1 /* X86-64 specific support for ELF 2 Copyright (C) 2000-2019 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 "elf-nacl.h" 24 #include "dwarf2.h" 25 #include "libiberty.h" 26 27 #include "opcode/i386.h" 28 #include "elf/x86-64.h" 29 30 #ifdef CORE_HEADER 31 #include <stdarg.h> 32 #include CORE_HEADER 33 #endif 34 35 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ 36 #define MINUS_ONE (~ (bfd_vma) 0) 37 38 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the 39 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get 40 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE 41 since they are the same. */ 42 43 /* The relocation "howto" table. Order of fields: 44 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow, 45 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */ 46 static reloc_howto_type x86_64_elf_howto_table[] = 47 { 48 HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont, 49 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000, 50 FALSE), 51 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 52 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE, 53 FALSE), 54 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, 55 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff, 56 TRUE), 57 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed, 58 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff, 59 FALSE), 60 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed, 61 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff, 62 TRUE), 63 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 64 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff, 65 FALSE), 66 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 67 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE, 68 MINUS_ONE, FALSE), 69 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 70 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE, 71 MINUS_ONE, FALSE), 72 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 73 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE, 74 MINUS_ONE, FALSE), 75 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, 76 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff, 77 0xffffffff, TRUE), 78 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, 79 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, 80 FALSE), 81 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed, 82 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff, 83 FALSE), 84 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 85 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE), 86 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield, 87 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE), 88 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 89 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE), 90 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, 91 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE), 92 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 93 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE, 94 MINUS_ONE, FALSE), 95 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 96 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE, 97 MINUS_ONE, FALSE), 98 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 99 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE, 100 MINUS_ONE, FALSE), 101 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed, 102 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff, 103 0xffffffff, TRUE), 104 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed, 105 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff, 106 0xffffffff, TRUE), 107 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, 108 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff, 109 0xffffffff, FALSE), 110 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed, 111 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff, 112 0xffffffff, TRUE), 113 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, 114 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff, 115 0xffffffff, FALSE), 116 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, 117 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE, 118 TRUE), 119 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 120 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64", 121 FALSE, MINUS_ONE, MINUS_ONE, FALSE), 122 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, 123 bfd_elf_generic_reloc, "R_X86_64_GOTPC32", 124 FALSE, 0xffffffff, 0xffffffff, TRUE), 125 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, 126 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE, 127 FALSE), 128 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed, 129 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE, 130 MINUS_ONE, TRUE), 131 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed, 132 bfd_elf_generic_reloc, "R_X86_64_GOTPC64", 133 FALSE, MINUS_ONE, MINUS_ONE, TRUE), 134 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, 135 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE, 136 MINUS_ONE, FALSE), 137 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed, 138 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE, 139 MINUS_ONE, FALSE), 140 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, 141 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff, 142 FALSE), 143 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned, 144 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE, 145 FALSE), 146 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0, 147 complain_overflow_bitfield, bfd_elf_generic_reloc, 148 "R_X86_64_GOTPC32_TLSDESC", 149 FALSE, 0xffffffff, 0xffffffff, TRUE), 150 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0, 151 complain_overflow_dont, bfd_elf_generic_reloc, 152 "R_X86_64_TLSDESC_CALL", 153 FALSE, 0, 0, FALSE), 154 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0, 155 complain_overflow_bitfield, bfd_elf_generic_reloc, 156 "R_X86_64_TLSDESC", 157 FALSE, MINUS_ONE, MINUS_ONE, FALSE), 158 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 159 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE, 160 MINUS_ONE, FALSE), 161 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, 162 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE, 163 MINUS_ONE, FALSE), 164 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed, 165 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff, 166 TRUE), 167 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed, 168 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff, 169 TRUE), 170 HOWTO(R_X86_64_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed, 171 bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", FALSE, 0xffffffff, 172 0xffffffff, TRUE), 173 HOWTO(R_X86_64_REX_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed, 174 bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", FALSE, 0xffffffff, 175 0xffffffff, TRUE), 176 177 /* We have a gap in the reloc numbers here. 178 R_X86_64_standard counts the number up to this point, and 179 R_X86_64_vt_offset is the value to subtract from a reloc type of 180 R_X86_64_GNU_VT* to form an index into this table. */ 181 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1) 182 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard) 183 184 /* GNU extension to record C++ vtable hierarchy. */ 185 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont, 186 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE), 187 188 /* GNU extension to record C++ vtable member usage. */ 189 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont, 190 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0, 191 FALSE), 192 193 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */ 194 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 195 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, 196 FALSE) 197 }; 198 199 /* Set if a relocation is converted from a GOTPCREL relocation. */ 200 #define R_X86_64_converted_reloc_bit (1 << 7) 201 202 #define X86_PCREL_TYPE_P(TYPE) \ 203 ( ((TYPE) == R_X86_64_PC8) \ 204 || ((TYPE) == R_X86_64_PC16) \ 205 || ((TYPE) == R_X86_64_PC32) \ 206 || ((TYPE) == R_X86_64_PC32_BND) \ 207 || ((TYPE) == R_X86_64_PC64)) 208 209 #define X86_SIZE_TYPE_P(TYPE) \ 210 ((TYPE) == R_X86_64_SIZE32 || (TYPE) == R_X86_64_SIZE64) 211 212 /* Map BFD relocs to the x86_64 elf relocs. */ 213 struct elf_reloc_map 214 { 215 bfd_reloc_code_real_type bfd_reloc_val; 216 unsigned char elf_reloc_val; 217 }; 218 219 static const struct elf_reloc_map x86_64_reloc_map[] = 220 { 221 { BFD_RELOC_NONE, R_X86_64_NONE, }, 222 { BFD_RELOC_64, R_X86_64_64, }, 223 { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, 224 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, 225 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, 226 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, 227 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, 228 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, 229 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, 230 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, 231 { BFD_RELOC_32, R_X86_64_32, }, 232 { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, 233 { BFD_RELOC_16, R_X86_64_16, }, 234 { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, 235 { BFD_RELOC_8, R_X86_64_8, }, 236 { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, 237 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, 238 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, 239 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, 240 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, 241 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, 242 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, 243 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, 244 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, 245 { BFD_RELOC_64_PCREL, R_X86_64_PC64, }, 246 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, }, 247 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, }, 248 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, }, 249 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, }, 250 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, }, 251 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, }, 252 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, }, 253 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, }, 254 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, }, 255 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, }, 256 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, }, 257 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, }, 258 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, }, 259 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, }, 260 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, }, 261 { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, }, 262 { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, }, 263 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, 264 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, 265 }; 266 267 static reloc_howto_type * 268 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type) 269 { 270 unsigned i; 271 272 if (r_type == (unsigned int) R_X86_64_32) 273 { 274 if (ABI_64_P (abfd)) 275 i = r_type; 276 else 277 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1; 278 } 279 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT 280 || r_type >= (unsigned int) R_X86_64_max) 281 { 282 if (r_type >= (unsigned int) R_X86_64_standard) 283 { 284 /* xgettext:c-format */ 285 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 286 abfd, r_type); 287 bfd_set_error (bfd_error_bad_value); 288 return NULL; 289 } 290 i = r_type; 291 } 292 else 293 i = r_type - (unsigned int) R_X86_64_vt_offset; 294 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type); 295 return &x86_64_elf_howto_table[i]; 296 } 297 298 /* Given a BFD reloc type, return a HOWTO structure. */ 299 static reloc_howto_type * 300 elf_x86_64_reloc_type_lookup (bfd *abfd, 301 bfd_reloc_code_real_type code) 302 { 303 unsigned int i; 304 305 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); 306 i++) 307 { 308 if (x86_64_reloc_map[i].bfd_reloc_val == code) 309 return elf_x86_64_rtype_to_howto (abfd, 310 x86_64_reloc_map[i].elf_reloc_val); 311 } 312 return NULL; 313 } 314 315 static reloc_howto_type * 316 elf_x86_64_reloc_name_lookup (bfd *abfd, 317 const char *r_name) 318 { 319 unsigned int i; 320 321 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0) 322 { 323 /* Get x32 R_X86_64_32. */ 324 reloc_howto_type *reloc 325 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1]; 326 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32); 327 return reloc; 328 } 329 330 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++) 331 if (x86_64_elf_howto_table[i].name != NULL 332 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0) 333 return &x86_64_elf_howto_table[i]; 334 335 return NULL; 336 } 337 338 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */ 339 340 static bfd_boolean 341 elf_x86_64_info_to_howto (bfd *abfd, arelent *cache_ptr, 342 Elf_Internal_Rela *dst) 343 { 344 unsigned r_type; 345 346 r_type = ELF32_R_TYPE (dst->r_info); 347 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type); 348 if (cache_ptr->howto == NULL) 349 return FALSE; 350 BFD_ASSERT (r_type == cache_ptr->howto->type || cache_ptr->howto->type == R_X86_64_NONE); 351 return TRUE; 352 } 353 354 /* Support for core dump NOTE sections. */ 355 static bfd_boolean 356 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 357 { 358 int offset; 359 size_t size; 360 361 switch (note->descsz) 362 { 363 default: 364 return FALSE; 365 366 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */ 367 /* pr_cursig */ 368 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 369 370 /* pr_pid */ 371 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 372 373 /* pr_reg */ 374 offset = 72; 375 size = 216; 376 377 break; 378 379 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ 380 /* pr_cursig */ 381 elf_tdata (abfd)->core->signal 382 = bfd_get_16 (abfd, note->descdata + 12); 383 384 /* pr_pid */ 385 elf_tdata (abfd)->core->lwpid 386 = bfd_get_32 (abfd, note->descdata + 32); 387 388 /* pr_reg */ 389 offset = 112; 390 size = 216; 391 392 break; 393 } 394 395 /* Make a ".reg/999" section. */ 396 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 397 size, note->descpos + offset); 398 } 399 400 static bfd_boolean 401 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 402 { 403 switch (note->descsz) 404 { 405 default: 406 return FALSE; 407 408 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */ 409 elf_tdata (abfd)->core->pid 410 = bfd_get_32 (abfd, note->descdata + 12); 411 elf_tdata (abfd)->core->program 412 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 413 elf_tdata (abfd)->core->command 414 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 415 break; 416 417 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ 418 elf_tdata (abfd)->core->pid 419 = bfd_get_32 (abfd, note->descdata + 24); 420 elf_tdata (abfd)->core->program 421 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); 422 elf_tdata (abfd)->core->command 423 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); 424 } 425 426 /* Note that for some reason, a spurious space is tacked 427 onto the end of the args in some (at least one anyway) 428 implementations, so strip it off if it exists. */ 429 430 { 431 char *command = elf_tdata (abfd)->core->command; 432 int n = strlen (command); 433 434 if (0 < n && command[n - 1] == ' ') 435 command[n - 1] = '\0'; 436 } 437 438 return TRUE; 439 } 440 441 #ifdef CORE_HEADER 442 # if GCC_VERSION >= 8000 443 # pragma GCC diagnostic push 444 # pragma GCC diagnostic ignored "-Wstringop-truncation" 445 # endif 446 static char * 447 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz, 448 int note_type, ...) 449 { 450 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 451 va_list ap; 452 const char *fname, *psargs; 453 long pid; 454 int cursig; 455 const void *gregs; 456 457 switch (note_type) 458 { 459 default: 460 return NULL; 461 462 case NT_PRPSINFO: 463 va_start (ap, note_type); 464 fname = va_arg (ap, const char *); 465 psargs = va_arg (ap, const char *); 466 va_end (ap); 467 468 if (bed->s->elfclass == ELFCLASS32) 469 { 470 prpsinfo32_t data; 471 memset (&data, 0, sizeof (data)); 472 strncpy (data.pr_fname, fname, sizeof (data.pr_fname)); 473 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs)); 474 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 475 &data, sizeof (data)); 476 } 477 else 478 { 479 prpsinfo64_t data; 480 memset (&data, 0, sizeof (data)); 481 strncpy (data.pr_fname, fname, sizeof (data.pr_fname)); 482 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs)); 483 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 484 &data, sizeof (data)); 485 } 486 /* NOTREACHED */ 487 488 case NT_PRSTATUS: 489 va_start (ap, note_type); 490 pid = va_arg (ap, long); 491 cursig = va_arg (ap, int); 492 gregs = va_arg (ap, const void *); 493 va_end (ap); 494 495 if (bed->s->elfclass == ELFCLASS32) 496 { 497 if (bed->elf_machine_code == EM_X86_64) 498 { 499 prstatusx32_t prstat; 500 memset (&prstat, 0, sizeof (prstat)); 501 prstat.pr_pid = pid; 502 prstat.pr_cursig = cursig; 503 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); 504 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 505 &prstat, sizeof (prstat)); 506 } 507 else 508 { 509 prstatus32_t prstat; 510 memset (&prstat, 0, sizeof (prstat)); 511 prstat.pr_pid = pid; 512 prstat.pr_cursig = cursig; 513 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); 514 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 515 &prstat, sizeof (prstat)); 516 } 517 } 518 else 519 { 520 prstatus64_t prstat; 521 memset (&prstat, 0, sizeof (prstat)); 522 prstat.pr_pid = pid; 523 prstat.pr_cursig = cursig; 524 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); 525 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, 526 &prstat, sizeof (prstat)); 527 } 528 } 529 /* NOTREACHED */ 530 } 531 # if GCC_VERSION >= 8000 532 # pragma GCC diagnostic pop 533 # endif 534 #endif 535 536 /* Functions for the x86-64 ELF linker. */ 537 538 /* The size in bytes of an entry in the global offset table. */ 539 540 #define GOT_ENTRY_SIZE 8 541 542 /* The size in bytes of an entry in the lazy procedure linkage table. */ 543 544 #define LAZY_PLT_ENTRY_SIZE 16 545 546 /* The size in bytes of an entry in the non-lazy procedure linkage 547 table. */ 548 549 #define NON_LAZY_PLT_ENTRY_SIZE 8 550 551 /* The first entry in a lazy procedure linkage table looks like this. 552 See the SVR4 ABI i386 supplement and the x86-64 ABI to see how this 553 works. */ 554 555 static const bfd_byte elf_x86_64_lazy_plt0_entry[LAZY_PLT_ENTRY_SIZE] = 556 { 557 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ 558 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ 559 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ 560 }; 561 562 /* Subsequent entries in a lazy procedure linkage table look like this. */ 563 564 static const bfd_byte elf_x86_64_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] = 565 { 566 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ 567 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ 568 0x68, /* pushq immediate */ 569 0, 0, 0, 0, /* replaced with index into relocation table. */ 570 0xe9, /* jmp relative */ 571 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ 572 }; 573 574 /* The first entry in a lazy procedure linkage table with BND prefix 575 like this. */ 576 577 static const bfd_byte elf_x86_64_lazy_bnd_plt0_entry[LAZY_PLT_ENTRY_SIZE] = 578 { 579 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ 580 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */ 581 0x0f, 0x1f, 0 /* nopl (%rax) */ 582 }; 583 584 /* Subsequent entries for branches with BND prefx in a lazy procedure 585 linkage table look like this. */ 586 587 static const bfd_byte elf_x86_64_lazy_bnd_plt_entry[LAZY_PLT_ENTRY_SIZE] = 588 { 589 0x68, 0, 0, 0, 0, /* pushq immediate */ 590 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */ 591 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */ 592 }; 593 594 /* The first entry in the IBT-enabled lazy procedure linkage table is the 595 the same as the lazy PLT with BND prefix so that bound registers are 596 preserved when control is passed to dynamic linker. Subsequent 597 entries for a IBT-enabled lazy procedure linkage table look like 598 this. */ 599 600 static const bfd_byte elf_x86_64_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 601 { 602 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ 603 0x68, 0, 0, 0, 0, /* pushq immediate */ 604 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */ 605 0x90 /* nop */ 606 }; 607 608 /* The first entry in the x32 IBT-enabled lazy procedure linkage table 609 is the same as the normal lazy PLT. Subsequent entries for an 610 x32 IBT-enabled lazy procedure linkage table look like this. */ 611 612 static const bfd_byte elf_x32_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 613 { 614 