1 /* VAX series support for 32-bit ELF 2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 3 2004 Free Software Foundation, Inc. 4 Contributed by Matt Thomas <matt@3am-software.com>. 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 21 22 #include "bfd.h" 23 #include "sysdep.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 30 PARAMS ((bfd *, bfd_reloc_code_real_type)); 31 static void rtype_to_howto 32 PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); 33 static struct bfd_hash_entry *elf_vax_link_hash_newfunc 34 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); 35 static struct bfd_link_hash_table *elf_vax_link_hash_table_create 36 PARAMS ((bfd *)); 37 static bfd_boolean elf_vax_check_relocs 38 PARAMS ((bfd *, struct bfd_link_info *, asection *, 39 const Elf_Internal_Rela *)); 40 static asection *elf_vax_gc_mark_hook 41 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, 42 struct elf_link_hash_entry *, Elf_Internal_Sym *)); 43 static bfd_boolean elf_vax_gc_sweep_hook 44 PARAMS ((bfd *, struct bfd_link_info *, asection *, 45 const Elf_Internal_Rela *)); 46 static bfd_boolean elf_vax_adjust_dynamic_symbol 47 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); 48 static bfd_boolean elf_vax_size_dynamic_sections 49 PARAMS ((bfd *, struct bfd_link_info *)); 50 static bfd_boolean elf_vax_relocate_section 51 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 52 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); 53 static bfd_boolean elf_vax_finish_dynamic_symbol 54 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, 55 Elf_Internal_Sym *)); 56 static bfd_boolean elf_vax_finish_dynamic_sections 57 PARAMS ((bfd *, struct bfd_link_info *)); 58 59 static bfd_boolean elf32_vax_set_private_flags 60 PARAMS ((bfd *, flagword)); 61 static bfd_boolean elf32_vax_merge_private_bfd_data 62 PARAMS ((bfd *, bfd *)); 63 static bfd_boolean elf32_vax_print_private_bfd_data 64 PARAMS ((bfd *, PTR)); 65 66 static reloc_howto_type howto_table[] = { 67 HOWTO (R_VAX_NONE, /* type */ 68 0, /* rightshift */ 69 0, /* size (0 = byte, 1 = short, 2 = long) */ 70 0, /* bitsize */ 71 FALSE, /* pc_relative */ 72 0, /* bitpos */ 73 complain_overflow_dont, /* complain_on_overflow */ 74 bfd_elf_generic_reloc, /* special_function */ 75 "R_VAX_NONE", /* name */ 76 FALSE, /* partial_inplace */ 77 0, /* src_mask */ 78 0x00000000, /* dst_mask */ 79 FALSE), /* pcrel_offset */ 80 81 HOWTO (R_VAX_32, /* type */ 82 0, /* rightshift */ 83 2, /* size (0 = byte, 1 = short, 2 = long) */ 84 32, /* bitsize */ 85 FALSE, /* pc_relative */ 86 0, /* bitpos */ 87 complain_overflow_bitfield, /* complain_on_overflow */ 88 bfd_elf_generic_reloc, /* special_function */ 89 "R_VAX_32", /* name */ 90 FALSE, /* partial_inplace */ 91 0, /* src_mask */ 92 0xffffffff, /* dst_mask */ 93 FALSE), /* pcrel_offset */ 94 95 HOWTO (R_VAX_16, /* type */ 96 0, /* rightshift */ 97 1, /* size (0 = byte, 1 = short, 2 = long) */ 98 16, /* bitsize */ 99 FALSE, /* pc_relative */ 100 0, /* bitpos */ 101 complain_overflow_bitfield, /* complain_on_overflow */ 102 bfd_elf_generic_reloc, /* special_function */ 103 "R_VAX_16", /* name */ 104 FALSE, /* partial_inplace */ 105 0, /* src_mask */ 106 0x0000ffff, /* dst_mask */ 107 FALSE), /* pcrel_offset */ 108 109 HOWTO (R_VAX_8, /* type */ 110 0, /* rightshift */ 111 0, /* size (0 = byte, 1 = short, 2 = long) */ 112 8, /* bitsize */ 113 FALSE, /* pc_relative */ 114 0, /* bitpos */ 115 complain_overflow_bitfield, /* complain_on_overflow */ 116 bfd_elf_generic_reloc, /* special_function */ 117 "R_VAX_8", /* name */ 118 FALSE, /* partial_inplace */ 119 0, /* src_mask */ 120 0x000000ff, /* dst_mask */ 121 FALSE), /* pcrel_offset */ 122 123 HOWTO (R_VAX_PC32, /* type */ 124 0, /* rightshift */ 125 2, /* size (0 = byte, 1 = short, 2 = long) */ 126 32, /* bitsize */ 127 TRUE, /* pc_relative */ 128 0, /* bitpos */ 129 complain_overflow_bitfield, /* complain_on_overflow */ 130 bfd_elf_generic_reloc, /* special_function */ 131 "R_VAX_PC32", /* name */ 132 FALSE, /* partial_inplace */ 133 0, /* src_mask */ 134 0xffffffff, /* dst_mask */ 135 TRUE), /* pcrel_offset */ 136 137 HOWTO (R_VAX_PC16, /* type */ 138 0, /* rightshift */ 139 1, /* size (0 = byte, 1 = short, 2 = long) */ 140 16, /* bitsize */ 141 TRUE, /* pc_relative */ 142 0, /* bitpos */ 143 complain_overflow_signed, /* complain_on_overflow */ 144 bfd_elf_generic_reloc, /* special_function */ 145 "R_VAX_PC16", /* name */ 146 FALSE, /* partial_inplace */ 147 0, /* src_mask */ 148 0x0000ffff, /* dst_mask */ 149 TRUE), /* pcrel_offset */ 150 151 HOWTO (R_VAX_PC8, /* type */ 152 0, /* rightshift */ 153 0, /* size (0 = byte, 1 = short, 2 = long) */ 154 8, /* bitsize */ 155 TRUE, /* pc_relative */ 156 0, /* bitpos */ 157 complain_overflow_signed, /* complain_on_overflow */ 158 bfd_elf_generic_reloc, /* special_function */ 159 "R_VAX_PC8", /* name */ 160 FALSE, /* partial_inplace */ 161 0, /* src_mask */ 162 0x000000ff, /* dst_mask */ 163 TRUE), /* pcrel_offset */ 164 165 HOWTO (R_VAX_GOT32, /* type */ 166 0, /* rightshift */ 167 2, /* size (0 = byte, 1 = short, 2 = long) */ 168 32, /* bitsize */ 169 TRUE, /* pc_relative */ 170 0, /* bitpos */ 171 complain_overflow_bitfield, /* complain_on_overflow */ 172 bfd_elf_generic_reloc, /* special_function */ 173 "R_VAX_GOT32", /* name */ 174 FALSE, /* partial_inplace */ 175 0, /* src_mask */ 176 0xffffffff, /* dst_mask */ 177 TRUE), /* pcrel_offset */ 178 179 EMPTY_HOWTO (-1), 180 EMPTY_HOWTO (-1), 181 EMPTY_HOWTO (-1), 182 EMPTY_HOWTO (-1), 183 EMPTY_HOWTO (-1), 184 185 HOWTO (R_VAX_PLT32, /* type */ 186 0, /* rightshift */ 187 2, /* size (0 = byte, 1 = short, 2 = long) */ 188 32, /* bitsize */ 189 TRUE, /* pc_relative */ 190 0, /* bitpos */ 191 complain_overflow_bitfield, /* complain_on_overflow */ 192 bfd_elf_generic_reloc, /* special_function */ 193 "R_VAX_PLT32", /* name */ 194 FALSE, /* partial_inplace */ 195 0, /* src_mask */ 196 0xffffffff, /* dst_mask */ 197 TRUE), /* pcrel_offset */ 198 199 EMPTY_HOWTO (-1), 200 EMPTY_HOWTO (-1), 201 EMPTY_HOWTO (-1), 202 EMPTY_HOWTO (-1), 203 EMPTY_HOWTO (-1), 204 205 HOWTO (R_VAX_COPY, /* type */ 206 0, /* rightshift */ 207 0, /* size (0 = byte, 1 = short, 2 = long) */ 208 0, /* bitsize */ 209 FALSE, /* pc_relative */ 210 0, /* bitpos */ 211 complain_overflow_dont, /* complain_on_overflow */ 212 bfd_elf_generic_reloc, /* special_function */ 213 "R_VAX_COPY", /* name */ 214 FALSE, /* partial_inplace */ 215 0, /* src_mask */ 216 0xffffffff, /* dst_mask */ 217 FALSE), /* pcrel_offset */ 218 219 HOWTO (R_VAX_GLOB_DAT, /* type */ 220 0, /* rightshift */ 221 2, /* size (0 = byte, 1 = short, 2 = long) */ 222 32, /* bitsize */ 223 FALSE, /* pc_relative */ 224 0, /* bitpos */ 225 complain_overflow_dont, /* complain_on_overflow */ 226 bfd_elf_generic_reloc, /* special_function */ 227 "R_VAX_GLOB_DAT", /* name */ 228 FALSE, /* partial_inplace */ 229 0, /* src_mask */ 230 0xffffffff, /* dst_mask */ 231 FALSE), /* pcrel_offset */ 232 233 HOWTO (R_VAX_JMP_SLOT, /* type */ 234 0, /* rightshift */ 235 2, /* size (0 = byte, 1 = short, 2 = long) */ 236 32, /* bitsize */ 237 FALSE, /* pc_relative */ 238 0, /* bitpos */ 239 complain_overflow_dont, /* complain_on_overflow */ 240 bfd_elf_generic_reloc, /* special_function */ 241 "R_VAX_JMP_SLOT", /* name */ 242 FALSE, /* partial_inplace */ 243 0, /* src_mask */ 244 0xffffffff, /* dst_mask */ 245 FALSE), /* pcrel_offset */ 246 247 HOWTO (R_VAX_RELATIVE, /* type */ 248 0, /* rightshift */ 249 2, /* size (0 = byte, 1 = short, 2 = long) */ 250 32, /* bitsize */ 251 FALSE, /* pc_relative */ 252 0, /* bitpos */ 253 complain_overflow_dont, /* complain_on_overflow */ 254 bfd_elf_generic_reloc, /* special_function */ 255 "R_VAX_RELATIVE", /* name */ 256 FALSE, /* partial_inplace */ 257 0, /* src_mask */ 258 0xffffffff, /* dst_mask */ 259 FALSE), /* pcrel_offset */ 260 261 /* GNU extension to record C++ vtable hierarchy */ 262 HOWTO (R_VAX_GNU_VTINHERIT, /* type */ 263 0, /* rightshift */ 264 2, /* size (0 = byte, 1 = short, 2 = long) */ 265 0, /* bitsize */ 266 FALSE, /* pc_relative */ 267 0, /* bitpos */ 268 complain_overflow_dont, /* complain_on_overflow */ 269 