elf32-i386.c revision 1.7
1/* Intel 80386/80486-specific support for 32-bit ELF 2 Copyright (C) 1993-2016 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21#include "sysdep.h" 22#include "bfd.h" 23#include "bfdlink.h" 24#include "libbfd.h" 25#include "elf-bfd.h" 26#include "elf-nacl.h" 27#include "elf-vxworks.h" 28#include "bfd_stdint.h" 29#include "objalloc.h" 30#include "hashtab.h" 31#include "dwarf2.h" 32#include "opcode/i386.h" 33 34/* 386 uses REL relocations instead of RELA. */ 35#define USE_REL 1 36 37#include "elf/i386.h" 38 39static reloc_howto_type elf_howto_table[]= 40{ 41 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont, 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 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, 136 bfd_elf_generic_reloc, "R_386_SIZE32", 137 TRUE, 0xffffffff, 0xffffffff, FALSE), 138 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 139 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC", 140 TRUE, 0xffffffff, 0xffffffff, FALSE), 141 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 142 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL", 143 FALSE, 0, 0, FALSE), 144 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 145 bfd_elf_generic_reloc, "R_386_TLS_DESC", 146 TRUE, 0xffffffff, 0xffffffff, FALSE), 147 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 148 bfd_elf_generic_reloc, "R_386_IRELATIVE", 149 TRUE, 0xffffffff, 0xffffffff, FALSE), 150 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 151 bfd_elf_generic_reloc, "R_386_GOT32X", 152 TRUE, 0xffffffff, 0xffffffff, FALSE), 153 154 /* Another gap. */ 155#define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset) 156#define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2) 157 158/* GNU extension to record C++ vtable hierarchy. */ 159 HOWTO (R_386_GNU_VTINHERIT, /* type */ 160 0, /* rightshift */ 161 2, /* size (0 = byte, 1 = short, 2 = long) */ 162 0, /* bitsize */ 163 FALSE, /* pc_relative */ 164 0, /* bitpos */ 165 complain_overflow_dont, /* complain_on_overflow */ 166 NULL, /* special_function */ 167 "R_386_GNU_VTINHERIT", /* name */ 168 FALSE, /* partial_inplace */ 169 0, /* src_mask */ 170 0, /* dst_mask */ 171 FALSE), /* pcrel_offset */ 172 173/* GNU extension to record C++ vtable member usage. */ 174 HOWTO (R_386_GNU_VTENTRY, /* type */ 175 0, /* rightshift */ 176 2, /* size (0 = byte, 1 = short, 2 = long) */ 177 0, /* bitsize */ 178 FALSE, /* pc_relative */ 179 0, /* bitpos */ 180 complain_overflow_dont, /* complain_on_overflow */ 181 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 182 "R_386_GNU_VTENTRY", /* name */ 183 FALSE, /* partial_inplace */ 184 0, /* src_mask */ 185 0, /* dst_mask */ 186 FALSE) /* pcrel_offset */ 187 188#define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset) 189 190}; 191 192#ifdef DEBUG_GEN_RELOC 193#define TRACE(str) \ 194 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) 195#else 196#define TRACE(str) 197#endif 198 199static reloc_howto_type * 200elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 201 bfd_reloc_code_real_type code) 202{ 203 switch (code) 204 { 205 case BFD_RELOC_NONE: 206 TRACE ("BFD_RELOC_NONE"); 207 return &elf_howto_table[R_386_NONE]; 208 209 case BFD_RELOC_32: 210 TRACE ("BFD_RELOC_32"); 211 return &elf_howto_table[R_386_32]; 212 213 case BFD_RELOC_CTOR: 214 TRACE ("BFD_RELOC_CTOR"); 215 return &elf_howto_table[R_386_32]; 216 217 case BFD_RELOC_32_PCREL: 218 TRACE ("BFD_RELOC_PC32"); 219 return &elf_howto_table[R_386_PC32]; 220 221 case BFD_RELOC_386_GOT32: 222 TRACE ("BFD_RELOC_386_GOT32"); 223 return &elf_howto_table[R_386_GOT32]; 224 225 case BFD_RELOC_386_PLT32: 226 TRACE ("BFD_RELOC_386_PLT32"); 227 return &elf_howto_table[R_386_PLT32]; 228 229 case BFD_RELOC_386_COPY: 230 TRACE ("BFD_RELOC_386_COPY"); 231 return &elf_howto_table[R_386_COPY]; 232 233 case BFD_RELOC_386_GLOB_DAT: 234 TRACE ("BFD_RELOC_386_GLOB_DAT"); 235 return &elf_howto_table[R_386_GLOB_DAT]; 236 237 case BFD_RELOC_386_JUMP_SLOT: 238 TRACE ("BFD_RELOC_386_JUMP_SLOT"); 239 return &elf_howto_table[R_386_JUMP_SLOT]; 240 241 case BFD_RELOC_386_RELATIVE: 242 TRACE ("BFD_RELOC_386_RELATIVE"); 243 return &elf_howto_table[R_386_RELATIVE]; 244 245 case BFD_RELOC_386_GOTOFF: 246 TRACE ("BFD_RELOC_386_GOTOFF"); 247 return &elf_howto_table[R_386_GOTOFF]; 248 249 case BFD_RELOC_386_GOTPC: 250 TRACE ("BFD_RELOC_386_GOTPC"); 251 return &elf_howto_table[R_386_GOTPC]; 252 253 /* These relocs are a GNU extension. */ 254 case BFD_RELOC_386_TLS_TPOFF: 255 TRACE ("BFD_RELOC_386_TLS_TPOFF"); 256 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset]; 257 258 case BFD_RELOC_386_TLS_IE: 259 TRACE ("BFD_RELOC_386_TLS_IE"); 260 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset]; 261 262 case BFD_RELOC_386_TLS_GOTIE: 263 TRACE ("BFD_RELOC_386_TLS_GOTIE"); 264 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset]; 265 266 case BFD_RELOC_386_TLS_LE: 267 TRACE ("BFD_RELOC_386_TLS_LE"); 268 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset]; 269 270 case BFD_RELOC_386_TLS_GD: 271 TRACE ("BFD_RELOC_386_TLS_GD"); 272 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset]; 273 274 case BFD_RELOC_386_TLS_LDM: 275 TRACE ("BFD_RELOC_386_TLS_LDM"); 276 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset]; 277 278 case BFD_RELOC_16: 279 TRACE ("BFD_RELOC_16"); 280 return &elf_howto_table[R_386_16 - R_386_ext_offset]; 281 282 case BFD_RELOC_16_PCREL: 283 TRACE ("BFD_RELOC_16_PCREL"); 284 return &elf_howto_table[R_386_PC16 - R_386_ext_offset]; 285 286 case BFD_RELOC_8: 287 TRACE ("BFD_RELOC_8"); 288 return &elf_howto_table[R_386_8 - R_386_ext_offset]; 289 290 case BFD_RELOC_8_PCREL: 291 TRACE ("BFD_RELOC_8_PCREL"); 292 return &elf_howto_table[R_386_PC8 - R_386_ext_offset]; 293 294 /* Common with Sun TLS implementation. */ 295 case BFD_RELOC_386_TLS_LDO_32: 296 TRACE ("BFD_RELOC_386_TLS_LDO_32"); 297 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset]; 298 299 case BFD_RELOC_386_TLS_IE_32: 300 TRACE ("BFD_RELOC_386_TLS_IE_32"); 301 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset]; 302 303 case BFD_RELOC_386_TLS_LE_32: 304 TRACE ("BFD_RELOC_386_TLS_LE_32"); 305 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset]; 306 307 case BFD_RELOC_386_TLS_DTPMOD32: 308 TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); 309 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset]; 310 311 case BFD_RELOC_386_TLS_DTPOFF32: 312 TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); 313 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset]; 314 315 case BFD_RELOC_386_TLS_TPOFF32: 316 TRACE ("BFD_RELOC_386_TLS_TPOFF32"); 317 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset]; 318 319 case BFD_RELOC_SIZE32: 320 TRACE ("BFD_RELOC_SIZE32"); 321 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset]; 322 323 case BFD_RELOC_386_TLS_GOTDESC: 324 TRACE ("BFD_RELOC_386_TLS_GOTDESC"); 325 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset]; 326 327 case BFD_RELOC_386_TLS_DESC_CALL: 328 TRACE ("BFD_RELOC_386_TLS_DESC_CALL"); 329 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset]; 330 331 case BFD_RELOC_386_TLS_DESC: 332 TRACE ("BFD_RELOC_386_TLS_DESC"); 333 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset]; 334 335 case BFD_RELOC_386_IRELATIVE: 336 TRACE ("BFD_RELOC_386_IRELATIVE"); 337 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset]; 338 339 case BFD_RELOC_386_GOT32X: 340 TRACE ("BFD_RELOC_386_GOT32X"); 341 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset]; 342 343 case BFD_RELOC_VTABLE_INHERIT: 344 TRACE ("BFD_RELOC_VTABLE_INHERIT"); 345 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset]; 346 347 case BFD_RELOC_VTABLE_ENTRY: 348 TRACE ("BFD_RELOC_VTABLE_ENTRY"); 349 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset]; 350 351 default: 352 break; 353 } 354 355 TRACE ("Unknown"); 356 return 0; 357} 358 359static reloc_howto_type * 360elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 361 const char *r_name) 362{ 363 unsigned int i; 364 365 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) 366 if (elf_howto_table[i].name != NULL 367 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 368 return &elf_howto_table[i]; 369 370 return NULL; 371} 372 373static reloc_howto_type * 374elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type) 375{ 376 unsigned int indx; 377 378 if ((indx = r_type) >= R_386_standard 379 && ((indx = r_type - R_386_ext_offset) - R_386_standard 380 >= R_386_ext - R_386_standard) 381 && ((indx = r_type - R_386_tls_offset) - R_386_ext 382 >= R_386_ext2 - R_386_ext) 383 && ((indx = r_type - R_386_vt_offset) - R_386_ext2 384 >= R_386_vt - R_386_ext2)) 385 { 386 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 387 abfd, (int) r_type); 388 indx = R_386_NONE; 389 } 390 /* PR 17512: file: 0f67f69d. */ 391 if (elf_howto_table [indx].type != r_type) 392 return NULL; 393 return &elf_howto_table[indx]; 394} 395 396static void 397elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, 398 arelent *cache_ptr, 399 Elf_Internal_Rela *dst) 400{ 401 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 402 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type); 403} 404 405/* Return whether a symbol name implies a local label. The UnixWare 406 2.1 cc generates temporary symbols that start with .X, so we 407 recognize them here. FIXME: do other SVR4 compilers also use .X?. 408 If so, we should move the .X recognition into 409 _bfd_elf_is_local_label_name. */ 410 411static bfd_boolean 412elf_i386_is_local_label_name (bfd *abfd, const char *name) 413{ 414 if (name[0] == '.' && name[1] == 'X') 415 return TRUE; 416 417 return _bfd_elf_is_local_label_name (abfd, name); 418} 419 420/* Support for core dump NOTE sections. */ 421 422static bfd_boolean 423elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 424{ 425 int offset; 426 size_t size; 427 428 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 429 { 430 int pr_version = bfd_get_32 (abfd, note->descdata); 431 432 if (pr_version != 1) 433 return FALSE; 434 435 /* pr_cursig */ 436 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20); 437 438 /* pr_pid */ 439 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 440 441 /* pr_reg */ 442 offset = 28; 443 size = bfd_get_32 (abfd, note->descdata + 8); 444 } 445 else 446 { 447 switch (note->descsz) 448 { 449 default: 450 return FALSE; 451 452 case 144: /* Linux/i386 */ 453 /* pr_cursig */ 454 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); 455 456 /* pr_pid */ 457 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); 458 459 /* pr_reg */ 460 offset = 72; 461 size = 68; 462 463 break; 464 } 465 } 466 467 /* Make a ".reg/999" section. */ 468 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 469 size, note->descpos + offset); 470} 471 472static bfd_boolean 473elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 474{ 475 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 476 { 477 int pr_version = bfd_get_32 (abfd, note->descdata); 478 479 if (pr_version != 1) 480 return FALSE; 481 482 elf_tdata (abfd)->core->program 483 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); 484 elf_tdata (abfd)->core->command 485 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); 486 } 487 else 488 { 489 switch (note->descsz) 490 { 491 default: 492 return FALSE; 493 494 case 124: /* Linux/i386 elf_prpsinfo. */ 495 elf_tdata (abfd)->core->pid 496 = bfd_get_32 (abfd, note->descdata + 12); 497 elf_tdata (abfd)->core->program 498 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 499 elf_tdata (abfd)->core->command 500 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 501 } 502 } 503 504 /* Note that for some reason, a spurious space is tacked 505 onto the end of the args in some (at least one anyway) 506 implementations, so strip it off if it exists. */ 507 { 508 char *command = elf_tdata (abfd)->core->command; 509 int n = strlen (command); 510 511 if (0 < n && command[n - 1] == ' ') 512 command[n - 1] = '\0'; 513 } 514 515 return TRUE; 516} 517 518/* Functions for the i386 ELF linker. 519 520 In order to gain some understanding of code in this file without 521 knowing all the intricate details of the linker, note the 522 following: 523 524 Functions named elf_i386_* are called by external routines, other 525 functions are only called locally. elf_i386_* functions appear 526 in this file more or less in the order in which they are called 527 from external routines. eg. elf_i386_check_relocs is called 528 early in the link process, elf_i386_finish_dynamic_sections is 529 one of the last functions. */ 530 531 532/* The name of the dynamic interpreter. This is put in the .interp 533 section. */ 534 535#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 536 537/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 538 copying dynamic variables from a shared lib into an app's dynbss 539 section, and instead use a dynamic relocation to point into the 540 shared lib. */ 541#define ELIMINATE_COPY_RELOCS 1 542 543/* The size in bytes of an entry in the procedure linkage table. */ 544 545#define PLT_ENTRY_SIZE 16 546 547/* The first entry in an absolute procedure linkage table looks like 548 this. See the SVR4 ABI i386 supplement to see how this works. 549 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ 550 551static const bfd_byte elf_i386_plt0_entry[12] = 552{ 553 0xff, 0x35, /* pushl contents of address */ 554 0, 0, 0, 0, /* replaced with address of .got + 4. */ 555 0xff, 0x25, /* jmp indirect */ 556 0, 0, 0, 0 /* replaced with address of .got + 8. */ 557}; 558 559/* Subsequent entries in an absolute procedure linkage table look like 560 this. */ 561 562static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = 563{ 564 0xff, 0x25, /* jmp indirect */ 565 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ 566 0x68, /* pushl immediate */ 567 0, 0, 0, 0, /* replaced with offset into relocation table. */ 568 0xe9, /* jmp relative */ 569 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 570}; 571 572/* The first entry in a PIC procedure linkage table look like this. 573 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ 574 575static const bfd_byte elf_i386_pic_plt0_entry[12] = 576{ 577 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ 578 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */ 579}; 580 581/* Subsequent entries in a PIC procedure linkage table look like this. */ 582 583static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = 584{ 585 0xff, 0xa3, /* jmp *offset(%ebx) */ 586 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 587 0x68, /* pushl immediate */ 588 0, 0, 0, 0, /* replaced with offset into relocation table. */ 589 0xe9, /* jmp relative */ 590 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 591}; 592 593/* Entries in the GOT procedure linkage table look like this. */ 594 595static const bfd_byte elf_i386_got_plt_entry[8] = 596{ 597 0xff, 0x25, /* jmp indirect */ 598 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 599 0x66, 0x90 /* xchg %ax,%ax */ 600}; 601 602/* Entries in the PIC GOT procedure linkage table look like this. */ 603 604static const bfd_byte elf_i386_pic_got_plt_entry[8] = 605{ 606 0xff, 0xa3, /* jmp *offset(%ebx) */ 607 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 608 0x66, 0x90 /* xchg %ax,%ax */ 609}; 610 611/* .eh_frame covering the .plt section. */ 612 613static const bfd_byte elf_i386_eh_frame_plt[] = 614{ 615#define PLT_CIE_LENGTH 20 616#define PLT_FDE_LENGTH 36 617#define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8 618#define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12 619 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 620 0, 0, 0, 0, /* CIE ID */ 621 1, /* CIE version */ 622 'z', 'R', 0, /* Augmentation string */ 623 1, /* Code alignment factor */ 624 0x7c, /* Data alignment factor */ 625 8, /* Return address column */ 626 1, /* Augmentation size */ 627 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 628 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ 629 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ 630 DW_CFA_nop, DW_CFA_nop, 631 632 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 633 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 634 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ 635 0, 0, 0, 0, /* .plt size goes here */ 636 0, /* Augmentation size */ 637 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ 638 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 639 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ 640 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ 641 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 642 11, /* Block length */ 643 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ 644 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ 645 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, 646 DW_OP_lit2, DW_OP_shl, DW_OP_plus, 647 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop 648}; 649 650struct elf_i386_plt_layout 651{ 652 /* The first entry in an absolute procedure linkage table looks like this. */ 653 const bfd_byte *plt0_entry; 654 unsigned int plt0_entry_size; 655 656 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */ 657 unsigned int plt0_got1_offset; 658 unsigned int plt0_got2_offset; 659 660 /* Later entries in an absolute procedure linkage table look like this. */ 661 const bfd_byte *plt_entry; 662 unsigned int plt_entry_size; 663 664 /* Offsets into plt_entry that are to be replaced with... */ 665 unsigned int plt_got_offset; /* ... address of this symbol in .got. */ 666 unsigned int plt_reloc_offset; /* ... offset into relocation table. */ 667 unsigned int plt_plt_offset; /* ... offset to start of .plt. */ 668 669 /* Offset into plt_entry where the initial value of the GOT entry points. */ 670 unsigned int plt_lazy_offset; 671 672 /* The first entry in a PIC procedure linkage table looks like this. */ 673 const bfd_byte *pic_plt0_entry; 674 675 /* Subsequent entries in a PIC procedure linkage table look like this. */ 676 const bfd_byte *pic_plt_entry; 677 678 /* .eh_frame covering the .plt section. */ 679 const bfd_byte *eh_frame_plt; 680 unsigned int eh_frame_plt_size; 681}; 682 683#define GET_PLT_ENTRY_SIZE(abfd) \ 684 get_elf_i386_backend_data (abfd)->plt->plt_entry_size 685 686/* These are the standard parameters. */ 687static const struct elf_i386_plt_layout elf_i386_plt = 688 { 689 elf_i386_plt0_entry, /* plt0_entry */ 690 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */ 691 2, /* plt0_got1_offset */ 692 8, /* plt0_got2_offset */ 693 elf_i386_plt_entry, /* plt_entry */ 694 PLT_ENTRY_SIZE, /* plt_entry_size */ 695 2, /* plt_got_offset */ 696 7, /* plt_reloc_offset */ 697 12, /* plt_plt_offset */ 698 6, /* plt_lazy_offset */ 699 elf_i386_pic_plt0_entry, /* pic_plt0_entry */ 700 elf_i386_pic_plt_entry, /* pic_plt_entry */ 701 elf_i386_eh_frame_plt, /* eh_frame_plt */ 702 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */ 703 }; 704 705 706/* On VxWorks, the .rel.plt.unloaded section has absolute relocations 707 for the PLTResolve stub and then for each PLT entry. */ 708#define PLTRESOLVE_RELOCS_SHLIB 0 709#define PLTRESOLVE_RELOCS 2 710#define PLT_NON_JUMP_SLOT_RELOCS 2 711 712/* Architecture-specific backend data for i386. */ 713 714struct elf_i386_backend_data 715{ 716 /* Parameters describing PLT generation. */ 717 const struct elf_i386_plt_layout *plt; 718 719 /* Value used to fill the unused bytes of the first PLT entry. */ 720 bfd_byte plt0_pad_byte; 721 722 /* True if the target system is VxWorks. */ 723 int is_vxworks; 724}; 725 726#define get_elf_i386_backend_data(abfd) \ 727 ((const struct elf_i386_backend_data *) \ 728 get_elf_backend_data (abfd)->arch_data) 729 730/* These are the standard parameters. */ 731static const struct elf_i386_backend_data elf_i386_arch_bed = 732 { 733 &elf_i386_plt, /* plt */ 734 0, /* plt0_pad_byte */ 735 0, /* is_vxworks */ 736 }; 737 738#define elf_backend_arch_data &elf_i386_arch_bed 739 740/* Is a undefined weak symbol which is resolved to 0. Reference to an 741 undefined weak symbol is resolved to 0 when building executable if 742 it isn't dynamic and 743 1. Has non-GOT/non-PLT relocations in text section. Or 744 2. Has no GOT/PLT relocation. 745 */ 746#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \ 747 ((EH)->elf.root.type == bfd_link_hash_undefweak \ 748 && bfd_link_executable (INFO) \ 749 && (elf_i386_hash_table (INFO)->interp == NULL \ 750 || !(GOT_RELOC) \ 751 || (EH)->has_non_got_reloc \ 752 || !