1/* Intel 80386/80486-specific support for 32-bit ELF 2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 3 2003, 2004, 2005, 2006, 2007 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 "sysdep.h" 22#include "bfd.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 33static 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 185static reloc_howto_type * 186elf_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 333static reloc_howto_type * 334elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 335 const char *r_name) 336{ 337 unsigned int i; 338 339 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) 340 if (elf_howto_table[i].name != NULL 341 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 342 return &elf_howto_table[i]; 343 344 return NULL; 345} 346 347static void 348elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, 349 arelent *cache_ptr, 350 Elf_Internal_Rela *dst) 351{ 352 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 353 unsigned int indx; 354 355 if ((indx = r_type) >= R_386_standard 356 && ((indx = r_type - R_386_ext_offset) - R_386_standard 357 >= R_386_ext - R_386_standard) 358 && ((indx = r_type - R_386_tls_offset) - R_386_ext 359 >= R_386_tls - R_386_ext) 360 && ((indx = r_type - R_386_vt_offset) - R_386_tls 361 >= R_386_vt - R_386_tls)) 362 { 363 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 364 abfd, (int) r_type); 365 indx = R_386_NONE; 366 } 367 cache_ptr->howto = &elf_howto_table[indx]; 368} 369 370/* Return whether a symbol name implies a local label. The UnixWare 371 2.1 cc generates temporary symbols that start with .X, so we 372 recognize them here. FIXME: do other SVR4 compilers also use .X?. 373 If so, we should move the .X recognition into 374 _bfd_elf_is_local_label_name. */ 375 376static bfd_boolean 377elf_i386_is_local_label_name (bfd *abfd, const char *name) 378{ 379 if (name[0] == '.' && name[1] == 'X') 380 return TRUE; 381 382 return _bfd_elf_is_local_label_name (abfd, name); 383} 384 385/* Support for core dump NOTE sections. */ 386 387static bfd_boolean 388elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 389{ 390 int offset; 391 size_t size; 392 393 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 394 { 395 int pr_version = bfd_get_32 (abfd, note->descdata); 396 397 if (pr_version != 1) 398 return FALSE; 399 400 /* pr_cursig */ 401 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20); 402 403 /* pr_pid */ 404 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); 405 406 /* pr_reg */ 407 offset = 28; 408 size = bfd_get_32 (abfd, note->descdata + 8); 409 } 410 else 411 { 412 switch (note->descsz) 413 { 414 default: 415 return FALSE; 416 417 case 144: /* Linux/i386 */ 418 /* pr_cursig */ 419 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 420 421 /* pr_pid */ 422 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); 423 424 /* pr_reg */ 425 offset = 72; 426 size = 68; 427 428 break; 429 } 430 } 431 432 /* Make a ".reg/999" section. */ 433 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 434 size, note->descpos + offset); 435} 436 437static bfd_boolean 438elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 439{ 440 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 441 { 442 int pr_version = bfd_get_32 (abfd, note->descdata); 443 444 if (pr_version != 1) 445 return FALSE; 446 447 elf_tdata (abfd)->core_program 448 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); 449 elf_tdata (abfd)->core_command 450 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); 451 } 452 else 453 { 454 switch (note->descsz) 455 { 456 default: 457 return FALSE; 458 459 case 124: /* Linux/i386 elf_prpsinfo. */ 460 elf_tdata (abfd)->core_program 461 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 462 elf_tdata (abfd)->core_command 463 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 464 } 465 } 466 467 /* Note that for some reason, a spurious space is tacked 468 onto the end of the args in some (at least one anyway) 469 implementations, so strip it off if it exists. */ 470 { 471 char *command = elf_tdata (abfd)->core_command; 472 int n = strlen (command); 473 474 if (0 < n && command[n - 1] == ' ') 475 command[n - 1] = '\0'; 476 } 477 478 return TRUE; 479} 480 481/* Functions for the i386 ELF linker. 482 483 In order to gain some understanding of code in this file without 484 knowing all the intricate details of the linker, note the 485 following: 486 487 Functions named elf_i386_* are called by external routines, other 488 functions are only called locally. elf_i386_* functions appear 489 in this file more or less in the order in which they are called 490 from external routines. eg. elf_i386_check_relocs is called 491 early in the link process, elf_i386_finish_dynamic_sections is 492 one of the last functions. */ 493 494 495/* The name of the dynamic interpreter. This is put in the .interp 496 section. */ 497 498#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 499 500/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 501 copying dynamic variables from a shared lib into an app's dynbss 502 section, and instead use a dynamic relocation to point into the 503 shared lib. */ 504#define ELIMINATE_COPY_RELOCS 1 505 506/* The size in bytes of an entry in the procedure linkage table. */ 507 508#define PLT_ENTRY_SIZE 16 509 510/* The first entry in an absolute procedure linkage table looks like 511 this. See the SVR4 ABI i386 supplement to see how this works. 512 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ 513 514static const bfd_byte elf_i386_plt0_entry[12] = 515{ 516 0xff, 0x35, /* pushl contents of address */ 517 0, 0, 0, 0, /* replaced with address of .got + 4. */ 518 0xff, 0x25, /* jmp indirect */ 519 0, 0, 0, 0 /* replaced with address of .got + 8. */ 520}; 521 522/* Subsequent entries in an absolute procedure linkage table look like 523 this. */ 524 525static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = 526{ 527 0xff, 0x25, /* jmp indirect */ 528 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ 529 0x68, /* pushl immediate */ 530 0, 0, 0, 0, /* replaced with offset into relocation table. */ 531 0xe9, /* jmp relative */ 532 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 533}; 534 535/* The first entry in a PIC procedure linkage table look like this. 536 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ 537 538static const bfd_byte elf_i386_pic_plt0_entry[12] = 539{ 540 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ 541 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */ 542}; 543 544/* Subsequent entries in a PIC procedure linkage table look like this. */ 545 546static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = 547{ 548 0xff, 0xa3, /* jmp *offset(%ebx) */ 549 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 550 0x68, /* pushl immediate */ 551 0, 0, 0, 0, /* replaced with offset into relocation table. */ 552 0xe9, /* jmp relative */ 553 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 554}; 555 556/* On VxWorks, the .rel.plt.unloaded section has absolute relocations 557 for the PLTResolve stub and then for each PLT entry. */ 558#define PLTRESOLVE_RELOCS_SHLIB 0 559#define PLTRESOLVE_RELOCS 2 560#define PLT_NON_JUMP_SLOT_RELOCS 2 561 562/* The i386 linker needs to keep track of the number of relocs that it 563 decides to copy as dynamic relocs in check_relocs for each symbol. 564 This is so that it can later discard them if they are found to be 565 unnecessary. We store the information in a field extending the 566 regular ELF linker hash table. */ 567 568struct elf_i386_dyn_relocs 569{ 570 struct elf_i386_dyn_relocs *next; 571 572 /* The input section of the reloc. */ 573 asection *sec; 574 575 /* Total number of relocs copied for the input section. */ 576 bfd_size_type count; 577 578 /* Number of pc-relative relocs copied for the input section. */ 579 bfd_size_type pc_count; 580}; 581 582/* i386 ELF linker hash entry. */ 583 584struct elf_i386_link_hash_entry 585{ 586 struct elf_link_hash_entry elf; 587 588 /* Track dynamic relocs copied for this symbol. */ 589 struct elf_i386_dyn_relocs *dyn_relocs; 590 591#define GOT_UNKNOWN 0 592#define GOT_NORMAL 1 593#define GOT_TLS_GD 2 594#define GOT_TLS_IE 4 595#define GOT_TLS_IE_POS 5 596#define GOT_TLS_IE_NEG 6 597#define GOT_TLS_IE_BOTH 7 598#define GOT_TLS_GDESC 8 599#define GOT_TLS_GD_BOTH_P(type) \ 600 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) 601#define GOT_TLS_GD_P(type) \ 602 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) 603#define GOT_TLS_GDESC_P(type) \ 604 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) 605#define GOT_TLS_GD_ANY_P(type) \ 606 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) 607 unsigned char tls_type; 608 609 /* Offset of the GOTPLT entry reserved for the TLS descriptor, 610 starting at the end of the jump table. */ 611 bfd_vma tlsdesc_got; 612}; 613 614#define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent)) 615 616struct elf_i386_obj_tdata 617{ 618 struct elf_obj_tdata root; 619 620 /* tls_type for each local got entry. */ 621 char *local_got_tls_type; 622 623 /* GOTPLT entries for TLS descriptors. */ 624 bfd_vma *local_tlsdesc_gotent; 625}; 626 627#define elf_i386_tdata(abfd) \ 628 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any) 629 630#define elf_i386_local_got_tls_type(abfd) \ 631 (elf_i386_tdata (abfd)->local_got_tls_type) 632 633#define elf_i386_local_tlsdesc_gotent(abfd) \ 634 (elf_i386_tdata (abfd)->local_tlsdesc_gotent) 635 636static bfd_boolean 637elf_i386_mkobject (bfd *abfd) 638{ 639 if (abfd->tdata.any == NULL) 640 { 641 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata); 642 abfd->tdata.any = bfd_zalloc (abfd, amt); 643 if (abfd->tdata.any == NULL) 644 return FALSE; 645 } 646 return bfd_elf_mkobject (abfd); 647} 648 649/* i386 ELF linker hash table. */ 650 651struct elf_i386_link_hash_table 652{ 653 struct elf_link_hash_table elf; 654 655 /* Short-cuts to get to dynamic linker sections. */ 656 asection *sgot; 657 asection *sgotplt; 658 asection *srelgot; 659 asection *splt; 660 asection *srelplt; 661 asection *sdynbss; 662 asection *srelbss; 663 664 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */ 665 asection *srelplt2; 666 667 /* True if the target system is VxWorks. */ 668 int is_vxworks; 669 670 /* Value used to fill the last word of the first plt entry. */ 671 bfd_byte plt0_pad_byte; 672 673 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */ 674 bfd_vma next_tls_desc_index; 675 676 union { 677 bfd_signed_vma refcount; 678 bfd_vma offset; 679 } tls_ldm_got; 680 681 /* The amount of space used by the reserved portion of the sgotplt 682 section, plus whatever space is used by the jump slots. */ 683 bfd_vma sgotplt_jump_table_size; 684 685 /* Small local sym to section mapping cache. */ 686 struct sym_sec_cache sym_sec; 687}; 688 689/* Get the i386 ELF linker hash table from a link_info structure. */ 690 691#define elf_i386_hash_table(p) \ 692 ((struct elf_i386_link_hash_table *) ((p)->hash)) 693 694#define elf_i386_compute_jump_table_size(htab) \ 695 ((htab)->next_tls_desc_index * 4) 696 697/* Create an entry in an i386 ELF linker hash table. */ 698 699static struct bfd_hash_entry * 700link_hash_newfunc (struct bfd_hash_entry *entry, 701 struct bfd_hash_table *table, 702 const char *string) 703{ 704 /* Allocate the structure if it has not already been allocated by a 705 subclass. */ 706 if (entry == NULL) 707 { 708 entry = bfd_hash_allocate (table, 709 sizeof (struct elf_i386_link_hash_entry)); 710 if (entry == NULL) 711 return entry; 712 } 713 714 /* Call the allocation method of the superclass. */ 715 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 716 if (entry != NULL) 717 { 718 struct elf_i386_link_hash_entry *eh; 719 720 eh = (struct elf_i386_link_hash_entry *) entry; 721 eh->dyn_relocs = NULL; 722 eh->tls_type = GOT_UNKNOWN; 723 eh->tlsdesc_got = (bfd_vma) -1; 724 } 725 726 return entry; 727} 728 729/* Create an i386 ELF linker hash table. */ 730 731static struct bfd_link_hash_table * 732elf_i386_link_hash_table_create (bfd *abfd) 733{ 734 struct elf_i386_link_hash_table *ret; 735 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); 736 737 ret = bfd_malloc (amt); 738 if (ret == NULL) 739 return NULL; 740 741 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, 742 sizeof (struct elf_i386_link_hash_entry))) 743 { 744 free (ret); 745 return NULL; 746 } 747 748 ret->sgot = NULL; 749 ret->sgotplt = NULL; 750 ret->srelgot = NULL; 751 ret->splt = NULL; 752 ret->srelplt = NULL; 753 ret->sdynbss = NULL; 754 ret->srelbss = NULL; 755 ret->tls_ldm_got.refcount = 0; 756 ret->next_tls_desc_index = 0; 757 ret->sgotplt_jump_table_size = 0; 758 ret->sym_sec.abfd = NULL; 759 ret->is_vxworks = 0; 760 ret->srelplt2 = NULL; 761 ret->plt0_pad_byte = 0; 762 763 return &ret->elf.root; 764} 765 766/* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up 767 shortcuts to them in our hash table. */ 768 769static bfd_boolean 770create_got_section (bfd *dynobj, struct bfd_link_info *info) 771{ 772 struct elf_i386_link_hash_table *htab; 773 774 if (! _bfd_elf_create_got_section (dynobj, info)) 775 return FALSE; 776 777 htab = elf_i386_hash_table (info); 778 htab->sgot = bfd_get_section_by_name (dynobj, ".got"); 779 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 780 if (!htab->sgot || !htab->sgotplt) 781 abort (); 782 783 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got", 784 (SEC_ALLOC | SEC_LOAD 785 | SEC_HAS_CONTENTS 786 | SEC_IN_MEMORY 787 | SEC_LINKER_CREATED 788 | SEC_READONLY)); 789 if (htab->srelgot == NULL 790 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) 791 return FALSE; 792 return TRUE; 793} 794 795/* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and 796 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our 797 hash table. */ 798 799static bfd_boolean 800elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 801{ 802 struct elf_i386_link_hash_table *htab; 803 804 htab = elf_i386_hash_table (info); 805 if (!htab->sgot && !create_got_section (dynobj, info)) 806 return FALSE; 807 808 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 809 return FALSE; 810 811 htab->splt = bfd_get_section_by_name (dynobj, ".plt"); 812 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); 813 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 814 if (!info->shared) 815 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); 816 817 if (!htab->splt || !htab->srelplt || !htab->sdynbss 818 || (!info->shared && !htab->srelbss)) 819 abort (); 820 821 if (htab->is_vxworks 822 && !elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2)) 823 return FALSE; 824 825 return TRUE; 826} 827 828/* Copy the extra info we tack onto an elf_link_hash_entry. */ 829 830static void 831elf_i386_copy_indirect_symbol (struct bfd_link_info *info, 832 struct elf_link_hash_entry *dir, 833 struct elf_link_hash_entry *ind) 834{ 835 struct elf_i386_link_hash_entry *edir, *eind; 836 837 edir = (struct elf_i386_link_hash_entry *) dir; 838 eind = (struct elf_i386_link_hash_entry *) ind; 839 840 if (eind->dyn_relocs != NULL) 841 { 842 if (edir->dyn_relocs != NULL) 843 { 844 struct elf_i386_dyn_relocs **pp; 845 struct elf_i386_dyn_relocs *p; 846 847 /* Add reloc counts against the indirect sym to the direct sym 848 list. Merge any entries against the same section. */ 849 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 850 { 851 struct elf_i386_dyn_relocs *q; 852 853 for (q = edir->dyn_relocs; q != NULL; q = q->next) 854 if (q->sec == p->sec) 855 { 856 q->pc_count += p->pc_count; 857 q->count += p->count; 858 *pp = p->next; 859 break; 860 } 861 if (q == NULL) 862 pp = &p->next; 863 } 864 *pp = edir->dyn_relocs; 865 } 866 867 edir->dyn_relocs = eind->dyn_relocs; 868 eind->dyn_relocs = NULL; 869 } 870 871 if (ind->root.type == bfd_link_hash_indirect 872 && dir->got.refcount <= 0) 873 { 874 edir->tls_type = eind->tls_type; 875 eind->tls_type = GOT_UNKNOWN; 876 } 877 878 if (ELIMINATE_COPY_RELOCS 879 && ind->root.type != bfd_link_hash_indirect 880 && dir->dynamic_adjusted) 881 { 882 /* If called to transfer flags for a weakdef during processing 883 of elf_adjust_dynamic_symbol, don't copy non_got_ref. 884 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 885 dir->ref_dynamic |= ind->ref_dynamic; 886 dir->ref_regular |= ind->ref_regular; 887 dir->ref_regular_nonweak |= ind->ref_regular_nonweak; 888 dir->needs_plt |= ind->needs_plt; 889 dir->pointer_equality_needed |= ind->pointer_equality_needed; 890 } 891 else 892 _bfd_elf_link_hash_copy_indirect (info, dir, ind); 893} 894 895static int 896elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local) 897{ 898 if (info->shared) 899 return r_type; 900 901 switch (r_type) 902 { 903 case R_386_TLS_GD: 904 case R_386_TLS_GOTDESC: 905 case R_386_TLS_DESC_CALL: 906 case R_386_TLS_IE_32: 907 if (is_local) 908 return R_386_TLS_LE_32; 909 return R_386_TLS_IE_32; 910 case R_386_TLS_IE: 911 case R_386_TLS_GOTIE: 912 if (is_local) 913 return R_386_TLS_LE_32; 914 return r_type; 915 case R_386_TLS_LDM: 916 return R_386_TLS_LE_32; 917 } 918 919 return r_type; 920} 921 922/* Look through the relocs for a section during the first phase, and 923 calculate needed space in the global offset table, procedure linkage 924 table, and dynamic reloc sections. */ 925 926static bfd_boolean 927elf_i386_check_relocs (bfd *abfd, 928 struct bfd_link_info *info, 929 asection *sec, 930 const Elf_Internal_Rela *relocs) 931{ 932 struct elf_i386_link_hash_table *htab; 933 Elf_Internal_Shdr *symtab_hdr; 934 struct elf_link_hash_entry **sym_hashes; 935 const Elf_Internal_Rela *rel; 936 const Elf_Internal_Rela *rel_end; 937 asection *sreloc; 938 939 if (info->relocatable) 940 return TRUE; 941 942 htab = elf_i386_hash_table (info); 943 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 944 sym_hashes = elf_sym_hashes (abfd); 945 946 sreloc = NULL; 947 948 rel_end = relocs + sec->reloc_count; 949 for (rel = relocs; rel < rel_end; rel++) 950 { 951 unsigned int r_type; 952 unsigned long r_symndx; 953 struct elf_link_hash_entry *h; 954 955 r_symndx = ELF32_R_SYM (rel->r_info); 956 r_type = ELF32_R_TYPE (rel->r_info); 957 958 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 959 { 960 (*_bfd_error_handler) (_("%B: bad symbol index: %d"), 961 abfd, 962 r_symndx); 963 return FALSE; 964 } 965 966 if (r_symndx < symtab_hdr->sh_info) 967 h = NULL; 968 else 969 { 970 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 971 while (h->root.type == bfd_link_hash_indirect 972 || h->root.type == bfd_link_hash_warning) 973 h = (struct elf_link_hash_entry *) h->root.u.i.link; 974 } 975 976 r_type = elf_i386_tls_transition (info, r_type, h == NULL); 977 978 switch (r_type) 979 { 980 case R_386_TLS_LDM: 981 htab->tls_ldm_got.refcount += 1; 982 goto create_got; 983 984 case R_386_PLT32: 985 /* This symbol requires a procedure linkage table entry. We 986 actually build the entry in adjust_dynamic_symbol, 987 because this might be a case of linking PIC code which is 988 never referenced by a dynamic object, in which case we 989 don't need to generate a procedure linkage table entry 990 after all. */ 991 992 /* If this is a local symbol, we resolve it directly without 993 creating a procedure linkage table entry. */ 994 if (h == NULL) 995 continue; 996 997 h->needs_plt = 1; 998 h->plt.refcount += 1; 999 break; 1000 1001 case R_386_TLS_IE_32: 1002 case R_386_TLS_IE: 1003 case R_386_TLS_GOTIE: 1004 if (info->shared) 1005 info->flags |= DF_STATIC_TLS; 1006 /* Fall through */ 1007 1008 case R_386_GOT32: 1009 case R_386_TLS_GD: 1010 case R_386_TLS_GOTDESC: 1011 case R_386_TLS_DESC_CALL: 1012 /* This symbol requires a global offset table entry. */ 1013 { 1014 int tls_type, old_tls_type; 1015 1016 switch (r_type) 1017 { 1018 default: 1019 case R_386_GOT32: tls_type = GOT_NORMAL; break; 1020 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; 1021 case R_386_TLS_GOTDESC: 1022 case R_386_TLS_DESC_CALL: 1023 tls_type = GOT_TLS_GDESC; break; 1024 case R_386_TLS_IE_32: 1025 if (ELF32_R_TYPE (rel->r_info) == r_type) 1026 tls_type = GOT_TLS_IE_NEG; 1027 else 1028 /* If this is a GD->IE transition, we may use either of 1029 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ 1030 tls_type = GOT_TLS_IE; 1031 break; 1032 case R_386_TLS_IE: 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 && old_tls_type != GOT_UNKNOWN 1073 && (! GOT_TLS_GD_ANY_P (old_tls_type) 1074 || (tls_type & GOT_TLS_IE) == 0)) 1075 { 1076 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type)) 1077 tls_type = old_tls_type; 1078 else if (GOT_TLS_GD_ANY_P (old_tls_type) 1079 && GOT_TLS_GD_ANY_P (tls_type)) 1080 tls_type |= old_tls_type; 1081 else 1082 { 1083 (*_bfd_error_handler) 1084 (_("%B: `%s' accessed both as normal and " 1085 "thread local symbol"), 1086 abfd, 1087 h ? h->root.root.string : "<local>"); 1088 return FALSE; 1089 } 1090 } 1091 1092 if (old_tls_type != tls_type) 1093 { 1094 if (h != NULL) 1095 elf_i386_hash_entry (h)->tls_type = tls_type; 1096 else 1097 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type; 1098 } 1099 } 1100 /* Fall through */ 1101 1102 case R_386_GOTOFF: 1103 case R_386_GOTPC: 1104 create_got: 1105 if (htab->sgot == NULL) 1106 { 1107 if (htab->elf.dynobj == NULL) 1108 htab->elf.dynobj = abfd; 1109 if (!create_got_section (htab->elf.dynobj, info)) 1110 return FALSE; 1111 } 1112 if (r_type != R_386_TLS_IE) 1113 break; 1114 /* Fall through */ 1115 1116 case R_386_TLS_LE_32: 1117 case R_386_TLS_LE: 1118 if (!info->shared) 1119 break; 1120 info->flags |= DF_STATIC_TLS; 1121 /* Fall through */ 1122 1123 case R_386_32: 1124 case R_386_PC32: 1125 if (h != NULL && !info->shared) 1126 { 1127 /* If this reloc is in a read-only section, we might 1128 need a copy reloc. We can't check reliably at this 1129 stage whether the section is read-only, as input 1130 sections have not yet been mapped to output sections. 1131 Tentatively set the flag for now, and correct in 1132 adjust_dynamic_symbol. */ 1133 h->non_got_ref = 1; 1134 1135 /* We may need a .plt entry if the function this reloc 1136 refers to is in a shared lib. */ 1137 h->plt.refcount += 1; 1138 if (r_type != R_386_PC32) 1139 h->pointer_equality_needed = 1; 1140 } 1141 1142 /* If we are creating a shared library, and this is a reloc 1143 against a global symbol, or a non PC relative reloc 1144 against a local symbol, then we need to copy the reloc 1145 into the shared library. However, if we are linking with 1146 -Bsymbolic, we do not need to copy a reloc against a 1147 global symbol which is defined in an object we are 1148 including in the link (i.e., DEF_REGULAR is set). At 1149 this point we have not seen all the input files, so it is 1150 possible that DEF_REGULAR is not set now but will be set 1151 later (it is never cleared). In case of a weak definition, 1152 DEF_REGULAR may be cleared later by a strong definition in 1153 a shared library. We account for that possibility below by 1154 storing information in the relocs_copied field of the hash 1155 table entry. A similar situation occurs when creating 1156 shared libraries and symbol visibility changes render the 1157 symbol local. 1158 1159 If on the other hand, we are creating an executable, we 1160 may need to keep relocations for symbols satisfied by a 1161 dynamic library if we manage to avoid copy relocs for the 1162 symbol. */ 1163 if ((info->shared 1164 && (sec->flags & SEC_ALLOC) != 0 1165 && (r_type != R_386_PC32 1166 || (h != NULL 1167 && (! SYMBOLIC_BIND (info, h) 1168 || h->root.type == bfd_link_hash_defweak 1169 || !h->def_regular)))) 1170 || (ELIMINATE_COPY_RELOCS 1171 && !info->shared 1172 && (sec->flags & SEC_ALLOC) != 0 1173 && h != NULL 1174 && (h->root.type == bfd_link_hash_defweak 1175 || !h->def_regular))) 1176 { 1177 struct elf_i386_dyn_relocs *p; 1178 struct elf_i386_dyn_relocs **head; 1179 1180 /* We must copy these reloc types into the output file. 1181 Create a reloc section in dynobj and make room for 1182 this reloc. */ 1183 if (sreloc == NULL) 1184 { 1185 const char *name; 1186 bfd *dynobj; 1187 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx; 1188 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name; 1189 1190 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam); 1191 if (name == NULL) 1192 return FALSE; 1193 1194 if (! CONST_STRNEQ (name, ".rel") 1195 || strcmp (bfd_get_section_name (abfd, sec), 1196 name + 4) != 0) 1197 { 1198 (*_bfd_error_handler) 1199 (_("%B: bad relocation section name `%s\'"), 1200 abfd, name); 1201 } 1202 1203 if (htab->elf.dynobj == NULL) 1204 htab->elf.dynobj = abfd; 1205 1206 dynobj = htab->elf.dynobj; 1207 sreloc = bfd_get_section_by_name (dynobj, name); 1208 if (sreloc == NULL) 1209 { 1210 flagword flags; 1211 1212 flags = (SEC_HAS_CONTENTS | SEC_READONLY 1213 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 1214 if ((sec->flags & SEC_ALLOC) != 0) 1215 flags |= SEC_ALLOC | SEC_LOAD; 1216 sreloc = bfd_make_section_with_flags (dynobj, 1217 name, 1218 flags); 1219 if (sreloc == NULL 1220 || ! bfd_set_section_alignment (dynobj, sreloc, 2)) 1221 return FALSE; 1222 } 1223 elf_section_data (sec)->sreloc = sreloc; 1224 } 1225 1226 /* If this is a global symbol, we count the number of 1227 relocations we need for this symbol. */ 1228 if (h != NULL) 1229 { 1230 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs; 1231 } 1232 else 1233 { 1234 void **vpp; 1235 /* Track dynamic relocs needed for local syms too. 1236 We really need local syms available to do this 1237 easily. Oh well. */ 1238 1239 asection *s; 1240 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 1241 sec, r_symndx); 1242 if (s == NULL) 1243 return FALSE; 1244 1245 vpp = &elf_section_data (s)->local_dynrel; 1246 head = (struct elf_i386_dyn_relocs **)vpp; 1247 } 1248 1249 p = *head; 1250 if (p == NULL || p->sec != sec) 1251 { 1252 bfd_size_type amt = sizeof *p; 1253 p = bfd_alloc (htab->elf.dynobj, amt); 1254 if (p == NULL) 1255 return FALSE; 1256 p->next = *head; 1257 *head = p; 1258 p->sec = sec; 1259 p->count = 0; 1260 p->pc_count = 0; 1261 } 1262 1263 p->count += 1; 1264 if (r_type == R_386_PC32) 1265 p->pc_count += 1; 1266 } 1267 break; 1268 1269 /* This relocation describes the C++ object vtable hierarchy. 