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 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1362 || h->forced_local) 1363 { 1364 h->got.refcount = 0; 1365 h->got.offset = (bfd_vma) -1; 1366 h->plt.refcount = 0; 1367 h->plt.offset = (bfd_vma) -1; 1368 } 1369 else if (h->got.refcount > 0) 1370 { 1371 bfd_boolean dyn; 1372 1373 /* Make sure this symbol is output as a dynamic symbol. */ 1374 if (h->dynindx == -1) 1375 { 1376 if (!bfd_elf_link_record_dynamic_symbol (info, h)) 1377 return FALSE; 1378 } 1379 1380 dyn = elf_hash_table (info)->dynamic_sections_created; 1381 /* Allocate space in the .got and .rela.got sections. */ 1382 if (info->shared || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)) 1383 { 1384 sgot->size += 4; 1385 srelgot->size += sizeof (Elf32_External_Rela); 1386 } 1387 } 1388 1389 return TRUE; 1390 } 1391 1392 /* Relocate an VAX ELF section. */ 1393 1394 static bfd_boolean 1395 elf_vax_relocate_section (bfd *output_bfd, 1396 struct bfd_link_info *info, 1397 bfd *input_bfd, 1398 asection *input_section, 1399 bfd_byte *contents, 1400 Elf_Internal_Rela *relocs, 1401 Elf_Internal_Sym *local_syms, 1402 asection **local_sections) 1403 { 1404 bfd *dynobj; 1405 Elf_Internal_Shdr *symtab_hdr; 1406 struct elf_link_hash_entry **sym_hashes; 1407 bfd_vma plt_index; 1408 bfd_vma got_offset; 1409 asection *sgot; 1410 asection *splt; 1411 asection *sgotplt; 1412 asection *sreloc; 1413 Elf_Internal_Rela *rel; 1414 Elf_Internal_Rela *relend; 1415 1416 dynobj = elf_hash_table (info)->dynobj; 1417 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 1418 sym_hashes = elf_sym_hashes (input_bfd); 1419 1420 sgot = NULL; 1421 splt = NULL; 1422 sgotplt = NULL; 1423 sreloc = NULL; 1424 1425 rel = relocs; 1426 relend = relocs + input_section->reloc_count; 1427 for (; rel < relend; rel++) 1428 { 1429 int r_type; 1430 reloc_howto_type *howto; 1431 unsigned long r_symndx; 1432 struct elf_link_hash_entry *h; 1433 Elf_Internal_Sym *sym; 1434 asection *sec; 1435 bfd_vma relocation; 1436 bfd_reloc_status_type r; 1437 1438 r_type = ELF32_R_TYPE (rel->r_info); 1439 if (r_type < 0 || r_type >= (int) R_VAX_max) 1440 { 1441 bfd_set_error (bfd_error_bad_value); 1442 return FALSE; 1443 } 1444 howto = howto_table + r_type; 1445 1446 r_symndx = ELF32_R_SYM (rel->r_info); 1447 h = NULL; 1448 sym = NULL; 1449 sec = NULL; 1450 if (r_symndx < symtab_hdr->sh_info) 1451 { 1452 sym = local_syms + r_symndx; 1453 sec = local_sections[r_symndx]; 1454 #if 0 /* XXXMRG */ 1455 relocation = (sec->output_section->vma 1456 + sec->output_offset 1457 + sym->st_value); 1458 #else 1459 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 1460 #endif 1461 } 1462 else 1463 { 1464 bfd_boolean unresolved_reloc; 1465 bfd_boolean warned; 1466 1467 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 1468 r_symndx, symtab_hdr, sym_hashes, 1469 h, sec, relocation, 1470 unresolved_reloc, warned); 1471 1472 if ((h->root.type == bfd_link_hash_defined 1473 || h->root.type == bfd_link_hash_defweak) 1474 && ((r_type == R_VAX_PLT32 1475 && h->plt.offset != (bfd_vma) -1 1476 && !h->forced_local 1477 && elf_hash_table (info)->dynamic_sections_created) 1478 || (r_type == R_VAX_GOT32 1479 && h->got.offset != (bfd_vma) -1 1480 && !h->forced_local 1481 && elf_hash_table (info)->dynamic_sections_created 1482 && (! info->shared 1483 || (! info->symbolic && h->dynindx != -1) 1484 || !h->def_regular)) 1485 || (info->shared 1486 && ((! info->symbolic && h->dynindx != -1) 1487 || !h->def_regular) 