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ 615 0x68, 0, 0, 0, 0, /* pushq immediate */ 616 0xe9, 0, 0, 0, 0, /* jmpq relative */ 617 0x66, 0x90 /* xchg %ax,%ax */ 618 }; 619 620 /* Entries in the non-lazey procedure linkage table look like this. */ 621 622 static const bfd_byte elf_x86_64_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = 623 { 624 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ 625 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ 626 0x66, 0x90 /* xchg %ax,%ax */ 627 }; 628 629 /* Entries for branches with BND prefix in the non-lazey procedure 630 linkage table look like this. */ 631 632 static const bfd_byte elf_x86_64_non_lazy_bnd_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = 633 { 634 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */ 635 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ 636 0x90 /* nop */ 637 }; 638 639 /* Entries for branches with IBT-enabled in the non-lazey procedure 640 linkage table look like this. They have the same size as the lazy 641 PLT entry. */ 642 643 static const bfd_byte elf_x86_64_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 644 { 645 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ 646 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */ 647 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ 648 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopl 0x0(%rax,%rax,1) */ 649 }; 650 651 /* Entries for branches with IBT-enabled in the x32 non-lazey procedure 652 linkage table look like this. They have the same size as the lazy 653 PLT entry. */ 654 655 static const bfd_byte elf_x32_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 656 { 657 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ 658 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ 659 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ 660 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */ 661 }; 662 663 /* The TLSDESC entry in a lazy procedure linkage table. */ 664 static const bfd_byte elf_x86_64_tlsdesc_plt_entry[LAZY_PLT_ENTRY_SIZE] = 665 { 666 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */ 667 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ 668 0xff, 0x25, 16, 0, 0, 0 /* jmpq *GOT+TDG(%rip) */ 669 }; 670 671 /* .eh_frame covering the lazy .plt section. */ 672 673 static const bfd_byte elf_x86_64_eh_frame_lazy_plt[] = 674 { 675 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 676 0, 0, 0, 0, /* CIE ID */ 677 1, /* CIE version */ 678 'z', 'R', 0, /* Augmentation string */ 679 1, /* Code alignment factor */ 680 0x78, /* Data alignment factor */ 681 16, /* Return address column */ 682 1, /* Augmentation size */ 683 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 684 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ 685 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ 686 DW_CFA_nop, DW_CFA_nop, 687 688 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 689 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 690 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ 691 0, 0, 0, 0, /* .plt size goes here */ 692 0, /* Augmentation size */ 693 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ 694 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 695 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ 696 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 697 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 698 11, /* Block length */ 699 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ 700 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ 701 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, 702 DW_OP_lit3, DW_OP_shl, DW_OP_plus, 703 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 704 }; 705 706 /* .eh_frame covering the lazy BND .plt section. */ 707 708 static const bfd_byte elf_x86_64_eh_frame_lazy_bnd_plt[] = 709 { 710 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 711 0, 0, 0, 0, /* CIE ID */ 712 1, /* CIE version */ 713 'z', 'R', 0, /* Augmentation string */ 714 1, /* Code alignment factor */ 715 0x78, /* Data alignment factor */ 716 16, /* Return address column */ 717 1, /* Augmentation size */ 718 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 719 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ 720 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ 721 DW_CFA_nop, DW_CFA_nop, 722 723 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 724 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 725 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ 726 0, 0, 0, 0, /* .plt size goes here */ 727 0, /* Augmentation size */ 728 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ 729 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 730 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ 731 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 732 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 733 11, /* Block length */ 734 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ 735 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ 736 DW_OP_lit15, DW_OP_and, DW_OP_lit5, DW_OP_ge, 737 DW_OP_lit3, DW_OP_shl, DW_OP_plus, 738 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 739 }; 740 741 /* .eh_frame covering the lazy .plt section with IBT-enabled. */ 742 743 static const bfd_byte elf_x86_64_eh_frame_lazy_ibt_plt[] = 744 { 745 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 746 0, 0, 0, 0, /* CIE ID */ 747 1, /* CIE version */ 748 'z', 'R', 0, /* Augmentation string */ 749 1, /* Code alignment factor */ 750 0x78, /* Data alignment factor */ 751 16, /* Return address column */ 752 1, /* Augmentation size */ 753 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 754 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ 755 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ 756 DW_CFA_nop, DW_CFA_nop, 757 758 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 759 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 760 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ 761 0, 0, 0, 0, /* .plt size goes here */ 762 0, /* Augmentation size */ 763 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ 764 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 765 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ 766 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 767 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 768 11, /* Block length */ 769 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ 770 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ 771 DW_OP_lit15, DW_OP_and, DW_OP_lit10, DW_OP_ge, 772 DW_OP_lit3, DW_OP_shl, DW_OP_plus, 773 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 774 }; 775 776 /* .eh_frame covering the x32 lazy .plt section with IBT-enabled. */ 777 778 static const bfd_byte elf_x32_eh_frame_lazy_ibt_plt[] = 779 { 780 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 781 0, 0, 0, 0, /* CIE ID */ 782 1, /* CIE version */ 783 'z', 'R', 0, /* Augmentation string */ 784 1, /* Code alignment factor */ 785 0x78, /* Data alignment factor */ 786 16, /* Return address column */ 787 1, /* Augmentation size */ 788 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 789 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ 790 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ 791 DW_CFA_nop, DW_CFA_nop, 792 793 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 794 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 795 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ 796 0, 0, 0, 0, /* .plt size goes here */ 797 0, /* Augmentation size */ 798 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ 799 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 800 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ 801 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 802 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 803 11, /* Block length */ 804 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ 805 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ 806 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge, 807 DW_OP_lit3, DW_OP_shl, DW_OP_plus, 808 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 809 }; 810 811 /* .eh_frame covering the non-lazy .plt section. */ 812 813 static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt[] = 814 { 815 #define PLT_GOT_FDE_LENGTH 20 816 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 817 0, 0, 0, 0, /* CIE ID */ 818 1, /* CIE version */ 819 'z', 'R', 0, /* Augmentation string */ 820 1, /* Code alignment factor */ 821 0x78, /* Data alignment factor */ 822 16, /* Return address column */ 823 1, /* Augmentation size */ 824 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 825 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ 826 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ 827 DW_CFA_nop, DW_CFA_nop, 828 829 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 830 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 831 0, 0, 0, 0, /* the start of non-lazy .plt goes here */ 832 0, 0, 0, 0, /* non-lazy .plt size goes here */ 833 0, /* Augmentation size */ 834 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, 835 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 836 }; 837 838 /* These are the standard parameters. */ 839 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt = 840 { 841 elf_x86_64_lazy_plt0_entry, /* plt0_entry */ 842 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ 843 elf_x86_64_lazy_plt_entry, /* plt_entry */ 844 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 845 elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ 846 LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ 847 6, /* plt_tlsdesc_got1_offset */ 848 12, /* plt_tlsdesc_got2_offset */ 849 10, /* plt_tlsdesc_got1_insn_end */ 850 16, /* plt_tlsdesc_got2_insn_end */ 851 2, /* plt0_got1_offset */ 852 8, /* plt0_got2_offset */ 853 12, /* plt0_got2_insn_end */ 854 2, /* plt_got_offset */ 855 7, /* plt_reloc_offset */ 856 12, /* plt_plt_offset */ 857 6, /* plt_got_insn_size */ 858 LAZY_PLT_ENTRY_SIZE, /* plt_plt_insn_end */ 859 6, /* plt_lazy_offset */ 860 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */ 861 elf_x86_64_lazy_plt_entry, /* pic_plt_entry */ 862 elf_x86_64_eh_frame_lazy_plt, /* eh_frame_plt */ 863 sizeof (elf_x86_64_eh_frame_lazy_plt) /* eh_frame_plt_size */ 864 }; 865 866 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_plt = 867 { 868 elf_x86_64_non_lazy_plt_entry, /* plt_entry */ 869 elf_x86_64_non_lazy_plt_entry, /* pic_plt_entry */ 870 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 871 2, /* plt_got_offset */ 872 6, /* plt_got_insn_size */ 873 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ 874 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 875 }; 876 877 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_bnd_plt = 878 { 879 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */ 880 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ 881 elf_x86_64_lazy_bnd_plt_entry, /* plt_entry */ 882 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 883 elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ 884 LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ 885 6, /* plt_tlsdesc_got1_offset */ 886 12, /* plt_tlsdesc_got2_offset */ 887 10, /* plt_tlsdesc_got1_insn_end */ 888 16, /* plt_tlsdesc_got2_insn_end */ 889 2, /* plt0_got1_offset */ 890 1+8, /* plt0_got2_offset */ 891 1+12, /* plt0_got2_insn_end */ 892 1+2, /* plt_got_offset */ 893 1, /* plt_reloc_offset */ 894 7, /* plt_plt_offset */ 895 1+6, /* plt_got_insn_size */ 896 11, /* plt_plt_insn_end */ 897 0, /* plt_lazy_offset */ 898 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */ 899 elf_x86_64_lazy_bnd_plt_entry, /* pic_plt_entry */ 900 elf_x86_64_eh_frame_lazy_bnd_plt, /* eh_frame_plt */ 901 sizeof (elf_x86_64_eh_frame_lazy_bnd_plt) /* eh_frame_plt_size */ 902 }; 903 904 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_bnd_plt = 905 { 906 elf_x86_64_non_lazy_bnd_plt_entry, /* plt_entry */ 907 elf_x86_64_non_lazy_bnd_plt_entry, /* pic_plt_entry */ 908 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 909 1+2, /* plt_got_offset */ 910 1+6, /* plt_got_insn_size */ 911 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ 912 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 913 }; 914 915 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_ibt_plt = 916 { 917 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */ 918 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ 919 elf_x86_64_lazy_ibt_plt_entry, /* plt_entry */ 920 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 921 elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ 922 LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ 923 6, /* plt_tlsdesc_got1_offset */ 924 12, /* plt_tlsdesc_got2_offset */ 925 10, /* plt_tlsdesc_got1_insn_end */ 926 16, /* plt_tlsdesc_got2_insn_end */ 927 2, /* plt0_got1_offset */ 928 1+8, /* plt0_got2_offset */ 929 1+12, /* plt0_got2_insn_end */ 930 4+1+2, /* plt_got_offset */ 931 4+1, /* plt_reloc_offset */ 932 4+1+6, /* plt_plt_offset */ 933 4+1+6, /* plt_got_insn_size */ 934 4+1+5+5, /* plt_plt_insn_end */ 935 0, /* plt_lazy_offset */ 936 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */ 937 elf_x86_64_lazy_ibt_plt_entry, /* pic_plt_entry */ 938 elf_x86_64_eh_frame_lazy_ibt_plt, /* eh_frame_plt */ 939 sizeof (elf_x86_64_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */ 940 }; 941 942 static const struct elf_x86_lazy_plt_layout elf_x32_lazy_ibt_plt = 943 { 944 elf_x86_64_lazy_plt0_entry, /* plt0_entry */ 945 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */ 946 elf_x32_lazy_ibt_plt_entry, /* plt_entry */ 947 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 948 elf_x86_64_tlsdesc_plt_entry, /* plt_tlsdesc_entry */ 949 LAZY_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ 950 6, /* plt_tlsdesc_got1_offset */ 951 12, /* plt_tlsdesc_got2_offset */ 952 10, /* plt_tlsdesc_got1_insn_end */ 953 16, /* plt_tlsdesc_got2_insn_end */ 954 2, /* plt0_got1_offset */ 955 8, /* plt0_got2_offset */ 956 12, /* plt0_got2_insn_end */ 957 4+2, /* plt_got_offset */ 958 4+1, /* plt_reloc_offset */ 959 4+6, /* plt_plt_offset */ 960 4+6, /* plt_got_insn_size */ 961 4+5+5, /* plt_plt_insn_end */ 962 0, /* plt_lazy_offset */ 963 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */ 964 elf_x32_lazy_ibt_plt_entry, /* pic_plt_entry */ 965 elf_x32_eh_frame_lazy_ibt_plt, /* eh_frame_plt */ 966 sizeof (elf_x32_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */ 967 }; 968 969 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_ibt_plt = 970 { 971 elf_x86_64_non_lazy_ibt_plt_entry, /* plt_entry */ 972 elf_x86_64_non_lazy_ibt_plt_entry, /* pic_plt_entry */ 973 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 974 4+1+2, /* plt_got_offset */ 975 4+1+6, /* plt_got_insn_size */ 976 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ 977 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 978 }; 979 980 static const struct elf_x86_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt = 981 { 982 elf_x32_non_lazy_ibt_plt_entry, /* plt_entry */ 983 elf_x32_non_lazy_ibt_plt_entry, /* pic_plt_entry */ 984 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 985 4+2, /* plt_got_offset */ 986 4+6, /* plt_got_insn_size */ 987 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */ 988 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 989 }; 990 991 static const struct elf_x86_backend_data elf_x86_64_arch_bed = 992 { 993 is_normal /* os */ 994 }; 995 996 #define elf_backend_arch_data &elf_x86_64_arch_bed 997 998 static bfd_boolean 999 elf64_x86_64_elf_object_p (bfd *abfd) 1000 { 1001 /* Set the right machine number for an x86-64 elf64 file. */ 1002 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); 1003 return TRUE; 1004 } 1005 1006 static bfd_boolean 1007 elf32_x86_64_elf_object_p (bfd *abfd) 1008 { 1009 /* Set the right machine number for an x86-64 elf32 file. */ 1010 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32); 1011 return TRUE; 1012 } 1013 1014 /* Return TRUE if the TLS access code sequence support transition 1015 from R_TYPE. */ 1016 1017 static bfd_boolean 1018 elf_x86_64_check_tls_transition (bfd *abfd, 1019 struct bfd_link_info *info, 1020 asection *sec, 1021 bfd_byte *contents, 1022 Elf_Internal_Shdr *symtab_hdr, 1023 struct elf_link_hash_entry **sym_hashes, 1024 unsigned int r_type, 1025 const Elf_Internal_Rela *rel, 1026 const Elf_Internal_Rela *relend) 1027 { 1028 unsigned int val; 1029 unsigned long r_symndx; 1030 bfd_boolean largepic = FALSE; 1031 struct elf_link_hash_entry *h; 1032 bfd_vma offset; 1033 struct elf_x86_link_hash_table *htab; 1034 bfd_byte *call; 1035 bfd_boolean indirect_call; 1036 1037 htab = elf_x86_hash_table (info, X86_64_ELF_DATA); 1038 offset = rel->r_offset; 1039 switch (r_type) 1040 { 1041 case R_X86_64_TLSGD: 1042 case R_X86_64_TLSLD: 1043 if ((rel + 1) >= relend) 1044 return FALSE; 1045 1046 if (r_type == R_X86_64_TLSGD) 1047 { 1048 /* Check transition from GD access model. For 64bit, only 1049 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 1050 .word 0x6666; rex64; call __tls_get_addr@PLT 1051 or 1052 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 1053 .byte 0x66; rex64 1054 call *__tls_get_addr@GOTPCREL(%rip) 1055 which may be converted to 1056 addr32 call __tls_get_addr 1057 can transit to different access model. For 32bit, only 1058 leaq foo@tlsgd(%rip), %rdi 1059 .word 0x6666; rex64; call __tls_get_addr@PLT 1060 or 1061 leaq foo@tlsgd(%rip), %rdi 1062 .byte 0x66; rex64 1063 call *__tls_get_addr@GOTPCREL(%rip) 1064 which may be converted to 1065 addr32 call __tls_get_addr 1066 can transit to different access model. For largepic, 1067 we also support: 1068 leaq foo@tlsgd(%rip), %rdi 1069 movabsq $__tls_get_addr@pltoff, %rax 1070 addq $r15, %rax 1071 call *%rax 1072 or 1073 leaq foo@tlsgd(%rip), %rdi 1074 movabsq $__tls_get_addr@pltoff, %rax 1075 addq $rbx, %rax 1076 call *%rax */ 1077 1078 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d }; 1079 1080 if ((offset + 12) > sec->size) 1081 return FALSE; 1082 1083 call = contents + offset + 4; 1084 if (call[0] != 0x66 1085 || !((call[1] == 0x48 1086 && call[2] == 0xff 1087 && call[3] == 0x15) 1088 || (call[1] == 0x48 1089 && call[2] == 0x67 1090 && call[3] == 0xe8) 1091 || (call[1] == 0x66 1092 && call[2] == 0x48 1093 && call[3] == 0xe8))) 1094 { 1095 if (!ABI_64_P (abfd) 1096 || (offset + 19) > sec->size 1097 || offset < 3 1098 || memcmp (call - 7, leaq + 1, 3) != 0 1099 || memcmp (call, "\x48\xb8", 2) != 0 1100 || call[11] != 0x01 1101 || call[13] != 0xff 1102 || call[14] != 0xd0 1103 || !((call[10] == 0x48 && call[12] == 0xd8) 1104 || (call[10] == 0x4c && call[12] == 0xf8))) 1105 return FALSE; 1106 largepic = TRUE; 1107 } 1108 else if (ABI_64_P (abfd)) 1109 { 1110 if (offset < 4 1111 || memcmp (contents + offset - 4, leaq, 4) != 0) 1112 return FALSE; 1113 } 1114 else 1115 { 1116 if (offset < 3 1117 || memcmp (contents + offset - 3, leaq + 1, 3) != 0) 1118 return FALSE; 1119 } 1120 indirect_call = call[2] == 0xff; 1121 } 1122 else 1123 { 1124 /* Check transition from LD access model. Only 1125 leaq foo@tlsld(%rip), %rdi; 1126 call __tls_get_addr@PLT 1127 or 1128 leaq foo@tlsld(%rip), %rdi; 1129 call *__tls_get_addr@GOTPCREL(%rip) 1130 which may be converted to 1131 addr32 call __tls_get_addr 1132 can transit to different access model. For largepic 1133 we also support: 1134 leaq foo@tlsld(%rip), %rdi 1135 movabsq $__tls_get_addr@pltoff, %rax 1136 addq $r15, %rax 1137 call *%rax 1138 or 1139 leaq foo@tlsld(%rip), %rdi 1140 movabsq $__tls_get_addr@pltoff, %rax 1141 addq $rbx, %rax 1142 call *%rax */ 1143 1144 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d }; 1145 1146 if (offset < 3 || (offset + 9) > sec->size) 1147 return FALSE; 1148 1149 if (memcmp (contents + offset - 3, lea, 3) != 0) 1150 return FALSE; 1151 1152 call = contents + offset + 4; 1153 if (!(call[0] == 0xe8 1154 || (call[0] == 0xff && call[1] == 0x15) 1155 || (call[0] == 0x67 && call[1] == 0xe8))) 1156 { 1157 if (!ABI_64_P (abfd) 1158 || (offset + 19) > sec->size 1159 || memcmp (call, "\x48\xb8", 2) != 0 1160 || call[11] != 0x01 1161 || call[13] != 0xff 1162 || call[14] != 0xd0 1163 || !