elf32-i386.c revision 130570
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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 20 21#include "bfd.h" 22#include "sysdep.h" 23#include "bfdlink.h" 24#include "libbfd.h" 25#include "elf-bfd.h" 26 27/* 386 uses REL relocations instead of RELA. */ 28#define USE_REL 1 29 30#include "elf/i386.h" 31 32static reloc_howto_type elf_howto_table[]= 33{ 34 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield, 35 bfd_elf_generic_reloc, "R_386_NONE", 36 TRUE, 0x00000000, 0x00000000, FALSE), 37 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 38 bfd_elf_generic_reloc, "R_386_32", 39 TRUE, 0xffffffff, 0xffffffff, FALSE), 40 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 41 bfd_elf_generic_reloc, "R_386_PC32", 42 TRUE, 0xffffffff, 0xffffffff, TRUE), 43 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 44 bfd_elf_generic_reloc, "R_386_GOT32", 45 TRUE, 0xffffffff, 0xffffffff, FALSE), 46 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 47 bfd_elf_generic_reloc, "R_386_PLT32", 48 TRUE, 0xffffffff, 0xffffffff, TRUE), 49 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 50 bfd_elf_generic_reloc, "R_386_COPY", 51 TRUE, 0xffffffff, 0xffffffff, FALSE), 52 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 53 bfd_elf_generic_reloc, "R_386_GLOB_DAT", 54 TRUE, 0xffffffff, 0xffffffff, FALSE), 55 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 56 bfd_elf_generic_reloc, "R_386_JUMP_SLOT", 57 TRUE, 0xffffffff, 0xffffffff, FALSE), 58 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 59 bfd_elf_generic_reloc, "R_386_RELATIVE", 60 TRUE, 0xffffffff, 0xffffffff, FALSE), 61 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 62 bfd_elf_generic_reloc, "R_386_GOTOFF", 63 TRUE, 0xffffffff, 0xffffffff, FALSE), 64 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, 65 bfd_elf_generic_reloc, "R_386_GOTPC", 66 TRUE, 0xffffffff, 0xffffffff, TRUE), 67 68 /* We have a gap in the reloc numbers here. 69 R_386_standard counts the number up to this point, and 70 R_386_ext_offset is the value to subtract from a reloc type of 71 R_386_16 thru R_386_PC8 to form an index into this table. */ 72#define R_386_standard (R_386_GOTPC + 1) 73#define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard) 74 75 /* These relocs are a GNU extension. */ 76 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 77 bfd_elf_generic_reloc, "R_386_TLS_TPOFF", 78 TRUE, 0xffffffff, 0xffffffff, FALSE), 79 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 80 bfd_elf_generic_reloc, "R_386_TLS_IE", 81 TRUE, 0xffffffff, 0xffffffff, FALSE), 82 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 83 bfd_elf_generic_reloc, "R_386_TLS_GOTIE", 84 TRUE, 0xffffffff, 0xffffffff, FALSE), 85 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 86 bfd_elf_generic_reloc, "R_386_TLS_LE", 87 TRUE, 0xffffffff, 0xffffffff, FALSE), 88 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 89 bfd_elf_generic_reloc, "R_386_TLS_GD", 90 TRUE, 0xffffffff, 0xffffffff, FALSE), 91 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 92 bfd_elf_generic_reloc, "R_386_TLS_LDM", 93 TRUE, 0xffffffff, 0xffffffff, FALSE), 94 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 95 bfd_elf_generic_reloc, "R_386_16", 96 TRUE, 0xffff, 0xffff, FALSE), 97 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, 98 bfd_elf_generic_reloc, "R_386_PC16", 99 TRUE, 0xffff, 0xffff, TRUE), 100 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 101 bfd_elf_generic_reloc, "R_386_8", 102 TRUE, 0xff, 0xff, FALSE), 103 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, 104 bfd_elf_generic_reloc, "R_386_PC8", 105 TRUE, 0xff, 0xff, TRUE), 106 107#define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset) 108#define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext) 109 /* These are common with Solaris TLS implementation. */ 110 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 111 bfd_elf_generic_reloc, "R_386_TLS_LDO_32", 112 TRUE, 0xffffffff, 0xffffffff, FALSE), 113 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 114 bfd_elf_generic_reloc, "R_386_TLS_IE_32", 115 TRUE, 0xffffffff, 0xffffffff, FALSE), 116 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 117 bfd_elf_generic_reloc, "R_386_TLS_LE_32", 118 TRUE, 0xffffffff, 0xffffffff, FALSE), 119 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 120 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32", 121 TRUE, 0xffffffff, 0xffffffff, FALSE), 122 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 123 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32", 124 TRUE, 0xffffffff, 0xffffffff, FALSE), 125 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 126 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32", 127 TRUE, 0xffffffff, 0xffffffff, FALSE), 128 129 /* Another gap. */ 130#define R_386_tls (R_386_TLS_TPOFF32 + 1 - R_386_tls_offset) 131#define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls) 132 133/* GNU extension to record C++ vtable hierarchy. */ 134 HOWTO (R_386_GNU_VTINHERIT, /* type */ 135 0, /* rightshift */ 136 2, /* size (0 = byte, 1 = short, 2 = long) */ 137 0, /* bitsize */ 138 FALSE, /* pc_relative */ 139 0, /* bitpos */ 140 complain_overflow_dont, /* complain_on_overflow */ 141 NULL, /* special_function */ 142 "R_386_GNU_VTINHERIT", /* name */ 143 FALSE, /* partial_inplace */ 144 0, /* src_mask */ 145 0, /* dst_mask */ 146 FALSE), /* pcrel_offset */ 147 148/* GNU extension to record C++ vtable member usage. */ 149 HOWTO (R_386_GNU_VTENTRY, /* type */ 150 0, /* rightshift */ 151 2, /* size (0 = byte, 1 = short, 2 = long) */ 152 0, /* bitsize */ 153 FALSE, /* pc_relative */ 154 0, /* bitpos */ 155 complain_overflow_dont, /* complain_on_overflow */ 156 _bfd_elf_rel_vtable_reloc_fn, /* special_function */ 157 "R_386_GNU_VTENTRY", /* name */ 158 FALSE, /* partial_inplace */ 159 0, /* src_mask */ 160 0, /* dst_mask */ 161 FALSE) /* pcrel_offset */ 162 163#define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset) 164 165}; 166 167#ifdef DEBUG_GEN_RELOC 168#define TRACE(str) \ 169 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) 170#else 171#define TRACE(str) 172#endif 173 174static reloc_howto_type * 175elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 176 bfd_reloc_code_real_type code) 177{ 178 switch (code) 179 { 180 case BFD_RELOC_NONE: 181 TRACE ("BFD_RELOC_NONE"); 182 return &elf_howto_table[R_386_NONE]; 183 184 case BFD_RELOC_32: 185 TRACE ("BFD_RELOC_32"); 186 return &elf_howto_table[R_386_32]; 187 188 case BFD_RELOC_CTOR: 189 TRACE ("BFD_RELOC_CTOR"); 190 return &elf_howto_table[R_386_32]; 191 192 case BFD_RELOC_32_PCREL: 193 TRACE ("BFD_RELOC_PC32"); 194 return &elf_howto_table[R_386_PC32]; 195 196 case BFD_RELOC_386_GOT32: 197 TRACE ("BFD_RELOC_386_GOT32"); 198 return &elf_howto_table[R_386_GOT32]; 199 200 case BFD_RELOC_386_PLT32: 201 TRACE ("BFD_RELOC_386_PLT32"); 202 return &elf_howto_table[R_386_PLT32]; 203 204 case BFD_RELOC_386_COPY: 205 TRACE ("BFD_RELOC_386_COPY"); 206 return &elf_howto_table[R_386_COPY]; 207 208 case BFD_RELOC_386_GLOB_DAT: 209 TRACE ("BFD_RELOC_386_GLOB_DAT"); 210 return &elf_howto_table[R_386_GLOB_DAT]; 211 212 case BFD_RELOC_386_JUMP_SLOT: 213 TRACE ("BFD_RELOC_386_JUMP_SLOT"); 214 return &elf_howto_table[R_386_JUMP_SLOT]; 215 216 case BFD_RELOC_386_RELATIVE: 217 TRACE ("BFD_RELOC_386_RELATIVE"); 218 return &elf_howto_table[R_386_RELATIVE]; 219 220 case BFD_RELOC_386_GOTOFF: 221 TRACE ("BFD_RELOC_386_GOTOFF"); 222 return &elf_howto_table[R_386_GOTOFF]; 223 224 case BFD_RELOC_386_GOTPC: 225 TRACE ("BFD_RELOC_386_GOTPC"); 226 return &elf_howto_table[R_386_GOTPC]; 227 228 /* These relocs are a GNU extension. */ 229 case BFD_RELOC_386_TLS_TPOFF: 230 TRACE ("BFD_RELOC_386_TLS_TPOFF"); 231 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset]; 232 233 case BFD_RELOC_386_TLS_IE: 234 TRACE ("BFD_RELOC_386_TLS_IE"); 235 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset]; 236 237 case BFD_RELOC_386_TLS_GOTIE: 238 TRACE ("BFD_RELOC_386_TLS_GOTIE"); 239 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset]; 240 241 case BFD_RELOC_386_TLS_LE: 242 TRACE ("BFD_RELOC_386_TLS_LE"); 243 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset]; 244 245 case BFD_RELOC_386_TLS_GD: 246 TRACE ("BFD_RELOC_386_TLS_GD"); 247 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset]; 248 249 case BFD_RELOC_386_TLS_LDM: 250 TRACE ("BFD_RELOC_386_TLS_LDM"); 251 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset]; 252 253 case BFD_RELOC_16: 254 TRACE ("BFD_RELOC_16"); 