1 /* Intel 80386/80486-specific support for 32-bit ELF 2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 3 2003, 2004, 2005, 2006 Free Software Foundation, Inc. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 20 21 #include "bfd.h" 22 #include "sysdep.h" 23 #include "bfdlink.h" 24 #include "libbfd.h" 25 #include "elf-bfd.h" 26 #include "elf-vxworks.h" 27 28 /* 386 uses REL relocations instead of RELA. */ 29 #define USE_REL 1 30 31 #include "elf/i386.h" 32 33 static reloc_howto_type elf_howto_table[]= 34 { 35 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield, 36 bfd_elf_generic_reloc, "R_386_NONE", 37 TRUE, 0x00000000, 0x00000000, FALSE), 38 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 39 bfd_elf_generic_reloc, "R_386_32", 40 TRUE, 0xffffffff, 0xffffffff, FALSE), 41 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 42 bfd_elf_generic_reloc, "R_386_PC32", 43 TRUE, 0xffffffff, 0xffffffff, TRUE), 44 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 45 bfd_elf_generic_reloc, "R_386_GOT32", 46 TRUE, 0xffffffff, 0xffffffff, FALSE), 47 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 48 bfd_elf_generic_reloc, "R_386_PLT32", 49 TRUE, 0xffffffff, 0xffffffff, TRUE), 50 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 51 bfd_elf_generic_reloc, "R_386_COPY", 52 TRUE, 0xffffffff, 0xffffffff, FALSE), 53 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 54 bfd_elf_generic_reloc, "R_386_GLOB_DAT", 55 TRUE, 0xffffffff, 0xffffffff, FALSE), 56 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 57 bfd_elf_generic_reloc, "R_386_JUMP_SLOT", 58 TRUE, 0xffffffff, 0xffffffff, FALSE), 59 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 60 bfd_elf_generic_reloc, "R_386_RELATIVE", 61 TRUE, 0xffffffff, 0xffffffff, FALSE), 62 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 63 bfd_elf_generic_reloc, "R_386_GOTOFF", 64 TRUE, 0xffffffff, 0xffffffff, FALSE), 65 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 66 bfd_elf_generic_reloc, "R_386_GOTPC", 67 TRUE, 0xffffffff, 0xffffffff, TRUE), 68 69 /* We have a gap in the reloc numbers here. 70 R_386_standard counts the number up to this point, and 71 R_386_ext_offset is the value to subtract from a reloc type of 72 R_386_16 thru R_386_PC8 to form an index into this table. */ 73 #define R_386_standard (R_386_GOTPC + 1) 74 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard) 75 76 /* These relocs are a GNU extension. */ 77 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 78 bfd_elf_generic_reloc, "R_386_TLS_TPOFF", 79 TRUE, 0xffffffff, 0xffffffff, FALSE), 80 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 81 bfd_elf_generic_reloc, "R_386_TLS_IE", 82 TRUE, 0xffffffff, 0xffffffff, FALSE), 83 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 84 bfd_elf_generic_reloc, "R_386_TLS_GOTIE", 85 TRUE, 0xffffffff, 0xffffffff, FALSE), 86 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 87 bfd_elf_generic_reloc, "R_386_TLS_LE", 88 TRUE, 0xffffffff, 0xffffffff, FALSE), 89 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 90 bfd_elf_generic_reloc, "R_386_TLS_GD", 91 TRUE, 0xffffffff, 0xffffffff, FALSE), 92 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 93 bfd_elf_generic_reloc, "R_386_TLS_LDM", 94 TRUE, 0xffffffff, 0xffffffff, FALSE), 95 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 96 bfd_elf_generic_reloc, "R_386_16", 97 TRUE, 0xffff, 0xffff, FALSE), 98 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 99 bfd_elf_generic_reloc, "R_386_PC16", 100 TRUE, 0xffff, 0xffff, TRUE), 101 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 102 bfd_elf_generic_reloc, "R_386_8", 103 TRUE, 0xff, 0xff, FALSE), 104 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, 105 bfd_elf_generic_reloc, "R_386_PC8", 106 TRUE, 0xff, 0xff, TRUE), 107 108 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset) 109 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext) 110 /* These are common with Solaris TLS implementation. */ 111 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 112 bfd_elf_generic_reloc, "R_386_TLS_LDO_32", 113 TRUE, 0xffffffff, 0xffffffff, FALSE), 114 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 115 bfd_elf_generic_reloc, "R_386_TLS_IE_32", 116 TRUE, 0xffffffff, 0xffffffff, FALSE), 117 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 118 bfd_elf_generic_reloc, "R_386_TLS_LE_32", 119 TRUE, 0xffffffff, 0xffffffff, FALSE), 120 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 121 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32", 122 TRUE, 0xffffffff, 0xffffffff, FALSE), 123 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 124 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32", 125 TRUE, 0xffffffff, 0xffffffff, FALSE), 126 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 127 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32", 128 TRUE, 0xffffffff, 0xffffffff, FALSE), 129 EMPTY_HOWTO (38), 130 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 131 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC", 132 TRUE, 0xffffffff, 0xffffffff, FALSE), 133 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, 134 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL", 135 FALSE, 0, 0, FALSE), 136 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 137 bfd_elf_generic_reloc, "R_386_TLS_DESC", 138 TRUE, 0xffffffff, 0xffffffff, FALSE), 139 140 /* Another gap. */ 141 #define R_386_tls (R_386_TLS_DESC + 1 - R_386_tls_offset) 142 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls) 143 144 /* GNU extension to record C++ vtable hierarchy. */ 145 HOWTO (R_386_GNU_VTINHERIT, /* type */ 146 0, /* rightshift */ 147 2, /* size (0 = byte, 1 = short, 2 = long) */ 148 0, /* bitsize */ 149 FALSE, /* pc_relative */ 150 0, /* bitpos */ 151 complain_overflow_dont, /* complain_on_overflow */ 152 NULL, /* special_function */ 153 "R_386_GNU_VTINHERIT", /* name */ 154 FALSE, /* partial_inplace */ 155 0, /* src_mask */ 156 0, /* dst_mask */ 157 FALSE), /* pcrel_offset */ 158 159 /* GNU extension to record C++ vtable member usage. */ 160 HOWTO (R_386_GNU_VTENTRY, /* type */ 161 0, /* rightshift */ 162 2, /* size (0 = byte, 1 = short, 2 = long) */ 163 0, /* bitsize */ 164 FALSE, /* pc_relative */ 165 0, /* bitpos */ 166 complain_overflow_dont, /* complain_on_overflow */ 167 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 168 "R_386_GNU_VTENTRY", /* name */ 169 FALSE, /* partial_inplace */ 170 0, /* src_mask */ 171 0, /* dst_mask */ 172 FALSE) /* pcrel_offset */ 173 174 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset) 175 176 }; 177 178 #ifdef DEBUG_GEN_RELOC 179 #define TRACE(str) \ 180 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) 181 #else 182 #define TRACE(str) 183 #endif 184 185 static reloc_howto_type * 186 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 187 bfd_reloc_code_real_type code) 188 { 189 switch (code) 190 { 191 case BFD_RELOC_NONE: 192 TRACE ("BFD_RELOC_NONE"); 193 return &elf_howto_table[R_386_NONE]; 194 195 case BFD_RELOC_32: 196 TRACE ("BFD_RELOC_32"); 197 return &elf_howto_table[R_386_32]; 198 199 case BFD_RELOC_CTOR: 200 TRACE ("BFD_RELOC_CTOR"); 201 return &elf_howto_table[R_386_32]; 202 203 case BFD_RELOC_32_PCREL: 204 TRACE ("BFD_RELOC_PC32"); 205 return &elf_howto_table[R_386_PC32]; 206 207 case BFD_RELOC_386_GOT32: 208 TRACE ("BFD_RELOC_386_GOT32"); 209 return &elf_howto_table[R_386_GOT32]; 210 211 case BFD_RELOC_386_PLT32: 212 TRACE ("BFD_RELOC_386_PLT32"); 213 return &elf_howto_table[R_386_PLT32]; 214 215 case BFD_RELOC_386_COPY: 216 TRACE ("BFD_RELOC_386_COPY"); 217 return &elf_howto_table[R_386_COPY]; 218 219 case BFD_RELOC_386_GLOB_DAT: 220 TRACE ("BFD_RELOC_386_GLOB_DAT"); 221 return &elf_howto_table[R_386_GLOB_DAT]; 222 223 case BFD_RELOC_386_JUMP_SLOT: 224 TRACE ("BFD_RELOC_386_JUMP_SLOT"); 225 return &elf_howto_table[R_386_JUMP_SLOT]; 226 227 case BFD_RELOC_386_RELATIVE: 228 TRACE ("BFD_RELOC_386_RELATIVE"); 229 return &elf_howto_table[R_386_RELATIVE]; 230 231 case BFD_RELOC_386_GOTOFF: 232 TRACE ("BFD_RELOC_386_GOTOFF"); 233 return &elf_howto_table[R_386_GOTOFF]; 234 235 case BFD_RELOC_386_GOTPC: 236 TRACE ("BFD_RELOC_386_GOTPC"); 237 return &elf_howto_table[R_386_GOTPC]; 238 239 /* These relocs are a GNU extension. */ 240 case BFD_RELOC_386_TLS_TPOFF: 241 TRACE ("BFD_RELOC_386_TLS_TPOFF"); 242 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset]; 243 244 case BFD_RELOC_386_TLS_IE: 245 TRACE ("BFD_RELOC_386_TLS_IE"); 246 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset]; 247 248 case BFD_RELOC_386_TLS_GOTIE: 249 TRACE ("BFD_RELOC_386_TLS_GOTIE"); 250 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset]; 251 252 case BFD_RELOC_386_TLS_LE: 253 TRACE ("BFD_RELOC_386_TLS_LE"); 254 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset]; 255 256 case BFD_RELOC_386_TLS_GD: 257 TRACE ("BFD_RELOC_386_TLS_GD"); 258 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset]; 259 260 case BFD_RELOC_386_TLS_LDM: 261 TRACE ("BFD_RELOC_386_TLS_LDM"); 262 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset]; 263 264 case BFD_RELOC_16: 265 TRACE ("BFD_RELOC_16"); 266 return &elf_howto_table[R_386_16 - R_386_ext_offset]; 267 268 case BFD_RELOC_16_PCREL: 269 TRACE ("BFD_RELOC_16_PCREL"); 270 return &elf_howto_table[R_386_PC16 - R_386_ext_offset]; 271 272 case BFD_RELOC_8: 273 TRACE ("BFD_RELOC_8"); 274 return &elf_howto_table[R_386_8 - R_386_ext_offset]; 275 276 case BFD_RELOC_8_PCREL: 277 TRACE ("BFD_RELOC_8_PCREL"); 278 return &elf_howto_table[R_386_PC8 - R_386_ext_offset]; 279 280 /* Common with Sun TLS implementation. */ 281 case BFD_RELOC_386_TLS_LDO_32: 282 TRACE ("BFD_RELOC_386_TLS_LDO_32"); 283 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset]; 284 285 case BFD_RELOC_386_TLS_IE_32: 286 TRACE ("BFD_RELOC_386_TLS_IE_32"); 287 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset]; 288 289 case BFD_RELOC_386_TLS_LE_32: 290 TRACE ("BFD_RELOC_386_TLS_LE_32"); 291 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset]; 292 293 case BFD_RELOC_386_TLS_DTPMOD32: 294 TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); 295 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset]; 296 297 case BFD_RELOC_386_TLS_DTPOFF32: 298 TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); 299 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset]; 300 301 case BFD_RELOC_386_TLS_TPOFF32: 302 TRACE ("BFD_RELOC_386_TLS_TPOFF32"); 303 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset]; 304 305 case BFD_RELOC_386_TLS_GOTDESC: 306 TRACE ("BFD_RELOC_386_TLS_GOTDESC"); 307 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset]; 308 309 case BFD_RELOC_386_TLS_DESC_CALL: 310 TRACE ("BFD_RELOC_386_TLS_DESC_CALL"); 311 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset]; 312 313 case BFD_RELOC_386_TLS_DESC: 314 TRACE ("BFD_RELOC_386_TLS_DESC"); 315 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset]; 316 317 case BFD_RELOC_VTABLE_INHERIT: 318 TRACE ("BFD_RELOC_VTABLE_INHERIT"); 319 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset]; 320 321 case BFD_RELOC_VTABLE_ENTRY: 322 TRACE ("BFD_RELOC_VTABLE_ENTRY"); 323 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset]; 324 325 default: 326 break; 327 } 328 329 TRACE ("Unknown"); 330 return 0; 331 } 332 333 static void 334 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, 335 arelent *cache_ptr, 336 Elf_Internal_Rela *dst) 337 { 338 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 339 unsigned int indx; 340 341 if ((indx = r_type) >= R_386_standard 342 && ((indx = r_type - R_386_ext_offset) - R_386_standard 343 >= R_386_ext - R_386_standard) 344 && ((indx = r_type - R_386_tls_offset) - R_386_ext 345 >= R_386_tls - R_386_ext) 346 && ((indx = r_type - R_386_vt_offset) - R_386_tls 347 >= R_386_vt - R_386_tls)) 348 { 349 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 350 abfd, (int) r_type); 351 indx = R_386_NONE; 352 } 353 cache_ptr->howto = &elf_howto_table[indx]; 354 } 355 356 /* Return whether a symbol name implies a local label. The UnixWare 357 2.1 cc generates temporary symbols that start with .X, so we 358 recognize them here. FIXME: do other SVR4 compilers also use .X?. 359 If so, we should move the .X recognition into 360 _bfd_elf_is_local_label_name. */ 361 362 static bfd_boolean 363 elf_i386_is_local_label_name (bfd *abfd, const char *name) 364 { 365 if (name[0] == '.' && name[1] == 'X') 366 return TRUE; 367 368 return _bfd_elf_is_local_label_name (abfd, name); 369 } 370 371 /* Support for core dump NOTE sections. */ 372 373 static bfd_boolean 374 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 375 { 376 int offset; 377 size_t size; 378 379 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 380 { 381 int pr_version = bfd_get_32 (abfd, note->descdata); 382 383 if (pr_version != 1) 384 return FALSE; 385 386 /* pr_cursig */ 387 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20); 388 389 /* pr_pid */ 390 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); 391 392 /* pr_reg */ 393 offset = 28; 394 size = bfd_get_32 (abfd, note->descdata + 8); 395 } 396 else 397 { 398 switch (note->descsz) 399 { 400 default: 401 return FALSE; 402 403 case 144: /* Linux/i386 */ 404 /* pr_cursig */ 405 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 406 407 /* pr_pid */ 408 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); 409 410 /* pr_reg */ 411 offset = 72; 412 size = 68; 413 414 break; 415 } 416 } 417 418 /* Make a ".reg/999" section. */ 419 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 420 size, note->descpos + offset); 421 } 422 423 static bfd_boolean 424 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 425 { 426 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 427 { 428 int pr_version = bfd_get_32 (abfd, note->descdata); 429 430 if (pr_version != 1) 431 return FALSE; 432 433 elf_tdata (abfd)->core_program 434 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); 435 elf_tdata (abfd)->core_command 436 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); 437 } 438 else 439 { 440 switch (note->descsz) 441 { 442 default: 443 return FALSE; 444 445 case 124: /* Linux/i386 elf_prpsinfo. */ 446 elf_tdata (abfd)->core_program 447 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 448 elf_tdata (abfd)->core_command 449 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 450 } 451 } 452 453 /* Note that for some reason, a spurious space is tacked 454 onto the end of the args in some (at least one anyway) 455 implementations, so strip it off if it exists. */ 456 { 457 char *command = elf_tdata (abfd)->core_command; 458 int n = strlen (command); 459 460 if (0 < n && command[n - 1] == ' ') 461 command[n - 1] = '\0'; 462 } 463 464 return TRUE; 465 } 466 467 /* Functions for the i386 ELF linker. 