1 /* Intel 80386/80486-specific support for 32-bit ELF 2 Copyright (C) 1993-2020 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-nacl.h" 23 #include "elf-vxworks.h" 24 #include "dwarf2.h" 25 #include "opcode/i386.h" 26 27 /* 386 uses REL relocations instead of RELA. */ 28 #define USE_REL 1 29 30 #include "elf/i386.h" 31 32 static reloc_howto_type elf_howto_table[]= 33 { 34 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont, 35 bfd_elf_generic_reloc, "R_386_NONE", 36 TRUE, 0x00000000, 0x00000000, FALSE), 37 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 38 bfd_elf_generic_reloc, "R_386_32", 39 TRUE, 0xffffffff, 0xffffffff, FALSE), 40 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 41 bfd_elf_generic_reloc, "R_386_PC32", 42 TRUE, 0xffffffff, 0xffffffff, TRUE), 43 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 44 bfd_elf_generic_reloc, "R_386_GOT32", 45 TRUE, 0xffffffff, 0xffffffff, FALSE), 46 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 47 bfd_elf_generic_reloc, "R_386_PLT32", 48 TRUE, 0xffffffff, 0xffffffff, TRUE), 49 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 50 bfd_elf_generic_reloc, "R_386_COPY", 51 TRUE, 0xffffffff, 0xffffffff, FALSE), 52 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 53 bfd_elf_generic_reloc, "R_386_GLOB_DAT", 54 TRUE, 0xffffffff, 0xffffffff, FALSE), 55 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 56 bfd_elf_generic_reloc, "R_386_JUMP_SLOT", 57 TRUE, 0xffffffff, 0xffffffff, FALSE), 58 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 59 bfd_elf_generic_reloc, "R_386_RELATIVE", 60 TRUE, 0xffffffff, 0xffffffff, FALSE), 61 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 62 bfd_elf_generic_reloc, "R_386_GOTOFF", 63 TRUE, 0xffffffff, 0xffffffff, FALSE), 64 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 65 bfd_elf_generic_reloc, "R_386_GOTPC", 66 TRUE, 0xffffffff, 0xffffffff, TRUE), 67 68 /* We have a gap in the reloc numbers here. 69 R_386_standard counts the number up to this point, and 70 R_386_ext_offset is the value to subtract from a reloc type of 71 R_386_16 thru R_386_PC8 to form an index into this table. */ 72 #define R_386_standard (R_386_GOTPC + 1) 73 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard) 74 75 /* These relocs are a GNU extension. */ 76 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 77 bfd_elf_generic_reloc, "R_386_TLS_TPOFF", 78 TRUE, 0xffffffff, 0xffffffff, FALSE), 79 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 80 bfd_elf_generic_reloc, "R_386_TLS_IE", 81 TRUE, 0xffffffff, 0xffffffff, FALSE), 82 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 83 bfd_elf_generic_reloc, "R_386_TLS_GOTIE", 84 TRUE, 0xffffffff, 0xffffffff, FALSE), 85 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 86 bfd_elf_generic_reloc, "R_386_TLS_LE", 87 TRUE, 0xffffffff, 0xffffffff, FALSE), 88 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 89 bfd_elf_generic_reloc, "R_386_TLS_GD", 90 TRUE, 0xffffffff, 0xffffffff, FALSE), 91 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 92 bfd_elf_generic_reloc, "R_386_TLS_LDM", 93 TRUE, 0xffffffff, 0xffffffff, FALSE), 94 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 95 bfd_elf_generic_reloc, "R_386_16", 96 TRUE, 0xffff, 0xffff, FALSE), 97 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 98 bfd_elf_generic_reloc, "R_386_PC16", 99 TRUE, 0xffff, 0xffff, TRUE), 100 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 101 bfd_elf_generic_reloc, "R_386_8", 102 TRUE, 0xff, 0xff, FALSE), 103 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, 104 bfd_elf_generic_reloc, "R_386_PC8", 105 TRUE, 0xff, 0xff, TRUE), 106 107 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset) 108 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext) 109 /* These are common with Solaris TLS implementation. */ 110 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 111 bfd_elf_generic_reloc, "R_386_TLS_LDO_32", 112 TRUE, 0xffffffff, 0xffffffff, FALSE), 113 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 114 bfd_elf_generic_reloc, "R_386_TLS_IE_32", 115 TRUE, 0xffffffff, 0xffffffff, FALSE), 116 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 117 bfd_elf_generic_reloc, "R_386_TLS_LE_32", 118 TRUE, 0xffffffff, 0xffffffff, FALSE), 119 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 120 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32", 121 TRUE, 0xffffffff, 0xffffffff, FALSE), 122 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 123 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32", 124 TRUE, 0xffffffff, 0xffffffff, FALSE), 125 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 126 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32", 127 TRUE, 0xffffffff, 0xffffffff, FALSE), 128 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, 129 bfd_elf_generic_reloc, "R_386_SIZE32", 130 TRUE, 0xffffffff, 0xffffffff, FALSE), 131 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 132 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC", 133 TRUE, 0xffffffff, 0xffffffff, FALSE), 134 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 135 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL", 136 FALSE, 0, 0, FALSE), 137 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 138 bfd_elf_generic_reloc, "R_386_TLS_DESC", 139 TRUE, 0xffffffff, 0xffffffff, FALSE), 140 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 141 bfd_elf_generic_reloc, "R_386_IRELATIVE", 142 TRUE, 0xffffffff, 0xffffffff, FALSE), 143 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 144 bfd_elf_generic_reloc, "R_386_GOT32X", 145 TRUE, 0xffffffff, 0xffffffff, FALSE), 146 147 /* Another gap. */ 148 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset) 149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2) 150 151 /* GNU extension to record C++ vtable hierarchy. */ 152 HOWTO (R_386_GNU_VTINHERIT, /* type */ 153 0, /* rightshift */ 154 2, /* size (0 = byte, 1 = short, 2 = long) */ 155 0, /* bitsize */ 156 FALSE, /* pc_relative */ 157 0, /* bitpos */ 158 complain_overflow_dont, /* complain_on_overflow */ 159 NULL, /* special_function */ 160 "R_386_GNU_VTINHERIT", /* name */ 161 FALSE, /* partial_inplace */ 162 0, /* src_mask */ 163 0, /* dst_mask */ 164 FALSE), /* pcrel_offset */ 165 166 /* GNU extension to record C++ vtable member usage. */ 167 HOWTO (R_386_GNU_VTENTRY, /* type */ 168 0, /* rightshift */ 169 2, /* size (0 = byte, 1 = short, 2 = long) */ 170 0, /* bitsize */ 171 FALSE, /* pc_relative */ 172 0, /* bitpos */ 173 complain_overflow_dont, /* complain_on_overflow */ 174 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 175 "R_386_GNU_VTENTRY", /* name */ 176 FALSE, /* partial_inplace */ 177 0, /* src_mask */ 178 0, /* dst_mask */ 179 FALSE) /* pcrel_offset */ 180 181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset) 182 183 }; 184 185 #define X86_PCREL_TYPE_P(TYPE) ((TYPE) == R_386_PC32) 186 187 #define X86_SIZE_TYPE_P(TYPE) ((TYPE) == R_386_SIZE32) 188 189 #ifdef DEBUG_GEN_RELOC 190 #define TRACE(str) \ 191 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) 192 #else 193 #define TRACE(str) 194 #endif 195 196 static reloc_howto_type * 197 elf_i386_reloc_type_lookup (bfd *abfd, 198 bfd_reloc_code_real_type code) 199 { 200 switch (code) 201 { 202 case BFD_RELOC_NONE: 203 TRACE ("BFD_RELOC_NONE"); 204 return &elf_howto_table[R_386_NONE]; 205 206 case BFD_RELOC_32: 207 TRACE ("BFD_RELOC_32"); 208 return &elf_howto_table[R_386_32]; 209 210 case BFD_RELOC_CTOR: 211 TRACE ("BFD_RELOC_CTOR"); 212 return &elf_howto_table[R_386_32]; 213 214 case BFD_RELOC_32_PCREL: 215 TRACE ("BFD_RELOC_PC32"); 216 return &elf_howto_table[R_386_PC32]; 217 218 case BFD_RELOC_386_GOT32: 219 TRACE ("BFD_RELOC_386_GOT32"); 220 return &elf_howto_table[R_386_GOT32]; 221 222 case BFD_RELOC_386_PLT32: 223 TRACE ("BFD_RELOC_386_PLT32"); 224 return &elf_howto_table[R_386_PLT32]; 225 226 case BFD_RELOC_386_COPY: 227 TRACE ("BFD_RELOC_386_COPY"); 228 return &elf_howto_table[R_386_COPY]; 229 230 case BFD_RELOC_386_GLOB_DAT: 231 TRACE ("BFD_RELOC_386_GLOB_DAT"); 232 return &elf_howto_table[R_386_GLOB_DAT]; 233 234 case BFD_RELOC_386_JUMP_SLOT: 235 TRACE ("BFD_RELOC_386_JUMP_SLOT"); 236 return &elf_howto_table[R_386_JUMP_SLOT]; 237 238 case BFD_RELOC_386_RELATIVE: 239 TRACE ("BFD_RELOC_386_RELATIVE"); 240 return &elf_howto_table[R_386_RELATIVE]; 241 242 case BFD_RELOC_386_GOTOFF: 243 TRACE ("BFD_RELOC_386_GOTOFF"); 244 return &elf_howto_table[R_386_GOTOFF]; 245 246 case BFD_RELOC_386_GOTPC: 247 TRACE ("BFD_RELOC_386_GOTPC"); 248 return &elf_howto_table[R_386_GOTPC]; 249 250 /* These relocs are a GNU extension. */ 251 case BFD_RELOC_386_TLS_TPOFF: 252 TRACE ("BFD_RELOC_386_TLS_TPOFF"); 253 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset]; 254 255 case BFD_RELOC_386_TLS_IE: 256 TRACE ("BFD_RELOC_386_TLS_IE"); 257 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset]; 258 259 case BFD_RELOC_386_TLS_GOTIE: 260 TRACE ("BFD_RELOC_386_TLS_GOTIE"); 261 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset]; 262 263 case BFD_RELOC_386_TLS_LE: 264 TRACE ("BFD_RELOC_386_TLS_LE"); 265 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset]; 266 267 case BFD_RELOC_386_TLS_GD: 268 TRACE ("BFD_RELOC_386_TLS_GD"); 269 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset]; 270 271 case BFD_RELOC_386_TLS_LDM: 272 TRACE ("BFD_RELOC_386_TLS_LDM"); 273 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset]; 274 275 case BFD_RELOC_16: 276 TRACE ("BFD_RELOC_16"); 277 return &elf_howto_table[R_386_16 - R_386_ext_offset]; 278 279 case BFD_RELOC_16_PCREL: 280 TRACE ("BFD_RELOC_16_PCREL"); 281 return &elf_howto_table[R_386_PC16 - R_386_ext_offset]; 282 283 case BFD_RELOC_8: 284 TRACE ("BFD_RELOC_8"); 285 return &elf_howto_table[R_386_8 - R_386_ext_offset]; 286 287 case BFD_RELOC_8_PCREL: 288 TRACE ("BFD_RELOC_8_PCREL"); 289 return &elf_howto_table[R_386_PC8 - R_386_ext_offset]; 290 291 /* Common with Sun TLS implementation. */ 292 case BFD_RELOC_386_TLS_LDO_32: 293 TRACE ("BFD_RELOC_386_TLS_LDO_32"); 294 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset]; 295 296 case BFD_RELOC_386_TLS_IE_32: 297 TRACE ("BFD_RELOC_386_TLS_IE_32"); 298 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset]; 299 300 case BFD_RELOC_386_TLS_LE_32: 301 TRACE ("BFD_RELOC_386_TLS_LE_32"); 302 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset]; 303 304 case BFD_RELOC_386_TLS_DTPMOD32: 305 TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); 306 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset]; 307 308 case BFD_RELOC_386_TLS_DTPOFF32: 309 TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); 310 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset]; 311 312 case BFD_RELOC_386_TLS_TPOFF32: 313 TRACE ("BFD_RELOC_386_TLS_TPOFF32"); 314 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset]; 315 316 case BFD_RELOC_SIZE32: 317 TRACE ("BFD_RELOC_SIZE32"); 318 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset]; 319 320 case BFD_RELOC_386_TLS_GOTDESC: 321 TRACE ("BFD_RELOC_386_TLS_GOTDESC"); 322 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset]; 323 324 case BFD_RELOC_386_TLS_DESC_CALL: 325 TRACE ("BFD_RELOC_386_TLS_DESC_CALL"); 326 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset]; 327 328 case BFD_RELOC_386_TLS_DESC: 329 TRACE ("BFD_RELOC_386_TLS_DESC"); 330 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset]; 331 332 case BFD_RELOC_386_IRELATIVE: 333 TRACE ("BFD_RELOC_386_IRELATIVE"); 334 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset]; 335 336 case BFD_RELOC_386_GOT32X: 337 TRACE ("BFD_RELOC_386_GOT32X"); 338 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset]; 339 340 case BFD_RELOC_VTABLE_INHERIT: 341 TRACE ("BFD_RELOC_VTABLE_INHERIT"); 342 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset]; 343 344 case BFD_RELOC_VTABLE_ENTRY: 345 TRACE ("BFD_RELOC_VTABLE_ENTRY"); 346 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset]; 347 348 default: 349 TRACE ("Unknown"); 350 /* xgettext:c-format */ 351 _bfd_error_handler (_("%pB: unsupported relocation type: %#x"), 352 abfd, (int) code); 353 bfd_set_error (bfd_error_bad_value); 354 return NULL; 355 } 356 } 357 358 static reloc_howto_type * 359 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 360 const char *r_name) 361 { 362 unsigned int i; 363 364 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) 365 if (elf_howto_table[i].name != NULL 366 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 367 return &elf_howto_table[i]; 368 369 return NULL; 370 } 371 372 static reloc_howto_type * 373 elf_i386_rtype_to_howto (unsigned r_type) 374 { 375 unsigned int indx; 376 377 if ((indx = r_type) >= R_386_standard 378 && ((indx = r_type - R_386_ext_offset) - R_386_standard 379 >= R_386_ext - R_386_standard) 380 && ((indx = r_type - R_386_tls_offset) - R_386_ext 381 >= R_386_ext2 - R_386_ext) 382 && ((indx = r_type - R_386_vt_offset) - R_386_ext2 383 >= R_386_vt - R_386_ext2)) 384 return NULL; 385 /* PR 17512: file: 0f67f69d. */ 386 if (elf_howto_table [indx].type != r_type) 387 return NULL; 388 return &elf_howto_table[indx]; 389 } 390 391 static bfd_boolean 392 elf_i386_info_to_howto_rel (bfd *abfd, 393 arelent *cache_ptr, 394 Elf_Internal_Rela *dst) 395 { 396 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 397 398 if ((cache_ptr->howto = elf_i386_rtype_to_howto (r_type)) == NULL) 399 { 400 /* xgettext:c-format */ 401 _bfd_error_handler (_("%pB: unsupported relocation type %#x"), 402 abfd, r_type); 403 bfd_set_error (bfd_error_bad_value); 404 return FALSE; 405 } 406 407 return TRUE; 408 } 409 410 /* Return whether a symbol name implies a local label. The UnixWare 411 2.1 cc generates temporary symbols that start with .X, so we 412 recognize them here. FIXME: do other SVR4 compilers also use .X?. 413 If so, we should move the .X recognition into 414 _bfd_elf_is_local_label_name. */ 415 416 static bfd_boolean 417 elf_i386_is_local_label_name (bfd *abfd, const char *name) 418 { 419 if (name[0] == '.' && name[1] == 'X') 420 return TRUE; 421 422 return _bfd_elf_is_local_label_name (abfd, name); 423 } 424 425 /* Support for core dump NOTE sections. */ 426 427 static bfd_boolean 428 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 429 { 430 int offset; 431 size_t size; 432 433 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 434 { 435 int pr_version = bfd_get_32 (abfd, note->descdata); 436 437 if (pr_version != 1) 438 return FALSE; 439 440 /* pr_cursig */ 441 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20); 442 443 /* pr_pid */ 444 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 445 446 /* pr_reg */ 447 offset = 28; 448 size = bfd_get_32 (abfd, note->descdata + 8); 449 } 450 else 451 { 452 switch (note->descsz) 453 { 454 default: 455 return FALSE; 456 457 case 144: /* Linux/i386 */ 458 /* pr_cursig */ 459 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 460 461 /* pr_pid */ 462 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 463 464 /* pr_reg */ 465 offset = 72; 466 size = 68; 467 468 break; 469 } 470 } 471 472 /* Make a ".reg/999" section. */ 473 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 474 size, note->descpos + offset); 475 } 476 477 static bfd_boolean 478 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 479 { 480 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 481 { 482 int pr_version = bfd_get_32 (abfd, note->descdata); 483 484 if (pr_version != 1) 485 return FALSE; 486 487 elf_tdata (abfd)->core->program 488 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); 489 elf_tdata (abfd)->core->command 490 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); 491 } 492 else 493 { 494 switch (note->descsz) 495 { 496 default: 497 return FALSE; 498 499 case 124: /* Linux/i386 elf_prpsinfo. */ 500 elf_tdata (abfd)->core->pid 501 = bfd_get_32 (abfd, note->descdata + 12); 502 elf_tdata (abfd)->core->program 503 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 504 elf_tdata (abfd)->core->command 505 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 506 } 507 } 508 509 /* Note that for some reason, a spurious space is tacked 510 onto the end of the args in some (at least one anyway) 511 implementations, so strip it off if it exists. */ 512 { 513 char *command = elf_tdata (abfd)->core->command; 514 int n = strlen (command); 515 516 if (0 < n && command[n - 1] == ' ') 517 command[n - 1] = '\0'; 518 } 519 520 return TRUE; 521 } 522 523 /* Functions for the i386 ELF linker. 524 525 In order to gain some understanding of code in this file without 526 knowing all the intricate details of the linker, note the 527 following: 528 529 Functions named elf_i386_* are called by external routines, other 530 functions are only called locally. elf_i386_* functions appear 531 in this file more or less in the order in which they are called 532 from external routines. eg. elf_i386_check_relocs is called 533 early in the link process, elf_i386_finish_dynamic_sections is 534 one of the last functions. */ 535 536 /* The size in bytes of an entry in the lazy procedure linkage table. */ 537 538 #define LAZY_PLT_ENTRY_SIZE 16 539 540 /* The size in bytes of an entry in the non-lazy procedure linkage 541 table. */ 542 543 #define NON_LAZY_PLT_ENTRY_SIZE 8 544 545 /* The first entry in an absolute lazy procedure linkage table looks 546 like this. See the SVR4 ABI i386 supplement to see how this works. 