1 /* Intel 80386/80486-specific support for 32-bit ELF 2 Copyright (C) 1993-2022 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21 #include "elfxx-x86.h" 22 #include "elf-vxworks.h" 23 #include "dwarf2.h" 24 #include "opcode/i386.h" 25 26 /* 386 uses REL relocations instead of RELA. */ 27 #define USE_REL 1 28 29 static reloc_howto_type elf_howto_table[]= 30 { 31 HOWTO(R_386_NONE, 0, 0, 0, false, 0, complain_overflow_dont, 32 bfd_elf_generic_reloc, "R_386_NONE", 33 true, 0x00000000, 0x00000000, false), 34 HOWTO(R_386_32, 0, 4, 32, false, 0, complain_overflow_dont, 35 bfd_elf_generic_reloc, "R_386_32", 36 true, 0xffffffff, 0xffffffff, false), 37 HOWTO(R_386_PC32, 0, 4, 32, true, 0, complain_overflow_dont, 38 bfd_elf_generic_reloc, "R_386_PC32", 39 true, 0xffffffff, 0xffffffff, true), 40 HOWTO(R_386_GOT32, 0, 4, 32, false, 0, complain_overflow_dont, 41 bfd_elf_generic_reloc, "R_386_GOT32", 42 true, 0xffffffff, 0xffffffff, false), 43 HOWTO(R_386_PLT32, 0, 4, 32, true, 0, complain_overflow_dont, 44 bfd_elf_generic_reloc, "R_386_PLT32", 45 true, 0xffffffff, 0xffffffff, true), 46 HOWTO(R_386_COPY, 0, 4, 32, false, 0, complain_overflow_dont, 47 bfd_elf_generic_reloc, "R_386_COPY", 48 true, 0xffffffff, 0xffffffff, false), 49 HOWTO(R_386_GLOB_DAT, 0, 4, 32, false, 0, complain_overflow_dont, 50 bfd_elf_generic_reloc, "R_386_GLOB_DAT", 51 true, 0xffffffff, 0xffffffff, false), 52 HOWTO(R_386_JUMP_SLOT, 0, 4, 32, false, 0, complain_overflow_dont, 53 bfd_elf_generic_reloc, "R_386_JUMP_SLOT", 54 true, 0xffffffff, 0xffffffff, false), 55 HOWTO(R_386_RELATIVE, 0, 4, 32, false, 0, complain_overflow_dont, 56 bfd_elf_generic_reloc, "R_386_RELATIVE", 57 true, 0xffffffff, 0xffffffff, false), 58 HOWTO(R_386_GOTOFF, 0, 4, 32, false, 0, complain_overflow_dont, 59 bfd_elf_generic_reloc, "R_386_GOTOFF", 60 true, 0xffffffff, 0xffffffff, false), 61 HOWTO(R_386_GOTPC, 0, 4, 32, true, 0, complain_overflow_dont, 62 bfd_elf_generic_reloc, "R_386_GOTPC", 63 true, 0xffffffff, 0xffffffff, true), 64 65 /* We have a gap in the reloc numbers here. 66 R_386_standard counts the number up to this point, and 67 R_386_ext_offset is the value to subtract from a reloc type of 68 R_386_16 thru R_386_PC8 to form an index into this table. */ 69 #define R_386_standard (R_386_GOTPC + 1) 70 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard) 71 72 /* These relocs are a GNU extension. */ 73 HOWTO(R_386_TLS_TPOFF, 0, 4, 32, false, 0, complain_overflow_dont, 74 bfd_elf_generic_reloc, "R_386_TLS_TPOFF", 75 true, 0xffffffff, 0xffffffff, false), 76 HOWTO(R_386_TLS_IE, 0, 4, 32, false, 0, complain_overflow_dont, 77 bfd_elf_generic_reloc, "R_386_TLS_IE", 78 true, 0xffffffff, 0xffffffff, false), 79 HOWTO(R_386_TLS_GOTIE, 0, 4, 32, false, 0, complain_overflow_dont, 80 bfd_elf_generic_reloc, "R_386_TLS_GOTIE", 81 true, 0xffffffff, 0xffffffff, false), 82 HOWTO(R_386_TLS_LE, 0, 4, 32, false, 0, complain_overflow_dont, 83 bfd_elf_generic_reloc, "R_386_TLS_LE", 84 true, 0xffffffff, 0xffffffff, false), 85 HOWTO(R_386_TLS_GD, 0, 4, 32, false, 0, complain_overflow_dont, 86 bfd_elf_generic_reloc, "R_386_TLS_GD", 87 true, 0xffffffff, 0xffffffff, false), 88 HOWTO(R_386_TLS_LDM, 0, 4, 32, false, 0, complain_overflow_dont, 89 bfd_elf_generic_reloc, "R_386_TLS_LDM", 90 true, 0xffffffff, 0xffffffff, false), 91 HOWTO(R_386_16, 0, 2, 16, false, 0, complain_overflow_bitfield, 92 bfd_elf_generic_reloc, "R_386_16", 93 true, 0xffff, 0xffff, false), 94 HOWTO(R_386_PC16, 0, 2, 16, true, 0, complain_overflow_bitfield, 95 bfd_elf_generic_reloc, "R_386_PC16", 96 true, 0xffff, 0xffff, true), 97 HOWTO(R_386_8, 0, 1, 8, false, 0, complain_overflow_bitfield, 98 bfd_elf_generic_reloc, "R_386_8", 99 true, 0xff, 0xff, false), 100 HOWTO(R_386_PC8, 0, 1, 8, true, 0, complain_overflow_signed, 101 bfd_elf_generic_reloc, "R_386_PC8", 102 true, 0xff, 0xff, true), 103 104 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset) 105 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext) 106 /* These are common with Solaris TLS implementation. */ 107 HOWTO(R_386_TLS_LDO_32, 0, 4, 32, false, 0, complain_overflow_dont, 108 bfd_elf_generic_reloc, "R_386_TLS_LDO_32", 109 true, 0xffffffff, 0xffffffff, false), 110 HOWTO(R_386_TLS_IE_32, 0, 4, 32, false, 0, complain_overflow_dont, 111 bfd_elf_generic_reloc, "R_386_TLS_IE_32", 112 true, 0xffffffff, 0xffffffff, false), 113 HOWTO(R_386_TLS_LE_32, 0, 4, 32, false, 0, complain_overflow_dont, 114 bfd_elf_generic_reloc, "R_386_TLS_LE_32", 115 true, 0xffffffff, 0xffffffff, false), 116 HOWTO(R_386_TLS_DTPMOD32, 0, 4, 32, false, 0, complain_overflow_dont, 117 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32", 118 true, 0xffffffff, 0xffffffff, false), 119 HOWTO(R_386_TLS_DTPOFF32, 0, 4, 32, false, 0, complain_overflow_dont, 120 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32", 121 true, 0xffffffff, 0xffffffff, false), 122 HOWTO(R_386_TLS_TPOFF32, 0, 4, 32, false, 0, complain_overflow_dont, 123 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32", 124 true, 0xffffffff, 0xffffffff, false), 125 HOWTO(R_386_SIZE32, 0, 4, 32, false, 0, complain_overflow_dont, 126 bfd_elf_generic_reloc, "R_386_SIZE32", 127 true, 0xffffffff, 0xffffffff, false), 128 HOWTO(R_386_TLS_GOTDESC, 0, 4, 32, false, 0, complain_overflow_dont, 129 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC", 130 true, 0xffffffff, 0xffffffff, false), 131 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, false, 0, complain_overflow_dont, 132 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL", 133 false, 0, 0, false), 134 HOWTO(R_386_TLS_DESC, 0, 4, 32, false, 0, complain_overflow_dont, 135 bfd_elf_generic_reloc, "R_386_TLS_DESC", 136 true, 0xffffffff, 0xffffffff, false), 137 HOWTO(R_386_IRELATIVE, 0, 4, 32, false, 0, complain_overflow_dont, 138 bfd_elf_generic_reloc, "R_386_IRELATIVE", 139 true, 0xffffffff, 0xffffffff, false), 140 HOWTO(R_386_GOT32X, 0, 4, 32, false, 0, complain_overflow_dont, 141 bfd_elf_generic_reloc, "R_386_GOT32X", 142 true, 0xffffffff, 0xffffffff, false), 143 144 /* Another gap. */ 145 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset) 146 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2) 147 148 /* GNU extension to record C++ vtable hierarchy. */ 149 HOWTO (R_386_GNU_VTINHERIT, /* type */ 150 0, /* rightshift */ 151 4, /* size */ 152 0, /* bitsize */ 153 false, /* pc_relative */ 154 0, /* bitpos */ 155 complain_overflow_dont, /* complain_on_overflow */ 156 NULL, /* special_function */ 157 "R_386_GNU_VTINHERIT", /* name */ 158 false, /* partial_inplace */ 159 0, /* src_mask */ 160 0, /* dst_mask */ 161 false), /* pcrel_offset */ 162 163 /* GNU extension to record C++ vtable member usage. */ 164 HOWTO (R_386_GNU_VTENTRY, /* type */ 165 0, /* rightshift */ 166 4, /* size */ 167 0, /* bitsize */ 168 false, /* pc_relative */ 169 0, /* bitpos */ 170 complain_overflow_dont, /* complain_on_overflow */ 171 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 172 "R_386_GNU_VTENTRY", /* name */ 173 false, /* partial_inplace */ 174 0, /* src_mask */ 175 0, /* dst_mask */ 176 false) /* pcrel_offset */ 177 178 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset) 179 180 }; 181 182 #ifdef DEBUG_GEN_RELOC 183 #define TRACE(str) \ 184 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) 185 #else 186 #define TRACE(str) 187 #endif 188 189 static reloc_howto_type * 190 elf_i386_reloc_type_lookup (bfd *abfd, 191 bfd_reloc_code_real_type code) 192 { 193 switch (code) 194 { 195 case BFD_RELOC_NONE: 196 TRACE ("BFD_RELOC_NONE"); 197 return &elf_howto_table[R_386_NONE]; 198 199 case BFD_RELOC_32: 200 TRACE ("BFD_RELOC_32"); 201 return &elf_howto_table[R_386_32]; 202 203 case BFD_RELOC_CTOR: 204 TRACE ("BFD_RELOC_CTOR"); 205 return &elf_howto_table[R_386_32]; 206 207 case BFD_RELOC_32_PCREL: 208 TRACE ("BFD_RELOC_PC32"); 209 return &elf_howto_table[R_386_PC32]; 210 211 case BFD_RELOC_386_GOT32: 212 TRACE ("BFD_RELOC_386_GOT32"); 213 return &elf_howto_table[R_386_GOT32]; 214 215 case BFD_RELOC_386_PLT32: 216 TRACE ("BFD_RELOC_386_PLT32"); 217 return &elf_howto_table[R_386_PLT32]; 218 219 case BFD_RELOC_386_COPY: 220 TRACE ("BFD_RELOC_386_COPY"); 221 return &elf_howto_table[R_386_COPY]; 222 223 case BFD_RELOC_386_GLOB_DAT: 224 TRACE ("BFD_RELOC_386_GLOB_DAT"); 225 return &elf_howto_table[R_386_GLOB_DAT]; 226 227 case BFD_RELOC_386_JUMP_SLOT: 228 TRACE ("BFD_RELOC_386_JUMP_SLOT"); 229 return &elf_howto_table[R_386_JUMP_SLOT]; 230 231 case BFD_RELOC_386_RELATIVE: 232 TRACE ("BFD_RELOC_386_RELATIVE"); 233 return &elf_howto_table[R_386_RELATIVE]; 234 235 case BFD_RELOC_386_GOTOFF: 236 TRACE ("BFD_RELOC_386_GOTOFF"); 237 return &elf_howto_table[R_386_GOTOFF]; 238 239 case BFD_RELOC_386_GOTPC: 240 TRACE ("BFD_RELOC_386_GOTPC"); 241 return &elf_howto_table[R_386_GOTPC]; 242 243 /* These relocs are a GNU extension. */ 244 case BFD_RELOC_386_TLS_TPOFF: 245 TRACE ("BFD_RELOC_386_TLS_TPOFF"); 246 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset]; 247 248 case BFD_RELOC_386_TLS_IE: 249 TRACE ("BFD_RELOC_386_TLS_IE"); 250 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset]; 251 252 case BFD_RELOC_386_TLS_GOTIE: 253 TRACE ("BFD_RELOC_386_TLS_GOTIE"); 254 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset]; 255 256 case BFD_RELOC_386_TLS_LE: 257 TRACE ("BFD_RELOC_386_TLS_LE"); 258 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset]; 259 260 case BFD_RELOC_386_TLS_GD: 261 TRACE ("BFD_RELOC_386_TLS_GD"); 262 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset]; 263 264 case BFD_RELOC_386_TLS_LDM: 265 TRACE ("BFD_RELOC_386_TLS_LDM"); 266 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset]; 267 268 case BFD_RELOC_16: 269 TRACE ("BFD_RELOC_16"); 270 return &elf_howto_table[R_386_16 - R_386_ext_offset]; 271 272 case BFD_RELOC_16_PCREL: 273 TRACE ("BFD_RELOC_16_PCREL"); 274 return &elf_howto_table[R_386_PC16 - R_386_ext_offset]; 275 276 case BFD_RELOC_8: 277 TRACE ("BFD_RELOC_8"); 278 return &elf_howto_table[R_386_8 - R_386_ext_offset]; 279 280 case BFD_RELOC_8_PCREL: 281 TRACE ("BFD_RELOC_8_PCREL"); 282 return &elf_howto_table[R_386_PC8 - R_386_ext_offset]; 283 284 /* Common with Sun TLS implementation. */ 285 case BFD_RELOC_386_TLS_LDO_32: 286 TRACE ("BFD_RELOC_386_TLS_LDO_32"); 287 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset]; 288 289 case BFD_RELOC_386_TLS_IE_32: 290 TRACE ("BFD_RELOC_386_TLS_IE_32"); 291 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset]; 292 293 case BFD_RELOC_386_TLS_LE_32: 294 TRACE ("BFD_RELOC_386_TLS_LE_32"); 295 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset]; 296 297 case BFD_RELOC_386_TLS_DTPMOD32: 298 TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); 299 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset]; 300 301 case BFD_RELOC_386_TLS_DTPOFF32: 302 TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); 303 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset]; 304 305 case BFD_RELOC_386_TLS_TPOFF32: 306 TRACE ("BFD_RELOC_386_TLS_TPOFF32"); 307 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset]; 308 309 case BFD_RELOC_SIZE32: 310 TRACE ("BFD_RELOC_SIZE32"); 311 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset]; 312 313 case BFD_RELOC_386_TLS_GOTDESC: 314 TRACE ("BFD_RELOC_386_TLS_GOTDESC"); 315 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset]; 316 317 case BFD_RELOC_386_TLS_DESC_CALL: 318 TRACE ("BFD_RELOC_386_TLS_DESC_CALL"); 319 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset]; 320 321 case BFD_RELOC_386_TLS_DESC: 322 TRACE ("BFD_RELOC_386_TLS_DESC"); 323 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset]; 324 325 case BFD_RELOC_386_IRELATIVE: 326 TRACE ("BFD_RELOC_386_IRELATIVE"); 327 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset]; 328 329 case BFD_RELOC_386_GOT32X: 330 TRACE ("BFD_RELOC_386_GOT32X"); 331 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset]; 332 333 case BFD_RELOC_VTABLE_INHERIT: 334 TRACE ("BFD_RELOC_VTABLE_INHERIT"); 335 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset]; 336 337 case BFD_RELOC_VTABLE_ENTRY: 338 TRACE ("BFD_RELOC_VTABLE_ENTRY"); 339 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset]; 340 341 default: 342 TRACE ("Unknown"); 343 /* xgettext:c-format */ 344 _bfd_error_handler (_("%pB: unsupported relocation type: %#x"), 345 abfd, (int) code); 346 bfd_set_error (bfd_error_bad_value); 347 return NULL; 348 } 349 } 350 351 static reloc_howto_type * 352 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 353 const char *r_name) 354 { 355 unsigned int i; 356 357 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) 358 if (elf_howto_table[i].name != NULL 359 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 360 return &elf_howto_table[i]; 361 362 return NULL; 363 } 364 365 static reloc_howto_type * 366 elf_i386_rtype_to_howto (unsigned r_type) 367 { 368 unsigned int indx; 369 370 if ((indx = r_type) >= R_386_standard 371 && ((indx = r_type - R_386_ext_offset) - R_386_standard 372 >= R_386_ext - R_386_standard) 373 && ((indx = r_type - R_386_tls_offset) - R_386_ext 374 >= R_386_ext2 - R_386_ext) 375 && ((indx = r_type - R_386_vt_offset) - R_386_ext2 376 >= R_386_vt - R_386_ext2)) 377 return NULL; 378 /* PR 17512: file: 0f67f69d. */ 379 if (elf_howto_table [indx].type != r_type) 380 return NULL; 381 return &elf_howto_table[indx]; 382 } 383 384 static bool 385 elf_i386_info_to_howto_rel (bfd *abfd, 386 arelent *cache_ptr, 387 Elf_Internal_Rela *dst) 388 { 389 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 390 391 if ((cache_ptr->howto = elf_i386_rtype_to_howto (r_type)) == NULL) 392 { 393 /* xgettext:c-format */ 394 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 395 abfd, r_type); 396 bfd_set_error (bfd_error_bad_value); 397 return false; 398 } 399 400 return true; 401 } 402 403 /* Return whether a symbol name implies a local label. The UnixWare 404 2.1 cc generates temporary symbols that start with .X, so we 405 recognize them here. FIXME: do other SVR4 compilers also use .X?. 406 If so, we should move the .X recognition into 407 _bfd_elf_is_local_label_name. */ 408 409 static bool 410 elf_i386_is_local_label_name (bfd *abfd, const char *name) 411 { 412 if (name[0] == '.' && name[1] == 'X') 413 return true; 414 415 return _bfd_elf_is_local_label_name (abfd, name); 416 } 417 418 /* Support for core dump NOTE sections. */ 419 420 static bool 421 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 422 { 423 int offset; 424 size_t size; 425 426 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 427 { 428 int pr_version = bfd_get_32 (abfd, note->descdata); 429 430 if (pr_version != 1) 431 return false; 432 433 /* pr_cursig */ 434 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20); 435 436 /* pr_pid */ 437 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 438 439 /* pr_reg */ 440 offset = 28; 441 size = bfd_get_32 (abfd, note->descdata + 8); 442 } 443 else 444 { 445 switch (note->descsz) 446 { 447 default: 448 return false; 449 450 case 144: /* Linux/i386 */ 451 /* pr_cursig */ 452 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 453 454 /* pr_pid */ 455 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 456 457 /* pr_reg */ 458 offset = 72; 459 size = 68; 460 461 break; 462 } 463 } 464 465 /* Make a ".reg/999" section. */ 466 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 467 size, note->descpos + offset); 468 } 469 470 static bool 471 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 472 { 473 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 474 { 475 int pr_version = bfd_get_32 (abfd, note->descdata); 476 477 if (pr_version != 1) 478 return false; 479 480 elf_tdata (abfd)->core->program 481 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); 482 elf_tdata (abfd)->core->command 483 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); 484 } 485 else 486 { 487 switch (note->descsz) 488 { 489 default: 490 return false; 491 492 case 124: /* Linux/i386 elf_prpsinfo. */ 493 elf_tdata (abfd)->core->pid 494 = bfd_get_32 (abfd, note->descdata + 12); 495 elf_tdata (abfd)->core->program 496 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 497 elf_tdata (abfd)->core->command 498 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 499 } 500 } 501 502 /* Note that for some reason, a spurious space is tacked 503 onto the end of the args in some (at least one anyway) 504 implementations, so strip it off if it exists. */ 505 { 506 char *command = elf_tdata (abfd)->core->command; 507 int n = strlen (command); 508 509 if (0 < n && command[n - 1] == ' ') 510 command[n - 1] = '\0'; 511 } 512 513 return true; 514 } 515 516 /* Functions for the i386 ELF linker. 517 518 In order to gain some understanding of code in this file without 519 knowing all the intricate details of the linker, note the 520 following: 521 522 Functions named elf_i386_* are called by external routines, other 523 functions are only called locally. elf_i386_* functions appear 524 in this file more or less in the order in which they are called 525 from external routines. eg. elf_i386_scan_relocs is called 526 early in the link process, elf_i386_finish_dynamic_sections is 527 one of the last functions. */ 528 529 /* The size in bytes of an entry in the lazy procedure linkage table. */ 530 531 #define LAZY_PLT_ENTRY_SIZE 16 532 533 /* The size in bytes of an entry in the non-lazy procedure linkage 534 table. */ 535 536 #define NON_LAZY_PLT_ENTRY_SIZE 8 537 538 /* The first entry in an absolute lazy procedure linkage table looks 539 like this. See the SVR4 ABI i386 supplement to see how this works. 