255 return &elf_howto_table[R_386_16 - R_386_ext_offset]; 256 257 case BFD_RELOC_16_PCREL: 258 TRACE ("BFD_RELOC_16_PCREL"); 259 return &elf_howto_table[R_386_PC16 - R_386_ext_offset]; 260 261 case BFD_RELOC_8: 262 TRACE ("BFD_RELOC_8"); 263 return &elf_howto_table[R_386_8 - R_386_ext_offset]; 264 265 case BFD_RELOC_8_PCREL: 266 TRACE ("BFD_RELOC_8_PCREL"); 267 return &elf_howto_table[R_386_PC8 - R_386_ext_offset]; 268 269 /* Common with Sun TLS implementation. */ 270 case BFD_RELOC_386_TLS_LDO_32: 271 TRACE ("BFD_RELOC_386_TLS_LDO_32"); 272 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset]; 273 274 case BFD_RELOC_386_TLS_IE_32: 275 TRACE ("BFD_RELOC_386_TLS_IE_32"); 276 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset]; 277 278 case BFD_RELOC_386_TLS_LE_32: 279 TRACE ("BFD_RELOC_386_TLS_LE_32"); 280 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset]; 281 282 case BFD_RELOC_386_TLS_DTPMOD32: 283 TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); 284 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset]; 285 286 case BFD_RELOC_386_TLS_DTPOFF32: 287 TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); 288 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset]; 289 290 case BFD_RELOC_386_TLS_TPOFF32: 291 TRACE ("BFD_RELOC_386_TLS_TPOFF32"); 292 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset]; 293 294 case BFD_RELOC_VTABLE_INHERIT: 295 TRACE ("BFD_RELOC_VTABLE_INHERIT"); 296 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset]; 297 298 case BFD_RELOC_VTABLE_ENTRY: 299 TRACE ("BFD_RELOC_VTABLE_ENTRY"); 300 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset]; 301 302 default: 303 break; 304 } 305 306 TRACE ("Unknown"); 307 return 0; 308} 309 310static void 311elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, 312 arelent *cache_ptr, 313 Elf_Internal_Rela *dst) 314{ 315 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 316 unsigned int indx; 317 318 if ((indx = r_type) >= R_386_standard 319 && ((indx = r_type - R_386_ext_offset) - R_386_standard 320 >= R_386_ext - R_386_standard) 321 && ((indx = r_type - R_386_tls_offset) - R_386_ext 322 >= R_386_tls - R_386_ext) 323 && ((indx = r_type - R_386_vt_offset) - R_386_tls 324 >= R_386_vt - R_386_tls)) 325 { 326 (*_bfd_error_handler) (_("%s: invalid relocation type %d"), 327 bfd_archive_filename (abfd), (int) r_type); 328 indx = R_386_NONE; 329 } 330 cache_ptr->howto = &elf_howto_table[indx]; 331} 332 333/* Return whether a symbol name implies a local label. The UnixWare 334 2.1 cc generates temporary symbols that start with .X, so we 335 recognize them here. FIXME: do other SVR4 compilers also use .X?. 336 If so, we should move the .X recognition into 337 _bfd_elf_is_local_label_name. */ 338 339static bfd_boolean 340elf_i386_is_local_label_name (bfd *abfd, const char *name) 341{ 342 if (name[0] == '.' && name[1] == 'X') 343 return TRUE; 344 345 return _bfd_elf_is_local_label_name (abfd, name); 346} 347 348/* Support for core dump NOTE sections. */ 349 350static bfd_boolean 351elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 352{ 353 int offset; 354 size_t raw_size; 355 356 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 357 { 358 int pr_version = bfd_get_32 (abfd, note->descdata); 359 360 if (pr_version != 1) 361 return FALSE; 362 363 /* pr_cursig */ 364 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20); 365 366 /* pr_pid */ 367 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); 368 369 /* pr_reg */ 370 offset = 28; 371 raw_size = bfd_get_32 (abfd, note->descdata + 8); 372 } 373 else 374 { 375 switch (note->descsz) 376 { 377 default: 378 return FALSE; 379 380 case 144: /* Linux/i386 */ 381 /* pr_cursig */ 382 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 383 384 /* pr_pid */ 385 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); 386 387 /* pr_reg */ 388 offset = 72; 389 raw_size = 68; 390 391 break; 392 } 393 } 394 395 /* Make a ".reg/999" section. */ 396 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 397 raw_size, note->descpos + offset); 398} 399 400static bfd_boolean 401elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 402{ 403 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) 404 { 405 int pr_version = bfd_get_32 (abfd, note->descdata); 406 407 if (pr_version != 1) 408 return FALSE; 409 410 elf_tdata (abfd)->core_program 411 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); 412 elf_tdata (abfd)->core_command 413 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); 414 } 415 else 416 { 417 switch (note->descsz) 418 { 419 default: 420 return FALSE; 421 422 case 124: /* Linux/i386 elf_prpsinfo. */ 423 elf_tdata (abfd)->core_program 424 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); 425 elf_tdata (abfd)->core_command 426 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); 427 } 428 } 429 430 /* Note that for some reason, a spurious space is tacked 431 onto the end of the args in some (at least one anyway) 432 implementations, so strip it off if it exists. */ 433 { 434 char *command = elf_tdata (abfd)->core_command; 435 int n = strlen (command); 436 437 if (0 < n && command[n - 1] == ' ') 438 command[n - 1] = '\0'; 439 } 440 441 return TRUE; 442} 443 444/* Functions for the i386 ELF linker. 445 446 In order to gain some understanding of code in this file without 447 knowing all the intricate details of the linker, note the 448 following: 449 450 Functions named elf_i386_* are called by external routines, other 451 functions are only called locally. elf_i386_* functions appear 452 in this file more or less in the order in which they are called 453 from external routines. eg. elf_i386_check_relocs is called 454 early in the link process, elf_i386_finish_dynamic_sections is 455 one of the last functions. */ 456 457 458/* The name of the dynamic interpreter. This is put in the .interp 459 section. */ 460 461#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" 462 463/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 464 copying dynamic variables from a shared lib into an app's dynbss 465 section, and instead use a dynamic relocation to point into the 466 shared lib. */ 467#define ELIMINATE_COPY_RELOCS 1 468 469/* The size in bytes of an entry in the procedure linkage table. */ 470 471#define PLT_ENTRY_SIZE 16 472 473/* The first entry in an absolute procedure linkage table looks like 474 this. See the SVR4 ABI i386 supplement to see how this works. */ 475 476static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] = 477{ 478 0xff, 0x35, /* pushl contents of address */ 479 0, 0, 0, 0, /* replaced with address of .got + 4. */ 480 0xff, 0x25, /* jmp indirect */ 481 0, 0, 0, 0, /* replaced with address of .got + 8. */ 482 0, 0, 0, 0 /* pad out to 16 bytes. */ 483}; 484 485/* Subsequent entries in an absolute procedure linkage table look like 486 this. */ 487 488static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = 489{ 490 0xff, 0x25, /* jmp indirect */ 491 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ 492 0x68, /* pushl immediate */ 493 0, 0, 0, 0, /* replaced with offset into relocation table. */ 494 0xe9, /* jmp relative */ 495 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 496}; 497 498/* The first entry in a PIC procedure linkage table look like this. */ 499 500static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] = 501{ 502 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ 503 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ 504 0, 0, 0, 0 /* pad out to 16 bytes. */ 505}; 506 507/* Subsequent entries in a PIC procedure linkage table look like this. */ 508 509static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = 510{ 511 0xff, 0xa3, /* jmp *offset(%ebx) */ 512 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ 513 0x68, /* pushl immediate */ 514 0, 0, 0, 0, /* replaced with offset into relocation table. */ 515 0xe9, /* jmp relative */ 516 0, 0, 0, 0 /* replaced with offset to start of .plt. */ 517}; 518 519/* The i386 linker needs to keep track of the number of relocs that it 520 decides to copy as dynamic relocs in check_relocs for each symbol. 