1/* X86-64 specific support for ELF 2 Copyright (C) 2000-2022 Free Software Foundation, Inc. 3 Contributed by Jan Hubicka <jh@suse.cz>. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22#include "elfxx-x86.h" 23#include "dwarf2.h" 24#include "libiberty.h" 25 26#include "opcode/i386.h" 27 28#ifdef CORE_HEADER 29#include <stdarg.h> 30#include CORE_HEADER 31#endif 32 33/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ 34#define MINUS_ONE (~ (bfd_vma) 0) 35 36/* Since both 32-bit and 64-bit x86-64 encode relocation type in the 37 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get 38 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE 39 since they are the same. */ 40 41/* The relocation "howto" table. Order of fields: 42 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow, 43 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */ 44static reloc_howto_type x86_64_elf_howto_table[] = 45{ 46 HOWTO(R_X86_64_NONE, 0, 0, 0, false, 0, complain_overflow_dont, 47 bfd_elf_generic_reloc, "R_X86_64_NONE", false, 0, 0x00000000, 48 false), 49 HOWTO(R_X86_64_64, 0, 8, 64, false, 0, complain_overflow_dont, 50 bfd_elf_generic_reloc, "R_X86_64_64", false, 0, MINUS_ONE, 51 false), 52 HOWTO(R_X86_64_PC32, 0, 4, 32, true, 0, complain_overflow_signed, 53 bfd_elf_generic_reloc, "R_X86_64_PC32", false, 0, 0xffffffff, 54 true), 55 HOWTO(R_X86_64_GOT32, 0, 4, 32, false, 0, complain_overflow_signed, 56 bfd_elf_generic_reloc, "R_X86_64_GOT32", false, 0, 0xffffffff, 57 false), 58 HOWTO(R_X86_64_PLT32, 0, 4, 32, true, 0, complain_overflow_signed, 59 bfd_elf_generic_reloc, "R_X86_64_PLT32", false, 0, 0xffffffff, 60 true), 61 HOWTO(R_X86_64_COPY, 0, 4, 32, false, 0, complain_overflow_bitfield, 62 bfd_elf_generic_reloc, "R_X86_64_COPY", false, 0, 0xffffffff, 63 false), 64 HOWTO(R_X86_64_GLOB_DAT, 0, 8, 64, false, 0, complain_overflow_dont, 65 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", false, 0, MINUS_ONE, 66 false), 67 HOWTO(R_X86_64_JUMP_SLOT, 0, 8, 64, false, 0, complain_overflow_dont, 68 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", false, 0, MINUS_ONE, 69 false), 70 HOWTO(R_X86_64_RELATIVE, 0, 8, 64, false, 0, complain_overflow_dont, 71 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", false, 0, MINUS_ONE, 72 false), 73 HOWTO(R_X86_64_GOTPCREL, 0, 4, 32, true, 0, complain_overflow_signed, 74 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", false, 0, 0xffffffff, 75 true), 76 HOWTO(R_X86_64_32, 0, 4, 32, false, 0, complain_overflow_unsigned, 77 bfd_elf_generic_reloc, "R_X86_64_32", false, 0, 0xffffffff, 78 false), 79 HOWTO(R_X86_64_32S, 0, 4, 32, false, 0, complain_overflow_signed, 80 bfd_elf_generic_reloc, "R_X86_64_32S", false, 0, 0xffffffff, 81 false), 82 HOWTO(R_X86_64_16, 0, 2, 16, false, 0, complain_overflow_bitfield, 83 bfd_elf_generic_reloc, "R_X86_64_16", false, 0, 0xffff, false), 84 HOWTO(R_X86_64_PC16, 0, 2, 16, true, 0, complain_overflow_bitfield, 85 bfd_elf_generic_reloc, "R_X86_64_PC16", false, 0, 0xffff, true), 86 HOWTO(R_X86_64_8, 0, 1, 8, false, 0, complain_overflow_bitfield, 87 bfd_elf_generic_reloc, "R_X86_64_8", false, 0, 0xff, false), 88 HOWTO(R_X86_64_PC8, 0, 1, 8, true, 0, complain_overflow_signed, 89 bfd_elf_generic_reloc, "R_X86_64_PC8", false, 0, 0xff, true), 90 HOWTO(R_X86_64_DTPMOD64, 0, 8, 64, false, 0, complain_overflow_dont, 91 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", false, 0, MINUS_ONE, 92 false), 93 HOWTO(R_X86_64_DTPOFF64, 0, 8, 64, false, 0, complain_overflow_dont, 94 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", false, 0, MINUS_ONE, 95 false), 96 HOWTO(R_X86_64_TPOFF64, 0, 8, 64, false, 0, complain_overflow_dont, 97 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", false, 0, MINUS_ONE, 98 false), 99 HOWTO(R_X86_64_TLSGD, 0, 4, 32, true, 0, complain_overflow_signed, 100 bfd_elf_generic_reloc, "R_X86_64_TLSGD", false, 0, 0xffffffff, 101 true), 102 HOWTO(R_X86_64_TLSLD, 0, 4, 32, true, 0, complain_overflow_signed, 103 bfd_elf_generic_reloc, "R_X86_64_TLSLD", false, 0, 0xffffffff, 104 true), 105 HOWTO(R_X86_64_DTPOFF32, 0, 4, 32, false, 0, complain_overflow_signed, 106 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", false, 0, 0xffffffff, 107 false), 108 HOWTO(R_X86_64_GOTTPOFF, 0, 4, 32, true, 0, complain_overflow_signed, 109 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", false, 0, 0xffffffff, 110 true), 111 HOWTO(R_X86_64_TPOFF32, 0, 4, 32, false, 0, complain_overflow_signed, 112 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", false, 0, 0xffffffff, 113 false), 114 HOWTO(R_X86_64_PC64, 0, 8, 64, true, 0, complain_overflow_dont, 115 bfd_elf_generic_reloc, "R_X86_64_PC64", false, 0, MINUS_ONE, 116 true), 117 HOWTO(R_X86_64_GOTOFF64, 0, 8, 64, false, 0, complain_overflow_dont, 118 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64", false, 0, MINUS_ONE, 119 false), 120 HOWTO(R_X86_64_GOTPC32, 0, 4, 32, true, 0, complain_overflow_signed, 121 bfd_elf_generic_reloc, "R_X86_64_GOTPC32", false, 0, 0xffffffff, 122 true), 123 HOWTO(R_X86_64_GOT64, 0, 8, 64, false, 0, complain_overflow_signed, 124 bfd_elf_generic_reloc, "R_X86_64_GOT64", false, 0, MINUS_ONE, 125 false), 126 HOWTO(R_X86_64_GOTPCREL64, 0, 8, 64, true, 0, complain_overflow_signed, 127 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", false, 0, MINUS_ONE, 128 true), 129 HOWTO(R_X86_64_GOTPC64, 0, 8, 64, true, 0, complain_overflow_signed, 130 bfd_elf_generic_reloc, "R_X86_64_GOTPC64", false, 0, MINUS_ONE, 131 true), 132 HOWTO(R_X86_64_GOTPLT64, 0, 8, 64, false, 0, complain_overflow_signed, 133 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", false, 0, MINUS_ONE, 134 false), 135 HOWTO(R_X86_64_PLTOFF64, 0, 8, 64, false, 0, complain_overflow_signed, 136 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", false, 0, MINUS_ONE, 137 false), 138 HOWTO(R_X86_64_SIZE32, 0, 4, 32, false, 0, complain_overflow_unsigned, 139 bfd_elf_generic_reloc, "R_X86_64_SIZE32", false, 0, 0xffffffff, 140 false), 141 HOWTO(R_X86_64_SIZE64, 0, 8, 64, false, 0, complain_overflow_dont, 142 bfd_elf_generic_reloc, "R_X86_64_SIZE64", false, 0, MINUS_ONE, 143 false), 144 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 4, 32, true, 0, 145 complain_overflow_bitfield, bfd_elf_generic_reloc, 146 "R_X86_64_GOTPC32_TLSDESC", false, 0, 0xffffffff, true), 147 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, false, 0, 148 complain_overflow_dont, bfd_elf_generic_reloc, 149 "R_X86_64_TLSDESC_CALL", 150 false, 0, 0, false), 151 HOWTO(R_X86_64_TLSDESC, 0, 8, 64, false, 0, 152 complain_overflow_dont, bfd_elf_generic_reloc, 153 "R_X86_64_TLSDESC", false, 0, MINUS_ONE, false), 154 HOWTO(R_X86_64_IRELATIVE, 0, 8, 64, false, 0, complain_overflow_dont, 155 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", false, 0, MINUS_ONE, 156 false), 157 HOWTO(R_X86_64_RELATIVE64, 0, 8, 64, false, 0, complain_overflow_dont, 158 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", false, 0, MINUS_ONE, 159 false), 160 HOWTO(R_X86_64_PC32_BND, 0, 4, 32, true, 0, complain_overflow_signed, 161 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", false, 0, 0xffffffff, 162 true), 163 HOWTO(R_X86_64_PLT32_BND, 0, 4, 32, true, 0, complain_overflow_signed, 164 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", false, 0, 0xffffffff, 165 true), 166 HOWTO(R_X86_64_GOTPCRELX, 0, 4, 32, true, 0, complain_overflow_signed, 167 bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", false, 0, 0xffffffff, 168 true), 169 HOWTO(R_X86_64_REX_GOTPCRELX, 0, 4, 32, true, 0, complain_overflow_signed, 170 bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", false, 0, 0xffffffff, 171 true), 172 173 /* We have a gap in the reloc numbers here. 174 R_X86_64_standard counts the number up to this point, and 175 R_X86_64_vt_offset is the value to subtract from a reloc type of 176 R_X86_64_GNU_VT* to form an index into this table. */ 177#define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1) 178#define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard) 179 180/* GNU extension to record C++ vtable hierarchy. */ 181 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 8, 0, false, 0, complain_overflow_dont, 182 NULL, "R_X86_64_GNU_VTINHERIT", false, 0, 0, false), 183 184/* GNU extension to record C++ vtable member usage. */ 185 HOWTO (R_X86_64_GNU_VTENTRY, 0, 8, 0, false, 0, complain_overflow_dont, 186 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", false, 0, 0, 187 false), 188 189/* Use complain_overflow_bitfield on R_X86_64_32 for x32. */ 190 HOWTO(R_X86_64_32, 0, 4, 32, false, 0, complain_overflow_bitfield, 191 bfd_elf_generic_reloc, "R_X86_64_32", false, 0, 0xffffffff, 192 false) 193}; 194 195/* Map BFD relocs to the x86_64 elf relocs. */ 196struct elf_reloc_map 197{ 198 bfd_reloc_code_real_type bfd_reloc_val; 199 unsigned char elf_reloc_val; 200}; 201 202static const struct elf_reloc_map x86_64_reloc_map[] = 203{ 204 { BFD_RELOC_NONE, R_X86_64_NONE, }, 205 { BFD_RELOC_64, R_X86_64_64, }, 206 { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, 207 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, 208 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, 209 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, 210 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, 211 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, 212 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, 213 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, 214 { BFD_RELOC_32, R_X86_64_32, }, 215 { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, 216 { BFD_RELOC_16, R_X86_64_16, }, 217 { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, 218 { BFD_RELOC_8, R_X86_64_8, }, 219 { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, 220 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, 221 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, 222 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, 223 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, 224 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, 225 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, 226 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, 227 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, 228 { BFD_RELOC_64_PCREL, R_X86_64_PC64, }, 229 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, }, 230 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, }, 231 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, }, 232 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, }, 233 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, }, 234 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, }, 235 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, }, 236 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, }, 237 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, }, 238 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, }, 239 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, }, 240 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, }, 241 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, }, 242 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, }, 243 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, }, 244 { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, }, 245 { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, }, 246 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, 247 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, 248}; 249 250static reloc_howto_type * 251elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type) 252{ 253 unsigned i; 254 255 if (r_type == (unsigned int) R_X86_64_32) 256 { 257 if (ABI_64_P (abfd)) 258 i = r_type; 259 else 260 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1; 261 } 262 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT 263 || r_type >= (unsigned int) R_X86_64_max) 264 { 265 if (r_type >= (unsigned int) R_X86_64_standard) 266 { 267 /* xgettext:c-format */ 268 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 269 abfd, r_type); 270 bfd_set_error (bfd_error_bad_value); 271 return NULL; 272 } 273 i = r_type; 274 } 275 else 276 i = r_type - (unsigned int) R_X86_64_vt_offset; 277 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type); 278 return &x86_64_elf_howto_table[i]; 279} 280 281/* Given a BFD reloc type, return a HOWTO structure. */ 282static reloc_howto_type * 283elf_x86_64_reloc_type_lookup (bfd *abfd, 284 bfd_reloc_code_real_type code) 285{ 286 unsigned int i; 287 288 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); 289 i++) 290 { 291 if (x86_64_reloc_map[i].bfd_reloc_val == code) 292 return elf_x86_64_rtype_to_howto (abfd, 293 x86_64_reloc_map[i].elf_reloc_val); 294 } 295 return NULL; 296} 297 298static reloc_howto_type * 299elf_x86_64_reloc_name_lookup (bfd *abfd, 300 const char *r_name) 301{ 302 unsigned int i; 303 304 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0) 305 { 306 /* Get x32 R_X86_64_32. */ 307 reloc_howto_type *reloc 308 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1]; 309 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32); 310 return reloc; 311 } 312 313 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++) 314 if (x86_64_elf_howto_table[i].name != NULL 315 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0) 316 return &x86_64_elf_howto_table[i]; 317 318 return NULL; 319} 320 321/* Given an x86_64 ELF reloc type, fill in an arelent structure. */ 322 323static bool 324elf_x86_64_info_to_howto (bfd *abfd, arelent *cache_ptr, 325 Elf_Internal_Rela *dst) 326{ 327 unsigned r_type; 328 329 r_type = ELF32_R_TYPE (dst->r_info); 330 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type); 331 if (cache_ptr->howto == NULL) 332 return false; 333 BFD_ASSERT (r_type == cache_ptr->howto->type || cache_ptr->howto->type == R_X86_64_NONE); 334 return true; 335} 336 337/* Support for core dump NOTE sections. */ 338static bool 339elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 340{ 341 int offset; 342 size_t size; 343 344 switch (note->descsz) 345 { 346 default: 347 return false; 348 349 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */ 350 /* pr_cursig */ 351 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 352 353 /* pr_pid */ 354 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 355 356 /* pr_reg */ 357 offset = 72; 358 size = 216; 359 360 break; 361 362 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ 363 /* pr_cursig */ 364 elf_tdata (abfd)->core->signal 365 = bfd_get_16 (abfd, note->descdata + 12); 366 367 /* pr_pid */ 368 elf_tdata (abfd)->core->lwpid 369 = bfd_get_32 (abfd, note->descdata + 32); 370 371 /* pr_reg */ 372 offset = 112; 373 size = 216; 374 375 break; 376 } 377 378 /* Make a ".reg/999" section. */ 379 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 380 size, note->descpos + offset); 381} 382 383static bool 384elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 385{ 386 switch (note->descsz) 387 { 388 default: 389 return false; 390 391 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */ 392 elf_tdata (abfd)->core->pid 393 = bfd_get_32 (abfd, note->descdata + 12); 394 elf_tdata (abfd)->core->program 395 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 396 elf_tdata (abfd)->core->command 397 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 398 break; 399 400 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ 401 elf_tdata (abfd)->core->pid 402 = bfd_get_32 (abfd, note->descdata + 24); 403 elf_tdata (abfd)->core->program 404 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); 405 elf_tdata (abfd)->core->command 406 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); 407 } 408 409 /* Note that for some reason, a spurious space is tacked 410 onto the end of the args in some (at least one anyway) 411 implementations, so strip it off if it exists. */ 412 413 { 414 char *command = elf_tdata (abfd)->core->command; 415 int n = strlen (command); 416 417 if (0 < n && command[n - 1] == ' ') 418 command[n - 1] = '\0'; 419 } 420 421 return true; 422} 423 424#ifdef CORE_HEADER 425# if GCC_VERSION >= 8000 426# pragma GCC diagnostic push 427# pragma GCC diagnostic ignored "-Wstringop-truncation" 428# endif 429static char * 430elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz, 431 int note_type, ...) 432{ 433 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 434 va_list ap; 435 const char *fname, *psargs; 436 long pid; 437 int cursig; 438 const void *gregs; 439 440 switch (note_type) 441 { 442 default: 443 return NULL; 444 445 case NT_PRPSINFO: 446 va_start (ap, note_type); 447 fname = va_arg (ap, const char *); 448 psargs = va_arg (ap, const char *); 449 va_end (ap); 450 451 if (bed->s->elfclass == ELFCLASS32) 452 { 453 prpsinfo32_t data; 454 memset (&data, 0, sizeof (data)); 455 strncpy (data.pr_fname, fname, sizeof (data.pr_fname)); 456 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs)); 457 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 458 &data, sizeof (data)); 459 } 460 else 461 { 462 prpsinfo64_t data; 463 memset (&data, 0, sizeof (data)); 464 strncpy (data.pr_fname, fname, sizeof (data.pr_fname)); 465 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs)); 466 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 467 &data, sizeof (data)); 468 } 469 /* NOTREACHED */ 470 471 case NT_PRSTATUS: 472 va_start (ap, note_type); 473 pid = va_arg (ap, long); 474 cursig = va_arg (ap, int); 475 gregs = va_arg (ap, const void *); 476 va_end (ap); 477 478 if (bed->s->elfclass == ELFCLASS32) 479 { 480 if (bed->elf_machine_code == EM_X86_64) 481 { 482 prstatusx32_t prstat; 483 memset (&prstat, 0, sizeof (prstat)); 484 prstat.pr_pid = pid; 485 prstat.pr_cursig = cursig; 486 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); 487 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 488 &prstat, sizeof (prstat)); 489 } 490 else 491 { 492 prstatus32_t prstat; 493 memset (&prstat, 0, sizeof (prstat)); 494 prstat.pr_pid = pid; 495 prstat.pr_cursig = cursig; 496 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); 497 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 498 &prstat, sizeof (prstat)); 499 } 500 } 501 else 502 { 503 prstatus64_t prstat; 504 memset (&prstat, 0, sizeof (prstat)); 505 prstat.pr_pid = pid; 506 prstat.pr_cursig = cursig; 507 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); 508 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 509 &prstat, sizeof (prstat)); 510 } 511 } 512 /* NOTREACHED */ 513} 514# if GCC_VERSION >= 8000 515# pragma GCC diagnostic pop 516# endif 517#endif 518 519/* Functions for the x86-64 ELF linker. */ 520 521/* The size in bytes of an entry in the global offset table. */ 522 523#define GOT_ENTRY_SIZE 8 524 525/* The size in bytes of an entry in the lazy procedure linkage table. */ 526 527#define LAZY_PLT_ENTRY_SIZE 16 528 529/* The size in bytes of an entry in the non-lazy procedure linkage 530 table. */ 531 532#define NON_LAZY_PLT_ENTRY_SIZE 8 533 534/* The first entry in a lazy procedure linkage table looks like this. 535 See the SVR4 ABI i386 supplement and the x86-64 ABI to see how this 536 works. */ 537 538static const bfd_byte elf_x86_64_lazy_plt0_entry[LAZY_PLT_ENTRY_SIZE] = 539{ 540 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ 541 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ 542 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ 543}; 544 545/* Subsequent entries in a lazy procedure linkage table look like this. */ 546 547static const bfd_byte elf_x86_64_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] = 548{ 549 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ 550 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ 551 0x68, /* pushq immediate */ 552 0, 0, 0, 0, /* replaced with index into relocation table. */ 553 0xe9, /* jmp relative */ 554 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ 555}; 556 557/* The first entry in a lazy procedure linkage table with BND prefix 558 like this. */ 559 560static const bfd_byte elf_x86_64_lazy_bnd_plt0_entry[LAZY_PLT_ENTRY_SIZE] = 561{ 562 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ 563 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */ 564 0x0f, 0x1f, 0 /* nopl (%rax) */ 565}; 566 567/* Subsequent entries for branches with BND prefx in a lazy procedure 568 linkage table look like this. */ 569 570static const bfd_byte elf_x86_64_lazy_bnd_plt_entry[LAZY_PLT_ENTRY_SIZE] = 571{ 572 0x68, 0, 0, 0, 0, /* pushq immediate */ 573 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */ 574 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */ 575}; 576 577/* The first entry in the IBT-enabled lazy procedure linkage table is the 578 the same as the lazy PLT with BND prefix so that bound registers are 579 preserved when control is passed