547 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */ 548 549 static const bfd_byte elf_i386_lazy_plt0_entry[12] = 550 { 551 0xff, 0x35, /* pushl contents of address */ 552 0, 0, 0, 0, /* replaced with address of .got + 4. */ 553 0xff, 0x25, /* jmp indirect */ 554 0, 0, 0, 0 /* replaced with address of .got + 8. */ 555 }; 556 557 /* Subsequent entries in an absolute lazy procedure linkage table look 558 like this. */ 559 560 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] = 561 { 562 0xff, 0x25, /* jmp indirect */ 563 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ 564 0x68, /* pushl immediate */ 565 0, 0, 0, 0, /* replaced with offset into relocation table. */ 566 0xe9, /* jmp relative */ 567 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 568 }; 569 570 /* The first entry in a PIC lazy procedure linkage table look like 571 this. Will be padded to LAZY_PLT_ENTRY_SIZE with 572 lazy_plt->plt0_pad_byte. */ 573 574 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] = 575 { 576 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ 577 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */ 578 }; 579 580 /* Subsequent entries in a PIC lazy procedure linkage table look like 581 this. */ 582 583 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] = 584 { 585 0xff, 0xa3, /* jmp *offset(%ebx) */ 586 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 587 0x68, /* pushl immediate */ 588 0, 0, 0, 0, /* replaced with offset into relocation table. */ 589 0xe9, /* jmp relative */ 590 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 591 }; 592 593 /* Entries in the non-lazy procedure linkage table look like this. */ 594 595 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = 596 { 597 0xff, 0x25, /* jmp indirect */ 598 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 599 0x66, 0x90 /* xchg %ax,%ax */ 600 }; 601 602 /* Entries in the PIC non-lazy procedure linkage table look like 603 this. */ 604 605 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = 606 { 607 0xff, 0xa3, /* jmp *offset(%ebx) */ 608 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 609 0x66, 0x90 /* xchg %ax,%ax */ 610 }; 611 612 /* The first entry in an absolute IBT-enabled lazy procedure linkage 613 table looks like this. */ 614 615 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] = 616 { 617 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */ 618 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */ 619 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ 620 }; 621 622 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage 623 table look like this. Subsequent entries for a PIC IBT-enabled lazy 624 procedure linkage table are the same. */ 625 626 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 627 { 628 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */ 629 0x68, 0, 0, 0, 0, /* pushl immediate */ 630 0xe9, 0, 0, 0, 0, /* jmp relative */ 631 0x66, 0x90 /* xchg %ax,%ax */ 632 }; 633 634 /* The first entry in a PIC IBT-enabled lazy procedure linkage table 635 look like. */ 636 637 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] = 638 { 639 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ 640 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ 641 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ 642 }; 643 644 /* Entries for branches with IBT-enabled in the absolute non-lazey 645 procedure linkage table look like this. They have the same size 646 as the lazy PLT entry. */ 647 648 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 649 { 650 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */ 651 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */ 652 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */ 653 }; 654 655 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure 656 linkage table look like this. They have the same size as the lazy 657 PLT entry. */ 658 659 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = 660 { 661 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */ 662 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */ 663 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */ 664 }; 665 666 /* .eh_frame covering the lazy .plt section. */ 667 668 static const bfd_byte elf_i386_eh_frame_lazy_plt[] = 669 { 670 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 671 0, 0, 0, 0, /* CIE ID */ 672 1, /* CIE version */ 673 'z', 'R', 0, /* Augmentation string */ 674 1, /* Code alignment factor */ 675 0x7c, /* Data alignment factor */ 676 8, /* Return address column */ 677 1, /* Augmentation size */ 678 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 679 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ 680 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ 681 DW_CFA_nop, DW_CFA_nop, 682 683 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 684 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 685 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ 686 0, 0, 0, 0, /* .plt size goes here */ 687 0, /* Augmentation size */ 688 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ 689 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 690 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ 691 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 692 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 693 11, /* Block length */ 694 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ 695 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ 696 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, 697 DW_OP_lit2, DW_OP_shl, DW_OP_plus, 698 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 699 }; 700 701 /* .eh_frame covering the lazy .plt section with IBT-enabled. */ 702 703 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] = 704 { 705 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 706 0, 0, 0, 0, /* CIE ID */ 707 1, /* CIE version */ 708 'z', 'R', 0, /* Augmentation string */ 709 1, /* Code alignment factor */ 710 0x7c, /* Data alignment factor */ 711 8, /* Return address column */ 712 1, /* Augmentation size */ 713 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 714 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ 715 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ 716 DW_CFA_nop, DW_CFA_nop, 717 718 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 719 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 720 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ 721 0, 0, 0, 0, /* .plt size goes here */ 722 0, /* Augmentation size */ 723 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ 724 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 725 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ 726 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 727 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 728 11, /* Block length */ 729 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ 730 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ 731 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge, 732 DW_OP_lit2, DW_OP_shl, DW_OP_plus, 733 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 734 }; 735 736 /* .eh_frame covering the non-lazy .plt section. */ 737 738 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] = 739 { 740 #define PLT_GOT_FDE_LENGTH 16 741 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 742 0, 0, 0, 0, /* CIE ID */ 743 1, /* CIE version */ 744 'z', 'R', 0, /* Augmentation string */ 745 1, /* Code alignment factor */ 746 0x7c, /* Data alignment factor */ 747 8, /* Return address column */ 748 1, /* Augmentation size */ 749 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 750 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ 751 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ 752 DW_CFA_nop, DW_CFA_nop, 753 754 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 755 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 756 0, 0, 0, 0, /* the start of non-lazy .plt goes here */ 757 0, 0, 0, 0, /* non-lazy .plt size goes here */ 758 0, /* Augmentation size */ 759 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 760 }; 761 762 /* These are the standard parameters. */ 763 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt = 764 { 765 elf_i386_lazy_plt0_entry, /* plt0_entry */ 766 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */ 767 elf_i386_lazy_plt_entry, /* plt_entry */ 768 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 769 NULL, /* plt_tlsdesc_entry */ 770 0, /* plt_tlsdesc_entry_size*/ 771 0, /* plt_tlsdesc_got1_offset */ 772 0, /* plt_tlsdesc_got2_offset */ 773 0, /* plt_tlsdesc_got1_insn_end */ 774 0, /* plt_tlsdesc_got2_insn_end */ 775 2, /* plt0_got1_offset */ 776 8, /* plt0_got2_offset */ 777 0, /* plt0_got2_insn_end */ 778 2, /* plt_got_offset */ 779 7, /* plt_reloc_offset */ 780 12, /* plt_plt_offset */ 781 0, /* plt_got_insn_size */ 782 0, /* plt_plt_insn_end */ 783 6, /* plt_lazy_offset */ 784 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */ 785 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */ 786 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */ 787 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */ 788 }; 789 790 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt = 791 { 792 elf_i386_non_lazy_plt_entry, /* plt_entry */ 793 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */ 794 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 795 2, /* plt_got_offset */ 796 0, /* plt_got_insn_size */ 797 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */ 798 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 799 }; 800 801 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt = 802 { 803 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */ 804 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */ 805 elf_i386_lazy_ibt_plt_entry, /* plt_entry */ 806 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 807 NULL, /* plt_tlsdesc_entry */ 808 0, /* plt_tlsdesc_entry_size*/ 809 0, /* plt_tlsdesc_got1_offset */ 810 0, /* plt_tlsdesc_got2_offset */ 811 0, /* plt_tlsdesc_got1_insn_end */ 812 0, /* plt_tlsdesc_got2_insn_end */ 813 2, /* plt0_got1_offset */ 814 8, /* plt0_got2_offset */ 815 0, /* plt0_got2_insn_end */ 816 4+2, /* plt_got_offset */ 817 4+1, /* plt_reloc_offset */ 818 4+6, /* plt_plt_offset */ 819 0, /* plt_got_insn_size */ 820 0, /* plt_plt_insn_end */ 821 0, /* plt_lazy_offset */ 822 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */ 823 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */ 824 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */ 825 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */ 826 }; 827 828 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt = 829 { 830 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */ 831 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */ 832 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ 833 4+2, /* plt_got_offset */ 834 0, /* plt_got_insn_size */ 835 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */ 836 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ 837 }; 838 839 840 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations 841 for the PLTResolve stub and then for each PLT entry. */ 842 #define PLTRESOLVE_RELOCS_SHLIB 0 843 #define PLTRESOLVE_RELOCS 2 844 #define PLT_NON_JUMP_SLOT_RELOCS 2 845 846 /* These are the standard parameters. */ 847 static const struct elf_x86_backend_data elf_i386_arch_bed = 848 { 849 is_normal /* os */ 850 }; 851 852 #define elf_backend_arch_data &elf_i386_arch_bed 853 854 /* Return TRUE if the TLS access code sequence support transition 855 from R_TYPE. */ 856 857 static bfd_boolean 858 elf_i386_check_tls_transition (asection *sec, 859 bfd_byte *contents, 860 Elf_Internal_Shdr *symtab_hdr, 861 struct elf_link_hash_entry **sym_hashes, 862 unsigned int r_type, 863 const Elf_Internal_Rela *rel, 864 const Elf_Internal_Rela *relend) 865 { 866 unsigned int val, type, reg; 867 unsigned long r_symndx; 868 struct elf_link_hash_entry *h; 869 bfd_vma offset; 870 bfd_byte *call; 871 bfd_boolean indirect_call; 872 873 offset = rel->r_offset; 874 switch (r_type) 875 { 876 case R_386_TLS_GD: 877 case R_386_TLS_LDM: 878 if (offset < 2 || (rel + 1) >= relend) 879 return FALSE; 880 881 indirect_call = FALSE; 882 call = contents + offset + 4; 883 val = *(call - 5); 884 type = *(call - 6); 885 if (r_type == R_386_TLS_GD) 886 { 887 /* Check transition from GD access model. Only 888 leal foo@tlsgd(,%ebx,1), %eax 889 call ___tls_get_addr@PLT 890 or 891 leal foo@tlsgd(%ebx) %eax 892 call ___tls_get_addr@PLT 893 nop 894 or 895 leal foo@tlsgd(%reg), %eax 896 call *___tls_get_addr@GOT(%reg) 897 which may be converted to 898 addr32 call ___tls_get_addr 899 can transit to different access model. */ 900 if ((offset + 10) > sec->size 901 || (type != 0x8d && type != 0x04)) 902 return FALSE; 903 904 if (type == 0x04) 905 { 906 /* leal foo@tlsgd(,%ebx,1), %eax 907 call ___tls_get_addr@PLT */ 908 if (offset < 3) 909 return FALSE; 910 911 if (*(call - 7) != 0x8d 912 || val != 0x1d 913 || call[0] != 0xe8) 914 return FALSE; 915 } 916 else 917 { 918 /* This must be 919 leal foo@tlsgd(%ebx), %eax 920 call ___tls_get_addr@PLT 921 nop 922 or 923 leal foo@tlsgd(%reg), %eax 924 call *___tls_get_addr@GOT(%reg) 925 which may be converted to 926 addr32 call ___tls_get_addr 927 928 %eax can't be used as the GOT base register since it 929 is used to pass parameter to ___tls_get_addr. */ 930 reg = val & 7; 931 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0) 932 return FALSE; 933 934 indirect_call = call[0] == 0xff; 935 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90) 936 && !(call[0] == 0x67 && call[1] == 0xe8) 937 && !(indirect_call 938 && (call[1] & 0xf8) == 0x90 939 && (call[1] & 0x7) == reg)) 940 return FALSE; 941 } 942 } 943 else 944 { 945 /* Check transition from LD access model. Only 946 leal foo@tlsldm(%ebx), %eax 947 call ___tls_get_addr@PLT 948 or 949 leal foo@tlsldm(%reg), %eax 950 call *___tls_get_addr@GOT(%reg) 951 which may be converted to 952 addr32 call ___tls_get_addr 953 can transit to different access model. */ 954 if (type != 0x8d || (offset + 9) > sec->size) 955 return FALSE; 956 957 /* %eax can't be used as the GOT base register since it is 958 used to pass parameter to ___tls_get_addr. */ 959 reg = val & 7; 960 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0) 961 return FALSE; 962 963 indirect_call = call[0] == 0xff; 964 if (!(reg == 3 && call[0] == 0xe8) 965 && !(call[0] == 0x67 && call[1] == 0xe8) 966 && !(indirect_call 967 && (call[1] & 0xf8) == 0x90 968 && (call[1] & 0x7) == reg)) 969 return FALSE; 970 } 971 972 r_symndx = ELF32_R_SYM (rel[1].r_info); 973 if (r_symndx < symtab_hdr->sh_info) 974 return FALSE; 975 976 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 977 if (h == NULL 978 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr) 979 return FALSE; 980 else if (indirect_call) 981 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X); 982 else 983 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32 984 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 985 986 case R_386_TLS_IE: 987 /* Check transition from IE access model: 988 movl foo@indntpoff(%rip), %eax 989 movl foo@indntpoff(%rip), %reg 990 addl foo@indntpoff(%rip), %reg 991 */ 992 993 if (offset < 1 || (offset + 4) > sec->size) 994 return FALSE; 995 996 /* Check "movl foo@tpoff(%rip), %eax" first. */ 997 val = bfd_get_8 (abfd, contents + offset - 1); 998 if (val == 0xa1) 999 return TRUE; 1000 1001 if (offset < 2) 1002 return FALSE; 1003 1004 /* Check movl|addl foo@tpoff(%rip), %reg. */ 1005 type = bfd_get_8 (abfd, contents + offset - 2); 1006 return ((type == 0x8b || type == 0x03) 1007 && (val & 0xc7) == 0x05); 1008 1009 case R_386_TLS_GOTIE: 1010 case R_386_TLS_IE_32: 1011 /* Check transition from {IE_32,GOTIE} access model: 1012 subl foo@{tpoff,gontoff}(%reg1), %reg2 1013 movl foo@{tpoff,gontoff}(%reg1), %reg2 1014 addl foo@{tpoff,gontoff}(%reg1), %reg2 1015 */ 1016 1017 if (offset < 2 || (offset + 4) > sec->size) 1018 return FALSE; 1019 1020 val = bfd_get_8 (abfd, contents + offset - 1); 1021 if ((val & 0xc0) != 0x80 || (val & 7) == 4) 1022 return FALSE; 1023 1024 type = bfd_get_8 (abfd, contents + offset - 2); 1025 return type == 0x8b || type == 0x2b || type == 0x03; 1026 1027 case R_386_TLS_GOTDESC: 1028 /* Check transition from GDesc access model: 1029 leal x@tlsdesc(%ebx), %eax 1030 1031 Make sure it's a leal adding ebx to a 32-bit offset 1032 into any register, although it's probably almost always 1033 going to be eax. */ 1034 1035 if (offset < 2 || (offset + 4) > sec->size) 1036 return FALSE; 1037 1038 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) 1039 return FALSE; 1040 1041 val = bfd_get_8 (abfd, contents + offset - 1); 1042 return (val & 0xc7) == 0x83; 1043 1044 case R_386_TLS_DESC_CALL: 1045 /* Check transition from GDesc access model: 1046 call *x@tlsdesc(%eax) 1047 */ 1048 if (offset + 2 <= sec->size) 1049 { 1050 /* Make sure that it's a call *x@tlsdesc(%eax). */ 1051 call = contents + offset; 1052 return call[0] == 0xff && call[1] == 0x10; 1053 } 1054 1055 return FALSE; 1056 1057 default: 1058 abort (); 1059 } 1060 } 1061 1062 /* Return TRUE if the TLS access transition is OK or no transition 1063 will be performed. Update R_TYPE if there is a transition. */ 1064 1065 static bfd_boolean 1066 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd, 1067 asection *sec, bfd_byte *contents, 1068 Elf_Internal_Shdr *symtab_hdr, 1069 struct elf_link_hash_entry **sym_hashes, 1070 unsigned int *r_type, int tls_type, 1071 const Elf_Internal_Rela *rel, 1072 const Elf_Internal_Rela *relend, 1073 struct elf_link_hash_entry *h, 1074 unsigned long r_symndx, 1075 bfd_boolean from_relocate_section) 1076 { 1077 unsigned int from_type = *r_type; 1078 unsigned int to_type = from_type; 1079 bfd_boolean check = TRUE; 1080 1081 /* Skip TLS transition for functions. */ 1082 if (h != NULL 1083 && (h->type == STT_FUNC 1084 || h->type == STT_GNU_IFUNC)) 1085 return TRUE; 1086 1087 switch (from_type) 1088 { 1089 case R_386_TLS_GD: 1090 case R_386_TLS_GOTDESC: 1091 case R_386_TLS_DESC_CALL: 1092 case R_386_TLS_IE_32: 1093 case R_386_TLS_IE: 1094 case R_386_TLS_GOTIE: 1095 if (bfd_link_executable (info)) 1096 { 1097 if (h == NULL) 1098 to_type = R_386_TLS_LE_32; 1099 else if (from_type != R_386_TLS_IE 1100 && from_type != R_386_TLS_GOTIE) 1101 to_type = R_386_TLS_IE_32; 1102 } 1103 1104 /* When we are called from elf_i386_relocate_section, there may 1105 be additional transitions based on TLS_TYPE. */ 1106 if (from_relocate_section) 1107 { 1108 unsigned int new_to_type = to_type; 1109 1110 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type)) 1111 new_to_type = R_386_TLS_LE_32; 1112 1113 if (to_type == R_386_TLS_GD 1114 || to_type == R_386_TLS_GOTDESC 1115 || to_type == R_386_TLS_DESC_CALL) 1116 { 1117 if (tls_type == GOT_TLS_IE_POS) 1118 new_to_type = R_386_TLS_GOTIE; 1119 else if (tls_type & GOT_TLS_IE) 1120 new_to_type = R_386_TLS_IE_32; 1121 } 1122 1123 /* We checked the