468 469 In order to gain some understanding of code in this file without 470 knowing all the intricate details of the linker, note the 471 following: 472 473 Functions named elf_i386_* are called by external routines, other 474 functions are only called locally. elf_i386_* functions appear 475 in this file more or less in the order in which they are called 476 from external routines. eg. elf_i386_check_relocs is called 477 early in the link process, elf_i386_finish_dynamic_sections is 478 one of the last functions. */ 479 480 481 /* The name of the dynamic interpreter. This is put in the .interp 482 section. */ 483 484 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 485 486 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 487 copying dynamic variables from a shared lib into an app's dynbss 488 section, and instead use a dynamic relocation to point into the 489 shared lib. */ 490 #define ELIMINATE_COPY_RELOCS 1 491 492 /* The size in bytes of an entry in the procedure linkage table. */ 493 494 #define PLT_ENTRY_SIZE 16 495 496 /* The first entry in an absolute procedure linkage table looks like 497 this. See the SVR4 ABI i386 supplement to see how this works. 498 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ 499 500 static const bfd_byte elf_i386_plt0_entry[12] = 501 { 502 0xff, 0x35, /* pushl contents of address */ 503 0, 0, 0, 0, /* replaced with address of .got + 4. */ 504 0xff, 0x25, /* jmp indirect */ 505 0, 0, 0, 0 /* replaced with address of .got + 8. */ 506 }; 507 508 /* Subsequent entries in an absolute procedure linkage table look like 509 this. */ 510 511 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = 512 { 513 0xff, 0x25, /* jmp indirect */ 514 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ 515 0x68, /* pushl immediate */ 516 0, 0, 0, 0, /* replaced with offset into relocation table. */ 517 0xe9, /* jmp relative */ 518 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 519 }; 520 521 /* The first entry in a PIC procedure linkage table look like this. 522 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ 523 524 static const bfd_byte elf_i386_pic_plt0_entry[12] = 525 { 526 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ 527 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */ 528 }; 529 530 /* Subsequent entries in a PIC procedure linkage table look like this. */ 531 532 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = 533 { 534 0xff, 0xa3, /* jmp *offset(%ebx) */ 535 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 536 0x68, /* pushl immediate */ 537 0, 0, 0, 0, /* replaced with offset into relocation table. */ 538 0xe9, /* jmp relative */ 539 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 540 }; 541 542 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations 543 for the PLTResolve stub and then for each PLT entry. */ 544 #define PLTRESOLVE_RELOCS_SHLIB 0 545 #define PLTRESOLVE_RELOCS 2 546 #define PLT_NON_JUMP_SLOT_RELOCS 2 547 548 /* The i386 linker needs to keep track of the number of relocs that it 549 decides to copy as dynamic relocs in check_relocs for each symbol. 550 This is so that it can later discard them if they are found to be 551 unnecessary. We store the information in a field extending the 552 regular ELF linker hash table. */ 553 554 struct elf_i386_dyn_relocs 555 { 556 struct elf_i386_dyn_relocs *next; 557 558 /* The input section of the reloc. */ 559 asection *sec; 560 561 /* Total number of relocs copied for the input section. */ 562 bfd_size_type count; 563 564 /* Number of pc-relative relocs copied for the input section. */ 565 bfd_size_type pc_count; 566 }; 567 568 /* i386 ELF linker hash entry. */ 569 570 struct elf_i386_link_hash_entry 571 { 572 struct elf_link_hash_entry elf; 573 574 /* Track dynamic relocs copied for this symbol. */ 575 struct elf_i386_dyn_relocs *dyn_relocs; 576 577 #define GOT_UNKNOWN 0 578 #define GOT_NORMAL 1 579 #define GOT_TLS_GD 2 580 #define GOT_TLS_IE 4 581 #define GOT_TLS_IE_POS 5 582 #define GOT_TLS_IE_NEG 6 583 #define GOT_TLS_IE_BOTH 7 584 #define GOT_TLS_GDESC 8 585 #define GOT_TLS_MASK 0x0f 586 #define GOT_TLS_IE_IE 0x10 587 #define GOT_TLS_IE_GD 0x20 588 #define GOT_TLS_IE_MASK 0x30 589 #define GOT_TLS_GD_BOTH_P(type) \ 590 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) 591 #define GOT_TLS_GD_P(type) \ 592 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) 593 #define GOT_TLS_GDESC_P(type) \ 594 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) 595 #define GOT_TLS_GD_ANY_P(type) \ 596 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) 597 unsigned char tls_type; 598 599 /* Offset of the GOTPLT entry reserved for the TLS descriptor, 600 starting at the end of the jump table. */ 601 bfd_vma tlsdesc_got; 602 }; 603 604 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent)) 605 606 struct elf_i386_obj_tdata 607 { 608 struct elf_obj_tdata root; 609 610 /* tls_type for each local got entry. */ 611 char *local_got_tls_type; 612 613 /* GOTPLT entries for TLS descriptors. */ 614 bfd_vma *local_tlsdesc_gotent; 615 }; 616 617 #define elf_i386_tdata(abfd) \ 618 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any) 619 620 #define elf_i386_local_got_tls_type(abfd) \ 621 (elf_i386_tdata (abfd)->local_got_tls_type) 622 623 #define elf_i386_local_tlsdesc_gotent(abfd) \ 624 (elf_i386_tdata (abfd)->local_tlsdesc_gotent) 625 626 static bfd_boolean 627 elf_i386_mkobject (bfd *abfd) 628 { 629 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata); 630 abfd->tdata.any = bfd_zalloc (abfd, amt); 631 if (abfd->tdata.any == NULL) 632 return FALSE; 633 return TRUE; 634 } 635 636 /* i386 ELF linker hash table. */ 637 638 struct elf_i386_link_hash_table 639 { 640 struct elf_link_hash_table elf; 641 642 /* Short-cuts to get to dynamic linker sections. */ 643 asection *sgot; 644 asection *sgotplt; 645 asection *srelgot; 646 asection *splt; 647 asection *srelplt; 648 asection *sdynbss; 649 asection *srelbss; 650 651 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */ 652 asection *srelplt2; 653 654 /* True if the target system is VxWorks. */ 655 int is_vxworks; 656 657 /* Value used to fill the last word of the first plt entry. */ 658 bfd_byte plt0_pad_byte; 659 660 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */ 661 bfd_vma next_tls_desc_index; 662 663 union { 664 bfd_signed_vma refcount; 665 bfd_vma offset; 666 } tls_ldm_got; 667 668 /* The amount of space used by the reserved portion of the sgotplt 669 section, plus whatever space is used by the jump slots. */ 670 bfd_vma sgotplt_jump_table_size; 671 672 /* Small local sym to section mapping cache. */ 673 struct sym_sec_cache sym_sec; 674 }; 675 676 /* Get the i386 ELF linker hash table from a link_info structure. */ 677 678 #define elf_i386_hash_table(p) \ 679 ((struct elf_i386_link_hash_table *) ((p)->hash)) 680 681 #define elf_i386_compute_jump_table_size(htab) \ 682 ((htab)->next_tls_desc_index * 4) 683 684 /* Create an entry in an i386 ELF linker hash table. */ 685 686 static struct bfd_hash_entry * 687 link_hash_newfunc (struct bfd_hash_entry *entry, 688 struct bfd_hash_table *table, 689 const char *string) 690 { 691 /* Allocate the structure if it has not already been allocated by a 692 subclass. */ 693 if (entry == NULL) 694 { 695 entry = bfd_hash_allocate (table, 696 sizeof (struct elf_i386_link_hash_entry)); 697 if (entry == NULL) 698 return entry; 699 } 700 701 /* Call the allocation method of the superclass. */ 702 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 703 if (entry != NULL) 704 { 705 struct elf_i386_link_hash_entry *eh; 706 707 eh = (struct elf_i386_link_hash_entry *) entry; 708 eh->dyn_relocs = NULL; 709 eh->tls_type = GOT_UNKNOWN; 710 eh->tlsdesc_got = (bfd_vma) -1; 711 } 712 713 return entry; 714 } 715 716 /* Create an i386 ELF linker hash table. */ 717 718 static struct bfd_link_hash_table * 719 elf_i386_link_hash_table_create (bfd *abfd) 720 { 721 struct elf_i386_link_hash_table *ret; 722 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); 723 724 ret = bfd_malloc (amt); 725 if (ret == NULL) 726 return NULL; 727 728 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 729 sizeof (struct elf_i386_link_hash_entry))) 730 { 731 free (ret); 732 return NULL; 733 } 734 735 ret->sgot = NULL; 736 ret->sgotplt = NULL; 737 ret->srelgot = NULL; 738 ret->splt = NULL; 739 ret->srelplt = NULL; 740 ret->sdynbss = NULL; 741 ret->srelbss = NULL; 742 ret->tls_ldm_got.refcount = 0; 743 ret->next_tls_desc_index = 0; 744 ret->sgotplt_jump_table_size = 0; 745 ret->sym_sec.abfd = NULL; 746 ret->is_vxworks = 0; 747 ret->srelplt2 = NULL; 748 ret->plt0_pad_byte = 0; 749 750 return &ret->elf.root; 751 } 752 753 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up 754 shortcuts to them in our hash table. */ 755 756 static bfd_boolean 757 create_got_section (bfd *dynobj, struct bfd_link_info *info) 758 { 759 struct elf_i386_link_hash_table *htab; 760 761 if (! _bfd_elf_create_got_section (dynobj, info)) 762 return FALSE; 763 764 htab = elf_i386_hash_table (info); 765 htab->sgot = bfd_get_section_by_name (dynobj, ".got"); 766 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 767 if (!htab->sgot || !htab->sgotplt) 768 abort (); 769 770 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got", 771 (SEC_ALLOC | SEC_LOAD 772 | SEC_HAS_CONTENTS 773 | SEC_IN_MEMORY 774 | SEC_LINKER_CREATED 775 | SEC_READONLY)); 776 if (htab->srelgot == NULL 777 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) 778 return FALSE; 779 return TRUE; 780 } 781 782 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and 783 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our 784 hash table. */ 785 786 static bfd_boolean 787 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 788 { 789 struct elf_i386_link_hash_table *htab; 790 791 htab = elf_i386_hash_table (info); 792 if (!htab->sgot && !create_got_section (dynobj, info)) 793 return FALSE; 794 795 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 796 return FALSE; 797 798 htab->splt = bfd_get_section_by_name (dynobj, ".plt"); 799 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); 800 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 801 if (!info->shared) 802 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); 803 804 if (!htab->splt || !htab->srelplt || !htab->sdynbss 805 || (!info->shared && !htab->srelbss)) 806 abort (); 807 808 if (htab->is_vxworks 809 && !elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2)) 810 return FALSE; 811 812 return TRUE; 813 } 814 815 /* Copy the extra info we tack onto an elf_link_hash_entry. */ 816 817 static void 818 elf_i386_copy_indirect_symbol (struct bfd_link_info *info, 819 struct elf_link_hash_entry *dir, 820 struct elf_link_hash_entry *ind) 821 { 822 struct elf_i386_link_hash_entry *edir, *eind; 823 824 edir = (struct elf_i386_link_hash_entry *) dir; 825 eind = (struct elf_i386_link_hash_entry *) ind; 826 827 if (eind->dyn_relocs != NULL) 828 { 829 if (edir->dyn_relocs != NULL) 830 { 831 struct elf_i386_dyn_relocs **pp; 832 struct elf_i386_dyn_relocs *p; 833 834 /* Add reloc counts against the indirect sym to the direct sym 835 list. Merge any entries against the same section. */ 836 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 837 { 838 struct elf_i386_dyn_relocs *q; 839 840 for (q = edir->dyn_relocs; q != NULL; q = q->next) 841 if (q->sec == p->sec) 842 { 843 q->pc_count += p->pc_count; 844 q->count += p->count; 845 *pp = p->next; 846 break; 847 } 848 if (q == NULL) 849 pp = &p->next; 850 } 851 *pp = edir->dyn_relocs; 852 } 853 854 edir->dyn_relocs = eind->dyn_relocs; 855 eind->dyn_relocs = NULL; 856 } 857 858 if (ind->root.type == bfd_link_hash_indirect 859 && dir->got.refcount <= 0) 860 { 861 edir->tls_type = eind->tls_type; 862 eind->tls_type = GOT_UNKNOWN; 863 } 864 865 if (ELIMINATE_COPY_RELOCS 866 && ind->root.type != bfd_link_hash_indirect 867 && dir->dynamic_adjusted) 868 { 869 /* If called to transfer flags for a weakdef during processing 870 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 871 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 872 dir->ref_dynamic |= ind->ref_dynamic; 873 dir->ref_regular |= ind->ref_regular; 874 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 875 dir->needs_plt |= ind->needs_plt; 876 dir->pointer_equality_needed |= ind->pointer_equality_needed; 877 } 878 else 879 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 880 } 881 882 static int 883 elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local) 884 { 885 if (info->shared && !info->executable) 886 return r_type; 887 888 switch (r_type) 889 { 890 case R_386_TLS_GD: 891 case R_386_TLS_GOTDESC: 892 case R_386_TLS_DESC_CALL: 893 case R_386_TLS_IE_32: 894 if (is_local) 895 return R_386_TLS_LE_32; 896 return R_386_TLS_IE_32; 897 case R_386_TLS_IE: 898 case R_386_TLS_GOTIE: 899 if (is_local) 900 return R_386_TLS_LE_32; 901 return r_type; 902 case R_386_TLS_LDM: 903 return R_386_TLS_LE_32; 904 } 905 906 return r_type; 907 } 908 909 /* Look through the relocs for a section during the first phase, and 910 calculate needed space in the global offset table, procedure linkage 911 table, and dynamic reloc sections. */ 912 913 static bfd_boolean 914 elf_i386_check_relocs (bfd *abfd, 915 struct bfd_link_info *info, 916 asection *sec, 917 const Elf_Internal_Rela *relocs) 918 { 919 struct elf_i386_link_hash_table *htab; 920 Elf_Internal_Shdr *symtab_hdr; 921 struct elf_link_hash_entry **sym_hashes; 922 const Elf_Internal_Rela *rel; 923 const Elf_Internal_Rela *rel_end; 924 asection *sreloc; 925 926 if (info->relocatable) 927 return TRUE; 928 929 htab = elf_i386_hash_table (info); 930 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 931 sym_hashes = elf_sym_hashes (abfd); 932 933 sreloc = NULL; 934 935 rel_end = relocs + sec->reloc_count; 936 for (rel = relocs; rel < rel_end; rel++) 937 { 938 unsigned int r_type; 939 unsigned long r_symndx; 940 struct elf_link_hash_entry *h; 941 942 r_symndx = ELF32_R_SYM (rel->r_info); 943 r_type = ELF32_R_TYPE (rel->r_info); 944 945 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 946 { 947 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), 948 abfd, 949 r_symndx); 950 return FALSE; 951 } 952 953 if (r_symndx < symtab_hdr->sh_info) 954 h = NULL; 955 else 956 { 957 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 958 while (h->root.type == bfd_link_hash_indirect 959 || h->root.type == bfd_link_hash_warning) 960 h = (struct elf_link_hash_entry *) h->root.u.i.link; 961 } 962 963 r_type = elf_i386_tls_transition (info, r_type, h == NULL); 964 965 switch (r_type) 966 { 967 case R_386_TLS_LDM: 968 htab->tls_ldm_got.refcount += 1; 969 goto create_got; 970 971 case R_386_PLT32: 972 /* This symbol requires a procedure linkage table entry. We 973 actually build the entry in adjust_dynamic_symbol, 974 because this might be a case of linking PIC code which is 975 never referenced by a dynamic object, in which case we 976 don't need to generate a procedure linkage table entry 977 after all. */ 978 979 /* If this is a local symbol, we resolve it directly without 980 creating a procedure linkage table entry. */ 981 if (h == NULL) 982 continue; 983 984 h->needs_plt = 1; 985 h->plt.refcount += 1; 986 break; 987 988 case R_386_TLS_IE_32: 989 case R_386_TLS_IE: 990 case R_386_TLS_GOTIE: 991 if (info->shared && !info->executable) 992 info->flags |= DF_STATIC_TLS; 993 /* Fall through */ 994 995 case R_386_GOT32: 996 case R_386_TLS_GD: 997 case R_386_TLS_GOTDESC: 998 case R_386_TLS_DESC_CALL: 999 /* This symbol requires a global offset table entry. */ 1000 { 1001 int tls_type, old_tls_type; 1002 1003 switch (r_type) 1004 { 1005 default: 1006 case R_386_GOT32: tls_type = GOT_NORMAL; break; 1007 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; 1008 case R_386_TLS_GOTDESC: 1009 case R_386_TLS_DESC_CALL: 