1 /* VAX series support for 32-bit ELF 2 Copyright 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 3 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 3 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., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 #include "sysdep.h" 24 #include "bfd.h" 25 #include "bfdlink.h" 26 #include "libbfd.h" 27 #include "elf-bfd.h" 28 #include "elf/vax.h" 29 30 static reloc_howto_type *reloc_type_lookup (bfd *, bfd_reloc_code_real_type); 31 static void rtype_to_howto (bfd *, arelent *, Elf_Internal_Rela *); 32 static struct bfd_hash_entry *elf_vax_link_hash_newfunc (struct bfd_hash_entry *, 33 struct bfd_hash_table *, 34 const char *); 35 static struct bfd_link_hash_table *elf_vax_link_hash_table_create (bfd *); 36 static bfd_boolean elf_vax_check_relocs (bfd *, struct bfd_link_info *, 37 asection *, const Elf_Internal_Rela *); 38 static bfd_boolean elf_vax_adjust_dynamic_symbol (struct bfd_link_info *, 39 struct elf_link_hash_entry *); 40 static bfd_boolean elf_vax_size_dynamic_sections (bfd *, struct bfd_link_info *); 41 static bfd_boolean elf_vax_relocate_section (bfd *, struct bfd_link_info *, 42 bfd *, asection *, bfd_byte *, 43 Elf_Internal_Rela *, 44 Elf_Internal_Sym *, asection **); 45 static bfd_boolean elf_vax_finish_dynamic_symbol (bfd *, struct bfd_link_info *, 46 struct elf_link_hash_entry *, 47 Elf_Internal_Sym *); 48 static bfd_boolean elf_vax_finish_dynamic_sections (bfd *, 49 struct bfd_link_info *); 50 static bfd_vma elf_vax_plt_sym_val (bfd_vma, const asection *, 51 const arelent *); 52 53 static bfd_boolean elf32_vax_set_private_flags (bfd *, flagword); 54 static bfd_boolean elf32_vax_merge_private_bfd_data (bfd *, bfd *); 55 static bfd_boolean elf32_vax_print_private_bfd_data (bfd *, PTR); 56 57 static reloc_howto_type howto_table[] = { 58 HOWTO (R_VAX_NONE, /* type */ 59 0, /* rightshift */ 60 0, /* size (0 = byte, 1 = short, 2 = long) */ 61 0, /* bitsize */ 62 FALSE, /* pc_relative */ 63 0, /* bitpos */ 64 complain_overflow_dont, /* complain_on_overflow */ 65 bfd_elf_generic_reloc, /* special_function */ 66 "R_VAX_NONE", /* name */ 67 FALSE, /* partial_inplace */ 68 0, /* src_mask */ 69 0x00000000, /* dst_mask */ 70 FALSE), /* pcrel_offset */ 71 72 HOWTO (R_VAX_32, /* type */ 73 0, /* rightshift */ 74 2, /* size (0 = byte, 1 = short, 2 = long) */ 75 32, /* bitsize */ 76 FALSE, /* pc_relative */ 77 0, /* bitpos */ 78 complain_overflow_bitfield, /* complain_on_overflow */ 79 bfd_elf_generic_reloc, /* special_function */ 80 "R_VAX_32", /* name */ 81 FALSE, /* partial_inplace */ 82 0, /* src_mask */ 83 0xffffffff, /* dst_mask */ 84 FALSE), /* pcrel_offset */ 85 86 HOWTO (R_VAX_16, /* type */ 87 0, /* rightshift */ 88 1, /* size (0 = byte, 1 = short, 2 = long) */ 89 16, /* bitsize */ 90 FALSE, /* pc_relative */ 91 0, /* bitpos */ 92 complain_overflow_bitfield, /* complain_on_overflow */ 93 bfd_elf_generic_reloc, /* special_function */ 94 "R_VAX_16", /* name */ 95 FALSE, /* partial_inplace */ 96 0, /* src_mask */ 97 0x0000ffff, /* dst_mask */ 98 FALSE), /* pcrel_offset */ 99 100 HOWTO (R_VAX_8, /* type */ 101 0, /* rightshift */ 102 0, /* size (0 = byte, 1 = short, 2 = long) */ 103 8, /* bitsize */ 104 FALSE, /* pc_relative */ 105 0, /* bitpos */ 106 complain_overflow_bitfield, /* complain_on_overflow */ 107 bfd_elf_generic_reloc, /* special_function */ 108 "R_VAX_8", /* name */ 109 FALSE, /* partial_inplace */ 110 0, /* src_mask */ 111 0x000000ff, /* dst_mask */ 112 FALSE), /* pcrel_offset */ 113 114 HOWTO (R_VAX_PC32, /* type */ 115 0, /* rightshift */ 116 2, /* size (0 = byte, 1 = short, 2 = long) */ 117 32, /* bitsize */ 118 TRUE, /* pc_relative */ 119 0, /* bitpos */ 120 complain_overflow_bitfield, /* complain_on_overflow */ 121 bfd_elf_generic_reloc, /* special_function */ 122 "R_VAX_PC32", /* name */ 123 FALSE, /* partial_inplace */ 124 0, /* src_mask */ 125 0xffffffff, /* dst_mask */ 126 TRUE), /* pcrel_offset */ 127 128 HOWTO (R_VAX_PC16, /* type */ 129 0, /* rightshift */ 130 1, /* size (0 = byte, 1 = short, 2 = long) */ 131 16, /* bitsize */ 132 TRUE, /* pc_relative */ 133 0, /* bitpos */ 134 complain_overflow_signed, /* complain_on_overflow */ 135 bfd_elf_generic_reloc, /* special_function */ 136 "R_VAX_PC16", /* name */ 137 FALSE, /* partial_inplace */ 138 0, /* src_mask */ 139 0x0000ffff, /* dst_mask */ 140 TRUE), /* pcrel_offset */ 141 142 HOWTO (R_VAX_PC8, /* type */ 143 0, /* rightshift */ 144 0, /* size (0 = byte, 1 = short, 2 = long) */ 145 8, /* bitsize */ 146 TRUE, /* pc_relative */ 147 0, /* bitpos */ 148 complain_overflow_signed, /* complain_on_overflow */ 149 bfd_elf_generic_reloc, /* special_function */ 150 "R_VAX_PC8", /* name */ 151 FALSE, /* partial_inplace */ 152 0, /* src_mask */ 153 0x000000ff, /* dst_mask */ 154 TRUE), /* pcrel_offset */ 155 156 HOWTO (R_VAX_GOT32, /* type */ 157 0, /* rightshift */ 158 2, /* size (0 = byte, 1 = short, 2 = long) */ 159 32, /* bitsize */ 160 TRUE, /* pc_relative */ 161 0, /* bitpos */ 162 complain_overflow_bitfield, /* complain_on_overflow */ 163 bfd_elf_generic_reloc, /* special_function */ 164 "R_VAX_GOT32", /* name */ 165 FALSE, /* partial_inplace */ 166 0, /* src_mask */ 167 0xffffffff, /* dst_mask */ 168 TRUE), /* pcrel_offset */ 169 170 EMPTY_HOWTO (-1), 171 EMPTY_HOWTO (-1), 172 EMPTY_HOWTO (-1), 173 EMPTY_HOWTO (-1), 174 EMPTY_HOWTO (-1), 175 176 HOWTO (R_VAX_PLT32, /* type */ 177 0, /* rightshift */ 178 2, /* size (0 = byte, 1 = short, 2 = long) */ 179 32, /* bitsize */ 180 TRUE, /* pc_relative */ 181 0, /* bitpos */ 182 complain_overflow_bitfield, /* complain_on_overflow */ 183 bfd_elf_generic_reloc, /* special_function */ 184 "R_VAX_PLT32", /* name */ 185 FALSE, /* partial_inplace */ 186 0, /* src_mask */ 187 0xffffffff, /* dst_mask */ 188 TRUE), /* pcrel_offset */ 189 190 EMPTY_HOWTO (-1), 191 EMPTY_HOWTO (-1), 192 EMPTY_HOWTO (-1), 193 EMPTY_HOWTO (-1), 194 EMPTY_HOWTO (-1), 195 196 HOWTO (R_VAX_COPY, /* type */ 197 0, /* rightshift */ 198 0, /* size (0 = byte, 1 = short, 2 = long) */ 199 0, /* bitsize */ 200 FALSE, /* pc_relative */ 201 0, /* bitpos */ 202 complain_overflow_dont, /* complain_on_overflow */ 203 bfd_elf_generic_reloc, /* special_function */ 204 "R_VAX_COPY", /* name */ 205 FALSE, /* partial_inplace */ 206 0, /* src_mask */ 207 0xffffffff, /* dst_mask */ 208 FALSE), /* pcrel_offset */ 209 210 HOWTO (R_VAX_GLOB_DAT, /* type */ 211 0, /* rightshift */ 212 2, /* size (0 = byte, 1 = short, 2 = long) */ 213 32, /* bitsize */ 214 FALSE, /* pc_relative */ 215 0, /* bitpos */ 216 complain_overflow_dont, /* complain_on_overflow */ 217 bfd_elf_generic_reloc, /* special_function */ 218 "R_VAX_GLOB_DAT", /* name */ 219 FALSE, /* partial_inplace */ 220 0, /* src_mask */ 221 0xffffffff, /* dst_mask */ 222 FALSE), /* pcrel_offset */ 223 224 HOWTO (R_VAX_JMP_SLOT, /* type */ 225 0, /* rightshift */ 226 2, /* size (0 = byte, 1 = short, 2 = long) */ 227 32, /* bitsize */ 228 FALSE, /* pc_relative */ 229 0, /* bitpos */ 230 complain_overflow_dont, /* complain_on_overflow */ 231 bfd_elf_generic_reloc, /* special_function */ 232 "R_VAX_JMP_SLOT", /* name */ 233 FALSE, /* partial_inplace */ 234 0, /* src_mask */ 235 0xffffffff, /* dst_mask */ 236 FALSE), /* pcrel_offset */ 237 238 HOWTO (R_VAX_RELATIVE, /* type */ 239 0, /* rightshift */ 240 2, /* size (0 = byte, 1 = short, 2 = long) */ 241 32, /* bitsize */ 242 FALSE, /* pc_relative */ 243 0, /* bitpos */ 244 complain_overflow_dont, /* complain_on_overflow */ 245 bfd_elf_generic_reloc, /* special_function */ 246 "R_VAX_RELATIVE", /* name */ 247 FALSE, /* partial_inplace */ 248 0, /* src_mask */ 249 0xffffffff, /* dst_mask */ 250 FALSE), /* pcrel_offset */ 251 252 /* GNU extension to record C++ vtable hierarchy */ 253 HOWTO (R_VAX_GNU_VTINHERIT, /* type */ 254 0, /* rightshift */ 255 2, /* size (0 = byte, 1 = short, 2 = long) */ 256 0, /* bitsize */ 257 FALSE, /* pc_relative */ 258 0, /* bitpos */ 259 complain_overflow_dont, /* complain_on_overflow */ 260 NULL, /* special_function */ 261 "R_VAX_GNU_VTINHERIT", /* name */ 262 FALSE, /* partial_inplace */ 263 0, /* src_mask */ 264 0, /* dst_mask */ 265 FALSE), /* pcrel_offset */ 266 267 /* GNU extension to record C++ vtable member usage */ 268 HOWTO (R_VAX_GNU_VTENTRY, /* type */ 269 0, /* rightshift */ 270 2, /* size (0 = byte, 1 = short, 2 = long) */ 271 0, /* bitsize */ 272 FALSE, /* pc_relative */ 273 0, /* bitpos */ 274 complain_overflow_dont, /* complain_on_overflow */ 275 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 276 "R_VAX_GNU_VTENTRY", /* name */ 277 FALSE, /* partial_inplace */ 278 0, /* src_mask */ 279 0, /* dst_mask */ 280 FALSE), /* pcrel_offset */ 281 }; 282 283 static void 284 rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, 285 Elf_Internal_Rela *dst) 286 { 287 BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_VAX_max); 288 cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)]; 289 } 290 291 #define elf_info_to_howto rtype_to_howto 292 293 static const struct 294 { 295 bfd_reloc_code_real_type bfd_val; 296 int elf_val; 297 } reloc_map[] = { 298 { BFD_RELOC_NONE, R_VAX_NONE }, 299 { BFD_RELOC_32, R_VAX_32 }, 300 { BFD_RELOC_16, R_VAX_16 }, 301 { BFD_RELOC_8, R_VAX_8 }, 302 { BFD_RELOC_32_PCREL, R_VAX_PC32 }, 303 { BFD_RELOC_16_PCREL, R_VAX_PC16 }, 304 { BFD_RELOC_8_PCREL, R_VAX_PC8 }, 305 { BFD_RELOC_32_GOT_PCREL, R_VAX_GOT32 }, 306 { BFD_RELOC_32_PLT_PCREL, R_VAX_PLT32 }, 307 { BFD_RELOC_NONE, R_VAX_COPY }, 308 { BFD_RELOC_VAX_GLOB_DAT, R_VAX_GLOB_DAT }, 309 { BFD_RELOC_VAX_JMP_SLOT, R_VAX_JMP_SLOT }, 310 { BFD_RELOC_VAX_RELATIVE, R_VAX_RELATIVE }, 311 { BFD_RELOC_CTOR, R_VAX_32 }, 312 { BFD_RELOC_VTABLE_INHERIT, R_VAX_GNU_VTINHERIT }, 313 { BFD_RELOC_VTABLE_ENTRY, R_VAX_GNU_VTENTRY }, 314 }; 315 316 static reloc_howto_type * 317 reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code) 318 { 319 unsigned int i; 320 for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) 321 { 322 if (reloc_map[i].bfd_val == code) 323 return &howto_table[reloc_map[i].elf_val]; 324 } 325 return 0; 326 } 327 328 static reloc_howto_type * 329 reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 330 const char *r_name) 331 { 332 unsigned int i; 333 334 for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) 335 if (howto_table[i].name != NULL 336 && strcasecmp (howto_table[i].name, r_name) == 0) 337 return &howto_table[i]; 338 339 return NULL; 340 } 341 342 #define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup 343 #define bfd_elf32_bfd_reloc_name_lookup reloc_name_lookup 344 #define ELF_ARCH bfd_arch_vax 345 /* end code generated by elf.el */ 346 347 /* Functions for the VAX ELF linker. */ 348 349 /* The name of the dynamic interpreter. This is put in the .interp 350 section. */ 351 352 #define ELF_DYNAMIC_INTERPRETER "/usr/libexec/ld.elf_so" 353 354 /* The size in bytes of an entry in the procedure linkage table. */ 355 356 #define PLT_ENTRY_SIZE 12 357 358 /* The first entry in a procedure linkage table looks like this. See 359 the SVR4 ABI VAX supplement to see how this works. */ 360 361 static const bfd_byte elf_vax_plt0_entry[PLT_ENTRY_SIZE] = 362 { 363 0xdd, 0xef, /* pushl l^ */ 364 0, 0, 0, 0, /* offset to .plt.got + 4 */ 365 0x17, 0xff, /* jmp @L^(pc) */ 366 0, 0, 0, 0, /* offset to .plt.got + 8 */ 367 }; 368 369 /* Subsequent entries in a procedure linkage table look like this. */ 370 371 static const bfd_byte elf_vax_plt_entry[PLT_ENTRY_SIZE] = 372 { 373 0xfc, 0x0f, /* .word ^M<r11:r2> */ 374 0x16, 0xef, /* jsb L^(pc) */ 375 0, 0, 0, 0, /* replaced with offset to start of .plt */ 376 0, 0, 0, 0, /* index into .rela.plt */ 377 }; 378 379 /* The VAX linker needs to keep track of the number of relocs that it 380 decides to copy in check_relocs for each symbol. This is so that it 381 can discard PC relative relocs if it doesn't need them when linking 382 with -Bsymbolic. We store the information in a field extending the 383 regular ELF linker hash table. */ 384 385 /* This structure keeps track of the number of PC relative relocs we have 386 copied for a given symbol. */ 387 388 struct elf_vax_pcrel_relocs_copied 389 { 390 /* Next section. */ 391 struct elf_vax_pcrel_relocs_copied *next; 392 /* A section in dynobj. */ 393 asection *section; 394 /* Number of relocs copied in this section. */ 395 bfd_size_type count; 396 }; 397 398 /* VAX ELF linker hash entry. */ 399 400 struct elf_vax_link_hash_entry 401 { 402 struct elf_link_hash_entry root; 403 404 /* Number of PC relative relocs copied for this symbol. */ 405 struct elf_vax_pcrel_relocs_copied *pcrel_relocs_copied; 406 407 bfd_vma got_addend; 408 }; 409 410 /* Declare this now that the above structures are defined. */ 411 412 static bfd_boolean elf_vax_discard_copies (struct elf_vax_link_hash_entry *, 413 void *); 414 415 /* Declare this now that the above structures are defined. */ 416 417 static bfd_boolean elf_vax_instantiate_got_entries (struct elf_link_hash_entry *, 418 void *); 419 420 /* Traverse an VAX ELF linker hash table. */ 421 422 #define elf_vax_link_hash_traverse(table, func, info) \ 423 (elf_link_hash_traverse \ 424 ((table), \ 425 (bfd_boolean (*) (struct elf_link_hash_entry *, PTR)) (func), \ 426 (info))) 427 428 /* Create an entry in an VAX ELF linker hash table. */ 429 430 static struct bfd_hash_entry * 431 elf_vax_link_hash_newfunc (struct bfd_hash_entry *entry, 432 struct bfd_hash_table *table, 433 const char *string) 434 { 435 struct elf_vax_link_hash_entry *ret = 436 (struct elf_vax_link_hash_entry *) entry; 437 438 /* Allocate the structure if it has not already been allocated by a 439 subclass. */ 440 if (ret == NULL) 441 ret = ((struct elf_vax_link_hash_entry *) 442 bfd_hash_allocate (table, 443 sizeof (struct elf_vax_link_hash_entry))); 444 if (ret == NULL) 445 return (struct bfd_hash_entry *) ret; 446 447 /* Call the allocation method of the superclass. */ 448 ret = ((struct elf_vax_link_hash_entry *) 449 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, 450 table, string)); 451 if (ret != NULL) 452 { 453 ret->pcrel_relocs_copied = NULL; 454 } 455 456 return (struct bfd_hash_entry *) ret; 457 } 458 459 /* Create an VAX ELF linker hash table. */ 460 461 static struct bfd_link_hash_table * 462 elf_vax_link_hash_table_create (bfd *abfd) 463 { 464 struct elf_link_hash_table *ret; 465 bfd_size_type amt = sizeof (struct elf_link_hash_table); 466 467 ret = bfd_malloc (amt); 468 if (ret == NULL) 469 return NULL; 470 471 if (!_bfd_elf_link_hash_table_init (ret, abfd, 472 elf_vax_link_hash_newfunc, 473 sizeof (struct elf_vax_link_hash_entry), 474 GENERIC_ELF_DATA)) 475 { 476 free (ret); 477 return NULL; 478 } 479 480 return &ret->root; 481 } 482 483 /* Keep vax-specific flags in the ELF header */ 484 static bfd_boolean 485 elf32_vax_set_private_flags (bfd *abfd, flagword flags) 486 { 487 elf_elfheader (abfd)->e_flags = flags; 488 elf_flags_init (abfd) = TRUE; 489 return TRUE; 490 } 491 492 /* Copy vax-specific data from one module to another */ 493 static bfd_boolean 494 elf32_vax_copy_private_bfd_data (bfd *ibfd, bfd *obfd) 495 { 496 flagword in_flags; 497 498 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour 499 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 500 return TRUE; 501 502 in_flags = elf_elfheader (ibfd)->e_flags; 503 504 elf_elfheader (obfd)->e_flags = in_flags; 505 elf_flags_init (obfd) = TRUE; 506 507 return TRUE; 508 } 509 510 /* Merge backend specific data from an object file to the output 511 object file when linking. */ 512 static bfd_boolean 513 elf32_vax_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 514 { 515 flagword in_flags; 516 517 if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour 518 || bfd_get_flavour (obfd) != bfd_target_elf_flavour) 519 return TRUE; 520 521 in_flags = elf_elfheader (ibfd)->e_flags; 522 523 if (!elf_flags_init (obfd)) 524 { 525 elf_flags_init (obfd) = TRUE; 526 elf_elfheader (obfd)->e_flags = in_flags; 527 } 528 529 return TRUE; 530 } 531 532 /* Display the flags field */ 533 static bfd_boolean 534 elf32_vax_print_private_bfd_data (bfd *abfd, 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 (bfd *abfd, struct bfd_link_info *info, asection *sec, 567 const Elf_Internal_Rela *relocs) 568 { 569 bfd *dynobj; 570 Elf_Internal_Shdr *symtab_hdr; 571 struct elf_link_hash_entry **sym_hashes; 572 const Elf_Internal_Rela *rel; 573 const Elf_Internal_Rela *rel_end; 574 asection *sgot; 575 asection *srelgot; 576 asection *sreloc; 577 578 if (info->relocatable) 579 return TRUE; 580 581 dynobj = elf_hash_table (info)->dynobj; 582 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 583 sym_hashes = elf_sym_hashes (abfd); 584 585 sgot = NULL; 586 srelgot = NULL; 587 sreloc = NULL; 588 589 rel_end = relocs + sec->reloc_count; 590 for (rel = relocs; rel < rel_end; rel++) 591 { 592 unsigned long r_symndx; 593 struct elf_link_hash_entry *h; 594 595 r_symndx = ELF32_R_SYM (rel->r_info); 596 597 if (r_symndx < symtab_hdr->sh_info) 598 h = NULL; 599 else 600 { 601 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 602 while (h->root.type == bfd_link_hash_indirect 603 || h->root.type == bfd_link_hash_warning) 604 h = (struct elf_link_hash_entry *) h->root.u.i.link; 605 } 606 607 switch (ELF32_R_TYPE (rel->r_info)) 608 { 609 case R_VAX_GOT32: 610 BFD_ASSERT (h != NULL); 611 if (h->forced_local 612 || h == elf_hash_table (info)->hgot 613 || h == elf_hash_table (info)->hplt) 614 break; 615 616 /* If this is a local symbol, we resolve it directly without 617 creating a global offset table entry. */ 618 if (h == NULL || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 619 break; 620 621 /* This symbol requires a global offset table entry. */ 622 623 if (dynobj == NULL) 624 { 625 /* Create the .got section. */ 626 elf_hash_table (info)->dynobj = dynobj = abfd; 627 if (!_bfd_elf_create_got_section (dynobj, info)) 628 return FALSE; 629 } 630 631 if (sgot == NULL) 632 { 633 sgot = bfd_get_section_by_name (dynobj, ".got"); 634 BFD_ASSERT (sgot != NULL); 635 } 636 637 if (srelgot == NULL 638 && (h != NULL || info->shared)) 639 { 640 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 641 if (srelgot == NULL) 642 { 643 srelgot = bfd_make_section_with_flags (dynobj, 644 ".rela.got", 645 (SEC_ALLOC 646 | SEC_LOAD 647 | SEC_HAS_CONTENTS 648 | SEC_IN_MEMORY 649 | SEC_LINKER_CREATED 650 | SEC_READONLY)); 651 if (srelgot == NULL 652 || !bfd_set_section_alignment (dynobj, srelgot, 2)) 653 return FALSE; 654 } 655 } 656 657 if (h != NULL) 658 { 659 struct elf_vax_link_hash_entry *eh; 660 661 eh = (struct elf_vax_link_hash_entry *) h; 662 if (h->got.refcount == -1) 663 { 664 h->got.refcount = 1; 665 eh->got_addend = rel->r_addend; 666 } 667 else 668 { 669 h->got.refcount++; 670 if (eh->got_addend != (bfd_vma) rel->r_addend) 671 (*_bfd_error_handler) 672 (_("%s: warning: GOT addend of %ld to `%s' does" 673 " not match previous GOT addend of %ld"), 674 bfd_get_filename (abfd), rel->r_addend, 675 h->root.root.string, 676 eh->got_addend); 677 678 } 679 } 680 break; 681 682 case R_VAX_PLT32: 683 /* This symbol requires a procedure linkage table entry. We 684 actually build the entry in adjust_dynamic_symbol, 685 because this might be a case of linking PIC code which is 686 never referenced by a dynamic object, in which case we 687 don't need to generate a procedure linkage table entry 688 after all. */ 689 690 /* If this is a local symbol, we resolve it directly without 691 creating a procedure linkage table entry. */ 692 BFD_ASSERT (h != NULL); 693 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT || h->forced_local) 694 break; 695 696 h->needs_plt = 1; 697 if (h->plt.refcount == -1) 698 h->plt.refcount = 1; 699 else 700 h->plt.refcount++; 701 break; 702 703 case R_VAX_PC8: 704 case R_VAX_PC16: 705 case R_VAX_PC32: 706 /* If we are creating a shared library and this is not a local 707 symbol, we need to copy the reloc into the shared library. 708 However when linking with -Bsymbolic and this is a global 709 symbol which is defined in an object we are including in the 710 link (i.e., DEF_REGULAR is set), then we can resolve the 711 reloc directly. At this point we have not seen all the input 712 files, so it is possible that DEF_REGULAR is not set now but 713 will be set later (it is never cleared). We account for that 714 possibility below by storing information in the 715 pcrel_relocs_copied field of the hash table entry. */ 716 if (!(info->shared 717 && (sec->flags & SEC_ALLOC) != 0 718 && h != NULL 719 && (!info->symbolic 720 || !h->def_regular))) 721 { 722 if (h != NULL 723 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 724 && !h->forced_local) 725 { 726 /* Make sure a plt entry is created for this symbol if 727 it turns out to be a function defined by a dynamic 728 object. */ 729 if (h->plt.refcount == -1) 730 h->plt.refcount = 1; 731 else 732 h->plt.refcount++; 733 } 734 break; 735 } 736 /* If this is a local symbol, we can resolve it directly. */ 737 if (h != NULL 738 && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 739 || h->forced_local)) 740 break; 741 742 /* Fall through. */ 743 case R_VAX_8: 744 case R_VAX_16: 745 case R_VAX_32: 746 if (h != NULL && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) 747 { 748 /* Make sure a plt entry is created for this symbol if it 749 turns out to be a function defined by a dynamic object. */ 750 if (h->plt.refcount == -1) 751 h->plt.refcount = 1; 752 else 753 h->plt.refcount++; 754 } 755 756 /* If we are creating a shared library, we need to copy the 757 reloc into the shared library. */ 758 if (info->shared 759 && (sec->flags & SEC_ALLOC) != 0) 760 { 761 /* When creating a shared object, we must copy these 762 reloc types into the output file. We create a reloc 763 section in dynobj and make room for this reloc. */ 764 if (sreloc == NULL) 765 { 766 sreloc = _bfd_elf_make_dynamic_reloc_section 767 (sec, dynobj, 2, abfd, /*rela?*/ TRUE); 768 769 if (sreloc == NULL) 770 return FALSE; 771 772 #if 0 773 BFD_ASSERT (CONST_STRNEQ (name, ".rela") 774 && strcmp (bfd_get_section_name (abfd, sec), 775 name + 5) == 0); 776 777 sreloc = bfd_get_section_by_name (dynobj, name); 778 if (sreloc == NULL) 779 { 780 sreloc = bfd_make_section_with_flags (dynobj, 781 name, 782 (SEC_ALLOC 783 | SEC_LOAD 784 | SEC_HAS_CONTENTS 785 | SEC_IN_MEMORY 786 | SEC_LINKER_CREATED 787 | SEC_READONLY)); 788 if (sreloc == NULL 789 || !bfd_set_section_alignment (dynobj, sreloc, 2)) 790 return FALSE; 791 } 792 #endif 793 794 if (sec->flags & SEC_READONLY) 795 info->flags |= DF_TEXTREL; 796 } 797 798 sreloc->size += sizeof (Elf32_External_Rela); 799 800 /* If we are linking with -Bsymbolic, we count the number of 801 PC relative relocations we have entered for this symbol, 802 so that we can discard them again if the symbol is later 803 defined by a regular object. Note that this function is 804 only called if we are using a vaxelf linker hash table, 805 which means that h is really a pointer to an 806 elf_vax_link_hash_entry. */ 807 if ((ELF32_R_TYPE (rel->r_info) == R_VAX_PC8 808 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC16 809 || ELF32_R_TYPE (rel->r_info) == R_VAX_PC32) 810 && info->symbolic) 811 { 812 struct elf_vax_link_hash_entry *eh; 813 struct elf_vax_pcrel_relocs_copied *p; 814 815 eh = (struct elf_vax_link_hash_entry *) h; 816 817 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) 818 if (p->section == sreloc) 819 break; 820 821 if (p == NULL) 822 { 823 p = ((struct elf_vax_pcrel_relocs_copied *) 824 bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); 825 if (p == NULL) 826 return FALSE; 827 p->next = eh->pcrel_relocs_copied; 828 eh->pcrel_relocs_copied = p; 829 p->section = sreloc; 830 p->count = 0; 831 } 832 833 ++p->count; 834 } 835 } 836 837 break; 838 839 /* This relocation describes the C++ object vtable hierarchy. 