540 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */ 541 542 static const bfd_byte elf_i386_lazy_plt0_entry[12] = 543 { 544 0xff, 0x35, /* pushl contents of address */ 545 0, 0, 0, 0, /* replaced with address of .got + 4. */ 546 0xff, 0x25, /* jmp indirect */ 547 0, 0, 0, 0 /* replaced with address of .got + 8. */ 548 }; 549 550 /* Subsequent entries in an absolute lazy procedure linkage table look 551 like this. */ 552 553 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] = 554 { 555 0xff, 0x25, /* jmp indirect */ 556 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ 557 0x68, /* pushl immediate */ 558 0, 0, 0, 0, /* replaced with offset into relocation table. */ 559 0xe9, /* jmp relative */ 560 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 561 }; 562 563 /* The first entry in a PIC lazy procedure linkage table look like 564 this. Will be padded to LAZY_PLT_ENTRY_SIZE with 565 lazy_plt->plt0_pad_byte. */ 566 567 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] = 568 { 569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ 570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */ 571 }; 572 573 /* Subsequent entries in a PIC lazy procedure linkage table look like 574 this. */ 575 576 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] = 577 { 578 0xff, 0xa3, /* jmp *offset(%ebx) */ 579 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 580 0x68, /* pushl immediate */ 581 0, 0, 0, 0, /* replaced with offset into relocation table. */ 582 0xe9, /* jmp relative */ 583 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 584 }; 585 586 /* Entries in the non-lazy procedure linkage table look like this. */ 587 588 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = 589 { 590 0xff, 0x25, /* jmp indirect */ 591 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 592 0x66, 0x90 /* xchg %ax,%ax */ 593 }; 594 595 /* Entries in the PIC non-lazy procedure linkage table look like 596 this. */ 597 598 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = 599 { 600 0xff, 0xa3, /* jmp *offset(%ebx) */ 601 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 602 0x66, 0x90 /* xchg %ax,%ax */ 603 }; 604 605 /* The first entry in an absolute IBT-enabled lazy procedure linkage 606 table looks like this. */ 607 608 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] = 609 { 610 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */ 611 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */ 612 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ 613 }; 614 615 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage 616 table look like this. Subsequent entries for a PIC IBT-enabled lazy 617 procedure linkage table are the same. */ 618 619 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 620 { 621 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */ 622 0x68, 0, 0, 0, 0, /* pushl immediate */ 623 0xe9, 0, 0, 0, 0, /* jmp relative */ 624 0x66, 0x90 /* xchg %ax,%ax */ 625 }; 626 627 /* The first entry in a PIC IBT-enabled lazy procedure linkage table 628 look like. */ 629 630 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] = 631 { 632 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ 633 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ 634 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ 635 }; 636 637 /* Entries for branches with IBT-enabled in the absolute non-lazey 638 procedure linkage table look like this. They have the same size 639 as the lazy PLT entry. */ 640 641 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 642 { 643 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */ 644 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */ 645 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */ 646 }; 647 648 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure 649 linkage table look like this. They have the same size as the lazy 650 PLT entry. */ 651 652 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 653 { 654 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */ 655 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */ 656 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */ 657 }; 658 659 /* .eh_frame covering the lazy .plt section. */ 660 661 static const bfd_byte elf_i386_eh_frame_lazy_plt[] = 662 { 663 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 664 0, 0, 0, 0, /* CIE ID */ 665 1, /* CIE version */ 666 'z', 'R', 0, /* Augmentation string */ 667 1, /* Code alignment factor */ 668 0x7c, /* Data alignment factor */ 669 8, /* Return address column */ 670 1, /* Augmentation size */ 671 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 672 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ 673 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ 674 DW_CFA_nop, DW_CFA_nop, 675 676 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 677 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 678 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ 679 0, 0, 0, 0, /* .plt size goes here */ 680 0, /* Augmentation size */ 681 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ 682 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 683 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ 684 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 685 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 686 11, /* Block length */ 687 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ 688 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ 689 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, 690 DW_OP_lit2, DW_OP_shl, DW_OP_plus, 691 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 692 }; 693 694 /* .eh_frame covering the lazy .plt section with IBT-enabled. */ 695 696 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] = 697 { 698 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 699 0, 0, 0, 0, /* CIE ID */ 700 1, /* CIE version */ 701 'z', 'R', 0, /* Augmentation string */ 702 1, /* Code alignment factor */ 703 0x7c, /* Data alignment factor */ 704 8, /* Return address column */ 705 1, /* Augmentation size */ 706 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 707 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ 708 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ 709 DW_CFA_nop, DW_CFA_nop, 710 711 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 712 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 713 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ 714 0, 0, 0, 0, /* .plt size goes here */ 715 0, /* Augmentation size */ 716 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ 717 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 718 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ 719 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 720 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 721 11, /* Block length */ 722 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ 723 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ 724 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge, 725 DW_OP_lit2, DW_OP_shl, DW_OP_plus, 726 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 727 }; 728 729 /* .eh_frame covering the non-lazy .plt section. */ 730 731 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] = 732 { 733 #define PLT_GOT_FDE_LENGTH 16 734 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 735 0, 0, 0, 0, /* CIE ID */ 736 1, /* CIE version */ 737 'z', 'R', 0, /* Augmentation string */ 738 1, /* Code alignment factor */ 739 0x7c, /* Data alignment factor */ 740 8, /* Return address column */ 741 1, /* Augmentation size */ 742 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 743 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ 744 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ 745 DW_CFA_nop, DW_CFA_nop, 746 747 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 748 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 749 0, 0, 0, 0, /* the start of non-lazy .plt goes here */ 750 0, 0, 0, 0, /* non-lazy .plt size goes here */ 751 0, /* Augmentation size */ 752 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 753 }; 754 755 /* These are the standard parameters. */ 756 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt = 757 { 758 elf_i386_lazy_plt0_entry, /* plt0_entry */ 759 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */ 760 elf_i386_lazy_plt_entry, /* plt_entry */ 761 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 762 NULL, /* plt_tlsdesc_entry */ 763 0, /* plt_tlsdesc_entry_size*/ 764 0, /* plt_tlsdesc_got1_offset */ 765 0, /* plt_tlsdesc_got2_offset */ 766 0, /* plt_tlsdesc_got1_insn_end */ 767 0, /* plt_tlsdesc_got2_insn_end */ 768 2, /* plt0_got1_offset */ 769 8, /* plt0_got2_offset */ 770 0, /* plt0_got2_insn_end */ 771 2, /* plt_got_offset */ 772 7, /* plt_reloc_offset */ 773 12, /* plt_plt_offset */ 774 0, /* plt_got_insn_size */ 775 0, /* plt_plt_insn_end */ 776 6, /* plt_lazy_offset */ 777 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */ 778 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */ 779 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */ 780 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */ 781 }; 782 783 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt = 784 { 785 elf_i386_non_lazy_plt_entry, /* plt_entry */ 786 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */ 787 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 788 2, /* plt_got_offset */ 789 0, /* plt_got_insn_size */ 790 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */ 791 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 792 }; 793 794 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt = 795 { 796 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */ 797 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */ 798 elf_i386_lazy_ibt_plt_entry, /* plt_entry */ 799 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 800 NULL, /* plt_tlsdesc_entry */ 801 0, /* plt_tlsdesc_entry_size*/ 802 0, /* plt_tlsdesc_got1_offset */ 803 0, /* plt_tlsdesc_got2_offset */ 804 0, /* plt_tlsdesc_got1_insn_end */ 805 0, /* plt_tlsdesc_got2_insn_end */ 806 2, /* plt0_got1_offset */ 807 8, /* plt0_got2_offset */ 808 0, /* plt0_got2_insn_end */ 809 4+2, /* plt_got_offset */ 810 4+1, /* plt_reloc_offset */ 811 4+6, /* plt_plt_offset */ 812 0, /* plt_got_insn_size */ 813 0, /* plt_plt_insn_end */ 814 0, /* plt_lazy_offset */ 815 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */ 816 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */ 817 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */ 818 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */ 819 }; 820 821 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt = 822 { 823 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */ 824 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */ 825 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 826 4+2, /* plt_got_offset */ 827 0, /* plt_got_insn_size */ 828 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */ 829 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 830 }; 831 832 833 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations 834 for the PLTResolve stub and then for each PLT entry. */ 835 #define PLTRESOLVE_RELOCS_SHLIB 0 836 #define PLTRESOLVE_RELOCS 2 837 #define PLT_NON_JUMP_SLOT_RELOCS 2 838 839 /* Return TRUE if the TLS access code sequence support transition 840 from R_TYPE. */ 841 842 static bool 843 elf_i386_check_tls_transition (asection *sec, 844 bfd_byte *contents, 845 Elf_Internal_Shdr *symtab_hdr, 846 struct elf_link_hash_entry **sym_hashes, 847 unsigned int r_type, 848 const Elf_Internal_Rela *rel, 849 const Elf_Internal_Rela *relend) 850 { 851 unsigned int val, type, reg; 852 unsigned long r_symndx; 853 struct elf_link_hash_entry *h; 854 bfd_vma offset; 855 bfd_byte *call; 856 bool indirect_call; 857 858 offset = rel->r_offset; 859 switch (r_type) 860 { 861 case R_386_TLS_GD: 862 case R_386_TLS_LDM: 863 if (offset < 2 || (rel + 1) >= relend) 864 return false; 865 866 indirect_call = false; 867 call = contents + offset + 4; 868 val = *(call - 5); 869 type = *(call - 6); 870 if (r_type == R_386_TLS_GD) 871 { 872 /* Check transition from GD access model. Only 873 leal foo@tlsgd(,%ebx,1), %eax 874 call ___tls_get_addr@PLT 875 or 876 leal foo@tlsgd(%ebx) %eax 877 call ___tls_get_addr@PLT 878 nop 879 or 880 leal foo@tlsgd(%reg), %eax 881 call *___tls_get_addr@GOT(%reg) 882 which may be converted to 883 addr32 call ___tls_get_addr 884 can transit to different access model. */ 885 if ((offset + 10) > sec->size 886 || (type != 0x8d && type != 0x04)) 887 return false; 888 889 if (type == 0x04) 890 { 891 /* leal foo@tlsgd(,%ebx,1), %eax 892 call ___tls_get_addr@PLT */ 893 if (offset < 3) 894 return false; 895 896 if (*(call - 7) != 0x8d 897 || val != 0x1d 898 || call[0] != 0xe8) 899 return false; 900 } 901 else 902 { 903 /* This must be 904 leal foo@tlsgd(%ebx), %eax 905 call ___tls_get_addr@PLT 906 nop 907 or 908 leal foo@tlsgd(%reg), %eax 909 call *___tls_get_addr@GOT(%reg) 910 which may be converted to 911 addr32 call ___tls_get_addr 912 913 %eax can't be used as the GOT base register since it 914 is used to pass parameter to ___tls_get_addr. */ 915 reg = val & 7; 916 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0) 917 return false; 918 919 indirect_call = call[0] == 0xff; 920 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90) 921 && !(call[0] == 0x67 && call[1] == 0xe8) 922 && !(indirect_call 923 && (call[1] & 0xf8) == 0x90 924 && (call[1] & 0x7) == reg)) 925 return false; 926 } 927 } 928 else 929 { 930 /* Check transition from LD access model. Only 931 leal foo@tlsldm(%ebx), %eax 932 call ___tls_get_addr@PLT 933 or 934 leal foo@tlsldm(%reg), %eax 935 call *___tls_get_addr@GOT(%reg) 936 which may be converted to 937 addr32 call ___tls_get_addr 938 can transit to different access model. */ 939 if (type != 0x8d || (offset + 9) > sec->size) 940 return false; 941 942 /* %eax can't be used as the GOT base register since it is 943 used to pass parameter to ___tls_get_addr. */ 944 reg = val & 7; 945 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0) 946 return false; 947 948 indirect_call = call[0] == 0xff; 949 if (!(reg == 3 && call[0] == 0xe8) 950 && !(call[0] == 0x67 && call[1] == 0xe8) 951 && !(indirect_call 952 && (call[1] & 0xf8) == 0x90 953 && (call[1] & 0x7) == reg)) 954 return false; 955 } 956 957 r_symndx = ELF32_R_SYM (rel[1].r_info); 958 if (r_symndx < symtab_hdr->sh_info) 959 return false; 960 961 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 962 if (h == NULL 963 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr) 964 return false; 965 else if (indirect_call) 966 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X); 967 else 968 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32 969 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 970 971 case R_386_TLS_IE: 972 /* Check transition from IE access model: 973 movl foo@indntpoff(%rip), %eax 974 movl foo@indntpoff(%rip), %reg 975 addl foo@indntpoff(%rip), %reg 976 */ 977 978 if (offset < 1 || (offset + 4) > sec->size) 979 return false; 980 981 /* Check "movl foo@tpoff(%rip), %eax" first. */ 982 val = bfd_get_8 (abfd, contents + offset - 1); 983 if (val == 0xa1) 984 return true; 985 986 if (offset < 2) 987 return false; 988 989 /* Check movl|addl foo@tpoff(%rip), %reg. */ 990 type = bfd_get_8 (abfd, contents + offset - 2); 991 return ((type == 0x8b || type == 0x03) 992 && (val & 0xc7) == 0x05); 993 994 case R_386_TLS_GOTIE: 995 case R_386_TLS_IE_32: 996 /* Check transition from {IE_32,GOTIE} access model: 997 subl foo@{tpoff,gontoff}(%reg1), %reg2 998 movl foo@{tpoff,gontoff}(%reg1), %reg2 999 addl foo@{tpoff,gontoff}(%reg1), %reg2 1000 */ 1001 1002 if (offset < 2 || (offset + 4) > sec->size) 1003 return false; 1004 1005 val = bfd_get_8 (abfd, contents + offset - 1); 1006 if ((val & 0xc0) != 0x80 || (val & 7) == 4) 1007 return false; 1008 1009 type = bfd_get_8 (abfd, contents + offset - 2); 1010 return type == 0x8b || type == 0x2b || type == 0x03; 1011 1012 case R_386_TLS_GOTDESC: 1013 /* Check transition from GDesc access model: 1014 leal x@tlsdesc(%ebx), %eax 1015 1016 Make sure it's a leal adding ebx to a 32-bit offset 1017 into any register, although it's probably almost always 1018 going to be eax. */ 1019 1020 if (offset < 2 || (offset + 4) > sec->size) 1021 return false; 1022 1023 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) 1024 return false; 1025 1026 val = bfd_get_8 (abfd, contents + offset - 1); 1027 return (val & 0xc7) == 0x83; 1028 1029 case R_386_TLS_DESC_CALL: 1030 /* Check transition from GDesc access model: 1031 call *x@tlsdesc(%eax) 1032 */ 1033 if (offset + 2 <= sec->size) 1034 { 1035 /* Make sure that it's a call *x@tlsdesc(%eax). */ 1036 call = contents + offset; 1037 return call[0] == 0xff && call[1] == 0x10; 1038 } 1039 1040 return false; 1041 1042 default: 1043 abort (); 1044 } 1045 } 1046 1047 /* Return TRUE if the TLS access transition is OK or no transition 1048 will be performed. Update R_TYPE if there is a transition. */ 1049 1050 static bool 1051 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd, 1052 asection *sec, bfd_byte *contents, 1053 Elf_Internal_Shdr *symtab_hdr, 1054 struct elf_link_hash_entry **sym_hashes, 1055 unsigned int *r_type, int tls_type, 1056 const Elf_Internal_Rela *rel, 1057 const Elf_Internal_Rela *relend, 1058 struct elf_link_hash_entry *h, 1059 unsigned long r_symndx, 