1010 tls_type = GOT_TLS_GDESC; break; 1011 case R_386_TLS_IE_32: 1012 if (ELF32_R_TYPE (rel->r_info) == r_type) 1013 tls_type = GOT_TLS_IE_NEG; 1014 else if (h 1015 && ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) 1016 /* If this is a GD->IE transition, we may use either 1017 of R_386_TLS_TPOFF and R_386_TLS_TPOFF32. But if 1018 we may have both R_386_TLS_IE and R_386_TLS_GD, 1019 we can't share the same R_386_TLS_TPOFF since 1020 they require different offsets. So we remember 1021 it comes from R_386_TLS_GD. */ 1022 tls_type = GOT_TLS_IE | GOT_TLS_IE_GD; 1023 else 1024 tls_type = GOT_TLS_IE; 1025 break; 1026 case R_386_TLS_IE: 1027 if (h) 1028 { 1029 /* We remember it comes from R_386_TLS_IE. */ 1030 tls_type = GOT_TLS_IE_POS | GOT_TLS_IE_IE; 1031 break; 1032 } 1033 case R_386_TLS_GOTIE: 1034 tls_type = GOT_TLS_IE_POS; break; 1035 } 1036 1037 if (h != NULL) 1038 { 1039 h->got.refcount += 1; 1040 old_tls_type = elf_i386_hash_entry(h)->tls_type; 1041 } 1042 else 1043 { 1044 bfd_signed_vma *local_got_refcounts; 1045 1046 /* This is a global offset table entry for a local symbol. */ 1047 local_got_refcounts = elf_local_got_refcounts (abfd); 1048 if (local_got_refcounts == NULL) 1049 { 1050 bfd_size_type size; 1051 1052 size = symtab_hdr->sh_info; 1053 size *= (sizeof (bfd_signed_vma) 1054 + sizeof (bfd_vma) + sizeof(char)); 1055 local_got_refcounts = bfd_zalloc (abfd, size); 1056 if (local_got_refcounts == NULL) 1057 return FALSE; 1058 elf_local_got_refcounts (abfd) = local_got_refcounts; 1059 elf_i386_local_tlsdesc_gotent (abfd) 1060 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); 1061 elf_i386_local_got_tls_type (abfd) 1062 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); 1063 } 1064 local_got_refcounts[r_symndx] += 1; 1065 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx]; 1066 } 1067 1068 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) 1069 tls_type |= old_tls_type; 1070 /* If a TLS symbol is accessed using IE at least once, 1071 there is no point to use dynamic model for it. */ 1072 else if (old_tls_type != tls_type 1073 && old_tls_type != GOT_UNKNOWN 1074 && (! GOT_TLS_GD_ANY_P (old_tls_type) 1075 || (tls_type & GOT_TLS_IE) == 0)) 1076 { 1077 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type)) 1078 tls_type = old_tls_type; 1079 else if (GOT_TLS_GD_ANY_P (old_tls_type) 1080 && GOT_TLS_GD_ANY_P (tls_type)) 1081 tls_type |= old_tls_type; 1082 else 1083 { 1084 (*_bfd_error_handler) 1085 (_("%B: `%s' accessed both as normal and " 1086 "thread local symbol"), 1087 abfd, 1088 h ? h->root.root.string : "<local>"); 1089 return FALSE; 1090 } 1091 } 1092 1093 if (old_tls_type != tls_type) 1094 { 1095 if (h != NULL) 1096 elf_i386_hash_entry (h)->tls_type = tls_type; 1097 else 1098 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type; 1099 } 1100 } 1101 /* Fall through */ 1102 1103 case R_386_GOTOFF: 1104 case R_386_GOTPC: 1105 create_got: 1106 if (htab->sgot == NULL) 1107 { 1108 if (htab->elf.dynobj == NULL) 1109 htab->elf.dynobj = abfd; 1110 if (!create_got_section (htab->elf.dynobj, info)) 1111 return FALSE; 1112 } 1113 if (r_type != R_386_TLS_IE) 1114 break; 1115 /* Fall through */ 1116 1117 case R_386_TLS_LE_32: 1118 case R_386_TLS_LE: 1119 if (!info->shared || info->executable) 1120 break; 1121 info->flags |= DF_STATIC_TLS; 1122 /* Fall through */ 1123 1124 case R_386_32: 1125 case R_386_PC32: 1126 if (h != NULL && !info->shared) 1127 { 1128 /* If this reloc is in a read-only section, we might 1129 need a copy reloc. We can't check reliably at this 1130 stage whether the section is read-only, as input 1131 sections have not yet been mapped to output sections. 1132 Tentatively set the flag for now, and correct in 1133 adjust_dynamic_symbol. */ 1134 h->non_got_ref = 1; 1135 1136 /* We may need a .plt entry if the function this reloc 1137 refers to is in a shared lib. */ 1138 h->plt.refcount += 1; 1139 if (r_type != R_386_PC32) 1140 h->pointer_equality_needed = 1; 1141 } 1142 1143 /* If we are creating a shared library, and this is a reloc 1144 against a global symbol, or a non PC relative reloc 1145 against a local symbol, then we need to copy the reloc 1146 into the shared library. However, if we are linking with 1147 -Bsymbolic, we do not need to copy a reloc against a 1148 global symbol which is defined in an object we are 1149 including in the link (i.e., DEF_REGULAR is set). At 1150 this point we have not seen all the input files, so it is 1151 possible that DEF_REGULAR is not set now but will be set 1152 later (it is never cleared). In case of a weak definition, 1153 DEF_REGULAR may be cleared later by a strong definition in 1154 a shared library. We account for that possibility below by 1155 storing information in the relocs_copied field of the hash 1156 table entry. A similar situation occurs when creating 1157 shared libraries and symbol visibility changes render the 1158 symbol local. 1159 1160 If on the other hand, we are creating an executable, we 1161 may need to keep relocations for symbols satisfied by a 1162 dynamic library if we manage to avoid copy relocs for the 1163 symbol. */ 1164 if ((info->shared 1165 && (sec->flags & SEC_ALLOC) != 0 1166 && (r_type != R_386_PC32 1167 || (h != NULL 1168 && (! info->symbolic 1169 || h->root.type == bfd_link_hash_defweak 1170 || !h->def_regular)))) 1171 || (ELIMINATE_COPY_RELOCS 1172 && !info->shared 1173 && (sec->flags & SEC_ALLOC) != 0 1174 && h != NULL 1175 && (h->root.type == bfd_link_hash_defweak 1176 || !h->def_regular))) 1177 { 1178 struct elf_i386_dyn_relocs *p; 1179 struct elf_i386_dyn_relocs **head; 1180 1181 /* We must copy these reloc types into the output file. 1182 Create a reloc section in dynobj and make room for 1183 this reloc. */ 1184 if (sreloc == NULL) 1185 { 1186 const char *name; 1187 bfd *dynobj; 1188 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx; 1189 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name; 1190 1191 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam); 1192 if (name == NULL) 1193 return FALSE; 1194 1195 if (strncmp (name, ".rel", 4) != 0 1196 || strcmp (bfd_get_section_name (abfd, sec), 1197 name + 4) != 0) 1198 { 1199 (*_bfd_error_handler) 1200 (_("%B: bad relocation section name `%s\'"), 1201 abfd, name); 1202 } 1203 1204 if (htab->elf.dynobj == NULL) 1205 htab->elf.dynobj = abfd; 1206 1207 dynobj = htab->elf.dynobj; 1208 sreloc = bfd_get_section_by_name (dynobj, name); 1209 if (sreloc == NULL) 1210 { 1211 flagword flags; 1212 1213 flags = (SEC_HAS_CONTENTS | SEC_READONLY 1214 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 1215 if ((sec->flags & SEC_ALLOC) != 0) 1216 flags |= SEC_ALLOC | SEC_LOAD; 1217 sreloc = bfd_make_section_with_flags (dynobj, 1218 name, 1219 flags); 1220 if (sreloc == NULL 1221 || ! bfd_set_section_alignment (dynobj, sreloc, 2)) 1222 return FALSE; 1223 } 1224 elf_section_data (sec)->sreloc = sreloc; 1225 } 1226 1227 /* If this is a global symbol, we count the number of 1228 relocations we need for this symbol. */ 1229 if (h != NULL) 1230 { 1231 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs; 1232 } 1233 else 1234 { 1235 void **vpp; 1236 /* Track dynamic relocs needed for local syms too. 1237 We really need local syms available to do this 1238 easily. Oh well. */ 1239 1240 asection *s; 1241 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 1242 sec, r_symndx); 1243 if (s == NULL) 1244 return FALSE; 1245 1246 vpp = &elf_section_data (s)->local_dynrel; 1247 head = (struct elf_i386_dyn_relocs **)vpp; 1248 } 1249 1250 p = *head; 1251 if (p == NULL || p->sec != sec) 1252 { 1253 bfd_size_type amt = sizeof *p; 1254 p = bfd_alloc (htab->elf.dynobj, amt); 1255 if (p == NULL) 1256 return FALSE; 1257 p->next = *head; 1258 *head = p; 1259 p->sec = sec; 1260 p->count = 0; 1261 p->pc_count = 0; 1262 } 1263 1264 p->count += 1; 1265 if (r_type == R_386_PC32) 1266 p->pc_count += 1; 1267 } 1268 break; 1269 1270 /* This relocation describes the C++ object vtable hierarchy. 1271 Reconstruct it for later use during GC. */ 1272 case R_386_GNU_VTINHERIT: 1273 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1274 return FALSE; 1275 break; 1276 1277 /* This relocation describes which C++ vtable entries are actually 1278 used. Record for later use during GC. */ 1279 case R_386_GNU_VTENTRY: 1280 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 1281 return FALSE; 1282 break; 1283 1284 default: 1285 break; 1286 } 1287 } 1288 1289 return TRUE; 1290 } 1291 1292 /* Return the section that should be marked against GC for a given 1293 relocation. */ 1294 1295 static asection * 1296 elf_i386_gc_mark_hook (asection *sec, 1297 struct bfd_link_info *info ATTRIBUTE_UNUSED, 1298 Elf_Internal_Rela *rel, 1299 struct elf_link_hash_entry *h, 1300 Elf_Internal_Sym *sym) 1301 { 1302 if (h != NULL) 1303 { 1304 switch (ELF32_R_TYPE (rel->r_info)) 1305 { 1306 case R_386_GNU_VTINHERIT: 1307 case R_386_GNU_VTENTRY: 1308 break; 1309 1310 default: 1311 switch (h->root.type) 1312 { 1313 case bfd_link_hash_defined: 1314 case bfd_link_hash_defweak: 1315 return h->root.u.def.section; 1316 1317 case bfd_link_hash_common: 1318 return h->root.u.c.p->section; 1319 1320 default: 1321 break; 1322 } 1323 } 1324 } 1325 else 1326 return bfd_section_from_elf_index (sec->owner, sym->st_shndx); 1327 1328 return NULL; 1329 } 1330 1331 /* Update the got entry reference counts for the section being removed. */ 1332 1333 static bfd_boolean 1334 elf_i386_gc_sweep_hook (bfd *abfd, 1335 struct bfd_link_info *info, 1336 asection *sec, 1337 const Elf_Internal_Rela *relocs) 1338 { 1339 Elf_Internal_Shdr *symtab_hdr; 1340 struct elf_link_hash_entry **sym_hashes; 1341 bfd_signed_vma *local_got_refcounts; 1342 const Elf_Internal_Rela *rel, *relend; 1343 1344 elf_section_data (sec)->local_dynrel = NULL; 1345 1346 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1347 sym_hashes = elf_sym_hashes (abfd); 1348 local_got_refcounts = elf_local_got_refcounts (abfd); 1349 1350 relend = relocs + sec->reloc_count; 1351 for (rel = relocs; rel < relend; rel++) 1352 { 1353 unsigned long r_symndx; 1354 unsigned int r_type; 1355 struct elf_link_hash_entry *h = NULL; 1356 1357 r_symndx = ELF32_R_SYM (rel->r_info); 1358 if (r_symndx >= symtab_hdr->sh_info) 1359 { 1360 struct elf_i386_link_hash_entry *eh; 1361 struct elf_i386_dyn_relocs **pp; 1362 struct elf_i386_dyn_relocs *p; 1363 1364 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1365 while (h->root.type == bfd_link_hash_indirect 1366 || h->root.type == bfd_link_hash_warning) 1367 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1368 eh = (struct elf_i386_link_hash_entry *) h; 1369 1370 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1371 if (p->sec == sec) 1372 { 1373 /* Everything must go for SEC. */ 1374 *pp = p->next; 1375 break; 1376 } 1377 } 1378 1379 r_type = ELF32_R_TYPE (rel->r_info); 1380 r_type = elf_i386_tls_transition (info, r_type, h != NULL); 1381 switch (r_type) 1382 { 1383 case R_386_TLS_LDM: 1384 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0) 1385 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1; 1386 break; 1387 1388 case R_386_TLS_GD: 1389 case R_386_TLS_GOTDESC: 1390 case R_386_TLS_DESC_CALL: 1391 case R_386_TLS_IE_32: 1392 case R_386_TLS_IE: 1393 case R_386_TLS_GOTIE: 1394 case R_386_GOT32: 1395 if (h != NULL) 1396 { 1397 if (h->got.refcount > 0) 1398 h->got.refcount -= 1; 1399 } 1400 else if (local_got_refcounts != NULL) 1401 { 1402 if (local_got_refcounts[r_symndx] > 0) 1403 local_got_refcounts[r_symndx] -= 1; 1404 } 1405 break; 1406 1407 case R_386_32: 1408 case R_386_PC32: 1409 if (info->shared) 1410 break; 1411 /* Fall through */ 1412 1413 case R_386_PLT32: 1414 if (h != NULL) 1415 { 1416 if (h->plt.refcount > 0) 1417 h->plt.refcount -= 1; 1418 } 1419 break; 1420 1421 default: 1422 break; 1423 } 1424 } 1425 1426 return TRUE; 1427 } 1428 1429 /* Adjust a symbol defined by a dynamic object and referenced by a 1430 regular object. The current definition is in some section of the 1431 dynamic object, but we're not including those sections. We have to 1432 change the definition to something the rest of the link can 1433 understand. */ 1434 1435 static bfd_boolean 1436 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info, 1437 struct elf_link_hash_entry *h) 1438 { 1439 struct elf_i386_link_hash_table *htab; 1440 asection *s; 1441 unsigned int power_of_two; 1442 1443 /* If this is a function, put it in the procedure linkage table. We 1444 will fill in the contents of the procedure linkage table later, 1445 when we know the address of the .got section. */ 1446 if (h->type == STT_FUNC 1447 || h->needs_plt) 1448 { 1449 if (h->plt.refcount <= 0 1450 || SYMBOL_CALLS_LOCAL (info, h) 1451 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1452 && h->root.type == bfd_link_hash_undefweak)) 1453 { 1454 /* This case can occur if we saw a PLT32 reloc in an input 1455 file, but the symbol was never referred to by a dynamic 1456 object, or if all references were garbage collected. In 1457 such a case, we don't actually need to build a procedure 1458 linkage table, and we can just do a PC32 reloc instead. */ 1459 h->plt.offset = (bfd_vma) -1; 1460 h->needs_plt = 0; 1461 } 1462 1463 return TRUE; 1464 } 1465 else 1466 /* It's possible that we incorrectly decided a .plt reloc was 1467 needed for an R_386_PC32 reloc to a non-function sym in 1468 check_relocs. We can't decide accurately between function and 1469 non-function syms in check-relocs; Objects loaded later in 1470 the link may change h->type. So fix it now. */ 1471 h->plt.offset = (bfd_vma) -1; 1472 1473 /* If this is a weak symbol, and there is a real definition, the 1474 processor independent code will have arranged for us to see the 1475 real definition first, and we can just use the same value. */ 1476 if (h->u.weakdef != NULL) 1477 { 1478 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1479 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1480 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1481 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1482 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1483 h->non_got_ref = h->u.weakdef->non_got_ref; 1484 return TRUE; 1485 } 1486 1487 /* This is a reference to a symbol defined by a dynamic object which 1488 is not a function. */ 1489 1490 /* If we are creating a shared library, we must presume that the 1491 only references to the symbol are via the global offset table. 