840 Reconstruct it for later use during GC. */ 841 case R_VAX_GNU_VTINHERIT: 842 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 843 return FALSE; 844 break; 845 846 /* This relocation describes which C++ vtable entries are actually 847 used. Record for later use during GC. */ 848 case R_VAX_GNU_VTENTRY: 849 BFD_ASSERT (h != NULL); 850 if (h != NULL 851 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 852 return FALSE; 853 break; 854 855 default: 856 break; 857 } 858 } 859 860 return TRUE; 861 } 862 863 /* Return the section that should be marked against GC for a given 864 relocation. */ 865 866 static asection * 867 elf_vax_gc_mark_hook (asection *sec, 868 struct bfd_link_info *info, 869 Elf_Internal_Rela *rel, 870 struct elf_link_hash_entry *h, 871 Elf_Internal_Sym *sym) 872 { 873 if (h != NULL) 874 switch (ELF32_R_TYPE (rel->r_info)) 875 { 876 case R_VAX_GNU_VTINHERIT: 877 case R_VAX_GNU_VTENTRY: 878 return NULL; 879 } 880 881 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 882 } 883 884 /* Update the got entry reference counts for the section being removed. */ 885 886 static bfd_boolean 887 elf_vax_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, asection *sec, 888 const Elf_Internal_Rela *relocs) 889 { 890 Elf_Internal_Shdr *symtab_hdr; 891 struct elf_link_hash_entry **sym_hashes; 892 const Elf_Internal_Rela *rel, *relend; 893 bfd *dynobj; 894 895 if (info->relocatable) 896 return TRUE; 897 898 dynobj = elf_hash_table (info)->dynobj; 899 if (dynobj == NULL) 900 return TRUE; 901 902 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 903 sym_hashes = elf_sym_hashes (abfd); 904 905 relend = relocs + sec->reloc_count; 906 for (rel = relocs; rel < relend; rel++) 907 { 908 unsigned long r_symndx; 909 struct elf_link_hash_entry *h = NULL; 910 911 r_symndx = ELF32_R_SYM (rel->r_info); 912 if (r_symndx >= symtab_hdr->sh_info) 913 { 914 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 915 while (h->root.type == bfd_link_hash_indirect 916 || h->root.type == bfd_link_hash_warning) 917 h = (struct elf_link_hash_entry *) h->root.u.i.link; 918 } 919 920 switch (ELF32_R_TYPE (rel->r_info)) 921 { 922 case R_VAX_GOT32: 923 if (h != NULL && h->got.refcount > 0) 924 --h->got.refcount; 925 break; 926 927 case R_VAX_PLT32: 928 case R_VAX_PC8: 929 case R_VAX_PC16: 930 case R_VAX_PC32: 931 case R_VAX_8: 932 case R_VAX_16: 933 case R_VAX_32: 934 if (h != NULL && h->plt.refcount > 0) 935 --h->plt.refcount; 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; 959 960 dynobj = elf_hash_table (info)->dynobj; 961 962 /* Make sure we know what is going on here. */ 963 BFD_ASSERT (dynobj != NULL 964 && (h->needs_plt 965 || h->u.weakdef != NULL 966 || (h->def_dynamic 967 && h->ref_regular 968 && !h->def_regular))); 969 970 /* If this is a function, put it in the procedure linkage table. We 971 will fill in the contents of the procedure linkage table later, 972 when we know the address of the .got section. */ 973 if (h->type == STT_FUNC 974 || h->needs_plt) 975 { 976 if (! info->shared 977 && !h->def_dynamic 978 && !h->ref_dynamic 979 /* We must always create the plt entry if it was referenced 980 by a PLTxxO relocation. In this case we already recorded 981 it as a dynamic symbol. */ 982 && h->dynindx == -1) 983 { 984 /* This case can occur if we saw a PLTxx reloc in an input 985 file, but the symbol was never referred to by a dynamic 986 object. In such a case, we don't actually need to build 987 a procedure linkage table, and we can just do a PCxx 988 reloc instead. */ 989 BFD_ASSERT (h->needs_plt); 990 h->plt.offset = (bfd_vma) -1; 991 return TRUE; 992 } 993 994 /* GC may have rendered this entry unused. */ 995 if (h->plt.refcount <= 0) 996 { 997 h->needs_plt = 0; 998 h->plt.offset = (bfd_vma) -1; 999 return TRUE; 1000 } 1001 1002 /* Make sure this symbol is output as a dynamic symbol. */ 1003 if (h->dynindx == -1) 1004 { 1005 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1006 return FALSE; 1007 } 1008 1009 s = bfd_get_section_by_name (dynobj, ".plt"); 1010 BFD_ASSERT (s != NULL); 1011 1012 /* If this is the first .plt entry, make room for the special 1013 first entry. */ 1014 if (s->size == 0) 1015 { 1016 s->size += PLT_ENTRY_SIZE; 1017 } 1018 1019 /* If this symbol is not defined in a regular file, and we are 1020 not generating a shared library, then set the symbol to this 1021 location in the .plt. This is required to make function 1022 pointers compare as equal between the normal executable and 1023 the shared library. */ 1024 if (!info->shared 1025 && !h->def_regular) 1026 { 1027 h->root.u.def.section = s; 1028 h->root.u.def.value = s->size; 1029 } 1030 1031 h->plt.offset = s->size; 1032 1033 /* Make room for this entry. */ 1034 s->size += PLT_ENTRY_SIZE; 1035 1036 /* We also need to make an entry in the .got.plt section, which 1037 will be placed in the .got section by the linker script. */ 1038 1039 s = bfd_get_section_by_name (dynobj, ".got.plt"); 1040 BFD_ASSERT (s != NULL); 1041 s->size += 4; 1042 1043 /* We also need to make an entry in the .rela.plt section. */ 1044 1045 s = bfd_get_section_by_name (dynobj, ".rela.plt"); 1046 BFD_ASSERT (s != NULL); 1047 s->size += sizeof (Elf32_External_Rela); 1048 1049 return TRUE; 1050 } 1051 1052 /* Reinitialize the plt offset now that it is not used as a reference 1053 count any more. */ 1054 h->plt.offset = (bfd_vma) -1; 1055 1056 /* If this is a weak symbol, and there is a real definition, the 1057 processor independent code will have arranged for us to see the 1058 real definition first, and we can just use the same value. */ 1059 if (h->u.weakdef != NULL) 1060 { 1061 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1062 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1063 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1064 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1065 return TRUE; 1066 } 1067 1068 /* This is a reference to a symbol defined by a dynamic object which 1069 is not a function. */ 1070 1071 /* If we are creating a shared library, we must presume that the 1072 only references to the symbol are via the global offset table. 1073 For such cases we need not do anything here; the relocations will 1074 be handled correctly by relocate_section. */ 1075 if (info->shared) 1076 return TRUE; 1077 1078 if (h->size == 0) 1079 { 1080 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 1081 h->root.root.string); 1082 return TRUE; 1083 } 1084 1085 /* We must allocate the symbol in our .dynbss section, which will 1086 become part of the .bss section of the executable. There will be 1087 an entry for this symbol in the .dynsym section. The dynamic 1088 object will contain position independent code, so all references 1089 from the dynamic object to this symbol will go through the global 1090 offset table. The dynamic linker will use the .dynsym entry to 1091 determine the address it must put in the global offset table, so 1092 both the dynamic object and the regular object will refer to the 1093 same memory location for the variable. */ 1094 1095 s = bfd_get_section_by_name (dynobj, ".dynbss"); 1096 BFD_ASSERT (s != NULL); 1097 1098 /* We must generate a R_VAX_COPY reloc to tell the dynamic linker to 1099 copy the initial value out of the dynamic object and into the 1100 runtime process image. We need to remember the offset into the 1101 .rela.bss section we are going to use. */ 1102 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1103 { 1104 asection *srel; 1105 1106 srel = bfd_get_section_by_name (dynobj, ".rela.bss"); 1107 BFD_ASSERT (srel != NULL); 1108 srel->size += sizeof (Elf32_External_Rela); 1109 h->needs_copy = 1; 1110 } 1111 1112 return _bfd_elf_adjust_dynamic_copy (h, s); 1113 } 1114 1115 /* Set the sizes of the dynamic sections. */ 1116 1117 static bfd_boolean 1118 elf_vax_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 1119 { 1120 bfd *dynobj; 1121 asection *s; 1122 bfd_boolean plt; 1123 bfd_boolean relocs; 1124 bfd_boolean reltext; 1125 1126 dynobj = elf_hash_table (info)->dynobj; 1127 BFD_ASSERT (dynobj != NULL); 1128 1129 if (elf_hash_table (info)->dynamic_sections_created) 1130 { 1131 /* Set the contents of the .interp section to the interpreter. */ 1132 if (info->executable) 1133 { 1134 s = bfd_get_section_by_name (dynobj, ".interp"); 1135 BFD_ASSERT (s != NULL); 1136 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1137 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1138 } 1139 } 1140 else 1141 { 1142 /* We may have created entries in the .rela.got and .got sections. 