521 This is so that it can later discard them if they are found to be 522 unnecessary. We store the information in a field extending the 523 regular ELF linker hash table. */ 524 525struct elf_i386_dyn_relocs 526{ 527 struct elf_i386_dyn_relocs *next; 528 529 /* The input section of the reloc. */ 530 asection *sec; 531 532 /* Total number of relocs copied for the input section. */ 533 bfd_size_type count; 534 535 /* Number of pc-relative relocs copied for the input section. */ 536 bfd_size_type pc_count; 537}; 538 539/* i386 ELF linker hash entry. */ 540 541struct elf_i386_link_hash_entry 542{ 543 struct elf_link_hash_entry elf; 544 545 /* Track dynamic relocs copied for this symbol. */ 546 struct elf_i386_dyn_relocs *dyn_relocs; 547 548#define GOT_UNKNOWN 0 549#define GOT_NORMAL 1 550#define GOT_TLS_GD 2 551#define GOT_TLS_IE 4 552#define GOT_TLS_IE_POS 5 553#define GOT_TLS_IE_NEG 6 554#define GOT_TLS_IE_BOTH 7 555 unsigned char tls_type; 556}; 557 558#define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent)) 559 560struct elf_i386_obj_tdata 561{ 562 struct elf_obj_tdata root; 563 564 /* tls_type for each local got entry. */ 565 char *local_got_tls_type; 566}; 567 568#define elf_i386_tdata(abfd) \ 569 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any) 570 571#define elf_i386_local_got_tls_type(abfd) \ 572 (elf_i386_tdata (abfd)->local_got_tls_type) 573 574static bfd_boolean 575elf_i386_mkobject (bfd *abfd) 576{ 577 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata); 578 abfd->tdata.any = bfd_zalloc (abfd, amt); 579 if (abfd->tdata.any == NULL) 580 return FALSE; 581 return TRUE; 582} 583 584/* i386 ELF linker hash table. */ 585 586struct elf_i386_link_hash_table 587{ 588 struct elf_link_hash_table elf; 589 590 /* Short-cuts to get to dynamic linker sections. */ 591 asection *sgot; 592 asection *sgotplt; 593 asection *srelgot; 594 asection *splt; 595 asection *srelplt; 596 asection *sdynbss; 597 asection *srelbss; 598 599 union { 600 bfd_signed_vma refcount; 601 bfd_vma offset; 602 } tls_ldm_got; 603 604 /* Small local sym to section mapping cache. */ 605 struct sym_sec_cache sym_sec; 606}; 607 608/* Get the i386 ELF linker hash table from a link_info structure. */ 609 610#define elf_i386_hash_table(p) \ 611 ((struct elf_i386_link_hash_table *) ((p)->hash)) 612 613/* Create an entry in an i386 ELF linker hash table. */ 614 615static struct bfd_hash_entry * 616link_hash_newfunc (struct bfd_hash_entry *entry, 617 struct bfd_hash_table *table, 618 const char *string) 619{ 620 /* Allocate the structure if it has not already been allocated by a 621 subclass. */ 622 if (entry == NULL) 623 { 624 entry = bfd_hash_allocate (table, 625 sizeof (struct elf_i386_link_hash_entry)); 626 if (entry == NULL) 627 return entry; 628 } 629 630 /* Call the allocation method of the superclass. */ 631 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 632 if (entry != NULL) 633 { 634 struct elf_i386_link_hash_entry *eh; 635 636 eh = (struct elf_i386_link_hash_entry *) entry; 637 eh->dyn_relocs = NULL; 638 eh->tls_type = GOT_UNKNOWN; 639 } 640 641 return entry; 642} 643 644/* Create an i386 ELF linker hash table. */ 645 646static struct bfd_link_hash_table * 647elf_i386_link_hash_table_create (bfd *abfd) 648{ 649 struct elf_i386_link_hash_table *ret; 650 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); 651 652 ret = bfd_malloc (amt); 653 if (ret == NULL) 654 return NULL; 655 656 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc)) 657 { 658 free (ret); 659 return NULL; 660 } 661 662 ret->sgot = NULL; 663 ret->sgotplt = NULL; 664 ret->srelgot = NULL; 665 ret->splt = NULL; 666 ret->srelplt = NULL; 667 ret->sdynbss = NULL; 668 ret->srelbss = NULL; 669 ret->tls_ldm_got.refcount = 0; 670 ret->sym_sec.abfd = NULL; 671 672 return &ret->elf.root; 673} 674 675/* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up 676 shortcuts to them in our hash table. */ 677 678static bfd_boolean 679create_got_section (bfd *dynobj, struct bfd_link_info *info) 680{ 681 struct elf_i386_link_hash_table *htab; 682 683 if (! _bfd_elf_create_got_section (dynobj, info)) 684 return FALSE; 685 686 htab = elf_i386_hash_table (info); 687 htab->sgot = bfd_get_section_by_name (dynobj, ".got"); 688 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); 689 if (!htab->sgot || !htab->sgotplt) 690 abort (); 691 692 htab->srelgot = bfd_make_section (dynobj, ".rel.got"); 693 if (htab->srelgot == NULL 694 || ! bfd_set_section_flags (dynobj, htab->srelgot, 695 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS 696 | SEC_IN_MEMORY | SEC_LINKER_CREATED 697 | SEC_READONLY)) 698 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) 699 return FALSE; 700 return TRUE; 701} 702 703/* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and 704 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our 705 hash table. */ 706 707static bfd_boolean 708elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 709{ 710 struct elf_i386_link_hash_table *htab; 711 712 htab = elf_i386_hash_table (info); 713 if (!htab->sgot && !create_got_section (dynobj, info)) 714 return FALSE; 715 716 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 717 return FALSE; 718 719 htab->splt = bfd_get_section_by_name (dynobj, ".plt"); 720 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); 721 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 722 if (!info->shared) 723 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); 724 725 if (!htab->splt || !htab->srelplt || !htab->sdynbss 726 || (!info->shared && !htab->srelbss)) 727 abort (); 728 729 return TRUE; 730} 731 732/* Copy the extra info we tack onto an elf_link_hash_entry. */ 733 734static void 735elf_i386_copy_indirect_symbol (const struct elf_backend_data *bed, 736 struct elf_link_hash_entry *dir, 737 struct elf_link_hash_entry *ind) 738{ 739 struct elf_i386_link_hash_entry *edir, *eind; 740 741 edir = (struct elf_i386_link_hash_entry *) dir; 742 eind = (struct elf_i386_link_hash_entry *) ind; 743 744 if (eind->dyn_relocs != NULL) 745 { 746 if (edir->dyn_relocs != NULL) 747 { 748 struct elf_i386_dyn_relocs **pp; 749 struct elf_i386_dyn_relocs *p; 750 751 if (ind->root.type == bfd_link_hash_indirect) 752 abort (); 753 754 /* Add reloc counts against the weak sym to the strong sym 755 list. Merge any entries against the same section. */ 756 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 757 { 758 struct elf_i386_dyn_relocs *q; 759 760 for (q = edir->dyn_relocs; q != NULL; q = q->next) 761 if (q->sec == p->sec) 762 { 763 q->pc_count += p->pc_count; 764 q->count += p->count; 765 *pp = p->next; 766 break; 767 } 768 if (q == NULL) 769 pp = &p->next; 770 } 771 *pp = edir->dyn_relocs; 772 } 773 774 edir->dyn_relocs = eind->dyn_relocs; 775 eind->dyn_relocs = NULL; 776 } 777 778 if (ind->root.type == bfd_link_hash_indirect 779 && dir->got.refcount <= 0) 780 { 781 edir->tls_type = eind->tls_type; 782 eind->tls_type = GOT_UNKNOWN; 783 } 784 785 if (ELIMINATE_COPY_RELOCS 786 && ind->root.type != bfd_link_hash_indirect 787 && (dir->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0) 788 /* If called to transfer flags for a weakdef during processing 789 of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF. 790 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 791 dir->elf_link_hash_flags |= 792 (ind->elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC 793 | ELF_LINK_HASH_REF_REGULAR 794 | ELF_LINK_HASH_REF_REGULAR_NONWEAK 795 | ELF_LINK_HASH_NEEDS_PLT 796 | ELF_LINK_POINTER_EQUALITY_NEEDED)); 797 else 798 _bfd_elf_link_hash_copy_indirect (bed, dir, ind); 799} 800 801static int 802elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local) 803{ 804 if (info->shared) 805 return r_type; 806 807 switch (r_type) 808 { 809 case R_386_TLS_GD: 810 case R_386_TLS_IE_32: 811 if (is_local) 812 return R_386_TLS_LE_32; 813 return R_386_TLS_IE_32; 814 case R_386_TLS_IE: 815 case R_386_TLS_GOTIE: 816 if (is_local) 817 return R_386_TLS_LE_32; 818 return r_type; 819 case R_386_TLS_LDM: 820 return R_386_TLS_LE_32; 821 } 822 823 return r_type; 824} 825 826/* Look through the relocs for a section during the first phase, and 827 calculate needed space in the global offset table, procedure linkage 828 table, and dynamic reloc sections. */ 829 830static bfd_boolean 831elf_i386_check_relocs (bfd *abfd, 832 struct bfd_link_info *info, 833 asection *sec, 834 const Elf_Internal_Rela *relocs) 835{ 836 struct elf_i386_link_hash_table *htab; 837 Elf_Internal_Shdr *symtab_hdr; 838 struct elf_link_hash_entry **sym_hashes; 839 const Elf_Internal_Rela *rel; 840 const Elf_Internal_Rela *rel_end; 841 asection *sreloc; 842 843 if (info->relocatable) 844 return TRUE; 845 846 htab = elf_i386_hash_table (info); 847 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 848 sym_hashes = elf_sym_hashes (abfd); 849 850 sreloc = NULL; 851 852 rel_end = relocs + sec->reloc_count; 853 for (rel = relocs; rel < rel_end; rel++) 854 { 855 unsigned int r_type; 