((call[10] == 0x48 && call[12] == 0xd8) 1164 || (call[10] == 0x4c && call[12] == 0xf8))) 1165 return FALSE; 1166 largepic = TRUE; 1167 } 1168 indirect_call = call[0] == 0xff; 1169 } 1170 1171 r_symndx = htab->r_sym (rel[1].r_info); 1172 if (r_symndx < symtab_hdr->sh_info) 1173 return FALSE; 1174 1175 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1176 if (h == NULL 1177 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr) 1178 return FALSE; 1179 else 1180 { 1181 r_type = (ELF32_R_TYPE (rel[1].r_info) 1182 & ~R_X86_64_converted_reloc_bit); 1183 if (largepic) 1184 return r_type == R_X86_64_PLTOFF64; 1185 else if (indirect_call) 1186 return r_type == R_X86_64_GOTPCRELX; 1187 else 1188 return (r_type == R_X86_64_PC32 || r_type == R_X86_64_PLT32); 1189 } 1190 1191 case R_X86_64_GOTTPOFF: 1192 /* Check transition from IE access model: 1193 mov foo@gottpoff(%rip), %reg 1194 add foo@gottpoff(%rip), %reg 1195 */ 1196 1197 /* Check REX prefix first. */ 1198 if (offset >= 3 && (offset + 4) <= sec->size) 1199 { 1200 val = bfd_get_8 (abfd, contents + offset - 3); 1201 if (val != 0x48 && val != 0x4c) 1202 { 1203 /* X32 may have 0x44 REX prefix or no REX prefix. */ 1204 if (ABI_64_P (abfd)) 1205 return FALSE; 1206 } 1207 } 1208 else 1209 { 1210 /* X32 may not have any REX prefix. */ 1211 if (ABI_64_P (abfd)) 1212 return FALSE; 1213 if (offset < 2 || (offset + 3) > sec->size) 1214 return FALSE; 1215 } 1216 1217 val = bfd_get_8 (abfd, contents + offset - 2); 1218 if (val != 0x8b && val != 0x03) 1219 return FALSE; 1220 1221 val = bfd_get_8 (abfd, contents + offset - 1); 1222 return (val & 0xc7) == 5; 1223 1224 case R_X86_64_GOTPC32_TLSDESC: 1225 /* Check transition from GDesc access model: 1226 leaq x@tlsdesc(%rip), %rax 1227 1228 Make sure it's a leaq adding rip to a 32-bit offset 1229 into any register, although it's probably almost always 1230 going to be rax. */ 1231 1232 if (offset < 3 || (offset + 4) > sec->size) 1233 return FALSE; 1234 1235 val = bfd_get_8 (abfd, contents + offset - 3); 1236 if ((val & 0xfb) != 0x48) 1237 return FALSE; 1238 1239 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) 1240 return FALSE; 1241 1242 val = bfd_get_8 (abfd, contents + offset - 1); 1243 return (val & 0xc7) == 0x05; 1244 1245 case R_X86_64_TLSDESC_CALL: 1246 /* Check transition from GDesc access model: 1247 call *x@tlsdesc(%rax) 1248 */ 1249 if (offset + 2 <= sec->size) 1250 { 1251 /* Make sure that it's a call *x@tlsdesc(%rax). */ 1252 call = contents + offset; 1253 return call[0] == 0xff && call[1] == 0x10; 1254 } 1255 1256 return FALSE; 1257 1258 default: 1259 abort (); 1260 } 1261 } 1262 1263 /* Return TRUE if the TLS access transition is OK or no transition 1264 will be performed. Update R_TYPE if there is a transition. */ 1265 1266 static bfd_boolean 1267 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd, 1268 asection *sec, bfd_byte *contents, 1269 Elf_Internal_Shdr *symtab_hdr, 1270 struct elf_link_hash_entry **sym_hashes, 1271 unsigned int *r_type, int tls_type, 1272 const Elf_Internal_Rela *rel, 1273 const Elf_Internal_Rela *relend, 1274 struct elf_link_hash_entry *h, 1275 unsigned long r_symndx, 1276 bfd_boolean from_relocate_section) 1277 { 1278 unsigned int from_type = *r_type; 1279 unsigned int to_type = from_type; 1280 bfd_boolean check = TRUE; 1281 1282 /* Skip TLS transition for functions. */ 1283 if (h != NULL 1284 && (h->type == STT_FUNC 1285 || h->type == STT_GNU_IFUNC)) 1286 return TRUE; 1287 1288 switch (from_type) 1289 { 1290 case R_X86_64_TLSGD: 1291 case R_X86_64_GOTPC32_TLSDESC: 1292 case R_X86_64_TLSDESC_CALL: 1293 case R_X86_64_GOTTPOFF: 1294 if (bfd_link_executable (info)) 1295 { 1296 if (h == NULL) 1297 to_type = R_X86_64_TPOFF32; 1298 else 1299 to_type = R_X86_64_GOTTPOFF; 1300 } 1301 1302 /* When we are called from elf_x86_64_relocate_section, there may 1303 be additional transitions based on TLS_TYPE. */ 1304 if (from_relocate_section) 1305 { 1306 unsigned int new_to_type = to_type; 1307 1308 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type)) 1309 new_to_type = R_X86_64_TPOFF32; 1310 1311 if (to_type == R_X86_64_TLSGD 1312 || to_type == R_X86_64_GOTPC32_TLSDESC 1313 || to_type == R_X86_64_TLSDESC_CALL) 1314 { 1315 if (tls_type == GOT_TLS_IE) 1316 new_to_type = R_X86_64_GOTTPOFF; 1317 } 1318 1319 /* We checked the transition before when we were called from 1320 elf_x86_64_check_relocs. We only want to check the new 1321 transition which hasn't been checked before. */ 1322 check = new_to_type != to_type && from_type == to_type; 1323 to_type = new_to_type; 1324 } 1325 1326 break; 1327 1328 case R_X86_64_TLSLD: 1329 if (bfd_link_executable (info)) 1330 to_type = R_X86_64_TPOFF32; 1331 break; 1332 1333 default: 1334 return TRUE; 1335 } 1336 1337 /* Return TRUE if there is no transition. */ 1338 if (from_type == to_type) 1339 return TRUE; 1340 1341 /* Check if the transition can be performed. */ 1342 if (check 1343 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents, 1344 symtab_hdr, sym_hashes, 1345 from_type, rel, relend)) 1346 { 1347 reloc_howto_type *from, *to; 1348 const char *name; 1349 1350 from = elf_x86_64_rtype_to_howto (abfd, from_type); 1351 to = elf_x86_64_rtype_to_howto (abfd, to_type); 1352 1353 if (from == NULL || to == NULL) 1354 return FALSE; 1355 1356 if (h) 1357 name = h->root.root.string; 1358 else 1359 { 1360 struct elf_x86_link_hash_table *htab; 1361 1362 htab = elf_x86_hash_table (info, X86_64_ELF_DATA); 1363 if (htab == NULL) 1364 name = "*unknown*"; 1365 else 1366 { 1367 Elf_Internal_Sym *isym; 1368 1369 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1370 abfd, r_symndx); 1371 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); 1372 } 1373 } 1374 1375 _bfd_error_handler 1376 /* xgettext:c-format */ 1377 (_("%pB: TLS transition from %s to %s against `%s' at %#" PRIx64 1378 " in section `%pA' failed"), 1379 abfd, from->name, to->name, name, (uint64_t) rel->r_offset, sec); 1380 bfd_set_error (bfd_error_bad_value); 1381 return FALSE; 1382 } 1383 1384 *r_type = to_type; 1385 return TRUE; 1386 } 1387 1388 /* Rename some of the generic section flags to better document how they 1389 are used here. */ 1390 #define check_relocs_failed sec_flg0 1391 1392 static bfd_boolean 1393 elf_x86_64_need_pic (struct bfd_link_info *info, 1394 bfd *input_bfd, asection *sec, 1395 struct elf_link_hash_entry *h, 1396 Elf_Internal_Shdr *symtab_hdr, 1397 Elf_Internal_Sym *isym, 1398 reloc_howto_type *howto) 1399 { 1400 const char *v = ""; 1401 const char *und = ""; 1402 const char *pic = ""; 1403 const char *object; 1404 1405 const char *name; 1406 if (h) 1407 { 1408 name = h->root.root.string; 1409 switch (ELF_ST_VISIBILITY (h->other)) 1410 { 1411 case STV_HIDDEN: 1412 v = _("hidden symbol "); 1413 break; 1414 case STV_INTERNAL: 1415 v = _("internal symbol "); 1416 break; 1417 case STV_PROTECTED: 1418 v = _("protected symbol "); 1419 break; 1420 default: 1421 if (((struct elf_x86_link_hash_entry *) h)->def_protected) 1422 v = _("protected symbol "); 1423 else 1424 v = _("symbol "); 1425 pic = _("; recompile with -fPIC"); 1426 break; 1427 } 1428 1429 if (!SYMBOL_DEFINED_NON_SHARED_P (h) && !h->def_dynamic) 1430 und = _("undefined "); 1431 } 1432 else 1433 { 1434 name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL); 1435 pic = _("; recompile with -fPIC"); 1436 } 1437 1438 if (bfd_link_dll (info)) 1439 object = _("a shared object"); 1440 else if (bfd_link_pie (info)) 1441 object = _("a PIE object"); 1442 else 1443 object = _("a PDE object"); 1444 1445 /* xgettext:c-format */ 1446 _bfd_error_handler (_("%pB: relocation %s against %s%s`%s' can " 1447 "not be used when making %s%s"), 1448 input_bfd, howto->name, und, v, name, 1449 object, pic); 1450 bfd_set_error (bfd_error_bad_value); 1451 sec->check_relocs_failed = 1; 1452 return FALSE; 1453 } 1454 1455 /* With the local symbol, foo, we convert 1456 mov foo@GOTPCREL(%rip), %reg 1457 to 1458 lea foo(%rip), %reg 1459 and convert 1460 call/jmp *foo@GOTPCREL(%rip) 1461 to 1462 nop call foo/jmp foo nop 1463 When PIC is false, convert 1464 test %reg, foo@GOTPCREL(%rip) 1465 to 1466 test $foo, %reg 1467 and convert 1468 binop foo@GOTPCREL(%rip), %reg 1469 to 1470 binop $foo, %reg 1471 where binop is one of adc, add, and, cmp, or, sbb, sub, xor 1472 instructions. */ 1473 1474 static bfd_boolean 1475 elf_x86_64_convert_load_reloc (bfd *abfd, 1476 bfd_byte *contents, 1477 unsigned int *r_type_p, 1478 Elf_Internal_Rela *irel, 1479 struct elf_link_hash_entry *h, 1480 bfd_boolean *converted, 1481 struct bfd_link_info *link_info) 1482 { 1483 struct elf_x86_link_hash_table *htab; 1484 bfd_boolean is_pic; 1485 bfd_boolean no_overflow; 1486 bfd_boolean relocx; 1487 bfd_boolean to_reloc_pc32; 1488 asection *tsec; 1489 bfd_signed_vma raddend; 1490 unsigned int opcode; 1491 unsigned int modrm; 1492 unsigned int r_type = *r_type_p; 1493 unsigned int r_symndx; 1494 bfd_vma roff = irel->r_offset; 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 /* Get the symbol referred to by the reloc. */ 1539 if (h == NULL) 1540 { 1541 Elf_Internal_Sym *isym 1542 = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx); 1543 1544 /* Skip relocation against undefined symbols. */ 1545 if (isym->st_shndx == SHN_UNDEF) 1546 return TRUE; 1547 1548 if (isym->st_shndx == SHN_ABS) 1549 tsec = bfd_abs_section_ptr; 1550 else if (isym->st_shndx == SHN_COMMON) 1551 tsec = bfd_com_section_ptr; 1552 else if (isym->st_shndx == SHN_X86_64_LCOMMON) 1553 tsec = &_bfd_elf_large_com_section; 1554 else 1555 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx); 1556 } 1557 else 1558 { 1559 /* Undefined weak symbol is only bound locally in executable 1560 and its reference is resolved as 0 without relocation 1561 overflow. We can only perform this optimization for 1562 GOTPCRELX relocations since we need to modify REX byte. 1563 It is OK convert mov with R_X86_64_GOTPCREL to 1564 R_X86_64_PC32. */ 1565 bfd_boolean local_ref; 1566 struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h); 1567 1568 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */ 1569 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h); 1570 if ((relocx || opcode == 0x8b) 1571 && (h->root.type == bfd_link_hash_undefweak 1572 && !eh->linker_def 1573 && local_ref)) 1574 { 1575 if (opcode == 0xff) 1576 { 1577 /* Skip for branch instructions since R_X86_64_PC32 1578 may overflow. */ 1579 if (no_overflow) 1580 return TRUE; 1581 } 1582 else if (relocx) 1583 { 1584 /* For non-branch instructions, we can convert to 1585 R_X86_64_32/R_X86_64_32S since we know if there 1586 is a REX byte. */ 1587 to_reloc_pc32 = FALSE; 1588 } 1589 1590 /* Since we don't know the current PC when PIC is true, 1591 we can't convert to R_X86_64_PC32. */ 1592 if (to_reloc_pc32 && is_pic) 1593 return TRUE; 1594 1595 goto convert; 1596 } 1597 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since 1598 ld.so may use its link-time address. */ 1599 else if (h->start_stop 1600 || eh->linker_def 1601 || ((h->def_regular 1602 || h->root.type == bfd_link_hash_defined 1603 || h->root.type == bfd_link_hash_defweak) 1604 && h != htab->elf.hdynamic 1605 && local_ref)) 1606 { 1607 /* bfd_link_hash_new or bfd_link_hash_undefined is 1608 set by an assignment in a linker script in 1609 bfd_elf_record_link_assignment. start_stop is set 1610 on __start_SECNAME/__stop_SECNAME which mark section 1611 SECNAME. */ 1612 if (h->start_stop 1613 || eh->linker_def 1614 || (h->def_regular 1615 && (h->root.type == bfd_link_hash_new 1616 || h->root.type == bfd_link_hash_undefined 1617 || ((h->root.type == bfd_link_hash_defined 1618 || h->root.type == bfd_link_hash_defweak) 1619 && h->root.u.def.section == bfd_und_section_ptr)))) 1620 { 1621 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */ 1622 if (no_overflow) 1623 return TRUE; 1624 goto convert; 1625 } 1626 tsec = h->root.u.def.section; 1627 } 1628 else 1629 return TRUE; 1630 } 1631 1632 /* Don't convert GOTPCREL relocation against large section. */ 1633 if (elf_section_data (tsec) != NULL 1634 && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0) 1635 return TRUE; 1636 1637 /* Skip since R_X86_64_PC32/R_X86_64_32/R_X86_64_32S may overflow. */ 1638 if (no_overflow) 1639 return TRUE; 1640 1641 convert: 1642 if (opcode == 0xff) 1643 { 1644 /* We have "call/jmp *foo@GOTPCREL(%rip)". */ 1645 unsigned int nop; 1646 unsigned int disp; 1647 bfd_vma nop_offset; 1648 1649 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to 1650 R_X86_64_PC32. */ 1651 modrm = bfd_get_8 (abfd, contents + roff - 1); 1652 if (modrm == 0x25) 1653 { 1654 /* Convert to "jmp foo nop". */ 1655 modrm = 0xe9; 1656 nop = NOP_OPCODE; 1657 nop_offset = irel->r_offset + 3; 1658 disp = bfd_get_32 (abfd, contents + irel->r_offset); 1659 irel->r_offset -= 1; 1660 bfd_put_32 (abfd, disp, contents + irel->r_offset); 1661 } 1662 else 1663 { 1664 struct elf_x86_link_hash_entry *eh 1665 = (struct elf_x86_link_hash_entry *) h; 1666 1667 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE 1668 is a nop prefix. */ 1669 modrm = 0xe8; 1670 /* To support TLS optimization, always use addr32 prefix for 1671 "call *__tls_get_addr@GOTPCREL(%rip)". */ 1672 if (eh && eh->tls_get_addr) 1673 { 1674 nop = 0x67; 1675 nop_offset = irel->r_offset - 2; 1676 } 1677 else 1678 { 1679 nop = link_info->call_nop_byte; 1680 if (link_info->call_nop_as_suffix) 1681 { 1682 nop_offset = irel->r_offset + 3; 1683 disp = bfd_get_32 (abfd, contents + irel->r_offset); 1684 irel->r_offset -= 1; 1685 bfd_put_32 (abfd, disp, contents + irel->r_offset); 1686 } 1687 else 1688 nop_offset = irel->r_offset - 2; 1689 } 1690 } 1691 bfd_put_8 (abfd, nop, contents + nop_offset); 1692 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1); 1693 r_type = R_X86_64_PC32; 1694 } 1695 else 1696 { 1697 unsigned int rex; 1698 unsigned int rex_mask = REX_R; 1699 1700 if (r_type == R_X86_64_REX_GOTPCRELX) 1701 rex = bfd_get_8 (abfd, contents + roff - 3); 1702 else 1703 rex = 0; 1704 1705 if (opcode == 0x8b) 1706 { 1707 if (to_reloc_pc32) 1708 { 1709 /* Convert "mov foo@GOTPCREL(%rip), %reg" to 1710 "lea foo(%rip), %reg". */ 1711 opcode = 0x8d; 1712 r_type = R_X86_64_PC32; 1713 } 1714 else 1715 { 1716 /* Convert "mov foo@GOTPCREL(%rip), %reg" to 1717 "mov $foo, %reg". */ 1718 opcode = 0xc7; 1719 modrm = bfd_get_8 (abfd, contents + roff - 1); 1720 modrm = 0xc0 | (modrm & 0x38) >> 3; 1721 if ((rex & REX_W) != 0 1722 && ABI_64_P (link_info->output_bfd)) 1723 { 1724 /* Keep the REX_W bit in REX byte for LP64. */ 1725 r_type = R_X86_64_32S; 1726 goto rewrite_modrm_rex; 1727 } 1728 else 1729 { 1730 /* If the REX_W bit in REX byte isn't needed, 1731 use R_X86_64_32 and clear the W bit to avoid 1732 sign-extend imm32 to imm64. */ 1733 r_type = R_X86_64_32; 1734 /* Clear the W bit in REX byte. */ 1735 rex_mask |= REX_W; 1736 goto rewrite_modrm_rex; 1737 } 1738 } 1739 } 1740 else 1741 { 1742 /* R_X86_64_PC32 isn't supported. */ 1743 if (to_reloc_pc32) 1744 return TRUE; 1745 1746 modrm = bfd_get_8 (abfd, contents + roff - 1); 1747 if (opcode == 0x85) 1748 { 1749 /* Convert "test %reg, foo@GOTPCREL(%rip)" to 1750 "test $foo, %reg". */ 1751 modrm = 0xc0 | (modrm & 0x38) >> 3; 1752 opcode = 0xf7; 1753 } 1754 else 1755 { 1756 /* Convert "binop foo@GOTPCREL(%rip), %reg" to 1757 "binop $foo, %reg". */ 1758 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c); 1759 opcode = 0x81; 1760 } 1761 1762 /* Use R_X86_64_32 with 32-bit operand to avoid relocation 1763 overflow when sign-extending imm32 to imm64. */ 1764 r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32; 1765 1766 rewrite_modrm_rex: 1767 bfd_put_8 (abfd, modrm, contents + roff - 1); 1768 1769 if (rex) 1770 { 1771 /* Move the R bit to the B bit in REX byte. */ 1772 rex = (rex & ~rex_mask) | (rex & REX_R) >> 2; 1773 bfd_put_8 (abfd, rex, contents + roff - 3); 1774 } 1775 1776 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */ 1777 irel->r_addend = 0; 1778 } 1779 1780 bfd_put_8 (abfd, opcode, contents + roff - 2); 1781 } 1782 1783 *r_type_p = r_type; 1784 irel->r_info = htab->r_info (r_symndx, 1785 r_type | R_X86_64_converted_reloc_bit); 1786 1787 *converted = TRUE; 1788 1789 return TRUE; 1790 } 1791 1792 /* Look through the relocs for a section during the first phase, and 1793 calculate needed space in the global offset table, procedure 1794 linkage table, and dynamic reloc sections. */ 1795 1796 static bfd_boolean 1797 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, 1798 asection *sec, 1799 const Elf_Internal_Rela *relocs) 1800 { 1801 struct elf_x86_link_hash_table *htab; 1802 Elf_Internal_Shdr *symtab_hdr; 1803 struct elf_link_hash_entry **sym_hashes; 1804 const Elf_Internal_Rela *rel; 1805 const Elf_Internal_Rela *rel_end; 1806 asection *sreloc; 1807 bfd_byte *contents; 1808 bfd_boolean converted; 1809 1810 if (bfd_link_relocatable (info)) 1811 return TRUE; 1812 1813 /* Don't do anything special with non-loaded, non-alloced sections. 1814 In particular, any relocs in such sections should not affect GOT 1815 and PLT reference counting (ie. we don't allow them to create GOT 1816 or PLT entries), there's no possibility or desire to optimize TLS 1817 relocs, and there's not much point in propagating relocs to shared 1818 libs that the dynamic linker won't relocate. */ 1819 if ((sec->flags & SEC_ALLOC) == 0) 1820 return TRUE; 1821 1822 htab = elf_x86_hash_table (info, X86_64_ELF_DATA); 1823 if (htab == NULL) 1824 { 1825 sec->check_relocs_failed = 1; 1826 return FALSE; 1827 } 1828 1829 BFD_ASSERT (is_x86_elf (abfd, htab)); 1830 1831 /* Get the section contents. */ 1832 if (elf_section_data (sec)->this_hdr.contents != NULL) 1833 contents = elf_section_data (sec)->this_hdr.contents; 1834 else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1835 { 1836 sec->check_relocs_failed = 1; 1837 return FALSE; 1838 } 1839 1840 symtab_hdr = &elf_symtab_hdr (abfd); 1841 sym_hashes = elf_sym_hashes (abfd); 1842 1843 converted = FALSE; 1844 1845 sreloc = NULL; 1846 1847 rel_end = relocs + sec->reloc_count; 1848 for (rel = relocs; rel < rel_end; rel++) 1849 { 1850 unsigned int r_type; 1851 unsigned int r_symndx; 1852 struct elf_link_hash_entry *h; 1853 struct elf_x86_link_hash_entry *eh; 1854 Elf_Internal_Sym *isym; 1855 const char *name; 1856 bfd_boolean size_reloc; 1857 bfd_boolean converted_reloc; 1858 bfd_boolean do_check_pic; 1859 1860 r_symndx = htab->r_sym (rel->r_info); 1861 r_type = ELF32_R_TYPE (rel->r_info); 1862 1863 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 1864 { 1865 /* xgettext:c-format */ 1866 _bfd_error_handler (_("%pB: bad symbol index: %d"), 1867 abfd, r_symndx); 1868 goto error_return; 1869 } 1870 1871 if (r_symndx < symtab_hdr->sh_info) 1872 { 1873 /* A local symbol. */ 1874 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1875 abfd, r_symndx); 1876 if (isym == NULL) 1877 goto error_return; 1878 1879 /* Check relocation against local STT_GNU_IFUNC symbol. */ 1880 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1881 { 1882 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, 1883 TRUE); 1884 if (h == NULL) 1885 goto error_return; 1886 1887 /* Fake a STT_GNU_IFUNC symbol. */ 1888 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr, 1889 isym, NULL); 1890 h->type = STT_GNU_IFUNC; 1891 h->def_regular = 1; 1892 h->ref_regular = 1; 1893 h->forced_local = 1; 1894 h->root.type = bfd_link_hash_defined; 1895 } 1896 else 1897 h = NULL; 1898 } 1899 else 1900 { 1901 isym = NULL; 1902 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1903 while (h->root.type == bfd_link_hash_indirect 1904 || h->root.type == bfd_link_hash_warning) 1905 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1906 } 1907 1908 /* Check invalid x32 relocations. */ 1909 if (!ABI_64_P (abfd)) 1910 switch (r_type) 1911 { 1912 default: 1913 break; 1914 1915 case R_X86_64_DTPOFF64: 1916 case R_X86_64_TPOFF64: 1917 case R_X86_64_PC64: 1918 case R_X86_64_GOTOFF64: 1919 case R_X86_64_GOT64: 1920 case R_X86_64_GOTPCREL64: 1921 case R_X86_64_GOTPC64: 1922 case R_X86_64_GOTPLT64: 1923 case R_X86_64_PLTOFF64: 1924 { 1925 if (h) 1926 name = h->root.root.string; 1927 else 1928 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, 1929 NULL); 1930 _bfd_error_handler 1931 /* xgettext:c-format */ 1932 (_("%pB: relocation %s against symbol `%s' isn't " 1933 "supported in x32 mode"), abfd, 1934 x86_64_elf_howto_table[r_type].name, name); 1935 bfd_set_error (bfd_error_bad_value); 1936 goto error_return; 1937 } 1938 break; 1939 } 1940 1941 if (h != NULL) 1942 { 1943 /* It is referenced by a non-shared object. */ 1944 h->ref_regular = 1; 1945 1946 if (h->type == STT_GNU_IFUNC) 1947 elf_tdata (info->output_bfd)->has_gnu_symbols 1948 |= elf_gnu_symbol_ifunc; 1949 } 1950 1951 converted_reloc = FALSE; 1952 if ((r_type == R_X86_64_GOTPCREL 1953 || r_type == R_X86_64_GOTPCRELX 1954 || r_type == R_X86_64_REX_GOTPCRELX) 1955 && (h == NULL || h->type != STT_GNU_IFUNC)) 1956 { 1957 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel; 1958 if (!elf_x86_64_convert_load_reloc (abfd, contents, &r_type, 1959 irel, h, &converted_reloc, 1960 info)) 1961 goto error_return; 1962 1963 if (converted_reloc) 1964 converted = TRUE; 1965 } 1966 1967 if (! elf_x86_64_tls_transition (info, abfd, sec, contents, 1968 symtab_hdr, sym_hashes, 1969 &r_type, GOT_UNKNOWN, 1970 rel, rel_end, h, r_symndx, FALSE)) 1971 goto error_return; 1972 1973 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */ 1974 if (h == htab->elf.hgot) 1975 htab->got_referenced = TRUE; 1976 1977 eh = (struct elf_x86_link_hash_entry *) h; 1978 switch (r_type) 1979 { 1980 case R_X86_64_TLSLD: 1981 htab->tls_ld_or_ldm_got.refcount = 1; 1982 goto create_got; 1983 1984 case R_X86_64_TPOFF32: 1985 if (!bfd_link_executable (info) && ABI_64_P (abfd)) 1986 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym, 1987 &x86_64_elf_howto_table[r_type]); 1988 if (eh != NULL) 1989 eh->zero_undefweak &= 0x2; 1990 break; 1991 1992 case R_X86_64_GOTTPOFF: 1993 if (!bfd_link_executable (info)) 1994 info->flags |= DF_STATIC_TLS; 1995 /* Fall through */ 1996 1997 case R_X86_64_GOT32: 1998 case R_X86_64_GOTPCREL: 1999 case R_X86_64_GOTPCRELX: 2000 case