfd_error_handler) 1706 (_("%s: warning: %s relocation against symbol `%s' from %s section"), 1707 bfd_get_filename (input_bfd), howto->name, 1708 h->root.root.string, 1709 bfd_get_section_name (input_bfd, input_section)); 1710 else 1711 (*_bfd_error_handler) 1712 (_("%s: warning: %s relocation to 0x%x from %s section"), 1713 bfd_get_filename (input_bfd), howto->name, 1714 outrel.r_addend, 1715 bfd_get_section_name (input_bfd, input_section)); 1716 } 1717 loc = sreloc->contents; 1718 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1719 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1720 1721 /* This reloc will be computed at runtime, so there's no 1722 need to do anything now, except for R_VAX_32 1723 relocations that have been turned into 1724 R_VAX_RELATIVE. */ 1725 if (!relocate) 1726 continue; 1727 } 1728 1729 break; 1730 1731 case R_VAX_GNU_VTINHERIT: 1732 case R_VAX_GNU_VTENTRY: 1733 /* These are no-ops in the end. */ 1734 continue; 1735 1736 default: 1737 break; 1738 } 1739 1740 /* VAX PCREL relocations are from the end of relocation, not the start. 1741 So subtract the difference from the relocation amount since we can't 1742 add it to the offset. */ 1743 if (howto->pc_relative && howto->pcrel_offset) 1744 relocation -= bfd_get_reloc_size(howto); 1745 1746 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1747 contents, rel->r_offset, 1748 relocation, rel->r_addend); 1749 1750 if (r != bfd_reloc_ok) 1751 { 1752 switch (r) 1753 { 1754 default: 1755 case bfd_reloc_outofrange: 1756 abort (); 1757 case bfd_reloc_overflow: 1758 { 1759 const char *name; 1760 1761 if (h != NULL) 1762 name = NULL; 1763 else 1764 { 1765 name = bfd_elf_string_from_elf_section (input_bfd, 1766 symtab_hdr->sh_link, 1767 sym->st_name); 1768 if (name == NULL) 1769 return FALSE; 1770 if (*name == '\0') 1771 name = bfd_section_name (input_bfd, sec); 1772 } 1773 info->callbacks->reloc_overflow 1774 (info, (h ? &h->root : NULL), name, howto->name, 1775 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 1776 } 1777 break; 1778 } 1779 } 1780 } 1781 1782 return TRUE; 1783 } 1784 1785 /* Finish up dynamic symbol handling. We set the contents of various 1786 dynamic sections here. */ 1787 1788 static bfd_boolean 1789 elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info, 1790 struct elf_link_hash_entry *h, 1791 Elf_Internal_Sym *sym) 1792 { 1793 bfd *dynobj; 1794 1795 dynobj = elf_hash_table (info)->dynobj; 1796 1797 if (h->plt.offset != (bfd_vma) -1) 1798 { 1799 asection *splt; 1800 asection *sgot; 1801 asection *srela; 1802 bfd_vma plt_index; 1803 bfd_vma got_offset; 1804 bfd_vma addend; 1805 Elf_Internal_Rela rela; 1806 bfd_byte *loc; 1807 1808 /* This symbol has an entry in the procedure linkage table. Set 1809 it up. */ 1810 BFD_ASSERT (h->dynindx != -1); 1811 1812 splt = bfd_get_linker_section (dynobj, ".plt"); 1813 sgot = bfd_get_linker_section (dynobj, ".got.plt"); 1814 srela = bfd_get_linker_section (dynobj, ".rela.plt"); 1815 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 1816 1817 addend = 2 * (h->plt.offset & 1); 1818 h->plt.offset &= ~1; 1819 1820 /* Get the index in the procedure linkage table which 1821 corresponds to this symbol. This is the index of this symbol 1822 in all the symbols for which we are making plt entries. The 1823 first entry in the procedure linkage table is reserved. */ 1824 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1825 1826 /* Get the offset into the .got table of the entry that 1827 corresponds to this function. Each .got entry is 4 bytes. 