(INFO)->dynamic_undefined_weak)) 753 754/* i386 ELF linker hash entry. */ 755 756struct elf_i386_link_hash_entry 757{ 758 struct elf_link_hash_entry elf; 759 760 /* Track dynamic relocs copied for this symbol. */ 761 struct elf_dyn_relocs *dyn_relocs; 762 763#define GOT_UNKNOWN 0 764#define GOT_NORMAL 1 765#define GOT_TLS_GD 2 766#define GOT_TLS_IE 4 767#define GOT_TLS_IE_POS 5 768#define GOT_TLS_IE_NEG 6 769#define GOT_TLS_IE_BOTH 7 770#define GOT_TLS_GDESC 8 771#define GOT_TLS_GD_BOTH_P(type) \ 772 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) 773#define GOT_TLS_GD_P(type) \ 774 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) 775#define GOT_TLS_GDESC_P(type) \ 776 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) 777#define GOT_TLS_GD_ANY_P(type) \ 778 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) 779 unsigned char tls_type; 780 781 /* Symbol is referenced by R_386_GOTOFF relocation. */ 782 unsigned int gotoff_ref : 1; 783 784 /* Symbol has GOT or PLT relocations. */ 785 unsigned int has_got_reloc : 1; 786 787 /* Symbol has non-GOT/non-PLT relocations in text sections. */ 788 unsigned int has_non_got_reloc : 1; 789 790 /* 0: symbol isn't ___tls_get_addr. 791 1: symbol is ___tls_get_addr. 792 2: symbol is unknown. */ 793 unsigned int tls_get_addr : 2; 794 795 /* Reference count of C/C++ function pointer relocations in read-write 796 section which can be resolved at run-time. */ 797 bfd_signed_vma func_pointer_refcount; 798 799 /* Information about the GOT PLT entry. Filled when there are both 800 GOT and PLT relocations against the same function. */ 801 union gotplt_union plt_got; 802 803 /* Offset of the GOTPLT entry reserved for the TLS descriptor, 804 starting at the end of the jump table. */ 805 bfd_vma tlsdesc_got; 806}; 807 808#define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent)) 809 810struct elf_i386_obj_tdata 811{ 812 struct elf_obj_tdata root; 813 814 /* tls_type for each local got entry. */ 815 char *local_got_tls_type; 816 817 /* GOTPLT entries for TLS descriptors. */ 818 bfd_vma *local_tlsdesc_gotent; 819}; 820 821#define elf_i386_tdata(abfd) \ 822 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any) 823 824#define elf_i386_local_got_tls_type(abfd) \ 825 (elf_i386_tdata (abfd)->local_got_tls_type) 826 827#define elf_i386_local_tlsdesc_gotent(abfd) \ 828 (elf_i386_tdata (abfd)->local_tlsdesc_gotent) 829 830#define is_i386_elf(bfd) \ 831 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ 832 && elf_tdata (bfd) != NULL \ 833 && elf_object_id (bfd) == I386_ELF_DATA) 834 835static bfd_boolean 836elf_i386_mkobject (bfd *abfd) 837{ 838 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata), 839 I386_ELF_DATA); 840} 841 842/* i386 ELF linker hash table. */ 843 844struct elf_i386_link_hash_table 845{ 846 struct elf_link_hash_table elf; 847 848 /* Short-cuts to get to dynamic linker sections. */ 849 asection *interp; 850 asection *sdynbss; 851 asection *srelbss; 852 asection *plt_eh_frame; 853 asection *plt_got; 854 855 union 856 { 857 bfd_signed_vma refcount; 858 bfd_vma offset; 859 } tls_ldm_got; 860 861 /* The amount of space used by the reserved portion of the sgotplt 862 section, plus whatever space is used by the jump slots. */ 863 bfd_vma sgotplt_jump_table_size; 864 865 /* Small local sym cache. */ 866 struct sym_cache sym_cache; 867 868 /* _TLS_MODULE_BASE_ symbol. */ 869 struct bfd_link_hash_entry *tls_module_base; 870 871 /* Used by local STT_GNU_IFUNC symbols. */ 872 htab_t loc_hash_table; 873 void * loc_hash_memory; 874 875 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */ 876 asection *srelplt2; 877 878 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */ 879 bfd_vma next_tls_desc_index; 880 881 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */ 882 bfd_vma next_jump_slot_index; 883 884 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */ 885 bfd_vma next_irelative_index; 886 887 /* TRUE if there are dynamic relocs against IFUNC symbols that apply 888 to read-only sections. */ 889 bfd_boolean readonly_dynrelocs_against_ifunc; 890}; 891 892/* Get the i386 ELF linker hash table from a link_info structure. */ 893 894#define elf_i386_hash_table(p) \ 895 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ 896 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL) 897 898#define elf_i386_compute_jump_table_size(htab) \ 899 ((htab)->elf.srelplt->reloc_count * 4) 900 901/* Create an entry in an i386 ELF linker hash table. */ 902 903static struct bfd_hash_entry * 904elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry, 905 struct bfd_hash_table *table, 906 const char *string) 907{ 908 /* Allocate the structure if it has not already been allocated by a 909 subclass. */ 910 if (entry == NULL) 911 { 912 entry = (struct bfd_hash_entry *) 913 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry)); 914 if (entry == NULL) 915 return entry; 916 } 917 918 /* Call the allocation method of the superclass. */ 919 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 920 if (entry != NULL) 921 { 922 struct elf_i386_link_hash_entry *eh; 923 924 eh = (struct elf_i386_link_hash_entry *) entry; 925 eh->dyn_relocs = NULL; 926 eh->tls_type = GOT_UNKNOWN; 927 eh->gotoff_ref = 0; 928 eh->has_got_reloc = 0; 929 eh->has_non_got_reloc = 0; 930 eh->tls_get_addr = 2; 931 eh->func_pointer_refcount = 0; 932 eh->plt_got.offset = (bfd_vma) -1; 933 eh->tlsdesc_got = (bfd_vma) -1; 934 } 935 936 return entry; 937} 938 939/* Compute a hash of a local hash entry. We use elf_link_hash_entry 940 for local symbol so that we can handle local STT_GNU_IFUNC symbols 941 as global symbol. We reuse indx and dynstr_index for local symbol 942 hash since they aren't used by global symbols in this backend. */ 943 944static hashval_t 945elf_i386_local_htab_hash (const void *ptr) 946{ 947 struct elf_link_hash_entry *h 948 = (struct elf_link_hash_entry *) ptr; 949 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); 950} 951 952/* Compare local hash entries. */ 953 954static int 955elf_i386_local_htab_eq (const void *ptr1, const void *ptr2) 956{ 957 struct elf_link_hash_entry *h1 958 = (struct elf_link_hash_entry *) ptr1; 959 struct elf_link_hash_entry *h2 960 = (struct elf_link_hash_entry *) ptr2; 961 962 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; 963} 964 965/* Find and/or create a hash entry for local symbol. */ 966 967static struct elf_link_hash_entry * 968elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab, 969 bfd *abfd, const Elf_Internal_Rela *rel, 970 bfd_boolean create) 971{ 972 struct elf_i386_link_hash_entry e, *ret; 973 asection *sec = abfd->sections; 974 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, 975 ELF32_R_SYM (rel->r_info)); 976 void **slot; 977 978 e.elf.indx = sec->id; 979 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info); 980 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, 981 create ? INSERT : NO_INSERT); 982 983 if (!slot) 984 return NULL; 985 986 if (*slot) 987 { 988 ret = (struct elf_i386_link_hash_entry *) *slot; 989 return &ret->elf; 990 } 991 992 ret = (struct elf_i386_link_hash_entry *) 993 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, 994 sizeof (struct elf_i386_link_hash_entry)); 995 if (ret) 996 { 997 memset (ret, 0, sizeof (*ret)); 998 ret->elf.indx = sec->id; 999 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info); 1000 ret->elf.dynindx = -1; 1001 ret->func_pointer_refcount = 0; 1002 ret->plt_got.offset = (bfd_vma) -1; 1003 *slot = ret; 1004 } 1005 return &ret->elf; 1006} 1007 1008/* Destroy an i386 ELF linker hash table. */ 1009 1010static void 1011elf_i386_link_hash_table_free (bfd *obfd) 1012{ 1013 struct elf_i386_link_hash_table *htab 1014 = (struct elf_i386_link_hash_table *) obfd->link.hash; 1015 1016 if (htab->loc_hash_table) 1017 htab_delete (htab->loc_hash_table); 1018 if (htab->loc_hash_memory) 1019 objalloc_free ((struct objalloc *) htab->loc_hash_memory); 1020 _bfd_elf_link_hash_table_free (obfd); 1021} 1022 1023/* Create an i386 ELF linker hash table. */ 1024 1025static struct bfd_link_hash_table * 1026elf_i386_link_hash_table_create (bfd *abfd) 1027{ 1028 struct elf_i386_link_hash_table *ret; 1029 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); 1030 1031 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt); 1032 if (ret == NULL) 1033 return NULL; 1034 1035 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, 1036 elf_i386_link_hash_newfunc, 1037 sizeof (struct elf_i386_link_hash_entry), 1038 I386_ELF_DATA)) 1039 { 1040 free (ret); 1041 return NULL; 1042 } 1043 1044 ret->loc_hash_table = htab_try_create (1024, 1045 elf_i386_local_htab_hash, 1046 elf_i386_local_htab_eq, 1047 NULL); 1048 ret->loc_hash_memory = objalloc_create (); 1049 if (!ret->loc_hash_table || !ret->loc_hash_memory) 1050 { 1051 elf_i386_link_hash_table_free (abfd); 1052 return NULL; 1053 } 1054 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free; 1055 1056 return &ret->elf.root; 1057} 1058 1059/* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and 1060 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our 1061 hash table. */ 1062 1063static bfd_boolean 1064elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 1065{ 1066 struct elf_i386_link_hash_table *htab; 1067 1068 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 1069 return FALSE; 1070 1071 htab = elf_i386_hash_table (info); 1072 if (htab == NULL) 1073 return FALSE; 1074 1075 /* Set the contents of the .interp section to the interpreter. */ 1076 if (bfd_link_executable (info) && !info->nointerp) 1077 { 1078 asection *s = bfd_get_linker_section (dynobj, ".interp"); 1079 if (s == NULL) 1080 abort (); 1081 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1082 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1083 htab->interp = s; 1084 } 1085 1086 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss"); 1087 if (!htab->sdynbss) 1088 abort (); 1089 1090 if (bfd_link_executable (info)) 1091 { 1092 /* Always allow copy relocs for building executables. */ 1093 asection *s = bfd_get_linker_section (dynobj, ".rel.bss"); 1094 if (s == NULL) 1095 { 1096 const struct elf_backend_data *bed = get_elf_backend_data (dynobj); 1097 s = bfd_make_section_anyway_with_flags (dynobj, 1098 ".rel.bss", 1099 (bed->dynamic_sec_flags 1100 | SEC_READONLY)); 1101 if (s == NULL 1102 || ! bfd_set_section_alignment (dynobj, s, 1103 bed->s->log_file_align)) 1104 return FALSE; 1105 } 1106 htab->srelbss = s; 1107 } 1108 1109 if (get_elf_i386_backend_data (dynobj)->is_vxworks 1110 && !elf_vxworks_create_dynamic_sections (dynobj, info, 1111 &htab->srelplt2)) 1112 return FALSE; 1113 1114 if (!info->no_ld_generated_unwind_info 1115 && htab->plt_eh_frame == NULL 1116 && htab->elf.splt != NULL) 1117 { 1118 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY 1119 | SEC_HAS_CONTENTS | SEC_IN_MEMORY 1120 | SEC_LINKER_CREATED); 1121 htab->plt_eh_frame 1122 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags); 1123 if (htab->plt_eh_frame == NULL 1124 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2)) 1125 return FALSE; 1126 } 1127 1128 return TRUE; 1129} 1130 1131/* Copy the extra info we tack onto an elf_link_hash_entry. */ 1132 1133static void 1134elf_i386_copy_indirect_symbol (struct bfd_link_info *info, 1135 struct elf_link_hash_entry *dir, 1136 struct elf_link_hash_entry *ind) 1137{ 1138 struct elf_i386_link_hash_entry *edir, *eind; 1139 1140 edir = (struct elf_i386_link_hash_entry *) dir; 1141 eind = (struct elf_i386_link_hash_entry *) ind; 1142 1143 if (eind->dyn_relocs != NULL) 1144 { 1145 if (edir->dyn_relocs != NULL) 1146 { 1147 struct elf_dyn_relocs **pp; 1148 struct elf_dyn_relocs *p; 1149 1150 /* Add reloc counts against the indirect sym to the direct sym 1151 list. Merge any entries against the same section. */ 1152 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 1153 { 1154 struct elf_dyn_relocs *q; 1155 1156 for (q = edir->dyn_relocs; q != NULL; q = q->next) 1157 if (q->sec == p->sec) 1158 { 1159 q->pc_count += p->pc_count; 1160 q->count += p->count; 1161 *pp = p->next; 1162 break; 1163 } 1164 if (q == NULL) 1165 pp = &p->next; 1166 } 1167 *pp = edir->dyn_relocs; 1168 } 1169 1170 edir->dyn_relocs = eind->dyn_relocs; 1171 eind->dyn_relocs = NULL; 1172 } 1173 1174 if (ind->root.type == bfd_link_hash_indirect 1175 && dir->got.refcount <= 0) 1176 { 1177 edir->tls_type = eind->tls_type; 1178 eind->tls_type = GOT_UNKNOWN; 1179 } 1180 1181 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will 1182 generate a R_386_COPY reloc. */ 1183 edir->gotoff_ref |= eind->gotoff_ref; 1184 1185 edir->has_got_reloc |= eind->has_got_reloc; 1186 edir->has_non_got_reloc |= eind->has_non_got_reloc; 1187 1188 if (ELIMINATE_COPY_RELOCS 1189 && ind->root.type != bfd_link_hash_indirect 1190 && dir->dynamic_adjusted) 1191 { 1192 /* If called to transfer flags for a weakdef during processing 1193 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 1194 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 1195 dir->ref_dynamic |= ind->ref_dynamic; 1196 dir->ref_regular |= ind->ref_regular; 1197 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 1198 dir->needs_plt |= ind->needs_plt; 1199 dir->pointer_equality_needed |= ind->pointer_equality_needed; 1200 } 1201 else 1202 { 1203 if (eind->func_pointer_refcount > 0) 1204 { 1205 edir->func_pointer_refcount += eind->func_pointer_refcount; 1206 eind->func_pointer_refcount = 0; 1207 } 1208 1209 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 1210 } 1211} 1212 1213/* Return TRUE if the TLS access code sequence support transition 1214 from R_TYPE. */ 1215 1216static bfd_boolean 1217elf_i386_check_tls_transition (asection *sec, 1218 bfd_byte *contents, 1219 Elf_Internal_Shdr *symtab_hdr, 1220 struct elf_link_hash_entry **sym_hashes, 1221 unsigned int r_type, 1222 const Elf_Internal_Rela *rel, 1223 const Elf_Internal_Rela *relend) 1224{ 1225 unsigned int val, type, reg; 1226 unsigned long r_symndx; 1227 struct elf_link_hash_entry *h; 1228 bfd_vma offset; 1229 bfd_byte *call; 1230 bfd_boolean indirect_call, tls_get_addr; 1231 1232 offset = rel->r_offset; 1233 switch (r_type) 1234 { 1235 case R_386_TLS_GD: 1236 case R_386_TLS_LDM: 1237 if (offset < 2 || (rel + 1) >= relend) 1238 return FALSE; 1239 1240 indirect_call = FALSE; 1241 call = contents + offset + 4; 1242 val = *(call - 5); 1243 type = *(call - 6); 1244 if (r_type == R_386_TLS_GD) 1245 { 1246 /* Check transition from GD access model. Only 1247 leal foo@tlsgd(,%ebx,1), %eax 1248 call ___tls_get_addr@PLT 1249 or 1250 leal foo@tlsgd(%ebx) %eax 1251 call ___tls_get_addr@PLT 1252 nop 1253 or 1254 leal foo@tlsgd(%reg), %eax 1255 call *___tls_get_addr@GOT(%reg) 1256 which may be converted to 1257 addr32 call ___tls_get_addr 1258 can transit to different access model. */ 1259 if ((offset + 10) > sec->size 1260 || (type != 0x8d && type != 0x04)) 1261 return FALSE; 1262 1263 if (type == 0x04) 1264 { 1265 /* leal foo@tlsgd(,%ebx,1), %eax 1266 call ___tls_get_addr@PLT */ 1267 if (offset < 3) 1268 return FALSE; 1269 1270 if (*(call - 7) != 0x8d 1271 || val != 0x1d 1272 || call[0] != 0xe8) 1273 return FALSE; 1274 } 1275 else 1276 { 1277 /* This must be 1278 leal foo@tlsgd(%ebx), %eax 1279 call ___tls_get_addr@PLT 1280 nop 1281 or 1282 leal foo@tlsgd(%reg), %eax 1283 call *___tls_get_addr@GOT(%reg) 1284 which may be converted to 1285 addr32 call ___tls_get_addr 1286 1287 %eax can't be used as the GOT base register since it 1288 is used to pass parameter to ___tls_get_addr. */ 1289 reg = val & 7; 1290 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0) 1291 return FALSE; 1292 1293 indirect_call = call[0] == 0xff; 1294 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90) 1295 && !(call[0] == 0x67 && call[1] == 0xe8) 1296 && !(indirect_call 1297 && (call[1] & 0xf8) == 0x90 1298 && (call[1] & 0x7) == reg)) 1299 return FALSE; 1300 } 1301 } 1302 else 1303 { 1304 /* Check transition from LD access model. Only 1305 leal foo@tlsldm(%ebx), %eax 1306 call ___tls_get_addr@PLT 1307 or 1308 leal foo@tlsldm(%reg), %eax 1309 call *___tls_get_addr@GOT(%reg) 1310 which may be converted to 1311 addr32 call ___tls_get_addr 1312 can transit to different access model. */ 1313 if (type != 0x8d || (offset + 9) > sec->size) 1314 return FALSE; 1315 1316 /* %eax can't be used as the GOT base register since it is 1317 used to pass parameter to ___tls_get_addr. */ 1318 reg = val & 7; 1319 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0) 1320 return FALSE; 1321 1322 indirect_call = call[0] == 0xff; 1323 if (!(reg == 3 && call[0] == 0xe8) 1324 && !(call[0] == 0x67 && call[1] == 0xe8) 1325 && !(indirect_call 1326 && (call[1] & 0xf8) == 0x90 1327 && (call[1] & 0x7) == reg)) 1328 return FALSE; 1329 } 1330 1331 r_symndx = ELF32_R_SYM (rel[1].r_info); 1332 if (r_symndx < symtab_hdr->sh_info) 1333 return FALSE; 1334 1335 tls_get_addr = FALSE; 1336 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1337 if (h != NULL && h->root.root.string != NULL) 1338 { 1339 struct elf_i386_link_hash_entry *eh 1340 = (struct elf_i386_link_hash_entry *) h; 1341 tls_get_addr = eh->tls_get_addr == 1; 1342 if (eh->tls_get_addr > 1) 1343 { 1344 /* Use strncmp to check ___tls_get_addr since 1345 ___tls_get_addr may be versioned. */ 1346 if (strncmp (h->root.root.string, "___tls_get_addr", 15) 1347 == 0) 1348 { 1349 eh->tls_get_addr = 1; 1350 tls_get_addr = TRUE; 1351 } 1352 else 1353 eh->tls_get_addr = 0; 1354 } 1355 } 1356 1357 if (!tls_get_addr) 1358 return FALSE; 1359 else if (indirect_call) 1360 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X); 1361 else 1362 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32 1363 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 1364 1365 case R_386_TLS_IE: 1366 /* Check transition from IE access model: 1367 movl foo@indntpoff(%rip), %eax 1368 movl foo@indntpoff(%rip), %reg 1369 addl foo@indntpoff(%rip), %reg 1370 */ 1371 1372 if (offset < 1 || (offset + 4) > sec->size) 1373 return FALSE; 1374 1375 /* Check "movl foo@tpoff(%rip), %eax" first. */ 1376 val = bfd_get_8 (abfd, contents + offset - 1); 1377 if (val == 0xa1) 1378 return TRUE; 1379 1380 if (offset < 2) 1381 return FALSE; 1382 1383 /* Check movl|addl foo@tpoff(%rip), %reg. */ 1384 type = bfd_get_8 (abfd, contents + offset - 2); 1385 return ((type == 0x8b || type == 0x03) 1386 && (val & 0xc7) == 0x05); 1387 1388 case R_386_TLS_GOTIE: 1389 case R_386_TLS_IE_32: 1390 /* Check transition from {IE_32,GOTIE} access model: 1391 subl foo@{tpoff,gontoff}(%reg1), %reg2 1392 movl foo@{tpoff,gontoff}(%reg1), %reg2 1393 addl foo@{tpoff,gontoff}(%reg1), %reg2 1394 */ 1395 1396 if (offset < 2 || (offset + 4) > sec->size) 1397 return FALSE; 1398 1399 val = bfd_get_8 (abfd, contents + offset - 1); 1400 if ((val & 0xc0) != 0x80 || (val & 7) == 4) 1401 return FALSE; 1402 1403 type = bfd_get_8 (abfd, contents + offset - 2); 1404 return type == 0x8b || type == 0x2b || type == 0x03; 1405 1406 case R_386_TLS_GOTDESC: 1407 /* Check transition from GDesc access model: 1408 leal x@tlsdesc(%ebx), %eax 1409 1410 Make sure it's a leal adding ebx to a 32-bit offset 1411 into any register, although it's probably almost always 1412 going to be eax. */ 1413 1414 if (offset < 2 || (offset + 4) > sec->size) 1415 return FALSE; 1416 1417 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) 1418 return FALSE; 1419 1420 val = bfd_get_8 (abfd, contents + offset - 1); 1421 return (val & 0xc7) == 0x83; 1422 1423 case R_386_TLS_DESC_CALL: 1424 /* Check transition from GDesc access model: 1425 call *x@tlsdesc(%eax) 1426 */ 1427 if (offset + 2 <= sec->size) 1428 { 1429 /* Make sure that it's a call *x@tlsdesc(%eax). */ 1430 call = contents + offset; 1431 return call[0] == 0xff && call[1] == 0x10; 1432 } 1433 1434 return FALSE; 1435 1436 default: 1437 abort (); 1438 } 1439} 1440 1441/* Return TRUE if the TLS access transition is OK or no transition 1442 will be performed. Update R_TYPE if there is a transition. */ 1443 1444static bfd_boolean 1445elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd, 1446 asection *sec, bfd_byte *contents, 1447 Elf_Internal_Shdr *symtab_hdr, 1448 struct elf_link_hash_entry **sym_hashes, 1449 unsigned int *r_type, int tls_type, 1450 const Elf_Internal_Rela *rel, 1451 const Elf_Internal_Rela *relend, 1452 struct elf_link_hash_entry *h, 1453 unsigned long r_symndx, 1454 bfd_boolean from_relocate_section) 1455{ 1456 unsigned int from_type = *r_type; 1457 unsigned int to_type = from_type; 1458 bfd_boolean check = TRUE; 1459 1460 /* Skip TLS transition for functions. */ 1461 if (h != NULL 1462 && (h->type == STT_FUNC 1463 || h->type == STT_GNU_IFUNC)) 1464 return TRUE; 1465 1466 switch (from_type) 1467 { 1468 case R_386_TLS_GD: 1469 case R_386_TLS_GOTDESC: 1470 case R_386_TLS_DESC_CALL: 1471 case R_386_TLS_IE_32: 1472 case R_386_TLS_IE: 1473 case R_386_TLS_GOTIE: 1474 if (bfd_link_executable (info)) 1475 { 1476 if (h == NULL) 1477 to_type = R_386_TLS_LE_32; 1478 else if (from_type != R_386_TLS_IE 1479 && from_type != R_386_TLS_GOTIE) 1480 to_type = R_386_TLS_IE_32; 1481 } 1482 1483 /* When we are called from elf_i386_relocate_section, there may 1484 be additional transitions based on TLS_TYPE. */ 1485 if (from_relocate_section) 1486 { 1487 unsigned int new_to_type = to_type; 1488 1489 if (bfd_link_executable (info) 1490 && h != NULL 1491 && h->dynindx == -1 1492 && (tls_type & GOT_TLS_IE)) 1493 new_to_type = R_386_TLS_LE_32; 1494 1495 if (to_type == R_386_TLS_GD 1496 || to_type == R_386_TLS_GOTDESC 1497 || to_type == R_386_TLS_DESC_CALL) 1498 { 1499 if (tls_type == GOT_TLS_IE_POS) 1500 new_to_type = R_386_TLS_GOTIE; 1501 else if (tls_type & GOT_TLS_IE) 1502 new_to_type = R_386_TLS_IE_32; 1503 } 1504 1505 /* We checked the transition before when we were called from 1506 elf_i386_check_relocs. We only want to check the new 1507 transition which hasn't been checked before. */ 1508 check = new_to_type != to_type && from_type == to_type; 1509 to_type = new_to_type; 1510 } 1511 1512 break; 1513 1514 case R_386_TLS_LDM: 1515 if (bfd_link_executable (info)) 1516 to_type = R_386_TLS_LE_32; 1517 break; 1518 1519 default: 1520 return TRUE; 1521 } 1522 1523 /* Return TRUE if there is no transition. */ 1524 if (from_type == to_type) 1525 return TRUE; 1526 1527 /* Check if the transition can be performed. */ 1528 if (check 1529 && ! elf_i386_check_tls_transition (sec, contents, 1530 symtab_hdr, sym_hashes, 1531 from_type, rel, relend)) 1532 { 1533 reloc_howto_type *from, *to; 1534 const char *name; 1535 1536 from = elf_i386_rtype_to_howto (abfd, from_type); 1537 to = elf_i386_rtype_to_howto (abfd, to_type); 1538 1539 if (h) 1540 name = h->root.root.string; 1541 else 1542 { 1543 struct elf_i386_link_hash_table *htab; 1544 1545 htab = elf_i386_hash_table (info); 1546 if (htab == NULL) 1547 name = "*unknown*"; 1548 else 1549 { 1550 Elf_Internal_Sym *isym; 1551 1552 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1553 abfd, r_symndx); 1554 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); 1555 } 1556 } 1557 1558 (*_bfd_error_handler) 1559 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx " 1560 "in section `%A' failed"), 1561 abfd, sec, from->name, to->name, name, 1562 (unsigned long) rel->r_offset); 1563 bfd_set_error (bfd_error_bad_value); 1564 return FALSE; 1565 } 1566 1567 *r_type = to_type; 1568 return TRUE; 1569} 1570 1571/* With the local symbol, foo, we convert 1572 mov foo@GOT[(%reg1)], %reg2 1573 to 1574 lea foo[@GOTOFF(%reg1)], %reg2 1575 and convert 1576 call/jmp *foo@GOT[(%reg)] 1577 to 1578 nop call foo/jmp foo nop 1579 When PIC is false, convert 1580 test %reg1, foo@GOT[(%reg2)] 1581 to 1582 test $foo, %reg1 1583 and convert 1584 binop foo@GOT[(%reg1)], %reg2 1585 to 1586 binop $foo, %reg2 1587 where binop is one of adc, add, and, cmp, or, sbb, sub, xor 1588 instructions. */ 1589 1590static 1591bfd_boolean 1592elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr, 1593 bfd_byte *contents, 1594 Elf_Internal_Rela *irel, 1595 struct elf_link_hash_entry *h, 1596 bfd_boolean *converted, 1597 struct bfd_link_info *link_info) 1598{ 1599 struct elf_i386_link_hash_table *htab; 1600 unsigned int opcode; 1601 unsigned int modrm; 1602 bfd_boolean baseless; 1603 Elf_Internal_Sym *isym; 1604 unsigned int addend; 1605 unsigned int nop; 1606 bfd_vma nop_offset; 1607 bfd_boolean is_pic; 1608 bfd_boolean to_reloc_32; 1609 unsigned int r_type; 1610 unsigned int r_symndx; 1611 bfd_vma roff = irel->r_offset; 1612 1613 if (roff < 2) 1614 return TRUE; 1615 1616 /* Addend for R_386_GOT32X relocations must be 0. */ 1617 addend = bfd_get_32 (abfd, contents + roff); 1618 if (addend != 0) 1619 return TRUE; 1620 1621 htab = elf_i386_hash_table (link_info); 1622 is_pic = bfd_link_pic (link_info); 1623 1624 r_type = ELF32_R_TYPE (irel->r_info); 1625 r_symndx = ELF32_R_SYM (irel->r_info); 1626 1627 modrm = bfd_get_8 (abfd, contents + roff - 1); 1628 baseless = (modrm & 0xc7) == 0x5; 1629 1630 if (baseless && is_pic) 1631 { 1632 /* For PIC, disallow R_386_GOT32X without a base register 1633 since we don't know what the GOT base is. */ 1634 const char *name; 1635 1636 if (h == NULL) 1637 { 1638 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, 1639 r_symndx); 1640 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); 1641 } 1642 else 1643 name = h->root.root.string; 1644 1645 (*_bfd_error_handler) 1646 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"), 1647 abfd, name); 1648 return FALSE; 1649 } 1650 1651 opcode = bfd_get_8 (abfd, contents + roff - 2); 1652 1653 /* Convert to R_386_32 if PIC is false or there is no base 1654 register. */ 1655 to_reloc_32 = !is_pic || baseless; 1656 1657 /* Try to convert R_386_GOT32X. Get the symbol referred to by the 1658 reloc. */ 1659 if (h == NULL) 1660 { 1661 if (opcode == 0x0ff) 1662 /* Convert "call/jmp *foo@GOT[(%reg)]". */ 1663 goto convert_branch; 1664 else 1665 /* Convert "mov foo@GOT[(%reg1)], %reg2", 1666 "test %reg1, foo@GOT(%reg2)" and 1667 "binop foo@GOT[(%reg1)], %reg2". */ 1668 goto convert_load; 1669 } 1670 1671 /* Undefined weak symbol is only bound locally in executable 1672 and its reference is resolved as 0. */ 1673 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, TRUE, 1674 elf_i386_hash_entry (h))) 1675 { 1676 if (opcode == 0xff) 1677 { 1678 /* No direct branch to 0 for PIC. */ 1679 if (is_pic) 1680 return TRUE; 1681 else 1682 goto convert_branch; 1683 } 1684 else 1685 { 1686 /* We can convert load of address 0 to R_386_32. */ 1687 to_reloc_32 = TRUE; 1688 goto convert_load; 1689 } 1690 } 1691 1692 if (opcode == 0xff) 1693 { 1694 /* We have "call/jmp *foo@GOT[(%reg)]". */ 1695 if ((h->root.type == bfd_link_hash_defined 1696 || h->root.type == bfd_link_hash_defweak) 1697 && SYMBOL_REFERENCES_LOCAL (link_info, h)) 1698 { 1699 /* The function is locally defined. */ 1700convert_branch: 1701 /* Convert R_386_GOT32X to R_386_PC32. */ 1702 if (modrm == 0x15 || (modrm & 0xf8) == 0x90) 1703 { 1704 struct elf_i386_link_hash_entry *eh 1705 = (struct elf_i386_link_hash_entry *) h; 1706 1707 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE 1708 is a nop prefix. */ 1709 modrm = 0xe8; 1710 /* To support TLS optimization, always use addr32 prefix 1711 for "call *___tls_get_addr@GOT(%reg)". */ 1712 if (eh && eh->tls_get_addr == 1) 1713 { 1714 nop = 0x67; 1715 nop_offset = irel->r_offset - 2; 1716 } 1717 else 1718 { 1719 nop = link_info->call_nop_byte; 1720 if (link_info->call_nop_as_suffix) 1721 { 1722 nop_offset = roff + 3; 1723 irel->r_offset -= 1; 1724 } 1725 else 1726 nop_offset = roff - 2; 1727 } 1728 } 1729 else 1730 { 1731 /* Convert to "jmp foo nop". */ 1732 modrm = 0xe9; 1733 nop = NOP_OPCODE; 1734 nop_offset = roff + 3; 1735 irel->r_offset -= 1; 1736 } 1737 1738 bfd_put_8 (abfd, nop, contents + nop_offset); 1739 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1); 1740 /* When converting to PC-relative relocation, we 1741 need to adjust addend by -4. */ 1742 bfd_put_32 (abfd, -4, contents + irel->r_offset); 1743 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32); 1744 1745 *converted = TRUE; 1746 } 1747 } 1748 else 1749 { 1750 /* We have "mov foo@GOT[(%re1g)], %reg2", 1751 "test %reg1, foo@GOT(%reg2)" and 1752 "binop foo@GOT[(%reg1)], %reg2". 