856 unsigned long r_symndx; 857 struct elf_link_hash_entry *h; 858 859 r_symndx = ELF32_R_SYM (rel->r_info); 860 r_type = ELF32_R_TYPE (rel->r_info); 861 862 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) 863 { 864 (*_bfd_error_handler) (_("%s: bad symbol index: %d"), 865 bfd_archive_filename (abfd), 866 r_symndx); 867 return FALSE; 868 } 869 870 if (r_symndx < symtab_hdr->sh_info) 871 h = NULL; 872 else 873 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 874 875 r_type = elf_i386_tls_transition (info, r_type, h == NULL); 876 877 switch (r_type) 878 { 879 case R_386_TLS_LDM: 880 htab->tls_ldm_got.refcount += 1; 881 goto create_got; 882 883 case R_386_PLT32: 884 /* This symbol requires a procedure linkage table entry. We 885 actually build the entry in adjust_dynamic_symbol, 886 because this might be a case of linking PIC code which is 887 never referenced by a dynamic object, in which case we 888 don't need to generate a procedure linkage table entry 889 after all. */ 890 891 /* If this is a local symbol, we resolve it directly without 892 creating a procedure linkage table entry. */ 893 if (h == NULL) 894 continue; 895 896 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; 897 h->plt.refcount += 1; 898 break; 899 900 case R_386_TLS_IE_32: 901 case R_386_TLS_IE: 902 case R_386_TLS_GOTIE: 903 if (info->shared) 904 info->flags |= DF_STATIC_TLS; 905 /* Fall through */ 906 907 case R_386_GOT32: 908 case R_386_TLS_GD: 909 /* This symbol requires a global offset table entry. */ 910 { 911 int tls_type, old_tls_type; 912 913 switch (r_type) 914 { 915 default: 916 case R_386_GOT32: tls_type = GOT_NORMAL; break; 917 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; 918 case R_386_TLS_IE_32: 919 if (ELF32_R_TYPE (rel->r_info) == r_type) 920 tls_type = GOT_TLS_IE_NEG; 921 else 922 /* If this is a GD->IE transition, we may use either of 923 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ 924 tls_type = GOT_TLS_IE; 925 break; 926 case R_386_TLS_IE: 927 case R_386_TLS_GOTIE: 928 tls_type = GOT_TLS_IE_POS; break; 929 } 930 931 if (h != NULL) 932 { 933 h->got.refcount += 1; 934 old_tls_type = elf_i386_hash_entry(h)->tls_type; 935 } 936 else 937 { 938 bfd_signed_vma *local_got_refcounts; 939 940 /* This is a global offset table entry for a local symbol. */ 941 local_got_refcounts = elf_local_got_refcounts (abfd); 942 if (local_got_refcounts == NULL) 943 { 944 bfd_size_type size; 945 946 size = symtab_hdr->sh_info; 947 size *= (sizeof (bfd_signed_vma) + sizeof(char)); 948 local_got_refcounts = bfd_zalloc (abfd, size); 949 if (local_got_refcounts == NULL) 950 return FALSE; 951 elf_local_got_refcounts (abfd) = local_got_refcounts; 952 elf_i386_local_got_tls_type (abfd) 953 = (char *) (local_got_refcounts + symtab_hdr->sh_info); 954 } 955 local_got_refcounts[r_symndx] += 1; 956 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx]; 957 } 958 959 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) 960 tls_type |= old_tls_type; 961 /* If a TLS symbol is accessed using IE at least once, 962 there is no point to use dynamic model for it. */ 963 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN 964 && (old_tls_type != GOT_TLS_GD 965 || (tls_type & GOT_TLS_IE) == 0)) 966 { 967 if ((old_tls_type & GOT_TLS_IE) && tls_type == GOT_TLS_GD) 968 tls_type = old_tls_type; 969 else 970 { 971 (*_bfd_error_handler) 972 (_("%s: `%s' accessed both as normal and " 973 "thread local symbol"), 974 bfd_archive_filename (abfd), 975 h ? h->root.root.string : "<local>"); 976 return FALSE; 977 } 978 } 979 980 if (old_tls_type != tls_type) 981 { 982 if (h != NULL) 983 elf_i386_hash_entry (h)->tls_type = tls_type; 984 else 985 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type; 986 } 987 } 988 /* Fall through */ 989 990 case R_386_GOTOFF: 991 case R_386_GOTPC: 992 create_got: 993 if (htab->sgot == NULL) 994 { 995 if (htab->elf.dynobj == NULL) 996 htab->elf.dynobj = abfd; 997 if (!create_got_section (htab->elf.dynobj, info)) 998 return FALSE; 999 } 1000 if (r_type != R_386_TLS_IE) 1001 break; 1002 /* Fall through */ 1003 1004 case R_386_TLS_LE_32: 1005 case R_386_TLS_LE: 1006 if (!info->shared) 1007 break; 1008 info->flags |= DF_STATIC_TLS; 1009 /* Fall through */ 1010 1011 case R_386_32: 1012 case R_386_PC32: 1013 if (h != NULL && !info->shared) 1014 { 1015 /* If this reloc is in a read-only section, we might 1016 need a copy reloc. We can't check reliably at this 1017 stage whether the section is read-only, as input 1018 sections have not yet been mapped to output sections. 1019 Tentatively set the flag for now, and correct in 1020 adjust_dynamic_symbol. */ 1021 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; 1022 1023 /* We may need a .plt entry if the function this reloc 1024 refers to is in a shared lib. */ 1025 h->plt.refcount += 1; 1026 if (r_type != R_386_PC32) 1027 h->elf_link_hash_flags |= ELF_LINK_POINTER_EQUALITY_NEEDED; 1028 } 1029 1030 /* If we are creating a shared library, and this is a reloc 1031 against a global symbol, or a non PC relative reloc 1032 against a local symbol, then we need to copy the reloc 1033 into the shared library. However, if we are linking with 1034 -Bsymbolic, we do not need to copy a reloc against a 1035 global symbol which is defined in an object we are 1036 including in the link (i.e., DEF_REGULAR is set). At 1037 this point we have not seen all the input files, so it is 1038 possible that DEF_REGULAR is not set now but will be set 1039 later (it is never cleared). In case of a weak definition, 1040 DEF_REGULAR may be cleared later by a strong definition in 1041 a shared library. We account for that possibility below by 1042 storing information in the relocs_copied field of the hash 1043 table entry. A similar situation occurs when creating 1044 shared libraries and symbol visibility changes render the 1045 symbol local. 1046 1047 If on the other hand, we are creating an executable, we 1048 may need to keep relocations for symbols satisfied by a 1049 dynamic library if we manage to avoid copy relocs for the 1050 symbol. */ 1051 if ((info->shared 1052 && (sec->flags & SEC_ALLOC) != 0 1053 && (r_type != R_386_PC32 1054 || (h != NULL 1055 && (! info->symbolic 1056 || h->root.type == bfd_link_hash_defweak 1057 || (h->elf_link_hash_flags 1058 & ELF_LINK_HASH_DEF_REGULAR) == 0)))) 1059 || (ELIMINATE_COPY_RELOCS 1060 && !info->shared 1061 && (sec->flags & SEC_ALLOC) != 0 1062 && h != NULL 1063 && (h->root.type == bfd_link_hash_defweak 1064 || (h->elf_link_hash_flags 1065 & ELF_LINK_HASH_DEF_REGULAR) == 0))) 1066 { 1067 struct elf_i386_dyn_relocs *p; 1068 struct elf_i386_dyn_relocs **head; 1069 1070 /* We must copy these reloc types into the output file. 1071 Create a reloc section in dynobj and make room for 1072 this reloc. */ 1073 if (sreloc == NULL) 1074 { 1075 const char *name; 1076 bfd *dynobj; 1077 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx; 1078 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name; 1079 1080 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam); 1081 if (name == NULL) 1082 return FALSE; 1083 1084 if (strncmp (name, ".rel", 4) != 0 1085 || strcmp (bfd_get_section_name (abfd, sec), 1086 name + 4) != 0) 1087 { 1088 (*_bfd_error_handler) 1089 (_("%s: bad relocation section name `%s\'"), 1090 bfd_archive_filename (abfd), name); 1091 } 1092 1093 if (htab->elf.dynobj == NULL) 1094 htab->elf.dynobj = abfd; 1095 1096 dynobj = htab->elf.dynobj; 1097 sreloc = bfd_get_section_by_name (dynobj, name); 1098 if (sreloc == NULL) 1099 { 1100 flagword flags; 1101 1102 sreloc = bfd_make_section (dynobj, name); 1103 flags = (SEC_HAS_CONTENTS | SEC_READONLY 1104 | SEC_IN_MEMORY | SEC_LINKER_CREATED); 1105 if ((sec->flags & SEC_ALLOC) != 0) 1106 flags |= SEC_ALLOC | SEC_LOAD; 1107 if (sreloc == NULL 1108 || ! bfd_set_section_flags (dynobj, sreloc, flags) 1109 || ! bfd_set_section_alignment (dynobj, sreloc, 2)) 1110 return FALSE; 1111 } 1112 elf_section_data (sec)->sreloc = sreloc; 1113 } 1114 1115 /* If this is a global symbol, we count the number of 1116 relocations we need for this symbol. */ 1117 if (h != NULL) 1118 { 1119 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs; 1120 } 1121 else 1122 { 1123 /* Track dynamic relocs needed for local syms too. 1124 We really need local syms available to do this 1125 easily. Oh well. */ 1126 1127 asection *s; 1128 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 1129 sec, r_symndx); 1130 if (s == NULL) 1131 return FALSE; 1132 1133 head = ((struct elf_i386_dyn_relocs **) 1134 &elf_section_data (s)->local_dynrel); 1135 } 1136 1137 p = *head; 1138 if (p == NULL || p->sec != sec) 1139 { 1140 bfd_size_type amt = sizeof *p; 1141 p = bfd_alloc (htab->elf.dynobj, amt); 1142 if (p == NULL) 1143 return FALSE; 1144 p->next = *head; 1145 *head = p; 1146 p->sec = sec; 1147 p->count = 0; 1148 p->pc_count = 0; 1149 } 1150 1151 p->count += 1; 1152 if (r_type == R_386_PC32) 1153 p->pc_count += 1; 1154 } 1155 break; 1156 1157 /* This relocation describes the C++ object vtable hierarchy. 