1 /* Intel 80386/80486-specific support for 32-bit ELF 2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 3 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 4 Free Software Foundation, Inc. 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 #include "sysdep.h" 24 #include "bfd.h" 25 #include "bfdlink.h" 26 #include "libbfd.h" 27 #include "elf-bfd.h" 28 #include "elf-vxworks.h" 29 #include "bfd_stdint.h" 30 #include "objalloc.h" 31 #include "hashtab.h" 32 #include "dwarf2.h" 33 34 /* 386 uses REL relocations instead of RELA. */ 35 #define USE_REL 1 36 37 #include "elf/i386.h" 38 39 static reloc_howto_type elf_howto_table[]= 40 { 41 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield, 42 bfd_elf_generic_reloc, "R_386_NONE", 43 TRUE, 0x00000000, 0x00000000, FALSE), 44 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 45 bfd_elf_generic_reloc, "R_386_32", 46 TRUE, 0xffffffff, 0xffffffff, FALSE), 47 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 48 bfd_elf_generic_reloc, "R_386_PC32", 49 TRUE, 0xffffffff, 0xffffffff, TRUE), 50 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 51 bfd_elf_generic_reloc, "R_386_GOT32", 52 TRUE, 0xffffffff, 0xffffffff, FALSE), 53 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 54 bfd_elf_generic_reloc, "R_386_PLT32", 55 TRUE, 0xffffffff, 0xffffffff, TRUE), 56 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 57 bfd_elf_generic_reloc, "R_386_COPY", 58 TRUE, 0xffffffff, 0xffffffff, FALSE), 59 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 60 bfd_elf_generic_reloc, "R_386_GLOB_DAT", 61 TRUE, 0xffffffff, 0xffffffff, FALSE), 62 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 63 bfd_elf_generic_reloc, "R_386_JUMP_SLOT", 64 TRUE, 0xffffffff, 0xffffffff, FALSE), 65 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 66 bfd_elf_generic_reloc, "R_386_RELATIVE", 67 TRUE, 0xffffffff, 0xffffffff, FALSE), 68 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 69 bfd_elf_generic_reloc, "R_386_GOTOFF", 70 TRUE, 0xffffffff, 0xffffffff, FALSE), 71 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 72 bfd_elf_generic_reloc, "R_386_GOTPC", 73 TRUE, 0xffffffff, 0xffffffff, TRUE), 74 75 /* We have a gap in the reloc numbers here. 76 R_386_standard counts the number up to this point, and 77 R_386_ext_offset is the value to subtract from a reloc type of 78 R_386_16 thru R_386_PC8 to form an index into this table. */ 79 #define R_386_standard (R_386_GOTPC + 1) 80 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard) 81 82 /* These relocs are a GNU extension. */ 83 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 84 bfd_elf_generic_reloc, "R_386_TLS_TPOFF", 85 TRUE, 0xffffffff, 0xffffffff, FALSE), 86 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 87 bfd_elf_generic_reloc, "R_386_TLS_IE", 88 TRUE, 0xffffffff, 0xffffffff, FALSE), 89 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 90 bfd_elf_generic_reloc, "R_386_TLS_GOTIE", 91 TRUE, 0xffffffff, 0xffffffff, FALSE), 92 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 93 bfd_elf_generic_reloc, "R_386_TLS_LE", 94 TRUE, 0xffffffff, 0xffffffff, FALSE), 95 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 96 bfd_elf_generic_reloc, "R_386_TLS_GD", 97 TRUE, 0xffffffff, 0xffffffff, FALSE), 98 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 99 bfd_elf_generic_reloc, "R_386_TLS_LDM", 100 TRUE, 0xffffffff, 0xffffffff, FALSE), 101 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 102 bfd_elf_generic_reloc, "R_386_16", 103 TRUE, 0xffff, 0xffff, FALSE), 104 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 105 bfd_elf_generic_reloc, "R_386_PC16", 106 TRUE, 0xffff, 0xffff, TRUE), 107 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 108 bfd_elf_generic_reloc, "R_386_8", 109 TRUE, 0xff, 0xff, FALSE), 110 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, 111 bfd_elf_generic_reloc, "R_386_PC8", 112 TRUE, 0xff, 0xff, TRUE), 113 114 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset) 115 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext) 116 /* These are common with Solaris TLS implementation. */ 117 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 118 bfd_elf_generic_reloc, "R_386_TLS_LDO_32", 119 TRUE, 0xffffffff, 0xffffffff, FALSE), 120 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 121 bfd_elf_generic_reloc, "R_386_TLS_IE_32", 122 TRUE, 0xffffffff, 0xffffffff, FALSE), 123 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 124 bfd_elf_generic_reloc, "R_386_TLS_LE_32", 125 TRUE, 0xffffffff, 0xffffffff, FALSE), 126 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 127 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32", 128 TRUE, 0xffffffff, 0xffffffff, FALSE), 129 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 130 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32", 131 TRUE, 0xffffffff, 0xffffffff, FALSE), 132 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 133 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32", 134 TRUE, 0xffffffff, 0xffffffff, FALSE), 135 EMPTY_HOWTO (38), 136 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 137 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC", 138 TRUE, 0xffffffff, 0xffffffff, FALSE), 139 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 140 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL", 141 FALSE, 0, 0, FALSE), 142 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 143 bfd_elf_generic_reloc, "R_386_TLS_DESC", 144 TRUE, 0xffffffff, 0xffffffff, FALSE), 145 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 146 bfd_elf_generic_reloc, "R_386_IRELATIVE", 147 TRUE, 0xffffffff, 0xffffffff, FALSE), 148 149 /* Another gap. */ 150 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset) 151 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative) 152 153 /* GNU extension to record C++ vtable hierarchy. */ 154 HOWTO (R_386_GNU_VTINHERIT, /* type */ 155 0, /* rightshift */ 156 2, /* size (0 = byte, 1 = short, 2 = long) */ 157 0, /* bitsize */ 158 FALSE, /* pc_relative */ 159 0, /* bitpos */ 160 complain_overflow_dont, /* complain_on_overflow */ 161 NULL, /* special_function */ 162 "R_386_GNU_VTINHERIT", /* name */ 163 FALSE, /* partial_inplace */ 164 0, /* src_mask */ 165 0, /* dst_mask */ 166 FALSE), /* pcrel_offset */ 167 168 /* GNU extension to record C++ vtable member usage. */ 169 HOWTO (R_386_GNU_VTENTRY, /* type */ 170 0, /* rightshift */ 171 2, /* size (0 = byte, 1 = short, 2 = long) */ 172 0, /* bitsize */ 173 FALSE, /* pc_relative */ 174 0, /* bitpos */ 175 complain_overflow_dont, /* complain_on_overflow */ 176 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 177 "R_386_GNU_VTENTRY", /* name */ 178 FALSE, /* partial_inplace */ 179 0, /* src_mask */ 180 0, /* dst_mask */ 181 FALSE) /* pcrel_offset */ 182 183 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset) 184 185 }; 186 187 #ifdef DEBUG_GEN_RELOC 188 #define TRACE(str) \ 189 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) 190 #else 191 #define TRACE(str) 192 #endif 193 194 static reloc_howto_type * 195 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 196 bfd_reloc_code_real_type code) 197 { 198 switch (code) 199 { 200 case BFD_RELOC_NONE: 201 TRACE ("BFD_RELOC_NONE"); 202 return &elf_howto_table[R_386_NONE]; 203 204 case BFD_RELOC_32: 205 TRACE ("BFD_RELOC_32"); 206 return &elf_howto_table[R_386_32]; 207 208 case BFD_RELOC_CTOR: 209 TRACE ("BFD_RELOC_CTOR"); 210 return &elf_howto_table[R_386_32]; 211 212 case BFD_RELOC_32_PCREL: 213 TRACE ("BFD_RELOC_PC32"); 214 return &elf_howto_table[R_386_PC32]; 215 216 case BFD_RELOC_386_GOT32: 217 TRACE ("BFD_RELOC_386_GOT32"); 218 return &elf_howto_table[R_386_GOT32]; 219 220 case BFD_RELOC_386_PLT32: 221 TRACE ("BFD_RELOC_386_PLT32"); 222 return &elf_howto_table[R_386_PLT32]; 223 224 case BFD_RELOC_386_COPY: 225 TRACE ("BFD_RELOC_386_COPY"); 226 return &elf_howto_table[R_386_COPY]; 227 228 case BFD_RELOC_386_GLOB_DAT: 229 TRACE ("BFD_RELOC_386_GLOB_DAT"); 230 return &elf_howto_table[R_386_GLOB_DAT]; 231 232 case BFD_RELOC_386_JUMP_SLOT: 233 TRACE ("BFD_RELOC_386_JUMP_SLOT"); 234 return &elf_howto_table[R_386_JUMP_SLOT]; 235 236 case BFD_RELOC_386_RELATIVE: 237 TRACE ("BFD_RELOC_386_RELATIVE"); 238 return &elf_howto_table[R_386_RELATIVE]; 239 240 case BFD_RELOC_386_GOTOFF: 241 TRACE ("BFD_RELOC_386_GOTOFF"); 242 return &elf_howto_table[R_386_GOTOFF]; 243 244 case BFD_RELOC_386_GOTPC: 245 TRACE ("BFD_RELOC_386_GOTPC"); 246 return &elf_howto_table[R_386_GOTPC]; 247 248 /* These relocs are a GNU extension. */ 249 case BFD_RELOC_386_TLS_TPOFF: 250 TRACE ("BFD_RELOC_386_TLS_TPOFF"); 251 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset]; 252 253 case BFD_RELOC_386_TLS_IE: 254 TRACE ("BFD_RELOC_386_TLS_IE"); 255 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset]; 256 257 case BFD_RELOC_386_TLS_GOTIE: 258 TRACE ("BFD_RELOC_386_TLS_GOTIE"); 259 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset]; 260 261 case BFD_RELOC_386_TLS_LE: 262 TRACE ("BFD_RELOC_386_TLS_LE"); 263 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset]; 264 265 case BFD_RELOC_386_TLS_GD: 266 TRACE ("BFD_RELOC_386_TLS_GD"); 267 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset]; 268 269 case BFD_RELOC_386_TLS_LDM: 270 TRACE ("BFD_RELOC_386_TLS_LDM"); 271 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset]; 272 273 case BFD_RELOC_16: 274 TRACE ("BFD_RELOC_16"); 275 return &elf_howto_table[R_386_16 - R_386_ext_offset]; 276 277 case BFD_RELOC_16_PCREL: 278 TRACE ("BFD_RELOC_16_PCREL"); 279 return &elf_howto_table[R_386_PC16 - R_386_ext_offset]; 280 281 case BFD_RELOC_8: 282 TRACE ("BFD_RELOC_8"); 283 return &elf_howto_table[R_386_8 - R_386_ext_offset]; 284 285 case BFD_RELOC_8_PCREL: 286 TRACE ("BFD_RELOC_8_PCREL"); 287 return &elf_howto_table[R_386_PC8 - R_386_ext_offset]; 288 289 /* Common with Sun TLS implementation. */ 290 case BFD_RELOC_386_TLS_LDO_32: 291 TRACE ("BFD_RELOC_386_TLS_LDO_32"); 292 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset]; 293 294 case BFD_RELOC_386_TLS_IE_32: 295 TRACE ("BFD_RELOC_386_TLS_IE_32"); 296 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset]; 297 298 case BFD_RELOC_386_TLS_LE_32: 299 TRACE ("BFD_RELOC_386_TLS_LE_32"); 300 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset]; 301 302 case BFD_RELOC_386_TLS_DTPMOD32: 303 TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); 304 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset]; 305 306 case BFD_RELOC_386_TLS_DTPOFF32: 307 TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); 308 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset]; 309 310 case BFD_RELOC_386_TLS_TPOFF32: 311 TRACE ("BFD_RELOC_386_TLS_TPOFF32"); 312 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset]; 313 314 case BFD_RELOC_386_TLS_GOTDESC: 315 TRACE ("BFD_RELOC_386_TLS_GOTDESC"); 316 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset]; 317 318 case BFD_RELOC_386_TLS_DESC_CALL: 319 TRACE ("BFD_RELOC_386_TLS_DESC_CALL"); 320 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset]; 321 322 case BFD_RELOC_386_TLS_DESC: 323 TRACE ("BFD_RELOC_386_TLS_DESC"); 324 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset]; 325 326 case BFD_RELOC_386_IRELATIVE: 327 TRACE ("BFD_RELOC_386_IRELATIVE"); 328 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset]; 329 330 case BFD_RELOC_VTABLE_INHERIT: 331 TRACE ("BFD_RELOC_VTABLE_INHERIT"); 332 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset]; 333 334 case BFD_RELOC_VTABLE_ENTRY: 335 TRACE ("BFD_RELOC_VTABLE_ENTRY"); 336 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset]; 337 338 default: 339 break; 340 } 341 342 TRACE ("Unknown"); 343 return 0; 344 } 345 346 static reloc_howto_type * 347 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 348 const char *r_name) 349 { 350 unsigned int i; 351 352 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) 353 if (elf_howto_table[i].name != NULL 354 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 355 return &elf_howto_table[i]; 356 357 return NULL; 358 } 359 360 static reloc_howto_type * 361 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type) 362 { 363 unsigned int indx; 364 365 if ((indx = r_type) >= R_386_standard 366 && ((indx = r_type - R_386_ext_offset) - R_386_standard 367 >= R_386_ext - R_386_standard) 368 && ((indx = r_type - R_386_tls_offset) - R_386_ext 369 >= R_386_irelative - R_386_ext) 370 && ((indx = r_type - R_386_vt_offset) - R_386_irelative 371 >= R_386_vt - R_386_irelative)) 372 { 373 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 374 abfd, (int) r_type); 375 indx = R_386_NONE; 376 } 377 BFD_ASSERT (elf_howto_table [indx].type == r_type); 378 return &elf_howto_table[indx]; 379 } 380 381 static void 382 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, 383 arelent *cache_ptr, 384 Elf_Internal_Rela *dst) 385 { 386 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 387 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type); 388 } 389 390 /* Return whether a symbol name implies a local label. The UnixWare 391 2.1 cc generates temporary symbols that start with .X, so we 392 recognize them here. FIXME: do other SVR4 compilers also use .X?. 393 If so, we should move the .X recognition into 394 _bfd_elf_is_local_label_name. */ 395 396 static bfd_boolean 397 elf_i386_is_local_label_name (bfd *abfd, const char *name) 398 { 399 if (name[0] == '.' && name[1] == 'X') 400 return TRUE; 401 402 return _bfd_elf_is_local_label_name (abfd, name); 403 } 404 405 /* Support for core dump NOTE sections. */ 406 407 static bfd_boolean 408 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 409 { 410 int offset; 411 size_t size; 412 413 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 414 { 415 int pr_version = bfd_get_32 (abfd, note->descdata); 416 417 if (pr_version != 1) 418 return FALSE; 419 420 /* pr_cursig */ 421 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20); 422 423 /* pr_pid */ 424 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24); 425 426 /* pr_reg */ 427 offset = 28; 428 size = bfd_get_32 (abfd, note->descdata + 8); 429 } 430 else 431 { 432 switch (note->descsz) 433 { 434 default: 435 return FALSE; 436 437 case 144: /* Linux/i386 */ 438 /* pr_cursig */ 439 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 440 441 /* pr_pid */ 442 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24); 443 444 /* pr_reg */ 445 offset = 72; 446 size = 68; 447 448 break; 449 } 450 } 451 452 /* Make a ".reg/999" section. */ 453 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 454 size, note->descpos + offset); 455 } 456 457 static bfd_boolean 458 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 459 { 460 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 461 { 462 int pr_version = bfd_get_32 (abfd, note->descdata); 463 464 if (pr_version != 1) 465 return FALSE; 466 467 elf_tdata (abfd)->core_program 468 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); 469 elf_tdata (abfd)->core_command 470 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); 471 } 472 else 473 { 474 switch (note->descsz) 475 { 476 default: 477 return FALSE; 478 479 case 124: /* Linux/i386 elf_prpsinfo. */ 480 elf_tdata (abfd)->core_pid 481 = bfd_get_32 (abfd, note->descdata + 12); 482 elf_tdata (abfd)->core_program 483 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 484 elf_tdata (abfd)->core_command 485 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 486 } 487 } 488 489 /* Note that for some reason, a spurious space is tacked 490 onto the end of the args in some (at least one anyway) 491 implementations, so strip it off if it exists. */ 492 { 493 char *command = elf_tdata (abfd)->core_command; 494 int n = strlen (command); 495 496 if (0 < n && command[n - 1] == ' ') 497 command[n - 1] = '\0'; 498 } 499 500 return TRUE; 501 } 502 503 /* Functions for the i386 ELF linker. 504 505 In order to gain some understanding of code in this file without 506 knowing all the intricate details of the linker, note the 507 following: 508 509 Functions named elf_i386_* are called by external routines, other 510 functions are only called locally. elf_i386_* functions appear 511 in this file more or less in the order in which they are called 512 from external routines. eg. elf_i386_check_relocs is called 513 early in the link process, elf_i386_finish_dynamic_sections is 514 one of the last functions. */ 515 516 517 /* The name of the dynamic interpreter. This is put in the .interp 518 section. */ 519 520 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 521 522 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 523 copying dynamic variables from a shared lib into an app's dynbss 524 section, and instead use a dynamic relocation to point into the 525 shared lib. */ 526 #define ELIMINATE_COPY_RELOCS 1 527 528 /* The size in bytes of an entry in the procedure linkage table. */ 529 530 #define PLT_ENTRY_SIZE 16 531 532 /* The first entry in an absolute procedure linkage table looks like 533 this. See the SVR4 ABI i386 supplement to see how this works. 