to dynamic linker. Subsequent 580 entries for a IBT-enabled lazy procedure linkage table look like 581 this. */ 582 583static const bfd_byte elf_x86_64_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 584{ 585 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ 586 0x68, 0, 0, 0, 0, /* pushq immediate */ 587 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */ 588 0x90 /* nop */ 589}; 590 591/* The first entry in the x32 IBT-enabled lazy procedure linkage table 592 is the same as the normal lazy PLT. Subsequent entries for an 593 x32 IBT-enabled lazy procedure linkage table look like this. */ 594 595static const bfd_byte elf_x32_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 596{ 597 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ 598 0x68, 0, 0, 0, 0, /* pushq immediate */ 599 0xe9, 0, 0, 0, 0, /* jmpq relative */ 600 0x66, 0x90 /* xchg %ax,%ax */ 601}; 602 603/* Entries in the non-lazey procedure linkage table look like this. */ 604 605static const bfd_byte elf_x86_64_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = 606{ 607 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ 608 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ 609 0x66, 0x90 /* xchg %ax,%ax */ 610}; 611 612/* Entries for branches with BND prefix in the non-lazey procedure 613 linkage table look like this. */ 614 615static const bfd_byte elf_x86_64_non_lazy_bnd_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = 616{ 617 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */ 618 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ 619 0x90 /* nop */ 620}; 621 622/* Entries for branches with IBT-enabled in the non-lazey procedure 623 linkage table look like this. They have the same size as the lazy 624 PLT entry. */ 625 626static const bfd_byte elf_x86_64_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 627{ 628 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ 629 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */ 630 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ 631 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopl 0x0(%rax,%rax,1) */ 632}; 633 634/* Entries for branches with IBT-enabled in the x32 non-lazey procedure 635 linkage table look like this. They have the same size as the lazy 636 PLT entry. */ 637 638static const bfd_byte elf_x32_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 639{ 640 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ 641 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ 642 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ 643 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */ 644}; 645 646/* The TLSDESC entry in a lazy procedure linkage table. */ 647static const bfd_byte elf_x86_64_tlsdesc_plt_entry[LAZY_PLT_ENTRY_SIZE] = 648{ 649 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ 650 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ 651 0xff, 0x25, 16, 0, 0, 0 /* jmpq *GOT+TDG(%rip) */ 652}; 653 654/* .eh_frame covering the lazy .plt section. */ 655 656static const bfd_byte elf_x86_64_eh_frame_lazy_plt[] = 657{ 658 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 659 0, 0, 0, 0, /* CIE ID */ 660 1, /* CIE version */ 661 'z', 'R', 0, /* Augmentation string */ 662 1, /* Code alignment factor */ 663 0x78, /* Data alignment factor */ 664 16, /* Return address column */ 665 1, /* Augmentation size */ 666 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 667 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ 668 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ 669 DW_CFA_nop, DW_CFA_nop, 670 671 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 672 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 673 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ 674 0, 0, 0, 0, /* .plt size goes here */ 675 0, /* Augmentation size */ 676 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ 677 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 678 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ 679 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 680 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 681 11, /* Block length */ 682 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ 683 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ 684 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, 685 DW_OP_lit3, DW_OP_shl, DW_OP_plus, 686 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 687}; 688 689/* .eh_frame covering the lazy BND .plt section. */ 690 691static const bfd_byte elf_x86_64_eh_frame_lazy_bnd_plt[] = 692{ 693 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 694 0, 0, 0, 0, /* CIE ID */ 695 1, /* CIE version */ 696 'z', 'R', 0, /* Augmentation string */ 697 1, /* Code alignment factor */ 698 0x78, /* Data alignment factor */ 699 16, /* Return address column */ 700 1, /* Augmentation size */ 701 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 702 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ 703 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ 704 DW_CFA_nop, DW_CFA_nop, 705 706 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 707 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 708 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ 709 0, 0, 0, 0, /* .plt size goes here */ 710 0, /* Augmentation size */ 711 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ 712 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 713 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ 714 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 715 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 716 11, /* Block length */ 717 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ 718 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ 719 DW_OP_lit15, DW_OP_and, DW_OP_lit5, DW_OP_ge, 720 DW_OP_lit3, DW_OP_shl, DW_OP_plus, 721 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 722}; 723 724/* .eh_frame covering the lazy .plt section with IBT-enabled. */ 725 726static const bfd_byte elf_x86_64_eh_frame_lazy_ibt_plt[] = 727{ 728 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 729 0, 0, 0, 0, /* CIE ID */ 730 1, /* CIE version */ 731 'z', 'R', 0, /* Augmentation string */ 732 1, /* Code alignment factor */ 733 0x78, /* Data alignment factor */ 734 16, /* Return address column */ 735 1, /* Augmentation size */ 736 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 737 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ 738 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ 739 DW_CFA_nop, DW_CFA_nop, 740 741 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 742 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 743 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ 744 0, 0, 0, 0, /* .plt size goes here */ 745 0, /* Augmentation size */ 746 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ 747 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 748 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ 749 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 750 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 751 11, /* Block length */ 752 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ 753 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ 754 DW_OP_lit15, DW_OP_and, DW_OP_lit10, DW_OP_ge, 755 DW_OP_lit3, DW_OP_shl, DW_OP_plus, 756 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 757}; 758 759/* .eh_frame covering the x32 lazy .plt section with IBT-enabled. */ 760 761static const bfd_byte elf_x32_eh_frame_lazy_ibt_plt[] = 762{ 763 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 764 0, 0, 0, 0, /* CIE ID */ 765 1, /* CIE version */ 766 'z', 'R', 0, /* Augmentation string */ 767 1, /* Code alignment factor */ 768 0x78, /* Data alignment factor */ 769 16, /* Return address column */ 770 1, /* Augmentation size */ 771 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 772 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ 773 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ 774 DW_CFA_nop, DW_CFA_nop, 775 776 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 777 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 778 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ 779 0, 0, 0, 0, /* .plt size goes here */ 780 0, /* Augmentation size */ 781 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ 782 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 783 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ 784 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 785 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 786 11, /* Block length */ 787 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ 788 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ 789 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge, 790 DW_OP_lit3, DW_OP_shl, DW_OP_plus, 791 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 792}; 793 794/* .eh_frame covering the non-lazy .plt section. */ 795 796static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt[] = 797{ 798#define PLT_GOT_FDE_LENGTH 20 799 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 800 0, 0, 0, 0, /* CIE ID */ 801 1, /* CIE version */ 802 'z', 'R', 0, /* Augmentation string */ 803 1, /* Code alignment factor */ 804 0x78, /* Data alignment factor */ 805 16, /* Return address column */ 806 1, /* Augmentation size */ 807 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 808 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ 809 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ 810 DW_CFA_nop, DW_CFA_nop, 811 812 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 813 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 814 0, 0, 0, 0, /* the start of non-lazy .plt goes here */ 815 0, 0, 0, 0, /* non-lazy .plt size goes here */ 816 0, /* Augmentation size */ 817 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, 818 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 819}; 820 821/* These are the standard parameters. */ 822static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt = 823 { 824 elf_x86_64_lazy_plt0_entry, /* plt0_entry */ 825 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ 826 elf_x86_64_lazy_plt_entry, /* plt_entry */ 827 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 828 elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ 829 LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ 830 6, /* plt_tlsdesc_got1_offset */ 831 12, /* plt_tlsdesc_got2_offset */ 832 10, /* plt_tlsdesc_got1_insn_end */ 833 16, /* plt_tlsdesc_got2_insn_end */ 834 2, /* plt0_got1_offset */ 835 8, /* plt0_got2_offset */ 836 12, /* plt0_got2_insn_end */ 837 2, /* plt_got_offset */ 838 7, /* plt_reloc_offset */ 839 12, /* plt_plt_offset */ 840 6, /* plt_got_insn_size */ 841 LAZY_PLT_ENTRY_SIZE, /* plt_plt_insn_end */ 842 6, /* plt_lazy_offset */ 843 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */ 844 elf_x86_64_lazy_plt_entry, /* pic_plt_entry */ 845 elf_x86_64_eh_frame_lazy_plt, /* eh_frame_plt */ 846 sizeof (elf_x86_64_eh_frame_lazy_plt) /* eh_frame_plt_size */ 847 }; 848 849static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_plt = 850 { 851 elf_x86_64_non_lazy_plt_entry, /* plt_entry */ 852 elf_x86_64_non_lazy_plt_entry, /* pic_plt_entry */ 853 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 854 2, /* plt_got_offset */ 855 6, /* plt_got_insn_size */ 856 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ 857 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 858 }; 859 860static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_bnd_plt = 861 { 862 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */ 863 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ 864 elf_x86_64_lazy_bnd_plt_entry, /* plt_entry */ 865 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 866 elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ 867 LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ 868 6, /* plt_tlsdesc_got1_offset */ 869 12, /* plt_tlsdesc_got2_offset */ 870 10, /* plt_tlsdesc_got1_insn_end */ 871 16, /* plt_tlsdesc_got2_insn_end */ 872 2, /* plt0_got1_offset */ 873 1+8, /* plt0_got2_offset */ 874 1+12, /* plt0_got2_insn_end */ 875 1+2, /* plt_got_offset */ 876 1, /* plt_reloc_offset */ 877 7, /* plt_plt_offset */ 878 1+6, /* plt_got_insn_size */ 879 11, /* plt_plt_insn_end */ 880 0, /* plt_lazy_offset */ 881 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */ 882 elf_x86_64_lazy_bnd_plt_entry, /* pic_plt_entry */ 883 elf_x86_64_eh_frame_lazy_bnd_plt, /* eh_frame_plt */ 884 sizeof (elf_x86_64_eh_frame_lazy_bnd_plt) /* eh_frame_plt_size */ 885 }; 886 887static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_bnd_plt = 888 { 889 elf_x86_64_non_lazy_bnd_plt_entry, /* plt_entry */ 890 elf_x86_64_non_lazy_bnd_plt_entry, /* pic_plt_entry */ 891 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 892 1+2, /* plt_got_offset */ 893 1+6, /* plt_got_insn_size */ 894 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ 895 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 896 }; 897 898static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_ibt_plt = 899 { 900 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */ 901 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ 902 elf_x86_64_lazy_ibt_plt_entry, /* plt_entry */ 903 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 904 elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ 905 LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ 906 6, /* plt_tlsdesc_got1_offset */ 907 12, /* plt_tlsdesc_got2_offset */ 908 10, /* plt_tlsdesc_got1_insn_end */ 909 16, /* plt_tlsdesc_got2_insn_end */ 910 2, /* plt0_got1_offset */ 911 1+8, /* plt0_got2_offset */ 912 1+12, /* plt0_got2_insn_end */ 913 4+1+2, /* plt_got_offset */ 914 4+1, /* plt_reloc_offset */ 915 4+1+6, /* plt_plt_offset */ 916 4+1+6, /* plt_got_insn_size */ 917 4+1+5+5, /* plt_plt_insn_end */ 918 0, /* plt_lazy_offset */ 919 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */ 920 elf_x86_64_lazy_ibt_plt_entry, /* pic_plt_entry */ 921 elf_x86_64_eh_frame_lazy_ibt_plt, /* eh_frame_plt */ 922 sizeof (elf_x86_64_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */ 923 }; 924 925static const struct elf_x86_lazy_plt_layout elf_x32_lazy_ibt_plt = 926 { 927 elf_x86_64_lazy_plt0_entry, /* plt0_entry */ 928 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ 929 elf_x32_lazy_ibt_plt_entry, /* plt_entry */ 930 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 931 elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ 932 LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ 933 6, /* plt_tlsdesc_got1_offset */ 934 12, /* plt_tlsdesc_got2_offset */ 935 10, /* plt_tlsdesc_got1_insn_end */ 936 16, /* plt_tlsdesc_got2_insn_end */ 937 2, /* plt0_got1_offset */ 938 8, /* plt0_got2_offset */ 939 12, /* plt0_got2_insn_end */ 940 4+2, /* plt_got_offset */ 941 4+1, /* plt_reloc_offset */ 942 4+6, /* plt_plt_offset */ 943 4+6, /* plt_got_insn_size */ 944 4+5+5, /* plt_plt_insn_end */ 945 0, /* plt_lazy_offset */ 946 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */ 947 elf_x32_lazy_ibt_plt_entry, /* pic_plt_entry */ 948 elf_x32_eh_frame_lazy_ibt_plt, /* eh_frame_plt */ 949 sizeof (elf_x32_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */ 950 }; 951 952static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_ibt_plt = 953 { 954 elf_x86_64_non_lazy_ibt_plt_entry, /* plt_entry */ 955 elf_x86_64_non_lazy_ibt_plt_entry, /* pic_plt_entry */ 956 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 957 4+1+2, /* plt_got_offset */ 958 4+1+6, /* plt_got_insn_size */ 959 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ 960 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 961 }; 962 963static const struct elf_x86_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt = 964 { 965 elf_x32_non_lazy_ibt_plt_entry, /* plt_entry */ 966 elf_x32_non_lazy_ibt_plt_entry, /* pic_plt_entry */ 967 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 968 4+2, /* plt_got_offset */ 969 4+6, /* plt_got_insn_size */ 970 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ 971 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 972 }; 973 974 975static bool 976elf64_x86_64_elf_object_p (bfd *abfd) 977{ 978 /* Set the right machine number for an x86-64 elf64 file. */ 979 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); 980 return true; 981} 982 983static bool 984elf32_x86_64_elf_object_p (bfd *abfd) 985{ 986 /* Set the right machine number for an x86-64 elf32 file. */ 987 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32); 988 return true; 989} 990 991/* Return TRUE if the TLS access code sequence support transition 992 from R_TYPE. */ 993 994static bool 995elf_x86_64_check_tls_transition (bfd *abfd, 996 struct bfd_link_info *info, 997 asection *sec, 998 bfd_byte *contents, 999 Elf_Internal_Shdr *symtab_hdr, 1000 struct elf_link_hash_entry **sym_hashes, 1001 unsigned int r_type, 1002 const Elf_Internal_Rela *rel, 1003 const Elf_Internal_Rela *relend) 1004{ 1005 unsigned int val; 1006 unsigned long r_symndx; 1007 bool largepic = false; 1008 struct elf_link_hash_entry *h; 1009 bfd_vma offset; 1010 struct elf_x86_link_hash_table *htab; 1011 bfd_byte *call; 1012 bool indirect_call; 1013 1014 htab = elf_x86_hash_table (info, X86_64_ELF_DATA); 1015 offset = rel->r_offset; 1016 switch (r_type) 1017 { 1018 case R_X86_64_TLSGD: 1019 case R_X86_64_TLSLD: 1020 if ((rel + 1) >= relend) 1021 return false; 1022 1023 if (r_type == R_X86_64_TLSGD) 1024 { 1025 /* Check transition from GD access model. For 64bit, only 1026 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 1027 .word 0x6666; rex64; call __tls_get_addr@PLT 1028 or 1029 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 1030 .byte 0x66; rex64 1031 call *__tls_get_addr@GOTPCREL(%rip) 1032 which may be converted to 1033 addr32 call __tls_get_addr 1034 can transit to different access model. For 32bit, only 1035 leaq foo@tlsgd(%rip), %rdi 1036 .word 0x6666; rex64; call __tls_get_addr@PLT 1037 or 1038 leaq foo@tlsgd(%rip), %rdi 1039 .byte 0x66; rex64 1040 call *__tls_get_addr@GOTPCREL(%rip) 1041 which may be converted to 1042 addr32 call __tls_get_addr 1043 can transit to different access model. For largepic, 1044 we also support: 1045 leaq foo@tlsgd(%rip), %rdi 1046 movabsq $__tls_get_addr@pltoff, %rax 1047 addq $r15, %rax 1048 call *%rax 1049 or 1050 leaq foo@tlsgd(%rip), %rdi 1051 movabsq $__tls_get_addr@pltoff, %rax 1052 addq $rbx, %rax 1053 call *%rax */ 1054 1055 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d }; 1056 1057 if ((offset + 12) > sec->size) 1058 return false; 1059 1060 call = contents + offset + 4; 1061 if (call[0] != 0x66 1062 || !((call[1] == 0x48 1063 && call[2] == 0xff 1064 && call[3] == 0x15) 1065 || (call[1] == 0x48 1066 && call[2] == 0x67 1067 && call[3] == 0xe8) 1068 || (call[1] == 0x66 1069 && call[2] == 0x48 1070 && call[3] == 0xe8))) 1071 { 1072 if (!ABI_64_P (abfd) 1073 || (offset + 19) > sec->size 1074 || offset < 3 1075 || memcmp (call - 7, leaq + 1, 3) != 0 1076 || memcmp (call, "\x48\xb8", 2) != 0 1077 || call[11] != 0x01 1078 || call[13] != 0xff 1079 || call[14] != 0xd0 1080 || !((call[10] == 0x48 && call[12] == 0xd8) 1081 || (call[10] == 0x4c && call[12] == 0xf8))) 1082 return false; 1083 largepic = true; 1084 } 1085 else if (ABI_64_P (abfd)) 1086 { 1087 if (offset < 4 1088 || memcmp (contents + offset - 4, leaq, 4) != 0) 1089 return false; 1090 } 1091 else 1092 { 1093 if (offset < 3 1094 || memcmp (contents + offset - 3, leaq + 1, 3) != 0) 1095 return false; 1096 } 1097 indirect_call = call[2] == 0xff; 1098 } 1099 else 1100 { 1101 /* Check transition from LD access model. Only 1102 leaq foo@tlsld(%rip), %rdi; 1103 call __tls_get_addr@PLT 1104 or 1105 leaq foo@tlsld(%rip), %rdi; 1106 call *__tls_get_addr@GOTPCREL(%rip) 1107 which may be converted to 1108 addr32 call __tls_get_addr 1109 can transit to different access model. For largepic 1110 we also support: 1111 leaq foo@tlsld(%rip), %rdi 1112 movabsq $__tls_get_addr@pltoff, %rax 1113 addq $r15, %rax 1114 call *%rax 1115 or 1116 leaq foo@tlsld(%rip), %rdi 1117 movabsq $__tls_get_addr@pltoff, %rax 1118 addq $rbx, %rax 1119 call *%rax */ 1120 1121 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d }; 1122 1123 if (offset < 3 || (offset + 9) > sec->size) 1124 return false; 1125 1126 if (memcmp (contents + offset - 3, lea, 3) != 0) 1127 return false; 1128 1129 call = contents + offset + 4; 1130 if (!(call[0] == 0xe8 1131 || (call[0] == 0xff && call[1] == 0x15) 1132 || (call[0] == 0x67 && call[1] == 0xe8))) 1133 { 1134 if (!ABI_64_P (abfd) 1135 || (offset + 19) > sec->size 1136 || memcmp (call, "\x48\xb8", 2) != 0 1137 || call[11] != 0x01 1138 || call[13] != 0xff 1139 || call[14] != 0xd0 1140 || !