R_X86_64_REX_GOTPCRELX: 2001 case R_X86_64_TLSGD: 2002 case R_X86_64_GOT64: 2003 case R_X86_64_GOTPCREL64: 2004 case R_X86_64_GOTPLT64: 2005 case R_X86_64_GOTPC32_TLSDESC: 2006 case R_X86_64_TLSDESC_CALL: 2007 /* This symbol requires a global offset table entry. */ 2008 { 2009 int tls_type, old_tls_type; 2010 2011 switch (r_type) 2012 { 2013 default: tls_type = GOT_NORMAL; break; 2014 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break; 2015 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break; 2016 case R_X86_64_GOTPC32_TLSDESC: 2017 case R_X86_64_TLSDESC_CALL: 2018 tls_type = GOT_TLS_GDESC; break; 2019 } 2020 2021 if (h != NULL) 2022 { 2023 h->got.refcount = 1; 2024 old_tls_type = eh->tls_type; 2025 } 2026 else 2027 { 2028 bfd_signed_vma *local_got_refcounts; 2029 2030 /* This is a global offset table entry for a local symbol. */ 2031 local_got_refcounts = elf_local_got_refcounts (abfd); 2032 if (local_got_refcounts == NULL) 2033 { 2034 bfd_size_type size; 2035 2036 size = symtab_hdr->sh_info; 2037 size *= sizeof (bfd_signed_vma) 2038 + sizeof (bfd_vma) + sizeof (char); 2039 local_got_refcounts = ((bfd_signed_vma *) 2040 bfd_zalloc (abfd, size)); 2041 if (local_got_refcounts == NULL) 2042 goto error_return; 2043 elf_local_got_refcounts (abfd) = local_got_refcounts; 2044 elf_x86_local_tlsdesc_gotent (abfd) 2045 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); 2046 elf_x86_local_got_tls_type (abfd) 2047 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); 2048 } 2049 local_got_refcounts[r_symndx] = 1; 2050 old_tls_type 2051 = elf_x86_local_got_tls_type (abfd) [r_symndx]; 2052 } 2053 2054 /* If a TLS symbol is accessed using IE at least once, 2055 there is no point to use dynamic model for it. */ 2056 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN 2057 && (! GOT_TLS_GD_ANY_P (old_tls_type) 2058 || tls_type != GOT_TLS_IE)) 2059 { 2060 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type)) 2061 tls_type = old_tls_type; 2062 else if (GOT_TLS_GD_ANY_P (old_tls_type) 2063 && GOT_TLS_GD_ANY_P (tls_type)) 2064 tls_type |= old_tls_type; 2065 else 2066 { 2067 if (h) 2068 name = h->root.root.string; 2069 else 2070 name = bfd_elf_sym_name (abfd, symtab_hdr, 2071 isym, NULL); 2072 _bfd_error_handler 2073 /* xgettext:c-format */ 2074 (_("%pB: '%s' accessed both as normal and" 2075 " thread local symbol"), 2076 abfd, name); 2077 bfd_set_error (bfd_error_bad_value); 2078 goto error_return; 2079 } 2080 } 2081 2082 if (old_tls_type != tls_type) 2083 { 2084 if (eh != NULL) 2085 eh->tls_type = tls_type; 2086 else 2087 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type; 2088 } 2089 } 2090 /* Fall through */ 2091 2092 case R_X86_64_GOTOFF64: 2093 case R_X86_64_GOTPC32: 2094 case R_X86_64_GOTPC64: 2095 create_got: 2096 if (eh != NULL) 2097 eh->zero_undefweak &= 0x2; 2098 break; 2099 2100 case R_X86_64_PLT32: 2101 case R_X86_64_PLT32_BND: 2102 /* This symbol requires a procedure linkage table entry. We 2103 actually build the entry in adjust_dynamic_symbol, 2104 because this might be a case of linking PIC code which is 2105 never referenced by a dynamic object, in which case we 2106 don't need to generate a procedure linkage table entry 2107 after all. */ 2108 2109 /* If this is a local symbol, we resolve it directly without 2110 creating a procedure linkage table entry. */ 2111 if (h == NULL) 2112 continue; 2113 2114 eh->zero_undefweak &= 0x2; 2115 h->needs_plt = 1; 2116 h->plt.refcount = 1; 2117 break; 2118 2119 case R_X86_64_PLTOFF64: 2120 /* This tries to form the 'address' of a function relative 2121 to GOT. For global symbols we need a PLT entry. */ 2122 if (h != NULL) 2123 { 2124 h->needs_plt = 1; 2125 h->plt.refcount = 1; 2126 } 2127 goto create_got; 2128 2129 case R_X86_64_SIZE32: 2130 case R_X86_64_SIZE64: 2131 size_reloc = TRUE; 2132 goto do_size; 2133 2134 case R_X86_64_PC8: 2135 case R_X86_64_PC16: 2136 case R_X86_64_PC32: 2137 case R_X86_64_PC32_BND: 2138 do_check_pic = TRUE; 2139 goto check_pic; 2140 2141 case R_X86_64_32: 2142 if (!ABI_64_P (abfd)) 2143 goto pointer; 2144 /* Fall through. */ 2145 case R_X86_64_8: 2146 case R_X86_64_16: 2147 case R_X86_64_32S: 2148 /* Check relocation overflow as these relocs may lead to 2149 run-time relocation overflow. Don't error out for 2150 sections we don't care about, such as debug sections or 2151 when relocation overflow check is disabled. */ 2152 if (!info->no_reloc_overflow_check 2153 && !converted_reloc 2154 && (bfd_link_pic (info) 2155 || (bfd_link_executable (info) 2156 && h != NULL 2157 && !h->def_regular 2158 && h->def_dynamic 2159 && (sec->flags & SEC_READONLY) == 0))) 2160 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym, 2161 &x86_64_elf_howto_table[r_type]); 2162 /* Fall through. */ 2163 2164 case R_X86_64_PC64: 2165 case R_X86_64_64: 2166 pointer: 2167 do_check_pic = FALSE; 2168 check_pic: 2169 if (eh != NULL && (sec->flags & SEC_CODE) != 0) 2170 eh->zero_undefweak |= 0x2; 2171 /* We are called after all symbols have been resolved. Only 2172 relocation against STT_GNU_IFUNC symbol must go through 2173 PLT. */ 2174 if (h != NULL 2175 && (bfd_link_executable (info) 2176 || h->type == STT_GNU_IFUNC)) 2177 { 2178 bfd_boolean func_pointer_ref = FALSE; 2179 2180 if (r_type == R_X86_64_PC32) 2181 { 2182 /* Since something like ".long foo - ." may be used 2183 as pointer, make sure that PLT is used if foo is 2184 a function defined in a shared library. */ 2185 if ((sec->flags & SEC_CODE) == 0) 2186 { 2187 h->pointer_equality_needed = 1; 2188 if (bfd_link_pie (info) 2189 && h->type == STT_FUNC 2190 && !h->def_regular 2191 && h->def_dynamic) 2192 { 2193 h->needs_plt = 1; 2194 h->plt.refcount = 1; 2195 } 2196 } 2197 } 2198 else if (r_type != R_X86_64_PC32_BND 2199 && r_type != R_X86_64_PC64) 2200 { 2201 h->pointer_equality_needed = 1; 2202 /* At run-time, R_X86_64_64 can be resolved for both 2203 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S 2204 can only be resolved for x32. */ 2205 if ((sec->flags & SEC_READONLY) == 0 2206 && (r_type == R_X86_64_64 2207 || (!ABI_64_P (abfd) 2208 && (r_type == R_X86_64_32 2209 || r_type == R_X86_64_32S)))) 2210 func_pointer_ref = TRUE; 2211 } 2212 2213 if (!func_pointer_ref) 2214 { 2215 /* If this reloc is in a read-only section, we might 2216 need a copy reloc. We can't check reliably at this 2217 stage whether the section is read-only, as input 2218 sections have not yet been mapped to output sections. 2219 Tentatively set the flag for now, and correct in 2220 adjust_dynamic_symbol. */ 2221 h->non_got_ref = 1; 2222 2223 /* We may need a .plt entry if the symbol is a function 2224 defined in a shared lib or is a function referenced 2225 from the code or read-only section. */ 2226 if (!h->def_regular 2227 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0) 2228 h->plt.refcount = 1; 2229 } 2230 } 2231 2232 if (do_check_pic) 2233 { 2234 /* Don't complain about -fPIC if the symbol is undefined 2235 when building executable unless it is unresolved weak 2236 symbol, references a dynamic definition in PIE or 2237 -z nocopyreloc is used. */ 2238 bfd_boolean no_copyreloc_p 2239 = (info->nocopyreloc 2240 || (h != NULL 2241 && eh->def_protected 2242 && elf_has_no_copy_on_protected (h->root.u.def.section->owner))); 2243 if ((sec->flags & SEC_ALLOC) != 0 2244 && (sec->flags & SEC_READONLY) != 0 2245 && h != NULL 2246 && ((bfd_link_executable (info) 2247 && ((h->root.type == bfd_link_hash_undefweak 2248 && (eh == NULL 2249 || !UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, 2250 eh))) 2251 || (bfd_link_pie (info) 2252 && !SYMBOL_DEFINED_NON_SHARED_P (h) 2253 && h->def_dynamic) 2254 || (no_copyreloc_p 2255 && h->def_dynamic 2256 && !(h->root.u.def.section->flags & SEC_CODE)))) 2257 || bfd_link_dll (info))) 2258 { 2259 bfd_boolean fail = FALSE; 2260 if (SYMBOL_REFERENCES_LOCAL_P (info, h)) 2261 { 2262 /* Symbol is referenced locally. Make sure it is 2263 defined locally. */ 2264 fail = !SYMBOL_DEFINED_NON_SHARED_P (h); 2265 } 2266 else if (bfd_link_pie (info)) 2267 { 2268 /* We can only use PC-relative relocations in PIE 2269 from non-code sections. */ 2270 if (h->type == STT_FUNC 2271 && (sec->flags & SEC_CODE) != 0) 2272 fail = TRUE; 2273 } 2274 else if (no_copyreloc_p || bfd_link_dll (info)) 2275 { 2276 /* Symbol doesn't need copy reloc and isn't 2277 referenced locally. Don't allow PC-relative 2278 relocations against default and protected 2279 symbols since address of protected function 2280 and location of protected data may not be in 2281 the shared object. */ 2282 fail = (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2283 || ELF_ST_VISIBILITY (h->other) == STV_PROTECTED); 2284 } 2285 2286 if (fail) 2287 return elf_x86_64_need_pic (info, abfd, sec, h, 2288 symtab_hdr, isym, 2289 &x86_64_elf_howto_table[r_type]); 2290 } 2291 } 2292 2293 size_reloc = FALSE; 2294 do_size: 2295 if (NEED_DYNAMIC_RELOCATION_P (info, TRUE, h, sec, r_type, 2296 htab->pointer_r_type)) 2297 { 2298 struct elf_dyn_relocs *p; 2299 struct elf_dyn_relocs **head; 2300 2301 /* We must copy these reloc types into the output file. 2302 Create a reloc section in dynobj and make room for 2303 this reloc. */ 2304 if (sreloc == NULL) 2305 { 2306 sreloc = _bfd_elf_make_dynamic_reloc_section 2307 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2, 2308 abfd, /*rela?*/ TRUE); 2309 2310 if (sreloc == NULL) 2311 goto error_return; 2312 } 2313 2314 /* If this is a global symbol, we count the number of 2315 relocations we need for this symbol. */ 2316 if (h != NULL) 2317 head = &eh->dyn_relocs; 2318 else 2319 { 2320 /* Track dynamic relocs needed for local syms too. 2321 We really need local syms available to do this 2322 easily. Oh well. */ 2323 asection *s; 2324 void **vpp; 2325 2326 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 2327 abfd, r_symndx); 2328 if (isym == NULL) 2329 goto error_return; 2330 2331 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 2332 if (s == NULL) 2333 s = sec; 2334 2335 /* Beware of type punned pointers vs strict aliasing 2336 rules. */ 2337 vpp = &(elf_section_data (s)->local_dynrel); 2338 head = (struct elf_dyn_relocs **)vpp; 2339 } 2340 2341 p = *head; 2342 if (p == NULL || p->sec != sec) 2343 { 2344 bfd_size_type amt = sizeof *p; 2345 2346 p = ((struct elf_dyn_relocs *) 2347 bfd_alloc (htab->elf.dynobj, amt)); 2348 if (p == NULL) 2349 goto error_return; 2350 p->next = *head; 2351 *head = p; 2352 p->sec = sec; 2353 p->count = 0; 2354 p->pc_count = 0; 2355 } 2356 2357 p->count += 1; 2358 /* Count size relocation as PC-relative relocation. */ 2359 if (X86_PCREL_TYPE_P (r_type) || size_reloc) 2360 p->pc_count += 1; 2361 } 2362 break; 2363 2364 /* This relocation describes the C++ object vtable hierarchy. 2365 Reconstruct it for later use during GC. */ 2366 case R_X86_64_GNU_VTINHERIT: 2367 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2368 goto error_return; 2369 break; 2370 2371 /* This relocation describes which C++ vtable entries are actually 2372 used. Record for later use during GC. */ 2373 case R_X86_64_GNU_VTENTRY: 2374 BFD_ASSERT (h != NULL); 2375 if (h != NULL 2376 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 2377 goto error_return; 2378 break; 2379 2380 default: 2381 break; 2382 } 2383 } 2384 2385 if (elf_section_data (sec)->this_hdr.contents != contents) 2386 { 2387 if (!converted && !info->keep_memory) 2388 free (contents); 2389 else 2390 { 2391 /* Cache the section contents for elf_link_input_bfd if any 2392 load is converted or --no-keep-memory isn't used. */ 2393 elf_section_data (sec)->this_hdr.contents = contents; 2394 } 2395 } 2396 2397 /* Cache relocations if any load is converted. */ 2398 if (elf_section_data (sec)->relocs != relocs && converted) 2399 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs; 2400 2401 return TRUE; 2402 2403 error_return: 2404 if (elf_section_data (sec)->this_hdr.contents != contents) 2405 free (contents); 2406 sec->check_relocs_failed = 1; 2407 return FALSE; 2408 } 2409 2410 /* Return the relocation value for @tpoff relocation 2411 if STT_TLS virtual address is ADDRESS. */ 2412 2413 static bfd_vma 2414 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address) 2415 { 2416 struct elf_link_hash_table *htab = elf_hash_table (info); 2417 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); 2418 bfd_vma static_tls_size; 2419 2420 /* If tls_segment is NULL, we should have signalled an error already. */ 2421 if (htab->tls_sec == NULL) 2422 return 0; 2423 2424 /* Consider special static TLS alignment requirements. */ 2425 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); 2426 return address - static_tls_size - htab->tls_sec->vma; 2427 } 2428 2429 /* Relocate an x86_64 ELF section. */ 2430 2431 static bfd_boolean 2432 elf_x86_64_relocate_section (bfd *output_bfd, 2433 struct bfd_link_info *info, 2434 bfd *input_bfd, 2435 asection *input_section, 2436 bfd_byte *contents, 2437 Elf_Internal_Rela *relocs, 2438 Elf_Internal_Sym *local_syms, 2439 asection **local_sections) 2440 { 2441 struct elf_x86_link_hash_table *htab; 2442 Elf_Internal_Shdr *symtab_hdr; 2443 struct elf_link_hash_entry **sym_hashes; 2444 bfd_vma *local_got_offsets; 2445 bfd_vma *local_tlsdesc_gotents; 2446 Elf_Internal_Rela *rel; 2447 Elf_Internal_Rela *wrel; 2448 Elf_Internal_Rela *relend; 2449 unsigned int plt_entry_size; 2450 2451 /* Skip if check_relocs failed. */ 2452 if (input_section->check_relocs_failed) 2453 return FALSE; 2454 2455 htab = elf_x86_hash_table (info, X86_64_ELF_DATA); 2456 if (htab == NULL) 2457 return FALSE; 2458 2459 if (!is_x86_elf (input_bfd, htab)) 2460 { 2461 bfd_set_error (bfd_error_wrong_format); 2462 return FALSE; 2463 } 2464 2465 plt_entry_size = htab->plt.plt_entry_size; 2466 symtab_hdr = &elf_symtab_hdr (input_bfd); 2467 sym_hashes = elf_sym_hashes (input_bfd); 2468 local_got_offsets = elf_local_got_offsets (input_bfd); 2469 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd); 2470 2471 _bfd_x86_elf_set_tls_module_base (info); 2472 2473 rel = wrel = relocs; 2474 relend = relocs + input_section->reloc_count; 2475 for (; rel < relend; wrel++, rel++) 2476 { 2477 unsigned int r_type, r_type_tls; 2478 reloc_howto_type *howto; 2479 unsigned long r_symndx; 2480 struct elf_link_hash_entry *h; 2481 struct elf_x86_link_hash_entry *eh; 2482 Elf_Internal_Sym *sym; 2483 asection *sec; 2484 bfd_vma off, offplt, plt_offset; 2485 bfd_vma relocation; 2486 bfd_boolean unresolved_reloc; 2487 bfd_reloc_status_type r; 2488 int tls_type; 2489 asection *base_got, *resolved_plt; 2490 bfd_vma st_size; 2491 bfd_boolean resolved_to_zero; 2492 bfd_boolean relative_reloc; 2493 bfd_boolean converted_reloc; 2494 bfd_boolean need_copy_reloc_in_pie; 2495 2496 r_type = ELF32_R_TYPE (rel->r_info); 2497 if (r_type == (int) R_X86_64_GNU_VTINHERIT 2498 || r_type == (int) R_X86_64_GNU_VTENTRY) 2499 { 2500 if (wrel != rel) 2501 *wrel = *rel; 2502 continue; 2503 } 2504 2505 r_symndx = htab->r_sym (rel->r_info); 2506 converted_reloc = (r_type & R_X86_64_converted_reloc_bit) != 0; 2507 if (converted_reloc) 2508 { 2509 r_type &= ~R_X86_64_converted_reloc_bit; 2510 rel->r_info = htab->r_info (r_symndx, r_type); 2511 } 2512 2513 howto = elf_x86_64_rtype_to_howto (input_bfd, r_type); 2514 if (howto == NULL) 2515 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type); 2516 2517 h = NULL; 2518 sym = NULL; 2519 sec = NULL; 2520 unresolved_reloc = FALSE; 2521 if (r_symndx < symtab_hdr->sh_info) 2522 { 2523 sym = local_syms + r_symndx; 2524 sec = local_sections[r_symndx]; 2525 2526 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, 2527 &sec, rel); 2528 st_size = sym->st_size; 2529 2530 /* Relocate against local STT_GNU_IFUNC symbol. */ 2531 if (!bfd_link_relocatable (info) 2532 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 2533 { 2534 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, 2535 rel, FALSE); 2536 if (h == NULL) 2537 abort (); 2538 2539 /* Set STT_GNU_IFUNC symbol value. */ 2540 h->root.u.def.value = sym->st_value; 2541 h->root.u.def.section = sec; 2542 } 2543 } 2544 else 2545 { 2546 bfd_boolean warned ATTRIBUTE_UNUSED; 2547 bfd_boolean ignored ATTRIBUTE_UNUSED; 2548 2549 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2550 r_symndx, symtab_hdr, sym_hashes, 2551 h, sec, relocation, 2552 unresolved_reloc, warned, ignored); 2553 st_size = h->size; 2554 } 2555 2556 if (sec != NULL && discarded_section (sec)) 2557 { 2558 _bfd_clear_contents (howto, input_bfd, input_section, 2559 contents, rel->r_offset); 2560 wrel->r_offset = rel->r_offset; 2561 wrel->r_info = 0; 2562 wrel->r_addend = 0; 2563 2564 /* For ld -r, remove relocations in debug sections against 2565 sections defined in discarded sections. Not done for 2566 eh_frame editing code expects to be present. */ 2567 if (bfd_link_relocatable (info) 2568 && (input_section->flags & SEC_DEBUGGING)) 2569 wrel--; 2570 2571 continue; 2572 } 2573 2574 if (bfd_link_relocatable (info)) 2575 { 2576 if (wrel != rel) 2577 *wrel = *rel; 2578 continue; 2579 } 2580 2581 if (rel->r_addend == 0 && !ABI_64_P (output_bfd)) 2582 { 2583 if (r_type == R_X86_64_64) 2584 { 2585 /* For x32, treat R_X86_64_64 like R_X86_64_32 and 2586 zero-extend it to 64bit if addend is zero. */ 2587 r_type = R_X86_64_32; 2588 memset (contents + rel->r_offset + 4, 0, 4); 2589 } 2590 else if (r_type == R_X86_64_SIZE64) 2591 { 2592 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and 2593 zero-extend it to 64bit if addend is zero. */ 2594 r_type = R_X86_64_SIZE32; 2595 memset (contents + rel->r_offset + 4, 0, 4); 2596 } 2597 } 2598 2599 eh = (struct elf_x86_link_hash_entry *) h; 2600 2601 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle 2602 it here if it is defined in a non-shared object. */ 2603 if (h != NULL 2604 && h->type == STT_GNU_IFUNC 2605 && h->def_regular) 2606 { 2607 bfd_vma plt_index; 2608 const char *name; 2609 2610 if ((input_section->flags & SEC_ALLOC) == 0) 2611 { 2612 /* If this is a SHT_NOTE section without SHF_ALLOC, treat 2613 STT_GNU_IFUNC symbol as STT_FUNC. */ 2614 if (elf_section_type (input_section) == SHT_NOTE) 2615 goto skip_ifunc; 2616 /* Dynamic relocs are not propagated for SEC_DEBUGGING 2617 sections because such sections are not SEC_ALLOC and 2618 thus ld.so will not process them. */ 2619 if ((input_section->flags & SEC_DEBUGGING) != 0) 2620 continue; 2621 abort (); 2622 } 2623 2624 switch (r_type) 2625 { 2626 default: 2627 break; 2628 2629 case R_X86_64_GOTPCREL: 2630 case R_X86_64_GOTPCRELX: 2631 case R_X86_64_REX_GOTPCRELX: 2632 case R_X86_64_GOTPCREL64: 2633 base_got = htab->elf.sgot; 2634 off = h->got.offset; 2635 2636 if (base_got == NULL) 2637 abort (); 2638 2639 if (off == (bfd_vma) -1) 2640 { 2641 /* We can't use h->got.offset here to save state, or 2642 even just remember the offset, as finish_dynamic_symbol 2643 would use that as offset into .got. */ 2644 2645 if (h->plt.offset == (bfd_vma) -1) 2646 abort (); 2647 2648 if (htab->elf.splt != NULL) 2649 { 2650 plt_index = (h->plt.offset / plt_entry_size 2651 - htab->plt.has_plt0); 2652 off = (plt_index + 3) * GOT_ENTRY_SIZE; 2653 base_got = htab->elf.sgotplt; 2654 } 2655 else 2656 { 2657 plt_index = h->plt.offset / plt_entry_size; 2658 off = plt_index * GOT_ENTRY_SIZE; 2659 base_got = htab->elf.igotplt; 2660 } 2661 2662 if (h->dynindx == -1 2663 || h->forced_local 2664 || info->symbolic) 2665 { 2666 /* This references the local defitionion. We must 2667 initialize this entry in the global offset table. 2668 Since the offset must always be a multiple of 8, 2669 we use the least significant bit to record 2670 whether we have initialized it already. 