1488 && ((input_section->flags & SEC_ALLOC) != 0 1489 /* DWARF will emit R_VAX_32 relocations in its 1490 sections against symbols defined externally 1491 in shared libraries. We can't do anything 1492 with them here. */ 1493 1494 || ((input_section->flags & SEC_DEBUGGING) != 0 1495 && h->def_dynamic)) 1496 && (r_type == R_VAX_8 1497 || r_type == R_VAX_16 1498 || r_type == R_VAX_32)))) 1499 /* In these cases, we don't need the relocation 1500 value. We check specially because in some 1501 obscure cases sec->output_section will be NULL. */ 1502 relocation = 0; 1503 } 1504 1505 if (sec != NULL && elf_discarded_section (sec)) 1506 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 1507 rel, relend, howto, contents); 1508 1509 if (info->relocatable) 1510 continue; 1511 1512 switch (r_type) 1513 { 1514 case R_VAX_GOT32: 1515 /* Relocation is to the address of the entry for this symbol 1516 in the global offset table. */ 1517 if (h == NULL 1518 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1519 || h->got.offset == (bfd_vma) -1 1520 || h->forced_local) 1521 break; 1522 1523 /* Relocation is the offset of the entry for this symbol in 1524 the global offset table. */ 1525 1526 { 1527 bfd_boolean dyn; 1528 bfd_vma off; 1529 1530 if (sgot == NULL) 1531 { 1532 sgot = bfd_get_section_by_name (dynobj, ".got"); 1533 BFD_ASSERT (sgot != NULL); 1534 } 1535 1536 BFD_ASSERT (h != NULL); 1537 off = h->got.offset; 1538 BFD_ASSERT (off != (bfd_vma) -1); 1539 BFD_ASSERT (off < sgot->size); 1540 1541 dyn = elf_hash_table (info)->dynamic_sections_created; 1542 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 1543 || (info->shared 1544 && SYMBOL_REFERENCES_LOCAL (info, h))) 1545 { 1546 /* The symbol was forced to be local 1547 because of a version file.. We must initialize 1548 this entry in the global offset table. Since 1549 the offset must always be a multiple of 4, we 1550 use the least significant bit to record whether 1551 we have initialized it already. 1552 1553 When doing a dynamic link, we create a .rela.got 1554 relocation entry to initialize the value. This 1555 is done in the finish_dynamic_symbol routine. */ 1556 if ((off & 1) != 0) 1557 off &= ~1; 1558 else 1559 { 1560 bfd_put_32 (output_bfd, relocation + rel->r_addend, 1561 sgot->contents + off); 1562 h->got.offset |= 1; 1563 } 1564 } else { 1565 bfd_put_32 (output_bfd, rel->r_addend, sgot->contents + off); 1566 } 1567 1568 relocation = sgot->output_offset + off; 1569 /* The GOT relocation uses the addend. */ 1570 rel->r_addend = 0; 1571 1572 /* Change the reference to be indirect. */ 1573 contents[rel->r_offset - 1] |= 0x10; 1574 relocation += sgot->output_section->vma; 1575 } 1576 break; 1577 1578 case R_VAX_PC32: 1579 /* If we are creating an executable and the function this 1580 reloc refers to is in a shared lib, then we made a PLT 1581 entry for this symbol and need to handle the reloc like 1582 a PLT reloc. */ 1583 if (info->shared) 1584 goto r_vax_pc32_shared; 1585 /* Fall through. */ 1586 case R_VAX_PLT32: 1587 /* Relocation is to the entry for this symbol in the 1588 procedure linkage table. */ 1589 1590 /* Resolve a PLTxx reloc against a local symbol directly, 1591 without using the procedure linkage table. */ 1592 if (h == NULL 1593 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1594 || h->forced_local) 1595 break; 1596 1597 if (h->plt.offset == (bfd_vma) -1 1598 || h->forced_local 1599 || !elf_hash_table (info)->dynamic_sections_created) 1600 { 1601 /* We