1753 1754 Avoid optimizing _DYNAMIC since ld.so may use its 1755 link-time address. */ 1756 if (h == htab->elf.hdynamic) 1757 return TRUE; 1758 1759 /* def_regular is set by an assignment in a linker script in 1760 bfd_elf_record_link_assignment. */ 1761 if ((h->def_regular 1762 || h->root.type == bfd_link_hash_defined 1763 || h->root.type == bfd_link_hash_defweak) 1764 && SYMBOL_REFERENCES_LOCAL (link_info, h)) 1765 { 1766convert_load: 1767 if (opcode == 0x8b) 1768 { 1769 if (to_reloc_32) 1770 { 1771 /* Convert "mov foo@GOT[(%reg1)], %reg2" to 1772 "mov $foo, %reg2" with R_386_32. */ 1773 r_type = R_386_32; 1774 modrm = 0xc0 | (modrm & 0x38) >> 3; 1775 bfd_put_8 (abfd, modrm, contents + roff - 1); 1776 opcode = 0xc7; 1777 } 1778 else 1779 { 1780 /* Convert "mov foo@GOT(%reg1), %reg2" to 1781 "lea foo@GOTOFF(%reg1), %reg2". */ 1782 r_type = R_386_GOTOFF; 1783 opcode = 0x8d; 1784 } 1785 } 1786 else 1787 { 1788 /* Only R_386_32 is supported. */ 1789 if (!to_reloc_32) 1790 return TRUE; 1791 1792 if (opcode == 0x85) 1793 { 1794 /* Convert "test %reg1, foo@GOT(%reg2)" to 1795 "test $foo, %reg1". */ 1796 modrm = 0xc0 | (modrm & 0x38) >> 3; 1797 opcode = 0xf7; 1798 } 1799 else 1800 { 1801 /* Convert "binop foo@GOT(%reg1), %reg2" to 1802 "binop $foo, %reg2". */ 1803 modrm = (0xc0 1804 | (modrm & 0x38) >> 3 1805 | (opcode & 0x3c)); 1806 opcode = 0x81; 1807 } 1808 bfd_put_8 (abfd, modrm, contents + roff - 1); 1809 r_type = R_386_32; 1810 } 1811 1812 bfd_put_8 (abfd, opcode, contents + roff - 2); 1813 irel->r_info = ELF32_R_INFO (r_symndx, r_type); 1814 1815 *converted = TRUE; 1816 } 1817 } 1818 1819 return TRUE; 1820} 1821 1822/* Rename some of the generic section flags to better document how they 1823 are used here. */ 1824#define need_convert_load sec_flg0 1825#define check_relocs_failed sec_flg1 1826 1827/* Look through the relocs for a section during the first phase, and 1828 calculate needed space in the global offset table, procedure linkage 1829 table, and dynamic reloc sections. */ 1830 1831static bfd_boolean 1832elf_i386_check_relocs (bfd *abfd, 1833 struct bfd_link_info *info, 1834 asection *sec, 1835 const Elf_Internal_Rela *relocs) 1836{ 1837 struct elf_i386_link_hash_table *htab; 1838 Elf_Internal_Shdr *symtab_hdr; 1839 struct elf_link_hash_entry **sym_hashes; 1840 const Elf_Internal_Rela *rel; 1841 const Elf_Internal_Rela *rel_end; 1842 asection *sreloc; 1843 bfd_byte *contents; 1844 bfd_boolean use_plt_got; 1845 1846 if (bfd_link_relocatable (info)) 1847 return TRUE; 1848 1849 /* Don't do anything special with non-loaded, non-alloced sections. 1850 In particular, any relocs in such sections should not affect GOT 1851 and PLT reference counting (ie. we don't allow them to create GOT 1852 or PLT entries), there's no possibility or desire to optimize TLS 1853 relocs, and there's not much point in propagating relocs to shared 1854 libs that the dynamic linker won't relocate. */ 1855 if ((sec->flags & SEC_ALLOC) == 0) 1856 return TRUE; 1857 1858 BFD_ASSERT (is_i386_elf (abfd)); 1859 1860 htab = elf_i386_hash_table (info); 1861 if (htab == NULL) 1862 { 1863 sec->check_relocs_failed = 1; 1864 return FALSE; 1865 } 1866 1867 /* Get the section contents. */ 1868 if (elf_section_data (sec)->this_hdr.contents != NULL) 1869 contents = elf_section_data (sec)->this_hdr.contents; 1870 else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 1871 { 1872 sec->check_relocs_failed = 1; 1873 return FALSE; 1874 } 1875 1876 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks 1877 && (get_elf_i386_backend_data (abfd) 1878 == &elf_i386_arch_bed)); 1879 1880 symtab_hdr = &elf_symtab_hdr (abfd); 1881 sym_hashes = elf_sym_hashes (abfd); 1882 1883 sreloc = NULL; 1884 1885 rel_end = relocs + sec->reloc_count; 1886 for (rel = relocs; rel < rel_end; rel++) 1887 { 1888 unsigned int r_type; 1889 unsigned long r_symndx; 1890 struct elf_link_hash_entry *h; 1891 struct elf_i386_link_hash_entry *eh; 1892 Elf_Internal_Sym *isym; 1893 const char *name; 1894 bfd_boolean size_reloc; 1895 1896 r_symndx = ELF32_R_SYM (rel->r_info); 1897 r_type = ELF32_R_TYPE (rel->r_info); 1898 1899 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 1900 { 1901 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), 1902 abfd, 1903 r_symndx); 1904 goto error_return; 1905 } 1906 1907 if (r_symndx < symtab_hdr->sh_info) 1908 { 1909 /* A local symbol. */ 1910 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 1911 abfd, r_symndx); 1912 if (isym == NULL) 1913 goto error_return; 1914 1915 /* Check relocation against local STT_GNU_IFUNC symbol. */ 1916 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) 1917 { 1918 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE); 1919 if (h == NULL) 1920 goto error_return; 1921 1922 /* Fake a STT_GNU_IFUNC symbol. */ 1923 h->type = STT_GNU_IFUNC; 1924 h->def_regular = 1; 1925 h->ref_regular = 1; 1926 h->forced_local = 1; 1927 h->root.type = bfd_link_hash_defined; 1928 } 1929 else 1930 h = NULL; 1931 } 1932 else 1933 { 1934 isym = NULL; 1935 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1936 while (h->root.type == bfd_link_hash_indirect 1937 || h->root.type == bfd_link_hash_warning) 1938 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1939 } 1940 1941 eh = (struct elf_i386_link_hash_entry *) h; 1942 if (h != NULL) 1943 { 1944 switch (r_type) 1945 { 1946 default: 1947 break; 1948 1949 case R_386_GOTOFF: 1950 eh->gotoff_ref = 1; 1951 case R_386_32: 1952 case R_386_PC32: 1953 case R_386_PLT32: 1954 case R_386_GOT32: 1955 case R_386_GOT32X: 1956 if (htab->elf.dynobj == NULL) 1957 htab->elf.dynobj = abfd; 1958 /* Create the ifunc sections for static executables. */ 1959 if (h->type == STT_GNU_IFUNC 1960 && !_bfd_elf_create_ifunc_sections (htab->elf.dynobj, 1961 info)) 1962 goto error_return; 1963 break; 1964 } 1965 1966 /* It is referenced by a non-shared object. */ 1967 h->ref_regular = 1; 1968 h->root.non_ir_ref = 1; 1969 1970 if (h->type == STT_GNU_IFUNC) 1971 elf_tdata (info->output_bfd)->has_gnu_symbols 1972 |= elf_gnu_symbol_ifunc; 1973 } 1974 1975 if (! elf_i386_tls_transition (info, abfd, sec, contents, 1976 symtab_hdr, sym_hashes, 1977 &r_type, GOT_UNKNOWN, 1978 rel, rel_end, h, r_symndx, FALSE)) 1979 goto error_return; 1980 1981 switch (r_type) 1982 { 1983 case R_386_TLS_LDM: 1984 htab->tls_ldm_got.refcount += 1; 1985 goto create_got; 1986 1987 case R_386_PLT32: 1988 /* This symbol requires a procedure linkage table entry. We 1989 actually build the entry in adjust_dynamic_symbol, 1990 because this might be a case of linking PIC code which is 1991 never referenced by a dynamic object, in which case we 1992 don't need to generate a procedure linkage table entry 1993 after all. */ 1994 1995 /* If this is a local symbol, we resolve it directly without 1996 creating a procedure linkage table entry. */ 1997 if (h == NULL) 1998 continue; 1999 2000 eh->has_got_reloc = 1; 2001 h->needs_plt = 1; 2002 h->plt.refcount += 1; 2003 break; 2004 2005 case R_386_SIZE32: 2006 size_reloc = TRUE; 2007 goto do_size; 2008 2009 case R_386_TLS_IE_32: 2010 case R_386_TLS_IE: 2011 case R_386_TLS_GOTIE: 2012 if (!bfd_link_executable (info)) 2013 info->flags |= DF_STATIC_TLS; 2014 /* Fall through */ 2015 2016 case R_386_GOT32: 2017 case R_386_GOT32X: 2018 case R_386_TLS_GD: 2019 case R_386_TLS_GOTDESC: 2020 case R_386_TLS_DESC_CALL: 2021 /* This symbol requires a global offset table entry. */ 2022 { 2023 int tls_type, old_tls_type; 2024 2025 switch (r_type) 2026 { 2027 default: 2028 case R_386_GOT32: 2029 case R_386_GOT32X: 2030 tls_type = GOT_NORMAL; 2031 break; 2032 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; 2033 case R_386_TLS_GOTDESC: 2034 case R_386_TLS_DESC_CALL: 2035 tls_type = GOT_TLS_GDESC; break; 2036 case R_386_TLS_IE_32: 2037 if (ELF32_R_TYPE (rel->r_info) == r_type) 2038 tls_type = GOT_TLS_IE_NEG; 2039 else 2040 /* If this is a GD->IE transition, we may use either of 2041 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ 2042 tls_type = GOT_TLS_IE; 2043 break; 2044 case R_386_TLS_IE: 2045 case R_386_TLS_GOTIE: 2046 tls_type = GOT_TLS_IE_POS; break; 2047 } 2048 2049 if (h != NULL) 2050 { 2051 h->got.refcount += 1; 2052 old_tls_type = elf_i386_hash_entry(h)->tls_type; 2053 } 2054 else 2055 { 2056 bfd_signed_vma *local_got_refcounts; 2057 2058 /* This is a global offset table entry for a local symbol. */ 2059 local_got_refcounts = elf_local_got_refcounts (abfd); 2060 if (local_got_refcounts == NULL) 2061 { 2062 bfd_size_type size; 2063 2064 size = symtab_hdr->sh_info; 2065 size *= (sizeof (bfd_signed_vma) 2066 + sizeof (bfd_vma) + sizeof(char)); 2067 local_got_refcounts = (bfd_signed_vma *) 2068 bfd_zalloc (abfd, size); 2069 if (local_got_refcounts == NULL) 2070 goto error_return; 2071 elf_local_got_refcounts (abfd) = local_got_refcounts; 2072 elf_i386_local_tlsdesc_gotent (abfd) 2073 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); 2074 elf_i386_local_got_tls_type (abfd) 2075 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); 2076 } 2077 local_got_refcounts[r_symndx] += 1; 2078 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx]; 2079 } 2080 2081 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) 2082 tls_type |= old_tls_type; 2083 /* If a TLS symbol is accessed using IE at least once, 2084 there is no point to use dynamic model for it. */ 2085 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN 2086 && (! GOT_TLS_GD_ANY_P (old_tls_type) 2087 || (tls_type & GOT_TLS_IE) == 0)) 2088 { 2089 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type)) 2090 tls_type = old_tls_type; 2091 else if (GOT_TLS_GD_ANY_P (old_tls_type) 2092 && GOT_TLS_GD_ANY_P (tls_type)) 2093 tls_type |= old_tls_type; 2094 else 2095 { 2096 if (h) 2097 name = h->root.root.string; 2098 else 2099 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, 2100 NULL); 2101 (*_bfd_error_handler) 2102 (_("%B: `%s' accessed both as normal and " 2103 "thread local symbol"), 2104 abfd, name); 2105 bfd_set_error (bfd_error_bad_value); 2106 goto error_return; 2107 } 2108 } 2109 2110 if (old_tls_type != tls_type) 2111 { 2112 if (h != NULL) 2113 elf_i386_hash_entry (h)->tls_type = tls_type; 2114 else 2115 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type; 2116 } 2117 } 2118 /* Fall through */ 2119 2120 case R_386_GOTOFF: 2121 case R_386_GOTPC: 2122 create_got: 2123 if (htab->elf.sgot == NULL) 2124 { 2125 if (htab->elf.dynobj == NULL) 2126 htab->elf.dynobj = abfd; 2127 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info)) 2128 goto error_return; 2129 } 2130 if (r_type != R_386_TLS_IE) 2131 { 2132 if (eh != NULL) 2133 eh->has_got_reloc = 1; 2134 break; 2135 } 2136 /* Fall through */ 2137 2138 case R_386_TLS_LE_32: 2139 case R_386_TLS_LE: 2140 if (eh != NULL) 2141 eh->has_got_reloc = 1; 2142 if (bfd_link_executable (info)) 2143 break; 2144 info->flags |= DF_STATIC_TLS; 2145 goto do_relocation; 2146 2147 case R_386_32: 2148 case R_386_PC32: 2149 if (eh != NULL && (sec->flags & SEC_CODE) != 0) 2150 eh->has_non_got_reloc = 1; 2151do_relocation: 2152 /* We are called after all symbols have been resolved. Only 2153 relocation against STT_GNU_IFUNC symbol must go through 2154 PLT. */ 2155 if (h != NULL 2156 && (bfd_link_executable (info) 2157 || h->type == STT_GNU_IFUNC)) 2158 { 2159 /* If this reloc is in a read-only section, we might 2160 need a copy reloc. We can't check reliably at this 2161 stage whether the section is read-only, as input 2162 sections have not yet been mapped to output sections. 2163 Tentatively set the flag for now, and correct in 2164 adjust_dynamic_symbol. */ 2165 h->non_got_ref = 1; 2166 2167 /* We may need a .plt entry if the symbol is a function 2168 defined in a shared lib or is a STT_GNU_IFUNC function 2169 referenced from the code or read-only section. */ 2170 if (!h->def_regular 2171 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0) 2172 h->plt.refcount += 1; 2173 2174 if (r_type == R_386_PC32) 2175 { 2176 /* Since something like ".long foo - ." may be used 2177 as pointer, make sure that PLT is used if foo is 2178 a function defined in a shared library. */ 2179 if ((sec->flags & SEC_CODE) == 0) 2180 h->pointer_equality_needed = 1; 2181 } 2182 else 2183 { 2184 h->pointer_equality_needed = 1; 2185 /* R_386_32 can be resolved at run-time. */ 2186 if (r_type == R_386_32 2187 && (sec->flags & SEC_READONLY) == 0) 2188 eh->func_pointer_refcount += 1; 2189 } 2190 } 2191 2192 size_reloc = FALSE; 2193do_size: 2194 /* If we are creating a shared library, and this is a reloc 2195 against a global symbol, or a non PC relative reloc 2196 against a local symbol, then we need to copy the reloc 2197 into the shared library. However, if we are linking with 2198 -Bsymbolic, we do not need to copy a reloc against a 2199 global symbol which is defined in an object we are 2200 including in the link (i.e., DEF_REGULAR is set). At 2201 this point we have not seen all the input files, so it is 2202 possible that DEF_REGULAR is not set now but will be set 2203 later (it is never cleared). In case of a weak definition, 2204 DEF_REGULAR may be cleared later by a strong definition in 2205 a shared library. We account for that possibility below by 2206 storing information in the relocs_copied field of the hash 2207 table entry. A similar situation occurs when creating 2208 shared libraries and symbol visibility changes render the 2209 symbol local. 2210 2211 If on the other hand, we are creating an executable, we 2212 may need to keep relocations for symbols satisfied by a 2213 dynamic library if we manage to avoid copy relocs for the 2214 symbol. 2215 2216 Generate dynamic pointer relocation against STT_GNU_IFUNC 2217 symbol in the non-code section. */ 2218 if ((bfd_link_pic (info) 2219 && (r_type != R_386_PC32 2220 || (h != NULL 2221 && (! (bfd_link_pie (info) 2222 || SYMBOLIC_BIND (info, h)) 2223 || h->root.type == bfd_link_hash_defweak 2224 || !h->def_regular)))) 2225 || (h != NULL 2226 && h->type == STT_GNU_IFUNC 2227 && r_type == R_386_32 2228 && (sec->flags & SEC_CODE) == 0) 2229 || (ELIMINATE_COPY_RELOCS 2230 && !bfd_link_pic (info) 2231 && h != NULL 2232 && (h->root.type == bfd_link_hash_defweak 2233 || !h->def_regular))) 2234 { 2235 struct elf_dyn_relocs *p; 2236 struct elf_dyn_relocs **head; 2237 2238 /* We must copy these reloc types into the output file. 2239 Create a reloc section in dynobj and make room for 2240 this reloc. */ 2241 if (sreloc == NULL) 2242 { 2243 if (htab->elf.dynobj == NULL) 2244 htab->elf.dynobj = abfd; 2245 2246 sreloc = _bfd_elf_make_dynamic_reloc_section 2247 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE); 2248 2249 if (sreloc == NULL) 2250 goto error_return; 2251 } 2252 2253 /* If this is a global symbol, we count the number of 2254 relocations we need for this symbol. */ 2255 if (h != NULL) 2256 { 2257 head = &eh->dyn_relocs; 2258 } 2259 else 2260 { 2261 /* Track dynamic relocs needed for local syms too. 2262 We really need local syms available to do this 2263 easily. Oh well. */ 2264 void **vpp; 2265 asection *s; 2266 2267 isym = bfd_sym_from_r_symndx (&htab->sym_cache, 2268 abfd, r_symndx); 2269 if (isym == NULL) 2270 goto error_return; 2271 2272 s = bfd_section_from_elf_index (abfd, isym->st_shndx); 2273 if (s == NULL) 2274 s = sec; 2275 2276 vpp = &elf_section_data (s)->local_dynrel; 2277 head = (struct elf_dyn_relocs **)vpp; 2278 } 2279 2280 p = *head; 2281 if (p == NULL || p->sec != sec) 2282 { 2283 bfd_size_type amt = sizeof *p; 2284 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj, 2285 amt); 2286 if (p == NULL) 2287 goto error_return; 2288 p->next = *head; 2289 *head = p; 2290 p->sec = sec; 2291 p->count = 0; 2292 p->pc_count = 0; 2293 } 2294 2295 p->count += 1; 2296 /* Count size relocation as PC-relative relocation. */ 2297 if (r_type == R_386_PC32 || size_reloc) 2298 p->pc_count += 1; 2299 } 2300 break; 2301 2302 /* This relocation describes the C++ object vtable hierarchy. 2303 Reconstruct it for later use during GC. */ 2304 case R_386_GNU_VTINHERIT: 2305 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 2306 goto error_return; 2307 break; 2308 2309 /* This relocation describes which C++ vtable entries are actually 2310 used. Record for later use during GC. */ 2311 case R_386_GNU_VTENTRY: 2312 BFD_ASSERT (h != NULL); 2313 if (h != NULL 2314 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 2315 goto error_return; 2316 break; 2317 2318 default: 2319 break; 2320 } 2321 2322 if (use_plt_got 2323 && h != NULL 2324 && h->plt.refcount > 0 2325 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed) 2326 || h->got.refcount > 0) 2327 && htab->plt_got == NULL) 2328 { 2329 /* Create the GOT procedure linkage table. */ 2330 unsigned int plt_got_align; 2331 const struct elf_backend_data *bed; 2332 2333 bed = get_elf_backend_data (info->output_bfd); 2334 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8 2335 && (sizeof (elf_i386_got_plt_entry) 2336 == sizeof (elf_i386_pic_got_plt_entry))); 2337 plt_got_align = 3; 2338 2339 if (htab->elf.dynobj == NULL) 2340 htab->elf.dynobj = abfd; 2341 htab->plt_got 2342 = bfd_make_section_anyway_with_flags (htab->elf.dynobj, 2343 ".plt.got", 2344 (bed->dynamic_sec_flags 2345 | SEC_ALLOC 2346 | SEC_CODE 2347 | SEC_LOAD 2348 | SEC_READONLY)); 2349 if (htab->plt_got == NULL 2350 || !bfd_set_section_alignment (htab->elf.dynobj, 2351 htab->plt_got, 2352 plt_got_align)) 2353 goto error_return; 2354 } 2355 2356 if (r_type == R_386_GOT32X 2357 && (h == NULL || h->type != STT_GNU_IFUNC)) 2358 sec->need_convert_load = 1; 2359 } 2360 2361 if (elf_section_data (sec)->this_hdr.contents != contents) 2362 { 2363 if (!info->keep_memory) 2364 free (contents); 2365 else 2366 { 2367 /* Cache the section contents for elf_link_input_bfd. */ 2368 elf_section_data (sec)->this_hdr.contents = contents; 2369 } 2370 } 2371 2372 return TRUE; 2373 2374error_return: 2375 if (elf_section_data (sec)->this_hdr.contents != contents) 2376 free (contents); 2377 sec->check_relocs_failed = 1; 2378 return FALSE; 2379} 2380 2381/* Return the section that should be marked against GC for a given 2382 relocation. */ 2383 2384static asection * 2385elf_i386_gc_mark_hook (asection *sec, 2386 struct bfd_link_info *info, 2387 Elf_Internal_Rela *rel, 2388 struct elf_link_hash_entry *h, 2389 Elf_Internal_Sym *sym) 2390{ 2391 if (h != NULL) 2392 switch (ELF32_R_TYPE (rel->r_info)) 2393 { 2394 case R_386_GNU_VTINHERIT: 2395 case R_386_GNU_VTENTRY: 2396 return NULL; 2397 } 2398 2399 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 2400} 2401 2402/* Remove undefined weak symbol from the dynamic symbol table if it 2403 is resolved to 0. */ 2404 2405static bfd_boolean 2406elf_i386_fixup_symbol (struct bfd_link_info *info, 2407 struct elf_link_hash_entry *h) 2408{ 2409 if (h->dynindx != -1 2410 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, 2411 elf_i386_hash_entry (h)->has_got_reloc, 2412 elf_i386_hash_entry (h))) 2413 { 2414 h->dynindx = -1; 2415 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, 2416 h->dynstr_index); 2417 } 2418 return TRUE; 2419} 2420 2421/* Adjust a symbol defined by a dynamic object and referenced by a 2422 regular object. The current definition is in some section of the 2423 dynamic object, but we're not including those sections. We have to 2424 change the definition to something the rest of the link can 2425 understand. */ 2426 2427static bfd_boolean 2428elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info, 2429 struct elf_link_hash_entry *h) 2430{ 2431 struct elf_i386_link_hash_table *htab; 2432 asection *s; 2433 struct elf_i386_link_hash_entry *eh; 2434 struct elf_dyn_relocs *p; 2435 2436 /* STT_GNU_IFUNC symbol must go through PLT. */ 2437 if (h->type == STT_GNU_IFUNC) 2438 { 2439 /* All local STT_GNU_IFUNC references must be treate as local 2440 calls via local PLT. */ 2441 if (h->ref_regular 2442 && SYMBOL_CALLS_LOCAL (info, h)) 2443 { 2444 bfd_size_type pc_count = 0, count = 0; 2445 struct elf_dyn_relocs **pp; 2446 2447 eh = (struct elf_i386_link_hash_entry *) h; 2448 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 2449 { 2450 pc_count += p->pc_count; 2451 p->count -= p->pc_count; 2452 p->pc_count = 0; 2453 count += p->count; 2454 if (p->count == 0) 2455 *pp = p->next; 2456 else 2457 pp = &p->next; 2458 } 2459 2460 if (pc_count || count) 2461 { 2462 h->non_got_ref = 1; 2463 if (pc_count) 2464 { 2465 /* Increment PLT reference count only for PC-relative 2466 references. */ 2467 h->needs_plt = 1; 2468 if (h->plt.refcount <= 0) 2469 h->plt.refcount = 1; 2470 else 2471 h->plt.refcount += 1; 2472 } 2473 } 2474 } 2475 2476 if (h->plt.refcount <= 0) 2477 { 2478 h->plt.offset = (bfd_vma) -1; 2479 h->needs_plt = 0; 2480 } 2481 return TRUE; 2482 } 2483 2484 /* If this is a function, put it in the procedure linkage table. We 2485 will fill in the contents of the procedure linkage table later, 2486 when we know the address of the .got section. */ 2487 if (h->type == STT_FUNC 2488 || h->needs_plt) 2489 { 2490 if (h->plt.refcount <= 0 2491 || SYMBOL_CALLS_LOCAL (info, h) 2492 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 2493 && h->root.type == bfd_link_hash_undefweak)) 2494 { 2495 /* This case can occur if we saw a PLT32 reloc in an input 2496 file, but the symbol was never referred to by a dynamic 2497 object, or if all references were garbage collected. In 2498 such a case, we don't actually need to build a procedure 2499 linkage table, and we can just do a PC32 reloc instead. */ 2500 h->plt.offset = (bfd_vma) -1; 2501 h->needs_plt = 0; 2502 } 2503 2504 return TRUE; 2505 } 2506 else 2507 /* It's possible that we incorrectly decided a .plt reloc was 2508 needed for an R_386_PC32 reloc to a non-function sym in 2509 check_relocs. We can't decide accurately between function and 2510 non-function syms in check-relocs; Objects loaded later in 2511 the link may change h->type. So fix it now. */ 2512 h->plt.offset = (bfd_vma) -1; 2513 2514 /* If this is a weak symbol, and there is a real definition, the 2515 processor independent code will have arranged for us to see the 2516 real definition first, and we can just use the same value. */ 2517 if (h->u.weakdef != NULL) 2518 { 2519 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 2520 || h->u.weakdef->root.type == bfd_link_hash_defweak); 2521 h->root.u.def.section = h->u.weakdef->root.u.def.section; 2522 h->root.u.def.value = h->u.weakdef->root.u.def.value; 2523 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 2524 h->non_got_ref = h->u.weakdef->non_got_ref; 2525 return TRUE; 2526 } 2527 2528 /* This is a reference to a symbol defined by a dynamic object which 2529 is not a function. */ 2530 2531 /* If we are creating a shared library, we must presume that the 2532 only references to the symbol are via the global offset table. 