1060 bool from_relocate_section) 1061 { 1062 unsigned int from_type = *r_type; 1063 unsigned int to_type = from_type; 1064 bool check = true; 1065 1066 /* Skip TLS transition for functions. */ 1067 if (h != NULL 1068 && (h->type == STT_FUNC 1069 || h->type == STT_GNU_IFUNC)) 1070 return true; 1071 1072 switch (from_type) 1073 { 1074 case R_386_TLS_GD: 1075 case R_386_TLS_GOTDESC: 1076 case R_386_TLS_DESC_CALL: 1077 case R_386_TLS_IE_32: 1078 case R_386_TLS_IE: 1079 case R_386_TLS_GOTIE: 1080 if (bfd_link_executable (info)) 1081 { 1082 if (h == NULL) 1083 to_type = R_386_TLS_LE_32; 1084 else if (from_type != R_386_TLS_IE 1085 && from_type != R_386_TLS_GOTIE) 1086 to_type = R_386_TLS_IE_32; 1087 } 1088 1089 /* When we are called from elf_i386_relocate_section, there may 1090 be additional transitions based on TLS_TYPE. */ 1091 if (from_relocate_section) 1092 { 1093 unsigned int new_to_type = to_type; 1094 1095 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type)) 1096 new_to_type = R_386_TLS_LE_32; 1097 1098 if (to_type == R_386_TLS_GD 1099 || to_type == R_386_TLS_GOTDESC 1100 || to_type == R_386_TLS_DESC_CALL) 1101 { 1102 if (tls_type == GOT_TLS_IE_POS) 1103 new_to_type = R_386_TLS_GOTIE; 1104 else if (tls_type & GOT_TLS_IE) 1105 new_to_type = R_386_TLS_IE_32; 1106 } 1107 1108 /* We checked the transition before when we were called from 1109 elf_i386_scan_relocs. We only want to check the new 1110 transition which hasn't been checked before. */ 1111 check = new_to_type != to_type && from_type == to_type; 1112 to_type = new_to_type; 1113 } 1114 1115 break; 1116 1117 case R_386_TLS_LDM: 1118 if (bfd_link_executable (info)) 1119 to_type = R_386_TLS_LE_32; 1120 break; 1121 1122 default: 1123 return true; 1124 } 1125 1126 /* Return TRUE if there is no transition. */ 1127 if (from_type == to_type) 1128 return true; 1129 1130 /* Check if the transition can be performed. */ 1131 if (check 1132 && ! elf_i386_check_tls_transition (sec, contents, 1133 symtab_hdr, sym_hashes, 1134 from_type, rel, relend)) 1135 { 1136 reloc_howto_type *from, *to; 1137 const char *name; 1138 1139 from = elf_i386_rtype_to_howto (from_type); 1140 to = elf_i386_rtype_to_howto (to_type); 1141 1142 if (h) 1143 name = h->root.root.string; 1144 else 1145 { 1146 struct elf_x86_link_hash_table *htab; 1147 1148 htab = elf_x86_hash_table (info, I386_ELF_DATA); 1149 if (htab == NULL) 1150 name = "*unknown*"; 1151 else 1152 { 1153 Elf_Internal_Sym *isym; 1154 1155 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, 1156 abfd, r_symndx); 1157 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); 1158 } 1159 } 1160 1161 _bfd_error_handler 1162 /* xgettext:c-format */ 1163 (_("%pB: TLS transition from %s to %s against `%s'" 1164 " at %#" PRIx64 " in section `%pA' failed"), 1165 abfd, from->name, to->name, name, 1166 (uint64_t) rel->r_offset, sec); 1167 bfd_set_error (bfd_error_bad_value); 1168 return false; 1169 } 1170 1171 *r_type = to_type; 1172 return true; 1173 } 1174 1175 /* With the local symbol, foo, we convert 1176 mov foo@GOT[(%reg1)], %reg2 1177 to 1178 lea foo[@GOTOFF(%reg1)], %reg2 1179 and convert 1180 call/jmp *foo@GOT[(%reg)] 1181 to 1182 nop call foo/jmp foo nop 1183 When PIC is false, convert 1184 test %reg1, foo@GOT[(%reg2)] 1185 to 1186 test $foo, %reg1 1187 and convert 1188 binop foo@GOT[(%reg1)], %reg2 1189 to 1190 binop $foo, %reg2 1191 where binop is one of adc, add, and, cmp, or, sbb, sub, xor 1192 instructions. */ 1193 1194 static 1195 bool 1196 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr, 1197 bfd_byte *contents, 1198 unsigned int *r_type_p, 1199 Elf_Internal_Rela *irel, 1200 struct elf_link_hash_entry *h, 1201 bool *converted, 1202 struct bfd_link_info *link_info) 1203 { 1204 struct elf_x86_link_hash_table *htab; 1205 unsigned int opcode; 1206 unsigned int modrm; 1207 bool baseless; 1208 Elf_Internal_Sym *isym; 1209 unsigned int addend; 1210 unsigned int nop; 1211 bfd_vma nop_offset; 1212 bool is_pic; 1213 bool to_reloc_32; 1214 bool abs_symbol; 1215 unsigned int r_type; 1216 unsigned int r_symndx; 1217 bfd_vma roff = irel->r_offset; 1218 bool local_ref; 1219 struct elf_x86_link_hash_entry *eh; 1220 1221 if (roff < 2) 1222 return true; 1223 1224 /* Addend for R_386_GOT32X relocations must be 0. */ 1225 addend = bfd_get_32 (abfd, contents + roff); 1226 if (addend != 0) 1227 return true; 1228 1229 htab = elf_x86_hash_table (link_info, I386_ELF_DATA); 1230 is_pic = bfd_link_pic (link_info); 1231 1232 r_type = *r_type_p; 1233 r_symndx = ELF32_R_SYM (irel->r_info); 1234 1235 modrm = bfd_get_8 (abfd, contents + roff - 1); 1236 baseless = (modrm & 0xc7) == 0x5; 1237 1238 if (h) 1239 { 1240 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */ 1241 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h); 1242 isym = NULL; 1243 abs_symbol = ABS_SYMBOL_P (h); 1244 } 1245 else 1246 { 1247 local_ref = true; 1248 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, abfd, 1249 r_symndx); 1250 abs_symbol = isym->st_shndx == SHN_ABS; 1251 } 1252 1253 if (baseless && is_pic) 1254 { 1255 /* For PIC, disallow R_386_GOT32X without a base register 1256 since we don't know what the GOT base is. */ 1257 const char *name; 1258 1259 if (h == NULL) 1260 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); 1261 else 1262 name = h->root.root.string; 1263 1264 _bfd_error_handler 1265 /* xgettext:c-format */ 1266 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base" 1267 " register can not be used when making a shared object"), 1268 abfd, name); 1269 return false; 1270 } 1271 1272 opcode = bfd_get_8 (abfd, contents + roff - 2); 1273 1274 /* Convert to R_386_32 if PIC is false or there is no base 1275 register. */ 1276 to_reloc_32 = !is_pic || baseless; 1277 1278 eh = elf_x86_hash_entry (h); 1279 1280 /* Try to convert R_386_GOT32X. Get the symbol referred to by the 1281 reloc. */ 1282 if (h == NULL) 1283 { 1284 if (opcode == 0x0ff) 1285 /* Convert "call/jmp *foo@GOT[(%reg)]". */ 1286 goto convert_branch; 1287 else 1288 /* Convert "mov foo@GOT[(%reg1)], %reg2", 1289 "test %reg1, foo@GOT(%reg2)" and 1290 "binop foo@GOT[(%reg1)], %reg2". */ 1291 goto convert_load; 1292 } 1293 1294 /* Undefined weak symbol is only bound locally in executable 1295 and its reference is resolved as 0. */ 1296 if (h->root.type == bfd_link_hash_undefweak 1297 && !eh->linker_def 1298 && local_ref) 1299 { 1300 if (opcode == 0xff) 1301 { 1302 /* No direct branch to 0 for PIC. */ 1303 if (is_pic) 1304 return true; 1305 else 1306 goto convert_branch; 1307 } 1308 else 1309 { 1310 /* We can convert load of address 0 to R_386_32. */ 1311 to_reloc_32 = true; 1312 goto convert_load; 1313 } 1314 } 1315 1316 if (opcode == 0xff) 1317 { 1318 /* We have "call/jmp *foo@GOT[(%reg)]". */ 1319 if ((h->root.type == bfd_link_hash_defined 1320 || h->root.type == bfd_link_hash_defweak) 1321 && local_ref) 1322 { 1323 /* The function is locally defined. */ 1324 convert_branch: 1325 /* Convert R_386_GOT32X to R_386_PC32. */ 1326 if (modrm == 0x15 || (modrm & 0xf8) == 0x90) 1327 { 1328 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE 1329 is a nop prefix. */ 1330 modrm = 0xe8; 1331 /* To support TLS optimization, always use addr32 prefix 1332 for "call *___tls_get_addr@GOT(%reg)". */ 1333 if (eh && eh->tls_get_addr) 1334 { 1335 nop = 0x67; 1336 nop_offset = irel->r_offset - 2; 1337 } 1338 else 1339 { 1340 nop = htab->params->call_nop_byte; 1341 if (htab->params->call_nop_as_suffix) 1342 { 1343 nop_offset = roff + 3; 1344 irel->r_offset -= 1; 1345 } 1346 else 1347 nop_offset = roff - 2; 1348 } 1349 } 1350 else 1351 { 1352 /* Convert to "jmp foo nop". */ 1353 modrm = 0xe9; 1354 nop = NOP_OPCODE; 1355 nop_offset = roff + 3; 1356 irel->r_offset -= 1; 1357 } 1358 1359 bfd_put_8 (abfd, nop, contents + nop_offset); 1360 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1); 1361 /* When converting to PC-relative relocation, we 1362 need to adjust addend by -4. */ 1363 bfd_put_32 (abfd, -4, contents + irel->r_offset); 1364 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32); 1365 *r_type_p = R_386_PC32; 1366 *converted = true; 1367 } 1368 } 1369 else 1370 { 1371 /* We have "mov foo@GOT[(%re1g)], %reg2", 1372 "test %reg1, foo@GOT(%reg2)" and 1373 "binop foo@GOT[(%reg1)], %reg2". 1374 1375 Avoid optimizing _DYNAMIC since ld.so may use its 1376 link-time address. */ 1377 if (h == htab->elf.hdynamic) 1378 return true; 1379 1380 /* def_regular is set by an assignment in a linker script in 1381 bfd_elf_record_link_assignment. start_stop is set on 1382 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */ 1383 if (h->start_stop 1384 || eh->linker_def 1385 || ((h->def_regular 1386 || h->root.type == bfd_link_hash_defined 1387 || h->root.type == bfd_link_hash_defweak) 1388 && local_ref)) 1389 { 1390 convert_load: 1391 if (opcode == 0x8b) 1392 { 1393 if (abs_symbol && local_ref) 1394 to_reloc_32 = true; 1395 1396 if (to_reloc_32) 1397 { 1398 /* Convert "mov foo@GOT[(%reg1)], %reg2" to 1399 "mov $foo, %reg2" with R_386_32. */ 1400 r_type = R_386_32; 1401 modrm = 0xc0 | (modrm & 0x38) >> 3; 1402 bfd_put_8 (abfd, modrm, contents + roff - 1); 1403 opcode = 0xc7; 1404 } 1405 else 1406 { 1407 /* Convert "mov foo@GOT(%reg1), %reg2" to 1408 "lea foo@GOTOFF(%reg1), %reg2". */ 1409 r_type = R_386_GOTOFF; 1410 opcode = 0x8d; 1411 } 1412 } 1413 else 1414 { 1415 /* Only R_386_32 is supported. */ 1416 if (!to_reloc_32) 1417 return true; 1418 1419 if (opcode == 0x85) 1420 { 1421 /* Convert "test %reg1, foo@GOT(%reg2)" to 1422 "test $foo, %reg1". */ 1423 modrm = 0xc0 | (modrm & 0x38) >> 3; 1424 opcode = 0xf7; 1425 } 1426 else 1427 { 1428 /* Convert "binop foo@GOT(%reg1), %reg2" to 1429 "binop $foo, %reg2". */ 1430 modrm = (0xc0 1431 | (modrm & 0x38) >> 3 1432 | (opcode & 0x3c)); 1433 opcode = 0x81; 1434 } 1435 bfd_put_8 (abfd, modrm, contents + roff - 1); 1436 r_type = R_386_32; 1437 } 1438 1439 bfd_put_8 (abfd, opcode, contents + roff - 2); 1440 irel->r_info = ELF32_R_INFO (r_symndx, r_type); 1441 *r_type_p = r_type; 1442 *converted = true; 1443 } 1444 } 1445 1446 return true; 1447 } 1448 1449 /* Look through the relocs for a section during the first phase, and 1450 calculate needed space in the global offset table, and procedure 1451 linkage table. */ 1452 1453 static bool 1454 elf_i386_scan_relocs (bfd *abfd, 1455 struct bfd_link_info *info, 1456 asection *sec, 1457 const Elf_Internal_Rela *relocs) 1458 { 1459 struct elf_x86_link_hash_table *htab; 1460 Elf_Internal_Shdr *symtab_hdr; 1461 struct elf_link_hash_entry **sym_hashes; 1462 const Elf_Internal_Rela *rel; 1463 const Elf_Internal_Rela *rel_end; 1464 bfd_byte *contents; 1465 bool converted; 1466 1467 if (bfd_link_relocatable (info)) 1468 return true; 1469 1470 htab = elf_x86_hash_table (info, I386_ELF_DATA); 1471 if (htab == NULL) 1472 { 1473 sec->check_relocs_failed = 1; 1474 return false; 1475 } 1476 1477 BFD_ASSERT (is_x86_elf (abfd, htab)); 1478 1479 /* Get the section contents. */ 1480 if (elf_section_data (sec)->this_hdr.contents != NULL) 1481 contents = elf_section_data (sec)->this_hdr.contents; 1482 else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1483 { 1484 sec->check_relocs_failed = 1; 1485 return false; 1486 } 1487 1488 symtab_hdr = &elf_symtab_hdr (abfd); 1489 sym_hashes = elf_sym_hashes (abfd); 1490 1491 converted = false; 1492 1493 rel_end = relocs + sec->reloc_count; 1494 for (rel = relocs; rel < rel_end; rel++) 1495 { 1496 unsigned int r_type; 1497 unsigned int r_symndx; 1498 struct elf_link_hash_entry *h; 1499 struct elf_x86_link_hash_entry *eh; 1500 Elf_Internal_Sym *isym; 1501 const char *name; 1502 bool size_reloc; 1503 bool no_dynreloc; 1504 1505 r_symndx = ELF32_R_SYM (rel->r_info); 1506 r_type = ELF32_R_TYPE (rel->r_info); 1507 1508 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 1509 { 1510 /* xgettext:c-format */ 1511 _bfd_error_handler (_("%pB: bad symbol index: %d"), 1512 abfd, r_symndx); 1513 goto error_return; 1514 } 1515 1516 if (r_symndx < symtab_hdr->sh_info) 1517 { 1518 /* A local symbol. */ 1519 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, 1520 abfd, r_symndx); 1521 if (isym == NULL) 1522 goto error_return; 1523 1524 /* Check relocation against local STT_GNU_IFUNC symbol. */ 1525 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1526 { 1527 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, true); 1528 if (h == NULL) 1529 goto error_return; 1530 1531 /* Fake a STT_GNU_IFUNC symbol. */ 1532 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr, 1533 isym, NULL); 1534 h->type = STT_GNU_IFUNC; 1535 h->def_regular = 1; 1536 h->ref_regular = 1; 1537 h->forced_local = 1; 1538 h->root.type = bfd_link_hash_defined; 1539 } 1540 else 1541 h = NULL; 1542 } 1543 else 1544 { 1545 isym = NULL; 1546 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1547 while (h->root.type == bfd_link_hash_indirect 1548 || h->root.type == bfd_link_hash_warning) 1549 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1550 } 1551 1552 eh = (struct elf_x86_link_hash_entry *) h; 1553 if (h != NULL) 1554 { 1555 if (r_type == R_386_GOTOFF) 1556 eh->gotoff_ref = 1; 1557 1558 /* It is referenced by a non-shared object. */ 1559 h->ref_regular = 1; 1560 } 1561 1562 if (r_type == R_386_GOT32X 1563 && (h == NULL || h->type != STT_GNU_IFUNC)) 1564 { 1565 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel; 1566 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents, 1567 &r_type, irel, h, 1568 &converted, info)) 1569 goto error_return; 1570 } 1571 1572 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym, 1573 symtab_hdr, &no_dynreloc)) 1574 return false; 1575 1576 if (! elf_i386_tls_transition (info, abfd, sec, contents, 1577 symtab_hdr, sym_hashes, 1578 &r_type, GOT_UNKNOWN, 1579 rel, rel_end, h, r_symndx, false)) 1580 goto error_return; 1581 1582 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */ 1583 if (h == htab->elf.hgot) 1584 htab->got_referenced = true; 1585 1586 switch (r_type) 1587 { 1588 case R_386_TLS_LDM: 1589 htab->tls_ld_or_ldm_got.refcount = 1; 1590 goto create_got; 1591 1592 case R_386_PLT32: 1593 /* This symbol requires a procedure linkage table entry. We 1594 actually build the entry in adjust_dynamic_symbol, 1595 because this might be a case of linking PIC code which is 1596 never referenced by a dynamic object, in which case we 1597 don't need to generate a procedure linkage table entry 1598 after all. */ 1599 1600 /* If this is a local symbol, we resolve it directly without 1601 creating a procedure linkage table entry. */ 1602 if (h == NULL) 1603 continue; 1604 1605 eh->zero_undefweak &= 0x2; 1606 h->needs_plt = 1; 1607 h->plt.refcount = 1; 1608 break; 1609 1610 case R_386_SIZE32: 1611 size_reloc = true; 1612 goto do_size; 1613 1614 case R_386_TLS_IE_32: 1615 case R_386_TLS_IE: 1616 case R_386_TLS_GOTIE: 1617 if (!bfd_link_executable (info)) 1618 info->flags |= DF_STATIC_TLS; 1619 /* Fall through */ 1620 1621 case R_386_GOT32: 1622 case R_386_GOT32X: 1623 case R_386_TLS_GD: 1624 case R_386_TLS_GOTDESC: 1625 case R_386_TLS_DESC_CALL: 1626 /* This symbol requires a global offset table entry. */ 1627 { 1628 int tls_type, old_tls_type; 1629 1630 switch (r_type) 1631 { 1632 default: 1633 case R_386_GOT32: 1634 case R_386_GOT32X: 1635 tls_type = GOT_NORMAL; 1636 break; 1637 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; 1638 case R_386_TLS_GOTDESC: 1639 case R_386_TLS_DESC_CALL: 1640 tls_type = GOT_TLS_GDESC; break; 1641 case R_386_TLS_IE_32: 1642 if (ELF32_R_TYPE (rel->r_info) == r_type) 1643 tls_type = GOT_TLS_IE_NEG; 1644 else 1645 /* If this is a GD->IE transition, we may use either of 1646 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ 1647 tls_type = GOT_TLS_IE; 1648 break; 1649 case R_386_TLS_IE: 1650 case R_386_TLS_GOTIE: 1651 tls_type = GOT_TLS_IE_POS; break; 1652 } 1653 1654 if (h != NULL) 1655 { 1656 h->got.refcount = 1; 1657 old_tls_type = elf_x86_hash_entry (h)->tls_type; 1658 } 1659 else 1660 { 1661 bfd_signed_vma *local_got_refcounts; 1662 1663 if (!elf_x86_allocate_local_got_info (abfd, 1664 symtab_hdr->sh_info)) 1665 goto error_return; 1666 1667 /* This is a global offset table entry for a local symbol. */ 1668 local_got_refcounts = elf_local_got_refcounts (abfd); 1669 local_got_refcounts[r_symndx] = 1; 1670 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx]; 1671 } 1672 1673 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) 1674 tls_type |= old_tls_type; 1675 /* If a TLS symbol is accessed using IE at least once, 1676 there is no point to use dynamic model for it. */ 1677 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN 1678 && (! GOT_TLS_GD_ANY_P (old_tls_type) 1679 || (tls_type & GOT_TLS_IE) == 0)) 1680 { 1681 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type)) 1682 tls_type = old_tls_type; 1683 else if (GOT_TLS_GD_ANY_P (old_tls_type) 1684 && GOT_TLS_GD_ANY_P (tls_type)) 1685 tls_type |= old_tls_type; 1686 else 1687 { 1688 if (h) 1689 name = h->root.root.string; 1690 else 1691 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, 1692 NULL); 1693 _bfd_error_handler 1694 /* xgettext:c-format */ 1695 (_("%pB: `%s' accessed both as normal and " 1696 "thread local symbol"), 1697 abfd, name); 1698 bfd_set_error (bfd_error_bad_value); 1699 goto error_return; 1700 } 1701 } 1702 1703 if (old_tls_type != tls_type) 1704 { 1705 if (h != NULL) 1706 elf_x86_hash_entry (h)->tls_type = tls_type; 1707 else 1708 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type; 1709 } 1710 } 1711 /* Fall through */ 1712 1713 case R_386_GOTOFF: 1714 case R_386_GOTPC: 1715 create_got: 1716 if (r_type != R_386_TLS_IE) 1717 { 1718 if (eh != NULL) 1719 { 1720 eh->zero_undefweak &= 0x2; 1721 1722 /* Need GOT to resolve undefined weak symbol to 0. */ 1723 if (r_type == R_386_GOTOFF 1724 && h->root.type == bfd_link_hash_undefweak 1725 && bfd_link_executable (info)) 1726 htab->got_referenced = true; 1727 } 1728 break; 1729 } 1730 /* Fall through */ 1731 1732 case R_386_TLS_LE_32: 1733 case R_386_TLS_LE: 1734 if (eh != NULL) 1735 eh->zero_undefweak &= 0x2; 1736 if (bfd_link_executable (info)) 1737 break; 1738 info->flags |= DF_STATIC_TLS; 1739 goto do_relocation; 1740 1741 case R_386_32: 1742 case R_386_PC32: 1743 if (eh != NULL && (sec->flags & SEC_CODE) != 0) 1744 eh->zero_undefweak |= 0x2; 1745 do_relocation: 1746 /* We are called after all symbols have been resolved. Only 1747 relocation against STT_GNU_IFUNC symbol must go through 1748 PLT. */ 1749 if (h != NULL 1750 && (bfd_link_executable (info) 1751 || h->type == STT_GNU_IFUNC)) 1752 { 1753 bool func_pointer_ref = false; 1754 1755 if (r_type == R_386_PC32) 1756 { 1757 /* Since something like ".long foo - ." may be used 1758 as pointer, make sure that PLT is used if foo is 1759 a function defined in a shared library. */ 1760 if ((sec->flags & SEC_CODE) == 0) 1761 h->pointer_equality_needed = 1; 1762 else if (h->type == STT_GNU_IFUNC 1763 && bfd_link_pic (info)) 1764 { 1765 _bfd_error_handler 1766 /* xgettext:c-format */ 1767 (_("%pB: unsupported non-PIC call to IFUNC `%s'"), 1768 abfd, h->root.root.string); 1769 bfd_set_error (bfd_error_bad_value); 1770 goto error_return; 1771 } 1772 } 1773 else 1774 { 1775 /* R_386_32 can be resolved at run-time. Function 1776 pointer reference doesn't need PLT for pointer 1777 equality. */ 1778 if (r_type == R_386_32 1779 && (sec->flags & SEC_READONLY) == 0) 1780 func_pointer_ref = true; 1781 1782 /* IFUNC symbol needs pointer equality in PDE so that 1783 function pointer reference will be resolved to its 1784 PLT entry directly. */ 1785 if (!func_pointer_ref 1786 || (bfd_link_pde (info) 1787 && h->type == STT_GNU_IFUNC)) 1788 h->pointer_equality_needed = 1; 1789 } 1790 1791 if (!func_pointer_ref) 1792 { 1793 /* If this reloc is in a read-only section, we might 1794 need a copy reloc. We can't check reliably at this 1795 stage whether the section is read-only, as input 1796 sections have not yet been mapped to output sections. 