didn't make a PLT entry for this symbol. This 1602 happens when statically linking PIC code, or when 1603 using -Bsymbolic. */ 1604 break; 1605 } 1606 1607 if (splt == NULL) 1608 { 1609 splt = bfd_get_section_by_name (dynobj, ".plt"); 1610 BFD_ASSERT (splt != NULL); 1611 } 1612 1613 if (sgotplt == NULL) 1614 { 1615 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 1616 BFD_ASSERT (sgotplt != NULL); 1617 } 1618 1619 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1620 1621 /* Get the offset into the .got table of the entry that 1622 corresponds to this function. Each .got entry is 4 bytes. 1623 The first two are reserved. */ 1624 got_offset = (plt_index + 3) * 4; 1625 1626 /* We want the relocation to point into the .got.plt instead 1627 of the plt itself. */ 1628 relocation = (sgotplt->output_section->vma 1629 + sgotplt->output_offset 1630 + got_offset); 1631 contents[rel->r_offset-1] |= 0x10; /* make indirect */ 1632 if (rel->r_addend == 2) 1633 { 1634 h->plt.offset |= 1; 1635 } 1636 else if (rel->r_addend != 0) 1637 (*_bfd_error_handler) 1638 (_("%s: warning: PLT addend of %d to `%s' from %s section ignored"), 1639 bfd_get_filename (input_bfd), rel->r_addend, 1640 h->root.root.string, 1641 bfd_get_section_name (input_bfd, input_section)); 1642 rel->r_addend = 0; 1643 1644 break; 1645 1646 case R_VAX_PC8: 1647 case R_VAX_PC16: 1648 r_vax_pc32_shared: 1649 if (h == NULL 1650 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1651 || h->forced_local) 1652 break; 1653 /* Fall through. */ 1654 case R_VAX_8: 1655 case R_VAX_16: 1656 case R_VAX_32: 1657 if (info->shared 1658 && r_symndx != STN_UNDEF 1659 && (input_section->flags & SEC_ALLOC) != 0 1660 && ((r_type != R_VAX_PC8 1661 && r_type != R_VAX_PC16 1662 && r_type != R_VAX_PC32) 1663 || ((input_section->flags & SEC_CODE) != 0 1664 && (!info->symbolic 1665 || (!h->def_regular && h->type != STT_SECTION))))) 1666 { 1667 Elf_Internal_Rela outrel; 1668 bfd_byte *loc; 1669 bfd_boolean skip, relocate; 1670 1671 /* When generating a shared object, these relocations 1672 are copied into the output file to be resolved at run 1673 time. */ 1674 if (sreloc == NULL) 1675 { 1676 sreloc = _bfd_elf_get_dynamic_reloc_section 1677 (input_bfd, input_section, /*rela?*/ TRUE); 1678 if (sreloc == NULL) 1679 return FALSE; 1680 } 1681 1682 skip = FALSE; 1683 relocate = FALSE; 1684 1685 outrel.r_offset = 1686 _bfd_elf_section_offset (output_bfd, info, input_section, 1687 rel->r_offset); 1688 if (outrel.r_offset == (bfd_vma) -1) 1689 skip = TRUE; 1690 if (outrel.r_offset == (bfd_vma) -2) 1691 skip = TRUE, relocate = TRUE; 1692 outrel.r_offset += (input_section->output_section->vma 1693 + input_section->output_offset); 1694 1695 if (skip) 1696 memset (&outrel, 0, sizeof outrel); 1697 /* h->dynindx may be -1 if the symbol was marked to 1698 become local. */ 1699 else if (h != NULL 1700 && ((! info->symbolic && h->dynindx != -1) 1701 || !h->def_regular)) 1702 { 1703 BFD_ASSERT (h->dynindx != -1); 1704 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 1705 outrel.r_addend = relocation + rel->r_addend; 1706 } 1707 else 1708 { 1709 if (r_type == R_VAX_32) 1710 { 1711 relocate = TRUE; 1712 outrel.