transition before when we were called from 1124 elf_i386_check_relocs. We only want to check the new 1125 transition which hasn't been checked before. */ 1126 check = new_to_type != to_type && from_type == to_type; 1127 to_type = new_to_type; 1128 } 1129 1130 break; 1131 1132 case R_386_TLS_LDM: 1133 if (bfd_link_executable (info)) 1134 to_type = R_386_TLS_LE_32; 1135 break; 1136 1137 default: 1138 return TRUE; 1139 } 1140 1141 /* Return TRUE if there is no transition. */ 1142 if (from_type == to_type) 1143 return TRUE; 1144 1145 /* Check if the transition can be performed. */ 1146 if (check 1147 && ! elf_i386_check_tls_transition (sec, contents, 1148 symtab_hdr, sym_hashes, 1149 from_type, rel, relend)) 1150 { 1151 reloc_howto_type *from, *to; 1152 const char *name; 1153 1154 from = elf_i386_rtype_to_howto (from_type); 1155 to = elf_i386_rtype_to_howto (to_type); 1156 1157 if (h) 1158 name = h->root.root.string; 1159 else 1160 { 1161 struct elf_x86_link_hash_table *htab; 1162 1163 htab = elf_x86_hash_table (info, I386_ELF_DATA); 1164 if (htab == NULL) 1165 name = "*unknown*"; 1166 else 1167 { 1168 Elf_Internal_Sym *isym; 1169 1170 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1171 abfd, r_symndx); 1172 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); 1173 } 1174 } 1175 1176 _bfd_error_handler 1177 /* xgettext:c-format */ 1178 (_("%pB: TLS transition from %s to %s against `%s'" 1179 " at %#" PRIx64 " in section `%pA' failed"), 1180 abfd, from->name, to->name, name, 1181 (uint64_t) rel->r_offset, sec); 1182 bfd_set_error (bfd_error_bad_value); 1183 return FALSE; 1184 } 1185 1186 *r_type = to_type; 1187 return TRUE; 1188 } 1189 1190 /* With the local symbol, foo, we convert 1191 mov foo@GOT[(%reg1)], %reg2 1192 to 1193 lea foo[@GOTOFF(%reg1)], %reg2 1194 and convert 1195 call/jmp *foo@GOT[(%reg)] 1196 to 1197 nop call foo/jmp foo nop 1198 When PIC is false, convert 1199 test %reg1, foo@GOT[(%reg2)] 1200 to 1201 test $foo, %reg1 1202 and convert 1203 binop foo@GOT[(%reg1)], %reg2 1204 to 1205 binop $foo, %reg2 1206 where binop is one of adc, add, and, cmp, or, sbb, sub, xor 1207 instructions. */ 1208 1209 static 1210 bfd_boolean 1211 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr, 1212 bfd_byte *contents, 1213 unsigned int *r_type_p, 1214 Elf_Internal_Rela *irel, 1215 struct elf_link_hash_entry *h, 1216 bfd_boolean *converted, 1217 struct bfd_link_info *link_info) 1218 { 1219 struct elf_x86_link_hash_table *htab; 1220 unsigned int opcode; 1221 unsigned int modrm; 1222 bfd_boolean baseless; 1223 Elf_Internal_Sym *isym; 1224 unsigned int addend; 1225 unsigned int nop; 1226 bfd_vma nop_offset; 1227 bfd_boolean is_pic; 1228 bfd_boolean to_reloc_32; 1229 unsigned int r_type; 1230 unsigned int r_symndx; 1231 bfd_vma roff = irel->r_offset; 1232 bfd_boolean local_ref; 1233 struct elf_x86_link_hash_entry *eh; 1234 1235 if (roff < 2) 1236 return TRUE; 1237 1238 /* Addend for R_386_GOT32X relocations must be 0. */ 1239 addend = bfd_get_32 (abfd, contents + roff); 1240 if (addend != 0) 1241 return TRUE; 1242 1243 htab = elf_x86_hash_table (link_info, I386_ELF_DATA); 1244 is_pic = bfd_link_pic (link_info); 1245 1246 r_type = *r_type_p; 1247 r_symndx = ELF32_R_SYM (irel->r_info); 1248 1249 modrm = bfd_get_8 (abfd, contents + roff - 1); 1250 baseless = (modrm & 0xc7) == 0x5; 1251 1252 if (baseless && is_pic) 1253 { 1254 /* For PIC, disallow R_386_GOT32X without a base register 1255 since we don't know what the GOT base is. */ 1256 const char *name; 1257 1258 if (h == NULL) 1259 { 1260 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, 1261 r_symndx); 1262 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); 1263 } 1264 else 1265 name = h->root.root.string; 1266 1267 _bfd_error_handler 1268 /* xgettext:c-format */ 1269 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base" 1270 " register can not be used when making a shared object"), 1271 abfd, name); 1272 return FALSE; 1273 } 1274 1275 opcode = bfd_get_8 (abfd, contents + roff - 2); 1276 1277 /* Convert to R_386_32 if PIC is false or there is no base 1278 register. */ 1279 to_reloc_32 = !is_pic || baseless; 1280 1281 eh = elf_x86_hash_entry (h); 1282 1283 /* Try to convert R_386_GOT32X. Get the symbol referred to by the 1284 reloc. */ 1285 if (h == NULL) 1286 { 1287 if (opcode == 0x0ff) 1288 /* Convert "call/jmp *foo@GOT[(%reg)]". */ 1289 goto convert_branch; 1290 else 1291 /* Convert "mov foo@GOT[(%reg1)], %reg2", 1292 "test %reg1, foo@GOT(%reg2)" and 1293 "binop foo@GOT[(%reg1)], %reg2". */ 1294 goto convert_load; 1295 } 1296 1297 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */ 1298 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h); 1299 1300 /* Undefined weak symbol is only bound locally in executable 1301 and its reference is resolved as 0. */ 1302 if (h->root.type == bfd_link_hash_undefweak 1303 && !eh->linker_def 1304 && local_ref) 1305 { 1306 if (opcode == 0xff) 1307 { 1308 /* No direct branch to 0 for PIC. */ 1309 if (is_pic) 1310 return TRUE; 1311 else 1312 goto convert_branch; 1313 } 1314 else 1315 { 1316 /* We can convert load of address 0 to R_386_32. */ 1317 to_reloc_32 = TRUE; 1318 goto convert_load; 1319 } 1320 } 1321 1322 if (opcode == 0xff) 1323 { 1324 /* We have "call/jmp *foo@GOT[(%reg)]". */ 1325 if ((h->root.type == bfd_link_hash_defined 1326 || h->root.type == bfd_link_hash_defweak) 1327 && local_ref) 1328 { 1329 /* The function is locally defined. */ 1330 convert_branch: 1331 /* Convert R_386_GOT32X to R_386_PC32. */ 1332 if (modrm == 0x15 || (modrm & 0xf8) == 0x90) 1333 { 1334 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE 1335 is a nop prefix. */ 1336 modrm = 0xe8; 1337 /* To support TLS optimization, always use addr32 prefix 1338 for "call *___tls_get_addr@GOT(%reg)". */ 1339 if (eh && eh->tls_get_addr) 1340 { 1341 nop = 0x67; 1342 nop_offset = irel->r_offset - 2; 1343 } 1344 else 1345 { 1346 nop = htab->params->call_nop_byte; 1347 if (htab->params->call_nop_as_suffix) 1348 { 1349 nop_offset = roff + 3; 1350 irel->r_offset -= 1; 1351 } 1352 else 1353 nop_offset = roff - 2; 1354 } 1355 } 1356 else 1357 { 1358 /* Convert to "jmp foo nop". */ 1359 modrm = 0xe9; 1360 nop = NOP_OPCODE; 1361 nop_offset = roff + 3; 1362 irel->r_offset -= 1; 1363 } 1364 1365 bfd_put_8 (abfd, nop, contents + nop_offset); 1366 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1); 1367 /* When converting to PC-relative relocation, we 1368 need to adjust addend by -4. */ 1369 bfd_put_32 (abfd, -4, contents + irel->r_offset); 1370 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32); 1371 *r_type_p = R_386_PC32; 1372 *converted = TRUE; 1373 } 1374 } 1375 else 1376 { 1377 /* We have "mov foo@GOT[(%re1g)], %reg2", 1378 "test %reg1, foo@GOT(%reg2)" and 1379 "binop foo@GOT[(%reg1)], %reg2". 1380 1381 Avoid optimizing _DYNAMIC since ld.so may use its 1382 link-time address. */ 1383 if (h == htab->elf.hdynamic) 1384 return TRUE; 1385 1386 /* def_regular is set by an assignment in a linker script in 1387 bfd_elf_record_link_assignment. start_stop is set on 1388 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */ 1389 if (h->start_stop 1390 || eh->linker_def 1391 || ((h->def_regular 1392 || h->root.type == bfd_link_hash_defined 1393 || h->root.type == bfd_link_hash_defweak) 1394 && local_ref)) 1395 { 1396 convert_load: 1397 if (opcode == 0x8b) 1398 { 1399 if (to_reloc_32) 1400 { 1401 /* Convert "mov foo@GOT[(%reg1)], %reg2" to 1402 "mov $foo, %reg2" with R_386_32. */ 1403 r_type = R_386_32; 1404 modrm = 0xc0 | (modrm & 0x38) >> 3; 1405 bfd_put_8 (abfd, modrm, contents + roff - 1); 1406 opcode = 0xc7; 1407 } 1408 else 1409 { 1410 /* Convert "mov foo@GOT(%reg1), %reg2" to 1411 "lea foo@GOTOFF(%reg1), %reg2". */ 1412 r_type = R_386_GOTOFF; 1413 opcode = 0x8d; 1414 } 1415 } 1416 else 1417 { 1418 /* Only R_386_32 is supported. */ 1419 if (!to_reloc_32) 1420 return TRUE; 1421 1422 if (opcode == 0x85) 1423 { 1424 /* Convert "test %reg1, foo@GOT(%reg2)" to 1425 "test $foo, %reg1". */ 1426 modrm = 0xc0 | (modrm & 0x38) >> 3; 1427 opcode = 0xf7; 1428 } 1429 else 1430 { 1431 /* Convert "binop foo@GOT(%reg1), %reg2" to 1432 "binop $foo, %reg2". */ 1433 modrm = (0xc0 1434 | (modrm & 0x38) >> 3 1435 | (opcode & 0x3c)); 1436 opcode = 0x81; 1437 } 1438 bfd_put_8 (abfd, modrm, contents + roff - 1); 1439 r_type = R_386_32; 1440 } 1441 1442 bfd_put_8 (abfd, opcode, contents + roff - 2); 1443 irel->r_info = ELF32_R_INFO (r_symndx, r_type); 1444 *r_type_p = r_type; 1445 *converted = TRUE; 1446 } 1447 } 1448 1449 return TRUE; 1450 } 1451 1452 /* Rename some of the generic section flags to better document how they 1453 are used here. */ 1454 #define check_relocs_failed sec_flg0 1455 1456 /* Look through the relocs for a section during the first phase, and 1457 calculate needed space in the global offset table, procedure linkage 1458 table, and dynamic reloc sections. */ 1459 1460 static bfd_boolean 1461 elf_i386_check_relocs (bfd *abfd, 1462 struct bfd_link_info *info, 1463 asection *sec, 1464 const Elf_Internal_Rela *relocs) 1465 { 1466 struct elf_x86_link_hash_table *htab; 1467 Elf_Internal_Shdr *symtab_hdr; 1468 struct elf_link_hash_entry **sym_hashes; 1469 const Elf_Internal_Rela *rel; 1470 const Elf_Internal_Rela *rel_end; 1471 asection *sreloc; 1472 bfd_byte *contents; 1473 bfd_boolean converted; 1474 1475 if (bfd_link_relocatable (info)) 1476 return TRUE; 1477 1478 /* Don't do anything special with non-loaded, non-alloced sections. 1479 In particular, any relocs in such sections should not affect GOT 1480 and PLT reference counting (ie. we don't allow them to create GOT 1481 or PLT entries), there's no possibility or desire to optimize TLS 1482 relocs, and there's not much point in propagating relocs to shared 1483 libs that the dynamic linker won't relocate. */ 1484 if ((sec->flags & SEC_ALLOC) == 0) 1485 return TRUE; 1486 1487 htab = elf_x86_hash_table (info, I386_ELF_DATA); 1488 if (htab == NULL) 1489 { 1490 sec->check_relocs_failed = 1; 1491 return FALSE; 1492 } 1493 1494 BFD_ASSERT (is_x86_elf (abfd, htab)); 1495 1496 /* Get the section contents. */ 1497 if (elf_section_data (sec)->this_hdr.contents != NULL) 1498 contents = elf_section_data (sec)->this_hdr.contents; 1499 else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1500 { 1501 sec->check_relocs_failed = 1; 1502 return FALSE; 1503 } 1504 1505 symtab_hdr = &elf_symtab_hdr (abfd); 1506 sym_hashes = elf_sym_hashes (abfd); 1507 1508 converted = FALSE; 1509 1510 sreloc = NULL; 1511 1512 rel_end = relocs + sec->reloc_count; 1513 for (rel = relocs; rel < rel_end; rel++) 1514 { 1515 unsigned int r_type; 1516 unsigned int r_symndx; 1517 struct elf_link_hash_entry *h; 1518 struct elf_x86_link_hash_entry *eh; 1519 Elf_Internal_Sym *isym; 1520 const char *name; 1521 bfd_boolean size_reloc; 1522 1523 r_symndx = ELF32_R_SYM (rel->r_info); 1524 r_type = ELF32_R_TYPE (rel->r_info); 1525 1526 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 1527 { 1528 /* xgettext:c-format */ 1529 _bfd_error_handler (_("%pB: bad symbol index: %d"), 1530 abfd, r_symndx); 1531 goto error_return; 1532 } 1533 1534 if (r_symndx < symtab_hdr->sh_info) 1535 { 1536 /* A local symbol. */ 1537 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1538 abfd, r_symndx); 1539 if (isym == NULL) 1540 goto error_return; 1541 1542 /* Check relocation against local STT_GNU_IFUNC symbol. */ 1543 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1544 { 1545 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE); 1546 if (h == NULL) 1547 goto error_return; 1548 1549 /* Fake a STT_GNU_IFUNC symbol. */ 1550 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr, 1551 isym, NULL); 1552 h->type = STT_GNU_IFUNC; 1553 h->def_regular = 1; 1554 h->ref_regular = 1; 1555 h->forced_local = 1; 1556 h->root.type = bfd_link_hash_defined; 1557 } 1558 else 1559 h = NULL; 1560 } 1561 else 1562 { 1563 isym = NULL; 1564 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1565 while (h->root.type == bfd_link_hash_indirect 1566 || h->root.type == bfd_link_hash_warning) 1567 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1568 } 1569 1570 eh = (struct elf_x86_link_hash_entry *) h; 1571 if (h != NULL) 1572 { 1573 if (r_type == R_386_GOTOFF) 1574 eh->gotoff_ref = 1; 1575 1576 /* It is referenced by a non-shared object. */ 1577 h->ref_regular = 1; 1578 } 1579 1580 if (r_type == R_386_GOT32X 1581 && (h == NULL || h->type != STT_GNU_IFUNC)) 1582 { 1583 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel; 1584 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents, 1585 &r_type, irel, h, 1586 &converted, info)) 1587 goto error_return; 1588 } 1589 1590 if (! elf_i386_tls_transition (info, abfd, sec, contents, 1591 symtab_hdr, sym_hashes, 1592 &r_type, GOT_UNKNOWN, 1593 rel, rel_end, h, r_symndx, FALSE)) 1594 goto error_return; 1595 1596 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */ 1597 if (h == htab->elf.hgot) 1598 htab->got_referenced = TRUE; 1599 1600 switch (r_type) 1601 { 1602 case R_386_TLS_LDM: 1603 htab->tls_ld_or_ldm_got.refcount = 1; 1604 goto create_got; 1605 1606 case R_386_PLT32: 1607 /* This symbol requires a procedure linkage table entry. We 1608 actually build the entry in adjust_dynamic_symbol, 1609 because this might be a case of linking PIC code which is 1610 never referenced by a dynamic object, in which case we 1611 don't need to generate a procedure linkage table entry 1612 after all. */ 1613 1614 /* If this is a local symbol, we resolve it directly without 1615 creating a procedure linkage table entry. */ 1616 if (h == NULL) 1617 continue; 1618 1619 eh->zero_undefweak &= 0x2; 1620 h->needs_plt = 1; 1621 h->plt.refcount = 1; 1622 break; 1623 1624 case R_386_SIZE32: 1625 size_reloc = TRUE; 1626 goto do_size; 1627 1628 case R_386_TLS_IE_32: 1629 case R_386_TLS_IE: 1630 case R_386_TLS_GOTIE: 1631 if (!bfd_link_executable (info)) 1632 info->flags |= DF_STATIC_TLS; 1633 /* Fall through */ 1634 1635 case R_386_GOT32: 1636 case R_386_GOT32X: 1637 case R_386_TLS_GD: 1638 case R_386_TLS_GOTDESC: 1639 case R_386_TLS_DESC_CALL: 1640 /* This symbol requires a global offset table entry. */ 1641 { 1642 int tls_type, old_tls_type; 1643 1644 switch (r_type) 1645 { 1646 default: 1647 case R_386_GOT32: 1648 case R_386_GOT32X: 1649 tls_type = GOT_NORMAL; 1650 break; 1651 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; 1652 case R_386_TLS_GOTDESC: 1653 case R_386_TLS_DESC_CALL: 1654 tls_type = GOT_TLS_GDESC; break; 1655 case R_386_TLS_IE_32: 1656 if (ELF32_R_TYPE (rel->r_info) == r_type) 1657 tls_type = GOT_TLS_IE_NEG; 1658 else 1659 /* If this is a GD->IE transition, we may use either of 1660 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ 1661 tls_type = GOT_TLS_IE; 1662 break; 1663 case R_386_TLS_IE: 1664 case R_386_TLS_GOTIE: 1665 tls_type = GOT_TLS_IE_POS; break; 1666 } 1667 1668 if (h != NULL) 1669 { 1670 h->got.refcount = 1; 1671 old_tls_type = elf_x86_hash_entry (h)->tls_type; 1672 } 1673 else 1674 { 1675 bfd_signed_vma *local_got_refcounts; 1676 1677 /* This is a global offset table entry for a local symbol. */ 1678 local_got_refcounts = elf_local_got_refcounts (abfd); 1679 if (local_got_refcounts == NULL) 1680 { 1681 bfd_size_type size; 1682 1683 size = symtab_hdr->sh_info; 1684 size *= (sizeof (bfd_signed_vma) 1685 + sizeof (bfd_vma) + sizeof(char)); 1686 local_got_refcounts = (bfd_signed_vma *) 1687 bfd_zalloc (abfd, size); 1688 if (local_got_refcounts == NULL) 1689 goto error_return; 1690 elf_local_got_refcounts (abfd) = local_got_refcounts; 1691 elf_x86_local_tlsdesc_gotent (abfd) 1692 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); 1693 elf_x86_local_got_tls_type (abfd) 1694 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); 1695 } 1696 local_got_refcounts[r_symndx] = 1; 1697 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx]; 1698 } 1699 1700 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) 1701 tls_type |= old_tls_type; 1702 /* If a TLS symbol is accessed using IE at least once, 1703 there is no point to use dynamic model for it. */ 1704 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN 1705 && (! GOT_TLS_GD_ANY_P (old_tls_type) 1706 || (tls_type & GOT_TLS_IE) == 0)) 1707 { 1708 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type)) 1709 tls_type = old_tls_type; 1710 else if (GOT_TLS_GD_ANY_P (old_tls_type) 1711 && GOT_TLS_GD_ANY_P (tls_type)) 1712 tls_type |= old_tls_type; 1713 else 1714 { 1715 if (h) 1716 name = h->root.root.string; 1717 else 1718 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, 1719 NULL); 1720 _bfd_error_handler 1721 /* xgettext:c-format */ 1722 (_("%pB: `%s' accessed both as normal and " 1723 "thread local symbol"), 1724 abfd, name); 1725 bfd_set_error (bfd_error_bad_value); 1726 goto error_return; 1727 } 1728 } 1729 1730 if (old_tls_type != tls_type) 1731 { 1732 if (h != NULL) 1733 elf_x86_hash_entry (h)->tls_type = tls_type; 1734 else 1735 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type; 1736 } 1737 } 1738 /* Fall through */ 1739 1740 case R_386_GOTOFF: 1741 case R_386_GOTPC: 1742 create_got: 1743 if (r_type != R_386_TLS_IE) 1744 { 1745 if (eh != NULL) 1746 { 1747 eh->zero_undefweak &= 0x2; 1748 1749 /* Need GOT to resolve undefined weak symbol to 0. */ 1750 if (r_type == R_386_GOTOFF 1751 && h->root.type == bfd_link_hash_undefweak 1752 && bfd_link_executable (info)) 1753 htab->got_referenced = TRUE; 1754 } 1755 break; 1756 } 1757 /* Fall through */ 1758 1759 case R_386_TLS_LE_32: 1760 case R_386_TLS_LE: 1761 if (eh != NULL) 1762 eh->zero_undefweak &= 0x2; 1763 if (bfd_link_executable (info)) 1764 break; 1765 info->flags |= DF_STATIC_TLS; 1766 goto do_relocation; 1767 1768 case R_386_32: 1769 case R_386_PC32: 1770 if (eh != NULL && (sec->flags & SEC_CODE) != 0) 1771 eh->zero_undefweak |= 0x2; 1772 do_relocation: 1773 /* We are called after all symbols have been resolved. Only 1774 relocation against STT_GNU_IFUNC symbol must go through 1775 PLT. */ 1776 if (h != NULL 1777 && (bfd_link_executable (info) 1778 || h->type == STT_GNU_IFUNC)) 1779 { 1780 bfd_boolean func_pointer_ref = FALSE; 1781 1782 if (r_type == R_386_PC32) 1783 { 1784 /* Since something like ".long foo - ." may be used 1785 as pointer, make sure that PLT is used if foo is 1786 a function defined in a shared library. */ 1787 if ((sec->flags & SEC_CODE) == 0) 1788 h->pointer_equality_needed = 1; 1789 else if (h->type == STT_GNU_IFUNC 1790 && bfd_link_pic (info)) 1791 { 1792 _bfd_error_handler 1793 /* xgettext:c-format */ 1794 (_("%pB: unsupported non-PIC call to IFUNC `%s'"), 1795 abfd, h->root.root.string); 1796 bfd_set_error (bfd_error_bad_value); 1797 goto error_return; 1798 } 1799 } 1800 else 1801 { 1802 h->pointer_equality_needed = 1; 1803 /* R_386_32 can be resolved at run-time. */ 1804 if (r_type == R_386_32 1805 && (sec->flags & SEC_READONLY) == 0) 1806 func_pointer_ref = TRUE; 1807 } 1808 1809 if (!func_pointer_ref) 1810 { 1811 /* If this reloc is in a read-only section, we might 1812 need a copy reloc. We can't check reliably at this 1813 stage whether the section is read-only, as input 1814 sections have not yet been mapped to output sections. 