((call[10] == 0x48 && call[12] == 0xd8) 1141 || (call[10] == 0x4c && call[12] == 0xf8))) 1142 return false; 1143 largepic = true; 1144 } 1145 indirect_call = call[0] == 0xff; 1146 } 1147 1148 r_symndx = htab->r_sym (rel[1].r_info); 1149 if (r_symndx < symtab_hdr->sh_info) 1150 return false; 1151 1152 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1153 if (h == NULL 1154 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr) 1155 return false; 1156 else 1157 { 1158 r_type = (ELF32_R_TYPE (rel[1].r_info) 1159 & ~R_X86_64_converted_reloc_bit); 1160 if (largepic) 1161 return r_type == R_X86_64_PLTOFF64; 1162 else if (indirect_call) 1163 return r_type == R_X86_64_GOTPCRELX; 1164 else 1165 return (r_type == R_X86_64_PC32 || r_type == R_X86_64_PLT32); 1166 } 1167 1168 case R_X86_64_GOTTPOFF: 1169 /* Check transition from IE access model: 1170 mov foo@gottpoff(%rip), %reg 1171 add foo@gottpoff(%rip), %reg 1172 */ 1173 1174 /* Check REX prefix first. */ 1175 if (offset >= 3 && (offset + 4) <= sec->size) 1176 { 1177 val = bfd_get_8 (abfd, contents + offset - 3); 1178 if (val != 0x48 && val != 0x4c) 1179 { 1180 /* X32 may have 0x44 REX prefix or no REX prefix. */ 1181 if (ABI_64_P (abfd)) 1182 return false; 1183 } 1184 } 1185 else 1186 { 1187 /* X32 may not have any REX prefix. */ 1188 if (ABI_64_P (abfd)) 1189 return false; 1190 if (offset < 2 || (offset + 3) > sec->size) 1191 return false; 1192 } 1193 1194 val = bfd_get_8 (abfd, contents + offset - 2); 1195 if (val != 0x8b && val != 0x03) 1196 return false; 1197 1198 val = bfd_get_8 (abfd, contents + offset - 1); 1199 return (val & 0xc7) == 5; 1200 1201 case R_X86_64_GOTPC32_TLSDESC: 1202 /* Check transition from GDesc access model: 1203 leaq x@tlsdesc(%rip), %rax <--- LP64 mode. 1204 rex leal x@tlsdesc(%rip), %eax <--- X32 mode. 1205 1206 Make sure it's a leaq adding rip to a 32-bit offset 1207 into any register, although it's probably almost always 1208 going to be rax. */ 1209 1210 if (offset < 3 || (offset + 4) > sec->size) 1211 return false; 1212 1213 val = bfd_get_8 (abfd, contents + offset - 3); 1214 val &= 0xfb; 1215 if (val != 0x48 && (ABI_64_P (abfd) || val != 0x40)) 1216 return false; 1217 1218 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) 1219 return false; 1220 1221 val = bfd_get_8 (abfd, contents + offset - 1); 1222 return (val & 0xc7) == 0x05; 1223 1224 case R_X86_64_TLSDESC_CALL: 1225 /* Check transition from GDesc access model: 1226 call *x@tlsdesc(%rax) <--- LP64 mode. 1227 call *x@tlsdesc(%eax) <--- X32 mode. 1228 */ 1229 if (offset + 2 <= sec->size) 1230 { 1231 unsigned int prefix; 1232 call = contents + offset; 1233 prefix = 0; 1234 if (!ABI_64_P (abfd)) 1235 { 1236 /* Check for call *x@tlsdesc(%eax). */ 1237 if (call[0] == 0x67) 1238 { 1239 prefix = 1; 1240 if (offset + 3 > sec->size) 1241 return false; 1242 } 1243 } 1244 /* Make sure that it's a call *x@tlsdesc(%rax). */ 1245 return call[prefix] == 0xff && call[1 + prefix] == 0x10; 1246 } 1247 1248 return false; 1249 1250 default: 1251 abort (); 1252 } 1253} 1254 1255/* Return TRUE if the TLS access transition is OK or no transition 1256 will be performed. Update R_TYPE if there is a transition. */ 1257 1258static bool 1259elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd, 1260 asection *sec, bfd_byte *contents, 1261 Elf_Internal_Shdr *symtab_hdr, 1262 struct elf_link_hash_entry **sym_hashes, 1263 unsigned int *r_type, int tls_type, 1264 const Elf_Internal_Rela *rel, 1265 const Elf_Internal_Rela *relend, 1266 struct elf_link_hash_entry *h, 1267 unsigned long r_symndx, 1268 bool from_relocate_section) 1269{ 1270 unsigned int from_type = *r_type; 1271 unsigned int to_type = from_type; 1272 bool check = true; 1273 1274 /* Skip TLS transition for functions. */ 1275 if (h != NULL 1276 && (h->type == STT_FUNC 1277 || h->type == STT_GNU_IFUNC)) 1278 return true; 1279 1280 switch (from_type) 1281 { 1282 case R_X86_64_TLSGD: 1283 case R_X86_64_GOTPC32_TLSDESC: 1284 case R_X86_64_TLSDESC_CALL: 1285 case R_X86_64_GOTTPOFF: 1286 if (bfd_link_executable (info)) 1287 { 1288 if (h == NULL) 1289 to_type = R_X86_64_TPOFF32; 1290 else 1291 to_type = R_X86_64_GOTTPOFF; 1292 } 1293 1294 /* When we are called from elf_x86_64_relocate_section, there may 1295 be additional transitions based on TLS_TYPE. */ 1296 if (from_relocate_section) 1297 { 1298 unsigned int new_to_type = to_type; 1299 1300 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type)) 1301 new_to_type = R_X86_64_TPOFF32; 1302 1303 if (to_type == R_X86_64_TLSGD 1304 || to_type == R_X86_64_GOTPC32_TLSDESC 1305 || to_type == R_X86_64_TLSDESC_CALL) 1306 { 1307 if (tls_type == GOT_TLS_IE) 1308 new_to_type = R_X86_64_GOTTPOFF; 1309 } 1310 1311 /* We checked the transition before when we were called from 1312 elf_x86_64_scan_relocs. We only want to check the new 1313 transition which hasn't been checked before. */ 1314 check = new_to_type != to_type && from_type == to_type; 1315 to_type = new_to_type; 1316 } 1317 1318 break; 1319 1320 case R_X86_64_TLSLD: 1321 if (bfd_link_executable (info)) 1322 to_type = R_X86_64_TPOFF32; 1323 break; 1324 1325 default: 1326 return true; 1327 } 1328 1329 /* Return TRUE if there is no transition. */ 1330 if (from_type == to_type) 1331 return true; 1332 1333 /* Check if the transition can be performed. */ 1334 if (check 1335 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents, 1336 symtab_hdr, sym_hashes, 1337 from_type, rel, relend)) 1338 { 1339 reloc_howto_type *from, *to; 1340 const char *name; 1341 1342 from = elf_x86_64_rtype_to_howto (abfd, from_type); 1343 to = elf_x86_64_rtype_to_howto (abfd, to_type); 1344 1345 if (from == NULL || to == NULL) 1346 return false; 1347 1348 if (h) 1349 name = h->root.root.string; 1350 else 1351 { 1352 struct elf_x86_link_hash_table *htab; 1353 1354 htab = elf_x86_hash_table (info, X86_64_ELF_DATA); 1355 if (htab == NULL) 1356 name = "*unknown*"; 1357 else 1358 { 1359 Elf_Internal_Sym *isym; 1360 1361 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, 1362 abfd, r_symndx); 1363 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); 1364 } 1365 } 1366 1367 _bfd_error_handler 1368 /* xgettext:c-format */ 1369 (_("%pB: TLS transition from %s to %s against `%s' at %#" PRIx64 1370 " in section `%pA' failed"), 1371 abfd, from->name, to->name, name, (uint64_t) rel->r_offset, sec); 1372 bfd_set_error (bfd_error_bad_value); 1373 return false; 1374 } 1375 1376 *r_type = to_type; 1377 return true; 1378} 1379 1380static bool 1381elf_x86_64_need_pic (struct bfd_link_info *info, 1382 bfd *input_bfd, asection *sec, 1383 struct elf_link_hash_entry *h, 1384 Elf_Internal_Shdr *symtab_hdr, 1385 Elf_Internal_Sym *isym, 1386 reloc_howto_type *howto) 1387{ 1388 const char *v = ""; 1389 const char *und = ""; 1390 const char *pic = ""; 1391 const char *object; 1392 1393 const char *name; 1394 if (h) 1395 { 1396 name = h->root.root.string; 1397 switch (ELF_ST_VISIBILITY (h->other)) 1398 { 1399 case STV_HIDDEN: 1400 v = _("hidden symbol "); 1401 break; 1402 case STV_INTERNAL: 1403 v = _("internal symbol "); 1404 break; 1405 case STV_PROTECTED: 1406 v = _("protected symbol "); 1407 break; 1408 default: 1409 if (((struct elf_x86_link_hash_entry *) h)->def_protected) 1410 v = _("protected symbol "); 1411 else 1412 v = _("symbol "); 1413 pic = NULL; 1414 break; 1415 } 1416 1417 if (!SYMBOL_DEFINED_NON_SHARED_P (h) && !h->def_dynamic) 1418 und = _("undefined "); 1419 } 1420 else 1421 { 1422 name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL); 1423 pic = NULL; 1424 } 1425 1426 if (bfd_link_dll (info)) 1427 { 1428 object = _("a shared object"); 1429 if (!pic) 1430 pic = _("; recompile with -fPIC"); 1431 } 1432 else 1433 { 1434 if (bfd_link_pie (info)) 1435 object = _("a PIE object"); 1436 else 1437 object = _("a PDE object"); 1438 if (!pic) 1439 pic = _("; recompile with -fPIE"); 1440 } 1441 1442 /* xgettext:c-format */ 1443 _bfd_error_handler (_("%pB: relocation %s against %s%s`%s' can " 1444 "not be used when making %s%s"), 1445 input_bfd, howto->name, und, v, name, 1446 object, pic); 1447 bfd_set_error (bfd_error_bad_value); 1448 sec->check_relocs_failed = 1; 1449 return false; 1450} 1451 1452/* With the local symbol, foo, we convert 1453 mov foo@GOTPCREL(%rip), %reg 1454 to 1455 lea foo(%rip), %reg 1456 and convert 1457 call/jmp *foo@GOTPCREL(%rip) 1458 to 1459 nop call foo/jmp foo nop 1460 When PIC is false, convert 1461 test %reg, foo@GOTPCREL(%rip) 1462 to 1463 test $foo, %reg 1464 and convert 1465 binop foo@GOTPCREL(%rip), %reg 1466 to 1467 binop $foo, %reg 1468 where binop is one of adc, add, and, cmp, or, sbb, sub, xor 1469 instructions. */ 1470 1471static bool 1472elf_x86_64_convert_load_reloc (bfd *abfd, 1473 bfd_byte *contents, 1474 unsigned int *r_type_p, 1475 Elf_Internal_Rela *irel, 1476 struct elf_link_hash_entry *h, 1477 bool *converted, 1478 struct bfd_link_info *link_info) 1479{ 1480 struct elf_x86_link_hash_table *htab; 1481 bool is_pic; 1482 bool no_overflow; 1483 bool relocx; 1484 bool to_reloc_pc32; 1485 bool abs_symbol; 1486 bool local_ref; 1487 asection *tsec; 1488 bfd_signed_vma raddend; 1489 unsigned int opcode; 1490 unsigned int modrm; 1491 unsigned int r_type = *r_type_p; 1492 unsigned int r_symndx; 1493 bfd_vma roff = irel->r_offset; 1494 bfd_vma abs_relocation; 1495 1496 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2)) 1497 return true; 1498 1499 raddend = irel->r_addend; 1500 /* Addend for 32-bit PC-relative relocation must be -4. */ 1501 if (raddend != -4) 1502 return true; 1503 1504 htab = elf_x86_hash_table (link_info, X86_64_ELF_DATA); 1505 is_pic = bfd_link_pic (link_info); 1506 1507 relocx = (r_type == R_X86_64_GOTPCRELX 1508 || r_type == R_X86_64_REX_GOTPCRELX); 1509 1510 /* TRUE if --no-relax is used. */ 1511 no_overflow = link_info->disable_target_specific_optimizations > 1; 1512 1513 r_symndx = htab->r_sym (irel->r_info); 1514 1515 opcode = bfd_get_8 (abfd, contents + roff - 2); 1516 1517 /* Convert mov to lea since it has been done for a while. */ 1518 if (opcode != 0x8b) 1519 { 1520 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX 1521 for call, jmp or one of adc, add, and, cmp, or, sbb, sub, 1522 test, xor instructions. */ 1523 if (!relocx) 1524 return true; 1525 } 1526 1527 /* We convert only to R_X86_64_PC32: 1528 1. Branch. 1529 2. R_X86_64_GOTPCREL since we can't modify REX byte. 1530 3. no_overflow is true. 1531 4. PIC. 1532 */ 1533 to_reloc_pc32 = (opcode == 0xff 1534 || !relocx 1535 || no_overflow 1536 || is_pic); 1537 1538 abs_symbol = false; 1539 abs_relocation = 0; 1540 1541 /* Get the symbol referred to by the reloc. */ 1542 if (h == NULL) 1543 { 1544 Elf_Internal_Sym *isym 1545 = bfd_sym_from_r_symndx (&htab->elf.sym_cache, abfd, r_symndx); 1546 1547 /* Skip relocation against undefined symbols. */ 1548 if (isym->st_shndx == SHN_UNDEF) 1549 return true; 1550 1551 local_ref = true; 1552 if (isym->st_shndx == SHN_ABS) 1553 { 1554 tsec = bfd_abs_section_ptr; 1555 abs_symbol = true; 1556 abs_relocation = isym->st_value; 1557 } 1558 else if (isym->st_shndx == SHN_COMMON) 1559 tsec = bfd_com_section_ptr; 1560 else if (isym->st_shndx == SHN_X86_64_LCOMMON) 1561 tsec = &_bfd_elf_large_com_section; 1562 else 1563 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 1564 } 1565 else 1566 { 1567 /* Undefined weak symbol is only bound locally in executable 1568 and its reference is resolved as 0 without relocation 1569 overflow. We can only perform this optimization for 1570 GOTPCRELX relocations since we need to modify REX byte. 1571 It is OK convert mov with R_X86_64_GOTPCREL to 1572 R_X86_64_PC32. */ 1573 struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h); 1574 1575 abs_symbol = ABS_SYMBOL_P (h); 1576 abs_relocation = h->root.u.def.value; 1577 1578 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */ 1579 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h); 1580 if ((relocx || opcode == 0x8b) 1581 && (h->root.type == bfd_link_hash_undefweak 1582 && !eh->linker_def 1583 && local_ref)) 1584 { 1585 if (opcode == 0xff) 1586 { 1587 /* Skip for branch instructions since R_X86_64_PC32 1588 may overflow. */ 1589 if (no_overflow) 1590 return true; 1591 } 1592 else if (relocx) 1593 { 1594 /* For non-branch instructions, we can convert to 1595 R_X86_64_32/R_X86_64_32S since we know if there 1596 is a REX byte. */ 1597 to_reloc_pc32 = false; 1598 } 1599 1600 /* Since we don't know the current PC when PIC is true, 1601 we can't convert to R_X86_64_PC32. */ 1602 if (to_reloc_pc32 && is_pic) 1603 return true; 1604 1605 goto convert; 1606 } 1607 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since 1608 ld.so may use its link-time address. */ 1609 else if (h->start_stop 1610 || eh->linker_def 1611 || ((h->def_regular 1612 || h->root.type == bfd_link_hash_defined 1613 || h->root.type == bfd_link_hash_defweak) 1614 && h != htab->elf.hdynamic 1615 && local_ref)) 1616 { 1617 /* bfd_link_hash_new or bfd_link_hash_undefined is 1618 set by an assignment in a linker script in 1619 bfd_elf_record_link_assignment. start_stop is set 1620 on __start_SECNAME/__stop_SECNAME which mark section 1621 SECNAME. */ 1622 if (h->start_stop 1623 || eh->linker_def 1624 || (h->def_regular 1625 && (h->root.type == bfd_link_hash_new 1626 || h->root.type == bfd_link_hash_undefined 1627 || ((h->root.type == bfd_link_hash_defined 1628 || h->root.type == bfd_link_hash_defweak) 1629 && h->root.u.def.section == bfd_und_section_ptr)))) 1630 { 1631 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */ 1632 if (no_overflow) 1633 return true; 1634 goto convert; 1635 } 1636 tsec = h->root.u.def.section; 1637 } 1638 else 1639 return true; 1640 } 1641 1642 /* Don't convert GOTPCREL relocation against large section. */ 1643 if (elf_section_data (tsec) != NULL 1644 && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0) 1645 return true; 1646 1647 /* Skip since R_X86_64_PC32/R_X86_64_32/R_X86_64_32S may overflow. */ 1648 if (no_overflow) 1649 return true; 1650 1651 convert: 1652 if (opcode == 0xff) 1653 { 1654 /* We have "call/jmp *foo@GOTPCREL(%rip)". */ 1655 unsigned int nop; 1656 unsigned int disp; 1657 bfd_vma nop_offset; 1658 1659 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to 1660 R_X86_64_PC32. */ 1661 modrm = bfd_get_8 (abfd, contents + roff - 1); 1662 if (modrm == 0x25) 1663 { 1664 /* Convert to "jmp foo nop". */ 1665 modrm = 0xe9; 1666 nop = NOP_OPCODE; 1667 nop_offset = irel->r_offset + 3; 1668 disp = bfd_get_32 (abfd, contents + irel->r_offset); 1669 irel->r_offset -= 1; 1670 bfd_put_32 (abfd, disp, contents + irel->r_offset); 1671 } 1672 else 1673 { 1674 struct elf_x86_link_hash_entry *eh 1675 = (struct elf_x86_link_hash_entry *) h; 1676 1677 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE 1678 is a nop prefix. */ 1679 modrm = 0xe8; 1680 /* To support TLS optimization, always use addr32 prefix for 1681 "call *__tls_get_addr@GOTPCREL(%rip)". */ 1682 if (eh && eh->tls_get_addr) 1683 { 1684 nop = 0x67; 1685 nop_offset = irel->r_offset - 2; 1686 } 1687 else 1688 { 1689 nop = htab->params->call_nop_byte; 1690 if (htab->params->call_nop_as_suffix) 1691 { 1692 nop_offset = irel->r_offset + 3; 1693 disp = bfd_get_32 (abfd, contents + irel->r_offset); 1694 irel->r_offset -= 1; 1695 bfd_put_32 (abfd, disp, contents + irel->r_offset); 1696 } 1697 else 1698 nop_offset = irel->r_offset - 2; 1699 } 1700 } 1701 bfd_put_8 (abfd, nop, contents + nop_offset); 1702 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1); 1703 r_type = R_X86_64_PC32; 1704 } 1705 else 1706 { 1707 unsigned int rex; 1708 unsigned int rex_mask = REX_R; 1709 1710 if (r_type == R_X86_64_REX_GOTPCRELX) 1711 rex = bfd_get_8 (abfd, contents + roff - 3); 1712 else 1713 rex = 0; 1714 1715 if (opcode == 0x8b) 1716 { 1717 if (abs_symbol && local_ref && relocx) 1718 to_reloc_pc32 = false; 1719 1720 if (to_reloc_pc32) 1721 { 1722 /* Convert "mov foo@GOTPCREL(%rip), %reg" to 1723 "lea foo(%rip), %reg". */ 1724 opcode = 0x8d; 1725 r_type = R_X86_64_PC32; 1726 } 1727 else 1728 { 1729 /* Convert "mov foo@GOTPCREL(%rip), %reg" to 1730 "mov $foo, %reg". */ 1731 opcode = 0xc7; 1732 modrm = bfd_get_8 (abfd, contents + roff - 1); 1733 modrm = 0xc0 | (modrm & 0x38) >> 3; 1734 if ((rex & REX_W) != 0 1735 && ABI_64_P (link_info->output_bfd)) 1736 { 1737 /* Keep the REX_W bit in REX byte for LP64. */ 1738 r_type = R_X86_64_32S; 1739 goto rewrite_modrm_rex; 1740 } 1741 else 1742 { 1743 /* If the REX_W bit in REX byte isn't needed, 1744 use R_X86_64_32 and clear the W bit to avoid 1745 sign-extend imm32 to imm64. */ 1746 r_type = R_X86_64_32; 1747 /* Clear the W bit in REX byte. */ 1748 rex_mask |= REX_W; 1749 goto rewrite_modrm_rex; 1750 } 1751 } 1752 } 1753 else 1754 { 1755 /* R_X86_64_PC32 isn't supported. */ 1756 if (to_reloc_pc32) 1757 return true; 1758 1759 modrm = bfd_get_8 (abfd, contents + roff - 1); 1760 if (opcode == 0x85) 1761 { 1762 /* Convert "test %reg, foo@GOTPCREL(%rip)" to 1763 "test $foo, %reg". */ 1764 modrm = 0xc0 | (modrm & 0x38) >> 3; 1765 opcode = 0xf7; 1766 } 1767 else 1768 { 1769 /* Convert "binop foo@GOTPCREL(%rip), %reg" to 1770 "binop $foo, %reg". */ 1771 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c); 1772 opcode = 0x81; 1773 } 1774 1775 /* Use R_X86_64_32 with 32-bit operand to avoid relocation 1776 overflow when sign-extending imm32 to imm64. */ 1777 r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32; 1778 1779 rewrite_modrm_rex: 1780 if (abs_relocation) 1781 { 1782 /* Check if R_X86_64_32S/R_X86_64_32 fits. */ 1783 if (r_type == R_X86_64_32S) 1784 { 1785 if ((abs_relocation + 0x80000000) > 0xffffffff) 1786 return true; 1787 } 1788 else 1789 { 1790 if (abs_relocation > 0xffffffff) 1791 return true; 1792 } 1793 } 1794 1795 bfd_put_8 (abfd, modrm, contents + roff - 1); 1796 1797 if (rex) 1798 { 1799 /* Move the R bit to the B bit in REX byte. */ 1800 rex = (rex & ~rex_mask) | (rex & REX_R) >> 2; 1801 bfd_put_8 (abfd, rex, contents + roff - 3); 1802 } 1803 1804 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */ 1805 irel->r_addend = 0; 1806 } 1807 1808 bfd_put_8 (abfd, opcode, contents + roff - 2); 1809 } 1810 1811 *r_type_p = r_type; 1812 irel->r_info = htab->r_info (r_symndx, 1813 r_type | R_X86_64_converted_reloc_bit); 1814 1815 *converted = true; 1816 1817 return true; 1818} 1819 1820/* Look through the relocs for a section during the first phase, and 1821 calculate needed space in the global offset table, and procedure 1822 linkage table. */ 1823 1824static bool 1825elf_x86_64_scan_relocs (bfd *abfd, struct bfd_link_info *info, 1826 asection *sec, 1827 const Elf_Internal_Rela *relocs) 1828{ 1829 struct elf_x86_link_hash_table *htab; 1830 Elf_Internal_Shdr *symtab_hdr; 1831 struct elf_link_hash_entry **sym_hashes; 1832 const Elf_Internal_Rela *rel; 1833 const Elf_Internal_Rela *rel_end; 1834 bfd_byte *contents; 1835 bool converted; 1836 1837 if (bfd_link_relocatable (info)) 1838 return true; 1839 1840 htab = elf_x86_hash_table (info, X86_64_ELF_DATA); 1841 if (htab == NULL) 1842 { 1843 sec->check_relocs_failed = 1; 1844 return false; 1845 } 1846 1847 BFD_ASSERT (is_x86_elf (abfd, htab)); 1848 1849 /* Get the section contents. */ 1850 if (elf_section_data (sec)->this_hdr.contents != NULL) 1851 contents = elf_section_data (sec)->this_hdr.contents; 1852 else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1853 { 1854 sec->check_relocs_failed = 1; 1855 return false; 1856 } 1857 1858 symtab_hdr = &elf_symtab_hdr (abfd); 1859 sym_hashes = elf_sym_hashes (abfd); 1860 1861 converted = false; 1862 1863 rel_end = relocs + sec->reloc_count; 1864 for (rel = relocs; rel < rel_end; rel++) 1865 { 1866 unsigned int r_type; 1867 unsigned int r_symndx; 1868 struct elf_link_hash_entry *h; 1869 struct elf_x86_link_hash_entry *eh; 1870 Elf_Internal_Sym *isym; 1871 const char *name; 1872 bool size_reloc; 1873 bool converted_reloc; 1874 bool no_dynreloc; 1875 1876 r_symndx = htab->r_sym (rel->r_info); 1877 r_type = ELF32_R_TYPE (rel->r_info); 1878 1879 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 1880 { 1881 /* xgettext:c-format */ 1882 _bfd_error_handler (_("%pB: bad symbol index: %d"), 1883 abfd, r_symndx); 1884 goto error_return; 1885 } 1886 1887 if (r_symndx < symtab_hdr->sh_info) 1888 { 1889 /* A local symbol. */ 1890 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, 1891 abfd, r_symndx); 1892 if (isym == NULL) 1893 goto error_return; 1894 1895 /* Check relocation against local STT_GNU_IFUNC symbol. */ 1896 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1897 { 1898 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, 1899 true); 1900 if (h == NULL) 1901 goto error_return; 1902 1903 /* Fake a STT_GNU_IFUNC symbol. */ 1904 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr, 1905 isym, NULL); 1906 h->type = STT_GNU_IFUNC; 1907 h->def_regular = 1; 1908 h->ref_regular = 1; 1909 h->forced_local = 1; 1910 h->root.type = bfd_link_hash_defined; 1911 } 1912 else 1913 h = NULL; 1914 } 1915 else 1916 { 1917 isym = NULL; 1918 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1919 while (h->root.type == bfd_link_hash_indirect 1920 || h->root.type == bfd_link_hash_warning) 1921 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1922 } 1923 1924 /* Check invalid x32 relocations. */ 1925 if (!ABI_64_P (abfd)) 1926 switch (r_type) 1927 { 1928 default: 1929 break; 1930 1931 case R_X86_64_DTPOFF64: 1932 case R_X86_64_TPOFF64: 1933 case R_X86_64_PC64: 1934 case R_X86_64_GOTOFF64: 1935 case R_X86_64_GOT64: 1936 case R_X86_64_GOTPCREL64: 1937 case R_X86_64_GOTPC64: 1938 case R_X86_64_GOTPLT64: 1939 case R_X86_64_PLTOFF64: 1940 { 1941 if (h) 1942 name = h->root.root.string; 1943 else 1944 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, 1945 NULL); 1946 _bfd_error_handler 1947 /* xgettext:c-format */ 1948 (_("%pB: relocation %s against symbol `%s' isn't " 1949 "supported in x32 mode"), abfd, 1950 x86_64_elf_howto_table[r_type].name, name); 1951 bfd_set_error (bfd_error_bad_value); 1952 goto error_return; 1953 } 1954 break; 1955 } 1956 1957 eh = (struct elf_x86_link_hash_entry *) h; 1958 1959 if (h != NULL) 1960 { 1961 /* It is referenced by a non-shared object. */ 1962 h->ref_regular = 1; 1963 } 1964 1965 converted_reloc = false; 1966 if ((r_type == R_X86_64_GOTPCREL 1967 || r_type == R_X86_64_GOTPCRELX 1968 || r_type == R_X86_64_REX_GOTPCRELX) 1969 && (h == NULL || h->type != STT_GNU_IFUNC)) 1970 { 1971 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel; 1972 if (!elf_x86_64_convert_load_reloc (abfd, contents, &r_type, 1973 irel, h, &converted_reloc, 1974 info)) 1975 goto error_return; 1976 1977 if (converted_reloc) 1978 converted = true; 1979 } 1980 1981 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym, 1982 symtab_hdr, &no_dynreloc)) 1983 return false; 1984 1985 if (! elf_x86_64_tls_transition (info, abfd, sec, contents, 1986 symtab_hdr, sym_hashes, 1987 &r_type, GOT_UNKNOWN, 1988 rel, rel_end, h, r_symndx, false)) 1989 goto error_return; 1990 1991 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */ 1992 if (h == htab->elf.hgot) 1993 htab->got_referenced = true; 1994 1995 switch (r_type) 1996 { 1997 case R_X86_64_TLSLD: 1998 htab->tls_ld_or_ldm_got.refcount = 1; 1999 goto create_got; 2000 2001 case R_X86_64_TPOFF32: 2002 if (!bfd_link_executable (info) && ABI_64_P (abfd)) 2003 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym, 2004 &x86_64_elf_howto_table[r_type]); 2005 if (eh != NULL) 2006 eh->zero_undefweak &= 0x2; 2007 break; 2008 2009 case R_X86_64_GOTTPOFF: 2010 if (!bfd_link_executable (info)) 2011 info->flags |= DF_STATIC_TLS; 2012 /* Fall through */ 2013 2014 case R_X86_64_GOT32: 2015 case R_X86_64_GOTPCREL: 2016 case R_X86_64_GOTPCRELX: 2017 case R_X86_64_REX_GOTPCRELX: 2018 case R_X86_64_TLSGD: 2019 case R_X86_64_GOT64: 2020 case R_X86_64_GOTPCREL64: 2021 case R_X86_64_GOTPLT64: 2022 case R_X86_64_GOTPC32_TLSDESC: 2023 case R_X86_64_TLSDESC_CALL: 2024 /* This symbol requires a global offset table entry. */ 2025 { 2026 int tls_type, old_tls_type; 2027 2028 switch (r_type) 2029 { 2030 default: 2031 tls_type = GOT_NORMAL; 2032 if (h) 2033 { 2034 if (ABS_SYMBOL_P (h)) 2035 tls_type = GOT_ABS; 2036 } 2037 else if (isym->st_shndx == SHN_ABS) 2038 tls_type = GOT_ABS; 2039 break; 2040 case R_X86_64_TLSGD: 2041 tls_type = GOT_TLS_GD; 2042 break; 2043 case R_X86_64_GOTTPOFF: 2044 tls_type = GOT_TLS_IE; 2045 break; 2046 case R_X86_64_GOTPC32_TLSDESC: 2047 case R_X86_64_TLSDESC_CALL: 2048 tls_type = GOT_TLS_GDESC; 2049 break; 2050 } 2051 2052 if (h != NULL) 2053 { 2054 h->got.refcount = 1; 2055 old_tls_type = eh->tls_type; 2056 } 2057 else 2058 { 2059 bfd_signed_vma *local_got_refcounts; 2060 2061 if (!elf_x86_allocate_local_got_info (abfd, 2062 symtab_hdr->sh_info)) 2063 goto error_return; 2064 2065 /* This is a global offset table entry for a local symbol. */ 2066 local_got_refcounts = elf_local_got_refcounts (abfd); 2067 local_got_refcounts[r_symndx] = 1; 2068 old_tls_type 2069 = elf_x86_local_got_tls_type (abfd) [r_symndx]; 2070 } 2071 2072 /* If a TLS symbol is accessed using IE at least once, 2073 there is no point to use dynamic model for it. */ 2074 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN 2075 && (! GOT_TLS_GD_ANY_P (old_tls_type) 2076 || tls_type != GOT_TLS_IE)) 2077 { 2078 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type)) 2079 tls_type = old_tls_type; 2080 else if (GOT_TLS_GD_ANY_P (old_tls_type) 2081 && GOT_TLS_GD_ANY_P (tls_type)) 2082 tls_type |= old_tls_type; 2083 else 2084 { 2085 if (h) 2086 name = h->root.root.string; 2087 else 2088 name = bfd_elf_sym_name (abfd, symtab_hdr, 2089 isym, NULL); 2090 _bfd_error_handler 2091 /* xgettext:c-format */ 2092 (_("%pB: '%s' accessed both as normal and" 2093 " thread local symbol"), 2094 abfd, name); 2095 bfd_set_error (bfd_error_bad_value); 2096 goto error_return; 2097 } 2098 } 2099 2100 if (old_tls_type != tls_type) 2101 { 2102 if (eh != NULL) 2103 eh->tls_type = tls_type; 2104 else 2105 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type; 2106 } 2107 } 2108 /* Fall through */ 2109 2110 case R_X86_64_GOTOFF64: 2111 case R_X86_64_GOTPC32: 2112 case R_X86_64_GOTPC64: 2113 create_got: 2114 if (eh != NULL) 2115 eh->zero_undefweak &= 0x2; 2116 break; 2117 2118 case R_X86_64_PLT32: 2119 case R_X86_64_PLT32_BND: 2120 /* This symbol requires a procedure linkage table entry. We 2121 actually build the entry in adjust_dynamic_symbol, 2122 because this might be a case of linking PIC code which is 2123 never referenced by a dynamic object, in which case we 2124 don't need to generate a procedure linkage table entry 2125 after all. */ 2126 2127 /* If this is a local symbol, we resolve it directly without 2128 creating a procedure linkage table entry. */ 2129 if (h == NULL) 2130 continue; 2131 2132 eh->zero_undefweak &= 0x2; 2133 h->needs_plt = 1; 2134 h->plt.refcount = 1; 2135 break; 2136 2137 case R_X86_64_PLTOFF64: 2138 /* This tries to form the 'address' of a function relative 2139 to GOT. For global symbols we need a PLT entry. */ 2140 if (h != NULL) 2141 { 2142 h->needs_plt = 1; 2143 h->plt.refcount = 1; 2144 } 2145 goto create_got; 2146 2147 case R_X86_64_SIZE32: 2148 case R_X86_64_SIZE64: 2149 size_reloc = true; 2150 goto do_size; 2151 2152 case R_X86_64_32: 2153 if (!ABI_64_P (abfd)) 2154 goto pointer; 2155 /* Fall through. */ 2156 case R_X86_64_8: 2157 case R_X86_64_16: 2158 case R_X86_64_32S: 2159 /* Check relocation overflow as these relocs may lead to 2160 run-time relocation overflow. Don't error out for 2161 sections we don't care about, such as debug sections or 2162 when relocation overflow check is disabled. */ 2163 if (!htab->params->no_reloc_overflow_check 2164 && !converted_reloc 2165 && (bfd_link_pic (info) 2166 || (bfd_link_executable (info) 2167 && h != NULL 2168 && !h->def_regular 2169 && h->def_dynamic 2170 && (sec->flags & SEC_READONLY) == 0))) 2171 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym, 2172 &x86_64_elf_howto_table[r_type]); 2173 /* Fall through. */ 2174 2175 case R_X86_64_PC8: 2176 case R_X86_64_PC16: 2177 case R_X86_64_PC32: 2178 case R_X86_64_PC32_BND: 2179 case R_X86_64_PC64: 2180 case R_X86_64_64: 2181 pointer: 2182 if (eh != NULL && (sec->flags & SEC_CODE) != 0) 2183 eh->zero_undefweak |= 0x2; 2184 /* We are called after all symbols have been resolved. Only 2185 relocation against STT_GNU_IFUNC symbol must go through 2186 PLT. */ 2187 if (h != NULL 2188 && (bfd_link_executable (info) 2189 || h->type == STT_GNU_IFUNC)) 2190 { 2191 bool func_pointer_ref = false; 2192 2193 if (r_type == R_X86_64_PC32) 2194 { 2195 /* Since something like ".long foo - ." may be used 2196 as pointer, make sure that PLT is used if foo is 2197 a function defined in a shared library. */ 2198 if ((sec->flags & SEC_CODE) == 0) 2199 { 2200 h->pointer_equality_needed = 1; 2201 if (bfd_link_pie (info) 2202 && h->type == STT_FUNC 2203 && !h->def_regular 2204 && h->def_dynamic) 2205 { 2206 h->needs_plt = 1; 2207 h->plt.refcount = 1; 2208 } 2209 } 2210 } 2211 else if (r_type != R_X86_64_PC32_BND 2212 && r_type != R_X86_64_PC64) 2213 { 2214 /* At run-time, R_X86_64_64 can be resolved for both 2215 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S 2216 can only be resolved for x32. Function pointer 2217 reference doesn't need PLT for pointer equality. */ 2218 if ((sec->flags & SEC_READONLY) == 0 2219 && (r_type == R_X86_64_64 2220 || (!ABI_64_P (abfd) 2221 && (r_type == R_X86_64_32 2222 || r_type == R_X86_64_32S)))) 2223 func_pointer_ref = true; 2224 2225 /* IFUNC symbol needs pointer equality in PDE so that 2226 function pointer reference will be resolved to its 2227 PLT entry directly. */ 2228 if (!func_pointer_ref 2229 || (bfd_link_pde (info) 2230 && h->type == STT_GNU_IFUNC)) 2231 h->pointer_equality_needed = 1; 2232 } 2233 2234 if (!func_pointer_ref) 2235 { 2236 /* If this reloc is in a read-only section, we might 2237 need a copy reloc. We can't check reliably at this 2238 stage whether the section is read-only, as input 2239 sections have not yet been mapped to output sections. 2240 Tentatively set the flag for now, and correct in 2241 adjust_dynamic_symbol. */ 2242 h->non_got_ref = 1; 2243 2244 if (!elf_has_indirect_extern_access (sec->owner)) 2245 eh->non_got_ref_without_indirect_extern_access = 1; 2246 2247 /* We may need a .plt entry if the symbol is a function 2248 defined in a shared lib or is a function referenced 2249 from the code or read-only section. */ 2250 if (!h->def_regular 2251 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0) 2252 h->plt.refcount = 1; 2253 2254 if (h->pointer_equality_needed 2255 && h->type == STT_FUNC 2256 && eh->def_protected 2257 && !SYMBOL_DEFINED_NON_SHARED_P (h) 2258 && h->def_dynamic) 2259 { 2260 /* Disallow non-canonical reference to canonical 2261 protected function. */ 2262 _bfd_error_handler 2263 /* xgettext:c-format */ 2264 (_("%pB: non-canonical reference to canonical " 2265 "protected function `%s' in %pB"), 2266 abfd, h->root.root.string, 2267 h->root.u.def.section->owner); 2268 bfd_set_error (bfd_error_bad_value); 2269 goto error_return; 2270 } 2271 } 2272 } 2273 2274 size_reloc = false; 2275 do_size: 2276 if (!no_dynreloc 2277 && NEED_DYNAMIC_RELOCATION_P (true, info, true, h, sec, 2278 r_type, 2279 htab->pointer_r_type)) 2280 { 2281 struct elf_dyn_relocs *p; 2282 struct elf_dyn_relocs **head; 2283 2284 /* If this is a global symbol, we count the number of 2285 relocations we need for this symbol. */ 2286 if (h != NULL) 2287 head = &h->dyn_relocs; 2288 else 2289 { 2290 /* Track dynamic relocs needed for local syms too. 2291 We really need local syms available to do this 2292 easily. Oh well. */ 2293 asection *s; 2294 void **vpp; 2295 2296 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, 2297 abfd, r_symndx); 2298 if (isym == NULL) 2299 goto error_return; 2300 2301 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 2302 if (s == NULL) 2303 s = sec; 2304 2305 /* Beware of type punned pointers vs strict aliasing 2306 rules. */ 2307 vpp = &(elf_section_data (s)->local_dynrel); 2308 head = (struct elf_dyn_relocs **)vpp; 2309 } 2310 2311 p = *head; 2312 if (p == NULL || p->sec != sec) 2313 { 2314 size_t amt = sizeof *p; 2315 2316 p = ((struct elf_dyn_relocs *) 2317 bfd_alloc (htab->elf.dynobj, amt)); 2318 if (p == NULL) 2319 goto error_return; 2320 p->next = *head; 2321 *head = p; 2322 p->sec = sec; 2323 p->count = 0; 2324 p->pc_count = 0; 2325 } 2326 2327 p->count += 1; 2328 /* Count size relocation as PC-relative relocation. */ 2329 if (X86_PCREL_TYPE_P (true, r_type) || size_reloc) 2330 p->pc_count += 1; 2331 } 2332 break; 2333 2334 /* This relocation describes the C++ object vtable hierarchy. 2335 Reconstruct it for later use during GC. */ 2336 case R_X86_64_GNU_VTINHERIT: 2337 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2338 goto error_return; 2339 break; 2340 2341 /* This relocation describes which C++ vtable entries are actually 2342 used. Record for later use during GC. */ 2343 case R_X86_64_GNU_VTENTRY: 2344 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2345 goto error_return; 2346 break; 2347 2348 default: 2349 break; 2350 } 2351 } 2352 2353 if (elf_section_data (sec)->this_hdr.contents != contents) 2354 { 2355 if (!converted && !_bfd_link_keep_memory (info)) 2356 free (contents); 2357 else 2358 { 2359 /* Cache the section contents for elf_link_input_bfd if any 2360 load is converted or --no-keep-memory isn't used. */ 2361 elf_section_data (sec)->this_hdr.contents = contents; 2362 info->cache_size += sec->size; 2363 } 2364 } 2365 2366 /* Cache relocations if any load is converted. */ 2367 if (elf_section_data (sec)->relocs != relocs && converted) 2368 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs; 2369 2370 return true; 2371 2372 error_return: 2373 if (elf_section_data (sec)->this_hdr.contents != contents) 2374 free (contents); 2375 sec->check_relocs_failed = 1; 2376 return false; 2377} 2378 2379static bool 2380elf_x86_64_always_size_sections (bfd *output_bfd, 2381 struct bfd_link_info *info) 2382{ 2383 bfd *abfd; 2384 2385 /* Scan relocations after rel_from_abs has been set on __ehdr_start. */ 2386 for (abfd = info->input_bfds; 2387 abfd != (bfd *) NULL; 2388 abfd = abfd->link.next) 2389 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour 2390 && !_bfd_elf_link_iterate_on_relocs (abfd, info, 2391 elf_x86_64_scan_relocs)) 2392 return false; 2393 2394 return _bfd_x86_elf_always_size_sections (output_bfd, info); 2395} 2396 2397/* Return the relocation value for @tpoff relocation 2398 if STT_TLS virtual address is ADDRESS. */ 2399 2400static bfd_vma 2401elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address) 2402{ 2403 struct elf_link_hash_table *htab = elf_hash_table (info); 2404 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); 2405 bfd_vma static_tls_size; 2406 2407 /* If tls_segment is NULL, we should have signalled an error already. */ 2408 if (htab->tls_sec == NULL) 2409 return 0; 2410 2411 /* Consider special static TLS alignment requirements. */ 2412 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); 2413 return address - static_tls_size - htab->tls_sec->vma; 2414} 2415 2416/* Relocate an x86_64 ELF section. */ 2417 2418static int 2419elf_x86_64_relocate_section (bfd *output_bfd, 2420 struct bfd_link_info *info, 2421 bfd *input_bfd, 2422 asection *input_section, 2423 bfd_byte *contents, 2424 Elf_Internal_Rela *relocs, 2425 Elf_Internal_Sym *local_syms, 2426 asection **local_sections) 2427{ 2428 struct elf_x86_link_hash_table *htab; 2429 Elf_Internal_Shdr *symtab_hdr; 2430 struct elf_link_hash_entry **sym_hashes; 2431 bfd_vma *local_got_offsets; 2432 bfd_vma *local_tlsdesc_gotents; 2433 Elf_Internal_Rela *rel; 2434 Elf_Internal_Rela *wrel; 2435 Elf_Internal_Rela *relend; 2436 unsigned int plt_entry_size; 2437 bool status; 2438 2439 /* Skip if check_relocs or scan_relocs failed. */ 2440 if (input_section->check_relocs_failed) 2441 return false; 2442 2443 htab = elf_x86_hash_table (info, X86_64_ELF_DATA); 2444 if (htab == NULL) 2445 return false; 2446 2447 if (!is_x86_elf (input_bfd, htab)) 2448 { 2449 bfd_set_error (bfd_error_wrong_format); 2450 return false; 2451 } 2452 2453 plt_entry_size = htab->plt.plt_entry_size; 2454 symtab_hdr = &elf_symtab_hdr (input_bfd); 2455 sym_hashes = elf_sym_hashes (input_bfd); 2456 local_got_offsets = elf_local_got_offsets (input_bfd); 2457 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd); 2458 2459 _bfd_x86_elf_set_tls_module_base (info); 2460 2461 status = true; 2462 rel = wrel = relocs; 2463 relend = relocs + input_section->reloc_count; 2464 for (; rel < relend; wrel++, rel++) 2465 { 2466 unsigned int r_type, r_type_tls; 2467 reloc_howto_type *howto; 2468 unsigned long r_symndx; 2469 struct elf_link_hash_entry *h; 2470 struct elf_x86_link_hash_entry *eh; 2471 Elf_Internal_Sym *sym; 2472 asection *sec; 2473 bfd_vma off, offplt, plt_offset; 2474 bfd_vma relocation; 2475 bool unresolved_reloc; 2476 bfd_reloc_status_type r; 2477 int tls_type; 2478 asection *base_got, *resolved_plt; 2479 bfd_vma st_size; 2480 bool resolved_to_zero; 2481 bool relative_reloc; 2482 bool converted_reloc; 2483 bool need_copy_reloc_in_pie; 2484 bool no_copyreloc_p; 2485 2486 r_type = ELF32_R_TYPE (rel->r_info); 2487 if (r_type == (int) R_X86_64_GNU_VTINHERIT 2488 || r_type == (int) R_X86_64_GNU_VTENTRY) 2489 { 2490 if (wrel != rel) 2491 *wrel = *rel; 2492 continue; 2493 } 2494 2495 r_symndx = htab->r_sym (rel->r_info); 2496 converted_reloc = (r_type & R_X86_64_converted_reloc_bit) != 0; 2497 if (converted_reloc) 2498 { 2499 r_type &= ~R_X86_64_converted_reloc_bit; 2500 rel->r_info = htab->r_info (r_symndx, r_type); 2501 } 2502 2503 howto = elf_x86_64_rtype_to_howto (input_bfd, r_type); 2504 if (howto == NULL) 2505 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type); 2506 2507 h = NULL; 2508 sym = NULL; 2509 sec = NULL; 2510 unresolved_reloc = false; 2511 if (r_symndx < symtab_hdr->sh_info) 2512 { 2513 sym = local_syms + r_symndx; 2514 sec = local_sections[r_symndx]; 2515 2516 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, 2517 &sec, rel); 2518 st_size = sym->st_size; 2519 2520 /* Relocate against local STT_GNU_IFUNC symbol. */ 2521 if (!bfd_link_relocatable (info) 2522 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 2523 { 2524 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, 2525 rel, false); 2526 if (h == NULL) 2527 abort (); 2528 2529 /* Set STT_GNU_IFUNC symbol value. */ 2530 h->root.u.def.value = sym->st_value; 2531 h->root.u.def.section = sec; 2532 } 2533 } 2534 else 2535 { 2536 bool warned ATTRIBUTE_UNUSED; 2537 bool ignored ATTRIBUTE_UNUSED; 2538 2539 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2540 r_symndx, symtab_hdr, sym_hashes, 2541 h, sec, relocation, 2542 unresolved_reloc, warned, ignored); 2543 st_size = h->size; 2544 } 2545 2546 if (sec != NULL && discarded_section (sec)) 2547 { 2548 _bfd_clear_contents (howto, input_bfd, input_section, 2549 contents, rel->r_offset); 2550 wrel->r_offset = rel->r_offset; 2551 wrel->r_info = 0; 2552 wrel->r_addend = 0; 2553 2554 /* For ld -r, remove relocations in debug sections against 2555 sections defined in discarded sections. Not done for 2556 eh_frame editing code expects to be present. */ 2557 if (bfd_link_relocatable (info) 2558 && (input_section->flags & SEC_DEBUGGING)) 2559 wrel--; 2560 2561 continue; 2562 } 2563 2564 if (bfd_link_relocatable (info)) 2565 { 2566 if (wrel != rel) 2567 *wrel = *rel; 2568 continue; 2569 } 2570 2571 if (rel->r_addend == 0 && !ABI_64_P (output_bfd)) 2572 { 2573 if (r_type == R_X86_64_64) 2574 { 2575 /* For x32, treat R_X86_64_64 like R_X86_64_32 and 2576 zero-extend it to 64bit if addend is zero. */ 2577 r_type = R_X86_64_32; 2578 memset (contents + rel->r_offset + 4, 0, 4); 2579 } 2580 else if (r_type == R_X86_64_SIZE64) 2581 { 2582 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and 2583 zero-extend it to 64bit if addend is zero. */ 2584 r_type = R_X86_64_SIZE32; 2585 memset (contents + rel->r_offset + 4, 0, 4); 2586 } 2587 } 2588 2589 eh = (struct elf_x86_link_hash_entry *) h; 2590 2591 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle 2592 it here if it is defined in a non-shared object. */ 2593 if (h != NULL 2594 && h->type == STT_GNU_IFUNC 2595 && h->def_regular) 2596 { 2597 bfd_vma plt_index; 2598 const char *name; 2599 2600 if ((input_section->flags & SEC_ALLOC) == 0) 2601 { 2602 /* If this is a SHT_NOTE section without SHF_ALLOC, treat 2603 STT_GNU_IFUNC symbol as STT_FUNC. */ 2604 if (elf_section_type (input_section) == SHT_NOTE) 2605 goto skip_ifunc; 2606 /* Dynamic relocs are not propagated for SEC_DEBUGGING 2607 sections because such sections are not SEC_ALLOC and 2608 thus ld.so will not process them. */ 2609 if ((input_section->flags & SEC_DEBUGGING) != 0) 2610 continue; 2611 abort (); 2612 } 2613 2614 switch (r_type) 2615 { 2616 default: 2617 break; 2618 2619 case R_X86_64_GOTPCREL: 2620 case R_X86_64_GOTPCRELX: 2621 case R_X86_64_REX_GOTPCRELX: 2622 case R_X86_64_GOTPCREL64: 2623 base_got = htab->elf.sgot; 2624 off = h->got.offset; 2625 2626 if (base_got == NULL) 2627 abort (); 2628 2629 if (off == (bfd_vma) -1) 2630 { 2631 /* We can't use h->got.offset here to save state, or 2632 even just remember the offset, as finish_dynamic_symbol 2633 would use that as offset into .got. */ 2634 2635 if (h->plt.offset == (bfd_vma) -1) 2636 abort (); 2637 2638 if (htab->elf.splt != NULL) 2639 { 2640 plt_index = (h->plt.offset / plt_entry_size 2641 - htab->plt.has_plt0); 2642 off = (plt_index + 3) * GOT_ENTRY_SIZE; 2643 base_got = htab->elf.sgotplt; 2644 } 2645 else 2646 { 2647 plt_index = h->plt.offset / plt_entry_size; 2648 off = plt_index * GOT_ENTRY_SIZE; 2649 base_got = htab->elf.igotplt; 2650 } 2651 2652 if (h->dynindx == -1 2653 || h->forced_local 2654 || info->symbolic) 2655 { 2656 /* This references the local defitionion. We must 2657 initialize this entry in the global offset table. 