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE); 1713 outrel.r_addend = bfd_get_signed_32(input_bfd, 1714 &contents[rel->r_offset]) 1715 + relocation + rel->r_addend; 1716 } 1717 else 1718 { 1719 long indx; 1720 1721 if (bfd_is_abs_section (sec)) 1722 indx = 0; 1723 else if (sec == NULL || sec->owner == NULL) 1724 { 1725 bfd_set_error (bfd_error_bad_value); 1726 return FALSE; 1727 } 1728 else 1729 { 1730 asection *osec; 1731 1732 /* We are turning this relocation into one 1733 against a section symbol. It would be 1734 proper to subtract the symbol's value, 1735 osec->vma, from the emitted reloc addend, 1736 but ld.so expects buggy relocs. */ 1737 osec = sec->output_section; 1738 indx = elf_section_data (osec)->dynindx; 1739 if (indx == 0) 1740 { 1741 struct elf_link_hash_table *htab; 1742 htab = elf_hash_table (info); 1743 osec = htab->text_index_section; 1744 indx = elf_section_data (osec)->dynindx; 1745 } 1746 BFD_ASSERT (indx != 0); 1747 } 1748 1749 outrel.r_info = ELF32_R_INFO (indx, r_type); 1750 outrel.r_addend = relocation + rel->r_addend; 1751 } 1752 } 1753 1754 if (strcmp (bfd_get_section_name (input_bfd, input_section), 1755 ".text") == 0 || 1756 (info->shared 1757 && ELF32_R_TYPE(outrel.r_info) != R_VAX_32 1758 && ELF32_R_TYPE(outrel.r_info) != R_VAX_RELATIVE 1759 && ELF32_R_TYPE(outrel.r_info) != R_VAX_COPY 1760 && ELF32_R_TYPE(outrel.r_info) != R_VAX_JMP_SLOT 1761 && ELF32_R_TYPE(outrel.r_info) != R_VAX_GLOB_DAT)) 1762 { 1763 if (h != NULL) 1764 (*_bfd_error_handler) 1765 (_("%s: warning: %s relocation against symbol `%s' from %s section"), 1766 bfd_get_filename (input_bfd), howto->name, 1767 h->root.root.string, 1768 bfd_get_section_name (input_bfd, input_section)); 1769 else 1770 (*_bfd_error_handler) 1771 (_("%s: warning: %s relocation to 0x%x from %s section"), 1772 bfd_get_filename (input_bfd), howto->name, 1773 outrel.r_addend, 1774 bfd_get_section_name (input_bfd, input_section)); 1775 } 1776 loc = sreloc->contents; 1777 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); 1778 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); 1779 1780 /* This reloc will be computed at runtime, so there's no 1781 need to do anything now, except for R_VAX_32 1782 relocations that have been turned into 1783 R_VAX_RELATIVE. */ 1784 if (!relocate) 1785 continue; 1786 } 1787 1788 break; 1789 1790 case R_VAX_GNU_VTINHERIT: 1791 case R_VAX_GNU_VTENTRY: 1792 /* These are no-ops in the end. */ 1793 continue; 1794 1795 default: 1796 break; 1797 } 1798 1799 /* VAX PCREL relocations are from the end of relocation, not the start. 1800 So subtract the difference from the relocation amount since we can't 1801 add it to the offset. */ 1802 if (howto->pc_relative && howto->pcrel_offset) 1803 relocation -= bfd_get_reloc_size(howto); 1804 1805 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 1806 contents, rel->r_offset, 1807 relocation, rel->r_addend); 1808 1809 if (r != bfd_reloc_ok) 1810 { 1811 switch (r) 1812 { 1813 default: 1814 case bfd_reloc_outofrange: 1815 abort (); 1816 case bfd_reloc_overflow: 1817 { 1818 const char *name; 1819 1820 if (h != NULL) 1821 name = NULL; 1822 else 1823 { 1824 name = bfd_elf_string_from_elf_section (input_bfd, 1825 symtab_hdr->sh_link, 1826 sym->st_name); 1827 if (name == NULL) 1828 return FALSE; 1829 if (*name == '\0') 1830 name = bfd_section_name (input_bfd, sec); 1831 } 1832 if (!