1492 For such cases we need not do anything here; the relocations will 1493 be handled correctly by relocate_section. */ 1494 if (info->shared) 1495 return TRUE; 1496 1497 /* If there are no references to this symbol that do not use the 1498 GOT, we don't need to generate a copy reloc. */ 1499 if (!h->non_got_ref) 1500 return TRUE; 1501 1502 /* If -z nocopyreloc was given, we won't generate them either. */ 1503 if (info->nocopyreloc) 1504 { 1505 h->non_got_ref = 0; 1506 return TRUE; 1507 } 1508 1509 htab = elf_i386_hash_table (info); 1510 1511 /* If there aren't any dynamic relocs in read-only sections, then 1512 we can keep the dynamic relocs and avoid the copy reloc. This 1513 doesn't work on VxWorks, where we can not have dynamic relocations 1514 (other than copy and jump slot relocations) in an executable. */ 1515 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks) 1516 { 1517 struct elf_i386_link_hash_entry * eh; 1518 struct elf_i386_dyn_relocs *p; 1519 1520 eh = (struct elf_i386_link_hash_entry *) h; 1521 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1522 { 1523 s = p->sec->output_section; 1524 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1525 break; 1526 } 1527 1528 if (p == NULL) 1529 { 1530 h->non_got_ref = 0; 1531 return TRUE; 1532 } 1533 } 1534 1535 if (h->size == 0) 1536 { 1537 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 1538 h->root.root.string); 1539 return TRUE; 1540 } 1541 1542 /* We must allocate the symbol in our .dynbss section, which will 1543 become part of the .bss section of the executable. There will be 1544 an entry for this symbol in the .dynsym section. The dynamic 1545 object will contain position independent code, so all references 1546 from the dynamic object to this symbol will go through the global 1547 offset table. The dynamic linker will use the .dynsym entry to 1548 determine the address it must put in the global offset table, so 1549 both the dynamic object and the regular object will refer to the 1550 same memory location for the variable. */ 1551 1552 /* We must generate a R_386_COPY reloc to tell the dynamic linker to 1553 copy the initial value out of the dynamic object and into the 1554 runtime process image. */ 1555 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1556 { 1557 htab->srelbss->size += sizeof (Elf32_External_Rel); 1558 h->needs_copy = 1; 1559 } 1560 1561 /* We need to figure out the alignment required for this symbol. I 1562 have no idea how ELF linkers handle this. */ 1563 power_of_two = bfd_log2 (h->size); 1564 if (power_of_two > 3) 1565 power_of_two = 3; 1566 1567 /* Apply the required alignment. */ 1568 s = htab->sdynbss; 1569 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 1570 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) 1571 { 1572 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) 1573 return FALSE; 1574 } 1575 1576 /* Define the symbol as being at this point in the section. */ 1577 h->root.u.def.section = s; 1578 h->root.u.def.value = s->size; 1579 1580 /* Increment the section size to make room for the symbol. */ 1581 s->size += h->size; 1582 1583 return TRUE; 1584 } 1585 1586 /* Allocate space in .plt, .got and associated reloc sections for 1587 dynamic relocs. */ 1588 1589 static bfd_boolean 1590 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) 1591 { 1592 struct bfd_link_info *info; 1593 struct elf_i386_link_hash_table *htab; 1594 struct elf_i386_link_hash_entry *eh; 1595 struct elf_i386_dyn_relocs *p; 1596 1597 if (h->root.type == bfd_link_hash_indirect) 1598 return TRUE; 1599 1600 if (h->root.type == bfd_link_hash_warning) 1601 /* When warning symbols are created, they **replace** the "real" 1602 entry in the hash table, thus we never get to see the real 1603 symbol in a hash traversal. So look at it now. */ 1604 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1605 1606 info = (struct bfd_link_info *) inf; 1607 htab = elf_i386_hash_table (info); 1608 1609 if (htab->elf.dynamic_sections_created 1610 && h->plt.refcount > 0) 1611 { 1612 /* Make sure this symbol is output as a dynamic symbol. 1613 Undefined weak syms won't yet be marked as dynamic. */ 1614 if (h->dynindx == -1 1615 && !h->forced_local) 1616 { 1617 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1618 return FALSE; 1619 } 1620 1621 if (info->shared 1622 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1623 { 1624 asection *s = htab->splt; 1625 1626 /* If this is the first .plt entry, make room for the special 1627 first entry. */ 1628 if (s->size == 0) 1629 s->size += PLT_ENTRY_SIZE; 1630 1631 h->plt.offset = s->size; 1632 1633 /* If this symbol is not defined in a regular file, and we are 1634 not generating a shared library, then set the symbol to this 1635 location in the .plt. This is required to make function 1636 pointers compare as equal between the normal executable and 1637 the shared library. */ 1638 if (! info->shared 1639 && !h->def_regular) 1640 { 1641 h->root.u.def.section = s; 1642 h->root.u.def.value = h->plt.offset; 1643 } 1644 1645 /* Make room for this entry. */ 1646 s->size += PLT_ENTRY_SIZE; 1647 1648 /* We also need to make an entry in the .got.plt section, which 1649 will be placed in the .got section by the linker script. */ 1650 htab->sgotplt->size += 4; 1651 1652 /* We also need to make an entry in the .rel.plt section. */ 1653 htab->srelplt->size += sizeof (Elf32_External_Rel); 1654 htab->next_tls_desc_index++; 1655 1656 if (htab->is_vxworks && !info->shared) 1657 { 1658 /* VxWorks has a second set of relocations for each PLT entry 1659 in executables. They go in a separate relocation section, 1660 which is processed by the kernel loader. */ 1661 1662 /* There are two relocations for the initial PLT entry: an 1663 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an 1664 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ 1665 1666 if (h->plt.offset == PLT_ENTRY_SIZE) 1667 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); 1668 1669 /* There are two extra relocations for each subsequent PLT entry: 1670 an R_386_32 relocation for the GOT entry, and an R_386_32 1671 relocation for the PLT entry. */ 1672 1673 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); 1674 } 1675 } 1676 else 1677 { 1678 h->plt.offset = (bfd_vma) -1; 1679 h->needs_plt = 0; 1680 } 1681 } 1682 else 1683 { 1684 h->plt.offset = (bfd_vma) -1; 1685 h->needs_plt = 0; 1686 } 1687 1688 eh = (struct elf_i386_link_hash_entry *) h; 1689 eh->tlsdesc_got = (bfd_vma) -1; 1690 1691 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary, 1692 make it a R_386_TLS_LE_32 requiring no TLS entry. */ 1693 if (h->got.refcount > 0 1694 && (!info->shared || info->executable) 1695 && h->dynindx == -1 1696 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE)) 1697 h->got.offset = (bfd_vma) -1; 1698 else if (h->got.refcount > 0) 1699 { 1700 asection *s; 1701 bfd_boolean dyn; 1702 int tls_type = elf_i386_hash_entry(h)->tls_type; 1703 1704 /* If we have both R_386_TLS_IE and R_386_TLS_GD, GOT_TLS_IE_BOTH 1705 should be used. */ 1706 if ((tls_type & GOT_TLS_IE_MASK) 1707 == (GOT_TLS_IE_IE | GOT_TLS_IE_GD)) 1708 tls_type = GOT_TLS_IE_BOTH; 1709 else 1710 tls_type &= GOT_TLS_MASK; 1711 1712 /* Make sure this symbol is output as a dynamic symbol. 1713 Undefined weak syms won't yet be marked as dynamic. */ 1714 if (h->dynindx == -1 1715 && !h->forced_local) 1716 { 1717 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1718 return FALSE; 1719 } 1720 1721 s = htab->sgot; 1722 if (GOT_TLS_GDESC_P (tls_type)) 1723 { 1724 eh->tlsdesc_got = htab->sgotplt->size 1725 - elf_i386_compute_jump_table_size (htab); 1726 htab->sgotplt->size += 8; 1727 h->got.offset = (bfd_vma) -2; 1728 } 1729 if (! GOT_TLS_GDESC_P (tls_type) 1730 || GOT_TLS_GD_P (tls_type)) 1731 { 1732 h->got.offset = s->size; 1733 s->size += 4; 1734 /* R_386_TLS_GD needs 2 consecutive GOT slots. */ 1735 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH) 1736 s->size += 4; 1737 } 1738 dyn = htab->elf.dynamic_sections_created; 1739 /* R_386_TLS_IE_32 needs one dynamic relocation, 1740 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, 1741 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we 1742 need two), R_386_TLS_GD needs one if local symbol and two if 1743 global. */ 1744 if (tls_type == GOT_TLS_IE_BOTH) 1745 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel); 1746 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) 1747 || (tls_type & GOT_TLS_IE)) 1748 htab->srelgot->size += sizeof (Elf32_External_Rel); 1749 else if (GOT_TLS_GD_P (tls_type)) 1750 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel); 1751 else if (! GOT_TLS_GDESC_P (tls_type) 1752 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1753 || h->root.type != bfd_link_hash_undefweak) 1754 && (info->shared 1755 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1756 htab->srelgot->size += sizeof (Elf32_External_Rel); 1757 if (GOT_TLS_GDESC_P (tls_type)) 1758 htab->srelplt->size += sizeof (Elf32_External_Rel); 1759 } 1760 else 1761 h->got.offset = (bfd_vma) -1; 1762 1763 if (eh->dyn_relocs == NULL) 1764 return TRUE; 1765 1766 /* In the shared -Bsymbolic case, discard space allocated for 1767 dynamic pc-relative relocs against symbols which turn out to be 1768 defined in regular objects. For the normal shared case, discard 1769 space for pc-relative relocs that have become local due to symbol 1770 visibility changes. */ 1771 1772 if (info->shared) 1773 { 1774 /* The only reloc that uses pc_count is R_386_PC32, which will 1775 appear on a call or on something like ".long foo - .". We 1776 want calls to protected symbols to resolve directly to the 1777 function rather than going via the plt. If people want 1778 function pointer comparisons to work as expected then they 1779 should avoid writing assembly like ".long foo - .". */ 1780 if (SYMBOL_CALLS_LOCAL (info, h)) 1781 { 1782 struct elf_i386_dyn_relocs **pp; 1783 1784 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1785 { 1786 p->count -= p->pc_count; 1787 p->pc_count = 0; 1788 if (p->count == 0) 1789 *pp = p->next; 1790 else 1791 pp = &p->next; 1792 } 1793 } 1794 1795 /* Also discard relocs on undefined weak syms with non-default 1796 visibility. */ 1797 if (eh->dyn_relocs != NULL 1798 && h->root.type == bfd_link_hash_undefweak) 1799 { 1800 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1801 eh->dyn_relocs = NULL; 1802 1803 /* Make sure undefined weak symbols are output as a dynamic 1804 symbol in PIEs. */ 1805 else if (h->dynindx == -1 1806 && !h->forced_local) 1807 { 1808 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1809 return FALSE; 1810 } 1811 } 1812 } 1813 else if (ELIMINATE_COPY_RELOCS) 1814 { 1815 /* For the non-shared case, discard space for relocs against 1816 symbols which turn out to need copy relocs or are not 1817 dynamic. */ 1818 1819 if (!h->non_got_ref 1820 && ((h->def_dynamic 1821 && !h->def_regular) 1822 || (htab->elf.dynamic_sections_created 1823 && (h->root.type == bfd_link_hash_undefweak 1824 || h->root.type == bfd_link_hash_undefined)))) 1825 { 1826 /* Make sure this symbol is output as a dynamic symbol. 1827 Undefined weak syms won't yet be marked as dynamic. */ 1828 if (h->dynindx == -1 1829 && !h->forced_local) 1830 { 1831 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1832 return FALSE; 1833 } 1834 1835 /* If that succeeded, we know we'll be keeping all the 1836 relocs. */ 1837 if (h->dynindx != -1) 1838 goto keep; 1839 } 1840 1841 eh->dyn_relocs = NULL; 1842 1843 keep: ; 1844 } 1845 1846 /* Finally, allocate space. */ 1847 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1848 { 1849 asection *sreloc = elf_section_data (p->sec)->sreloc; 1850 sreloc->size += p->count * sizeof (Elf32_External_Rel); 1851 } 1852 1853 return TRUE; 1854 } 1855 1856 /* Find any dynamic relocs that apply to read-only sections. */ 1857 1858 static bfd_boolean 1859 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) 1860 { 1861 struct elf_i386_link_hash_entry *eh; 1862 struct elf_i386_dyn_relocs *p; 1863 1864 if (h->root.type == bfd_link_hash_warning) 1865 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1866 1867 eh = (struct elf_i386_link_hash_entry *) h; 1868 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1869 { 1870 asection *s = p->sec->output_section; 1871 1872 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1873 { 1874 struct bfd_link_info *info = (struct bfd_link_info *) inf; 1875 1876 info->flags |= DF_TEXTREL; 1877 1878 /* Not an error, just cut short the traversal. */ 1879 return FALSE; 1880 } 1881 } 1882 return TRUE; 1883 } 1884 1885 /* Set the sizes of the dynamic sections. */ 1886 1887 static bfd_boolean 1888 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 1889 struct bfd_link_info *info) 1890 { 1891 struct elf_i386_link_hash_table *htab; 1892 bfd *dynobj; 1893 asection *s; 1894 bfd_boolean relocs; 1895 bfd *ibfd; 1896 1897 htab = elf_i386_hash_table (info); 1898 dynobj = htab->elf.dynobj; 1899 if (dynobj == NULL) 1900 abort (); 1901 1902 if (htab->elf.dynamic_sections_created) 1903 { 1904 /* Set the contents of the .interp section to the interpreter. */ 1905 if (info->executable && !info->static_link) 1906 { 1907 s = bfd_get_section_by_name (dynobj, ".interp"); 1908 if (s == NULL) 1909 abort (); 1910 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1911 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1912 } 1913 } 1914 1915 /* Set up .got offsets for local syms, and space for local dynamic 1916 relocs. */ 1917 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 1918 { 1919 bfd_signed_vma *local_got; 1920 bfd_signed_vma *end_local_got; 1921 char *local_tls_type; 1922 bfd_vma *local_tlsdesc_gotent; 1923 bfd_size_type locsymcount; 1924 Elf_Internal_Shdr *symtab_hdr; 1925 asection *srel; 1926 1927 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 1928 continue; 1929 1930 for (s = ibfd->sections; s != NULL; s = s->next) 1931 { 1932 struct elf_i386_dyn_relocs *p; 1933 1934 for (p = ((struct elf_i386_dyn_relocs *) 1935 elf_section_data (s)->local_dynrel); 1936 p != NULL; 1937 p = p->next) 1938 { 1939 if (!bfd_is_abs_section (p->sec) 1940 && bfd_is_abs_section (p->sec->output_section)) 1941 { 1942 /* Input section has been discarded, either because 1943 it is a copy of a linkonce section or due to 1944 linker script /DISCARD/, so we'll be discarding 1945 the relocs too. */ 1946 } 1947 else if (p->count != 0) 1948 { 1949 srel = elf_section_data (p->sec)->sreloc; 1950 srel->size += p->count * sizeof (Elf32_External_Rel); 1951 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 1952 info->flags |= DF_TEXTREL; 1953 } 1954 } 1955 } 1956 1957 local_got = elf_local_got_refcounts (ibfd); 1958 if (!local_got) 1959 continue; 1960 1961 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 1962 locsymcount = symtab_hdr->sh_info; 1963 end_local_got = local_got + locsymcount; 1964 local_tls_type = elf_i386_local_got_tls_type (ibfd); 1965 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd); 1966 s = htab->sgot; 1967 srel = htab->srelgot; 1968 for (; local_got < end_local_got; 1969 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) 1970 { 1971 *local_tlsdesc_gotent = (bfd_vma) -1; 1972 if (*local_got > 0) 1973 { 1974 if (GOT_TLS_GDESC_P (*local_tls_type)) 1975 { 1976 *local_tlsdesc_gotent = htab->sgotplt->size 1977 - elf_i386_compute_jump_table_size (htab); 1978 htab->sgotplt->size += 8; 1979 *local_got = (bfd_vma) -2; 1980 } 1981 if (! GOT_TLS_GDESC_P (*local_tls_type) 1982 || GOT_TLS_GD_P (*local_tls_type)) 1983 { 1984 *local_got = s->size; 1985 s->size += 4; 1986 if (GOT_TLS_GD_P (*local_tls_type) 1987 || *local_tls_type == GOT_TLS_IE_BOTH) 1988 s->size += 4; 1989 } 1990 if (info->shared 1991 || GOT_TLS_GD_ANY_P (*local_tls_type) 1992 || (*local_tls_type & GOT_TLS_IE)) 1993 { 1994 if (*local_tls_type == GOT_TLS_IE_BOTH) 1995 srel->size += 2 * sizeof (Elf32_External_Rel); 1996 else if (GOT_TLS_GD_P (*local_tls_type) 1997 || ! GOT_TLS_GDESC_P (*local_tls_type)) 1998 srel->size += sizeof (Elf32_External_Rel); 1999 if (GOT_TLS_GDESC_P (*local_tls_type)) 2000 htab->srelplt->size += sizeof (Elf32_External_Rel); 2001 } 2002 } 2003 else 2004 *local_got = (bfd_vma) -1; 2005 } 2006 } 2007 2008 if (htab->tls_ldm_got.refcount > 0) 2009 { 2010 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM 2011 relocs. */ 2012 htab->tls_ldm_got.offset = htab->sgot->size; 2013 htab->sgot->size += 8; 2014 htab->srelgot->size += sizeof (Elf32_External_Rel); 2015 } 2016 else 2017 htab->tls_ldm_got.offset = -1; 2018 2019 /* Allocate global sym .plt and .got entries, and space for global 2020 sym dynamic relocs. */ 2021 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); 2022 2023 /* For every jump slot reserved in the sgotplt, reloc_count is 2024 incremented. However, when we reserve space for TLS descriptors, 2025 it's not incremented, so in order to compute the space reserved 2026 for them, it suffices to multiply the reloc count by the jump 2027 slot size. */ 2028 if (htab->srelplt) 2029 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4; 2030 2031 /* We now have determined the sizes of the various dynamic sections. 