1158 Reconstruct it for later use during GC. */ 1159 case R_386_GNU_VTINHERIT: 1160 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 1161 return FALSE; 1162 break; 1163 1164 /* This relocation describes which C++ vtable entries are actually 1165 used. Record for later use during GC. */ 1166 case R_386_GNU_VTENTRY: 1167 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) 1168 return FALSE; 1169 break; 1170 1171 default: 1172 break; 1173 } 1174 } 1175 1176 return TRUE; 1177} 1178 1179/* Return the section that should be marked against GC for a given 1180 relocation. */ 1181 1182static asection * 1183elf_i386_gc_mark_hook (asection *sec, 1184 struct bfd_link_info *info ATTRIBUTE_UNUSED, 1185 Elf_Internal_Rela *rel, 1186 struct elf_link_hash_entry *h, 1187 Elf_Internal_Sym *sym) 1188{ 1189 if (h != NULL) 1190 { 1191 switch (ELF32_R_TYPE (rel->r_info)) 1192 { 1193 case R_386_GNU_VTINHERIT: 1194 case R_386_GNU_VTENTRY: 1195 break; 1196 1197 default: 1198 switch (h->root.type) 1199 { 1200 case bfd_link_hash_defined: 1201 case bfd_link_hash_defweak: 1202 return h->root.u.def.section; 1203 1204 case bfd_link_hash_common: 1205 return h->root.u.c.p->section; 1206 1207 default: 1208 break; 1209 } 1210 } 1211 } 1212 else 1213 return bfd_section_from_elf_index (sec->owner, sym->st_shndx); 1214 1215 return NULL; 1216} 1217 1218/* Update the got entry reference counts for the section being removed. */ 1219 1220static bfd_boolean 1221elf_i386_gc_sweep_hook (bfd *abfd, 1222 struct bfd_link_info *info, 1223 asection *sec, 1224 const Elf_Internal_Rela *relocs) 1225{ 1226 Elf_Internal_Shdr *symtab_hdr; 1227 struct elf_link_hash_entry **sym_hashes; 1228 bfd_signed_vma *local_got_refcounts; 1229 const Elf_Internal_Rela *rel, *relend; 1230 1231 elf_section_data (sec)->local_dynrel = NULL; 1232 1233 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 1234 sym_hashes = elf_sym_hashes (abfd); 1235 local_got_refcounts = elf_local_got_refcounts (abfd); 1236 1237 relend = relocs + sec->reloc_count; 1238 for (rel = relocs; rel < relend; rel++) 1239 { 1240 unsigned long r_symndx; 1241 unsigned int r_type; 1242 struct elf_link_hash_entry *h = NULL; 1243 1244 r_symndx = ELF32_R_SYM (rel->r_info); 1245 if (r_symndx >= symtab_hdr->sh_info) 1246 { 1247 struct elf_i386_link_hash_entry *eh; 1248 struct elf_i386_dyn_relocs **pp; 1249 struct elf_i386_dyn_relocs *p; 1250 1251 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 1252 eh = (struct elf_i386_link_hash_entry *) h; 1253 1254 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 1255 if (p->sec == sec) 1256 { 1257 /* Everything must go for SEC. */ 1258 *pp = p->next; 1259 break; 1260 } 1261 } 1262 1263 r_type = ELF32_R_TYPE (rel->r_info); 1264 r_type = elf_i386_tls_transition (info, r_type, h != NULL); 1265 switch (r_type) 1266 { 1267 case R_386_TLS_LDM: 1268 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0) 1269 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1; 1270 break; 1271 1272 case R_386_TLS_GD: 1273 case R_386_TLS_IE_32: 1274 case R_386_TLS_IE: 1275 case R_386_TLS_GOTIE: 1276 case R_386_GOT32: 1277 if (h != NULL) 1278 { 1279 if (h->got.refcount > 0) 1280 h->got.refcount -= 1; 1281 } 1282 else if (local_got_refcounts != NULL) 1283 { 1284 if (local_got_refcounts[r_symndx] > 0) 1285 local_got_refcounts[r_symndx] -= 1; 1286 } 1287 break; 1288 1289 case R_386_32: 1290 case R_386_PC32: 1291 if (info->shared) 1292 break; 1293 /* Fall through */ 1294 1295 case R_386_PLT32: 1296 if (h != NULL) 1297 { 1298 if (h->plt.refcount > 0) 1299 h->plt.refcount -= 1; 1300 } 1301 break; 1302 1303 default: 1304 break; 1305 } 1306 } 1307 1308 return TRUE; 1309} 1310 1311/* Adjust a symbol defined by a dynamic object and referenced by a 1312 regular object. The current definition is in some section of the 1313 dynamic object, but we're not including those sections. We have to 1314 change the definition to something the rest of the link can 1315 understand. */ 1316 1317static bfd_boolean 1318elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info, 1319 struct elf_link_hash_entry *h) 1320{ 1321 struct elf_i386_link_hash_table *htab; 1322 asection *s; 1323 unsigned int power_of_two; 1324 1325 /* If this is a function, put it in the procedure linkage table. We 1326 will fill in the contents of the procedure linkage table later, 1327 when we know the address of the .got section. */ 1328 if (h->type == STT_FUNC 1329 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) 1330 { 1331 if (h->plt.refcount <= 0 1332 || SYMBOL_CALLS_LOCAL (info, h) 1333 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1334 && h->root.type == bfd_link_hash_undefweak)) 1335 { 1336 /* This case can occur if we saw a PLT32 reloc in an input 1337 file, but the symbol was never referred to by a dynamic 1338 object, or if all references were garbage collected. In 1339 such a case, we don't actually need to build a procedure 1340 linkage table, and we can just do a PC32 reloc instead. */ 1341 h->plt.offset = (bfd_vma) -1; 1342 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 1343 } 1344 1345 return TRUE; 1346 } 1347 else 1348 /* It's possible that we incorrectly decided a .plt reloc was 1349 needed for an R_386_PC32 reloc to a non-function sym in 1350 check_relocs. We can't decide accurately between function and 1351 non-function syms in check-relocs; Objects loaded later in 1352 the link may change h->type. So fix it now. */ 1353 h->plt.offset = (bfd_vma) -1; 1354 1355 /* If this is a weak symbol, and there is a real definition, the 1356 processor independent code will have arranged for us to see the 1357 real definition first, and we can just use the same value. */ 1358 if (h->weakdef != NULL) 1359 { 1360 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined 1361 || h->weakdef->root.type == bfd_link_hash_defweak); 1362 h->root.u.def.section = h->weakdef->root.u.def.section; 1363 h->root.u.def.value = h->weakdef->root.u.def.value; 1364 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) 1365 h->elf_link_hash_flags 1366 = ((h->elf_link_hash_flags & ~ELF_LINK_NON_GOT_REF) 1367 | (h->weakdef->elf_link_hash_flags & ELF_LINK_NON_GOT_REF)); 1368 return TRUE; 1369 } 1370 1371 /* This is a reference to a symbol defined by a dynamic object which 1372 is not a function. */ 1373 1374 /* If we are creating a shared library, we must presume that the 1375 only references to the symbol are via the global offset table. 1376 For such cases we need not do anything here; the relocations will 1377 be handled correctly by relocate_section. */ 1378 if (info->shared) 1379 return TRUE; 1380 1381 /* If there are no references to this symbol that do not use the 1382 GOT, we don't need to generate a copy reloc. */ 1383 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) 1384 return TRUE; 1385 1386 /* If -z nocopyreloc was given, we won't generate them either. */ 1387 if (info->nocopyreloc) 1388 { 1389 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; 1390 return TRUE; 1391 } 1392 1393 if (ELIMINATE_COPY_RELOCS) 1394 { 1395 struct elf_i386_link_hash_entry * eh; 1396 struct elf_i386_dyn_relocs *p; 1397 1398 eh = (struct elf_i386_link_hash_entry *) h; 1399 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1400 { 1401 s = p->sec->output_section; 1402 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1403 break; 1404 } 1405 1406 /* If we didn't find any dynamic relocs in read-only sections, then 1407 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 1408 if (p == NULL) 1409 { 1410 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; 1411 return TRUE; 1412 } 1413 } 1414 1415 /* We must allocate the symbol in our .dynbss section, which will 1416 become part of the .bss section of the executable. There will be 1417 an entry for this symbol in the .dynsym section. The dynamic 1418 object will contain position independent code, so all references 1419 from the dynamic object to this symbol will go through the global 1420 offset table. The dynamic linker will use the .dynsym entry to 1421 determine the address it must put in the global