1270 Reconstruct it for later use during GC. */ 1271 case R_386_GNU_VTINHERIT: 1272 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1273 return FALSE; 1274 break; 1275 1276 /* This relocation describes which C++ vtable entries are actually 1277 used. Record for later use during GC. */ 1278 case R_386_GNU_VTENTRY: 1279 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 1280 return FALSE; 1281 break; 1282 1283 default: 1284 break; 1285 } 1286 } 1287 1288 return TRUE; 1289} 1290 1291/* Return the section that should be marked against GC for a given 1292 relocation. */ 1293 1294static asection * 1295elf_i386_gc_mark_hook (asection *sec, 1296 struct bfd_link_info *info, 1297 Elf_Internal_Rela *rel, 1298 struct elf_link_hash_entry *h, 1299 Elf_Internal_Sym *sym) 1300{ 1301 if (h != NULL) 1302 switch (ELF32_R_TYPE (rel->r_info)) 1303 { 1304 case R_386_GNU_VTINHERIT: 1305 case R_386_GNU_VTENTRY: 1306 return NULL; 1307 } 1308 1309 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); 1310} 1311 1312/* Update the got entry reference counts for the section being removed. */ 1313 1314static bfd_boolean 1315elf_i386_gc_sweep_hook (bfd *abfd, 1316 struct bfd_link_info *info, 1317 asection *sec, 1318 const Elf_Internal_Rela *relocs) 1319{ 1320 Elf_Internal_Shdr *symtab_hdr; 1321 struct elf_link_hash_entry **sym_hashes; 1322 bfd_signed_vma *local_got_refcounts; 1323 const Elf_Internal_Rela *rel, *relend; 1324 1325 elf_section_data (sec)->local_dynrel = NULL; 1326 1327 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1328 sym_hashes = elf_sym_hashes (abfd); 1329 local_got_refcounts = elf_local_got_refcounts (abfd); 1330 1331 relend = relocs + sec->reloc_count; 1332 for (rel = relocs; rel < relend; rel++) 1333 { 1334 unsigned long r_symndx; 1335 unsigned int r_type; 1336 struct elf_link_hash_entry *h = NULL; 1337 1338 r_symndx = ELF32_R_SYM (rel->r_info); 1339 if (r_symndx >= symtab_hdr->sh_info) 1340 { 1341 struct elf_i386_link_hash_entry *eh; 1342 struct elf_i386_dyn_relocs **pp; 1343 struct elf_i386_dyn_relocs *p; 1344 1345 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1346 while (h->root.type == bfd_link_hash_indirect 1347 || h->root.type == bfd_link_hash_warning) 1348 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1349 eh = (struct elf_i386_link_hash_entry *) h; 1350 1351 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1352 if (p->sec == sec) 1353 { 1354 /* Everything must go for SEC. */ 1355 *pp = p->next; 1356 break; 1357 } 1358 } 1359 1360 r_type = ELF32_R_TYPE (rel->r_info); 1361 r_type = elf_i386_tls_transition (info, r_type, h != NULL); 1362 switch (r_type) 1363 { 1364 case R_386_TLS_LDM: 1365 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0) 1366 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1; 1367 break; 1368 1369 case R_386_TLS_GD: 1370 case R_386_TLS_GOTDESC: 1371 case R_386_TLS_DESC_CALL: 1372 case R_386_TLS_IE_32: 1373 case R_386_TLS_IE: 1374 case R_386_TLS_GOTIE: 1375 case R_386_GOT32: 1376 if (h != NULL) 1377 { 1378 if (h->got.refcount > 0) 1379 h->got.refcount -= 1; 1380 } 1381 else if (local_got_refcounts != NULL) 1382 { 1383 if (local_got_refcounts[r_symndx] > 0) 1384 local_got_refcounts[r_symndx] -= 1; 1385 } 1386 break; 1387 1388 case R_386_32: 1389 case R_386_PC32: 1390 if (info->shared) 1391 break; 1392 /* Fall through */ 1393 1394 case R_386_PLT32: 1395 if (h != NULL) 1396 { 1397 if (h->plt.refcount > 0) 1398 h->plt.refcount -= 1; 1399 } 1400 break; 1401 1402 default: 1403 break; 1404 } 1405 } 1406 1407 return TRUE; 1408} 1409 1410/* Adjust a symbol defined by a dynamic object and referenced by a 1411 regular object. The current definition is in some section of the 1412 dynamic object, but we're not including those sections. We have to 1413 change the definition to something the rest of the link can 1414 understand. */ 1415 1416static bfd_boolean 1417elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info, 1418 struct elf_link_hash_entry *h) 1419{ 1420 struct elf_i386_link_hash_table *htab; 1421 asection *s; 1422 1423 /* If this is a function, put it in the procedure linkage table. We 1424 will fill in the contents of the procedure linkage table later, 1425 when we know the address of the .got section. */ 1426 if (h->type == STT_FUNC 1427 || h->needs_plt) 1428 { 1429 if (h->plt.refcount <= 0 1430 || SYMBOL_CALLS_LOCAL (info, h) 1431 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1432 && h->root.type == bfd_link_hash_undefweak)) 1433 { 1434 /* This case can occur if we saw a PLT32 reloc in an input 1435 file, but the symbol was never referred to by a dynamic 1436 object, or if all references were garbage collected. In 1437 such a case, we don't actually need to build a procedure 1438 linkage table, and we can just do a PC32 reloc instead. */ 1439 h->plt.offset = (bfd_vma) -1; 1440 h->needs_plt = 0; 1441 } 1442 1443 return TRUE; 1444 } 1445 else 1446 /* It's possible that we incorrectly decided a .plt reloc was 1447 needed for an R_386_PC32 reloc to a non-function sym in 1448 check_relocs. We can't decide accurately between function and 1449 non-function syms in check-relocs; Objects loaded later in 1450 the link may change h->type. So fix it now. */ 1451 h->plt.offset = (bfd_vma) -1; 1452 1453 /* If this is a weak symbol, and there is a real definition, the 1454 processor independent code will have arranged for us to see the 1455 real definition first, and we can just use the same value. */ 1456 if (h->u.weakdef != NULL) 1457 { 1458 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 1459 || h->u.weakdef->root.type == bfd_link_hash_defweak); 1460 h->root.u.def.section = h->u.weakdef->root.u.def.section; 1461 h->root.u.def.value = h->u.weakdef->root.u.def.value; 1462 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1463 h->non_got_ref = h->u.weakdef->non_got_ref; 1464 return TRUE; 1465 } 1466 1467 /* This is a reference to a symbol defined by a dynamic object which 1468 is not a function. */ 1469 1470 /* If we are creating a shared library, we must presume that the 1471 only references to the symbol are via the global offset table. 1472 For such cases we need not do anything here; the relocations will 1473 be handled correctly by relocate_section. */ 1474 if (info->shared) 1475 return TRUE; 1476 1477 /* If there are no references to this symbol that do not use the 1478 GOT, we don't need to generate a copy reloc. */ 1479 if (!h->non_got_ref) 1480 return TRUE; 1481 1482 /* If -z nocopyreloc was given, we won't generate them either. */ 1483 if (info->nocopyreloc) 1484 { 1485 h->non_got_ref = 0; 1486 return TRUE; 1487 } 1488 1489 htab = elf_i386_hash_table (info); 1490 1491 /* If there aren't any dynamic relocs in read-only sections, then 1492 we can keep the dynamic relocs and avoid the copy reloc. This 1493 doesn't work on VxWorks, where we can not have dynamic relocations 1494 (other than copy and jump slot relocations) in an executable. */ 1495 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks) 1496 { 1497 struct elf_i386_link_hash_entry * eh; 1498 struct elf_i386_dyn_relocs *p; 1499 1500 eh = (struct elf_i386_link_hash_entry *) h; 1501 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1502 { 1503 s = p->sec->output_section; 1504 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1505 break; 1506 } 1507 1508 if (p == NULL) 1509 { 1510 h->non_got_ref = 0; 1511 return TRUE; 1512 } 1513 } 1514 1515 if (h->size == 0) 1516 { 1517 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 1518 h->root.root.string); 1519 return TRUE; 1520 } 1521 1522 /* We must allocate the symbol in our .dynbss section, which will 1523 become part of the .bss section of the executable. There will be 1524 an entry for this symbol in the .dynsym section. The dynamic 1525 object will contain position independent code, so all references 1526 from the dynamic object to this symbol will go through the global 1527 offset table. The dynamic linker will use the .dynsym entry to 1528 determine the address it must put in the global offset table, so 1529 both the dynamic object and the regular object will refer to the 1530 same memory location for the variable. */ 1531 1532 /* We must generate a R_386_COPY reloc to tell the dynamic linker to 1533 copy the initial value out of the dynamic object and into the 1534 runtime process image. */ 1535 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1536 { 1537 htab->srelbss->size += sizeof (Elf32_External_Rel); 1538 h->needs_copy = 1; 1539 } 1540 1541 s = htab->sdynbss; 1542 1543 return _bfd_elf_adjust_dynamic_copy (h, s); 1544} 1545 1546/* Allocate space in .plt, .got and associated reloc sections for 1547 dynamic relocs. */ 1548 1549static bfd_boolean 1550allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) 1551{ 1552 struct bfd_link_info *info; 1553 struct elf_i386_link_hash_table *htab; 1554 struct elf_i386_link_hash_entry *eh; 1555 struct elf_i386_dyn_relocs *p; 1556 1557 if (h->root.type == bfd_link_hash_indirect) 1558 return TRUE; 1559 1560 if (h->root.type == bfd_link_hash_warning) 1561 /* When warning symbols are created, they **replace** the "real" 1562 entry in the hash table, thus we never get to see the real 1563 symbol in a hash traversal. So look at it now. */ 1564 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1565 1566 info = (struct bfd_link_info *) inf; 1567 htab = elf_i386_hash_table (info); 1568 1569 if (htab->elf.dynamic_sections_created 1570 && h->plt.refcount > 0) 1571 { 1572 /* Make sure this symbol is output as a dynamic symbol. 1573 Undefined weak syms won't yet be marked as dynamic. */ 1574 if (h->dynindx == -1 1575 && !h->forced_local) 1576 { 1577 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1578 return FALSE; 1579 } 1580 1581 if (info->shared 1582 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1583 { 1584 asection *s = htab->splt; 1585 1586 /* If this is the first .plt entry, make room for the special 1587 first entry. */ 1588 if (s->size == 0) 1589 s->size += PLT_ENTRY_SIZE; 1590 1591 h->plt.offset = s->size; 1592 1593 /* If this symbol is not defined in a regular file, and we are 1594 not generating a shared library, then set the symbol to this 1595 location in the .plt. This is required to make function 1596 pointers compare as equal between the normal executable and 1597 the shared library. */ 1598 if (! info->shared 1599 && !h->def_regular) 1600 { 1601 h->root.u.def.section = s; 1602 h->root.u.def.value = h->plt.offset; 1603 } 1604 1605 /* Make room for this entry. */ 1606 s->size += PLT_ENTRY_SIZE; 1607 1608 /* We also need to make an entry in the .got.plt section, which 1609 will be placed in the .got section by the linker script. */ 1610 htab->sgotplt->size += 4; 1611 1612 /* We also need to make an entry in the .rel.plt section. */ 1613 htab->srelplt->size += sizeof (Elf32_External_Rel); 1614 htab->next_tls_desc_index++; 1615 1616 if (htab->is_vxworks && !info->shared) 1617 { 1618 /* VxWorks has a second set of relocations for each PLT entry 1619 in executables. They go in a separate relocation section, 1620 which is processed by the kernel loader. */ 1621 1622 /* There are two relocations for the initial PLT entry: an 1623 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an 1624 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ 1625 1626 if (h->plt.offset == PLT_ENTRY_SIZE) 1627 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); 1628 1629 /* There are two extra relocations for each subsequent PLT entry: 1630 an R_386_32 relocation for the GOT entry, and an R_386_32 1631 relocation for the PLT entry. */ 1632 1633 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); 1634 } 1635 } 1636 else 1637 { 1638 h->plt.offset = (bfd_vma) -1; 1639 h->needs_plt = 0; 1640 } 1641 } 1642 else 1643 { 1644 h->plt.offset = (bfd_vma) -1; 1645 h->needs_plt = 0; 1646 } 1647 1648 eh = (struct elf_i386_link_hash_entry *) h; 1649 eh->tlsdesc_got = (bfd_vma) -1; 1650 1651 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary, 1652 make it a R_386_TLS_LE_32 requiring no TLS entry. */ 1653 if (h->got.refcount > 0 1654 && !info->shared 1655 && h->dynindx == -1 1656 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE)) 1657 h->got.offset = (bfd_vma) -1; 1658 else if (h->got.refcount > 0) 1659 { 1660 asection *s; 1661 bfd_boolean dyn; 1662 int tls_type = elf_i386_hash_entry(h)->tls_type; 1663 1664 /* Make sure this symbol is output as a dynamic symbol. 