NULL, /* special_function */ 270 "R_VAX_GNU_VTINHERIT", /* name */ 271 FALSE, /* partial_inplace */ 272 0, /* src_mask */ 273 0, /* dst_mask */ 274 FALSE), /* pcrel_offset */ 275 276 /* GNU extension to record C++ vtable member usage */ 277 HOWTO (R_VAX_GNU_VTENTRY, /* type */ 278 0, /* rightshift */ 279 2, /* size (0 = byte, 1 = short, 2 = long) */ 280 0, /* bitsize */ 281 FALSE, /* pc_relative */ 282 0, /* bitpos */ 283 complain_overflow_dont, /* complain_on_overflow */ 284 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 285 "R_VAX_GNU_VTENTRY", /* name */ 286 FALSE, /* partial_inplace */ 287 0, /* src_mask */ 288 0, /* dst_mask */ 289 FALSE), /* pcrel_offset */ 290 }; 291 292 static void 293 rtype_to_howto (abfd, cache_ptr, dst) 294 bfd *abfd ATTRIBUTE_UNUSED; 295 arelent *cache_ptr; 296 Elf_Internal_Rela *dst; 297 { 298 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_VAX_max); 299 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)]; 300 } 301 302 #define elf_info_to_howto rtype_to_howto 303 304 static const struct 305 { 306 bfd_reloc_code_real_type bfd_val; 307 int elf_val; 308 } reloc_map[] = { 309 { BFD_RELOC_NONE, R_VAX_NONE }, 310 { BFD_RELOC_32, R_VAX_32 }, 311 { BFD_RELOC_16, R_VAX_16 }, 312 { BFD_RELOC_8, R_VAX_8 }, 313 { BFD_RELOC_32_PCREL, R_VAX_PC32 }, 314 { BFD_RELOC_16_PCREL, R_VAX_PC16 }, 315 { BFD_RELOC_8_PCREL, R_VAX_PC8 }, 316 { BFD_RELOC_32_GOT_PCREL, R_VAX_GOT32 }, 317 { BFD_RELOC_32_PLT_PCREL, R_VAX_PLT32 }, 318 { BFD_RELOC_NONE, R_VAX_COPY }, 319 { BFD_RELOC_VAX_GLOB_DAT, R_VAX_GLOB_DAT }, 320 { BFD_RELOC_VAX_JMP_SLOT, R_VAX_JMP_SLOT }, 321 { BFD_RELOC_VAX_RELATIVE, R_VAX_RELATIVE }, 322 { BFD_RELOC_CTOR, R_VAX_32 }, 323 { BFD_RELOC_VTABLE_INHERIT, R_VAX_GNU_VTINHERIT }, 324 { BFD_RELOC_VTABLE_ENTRY, R_VAX_GNU_VTENTRY }, 325 }; 326 327 static reloc_howto_type * 328 reloc_type_lookup (abfd, code) 329 bfd *abfd ATTRIBUTE_UNUSED; 330 bfd_reloc_code_real_type code; 331 { 332 unsigned int i; 333 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) 334 { 335 if (reloc_map[i].bfd_val == code) 336 return &howto_table[reloc_map[i].elf_val]; 337 } 338 return 0; 339 } 340 341 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup 342 #define ELF_ARCH bfd_arch_vax 343 /* end code generated by elf.el */ 344 345 /* Functions for the VAX ELF linker. */ 346 347 /* The name of the dynamic interpreter. This is put in the .interp 348 section. */ 349 350 #define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so" 351 352 /* The size in bytes of an entry in the procedure linkage table. */ 353 354 #define PLT_ENTRY_SIZE 12 355 356 /* The first entry in a procedure linkage table looks like this. See 357 the SVR4 ABI VAX supplement to see how this works. */ 358 359 static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] = 360 { 361 0xdd, 0xef, /* pushl l^ */ 362 0, 0, 0, 0, /* offset to .plt.got + 4 */ 363 0x17, 0xff, /* jmp @L^(pc) */ 364 0, 0, 0, 0, /* offset to .plt.got + 8 */ 365 }; 366 367 /* Subsequent entries in a procedure linkage table look like this. */ 368 369 static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] = 370 { 371 0x40, 0x00, /* .word ^M<r6> */ 372 0x16, 0xef, /* jsb L^(pc) */ 373 0, 0, 0, 0, /* replaced with offset to start of .plt */ 374 0, 0, 0, 0, /* index into .rela.plt */ 375 }; 376 377 /* The VAX linker needs to keep track of the number of relocs that it 378 decides to copy in check_relocs for each symbol. This is so that it 379 can discard PC relative relocs if it doesn't need them when linking 380 with -Bsymbolic. We store the information in a field extending the 381 regular ELF linker hash table. */ 382 383 /* This structure keeps track of the number of PC relative relocs we have 384 copied for a given symbol. */ 385 386 struct elf_vax_pcrel_relocs_copied 387 { 388 /* Next section. */ 389 struct elf_vax_pcrel_relocs_copied *next; 390 /* A section in dynobj. */ 391 asection *section; 392 /* Number of relocs copied in this section. */ 393 bfd_size_type count; 394 }; 395 396 /* VAX ELF linker hash entry. */ 397 398 struct elf_vax_link_hash_entry 399 { 400 struct elf_link_hash_entry root; 401 402 /* Number of PC relative relocs copied for this symbol. */ 403 struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied; 404 405 bfd_vma got_addend; 406 }; 407 408 /* VAX ELF linker hash table. */ 409 410 struct elf_vax_link_hash_table 411 { 412 struct elf_link_hash_table root; 413 }; 414 415 /* Declare this now that the above structures are defined. */ 416 417 static bfd_boolean elf_vax_discard_copies 418 PARAMS ((struct elf_vax_link_hash_entry *, PTR)); 419 420 /* Declare this now that the above structures are defined. */ 421 422 static bfd_boolean elf_vax_instantiate_got_entries 423 PARAMS ((struct elf_link_hash_entry *, PTR)); 424 425 /* Traverse an VAX ELF linker hash table. */ 426 427 #define elf_vax_link_hash_traverse(table, func, info) \ 428 (elf_link_hash_traverse \ 429 (&(table)->root, \ 430 (bfd_boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ 431 (info))) 432 433 /* Get the VAX ELF linker hash table from a link_info structure. */ 434 435 #define elf_vax_hash_table(p) \ 436 ((struct elf_vax_link_hash_table *) (p)->hash) 437 438 /* Create an entry in an VAX ELF linker hash table. */ 439 440 static struct bfd_hash_entry * 441 elf_vax_link_hash_newfunc (entry, table, string) 442 struct bfd_hash_entry *entry; 443 struct bfd_hash_table *table; 444 const char *string; 445 { 446 struct elf_vax_link_hash_entry *ret = 447 (struct elf_vax_link_hash_entry *) entry; 448 449 /* Allocate the structure if it has not already been allocated by a 450 subclass. */ 451 if (ret == (struct elf_vax_link_hash_entry *) NULL) 452 ret = ((struct elf_vax_link_hash_entry *) 453 bfd_hash_allocate (table, 454 sizeof (struct elf_vax_link_hash_entry))); 455 if (ret == (struct elf_vax_link_hash_entry *) NULL) 456 return (struct bfd_hash_entry *) ret; 457 458 /* Call the allocation method of the superclass. */ 459 ret = ((struct elf_vax_link_hash_entry *) 460 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 461 table, string)); 462 if (ret != (struct elf_vax_link_hash_entry *) NULL) 463 { 464 ret->pcrel_relocs_copied = NULL; 465 } 466 467 return (struct bfd_hash_entry *) ret; 468 } 469 470 /* Create an VAX ELF linker hash table. */ 471 472 static struct bfd_link_hash_table * 473 elf_vax_link_hash_table_create (abfd) 474 bfd *abfd; 475 { 476 struct elf_vax_link_hash_table *ret; 477 bfd_size_type amt = sizeof (struct elf_vax_link_hash_table); 478 479 ret = (struct elf_vax_link_hash_table *) bfd_malloc (amt); 480 if (ret == (struct elf_vax_link_hash_table *) NULL) 481 return NULL; 482 483 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, 484 elf_vax_link_hash_newfunc)) 485 { 486 free (ret); 487 return NULL; 488 } 489 490 return &ret->root.root; 491 } 492 493 /* Keep vax-specific flags in the ELF header */ 494 static bfd_boolean 495 elf32_vax_set_private_flags (abfd, flags) 496 bfd *abfd; 497 flagword flags; 498 { 499 elf_elfheader (abfd)->e_flags = flags; 500 elf_flags_init (abfd) = TRUE; 501 return TRUE; 502 } 503 504 /* Merge backend specific data from an object file to the output 505 object file when linking. */ 506 static bfd_boolean 507 elf32_vax_merge_private_bfd_data (ibfd, obfd) 508 bfd *ibfd; 509 bfd *obfd; 510 { 511 flagword out_flags; 512 flagword in_flags; 513 514 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 515 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 516 return TRUE; 517 518 in_flags = elf_elfheader (ibfd)->e_flags; 519 out_flags = elf_elfheader (obfd)->e_flags; 520 521 if (!elf_flags_init (obfd)) 522 { 523 elf_flags_init (obfd) = TRUE; 524 elf_elfheader (obfd)->e_flags = in_flags; 525 } 526 527 return TRUE; 528 } 529 530 /* Display the flags field */ 531 static bfd_boolean 532 elf32_vax_print_private_bfd_data (abfd, ptr) 533 bfd *abfd; 534 PTR ptr; 535 { 536 FILE *file = (FILE *) ptr; 537 538 BFD_ASSERT (abfd != NULL && ptr != NULL); 539 540 /* Print normal ELF private data. */ 541 _bfd_elf_print_private_bfd_data (abfd, ptr); 542 543 /* Ignore init flag - it may not be set, despite the flags field containing valid data. */ 544 545 /* xgettext:c-format */ 546 fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); 547 548 if (elf_elfheader (abfd)->e_flags & EF_VAX_NONPIC) 549 fprintf (file, _(" [nonpic]")); 550 551 if (elf_elfheader (abfd)->e_flags & EF_VAX_DFLOAT) 552 fprintf (file, _(" [d-float]")); 553 554 if (elf_elfheader (abfd)->e_flags & EF_VAX_GFLOAT) 555 fprintf (file, _(" [g-float]")); 556 557 fputc ('\n', file); 558 559 return TRUE; 560 } 561 /* Look through the relocs for a section during the first phase, and 562 allocate space in the global offset table or procedure linkage 563 table. */ 564 565 static bfd_boolean 566 elf_vax_check_relocs (abfd, info, sec, relocs) 567 bfd *abfd; 568 struct bfd_link_info *info; 569 asection *sec; 570 const Elf_Internal_Rela *relocs; 571 { 572 bfd *dynobj; 573 Elf_Internal_Shdr *symtab_hdr; 574 struct elf_link_hash_entry **sym_hashes; 575 const Elf_Internal_Rela *rel; 576 const Elf_Internal_Rela *rel_end; 577 asection *sgot; 578 asection *srelgot; 579 asection *sreloc; 580 581 if (info->relocatable) 582 return TRUE; 583 584 dynobj = elf_hash_table (info)->dynobj; 585 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 586 sym_hashes = elf_sym_hashes (abfd); 587 588 sgot = NULL; 589 srelgot = NULL; 590 sreloc = NULL; 591 592 rel_end = relocs + sec->reloc_count; 593 for (rel = relocs; rel < rel_end; rel++) 594 { 595 unsigned long r_symndx; 596 struct elf_link_hash_entry *h; 597 598 r_symndx = ELF32_R_SYM (rel->r_info); 599 600 if (r_symndx < symtab_hdr->sh_info) 601 h = NULL; 602 else 603 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 604 605 switch (ELF32_R_TYPE (rel->r_info)) 606 { 607 case R_VAX_GOT32: 608 if (h != NULL 609 && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 610 break; 611 612 /* This symbol requires a global offset table entry. */ 613 614 if (dynobj == NULL) 615 { 616 /* Create the .got section. */ 617 elf_hash_table (info)->dynobj = dynobj = abfd; 618 if (!_bfd_elf_create_got_section (dynobj, info)) 619 return FALSE; 620 } 621 622 if (sgot == NULL) 623 { 624 sgot = bfd_get_section_by_name (dynobj, ".got"); 625 BFD_ASSERT (sgot != NULL); 626 } 627 628 if (srelgot == NULL 629 && (h != NULL || info->shared)) 630 { 631 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 632 if (srelgot == NULL) 633 { 634 srelgot = bfd_make_section (dynobj, ".rela.got"); 635 if (srelgot == NULL 636 || !bfd_set_section_flags (dynobj, srelgot, 637 (SEC_ALLOC 638 | SEC_LOAD 639 | SEC_HAS_CONTENTS 640 | SEC_IN_MEMORY 641 | SEC_LINKER_CREATED 642 | SEC_READONLY)) 643 || !bfd_set_section_alignment (dynobj, srelgot, 2)) 644 return FALSE; 645 } 646 } 647 648 if (h != NULL) 649 { 650 struct elf_vax_link_hash_entry *eh; 651 652 eh = (struct elf_vax_link_hash_entry *) h; 653 if (h->got.refcount == -1) 654 { 655 h->got.refcount = 1; 656 eh->got_addend = rel->r_addend; 657 } 658 else 659 { 660 h->got.refcount++; 661 if (eh->got_addend != (bfd_vma) rel->r_addend) 662 (*_bfd_error_handler) 663 (_("%s: warning: GOT addend of %ld to `%s' does not match previous GOT addend of %ld"), 664 bfd_get_filename (abfd), rel->r_addend, 665 h->root.root.string, 666 eh->got_addend); 667 668 } 669 } 670 break; 671 672 case R_VAX_PLT32: 673 /* This symbol requires a procedure linkage table entry. We 674 actually build the entry in adjust_dynamic_symbol, 675 because this might be a case of linking PIC code which is 676 never referenced by a dynamic object, in which case we 677 don't need to generate a procedure linkage table entry 678 after all. */ 679 680 /* If this is a local symbol, we resolve it directly without 681 creating a procedure linkage table entry. */ 682 if (h == NULL) 683 continue; 684 685 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; 686 if (h->plt.refcount == -1) 687 h->plt.refcount = 1; 688 else 689 h->plt.refcount++; 690 break; 691 692 case R_VAX_PC8: 693 case R_VAX_PC16: 694 case R_VAX_PC32: 695 /* If we are creating a shared library and this is not a local 696 symbol, we need to copy the reloc into the shared library. 697 However when linking with -Bsymbolic and this is a global 698 symbol which is defined in an object we are including in the 699 link (i.e., DEF_REGULAR is set), then we can resolve the 700 reloc directly. At this point we have not seen all the input 701 files, so it is possible that DEF_REGULAR is not set now but 702 will be set later (it is never cleared). We account for that 703 possibility below by storing information in the 704 pcrel_relocs_copied field of the hash table entry. */ 705 if (!(info->shared 706 && (sec->flags & SEC_ALLOC) != 0 707 && h != NULL 708 && (!info->symbolic 709 || (h->elf_link_hash_flags 710 & ELF_LINK_HASH_DEF_REGULAR) == 0))) 711 { 712 if (h != NULL) 713 { 714 /* Make sure a plt entry is created for this symbol if 715 it turns out to be a function defined by a dynamic 716 object. */ 717 if (h->plt.refcount == -1) 718 h->plt.refcount = 1; 719 else 720 h->plt.refcount++; 721 } 722 break; 723 } 724 /* Fall through. */ 725 case R_VAX_8: 726 case R_VAX_16: 727 case R_VAX_32: 728 if (h != NULL) 729 { 730 /* Make sure a plt entry is created for this symbol if it 731 turns out to be a function defined by a dynamic object. */ 732 if (h->plt.refcount == -1) 733 h->plt.refcount = 1; 734 else 735 h->plt.refcount++; 736 } 737 738 /* If we are creating a shared library, we need to copy the 739 reloc into the shared library. */ 740 if (info->shared 741 && (sec->flags & SEC_ALLOC) != 0) 742 { 743 /* When creating a shared object, we must copy these 744 reloc types into the output file. We create a reloc 745 section in dynobj and make room for this reloc. */ 746 if (sreloc == NULL) 747 { 748 const char *name; 749 750 name = (bfd_elf_string_from_elf_section 751 (abfd, 752 elf_elfheader (abfd)->e_shstrndx, 753 elf_section_data (sec)->rel_hdr.sh_name)); 754 if (name == NULL) 755 return FALSE; 756 757 BFD_ASSERT (strncmp (name, ".rela", 5) == 0 758 && strcmp (bfd_get_section_name (abfd, sec), 759 name + 5) == 0); 760 761 sreloc = bfd_get_section_by_name (dynobj, name); 762 if (sreloc == NULL) 763 { 764 sreloc = bfd_make_section (dynobj, name); 765 if (sreloc == NULL 766 || !bfd_set_section_flags (dynobj, sreloc, 767 (SEC_ALLOC 768 | SEC_LOAD 769 | SEC_HAS_CONTENTS 770 | SEC_IN_MEMORY 771 | SEC_LINKER_CREATED 772 | SEC_READONLY)) 773 || !bfd_set_section_alignment (dynobj, sreloc, 2)) 774 return FALSE; 775 } 776 if (sec->flags & SEC_READONLY) 777 info->flags |= DF_TEXTREL; 778 } 779 780 sreloc->_raw_size += sizeof (Elf32_External_Rela); 781 782 /* If we are linking with -Bsymbolic, we count the number of 783 PC relative relocations we have entered for this symbol, 784 so that we can discard them again if the symbol is later 785 defined by a regular object. Note that this function is 786 only called if we are using a vaxelf linker hash table, 787 which means that h is really a pointer to an 788 elf_vax_link_hash_entry. */ 789 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8 790 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16 791 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32) 792 && info->symbolic) 793 { 794 struct elf_vax_link_hash_entry *eh; 795 struct elf_vax_pcrel_relocs_copied *p; 796 797 eh = (struct elf_vax_link_hash_entry *) h; 798 799 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) 800 if (p->section == sreloc) 801 break; 802 803 if (p == NULL) 804 { 805 p = ((struct elf_vax_pcrel_relocs_copied *) 806 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 807 if (p == NULL) 808 return FALSE; 809 p->next = eh->pcrel_relocs_copied; 810 eh->pcrel_relocs_copied = p; 811 p->section = sreloc; 812 p->count = 0; 813 } 814 815 ++p->count; 816 } 817 } 818 819 break; 820 821 /* This relocation describes the C++ object vtable hierarchy. 