2658 Since the offset must always be a multiple of 8, 2659 we use the least significant bit to record 2660 whether we have initialized it already. 2661 2662 When doing a dynamic link, we create a .rela.got 2663 relocation entry to initialize the value. This 2664 is done in the finish_dynamic_symbol routine. */ 2665 if ((off & 1) != 0) 2666 off &= ~1; 2667 else 2668 { 2669 bfd_put_64 (output_bfd, relocation, 2670 base_got->contents + off); 2671 /* Note that this is harmless for the GOTPLT64 2672 case, as -1 | 1 still is -1. */ 2673 h->got.offset |= 1; 2674 } 2675 } 2676 } 2677 2678 relocation = (base_got->output_section->vma 2679 + base_got->output_offset + off); 2680 2681 goto do_relocation; 2682 } 2683 2684 if (h->plt.offset == (bfd_vma) -1) 2685 { 2686 /* Handle static pointers of STT_GNU_IFUNC symbols. */ 2687 if (r_type == htab->pointer_r_type 2688 && (input_section->flags & SEC_CODE) == 0) 2689 goto do_ifunc_pointer; 2690 goto bad_ifunc_reloc; 2691 } 2692 2693 /* STT_GNU_IFUNC symbol must go through PLT. */ 2694 if (htab->elf.splt != NULL) 2695 { 2696 if (htab->plt_second != NULL) 2697 { 2698 resolved_plt = htab->plt_second; 2699 plt_offset = eh->plt_second.offset; 2700 } 2701 else 2702 { 2703 resolved_plt = htab->elf.splt; 2704 plt_offset = h->plt.offset; 2705 } 2706 } 2707 else 2708 { 2709 resolved_plt = htab->elf.iplt; 2710 plt_offset = h->plt.offset; 2711 } 2712 2713 relocation = (resolved_plt->output_section->vma 2714 + resolved_plt->output_offset + plt_offset); 2715 2716 switch (r_type) 2717 { 2718 default: 2719 bad_ifunc_reloc: 2720 if (h->root.root.string) 2721 name = h->root.root.string; 2722 else 2723 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, 2724 NULL); 2725 _bfd_error_handler 2726 /* xgettext:c-format */ 2727 (_("%pB: relocation %s against STT_GNU_IFUNC " 2728 "symbol `%s' isn't supported"), input_bfd, 2729 howto->name, name); 2730 bfd_set_error (bfd_error_bad_value); 2731 return false; 2732 2733 case R_X86_64_32S: 2734 if (bfd_link_pic (info)) 2735 abort (); 2736 goto do_relocation; 2737 2738 case R_X86_64_32: 2739 if (ABI_64_P (output_bfd)) 2740 goto do_relocation; 2741 /* FALLTHROUGH */ 2742 case R_X86_64_64: 2743 do_ifunc_pointer: 2744 if (rel->r_addend != 0) 2745 { 2746 if (h->root.root.string) 2747 name = h->root.root.string; 2748 else 2749 name = bfd_elf_sym_name (input_bfd, symtab_hdr, 2750 sym, NULL); 2751 _bfd_error_handler 2752 /* xgettext:c-format */ 2753 (_("%pB: relocation %s against STT_GNU_IFUNC " 2754 "symbol `%s' has non-zero addend: %" PRId64), 2755 input_bfd, howto->name, name, (int64_t) rel->r_addend); 2756 bfd_set_error (bfd_error_bad_value); 2757 return false; 2758 } 2759 2760 /* Generate dynamic relcoation only when there is a 2761 non-GOT reference in a shared object or there is no 2762 PLT. */ 2763 if ((bfd_link_pic (info) && h->non_got_ref) 2764 || h->plt.offset == (bfd_vma) -1) 2765 { 2766 Elf_Internal_Rela outrel; 2767 asection *sreloc; 2768 2769 /* Need a dynamic relocation to get the real function 2770 address. */ 2771 outrel.r_offset = _bfd_elf_section_offset (output_bfd, 2772 info, 2773 input_section, 2774 rel->r_offset); 2775 if (outrel.r_offset == (bfd_vma) -1 2776 || outrel.r_offset == (bfd_vma) -2) 2777 abort (); 2778 2779 outrel.r_offset += (input_section->output_section->vma 2780 + input_section->output_offset); 2781 2782 if (POINTER_LOCAL_IFUNC_P (info, h)) 2783 { 2784 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 2785 h->root.root.string, 2786 h->root.u.def.section->owner); 2787 2788 /* This symbol is resolved locally. */ 2789 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE); 2790 outrel.r_addend = (h->root.u.def.value 2791 + h->root.u.def.section->output_section->vma 2792 + h->root.u.def.section->output_offset); 2793 2794 if (htab->params->report_relative_reloc) 2795 _bfd_x86_elf_link_report_relative_reloc 2796 (info, input_section, h, sym, 2797 "R_X86_64_IRELATIVE", &outrel); 2798 } 2799 else 2800 { 2801 outrel.r_info = htab->r_info (h->dynindx, r_type); 2802 outrel.r_addend = 0; 2803 } 2804 2805 /* Dynamic relocations are stored in 2806 1. .rela.ifunc section in PIC object. 2807 2. .rela.got section in dynamic executable. 2808 3. .rela.iplt section in static executable. */ 2809 if (bfd_link_pic (info)) 2810 sreloc = htab->elf.irelifunc; 2811 else if (htab->elf.splt != NULL) 2812 sreloc = htab->elf.srelgot; 2813 else 2814 sreloc = htab->elf.irelplt; 2815 elf_append_rela (output_bfd, sreloc, &outrel); 2816 2817 /* If this reloc is against an external symbol, we 2818 do not want to fiddle with the addend. Otherwise, 2819 we need to include the symbol value so that it 2820 becomes an addend for the dynamic reloc. For an 2821 internal symbol, we have updated addend. */ 2822 continue; 2823 } 2824 /* FALLTHROUGH */ 2825 case R_X86_64_PC32: 2826 case R_X86_64_PC32_BND: 2827 case R_X86_64_PC64: 2828 case R_X86_64_PLT32: 2829 case R_X86_64_PLT32_BND: 2830 goto do_relocation; 2831 } 2832 } 2833 2834 skip_ifunc: 2835 resolved_to_zero = (eh != NULL 2836 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh)); 2837 2838 /* When generating a shared object, the relocations handled here are 2839 copied into the output file to be resolved at run time. */ 2840 switch (r_type) 2841 { 2842 case R_X86_64_GOT32: 2843 case R_X86_64_GOT64: 2844 /* Relocation is to the entry for this symbol in the global 2845 offset table. */ 2846 case R_X86_64_GOTPCREL: 2847 case R_X86_64_GOTPCRELX: 2848 case R_X86_64_REX_GOTPCRELX: 2849 case R_X86_64_GOTPCREL64: 2850 /* Use global offset table entry as symbol value. */ 2851 case R_X86_64_GOTPLT64: 2852 /* This is obsolete and treated the same as GOT64. */ 2853 base_got = htab->elf.sgot; 2854 2855 if (htab->elf.sgot == NULL) 2856 abort (); 2857 2858 relative_reloc = false; 2859 if (h != NULL) 2860 { 2861 off = h->got.offset; 2862 if (h->needs_plt 2863 && h->plt.offset != (bfd_vma)-1 2864 && off == (bfd_vma)-1) 2865 { 2866 /* We can't use h->got.offset here to save 2867 state, or even just remember the offset, as 2868 finish_dynamic_symbol would use that as offset into 2869 .got. */ 2870 bfd_vma plt_index = (h->plt.offset / plt_entry_size 2871 - htab->plt.has_plt0); 2872 off = (plt_index + 3) * GOT_ENTRY_SIZE; 2873 base_got = htab->elf.sgotplt; 2874 } 2875 2876 if (RESOLVED_LOCALLY_P (info, h, htab)) 2877 { 2878 /* We must initialize this entry in the global offset 2879 table. Since the offset must always be a multiple 2880 of 8, we use the least significant bit to record 2881 whether we have initialized it already. 2882 2883 When doing a dynamic link, we create a .rela.got 2884 relocation entry to initialize the value. This is 2885 done in the finish_dynamic_symbol routine. */ 2886 if ((off & 1) != 0) 2887 off &= ~1; 2888 else 2889 { 2890 bfd_put_64 (output_bfd, relocation, 2891 base_got->contents + off); 2892 /* Note that this is harmless for the GOTPLT64 case, 2893 as -1 | 1 still is -1. */ 2894 h->got.offset |= 1; 2895 2896 /* NB: Don't generate relative relocation here if 2897 it has been generated by DT_RELR. */ 2898 if (!info->enable_dt_relr 2899 && GENERATE_RELATIVE_RELOC_P (info, h)) 2900 { 2901 /* If this symbol isn't dynamic in PIC, 2902 generate R_X86_64_RELATIVE here. */ 2903 eh->no_finish_dynamic_symbol = 1; 2904 relative_reloc = true; 2905 } 2906 } 2907 } 2908 else 2909 unresolved_reloc = false; 2910 } 2911 else 2912 { 2913 if (local_got_offsets == NULL) 2914 abort (); 2915 2916 off = local_got_offsets[r_symndx]; 2917 2918 /* The offset must always be a multiple of 8. We use 2919 the least significant bit to record whether we have 2920 already generated the necessary reloc. */ 2921 if ((off & 1) != 0) 2922 off &= ~1; 2923 else 2924 { 2925 bfd_put_64 (output_bfd, relocation, 2926 base_got->contents + off); 2927 local_got_offsets[r_symndx] |= 1; 2928 2929 /* NB: GOTPCREL relocations against local absolute 2930 symbol store relocation value in the GOT slot 2931 without relative relocation. Don't generate 2932 relative relocation here if it has been generated 2933 by DT_RELR. */ 2934 if (!info->enable_dt_relr 2935 && bfd_link_pic (info) 2936 && !(sym->st_shndx == SHN_ABS 2937 && (r_type == R_X86_64_GOTPCREL 2938 || r_type == R_X86_64_GOTPCRELX 2939 || r_type == R_X86_64_REX_GOTPCRELX))) 2940 relative_reloc = true; 2941 } 2942 } 2943 2944 if (relative_reloc) 2945 { 2946 asection *s; 2947 Elf_Internal_Rela outrel; 2948 2949 /* We need to generate a R_X86_64_RELATIVE reloc 2950 for the dynamic linker. */ 2951 s = htab->elf.srelgot; 2952 if (s == NULL) 2953 abort (); 2954 2955 outrel.r_offset = (base_got->output_section->vma 2956 + base_got->output_offset 2957 + off); 2958 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE); 2959 outrel.r_addend = relocation; 2960 2961 if (htab->params->report_relative_reloc) 2962 _bfd_x86_elf_link_report_relative_reloc 2963 (info, input_section, h, sym, "R_X86_64_RELATIVE", 2964 &outrel); 2965 2966 elf_append_rela (output_bfd, s, &outrel); 2967 } 2968 2969 if (off >= (bfd_vma) -2) 2970 abort (); 2971 2972 relocation = base_got->output_section->vma 2973 + base_got->output_offset + off; 2974 if (r_type != R_X86_64_GOTPCREL 2975 && r_type != R_X86_64_GOTPCRELX 2976 && r_type != R_X86_64_REX_GOTPCRELX 2977 && r_type != R_X86_64_GOTPCREL64) 2978 relocation -= htab->elf.sgotplt->output_section->vma 2979 - htab->elf.sgotplt->output_offset; 2980 2981 break; 2982 2983 case R_X86_64_GOTOFF64: 2984 /* Relocation is relative to the start of the global offset 2985 table. */ 2986 2987 /* Check to make sure it isn't a protected function or data 2988 symbol for shared library since it may not be local when 2989 used as function address or with copy relocation. We also 2990 need to make sure that a symbol is referenced locally. */ 2991 if (bfd_link_pic (info) && h) 2992 { 2993 if (!h->def_regular) 2994 { 2995 const char *v; 2996 2997 switch (ELF_ST_VISIBILITY (h->other)) 2998 { 2999 case STV_HIDDEN: 3000 v = _("hidden symbol"); 3001 break; 3002 case STV_INTERNAL: 3003 v = _("internal symbol"); 3004 break; 3005 case STV_PROTECTED: 3006 v = _("protected symbol"); 3007 break; 3008 default: 3009 v = _("symbol"); 3010 break; 3011 } 3012 3013 _bfd_error_handler 3014 /* xgettext:c-format */ 3015 (_("%pB: relocation R_X86_64_GOTOFF64 against undefined %s" 3016 " `%s' can not be used when making a shared object"), 3017 input_bfd, v, h->root.root.string); 3018 bfd_set_error (bfd_error_bad_value); 3019 return false; 3020 } 3021 else if (!bfd_link_executable (info) 3022 && !SYMBOL_REFERENCES_LOCAL_P (info, h) 3023 && (h->type == STT_FUNC 3024 || h->type == STT_OBJECT) 3025 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) 3026 { 3027 _bfd_error_handler 3028 /* xgettext:c-format */ 3029 (_("%pB: relocation R_X86_64_GOTOFF64 against protected %s" 3030 " `%s' can not be used when making a shared object"), 3031 input_bfd, 3032 h->type == STT_FUNC ? "function" : "data", 3033 h->root.root.string); 3034 bfd_set_error (bfd_error_bad_value); 3035 return false; 3036 } 3037 } 3038 3039 /* Note that sgot is not involved in this 3040 calculation. We always want the start of .got.plt. If we 3041 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is 3042 permitted by the ABI, we might have to change this 3043 calculation. */ 3044 relocation -= htab->elf.sgotplt->output_section->vma 3045 + htab->elf.sgotplt->output_offset; 3046 break; 3047 3048 case R_X86_64_GOTPC32: 3049 case R_X86_64_GOTPC64: 3050 /* Use global offset table as symbol value. */ 3051 relocation = htab->elf.sgotplt->output_section->vma 3052 + htab->elf.sgotplt->output_offset; 3053 unresolved_reloc = false; 3054 break; 3055 3056 case R_X86_64_PLTOFF64: 3057 /* Relocation is PLT entry relative to GOT. For local 3058 symbols it's the symbol itself relative to GOT. */ 3059 if (h != NULL 3060 /* See PLT32 handling. */ 3061 && (h->plt.offset != (bfd_vma) -1 3062 || eh->plt_got.offset != (bfd_vma) -1) 3063 && htab->elf.splt != NULL) 3064 { 3065 if (eh->plt_got.offset != (bfd_vma) -1) 3066 { 3067 /* Use the GOT PLT. */ 3068 resolved_plt = htab->plt_got; 3069 plt_offset = eh->plt_got.offset; 3070 } 3071 else if (htab->plt_second != NULL) 3072 { 3073 resolved_plt = htab->plt_second; 3074 plt_offset = eh->plt_second.offset; 3075 } 3076 else 3077 { 3078 resolved_plt = htab->elf.splt; 3079 plt_offset = h->plt.offset; 3080 } 3081 3082 relocation = (resolved_plt->output_section->vma 3083 + resolved_plt->output_offset 3084 + plt_offset); 3085 unresolved_reloc = false; 3086 } 3087 3088 relocation -= htab->elf.sgotplt->output_section->vma 3089 + htab->elf.sgotplt->output_offset; 3090 break; 3091 3092 case R_X86_64_PLT32: 3093 case R_X86_64_PLT32_BND: 3094 /* Relocation is to the entry for this symbol in the 3095 procedure linkage table. */ 3096 3097 /* Resolve a PLT32 reloc against a local symbol directly, 3098 without using the procedure linkage table. */ 3099 if (h == NULL) 3100 break; 3101 3102 if ((h->plt.offset == (bfd_vma) -1 3103 && eh->plt_got.offset == (bfd_vma) -1) 3104 || htab->elf.splt == NULL) 3105 { 3106 /* We didn't make a PLT entry for this symbol. This 3107 happens when statically linking PIC code, or when 3108 using -Bsymbolic. */ 3109 break; 3110 } 3111 3112 use_plt: 3113 if (h->plt.offset != (bfd_vma) -1) 3114 { 3115 if (htab->plt_second != NULL) 3116 { 3117 resolved_plt = htab->plt_second; 3118 plt_offset = eh->plt_second.offset; 3119 } 3120 else 3121 { 3122 resolved_plt = htab->elf.splt; 3123 plt_offset = h->plt.offset; 3124 } 3125 } 3126 else 3127 { 3128 /* Use the GOT PLT. */ 3129 resolved_plt = htab->plt_got; 3130 plt_offset = eh->plt_got.offset; 3131 } 3132 3133 relocation = (resolved_plt->output_section->vma 3134 + resolved_plt->output_offset 3135 + plt_offset); 3136 unresolved_reloc = false; 3137 break; 3138 3139 case R_X86_64_SIZE32: 3140 case R_X86_64_SIZE64: 3141 /* Set to symbol size. */ 3142 relocation = st_size; 3143 goto direct; 3144 3145 case R_X86_64_PC8: 3146 case R_X86_64_PC16: 3147 case R_X86_64_PC32: 3148 case R_X86_64_PC32_BND: 3149 /* Don't complain about -fPIC if the symbol is undefined when 3150 building executable unless it is unresolved weak symbol, 3151 references a dynamic definition in PIE or -z nocopyreloc 3152 is used. */ 3153 no_copyreloc_p 3154 = (info->nocopyreloc 3155 || (h != NULL 3156 && !h->root.linker_def 3157 && !h->root.ldscript_def 3158 && eh->def_protected)); 3159 3160 if ((input_section->flags & SEC_ALLOC) != 0 3161 && (input_section->flags & SEC_READONLY) != 0 3162 && h != NULL 3163 && ((bfd_link_executable (info) 3164 && ((h->root.type == bfd_link_hash_undefweak 3165 && (eh == NULL 3166 || !UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, 3167 eh))) 3168 || (bfd_link_pie (info) 3169 && !SYMBOL_DEFINED_NON_SHARED_P (h) 3170 && h->def_dynamic) 3171 || (no_copyreloc_p 3172 && h->def_dynamic 3173 && !(h->root.u.def.section->flags & SEC_CODE)))) 3174 || (bfd_link_pie (info) 3175 && h->root.type == bfd_link_hash_undefweak) 3176 || bfd_link_dll (info))) 3177 { 3178 bool fail = false; 3179 if (SYMBOL_REFERENCES_LOCAL_P (info, h)) 3180 { 3181 /* Symbol is referenced locally. Make sure it is 3182 defined locally. */ 3183 fail = !SYMBOL_DEFINED_NON_SHARED_P (h); 3184 } 3185 else if (bfd_link_pie (info)) 3186 { 3187 /* We can only use PC-relative relocations in PIE 3188 from non-code sections. */ 3189 if (h->root.type == bfd_link_hash_undefweak 3190 || (h->type == STT_FUNC 3191 && (sec->flags & SEC_CODE) != 0)) 3192 fail = true; 3193 } 3194 else if (no_copyreloc_p || bfd_link_dll (info)) 3195 { 3196 /* Symbol doesn't need copy reloc and isn't 3197 referenced locally. Don't allow PC-relative 3198 relocations against default and protected 3199 symbols since address of protected function 3200 and location of protected data may not be in 3201 the shared object. */ 3202 fail = (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 3203 || ELF_ST_VISIBILITY (h->other) == STV_PROTECTED); 3204 } 3205 3206 if (fail) 3207 return elf_x86_64_need_pic (info, input_bfd, input_section, 3208 h, NULL, NULL, howto); 3209 } 3210 /* Since x86-64 has PC-relative PLT, we can use PLT in PIE 3211 as function address. */ 3212 else if (h != NULL 3213 && (input_section->flags & SEC_CODE) == 0 3214 && bfd_link_pie (info) 3215 && h->type == STT_FUNC 3216 && !h->def_regular 3217 && h->def_dynamic) 3218 goto use_plt; 3219 /* Fall through. */ 3220 3221 case R_X86_64_8: 3222 case R_X86_64_16: 3223 case R_X86_64_32: 3224 case R_X86_64_PC64: 3225 case R_X86_64_64: 3226 /* FIXME: The ABI says the linker should make sure the value is 3227 the same when it's zeroextended to 64 bit. */ 3228 3229 direct: 3230 if ((input_section->flags & SEC_ALLOC) == 0) 3231 break; 3232 3233 need_copy_reloc_in_pie = (bfd_link_pie (info) 3234 && h != NULL 3235 && (h->needs_copy 3236 || eh->needs_copy 3237 || (h->root.type 3238 == bfd_link_hash_undefined)) 3239 && (X86_PCREL_TYPE_P (true, r_type) 3240 || X86_SIZE_TYPE_P (true, 3241 r_type))); 3242 3243 if (GENERATE_DYNAMIC_RELOCATION_P (true, info, eh, r_type, sec, 3244 need_copy_reloc_in_pie, 3245 resolved_to_zero, false)) 3246 { 3247 Elf_Internal_Rela outrel; 3248 bool skip, relocate; 3249 bool generate_dynamic_reloc = true; 3250 asection *sreloc; 3251 const char *relative_reloc_name = NULL; 3252 3253 /* When generating a shared object, these relocations 3254 are copied into the output file to be resolved at run 3255 time. */ 3256 skip = false; 3257 relocate = false; 3258 3259 outrel.r_offset = 3260 _bfd_elf_section_offset (output_bfd, info, input_section, 3261 rel->r_offset); 3262 if (outrel.r_offset == (bfd_vma) -1) 3263 skip = true; 3264 else if (outrel.r_offset == (bfd_vma) -2) 3265 skip = true, relocate = true; 3266 3267 outrel.r_offset += (input_section->output_section->vma 3268 + input_section->output_offset); 3269 3270 if (skip) 3271 memset (&outrel, 0, sizeof outrel); 3272 3273 else if (COPY_INPUT_RELOC_P (true, info, h, r_type)) 3274 { 3275 outrel.r_info = htab->r_info (h->dynindx, r_type); 3276 outrel.r_addend = rel->r_addend; 3277 } 3278 else 3279 { 3280 /* This symbol is local, or marked to become local. 