1815 Tentatively set the flag for now, and correct in 1816 adjust_dynamic_symbol. */ 1817 h->non_got_ref = 1; 1818 1819 /* We may need a .plt entry if the symbol is a function 1820 defined in a shared lib or is a function referenced 1821 from the code or read-only section. */ 1822 if (!h->def_regular 1823 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0) 1824 h->plt.refcount = 1; 1825 } 1826 } 1827 1828 size_reloc = FALSE; 1829 do_size: 1830 if (NEED_DYNAMIC_RELOCATION_P (info, FALSE, h, sec, r_type, 1831 R_386_32)) 1832 { 1833 struct elf_dyn_relocs *p; 1834 struct elf_dyn_relocs **head; 1835 1836 /* We must copy these reloc types into the output file. 1837 Create a reloc section in dynobj and make room for 1838 this reloc. */ 1839 if (sreloc == NULL) 1840 { 1841 sreloc = _bfd_elf_make_dynamic_reloc_section 1842 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE); 1843 1844 if (sreloc == NULL) 1845 goto error_return; 1846 } 1847 1848 /* If this is a global symbol, we count the number of 1849 relocations we need for this symbol. */ 1850 if (h != NULL) 1851 { 1852 head = &eh->dyn_relocs; 1853 } 1854 else 1855 { 1856 /* Track dynamic relocs needed for local syms too. 1857 We really need local syms available to do this 1858 easily. Oh well. */ 1859 void **vpp; 1860 asection *s; 1861 1862 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1863 abfd, r_symndx); 1864 if (isym == NULL) 1865 goto error_return; 1866 1867 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 1868 if (s == NULL) 1869 s = sec; 1870 1871 vpp = &elf_section_data (s)->local_dynrel; 1872 head = (struct elf_dyn_relocs **)vpp; 1873 } 1874 1875 p = *head; 1876 if (p == NULL || p->sec != sec) 1877 { 1878 bfd_size_type amt = sizeof *p; 1879 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj, 1880 amt); 1881 if (p == NULL) 1882 goto error_return; 1883 p->next = *head; 1884 *head = p; 1885 p->sec = sec; 1886 p->count = 0; 1887 p->pc_count = 0; 1888 } 1889 1890 p->count += 1; 1891 /* Count size relocation as PC-relative relocation. */ 1892 if (r_type == R_386_PC32 || size_reloc) 1893 p->pc_count += 1; 1894 } 1895 break; 1896 1897 /* This relocation describes the C++ object vtable hierarchy. 1898 Reconstruct it for later use during GC. */ 1899 case R_386_GNU_VTINHERIT: 1900 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1901 goto error_return; 1902 break; 1903 1904 /* This relocation describes which C++ vtable entries are actually 1905 used. Record for later use during GC. */ 1906 case R_386_GNU_VTENTRY: 1907 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 1908 goto error_return; 1909 break; 1910 1911 default: 1912 break; 1913 } 1914 } 1915 1916 if (elf_section_data (sec)->this_hdr.contents != contents) 1917 { 1918 if (!converted && !info->keep_memory) 1919 free (contents); 1920 else 1921 { 1922 /* Cache the section contents for elf_link_input_bfd if any 1923 load is converted or --no-keep-memory isn't used. */ 1924 elf_section_data (sec)->this_hdr.contents = contents; 1925 } 1926 } 1927 1928 /* Cache relocations if any load is converted. */ 1929 if (elf_section_data (sec)->relocs != relocs && converted) 1930 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs; 1931 1932 return TRUE; 1933 1934 error_return: 1935 if (elf_section_data (sec)->this_hdr.contents != contents) 1936 free (contents); 1937 sec->check_relocs_failed = 1; 1938 return FALSE; 1939 } 1940 1941 /* Set the correct type for an x86 ELF section. We do this by the 1942 section name, which is a hack, but ought to work. */ 1943 1944 static bfd_boolean 1945 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, 1946 Elf_Internal_Shdr *hdr, 1947 asection *sec) 1948 { 1949 const char *name; 1950 1951 name = bfd_section_name (sec); 1952 1953 /* This is an ugly, but unfortunately necessary hack that is 1954 needed when producing EFI binaries on x86. It tells 1955 elf.c:elf_fake_sections() not to consider ".reloc" as a section 1956 containing ELF relocation info. We need this hack in order to 1957 be able to generate ELF binaries that can be translated into 1958 EFI applications (which are essentially COFF objects). Those 1959 files contain a COFF ".reloc" section inside an ELFNN object, 1960 which would normally cause BFD to segfault because it would 1961 attempt to interpret this section as containing relocation 1962 entries for section "oc". With this hack enabled, ".reloc" 1963 will be treated as a normal data section, which will avoid the 1964 segfault. However, you won't be able to create an ELFNN binary 1965 with a section named "oc" that needs relocations, but that's 1966 the kind of ugly side-effects you get when detecting section 1967 types based on their names... In practice, this limitation is 1968 unlikely to bite. */ 1969 if (strcmp (name, ".reloc") == 0) 1970 hdr->sh_type = SHT_PROGBITS; 1971 1972 return TRUE; 1973 } 1974 1975 /* Return the relocation value for @tpoff relocation 1976 if STT_TLS virtual address is ADDRESS. */ 1977 1978 static bfd_vma 1979 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address) 1980 { 1981 struct elf_link_hash_table *htab = elf_hash_table (info); 1982 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); 1983 bfd_vma static_tls_size; 1984 1985 /* If tls_sec is NULL, we should have signalled an error already. */ 1986 if (htab->tls_sec == NULL) 1987 return 0; 1988 1989 /* Consider special static TLS alignment requirements. */ 1990 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); 1991 return static_tls_size + htab->tls_sec->vma - address; 1992 } 1993 1994 /* Relocate an i386 ELF section. */ 1995 1996 static bfd_boolean 1997 elf_i386_relocate_section (bfd *output_bfd, 1998 struct bfd_link_info *info, 1999 bfd *input_bfd, 2000 asection *input_section, 2001 bfd_byte *contents, 2002 Elf_Internal_Rela *relocs, 2003 Elf_Internal_Sym *local_syms, 2004 asection **local_sections) 2005 { 2006 struct elf_x86_link_hash_table *htab; 2007 Elf_Internal_Shdr *symtab_hdr; 2008 struct elf_link_hash_entry **sym_hashes; 2009 bfd_vma *local_got_offsets; 2010 bfd_vma *local_tlsdesc_gotents; 2011 Elf_Internal_Rela *rel; 2012 Elf_Internal_Rela *wrel; 2013 Elf_Internal_Rela *relend; 2014 bfd_boolean is_vxworks_tls; 2015 unsigned plt_entry_size; 2016 2017 /* Skip if check_relocs failed. */ 2018 if (input_section->check_relocs_failed) 2019 return FALSE; 2020 2021 htab = elf_x86_hash_table (info, I386_ELF_DATA); 2022 if (htab == NULL) 2023 return FALSE; 2024 2025 if (!is_x86_elf (input_bfd, htab)) 2026 { 2027 bfd_set_error (bfd_error_wrong_format); 2028 return FALSE; 2029 } 2030 2031 symtab_hdr = &elf_symtab_hdr (input_bfd); 2032 sym_hashes = elf_sym_hashes (input_bfd); 2033 local_got_offsets = elf_local_got_offsets (input_bfd); 2034 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd); 2035 /* We have to handle relocations in vxworks .tls_vars sections 2036 specially, because the dynamic loader is 'weird'. */ 2037 is_vxworks_tls = (htab->target_os == is_vxworks 2038 && bfd_link_pic (info) 2039 && !strcmp (input_section->output_section->name, 2040 ".tls_vars")); 2041 2042 _bfd_x86_elf_set_tls_module_base (info); 2043 2044 plt_entry_size = htab->plt.plt_entry_size; 2045 2046 rel = wrel = relocs; 2047 relend = relocs + input_section->reloc_count; 2048 for (; rel < relend; wrel++, rel++) 2049 { 2050 unsigned int r_type, r_type_tls; 2051 reloc_howto_type *howto; 2052 unsigned long r_symndx; 2053 struct elf_link_hash_entry *h; 2054 struct elf_x86_link_hash_entry *eh; 2055 Elf_Internal_Sym *sym; 2056 asection *sec; 2057 bfd_vma off, offplt, plt_offset; 2058 bfd_vma relocation; 2059 bfd_boolean unresolved_reloc; 2060 bfd_reloc_status_type r; 2061 unsigned int indx; 2062 int tls_type; 2063 bfd_vma st_size; 2064 asection *resolved_plt; 2065 bfd_boolean resolved_to_zero; 2066 bfd_boolean relative_reloc; 2067 2068 r_type = ELF32_R_TYPE (rel->r_info); 2069 if (r_type == R_386_GNU_VTINHERIT 2070 || r_type == R_386_GNU_VTENTRY) 2071 { 2072 if (wrel != rel) 2073 *wrel = *rel; 2074 continue; 2075 } 2076 2077 howto = elf_i386_rtype_to_howto (r_type); 2078 if (howto == NULL) 2079 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type); 2080 2081 r_symndx = ELF32_R_SYM (rel->r_info); 2082 h = NULL; 2083 sym = NULL; 2084 sec = NULL; 2085 unresolved_reloc = FALSE; 2086 if (r_symndx < symtab_hdr->sh_info) 2087 { 2088 sym = local_syms + r_symndx; 2089 sec = local_sections[r_symndx]; 2090 relocation = (sec->output_section->vma 2091 + sec->output_offset 2092 + sym->st_value); 2093 st_size = sym->st_size; 2094 2095 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION 2096 && ((sec->flags & SEC_MERGE) != 0 2097 || (bfd_link_relocatable (info) 2098 && sec->output_offset != 0))) 2099 { 2100 bfd_vma addend; 2101 bfd_byte *where = contents + rel->r_offset; 2102 2103 switch (howto->size) 2104 { 2105 case 0: 2106 addend = bfd_get_8 (input_bfd, where); 2107 if (howto->pc_relative) 2108 { 2109 addend = (addend ^ 0x80) - 0x80; 2110 addend += 1; 2111 } 2112 break; 2113 case 1: 2114 addend = bfd_get_16 (input_bfd, where); 2115 if (howto->pc_relative) 2116 { 2117 addend = (addend ^ 0x8000) - 0x8000; 2118 addend += 2; 2119 } 2120 break; 2121 case 2: 2122 addend = bfd_get_32 (input_bfd, where); 2123 if (howto->pc_relative) 2124 { 2125 addend = (addend ^ 0x80000000) - 0x80000000; 2126 addend += 4; 2127 } 2128 break; 2129 default: 2130 abort (); 2131 } 2132 2133 if (bfd_link_relocatable (info)) 2134 addend += sec->output_offset; 2135 else 2136 { 2137 asection *msec = sec; 2138 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, 2139 addend); 2140 addend -= relocation; 2141 addend += msec->output_section->vma + msec->output_offset; 2142 } 2143 2144 switch (howto->size) 2145 { 2146 case 0: 2147 /* FIXME: overflow checks. */ 2148 if (howto->pc_relative) 2149 addend -= 1; 2150 bfd_put_8 (input_bfd, addend, where); 2151 break; 2152 case 1: 2153 if (howto->pc_relative) 2154 addend -= 2; 2155 bfd_put_16 (input_bfd, addend, where); 2156 break; 2157 case 2: 2158 if (howto->pc_relative) 2159 addend -= 4; 2160 bfd_put_32 (input_bfd, addend, where); 2161 break; 2162 } 2163 } 2164 else if (!bfd_link_relocatable (info) 2165 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 2166 { 2167 /* Relocate against local STT_GNU_IFUNC symbol. */ 2168 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel, 2169 FALSE); 2170 if (h == NULL) 2171 abort (); 2172 2173 /* Set STT_GNU_IFUNC symbol value. */ 2174 h->root.u.def.value = sym->st_value; 2175 h->root.u.def.section = sec; 2176 } 2177 } 2178 else 2179 { 2180 bfd_boolean warned ATTRIBUTE_UNUSED; 2181 bfd_boolean ignored ATTRIBUTE_UNUSED; 2182 2183 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2184 r_symndx, symtab_hdr, sym_hashes, 2185 h, sec, relocation, 2186 unresolved_reloc, warned, ignored); 2187 st_size = h->size; 2188 } 2189 2190 if (sec != NULL && discarded_section (sec)) 2191 { 2192 _bfd_clear_contents (howto, input_bfd, input_section, 2193 contents, rel->r_offset); 2194 wrel->r_offset = rel->r_offset; 2195 wrel->r_info = 0; 2196 wrel->r_addend = 0; 2197 2198 /* For ld -r, remove relocations in debug sections against 2199 sections defined in discarded sections. Not done for 2200 eh_frame editing code expects to be present. */ 2201 if (bfd_link_relocatable (info) 2202 && (input_section->flags & SEC_DEBUGGING)) 2203 wrel--; 2204 2205 continue; 2206 } 2207 2208 if (bfd_link_relocatable (info)) 2209 { 2210 if (wrel != rel) 2211 *wrel = *rel; 2212 continue; 2213 } 2214 2215 eh = (struct elf_x86_link_hash_entry *) h; 2216 2217 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle 2218 it here if it is defined in a non-shared object. */ 2219 if (h != NULL 2220 && h->type == STT_GNU_IFUNC 2221 && h->def_regular) 2222 { 2223 asection *gotplt, *base_got; 2224 bfd_vma plt_index; 2225 const char *name; 2226 2227 if ((input_section->flags & SEC_ALLOC) == 0) 2228 { 2229 /* If this is a SHT_NOTE section without SHF_ALLOC, treat 2230 STT_GNU_IFUNC symbol as STT_FUNC. */ 2231 if (elf_section_type (input_section) == SHT_NOTE) 2232 goto skip_ifunc; 2233 /* Dynamic relocs are not propagated for SEC_DEBUGGING 2234 sections because such sections are not SEC_ALLOC and 2235 thus ld.so will not process them. */ 2236 if ((input_section->flags & SEC_DEBUGGING) != 0) 2237 continue; 2238 abort (); 2239 } 2240 2241 /* STT_GNU_IFUNC symbol must go through PLT. */ 2242 if (htab->elf.splt != NULL) 2243 { 2244 if (htab->plt_second != NULL) 2245 { 2246 resolved_plt = htab->plt_second; 2247 plt_offset = eh->plt_second.offset; 2248 } 2249 else 2250 { 2251 resolved_plt = htab->elf.splt; 2252 plt_offset = h->plt.offset; 2253 } 2254 gotplt = htab->elf.sgotplt; 2255 } 2256 else 2257 { 2258 resolved_plt = htab->elf.iplt; 2259 plt_offset = h->plt.offset; 2260 gotplt = htab->elf.igotplt; 2261 } 2262 2263 switch (r_type) 2264 { 2265 default: 2266 break; 2267 2268 case R_386_GOT32: 2269 case R_386_GOT32X: 2270 base_got = htab->elf.sgot; 2271 off = h->got.offset; 2272 2273 if (base_got == NULL) 2274 abort (); 2275 2276 if (off == (bfd_vma) -1) 2277 { 2278 /* We can't use h->got.offset here to save state, or 2279 even just remember the offset, as finish_dynamic_symbol 2280 would use that as offset into .got. */ 2281 2282 if (h->plt.offset == (bfd_vma) -1) 2283 abort (); 2284 2285 if (htab->elf.splt != NULL) 2286 { 2287 plt_index = (h->plt.offset / plt_entry_size 2288 - htab->plt.has_plt0); 2289 off = (plt_index + 3) * 4; 2290 base_got = htab->elf.sgotplt; 2291 } 2292 else 2293 { 2294 plt_index = h->plt.offset / plt_entry_size; 2295 off = plt_index * 4; 2296 base_got = htab->elf.igotplt; 2297 } 2298 2299 if (h->dynindx == -1 2300 || h->forced_local 2301 || info->symbolic) 2302 { 2303 /* This references the local defitionion. We must 2304 initialize this entry in the global offset table. 2305 Since the offset must always be a multiple of 8, 2306 we use the least significant bit to record 2307 whether we have initialized it already. 2308 2309 When doing a dynamic link, we create a .rela.got 2310 relocation entry to initialize the value. This 2311 is done in the finish_dynamic_symbol routine. */ 2312 if ((off & 1) != 0) 2313 off &= ~1; 2314 else 2315 { 2316 bfd_put_32 (output_bfd, relocation, 2317 base_got->contents + off); 2318 h->got.offset |= 1; 2319 } 2320 } 2321 2322 relocation = off; 2323 } 2324 else 2325 relocation = (base_got->output_section->vma 2326 + base_got->output_offset + off 2327 - gotplt->output_section->vma 2328 - gotplt->output_offset); 2329 2330 if (rel->r_offset > 1 2331 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5 2332 && *(contents + rel->r_offset - 2) != 0x8d) 2333 { 2334 if (bfd_link_pic (info)) 2335 goto disallow_got32; 2336 2337 /* Add the GOT base if there is no base register. */ 2338 relocation += (gotplt->output_section->vma 2339 + gotplt->output_offset); 2340 } 2341 else if (htab->elf.splt == NULL) 2342 { 2343 /* Adjust for static executables. */ 2344 relocation += gotplt->output_offset; 2345 } 2346 2347 goto do_relocation; 2348 } 2349 2350 if (h->plt.offset == (bfd_vma) -1) 2351 { 2352 /* Handle static pointers of STT_GNU_IFUNC symbols. */ 2353 if (r_type == R_386_32 2354 && (input_section->flags & SEC_CODE) == 0) 2355 goto do_ifunc_pointer; 2356 goto bad_ifunc_reloc; 2357 } 2358 2359 relocation = (resolved_plt->output_section->vma 2360 + resolved_plt->output_offset + plt_offset); 2361 2362 switch (r_type) 2363 { 2364 default: 2365 bad_ifunc_reloc: 2366 if (h->root.root.string) 2367 name = h->root.root.string; 2368 else 2369 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, 2370 NULL); 2371 _bfd_error_handler 2372 /* xgettext:c-format */ 2373 (_("%pB: relocation %s against STT_GNU_IFUNC " 2374 "symbol `%s' isn't supported"), input_bfd, 2375 howto->name, name); 2376 bfd_set_error (bfd_error_bad_value); 2377 return FALSE; 2378 2379 case R_386_32: 2380 /* Generate dynamic relcoation only when there is a 2381 non-GOT reference in a shared object. */ 2382 if ((bfd_link_pic (info) && h->non_got_ref) 2383 || h->plt.offset == (bfd_vma) -1) 2384 { 2385 Elf_Internal_Rela outrel; 2386 asection *sreloc; 2387 bfd_vma offset; 2388 2389 do_ifunc_pointer: 2390 /* Need a dynamic relocation to get the real function 2391 adddress. */ 2392 offset = _bfd_elf_section_offset (output_bfd, 2393 info, 2394 input_section, 2395 rel->r_offset); 2396 if (offset == (bfd_vma) -1 2397 || offset == (bfd_vma) -2) 2398 abort (); 2399 2400 outrel.r_offset = (input_section->output_section->vma 2401 + input_section->output_offset 2402 + offset); 2403 2404 if (POINTER_LOCAL_IFUNC_P (info, h)) 2405 { 2406 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 2407 h->root.root.string, 2408 h->root.u.def.section->owner); 2409 2410 /* This symbol is resolved locally. */ 2411 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); 2412 bfd_put_32 (output_bfd, 2413 (h->root.u.def.value 2414 + h->root.u.def.section->output_section->vma 2415 + h->root.u.def.section->output_offset), 2416 contents + offset); 2417 } 2418 else 2419 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2420 2421 /* Dynamic relocations are stored in 2422 1. .rel.ifunc section in PIC object. 2423 2. .rel.got section in dynamic executable. 