2032 Allocate memory for them. */ 2033 relocs = FALSE; 2034 for (s = dynobj->sections; s != NULL; s = s->next) 2035 { 2036 bfd_boolean strip_section = TRUE; 2037 2038 if ((s->flags & SEC_LINKER_CREATED) == 0) 2039 continue; 2040 2041 if (s == htab->splt 2042 || s == htab->sgot 2043 || s == htab->sgotplt 2044 || s == htab->sdynbss) 2045 { 2046 /* Strip this section if we don't need it; see the 2047 comment below. */ 2048 /* We'd like to strip these sections if they aren't needed, but if 2049 we've exported dynamic symbols from them we must leave them. 2050 It's too late to tell BFD to get rid of the symbols. */ 2051 2052 if (htab->elf.hplt != NULL) 2053 strip_section = FALSE; 2054 } 2055 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0) 2056 { 2057 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2) 2058 relocs = TRUE; 2059 2060 /* We use the reloc_count field as a counter if we need 2061 to copy relocs into the output file. */ 2062 s->reloc_count = 0; 2063 } 2064 else 2065 { 2066 /* It's not one of our sections, so don't allocate space. */ 2067 continue; 2068 } 2069 2070 if (s->size == 0) 2071 { 2072 /* If we don't need this section, strip it from the 2073 output file. This is mostly to handle .rel.bss and 2074 .rel.plt. We must create both sections in 2075 create_dynamic_sections, because they must be created 2076 before the linker maps input sections to output 2077 sections. The linker does that before 2078 adjust_dynamic_symbol is called, and it is that 2079 function which decides whether anything needs to go 2080 into these sections. */ 2081 if (strip_section) 2082 s->flags |= SEC_EXCLUDE; 2083 continue; 2084 } 2085 2086 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2087 continue; 2088 2089 /* Allocate memory for the section contents. We use bfd_zalloc 2090 here in case unused entries are not reclaimed before the 2091 section's contents are written out. This should not happen, 2092 but this way if it does, we get a R_386_NONE reloc instead 2093 of garbage. */ 2094 s->contents = bfd_zalloc (dynobj, s->size); 2095 if (s->contents == NULL) 2096 return FALSE; 2097 } 2098 2099 if (htab->elf.dynamic_sections_created) 2100 { 2101 /* Add some entries to the .dynamic section. We fill in the 2102 values later, in elf_i386_finish_dynamic_sections, but we 2103 must add the entries now so that we get the correct size for 2104 the .dynamic section. The DT_DEBUG entry is filled in by the 2105 dynamic linker and used by the debugger. */ 2106 #define add_dynamic_entry(TAG, VAL) \ 2107 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2108 2109 if (info->executable) 2110 { 2111 if (!add_dynamic_entry (DT_DEBUG, 0)) 2112 return FALSE; 2113 } 2114 2115 if (htab->splt->size != 0) 2116 { 2117 if (!add_dynamic_entry (DT_PLTGOT, 0) 2118 || !add_dynamic_entry (DT_PLTRELSZ, 0) 2119 || !add_dynamic_entry (DT_PLTREL, DT_REL) 2120 || !add_dynamic_entry (DT_JMPREL, 0)) 2121 return FALSE; 2122 } 2123 2124 if (relocs) 2125 { 2126 if (!add_dynamic_entry (DT_REL, 0) 2127 || !add_dynamic_entry (DT_RELSZ, 0) 2128 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) 2129 return FALSE; 2130 2131 /* If any dynamic relocs apply to a read-only section, 2132 then we need a DT_TEXTREL entry. */ 2133 if ((info->flags & DF_TEXTREL) == 0) 2134 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, 2135 (PTR) info); 2136 2137 if ((info->flags & DF_TEXTREL) != 0) 2138 { 2139 if (!add_dynamic_entry (DT_TEXTREL, 0)) 2140 return FALSE; 2141 } 2142 } 2143 } 2144 #undef add_dynamic_entry 2145 2146 return TRUE; 2147 } 2148 2149 static bfd_boolean 2150 elf_i386_always_size_sections (bfd *output_bfd, 2151 struct bfd_link_info *info) 2152 { 2153 asection *tls_sec = elf_hash_table (info)->tls_sec; 2154 2155 if (tls_sec) 2156 { 2157 struct elf_link_hash_entry *tlsbase; 2158 2159 tlsbase = elf_link_hash_lookup (elf_hash_table (info), 2160 "_TLS_MODULE_BASE_", 2161 FALSE, FALSE, FALSE); 2162 2163 if (tlsbase && tlsbase->type == STT_TLS) 2164 { 2165 struct bfd_link_hash_entry *bh = NULL; 2166 const struct elf_backend_data *bed 2167 = get_elf_backend_data (output_bfd); 2168 2169 if (!(_bfd_generic_link_add_one_symbol 2170 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, 2171 tls_sec, 0, NULL, FALSE, 2172 bed->collect, &bh))) 2173 return FALSE; 2174 tlsbase = (struct elf_link_hash_entry *)bh; 2175 tlsbase->def_regular = 1; 2176 tlsbase->other = STV_HIDDEN; 2177 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); 2178 } 2179 } 2180 2181 return TRUE; 2182 } 2183 2184 /* Set the correct type for an x86 ELF section. We do this by the 2185 section name, which is a hack, but ought to work. */ 2186 2187 static bfd_boolean 2188 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, 2189 Elf_Internal_Shdr *hdr, 2190 asection *sec) 2191 { 2192 register const char *name; 2193 2194 name = bfd_get_section_name (abfd, sec); 2195 2196 /* This is an ugly, but unfortunately necessary hack that is 2197 needed when producing EFI binaries on x86. It tells 2198 elf.c:elf_fake_sections() not to consider ".reloc" as a section 2199 containing ELF relocation info. We need this hack in order to 2200 be able to generate ELF binaries that can be translated into 2201 EFI applications (which are essentially COFF objects). Those 2202 files contain a COFF ".reloc" section inside an ELFNN object, 2203 which would normally cause BFD to segfault because it would 2204 attempt to interpret this section as containing relocation 2205 entries for section "oc". With this hack enabled, ".reloc" 2206 will be treated as a normal data section, which will avoid the 2207 segfault. However, you won't be able to create an ELFNN binary 2208 with a section named "oc" that needs relocations, but that's 2209 the kind of ugly side-effects you get when detecting section 2210 types based on their names... In practice, this limitation is 2211 unlikely to bite. */ 2212 if (strcmp (name, ".reloc") == 0) 2213 hdr->sh_type = SHT_PROGBITS; 2214 2215 return TRUE; 2216 } 2217 2218 /* Return the base VMA address which should be subtracted from real addresses 2219 when resolving @dtpoff relocation. 2220 This is PT_TLS segment p_vaddr. */ 2221 2222 static bfd_vma 2223 dtpoff_base (struct bfd_link_info *info) 2224 { 2225 /* If tls_sec is NULL, we should have signalled an error already. */ 2226 if (elf_hash_table (info)->tls_sec == NULL) 2227 return 0; 2228 return elf_hash_table (info)->tls_sec->vma; 2229 } 2230 2231 /* Return the relocation value for @tpoff relocation 2232 if STT_TLS virtual address is ADDRESS. */ 2233 2234 static bfd_vma 2235 tpoff (struct bfd_link_info *info, bfd_vma address) 2236 { 2237 struct elf_link_hash_table *htab = elf_hash_table (info); 2238 2239 /* If tls_sec is NULL, we should have signalled an error already. */ 2240 if (htab->tls_sec == NULL) 2241 return 0; 2242 return htab->tls_size + htab->tls_sec->vma - address; 2243 } 2244 2245 /* Relocate an i386 ELF section. */ 2246 2247 static bfd_boolean 2248 elf_i386_relocate_section (bfd *output_bfd, 2249 struct bfd_link_info *info, 2250 bfd *input_bfd, 2251 asection *input_section, 2252 bfd_byte *contents, 2253 Elf_Internal_Rela *relocs, 2254 Elf_Internal_Sym *local_syms, 2255 asection **local_sections) 2256 { 2257 struct elf_i386_link_hash_table *htab; 2258 Elf_Internal_Shdr *symtab_hdr; 2259 struct elf_link_hash_entry **sym_hashes; 2260 bfd_vma *local_got_offsets; 2261 bfd_vma *local_tlsdesc_gotents; 2262 Elf_Internal_Rela *rel; 2263 Elf_Internal_Rela *relend; 2264 2265 htab = elf_i386_hash_table (info); 2266 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2267 sym_hashes = elf_sym_hashes (input_bfd); 2268 local_got_offsets = elf_local_got_offsets (input_bfd); 2269 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd); 2270 2271 rel = relocs; 2272 relend = relocs + input_section->reloc_count; 2273 for (; rel < relend; rel++) 2274 { 2275 unsigned int r_type; 2276 reloc_howto_type *howto; 2277 unsigned long r_symndx; 2278 struct elf_link_hash_entry *h; 2279 Elf_Internal_Sym *sym; 2280 asection *sec; 2281 bfd_vma off, offplt; 2282 bfd_vma relocation; 2283 bfd_boolean unresolved_reloc; 2284 bfd_reloc_status_type r; 2285 unsigned int indx; 2286 int tls_type; 2287 2288 r_type = ELF32_R_TYPE (rel->r_info); 2289 if (r_type == R_386_GNU_VTINHERIT 2290 || r_type == R_386_GNU_VTENTRY) 2291 continue; 2292 2293 if ((indx = r_type) >= R_386_standard 2294 && ((indx = r_type - R_386_ext_offset) - R_386_standard 2295 >= R_386_ext - R_386_standard) 2296 && ((indx = r_type - R_386_tls_offset) - R_386_ext 2297 >= R_386_tls - R_386_ext)) 2298 { 2299 (*_bfd_error_handler) 2300 (_("%B: unrecognized relocation (0x%x) in section `%A'"), 2301 input_bfd, input_section, r_type); 2302 bfd_set_error (bfd_error_bad_value); 2303 return FALSE; 2304 } 2305 howto = elf_howto_table + indx; 2306 2307 r_symndx = ELF32_R_SYM (rel->r_info); 2308 2309 if (info->relocatable) 2310 { 2311 bfd_vma val; 2312 bfd_byte *where; 2313 2314 /* This is a relocatable link. We don't have to change 2315 anything, unless the reloc is against a section symbol, 2316 in which case we have to adjust according to where the 2317 section symbol winds up in the output section. */ 2318 if (r_symndx >= symtab_hdr->sh_info) 2319 continue; 2320 2321 sym = local_syms + r_symndx; 2322 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) 2323 continue; 2324 2325 sec = local_sections[r_symndx]; 2326 val = sec->output_offset; 2327 if (val == 0) 2328 continue; 2329 2330 where = contents + rel->r_offset; 2331 switch (howto->size) 2332 { 2333 /* FIXME: overflow checks. */ 2334 case 0: 2335 val += bfd_get_8 (input_bfd, where); 2336 bfd_put_8 (input_bfd, val, where); 2337 break; 2338 case 1: 2339 val += bfd_get_16 (input_bfd, where); 2340 bfd_put_16 (input_bfd, val, where); 2341 break; 2342 case 2: 2343 val += bfd_get_32 (input_bfd, where); 2344 bfd_put_32 (input_bfd, val, where); 2345 break; 2346 default: 2347 abort (); 2348 } 2349 continue; 2350 } 2351 2352 /* This is a final link. */ 2353 h = NULL; 2354 sym = NULL; 2355 sec = NULL; 2356 unresolved_reloc = FALSE; 2357 if (r_symndx < symtab_hdr->sh_info) 2358 { 2359 sym = local_syms + r_symndx; 2360 sec = local_sections[r_symndx]; 2361 relocation = (sec->output_section->vma 2362 + sec->output_offset 2363 + sym->st_value); 2364 if ((sec->flags & SEC_MERGE) 2365 && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 2366 { 2367 asection *msec; 2368 bfd_vma addend; 2369 bfd_byte *where = contents + rel->r_offset; 2370 2371 switch (howto->size) 2372 { 2373 case 0: 2374 addend = bfd_get_8 (input_bfd, where); 2375 if (howto->pc_relative) 2376 { 2377 addend = (addend ^ 0x80) - 0x80; 2378 addend += 1; 2379 } 2380 break; 2381 case 1: 2382 addend = bfd_get_16 (input_bfd, where); 2383 if (howto->pc_relative) 2384 { 2385 addend = (addend ^ 0x8000) - 0x8000; 2386 addend += 2; 2387 } 2388 break; 2389 case 2: 2390 addend = bfd_get_32 (input_bfd, where); 2391 if (howto->pc_relative) 2392 { 2393 addend = (addend ^ 0x80000000) - 0x80000000; 2394 addend += 4; 2395 } 2396 break; 2397 default: 2398 abort (); 2399 } 2400 2401 msec = sec; 2402 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend); 2403 addend -= relocation; 2404 addend += msec->output_section->vma + msec->output_offset; 2405 2406 switch (howto->size) 2407 { 2408 case 0: 2409 /* FIXME: overflow checks. */ 2410 if (howto->pc_relative) 2411 addend -= 1; 2412 bfd_put_8 (input_bfd, addend, where); 2413 break; 2414 case 1: 2415 if (howto->pc_relative) 2416 addend -= 2; 2417 bfd_put_16 (input_bfd, addend, where); 2418 break; 2419 case 2: 2420 if (howto->pc_relative) 2421 addend -= 4; 2422 bfd_put_32 (input_bfd, addend, where); 2423 break; 2424 } 2425 } 2426 } 2427 else 2428 { 2429 bfd_boolean warned; 2430 2431 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2432 r_symndx, symtab_hdr, sym_hashes, 2433 h, sec, relocation, 2434 unresolved_reloc, warned); 2435 } 2436 2437 if (r_symndx == 0) 2438 { 2439 /* r_symndx will be zero only for relocs against symbols from 2440 removed linkonce sections, or sections discarded by a linker 2441 script. For these relocs, we just want the section contents 2442 zeroed. Avoid any special processing in the switch below. */ 2443 r_type = R_386_NONE; 2444 2445 relocation = 0; 2446 if (howto->pc_relative) 2447 relocation = (input_section->output_section->vma 2448 + input_section->output_offset 2449 + rel->r_offset); 2450 } 2451 2452 switch (r_type) 2453 { 2454 case R_386_GOT32: 2455 /* Relocation is to the entry for this symbol in the global 2456 offset table. */ 2457 if (htab->sgot == NULL) 2458 abort (); 2459 2460 if (h != NULL) 2461 { 2462 bfd_boolean dyn; 2463 2464 off = h->got.offset; 2465 dyn = htab->elf.dynamic_sections_created; 2466 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2467 || (info->shared 2468 && SYMBOL_REFERENCES_LOCAL (info, h)) 2469 || (ELF_ST_VISIBILITY (h->other) 2470 && h->root.type == bfd_link_hash_undefweak)) 2471 { 2472 /* This is actually a static link, or it is a 2473 -Bsymbolic link and the symbol is defined 2474 locally, or the symbol was forced to be local 2475 because of a version file. We must initialize 2476 this entry in the global offset table. Since the 2477 offset must always be a multiple of 4, we use the 2478 least significant bit to record whether we have 2479 initialized it already. 