3281 When relocation overflow check is disabled, we 3282 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */ 3283 if (r_type == htab->pointer_r_type 3284 || (r_type == R_X86_64_32 3285 && htab->params->no_reloc_overflow_check)) 3286 { 3287 relocate = true; 3288 /* NB: Don't generate relative relocation here if 3289 it has been generated by DT_RELR. */ 3290 if (info->enable_dt_relr) 3291 generate_dynamic_reloc = false; 3292 else 3293 { 3294 outrel.r_info = 3295 htab->r_info (0, R_X86_64_RELATIVE); 3296 outrel.r_addend = relocation + rel->r_addend; 3297 relative_reloc_name = "R_X86_64_RELATIVE"; 3298 } 3299 } 3300 else if (r_type == R_X86_64_64 3301 && !ABI_64_P (output_bfd)) 3302 { 3303 relocate = true; 3304 outrel.r_info = htab->r_info (0, 3305 R_X86_64_RELATIVE64); 3306 outrel.r_addend = relocation + rel->r_addend; 3307 relative_reloc_name = "R_X86_64_RELATIVE64"; 3308 /* Check addend overflow. */ 3309 if ((outrel.r_addend & 0x80000000) 3310 != (rel->r_addend & 0x80000000)) 3311 { 3312 const char *name; 3313 int addend = rel->r_addend; 3314 if (h && h->root.root.string) 3315 name = h->root.root.string; 3316 else 3317 name = bfd_elf_sym_name (input_bfd, symtab_hdr, 3318 sym, NULL); 3319 _bfd_error_handler 3320 /* xgettext:c-format */ 3321 (_("%pB: addend %s%#x in relocation %s against " 3322 "symbol `%s' at %#" PRIx64 3323 " in section `%pA' is out of range"), 3324 input_bfd, addend < 0 ? "-" : "", addend, 3325 howto->name, name, (uint64_t) rel->r_offset, 3326 input_section); 3327 bfd_set_error (bfd_error_bad_value); 3328 return false; 3329 } 3330 } 3331 else 3332 { 3333 long sindx; 3334 3335 if (bfd_is_abs_section (sec)) 3336 sindx = 0; 3337 else if (sec == NULL || sec->owner == NULL) 3338 { 3339 bfd_set_error (bfd_error_bad_value); 3340 return false; 3341 } 3342 else 3343 { 3344 asection *osec; 3345 3346 /* We are turning this relocation into one 3347 against a section symbol. It would be 3348 proper to subtract the symbol's value, 3349 osec->vma, from the emitted reloc addend, 3350 but ld.so expects buggy relocs. */ 3351 osec = sec->output_section; 3352 sindx = elf_section_data (osec)->dynindx; 3353 if (sindx == 0) 3354 { 3355 asection *oi = htab->elf.text_index_section; 3356 sindx = elf_section_data (oi)->dynindx; 3357 } 3358 BFD_ASSERT (sindx != 0); 3359 } 3360 3361 outrel.r_info = htab->r_info (sindx, r_type); 3362 outrel.r_addend = relocation + rel->r_addend; 3363 } 3364 } 3365 3366 if (generate_dynamic_reloc) 3367 { 3368 sreloc = elf_section_data (input_section)->sreloc; 3369 3370 if (sreloc == NULL || sreloc->contents == NULL) 3371 { 3372 r = bfd_reloc_notsupported; 3373 goto check_relocation_error; 3374 } 3375 3376 if (relative_reloc_name 3377 && htab->params->report_relative_reloc) 3378 _bfd_x86_elf_link_report_relative_reloc 3379 (info, input_section, h, sym, 3380 relative_reloc_name, &outrel); 3381 3382 elf_append_rela (output_bfd, sreloc, &outrel); 3383 } 3384 3385 /* If this reloc is against an external symbol, we do 3386 not want to fiddle with the addend. Otherwise, we 3387 need to include the symbol value so that it becomes 3388 an addend for the dynamic reloc. */ 3389 if (! relocate) 3390 continue; 3391 } 3392 3393 break; 3394 3395 case R_X86_64_TLSGD: 3396 case R_X86_64_GOTPC32_TLSDESC: 3397 case R_X86_64_TLSDESC_CALL: 3398 case R_X86_64_GOTTPOFF: 3399 tls_type = GOT_UNKNOWN; 3400 if (h == NULL && local_got_offsets) 3401 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx]; 3402 else if (h != NULL) 3403 tls_type = elf_x86_hash_entry (h)->tls_type; 3404 3405 r_type_tls = r_type; 3406 if (! elf_x86_64_tls_transition (info, input_bfd, 3407 input_section, contents, 3408 symtab_hdr, sym_hashes, 3409 &r_type_tls, tls_type, rel, 3410 relend, h, r_symndx, true)) 3411 return false; 3412 3413 if (r_type_tls == R_X86_64_TPOFF32) 3414 { 3415 bfd_vma roff = rel->r_offset; 3416 3417 BFD_ASSERT (! unresolved_reloc); 3418 3419 if (r_type == R_X86_64_TLSGD) 3420 { 3421 /* GD->LE transition. For 64bit, change 3422 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 3423 .word 0x6666; rex64; call __tls_get_addr@PLT 3424 or 3425 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 3426 .byte 0x66; rex64 3427 call *__tls_get_addr@GOTPCREL(%rip) 3428 which may be converted to 3429 addr32 call __tls_get_addr 3430 into: 3431 movq %fs:0, %rax 3432 leaq foo@tpoff(%rax), %rax 3433 For 32bit, change 3434 leaq foo@tlsgd(%rip), %rdi 3435 .word 0x6666; rex64; call __tls_get_addr@PLT 3436 or 3437 leaq foo@tlsgd(%rip), %rdi 3438 .byte 0x66; rex64 3439 call *__tls_get_addr@GOTPCREL(%rip) 3440 which may be converted to 3441 addr32 call __tls_get_addr 3442 into: 3443 movl %fs:0, %eax 3444 leaq foo@tpoff(%rax), %rax 3445 For largepic, change: 3446 leaq foo@tlsgd(%rip), %rdi 3447 movabsq $__tls_get_addr@pltoff, %rax 3448 addq %r15, %rax 3449 call *%rax 3450 into: 3451 movq %fs:0, %rax 3452 leaq foo@tpoff(%rax), %rax 3453 nopw 0x0(%rax,%rax,1) */ 3454 int largepic = 0; 3455 if (ABI_64_P (output_bfd)) 3456 { 3457 if (contents[roff + 5] == 0xb8) 3458 { 3459 if (roff < 3 3460 || (roff - 3 + 22) > input_section->size) 3461 { 3462 corrupt_input: 3463 info->callbacks->einfo 3464 (_("%F%P: corrupt input: %pB\n"), 3465 input_bfd); 3466 return false; 3467 } 3468 memcpy (contents + roff - 3, 3469 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80" 3470 "\0\0\0\0\x66\x0f\x1f\x44\0", 22); 3471 largepic = 1; 3472 } 3473 else 3474 { 3475 if (roff < 4 3476 || (roff - 4 + 16) > input_section->size) 3477 goto corrupt_input; 3478 memcpy (contents + roff - 4, 3479 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", 3480 16); 3481 } 3482 } 3483 else 3484 { 3485 if (roff < 3 3486 || (roff - 3 + 15) > input_section->size) 3487 goto corrupt_input; 3488 memcpy (contents + roff - 3, 3489 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", 3490 15); 3491 } 3492 bfd_put_32 (output_bfd, 3493 elf_x86_64_tpoff (info, relocation), 3494 contents + roff + 8 + largepic); 3495 /* Skip R_X86_64_PC32, R_X86_64_PLT32, 3496 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */ 3497 rel++; 3498 wrel++; 3499 continue; 3500 } 3501 else if (r_type == R_X86_64_GOTPC32_TLSDESC) 3502 { 3503 /* GDesc -> LE transition. 3504 It's originally something like: 3505 leaq x@tlsdesc(%rip), %rax <--- LP64 mode. 3506 rex leal x@tlsdesc(%rip), %eax <--- X32 mode. 3507 3508 Change it to: 3509 movq $x@tpoff, %rax <--- LP64 mode. 3510 rex movl $x@tpoff, %eax <--- X32 mode. 3511 */ 3512 3513 unsigned int val, type; 3514 3515 if (roff < 3) 3516 goto corrupt_input; 3517 type = bfd_get_8 (input_bfd, contents + roff - 3); 3518 val = bfd_get_8 (input_bfd, contents + roff - 1); 3519 bfd_put_8 (output_bfd, 3520 (type & 0x48) | ((type >> 2) & 1), 3521 contents + roff - 3); 3522 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2); 3523 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 3524 contents + roff - 1); 3525 bfd_put_32 (output_bfd, 3526 elf_x86_64_tpoff (info, relocation), 3527 contents + roff); 3528 continue; 3529 } 3530 else if (r_type == R_X86_64_TLSDESC_CALL) 3531 { 3532 /* GDesc -> LE transition. 3533 It's originally: 3534 call *(%rax) <--- LP64 mode. 3535 call *(%eax) <--- X32 mode. 3536 Turn it into: 3537 xchg %ax,%ax <-- LP64 mode. 3538 nopl (%rax) <-- X32 mode. 3539 */ 3540 unsigned int prefix = 0; 3541 if (!ABI_64_P (input_bfd)) 3542 { 3543 /* Check for call *x@tlsdesc(%eax). */ 3544 if (contents[roff] == 0x67) 3545 prefix = 1; 3546 } 3547 if (prefix) 3548 { 3549 bfd_put_8 (output_bfd, 0x0f, contents + roff); 3550 bfd_put_8 (output_bfd, 0x1f, contents + roff + 1); 3551 bfd_put_8 (output_bfd, 0x00, contents + roff + 2); 3552 } 3553 else 3554 { 3555 bfd_put_8 (output_bfd, 0x66, contents + roff); 3556 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 3557 } 3558 continue; 3559 } 3560 else if (r_type == R_X86_64_GOTTPOFF) 3561 { 3562 /* IE->LE transition: 3563 For 64bit, originally it can be one of: 3564 movq foo@gottpoff(%rip), %reg 3565 addq foo@gottpoff(%rip), %reg 3566 We change it into: 3567 movq $foo, %reg 3568 leaq foo(%reg), %reg 3569 addq $foo, %reg. 3570 For 32bit, originally it can be one of: 3571 movq foo@gottpoff(%rip), %reg 3572 addl foo@gottpoff(%rip), %reg 3573 We change it into: 3574 movq $foo, %reg 3575 leal foo(%reg), %reg 3576 addl $foo, %reg. */ 3577 3578 unsigned int val, type, reg; 3579 3580 if (roff >= 3) 3581 val = bfd_get_8 (input_bfd, contents + roff - 3); 3582 else 3583 { 3584 if (roff < 2) 3585 goto corrupt_input; 3586 val = 0; 3587 } 3588 type = bfd_get_8 (input_bfd, contents + roff - 2); 3589 reg = bfd_get_8 (input_bfd, contents + roff - 1); 3590 reg >>= 3; 3591 if (type == 0x8b) 3592 { 3593 /* movq */ 3594 if (val == 0x4c) 3595 { 3596 if (roff < 3) 3597 goto corrupt_input; 3598 bfd_put_8 (output_bfd, 0x49, 3599 contents + roff - 3); 3600 } 3601 else if (!ABI_64_P (output_bfd) && val == 0x44) 3602 { 3603 if (roff < 3) 3604 goto corrupt_input; 3605 bfd_put_8 (output_bfd, 0x41, 3606 contents + roff - 3); 3607 } 3608 bfd_put_8 (output_bfd, 0xc7, 3609 contents + roff - 2); 3610 bfd_put_8 (output_bfd, 0xc0 | reg, 3611 contents + roff - 1); 3612 } 3613 else if (reg == 4) 3614 { 3615 /* addq/addl -> addq/addl - addressing with %rsp/%r12 3616 is special */ 3617 if (val == 0x4c) 3618 { 3619 if (roff < 3) 3620 goto corrupt_input; 3621 bfd_put_8 (output_bfd, 0x49, 3622 contents + roff - 3); 3623 } 3624 else if (!ABI_64_P (output_bfd) && val == 0x44) 3625 { 3626 if (roff < 3) 3627 goto corrupt_input; 3628 bfd_put_8 (output_bfd, 0x41, 3629 contents + roff - 3); 3630 } 3631 bfd_put_8 (output_bfd, 0x81, 3632 contents + roff - 2); 3633 bfd_put_8 (output_bfd, 0xc0 | reg, 3634 contents + roff - 1); 3635 } 3636 else 3637 { 3638 /* addq/addl -> leaq/leal */ 3639 if (val == 0x4c) 3640 { 3641 if (roff < 3) 3642 goto corrupt_input; 3643 bfd_put_8 (output_bfd, 0x4d, 3644 contents + roff - 3); 3645 } 3646 else if (!ABI_64_P (output_bfd) && val == 0x44) 3647 { 3648 if (roff < 3) 3649 goto corrupt_input; 3650 bfd_put_8 (output_bfd, 0x45, 3651 contents + roff - 3); 3652 } 3653 bfd_put_8 (output_bfd, 0x8d, 3654 contents + roff - 2); 3655 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), 3656 contents + roff - 1); 3657 } 3658 bfd_put_32 (output_bfd, 3659 elf_x86_64_tpoff (info, relocation), 3660 contents + roff); 3661 continue; 3662 } 3663 else 3664 BFD_ASSERT (false); 3665 } 3666 3667 if (htab->elf.sgot == NULL) 3668 abort (); 3669 3670 if (h != NULL) 3671 { 3672 off = h->got.offset; 3673 offplt = elf_x86_hash_entry (h)->tlsdesc_got; 3674 } 3675 else 3676 { 3677 if (local_got_offsets == NULL) 3678 abort (); 3679 3680 off = local_got_offsets[r_symndx]; 3681 offplt = local_tlsdesc_gotents[r_symndx]; 3682 } 3683 3684 if ((off & 1) != 0) 3685 off &= ~1; 3686 else 3687 { 3688 Elf_Internal_Rela outrel; 3689 int dr_type, indx; 3690 asection *sreloc; 3691 3692 if (htab->elf.srelgot == NULL) 3693 abort (); 3694 3695 indx = h && h->dynindx != -1 ? h->dynindx : 0; 3696 3697 if (GOT_TLS_GDESC_P (tls_type)) 3698 { 3699 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC); 3700 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt 3701 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size); 3702 outrel.r_offset = (htab->elf.sgotplt->output_section->vma 3703 + htab->elf.sgotplt->output_offset 3704 + offplt 3705 + htab->sgotplt_jump_table_size); 3706 sreloc = htab->elf.srelplt; 3707 if (indx == 0) 3708 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info); 3709 else 3710 outrel.r_addend = 0; 3711 elf_append_rela (output_bfd, sreloc, &outrel); 3712 } 3713 3714 sreloc = htab->elf.srelgot; 3715 3716 outrel.r_offset = (htab->elf.sgot->output_section->vma 3717 + htab->elf.sgot->output_offset + off); 3718 3719 if (GOT_TLS_GD_P (tls_type)) 3720 dr_type = R_X86_64_DTPMOD64; 3721 else if (GOT_TLS_GDESC_P (tls_type)) 3722 goto dr_done; 3723 else 3724 dr_type = R_X86_64_TPOFF64; 3725 3726 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off); 3727 outrel.r_addend = 0; 3728 if ((dr_type == R_X86_64_TPOFF64 3729 || dr_type == R_X86_64_TLSDESC) && indx == 0) 3730 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info); 3731 outrel.r_info = htab->r_info (indx, dr_type); 3732 3733 elf_append_rela (output_bfd, sreloc, &outrel); 3734 3735 if (GOT_TLS_GD_P (tls_type)) 3736 { 3737 if (indx == 0) 3738 { 3739 BFD_ASSERT (! unresolved_reloc); 3740 bfd_put_64 (output_bfd, 3741 relocation - _bfd_x86_elf_dtpoff_base (info), 3742 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 3743 } 3744 else 3745 { 3746 bfd_put_64 (output_bfd, 0, 3747 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 3748 outrel.r_info = htab->r_info (indx, 3749 R_X86_64_DTPOFF64); 3750 outrel.r_offset += GOT_ENTRY_SIZE; 3751 elf_append_rela (output_bfd, sreloc, 3752 &outrel); 3753 } 3754 } 3755 3756 dr_done: 3757 if (h != NULL) 3758 h->got.offset |= 1; 3759 else 3760 local_got_offsets[r_symndx] |= 1; 3761 } 3762 3763 if (off >= (bfd_vma) -2 3764 && ! GOT_TLS_GDESC_P (tls_type)) 3765 abort (); 3766 if (r_type_tls == r_type) 3767 { 3768 if (r_type == R_X86_64_GOTPC32_TLSDESC 3769 || r_type == R_X86_64_TLSDESC_CALL) 3770 relocation = htab->elf.sgotplt->output_section->vma 3771 + htab->elf.sgotplt->output_offset 3772 + offplt + htab->sgotplt_jump_table_size; 3773 else 3774 relocation = htab->elf.sgot->output_section->vma 3775 + htab->elf.sgot->output_offset + off; 3776 unresolved_reloc = false; 3777 } 3778 else 3779 { 3780 bfd_vma roff = rel->r_offset; 3781 3782 if (r_type == R_X86_64_TLSGD) 3783 { 3784 /* GD->IE transition. For 64bit, change 3785 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 3786 .word 0x6666; rex64; call __tls_get_addr@PLT 3787 or 3788 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 3789 .byte 0x66; rex64 3790 call *__tls_get_addr@GOTPCREL(%rip 3791 which may be converted to 3792 addr32 call __tls_get_addr 3793 into: 3794 movq %fs:0, %rax 3795 addq foo@gottpoff(%rip), %rax 3796 For 32bit, change 3797 leaq foo@tlsgd(%rip), %rdi 3798 .word 0x6666; rex64; call __tls_get_addr@PLT 3799 or 3800 leaq foo@tlsgd(%rip), %rdi 3801 .byte 0x66; rex64; 3802 call *__tls_get_addr@GOTPCREL(%rip) 3803 which may be converted to 3804 addr32 call __tls_get_addr 3805 into: 3806 movl %fs:0, %eax 3807 addq foo@gottpoff(%rip), %rax 3808 For largepic, change: 3809 leaq foo@tlsgd(%rip), %rdi 3810 movabsq $__tls_get_addr@pltoff, %rax 3811 addq %r15, %rax 3812 call *%rax 3813 into: 3814 movq %fs:0, %rax 3815 addq foo@gottpoff(%rax), %rax 3816 nopw 0x0(%rax,%rax,1) */ 3817 int largepic = 0; 3818 if (ABI_64_P (output_bfd)) 3819 { 3820 if (contents[roff + 5] == 0xb8) 3821 { 3822 if (roff < 3 3823 || (roff - 3 + 22) > input_section->size) 3824 goto corrupt_input; 3825 memcpy (contents + roff - 3, 3826 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05" 3827 "\0\0\0\0\x66\x0f\x1f\x44\0", 22); 3828 largepic = 1; 3829 } 3830 else 3831 { 3832 if (roff < 4 3833 || (roff - 4 + 16) > input_section->size) 3834 goto corrupt_input; 3835 memcpy (contents + roff - 4, 3836 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", 3837 16); 3838 } 3839 } 3840 else 3841 { 3842 if (roff < 3 3843 || (roff - 3 + 15) > input_section->size) 3844 goto corrupt_input; 3845 memcpy (contents + roff - 3, 3846 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", 3847 15); 3848 } 3849 3850 relocation = (htab->elf.sgot->output_section->vma 3851 + htab->elf.sgot->output_offset + off 3852 - roff 3853 - largepic 3854 - input_section->output_section->vma 3855 - input_section->output_offset 3856 - 12); 3857 bfd_put_32 (output_bfd, relocation, 3858 contents + roff + 8 + largepic); 3859 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */ 3860 rel++; 3861 wrel++; 3862 continue; 3863 } 3864 else if (r_type == R_X86_64_GOTPC32_TLSDESC) 3865 { 3866 /* GDesc -> IE transition. 3867 It's originally something like: 3868 leaq x@tlsdesc(%rip), %rax <--- LP64 mode. 3869 rex leal x@tlsdesc(%rip), %eax <--- X32 mode. 3870 3871 Change it to: 3872 # before xchg %ax,%ax in LP64 mode. 3873 movq x@gottpoff(%rip), %rax 3874 # before nopl (%rax) in X32 mode. 3875 rex movl x@gottpoff(%rip), %eax 3876 */ 3877 3878 /* Now modify the instruction as appropriate. To 3879 turn a lea into a mov in the form we use it, it 3880 suffices to change the second byte from 0x8d to 3881 0x8b. */ 3882 if (roff < 2) 3883 goto corrupt_input; 3884 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); 3885 3886 bfd_put_32 (output_bfd, 3887 htab->elf.sgot->output_section->vma 3888 + htab->elf.sgot->output_offset + off 3889 - rel->r_offset 3890 - input_section->output_section->vma 3891 - input_section->output_offset 3892 - 4, 3893 contents + roff); 3894 continue; 3895 } 3896 else if (r_type == R_X86_64_TLSDESC_CALL) 3897 { 3898 /* GDesc -> IE transition. 3899 It's originally: 3900 call *(%rax) <--- LP64 mode. 3901 call *(%eax) <--- X32 mode. 3902 3903 Change it to: 3904 xchg %ax, %ax <-- LP64 mode. 3905 nopl (%rax) <-- X32 mode. 3906 */ 3907 3908 unsigned int prefix = 0; 3909 if (!ABI_64_P (input_bfd)) 3910 { 3911 /* Check for call *x@tlsdesc(%eax). */ 3912 if (contents[roff] == 0x67) 3913 prefix = 1; 3914 } 3915 if (prefix) 3916 { 3917 bfd_put_8 (output_bfd, 0x0f, contents + roff); 3918 bfd_put_8 (output_bfd, 0x1f, contents + roff + 1); 3919 bfd_put_8 (output_bfd, 0x00, contents + roff + 2); 3920 } 3921 else 3922 { 3923 bfd_put_8 (output_bfd, 0x66, contents + roff); 3924 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 3925 } 3926 continue; 3927 } 3928 else 3929 BFD_ASSERT (false); 3930 } 3931 break; 3932 3933 case R_X86_64_TLSLD: 3934 if (! elf_x86_64_tls_transition (info, input_bfd, 3935 input_section, contents, 3936 symtab_hdr, sym_hashes, 3937 &r_type, GOT_UNKNOWN, rel, 3938 relend, h, r_symndx, true)) 3939 return false; 3940 3941 if (r_type != R_X86_64_TLSLD) 3942 { 3943 /* LD->LE transition: 3944 leaq foo@tlsld(%rip), %rdi 3945 call __tls_get_addr@PLT 3946 For 64bit, we change it into: 3947 .word 0x6666; .byte 0x66; movq %fs:0, %rax 3948 For 32bit, we change it into: 3949 nopl 0x0(%rax); movl %fs:0, %eax 3950 Or 3951 leaq foo@tlsld(%rip), %rdi; 3952 call *__tls_get_addr@GOTPCREL(%rip) 3953 which may be converted to 3954 addr32 call __tls_get_addr 3955 For 64bit, we change it into: 3956 .word 0x6666; .word 0x6666; movq %fs:0, %rax 3957 For 32bit, we change it into: 3958 nopw 0x0(%rax); movl %fs:0, %eax 3959 For largepic, change: 3960 leaq foo@tlsgd(%rip), %rdi 3961 movabsq $__tls_get_addr@pltoff, %rax 3962 addq %rbx, %rax 3963 call *%rax 3964 into 3965 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1) 3966 movq %fs:0, %eax */ 3967 3968 BFD_ASSERT (r_type == R_X86_64_TPOFF32); 3969 if (ABI_64_P (output_bfd)) 3970 { 3971 if ((rel->r_offset + 5) >= input_section->size) 3972 goto corrupt_input; 3973 if (contents[rel->r_offset + 5] == 0xb8) 3974 { 3975 if (rel->r_offset < 3 3976 || (rel->r_offset - 3 + 22) > input_section->size) 3977 goto corrupt_input; 3978 memcpy (contents + rel->r_offset - 3, 3979 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0" 3980 "\x64\x48\x8b\x04\x25\0\0\0", 22); 3981 } 3982 else if (contents[rel->r_offset + 4] == 0xff 3983 || contents[rel->r_offset + 4] == 0x67) 3984 { 3985 if (rel->r_offset < 3 3986 || (rel->r_offset - 3 + 13) > input_section->size) 3987 goto corrupt_input; 3988 memcpy (contents + rel->r_offset - 3, 3989 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 3990 13); 3991 3992 } 3993 else 3994 { 3995 if (rel->r_offset < 3 3996 || (rel->r_offset - 3 + 12) > input_section->size) 3997 goto corrupt_input; 3998 memcpy (contents + rel->r_offset - 3, 3999 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); 4000 } 4001 } 4002 else 4003 { 4004 if ((rel->r_offset + 4) >= input_section->size) 4005 goto corrupt_input; 4006 if (contents[rel->r_offset + 4] == 0xff) 4007 { 4008 if (rel->r_offset < 3 4009 || (rel->r_offset - 3 + 13) > input_section->size) 4010 goto corrupt_input; 4011 memcpy (contents + rel->r_offset - 3, 4012 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 4013 13); 4014 } 4015 else 4016 { 4017 if (rel->r_offset < 3 4018 || (rel->r_offset - 3 + 12) > input_section->size) 4019 goto corrupt_input; 4020 memcpy (contents + rel->r_offset - 3, 4021 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12); 4022 } 4023 } 4024 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX 4025 and R_X86_64_PLTOFF64. */ 4026 rel++; 4027 wrel++; 4028 continue; 4029 } 4030 4031 if (htab->elf.sgot == NULL) 4032 abort (); 4033 4034 off = htab->tls_ld_or_ldm_got.offset; 4035 if (off & 1) 4036 off &= ~1; 4037 else 4038 { 4039 Elf_Internal_Rela outrel; 4040 4041 if (htab->elf.srelgot == NULL) 4042 abort (); 4043 4044 outrel.r_offset = (htab->elf.sgot->output_section->vma 4045 + htab->elf.sgot->output_offset + off); 4046 4047 bfd_put_64 (output_bfd, 0, 4048 htab->elf.sgot->contents + off); 4049 bfd_put_64 (output_bfd, 0, 4050 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 4051 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64); 4052 outrel.r_addend = 0; 4053 elf_append_rela (output_bfd, htab->elf.srelgot, 4054 &outrel); 4055 htab->tls_ld_or_ldm_got.offset |= 1; 4056 } 4057 relocation = htab->elf.sgot->output_section->vma 4058 + htab->elf.sgot->output_offset + off; 4059 unresolved_reloc = false; 4060 break; 4061 4062 case R_X86_64_DTPOFF32: 4063 if (!bfd_link_executable (info) 4064 || (input_section->flags & SEC_CODE) == 0) 4065 relocation -= _bfd_x86_elf_dtpoff_base (info); 4066 else 4067 relocation = elf_x86_64_tpoff (info, relocation); 4068 break; 4069 4070 case R_X86_64_TPOFF32: 4071 case R_X86_64_TPOFF64: 4072 BFD_ASSERT (bfd_link_executable (info)); 4073 relocation = elf_x86_64_tpoff (info, relocation); 4074 break; 4075 4076 case R_X86_64_DTPOFF64: 4077 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0); 4078 relocation -= _bfd_x86_elf_dtpoff_base (info); 4079 break; 4080 4081 default: 4082 break; 4083 } 4084 4085 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 4086 because such sections are not SEC_ALLOC and thus ld.so will 4087 not process them. */ 4088 if (unresolved_reloc 4089 && !((input_section->flags & SEC_DEBUGGING) != 0 4090 && h->def_dynamic) 4091 && _bfd_elf_section_offset (output_bfd, info, input_section, 4092 rel->r_offset) != (bfd_vma) -1) 4093 { 4094 switch (r_type) 4095 { 4096 case R_X86_64_32S: 4097 sec = h->root.u.def.section; 4098 if ((info->nocopyreloc || eh->def_protected) 4099 && !