1797 Tentatively set the flag for now, and correct in 1798 adjust_dynamic_symbol. */ 1799 h->non_got_ref = 1; 1800 1801 if (!elf_has_indirect_extern_access (sec->owner)) 1802 eh->non_got_ref_without_indirect_extern_access = 1; 1803 1804 /* We may need a .plt entry if the symbol is a function 1805 defined in a shared lib or is a function referenced 1806 from the code or read-only section. */ 1807 if (!h->def_regular 1808 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0) 1809 h->plt.refcount = 1; 1810 1811 if (htab->elf.target_os != is_solaris 1812 && h->pointer_equality_needed 1813 && h->type == STT_FUNC 1814 && eh->def_protected 1815 && !SYMBOL_DEFINED_NON_SHARED_P (h) 1816 && h->def_dynamic) 1817 { 1818 /* Disallow non-canonical reference to canonical 1819 protected function. */ 1820 _bfd_error_handler 1821 /* xgettext:c-format */ 1822 (_("%pB: non-canonical reference to canonical " 1823 "protected function `%s' in %pB"), 1824 abfd, h->root.root.string, 1825 h->root.u.def.section->owner); 1826 bfd_set_error (bfd_error_bad_value); 1827 goto error_return; 1828 } 1829 } 1830 } 1831 1832 size_reloc = false; 1833 do_size: 1834 if (!no_dynreloc 1835 && NEED_DYNAMIC_RELOCATION_P (false, info, false, h, sec, 1836 r_type, R_386_32)) 1837 { 1838 struct elf_dyn_relocs *p; 1839 struct elf_dyn_relocs **head; 1840 1841 /* If this is a global symbol, we count the number of 1842 relocations we need for this symbol. */ 1843 if (h != NULL) 1844 { 1845 head = &h->dyn_relocs; 1846 } 1847 else 1848 { 1849 /* Track dynamic relocs needed for local syms too. 1850 We really need local syms available to do this 1851 easily. Oh well. */ 1852 void **vpp; 1853 asection *s; 1854 1855 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, 1856 abfd, r_symndx); 1857 if (isym == NULL) 1858 goto error_return; 1859 1860 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 1861 if (s == NULL) 1862 s = sec; 1863 1864 vpp = &elf_section_data (s)->local_dynrel; 1865 head = (struct elf_dyn_relocs **)vpp; 1866 } 1867 1868 p = *head; 1869 if (p == NULL || p->sec != sec) 1870 { 1871 size_t amt = sizeof *p; 1872 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj, 1873 amt); 1874 if (p == NULL) 1875 goto error_return; 1876 p->next = *head; 1877 *head = p; 1878 p->sec = sec; 1879 p->count = 0; 1880 p->pc_count = 0; 1881 } 1882 1883 p->count += 1; 1884 /* Count size relocation as PC-relative relocation. */ 1885 if (r_type == R_386_PC32 || size_reloc) 1886 p->pc_count += 1; 1887 } 1888 break; 1889 1890 /* This relocation describes the C++ object vtable hierarchy. 1891 Reconstruct it for later use during GC. */ 1892 case R_386_GNU_VTINHERIT: 1893 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1894 goto error_return; 1895 break; 1896 1897 /* This relocation describes which C++ vtable entries are actually 1898 used. Record for later use during GC. */ 1899 case R_386_GNU_VTENTRY: 1900 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 1901 goto error_return; 1902 break; 1903 1904 default: 1905 break; 1906 } 1907 } 1908 1909 if (elf_section_data (sec)->this_hdr.contents != contents) 1910 { 1911 if (!converted && !_bfd_link_keep_memory (info)) 1912 free (contents); 1913 else 1914 { 1915 /* Cache the section contents for elf_link_input_bfd if any 1916 load is converted or --no-keep-memory isn't used. */ 1917 elf_section_data (sec)->this_hdr.contents = contents; 1918 info->cache_size += sec->size; 1919 } 1920 } 1921 1922 /* Cache relocations if any load is converted. */ 1923 if (elf_section_data (sec)->relocs != relocs && converted) 1924 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs; 1925 1926 return true; 1927 1928 error_return: 1929 if (elf_section_data (sec)->this_hdr.contents != contents) 1930 free (contents); 1931 sec->check_relocs_failed = 1; 1932 return false; 1933 } 1934 1935 static bool 1936 elf_i386_always_size_sections (bfd *output_bfd, 1937 struct bfd_link_info *info) 1938 { 1939 bfd *abfd; 1940 1941 /* Scan relocations after rel_from_abs has been set on __ehdr_start. */ 1942 for (abfd = info->input_bfds; 1943 abfd != (bfd *) NULL; 1944 abfd = abfd->link.next) 1945 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour 1946 && !_bfd_elf_link_iterate_on_relocs (abfd, info, 1947 elf_i386_scan_relocs)) 1948 return false; 1949 1950 return _bfd_x86_elf_always_size_sections (output_bfd, info); 1951 } 1952 1953 /* Set the correct type for an x86 ELF section. We do this by the 1954 section name, which is a hack, but ought to work. */ 1955 1956 static bool 1957 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, 1958 Elf_Internal_Shdr *hdr, 1959 asection *sec) 1960 { 1961 const char *name; 1962 1963 name = bfd_section_name (sec); 1964 1965 /* This is an ugly, but unfortunately necessary hack that is 1966 needed when producing EFI binaries on x86. It tells 1967 elf.c:elf_fake_sections() not to consider ".reloc" as a section 1968 containing ELF relocation info. We need this hack in order to 1969 be able to generate ELF binaries that can be translated into 1970 EFI applications (which are essentially COFF objects). Those 1971 files contain a COFF ".reloc" section inside an ELFNN object, 1972 which would normally cause BFD to segfault because it would 1973 attempt to interpret this section as containing relocation 1974 entries for section "oc". With this hack enabled, ".reloc" 1975 will be treated as a normal data section, which will avoid the 1976 segfault. However, you won't be able to create an ELFNN binary 1977 with a section named "oc" that needs relocations, but that's 1978 the kind of ugly side-effects you get when detecting section 1979 types based on their names... In practice, this limitation is 1980 unlikely to bite. */ 1981 if (strcmp (name, ".reloc") == 0) 1982 hdr->sh_type = SHT_PROGBITS; 1983 1984 return true; 1985 } 1986 1987 /* Return the relocation value for @tpoff relocation 1988 if STT_TLS virtual address is ADDRESS. */ 1989 1990 static bfd_vma 1991 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address) 1992 { 1993 struct elf_link_hash_table *htab = elf_hash_table (info); 1994 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); 1995 bfd_vma static_tls_size; 1996 1997 /* If tls_sec is NULL, we should have signalled an error already. */ 1998 if (htab->tls_sec == NULL) 1999 return 0; 2000 2001 /* Consider special static TLS alignment requirements. */ 2002 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); 2003 return static_tls_size + htab->tls_sec->vma - address; 2004 } 2005 2006 /* Relocate an i386 ELF section. */ 2007 2008 static int 2009 elf_i386_relocate_section (bfd *output_bfd, 2010 struct bfd_link_info *info, 2011 bfd *input_bfd, 2012 asection *input_section, 2013 bfd_byte *contents, 2014 Elf_Internal_Rela *relocs, 2015 Elf_Internal_Sym *local_syms, 2016 asection **local_sections) 2017 { 2018 struct elf_x86_link_hash_table *htab; 2019 Elf_Internal_Shdr *symtab_hdr; 2020 struct elf_link_hash_entry **sym_hashes; 2021 bfd_vma *local_got_offsets; 2022 bfd_vma *local_tlsdesc_gotents; 2023 Elf_Internal_Rela *rel; 2024 Elf_Internal_Rela *wrel; 2025 Elf_Internal_Rela *relend; 2026 bool is_vxworks_tls; 2027 unsigned plt_entry_size; 2028 2029 /* Skip if check_relocs or scan_relocs failed. */ 2030 if (input_section->check_relocs_failed) 2031 return false; 2032 2033 htab = elf_x86_hash_table (info, I386_ELF_DATA); 2034 if (htab == NULL) 2035 return false; 2036 2037 if (!is_x86_elf (input_bfd, htab)) 2038 { 2039 bfd_set_error (bfd_error_wrong_format); 2040 return false; 2041 } 2042 2043 symtab_hdr = &elf_symtab_hdr (input_bfd); 2044 sym_hashes = elf_sym_hashes (input_bfd); 2045 local_got_offsets = elf_local_got_offsets (input_bfd); 2046 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd); 2047 /* We have to handle relocations in vxworks .tls_vars sections 2048 specially, because the dynamic loader is 'weird'. */ 2049 is_vxworks_tls = (htab->elf.target_os == is_vxworks 2050 && bfd_link_pic (info) 2051 && !strcmp (input_section->output_section->name, 2052 ".tls_vars")); 2053 2054 _bfd_x86_elf_set_tls_module_base (info); 2055 2056 plt_entry_size = htab->plt.plt_entry_size; 2057 2058 rel = wrel = relocs; 2059 relend = relocs + input_section->reloc_count; 2060 for (; rel < relend; wrel++, rel++) 2061 { 2062 unsigned int r_type, r_type_tls; 2063 reloc_howto_type *howto; 2064 unsigned long r_symndx; 2065 struct elf_link_hash_entry *h; 2066 struct elf_x86_link_hash_entry *eh; 2067 Elf_Internal_Sym *sym; 2068 asection *sec; 2069 bfd_vma off, offplt, plt_offset; 2070 bfd_vma relocation; 2071 bool unresolved_reloc; 2072 bfd_reloc_status_type r; 2073 unsigned int indx; 2074 int tls_type; 2075 bfd_vma st_size; 2076 asection *resolved_plt; 2077 bool resolved_to_zero; 2078 bool relative_reloc; 2079 2080 r_type = ELF32_R_TYPE (rel->r_info); 2081 if (r_type == R_386_GNU_VTINHERIT 2082 || r_type == R_386_GNU_VTENTRY) 2083 { 2084 if (wrel != rel) 2085 *wrel = *rel; 2086 continue; 2087 } 2088 2089 howto = elf_i386_rtype_to_howto (r_type); 2090 if (howto == NULL) 2091 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type); 2092 2093 r_symndx = ELF32_R_SYM (rel->r_info); 2094 h = NULL; 2095 sym = NULL; 2096 sec = NULL; 2097 unresolved_reloc = false; 2098 if (r_symndx < symtab_hdr->sh_info) 2099 { 2100 sym = local_syms + r_symndx; 2101 sec = local_sections[r_symndx]; 2102 relocation = (sec->output_section->vma 2103 + sec->output_offset 2104 + sym->st_value); 2105 st_size = sym->st_size; 2106 2107 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION 2108 && ((sec->flags & SEC_MERGE) != 0 2109 || (bfd_link_relocatable (info) 2110 && sec->output_offset != 0))) 2111 { 2112 bfd_vma addend; 2113 bfd_byte *where = contents + rel->r_offset; 2114 2115 switch (bfd_get_reloc_size (howto)) 2116 { 2117 case 1: 2118 addend = bfd_get_8 (input_bfd, where); 2119 if (howto->pc_relative) 2120 { 2121 addend = (addend ^ 0x80) - 0x80; 2122 addend += 1; 2123 } 2124 break; 2125 case 2: 2126 addend = bfd_get_16 (input_bfd, where); 2127 if (howto->pc_relative) 2128 { 2129 addend = (addend ^ 0x8000) - 0x8000; 2130 addend += 2; 2131 } 2132 break; 2133 case 4: 2134 addend = bfd_get_32 (input_bfd, where); 2135 if (howto->pc_relative) 2136 { 2137 addend = (addend ^ 0x80000000) - 0x80000000; 2138 addend += 4; 2139 } 2140 break; 2141 default: 2142 abort (); 2143 } 2144 2145 if (bfd_link_relocatable (info)) 2146 addend += sec->output_offset; 2147 else 2148 { 2149 asection *msec = sec; 2150 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, 2151 addend); 2152 addend -= relocation; 2153 addend += msec->output_section->vma + msec->output_offset; 2154 } 2155 2156 switch (bfd_get_reloc_size (howto)) 2157 { 2158 case 1: 2159 /* FIXME: overflow checks. */ 2160 if (howto->pc_relative) 2161 addend -= 1; 2162 bfd_put_8 (input_bfd, addend, where); 2163 break; 2164 case 2: 2165 if (howto->pc_relative) 2166 addend -= 2; 2167 bfd_put_16 (input_bfd, addend, where); 2168 break; 2169 case 4: 2170 if (howto->pc_relative) 2171 addend -= 4; 2172 bfd_put_32 (input_bfd, addend, where); 2173 break; 2174 } 2175 } 2176 else if (!bfd_link_relocatable (info) 2177 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 2178 { 2179 /* Relocate against local STT_GNU_IFUNC symbol. */ 2180 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel, 2181 false); 2182 if (h == NULL) 2183 abort (); 2184 2185 /* Set STT_GNU_IFUNC symbol value. */ 2186 h->root.u.def.value = sym->st_value; 2187 h->root.u.def.section = sec; 2188 } 2189 } 2190 else 2191 { 2192 bool warned ATTRIBUTE_UNUSED; 2193 bool ignored ATTRIBUTE_UNUSED; 2194 2195 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2196 r_symndx, symtab_hdr, sym_hashes, 2197 h, sec, relocation, 2198 unresolved_reloc, warned, ignored); 2199 st_size = h->size; 2200 } 2201 2202 if (sec != NULL && discarded_section (sec)) 2203 { 2204 _bfd_clear_contents (howto, input_bfd, input_section, 2205 contents, rel->r_offset); 2206 wrel->r_offset = rel->r_offset; 2207 wrel->r_info = 0; 2208 wrel->r_addend = 0; 2209 2210 /* For ld -r, remove relocations in debug sections against 2211 sections defined in discarded sections. Not done for 2212 eh_frame editing code expects to be present. */ 2213 if (bfd_link_relocatable (info) 2214 && (input_section->flags & SEC_DEBUGGING)) 2215 wrel--; 2216 2217 continue; 2218 } 2219 2220 if (bfd_link_relocatable (info)) 2221 { 2222 if (wrel != rel) 2223 *wrel = *rel; 2224 continue; 2225 } 2226 2227 eh = (struct elf_x86_link_hash_entry *) h; 2228 2229 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle 2230 it here if it is defined in a non-shared object. */ 2231 if (h != NULL 2232 && h->type == STT_GNU_IFUNC 2233 && h->def_regular) 2234 { 2235 asection *gotplt, *base_got; 2236 bfd_vma plt_index; 2237 const char *name; 2238 2239 if ((input_section->flags & SEC_ALLOC) == 0) 2240 { 2241 /* If this is a SHT_NOTE section without SHF_ALLOC, treat 2242 STT_GNU_IFUNC symbol as STT_FUNC. */ 2243 if (elf_section_type (input_section) == SHT_NOTE) 2244 goto skip_ifunc; 2245 /* Dynamic relocs are not propagated for SEC_DEBUGGING 2246 sections because such sections are not SEC_ALLOC and 2247 thus ld.so will not process them. */ 2248 if ((input_section->flags & SEC_DEBUGGING) != 0) 2249 continue; 2250 abort (); 2251 } 2252 2253 /* STT_GNU_IFUNC symbol must go through PLT. */ 2254 if (htab->elf.splt != NULL) 2255 { 2256 if (htab->plt_second != NULL) 2257 { 2258 resolved_plt = htab->plt_second; 2259 plt_offset = eh->plt_second.offset; 2260 } 2261 else 2262 { 2263 resolved_plt = htab->elf.splt; 2264 plt_offset = h->plt.offset; 2265 } 2266 gotplt = htab->elf.sgotplt; 2267 } 2268 else 2269 { 2270 resolved_plt = htab->elf.iplt; 2271 plt_offset = h->plt.offset; 2272 gotplt = htab->elf.igotplt; 2273 } 2274 2275 switch (r_type) 2276 { 2277 default: 2278 break; 2279 2280 case R_386_GOT32: 2281 case R_386_GOT32X: 2282 base_got = htab->elf.sgot; 2283 off = h->got.offset; 2284 2285 if (base_got == NULL) 2286 abort (); 2287 2288 if (off == (bfd_vma) -1) 2289 { 2290 /* We can't use h->got.offset here to save state, or 2291 even just remember the offset, as finish_dynamic_symbol 2292 would use that as offset into .got. */ 2293 2294 if (h->plt.offset == (bfd_vma) -1) 2295 abort (); 2296 2297 if (htab->elf.splt != NULL) 2298 { 2299 plt_index = (h->plt.offset / plt_entry_size 2300 - htab->plt.has_plt0); 2301 off = (plt_index + 3) * 4; 2302 base_got = htab->elf.sgotplt; 2303 } 2304 else 2305 { 2306 plt_index = h->plt.offset / plt_entry_size; 2307 off = plt_index * 4; 2308 base_got = htab->elf.igotplt; 2309 } 2310 2311 if (h->dynindx == -1 2312 || h->forced_local 2313 || info->symbolic) 2314 { 2315 /* This references the local defitionion. We must 2316 initialize this entry in the global offset table. 2317 Since the offset must always be a multiple of 4, 2318 we use the least significant bit to record 2319 whether we have initialized it already. 