1/* X86-64 specific support for 64-bit ELF 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006 3 Free Software Foundation, Inc. 4 Contributed by Jan Hubicka <jh@suse.cz>. 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 21 22#include "bfd.h" 23#include "sysdep.h" 24#include "bfdlink.h" 25#include "libbfd.h" 26#include "elf-bfd.h" 27 28#include "elf/x86-64.h" 29 30/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ 31#define MINUS_ONE (~ (bfd_vma) 0) 32 33/* The relocation "howto" table. Order of fields: 34 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow, 35 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */ 36static reloc_howto_type x86_64_elf_howto_table[] = 37{ 38 HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont, 39 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000, 40 FALSE), 41 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 42 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE, 43 FALSE), 44 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, 45 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff, 46 TRUE), 47 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed, 48 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff, 49 FALSE), 50 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed, 51 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff, 52 TRUE), 53 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 54 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff, 55 FALSE), 56 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 57 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE, 58 MINUS_ONE, FALSE), 59 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 60 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE, 61 MINUS_ONE, FALSE), 62 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 63 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE, 64 MINUS_ONE, FALSE), 65 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, 66 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff, 67 0xffffffff, TRUE), 68 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, 69 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, 70 FALSE), 71 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed, 72 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff, 73 FALSE), 74 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 75 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE), 76 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield, 77 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE), 78 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 79 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE), 80 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, 81 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE), 82 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 83 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE, 84 MINUS_ONE, FALSE), 85 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 86 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE, 87 MINUS_ONE, FALSE), 88 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 89 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE, 90 MINUS_ONE, FALSE), 91 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed, 92 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff, 93 0xffffffff, TRUE), 94 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed, 95 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff, 96 0xffffffff, TRUE), 97 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, 98 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff, 99 0xffffffff, FALSE), 100 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed, 101 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff, 102 0xffffffff, TRUE), 103 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, 104 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff, 105 0xffffffff, FALSE), 106 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 107 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE, 108 TRUE), 109 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 110 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64", 111 FALSE, MINUS_ONE, MINUS_ONE, FALSE), 112 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, 113 bfd_elf_generic_reloc, "R_X86_64_GOTPC32", 114 FALSE, 0xffffffff, 0xffffffff, TRUE), 115 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, 116 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE, 117 FALSE), 118 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed, 119 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE, 120 MINUS_ONE, TRUE), 121 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed, 122 bfd_elf_generic_reloc, "R_X86_64_GOTPC64", 123 FALSE, MINUS_ONE, MINUS_ONE, TRUE), 124 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, 125 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE, 126 MINUS_ONE, FALSE), 127 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed, 128 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE, 129 MINUS_ONE, FALSE), 130 EMPTY_HOWTO (32), 131 EMPTY_HOWTO (33), 132 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0, 133 complain_overflow_bitfield, bfd_elf_generic_reloc, 134 "R_X86_64_GOTPC32_TLSDESC", 135 FALSE, 0xffffffff, 0xffffffff, TRUE), 136 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0, 137 complain_overflow_dont, bfd_elf_generic_reloc, 138 "R_X86_64_TLSDESC_CALL", 139 FALSE, 0, 0, FALSE), 140 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0, 141 complain_overflow_bitfield, bfd_elf_generic_reloc, 142 "R_X86_64_TLSDESC", 143 FALSE, MINUS_ONE, MINUS_ONE, FALSE), 144 145 /* We have a gap in the reloc numbers here. 146 R_X86_64_standard counts the number up to this point, and 147 R_X86_64_vt_offset is the value to subtract from a reloc type of 148 R_X86_64_GNU_VT* to form an index into this table. */ 149#define R_X86_64_standard (R_X86_64_TLSDESC + 1) 150#define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard) 151 152/* GNU extension to record C++ vtable hierarchy. */ 153 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont, 154 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE), 155 156/* GNU extension to record C++ vtable member usage. */ 157 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont, 158 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0, 159 FALSE) 160}; 161 162/* Map BFD relocs to the x86_64 elf relocs. */ 163struct elf_reloc_map 164{ 165 bfd_reloc_code_real_type bfd_reloc_val; 166 unsigned char elf_reloc_val; 167}; 168 169static const struct elf_reloc_map x86_64_reloc_map[] = 170{ 171 { BFD_RELOC_NONE, R_X86_64_NONE, }, 172 { BFD_RELOC_64, R_X86_64_64, }, 173 { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, 174 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, 175 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, 176 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, 177 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, 178 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, 179 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, 180 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, 181 { BFD_RELOC_32, R_X86_64_32, }, 182 { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, 183 { BFD_RELOC_16, R_X86_64_16, }, 184 { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, 185 { BFD_RELOC_8, R_X86_64_8, }, 186 { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, 187 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, 188 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, 189 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, 190 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, 191 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, 192 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, 193 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, 194 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, 195 { BFD_RELOC_64_PCREL, R_X86_64_PC64, }, 196 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, }, 197 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, }, 198 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, }, 199 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, }, 200 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, }, 201 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, }, 202 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, }, 203 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, }, 204 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, }, 205 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, }, 206 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, 207 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, 208}; 209 210static reloc_howto_type * 211elf64_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type) 212{ 213 unsigned i; 214 215 if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT 216 || r_type >= (unsigned int) R_X86_64_max) 217 { 218 if (r_type >= (unsigned int) R_X86_64_standard) 219 { 220 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 221 abfd, (int) r_type); 222 r_type = R_X86_64_NONE; 223 } 224 i = r_type; 225 } 226 else 227 i = r_type - (unsigned int) R_X86_64_vt_offset; 228 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type); 229 return &x86_64_elf_howto_table[i]; 230} 231 232/* Given a BFD reloc type, return a HOWTO structure. */ 233static reloc_howto_type * 234elf64_x86_64_reloc_type_lookup (bfd *abfd, 235 bfd_reloc_code_real_type code) 236{ 237 unsigned int i; 238 239 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); 240 i++) 241 { 242 if (x86_64_reloc_map[i].bfd_reloc_val == code) 243 return elf64_x86_64_rtype_to_howto (abfd, 244 x86_64_reloc_map[i].elf_reloc_val); 245 } 246 return 0; 247} 248 249/* Given an x86_64 ELF reloc type, fill in an arelent structure. */ 250 251static void 252elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, 253 Elf_Internal_Rela *dst) 254{ 255 unsigned r_type; 256 257 r_type = ELF64_R_TYPE (dst->r_info); 258 cache_ptr->howto = elf64_x86_64_rtype_to_howto (abfd, r_type); 259 BFD_ASSERT (r_type == cache_ptr->howto->type); 260} 261 262/* Support for core dump NOTE sections. */ 263static bfd_boolean 264elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 265{ 266 int offset; 267 size_t size; 268 269 switch (note->descsz) 270 { 271 default: 272 return FALSE; 273 274 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ 275 /* pr_cursig */ 276 elf_tdata (abfd)->core_signal 277 = bfd_get_16 (abfd, note->descdata + 12); 278 279 /* pr_pid */ 280 elf_tdata (abfd)->core_pid 281 = bfd_get_32 (abfd, note->descdata + 32); 282 283 /* pr_reg */ 284 offset = 112; 285 size = 216; 286 287 break; 288 } 289 290 /* Make a ".reg/999" section. */ 291 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 292 size, note->descpos + offset); 293} 294 295static bfd_boolean 296elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 297{ 298 switch (note->descsz) 299 { 300 default: 301 return FALSE; 302 303 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ 304 elf_tdata (abfd)->core_program 305 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); 306 elf_tdata (abfd)->core_command 307 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); 308 } 309 310 /* Note that for some reason, a spurious space is tacked 311 onto the end of the args in some (at least one anyway) 312 implementations, so strip it off if it exists. */ 313 314 { 315 char *command = elf_tdata (abfd)->core_command; 316 int n = strlen (command); 317 318 if (0 < n && command[n - 1] == ' ') 319 command[n - 1] = '\0'; 320 } 321 322 return TRUE; 323} 324 325/* Functions for the x86-64 ELF linker. */ 326 327/* The name of the dynamic interpreter. This is put in the .interp 328 section. */ 329 330#define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1" 331 332/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 333 copying dynamic variables from a shared lib into an app's dynbss 334 section, and instead use a dynamic relocation to point into the 335 shared lib. */ 336#define ELIMINATE_COPY_RELOCS 1 337 338/* The size in bytes of an entry in the global offset table. */ 339 340#define GOT_ENTRY_SIZE 8 341 342/* The size in bytes of an entry in the procedure linkage table. */ 343 344#define PLT_ENTRY_SIZE 16 345 346/* The first entry in a procedure linkage table looks like this. See the 347 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */ 348 349static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] = 350{ 351 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ 352 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ 353 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ 354}; 355 356/* Subsequent entries in a procedure linkage table look like this. */ 357 358static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] = 359{ 360 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ 361 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ 362 0x68, /* pushq immediate */ 363 0, 0, 0, 0, /* replaced with index into relocation table. */ 364 0xe9, /* jmp relative */ 365 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ 366}; 367 368/* The x86-64 linker needs to keep track of the number of relocs that 369 it decides to copy as dynamic relocs in check_relocs for each symbol. 