1665 Undefined weak syms won't yet be marked as dynamic. */ 1666 if (h->dynindx == -1 1667 && !h->forced_local) 1668 { 1669 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1670 return FALSE; 1671 } 1672 1673 s = htab->sgot; 1674 if (GOT_TLS_GDESC_P (tls_type)) 1675 { 1676 eh->tlsdesc_got = htab->sgotplt->size 1677 - elf_i386_compute_jump_table_size (htab); 1678 htab->sgotplt->size += 8; 1679 h->got.offset = (bfd_vma) -2; 1680 } 1681 if (! GOT_TLS_GDESC_P (tls_type) 1682 || GOT_TLS_GD_P (tls_type)) 1683 { 1684 h->got.offset = s->size; 1685 s->size += 4; 1686 /* R_386_TLS_GD needs 2 consecutive GOT slots. */ 1687 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH) 1688 s->size += 4; 1689 } 1690 dyn = htab->elf.dynamic_sections_created; 1691 /* R_386_TLS_IE_32 needs one dynamic relocation, 1692 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, 1693 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we 1694 need two), R_386_TLS_GD needs one if local symbol and two if 1695 global. */ 1696 if (tls_type == GOT_TLS_IE_BOTH) 1697 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel); 1698 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) 1699 || (tls_type & GOT_TLS_IE)) 1700 htab->srelgot->size += sizeof (Elf32_External_Rel); 1701 else if (GOT_TLS_GD_P (tls_type)) 1702 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel); 1703 else if (! GOT_TLS_GDESC_P (tls_type) 1704 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1705 || h->root.type != bfd_link_hash_undefweak) 1706 && (info->shared 1707 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1708 htab->srelgot->size += sizeof (Elf32_External_Rel); 1709 if (GOT_TLS_GDESC_P (tls_type)) 1710 htab->srelplt->size += sizeof (Elf32_External_Rel); 1711 } 1712 else 1713 h->got.offset = (bfd_vma) -1; 1714 1715 if (eh->dyn_relocs == NULL) 1716 return TRUE; 1717 1718 /* In the shared -Bsymbolic case, discard space allocated for 1719 dynamic pc-relative relocs against symbols which turn out to be 1720 defined in regular objects. For the normal shared case, discard 1721 space for pc-relative relocs that have become local due to symbol 1722 visibility changes. */ 1723 1724 if (info->shared) 1725 { 1726 /* The only reloc that uses pc_count is R_386_PC32, which will 1727 appear on a call or on something like ".long foo - .". We 1728 want calls to protected symbols to resolve directly to the 1729 function rather than going via the plt. If people want 1730 function pointer comparisons to work as expected then they 1731 should avoid writing assembly like ".long foo - .". */ 1732 if (SYMBOL_CALLS_LOCAL (info, h)) 1733 { 1734 struct elf_i386_dyn_relocs **pp; 1735 1736 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1737 { 1738 p->count -= p->pc_count; 1739 p->pc_count = 0; 1740 if (p->count == 0) 1741 *pp = p->next; 1742 else 1743 pp = &p->next; 1744 } 1745 } 1746 1747 /* Also discard relocs on undefined weak syms with non-default 1748 visibility. */ 1749 if (eh->dyn_relocs != NULL 1750 && h->root.type == bfd_link_hash_undefweak) 1751 { 1752 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 1753 eh->dyn_relocs = NULL; 1754 1755 /* Make sure undefined weak symbols are output as a dynamic 1756 symbol in PIEs. */ 1757 else if (h->dynindx == -1 1758 && !h->forced_local) 1759 { 1760 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1761 return FALSE; 1762 } 1763 } 1764 } 1765 else if (ELIMINATE_COPY_RELOCS) 1766 { 1767 /* For the non-shared case, discard space for relocs against 1768 symbols which turn out to need copy relocs or are not 1769 dynamic. */ 1770 1771 if (!h->non_got_ref 1772 && ((h->def_dynamic 1773 && !h->def_regular) 1774 || (htab->elf.dynamic_sections_created 1775 && (h->root.type == bfd_link_hash_undefweak 1776 || h->root.type == bfd_link_hash_undefined)))) 1777 { 1778 /* Make sure this symbol is output as a dynamic symbol. 1779 Undefined weak syms won't yet be marked as dynamic. */ 1780 if (h->dynindx == -1 1781 && !h->forced_local) 1782 { 1783 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1784 return FALSE; 1785 } 1786 1787 /* If that succeeded, we know we'll be keeping all the 1788 relocs. */ 1789 if (h->dynindx != -1) 1790 goto keep; 1791 } 1792 1793 eh->dyn_relocs = NULL; 1794 1795 keep: ; 1796 } 1797 1798 /* Finally, allocate space. */ 1799 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1800 { 1801 asection *sreloc = elf_section_data (p->sec)->sreloc; 1802 sreloc->size += p->count * sizeof (Elf32_External_Rel); 1803 } 1804 1805 return TRUE; 1806} 1807 1808/* Find any dynamic relocs that apply to read-only sections. */ 1809 1810static bfd_boolean 1811readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) 1812{ 1813 struct elf_i386_link_hash_entry *eh; 1814 struct elf_i386_dyn_relocs *p; 1815 1816 if (h->root.type == bfd_link_hash_warning) 1817 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1818 1819 eh = (struct elf_i386_link_hash_entry *) h; 1820 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1821 { 1822 asection *s = p->sec->output_section; 1823 1824 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1825 { 1826 struct bfd_link_info *info = (struct bfd_link_info *) inf; 1827 1828 info->flags |= DF_TEXTREL; 1829 1830 /* Not an error, just cut short the traversal. */ 1831 return FALSE; 1832 } 1833 } 1834 return TRUE; 1835} 1836 1837/* Set the sizes of the dynamic sections. */ 1838 1839static bfd_boolean 1840elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 1841 struct bfd_link_info *info) 1842{ 1843 struct elf_i386_link_hash_table *htab; 1844 bfd *dynobj; 1845 asection *s; 1846 bfd_boolean relocs; 1847 bfd *ibfd; 1848 1849 htab = elf_i386_hash_table (info); 1850 dynobj = htab->elf.dynobj; 1851 if (dynobj == NULL) 1852 abort (); 1853 1854 if (htab->elf.dynamic_sections_created) 1855 { 1856 /* Set the contents of the .interp section to the interpreter. */ 1857 if (info->executable) 1858 { 1859 s = bfd_get_section_by_name (dynobj, ".interp"); 1860 if (s == NULL) 1861 abort (); 1862 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 1863 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1864 } 1865 } 1866 1867 /* Set up .got offsets for local syms, and space for local dynamic 1868 relocs. */ 1869 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 1870 { 1871 bfd_signed_vma *local_got; 1872 bfd_signed_vma *end_local_got; 1873 char *local_tls_type; 1874 bfd_vma *local_tlsdesc_gotent; 1875 bfd_size_type locsymcount; 1876 Elf_Internal_Shdr *symtab_hdr; 1877 asection *srel; 1878 1879 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 1880 continue; 1881 1882 for (s = ibfd->sections; s != NULL; s = s->next) 1883 { 1884 struct elf_i386_dyn_relocs *p; 1885 1886 for (p = ((struct elf_i386_dyn_relocs *) 1887 elf_section_data (s)->local_dynrel); 1888 p != NULL; 1889 p = p->next) 1890 { 1891 if (!bfd_is_abs_section (p->sec) 1892 && bfd_is_abs_section (p->sec->output_section)) 1893 { 1894 /* Input section has been discarded, either because 1895 it is a copy of a linkonce section or due to 1896 linker script /DISCARD/, so we'll be discarding 1897 the relocs too. */ 1898 } 1899 else if (p->count != 0) 1900 { 1901 srel = elf_section_data (p->sec)->sreloc; 1902 srel->size += p->count * sizeof (Elf32_External_Rel); 1903 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 1904 info->flags |= DF_TEXTREL; 1905 } 1906 } 1907 } 1908 1909 local_got = elf_local_got_refcounts (ibfd); 1910 if (!local_got) 1911 continue; 1912 1913 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 1914 locsymcount = symtab_hdr->sh_info; 1915 end_local_got = local_got + locsymcount; 1916 local_tls_type = elf_i386_local_got_tls_type (ibfd); 1917 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd); 1918 s = htab->sgot; 1919 srel = htab->srelgot; 1920 for (; local_got < end_local_got; 1921 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) 1922 { 1923 *local_tlsdesc_gotent = (bfd_vma) -1; 1924 if (*local_got > 0) 1925 { 1926 if (GOT_TLS_GDESC_P (*local_tls_type)) 1927 { 1928 *local_tlsdesc_gotent = htab->sgotplt->size 1929 - elf_i386_compute_jump_table_size (htab); 1930 htab->sgotplt->size += 8; 1931 *local_got = (bfd_vma) -2; 1932 } 1933 if (! GOT_TLS_GDESC_P (*local_tls_type) 1934 || GOT_TLS_GD_P (*local_tls_type)) 1935 { 1936 *local_got = s->size; 1937 s->size += 4; 1938 if (GOT_TLS_GD_P (*local_tls_type) 1939 || *local_tls_type == GOT_TLS_IE_BOTH) 1940 s->size += 4; 1941 } 1942 if (info->shared 1943 || GOT_TLS_GD_ANY_P (*local_tls_type) 1944 || (*local_tls_type & GOT_TLS_IE)) 1945 { 1946 if (*local_tls_type == GOT_TLS_IE_BOTH) 1947 srel->size += 2 * sizeof (Elf32_External_Rel); 1948 else if (GOT_TLS_GD_P (*local_tls_type) 1949 || ! GOT_TLS_GDESC_P (*local_tls_type)) 1950 srel->size += sizeof (Elf32_External_Rel); 1951 if (GOT_TLS_GDESC_P (*local_tls_type)) 1952 htab->srelplt->size += sizeof (Elf32_External_Rel); 1953 } 1954 } 1955 else 1956 *local_got = (bfd_vma) -1; 1957 } 1958 } 1959 1960 if (htab->tls_ldm_got.refcount > 0) 1961 { 1962 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM 1963 relocs. */ 1964 htab->tls_ldm_got.offset = htab->sgot->size; 1965 htab->sgot->size += 8; 1966 htab->srelgot->size += sizeof (Elf32_External_Rel); 1967 } 1968 else 1969 htab->tls_ldm_got.offset = -1; 1970 1971 /* Allocate global sym .plt and .got entries, and space for global 1972 sym dynamic relocs. */ 1973 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); 1974 1975 /* For every jump slot reserved in the sgotplt, reloc_count is 1976 incremented. However, when we reserve space for TLS descriptors, 1977 it's not incremented, so in order to compute the space reserved 1978 for them, it suffices to multiply the reloc count by the jump 1979 slot size. */ 1980 if (htab->srelplt) 1981 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4; 1982 1983 /* We now have determined the sizes of the various dynamic sections. 1984 Allocate memory for them. */ 1985 relocs = FALSE; 1986 for (s = dynobj->sections; s != NULL; s = s->next) 1987 { 1988 bfd_boolean strip_section = TRUE; 1989 1990 if ((s->flags & SEC_LINKER_CREATED) == 0) 1991 continue; 1992 1993 if (s == htab->splt 1994 || s == htab->sgot 1995 || s == htab->sgotplt 1996 || s == htab->sdynbss) 1997 { 1998 /* Strip this section if we don't need it; see the 1999 comment below. */ 2000 /* We'd like to strip these sections if they aren't needed, but if 2001 we've exported dynamic symbols from them we must leave them. 2002 It's too late to tell BFD to get rid of the symbols. */ 2003 2004 if (htab->elf.hplt != NULL) 2005 strip_section = FALSE; 2006 } 2007 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel")) 2008 { 2009 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2) 2010 relocs = TRUE; 2011 2012 /* We use the reloc_count field as a counter if we need 2013 to copy relocs into the output file. */ 2014 s->reloc_count = 0; 2015 } 2016 else 2017 { 2018 /* It's not one of our sections, so don't allocate space. */ 2019 continue; 2020 } 2021 2022 if (s->size == 0) 2023 { 2024 /* If we don't need this section, strip it from the 2025 output file. This is mostly to handle .rel.bss and 2026 .rel.plt. We must create both sections in 2027 create_dynamic_sections, because they must be created 2028 before the linker maps input sections to output 2029 sections. The linker does that before 2030 adjust_dynamic_symbol is called, and it is that 2031 function which decides whether anything needs to go 2032 into these sections. */ 2033 if (strip_section) 2034 s->flags |= SEC_EXCLUDE; 2035 continue; 2036 } 2037 2038 if ((s->flags & SEC_HAS_CONTENTS) == 0) 2039 continue; 2040 2041 /* Allocate memory for the section contents. We use bfd_zalloc 2042 here in case unused entries are not reclaimed before the 2043 section's contents are written out. This should not happen, 2044 but this way if it does, we get a R_386_NONE reloc instead 2045 of garbage. */ 2046 s->contents = bfd_zalloc (dynobj, s->size); 2047 if (s->contents == NULL) 2048 return FALSE; 2049 } 2050 2051 if (htab->elf.dynamic_sections_created) 2052 { 2053 /* Add some entries to the .dynamic section. We fill in the 2054 values later, in elf_i386_finish_dynamic_sections, but we 2055 must add the entries now so that we get the correct size for 2056 the .dynamic section. The DT_DEBUG entry is filled in by the 2057 dynamic linker and used by the debugger. */ 2058#define add_dynamic_entry(TAG, VAL) \ 2059 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 2060 2061 if (info->executable) 2062 { 2063 if (!add_dynamic_entry (DT_DEBUG, 0)) 2064 return FALSE; 2065 } 2066 2067 if (htab->splt->size != 0) 2068 { 2069 if (!add_dynamic_entry (DT_PLTGOT, 0) 2070 || !add_dynamic_entry (DT_PLTRELSZ, 0) 2071 || !add_dynamic_entry (DT_PLTREL, DT_REL) 2072 || !add_dynamic_entry (DT_JMPREL, 0)) 2073 return FALSE; 2074 } 2075 2076 if (relocs) 2077 { 2078 if (!add_dynamic_entry (DT_REL, 0) 2079 || !add_dynamic_entry (DT_RELSZ, 0) 2080 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) 2081 return FALSE; 2082 2083 /* If any dynamic relocs apply to a read-only section, 2084 then we need a DT_TEXTREL entry. */ 2085 if ((info->flags & DF_TEXTREL) == 0) 2086 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, 2087 (PTR) info); 2088 2089 if ((info->flags & DF_TEXTREL) != 0) 2090 { 2091 if (!add_dynamic_entry (DT_TEXTREL, 0)) 2092 return FALSE; 2093 } 2094 } 2095 } 2096#undef add_dynamic_entry 2097 2098 return TRUE; 2099} 2100 2101static bfd_boolean 2102elf_i386_always_size_sections (bfd *output_bfd, 2103 struct bfd_link_info *info) 2104{ 2105 asection *tls_sec = elf_hash_table (info)->tls_sec; 2106 2107 if (tls_sec) 2108 { 2109 struct elf_link_hash_entry *tlsbase; 2110 2111 tlsbase = elf_link_hash_lookup (elf_hash_table (info), 2112 "_TLS_MODULE_BASE_", 2113 FALSE, FALSE, FALSE); 2114 2115 if (tlsbase && tlsbase->type == STT_TLS) 2116 { 2117 struct bfd_link_hash_entry *bh = NULL; 2118 const struct elf_backend_data *bed 2119 = get_elf_backend_data (output_bfd); 2120 2121 if (!(_bfd_generic_link_add_one_symbol 2122 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, 2123 tls_sec, 0, NULL, FALSE, 2124 bed->collect, &bh))) 2125 return FALSE; 2126 tlsbase = (struct elf_link_hash_entry *)bh; 2127 tlsbase->def_regular = 1; 2128 tlsbase->other = STV_HIDDEN; 2129 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); 2130 } 2131 } 2132 2133 return TRUE; 2134} 2135 2136/* Set the correct type for an x86 ELF section. We do this by the 2137 section name, which is a hack, but ought to work. */ 2138 2139static bfd_boolean 2140elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, 2141 Elf_Internal_Shdr *hdr, 2142 asection *sec) 2143{ 2144 register const char *name; 2145 2146 name = bfd_get_section_name (abfd, sec); 2147 2148 /* This is an ugly, but unfortunately necessary hack that is 2149 needed when producing EFI binaries on x86. It tells 2150 elf.c:elf_fake_sections() not to consider ".reloc" as a section 2151 containing ELF relocation info. We need this hack in order to 2152 be able to generate ELF binaries that can be translated into 2153 EFI applications (which are essentially COFF objects). Those 2154 files contain a COFF ".reloc" section inside an ELFNN object, 2155 which would normally cause BFD to segfault because it would 2156 attempt to interpret this section as containing relocation 2157 entries for section "oc". With this hack enabled, ".reloc" 2158 will be treated as a normal data section, which will avoid the 2159 segfault. However, you won't be able to create an ELFNN binary 2160 with a section named "oc" that needs relocations, but that's 2161 the kind of ugly side-effects you get when detecting section 2162 types based on their names... In practice, this limitation is 2163 unlikely to bite. */ 2164 if (strcmp (name, ".reloc") == 0) 2165 hdr->sh_type = SHT_PROGBITS; 2166 2167 return TRUE; 2168} 2169 2170/* Return the base VMA address which should be subtracted from real addresses 2171 when resolving @dtpoff relocation. 