2320 2321 When doing a dynamic link, we create a .rela.got 2322 relocation entry to initialize the value. This 2323 is done in the finish_dynamic_symbol routine. */ 2324 if ((off & 1) != 0) 2325 off &= ~1; 2326 else 2327 { 2328 bfd_put_32 (output_bfd, relocation, 2329 base_got->contents + off); 2330 h->got.offset |= 1; 2331 } 2332 } 2333 2334 relocation = off; 2335 } 2336 else 2337 relocation = (base_got->output_section->vma 2338 + base_got->output_offset + off 2339 - gotplt->output_section->vma 2340 - gotplt->output_offset); 2341 2342 if (rel->r_offset > 1 2343 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5 2344 && *(contents + rel->r_offset - 2) != 0x8d) 2345 { 2346 if (bfd_link_pic (info)) 2347 goto disallow_got32; 2348 2349 /* Add the GOT base if there is no base register. */ 2350 relocation += (gotplt->output_section->vma 2351 + gotplt->output_offset); 2352 } 2353 else if (htab->elf.splt == NULL) 2354 { 2355 /* Adjust for static executables. */ 2356 relocation += gotplt->output_offset; 2357 } 2358 2359 goto do_relocation; 2360 } 2361 2362 if (h->plt.offset == (bfd_vma) -1) 2363 { 2364 /* Handle static pointers of STT_GNU_IFUNC symbols. */ 2365 if (r_type == R_386_32 2366 && (input_section->flags & SEC_CODE) == 0) 2367 goto do_ifunc_pointer; 2368 goto bad_ifunc_reloc; 2369 } 2370 2371 relocation = (resolved_plt->output_section->vma 2372 + resolved_plt->output_offset + plt_offset); 2373 2374 switch (r_type) 2375 { 2376 default: 2377 bad_ifunc_reloc: 2378 if (h->root.root.string) 2379 name = h->root.root.string; 2380 else 2381 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, 2382 NULL); 2383 _bfd_error_handler 2384 /* xgettext:c-format */ 2385 (_("%pB: relocation %s against STT_GNU_IFUNC " 2386 "symbol `%s' isn't supported"), input_bfd, 2387 howto->name, name); 2388 bfd_set_error (bfd_error_bad_value); 2389 return false; 2390 2391 case R_386_32: 2392 /* Generate dynamic relcoation only when there is a 2393 non-GOT reference in a shared object. */ 2394 if ((bfd_link_pic (info) && h->non_got_ref) 2395 || h->plt.offset == (bfd_vma) -1) 2396 { 2397 Elf_Internal_Rela outrel; 2398 asection *sreloc; 2399 bfd_vma offset; 2400 2401 do_ifunc_pointer: 2402 /* Need a dynamic relocation to get the real function 2403 adddress. */ 2404 offset = _bfd_elf_section_offset (output_bfd, 2405 info, 2406 input_section, 2407 rel->r_offset); 2408 if (offset == (bfd_vma) -1 2409 || offset == (bfd_vma) -2) 2410 abort (); 2411 2412 outrel.r_offset = (input_section->output_section->vma 2413 + input_section->output_offset 2414 + offset); 2415 2416 if (POINTER_LOCAL_IFUNC_P (info, h)) 2417 { 2418 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 2419 h->root.root.string, 2420 h->root.u.def.section->owner); 2421 2422 /* This symbol is resolved locally. */ 2423 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); 2424 2425 if (htab->params->report_relative_reloc) 2426 _bfd_x86_elf_link_report_relative_reloc 2427 (info, input_section, h, sym, 2428 "R_386_IRELATIVE", &outrel); 2429 2430 bfd_put_32 (output_bfd, 2431 (h->root.u.def.value 2432 + h->root.u.def.section->output_section->vma 2433 + h->root.u.def.section->output_offset), 2434 contents + offset); 2435 } 2436 else 2437 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2438 2439 /* Dynamic relocations are stored in 2440 1. .rel.ifunc section in PIC object. 2441 2. .rel.got section in dynamic executable. 2442 3. .rel.iplt section in static executable. */ 2443 if (bfd_link_pic (info)) 2444 sreloc = htab->elf.irelifunc; 2445 else if (htab->elf.splt != NULL) 2446 sreloc = htab->elf.srelgot; 2447 else 2448 sreloc = htab->elf.irelplt; 2449 elf_append_rel (output_bfd, sreloc, &outrel); 2450 2451 /* If this reloc is against an external symbol, we 2452 do not want to fiddle with the addend. Otherwise, 2453 we need to include the symbol value so that it 2454 becomes an addend for the dynamic reloc. For an 2455 internal symbol, we have updated addend. */ 2456 continue; 2457 } 2458 /* FALLTHROUGH */ 2459 case R_386_PC32: 2460 case R_386_PLT32: 2461 goto do_relocation; 2462 2463 case R_386_GOTOFF: 2464 /* NB: We can't use the PLT entry as the function address 2465 for PIC since the PIC register may not be set up 2466 properly for indirect call. */ 2467 if (bfd_link_pic (info)) 2468 goto bad_ifunc_reloc; 2469 relocation -= (gotplt->output_section->vma 2470 + gotplt->output_offset); 2471 goto do_relocation; 2472 } 2473 } 2474 2475 skip_ifunc: 2476 resolved_to_zero = (eh != NULL 2477 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh)); 2478 2479 switch (r_type) 2480 { 2481 case R_386_GOT32X: 2482 case R_386_GOT32: 2483 /* Relocation is to the entry for this symbol in the global 2484 offset table. */ 2485 if (htab->elf.sgot == NULL) 2486 abort (); 2487 2488 relative_reloc = false; 2489 if (h != NULL) 2490 { 2491 off = h->got.offset; 2492 if (RESOLVED_LOCALLY_P (info, h, htab)) 2493 { 2494 /* We must initialize this entry in the global offset 2495 table. Since the offset must always be a multiple 2496 of 4, we use the least significant bit to record 2497 whether we have initialized it already. 2498 2499 When doing a dynamic link, we create a .rel.got 2500 relocation entry to initialize the value. This 2501 is done in the finish_dynamic_symbol routine. */ 2502 if ((off & 1) != 0) 2503 off &= ~1; 2504 else 2505 { 2506 bfd_put_32 (output_bfd, relocation, 2507 htab->elf.sgot->contents + off); 2508 h->got.offset |= 1; 2509 /* NB: Don't generate relative relocation here if 2510 it has been generated by DT_RELR. */ 2511 if (!info->enable_dt_relr 2512 && GENERATE_RELATIVE_RELOC_P (info, h)) 2513 { 2514 /* PR ld/21402: If this symbol isn't dynamic 2515 in PIC, generate R_386_RELATIVE here. */ 2516 eh->no_finish_dynamic_symbol = 1; 2517 relative_reloc = true; 2518 } 2519 } 2520 } 2521 else 2522 unresolved_reloc = false; 2523 } 2524 else 2525 { 2526 if (local_got_offsets == NULL) 2527 abort (); 2528 2529 off = local_got_offsets[r_symndx]; 2530 2531 /* The offset must always be a multiple of 4. We use 2532 the least significant bit to record whether we have 2533 already generated the necessary reloc. */ 2534 if ((off & 1) != 0) 2535 off &= ~1; 2536 else 2537 { 2538 bfd_put_32 (output_bfd, relocation, 2539 htab->elf.sgot->contents + off); 2540 local_got_offsets[r_symndx] |= 1; 2541 2542 /* NB: Don't generate relative relocation here if it 2543 has been generated by DT_RELR. */ 2544 if (!info->enable_dt_relr && bfd_link_pic (info)) 2545 relative_reloc = true; 2546 } 2547 } 2548 2549 if (relative_reloc) 2550 { 2551 asection *s; 2552 Elf_Internal_Rela outrel; 2553 2554 s = htab->elf.srelgot; 2555 if (s == NULL) 2556 abort (); 2557 2558 outrel.r_offset = (htab->elf.sgot->output_section->vma 2559 + htab->elf.sgot->output_offset 2560 + off); 2561 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2562 2563 if (htab->params->report_relative_reloc) 2564 _bfd_x86_elf_link_report_relative_reloc 2565 (info, input_section, h, sym, "R_386_RELATIVE", 2566 &outrel); 2567 2568 elf_append_rel (output_bfd, s, &outrel); 2569 } 2570 2571 if (off >= (bfd_vma) -2) 2572 abort (); 2573 2574 relocation = (htab->elf.sgot->output_section->vma 2575 + htab->elf.sgot->output_offset + off); 2576 if (rel->r_offset > 1 2577 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5 2578 && *(contents + rel->r_offset - 2) != 0x8d) 2579 { 2580 if (bfd_link_pic (info)) 2581 { 2582 /* For PIC, disallow R_386_GOT32 without a base 2583 register, except for "lea foo@GOT, %reg", since 2584 we don't know what the GOT base is. */ 2585 const char *name; 2586 2587 disallow_got32: 2588 if (h == NULL || h->root.root.string == NULL) 2589 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, 2590 NULL); 2591 else 2592 name = h->root.root.string; 2593 2594 _bfd_error_handler 2595 /* xgettext:c-format */ 2596 (_("%pB: direct GOT relocation %s against `%s'" 2597 " without base register can not be used" 2598 " when making a shared object"), 2599 input_bfd, howto->name, name); 2600 bfd_set_error (bfd_error_bad_value); 2601 return false; 2602 } 2603 } 2604 else 2605 { 2606 /* Subtract the .got.plt section address only with a base 2607 register. */ 2608 relocation -= (htab->elf.sgotplt->output_section->vma 2609 + htab->elf.sgotplt->output_offset); 2610 } 2611 2612 break; 2613 2614 case R_386_GOTOFF: 2615 /* Relocation is relative to the start of the global offset 2616 table. */ 2617 2618 /* Check to make sure it isn't a protected function or data 2619 symbol for shared library since it may not be local when 2620 used as function address or with copy relocation. We also 2621 need to make sure that a symbol is referenced locally. */ 2622 if (!bfd_link_executable (info) && h) 2623 { 2624 if (!h->def_regular) 2625 { 2626 const char *v; 2627 2628 switch (ELF_ST_VISIBILITY (h->other)) 2629 { 2630 case STV_HIDDEN: 2631 v = _("hidden symbol"); 2632 break; 2633 case STV_INTERNAL: 2634 v = _("internal symbol"); 2635 break; 2636 case STV_PROTECTED: 2637 v = _("protected symbol"); 2638 break; 2639 default: 2640 v = _("symbol"); 2641 break; 2642 } 2643 2644 _bfd_error_handler 2645 /* xgettext:c-format */ 2646 (_("%pB: relocation R_386_GOTOFF against undefined %s" 2647 " `%s' can not be used when making a shared object"), 2648 input_bfd, v, h->root.root.string); 2649 bfd_set_error (bfd_error_bad_value); 2650 return false; 2651 } 2652 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h) 2653 && (h->type == STT_FUNC 2654 || h->type == STT_OBJECT) 2655 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) 2656 { 2657 _bfd_error_handler 2658 /* xgettext:c-format */ 2659 (_("%pB: relocation R_386_GOTOFF against protected %s" 2660 " `%s' can not be used when making a shared object"), 2661 input_bfd, 2662 h->type == STT_FUNC ? "function" : "data", 2663 h->root.root.string); 2664 bfd_set_error (bfd_error_bad_value); 2665 return false; 2666 } 2667 } 2668 2669 /* Note that sgot is not involved in this 2670 calculation. We always want the start of .got.plt. If we 2671 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is 2672 permitted by the ABI, we might have to change this 2673 calculation. */ 2674 relocation -= htab->elf.sgotplt->output_section->vma 2675 + htab->elf.sgotplt->output_offset; 2676 break; 2677 2678 case R_386_GOTPC: 2679 /* Use global offset table as symbol value. */ 2680 relocation = htab->elf.sgotplt->output_section->vma 2681 + htab->elf.sgotplt->output_offset; 2682 unresolved_reloc = false; 2683 break; 2684 2685 case R_386_PLT32: 2686 /* Relocation is to the entry for this symbol in the 2687 procedure linkage table. */ 2688 2689 /* Resolve a PLT32 reloc against a local symbol directly, 2690 without using the procedure linkage table. */ 2691 if (h == NULL) 2692 break; 2693 2694 if ((h->plt.offset == (bfd_vma) -1 2695 && eh->plt_got.offset == (bfd_vma) -1) 2696 || htab->elf.splt == NULL) 2697 { 2698 /* We didn't make a PLT entry for this symbol. This 2699 happens when statically linking PIC code, or when 2700 using -Bsymbolic. */ 2701 break; 2702 } 2703 2704 if (h->plt.offset != (bfd_vma) -1) 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->plt_got; 2720 plt_offset = eh->plt_got.offset; 2721 } 2722 2723 relocation = (resolved_plt->output_section->vma 2724 + resolved_plt->output_offset 2725 + plt_offset); 2726 unresolved_reloc = false; 2727 break; 2728 2729 case R_386_SIZE32: 2730 /* Set to symbol size. */ 2731 relocation = st_size; 2732 /* Fall through. */ 2733 2734 case R_386_32: 2735 case R_386_PC32: 2736 if ((input_section->flags & SEC_ALLOC) == 0 2737 || is_vxworks_tls) 2738 break; 2739 2740 if (GENERATE_DYNAMIC_RELOCATION_P (false, info, eh, r_type, 2741 sec, false, 2742 resolved_to_zero, 2743 (r_type == R_386_PC32))) 2744 { 2745 Elf_Internal_Rela outrel; 2746 bool skip, relocate; 2747 bool generate_dynamic_reloc = true; 2748 asection *sreloc; 2749 2750 /* When generating a shared object, these relocations 2751 are copied into the output file to be resolved at run 2752 time. */ 2753 2754 skip = false; 2755 relocate = false; 2756 2757 outrel.r_offset = 2758 _bfd_elf_section_offset (output_bfd, info, input_section, 2759 rel->r_offset); 2760 if (outrel.r_offset == (bfd_vma) -1) 2761 skip = true; 2762 else if (outrel.r_offset == (bfd_vma) -2) 2763 skip = true, relocate = true; 2764 outrel.r_offset += (input_section->output_section->vma 2765 + input_section->output_offset); 2766 2767 if (skip) 2768 memset (&outrel, 0, sizeof outrel); 2769 else if (COPY_INPUT_RELOC_P (false, info, h, r_type)) 2770 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2771 else 2772 { 2773 /* This symbol is local, or marked to become local. */ 2774 relocate = true; 2775 /* NB: Don't generate relative relocation here if it 2776 has been generated by DT_RELR. */ 2777 if (info->enable_dt_relr) 2778 generate_dynamic_reloc = false; 2779 else 2780 { 2781 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2782 2783 if (htab->params->report_relative_reloc) 2784 _bfd_x86_elf_link_report_relative_reloc 2785 (info, input_section, h, sym, "R_386_RELATIVE", 2786 &outrel); 2787 } 2788 } 2789 2790 if (generate_dynamic_reloc) 2791 { 2792 sreloc = elf_section_data (input_section)->sreloc; 2793 2794 if (sreloc == NULL || sreloc->contents == NULL) 2795 { 2796 r = bfd_reloc_notsupported; 2797 goto check_relocation_error; 2798 } 2799 2800 elf_append_rel (output_bfd, sreloc, &outrel); 2801 } 2802 2803 /* If this reloc is against an external symbol, we do 2804 not want to fiddle with the addend. Otherwise, we 2805 need to include the symbol value so that it becomes 2806 an addend for the dynamic reloc. */ 2807 if (! relocate) 2808 continue; 2809 } 2810 break; 2811 2812 case R_386_TLS_IE: 2813 if (!bfd_link_executable (info)) 2814 { 2815 Elf_Internal_Rela outrel; 2816 asection *sreloc; 2817 2818 outrel.r_offset = rel->r_offset 2819 + input_section->output_section->vma 2820 + input_section->output_offset; 2821 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2822 2823 if (htab->params->report_relative_reloc) 2824 _bfd_x86_elf_link_report_relative_reloc 2825 (info, input_section, h, sym, "R_386_RELATIVE", 2826 &outrel); 2827 2828 sreloc = elf_section_data (input_section)->sreloc; 2829 if (sreloc == NULL) 2830 abort (); 2831 elf_append_rel (output_bfd, sreloc, &outrel); 2832 } 2833 /* Fall through */ 2834 2835 case R_386_TLS_GD: 2836 case R_386_TLS_GOTDESC: 2837 case R_386_TLS_DESC_CALL: 2838 case R_386_TLS_IE_32: 2839 case R_386_TLS_GOTIE: 2840 tls_type = GOT_UNKNOWN; 2841 if (h == NULL && local_got_offsets) 2842 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx]; 2843 else if (h != NULL) 2844 tls_type = elf_x86_hash_entry(h)->tls_type; 2845 if (tls_type == GOT_TLS_IE) 2846 tls_type = GOT_TLS_IE_NEG; 2847 2848 r_type_tls = r_type; 2849 if (! elf_i386_tls_transition (info, input_bfd, 2850 input_section, contents, 2851 symtab_hdr, sym_hashes, 2852 &r_type_tls, tls_type, rel, 2853 relend, h, r_symndx, true)) 2854 return false; 2855 2856 if (r_type_tls == R_386_TLS_LE_32) 2857 { 2858 BFD_ASSERT (! unresolved_reloc); 2859 if (r_type == R_386_TLS_GD) 2860 { 2861 unsigned int type; 2862 bfd_vma roff; 2863 2864 /* GD->LE transition. */ 2865 type = *(contents + rel->r_offset - 2); 2866 if (type == 0x04) 2867 { 2868 /* Change 2869 leal foo@tlsgd(,%ebx,1), %eax 2870 call ___tls_get_addr@PLT 2871 into: 2872 movl %gs:0, %eax 2873 subl $foo@tpoff, %eax 2874 (6 byte form of subl). */ 2875 roff = rel->r_offset + 5; 2876 } 2877 else 2878 { 2879 /* Change 2880 leal foo@tlsgd(%ebx), %eax 2881 call ___tls_get_addr@PLT 2882 nop 2883 or 2884 leal foo@tlsgd(%reg), %eax 2885 call *___tls_get_addr@GOT(%reg) 2886 which may be converted to 2887 addr32 call ___tls_get_addr 2888 into: 2889 movl %gs:0, %eax; subl $foo@tpoff, %eax 2890 (6 byte form of subl). */ 2891 roff = rel->r_offset + 6; 2892 } 2893 memcpy (contents + roff - 8, 2894 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); 2895 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), 2896 contents + roff); 2897 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */ 2898 rel++; 2899 wrel++; 2900 continue; 2901 } 2902 else if (r_type == R_386_TLS_GOTDESC) 2903 { 2904 /* GDesc -> LE transition. 2905 It's originally something like: 2906 leal x@tlsdesc(%ebx), %eax 2907 2908 leal x@ntpoff, %eax 2909 2910 Registers other than %eax may be set up here. */ 2911 2912 unsigned int val; 2913 bfd_vma roff; 2914 2915 roff = rel->r_offset; 2916 val = bfd_get_8 (input_bfd, contents + roff - 1); 2917 2918 /* Now modify the instruction as appropriate. */ 2919 /* aoliva FIXME: remove the above and xor the byte 2920 below with 0x86. */ 2921 bfd_put_8 (output_bfd, val ^ 0x86, 2922 contents + roff - 1); 2923 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 2924 contents + roff); 2925 continue; 2926 } 2927 else if (r_type == R_386_TLS_DESC_CALL) 2928 { 2929 /* GDesc -> LE transition. 