534 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ 535 536 static const bfd_byte elf_i386_plt0_entry[12] = 537 { 538 0xff, 0x35, /* pushl contents of address */ 539 0, 0, 0, 0, /* replaced with address of .got + 4. */ 540 0xff, 0x25, /* jmp indirect */ 541 0, 0, 0, 0 /* replaced with address of .got + 8. */ 542 }; 543 544 /* Subsequent entries in an absolute procedure linkage table look like 545 this. */ 546 547 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = 548 { 549 0xff, 0x25, /* jmp indirect */ 550 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ 551 0x68, /* pushl immediate */ 552 0, 0, 0, 0, /* replaced with offset into relocation table. */ 553 0xe9, /* jmp relative */ 554 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 555 }; 556 557 /* The first entry in a PIC procedure linkage table look like this. 558 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ 559 560 static const bfd_byte elf_i386_pic_plt0_entry[12] = 561 { 562 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ 563 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */ 564 }; 565 566 /* Subsequent entries in a PIC procedure linkage table look like this. */ 567 568 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = 569 { 570 0xff, 0xa3, /* jmp *offset(%ebx) */ 571 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 572 0x68, /* pushl immediate */ 573 0, 0, 0, 0, /* replaced with offset into relocation table. */ 574 0xe9, /* jmp relative */ 575 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 576 }; 577 578 /* .eh_frame covering the .plt section. */ 579 580 static const bfd_byte elf_i386_eh_frame_plt[] = 581 { 582 #define PLT_CIE_LENGTH 20 583 #define PLT_FDE_LENGTH 36 584 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8 585 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12 586 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 587 0, 0, 0, 0, /* CIE ID */ 588 1, /* CIE version */ 589 'z', 'R', 0, /* Augmentation string */ 590 1, /* Code alignment factor */ 591 0x7c, /* Data alignment factor */ 592 8, /* Return address column */ 593 1, /* Augmentation size */ 594 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 595 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ 596 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ 597 DW_CFA_nop, DW_CFA_nop, 598 599 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 600 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 601 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ 602 0, 0, 0, 0, /* .plt size goes here */ 603 0, /* Augmentation size */ 604 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ 605 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 606 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ 607 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 608 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 609 11, /* Block length */ 610 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ 611 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ 612 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, 613 DW_OP_lit2, DW_OP_shl, DW_OP_plus, 614 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 615 }; 616 617 struct elf_i386_plt_layout 618 { 619 /* The first entry in an absolute procedure linkage table looks like this. */ 620 const bfd_byte *plt0_entry; 621 unsigned int plt0_entry_size; 622 623 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */ 624 unsigned int plt0_got1_offset; 625 unsigned int plt0_got2_offset; 626 627 /* Later entries in an absolute procedure linkage table look like this. */ 628 const bfd_byte *plt_entry; 629 unsigned int plt_entry_size; 630 631 /* Offsets into plt_entry that are to be replaced with... */ 632 unsigned int plt_got_offset; /* ... address of this symbol in .got. */ 633 unsigned int plt_reloc_offset; /* ... offset into relocation table. */ 634 unsigned int plt_plt_offset; /* ... offset to start of .plt. */ 635 636 /* Offset into plt_entry where the initial value of the GOT entry points. */ 637 unsigned int plt_lazy_offset; 638 639 /* The first entry in a PIC procedure linkage table looks like this. */ 640 const bfd_byte *pic_plt0_entry; 641 642 /* Subsequent entries in a PIC procedure linkage table look like this. */ 643 const bfd_byte *pic_plt_entry; 644 645 /* .eh_frame covering the .plt section. */ 646 const bfd_byte *eh_frame_plt; 647 unsigned int eh_frame_plt_size; 648 }; 649 650 #define GET_PLT_ENTRY_SIZE(abfd) \ 651 get_elf_i386_backend_data (abfd)->plt->plt_entry_size 652 653 /* These are the standard parameters. */ 654 static const struct elf_i386_plt_layout elf_i386_plt = 655 { 656 elf_i386_plt0_entry, /* plt0_entry */ 657 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */ 658 2, /* plt0_got1_offset */ 659 8, /* plt0_got2_offset */ 660 elf_i386_plt_entry, /* plt_entry */ 661 PLT_ENTRY_SIZE, /* plt_entry_size */ 662 2, /* plt_got_offset */ 663 7, /* plt_reloc_offset */ 664 12, /* plt_plt_offset */ 665 6, /* plt_lazy_offset */ 666 elf_i386_pic_plt0_entry, /* pic_plt0_entry */ 667 elf_i386_pic_plt_entry, /* pic_plt_entry */ 668 elf_i386_eh_frame_plt, /* eh_frame_plt */ 669 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */ 670 }; 671 672 673 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations 674 for the PLTResolve stub and then for each PLT entry. */ 675 #define PLTRESOLVE_RELOCS_SHLIB 0 676 #define PLTRESOLVE_RELOCS 2 677 #define PLT_NON_JUMP_SLOT_RELOCS 2 678 679 /* Architecture-specific backend data for i386. */ 680 681 struct elf_i386_backend_data 682 { 683 /* Parameters describing PLT generation. */ 684 const struct elf_i386_plt_layout *plt; 685 686 /* Value used to fill the unused bytes of the first PLT entry. */ 687 bfd_byte plt0_pad_byte; 688 689 /* True if the target system is VxWorks. */ 690 int is_vxworks; 691 }; 692 693 #define get_elf_i386_backend_data(abfd) \ 694 ((const struct elf_i386_backend_data *) \ 695 get_elf_backend_data (abfd)->arch_data) 696 697 /* These are the standard parameters. */ 698 static const struct elf_i386_backend_data elf_i386_arch_bed = 699 { 700 &elf_i386_plt, /* plt */ 701 0, /* plt0_pad_byte */ 702 0, /* is_vxworks */ 703 }; 704 705 #define elf_backend_arch_data &elf_i386_arch_bed 706 707 /* i386 ELF linker hash entry. */ 708 709 struct elf_i386_link_hash_entry 710 { 711 struct elf_link_hash_entry elf; 712 713 /* Track dynamic relocs copied for this symbol. */ 714 struct elf_dyn_relocs *dyn_relocs; 715 716 #define GOT_UNKNOWN 0 717 #define GOT_NORMAL 1 718 #define GOT_TLS_GD 2 719 #define GOT_TLS_IE 4 720 #define GOT_TLS_IE_POS 5 721 #define GOT_TLS_IE_NEG 6 722 #define GOT_TLS_IE_BOTH 7 723 #define GOT_TLS_GDESC 8 724 #define GOT_TLS_GD_BOTH_P(type) \ 725 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) 726 #define GOT_TLS_GD_P(type) \ 727 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) 728 #define GOT_TLS_GDESC_P(type) \ 729 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) 730 #define GOT_TLS_GD_ANY_P(type) \ 731 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) 732 unsigned char tls_type; 733 734 /* Offset of the GOTPLT entry reserved for the TLS descriptor, 735 starting at the end of the jump table. */ 736 bfd_vma tlsdesc_got; 737 }; 738 739 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent)) 740 741 struct elf_i386_obj_tdata 742 { 743 struct elf_obj_tdata root; 744 745 /* tls_type for each local got entry. */ 746 char *local_got_tls_type; 747 748 /* GOTPLT entries for TLS descriptors. */ 749 bfd_vma *local_tlsdesc_gotent; 750 }; 751 752 #define elf_i386_tdata(abfd) \ 753 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any) 754 755 #define elf_i386_local_got_tls_type(abfd) \ 756 (elf_i386_tdata (abfd)->local_got_tls_type) 757 758 #define elf_i386_local_tlsdesc_gotent(abfd) \ 759 (elf_i386_tdata (abfd)->local_tlsdesc_gotent) 760 761 #define is_i386_elf(bfd) \ 762 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 763 && elf_tdata (bfd) != NULL \ 764 && elf_object_id (bfd) == I386_ELF_DATA) 765 766 static bfd_boolean 767 elf_i386_mkobject (bfd *abfd) 768 { 769 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata), 770 I386_ELF_DATA); 771 } 772 773 /* i386 ELF linker hash table. */ 774 775 struct elf_i386_link_hash_table 776 { 777 struct elf_link_hash_table elf; 778 779 /* Short-cuts to get to dynamic linker sections. */ 780 asection *sdynbss; 781 asection *srelbss; 782 asection *plt_eh_frame; 783 784 union 785 { 786 bfd_signed_vma refcount; 787 bfd_vma offset; 788 } tls_ldm_got; 789 790 /* The amount of space used by the reserved portion of the sgotplt 791 section, plus whatever space is used by the jump slots. */ 792 bfd_vma sgotplt_jump_table_size; 793 794 /* Small local sym cache. */ 795 struct sym_cache sym_cache; 796 797 /* _TLS_MODULE_BASE_ symbol. */ 798 struct bfd_link_hash_entry *tls_module_base; 799 800 /* Used by local STT_GNU_IFUNC symbols. */ 801 htab_t loc_hash_table; 802 void * loc_hash_memory; 803 804 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */ 805 asection *srelplt2; 806 807 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */ 808 bfd_vma next_tls_desc_index; 809 810 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */ 811 bfd_vma next_jump_slot_index; 812 813 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */ 814 bfd_vma next_irelative_index; 815 }; 816 817 /* Get the i386 ELF linker hash table from a link_info structure. */ 818 819 #define elf_i386_hash_table(p) \ 820 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 821 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL) 822 823 #define elf_i386_compute_jump_table_size(htab) \ 824 ((htab)->next_tls_desc_index * 4) 825 826 /* Create an entry in an i386 ELF linker hash table. */ 827 828 static struct bfd_hash_entry * 829 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry, 830 struct bfd_hash_table *table, 831 const char *string) 832 { 833 /* Allocate the structure if it has not already been allocated by a 834 subclass. */ 835 if (entry == NULL) 836 { 837 entry = (struct bfd_hash_entry *) 838 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry)); 839 if (entry == NULL) 840 return entry; 841 } 842 843 /* Call the allocation method of the superclass. */ 844 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 845 if (entry != NULL) 846 { 847 struct elf_i386_link_hash_entry *eh; 848 849 eh = (struct elf_i386_link_hash_entry *) entry; 850 eh->dyn_relocs = NULL; 851 eh->tls_type = GOT_UNKNOWN; 852 eh->tlsdesc_got = (bfd_vma) -1; 853 } 854 855 return entry; 856 } 857 858 /* Compute a hash of a local hash entry. We use elf_link_hash_entry 859 for local symbol so that we can handle local STT_GNU_IFUNC symbols 860 as global symbol. We reuse indx and dynstr_index for local symbol 861 hash since they aren't used by global symbols in this backend. */ 862 863 static hashval_t 864 elf_i386_local_htab_hash (const void *ptr) 865 { 866 struct elf_link_hash_entry *h 867 = (struct elf_link_hash_entry *) ptr; 868 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); 869 } 870 871 /* Compare local hash entries. */ 872 873 static int 874 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2) 875 { 876 struct elf_link_hash_entry *h1 877 = (struct elf_link_hash_entry *) ptr1; 878 struct elf_link_hash_entry *h2 879 = (struct elf_link_hash_entry *) ptr2; 880 881 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; 882 } 883 884 /* Find and/or create a hash entry for local symbol. */ 885 886 static struct elf_link_hash_entry * 887 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab, 888 bfd *abfd, const Elf_Internal_Rela *rel, 889 bfd_boolean create) 890 { 891 struct elf_i386_link_hash_entry e, *ret; 892 asection *sec = abfd->sections; 893 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, 894 ELF32_R_SYM (rel->r_info)); 895 void **slot; 896 897 e.elf.indx = sec->id; 898 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info); 899 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, 900 create ? INSERT : NO_INSERT); 901 902 if (!slot) 903 return NULL; 904 905 if (*slot) 906 { 907 ret = (struct elf_i386_link_hash_entry *) *slot; 908 return &ret->elf; 909 } 910 911 ret = (struct elf_i386_link_hash_entry *) 912 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, 913 sizeof (struct elf_i386_link_hash_entry)); 914 if (ret) 915 { 916 memset (ret, 0, sizeof (*ret)); 917 ret->elf.indx = sec->id; 918 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info); 919 ret->elf.dynindx = -1; 920 *slot = ret; 921 } 922 return &ret->elf; 923 } 924 925 /* Create an i386 ELF linker hash table. */ 926 927 static struct bfd_link_hash_table * 928 elf_i386_link_hash_table_create (bfd *abfd) 929 { 930 struct elf_i386_link_hash_table *ret; 931 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); 932 933 ret = (struct elf_i386_link_hash_table *) bfd_malloc (amt); 934 if (ret == NULL) 935 return NULL; 936 937 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, 938 elf_i386_link_hash_newfunc, 939 sizeof (struct elf_i386_link_hash_entry), 940 I386_ELF_DATA)) 941 { 942 free (ret); 943 return NULL; 944 } 945 946 ret->sdynbss = NULL; 947 ret->srelbss = NULL; 948 ret->plt_eh_frame = NULL; 949 ret->tls_ldm_got.refcount = 0; 950 ret->next_tls_desc_index = 0; 951 ret->sgotplt_jump_table_size = 0; 952 ret->sym_cache.abfd = NULL; 953 ret->srelplt2 = NULL; 954 ret->tls_module_base = NULL; 955 ret->next_jump_slot_index = 0; 956 ret->next_irelative_index = 0; 957 958 ret->loc_hash_table = htab_try_create (1024, 959 elf_i386_local_htab_hash, 960 elf_i386_local_htab_eq, 961 NULL); 962 ret->loc_hash_memory = objalloc_create (); 963 if (!ret->loc_hash_table || !ret->loc_hash_memory) 964 { 965 free (ret); 966 return NULL; 967 } 968 969 return &ret->elf.root; 970 } 971 972 /* Destroy an i386 ELF linker hash table. */ 973 974 static void 975 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash) 976 { 977 struct elf_i386_link_hash_table *htab 978 = (struct elf_i386_link_hash_table *) hash; 979 980 if (htab->loc_hash_table) 981 htab_delete (htab->loc_hash_table); 982 if (htab->loc_hash_memory) 983 objalloc_free ((struct objalloc *) htab->loc_hash_memory); 984 _bfd_generic_link_hash_table_free (hash); 985 } 986 987 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and 988 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our 989 hash table. */ 990 991 static bfd_boolean 992 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 993 { 994 struct elf_i386_link_hash_table *htab; 995 996 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 997 return FALSE; 998 999 htab = elf_i386_hash_table (info); 1000 if (htab == NULL) 1001 return FALSE; 1002 1003 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 1004 if (!info->shared) 1005 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); 1006 1007 if (!htab->sdynbss 1008 || (!info->shared && !htab->srelbss)) 1009 abort (); 1010 1011 if (get_elf_i386_backend_data (dynobj)->is_vxworks 1012 && !elf_vxworks_create_dynamic_sections (dynobj, info, 1013 &htab->srelplt2)) 1014 return FALSE; 1015 1016 if (!info->no_ld_generated_unwind_info 1017 && bfd_get_section_by_name (dynobj, ".eh_frame") == NULL 1018 && htab->elf.splt != NULL) 1019 { 1020 flagword flags = get_elf_backend_data (dynobj)->dynamic_sec_flags; 1021 htab->plt_eh_frame 1022 = bfd_make_section_with_flags (dynobj, ".eh_frame", 1023 flags | SEC_READONLY); 1024 if (htab->plt_eh_frame == NULL 1025 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2)) 1026 return FALSE; 1027 1028 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt); 1029 htab->plt_eh_frame->contents 1030 = bfd_alloc (dynobj, htab->plt_eh_frame->size); 1031 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt, 1032 sizeof (elf_i386_eh_frame_plt)); 1033 } 1034 1035 return TRUE; 1036 } 1037 1038 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 1039 1040 static void 1041 elf_i386_copy_indirect_symbol (struct bfd_link_info *info, 1042 struct elf_link_hash_entry *dir, 1043 struct elf_link_hash_entry *ind) 1044 { 1045 struct elf_i386_link_hash_entry *edir, *eind; 1046 1047 edir = (struct elf_i386_link_hash_entry *) dir; 1048 eind = (struct elf_i386_link_hash_entry *) ind; 1049 1050 if (eind->dyn_relocs != NULL) 1051 { 1052 if (edir->dyn_relocs != NULL) 1053 { 1054 struct elf_dyn_relocs **pp; 1055 struct elf_dyn_relocs *p; 1056 1057 /* Add reloc counts against the indirect sym to the direct sym 1058 list. Merge any entries against the same section. */ 1059 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 1060 { 1061 struct elf_dyn_relocs *q; 1062 1063 for (q = edir->dyn_relocs; q != NULL; q = q->next) 1064 if (q->sec == p->sec) 1065 { 1066 q->pc_count += p->pc_count; 1067 q->count += p->count; 1068 *pp = p->next; 1069 break; 1070 } 1071 if (q == NULL) 1072 pp = &p->next; 1073 } 1074 *pp = edir->dyn_relocs; 1075 } 1076 1077 edir->dyn_relocs = eind->dyn_relocs; 1078 eind->dyn_relocs = NULL; 1079 } 1080 1081 if (ind->root.type == bfd_link_hash_indirect 1082 && dir->got.refcount <= 0) 1083 { 1084 edir->tls_type = eind->tls_type; 1085 eind->tls_type = GOT_UNKNOWN; 1086 } 1087 1088 if (ELIMINATE_COPY_RELOCS 1089 && ind->root.type != bfd_link_hash_indirect 1090 && dir->dynamic_adjusted) 1091 { 1092 /* If called to transfer flags for a weakdef during processing 1093 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 1094 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 1095 dir->ref_dynamic |= ind->ref_dynamic; 1096 dir->ref_regular |= ind->ref_regular; 1097 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 1098 dir->needs_plt |= ind->needs_plt; 1099 dir->pointer_equality_needed |= ind->pointer_equality_needed; 1100 } 1101 else 1102 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 1103 } 1104 1105 /* Return TRUE if the TLS access code sequence support transition 1106 from R_TYPE. */ 1107 1108 static bfd_boolean 1109 elf_i386_check_tls_transition (bfd *abfd, asection *sec, 1110 bfd_byte *contents, 1111 Elf_Internal_Shdr *symtab_hdr, 1112 struct elf_link_hash_entry **sym_hashes, 1113 unsigned int r_type, 1114 const Elf_Internal_Rela *rel, 1115 const Elf_Internal_Rela *relend) 1116 { 1117 unsigned int val, type; 1118 unsigned long r_symndx; 1119 struct elf_link_hash_entry *h; 1120 bfd_vma offset; 1121 1122 /* Get the section contents. */ 1123 if (contents == NULL) 1124 { 1125 if (elf_section_data (sec)->this_hdr.contents != NULL) 1126 contents = elf_section_data (sec)->this_hdr.contents; 1127 else 1128 { 1129 /* FIXME: How to better handle error condition? */ 1130 if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1131 return FALSE; 1132 1133 /* Cache the section contents for elf_link_input_bfd. */ 1134 elf_section_data (sec)->this_hdr.contents = contents; 1135 } 1136 } 1137 1138 offset = rel->r_offset; 1139 switch (r_type) 1140 { 1141 case R_386_TLS_GD: 1142 case R_386_TLS_LDM: 1143 if (offset < 2 || (rel + 1) >= relend) 1144 return FALSE; 1145 1146 type = bfd_get_8 (abfd, contents + offset - 2); 1147 if (r_type == R_386_TLS_GD) 1148 { 1149 /* Check transition from GD access model. Only 1150 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr 1151 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop 1152 can transit to different access model. */ 1153 if ((offset + 10) > sec->size || 1154 (type != 0x8d && type != 0x04)) 1155 return FALSE; 1156 1157 val = bfd_get_8 (abfd, contents + offset - 1); 1158 if (type == 0x04) 1159 { 1160 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */ 1161 if (offset < 3) 1162 return FALSE; 1163 1164 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d) 1165 return FALSE; 1166 1167 if ((val & 0xc7) != 0x05 || val == (4 << 3)) 1168 return FALSE; 1169 } 1170 else 1171 { 1172 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */ 1173 if ((val & 0xf8) != 0x80 || (val & 7) == 4) 1174 return FALSE; 1175 1176 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90) 1177 return FALSE; 1178 } 1179 } 1180 else 1181 { 1182 /* Check transition from LD access model. Only 1183 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr 1184 can transit to different access model. */ 1185 if (type != 0x8d || (offset + 9) > sec->size) 1186 return FALSE; 1187 1188 val = bfd_get_8 (abfd, contents + offset - 1); 1189 if ((val & 0xf8) != 0x80 || (val & 7) == 4) 1190 return FALSE; 1191 } 1192 1193 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8) 1194 return FALSE; 1195 1196 r_symndx = ELF32_R_SYM (rel[1].r_info); 1197 if (r_symndx < symtab_hdr->sh_info) 1198 return FALSE; 1199 1200 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1201 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr 1202 may be versioned. */ 1203 return (h != NULL 1204 && h->root.root.string != NULL 1205 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32 1206 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32) 1207 && (strncmp (h->root.root.string, "___tls_get_addr", 1208 15) == 0)); 1209 1210 case R_386_TLS_IE: 1211 /* Check transition from IE access model: 1212 movl foo@indntpoff(%rip), %eax 1213 movl foo@indntpoff(%rip), %reg 1214 addl foo@indntpoff(%rip), %reg 1215 */ 1216 1217 if (offset < 1 || (offset + 4) > sec->size) 1218 return FALSE; 1219 1220 /* Check "movl foo@tpoff(%rip), %eax" first. */ 1221 val = bfd_get_8 (abfd, contents + offset - 1); 1222 if (val == 0xa1) 1223 return TRUE; 1224 1225 if (offset < 2) 1226 return FALSE; 1227 1228 /* Check movl|addl foo@tpoff(%rip), %reg. */ 1229 type = bfd_get_8 (abfd, contents + offset - 2); 1230 return ((type == 0x8b || type == 0x03) 1231 && (val & 0xc7) == 0x05); 1232 1233 case R_386_TLS_GOTIE: 1234 case R_386_TLS_IE_32: 1235 /* Check transition from {IE_32,GOTIE} access model: 1236 subl foo@{tpoff,gontoff}(%reg1), %reg2 1237 movl foo@{tpoff,gontoff}(%reg1), %reg2 1238 addl foo@{tpoff,gontoff}(%reg1), %reg2 1239 */ 1240 1241 if (offset < 2 || (offset + 4) > sec->size) 1242 return FALSE; 1243 1244 val = bfd_get_8 (abfd, contents + offset - 1); 1245 if ((val & 0xc0) != 0x80 || (val & 7) == 4) 1246 return FALSE; 1247 1248 type = bfd_get_8 (abfd, contents + offset - 2); 1249 return type == 0x8b || type == 0x2b || type == 0x03; 1250 1251 case R_386_TLS_GOTDESC: 1252 /* Check transition from GDesc access model: 1253 leal x@tlsdesc(%ebx), %eax 1254 1255 Make sure it's a leal adding ebx to a 32-bit offset 1256 into any register, although it's probably almost always 1257 going to be eax. */ 1258 1259 if (offset < 2 || (offset + 4) > sec->size) 1260 return FALSE; 1261 1262 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) 1263 return FALSE; 1264 1265 val = bfd_get_8 (abfd, contents + offset - 1); 1266 return (val & 0xc7) == 0x83; 1267 1268 case R_386_TLS_DESC_CALL: 1269 /* Check transition from GDesc access model: 1270 call *x@tlsdesc(%rax) 1271 */ 1272 if (offset + 2 <= sec->size) 1273 { 1274 /* Make sure that it's a call *x@tlsdesc(%rax). */ 