(info->callbacks->reloc_overflow 1833 (info, (h ? &h->root : NULL), name, howto->name, 1834 (bfd_vma) 0, input_bfd, input_section, 1835 rel->r_offset))) 1836 return FALSE; 1837 } 1838 break; 1839 } 1840 } 1841 } 1842 1843 return TRUE; 1844 } 1845 1846 /* Finish up dynamic symbol handling. We set the contents of various 1847 dynamic sections here. */ 1848 1849 static bfd_boolean 1850 elf_vax_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info, 1851 struct elf_link_hash_entry *h, 1852 Elf_Internal_Sym *sym) 1853 { 1854 bfd *dynobj; 1855 1856 dynobj = elf_hash_table (info)->dynobj; 1857 1858 if (h->plt.offset != (bfd_vma) -1) 1859 { 1860 asection *splt; 1861 asection *sgot; 1862 asection *srela; 1863 bfd_vma plt_index; 1864 bfd_vma got_offset; 1865 bfd_vma addend; 1866 Elf_Internal_Rela rela; 1867 bfd_byte *loc; 1868 1869 /* This symbol has an entry in the procedure linkage table. Set 1870 it up. */ 1871 BFD_ASSERT (h->dynindx != -1); 1872 1873 splt = bfd_get_section_by_name (dynobj, ".plt"); 1874 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 1875 srela = bfd_get_section_by_name (dynobj, ".rela.plt"); 1876 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); 1877 1878 addend = 2 * (h->plt.offset & 1); 1879 h->plt.offset &= ~1; 1880 1881 /* Get the index in the procedure linkage table which 1882 corresponds to this symbol. This is the index of this symbol 1883 in all the symbols for which we are making plt entries. The 1884 first entry in the procedure linkage table is reserved. */ 1885 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 1886 1887 /* Get the offset into the .got table of the entry that 1888 corresponds to this function. Each .got entry is 4 bytes. 1889 The first two are reserved. */ 1890 got_offset = (plt_index + 3) * 4; 1891 1892 /* Fill in the entry in the procedure linkage table. */ 1893 memcpy (splt->contents + h->plt.offset, elf_vax_plt_entry, 1894 PLT_ENTRY_SIZE); 1895 1896 /* The offset is relative to the first extension word. */ 1897 bfd_put_32 (output_bfd, 1898 -(h->plt.offset + 8), 1899 splt->contents + h->plt.offset + 4); 1900 1901 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), 1902 splt->contents + h->plt.offset + 8); 1903 1904 /* Fill in the entry in the global offset table. */ 1905 bfd_put_32 (output_bfd, 1906 (splt->output_section->vma 1907 + splt->output_offset 1908 + h->plt.offset) + addend, 1909 sgot->contents + got_offset); 1910 1911 /* Fill in the entry in the .rela.plt section. */ 1912 rela.r_offset = (sgot->output_section->vma 1913 + sgot->output_offset 1914 + got_offset); 1915 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_JMP_SLOT); 1916 rela.r_addend = addend; 1917 loc = srela->contents + plt_index * sizeof (Elf32_External_Rela); 1918 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1919 1920 if (!h->def_regular) 1921 { 1922 /* Mark the symbol as undefined, rather than as defined in 1923 the .plt section. Leave the value alone. */ 1924 sym->st_shndx = SHN_UNDEF; 1925 } 1926 } 1927 1928 if (h->got.offset != (bfd_vma) -1) 1929 { 1930 asection *sgot; 1931 asection *srela; 1932 Elf_Internal_Rela rela; 1933 bfd_byte *loc; 1934 1935 /* This symbol has an entry in the global offset table. Set it 1936 up. */ 1937 sgot = bfd_get_section_by_name (dynobj, ".got"); 1938 srela = bfd_get_section_by_name (dynobj, ".rela.got"); 1939 BFD_ASSERT (sgot != NULL && srela != NULL); 1940 1941 rela.r_offset = (sgot->output_section->vma 1942 + sgot->output_offset 1943 + (h->got.offset &~ 1)); 1944 1945 /* If the symbol was forced to be local because of a version file 1946 locally we just want to emit a RELATIVE reloc. The entry in 1947 the global offset table will already have been initialized in 1948 the relocate_section function. */ 1949 if (info->shared 1950 && h->dynindx == -1 1951 && h->def_regular) 1952 { 1953 rela.r_info = ELF32_R_INFO (0, R_VAX_RELATIVE); 1954 } 1955 else 1956 { 1957 