2930 It's originally: 2931 call *(%eax) 2932 Turn it into: 2933 xchg %ax,%ax */ 2934 2935 bfd_vma roff; 2936 2937 roff = rel->r_offset; 2938 bfd_put_8 (output_bfd, 0x66, contents + roff); 2939 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 2940 continue; 2941 } 2942 else if (r_type == R_386_TLS_IE) 2943 { 2944 unsigned int val; 2945 2946 /* IE->LE transition: 2947 Originally it can be one of: 2948 movl foo, %eax 2949 movl foo, %reg 2950 addl foo, %reg 2951 We change it into: 2952 movl $foo, %eax 2953 movl $foo, %reg 2954 addl $foo, %reg. */ 2955 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2956 if (val == 0xa1) 2957 { 2958 /* movl foo, %eax. */ 2959 bfd_put_8 (output_bfd, 0xb8, 2960 contents + rel->r_offset - 1); 2961 } 2962 else 2963 { 2964 unsigned int type; 2965 2966 type = bfd_get_8 (input_bfd, 2967 contents + rel->r_offset - 2); 2968 switch (type) 2969 { 2970 case 0x8b: 2971 /* movl */ 2972 bfd_put_8 (output_bfd, 0xc7, 2973 contents + rel->r_offset - 2); 2974 bfd_put_8 (output_bfd, 2975 0xc0 | ((val >> 3) & 7), 2976 contents + rel->r_offset - 1); 2977 break; 2978 case 0x03: 2979 /* addl */ 2980 bfd_put_8 (output_bfd, 0x81, 2981 contents + rel->r_offset - 2); 2982 bfd_put_8 (output_bfd, 2983 0xc0 | ((val >> 3) & 7), 2984 contents + rel->r_offset - 1); 2985 break; 2986 default: 2987 BFD_FAIL (); 2988 break; 2989 } 2990 } 2991 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 2992 contents + rel->r_offset); 2993 continue; 2994 } 2995 else 2996 { 2997 unsigned int val, type; 2998 2999 /* {IE_32,GOTIE}->LE transition: 3000 Originally it can be one of: 3001 subl foo(%reg1), %reg2 3002 movl foo(%reg1), %reg2 3003 addl foo(%reg1), %reg2 3004 We change it into: 3005 subl $foo, %reg2 3006 movl $foo, %reg2 (6 byte form) 3007 addl $foo, %reg2. */ 3008 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 3009 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 3010 if (type == 0x8b) 3011 { 3012 /* movl */ 3013 bfd_put_8 (output_bfd, 0xc7, 3014 contents + rel->r_offset - 2); 3015 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 3016 contents + rel->r_offset - 1); 3017 } 3018 else if (type == 0x2b) 3019 { 3020 /* subl */ 3021 bfd_put_8 (output_bfd, 0x81, 3022 contents + rel->r_offset - 2); 3023 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), 3024 contents + rel->r_offset - 1); 3025 } 3026 else if (type == 0x03) 3027 { 3028 /* addl */ 3029 bfd_put_8 (output_bfd, 0x81, 3030 contents + rel->r_offset - 2); 3031 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 3032 contents + rel->r_offset - 1); 3033 } 3034 else 3035 BFD_FAIL (); 3036 if (r_type == R_386_TLS_GOTIE) 3037 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 3038 contents + rel->r_offset); 3039 else 3040 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), 3041 contents + rel->r_offset); 3042 continue; 3043 } 3044 } 3045 3046 if (htab->elf.sgot == NULL) 3047 abort (); 3048 3049 if (h != NULL) 3050 { 3051 off = h->got.offset; 3052 offplt = elf_x86_hash_entry (h)->tlsdesc_got; 3053 } 3054 else 3055 { 3056 if (local_got_offsets == NULL) 3057 abort (); 3058 3059 off = local_got_offsets[r_symndx]; 3060 offplt = local_tlsdesc_gotents[r_symndx]; 3061 } 3062 3063 if ((off & 1) != 0) 3064 off &= ~1; 3065 else 3066 { 3067 Elf_Internal_Rela outrel; 3068 int dr_type; 3069 asection *sreloc; 3070 3071 if (htab->elf.srelgot == NULL) 3072 abort (); 3073 3074 indx = h && h->dynindx != -1 ? h->dynindx : 0; 3075 3076 if (GOT_TLS_GDESC_P (tls_type)) 3077 { 3078 bfd_byte *loc; 3079 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC); 3080 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8 3081 <= htab->elf.sgotplt->size); 3082 outrel.r_offset = (htab->elf.sgotplt->output_section->vma 3083 + htab->elf.sgotplt->output_offset 3084 + offplt 3085 + htab->sgotplt_jump_table_size); 3086 sreloc = htab->elf.srelplt; 3087 loc = sreloc->contents; 3088 loc += (htab->next_tls_desc_index++ 3089 * sizeof (Elf32_External_Rel)); 3090 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 3091 <= sreloc->contents + sreloc->size); 3092 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3093 if (indx == 0) 3094 { 3095 BFD_ASSERT (! unresolved_reloc); 3096 bfd_put_32 (output_bfd, 3097 relocation - _bfd_x86_elf_dtpoff_base (info), 3098 htab->elf.sgotplt->contents + offplt 3099 + htab->sgotplt_jump_table_size + 4); 3100 } 3101 else 3102 { 3103 bfd_put_32 (output_bfd, 0, 3104 htab->elf.sgotplt->contents + offplt 3105 + htab->sgotplt_jump_table_size + 4); 3106 } 3107 } 3108 3109 sreloc = htab->elf.srelgot; 3110 3111 outrel.r_offset = (htab->elf.sgot->output_section->vma 3112 + htab->elf.sgot->output_offset + off); 3113 3114 if (GOT_TLS_GD_P (tls_type)) 3115 dr_type = R_386_TLS_DTPMOD32; 3116 else if (GOT_TLS_GDESC_P (tls_type)) 3117 goto dr_done; 3118 else if (tls_type == GOT_TLS_IE_POS) 3119 dr_type = R_386_TLS_TPOFF; 3120 else 3121 dr_type = R_386_TLS_TPOFF32; 3122 3123 if (dr_type == R_386_TLS_TPOFF && indx == 0) 3124 bfd_put_32 (output_bfd, 3125 relocation - _bfd_x86_elf_dtpoff_base (info), 3126 htab->elf.sgot->contents + off); 3127 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) 3128 bfd_put_32 (output_bfd, 3129 _bfd_x86_elf_dtpoff_base (info) - relocation, 3130 htab->elf.sgot->contents + off); 3131 else if (dr_type != R_386_TLS_DESC) 3132 bfd_put_32 (output_bfd, 0, 3133 htab->elf.sgot->contents + off); 3134 outrel.r_info = ELF32_R_INFO (indx, dr_type); 3135 3136 elf_append_rel (output_bfd, sreloc, &outrel); 3137 3138 if (GOT_TLS_GD_P (tls_type)) 3139 { 3140 if (indx == 0) 3141 { 3142 BFD_ASSERT (! unresolved_reloc); 3143 bfd_put_32 (output_bfd, 3144 relocation - _bfd_x86_elf_dtpoff_base (info), 3145 htab->elf.sgot->contents + off + 4); 3146 } 3147 else 3148 { 3149 bfd_put_32 (output_bfd, 0, 3150 htab->elf.sgot->contents + off + 4); 3151 outrel.r_info = ELF32_R_INFO (indx, 3152 R_386_TLS_DTPOFF32); 3153 outrel.r_offset += 4; 3154 elf_append_rel (output_bfd, sreloc, &outrel); 3155 } 3156 } 3157 else if (tls_type == GOT_TLS_IE_BOTH) 3158 { 3159 bfd_put_32 (output_bfd, 3160 (indx == 0 3161 ? relocation - _bfd_x86_elf_dtpoff_base (info) 3162 : 0), 3163 htab->elf.sgot->contents + off + 4); 3164 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 3165 outrel.r_offset += 4; 3166 elf_append_rel (output_bfd, sreloc, &outrel); 3167 } 3168 3169 dr_done: 3170 if (h != NULL) 3171 h->got.offset |= 1; 3172 else 3173 local_got_offsets[r_symndx] |= 1; 3174 } 3175 3176 if (off >= (bfd_vma) -2 3177 && ! GOT_TLS_GDESC_P (tls_type)) 3178 abort (); 3179 if (r_type_tls == R_386_TLS_GOTDESC 3180 || r_type_tls == R_386_TLS_DESC_CALL) 3181 { 3182 relocation = htab->sgotplt_jump_table_size + offplt; 3183 unresolved_reloc = false; 3184 } 3185 else if (r_type_tls == r_type) 3186 { 3187 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma 3188 + htab->elf.sgotplt->output_offset; 3189 relocation = htab->elf.sgot->output_section->vma 3190 + htab->elf.sgot->output_offset + off - g_o_t; 3191 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) 3192 && tls_type == GOT_TLS_IE_BOTH) 3193 relocation += 4; 3194 if (r_type == R_386_TLS_IE) 3195 relocation += g_o_t; 3196 unresolved_reloc = false; 3197 } 3198 else if (r_type == R_386_TLS_GD) 3199 { 3200 unsigned int val, type; 3201 bfd_vma roff; 3202 3203 /* GD->IE transition. */ 3204 type = *(contents + rel->r_offset - 2); 3205 val = *(contents + rel->r_offset - 1); 3206 if (type == 0x04) 3207 { 3208 /* Change 3209 leal foo@tlsgd(,%ebx,1), %eax 3210 call ___tls_get_addr@PLT 3211 into: 3212 movl %gs:0, %eax 3213 subl $foo@gottpoff(%ebx), %eax. */ 3214 val >>= 3; 3215 roff = rel->r_offset - 3; 3216 } 3217 else 3218 { 3219 /* Change 3220 leal foo@tlsgd(%ebx), %eax 3221 call ___tls_get_addr@PLT 3222 nop 3223 or 3224 leal foo@tlsgd(%reg), %eax 3225 call *___tls_get_addr@GOT(%reg) 3226 which may be converted to 3227 addr32 call ___tls_get_addr 3228 into: 3229 movl %gs:0, %eax; 3230 subl $foo@gottpoff(%reg), %eax. */ 3231 roff = rel->r_offset - 2; 3232 } 3233 memcpy (contents + roff, 3234 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); 3235 contents[roff + 7] = 0x80 | (val & 7); 3236 /* If foo is used only with foo@gotntpoff(%reg) and 3237 foo@indntpoff, but not with foo@gottpoff(%reg), change 3238 subl $foo@gottpoff(%reg), %eax 3239 into: 3240 addl $foo@gotntpoff(%reg), %eax. */ 3241 if (tls_type == GOT_TLS_IE_POS) 3242 contents[roff + 6] = 0x03; 3243 bfd_put_32 (output_bfd, 3244 htab->elf.sgot->output_section->vma 3245 + htab->elf.sgot->output_offset + off 3246 - htab->elf.sgotplt->output_section->vma 3247 - htab->elf.sgotplt->output_offset, 3248 contents + roff + 8); 3249 /* Skip R_386_PLT32 and R_386_GOT32X. */ 3250 rel++; 3251 wrel++; 3252 continue; 3253 } 3254 else if (r_type == R_386_TLS_GOTDESC) 3255 { 3256 /* GDesc -> IE transition. 3257 It's originally something like: 3258 leal x@tlsdesc(%ebx), %eax 3259 3260 Change it to: 3261 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax 3262 or: 3263 movl x@gottpoff(%ebx), %eax # before negl %eax 3264 3265 Registers other than %eax may be set up here. */ 3266 3267 bfd_vma roff; 3268 3269 /* First, make sure it's a leal adding ebx to a 32-bit 3270 offset into any register, although it's probably 3271 almost always going to be eax. */ 3272 roff = rel->r_offset; 3273 3274 /* Now modify the instruction as appropriate. */ 3275 /* To turn a leal into a movl in the form we use it, it 3276 suffices to change the first byte from 0x8d to 0x8b. 3277 aoliva FIXME: should we decide to keep the leal, all 3278 we have to do is remove the statement below, and 3279 adjust the relaxation of R_386_TLS_DESC_CALL. */ 3280 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); 3281 3282 if (tls_type == GOT_TLS_IE_BOTH) 3283 off += 4; 3284 3285 bfd_put_32 (output_bfd, 3286 htab->elf.sgot->output_section->vma 3287 + htab->elf.sgot->output_offset + off 3288 - htab->elf.sgotplt->output_section->vma 3289 - htab->elf.sgotplt->output_offset, 3290 contents + roff); 3291 continue; 3292 } 3293 else if (r_type == R_386_TLS_DESC_CALL) 3294 { 3295 /* GDesc -> IE transition. 3296 It's originally: 3297 call *(%eax) 3298 3299 Change it to: 3300 xchg %ax,%ax 3301 or 3302 negl %eax 3303 depending on how we transformed the TLS_GOTDESC above. 3304 */ 3305 3306 bfd_vma roff; 3307 3308 roff = rel->r_offset; 3309 3310 /* Now modify the instruction as appropriate. */ 3311 if (tls_type != GOT_TLS_IE_NEG) 3312 { 3313 /* xchg %ax,%ax */ 3314 bfd_put_8 (output_bfd, 0x66, contents + roff); 3315 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 3316 } 3317 else 3318 { 3319 /* negl %eax */ 3320 bfd_put_8 (output_bfd, 0xf7, contents + roff); 3321 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1); 3322 } 3323 3324 continue; 3325 } 3326 else 3327 BFD_ASSERT (false); 3328 break; 3329 3330 case R_386_TLS_LDM: 3331 if (! elf_i386_tls_transition (info, input_bfd, 3332 input_section, contents, 3333 symtab_hdr, sym_hashes, 3334 &r_type, GOT_UNKNOWN, rel, 3335 relend, h, r_symndx, true)) 3336 return false; 3337 3338 if (r_type != R_386_TLS_LDM) 3339 { 3340 /* LD->LE transition. Change 3341 leal foo@tlsldm(%ebx) %eax 3342 call ___tls_get_addr@PLT 3343 into: 3344 movl %gs:0, %eax 3345 nop 3346 leal 0(%esi,1), %esi 3347 or change 3348 leal foo@tlsldm(%reg) %eax 3349 call *___tls_get_addr@GOT(%reg) 3350 which may be converted to 3351 addr32 call ___tls_get_addr 3352 into: 3353 movl %gs:0, %eax 3354 leal 0(%esi), %esi */ 3355 BFD_ASSERT (r_type == R_386_TLS_LE_32); 3356 if (*(contents + rel->r_offset + 4) == 0xff 3357 || *(contents + rel->r_offset + 4) == 0x67) 3358 memcpy (contents + rel->r_offset - 2, 3359 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12); 3360 else 3361 memcpy (contents + rel->r_offset - 2, 3362 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); 3363 /* Skip R_386_PC32/R_386_PLT32. */ 3364 rel++; 3365 wrel++; 3366 continue; 3367 } 3368 3369 if (htab->elf.sgot == NULL) 3370 abort (); 3371 3372 off = htab->tls_ld_or_ldm_got.offset; 3373 if (off & 1) 3374 off &= ~1; 3375 else 3376 { 3377 Elf_Internal_Rela outrel; 3378 3379 if (htab->elf.srelgot == NULL) 3380 abort (); 3381 3382 outrel.r_offset = (htab->elf.sgot->output_section->vma 3383 + htab->elf.sgot->output_offset + off); 3384 3385 bfd_put_32 (output_bfd, 0, 3386 htab->elf.sgot->contents + off); 3387 bfd_put_32 (output_bfd, 0, 3388 htab->elf.sgot->contents + off + 4); 3389 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); 3390 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel); 3391 htab->tls_ld_or_ldm_got.offset |= 1; 3392 } 3393 relocation = htab->elf.sgot->output_section->vma 3394 + htab->elf.sgot->output_offset + off 3395 - htab->elf.sgotplt->output_section->vma 3396 - htab->elf.sgotplt->output_offset; 3397 unresolved_reloc = false; 3398 break; 3399 3400 case R_386_TLS_LDO_32: 3401 if (!bfd_link_executable (info) 3402 || (input_section->flags & SEC_CODE) == 0) 3403 relocation -= _bfd_x86_elf_dtpoff_base (info); 3404 else 3405 /* When converting LDO to LE, we must negate. */ 3406 relocation = -elf_i386_tpoff (info, relocation); 3407 break; 3408 3409 case R_386_TLS_LE_32: 3410 case R_386_TLS_LE: 3411 if (!bfd_link_executable (info)) 3412 { 3413 Elf_Internal_Rela outrel; 3414 asection *sreloc; 3415 3416 outrel.r_offset = rel->r_offset 3417 + input_section->output_section->vma 3418 + input_section->output_offset; 3419 if (h != NULL && h->dynindx != -1) 3420 indx = h->dynindx; 3421 else 3422 indx = 0; 3423 if (r_type == R_386_TLS_LE_32) 3424 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); 3425 else 3426 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 3427 sreloc = elf_section_data (input_section)->sreloc; 3428 if (sreloc == NULL) 3429 abort (); 3430 elf_append_rel (output_bfd, sreloc, &outrel); 3431 if (indx) 3432 continue; 3433 else if (r_type == R_386_TLS_LE_32) 3434 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation; 3435 else 3436 relocation -= _bfd_x86_elf_dtpoff_base (info); 3437 } 3438 else if (r_type == R_386_TLS_LE_32) 3439 relocation = elf_i386_tpoff (info, relocation); 3440 else 3441 relocation = -elf_i386_tpoff (info, relocation); 3442 break; 3443 3444 default: 3445 break; 3446 } 3447 3448 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3449 because such sections are not SEC_ALLOC and thus ld.so will 3450 not process them. */ 3451 if (unresolved_reloc 3452 && !((input_section->flags & SEC_DEBUGGING) != 0 3453 && h->def_dynamic) 3454 && _bfd_elf_section_offset (output_bfd, info, input_section, 3455 rel->r_offset) != (bfd_vma) -1) 3456 { 3457 _bfd_error_handler 3458 /* xgettext:c-format */ 3459 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"), 3460 input_bfd, 3461 input_section, 3462 (uint64_t) rel->r_offset, 3463 howto->name, 3464 h->root.root.string); 3465 return false; 3466 } 3467 3468 do_relocation: 3469 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3470 contents, rel->r_offset, 3471 relocation, 0); 3472 3473 check_relocation_error: 3474 if (r != bfd_reloc_ok) 3475 { 3476 const char *name; 3477 3478 if (h != NULL) 3479 name = h->root.root.string; 3480 else 3481 { 3482 name = bfd_elf_string_from_elf_section (input_bfd, 3483 symtab_hdr->sh_link, 3484 sym->st_name); 3485 if (name == NULL) 3486 return false; 3487 if (*name == '\0') 3488 name = bfd_section_name (sec); 3489 } 3490 3491 if (r == bfd_reloc_overflow) 3492 (*info->callbacks->reloc_overflow) 3493 (info, (h ? &h->root : NULL), name, howto->name, 3494 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 3495 else 3496 { 3497 _bfd_error_handler 3498 /* xgettext:c-format */ 3499 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"), 3500 input_bfd, input_section, 3501 (uint64_t) rel->r_offset, name, (int) r); 3502 return false; 3503 } 3504 } 3505 3506 if (wrel != rel) 3507 *wrel = *rel; 3508 } 3509 3510 if (wrel != rel) 3511 { 3512 Elf_Internal_Shdr *rel_hdr; 3513 size_t deleted = rel - wrel; 3514 3515 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); 3516 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; 3517 if (rel_hdr->sh_size == 0) 3518 { 3519 /* It is too late to remove an empty reloc section. Leave 3520 one NONE reloc. 3521 ??? What is wrong with an empty section??? */ 3522 rel_hdr->sh_size = rel_hdr->sh_entsize; 3523 deleted -= 1; 3524 } 3525 rel_hdr = _bfd_elf_single_rel_hdr (input_section); 3526 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; 3527 input_section->reloc_count -= deleted; 3528 } 3529 3530 return true; 3531 } 3532 3533 /* Finish up dynamic symbol handling. We set the contents of various 3534 dynamic sections here. */ 3535 3536 static bool 3537 elf_i386_finish_dynamic_symbol (bfd *output_bfd, 3538 struct bfd_link_info *info, 3539 struct elf_link_hash_entry *h, 3540 Elf_Internal_Sym *sym) 3541 { 3542 struct elf_x86_link_hash_table *htab; 3543 unsigned plt_entry_size; 3544 struct elf_x86_link_hash_entry *eh; 3545 bool local_undefweak; 3546 bool use_plt_second; 3547 3548 htab = elf_x86_hash_table (info, I386_ELF_DATA); 3549 if (htab == NULL) 3550 return false; 3551 3552 plt_entry_size = htab->plt.plt_entry_size; 3553 3554 /* Use the second PLT section only if there is .plt section. */ 3555 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL; 3556 3557 eh = (struct elf_x86_link_hash_entry *) h; 3558 if (eh->no_finish_dynamic_symbol) 3559 abort (); 3560 3561 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for 3562 resolved undefined weak symbols in executable so that their 3563 references have value 0 at run-time. */ 3564 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); 3565 3566 if (h->plt.offset != (bfd_vma) -1) 3567 { 3568 bfd_vma plt_index, plt_offset; 3569 bfd_vma got_offset; 3570 Elf_Internal_Rela rel; 3571 bfd_byte *loc; 3572 asection *plt, *resolved_plt, *gotplt, *relplt; 3573 3574 /* When building a static executable, use .iplt, .igot.plt and 3575 .rel.iplt sections for STT_GNU_IFUNC symbols. */ 3576 if (htab->elf.splt != NULL) 3577 { 3578 plt = htab->elf.splt; 3579 gotplt = htab->elf.sgotplt; 3580 relplt = htab->elf.srelplt; 3581 } 3582 else 3583 { 3584 plt = htab->elf.iplt; 3585 gotplt = htab->elf.igotplt; 3586 relplt = htab->elf.irelplt; 3587 } 3588 3589 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak) 3590 3591 /* Get the index in the procedure linkage table which 3592 corresponds to this symbol. This is the index of this symbol 3593 in all the symbols for which we are making plt entries. The 3594 first entry in the procedure linkage table is reserved. 