1275 static const unsigned char call[] = { 0xff, 0x10 }; 1276 return memcmp (contents + offset, call, 2) == 0; 1277 } 1278 1279 return FALSE; 1280 1281 default: 1282 abort (); 1283 } 1284 } 1285 1286 /* Return TRUE if the TLS access transition is OK or no transition 1287 will be performed. Update R_TYPE if there is a transition. */ 1288 1289 static bfd_boolean 1290 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd, 1291 asection *sec, bfd_byte *contents, 1292 Elf_Internal_Shdr *symtab_hdr, 1293 struct elf_link_hash_entry **sym_hashes, 1294 unsigned int *r_type, int tls_type, 1295 const Elf_Internal_Rela *rel, 1296 const Elf_Internal_Rela *relend, 1297 struct elf_link_hash_entry *h, 1298 unsigned long r_symndx) 1299 { 1300 unsigned int from_type = *r_type; 1301 unsigned int to_type = from_type; 1302 bfd_boolean check = TRUE; 1303 1304 /* Skip TLS transition for functions. */ 1305 if (h != NULL 1306 && (h->type == STT_FUNC 1307 || h->type == STT_GNU_IFUNC)) 1308 return TRUE; 1309 1310 switch (from_type) 1311 { 1312 case R_386_TLS_GD: 1313 case R_386_TLS_GOTDESC: 1314 case R_386_TLS_DESC_CALL: 1315 case R_386_TLS_IE_32: 1316 case R_386_TLS_IE: 1317 case R_386_TLS_GOTIE: 1318 if (info->executable) 1319 { 1320 if (h == NULL) 1321 to_type = R_386_TLS_LE_32; 1322 else if (from_type != R_386_TLS_IE 1323 && from_type != R_386_TLS_GOTIE) 1324 to_type = R_386_TLS_IE_32; 1325 } 1326 1327 /* When we are called from elf_i386_relocate_section, CONTENTS 1328 isn't NULL and there may be additional transitions based on 1329 TLS_TYPE. */ 1330 if (contents != NULL) 1331 { 1332 unsigned int new_to_type = to_type; 1333 1334 if (info->executable 1335 && h != NULL 1336 && h->dynindx == -1 1337 && (tls_type & GOT_TLS_IE)) 1338 new_to_type = R_386_TLS_LE_32; 1339 1340 if (to_type == R_386_TLS_GD 1341 || to_type == R_386_TLS_GOTDESC 1342 || to_type == R_386_TLS_DESC_CALL) 1343 { 1344 if (tls_type == GOT_TLS_IE_POS) 1345 new_to_type = R_386_TLS_GOTIE; 1346 else if (tls_type & GOT_TLS_IE) 1347 new_to_type = R_386_TLS_IE_32; 1348 } 1349 1350 /* We checked the transition before when we were called from 1351 elf_i386_check_relocs. We only want to check the new 1352 transition which hasn't been checked before. */ 1353 check = new_to_type != to_type && from_type == to_type; 1354 to_type = new_to_type; 1355 } 1356 1357 break; 1358 1359 case R_386_TLS_LDM: 1360 if (info->executable) 1361 to_type = R_386_TLS_LE_32; 1362 break; 1363 1364 default: 1365 return TRUE; 1366 } 1367 1368 /* Return TRUE if there is no transition. */ 1369 if (from_type == to_type) 1370 return TRUE; 1371 1372 /* Check if the transition can be performed. */ 1373 if (check 1374 && ! elf_i386_check_tls_transition (abfd, sec, contents, 1375 symtab_hdr, sym_hashes, 1376 from_type, rel, relend)) 1377 { 1378 reloc_howto_type *from, *to; 1379 const char *name; 1380 1381 from = elf_i386_rtype_to_howto (abfd, from_type); 1382 to = elf_i386_rtype_to_howto (abfd, to_type); 1383 1384 if (h) 1385 name = h->root.root.string; 1386 else 1387 { 1388 struct elf_i386_link_hash_table *htab; 1389 1390 htab = elf_i386_hash_table (info); 1391 if (htab == NULL) 1392 name = "*unknown*"; 1393 else 1394 { 1395 Elf_Internal_Sym *isym; 1396 1397 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1398 abfd, r_symndx); 1399 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); 1400 } 1401 } 1402 1403 (*_bfd_error_handler) 1404 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx " 1405 "in section `%A' failed"), 1406 abfd, sec, from->name, to->name, name, 1407 (unsigned long) rel->r_offset); 1408 bfd_set_error (bfd_error_bad_value); 1409 return FALSE; 1410 } 1411 1412 *r_type = to_type; 1413 return TRUE; 1414 } 1415 1416 /* Look through the relocs for a section during the first phase, and 1417 calculate needed space in the global offset table, procedure linkage 1418 table, and dynamic reloc sections. */ 1419 1420 static bfd_boolean 1421 elf_i386_check_relocs (bfd *abfd, 1422 struct bfd_link_info *info, 1423 asection *sec, 1424 const Elf_Internal_Rela *relocs) 1425 { 1426 struct elf_i386_link_hash_table *htab; 1427 Elf_Internal_Shdr *symtab_hdr; 1428 struct elf_link_hash_entry **sym_hashes; 1429 const Elf_Internal_Rela *rel; 1430 const Elf_Internal_Rela *rel_end; 1431 asection *sreloc; 1432 1433 if (info->relocatable) 1434 return TRUE; 1435 1436 BFD_ASSERT (is_i386_elf (abfd)); 1437 1438 htab = elf_i386_hash_table (info); 1439 if (htab == NULL) 1440 return FALSE; 1441 1442 symtab_hdr = &elf_symtab_hdr (abfd); 1443 sym_hashes = elf_sym_hashes (abfd); 1444 1445 sreloc = NULL; 1446 1447 rel_end = relocs + sec->reloc_count; 1448 for (rel = relocs; rel < rel_end; rel++) 1449 { 1450 unsigned int r_type; 1451 unsigned long r_symndx; 1452 struct elf_link_hash_entry *h; 1453 Elf_Internal_Sym *isym; 1454 const char *name; 1455 1456 r_symndx = ELF32_R_SYM (rel->r_info); 1457 r_type = ELF32_R_TYPE (rel->r_info); 1458 1459 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 1460 { 1461 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), 1462 abfd, 1463 r_symndx); 1464 return FALSE; 1465 } 1466 1467 if (r_symndx < symtab_hdr->sh_info) 1468 { 1469 /* A local symbol. */ 1470 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1471 abfd, r_symndx); 1472 if (isym == NULL) 1473 return FALSE; 1474 1475 /* Check relocation against local STT_GNU_IFUNC symbol. */ 1476 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1477 { 1478 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE); 1479 if (h == NULL) 1480 return FALSE; 1481 1482 /* Fake a STT_GNU_IFUNC symbol. */ 1483 h->type = STT_GNU_IFUNC; 1484 h->def_regular = 1; 1485 h->ref_regular = 1; 1486 h->forced_local = 1; 1487 h->root.type = bfd_link_hash_defined; 1488 } 1489 else 1490 h = NULL; 1491 } 1492 else 1493 { 1494 isym = NULL; 1495 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1496 while (h->root.type == bfd_link_hash_indirect 1497 || h->root.type == bfd_link_hash_warning) 1498 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1499 } 1500 1501 if (h != NULL) 1502 { 1503 /* Create the ifunc sections for static executables. If we 1504 never see an indirect function symbol nor we are building 1505 a static executable, those sections will be empty and 1506 won't appear in output. */ 1507 switch (r_type) 1508 { 1509 default: 1510 break; 1511 1512 case R_386_32: 1513 case R_386_PC32: 1514 case R_386_PLT32: 1515 case R_386_GOT32: 1516 case R_386_GOTOFF: 1517 if (htab->elf.dynobj == NULL) 1518 htab->elf.dynobj = abfd; 1519 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info)) 1520 return FALSE; 1521 break; 1522 } 1523 1524 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle 1525 it here if it is defined in a non-shared object. */ 1526 if (h->type == STT_GNU_IFUNC 1527 && h->def_regular) 1528 { 1529 /* It is referenced by a non-shared object. */ 1530 h->ref_regular = 1; 1531 h->needs_plt = 1; 1532 1533 /* STT_GNU_IFUNC symbol must go through PLT. */ 1534 h->plt.refcount += 1; 1535 1536 /* STT_GNU_IFUNC needs dynamic sections. */ 1537 if (htab->elf.dynobj == NULL) 1538 htab->elf.dynobj = abfd; 1539 1540 switch (r_type) 1541 { 1542 default: 1543 if (h->root.root.string) 1544 name = h->root.root.string; 1545 else 1546 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, 1547 NULL); 1548 (*_bfd_error_handler) 1549 (_("%B: relocation %s against STT_GNU_IFUNC " 1550 "symbol `%s' isn't handled by %s"), abfd, 1551 elf_howto_table[r_type].name, 1552 name, __FUNCTION__); 1553 bfd_set_error (bfd_error_bad_value); 1554 return FALSE; 1555 1556 case R_386_32: 1557 h->non_got_ref = 1; 1558 h->pointer_equality_needed = 1; 1559 if (info->shared) 1560 { 1561 /* We must copy these reloc types into the 1562 output file. Create a reloc section in 1563 dynobj and make room for this reloc. */ 1564 sreloc = _bfd_elf_create_ifunc_dyn_reloc 1565 (abfd, info, sec, sreloc, 1566 &((struct elf_i386_link_hash_entry *) h)->dyn_relocs); 1567 if (sreloc == NULL) 1568 return FALSE; 1569 } 1570 break; 1571 1572 case R_386_PC32: 1573 h->non_got_ref = 1; 1574 break; 1575 1576 case R_386_PLT32: 1577 break; 1578 1579 case R_386_GOT32: 1580 case R_386_GOTOFF: 1581 h->got.refcount += 1; 1582 if (htab->elf.sgot == NULL 1583 && !_bfd_elf_create_got_section (htab->elf.dynobj, 1584 info)) 1585 return FALSE; 1586 break; 1587 } 1588 1589 continue; 1590 } 1591 } 1592 1593 if (! elf_i386_tls_transition (info, abfd, sec, NULL, 1594 symtab_hdr, sym_hashes, 1595 &r_type, GOT_UNKNOWN, 1596 rel, rel_end, h, r_symndx)) 1597 return FALSE; 1598 1599 switch (r_type) 1600 { 1601 case R_386_TLS_LDM: 1602 htab->tls_ldm_got.refcount += 1; 1603 goto create_got; 1604 1605 case R_386_PLT32: 1606 /* This symbol requires a procedure linkage table entry. We 1607 actually build the entry in adjust_dynamic_symbol, 1608 because this might be a case of linking PIC code which is 1609 never referenced by a dynamic object, in which case we 1610 don't need to generate a procedure linkage table entry 1611 after all. */ 1612 1613 /* If this is a local symbol, we resolve it directly without 1614 creating a procedure linkage table entry. */ 1615 if (h == NULL) 1616 continue; 1617 1618 h->needs_plt = 1; 1619 h->plt.refcount += 1; 1620 break; 1621 1622 case R_386_TLS_IE_32: 1623 case R_386_TLS_IE: 1624 case R_386_TLS_GOTIE: 1625 if (!info->executable) 1626 info->flags |= DF_STATIC_TLS; 1627 /* Fall through */ 1628 1629 case R_386_GOT32: 1630 case R_386_TLS_GD: 1631 case R_386_TLS_GOTDESC: 1632 case R_386_TLS_DESC_CALL: 1633 /* This symbol requires a global offset table entry. */ 1634 { 1635 int tls_type, old_tls_type; 1636 1637 switch (r_type) 1638 { 1639 default: 1640 case R_386_GOT32: tls_type = GOT_NORMAL; break; 1641 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; 1642 case R_386_TLS_GOTDESC: 1643 case R_386_TLS_DESC_CALL: 1644 tls_type = GOT_TLS_GDESC; break; 1645 case R_386_TLS_IE_32: 1646 if (ELF32_R_TYPE (rel->r_info) == r_type) 1647 tls_type = GOT_TLS_IE_NEG; 1648 else 1649 /* If this is a GD->IE transition, we may use either of 1650 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ 1651 tls_type = GOT_TLS_IE; 1652 break; 1653 case R_386_TLS_IE: 1654 case R_386_TLS_GOTIE: 1655 tls_type = GOT_TLS_IE_POS; break; 1656 } 1657 1658 if (h != NULL) 1659 { 1660 h->got.refcount += 1; 1661 old_tls_type = elf_i386_hash_entry(h)->tls_type; 1662 } 1663 else 1664 { 1665 bfd_signed_vma *local_got_refcounts; 1666 1667 /* This is a global offset table entry for a local symbol. */ 1668 local_got_refcounts = elf_local_got_refcounts (abfd); 1669 if (local_got_refcounts == NULL) 1670 { 1671 bfd_size_type size; 1672 1673 size = symtab_hdr->sh_info; 1674 size *= (sizeof (bfd_signed_vma) 1675 + sizeof (bfd_vma) + sizeof(char)); 1676 local_got_refcounts = (bfd_signed_vma *) 1677 bfd_zalloc (abfd, size); 1678 if (local_got_refcounts == NULL) 1679 return FALSE; 1680 elf_local_got_refcounts (abfd) = local_got_refcounts; 1681 elf_i386_local_tlsdesc_gotent (abfd) 1682 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); 1683 elf_i386_local_got_tls_type (abfd) 1684 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); 1685 } 1686 local_got_refcounts[r_symndx] += 1; 1687 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx]; 1688 } 1689 1690 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) 1691 tls_type |= old_tls_type; 1692 /* If a TLS symbol is accessed using IE at least once, 1693 there is no point to use dynamic model for it. */ 1694 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN 1695 && (! GOT_TLS_GD_ANY_P (old_tls_type) 1696 || (tls_type & GOT_TLS_IE) == 0)) 1697 { 1698 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type)) 1699 tls_type = old_tls_type; 1700 else if (GOT_TLS_GD_ANY_P (old_tls_type) 1701 && GOT_TLS_GD_ANY_P (tls_type)) 1702 tls_type |= old_tls_type; 1703 else 1704 { 1705 if (h) 1706 name = h->root.root.string; 1707 else 1708 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, 1709 NULL); 1710 (*_bfd_error_handler) 1711 (_("%B: `%s' accessed both as normal and " 1712 "thread local symbol"), 1713 abfd, name); 1714 return FALSE; 1715 } 1716 } 1717 1718 if (old_tls_type != tls_type) 1719 { 1720 if (h != NULL) 1721 elf_i386_hash_entry (h)->tls_type = tls_type; 1722 else 1723 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type; 1724 } 1725 } 1726 /* Fall through */ 1727 1728 case R_386_GOTOFF: 1729 case R_386_GOTPC: 1730 create_got: 1731 if (htab->elf.sgot == NULL) 1732 { 1733 if (htab->elf.dynobj == NULL) 1734 htab->elf.dynobj = abfd; 1735 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info)) 1736 return FALSE; 1737 } 1738 if (r_type != R_386_TLS_IE) 1739 break; 1740 /* Fall through */ 1741 1742 case R_386_TLS_LE_32: 1743 case R_386_TLS_LE: 1744 if (info->executable) 1745 break; 1746 info->flags |= DF_STATIC_TLS; 1747 /* Fall through */ 1748 1749 case R_386_32: 1750 case R_386_PC32: 1751 if (h != NULL && info->executable) 1752 { 1753 /* If this reloc is in a read-only section, we might 1754 need a copy reloc. We can't check reliably at this 1755 stage whether the section is read-only, as input 1756 sections have not yet been mapped to output sections. 1757 Tentatively set the flag for now, and correct in 1758 adjust_dynamic_symbol. */ 1759 h->non_got_ref = 1; 1760 1761 /* We may need a .plt entry if the function this reloc 1762 refers to is in a shared lib. */ 1763 h->plt.refcount += 1; 1764 if (r_type != R_386_PC32) 1765 h->pointer_equality_needed = 1; 1766 } 1767 1768 /* If we are creating a shared library, and this is a reloc 1769 against a global symbol, or a non PC relative reloc 1770 against a local symbol, then we need to copy the reloc 1771 into the shared library. However, if we are linking with 1772 -Bsymbolic, we do not need to copy a reloc against a 1773 global symbol which is defined in an object we are 1774 including in the link (i.e., DEF_REGULAR is set). At 1775 this point we have not seen all the input files, so it is 1776 possible that DEF_REGULAR is not set now but will be set 1777 later (it is never cleared). In case of a weak definition, 1778 DEF_REGULAR may be cleared later by a strong definition in 1779 a shared library. We account for that possibility below by 1780 storing information in the relocs_copied field of the hash 1781 table entry. A similar situation occurs when creating 1782 shared libraries and symbol visibility changes render the 1783 symbol local. 1784 1785 If on the other hand, we are creating an executable, we 1786 may need to keep relocations for symbols satisfied by a 1787 dynamic library if we manage to avoid copy relocs for the 1788 symbol. */ 1789 if ((info->shared 1790 && (sec->flags & SEC_ALLOC) != 0 1791 && (r_type != R_386_PC32 1792 || (h != NULL 1793 && (! SYMBOLIC_BIND (info, h) 1794 || h->root.type == bfd_link_hash_defweak 1795 || !h->def_regular)))) 1796 || (ELIMINATE_COPY_RELOCS 1797 && !info->shared 1798 && (sec->flags & SEC_ALLOC) != 0 1799 && h != NULL 1800 && (h->root.type == bfd_link_hash_defweak 1801 || !h->def_regular))) 1802 { 1803 struct elf_dyn_relocs *p; 1804 struct elf_dyn_relocs **head; 1805 1806 /* We must copy these reloc types into the output file. 1807 Create a reloc section in dynobj and make room for 1808 this reloc. */ 1809 if (sreloc == NULL) 1810 { 1811 if (htab->elf.dynobj == NULL) 1812 htab->elf.dynobj = abfd; 1813 1814 sreloc = _bfd_elf_make_dynamic_reloc_section 1815 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE); 1816 1817 if (sreloc == NULL) 1818 return FALSE; 1819 } 1820 1821 /* If this is a global symbol, we count the number of 1822 relocations we need for this symbol. */ 1823 if (h != NULL) 1824 { 1825 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs; 1826 } 1827 else 1828 { 1829 /* Track dynamic relocs needed for local syms too. 1830 We really need local syms available to do this 1831 easily. Oh well. */ 1832 void **vpp; 1833 asection *s; 1834 1835 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1836 abfd, r_symndx); 1837 if (isym == NULL) 1838 return FALSE; 1839 1840 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 1841 if (s == NULL) 1842 s = sec; 1843 1844 vpp = &elf_section_data (s)->local_dynrel; 1845 head = (struct elf_dyn_relocs **)vpp; 1846 } 1847 1848 p = *head; 1849 if (p == NULL || p->sec != sec) 1850 { 1851 bfd_size_type amt = sizeof *p; 1852 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj, 1853 amt); 1854 if (p == NULL) 1855 return FALSE; 1856 p->next = *head; 1857 *head = p; 1858 p->sec = sec; 1859 p->count = 0; 1860 p->pc_count = 0; 1861 } 1862 1863 p->count += 1; 1864 if (r_type == R_386_PC32) 1865 p->pc_count += 1; 1866 } 1867 break; 1868 1869 /* This relocation describes the C++ object vtable hierarchy. 1870 Reconstruct it for later use during GC. */ 1871 case R_386_GNU_VTINHERIT: 1872 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1873 return FALSE; 1874 break; 1875 1876 /* This relocation describes which C++ vtable entries are actually 1877 used. Record for later use during GC. */ 1878 case R_386_GNU_VTENTRY: 1879 BFD_ASSERT (h != NULL); 1880 if (h != NULL 1881 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 1882 return FALSE; 1883 break; 1884 1885 default: 1886 break; 1887 } 1888 } 1889 1890 return TRUE; 1891 } 1892 1893 /* Return the section that should be marked against GC for a given 1894 relocation. */ 1895 1896 static asection * 1897 elf_i386_gc_mark_hook (asection *sec, 1898 struct bfd_link_info *info, 1899 Elf_Internal_Rela *rel, 1900 struct elf_link_hash_entry *h, 1901 Elf_Internal_Sym *sym) 1902 { 1903 if (h != NULL) 1904 switch (ELF32_R_TYPE (rel->r_info)) 1905 { 1906 case R_386_GNU_VTINHERIT: 1907 case R_386_GNU_VTENTRY: 1908 return NULL; 1909 } 1910 1911 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1912 } 1913 1914 /* Update the got entry reference counts for the section being removed. */ 1915 1916 static bfd_boolean 1917 elf_i386_gc_sweep_hook (bfd *abfd, 1918 struct bfd_link_info *info, 1919 asection *sec, 1920 const Elf_Internal_Rela *relocs) 1921 { 1922 struct elf_i386_link_hash_table *htab; 1923 Elf_Internal_Shdr *symtab_hdr; 1924 struct elf_link_hash_entry **sym_hashes; 1925 bfd_signed_vma *local_got_refcounts; 1926 const Elf_Internal_Rela *rel, *relend; 1927 1928 if (info->relocatable) 1929 return TRUE; 1930 1931 htab = elf_i386_hash_table (info); 1932 if (htab == NULL) 1933 return FALSE; 1934 1935 elf_section_data (sec)->local_dynrel = NULL; 1936 1937 symtab_hdr = &elf_symtab_hdr (abfd); 1938 sym_hashes = elf_sym_hashes (abfd); 1939 local_got_refcounts = elf_local_got_refcounts (abfd); 1940 1941 relend = relocs + sec->reloc_count; 1942 for (rel = relocs; rel < relend; rel++) 1943 { 1944 unsigned long r_symndx; 1945 unsigned int r_type; 1946 struct elf_link_hash_entry *h = NULL; 1947 1948 r_symndx = ELF32_R_SYM (rel->r_info); 1949 if (r_symndx >= symtab_hdr->sh_info) 1950 { 1951 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1952 while (h->root.type == bfd_link_hash_indirect 1953 || h->root.type == bfd_link_hash_warning) 1954 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1955 } 1956 else 1957 { 1958 /* A local symbol. */ 1959 Elf_Internal_Sym *isym; 1960 1961 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1962 abfd, r_symndx); 1963 1964 /* Check relocation against local STT_GNU_IFUNC symbol. */ 1965 if (isym != NULL 1966 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1967 { 1968 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE); 1969 if (h == NULL) 1970 abort (); 1971 } 1972 } 1973 1974 if (h) 1975 { 1976 struct elf_i386_link_hash_entry *eh; 1977 struct elf_dyn_relocs **pp; 1978 struct elf_dyn_relocs *p; 1979 1980 eh = (struct elf_i386_link_hash_entry *) h; 1981 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1982 if (p->sec == sec) 1983 { 1984 /* Everything must go for SEC. */ 1985 *pp = p->next; 1986 break; 1987 } 1988 } 1989 1990 r_type = ELF32_R_TYPE (rel->r_info); 1991 if (! elf_i386_tls_transition (info, abfd, sec, NULL, 