2172 This is PT_TLS segment p_vaddr. */ 2173 2174static bfd_vma 2175dtpoff_base (struct bfd_link_info *info) 2176{ 2177 /* If tls_sec is NULL, we should have signalled an error already. */ 2178 if (elf_hash_table (info)->tls_sec == NULL) 2179 return 0; 2180 return elf_hash_table (info)->tls_sec->vma; 2181} 2182 2183/* Return the relocation value for @tpoff relocation 2184 if STT_TLS virtual address is ADDRESS. */ 2185 2186static bfd_vma 2187tpoff (struct bfd_link_info *info, bfd_vma address) 2188{ 2189 struct elf_link_hash_table *htab = elf_hash_table (info); 2190 2191 /* If tls_sec is NULL, we should have signalled an error already. */ 2192 if (htab->tls_sec == NULL) 2193 return 0; 2194 return htab->tls_size + htab->tls_sec->vma - address; 2195} 2196 2197/* Relocate an i386 ELF section. */ 2198 2199static bfd_boolean 2200elf_i386_relocate_section (bfd *output_bfd, 2201 struct bfd_link_info *info, 2202 bfd *input_bfd, 2203 asection *input_section, 2204 bfd_byte *contents, 2205 Elf_Internal_Rela *relocs, 2206 Elf_Internal_Sym *local_syms, 2207 asection **local_sections) 2208{ 2209 struct elf_i386_link_hash_table *htab; 2210 Elf_Internal_Shdr *symtab_hdr; 2211 struct elf_link_hash_entry **sym_hashes; 2212 bfd_vma *local_got_offsets; 2213 bfd_vma *local_tlsdesc_gotents; 2214 Elf_Internal_Rela *rel; 2215 Elf_Internal_Rela *relend; 2216 2217 htab = elf_i386_hash_table (info); 2218 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2219 sym_hashes = elf_sym_hashes (input_bfd); 2220 local_got_offsets = elf_local_got_offsets (input_bfd); 2221 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd); 2222 2223 rel = relocs; 2224 relend = relocs + input_section->reloc_count; 2225 for (; rel < relend; rel++) 2226 { 2227 unsigned int r_type; 2228 reloc_howto_type *howto; 2229 unsigned long r_symndx; 2230 struct elf_link_hash_entry *h; 2231 Elf_Internal_Sym *sym; 2232 asection *sec; 2233 bfd_vma off, offplt; 2234 bfd_vma relocation; 2235 bfd_boolean unresolved_reloc; 2236 bfd_reloc_status_type r; 2237 unsigned int indx; 2238 int tls_type; 2239 2240 r_type = ELF32_R_TYPE (rel->r_info); 2241 if (r_type == R_386_GNU_VTINHERIT 2242 || r_type == R_386_GNU_VTENTRY) 2243 continue; 2244 2245 if ((indx = r_type) >= R_386_standard 2246 && ((indx = r_type - R_386_ext_offset) - R_386_standard 2247 >= R_386_ext - R_386_standard) 2248 && ((indx = r_type - R_386_tls_offset) - R_386_ext 2249 >= R_386_tls - R_386_ext)) 2250 { 2251 (*_bfd_error_handler) 2252 (_("%B: unrecognized relocation (0x%x) in section `%A'"), 2253 input_bfd, input_section, r_type); 2254 bfd_set_error (bfd_error_bad_value); 2255 return FALSE; 2256 } 2257 howto = elf_howto_table + indx; 2258 2259 r_symndx = ELF32_R_SYM (rel->r_info); 2260 h = NULL; 2261 sym = NULL; 2262 sec = NULL; 2263 unresolved_reloc = FALSE; 2264 if (r_symndx < symtab_hdr->sh_info) 2265 { 2266 sym = local_syms + r_symndx; 2267 sec = local_sections[r_symndx]; 2268 relocation = (sec->output_section->vma 2269 + sec->output_offset 2270 + sym->st_value); 2271 2272 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION 2273 && ((sec->flags & SEC_MERGE) != 0 2274 || (info->relocatable 2275 && sec->output_offset != 0))) 2276 { 2277 bfd_vma addend; 2278 bfd_byte *where = contents + rel->r_offset; 2279 2280 switch (howto->size) 2281 { 2282 case 0: 2283 addend = bfd_get_8 (input_bfd, where); 2284 if (howto->pc_relative) 2285 { 2286 addend = (addend ^ 0x80) - 0x80; 2287 addend += 1; 2288 } 2289 break; 2290 case 1: 2291 addend = bfd_get_16 (input_bfd, where); 2292 if (howto->pc_relative) 2293 { 2294 addend = (addend ^ 0x8000) - 0x8000; 2295 addend += 2; 2296 } 2297 break; 2298 case 2: 2299 addend = bfd_get_32 (input_bfd, where); 2300 if (howto->pc_relative) 2301 { 2302 addend = (addend ^ 0x80000000) - 0x80000000; 2303 addend += 4; 2304 } 2305 break; 2306 default: 2307 abort (); 2308 } 2309 2310 if (info->relocatable) 2311 addend += sec->output_offset; 2312 else 2313 { 2314 asection *msec = sec; 2315 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, 2316 addend); 2317 addend -= relocation; 2318 addend += msec->output_section->vma + msec->output_offset; 2319 } 2320 2321 switch (howto->size) 2322 { 2323 case 0: 2324 /* FIXME: overflow checks. */ 2325 if (howto->pc_relative) 2326 addend -= 1; 2327 bfd_put_8 (input_bfd, addend, where); 2328 break; 2329 case 1: 2330 if (howto->pc_relative) 2331 addend -= 2; 2332 bfd_put_16 (input_bfd, addend, where); 2333 break; 2334 case 2: 2335 if (howto->pc_relative) 2336 addend -= 4; 2337 bfd_put_32 (input_bfd, addend, where); 2338 break; 2339 } 2340 } 2341 } 2342 else 2343 { 2344 bfd_boolean warned; 2345 2346 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2347 r_symndx, symtab_hdr, sym_hashes, 2348 h, sec, relocation, 2349 unresolved_reloc, warned); 2350 } 2351 2352 if (sec != NULL && elf_discarded_section (sec)) 2353 { 2354 /* For relocs against symbols from removed linkonce sections, 2355 or sections discarded by a linker script, we just want the 2356 section contents zeroed. Avoid any special processing. */ 2357 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); 2358 rel->r_info = 0; 2359 rel->r_addend = 0; 2360 continue; 2361 } 2362 2363 if (info->relocatable) 2364 continue; 2365 2366 switch (r_type) 2367 { 2368 case R_386_GOT32: 2369 /* Relocation is to the entry for this symbol in the global 2370 offset table. */ 2371 if (htab->sgot == NULL) 2372 abort (); 2373 2374 if (h != NULL) 2375 { 2376 bfd_boolean dyn; 2377 2378 off = h->got.offset; 2379 dyn = htab->elf.dynamic_sections_created; 2380 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2381 || (info->shared 2382 && SYMBOL_REFERENCES_LOCAL (info, h)) 2383 || (ELF_ST_VISIBILITY (h->other) 2384 && h->root.type == bfd_link_hash_undefweak)) 2385 { 2386 /* This is actually a static link, or it is a 2387 -Bsymbolic link and the symbol is defined 2388 locally, or the symbol was forced to be local 2389 because of a version file. We must initialize 2390 this entry in the global offset table. Since the 2391 offset must always be a multiple of 4, we use the 2392 least significant bit to record whether we have 2393 initialized it already. 2394 2395 When doing a dynamic link, we create a .rel.got 2396 relocation entry to initialize the value. This 2397 is done in the finish_dynamic_symbol routine. */ 2398 if ((off & 1) != 0) 2399 off &= ~1; 2400 else 2401 { 2402 bfd_put_32 (output_bfd, relocation, 2403 htab->sgot->contents + off); 2404 h->got.offset |= 1; 2405 } 2406 } 2407 else 2408 unresolved_reloc = FALSE; 2409 } 2410 else 2411 { 2412 if (local_got_offsets == NULL) 2413 abort (); 2414 2415 off = local_got_offsets[r_symndx]; 2416 2417 /* The offset must always be a multiple of 4. We use 2418 the least significant bit to record whether we have 2419 already generated the necessary reloc. */ 2420 if ((off & 1) != 0) 2421 off &= ~1; 2422 else 2423 { 2424 bfd_put_32 (output_bfd, relocation, 2425 htab->sgot->contents + off); 2426 2427 if (info->shared) 2428 { 2429 asection *s; 2430 Elf_Internal_Rela outrel; 2431 bfd_byte *loc; 2432 2433 s = htab->srelgot; 2434 if (s == NULL) 2435 abort (); 2436 2437 outrel.r_offset = (htab->sgot->output_section->vma 2438 + htab->sgot->output_offset 2439 + off); 2440 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2441 loc = s->contents; 2442 loc += s->reloc_count++ * sizeof (Elf32_External_Rel); 2443 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2444 } 2445 2446 local_got_offsets[r_symndx] |= 1; 2447 } 2448 } 2449 2450 if (off >= (bfd_vma) -2) 2451 abort (); 2452 2453 relocation = htab->sgot->output_section->vma 2454 + htab->sgot->output_offset + off 2455 - htab->sgotplt->output_section->vma 2456 - htab->sgotplt->output_offset; 2457 break; 2458 2459 case R_386_GOTOFF: 2460 /* Relocation is relative to the start of the global offset 2461 table. */ 2462 2463 /* Check to make sure it isn't a protected function symbol 2464 for shared library since it may not be local when used 2465 as function address. */ 2466 if (info->shared 2467 && !info->executable 2468 && h 2469 && h->def_regular 2470 && h->type == STT_FUNC 2471 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) 2472 { 2473 (*_bfd_error_handler) 2474 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"), 2475 input_bfd, h->root.root.string); 2476 bfd_set_error (bfd_error_bad_value); 2477 return FALSE; 2478 } 2479 2480 /* Note that sgot is not involved in this 2481 calculation. We always want the start of .got.plt. If we 2482 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is 2483 permitted by the ABI, we might have to change this 2484 calculation. */ 2485 relocation -= htab->sgotplt->output_section->vma 2486 + htab->sgotplt->output_offset; 2487 break; 2488 2489 case R_386_GOTPC: 2490 /* Use global offset table as symbol value. */ 2491 relocation = htab->sgotplt->output_section->vma 2492 + htab->sgotplt->output_offset; 2493 unresolved_reloc = FALSE; 2494 break; 2495 2496 case R_386_PLT32: 2497 /* Relocation is to the entry for this symbol in the 2498 procedure linkage table. */ 2499 2500 /* Resolve a PLT32 reloc against a local symbol directly, 2501 without using the procedure linkage table. */ 2502 if (h == NULL) 2503 break; 2504 2505 if (h->plt.offset == (bfd_vma) -1 2506 || htab->splt == NULL) 2507 { 2508 /* We didn't make a PLT entry for this symbol. This 2509 happens when statically linking PIC code, or when 2510 using -Bsymbolic. */ 2511 break; 2512 } 2513 2514 relocation = (htab->splt->output_section->vma 2515 + htab->splt->output_offset 2516 + h->plt.offset); 2517 unresolved_reloc = FALSE; 2518 break; 2519 2520 case R_386_32: 2521 case R_386_PC32: 2522 if ((input_section->flags & SEC_ALLOC) == 0) 2523 break; 2524 2525 if ((info->shared 2526 && (h == NULL 2527 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2528 || h->root.type != bfd_link_hash_undefweak) 2529 && (r_type != R_386_PC32 2530 || !SYMBOL_CALLS_LOCAL (info, h))) 2531 || (ELIMINATE_COPY_RELOCS 2532 && !info->shared 2533 && h != NULL 2534 && h->dynindx != -1 2535 && !h->non_got_ref 2536 && ((h->def_dynamic 2537 && !h->def_regular) 2538 || h->root.type == bfd_link_hash_undefweak 2539 || h->root.type == bfd_link_hash_undefined))) 2540 { 2541 Elf_Internal_Rela outrel; 2542 bfd_byte *loc; 2543 bfd_boolean skip, relocate; 2544 asection *sreloc; 2545 2546 /* When generating a shared object, these relocations 2547 are copied into the output file to be resolved at run 2548 time. */ 2549 2550 skip = FALSE; 2551 relocate = FALSE; 2552 2553 outrel.r_offset = 2554 _bfd_elf_section_offset (output_bfd, info, input_section, 2555 rel->r_offset); 2556 if (outrel.r_offset == (bfd_vma) -1) 2557 skip = TRUE; 2558 else if (outrel.r_offset == (bfd_vma) -2) 2559 skip = TRUE, relocate = TRUE; 2560 outrel.r_offset += (input_section->output_section->vma 2561 + input_section->output_offset); 2562 2563 if (skip) 2564 memset (&outrel, 0, sizeof outrel); 2565 else if (h != NULL 2566 && h->dynindx != -1 2567 && (r_type == R_386_PC32 2568 || !info->shared 2569 || !SYMBOLIC_BIND (info, h) 2570 || !h->def_regular)) 2571 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2572 else 2573 { 2574 /* This symbol is local, or marked to become local. */ 2575 relocate = TRUE; 2576 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2577 } 2578 2579 sreloc = elf_section_data (input_section)->sreloc; 2580 if (sreloc == NULL) 2581 abort (); 2582 2583 loc = sreloc->contents; 2584 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 2585 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2586 2587 /* If this reloc is against an external symbol, we do 2588 not want to fiddle with the addend. Otherwise, we 2589 need to include the symbol value so that it becomes 2590 an addend for the dynamic reloc. */ 2591 if (! relocate) 2592 continue; 2593 } 2594 break; 2595 2596 case R_386_TLS_IE: 2597 if (info->shared) 2598 { 2599 Elf_Internal_Rela outrel; 2600 bfd_byte *loc; 2601 asection *sreloc; 2602 2603 outrel.r_offset = rel->r_offset 2604 + input_section->output_section->vma 2605 + input_section->output_offset; 2606 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2607 sreloc = elf_section_data (input_section)->sreloc; 2608 if (sreloc == NULL) 2609 abort (); 2610 loc = sreloc->contents; 2611 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 2612 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2613 } 2614 /* Fall through */ 2615 2616 case R_386_TLS_GD: 2617 case R_386_TLS_GOTDESC: 2618 case R_386_TLS_DESC_CALL: 2619 case R_386_TLS_IE_32: 2620 case R_386_TLS_GOTIE: 2621 r_type = elf_i386_tls_transition (info, r_type, h == NULL); 2622 tls_type = GOT_UNKNOWN; 2623 if (h == NULL && local_got_offsets) 2624 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx]; 