370 This is so that it can later discard them if they are found to be 371 unnecessary. We store the information in a field extending the 372 regular ELF linker hash table. */ 373 374struct elf64_x86_64_dyn_relocs 375{ 376 /* Next section. */ 377 struct elf64_x86_64_dyn_relocs *next; 378 379 /* The input section of the reloc. */ 380 asection *sec; 381 382 /* Total number of relocs copied for the input section. */ 383 bfd_size_type count; 384 385 /* Number of pc-relative relocs copied for the input section. */ 386 bfd_size_type pc_count; 387}; 388 389/* x86-64 ELF linker hash entry. */ 390 391struct elf64_x86_64_link_hash_entry 392{ 393 struct elf_link_hash_entry elf; 394 395 /* Track dynamic relocs copied for this symbol. */ 396 struct elf64_x86_64_dyn_relocs *dyn_relocs; 397 398#define GOT_UNKNOWN 0 399#define GOT_NORMAL 1 400#define GOT_TLS_GD 2 401#define GOT_TLS_IE 3 402#define GOT_TLS_GDESC 4 403#define GOT_TLS_GD_BOTH_P(type) \ 404 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) 405#define GOT_TLS_GD_P(type) \ 406 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) 407#define GOT_TLS_GDESC_P(type) \ 408 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) 409#define GOT_TLS_GD_ANY_P(type) \ 410 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) 411 unsigned char tls_type; 412 413 /* Offset of the GOTPLT entry reserved for the TLS descriptor, 414 starting at the end of the jump table. */ 415 bfd_vma tlsdesc_got; 416}; 417 418#define elf64_x86_64_hash_entry(ent) \ 419 ((struct elf64_x86_64_link_hash_entry *)(ent)) 420 421struct elf64_x86_64_obj_tdata 422{ 423 struct elf_obj_tdata root; 424 425 /* tls_type for each local got entry. */ 426 char *local_got_tls_type; 427 428 /* GOTPLT entries for TLS descriptors. */ 429 bfd_vma *local_tlsdesc_gotent; 430}; 431 432#define elf64_x86_64_tdata(abfd) \ 433 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any) 434 435#define elf64_x86_64_local_got_tls_type(abfd) \ 436 (elf64_x86_64_tdata (abfd)->local_got_tls_type) 437 438#define elf64_x86_64_local_tlsdesc_gotent(abfd) \ 439 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent) 440 441/* x86-64 ELF linker hash table. */ 442 443struct elf64_x86_64_link_hash_table 444{ 445 struct elf_link_hash_table elf; 446 447 /* Short-cuts to get to dynamic linker sections. */ 448 asection *sgot; 449 asection *sgotplt; 450 asection *srelgot; 451 asection *splt; 452 asection *srelplt; 453 asection *sdynbss; 454 asection *srelbss; 455 456 /* The offset into splt of the PLT entry for the TLS descriptor 457 resolver. Special values are 0, if not necessary (or not found 458 to be necessary yet), and -1 if needed but not determined 459 yet. */ 460 bfd_vma tlsdesc_plt; 461 /* The offset into sgot of the GOT entry used by the PLT entry 462 above. */ 463 bfd_vma tlsdesc_got; 464 465 union { 466 bfd_signed_vma refcount; 467 bfd_vma offset; 468 } tls_ld_got; 469 470 /* The amount of space used by the jump slots in the GOT. */ 471 bfd_vma sgotplt_jump_table_size; 472 473 /* Small local sym to section mapping cache. */ 474 struct sym_sec_cache sym_sec; 475}; 476 477/* Get the x86-64 ELF linker hash table from a link_info structure. */ 478 479#define elf64_x86_64_hash_table(p) \ 480 ((struct elf64_x86_64_link_hash_table *) ((p)->hash)) 481 482#define elf64_x86_64_compute_jump_table_size(htab) \ 483 ((htab)->srelplt->reloc_count * GOT_ENTRY_SIZE) 484 485/* Create an entry in an x86-64 ELF linker hash table. */ 486 487static struct bfd_hash_entry * 488link_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table, 489 const char *string) 490{ 491 /* Allocate the structure if it has not already been allocated by a 492 subclass. */ 493 if (entry == NULL) 494 { 495 entry = bfd_hash_allocate (table, 496 sizeof (struct elf64_x86_64_link_hash_entry)); 497 if (entry == NULL) 498 return entry; 499 } 500 501 /* Call the allocation method of the superclass. */ 502 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 503 if (entry != NULL) 504 { 505 struct elf64_x86_64_link_hash_entry *eh; 506 507 eh = (struct elf64_x86_64_link_hash_entry *) entry; 508 eh->dyn_relocs = NULL; 509 eh->tls_type = GOT_UNKNOWN; 510 eh->tlsdesc_got = (bfd_vma) -1; 511 } 512 513 return entry; 514} 515 516/* Create an X86-64 ELF linker hash table. */ 517 518static struct bfd_link_hash_table * 519elf64_x86_64_link_hash_table_create (bfd *abfd) 520{ 521 struct elf64_x86_64_link_hash_table *ret; 522 bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table); 523 524 ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt); 525 if (ret == NULL) 526 return NULL; 527 528 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 529 sizeof (struct elf64_x86_64_link_hash_entry))) 530 { 531 free (ret); 532 return NULL; 533 } 534 535 ret->sgot = NULL; 536 ret->sgotplt = NULL; 537 ret->srelgot = NULL; 538 ret->splt = NULL; 539 ret->srelplt = NULL; 540 ret->sdynbss = NULL; 541 ret->srelbss = NULL; 542 ret->sym_sec.abfd = NULL; 543 ret->tlsdesc_plt = 0; 544 ret->tlsdesc_got = 0; 545 ret->tls_ld_got.refcount = 0; 546 ret->sgotplt_jump_table_size = 0; 547 548 return &ret->elf.root; 549} 550 551/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up 552 shortcuts to them in our hash table. */ 553 554static bfd_boolean 555create_got_section (bfd *dynobj, struct bfd_link_info *info) 556{ 557 struct elf64_x86_64_link_hash_table *htab; 558 559 if (! _bfd_elf_create_got_section (dynobj, info)) 560 return FALSE; 561 562 htab = elf64_x86_64_hash_table (info); 563 htab->sgot = bfd_get_section_by_name (dynobj, ".got"); 564 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 565 if (!htab->sgot || !htab->sgotplt) 566 abort (); 567 568 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", 569 (SEC_ALLOC | SEC_LOAD 570 | SEC_HAS_CONTENTS 571 | SEC_IN_MEMORY 572 | SEC_LINKER_CREATED 573 | SEC_READONLY)); 574 if (htab->srelgot == NULL 575 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3)) 576 return FALSE; 577 return TRUE; 578} 579 580/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and 581 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our 582 hash table. */ 583 584static bfd_boolean 585elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 586{ 587 struct elf64_x86_64_link_hash_table *htab; 588 589 htab = elf64_x86_64_hash_table (info); 590 if (!htab->sgot && !create_got_section (dynobj, info)) 591 return FALSE; 592 593 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 594 return FALSE; 595 596 htab->splt = bfd_get_section_by_name (dynobj, ".plt"); 597 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); 598 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 599 if (!info->shared) 600 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); 601 602 if (!htab->splt || !htab->srelplt || !htab->sdynbss 603 || (!info->shared && !htab->srelbss)) 604 abort (); 605 606 return TRUE; 607} 608 609/* Copy the extra info we tack onto an elf_link_hash_entry. */ 610 611static void 612elf64_x86_64_copy_indirect_symbol (struct bfd_link_info *info, 613 struct elf_link_hash_entry *dir, 614 struct elf_link_hash_entry *ind) 615{ 616 struct elf64_x86_64_link_hash_entry *edir, *eind; 617 618 edir = (struct elf64_x86_64_link_hash_entry *) dir; 619 eind = (struct elf64_x86_64_link_hash_entry *) ind; 620 621 if (eind->dyn_relocs != NULL) 622 { 623 if (edir->dyn_relocs != NULL) 624 { 625 struct elf64_x86_64_dyn_relocs **pp; 626 struct elf64_x86_64_dyn_relocs *p; 627 628 /* Add reloc counts against the indirect sym to the direct sym 629 list. Merge any entries against the same section. */ 630 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 631 { 632 struct elf64_x86_64_dyn_relocs *q; 633 634 for (q = edir->dyn_relocs; q != NULL; q = q->next) 635 if (q->sec == p->sec) 636 { 637 q->pc_count += p->pc_count; 638 q->count += p->count; 639 *pp = p->next; 640 break; 641 } 642 if (q == NULL) 643 pp = &p->next; 644 } 645 *pp = edir->dyn_relocs; 646 } 647 648 edir->dyn_relocs = eind->dyn_relocs; 649 eind->dyn_relocs = NULL; 650 } 651 652 if (ind->root.type == bfd_link_hash_indirect 653 && dir->got.refcount <= 0) 654 { 655 edir->tls_type = eind->tls_type; 656 eind->tls_type = GOT_UNKNOWN; 657 } 658 659 if (ELIMINATE_COPY_RELOCS 660 && ind->root.type != bfd_link_hash_indirect 661 && dir->dynamic_adjusted) 662 { 663 /* If called to transfer flags for a weakdef during processing 664 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 665 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 666 dir->ref_dynamic |= ind->ref_dynamic; 667 dir->ref_regular |= ind->ref_regular; 668 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 669 dir->needs_plt |= ind->needs_plt; 670 dir->pointer_equality_needed |= ind->pointer_equality_needed; 671 } 672 else 673 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 674} 675 676static bfd_boolean 677elf64_x86_64_mkobject (bfd *abfd) 678{ 679 if (abfd->tdata.any == NULL) 680 { 681 bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata); 682 abfd->tdata.any = bfd_zalloc (abfd, amt); 683 if (abfd->tdata.any == NULL) 684 return FALSE; 685 } 686 return bfd_elf_mkobject (abfd); 687} 688 689static bfd_boolean 690elf64_x86_64_elf_object_p (bfd *abfd) 691{ 692 /* Set the right machine number for an x86-64 elf64 file. */ 693 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); 694 return TRUE; 695} 696 697static int 698elf64_x86_64_tls_transition (struct bfd_link_info *info, int r_type, int is_local) 699{ 700 if (info->shared) 701 return r_type; 702 703 switch (r_type) 704 { 705 case R_X86_64_TLSGD: 706 case R_X86_64_GOTPC32_TLSDESC: 707 case R_X86_64_TLSDESC_CALL: 708 case R_X86_64_GOTTPOFF: 709 if (is_local) 710 return R_X86_64_TPOFF32; 711 return R_X86_64_GOTTPOFF; 712 case R_X86_64_TLSLD: 713 return R_X86_64_TPOFF32; 714 } 715 716 return r_type; 717} 718 719/* Look through the relocs for a section during the first phase, and 720 calculate needed space in the global offset table, procedure 721 linkage table, and dynamic reloc sections. */ 722 723static bfd_boolean 724elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, 725 const Elf_Internal_Rela *relocs) 726{ 727 struct elf64_x86_64_link_hash_table *htab; 728 Elf_Internal_Shdr *symtab_hdr; 729 struct elf_link_hash_entry **sym_hashes; 730 const Elf_Internal_Rela *rel; 731 const Elf_Internal_Rela *rel_end; 732 asection *sreloc; 733 734 if (info->relocatable) 735 return TRUE; 736 737 htab = elf64_x86_64_hash_table (info); 738 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 739 sym_hashes = elf_sym_hashes (abfd); 740 741 sreloc = NULL; 742 743 rel_end = relocs + sec->reloc_count; 744 for (rel = relocs; rel < rel_end; rel++) 745 { 746 unsigned int r_type; 747 unsigned long r_symndx; 748 struct elf_link_hash_entry *h; 749 750 r_symndx = ELF64_R_SYM (rel->r_info); 751 r_type = ELF64_R_TYPE (rel->r_info); 752 753 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 754 { 755 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), 756 abfd, r_symndx); 757 return FALSE; 758 } 759 760 if (r_symndx < symtab_hdr->sh_info) 761 h = NULL; 762 else 763 { 764 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 765 while (h->root.type == bfd_link_hash_indirect 766 || h->root.type == bfd_link_hash_warning) 767 h = (struct elf_link_hash_entry *) h->root.u.i.link; 768 } 769 770 r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL); 771 switch (r_type) 772 { 773 case R_X86_64_TLSLD: 774 htab->tls_ld_got.refcount += 1; 775 goto create_got; 776 777 case R_X86_64_TPOFF32: 778 if (info->shared) 779 { 780 (*_bfd_error_handler) 781 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), 782 abfd, 783 x86_64_elf_howto_table[r_type].name, 784 (h) ? h->root.root.string : "a local symbol"); 785 bfd_set_error (bfd_error_bad_value); 786 return FALSE; 787 } 788 break; 789 790 case R_X86_64_GOTTPOFF: 791 if (info->shared) 792 info->flags |= DF_STATIC_TLS; 793 /* Fall through */ 794 795 case R_X86_64_GOT32: 796 case R_X86_64_GOTPCREL: 797 case R_X86_64_TLSGD: 798 case R_X86_64_GOT64: 799 case R_X86_64_GOTPCREL64: 800 case R_X86_64_GOTPLT64: 801 case R_X86_64_GOTPC32_TLSDESC: 802 case R_X86_64_TLSDESC_CALL: 803 /* This symbol requires a global offset table entry. */ 804 { 805 int tls_type, old_tls_type; 806 807 switch (r_type) 808 { 809 default: tls_type = GOT_NORMAL; break; 810 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break; 811 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break; 812 case R_X86_64_GOTPC32_TLSDESC: 813 case R_X86_64_TLSDESC_CALL: 814 tls_type = GOT_TLS_GDESC; break; 815 } 816 817 if (h != NULL) 818 { 819 if (r_type == R_X86_64_GOTPLT64) 820 { 821 /* This relocation indicates that we also need 822 a PLT entry, as this is a function. We don't need 823 a PLT entry for local symbols. */ 824 h->needs_plt = 1; 825 h->plt.refcount += 1; 826 } 827 h->got.refcount += 1; 828 old_tls_type = elf64_x86_64_hash_entry (h)->tls_type; 829 } 830 else 831 { 832 bfd_signed_vma *local_got_refcounts; 833 834 /* This is a global offset table entry for a local symbol. */ 835 local_got_refcounts = elf_local_got_refcounts (abfd); 836 if (local_got_refcounts == NULL) 837 { 838 bfd_size_type size; 839 840 size = symtab_hdr->sh_info; 841 size *= sizeof (bfd_signed_vma) 842 + sizeof (bfd_vma) + sizeof (char); 843 local_got_refcounts = ((bfd_signed_vma *) 844 bfd_zalloc (abfd, size)); 845 if (local_got_refcounts == NULL) 846 return FALSE; 847 elf_local_got_refcounts (abfd) = local_got_refcounts; 848 elf64_x86_64_local_tlsdesc_gotent (abfd) 849 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); 850 elf64_x86_64_local_got_tls_type (abfd) 851 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); 852 } 853 local_got_refcounts[r_symndx] += 1; 854 old_tls_type 855 = elf64_x86_64_local_got_tls_type (abfd) [r_symndx]; 856 } 857 858 /* If a TLS symbol is accessed using IE at least once, 859 there is no point to use dynamic model for it. */ 860 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN 861 && (! GOT_TLS_GD_ANY_P (old_tls_type) 862 || tls_type != GOT_TLS_IE)) 863 { 864 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type)) 865 tls_type = old_tls_type; 866 else if (GOT_TLS_GD_ANY_P (old_tls_type) 867 && GOT_TLS_GD_ANY_P (tls_type)) 868 tls_type |= old_tls_type; 869 else 870 { 871 (*_bfd_error_handler) 872 (_("%B: %s' accessed both as normal and thread local symbol"), 873 abfd, h ? h->root.root.string : "<local>"); 874 return FALSE; 875 } 876 } 877 878 if (old_tls_type != tls_type) 879 { 880 if (h != NULL) 881 elf64_x86_64_hash_entry (h)->tls_type = tls_type; 882 else 883 elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type; 884 } 885 } 886 /* Fall through */ 887 888 case R_X86_64_GOTOFF64: 889 case R_X86_64_GOTPC32: 890 case R_X86_64_GOTPC64: 891 create_got: 892 if (htab->sgot == NULL) 893 { 894 if (htab->elf.dynobj == NULL) 895 htab->elf.dynobj = abfd; 896 if (!create_got_section (htab->elf.dynobj, info)) 897 return FALSE; 898 } 899 break; 900 901 case R_X86_64_PLT32: 902 /* This symbol requires a procedure linkage table entry. We 903 actually build the entry in adjust_dynamic_symbol, 904 because this might be a case of linking PIC code which is 905 never referenced by a dynamic object, in which case we 906 don't need to generate a procedure linkage table entry 907 after all. */ 908 909 /* If this is a local symbol, we resolve it directly without 910 creating a procedure linkage table entry. */ 911 if (h == NULL) 912 continue; 913 914 h->needs_plt = 1; 915 h->plt.refcount += 1; 916 break; 917 918 case R_X86_64_PLTOFF64: 919 /* This tries to form the 'address' of a function relative 920 to GOT. For global symbols we need a PLT entry. */ 921 if (h != NULL) 922 { 923 h->needs_plt = 1; 924 h->plt.refcount += 1; 925 } 926 goto create_got; 927 928 case R_X86_64_8: 929 case R_X86_64_16: 930 case R_X86_64_32: 931 case R_X86_64_32S: 932 /* Let's help debug shared library creation. These relocs 933 cannot be used in shared libs. Don't error out for 934 sections we don't care about, such as debug sections or 935 non-constant sections. */ 936 if (info->shared 937 && (sec->flags & SEC_ALLOC) != 0 938 && (sec->flags & SEC_READONLY) != 0) 939 { 940 (*_bfd_error_handler) 941 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), 942 abfd, 943 x86_64_elf_howto_table[r_type].name, 944 (h) ? h->root.root.string : "a local symbol"); 945 bfd_set_error (bfd_error_bad_value); 946 return FALSE; 947 } 948 /* Fall through. */ 949 950 case R_X86_64_PC8: 951 case R_X86_64_PC16: 952 case R_X86_64_PC32: 953 case R_X86_64_PC64: 954 case R_X86_64_64: 955 if (h != NULL && !info->shared) 956 { 957 /* If this reloc is in a read-only section, we might 958 need a copy reloc. We can't check reliably at this 959 stage whether the section is read-only, as input 960 sections have not yet been mapped to output sections. 