2671 2672 When doing a dynamic link, we create a .rela.got 2673 relocation entry to initialize the value. This 2674 is done in the finish_dynamic_symbol routine. */ 2675 if ((off & 1) != 0) 2676 off &= ~1; 2677 else 2678 { 2679 bfd_put_64 (output_bfd, relocation, 2680 base_got->contents + off); 2681 /* Note that this is harmless for the GOTPLT64 2682 case, as -1 | 1 still is -1. */ 2683 h->got.offset |= 1; 2684 } 2685 } 2686 } 2687 2688 relocation = (base_got->output_section->vma 2689 + base_got->output_offset + off); 2690 2691 goto do_relocation; 2692 } 2693 2694 if (h->plt.offset == (bfd_vma) -1) 2695 { 2696 /* Handle static pointers of STT_GNU_IFUNC symbols. */ 2697 if (r_type == htab->pointer_r_type 2698 && (input_section->flags & SEC_CODE) == 0) 2699 goto do_ifunc_pointer; 2700 goto bad_ifunc_reloc; 2701 } 2702 2703 /* STT_GNU_IFUNC symbol must go through PLT. */ 2704 if (htab->elf.splt != NULL) 2705 { 2706 if (htab->plt_second != NULL) 2707 { 2708 resolved_plt = htab->plt_second; 2709 plt_offset = eh->plt_second.offset; 2710 } 2711 else 2712 { 2713 resolved_plt = htab->elf.splt; 2714 plt_offset = h->plt.offset; 2715 } 2716 } 2717 else 2718 { 2719 resolved_plt = htab->elf.iplt; 2720 plt_offset = h->plt.offset; 2721 } 2722 2723 relocation = (resolved_plt->output_section->vma 2724 + resolved_plt->output_offset + plt_offset); 2725 2726 switch (r_type) 2727 { 2728 default: 2729 bad_ifunc_reloc: 2730 if (h->root.root.string) 2731 name = h->root.root.string; 2732 else 2733 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, 2734 NULL); 2735 _bfd_error_handler 2736 /* xgettext:c-format */ 2737 (_("%pB: relocation %s against STT_GNU_IFUNC " 2738 "symbol `%s' isn't supported"), input_bfd, 2739 howto->name, name); 2740 bfd_set_error (bfd_error_bad_value); 2741 return FALSE; 2742 2743 case R_X86_64_32S: 2744 if (bfd_link_pic (info)) 2745 abort (); 2746 goto do_relocation; 2747 2748 case R_X86_64_32: 2749 if (ABI_64_P (output_bfd)) 2750 goto do_relocation; 2751 /* FALLTHROUGH */ 2752 case R_X86_64_64: 2753 do_ifunc_pointer: 2754 if (rel->r_addend != 0) 2755 { 2756 if (h->root.root.string) 2757 name = h->root.root.string; 2758 else 2759 name = bfd_elf_sym_name (input_bfd, symtab_hdr, 2760 sym, NULL); 2761 _bfd_error_handler 2762 /* xgettext:c-format */ 2763 (_("%pB: relocation %s against STT_GNU_IFUNC " 2764 "symbol `%s' has non-zero addend: %" PRId64), 2765 input_bfd, howto->name, name, (int64_t) rel->r_addend); 2766 bfd_set_error (bfd_error_bad_value); 2767 return FALSE; 2768 } 2769 2770 /* Generate dynamic relcoation only when there is a 2771 non-GOT reference in a shared object or there is no 2772 PLT. */ 2773 if ((bfd_link_pic (info) && h->non_got_ref) 2774 || h->plt.offset == (bfd_vma) -1) 2775 { 2776 Elf_Internal_Rela outrel; 2777 asection *sreloc; 2778 2779 /* Need a dynamic relocation to get the real function 2780 address. */ 2781 outrel.r_offset = _bfd_elf_section_offset (output_bfd, 2782 info, 2783 input_section, 2784 rel->r_offset); 2785 if (outrel.r_offset == (bfd_vma) -1 2786 || outrel.r_offset == (bfd_vma) -2) 2787 abort (); 2788 2789 outrel.r_offset += (input_section->output_section->vma 2790 + input_section->output_offset); 2791 2792 if (POINTER_LOCAL_IFUNC_P (info, h)) 2793 { 2794 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 2795 h->root.root.string, 2796 h->root.u.def.section->owner); 2797 2798 /* This symbol is resolved locally. */ 2799 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE); 2800 outrel.r_addend = (h->root.u.def.value 2801 + h->root.u.def.section->output_section->vma 2802 + h->root.u.def.section->output_offset); 2803 } 2804 else 2805 { 2806 outrel.r_info = htab->r_info (h->dynindx, r_type); 2807 outrel.r_addend = 0; 2808 } 2809 2810 /* Dynamic relocations are stored in 2811 1. .rela.ifunc section in PIC object. 2812 2. .rela.got section in dynamic executable. 2813 3. .rela.iplt section in static executable. */ 2814 if (bfd_link_pic (info)) 2815 sreloc = htab->elf.irelifunc; 2816 else if (htab->elf.splt != NULL) 2817 sreloc = htab->elf.srelgot; 2818 else 2819 sreloc = htab->elf.irelplt; 2820 elf_append_rela (output_bfd, sreloc, &outrel); 2821 2822 /* If this reloc is against an external symbol, we 2823 do not want to fiddle with the addend. Otherwise, 2824 we need to include the symbol value so that it 2825 becomes an addend for the dynamic reloc. For an 2826 internal symbol, we have updated addend. */ 2827 continue; 2828 } 2829 /* FALLTHROUGH */ 2830 case R_X86_64_PC32: 2831 case R_X86_64_PC32_BND: 2832 case R_X86_64_PC64: 2833 case R_X86_64_PLT32: 2834 case R_X86_64_PLT32_BND: 2835 goto do_relocation; 2836 } 2837 } 2838 2839 skip_ifunc: 2840 resolved_to_zero = (eh != NULL 2841 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh)); 2842 2843 /* When generating a shared object, the relocations handled here are 2844 copied into the output file to be resolved at run time. */ 2845 switch (r_type) 2846 { 2847 case R_X86_64_GOT32: 2848 case R_X86_64_GOT64: 2849 /* Relocation is to the entry for this symbol in the global 2850 offset table. */ 2851 case R_X86_64_GOTPCREL: 2852 case R_X86_64_GOTPCRELX: 2853 case R_X86_64_REX_GOTPCRELX: 2854 case R_X86_64_GOTPCREL64: 2855 /* Use global offset table entry as symbol value. */ 2856 case R_X86_64_GOTPLT64: 2857 /* This is obsolete and treated the same as GOT64. */ 2858 base_got = htab->elf.sgot; 2859 2860 if (htab->elf.sgot == NULL) 2861 abort (); 2862 2863 relative_reloc = FALSE; 2864 if (h != NULL) 2865 { 2866 off = h->got.offset; 2867 if (h->needs_plt 2868 && h->plt.offset != (bfd_vma)-1 2869 && off == (bfd_vma)-1) 2870 { 2871 /* We can't use h->got.offset here to save 2872 state, or even just remember the offset, as 2873 finish_dynamic_symbol would use that as offset into 2874 .got. */ 2875 bfd_vma plt_index = (h->plt.offset / plt_entry_size 2876 - htab->plt.has_plt0); 2877 off = (plt_index + 3) * GOT_ENTRY_SIZE; 2878 base_got = htab->elf.sgotplt; 2879 } 2880 2881 if (RESOLVED_LOCALLY_P (info, h, htab)) 2882 { 2883 /* We must initialize this entry in the global offset 2884 table. Since the offset must always be a multiple 2885 of 8, we use the least significant bit to record 2886 whether we have initialized it already. 2887 2888 When doing a dynamic link, we create a .rela.got 2889 relocation entry to initialize the value. This is 2890 done in the finish_dynamic_symbol routine. */ 2891 if ((off & 1) != 0) 2892 off &= ~1; 2893 else 2894 { 2895 bfd_put_64 (output_bfd, relocation, 2896 base_got->contents + off); 2897 /* Note that this is harmless for the GOTPLT64 case, 2898 as -1 | 1 still is -1. */ 2899 h->got.offset |= 1; 2900 2901 if (GENERATE_RELATIVE_RELOC_P (info, h)) 2902 { 2903 /* If this symbol isn't dynamic in PIC, 2904 generate R_X86_64_RELATIVE here. */ 2905 eh->no_finish_dynamic_symbol = 1; 2906 relative_reloc = TRUE; 2907 } 2908 } 2909 } 2910 else 2911 unresolved_reloc = FALSE; 2912 } 2913 else 2914 { 2915 if (local_got_offsets == NULL) 2916 abort (); 2917 2918 off = local_got_offsets[r_symndx]; 2919 2920 /* The offset must always be a multiple of 8. We use 2921 the least significant bit to record whether we have 2922 already generated the necessary reloc. */ 2923 if ((off & 1) != 0) 2924 off &= ~1; 2925 else 2926 { 2927 bfd_put_64 (output_bfd, relocation, 2928 base_got->contents + off); 2929 local_got_offsets[r_symndx] |= 1; 2930 2931 if (bfd_link_pic (info)) 2932 relative_reloc = TRUE; 2933 } 2934 } 2935 2936 if (relative_reloc) 2937 { 2938 asection *s; 2939 Elf_Internal_Rela outrel; 2940 2941 /* We need to generate a R_X86_64_RELATIVE reloc 2942 for the dynamic linker. */ 2943 s = htab->elf.srelgot; 2944 if (s == NULL) 2945 abort (); 2946 2947 outrel.r_offset = (base_got->output_section->vma 2948 + base_got->output_offset 2949 + off); 2950 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE); 2951 outrel.r_addend = relocation; 2952 elf_append_rela (output_bfd, s, &outrel); 2953 } 2954 2955 if (off >= (bfd_vma) -2) 2956 abort (); 2957 2958 relocation = base_got->output_section->vma 2959 + base_got->output_offset + off; 2960 if (r_type != R_X86_64_GOTPCREL 2961 && r_type != R_X86_64_GOTPCRELX 2962 && r_type != R_X86_64_REX_GOTPCRELX 2963 && r_type != R_X86_64_GOTPCREL64) 2964 relocation -= htab->elf.sgotplt->output_section->vma 2965 - htab->elf.sgotplt->output_offset; 2966 2967 break; 2968 2969 case R_X86_64_GOTOFF64: 2970 /* Relocation is relative to the start of the global offset 2971 table. */ 2972 2973 /* Check to make sure it isn't a protected function or data 2974 symbol for shared library since it may not be local when 2975 used as function address or with copy relocation. We also 2976 need to make sure that a symbol is referenced locally. */ 2977 if (bfd_link_pic (info) && h) 2978 { 2979 if (!h->def_regular) 2980 { 2981 const char *v; 2982 2983 switch (ELF_ST_VISIBILITY (h->other)) 2984 { 2985 case STV_HIDDEN: 2986 v = _("hidden symbol"); 2987 break; 2988 case STV_INTERNAL: 2989 v = _("internal symbol"); 2990 break; 2991 case STV_PROTECTED: 2992 v = _("protected symbol"); 2993 break; 2994 default: 2995 v = _("symbol"); 2996 break; 2997 } 2998 2999 _bfd_error_handler 3000 /* xgettext:c-format */ 3001 (_("%pB: relocation R_X86_64_GOTOFF64 against undefined %s" 3002 " `%s' can not be used when making a shared object"), 3003 input_bfd, v, h->root.root.string); 3004 bfd_set_error (bfd_error_bad_value); 3005 return FALSE; 3006 } 3007 else if (!bfd_link_executable (info) 3008 && !SYMBOL_REFERENCES_LOCAL_P (info, h) 3009 && (h->type == STT_FUNC 3010 || h->type == STT_OBJECT) 3011 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) 3012 { 3013 _bfd_error_handler 3014 /* xgettext:c-format */ 3015 (_("%pB: relocation R_X86_64_GOTOFF64 against protected %s" 3016 " `%s' can not be used when making a shared object"), 3017 input_bfd, 3018 h->type == STT_FUNC ? "function" : "data", 3019 h->root.root.string); 3020 bfd_set_error (bfd_error_bad_value); 3021 return FALSE; 3022 } 3023 } 3024 3025 /* Note that sgot is not involved in this 3026 calculation. We always want the start of .got.plt. If we 3027 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is 3028 permitted by the ABI, we might have to change this 3029 calculation. */ 3030 relocation -= htab->elf.sgotplt->output_section->vma 3031 + htab->elf.sgotplt->output_offset; 3032 break; 3033 3034 case R_X86_64_GOTPC32: 3035 case R_X86_64_GOTPC64: 3036 /* Use global offset table as symbol value. */ 3037 relocation = htab->elf.sgotplt->output_section->vma 3038 + htab->elf.sgotplt->output_offset; 3039 unresolved_reloc = FALSE; 3040 break; 3041 3042 case R_X86_64_PLTOFF64: 3043 /* Relocation is PLT entry relative to GOT. For local 3044 symbols it's the symbol itself relative to GOT. */ 3045 if (h != NULL 3046 /* See PLT32 handling. */ 3047 && (h->plt.offset != (bfd_vma) -1 3048 || eh->plt_got.offset != (bfd_vma) -1) 3049 && htab->elf.splt != NULL) 3050 { 3051 if (eh->plt_got.offset != (bfd_vma) -1) 3052 { 3053 /* Use the GOT PLT. */ 3054 resolved_plt = htab->plt_got; 3055 plt_offset = eh->plt_got.offset; 3056 } 3057 else if (htab->plt_second != NULL) 3058 { 3059 resolved_plt = htab->plt_second; 3060 plt_offset = eh->plt_second.offset; 3061 } 3062 else 3063 { 3064 resolved_plt = htab->elf.splt; 3065 plt_offset = h->plt.offset; 3066 } 3067 3068 relocation = (resolved_plt->output_section->vma 3069 + resolved_plt->output_offset 3070 + plt_offset); 3071 unresolved_reloc = FALSE; 3072 } 3073 3074 relocation -= htab->elf.sgotplt->output_section->vma 3075 + htab->elf.sgotplt->output_offset; 3076 break; 3077 3078 case R_X86_64_PLT32: 3079 case R_X86_64_PLT32_BND: 3080 /* Relocation is to the entry for this symbol in the 3081 procedure linkage table. */ 3082 3083 /* Resolve a PLT32 reloc against a local symbol directly, 3084 without using the procedure linkage table. */ 3085 if (h == NULL) 3086 break; 3087 3088 if ((h->plt.offset == (bfd_vma) -1 3089 && eh->plt_got.offset == (bfd_vma) -1) 3090 || htab->elf.splt == NULL) 3091 { 3092 /* We didn't make a PLT entry for this symbol. This 3093 happens when statically linking PIC code, or when 3094 using -Bsymbolic. */ 3095 break; 3096 } 3097 3098 use_plt: 3099 if (h->plt.offset != (bfd_vma) -1) 3100 { 3101 if (htab->plt_second != NULL) 3102 { 3103 resolved_plt = htab->plt_second; 3104 plt_offset = eh->plt_second.offset; 3105 } 3106 else 3107 { 3108 resolved_plt = htab->elf.splt; 3109 plt_offset = h->plt.offset; 3110 } 3111 } 3112 else 3113 { 3114 /* Use the GOT PLT. */ 3115 resolved_plt = htab->plt_got; 3116 plt_offset = eh->plt_got.offset; 3117 } 3118 3119 relocation = (resolved_plt->output_section->vma 3120 + resolved_plt->output_offset 3121 + plt_offset); 3122 unresolved_reloc = FALSE; 3123 break; 3124 3125 case R_X86_64_SIZE32: 3126 case R_X86_64_SIZE64: 3127 /* Set to symbol size. */ 3128 relocation = st_size; 3129 goto direct; 3130 3131 case R_X86_64_PC8: 3132 case R_X86_64_PC16: 3133 case R_X86_64_PC32: 3134 case R_X86_64_PC32_BND: 3135 /* Since x86-64 has PC-relative PLT, we can use PLT in PIE 3136 as function address. */ 3137 if (h != NULL 3138 && (input_section->flags & SEC_CODE) == 0 3139 && bfd_link_pie (info) 3140 && h->type == STT_FUNC 3141 && !h->def_regular 3142 && h->def_dynamic) 3143 goto use_plt; 3144 /* Fall through. */ 3145 3146 case R_X86_64_8: 3147 case R_X86_64_16: 3148 case R_X86_64_32: 3149 case R_X86_64_PC64: 3150 case R_X86_64_64: 3151 /* FIXME: The ABI says the linker should make sure the value is 3152 the same when it's zeroextended to 64 bit. */ 3153 3154 direct: 3155 if ((input_section->flags & SEC_ALLOC) == 0) 3156 break; 3157 3158 need_copy_reloc_in_pie = (bfd_link_pie (info) 3159 && h != NULL 3160 && (h->needs_copy 3161 || eh->needs_copy 3162 || (h->root.type 3163 == bfd_link_hash_undefined)) 3164 && (X86_PCREL_TYPE_P (r_type) 3165 || X86_SIZE_TYPE_P (r_type))); 3166 3167 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type, 3168 need_copy_reloc_in_pie, 3169 resolved_to_zero, FALSE)) 3170 { 3171 Elf_Internal_Rela outrel; 3172 bfd_boolean skip, relocate; 3173 asection *sreloc; 3174 3175 /* When generating a shared object, these relocations 3176 are copied into the output file to be resolved at run 3177 time. */ 3178 skip = FALSE; 3179 relocate = FALSE; 3180 3181 outrel.r_offset = 3182 _bfd_elf_section_offset (output_bfd, info, input_section, 3183 rel->r_offset); 3184 if (outrel.r_offset == (bfd_vma) -1) 3185 skip = TRUE; 3186 else if (outrel.r_offset == (bfd_vma) -2) 3187 skip = TRUE, relocate = TRUE; 3188 3189 outrel.r_offset += (input_section->output_section->vma 3190 + input_section->output_offset); 3191 3192 if (skip) 3193 memset (&outrel, 0, sizeof outrel); 3194 3195 else if (COPY_INPUT_RELOC_P (info, h, r_type)) 3196 { 3197 outrel.r_info = htab->r_info (h->dynindx, r_type); 3198 outrel.r_addend = rel->r_addend; 3199 } 3200 else 3201 { 3202 /* This symbol is local, or marked to become local. 3203 When relocation overflow check is disabled, we 3204 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */ 3205 if (r_type == htab->pointer_r_type 3206 || (r_type == R_X86_64_32 3207 && info->no_reloc_overflow_check)) 3208 { 3209 relocate = TRUE; 3210 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE); 3211 outrel.r_addend = relocation + rel->r_addend; 3212 } 3213 else if (r_type == R_X86_64_64 3214 && !ABI_64_P (output_bfd)) 3215 { 3216 relocate = TRUE; 3217 outrel.r_info = htab->r_info (0, 3218 R_X86_64_RELATIVE64); 3219 outrel.r_addend = relocation + rel->r_addend; 3220 /* Check addend overflow. */ 3221 if ((outrel.r_addend & 0x80000000) 3222 != (rel->r_addend & 0x80000000)) 3223 { 3224 const char *name; 3225 int addend = rel->r_addend; 3226 if (h && h->root.root.string) 3227 name = h->root.root.string; 3228 else 3229 name = bfd_elf_sym_name (input_bfd, symtab_hdr, 3230 sym, NULL); 3231 _bfd_error_handler 3232 /* xgettext:c-format */ 3233 (_("%pB: addend %s%#x in relocation %s against " 3234 "symbol `%s' at %#" PRIx64 3235 " in section `%pA' is out of range"), 3236 input_bfd, addend < 0 ? "-" : "", addend, 3237 howto->name, name, (uint64_t) rel->r_offset, 3238 input_section); 3239 bfd_set_error (bfd_error_bad_value); 3240 return FALSE; 3241 } 3242 } 3243 else 3244 { 3245 long sindx; 3246 3247 if (bfd_is_abs_section (sec)) 3248 sindx = 0; 3249 else if (sec == NULL || sec->owner == NULL) 3250 { 3251 bfd_set_error (bfd_error_bad_value); 3252 return FALSE; 3253 } 3254 else 3255 { 3256 asection *osec; 3257 3258 /* We are turning this relocation into one 3259 against a section symbol. It would be 3260 proper to subtract the symbol's value, 3261 osec->vma, from the emitted reloc addend, 3262 but ld.so expects buggy relocs. */ 3263 osec = sec->output_section; 3264 sindx = elf_section_data (osec)->dynindx; 3265 if (sindx == 0) 3266 { 3267 asection *oi = htab->elf.text_index_section; 3268 sindx = elf_section_data (oi)->dynindx; 3269 } 3270 BFD_ASSERT (sindx != 0); 3271 } 3272 3273 outrel.r_info = htab->r_info (sindx, r_type); 3274 outrel.r_addend = relocation + rel->r_addend; 3275 } 3276 } 3277 3278 sreloc = elf_section_data (input_section)->sreloc; 3279 3280 if (sreloc == NULL || sreloc->contents == NULL) 3281 { 3282 r = bfd_reloc_notsupported; 3283 goto check_relocation_error; 3284 } 3285 3286 elf_append_rela (output_bfd, sreloc, &outrel); 3287 3288 /* If this reloc is against an external symbol, we do 3289 not want to fiddle with the addend. Otherwise, we 3290 need to include the symbol value so that it becomes 3291 an addend for the dynamic reloc. */ 3292 if (! relocate) 3293 continue; 3294 } 3295 3296 break; 3297 3298 case R_X86_64_TLSGD: 3299 case R_X86_64_GOTPC32_TLSDESC: 3300 case R_X86_64_TLSDESC_CALL: 3301 case R_X86_64_GOTTPOFF: 3302 tls_type = GOT_UNKNOWN; 3303 if (h == NULL && local_got_offsets) 3304 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx]; 3305 else if (h != NULL) 3306 tls_type = elf_x86_hash_entry (h)->tls_type; 3307 3308 r_type_tls = r_type; 3309 if (! elf_x86_64_tls_transition (info, input_bfd, 3310 input_section, contents, 3311 symtab_hdr, sym_hashes, 3312 &r_type_tls, tls_type, rel, 3313 relend, h, r_symndx, TRUE)) 3314 return FALSE; 3315 3316 if (r_type_tls == R_X86_64_TPOFF32) 3317 { 3318 bfd_vma roff = rel->r_offset; 3319 3320 BFD_ASSERT (! unresolved_reloc); 3321 3322 if (r_type == R_X86_64_TLSGD) 3323 { 3324 /* GD->LE transition. For 64bit, change 3325 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 3326 .word 0x6666; rex64; call __tls_get_addr@PLT 3327 or 3328 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 3329 .byte 0x66; rex64 3330 call *__tls_get_addr@GOTPCREL(%rip) 3331 which may be converted to 3332 addr32 call __tls_get_addr 3333 into: 3334 movq %fs:0, %rax 3335 leaq foo@tpoff(%rax), %rax 3336 For 32bit, change 3337 leaq foo@tlsgd(%rip), %rdi 3338 .word 0x6666; rex64; call __tls_get_addr@PLT 3339 or 3340 leaq foo@tlsgd(%rip), %rdi 3341 .byte 0x66; rex64 3342 call *__tls_get_addr@GOTPCREL(%rip) 3343 which may be converted to 3344 addr32 call __tls_get_addr 3345 into: 3346 movl %fs:0, %eax 3347 leaq foo@tpoff(%rax), %rax 3348 For largepic, change: 3349 leaq foo@tlsgd(%rip), %rdi 3350 movabsq $__tls_get_addr@pltoff, %rax 3351 addq %r15, %rax 3352 call *%rax 3353 into: 3354 movq %fs:0, %rax 3355 leaq foo@tpoff(%rax), %rax 3356 nopw 0x0(%rax,%rax,1) */ 3357 int largepic = 0; 3358 if (ABI_64_P (output_bfd)) 3359 { 3360 if (contents[roff + 5] == 0xb8) 3361 { 3362 memcpy (contents + roff - 3, 3363 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80" 3364 "\0\0\0\0\x66\x0f\x1f\x44\0", 22); 3365 largepic = 1; 3366 } 3367 else 3368 memcpy (contents + roff - 4, 3369 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", 3370 16); 3371 } 3372 else 3373 memcpy (contents + roff - 3, 3374 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", 3375 15); 3376 bfd_put_32 (output_bfd, 3377 elf_x86_64_tpoff (info, relocation), 3378 contents + roff + 8 + largepic); 3379 /* Skip R_X86_64_PC32, R_X86_64_PLT32, 3380 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */ 3381 rel++; 3382 wrel++; 3383 continue; 3384 } 3385 else if (r_type == R_X86_64_GOTPC32_TLSDESC) 3386 { 3387 /* GDesc -> LE transition. 3388 It's originally something like: 3389 leaq x@tlsdesc(%rip), %rax 3390 3391 Change it to: 3392 movl $x@tpoff, %rax. */ 3393 3394 unsigned int val, type; 3395 3396 type = bfd_get_8 (input_bfd, contents + roff - 3); 3397 val = bfd_get_8 (input_bfd, contents + roff - 1); 3398 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1), 3399 contents + roff - 3); 3400 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2); 3401 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 3402 contents + roff - 1); 3403 bfd_put_32 (output_bfd, 3404 elf_x86_64_tpoff (info, relocation), 3405 contents + roff); 3406 continue; 3407 } 3408 else if (r_type == R_X86_64_TLSDESC_CALL) 3409 { 3410 /* GDesc -> LE transition. 