1828 The first two are reserved. */ 1829 got_offset = (plt_index + 3) * 4; 1830 1831 /* Fill in the entry in the procedure linkage table. */ 1832 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry, 1833 PLT_ENTRY_SIZE); 1834 1835 /* The offset is relative to the first extension word. */ 1836 bfd_put_32 (output_bfd, 1837 -(h->plt.offset + 8), 1838 splt->contents + h->plt.offset + 4); 1839 1840 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 1841 splt->contents + h->plt.offset + 8); 1842 1843 /* Fill in the entry in the global offset table. */ 1844 bfd_put_32 (output_bfd, 1845 (splt->output_section->vma 1846 + splt->output_offset 1847 + h->plt.offset) + addend, 1848 sgot->contents + got_offset); 1849 1850 /* Fill in the entry in the .rela.plt section. */ 1851 rela.r_offset = (sgot->output_section->vma 1852 + sgot->output_offset 1853 + got_offset); 1854 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT); 1855 rela.r_addend = addend; 1856 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 1857 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1858 1859 if (!h->def_regular) 1860 { 1861 /* Mark the symbol as undefined, rather than as defined in 1862 the .plt section. Leave the value alone. */ 1863 sym->st_shndx = SHN_UNDEF; 1864 } 1865 } 1866 1867 if (h->got.offset != (bfd_vma) -1) 1868 { 1869 asection *sgot; 1870 asection *srela; 1871 Elf_Internal_Rela rela; 1872 bfd_byte *loc; 1873 1874 /* This symbol has an entry in the global offset table. Set it 1875 up. */ 1876 sgot = bfd_get_linker_section (dynobj, ".got"); 1877 srela = bfd_get_linker_section (dynobj, ".rela.got"); 1878 BFD_ASSERT (sgot != NULL && srela != NULL); 1879 1880 rela.r_offset = (sgot->output_section->vma 1881 + sgot->output_offset 1882 + h->got.offset); 1883 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT); 1884 rela.r_addend = bfd_get_signed_32 (output_bfd, 1885 sgot->contents + h->got.offset); 1886 1887 loc = srela->contents; 1888 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 1889 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1890 } 1891 1892 if (h->needs_copy) 1893 { 1894 asection *s; 1895 Elf_Internal_Rela rela; 1896 bfd_byte *loc; 1897 1898 /* This symbol needs a copy reloc. Set it up. */ 1899 BFD_ASSERT (h->dynindx != -1 1900 && (h->root.type == bfd_link_hash_defined 1901 || h->root.type == bfd_link_hash_defweak)); 1902 1903 s = bfd_get_linker_section (dynobj, ".rela.bss"); 1904 BFD_ASSERT (s != NULL); 1905 1906 rela.r_offset = (h->root.u.def.value 1907 + h->root.u.def.section->output_section->vma 1908 + h->root.u.def.section->output_offset); 1909 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY); 1910 rela.r_addend = 0; 1911 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 1912 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1913 } 1914 1915 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 1916 if (h == elf_hash_table (info)->hdynamic 1917 || h == elf_hash_table (info)->hgot) 1918 sym->st_shndx = SHN_ABS; 1919 1920 return TRUE; 1921 } 1922 1923 /* Finish up the dynamic sections. */ 1924 1925 static bfd_boolean 1926 elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 1927 { 1928 bfd *dynobj; 1929 asection *sgot; 1930 asection *sdyn; 1931 1932 dynobj = elf_hash_table (info)->dynobj; 1933 1934 sgot = bfd_get_linker_section (dynobj, ".got.plt"); 1935 BFD_ASSERT (sgot != NULL); 1936 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 1937 1938 if (elf_hash_table (info)->dynamic_sections_created) 1939 { 1940 asection *splt; 1941 Elf32_External_Dyn *dyncon, *dynconend; 1942 1943 splt = bfd_get_linker_section (dynobj, ".plt"); 1944 BFD_ASSERT (splt != NULL && sdyn != NULL); 1945 1946 dyncon = (Elf32_External_Dyn *) sdyn->contents; 1947 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 1948 for (; dyncon < dynconend; dyncon++) 1949 { 1950 Elf_Internal_Dyn dyn; 1951 const char *name; 1952 asection *s; 1953 1954 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 1955 1956 switch (dyn.d_tag) 1957 { 1958 default: 1959 break; 1960 1961 case DT_PLTGOT: 1962 name = ".got.plt"; 1963 goto get_vma; 1964 case DT_JMPREL: 1965 name = ".rela.plt"; 1966 get_vma: 1967 s = bfd_get_linker_section (dynobj, name); 1968 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 1969 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1970 break; 1971 1972 case DT_PLTRELSZ: 1973 s = bfd_get_linker_section (dynobj, ".rela.plt"); 1974 dyn.d_un.d_val = s->size; 1975 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1976 break; 1977 1978 case DT_RELASZ: 1979 /* The procedure linkage table relocs (DT_JMPREL) should 1980 not be included in the overall relocs (DT_RELA). 