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_GLOB_DAT); 1958 } 1959 rela.r_addend = bfd_get_signed_32 (output_bfd, 1960 (sgot->contents 1961 + (h->got.offset & ~1))); 1962 1963 loc = srela->contents; 1964 loc += srela->reloc_count++ * sizeof (Elf32_External_Rela); 1965 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1966 } 1967 1968 if (h->needs_copy) 1969 { 1970 asection *s; 1971 Elf_Internal_Rela rela; 1972 bfd_byte *loc; 1973 1974 /* This symbol needs a copy reloc. Set it up. */ 1975 BFD_ASSERT (h->dynindx != -1 1976 && (h->root.type == bfd_link_hash_defined 1977 || h->root.type == bfd_link_hash_defweak)); 1978 1979 s = bfd_get_section_by_name (h->root.u.def.section->owner, 1980 ".rela.bss"); 1981 BFD_ASSERT (s != NULL); 1982 1983 rela.r_offset = (h->root.u.def.value 1984 + h->root.u.def.section->output_section->vma 1985 + h->root.u.def.section->output_offset); 1986 rela.r_info = ELF32_R_INFO (h->dynindx, R_VAX_COPY); 1987 rela.r_addend = 0; 1988 loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rela); 1989 bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); 1990 } 1991 1992 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 1993 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 1994 || h == elf_hash_table (info)->hgot) 1995 sym->st_shndx = SHN_ABS; 1996 1997 return TRUE; 1998 } 1999 2000 /* Finish up the dynamic sections. */ 2001 2002 static bfd_boolean 2003 elf_vax_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 2004 { 2005 bfd *dynobj; 2006 asection *sgot; 2007 asection *sdyn; 2008 2009 dynobj = elf_hash_table (info)->dynobj; 2010 2011 sgot = bfd_get_section_by_name (dynobj, ".got.plt"); 2012 BFD_ASSERT (sgot != NULL); 2013 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 2014 2015 if (elf_hash_table (info)->dynamic_sections_created) 2016 { 2017 asection *splt; 2018 Elf32_External_Dyn *dyncon, *dynconend; 2019 2020 splt = bfd_get_section_by_name (dynobj, ".plt"); 2021 BFD_ASSERT (splt != NULL && sdyn != NULL); 2022 2023 dyncon = (Elf32_External_Dyn *) sdyn->contents; 2024 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 2025 for (; dyncon < dynconend; dyncon++) 2026 { 2027 Elf_Internal_Dyn dyn; 2028 const char *name; 2029 asection *s; 2030 2031 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 2032 2033 switch (dyn.d_tag) 2034 { 2035 default: 2036 break; 2037 2038 case DT_PLTGOT: 2039 name = ".got"; 2040 goto get_vma; 2041 case DT_JMPREL: 2042 name = ".rela.plt"; 2043 get_vma: 2044 s = bfd_get_section_by_name (output_bfd, name); 2045 BFD_ASSERT (s != NULL); 2046 dyn.d_un.d_ptr = s->vma; 2047 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2048 break; 2049 2050 case DT_PLTRELSZ: 2051 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2052 BFD_ASSERT (s != NULL); 2053 dyn.d_un.d_val = s->size; 2054 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2055 break; 2056 2057 case DT_RELASZ: 2058 /* The procedure linkage table relocs (DT_JMPREL) should 2059 not be included in the overall relocs (DT_RELA). 