1992 symtab_hdr, sym_hashes, 1993 &r_type, GOT_UNKNOWN, 1994 rel, relend, h, r_symndx)) 1995 return FALSE; 1996 1997 switch (r_type) 1998 { 1999 case R_386_TLS_LDM: 2000 if (htab->tls_ldm_got.refcount > 0) 2001 htab->tls_ldm_got.refcount -= 1; 2002 break; 2003 2004 case R_386_TLS_GD: 2005 case R_386_TLS_GOTDESC: 2006 case R_386_TLS_DESC_CALL: 2007 case R_386_TLS_IE_32: 2008 case R_386_TLS_IE: 2009 case R_386_TLS_GOTIE: 2010 case R_386_GOT32: 2011 if (h != NULL) 2012 { 2013 if (h->got.refcount > 0) 2014 h->got.refcount -= 1; 2015 if (h->type == STT_GNU_IFUNC) 2016 { 2017 if (h->plt.refcount > 0) 2018 h->plt.refcount -= 1; 2019 } 2020 } 2021 else if (local_got_refcounts != NULL) 2022 { 2023 if (local_got_refcounts[r_symndx] > 0) 2024 local_got_refcounts[r_symndx] -= 1; 2025 } 2026 break; 2027 2028 case R_386_32: 2029 case R_386_PC32: 2030 if (info->shared 2031 && (h == NULL || h->type != STT_GNU_IFUNC)) 2032 break; 2033 /* Fall through */ 2034 2035 case R_386_PLT32: 2036 if (h != NULL) 2037 { 2038 if (h->plt.refcount > 0) 2039 h->plt.refcount -= 1; 2040 } 2041 break; 2042 2043 case R_386_GOTOFF: 2044 if (h != NULL && h->type == STT_GNU_IFUNC) 2045 { 2046 if (h->got.refcount > 0) 2047 h->got.refcount -= 1; 2048 if (h->plt.refcount > 0) 2049 h->plt.refcount -= 1; 2050 } 2051 break; 2052 2053 default: 2054 break; 2055 } 2056 } 2057 2058 return TRUE; 2059 } 2060 2061 /* Adjust a symbol defined by a dynamic object and referenced by a 2062 regular object. The current definition is in some section of the 2063 dynamic object, but we're not including those sections. We have to 2064 change the definition to something the rest of the link can 2065 understand. */ 2066 2067 static bfd_boolean 2068 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info, 2069 struct elf_link_hash_entry *h) 2070 { 2071 struct elf_i386_link_hash_table *htab; 2072 asection *s; 2073 2074 /* STT_GNU_IFUNC symbol must go through PLT. */ 2075 if (h->type == STT_GNU_IFUNC) 2076 { 2077 if (h->plt.refcount <= 0) 2078 { 2079 h->plt.offset = (bfd_vma) -1; 2080 h->needs_plt = 0; 2081 } 2082 return TRUE; 2083 } 2084 2085 /* If this is a function, put it in the procedure linkage table. We 2086 will fill in the contents of the procedure linkage table later, 2087 when we know the address of the .got section. */ 2088 if (h->type == STT_FUNC 2089 || h->needs_plt) 2090 { 2091 if (h->plt.refcount <= 0 2092 || SYMBOL_CALLS_LOCAL (info, h) 2093 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 2094 && h->root.type == bfd_link_hash_undefweak)) 2095 { 2096 /* This case can occur if we saw a PLT32 reloc in an input 2097 file, but the symbol was never referred to by a dynamic 2098 object, or if all references were garbage collected. In 2099 such a case, we don't actually need to build a procedure 2100 linkage table, and we can just do a PC32 reloc instead. */ 2101 h->plt.offset = (bfd_vma) -1; 2102 h->needs_plt = 0; 2103 } 2104 2105 return TRUE; 2106 } 2107 else 2108 /* It's possible that we incorrectly decided a .plt reloc was 2109 needed for an R_386_PC32 reloc to a non-function sym in 2110 check_relocs. We can't decide accurately between function and 2111 non-function syms in check-relocs; Objects loaded later in 2112 the link may change h->type. So fix it now. */ 2113 h->plt.offset = (bfd_vma) -1; 2114 2115 /* If this is a weak symbol, and there is a real definition, the 2116 processor independent code will have arranged for us to see the 2117 real definition first, and we can just use the same value. */ 2118 if (h->u.weakdef != NULL) 2119 { 2120 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 2121 || h->u.weakdef->root.type == bfd_link_hash_defweak); 2122 h->root.u.def.section = h->u.weakdef->root.u.def.section; 2123 h->root.u.def.value = h->u.weakdef->root.u.def.value; 2124 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 2125 h->non_got_ref = h->u.weakdef->non_got_ref; 2126 return TRUE; 2127 } 2128 2129 /* This is a reference to a symbol defined by a dynamic object which 2130 is not a function. */ 2131 2132 /* If we are creating a shared library, we must presume that the 2133 only references to the symbol are via the global offset table. 2134 For such cases we need not do anything here; the relocations will 2135 be handled correctly by relocate_section. */ 2136 if (info->shared) 2137 return TRUE; 2138 2139 /* If there are no references to this symbol that do not use the 2140 GOT, we don't need to generate a copy reloc. */ 2141 if (!h->non_got_ref) 2142 return TRUE; 2143 2144 /* If -z nocopyreloc was given, we won't generate them either. */ 2145 if (info->nocopyreloc) 2146 { 2147 h->non_got_ref = 0; 2148 return TRUE; 2149 } 2150 2151 htab = elf_i386_hash_table (info); 2152 if (htab == NULL) 2153 return FALSE; 2154 2155 /* If there aren't any dynamic relocs in read-only sections, then 2156 we can keep the dynamic relocs and avoid the copy reloc. This 2157 doesn't work on VxWorks, where we can not have dynamic relocations 2158 (other than copy and jump slot relocations) in an executable. */ 2159 if (ELIMINATE_COPY_RELOCS 2160 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks) 2161 { 2162 struct elf_i386_link_hash_entry * eh; 2163 struct elf_dyn_relocs *p; 2164 2165 eh = (struct elf_i386_link_hash_entry *) h; 2166 for (p = eh->dyn_relocs; p != NULL; p = p->next) 2167 { 2168 s = p->sec->output_section; 2169 if (s != NULL && (s->flags & SEC_READONLY) != 0) 2170 break; 2171 } 2172 2173 if (p == NULL) 2174 { 2175 h->non_got_ref = 0; 2176 return TRUE; 2177 } 2178 } 2179 2180 if (h->size == 0) 2181 { 2182 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 2183 h->root.root.string); 2184 return TRUE; 2185 } 2186 2187 /* We must allocate the symbol in our .dynbss section, which will 2188 become part of the .bss section of the executable. There will be 2189 an entry for this symbol in the .dynsym section. The dynamic 2190 object will contain position independent code, so all references 2191 from the dynamic object to this symbol will go through the global 2192 offset table. The dynamic linker will use the .dynsym entry to 2193 determine the address it must put in the global offset table, so 2194 both the dynamic object and the regular object will refer to the 2195 same memory location for the variable. */ 2196 2197 /* We must generate a R_386_COPY reloc to tell the dynamic linker to 2198 copy the initial value out of the dynamic object and into the 2199 runtime process image. */ 2200 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 2201 { 2202 htab->srelbss->size += sizeof (Elf32_External_Rel); 2203 h->needs_copy = 1; 2204 } 2205 2206 s = htab->sdynbss; 2207 2208 return _bfd_elf_adjust_dynamic_copy (h, s); 2209 } 2210 2211 /* Allocate space in .plt, .got and associated reloc sections for 2212 dynamic relocs. */ 2213 2214 static bfd_boolean 2215 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) 2216 { 2217 struct bfd_link_info *info; 2218 struct elf_i386_link_hash_table *htab; 2219 struct elf_i386_link_hash_entry *eh; 2220 struct elf_dyn_relocs *p; 2221 unsigned plt_entry_size; 2222 2223 if (h->root.type == bfd_link_hash_indirect) 2224 return TRUE; 2225 2226 eh = (struct elf_i386_link_hash_entry *) h; 2227 2228 info = (struct bfd_link_info *) inf; 2229 htab = elf_i386_hash_table (info); 2230 if (htab == NULL) 2231 return FALSE; 2232 2233 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd); 2234 2235 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it 2236 here if it is defined and referenced in a non-shared object. */ 2237 if (h->type == STT_GNU_IFUNC 2238 && h->def_regular) 2239 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs, 2240 plt_entry_size, 4); 2241 else if (htab->elf.dynamic_sections_created 2242 && h->plt.refcount > 0) 2243 { 2244 /* Make sure this symbol is output as a dynamic symbol. 2245 Undefined weak syms won't yet be marked as dynamic. */ 2246 if (h->dynindx == -1 2247 && !h->forced_local) 2248 { 2249 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2250 return FALSE; 2251 } 2252 2253 if (info->shared 2254 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 2255 { 2256 asection *s = htab->elf.splt; 2257 2258 /* If this is the first .plt entry, make room for the special 2259 first entry. */ 2260 if (s->size == 0) 2261 s->size += plt_entry_size; 2262 2263 h->plt.offset = s->size; 2264 2265 /* If this symbol is not defined in a regular file, and we are 2266 not generating a shared library, then set the symbol to this 2267 location in the .plt. This is required to make function 2268 pointers compare as equal between the normal executable and 2269 the shared library. */ 2270 if (! info->shared 2271 && !h->def_regular) 2272 { 2273 h->root.u.def.section = s; 2274 h->root.u.def.value = h->plt.offset; 2275 } 2276 2277 /* Make room for this entry. */ 2278 s->size += plt_entry_size; 2279 2280 /* We also need to make an entry in the .got.plt section, which 2281 will be placed in the .got section by the linker script. */ 2282 htab->elf.sgotplt->size += 4; 2283 2284 /* We also need to make an entry in the .rel.plt section. */ 2285 htab->elf.srelplt->size += sizeof (Elf32_External_Rel); 2286 htab->elf.srelplt->reloc_count++; 2287 2288 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks 2289 && !info->shared) 2290 { 2291 /* VxWorks has a second set of relocations for each PLT entry 2292 in executables. They go in a separate relocation section, 2293 which is processed by the kernel loader. */ 2294 2295 /* There are two relocations for the initial PLT entry: an 2296 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an 2297 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ 2298 2299 if (h->plt.offset == plt_entry_size) 2300 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); 2301 2302 /* There are two extra relocations for each subsequent PLT entry: 2303 an R_386_32 relocation for the GOT entry, and an R_386_32 2304 relocation for the PLT entry. */ 2305 2306 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); 2307 } 2308 } 2309 else 2310 { 2311 h->plt.offset = (bfd_vma) -1; 2312 h->needs_plt = 0; 2313 } 2314 } 2315 else 2316 { 2317 h->plt.offset = (bfd_vma) -1; 2318 h->needs_plt = 0; 2319 } 2320 2321 eh->tlsdesc_got = (bfd_vma) -1; 2322 2323 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary, 2324 make it a R_386_TLS_LE_32 requiring no TLS entry. */ 2325 if (h->got.refcount > 0 2326 && info->executable 2327 && h->dynindx == -1 2328 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE)) 2329 h->got.offset = (bfd_vma) -1; 2330 else if (h->got.refcount > 0) 2331 { 2332 asection *s; 2333 bfd_boolean dyn; 2334 int tls_type = elf_i386_hash_entry(h)->tls_type; 2335 2336 /* Make sure this symbol is output as a dynamic symbol. 2337 Undefined weak syms won't yet be marked as dynamic. */ 2338 if (h->dynindx == -1 2339 && !h->forced_local) 2340 { 2341 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2342 return FALSE; 2343 } 2344 2345 s = htab->elf.sgot; 2346 if (GOT_TLS_GDESC_P (tls_type)) 2347 { 2348 eh->tlsdesc_got = htab->elf.sgotplt->size 2349 - elf_i386_compute_jump_table_size (htab); 2350 htab->elf.sgotplt->size += 8; 2351 h->got.offset = (bfd_vma) -2; 2352 } 2353 if (! GOT_TLS_GDESC_P (tls_type) 2354 || GOT_TLS_GD_P (tls_type)) 2355 { 2356 h->got.offset = s->size; 2357 s->size += 4; 2358 /* R_386_TLS_GD needs 2 consecutive GOT slots. */ 2359 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH) 2360 s->size += 4; 2361 } 2362 dyn = htab->elf.dynamic_sections_created; 2363 /* R_386_TLS_IE_32 needs one dynamic relocation, 2364 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, 2365 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we 2366 need two), R_386_TLS_GD needs one if local symbol and two if 2367 global. */ 2368 if (tls_type == GOT_TLS_IE_BOTH) 2369 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel); 2370 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) 2371 || (tls_type & GOT_TLS_IE)) 2372 htab->elf.srelgot->size += sizeof (Elf32_External_Rel); 2373 else if (GOT_TLS_GD_P (tls_type)) 2374 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel); 2375 else if (! GOT_TLS_GDESC_P (tls_type) 2376 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2377 || h->root.type != bfd_link_hash_undefweak) 2378 && (info->shared 2379 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 2380 htab->elf.srelgot->size += sizeof (Elf32_External_Rel); 2381 if (GOT_TLS_GDESC_P (tls_type)) 2382 htab->elf.srelplt->size += sizeof (Elf32_External_Rel); 2383 } 2384 else 2385 h->got.offset = (bfd_vma) -1; 2386 2387 if (eh->dyn_relocs == NULL) 2388 return TRUE; 2389 2390 /* In the shared -Bsymbolic case, discard space allocated for 2391 dynamic pc-relative relocs against symbols which turn out to be 2392 defined in regular objects. For the normal shared case, discard 2393 space for pc-relative relocs that have become local due to symbol 2394 visibility changes. */ 2395 2396 if (info->shared) 2397 { 2398 /* The only reloc that uses pc_count is R_386_PC32, which will 2399 appear on a call or on something like ".long foo - .". We 2400 want calls to protected symbols to resolve directly to the 2401 function rather than going via the plt. If people want 2402 function pointer comparisons to work as expected then they 2403 should avoid writing assembly like ".long foo - .". */ 2404 if (SYMBOL_CALLS_LOCAL (info, h)) 2405 { 2406 struct elf_dyn_relocs **pp; 2407 2408 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 2409 { 2410 p->count -= p->pc_count; 2411 p->pc_count = 0; 2412 if (p->count == 0) 2413 *pp = p->next; 2414 else 2415 pp = &p->next; 2416 } 2417 } 2418 2419 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks) 2420 { 2421 struct elf_dyn_relocs **pp; 2422 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 2423 { 2424 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0) 2425 *pp = p->next; 2426 else 2427 pp = &p->next; 2428 } 2429 } 2430 2431 /* Also discard relocs on undefined weak syms with non-default 2432 visibility. */ 2433 if (eh->dyn_relocs != NULL 2434 && h->root.type == bfd_link_hash_undefweak) 2435 { 2436 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 2437 eh->dyn_relocs = NULL; 2438 2439 /* Make sure undefined weak symbols are output as a dynamic 2440 symbol in PIEs. */ 2441 else if (h->dynindx == -1 2442 && !h->forced_local) 2443 { 2444 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2445 return FALSE; 2446 } 2447 } 2448 } 2449 else if (ELIMINATE_COPY_RELOCS) 2450 { 2451 /* For the non-shared case, discard space for relocs against 2452 symbols which turn out to need copy relocs or are not 2453 dynamic. */ 2454 2455 if (!h->non_got_ref 2456 && ((h->def_dynamic 2457 && !h->def_regular) 2458 || (htab->elf.dynamic_sections_created 2459 && (h->root.type == bfd_link_hash_undefweak 2460 || h->root.type == bfd_link_hash_undefined)))) 2461 { 2462 /* Make sure this symbol is output as a dynamic symbol. 2463 Undefined weak syms won't yet be marked as dynamic. */ 2464 if (h->dynindx == -1 2465 && !h->forced_local) 2466 { 2467 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2468 return FALSE; 2469 } 2470 2471 /* If that succeeded, we know we'll be keeping all the 2472 relocs. */ 2473 if (h->dynindx != -1) 2474 goto keep; 2475 } 2476 2477 eh->dyn_relocs = NULL; 2478 2479 keep: ; 2480 } 2481 2482 /* Finally, allocate space. */ 2483 for (p = eh->dyn_relocs; p != NULL; p = p->next) 2484 { 2485 asection *sreloc; 2486 2487 sreloc = elf_section_data (p->sec)->sreloc; 2488 2489 BFD_ASSERT (sreloc != NULL); 2490 sreloc->size += p->count * sizeof (Elf32_External_Rel); 2491 } 2492 2493 return TRUE; 2494 } 2495 2496 /* Allocate space in .plt, .got and associated reloc sections for 2497 local dynamic relocs. */ 2498 2499 static bfd_boolean 2500 elf_i386_allocate_local_dynrelocs (void **slot, void *inf) 2501 { 2502 struct elf_link_hash_entry *h 2503 = (struct elf_link_hash_entry *) *slot; 2504 2505 if (h->type != STT_GNU_IFUNC 2506 || !h->def_regular 2507 || !h->ref_regular 2508 || !h->forced_local 2509 || h->root.type != bfd_link_hash_defined) 2510 abort (); 2511 2512 return elf_i386_allocate_dynrelocs (h, inf); 2513 } 2514 2515 /* Find any dynamic relocs that apply to read-only sections. */ 2516 2517 static bfd_boolean 2518 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) 2519 { 2520 struct elf_i386_link_hash_entry *eh; 2521 struct elf_dyn_relocs *p; 2522 2523 /* Skip local IFUNC symbols. */ 2524 if (h->forced_local && h->type == STT_GNU_IFUNC) 2525 return TRUE; 2526 2527 eh = (struct elf_i386_link_hash_entry *) h; 2528 for (p = eh->dyn_relocs; p != NULL; p = p->next) 2529 { 2530 asection *s = p->sec->output_section; 2531 2532 if (s != NULL && (s->flags & SEC_READONLY) != 0) 2533 { 2534 struct bfd_link_info *info = (struct bfd_link_info *) inf; 2535 2536 info->flags |= DF_TEXTREL; 2537 2538 if (info->warn_shared_textrel && info->shared) 2539 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"), 2540 p->sec->owner, h->root.root.string, 2541 p->sec); 2542 2543 /* Not an error, just cut short the traversal. */ 2544 return FALSE; 2545 } 2546 } 2547 return TRUE; 2548 } 2549 2550 /* Set the sizes of the dynamic sections. */ 2551 2552 static bfd_boolean 2553 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 2554 { 2555 struct elf_i386_link_hash_table *htab; 2556 bfd *dynobj; 2557 asection *s; 2558 bfd_boolean relocs; 2559 bfd *ibfd; 2560 2561 htab = elf_i386_hash_table (info); 2562 if (htab == NULL) 2563 return FALSE; 2564 dynobj = htab->elf.dynobj; 2565 if (dynobj == NULL) 2566 abort (); 2567 2568 if (htab->elf.dynamic_sections_created) 2569 { 2570 /* Set the contents of the .interp section to the interpreter. */ 2571 if (info->executable) 2572 { 2573 s = bfd_get_section_by_name (dynobj, ".interp"); 2574 if (s == NULL) 2575 abort (); 2576 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 2577 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 2578 } 2579 } 2580 2581 /* Set up .got offsets for local syms, and space for local dynamic 2582 relocs. */ 2583 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 2584 { 2585 bfd_signed_vma *local_got; 2586 bfd_signed_vma *end_local_got; 2587 char *local_tls_type; 2588 bfd_vma *local_tlsdesc_gotent; 2589 bfd_size_type locsymcount; 2590 Elf_Internal_Shdr *symtab_hdr; 2591 asection *srel; 2592 2593 if (! is_i386_elf (ibfd)) 2594 continue; 2595 2596 for (s = ibfd->sections; s != NULL; s = s->next) 2597 { 2598 struct elf_dyn_relocs *p; 2599 2600 for (p = ((struct elf_dyn_relocs *) 2601 elf_section_data (s)->local_dynrel); 2602 p != NULL; 2603 p = p->next) 2604 { 2605 if (!bfd_is_abs_section (p->sec) 2606 && bfd_is_abs_section (p->sec->output_section)) 2607 { 2608 /* Input section has been discarded, either because 2609 it is a copy of a linkonce section or due to 2610 linker script /DISCARD/, so we'll be discarding 2611 the relocs too. */ 2612 } 2613 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks 2614 && strcmp (p->sec->output_section->name, 2615 ".tls_vars") == 0) 2616 { 2617 /* Relocations in vxworks .tls_vars sections are 2618 handled specially by the loader. */ 2619 } 2620 else if (p->count != 0) 2621 { 2622 srel = elf_section_data (p->sec)->sreloc; 2623 srel->size += p->count * sizeof (Elf32_External_Rel); 2624 if ((p->sec->output_section->flags & SEC_READONLY) != 0 2625 && (info->flags & DF_TEXTREL) == 0) 2626 { 2627 info->flags |= DF_TEXTREL; 2628 if (info->warn_shared_textrel && info->shared) 2629 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"), 2630 p->sec->owner, p->sec); 2631 } 2632 } 2633 } 2634 } 2635 2636 local_got = elf_local_got_refcounts (ibfd); 2637 if (!local_got) 2638 continue; 2639 2640 symtab_hdr = &elf_symtab_hdr (ibfd); 2641 locsymcount = symtab_hdr->sh_info; 2642 end_local_got = local_got + locsymcount; 2643 local_tls_type = elf_i386_local_got_tls_type (ibfd); 2644 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd); 2645 s = htab->elf.sgot; 2646 srel = htab->elf.srelgot; 2647 for (; local_got < end_local_got; 2648 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) 2649 { 2650 *local_tlsdesc_gotent = (bfd_vma) -1; 2651 if (*local_got > 0) 2652 { 2653 if (GOT_TLS_GDESC_P (*local_tls_type)) 2654 { 2655 *local_tlsdesc_gotent = htab->elf.sgotplt->size 2656 - elf_i386_compute_jump_table_size (htab); 2657 htab->elf.sgotplt->size += 8; 2658 *local_got = (bfd_vma) -2; 2659 } 2660 if (! GOT_TLS_GDESC_P (*local_tls_type) 2661 || GOT_TLS_GD_P (*local_tls_type)) 2662 { 2663 *local_got = s->size; 2664 s->size += 4; 2665 if (GOT_TLS_GD_P (*local_tls_type) 2666 || *local_tls_type == GOT_TLS_IE_BOTH) 2667 s->size += 4; 2668 } 2669 if (info->shared 2670 || GOT_TLS_GD_ANY_P (*local_tls_type) 2671 || (*local_tls_type & GOT_TLS_IE)) 2672 { 2673 if (*local_tls_type == GOT_TLS_IE_BOTH) 2674 srel->size += 2 * sizeof (Elf32_External_Rel); 2675 else if (GOT_TLS_GD_P (*local_tls_type) 2676 || ! GOT_TLS_GDESC_P (*local_tls_type)) 2677 srel->size += sizeof (Elf32_External_Rel); 2678 if (GOT_TLS_GDESC_P (*local_tls_type)) 2679 htab->elf.srelplt->size += sizeof (Elf32_External_Rel); 2680 } 2681 } 2682 else 2683 *local_got = (bfd_vma) -1; 2684 } 2685 } 2686 2687 if (htab->tls_ldm_got.refcount > 0) 2688 { 2689 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM 2690 relocs. */ 2691 htab->tls_ldm_got.offset = htab->elf.sgot->size; 2692 htab->elf.sgot->size += 8; 2693 htab->elf.srelgot->size += sizeof (Elf32_External_Rel); 2694 } 2695 else 2696 htab->tls_ldm_got.offset = -1; 2697 2698 /* Allocate global sym .plt and .got entries, and space for global 2699 sym dynamic relocs. */ 2700 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info); 2701 2702 /* Allocate .plt and .got entries, and space for local symbols. */ 2703 htab_traverse (htab->loc_hash_table, 2704 elf_i386_allocate_local_dynrelocs, 2705 info); 2706 2707 /* For every jump slot reserved in the sgotplt, reloc_count is 2708 incremented. However, when we reserve space for TLS descriptors, 2709 it's not incremented, so in order to compute the space reserved 2710 for them, it suffices to multiply the reloc count by the jump 2711 slot size. 2712 2713 PR ld/13302: We start next_irelative_index at the end of .rela.plt 2714 so that R_386_IRELATIVE entries come last. */ 2715 if (htab->elf.srelplt) 2716 { 2717 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count; 2718 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4; 2719 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1; 2720 } 2721 else if (htab->elf.irelplt) 2722 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1; 2723 2724 2725 if (htab->elf.sgotplt) 2726 { 2727 struct elf_link_hash_entry *got; 2728 got = elf_link_hash_lookup (elf_hash_table (info), 2729 "_GLOBAL_OFFSET_TABLE_", 2730 FALSE, FALSE, FALSE); 2731 2732 /* Don't allocate .got.plt section if there are no GOT nor PLT 2733 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */ 2734 if ((got == NULL 2735 || !got->ref_regular_nonweak) 2736 && (htab->elf.sgotplt->size 2737 == get_elf_backend_data (output_bfd)->got_header_size) 2738 && (htab->elf.splt == NULL 2739 || htab->elf.splt->size == 0) 2740 && (htab->elf.sgot == NULL 2741 || htab->elf.sgot->size == 0) 2742 && (htab->elf.iplt == NULL 2743 || htab->elf.iplt->size == 0) 2744 && (htab->elf.igotplt == NULL 2745 || htab->elf.igotplt->size == 0)) 2746 htab->elf.sgotplt->size = 0; 2747 } 2748 2749 /* We now have determined the sizes of the various dynamic sections. 2750 Allocate memory for them. */ 2751 relocs = FALSE; 2752 for (s = dynobj->sections; s != NULL; s = s->next) 2753 { 2754 bfd_boolean strip_section = TRUE; 2755 2756 if ((s->flags & SEC_LINKER_CREATED) == 0) 2757 continue; 2758 2759 if (s == htab->elf.splt 2760 || s == htab->elf.sgot 2761 || s == htab->elf.sgotplt 2762 || s == htab->elf.iplt 2763 || s == htab->elf.igotplt 2764 || s == htab->sdynbss) 2765 { 2766 /* Strip this section if we don't need it; see the 2767 comment below. */ 2768 /* We'd like to strip these sections if they aren't needed, but if 2769 we've exported dynamic symbols from them we must leave them. 2770 It's too late to tell BFD to get rid of the symbols. */ 2771 2772 if (htab->elf.hplt != NULL) 2773 strip_section = FALSE; 2774 } 2775 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel")) 2776 { 2777 if (s->size != 0 2778 && s != htab->elf.srelplt 2779 && s != htab->srelplt2) 2780 relocs = TRUE; 2781 2782 /* We use the reloc_count field as a counter if we need 2783 to copy relocs into the output file. */ 2784 s->reloc_count = 0; 2785 } 2786 else 2787 { 2788 /* It's not one of our sections, so don't allocate space. */ 2789 continue; 2790 } 2791 2792 if (s->size == 0) 2793 { 2794 /* If we don't need this section, strip it from the 2795 output file. This is mostly to handle .rel.bss and 2796 .rel.plt. We must create both sections in 2797 create_dynamic_sections, because they must be created 2798 before the linker maps input sections to output 2799 sections. The linker does that before 2800 adjust_dynamic_symbol is called, and it is that 2801 function which decides whether anything needs to go 2802 into these sections. */ 2803 if (strip_section) 2804 s->flags |= SEC_EXCLUDE; 2805 continue; 2806 } 2807 2808 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2809 continue; 2810 2811 /* Allocate memory for the section contents. We use bfd_zalloc 2812 here in case unused entries are not reclaimed before the 2813 section's contents are written out. This should not happen, 2814 but this way if it does, we get a R_386_NONE reloc instead 2815 of garbage. */ 2816 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size); 2817 if (s->contents == NULL) 2818 return FALSE; 2819 } 2820 2821 if (htab->plt_eh_frame != NULL 2822 && htab->elf.splt != NULL 2823 && htab->elf.splt->size != 0 2824 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0) 2825 bfd_put_32 (dynobj, htab->elf.splt->size, 2826 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET); 2827 2828 if (htab->elf.dynamic_sections_created) 2829 { 2830 /* Add some entries to the .dynamic section. We fill in the 2831 values later, in elf_i386_finish_dynamic_sections, but we 2832 must add the entries now so that we get the correct size for 2833 the .dynamic section. The DT_DEBUG entry is filled in by the 2834 dynamic linker and used by the debugger. */ 2835 #define add_dynamic_entry(TAG, VAL) \ 2836 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2837 2838 if (info->executable) 2839 { 2840 if (!add_dynamic_entry (DT_DEBUG, 0)) 2841 return FALSE; 2842 } 2843 2844 if (htab->elf.splt->size != 0) 2845 { 2846 if (!add_dynamic_entry (DT_PLTGOT, 0) 2847 || !add_dynamic_entry (DT_PLTRELSZ, 0) 2848 || !add_dynamic_entry (DT_PLTREL, DT_REL) 2849 || !add_dynamic_entry (DT_JMPREL, 0)) 2850 return FALSE; 2851 } 2852 2853 if (relocs) 2854 { 2855 if (!add_dynamic_entry (DT_REL, 0) 2856 || !add_dynamic_entry (DT_RELSZ, 0) 2857 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) 2858 return FALSE; 2859 2860 /* If any dynamic relocs apply to a read-only section, 2861 then we need a DT_TEXTREL entry. */ 2862 if ((info->flags & DF_TEXTREL) == 0) 2863 elf_link_hash_traverse (&htab->elf, 2864 elf_i386_readonly_dynrelocs, info); 2865 2866 if ((info->flags & DF_TEXTREL) != 0) 2867 { 2868 if (!add_dynamic_entry (DT_TEXTREL, 0)) 2869 return FALSE; 2870 } 2871 } 2872 if (get_elf_i386_backend_data (output_bfd)->is_vxworks 2873 && !elf_vxworks_add_dynamic_entries (output_bfd, info)) 2874 return FALSE; 2875 } 2876 #undef add_dynamic_entry 2877 2878 return TRUE; 2879 } 2880 2881 static bfd_boolean 2882 elf_i386_always_size_sections (bfd *output_bfd, 2883 struct bfd_link_info *info) 2884 { 2885 asection *tls_sec = elf_hash_table (info)->tls_sec; 2886 2887 if (tls_sec) 2888 { 2889 struct elf_link_hash_entry *tlsbase; 2890 2891 tlsbase = elf_link_hash_lookup (elf_hash_table (info), 2892 "_TLS_MODULE_BASE_", 2893 FALSE, FALSE, FALSE); 2894 2895 if (tlsbase && tlsbase->type == STT_TLS) 2896 { 2897 struct elf_i386_link_hash_table *htab; 2898 struct bfd_link_hash_entry *bh = NULL; 2899 const struct elf_backend_data *bed 2900 = get_elf_backend_data (output_bfd); 2901 2902 htab = elf_i386_hash_table (info); 2903 if (htab == NULL) 2904 return FALSE; 2905 2906 if (!(_bfd_generic_link_add_one_symbol 2907 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, 2908 tls_sec, 0, NULL, FALSE, 2909 bed->collect, &bh))) 2910 return FALSE; 2911 2912 htab->tls_module_base = bh; 2913 2914 tlsbase = (struct elf_link_hash_entry *)bh; 2915 tlsbase->def_regular = 1; 2916 tlsbase->other = STV_HIDDEN; 2917 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); 2918 } 2919 } 2920 2921 return TRUE; 2922 } 2923 2924 /* Set the correct type for an x86 ELF section. We do this by the 2925 section name, which is a hack, but ought to work. */ 2926 2927 static bfd_boolean 2928 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, 2929 Elf_Internal_Shdr *hdr, 2930 asection *sec) 2931 { 2932 const char *name; 2933 2934 name = bfd_get_section_name (abfd, sec); 2935 2936 /* This is an ugly, but unfortunately necessary hack that is 2937 needed when producing EFI binaries on x86. It tells 2938 elf.c:elf_fake_sections() not to consider ".reloc" as a section 2939 containing ELF relocation info. We need this hack in order to 2940 be able to generate ELF binaries that can be translated into 2941 EFI applications (which are essentially COFF objects). Those 2942 files contain a COFF ".reloc" section inside an ELFNN object, 2943 which would normally cause BFD to segfault because it would 2944 attempt to interpret this section as containing relocation 2945 entries for section "oc". With this hack enabled, ".reloc" 2946 will be treated as a normal data section, which will avoid the 2947 segfault. However, you won't be able to create an ELFNN binary 2948 with a section named "oc" that needs relocations, but that's 2949 the kind of ugly side-effects you get when detecting section 2950 types based on their names... In practice, this limitation is 2951 unlikely to bite. */ 2952 if (strcmp (name, ".reloc") == 0) 2953 hdr->sh_type = SHT_PROGBITS; 2954 2955 return TRUE; 2956 } 2957 2958 /* _TLS_MODULE_BASE_ needs to be treated especially when linking 2959 executables. Rather than setting it to the beginning of the TLS 2960 section, we have to set it to the end. This function may be called 2961 multiple times, it is idempotent. */ 2962 2963 static void 2964 elf_i386_set_tls_module_base (struct bfd_link_info *info) 2965 { 2966 struct elf_i386_link_hash_table *htab; 2967 struct bfd_link_hash_entry *base; 2968 2969 if (!info->executable) 2970 return; 2971 2972 htab = elf_i386_hash_table (info); 2973 if (htab == NULL) 2974 return; 2975 2976 base = htab->tls_module_base; 2977 if (base == NULL) 2978 return; 2979 2980 base->u.def.value = htab->elf.tls_size; 2981 } 2982 2983 /* Return the base VMA address which should be subtracted from real addresses 2984 when resolving @dtpoff relocation. 2985 This is PT_TLS segment p_vaddr. */ 2986 2987 static bfd_vma 2988 elf_i386_dtpoff_base (struct bfd_link_info *info) 2989 { 2990 /* If tls_sec is NULL, we should have signalled an error already. */ 2991 if (elf_hash_table (info)->tls_sec == NULL) 2992 return 0; 2993 return elf_hash_table (info)->tls_sec->vma; 2994 } 2995 2996 /* Return the relocation value for @tpoff relocation 2997 if STT_TLS virtual address is ADDRESS. */ 2998 2999 static bfd_vma 3000 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address) 3001 { 3002 struct elf_link_hash_table *htab = elf_hash_table (info); 3003 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); 3004 bfd_vma static_tls_size; 3005 3006 /* If tls_sec is NULL, we should have signalled an error already. */ 3007 if (htab->tls_sec == NULL) 3008 return 0; 3009 3010 /* Consider special static TLS alignment requirements. */ 3011 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); 3012 return static_tls_size + htab->tls_sec->vma - address; 3013 } 3014 3015 /* Relocate an i386 ELF section. */ 3016 3017 static bfd_boolean 3018 elf_i386_relocate_section (bfd *output_bfd, 3019 struct bfd_link_info *info, 3020 bfd *input_bfd, 3021 asection *input_section, 3022 bfd_byte *contents, 3023 Elf_Internal_Rela *relocs, 3024 Elf_Internal_Sym *local_syms, 3025 asection **local_sections) 3026 { 3027 struct elf_i386_link_hash_table *htab; 3028 Elf_Internal_Shdr *symtab_hdr; 3029 struct elf_link_hash_entry **sym_hashes; 3030 bfd_vma *local_got_offsets; 3031 bfd_vma *local_tlsdesc_gotents; 3032 Elf_Internal_Rela *rel; 3033 Elf_Internal_Rela *relend; 3034 bfd_boolean is_vxworks_tls; 3035 unsigned plt_entry_size; 3036 3037 BFD_ASSERT (is_i386_elf (input_bfd)); 3038 3039 htab = elf_i386_hash_table (info); 3040 if (htab == NULL) 3041 return FALSE; 3042 symtab_hdr = &elf_symtab_hdr (input_bfd); 3043 sym_hashes = elf_sym_hashes (input_bfd); 3044 local_got_offsets = elf_local_got_offsets (input_bfd); 3045 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd); 3046 /* We have to handle relocations in vxworks .tls_vars sections 3047 specially, because the dynamic loader is 'weird'. */ 3048 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks 3049 && info->shared 3050 && !strcmp (input_section->output_section->name, 3051 ".tls_vars")); 3052 3053 elf_i386_set_tls_module_base (info); 3054 3055 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd); 3056 3057 rel = relocs; 3058 relend = relocs + input_section->reloc_count; 3059 for (; rel < relend; rel++) 3060 { 3061 unsigned int r_type; 3062 reloc_howto_type *howto; 3063 unsigned long r_symndx; 3064 struct elf_link_hash_entry *h; 3065 Elf_Internal_Sym *sym; 3066 asection *sec; 3067 bfd_vma off, offplt; 3068 bfd_vma relocation; 3069 bfd_boolean unresolved_reloc; 3070 bfd_reloc_status_type r; 3071 unsigned int indx; 3072 int tls_type; 3073 3074 r_type = ELF32_R_TYPE (rel->r_info); 3075 if (r_type == R_386_GNU_VTINHERIT 3076 || r_type == R_386_GNU_VTENTRY) 3077 continue; 3078 3079 if ((indx = r_type) >= R_386_standard 3080 && ((indx = r_type - R_386_ext_offset) - R_386_standard 3081 >= R_386_ext - R_386_standard) 3082 && ((indx = r_type - R_386_tls_offset) - R_386_ext 3083 >= R_386_irelative - R_386_ext)) 3084 { 3085 (*_bfd_error_handler) 3086 (_("%B: unrecognized relocation (0x%x) in section `%A'"), 3087 input_bfd, input_section, r_type); 3088 bfd_set_error (bfd_error_bad_value); 3089 return FALSE; 3090 } 3091 howto = elf_howto_table + indx; 3092 3093 r_symndx = ELF32_R_SYM (rel->r_info); 3094 h = NULL; 3095 sym = NULL; 3096 sec = NULL; 3097 unresolved_reloc = FALSE; 3098 if (r_symndx < symtab_hdr->sh_info) 3099 { 3100 sym = local_syms + r_symndx; 3101 sec = local_sections[r_symndx]; 3102 relocation = (sec->output_section->vma 3103 + sec->output_offset 3104 + sym->st_value); 3105 3106 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION 3107 && ((sec->flags & SEC_MERGE) != 0 3108 || (info->relocatable 3109 && sec->output_offset != 0))) 3110 { 3111 bfd_vma addend; 3112 bfd_byte *where = contents + rel->r_offset; 3113 3114 switch (howto->size) 3115 { 3116 case 0: 3117 addend = bfd_get_8 (input_bfd, where); 3118 if (howto->pc_relative) 3119 { 3120 addend = (addend ^ 0x80) - 0x80; 3121 addend += 1; 3122 } 3123 break; 3124 case 1: 3125 addend = bfd_get_16 (input_bfd, where); 3126 if (howto->pc_relative) 3127 { 3128 addend = (addend ^ 0x8000) - 0x8000; 3129 addend += 2; 3130 } 3131 break; 3132 case 2: 3133 addend = bfd_get_32 (input_bfd, where); 3134 if (howto->pc_relative) 3135 { 3136 addend = (addend ^ 0x80000000) - 0x80000000; 3137 addend += 4; 3138 } 3139 break; 3140 default: 3141 abort (); 3142 } 3143 3144 if (info->relocatable) 3145 addend += sec->output_offset; 3146 else 3147 { 3148 asection *msec = sec; 3149 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, 3150 addend); 3151 addend -= relocation; 3152 addend += msec->output_section->vma + msec->output_offset; 3153 } 3154 3155 switch (howto->size) 3156 { 3157 case 0: 3158 /* FIXME: overflow checks. */ 3159 if (howto->pc_relative) 3160 addend -= 1; 3161 bfd_put_8 (input_bfd, addend, where); 3162 break; 3163 case 1: 3164 if (howto->pc_relative) 3165 addend -= 2; 3166 bfd_put_16 (input_bfd, addend, where); 3167 break; 3168 case 2: 3169 if (howto->pc_relative) 3170 addend -= 4; 3171 bfd_put_32 (input_bfd, addend, where); 3172 break; 3173 } 3174 } 3175 else if (!info->relocatable 3176 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 3177 { 3178 /* Relocate against local STT_GNU_IFUNC symbol. */ 3179 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel, 3180 FALSE); 3181 if (h == NULL) 3182 abort (); 3183 3184 /* Set STT_GNU_IFUNC symbol value. */ 3185 h->root.u.def.value = sym->st_value; 3186 h->root.u.def.section = sec; 3187 } 3188 } 3189 else 3190 { 3191 bfd_boolean warned ATTRIBUTE_UNUSED; 3192 3193 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 3194 r_symndx, symtab_hdr, sym_hashes, 3195 h, sec, relocation, 3196 unresolved_reloc, warned); 3197 } 3198 3199 if (sec != NULL && elf_discarded_section (sec)) 3200 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 3201 rel, relend, howto, contents); 3202 3203 if (info->relocatable) 3204 continue; 3205 3206 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle 3207 it here if it is defined in a non-shared object. */ 3208 if (h != NULL 3209 && h->type == STT_GNU_IFUNC 3210 && h->def_regular) 3211 { 3212 asection *plt, *gotplt, *base_got; 3213 bfd_vma plt_index; 3214 const char *name; 3215 3216 if ((input_section->flags & SEC_ALLOC) == 0 3217 || h->plt.offset == (bfd_vma) -1) 3218 abort (); 3219 3220 /* STT_GNU_IFUNC symbol must go through PLT. */ 3221 if (htab->elf.splt != NULL) 3222 { 3223 plt = htab->elf.splt; 3224 gotplt = htab->elf.sgotplt; 3225 } 3226 else 3227 { 3228 plt = htab->elf.iplt; 3229 gotplt = htab->elf.igotplt; 3230 } 3231 3232 relocation = (plt->output_section->vma 3233 + plt->output_offset + h->plt.offset); 3234 3235 switch (r_type) 3236 { 3237 default: 3238 if (h->root.root.string) 3239 name = h->root.root.string; 3240 else 3241 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, 3242 NULL); 3243 (*_bfd_error_handler) 3244 (_("%B: relocation %s against STT_GNU_IFUNC " 3245 "symbol `%s' isn't handled by %s"), input_bfd, 3246 elf_howto_table[r_type].name, 3247 name, __FUNCTION__); 3248 bfd_set_error (bfd_error_bad_value); 3249 return FALSE; 3250 3251 case R_386_32: 3252 /* Generate dynamic relcoation only when there is a 3253 non-GOT reference in a shared object. */ 3254 if (info->shared && h->non_got_ref) 3255 { 3256 Elf_Internal_Rela outrel; 3257 bfd_byte *loc; 3258 asection *sreloc; 3259 bfd_vma offset; 3260 bfd_boolean relocate; 3261 3262 /* Need a dynamic relocation to get the real function 3263 adddress. */ 3264 offset = _bfd_elf_section_offset (output_bfd, 3265 info, 3266 input_section, 3267 rel->r_offset); 3268 if (offset == (bfd_vma) -1 3269 || offset == (bfd_vma) -2) 3270 abort (); 3271 3272 outrel.r_offset = (input_section->output_section->vma 3273 + input_section->output_offset 3274 + offset); 3275 3276 if (h->dynindx == -1 3277 || h->forced_local 3278 || info->executable) 3279 { 3280 /* This symbol is resolved locally. */ 3281 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 3282 relocate = TRUE; 3283 } 3284 else 3285 { 3286 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 3287 relocate = FALSE; 3288 } 3289 3290 sreloc = htab->elf.irelifunc; 3291 loc = sreloc->contents; 3292 loc += (sreloc->reloc_count++ 3293 * sizeof (Elf32_External_Rel)); 3294 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3295 3296 /* If this reloc is against an external symbol, we 3297 do not want to fiddle with the addend. Otherwise, 3298 we need to include the symbol value so that it 3299 becomes an addend for the dynamic reloc. For an 3300 internal symbol, we have updated addend. */ 3301 if (! relocate) 3302 continue; 3303 } 3304 /* FALLTHROUGH */ 3305 case R_386_PC32: 3306 case R_386_PLT32: 3307 goto do_relocation; 3308 3309 case R_386_GOT32: 3310 base_got = htab->elf.sgot; 3311 off = h->got.offset; 3312 3313 if (base_got == NULL) 3314 abort (); 3315 3316 if (off == (bfd_vma) -1) 3317 { 3318 /* We can't use h->got.offset here to save state, or 3319 even just remember the offset, as finish_dynamic_symbol 3320 would use that as offset into .got. */ 3321 3322 if (htab->elf.splt != NULL) 3323 { 3324 plt_index = h->plt.offset / plt_entry_size - 1; 3325 off = (plt_index + 3) * 4; 3326 base_got = htab->elf.sgotplt; 3327 } 3328 else 3329 { 3330 plt_index = h->plt.offset / plt_entry_size; 3331 off = plt_index * 4; 3332 base_got = htab->elf.igotplt; 3333 } 3334 3335 if (h->dynindx == -1 3336 || h->forced_local 3337 || info->symbolic) 3338 { 3339 /* This references the local defitionion. We must 3340 initialize this entry in the global offset table. 