2625 else if (h != NULL) 2626 { 2627 tls_type = elf_i386_hash_entry(h)->tls_type; 2628 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE)) 2629 r_type = R_386_TLS_LE_32; 2630 } 2631 if (tls_type == GOT_TLS_IE) 2632 tls_type = GOT_TLS_IE_NEG; 2633 if (r_type == R_386_TLS_GD 2634 || r_type == R_386_TLS_GOTDESC 2635 || r_type == R_386_TLS_DESC_CALL) 2636 { 2637 if (tls_type == GOT_TLS_IE_POS) 2638 r_type = R_386_TLS_GOTIE; 2639 else if (tls_type & GOT_TLS_IE) 2640 r_type = R_386_TLS_IE_32; 2641 } 2642 2643 if (r_type == R_386_TLS_LE_32) 2644 { 2645 BFD_ASSERT (! unresolved_reloc); 2646 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) 2647 { 2648 unsigned int val, type; 2649 bfd_vma roff; 2650 2651 /* GD->LE transition. */ 2652 BFD_ASSERT (rel->r_offset >= 2); 2653 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 2654 BFD_ASSERT (type == 0x8d || type == 0x04); 2655 BFD_ASSERT (rel->r_offset + 9 <= input_section->size); 2656 BFD_ASSERT (bfd_get_8 (input_bfd, 2657 contents + rel->r_offset + 4) 2658 == 0xe8); 2659 BFD_ASSERT (rel + 1 < relend); 2660 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 2661 roff = rel->r_offset + 5; 2662 val = bfd_get_8 (input_bfd, 2663 contents + rel->r_offset - 1); 2664 if (type == 0x04) 2665 { 2666 /* leal foo(,%reg,1), %eax; call ___tls_get_addr 2667 Change it into: 2668 movl %gs:0, %eax; subl $foo@tpoff, %eax 2669 (6 byte form of subl). */ 2670 BFD_ASSERT (rel->r_offset >= 3); 2671 BFD_ASSERT (bfd_get_8 (input_bfd, 2672 contents + rel->r_offset - 3) 2673 == 0x8d); 2674 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); 2675 memcpy (contents + rel->r_offset - 3, 2676 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); 2677 } 2678 else 2679 { 2680 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); 2681 if (rel->r_offset + 10 <= input_section->size 2682 && bfd_get_8 (input_bfd, 2683 contents + rel->r_offset + 9) == 0x90) 2684 { 2685 /* leal foo(%reg), %eax; call ___tls_get_addr; nop 2686 Change it into: 2687 movl %gs:0, %eax; subl $foo@tpoff, %eax 2688 (6 byte form of subl). */ 2689 memcpy (contents + rel->r_offset - 2, 2690 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); 2691 roff = rel->r_offset + 6; 2692 } 2693 else 2694 { 2695 /* leal foo(%reg), %eax; call ___tls_get_addr 2696 Change it into: 2697 movl %gs:0, %eax; subl $foo@tpoff, %eax 2698 (5 byte form of subl). */ 2699 memcpy (contents + rel->r_offset - 2, 2700 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); 2701 } 2702 } 2703 bfd_put_32 (output_bfd, tpoff (info, relocation), 2704 contents + roff); 2705 /* Skip R_386_PLT32. */ 2706 rel++; 2707 continue; 2708 } 2709 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) 2710 { 2711 /* GDesc -> LE transition. 2712 It's originally something like: 2713 leal x@tlsdesc(%ebx), %eax 2714 2715 leal x@ntpoff, %eax 2716 2717 Registers other than %eax may be set up here. */ 2718 2719 unsigned int val, type; 2720 bfd_vma roff; 2721 2722 /* First, make sure it's a leal adding ebx to a 2723 32-bit offset into any register, although it's 2724 probably almost always going to be eax. */ 2725 roff = rel->r_offset; 2726 BFD_ASSERT (roff >= 2); 2727 type = bfd_get_8 (input_bfd, contents + roff - 2); 2728 BFD_ASSERT (type == 0x8d); 2729 val = bfd_get_8 (input_bfd, contents + roff - 1); 2730 BFD_ASSERT ((val & 0xc7) == 0x83); 2731 BFD_ASSERT (roff + 4 <= input_section->size); 2732 2733 /* Now modify the instruction as appropriate. */ 2734 /* aoliva FIXME: remove the above and xor the byte 2735 below with 0x86. */ 2736 bfd_put_8 (output_bfd, val ^ 0x86, 2737 contents + roff - 1); 2738 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2739 contents + roff); 2740 continue; 2741 } 2742 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) 2743 { 2744 /* GDesc -> LE transition. 2745 It's originally: 2746 call *(%eax) 2747 Turn it into: 2748 nop; nop */ 2749 2750 unsigned int val, type; 2751 bfd_vma roff; 2752 2753 /* First, make sure it's a call *(%eax). */ 2754 roff = rel->r_offset; 2755 BFD_ASSERT (roff + 2 <= input_section->size); 2756 type = bfd_get_8 (input_bfd, contents + roff); 2757 BFD_ASSERT (type == 0xff); 2758 val = bfd_get_8 (input_bfd, contents + roff + 1); 2759 BFD_ASSERT (val == 0x10); 2760 2761 /* Now modify the instruction as appropriate. Use 2762 xchg %ax,%ax instead of 2 nops. */ 2763 bfd_put_8 (output_bfd, 0x66, contents + roff); 2764 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 2765 continue; 2766 } 2767 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE) 2768 { 2769 unsigned int val, type; 2770 2771 /* IE->LE transition: 2772 Originally it can be one of: 2773 movl foo, %eax 2774 movl foo, %reg 2775 addl foo, %reg 2776 We change it into: 2777 movl $foo, %eax 2778 movl $foo, %reg 2779 addl $foo, %reg. */ 2780 BFD_ASSERT (rel->r_offset >= 1); 2781 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2782 BFD_ASSERT (rel->r_offset + 4 <= input_section->size); 2783 if (val == 0xa1) 2784 { 2785 /* movl foo, %eax. */ 2786 bfd_put_8 (output_bfd, 0xb8, 2787 contents + rel->r_offset - 1); 2788 } 2789 else 2790 { 2791 BFD_ASSERT (rel->r_offset >= 2); 2792 type = bfd_get_8 (input_bfd, 2793 contents + rel->r_offset - 2); 2794 switch (type) 2795 { 2796 case 0x8b: 2797 /* movl */ 2798 BFD_ASSERT ((val & 0xc7) == 0x05); 2799 bfd_put_8 (output_bfd, 0xc7, 2800 contents + rel->r_offset - 2); 2801 bfd_put_8 (output_bfd, 2802 0xc0 | ((val >> 3) & 7), 2803 contents + rel->r_offset - 1); 2804 break; 2805 case 0x03: 2806 /* addl */ 2807 BFD_ASSERT ((val & 0xc7) == 0x05); 2808 bfd_put_8 (output_bfd, 0x81, 2809 contents + rel->r_offset - 2); 2810 bfd_put_8 (output_bfd, 2811 0xc0 | ((val >> 3) & 7), 2812 contents + rel->r_offset - 1); 2813 break; 2814 default: 2815 BFD_FAIL (); 2816 break; 2817 } 2818 } 2819 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2820 contents + rel->r_offset); 2821 continue; 2822 } 2823 else 2824 { 2825 unsigned int val, type; 2826 2827 /* {IE_32,GOTIE}->LE transition: 2828 Originally it can be one of: 2829 subl foo(%reg1), %reg2 2830 movl foo(%reg1), %reg2 2831 addl foo(%reg1), %reg2 2832 We change it into: 2833 subl $foo, %reg2 2834 movl $foo, %reg2 (6 byte form) 2835 addl $foo, %reg2. */ 2836 BFD_ASSERT (rel->r_offset >= 2); 2837 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 2838 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2839 BFD_ASSERT (rel->r_offset + 4 <= input_section->size); 2840 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4); 2841 if (type == 0x8b) 2842 { 2843 /* movl */ 2844 bfd_put_8 (output_bfd, 0xc7, 2845 contents + rel->r_offset - 2); 2846 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 2847 contents + rel->r_offset - 1); 2848 } 2849 else if (type == 0x2b) 2850 { 2851 /* subl */ 2852 bfd_put_8 (output_bfd, 0x81, 2853 contents + rel->r_offset - 2); 2854 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), 2855 contents + rel->r_offset - 1); 2856 } 2857 else if (type == 0x03) 2858 { 2859 /* addl */ 2860 bfd_put_8 (output_bfd, 0x81, 2861 contents + rel->r_offset - 2); 2862 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 2863 contents + rel->r_offset - 1); 2864 } 2865 else 2866 BFD_FAIL (); 2867 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE) 2868 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2869 contents + rel->r_offset); 2870 else 2871 bfd_put_32 (output_bfd, tpoff (info, relocation), 2872 contents + rel->r_offset); 2873 continue; 2874 } 2875 } 2876 2877 if (htab->sgot == NULL) 2878 abort (); 2879 2880 if (h != NULL) 2881 { 2882 off = h->got.offset; 2883 offplt = elf_i386_hash_entry (h)->tlsdesc_got; 2884 } 2885 else 2886 { 2887 if (local_got_offsets == NULL) 2888 abort (); 2889 2890 off = local_got_offsets[r_symndx]; 2891 offplt = local_tlsdesc_gotents[r_symndx]; 2892 } 2893 2894 if ((off & 1) != 0) 2895 off &= ~1; 2896 else 2897 { 2898 Elf_Internal_Rela outrel; 2899 bfd_byte *loc; 2900 int dr_type, indx; 2901 asection *sreloc; 2902 2903 if (htab->srelgot == NULL) 2904 abort (); 2905 2906 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2907 2908 if (GOT_TLS_GDESC_P (tls_type)) 2909 { 2910 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC); 2911 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8 2912 <= htab->sgotplt->size); 2913 outrel.r_offset = (htab->sgotplt->output_section->vma 2914 + htab->sgotplt->output_offset 2915 + offplt 2916 + htab->sgotplt_jump_table_size); 2917 sreloc = htab->srelplt; 2918 loc = sreloc->contents; 2919 loc += (htab->next_tls_desc_index++ 2920 * sizeof (Elf32_External_Rel)); 2921 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 2922 <= sreloc->contents + sreloc->size); 2923 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2924 if (indx == 0) 2925 { 2926 BFD_ASSERT (! unresolved_reloc); 2927 bfd_put_32 (output_bfd, 2928 relocation - dtpoff_base (info), 2929 htab->sgotplt->contents + offplt 2930 + htab->sgotplt_jump_table_size + 4); 2931 } 2932 else 2933 { 2934 bfd_put_32 (output_bfd, 0, 2935 htab->sgotplt->contents + offplt 2936 + htab->sgotplt_jump_table_size + 4); 2937 } 2938 } 2939 2940 sreloc = htab->srelgot; 2941 2942 outrel.r_offset = (htab->sgot->output_section->vma 2943 + htab->sgot->output_offset + off); 2944 2945 if (GOT_TLS_GD_P (tls_type)) 2946 dr_type = R_386_TLS_DTPMOD32; 2947 else if (GOT_TLS_GDESC_P (tls_type)) 2948 goto dr_done; 2949 else if (tls_type == GOT_TLS_IE_POS) 2950 dr_type = R_386_TLS_TPOFF; 2951 else 2952 dr_type = R_386_TLS_TPOFF32; 2953 2954 if (dr_type == R_386_TLS_TPOFF && indx == 0) 2955 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 2956 htab->sgot->contents + off); 2957 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) 2958 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation, 2959 htab->sgot->contents + off); 2960 else if (dr_type != R_386_TLS_DESC) 2961 bfd_put_32 (output_bfd, 0, 2962 htab->sgot->contents + off); 2963 outrel.r_info = ELF32_R_INFO (indx, dr_type); 2964 2965 loc = sreloc->contents; 2966 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 2967 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 2968 <= sreloc->contents + sreloc->size); 2969 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2970 2971 if (GOT_TLS_GD_P (tls_type)) 2972 { 2973 if (indx == 0) 2974 { 2975 BFD_ASSERT (! unresolved_reloc); 2976 bfd_put_32 (output_bfd, 2977 relocation - dtpoff_base (info), 2978 htab->sgot->contents + off + 4); 2979 } 2980 else 2981 { 2982 bfd_put_32 (output_bfd, 0, 2983 htab->sgot->contents + off + 4); 2984 outrel.r_info = ELF32_R_INFO (indx, 2985 R_386_TLS_DTPOFF32); 2986 outrel.r_offset += 4; 2987 sreloc->reloc_count++; 2988 loc += sizeof (Elf32_External_Rel); 2989 BFD_ASSERT (loc + sizeof (Elf32_External_Rel) 2990 <= sreloc->contents + sreloc->size); 2991 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2992 } 2993 } 2994 else if (tls_type == GOT_TLS_IE_BOTH) 2995 { 2996 bfd_put_32 (output_bfd, 2997 indx == 0 ? relocation - dtpoff_base (info) : 0, 2998 htab->sgot->contents + off + 4); 2999 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 3000 outrel.r_offset += 4; 3001 sreloc->reloc_count++; 3002 loc += sizeof (Elf32_External_Rel); 3003 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3004 } 3005 3006 dr_done: 3007 if (h != NULL) 3008 h->got.offset |= 1; 3009 else 3010 local_got_offsets[r_symndx] |= 1; 3011 } 3012 3013 if (off >= (bfd_vma) -2 3014 && ! GOT_TLS_GDESC_P (tls_type)) 3015 abort (); 3016 if (r_type == R_386_TLS_GOTDESC 3017 || r_type == R_386_TLS_DESC_CALL) 3018 { 3019 relocation = htab->sgotplt_jump_table_size + offplt; 3020 unresolved_reloc = FALSE; 3021 } 3022 else if (r_type == ELF32_R_TYPE (rel->r_info)) 3023 { 3024 bfd_vma g_o_t = htab->sgotplt->output_section->vma 3025 + htab->sgotplt->output_offset; 3026 relocation = htab->sgot->output_section->vma 3027 + htab->sgot->output_offset + off - g_o_t; 3028 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) 3029 && tls_type == GOT_TLS_IE_BOTH) 3030 relocation += 4; 3031 if (r_type == R_386_TLS_IE) 3032 relocation += g_o_t; 3033 unresolved_reloc = FALSE; 3034 } 3035 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) 3036 { 3037 unsigned int val, type; 3038 bfd_vma roff; 3039 3040 /* GD->IE transition. */ 3041 BFD_ASSERT (rel->r_offset >= 2); 3042 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 3043 BFD_ASSERT (type == 0x8d || type == 0x04); 3044 BFD_ASSERT (rel->r_offset + 9 <= input_section->size); 3045 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) 3046 == 0xe8); 3047 BFD_ASSERT (rel + 1 < relend); 3048 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 3049 roff = rel->r_offset - 3; 3050 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 3051 if (type == 0x04) 3052 { 3053 /* leal foo(,%reg,1), %eax; call ___tls_get_addr 3054 Change it into: 3055 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ 3056 BFD_ASSERT (rel->r_offset >= 3); 3057 BFD_ASSERT (bfd_get_8 (input_bfd, 3058 contents + rel->r_offset - 3) 3059 == 0x8d); 3060 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); 3061 val >>= 3; 3062 } 3063 else 3064 { 3065 /* leal foo(%reg), %eax; call ___tls_get_addr; nop 3066 Change it into: 3067 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ 3068 BFD_ASSERT (rel->r_offset + 10 <= input_section->size); 3069 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); 3070 BFD_ASSERT (bfd_get_8 (input_bfd, 3071 contents + rel->r_offset + 9) 3072 == 0x90); 3073 roff = rel->r_offset - 2; 3074 } 3075 memcpy (contents + roff, 3076 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); 3077 contents[roff + 7] = 0x80 | (val & 7); 3078 /* If foo is used only with foo@gotntpoff(%reg) and 3079 foo@indntpoff, but not with foo@gottpoff(%reg), change 3080 subl $foo@gottpoff(%reg), %eax 3081 into: 3082 addl $foo@gotntpoff(%reg), %eax. */ 3083 if (tls_type == GOT_TLS_IE_POS) 3084 contents[roff + 6] = 0x03; 3085 bfd_put_32 (output_bfd, 3086 htab->sgot->output_section->vma 3087 + htab->sgot->output_offset + off 3088 - htab->sgotplt->output_section->vma 3089 - htab->sgotplt->output_offset, 3090 contents + roff + 8); 3091 /* Skip R_386_PLT32. */ 3092 rel++; 3093 continue; 3094 } 3095 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) 3096 { 3097 /* GDesc -> IE transition. 