3595 3596 Get the offset into the .got table of the entry that 3597 corresponds to this function. Each .got entry is 4 bytes. 3598 The first three are reserved. 3599 3600 For static executables, we don't reserve anything. */ 3601 3602 if (plt == htab->elf.splt) 3603 { 3604 got_offset = (h->plt.offset / plt_entry_size 3605 - htab->plt.has_plt0); 3606 got_offset = (got_offset + 3) * 4; 3607 } 3608 else 3609 { 3610 got_offset = h->plt.offset / plt_entry_size; 3611 got_offset = got_offset * 4; 3612 } 3613 3614 /* Fill in the entry in the procedure linkage table and update 3615 the first slot. */ 3616 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry, 3617 plt_entry_size); 3618 3619 if (use_plt_second) 3620 { 3621 const bfd_byte *plt_entry; 3622 if (bfd_link_pic (info)) 3623 plt_entry = htab->non_lazy_plt->pic_plt_entry; 3624 else 3625 plt_entry = htab->non_lazy_plt->plt_entry; 3626 memcpy (htab->plt_second->contents + eh->plt_second.offset, 3627 plt_entry, htab->non_lazy_plt->plt_entry_size); 3628 3629 resolved_plt = htab->plt_second; 3630 plt_offset = eh->plt_second.offset; 3631 } 3632 else 3633 { 3634 resolved_plt = plt; 3635 plt_offset = h->plt.offset; 3636 } 3637 3638 if (! bfd_link_pic (info)) 3639 { 3640 bfd_put_32 (output_bfd, 3641 (gotplt->output_section->vma 3642 + gotplt->output_offset 3643 + got_offset), 3644 resolved_plt->contents + plt_offset 3645 + htab->plt.plt_got_offset); 3646 3647 if (htab->elf.target_os == is_vxworks) 3648 { 3649 int s, k, reloc_index; 3650 3651 /* Create the R_386_32 relocation referencing the GOT 3652 for this PLT entry. */ 3653 3654 /* S: Current slot number (zero-based). */ 3655 s = ((h->plt.offset - htab->plt.plt_entry_size) 3656 / htab->plt.plt_entry_size); 3657 /* K: Number of relocations for PLTResolve. */ 3658 if (bfd_link_pic (info)) 3659 k = PLTRESOLVE_RELOCS_SHLIB; 3660 else 3661 k = PLTRESOLVE_RELOCS; 3662 /* Skip the PLTresolve relocations, and the relocations for 3663 the other PLT slots. */ 3664 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS; 3665 loc = (htab->srelplt2->contents + reloc_index 3666 * sizeof (Elf32_External_Rel)); 3667 3668 rel.r_offset = (plt->output_section->vma 3669 + plt->output_offset 3670 + h->plt.offset + 2), 3671 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 3672 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3673 3674 /* Create the R_386_32 relocation referencing the beginning of 3675 the PLT for this GOT entry. */ 3676 rel.r_offset = (htab->elf.sgotplt->output_section->vma 3677 + htab->elf.sgotplt->output_offset 3678 + got_offset); 3679 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); 3680 bfd_elf32_swap_reloc_out (output_bfd, &rel, 3681 loc + sizeof (Elf32_External_Rel)); 3682 } 3683 } 3684 else 3685 { 3686 bfd_put_32 (output_bfd, got_offset, 3687 resolved_plt->contents + plt_offset 3688 + htab->plt.plt_got_offset); 3689 } 3690 3691 /* Fill in the entry in the global offset table. Leave the entry 3692 as zero for undefined weak symbol in PIE. No PLT relocation 3693 against undefined weak symbol in PIE. */ 3694 if (!local_undefweak) 3695 { 3696 if (htab->plt.has_plt0) 3697 bfd_put_32 (output_bfd, 3698 (plt->output_section->vma 3699 + plt->output_offset 3700 + h->plt.offset 3701 + htab->lazy_plt->plt_lazy_offset), 3702 gotplt->contents + got_offset); 3703 3704 /* Fill in the entry in the .rel.plt section. */ 3705 rel.r_offset = (gotplt->output_section->vma 3706 + gotplt->output_offset 3707 + got_offset); 3708 if (PLT_LOCAL_IFUNC_P (info, h)) 3709 { 3710 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 3711 h->root.root.string, 3712 h->root.u.def.section->owner); 3713 3714 /* If an STT_GNU_IFUNC symbol is locally defined, generate 3715 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend 3716 in the .got.plt section. */ 3717 bfd_put_32 (output_bfd, 3718 (h->root.u.def.value 3719 + h->root.u.def.section->output_section->vma 3720 + h->root.u.def.section->output_offset), 3721 gotplt->contents + got_offset); 3722 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); 3723 3724 if (htab->params->report_relative_reloc) 3725 _bfd_x86_elf_link_report_relative_reloc 3726 (info, relplt, h, sym, "R_386_IRELATIVE", &rel); 3727 3728 /* R_386_IRELATIVE comes last. */ 3729 plt_index = htab->next_irelative_index--; 3730 } 3731 else 3732 { 3733 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); 3734 plt_index = htab->next_jump_slot_index++; 3735 } 3736 3737 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel); 3738 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3739 3740 /* Don't fill the second and third slots in PLT entry for 3741 static executables nor without PLT0. */ 3742 if (plt == htab->elf.splt && htab->plt.has_plt0) 3743 { 3744 bfd_put_32 (output_bfd, 3745 plt_index * sizeof (Elf32_External_Rel), 3746 plt->contents + h->plt.offset 3747 + htab->lazy_plt->plt_reloc_offset); 3748 bfd_put_32 (output_bfd, 3749 - (h->plt.offset 3750 + htab->lazy_plt->plt_plt_offset + 4), 3751 (plt->contents + h->plt.offset 3752 + htab->lazy_plt->plt_plt_offset)); 3753 } 3754 } 3755 } 3756 else if (eh->plt_got.offset != (bfd_vma) -1) 3757 { 3758 bfd_vma got_offset, plt_offset; 3759 asection *plt, *got, *gotplt; 3760 const bfd_byte *got_plt_entry; 3761 3762 /* Set the entry in the GOT procedure linkage table. */ 3763 plt = htab->plt_got; 3764 got = htab->elf.sgot; 3765 gotplt = htab->elf.sgotplt; 3766 got_offset = h->got.offset; 3767 3768 if (got_offset == (bfd_vma) -1 3769 || plt == NULL 3770 || got == NULL 3771 || gotplt == NULL) 3772 abort (); 3773 3774 /* Fill in the entry in the GOT procedure linkage table. */ 3775 if (! bfd_link_pic (info)) 3776 { 3777 got_plt_entry = htab->non_lazy_plt->plt_entry; 3778 got_offset += got->output_section->vma + got->output_offset; 3779 } 3780 else 3781 { 3782 got_plt_entry = htab->non_lazy_plt->pic_plt_entry; 3783 got_offset += (got->output_section->vma 3784 + got->output_offset 3785 - gotplt->output_section->vma 3786 - gotplt->output_offset); 3787 } 3788 3789 plt_offset = eh->plt_got.offset; 3790 memcpy (plt->contents + plt_offset, got_plt_entry, 3791 htab->non_lazy_plt->plt_entry_size); 3792 bfd_put_32 (output_bfd, got_offset, 3793 (plt->contents + plt_offset 3794 + htab->non_lazy_plt->plt_got_offset)); 3795 } 3796 3797 if (!local_undefweak 3798 && !h->def_regular 3799 && (h->plt.offset != (bfd_vma) -1 3800 || eh->plt_got.offset != (bfd_vma) -1)) 3801 { 3802 /* Mark the symbol as undefined, rather than as defined in 3803 the .plt section. Leave the value if there were any 3804 relocations where pointer equality matters (this is a clue 3805 for the dynamic linker, to make function pointer 3806 comparisons work between an application and shared 3807 library), otherwise set it to zero. If a function is only 3808 called from a binary, there is no need to slow down 3809 shared libraries because of that. */ 3810 sym->st_shndx = SHN_UNDEF; 3811 if (!h->pointer_equality_needed) 3812 sym->st_value = 0; 3813 } 3814 3815 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym); 3816 3817 /* Don't generate dynamic GOT relocation against undefined weak 3818 symbol in executable. */ 3819 if (h->got.offset != (bfd_vma) -1 3820 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type) 3821 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0 3822 && !local_undefweak) 3823 { 3824 Elf_Internal_Rela rel; 3825 asection *relgot = htab->elf.srelgot; 3826 const char *relative_reloc_name = NULL; 3827 bool generate_dynamic_reloc = true; 3828 3829 /* This symbol has an entry in the global offset table. Set it 3830 up. */ 3831 3832 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 3833 abort (); 3834 3835 rel.r_offset = (htab->elf.sgot->output_section->vma 3836 + htab->elf.sgot->output_offset 3837 + (h->got.offset & ~(bfd_vma) 1)); 3838 3839 /* If this is a static link, or it is a -Bsymbolic link and the 3840 symbol is defined locally or was forced to be local because 3841 of a version file, we just want to emit a RELATIVE reloc. 3842 The entry in the global offset table will already have been 3843 initialized in the relocate_section function. */ 3844 if (h->def_regular 3845 && h->type == STT_GNU_IFUNC) 3846 { 3847 if (h->plt.offset == (bfd_vma) -1) 3848 { 3849 /* STT_GNU_IFUNC is referenced without PLT. */ 3850 if (htab->elf.splt == NULL) 3851 { 3852 /* use .rel[a].iplt section to store .got relocations 3853 in static executable. */ 3854 relgot = htab->elf.irelplt; 3855 } 3856 if (SYMBOL_REFERENCES_LOCAL_P (info, h)) 3857 { 3858 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 3859 h->root.root.string, 3860 h->root.u.def.section->owner); 3861 3862 bfd_put_32 (output_bfd, 3863 (h->root.u.def.value 3864 + h->root.u.def.section->output_section->vma 3865 + h->root.u.def.section->output_offset), 3866 htab->elf.sgot->contents + h->got.offset); 3867 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); 3868 relative_reloc_name = "R_386_IRELATIVE"; 3869 } 3870 else 3871 goto do_glob_dat; 3872 } 3873 else if (bfd_link_pic (info)) 3874 { 3875 /* Generate R_386_GLOB_DAT. */ 3876 goto do_glob_dat; 3877 } 3878 else 3879 { 3880 asection *plt; 3881 bfd_vma plt_offset; 3882 3883 if (!h->pointer_equality_needed) 3884 abort (); 3885 3886 /* For non-shared object, we can't use .got.plt, which 3887 contains the real function addres if we need pointer 3888 equality. We load the GOT entry with the PLT entry. */ 3889 if (htab->plt_second != NULL) 3890 { 3891 plt = htab->plt_second; 3892 plt_offset = eh->plt_second.offset; 3893 } 3894 else 3895 { 3896 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; 3897 plt_offset = h->plt.offset; 3898 } 3899 bfd_put_32 (output_bfd, 3900 (plt->output_section->vma 3901 + plt->output_offset + plt_offset), 3902 htab->elf.sgot->contents + h->got.offset); 3903 return true; 3904 } 3905 } 3906 else if (bfd_link_pic (info) 3907 && SYMBOL_REFERENCES_LOCAL_P (info, h)) 3908 { 3909 BFD_ASSERT((h->got.offset & 1) != 0); 3910 if (info->enable_dt_relr) 3911 generate_dynamic_reloc = false; 3912 else 3913 { 3914 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 3915 relative_reloc_name = "R_386_RELATIVE"; 3916 } 3917 } 3918 else 3919 { 3920 BFD_ASSERT((h->got.offset & 1) == 0); 3921 do_glob_dat: 3922 bfd_put_32 (output_bfd, (bfd_vma) 0, 3923 htab->elf.sgot->contents + h->got.offset); 3924 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); 3925 } 3926 3927 if (generate_dynamic_reloc) 3928 { 3929 if (relative_reloc_name != NULL 3930 && htab->params->report_relative_reloc) 3931 _bfd_x86_elf_link_report_relative_reloc 3932 (info, relgot, h, sym, relative_reloc_name, &rel); 3933 3934 elf_append_rel (output_bfd, relgot, &rel); 3935 } 3936 } 3937 3938 if (h->needs_copy) 3939 { 3940 Elf_Internal_Rela rel; 3941 asection *s; 3942 3943 /* This symbol needs a copy reloc. Set it up. */ 3944 VERIFY_COPY_RELOC (h, htab) 3945 3946 rel.r_offset = (h->root.u.def.value 3947 + h->root.u.def.section->output_section->vma 3948 + h->root.u.def.section->output_offset); 3949 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); 3950 if (h->root.u.def.section == htab->elf.sdynrelro) 3951 s = htab->elf.sreldynrelro; 3952 else 3953 s = htab->elf.srelbss; 3954 elf_append_rel (output_bfd, s, &rel); 3955 } 3956 3957 return true; 3958 } 3959 3960 /* Finish up local dynamic symbol handling. We set the contents of 3961 various dynamic sections here. */ 3962 3963 static int 3964 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf) 3965 { 3966 struct elf_link_hash_entry *h 3967 = (struct elf_link_hash_entry *) *slot; 3968 struct bfd_link_info *info 3969 = (struct bfd_link_info *) inf; 3970 3971 return elf_i386_finish_dynamic_symbol (info->output_bfd, info, 3972 h, NULL); 3973 } 3974 3975 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry 3976 here since undefined weak symbol may not be dynamic and may not be 3977 called for elf_i386_finish_dynamic_symbol. */ 3978 3979 static bool 3980 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh, 3981 void *inf) 3982 { 3983 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh; 3984 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3985 3986 if (h->root.type != bfd_link_hash_undefweak 3987 || h->dynindx != -1) 3988 return true; 3989 3990 return elf_i386_finish_dynamic_symbol (info->output_bfd, 3991 info, h, NULL); 3992 } 3993 3994 /* Used to decide how to sort relocs in an optimal manner for the 3995 dynamic linker, before writing them out. */ 3996 3997 static enum elf_reloc_type_class 3998 elf_i386_reloc_type_class (const struct bfd_link_info *info, 3999 const asection *rel_sec ATTRIBUTE_UNUSED, 4000 const Elf_Internal_Rela *rela) 4001 { 4002 bfd *abfd = info->output_bfd; 4003 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 4004 struct elf_link_hash_table *htab = elf_hash_table (info); 4005 4006 if (htab->dynsym != NULL 4007 && htab->dynsym->contents != NULL) 4008 { 4009 /* Check relocation against STT_GNU_IFUNC symbol if there are 4010 dynamic symbols. */ 4011 unsigned long r_symndx = ELF32_R_SYM (rela->r_info); 4012 if (r_symndx != STN_UNDEF) 4013 { 4014 Elf_Internal_Sym sym; 4015 if (!bed->s->swap_symbol_in (abfd, 4016 (htab->dynsym->contents 4017 + r_symndx * sizeof (Elf32_External_Sym)), 4018 0, &sym)) 4019 abort (); 4020 4021 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) 4022 return reloc_class_ifunc; 4023 } 4024 } 4025 4026 switch (ELF32_R_TYPE (rela->r_info)) 4027 { 4028 case R_386_IRELATIVE: 4029 return reloc_class_ifunc; 4030 case R_386_RELATIVE: 4031 return reloc_class_relative; 4032 case R_386_JUMP_SLOT: 4033 return reloc_class_plt; 4034 case R_386_COPY: 4035 return reloc_class_copy; 4036 default: 4037 return reloc_class_normal; 4038 } 4039 } 4040 4041 /* Finish up the dynamic sections. */ 4042 4043 static bool 4044 elf_i386_finish_dynamic_sections (bfd *output_bfd, 4045 struct bfd_link_info *info) 4046 { 4047 struct elf_x86_link_hash_table *htab; 4048 4049 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info); 4050 if (htab == NULL) 4051 return false; 4052 4053 if (!htab->elf.dynamic_sections_created) 4054 return true; 4055 4056 if (htab->elf.splt && htab->elf.splt->size > 0) 4057 { 4058 if (bfd_is_abs_section (htab->elf.splt->output_section)) 4059 { 4060 info->callbacks->einfo 4061 (_("%F%P: discarded output section: `%pA'\n"), 4062 htab->elf.splt); 4063 return false; 4064 } 4065 4066 /* UnixWare sets the entsize of .plt to 4, although that doesn't 4067 really seem like the right value. */ 4068 elf_section_data (htab->elf.splt->output_section) 4069 ->this_hdr.sh_entsize = 4; 4070 4071 if (htab->plt.has_plt0) 4072 { 4073 /* Fill in the special first entry in the procedure linkage 4074 table. */ 4075 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry, 4076 htab->lazy_plt->plt0_entry_size); 4077 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size, 4078 htab->plt0_pad_byte, 4079 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size); 4080 if (!bfd_link_pic (info)) 4081 { 4082 bfd_put_32 (output_bfd, 4083 (htab->elf.sgotplt->output_section->vma 4084 + htab->elf.sgotplt->output_offset 4085 + 4), 4086 htab->elf.splt->contents 4087 + htab->lazy_plt->plt0_got1_offset); 4088 bfd_put_32 (output_bfd, 4089 (htab->elf.sgotplt->output_section->vma 4090 + htab->elf.sgotplt->output_offset 4091 + 8), 4092 htab->elf.splt->contents 4093 + htab->lazy_plt->plt0_got2_offset); 4094 4095 if (htab->elf.target_os == is_vxworks) 4096 { 4097 Elf_Internal_Rela rel; 4098 int num_plts = (htab->elf.splt->size 4099 / htab->plt.plt_entry_size) - 1; 4100 unsigned char *p; 4101 asection *srelplt2 = htab->srelplt2; 4102 4103 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ 4104 + 4. On IA32 we use REL relocations so the 4105 addend goes in the PLT directly. */ 4106 rel.r_offset = (htab->elf.splt->output_section->vma 4107 + htab->elf.splt->output_offset 4108 + htab->lazy_plt->plt0_got1_offset); 4109 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, 4110 R_386_32); 4111 bfd_elf32_swap_reloc_out (output_bfd, &rel, 4112 srelplt2->contents); 4113 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ 4114 + 8. */ 4115 rel.r_offset = (htab->elf.splt->output_section->vma 4116 + htab->elf.splt->output_offset 4117 + htab->lazy_plt->plt0_got2_offset); 4118 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, 4119 R_386_32); 4120 bfd_elf32_swap_reloc_out (output_bfd, &rel, 4121 srelplt2->contents + 4122 sizeof (Elf32_External_Rel)); 4123 /* Correct the .rel.plt.unloaded relocations. */ 4124 p = srelplt2->contents; 4125 if (bfd_link_pic (info)) 4126 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel); 4127 else 4128 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel); 4129 4130 for (; num_plts; num_plts--) 4131 { 4132 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 4133 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, 4134 R_386_32); 4135 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 4136 p += sizeof (Elf32_External_Rel); 4137 4138 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 4139 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, 4140 R_386_32); 4141 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 4142 p += sizeof (Elf32_External_Rel); 4143 } 4144 } 4145 } 4146 } 4147 } 4148 4149 /* Fill PLT entries for undefined weak symbols in PIE. */ 4150 if (bfd_link_pie (info)) 4151 bfd_hash_traverse (&info->hash->table, 4152 elf_i386_pie_finish_undefweak_symbol, 4153 info); 4154 4155 return true; 4156 } 4157 4158 /* Fill PLT/GOT entries and allocate dynamic relocations for local 4159 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table. 