961 Tentatively set the flag for now, and correct in 962 adjust_dynamic_symbol. */ 963 h->non_got_ref = 1; 964 965 /* We may need a .plt entry if the function this reloc 966 refers to is in a shared lib. */ 967 h->plt.refcount += 1; 968 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64) 969 h->pointer_equality_needed = 1; 970 } 971 972 /* If we are creating a shared library, and this is a reloc 973 against a global symbol, or a non PC relative reloc 974 against a local symbol, then we need to copy the reloc 975 into the shared library. However, if we are linking with 976 -Bsymbolic, we do not need to copy a reloc against a 977 global symbol which is defined in an object we are 978 including in the link (i.e., DEF_REGULAR is set). At 979 this point we have not seen all the input files, so it is 980 possible that DEF_REGULAR is not set now but will be set 981 later (it is never cleared). In case of a weak definition, 982 DEF_REGULAR may be cleared later by a strong definition in 983 a shared library. We account for that possibility below by 984 storing information in the relocs_copied field of the hash 985 table entry. A similar situation occurs when creating 986 shared libraries and symbol visibility changes render the 987 symbol local. 988 989 If on the other hand, we are creating an executable, we 990 may need to keep relocations for symbols satisfied by a 991 dynamic library if we manage to avoid copy relocs for the 992 symbol. */ 993 if ((info->shared 994 && (sec->flags & SEC_ALLOC) != 0 995 && (((r_type != R_X86_64_PC8) 996 && (r_type != R_X86_64_PC16) 997 && (r_type != R_X86_64_PC32) 998 && (r_type != R_X86_64_PC64)) 999 || (h != NULL 1000 && (! SYMBOLIC_BIND (info, h) 1001 || h->root.type == bfd_link_hash_defweak 1002 || !h->def_regular)))) 1003 || (ELIMINATE_COPY_RELOCS 1004 && !info->shared 1005 && (sec->flags & SEC_ALLOC) != 0 1006 && h != NULL 1007 && (h->root.type == bfd_link_hash_defweak 1008 || !h->def_regular))) 1009 { 1010 struct elf64_x86_64_dyn_relocs *p; 1011 struct elf64_x86_64_dyn_relocs **head; 1012 1013 /* We must copy these reloc types into the output file. 1014 Create a reloc section in dynobj and make room for 1015 this reloc. */ 1016 if (sreloc == NULL) 1017 { 1018 const char *name; 1019 bfd *dynobj; 1020 1021 name = (bfd_elf_string_from_elf_section 1022 (abfd, 1023 elf_elfheader (abfd)->e_shstrndx, 1024 elf_section_data (sec)->rel_hdr.sh_name)); 1025 if (name == NULL) 1026 return FALSE; 1027 1028 if (! CONST_STRNEQ (name, ".rela") 1029 || strcmp (bfd_get_section_name (abfd, sec), 1030 name + 5) != 0) 1031 { 1032 (*_bfd_error_handler) 1033 (_("%B: bad relocation section name `%s\'"), 1034 abfd, name); 1035 } 1036 1037 if (htab->elf.dynobj == NULL) 1038 htab->elf.dynobj = abfd; 1039 1040 dynobj = htab->elf.dynobj; 1041 1042 sreloc = bfd_get_section_by_name (dynobj, name); 1043 if (sreloc == NULL) 1044 { 1045 flagword flags; 1046 1047 flags = (SEC_HAS_CONTENTS | SEC_READONLY 1048 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 1049 if ((sec->flags & SEC_ALLOC) != 0) 1050 flags |= SEC_ALLOC | SEC_LOAD; 1051 sreloc = bfd_make_section_with_flags (dynobj, 1052 name, 1053 flags); 1054 if (sreloc == NULL 1055 || ! bfd_set_section_alignment (dynobj, sreloc, 3)) 1056 return FALSE; 1057 } 1058 elf_section_data (sec)->sreloc = sreloc; 1059 } 1060 1061 /* If this is a global symbol, we count the number of 1062 relocations we need for this symbol. */ 1063 if (h != NULL) 1064 { 1065 head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs; 1066 } 1067 else 1068 { 1069 void **vpp; 1070 /* Track dynamic relocs needed for local syms too. 1071 We really need local syms available to do this 1072 easily. Oh well. */ 1073 1074 asection *s; 1075 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 1076 sec, r_symndx); 1077 if (s == NULL) 1078 return FALSE; 1079 1080 /* Beware of type punned pointers vs strict aliasing 1081 rules. */ 1082 vpp = &(elf_section_data (s)->local_dynrel); 1083 head = (struct elf64_x86_64_dyn_relocs **)vpp; 1084 } 1085 1086 p = *head; 1087 if (p == NULL || p->sec != sec) 1088 { 1089 bfd_size_type amt = sizeof *p; 1090 p = ((struct elf64_x86_64_dyn_relocs *) 1091 bfd_alloc (htab->elf.dynobj, amt)); 1092 if (p == NULL) 1093 return FALSE; 1094 p->next = *head; 1095 *head = p; 1096 p->sec = sec; 1097 p->count = 0; 1098 p->pc_count = 0; 1099 } 1100 1101 p->count += 1; 1102 if (r_type == R_X86_64_PC8 1103 || r_type == R_X86_64_PC16 1104 || r_type == R_X86_64_PC32 1105 || r_type == R_X86_64_PC64) 1106 p->pc_count += 1; 1107 } 1108 break; 1109 1110 /* This relocation describes the C++ object vtable hierarchy. 1111 Reconstruct it for later use during GC. */ 1112 case R_X86_64_GNU_VTINHERIT: 1113 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1114 return FALSE; 1115 break; 1116 1117 /* This relocation describes which C++ vtable entries are actually 1118 used. Record for later use during GC. */ 1119 case R_X86_64_GNU_VTENTRY: 1120 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 1121 return FALSE; 1122 break; 1123 1124 default: 1125 break; 1126 } 1127 } 1128 1129 return TRUE; 1130} 1131 1132/* Return the section that should be marked against GC for a given 1133 relocation. */ 1134 1135static asection * 1136elf64_x86_64_gc_mark_hook (asection *sec, 1137 struct bfd_link_info *info, 1138 Elf_Internal_Rela *rel, 1139 struct elf_link_hash_entry *h, 1140 Elf_Internal_Sym *sym) 1141{ 1142 if (h != NULL) 1143 switch (ELF64_R_TYPE (rel->r_info)) 1144 { 1145 case R_X86_64_GNU_VTINHERIT: 1146 case R_X86_64_GNU_VTENTRY: 1147 return NULL; 1148 } 1149 1150 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1151} 1152 1153/* Update the got entry reference counts for the section being removed. */ 1154 1155static bfd_boolean 1156elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, 1157 asection *sec, const Elf_Internal_Rela *relocs) 1158{ 1159 Elf_Internal_Shdr *symtab_hdr; 1160 struct elf_link_hash_entry **sym_hashes; 1161 bfd_signed_vma *local_got_refcounts; 1162 const Elf_Internal_Rela *rel, *relend; 1163 1164 elf_section_data (sec)->local_dynrel = NULL; 1165 1166 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1167 sym_hashes = elf_sym_hashes (abfd); 1168 local_got_refcounts = elf_local_got_refcounts (abfd); 1169 1170 relend = relocs + sec->reloc_count; 1171 for (rel = relocs; rel < relend; rel++) 1172 { 1173 unsigned long r_symndx; 1174 unsigned int r_type; 1175 struct elf_link_hash_entry *h = NULL; 1176 1177 r_symndx = ELF64_R_SYM (rel->r_info); 1178 if (r_symndx >= symtab_hdr->sh_info) 1179 { 1180 struct elf64_x86_64_link_hash_entry *eh; 1181 struct elf64_x86_64_dyn_relocs **pp; 1182 struct elf64_x86_64_dyn_relocs *p; 1183 1184 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1185 while (h->root.type == bfd_link_hash_indirect 1186 || h->root.type == bfd_link_hash_warning) 1187 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1188 eh = (struct elf64_x86_64_link_hash_entry *) h; 1189 1190 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1191 if (p->sec == sec) 1192 { 1193 /* Everything must go for SEC. */ 1194 *pp = p->next; 1195 break; 1196 } 1197 } 1198 1199 r_type = ELF64_R_TYPE (rel->r_info); 1200 r_type = elf64_x86_64_tls_transition (info, r_type, h != NULL); 1201 switch (r_type) 1202 { 1203 case R_X86_64_TLSLD: 1204 if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0) 1205 elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1; 1206 break; 1207 1208 case R_X86_64_TLSGD: 1209 case R_X86_64_GOTPC32_TLSDESC: 1210 case R_X86_64_TLSDESC_CALL: 1211 case R_X86_64_GOTTPOFF: 1212 case R_X86_64_GOT32: 1213 case R_X86_64_GOTPCREL: 1214 case R_X86_64_GOT64: 1215 case R_X86_64_GOTPCREL64: 1216 case R_X86_64_GOTPLT64: 1217 if (h != NULL) 1218 { 1219 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0) 1220 h->plt.refcount -= 1; 1221 if (h->got.refcount > 0) 1222 h->got.refcount -= 1; 1223 } 1224 else if (local_got_refcounts != NULL) 1225 { 1226 if (local_got_refcounts[r_symndx] > 0) 1227 local_got_refcounts[r_symndx] -= 1; 1228 } 1229 break; 1230 1231 case R_X86_64_8: 1232 case R_X86_64_16: 1233 case R_X86_64_32: 1234 case R_X86_64_64: 1235 case R_X86_64_32S: 1236 case R_X86_64_PC8: 1237 case R_X86_64_PC16: 1238 case R_X86_64_PC32: 1239 case R_X86_64_PC64: 1240 if (info->shared) 1241 break; 1242 /* Fall thru */ 1243 1244 case R_X86_64_PLT32: 1245 case R_X86_64_PLTOFF64: 1246 if (h != NULL) 1247 { 1248 if (h->plt.refcount > 0) 1249 h->plt.refcount -= 1; 1250 } 1251 break; 1252 1253 default: 1254 break; 1255 } 1256 } 1257 1258 return TRUE; 1259} 1260 1261/* Adjust a symbol defined by a dynamic object and referenced by a 1262 regular object. The current definition is in some section of the 1263 dynamic object, but we're not including those sections. We have to 1264 change the definition to something the rest of the link can 1265 understand. */ 1266 1267static bfd_boolean 1268elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info, 1269 struct elf_link_hash_entry *h) 1270{ 1271 struct elf64_x86_64_link_hash_table *htab; 1272 asection *s; 1273 unsigned int power_of_two; 1274 1275 /* If this is a function, put it in the procedure linkage table. We 1276 will fill in the contents of the procedure linkage table later, 1277 when we know the address of the .got section. */ 1278 if (h->type == STT_FUNC 1279 || h->needs_plt) 1280 { 1281 if (h->plt.refcount <= 0 1282 || SYMBOL_CALLS_LOCAL (info, h) 1283 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1284 && h->root.type == bfd_link_hash_undefweak)) 1285 { 1286 /* This case can occur if we saw a PLT32 reloc in an input 1287 file, but the symbol was never referred to by a dynamic 1288 object, or if all references were garbage collected. In 1289 such a case, we don't actually need to build a procedure 1290 linkage table, and we can just do a PC32 reloc instead. */ 1291 h->plt.offset = (bfd_vma) -1; 1292 h->needs_plt = 0; 1293 } 1294 1295 return TRUE; 1296 } 1297 else 1298 /* It's possible that we incorrectly decided a .plt reloc was 1299 needed for an R_X86_64_PC32 reloc to a non-function sym in 1300 check_relocs. We can't decide accurately between function and 1301 non-function syms in check-relocs; Objects loaded later in 1302 the link may change h->type. So fix it now. */ 1303 h->plt.offset = (bfd_vma) -1; 1304 1305 /* If this is a weak symbol, and there is a real definition, the 1306 processor independent code will have arranged for us to see the 1307 real definition first, and we can just use the same value. */ 1308 if (h->u.weakdef != NULL) 1309 { 1310 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1311 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1312 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1313 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1314 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1315 h->non_got_ref = h->u.weakdef->non_got_ref; 1316 return TRUE; 1317 } 1318 1319 /* This is a reference to a symbol defined by a dynamic object which 1320 is not a function. */ 1321 1322 /* If we are creating a shared library, we must presume that the 1323 only references to the symbol are via the global offset table. 1324 For such cases we need not do anything here; the relocations will 1325 be handled correctly by relocate_section. */ 1326 if (info->shared) 1327 return TRUE; 1328 1329 /* If there are no references to this symbol that do not use the 1330 GOT, we don't need to generate a copy reloc. */ 1331 if (!h->non_got_ref) 1332 return TRUE; 1333 1334 /* If -z nocopyreloc was given, we won't generate them either. */ 1335 if (info->nocopyreloc) 1336 { 1337 h->non_got_ref = 0; 1338 return TRUE; 1339 } 1340 1341 if (ELIMINATE_COPY_RELOCS) 1342 { 1343 struct elf64_x86_64_link_hash_entry * eh; 1344 struct elf64_x86_64_dyn_relocs *p; 1345 1346 eh = (struct elf64_x86_64_link_hash_entry *) h; 1347 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1348 { 1349 s = p->sec->output_section; 1350 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1351 break; 1352 } 1353 1354 /* If we didn't find any dynamic relocs in read-only sections, then 1355 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1356 if (p == NULL) 1357 { 1358 h->non_got_ref = 0; 1359 return TRUE; 1360 } 1361 } 1362 1363 if (h->size == 0) 1364 { 1365 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 1366 h->root.root.string); 1367 return TRUE; 1368 } 1369 1370 /* We must allocate the symbol in our .dynbss section, which will 1371 become part of the .bss section of the executable. There will be 1372 an entry for this symbol in the .dynsym section. The dynamic 1373 object will contain position independent code, so all references 1374 from the dynamic object to this symbol will go through the global 1375 offset table. The dynamic linker will use the .dynsym entry to 1376 determine the address it must put in the global offset table, so 1377 both the dynamic object and the regular object will refer to the 1378 same memory location for the variable. */ 1379 1380 htab = elf64_x86_64_hash_table (info); 1381 1382 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker 1383 to copy the initial value out of the dynamic object and into the 1384 runtime process image. */ 1385 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1386 { 1387 htab->srelbss->size += sizeof (Elf64_External_Rela); 1388 h->needs_copy = 1; 1389 } 1390 1391 /* We need to figure out the alignment required for this symbol. I 1392 have no idea how ELF linkers handle this. 16-bytes is the size 1393 of the largest type that requires hard alignment -- long double. */ 1394 /* FIXME: This is VERY ugly. Should be fixed for all architectures using 1395 this construct. */ 1396 power_of_two = bfd_log2 (h->size); 1397 if (power_of_two > 4) 1398 power_of_two = 4; 1399 1400 /* Apply the required alignment. */ 1401 s = htab->sdynbss; 1402 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 1403 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) 1404 { 1405 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) 1406 return FALSE; 1407 } 1408 1409 /* Define the symbol as being at this point in the section. */ 1410 h->root.u.def.section = s; 1411 h->root.u.def.value = s->size; 1412 1413 /* Increment the section size to make room for the symbol. */ 1414 s->size += h->size; 1415 1416 return TRUE; 1417} 1418 1419/* Allocate space in .plt, .got and associated reloc sections for 1420 dynamic relocs. */ 1421 1422static bfd_boolean 1423allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) 1424{ 1425 struct bfd_link_info *info; 1426 struct elf64_x86_64_link_hash_table *htab; 1427 struct elf64_x86_64_link_hash_entry *eh; 1428 struct elf64_x86_64_dyn_relocs *p; 1429 1430 if (h->root.type == bfd_link_hash_indirect) 1431 return TRUE; 1432 1433 if (h->root.type == bfd_link_hash_warning) 1434 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1435 1436 info = (struct bfd_link_info *) inf; 1437 htab = elf64_x86_64_hash_table (info); 1438 1439 if (htab->elf.dynamic_sections_created 1440 && h->plt.refcount > 0) 1441 { 1442 /* Make sure this symbol is output as a dynamic symbol. 