3098 It's originally something like: 3099 leal x@tlsdesc(%ebx), %eax 3100 3101 Change it to: 3102 movl x@gotntpoff(%ebx), %eax # before nop; nop 3103 or: 3104 movl x@gottpoff(%ebx), %eax # before negl %eax 3105 3106 Registers other than %eax may be set up here. */ 3107 3108 unsigned int val, type; 3109 bfd_vma roff; 3110 3111 /* First, make sure it's a leal adding ebx to a 32-bit 3112 offset into any register, although it's probably 3113 almost always going to be eax. */ 3114 roff = rel->r_offset; 3115 BFD_ASSERT (roff >= 2); 3116 type = bfd_get_8 (input_bfd, contents + roff - 2); 3117 BFD_ASSERT (type == 0x8d); 3118 val = bfd_get_8 (input_bfd, contents + roff - 1); 3119 BFD_ASSERT ((val & 0xc7) == 0x83); 3120 BFD_ASSERT (roff + 4 <= input_section->size); 3121 3122 /* Now modify the instruction as appropriate. */ 3123 /* To turn a leal into a movl in the form we use it, it 3124 suffices to change the first byte from 0x8d to 0x8b. 3125 aoliva FIXME: should we decide to keep the leal, all 3126 we have to do is remove the statement below, and 3127 adjust the relaxation of R_386_TLS_DESC_CALL. */ 3128 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); 3129 3130 if (tls_type == GOT_TLS_IE_BOTH) 3131 off += 4; 3132 3133 bfd_put_32 (output_bfd, 3134 htab->sgot->output_section->vma 3135 + htab->sgot->output_offset + off 3136 - htab->sgotplt->output_section->vma 3137 - htab->sgotplt->output_offset, 3138 contents + roff); 3139 continue; 3140 } 3141 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) 3142 { 3143 /* GDesc -> IE transition. 3144 It's originally: 3145 call *(%eax) 3146 3147 Change it to: 3148 nop; nop 3149 or 3150 negl %eax 3151 depending on how we transformed the TLS_GOTDESC above. 3152 */ 3153 3154 unsigned int val, type; 3155 bfd_vma roff; 3156 3157 /* First, make sure it's a call *(%eax). */ 3158 roff = rel->r_offset; 3159 BFD_ASSERT (roff + 2 <= input_section->size); 3160 type = bfd_get_8 (input_bfd, contents + roff); 3161 BFD_ASSERT (type == 0xff); 3162 val = bfd_get_8 (input_bfd, contents + roff + 1); 3163 BFD_ASSERT (val == 0x10); 3164 3165 /* Now modify the instruction as appropriate. */ 3166 if (tls_type != GOT_TLS_IE_NEG) 3167 { 3168 /* xchg %ax,%ax */ 3169 bfd_put_8 (output_bfd, 0x66, contents + roff); 3170 bfd_put_8 (output_bfd, 0x90, contents + roff + 1); 3171 } 3172 else 3173 { 3174 /* negl %eax */ 3175 bfd_put_8 (output_bfd, 0xf7, contents + roff); 3176 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1); 3177 } 3178 3179 continue; 3180 } 3181 else 3182 BFD_ASSERT (FALSE); 3183 break; 3184 3185 case R_386_TLS_LDM: 3186 if (! info->shared) 3187 { 3188 unsigned int val; 3189 3190 /* LD->LE transition: 3191 Ensure it is: 3192 leal foo(%reg), %eax; call ___tls_get_addr. 3193 We change it into: 3194 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */ 3195 BFD_ASSERT (rel->r_offset >= 2); 3196 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2) 3197 == 0x8d); 3198 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 3199 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); 3200 BFD_ASSERT (rel->r_offset + 9 <= input_section->size); 3201 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) 3202 == 0xe8); 3203 BFD_ASSERT (rel + 1 < relend); 3204 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 3205 memcpy (contents + rel->r_offset - 2, 3206 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); 3207 /* Skip R_386_PLT32. */ 3208 rel++; 3209 continue; 3210 } 3211 3212 if (htab->sgot == NULL) 3213 abort (); 3214 3215 off = htab->tls_ldm_got.offset; 3216 if (off & 1) 3217 off &= ~1; 3218 else 3219 { 3220 Elf_Internal_Rela outrel; 3221 bfd_byte *loc; 3222 3223 if (htab->srelgot == NULL) 3224 abort (); 3225 3226 outrel.r_offset = (htab->sgot->output_section->vma 3227 + htab->sgot->output_offset + off); 3228 3229 bfd_put_32 (output_bfd, 0, 3230 htab->sgot->contents + off); 3231 bfd_put_32 (output_bfd, 0, 3232 htab->sgot->contents + off + 4); 3233 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); 3234 loc = htab->srelgot->contents; 3235 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); 3236 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3237 htab->tls_ldm_got.offset |= 1; 3238 } 3239 relocation = htab->sgot->output_section->vma 3240 + htab->sgot->output_offset + off 3241 - htab->sgotplt->output_section->vma 3242 - htab->sgotplt->output_offset; 3243 unresolved_reloc = FALSE; 3244 break; 3245 3246 case R_386_TLS_LDO_32: 3247 if (info->shared || (input_section->flags & SEC_CODE) == 0) 3248 relocation -= dtpoff_base (info); 3249 else 3250 /* When converting LDO to LE, we must negate. */ 3251 relocation = -tpoff (info, relocation); 3252 break; 3253 3254 case R_386_TLS_LE_32: 3255 case R_386_TLS_LE: 3256 if (info->shared) 3257 { 3258 Elf_Internal_Rela outrel; 3259 asection *sreloc; 3260 bfd_byte *loc; 3261 int indx; 3262 3263 outrel.r_offset = rel->r_offset 3264 + input_section->output_section->vma 3265 + input_section->output_offset; 3266 if (h != NULL && h->dynindx != -1) 3267 indx = h->dynindx; 3268 else 3269 indx = 0; 3270 if (r_type == R_386_TLS_LE_32) 3271 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); 3272 else 3273 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 3274 sreloc = elf_section_data (input_section)->sreloc; 3275 if (sreloc == NULL) 3276 abort (); 3277 loc = sreloc->contents; 3278 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 3279 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 3280 if (indx) 3281 continue; 3282 else if (r_type == R_386_TLS_LE_32) 3283 relocation = dtpoff_base (info) - relocation; 3284 else 3285 relocation -= dtpoff_base (info); 3286 } 3287 else if (r_type == R_386_TLS_LE_32) 3288 relocation = tpoff (info, relocation); 3289 else 3290 relocation = -tpoff (info, relocation); 3291 break; 3292 3293 default: 3294 break; 3295 } 3296 3297 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 3298 because such sections are not SEC_ALLOC and thus ld.so will 3299 not process them. */ 3300 if (unresolved_reloc 3301 && !((input_section->flags & SEC_DEBUGGING) != 0 3302 && h->def_dynamic)) 3303 { 3304 (*_bfd_error_handler) 3305 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 3306 input_bfd, 3307 input_section, 3308 (long) rel->r_offset, 3309 howto->name, 3310 h->root.root.string); 3311 return FALSE; 3312 } 3313 3314 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 3315 contents, rel->r_offset, 3316 relocation, 0); 3317 3318 if (r != bfd_reloc_ok) 3319 { 3320 const char *name; 3321 3322 if (h != NULL) 3323 name = h->root.root.string; 3324 else 3325 { 3326 name = bfd_elf_string_from_elf_section (input_bfd, 3327 symtab_hdr->sh_link, 3328 sym->st_name); 3329 if (name == NULL) 3330 return FALSE; 3331 if (*name == '\0') 3332 name = bfd_section_name (input_bfd, sec); 3333 } 3334 3335 if (r == bfd_reloc_overflow) 3336 { 3337 if (! ((*info->callbacks->reloc_overflow) 3338 (info, (h ? &h->root : NULL), name, howto->name, 3339 (bfd_vma) 0, input_bfd, input_section, 3340 rel->r_offset))) 3341 return FALSE; 3342 } 3343 else 3344 { 3345 (*_bfd_error_handler) 3346 (_("%B(%A+0x%lx): reloc against `%s': error %d"), 3347 input_bfd, input_section, 3348 (long) rel->r_offset, name, (int) r); 3349 return FALSE; 3350 } 3351 } 3352 } 3353 3354 return TRUE; 3355} 3356 3357/* Finish up dynamic symbol handling. We set the contents of various 3358 dynamic sections here. */ 3359 3360static bfd_boolean 3361elf_i386_finish_dynamic_symbol (bfd *output_bfd, 3362 struct bfd_link_info *info, 3363 struct elf_link_hash_entry *h, 3364 Elf_Internal_Sym *sym) 3365{ 3366 struct elf_i386_link_hash_table *htab; 3367 3368 htab = elf_i386_hash_table (info); 3369 3370 if (h->plt.offset != (bfd_vma) -1) 3371 { 3372 bfd_vma plt_index; 3373 bfd_vma got_offset; 3374 Elf_Internal_Rela rel; 3375 bfd_byte *loc; 3376 3377 /* This symbol has an entry in the procedure linkage table. Set 3378 it up. */ 3379 3380 if (h->dynindx == -1 3381 || htab->splt == NULL 3382 || htab->sgotplt == NULL 3383 || htab->srelplt == NULL) 3384 abort (); 3385 3386 /* Get the index in the procedure linkage table which 3387 corresponds to this symbol. This is the index of this symbol 3388 in all the symbols for which we are making plt entries. The 3389 first entry in the procedure linkage table is reserved. */ 3390 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 3391 3392 /* Get the offset into the .got table of the entry that 3393 corresponds to this function. Each .got entry is 4 bytes. 3394 The first three are reserved. */ 3395 got_offset = (plt_index + 3) * 4; 3396 3397 /* Fill in the entry in the procedure linkage table. */ 3398 if (! info->shared) 3399 { 3400 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry, 3401 PLT_ENTRY_SIZE); 3402 bfd_put_32 (output_bfd, 3403 (htab->sgotplt->output_section->vma 3404 + htab->sgotplt->output_offset 3405 + got_offset), 3406 htab->splt->contents + h->plt.offset + 2); 3407 3408 if (htab->is_vxworks) 3409 { 3410 int s, k, reloc_index; 3411 3412 /* Create the R_386_32 relocation referencing the GOT 3413 for this PLT entry. */ 3414 3415 /* S: Current slot number (zero-based). */ 3416 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE; 3417 /* K: Number of relocations for PLTResolve. */ 3418 if (info->shared) 3419 k = PLTRESOLVE_RELOCS_SHLIB; 3420 else 3421 k = PLTRESOLVE_RELOCS; 3422 /* Skip the PLTresolve relocations, and the relocations for 3423 the other PLT slots. */ 3424 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS; 3425 loc = (htab->srelplt2->contents + reloc_index 3426 * sizeof (Elf32_External_Rel)); 3427 3428 rel.r_offset = (htab->splt->output_section->vma 3429 + htab->splt->output_offset 3430 + h->plt.offset + 2), 3431 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 3432 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3433 3434 /* Create the R_386_32 relocation referencing the beginning of 3435 the PLT for this GOT entry. */ 3436 rel.r_offset = (htab->sgotplt->output_section->vma 3437 + htab->sgotplt->output_offset 3438 + got_offset); 3439 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); 3440 bfd_elf32_swap_reloc_out (output_bfd, &rel, 3441 loc + sizeof (Elf32_External_Rel)); 3442 } 3443 } 3444 else 3445 { 3446 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry, 3447 PLT_ENTRY_SIZE); 3448 bfd_put_32 (output_bfd, got_offset, 3449 htab->splt->contents + h->plt.offset + 2); 3450 } 3451 3452 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), 3453 htab->splt->contents + h->plt.offset + 7); 3454 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), 3455 htab->splt->contents + h->plt.offset + 12); 3456 3457 /* Fill in the entry in the global offset table. */ 3458 bfd_put_32 (output_bfd, 3459 (htab->splt->output_section->vma 3460 + htab->splt->output_offset 3461 + h->plt.offset 3462 + 6), 3463 htab->sgotplt->contents + got_offset); 3464 3465 /* Fill in the entry in the .rel.plt section. */ 3466 rel.r_offset = (htab->sgotplt->output_section->vma 3467 + htab->sgotplt->output_offset 3468 + got_offset); 3469 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); 3470 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel); 3471 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3472 3473 if (!h->def_regular) 3474 { 3475 /* Mark the symbol as undefined, rather than as defined in 3476 the .plt section. Leave the value if there were any 3477 relocations where pointer equality matters (this is a clue 3478 for the dynamic linker, to make function pointer 3479 comparisons work between an application and shared 3480 library), otherwise set it to zero. If a function is only 3481 called from a binary, there is no need to slow down 3482 shared libraries because of that. */ 3483 sym->st_shndx = SHN_UNDEF; 3484 if (!h->pointer_equality_needed) 3485 sym->st_value = 0; 3486 } 3487 } 3488 3489 if (h->got.offset != (bfd_vma) -1 3490 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type) 3491 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0) 3492 { 3493 Elf_Internal_Rela rel; 3494 bfd_byte *loc; 3495 3496 /* This symbol has an entry in the global offset table. Set it 3497 up. */ 3498 3499 if (htab->sgot == NULL || htab->srelgot == NULL) 3500 abort (); 3501 3502 rel.r_offset = (htab->sgot->output_section->vma 3503 + htab->sgot->output_offset 3504 + (h->got.offset & ~(bfd_vma) 1)); 3505 3506 /* If this is a static link, or it is a -Bsymbolic link and the 3507 symbol is defined locally or was forced to be local because 3508 of a version file, we just want to emit a RELATIVE reloc. 