(h->root.u.def.section->flags & SEC_CODE)) 4100 return elf_x86_64_need_pic (info, input_bfd, input_section, 4101 h, NULL, NULL, howto); 4102 /* Fall through. */ 4103 4104 default: 4105 _bfd_error_handler 4106 /* xgettext:c-format */ 4107 (_("%pB(%pA+%#" PRIx64 "): " 4108 "unresolvable %s relocation against symbol `%s'"), 4109 input_bfd, 4110 input_section, 4111 (uint64_t) rel->r_offset, 4112 howto->name, 4113 h->root.root.string); 4114 return false; 4115 } 4116 } 4117 4118 do_relocation: 4119 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 4120 contents, rel->r_offset, 4121 relocation, rel->r_addend); 4122 4123 check_relocation_error: 4124 if (r != bfd_reloc_ok) 4125 { 4126 const char *name; 4127 4128 if (h != NULL) 4129 name = h->root.root.string; 4130 else 4131 { 4132 name = bfd_elf_string_from_elf_section (input_bfd, 4133 symtab_hdr->sh_link, 4134 sym->st_name); 4135 if (name == NULL) 4136 return false; 4137 if (*name == '\0') 4138 name = bfd_section_name (sec); 4139 } 4140 4141 if (r == bfd_reloc_overflow) 4142 { 4143 if (converted_reloc) 4144 { 4145 info->callbacks->einfo 4146 ("%X%H:", input_bfd, input_section, rel->r_offset); 4147 info->callbacks->einfo 4148 (_(" failed to convert GOTPCREL relocation against " 4149 "'%s'; relink with --no-relax\n"), 4150 name); 4151 status = false; 4152 continue; 4153 } 4154 (*info->callbacks->reloc_overflow) 4155 (info, (h ? &h->root : NULL), name, howto->name, 4156 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 4157 } 4158 else 4159 { 4160 _bfd_error_handler 4161 /* xgettext:c-format */ 4162 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"), 4163 input_bfd, input_section, 4164 (uint64_t) rel->r_offset, name, (int) r); 4165 return false; 4166 } 4167 } 4168 4169 if (wrel != rel) 4170 *wrel = *rel; 4171 } 4172 4173 if (wrel != rel) 4174 { 4175 Elf_Internal_Shdr *rel_hdr; 4176 size_t deleted = rel - wrel; 4177 4178 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); 4179 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; 4180 if (rel_hdr->sh_size == 0) 4181 { 4182 /* It is too late to remove an empty reloc section. Leave 4183 one NONE reloc. 4184 ??? What is wrong with an empty section??? */ 4185 rel_hdr->sh_size = rel_hdr->sh_entsize; 4186 deleted -= 1; 4187 } 4188 rel_hdr = _bfd_elf_single_rel_hdr (input_section); 4189 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; 4190 input_section->reloc_count -= deleted; 4191 } 4192 4193 return status; 4194} 4195 4196/* Finish up dynamic symbol handling. We set the contents of various 4197 dynamic sections here. */ 4198 4199static bool 4200elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, 4201 struct bfd_link_info *info, 4202 struct elf_link_hash_entry *h, 4203 Elf_Internal_Sym *sym) 4204{ 4205 struct elf_x86_link_hash_table *htab; 4206 bool use_plt_second; 4207 struct elf_x86_link_hash_entry *eh; 4208 bool local_undefweak; 4209 4210 htab = elf_x86_hash_table (info, X86_64_ELF_DATA); 4211 if (htab == NULL) 4212 return false; 4213 4214 /* Use the second PLT section only if there is .plt section. */ 4215 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL; 4216 4217 eh = (struct elf_x86_link_hash_entry *) h; 4218 if (eh->no_finish_dynamic_symbol) 4219 abort (); 4220 4221 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for 4222 resolved undefined weak symbols in executable so that their 4223 references have value 0 at run-time. */ 4224 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); 4225 4226 if (h->plt.offset != (bfd_vma) -1) 4227 { 4228 bfd_vma plt_index; 4229 bfd_vma got_offset, plt_offset; 4230 Elf_Internal_Rela rela; 4231 bfd_byte *loc; 4232 asection *plt, *gotplt, *relplt, *resolved_plt; 4233 const struct elf_backend_data *bed; 4234 bfd_vma plt_got_pcrel_offset; 4235 4236 /* When building a static executable, use .iplt, .igot.plt and 4237 .rela.iplt sections for STT_GNU_IFUNC symbols. */ 4238 if (htab->elf.splt != NULL) 4239 { 4240 plt = htab->elf.splt; 4241 gotplt = htab->elf.sgotplt; 4242 relplt = htab->elf.srelplt; 4243 } 4244 else 4245 { 4246 plt = htab->elf.iplt; 4247 gotplt = htab->elf.igotplt; 4248 relplt = htab->elf.irelplt; 4249 } 4250 4251 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak) 4252 4253 /* Get the index in the procedure linkage table which 4254 corresponds to this symbol. This is the index of this symbol 4255 in all the symbols for which we are making plt entries. The 4256 first entry in the procedure linkage table is reserved. 4257 4258 Get the offset into the .got table of the entry that 4259 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE 4260 bytes. The first three are reserved for the dynamic linker. 4261 4262 For static executables, we don't reserve anything. */ 4263 4264 if (plt == htab->elf.splt) 4265 { 4266 got_offset = (h->plt.offset / htab->plt.plt_entry_size 4267 - htab->plt.has_plt0); 4268 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE; 4269 } 4270 else 4271 { 4272 got_offset = h->plt.offset / htab->plt.plt_entry_size; 4273 got_offset = got_offset * GOT_ENTRY_SIZE; 4274 } 4275 4276 /* Fill in the entry in the procedure linkage table. */ 4277 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry, 4278 htab->plt.plt_entry_size); 4279 if (use_plt_second) 4280 { 4281 memcpy (htab->plt_second->contents + eh->plt_second.offset, 4282 htab->non_lazy_plt->plt_entry, 4283 htab->non_lazy_plt->plt_entry_size); 4284 4285 resolved_plt = htab->plt_second; 4286 plt_offset = eh->plt_second.offset; 4287 } 4288 else 4289 { 4290 resolved_plt = plt; 4291 plt_offset = h->plt.offset; 4292 } 4293 4294 /* Insert the relocation positions of the plt section. */ 4295 4296 /* Put offset the PC-relative instruction referring to the GOT entry, 4297 subtracting the size of that instruction. */ 4298 plt_got_pcrel_offset = (gotplt->output_section->vma 4299 + gotplt->output_offset 4300 + got_offset 4301 - resolved_plt->output_section->vma 4302 - resolved_plt->output_offset 4303 - plt_offset 4304 - htab->plt.plt_got_insn_size); 4305 4306 /* Check PC-relative offset overflow in PLT entry. */ 4307 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff) 4308 /* xgettext:c-format */ 4309 info->callbacks->einfo (_("%F%pB: PC-relative offset overflow in PLT entry for `%s'\n"), 4310 output_bfd, h->root.root.string); 4311 4312 bfd_put_32 (output_bfd, plt_got_pcrel_offset, 4313 (resolved_plt->contents + plt_offset 4314 + htab->plt.plt_got_offset)); 4315 4316 /* Fill in the entry in the global offset table, initially this 4317 points to the second part of the PLT entry. Leave the entry 4318 as zero for undefined weak symbol in PIE. No PLT relocation 4319 against undefined weak symbol in PIE. */ 4320 if (!local_undefweak) 4321 { 4322 if (htab->plt.has_plt0) 4323 bfd_put_64 (output_bfd, (plt->output_section->vma 4324 + plt->output_offset 4325 + h->plt.offset 4326 + htab->lazy_plt->plt_lazy_offset), 4327 gotplt->contents + got_offset); 4328 4329 /* Fill in the entry in the .rela.plt section. */ 4330 rela.r_offset = (gotplt->output_section->vma 4331 + gotplt->output_offset 4332 + got_offset); 4333 if (PLT_LOCAL_IFUNC_P (info, h)) 4334 { 4335 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 4336 h->root.root.string, 4337 h->root.u.def.section->owner); 4338 4339 /* If an STT_GNU_IFUNC symbol is locally defined, generate 4340 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */ 4341 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE); 4342 rela.r_addend = (h->root.u.def.value 4343 + h->root.u.def.section->output_section->vma 4344 + h->root.u.def.section->output_offset); 4345 4346 if (htab->params->report_relative_reloc) 4347 _bfd_x86_elf_link_report_relative_reloc 4348 (info, relplt, h, sym, "R_X86_64_IRELATIVE", &rela); 4349 4350 /* R_X86_64_IRELATIVE comes last. */ 4351 plt_index = htab->next_irelative_index--; 4352 } 4353 else 4354 { 4355 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT); 4356 rela.r_addend = 0; 4357 plt_index = htab->next_jump_slot_index++; 4358 } 4359 4360 /* Don't fill the second and third slots in PLT entry for 4361 static executables nor without PLT0. */ 4362 if (plt == htab->elf.splt && htab->plt.has_plt0) 4363 { 4364 bfd_vma plt0_offset 4365 = h->plt.offset + htab->lazy_plt->plt_plt_insn_end; 4366 4367 /* Put relocation index. */ 4368 bfd_put_32 (output_bfd, plt_index, 4369 (plt->contents + h->plt.offset 4370 + htab->lazy_plt->plt_reloc_offset)); 4371 4372 /* Put offset for jmp .PLT0 and check for overflow. We don't 4373 check relocation index for overflow since branch displacement 4374 will overflow first. */ 4375 if (plt0_offset > 0x80000000) 4376 /* xgettext:c-format */ 4377 info->callbacks->einfo (_("%F%pB: branch displacement overflow in PLT entry for `%s'\n"), 4378 output_bfd, h->root.root.string); 4379 bfd_put_32 (output_bfd, - plt0_offset, 4380 (plt->contents + h->plt.offset 4381 + htab->lazy_plt->plt_plt_offset)); 4382 } 4383 4384 bed = get_elf_backend_data (output_bfd); 4385 loc = relplt->contents + plt_index * bed->s->sizeof_rela; 4386 bed->s->swap_reloca_out (output_bfd, &rela, loc); 4387 } 4388 } 4389 else if (eh->plt_got.offset != (bfd_vma) -1) 4390 { 4391 bfd_vma got_offset, plt_offset; 4392 asection *plt, *got; 4393 bool got_after_plt; 4394 int32_t got_pcrel_offset; 4395 4396 /* Set the entry in the GOT procedure linkage table. */ 4397 plt = htab->plt_got; 4398 got = htab->elf.sgot; 4399 got_offset = h->got.offset; 4400 4401 if (got_offset == (bfd_vma) -1 4402 || (h->type == STT_GNU_IFUNC && h->def_regular) 4403 || plt == NULL 4404 || got == NULL) 4405 abort (); 4406 4407 /* Use the non-lazy PLT entry template for the GOT PLT since they 4408 are the identical. */ 4409 /* Fill in the entry in the GOT procedure linkage table. */ 4410 plt_offset = eh->plt_got.offset; 4411 memcpy (plt->contents + plt_offset, 4412 htab->non_lazy_plt->plt_entry, 4413 htab->non_lazy_plt->plt_entry_size); 4414 4415 /* Put offset the PC-relative instruction referring to the GOT 4416 entry, subtracting the size of that instruction. */ 4417 got_pcrel_offset = (got->output_section->vma 4418 + got->output_offset 4419 + got_offset 4420 - plt->output_section->vma 4421 - plt->output_offset 4422 - plt_offset 4423 - htab->non_lazy_plt->plt_got_insn_size); 4424 4425 /* Check PC-relative offset overflow in GOT PLT entry. */ 4426 got_after_plt = got->output_section->vma > plt->output_section->vma; 4427 if ((got_after_plt && got_pcrel_offset < 0) 4428 || (!got_after_plt && got_pcrel_offset > 0)) 4429 /* xgettext:c-format */ 4430 info->callbacks->einfo (_("%F%pB: PC-relative offset overflow in GOT PLT entry for `%s'\n"), 4431 output_bfd, h->root.root.string); 4432 4433 bfd_put_32 (output_bfd, got_pcrel_offset, 4434 (plt->contents + plt_offset 4435 + htab->non_lazy_plt->plt_got_offset)); 4436 } 4437 4438 if (!local_undefweak 4439 && !h->def_regular 4440 && (h->plt.offset != (bfd_vma) -1 4441 || eh->plt_got.offset != (bfd_vma) -1)) 4442 { 4443 /* Mark the symbol as undefined, rather than as defined in 4444 the .plt section. Leave the value if there were any 4445 relocations where pointer equality matters (this is a clue 4446 for the dynamic linker, to make function pointer 4447 comparisons work between an application and shared 4448 library), otherwise set it to zero. If a function is only 4449 called from a binary, there is no need to slow down 4450 shared libraries because of that. */ 4451 sym->st_shndx = SHN_UNDEF; 4452 if (!h->pointer_equality_needed) 4453 sym->st_value = 0; 4454 } 4455 4456 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym); 4457 4458 /* Don't generate dynamic GOT relocation against undefined weak 4459 symbol in executable. */ 4460 if (h->got.offset != (bfd_vma) -1 4461 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h)->tls_type) 4462 && elf_x86_hash_entry (h)->tls_type != GOT_TLS_IE 4463 && !local_undefweak) 4464 { 4465 Elf_Internal_Rela rela; 4466 asection *relgot = htab->elf.srelgot; 4467 const char *relative_reloc_name = NULL; 4468 bool generate_dynamic_reloc = true; 4469 4470 /* This symbol has an entry in the global offset table. Set it 4471 up. */ 4472 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 4473 abort (); 4474 4475 rela.r_offset = (htab->elf.sgot->output_section->vma 4476 + htab->elf.sgot->output_offset 4477 + (h->got.offset &~ (bfd_vma) 1)); 4478 4479 /* If this is a static link, or it is a -Bsymbolic link and the 4480 symbol is defined locally or was forced to be local because 4481 of a version file, we just want to emit a RELATIVE reloc. 4482 The entry in the global offset table will already have been 4483 initialized in the relocate_section function. */ 4484 if (h->def_regular 4485 && h->type == STT_GNU_IFUNC) 4486 { 4487 if (h->plt.offset == (bfd_vma) -1) 4488 { 4489 /* STT_GNU_IFUNC is referenced without PLT. */ 4490 if (htab->elf.splt == NULL) 4491 { 4492 /* use .rel[a].iplt section to store .got relocations 4493 in static executable. */ 4494 relgot = htab->elf.irelplt; 4495 } 4496 if (SYMBOL_REFERENCES_LOCAL_P (info, h)) 4497 { 4498 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 4499 h->root.root.string, 4500 h->root.u.def.section->owner); 4501 4502 rela.r_info = htab->r_info (0, 4503 R_X86_64_IRELATIVE); 4504 rela.r_addend = (h->root.u.def.value 4505 + h->root.u.def.section->output_section->vma 4506 + h->root.u.def.section->output_offset); 4507 relative_reloc_name = "R_X86_64_IRELATIVE"; 4508 } 4509 else 4510 goto do_glob_dat; 4511 } 4512 else if (bfd_link_pic (info)) 4513 { 4514 /* Generate R_X86_64_GLOB_DAT. */ 4515 goto do_glob_dat; 4516 } 4517 else 4518 { 4519 asection *plt; 4520 bfd_vma plt_offset; 4521 4522 if (!h->pointer_equality_needed) 4523 abort (); 4524 4525 /* For non-shared object, we can't use .got.plt, which 4526 contains the real function addres if we need pointer 4527 equality. We load the GOT entry with the PLT entry. */ 4528 if (htab->plt_second != NULL) 4529 { 4530 plt = htab->plt_second; 4531 plt_offset = eh->plt_second.offset; 4532 } 4533 else 4534 { 4535 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; 4536 plt_offset = h->plt.offset; 4537 } 4538 bfd_put_64 (output_bfd, (plt->output_section->vma 4539 + plt->output_offset 4540 + plt_offset), 4541 htab->elf.sgot->contents + h->got.offset); 4542 return true; 4543 } 4544 } 4545 else if (bfd_link_pic (info) 4546 && SYMBOL_REFERENCES_LOCAL_P (info, h)) 4547 { 4548 if (!SYMBOL_DEFINED_NON_SHARED_P (h)) 4549 return false; 4550 BFD_ASSERT((h->got.offset & 1) != 0); 4551 if (info->enable_dt_relr) 4552 generate_dynamic_reloc = false; 4553 else 4554 { 4555 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE); 4556 rela.r_addend = (h->root.u.def.value 4557 + h->root.u.def.section->output_section->vma 4558 + h->root.u.def.section->output_offset); 4559 relative_reloc_name = "R_X86_64_RELATIVE"; 4560 } 4561 } 4562 else 4563 { 4564 BFD_ASSERT((h->got.offset & 1) == 0); 4565 do_glob_dat: 4566 bfd_put_64 (output_bfd, (bfd_vma) 0, 4567 htab->elf.sgot->contents + h->got.offset); 4568 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT); 4569 rela.r_addend = 0; 4570 } 4571 4572 if (generate_dynamic_reloc) 4573 { 4574 if (relative_reloc_name != NULL 4575 && htab->params->report_relative_reloc) 4576 _bfd_x86_elf_link_report_relative_reloc 4577 (info, relgot, h, sym, relative_reloc_name, &rela); 4578 4579 elf_append_rela (output_bfd, relgot, &rela); 4580 } 4581 } 4582 4583 if (h->needs_copy) 4584 { 4585 Elf_Internal_Rela rela; 4586 asection *s; 4587 4588 /* This symbol needs a copy reloc. Set it up. */ 4589 VERIFY_COPY_RELOC (h, htab) 4590 4591 rela.r_offset = (h->root.u.def.value 4592 + h->root.u.def.section->output_section->vma 4593 + h->root.u.def.section->output_offset); 4594 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY); 4595 rela.r_addend = 0; 4596 if (h->root.u.def.section == htab->elf.sdynrelro) 4597 s = htab->elf.sreldynrelro; 4598 else 4599 s = htab->elf.srelbss; 4600 elf_append_rela (output_bfd, s, &rela); 4601 } 4602 4603 return true; 4604} 4605 4606/* Finish up local dynamic symbol handling. We set the contents of 4607 various dynamic sections here. */ 4608 4609static int 4610elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf) 4611{ 4612 struct elf_link_hash_entry *h 4613 = (struct elf_link_hash_entry *) *slot; 4614 struct bfd_link_info *info 4615 = (struct bfd_link_info *) inf; 4616 4617 return elf_x86_64_finish_dynamic_symbol (info->output_bfd, 4618 info, h, NULL); 4619} 4620 4621/* Finish up undefined weak symbol handling in PIE. Fill its PLT entry 4622 here since undefined weak symbol may not be dynamic and may not be 4623 called for elf_x86_64_finish_dynamic_symbol. */ 4624 4625static bool 4626elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh, 4627 void *inf) 4628{ 4629 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh; 4630 struct bfd_link_info *info = (struct bfd_link_info *) inf; 4631 4632 if (h->root.type != bfd_link_hash_undefweak 4633 || h->dynindx != -1) 4634 return true; 4635 4636 return elf_x86_64_finish_dynamic_symbol (info->output_bfd, 4637 info, h, NULL); 4638} 4639 4640/* Used to decide how to sort relocs in an optimal manner for the 4641 dynamic linker, before writing them out. */ 4642 4643static enum elf_reloc_type_class 4644elf_x86_64_reloc_type_class (const struct bfd_link_info *info, 4645 const asection *rel_sec ATTRIBUTE_UNUSED, 4646 const Elf_Internal_Rela *rela) 4647{ 4648 bfd *abfd = info->output_bfd; 4649 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 4650 struct elf_x86_link_hash_table *htab 4651 = elf_x86_hash_table (info, X86_64_ELF_DATA); 4652 4653 if (htab->elf.dynsym != NULL 4654 && htab->elf.dynsym->contents != NULL) 4655 { 4656 /* Check relocation against STT_GNU_IFUNC symbol if there are 4657 dynamic symbols. */ 4658 unsigned long r_symndx = htab->r_sym (rela->r_info); 4659 if (r_symndx != STN_UNDEF) 4660 { 4661 Elf_Internal_Sym sym; 4662 if (!bed->s->swap_symbol_in (abfd, 4663 (htab->elf.dynsym->contents 4664 + r_symndx * bed->s->sizeof_sym), 4665 0, &sym)) 4666 abort (); 4667 4668 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) 4669 return reloc_class_ifunc; 4670 } 4671 } 4672 4673 switch ((int) ELF32_R_TYPE (rela->r_info)) 4674 { 4675 case R_X86_64_IRELATIVE: 4676 return reloc_class_ifunc; 4677 case R_X86_64_RELATIVE: 4678 case R_X86_64_RELATIVE64: 4679 return reloc_class_relative; 4680 case R_X86_64_JUMP_SLOT: 4681 return reloc_class_plt; 4682 case R_X86_64_COPY: 4683 return reloc_class_copy; 4684 default: 4685 return reloc_class_normal; 4686 } 4687} 4688 4689/* Finish up the dynamic sections. */ 4690 4691static bool 4692elf_x86_64_finish_dynamic_sections (bfd *output_bfd, 4693 struct bfd_link_info *info) 4694{ 4695 struct elf_x86_link_hash_table *htab; 4696 4697 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info); 4698 if (htab == NULL) 4699 return false; 4700 4701 if (! htab->elf.dynamic_sections_created) 4702 return true; 4703 4704 if (htab->elf.splt && htab->elf.splt->size > 0) 4705 { 4706 if (bfd_is_abs_section (htab->elf.splt->output_section)) 4707 { 4708 info->callbacks->einfo 4709 (_("%F%P: discarded output section: `%pA'\n"), 4710 htab->elf.splt); 4711 return false; 4712 } 4713 4714 elf_section_data (htab->elf.splt->output_section) 4715 ->this_hdr.sh_entsize = htab->plt.plt_entry_size; 4716 4717 if (htab->plt.has_plt0) 4718 { 4719 /* Fill in the special first entry in the procedure linkage 4720 table. */ 4721 memcpy (htab->elf.splt->contents, 4722 htab->lazy_plt->plt0_entry, 4723 htab->lazy_plt->plt0_entry_size); 4724 /* Add offset for pushq GOT+8(%rip), since the instruction 4725 uses 6 bytes subtract this value. */ 4726 bfd_put_32 (output_bfd, 4727 (htab->elf.sgotplt->output_section->vma 4728 + htab->elf.sgotplt->output_offset 4729 + 8 4730 - htab->elf.splt->output_section->vma 4731 - htab->elf.splt->output_offset 4732 - 6), 4733 (htab->elf.splt->contents 4734 + htab->lazy_plt->plt0_got1_offset)); 4735 /* Add offset for the PC-relative instruction accessing 4736 GOT+16, subtracting the offset to the end of that 4737 instruction. */ 4738 bfd_put_32 (output_bfd, 4739 (htab->elf.sgotplt->output_section->vma 4740 + htab->elf.sgotplt->output_offset 4741 + 16 4742 - htab->elf.splt->output_section->vma 4743 - htab->elf.splt->output_offset 4744 - htab->lazy_plt->plt0_got2_insn_end), 4745 (htab->elf.splt->contents 4746 + htab->lazy_plt->plt0_got2_offset)); 4747 } 4748 4749 if (htab->elf.tlsdesc_plt) 4750 { 4751 bfd_put_64 (output_bfd, (bfd_vma) 0, 4752 htab->elf.sgot->contents + htab->elf.tlsdesc_got); 4753 4754 memcpy (htab->elf.splt->contents + htab->elf.tlsdesc_plt, 4755 htab->lazy_plt->plt_tlsdesc_entry, 4756 htab->lazy_plt->plt_tlsdesc_entry_size); 4757 4758 /* Add offset for pushq GOT+8(%rip), since ENDBR64 uses 4 4759 bytes and the instruction uses 6 bytes, subtract these 4760 values. */ 4761 bfd_put_32 (output_bfd, 4762 (htab->elf.sgotplt->output_section->vma 4763 + htab->elf.sgotplt->output_offset 4764 + 8 4765 - htab->elf.splt->output_section->vma 4766 - htab->elf.splt->output_offset 4767 - htab->elf.tlsdesc_plt 4768 - htab->lazy_plt->plt_tlsdesc_got1_insn_end), 4769 (htab->elf.splt->contents 4770 + htab->elf.tlsdesc_plt 4771 + htab->lazy_plt->plt_tlsdesc_got1_offset)); 4772 /* Add offset for indirect branch via GOT+TDG, where TDG 4773 stands for htab->tlsdesc_got, subtracting the offset 4774 to the end of that instruction. */ 4775 bfd_put_32 (output_bfd, 4776 (htab->elf.sgot->output_section->vma 4777 + htab->elf.sgot->output_offset 4778 + htab->elf.tlsdesc_got 4779 - htab->elf.splt->output_section->vma 4780 - htab->elf.splt->output_offset 4781 - htab->elf.tlsdesc_plt 4782 - htab->lazy_plt->plt_tlsdesc_got2_insn_end), 4783 (htab->elf.splt->contents 4784 + htab->elf.tlsdesc_plt 4785 + htab->lazy_plt->plt_tlsdesc_got2_offset)); 4786 } 4787 } 4788 4789 /* Fill PLT entries for undefined weak symbols in PIE. */ 4790 if (bfd_link_pie (info)) 4791 bfd_hash_traverse (&info->hash->table, 4792 elf_x86_64_pie_finish_undefweak_symbol, 4793 info); 4794 4795 return true; 4796} 4797 4798/* Fill PLT/GOT entries and allocate dynamic relocations for local 4799 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table. 