1443 Undefined weak syms won't yet be marked as dynamic. */ 1444 if (h->dynindx == -1 1445 && !h->forced_local) 1446 { 1447 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1448 return FALSE; 1449 } 1450 1451 if (info->shared 1452 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1453 { 1454 asection *s = htab->splt; 1455 1456 /* If this is the first .plt entry, make room for the special 1457 first entry. */ 1458 if (s->size == 0) 1459 s->size += PLT_ENTRY_SIZE; 1460 1461 h->plt.offset = s->size; 1462 1463 /* If this symbol is not defined in a regular file, and we are 1464 not generating a shared library, then set the symbol to this 1465 location in the .plt. This is required to make function 1466 pointers compare as equal between the normal executable and 1467 the shared library. */ 1468 if (! info->shared 1469 && !h->def_regular) 1470 { 1471 h->root.u.def.section = s; 1472 h->root.u.def.value = h->plt.offset; 1473 } 1474 1475 /* Make room for this entry. */ 1476 s->size += PLT_ENTRY_SIZE; 1477 1478 /* We also need to make an entry in the .got.plt section, which 1479 will be placed in the .got section by the linker script. */ 1480 htab->sgotplt->size += GOT_ENTRY_SIZE; 1481 1482 /* We also need to make an entry in the .rela.plt section. */ 1483 htab->srelplt->size += sizeof (Elf64_External_Rela); 1484 htab->srelplt->reloc_count++; 1485 } 1486 else 1487 { 1488 h->plt.offset = (bfd_vma) -1; 1489 h->needs_plt = 0; 1490 } 1491 } 1492 else 1493 { 1494 h->plt.offset = (bfd_vma) -1; 1495 h->needs_plt = 0; 1496 } 1497 1498 eh = (struct elf64_x86_64_link_hash_entry *) h; 1499 eh->tlsdesc_got = (bfd_vma) -1; 1500 1501 /* If R_X86_64_GOTTPOFF symbol is now local to the binary, 1502 make it a R_X86_64_TPOFF32 requiring no GOT entry. */ 1503 if (h->got.refcount > 0 1504 && !info->shared 1505 && h->dynindx == -1 1506 && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE) 1507 h->got.offset = (bfd_vma) -1; 1508 else if (h->got.refcount > 0) 1509 { 1510 asection *s; 1511 bfd_boolean dyn; 1512 int tls_type = elf64_x86_64_hash_entry (h)->tls_type; 1513 1514 /* Make sure this symbol is output as a dynamic symbol. 1515 Undefined weak syms won't yet be marked as dynamic. */ 1516 if (h->dynindx == -1 1517 && !h->forced_local) 1518 { 1519 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1520 return FALSE; 1521 } 1522 1523 if (GOT_TLS_GDESC_P (tls_type)) 1524 { 1525 eh->tlsdesc_got = htab->sgotplt->size 1526 - elf64_x86_64_compute_jump_table_size (htab); 1527 htab->sgotplt->size += 2 * GOT_ENTRY_SIZE; 1528 h->got.offset = (bfd_vma) -2; 1529 } 1530 if (! GOT_TLS_GDESC_P (tls_type) 1531 || GOT_TLS_GD_P (tls_type)) 1532 { 1533 s = htab->sgot; 1534 h->got.offset = s->size; 1535 s->size += GOT_ENTRY_SIZE; 1536 if (GOT_TLS_GD_P (tls_type)) 1537 s->size += GOT_ENTRY_SIZE; 1538 } 1539 dyn = htab->elf.dynamic_sections_created; 1540 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol 1541 and two if global. 1542 R_X86_64_GOTTPOFF needs one dynamic relocation. */ 1543 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) 1544 || tls_type == GOT_TLS_IE) 1545 htab->srelgot->size += sizeof (Elf64_External_Rela); 1546 else if (GOT_TLS_GD_P (tls_type)) 1547 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela); 1548 else if (! GOT_TLS_GDESC_P (tls_type) 1549 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1550 || h->root.type != bfd_link_hash_undefweak) 1551 && (info->shared 1552 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1553 htab->srelgot->size += sizeof (Elf64_External_Rela); 1554 if (GOT_TLS_GDESC_P (tls_type)) 1555 { 1556 htab->srelplt->size += sizeof (Elf64_External_Rela); 1557 htab->tlsdesc_plt = (bfd_vma) -1; 1558 } 1559 } 1560 else 1561 h->got.offset = (bfd_vma) -1; 1562 1563 if (eh->dyn_relocs == NULL) 1564 return TRUE; 1565 1566 /* In the shared -Bsymbolic case, discard space allocated for 1567 dynamic pc-relative relocs against symbols which turn out to be 1568 defined in regular objects. For the normal shared case, discard 1569 space for pc-relative relocs that have become local due to symbol 1570 visibility changes. */ 1571 1572 if (info->shared) 1573 { 1574 /* Relocs that use pc_count are those that appear on a call 1575 insn, or certain REL relocs that can generated via assembly. 1576 We want calls to protected symbols to resolve directly to the 1577 function rather than going via the plt. If people want 1578 function pointer comparisons to work as expected then they 1579 should avoid writing weird assembly. */ 1580 if (SYMBOL_CALLS_LOCAL (info, h)) 1581 { 1582 struct elf64_x86_64_dyn_relocs **pp; 1583 1584 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1585 { 1586 p->count -= p->pc_count; 1587 p->pc_count = 0; 1588 if (p->count == 0) 1589 *pp = p->next; 1590 else 1591 pp = &p->next; 1592 } 1593 } 1594 1595 /* Also discard relocs on undefined weak syms with non-default 1596 visibility. */ 1597 if (eh->dyn_relocs != NULL 1598 && h->root.type == bfd_link_hash_undefweak) 1599 { 1600 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1601 eh->dyn_relocs = NULL; 1602 1603 /* Make sure undefined weak symbols are output as a dynamic 1604 symbol in PIEs. */ 1605 else if (h->dynindx == -1 1606 && !h->forced_local) 1607 { 1608 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1609 return FALSE; 1610 } 1611 } 1612 } 1613 else if (ELIMINATE_COPY_RELOCS) 1614 { 1615 /* For the non-shared case, discard space for relocs against 1616 symbols which turn out to need copy relocs or are not 1617 dynamic. */ 1618 1619 if (!h->non_got_ref 1620 && ((h->def_dynamic 1621 && !h->def_regular) 1622 || (htab->elf.dynamic_sections_created 1623 && (h->root.type == bfd_link_hash_undefweak 1624 || h->root.type == bfd_link_hash_undefined)))) 1625 { 1626 /* Make sure this symbol is output as a dynamic symbol. 1627 Undefined weak syms won't yet be marked as dynamic. */ 1628 if (h->dynindx == -1 1629 && !h->forced_local) 1630 { 1631 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1632 return FALSE; 1633 } 1634 1635 /* If that succeeded, we know we'll be keeping all the 1636 relocs. */ 1637 if (h->dynindx != -1) 1638 goto keep; 1639 } 1640 1641 eh->dyn_relocs = NULL; 1642 1643 keep: ; 1644 } 1645 1646 /* Finally, allocate space. */ 1647 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1648 { 1649 asection *sreloc = elf_section_data (p->sec)->sreloc; 1650 sreloc->size += p->count * sizeof (Elf64_External_Rela); 1651 } 1652 1653 return TRUE; 1654} 1655 1656/* Find any dynamic relocs that apply to read-only sections. */ 1657 1658static bfd_boolean 1659readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf) 1660{ 1661 struct elf64_x86_64_link_hash_entry *eh; 1662 struct elf64_x86_64_dyn_relocs *p; 1663 1664 if (h->root.type == bfd_link_hash_warning) 1665 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1666 1667 eh = (struct elf64_x86_64_link_hash_entry *) h; 1668 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1669 { 1670 asection *s = p->sec->output_section; 1671 1672 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1673 { 1674 struct bfd_link_info *info = (struct bfd_link_info *) inf; 1675 1676 info->flags |= DF_TEXTREL; 1677 1678 /* Not an error, just cut short the traversal. */ 1679 return FALSE; 1680 } 1681 } 1682 return TRUE; 1683} 1684 1685/* Set the sizes of the dynamic sections. */ 1686 1687static bfd_boolean 1688elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 1689 struct bfd_link_info *info) 1690{ 1691 struct elf64_x86_64_link_hash_table *htab; 1692 bfd *dynobj; 1693 asection *s; 1694 bfd_boolean relocs; 1695 bfd *ibfd; 1696 1697 htab = elf64_x86_64_hash_table (info); 1698 dynobj = htab->elf.dynobj; 1699 if (dynobj == NULL) 1700 abort (); 1701 1702 if (htab->elf.dynamic_sections_created) 1703 { 1704 /* Set the contents of the .interp section to the interpreter. */ 1705 if (info->executable) 1706 { 1707 s = bfd_get_section_by_name (dynobj, ".interp"); 1708 if (s == NULL) 1709 abort (); 1710 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1711 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1712 } 1713 } 1714 1715 /* Set up .got offsets for local syms, and space for local dynamic 1716 relocs. */ 1717 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 1718 { 1719 bfd_signed_vma *local_got; 1720 bfd_signed_vma *end_local_got; 1721 char *local_tls_type; 1722 bfd_vma *local_tlsdesc_gotent; 1723 bfd_size_type locsymcount; 1724 Elf_Internal_Shdr *symtab_hdr; 1725 asection *srel; 1726 1727 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 1728 continue; 1729 1730 for (s = ibfd->sections; s != NULL; s = s->next) 1731 { 1732 struct elf64_x86_64_dyn_relocs *p; 1733 1734 for (p = (struct elf64_x86_64_dyn_relocs *) 1735 (elf_section_data (s)->local_dynrel); 1736 p != NULL; 1737 p = p->next) 1738 { 1739 if (!bfd_is_abs_section (p->sec) 1740 && bfd_is_abs_section (p->sec->output_section)) 1741 { 1742 /* Input section has been discarded, either because 1743 it is a copy of a linkonce section or due to 1744 linker script /DISCARD/, so we'll be discarding 1745 the relocs too. */ 1746 } 1747 else if (p->count != 0) 1748 { 1749 srel = elf_section_data (p->sec)->sreloc; 1750 srel->size += p->count * sizeof (Elf64_External_Rela); 1751 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 1752 info->flags |= DF_TEXTREL; 1753 1754 } 1755 } 1756 } 1757 1758 local_got = elf_local_got_refcounts (ibfd); 1759 if (!local_got) 1760 continue; 1761 1762 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 1763 locsymcount = symtab_hdr->sh_info; 1764 end_local_got = local_got + locsymcount; 1765 local_tls_type = elf64_x86_64_local_got_tls_type (ibfd); 1766 local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd); 1767 s = htab->sgot; 1768 srel = htab->srelgot; 1769 for (; local_got < end_local_got; 1770 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) 1771 { 1772 *local_tlsdesc_gotent = (bfd_vma) -1; 1773 if (*local_got > 0) 1774 { 1775 if (GOT_TLS_GDESC_P (*local_tls_type)) 1776 { 1777 *local_tlsdesc_gotent = htab->sgotplt->size 1778 - elf64_x86_64_compute_jump_table_size (htab); 1779 htab->sgotplt->size += 2 * GOT_ENTRY_SIZE; 1780 *local_got = (bfd_vma) -2; 1781 } 1782 if (! GOT_TLS_GDESC_P (*local_tls_type) 1783 || GOT_TLS_GD_P (*local_tls_type)) 1784 { 1785 *local_got = s->size; 1786 s->size += GOT_ENTRY_SIZE; 1787 if (GOT_TLS_GD_P (*local_tls_type)) 1788 s->size += GOT_ENTRY_SIZE; 1789 } 1790 if (info->shared 1791 || GOT_TLS_GD_ANY_P (*local_tls_type) 1792 || *local_tls_type == GOT_TLS_IE) 1793 { 1794 if (GOT_TLS_GDESC_P (*local_tls_type)) 1795 { 1796 htab->srelplt->size += sizeof (Elf64_External_Rela); 1797 htab->tlsdesc_plt = (bfd_vma) -1; 1798 } 1799 if (! GOT_TLS_GDESC_P (*local_tls_type) 1800 || GOT_TLS_GD_P (*local_tls_type)) 1801 srel->size += sizeof (Elf64_External_Rela); 1802 } 1803 } 1804 else 1805 *local_got = (bfd_vma) -1; 1806 } 1807 } 1808 1809 if (htab->tls_ld_got.refcount > 0) 1810 { 1811 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD 1812 relocs. */ 1813 htab->tls_ld_got.offset = htab->sgot->size; 1814 htab->sgot->size += 2 * GOT_ENTRY_SIZE; 1815 htab->srelgot->size += sizeof (Elf64_External_Rela); 1816 } 1817 else 1818 htab->tls_ld_got.offset = -1; 1819 1820 /* Allocate global sym .plt and .got entries, and space for global 1821 sym dynamic relocs. */ 1822 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); 1823 1824 /* For every jump slot reserved in the sgotplt, reloc_count is 1825 incremented. However, when we reserve space for TLS descriptors, 1826 it's not incremented, so in order to compute the space reserved 1827 for them, it suffices to multiply the reloc count by the jump 1828 slot size. */ 1829 if (htab->srelplt) 1830 htab->sgotplt_jump_table_size 1831 = elf64_x86_64_compute_jump_table_size (htab); 1832 1833 if (htab->tlsdesc_plt) 1834 { 1835 /* If we're not using lazy TLS relocations, don't generate the 1836 PLT and GOT entries they require. */ 1837 if ((info->flags & DF_BIND_NOW)) 1838 htab->tlsdesc_plt = 0; 1839 else 1840 { 1841 htab->tlsdesc_got = htab->sgot->size; 1842 htab->sgot->size += GOT_ENTRY_SIZE; 1843 /* Reserve room for the initial entry. 1844 FIXME: we could probably do away with it in this case. */ 1845 if (htab->splt->size == 0) 1846 htab->splt->size += PLT_ENTRY_SIZE; 1847 htab->tlsdesc_plt = htab->splt->size; 1848 htab->splt->size += PLT_ENTRY_SIZE; 1849 } 1850 } 1851 1852 /* We now have determined the sizes of the various dynamic sections. 