offset table, so 1422 both the dynamic object and the regular object will refer to the 1423 same memory location for the variable. */ 1424 1425 htab = elf_i386_hash_table (info); 1426 1427 /* We must generate a R_386_COPY reloc to tell the dynamic linker to 1428 copy the initial value out of the dynamic object and into the 1429 runtime process image. */ 1430 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 1431 { 1432 htab->srelbss->_raw_size += sizeof (Elf32_External_Rel); 1433 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; 1434 } 1435 1436 /* We need to figure out the alignment required for this symbol. I 1437 have no idea how ELF linkers handle this. */ 1438 power_of_two = bfd_log2 (h->size); 1439 if (power_of_two > 3) 1440 power_of_two = 3; 1441 1442 /* Apply the required alignment. */ 1443 s = htab->sdynbss; 1444 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two)); 1445 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) 1446 { 1447 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) 1448 return FALSE; 1449 } 1450 1451 /* Define the symbol as being at this point in the section. */ 1452 h->root.u.def.section = s; 1453 h->root.u.def.value = s->_raw_size; 1454 1455 /* Increment the section size to make room for the symbol. */ 1456 s->_raw_size += h->size; 1457 1458 return TRUE; 1459} 1460 1461/* Allocate space in .plt, .got and associated reloc sections for 1462 dynamic relocs. */ 1463 1464static bfd_boolean 1465allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) 1466{ 1467 struct bfd_link_info *info; 1468 struct elf_i386_link_hash_table *htab; 1469 struct elf_i386_link_hash_entry *eh; 1470 struct elf_i386_dyn_relocs *p; 1471 1472 if (h->root.type == bfd_link_hash_indirect) 1473 return TRUE; 1474 1475 if (h->root.type == bfd_link_hash_warning) 1476 /* When warning symbols are created, they **replace** the "real" 1477 entry in the hash table, thus we never get to see the real 1478 symbol in a hash traversal. So look at it now. */ 1479 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1480 1481 info = (struct bfd_link_info *) inf; 1482 htab = elf_i386_hash_table (info); 1483 1484 if (htab->elf.dynamic_sections_created 1485 && h->plt.refcount > 0) 1486 { 1487 /* Make sure this symbol is output as a dynamic symbol. 1488 Undefined weak syms won't yet be marked as dynamic. */ 1489 if (h->dynindx == -1 1490 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) 1491 { 1492 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1493 return FALSE; 1494 } 1495 1496 if (info->shared 1497 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) 1498 { 1499 asection *s = htab->splt; 1500 1501 /* If this is the first .plt entry, make room for the special 1502 first entry. */ 1503 if (s->_raw_size == 0) 1504 s->_raw_size += PLT_ENTRY_SIZE; 1505 1506 h->plt.offset = s->_raw_size; 1507 1508 /* If this symbol is not defined in a regular file, and we are 1509 not generating a shared library, then set the symbol to this 1510 location in the .plt. This is required to make function 1511 pointers compare as equal between the normal executable and 1512 the shared library. */ 1513 if (! info->shared 1514 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 1515 { 1516 h->root.u.def.section = s; 1517 h->root.u.def.value = h->plt.offset; 1518 } 1519 1520 /* Make room for this entry. */ 1521 s->_raw_size += PLT_ENTRY_SIZE; 1522 1523 /* We also need to make an entry in the .got.plt section, which 1524 will be placed in the .got section by the linker script. */ 1525 htab->sgotplt->_raw_size += 4; 1526 1527 /* We also need to make an entry in the .rel.plt section. */ 1528 htab->srelplt->_raw_size += sizeof (Elf32_External_Rel); 1529 } 1530 else 1531 { 1532 h->plt.offset = (bfd_vma) -1; 1533 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 1534 } 1535 } 1536 else 1537 { 1538 h->plt.offset = (bfd_vma) -1; 1539 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; 1540 } 1541 1542 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary, 1543 make it a R_386_TLS_LE_32 requiring no TLS entry. */ 1544 if (h->got.refcount > 0 1545 && !info->shared 1546 && h->dynindx == -1 1547 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE)) 1548 h->got.offset = (bfd_vma) -1; 1549 else if (h->got.refcount > 0) 1550 { 1551 asection *s; 1552 bfd_boolean dyn; 1553 int tls_type = elf_i386_hash_entry(h)->tls_type; 1554 1555 /* Make sure this symbol is output as a dynamic symbol. 1556 Undefined weak syms won't yet be marked as dynamic. */ 1557 if (h->dynindx == -1 1558 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) 1559 { 1560 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1561 return FALSE; 1562 } 1563 1564 s = htab->sgot; 1565 h->got.offset = s->_raw_size; 1566 s->_raw_size += 4; 1567 /* R_386_TLS_GD needs 2 consecutive GOT slots. */ 1568 if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE_BOTH) 1569 s->_raw_size += 4; 1570 dyn = htab->elf.dynamic_sections_created; 1571 /* R_386_TLS_IE_32 needs one dynamic relocation, 1572 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, 1573 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we 1574 need two), R_386_TLS_GD needs one if local symbol and two if 1575 global. */ 1576 if (tls_type == GOT_TLS_IE_BOTH) 1577 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel); 1578 else if ((tls_type == GOT_TLS_GD && h->dynindx == -1) 1579 || (tls_type & GOT_TLS_IE)) 1580 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); 1581 else if (tls_type == GOT_TLS_GD) 1582 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel); 1583 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 1584 || h->root.type != bfd_link_hash_undefweak) 1585 && (info->shared 1586 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) 1587 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); 1588 } 1589 else 1590 h->got.offset = (bfd_vma) -1; 1591 1592 eh = (struct elf_i386_link_hash_entry *) h; 1593 if (eh->dyn_relocs == NULL) 1594 return TRUE; 1595 1596 /* In the shared -Bsymbolic case, discard space allocated for 1597 dynamic pc-relative relocs against symbols which turn out to be 1598 defined in regular objects. For the normal shared case, discard 1599 space for pc-relative relocs that have become local due to symbol 1600 visibility changes. */ 1601 1602 if (info->shared) 1603 { 1604 /* The only reloc that uses pc_count is R_386_PC32, which will 1605 appear on a call or on something like ".long foo - .". We 1606 want calls to protected symbols to resolve directly to the 1607 function rather than going via the plt. If people want 1608 function pointer comparisons to work as expected then they 1609 should avoid writing assembly like ".long foo - .". */ 1610 if (SYMBOL_CALLS_LOCAL (info, h)) 1611 { 1612 struct elf_i386_dyn_relocs **pp; 1613 1614 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 1615 { 1616 p->count -= p->pc_count; 1617 p->pc_count = 0; 1618 if (p->count == 0) 1619 *pp = p->next; 1620 else 1621 pp = &p->next; 1622 } 1623 } 1624 1625 /* Also discard relocs on undefined weak syms with non-default 1626 visibility. */ 1627 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 1628 && h->root.type == bfd_link_hash_undefweak) 1629 eh->dyn_relocs = NULL; 1630 } 1631 else if (ELIMINATE_COPY_RELOCS) 1632 { 1633 /* For the non-shared case, discard space for relocs against 1634 symbols which turn out to need copy relocs or are not 1635 dynamic. */ 1636 1637 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 1638 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 1639 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 1640 || (htab->elf.dynamic_sections_created 1641 && (h->root.type == bfd_link_hash_undefweak 1642 || h->root.type == bfd_link_hash_undefined)))) 1643 { 1644 /* Make sure this symbol is output as a dynamic symbol. 