4160 It has to be done before elf_link_sort_relocs is called so that 4161 dynamic relocations are properly sorted. */ 4162 4163 static bool 4164 elf_i386_output_arch_local_syms 4165 (bfd *output_bfd ATTRIBUTE_UNUSED, 4166 struct bfd_link_info *info, 4167 void *flaginfo ATTRIBUTE_UNUSED, 4168 int (*func) (void *, const char *, 4169 Elf_Internal_Sym *, 4170 asection *, 4171 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED) 4172 { 4173 struct elf_x86_link_hash_table *htab 4174 = elf_x86_hash_table (info, I386_ELF_DATA); 4175 if (htab == NULL) 4176 return false; 4177 4178 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ 4179 htab_traverse (htab->loc_hash_table, 4180 elf_i386_finish_local_dynamic_symbol, 4181 info); 4182 4183 return true; 4184 } 4185 4186 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all 4187 dynamic relocations. */ 4188 4189 static long 4190 elf_i386_get_synthetic_symtab (bfd *abfd, 4191 long symcount ATTRIBUTE_UNUSED, 4192 asymbol **syms ATTRIBUTE_UNUSED, 4193 long dynsymcount, 4194 asymbol **dynsyms, 4195 asymbol **ret) 4196 { 4197 long count, i, n; 4198 int j; 4199 bfd_byte *plt_contents; 4200 long relsize; 4201 const struct elf_x86_lazy_plt_layout *lazy_plt; 4202 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; 4203 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt; 4204 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt; 4205 asection *plt; 4206 bfd_vma got_addr; 4207 enum elf_x86_plt_type plt_type; 4208 struct elf_x86_plt plts[] = 4209 { 4210 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 }, 4211 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }, 4212 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 }, 4213 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 } 4214 }; 4215 4216 *ret = NULL; 4217 4218 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0) 4219 return 0; 4220 4221 if (dynsymcount <= 0) 4222 return 0; 4223 4224 relsize = bfd_get_dynamic_reloc_upper_bound (abfd); 4225 if (relsize <= 0) 4226 return -1; 4227 4228 non_lazy_plt = NULL; 4229 /* Silence GCC 6. */ 4230 lazy_plt = NULL; 4231 non_lazy_ibt_plt = NULL; 4232 lazy_ibt_plt = NULL; 4233 switch (get_elf_backend_data (abfd)->target_os) 4234 { 4235 case is_normal: 4236 case is_solaris: 4237 non_lazy_plt = &elf_i386_non_lazy_plt; 4238 lazy_ibt_plt = &elf_i386_lazy_ibt_plt; 4239 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt; 4240 /* Fall through */ 4241 case is_vxworks: 4242 lazy_plt = &elf_i386_lazy_plt; 4243 break; 4244 default: 4245 abort (); 4246 } 4247 4248 got_addr = 0; 4249 4250 count = 0; 4251 for (j = 0; plts[j].name != NULL; j++) 4252 { 4253 plt = bfd_get_section_by_name (abfd, plts[j].name); 4254 if (plt == NULL || plt->size == 0) 4255 continue; 4256 4257 /* Get the PLT section contents. */ 4258 plt_contents = (bfd_byte *) bfd_malloc (plt->size); 4259 if (plt_contents == NULL) 4260 break; 4261 if (!bfd_get_section_contents (abfd, (asection *) plt, 4262 plt_contents, 0, plt->size)) 4263 { 4264 free (plt_contents); 4265 break; 4266 } 4267 4268 /* Check what kind of PLT it is. */ 4269 plt_type = plt_unknown; 4270 if (plts[j].type == plt_unknown 4271 && (plt->size >= (lazy_plt->plt0_entry_size 4272 + lazy_plt->plt_entry_size))) 4273 { 4274 /* Match lazy PLT first. */ 4275 if (memcmp (plt_contents, lazy_plt->plt0_entry, 4276 lazy_plt->plt0_got1_offset) == 0) 4277 { 4278 /* The fist entry in the lazy IBT PLT is the same as the 4279 normal lazy PLT. */ 4280 if (lazy_ibt_plt != NULL 4281 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size, 4282 lazy_ibt_plt->plt_entry, 4283 lazy_ibt_plt->plt_got_offset) == 0)) 4284 plt_type = plt_lazy | plt_second; 4285 else 4286 plt_type = plt_lazy; 4287 } 4288 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry, 4289 lazy_plt->plt0_got1_offset) == 0) 4290 { 4291 /* The fist entry in the PIC lazy IBT PLT is the same as 4292 the normal PIC lazy PLT. */ 4293 if (lazy_ibt_plt != NULL 4294 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size, 4295 lazy_ibt_plt->pic_plt_entry, 4296 lazy_ibt_plt->plt_got_offset) == 0)) 4297 plt_type = plt_lazy | plt_pic | plt_second; 4298 else 4299 plt_type = plt_lazy | plt_pic; 4300 } 4301 } 4302 4303 if (non_lazy_plt != NULL 4304 && (plt_type == plt_unknown || plt_type == plt_non_lazy) 4305 && plt->size >= non_lazy_plt->plt_entry_size) 4306 { 4307 /* Match non-lazy PLT. */ 4308 if (memcmp (plt_contents, non_lazy_plt->plt_entry, 4309 non_lazy_plt->plt_got_offset) == 0) 4310 plt_type = plt_non_lazy; 4311 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry, 4312 non_lazy_plt->plt_got_offset) == 0) 4313 plt_type = plt_pic; 4314 } 4315 4316 if ((non_lazy_ibt_plt != NULL) 4317 && (plt_type == plt_unknown || plt_type == plt_second) 4318 && plt->size >= non_lazy_ibt_plt->plt_entry_size) 4319 { 4320 if (memcmp (plt_contents, 4321 non_lazy_ibt_plt->plt_entry, 4322 non_lazy_ibt_plt->plt_got_offset) == 0) 4323 { 4324 /* Match IBT PLT. */ 4325 plt_type = plt_second; 4326 non_lazy_plt = non_lazy_ibt_plt; 4327 } 4328 else if (memcmp (plt_contents, 4329 non_lazy_ibt_plt->pic_plt_entry, 4330 non_lazy_ibt_plt->plt_got_offset) == 0) 4331 { 4332 /* Match PIC IBT PLT. */ 4333 plt_type = plt_second | plt_pic; 4334 non_lazy_plt = non_lazy_ibt_plt; 4335 } 4336 } 4337 4338 if (plt_type == plt_unknown) 4339 { 4340 free (plt_contents); 4341 continue; 4342 } 4343 4344 plts[j].sec = plt; 4345 plts[j].type = plt_type; 4346 4347 if ((plt_type & plt_lazy)) 4348 { 4349 plts[j].plt_got_offset = lazy_plt->plt_got_offset; 4350 plts[j].plt_entry_size = lazy_plt->plt_entry_size; 4351 /* Skip PLT0 in lazy PLT. */ 4352 i = 1; 4353 } 4354 else 4355 { 4356 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset; 4357 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size; 4358 i = 0; 4359 } 4360 4361 /* Skip lazy PLT when the second PLT is used. */ 4362 if ((plt_type & (plt_lazy | plt_second)) 4363 == (plt_lazy | plt_second)) 4364 plts[j].count = 0; 4365 else 4366 { 4367 n = plt->size / plts[j].plt_entry_size; 4368 plts[j].count = n; 4369 count += n - i; 4370 } 4371 4372 plts[j].contents = plt_contents; 4373 4374 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */ 4375 if ((plt_type & plt_pic)) 4376 got_addr = (bfd_vma) -1; 4377 } 4378 4379 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize, 4380 got_addr, plts, dynsyms, 4381 ret); 4382 } 4383 4384 /* Set up i386 GNU properties. Return the first relocatable ELF input 4385 with GNU properties if found. Otherwise, return NULL. */ 4386 4387 static bfd * 4388 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info) 4389 { 4390 struct elf_x86_init_table init_table; 4391 4392 switch (get_elf_backend_data (info->output_bfd)->target_os) 4393 { 4394 case is_normal: 4395 case is_solaris: 4396 init_table.plt0_pad_byte = 0x0; 4397 init_table.lazy_plt = &elf_i386_lazy_plt; 4398 init_table.non_lazy_plt = &elf_i386_non_lazy_plt; 4399 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt; 4400 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt; 4401 break; 4402 case is_vxworks: 4403 init_table.plt0_pad_byte = 0x90; 4404 init_table.lazy_plt = &elf_i386_lazy_plt; 4405 init_table.non_lazy_plt = NULL; 4406 init_table.lazy_ibt_plt = NULL; 4407 init_table.non_lazy_ibt_plt = NULL; 4408 break; 4409 default: 4410 abort (); 4411 } 4412 4413 init_table.r_info = elf32_r_info; 4414 init_table.r_sym = elf32_r_sym; 4415 4416 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table); 4417 } 4418 4419 #define TARGET_LITTLE_SYM i386_elf32_vec 4420 #define TARGET_LITTLE_NAME "elf32-i386" 4421 #define ELF_ARCH bfd_arch_i386 4422 #define ELF_TARGET_ID I386_ELF_DATA 4423 #define ELF_MACHINE_CODE EM_386 4424 #define ELF_MAXPAGESIZE 0x1000 4425 4426 #define elf_backend_can_gc_sections 1 4427 #define elf_backend_can_refcount 1 4428 #define elf_backend_want_got_plt 1 4429 #define elf_backend_plt_readonly 1 4430 #define elf_backend_want_plt_sym 0 4431 #define elf_backend_got_header_size 12 4432 #define elf_backend_plt_alignment 4 4433 #define elf_backend_dtrel_excludes_plt 1 4434 #define elf_backend_caches_rawsize 1 4435 #define elf_backend_want_dynrelro 1 4436 4437 /* Support RELA for objdump of prelink objects. */ 4438 #define elf_info_to_howto elf_i386_info_to_howto_rel 4439 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel 4440 4441 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name 4442 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup 4443 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup 4444 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab 4445 4446 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible 4447 #define elf_backend_always_size_sections elf_i386_always_size_sections 4448 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections 4449 #define elf_backend_fake_sections elf_i386_fake_sections 4450 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections 4451 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol 4452 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms 4453 #define elf_backend_grok_prstatus elf_i386_grok_prstatus 4454 #define elf_backend_grok_psinfo elf_i386_grok_psinfo 4455 #define elf_backend_reloc_type_class elf_i386_reloc_type_class 4456 #define elf_backend_relocate_section elf_i386_relocate_section 4457 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties 4458 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol 4459 4460 #define elf_backend_linux_prpsinfo32_ugid16 true 4461 4462 #define elf32_bed elf32_i386_bed 4463 4464 #include "elf32-target.h" 4465 4466 /* FreeBSD support. */ 4467 4468 #undef TARGET_LITTLE_SYM 4469 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec 4470 #undef TARGET_LITTLE_NAME 4471 #define TARGET_LITTLE_NAME "elf32-i386-freebsd" 4472 #undef ELF_OSABI 4473 #define ELF_OSABI ELFOSABI_FREEBSD 4474 4475 /* The kernel recognizes executables as valid only if they carry a 4476 "FreeBSD" label in the ELF header. So we put this label on all 4477 executables and (for simplicity) also all other object files. */ 4478 4479 static bool 4480 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info) 4481 { 4482 if (!_bfd_elf_init_file_header (abfd, info)) 4483 return false; 4484 4485 #ifdef OLD_FREEBSD_ABI_LABEL 4486 { 4487 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ 4488 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd); 4489 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); 4490 } 4491 #endif 4492 return true; 4493 } 4494 4495 #undef elf_backend_init_file_header 4496 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header 4497 #undef elf32_bed 4498 #define elf32_bed elf32_i386_fbsd_bed 4499 4500 #undef elf_backend_add_symbol_hook 4501 4502 #include "elf32-target.h" 4503 4504 #undef elf_backend_init_file_header 4505 4506 /* Solaris 2. */ 4507 4508 #undef TARGET_LITTLE_SYM 4509 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec 4510 #undef TARGET_LITTLE_NAME 4511 #define TARGET_LITTLE_NAME "elf32-i386-sol2" 4512 4513 #undef ELF_TARGET_OS 4514 #define ELF_TARGET_OS is_solaris 4515 4516 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE 4517 objects won't be recognized. */ 4518 #undef ELF_OSABI 4519 4520 #undef elf32_bed 4521 #define elf32_bed elf32_i386_sol2_bed 4522 4523 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte 4524 boundary. */ 4525 #undef elf_backend_static_tls_alignment 4526 #define elf_backend_static_tls_alignment 8 4527 4528 /* The Solaris 2 ABI requires a plt symbol on all platforms. 4529 4530 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output 4531 File, p.63. */ 4532 #undef elf_backend_want_plt_sym 4533 #define elf_backend_want_plt_sym 1 4534 4535 #undef elf_backend_strtab_flags 4536 #define elf_backend_strtab_flags SHF_STRINGS 4537 4538 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which 4539 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised 4540 FALSE otherwise. ISECTION is the best guess matching section from the 4541 input bfd IBFD, but it might be NULL. */ 4542 4543 static bool 4544 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED, 4545 bfd *obfd ATTRIBUTE_UNUSED, 4546 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED, 4547 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED) 4548 { 4549 /* PR 19938: FIXME: Need to add code for setting the sh_info 4550 and sh_link fields of Solaris specific section types. */ 4551 return false; 4552 4553 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13, 4554 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation: 4555 4556 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc 4557 4558 The following values should be set: 4559 4560 Type Link Info 4561 ----------------------------------------------------------------------------- 4562 SHT_SUNW_ancillary The section header index of 0 4563 [0x6fffffee] the associated string table. 4564 4565 SHT_SUNW_capinfo The section header index of For a dynamic object, the 4566 [0x6ffffff0] the associated symbol table. section header index of 4567 the associated 4568 SHT_SUNW_capchain table, 4569 otherwise 0. 4570 4571 SHT_SUNW_symsort The section header index of 0 4572 [0x6ffffff1] the associated symbol table. 4573 4574 SHT_SUNW_tlssort The section header index of 0 4575 [0x6ffffff2] the associated symbol table. 4576 4577 SHT_SUNW_LDYNSYM The section header index of One greater than the 4578 [0x6ffffff3] the associated string table. symbol table index of the 4579 This index is the same string last local symbol, 4580 table used by the SHT_DYNSYM STB_LOCAL. Since 4581 section. SHT_SUNW_LDYNSYM only 4582 contains local symbols, 4583 sh_info is equivalent to 4584 the number of symbols in 4585 the table. 4586 4587 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer 4588 [0x6ffffff5] the section header index of to named strings, the 4589 the associated section header index of 4590 SHT_SUNW_capinfo table, the associated string 4591 otherwise 0. table, otherwise 0. 4592 4593 SHT_SUNW_move The section header index of 0 4594 [0x6ffffffa] the associated symbol table. 4595 4596 SHT_SUNW_COMDAT 0 0 4597 [0x6ffffffb] 4598 4599 SHT_SUNW_syminfo The section header index of The section header index 4600 [0x6ffffffc] the associated symbol table. of the associated 4601 .dynamic section. 4602 4603 SHT_SUNW_verdef The section header index of The number of version 4604 [0x6ffffffd] the associated string table. definitions within the 4605 section. 4606 4607 SHT_SUNW_verneed The section header index of The number of version 4608 [0x6ffffffe] the associated string table. dependencies within the 4609 section. 4610 4611 SHT_SUNW_versym The section header index of 0 4612 [0x6fffffff] the associated symbol table. */ 4613 } 4614 4615 #undef elf_backend_copy_special_section_fields 4616 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields 4617 4618 #include "elf32-target.h" 4619 4620 /* Intel MCU support. */ 4621 4622 static bool 4623 elf32_iamcu_elf_object_p (bfd *abfd) 4624 { 4625 /* Set the right machine number for an IAMCU elf32 file. */ 4626 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu); 4627 return true; 4628 } 4629 4630 #undef TARGET_LITTLE_SYM 4631 #define TARGET_LITTLE_SYM iamcu_elf32_vec 4632 #undef TARGET_LITTLE_NAME 4633 #define TARGET_LITTLE_NAME "elf32-iamcu" 4634 #undef ELF_ARCH 4635 #define ELF_ARCH bfd_arch_iamcu 4636 4637 #undef ELF_MACHINE_CODE 4638 #define ELF_MACHINE_CODE EM_IAMCU 4639 4640 #undef ELF_TARGET_OS 4641 #undef ELF_OSABI 4642 4643 #undef elf32_bed 4644 #define elf32_bed elf32_iamcu_bed 4645 4646 #undef elf_backend_object_p 4647 #define elf_backend_object_p elf32_iamcu_elf_object_p 4648 4649 #undef elf_backend_static_tls_alignment 4650 4651 #undef elf_backend_want_plt_sym 4652 #define elf_backend_want_plt_sym 0 4653 4654 #undef elf_backend_strtab_flags 4655 #undef elf_backend_copy_special_section_fields 4656 4657 #include "elf32-target.h" 4658 4659 /* Restore defaults. */ 4660 #undef ELF_ARCH 4661 #define ELF_ARCH bfd_arch_i386 4662 #undef ELF_MACHINE_CODE 4663 #define ELF_MACHINE_CODE EM_386 4664 #undef elf_backend_object_p 4665 4666 /* VxWorks support. */ 4667 4668 #undef TARGET_LITTLE_SYM 4669 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec 4670 #undef TARGET_LITTLE_NAME 4671 #define TARGET_LITTLE_NAME "elf32-i386-vxworks" 4672 #undef ELF_OSABI 4673 #undef ELF_MAXPAGESIZE 4674 #define ELF_MAXPAGESIZE 0x1000 4675 #undef elf_backend_plt_alignment 4676 #define elf_backend_plt_alignment 4 4677 4678 #undef ELF_TARGET_OS 4679 #define ELF_TARGET_OS is_vxworks 4680 4681 #undef elf_backend_relocs_compatible 4682 #undef elf_backend_add_symbol_hook 4683 #define elf_backend_add_symbol_hook \ 4684 elf_vxworks_add_symbol_hook 4685 #undef elf_backend_link_output_symbol_hook 4686 #define elf_backend_link_output_symbol_hook \ 4687 elf_vxworks_link_output_symbol_hook 4688 #undef elf_backend_emit_relocs 4689 #define elf_backend_emit_relocs elf_vxworks_emit_relocs 4690 #undef elf_backend_final_write_processing 4691 #define elf_backend_final_write_processing \ 4692 elf_vxworks_final_write_processing 4693 #undef elf_backend_static_tls_alignment 4694 4695 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so 4696 define it. */ 4697 #undef elf_backend_want_plt_sym 4698 #define elf_backend_want_plt_sym 1 4699 4700 #undef elf32_bed 4701 #define elf32_bed elf32_i386_vxworks_bed 4702 4703 #include "elf32-target.h" 4704