1143 However, if we are not creating the dynamic sections, we will 1144 not actually use these entries. Reset the size of .rela.got 1145 and .got, which will cause it to get stripped from the output 1146 file below. */ 1147 s = bfd_get_section_by_name (dynobj, ".rela.got"); 1148 if (s != NULL) 1149 s->size = 0; 1150 s = bfd_get_section_by_name (dynobj, ".got.plt"); 1151 if (s != NULL) 1152 s->size = 0; 1153 s = bfd_get_section_by_name (dynobj, ".got"); 1154 if (s != NULL) 1155 s->size = 0; 1156 } 1157 1158 /* If this is a -Bsymbolic shared link, then we need to discard all PC 1159 relative relocs against symbols defined in a regular object. We 1160 allocated space for them in the check_relocs routine, but we will not 1161 fill them in in the relocate_section routine. */ 1162 if (info->shared && info->symbolic) 1163 elf_vax_link_hash_traverse (elf_hash_table (info), 1164 elf_vax_discard_copies, 1165 NULL); 1166 1167 /* If this is a -Bsymbolic shared link or a static link, we need to 1168 discard all the got entries we've recorded. Otherwise, we need to 1169 instantiate (allocate space for them). */ 1170 elf_link_hash_traverse (elf_hash_table (info), 1171 elf_vax_instantiate_got_entries, 1172 (PTR) info); 1173 1174 /* The check_relocs and adjust_dynamic_symbol entry points have 1175 determined the sizes of the various dynamic sections. Allocate 1176 memory for them. */ 1177 plt = FALSE; 1178 relocs = FALSE; 1179 reltext = FALSE; 1180 for (s = dynobj->sections; s != NULL; s = s->next) 1181 { 1182 const char *name; 1183 1184 if ((s->flags & SEC_LINKER_CREATED) == 0) 1185 continue; 1186 1187 /* It's OK to base decisions on the section name, because none 1188 of the dynobj section names depend upon the input files. */ 1189 name = bfd_get_section_name (dynobj, s); 1190 1191 if (strcmp (name, ".plt") == 0) 1192 { 1193 /* Remember whether there is a PLT. */ 1194 plt = s->size != 0; 1195 } 1196 else if (CONST_STRNEQ (name, ".rela")) 1197 { 1198 if (s->size != 0) 1199 { 1200 asection *target; 1201 1202 /* Remember whether there are any reloc sections other 1203 than .rela.plt. */ 1204 if (strcmp (name, ".rela.plt") != 0) 1205 { 1206 const char *outname; 1207 1208 relocs = TRUE; 1209 1210 /* If this relocation section applies to a read only 1211 section, then we probably need a DT_TEXTREL 1212 entry. .rela.plt is actually associated with 1213 .got.plt, which is never readonly. */ 1214 outname = bfd_get_section_name (output_bfd, 1215 s->output_section); 1216 target = bfd_get_section_by_name (output_bfd, outname + 5); 1217 if (target != NULL 1218 && (target->flags & SEC_READONLY) != 0 1219 && (target->flags & SEC_ALLOC) != 0) 1220 reltext = TRUE; 1221 } 1222 1223 /* We use the reloc_count field as a counter if we need 1224 to copy relocs into the output file. */ 1225 s->reloc_count = 0; 1226 } 1227 } 1228 else if (! CONST_STRNEQ (name, ".got") 1229 && strcmp (name, ".dynbss") != 0) 1230 { 1231 /* It's not one of our sections, so don't allocate space. */ 1232 continue; 1233 } 1234 1235 if (s->size == 0) 1236 { 1237 /* If we don't need this section, strip it from the 1238 output file. This is mostly to handle .rela.bss and 1239 .rela.plt. We must create both sections in 1240 create_dynamic_sections, because they must be created 1241 before the linker maps input sections to output 1242 sections. The linker does that before 1243 adjust_dynamic_symbol is called, and it is that 1244 function which decides whether anything needs to go 1245 into these sections. */ 1246 s->flags |= SEC_EXCLUDE; 1247 continue; 1248 } 1249 1250 if ((s->flags & SEC_HAS_CONTENTS) == 0) 1251 continue; 1252 1253 /* Allocate memory for the section contents. */ 1254 /* FIXME: This should be a call to bfd_alloc not bfd_zalloc. 1255 Unused entries should be reclaimed before the section's contents 1256 are written out, but at the moment this does not happen. Thus in 1257 order to prevent writing out garbage, we initialise the section's 1258 contents to zero. */ 1259 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 1260 if (s->contents == NULL) 1261 return FALSE; 1262 } 1263 1264 if (elf_hash_table (info)->dynamic_sections_created) 1265 { 1266 /* Add some entries to the .dynamic section. We fill in the 1267 values later, in elf_vax_finish_dynamic_sections, but we 1268 must add the entries now so that we get the correct size for 1269 the .dynamic section. The DT_DEBUG entry is filled in by the 1270 dynamic linker and used by the debugger. */ 1271 #define add_dynamic_entry(TAG, VAL) \ 1272 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 1273 1274 if (!info->shared) 1275 { 1276 if (!add_dynamic_entry (DT_DEBUG, 0)) 1277 return FALSE; 1278 } 1279 1280 if (plt) 1281 { 1282 if (!add_dynamic_entry (DT_PLTGOT, 0) 1283 || !add_dynamic_entry (DT_PLTRELSZ, 0) 1284 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 1285 || !add_dynamic_entry (DT_JMPREL, 0)) 1286 return FALSE; 1287 } 1288 1289 if (relocs) 1290 { 1291 if (!add_dynamic_entry (DT_RELA, 0) 1292 || !add_dynamic_entry (DT_RELASZ, 0) 1293 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) 1294 return FALSE; 1295 } 1296 1297 if (reltext || (info->flags & DF_TEXTREL) != 0) 1298 { 1299 if (!add_dynamic_entry (DT_TEXTREL, 0)) 1300 return FALSE; 1301 } 1302 } 1303 #undef add_dynamic_entry 1304 1305 return TRUE; 1306 } 1307 1308 /* This function is called via elf_vax_link_hash_traverse if we are 1309 creating a shared object with -Bsymbolic. It discards the space 1310 allocated to copy PC relative relocs against symbols which are defined 1311 in regular objects. We allocated space for them in the check_relocs 1312 routine, but we won't fill them in in the relocate_section routine. */ 1313 1314 static bfd_boolean 1315 elf_vax_discard_copies (struct elf_vax_link_hash_entry *h, 1316 PTR ignore ATTRIBUTE_UNUSED) 1317 { 1318 struct elf_vax_pcrel_relocs_copied *s; 1319 1320 if (h->root.root.type == bfd_link_hash_warning) 1321 h = (struct elf_vax_link_hash_entry *) h->root.root.u.i.link; 1322 1323 /* We only discard relocs for symbols defined in a regular object. */ 1324 if (!h->root.def_regular) 1325 return TRUE; 1326 1327 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) 1328 s->section->size -= s->count * sizeof (Elf32_External_Rela); 1329 1330 return TRUE; 1331 } 1332 1333 /* This function is called via elf_link_hash_traverse. It looks for entries 1334 that have GOT or PLT (.GOT) references. If creating a static object or a 1335 shared object with -Bsymbolic, it resets the reference count back to 0 1336 and sets the offset to -1 so normal PC32 relocation will be done. If 1337 creating a shared object or executable, space in the .got and .rela.got 1338 will be reserved for the symbol. */ 1339 1340 static bfd_boolean 1341 elf_vax_instantiate_got_entries (struct elf_link_hash_entry *h, PTR infoptr) 1342 { 1343 struct bfd_link_info *info = (struct bfd_link_info *) infoptr; 1344 bfd *dynobj; 1345 asection *sgot; 1346 asection *srelgot; 1347 1348 /* We don't care about non-GOT (and non-PLT) entries. */ 1349 if (h->got.refcount <= 0 && h->plt.refcount <= 0) 1350 return TRUE; 1351 1352 dynobj = elf_hash_table (info)->dynobj; 1353 if (dynobj == NULL) 1354 return TRUE; 1355 1356 sgot = bfd_get_section_by_name (dynobj, ".got"); 1357 srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); 1358 1359 if (!elf_hash_table (info)->dynamic_sections_created 1360 || (info->shared && info->symbolic) 1361 || h->forced_local) 1362 { 1363 h->got.refcount = 0; 1364 h->got.offset = (bfd_vma) -1; 1365 h->plt.refcount = 0; 1366 h->plt.offset = (bfd_vma) -1; 1367 } 1368 else if (h->got.refcount > 0) 1369 { 1370 bfd_boolean dyn; 1371 1372 /* Make sure this symbol is output as a dynamic symbol. */ 1373 if (h->dynindx == -1) 1374 { 1375 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 1376 return FALSE; 1377 } 1378 1379 dyn = elf_hash_table (info)->dynamic_sections_created; 1380 /* Allocate space in the .got and .rela.got sections. */ 1381 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1382 && (info->shared 1383 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1384 { 1385 sgot->size += 4; 1386 srelgot->size += sizeof (Elf32_External_Rela); 1387 } 1388 } 1389 1390 return TRUE; 1391 } 1392 1393 /* Relocate an VAX ELF section. */ 1394 1395 static bfd_boolean 1396 elf_vax_relocate_section (bfd *output_bfd, 1397 struct bfd_link_info *info, 1398 bfd *input_bfd, 1399 asection *input_section, 1400 bfd_byte *contents, 1401 Elf_Internal_Rela *relocs, 1402 Elf_Internal_Sym *local_syms, 1403 asection **local_sections) 1404 { 1405 bfd *dynobj; 1406 Elf_Internal_Shdr *symtab_hdr; 1407 struct elf_link_hash_entry **sym_hashes; 1408 bfd_vma plt_index; 1409 bfd_vma got_offset; 1410 asection *sgot; 1411 asection *splt; 1412 asection *sgotplt; 1413 asection *sreloc; 1414 Elf_Internal_Rela *rel; 1415 Elf_Internal_Rela *relend; 1416 1417 dynobj = elf_hash_table (info)->dynobj; 1418 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1419 sym_hashes = elf_sym_hashes (input_bfd); 1420 1421 sgot = NULL; 1422 splt = NULL; 1423 sgotplt = NULL; 1424 sreloc = NULL; 1425 1426 rel = relocs; 1427 relend = relocs + input_section->reloc_count; 1428 for (; rel < relend; rel++) 1429 { 1430 int r_type; 1431 reloc_howto_type *howto; 1432 unsigned long r_symndx; 1433 struct elf_link_hash_entry *h; 1434 Elf_Internal_Sym *sym; 1435 asection *sec; 1436 bfd_vma relocation; 1437 bfd_reloc_status_type r; 1438 1439 r_type = ELF32_R_TYPE (rel->r_info); 1440 if (r_type < 0 || r_type >= (int) R_VAX_max) 1441 { 1442 bfd_set_error (bfd_error_bad_value); 1443 return FALSE; 1444 } 1445 howto = howto_table + r_type; 1446 1447 r_symndx = ELF32_R_SYM (rel->r_info); 1448 h = NULL; 1449 sym = NULL; 1450 sec = NULL; 1451 if (r_symndx < symtab_hdr->sh_info) 1452 { 1453 sym = local_syms + r_symndx; 1454 sec = local_sections[r_symndx]; 1455 #if 0 /* XXXMRG */ 1456 relocation = (sec->output_section->vma 1457 + sec->output_offset 1458 + sym->st_value); 1459 #else 1460 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1461 #endif 1462 } 1463 else 1464 { 1465 bfd_boolean unresolved_reloc; 1466 bfd_boolean warned; 1467 1468 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1469 r_symndx, symtab_hdr, sym_hashes, 1470 h, sec, relocation, 1471 unresolved_reloc, warned); 1472 1473 if ((h->root.type == bfd_link_hash_defined 1474 || h->root.type == bfd_link_hash_defweak) 1475 && ((r_type == R_VAX_PLT32 1476 && h->plt.offset != (bfd_vma) -1 1477 && !h->forced_local 1478 && elf_hash_table (info)->dynamic_sections_created) 1479 || (r_type == R_VAX_GOT32 1480 && h->got.offset != (bfd_vma) -1 1481 && !h->forced_local 1482 && elf_hash_table (info)->dynamic_sections_created 1483 && (! info->shared 1484 || (! info->symbolic && h->dynindx != -1) 1485 || !h->def_regular)) 1486 || (info->shared 1487 && ((! info->symbolic && h->dynindx != -1) 1488 || !h->def_regular) 1489 && ((input_section->flags & SEC_ALLOC) != 0 1490 /* DWARF will emit R_VAX_32 relocations in its 1491 sections against symbols defined externally 1492 in shared libraries. We can't do anything 1493 with them here. */ 1494 1495 || ((input_section->flags & SEC_DEBUGGING) != 0 1496 && h->def_dynamic)) 1497 && (r_type == R_VAX_8 1498 || r_type == R_VAX_16 1499 || r_type == R_VAX_32)))) 1500 /* In these cases, we don't need the relocation 1501 value. We check specially because in some 1502 obscure cases sec->output_section will be NULL. */ 1503 relocation = 0; 1504 } 1505 1506 if (sec != NULL && elf_discarded_section (sec)) 1507 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1508 rel, relend, howto, contents); 1509 1510 if (info->relocatable) 1511 continue; 1512 1513 switch (r_type) 1514 { 1515 case R_VAX_GOT32: 1516 /* Relocation is to the address of the entry for this symbol 1517 in the global offset table. */ 1518 if (h == NULL 1519 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1520 || h->got.offset == (bfd_vma) -1 1521 || h->forced_local) 1522 break; 1523 1524 /* Relocation is the offset of the entry for this symbol in 1525 the global offset table. */ 1526 1527 { 1528 bfd_boolean dyn; 1529 bfd_vma off; 1530 1531 if (sgot == NULL) 1532 { 1533 sgot = bfd_get_section_by_name (dynobj, ".got"); 1534 BFD_ASSERT (sgot != NULL); 1535 } 1536 1537 BFD_ASSERT (h != NULL); 1538 off = h->got.offset; 1539 BFD_ASSERT (off != (bfd_vma) -1); 1540 BFD_ASSERT (off < sgot->size); 1541 1542 dyn = elf_hash_table (info)->dynamic_sections_created; 1543 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 1544 || (info->shared 1545 && SYMBOL_REFERENCES_LOCAL (info, h))) 1546 { 1547 /* The symbol was forced to be local 1548 because of a version file.. We must initialize 1549 this entry in the global offset table. Since 1550 the offset must always be a multiple of 4, we 1551 use the least significant bit to record whether 1552 we have initialized it already. 1553 1554 When doing a dynamic link, we create a .rela.got 1555 relocation entry to initialize the value. This 1556 is done in the finish_dynamic_symbol routine. */ 1557 if ((off & 1) != 0) 1558 off &= ~1; 1559 else 1560 { 1561 bfd_put_32 (output_bfd, relocation + rel->r_addend, 1562 sgot->contents + off); 1563 h->got.offset |= 1; 1564 } 1565 } else { 1566 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off); 1567 } 1568 1569 relocation = sgot->output_offset + off; 1570 /* The GOT relocation uses the addend. */ 1571 rel->r_addend = 0; 1572 1573 /* Change the reference to be indirect. */ 1574 contents[rel->r_offset - 1] |= 0x10; 1575 relocation += sgot->output_section->vma; 1576 } 1577 break; 1578 1579 case R_VAX_PC32: 1580 /* If we are creating an executable and the function this 1581 reloc refers to is in a shared lib, then we made a PLT 1582 entry for this symbol and need to handle the reloc like 1583 a PLT reloc. */ 1584 if (info->shared) 1585 goto r_vax_pc32_shared; 1586 /* Fall through. */ 1587 case R_VAX_PLT32: 1588 /* Relocation is to the entry for this symbol in the 1589 procedure linkage table. */ 1590 1591 /* Resolve a PLTxx reloc against a local symbol directly, 1592 without using the procedure linkage table. */ 1593 if (h == NULL 1594 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1595 || h->forced_local) 1596 break; 1597 1598 if (h->plt.offset == (bfd_vma) -1 1599 || h->forced_local 1600 || !elf_hash_table (info)->dynamic_sections_created) 1601 { 1602 /* We didn't make a PLT entry for this symbol. This 1603 happens when statically linking PIC code, or when 1604 using -Bsymbolic. */ 1605 break; 1606 } 1607 1608 if (splt == NULL) 1609 { 1610 splt = bfd_get_section_by_name (dynobj, ".plt"); 1611 BFD_ASSERT (splt != NULL); 1612 } 1613 1614 if (sgotplt == NULL) 1615 { 1616 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 1617 BFD_ASSERT (sgotplt != NULL); 1618 } 1619 1620 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1621 1622 /* Get the offset into the .got table of the entry that 1623 corresponds to this function. Each .got entry is 4 bytes. 