2424 3. .rel.iplt section in static executable. */ 2425 if (bfd_link_pic (info)) 2426 sreloc = htab->elf.irelifunc; 2427 else if (htab->elf.splt != NULL) 2428 sreloc = htab->elf.srelgot; 2429 else 2430 sreloc = htab->elf.irelplt; 2431 elf_append_rel (output_bfd, sreloc, &outrel); 2432 2433 /* If this reloc is against an external symbol, we 2434 do not want to fiddle with the addend. Otherwise, 2435 we need to include the symbol value so that it 2436 becomes an addend for the dynamic reloc. For an 2437 internal symbol, we have updated addend. */ 2438 continue; 2439 } 2440 /* FALLTHROUGH */ 2441 case R_386_PC32: 2442 case R_386_PLT32: 2443 goto do_relocation; 2444 2445 case R_386_GOTOFF: 2446 relocation -= (gotplt->output_section->vma 2447 + gotplt->output_offset); 2448 goto do_relocation; 2449 } 2450 } 2451 2452 skip_ifunc: 2453 resolved_to_zero = (eh != NULL 2454 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh)); 2455 2456 switch (r_type) 2457 { 2458 case R_386_GOT32X: 2459 case R_386_GOT32: 2460 /* Relocation is to the entry for this symbol in the global 2461 offset table. */ 2462 if (htab->elf.sgot == NULL) 2463 abort (); 2464 2465 relative_reloc = FALSE; 2466 if (h != NULL) 2467 { 2468 off = h->got.offset; 2469 if (RESOLVED_LOCALLY_P (info, h, htab)) 2470 { 2471 /* We must initialize this entry in the global offset 2472 table. Since the offset must always be a multiple 2473 of 4, we use the least significant bit to record 2474 whether we have initialized it already. 2475 2476 When doing a dynamic link, we create a .rel.got 2477 relocation entry to initialize the value. This 2478 is done in the finish_dynamic_symbol routine. */ 2479 if ((off & 1) != 0) 2480 off &= ~1; 2481 else 2482 { 2483 bfd_put_32 (output_bfd, relocation, 2484 htab->elf.sgot->contents + off); 2485 h->got.offset |= 1; 2486 2487 if (GENERATE_RELATIVE_RELOC_P (info, h)) 2488 { 2489 /* PR ld/21402: If this symbol isn't dynamic 2490 in PIC, generate R_386_RELATIVE here. */ 2491 eh->no_finish_dynamic_symbol = 1; 2492 relative_reloc = TRUE; 2493 } 2494 } 2495 } 2496 else 2497 unresolved_reloc = FALSE; 2498 } 2499 else 2500 { 2501 if (local_got_offsets == NULL) 2502 abort (); 2503 2504 off = local_got_offsets[r_symndx]; 2505 2506 /* The offset must always be a multiple of 4. We use 2507 the least significant bit to record whether we have 2508 already generated the necessary reloc. */ 2509 if ((off & 1) != 0) 2510 off &= ~1; 2511 else 2512 { 2513 bfd_put_32 (output_bfd, relocation, 2514 htab->elf.sgot->contents + off); 2515 local_got_offsets[r_symndx] |= 1; 2516 2517 if (bfd_link_pic (info)) 2518 relative_reloc = TRUE; 2519 } 2520 } 2521 2522 if (relative_reloc) 2523 { 2524 asection *s; 2525 Elf_Internal_Rela outrel; 2526 2527 s = htab->elf.srelgot; 2528 if (s == NULL) 2529 abort (); 2530 2531 outrel.r_offset = (htab->elf.sgot->output_section->vma 2532 + htab->elf.sgot->output_offset 2533 + off); 2534 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2535 elf_append_rel (output_bfd, s, &outrel); 2536 } 2537 2538 if (off >= (bfd_vma) -2) 2539 abort (); 2540 2541 relocation = (htab->elf.sgot->output_section->vma 2542 + htab->elf.sgot->output_offset + off); 2543 if (rel->r_offset > 1 2544 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5 2545 && *(contents + rel->r_offset - 2) != 0x8d) 2546 { 2547 if (bfd_link_pic (info)) 2548 { 2549 /* For PIC, disallow R_386_GOT32 without a base 2550 register, except for "lea foo@GOT, %reg", since 2551 we don't know what the GOT base is. */ 2552 const char *name; 2553 2554 disallow_got32: 2555 if (h == NULL || h->root.root.string == NULL) 2556 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, 2557 NULL); 2558 else 2559 name = h->root.root.string; 2560 2561 _bfd_error_handler 2562 /* xgettext:c-format */ 2563 (_("%pB: direct GOT relocation %s against `%s'" 2564 " without base register can not be used" 2565 " when making a shared object"), 2566 input_bfd, howto->name, name); 2567 bfd_set_error (bfd_error_bad_value); 2568 return FALSE; 2569 } 2570 } 2571 else 2572 { 2573 /* Subtract the .got.plt section address only with a base 2574 register. */ 2575 relocation -= (htab->elf.sgotplt->output_section->vma 2576 + htab->elf.sgotplt->output_offset); 2577 } 2578 2579 break; 2580 2581 case R_386_GOTOFF: 2582 /* Relocation is relative to the start of the global offset 2583 table. */ 2584 2585 /* Check to make sure it isn't a protected function or data 2586 symbol for shared library since it may not be local when 2587 used as function address or with copy relocation. We also 2588 need to make sure that a symbol is referenced locally. */ 2589 if (!bfd_link_executable (info) && h) 2590 { 2591 if (!h->def_regular) 2592 { 2593 const char *v; 2594 2595 switch (ELF_ST_VISIBILITY (h->other)) 2596 { 2597 case STV_HIDDEN: 2598 v = _("hidden symbol"); 2599 break; 2600 case STV_INTERNAL: 2601 v = _("internal symbol"); 2602 break; 2603 case STV_PROTECTED: 2604 v = _("protected symbol"); 2605 break; 2606 default: 2607 v = _("symbol"); 2608 break; 2609 } 2610 2611 _bfd_error_handler 2612 /* xgettext:c-format */ 2613 (_("%pB: relocation R_386_GOTOFF against undefined %s" 2614 " `%s' can not be used when making a shared object"), 2615 input_bfd, v, h->root.root.string); 2616 bfd_set_error (bfd_error_bad_value); 2617 return FALSE; 2618 } 2619 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h) 2620 && (h->type == STT_FUNC 2621 || h->type == STT_OBJECT) 2622 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) 2623 { 2624 _bfd_error_handler 2625 /* xgettext:c-format */ 2626 (_("%pB: relocation R_386_GOTOFF against protected %s" 2627 " `%s' can not be used when making a shared object"), 2628 input_bfd, 2629 h->type == STT_FUNC ? "function" : "data", 2630 h->root.root.string); 2631 bfd_set_error (bfd_error_bad_value); 2632 return FALSE; 2633 } 2634 } 2635 2636 /* Note that sgot is not involved in this 2637 calculation. We always want the start of .got.plt. If we 2638 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is 2639 permitted by the ABI, we might have to change this 2640 calculation. */ 2641 relocation -= htab->elf.sgotplt->output_section->vma 2642 + htab->elf.sgotplt->output_offset; 2643 break; 2644 2645 case R_386_GOTPC: 2646 /* Use global offset table as symbol value. */ 2647 relocation = htab->elf.sgotplt->output_section->vma 2648 + htab->elf.sgotplt->output_offset; 2649 unresolved_reloc = FALSE; 2650 break; 2651 2652 case R_386_PLT32: 2653 /* Relocation is to the entry for this symbol in the 2654 procedure linkage table. */ 2655 2656 /* Resolve a PLT32 reloc against a local symbol directly, 2657 without using the procedure linkage table. */ 2658 if (h == NULL) 2659 break; 2660 2661 if ((h->plt.offset == (bfd_vma) -1 2662 && eh->plt_got.offset == (bfd_vma) -1) 2663 || htab->elf.splt == NULL) 2664 { 2665 /* We didn't make a PLT entry for this symbol. This 2666 happens when statically linking PIC code, or when 2667 using -Bsymbolic. */ 2668 break; 2669 } 2670 2671 if (h->plt.offset != (bfd_vma) -1) 2672 { 2673 if (htab->plt_second != NULL) 2674 { 2675 resolved_plt = htab->plt_second; 2676 plt_offset = eh->plt_second.offset; 2677 } 2678 else 2679 { 2680 resolved_plt = htab->elf.splt; 2681 plt_offset = h->plt.offset; 2682 } 2683 } 2684 else 2685 { 2686 resolved_plt = htab->plt_got; 2687 plt_offset = eh->plt_got.offset; 2688 } 2689 2690 relocation = (resolved_plt->output_section->vma 2691 + resolved_plt->output_offset 2692 + plt_offset); 2693 unresolved_reloc = FALSE; 2694 break; 2695 2696 case R_386_SIZE32: 2697 /* Set to symbol size. */ 2698 relocation = st_size; 2699 /* Fall through. */ 2700 2701 case R_386_32: 2702 case R_386_PC32: 2703 if ((input_section->flags & SEC_ALLOC) == 0 2704 || is_vxworks_tls) 2705 break; 2706 2707 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type, 2708 FALSE, resolved_to_zero, 2709 (r_type == R_386_PC32))) 2710 { 2711 Elf_Internal_Rela outrel; 2712 bfd_boolean skip, relocate; 2713 asection *sreloc; 2714 2715 /* When generating a shared object, these relocations 2716 are copied into the output file to be resolved at run 2717 time. */ 2718 2719 skip = FALSE; 2720 relocate = FALSE; 2721 2722 outrel.r_offset = 2723 _bfd_elf_section_offset (output_bfd, info, input_section, 2724 rel->r_offset); 2725 if (outrel.r_offset == (bfd_vma) -1) 2726 skip = TRUE; 2727 else if (outrel.r_offset == (bfd_vma) -2) 2728 skip = TRUE, relocate = TRUE; 2729 outrel.r_offset += (input_section->output_section->vma 2730 + input_section->output_offset); 2731 2732 if (skip) 2733 memset (&outrel, 0, sizeof outrel); 2734 else if (COPY_INPUT_RELOC_P (info, h, r_type)) 2735 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2736 else 2737 { 2738 /* This symbol is local, or marked to become local. */ 2739 relocate = TRUE; 2740 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2741 } 2742 2743 sreloc = elf_section_data (input_section)->sreloc; 2744 2745 if (sreloc == NULL || sreloc->contents == NULL) 2746 { 2747 r = bfd_reloc_notsupported; 2748 goto check_relocation_error; 2749 } 2750 2751 elf_append_rel (output_bfd, sreloc, &outrel); 2752 2753 /* If this reloc is against an external symbol, we do 2754 not want to fiddle with the addend. Otherwise, we 2755 need to include the symbol value so that it becomes 2756 an addend for the dynamic reloc. */ 2757 if (! relocate) 2758 continue; 2759 } 2760 break; 2761 2762 case R_386_TLS_IE: 2763 if (!bfd_link_executable (info)) 2764 { 2765 Elf_Internal_Rela outrel; 2766 asection *sreloc; 2767 2768 outrel.r_offset = rel->r_offset 2769 + input_section->output_section->vma 2770 + input_section->output_offset; 2771 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2772 sreloc = elf_section_data (input_section)->sreloc; 2773 if (sreloc == NULL) 2774 abort (); 2775 elf_append_rel (output_bfd, sreloc, &outrel); 2776 } 2777 /* Fall through */ 2778 2779 case R_386_TLS_GD: 2780 case R_386_TLS_GOTDESC: 2781 case R_386_TLS_DESC_CALL: 2782 case R_386_TLS_IE_32: 2783 case R_386_TLS_GOTIE: 2784 tls_type = GOT_UNKNOWN; 2785 if (h == NULL && local_got_offsets) 2786 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx]; 2787 else if (h != NULL) 2788 tls_type = elf_x86_hash_entry(h)->tls_type; 2789 if (tls_type == GOT_TLS_IE) 2790 tls_type = GOT_TLS_IE_NEG; 2791 2792 r_type_tls = r_type; 2793 if (! elf_i386_tls_transition (info, input_bfd, 2794 input_section, contents, 2795 symtab_hdr, sym_hashes, 2796 &r_type_tls, tls_type, rel, 2797 relend, h, r_symndx, TRUE)) 2798 return FALSE; 2799 2800 if (r_type_tls == R_386_TLS_LE_32) 2801 { 2802 BFD_ASSERT (! unresolved_reloc); 2803 if (r_type == R_386_TLS_GD) 2804 { 2805 unsigned int type; 2806 bfd_vma roff; 2807 2808 /* GD->LE transition. */ 2809 type = *(contents + rel->r_offset - 2); 2810 if (type == 0x04) 2811 { 2812 /* Change 2813 leal foo@tlsgd(,%ebx,1), %eax 2814 call ___tls_get_addr@PLT 2815 into: 2816 movl %gs:0, %eax 2817 subl $foo@tpoff, %eax 2818 (6 byte form of subl). */ 2819 roff = rel->r_offset + 5; 2820 } 2821 else 2822 { 2823 /* Change 2824 leal foo@tlsgd(%ebx), %eax 2825 call ___tls_get_addr@PLT 2826 nop 2827 or 2828 leal foo@tlsgd(%reg), %eax 2829 call *___tls_get_addr@GOT(%reg) 2830 which may be converted to 2831 addr32 call ___tls_get_addr 2832 into: 2833 movl %gs:0, %eax; subl $foo@tpoff, %eax 2834 (6 byte form of subl). */ 2835 roff = rel->r_offset + 6; 2836 } 2837 memcpy (contents + roff - 8, 2838 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); 2839 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), 2840 contents + roff); 2841 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */ 2842 rel++; 2843 wrel++; 2844 continue; 2845 } 2846 else if (r_type == R_386_TLS_GOTDESC) 2847 { 2848 /* GDesc -> LE transition. 2849 It's originally something like: 2850 leal x@tlsdesc(%ebx), %eax 2851 2852 leal x@ntpoff, %eax 2853 2854 Registers other than %eax may be set up here. */ 2855 2856 unsigned int val; 2857 bfd_vma roff; 2858 2859 roff = rel->r_offset; 2860 val = bfd_get_8 (input_bfd, contents + roff - 1); 2861 2862 /* Now modify the instruction as appropriate. */ 2863 /* aoliva FIXME: remove the above and xor the byte 2864 below with 0x86. */ 2865 bfd_put_8 (output_bfd, val ^ 0x86, 2866 contents + roff - 1); 2867 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 2868 contents + roff); 2869 continue; 2870 } 2871 else if (r_type == R_386_TLS_DESC_CALL) 2872 { 2873 /* GDesc -> LE transition. 2874 It's originally: 2875 call *(%eax) 2876 Turn it into: 2877 xchg %ax,%ax */ 2878 2879 bfd_vma roff; 2880 2881 roff = rel->r_offset; 2882 bfd_put_8 (output_bfd, 0x66, contents + roff); 2883 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 2884 continue; 2885 } 2886 else if (r_type == R_386_TLS_IE) 2887 { 2888 unsigned int val; 2889 2890 /* IE->LE transition: 2891 Originally it can be one of: 2892 movl foo, %eax 2893 movl foo, %reg 2894 addl foo, %reg 2895 We change it into: 2896 movl $foo, %eax 2897 movl $foo, %reg 2898 addl $foo, %reg. */ 2899 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2900 if (val == 0xa1) 2901 { 2902 /* movl foo, %eax. */ 2903 bfd_put_8 (output_bfd, 0xb8, 2904 contents + rel->r_offset - 1); 2905 } 2906 else 2907 { 2908 unsigned int type; 2909 2910 type = bfd_get_8 (input_bfd, 2911 contents + rel->r_offset - 2); 2912 switch (type) 2913 { 2914 case 0x8b: 2915 /* movl */ 2916 bfd_put_8 (output_bfd, 0xc7, 2917 contents + rel->r_offset - 2); 2918 bfd_put_8 (output_bfd, 2919 0xc0 | ((val >> 3) & 7), 2920 contents + rel->r_offset - 1); 2921 break; 2922 case 0x03: 2923 /* addl */ 2924 bfd_put_8 (output_bfd, 0x81, 2925 contents + rel->r_offset - 2); 2926 bfd_put_8 (output_bfd, 2927 0xc0 | ((val >> 3) & 7), 2928 contents + rel->r_offset - 1); 2929 break; 2930 default: 2931 BFD_FAIL (); 2932 break; 2933 } 2934 } 2935 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 2936 contents + rel->r_offset); 2937 continue; 2938 } 2939 else 2940 { 2941 unsigned int val, type; 2942 2943 /* {IE_32,GOTIE}->LE transition: 2944 Originally it can be one of: 2945 subl foo(%reg1), %reg2 2946 movl foo(%reg1), %reg2 2947 addl foo(%reg1), %reg2 2948 We change it into: 2949 subl $foo, %reg2 2950 movl $foo, %reg2 (6 byte form) 2951 addl $foo, %reg2. */ 2952 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 2953 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2954 if (type == 0x8b) 2955 { 2956 /* movl */ 2957 bfd_put_8 (output_bfd, 0xc7, 2958 contents + rel->r_offset - 2); 2959 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 2960 contents + rel->r_offset - 1); 2961 } 2962 else if (type == 0x2b) 2963 { 2964 /* subl */ 2965 bfd_put_8 (output_bfd, 0x81, 2966 contents + rel->r_offset - 2); 2967 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), 2968 contents + rel->r_offset - 1); 2969 } 2970 else if (type == 0x03) 2971 { 2972 /* addl */ 2973 bfd_put_8 (output_bfd, 0x81, 2974 contents + rel->r_offset - 2); 2975 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 2976 contents + rel->r_offset - 1); 2977 } 2978 else 2979 BFD_FAIL (); 2980 if (r_type == R_386_TLS_GOTIE) 2981 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 2982 contents + rel->r_offset); 2983 else 2984 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), 2985 contents + rel->r_offset); 2986 continue; 2987 } 2988 } 2989 2990 if (htab->elf.sgot == NULL) 2991 abort (); 2992 2993 if (h != NULL) 2994 { 2995 off = h->got.offset; 2996 offplt = elf_x86_hash_entry (h)->tlsdesc_got; 2997 } 2998 else 2999 { 3000 if (local_got_offsets == NULL) 3001 abort (); 3002 3003 off = local_got_offsets[r_symndx]; 3004 offplt = local_tlsdesc_gotents[r_symndx]; 3005 } 3006 3007 if ((off & 1) != 0) 3008 off &= ~1; 3009 else 3010 { 3011 Elf_Internal_Rela outrel; 3012 int dr_type; 3013 asection *sreloc; 3014 3015 if (htab->elf.srelgot == NULL) 3016 abort (); 3017 3018 indx = h && h->dynindx != -1 ? h->dynindx : 0; 3019 3020 if (GOT_TLS_GDESC_P (tls_type)) 3021 { 3022 bfd_byte *loc; 3023 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC); 3024 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8 3025 <= htab->elf.sgotplt->size); 3026 outrel.r_offset = (htab->elf.sgotplt->output_section->vma 3027 + htab->elf.sgotplt->output_offset 3028 + offplt 3029 + htab->sgotplt_jump_table_size); 3030 sreloc = htab->elf.srelplt; 3031 loc = sreloc->contents; 3032 loc += (htab->next_tls_desc_index++ 3033 * sizeof (Elf32_External_Rel)); 3034 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 3035 <= sreloc->contents + sreloc->size); 3036 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3037 if (indx == 0) 3038 { 3039 BFD_ASSERT (! unresolved_reloc); 3040 bfd_put_32 (output_bfd, 3041 relocation - _bfd_x86_elf_dtpoff_base (info), 3042 htab->elf.sgotplt->contents + offplt 3043 + htab->sgotplt_jump_table_size + 4); 3044 } 3045 else 3046 { 3047 bfd_put_32 (output_bfd, 0, 3048 htab->elf.sgotplt->contents + offplt 3049 + htab->sgotplt_jump_table_size + 4); 3050 } 3051 } 3052 3053 sreloc = htab->elf.srelgot; 3054 3055 outrel.r_offset = (htab->elf.sgot->output_section->vma 3056 + htab->elf.sgot->output_offset + off); 3057 3058 if (GOT_TLS_GD_P (tls_type)) 3059 dr_type = R_386_TLS_DTPMOD32; 3060 else if (GOT_TLS_GDESC_P (tls_type)) 3061 goto dr_done; 3062 else if (tls_type == GOT_TLS_IE_POS) 3063 dr_type = R_386_TLS_TPOFF; 3064 else 3065 dr_type = R_386_TLS_TPOFF32; 3066 3067 if (dr_type == R_386_TLS_TPOFF && indx == 0) 3068 bfd_put_32 (output_bfd, 3069 relocation - _bfd_x86_elf_dtpoff_base (info), 3070 htab->elf.sgot->contents + off); 3071 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) 3072 bfd_put_32 (output_bfd, 3073 _bfd_x86_elf_dtpoff_base (info) - relocation, 3074 htab->elf.sgot->contents + off); 3075 else if (dr_type != R_386_TLS_DESC) 3076 bfd_put_32 (output_bfd, 0, 3077 htab->elf.sgot->contents + off); 3078 outrel.r_info = ELF32_R_INFO (indx, dr_type); 3079 3080 elf_append_rel (output_bfd, sreloc, &outrel); 3081 3082 if (GOT_TLS_GD_P (tls_type)) 3083 { 3084 if (indx == 0) 3085 { 3086 BFD_ASSERT (! unresolved_reloc); 3087 bfd_put_32 (output_bfd, 3088 relocation - _bfd_x86_elf_dtpoff_base (info), 3089 htab->elf.sgot->contents + off + 4); 3090 } 3091 else 3092 { 3093 bfd_put_32 (output_bfd, 0, 3094 htab->elf.sgot->contents + off + 4); 3095 outrel.r_info = ELF32_R_INFO (indx, 3096 R_386_TLS_DTPOFF32); 3097 outrel.r_offset += 4; 3098 elf_append_rel (output_bfd, sreloc, &outrel); 