822 Reconstruct it for later use during GC. */ 823 case R_VAX_GNU_VTINHERIT: 824 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 825 return FALSE; 826 break; 827 828 /* This relocation describes which C++ vtable entries are actually 829 used. Record for later use during GC. */ 830 case R_VAX_GNU_VTENTRY: 831 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 832 return FALSE; 833 break; 834 835 default: 836 break; 837 } 838 } 839 840 return TRUE; 841 } 842 843 /* Return the section that should be marked against GC for a given 844 relocation. */ 845 846 static asection * 847 elf_vax_gc_mark_hook (sec, info, rel, h, sym) 848 asection *sec; 849 struct bfd_link_info *info ATTRIBUTE_UNUSED; 850 Elf_Internal_Rela *rel; 851 struct elf_link_hash_entry *h; 852 Elf_Internal_Sym *sym; 853 { 854 if (h != NULL) 855 { 856 switch (ELF32_R_TYPE (rel->r_info)) 857 { 858 case R_VAX_GNU_VTINHERIT: 859 case R_VAX_GNU_VTENTRY: 860 break; 861 862 default: 863 switch (h->root.type) 864 { 865 default: 866 break; 867 868 case bfd_link_hash_defined: 869 case bfd_link_hash_defweak: 870 return h->root.u.def.section; 871 872 case bfd_link_hash_common: 873 return h->root.u.c.p->section; 874 } 875 } 876 } 877 else 878 return bfd_section_from_elf_index (sec->owner, sym->st_shndx); 879 880 return NULL; 881 } 882 883 /* Update the got entry reference counts for the section being removed. */ 884 885 static bfd_boolean 886 elf_vax_gc_sweep_hook (abfd, info, sec, relocs) 887 bfd *abfd; 888 struct bfd_link_info *info; 889 asection *sec; 890 const Elf_Internal_Rela *relocs; 891 { 892 Elf_Internal_Shdr *symtab_hdr; 893 struct elf_link_hash_entry **sym_hashes; 894 const Elf_Internal_Rela *rel, *relend; 895 bfd *dynobj; 896 897 dynobj = elf_hash_table (info)->dynobj; 898 if (dynobj == NULL) 899 return TRUE; 900 901 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 902 sym_hashes = elf_sym_hashes (abfd); 903 904 relend = relocs + sec->reloc_count; 905 for (rel = relocs; rel < relend; rel++) 906 { 907 unsigned long r_symndx; 908 struct elf_link_hash_entry *h; 909 910 switch (ELF32_R_TYPE (rel->r_info)) 911 { 912 case R_VAX_GOT32: 913 r_symndx = ELF32_R_SYM (rel->r_info); 914 if (r_symndx >= symtab_hdr->sh_info) 915 { 916 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 917 if (h->got.refcount > 0) 918 --h->got.refcount; 919 } 920 break; 921 922 case R_VAX_PLT32: 923 case R_VAX_PC8: 924 case R_VAX_PC16: 925 case R_VAX_PC32: 926 case R_VAX_8: 927 case R_VAX_16: 928 case R_VAX_32: 929 r_symndx = ELF32_R_SYM (rel->r_info); 930 if (r_symndx >= symtab_hdr->sh_info) 931 { 932 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 933 if (h->plt.refcount > 0) 934 --h->plt.refcount; 935 } 936 break; 937 938 default: 939 break; 940 } 941 } 942 943 return TRUE; 944 } 945 946 /* Adjust a symbol defined by a dynamic object and referenced by a 947 regular object. The current definition is in some section of the 948 dynamic object, but we're not including those sections. We have to 949 change the definition to something the rest of the link can 950 understand. */ 951 952 static bfd_boolean 953 elf_vax_adjust_dynamic_symbol (info, h) 954 struct bfd_link_info *info; 955 struct elf_link_hash_entry *h; 956 { 957 bfd *dynobj; 958 asection *s; 959 unsigned int power_of_two; 960 961 dynobj = elf_hash_table (info)->dynobj; 962 963 /* Make sure we know what is going on here. */ 964 BFD_ASSERT (dynobj != NULL 965 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) 966 || h->weakdef != NULL 967 || ((h->elf_link_hash_flags 968 & ELF_LINK_HASH_DEF_DYNAMIC) != 0 969 && (h->elf_link_hash_flags 970 & ELF_LINK_HASH_REF_REGULAR) != 0 971 && (h->elf_link_hash_flags 972 & ELF_LINK_HASH_DEF_REGULAR) == 0))); 973 974 /* If this is a function, put it in the procedure linkage table. We 975 will fill in the contents of the procedure linkage table later, 976 when we know the address of the .got section. */ 977 if (h->type == STT_FUNC 978 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) 979 { 980 if (! info->shared 981 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 982 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 983 /* We must always create the plt entry if it was referenced 984 by a PLTxxO relocation. In this case we already recorded 985 it as a dynamic symbol. */ 986 && h->dynindx == -1) 987 { 988 /* This case can occur if we saw a PLTxx reloc in an input 989 file, but the symbol was never referred to by a dynamic 990 object. In such a case, we don't actually need to build 991 a procedure linkage table, and we can just do a PCxx 992 reloc instead. */ 993 BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); 994 h->plt.offset = (bfd_vma) -1; 995 return TRUE; 996 } 997 998 /* GC may have rendered this entry unused. */ 999 if (h->plt.refcount <= 0) 1000 { 1001 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 1002 h->plt.offset = (bfd_vma) -1; 1003 return TRUE; 1004 } 1005 1006 /* Make sure this symbol is output as a dynamic symbol. */ 1007 if (h->dynindx == -1) 1008 { 1009 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1010 return FALSE; 1011 } 1012 1013 s = bfd_get_section_by_name (dynobj, ".plt"); 1014 BFD_ASSERT (s != NULL); 1015 1016 /* If this is the first .plt entry, make room for the special 1017 first entry. */ 1018 if (s->_raw_size == 0) 1019 { 1020 s->_raw_size += PLT_ENTRY_SIZE; 1021 } 1022 1023 /* If this symbol is not defined in a regular file, and we are 1024 not generating a shared library, then set the symbol to this 1025 location in the .plt. This is required to make function 1026 pointers compare as equal between the normal executable and 1027 the shared library. */ 1028 if (!info->shared 1029 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 1030 { 1031 h->root.u.def.section = s; 1032 h->root.u.def.value = s->_raw_size; 1033 } 1034 1035 h->plt.offset = s->_raw_size; 1036 1037 /* Make room for this entry. */ 1038 s->_raw_size += PLT_ENTRY_SIZE; 1039 1040 /* We also need to make an entry in the .got.plt section, which 1041 will be placed in the .got section by the linker script. */ 1042 1043 s = bfd_get_section_by_name (dynobj, ".got.plt"); 1044 BFD_ASSERT (s != NULL); 1045 s->_raw_size += 4; 1046 1047 /* We also need to make an entry in the .rela.plt section. */ 1048 1049 s = bfd_get_section_by_name (dynobj, ".rela.plt"); 1050 BFD_ASSERT (s != NULL); 1051 s->_raw_size += sizeof (Elf32_External_Rela); 1052 1053 return TRUE; 1054 } 1055 1056 /* Reinitialize the plt offset now that it is not used as a reference 1057 count any more. */ 1058 h->plt.offset = (bfd_vma) -1; 1059 1060 /* If this is a weak symbol, and there is a real definition, the 1061 processor independent code will have arranged for us to see the 1062 real definition first, and we can just use the same value. */ 1063 if (h->weakdef != NULL) 1064 { 1065 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined 1066 || h->weakdef->root.type == bfd_link_hash_defweak); 1067 h->root.u.def.section = h->weakdef->root.u.def.section; 1068 h->root.u.def.value = h->weakdef->root.u.def.value; 1069 return TRUE; 1070 } 1071 1072 /* This is a reference to a symbol defined by a dynamic object which 1073 is not a function. */ 1074 1075 /* If we are creating a shared library, we must presume that the 1076 only references to the symbol are via the global offset table. 1077 For such cases we need not do anything here; the relocations will 1078 be handled correctly by relocate_section. */ 1079 if (info->shared) 1080 return TRUE; 1081 1082 /* We must allocate the symbol in our .dynbss section, which will 1083 become part of the .bss section of the executable. There will be 1084 an entry for this symbol in the .dynsym section. The dynamic 1085 object will contain position independent code, so all references 1086 from the dynamic object to this symbol will go through the global 1087 offset table. The dynamic linker will use the .dynsym entry to 1088 determine the address it must put in the global offset table, so 1089 both the dynamic object and the regular object will refer to the 1090 same memory location for the variable. */ 1091 1092 s = bfd_get_section_by_name (dynobj, ".dynbss"); 1093 BFD_ASSERT (s != NULL); 1094 1095 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to 1096 copy the initial value out of the dynamic object and into the 1097 runtime process image. We need to remember the offset into the 1098 .rela.bss section we are going to use. */ 1099 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1100 { 1101 asection *srel; 1102 1103 srel = bfd_get_section_by_name (dynobj, ".rela.bss"); 1104 BFD_ASSERT (srel != NULL); 1105 srel->_raw_size += sizeof (Elf32_External_Rela); 1106 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; 1107 } 1108 1109 /* We need to figure out the alignment required for this symbol. I 1110 have no idea how ELF linkers handle this. */ 1111 power_of_two = bfd_log2 (h->size); 1112 if (power_of_two > 3) 1113 power_of_two = 3; 1114 1115 /* Apply the required alignment. */ 1116 s->_raw_size = BFD_ALIGN (s->_raw_size, 1117 (bfd_size_type) (1 << power_of_two)); 1118 if (power_of_two > bfd_get_section_alignment (dynobj, s)) 1119 { 1120 if (!bfd_set_section_alignment (dynobj, s, power_of_two)) 1121 return FALSE; 1122 } 1123 1124 /* Define the symbol as being at this point in the section. */ 1125 h->root.u.def.section = s; 1126 h->root.u.def.value = s->_raw_size; 1127 1128 /* Increment the section size to make room for the symbol. */ 1129 s->_raw_size += h->size; 1130 1131 return TRUE; 1132 } 1133 1134 /* Set the sizes of the dynamic sections. */ 1135 1136 static bfd_boolean 1137 elf_vax_size_dynamic_sections (output_bfd, info) 1138 bfd *output_bfd; 1139 struct bfd_link_info *info; 1140 { 1141 bfd *dynobj; 1142 asection *s; 1143 bfd_boolean plt; 1144 bfd_boolean relocs; 1145 bfd_boolean reltext; 1146 1147 dynobj = elf_hash_table (info)->dynobj; 1148 BFD_ASSERT (dynobj != NULL); 1149 1150 if (elf_hash_table (info)->dynamic_sections_created) 1151 { 1152 /* Set the contents of the .interp section to the interpreter. */ 1153 if (info->executable && !info->static_link) 1154 { 1155 s = bfd_get_section_by_name (dynobj, ".interp"); 1156 BFD_ASSERT (s != NULL); 1157 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; 1158 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1159 } 1160 } 1161 else 1162 { 1163 /* We may have created entries in the .rela.got and .got sections. 1164 However, if we are not creating the dynamic sections, we will 1165 not actually use these entries. Reset the size of .rela.got 1166 and .got, which will cause it to get stripped from the output 1167 file below. */ 1168 s = bfd_get_section_by_name (dynobj, ".rela.got"); 1169 if (s != NULL) 1170 s->_raw_size = 0; 1171 s = bfd_get_section_by_name (dynobj, ".got.plt"); 1172 if (s != NULL) 1173 s->_raw_size = 0; 1174 s = bfd_get_section_by_name (dynobj, ".got"); 1175 if (s != NULL) 1176 s->_raw_size = 0; 1177 } 1178 1179 /* If this is a -Bsymbolic shared link, then we need to discard all PC 1180 relative relocs against symbols defined in a regular object. We 1181 allocated space for them in the check_relocs routine, but we will not 1182 fill them in in the relocate_section routine. */ 1183 if (info->shared && info->symbolic) 1184 elf_vax_link_hash_traverse (elf_vax_hash_table (info), 1185 elf_vax_discard_copies, 1186 (PTR) NULL); 1187 1188 /* If this is a -Bsymbolic shared link or a static link, we need to 1189 discard all the got entries we've recorded. Otherwise, we need to 1190 instantiate (allocate space for them). */ 1191 elf_link_hash_traverse (elf_hash_table (info), 1192 elf_vax_instantiate_got_entries, 1193 (PTR) info); 1194 1195 /* The check_relocs and adjust_dynamic_symbol entry points have 1196 determined the sizes of the various dynamic sections. Allocate 1197 memory for them. */ 1198 plt = FALSE; 1199 relocs = FALSE; 1200 reltext = FALSE; 1201 for (s = dynobj->sections; s != NULL; s = s->next) 1202 { 1203 const char *name; 1204 bfd_boolean strip; 1205 1206 if ((s->flags & SEC_LINKER_CREATED) == 0) 1207 continue; 1208 1209 /* It's OK to base decisions on the section name, because none 1210 of the dynobj section names depend upon the input files. */ 1211 name = bfd_get_section_name (dynobj, s); 1212 1213 strip = FALSE; 1214 1215 if (strcmp (name, ".plt") == 0) 1216 { 1217 if (s->_raw_size == 0) 1218 { 1219 /* Strip this section if we don't need it; see the 1220 comment below. */ 1221 strip = TRUE; 1222 } 1223 else 1224 { 1225 /* Remember whether there is a PLT. */ 1226 plt = TRUE; 1227 } 1228 } 1229 else if (strncmp (name, ".rela", 5) == 0) 1230 { 1231 if (s->_raw_size == 0) 1232 { 1233 /* If we don't need this section, strip it from the 1234 output file. This is mostly to handle .rela.bss and 1235 .rela.plt. We must create both sections in 1236 create_dynamic_sections, because they must be created 1237 before the linker maps input sections to output 1238 sections. The linker does that before 1239 adjust_dynamic_symbol is called, and it is that 1240 function which decides whether anything needs to go 1241 into these sections. */ 1242 strip = TRUE; 1243 } 1244 else 1245 { 1246 asection *target; 1247 1248 /* Remember whether there are any reloc sections other 1249 than .rela.plt. */ 1250 if (strcmp (name, ".rela.plt") != 0) 1251 { 1252 const char *outname; 1253 1254 relocs = TRUE; 1255 1256 /* If this relocation section applies to a read only 1257 section, then we probably need a DT_TEXTREL 1258 entry. .rela.plt is actually associated with 1259 .got.plt, which is never readonly. */ 1260 outname = bfd_get_section_name (output_bfd, 1261 s->output_section); 1262 target = bfd_get_section_by_name (output_bfd, outname + 5); 1263 if (target != NULL 1264 && (target->flags & SEC_READONLY) != 0 1265 && (target->flags & SEC_ALLOC) != 0) 1266 reltext = TRUE; 1267 } 1268 1269 /* We use the reloc_count field as a counter if we need 1270 to copy relocs into the output file. */ 1271 s->reloc_count = 0; 1272 } 1273 } 1274 else if (strncmp (name, ".got", 4) != 0) 1275 { 1276 /* It's not one of our sections, so don't allocate space. */ 1277 continue; 1278 } 1279 1280 if (strip) 1281 { 1282 _bfd_strip_section_from_output (info, s); 1283 continue; 1284 } 1285 1286 /* Allocate memory for the section contents. */ 1287 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. 1288 Unused entries should be reclaimed before the section's contents 1289 are written out, but at the moment this does not happen. Thus in 1290 order to prevent writing out garbage, we initialise the section's 1291 contents to zero. */ 1292 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); 1293 if (s->contents == NULL && s->_raw_size != 0) 1294 return FALSE; 1295 } 1296 1297 if (elf_hash_table (info)->dynamic_sections_created) 1298 { 1299 /* Add some entries to the .dynamic section. We fill in the 1300 values later, in elf_vax_finish_dynamic_sections, but we 1301 must add the entries now so that we get the correct size for 1302 the .dynamic section. The DT_DEBUG entry is filled in by the 1303 dynamic linker and used by the debugger. */ 1304 #define add_dynamic_entry(TAG, VAL) \ 1305 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 1306 1307 if (!info->shared) 1308 { 1309 if (!add_dynamic_entry (DT_DEBUG, 0)) 1310 return FALSE; 1311 } 1312 1313 if (plt) 1314 { 1315 if (!add_dynamic_entry (DT_PLTGOT, 0) 1316 || !add_dynamic_entry (DT_PLTRELSZ, 0) 1317 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 1318 || !add_dynamic_entry (DT_JMPREL, 0)) 1319 return FALSE; 1320 } 1321 1322 if (relocs) 1323 { 1324 if (!add_dynamic_entry (DT_RELA, 0) 1325 || !add_dynamic_entry (DT_RELASZ, 0) 1326 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 1327 return FALSE; 1328 } 1329 1330 if (reltext || (info->flags & DF_TEXTREL) != 0) 1331 { 1332 if (!add_dynamic_entry (DT_TEXTREL, 0)) 1333 return FALSE; 1334 } 1335 } 1336 #undef add_dynamic_entry 1337 1338 return TRUE; 1339 } 1340 1341 /* This function is called via elf_vax_link_hash_traverse if we are 1342 creating a shared object with -Bsymbolic. It discards the space 1343 allocated to copy PC relative relocs against symbols which are defined 1344 in regular objects. We allocated space for them in the check_relocs 1345 routine, but we won't fill them in in the relocate_section routine. */ 1346 1347 static bfd_boolean 1348 elf_vax_discard_copies (h, ignore) 1349 struct elf_vax_link_hash_entry *h; 1350 PTR ignore ATTRIBUTE_UNUSED; 1351 { 1352 struct elf_vax_pcrel_relocs_copied *s; 1353 1354 if (h->root.root.type == bfd_link_hash_warning) 1355 h = (struct elf_vax_link_hash_entry *) h->root.root.u.i.link; 1356 1357 /* We only discard relocs for symbols defined in a regular object. */ 1358 