1624 The first two are reserved. */ 1625 got_offset = (plt_index + 3) * 4; 1626 1627 /* We want the relocation to point into the .got.plt instead 1628 of the plt itself. */ 1629 relocation = (sgotplt->output_section->vma 1630 + sgotplt->output_offset 1631 + got_offset); 1632 contents[rel->r_offset-1] |= 0x10; /* make indirect */ 1633 if (rel->r_addend == 2) 1634 { 1635 h->plt.offset |= 1; 1636 } 1637 else if (rel->r_addend != 0) 1638 (*_bfd_error_handler) 1639 (_("%s: warning: PLT addend of %d to `%s' from %s section ignored"), 1640 bfd_get_filename (input_bfd), rel->r_addend, 1641 h->root.root.string, 1642 bfd_get_section_name (input_bfd, input_section)); 1643 rel->r_addend = 0; 1644 1645 break; 1646 1647 case R_VAX_PC8: 1648 case R_VAX_PC16: 1649 r_vax_pc32_shared: 1650 if (h == NULL 1651 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1652 || h->forced_local) 1653 break; 1654 /* Fall through. */ 1655 case R_VAX_8: 1656 case R_VAX_16: 1657 case R_VAX_32: 1658 if (info->shared 1659 && r_symndx != STN_UNDEF 1660 && (input_section->flags & SEC_ALLOC) != 0 1661 && ((r_type != R_VAX_PC8 1662 && r_type != R_VAX_PC16 1663 && r_type != R_VAX_PC32) 1664 || ((input_section->flags & SEC_CODE) != 0 1665 && (!info->symbolic 1666 || (!h->def_regular && h->type != STT_SECTION))))) 1667 { 1668 Elf_Internal_Rela outrel; 1669 bfd_byte *loc; 1670 bfd_boolean skip, relocate; 1671 1672 /* When generating a shared object, these relocations 1673 are copied into the output file to be resolved at run 1674 time. */ 1675 if (sreloc == NULL) 1676 { 1677 sreloc = _bfd_elf_get_dynamic_reloc_section 1678 (input_bfd, input_section, /*rela?*/ TRUE); 1679 if (sreloc == NULL) 1680 return FALSE; 1681 } 1682 1683 skip = FALSE; 1684 relocate = FALSE; 1685 1686 outrel.r_offset = 1687 _bfd_elf_section_offset (output_bfd, info, input_section, 1688 rel->r_offset); 1689 if (outrel.r_offset == (bfd_vma) -1) 1690 skip = TRUE; 1691 if (outrel.r_offset == (bfd_vma) -2) 1692 skip = TRUE, relocate = TRUE; 1693 outrel.r_offset += (input_section->output_section->vma 1694 + input_section->output_offset); 1695 1696 if (skip) 1697 memset (&outrel, 0, sizeof outrel); 1698 /* h->dynindx may be -1 if the symbol was marked to 1699 become local. */ 1700 else if (h != NULL 1701 && ((! info->symbolic && h->dynindx != -1) 1702 || !h->def_regular)) 1703 { 1704 BFD_ASSERT (h->dynindx != -1); 1705 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1706 outrel.r_addend = relocation + rel->r_addend; 1707 } 1708 else 1709 { 1710 if (r_type == R_VAX_32) 1711 { 1712 relocate = TRUE; 1713 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE); 1714 outrel.r_addend = bfd_get_signed_32(input_bfd, 1715 &contents[rel->r_offset]) 1716 + relocation + rel->r_addend; 1717 } 1718 else 1719 { 1720 long indx; 1721 1722 if (bfd_is_abs_section (sec)) 1723 indx = 0; 1724 else if (sec == NULL || sec->owner == NULL) 1725 { 1726 bfd_set_error (bfd_error_bad_value); 1727 return FALSE; 1728 } 1729 else 1730 { 1731 asection *osec; 1732 1733 /* We are turning this relocation into one 1734 against a section symbol. It would be 1735 proper to subtract the symbol's value, 1736 osec->vma, from the emitted reloc addend, 1737 but ld.so expects buggy relocs. */ 1738 osec = sec->output_section; 1739 indx = elf_section_data (osec)->dynindx; 1740 if (indx == 0) 1741 { 1742 struct elf_link_hash_table *htab; 1743 htab = elf_hash_table (info); 1744 osec = htab->text_index_section; 1745 indx = elf_section_data (osec)->dynindx; 1746 } 1747 BFD_ASSERT (indx != 0); 1748 } 1749 1750 outrel.r_info = ELF32_R_INFO (indx, r_type); 1751 outrel.r_addend = relocation + rel->r_addend; 1752 } 1753 } 1754 1755 if (strcmp (bfd_get_section_name (input_bfd, input_section), 1756 ".text") == 0 || 1757 (info->shared 1758 && ELF32_R_TYPE(outrel.r_info) != R_VAX_32 1759 && ELF32_R_TYPE(outrel.r_info) != R_VAX_RELATIVE 1760 && ELF32_R_TYPE(outrel.r_info) != R_VAX_COPY 1761 && ELF32_R_TYPE(outrel.r_info) != R_VAX_JMP_SLOT 1762 && ELF32_R_TYPE(outrel.r_info) != R_VAX_GLOB_DAT)) 1763 { 1764 if (h != NULL) 1765 (*_bfd_error_handler) 1766 (_("%s: warning: %s relocation against symbol `%s' from %s section"), 1767 bfd_get_filename (input_bfd), howto->name, 1768 h->root.root.string, 1769 bfd_get_section_name (input_bfd, input_section)); 1770 else 1771 (*_bfd_error_handler) 1772 (_("%s: warning: %s relocation to 0x%x from %s section"), 1773 bfd_get_filename (input_bfd), howto->name, 1774 outrel.r_addend, 1775 bfd_get_section_name (input_bfd, input_section)); 1776 } 1777 loc = sreloc->contents; 1778 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1779 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1780 1781 /* This reloc will be computed at runtime, so there's no 1782 need to do anything now, except for R_VAX_32 1783 relocations that have been turned into 1784 R_VAX_RELATIVE. */ 1785 if (!relocate) 1786 continue; 1787 } 1788 1789 break; 1790 1791 case R_VAX_GNU_VTINHERIT: 1792 case R_VAX_GNU_VTENTRY: 1793 /* These are no-ops in the end. */ 1794 continue; 1795 1796 default: 1797 break; 1798 } 1799 1800 /* VAX PCREL relocations are from the end of relocation, not the start. 1801 So subtract the difference from the relocation amount since we can't 1802 add it to the offset. */ 1803 if (howto->pc_relative && howto->pcrel_offset) 1804 relocation -= bfd_get_reloc_size(howto); 1805 1806 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1807 contents, rel->r_offset, 1808 relocation, rel->r_addend); 1809 1810 if (r != bfd_reloc_ok) 1811 { 1812 switch (r) 1813 { 1814 default: 1815 case bfd_reloc_outofrange: 1816 abort (); 1817 case bfd_reloc_overflow: 1818 { 1819 const char *name; 1820 1821 if (h != NULL) 1822 name = NULL; 1823 else 1824 { 1825 name = bfd_elf_string_from_elf_section (input_bfd, 1826 symtab_hdr->sh_link, 1827 sym->st_name); 1828 if (name == NULL) 1829 return FALSE; 1830 if (*name == '\0') 1831 name = bfd_section_name (input_bfd, sec); 1832 } 1833 if (!(info->callbacks->reloc_overflow 1834 (info, (h ? &h->root : NULL), name, howto->name, 1835 (bfd_vma) 0, input_bfd, input_section, 1836 rel->r_offset))) 1837 return FALSE; 1838 } 1839 break; 1840 } 1841 } 1842 } 1843 1844 return TRUE; 1845 } 1846 1847 /* Finish up dynamic symbol handling. We set the contents of various 1848 dynamic sections here. */ 1849 1850 static bfd_boolean 1851 elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info, 1852 struct elf_link_hash_entry *h, 1853 Elf_Internal_Sym *sym) 1854 { 1855 bfd *dynobj; 1856 1857 dynobj = elf_hash_table (info)->dynobj; 1858 1859 if (h->plt.offset != (bfd_vma) -1) 1860 { 1861 asection *splt; 1862 asection *sgot; 1863 asection *srela; 1864 bfd_vma plt_index; 1865 bfd_vma got_offset; 1866 bfd_vma addend; 1867 Elf_Internal_Rela rela; 1868 bfd_byte *loc; 1869 1870 /* This symbol has an entry in the procedure linkage table. Set 1871 it up. */ 1872 BFD_ASSERT (h->dynindx != -1); 1873 1874 splt = bfd_get_section_by_name (dynobj, ".plt"); 1875 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 1876 srela = bfd_get_section_by_name (dynobj, ".rela.plt"); 1877 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 1878 1879 addend = 2 * (h->plt.offset & 1); 1880 h->plt.offset &= ~1; 1881 1882 /* Get the index in the procedure linkage table which 1883 corresponds to this symbol. This is the index of this symbol 1884 in all the symbols for which we are making plt entries. The 1885 first entry in the procedure linkage table is reserved. */ 1886 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1887 1888 /* Get the offset into the .got table of the entry that 1889 corresponds to this function. Each .got entry is 4 bytes. 1890 The first two are reserved. */ 1891 got_offset = (plt_index + 3) * 4; 1892 1893 /* Fill in the entry in the procedure linkage table. */ 1894 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry, 1895 PLT_ENTRY_SIZE); 1896 1897 /* The offset is relative to the first extension word. */ 1898 bfd_put_32 (output_bfd, 1899 -(h->plt.offset + 8), 1900 splt->contents + h->plt.offset + 4); 1901 1902 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 1903 splt->contents + h->plt.offset + 8); 1904 1905 /* Fill in the entry in the global offset table. */ 1906 bfd_put_32 (output_bfd, 1907 (splt->output_section->vma 1908 + splt->output_offset 1909 + h->plt.offset) + addend, 1910 sgot->contents + got_offset); 1911 1912 /* Fill in the entry in the .rela.plt section. */ 1913 rela.r_offset = (sgot->output_section->vma 1914 + sgot->output_offset 1915 + got_offset); 1916 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT); 1917 rela.r_addend = addend; 1918 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 1919 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1920 1921 if (!h->def_regular) 1922 { 1923 /* Mark the symbol as undefined, rather than as defined in 1924 the .plt section. Leave the value alone. */ 1925 sym->st_shndx = SHN_UNDEF; 1926 } 1927 } 1928 1929 if (h->got.offset != (bfd_vma) -1) 1930 { 1931 asection *sgot; 1932 asection *srela; 1933 Elf_Internal_Rela rela; 1934 bfd_byte *loc; 1935 1936 /* This symbol has an entry in the global offset table. Set it 1937 up. */ 1938 sgot = bfd_get_section_by_name (dynobj, ".got"); 1939 srela = bfd_get_section_by_name (dynobj, ".rela.got"); 1940 BFD_ASSERT (sgot != NULL && srela != NULL); 1941 1942 rela.r_offset = (sgot->output_section->vma 1943 + sgot->output_offset 1944 + (h->got.offset &~ 1)); 1945 1946 /* If the symbol was forced to be local because of a version file 1947 locally we just want to emit a RELATIVE reloc. The entry in 1948 the global offset table will already have been initialized in 1949 the relocate_section function. */ 1950 if (info->shared 1951 && h->dynindx == -1 1952 && h->def_regular) 1953 { 1954 rela.