3099 } 3100 } 3101 else if (tls_type == GOT_TLS_IE_BOTH) 3102 { 3103 bfd_put_32 (output_bfd, 3104 (indx == 0 3105 ? relocation - _bfd_x86_elf_dtpoff_base (info) 3106 : 0), 3107 htab->elf.sgot->contents + off + 4); 3108 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 3109 outrel.r_offset += 4; 3110 elf_append_rel (output_bfd, sreloc, &outrel); 3111 } 3112 3113 dr_done: 3114 if (h != NULL) 3115 h->got.offset |= 1; 3116 else 3117 local_got_offsets[r_symndx] |= 1; 3118 } 3119 3120 if (off >= (bfd_vma) -2 3121 && ! GOT_TLS_GDESC_P (tls_type)) 3122 abort (); 3123 if (r_type_tls == R_386_TLS_GOTDESC 3124 || r_type_tls == R_386_TLS_DESC_CALL) 3125 { 3126 relocation = htab->sgotplt_jump_table_size + offplt; 3127 unresolved_reloc = FALSE; 3128 } 3129 else if (r_type_tls == r_type) 3130 { 3131 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma 3132 + htab->elf.sgotplt->output_offset; 3133 relocation = htab->elf.sgot->output_section->vma 3134 + htab->elf.sgot->output_offset + off - g_o_t; 3135 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) 3136 && tls_type == GOT_TLS_IE_BOTH) 3137 relocation += 4; 3138 if (r_type == R_386_TLS_IE) 3139 relocation += g_o_t; 3140 unresolved_reloc = FALSE; 3141 } 3142 else if (r_type == R_386_TLS_GD) 3143 { 3144 unsigned int val, type; 3145 bfd_vma roff; 3146 3147 /* GD->IE transition. */ 3148 type = *(contents + rel->r_offset - 2); 3149 val = *(contents + rel->r_offset - 1); 3150 if (type == 0x04) 3151 { 3152 /* Change 3153 leal foo@tlsgd(,%ebx,1), %eax 3154 call ___tls_get_addr@PLT 3155 into: 3156 movl %gs:0, %eax 3157 subl $foo@gottpoff(%ebx), %eax. */ 3158 val >>= 3; 3159 roff = rel->r_offset - 3; 3160 } 3161 else 3162 { 3163 /* Change 3164 leal foo@tlsgd(%ebx), %eax 3165 call ___tls_get_addr@PLT 3166 nop 3167 or 3168 leal foo@tlsgd(%reg), %eax 3169 call *___tls_get_addr@GOT(%reg) 3170 which may be converted to 3171 addr32 call ___tls_get_addr 3172 into: 3173 movl %gs:0, %eax; 3174 subl $foo@gottpoff(%reg), %eax. */ 3175 roff = rel->r_offset - 2; 3176 } 3177 memcpy (contents + roff, 3178 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); 3179 contents[roff + 7] = 0x80 | (val & 7); 3180 /* If foo is used only with foo@gotntpoff(%reg) and 3181 foo@indntpoff, but not with foo@gottpoff(%reg), change 3182 subl $foo@gottpoff(%reg), %eax 3183 into: 3184 addl $foo@gotntpoff(%reg), %eax. */ 3185 if (tls_type == GOT_TLS_IE_POS) 3186 contents[roff + 6] = 0x03; 3187 bfd_put_32 (output_bfd, 3188 htab->elf.sgot->output_section->vma 3189 + htab->elf.sgot->output_offset + off 3190 - htab->elf.sgotplt->output_section->vma 3191 - htab->elf.sgotplt->output_offset, 3192 contents + roff + 8); 3193 /* Skip R_386_PLT32 and R_386_GOT32X. */ 3194 rel++; 3195 wrel++; 3196 continue; 3197 } 3198 else if (r_type == R_386_TLS_GOTDESC) 3199 { 3200 /* GDesc -> IE transition. 3201 It's originally something like: 3202 leal x@tlsdesc(%ebx), %eax 3203 3204 Change it to: 3205 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax 3206 or: 3207 movl x@gottpoff(%ebx), %eax # before negl %eax 3208 3209 Registers other than %eax may be set up here. */ 3210 3211 bfd_vma roff; 3212 3213 /* First, make sure it's a leal adding ebx to a 32-bit 3214 offset into any register, although it's probably 3215 almost always going to be eax. */ 3216 roff = rel->r_offset; 3217 3218 /* Now modify the instruction as appropriate. */ 3219 /* To turn a leal into a movl in the form we use it, it 3220 suffices to change the first byte from 0x8d to 0x8b. 3221 aoliva FIXME: should we decide to keep the leal, all 3222 we have to do is remove the statement below, and 3223 adjust the relaxation of R_386_TLS_DESC_CALL. */ 3224 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); 3225 3226 if (tls_type == GOT_TLS_IE_BOTH) 3227 off += 4; 3228 3229 bfd_put_32 (output_bfd, 3230 htab->elf.sgot->output_section->vma 3231 + htab->elf.sgot->output_offset + off 3232 - htab->elf.sgotplt->output_section->vma 3233 - htab->elf.sgotplt->output_offset, 3234 contents + roff); 3235 continue; 3236 } 3237 else if (r_type == R_386_TLS_DESC_CALL) 3238 { 3239 /* GDesc -> IE transition. 3240 It's originally: 3241 call *(%eax) 3242 3243 Change it to: 3244 xchg %ax,%ax 3245 or 3246 negl %eax 3247 depending on how we transformed the TLS_GOTDESC above. 3248 */ 3249 3250 bfd_vma roff; 3251 3252 roff = rel->r_offset; 3253 3254 /* Now modify the instruction as appropriate. */ 3255 if (tls_type != GOT_TLS_IE_NEG) 3256 { 3257 /* xchg %ax,%ax */ 3258 bfd_put_8 (output_bfd, 0x66, contents + roff); 3259 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 3260 } 3261 else 3262 { 3263 /* negl %eax */ 3264 bfd_put_8 (output_bfd, 0xf7, contents + roff); 3265 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1); 3266 } 3267 3268 continue; 3269 } 3270 else 3271 BFD_ASSERT (FALSE); 3272 break; 3273 3274 case R_386_TLS_LDM: 3275 if (! elf_i386_tls_transition (info, input_bfd, 3276 input_section, contents, 3277 symtab_hdr, sym_hashes, 3278 &r_type, GOT_UNKNOWN, rel, 3279 relend, h, r_symndx, TRUE)) 3280 return FALSE; 3281 3282 if (r_type != R_386_TLS_LDM) 3283 { 3284 /* LD->LE transition. Change 3285 leal foo@tlsldm(%ebx) %eax 3286 call ___tls_get_addr@PLT 3287 into: 3288 movl %gs:0, %eax 3289 nop 3290 leal 0(%esi,1), %esi 3291 or change 3292 leal foo@tlsldm(%reg) %eax 3293 call *___tls_get_addr@GOT(%reg) 3294 which may be converted to 3295 addr32 call ___tls_get_addr 3296 into: 3297 movl %gs:0, %eax 3298 leal 0(%esi), %esi */ 3299 BFD_ASSERT (r_type == R_386_TLS_LE_32); 3300 if (*(contents + rel->r_offset + 4) == 0xff 3301 || *(contents + rel->r_offset + 4) == 0x67) 3302 memcpy (contents + rel->r_offset - 2, 3303 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12); 3304 else 3305 memcpy (contents + rel->r_offset - 2, 3306 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); 3307 /* Skip R_386_PC32/R_386_PLT32. */ 3308 rel++; 3309 wrel++; 3310 continue; 3311 } 3312 3313 if (htab->elf.sgot == NULL) 3314 abort (); 3315 3316 off = htab->tls_ld_or_ldm_got.offset; 3317 if (off & 1) 3318 off &= ~1; 3319 else 3320 { 3321 Elf_Internal_Rela outrel; 3322 3323 if (htab->elf.srelgot == NULL) 3324 abort (); 3325 3326 outrel.r_offset = (htab->elf.sgot->output_section->vma 3327 + htab->elf.sgot->output_offset + off); 3328 3329 bfd_put_32 (output_bfd, 0, 3330 htab->elf.sgot->contents + off); 3331 bfd_put_32 (output_bfd, 0, 3332 htab->elf.sgot->contents + off + 4); 3333 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); 3334 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel); 3335 htab->tls_ld_or_ldm_got.offset |= 1; 3336 } 3337 relocation = htab->elf.sgot->output_section->vma 3338 + htab->elf.sgot->output_offset + off 3339 - htab->elf.sgotplt->output_section->vma 3340 - htab->elf.sgotplt->output_offset; 3341 unresolved_reloc = FALSE; 3342 break; 3343 3344 case R_386_TLS_LDO_32: 3345 if (!bfd_link_executable (info) 3346 || (input_section->flags & SEC_CODE) == 0) 3347 relocation -= _bfd_x86_elf_dtpoff_base (info); 3348 else 3349 /* When converting LDO to LE, we must negate. */ 3350 relocation = -elf_i386_tpoff (info, relocation); 3351 break; 3352 3353 case R_386_TLS_LE_32: 3354 case R_386_TLS_LE: 3355 if (!bfd_link_executable (info)) 3356 { 3357 Elf_Internal_Rela outrel; 3358 asection *sreloc; 3359 3360 outrel.r_offset = rel->r_offset 3361 + input_section->output_section->vma 3362 + input_section->output_offset; 3363 if (h != NULL && h->dynindx != -1) 3364 indx = h->dynindx; 3365 else 3366 indx = 0; 3367 if (r_type == R_386_TLS_LE_32) 3368 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); 3369 else 3370 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 3371 sreloc = elf_section_data (input_section)->sreloc; 3372 if (sreloc == NULL) 3373 abort (); 3374 elf_append_rel (output_bfd, sreloc, &outrel); 3375 if (indx) 3376 continue; 3377 else if (r_type == R_386_TLS_LE_32) 3378 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation; 3379 else 3380 relocation -= _bfd_x86_elf_dtpoff_base (info); 3381 } 3382 else if (r_type == R_386_TLS_LE_32) 3383 relocation = elf_i386_tpoff (info, relocation); 3384 else 3385 relocation = -elf_i386_tpoff (info, relocation); 3386 break; 3387 3388 default: 3389 break; 3390 } 3391 3392 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3393 because such sections are not SEC_ALLOC and thus ld.so will 3394 not process them. */ 3395 if (unresolved_reloc 3396 && !((input_section->flags & SEC_DEBUGGING) != 0 3397 && h->def_dynamic) 3398 && _bfd_elf_section_offset (output_bfd, info, input_section, 3399 rel->r_offset) != (bfd_vma) -1) 3400 { 3401 _bfd_error_handler 3402 /* xgettext:c-format */ 3403 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"), 3404 input_bfd, 3405 input_section, 3406 (uint64_t) rel->r_offset, 3407 howto->name, 3408 h->root.root.string); 3409 return FALSE; 3410 } 3411 3412 do_relocation: 3413 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3414 contents, rel->r_offset, 3415 relocation, 0); 3416 3417 check_relocation_error: 3418 if (r != bfd_reloc_ok) 3419 { 3420 const char *name; 3421 3422 if (h != NULL) 3423 name = h->root.root.string; 3424 else 3425 { 3426 name = bfd_elf_string_from_elf_section (input_bfd, 3427 symtab_hdr->sh_link, 3428 sym->st_name); 3429 if (name == NULL) 3430 return FALSE; 3431 if (*name == '\0') 3432 name = bfd_section_name (sec); 3433 } 3434 3435 if (r == bfd_reloc_overflow) 3436 (*info->callbacks->reloc_overflow) 3437 (info, (h ? &h->root : NULL), name, howto->name, 3438 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 3439 else 3440 { 3441 _bfd_error_handler 3442 /* xgettext:c-format */ 3443 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"), 3444 input_bfd, input_section, 3445 (uint64_t) rel->r_offset, name, (int) r); 3446 return FALSE; 3447 } 3448 } 3449 3450 if (wrel != rel) 3451 *wrel = *rel; 3452 } 3453 3454 if (wrel != rel) 3455 { 3456 Elf_Internal_Shdr *rel_hdr; 3457 size_t deleted = rel - wrel; 3458 3459 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); 3460 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; 3461 if (rel_hdr->sh_size == 0) 3462 { 3463 /* It is too late to remove an empty reloc section. Leave 3464 one NONE reloc. 3465 ??? What is wrong with an empty section??? */ 3466 rel_hdr->sh_size = rel_hdr->sh_entsize; 3467 deleted -= 1; 3468 } 3469 rel_hdr = _bfd_elf_single_rel_hdr (input_section); 3470 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; 3471 input_section->reloc_count -= deleted; 3472 } 3473 3474 return TRUE; 3475 } 3476 3477 /* Finish up dynamic symbol handling. We set the contents of various 3478 dynamic sections here. */ 3479 3480 static bfd_boolean 3481 elf_i386_finish_dynamic_symbol (bfd *output_bfd, 3482 struct bfd_link_info *info, 3483 struct elf_link_hash_entry *h, 3484 Elf_Internal_Sym *sym) 3485 { 3486 struct elf_x86_link_hash_table *htab; 3487 unsigned plt_entry_size; 3488 struct elf_x86_link_hash_entry *eh; 3489 bfd_boolean local_undefweak; 3490 bfd_boolean use_plt_second; 3491 3492 htab = elf_x86_hash_table (info, I386_ELF_DATA); 3493 if (htab == NULL) 3494 return FALSE; 3495 3496 plt_entry_size = htab->plt.plt_entry_size; 3497 3498 /* Use the second PLT section only if there is .plt section. */ 3499 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL; 3500 3501 eh = (struct elf_x86_link_hash_entry *) h; 3502 if (eh->no_finish_dynamic_symbol) 3503 abort (); 3504 3505 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for 3506 resolved undefined weak symbols in executable so that their 3507 references have value 0 at run-time. */ 3508 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); 3509 3510 if (h->plt.offset != (bfd_vma) -1) 3511 { 3512 bfd_vma plt_index, plt_offset; 3513 bfd_vma got_offset; 3514 Elf_Internal_Rela rel; 3515 bfd_byte *loc; 3516 asection *plt, *resolved_plt, *gotplt, *relplt; 3517 3518 /* When building a static executable, use .iplt, .igot.plt and 3519 .rel.iplt sections for STT_GNU_IFUNC symbols. */ 3520 if (htab->elf.splt != NULL) 3521 { 3522 plt = htab->elf.splt; 3523 gotplt = htab->elf.sgotplt; 3524 relplt = htab->elf.srelplt; 3525 } 3526 else 3527 { 3528 plt = htab->elf.iplt; 3529 gotplt = htab->elf.igotplt; 3530 relplt = htab->elf.irelplt; 3531 } 3532 3533 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak) 3534 3535 /* Get the index in the procedure linkage table which 3536 corresponds to this symbol. This is the index of this symbol 3537 in all the symbols for which we are making plt entries. The 3538 first entry in the procedure linkage table is reserved. 3539 3540 Get the offset into the .got table of the entry that 3541 corresponds to this function. Each .got entry is 4 bytes. 3542 The first three are reserved. 3543 3544 For static executables, we don't reserve anything. */ 3545 3546 if (plt == htab->elf.splt) 3547 { 3548 got_offset = (h->plt.offset / plt_entry_size 3549 - htab->plt.has_plt0); 3550 got_offset = (got_offset + 3) * 4; 3551 } 3552 else 3553 { 3554 got_offset = h->plt.offset / plt_entry_size; 3555 got_offset = got_offset * 4; 3556 } 3557 3558 /* Fill in the entry in the procedure linkage table and update 3559 the first slot. */ 3560 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry, 3561 plt_entry_size); 3562 3563 if (use_plt_second) 3564 { 3565 const bfd_byte *plt_entry; 3566 if (bfd_link_pic (info)) 3567 plt_entry = htab->non_lazy_plt->pic_plt_entry; 3568 else 3569 plt_entry = htab->non_lazy_plt->plt_entry; 3570 memcpy (htab->plt_second->contents + eh->plt_second.offset, 3571 plt_entry, htab->non_lazy_plt->plt_entry_size); 3572 3573 resolved_plt = htab->plt_second; 3574 plt_offset = eh->plt_second.offset; 3575 } 3576 else 3577 { 3578 resolved_plt = plt; 3579 plt_offset = h->plt.offset; 3580 } 3581 3582 if (! bfd_link_pic (info)) 3583 { 3584 bfd_put_32 (output_bfd, 3585 (gotplt->output_section->vma 3586 + gotplt->output_offset 3587 + got_offset), 3588 resolved_plt->contents + plt_offset 3589 + htab->plt.plt_got_offset); 3590 3591 if (htab->target_os == is_vxworks) 3592 { 3593 int s, k, reloc_index; 3594 3595 /* Create the R_386_32 relocation referencing the GOT 3596 for this PLT entry. */ 3597 3598 /* S: Current slot number (zero-based). */ 3599 s = ((h->plt.offset - htab->plt.plt_entry_size) 3600 / htab->plt.plt_entry_size); 3601 /* K: Number of relocations for PLTResolve. */ 3602 if (bfd_link_pic (info)) 3603 k = PLTRESOLVE_RELOCS_SHLIB; 3604 else 3605 k = PLTRESOLVE_RELOCS; 3606 /* Skip the PLTresolve relocations, and the relocations for 3607 the other PLT slots. */ 3608 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS; 3609 loc = (htab->srelplt2->contents + reloc_index 3610 * sizeof (Elf32_External_Rel)); 3611 3612 rel.r_offset = (plt->output_section->vma 3613 + plt->output_offset 3614 + h->plt.offset + 2), 3615 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 3616 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3617 3618 /* Create the R_386_32 relocation referencing the beginning of 3619 the PLT for this GOT entry. */ 3620 rel.r_offset = (htab->elf.sgotplt->output_section->vma 3621 + htab->elf.sgotplt->output_offset 3622 + got_offset); 3623 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); 3624 bfd_elf32_swap_reloc_out (output_bfd, &rel, 3625 loc + sizeof (Elf32_External_Rel)); 3626 } 3627 } 3628 else 3629 { 3630 bfd_put_32 (output_bfd, got_offset, 3631 resolved_plt->contents + plt_offset 3632 + htab->plt.plt_got_offset); 3633 } 3634 3635 /* Fill in the entry in the global offset table. Leave the entry 3636 as zero for undefined weak symbol in PIE. No PLT relocation 3637 against undefined weak symbol in PIE. */ 3638 if (!local_undefweak) 3639 { 3640 if (htab->plt.has_plt0) 3641 bfd_put_32 (output_bfd, 3642 (plt->output_section->vma 3643 + plt->output_offset 3644 + h->plt.offset 3645 + htab->lazy_plt->plt_lazy_offset), 3646 gotplt->contents + got_offset); 3647 3648 /* Fill in the entry in the .rel.plt section. */ 3649 rel.r_offset = (gotplt->output_section->vma 3650 + gotplt->output_offset 3651 + got_offset); 3652 if (PLT_LOCAL_IFUNC_P (info, h)) 3653 { 3654 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 3655 h->root.root.string, 3656 h->root.u.def.section->owner); 3657 3658 /* If an STT_GNU_IFUNC symbol is locally defined, generate 3659 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend 3660 in the .got.plt section. */ 3661 bfd_put_32 (output_bfd, 3662 (h->root.u.def.value 3663 + h->root.u.def.section->output_section->vma 3664 + h->root.u.def.section->output_offset), 3665 gotplt->contents + got_offset); 3666 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); 3667 /* R_386_IRELATIVE comes last. */ 3668 plt_index = htab->next_irelative_index--; 3669 } 3670 else 3671 { 3672 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); 3673 plt_index = htab->next_jump_slot_index++; 3674 } 3675 3676 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel); 3677 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3678 3679 /* Don't fill the second and third slots in PLT entry for 3680 static executables nor without PLT0. */ 3681 if (plt == htab->elf.splt && htab->plt.has_plt0) 3682 { 3683 bfd_put_32 (output_bfd, 3684 plt_index * sizeof (Elf32_External_Rel), 3685 plt->contents + h->plt.offset 3686 + htab->lazy_plt->plt_reloc_offset); 3687 bfd_put_32 (output_bfd, 3688 - (h->plt.offset 3689 + htab->lazy_plt->plt_plt_offset + 4), 3690 (plt->contents + h->plt.offset 3691 + htab->lazy_plt->plt_plt_offset)); 3692 } 3693 } 3694 } 3695 else if (eh->plt_got.offset != (bfd_vma) -1) 3696 { 3697 bfd_vma got_offset, plt_offset; 3698 asection *plt, *got, *gotplt; 3699 const bfd_byte *got_plt_entry; 3700 3701 /* Set the entry in the GOT procedure linkage table. */ 3702 plt = htab->plt_got; 3703 got = htab->elf.sgot; 3704 gotplt = htab->elf.sgotplt; 3705 got_offset = h->got.offset; 3706 3707 if (got_offset == (bfd_vma) -1 3708 || plt == NULL 3709 || got == NULL 3710 || gotplt == NULL) 3711 abort (); 3712 3713 /* Fill in the entry in the GOT procedure linkage table. */ 3714 if (! bfd_link_pic (info)) 3715 { 3716 got_plt_entry = htab->non_lazy_plt->plt_entry; 3717 got_offset += got->output_section->vma + got->output_offset; 3718 } 3719 else 3720 { 3721 got_plt_entry = htab->non_lazy_plt->pic_plt_entry; 3722 got_offset += (got->output_section->vma 3723 + got->output_offset 3724 - gotplt->output_section->vma 3725 - gotplt->output_offset); 3726 } 3727 3728 plt_offset = eh->plt_got.offset; 3729 memcpy (plt->contents + plt_offset, got_plt_entry, 3730 htab->non_lazy_plt->plt_entry_size); 3731 bfd_put_32 (output_bfd, got_offset, 3732 (plt->contents + plt_offset 3733 + htab->non_lazy_plt->plt_got_offset)); 3734 } 3735 3736 if (!local_undefweak 3737 && !h->def_regular 3738 && (h->plt.offset != (bfd_vma) -1 3739 || eh->plt_got.offset != (bfd_vma) -1)) 3740 { 3741 /* Mark the symbol as undefined, rather than as defined in 3742 the .plt section. Leave the value if there were any 3743 relocations where pointer equality matters (this is a clue 3744 for the dynamic linker, to make function pointer 3745 comparisons work between an application and shared 3746 library), otherwise set it to zero. If a function is only 3747 called from a binary, there is no need to slow down 3748 shared libraries because of that. */ 3749 sym->st_shndx = SHN_UNDEF; 3750 if (!h->pointer_equality_needed) 3751 sym->st_value = 0; 3752 } 3753 3754 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym); 3755 3756 /* Don't generate dynamic GOT relocation against undefined weak 3757 symbol in executable. */ 3758 if (h->got.offset != (bfd_vma) -1 3759 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type) 3760 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0 3761 && !local_undefweak) 3762 { 3763 Elf_Internal_Rela rel; 3764 asection *relgot = htab->elf.srelgot; 3765 3766 /* This symbol has an entry in the global offset table. Set it 3767 up. */ 3768 3769 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 3770 abort (); 3771 3772 rel.r_offset = (htab->elf.sgot->output_section->vma 3773 + htab->elf.sgot->output_offset 3774 + (h->got.offset & ~(bfd_vma) 1)); 3775 3776 /* If this is a static link, or it is a -Bsymbolic link and the 3777 symbol is defined locally or was forced to be local because 3778 of a version file, we just want to emit a RELATIVE reloc. 