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 1359 return TRUE; 1360 1361 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) 1362 s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela); 1363 1364 return TRUE; 1365 } 1366 1367 /* This function is called via elf_link_hash_traverse. It looks for entries 1368 that have GOT or PLT (.GOT) references. If creating a static object or a 1369 shared object with -Bsymbolic, it resets the reference count back to 0 1370 and sets the offset to -1 so normal PC32 relocation will be done. If 1371 creating a shared object or executable, space in the .got and .rela.got 1372 will be reserved for the symbol. */ 1373 1374 static bfd_boolean 1375 elf_vax_instantiate_got_entries (h, infoptr) 1376 struct elf_link_hash_entry *h; 1377 PTR infoptr; 1378 { 1379 struct bfd_link_info *info = (struct bfd_link_info *) infoptr; 1380 bfd *dynobj; 1381 asection *sgot; 1382 asection *srelgot; 1383 1384 /* We don't care about non-GOT (and non-PLT) entries. */ 1385 if (h->got.refcount <= 0 && h->plt.refcount <= 0) 1386 return TRUE; 1387 1388 dynobj = elf_hash_table (info)->dynobj; 1389 if (dynobj == NULL) 1390 return TRUE; 1391 1392 sgot = bfd_get_section_by_name (dynobj, ".got"); 1393 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 1394 1395 if (!elf_hash_table (info)->dynamic_sections_created 1396 || (info->shared && info->symbolic)) 1397 { 1398 h->got.refcount = 0; 1399 h->got.offset = (bfd_vma) -1; 1400 h->plt.refcount = 0; 1401 h->plt.offset = (bfd_vma) -1; 1402 } 1403 else if (h->got.refcount > 0) 1404 { 1405 /* Make sure this symbol is output as a dynamic symbol. */ 1406 if (h->dynindx == -1) 1407 { 1408 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 1409 return FALSE; 1410 } 1411 1412 /* Allocate space in the .got and .rela.got sections. */ 1413 sgot->_raw_size += 4; 1414 srelgot->_raw_size += sizeof (Elf32_External_Rela); 1415 } 1416 1417 return TRUE; 1418 } 1419 1420 /* Relocate an VAX ELF section. */ 1421 1422 static bfd_boolean 1423 elf_vax_relocate_section (output_bfd, info, input_bfd, input_section, 1424 contents, relocs, local_syms, local_sections) 1425 bfd *output_bfd; 1426 struct bfd_link_info *info; 1427 bfd *input_bfd; 1428 asection *input_section; 1429 bfd_byte *contents; 1430 Elf_Internal_Rela *relocs; 1431 Elf_Internal_Sym *local_syms; 1432 asection **local_sections; 1433 { 1434 bfd *dynobj; 1435 Elf_Internal_Shdr *symtab_hdr; 1436 struct elf_link_hash_entry **sym_hashes; 1437 bfd_vma *local_got_offsets; 1438 bfd_vma plt_index; 1439 bfd_vma got_offset; 1440 asection *sgot; 1441 asection *splt; 1442 asection *sgotplt; 1443 asection *sreloc; 1444 Elf_Internal_Rela *rel; 1445 Elf_Internal_Rela *relend; 1446 1447 if (info->relocatable) 1448 return TRUE; 1449 1450 dynobj = elf_hash_table (info)->dynobj; 1451 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1452 sym_hashes = elf_sym_hashes (input_bfd); 1453 local_got_offsets = elf_local_got_offsets (input_bfd); 1454 1455 sgot = NULL; 1456 splt = NULL; 1457 sgotplt = NULL; 1458 sreloc = NULL; 1459 1460 rel = relocs; 1461 relend = relocs + input_section->reloc_count; 1462 for (; rel < relend; rel++) 1463 { 1464 int r_type; 1465 reloc_howto_type *howto; 1466 unsigned long r_symndx; 1467 struct elf_link_hash_entry *h; 1468 Elf_Internal_Sym *sym; 1469 asection *sec; 1470 bfd_vma relocation; 1471 bfd_reloc_status_type r; 1472 1473 r_type = ELF32_R_TYPE (rel->r_info); 1474 if (r_type < 0 || r_type >= (int) R_VAX_max) 1475 { 1476 bfd_set_error (bfd_error_bad_value); 1477 return FALSE; 1478 } 1479 howto = howto_table + r_type; 1480 1481 /* This is a final link. */ 1482 r_symndx = ELF32_R_SYM (rel->r_info); 1483 h = NULL; 1484 sym = NULL; 1485 sec = NULL; 1486 if (r_symndx < symtab_hdr->sh_info) 1487 { 1488 sym = local_syms + r_symndx; 1489 sec = local_sections[r_symndx]; 1490 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1491 } 1492 else 1493 { 1494 bfd_boolean unresolved_reloc; 1495 bfd_boolean warned; 1496 1497 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1498 r_symndx, symtab_hdr, sym_hashes, 1499 h, sec, relocation, 1500 unresolved_reloc, warned); 1501 1502 if ((h->root.type == bfd_link_hash_defined 1503 || h->root.type == bfd_link_hash_defweak) 1504 && ((r_type == R_VAX_PLT32 1505 && h->plt.offset != (bfd_vma) -1 1506 && elf_hash_table (info)->dynamic_sections_created) 1507 || (r_type == R_VAX_GOT32 1508 && strcmp (h->root.root.string, 1509 "_GLOBAL_OFFSET_TABLE_") != 0 1510 && elf_hash_table (info)->dynamic_sections_created 1511 && (! info->shared 1512 || (! info->symbolic && h->dynindx != -1) 1513 || (h->elf_link_hash_flags 1514 & ELF_LINK_HASH_DEF_REGULAR) == 0)) 1515 || (info->shared 1516 && ((! info->symbolic && h->dynindx != -1) 1517 || (h->elf_link_hash_flags 1518 & ELF_LINK_HASH_DEF_REGULAR) == 0) 1519 && ((input_section->flags & SEC_ALLOC) != 0 1520 /* DWARF will emit R_VAX_32 relocations in its 1521 sections against symbols defined externally 1522 in shared libraries. We can't do anything 1523 with them here. */ 1524 1525 || ((input_section->flags & SEC_DEBUGGING) != 0 1526 && (h->elf_link_hash_flags 1527 & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) 1528 && (r_type == R_VAX_8 1529 || r_type == R_VAX_16 1530 || r_type == R_VAX_32 1531 || r_type == R_VAX_PC8 1532 || r_type == R_VAX_PC16 1533 || r_type == R_VAX_PC32)))) 1534 /* In these cases, we don't need the relocation 1535 value. We check specially because in some 1536 obscure cases sec->output_section will be NULL. */ 1537 relocation = 0; 1538 } 1539 1540 switch (r_type) 1541 { 1542 case R_VAX_GOT32: 1543 /* Relocation is to the address of the entry for this symbol 1544 in the global offset table. */ 1545 if (h == NULL || h->got.offset == (bfd_vma) -1) 1546 break; 1547 1548 /* Relocation is the offset of the entry for this symbol in 1549 the global offset table. */ 1550 1551 { 1552 bfd_vma off; 1553 1554 if (sgot == NULL) 1555 { 1556 sgot = bfd_get_section_by_name (dynobj, ".got"); 1557 BFD_ASSERT (sgot != NULL); 1558 } 1559 1560 BFD_ASSERT (h != NULL); 1561 off = h->got.offset; 1562 BFD_ASSERT (off != (bfd_vma) -1); 1563 BFD_ASSERT (off < sgot->_raw_size); 1564 1565 if (info->shared 1566 && h->dynindx == -1 1567 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) 1568 { 1569 /* The symbol was forced to be local 1570 because of a version file.. We must initialize 1571 this entry in the global offset table. Since 1572 the offset must always be a multiple of 4, we 1573 use the least significant bit to record whether 1574 we have initialized it already. 1575 1576 When doing a dynamic link, we create a .rela.got 1577 relocation entry to initialize the value. This 1578 is done in the finish_dynamic_symbol routine. */ 1579 if ((off & 1) != 0) 1580 off &= ~1; 1581 else 1582 { 1583 bfd_put_32 (output_bfd, relocation + rel->r_addend, 1584 sgot->contents + off); 1585 h->got.offset |= 1; 1586 } 1587 } else { 1588 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off); 1589 } 1590 1591 relocation = sgot->output_offset + off; 1592 /* The GOT relocation uses the addend. */ 1593 rel->r_addend = 0; 1594 1595 /* Change the reference to be indirect. */ 1596 contents[rel->r_offset - 1] |= 0x10; 1597 relocation += sgot->output_section->vma; 1598 } 1599 break; 1600 1601 case R_VAX_PLT32: 1602 /* Relocation is to the entry for this symbol in the 1603 procedure linkage table. */ 1604 1605 /* Resolve a PLTxx reloc against a local symbol directly, 1606 without using the procedure linkage table. */ 1607 if (h == NULL) 1608 break; 1609 1610 if (h->plt.offset == (bfd_vma) -1 1611 || !elf_hash_table (info)->dynamic_sections_created) 1612 { 1613 /* We didn't make a PLT entry for this symbol. This 1614 happens when statically linking PIC code, or when 1615 using -Bsymbolic. */ 1616 break; 1617 } 1618 1619 if (splt == NULL) 1620 { 1621 splt = bfd_get_section_by_name (dynobj, ".plt"); 1622 BFD_ASSERT (splt != NULL); 1623 } 1624 1625 if (sgotplt == NULL) 1626 { 1627 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 1628 BFD_ASSERT (splt != NULL); 1629 } 1630 1631 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1632 1633 /* Get the offset into the .got table of the entry that 1634 corresponds to this function. Each .got entry is 4 bytes. 