3411 It's originally: 3412 call *(%rax) 3413 Turn it into: 3414 xchg %ax,%ax. */ 3415 bfd_put_8 (output_bfd, 0x66, contents + roff); 3416 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 3417 continue; 3418 } 3419 else if (r_type == R_X86_64_GOTTPOFF) 3420 { 3421 /* IE->LE transition: 3422 For 64bit, originally it can be one of: 3423 movq foo@gottpoff(%rip), %reg 3424 addq foo@gottpoff(%rip), %reg 3425 We change it into: 3426 movq $foo, %reg 3427 leaq foo(%reg), %reg 3428 addq $foo, %reg. 3429 For 32bit, originally it can be one of: 3430 movq foo@gottpoff(%rip), %reg 3431 addl foo@gottpoff(%rip), %reg 3432 We change it into: 3433 movq $foo, %reg 3434 leal foo(%reg), %reg 3435 addl $foo, %reg. */ 3436 3437 unsigned int val, type, reg; 3438 3439 if (roff >= 3) 3440 val = bfd_get_8 (input_bfd, contents + roff - 3); 3441 else 3442 val = 0; 3443 type = bfd_get_8 (input_bfd, contents + roff - 2); 3444 reg = bfd_get_8 (input_bfd, contents + roff - 1); 3445 reg >>= 3; 3446 if (type == 0x8b) 3447 { 3448 /* movq */ 3449 if (val == 0x4c) 3450 bfd_put_8 (output_bfd, 0x49, 3451 contents + roff - 3); 3452 else if (!ABI_64_P (output_bfd) && val == 0x44) 3453 bfd_put_8 (output_bfd, 0x41, 3454 contents + roff - 3); 3455 bfd_put_8 (output_bfd, 0xc7, 3456 contents + roff - 2); 3457 bfd_put_8 (output_bfd, 0xc0 | reg, 3458 contents + roff - 1); 3459 } 3460 else if (reg == 4) 3461 { 3462 /* addq/addl -> addq/addl - addressing with %rsp/%r12 3463 is special */ 3464 if (val == 0x4c) 3465 bfd_put_8 (output_bfd, 0x49, 3466 contents + roff - 3); 3467 else if (!ABI_64_P (output_bfd) && val == 0x44) 3468 bfd_put_8 (output_bfd, 0x41, 3469 contents + roff - 3); 3470 bfd_put_8 (output_bfd, 0x81, 3471 contents + roff - 2); 3472 bfd_put_8 (output_bfd, 0xc0 | reg, 3473 contents + roff - 1); 3474 } 3475 else 3476 { 3477 /* addq/addl -> leaq/leal */ 3478 if (val == 0x4c) 3479 bfd_put_8 (output_bfd, 0x4d, 3480 contents + roff - 3); 3481 else if (!ABI_64_P (output_bfd) && val == 0x44) 3482 bfd_put_8 (output_bfd, 0x45, 3483 contents + roff - 3); 3484 bfd_put_8 (output_bfd, 0x8d, 3485 contents + roff - 2); 3486 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), 3487 contents + roff - 1); 3488 } 3489 bfd_put_32 (output_bfd, 3490 elf_x86_64_tpoff (info, relocation), 3491 contents + roff); 3492 continue; 3493 } 3494 else 3495 BFD_ASSERT (FALSE); 3496 } 3497 3498 if (htab->elf.sgot == NULL) 3499 abort (); 3500 3501 if (h != NULL) 3502 { 3503 off = h->got.offset; 3504 offplt = elf_x86_hash_entry (h)->tlsdesc_got; 3505 } 3506 else 3507 { 3508 if (local_got_offsets == NULL) 3509 abort (); 3510 3511 off = local_got_offsets[r_symndx]; 3512 offplt = local_tlsdesc_gotents[r_symndx]; 3513 } 3514 3515 if ((off & 1) != 0) 3516 off &= ~1; 3517 else 3518 { 3519 Elf_Internal_Rela outrel; 3520 int dr_type, indx; 3521 asection *sreloc; 3522 3523 if (htab->elf.srelgot == NULL) 3524 abort (); 3525 3526 indx = h && h->dynindx != -1 ? h->dynindx : 0; 3527 3528 if (GOT_TLS_GDESC_P (tls_type)) 3529 { 3530 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC); 3531 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt 3532 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size); 3533 outrel.r_offset = (htab->elf.sgotplt->output_section->vma 3534 + htab->elf.sgotplt->output_offset 3535 + offplt 3536 + htab->sgotplt_jump_table_size); 3537 sreloc = htab->elf.srelplt; 3538 if (indx == 0) 3539 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info); 3540 else 3541 outrel.r_addend = 0; 3542 elf_append_rela (output_bfd, sreloc, &outrel); 3543 } 3544 3545 sreloc = htab->elf.srelgot; 3546 3547 outrel.r_offset = (htab->elf.sgot->output_section->vma 3548 + htab->elf.sgot->output_offset + off); 3549 3550 if (GOT_TLS_GD_P (tls_type)) 3551 dr_type = R_X86_64_DTPMOD64; 3552 else if (GOT_TLS_GDESC_P (tls_type)) 3553 goto dr_done; 3554 else 3555 dr_type = R_X86_64_TPOFF64; 3556 3557 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off); 3558 outrel.r_addend = 0; 3559 if ((dr_type == R_X86_64_TPOFF64 3560 || dr_type == R_X86_64_TLSDESC) && indx == 0) 3561 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info); 3562 outrel.r_info = htab->r_info (indx, dr_type); 3563 3564 elf_append_rela (output_bfd, sreloc, &outrel); 3565 3566 if (GOT_TLS_GD_P (tls_type)) 3567 { 3568 if (indx == 0) 3569 { 3570 BFD_ASSERT (! unresolved_reloc); 3571 bfd_put_64 (output_bfd, 3572 relocation - _bfd_x86_elf_dtpoff_base (info), 3573 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 3574 } 3575 else 3576 { 3577 bfd_put_64 (output_bfd, 0, 3578 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 3579 outrel.r_info = htab->r_info (indx, 3580 R_X86_64_DTPOFF64); 3581 outrel.r_offset += GOT_ENTRY_SIZE; 3582 elf_append_rela (output_bfd, sreloc, 3583 &outrel); 3584 } 3585 } 3586 3587 dr_done: 3588 if (h != NULL) 3589 h->got.offset |= 1; 3590 else 3591 local_got_offsets[r_symndx] |= 1; 3592 } 3593 3594 if (off >= (bfd_vma) -2 3595 && ! GOT_TLS_GDESC_P (tls_type)) 3596 abort (); 3597 if (r_type_tls == r_type) 3598 { 3599 if (r_type == R_X86_64_GOTPC32_TLSDESC 3600 || r_type == R_X86_64_TLSDESC_CALL) 3601 relocation = htab->elf.sgotplt->output_section->vma 3602 + htab->elf.sgotplt->output_offset 3603 + offplt + htab->sgotplt_jump_table_size; 3604 else 3605 relocation = htab->elf.sgot->output_section->vma 3606 + htab->elf.sgot->output_offset + off; 3607 unresolved_reloc = FALSE; 3608 } 3609 else 3610 { 3611 bfd_vma roff = rel->r_offset; 3612 3613 if (r_type == R_X86_64_TLSGD) 3614 { 3615 /* GD->IE transition. For 64bit, change 3616 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 3617 .word 0x6666; rex64; call __tls_get_addr@PLT 3618 or 3619 .byte 0x66; leaq foo@tlsgd(%rip), %rdi 3620 .byte 0x66; rex64 3621 call *__tls_get_addr@GOTPCREL(%rip 3622 which may be converted to 3623 addr32 call __tls_get_addr 3624 into: 3625 movq %fs:0, %rax 3626 addq foo@gottpoff(%rip), %rax 3627 For 32bit, change 3628 leaq foo@tlsgd(%rip), %rdi 3629 .word 0x6666; rex64; call __tls_get_addr@PLT 3630 or 3631 leaq foo@tlsgd(%rip), %rdi 3632 .byte 0x66; rex64; 3633 call *__tls_get_addr@GOTPCREL(%rip) 3634 which may be converted to 3635 addr32 call __tls_get_addr 3636 into: 3637 movl %fs:0, %eax 3638 addq foo@gottpoff(%rip), %rax 3639 For largepic, change: 3640 leaq foo@tlsgd(%rip), %rdi 3641 movabsq $__tls_get_addr@pltoff, %rax 3642 addq %r15, %rax 3643 call *%rax 3644 into: 3645 movq %fs:0, %rax 3646 addq foo@gottpoff(%rax), %rax 3647 nopw 0x0(%rax,%rax,1) */ 3648 int largepic = 0; 3649 if (ABI_64_P (output_bfd)) 3650 { 3651 if (contents[roff + 5] == 0xb8) 3652 { 3653 memcpy (contents + roff - 3, 3654 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05" 3655 "\0\0\0\0\x66\x0f\x1f\x44\0", 22); 3656 largepic = 1; 3657 } 3658 else 3659 memcpy (contents + roff - 4, 3660 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", 3661 16); 3662 } 3663 else 3664 memcpy (contents + roff - 3, 3665 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", 3666 15); 3667 3668 relocation = (htab->elf.sgot->output_section->vma 3669 + htab->elf.sgot->output_offset + off 3670 - roff 3671 - largepic 3672 - input_section->output_section->vma 3673 - input_section->output_offset 3674 - 12); 3675 bfd_put_32 (output_bfd, relocation, 3676 contents + roff + 8 + largepic); 3677 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */ 3678 rel++; 3679 wrel++; 3680 continue; 3681 } 3682 else if (r_type == R_X86_64_GOTPC32_TLSDESC) 3683 { 3684 /* GDesc -> IE transition. 3685 It's originally something like: 3686 leaq x@tlsdesc(%rip), %rax 3687 3688 Change it to: 3689 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */ 3690 3691 /* Now modify the instruction as appropriate. To 3692 turn a leaq into a movq in the form we use it, it 3693 suffices to change the second byte from 0x8d to 3694 0x8b. */ 3695 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); 3696 3697 bfd_put_32 (output_bfd, 3698 htab->elf.sgot->output_section->vma 3699 + htab->elf.sgot->output_offset + off 3700 - rel->r_offset 3701 - input_section->output_section->vma 3702 - input_section->output_offset 3703 - 4, 3704 contents + roff); 3705 continue; 3706 } 3707 else if (r_type == R_X86_64_TLSDESC_CALL) 3708 { 3709 /* GDesc -> IE transition. 3710 It's originally: 3711 call *(%rax) 3712 3713 Change it to: 3714 xchg %ax, %ax. */ 3715 3716 bfd_put_8 (output_bfd, 0x66, contents + roff); 3717 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 3718 continue; 3719 } 3720 else 3721 BFD_ASSERT (FALSE); 3722 } 3723 break; 3724 3725 case R_X86_64_TLSLD: 3726 if (! elf_x86_64_tls_transition (info, input_bfd, 3727 input_section, contents, 3728 symtab_hdr, sym_hashes, 3729 &r_type, GOT_UNKNOWN, rel, 3730 relend, h, r_symndx, TRUE)) 3731 return FALSE; 3732 3733 if (r_type != R_X86_64_TLSLD) 3734 { 3735 /* LD->LE transition: 3736 leaq foo@tlsld(%rip), %rdi 3737 call __tls_get_addr@PLT 3738 For 64bit, we change it into: 3739 .word 0x6666; .byte 0x66; movq %fs:0, %rax 3740 For 32bit, we change it into: 3741 nopl 0x0(%rax); movl %fs:0, %eax 3742 Or 3743 leaq foo@tlsld(%rip), %rdi; 3744 call *__tls_get_addr@GOTPCREL(%rip) 3745 which may be converted to 3746 addr32 call __tls_get_addr 3747 For 64bit, we change it into: 3748 .word 0x6666; .word 0x6666; movq %fs:0, %rax 3749 For 32bit, we change it into: 3750 nopw 0x0(%rax); movl %fs:0, %eax 3751 For largepic, change: 3752 leaq foo@tlsgd(%rip), %rdi 3753 movabsq $__tls_get_addr@pltoff, %rax 3754 addq %rbx, %rax 3755 call *%rax 3756 into 3757 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1) 3758 movq %fs:0, %eax */ 3759 3760 BFD_ASSERT (r_type == R_X86_64_TPOFF32); 3761 if (ABI_64_P (output_bfd)) 3762 { 3763 if (contents[rel->r_offset + 5] == 0xb8) 3764 memcpy (contents + rel->r_offset - 3, 3765 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0" 3766 "\x64\x48\x8b\x04\x25\0\0\0", 22); 3767 else if (contents[rel->r_offset + 4] == 0xff 3768 || contents[rel->r_offset + 4] == 0x67) 3769 memcpy (contents + rel->r_offset - 3, 3770 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 3771 13); 3772 else 3773 memcpy (contents + rel->r_offset - 3, 3774 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); 3775 } 3776 else 3777 { 3778 if (contents[rel->r_offset + 4] == 0xff) 3779 memcpy (contents + rel->r_offset - 3, 3780 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 3781 13); 3782 else 3783 memcpy (contents + rel->r_offset - 3, 3784 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12); 3785 } 3786 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX 3787 and R_X86_64_PLTOFF64. */ 3788 rel++; 3789 wrel++; 3790 continue; 3791 } 3792 3793 if (htab->elf.sgot == NULL) 3794 abort (); 3795 3796 off = htab->tls_ld_or_ldm_got.offset; 3797 if (off & 1) 3798 off &= ~1; 3799 else 3800 { 3801 Elf_Internal_Rela outrel; 3802 3803 if (htab->elf.srelgot == NULL) 3804 abort (); 3805 3806 outrel.r_offset = (htab->elf.sgot->output_section->vma 3807 + htab->elf.sgot->output_offset + off); 3808 3809 bfd_put_64 (output_bfd, 0, 3810 htab->elf.sgot->contents + off); 3811 bfd_put_64 (output_bfd, 0, 3812 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); 3813 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64); 3814 outrel.r_addend = 0; 3815 elf_append_rela (output_bfd, htab->elf.srelgot, 3816 &outrel); 3817 htab->tls_ld_or_ldm_got.offset |= 1; 3818 } 3819 relocation = htab->elf.sgot->output_section->vma 3820 + htab->elf.sgot->output_offset + off; 3821 unresolved_reloc = FALSE; 3822 break; 3823 3824 case R_X86_64_DTPOFF32: 3825 if (!bfd_link_executable (info) 3826 || (input_section->flags & SEC_CODE) == 0) 3827 relocation -= _bfd_x86_elf_dtpoff_base (info); 3828 else 3829 relocation = elf_x86_64_tpoff (info, relocation); 3830 break; 3831 3832 case R_X86_64_TPOFF32: 3833 case R_X86_64_TPOFF64: 3834 BFD_ASSERT (bfd_link_executable (info)); 3835 relocation = elf_x86_64_tpoff (info, relocation); 3836 break; 3837 3838 case R_X86_64_DTPOFF64: 3839 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0); 3840 relocation -= _bfd_x86_elf_dtpoff_base (info); 3841 break; 3842 3843 default: 3844 break; 3845 } 3846 3847 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3848 because such sections are not SEC_ALLOC and thus ld.so will 3849 not process them. */ 3850 if (unresolved_reloc 3851 && !((input_section->flags & SEC_DEBUGGING) != 0 3852 && h->def_dynamic) 3853 && _bfd_elf_section_offset (output_bfd, info, input_section, 3854 rel->r_offset) != (bfd_vma) -1) 3855 { 3856 switch (r_type) 3857 { 3858 case R_X86_64_32S: 3859 sec = h->root.u.def.section; 3860 if ((info->nocopyreloc 3861 || (eh->def_protected 3862 && elf_has_no_copy_on_protected (h->root.u.def.section->owner))) 3863 && !(h->root.u.def.section->flags & SEC_CODE)) 3864 return elf_x86_64_need_pic (info, input_bfd, input_section, 3865 h, NULL, NULL, howto); 3866 /* Fall through. */ 3867 3868 default: 3869 _bfd_error_handler 3870 /* xgettext:c-format */ 3871 (_("%pB(%pA+%#" PRIx64 "): " 3872 "unresolvable %s relocation against symbol `%s'"), 3873 input_bfd, 3874 input_section, 3875 (uint64_t) rel->r_offset, 3876 howto->name, 3877 h->root.root.string); 3878 return FALSE; 3879 } 3880 } 3881 3882 do_relocation: 3883 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3884 contents, rel->r_offset, 3885 relocation, rel->r_addend); 3886 3887 check_relocation_error: 3888 if (r != bfd_reloc_ok) 3889 { 3890 const char *name; 3891 3892 if (h != NULL) 3893 name = h->root.root.string; 3894 else 3895 { 3896 name = bfd_elf_string_from_elf_section (input_bfd, 3897 symtab_hdr->sh_link, 3898 sym->st_name); 3899 if (name == NULL) 3900 return FALSE; 3901 if (*name == '\0') 3902 name = bfd_section_name (input_bfd, sec); 3903 } 3904 3905 if (r == bfd_reloc_overflow) 3906 { 3907 if (converted_reloc) 3908 { 3909 info->callbacks->einfo 3910 (_("%F%P: failed to convert GOTPCREL relocation; relink with --no-relax\n")); 3911 return FALSE; 3912 } 3913 (*info->callbacks->reloc_overflow) 3914 (info, (h ? &h->root : NULL), name, howto->name, 3915 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 3916 } 3917 else 3918 { 3919 _bfd_error_handler 3920 /* xgettext:c-format */ 3921 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"), 3922 input_bfd, input_section, 3923 (uint64_t) rel->r_offset, name, (int) r); 3924 return FALSE; 3925 } 3926 } 3927 3928 if (wrel != rel) 3929 *wrel = *rel; 3930 } 3931 3932 if (wrel != rel) 3933 { 3934 Elf_Internal_Shdr *rel_hdr; 3935 size_t deleted = rel - wrel; 3936 3937 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); 3938 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; 3939 if (rel_hdr->sh_size == 0) 3940 { 3941 /* It is too late to remove an empty reloc section. Leave 3942 one NONE reloc. 3943 ??? What is wrong with an empty section??? */ 3944 rel_hdr->sh_size = rel_hdr->sh_entsize; 3945 deleted -= 1; 3946 } 3947 rel_hdr = _bfd_elf_single_rel_hdr (input_section); 3948 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; 3949 input_section->reloc_count -= deleted; 3950 } 3951 3952 return TRUE; 3953 } 3954 3955 /* Finish up dynamic symbol handling. We set the contents of various 3956 dynamic sections here. */ 3957 3958 static bfd_boolean 3959 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, 3960 struct bfd_link_info *info, 3961 struct elf_link_hash_entry *h, 3962 Elf_Internal_Sym *sym) 3963 { 3964 struct elf_x86_link_hash_table *htab; 3965 bfd_boolean use_plt_second; 3966 struct elf_x86_link_hash_entry *eh; 3967 bfd_boolean local_undefweak; 3968 3969 htab = elf_x86_hash_table (info, X86_64_ELF_DATA); 3970 if (htab == NULL) 3971 return FALSE; 3972 3973 /* Use the second PLT section only if there is .plt section. */ 3974 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL; 3975 3976 eh = (struct elf_x86_link_hash_entry *) h; 3977 if (eh->no_finish_dynamic_symbol) 3978 abort (); 3979 3980 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for 3981 resolved undefined weak symbols in executable so that their 3982 references have value 0 at run-time. */ 3983 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); 3984 3985 if (h->plt.offset != (bfd_vma) -1) 3986 { 3987 bfd_vma plt_index; 3988 bfd_vma got_offset, plt_offset; 3989 Elf_Internal_Rela rela; 3990 bfd_byte *loc; 3991 asection *plt, *gotplt, *relplt, *resolved_plt; 3992 const struct elf_backend_data *bed; 3993 bfd_vma plt_got_pcrel_offset; 3994 3995 /* When building a static executable, use .iplt, .igot.plt and 3996 .rela.iplt sections for STT_GNU_IFUNC symbols. */ 3997 if (htab->elf.splt != NULL) 3998 { 3999 plt = htab->elf.splt; 4000 gotplt = htab->elf.sgotplt; 4001 relplt = htab->elf.srelplt; 4002 } 4003 else 4004 { 4005 plt = htab->elf.iplt; 4006 gotplt = htab->elf.igotplt; 4007 relplt = htab->elf.irelplt; 4008 } 4009 4010 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak) 4011 4012 /* Get the index in the procedure linkage table which 4013 corresponds to this symbol. This is the index of this symbol 4014 in all the symbols for which we are making plt entries. The 4015 first entry in the procedure linkage table is reserved. 4016 4017 Get the offset into the .got table of the entry that 4018 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE 4019 bytes. The first three are reserved for the dynamic linker. 4020 4021 For static executables, we don't reserve anything. */ 4022 4023 if (plt == htab->elf.splt) 4024 { 4025 got_offset = (h->plt.offset / htab->plt.plt_entry_size 4026 - htab->plt.has_plt0); 4027 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE; 4028 } 4029 else 4030 { 4031 got_offset = h->plt.offset / htab->plt.plt_entry_size; 4032 got_offset = got_offset * GOT_ENTRY_SIZE; 4033 } 4034 4035 /* Fill in the entry in the procedure linkage table. */ 4036 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry, 4037 htab->plt.plt_entry_size); 4038 if (use_plt_second) 4039 { 4040 memcpy (htab->plt_second->contents + eh->plt_second.offset, 4041 htab->non_lazy_plt->plt_entry, 4042 htab->non_lazy_plt->plt_entry_size); 4043 4044 resolved_plt = htab->plt_second; 4045 plt_offset = eh->plt_second.offset; 4046 } 4047 else 4048 { 4049 resolved_plt = plt; 4050 plt_offset = h->plt.offset; 4051 } 4052 4053 /* Insert the relocation positions of the plt section. */ 4054 4055 /* Put offset the PC-relative instruction referring to the GOT entry, 4056 subtracting the size of that instruction. */ 4057 plt_got_pcrel_offset = (gotplt->output_section->vma 4058 + gotplt->output_offset 4059 + got_offset 4060 - resolved_plt->output_section->vma 4061 - resolved_plt->output_offset 4062 - plt_offset 4063 - htab->plt.plt_got_insn_size); 4064 4065 /* Check PC-relative offset overflow in PLT entry. */ 4066 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff) 4067 /* xgettext:c-format */ 4068 info->callbacks->einfo (_("%F%pB: PC-relative offset overflow in PLT entry for `%s'\n"), 4069 output_bfd, h->root.root.string); 4070 4071 bfd_put_32 (output_bfd, plt_got_pcrel_offset, 4072 (resolved_plt->contents + plt_offset 4073 + htab->plt.plt_got_offset)); 4074 4075 /* Fill in the entry in the global offset table, initially this 4076 points to the second part of the PLT entry. Leave the entry 4077 as zero for undefined weak symbol in PIE. No PLT relocation 4078 against undefined weak symbol in PIE. */ 4079 if (!local_undefweak) 4080 { 4081 if (htab->plt.has_plt0) 4082 bfd_put_64 (output_bfd, (plt->output_section->vma 4083 + plt->output_offset 4084 + h->plt.offset 4085 + htab->lazy_plt->plt_lazy_offset), 4086 gotplt->contents + got_offset); 4087 4088 /* Fill in the entry in the .rela.plt section. */ 4089 rela.r_offset = (gotplt->output_section->vma 4090 + gotplt->output_offset 4091 + got_offset); 4092 if (PLT_LOCAL_IFUNC_P (info, h)) 4093 { 4094 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 4095 h->root.root.string, 4096 h->root.u.def.section->owner); 4097 4098 /* If an STT_GNU_IFUNC symbol is locally defined, generate 4099 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */ 4100 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE); 4101 rela.r_addend = (h->root.u.def.value 4102 + h->root.u.def.section->output_section->vma 4103 + h->root.u.def.section->output_offset); 4104 /* R_X86_64_IRELATIVE comes last. */ 4105 plt_index = htab->next_irelative_index--; 4106 } 4107 else 4108 { 4109 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT); 4110 rela.r_addend = 0; 4111 plt_index = htab->next_jump_slot_index++; 4112 } 4113 4114 /* Don't fill the second and third slots in PLT entry for 4115 static executables nor without PLT0. */ 4116 if (plt == htab->elf.splt && htab->plt.has_plt0) 4117 { 4118 bfd_vma plt0_offset 4119 = h->plt.offset + htab->lazy_plt->plt_plt_insn_end; 4120 4121 /* Put relocation index. */ 4122 bfd_put_32 (output_bfd, plt_index, 4123 (plt->contents + h->plt.offset 4124 + htab->lazy_plt->plt_reloc_offset)); 4125 4126 /* Put offset for jmp .PLT0 and check for overflow. We don't 4127 check relocation index for overflow since branch displacement 4128 will overflow first. */ 4129 if (plt0_offset > 0x80000000) 4130 /* xgettext:c-format */ 4131 info->callbacks->einfo (_("%F%pB: branch displacement overflow in PLT entry for `%s'\n"), 4132 output_bfd, h->root.root.string); 4133 bfd_put_32 (output_bfd, - plt0_offset, 4134 (plt->contents + h->plt.offset 4135 + htab->lazy_plt->plt_plt_offset)); 4136 } 4137 4138 bed = get_elf_backend_data (output_bfd); 4139 loc = relplt->contents + plt_index * bed->s->sizeof_rela; 4140 bed->s->swap_reloca_out (output_bfd, &rela, loc); 4141 } 4142 } 4143 else if (eh->plt_got.offset != (bfd_vma) -1) 4144 { 4145 bfd_vma got_offset, plt_offset; 4146 asection *plt, *got; 4147 bfd_boolean got_after_plt; 4148 int32_t got_pcrel_offset; 4149 4150 /* Set the entry in the GOT procedure linkage table. */ 4151 plt = htab->plt_got; 4152 got = htab->elf.sgot; 4153 got_offset = h->got.offset; 4154 4155 if (got_offset == (bfd_vma) -1 4156 || (h->type == STT_GNU_IFUNC && h->def_regular) 4157 || plt == NULL 4158 || got == NULL) 4159 abort (); 4160 4161 /* Use the non-lazy PLT entry template for the GOT PLT since they 4162 are the identical. */ 4163 /* Fill in the entry in the GOT procedure linkage table. */ 4164 plt_offset = eh->plt_got.offset; 4165 memcpy (plt->contents + plt_offset, 4166 htab->non_lazy_plt->plt_entry, 4167 htab->non_lazy_plt->plt_entry_size); 4168 4169 /* Put offset the PC-relative instruction referring to the GOT 4170 entry, subtracting the size of that instruction. */ 4171 got_pcrel_offset = (got->output_section->vma 4172 + got->output_offset 4173 + got_offset 4174 - plt->output_section->vma 4175 - plt->output_offset 4176 - plt_offset 4177 - htab->non_lazy_plt->plt_got_insn_size); 4178 4179 /* Check PC-relative offset overflow in GOT PLT entry. */ 4180 got_after_plt = got->output_section->vma > plt->output_section->vma; 4181 if ((got_after_plt && got_pcrel_offset < 0) 4182 || (!got_after_plt && got_pcrel_offset > 0)) 4183 /* xgettext:c-format */ 4184 info->callbacks->einfo (_("%F%pB: PC-relative offset overflow in GOT PLT entry for `%s'\n"), 4185 output_bfd, h->root.root.string); 4186 4187 bfd_put_32 (output_bfd, got_pcrel_offset, 4188 (plt->contents + plt_offset 4189 + htab->non_lazy_plt->plt_got_offset)); 4190 } 4191 4192 if (!local_undefweak 4193 && !h->def_regular 4194 && (h->plt.offset != (bfd_vma) -1 4195 || eh->plt_got.offset != (bfd_vma) -1)) 4196 { 4197 /* Mark the symbol as undefined, rather than as defined in 4198 the .plt section. Leave the value if there were any 4199 relocations where pointer equality matters (this is a clue 4200 for the dynamic linker, to make function pointer 4201 comparisons work between an application and shared 4202 library), otherwise set it to zero. If a function is only 4203 called from a binary, there is no need to slow down 4204 shared libraries because of that. */ 4205 sym->st_shndx = SHN_UNDEF; 4206 if (!h->pointer_equality_needed) 4207 sym->st_value = 0; 4208 } 4209 4210 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym); 4211 4212 /* Don't generate dynamic GOT relocation against undefined weak 4213 symbol in executable. */ 4214 if (h->got.offset != (bfd_vma) -1 4215 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h)->tls_type) 4216 && elf_x86_hash_entry (h)->tls_type != GOT_TLS_IE 4217 && !local_undefweak) 4218 { 4219 Elf_Internal_Rela rela; 4220 asection *relgot = htab->elf.srelgot; 4221 4222 /* This symbol has an entry in the global offset table. Set it 4223 up. */ 4224 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 4225 abort (); 4226 4227 rela.r_offset = (htab->elf.sgot->output_section->vma 4228 + htab->elf.sgot->output_offset 4229 + (h->got.offset &~ (bfd_vma) 1)); 4230 4231 /* If this is a static link, or it is a -Bsymbolic link and the 4232 symbol is defined locally or was forced to be local because 4233 of a version file, we just want to emit a RELATIVE reloc. 