3779 The entry in the global offset table will already have been 3780 initialized in the relocate_section function. */ 3781 if (h->def_regular 3782 && h->type == STT_GNU_IFUNC) 3783 { 3784 if (h->plt.offset == (bfd_vma) -1) 3785 { 3786 /* STT_GNU_IFUNC is referenced without PLT. */ 3787 if (htab->elf.splt == NULL) 3788 { 3789 /* use .rel[a].iplt section to store .got relocations 3790 in static executable. */ 3791 relgot = htab->elf.irelplt; 3792 } 3793 if (SYMBOL_REFERENCES_LOCAL_P (info, h)) 3794 { 3795 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), 3796 h->root.root.string, 3797 h->root.u.def.section->owner); 3798 3799 bfd_put_32 (output_bfd, 3800 (h->root.u.def.value 3801 + h->root.u.def.section->output_section->vma 3802 + h->root.u.def.section->output_offset), 3803 htab->elf.sgot->contents + h->got.offset); 3804 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); 3805 } 3806 else 3807 goto do_glob_dat; 3808 } 3809 else if (bfd_link_pic (info)) 3810 { 3811 /* Generate R_386_GLOB_DAT. */ 3812 goto do_glob_dat; 3813 } 3814 else 3815 { 3816 asection *plt; 3817 bfd_vma plt_offset; 3818 3819 if (!h->pointer_equality_needed) 3820 abort (); 3821 3822 /* For non-shared object, we can't use .got.plt, which 3823 contains the real function addres if we need pointer 3824 equality. We load the GOT entry with the PLT entry. */ 3825 if (htab->plt_second != NULL) 3826 { 3827 plt = htab->plt_second; 3828 plt_offset = eh->plt_second.offset; 3829 } 3830 else 3831 { 3832 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; 3833 plt_offset = h->plt.offset; 3834 } 3835 bfd_put_32 (output_bfd, 3836 (plt->output_section->vma 3837 + plt->output_offset + plt_offset), 3838 htab->elf.sgot->contents + h->got.offset); 3839 return TRUE; 3840 } 3841 } 3842 else if (bfd_link_pic (info) 3843 && SYMBOL_REFERENCES_LOCAL_P (info, h)) 3844 { 3845 BFD_ASSERT((h->got.offset & 1) != 0); 3846 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 3847 } 3848 else 3849 { 3850 BFD_ASSERT((h->got.offset & 1) == 0); 3851 do_glob_dat: 3852 bfd_put_32 (output_bfd, (bfd_vma) 0, 3853 htab->elf.sgot->contents + h->got.offset); 3854 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); 3855 } 3856 3857 elf_append_rel (output_bfd, relgot, &rel); 3858 } 3859 3860 if (h->needs_copy) 3861 { 3862 Elf_Internal_Rela rel; 3863 asection *s; 3864 3865 /* This symbol needs a copy reloc. Set it up. */ 3866 VERIFY_COPY_RELOC (h, htab) 3867 3868 rel.r_offset = (h->root.u.def.value 3869 + h->root.u.def.section->output_section->vma 3870 + h->root.u.def.section->output_offset); 3871 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); 3872 if (h->root.u.def.section == htab->elf.sdynrelro) 3873 s = htab->elf.sreldynrelro; 3874 else 3875 s = htab->elf.srelbss; 3876 elf_append_rel (output_bfd, s, &rel); 3877 } 3878 3879 return TRUE; 3880 } 3881 3882 /* Finish up local dynamic symbol handling. We set the contents of 3883 various dynamic sections here. */ 3884 3885 static bfd_boolean 3886 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf) 3887 { 3888 struct elf_link_hash_entry *h 3889 = (struct elf_link_hash_entry *) *slot; 3890 struct bfd_link_info *info 3891 = (struct bfd_link_info *) inf; 3892 3893 return elf_i386_finish_dynamic_symbol (info->output_bfd, info, 3894 h, NULL); 3895 } 3896 3897 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry 3898 here since undefined weak symbol may not be dynamic and may not be 3899 called for elf_i386_finish_dynamic_symbol. */ 3900 3901 static bfd_boolean 3902 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh, 3903 void *inf) 3904 { 3905 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh; 3906 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3907 3908 if (h->root.type != bfd_link_hash_undefweak 3909 || h->dynindx != -1) 3910 return TRUE; 3911 3912 return elf_i386_finish_dynamic_symbol (info->output_bfd, 3913 info, h, NULL); 3914 } 3915 3916 /* Used to decide how to sort relocs in an optimal manner for the 3917 dynamic linker, before writing them out. */ 3918 3919 static enum elf_reloc_type_class 3920 elf_i386_reloc_type_class (const struct bfd_link_info *info, 3921 const asection *rel_sec ATTRIBUTE_UNUSED, 3922 const Elf_Internal_Rela *rela) 3923 { 3924 bfd *abfd = info->output_bfd; 3925 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 3926 struct elf_link_hash_table *htab = elf_hash_table (info); 3927 3928 if (htab->dynsym != NULL 3929 && htab->dynsym->contents != NULL) 3930 { 3931 /* Check relocation against STT_GNU_IFUNC symbol if there are 3932 dynamic symbols. */ 3933 unsigned long r_symndx = ELF32_R_SYM (rela->r_info); 3934 if (r_symndx != STN_UNDEF) 3935 { 3936 Elf_Internal_Sym sym; 3937 if (!bed->s->swap_symbol_in (abfd, 3938 (htab->dynsym->contents 3939 + r_symndx * sizeof (Elf32_External_Sym)), 3940 0, &sym)) 3941 abort (); 3942 3943 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) 3944 return reloc_class_ifunc; 3945 } 3946 } 3947 3948 switch (ELF32_R_TYPE (rela->r_info)) 3949 { 3950 case R_386_IRELATIVE: 3951 return reloc_class_ifunc; 3952 case R_386_RELATIVE: 3953 return reloc_class_relative; 3954 case R_386_JUMP_SLOT: 3955 return reloc_class_plt; 3956 case R_386_COPY: 3957 return reloc_class_copy; 3958 default: 3959 return reloc_class_normal; 3960 } 3961 } 3962 3963 /* Finish up the dynamic sections. */ 3964 3965 static bfd_boolean 3966 elf_i386_finish_dynamic_sections (bfd *output_bfd, 3967 struct bfd_link_info *info) 3968 { 3969 struct elf_x86_link_hash_table *htab; 3970 3971 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info); 3972 if (htab == NULL) 3973 return FALSE; 3974 3975 if (!htab->elf.dynamic_sections_created) 3976 return TRUE; 3977 3978 if (htab->elf.splt && htab->elf.splt->size > 0) 3979 { 3980 /* UnixWare sets the entsize of .plt to 4, although that doesn't 3981 really seem like the right value. */ 3982 elf_section_data (htab->elf.splt->output_section) 3983 ->this_hdr.sh_entsize = 4; 3984 3985 if (htab->plt.has_plt0) 3986 { 3987 /* Fill in the special first entry in the procedure linkage 3988 table. */ 3989 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry, 3990 htab->lazy_plt->plt0_entry_size); 3991 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size, 3992 htab->plt0_pad_byte, 3993 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size); 3994 if (!bfd_link_pic (info)) 3995 { 3996 bfd_put_32 (output_bfd, 3997 (htab->elf.sgotplt->output_section->vma 3998 + htab->elf.sgotplt->output_offset 3999 + 4), 4000 htab->elf.splt->contents 4001 + htab->lazy_plt->plt0_got1_offset); 4002 bfd_put_32 (output_bfd, 4003 (htab->elf.sgotplt->output_section->vma 4004 + htab->elf.sgotplt->output_offset 4005 + 8), 4006 htab->elf.splt->contents 4007 + htab->lazy_plt->plt0_got2_offset); 4008 4009 if (htab->target_os == is_vxworks) 4010 { 4011 Elf_Internal_Rela rel; 4012 int num_plts = (htab->elf.splt->size 4013 / htab->plt.plt_entry_size) - 1; 4014 unsigned char *p; 4015 asection *srelplt2 = htab->srelplt2; 4016 4017 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ 4018 + 4. On IA32 we use REL relocations so the 4019 addend goes in the PLT directly. */ 4020 rel.r_offset = (htab->elf.splt->output_section->vma 4021 + htab->elf.splt->output_offset 4022 + htab->lazy_plt->plt0_got1_offset); 4023 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, 4024 R_386_32); 4025 bfd_elf32_swap_reloc_out (output_bfd, &rel, 4026 srelplt2->contents); 4027 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ 4028 + 8. */ 4029 rel.r_offset = (htab->elf.splt->output_section->vma 4030 + htab->elf.splt->output_offset 4031 + htab->lazy_plt->plt0_got2_offset); 4032 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, 4033 R_386_32); 4034 bfd_elf32_swap_reloc_out (output_bfd, &rel, 4035 srelplt2->contents + 4036 sizeof (Elf32_External_Rel)); 4037 /* Correct the .rel.plt.unloaded relocations. */ 4038 p = srelplt2->contents; 4039 if (bfd_link_pic (info)) 4040 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel); 4041 else 4042 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel); 4043 4044 for (; num_plts; num_plts--) 4045 { 4046 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 4047 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, 4048 R_386_32); 4049 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 4050 p += sizeof (Elf32_External_Rel); 4051 4052 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 4053 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, 4054 R_386_32); 4055 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 4056 p += sizeof (Elf32_External_Rel); 4057 } 4058 } 4059 } 4060 } 4061 } 4062 4063 /* Fill PLT entries for undefined weak symbols in PIE. */ 4064 if (bfd_link_pie (info)) 4065 bfd_hash_traverse (&info->hash->table, 4066 elf_i386_pie_finish_undefweak_symbol, 4067 info); 4068 4069 return TRUE; 4070 } 4071 4072 /* Fill PLT/GOT entries and allocate dynamic relocations for local 4073 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table. 4074 It has to be done before elf_link_sort_relocs is called so that 4075 dynamic relocations are properly sorted. */ 4076 4077 static bfd_boolean 4078 elf_i386_output_arch_local_syms 4079 (bfd *output_bfd ATTRIBUTE_UNUSED, 4080 struct bfd_link_info *info, 4081 void *flaginfo ATTRIBUTE_UNUSED, 4082 int (*func) (void *, const char *, 4083 Elf_Internal_Sym *, 4084 asection *, 4085 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED) 4086 { 4087 struct elf_x86_link_hash_table *htab 4088 = elf_x86_hash_table (info, I386_ELF_DATA); 4089 if (htab == NULL) 4090 return FALSE; 4091 4092 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ 4093 htab_traverse (htab->loc_hash_table, 4094 elf_i386_finish_local_dynamic_symbol, 4095 info); 4096 4097 return TRUE; 4098 } 4099 4100 /* Forward declaration. */ 4101 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt; 4102 4103 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all 4104 dynamic relocations. */ 4105 4106 static long 4107 elf_i386_get_synthetic_symtab (bfd *abfd, 4108 long symcount ATTRIBUTE_UNUSED, 4109 asymbol **syms ATTRIBUTE_UNUSED, 4110 long dynsymcount, 4111 asymbol **dynsyms, 4112 asymbol **ret) 4113 { 4114 long count, i, n; 4115 int j; 4116 bfd_byte *plt_contents; 4117 long relsize; 4118 const struct elf_x86_lazy_plt_layout *lazy_plt; 4119 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; 4120 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt; 4121 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt; 4122 asection *plt; 4123 bfd_vma got_addr; 4124 enum elf_x86_plt_type plt_type; 4125 struct elf_x86_plt plts[] = 4126 { 4127 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 }, 4128 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }, 4129 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 }, 4130 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 } 4131 }; 4132 4133 *ret = NULL; 4134 4135 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0) 4136 return 0; 4137 4138 if (dynsymcount <= 0) 4139 return 0; 4140 4141 relsize = bfd_get_dynamic_reloc_upper_bound (abfd); 4142 if (relsize <= 0) 4143 return -1; 4144 4145 non_lazy_plt = NULL; 4146 /* Silence GCC 6. */ 4147 lazy_plt = NULL; 4148 non_lazy_ibt_plt = NULL; 4149 lazy_ibt_plt = NULL; 4150 switch (get_elf_x86_backend_data (abfd)->target_os) 4151 { 4152 case is_normal: 4153 case is_solaris: 4154 non_lazy_plt = &elf_i386_non_lazy_plt; 4155 lazy_ibt_plt = &elf_i386_lazy_ibt_plt; 4156 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt; 4157 /* Fall through */ 4158 case is_vxworks: 4159 lazy_plt = &elf_i386_lazy_plt; 4160 break; 4161 case is_nacl: 4162 lazy_plt = &elf_i386_nacl_plt; 4163 break; 4164 } 4165 4166 got_addr = 0; 4167 4168 count = 0; 4169 for (j = 0; plts[j].name != NULL; j++) 4170 { 4171 plt = bfd_get_section_by_name (abfd, plts[j].name); 4172 if (plt == NULL || plt->size == 0) 4173 continue; 4174 4175 /* Get the PLT section contents. */ 4176 plt_contents = (bfd_byte *) bfd_malloc (plt->size); 4177 if (plt_contents == NULL) 4178 break; 4179 if (!bfd_get_section_contents (abfd, (asection *) plt, 4180 plt_contents, 0, plt->size)) 4181 { 4182 free (plt_contents); 4183 break; 4184 } 4185 4186 /* Check what kind of PLT it is. */ 4187 plt_type = plt_unknown; 4188 if (plts[j].type == plt_unknown 4189 && (plt->size >= (lazy_plt->plt0_entry_size 4190 + lazy_plt->plt_entry_size))) 4191 { 4192 /* Match lazy PLT first. */ 4193 if (memcmp (plt_contents, lazy_plt->plt0_entry, 4194 lazy_plt->plt0_got1_offset) == 0) 4195 { 4196 /* The fist entry in the lazy IBT PLT is the same as the 4197 normal lazy PLT. */ 4198 if (lazy_ibt_plt != NULL 4199 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size, 4200 lazy_ibt_plt->plt_entry, 4201 lazy_ibt_plt->plt_got_offset) == 0)) 4202 plt_type = plt_lazy | plt_second; 4203 else 4204 plt_type = plt_lazy; 4205 } 4206 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry, 4207 lazy_plt->plt0_got1_offset) == 0) 4208 { 4209 /* The fist entry in the PIC lazy IBT PLT is the same as 4210 the normal PIC lazy PLT. */ 4211 if (lazy_ibt_plt != NULL 4212 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size, 4213 lazy_ibt_plt->pic_plt_entry, 4214 lazy_ibt_plt->plt_got_offset) == 0)) 4215 plt_type = plt_lazy | plt_pic | plt_second; 4216 else 4217 plt_type = plt_lazy | plt_pic; 4218 } 4219 } 4220 4221 if (non_lazy_plt != NULL 4222 && (plt_type == plt_unknown || plt_type == plt_non_lazy) 4223 && plt->size >= non_lazy_plt->plt_entry_size) 4224 { 4225 /* Match non-lazy PLT. */ 4226 if (memcmp (plt_contents, non_lazy_plt->plt_entry, 4227 non_lazy_plt->plt_got_offset) == 0) 4228 plt_type = plt_non_lazy; 4229 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry, 4230 non_lazy_plt->plt_got_offset) == 0) 4231 plt_type = plt_pic; 4232 } 4233 4234 if ((non_lazy_ibt_plt != NULL) 4235 && (plt_type == plt_unknown || plt_type == plt_second) 4236 && plt->size >= non_lazy_ibt_plt->plt_entry_size) 4237 { 4238 if (memcmp (plt_contents, 4239 non_lazy_ibt_plt->plt_entry, 4240 non_lazy_ibt_plt->plt_got_offset) == 0) 4241 { 4242 /* Match IBT PLT. */ 4243 plt_type = plt_second; 4244 non_lazy_plt = non_lazy_ibt_plt; 4245 } 4246 else if (memcmp (plt_contents, 4247 non_lazy_ibt_plt->pic_plt_entry, 4248 non_lazy_ibt_plt->plt_got_offset) == 0) 4249 { 4250 /* Match PIC IBT PLT. */ 4251 plt_type = plt_second | plt_pic; 4252 non_lazy_plt = non_lazy_ibt_plt; 4253 } 4254 } 4255 4256 if (plt_type == plt_unknown) 4257 { 4258 free (plt_contents); 4259 continue; 4260 } 4261 4262 plts[j].sec = plt; 4263 plts[j].type = plt_type; 4264 4265 if ((plt_type & plt_lazy)) 4266 { 4267 plts[j].plt_got_offset = lazy_plt->plt_got_offset; 4268 plts[j].plt_entry_size = lazy_plt->plt_entry_size; 4269 /* Skip PLT0 in lazy PLT. */ 4270 i = 1; 4271 } 4272 else 4273 { 4274 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset; 4275 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size; 4276 i = 0; 4277 } 4278 4279 /* Skip lazy PLT when the second PLT is used. */ 4280 if ((plt_type & (plt_lazy | plt_second)) 4281 == (plt_lazy | plt_second)) 4282 plts[j].count = 0; 4283 else 4284 { 4285 n = plt->size / plts[j].plt_entry_size; 4286 plts[j].count = n; 4287 count += n - i; 4288 } 4289 4290 plts[j].contents = plt_contents; 4291 4292 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */ 4293 if ((plt_type & plt_pic)) 4294 got_addr = (bfd_vma) -1; 4295 } 4296 4297 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize, 4298 got_addr, plts, dynsyms, 4299 ret); 4300 } 4301 4302 /* Set up i386 GNU properties. Return the first relocatable ELF input 4303 with GNU properties if found. Otherwise, return NULL. */ 4304 4305 static bfd * 4306 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info) 4307 { 4308 struct elf_x86_init_table init_table; 4309 4310 switch (get_elf_x86_backend_data (info->output_bfd)->target_os) 4311 { 4312 case is_normal: 4313 case is_solaris: 4314 init_table.plt0_pad_byte = 0x0; 4315 init_table.lazy_plt = &elf_i386_lazy_plt; 4316 init_table.non_lazy_plt = &elf_i386_non_lazy_plt; 4317 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt; 4318 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt; 4319 break; 4320 case is_vxworks: 4321 