1635 The first two are reserved. */ 1636 got_offset = (plt_index + 3) * 4; 1637 1638 /* We want the relocate to point into the .got.plt instead 1639 of the plt itself. */ 1640 relocation = (sgotplt->output_section->vma 1641 + sgotplt->output_offset 1642 + got_offset); 1643 contents[rel->r_offset-1] |= 0x10; /* make indirect */ 1644 if (rel->r_addend == 2) 1645 { 1646 h->plt.offset |= 1; 1647 } 1648 else if (rel->r_addend != 0) 1649 (*_bfd_error_handler) 1650 (_("%s: warning: PLT addend of %d to `%s' from %s section ignored"), 1651 bfd_get_filename (input_bfd), rel->r_addend, 1652 h->root.root.string, 1653 bfd_get_section_name (input_bfd, input_section)); 1654 rel->r_addend = 0; 1655 1656 break; 1657 1658 case R_VAX_PC8: 1659 case R_VAX_PC16: 1660 case R_VAX_PC32: 1661 if (h == NULL) 1662 break; 1663 /* Fall through. */ 1664 case R_VAX_8: 1665 case R_VAX_16: 1666 case R_VAX_32: 1667 if (info->shared 1668 && r_symndx != 0 1669 && (input_section->flags & SEC_ALLOC) != 0 1670 && ((r_type != R_VAX_PC8 1671 && r_type != R_VAX_PC16 1672 && r_type != R_VAX_PC32) 1673 || (!info->symbolic 1674 || (h->elf_link_hash_flags 1675 & ELF_LINK_HASH_DEF_REGULAR) == 0))) 1676 { 1677 Elf_Internal_Rela outrel; 1678 bfd_byte *loc; 1679 bfd_boolean skip, relocate; 1680 1681 /* When generating a shared object, these relocations 1682 are copied into the output file to be resolved at run 1683 time. */ 1684 if (sreloc == NULL) 1685 { 1686 const char *name; 1687 1688 name = (bfd_elf_string_from_elf_section 1689 (input_bfd, 1690 elf_elfheader (input_bfd)->e_shstrndx, 1691 elf_section_data (input_section)->rel_hdr.sh_name)); 1692 if (name == NULL) 1693 return FALSE; 1694 1695 BFD_ASSERT (strncmp (name, ".rela", 5) == 0 1696 && strcmp (bfd_get_section_name (input_bfd, 1697 input_section), 1698 name + 5) == 0); 1699 1700 sreloc = bfd_get_section_by_name (dynobj, name); 1701 BFD_ASSERT (sreloc != NULL); 1702 } 1703 1704 skip = FALSE; 1705 relocate = FALSE; 1706 1707 outrel.r_offset = 1708 _bfd_elf_section_offset (output_bfd, info, input_section, 1709 rel->r_offset); 1710 if (outrel.r_offset == (bfd_vma) -1) 1711 skip = TRUE; 1712 if (outrel.r_offset == (bfd_vma) -2) 1713 skip = TRUE, relocate = TRUE; 1714 outrel.r_offset += (input_section->output_section->vma 1715 + input_section->output_offset); 1716 1717 if (skip) 1718 memset (&outrel, 0, sizeof outrel); 1719 /* h->dynindx may be -1 if the symbol was marked to 1720 become local. */ 1721 else if (h != NULL 1722 && ((! info->symbolic && h->dynindx != -1) 1723 || (h->elf_link_hash_flags 1724 & ELF_LINK_HASH_DEF_REGULAR) == 0)) 1725 { 1726 BFD_ASSERT (h->dynindx != -1); 1727 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1728 outrel.r_addend = relocation + rel->r_addend; 1729 } 1730 else 1731 { 1732 if (r_type == R_VAX_32) 1733 { 1734 relocate = TRUE; 1735 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE); 1736 BFD_ASSERT (bfd_get_signed_32 (input_bfd, 1737 &contents[rel->r_offset]) == 0); 1738 outrel.r_addend = relocation + rel->r_addend; 1739 } 1740 else 1741 { 1742 long indx; 1743 1744 if (bfd_is_abs_section (sec)) 1745 indx = 0; 1746 else if (sec == NULL || sec->owner == NULL) 1747 { 1748 bfd_set_error (bfd_error_bad_value); 1749 return FALSE; 1750 } 1751 else 1752 { 1753 asection *osec; 1754 1755 osec = sec->output_section; 1756 indx = elf_section_data (osec)->dynindx; 1757 BFD_ASSERT (indx > 0); 1758 } 1759 1760 outrel.r_info = ELF32_R_INFO (indx, r_type); 1761 outrel.r_addend = relocation + rel->r_addend; 1762 } 1763 } 1764 1765 if (!strcmp (bfd_get_section_name (input_bfd, input_section), 1766 ".text") != 0 || 1767 (info->shared 1768 && ELF32_R_TYPE(outrel.r_info) != R_VAX_32 1769 && ELF32_R_TYPE(outrel.r_info) != R_VAX_RELATIVE 1770 && ELF32_R_TYPE(outrel.r_info) != R_VAX_COPY 1771 && ELF32_R_TYPE(outrel.r_info) != R_VAX_JMP_SLOT 1772 && ELF32_R_TYPE(outrel.r_info) != R_VAX_GLOB_DAT)) 1773 { 1774 if (h != NULL) 1775 (*_bfd_error_handler) 1776 (_("%s: warning: %s relocation against symbol `%s' from %s section"), 1777 bfd_get_filename (input_bfd), howto->name, 1778 h->root.root.string, 1779 bfd_get_section_name (input_bfd, input_section)); 1780 else 1781 (*_bfd_error_handler) 1782 (_("%s: warning: %s relocation to 0x%x from %s section"), 1783 bfd_get_filename (input_bfd), howto->name, 1784 outrel.r_addend, 1785 bfd_get_section_name (input_bfd, input_section)); 1786 } 1787 loc = sreloc->contents; 1788 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1789 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1790 1791 /* This reloc will be computed at runtime, so there's no 1792 need to do anything now, except for R_VAX_32 1793 relocations that have been turned into 1794 R_VAX_RELATIVE. */ 1795 if (!relocate) 1796 continue; 1797 } 1798 1799 break; 1800 1801 case R_VAX_GNU_VTINHERIT: 1802 case R_VAX_GNU_VTENTRY: 1803 /* These are no-ops in the end. */ 1804 continue; 1805 1806 default: 1807 break; 1808 } 1809 1810 /* VAX PCREL relocations are from the end of relocation, not the start. 1811 So subtract the difference from the relocation amount since we can't 1812 add it to the offset. */ 1813 if (howto->pc_relative && howto->pcrel_offset) 1814 relocation -= bfd_get_reloc_size(howto); 1815 1816 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1817 contents, rel->r_offset, 1818 relocation, rel->r_addend); 1819 1820 if (r != bfd_reloc_ok) 1821 { 1822 switch (r) 1823 { 1824 default: 1825 case bfd_reloc_outofrange: 1826 abort (); 1827 case bfd_reloc_overflow: 1828 { 1829 const char *name; 1830 1831 if (h != NULL) 1832 name = h->root.root.string; 1833 else 1834 { 1835 name = bfd_elf_string_from_elf_section (input_bfd, 1836 symtab_hdr->sh_link, 1837 sym->st_name); 1838 if (name == NULL) 1839 return FALSE; 1840 if (*name == '\0') 1841 name = bfd_section_name (input_bfd, sec); 1842 } 1843 if (!(info->callbacks->reloc_overflow 1844 (info, name, howto->name, (bfd_vma) 0, 1845 input_bfd, input_section, rel->r_offset))) 1846 return FALSE; 1847 } 1848 break; 1849 } 1850 } 1851 } 1852 1853 return TRUE; 1854 } 1855 1856 /* Finish up dynamic symbol handling. We set the contents of various 1857 dynamic sections here. */ 1858 1859 static bfd_boolean 1860 elf_vax_finish_dynamic_symbol (output_bfd, info, h, sym) 1861 bfd *output_bfd; 1862 struct bfd_link_info *info; 1863 struct elf_link_hash_entry *h; 1864 Elf_Internal_Sym *sym; 1865 { 1866 bfd *dynobj; 1867 1868 dynobj = elf_hash_table (info)->dynobj; 1869 1870 if (h->plt.offset != (bfd_vma) -1) 1871 { 1872 asection *splt; 1873 asection *sgot; 1874 asection *srela; 1875 bfd_vma plt_index; 1876 bfd_vma got_offset; 1877 bfd_vma addend; 1878 Elf_Internal_Rela rela; 1879 bfd_byte *loc; 1880 1881 /* This symbol has an entry in the procedure linkage table. Set 1882 it up. */ 1883 BFD_ASSERT (h->dynindx != -1); 1884 1885 splt = bfd_get_section_by_name (dynobj, ".plt"); 1886 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 1887 srela = bfd_get_section_by_name (dynobj, ".rela.plt"); 1888 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 1889 1890 addend = 2 * (h->plt.offset & 1); 1891 h->plt.offset &= ~1; 1892 1893 /* Get the index in the procedure linkage table which 1894 corresponds to this symbol. This is the index of this symbol 1895 in all the symbols for which we are making plt entries. The 1896 first entry in the procedure linkage table is reserved. */ 1897 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1898 1899 /* Get the offset into the .got table of the entry that 1900 corresponds to this function. Each .got entry is 4 bytes. 