1645 Undefined weak syms won't yet be marked as dynamic. */ 1646 if (h->dynindx == -1 1647 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) 1648 { 1649 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 1650 return FALSE; 1651 } 1652 1653 /* If that succeeded, we know we'll be keeping all the 1654 relocs. */ 1655 if (h->dynindx != -1) 1656 goto keep; 1657 } 1658 1659 eh->dyn_relocs = NULL; 1660 1661 keep: ; 1662 } 1663 1664 /* Finally, allocate space. */ 1665 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1666 { 1667 asection *sreloc = elf_section_data (p->sec)->sreloc; 1668 sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel); 1669 } 1670 1671 return TRUE; 1672} 1673 1674/* Find any dynamic relocs that apply to read-only sections. */ 1675 1676static bfd_boolean 1677readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) 1678{ 1679 struct elf_i386_link_hash_entry *eh; 1680 struct elf_i386_dyn_relocs *p; 1681 1682 if (h->root.type == bfd_link_hash_warning) 1683 h = (struct elf_link_hash_entry *) h->root.u.i.link; 1684 1685 eh = (struct elf_i386_link_hash_entry *) h; 1686 for (p = eh->dyn_relocs; p != NULL; p = p->next) 1687 { 1688 asection *s = p->sec->output_section; 1689 1690 if (s != NULL && (s->flags & SEC_READONLY) != 0) 1691 { 1692 struct bfd_link_info *info = (struct bfd_link_info *) inf; 1693 1694 info->flags |= DF_TEXTREL; 1695 1696 /* Not an error, just cut short the traversal. */ 1697 return FALSE; 1698 } 1699 } 1700 return TRUE; 1701} 1702 1703/* Set the sizes of the dynamic sections. */ 1704 1705static bfd_boolean 1706elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 1707 struct bfd_link_info *info) 1708{ 1709 struct elf_i386_link_hash_table *htab; 1710 bfd *dynobj; 1711 asection *s; 1712 bfd_boolean relocs; 1713 bfd *ibfd; 1714 1715 htab = elf_i386_hash_table (info); 1716 dynobj = htab->elf.dynobj; 1717 if (dynobj == NULL) 1718 abort (); 1719 1720 if (htab->elf.dynamic_sections_created) 1721 { 1722 /* Set the contents of the .interp section to the interpreter. */ 1723 if (info->executable) 1724 { 1725 s = bfd_get_section_by_name (dynobj, ".interp"); 1726 if (s == NULL) 1727 abort (); 1728 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; 1729 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 1730 } 1731 } 1732 1733 /* Set up .got offsets for local syms, and space for local dynamic 1734 relocs. */ 1735 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 1736 { 1737 bfd_signed_vma *local_got; 1738 bfd_signed_vma *end_local_got; 1739 char *local_tls_type; 1740 bfd_size_type locsymcount; 1741 Elf_Internal_Shdr *symtab_hdr; 1742 asection *srel; 1743 1744 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 1745 continue; 1746 1747 for (s = ibfd->sections; s != NULL; s = s->next) 1748 { 1749 struct elf_i386_dyn_relocs *p; 1750 1751 for (p = *((struct elf_i386_dyn_relocs **) 1752 &elf_section_data (s)->local_dynrel); 1753 p != NULL; 1754 p = p->next) 1755 { 1756 if (!bfd_is_abs_section (p->sec) 1757 && bfd_is_abs_section (p->sec->output_section)) 1758 { 1759 /* Input section has been discarded, either because 1760 it is a copy of a linkonce section or due to 1761 linker script /DISCARD/, so we'll be discarding 1762 the relocs too. */ 1763 } 1764 else if (p->count != 0) 1765 { 1766 srel = elf_section_data (p->sec)->sreloc; 1767 srel->_raw_size += p->count * sizeof (Elf32_External_Rel); 1768 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 1769 info->flags |= DF_TEXTREL; 1770 } 1771 } 1772 } 1773 1774 local_got = elf_local_got_refcounts (ibfd); 1775 if (!local_got) 1776 continue; 1777 1778 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 1779 locsymcount = symtab_hdr->sh_info; 1780 end_local_got = local_got + locsymcount; 1781 local_tls_type = elf_i386_local_got_tls_type (ibfd); 1782 s = htab->sgot; 1783 srel = htab->srelgot; 1784 for (; local_got < end_local_got; ++local_got, ++local_tls_type) 1785 { 1786 if (*local_got > 0) 1787 { 1788 *local_got = s->_raw_size; 1789 s->_raw_size += 4; 1790 if (*local_tls_type == GOT_TLS_GD 1791 || *local_tls_type == GOT_TLS_IE_BOTH) 1792 s->_raw_size += 4; 1793 if (info->shared 1794 || *local_tls_type == GOT_TLS_GD 1795 || (*local_tls_type & GOT_TLS_IE)) 1796 { 1797 if (*local_tls_type == GOT_TLS_IE_BOTH) 1798 srel->_raw_size += 2 * sizeof (Elf32_External_Rel); 1799 else 1800 srel->_raw_size += sizeof (Elf32_External_Rel); 1801 } 1802 } 1803 else 1804 *local_got = (bfd_vma) -1; 1805 } 1806 } 1807 1808 if (htab->tls_ldm_got.refcount > 0) 1809 { 1810 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM 1811 relocs. */ 1812 htab->tls_ldm_got.offset = htab->sgot->_raw_size; 1813 htab->sgot->_raw_size += 8; 1814 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); 1815 } 1816 else 1817 htab->tls_ldm_got.offset = -1; 1818 1819 /* Allocate global sym .plt and .got entries, and space for global 1820 sym dynamic relocs. */ 1821 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); 1822 1823 /* We now have determined the sizes of the various dynamic sections. 1824 Allocate memory for them. */ 1825 relocs = FALSE; 1826 for (s = dynobj->sections; s != NULL; s = s->next) 1827 { 1828 if ((s->flags & SEC_LINKER_CREATED) == 0) 1829 continue; 1830 1831 if (s == htab->splt 1832 || s == htab->sgot 1833 || s == htab->sgotplt) 1834 { 1835 /* Strip this section if we don't need it; see the 1836 comment below. */ 1837 } 1838 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0) 1839 { 1840 if (s->_raw_size != 0 && s != htab->srelplt) 1841 relocs = TRUE; 1842 1843 /* We use the reloc_count field as a counter if we need 1844 to copy relocs into the output file. */ 1845 s->reloc_count = 0; 1846 } 1847 else 1848 { 1849 /* It's not one of our sections, so don't allocate space. */ 1850 continue; 1851 } 1852 1853 if (s->_raw_size == 0) 1854 { 1855 /* If we don't need this section, strip it from the 1856 output file. This is mostly to handle .rel.bss and 1857 .rel.plt. We must create both sections in 1858 create_dynamic_sections, because they must be created 1859 before the linker maps input sections to output 1860 sections. The linker does that before 1861 adjust_dynamic_symbol is called, and it is that 1862 function which decides whether anything needs to go 1863 into these sections. */ 1864 1865 _bfd_strip_section_from_output (info, s); 1866 continue; 1867 } 1868 1869 /* Allocate memory for the section contents. We use bfd_zalloc 1870 here in case unused entries are not reclaimed before the 1871 section's contents are written out. This should not happen, 1872 but this way if it does, we get a R_386_NONE reloc instead 1873 of garbage. */ 1874 s->contents = bfd_zalloc (dynobj, s->_raw_size); 1875 if (s->contents == NULL) 1876 return FALSE; 1877 } 1878 1879 if (htab->elf.dynamic_sections_created) 1880 { 1881 /* Add some entries to the .dynamic section. We fill in the 1882 values later, in elf_i386_finish_dynamic_sections, but we 1883 must add the entries now so that we get the correct size for 1884 the .dynamic section. The DT_DEBUG entry is filled in by the 1885 dynamic linker and used by the debugger. */ 1886#define add_dynamic_entry(TAG, VAL) \ 1887 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 1888 1889 if (info->executable) 1890 { 1891 if (!add_dynamic_entry (DT_DEBUG, 0)) 1892 return FALSE; 1893 } 1894 1895 if (htab->splt->_raw_size != 0) 1896 { 1897 if (!add_dynamic_entry (DT_PLTGOT, 0) 1898 || !add_dynamic_entry (DT_PLTRELSZ, 0) 1899 || !add_dynamic_entry (DT_PLTREL, DT_REL) 1900 || !add_dynamic_entry (DT_JMPREL, 0)) 1901 return FALSE; 1902 } 1903 1904 if (relocs) 1905 { 1906 if (!add_dynamic_entry (DT_REL, 0) 1907 || !add_dynamic_entry (DT_RELSZ, 0) 1908 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) 1909 return FALSE; 1910 1911 /* If any dynamic relocs apply to a read-only section, 1912 then we need a DT_TEXTREL entry. */ 1913 if ((info->flags & DF_TEXTREL) == 0) 1914 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, 1915 (PTR) info); 1916 1917 if ((info->flags & DF_TEXTREL) != 0) 1918 { 1919 if (!add_dynamic_entry (DT_TEXTREL, 0)) 1920 return FALSE; 1921 } 1922 } 1923 } 1924#undef add_dynamic_entry 1925 1926 return TRUE; 1927} 1928 1929/* Set the correct type for an x86 ELF section. We do this by the 1930 section name, which is a hack, but ought to work. */ 1931 1932static bfd_boolean 1933elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, 1934 Elf_Internal_Shdr *hdr, 1935 asection *sec) 1936{ 1937 register const char *name; 1938 1939 name = bfd_get_section_name (abfd, sec); 1940 1941 /* This is an ugly, but unfortunately necessary hack that is 1942 needed when producing EFI binaries on x86. It tells 1943 elf.c:elf_fake_sections() not to consider ".reloc" as a section 1944 containing ELF relocation info. We need this hack in order to 1945 be able to generate ELF binaries that can be translated into 1946 EFI applications (which are essentially COFF objects). Those 1947 files contain a COFF ".reloc" section inside an ELFNN object, 1948 which would normally cause BFD to segfault because it would 1949 attempt to interpret this section as containing relocation 1950 entries for section "oc". With this hack enabled, ".reloc" 1951 will be treated as a normal data section, which will avoid the 1952 segfault. However, you won't be able to create an ELFNN binary 1953 with a section named "oc" that needs relocations, but that's 1954 the kind of ugly side-effects you get when detecting section 1955 types based on their names... In practice, this limitation is 1956 unlikely to bite. */ 1957 if (strcmp (name, ".reloc") == 0) 1958 hdr->sh_type = SHT_PROGBITS; 1959 1960 return TRUE; 1961} 1962 1963/* Return the base VMA address which should be subtracted from real addresses 1964 when resolving @dtpoff relocation. 