3341 Since the offset must always be a multiple of 8, 3342 we use the least significant bit to record 3343 whether we have initialized it already. 3344 3345 When doing a dynamic link, we create a .rela.got 3346 relocation entry to initialize the value. This 3347 is done in the finish_dynamic_symbol routine. */ 3348 if ((off & 1) != 0) 3349 off &= ~1; 3350 else 3351 { 3352 bfd_put_32 (output_bfd, relocation, 3353 base_got->contents + off); 3354 h->got.offset |= 1; 3355 } 3356 } 3357 3358 relocation = off; 3359 3360 /* Adjust for static executables. */ 3361 if (htab->elf.splt == NULL) 3362 relocation += gotplt->output_offset; 3363 } 3364 else 3365 { 3366 relocation = (base_got->output_section->vma 3367 + base_got->output_offset + off 3368 - gotplt->output_section->vma 3369 - gotplt->output_offset); 3370 /* Adjust for static executables. */ 3371 if (htab->elf.splt == NULL) 3372 relocation += gotplt->output_offset; 3373 } 3374 3375 goto do_relocation; 3376 3377 case R_386_GOTOFF: 3378 relocation -= (gotplt->output_section->vma 3379 + gotplt->output_offset); 3380 goto do_relocation; 3381 } 3382 } 3383 3384 switch (r_type) 3385 { 3386 case R_386_GOT32: 3387 /* Relocation is to the entry for this symbol in the global 3388 offset table. */ 3389 if (htab->elf.sgot == NULL) 3390 abort (); 3391 3392 if (h != NULL) 3393 { 3394 bfd_boolean dyn; 3395 3396 off = h->got.offset; 3397 dyn = htab->elf.dynamic_sections_created; 3398 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 3399 || (info->shared 3400 && SYMBOL_REFERENCES_LOCAL (info, h)) 3401 || (ELF_ST_VISIBILITY (h->other) 3402 && h->root.type == bfd_link_hash_undefweak)) 3403 { 3404 /* This is actually a static link, or it is a 3405 -Bsymbolic link and the symbol is defined 3406 locally, or the symbol was forced to be local 3407 because of a version file. We must initialize 3408 this entry in the global offset table. Since the 3409 offset must always be a multiple of 4, we use the 3410 least significant bit to record whether we have 3411 initialized it already. 3412 3413 When doing a dynamic link, we create a .rel.got 3414 relocation entry to initialize the value. This 3415 is done in the finish_dynamic_symbol routine. */ 3416 if ((off & 1) != 0) 3417 off &= ~1; 3418 else 3419 { 3420 bfd_put_32 (output_bfd, relocation, 3421 htab->elf.sgot->contents + off); 3422 h->got.offset |= 1; 3423 } 3424 } 3425 else 3426 unresolved_reloc = FALSE; 3427 } 3428 else 3429 { 3430 if (local_got_offsets == NULL) 3431 abort (); 3432 3433 off = local_got_offsets[r_symndx]; 3434 3435 /* The offset must always be a multiple of 4. We use 3436 the least significant bit to record whether we have 3437 already generated the necessary reloc. */ 3438 if ((off & 1) != 0) 3439 off &= ~1; 3440 else 3441 { 3442 bfd_put_32 (output_bfd, relocation, 3443 htab->elf.sgot->contents + off); 3444 3445 if (info->shared) 3446 { 3447 asection *s; 3448 Elf_Internal_Rela outrel; 3449 bfd_byte *loc; 3450 3451 s = htab->elf.srelgot; 3452 if (s == NULL) 3453 abort (); 3454 3455 outrel.r_offset = (htab->elf.sgot->output_section->vma 3456 + htab->elf.sgot->output_offset 3457 + off); 3458 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 3459 loc = s->contents; 3460 loc += s->reloc_count++ * sizeof (Elf32_External_Rel); 3461 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3462 } 3463 3464 local_got_offsets[r_symndx] |= 1; 3465 } 3466 } 3467 3468 if (off >= (bfd_vma) -2) 3469 abort (); 3470 3471 relocation = htab->elf.sgot->output_section->vma 3472 + htab->elf.sgot->output_offset + off 3473 - htab->elf.sgotplt->output_section->vma 3474 - htab->elf.sgotplt->output_offset; 3475 break; 3476 3477 case R_386_GOTOFF: 3478 /* Relocation is relative to the start of the global offset 3479 table. */ 3480 3481 /* Check to make sure it isn't a protected function symbol 3482 for shared library since it may not be local when used 3483 as function address. We also need to make sure that a 3484 symbol is defined locally. */ 3485 if (info->shared && h) 3486 { 3487 if (!h->def_regular) 3488 { 3489 const char *v; 3490 3491 switch (ELF_ST_VISIBILITY (h->other)) 3492 { 3493 case STV_HIDDEN: 3494 v = _("hidden symbol"); 3495 break; 3496 case STV_INTERNAL: 3497 v = _("internal symbol"); 3498 break; 3499 case STV_PROTECTED: 3500 v = _("protected symbol"); 3501 break; 3502 default: 3503 v = _("symbol"); 3504 break; 3505 } 3506 3507 (*_bfd_error_handler) 3508 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"), 3509 input_bfd, v, h->root.root.string); 3510 bfd_set_error (bfd_error_bad_value); 3511 return FALSE; 3512 } 3513 else if (!info->executable 3514 && h->type == STT_FUNC 3515 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) 3516 { 3517 (*_bfd_error_handler) 3518 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"), 3519 input_bfd, h->root.root.string); 3520 bfd_set_error (bfd_error_bad_value); 3521 return FALSE; 3522 } 3523 } 3524 3525 /* Note that sgot is not involved in this 3526 calculation. We always want the start of .got.plt. If we 3527 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is 3528 permitted by the ABI, we might have to change this 3529 calculation. */ 3530 relocation -= htab->elf.sgotplt->output_section->vma 3531 + htab->elf.sgotplt->output_offset; 3532 break; 3533 3534 case R_386_GOTPC: 3535 /* Use global offset table as symbol value. */ 3536 relocation = htab->elf.sgotplt->output_section->vma 3537 + htab->elf.sgotplt->output_offset; 3538 unresolved_reloc = FALSE; 3539 break; 3540 3541 case R_386_PLT32: 3542 /* Relocation is to the entry for this symbol in the 3543 procedure linkage table. */ 3544 3545 /* Resolve a PLT32 reloc against a local symbol directly, 3546 without using the procedure linkage table. */ 3547 if (h == NULL) 3548 break; 3549 3550 if (h->plt.offset == (bfd_vma) -1 3551 || htab->elf.splt == NULL) 3552 { 3553 /* We didn't make a PLT entry for this symbol. This 3554 happens when statically linking PIC code, or when 3555 using -Bsymbolic. */ 3556 break; 3557 } 3558 3559 relocation = (htab->elf.splt->output_section->vma 3560 + htab->elf.splt->output_offset 3561 + h->plt.offset); 3562 unresolved_reloc = FALSE; 3563 break; 3564 3565 case R_386_32: 3566 case R_386_PC32: 3567 if ((input_section->flags & SEC_ALLOC) == 0 3568 || is_vxworks_tls) 3569 break; 3570 3571 if ((info->shared 3572 && (h == NULL 3573 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 3574 || h->root.type != bfd_link_hash_undefweak) 3575 && (r_type != R_386_PC32 3576 || !SYMBOL_CALLS_LOCAL (info, h))) 3577 || (ELIMINATE_COPY_RELOCS 3578 && !info->shared 3579 && h != NULL 3580 && h->dynindx != -1 3581 && !h->non_got_ref 3582 && ((h->def_dynamic 3583 && !h->def_regular) 3584 || h->root.type == bfd_link_hash_undefweak 3585 || h->root.type == bfd_link_hash_undefined))) 3586 { 3587 Elf_Internal_Rela outrel; 3588 bfd_byte *loc; 3589 bfd_boolean skip, relocate; 3590 asection *sreloc; 3591 3592 /* When generating a shared object, these relocations 3593 are copied into the output file to be resolved at run 3594 time. */ 3595 3596 skip = FALSE; 3597 relocate = FALSE; 3598 3599 outrel.r_offset = 3600 _bfd_elf_section_offset (output_bfd, info, input_section, 3601 rel->r_offset); 3602 if (outrel.r_offset == (bfd_vma) -1) 3603 skip = TRUE; 3604 else if (outrel.r_offset == (bfd_vma) -2) 3605 skip = TRUE, relocate = TRUE; 3606 outrel.r_offset += (input_section->output_section->vma 3607 + input_section->output_offset); 3608 3609 if (skip) 3610 memset (&outrel, 0, sizeof outrel); 3611 else if (h != NULL 3612 && h->dynindx != -1 3613 && (r_type == R_386_PC32 3614 || !info->shared 3615 || !SYMBOLIC_BIND (info, h) 3616 || !h->def_regular)) 3617 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 3618 else 3619 { 3620 /* This symbol is local, or marked to become local. */ 3621 relocate = TRUE; 3622 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 3623 } 3624 3625 sreloc = elf_section_data (input_section)->sreloc; 3626 3627 if (sreloc == NULL || sreloc->contents == NULL) 3628 { 3629 r = bfd_reloc_notsupported; 3630 goto check_relocation_error; 3631 } 3632 3633 loc = sreloc->contents; 3634 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 3635 3636 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3637 3638 /* If this reloc is against an external symbol, we do 3639 not want to fiddle with the addend. Otherwise, we 3640 need to include the symbol value so that it becomes 3641 an addend for the dynamic reloc. */ 3642 if (! relocate) 3643 continue; 3644 } 3645 break; 3646 3647 case R_386_TLS_IE: 3648 if (!info->executable) 3649 { 3650 Elf_Internal_Rela outrel; 3651 bfd_byte *loc; 3652 asection *sreloc; 3653 3654 outrel.r_offset = rel->r_offset 3655 + input_section->output_section->vma 3656 + input_section->output_offset; 3657 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 3658 sreloc = elf_section_data (input_section)->sreloc; 3659 if (sreloc == NULL) 3660 abort (); 3661 loc = sreloc->contents; 3662 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 3663 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3664 } 3665 /* Fall through */ 3666 3667 case R_386_TLS_GD: 3668 case R_386_TLS_GOTDESC: 3669 case R_386_TLS_DESC_CALL: 3670 case R_386_TLS_IE_32: 3671 case R_386_TLS_GOTIE: 3672 tls_type = GOT_UNKNOWN; 3673 if (h == NULL && local_got_offsets) 3674 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx]; 3675 else if (h != NULL) 3676 tls_type = elf_i386_hash_entry(h)->tls_type; 3677 if (tls_type == GOT_TLS_IE) 3678 tls_type = GOT_TLS_IE_NEG; 3679 3680 if (! elf_i386_tls_transition (info, input_bfd, 3681 input_section, contents, 3682 symtab_hdr, sym_hashes, 3683 &r_type, tls_type, rel, 3684 relend, h, r_symndx)) 3685 return FALSE; 3686 3687 if (r_type == R_386_TLS_LE_32) 3688 { 3689 BFD_ASSERT (! unresolved_reloc); 3690 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) 3691 { 3692 unsigned int type; 3693 bfd_vma roff; 3694 3695 /* GD->LE transition. */ 3696 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 3697 if (type == 0x04) 3698 { 3699 /* leal foo(,%reg,1), %eax; call ___tls_get_addr 3700 Change it into: 3701 movl %gs:0, %eax; subl $foo@tpoff, %eax 3702 (6 byte form of subl). */ 3703 memcpy (contents + rel->r_offset - 3, 3704 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); 3705 roff = rel->r_offset + 5; 3706 } 3707 else 3708 { 3709 /* leal foo(%reg), %eax; call ___tls_get_addr; nop 3710 Change it into: 3711 movl %gs:0, %eax; subl $foo@tpoff, %eax 3712 (6 byte form of subl). */ 3713 memcpy (contents + rel->r_offset - 2, 3714 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); 3715 roff = rel->r_offset + 6; 3716 } 3717 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), 3718 contents + roff); 3719 /* Skip R_386_PC32/R_386_PLT32. */ 3720 rel++; 3721 continue; 3722 } 3723 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) 3724 { 3725 /* GDesc -> LE transition. 3726 It's originally something like: 3727 leal x@tlsdesc(%ebx), %eax 3728 3729 leal x@ntpoff, %eax 3730 3731 Registers other than %eax may be set up here. */ 3732 3733 unsigned int val; 3734 bfd_vma roff; 3735 3736 roff = rel->r_offset; 3737 val = bfd_get_8 (input_bfd, contents + roff - 1); 3738 3739 /* Now modify the instruction as appropriate. */ 3740 /* aoliva FIXME: remove the above and xor the byte 3741 below with 0x86. */ 3742 bfd_put_8 (output_bfd, val ^ 0x86, 3743 contents + roff - 1); 3744 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 3745 contents + roff); 3746 continue; 3747 } 3748 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) 3749 { 3750 /* GDesc -> LE transition. 3751 It's originally: 3752 call *(%eax) 3753 Turn it into: 3754 xchg %ax,%ax */ 3755 3756 bfd_vma roff; 3757 3758 roff = rel->r_offset; 3759 bfd_put_8 (output_bfd, 0x66, contents + roff); 3760 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 3761 continue; 3762 } 3763 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE) 3764 { 3765 unsigned int val; 3766 3767 /* IE->LE transition: 3768 Originally it can be one of: 3769 movl foo, %eax 3770 movl foo, %reg 3771 addl foo, %reg 3772 We change it into: 3773 movl $foo, %eax 3774 movl $foo, %reg 3775 addl $foo, %reg. */ 3776 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 3777 if (val == 0xa1) 3778 { 3779 /* movl foo, %eax. */ 3780 bfd_put_8 (output_bfd, 0xb8, 3781 contents + rel->r_offset - 1); 3782 } 3783 else 3784 { 3785 unsigned int type; 3786 3787 type = bfd_get_8 (input_bfd, 3788 contents + rel->r_offset - 2); 3789 switch (type) 3790 { 3791 case 0x8b: 3792 /* movl */ 3793 bfd_put_8 (output_bfd, 0xc7, 3794 contents + rel->r_offset - 2); 3795 bfd_put_8 (output_bfd, 3796 0xc0 | ((val >> 3) & 7), 3797 contents + rel->r_offset - 1); 3798 break; 3799 case 0x03: 3800 /* addl */ 3801 bfd_put_8 (output_bfd, 0x81, 3802 contents + rel->r_offset - 2); 3803 bfd_put_8 (output_bfd, 3804 0xc0 | ((val >> 3) & 7), 3805 contents + rel->r_offset - 1); 3806 break; 3807 default: 3808 BFD_FAIL (); 3809 break; 3810 } 3811 } 3812 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 3813 contents + rel->r_offset); 3814 continue; 3815 } 3816 else 3817 { 3818 unsigned int val, type; 3819 3820 /* {IE_32,GOTIE}->LE transition: 3821 Originally it can be one of: 3822 subl foo(%reg1), %reg2 3823 movl foo(%reg1), %reg2 3824 addl foo(%reg1), %reg2 3825 We change it into: 3826 subl $foo, %reg2 3827 movl $foo, %reg2 (6 byte form) 3828 addl $foo, %reg2. */ 3829 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 3830 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 3831 if (type == 0x8b) 3832 { 3833 /* movl */ 3834 bfd_put_8 (output_bfd, 0xc7, 3835 contents + rel->r_offset - 2); 3836 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 3837 contents + rel->r_offset - 1); 3838 } 3839 else if (type == 0x2b) 3840 { 3841 /* subl */ 3842 bfd_put_8 (output_bfd, 0x81, 3843 contents + rel->r_offset - 2); 3844 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), 3845 contents + rel->r_offset - 1); 3846 } 3847 else if (type == 0x03) 3848 { 3849 /* addl */ 3850 bfd_put_8 (output_bfd, 0x81, 3851 contents + rel->r_offset - 2); 3852 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 3853 contents + rel->r_offset - 1); 3854 } 3855 else 3856 BFD_FAIL (); 3857 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE) 3858 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 3859 contents + rel->r_offset); 3860 else 3861 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), 3862 contents + rel->r_offset); 3863 continue; 3864 } 3865 } 3866 3867 if (htab->elf.sgot == NULL) 3868 abort (); 3869 3870 if (h != NULL) 3871 { 3872 off = h->got.offset; 3873 offplt = elf_i386_hash_entry (h)->tlsdesc_got; 3874 } 3875 else 3876 { 3877 if (local_got_offsets == NULL) 3878 abort (); 3879 3880 off = local_got_offsets[r_symndx]; 3881 offplt = local_tlsdesc_gotents[r_symndx]; 3882 } 3883 3884 if ((off & 1) != 0) 3885 off &= ~1; 3886 else 3887 { 3888 Elf_Internal_Rela outrel; 3889 bfd_byte *loc; 3890 int dr_type; 3891 asection *sreloc; 3892 3893 if (htab->elf.srelgot == NULL) 3894 abort (); 3895 3896 indx = h && h->dynindx != -1 ? h->dynindx : 0; 3897 3898 if (GOT_TLS_GDESC_P (tls_type)) 3899 { 3900 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC); 3901 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8 3902 <= htab->elf.sgotplt->size); 3903 outrel.r_offset = (htab->elf.sgotplt->output_section->vma 3904 + htab->elf.sgotplt->output_offset 3905 + offplt 3906 + htab->sgotplt_jump_table_size); 3907 sreloc = htab->elf.srelplt; 3908 loc = sreloc->contents; 3909 loc += (htab->next_tls_desc_index++ 3910 * sizeof (Elf32_External_Rel)); 3911 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 3912 <= sreloc->contents + sreloc->size); 3913 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3914 if (indx == 0) 3915 { 3916 BFD_ASSERT (! unresolved_reloc); 3917 bfd_put_32 (output_bfd, 3918 relocation - elf_i386_dtpoff_base (info), 3919 htab->elf.sgotplt->contents + offplt 3920 + htab->sgotplt_jump_table_size + 4); 3921 } 3922 else 3923 { 3924 bfd_put_32 (output_bfd, 0, 3925 htab->elf.sgotplt->contents + offplt 3926 + htab->sgotplt_jump_table_size + 4); 3927 } 3928 } 3929 3930 sreloc = htab->elf.srelgot; 3931 3932 outrel.r_offset = (htab->elf.sgot->output_section->vma 3933 + htab->elf.sgot->output_offset + off); 3934 3935 if (GOT_TLS_GD_P (tls_type)) 3936 dr_type = R_386_TLS_DTPMOD32; 3937 else if (GOT_TLS_GDESC_P (tls_type)) 3938 goto dr_done; 3939 else if (tls_type == GOT_TLS_IE_POS) 3940 dr_type = R_386_TLS_TPOFF; 3941 else 3942 dr_type = R_386_TLS_TPOFF32; 3943 3944 if (dr_type == R_386_TLS_TPOFF && indx == 0) 3945 bfd_put_32 (output_bfd, 3946 relocation - elf_i386_dtpoff_base (info), 3947 htab->elf.sgot->contents + off); 3948 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) 3949 bfd_put_32 (output_bfd, 3950 elf_i386_dtpoff_base (info) - relocation, 3951 htab->elf.sgot->contents + off); 3952 else if (dr_type != R_386_TLS_DESC) 3953 bfd_put_32 (output_bfd, 0, 3954 htab->elf.sgot->contents + off); 3955 outrel.r_info = ELF32_R_INFO (indx, dr_type); 3956 3957 loc = sreloc->contents; 3958 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 3959 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 3960 <= sreloc->contents + sreloc->size); 3961 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3962 3963 if (GOT_TLS_GD_P (tls_type)) 3964 { 3965 if (indx == 0) 3966 { 3967 BFD_ASSERT (! unresolved_reloc); 3968 bfd_put_32 (output_bfd, 3969 relocation - elf_i386_dtpoff_base (info), 3970 htab->elf.sgot->contents + off + 4); 3971 } 3972 else 3973 { 3974 bfd_put_32 (output_bfd, 0, 3975 htab->elf.sgot->contents + off + 4); 3976 outrel.r_info = ELF32_R_INFO (indx, 3977 R_386_TLS_DTPOFF32); 3978 outrel.r_offset += 4; 3979 sreloc->reloc_count++; 3980 loc += sizeof (Elf32_External_Rel); 3981 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 3982 <= sreloc->contents + sreloc->size); 3983 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3984 } 3985 } 3986 else if (tls_type == GOT_TLS_IE_BOTH) 3987 { 3988 bfd_put_32 (output_bfd, 3989 (indx == 0 3990 ? relocation - elf_i386_dtpoff_base (info) 3991 : 0), 3992 htab->elf.sgot->contents + off + 4); 3993 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 3994 outrel.r_offset += 4; 3995 sreloc->reloc_count++; 3996 loc += sizeof (Elf32_External_Rel); 3997 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3998 } 3999 4000 dr_done: 4001 if (h != NULL) 4002 h->got.offset |= 1; 4003 else 4004 local_got_offsets[r_symndx] |= 1; 4005 } 4006 4007 if (off >= (bfd_vma) -2 4008 && ! GOT_TLS_GDESC_P (tls_type)) 4009 abort (); 4010 if (r_type == R_386_TLS_GOTDESC 4011 || r_type == R_386_TLS_DESC_CALL) 4012 { 4013 relocation = htab->sgotplt_jump_table_size + offplt; 4014 unresolved_reloc = FALSE; 4015 } 4016 else if (r_type == ELF32_R_TYPE (rel->r_info)) 4017 { 4018 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma 4019 + htab->elf.sgotplt->output_offset; 4020 relocation = htab->elf.sgot->output_section->vma 4021 + htab->elf.sgot->output_offset + off - g_o_t; 4022 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) 4023 && tls_type == GOT_TLS_IE_BOTH) 4024 relocation += 4; 4025 if (r_type == R_386_TLS_IE) 4026 relocation += g_o_t; 4027 unresolved_reloc = FALSE; 4028 } 4029 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) 4030 { 4031 unsigned int val, type; 4032 bfd_vma roff; 4033 4034 /* GD->IE transition. */ 4035 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 4036 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 4037 if (type == 0x04) 4038 { 4039 /* leal foo(,%reg,1), %eax; call ___tls_get_addr 4040 Change it into: 4041 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ 4042 val >>= 3; 4043 roff = rel->r_offset - 3; 4044 } 4045 else 4046 { 4047 /* leal foo(%reg), %eax; call ___tls_get_addr; nop 4048 Change it into: 4049 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ 4050 roff = rel->r_offset - 2; 4051 } 4052 memcpy (contents + roff, 4053 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); 4054 contents[roff + 7] = 0x80 | (val & 7); 4055 /* If foo is used only with foo@gotntpoff(%reg) and 4056 foo@indntpoff, but not with foo@gottpoff(%reg), change 4057 subl $foo@gottpoff(%reg), %eax 4058 into: 4059 addl $foo@gotntpoff(%reg), %eax. */ 4060 if (tls_type == GOT_TLS_IE_POS) 4061 contents[roff + 6] = 0x03; 4062 bfd_put_32 (output_bfd, 4063 htab->elf.sgot->output_section->vma 4064 + htab->elf.sgot->output_offset + off 4065 - htab->elf.sgotplt->output_section->vma 4066 - htab->elf.sgotplt->output_offset, 4067 contents + roff + 8); 4068 /* Skip R_386_PLT32. */ 4069 rel++; 4070 continue; 4071 } 4072 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) 4073 { 4074 /* GDesc -> IE transition. 