1901 The first two are reserved. */ 1902 got_offset = (plt_index + 3) * 4; 1903 1904 /* Fill in the entry in the procedure linkage table. */ 1905 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry, 1906 PLT_ENTRY_SIZE); 1907 1908 /* The offset is relative to the first extension word. */ 1909 bfd_put_32 (output_bfd, 1910 -(h->plt.offset + 8), 1911 splt->contents + h->plt.offset + 4); 1912 1913 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 1914 splt->contents + h->plt.offset + 8); 1915 1916 /* Fill in the entry in the global offset table. */ 1917 bfd_put_32 (output_bfd, 1918 (splt->output_section->vma 1919 + splt->output_offset 1920 + h->plt.offset) + addend, 1921 sgot->contents + got_offset); 1922 1923 /* Fill in the entry in the .rela.plt section. */ 1924 rela.r_offset = (sgot->output_section->vma 1925 + sgot->output_offset 1926 + got_offset); 1927 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT); 1928 rela.r_addend = addend; 1929 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 1930 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1931 1932 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 1933 { 1934 /* Mark the symbol as undefined, rather than as defined in 1935 the .plt section. Leave the value alone. */ 1936 sym->st_shndx = SHN_UNDEF; 1937 } 1938 } 1939 1940 if (h->got.offset != (bfd_vma) -1) 1941 { 1942 asection *sgot; 1943 asection *srela; 1944 Elf_Internal_Rela rela; 1945 bfd_byte *loc; 1946 1947 /* This symbol has an entry in the global offset table. Set it 1948 up. */ 1949 sgot = bfd_get_section_by_name (dynobj, ".got"); 1950 srela = bfd_get_section_by_name (dynobj, ".rela.got"); 1951 BFD_ASSERT (sgot != NULL && srela != NULL); 1952 1953 rela.r_offset = (sgot->output_section->vma 1954 + sgot->output_offset 1955 + (h->got.offset &~ 1)); 1956 1957 /* If the symbol was forced to be local because of a version file 1958 locally we just want to emit a RELATIVE reloc. The entry in 1959 the global offset table will already have been initialized in 1960 the relocate_section function. */ 1961 if (info->shared 1962 && h->dynindx == -1 1963 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) 1964 { 1965 rela.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE); 1966 } 1967 else 1968 { 1969 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT); 1970 } 1971 rela.r_addend = bfd_get_signed_32 (output_bfd, 1972 (sgot->contents 1973 + (h->got.offset & ~1))); 1974 1975 loc = srela->contents; 1976 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 1977 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1978 } 1979 1980 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) 1981 { 1982 asection *s; 1983 Elf_Internal_Rela rela; 1984 bfd_byte *loc; 1985 1986 /* This symbol needs a copy reloc. Set it up. */ 1987 BFD_ASSERT (h->dynindx != -1 1988 && (h->root.type == bfd_link_hash_defined 1989 || h->root.type == bfd_link_hash_defweak)); 1990 1991 s = bfd_get_section_by_name (h->root.u.def.section->owner, 1992 ".rela.bss"); 1993 BFD_ASSERT (s != NULL); 1994 1995 rela.r_offset = (h->root.u.def.value 1996 + h->root.u.def.section->output_section->vma 1997 + h->root.u.def.section->output_offset); 1998 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY); 1999 rela.r_addend = 0; 2000 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 2001 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 2002 } 2003 2004 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 2005 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 2006 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 2007 sym->st_shndx = SHN_ABS; 2008 2009 return TRUE; 2010 } 2011 2012 /* Finish up the dynamic sections. */ 2013 2014 static bfd_boolean 2015 elf_vax_finish_dynamic_sections (output_bfd, info) 2016 bfd *output_bfd; 2017 struct bfd_link_info *info; 2018 { 2019 bfd *dynobj; 2020 asection *sgot; 2021 asection *sdyn; 2022 2023 dynobj = elf_hash_table (info)->dynobj; 2024 2025 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 2026 BFD_ASSERT (sgot != NULL); 2027 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 2028 2029 if (elf_hash_table (info)->dynamic_sections_created) 2030 { 2031 asection *splt; 2032 Elf32_External_Dyn *dyncon, *dynconend; 2033 2034 splt = bfd_get_section_by_name (dynobj, ".plt"); 2035 BFD_ASSERT (splt != NULL && sdyn != NULL); 2036 2037 dyncon = (Elf32_External_Dyn *) sdyn->contents; 2038 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); 2039 for (; dyncon < dynconend; dyncon++) 2040 { 2041 Elf_Internal_Dyn dyn; 2042 const char *name; 2043 asection *s; 2044 2045 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 2046 2047 switch (dyn.d_tag) 2048 { 2049 default: 2050 break; 2051 2052 case DT_PLTGOT: 2053 name = ".got"; 2054 goto get_vma; 2055 case DT_JMPREL: 2056 name = ".rela.plt"; 2057 get_vma: 2058 s = bfd_get_section_by_name (output_bfd, name); 2059 BFD_ASSERT (s != NULL); 2060 dyn.d_un.d_ptr = s->vma; 2061 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2062 break; 2063 2064 case DT_PLTRELSZ: 2065 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2066 BFD_ASSERT (s != NULL); 2067 if (s->_cooked_size != 0) 2068 dyn.d_un.d_val = s->_cooked_size; 2069 else 2070 dyn.d_un.d_val = s->_raw_size; 2071 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2072 break; 2073 2074 case DT_RELASZ: 2075 /* The procedure linkage table relocs (DT_JMPREL) should 2076 not be included in the overall relocs (DT_RELA). 2077 Therefore, we override the DT_RELASZ entry here to 2078 make it not include the JMPREL relocs. Since the 2079 linker script arranges for .rela.plt to follow all 2080 other relocation sections, we don't have to worry 2081 about changing the DT_RELA entry. */ 2082 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2083 if (s != NULL) 2084 { 2085 if (s->_cooked_size != 0) 2086 dyn.d_un.d_val -= s->_cooked_size; 2087 else 2088 dyn.d_un.d_val -= s->_raw_size; 2089 } 2090 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2091 break; 2092 } 2093 } 2094 2095 /* Fill in the first entry in the procedure linkage table. */ 2096 if (splt->_raw_size > 0) 2097 { 2098 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE); 2099 bfd_put_32 (output_bfd, 2100 (sgot->output_section->vma 2101 + sgot->output_offset + 4 2102 - (splt->output_section->vma + 6)), 2103 splt->contents + 2); 2104 bfd_put_32 (output_bfd, 2105 (sgot->output_section->vma 2106 + sgot->output_offset + 8 2107 - (splt->output_section->vma + 12)), 2108 splt->contents + 8); 2109 elf_section_data (splt->output_section)->this_hdr.sh_entsize 2110 = PLT_ENTRY_SIZE; 2111 } 2112 } 2113 2114 /* Fill in the first three entries in the global offset table. */ 2115 if (sgot->_raw_size > 0) 2116 { 2117 if (sdyn == NULL) 2118 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 2119 else 2120 bfd_put_32 (output_bfd, 2121 sdyn->output_section->vma + sdyn->output_offset, 2122 sgot->contents); 2123 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 2124 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 2125 } 2126 2127 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2128 2129 return TRUE; 2130 } 2131 2132 #define TARGET_LITTLE_SYM bfd_elf32_vax_vec 2133 #define TARGET_LITTLE_NAME "elf32-vax" 2134 #define ELF_MACHINE_CODE EM_VAX 2135 #define ELF_MAXPAGESIZE 0x1000 2136 2137 #define elf_backend_create_dynamic_sections \ 2138 _bfd_elf_create_dynamic_sections 2139 #define bfd_elf32_bfd_link_hash_table_create \ 2140 elf_vax_link_hash_table_create 2141 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link 2142 2143 #define elf_backend_check_relocs elf_vax_check_relocs 2144 #define elf_backend_adjust_dynamic_symbol \ 2145 elf_vax_adjust_dynamic_symbol 2146 #define elf_backend_size_dynamic_sections \ 2147 elf_vax_size_dynamic_sections 2148 #define elf_backend_relocate_section elf_vax_relocate_section 2149 #define elf_backend_finish_dynamic_symbol \ 2150 elf_vax_finish_dynamic_symbol 2151 #define elf_backend_finish_dynamic_sections \ 2152 elf_vax_finish_dynamic_sections 2153 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook 2154 #define elf_backend_gc_sweep_hook elf_vax_gc_sweep_hook 2155 #define bfd_elf32_bfd_merge_private_bfd_data \ 2156 elf32_vax_merge_private_bfd_data 2157 #define bfd_elf32_bfd_set_private_flags \ 2158 elf32_vax_set_private_flags 2159 #define bfd_elf32_bfd_print_private_bfd_data \ 2160 elf32_vax_print_private_bfd_data 2161 2162 #define elf_backend_can_gc_sections 1 2163 #define elf_backend_want_got_plt 1 2164 #define elf_backend_plt_readonly 1 2165 #define elf_backend_want_plt_sym 0 2166 #define elf_backend_got_header_size 16 2167 #define elf_backend_rela_normal 1 2168 2169 #include "elf32-target.h" 2170