1853 Allocate memory for them. */ 1854 relocs = FALSE; 1855 for (s = dynobj->sections; s != NULL; s = s->next) 1856 { 1857 if ((s->flags & SEC_LINKER_CREATED) == 0) 1858 continue; 1859 1860 if (s == htab->splt 1861 || s == htab->sgot 1862 || s == htab->sgotplt 1863 || s == htab->sdynbss) 1864 { 1865 /* Strip this section if we don't need it; see the 1866 comment below. */ 1867 } 1868 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 1869 { 1870 if (s->size != 0 && s != htab->srelplt) 1871 relocs = TRUE; 1872 1873 /* We use the reloc_count field as a counter if we need 1874 to copy relocs into the output file. */ 1875 if (s != htab->srelplt) 1876 s->reloc_count = 0; 1877 } 1878 else 1879 { 1880 /* It's not one of our sections, so don't allocate space. */ 1881 continue; 1882 } 1883 1884 if (s->size == 0) 1885 { 1886 /* If we don't need this section, strip it from the 1887 output file. This is mostly to handle .rela.bss and 1888 .rela.plt. We must create both sections in 1889 create_dynamic_sections, because they must be created 1890 before the linker maps input sections to output 1891 sections. The linker does that before 1892 adjust_dynamic_symbol is called, and it is that 1893 function which decides whether anything needs to go 1894 into these sections. */ 1895 1896 s->flags |= SEC_EXCLUDE; 1897 continue; 1898 } 1899 1900 if ((s->flags & SEC_HAS_CONTENTS) == 0) 1901 continue; 1902 1903 /* Allocate memory for the section contents. We use bfd_zalloc 1904 here in case unused entries are not reclaimed before the 1905 section's contents are written out. This should not happen, 1906 but this way if it does, we get a R_X86_64_NONE reloc instead 1907 of garbage. */ 1908 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); 1909 if (s->contents == NULL) 1910 return FALSE; 1911 } 1912 1913 if (htab->elf.dynamic_sections_created) 1914 { 1915 /* Add some entries to the .dynamic section. We fill in the 1916 values later, in elf64_x86_64_finish_dynamic_sections, but we 1917 must add the entries now so that we get the correct size for 1918 the .dynamic section. The DT_DEBUG entry is filled in by the 1919 dynamic linker and used by the debugger. */ 1920#define add_dynamic_entry(TAG, VAL) \ 1921 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 1922 1923 if (info->executable) 1924 { 1925 if (!add_dynamic_entry (DT_DEBUG, 0)) 1926 return FALSE; 1927 } 1928 1929 if (htab->splt->size != 0) 1930 { 1931 if (!add_dynamic_entry (DT_PLTGOT, 0) 1932 || !add_dynamic_entry (DT_PLTRELSZ, 0) 1933 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 1934 || !add_dynamic_entry (DT_JMPREL, 0)) 1935 return FALSE; 1936 1937 if (htab->tlsdesc_plt 1938 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0) 1939 || !add_dynamic_entry (DT_TLSDESC_GOT, 0))) 1940 return FALSE; 1941 } 1942 1943 if (relocs) 1944 { 1945 if (!add_dynamic_entry (DT_RELA, 0) 1946 || !add_dynamic_entry (DT_RELASZ, 0) 1947 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) 1948 return FALSE; 1949 1950 /* If any dynamic relocs apply to a read-only section, 1951 then we need a DT_TEXTREL entry. */ 1952 if ((info->flags & DF_TEXTREL) == 0) 1953 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, 1954 (PTR) info); 1955 1956 if ((info->flags & DF_TEXTREL) != 0) 1957 { 1958 if (!add_dynamic_entry (DT_TEXTREL, 0)) 1959 return FALSE; 1960 } 1961 } 1962 } 1963#undef add_dynamic_entry 1964 1965 return TRUE; 1966} 1967 1968static bfd_boolean 1969elf64_x86_64_always_size_sections (bfd *output_bfd, 1970 struct bfd_link_info *info) 1971{ 1972 asection *tls_sec = elf_hash_table (info)->tls_sec; 1973 1974 if (tls_sec) 1975 { 1976 struct elf_link_hash_entry *tlsbase; 1977 1978 tlsbase = elf_link_hash_lookup (elf_hash_table (info), 1979 "_TLS_MODULE_BASE_", 1980 FALSE, FALSE, FALSE); 1981 1982 if (tlsbase && tlsbase->type == STT_TLS) 1983 { 1984 struct bfd_link_hash_entry *bh = NULL; 1985 const struct elf_backend_data *bed 1986 = get_elf_backend_data (output_bfd); 1987 1988 if (!(_bfd_generic_link_add_one_symbol 1989 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, 1990 tls_sec, 0, NULL, FALSE, 1991 bed->collect, &bh))) 1992 return FALSE; 1993 tlsbase = (struct elf_link_hash_entry *)bh; 1994 tlsbase->def_regular = 1; 1995 tlsbase->other = STV_HIDDEN; 1996 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); 1997 } 1998 } 1999 2000 return TRUE; 2001} 2002 2003/* Return the base VMA address which should be subtracted from real addresses 2004 when resolving @dtpoff relocation. 2005 This is PT_TLS segment p_vaddr. */ 2006 2007static bfd_vma 2008dtpoff_base (struct bfd_link_info *info) 2009{ 2010 /* If tls_sec is NULL, we should have signalled an error already. */ 2011 if (elf_hash_table (info)->tls_sec == NULL) 2012 return 0; 2013 return elf_hash_table (info)->tls_sec->vma; 2014} 2015 2016/* Return the relocation value for @tpoff relocation 2017 if STT_TLS virtual address is ADDRESS. */ 2018 2019static bfd_vma 2020tpoff (struct bfd_link_info *info, bfd_vma address) 2021{ 2022 struct elf_link_hash_table *htab = elf_hash_table (info); 2023 2024 /* If tls_segment is NULL, we should have signalled an error already. */ 2025 if (htab->tls_sec == NULL) 2026 return 0; 2027 return address - htab->tls_size - htab->tls_sec->vma; 2028} 2029 2030/* Is the instruction before OFFSET in CONTENTS a 32bit relative 2031 branch? */ 2032 2033static bfd_boolean 2034is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset) 2035{ 2036 /* Opcode Instruction 2037 0xe8 call 2038 0xe9 jump 2039 0x0f 0x8x conditional jump */ 2040 return ((offset > 0 2041 && (contents [offset - 1] == 0xe8 2042 || contents [offset - 1] == 0xe9)) 2043 || (offset > 1 2044 && contents [offset - 2] == 0x0f 2045 && (contents [offset - 1] & 0xf0) == 0x80)); 2046} 2047 2048/* Relocate an x86_64 ELF section. */ 2049 2050static bfd_boolean 2051elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info, 2052 bfd *input_bfd, asection *input_section, 2053 bfd_byte *contents, Elf_Internal_Rela *relocs, 2054 Elf_Internal_Sym *local_syms, 2055 asection **local_sections) 2056{ 2057 struct elf64_x86_64_link_hash_table *htab; 2058 Elf_Internal_Shdr *symtab_hdr; 2059 struct elf_link_hash_entry **sym_hashes; 2060 bfd_vma *local_got_offsets; 2061 bfd_vma *local_tlsdesc_gotents; 2062 Elf_Internal_Rela *rel; 2063 Elf_Internal_Rela *relend; 2064 2065 if (info->relocatable) 2066 return TRUE; 2067 2068 htab = elf64_x86_64_hash_table (info); 2069 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2070 sym_hashes = elf_sym_hashes (input_bfd); 2071 local_got_offsets = elf_local_got_offsets (input_bfd); 2072 local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd); 2073 2074 rel = relocs; 2075 relend = relocs + input_section->reloc_count; 2076 for (; rel < relend; rel++) 2077 { 2078 unsigned int r_type; 2079 reloc_howto_type *howto; 2080 unsigned long r_symndx; 2081 struct elf_link_hash_entry *h; 2082 Elf_Internal_Sym *sym; 2083 asection *sec; 2084 bfd_vma off, offplt; 2085 bfd_vma relocation; 2086 bfd_boolean unresolved_reloc; 2087 bfd_reloc_status_type r; 2088 int tls_type; 2089 2090 r_type = ELF64_R_TYPE (rel->r_info); 2091 if (r_type == (int) R_X86_64_GNU_VTINHERIT 2092 || r_type == (int) R_X86_64_GNU_VTENTRY) 2093 continue; 2094 2095 if (r_type >= R_X86_64_max) 2096 { 2097 bfd_set_error (bfd_error_bad_value); 2098 return FALSE; 2099 } 2100 2101 howto = x86_64_elf_howto_table + r_type; 2102 r_symndx = ELF64_R_SYM (rel->r_info); 2103 h = NULL; 2104 sym = NULL; 2105 sec = NULL; 2106 unresolved_reloc = FALSE; 2107 if (r_symndx < symtab_hdr->sh_info) 2108 { 2109 sym = local_syms + r_symndx; 2110 sec = local_sections[r_symndx]; 2111 2112 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 2113 } 2114 else 2115 { 2116 bfd_boolean warned; 2117 2118 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2119 r_symndx, symtab_hdr, sym_hashes, 2120 h, sec, relocation, 2121 unresolved_reloc, warned); 2122 } 2123 /* When generating a shared object, the relocations handled here are 2124 copied into the output file to be resolved at run time. */ 2125 switch (r_type) 2126 { 2127 asection *base_got; 2128 case R_X86_64_GOT32: 2129 case R_X86_64_GOT64: 2130 /* Relocation is to the entry for this symbol in the global 2131 offset table. */ 2132 case R_X86_64_GOTPCREL: 2133 case R_X86_64_GOTPCREL64: 2134 /* Use global offset table entry as symbol value. */ 2135 case R_X86_64_GOTPLT64: 2136 /* This is the same as GOT64 for relocation purposes, but 2137 indicates the existence of a PLT entry. The difficulty is, 2138 that we must calculate the GOT slot offset from the PLT 2139 offset, if this symbol got a PLT entry (it was global). 2140 Additionally if it's computed from the PLT entry, then that 2141 GOT offset is relative to .got.plt, not to .got. */ 2142 base_got = htab->sgot; 2143 2144 if (htab->sgot == NULL) 2145 abort (); 2146 2147 if (h != NULL) 2148 { 2149 bfd_boolean dyn; 2150 2151 off = h->got.offset; 2152 if (h->needs_plt 2153 && h->plt.offset != (bfd_vma)-1 2154 && off == (bfd_vma)-1) 2155 { 2156 /* We can't use h->got.offset here to save 2157 state, or even just remember the offset, as 2158 finish_dynamic_symbol would use that as offset into 2159 .got. */ 2160 bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 2161 off = (plt_index + 3) * GOT_ENTRY_SIZE; 2162 base_got = htab->sgotplt; 2163 } 2164 2165 dyn = htab->elf.dynamic_sections_created; 2166 2167 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2168 || (info->shared 2169 && SYMBOL_REFERENCES_LOCAL (info, h)) 2170 || (ELF_ST_VISIBILITY (h->other) 2171 && h->root.type == bfd_link_hash_undefweak)) 2172 { 2173 /* This is actually a static link, or it is a -Bsymbolic 2174 link and the symbol is defined locally, or the symbol 2175 was forced to be local because of a version file. We 2176 must initialize this entry in the global offset table. 2177 Since the offset must always be a multiple of 8, we 2178 use the least significant bit to record whether we 2179 have initialized it already. 2180 2181 When doing a dynamic link, we create a .rela.got 2182 relocation entry to initialize the value. This is 2183 done in the finish_dynamic_symbol routine. */ 2184 if ((off & 1) != 0) 2185 off &= ~1; 2186 else 2187 { 2188 bfd_put_64 (output_bfd, relocation, 2189 base_got->contents + off); 2190 /* Note that this is harmless for the GOTPLT64 case, 2191 as -1 | 1 still is -1. */ 2192 h->got.offset |= 1; 2193 } 2194 } 2195 else 2196 unresolved_reloc = FALSE; 2197 } 2198 else 2199 { 2200 if (local_got_offsets == NULL) 2201 abort (); 2202 2203 off = local_got_offsets[r_symndx]; 2204 2205 /* The offset must always be a multiple of 8. We use 2206 the least significant bit to record whether we have 2207 already generated the necessary reloc. */ 2208 if ((off & 1) != 0) 2209 off &= ~1; 2210 else 2211 { 2212 bfd_put_64 (output_bfd, relocation, 2213 base_got->contents + off); 2214 2215 if (info->shared) 2216 { 2217 asection *s; 2218 Elf_Internal_Rela outrel; 2219 bfd_byte *loc; 2220 2221 /* We need to generate a R_X86_64_RELATIVE reloc 2222 for the dynamic linker. */ 2223 s = htab->srelgot; 2224 if (s == NULL) 2225 abort (); 2226 2227 outrel.r_offset = (base_got->output_section->vma 2228 + base_got->output_offset 2229 + off); 2230 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); 2231 outrel.r_addend = relocation; 2232 loc = s->contents; 2233 loc += s->reloc_count++ * sizeof (Elf64_External_Rela); 2234 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2235 } 2236 2237 local_got_offsets[r_symndx] |= 1; 2238 } 2239 } 2240 2241 if (off >= (bfd_vma) -2) 2242 abort (); 2243 2244 relocation = base_got->output_section->vma 2245 + base_got->output_offset + off; 2246 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64) 2247 relocation -= htab->sgotplt->output_section->vma 2248 - htab->sgotplt->output_offset; 2249 2250 break; 2251 2252 case R_X86_64_GOTOFF64: 2253 /* Relocation is relative to the start of the global offset 2254 table. */ 2255 2256 /* Check to make sure it isn't a protected function symbol 2257 for shared library since it may not be local when used 2258 as function address. */ 2259 if (info->shared 2260 && h 2261 && h->def_regular 2262 && h->type == STT_FUNC 2263 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) 2264 { 2265 (*_bfd_error_handler) 2266 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"), 2267 input_bfd, h->root.root.string); 2268 bfd_set_error (bfd_error_bad_value); 2269 return FALSE; 2270 } 2271 2272 /* Note that sgot is not involved in this 2273 calculation. We always want the start of .got.plt. If we 2274 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is 2275 permitted by the ABI, we might have to change this 2276 calculation. */ 2277 relocation -= htab->sgotplt->output_section->vma 2278 + htab->sgotplt->output_offset; 2279 break; 2280 2281 case R_X86_64_GOTPC32: 2282 case R_X86_64_GOTPC64: 2283 /* Use global offset table as symbol value. */ 2284 relocation = htab->sgotplt->output_section->vma 2285 + htab->sgotplt->output_offset; 2286 unresolved_reloc = FALSE; 2287 break; 2288 2289 case R_X86_64_PLTOFF64: 2290 /* Relocation is PLT entry relative to GOT. For local 2291 symbols it's the symbol itself relative to GOT. */ 2292 if (h != NULL 2293 /* See PLT32 handling. */ 2294 && h->plt.offset != (bfd_vma) -1 2295 && htab->splt != NULL) 2296 { 2297 relocation = (htab->splt->output_section->vma 2298 + htab->splt->output_offset 2299 + h->plt.offset); 2300 unresolved_reloc = FALSE; 2301 } 2302 2303 relocation -= htab->sgotplt->output_section->vma 2304 + htab->sgotplt->output_offset; 2305 break; 2306 2307 case R_X86_64_PLT32: 2308 /* Relocation is to the entry for this symbol in the 2309 procedure linkage table. */ 2310 2311 /* Resolve a PLT32 reloc against a local symbol directly, 2312 without using the procedure linkage table. */ 2313 if (h == NULL) 2314 break; 2315 2316 if (h->plt.offset == (bfd_vma) -1 2317 || htab->splt == NULL) 2318 { 2319 /* We didn't make a PLT entry for this symbol. This 2320 happens when statically linking PIC code, or when 2321 using -Bsymbolic. */ 2322 break; 2323 } 2324 2325 relocation = (htab->splt->output_section->vma 2326 + htab->splt->output_offset 2327 + h->plt.offset); 2328 unresolved_reloc = FALSE; 2329 break; 2330 2331 case R_X86_64_PC8: 2332 case R_X86_64_PC16: 2333 case R_X86_64_PC32: 2334 if (info->shared 2335 && !SYMBOL_REFERENCES_LOCAL (info, h) 2336 && (input_section->flags & SEC_ALLOC) != 0 2337 && (input_section->flags & SEC_READONLY) != 0 2338 && (!h->def_regular 2339 || r_type != R_X86_64_PC32 2340 || h->type != STT_FUNC 2341 || ELF_ST_VISIBILITY (h->other) != STV_PROTECTED 2342 || !is_32bit_relative_branch (contents, 2343 rel->r_offset))) 2344 { 2345 if (h->def_regular 2346 && r_type == R_X86_64_PC32 2347 && h->type == STT_FUNC 2348 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) 2349 (*_bfd_error_handler) 2350 (_("%B: relocation R_X86_64_PC32 against protected function `%s' can not be used when making a shared object"), 2351 input_bfd, h->root.root.string); 2352 else 2353 (*_bfd_error_handler) 2354 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), 2355 input_bfd, x86_64_elf_howto_table[r_type].name, 2356 h->root.root.string); 2357 bfd_set_error (bfd_error_bad_value); 2358 return FALSE; 2359 } 2360 /* Fall through. */ 2361 2362 case R_X86_64_8: 2363 case R_X86_64_16: 2364 case R_X86_64_32: 2365 case R_X86_64_PC64: 2366 case R_X86_64_64: 2367 /* FIXME: The ABI says the linker should make sure the value is 2368 the same when it's zeroextended to 64 bit. */ 2369 2370 /* r_symndx will be zero only for relocs against symbols 2371 from removed linkonce sections, or sections discarded by 2372 a linker script. */ 2373 if (r_symndx == 0) 2374 { 2375 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); 2376 break; 2377 } 2378 2379 if ((input_section->flags & SEC_ALLOC) == 0) 2380 break; 2381 2382 if ((info->shared 2383 && (h == NULL 2384 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2385 || h->root.type != bfd_link_hash_undefweak) 2386 && ((r_type != R_X86_64_PC8 2387 && r_type != R_X86_64_PC16 2388 && r_type != R_X86_64_PC32 2389 && r_type != R_X86_64_PC64) 2390 || !SYMBOL_CALLS_LOCAL (info, h))) 2391 || (ELIMINATE_COPY_RELOCS 2392 && !info->shared 2393 && h != NULL 2394 && h->dynindx != -1 2395 && !h->non_got_ref 2396 && ((h->def_dynamic 2397 && !h->def_regular) 2398 || h->root.type == bfd_link_hash_undefweak 2399 || h->root.type == bfd_link_hash_undefined))) 2400 { 2401 Elf_Internal_Rela outrel; 2402 bfd_byte *loc; 2403 bfd_boolean skip, relocate; 2404 asection *sreloc; 2405 2406 /* When generating a shared object, these relocations 2407 are copied into the output file to be resolved at run 2408 time. */ 2409 skip = FALSE; 2410 relocate = FALSE; 2411 2412 outrel.r_offset = 2413 _bfd_elf_section_offset (output_bfd, info, input_section, 2414 rel->r_offset); 2415 if (outrel.r_offset == (bfd_vma) -1) 2416 skip = TRUE; 2417 else if (outrel.r_offset == (bfd_vma) -2) 2418 skip = TRUE, relocate = TRUE; 2419 2420 outrel.r_offset += (input_section->output_section->vma 2421 + input_section->output_offset); 2422 2423 if (skip) 2424 memset (&outrel, 0, sizeof outrel); 2425 2426 /* h->dynindx may be -1 if this symbol was marked to 2427 become local. */ 2428 else if (h != NULL 2429 && h->dynindx != -1 2430 && (r_type == R_X86_64_PC8 2431 || r_type == R_X86_64_PC16 2432 || r_type == R_X86_64_PC32 2433 || r_type == R_X86_64_PC64 2434 || !info->shared 2435 || !SYMBOLIC_BIND (info, h) 2436 || !h->def_regular)) 2437 { 2438 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); 2439 outrel.r_addend = rel->r_addend; 2440 } 2441 else 2442 { 2443 /* This symbol is local, or marked to become local. */ 2444 if (r_type == R_X86_64_64) 2445 { 2446 relocate = TRUE; 2447 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); 2448 outrel.r_addend = relocation + rel->r_addend; 2449 } 2450 else 2451 { 2452 long sindx; 2453 2454 if (bfd_is_abs_section (sec)) 2455 sindx = 0; 2456 else if (sec == NULL || sec->owner == NULL) 2457 { 2458 bfd_set_error (bfd_error_bad_value); 2459 return FALSE; 2460 } 2461 else 2462 { 2463 asection *osec; 2464 2465 /* We are turning this relocation into one 2466 against a section symbol. It would be 2467 proper to subtract the symbol's value, 2468 osec->vma, from the emitted reloc addend, 2469 but ld.so expects buggy relocs. */ 2470 osec = sec->output_section; 2471 sindx = elf_section_data (osec)->dynindx; 2472 if (sindx == 0) 2473 { 2474 asection *oi = htab->elf.text_index_section; 2475 sindx = elf_section_data (oi)->dynindx; 2476 } 2477 BFD_ASSERT (sindx != 0); 2478 } 2479 2480 outrel.r_info = ELF64_R_INFO (sindx, r_type); 2481 outrel.r_addend = relocation + rel->r_addend; 2482 } 2483 } 2484 2485 sreloc = elf_section_data (input_section)->sreloc; 2486 if (sreloc == NULL) 2487 abort (); 2488 2489 loc = sreloc->contents; 2490 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2491 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2492 2493 /* If this reloc is against an external symbol, we do 2494 not want to fiddle with the addend. Otherwise, we 2495 need to include the symbol value so that it becomes 2496 an addend for the dynamic reloc. */ 2497 if (! relocate) 2498 continue; 2499 } 2500 2501 break; 2502 2503 case R_X86_64_TLSGD: 2504 case R_X86_64_GOTPC32_TLSDESC: 2505 case R_X86_64_TLSDESC_CALL: 2506 case R_X86_64_GOTTPOFF: 2507 r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL); 2508 tls_type = GOT_UNKNOWN; 2509 if (h == NULL && local_got_offsets) 2510 tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx]; 2511 else if (h != NULL) 2512 { 2513 tls_type = elf64_x86_64_hash_entry (h)->tls_type; 2514 if (!info->shared && h->dynindx == -1 && tls_type == GOT_TLS_IE) 2515 r_type = R_X86_64_TPOFF32; 2516 } 2517 if (r_type == R_X86_64_TLSGD 2518 || r_type == R_X86_64_GOTPC32_TLSDESC 2519 || r_type == R_X86_64_TLSDESC_CALL) 2520 { 2521 if (tls_type == GOT_TLS_IE) 2522 r_type = R_X86_64_GOTTPOFF; 2523 } 2524 2525 if (r_type == R_X86_64_TPOFF32) 2526 { 2527 BFD_ASSERT (! unresolved_reloc); 2528 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD) 2529 { 2530 unsigned int i; 2531 static unsigned char tlsgd[8] 2532 = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 }; 2533 2534 /* GD->LE transition. 2535 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 2536 .word 0x6666; rex64; call __tls_get_addr@plt 2537 Change it into: 2538 movq %fs:0, %rax 2539 leaq foo@tpoff(%rax), %rax */ 2540 BFD_ASSERT (rel->r_offset >= 4); 2541 for (i = 0; i < 4; i++) 2542 BFD_ASSERT (bfd_get_8 (input_bfd, 2543 contents + rel->r_offset - 4 + i) 2544 == tlsgd[i]); 2545 BFD_ASSERT (rel->r_offset + 12 <= input_section->size); 2546 for (i = 0; i < 4; i++) 2547 BFD_ASSERT (bfd_get_8 (input_bfd, 2548 contents + rel->r_offset + 4 + i) 2549 == tlsgd[i+4]); 2550 BFD_ASSERT (rel + 1 < relend); 2551 BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); 2552 memcpy (contents + rel->r_offset - 4, 2553 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", 2554 16); 2555 bfd_put_32 (output_bfd, tpoff (info, relocation), 2556 contents + rel->r_offset + 8); 2557 /* Skip R_X86_64_PLT32. */ 2558 rel++; 2559 continue; 2560 } 2561 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) 2562 { 2563 /* GDesc -> LE transition. 2564 It's originally something like: 2565 leaq x@tlsdesc(%rip), %rax 2566 2567 Change it to: 2568 movl $x@tpoff, %rax 2569 2570 Registers other than %rax may be set up here. */ 2571 2572 unsigned int val, type, type2; 2573 bfd_vma roff; 2574 2575 /* First, make sure it's a leaq adding rip to a 2576 32-bit offset into any register, although it's 2577 probably almost always going to be rax. */ 2578 roff = rel->r_offset; 2579 BFD_ASSERT (roff >= 3); 2580 type = bfd_get_8 (input_bfd, contents + roff - 3); 2581 BFD_ASSERT ((type & 0xfb) == 0x48); 2582 type2 = bfd_get_8 (input_bfd, contents + roff - 2); 2583 BFD_ASSERT (type2 == 0x8d); 2584 val = bfd_get_8 (input_bfd, contents + roff - 1); 2585 BFD_ASSERT ((val & 0xc7) == 0x05); 2586 BFD_ASSERT (roff + 4 <= input_section->size); 2587 2588 /* Now modify the instruction as appropriate. */ 2589 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1), 2590 contents + roff - 3); 2591 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2); 2592 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 2593 contents + roff - 1); 2594 bfd_put_32 (output_bfd, tpoff (info, relocation), 2595 contents + roff); 2596 continue; 2597 } 2598 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) 2599 { 2600 /* GDesc -> LE transition. 2601 It's originally: 2602 call *(%rax) 2603 Turn it into: 2604 nop; nop. */ 2605 2606 unsigned int val, type; 2607 bfd_vma roff; 2608 2609 /* First, make sure it's a call *(%rax). */ 2610 roff = rel->r_offset; 2611 BFD_ASSERT (roff + 2 <= input_section->size); 2612 type = bfd_get_8 (input_bfd, contents + roff); 2613 BFD_ASSERT (type == 0xff); 2614 val = bfd_get_8 (input_bfd, contents + roff + 1); 2615 BFD_ASSERT (val == 0x10); 2616 2617 /* Now modify the instruction as appropriate. Use 2618 xchg %ax,%ax instead of 2 nops. */ 2619 bfd_put_8 (output_bfd, 0x66, contents + roff); 2620 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 2621 continue; 2622 } 2623 else 2624 { 2625 unsigned int val, type, reg; 2626 2627 /* IE->LE transition: 2628 Originally it can be one of: 2629 movq foo@gottpoff(%rip), %reg 2630 addq foo@gottpoff(%rip), %reg 2631 We change it into: 2632 movq $foo, %reg 2633 leaq foo(%reg), %reg 2634 addq $foo, %reg. */ 2635 BFD_ASSERT (rel->r_offset >= 3); 2636 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 3); 2637 BFD_ASSERT (val == 0x48 || val == 0x4c); 2638 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 2639 BFD_ASSERT (type == 0x8b || type == 0x03); 2640 reg = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2641 BFD_ASSERT ((reg & 0xc7) == 5); 2642 reg >>= 3; 2643 BFD_ASSERT (rel->r_offset + 4 <= input_section->size); 2644 if (type == 0x8b) 2645 { 2646 /* movq */ 2647 if (val == 0x4c) 2648 bfd_put_8 (output_bfd, 0x49, 2649 contents + rel->r_offset - 3); 2650 bfd_put_8 (output_bfd, 0xc7, 2651 contents + rel->r_offset - 2); 2652 bfd_put_8 (output_bfd, 0xc0 | reg, 2653 contents + rel->r_offset - 1); 2654 } 2655 else if (reg == 4) 2656 { 2657 /* addq -> addq - addressing with %rsp/%r12 is 2658 special */ 2659 if (val == 0x4c) 2660 bfd_put_8 (output_bfd, 0x49, 2661 contents + rel->r_offset - 3); 2662 bfd_put_8 (output_bfd, 0x81, 2663 contents + rel->r_offset - 2); 2664 bfd_put_8 (output_bfd, 0xc0 | reg, 2665 contents + rel->r_offset - 1); 2666 } 2667 else 2668 { 2669 /* addq -> leaq */ 2670 if (val == 0x4c) 2671 bfd_put_8 (output_bfd, 0x4d, 2672 contents + rel->r_offset - 3); 2673 bfd_put_8 (output_bfd, 0x8d, 2674 contents + rel->r_offset - 2); 2675 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), 2676 contents + rel->r_offset - 1); 2677 } 2678 bfd_put_32 (output_bfd, tpoff (info, relocation), 2679 contents + rel->r_offset); 2680 continue; 2681 } 2682 } 2683 2684 if (htab->sgot == NULL) 2685 abort (); 2686 2687 if (h != NULL) 2688 { 2689 off = h->got.offset; 2690 offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got; 2691 } 2692 else 2693 { 2694 if (local_got_offsets == NULL) 2695 abort (); 2696 2697 off = local_got_offsets[r_symndx]; 2698 offplt = local_tlsdesc_gotents[r_symndx]; 2699 } 2700 2701 if ((off & 1) != 0) 2702 off &= ~1; 2703 else 2704 { 2705 Elf_Internal_Rela outrel; 2706 bfd_byte *loc; 2707 int dr_type, indx; 2708 asection *sreloc; 2709 2710 if (htab->srelgot == NULL) 2711 abort (); 2712 2713 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2714 2715 if (GOT_TLS_GDESC_P (tls_type)) 2716 { 2717 outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC); 2718 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt 2719 + 2 * GOT_ENTRY_SIZE <= htab->sgotplt->size); 2720 outrel.r_offset = (htab->sgotplt->output_section->vma 2721 + htab->sgotplt->output_offset 2722 + offplt 2723 + htab->sgotplt_jump_table_size); 2724 sreloc = htab->srelplt; 2725 loc = sreloc->contents; 2726 loc += sreloc->reloc_count++ 2727 * sizeof (Elf64_External_Rela); 2728 BFD_ASSERT (loc + sizeof (Elf64_External_Rela) 2729 <= sreloc->contents + sreloc->size); 2730 if (indx == 0) 2731 outrel.r_addend = relocation - dtpoff_base (info); 2732 else 2733 outrel.r_addend = 0; 2734 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2735 } 2736 2737 sreloc = htab->srelgot; 2738 2739 outrel.r_offset = (htab->sgot->output_section->vma 2740 + htab->sgot->output_offset + off); 2741 2742 if (GOT_TLS_GD_P (tls_type)) 2743 dr_type = R_X86_64_DTPMOD64; 2744 else if (GOT_TLS_GDESC_P (tls_type)) 2745 goto dr_done; 2746 else 2747 dr_type = R_X86_64_TPOFF64; 2748 2749 bfd_put_64 (output_bfd, 0, htab->sgot->contents + off); 2750 outrel.r_addend = 0; 2751 if ((dr_type == R_X86_64_TPOFF64 2752 || dr_type == R_X86_64_TLSDESC) && indx == 0) 2753 outrel.r_addend = relocation - dtpoff_base (info); 2754 outrel.r_info = ELF64_R_INFO (indx, dr_type); 2755 2756 loc = sreloc->contents; 2757 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 2758 BFD_ASSERT (loc + sizeof (Elf64_External_Rela) 2759 <= sreloc->contents + sreloc->size); 2760 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2761 2762 if (GOT_TLS_GD_P (tls_type)) 2763 { 2764 if (indx == 0) 2765 { 2766 BFD_ASSERT (! unresolved_reloc); 2767 bfd_put_64 (output_bfd, 2768 relocation - dtpoff_base (info), 2769 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2770 } 2771 else 2772 { 2773 bfd_put_64 (output_bfd, 0, 2774 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2775 outrel.r_info = ELF64_R_INFO (indx, 2776 R_X86_64_DTPOFF64); 2777 outrel.r_offset += GOT_ENTRY_SIZE; 2778 sreloc->reloc_count++; 2779 loc += sizeof (Elf64_External_Rela); 2780 BFD_ASSERT (loc + sizeof (Elf64_External_Rela) 2781 <= sreloc->contents + sreloc->size); 2782 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2783 } 2784 } 2785 2786 dr_done: 2787 if (h != NULL) 2788 h->got.offset |= 1; 2789 else 2790 local_got_offsets[r_symndx] |= 1; 2791 } 2792 2793 if (off >= (bfd_vma) -2 2794 && ! GOT_TLS_GDESC_P (tls_type)) 2795 abort (); 2796 if (r_type == ELF64_R_TYPE (rel->r_info)) 2797 { 2798 if (r_type == R_X86_64_GOTPC32_TLSDESC 2799 || r_type == R_X86_64_TLSDESC_CALL) 2800 relocation = htab->sgotplt->output_section->vma 2801 + htab->sgotplt->output_offset 2802 + offplt + htab->sgotplt_jump_table_size; 2803 else 2804 relocation = htab->sgot->output_section->vma 2805 + htab->sgot->output_offset + off; 2806 unresolved_reloc = FALSE; 2807 } 2808 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD) 2809 { 2810 unsigned int i; 2811 static unsigned char tlsgd[8] 2812 = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 }; 2813 2814 /* GD->IE transition. 