2533 For such cases we need not do anything here; the relocations will 2534 be handled correctly by relocate_section. */ 2535 if (!bfd_link_executable (info)) 2536 return TRUE; 2537 2538 /* If there are no references to this symbol that do not use the 2539 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy 2540 reloc. */ 2541 eh = (struct elf_i386_link_hash_entry *) h; 2542 if (!h->non_got_ref && !eh->gotoff_ref) 2543 return TRUE; 2544 2545 /* If -z nocopyreloc was given, we won't generate them either. */ 2546 if (info->nocopyreloc) 2547 { 2548 h->non_got_ref = 0; 2549 return TRUE; 2550 } 2551 2552 htab = elf_i386_hash_table (info); 2553 if (htab == NULL) 2554 return FALSE; 2555 2556 /* If there aren't any dynamic relocs in read-only sections nor 2557 R_386_GOTOFF relocation, then we can keep the dynamic relocs and 2558 avoid the copy reloc. This doesn't work on VxWorks, where we can 2559 not have dynamic relocations (other than copy and jump slot 2560 relocations) in an executable. */ 2561 if (ELIMINATE_COPY_RELOCS 2562 && !eh->gotoff_ref 2563 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks) 2564 { 2565 for (p = eh->dyn_relocs; p != NULL; p = p->next) 2566 { 2567 s = p->sec->output_section; 2568 if (s != NULL && (s->flags & SEC_READONLY) != 0) 2569 break; 2570 } 2571 2572 if (p == NULL) 2573 { 2574 h->non_got_ref = 0; 2575 return TRUE; 2576 } 2577 } 2578 2579 /* We must allocate the symbol in our .dynbss section, which will 2580 become part of the .bss section of the executable. There will be 2581 an entry for this symbol in the .dynsym section. The dynamic 2582 object will contain position independent code, so all references 2583 from the dynamic object to this symbol will go through the global 2584 offset table. The dynamic linker will use the .dynsym entry to 2585 determine the address it must put in the global offset table, so 2586 both the dynamic object and the regular object will refer to the 2587 same memory location for the variable. */ 2588 2589 /* We must generate a R_386_COPY reloc to tell the dynamic linker to 2590 copy the initial value out of the dynamic object and into the 2591 runtime process image. */ 2592 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) 2593 { 2594 htab->srelbss->size += sizeof (Elf32_External_Rel); 2595 h->needs_copy = 1; 2596 } 2597 2598 s = htab->sdynbss; 2599 2600 return _bfd_elf_adjust_dynamic_copy (info, h, s); 2601} 2602 2603/* Allocate space in .plt, .got and associated reloc sections for 2604 dynamic relocs. */ 2605 2606static bfd_boolean 2607elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) 2608{ 2609 struct bfd_link_info *info; 2610 struct elf_i386_link_hash_table *htab; 2611 struct elf_i386_link_hash_entry *eh; 2612 struct elf_dyn_relocs *p; 2613 unsigned plt_entry_size; 2614 bfd_boolean resolved_to_zero; 2615 2616 if (h->root.type == bfd_link_hash_indirect) 2617 return TRUE; 2618 2619 eh = (struct elf_i386_link_hash_entry *) h; 2620 2621 info = (struct bfd_link_info *) inf; 2622 htab = elf_i386_hash_table (info); 2623 if (htab == NULL) 2624 return FALSE; 2625 2626 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd); 2627 2628 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, 2629 eh->has_got_reloc, 2630 eh); 2631 2632 /* Clear the reference count of function pointer relocations if 2633 symbol isn't a normal function. */ 2634 if (h->type != STT_FUNC) 2635 eh->func_pointer_refcount = 0; 2636 2637 /* We can't use the GOT PLT if pointer equality is needed since 2638 finish_dynamic_symbol won't clear symbol value and the dynamic 2639 linker won't update the GOT slot. We will get into an infinite 2640 loop at run-time. */ 2641 if (htab->plt_got != NULL 2642 && h->type != STT_GNU_IFUNC 2643 && !h->pointer_equality_needed 2644 && h->plt.refcount > 0 2645 && h->got.refcount > 0) 2646 { 2647 /* Don't use the regular PLT if there are both GOT and GOTPLT 2648 reloctions. */ 2649 h->plt.offset = (bfd_vma) -1; 2650 2651 /* Use the GOT PLT. */ 2652 eh->plt_got.refcount = 1; 2653 } 2654 2655 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it 2656 here if it is defined and referenced in a non-shared object. */ 2657 if (h->type == STT_GNU_IFUNC 2658 && h->def_regular) 2659 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs, 2660 &htab->readonly_dynrelocs_against_ifunc, 2661 plt_entry_size, 2662 plt_entry_size, 4, TRUE); 2663 /* Don't create the PLT entry if there are only function pointer 2664 relocations which can be resolved at run-time. */ 2665 else if (htab->elf.dynamic_sections_created 2666 && (h->plt.refcount > eh->func_pointer_refcount 2667 || eh->plt_got.refcount > 0)) 2668 { 2669 bfd_boolean use_plt_got; 2670 2671 /* Clear the reference count of function pointer relocations 2672 if PLT is used. */ 2673 eh->func_pointer_refcount = 0; 2674 2675 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed) 2676 { 2677 /* Don't use the regular PLT for DF_BIND_NOW. */ 2678 h->plt.offset = (bfd_vma) -1; 2679 2680 /* Use the GOT PLT. */ 2681 h->got.refcount = 1; 2682 eh->plt_got.refcount = 1; 2683 } 2684 2685 use_plt_got = eh->plt_got.refcount > 0; 2686 2687 /* Make sure this symbol is output as a dynamic symbol. 2688 Undefined weak syms won't yet be marked as dynamic. */ 2689 if (h->dynindx == -1 2690 && !h->forced_local 2691 && !resolved_to_zero) 2692 { 2693 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2694 return FALSE; 2695 } 2696 2697 if (bfd_link_pic (info) 2698 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 2699 { 2700 asection *s = htab->elf.splt; 2701 asection *got_s = htab->plt_got; 2702 2703 /* If this is the first .plt entry, make room for the special 2704 first entry. The .plt section is used by prelink to undo 2705 prelinking for dynamic relocations. */ 2706 if (s->size == 0) 2707 s->size = plt_entry_size; 2708 2709 if (use_plt_got) 2710 eh->plt_got.offset = got_s->size; 2711 else 2712 h->plt.offset = s->size; 2713 2714 /* If this symbol is not defined in a regular file, and we are 2715 not generating a shared library, then set the symbol to this 2716 location in the .plt. This is required to make function 2717 pointers compare as equal between the normal executable and 2718 the shared library. */ 2719 if (! bfd_link_pic (info) 2720 && !h->def_regular) 2721 { 2722 if (use_plt_got) 2723 { 2724 /* We need to make a call to the entry of the GOT PLT 2725 instead of regular PLT entry. */ 2726 h->root.u.def.section = got_s; 2727 h->root.u.def.value = eh->plt_got.offset; 2728 } 2729 else 2730 { 2731 h->root.u.def.section = s; 2732 h->root.u.def.value = h->plt.offset; 2733 } 2734 } 2735 2736 /* Make room for this entry. */ 2737 if (use_plt_got) 2738 got_s->size += sizeof (elf_i386_got_plt_entry); 2739 else 2740 { 2741 s->size += plt_entry_size; 2742 2743 /* We also need to make an entry in the .got.plt section, 2744 which will be placed in the .got section by the linker 2745 script. */ 2746 htab->elf.sgotplt->size += 4; 2747 2748 /* There should be no PLT relocation against resolved 2749 undefined weak symbol in executable. */ 2750 if (!resolved_to_zero) 2751 { 2752 /* We also need to make an entry in the .rel.plt 2753 section. */ 2754 htab->elf.srelplt->size += sizeof (Elf32_External_Rel); 2755 htab->elf.srelplt->reloc_count++; 2756 } 2757 } 2758 2759 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks 2760 && !bfd_link_pic (info)) 2761 { 2762 /* VxWorks has a second set of relocations for each PLT entry 2763 in executables. They go in a separate relocation section, 2764 which is processed by the kernel loader. */ 2765 2766 /* There are two relocations for the initial PLT entry: an 2767 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an 2768 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ 2769 2770 if (h->plt.offset == plt_entry_size) 2771 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); 2772 2773 /* There are two extra relocations for each subsequent PLT entry: 2774 an R_386_32 relocation for the GOT entry, and an R_386_32 2775 relocation for the PLT entry. */ 2776 2777 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); 2778 } 2779 } 2780 else 2781 { 2782 eh->plt_got.offset = (bfd_vma) -1; 2783 h->plt.offset = (bfd_vma) -1; 2784 h->needs_plt = 0; 2785 } 2786 } 2787 else 2788 { 2789 eh->plt_got.offset = (bfd_vma) -1; 2790 h->plt.offset = (bfd_vma) -1; 2791 h->needs_plt = 0; 2792 } 2793 2794 eh->tlsdesc_got = (bfd_vma) -1; 2795 2796 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary, 2797 make it a R_386_TLS_LE_32 requiring no TLS entry. */ 2798 if (h->got.refcount > 0 2799 && bfd_link_executable (info) 2800 && h->dynindx == -1 2801 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE)) 2802 h->got.offset = (bfd_vma) -1; 2803 else if (h->got.refcount > 0) 2804 { 2805 asection *s; 2806 bfd_boolean dyn; 2807 int tls_type = elf_i386_hash_entry(h)->tls_type; 2808 2809 /* Make sure this symbol is output as a dynamic symbol. 2810 Undefined weak syms won't yet be marked as dynamic. */ 2811 if (h->dynindx == -1 2812 && !h->forced_local 2813 && !resolved_to_zero) 2814 { 2815 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2816 return FALSE; 2817 } 2818 2819 s = htab->elf.sgot; 2820 if (GOT_TLS_GDESC_P (tls_type)) 2821 { 2822 eh->tlsdesc_got = htab->elf.sgotplt->size 2823 - elf_i386_compute_jump_table_size (htab); 2824 htab->elf.sgotplt->size += 8; 2825 h->got.offset = (bfd_vma) -2; 2826 } 2827 if (! GOT_TLS_GDESC_P (tls_type) 2828 || GOT_TLS_GD_P (tls_type)) 2829 { 2830 h->got.offset = s->size; 2831 s->size += 4; 2832 /* R_386_TLS_GD needs 2 consecutive GOT slots. */ 2833 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH) 2834 s->size += 4; 2835 } 2836 dyn = htab->elf.dynamic_sections_created; 2837 /* R_386_TLS_IE_32 needs one dynamic relocation, 2838 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, 2839 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we 2840 need two), R_386_TLS_GD needs one if local symbol and two if 2841 global. No dynamic relocation against resolved undefined weak 2842 symbol in executable. */ 2843 if (tls_type == GOT_TLS_IE_BOTH) 2844 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel); 2845 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) 2846 || (tls_type & GOT_TLS_IE)) 2847 htab->elf.srelgot->size += sizeof (Elf32_External_Rel); 2848 else if (GOT_TLS_GD_P (tls_type)) 2849 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel); 2850 else if (! GOT_TLS_GDESC_P (tls_type) 2851 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2852 && !resolved_to_zero) 2853 || h->root.type != bfd_link_hash_undefweak) 2854 && (bfd_link_pic (info) 2855 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 2856 htab->elf.srelgot->size += sizeof (Elf32_External_Rel); 2857 if (GOT_TLS_GDESC_P (tls_type)) 2858 htab->elf.srelplt->size += sizeof (Elf32_External_Rel); 2859 } 2860 else 2861 h->got.offset = (bfd_vma) -1; 2862 2863 if (eh->dyn_relocs == NULL) 2864 return TRUE; 2865 2866 /* In the shared -Bsymbolic case, discard space allocated for 2867 dynamic pc-relative relocs against symbols which turn out to be 2868 defined in regular objects. For the normal shared case, discard 2869 space for pc-relative relocs that have become local due to symbol 2870 visibility changes. */ 2871 2872 if (bfd_link_pic (info)) 2873 { 2874 /* The only reloc that uses pc_count is R_386_PC32, which will 2875 appear on a call or on something like ".long foo - .". We 2876 want calls to protected symbols to resolve directly to the 2877 function rather than going via the plt. If people want 2878 function pointer comparisons to work as expected then they 2879 should avoid writing assembly like ".long foo - .". */ 2880 if (SYMBOL_CALLS_LOCAL (info, h)) 2881 { 2882 struct elf_dyn_relocs **pp; 2883 2884 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 2885 { 2886 p->count -= p->pc_count; 2887 p->pc_count = 0; 2888 if (p->count == 0) 2889 *pp = p->next; 2890 else 2891 pp = &p->next; 2892 } 2893 } 2894 2895 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks) 2896 { 2897 struct elf_dyn_relocs **pp; 2898 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 2899 { 2900 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0) 2901 *pp = p->next; 2902 else 2903 pp = &p->next; 2904 } 2905 } 2906 2907 /* Also discard relocs on undefined weak syms with non-default 2908 visibility or in PIE. */ 2909 if (eh->dyn_relocs != NULL 2910 && h->root.type == bfd_link_hash_undefweak) 2911 { 2912 /* Undefined weak symbol is never bound locally in shared 2913 library. */ 2914 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 2915 || resolved_to_zero) 2916 { 2917 if (h->non_got_ref) 2918 { 2919 /* Keep dynamic non-GOT/non-PLT relocation so that we 2920 can branch to 0 without PLT. */ 2921 struct elf_dyn_relocs **pp; 2922 2923 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 2924 if (p->pc_count == 0) 2925 *pp = p->next; 2926 else 2927 { 2928 /* Remove non-R_386_PC32 relocation. */ 2929 p->count = p->pc_count; 2930 pp = &p->next; 2931 } 2932 2933 if (eh->dyn_relocs != NULL) 2934 { 2935 /* Make sure undefined weak symbols are output 2936 as dynamic symbols in PIEs for dynamic non-GOT 2937 non-PLT reloations. */ 2938 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2939 return FALSE; 2940 } 2941 } 2942 else 2943 eh->dyn_relocs = NULL; 2944 } 2945 else if (h->dynindx == -1 2946 && !h->forced_local) 2947 { 2948 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2949 return FALSE; 2950 } 2951 } 2952 } 2953 else if (ELIMINATE_COPY_RELOCS) 2954 { 2955 /* For the non-shared case, discard space for relocs against 2956 symbols which turn out to need copy relocs or are not 2957 dynamic. Keep dynamic relocations for run-time function 2958 pointer initialization. */ 2959 2960 if ((!h->non_got_ref 2961 || eh->func_pointer_refcount > 0 2962 || (h->root.type == bfd_link_hash_undefweak 2963 && !resolved_to_zero)) 2964 && ((h->def_dynamic 2965 && !h->def_regular) 2966 || (htab->elf.dynamic_sections_created 2967 && (h->root.type == bfd_link_hash_undefweak 2968 || h->root.type == bfd_link_hash_undefined)))) 2969 { 2970 /* Make sure this symbol is output as a dynamic symbol. 2971 Undefined weak syms won't yet be marked as dynamic. */ 2972 if (h->dynindx == -1 2973 && !h->forced_local 2974 && !resolved_to_zero) 2975 { 2976 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 2977 return FALSE; 2978 } 2979 2980 /* If that succeeded, we know we'll be keeping all the 2981 relocs. */ 2982 if (h->dynindx != -1) 2983 goto keep; 2984 } 2985 2986 eh->dyn_relocs = NULL; 2987 eh->func_pointer_refcount = 0; 2988 2989 keep: ; 2990 } 2991 2992 /* Finally, allocate space. */ 2993 for (p = eh->dyn_relocs; p != NULL; p = p->next) 2994 { 2995 asection *sreloc; 2996 2997 sreloc = elf_section_data (p->sec)->sreloc; 2998 2999 BFD_ASSERT (sreloc != NULL); 3000 sreloc->size += p->count * sizeof (Elf32_External_Rel); 3001 } 3002 3003 return TRUE; 3004} 3005 3006/* Allocate space in .plt, .got and associated reloc sections for 3007 local dynamic relocs. */ 3008 3009static bfd_boolean 3010elf_i386_allocate_local_dynrelocs (void **slot, void *inf) 3011{ 3012 struct elf_link_hash_entry *h 3013 = (struct elf_link_hash_entry *) *slot; 3014 3015 if (h->type != STT_GNU_IFUNC 3016 || !h->def_regular 3017 || !h->ref_regular 3018 || !h->forced_local 3019 || h->root.type != bfd_link_hash_defined) 3020 abort (); 3021 3022 return elf_i386_allocate_dynrelocs (h, inf); 3023} 3024 3025/* Find any dynamic relocs that apply to read-only sections. */ 3026 3027static bfd_boolean 3028elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) 3029{ 3030 struct elf_i386_link_hash_entry *eh; 3031 struct elf_dyn_relocs *p; 3032 3033 /* Skip local IFUNC symbols. */ 3034 if (h->forced_local && h->type == STT_GNU_IFUNC) 3035 return TRUE; 3036 3037 eh = (struct elf_i386_link_hash_entry *) h; 3038 for (p = eh->dyn_relocs; p != NULL; p = p->next) 3039 { 3040 asection *s = p->sec->output_section; 3041 3042 if (s != NULL && (s->flags & SEC_READONLY) != 0) 3043 { 3044 struct bfd_link_info *info = (struct bfd_link_info *) inf; 3045 3046 info->flags |= DF_TEXTREL; 3047 3048 if ((info->warn_shared_textrel && bfd_link_pic (info)) 3049 || info->error_textrel) 3050 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"), 3051 p->sec->owner, h->root.root.string, 3052 p->sec); 3053 3054 /* Not an error, just cut short the traversal. */ 3055 return FALSE; 3056 } 3057 } 3058 return TRUE; 3059} 3060 3061/* Convert load via the GOT slot to load immediate. */ 3062 3063static bfd_boolean 3064elf_i386_convert_load (bfd *abfd, asection *sec, 3065 struct bfd_link_info *link_info) 3066{ 3067 struct elf_i386_link_hash_table *htab; 3068 Elf_Internal_Shdr *symtab_hdr; 3069 Elf_Internal_Rela *internal_relocs; 3070 Elf_Internal_Rela *irel, *irelend; 3071 bfd_byte *contents; 3072 bfd_boolean changed; 3073 bfd_signed_vma *local_got_refcounts; 3074 3075 /* Don't even try to convert non-ELF outputs. */ 3076 if (!is_elf_hash_table (link_info->hash)) 3077 return FALSE; 3078 3079 /* Nothing to do if there is no need or no output. */ 3080 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC) 3081 || sec->need_convert_load == 0 3082 || bfd_is_abs_section (sec->output_section)) 3083 return TRUE; 3084 3085 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 3086 3087 /* Load the relocations for this section. */ 3088 internal_relocs = (_bfd_elf_link_read_relocs 3089 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL, 3090 link_info->keep_memory)); 3091 if (internal_relocs == NULL) 3092 return FALSE; 3093 3094 changed = FALSE; 3095 htab = elf_i386_hash_table (link_info); 3096 local_got_refcounts = elf_local_got_refcounts (abfd); 3097 3098 /* Get the section contents. */ 3099 if (elf_section_data (sec)->this_hdr.contents != NULL) 3100 contents = elf_section_data (sec)->this_hdr.contents; 3101 else 3102 { 3103 if (!bfd_malloc_and_get_section (abfd, sec, &contents)) 3104 goto error_return; 3105 } 3106 3107 irelend = internal_relocs + sec->reloc_count; 3108 for (irel = internal_relocs; irel < irelend; irel++) 3109 { 3110 unsigned int r_type = ELF32_R_TYPE (irel->r_info); 3111 unsigned int r_symndx; 3112 struct elf_link_hash_entry *h; 3113 bfd_boolean converted; 3114 3115 /* Don't convert R_386_GOT32 since we can't tell if it is applied 3116 to "mov $foo@GOT, %reg" which isn't a load via GOT. */ 3117 if (r_type != R_386_GOT32X) 3118 continue; 3119 3120 r_symndx = ELF32_R_SYM (irel->r_info); 3121 if (r_symndx < symtab_hdr->sh_info) 3122 h = elf_i386_get_local_sym_hash (htab, sec->owner, 3123 (const Elf_Internal_Rela *) irel, 3124 FALSE); 3125 else 3126 { 3127 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info]; 3128 while (h->root.type == bfd_link_hash_indirect 3129 || h->root.type == bfd_link_hash_warning) 3130 h = (struct elf_link_hash_entry *) h->root.u.i.link; 3131 } 3132 3133 /* STT_GNU_IFUNC must keep GOT32 relocations. */ 3134 if (h != NULL && h->type == STT_GNU_IFUNC) 3135 continue; 3136 3137 converted = FALSE; 3138 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents, 3139 irel, h, &converted, link_info)) 3140 goto error_return; 3141 3142 if (converted) 3143 { 3144 changed = converted; 3145 if (h) 3146 { 3147 if (h->got.refcount > 0) 3148 h->got.refcount -= 1; 3149 } 3150 else 3151 { 3152 if (local_got_refcounts != NULL 3153 && local_got_refcounts[r_symndx] > 0) 3154 local_got_refcounts[r_symndx] -= 1; 3155 } 3156 } 3157 } 3158 3159 if (contents != NULL 3160 && elf_section_data (sec)->this_hdr.contents != contents) 3161 { 3162 if (!changed && !link_info->keep_memory) 3163 free (contents); 3164 else 3165 { 3166 /* Cache the section contents for elf_link_input_bfd. */ 3167 elf_section_data (sec)->this_hdr.contents = contents; 3168 } 3169 } 3170 3171 if (elf_section_data (sec)->relocs != internal_relocs) 3172 { 3173 if (!changed) 3174 free (internal_relocs); 3175 else 3176 elf_section_data (sec)->relocs = internal_relocs; 3177 } 3178 3179 return TRUE; 3180 3181 error_return: 3182 if (contents != NULL 3183 && elf_section_data (sec)->this_hdr.contents != contents) 3184 free (contents); 3185 if (internal_relocs != NULL 3186 && elf_section_data (sec)->relocs != internal_relocs) 3187 free (internal_relocs); 3188 return FALSE; 3189} 3190 3191/* Set the sizes of the dynamic sections. */ 3192 3193static bfd_boolean 3194elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) 3195{ 3196 struct elf_i386_link_hash_table *htab; 3197 bfd *dynobj; 3198 asection *s; 3199 bfd_boolean relocs; 3200 bfd *ibfd; 3201 3202 htab = elf_i386_hash_table (info); 3203 if (htab == NULL) 3204 return FALSE; 3205 dynobj = htab->elf.dynobj; 3206 if (dynobj == NULL) 3207 abort (); 3208 3209 /* Set up .got offsets for local syms, and space for local dynamic 3210 relocs. */ 3211 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next) 3212 { 3213 bfd_signed_vma *local_got; 3214 bfd_signed_vma *end_local_got; 3215 char *local_tls_type; 3216 bfd_vma *local_tlsdesc_gotent; 3217 bfd_size_type locsymcount; 3218 Elf_Internal_Shdr *symtab_hdr; 3219 asection *srel; 3220 3221 if (! is_i386_elf (ibfd)) 3222 continue; 3223 3224 for (s = ibfd->sections; s != NULL; s = s->next) 3225 { 3226 struct elf_dyn_relocs *p; 3227 3228 if (!elf_i386_convert_load (ibfd, s, info)) 3229 return FALSE; 3230 3231 for (p = ((struct elf_dyn_relocs *) 3232 elf_section_data (s)->local_dynrel); 3233 p != NULL; 3234 p = p->next) 3235 { 3236 if (!bfd_is_abs_section (p->sec) 3237 && bfd_is_abs_section (p->sec->output_section)) 3238 { 3239 /* Input section has been discarded, either because 3240 it is a copy of a linkonce section or due to 3241 linker script /DISCARD/, so we'll be discarding 3242 the relocs too. */ 3243 } 3244 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks 3245 && strcmp (p->sec->output_section->name, 3246 ".tls_vars") == 0) 3247 { 3248 /* Relocations in vxworks .tls_vars sections are 3249 handled specially by the loader. */ 3250 } 3251 else if (p->count != 0) 3252 { 3253 srel = elf_section_data (p->sec)->sreloc; 3254 srel->size += p->count * sizeof (Elf32_External_Rel); 3255 if ((p->sec->output_section->flags & SEC_READONLY) != 0 3256 && (info->flags & DF_TEXTREL) == 0) 3257 { 3258 info->flags |= DF_TEXTREL; 3259 if ((info->warn_shared_textrel && bfd_link_pic (info)) 3260 || info->error_textrel) 3261 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"), 3262 p->sec->owner, p->sec); 3263 } 3264 } 3265 } 3266 } 3267 3268 local_got = elf_local_got_refcounts (ibfd); 3269 if (!local_got) 3270 continue; 3271 3272 symtab_hdr = &elf_symtab_hdr (ibfd); 3273 locsymcount = symtab_hdr->sh_info; 3274 end_local_got = local_got + locsymcount; 3275 local_tls_type = elf_i386_local_got_tls_type (ibfd); 3276 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd); 3277 s = htab->elf.sgot; 3278 srel = htab->elf.srelgot; 3279 for (; local_got < end_local_got; 3280 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) 3281 { 3282 *local_tlsdesc_gotent = (bfd_vma) -1; 3283 if (*local_got > 0) 3284 { 3285 if (GOT_TLS_GDESC_P (*local_tls_type)) 3286 { 3287 *local_tlsdesc_gotent = htab->elf.sgotplt->size 3288 - elf_i386_compute_jump_table_size (htab); 3289 htab->elf.sgotplt->size += 8; 3290 *local_got = (bfd_vma) -2; 3291 } 3292 if (! GOT_TLS_GDESC_P (*local_tls_type) 3293 || GOT_TLS_GD_P (*local_tls_type)) 3294 { 3295 *local_got = s->size; 3296 s->size += 4; 3297 if (GOT_TLS_GD_P (*local_tls_type) 3298 || *local_tls_type == GOT_TLS_IE_BOTH) 3299 s->size += 4; 3300 } 3301 if (bfd_link_pic (info) 3302 || GOT_TLS_GD_ANY_P (*local_tls_type) 3303 || (*local_tls_type & GOT_TLS_IE)) 3304 { 3305 if (*local_tls_type == GOT_TLS_IE_BOTH) 3306 srel->size += 2 * sizeof (Elf32_External_Rel); 3307 else if (GOT_TLS_GD_P (*local_tls_type) 3308 || ! GOT_TLS_GDESC_P (*local_tls_type)) 3309 srel->size += sizeof (Elf32_External_Rel); 3310 if (GOT_TLS_GDESC_P (*local_tls_type)) 3311 htab->elf.srelplt->size += sizeof (Elf32_External_Rel); 3312 } 3313 } 3314 else 3315 *local_got = (bfd_vma) -1; 3316 } 3317 } 3318 3319 if (htab->tls_ldm_got.refcount > 0) 3320 { 3321 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM 3322 relocs. */ 3323 htab->tls_ldm_got.offset = htab->elf.sgot->size; 3324 htab->elf.sgot->size += 8; 3325 htab->elf.srelgot->size += sizeof (Elf32_External_Rel); 3326 } 3327 else 3328 htab->tls_ldm_got.offset = -1; 3329 3330 /* Allocate global sym .plt and .got entries, and space for global 3331 sym dynamic relocs. */ 3332 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info); 3333 3334 /* Allocate .plt and .got entries, and space for local symbols. */ 3335 htab_traverse (htab->loc_hash_table, 3336 elf_i386_allocate_local_dynrelocs, 3337 info); 3338 3339 /* For every jump slot reserved in the sgotplt, reloc_count is 3340 incremented. However, when we reserve space for TLS descriptors, 3341 it's not incremented, so in order to compute the space reserved 3342 for them, it suffices to multiply the reloc count by the jump 3343 slot size. 3344 3345 PR ld/13302: We start next_irelative_index at the end of .rela.plt 3346 so that R_386_IRELATIVE entries come last. */ 3347 if (htab->elf.srelplt) 3348 { 3349 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count; 3350 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4; 3351 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1; 3352 } 3353 else if (htab->elf.irelplt) 3354 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1; 3355 3356 3357 if (htab->elf.sgotplt) 3358 { 3359 /* Don't allocate .got.plt section if there are no GOT nor PLT 3360 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */ 3361 if ((htab->elf.hgot == NULL 3362 || !htab->elf.hgot->ref_regular_nonweak) 3363 && (htab->elf.sgotplt->size 3364 == get_elf_backend_data (output_bfd)->got_header_size) 3365 && (htab->elf.splt == NULL 3366 || htab->elf.splt->size == 0) 3367 && (htab->elf.sgot == NULL 3368 || htab->elf.sgot->size == 0) 3369 && (htab->elf.iplt == NULL 3370 || htab->elf.iplt->size == 0) 3371 && (htab->elf.igotplt == NULL 3372 || htab->elf.igotplt->size == 0)) 3373 htab->elf.sgotplt->size = 0; 3374 } 3375 3376 3377 if (htab->plt_eh_frame != NULL 3378 && htab->elf.splt != NULL 3379 && htab->elf.splt->size != 0 3380 && !bfd_is_abs_section (htab->elf.splt->output_section) 3381 && _bfd_elf_eh_frame_present (info)) 3382 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt); 3383 3384 /* We now have determined the sizes of the various dynamic sections. 