4800 It has to be done before elf_link_sort_relocs is called so that 4801 dynamic relocations are properly sorted. */ 4802 4803static bool 4804elf_x86_64_output_arch_local_syms 4805 (bfd *output_bfd ATTRIBUTE_UNUSED, 4806 struct bfd_link_info *info, 4807 void *flaginfo ATTRIBUTE_UNUSED, 4808 int (*func) (void *, const char *, 4809 Elf_Internal_Sym *, 4810 asection *, 4811 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED) 4812{ 4813 struct elf_x86_link_hash_table *htab 4814 = elf_x86_hash_table (info, X86_64_ELF_DATA); 4815 if (htab == NULL) 4816 return false; 4817 4818 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ 4819 htab_traverse (htab->loc_hash_table, 4820 elf_x86_64_finish_local_dynamic_symbol, 4821 info); 4822 4823 return true; 4824} 4825 4826/* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all 4827 dynamic relocations. */ 4828 4829static long 4830elf_x86_64_get_synthetic_symtab (bfd *abfd, 4831 long symcount ATTRIBUTE_UNUSED, 4832 asymbol **syms ATTRIBUTE_UNUSED, 4833 long dynsymcount, 4834 asymbol **dynsyms, 4835 asymbol **ret) 4836{ 4837 long count, i, n; 4838 int j; 4839 bfd_byte *plt_contents; 4840 long relsize; 4841 const struct elf_x86_lazy_plt_layout *lazy_plt; 4842 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; 4843 const struct elf_x86_lazy_plt_layout *lazy_bnd_plt; 4844 const struct elf_x86_non_lazy_plt_layout *non_lazy_bnd_plt; 4845 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt; 4846 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt; 4847 asection *plt; 4848 enum elf_x86_plt_type plt_type; 4849 struct elf_x86_plt plts[] = 4850 { 4851 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 }, 4852 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }, 4853 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 }, 4854 { ".plt.bnd", NULL, NULL, plt_second, 0, 0, 0, 0 }, 4855 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 } 4856 }; 4857 4858 *ret = NULL; 4859 4860 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0) 4861 return 0; 4862 4863 if (dynsymcount <= 0) 4864 return 0; 4865 4866 relsize = bfd_get_dynamic_reloc_upper_bound (abfd); 4867 if (relsize <= 0) 4868 return -1; 4869 4870 lazy_plt = &elf_x86_64_lazy_plt; 4871 non_lazy_plt = &elf_x86_64_non_lazy_plt; 4872 lazy_bnd_plt = &elf_x86_64_lazy_bnd_plt; 4873 non_lazy_bnd_plt = &elf_x86_64_non_lazy_bnd_plt; 4874 if (ABI_64_P (abfd)) 4875 { 4876 lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt; 4877 non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt; 4878 } 4879 else 4880 { 4881 lazy_ibt_plt = &elf_x32_lazy_ibt_plt; 4882 non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt; 4883 } 4884 4885 count = 0; 4886 for (j = 0; plts[j].name != NULL; j++) 4887 { 4888 plt = bfd_get_section_by_name (abfd, plts[j].name); 4889 if (plt == NULL || plt->size == 0) 4890 continue; 4891 4892 /* Get the PLT section contents. */ 4893 if (!bfd_malloc_and_get_section (abfd, plt, &plt_contents)) 4894 break; 4895 4896 /* Check what kind of PLT it is. */ 4897 plt_type = plt_unknown; 4898 if (plts[j].type == plt_unknown 4899 && (plt->size >= (lazy_plt->plt_entry_size 4900 + lazy_plt->plt_entry_size))) 4901 { 4902 /* Match lazy PLT first. Need to check the first two 4903 instructions. */ 4904 if ((memcmp (plt_contents, lazy_plt->plt0_entry, 4905 lazy_plt->plt0_got1_offset) == 0) 4906 && (memcmp (plt_contents + 6, lazy_plt->plt0_entry + 6, 4907 2) == 0)) 4908 plt_type = plt_lazy; 4909 else if (lazy_bnd_plt != NULL 4910 && (memcmp (plt_contents, lazy_bnd_plt->plt0_entry, 4911 lazy_bnd_plt->plt0_got1_offset) == 0) 4912 && (memcmp (plt_contents + 6, 4913 lazy_bnd_plt->plt0_entry + 6, 3) == 0)) 4914 { 4915 plt_type = plt_lazy | plt_second; 4916 /* The fist entry in the lazy IBT PLT is the same as the 4917 lazy BND PLT. */ 4918 if ((memcmp (plt_contents + lazy_ibt_plt->plt_entry_size, 4919 lazy_ibt_plt->plt_entry, 4920 lazy_ibt_plt->plt_got_offset) == 0)) 4921 lazy_plt = lazy_ibt_plt; 4922 else 4923 lazy_plt = lazy_bnd_plt; 4924 } 4925 } 4926 4927 if (non_lazy_plt != NULL 4928 && (plt_type == plt_unknown || plt_type == plt_non_lazy) 4929 && plt->size >= non_lazy_plt->plt_entry_size) 4930 { 4931 /* Match non-lazy PLT. */ 4932 if (memcmp (plt_contents, non_lazy_plt->plt_entry, 4933 non_lazy_plt->plt_got_offset) == 0) 4934 plt_type = plt_non_lazy; 4935 } 4936 4937 if (plt_type == plt_unknown || plt_type == plt_second) 4938 { 4939 if (non_lazy_bnd_plt != NULL 4940 && plt->size >= non_lazy_bnd_plt->plt_entry_size 4941 && (memcmp (plt_contents, non_lazy_bnd_plt->plt_entry, 4942 non_lazy_bnd_plt->plt_got_offset) == 0)) 4943 { 4944 /* Match BND PLT. */ 4945 plt_type = plt_second; 4946 non_lazy_plt = non_lazy_bnd_plt; 4947 } 4948 else if (non_lazy_ibt_plt != NULL 4949 && plt->size >= non_lazy_ibt_plt->plt_entry_size 4950 && (memcmp (plt_contents, 4951 non_lazy_ibt_plt->plt_entry, 4952 non_lazy_ibt_plt->plt_got_offset) == 0)) 4953 { 4954 /* Match IBT PLT. */ 4955 plt_type = plt_second; 4956 non_lazy_plt = non_lazy_ibt_plt; 4957 } 4958 } 4959 4960 if (plt_type == plt_unknown) 4961 { 4962 free (plt_contents); 4963 continue; 4964 } 4965 4966 plts[j].sec = plt; 4967 plts[j].type = plt_type; 4968 4969 if ((plt_type & plt_lazy)) 4970 { 4971 plts[j].plt_got_offset = lazy_plt->plt_got_offset; 4972 plts[j].plt_got_insn_size = lazy_plt->plt_got_insn_size; 4973 plts[j].plt_entry_size = lazy_plt->plt_entry_size; 4974 /* Skip PLT0 in lazy PLT. */ 4975 i = 1; 4976 } 4977 else 4978 { 4979 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset; 4980 plts[j].plt_got_insn_size = non_lazy_plt->plt_got_insn_size; 4981 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size; 4982 i = 0; 4983 } 4984 4985 /* Skip lazy PLT when the second PLT is used. */ 4986 if (plt_type == (plt_lazy | plt_second)) 4987 plts[j].count = 0; 4988 else 4989 { 4990 n = plt->size / plts[j].plt_entry_size; 4991 plts[j].count = n; 4992 count += n - i; 4993 } 4994 4995 plts[j].contents = plt_contents; 4996 } 4997 4998 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize, 4999 (bfd_vma) 0, plts, dynsyms, 5000 ret); 5001} 5002 5003/* Handle an x86-64 specific section when reading an object file. This 5004 is called when elfcode.h finds a section with an unknown type. */ 5005 5006static bool 5007elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr, 5008 const char *name, int shindex) 5009{ 5010 if (hdr->sh_type != SHT_X86_64_UNWIND) 5011 return false; 5012 5013 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) 5014 return false; 5015 5016 return true; 5017} 5018 5019/* Hook called by the linker routine which adds symbols from an object 5020 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead 5021 of .bss. */ 5022 5023static bool 5024elf_x86_64_add_symbol_hook (bfd *abfd, 5025 struct bfd_link_info *info ATTRIBUTE_UNUSED, 5026 Elf_Internal_Sym *sym, 5027 const char **namep ATTRIBUTE_UNUSED, 5028 flagword *flagsp ATTRIBUTE_UNUSED, 5029 asection **secp, 5030 bfd_vma *valp) 5031{ 5032 asection *lcomm; 5033 5034 switch (sym->st_shndx) 5035 { 5036 case SHN_X86_64_LCOMMON: 5037 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON"); 5038 if (lcomm == NULL) 5039 { 5040 lcomm = bfd_make_section_with_flags (abfd, 5041 "LARGE_COMMON", 5042 (SEC_ALLOC 5043 | SEC_IS_COMMON 5044 | SEC_LINKER_CREATED)); 5045 if (lcomm == NULL) 5046 return false; 5047 elf_section_flags (lcomm) |= SHF_X86_64_LARGE; 5048 } 5049 *secp = lcomm; 5050 *valp = sym->st_size; 5051 return true; 5052 } 5053 5054 return true; 5055} 5056 5057 5058/* Given a BFD section, try to locate the corresponding ELF section 5059 index. */ 5060 5061static bool 5062elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, 5063 asection *sec, int *index_return) 5064{ 5065 if (sec == &_bfd_elf_large_com_section) 5066 { 5067 *index_return = SHN_X86_64_LCOMMON; 5068 return true; 5069 } 5070 return false; 5071} 5072 5073/* Process a symbol. */ 5074 5075static void 5076elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, 5077 asymbol *asym) 5078{ 5079 elf_symbol_type *elfsym = (elf_symbol_type *) asym; 5080 5081 switch (elfsym->internal_elf_sym.st_shndx) 5082 { 5083 case SHN_X86_64_LCOMMON: 5084 asym->section = &_bfd_elf_large_com_section; 5085 asym->value = elfsym->internal_elf_sym.st_size; 5086 /* Common symbol doesn't set BSF_GLOBAL. */ 5087 asym->flags &= ~BSF_GLOBAL; 5088 break; 5089 } 5090} 5091 5092static bool 5093elf_x86_64_common_definition (Elf_Internal_Sym *sym) 5094{ 5095 return (sym->st_shndx == SHN_COMMON 5096 || sym->st_shndx == SHN_X86_64_LCOMMON); 5097} 5098 5099static unsigned int 5100elf_x86_64_common_section_index (asection *sec) 5101{ 5102 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) 5103 return SHN_COMMON; 5104 else 5105 return SHN_X86_64_LCOMMON; 5106} 5107 5108static asection * 5109elf_x86_64_common_section (asection *sec) 5110{ 5111 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) 5112 return bfd_com_section_ptr; 5113 else 5114 return &_bfd_elf_large_com_section; 5115} 5116 5117static bool 5118elf_x86_64_merge_symbol (struct elf_link_hash_entry *h, 5119 const Elf_Internal_Sym *sym, 5120 asection **psec, 5121 bool newdef, 5122 bool olddef, 5123 bfd *oldbfd, 5124 const asection *oldsec) 5125{ 5126 /* A normal common symbol and a large common symbol result in a 5127 normal common symbol. We turn the large common symbol into a 5128 normal one. */ 5129 if (!olddef 5130 && h->root.type == bfd_link_hash_common 5131 && !newdef 5132 && bfd_is_com_section (*psec) 5133 && oldsec != *psec) 5134 { 5135 if (sym->st_shndx == SHN_COMMON 5136 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0) 5137 { 5138 h->root.u.c.p->section 5139 = bfd_make_section_old_way (oldbfd, "COMMON"); 5140 h->root.u.c.p->section->flags = SEC_ALLOC; 5141 } 5142 else if (sym->st_shndx == SHN_X86_64_LCOMMON 5143 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0) 5144 *psec = bfd_com_section_ptr; 5145 } 5146 5147 return true; 5148} 5149 5150static int 5151elf_x86_64_additional_program_headers (bfd *abfd, 5152 struct bfd_link_info *info ATTRIBUTE_UNUSED) 5153{ 5154 asection *s; 5155 int count = 0; 5156 5157 /* Check to see if we need a large readonly segment. */ 5158 s = bfd_get_section_by_name (abfd, ".lrodata"); 5159 if (s && (s->flags & SEC_LOAD)) 5160 count++; 5161 5162 /* Check to see if we need a large data segment. Since .lbss sections 5163 is placed right after the .bss section, there should be no need for 5164 a large data segment just because of .lbss. */ 5165 s = bfd_get_section_by_name (abfd, ".ldata"); 5166 if (s && (s->flags & SEC_LOAD)) 5167 count++; 5168 5169 return count; 5170} 5171 5172/* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */ 5173 5174static bool 5175elf_x86_64_relocs_compatible (const bfd_target *input, 5176 const bfd_target *output) 5177{ 5178 return ((xvec_get_elf_backend_data (input)->s->elfclass 5179 == xvec_get_elf_backend_data (output)->s->elfclass) 5180 && _bfd_elf_relocs_compatible (input, output)); 5181} 5182 5183/* Set up x86-64 GNU properties. Return the first relocatable ELF input 5184 with GNU properties if found. Otherwise, return NULL. */ 5185 5186static bfd * 5187elf_x86_64_link_setup_gnu_properties (struct bfd_link_info *info) 5188{ 5189 struct elf_x86_init_table init_table; 5190 const struct elf_backend_data *bed; 5191 struct elf_x86_link_hash_table *htab; 5192 5193 if ((int) R_X86_64_standard >= (int) R_X86_64_converted_reloc_bit 5194 || (int) R_X86_64_max <= (int) R_X86_64_converted_reloc_bit 5195 || ((int) (R_X86_64_GNU_VTINHERIT | R_X86_64_converted_reloc_bit) 5196 != (int) R_X86_64_GNU_VTINHERIT) 5197 || ((int) (R_X86_64_GNU_VTENTRY | R_X86_64_converted_reloc_bit) 5198 != (int) R_X86_64_GNU_VTENTRY)) 5199 abort (); 5200 5201 /* This is unused for x86-64. */ 5202 init_table.plt0_pad_byte = 0x90; 5203 5204 bed = get_elf_backend_data (info->output_bfd); 5205 htab = elf_x86_hash_table (info, bed->target_id); 5206 if (!htab) 5207 abort (); 5208 if (htab->params->bndplt) 5209 { 5210 init_table.lazy_plt = &elf_x86_64_lazy_bnd_plt; 5211 init_table.non_lazy_plt = &elf_x86_64_non_lazy_bnd_plt; 5212 } 5213 else 5214 { 5215 init_table.lazy_plt = &elf_x86_64_lazy_plt; 5216 init_table.non_lazy_plt = &elf_x86_64_non_lazy_plt; 5217 } 5218 5219 if (ABI_64_P (info->output_bfd)) 5220 { 5221 init_table.lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt; 5222 init_table.non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt; 5223 } 5224 else 5225 { 5226 init_table.lazy_ibt_plt = &elf_x32_lazy_ibt_plt; 5227 init_table.non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt; 5228 } 5229 5230 if (ABI_64_P (info->output_bfd)) 5231 { 5232 init_table.r_info = elf64_r_info; 5233 init_table.r_sym = elf64_r_sym; 5234 } 5235 else 5236 { 5237 init_table.r_info = elf32_r_info; 5238 init_table.r_sym = elf32_r_sym; 5239 } 5240 5241 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table); 5242} 5243 5244static const struct bfd_elf_special_section 5245elf_x86_64_special_sections[]= 5246{ 5247 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, 5248 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, 5249 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE}, 5250 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, 5251 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, 5252 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, 5253 { NULL, 0, 0, 0, 0 } 5254}; 5255 5256#define TARGET_LITTLE_SYM x86_64_elf64_vec 5257#define TARGET_LITTLE_NAME "elf64-x86-64" 5258#define ELF_ARCH bfd_arch_i386 5259#define ELF_TARGET_ID X86_64_ELF_DATA 5260#define ELF_MACHINE_CODE EM_X86_64 5261#if DEFAULT_LD_Z_SEPARATE_CODE 5262# define ELF_MAXPAGESIZE 0x1000 5263#else 5264# define ELF_MAXPAGESIZE 0x200000 5265#endif 5266#define ELF_COMMONPAGESIZE 0x1000 5267 5268#define elf_backend_can_gc_sections 1 5269#define elf_backend_can_refcount 1 5270#define elf_backend_want_got_plt 1 5271#define elf_backend_plt_readonly 1 5272#define elf_backend_want_plt_sym 0 5273#define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) 5274#define elf_backend_rela_normal 1 5275#define elf_backend_plt_alignment 4 5276#define elf_backend_caches_rawsize 1 5277#define elf_backend_dtrel_excludes_plt 1 5278#define elf_backend_want_dynrelro 1 5279 5280#define elf_info_to_howto elf_x86_64_info_to_howto 5281 5282#define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup 5283#define bfd_elf64_bfd_reloc_name_lookup \ 5284 elf_x86_64_reloc_name_lookup 5285 5286#define elf_backend_relocs_compatible elf_x86_64_relocs_compatible 5287#define elf_backend_always_size_sections elf_x86_64_always_size_sections 5288#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections 5289#define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections 5290#define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol 5291#define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms 5292#define elf_backend_grok_prstatus elf_x86_64_grok_prstatus 5293#define elf_backend_grok_psinfo elf_x86_64_grok_psinfo 5294#ifdef CORE_HEADER 5295#define elf_backend_write_core_note elf_x86_64_write_core_note 5296#endif 5297#define elf_backend_reloc_type_class elf_x86_64_reloc_type_class 5298#define elf_backend_relocate_section elf_x86_64_relocate_section 5299#define elf_backend_init_index_section _bfd_elf_init_1_index_section 5300#define elf_backend_object_p elf64_x86_64_elf_object_p 5301#define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab 5302 5303#define elf_backend_section_from_shdr \ 5304 elf_x86_64_section_from_shdr 5305 5306#define elf_backend_section_from_bfd_section \ 5307 elf_x86_64_elf_section_from_bfd_section 5308#define elf_backend_add_symbol_hook \ 5309 elf_x86_64_add_symbol_hook 5310#define elf_backend_symbol_processing \ 5311 elf_x86_64_symbol_processing 5312#define elf_backend_common_section_index \ 5313 elf_x86_64_common_section_index 5314#define elf_backend_common_section \ 5315 elf_x86_64_common_section 5316#define elf_backend_common_definition \ 5317 elf_x86_64_common_definition 5318#define elf_backend_merge_symbol \ 5319 elf_x86_64_merge_symbol 5320#define elf_backend_special_sections \ 5321 elf_x86_64_special_sections 5322#define elf_backend_additional_program_headers \ 5323 elf_x86_64_additional_program_headers 5324#define elf_backend_setup_gnu_properties \ 5325 elf_x86_64_link_setup_gnu_properties 5326#define elf_backend_hide_symbol \ 5327 _bfd_x86_elf_hide_symbol 5328 5329#undef elf64_bed 5330#define elf64_bed elf64_x86_64_bed 5331 5332#include "elf64-target.h" 5333 5334/* CloudABI support. */ 5335 5336#undef TARGET_LITTLE_SYM 5337#define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec 5338#undef TARGET_LITTLE_NAME 5339#define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi" 5340 5341#undef ELF_OSABI 5342#define ELF_OSABI ELFOSABI_CLOUDABI 5343 5344#undef elf64_bed 5345#define elf64_bed elf64_x86_64_cloudabi_bed 5346 5347#include "elf64-target.h" 5348 5349/* FreeBSD support. */ 5350 5351#undef TARGET_LITTLE_SYM 5352#define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec 5353#undef TARGET_LITTLE_NAME 5354#define TARGET_LITTLE_NAME "elf64-x86-64-freebsd" 5355 5356#undef ELF_OSABI 5357#define ELF_OSABI ELFOSABI_FREEBSD 5358 5359#undef elf64_bed 5360#define elf64_bed elf64_x86_64_fbsd_bed 5361 5362#include "elf64-target.h" 5363 5364/* Solaris 2 support. */ 5365 5366#undef TARGET_LITTLE_SYM 5367#define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec 5368#undef TARGET_LITTLE_NAME 5369#define TARGET_LITTLE_NAME "elf64-x86-64-sol2" 5370 5371#undef ELF_TARGET_OS 5372#define ELF_TARGET_OS is_solaris 5373 5374/* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE 5375 objects won't be recognized. */ 5376#undef ELF_OSABI 5377 5378#undef elf64_bed 5379#define elf64_bed elf64_x86_64_sol2_bed 5380 5381/* The 64-bit static TLS arena size is rounded to the nearest 16-byte 5382 boundary. */ 5383#undef elf_backend_static_tls_alignment 5384#define elf_backend_static_tls_alignment 16 5385 5386/* The Solaris 2 ABI requires a plt symbol on all platforms. 5387 5388 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output 5389 File, p.63. */ 5390#undef elf_backend_want_plt_sym 5391#define elf_backend_want_plt_sym 1 5392 5393#undef elf_backend_strtab_flags 5394#define elf_backend_strtab_flags SHF_STRINGS 5395 5396static bool 5397elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED, 5398 bfd *obfd ATTRIBUTE_UNUSED, 5399 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED, 5400 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED) 5401{ 5402 /* PR 19938: FIXME: Need to add code for setting the sh_info 5403 and sh_link fields of Solaris specific section types. */ 5404 return false; 5405} 5406 5407#undef elf_backend_copy_special_section_fields 5408#define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields 5409 5410#include "elf64-target.h" 5411 5412/* Restore defaults. */ 5413#undef ELF_OSABI 5414#undef elf_backend_static_tls_alignment 5415#undef elf_backend_want_plt_sym 5416#define elf_backend_want_plt_sym 0 5417#undef elf_backend_strtab_flags 5418#undef elf_backend_copy_special_section_fields 5419 5420/* 32bit x86-64 support. */ 5421 5422#undef TARGET_LITTLE_SYM 5423#define TARGET_LITTLE_SYM x86_64_elf32_vec 5424#undef TARGET_LITTLE_NAME 5425#define TARGET_LITTLE_NAME "elf32-x86-64" 5426#undef elf32_bed 5427#define elf32_bed elf32_x86_64_bed 5428 5429#undef ELF_ARCH 5430#define ELF_ARCH bfd_arch_i386 5431 5432#undef ELF_MACHINE_CODE 5433#define ELF_MACHINE_CODE EM_X86_64 5434 5435#undef ELF_TARGET_OS 5436#undef ELF_OSABI 5437 5438#define bfd_elf32_bfd_reloc_type_lookup \ 5439 elf_x86_64_reloc_type_lookup 5440#define bfd_elf32_bfd_reloc_name_lookup \ 5441 elf_x86_64_reloc_name_lookup 5442#define bfd_elf32_get_synthetic_symtab \ 5443 elf_x86_64_get_synthetic_symtab 5444 5445#undef elf_backend_object_p 5446#define elf_backend_object_p \ 5447 elf32_x86_64_elf_object_p 5448 5449#undef elf_backend_bfd_from_remote_memory 5450#define elf_backend_bfd_from_remote_memory \ 5451 _bfd_elf32_bfd_from_remote_memory 5452 5453#undef elf_backend_size_info 5454#define elf_backend_size_info \ 5455 _bfd_elf32_size_info 5456 5457#include "elf32-target.h" 5458