4075 It's originally something like: 4076 leal x@tlsdesc(%ebx), %eax 4077 4078 Change it to: 4079 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax 4080 or: 4081 movl x@gottpoff(%ebx), %eax # before negl %eax 4082 4083 Registers other than %eax may be set up here. */ 4084 4085 bfd_vma roff; 4086 4087 /* First, make sure it's a leal adding ebx to a 32-bit 4088 offset into any register, although it's probably 4089 almost always going to be eax. */ 4090 roff = rel->r_offset; 4091 4092 /* Now modify the instruction as appropriate. */ 4093 /* To turn a leal into a movl in the form we use it, it 4094 suffices to change the first byte from 0x8d to 0x8b. 4095 aoliva FIXME: should we decide to keep the leal, all 4096 we have to do is remove the statement below, and 4097 adjust the relaxation of R_386_TLS_DESC_CALL. */ 4098 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); 4099 4100 if (tls_type == GOT_TLS_IE_BOTH) 4101 off += 4; 4102 4103 bfd_put_32 (output_bfd, 4104 htab->elf.sgot->output_section->vma 4105 + htab->elf.sgot->output_offset + off 4106 - htab->elf.sgotplt->output_section->vma 4107 - htab->elf.sgotplt->output_offset, 4108 contents + roff); 4109 continue; 4110 } 4111 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) 4112 { 4113 /* GDesc -> IE transition. 4114 It's originally: 4115 call *(%eax) 4116 4117 Change it to: 4118 xchg %ax,%ax 4119 or 4120 negl %eax 4121 depending on how we transformed the TLS_GOTDESC above. 4122 */ 4123 4124 bfd_vma roff; 4125 4126 roff = rel->r_offset; 4127 4128 /* Now modify the instruction as appropriate. */ 4129 if (tls_type != GOT_TLS_IE_NEG) 4130 { 4131 /* xchg %ax,%ax */ 4132 bfd_put_8 (output_bfd, 0x66, contents + roff); 4133 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 4134 } 4135 else 4136 { 4137 /* negl %eax */ 4138 bfd_put_8 (output_bfd, 0xf7, contents + roff); 4139 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1); 4140 } 4141 4142 continue; 4143 } 4144 else 4145 BFD_ASSERT (FALSE); 4146 break; 4147 4148 case R_386_TLS_LDM: 4149 if (! elf_i386_tls_transition (info, input_bfd, 4150 input_section, contents, 4151 symtab_hdr, sym_hashes, 4152 &r_type, GOT_UNKNOWN, rel, 4153 relend, h, r_symndx)) 4154 return FALSE; 4155 4156 if (r_type != R_386_TLS_LDM) 4157 { 4158 /* LD->LE transition: 4159 leal foo(%reg), %eax; call ___tls_get_addr. 4160 We change it into: 4161 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */ 4162 BFD_ASSERT (r_type == R_386_TLS_LE_32); 4163 memcpy (contents + rel->r_offset - 2, 4164 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); 4165 /* Skip R_386_PC32/R_386_PLT32. */ 4166 rel++; 4167 continue; 4168 } 4169 4170 if (htab->elf.sgot == NULL) 4171 abort (); 4172 4173 off = htab->tls_ldm_got.offset; 4174 if (off & 1) 4175 off &= ~1; 4176 else 4177 { 4178 Elf_Internal_Rela outrel; 4179 bfd_byte *loc; 4180 4181 if (htab->elf.srelgot == NULL) 4182 abort (); 4183 4184 outrel.r_offset = (htab->elf.sgot->output_section->vma 4185 + htab->elf.sgot->output_offset + off); 4186 4187 bfd_put_32 (output_bfd, 0, 4188 htab->elf.sgot->contents + off); 4189 bfd_put_32 (output_bfd, 0, 4190 htab->elf.sgot->contents + off + 4); 4191 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); 4192 loc = htab->elf.srelgot->contents; 4193 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel); 4194 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 4195 htab->tls_ldm_got.offset |= 1; 4196 } 4197 relocation = htab->elf.sgot->output_section->vma 4198 + htab->elf.sgot->output_offset + off 4199 - htab->elf.sgotplt->output_section->vma 4200 - htab->elf.sgotplt->output_offset; 4201 unresolved_reloc = FALSE; 4202 break; 4203 4204 case R_386_TLS_LDO_32: 4205 if (!info->executable || (input_section->flags & SEC_CODE) == 0) 4206 relocation -= elf_i386_dtpoff_base (info); 4207 else 4208 /* When converting LDO to LE, we must negate. */ 4209 relocation = -elf_i386_tpoff (info, relocation); 4210 break; 4211 4212 case R_386_TLS_LE_32: 4213 case R_386_TLS_LE: 4214 if (!info->executable) 4215 { 4216 Elf_Internal_Rela outrel; 4217 asection *sreloc; 4218 bfd_byte *loc; 4219 4220 outrel.r_offset = rel->r_offset 4221 + input_section->output_section->vma 4222 + input_section->output_offset; 4223 if (h != NULL && h->dynindx != -1) 4224 indx = h->dynindx; 4225 else 4226 indx = 0; 4227 if (r_type == R_386_TLS_LE_32) 4228 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); 4229 else 4230 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 4231 sreloc = elf_section_data (input_section)->sreloc; 4232 if (sreloc == NULL) 4233 abort (); 4234 loc = sreloc->contents; 4235 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 4236 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 4237 if (indx) 4238 continue; 4239 else if (r_type == R_386_TLS_LE_32) 4240 relocation = elf_i386_dtpoff_base (info) - relocation; 4241 else 4242 relocation -= elf_i386_dtpoff_base (info); 4243 } 4244 else if (r_type == R_386_TLS_LE_32) 4245 relocation = elf_i386_tpoff (info, relocation); 4246 else 4247 relocation = -elf_i386_tpoff (info, relocation); 4248 break; 4249 4250 default: 4251 break; 4252 } 4253 4254 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 4255 because such sections are not SEC_ALLOC and thus ld.so will 4256 not process them. */ 4257 if (unresolved_reloc 4258 && !((input_section->flags & SEC_DEBUGGING) != 0 4259 && h->def_dynamic) 4260 && _bfd_elf_section_offset (output_bfd, info, input_section, 4261 rel->r_offset) != (bfd_vma) -1) 4262 { 4263 (*_bfd_error_handler) 4264 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 4265 input_bfd, 4266 input_section, 4267 (long) rel->r_offset, 4268 howto->name, 4269 h->root.root.string); 4270 return FALSE; 4271 } 4272 4273 do_relocation: 4274 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 4275 contents, rel->r_offset, 4276 relocation, 0); 4277 4278 check_relocation_error: 4279 if (r != bfd_reloc_ok) 4280 { 4281 const char *name; 4282 4283 if (h != NULL) 4284 name = h->root.root.string; 4285 else 4286 { 4287 name = bfd_elf_string_from_elf_section (input_bfd, 4288 symtab_hdr->sh_link, 4289 sym->st_name); 4290 if (name == NULL) 4291 return FALSE; 4292 if (*name == '\0') 4293 name = bfd_section_name (input_bfd, sec); 4294 } 4295 4296 if (r == bfd_reloc_overflow) 4297 { 4298 if (! ((*info->callbacks->reloc_overflow) 4299 (info, (h ? &h->root : NULL), name, howto->name, 4300 (bfd_vma) 0, input_bfd, input_section, 4301 rel->r_offset))) 4302 return FALSE; 4303 } 4304 else 4305 { 4306 (*_bfd_error_handler) 4307 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 4308 input_bfd, input_section, 4309 (long) rel->r_offset, name, (int) r); 4310 return FALSE; 4311 } 4312 } 4313 } 4314 4315 return TRUE; 4316 } 4317 4318 /* Finish up dynamic symbol handling. We set the contents of various 4319 dynamic sections here. */ 4320 4321 static bfd_boolean 4322 elf_i386_finish_dynamic_symbol (bfd *output_bfd, 4323 struct bfd_link_info *info, 4324 struct elf_link_hash_entry *h, 4325 Elf_Internal_Sym *sym) 4326 { 4327 struct elf_i386_link_hash_table *htab; 4328 unsigned plt_entry_size; 4329 const struct elf_i386_backend_data *abed; 4330 4331 htab = elf_i386_hash_table (info); 4332 if (htab == NULL) 4333 return FALSE; 4334 4335 abed = get_elf_i386_backend_data (output_bfd); 4336 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd); 4337 4338 if (h->plt.offset != (bfd_vma) -1) 4339 { 4340 bfd_vma plt_index; 4341 bfd_vma got_offset; 4342 Elf_Internal_Rela rel; 4343 bfd_byte *loc; 4344 asection *plt, *gotplt, *relplt; 4345 4346 /* When building a static executable, use .iplt, .igot.plt and 4347 .rel.iplt sections for STT_GNU_IFUNC symbols. */ 4348 if (htab->elf.splt != NULL) 4349 { 4350 plt = htab->elf.splt; 4351 gotplt = htab->elf.sgotplt; 4352 relplt = htab->elf.srelplt; 4353 } 4354 else 4355 { 4356 plt = htab->elf.iplt; 4357 gotplt = htab->elf.igotplt; 4358 relplt = htab->elf.irelplt; 4359 } 4360 4361 /* This symbol has an entry in the procedure linkage table. Set 4362 it up. */ 4363 4364 if ((h->dynindx == -1 4365 && !((h->forced_local || info->executable) 4366 && h->def_regular 4367 && h->type == STT_GNU_IFUNC)) 4368 || plt == NULL 4369 || gotplt == NULL 4370 || relplt == NULL) 4371 return FALSE; 4372 4373 /* Get the index in the procedure linkage table which 4374 corresponds to this symbol. This is the index of this symbol 4375 in all the symbols for which we are making plt entries. The 4376 first entry in the procedure linkage table is reserved. 4377 4378 Get the offset into the .got table of the entry that 4379 corresponds to this function. Each .got entry is 4 bytes. 4380 The first three are reserved. 4381 4382 For static executables, we don't reserve anything. */ 4383 4384 if (plt == htab->elf.splt) 4385 { 4386 got_offset = h->plt.offset / plt_entry_size - 1; 4387 got_offset = (got_offset + 3) * 4; 4388 } 4389 else 4390 { 4391 got_offset = h->plt.offset / plt_entry_size; 4392 got_offset = got_offset * 4; 4393 } 4394 4395 /* Fill in the entry in the procedure linkage table. */ 4396 if (! info->shared) 4397 { 4398 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry, 4399 abed->plt->plt_entry_size); 4400 bfd_put_32 (output_bfd, 4401 (gotplt->output_section->vma 4402 + gotplt->output_offset 4403 + got_offset), 4404 plt->contents + h->plt.offset 4405 + abed->plt->plt_got_offset); 4406 4407 if (abed->is_vxworks) 4408 { 4409 int s, k, reloc_index; 4410 4411 /* Create the R_386_32 relocation referencing the GOT 4412 for this PLT entry. */ 4413 4414 /* S: Current slot number (zero-based). */ 4415 s = ((h->plt.offset - abed->plt->plt_entry_size) 4416 / abed->plt->plt_entry_size); 4417 /* K: Number of relocations for PLTResolve. */ 4418 if (info->shared) 4419 k = PLTRESOLVE_RELOCS_SHLIB; 4420 else 4421 k = PLTRESOLVE_RELOCS; 4422 /* Skip the PLTresolve relocations, and the relocations for 4423 the other PLT slots. */ 4424 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS; 4425 loc = (htab->srelplt2->contents + reloc_index 4426 * sizeof (Elf32_External_Rel)); 4427 4428 rel.r_offset = (htab->elf.splt->output_section->vma 4429 + htab->elf.splt->output_offset 4430 + h->plt.offset + 2), 4431 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 4432 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 4433 4434 /* Create the R_386_32 relocation referencing the beginning of 4435 the PLT for this GOT entry. */ 4436 rel.r_offset = (htab->elf.sgotplt->output_section->vma 4437 + htab->elf.sgotplt->output_offset 4438 + got_offset); 4439 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); 4440 bfd_elf32_swap_reloc_out (output_bfd, &rel, 4441 loc + sizeof (Elf32_External_Rel)); 4442 } 4443 } 4444 else 4445 { 4446 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry, 4447 abed->plt->plt_entry_size); 4448 bfd_put_32 (output_bfd, got_offset, 4449 plt->contents + h->plt.offset 4450 + abed->plt->plt_got_offset); 4451 } 4452 4453 /* Fill in the entry in the global offset table. */ 4454 bfd_put_32 (output_bfd, 4455 (plt->output_section->vma 4456 + plt->output_offset 4457 + h->plt.offset 4458 + abed->plt->plt_lazy_offset), 4459 gotplt->contents + got_offset); 4460 4461 /* Fill in the entry in the .rel.plt section. */ 4462 rel.r_offset = (gotplt->output_section->vma 4463 + gotplt->output_offset 4464 + got_offset); 4465 if (h->dynindx == -1 4466 || ((info->executable 4467 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 4468 && h->def_regular 4469 && h->type == STT_GNU_IFUNC)) 4470 { 4471 /* If an STT_GNU_IFUNC symbol is locally defined, generate 4472 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend 4473 in the .got.plt section. */ 4474 bfd_put_32 (output_bfd, 4475 (h->root.u.def.value 4476 + h->root.u.def.section->output_section->vma 4477 + h->root.u.def.section->output_offset), 4478 gotplt->contents + got_offset); 4479 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); 4480 /* R_386_IRELATIVE comes last. */ 4481 plt_index = htab->next_irelative_index--; 4482 } 4483 else 4484 { 4485 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); 4486 plt_index = htab->next_jump_slot_index++; 4487 } 4488 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel); 4489 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 4490 4491 /* Don't fill PLT entry for static executables. */ 4492 if (plt == htab->elf.splt) 4493 { 4494 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), 4495 plt->contents + h->plt.offset 4496 + abed->plt->plt_reloc_offset); 4497 bfd_put_32 (output_bfd, - (h->plt.offset 4498 + abed->plt->plt_plt_offset + 4), 4499 plt->contents + h->plt.offset 4500 + abed->plt->plt_plt_offset); 4501 } 4502 4503 if (!h->def_regular) 4504 { 4505 /* Mark the symbol as undefined, rather than as defined in 4506 the .plt section. Leave the value if there were any 4507 relocations where pointer equality matters (this is a clue 4508 for the dynamic linker, to make function pointer 4509 comparisons work between an application and shared 4510 library), otherwise set it to zero. If a function is only 4511 called from a binary, there is no need to slow down 4512 shared libraries because of that. */ 4513 sym->st_shndx = SHN_UNDEF; 4514 if (!h->pointer_equality_needed) 4515 sym->st_value = 0; 4516 } 4517 } 4518 4519 if (h->got.offset != (bfd_vma) -1 4520 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type) 4521 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0) 4522 { 4523 Elf_Internal_Rela rel; 4524 bfd_byte *loc; 4525 4526 /* This symbol has an entry in the global offset table. Set it 4527 up. */ 4528 4529 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 4530 abort (); 4531 4532 rel.r_offset = (htab->elf.sgot->output_section->vma 4533 + htab->elf.sgot->output_offset 4534 + (h->got.offset & ~(bfd_vma) 1)); 4535 4536 /* If this is a static link, or it is a -Bsymbolic link and the 4537 symbol is defined locally or was forced to be local because 4538 of a version file, we just want to emit a RELATIVE reloc. 4539 The entry in the global offset table will already have been 4540 initialized in the relocate_section function. */ 4541 if (h->def_regular 4542 && h->type == STT_GNU_IFUNC) 4543 { 4544 if (info->shared) 4545 { 4546 /* Generate R_386_GLOB_DAT. */ 4547 goto do_glob_dat; 4548 } 4549 else 4550 { 4551 asection *plt; 4552 4553 if (!h->pointer_equality_needed) 4554 abort (); 4555 4556 /* For non-shared object, we can't use .got.plt, which 4557 contains the real function addres if we need pointer 4558 equality. We load the GOT entry with the PLT entry. */ 4559 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; 4560 bfd_put_32 (output_bfd, 4561 (plt->output_section->vma 4562 + plt->output_offset + h->plt.offset), 4563 htab->elf.sgot->contents + h->got.offset); 4564 return TRUE; 4565 } 4566 } 4567 else if (info->shared 4568 && SYMBOL_REFERENCES_LOCAL (info, h)) 4569 { 4570 BFD_ASSERT((h->got.offset & 1) != 0); 4571 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 4572 } 4573 else 4574 { 4575 BFD_ASSERT((h->got.offset & 1) == 0); 4576 do_glob_dat: 4577 bfd_put_32 (output_bfd, (bfd_vma) 0, 4578 htab->elf.sgot->contents + h->got.offset); 4579 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); 4580 } 4581 4582 loc = htab->elf.srelgot->contents; 4583 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel); 4584 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 4585 } 4586 4587 if (h->needs_copy) 4588 { 4589 Elf_Internal_Rela rel; 4590 bfd_byte *loc; 4591 4592 /* This symbol needs a copy reloc. Set it up. */ 4593 4594 if (h->dynindx == -1 4595 || (h->root.type != bfd_link_hash_defined 4596 && h->root.type != bfd_link_hash_defweak) 4597 || htab->srelbss == NULL) 4598 abort (); 4599 4600 rel.r_offset = (h->root.u.def.value 4601 + h->root.u.def.section->output_section->vma 4602 + h->root.u.def.section->output_offset); 4603 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); 4604 loc = htab->srelbss->contents; 4605 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel); 4606 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 4607 } 4608 4609 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may 4610 be NULL for local symbols. 4611 4612 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it 4613 is relative to the ".got" section. */ 4614 if (sym != NULL 4615 && (strcmp (h->root.root.string, "_DYNAMIC") == 0 4616 || (!abed->is_vxworks 4617 && h == htab->elf.hgot))) 4618 sym->st_shndx = SHN_ABS; 4619 4620 return TRUE; 4621 } 4622 4623 /* Finish up local dynamic symbol handling. We set the contents of 4624 various dynamic sections here. */ 4625 4626 static bfd_boolean 4627 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf) 4628 { 4629 struct elf_link_hash_entry *h 4630 = (struct elf_link_hash_entry *) *slot; 4631 struct bfd_link_info *info 4632 = (struct bfd_link_info *) inf; 4633 4634 return elf_i386_finish_dynamic_symbol (info->output_bfd, info, 4635 h, NULL); 4636 } 4637 4638 /* Used to decide how to sort relocs in an optimal manner for the 4639 dynamic linker, before writing them out. */ 4640 4641 static enum elf_reloc_type_class 4642 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela) 4643 { 4644 switch (ELF32_R_TYPE (rela->r_info)) 4645 { 4646 case R_386_RELATIVE: 4647 return reloc_class_relative; 4648 case R_386_JUMP_SLOT: 4649 return reloc_class_plt; 4650 case R_386_COPY: 4651 return reloc_class_copy; 4652 default: 4653 return reloc_class_normal; 4654 } 4655 } 4656 4657 /* Finish up the dynamic sections. */ 4658 4659 static bfd_boolean 4660 elf_i386_finish_dynamic_sections (bfd *output_bfd, 4661 struct bfd_link_info *info) 4662 { 4663 struct elf_i386_link_hash_table *htab; 4664 bfd *dynobj; 4665 asection *sdyn; 4666 const struct elf_i386_backend_data *abed; 4667 4668 htab = elf_i386_hash_table (info); 4669 if (htab == NULL) 4670 return FALSE; 4671 4672 dynobj = htab->elf.dynobj; 4673 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 4674 abed = get_elf_i386_backend_data (output_bfd); 4675 4676 if (htab->elf.dynamic_sections_created) 4677 { 4678 Elf32_External_Dyn *dyncon, *dynconend; 4679 4680 if (sdyn == NULL || htab->elf.sgot == NULL) 4681 abort (); 4682 4683 dyncon = (Elf32_External_Dyn *) sdyn->contents; 4684 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 4685 for (; dyncon < dynconend; dyncon++) 4686 { 4687 Elf_Internal_Dyn dyn; 4688 asection *s; 4689 4690 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 4691 4692 switch (dyn.d_tag) 4693 { 4694 default: 4695 if (abed->is_vxworks 4696 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn)) 4697 break; 4698 continue; 4699 4700 case DT_PLTGOT: 4701 s = htab->elf.sgotplt; 4702 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 4703 break; 4704 4705 case DT_JMPREL: 4706 s = htab->elf.srelplt; 4707 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 4708 break; 4709 4710 case DT_PLTRELSZ: 4711 s = htab->elf.srelplt; 4712 dyn.d_un.d_val = s->size; 4713 break; 4714 4715 case DT_RELSZ: 4716 /* My reading of the SVR4 ABI indicates that the 4717 procedure linkage table relocs (DT_JMPREL) should be 4718 included in the overall relocs (DT_REL). This is 4719 what Solaris does. However, UnixWare can not handle 4720 that case. Therefore, we override the DT_RELSZ entry 4721 here to make it not include the JMPREL relocs. */ 4722 s = htab->elf.srelplt; 4723 if (s == NULL) 4724 continue; 4725 dyn.d_un.d_val -= s->size; 4726 break; 4727 4728 case DT_REL: 4729 /* We may not be using the standard ELF linker script. 