init_table.plt0_pad_byte = 0x90; 4322 init_table.lazy_plt = &elf_i386_lazy_plt; 4323 init_table.non_lazy_plt = NULL; 4324 init_table.lazy_ibt_plt = NULL; 4325 init_table.non_lazy_ibt_plt = NULL; 4326 break; 4327 case is_nacl: 4328 init_table.plt0_pad_byte = 0x90; 4329 init_table.lazy_plt = &elf_i386_nacl_plt; 4330 init_table.non_lazy_plt = NULL; 4331 init_table.lazy_ibt_plt = NULL; 4332 init_table.non_lazy_ibt_plt = NULL; 4333 break; 4334 } 4335 4336 init_table.r_info = elf32_r_info; 4337 init_table.r_sym = elf32_r_sym; 4338 4339 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table); 4340 } 4341 4342 #define TARGET_LITTLE_SYM i386_elf32_vec 4343 #define TARGET_LITTLE_NAME "elf32-i386" 4344 #define ELF_ARCH bfd_arch_i386 4345 #define ELF_TARGET_ID I386_ELF_DATA 4346 #define ELF_MACHINE_CODE EM_386 4347 #define ELF_MAXPAGESIZE 0x1000 4348 4349 #define elf_backend_can_gc_sections 1 4350 #define elf_backend_can_refcount 1 4351 #define elf_backend_want_got_plt 1 4352 #define elf_backend_plt_readonly 1 4353 #define elf_backend_want_plt_sym 0 4354 #define elf_backend_got_header_size 12 4355 #define elf_backend_plt_alignment 4 4356 #define elf_backend_dtrel_excludes_plt 1 4357 #define elf_backend_extern_protected_data 1 4358 #define elf_backend_caches_rawsize 1 4359 #define elf_backend_want_dynrelro 1 4360 4361 /* Support RELA for objdump of prelink objects. */ 4362 #define elf_info_to_howto elf_i386_info_to_howto_rel 4363 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel 4364 4365 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name 4366 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup 4367 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup 4368 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab 4369 4370 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible 4371 #define elf_backend_check_relocs elf_i386_check_relocs 4372 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections 4373 #define elf_backend_fake_sections elf_i386_fake_sections 4374 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections 4375 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol 4376 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms 4377 #define elf_backend_grok_prstatus elf_i386_grok_prstatus 4378 #define elf_backend_grok_psinfo elf_i386_grok_psinfo 4379 #define elf_backend_reloc_type_class elf_i386_reloc_type_class 4380 #define elf_backend_relocate_section elf_i386_relocate_section 4381 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties 4382 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol 4383 4384 #define elf_backend_linux_prpsinfo32_ugid16 TRUE 4385 4386 #define elf32_bed elf32_i386_bed 4387 4388 #include "elf32-target.h" 4389 4390 /* FreeBSD support. */ 4391 4392 #undef TARGET_LITTLE_SYM 4393 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec 4394 #undef TARGET_LITTLE_NAME 4395 #define TARGET_LITTLE_NAME "elf32-i386-freebsd" 4396 #undef ELF_OSABI 4397 #define ELF_OSABI ELFOSABI_FREEBSD 4398 4399 /* The kernel recognizes executables as valid only if they carry a 4400 "FreeBSD" label in the ELF header. So we put this label on all 4401 executables and (for simplicity) also all other object files. */ 4402 4403 static bfd_boolean 4404 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info) 4405 { 4406 if (!_bfd_elf_init_file_header (abfd, info)) 4407 return FALSE; 4408 4409 #ifdef OLD_FREEBSD_ABI_LABEL 4410 { 4411 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ 4412 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd); 4413 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); 4414 } 4415 #endif 4416 return TRUE; 4417 } 4418 4419 #undef elf_backend_init_file_header 4420 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header 4421 #undef elf32_bed 4422 #define elf32_bed elf32_i386_fbsd_bed 4423 4424 #undef elf_backend_add_symbol_hook 4425 4426 #include "elf32-target.h" 4427 4428 #undef elf_backend_init_file_header 4429 4430 /* Solaris 2. */ 4431 4432 #undef TARGET_LITTLE_SYM 4433 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec 4434 #undef TARGET_LITTLE_NAME 4435 #define TARGET_LITTLE_NAME "elf32-i386-sol2" 4436 4437 static const struct elf_x86_backend_data elf_i386_solaris_arch_bed = 4438 { 4439 is_solaris /* os */ 4440 }; 4441 4442 #undef elf_backend_arch_data 4443 #define elf_backend_arch_data &elf_i386_solaris_arch_bed 4444 4445 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE 4446 objects won't be recognized. */ 4447 #undef ELF_OSABI 4448 4449 #undef elf32_bed 4450 #define elf32_bed elf32_i386_sol2_bed 4451 4452 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte 4453 boundary. */ 4454 #undef elf_backend_static_tls_alignment 4455 #define elf_backend_static_tls_alignment 8 4456 4457 /* The Solaris 2 ABI requires a plt symbol on all platforms. 4458 4459 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output 4460 File, p.63. */ 4461 #undef elf_backend_want_plt_sym 4462 #define elf_backend_want_plt_sym 1 4463 4464 #undef elf_backend_strtab_flags 4465 #define elf_backend_strtab_flags SHF_STRINGS 4466 4467 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which 4468 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised 4469 FALSE otherwise. ISECTION is the best guess matching section from the 4470 input bfd IBFD, but it might be NULL. */ 4471 4472 static bfd_boolean 4473 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED, 4474 bfd *obfd ATTRIBUTE_UNUSED, 4475 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED, 4476 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED) 4477 { 4478 /* PR 19938: FIXME: Need to add code for setting the sh_info 4479 and sh_link fields of Solaris specific section types. */ 4480 return FALSE; 4481 4482 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13, 4483 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation: 4484 4485 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc 4486 4487 The following values should be set: 4488 4489 Type Link Info 4490 ----------------------------------------------------------------------------- 4491 SHT_SUNW_ancillary The section header index of 0 4492 [0x6fffffee] the associated string table. 4493 4494 SHT_SUNW_capinfo The section header index of For a dynamic object, the 4495 [0x6ffffff0] the associated symbol table. section header index of 4496 the associated 4497 SHT_SUNW_capchain table, 4498 otherwise 0. 4499 4500 SHT_SUNW_symsort The section header index of 0 4501 [0x6ffffff1] the associated symbol table. 4502 4503 SHT_SUNW_tlssort The section header index of 0 4504 [0x6ffffff2] the associated symbol table. 4505 4506 SHT_SUNW_LDYNSYM The section header index of One greater than the 4507 [0x6ffffff3] the associated string table. symbol table index of the 4508 This index is the same string last local symbol, 4509 table used by the SHT_DYNSYM STB_LOCAL. Since 4510 section. SHT_SUNW_LDYNSYM only 4511 contains local symbols, 4512 sh_info is equivalent to 4513 the number of symbols in 4514 the table. 4515 4516 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer 4517 [0x6ffffff5] the section header index of to named strings, the 4518 the associated section header index of 4519 SHT_SUNW_capinfo table, the associated string 4520 otherwise 0. table, otherwise 0. 4521 4522 SHT_SUNW_move The section header index of 0 4523 [0x6ffffffa] the associated symbol table. 4524 4525 SHT_SUNW_COMDAT 0 0 4526 [0x6ffffffb] 4527 4528 SHT_SUNW_syminfo The section header index of The section header index 4529 [0x6ffffffc] the associated symbol table. of the associated 4530 .dynamic section. 4531 4532 SHT_SUNW_verdef The section header index of The number of version 4533 [0x6ffffffd] the associated string table. definitions within the 4534 section. 4535 4536 SHT_SUNW_verneed The section header index of The number of version 4537 [0x6ffffffe] the associated string table. dependencies within the 4538 section. 4539 4540 SHT_SUNW_versym The section header index of 0 4541 [0x6fffffff] the associated symbol table. */ 4542 } 4543 4544 #undef elf_backend_copy_special_section_fields 4545 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields 4546 4547 #include "elf32-target.h" 4548 4549 /* Intel MCU support. */ 4550 4551 static bfd_boolean 4552 elf32_iamcu_elf_object_p (bfd *abfd) 4553 { 4554 /* Set the right machine number for an IAMCU elf32 file. */ 4555 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu); 4556 return TRUE; 4557 } 4558 4559 #undef TARGET_LITTLE_SYM 4560 #define TARGET_LITTLE_SYM iamcu_elf32_vec 4561 #undef TARGET_LITTLE_NAME 4562 #define TARGET_LITTLE_NAME "elf32-iamcu" 4563 #undef ELF_ARCH 4564 #define ELF_ARCH bfd_arch_iamcu 4565 4566 #undef ELF_MACHINE_CODE 4567 #define ELF_MACHINE_CODE EM_IAMCU 4568 4569 #undef elf_backend_arch_data 4570 #define elf_backend_arch_data &elf_i386_arch_bed 4571 4572 #undef ELF_OSABI 4573 4574 #undef elf32_bed 4575 #define elf32_bed elf32_iamcu_bed 4576 4577 #undef elf_backend_object_p 4578 #define elf_backend_object_p elf32_iamcu_elf_object_p 4579 4580 #undef elf_backend_static_tls_alignment 4581 4582 #undef elf_backend_want_plt_sym 4583 #define elf_backend_want_plt_sym 0 4584 4585 #undef elf_backend_strtab_flags 4586 #undef elf_backend_copy_special_section_fields 4587 4588 #include "elf32-target.h" 4589 4590 /* Restore defaults. */ 4591 #undef ELF_ARCH 4592 #define ELF_ARCH bfd_arch_i386 4593 #undef ELF_MACHINE_CODE 4594 #define ELF_MACHINE_CODE EM_386 4595 4596 /* Native Client support. */ 4597 4598 #undef TARGET_LITTLE_SYM 4599 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec 4600 #undef TARGET_LITTLE_NAME 4601 #define TARGET_LITTLE_NAME "elf32-i386-nacl" 4602 #undef elf32_bed 4603 #define elf32_bed elf32_i386_nacl_bed 4604 4605 #undef ELF_MAXPAGESIZE 4606 #define ELF_MAXPAGESIZE 0x10000 4607 4608 /* Restore defaults. */ 4609 #undef ELF_OSABI 4610 #undef elf_backend_want_plt_sym 4611 #define elf_backend_want_plt_sym 0 4612 #undef elf_backend_static_tls_alignment 4613 4614 /* NaCl uses substantially different PLT entries for the same effects. */ 4615 4616 #undef elf_backend_plt_alignment 4617 #define elf_backend_plt_alignment 5 4618 #define NACL_PLT_ENTRY_SIZE 64 4619 #define NACLMASK 0xe0 /* 32-byte alignment mask. */ 4620 4621 static const bfd_byte elf_i386_nacl_plt0_entry[] = 4622 { 4623 0xff, 0x35, /* pushl contents of address */ 4624 0, 0, 0, 0, /* replaced with address of .got + 4. */ 4625 0x8b, 0x0d, /* movl contents of address, %ecx */ 4626 0, 0, 0, 0, /* replaced with address of .got + 8. */ 4627 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */ 4628 0xff, 0xe1 /* jmp *%ecx */ 4629 }; 4630 4631 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] = 4632 { 4633 0x8b, 0x0d, /* movl contents of address, %ecx */ 4634 0, 0, 0, 0, /* replaced with GOT slot address. */ 4635 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */ 4636 0xff, 0xe1, /* jmp *%ecx */ 4637 4638 /* Pad to the next 32-byte boundary with nop instructions. */ 4639 0x90, 4640 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 4641 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 4642 4643 /* Lazy GOT entries point here (32-byte aligned). */ 4644 0x68, /* pushl immediate */ 4645 0, 0, 0, 0, /* replaced with reloc offset. */ 4646 0xe9, /* jmp relative */ 4647 0, 0, 0, 0, /* replaced with offset to .plt. */ 4648 4649 /* Pad to the next 32-byte boundary with nop instructions. */ 4650 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 4651 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 4652 0x90, 0x90 4653 }; 4654 4655 static const bfd_byte 4656 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] = 4657 { 4658 0xff, 0x73, 0x04, /* pushl 4(%ebx) */ 4659 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */ 4660 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */ 4661 0xff, 0xe1, /* jmp *%ecx */ 4662 4663 /* This is expected to be the same size as elf_i386_nacl_plt0_entry, 4664 so pad to that size with nop instructions. */ 4665 0x90, 0x90, 0x90, 0x90, 0x90, 0x90 4666 }; 4667 4668 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] = 4669 { 4670 0x8b, 0x8b, /* movl offset(%ebx), %ecx */ 4671 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 4672 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */ 4673 0xff, 0xe1, /* jmp *%ecx */ 4674 4675 /* Pad to the next 32-byte boundary with nop instructions. */ 4676 0x90, 4677 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 4678 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 4679 4680 /* Lazy GOT entries point here (32-byte aligned). */ 4681 0x68, /* pushl immediate */ 4682 0, 0, 0, 0, /* replaced with offset into relocation table. */ 4683 0xe9, /* jmp relative */ 4684 0, 0, 0, 0, /* replaced with offset to start of .plt. */ 4685 4686 /* Pad to the next 32-byte boundary with nop instructions. */ 4687 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 4688 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 4689 0x90, 0x90 4690 }; 4691 4692 static const bfd_byte elf_i386_nacl_eh_frame_plt[] = 4693 { 4694 #if (PLT_CIE_LENGTH != 20 \ 4695 || PLT_FDE_LENGTH != 36 \ 4696 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \ 4697 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12) 4698 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!" 4699 #endif 4700 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 4701 0, 0, 0, 0, /* CIE ID */ 4702 1, /* CIE version */ 4703 'z', 'R', 0, /* Augmentation string */ 4704 1, /* Code alignment factor */ 4705 0x7c, /* Data alignment factor: -4 */ 4706 8, /* Return address column */ 4707 1, /* Augmentation size */ 4708 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 4709 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ 4710 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ 4711 DW_CFA_nop, DW_CFA_nop, 4712 4713 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 4714 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 4715 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ 4716 0, 0, 0, 0, /* .plt size goes here */ 4717 0, /* Augmentation size */ 4718 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ 4719 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 4720 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ 4721 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */ 4722 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 4723 13, /* Block length */ 4724 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ 4725 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ 4726 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge, 4727 DW_OP_lit2, DW_OP_shl, DW_OP_plus, 4728 DW_CFA_nop, DW_CFA_nop 4729 }; 4730 4731 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt = 4732 { 4733 elf_i386_nacl_plt0_entry, /* plt0_entry */ 4734 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */ 4735 elf_i386_nacl_plt_entry, /* plt_entry */ 4736 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */ 4737 NULL, /* plt_tlsdesc_entry */ 4738 0, /* plt_tlsdesc_entry_size*/ 4739 0, /* plt_tlsdesc_got1_offset */ 4740 0, /* plt_tlsdesc_got2_offset */ 4741 0, /* plt_tlsdesc_got1_insn_end */ 4742 0, /* plt_tlsdesc_got2_insn_end */ 4743 2, /* plt0_got1_offset */ 4744 8, /* plt0_got2_offset */ 4745 0, /* plt0_got2_insn_end */ 4746 2, /* plt_got_offset */ 4747 33, /* plt_reloc_offset */ 4748 38, /* plt_plt_offset */ 4749 0, /* plt_got_insn_size */ 4750 0, /* plt_plt_insn_end */ 4751 32, /* plt_lazy_offset */ 4752 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */ 4753 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */ 4754 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */ 4755 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */ 4756 }; 4757 4758 static const struct elf_x86_backend_data elf_i386_nacl_arch_bed = 4759 { 4760 is_nacl /* os */ 4761 }; 4762 4763 static bfd_boolean 4764 elf32_i386_nacl_elf_object_p (bfd *abfd) 4765 { 4766 /* Set the right machine number for a NaCl i386 ELF32 file. */ 4767 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl); 4768 return TRUE; 4769 } 4770 4771 #undef elf_backend_arch_data 4772 #define elf_backend_arch_data &elf_i386_nacl_arch_bed 4773 4774 #undef elf_backend_object_p 4775 #define elf_backend_object_p elf32_i386_nacl_elf_object_p 4776 #undef elf_backend_modify_segment_map 4777 #define elf_backend_modify_segment_map nacl_modify_segment_map 4778 #undef elf_backend_modify_headers 4779 #define elf_backend_modify_headers nacl_modify_headers 4780 #undef elf_backend_final_write_processing 4781 #define elf_backend_final_write_processing nacl_final_write_processing 4782 4783 #include "elf32-target.h" 4784 4785 /* Restore defaults. */ 4786 #undef elf_backend_object_p 4787 #undef elf_backend_modify_segment_map 4788 #undef elf_backend_modify_headers 4789 #undef elf_backend_final_write_processing 4790 4791 /* VxWorks support. */ 4792 4793 #undef TARGET_LITTLE_SYM 4794 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec 4795 #undef TARGET_LITTLE_NAME 4796 #define TARGET_LITTLE_NAME "elf32-i386-vxworks" 4797 #undef ELF_OSABI 4798 #undef ELF_MAXPAGESIZE 4799 #define ELF_MAXPAGESIZE 0x1000 4800 #undef elf_backend_plt_alignment 4801 #define elf_backend_plt_alignment 4 4802 4803 static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed = 4804 { 4805 is_vxworks /* os */ 4806 }; 4807 4808 #undef elf_backend_arch_data 4809 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed 4810 4811 #undef elf_backend_relocs_compatible 4812 #undef elf_backend_add_symbol_hook 4813 #define elf_backend_add_symbol_hook \ 4814 elf_vxworks_add_symbol_hook 4815 #undef elf_backend_link_output_symbol_hook 4816 #define elf_backend_link_output_symbol_hook \ 4817 elf_vxworks_link_output_symbol_hook 4818 #undef elf_backend_emit_relocs 4819 #define elf_backend_emit_relocs elf_vxworks_emit_relocs 4820 #undef elf_backend_final_write_processing 4821 #define elf_backend_final_write_processing \ 4822 elf_vxworks_final_write_processing 4823 #undef elf_backend_static_tls_alignment 4824 4825 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so 4826 define it. */ 4827 #undef elf_backend_want_plt_sym 4828 #define elf_backend_want_plt_sym 1 4829 4830 #undef elf32_bed 4831 #define elf32_bed elf32_i386_vxworks_bed 4832 4833 #include "elf32-target.h" 4834