3385 Allocate memory for them. */ 3386 relocs = FALSE; 3387 for (s = dynobj->sections; s != NULL; s = s->next) 3388 { 3389 bfd_boolean strip_section = TRUE; 3390 3391 if ((s->flags & SEC_LINKER_CREATED) == 0) 3392 continue; 3393 3394 if (s == htab->elf.splt 3395 || s == htab->elf.sgot) 3396 { 3397 /* Strip this section if we don't need it; see the 3398 comment below. */ 3399 /* We'd like to strip these sections if they aren't needed, but if 3400 we've exported dynamic symbols from them we must leave them. 3401 It's too late to tell BFD to get rid of the symbols. */ 3402 3403 if (htab->elf.hplt != NULL) 3404 strip_section = FALSE; 3405 } 3406 else if (s == htab->elf.sgotplt 3407 || s == htab->elf.iplt 3408 || s == htab->elf.igotplt 3409 || s == htab->plt_got 3410 || s == htab->plt_eh_frame 3411 || s == htab->sdynbss) 3412 { 3413 /* Strip these too. */ 3414 } 3415 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel")) 3416 { 3417 if (s->size != 0 3418 && s != htab->elf.srelplt 3419 && s != htab->srelplt2) 3420 relocs = TRUE; 3421 3422 /* We use the reloc_count field as a counter if we need 3423 to copy relocs into the output file. */ 3424 s->reloc_count = 0; 3425 } 3426 else 3427 { 3428 /* It's not one of our sections, so don't allocate space. */ 3429 continue; 3430 } 3431 3432 if (s->size == 0) 3433 { 3434 /* If we don't need this section, strip it from the 3435 output file. This is mostly to handle .rel.bss and 3436 .rel.plt. We must create both sections in 3437 create_dynamic_sections, because they must be created 3438 before the linker maps input sections to output 3439 sections. The linker does that before 3440 adjust_dynamic_symbol is called, and it is that 3441 function which decides whether anything needs to go 3442 into these sections. */ 3443 if (strip_section) 3444 s->flags |= SEC_EXCLUDE; 3445 continue; 3446 } 3447 3448 if ((s->flags & SEC_HAS_CONTENTS) == 0) 3449 continue; 3450 3451 /* Allocate memory for the section contents. We use bfd_zalloc 3452 here in case unused entries are not reclaimed before the 3453 section's contents are written out. This should not happen, 3454 but this way if it does, we get a R_386_NONE reloc instead 3455 of garbage. */ 3456 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size); 3457 if (s->contents == NULL) 3458 return FALSE; 3459 } 3460 3461 if (htab->plt_eh_frame != NULL 3462 && htab->plt_eh_frame->contents != NULL) 3463 { 3464 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt, 3465 sizeof (elf_i386_eh_frame_plt)); 3466 bfd_put_32 (dynobj, htab->elf.splt->size, 3467 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET); 3468 } 3469 3470 if (htab->elf.dynamic_sections_created) 3471 { 3472 /* Add some entries to the .dynamic section. We fill in the 3473 values later, in elf_i386_finish_dynamic_sections, but we 3474 must add the entries now so that we get the correct size for 3475 the .dynamic section. The DT_DEBUG entry is filled in by the 3476 dynamic linker and used by the debugger. */ 3477#define add_dynamic_entry(TAG, VAL) \ 3478 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 3479 3480 if (bfd_link_executable (info)) 3481 { 3482 if (!add_dynamic_entry (DT_DEBUG, 0)) 3483 return FALSE; 3484 } 3485 3486 if (htab->elf.splt->size != 0) 3487 { 3488 /* DT_PLTGOT is used by prelink even if there is no PLT 3489 relocation. */ 3490 if (!add_dynamic_entry (DT_PLTGOT, 0)) 3491 return FALSE; 3492 3493 if (htab->elf.srelplt->size != 0) 3494 { 3495 if (!add_dynamic_entry (DT_PLTRELSZ, 0) 3496 || !add_dynamic_entry (DT_PLTREL, DT_REL) 3497 || !add_dynamic_entry (DT_JMPREL, 0)) 3498 return FALSE; 3499 } 3500 } 3501 3502 if (relocs) 3503 { 3504 if (!add_dynamic_entry (DT_REL, 0) 3505 || !add_dynamic_entry (DT_RELSZ, 0) 3506 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) 3507 return FALSE; 3508 3509 /* If any dynamic relocs apply to a read-only section, 3510 then we need a DT_TEXTREL entry. */ 3511 if ((info->flags & DF_TEXTREL) == 0) 3512 elf_link_hash_traverse (&htab->elf, 3513 elf_i386_readonly_dynrelocs, info); 3514 3515 if ((info->flags & DF_TEXTREL) != 0) 3516 { 3517 if (htab->readonly_dynrelocs_against_ifunc) 3518 { 3519 info->callbacks->einfo 3520 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n")); 3521 bfd_set_error (bfd_error_bad_value); 3522 return FALSE; 3523 } 3524 3525 if (!add_dynamic_entry (DT_TEXTREL, 0)) 3526 return FALSE; 3527 } 3528 } 3529 if (get_elf_i386_backend_data (output_bfd)->is_vxworks 3530 && !elf_vxworks_add_dynamic_entries (output_bfd, info)) 3531 return FALSE; 3532 } 3533#undef add_dynamic_entry 3534 3535 return TRUE; 3536} 3537 3538static bfd_boolean 3539elf_i386_always_size_sections (bfd *output_bfd, 3540 struct bfd_link_info *info) 3541{ 3542 asection *tls_sec = elf_hash_table (info)->tls_sec; 3543 3544 if (tls_sec) 3545 { 3546 struct elf_link_hash_entry *tlsbase; 3547 3548 tlsbase = elf_link_hash_lookup (elf_hash_table (info), 3549 "_TLS_MODULE_BASE_", 3550 FALSE, FALSE, FALSE); 3551 3552 if (tlsbase && tlsbase->type == STT_TLS) 3553 { 3554 struct elf_i386_link_hash_table *htab; 3555 struct bfd_link_hash_entry *bh = NULL; 3556 const struct elf_backend_data *bed 3557 = get_elf_backend_data (output_bfd); 3558 3559 htab = elf_i386_hash_table (info); 3560 if (htab == NULL) 3561 return FALSE; 3562 3563 if (!(_bfd_generic_link_add_one_symbol 3564 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, 3565 tls_sec, 0, NULL, FALSE, 3566 bed->collect, &bh))) 3567 return FALSE; 3568 3569 htab->tls_module_base = bh; 3570 3571 tlsbase = (struct elf_link_hash_entry *)bh; 3572 tlsbase->def_regular = 1; 3573 tlsbase->other = STV_HIDDEN; 3574 tlsbase->root.linker_def = 1; 3575 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); 3576 } 3577 } 3578 3579 return TRUE; 3580} 3581 3582/* Set the correct type for an x86 ELF section. We do this by the 3583 section name, which is a hack, but ought to work. */ 3584 3585static bfd_boolean 3586elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, 3587 Elf_Internal_Shdr *hdr, 3588 asection *sec) 3589{ 3590 const char *name; 3591 3592 name = bfd_get_section_name (abfd, sec); 3593 3594 /* This is an ugly, but unfortunately necessary hack that is 3595 needed when producing EFI binaries on x86. It tells 3596 elf.c:elf_fake_sections() not to consider ".reloc" as a section 3597 containing ELF relocation info. We need this hack in order to 3598 be able to generate ELF binaries that can be translated into 3599 EFI applications (which are essentially COFF objects). Those 3600 files contain a COFF ".reloc" section inside an ELFNN object, 3601 which would normally cause BFD to segfault because it would 3602 attempt to interpret this section as containing relocation 3603 entries for section "oc". With this hack enabled, ".reloc" 3604 will be treated as a normal data section, which will avoid the 3605 segfault. However, you won't be able to create an ELFNN binary 3606 with a section named "oc" that needs relocations, but that's 3607 the kind of ugly side-effects you get when detecting section 3608 types based on their names... In practice, this limitation is 3609 unlikely to bite. */ 3610 if (strcmp (name, ".reloc") == 0) 3611 hdr->sh_type = SHT_PROGBITS; 3612 3613 return TRUE; 3614} 3615 3616/* _TLS_MODULE_BASE_ needs to be treated especially when linking 3617 executables. Rather than setting it to the beginning of the TLS 3618 section, we have to set it to the end. This function may be called 3619 multiple times, it is idempotent. */ 3620 3621static void 3622elf_i386_set_tls_module_base (struct bfd_link_info *info) 3623{ 3624 struct elf_i386_link_hash_table *htab; 3625 struct bfd_link_hash_entry *base; 3626 3627 if (!bfd_link_executable (info)) 3628 return; 3629 3630 htab = elf_i386_hash_table (info); 3631 if (htab == NULL) 3632 return; 3633 3634 base = htab->tls_module_base; 3635 if (base == NULL) 3636 return; 3637 3638 base->u.def.value = htab->elf.tls_size; 3639} 3640 3641/* Return the base VMA address which should be subtracted from real addresses 3642 when resolving @dtpoff relocation. 3643 This is PT_TLS segment p_vaddr. */ 3644 3645static bfd_vma 3646elf_i386_dtpoff_base (struct bfd_link_info *info) 3647{ 3648 /* If tls_sec is NULL, we should have signalled an error already. */ 3649 if (elf_hash_table (info)->tls_sec == NULL) 3650 return 0; 3651 return elf_hash_table (info)->tls_sec->vma; 3652} 3653 3654/* Return the relocation value for @tpoff relocation 3655 if STT_TLS virtual address is ADDRESS. */ 3656 3657static bfd_vma 3658elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address) 3659{ 3660 struct elf_link_hash_table *htab = elf_hash_table (info); 3661 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); 3662 bfd_vma static_tls_size; 3663 3664 /* If tls_sec is NULL, we should have signalled an error already. */ 3665 if (htab->tls_sec == NULL) 3666 return 0; 3667 3668 /* Consider special static TLS alignment requirements. */ 3669 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); 3670 return static_tls_size + htab->tls_sec->vma - address; 3671} 3672 3673/* Relocate an i386 ELF section. */ 3674 3675static bfd_boolean 3676elf_i386_relocate_section (bfd *output_bfd, 3677 struct bfd_link_info *info, 3678 bfd *input_bfd, 3679 asection *input_section, 3680 bfd_byte *contents, 3681 Elf_Internal_Rela *relocs, 3682 Elf_Internal_Sym *local_syms, 3683 asection **local_sections) 3684{ 3685 struct elf_i386_link_hash_table *htab; 3686 Elf_Internal_Shdr *symtab_hdr; 3687 struct elf_link_hash_entry **sym_hashes; 3688 bfd_vma *local_got_offsets; 3689 bfd_vma *local_tlsdesc_gotents; 3690 Elf_Internal_Rela *rel; 3691 Elf_Internal_Rela *wrel; 3692 Elf_Internal_Rela *relend; 3693 bfd_boolean is_vxworks_tls; 3694 unsigned plt_entry_size; 3695 3696 BFD_ASSERT (is_i386_elf (input_bfd)); 3697 3698 /* Skip if check_relocs failed. */ 3699 if (input_section->check_relocs_failed) 3700 return FALSE; 3701 3702 htab = elf_i386_hash_table (info); 3703 if (htab == NULL) 3704 return FALSE; 3705 symtab_hdr = &elf_symtab_hdr (input_bfd); 3706 sym_hashes = elf_sym_hashes (input_bfd); 3707 local_got_offsets = elf_local_got_offsets (input_bfd); 3708 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd); 3709 /* We have to handle relocations in vxworks .tls_vars sections 3710 specially, because the dynamic loader is 'weird'. */ 3711 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks 3712 && bfd_link_pic (info) 3713 && !strcmp (input_section->output_section->name, 3714 ".tls_vars")); 3715 3716 elf_i386_set_tls_module_base (info); 3717 3718 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd); 3719 3720 rel = wrel = relocs; 3721 relend = relocs + input_section->reloc_count; 3722 for (; rel < relend; wrel++, rel++) 3723 { 3724 unsigned int r_type; 3725 reloc_howto_type *howto; 3726 unsigned long r_symndx; 3727 struct elf_link_hash_entry *h; 3728 struct elf_i386_link_hash_entry *eh; 3729 Elf_Internal_Sym *sym; 3730 asection *sec; 3731 bfd_vma off, offplt, plt_offset; 3732 bfd_vma relocation; 3733 bfd_boolean unresolved_reloc; 3734 bfd_reloc_status_type r; 3735 unsigned int indx; 3736 int tls_type; 3737 bfd_vma st_size; 3738 asection *resolved_plt; 3739 bfd_boolean resolved_to_zero; 3740 3741 r_type = ELF32_R_TYPE (rel->r_info); 3742 if (r_type == R_386_GNU_VTINHERIT 3743 || r_type == R_386_GNU_VTENTRY) 3744 { 3745 if (wrel != rel) 3746 *wrel = *rel; 3747 continue; 3748 } 3749 3750 if ((indx = r_type) >= R_386_standard 3751 && ((indx = r_type - R_386_ext_offset) - R_386_standard 3752 >= R_386_ext - R_386_standard) 3753 && ((indx = r_type - R_386_tls_offset) - R_386_ext 3754 >= R_386_ext2 - R_386_ext)) 3755 { 3756 (*_bfd_error_handler) 3757 (_("%B: unrecognized relocation (0x%x) in section `%A'"), 3758 input_bfd, input_section, r_type); 3759 bfd_set_error (bfd_error_bad_value); 3760 return FALSE; 3761 } 3762 howto = elf_howto_table + indx; 3763 3764 r_symndx = ELF32_R_SYM (rel->r_info); 3765 h = NULL; 3766 sym = NULL; 3767 sec = NULL; 3768 unresolved_reloc = FALSE; 3769 if (r_symndx < symtab_hdr->sh_info) 3770 { 3771 sym = local_syms + r_symndx; 3772 sec = local_sections[r_symndx]; 3773 relocation = (sec->output_section->vma 3774 + sec->output_offset 3775 + sym->st_value); 3776 st_size = sym->st_size; 3777 3778 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION 3779 && ((sec->flags & SEC_MERGE) != 0 3780 || (bfd_link_relocatable (info) 3781 && sec->output_offset != 0))) 3782 { 3783 bfd_vma addend; 3784 bfd_byte *where = contents + rel->r_offset; 3785 3786 switch (howto->size) 3787 { 3788 case 0: 3789 addend = bfd_get_8 (input_bfd, where); 3790 if (howto->pc_relative) 3791 { 3792 addend = (addend ^ 0x80) - 0x80; 3793 addend += 1; 3794 } 3795 break; 3796 case 1: 3797 addend = bfd_get_16 (input_bfd, where); 3798 if (howto->pc_relative) 3799 { 3800 addend = (addend ^ 0x8000) - 0x8000; 3801 addend += 2; 3802 } 3803 break; 3804 case 2: 3805 addend = bfd_get_32 (input_bfd, where); 3806 if (howto->pc_relative) 3807 { 3808 addend = (addend ^ 0x80000000) - 0x80000000; 3809 addend += 4; 3810 } 3811 break; 3812 default: 3813 abort (); 3814 } 3815 3816 if (bfd_link_relocatable (info)) 3817 addend += sec->output_offset; 3818 else 3819 { 3820 asection *msec = sec; 3821 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, 3822 addend); 3823 addend -= relocation; 3824 addend += msec->output_section->vma + msec->output_offset; 3825 } 3826 3827 switch (howto->size) 3828 { 3829 case 0: 3830 /* FIXME: overflow checks. */ 3831 if (howto->pc_relative) 3832 addend -= 1; 3833 bfd_put_8 (input_bfd, addend, where); 3834 break; 3835 case 1: 3836 if (howto->pc_relative) 3837 addend -= 2; 3838 bfd_put_16 (input_bfd, addend, where); 3839 break; 3840 case 2: 3841 if (howto->pc_relative) 3842 addend -= 4; 3843 bfd_put_32 (input_bfd, addend, where); 3844 break; 3845 } 3846 } 3847 else if (!bfd_link_relocatable (info) 3848 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) 3849 { 3850 /* Relocate against local STT_GNU_IFUNC symbol. */ 3851 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel, 3852 FALSE); 3853 if (h == NULL) 3854 abort (); 3855 3856 /* Set STT_GNU_IFUNC symbol value. */ 3857 h->root.u.def.value = sym->st_value; 3858 h->root.u.def.section = sec; 3859 } 3860 } 3861 else 3862 { 3863 bfd_boolean warned ATTRIBUTE_UNUSED; 3864 bfd_boolean ignored ATTRIBUTE_UNUSED; 3865 3866 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 3867 r_symndx, symtab_hdr, sym_hashes, 3868 h, sec, relocation, 3869 unresolved_reloc, warned, ignored); 3870 st_size = h->size; 3871 } 3872 3873 if (sec != NULL && discarded_section (sec)) 3874 { 3875 _bfd_clear_contents (howto, input_bfd, input_section, 3876 contents + rel->r_offset); 3877 wrel->r_offset = rel->r_offset; 3878 wrel->r_info = 0; 3879 wrel->r_addend = 0; 3880 3881 /* For ld -r, remove relocations in debug sections against 3882 sections defined in discarded sections. Not done for 3883 eh_frame editing code expects to be present. */ 3884 if (bfd_link_relocatable (info) 3885 && (input_section->flags & SEC_DEBUGGING)) 3886 wrel--; 3887 3888 continue; 3889 } 3890 3891 if (bfd_link_relocatable (info)) 3892 { 3893 if (wrel != rel) 3894 *wrel = *rel; 3895 continue; 3896 } 3897 3898 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle 3899 it here if it is defined in a non-shared object. */ 3900 if (h != NULL 3901 && h->type == STT_GNU_IFUNC 3902 && h->def_regular) 3903 { 3904 asection *plt, *gotplt, *base_got; 3905 bfd_vma plt_index; 3906 const char *name; 3907 3908 if ((input_section->flags & SEC_ALLOC) == 0) 3909 { 3910 /* Dynamic relocs are not propagated for SEC_DEBUGGING 3911 sections because such sections are not SEC_ALLOC and 3912 thus ld.so will not process them. */ 3913 if ((input_section->flags & SEC_DEBUGGING) != 0) 3914 continue; 3915 abort (); 3916 } 3917 3918 /* STT_GNU_IFUNC symbol must go through PLT. */ 3919 if (htab->elf.splt != NULL) 3920 { 3921 plt = htab->elf.splt; 3922 gotplt = htab->elf.sgotplt; 3923 } 3924 else 3925 { 3926 plt = htab->elf.iplt; 3927 gotplt = htab->elf.igotplt; 3928 } 3929 3930 switch (r_type) 3931 { 3932 default: 3933 break; 3934 3935 case R_386_GOT32: 3936 case R_386_GOT32X: 3937 base_got = htab->elf.sgot; 3938 off = h->got.offset; 3939 3940 if (base_got == NULL) 3941 abort (); 3942 3943 if (off == (bfd_vma) -1) 3944 { 3945 /* We can't use h->got.offset here to save state, or 3946 even just remember the offset, as finish_dynamic_symbol 3947 would use that as offset into .got. */ 3948 3949 if (h->plt.offset == (bfd_vma) -1) 3950 abort (); 3951 3952 if (htab->elf.splt != NULL) 3953 { 3954 plt_index = h->plt.offset / plt_entry_size - 1; 3955 off = (plt_index + 3) * 4; 3956 base_got = htab->elf.sgotplt; 3957 } 3958 else 3959 { 3960 plt_index = h->plt.offset / plt_entry_size; 3961 off = plt_index * 4; 3962 base_got = htab->elf.igotplt; 3963 } 3964 3965 if (h->dynindx == -1 3966 || h->forced_local 3967 || info->symbolic) 3968 { 3969 /* This references the local defitionion. We must 3970 initialize this entry in the global offset table. 3971 Since the offset must always be a multiple of 8, 3972 we use the least significant bit to record 3973 whether we have initialized it already. 3974 3975 When doing a dynamic link, we create a .rela.got 3976 relocation entry to initialize the value. This 3977 is done in the finish_dynamic_symbol routine. */ 3978 if ((off & 1) != 0) 3979 off &= ~1; 3980 else 3981 { 3982 bfd_put_32 (output_bfd, relocation, 3983 base_got->contents + off); 3984 h->got.offset |= 1; 3985 } 3986 } 3987 3988 relocation = off; 3989 } 3990 else 3991 relocation = (base_got->output_section->vma 3992 + base_got->output_offset + off 3993 - gotplt->output_section->vma 3994 - gotplt->output_offset); 3995 3996 if ((*(contents + rel->r_offset - 1) & 0xc7) == 0x5) 3997 { 3998 if (bfd_link_pic (info)) 3999 goto disallow_got32; 4000 4001 /* Add the GOT base if there is no base register. */ 4002 relocation += (gotplt->output_section->vma 4003 + gotplt->output_offset); 4004 } 4005 else if (htab->elf.splt == NULL) 4006 { 4007 /* Adjust for static executables. */ 4008 relocation += gotplt->output_offset; 4009 } 4010 4011 goto do_relocation; 4012 } 4013 4014 if (h->plt.offset == (bfd_vma) -1) 4015 { 4016 /* Handle static pointers of STT_GNU_IFUNC symbols. */ 4017 if (r_type == R_386_32 4018 && (input_section->flags & SEC_CODE) == 0) 4019 goto do_ifunc_pointer; 4020 goto bad_ifunc_reloc; 4021 } 4022 4023 relocation = (plt->output_section->vma 4024 + plt->output_offset + h->plt.offset); 4025 4026 switch (r_type) 4027 { 4028 default: 4029bad_ifunc_reloc: 4030 if (h->root.root.string) 4031 name = h->root.root.string; 4032 else 4033 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, 4034 NULL); 4035 (*_bfd_error_handler) 4036 (_("%B: relocation %s against STT_GNU_IFUNC " 4037 "symbol `%s' isn't supported"), input_bfd, 4038 howto->name, name); 4039 bfd_set_error (bfd_error_bad_value); 4040 return FALSE; 4041 4042 case R_386_32: 4043 /* Generate dynamic relcoation only when there is a 4044 non-GOT reference in a shared object. */ 4045 if ((bfd_link_pic (info) && h->non_got_ref) 4046 || h->plt.offset == (bfd_vma) -1) 4047 { 4048 Elf_Internal_Rela outrel; 4049 asection *sreloc; 4050 bfd_vma offset; 4051 4052do_ifunc_pointer: 4053 /* Need a dynamic relocation to get the real function 4054 adddress. */ 4055 offset = _bfd_elf_section_offset (output_bfd, 4056 info, 4057 input_section, 4058 rel->r_offset); 4059 if (offset == (bfd_vma) -1 4060 || offset == (bfd_vma) -2) 4061 abort (); 4062 4063 outrel.r_offset = (input_section->output_section->vma 4064 + input_section->output_offset 4065 + offset); 4066 4067 if (h->dynindx == -1 4068 || h->forced_local 4069 || bfd_link_executable (info)) 4070 { 4071 /* This symbol is resolved locally. */ 4072 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); 4073 bfd_put_32 (output_bfd, 4074 (h->root.u.def.value 4075 + h->root.u.def.section->output_section->vma 4076 + h->root.u.def.section->output_offset), 4077 contents + offset); 4078 } 4079 else 4080 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 4081 4082 /* Dynamic relocations are stored in 4083 1. .rel.ifunc section in PIC object. 4084 2. .rel.got section in dynamic executable. 4085 3. .rel.iplt section in static executable. */ 4086 if (bfd_link_pic (info)) 4087 sreloc = htab->elf.irelifunc; 4088 else if (htab->elf.splt != NULL) 4089 sreloc = htab->elf.srelgot; 4090 else 4091 sreloc = htab->elf.irelplt; 4092 elf_append_rel (output_bfd, sreloc, &outrel); 4093 4094 /* If this reloc is against an external symbol, we 4095 do not want to fiddle with the addend. Otherwise, 4096 we need to include the symbol value so that it 4097 becomes an addend for the dynamic reloc. For an 4098 internal symbol, we have updated addend. */ 4099 continue; 4100 } 4101 /* FALLTHROUGH */ 4102 case R_386_PC32: 4103 case R_386_PLT32: 4104 goto do_relocation; 4105 4106 case R_386_GOTOFF: 4107 relocation -= (gotplt->output_section->vma 4108 + gotplt->output_offset); 4109 goto do_relocation; 4110 } 4111 } 4112 4113 eh = (struct elf_i386_link_hash_entry *) h; 4114 resolved_to_zero = (eh != NULL 4115 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, 4116 eh->has_got_reloc, 4117 eh)); 4118 4119 switch (r_type) 4120 { 4121 case R_386_GOT32X: 4122 /* Avoid optimizing _DYNAMIC since ld.so may use its 4123 link-time address. */ 4124 if (h == htab->elf.hdynamic) 4125 goto r_386_got32; 4126 4127 if (bfd_link_pic (info)) 4128 { 4129 /* It is OK to convert mov to lea and convert indirect 4130 branch to direct branch. It is OK to convert adc, 4131 add, and, cmp, or, sbb, sub, test, xor only when PIC 4132 is false. */ 4133 unsigned int opcode, addend; 4134 addend = bfd_get_32 (input_bfd, contents + rel->r_offset); 4135 if (addend != 0) 4136 goto r_386_got32; 4137 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 4138 if (opcode != 0x8b && opcode != 0xff) 4139 goto r_386_got32; 4140 } 4141 4142 /* Resolve "mov GOT[(%reg)], %reg", 4143 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]" 4144 and "binop foo@GOT[(%reg)], %reg". */ 4145 if (h == NULL 4146 || (h->plt.offset == (bfd_vma) -1 4147 && h->got.offset == (bfd_vma) -1) 4148 || htab->elf.sgotplt == NULL) 4149 abort (); 4150 4151 offplt = (htab->elf.sgotplt->output_section->vma 4152 + htab->elf.sgotplt->output_offset); 4153 4154 /* It is relative to .got.plt section. */ 4155 if (h->got.offset != (bfd_vma) -1) 4156 /* Use GOT entry. Mask off the least significant bit in 4157 GOT offset which may be set by R_386_GOT32 processing 4158 below. */ 4159 relocation = (htab->elf.sgot->output_section->vma 4160 + htab->elf.sgot->output_offset 4161 + (h->got.offset & ~1) - offplt); 4162 else 4163 /* Use GOTPLT entry. */ 4164 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4; 4165 4166 if (!bfd_link_pic (info)) 4167 { 4168 /* If not PIC, add the .got.plt section address for 4169 baseless addressing. */ 4170 unsigned int modrm; 4171 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 4172 if ((modrm & 0xc7) == 0x5) 4173 relocation += offplt; 4174 } 4175 4176 unresolved_reloc = FALSE; 4177 break; 4178 4179 case R_386_GOT32: 4180r_386_got32: 4181 /* Relocation is to the entry for this symbol in the global 4182 offset table. */ 4183 if (htab->elf.sgot == NULL) 4184 abort (); 4185 4186 if (h != NULL) 4187 { 4188 bfd_boolean dyn; 4189 4190 off = h->got.offset; 4191 dyn = htab->elf.dynamic_sections_created; 4192 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 4193 bfd_link_pic (info), 4194 h) 4195 || (bfd_link_pic (info) 4196 && SYMBOL_REFERENCES_LOCAL (info, h)) 4197 || (ELF_ST_VISIBILITY (h->other) 4198 && h->root.type == bfd_link_hash_undefweak)) 4199 { 4200 /* This is actually a static link, or it is a 4201 -Bsymbolic link and the symbol is defined 4202 locally, or the symbol was forced to be local 4203 because of a version file. We must initialize 4204 this entry in the global offset table. Since the 4205 offset must always be a multiple of 4, we use the 4206 least significant bit to record whether we have 4207 initialized it already. 