4234 The entry in the global offset table will already have been 4235 initialized in the relocate_section function. */ 4236 if (h->def_regular 4237 && h->type == STT_GNU_IFUNC) 4238 { 4239 if (h->plt.offset == (bfd_vma) -1) 4240 { 4241 /* STT_GNU_IFUNC is referenced without PLT. */ 4242 if (htab->elf.splt == NULL) 4243 { 4244 /* use .rel[a].iplt section to store .got relocations 4245 in static executable. */ 4246 relgot = htab->elf.irelplt; 4247 } 4248 if (SYMBOL_REFERENCES_LOCAL_P (info, h)) 4249 { 4250 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 4251 h->root.root.string, 4252 h->root.u.def.section->owner); 4253 4254 rela.r_info = htab->r_info (0, 4255 R_X86_64_IRELATIVE); 4256 rela.r_addend = (h->root.u.def.value 4257 + h->root.u.def.section->output_section->vma 4258 + h->root.u.def.section->output_offset); 4259 } 4260 else 4261 goto do_glob_dat; 4262 } 4263 else if (bfd_link_pic (info)) 4264 { 4265 /* Generate R_X86_64_GLOB_DAT. */ 4266 goto do_glob_dat; 4267 } 4268 else 4269 { 4270 asection *plt; 4271 bfd_vma plt_offset; 4272 4273 if (!h->pointer_equality_needed) 4274 abort (); 4275 4276 /* For non-shared object, we can't use .got.plt, which 4277 contains the real function addres if we need pointer 4278 equality. We load the GOT entry with the PLT entry. */ 4279 if (htab->plt_second != NULL) 4280 { 4281 plt = htab->plt_second; 4282 plt_offset = eh->plt_second.offset; 4283 } 4284 else 4285 { 4286 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; 4287 plt_offset = h->plt.offset; 4288 } 4289 bfd_put_64 (output_bfd, (plt->output_section->vma 4290 + plt->output_offset 4291 + plt_offset), 4292 htab->elf.sgot->contents + h->got.offset); 4293 return TRUE; 4294 } 4295 } 4296 else if (bfd_link_pic (info) 4297 && SYMBOL_REFERENCES_LOCAL_P (info, h)) 4298 { 4299 if (!SYMBOL_DEFINED_NON_SHARED_P (h)) 4300 return FALSE; 4301 BFD_ASSERT((h->got.offset & 1) != 0); 4302 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE); 4303 rela.r_addend = (h->root.u.def.value 4304 + h->root.u.def.section->output_section->vma 4305 + h->root.u.def.section->output_offset); 4306 } 4307 else 4308 { 4309 BFD_ASSERT((h->got.offset & 1) == 0); 4310 do_glob_dat: 4311 bfd_put_64 (output_bfd, (bfd_vma) 0, 4312 htab->elf.sgot->contents + h->got.offset); 4313 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT); 4314 rela.r_addend = 0; 4315 } 4316 4317 elf_append_rela (output_bfd, relgot, &rela); 4318 } 4319 4320 if (h->needs_copy) 4321 { 4322 Elf_Internal_Rela rela; 4323 asection *s; 4324 4325 /* This symbol needs a copy reloc. Set it up. */ 4326 VERIFY_COPY_RELOC (h, htab) 4327 4328 rela.r_offset = (h->root.u.def.value 4329 + h->root.u.def.section->output_section->vma 4330 + h->root.u.def.section->output_offset); 4331 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY); 4332 rela.r_addend = 0; 4333 if (h->root.u.def.section == htab->elf.sdynrelro) 4334 s = htab->elf.sreldynrelro; 4335 else 4336 s = htab->elf.srelbss; 4337 elf_append_rela (output_bfd, s, &rela); 4338 } 4339 4340 return TRUE; 4341 } 4342 4343 /* Finish up local dynamic symbol handling. We set the contents of 4344 various dynamic sections here. */ 4345 4346 static bfd_boolean 4347 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf) 4348 { 4349 struct elf_link_hash_entry *h 4350 = (struct elf_link_hash_entry *) *slot; 4351 struct bfd_link_info *info 4352 = (struct bfd_link_info *) inf; 4353 4354 return elf_x86_64_finish_dynamic_symbol (info->output_bfd, 4355 info, h, NULL); 4356 } 4357 4358 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry 4359 here since undefined weak symbol may not be dynamic and may not be 4360 called for elf_x86_64_finish_dynamic_symbol. */ 4361 4362 static bfd_boolean 4363 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh, 4364 void *inf) 4365 { 4366 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh; 4367 struct bfd_link_info *info = (struct bfd_link_info *) inf; 4368 4369 if (h->root.type != bfd_link_hash_undefweak 4370 || h->dynindx != -1) 4371 return TRUE; 4372 4373 return elf_x86_64_finish_dynamic_symbol (info->output_bfd, 4374 info, h, NULL); 4375 } 4376 4377 /* Used to decide how to sort relocs in an optimal manner for the 4378 dynamic linker, before writing them out. */ 4379 4380 static enum elf_reloc_type_class 4381 elf_x86_64_reloc_type_class (const struct bfd_link_info *info, 4382 const asection *rel_sec ATTRIBUTE_UNUSED, 4383 const Elf_Internal_Rela *rela) 4384 { 4385 bfd *abfd = info->output_bfd; 4386 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 4387 struct elf_x86_link_hash_table *htab 4388 = elf_x86_hash_table (info, X86_64_ELF_DATA); 4389 4390 if (htab->elf.dynsym != NULL 4391 && htab->elf.dynsym->contents != NULL) 4392 { 4393 /* Check relocation against STT_GNU_IFUNC symbol if there are 4394 dynamic symbols. */ 4395 unsigned long r_symndx = htab->r_sym (rela->r_info); 4396 if (r_symndx != STN_UNDEF) 4397 { 4398 Elf_Internal_Sym sym; 4399 if (!bed->s->swap_symbol_in (abfd, 4400 (htab->elf.dynsym->contents 4401 + r_symndx * bed->s->sizeof_sym), 4402 0, &sym)) 4403 abort (); 4404 4405 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) 4406 return reloc_class_ifunc; 4407 } 4408 } 4409 4410 switch ((int) ELF32_R_TYPE (rela->r_info)) 4411 { 4412 case R_X86_64_IRELATIVE: 4413 return reloc_class_ifunc; 4414 case R_X86_64_RELATIVE: 4415 case R_X86_64_RELATIVE64: 4416 return reloc_class_relative; 4417 case R_X86_64_JUMP_SLOT: 4418 return reloc_class_plt; 4419 case R_X86_64_COPY: 4420 return reloc_class_copy; 4421 default: 4422 return reloc_class_normal; 4423 } 4424 } 4425 4426 /* Finish up the dynamic sections. */ 4427 4428 static bfd_boolean 4429 elf_x86_64_finish_dynamic_sections (bfd *output_bfd, 4430 struct bfd_link_info *info) 4431 { 4432 struct elf_x86_link_hash_table *htab; 4433 4434 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info); 4435 if (htab == NULL) 4436 return FALSE; 4437 4438 if (! htab->elf.dynamic_sections_created) 4439 return TRUE; 4440 4441 if (htab->elf.splt && htab->elf.splt->size > 0) 4442 { 4443 elf_section_data (htab->elf.splt->output_section) 4444 ->this_hdr.sh_entsize = htab->plt.plt_entry_size; 4445 4446 if (htab->plt.has_plt0) 4447 { 4448 /* Fill in the special first entry in the procedure linkage 4449 table. */ 4450 memcpy (htab->elf.splt->contents, 4451 htab->lazy_plt->plt0_entry, 4452 htab->lazy_plt->plt0_entry_size); 4453 /* Add offset for pushq GOT+8(%rip), since the instruction 4454 uses 6 bytes subtract this value. */ 4455 bfd_put_32 (output_bfd, 4456 (htab->elf.sgotplt->output_section->vma 4457 + htab->elf.sgotplt->output_offset 4458 + 8 4459 - htab->elf.splt->output_section->vma 4460 - htab->elf.splt->output_offset 4461 - 6), 4462 (htab->elf.splt->contents 4463 + htab->lazy_plt->plt0_got1_offset)); 4464 /* Add offset for the PC-relative instruction accessing 4465 GOT+16, subtracting the offset to the end of that 4466 instruction. */ 4467 bfd_put_32 (output_bfd, 4468 (htab->elf.sgotplt->output_section->vma 4469 + htab->elf.sgotplt->output_offset 4470 + 16 4471 - htab->elf.splt->output_section->vma 4472 - htab->elf.splt->output_offset 4473 - htab->lazy_plt->plt0_got2_insn_end), 4474 (htab->elf.splt->contents 4475 + htab->lazy_plt->plt0_got2_offset)); 4476 } 4477 4478 if (htab->tlsdesc_plt) 4479 { 4480 bfd_put_64 (output_bfd, (bfd_vma) 0, 4481 htab->elf.sgot->contents + htab->tlsdesc_got); 4482 4483 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt, 4484 htab->lazy_plt->plt_tlsdesc_entry, 4485 htab->lazy_plt->plt_tlsdesc_entry_size); 4486 4487 /* Add offset for pushq GOT+8(%rip), since ENDBR64 uses 4 4488 bytes and the instruction uses 6 bytes, subtract these 4489 values. */ 4490 bfd_put_32 (output_bfd, 4491 (htab->elf.sgotplt->output_section->vma 4492 + htab->elf.sgotplt->output_offset 4493 + 8 4494 - htab->elf.splt->output_section->vma 4495 - htab->elf.splt->output_offset 4496 - htab->tlsdesc_plt 4497 - htab->lazy_plt->plt_tlsdesc_got1_insn_end), 4498 (htab->elf.splt->contents 4499 + htab->tlsdesc_plt 4500 + htab->lazy_plt->plt_tlsdesc_got1_offset)); 4501 /* Add offset for indirect branch via GOT+TDG, where TDG 4502 stands for htab->tlsdesc_got, subtracting the offset 4503 to the end of that instruction. */ 4504 bfd_put_32 (output_bfd, 4505 (htab->elf.sgot->output_section->vma 4506 + htab->elf.sgot->output_offset 4507 + htab->tlsdesc_got 4508 - htab->elf.splt->output_section->vma 4509 - htab->elf.splt->output_offset 4510 - htab->tlsdesc_plt 4511 - htab->lazy_plt->plt_tlsdesc_got2_insn_end), 4512 (htab->elf.splt->contents 4513 + htab->tlsdesc_plt 4514 + htab->lazy_plt->plt_tlsdesc_got2_offset)); 4515 } 4516 } 4517 4518 /* Fill PLT entries for undefined weak symbols in PIE. */ 4519 if (bfd_link_pie (info)) 4520 bfd_hash_traverse (&info->hash->table, 4521 elf_x86_64_pie_finish_undefweak_symbol, 4522 info); 4523 4524 return TRUE; 4525 } 4526 4527 /* Fill PLT/GOT entries and allocate dynamic relocations for local 4528 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table. 4529 It has to be done before elf_link_sort_relocs is called so that 4530 dynamic relocations are properly sorted. */ 4531 4532 static bfd_boolean 4533 elf_x86_64_output_arch_local_syms 4534 (bfd *output_bfd ATTRIBUTE_UNUSED, 4535 struct bfd_link_info *info, 4536 void *flaginfo ATTRIBUTE_UNUSED, 4537 int (*func) (void *, const char *, 4538 Elf_Internal_Sym *, 4539 asection *, 4540 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED) 4541 { 4542 struct elf_x86_link_hash_table *htab 4543 = elf_x86_hash_table (info, X86_64_ELF_DATA); 4544 if (htab == NULL) 4545 return FALSE; 4546 4547 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ 4548 htab_traverse (htab->loc_hash_table, 4549 elf_x86_64_finish_local_dynamic_symbol, 4550 info); 4551 4552 return TRUE; 4553 } 4554 4555 /* Forward declaration. */ 4556 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt; 4557 4558 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all 4559 dynamic relocations. */ 4560 4561 static long 4562 elf_x86_64_get_synthetic_symtab (bfd *abfd, 4563 long symcount ATTRIBUTE_UNUSED, 4564 asymbol **syms ATTRIBUTE_UNUSED, 4565 long dynsymcount, 4566 asymbol **dynsyms, 4567 asymbol **ret) 4568 { 4569 long count, i, n; 4570 int j; 4571 bfd_byte *plt_contents; 4572 long relsize; 4573 const struct elf_x86_lazy_plt_layout *lazy_plt; 4574 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; 4575 const struct elf_x86_lazy_plt_layout *lazy_bnd_plt; 4576 const struct elf_x86_non_lazy_plt_layout *non_lazy_bnd_plt; 4577 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt; 4578 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt; 4579 asection *plt; 4580 enum elf_x86_plt_type plt_type; 4581 struct elf_x86_plt plts[] = 4582 { 4583 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 }, 4584 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }, 4585 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 }, 4586 { ".plt.bnd", NULL, NULL, plt_second, 0, 0, 0, 0 }, 4587 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 } 4588 }; 4589 4590 *ret = NULL; 4591 4592 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0) 4593 return 0; 4594 4595 if (dynsymcount <= 0) 4596 return 0; 4597 4598 relsize = bfd_get_dynamic_reloc_upper_bound (abfd); 4599 if (relsize <= 0) 4600 return -1; 4601 4602 if (get_elf_x86_backend_data (abfd)->target_os != is_nacl) 4603 { 4604 lazy_plt = &elf_x86_64_lazy_plt; 4605 non_lazy_plt = &elf_x86_64_non_lazy_plt; 4606 lazy_bnd_plt = &elf_x86_64_lazy_bnd_plt; 4607 non_lazy_bnd_plt = &elf_x86_64_non_lazy_bnd_plt; 4608 if (ABI_64_P (abfd)) 4609 { 4610 lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt; 4611 non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt; 4612 } 4613 else 4614 { 4615 lazy_ibt_plt = &elf_x32_lazy_ibt_plt; 4616 non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt; 4617 } 4618 } 4619 else 4620 { 4621 lazy_plt = &elf_x86_64_nacl_plt; 4622 non_lazy_plt = NULL; 4623 lazy_bnd_plt = NULL; 4624 non_lazy_bnd_plt = NULL; 4625 lazy_ibt_plt = NULL; 4626 non_lazy_ibt_plt = NULL; 4627 } 4628 4629 count = 0; 4630 for (j = 0; plts[j].name != NULL; j++) 4631 { 4632 plt = bfd_get_section_by_name (abfd, plts[j].name); 4633 if (plt == NULL || plt->size == 0) 4634 continue; 4635 4636 /* Get the PLT section contents. */ 4637 plt_contents = (bfd_byte *) bfd_malloc (plt->size); 4638 if (plt_contents == NULL) 4639 break; 4640 if (!bfd_get_section_contents (abfd, (asection *) plt, 4641 plt_contents, 0, plt->size)) 4642 { 4643 free (plt_contents); 4644 break; 4645 } 4646 4647 /* Check what kind of PLT it is. */ 4648 plt_type = plt_unknown; 4649 if (plts[j].type == plt_unknown 4650 && (plt->size >= (lazy_plt->plt_entry_size 4651 + lazy_plt->plt_entry_size))) 4652 { 4653 /* Match lazy PLT first. Need to check the first two 4654 instructions. */ 4655 if ((memcmp (plt_contents, lazy_plt->plt0_entry, 4656 lazy_plt->plt0_got1_offset) == 0) 4657 && (memcmp (plt_contents + 6, lazy_plt->plt0_entry + 6, 4658 2) == 0)) 4659 plt_type = plt_lazy; 4660 else if (lazy_bnd_plt != NULL 4661 && (memcmp (plt_contents, lazy_bnd_plt->plt0_entry, 4662 lazy_bnd_plt->plt0_got1_offset) == 0) 4663 && (memcmp (plt_contents + 6, 4664 lazy_bnd_plt->plt0_entry + 6, 3) == 0)) 4665 { 4666 plt_type = plt_lazy | plt_second; 4667 /* The fist entry in the lazy IBT PLT is the same as the 4668 lazy BND PLT. */ 4669 if ((memcmp (plt_contents + lazy_ibt_plt->plt_entry_size, 4670 lazy_ibt_plt->plt_entry, 4671 lazy_ibt_plt->plt_got_offset) == 0)) 4672 lazy_plt = lazy_ibt_plt; 4673 else 4674 lazy_plt = lazy_bnd_plt; 4675 } 4676 } 4677 4678 if (non_lazy_plt != NULL 4679 && (plt_type == plt_unknown || plt_type == plt_non_lazy) 4680 && plt->size >= non_lazy_plt->plt_entry_size) 4681 { 4682 /* Match non-lazy PLT. */ 4683 if (memcmp (plt_contents, non_lazy_plt->plt_entry, 4684 non_lazy_plt->plt_got_offset) == 0) 4685 plt_type = plt_non_lazy; 4686 } 4687 4688 if (plt_type == plt_unknown || plt_type == plt_second) 4689 { 4690 if (non_lazy_bnd_plt != NULL 4691 && plt->size >= non_lazy_bnd_plt->plt_entry_size 4692 && (memcmp (plt_contents, non_lazy_bnd_plt->plt_entry, 4693 non_lazy_bnd_plt->plt_got_offset) == 0)) 4694 { 4695 /* Match BND PLT. */ 4696 plt_type = plt_second; 4697 non_lazy_plt = non_lazy_bnd_plt; 4698 } 4699 else if (non_lazy_ibt_plt != NULL 4700 && plt->size >= non_lazy_ibt_plt->plt_entry_size 4701 && (memcmp (plt_contents, 4702 non_lazy_ibt_plt->plt_entry, 4703 non_lazy_ibt_plt->plt_got_offset) == 0)) 4704 { 4705 /* Match IBT PLT. */ 4706 plt_type = plt_second; 4707 non_lazy_plt = non_lazy_ibt_plt; 4708 } 4709 } 4710 4711 if (plt_type == plt_unknown) 4712 { 4713 free (plt_contents); 4714 continue; 4715 } 4716 4717 plts[j].sec = plt; 4718 plts[j].type = plt_type; 4719 4720 if ((plt_type & plt_lazy)) 4721 { 4722 plts[j].plt_got_offset = lazy_plt->plt_got_offset; 4723 plts[j].plt_got_insn_size = lazy_plt->plt_got_insn_size; 4724 plts[j].plt_entry_size = lazy_plt->plt_entry_size; 4725 /* Skip PLT0 in lazy PLT. */ 4726 i = 1; 4727 } 4728 else 4729 { 4730 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset; 4731 plts[j].plt_got_insn_size = non_lazy_plt->plt_got_insn_size; 4732 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size; 4733 i = 0; 4734 } 4735 4736 /* Skip lazy PLT when the second PLT is used. */ 4737 if (plt_type == (plt_lazy | plt_second)) 4738 plts[j].count = 0; 4739 else 4740 { 4741 n = plt->size / plts[j].plt_entry_size; 4742 plts[j].count = n; 4743 count += n - i; 4744 } 4745 4746 plts[j].contents = plt_contents; 4747 } 4748 4749 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize, 4750 (bfd_vma) 0, plts, dynsyms, 4751 ret); 4752 } 4753 4754 /* Handle an x86-64 specific section when reading an object file. This 4755 is called when elfcode.h finds a section with an unknown type. */ 4756 4757 static bfd_boolean 4758 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr, 4759 const char *name, int shindex) 4760 { 4761 if (hdr->sh_type != SHT_X86_64_UNWIND) 4762 return FALSE; 4763 4764 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) 4765 return FALSE; 4766 4767 return TRUE; 4768 } 4769 4770 /* Hook called by the linker routine which adds symbols from an object 4771 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead 4772 of .bss. */ 4773 4774 static bfd_boolean 4775 elf_x86_64_add_symbol_hook (bfd *abfd, 4776 struct bfd_link_info *info ATTRIBUTE_UNUSED, 4777 Elf_Internal_Sym *sym, 4778 const char **namep ATTRIBUTE_UNUSED, 4779 flagword *flagsp ATTRIBUTE_UNUSED, 4780 asection **secp, 4781 bfd_vma *valp) 4782 { 4783 asection *lcomm; 4784 4785 switch (sym->st_shndx) 4786 { 4787 case SHN_X86_64_LCOMMON: 4788 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON"); 4789 if (lcomm == NULL) 4790 { 4791 lcomm = bfd_make_section_with_flags (abfd, 4792 "LARGE_COMMON", 4793 (SEC_ALLOC 4794 | SEC_IS_COMMON 4795 | SEC_LINKER_CREATED)); 4796 if (lcomm == NULL) 4797 return FALSE; 4798 elf_section_flags (lcomm) |= SHF_X86_64_LARGE; 4799 } 4800 *secp = lcomm; 4801 *valp = sym->st_size; 4802 return TRUE; 4803 } 4804 4805 return TRUE; 4806 } 4807 4808 4809 /* Given a BFD section, try to locate the corresponding ELF section 4810 index. */ 4811 4812 static bfd_boolean 4813 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, 4814 asection *sec, int *index_return) 4815 { 4816 if (sec == &_bfd_elf_large_com_section) 4817 { 4818 *index_return = SHN_X86_64_LCOMMON; 4819 return TRUE; 4820 } 4821 return FALSE; 4822 } 4823 4824 /* Process a symbol. */ 4825 4826 static void 4827 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, 4828 asymbol *asym) 4829 { 4830 elf_symbol_type *elfsym = (elf_symbol_type *) asym; 4831 4832 switch (elfsym->internal_elf_sym.st_shndx) 4833 { 4834 case SHN_X86_64_LCOMMON: 4835 asym->section = &_bfd_elf_large_com_section; 4836 asym->value = elfsym->internal_elf_sym.st_size; 4837 /* Common symbol doesn't set BSF_GLOBAL. */ 4838 asym->flags &= ~BSF_GLOBAL; 4839 break; 4840 } 4841 } 4842 4843 static bfd_boolean 4844 elf_x86_64_common_definition (Elf_Internal_Sym *sym) 4845 { 4846 return (sym->st_shndx == SHN_COMMON 4847 || sym->st_shndx == SHN_X86_64_LCOMMON); 4848 } 4849 4850 static unsigned int 4851 elf_x86_64_common_section_index (asection *sec) 4852 { 4853 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) 4854 return SHN_COMMON; 4855 else 4856 return SHN_X86_64_LCOMMON; 4857 } 4858 4859 static asection * 4860 elf_x86_64_common_section (asection *sec) 4861 { 4862 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) 4863 return bfd_com_section_ptr; 4864 else 4865 return &_bfd_elf_large_com_section; 4866 } 4867 4868 static bfd_boolean 4869 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h, 4870 const Elf_Internal_Sym *sym, 4871 asection **psec, 4872 bfd_boolean newdef, 4873 bfd_boolean olddef, 4874 bfd *oldbfd, 4875 const asection *oldsec) 4876 { 4877 /* A normal common symbol and a large common symbol result in a 4878 normal common symbol. We turn the large common symbol into a 4879 normal one. */ 4880 if (!olddef 4881 && h->root.type == bfd_link_hash_common 4882 && !newdef 4883 && bfd_is_com_section (*psec) 4884 && oldsec != *psec) 4885 { 4886 if (sym->st_shndx == SHN_COMMON 4887 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0) 4888 { 4889 h->root.u.c.p->section 4890 = bfd_make_section_old_way (oldbfd, "COMMON"); 4891 h->root.u.c.p->section->flags = SEC_ALLOC; 4892 } 4893 else if (sym->st_shndx == SHN_X86_64_LCOMMON 4894 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0) 4895 *psec = bfd_com_section_ptr; 4896 } 4897 4898 return TRUE; 4899 } 4900 4901 static int 4902 elf_x86_64_additional_program_headers (bfd *abfd, 4903 struct bfd_link_info *info ATTRIBUTE_UNUSED) 4904 { 4905 asection *s; 4906 int count = 0; 4907 4908 /* Check to see if we need a large readonly segment. */ 4909 s = bfd_get_section_by_name (abfd, ".lrodata"); 4910 if (s && (s->flags & SEC_LOAD)) 4911 count++; 4912 4913 /* Check to see if we need a large data segment. Since .lbss sections 4914 is placed right after the .bss section, there should be no need for 4915 a large data segment just because of .lbss. */ 4916 s = bfd_get_section_by_name (abfd, ".ldata"); 4917 if (s && (s->flags & SEC_LOAD)) 4918 count++; 4919 4920 return count; 4921 } 4922 4923 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */ 4924 4925 static bfd_boolean 4926 elf_x86_64_relocs_compatible (const bfd_target *input, 4927 const bfd_target *output) 4928 { 4929 return ((xvec_get_elf_backend_data (input)->s->elfclass 4930 == xvec_get_elf_backend_data (output)->s->elfclass) 4931 && _bfd_elf_relocs_compatible (input, output)); 4932 } 4933 4934 /* Set up x86-64 GNU properties. Return the first relocatable ELF input 4935 with GNU properties if found. Otherwise, return NULL. */ 4936 4937 static bfd * 4938 elf_x86_64_link_setup_gnu_properties (struct bfd_link_info *info) 4939 { 4940 struct elf_x86_init_table init_table; 4941 4942 if ((int) R_X86_64_standard >= (int) R_X86_64_converted_reloc_bit 4943 || (int) R_X86_64_max <= (int) R_X86_64_converted_reloc_bit 4944 || ((int) (R_X86_64_GNU_VTINHERIT | R_X86_64_converted_reloc_bit) 4945 != (int) R_X86_64_GNU_VTINHERIT) 4946 || ((int) (R_X86_64_GNU_VTENTRY | R_X86_64_converted_reloc_bit) 4947 != (int) R_X86_64_GNU_VTENTRY)) 4948 abort (); 4949 4950 /* This is unused for x86-64. */ 4951 init_table.plt0_pad_byte = 0x90; 4952 4953 if (get_elf_x86_backend_data (info->output_bfd)->target_os != is_nacl) 4954 { 4955 if (info->bndplt) 4956 { 4957 init_table.lazy_plt = &elf_x86_64_lazy_bnd_plt; 4958 init_table.non_lazy_plt = &elf_x86_64_non_lazy_bnd_plt; 4959 } 4960 else 4961 { 4962 init_table.lazy_plt = &elf_x86_64_lazy_plt; 4963 init_table.non_lazy_plt = &elf_x86_64_non_lazy_plt; 4964 } 4965 4966 if (ABI_64_P (info->output_bfd)) 4967 { 4968 init_table.lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt; 4969 init_table.non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt; 4970 } 4971 else 4972 { 4973 init_table.lazy_ibt_plt = &elf_x32_lazy_ibt_plt; 4974 init_table.non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt; 4975 } 4976 } 4977 else 4978 { 4979 init_table.lazy_plt = &elf_x86_64_nacl_plt; 4980 init_table.non_lazy_plt = NULL; 4981 init_table.lazy_ibt_plt = NULL; 4982 init_table.non_lazy_ibt_plt = NULL; 4983 } 4984 4985 if (ABI_64_P (info->output_bfd)) 4986 { 4987 init_table.r_info = elf64_r_info; 4988 init_table.r_sym = elf64_r_sym; 4989 } 4990 else 4991 { 4992 init_table.r_info = elf32_r_info; 4993 init_table.r_sym = elf32_r_sym; 4994 } 4995 4996 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table); 4997 } 4998 4999 static const struct bfd_elf_special_section 5000 elf_x86_64_special_sections[]= 5001 { 5002 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, 5003 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, 5004 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE}, 5005 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, 5006 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, 5007 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, 5008 { NULL, 0, 0, 0, 0 } 5009 }; 5010 5011 #define TARGET_LITTLE_SYM x86_64_elf64_vec 5012 #define TARGET_LITTLE_NAME "elf64-x86-64" 5013 #define ELF_ARCH bfd_arch_i386 5014 #define ELF_TARGET_ID X86_64_ELF_DATA 5015 #define ELF_MACHINE_CODE EM_X86_64 5016 #if DEFAULT_LD_Z_SEPARATE_CODE 5017 # define ELF_MAXPAGESIZE 0x1000 5018 #else 5019 # define ELF_MAXPAGESIZE 0x200000 5020 #endif 5021 #define ELF_MINPAGESIZE 0x1000 5022 #define ELF_COMMONPAGESIZE 0x1000 5023 5024 #define elf_backend_can_gc_sections 1 5025 #define elf_backend_can_refcount 1 5026 #define elf_backend_want_got_plt 1 5027 #define elf_backend_plt_readonly 1 5028 #define elf_backend_want_plt_sym 0 5029 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) 5030 #define elf_backend_rela_normal 1 5031 #define elf_backend_plt_alignment 4 5032 #define elf_backend_extern_protected_data 1 5033 #define elf_backend_caches_rawsize 1 5034 #define elf_backend_dtrel_excludes_plt 1 5035 #define elf_backend_want_dynrelro 1 5036 5037 #define elf_info_to_howto elf_x86_64_info_to_howto 5038 5039 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup 5040 #define bfd_elf64_bfd_reloc_name_lookup \ 5041 elf_x86_64_reloc_name_lookup 5042 5043 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible 5044 #define elf_backend_check_relocs elf_x86_64_check_relocs 5045 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections 5046 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections 5047 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol 5048 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms 5049 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus 5050 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo 5051 #ifdef CORE_HEADER 5052 #define elf_backend_write_core_note elf_x86_64_write_core_note 5053 #endif 5054 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class 5055 #define elf_backend_relocate_section elf_x86_64_relocate_section 5056 #define elf_backend_init_index_section _bfd_elf_init_1_index_section 5057 #define elf_backend_object_p elf64_x86_64_elf_object_p 5058 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab 5059 5060 #define elf_backend_section_from_shdr \ 5061 elf_x86_64_section_from_shdr 5062 5063 #define elf_backend_section_from_bfd_section \ 5064 elf_x86_64_elf_section_from_bfd_section 5065 #define elf_backend_add_symbol_hook \ 5066 elf_x86_64_add_symbol_hook 5067 #define elf_backend_symbol_processing \ 5068 elf_x86_64_symbol_processing 5069 #define elf_backend_common_section_index \ 5070 elf_x86_64_common_section_index 5071 #define elf_backend_common_section \ 5072 elf_x86_64_common_section 5073 #define elf_backend_common_definition \ 5074 elf_x86_64_common_definition 5075 #define elf_backend_merge_symbol \ 5076 elf_x86_64_merge_symbol 5077 #define elf_backend_special_sections \ 5078 elf_x86_64_special_sections 5079 #define elf_backend_additional_program_headers \ 5080 elf_x86_64_additional_program_headers 5081 #define elf_backend_setup_gnu_properties \ 5082 elf_x86_64_link_setup_gnu_properties 5083 #define elf_backend_hide_symbol \ 5084 _bfd_x86_elf_hide_symbol 5085 5086 #undef elf64_bed 5087 #define elf64_bed elf64_x86_64_bed 5088 5089 #include "elf64-target.h" 5090 5091 /* CloudABI support. */ 5092 5093 #undef TARGET_LITTLE_SYM 5094 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec 5095 #undef TARGET_LITTLE_NAME 5096 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi" 5097 5098 #undef ELF_OSABI 5099 #define ELF_OSABI ELFOSABI_CLOUDABI 5100 5101 #undef elf64_bed 5102 #define elf64_bed elf64_x86_64_cloudabi_bed 5103 5104 #include "elf64-target.h" 5105 5106 /* FreeBSD support. */ 5107 5108 #undef TARGET_LITTLE_SYM 5109 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec 5110 #undef TARGET_LITTLE_NAME 5111 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd" 5112 5113 #undef ELF_OSABI 5114 #define ELF_OSABI ELFOSABI_FREEBSD 5115 5116 #undef elf64_bed 5117 #define elf64_bed elf64_x86_64_fbsd_bed 5118 5119 #include "elf64-target.h" 5120 5121 /* Solaris 2 support. */ 5122 5123 #undef TARGET_LITTLE_SYM 5124 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec 5125 #undef TARGET_LITTLE_NAME 5126 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2" 5127 5128 static const struct elf_x86_backend_data elf_x86_64_solaris_arch_bed = 5129 { 5130 is_solaris /* os */ 5131 }; 5132 5133 #undef elf_backend_arch_data 5134 #define elf_backend_arch_data &elf_x86_64_solaris_arch_bed 5135 5136 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE 5137 objects won't be recognized. */ 5138 #undef ELF_OSABI 5139 5140 #undef elf64_bed 5141 #define elf64_bed elf64_x86_64_sol2_bed 5142 5143 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte 5144 boundary. */ 5145 #undef elf_backend_static_tls_alignment 5146 #define elf_backend_static_tls_alignment 16 5147 5148 /* The Solaris 2 ABI requires a plt symbol on all platforms. 5149 5150 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output 5151 File, p.63. */ 5152 #undef elf_backend_want_plt_sym 5153 #define elf_backend_want_plt_sym 1 5154 5155 #undef elf_backend_strtab_flags 5156 #define elf_backend_strtab_flags SHF_STRINGS 5157 5158 static bfd_boolean 5159 elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED, 5160 bfd *obfd ATTRIBUTE_UNUSED, 5161 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED, 5162 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED) 5163 { 5164 /* PR 19938: FIXME: Need to add code for setting the sh_info 5165 and sh_link fields of Solaris specific section types. */ 5166 return FALSE; 5167 } 5168 5169 #undef elf_backend_copy_special_section_fields 5170 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields 5171 5172 #include "elf64-target.h" 5173 5174 /* Native Client support. */ 5175 5176 static bfd_boolean 5177 elf64_x86_64_nacl_elf_object_p (bfd *abfd) 5178 { 5179 /* Set the right machine number for a NaCl x86-64 ELF64 file. */ 5180 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl); 5181 return TRUE; 5182 } 5183 5184 #undef TARGET_LITTLE_SYM 5185 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec 5186 #undef TARGET_LITTLE_NAME 5187 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl" 5188 #undef elf64_bed 5189 #define elf64_bed elf64_x86_64_nacl_bed 5190 5191 #undef ELF_MAXPAGESIZE 5192 #undef ELF_MINPAGESIZE 5193 #undef ELF_COMMONPAGESIZE 5194 #define ELF_MAXPAGESIZE 0x10000 5195 #define ELF_MINPAGESIZE 0x10000 5196 #define ELF_COMMONPAGESIZE 0x10000 5197 5198 /* Restore defaults. */ 5199 #undef ELF_OSABI 5200 #undef elf_backend_static_tls_alignment 5201 #undef elf_backend_want_plt_sym 5202 #define elf_backend_want_plt_sym 0 5203 #undef elf_backend_strtab_flags 5204 #undef elf_backend_copy_special_section_fields 5205 5206 /* NaCl uses substantially different PLT entries for the same effects. */ 5207 5208 #undef elf_backend_plt_alignment 5209 #define elf_backend_plt_alignment 5 5210 #define NACL_PLT_ENTRY_SIZE 64 5211 #define NACLMASK 0xe0 /* 32-byte alignment mask. */ 5212 5213 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] = 5214 { 5215 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ 5216 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */ 5217 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */ 5218 0x4d, 0x01, 0xfb, /* add %r15, %r11 */ 5219 0x41, 0xff, 0xe3, /* jmpq *%r11 */ 5220 5221 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */ 5222 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */ 5223 5224 /* 32 bytes of nop to pad out to the standard size. */ 5225 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */ 5226 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ 5227 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */ 5228 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ 5229 0x66, /* excess data16 prefix */ 5230 0x90 /* nop */ 5231 }; 5232 5233 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] = 5234 { 5235 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */ 5236 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */ 5237 0x4d, 0x01, 0xfb, /* add %r15, %r11 */ 5238 0x41, 0xff, 0xe3, /* jmpq *%r11 */ 5239 5240 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */ 5241 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */ 5242 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ 5243 5244 /* Lazy GOT entries point here (32-byte aligned). */ 5245 0x68, /* pushq immediate */ 5246 0, 0, 0, 0, /* replaced with index into relocation table. */ 5247 0xe9, /* jmp relative */ 5248 0, 0, 0, 0, /* replaced with offset to start of .plt0. */ 5249 5250 /* 22 bytes of nop to pad out to the standard size. */ 5251 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */ 5252 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ 5253 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */ 5254 }; 5255 5256 /* .eh_frame covering the .plt section. */ 5257 5258 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] = 5259 { 5260 #if (PLT_CIE_LENGTH != 20 \ 5261 || PLT_FDE_LENGTH != 36 \ 5262 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \ 5263 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12) 5264 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!" 5265 #endif 5266 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 5267 0, 0, 0, 0, /* CIE ID */ 5268 1, /* CIE version */ 5269 'z', 'R', 0, /* Augmentation string */ 5270 1, /* Code alignment factor */ 5271 0x78, /* Data alignment factor */ 5272 16, /* Return address column */ 5273 1, /* Augmentation size */ 5274 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 5275 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ 5276 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ 5277 DW_CFA_nop, DW_CFA_nop, 5278 5279 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 5280 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */ 5281 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ 5282 0, 0, 0, 0, /* .plt size goes here */ 5283 0, /* Augmentation size */ 5284 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ 5285 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 5286 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ 5287 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */ 5288 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 5289 13, /* Block length */ 5290 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ 5291 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ 5292 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge, 5293 DW_OP_lit3, DW_OP_shl, DW_OP_plus, 5294 DW_CFA_nop, DW_CFA_nop 5295 }; 5296 5297 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt = 5298 { 5299 elf_x86_64_nacl_plt0_entry, /* plt0_entry */ 5300 NACL_PLT_ENTRY_SIZE, /* plt0_entry_size */ 5301 elf_x86_64_nacl_plt_entry, /* plt_entry */ 5302 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */ 5303 elf_x86_64_nacl_plt0_entry, /* plt_tlsdesc_entry */ 5304 NACL_PLT_ENTRY_SIZE, /* plt_tlsdesc_entry_size */ 5305 2, /* plt_tlsdesc_got1_offset */ 5306 9, /* plt_tlsdesc_got2_offset */ 5307 6, /* plt_tlsdesc_got1_insn_end */ 5308 13, /* plt_tlsdesc_got2_insn_end */ 5309 2, /* plt0_got1_offset */ 5310 9, /* plt0_got2_offset */ 5311 13, /* plt0_got2_insn_end */ 5312 3, /* plt_got_offset */ 5313 33, /* plt_reloc_offset */ 5314 38, /* plt_plt_offset */ 5315 7, /* plt_got_insn_size */ 5316 42, /* plt_plt_insn_end */ 5317 32, /* plt_lazy_offset */ 5318 elf_x86_64_nacl_plt0_entry, /* pic_plt0_entry */ 5319 elf_x86_64_nacl_plt_entry, /* pic_plt_entry */ 5320 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */ 5321 sizeof (elf_x86_64_nacl_eh_frame_plt) /* eh_frame_plt_size */ 5322 }; 5323 5324 static const struct elf_x86_backend_data elf_x86_64_nacl_arch_bed = 5325 { 5326 is_nacl /* os */ 5327 }; 5328 5329 #undef elf_backend_arch_data 5330 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed 5331 5332 #undef elf_backend_object_p 5333 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p 5334 #undef elf_backend_modify_segment_map 5335 #define elf_backend_modify_segment_map nacl_modify_segment_map 5336 #undef elf_backend_modify_program_headers 5337 #define elf_backend_modify_program_headers nacl_modify_program_headers 5338 #undef elf_backend_final_write_processing 5339 #define elf_backend_final_write_processing nacl_final_write_processing 5340 5341 #include "elf64-target.h" 5342 5343 /* Native Client x32 support. */ 5344 5345 static bfd_boolean 5346 elf32_x86_64_nacl_elf_object_p (bfd *abfd) 5347 { 5348 /* Set the right machine number for a NaCl x86-64 ELF32 file. */ 5349 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl); 5350 return TRUE; 5351 } 5352 5353 #undef TARGET_LITTLE_SYM 5354 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec 5355 #undef TARGET_LITTLE_NAME 5356 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl" 5357 #undef elf32_bed 5358 #define elf32_bed elf32_x86_64_nacl_bed 5359 5360 #define bfd_elf32_bfd_reloc_type_lookup \ 5361 elf_x86_64_reloc_type_lookup 5362 #define bfd_elf32_bfd_reloc_name_lookup \ 5363 elf_x86_64_reloc_name_lookup 5364 #define bfd_elf32_get_synthetic_symtab \ 5365 elf_x86_64_get_synthetic_symtab 5366 5367 #undef elf_backend_object_p 5368 #define elf_backend_object_p \ 5369 elf32_x86_64_nacl_elf_object_p 5370 5371 #undef elf_backend_bfd_from_remote_memory 5372 #define elf_backend_bfd_from_remote_memory \ 5373 _bfd_elf32_bfd_from_remote_memory 5374 5375 #undef elf_backend_size_info 5376 #define elf_backend_size_info \ 5377 _bfd_elf32_size_info 5378 5379 #undef elf32_bed 5380 #define elf32_bed elf32_x86_64_bed 5381 5382 #include "elf32-target.h" 5383 5384 /* Restore defaults. */ 5385 #undef elf_backend_object_p 5386 #define elf_backend_object_p elf64_x86_64_elf_object_p 5387 #undef elf_backend_bfd_from_remote_memory 5388 #undef elf_backend_size_info 5389 #undef elf_backend_modify_segment_map 5390 #undef elf_backend_modify_program_headers 5391 #undef elf_backend_final_write_processing 5392 5393 /* Intel L1OM support. */ 5394 5395 static bfd_boolean 5396 elf64_l1om_elf_object_p (bfd *abfd) 5397 { 5398 /* Set the right machine number for an L1OM elf64 file. */ 5399 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om); 5400 return TRUE; 5401 } 5402 5403 #undef TARGET_LITTLE_SYM 5404 #define TARGET_LITTLE_SYM l1om_elf64_vec 5405 #undef TARGET_LITTLE_NAME 5406 #define TARGET_LITTLE_NAME "elf64-l1om" 5407 #undef ELF_ARCH 5408 #define ELF_ARCH bfd_arch_l1om 5409 5410 #undef ELF_MACHINE_CODE 5411 #define ELF_MACHINE_CODE EM_L1OM 5412 5413 #undef ELF_OSABI 5414 5415 #undef elf64_bed 5416 #define elf64_bed elf64_l1om_bed 5417 5418 #undef elf_backend_object_p 5419 #define elf_backend_object_p elf64_l1om_elf_object_p 5420 5421 /* Restore defaults. */ 5422 #undef ELF_MAXPAGESIZE 5423 #undef ELF_MINPAGESIZE 5424 #undef ELF_COMMONPAGESIZE 5425 #if DEFAULT_LD_Z_SEPARATE_CODE 5426 # define ELF_MAXPAGESIZE 0x1000 5427 #else 5428 # define ELF_MAXPAGESIZE 0x200000 5429 #endif 5430 #define ELF_MINPAGESIZE 0x1000 5431 #define ELF_COMMONPAGESIZE 0x1000 5432 #undef elf_backend_plt_alignment 5433 #define elf_backend_plt_alignment 4 5434 #undef elf_backend_arch_data 5435 #define elf_backend_arch_data &elf_x86_64_arch_bed 5436 5437 #include "elf64-target.h" 5438 5439 /* FreeBSD L1OM support. */ 5440 5441 #undef TARGET_LITTLE_SYM 5442 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec 5443 #undef TARGET_LITTLE_NAME 5444 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd" 5445 5446 #undef ELF_OSABI 5447 #define ELF_OSABI ELFOSABI_FREEBSD 5448 5449 #undef elf64_bed 5450 #define elf64_bed elf64_l1om_fbsd_bed 5451 5452 #include "elf64-target.h" 5453 5454 /* Intel K1OM support. */ 5455 5456 static bfd_boolean 5457 elf64_k1om_elf_object_p (bfd *abfd) 5458 { 5459 /* Set the right machine number for an K1OM elf64 file. */ 5460 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om); 5461 return TRUE; 5462 } 5463 5464 #undef TARGET_LITTLE_SYM 5465 #define TARGET_LITTLE_SYM k1om_elf64_vec 5466 #undef TARGET_LITTLE_NAME 5467 #define TARGET_LITTLE_NAME "elf64-k1om" 5468 #undef ELF_ARCH 5469 #define ELF_ARCH bfd_arch_k1om 5470 5471 #undef ELF_MACHINE_CODE 5472 #define ELF_MACHINE_CODE EM_K1OM 5473 5474 #undef ELF_OSABI 5475 5476 #undef elf64_bed 5477 #define elf64_bed elf64_k1om_bed 5478 5479 #undef elf_backend_object_p 5480 #define elf_backend_object_p elf64_k1om_elf_object_p 5481 5482 #undef elf_backend_static_tls_alignment 5483 5484 #undef elf_backend_want_plt_sym 5485 #define elf_backend_want_plt_sym 0 5486 5487 #include "elf64-target.h" 5488 5489 /* FreeBSD K1OM support. */ 5490 5491 #undef TARGET_LITTLE_SYM 5492 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec 5493 #undef TARGET_LITTLE_NAME 5494 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd" 5495 5496 #undef ELF_OSABI 5497 #define ELF_OSABI ELFOSABI_FREEBSD 5498 5499 #undef elf64_bed 5500 #define elf64_bed elf64_k1om_fbsd_bed 5501 5502 #include "elf64-target.h" 5503 5504 /* 32bit x86-64 support. */ 5505 5506 #undef TARGET_LITTLE_SYM 5507 #define TARGET_LITTLE_SYM x86_64_elf32_vec 5508 #undef TARGET_LITTLE_NAME 5509 #define TARGET_LITTLE_NAME "elf32-x86-64" 5510 #undef elf32_bed 5511 5512 #undef ELF_ARCH 5513 #define ELF_ARCH bfd_arch_i386 5514 5515 #undef ELF_MACHINE_CODE 5516 #define ELF_MACHINE_CODE EM_X86_64 5517 5518 #undef ELF_OSABI 5519 5520 #undef elf_backend_object_p 5521 #define elf_backend_object_p \ 5522 elf32_x86_64_elf_object_p 5523 5524 #undef elf_backend_bfd_from_remote_memory 5525 #define elf_backend_bfd_from_remote_memory \ 5526 _bfd_elf32_bfd_from_remote_memory 5527 5528 #undef elf_backend_size_info 5529 #define elf_backend_size_info \ 5530 _bfd_elf32_size_info 5531 5532 #include "elf32-target.h" 5533