2060 Therefore, we override the DT_RELASZ entry here to 2061 make it not include the JMPREL relocs. Since the 2062 linker script arranges for .rela.plt to follow all 2063 other relocation sections, we don't have to worry 2064 about changing the DT_RELA entry. */ 2065 s = bfd_get_section_by_name (output_bfd, ".rela.plt"); 2066 if (s != NULL) 2067 dyn.d_un.d_val -= s->size; 2068 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 2069 break; 2070 } 2071 } 2072 2073 /* Fill in the first entry in the procedure linkage table. */ 2074 if (splt->size > 0) 2075 { 2076 memcpy (splt->contents, elf_vax_plt0_entry, PLT_ENTRY_SIZE); 2077 bfd_put_32 (output_bfd, 2078 (sgot->output_section->vma 2079 + sgot->output_offset + 4 2080 - (splt->output_section->vma + 6)), 2081 splt->contents + 2); 2082 bfd_put_32 (output_bfd, 2083 (sgot->output_section->vma 2084 + sgot->output_offset + 8 2085 - (splt->output_section->vma + 12)), 2086 splt->contents + 8); 2087 elf_section_data (splt->output_section)->this_hdr.sh_entsize 2088 = PLT_ENTRY_SIZE; 2089 } 2090 } 2091 2092 /* Fill in the first three entries in the global offset table. */ 2093 if (sgot->size > 0) 2094 { 2095 if (sdyn == NULL) 2096 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); 2097 else 2098 bfd_put_32 (output_bfd, 2099 sdyn->output_section->vma + sdyn->output_offset, 2100 sgot->contents); 2101 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); 2102 bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); 2103 } 2104 2105 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; 2106 2107 return TRUE; 2108 } 2109 2110 static enum elf_reloc_type_class 2111 elf_vax_reloc_type_class (const Elf_Internal_Rela *rela) 2112 { 2113 switch ((int) ELF32_R_TYPE (rela->r_info)) 2114 { 2115 case R_VAX_RELATIVE: 2116 return reloc_class_relative; 2117 case R_VAX_JMP_SLOT: 2118 return reloc_class_plt; 2119 case R_VAX_COPY: 2120 return reloc_class_copy; 2121 default: 2122 return reloc_class_normal; 2123 } 2124 } 2125 2126 static bfd_vma 2127 elf_vax_plt_sym_val (bfd_vma i, const asection *plt, 2128 const arelent *rel ATTRIBUTE_UNUSED) 2129 { 2130 return plt->vma + (i + 1) * PLT_ENTRY_SIZE; 2131 } 2132 2133 #define TARGET_LITTLE_SYM bfd_elf32_vax_vec 2134 #define TARGET_LITTLE_NAME "elf32-vax" 2135 #define ELF_MACHINE_CODE EM_VAX 2136 #define ELF_MAXPAGESIZE 0x10000 2137 2138 #define elf_backend_create_dynamic_sections \ 2139 _bfd_elf_create_dynamic_sections 2140 #define bfd_elf32_bfd_link_hash_table_create \ 2141 elf_vax_link_hash_table_create 2142 #define bfd_elf32_bfd_copy_private_bfd_data \ 2143 elf32_vax_copy_private_bfd_data 2144 2145 #define bfd_elf32_bfd_final_link bfd_elf_gc_common_final_link 2146 2147 #define elf_backend_check_relocs elf_vax_check_relocs 2148 #define elf_backend_adjust_dynamic_symbol \ 2149 elf_vax_adjust_dynamic_symbol 2150 #define elf_backend_size_dynamic_sections \ 2151 elf_vax_size_dynamic_sections 2152 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 2153 #define elf_backend_relocate_section elf_vax_relocate_section 2154 #define elf_backend_finish_dynamic_symbol \ 2155 elf_vax_finish_dynamic_symbol 2156 #define elf_backend_finish_dynamic_sections \ 2157 elf_vax_finish_dynamic_sections 2158 #define elf_backend_reloc_type_class elf_vax_reloc_type_class 2159 #define elf_backend_gc_mark_hook elf_vax_gc_mark_hook 2160 #define elf_backend_gc_sweep_hook elf_vax_gc_sweep_hook 2161 #define elf_backend_plt_sym_val elf_vax_plt_sym_val 2162 #define bfd_elf32_bfd_merge_private_bfd_data \ 2163 elf32_vax_merge_private_bfd_data 2164 #define bfd_elf32_bfd_set_private_flags \ 2165 elf32_vax_set_private_flags 2166 #define bfd_elf32_bfd_print_private_bfd_data \ 2167 elf32_vax_print_private_bfd_data 2168 2169 #define elf_backend_can_gc_sections 1 2170 #define elf_backend_want_got_plt 1 2171 #define elf_backend_plt_readonly 1 2172 #define elf_backend_want_plt_sym 0 2173 #define elf_backend_got_header_size 16 2174 #define elf_backend_rela_normal 1 2175 2176 #include "elf32-target.h" 2177