4208 4209 When doing a dynamic link, we create a .rel.got 4210 relocation entry to initialize the value. This 4211 is done in the finish_dynamic_symbol routine. */ 4212 if ((off & 1) != 0) 4213 off &= ~1; 4214 else 4215 { 4216 bfd_put_32 (output_bfd, relocation, 4217 htab->elf.sgot->contents + off); 4218 h->got.offset |= 1; 4219 } 4220 } 4221 else 4222 unresolved_reloc = FALSE; 4223 } 4224 else 4225 { 4226 if (local_got_offsets == NULL) 4227 abort (); 4228 4229 off = local_got_offsets[r_symndx]; 4230 4231 /* The offset must always be a multiple of 4. We use 4232 the least significant bit to record whether we have 4233 already generated the necessary reloc. */ 4234 if ((off & 1) != 0) 4235 off &= ~1; 4236 else 4237 { 4238 bfd_put_32 (output_bfd, relocation, 4239 htab->elf.sgot->contents + off); 4240 4241 if (bfd_link_pic (info)) 4242 { 4243 asection *s; 4244 Elf_Internal_Rela outrel; 4245 4246 s = htab->elf.srelgot; 4247 if (s == NULL) 4248 abort (); 4249 4250 outrel.r_offset = (htab->elf.sgot->output_section->vma 4251 + htab->elf.sgot->output_offset 4252 + off); 4253 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 4254 elf_append_rel (output_bfd, s, &outrel); 4255 } 4256 4257 local_got_offsets[r_symndx] |= 1; 4258 } 4259 } 4260 4261 if (off >= (bfd_vma) -2) 4262 abort (); 4263 4264 relocation = (htab->elf.sgot->output_section->vma 4265 + htab->elf.sgot->output_offset + off); 4266 if ((*(contents + rel->r_offset - 1) & 0xc7) == 0x5) 4267 { 4268 if (bfd_link_pic (info)) 4269 { 4270 /* For PIC, disallow R_386_GOT32 without a base 4271 register since we don't know what the GOT base 4272 is. */ 4273 const char *name; 4274 4275disallow_got32: 4276 if (h == NULL) 4277 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, 4278 NULL); 4279 else 4280 name = h->root.root.string; 4281 4282 (*_bfd_error_handler) 4283 (_("%B: direct GOT relocation %s against `%s' without base register can not be used when making a shared object"), 4284 input_bfd, howto->name, name); 4285 bfd_set_error (bfd_error_bad_value); 4286 return FALSE; 4287 } 4288 } 4289 else 4290 { 4291 /* Subtract the .got.plt section address only with a base 4292 register. */ 4293 relocation -= (htab->elf.sgotplt->output_section->vma 4294 + htab->elf.sgotplt->output_offset); 4295 } 4296 4297 break; 4298 4299 case R_386_GOTOFF: 4300 /* Relocation is relative to the start of the global offset 4301 table. */ 4302 4303 /* Check to make sure it isn't a protected function or data 4304 symbol for shared library since it may not be local when 4305 used as function address or with copy relocation. We also 4306 need to make sure that a symbol is referenced locally. */ 4307 if (!bfd_link_executable (info) && h) 4308 { 4309 if (!h->def_regular) 4310 { 4311 const char *v; 4312 4313 switch (ELF_ST_VISIBILITY (h->other)) 4314 { 4315 case STV_HIDDEN: 4316 v = _("hidden symbol"); 4317 break; 4318 case STV_INTERNAL: 4319 v = _("internal symbol"); 4320 break; 4321 case STV_PROTECTED: 4322 v = _("protected symbol"); 4323 break; 4324 default: 4325 v = _("symbol"); 4326 break; 4327 } 4328 4329 (*_bfd_error_handler) 4330 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"), 4331 input_bfd, v, h->root.root.string); 4332 bfd_set_error (bfd_error_bad_value); 4333 return FALSE; 4334 } 4335 else if (!SYMBOL_REFERENCES_LOCAL (info, h) 4336 && (h->type == STT_FUNC 4337 || h->type == STT_OBJECT) 4338 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) 4339 { 4340 (*_bfd_error_handler) 4341 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"), 4342 input_bfd, 4343 h->type == STT_FUNC ? "function" : "data", 4344 h->root.root.string); 4345 bfd_set_error (bfd_error_bad_value); 4346 return FALSE; 4347 } 4348 } 4349 4350 /* Note that sgot is not involved in this 4351 calculation. We always want the start of .got.plt. If we 4352 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is 4353 permitted by the ABI, we might have to change this 4354 calculation. */ 4355 relocation -= htab->elf.sgotplt->output_section->vma 4356 + htab->elf.sgotplt->output_offset; 4357 break; 4358 4359 case R_386_GOTPC: 4360 /* Use global offset table as symbol value. */ 4361 relocation = htab->elf.sgotplt->output_section->vma 4362 + htab->elf.sgotplt->output_offset; 4363 unresolved_reloc = FALSE; 4364 break; 4365 4366 case R_386_PLT32: 4367 /* Relocation is to the entry for this symbol in the 4368 procedure linkage table. */ 4369 4370 /* Resolve a PLT32 reloc against a local symbol directly, 4371 without using the procedure linkage table. */ 4372 if (h == NULL) 4373 break; 4374 4375 if ((h->plt.offset == (bfd_vma) -1 4376 && eh->plt_got.offset == (bfd_vma) -1) 4377 || htab->elf.splt == NULL) 4378 { 4379 /* We didn't make a PLT entry for this symbol. This 4380 happens when statically linking PIC code, or when 4381 using -Bsymbolic. */ 4382 break; 4383 } 4384 4385 if (h->plt.offset != (bfd_vma) -1) 4386 { 4387 resolved_plt = htab->elf.splt; 4388 plt_offset = h->plt.offset; 4389 } 4390 else 4391 { 4392 resolved_plt = htab->plt_got; 4393 plt_offset = eh->plt_got.offset; 4394 } 4395 4396 relocation = (resolved_plt->output_section->vma 4397 + resolved_plt->output_offset 4398 + plt_offset); 4399 unresolved_reloc = FALSE; 4400 break; 4401 4402 case R_386_SIZE32: 4403 /* Set to symbol size. */ 4404 relocation = st_size; 4405 /* Fall through. */ 4406 4407 case R_386_32: 4408 case R_386_PC32: 4409 if ((input_section->flags & SEC_ALLOC) == 0 4410 || is_vxworks_tls) 4411 break; 4412 4413 /* Copy dynamic function pointer relocations. Don't generate 4414 dynamic relocations against resolved undefined weak symbols 4415 in PIE, except for R_386_PC32. */ 4416 if ((bfd_link_pic (info) 4417 && (h == NULL 4418 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 4419 && (!resolved_to_zero 4420 || r_type == R_386_PC32)) 4421 || h->root.type != bfd_link_hash_undefweak)) 4422 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32) 4423 || !SYMBOL_CALLS_LOCAL (info, h))) 4424 || (ELIMINATE_COPY_RELOCS 4425 && !bfd_link_pic (info) 4426 && h != NULL 4427 && h->dynindx != -1 4428 && (!h->non_got_ref 4429 || eh->func_pointer_refcount > 0 4430 || (h->root.type == bfd_link_hash_undefweak 4431 && !resolved_to_zero)) 4432 && ((h->def_dynamic && !h->def_regular) 4433 /* Undefined weak symbol is bound locally when 4434 PIC is false. */ 4435 || h->root.type == bfd_link_hash_undefweak))) 4436 { 4437 Elf_Internal_Rela outrel; 4438 bfd_boolean skip, relocate; 4439 asection *sreloc; 4440 4441 /* When generating a shared object, these relocations 4442 are copied into the output file to be resolved at run 4443 time. */ 4444 4445 skip = FALSE; 4446 relocate = FALSE; 4447 4448 outrel.r_offset = 4449 _bfd_elf_section_offset (output_bfd, info, input_section, 4450 rel->r_offset); 4451 if (outrel.r_offset == (bfd_vma) -1) 4452 skip = TRUE; 4453 else if (outrel.r_offset == (bfd_vma) -2) 4454 skip = TRUE, relocate = TRUE; 4455 outrel.r_offset += (input_section->output_section->vma 4456 + input_section->output_offset); 4457 4458 if (skip) 4459 memset (&outrel, 0, sizeof outrel); 4460 else if (h != NULL 4461 && h->dynindx != -1 4462 && (r_type == R_386_PC32 4463 || !(bfd_link_executable (info) 4464 || SYMBOLIC_BIND (info, h)) 4465 || !h->def_regular)) 4466 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 4467 else 4468 { 4469 /* This symbol is local, or marked to become local. */ 4470 relocate = TRUE; 4471 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 4472 } 4473 4474 sreloc = elf_section_data (input_section)->sreloc; 4475 4476 if (sreloc == NULL || sreloc->contents == NULL) 4477 { 4478 r = bfd_reloc_notsupported; 4479 goto check_relocation_error; 4480 } 4481 4482 elf_append_rel (output_bfd, sreloc, &outrel); 4483 4484 /* If this reloc is against an external symbol, we do 4485 not want to fiddle with the addend. Otherwise, we 4486 need to include the symbol value so that it becomes 4487 an addend for the dynamic reloc. */ 4488 if (! relocate) 4489 continue; 4490 } 4491 break; 4492 4493 case R_386_TLS_IE: 4494 if (!bfd_link_executable (info)) 4495 { 4496 Elf_Internal_Rela outrel; 4497 asection *sreloc; 4498 4499 outrel.r_offset = rel->r_offset 4500 + input_section->output_section->vma 4501 + input_section->output_offset; 4502 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 4503 sreloc = elf_section_data (input_section)->sreloc; 4504 if (sreloc == NULL) 4505 abort (); 4506 elf_append_rel (output_bfd, sreloc, &outrel); 4507 } 4508 /* Fall through */ 4509 4510 case R_386_TLS_GD: 4511 case R_386_TLS_GOTDESC: 4512 case R_386_TLS_DESC_CALL: 4513 case R_386_TLS_IE_32: 4514 case R_386_TLS_GOTIE: 4515 tls_type = GOT_UNKNOWN; 4516 if (h == NULL && local_got_offsets) 4517 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx]; 4518 else if (h != NULL) 4519 tls_type = elf_i386_hash_entry(h)->tls_type; 4520 if (tls_type == GOT_TLS_IE) 4521 tls_type = GOT_TLS_IE_NEG; 4522 4523 if (! elf_i386_tls_transition (info, input_bfd, 4524 input_section, contents, 4525 symtab_hdr, sym_hashes, 4526 &r_type, tls_type, rel, 4527 relend, h, r_symndx, TRUE)) 4528 return FALSE; 4529 4530 if (r_type == R_386_TLS_LE_32) 4531 { 4532 BFD_ASSERT (! unresolved_reloc); 4533 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) 4534 { 4535 unsigned int type; 4536 bfd_vma roff; 4537 4538 /* GD->LE transition. */ 4539 type = *(contents + rel->r_offset - 2); 4540 if (type == 0x04) 4541 { 4542 /* Change 4543 leal foo@tlsgd(,%ebx,1), %eax 4544 call ___tls_get_addr@PLT 4545 into: 4546 movl %gs:0, %eax 4547 subl $foo@tpoff, %eax 4548 (6 byte form of subl). */ 4549 roff = rel->r_offset + 5; 4550 } 4551 else 4552 { 4553 /* Change 4554 leal foo@tlsgd(%ebx), %eax 4555 call ___tls_get_addr@PLT 4556 nop 4557 or 4558 leal foo@tlsgd(%reg), %eax 4559 call *___tls_get_addr@GOT(%reg) 4560 which may be converted to 4561 addr32 call ___tls_get_addr 4562 into: 4563 movl %gs:0, %eax; subl $foo@tpoff, %eax 4564 (6 byte form of subl). */ 4565 roff = rel->r_offset + 6; 4566 } 4567 memcpy (contents + roff - 8, 4568 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); 4569 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), 4570 contents + roff); 4571 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */ 4572 rel++; 4573 wrel++; 4574 continue; 4575 } 4576 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) 4577 { 4578 /* GDesc -> LE transition. 4579 It's originally something like: 4580 leal x@tlsdesc(%ebx), %eax 4581 4582 leal x@ntpoff, %eax 4583 4584 Registers other than %eax may be set up here. */ 4585 4586 unsigned int val; 4587 bfd_vma roff; 4588 4589 roff = rel->r_offset; 4590 val = bfd_get_8 (input_bfd, contents + roff - 1); 4591 4592 /* Now modify the instruction as appropriate. */ 4593 /* aoliva FIXME: remove the above and xor the byte 4594 below with 0x86. */ 4595 bfd_put_8 (output_bfd, val ^ 0x86, 4596 contents + roff - 1); 4597 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 4598 contents + roff); 4599 continue; 4600 } 4601 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) 4602 { 4603 /* GDesc -> LE transition. 4604 It's originally: 4605 call *(%eax) 4606 Turn it into: 4607 xchg %ax,%ax */ 4608 4609 bfd_vma roff; 4610 4611 roff = rel->r_offset; 4612 bfd_put_8 (output_bfd, 0x66, contents + roff); 4613 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 4614 continue; 4615 } 4616 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE) 4617 { 4618 unsigned int val; 4619 4620 /* IE->LE transition: 4621 Originally it can be one of: 4622 movl foo, %eax 4623 movl foo, %reg 4624 addl foo, %reg 4625 We change it into: 4626 movl $foo, %eax 4627 movl $foo, %reg 4628 addl $foo, %reg. */ 4629 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 4630 if (val == 0xa1) 4631 { 4632 /* movl foo, %eax. */ 4633 bfd_put_8 (output_bfd, 0xb8, 4634 contents + rel->r_offset - 1); 4635 } 4636 else 4637 { 4638 unsigned int type; 4639 4640 type = bfd_get_8 (input_bfd, 4641 contents + rel->r_offset - 2); 4642 switch (type) 4643 { 4644 case 0x8b: 4645 /* movl */ 4646 bfd_put_8 (output_bfd, 0xc7, 4647 contents + rel->r_offset - 2); 4648 bfd_put_8 (output_bfd, 4649 0xc0 | ((val >> 3) & 7), 4650 contents + rel->r_offset - 1); 4651 break; 4652 case 0x03: 4653 /* addl */ 4654 bfd_put_8 (output_bfd, 0x81, 4655 contents + rel->r_offset - 2); 4656 bfd_put_8 (output_bfd, 4657 0xc0 | ((val >> 3) & 7), 4658 contents + rel->r_offset - 1); 4659 break; 4660 default: 4661 BFD_FAIL (); 4662 break; 4663 } 4664 } 4665 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 4666 contents + rel->r_offset); 4667 continue; 4668 } 4669 else 4670 { 4671 unsigned int val, type; 4672 4673 /* {IE_32,GOTIE}->LE transition: 4674 Originally it can be one of: 4675 subl foo(%reg1), %reg2 4676 movl foo(%reg1), %reg2 4677 addl foo(%reg1), %reg2 4678 We change it into: 4679 subl $foo, %reg2 4680 movl $foo, %reg2 (6 byte form) 4681 addl $foo, %reg2. */ 4682 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 4683 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 4684 if (type == 0x8b) 4685 { 4686 /* movl */ 4687 bfd_put_8 (output_bfd, 0xc7, 4688 contents + rel->r_offset - 2); 4689 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 4690 contents + rel->r_offset - 1); 4691 } 4692 else if (type == 0x2b) 4693 { 4694 /* subl */ 4695 bfd_put_8 (output_bfd, 0x81, 4696 contents + rel->r_offset - 2); 4697 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), 4698 contents + rel->r_offset - 1); 4699 } 4700 else if (type == 0x03) 4701 { 4702 /* addl */ 4703 bfd_put_8 (output_bfd, 0x81, 4704 contents + rel->r_offset - 2); 4705 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 4706 contents + rel->r_offset - 1); 4707 } 4708 else 4709 BFD_FAIL (); 4710 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE) 4711 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), 4712 contents + rel->r_offset); 4713 else 4714 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), 4715 contents + rel->r_offset); 4716 continue; 4717 } 4718 } 4719 4720 if (htab->elf.sgot == NULL) 4721 abort (); 4722 4723 if (h != NULL) 4724 { 4725 off = h->got.offset; 4726 offplt = elf_i386_hash_entry (h)->tlsdesc_got; 4727 } 4728 else 4729 { 4730 if (local_got_offsets == NULL) 4731 abort (); 4732 4733 off = local_got_offsets[r_symndx]; 4734 offplt = local_tlsdesc_gotents[r_symndx]; 4735 } 4736 4737 if ((off & 1) != 0) 4738 off &= ~1; 4739 else 4740 { 4741 Elf_Internal_Rela outrel; 4742 int dr_type; 4743 asection *sreloc; 4744 4745 if (htab->elf.srelgot == NULL) 4746 abort (); 4747 4748 indx = h && h->dynindx != -1 ? h->dynindx : 0; 4749 4750 if (GOT_TLS_GDESC_P (tls_type)) 4751 { 4752 bfd_byte *loc; 4753 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC); 4754 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8 4755 <= htab->elf.sgotplt->size); 4756 outrel.r_offset = (htab->elf.sgotplt->output_section->vma 4757 + htab->elf.sgotplt->output_offset 4758 + offplt 4759 + htab->sgotplt_jump_table_size); 4760 sreloc = htab->elf.srelplt; 4761 loc = sreloc->contents; 4762 loc += (htab->next_tls_desc_index++ 4763 * sizeof (Elf32_External_Rel)); 4764 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 4765 <= sreloc->contents + sreloc->size); 4766 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 4767 if (indx == 0) 4768 { 4769 BFD_ASSERT (! unresolved_reloc); 4770 bfd_put_32 (output_bfd, 4771 relocation - elf_i386_dtpoff_base (info), 4772 htab->elf.sgotplt->contents + offplt 4773 + htab->sgotplt_jump_table_size + 4); 4774 } 4775 else 4776 { 4777 bfd_put_32 (output_bfd, 0, 4778 htab->elf.sgotplt->contents + offplt 4779 + htab->sgotplt_jump_table_size + 4); 4780 } 4781 } 4782 4783 sreloc = htab->elf.srelgot; 4784 4785 outrel.r_offset = (htab->elf.sgot->output_section->vma 4786 + htab->elf.sgot->output_offset + off); 4787 4788 if (GOT_TLS_GD_P (tls_type)) 4789 dr_type = R_386_TLS_DTPMOD32; 4790 else if (GOT_TLS_GDESC_P (tls_type)) 4791 goto dr_done; 4792 else if (tls_type == GOT_TLS_IE_POS) 4793 dr_type = R_386_TLS_TPOFF; 4794 else 4795 dr_type = R_386_TLS_TPOFF32; 4796 4797 if (dr_type == R_386_TLS_TPOFF && indx == 0) 4798 bfd_put_32 (output_bfd, 4799 relocation - elf_i386_dtpoff_base (info), 4800 htab->elf.sgot->contents + off); 4801 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) 4802 bfd_put_32 (output_bfd, 4803 elf_i386_dtpoff_base (info) - relocation, 4804 htab->elf.sgot->contents + off); 4805 else if (dr_type != R_386_TLS_DESC) 4806 bfd_put_32 (output_bfd, 0, 4807 htab->elf.sgot->contents + off); 4808 outrel.r_info = ELF32_R_INFO (indx, dr_type); 4809 4810 elf_append_rel (output_bfd, sreloc, &outrel); 4811 4812 if (GOT_TLS_GD_P (tls_type)) 4813 { 4814 if (indx == 0) 4815 { 4816 BFD_ASSERT (! unresolved_reloc); 4817 bfd_put_32 (output_bfd, 4818 relocation - elf_i386_dtpoff_base (info), 4819 htab->elf.sgot->contents + off + 4); 4820 } 4821 else 4822 { 4823 bfd_put_32 (output_bfd, 0, 4824 htab->elf.sgot->contents + off + 4); 4825 outrel.r_info = ELF32_R_INFO (indx, 4826 R_386_TLS_DTPOFF32); 4827 outrel.r_offset += 4; 4828 elf_append_rel (output_bfd, sreloc, &outrel); 4829 } 4830 } 4831 else if (tls_type == GOT_TLS_IE_BOTH) 4832 { 4833 bfd_put_32 (output_bfd, 4834 (indx == 0 4835 ? relocation - elf_i386_dtpoff_base (info) 4836 : 0), 4837 htab->elf.sgot->contents + off + 4); 4838 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 4839 outrel.r_offset += 4; 4840 elf_append_rel (output_bfd, sreloc, &outrel); 4841 } 4842 4843 dr_done: 4844 if (h != NULL) 4845 h->got.offset |= 1; 4846 else 4847 local_got_offsets[r_symndx] |= 1; 4848 } 4849 4850 if (off >= (bfd_vma) -2 4851 && ! GOT_TLS_GDESC_P (tls_type)) 4852 abort (); 4853 if (r_type == R_386_TLS_GOTDESC 4854 || r_type == R_386_TLS_DESC_CALL) 4855 { 4856 relocation = htab->sgotplt_jump_table_size + offplt; 4857 unresolved_reloc = FALSE; 4858 } 4859 else if (r_type == ELF32_R_TYPE (rel->r_info)) 4860 { 4861 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma 4862 + htab->elf.sgotplt->output_offset; 4863 relocation = htab->elf.sgot->output_section->vma 4864 + htab->elf.sgot->output_offset + off - g_o_t; 4865 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) 4866 && tls_type == GOT_TLS_IE_BOTH) 4867 relocation += 4; 4868 if (r_type == R_386_TLS_IE) 4869 relocation += g_o_t; 4870 unresolved_reloc = FALSE; 4871 } 4872 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) 4873 { 4874 unsigned int val, type; 4875 bfd_vma roff; 4876 4877 /* GD->IE transition. */ 4878 type = *(contents + rel->r_offset - 2); 4879 val = *(contents + rel->r_offset - 1); 4880 if (type == 0x04) 4881 { 4882 /* Change 4883 leal foo@tlsgd(,%ebx,1), %eax 4884 call ___tls_get_addr@PLT 4885 into: 4886 movl %gs:0, %eax 4887 subl $foo@gottpoff(%ebx), %eax. */ 4888 val >>= 3; 4889 roff = rel->r_offset - 3; 4890 } 4891 else 4892 { 4893 /* Change 4894 leal foo@tlsgd(%ebx), %eax 4895 call ___tls_get_addr@PLT 4896 nop 4897 or 4898 leal foo@tlsgd(%reg), %eax 4899 call *___tls_get_addr@GOT(%reg) 4900 which may be converted to 4901 addr32 call ___tls_get_addr 4902 into: 4903 movl %gs:0, %eax; 4904 subl $foo@gottpoff(%reg), %eax. */ 4905 roff = rel->r_offset - 2; 4906 } 4907 memcpy (contents + roff, 4908 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); 4909 contents[roff + 7] = 0x80 | (val & 7); 4910 /* If foo is used only with foo@gotntpoff(%reg) and 4911 foo@indntpoff, but not with foo@gottpoff(%reg), change 4912 subl $foo@gottpoff(%reg), %eax 4913 into: 4914 addl $foo@gotntpoff(%reg), %eax. */ 4915 if (tls_type == GOT_TLS_IE_POS) 4916 contents[roff + 6] = 0x03; 4917 bfd_put_32 (output_bfd, 4918 htab->elf.sgot->output_section->vma 4919 + htab->elf.sgot->output_offset + off 4920 - htab->elf.sgotplt->output_section->vma 4921 - htab->elf.sgotplt->output_offset, 4922 contents + roff + 8); 4923 /* Skip R_386_PLT32 and R_386_GOT32X. */ 4924 rel++; 4925 wrel++; 4926 continue; 4927 } 4928 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) 4929 { 4930 /* GDesc -> IE transition. 4931 It's originally something like: 4932 leal x@tlsdesc(%ebx), %eax 4933 4934 Change it to: 4935 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax 4936 or: 4937 movl x@gottpoff(%ebx), %eax # before negl %eax 4938 4939 Registers other than %eax may be set up here. */ 4940 4941 bfd_vma roff; 4942 4943 /* First, make sure it's a leal adding ebx to a 32-bit 4944 offset into any register, although it's probably 4945 almost always going to be eax. */ 4946 roff = rel->r_offset; 4947 4948 /* Now modify the instruction as appropriate. */ 4949 /* To turn a leal into a movl in the form we use it, it 4950 suffices to change the first byte from 0x8d to 0x8b. 4951 aoliva FIXME: should we decide to keep the leal, all 4952 we have to do is remove the statement below, and 4953 adjust the relaxation of R_386_TLS_DESC_CALL. */ 4954 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); 4955 4956 if (tls_type == GOT_TLS_IE_BOTH) 4957 off += 4; 4958 4959 bfd_put_32 (output_bfd, 4960 htab->elf.sgot->output_section->vma 4961 + htab->elf.sgot->output_offset + off 4962 - htab->elf.sgotplt->output_section->vma 4963 - htab->elf.sgotplt->output_offset, 4964 contents + roff); 4965 continue; 4966 } 4967 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) 4968 { 4969 /* GDesc -> IE transition. 4970 It's originally: 4971 call *(%eax) 4972 4973 Change it to: 4974 xchg %ax,%ax 4975 or 4976 negl %eax 4977 depending on how we transformed the TLS_GOTDESC above. 