1981 Therefore, we override the DT_RELASZ entry here to 1982 make it not include the JMPREL relocs. Since the 1983 linker script arranges for .rela.plt to follow all 1984 other relocation sections, we don't have to worry 1985 about changing the DT_RELA entry. */ 1986 s = bfd_get_linker_section (dynobj, ".rela.plt"); 1987 if (s != NULL) 1988 dyn.d_un.d_val -= s->size; 1989 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 1990 break; 1991 } 1992 } 1993 1994 /* Fill in the first entry in the procedure linkage table. */ 1995 if (splt->size > 0) 1996 { 1997 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE); 1998 bfd_put_32 (output_bfd, 1999 (sgot->output_section->vma 2000 + sgot->output_offset + 4 2001 - (splt->output_section->vma + 6)), 2002 splt->contents + 2); 2003 bfd_put_32 (output_bfd, 2004 (sgot->output_section->vma 2005 + sgot->output_offset + 8 2006 - (splt->output_section->vma + 12)), 2007 splt->contents + 8); 2008 elf_section_data (splt->output_section)->this_hdr.sh_entsize 2009 = PLT_ENTRY_SIZE; 2010 } 2011 } 2012 2013 /* Fill in the first three entries in the global offset table. */ 2014 if (sgot->size > 0) 2015 { 2016 if (sdyn == NULL) 2017 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 2018 else 2019 bfd_put_32 (output_bfd, 2020 sdyn->output_section->vma + sdyn->output_offset, 2021 sgot->contents); 2022 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 2023 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 2024 } 2025 2026 if (elf_section_data (sgot->output_section) != NULL) 2027 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2028 2029 return TRUE; 2030 } 2031 2032 static enum elf_reloc_type_class 2033 elf_vax_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, 2034 const asection *rel_sec ATTRIBUTE_UNUSED, 2035 const Elf_Internal_Rela *rela) 2036 { 2037 switch ((int) ELF32_R_TYPE (rela->r_info)) 2038 { 2039 case R_VAX_RELATIVE: 2040 return reloc_class_relative; 2041 case R_VAX_JMP_SLOT: 2042 return reloc_class_plt; 2043 case R_VAX_COPY: 2044 return reloc_class_copy; 2045 default: 2046 return reloc_class_normal; 2047 } 2048 } 2049 2050 static bfd_vma 2051 elf_vax_plt_sym_val (bfd_vma i, const asection *plt, 2052 const arelent *rel ATTRIBUTE_UNUSED) 2053 { 2054 return plt->vma + (i + 1) * PLT_ENTRY_SIZE; 2055 } 2056 2057 #define TARGET_LITTLE_SYM vax_elf32_vec 2058 #define TARGET_LITTLE_NAME "elf32-vax" 2059 #define ELF_MACHINE_CODE EM_VAX 2060 #define ELF_MAXPAGESIZE 0x10000 2061 2062 #define elf_backend_create_dynamic_sections \ 2063 _bfd_elf_create_dynamic_sections 2064 #define bfd_elf32_bfd_link_hash_table_create \ 2065 elf_vax_link_hash_table_create 2066 #define bfd_elf32_bfd_copy_private_bfd_data \ 2067 elf32_vax_copy_private_bfd_data 2068 2069 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link 2070 2071 #define elf_backend_check_relocs elf_vax_check_relocs 2072 #define elf_backend_adjust_dynamic_symbol \ 2073 elf_vax_adjust_dynamic_symbol 2074 #define elf_backend_always_size_sections \ 2075 elf_vax_always_size_sections 2076 #define elf_backend_size_dynamic_sections \ 2077 elf_vax_size_dynamic_sections 2078 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 2079 #define elf_backend_relocate_section elf_vax_relocate_section 2080 #define elf_backend_finish_dynamic_symbol \ 2081 elf_vax_finish_dynamic_symbol 2082 #define elf_backend_finish_dynamic_sections \ 2083 elf_vax_finish_dynamic_sections 2084 #define elf_backend_reloc_type_class elf_vax_reloc_type_class 2085 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook 2086 #define elf_backend_gc_sweep_hook elf_vax_gc_sweep_hook 2087 #define elf_backend_plt_sym_val elf_vax_plt_sym_val 2088 #define bfd_elf32_bfd_merge_private_bfd_data \ 2089 elf32_vax_merge_private_bfd_data 2090 #define bfd_elf32_bfd_set_private_flags \ 2091 elf32_vax_set_private_flags 2092 #define bfd_elf32_bfd_print_private_bfd_data \ 2093 elf32_vax_print_private_bfd_data 2094 2095 #define elf_backend_can_gc_sections 1 2096 #define elf_backend_want_got_plt 1 2097 #define elf_backend_plt_readonly 1 2098 #define elf_backend_want_plt_sym 0 2099 #define elf_backend_got_header_size 16 2100 #define elf_backend_rela_normal 1 2101 2102 #include "elf32-target.h" 2103