2480 2481 When doing a dynamic link, we create a .rel.got 2482 relocation entry to initialize the value. This 2483 is done in the finish_dynamic_symbol routine. */ 2484 if ((off & 1) != 0) 2485 off &= ~1; 2486 else 2487 { 2488 bfd_put_32 (output_bfd, relocation, 2489 htab->sgot->contents + off); 2490 h->got.offset |= 1; 2491 } 2492 } 2493 else 2494 unresolved_reloc = FALSE; 2495 } 2496 else 2497 { 2498 if (local_got_offsets == NULL) 2499 abort (); 2500 2501 off = local_got_offsets[r_symndx]; 2502 2503 /* The offset must always be a multiple of 4. We use 2504 the least significant bit to record whether we have 2505 already generated the necessary reloc. */ 2506 if ((off & 1) != 0) 2507 off &= ~1; 2508 else 2509 { 2510 bfd_put_32 (output_bfd, relocation, 2511 htab->sgot->contents + off); 2512 2513 if (info->shared) 2514 { 2515 asection *s; 2516 Elf_Internal_Rela outrel; 2517 bfd_byte *loc; 2518 2519 s = htab->srelgot; 2520 if (s == NULL) 2521 abort (); 2522 2523 outrel.r_offset = (htab->sgot->output_section->vma 2524 + htab->sgot->output_offset 2525 + off); 2526 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2527 loc = s->contents; 2528 loc += s->reloc_count++ * sizeof (Elf32_External_Rel); 2529 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2530 } 2531 2532 local_got_offsets[r_symndx] |= 1; 2533 } 2534 } 2535 2536 if (off >= (bfd_vma) -2) 2537 abort (); 2538 2539 relocation = htab->sgot->output_section->vma 2540 + htab->sgot->output_offset + off 2541 - htab->sgotplt->output_section->vma 2542 - htab->sgotplt->output_offset; 2543 break; 2544 2545 case R_386_GOTOFF: 2546 /* Relocation is relative to the start of the global offset 2547 table. */ 2548 2549 /* Check to make sure it isn't a protected function symbol 2550 for shared library since it may not be local when used 2551 as function address. */ 2552 if (info->shared 2553 && !info->executable 2554 && h 2555 && h->def_regular 2556 && h->type == STT_FUNC 2557 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) 2558 { 2559 (*_bfd_error_handler) 2560 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"), 2561 input_bfd, h->root.root.string); 2562 bfd_set_error (bfd_error_bad_value); 2563 return FALSE; 2564 } 2565 2566 /* Note that sgot is not involved in this 2567 calculation. We always want the start of .got.plt. If we 2568 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is 2569 permitted by the ABI, we might have to change this 2570 calculation. */ 2571 relocation -= htab->sgotplt->output_section->vma 2572 + htab->sgotplt->output_offset; 2573 break; 2574 2575 case R_386_GOTPC: 2576 /* Use global offset table as symbol value. */ 2577 relocation = htab->sgotplt->output_section->vma 2578 + htab->sgotplt->output_offset; 2579 unresolved_reloc = FALSE; 2580 break; 2581 2582 case R_386_PLT32: 2583 /* Relocation is to the entry for this symbol in the 2584 procedure linkage table. */ 2585 2586 /* Resolve a PLT32 reloc against a local symbol directly, 2587 without using the procedure linkage table. */ 2588 if (h == NULL) 2589 break; 2590 2591 if (h->plt.offset == (bfd_vma) -1 2592 || htab->splt == NULL) 2593 { 2594 /* We didn't make a PLT entry for this symbol. This 2595 happens when statically linking PIC code, or when 2596 using -Bsymbolic. */ 2597 break; 2598 } 2599 2600 relocation = (htab->splt->output_section->vma 2601 + htab->splt->output_offset 2602 + h->plt.offset); 2603 unresolved_reloc = FALSE; 2604 break; 2605 2606 case R_386_32: 2607 case R_386_PC32: 2608 if ((input_section->flags & SEC_ALLOC) == 0) 2609 break; 2610 2611 if ((info->shared 2612 && (h == NULL 2613 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2614 || h->root.type != bfd_link_hash_undefweak) 2615 && (r_type != R_386_PC32 2616 || !SYMBOL_CALLS_LOCAL (info, h))) 2617 || (ELIMINATE_COPY_RELOCS 2618 && !info->shared 2619 && h != NULL 2620 && h->dynindx != -1 2621 && !h->non_got_ref 2622 && ((h->def_dynamic 2623 && !h->def_regular) 2624 || h->root.type == bfd_link_hash_undefweak 2625 || h->root.type == bfd_link_hash_undefined))) 2626 { 2627 Elf_Internal_Rela outrel; 2628 bfd_byte *loc; 2629 bfd_boolean skip, relocate; 2630 asection *sreloc; 2631 2632 /* When generating a shared object, these relocations 2633 are copied into the output file to be resolved at run 2634 time. */ 2635 2636 skip = FALSE; 2637 relocate = FALSE; 2638 2639 outrel.r_offset = 2640 _bfd_elf_section_offset (output_bfd, info, input_section, 2641 rel->r_offset); 2642 if (outrel.r_offset == (bfd_vma) -1) 2643 skip = TRUE; 2644 else if (outrel.r_offset == (bfd_vma) -2) 2645 skip = TRUE, relocate = TRUE; 2646 outrel.r_offset += (input_section->output_section->vma 2647 + input_section->output_offset); 2648 2649 if (skip) 2650 memset (&outrel, 0, sizeof outrel); 2651 else if (h != NULL 2652 && h->dynindx != -1 2653 && (r_type == R_386_PC32 2654 || !info->shared 2655 || !info->symbolic 2656 || !h->def_regular)) 2657 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2658 else 2659 { 2660 /* This symbol is local, or marked to become local. */ 2661 relocate = TRUE; 2662 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2663 } 2664 2665 sreloc = elf_section_data (input_section)->sreloc; 2666 if (sreloc == NULL) 2667 abort (); 2668 2669 loc = sreloc->contents; 2670 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 2671 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2672 2673 /* If this reloc is against an external symbol, we do 2674 not want to fiddle with the addend. Otherwise, we 2675 need to include the symbol value so that it becomes 2676 an addend for the dynamic reloc. */ 2677 if (! relocate) 2678 continue; 2679 } 2680 break; 2681 2682 case R_386_TLS_IE: 2683 if (info->shared) 2684 { 2685 Elf_Internal_Rela outrel; 2686 bfd_byte *loc; 2687 asection *sreloc; 2688 2689 outrel.r_offset = rel->r_offset 2690 + input_section->output_section->vma 2691 + input_section->output_offset; 2692 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2693 sreloc = elf_section_data (input_section)->sreloc; 2694 if (sreloc == NULL) 2695 abort (); 2696 loc = sreloc->contents; 2697 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 2698 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2699 } 2700 /* Fall through */ 2701 2702 case R_386_TLS_GD: 2703 case R_386_TLS_GOTDESC: 2704 case R_386_TLS_DESC_CALL: 2705 case R_386_TLS_IE_32: 2706 case R_386_TLS_GOTIE: 2707 r_type = elf_i386_tls_transition (info, r_type, h == NULL); 2708 tls_type = GOT_UNKNOWN; 2709 if (h == NULL && local_got_offsets) 2710 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx]; 2711 else if (h != NULL) 2712 { 2713 tls_type = elf_i386_hash_entry(h)->tls_type; 2714 /* If we have both R_386_TLS_IE and R_386_TLS_GD, 2715 GOT_TLS_IE_BOTH should be used. */ 2716 if ((tls_type & GOT_TLS_IE_MASK) 2717 == (GOT_TLS_IE_IE | GOT_TLS_IE_GD)) 2718 tls_type = GOT_TLS_IE_BOTH; 2719 else 2720 tls_type &= GOT_TLS_MASK; 2721 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE)) 2722 r_type = R_386_TLS_LE_32; 2723 } 2724 if (tls_type == GOT_TLS_IE) 2725 tls_type = GOT_TLS_IE_NEG; 2726 if (r_type == R_386_TLS_GD 2727 || r_type == R_386_TLS_GOTDESC 2728 || r_type == R_386_TLS_DESC_CALL) 2729 { 2730 if (tls_type == GOT_TLS_IE_POS) 2731 r_type = R_386_TLS_GOTIE; 2732 else if (tls_type & GOT_TLS_IE) 2733 r_type = R_386_TLS_IE_32; 2734 } 2735 2736 if (r_type == R_386_TLS_LE_32) 2737 { 2738 BFD_ASSERT (! unresolved_reloc); 2739 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) 2740 { 2741 unsigned int val, type; 2742 bfd_vma roff; 2743 2744 /* GD->LE transition. */ 2745 BFD_ASSERT (rel->r_offset >= 2); 2746 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 2747 BFD_ASSERT (type == 0x8d || type == 0x04); 2748 BFD_ASSERT (rel->r_offset + 9 <= input_section->size); 2749 BFD_ASSERT (bfd_get_8 (input_bfd, 2750 contents + rel->r_offset + 4) 2751 == 0xe8); 2752 BFD_ASSERT (rel + 1 < relend); 2753 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 2754 roff = rel->r_offset + 5; 2755 val = bfd_get_8 (input_bfd, 2756 contents + rel->r_offset - 1); 2757 if (type == 0x04) 2758 { 2759 /* leal foo(,%reg,1), %eax; call ___tls_get_addr 2760 Change it into: 2761 movl %gs:0, %eax; subl $foo@tpoff, %eax 2762 (6 byte form of subl). */ 2763 BFD_ASSERT (rel->r_offset >= 3); 2764 BFD_ASSERT (bfd_get_8 (input_bfd, 2765 contents + rel->r_offset - 3) 2766 == 0x8d); 2767 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); 2768 memcpy (contents + rel->r_offset - 3, 2769 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); 2770 } 2771 else 2772 { 2773 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); 2774 if (rel->r_offset + 10 <= input_section->size 2775 && bfd_get_8 (input_bfd, 2776 contents + rel->r_offset + 9) == 0x90) 2777 { 2778 /* leal foo(%reg), %eax; call ___tls_get_addr; nop 2779 Change it into: 2780 movl %gs:0, %eax; subl $foo@tpoff, %eax 2781 (6 byte form of subl). */ 2782 memcpy (contents + rel->r_offset - 2, 2783 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); 2784 roff = rel->r_offset + 6; 2785 } 2786 else 2787 { 2788 /* leal foo(%reg), %eax; call ___tls_get_addr 2789 Change it into: 2790 movl %gs:0, %eax; subl $foo@tpoff, %eax 2791 (5 byte form of subl). */ 2792 memcpy (contents + rel->r_offset - 2, 2793 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); 2794 } 2795 } 2796 bfd_put_32 (output_bfd, tpoff (info, relocation), 2797 contents + roff); 2798 /* Skip R_386_PLT32. */ 2799 rel++; 2800 continue; 2801 } 2802 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) 2803 { 2804 /* GDesc -> LE transition. 2805 It's originally something like: 2806 leal x@tlsdesc(%ebx), %eax 2807 2808 leal x@ntpoff, %eax 2809 2810 Registers other than %eax may be set up here. */ 2811 2812 unsigned int val, type; 2813 bfd_vma roff; 2814 2815 /* First, make sure it's a leal adding ebx to a 2816 32-bit offset into any register, although it's 2817 probably almost always going to be eax. */ 2818 roff = rel->r_offset; 2819 BFD_ASSERT (roff >= 2); 2820 type = bfd_get_8 (input_bfd, contents + roff - 2); 2821 BFD_ASSERT (type == 0x8d); 2822 val = bfd_get_8 (input_bfd, contents + roff - 1); 2823 BFD_ASSERT ((val & 0xc7) == 0x83); 2824 BFD_ASSERT (roff + 4 <= input_section->size); 2825 2826 /* Now modify the instruction as appropriate. */ 2827 /* aoliva FIXME: remove the above and xor the byte 2828 below with 0x86. */ 2829 bfd_put_8 (output_bfd, val ^ 0x86, 2830 contents + roff - 1); 2831 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2832 contents + roff); 2833 continue; 2834 } 2835 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) 2836 { 2837 /* GDesc -> LE transition. 2838 It's originally: 2839 call *(%eax) 2840 Turn it into: 2841 nop; nop */ 2842 2843 unsigned int val, type; 2844 bfd_vma roff; 2845 2846 /* First, make sure it's a call *(%eax). */ 2847 roff = rel->r_offset; 2848 BFD_ASSERT (roff + 2 <= input_section->size); 2849 type = bfd_get_8 (input_bfd, contents + roff); 2850 BFD_ASSERT (type == 0xff); 2851 val = bfd_get_8 (input_bfd, contents + roff + 1); 2852 BFD_ASSERT (val == 0x10); 2853 2854 /* Now modify the instruction as appropriate. */ 2855 bfd_put_8 (output_bfd, 0x90, contents + roff); 2856 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 2857 continue; 2858 } 2859 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE) 2860 { 2861 unsigned int val, type; 2862 2863 /* IE->LE transition: 2864 Originally it can be one of: 2865 movl foo, %eax 2866 movl foo, %reg 2867 addl foo, %reg 2868 We change it into: 2869 movl $foo, %eax 2870 movl $foo, %reg 2871 addl $foo, %reg. */ 2872 BFD_ASSERT (rel->r_offset >= 1); 2873 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2874 BFD_ASSERT (rel->r_offset + 4 <= input_section->size); 2875 if (val == 0xa1) 2876 { 2877 /* movl foo, %eax. */ 2878 bfd_put_8 (output_bfd, 0xb8, 2879 contents + rel->r_offset - 1); 2880 } 2881 else 2882 { 2883 BFD_ASSERT (rel->r_offset >= 2); 2884 type = bfd_get_8 (input_bfd, 2885 contents + rel->r_offset - 2); 2886 switch (type) 2887 { 2888 case 0x8b: 2889 /* movl */ 2890 BFD_ASSERT ((val & 0xc7) == 0x05); 2891 bfd_put_8 (output_bfd, 0xc7, 2892 contents + rel->r_offset - 2); 2893 bfd_put_8 (output_bfd, 2894 0xc0 | ((val >> 3) & 7), 2895 contents + rel->r_offset - 1); 2896 break; 2897 case 0x03: 2898 /* addl */ 2899 BFD_ASSERT ((val & 0xc7) == 0x05); 2900 bfd_put_8 (output_bfd, 0x81, 2901 contents + rel->r_offset - 2); 2902 bfd_put_8 (output_bfd, 2903 0xc0 | ((val >> 3) & 7), 2904 contents + rel->r_offset - 1); 2905 break; 2906 default: 2907 BFD_FAIL (); 2908 break; 2909 } 2910 } 2911 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2912 contents + rel->r_offset); 2913 continue; 2914 } 2915 else 2916 { 2917 unsigned int val, type; 2918 2919 /* {IE_32,GOTIE}->LE transition: 2920 Originally it can be one of: 2921 subl foo(%reg1), %reg2 2922 movl foo(%reg1), %reg2 2923 addl foo(%reg1), %reg2 2924 We change it into: 2925 subl $foo, %reg2 2926 movl $foo, %reg2 (6 byte form) 2927 addl $foo, %reg2. */ 2928 BFD_ASSERT (rel->r_offset >= 2); 2929 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 2930 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2931 BFD_ASSERT (rel->r_offset + 4 <= input_section->size); 2932 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4); 2933 if (type == 0x8b) 2934 { 2935 /* movl */ 2936 bfd_put_8 (output_bfd, 0xc7, 2937 contents + rel->r_offset - 2); 2938 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 2939 contents + rel->r_offset - 1); 2940 } 2941 else if (type == 0x2b) 2942 { 2943 /* subl */ 2944 bfd_put_8 (output_bfd, 0x81, 2945 contents + rel->r_offset - 2); 2946 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), 2947 contents + rel->r_offset - 1); 2948 } 2949 else if (type == 0x03) 2950 { 2951 /* addl */ 2952 bfd_put_8 (output_bfd, 0x81, 2953 contents + rel->r_offset - 2); 2954 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 2955 contents + rel->r_offset - 1); 2956 } 2957 else 2958 BFD_FAIL (); 2959 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE) 2960 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2961 contents + rel->r_offset); 2962 else 2963 bfd_put_32 (output_bfd, tpoff (info, relocation), 2964 contents + rel->r_offset); 2965 continue; 2966 } 2967 } 2968 2969 if (htab->sgot == NULL) 2970 abort (); 2971 2972 if (h != NULL) 2973 { 2974 off = h->got.offset; 2975 offplt = elf_i386_hash_entry (h)->tlsdesc_got; 2976 } 2977 else 2978 { 2979 if (local_got_offsets == NULL) 2980 abort (); 2981 2982 off = local_got_offsets[r_symndx]; 2983 offplt = local_tlsdesc_gotents[r_symndx]; 2984 } 2985 2986 if ((off & 1) != 0) 2987 off &= ~1; 2988 else 2989 { 2990 Elf_Internal_Rela outrel; 2991 bfd_byte *loc; 2992 int dr_type, indx; 2993 asection *sreloc; 2994 2995 if (htab->srelgot == NULL) 2996 abort (); 2997 2998 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2999 3000 if (GOT_TLS_GDESC_P (tls_type)) 3001 { 3002 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC); 3003 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8 3004 <= htab->sgotplt->size); 3005 outrel.r_offset = (htab->sgotplt->output_section->vma 3006 + htab->sgotplt->output_offset 3007 + offplt 3008 + htab->sgotplt_jump_table_size); 3009 sreloc = htab->srelplt; 3010 loc = sreloc->contents; 3011 loc += (htab->next_tls_desc_index++ 3012 * sizeof (Elf32_External_Rel)); 3013 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 3014 <= sreloc->contents + sreloc->size); 3015 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3016 if (indx == 0) 3017 { 3018 BFD_ASSERT (! unresolved_reloc); 3019 bfd_put_32 (output_bfd, 3020 relocation - dtpoff_base (info), 3021 htab->sgotplt->contents + offplt 3022 + htab->sgotplt_jump_table_size + 4); 3023 } 3024 else 3025 { 3026 bfd_put_32 (output_bfd, 0, 3027 htab->sgotplt->contents + offplt 3028 + htab->sgotplt_jump_table_size + 4); 3029 } 3030 } 3031 3032 sreloc = htab->srelgot; 3033 3034 outrel.r_offset = (htab->sgot->output_section->vma 3035 + htab->sgot->output_offset + off); 3036 3037 if (GOT_TLS_GD_P (tls_type)) 3038 dr_type = R_386_TLS_DTPMOD32; 3039 else if (GOT_TLS_GDESC_P (tls_type)) 3040 goto dr_done; 3041 else if (tls_type == GOT_TLS_IE_POS) 3042 dr_type = R_386_TLS_TPOFF; 3043 else 3044 dr_type = R_386_TLS_TPOFF32; 3045 3046 if (dr_type == R_386_TLS_TPOFF && indx == 0) 3047 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 3048 htab->sgot->contents + off); 3049 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) 3050 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation, 3051 htab->sgot->contents + off); 3052 else if (dr_type != R_386_TLS_DESC) 3053 bfd_put_32 (output_bfd, 0, 3054 htab->sgot->contents + off); 3055 outrel.r_info = ELF32_R_INFO (indx, dr_type); 3056 3057 loc = sreloc->contents; 3058 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 3059 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 3060 <= sreloc->contents + sreloc->size); 3061 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3062 3063 if (GOT_TLS_GD_P (tls_type)) 3064 { 3065 if (indx == 0) 3066 { 3067 BFD_ASSERT (! unresolved_reloc); 3068 bfd_put_32 (output_bfd, 3069 relocation - dtpoff_base (info), 3070 htab->sgot->contents + off + 4); 3071 } 3072 else 3073 { 3074 bfd_put_32 (output_bfd, 0, 3075 htab->sgot->contents + off + 4); 3076 outrel.r_info = ELF32_R_INFO (indx, 3077 R_386_TLS_DTPOFF32); 3078 outrel.r_offset += 4; 3079 sreloc->reloc_count++; 3080 loc += sizeof (Elf32_External_Rel); 3081 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 3082 <= sreloc->contents + sreloc->size); 3083 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3084 } 3085 } 3086 else if (tls_type == GOT_TLS_IE_BOTH) 3087 { 3088 bfd_put_32 (output_bfd, 3089 indx == 0 ? relocation - dtpoff_base (info) : 0, 3090 htab->sgot->contents + off + 4); 3091 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 3092 outrel.r_offset += 4; 3093 sreloc->reloc_count++; 3094 loc += sizeof (Elf32_External_Rel); 3095 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3096 } 3097 3098 dr_done: 3099 if (h != NULL) 3100 h->got.offset |= 1; 3101 else 3102 local_got_offsets[r_symndx] |= 1; 3103 } 3104 3105 if (off >= (bfd_vma) -2 3106 && ! GOT_TLS_GDESC_P (tls_type)) 3107 abort (); 3108 if (r_type == R_386_TLS_GOTDESC 3109 || r_type == R_386_TLS_DESC_CALL) 3110 { 3111 relocation = htab->sgotplt_jump_table_size + offplt; 3112 unresolved_reloc = FALSE; 3113 } 3114 else if (r_type == ELF32_R_TYPE (rel->r_info)) 3115 { 3116 bfd_vma g_o_t = htab->sgotplt->output_section->vma 3117 + htab->sgotplt->output_offset; 3118 relocation = htab->sgot->output_section->vma 3119 + htab->sgot->output_offset + off - g_o_t; 3120 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) 3121 && tls_type == GOT_TLS_IE_BOTH) 3122 relocation += 4; 3123 if (r_type == R_386_TLS_IE) 3124 relocation += g_o_t; 3125 unresolved_reloc = FALSE; 3126 } 3127 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) 3128 { 3129 unsigned int val, type; 3130 bfd_vma roff; 3131 3132 /* GD->IE transition. */ 3133 BFD_ASSERT (rel->r_offset >= 2); 3134 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 3135 BFD_ASSERT (type == 0x8d || type == 0x04); 3136 BFD_ASSERT (rel->r_offset + 9 <= input_section->size); 3137 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) 3138 == 0xe8); 3139 BFD_ASSERT (rel + 1 < relend); 3140 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 3141 roff = rel->r_offset - 3; 3142 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 3143 if (type == 0x04) 3144 { 3145 /* leal foo(,%reg,1), %eax; call ___tls_get_addr 3146 Change it into: 3147 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ 3148 BFD_ASSERT (rel->r_offset >= 3); 3149 BFD_ASSERT (bfd_get_8 (input_bfd, 3150 contents + rel->r_offset - 3) 3151 == 0x8d); 3152 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); 3153 val >>= 3; 3154 } 3155 else 3156 { 3157 /* leal foo(%reg), %eax; call ___tls_get_addr; nop 3158 Change it into: 3159 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ 3160 BFD_ASSERT (rel->r_offset + 10 <= input_section->size); 3161 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); 3162 BFD_ASSERT (bfd_get_8 (input_bfd, 3163 contents + rel->r_offset + 9) 3164 == 0x90); 3165 roff = rel->r_offset - 2; 3166 } 3167 memcpy (contents + roff, 3168 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); 3169 contents[roff + 7] = 0x80 | (val & 7); 3170 /* If foo is used only with foo@gotntpoff(%reg) and 3171 foo@indntpoff, but not with foo@gottpoff(%reg), change 3172 subl $foo@gottpoff(%reg), %eax 3173 into: 3174 addl $foo@gotntpoff(%reg), %eax. */ 3175 if (r_type == R_386_TLS_GOTIE) 3176 { 3177 contents[roff + 6] = 0x03; 3178 if (tls_type == GOT_TLS_IE_BOTH) 3179 off += 4; 3180 } 3181 bfd_put_32 (output_bfd, 3182 htab->sgot->output_section->vma 3183 + htab->sgot->output_offset + off 3184 - htab->sgotplt->output_section->vma 3185 - htab->sgotplt->output_offset, 3186 contents + roff + 8); 3187 /* Skip R_386_PLT32. */ 3188 rel++; 3189 continue; 3190 } 3191 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) 3192 { 3193 /* GDesc -> IE transition. 3194 It's originally something like: 3195 leal x@tlsdesc(%ebx), %eax 3196 3197 Change it to: 3198 movl x@gotntpoff(%ebx), %eax # before nop; nop 3199 or: 3200 movl x@gottpoff(%ebx), %eax # before negl %eax 3201 3202 Registers other than %eax may be set up here. */ 3203 3204 unsigned int val, type; 3205 bfd_vma roff; 3206 3207 /* First, make sure it's a leal adding ebx to a 32-bit 3208 offset into any register, although it's probably 3209 almost always going to be eax. */ 3210 roff = rel->r_offset; 3211 BFD_ASSERT (roff >= 2); 3212 type = bfd_get_8 (input_bfd, contents + roff - 2); 3213 BFD_ASSERT (type == 0x8d); 3214 val = bfd_get_8 (input_bfd, contents + roff - 1); 3215 BFD_ASSERT ((val & 0xc7) == 0x83); 3216 BFD_ASSERT (roff + 4 <= input_section->size); 3217 3218 /* Now modify the instruction as appropriate. */ 3219 /* To turn a leal into a movl in the form we use it, it 3220 suffices to change the first byte from 0x8d to 0x8b. 3221 aoliva FIXME: should we decide to keep the leal, all 3222 we have to do is remove the statement below, and 3223 adjust the relaxation of R_386_TLS_DESC_CALL. */ 3224 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); 3225 3226 if (tls_type == GOT_TLS_IE_BOTH) 3227 off += 4; 3228 3229 bfd_put_32 (output_bfd, 3230 htab->sgot->output_section->vma 3231 + htab->sgot->output_offset + off 3232 - htab->sgotplt->output_section->vma 3233 - htab->sgotplt->output_offset, 3234 contents + roff); 3235 continue; 3236 } 3237 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) 3238 { 3239 /* GDesc -> IE transition. 3240 It's originally: 3241 call *(%eax) 3242 3243 Change it to: 3244 nop; nop 3245 or 3246 negl %eax 3247 depending on how we transformed the TLS_GOTDESC above. 3248 */ 3249 3250 unsigned int val, type; 3251 bfd_vma roff; 3252 3253 /* First, make sure it's a call *(%eax). */ 3254 roff = rel->r_offset; 3255 BFD_ASSERT (roff + 2 <= input_section->size); 3256 type = bfd_get_8 (input_bfd, contents + roff); 3257 BFD_ASSERT (type == 0xff); 3258 val = bfd_get_8 (input_bfd, contents + roff + 1); 3259 BFD_ASSERT (val == 0x10); 3260 3261 /* Now modify the instruction as appropriate. */ 3262 if (tls_type != GOT_TLS_IE_NEG) 3263 { 3264 /* nop; nop */ 3265 bfd_put_8 (output_bfd, 0x90, contents + roff); 3266 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 3267 } 3268 else 3269 { 3270 /* negl %eax */ 3271 bfd_put_8 (output_bfd, 0xf7, contents + roff); 3272 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1); 3273 } 3274 3275 continue; 3276 } 3277 else 3278 BFD_ASSERT (FALSE); 3279 break; 3280 3281 case R_386_TLS_LDM: 3282 if (! info->shared || info->executable) 3283 { 3284 unsigned int val; 3285 3286 /* LD->LE transition: 3287 Ensure it is: 3288 leal foo(%reg), %eax; call ___tls_get_addr. 3289 We change it into: 3290 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */ 3291 BFD_ASSERT (rel->r_offset >= 2); 3292 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2) 3293 == 0x8d); 3294 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 3295 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); 3296 BFD_ASSERT (rel->r_offset + 9 <= input_section->size); 3297 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) 3298 == 0xe8); 3299 BFD_ASSERT (rel + 1 < relend); 3300 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 3301 memcpy (contents + rel->r_offset - 2, 3302 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); 3303 /* Skip R_386_PLT32. */ 3304 rel++; 3305 continue; 3306 } 3307 3308 if (htab->sgot == NULL) 3309 abort (); 3310 3311 off = htab->tls_ldm_got.offset; 3312 if (off & 1) 3313 off &= ~1; 3314 else 3315 { 3316 Elf_Internal_Rela outrel; 3317 bfd_byte *loc; 3318 3319 if (htab->srelgot == NULL) 3320 abort (); 3321 3322 outrel.r_offset = (htab->sgot->output_section->vma 3323 + htab->sgot->output_offset + off); 3324 3325 bfd_put_32 (output_bfd, 0, 3326 htab->sgot->contents + off); 3327 bfd_put_32 (output_bfd, 0, 3328 htab->sgot->contents + off + 4); 3329 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); 3330 loc = htab->srelgot->contents; 3331 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); 3332 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3333 htab->tls_ldm_got.offset |= 1; 3334 } 3335 relocation = htab->sgot->output_section->vma 3336 + htab->sgot->output_offset + off 3337 - htab->sgotplt->output_section->vma 3338 - htab->sgotplt->output_offset; 3339 unresolved_reloc = FALSE; 3340 break; 3341 3342 case R_386_TLS_LDO_32: 3343 if ((info->shared && !info->executable) 3344 || (input_section->flags & SEC_CODE) == 0) 3345 relocation -= dtpoff_base (info); 3346 else 3347 /* When converting LDO to LE, we must negate. */ 3348 relocation = -tpoff (info, relocation); 3349 break; 3350 3351 case R_386_TLS_LE_32: 3352 case R_386_TLS_LE: 3353 if (info->shared && !info->executable) 3354 { 3355 Elf_Internal_Rela outrel; 3356 asection *sreloc; 3357 bfd_byte *loc; 3358 int indx; 3359 3360 outrel.r_offset = rel->r_offset 3361 + input_section->output_section->vma 3362 + input_section->output_offset; 3363 if (h != NULL && h->dynindx != -1) 3364 indx = h->dynindx; 3365 else 3366 indx = 0; 3367 if (r_type == R_386_TLS_LE_32) 3368 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); 3369 else 3370 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 3371 sreloc = elf_section_data (input_section)->sreloc; 3372 if (sreloc == NULL) 3373 abort (); 3374 loc = sreloc->contents; 3375 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 3376 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3377 if (indx) 3378 continue; 3379 else if (r_type == R_386_TLS_LE_32) 3380 relocation = dtpoff_base (info) - relocation; 3381 else 3382 relocation -= dtpoff_base (info); 3383 } 3384 else if (r_type == R_386_TLS_LE_32) 3385 relocation = tpoff (info, relocation); 3386 else 3387 relocation = -tpoff (info, relocation); 3388 break; 3389 3390 default: 3391 break; 3392 } 3393 3394 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3395 because such sections are not SEC_ALLOC and thus ld.so will 3396 not process them. */ 3397 if (unresolved_reloc 3398 && !((input_section->flags & SEC_DEBUGGING) != 0 3399 && h->def_dynamic)) 3400 { 3401 (*_bfd_error_handler) 3402 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 3403 input_bfd, 3404 input_section, 3405 (long) rel->r_offset, 3406 howto->name, 3407 h->root.root.string); 3408 return FALSE; 3409 } 3410 3411 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3412 contents, rel->r_offset, 3413 relocation, 0); 3414 3415 if (r != bfd_reloc_ok) 3416 { 3417 const char *name; 3418 3419 if (h != NULL) 3420 name = h->root.root.string; 3421 else 3422 { 3423 name = bfd_elf_string_from_elf_section (input_bfd, 3424 symtab_hdr->sh_link, 3425 sym->st_name); 3426 if (name == NULL) 3427 return FALSE; 3428 if (*name == '\0') 3429 name = bfd_section_name (input_bfd, sec); 3430 } 3431 3432 if (r == bfd_reloc_overflow) 3433 { 3434 if (! ((*info->callbacks->reloc_overflow) 3435 (info, (h ? &h->root : NULL), name, howto->name, 3436 (bfd_vma) 0, input_bfd, input_section, 3437 rel->r_offset))) 3438 return FALSE; 3439 } 3440 else 3441 { 3442 (*_bfd_error_handler) 3443 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 3444 input_bfd, input_section, 3445 (long) rel->r_offset, name, (int) r); 3446 return FALSE; 3447 } 3448 } 3449 } 3450 3451 return TRUE; 3452 } 3453 3454 /* Finish up dynamic symbol handling. We set the contents of various 3455 dynamic sections here. */ 3456 3457 static bfd_boolean 3458 elf_i386_finish_dynamic_symbol (bfd *output_bfd, 3459 struct bfd_link_info *info, 3460 struct elf_link_hash_entry *h, 3461 Elf_Internal_Sym *sym) 3462 { 3463 struct elf_i386_link_hash_table *htab; 3464 3465 htab = elf_i386_hash_table (info); 3466 3467 if (h->plt.offset != (bfd_vma) -1) 3468 { 3469 bfd_vma plt_index; 3470 bfd_vma got_offset; 3471 Elf_Internal_Rela rel; 3472 bfd_byte *loc; 3473 3474 /* This symbol has an entry in the procedure linkage table. Set 3475 it up. */ 3476 3477 if (h->dynindx == -1 3478 || htab->splt == NULL 3479 || htab->sgotplt == NULL 3480 || htab->srelplt == NULL) 3481 abort (); 3482 3483 /* Get the index in the procedure linkage table which 3484 corresponds to this symbol. This is the index of this symbol 3485 in all the symbols for which we are making plt entries. The 3486 first entry in the procedure linkage table is reserved. */ 3487 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 3488 3489 /* Get the offset into the .got table of the entry that 3490 corresponds to this function. Each .got entry is 4 bytes. 3491 The first three are reserved. */ 3492 got_offset = (plt_index + 3) * 4; 3493 3494 /* Fill in the entry in the procedure linkage table. */ 3495 if (! info->shared) 3496 { 3497 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry, 3498 PLT_ENTRY_SIZE); 3499 bfd_put_32 (output_bfd, 3500 (htab->sgotplt->output_section->vma 3501 + htab->sgotplt->output_offset 3502 + got_offset), 3503 htab->splt->contents + h->plt.offset + 2); 3504 3505 if (htab->is_vxworks) 3506 { 3507 int s, k, reloc_index; 3508 3509 /* Create the R_386_32 relocation referencing the GOT 3510 for this PLT entry. */ 3511 3512 /* S: Current slot number (zero-based). */ 3513 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3514 /* K: Number of relocations for PLTResolve. */ 3515 if (info->shared) 3516 k = PLTRESOLVE_RELOCS_SHLIB; 3517 else 3518 k = PLTRESOLVE_RELOCS; 3519 /* Skip the PLTresolve relocations, and the relocations for 3520 the other PLT slots. */ 3521 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS; 3522 loc = (htab->srelplt2->contents + reloc_index 3523 * sizeof (Elf32_External_Rel)); 3524 3525 rel.r_offset = (htab->splt->output_section->vma 3526 + htab->splt->output_offset 3527 + h->plt.offset + 2), 3528 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 3529 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3530 3531 /* Create the R_386_32 relocation referencing the beginning of 3532 the PLT for this GOT entry. */ 3533 rel.r_offset = (htab->sgotplt->output_section->vma 3534 + htab->sgotplt->output_offset 3535 + got_offset); 3536 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); 3537 bfd_elf32_swap_reloc_out (output_bfd, &rel, 3538 loc + sizeof (Elf32_External_Rel)); 3539 } 3540 } 3541 else 3542 { 3543 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry, 3544 PLT_ENTRY_SIZE); 3545 bfd_put_32 (output_bfd, got_offset, 3546 htab->splt->contents + h->plt.offset + 2); 3547 } 3548 3549 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), 3550 htab->splt->contents + h->plt.offset + 7); 3551 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), 3552 htab->splt->contents + h->plt.offset + 12); 3553 3554 /* Fill in the entry in the global offset table. */ 3555 bfd_put_32 (output_bfd, 3556 (htab->splt->output_section->vma 3557 + htab->splt->output_offset 3558 + h->plt.offset 3559 + 6), 3560 htab->sgotplt->contents + got_offset); 3561 3562 /* Fill in the entry in the .rel.plt section. */ 3563 rel.r_offset = (htab->sgotplt->output_section->vma 3564 + htab->sgotplt->output_offset 3565 + got_offset); 3566 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); 3567 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel); 3568 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3569 3570 if (!h->def_regular) 3571 { 3572 /* Mark the symbol as undefined, rather than as defined in 3573 the .plt section. Leave the value if there were any 3574 relocations where pointer equality matters (this is a clue 3575 for the dynamic linker, to make function pointer 3576 comparisons work between an application and shared 3577 library), otherwise set it to zero. If a function is only 3578 called from a binary, there is no need to slow down 3579 shared libraries because of that. */ 3580 sym->st_shndx = SHN_UNDEF; 3581 if (!h->pointer_equality_needed) 3582 sym->st_value = 0; 3583 } 3584 } 3585 3586 if (h->got.offset != (bfd_vma) -1 3587 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type) 3588 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0) 3589 { 3590 Elf_Internal_Rela rel; 3591 bfd_byte *loc; 3592 3593 /* This symbol has an entry in the global offset table. Set it 3594 up. */ 3595 3596 if (htab->sgot == NULL || htab->srelgot == NULL) 3597 abort (); 3598 3599 rel.r_offset = (htab->sgot->output_section->vma 3600 + htab->sgot->output_offset 3601 + (h->got.offset & ~(bfd_vma) 1)); 3602 3603 /* If this is a static link, or it is a -Bsymbolic link and the 3604 symbol is defined locally or was forced to be local because 3605 of a version file, we just want to emit a RELATIVE reloc. 