4978 */ 4979 4980 bfd_vma roff; 4981 4982 roff = rel->r_offset; 4983 4984 /* Now modify the instruction as appropriate. */ 4985 if (tls_type != GOT_TLS_IE_NEG) 4986 { 4987 /* xchg %ax,%ax */ 4988 bfd_put_8 (output_bfd, 0x66, contents + roff); 4989 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 4990 } 4991 else 4992 { 4993 /* negl %eax */ 4994 bfd_put_8 (output_bfd, 0xf7, contents + roff); 4995 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1); 4996 } 4997 4998 continue; 4999 } 5000 else 5001 BFD_ASSERT (FALSE); 5002 break; 5003 5004 case R_386_TLS_LDM: 5005 if (! elf_i386_tls_transition (info, input_bfd, 5006 input_section, contents, 5007 symtab_hdr, sym_hashes, 5008 &r_type, GOT_UNKNOWN, rel, 5009 relend, h, r_symndx, TRUE)) 5010 return FALSE; 5011 5012 if (r_type != R_386_TLS_LDM) 5013 { 5014 /* LD->LE transition. Change 5015 leal foo@tlsldm(%ebx) %eax 5016 call ___tls_get_addr@PLT 5017 into: 5018 movl %gs:0, %eax 5019 nop 5020 leal 0(%esi,1), %esi 5021 or change 5022 leal foo@tlsldm(%reg) %eax 5023 call *___tls_get_addr@GOT(%reg) 5024 which may be converted to 5025 addr32 call ___tls_get_addr 5026 into: 5027 movl %gs:0, %eax 5028 leal 0(%esi), %esi */ 5029 BFD_ASSERT (r_type == R_386_TLS_LE_32); 5030 if (*(contents + rel->r_offset + 4) == 0xff 5031 || *(contents + rel->r_offset + 4) == 0x67) 5032 memcpy (contents + rel->r_offset - 2, 5033 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12); 5034 else 5035 memcpy (contents + rel->r_offset - 2, 5036 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); 5037 /* Skip R_386_PC32/R_386_PLT32. */ 5038 rel++; 5039 wrel++; 5040 continue; 5041 } 5042 5043 if (htab->elf.sgot == NULL) 5044 abort (); 5045 5046 off = htab->tls_ldm_got.offset; 5047 if (off & 1) 5048 off &= ~1; 5049 else 5050 { 5051 Elf_Internal_Rela outrel; 5052 5053 if (htab->elf.srelgot == NULL) 5054 abort (); 5055 5056 outrel.r_offset = (htab->elf.sgot->output_section->vma 5057 + htab->elf.sgot->output_offset + off); 5058 5059 bfd_put_32 (output_bfd, 0, 5060 htab->elf.sgot->contents + off); 5061 bfd_put_32 (output_bfd, 0, 5062 htab->elf.sgot->contents + off + 4); 5063 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); 5064 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel); 5065 htab->tls_ldm_got.offset |= 1; 5066 } 5067 relocation = htab->elf.sgot->output_section->vma 5068 + htab->elf.sgot->output_offset + off 5069 - htab->elf.sgotplt->output_section->vma 5070 - htab->elf.sgotplt->output_offset; 5071 unresolved_reloc = FALSE; 5072 break; 5073 5074 case R_386_TLS_LDO_32: 5075 if (!bfd_link_executable (info) 5076 || (input_section->flags & SEC_CODE) == 0) 5077 relocation -= elf_i386_dtpoff_base (info); 5078 else 5079 /* When converting LDO to LE, we must negate. */ 5080 relocation = -elf_i386_tpoff (info, relocation); 5081 break; 5082 5083 case R_386_TLS_LE_32: 5084 case R_386_TLS_LE: 5085 if (!bfd_link_executable (info)) 5086 { 5087 Elf_Internal_Rela outrel; 5088 asection *sreloc; 5089 5090 outrel.r_offset = rel->r_offset 5091 + input_section->output_section->vma 5092 + input_section->output_offset; 5093 if (h != NULL && h->dynindx != -1) 5094 indx = h->dynindx; 5095 else 5096 indx = 0; 5097 if (r_type == R_386_TLS_LE_32) 5098 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); 5099 else 5100 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 5101 sreloc = elf_section_data (input_section)->sreloc; 5102 if (sreloc == NULL) 5103 abort (); 5104 elf_append_rel (output_bfd, sreloc, &outrel); 5105 if (indx) 5106 continue; 5107 else if (r_type == R_386_TLS_LE_32) 5108 relocation = elf_i386_dtpoff_base (info) - relocation; 5109 else 5110 relocation -= elf_i386_dtpoff_base (info); 5111 } 5112 else if (r_type == R_386_TLS_LE_32) 5113 relocation = elf_i386_tpoff (info, relocation); 5114 else 5115 relocation = -elf_i386_tpoff (info, relocation); 5116 break; 5117 5118 default: 5119 break; 5120 } 5121 5122 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 5123 because such sections are not SEC_ALLOC and thus ld.so will 5124 not process them. */ 5125 if (unresolved_reloc 5126 && !((input_section->flags & SEC_DEBUGGING) != 0 5127 && h->def_dynamic) 5128 && _bfd_elf_section_offset (output_bfd, info, input_section, 5129 rel->r_offset) != (bfd_vma) -1) 5130 { 5131 (*_bfd_error_handler) 5132 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 5133 input_bfd, 5134 input_section, 5135 (long) rel->r_offset, 5136 howto->name, 5137 h->root.root.string); 5138 return FALSE; 5139 } 5140 5141do_relocation: 5142 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 5143 contents, rel->r_offset, 5144 relocation, 0); 5145 5146check_relocation_error: 5147 if (r != bfd_reloc_ok) 5148 { 5149 const char *name; 5150 5151 if (h != NULL) 5152 name = h->root.root.string; 5153 else 5154 { 5155 name = bfd_elf_string_from_elf_section (input_bfd, 5156 symtab_hdr->sh_link, 5157 sym->st_name); 5158 if (name == NULL) 5159 return FALSE; 5160 if (*name == '\0') 5161 name = bfd_section_name (input_bfd, sec); 5162 } 5163 5164 if (r == bfd_reloc_overflow) 5165 (*info->callbacks->reloc_overflow) 5166 (info, (h ? &h->root : NULL), name, howto->name, 5167 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 5168 else 5169 { 5170 (*_bfd_error_handler) 5171 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 5172 input_bfd, input_section, 5173 (long) rel->r_offset, name, (int) r); 5174 return FALSE; 5175 } 5176 } 5177 5178 if (wrel != rel) 5179 *wrel = *rel; 5180 } 5181 5182 if (wrel != rel) 5183 { 5184 Elf_Internal_Shdr *rel_hdr; 5185 size_t deleted = rel - wrel; 5186 5187 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); 5188 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; 5189 if (rel_hdr->sh_size == 0) 5190 { 5191 /* It is too late to remove an empty reloc section. Leave 5192 one NONE reloc. 5193 ??? What is wrong with an empty section??? */ 5194 rel_hdr->sh_size = rel_hdr->sh_entsize; 5195 deleted -= 1; 5196 } 5197 rel_hdr = _bfd_elf_single_rel_hdr (input_section); 5198 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; 5199 input_section->reloc_count -= deleted; 5200 } 5201 5202 return TRUE; 5203} 5204 5205/* Finish up dynamic symbol handling. We set the contents of various 5206 dynamic sections here. */ 5207 5208static bfd_boolean 5209elf_i386_finish_dynamic_symbol (bfd *output_bfd, 5210 struct bfd_link_info *info, 5211 struct elf_link_hash_entry *h, 5212 Elf_Internal_Sym *sym) 5213{ 5214 struct elf_i386_link_hash_table *htab; 5215 unsigned plt_entry_size; 5216 const struct elf_i386_backend_data *abed; 5217 struct elf_i386_link_hash_entry *eh; 5218 bfd_boolean local_undefweak; 5219 5220 htab = elf_i386_hash_table (info); 5221 if (htab == NULL) 5222 return FALSE; 5223 5224 abed = get_elf_i386_backend_data (output_bfd); 5225 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd); 5226 5227 eh = (struct elf_i386_link_hash_entry *) h; 5228 5229 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for 5230 resolved undefined weak symbols in executable so that their 5231 references have value 0 at run-time. */ 5232 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, 5233 eh->has_got_reloc, 5234 eh); 5235 5236 if (h->plt.offset != (bfd_vma) -1) 5237 { 5238 bfd_vma plt_index; 5239 bfd_vma got_offset; 5240 Elf_Internal_Rela rel; 5241 bfd_byte *loc; 5242 asection *plt, *gotplt, *relplt; 5243 5244 /* When building a static executable, use .iplt, .igot.plt and 5245 .rel.iplt sections for STT_GNU_IFUNC symbols. */ 5246 if (htab->elf.splt != NULL) 5247 { 5248 plt = htab->elf.splt; 5249 gotplt = htab->elf.sgotplt; 5250 relplt = htab->elf.srelplt; 5251 } 5252 else 5253 { 5254 plt = htab->elf.iplt; 5255 gotplt = htab->elf.igotplt; 5256 relplt = htab->elf.irelplt; 5257 } 5258 5259 /* This symbol has an entry in the procedure linkage table. Set 5260 it up. */ 5261 5262 if ((h->dynindx == -1 5263 && !local_undefweak 5264 && !((h->forced_local || bfd_link_executable (info)) 5265 && h->def_regular 5266 && h->type == STT_GNU_IFUNC)) 5267 || plt == NULL 5268 || gotplt == NULL 5269 || relplt == NULL) 5270 abort (); 5271 5272 /* Get the index in the procedure linkage table which 5273 corresponds to this symbol. This is the index of this symbol 5274 in all the symbols for which we are making plt entries. The 5275 first entry in the procedure linkage table is reserved. 5276 5277 Get the offset into the .got table of the entry that 5278 corresponds to this function. Each .got entry is 4 bytes. 5279 The first three are reserved. 5280 5281 For static executables, we don't reserve anything. */ 5282 5283 if (plt == htab->elf.splt) 5284 { 5285 got_offset = h->plt.offset / plt_entry_size - 1; 5286 got_offset = (got_offset + 3) * 4; 5287 } 5288 else 5289 { 5290 got_offset = h->plt.offset / plt_entry_size; 5291 got_offset = got_offset * 4; 5292 } 5293 5294 /* Fill in the entry in the procedure linkage table. */ 5295 if (! bfd_link_pic (info)) 5296 { 5297 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry, 5298 abed->plt->plt_entry_size); 5299 bfd_put_32 (output_bfd, 5300 (gotplt->output_section->vma 5301 + gotplt->output_offset 5302 + got_offset), 5303 plt->contents + h->plt.offset 5304 + abed->plt->plt_got_offset); 5305 5306 if (abed->is_vxworks) 5307 { 5308 int s, k, reloc_index; 5309 5310 /* Create the R_386_32 relocation referencing the GOT 5311 for this PLT entry. */ 5312 5313 /* S: Current slot number (zero-based). */ 5314 s = ((h->plt.offset - abed->plt->plt_entry_size) 5315 / abed->plt->plt_entry_size); 5316 /* K: Number of relocations for PLTResolve. */ 5317 if (bfd_link_pic (info)) 5318 k = PLTRESOLVE_RELOCS_SHLIB; 5319 else 5320 k = PLTRESOLVE_RELOCS; 5321 /* Skip the PLTresolve relocations, and the relocations for 5322 the other PLT slots. */ 5323 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS; 5324 loc = (htab->srelplt2->contents + reloc_index 5325 * sizeof (Elf32_External_Rel)); 5326 5327 rel.r_offset = (htab->elf.splt->output_section->vma 5328 + htab->elf.splt->output_offset 5329 + h->plt.offset + 2), 5330 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 5331 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 5332 5333 /* Create the R_386_32 relocation referencing the beginning of 5334 the PLT for this GOT entry. */ 5335 rel.r_offset = (htab->elf.sgotplt->output_section->vma 5336 + htab->elf.sgotplt->output_offset 5337 + got_offset); 5338 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); 5339 bfd_elf32_swap_reloc_out (output_bfd, &rel, 5340 loc + sizeof (Elf32_External_Rel)); 5341 } 5342 } 5343 else 5344 { 5345 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry, 5346 abed->plt->plt_entry_size); 5347 bfd_put_32 (output_bfd, got_offset, 5348 plt->contents + h->plt.offset 5349 + abed->plt->plt_got_offset); 5350 } 5351 5352 /* Fill in the entry in the global offset table. Leave the entry 5353 as zero for undefined weak symbol in PIE. No PLT relocation 5354 against undefined weak symbol in PIE. */ 5355 if (!local_undefweak) 5356 { 5357 bfd_put_32 (output_bfd, 5358 (plt->output_section->vma 5359 + plt->output_offset 5360 + h->plt.offset 5361 + abed->plt->plt_lazy_offset), 5362 gotplt->contents + got_offset); 5363 5364 /* Fill in the entry in the .rel.plt section. */ 5365 rel.r_offset = (gotplt->output_section->vma 5366 + gotplt->output_offset 5367 + got_offset); 5368 if (h->dynindx == -1 5369 || ((bfd_link_executable (info) 5370 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 5371 && h->def_regular 5372 && h->type == STT_GNU_IFUNC)) 5373 { 5374 /* If an STT_GNU_IFUNC symbol is locally defined, generate 5375 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend 5376 in the .got.plt section. */ 5377 bfd_put_32 (output_bfd, 5378 (h->root.u.def.value 5379 + h->root.u.def.section->output_section->vma 5380 + h->root.u.def.section->output_offset), 5381 gotplt->contents + got_offset); 5382 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); 5383 /* R_386_IRELATIVE comes last. */ 5384 plt_index = htab->next_irelative_index--; 5385 } 5386 else 5387 { 5388 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); 5389 plt_index = htab->next_jump_slot_index++; 5390 } 5391 5392 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel); 5393 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 5394 5395 /* Don't fill PLT entry for static executables. */ 5396 if (plt == htab->elf.splt) 5397 { 5398 bfd_put_32 (output_bfd, 5399 plt_index * sizeof (Elf32_External_Rel), 5400 plt->contents + h->plt.offset 5401 + abed->plt->plt_reloc_offset); 5402 bfd_put_32 (output_bfd, - (h->plt.offset 5403 + abed->plt->plt_plt_offset + 4), 5404 plt->contents + h->plt.offset 5405 + abed->plt->plt_plt_offset); 5406 } 5407 } 5408 } 5409 else if (eh->plt_got.offset != (bfd_vma) -1) 5410 { 5411 bfd_vma got_offset, plt_offset; 5412 asection *plt, *got, *gotplt; 5413 const bfd_byte *got_plt_entry; 5414 5415 /* Offset of displacement of the indirect jump. */ 5416 bfd_vma plt_got_offset = 2; 5417 5418 /* Set the entry in the GOT procedure linkage table. */ 5419 plt = htab->plt_got; 5420 got = htab->elf.sgot; 5421 gotplt = htab->elf.sgotplt; 5422 got_offset = h->got.offset; 5423 5424 if (got_offset == (bfd_vma) -1 5425 || plt == NULL 5426 || got == NULL 5427 || gotplt == NULL) 5428 abort (); 5429 5430 /* Fill in the entry in the GOT procedure linkage table. */ 5431 if (! bfd_link_pic (info)) 5432 { 5433 got_plt_entry = elf_i386_got_plt_entry; 5434 got_offset += got->output_section->vma + got->output_offset; 5435 } 5436 else 5437 { 5438 got_plt_entry = elf_i386_pic_got_plt_entry; 5439 got_offset += (got->output_section->vma 5440 + got->output_offset 5441 - gotplt->output_section->vma 5442 - gotplt->output_offset); 5443 } 5444 5445 plt_offset = eh->plt_got.offset; 5446 memcpy (plt->contents + plt_offset, got_plt_entry, 5447 sizeof (elf_i386_got_plt_entry)); 5448 bfd_put_32 (output_bfd, got_offset, 5449 plt->contents + plt_offset + plt_got_offset); 5450 } 5451 5452 if (!local_undefweak 5453 && !h->def_regular 5454 && (h->plt.offset != (bfd_vma) -1 5455 || eh->plt_got.offset != (bfd_vma) -1)) 5456 { 5457 /* Mark the symbol as undefined, rather than as defined in 5458 the .plt section. Leave the value if there were any 5459 relocations where pointer equality matters (this is a clue 5460 for the dynamic linker, to make function pointer 5461 comparisons work between an application and shared 5462 library), otherwise set it to zero. If a function is only 5463 called from a binary, there is no need to slow down 5464 shared libraries because of that. */ 5465 sym->st_shndx = SHN_UNDEF; 5466 if (!h->pointer_equality_needed) 5467 sym->st_value = 0; 5468 } 5469 5470 /* Don't generate dynamic GOT relocation against undefined weak 5471 symbol in executable. */ 5472 if (h->got.offset != (bfd_vma) -1 5473 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type) 5474 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0 5475 && !local_undefweak) 5476 { 5477 Elf_Internal_Rela rel; 5478 asection *relgot = htab->elf.srelgot; 5479 5480 /* This symbol has an entry in the global offset table. Set it 5481 up. */ 5482 5483 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) 5484 abort (); 5485 5486 rel.r_offset = (htab->elf.sgot->output_section->vma 5487 + htab->elf.sgot->output_offset 5488 + (h->got.offset & ~(bfd_vma) 1)); 5489 5490 /* If this is a static link, or it is a -Bsymbolic link and the 5491 symbol is defined locally or was forced to be local because 5492 of a version file, we just want to emit a RELATIVE reloc. 5493 The entry in the global offset table will already have been 5494 initialized in the relocate_section function. */ 5495 if (h->def_regular 5496 && h->type == STT_GNU_IFUNC) 5497 { 5498 if (h->plt.offset == (bfd_vma) -1) 5499 { 5500 /* STT_GNU_IFUNC is referenced without PLT. */ 5501 if (htab->elf.splt == NULL) 5502 { 5503 /* use .rel[a].iplt section to store .got relocations 5504 in static executable. */ 5505 relgot = htab->elf.irelplt; 5506 } 5507 if (SYMBOL_REFERENCES_LOCAL (info, h)) 5508 { 5509 bfd_put_32 (output_bfd, 5510 (h->root.u.def.value 5511 + h->root.u.def.section->output_section->vma 5512 + h->root.u.def.section->output_offset), 5513 htab->elf.sgot->contents + h->got.offset); 5514 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); 5515 } 5516 else 5517 goto do_glob_dat; 5518 } 5519 else if (bfd_link_pic (info)) 5520 { 5521 /* Generate R_386_GLOB_DAT. */ 5522 goto do_glob_dat; 5523 } 5524 else 5525 { 5526 asection *plt; 5527 5528 if (!h->pointer_equality_needed) 5529 abort (); 5530 5531 /* For non-shared object, we can't use .got.plt, which 5532 contains the real function addres if we need pointer 5533 equality. We load the GOT entry with the PLT entry. */ 5534 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; 5535 bfd_put_32 (output_bfd, 5536 (plt->output_section->vma 5537 + plt->output_offset + h->plt.offset), 5538 htab->elf.sgot->contents + h->got.offset); 5539 return TRUE; 5540 } 5541 } 5542 else if (bfd_link_pic (info) 5543 && SYMBOL_REFERENCES_LOCAL (info, h)) 5544 { 5545 BFD_ASSERT((h->got.offset & 1) != 0); 5546 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 5547 } 5548 else 5549 { 5550 BFD_ASSERT((h->got.offset & 1) == 0); 5551do_glob_dat: 5552 bfd_put_32 (output_bfd, (bfd_vma) 0, 5553 htab->elf.sgot->contents + h->got.offset); 5554 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); 5555 } 5556 5557 elf_append_rel (output_bfd, relgot, &rel); 5558 } 5559 5560 if (h->needs_copy) 5561 { 5562 Elf_Internal_Rela rel; 5563 5564 /* This symbol needs a copy reloc. Set it up. */ 5565 5566 if (h->dynindx == -1 5567 || (h->root.type != bfd_link_hash_defined 5568 && h->root.type != bfd_link_hash_defweak) 5569 || htab->srelbss == NULL) 5570 abort (); 5571 5572 rel.r_offset = (h->root.u.def.value 5573 + h->root.u.def.section->output_section->vma 5574 + h->root.u.def.section->output_offset); 5575 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); 5576 elf_append_rel (output_bfd, htab->srelbss, &rel); 5577 } 5578 5579 return TRUE; 5580} 5581 5582/* Finish up local dynamic symbol handling. We set the contents of 5583 various dynamic sections here. */ 5584 5585static bfd_boolean 5586elf_i386_finish_local_dynamic_symbol (void **slot, void *inf) 5587{ 5588 struct elf_link_hash_entry *h 5589 = (struct elf_link_hash_entry *) *slot; 5590 struct bfd_link_info *info 5591 = (struct bfd_link_info *) inf; 5592 5593 return elf_i386_finish_dynamic_symbol (info->output_bfd, info, 5594 h, NULL); 5595} 5596 5597/* Finish up undefined weak symbol handling in PIE. Fill its PLT entry 5598 here since undefined weak symbol may not be dynamic and may not be 5599 called for elf_i386_finish_dynamic_symbol. */ 5600 5601static bfd_boolean 5602elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh, 5603 void *inf) 5604{ 5605 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh; 5606 struct bfd_link_info *info = (struct bfd_link_info *) inf; 5607 5608 if (h->root.type != bfd_link_hash_undefweak 5609 || h->dynindx != -1) 5610 return TRUE; 5611 5612 return elf_i386_finish_dynamic_symbol (info->output_bfd, 5613 info, h, NULL); 5614} 5615 5616/* Used to decide how to sort relocs in an optimal manner for the 5617 dynamic linker, before writing them out. */ 5618 5619static enum elf_reloc_type_class 5620elf_i386_reloc_type_class (const struct bfd_link_info *info, 5621 const asection *rel_sec ATTRIBUTE_UNUSED, 5622 const Elf_Internal_Rela *rela) 5623{ 5624 bfd *abfd = info->output_bfd; 5625 const struct elf_backend_data *bed = get_elf_backend_data (abfd); 5626 struct elf_link_hash_table *htab = elf_hash_table (info); 5627 5628 if (htab->dynsym != NULL 5629 && htab->dynsym->contents != NULL) 5630 { 5631 /* Check relocation against STT_GNU_IFUNC symbol if there are 5632 dynamic symbols. */ 5633 unsigned long r_symndx = ELF32_R_SYM (rela->r_info); 5634 if (r_symndx != STN_UNDEF) 5635 { 5636 Elf_Internal_Sym sym; 5637 if (!bed->s->swap_symbol_in (abfd, 5638 (htab->dynsym->contents 5639 + r_symndx * sizeof (Elf32_External_Sym)), 5640 0, &sym)) 5641 abort (); 5642 5643 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) 5644 return reloc_class_ifunc; 5645 } 5646 } 5647 5648 switch (ELF32_R_TYPE (rela->r_info)) 5649 { 5650 case R_386_IRELATIVE: 5651 return reloc_class_ifunc; 5652 case R_386_RELATIVE: 5653 return reloc_class_relative; 5654 case R_386_JUMP_SLOT: 5655 return reloc_class_plt; 5656 case R_386_COPY: 5657 return reloc_class_copy; 5658 default: 5659 return reloc_class_normal; 5660 } 5661} 5662 5663/* Finish up the dynamic sections. */ 5664 5665static bfd_boolean 5666elf_i386_finish_dynamic_sections (bfd *output_bfd, 5667 struct bfd_link_info *info) 5668{ 5669 struct elf_i386_link_hash_table *htab; 5670 bfd *dynobj; 5671 asection *sdyn; 5672 const struct elf_i386_backend_data *abed; 5673 5674 htab = elf_i386_hash_table (info); 5675 if (htab == NULL) 5676 return FALSE; 5677 5678 dynobj = htab->elf.dynobj; 5679 sdyn = bfd_get_linker_section (dynobj, ".dynamic"); 5680 abed = get_elf_i386_backend_data (output_bfd); 5681 5682 if (htab->elf.dynamic_sections_created) 5683 { 5684 Elf32_External_Dyn *dyncon, *dynconend; 5685 5686 if (sdyn == NULL || htab->elf.sgot == NULL) 5687 abort (); 5688 5689 dyncon = (Elf32_External_Dyn *) sdyn->contents; 5690 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 5691 for (; dyncon < dynconend; dyncon++) 5692 { 5693 Elf_Internal_Dyn dyn; 5694 asection *s; 5695 5696 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 5697 5698 switch (dyn.d_tag) 5699 { 5700 default: 5701 if (abed->is_vxworks 5702 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn)) 5703 break; 5704 continue; 5705 5706 case DT_PLTGOT: 5707 s = htab->elf.sgotplt; 5708 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 5709 break; 5710 5711 case DT_JMPREL: 5712 s = htab->elf.srelplt; 5713 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 5714 break; 5715 5716 case DT_PLTRELSZ: 5717 s = htab->elf.srelplt; 5718 dyn.d_un.d_val = s->size; 5719 break; 5720 5721 case DT_RELSZ: 5722 /* My reading of the SVR4 ABI indicates that the 5723 procedure linkage table relocs (DT_JMPREL) should be 5724 included in the overall relocs (DT_REL). This is 5725 what Solaris does. However, UnixWare can not handle 5726 that case. Therefore, we override the DT_RELSZ entry 5727 here to make it not include the JMPREL relocs. */ 5728 s = htab->elf.srelplt; 5729 if (s == NULL) 5730 continue; 5731 dyn.d_un.d_val -= s->size; 5732 break; 5733 5734 case DT_REL: 5735 /* We may not be using the standard ELF linker script. 5736 If .rel.plt is the first .rel section, we adjust 5737 DT_REL to not include it. */ 5738 s = htab->elf.srelplt; 5739 if (s == NULL) 5740 continue; 5741 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) 5742 continue; 5743 dyn.d_un.d_ptr += s->size; 5744 break; 5745 } 5746 5747 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 5748 } 5749 5750 /* Fill in the first entry in the procedure linkage table. */ 5751 if (htab->elf.splt && htab->elf.splt->size > 0) 5752 { 5753 if (bfd_link_pic (info)) 5754 { 5755 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry, 5756 abed->plt->plt0_entry_size); 5757 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size, 5758 abed->plt0_pad_byte, 5759 abed->plt->plt_entry_size - abed->plt->plt0_entry_size); 5760 } 5761 else 5762 { 5763 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry, 5764 abed->plt->plt0_entry_size); 5765 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size, 5766 abed->plt0_pad_byte, 5767 abed->plt->plt_entry_size - abed->plt->plt0_entry_size); 5768 bfd_put_32 (output_bfd, 5769 (htab->elf.sgotplt->output_section->vma 5770 + htab->elf.sgotplt->output_offset 5771 + 4), 5772 htab->elf.splt->contents 5773 + abed->plt->plt0_got1_offset); 5774 bfd_put_32 (output_bfd, 5775 (htab->elf.sgotplt->output_section->vma 5776 + htab->elf.sgotplt->output_offset 5777 + 8), 5778 htab->elf.splt->contents 5779 + abed->plt->plt0_got2_offset); 5780 5781 if (abed->is_vxworks) 5782 { 5783 Elf_Internal_Rela rel; 5784 5785 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4. 