3509 The entry in the global offset table will already have been 3510 initialized in the relocate_section function. */ 3511 if (info->shared 3512 && SYMBOL_REFERENCES_LOCAL (info, h)) 3513 { 3514 BFD_ASSERT((h->got.offset & 1) != 0); 3515 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 3516 } 3517 else 3518 { 3519 BFD_ASSERT((h->got.offset & 1) == 0); 3520 bfd_put_32 (output_bfd, (bfd_vma) 0, 3521 htab->sgot->contents + h->got.offset); 3522 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); 3523 } 3524 3525 loc = htab->srelgot->contents; 3526 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); 3527 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3528 } 3529 3530 if (h->needs_copy) 3531 { 3532 Elf_Internal_Rela rel; 3533 bfd_byte *loc; 3534 3535 /* This symbol needs a copy reloc. Set it up. */ 3536 3537 if (h->dynindx == -1 3538 || (h->root.type != bfd_link_hash_defined 3539 && h->root.type != bfd_link_hash_defweak) 3540 || htab->srelbss == NULL) 3541 abort (); 3542 3543 rel.r_offset = (h->root.u.def.value 3544 + h->root.u.def.section->output_section->vma 3545 + h->root.u.def.section->output_offset); 3546 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); 3547 loc = htab->srelbss->contents; 3548 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel); 3549 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3550 } 3551 3552 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. 3553 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it 3554 is relative to the ".got" section. */ 3555 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 3556 || (!htab->is_vxworks && h == htab->elf.hgot)) 3557 sym->st_shndx = SHN_ABS; 3558 3559 return TRUE; 3560} 3561 3562/* Used to decide how to sort relocs in an optimal manner for the 3563 dynamic linker, before writing them out. */ 3564 3565static enum elf_reloc_type_class 3566elf_i386_reloc_type_class (const Elf_Internal_Rela *rela) 3567{ 3568 switch (ELF32_R_TYPE (rela->r_info)) 3569 { 3570 case R_386_RELATIVE: 3571 return reloc_class_relative; 3572 case R_386_JUMP_SLOT: 3573 return reloc_class_plt; 3574 case R_386_COPY: 3575 return reloc_class_copy; 3576 default: 3577 return reloc_class_normal; 3578 } 3579} 3580 3581/* Finish up the dynamic sections. */ 3582 3583static bfd_boolean 3584elf_i386_finish_dynamic_sections (bfd *output_bfd, 3585 struct bfd_link_info *info) 3586{ 3587 struct elf_i386_link_hash_table *htab; 3588 bfd *dynobj; 3589 asection *sdyn; 3590 3591 htab = elf_i386_hash_table (info); 3592 dynobj = htab->elf.dynobj; 3593 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 3594 3595 if (htab->elf.dynamic_sections_created) 3596 { 3597 Elf32_External_Dyn *dyncon, *dynconend; 3598 3599 if (sdyn == NULL || htab->sgot == NULL) 3600 abort (); 3601 3602 dyncon = (Elf32_External_Dyn *) sdyn->contents; 3603 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); 3604 for (; dyncon < dynconend; dyncon++) 3605 { 3606 Elf_Internal_Dyn dyn; 3607 asection *s; 3608 3609 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 3610 3611 switch (dyn.d_tag) 3612 { 3613 default: 3614 continue; 3615 3616 case DT_PLTGOT: 3617 s = htab->sgotplt; 3618 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3619 break; 3620 3621 case DT_JMPREL: 3622 s = htab->srelplt; 3623 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3624 break; 3625 3626 case DT_PLTRELSZ: 3627 s = htab->srelplt; 3628 dyn.d_un.d_val = s->size; 3629 break; 3630 3631 case DT_RELSZ: 3632 /* My reading of the SVR4 ABI indicates that the 3633 procedure linkage table relocs (DT_JMPREL) should be 3634 included in the overall relocs (DT_REL). This is 3635 what Solaris does. However, UnixWare can not handle 3636 that case. Therefore, we override the DT_RELSZ entry 3637 here to make it not include the JMPREL relocs. */ 3638 s = htab->srelplt; 3639 if (s == NULL) 3640 continue; 3641 dyn.d_un.d_val -= s->size; 3642 break; 3643 3644 case DT_REL: 3645 /* We may not be using the standard ELF linker script. 3646 If .rel.plt is the first .rel section, we adjust 3647 DT_REL to not include it. */ 3648 s = htab->srelplt; 3649 if (s == NULL) 3650 continue; 3651 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) 3652 continue; 3653 dyn.d_un.d_ptr += s->size; 3654 break; 3655 } 3656 3657 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3658 } 3659 3660 /* Fill in the first entry in the procedure linkage table. */ 3661 if (htab->splt && htab->splt->size > 0) 3662 { 3663 if (info->shared) 3664 { 3665 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry, 3666 sizeof (elf_i386_pic_plt0_entry)); 3667 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry), 3668 htab->plt0_pad_byte, 3669 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry)); 3670 } 3671 else 3672 { 3673 memcpy (htab->splt->contents, elf_i386_plt0_entry, 3674 sizeof(elf_i386_plt0_entry)); 3675 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry), 3676 htab->plt0_pad_byte, 3677 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry)); 3678 bfd_put_32 (output_bfd, 3679 (htab->sgotplt->output_section->vma 3680 + htab->sgotplt->output_offset 3681 + 4), 3682 htab->splt->contents + 2); 3683 bfd_put_32 (output_bfd, 3684 (htab->sgotplt->output_section->vma 3685 + htab->sgotplt->output_offset 3686 + 8), 3687 htab->splt->contents + 8); 3688 3689 if (htab->is_vxworks) 3690 { 3691 Elf_Internal_Rela rel; 3692 3693 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4. 3694 On IA32 we use REL relocations so the addend goes in 3695 the PLT directly. */ 3696 rel.r_offset = (htab->splt->output_section->vma 3697 + htab->splt->output_offset 3698 + 2); 3699 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 3700 bfd_elf32_swap_reloc_out (output_bfd, &rel, 3701 htab->srelplt2->contents); 3702 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ 3703 rel.r_offset = (htab->splt->output_section->vma 3704 + htab->splt->output_offset 3705 + 8); 3706 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 3707 bfd_elf32_swap_reloc_out (output_bfd, &rel, 3708 htab->srelplt2->contents + 3709 sizeof (Elf32_External_Rel)); 3710 } 3711 } 3712 3713 /* UnixWare sets the entsize of .plt to 4, although that doesn't 3714 really seem like the right value. */ 3715 elf_section_data (htab->splt->output_section) 3716 ->this_hdr.sh_entsize = 4; 3717 3718 /* Correct the .rel.plt.unloaded relocations. */ 3719 if (htab->is_vxworks && !info->shared) 3720 { 3721 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1; 3722 unsigned char *p; 3723 3724 p = htab->srelplt2->contents; 3725 if (info->shared) 3726 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel); 3727 else 3728 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel); 3729 3730 for (; num_plts; num_plts--) 3731 { 3732 Elf_Internal_Rela rel; 3733 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 3734 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); 3735 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 3736 p += sizeof (Elf32_External_Rel); 3737 3738 bfd_elf32_swap_reloc_in (output_bfd, p, &rel); 3739 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); 3740 bfd_elf32_swap_reloc_out (output_bfd, &rel, p); 3741 p += sizeof (Elf32_External_Rel); 3742 } 3743 } 3744 } 3745 } 3746 3747 if (htab->sgotplt) 3748 { 3749 /* Fill in the first three entries in the global offset table. */ 3750 if (htab->sgotplt->size > 0) 3751 { 3752 bfd_put_32 (output_bfd, 3753 (sdyn == NULL ? 0 3754 : sdyn->output_section->vma + sdyn->output_offset), 3755 htab->sgotplt->contents); 3756 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4); 3757 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8); 3758 } 3759 3760 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4; 3761 } 3762 3763 if (htab->sgot && htab->sgot->size > 0) 3764 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4; 3765 3766 return TRUE; 3767} 3768 3769/* Return address for Ith PLT stub in section PLT, for relocation REL 3770 or (bfd_vma) -1 if it should not be included. */ 3771 3772static bfd_vma 3773elf_i386_plt_sym_val (bfd_vma i, const asection *plt, 3774 const arelent *rel ATTRIBUTE_UNUSED) 3775{ 3776 return plt->vma + (i + 1) * PLT_ENTRY_SIZE; 3777} 3778 3779/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ 3780 3781static bfd_boolean 3782elf_i386_hash_symbol (struct elf_link_hash_entry *h) 3783{ 3784 if (h->plt.offset != (bfd_vma) -1 3785 && !h->def_regular 3786 && !h->pointer_equality_needed) 3787 return FALSE; 3788 3789 return _bfd_elf_hash_symbol (h); 3790} 3791 3792#define TARGET_LITTLE_SYM bfd_elf32_i386_vec 3793#define TARGET_LITTLE_NAME "elf32-i386" 3794#define ELF_ARCH bfd_arch_i386 3795#define ELF_MACHINE_CODE EM_386 3796#define ELF_MAXPAGESIZE 0x1000 3797 3798#define elf_backend_can_gc_sections 1 3799#define elf_backend_can_refcount 1 3800#define elf_backend_want_got_plt 1 3801#define elf_backend_plt_readonly 1 3802#define elf_backend_want_plt_sym 0 3803#define elf_backend_got_header_size 12 3804 3805/* Support RELA for objdump of prelink objects. */ 3806#define elf_info_to_howto elf_i386_info_to_howto_rel 3807#define elf_info_to_howto_rel elf_i386_info_to_howto_rel 3808 3809#define bfd_elf32_mkobject elf_i386_mkobject 3810 3811#define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name 3812#define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create 3813#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup 3814#define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup 3815 3816#define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol 3817#define elf_backend_relocs_compatible _bfd_elf_relocs_compatible 3818#define elf_backend_check_relocs elf_i386_check_relocs 3819#define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol 3820#define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections 3821#define elf_backend_fake_sections elf_i386_fake_sections 3822#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections 3823#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol 3824#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook 3825#define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook 3826#define elf_backend_grok_prstatus elf_i386_grok_prstatus 3827#define elf_backend_grok_psinfo elf_i386_grok_psinfo 3828#define elf_backend_reloc_type_class elf_i386_reloc_type_class 3829#define elf_backend_relocate_section elf_i386_relocate_section 3830#define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections 3831#define elf_backend_always_size_sections elf_i386_always_size_sections 3832#define elf_backend_omit_section_dynsym \ 3833 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) 3834#define elf_backend_plt_sym_val elf_i386_plt_sym_val 3835#define elf_backend_hash_symbol elf_i386_hash_symbol 3836 3837#include "elf32-target.h" 3838 3839/* FreeBSD support. */ 3840 3841#undef TARGET_LITTLE_SYM 3842#define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec 3843#undef TARGET_LITTLE_NAME 3844#define TARGET_LITTLE_NAME "elf32-i386-freebsd" 3845#undef ELF_OSABI 3846#define ELF_OSABI ELFOSABI_FREEBSD 3847 3848/* The kernel recognizes executables as valid only if they carry a 3849 "FreeBSD" label in the ELF header. So we put this label on all 3850 executables and (for simplicity) also all other object files. */ 3851 3852static void 3853elf_i386_post_process_headers (bfd *abfd, 3854 struct bfd_link_info *info ATTRIBUTE_UNUSED) 3855{ 3856 Elf_Internal_Ehdr *i_ehdrp; 3857 3858 i_ehdrp = elf_elfheader (abfd); 3859 3860 /* Put an ABI label supported by FreeBSD >= 4.1. */ 3861 i_ehdrp->e_ident[EI_OSABI] = get_elf_backend_data (abfd)->elf_osabi; 3862#ifdef OLD_FREEBSD_ABI_LABEL 3863 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ 3864 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); 3865#endif 3866} 3867 3868#undef elf_backend_post_process_headers 3869#define elf_backend_post_process_headers elf_i386_post_process_headers 3870#undef elf32_bed 3871#define elf32_bed elf32_i386_fbsd_bed 3872 3873#include "elf32-target.h" 3874 3875/* VxWorks support. */ 3876 3877#undef TARGET_LITTLE_SYM 3878#define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec 3879#undef TARGET_LITTLE_NAME 3880#define TARGET_LITTLE_NAME "elf32-i386-vxworks" 3881#undef ELF_OSABI 3882 3883/* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */ 3884 3885static struct bfd_link_hash_table * 3886elf_i386_vxworks_link_hash_table_create (bfd *abfd) 3887{ 3888 struct bfd_link_hash_table *ret; 3889 struct elf_i386_link_hash_table *htab; 3890 3891 ret = elf_i386_link_hash_table_create (abfd); 3892 if (ret) 3893 { 3894 htab = (struct elf_i386_link_hash_table *) ret; 3895 htab->is_vxworks = 1; 3896 htab->plt0_pad_byte = 0x90; 3897 } 3898 3899 return ret; 3900} 3901 3902 3903#undef elf_backend_relocs_compatible 3904#undef elf_backend_post_process_headers 3905#undef bfd_elf32_bfd_link_hash_table_create 3906#define bfd_elf32_bfd_link_hash_table_create \ 3907 elf_i386_vxworks_link_hash_table_create 3908#undef elf_backend_add_symbol_hook 3909#define elf_backend_add_symbol_hook \ 3910 elf_vxworks_add_symbol_hook 3911#undef elf_backend_link_output_symbol_hook 3912#define elf_backend_link_output_symbol_hook \ 3913 elf_vxworks_link_output_symbol_hook 3914#undef elf_backend_emit_relocs 3915#define elf_backend_emit_relocs elf_vxworks_emit_relocs 3916#undef elf_backend_final_write_processing 3917#define elf_backend_final_write_processing \ 3918 elf_vxworks_final_write_processing 3919 3920/* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so 3921 define it. */ 3922#undef elf_backend_want_plt_sym 3923#define elf_backend_want_plt_sym 1 3924 3925#undef elf32_bed 3926#define elf32_bed elf32_i386_vxworks_bed 3927 3928#include "elf32-target.h" 3929