3606 The entry in the global offset table will already have been 3607 initialized in the relocate_section function. */ 3608 if (info->shared 3609 && SYMBOL_REFERENCES_LOCAL (info, h)) 3610 { 3611 BFD_ASSERT((h->got.offset & 1) != 0); 3612 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 3613 } 3614 else 3615 { 3616 BFD_ASSERT((h->got.offset & 1) == 0); 3617 bfd_put_32 (output_bfd, (bfd_vma) 0, 3618 htab->sgot->contents + h->got.offset); 3619 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); 3620 } 3621 3622 loc = htab->srelgot->contents; 3623 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); 3624 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3625 } 3626 3627 if (h->needs_copy) 3628 { 3629 Elf_Internal_Rela rel; 3630 bfd_byte *loc; 3631 3632 /* This symbol needs a copy reloc. Set it up. */ 3633 3634 if (h->dynindx == -1 3635 || (h->root.type != bfd_link_hash_defined 3636 && h->root.type != bfd_link_hash_defweak) 3637 || htab->srelbss == NULL) 3638 abort (); 3639 3640 rel.r_offset = (h->root.u.def.value 3641 + h->root.u.def.section->output_section->vma 3642 + h->root.u.def.section->output_offset); 3643 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); 3644 loc = htab->srelbss->contents; 3645 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel); 3646 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3647 } 3648 3649 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. 3650 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it 3651 is relative to the ".got" section. */ 3652 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 3653 || (!htab->is_vxworks && h == htab->elf.hgot)) 3654 sym->st_shndx = SHN_ABS; 3655 3656 return TRUE; 3657 } 3658 3659 /* Used to decide how to sort relocs in an optimal manner for the 3660 dynamic linker, before writing them out. */ 3661 3662 static enum elf_reloc_type_class 3663 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela) 3664 { 3665 switch (ELF32_R_TYPE (rela->r_info)) 3666 { 3667 case R_386_RELATIVE: 3668 return reloc_class_relative; 3669 case R_386_JUMP_SLOT: 3670 return reloc_class_plt; 3671 case R_386_COPY: 3672 return reloc_class_copy; 3673 default: 3674 return reloc_class_normal; 3675 } 3676 } 3677 3678 /* Finish up the dynamic sections. */ 3679 3680 static bfd_boolean 3681 elf_i386_finish_dynamic_sections (bfd *output_bfd, 3682 struct bfd_link_info *info) 3683 { 3684 struct elf_i386_link_hash_table *htab; 3685 bfd *dynobj; 3686 asection *sdyn; 3687 3688 htab = elf_i386_hash_table (info); 3689 dynobj = htab->elf.dynobj; 3690 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 3691 3692 if (htab->elf.dynamic_sections_created) 3693 { 3694 Elf32_External_Dyn *dyncon, *dynconend; 3695 3696 if (sdyn == NULL || htab->sgot == NULL) 3697 abort (); 3698 3699 dyncon = (Elf32_External_Dyn *) sdyn->contents; 3700 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 3701 for (; dyncon < dynconend; dyncon++) 3702 { 3703 Elf_Internal_Dyn dyn; 3704 asection *s; 3705 3706 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 3707 3708 switch (dyn.d_tag) 3709 { 3710 default: 3711 continue; 3712 3713 case DT_PLTGOT: 3714 s = htab->sgotplt; 3715 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3716 break; 3717 3718 case DT_JMPREL: 3719 s = htab->srelplt; 3720 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3721 break; 3722 3723 case DT_PLTRELSZ: 3724 s = htab->srelplt; 3725 dyn.d_un.d_val = s->size; 3726 break; 3727 3728 case DT_RELSZ: 3729 /* My reading of the SVR4 ABI indicates that the 3730 procedure linkage table relocs (DT_JMPREL) should be 3731 included in the overall relocs (DT_REL). This is 3732 what Solaris does. However, UnixWare can not handle 3733 that case. Therefore, we override the DT_RELSZ entry 3734 here to make it not include the JMPREL relocs. */ 3735 s = htab->srelplt; 3736 if (s == NULL) 3737 continue; 3738 dyn.d_un.d_val -= s->size; 3739 break; 3740 3741 case DT_REL: 3742 /* We may not be using the standard ELF linker script. 3743 If .rel.plt is the first .rel section, we adjust 3744 DT_REL to not include it. */ 3745 s = htab->srelplt; 3746 if (s == NULL) 3747 continue; 3748 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) 3749 continue; 3750 dyn.d_un.d_ptr += s->size; 3751 break; 3752 } 3753 3754 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3755 } 3756 3757 /* Fill in the first entry in the procedure linkage table. */ 3758 if (htab->splt && htab->splt->size > 0) 3759 { 3760 if (info->shared) 3761 { 3762 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry, 3763 sizeof (elf_i386_pic_plt0_entry)); 3764 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry), 3765 htab->plt0_pad_byte, 3766 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry)); 3767 } 3768 else 3769 { 3770 memcpy (htab->splt->contents, elf_i386_plt0_entry, 3771 sizeof(elf_i386_plt0_entry)); 3772 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry), 3773 htab->plt0_pad_byte, 3774 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry)); 3775 bfd_put_32 (output_bfd, 3776 (htab->sgotplt->output_section->vma 3777 + htab->sgotplt->output_offset 3778 + 4), 3779 htab->splt->contents + 2); 3780 bfd_put_32 (output_bfd, 3781 (htab->sgotplt->output_section->vma 3782 + htab->sgotplt->output_offset 3783 + 8), 3784 htab->splt->contents + 8); 3785 3786 if (htab->is_vxworks) 3787 { 3788 Elf_Internal_Rela rel; 3789 3790 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4. 3791 On IA32 we use REL relocations so the addend goes in 3792 the PLT directly. */ 3793 rel.r_offset = (htab->splt->output_section->vma 3794 + htab->splt->output_offset 3795 + 2); 3796 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 3797 bfd_elf32_swap_reloc_out (output_bfd, &rel, 3798 htab->srelplt2->contents); 3799 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ 3800 rel.r_offset = (htab->splt->output_section->vma 3801 + htab->splt->output_offset 3802 + 8); 3803 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 3804 bfd_elf32_swap_reloc_out (output_bfd, &rel, 3805 htab->srelplt2->contents + 3806 sizeof (Elf32_External_Rel)); 3807 } 3808 } 3809 3810 /* UnixWare sets the entsize of .plt to 4, although that doesn't 3811 really seem like the right value. */ 3812 elf_section_data (htab->splt->output_section) 3813 ->this_hdr.sh_entsize = 4; 3814 3815 /* Correct the .rel.plt.unloaded relocations. */ 3816 if (htab->is_vxworks && !info->shared) 3817 { 3818 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1; 3819 unsigned char *p; 3820 3821 p = htab->srelplt2->contents; 3822 if (info->shared) 3823 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel); 3824 else 3825 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel); 3826 3827 for (; num_plts; num_plts--) 3828 { 3829 Elf_Internal_Rela rel; 3830 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 3831 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 3832 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 3833 p += sizeof (Elf32_External_Rel); 3834 3835 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 3836 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); 3837 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 3838 p += sizeof (Elf32_External_Rel); 3839 } 3840 } 3841 } 3842 } 3843 3844 if (htab->sgotplt) 3845 { 3846 /* Fill in the first three entries in the global offset table. */ 3847 if (htab->sgotplt->size > 0) 3848 { 3849 bfd_put_32 (output_bfd, 3850 (sdyn == NULL ? 0 3851 : sdyn->output_section->vma + sdyn->output_offset), 3852 htab->sgotplt->contents); 3853 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4); 3854 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8); 3855 } 3856 3857 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4; 3858 } 3859 3860 if (htab->sgot && htab->sgot->size > 0) 3861 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4; 3862 3863 return TRUE; 3864 } 3865 3866 /* Return address for Ith PLT stub in section PLT, for relocation REL 3867 or (bfd_vma) -1 if it should not be included. */ 3868 3869 static bfd_vma 3870 elf_i386_plt_sym_val (bfd_vma i, const asection *plt, 3871 const arelent *rel ATTRIBUTE_UNUSED) 3872 { 3873 return plt->vma + (i + 1) * PLT_ENTRY_SIZE; 3874 } 3875 3876 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 3877 3878 static bfd_boolean 3879 elf_i386_hash_symbol (struct elf_link_hash_entry *h) 3880 { 3881 if (h->plt.offset != (bfd_vma) -1 3882 && !h->def_regular 3883 && !h->pointer_equality_needed) 3884 return FALSE; 3885 3886 return _bfd_elf_hash_symbol (h); 3887 } 3888 3889 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec 3890 #define TARGET_LITTLE_NAME "elf32-i386" 3891 #define ELF_ARCH bfd_arch_i386 3892 #define ELF_MACHINE_CODE EM_386 3893 #define ELF_MAXPAGESIZE 0x1000 3894 3895 #define elf_backend_can_gc_sections 1 3896 #define elf_backend_can_refcount 1 3897 #define elf_backend_want_got_plt 1 3898 #define elf_backend_plt_readonly 1 3899 #define elf_backend_want_plt_sym 0 3900 #define elf_backend_got_header_size 12 3901 3902 /* Support RELA for objdump of prelink objects. */ 3903 #define elf_info_to_howto elf_i386_info_to_howto_rel 3904 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel 3905 3906 #define bfd_elf32_mkobject elf_i386_mkobject 3907 3908 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name 3909 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create 3910 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup 3911 3912 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol 3913 #define elf_backend_check_relocs elf_i386_check_relocs 3914 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol 3915 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections 3916 #define elf_backend_fake_sections elf_i386_fake_sections 3917 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections 3918 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol 3919 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook 3920 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook 3921 #define elf_backend_grok_prstatus elf_i386_grok_prstatus 3922 #define elf_backend_grok_psinfo elf_i386_grok_psinfo 3923 #define elf_backend_reloc_type_class elf_i386_reloc_type_class 3924 #define elf_backend_relocate_section elf_i386_relocate_section 3925 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections 3926 #define elf_backend_always_size_sections elf_i386_always_size_sections 3927 #define elf_backend_plt_sym_val elf_i386_plt_sym_val 3928 #define elf_backend_hash_symbol elf_i386_hash_symbol 3929 3930 #include "elf32-target.h" 3931 3932 /* FreeBSD support. */ 3933 3934 #undef TARGET_LITTLE_SYM 3935 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec 3936 #undef TARGET_LITTLE_NAME 3937 #define TARGET_LITTLE_NAME "elf32-i386-freebsd" 3938 3939 /* The kernel recognizes executables as valid only if they carry a 3940 "FreeBSD" label in the ELF header. So we put this label on all 3941 executables and (for simplicity) also all other object files. */ 3942 3943 static void 3944 elf_i386_post_process_headers (bfd *abfd, 3945 struct bfd_link_info *info ATTRIBUTE_UNUSED) 3946 { 3947 Elf_Internal_Ehdr *i_ehdrp; 3948 3949 i_ehdrp = elf_elfheader (abfd); 3950 3951 /* Put an ABI label supported by FreeBSD >= 4.1. */ 3952 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 3953 #ifdef OLD_FREEBSD_ABI_LABEL 3954 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ 3955 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); 3956 #endif 3957 } 3958 3959 #undef elf_backend_post_process_headers 3960 #define elf_backend_post_process_headers elf_i386_post_process_headers 3961 #undef elf32_bed 3962 #define elf32_bed elf32_i386_fbsd_bed 3963 3964 #include "elf32-target.h" 3965 3966 /* VxWorks support. */ 3967 3968 #undef TARGET_LITTLE_SYM 3969 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec 3970 #undef TARGET_LITTLE_NAME 3971 #define TARGET_LITTLE_NAME "elf32-i386-vxworks" 3972 3973 3974 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */ 3975 3976 static struct bfd_link_hash_table * 3977 elf_i386_vxworks_link_hash_table_create (bfd *abfd) 3978 { 3979 struct bfd_link_hash_table *ret; 3980 struct elf_i386_link_hash_table *htab; 3981 3982 ret = elf_i386_link_hash_table_create (abfd); 3983 if (ret) 3984 { 3985 htab = (struct elf_i386_link_hash_table *) ret; 3986 htab->is_vxworks = 1; 3987 htab->plt0_pad_byte = 0x90; 3988 } 3989 3990 return ret; 3991 } 3992 3993 3994 #undef elf_backend_post_process_headers 3995 #undef bfd_elf32_bfd_link_hash_table_create 3996 #define bfd_elf32_bfd_link_hash_table_create \ 3997 elf_i386_vxworks_link_hash_table_create 3998 #undef elf_backend_add_symbol_hook 3999 #define elf_backend_add_symbol_hook \ 4000 elf_vxworks_add_symbol_hook 4001 #undef elf_backend_link_output_symbol_hook 4002 #define elf_backend_link_output_symbol_hook \ 4003 elf_vxworks_link_output_symbol_hook 4004 #undef elf_backend_emit_relocs 4005 #define elf_backend_emit_relocs elf_vxworks_emit_relocs 4006 #undef elf_backend_final_write_processing 4007 #define elf_backend_final_write_processing \ 4008 elf_vxworks_final_write_processing 4009 4010 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so 4011 define it. */ 4012 #undef elf_backend_want_plt_sym 4013 #define elf_backend_want_plt_sym 1 4014 4015 #undef elf32_bed 4016 #define elf32_bed elf32_i386_vxworks_bed 4017 4018 #include "elf32-target.h" 4019