5786 On IA32 we use REL relocations so the addend goes in 5787 the PLT directly. */ 5788 rel.r_offset = (htab->elf.splt->output_section->vma 5789 + htab->elf.splt->output_offset 5790 + abed->plt->plt0_got1_offset); 5791 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 5792 bfd_elf32_swap_reloc_out (output_bfd, &rel, 5793 htab->srelplt2->contents); 5794 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ 5795 rel.r_offset = (htab->elf.splt->output_section->vma 5796 + htab->elf.splt->output_offset 5797 + abed->plt->plt0_got2_offset); 5798 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 5799 bfd_elf32_swap_reloc_out (output_bfd, &rel, 5800 htab->srelplt2->contents + 5801 sizeof (Elf32_External_Rel)); 5802 } 5803 } 5804 5805 /* UnixWare sets the entsize of .plt to 4, although that doesn't 5806 really seem like the right value. */ 5807 elf_section_data (htab->elf.splt->output_section) 5808 ->this_hdr.sh_entsize = 4; 5809 5810 /* Correct the .rel.plt.unloaded relocations. */ 5811 if (abed->is_vxworks && !bfd_link_pic (info)) 5812 { 5813 int num_plts = (htab->elf.splt->size 5814 / abed->plt->plt_entry_size) - 1; 5815 unsigned char *p; 5816 5817 p = htab->srelplt2->contents; 5818 if (bfd_link_pic (info)) 5819 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel); 5820 else 5821 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel); 5822 5823 for (; num_plts; num_plts--) 5824 { 5825 Elf_Internal_Rela rel; 5826 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 5827 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 5828 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 5829 p += sizeof (Elf32_External_Rel); 5830 5831 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 5832 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); 5833 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 5834 p += sizeof (Elf32_External_Rel); 5835 } 5836 } 5837 } 5838 } 5839 5840 if (htab->elf.sgotplt) 5841 { 5842 if (bfd_is_abs_section (htab->elf.sgotplt->output_section)) 5843 { 5844 (*_bfd_error_handler) 5845 (_("discarded output section: `%A'"), htab->elf.sgotplt); 5846 return FALSE; 5847 } 5848 5849 /* Fill in the first three entries in the global offset table. */ 5850 if (htab->elf.sgotplt->size > 0) 5851 { 5852 bfd_put_32 (output_bfd, 5853 (sdyn == NULL ? 0 5854 : sdyn->output_section->vma + sdyn->output_offset), 5855 htab->elf.sgotplt->contents); 5856 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4); 5857 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8); 5858 } 5859 5860 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4; 5861 } 5862 5863 /* Adjust .eh_frame for .plt section. */ 5864 if (htab->plt_eh_frame != NULL 5865 && htab->plt_eh_frame->contents != NULL) 5866 { 5867 if (htab->elf.splt != NULL 5868 && htab->elf.splt->size != 0 5869 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0 5870 && htab->elf.splt->output_section != NULL 5871 && htab->plt_eh_frame->output_section != NULL) 5872 { 5873 bfd_vma plt_start = htab->elf.splt->output_section->vma; 5874 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma 5875 + htab->plt_eh_frame->output_offset 5876 + PLT_FDE_START_OFFSET; 5877 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start, 5878 htab->plt_eh_frame->contents 5879 + PLT_FDE_START_OFFSET); 5880 } 5881 if (htab->plt_eh_frame->sec_info_type 5882 == SEC_INFO_TYPE_EH_FRAME) 5883 { 5884 if (! _bfd_elf_write_section_eh_frame (output_bfd, info, 5885 htab->plt_eh_frame, 5886 htab->plt_eh_frame->contents)) 5887 return FALSE; 5888 } 5889 } 5890 5891 if (htab->elf.sgot && htab->elf.sgot->size > 0) 5892 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4; 5893 5894 /* Fill PLT entries for undefined weak symbols in PIE. */ 5895 if (bfd_link_pie (info)) 5896 bfd_hash_traverse (&info->hash->table, 5897 elf_i386_pie_finish_undefweak_symbol, 5898 info); 5899 5900 return TRUE; 5901} 5902 5903/* Fill PLT/GOT entries and allocate dynamic relocations for local 5904 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table. 5905 It has to be done before elf_link_sort_relocs is called so that 5906 dynamic relocations are properly sorted. */ 5907 5908static bfd_boolean 5909elf_i386_output_arch_local_syms 5910 (bfd *output_bfd ATTRIBUTE_UNUSED, 5911 struct bfd_link_info *info, 5912 void *flaginfo ATTRIBUTE_UNUSED, 5913 int (*func) (void *, const char *, 5914 Elf_Internal_Sym *, 5915 asection *, 5916 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED) 5917{ 5918 struct elf_i386_link_hash_table *htab = elf_i386_hash_table (info); 5919 if (htab == NULL) 5920 return FALSE; 5921 5922 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ 5923 htab_traverse (htab->loc_hash_table, 5924 elf_i386_finish_local_dynamic_symbol, 5925 info); 5926 5927 return TRUE; 5928} 5929 5930/* Return an array of PLT entry symbol values. */ 5931 5932static bfd_vma * 5933elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt, 5934 asection *relplt) 5935{ 5936 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean); 5937 arelent *p; 5938 long count, i; 5939 bfd_vma *plt_sym_val; 5940 bfd_vma plt_offset; 5941 bfd_byte *plt_contents; 5942 const struct elf_i386_backend_data *bed 5943 = get_elf_i386_backend_data (abfd); 5944 Elf_Internal_Shdr *hdr; 5945 5946 /* Get the .plt section contents. */ 5947 plt_contents = (bfd_byte *) bfd_malloc (plt->size); 5948 if (plt_contents == NULL) 5949 return NULL; 5950 if (!bfd_get_section_contents (abfd, (asection *) plt, 5951 plt_contents, 0, plt->size)) 5952 { 5953bad_return: 5954 free (plt_contents); 5955 return NULL; 5956 } 5957 5958 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table; 5959 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE)) 5960 goto bad_return; 5961 5962 hdr = &elf_section_data (relplt)->this_hdr; 5963 count = relplt->size / hdr->sh_entsize; 5964 5965 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count); 5966 if (plt_sym_val == NULL) 5967 goto bad_return; 5968 5969 for (i = 0; i < count; i++) 5970 plt_sym_val[i] = -1; 5971 5972 plt_offset = bed->plt->plt_entry_size; 5973 p = relplt->relocation; 5974 for (i = 0; i < count; i++, p++) 5975 { 5976 long reloc_index; 5977 5978 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */ 5979 if (p->howto == NULL) 5980 continue; 5981 5982 if (p->howto->type != R_386_JUMP_SLOT 5983 && p->howto->type != R_386_IRELATIVE) 5984 continue; 5985 5986 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset 5987 + bed->plt->plt_reloc_offset)); 5988 reloc_index /= sizeof (Elf32_External_Rel); 5989 if (reloc_index < count) 5990 plt_sym_val[reloc_index] = plt->vma + plt_offset; 5991 5992 plt_offset += bed->plt->plt_entry_size; 5993 5994 /* PR binutils/18437: Skip extra relocations in the .rel.plt 5995 section. */ 5996 if (plt_offset >= plt->size) 5997 break; 5998 } 5999 6000 free (plt_contents); 6001 6002 return plt_sym_val; 6003} 6004 6005/* Similar to _bfd_elf_get_synthetic_symtab. */ 6006 6007static long 6008elf_i386_get_synthetic_symtab (bfd *abfd, 6009 long symcount, 6010 asymbol **syms, 6011 long dynsymcount, 6012 asymbol **dynsyms, 6013 asymbol **ret) 6014{ 6015 asection *plt = bfd_get_section_by_name (abfd, ".plt"); 6016 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms, 6017 dynsymcount, dynsyms, ret, 6018 plt, 6019 elf_i386_get_plt_sym_val); 6020} 6021 6022/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 6023 6024static bfd_boolean 6025elf_i386_hash_symbol (struct elf_link_hash_entry *h) 6026{ 6027 if (h->plt.offset != (bfd_vma) -1 6028 && !h->def_regular 6029 && !h->pointer_equality_needed) 6030 return FALSE; 6031 6032 return _bfd_elf_hash_symbol (h); 6033} 6034 6035#define TARGET_LITTLE_SYM i386_elf32_vec 6036#define TARGET_LITTLE_NAME "elf32-i386" 6037#define ELF_ARCH bfd_arch_i386 6038#define ELF_TARGET_ID I386_ELF_DATA 6039#define ELF_MACHINE_CODE EM_386 6040#define ELF_MAXPAGESIZE 0x1000 6041 6042#define elf_backend_can_gc_sections 1 6043#define elf_backend_can_refcount 1 6044#define elf_backend_want_got_plt 1 6045#define elf_backend_plt_readonly 1 6046#define elf_backend_want_plt_sym 0 6047#define elf_backend_got_header_size 12 6048#define elf_backend_plt_alignment 4 6049#define elf_backend_extern_protected_data 1 6050#define elf_backend_caches_rawsize 1 6051 6052/* Support RELA for objdump of prelink objects. */ 6053#define elf_info_to_howto elf_i386_info_to_howto_rel 6054#define elf_info_to_howto_rel elf_i386_info_to_howto_rel 6055 6056#define bfd_elf32_mkobject elf_i386_mkobject 6057 6058#define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name 6059#define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create 6060#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup 6061#define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup 6062#define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab 6063 6064#define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol 6065#define elf_backend_relocs_compatible _bfd_elf_relocs_compatible 6066#define elf_backend_check_relocs elf_i386_check_relocs 6067#define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol 6068#define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections 6069#define elf_backend_fake_sections elf_i386_fake_sections 6070#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections 6071#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol 6072#define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms 6073#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook 6074#define elf_backend_grok_prstatus elf_i386_grok_prstatus 6075#define elf_backend_grok_psinfo elf_i386_grok_psinfo 6076#define elf_backend_reloc_type_class elf_i386_reloc_type_class 6077#define elf_backend_relocate_section elf_i386_relocate_section 6078#define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections 6079#define elf_backend_always_size_sections elf_i386_always_size_sections 6080#define elf_backend_omit_section_dynsym \ 6081 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 6082#define elf_backend_hash_symbol elf_i386_hash_symbol 6083#define elf_backend_fixup_symbol elf_i386_fixup_symbol 6084 6085#include "elf32-target.h" 6086 6087/* FreeBSD support. */ 6088 6089#undef TARGET_LITTLE_SYM 6090#define TARGET_LITTLE_SYM i386_elf32_fbsd_vec 6091#undef TARGET_LITTLE_NAME 6092#define TARGET_LITTLE_NAME "elf32-i386-freebsd" 6093#undef ELF_OSABI 6094#define ELF_OSABI ELFOSABI_FREEBSD 6095 6096/* The kernel recognizes executables as valid only if they carry a 6097 "FreeBSD" label in the ELF header. So we put this label on all 6098 executables and (for simplicity) also all other object files. */ 6099 6100static void 6101elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info) 6102{ 6103 _bfd_elf_post_process_headers (abfd, info); 6104 6105#ifdef OLD_FREEBSD_ABI_LABEL 6106 { 6107 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ 6108 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd); 6109 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); 6110 } 6111#endif 6112} 6113 6114#undef elf_backend_post_process_headers 6115#define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers 6116#undef elf32_bed 6117#define elf32_bed elf32_i386_fbsd_bed 6118 6119#undef elf_backend_add_symbol_hook 6120 6121#include "elf32-target.h" 6122 6123/* Solaris 2. */ 6124 6125#undef TARGET_LITTLE_SYM 6126#define TARGET_LITTLE_SYM i386_elf32_sol2_vec 6127#undef TARGET_LITTLE_NAME 6128#define TARGET_LITTLE_NAME "elf32-i386-sol2" 6129 6130#undef elf_backend_post_process_headers 6131 6132/* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE 6133 objects won't be recognized. */ 6134#undef ELF_OSABI 6135 6136#undef elf32_bed 6137#define elf32_bed elf32_i386_sol2_bed 6138 6139/* The 32-bit static TLS arena size is rounded to the nearest 8-byte 6140 boundary. */ 6141#undef elf_backend_static_tls_alignment 6142#define elf_backend_static_tls_alignment 8 6143 6144/* The Solaris 2 ABI requires a plt symbol on all platforms. 6145 6146 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output 6147 File, p.63. */ 6148#undef elf_backend_want_plt_sym 6149#define elf_backend_want_plt_sym 1 6150 6151#undef elf_backend_strtab_flags 6152#define elf_backend_strtab_flags SHF_STRINGS 6153 6154/* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which 6155 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised 6156 FALSE otherwise. ISECTION is the best guess matching section from the 6157 input bfd IBFD, but it might be NULL. */ 6158 6159static bfd_boolean 6160elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED, 6161 bfd *obfd ATTRIBUTE_UNUSED, 6162 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED, 6163 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED) 6164{ 6165 /* PR 19938: FIXME: Need to add code for setting the sh_info 6166 and sh_link fields of Solaris specific section types. */ 6167 return FALSE; 6168 6169 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13, 6170 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation: 6171 6172http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc 6173 6174 The following values should be set: 6175 6176Type Link Info 6177----------------------------------------------------------------------------- 6178SHT_SUNW_ancillary The section header index of 0 6179 [0x6fffffee] the associated string table. 6180 6181SHT_SUNW_capinfo The section header index of For a dynamic object, the 6182 [0x6ffffff0] the associated symbol table. section header index of 6183 the associated 6184 SHT_SUNW_capchain table, 6185 otherwise 0. 6186 6187SHT_SUNW_symsort The section header index of 0 6188 [0x6ffffff1] the associated symbol table. 6189 6190SHT_SUNW_tlssort The section header index of 0 6191 [0x6ffffff2] the associated symbol table. 6192 6193SHT_SUNW_LDYNSYM The section header index of One greater than the 6194 [0x6ffffff3] the associated string table. symbol table index of the 6195 This index is the same string last local symbol, 6196 table used by the SHT_DYNSYM STB_LOCAL. Since 6197 section. SHT_SUNW_LDYNSYM only 6198 contains local symbols, 6199 sh_info is equivalent to 6200 the number of symbols in 6201 the table. 6202 6203SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer 6204 [0x6ffffff5] the section header index of to named strings, the 6205 the associated section header index of 6206 SHT_SUNW_capinfo table, the associated string 6207 otherwise 0. table, otherwise 0. 6208 6209SHT_SUNW_move The section header index of 0 6210 [0x6ffffffa] the associated symbol table. 6211 6212SHT_SUNW_COMDAT 0 0 6213 [0x6ffffffb] 6214 6215SHT_SUNW_syminfo The section header index of The section header index 6216 [0x6ffffffc] the associated symbol table. of the associated 6217 .dynamic section. 6218 6219SHT_SUNW_verdef The section header index of The number of version 6220 [0x6ffffffd] the associated string table. definitions within the 6221 section. 6222 6223SHT_SUNW_verneed The section header index of The number of version 6224 [0x6ffffffe] the associated string table. dependencies within the 6225 section. 6226 6227SHT_SUNW_versym The section header index of 0 6228 [0x6fffffff] the associated symbol table. */ 6229} 6230 6231#undef elf_backend_copy_special_section_fields 6232#define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields 6233 6234#include "elf32-target.h" 6235 6236/* Intel MCU support. */ 6237 6238static bfd_boolean 6239elf32_iamcu_elf_object_p (bfd *abfd) 6240{ 6241 /* Set the right machine number for an IAMCU elf32 file. */ 6242 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu); 6243 return TRUE; 6244} 6245 6246#undef TARGET_LITTLE_SYM 6247#define TARGET_LITTLE_SYM iamcu_elf32_vec 6248#undef TARGET_LITTLE_NAME 6249#define TARGET_LITTLE_NAME "elf32-iamcu" 6250#undef ELF_ARCH 6251#define ELF_ARCH bfd_arch_iamcu 6252 6253#undef ELF_MACHINE_CODE 6254#define ELF_MACHINE_CODE EM_IAMCU 6255 6256#undef ELF_OSABI 6257 6258#undef elf32_bed 6259#define elf32_bed elf32_iamcu_bed 6260 6261#undef elf_backend_object_p 6262#define elf_backend_object_p elf32_iamcu_elf_object_p 6263 6264#undef elf_backend_static_tls_alignment 6265 6266#undef elf_backend_want_plt_sym 6267#define elf_backend_want_plt_sym 0 6268 6269#undef elf_backend_strtab_flags 6270#undef elf_backend_copy_special_section_fields 6271 6272#include "elf32-target.h" 6273 6274/* Restore defaults. */ 6275#undef ELF_ARCH 6276#define ELF_ARCH bfd_arch_i386 6277#undef ELF_MACHINE_CODE 6278#define ELF_MACHINE_CODE EM_386 6279 6280/* Native Client support. */ 6281 6282#undef TARGET_LITTLE_SYM 6283#define TARGET_LITTLE_SYM i386_elf32_nacl_vec 6284#undef TARGET_LITTLE_NAME 6285#define TARGET_LITTLE_NAME "elf32-i386-nacl" 6286#undef elf32_bed 6287#define elf32_bed elf32_i386_nacl_bed 6288 6289#undef ELF_MAXPAGESIZE 6290#define ELF_MAXPAGESIZE 0x10000 6291 6292/* Restore defaults. */ 6293#undef ELF_OSABI 6294#undef elf_backend_want_plt_sym 6295#define elf_backend_want_plt_sym 0 6296#undef elf_backend_post_process_headers 6297#undef elf_backend_static_tls_alignment 6298 6299/* NaCl uses substantially different PLT entries for the same effects. */ 6300 6301#undef elf_backend_plt_alignment 6302#define elf_backend_plt_alignment 5 6303#define NACL_PLT_ENTRY_SIZE 64 6304#define NACLMASK 0xe0 /* 32-byte alignment mask. */ 6305 6306static const bfd_byte elf_i386_nacl_plt0_entry[] = 6307 { 6308 0xff, 0x35, /* pushl contents of address */ 6309 0, 0, 0, 0, /* replaced with address of .got + 4. */ 6310 0x8b, 0x0d, /* movl contents of address, %ecx */ 6311 0, 0, 0, 0, /* replaced with address of .got + 8. */ 6312 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */ 6313 0xff, 0xe1 /* jmp *%ecx */ 6314 }; 6315 6316static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] = 6317 { 6318 0x8b, 0x0d, /* movl contents of address, %ecx */ 6319 0, 0, 0, 0, /* replaced with GOT slot address. */ 6320 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */ 6321 0xff, 0xe1, /* jmp *%ecx */ 6322 6323 /* Pad to the next 32-byte boundary with nop instructions. */ 6324 0x90, 6325 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 6326 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 6327 6328 /* Lazy GOT entries point here (32-byte aligned). */ 6329 0x68, /* pushl immediate */ 6330 0, 0, 0, 0, /* replaced with reloc offset. */ 6331 0xe9, /* jmp relative */ 6332 0, 0, 0, 0, /* replaced with offset to .plt. */ 6333 6334 /* Pad to the next 32-byte boundary with nop instructions. */ 6335 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 6336 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 6337 0x90, 0x90 6338 }; 6339 6340static const bfd_byte 6341elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] = 6342 { 6343 0xff, 0x73, 0x04, /* pushl 4(%ebx) */ 6344 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */ 6345 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */ 6346 0xff, 0xe1, /* jmp *%ecx */ 6347 6348 /* This is expected to be the same size as elf_i386_nacl_plt0_entry, 6349 so pad to that size with nop instructions. */ 6350 0x90, 0x90, 0x90, 0x90, 0x90, 0x90 6351 }; 6352 6353static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] = 6354 { 6355 0x8b, 0x8b, /* movl offset(%ebx), %ecx */ 6356 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 6357 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */ 6358 0xff, 0xe1, /* jmp *%ecx */ 6359 6360 /* Pad to the next 32-byte boundary with nop instructions. */ 6361 0x90, 6362 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 6363 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 6364 6365 /* Lazy GOT entries point here (32-byte aligned). */ 6366 0x68, /* pushl immediate */ 6367 0, 0, 0, 0, /* replaced with offset into relocation table. */ 6368 0xe9, /* jmp relative */ 6369 0, 0, 0, 0, /* replaced with offset to start of .plt. */ 6370 6371 /* Pad to the next 32-byte boundary with nop instructions. */ 6372 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 6373 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 6374 0x90, 0x90 6375 }; 6376 6377static const bfd_byte elf_i386_nacl_eh_frame_plt[] = 6378 { 6379#if (PLT_CIE_LENGTH != 20 \ 6380 || PLT_FDE_LENGTH != 36 \ 6381 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \ 6382 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12) 6383# error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!" 6384#endif 6385 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ 6386 0, 0, 0, 0, /* CIE ID */ 6387 1, /* CIE version */ 6388 'z', 'R', 0, /* Augmentation string */ 6389 1, /* Code alignment factor */ 6390 0x7c, /* Data alignment factor: -4 */ 6391 8, /* Return address column */ 6392 1, /* Augmentation size */ 6393 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ 6394 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ 6395 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ 6396 DW_CFA_nop, DW_CFA_nop, 6397 6398 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ 6399 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ 6400 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ 6401 0, 0, 0, 0, /* .plt size goes here */ 6402 0, /* Augmentation size */ 6403 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ 6404 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ 6405 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ 6406 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */ 6407 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ 6408 13, /* Block length */ 6409 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ 6410 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ 6411 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge, 6412 DW_OP_lit2, DW_OP_shl, DW_OP_plus, 6413 DW_CFA_nop, DW_CFA_nop 6414 }; 6415 6416static const struct elf_i386_plt_layout elf_i386_nacl_plt = 6417 { 6418 elf_i386_nacl_plt0_entry, /* plt0_entry */ 6419 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */ 6420 2, /* plt0_got1_offset */ 6421 8, /* plt0_got2_offset */ 6422 elf_i386_nacl_plt_entry, /* plt_entry */ 6423 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */ 6424 2, /* plt_got_offset */ 6425 33, /* plt_reloc_offset */ 6426 38, /* plt_plt_offset */ 6427 32, /* plt_lazy_offset */ 6428 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */ 6429 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */ 6430 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */ 6431 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */ 6432 }; 6433 6434static const struct elf_i386_backend_data elf_i386_nacl_arch_bed = 6435 { 6436 &elf_i386_nacl_plt, /* plt */ 6437 0x90, /* plt0_pad_byte: nop insn */ 6438 0, /* is_vxworks */ 6439 }; 6440 6441static bfd_boolean 6442elf32_i386_nacl_elf_object_p (bfd *abfd) 6443{ 6444 /* Set the right machine number for a NaCl i386 ELF32 file. */ 6445 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl); 6446 return TRUE; 6447} 6448 6449#undef elf_backend_arch_data 6450#define elf_backend_arch_data &elf_i386_nacl_arch_bed 6451 6452#undef elf_backend_object_p 6453#define elf_backend_object_p elf32_i386_nacl_elf_object_p 6454#undef elf_backend_modify_segment_map 6455#define elf_backend_modify_segment_map nacl_modify_segment_map 6456#undef elf_backend_modify_program_headers 6457#define elf_backend_modify_program_headers nacl_modify_program_headers 6458#undef elf_backend_final_write_processing 6459#define elf_backend_final_write_processing nacl_final_write_processing 6460 6461#include "elf32-target.h" 6462 6463/* Restore defaults. */ 6464#undef elf_backend_object_p 6465#undef elf_backend_modify_segment_map 6466#undef elf_backend_modify_program_headers 6467#undef elf_backend_final_write_processing 6468 6469/* VxWorks support. */ 6470 6471#undef TARGET_LITTLE_SYM 6472#define TARGET_LITTLE_SYM i386_elf32_vxworks_vec 6473#undef TARGET_LITTLE_NAME 6474#define TARGET_LITTLE_NAME "elf32-i386-vxworks" 6475#undef ELF_OSABI 6476#undef elf_backend_plt_alignment 6477#define elf_backend_plt_alignment 4 6478 6479static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed = 6480 { 6481 &elf_i386_plt, /* plt */ 6482 0x90, /* plt0_pad_byte */ 6483 1, /* is_vxworks */ 6484 }; 6485 6486#undef elf_backend_arch_data 6487#define elf_backend_arch_data &elf_i386_vxworks_arch_bed 6488 6489#undef elf_backend_relocs_compatible 6490#undef elf_backend_add_symbol_hook 6491#define elf_backend_add_symbol_hook \ 6492 elf_vxworks_add_symbol_hook 6493#undef elf_backend_link_output_symbol_hook 6494#define elf_backend_link_output_symbol_hook \ 6495 elf_vxworks_link_output_symbol_hook 6496#undef elf_backend_emit_relocs 6497#define elf_backend_emit_relocs elf_vxworks_emit_relocs 6498#undef elf_backend_final_write_processing 6499#define elf_backend_final_write_processing \ 6500 elf_vxworks_final_write_processing 6501#undef elf_backend_static_tls_alignment 6502 6503/* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so 6504 define it. */ 6505#undef elf_backend_want_plt_sym 6506#define elf_backend_want_plt_sym 1 6507 6508#undef elf32_bed 6509#define elf32_bed elf32_i386_vxworks_bed 6510 6511#include "elf32-target.h" 6512