2815 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 2816 .word 0x6666; rex64; call __tls_get_addr@plt 2817 Change it into: 2818 movq %fs:0, %rax 2819 addq foo@gottpoff(%rip), %rax */ 2820 BFD_ASSERT (rel->r_offset >= 4); 2821 for (i = 0; i < 4; i++) 2822 BFD_ASSERT (bfd_get_8 (input_bfd, 2823 contents + rel->r_offset - 4 + i) 2824 == tlsgd[i]); 2825 BFD_ASSERT (rel->r_offset + 12 <= input_section->size); 2826 for (i = 0; i < 4; i++) 2827 BFD_ASSERT (bfd_get_8 (input_bfd, 2828 contents + rel->r_offset + 4 + i) 2829 == tlsgd[i+4]); 2830 BFD_ASSERT (rel + 1 < relend); 2831 BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); 2832 memcpy (contents + rel->r_offset - 4, 2833 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", 2834 16); 2835 2836 relocation = (htab->sgot->output_section->vma 2837 + htab->sgot->output_offset + off 2838 - rel->r_offset 2839 - input_section->output_section->vma 2840 - input_section->output_offset 2841 - 12); 2842 bfd_put_32 (output_bfd, relocation, 2843 contents + rel->r_offset + 8); 2844 /* Skip R_X86_64_PLT32. */ 2845 rel++; 2846 continue; 2847 } 2848 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) 2849 { 2850 /* GDesc -> IE transition. 2851 It's originally something like: 2852 leaq x@tlsdesc(%rip), %rax 2853 2854 Change it to: 2855 movq x@gottpoff(%rip), %rax # before nop; nop 2856 2857 Registers other than %rax may be set up here. */ 2858 2859 unsigned int val, type, type2; 2860 bfd_vma roff; 2861 2862 /* First, make sure it's a leaq adding rip to a 32-bit 2863 offset into any register, although it's probably 2864 almost always going to be rax. */ 2865 roff = rel->r_offset; 2866 BFD_ASSERT (roff >= 3); 2867 type = bfd_get_8 (input_bfd, contents + roff - 3); 2868 BFD_ASSERT ((type & 0xfb) == 0x48); 2869 type2 = bfd_get_8 (input_bfd, contents + roff - 2); 2870 BFD_ASSERT (type2 == 0x8d); 2871 val = bfd_get_8 (input_bfd, contents + roff - 1); 2872 BFD_ASSERT ((val & 0xc7) == 0x05); 2873 BFD_ASSERT (roff + 4 <= input_section->size); 2874 2875 /* Now modify the instruction as appropriate. */ 2876 /* To turn a leaq into a movq in the form we use it, it 2877 suffices to change the second byte from 0x8d to 2878 0x8b. */ 2879 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); 2880 2881 bfd_put_32 (output_bfd, 2882 htab->sgot->output_section->vma 2883 + htab->sgot->output_offset + off 2884 - rel->r_offset 2885 - input_section->output_section->vma 2886 - input_section->output_offset 2887 - 4, 2888 contents + roff); 2889 continue; 2890 } 2891 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) 2892 { 2893 /* GDesc -> IE transition. 2894 It's originally: 2895 call *(%rax) 2896 2897 Change it to: 2898 nop; nop. */ 2899 2900 unsigned int val, type; 2901 bfd_vma roff; 2902 2903 /* First, make sure it's a call *(%eax). */ 2904 roff = rel->r_offset; 2905 BFD_ASSERT (roff + 2 <= input_section->size); 2906 type = bfd_get_8 (input_bfd, contents + roff); 2907 BFD_ASSERT (type == 0xff); 2908 val = bfd_get_8 (input_bfd, contents + roff + 1); 2909 BFD_ASSERT (val == 0x10); 2910 2911 /* Now modify the instruction as appropriate. Use 2912 xchg %ax,%ax instead of 2 nops. */ 2913 bfd_put_8 (output_bfd, 0x66, contents + roff); 2914 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 2915 2916 continue; 2917 } 2918 else 2919 BFD_ASSERT (FALSE); 2920 break; 2921 2922 case R_X86_64_TLSLD: 2923 if (! info->shared) 2924 { 2925 /* LD->LE transition: 2926 Ensure it is: 2927 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr@plt. 2928 We change it into: 2929 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */ 2930 BFD_ASSERT (rel->r_offset >= 3); 2931 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 3) 2932 == 0x48); 2933 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2) 2934 == 0x8d); 2935 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 1) 2936 == 0x3d); 2937 BFD_ASSERT (rel->r_offset + 9 <= input_section->size); 2938 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) 2939 == 0xe8); 2940 BFD_ASSERT (rel + 1 < relend); 2941 BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); 2942 memcpy (contents + rel->r_offset - 3, 2943 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); 2944 /* Skip R_X86_64_PLT32. */ 2945 rel++; 2946 continue; 2947 } 2948 2949 if (htab->sgot == NULL) 2950 abort (); 2951 2952 off = htab->tls_ld_got.offset; 2953 if (off & 1) 2954 off &= ~1; 2955 else 2956 { 2957 Elf_Internal_Rela outrel; 2958 bfd_byte *loc; 2959 2960 if (htab->srelgot == NULL) 2961 abort (); 2962 2963 outrel.r_offset = (htab->sgot->output_section->vma 2964 + htab->sgot->output_offset + off); 2965 2966 bfd_put_64 (output_bfd, 0, 2967 htab->sgot->contents + off); 2968 bfd_put_64 (output_bfd, 0, 2969 htab->sgot->contents + off + GOT_ENTRY_SIZE); 2970 outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64); 2971 outrel.r_addend = 0; 2972 loc = htab->srelgot->contents; 2973 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); 2974 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 2975 htab->tls_ld_got.offset |= 1; 2976 } 2977 relocation = htab->sgot->output_section->vma 2978 + htab->sgot->output_offset + off; 2979 unresolved_reloc = FALSE; 2980 break; 2981 2982 case R_X86_64_DTPOFF32: 2983 if (info->shared || (input_section->flags & SEC_CODE) == 0) 2984 relocation -= dtpoff_base (info); 2985 else 2986 relocation = tpoff (info, relocation); 2987 break; 2988 2989 case R_X86_64_TPOFF32: 2990 BFD_ASSERT (! info->shared); 2991 relocation = tpoff (info, relocation); 2992 break; 2993 2994 default: 2995 break; 2996 } 2997 2998 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 2999 because such sections are not SEC_ALLOC and thus ld.so will 3000 not process them. */ 3001 if (unresolved_reloc 3002 && !((input_section->flags & SEC_DEBUGGING) != 0 3003 && h->def_dynamic)) 3004 (*_bfd_error_handler) 3005 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 3006 input_bfd, 3007 input_section, 3008 (long) rel->r_offset, 3009 howto->name, 3010 h->root.root.string); 3011 3012 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3013 contents, rel->r_offset, 3014 relocation, rel->r_addend); 3015 3016 if (r != bfd_reloc_ok) 3017 { 3018 const char *name; 3019 3020 if (h != NULL) 3021 name = h->root.root.string; 3022 else 3023 { 3024 name = bfd_elf_string_from_elf_section (input_bfd, 3025 symtab_hdr->sh_link, 3026 sym->st_name); 3027 if (name == NULL) 3028 return FALSE; 3029 if (*name == '\0') 3030 name = bfd_section_name (input_bfd, sec); 3031 } 3032 3033 if (r == bfd_reloc_overflow) 3034 { 3035 if (! ((*info->callbacks->reloc_overflow) 3036 (info, (h ? &h->root : NULL), name, howto->name, 3037 (bfd_vma) 0, input_bfd, input_section, 3038 rel->r_offset))) 3039 return FALSE; 3040 } 3041 else 3042 { 3043 (*_bfd_error_handler) 3044 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 3045 input_bfd, input_section, 3046 (long) rel->r_offset, name, (int) r); 3047 return FALSE; 3048 } 3049 } 3050 } 3051 3052 return TRUE; 3053} 3054 3055/* Finish up dynamic symbol handling. We set the contents of various 3056 dynamic sections here. */ 3057 3058static bfd_boolean 3059elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd, 3060 struct bfd_link_info *info, 3061 struct elf_link_hash_entry *h, 3062 Elf_Internal_Sym *sym) 3063{ 3064 struct elf64_x86_64_link_hash_table *htab; 3065 3066 htab = elf64_x86_64_hash_table (info); 3067 3068 if (h->plt.offset != (bfd_vma) -1) 3069 { 3070 bfd_vma plt_index; 3071 bfd_vma got_offset; 3072 Elf_Internal_Rela rela; 3073 bfd_byte *loc; 3074 3075 /* This symbol has an entry in the procedure linkage table. Set 3076 it up. */ 3077 if (h->dynindx == -1 3078 || htab->splt == NULL 3079 || htab->sgotplt == NULL 3080 || htab->srelplt == NULL) 3081 abort (); 3082 3083 /* Get the index in the procedure linkage table which 3084 corresponds to this symbol. This is the index of this symbol 3085 in all the symbols for which we are making plt entries. The 3086 first entry in the procedure linkage table is reserved. */ 3087 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 3088 3089 /* Get the offset into the .got table of the entry that 3090 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE 3091 bytes. The first three are reserved for the dynamic linker. */ 3092 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; 3093 3094 /* Fill in the entry in the procedure linkage table. */ 3095 memcpy (htab->splt->contents + h->plt.offset, elf64_x86_64_plt_entry, 3096 PLT_ENTRY_SIZE); 3097 3098 /* Insert the relocation positions of the plt section. The magic 3099 numbers at the end of the statements are the positions of the 3100 relocations in the plt section. */ 3101 /* Put offset for jmp *name@GOTPCREL(%rip), since the 3102 instruction uses 6 bytes, subtract this value. */ 3103 bfd_put_32 (output_bfd, 3104 (htab->sgotplt->output_section->vma 3105 + htab->sgotplt->output_offset 3106 + got_offset 3107 - htab->splt->output_section->vma 3108 - htab->splt->output_offset 3109 - h->plt.offset 3110 - 6), 3111 htab->splt->contents + h->plt.offset + 2); 3112 /* Put relocation index. */ 3113 bfd_put_32 (output_bfd, plt_index, 3114 htab->splt->contents + h->plt.offset + 7); 3115 /* Put offset for jmp .PLT0. */ 3116 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), 3117 htab->splt->contents + h->plt.offset + 12); 3118 3119 /* Fill in the entry in the global offset table, initially this 3120 points to the pushq instruction in the PLT which is at offset 6. */ 3121 bfd_put_64 (output_bfd, (htab->splt->output_section->vma 3122 + htab->splt->output_offset 3123 + h->plt.offset + 6), 3124 htab->sgotplt->contents + got_offset); 3125 3126 /* Fill in the entry in the .rela.plt section. */ 3127 rela.r_offset = (htab->sgotplt->output_section->vma 3128 + htab->sgotplt->output_offset 3129 + got_offset); 3130 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT); 3131 rela.r_addend = 0; 3132 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela); 3133 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3134 3135 if (!h->def_regular) 3136 { 3137 /* Mark the symbol as undefined, rather than as defined in 3138 the .plt section. Leave the value if there were any 3139 relocations where pointer equality matters (this is a clue 3140 for the dynamic linker, to make function pointer 3141 comparisons work between an application and shared 3142 library), otherwise set it to zero. If a function is only 3143 called from a binary, there is no need to slow down 3144 shared libraries because of that. */ 3145 sym->st_shndx = SHN_UNDEF; 3146 if (!h->pointer_equality_needed) 3147 sym->st_value = 0; 3148 } 3149 } 3150 3151 if (h->got.offset != (bfd_vma) -1 3152 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type) 3153 && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE) 3154 { 3155 Elf_Internal_Rela rela; 3156 bfd_byte *loc; 3157 3158 /* This symbol has an entry in the global offset table. Set it 3159 up. */ 3160 if (htab->sgot == NULL || htab->srelgot == NULL) 3161 abort (); 3162 3163 rela.r_offset = (htab->sgot->output_section->vma 3164 + htab->sgot->output_offset 3165 + (h->got.offset &~ (bfd_vma) 1)); 3166 3167 /* If this is a static link, or it is a -Bsymbolic link and the 3168 symbol is defined locally or was forced to be local because 3169 of a version file, we just want to emit a RELATIVE reloc. 3170 The entry in the global offset table will already have been 3171 initialized in the relocate_section function. */ 3172 if (info->shared 3173 && SYMBOL_REFERENCES_LOCAL (info, h)) 3174 { 3175 BFD_ASSERT((h->got.offset & 1) != 0); 3176 rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); 3177 rela.r_addend = (h->root.u.def.value 3178 + h->root.u.def.section->output_section->vma 3179 + h->root.u.def.section->output_offset); 3180 } 3181 else 3182 { 3183 BFD_ASSERT((h->got.offset & 1) == 0); 3184 bfd_put_64 (output_bfd, (bfd_vma) 0, 3185 htab->sgot->contents + h->got.offset); 3186 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT); 3187 rela.r_addend = 0; 3188 } 3189 3190 loc = htab->srelgot->contents; 3191 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); 3192 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3193 } 3194 3195 if (h->needs_copy) 3196 { 3197 Elf_Internal_Rela rela; 3198 bfd_byte *loc; 3199 3200 /* This symbol needs a copy reloc. Set it up. */ 3201 3202 if (h->dynindx == -1 3203 || (h->root.type != bfd_link_hash_defined 3204 && h->root.type != bfd_link_hash_defweak) 3205 || htab->srelbss == NULL) 3206 abort (); 3207 3208 rela.r_offset = (h->root.u.def.value 3209 + h->root.u.def.section->output_section->vma 3210 + h->root.u.def.section->output_offset); 3211 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY); 3212 rela.r_addend = 0; 3213 loc = htab->srelbss->contents; 3214 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela); 3215 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 3216 } 3217 3218 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 3219 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 3220 || h == htab->elf.hgot) 3221 sym->st_shndx = SHN_ABS; 3222 3223 return TRUE; 3224} 3225 3226/* Used to decide how to sort relocs in an optimal manner for the 3227 dynamic linker, before writing them out. */ 3228 3229static enum elf_reloc_type_class 3230elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela) 3231{ 3232 switch ((int) ELF64_R_TYPE (rela->r_info)) 3233 { 3234 case R_X86_64_RELATIVE: 3235 return reloc_class_relative; 3236 case R_X86_64_JUMP_SLOT: 3237 return reloc_class_plt; 3238 case R_X86_64_COPY: 3239 return reloc_class_copy; 3240 default: 3241 return reloc_class_normal; 3242 } 3243} 3244 3245/* Finish up the dynamic sections. */ 3246 3247static bfd_boolean 3248elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 3249{ 3250 struct elf64_x86_64_link_hash_table *htab; 3251 bfd *dynobj; 3252 asection *sdyn; 3253 3254 htab = elf64_x86_64_hash_table (info); 3255 dynobj = htab->elf.dynobj; 3256 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 3257 3258 if (htab->elf.dynamic_sections_created) 3259 { 3260 Elf64_External_Dyn *dyncon, *dynconend; 3261 3262 if (sdyn == NULL || htab->sgot == NULL) 3263 abort (); 3264 3265 dyncon = (Elf64_External_Dyn *) sdyn->contents; 3266 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); 3267 for (; dyncon < dynconend; dyncon++) 3268 { 3269 Elf_Internal_Dyn dyn; 3270 asection *s; 3271 3272 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); 3273 3274 switch (dyn.d_tag) 3275 { 3276 default: 3277 continue; 3278 3279 case DT_PLTGOT: 3280 s = htab->sgotplt; 3281 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3282 break; 3283 3284 case DT_JMPREL: 3285 dyn.d_un.d_ptr = htab->srelplt->output_section->vma; 3286 break; 3287 3288 case DT_PLTRELSZ: 3289 s = htab->srelplt->output_section; 3290 dyn.d_un.d_val = s->size; 3291 break; 3292 3293 case DT_RELASZ: 3294 /* The procedure linkage table relocs (DT_JMPREL) should 3295 not be included in the overall relocs (DT_RELA). 