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE); 1955 } 1956 else 1957 { 1958 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT); 1959 } 1960 rela.r_addend = bfd_get_signed_32 (output_bfd, 1961 (sgot->contents 1962 + (h->got.offset & ~1))); 1963 1964 loc = srela->contents; 1965 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 1966 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1967 } 1968 1969 if (h->needs_copy) 1970 { 1971 asection *s; 1972 Elf_Internal_Rela rela; 1973 bfd_byte *loc; 1974 1975 /* This symbol needs a copy reloc. Set it up. */ 1976 BFD_ASSERT (h->dynindx != -1 1977 && (h->root.type == bfd_link_hash_defined 1978 || h->root.type == bfd_link_hash_defweak)); 1979 1980 s = bfd_get_section_by_name (h->root.u.def.section->owner, 1981 ".rela.bss"); 1982 BFD_ASSERT (s != NULL); 1983 1984 rela.r_offset = (h->root.u.def.value 1985 + h->root.u.def.section->output_section->vma 1986 + h->root.u.def.section->output_offset); 1987 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY); 1988 rela.r_addend = 0; 1989 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 1990 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1991 } 1992 1993 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 1994 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 1995 || h == elf_hash_table (info)->hgot) 1996 sym->st_shndx = SHN_ABS; 1997 1998 return TRUE; 1999 } 2000 2001 /* Finish up the dynamic sections. */ 2002 2003 static bfd_boolean 2004 elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 2005 { 2006 bfd *dynobj; 2007 asection *sgot; 2008 asection *sdyn; 2009 2010 dynobj = elf_hash_table (info)->dynobj; 2011 2012 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 2013 BFD_ASSERT (sgot != NULL); 2014 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 2015 2016 if (elf_hash_table (info)->dynamic_sections_created) 2017 { 2018 asection *splt; 2019 Elf32_External_Dyn *dyncon, *dynconend; 2020 2021 splt = bfd_get_section_by_name (dynobj, ".plt"); 2022 BFD_ASSERT (splt != NULL && sdyn != NULL); 2023 2024 dyncon = (Elf32_External_Dyn *) sdyn->contents; 2025 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 2026 for (; dyncon < dynconend; dyncon++) 2027 { 2028 Elf_Internal_Dyn dyn; 2029 const char *name; 2030 asection *s; 2031 2032 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 2033 2034 switch (dyn.d_tag) 2035 { 2036 default: 2037 break; 2038 2039 case DT_PLTGOT: 2040 name = ".got"; 2041 goto get_vma; 2042 case DT_JMPREL: 2043 name = ".rela.plt"; 2044 get_vma: 2045 s = bfd_get_section_by_name (output_bfd, name); 2046 BFD_ASSERT (s != NULL); 2047 dyn.d_un.d_ptr = s->vma; 2048 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2049 break; 2050 2051 case DT_PLTRELSZ: 2052 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2053 BFD_ASSERT (s != NULL); 2054 dyn.d_un.d_val = s->size; 2055 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2056 break; 2057 2058 case DT_RELASZ: 2059 /* The procedure linkage table relocs (DT_JMPREL) should 2060 not be included in the overall relocs (DT_RELA). 2061 Therefore, we override the DT_RELASZ entry here to 2062 make it not include the JMPREL relocs. Since the 2063 linker script arranges for .rela.plt to follow all 2064 other relocation sections, we don't have to worry 2065 about changing the DT_RELA entry. */ 2066 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2067 if (s != NULL) 2068 dyn.d_un.d_val -= s->size; 2069 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2070 break; 2071 } 2072 } 2073 2074 /* Fill in the first entry in the procedure linkage table. */ 2075 if (splt->size > 0) 2076 { 2077 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE); 2078 bfd_put_32 (output_bfd, 2079 (sgot->output_section->vma 2080 + sgot->output_offset + 4 2081 - (splt->output_section->vma + 6)), 2082 splt->contents + 2); 2083 bfd_put_32 (output_bfd, 2084 (sgot->output_section->vma 2085 + sgot->output_offset + 8 2086 - (splt->output_section->vma + 12)), 2087 splt->contents + 8); 2088 elf_section_data (splt->output_section)->this_hdr.sh_entsize 2089 = PLT_ENTRY_SIZE; 2090 } 2091 } 2092 2093 /* Fill in the first three entries in the global offset table. */ 2094 if (sgot->size > 0) 2095 { 2096 if (sdyn == NULL) 2097 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 2098 else 2099 bfd_put_32 (output_bfd, 2100 sdyn->output_section->vma + sdyn->output_offset, 2101 sgot->contents); 2102 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 2103 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 2104 } 2105 2106 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2107 2108 return TRUE; 2109 } 2110 2111 static enum elf_reloc_type_class 2112 elf_vax_reloc_type_class (const Elf_Internal_Rela *rela) 2113 { 2114 switch ((int) ELF32_R_TYPE (rela->r_info)) 2115 { 2116 case R_VAX_RELATIVE: 2117 return reloc_class_relative; 2118 case R_VAX_JMP_SLOT: 2119 return reloc_class_plt; 2120 case R_VAX_COPY: 2121 return reloc_class_copy; 2122 default: 2123 return reloc_class_normal; 2124 } 2125 } 2126 2127 static bfd_vma 2128 elf_vax_plt_sym_val (bfd_vma i, const asection *plt, 2129 const arelent *rel ATTRIBUTE_UNUSED) 2130 { 2131 return plt->vma + (i + 1) * PLT_ENTRY_SIZE; 2132 } 2133 2134 #define TARGET_LITTLE_SYM bfd_elf32_vax_vec 2135 #define TARGET_LITTLE_NAME "elf32-vax" 2136 #define ELF_MACHINE_CODE EM_VAX 2137 #define ELF_MAXPAGESIZE 0x10000 2138 2139 #define elf_backend_create_dynamic_sections \ 2140 _bfd_elf_create_dynamic_sections 2141 #define bfd_elf32_bfd_link_hash_table_create \ 2142 elf_vax_link_hash_table_create 2143 #define bfd_elf32_bfd_copy_private_bfd_data \ 2144 elf32_vax_copy_private_bfd_data 2145 2146 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link 2147 2148 #define elf_backend_check_relocs elf_vax_check_relocs 2149 #define elf_backend_adjust_dynamic_symbol \ 2150 elf_vax_adjust_dynamic_symbol 2151 #define elf_backend_size_dynamic_sections \ 2152 elf_vax_size_dynamic_sections 2153 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 2154 #define elf_backend_relocate_section elf_vax_relocate_section 2155 #define elf_backend_finish_dynamic_symbol \ 2156 elf_vax_finish_dynamic_symbol 2157 #define elf_backend_finish_dynamic_sections \ 2158 elf_vax_finish_dynamic_sections 2159 #define elf_backend_reloc_type_class elf_vax_reloc_type_class 2160 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook 2161 #define elf_backend_gc_sweep_hook elf_vax_gc_sweep_hook 2162 #define elf_backend_plt_sym_val elf_vax_plt_sym_val 2163 #define bfd_elf32_bfd_merge_private_bfd_data \ 2164 elf32_vax_merge_private_bfd_data 2165 #define bfd_elf32_bfd_set_private_flags \ 2166 elf32_vax_set_private_flags 2167 #define bfd_elf32_bfd_print_private_bfd_data \ 2168 elf32_vax_print_private_bfd_data 2169 2170 #define elf_backend_can_gc_sections 1 2171 #define elf_backend_want_got_plt 1 2172 #define elf_backend_plt_readonly 1 2173 #define elf_backend_want_plt_sym 0 2174 #define elf_backend_got_header_size 16 2175 #define elf_backend_rela_normal 1 2176 2177 #include "elf32-target.h" 2178