4730 If .rel.plt is the first .rel section, we adjust 4731 DT_REL to not include it. */ 4732 s = htab->elf.srelplt; 4733 if (s == NULL) 4734 continue; 4735 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) 4736 continue; 4737 dyn.d_un.d_ptr += s->size; 4738 break; 4739 } 4740 4741 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 4742 } 4743 4744 /* Fill in the first entry in the procedure linkage table. */ 4745 if (htab->elf.splt && htab->elf.splt->size > 0) 4746 { 4747 if (info->shared) 4748 { 4749 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry, 4750 abed->plt->plt0_entry_size); 4751 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size, 4752 abed->plt0_pad_byte, 4753 abed->plt->plt_entry_size - abed->plt->plt0_entry_size); 4754 } 4755 else 4756 { 4757 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry, 4758 abed->plt->plt0_entry_size); 4759 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size, 4760 abed->plt0_pad_byte, 4761 abed->plt->plt_entry_size - abed->plt->plt0_entry_size); 4762 bfd_put_32 (output_bfd, 4763 (htab->elf.sgotplt->output_section->vma 4764 + htab->elf.sgotplt->output_offset 4765 + 4), 4766 htab->elf.splt->contents 4767 + abed->plt->plt0_got1_offset); 4768 bfd_put_32 (output_bfd, 4769 (htab->elf.sgotplt->output_section->vma 4770 + htab->elf.sgotplt->output_offset 4771 + 8), 4772 htab->elf.splt->contents 4773 + abed->plt->plt0_got2_offset); 4774 4775 if (abed->is_vxworks) 4776 { 4777 Elf_Internal_Rela rel; 4778 4779 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4. 4780 On IA32 we use REL relocations so the addend goes in 4781 the PLT directly. */ 4782 rel.r_offset = (htab->elf.splt->output_section->vma 4783 + htab->elf.splt->output_offset 4784 + abed->plt->plt0_got1_offset); 4785 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 4786 bfd_elf32_swap_reloc_out (output_bfd, &rel, 4787 htab->srelplt2->contents); 4788 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ 4789 rel.r_offset = (htab->elf.splt->output_section->vma 4790 + htab->elf.splt->output_offset 4791 + abed->plt->plt0_got2_offset); 4792 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 4793 bfd_elf32_swap_reloc_out (output_bfd, &rel, 4794 htab->srelplt2->contents + 4795 sizeof (Elf32_External_Rel)); 4796 } 4797 } 4798 4799 /* UnixWare sets the entsize of .plt to 4, although that doesn't 4800 really seem like the right value. */ 4801 elf_section_data (htab->elf.splt->output_section) 4802 ->this_hdr.sh_entsize = 4; 4803 4804 /* Correct the .rel.plt.unloaded relocations. */ 4805 if (abed->is_vxworks && !info->shared) 4806 { 4807 int num_plts = (htab->elf.splt->size 4808 / abed->plt->plt_entry_size) - 1; 4809 unsigned char *p; 4810 4811 p = htab->srelplt2->contents; 4812 if (info->shared) 4813 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel); 4814 else 4815 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel); 4816 4817 for (; num_plts; num_plts--) 4818 { 4819 Elf_Internal_Rela rel; 4820 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 4821 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 4822 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 4823 p += sizeof (Elf32_External_Rel); 4824 4825 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 4826 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); 4827 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 4828 p += sizeof (Elf32_External_Rel); 4829 } 4830 } 4831 } 4832 } 4833 4834 if (htab->elf.sgotplt) 4835 { 4836 if (bfd_is_abs_section (htab->elf.sgotplt->output_section)) 4837 { 4838 (*_bfd_error_handler) 4839 (_("discarded output section: `%A'"), htab->elf.sgotplt); 4840 return FALSE; 4841 } 4842 4843 /* Fill in the first three entries in the global offset table. */ 4844 if (htab->elf.sgotplt->size > 0) 4845 { 4846 bfd_put_32 (output_bfd, 4847 (sdyn == NULL ? 0 4848 : sdyn->output_section->vma + sdyn->output_offset), 4849 htab->elf.sgotplt->contents); 4850 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4); 4851 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8); 4852 } 4853 4854 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4; 4855 } 4856 4857 /* Adjust .eh_frame for .plt section. */ 4858 if (htab->plt_eh_frame != NULL) 4859 { 4860 if (htab->elf.splt != NULL 4861 && htab->elf.splt->size != 0 4862 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0 4863 && htab->elf.splt->output_section != NULL 4864 && htab->plt_eh_frame->output_section != NULL) 4865 { 4866 bfd_vma plt_start = htab->elf.splt->output_section->vma; 4867 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma 4868 + htab->plt_eh_frame->output_offset 4869 + PLT_FDE_START_OFFSET; 4870 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start, 4871 htab->plt_eh_frame->contents 4872 + PLT_FDE_START_OFFSET); 4873 } 4874 if (htab->plt_eh_frame->sec_info_type 4875 == ELF_INFO_TYPE_EH_FRAME) 4876 { 4877 if (! _bfd_elf_write_section_eh_frame (output_bfd, info, 4878 htab->plt_eh_frame, 4879 htab->plt_eh_frame->contents)) 4880 return FALSE; 4881 } 4882 } 4883 4884 if (htab->elf.sgot && htab->elf.sgot->size > 0) 4885 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4; 4886 4887 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ 4888 htab_traverse (htab->loc_hash_table, 4889 elf_i386_finish_local_dynamic_symbol, 4890 info); 4891 4892 return TRUE; 4893 } 4894 4895 /* Return address for Ith PLT stub in section PLT, for relocation REL 4896 or (bfd_vma) -1 if it should not be included. */ 4897 4898 static bfd_vma 4899 elf_i386_plt_sym_val (bfd_vma i, const asection *plt, 4900 const arelent *rel ATTRIBUTE_UNUSED) 4901 { 4902 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner); 4903 } 4904 4905 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 4906 4907 static bfd_boolean 4908 elf_i386_hash_symbol (struct elf_link_hash_entry *h) 4909 { 4910 if (h->plt.offset != (bfd_vma) -1 4911 && !h->def_regular 4912 && !h->pointer_equality_needed) 4913 return FALSE; 4914 4915 return _bfd_elf_hash_symbol (h); 4916 } 4917 4918 /* Hook called by the linker routine which adds symbols from an object 4919 file. */ 4920 4921 static bfd_boolean 4922 elf_i386_add_symbol_hook (bfd * abfd, 4923 struct bfd_link_info * info ATTRIBUTE_UNUSED, 4924 Elf_Internal_Sym * sym, 4925 const char ** namep ATTRIBUTE_UNUSED, 4926 flagword * flagsp ATTRIBUTE_UNUSED, 4927 asection ** secp ATTRIBUTE_UNUSED, 4928 bfd_vma * valp ATTRIBUTE_UNUSED) 4929 { 4930 if ((abfd->flags & DYNAMIC) == 0 4931 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC 4932 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)) 4933 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE; 4934 4935 return TRUE; 4936 } 4937 4938 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec 4939 #define TARGET_LITTLE_NAME "elf32-i386" 4940 #define ELF_ARCH bfd_arch_i386 4941 #define ELF_TARGET_ID I386_ELF_DATA 4942 #define ELF_MACHINE_CODE EM_386 4943 #define ELF_MAXPAGESIZE 0x1000 4944 4945 #define elf_backend_can_gc_sections 1 4946 #define elf_backend_can_refcount 1 4947 #define elf_backend_want_got_plt 1 4948 #define elf_backend_plt_readonly 1 4949 #define elf_backend_want_plt_sym 0 4950 #define elf_backend_got_header_size 12 4951 #define elf_backend_plt_alignment 4 4952 4953 /* Support RELA for objdump of prelink objects. */ 4954 #define elf_info_to_howto elf_i386_info_to_howto_rel 4955 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel 4956 4957 #define bfd_elf32_mkobject elf_i386_mkobject 4958 4959 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name 4960 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create 4961 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free 4962 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup 4963 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup 4964 4965 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol 4966 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible 4967 #define elf_backend_check_relocs elf_i386_check_relocs 4968 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol 4969 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections 4970 #define elf_backend_fake_sections elf_i386_fake_sections 4971 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections 4972 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol 4973 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook 4974 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook 4975 #define elf_backend_grok_prstatus elf_i386_grok_prstatus 4976 #define elf_backend_grok_psinfo elf_i386_grok_psinfo 4977 #define elf_backend_reloc_type_class elf_i386_reloc_type_class 4978 #define elf_backend_relocate_section elf_i386_relocate_section 4979 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections 4980 #define elf_backend_always_size_sections elf_i386_always_size_sections 4981 #define elf_backend_omit_section_dynsym \ 4982 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 4983 #define elf_backend_plt_sym_val elf_i386_plt_sym_val 4984 #define elf_backend_hash_symbol elf_i386_hash_symbol 4985 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook 4986 #undef elf_backend_post_process_headers 4987 #define elf_backend_post_process_headers _bfd_elf_set_osabi 4988 4989 #include "elf32-target.h" 4990 4991 /* FreeBSD support. */ 4992 4993 #undef TARGET_LITTLE_SYM 4994 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec 4995 #undef TARGET_LITTLE_NAME 4996 #define TARGET_LITTLE_NAME "elf32-i386-freebsd" 4997 #undef ELF_OSABI 4998 #define ELF_OSABI ELFOSABI_FREEBSD 4999 5000 /* The kernel recognizes executables as valid only if they carry a 5001 "FreeBSD" label in the ELF header. So we put this label on all 5002 executables and (for simplicity) also all other object files. */ 5003 5004 static void 5005 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info) 5006 { 5007 _bfd_elf_set_osabi (abfd, info); 5008 5009 #ifdef OLD_FREEBSD_ABI_LABEL 5010 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ 5011 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); 5012 #endif 5013 } 5014 5015 #undef elf_backend_post_process_headers 5016 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers 5017 #undef elf32_bed 5018 #define elf32_bed elf32_i386_fbsd_bed 5019 5020 #undef elf_backend_add_symbol_hook 5021 5022 #include "elf32-target.h" 5023 5024 /* Solaris 2. */ 5025 5026 #undef TARGET_LITTLE_SYM 5027 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec 5028 #undef TARGET_LITTLE_NAME 5029 #define TARGET_LITTLE_NAME "elf32-i386-sol2" 5030 5031 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE 5032 objects won't be recognized. */ 5033 #undef ELF_OSABI 5034 5035 #undef elf32_bed 5036 #define elf32_bed elf32_i386_sol2_bed 5037 5038 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte 5039 boundary. */ 5040 #undef elf_backend_static_tls_alignment 5041 #define elf_backend_static_tls_alignment 8 5042 5043 /* The Solaris 2 ABI requires a plt symbol on all platforms. 5044 5045 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output 5046 File, p.63. */ 5047 #undef elf_backend_want_plt_sym 5048 #define elf_backend_want_plt_sym 1 5049 5050 #include "elf32-target.h" 5051 5052 /* Native Client support. */ 5053 5054 #undef TARGET_LITTLE_SYM 5055 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec 5056 #undef TARGET_LITTLE_NAME 5057 #define TARGET_LITTLE_NAME "elf32-i386-nacl" 5058 #undef elf32_bed 5059 #define elf32_bed elf32_i386_nacl_bed 5060 5061 #undef ELF_MAXPAGESIZE 5062 #define ELF_MAXPAGESIZE 0x10000 5063 5064 /* Restore defaults. */ 5065 #undef ELF_OSABI 5066 #undef elf_backend_want_plt_sym 5067 #define elf_backend_want_plt_sym 0 5068 #undef elf_backend_post_process_headers 5069 #define elf_backend_post_process_headers _bfd_elf_set_osabi 5070 #undef elf_backend_static_tls_alignment 5071 5072 /* NaCl uses substantially different PLT entries for the same effects. */ 5073 5074 #undef elf_backend_plt_alignment 5075 #define elf_backend_plt_alignment 5 5076 #define NACL_PLT_ENTRY_SIZE 64 5077 #define NACLMASK 0xe0 /* 32-byte alignment mask. */ 5078 5079 static const bfd_byte elf_i386_nacl_plt0_entry[] = 5080 { 5081 0xff, 0x35, /* pushl contents of address */ 5082 0, 0, 0, 0, /* replaced with address of .got + 4. */ 5083 0x8b, 0x0d, /* movl contents of address, %ecx */ 5084 0, 0, 0, 0, /* replaced with address of .got + 8. */ 5085 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */ 5086 0xff, 0xe1 /* jmp *%ecx */ 5087 }; 5088 5089 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] = 5090 { 5091 0x8b, 0x0d, /* movl contents of address, %ecx */ 5092 0, 0, 0, 0, /* replaced with GOT slot address. */ 5093 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */ 5094 0xff, 0xe1, /* jmp *%ecx */ 5095 5096 /* Pad to the next 32-byte boundary with nop instructions. */ 5097 0x90, 5098 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 5099 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 5100 5101 /* Lazy GOT entries point here (32-byte aligned). */ 5102 0x68, /* pushl immediate */ 5103 0, 0, 0, 0, /* replaced with reloc offset. */ 5104 0xe9, /* jmp relative */ 5105 0, 0, 0, 0, /* replaced with offset to .plt. */ 5106 5107 /* Pad to the next 32-byte boundary with nop instructions. */ 5108 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 5109 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 5110 0x90, 0x90 5111 }; 5112 5113 static const bfd_byte 5114 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] = 5115 { 5116 0xff, 0x73, 0x04, /* pushl 4(%ebx) */ 5117 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */ 5118 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */ 5119 0xff, 0xe1, /* jmp *%ecx */ 5120 0x90 /* nop */ 5121 }; 5122 5123 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] = 5124 { 5125 0x8b, 0x8b, /* movl offset(%ebx), %ecx */ 5126 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 5127 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */ 5128 0xff, 0xe1, /* jmp *%ecx */ 5129 5130 /* Pad to the next 32-byte boundary with nop instructions. */ 5131 0x90, 5132 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 5133 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 5134 5135 /* Lazy GOT entries point here (32-byte aligned). */ 5136 0x68, /* pushl immediate */ 5137 0, 0, 0, 0, /* replaced with offset into relocation table. */ 5138 0xe9, /* jmp relative */ 5139 0, 0, 0, 0, /* replaced with offset to start of .plt. */ 5140 5141 /* Pad to the next 32-byte boundary with nop instructions. */ 5142 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 5143 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 5144 0x90, 0x90 5145 }; 5146 5147 static const bfd_byte elf_i386_nacl_eh_frame_plt[] = 5148 { 5149 #if (PLT_CIE_LENGTH != 20 \ 5150 || PLT_FDE_LENGTH != 36 \ 5151 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \ 5152 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12) 5153 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!" 5154 #endif 5155 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 5156 0, 0, 0, 0, /* CIE ID */ 5157 1, /* CIE version */ 5158 'z', 'R', 0, /* Augmentation string */ 5159 1, /* Code alignment factor */ 5160 0x7c, /* Data alignment factor: -4 */ 5161 8, /* Return address column */ 5162 1, /* Augmentation size */ 5163 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 5164 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ 5165 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ 5166 DW_CFA_nop, DW_CFA_nop, 5167 5168 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 5169 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 5170 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ 5171 0, 0, 0, 0, /* .plt size goes here */ 5172 0, /* Augmentation size */ 5173 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ 5174 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 5175 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ 5176 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */ 5177 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 5178 13, /* Block length */ 5179 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ 5180 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ 5181 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge, 5182 DW_OP_lit2, DW_OP_shl, DW_OP_plus, 5183 DW_CFA_nop, DW_CFA_nop 5184 }; 5185 5186 static const struct elf_i386_plt_layout elf_i386_nacl_plt = 5187 { 5188 elf_i386_nacl_plt0_entry, /* plt0_entry */ 5189 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */ 5190 2, /* plt0_got1_offset */ 5191 8, /* plt0_got2_offset */ 5192 elf_i386_nacl_plt_entry, /* plt_entry */ 5193 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */ 5194 2, /* plt_got_offset */ 5195 33, /* plt_reloc_offset */ 5196 38, /* plt_plt_offset */ 5197 32, /* plt_lazy_offset */ 5198 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */ 5199 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */ 5200 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */ 5201 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */ 5202 }; 5203 5204 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed = 5205 { 5206 &elf_i386_nacl_plt, /* plt */ 5207 0x90, /* plt0_pad_byte: nop insn */ 5208 0, /* is_vxworks */ 5209 }; 5210 5211 #undef elf_backend_arch_data 5212 #define elf_backend_arch_data &elf_i386_nacl_arch_bed 5213 5214 #include "elf32-target.h" 5215 5216 /* VxWorks support. */ 5217 5218 #undef TARGET_LITTLE_SYM 5219 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec 5220 #undef TARGET_LITTLE_NAME 5221 #define TARGET_LITTLE_NAME "elf32-i386-vxworks" 5222 #undef ELF_OSABI 5223 #undef elf_backend_plt_alignment 5224 #define elf_backend_plt_alignment 4 5225 5226 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed = 5227 { 5228 &elf_i386_plt, /* plt */ 5229 0x90, /* plt0_pad_byte */ 5230 1, /* is_vxworks */ 5231 }; 5232 5233 #undef elf_backend_arch_data 5234 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed 5235 5236 #undef elf_backend_relocs_compatible 5237 #undef elf_backend_post_process_headers 5238 #undef elf_backend_add_symbol_hook 5239 #define elf_backend_add_symbol_hook \ 5240 elf_vxworks_add_symbol_hook 5241 #undef elf_backend_link_output_symbol_hook 5242 #define elf_backend_link_output_symbol_hook \ 5243 elf_vxworks_link_output_symbol_hook 5244 #undef elf_backend_emit_relocs 5245 #define elf_backend_emit_relocs elf_vxworks_emit_relocs 5246 #undef elf_backend_final_write_processing 5247 #define elf_backend_final_write_processing \ 5248 elf_vxworks_final_write_processing 5249 #undef elf_backend_static_tls_alignment 5250 5251 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so 5252 define it. */ 5253 #undef elf_backend_want_plt_sym 5254 #define elf_backend_want_plt_sym 1 5255 5256 #undef elf32_bed 5257 #define elf32_bed elf32_i386_vxworks_bed 5258 5259 #include "elf32-target.h" 5260