3296 Therefore, we override the DT_RELASZ entry here to 3297 make it not include the JMPREL relocs. Since the 3298 linker script arranges for .rela.plt to follow all 3299 other relocation sections, we don't have to worry 3300 about changing the DT_RELA entry. */ 3301 if (htab->srelplt != NULL) 3302 { 3303 s = htab->srelplt->output_section; 3304 dyn.d_un.d_val -= s->size; 3305 } 3306 break; 3307 3308 case DT_TLSDESC_PLT: 3309 s = htab->splt; 3310 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset 3311 + htab->tlsdesc_plt; 3312 break; 3313 3314 case DT_TLSDESC_GOT: 3315 s = htab->sgot; 3316 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset 3317 + htab->tlsdesc_got; 3318 break; 3319 } 3320 3321 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); 3322 } 3323 3324 /* Fill in the special first entry in the procedure linkage table. */ 3325 if (htab->splt && htab->splt->size > 0) 3326 { 3327 /* Fill in the first entry in the procedure linkage table. */ 3328 memcpy (htab->splt->contents, elf64_x86_64_plt0_entry, 3329 PLT_ENTRY_SIZE); 3330 /* Add offset for pushq GOT+8(%rip), since the instruction 3331 uses 6 bytes subtract this value. */ 3332 bfd_put_32 (output_bfd, 3333 (htab->sgotplt->output_section->vma 3334 + htab->sgotplt->output_offset 3335 + 8 3336 - htab->splt->output_section->vma 3337 - htab->splt->output_offset 3338 - 6), 3339 htab->splt->contents + 2); 3340 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to 3341 the end of the instruction. */ 3342 bfd_put_32 (output_bfd, 3343 (htab->sgotplt->output_section->vma 3344 + htab->sgotplt->output_offset 3345 + 16 3346 - htab->splt->output_section->vma 3347 - htab->splt->output_offset 3348 - 12), 3349 htab->splt->contents + 8); 3350 3351 elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize = 3352 PLT_ENTRY_SIZE; 3353 3354 if (htab->tlsdesc_plt) 3355 { 3356 bfd_put_64 (output_bfd, (bfd_vma) 0, 3357 htab->sgot->contents + htab->tlsdesc_got); 3358 3359 memcpy (htab->splt->contents + htab->tlsdesc_plt, 3360 elf64_x86_64_plt0_entry, 3361 PLT_ENTRY_SIZE); 3362 3363 /* Add offset for pushq GOT+8(%rip), since the 3364 instruction uses 6 bytes subtract this value. */ 3365 bfd_put_32 (output_bfd, 3366 (htab->sgotplt->output_section->vma 3367 + htab->sgotplt->output_offset 3368 + 8 3369 - htab->splt->output_section->vma 3370 - htab->splt->output_offset 3371 - htab->tlsdesc_plt 3372 - 6), 3373 htab->splt->contents + htab->tlsdesc_plt + 2); 3374 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for 3375 htab->tlsdesc_got. The 12 is the offset to the end of 3376 the instruction. */ 3377 bfd_put_32 (output_bfd, 3378 (htab->sgot->output_section->vma 3379 + htab->sgot->output_offset 3380 + htab->tlsdesc_got 3381 - htab->splt->output_section->vma 3382 - htab->splt->output_offset 3383 - htab->tlsdesc_plt 3384 - 12), 3385 htab->splt->contents + htab->tlsdesc_plt + 8); 3386 } 3387 } 3388 } 3389 3390 if (htab->sgotplt) 3391 { 3392 /* Fill in the first three entries in the global offset table. */ 3393 if (htab->sgotplt->size > 0) 3394 { 3395 /* Set the first entry in the global offset table to the address of 3396 the dynamic section. */ 3397 if (sdyn == NULL) 3398 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents); 3399 else 3400 bfd_put_64 (output_bfd, 3401 sdyn->output_section->vma + sdyn->output_offset, 3402 htab->sgotplt->contents); 3403 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ 3404 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE); 3405 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2); 3406 } 3407 3408 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 3409 GOT_ENTRY_SIZE; 3410 } 3411 3412 if (htab->sgot && htab->sgot->size > 0) 3413 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize 3414 = GOT_ENTRY_SIZE; 3415 3416 return TRUE; 3417} 3418 3419/* Return address for Ith PLT stub in section PLT, for relocation REL 3420 or (bfd_vma) -1 if it should not be included. */ 3421 3422static bfd_vma 3423elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt, 3424 const arelent *rel ATTRIBUTE_UNUSED) 3425{ 3426 return plt->vma + (i + 1) * PLT_ENTRY_SIZE; 3427} 3428 3429/* Handle an x86-64 specific section when reading an object file. This 3430 is called when elfcode.h finds a section with an unknown type. */ 3431 3432static bfd_boolean 3433elf64_x86_64_section_from_shdr (bfd *abfd, 3434 Elf_Internal_Shdr *hdr, 3435 const char *name, 3436 int shindex) 3437{ 3438 if (hdr->sh_type != SHT_X86_64_UNWIND) 3439 return FALSE; 3440 3441 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) 3442 return FALSE; 3443 3444 return TRUE; 3445} 3446 3447/* Hook called by the linker routine which adds symbols from an object 3448 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead 3449 of .bss. */ 3450 3451static bfd_boolean 3452elf64_x86_64_add_symbol_hook (bfd *abfd, 3453 struct bfd_link_info *info ATTRIBUTE_UNUSED, 3454 Elf_Internal_Sym *sym, 3455 const char **namep ATTRIBUTE_UNUSED, 3456 flagword *flagsp ATTRIBUTE_UNUSED, 3457 asection **secp, bfd_vma *valp) 3458{ 3459 asection *lcomm; 3460 3461 switch (sym->st_shndx) 3462 { 3463 case SHN_X86_64_LCOMMON: 3464 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON"); 3465 if (lcomm == NULL) 3466 { 3467 lcomm = bfd_make_section_with_flags (abfd, 3468 "LARGE_COMMON", 3469 (SEC_ALLOC 3470 | SEC_IS_COMMON 3471 | SEC_LINKER_CREATED)); 3472 if (lcomm == NULL) 3473 return FALSE; 3474 elf_section_flags (lcomm) |= SHF_X86_64_LARGE; 3475 } 3476 *secp = lcomm; 3477 *valp = sym->st_size; 3478 break; 3479 } 3480 return TRUE; 3481} 3482 3483 3484/* Given a BFD section, try to locate the corresponding ELF section 3485 index. */ 3486 3487static bfd_boolean 3488elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, 3489 asection *sec, int *index) 3490{ 3491 if (sec == &_bfd_elf_large_com_section) 3492 { 3493 *index = SHN_X86_64_LCOMMON; 3494 return TRUE; 3495 } 3496 return FALSE; 3497} 3498 3499/* Process a symbol. */ 3500 3501static void 3502elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, 3503 asymbol *asym) 3504{ 3505 elf_symbol_type *elfsym = (elf_symbol_type *) asym; 3506 3507 switch (elfsym->internal_elf_sym.st_shndx) 3508 { 3509 case SHN_X86_64_LCOMMON: 3510 asym->section = &_bfd_elf_large_com_section; 3511 asym->value = elfsym->internal_elf_sym.st_size; 3512 /* Common symbol doesn't set BSF_GLOBAL. */ 3513 asym->flags &= ~BSF_GLOBAL; 3514 break; 3515 } 3516} 3517 3518static bfd_boolean 3519elf64_x86_64_common_definition (Elf_Internal_Sym *sym) 3520{ 3521 return (sym->st_shndx == SHN_COMMON 3522 || sym->st_shndx == SHN_X86_64_LCOMMON); 3523} 3524 3525static unsigned int 3526elf64_x86_64_common_section_index (asection *sec) 3527{ 3528 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) 3529 return SHN_COMMON; 3530 else 3531 return SHN_X86_64_LCOMMON; 3532} 3533 3534static asection * 3535elf64_x86_64_common_section (asection *sec) 3536{ 3537 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) 3538 return bfd_com_section_ptr; 3539 else 3540 return &_bfd_elf_large_com_section; 3541} 3542 3543static bfd_boolean 3544elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED, 3545 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED, 3546 struct elf_link_hash_entry *h, 3547 Elf_Internal_Sym *sym, 3548 asection **psec, 3549 bfd_vma *pvalue ATTRIBUTE_UNUSED, 3550 unsigned int *pold_alignment ATTRIBUTE_UNUSED, 3551 bfd_boolean *skip ATTRIBUTE_UNUSED, 3552 bfd_boolean *override ATTRIBUTE_UNUSED, 3553 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED, 3554 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED, 3555 bfd_boolean *newdef ATTRIBUTE_UNUSED, 3556 bfd_boolean *newdyn, 3557 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED, 3558 bfd_boolean *newweak ATTRIBUTE_UNUSED, 3559 bfd *abfd ATTRIBUTE_UNUSED, 3560 asection **sec, 3561 bfd_boolean *olddef ATTRIBUTE_UNUSED, 3562 bfd_boolean *olddyn, 3563 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED, 3564 bfd_boolean *oldweak ATTRIBUTE_UNUSED, 3565 bfd *oldbfd, 3566 asection **oldsec) 3567{ 3568 /* A normal common symbol and a large common symbol result in a 3569 normal common symbol. We turn the large common symbol into a 3570 normal one. */ 3571 if (!*olddyn 3572 && h->root.type == bfd_link_hash_common 3573 && !*newdyn 3574 && bfd_is_com_section (*sec) 3575 && *oldsec != *sec) 3576 { 3577 if (sym->st_shndx == SHN_COMMON 3578 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0) 3579 { 3580 h->root.u.c.p->section 3581 = bfd_make_section_old_way (oldbfd, "COMMON"); 3582 h->root.u.c.p->section->flags = SEC_ALLOC; 3583 } 3584 else if (sym->st_shndx == SHN_X86_64_LCOMMON 3585 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0) 3586 *psec = *sec = bfd_com_section_ptr; 3587 } 3588 3589 return TRUE; 3590} 3591 3592static int 3593elf64_x86_64_additional_program_headers (bfd *abfd, 3594 struct bfd_link_info *info ATTRIBUTE_UNUSED) 3595{ 3596 asection *s; 3597 int count = 0; 3598 3599 /* Check to see if we need a large readonly segment. */ 3600 s = bfd_get_section_by_name (abfd, ".lrodata"); 3601 if (s && (s->flags & SEC_LOAD)) 3602 count++; 3603 3604 /* Check to see if we need a large data segment. Since .lbss sections 3605 is placed right after the .bss section, there should be no need for 3606 a large data segment just because of .lbss. */ 3607 s = bfd_get_section_by_name (abfd, ".ldata"); 3608 if (s && (s->flags & SEC_LOAD)) 3609 count++; 3610 3611 return count; 3612} 3613 3614/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 3615 3616static bfd_boolean 3617elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h) 3618{ 3619 if (h->plt.offset != (bfd_vma) -1 3620 && !h->def_regular 3621 && !h->pointer_equality_needed) 3622 return FALSE; 3623 3624 return _bfd_elf_hash_symbol (h); 3625} 3626 3627static const struct bfd_elf_special_section 3628 elf64_x86_64_special_sections[]= 3629{ 3630 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, 3631 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, 3632 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE}, 3633 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, 3634 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, 3635 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, 3636 { NULL, 0, 0, 0, 0 } 3637}; 3638 3639#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec 3640#define TARGET_LITTLE_NAME "elf64-x86-64" 3641#define ELF_ARCH bfd_arch_i386 3642#define ELF_MACHINE_CODE EM_X86_64 3643#define ELF_MAXPAGESIZE 0x200000 3644#define ELF_MINPAGESIZE 0x1000 3645#define ELF_COMMONPAGESIZE 0x1000 3646 3647#define elf_backend_can_gc_sections 1 3648#define elf_backend_can_refcount 1 3649#define elf_backend_want_got_plt 1 3650#define elf_backend_plt_readonly 1 3651#define elf_backend_want_plt_sym 0 3652#define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) 3653#define elf_backend_rela_normal 1 3654 3655#define elf_info_to_howto elf64_x86_64_info_to_howto 3656 3657#define bfd_elf64_bfd_link_hash_table_create \ 3658 elf64_x86_64_link_hash_table_create 3659#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup 3660 3661#define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol 3662#define elf_backend_check_relocs elf64_x86_64_check_relocs 3663#define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol 3664#define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections 3665#define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections 3666#define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol 3667#define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook 3668#define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook 3669#define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus 3670#define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo 3671#define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class 3672#define elf_backend_relocate_section elf64_x86_64_relocate_section 3673#define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections 3674#define elf_backend_always_size_sections elf64_x86_64_always_size_sections 3675#define elf_backend_init_index_section _bfd_elf_init_1_index_section 3676#define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val 3677#define elf_backend_object_p elf64_x86_64_elf_object_p 3678#define bfd_elf64_mkobject elf64_x86_64_mkobject 3679 3680#define elf_backend_section_from_shdr \ 3681 elf64_x86_64_section_from_shdr 3682 3683#define elf_backend_section_from_bfd_section \ 3684 elf64_x86_64_elf_section_from_bfd_section 3685#define elf_backend_add_symbol_hook \ 3686 elf64_x86_64_add_symbol_hook 3687#define elf_backend_symbol_processing \ 3688 elf64_x86_64_symbol_processing 3689#define elf_backend_common_section_index \ 3690 elf64_x86_64_common_section_index 3691#define elf_backend_common_section \ 3692 elf64_x86_64_common_section 3693#define elf_backend_common_definition \ 3694 elf64_x86_64_common_definition 3695#define elf_backend_merge_symbol \ 3696 elf64_x86_64_merge_symbol 3697#define elf_backend_special_sections \ 3698 elf64_x86_64_special_sections 3699#define elf_backend_additional_program_headers \ 3700 elf64_x86_64_additional_program_headers 3701#define elf_backend_hash_symbol \ 3702 elf64_x86_64_hash_symbol 3703 3704#include "elf64-target.h" 3705 3706/* FreeBSD support. */ 3707 3708#undef TARGET_LITTLE_SYM 3709#define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec 3710#undef TARGET_LITTLE_NAME 3711#define TARGET_LITTLE_NAME "elf64-x86-64-freebsd" 3712 3713/* The kernel recognizes executables as valid only if they carry a 3714 "FreeBSD" label in the ELF header. So we put this label on all 3715 executables and (for simplicity) also all other object files. */ 3716 3717static void 3718elf64_x86_64_fbsd_post_process_headers (bfd * abfd, 3719 struct bfd_link_info * link_info ATTRIBUTE_UNUSED) 3720{ 3721 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */ 3722 3723 i_ehdrp = elf_elfheader (abfd); 3724 3725 /* Put an ABI label supported by FreeBSD >= 4.1. */ 3726 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 3727} 3728 3729#undef elf_backend_post_process_headers 3730#define elf_backend_post_process_headers elf64_x86_64_fbsd_post_process_headers 3731 3732#undef elf64_bed 3733#define elf64_bed elf64_x86_64_fbsd_bed 3734 3735#include "elf64-target.h" 3736