1965 This is PT_TLS segment p_vaddr. */ 1966 1967static bfd_vma 1968dtpoff_base (struct bfd_link_info *info) 1969{ 1970 /* If tls_sec is NULL, we should have signalled an error already. */ 1971 if (elf_hash_table (info)->tls_sec == NULL) 1972 return 0; 1973 return elf_hash_table (info)->tls_sec->vma; 1974} 1975 1976/* Return the relocation value for @tpoff relocation 1977 if STT_TLS virtual address is ADDRESS. */ 1978 1979static bfd_vma 1980tpoff (struct bfd_link_info *info, bfd_vma address) 1981{ 1982 struct elf_link_hash_table *htab = elf_hash_table (info); 1983 1984 /* If tls_sec is NULL, we should have signalled an error already. */ 1985 if (htab->tls_sec == NULL) 1986 return 0; 1987 return htab->tls_size + htab->tls_sec->vma - address; 1988} 1989 1990/* Relocate an i386 ELF section. */ 1991 1992static bfd_boolean 1993elf_i386_relocate_section (bfd *output_bfd, 1994 struct bfd_link_info *info, 1995 bfd *input_bfd, 1996 asection *input_section, 1997 bfd_byte *contents, 1998 Elf_Internal_Rela *relocs, 1999 Elf_Internal_Sym *local_syms, 2000 asection **local_sections) 2001{ 2002 struct elf_i386_link_hash_table *htab; 2003 Elf_Internal_Shdr *symtab_hdr; 2004 struct elf_link_hash_entry **sym_hashes; 2005 bfd_vma *local_got_offsets; 2006 Elf_Internal_Rela *rel; 2007 Elf_Internal_Rela *relend; 2008 2009 htab = elf_i386_hash_table (info); 2010 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 2011 sym_hashes = elf_sym_hashes (input_bfd); 2012 local_got_offsets = elf_local_got_offsets (input_bfd); 2013 2014 rel = relocs; 2015 relend = relocs + input_section->reloc_count; 2016 for (; rel < relend; rel++) 2017 { 2018 unsigned int r_type; 2019 reloc_howto_type *howto; 2020 unsigned long r_symndx; 2021 struct elf_link_hash_entry *h; 2022 Elf_Internal_Sym *sym; 2023 asection *sec; 2024 bfd_vma off; 2025 bfd_vma relocation; 2026 bfd_boolean unresolved_reloc; 2027 bfd_reloc_status_type r; 2028 unsigned int indx; 2029 int tls_type; 2030 2031 r_type = ELF32_R_TYPE (rel->r_info); 2032 if (r_type == R_386_GNU_VTINHERIT 2033 || r_type == R_386_GNU_VTENTRY) 2034 continue; 2035 2036 if ((indx = r_type) >= R_386_standard 2037 && ((indx = r_type - R_386_ext_offset) - R_386_standard 2038 >= R_386_ext - R_386_standard) 2039 && ((indx = r_type - R_386_tls_offset) - R_386_ext 2040 >= R_386_tls - R_386_ext)) 2041 { 2042 bfd_set_error (bfd_error_bad_value); 2043 return FALSE; 2044 } 2045 howto = elf_howto_table + indx; 2046 2047 r_symndx = ELF32_R_SYM (rel->r_info); 2048 2049 if (info->relocatable) 2050 { 2051 bfd_vma val; 2052 bfd_byte *where; 2053 2054 /* This is a relocatable link. We don't have to change 2055 anything, unless the reloc is against a section symbol, 2056 in which case we have to adjust according to where the 2057 section symbol winds up in the output section. */ 2058 if (r_symndx >= symtab_hdr->sh_info) 2059 continue; 2060 2061 sym = local_syms + r_symndx; 2062 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) 2063 continue; 2064 2065 sec = local_sections[r_symndx]; 2066 val = sec->output_offset; 2067 if (val == 0) 2068 continue; 2069 2070 where = contents + rel->r_offset; 2071 switch (howto->size) 2072 { 2073 /* FIXME: overflow checks. */ 2074 case 0: 2075 val += bfd_get_8 (input_bfd, where); 2076 bfd_put_8 (input_bfd, val, where); 2077 break; 2078 case 1: 2079 val += bfd_get_16 (input_bfd, where); 2080 bfd_put_16 (input_bfd, val, where); 2081 break; 2082 case 2: 2083 val += bfd_get_32 (input_bfd, where); 2084 bfd_put_32 (input_bfd, val, where); 2085 break; 2086 default: 2087 abort (); 2088 } 2089 continue; 2090 } 2091 2092 /* This is a final link. */ 2093 h = NULL; 2094 sym = NULL; 2095 sec = NULL; 2096 unresolved_reloc = FALSE; 2097 if (r_symndx < symtab_hdr->sh_info) 2098 { 2099 sym = local_syms + r_symndx; 2100 sec = local_sections[r_symndx]; 2101 relocation = (sec->output_section->vma 2102 + sec->output_offset 2103 + sym->st_value); 2104 if ((sec->flags & SEC_MERGE) 2105 && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 2106 { 2107 asection *msec; 2108 bfd_vma addend; 2109 bfd_byte *where = contents + rel->r_offset; 2110 2111 switch (howto->size) 2112 { 2113 case 0: 2114 addend = bfd_get_8 (input_bfd, where); 2115 if (howto->pc_relative) 2116 { 2117 addend = (addend ^ 0x80) - 0x80; 2118 addend += 1; 2119 } 2120 break; 2121 case 1: 2122 addend = bfd_get_16 (input_bfd, where); 2123 if (howto->pc_relative) 2124 { 2125 addend = (addend ^ 0x8000) - 0x8000; 2126 addend += 2; 2127 } 2128 break; 2129 case 2: 2130 addend = bfd_get_32 (input_bfd, where); 2131 if (howto->pc_relative) 2132 { 2133 addend = (addend ^ 0x80000000) - 0x80000000; 2134 addend += 4; 2135 } 2136 break; 2137 default: 2138 abort (); 2139 } 2140 2141 msec = sec; 2142 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend); 2143 addend -= relocation; 2144 addend += msec->output_section->vma + msec->output_offset; 2145 2146 switch (howto->size) 2147 { 2148 case 0: 2149 /* FIXME: overflow checks. */ 2150 if (howto->pc_relative) 2151 addend -= 1; 2152 bfd_put_8 (input_bfd, addend, where); 2153 break; 2154 case 1: 2155 if (howto->pc_relative) 2156 addend -= 2; 2157 bfd_put_16 (input_bfd, addend, where); 2158 break; 2159 case 2: 2160 if (howto->pc_relative) 2161 addend -= 4; 2162 bfd_put_32 (input_bfd, addend, where); 2163 break; 2164 } 2165 } 2166 } 2167 else 2168 { 2169 bfd_boolean warned; 2170 2171 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 2172 r_symndx, symtab_hdr, sym_hashes, 2173 h, sec, relocation, 2174 unresolved_reloc, warned); 2175 } 2176 2177 switch (r_type) 2178 { 2179 case R_386_GOT32: 2180 /* Relocation is to the entry for this symbol in the global 2181 offset table. */ 2182 if (htab->sgot == NULL) 2183 abort (); 2184 2185 if (h != NULL) 2186 { 2187 bfd_boolean dyn; 2188 2189 off = h->got.offset; 2190 dyn = htab->elf.dynamic_sections_created; 2191 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) 2192 || (info->shared 2193 && SYMBOL_REFERENCES_LOCAL (info, h)) 2194 || (ELF_ST_VISIBILITY (h->other) 2195 && h->root.type == bfd_link_hash_undefweak)) 2196 { 2197 /* This is actually a static link, or it is a 2198 -Bsymbolic link and the symbol is defined 2199 locally, or the symbol was forced to be local 2200 because of a version file. We must initialize 2201 this entry in the global offset table. Since the 2202 offset must always be a multiple of 4, we use the 2203 least significant bit to record whether we have 2204 initialized it already. 2205 2206 When doing a dynamic link, we create a .rel.got 2207 relocation entry to initialize the value. This 2208 is done in the finish_dynamic_symbol routine. */ 2209 if ((off & 1) != 0) 2210 off &= ~1; 2211 else 2212 { 2213 bfd_put_32 (output_bfd, relocation, 2214 htab->sgot->contents + off); 2215 h->got.offset |= 1; 2216 } 2217 } 2218 else 2219 unresolved_reloc = FALSE; 2220 } 2221 else 2222 { 2223 if (local_got_offsets == NULL) 2224 abort (); 2225 2226 off = local_got_offsets[r_symndx]; 2227 2228 /* The offset must always be a multiple of 4. We use 2229 the least significant bit to record whether we have 2230 already generated the necessary reloc. */ 2231 if ((off & 1) != 0) 2232 off &= ~1; 2233 else 2234 { 2235 bfd_put_32 (output_bfd, relocation, 2236 htab->sgot->contents + off); 2237 2238 if (info->shared) 2239 { 2240 asection *s; 2241 Elf_Internal_Rela outrel; 2242 bfd_byte *loc; 2243 2244 s = htab->srelgot; 2245 if (s == NULL) 2246 abort (); 2247 2248 outrel.r_offset = (htab->sgot->output_section->vma 2249 + htab->sgot->output_offset 2250 + off); 2251 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2252 loc = s->contents; 2253 loc += s->reloc_count++ * sizeof (Elf32_External_Rel); 2254 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2255 } 2256 2257 local_got_offsets[r_symndx] |= 1; 2258 } 2259 } 2260 2261 if (off >= (bfd_vma) -2) 2262 abort (); 2263 2264 relocation = htab->sgot->output_offset + off; 2265 break; 2266 2267 case R_386_GOTOFF: 2268 /* Relocation is relative to the start of the global offset 2269 table. */ 2270 2271 /* Note that sgot->output_offset is not involved in this 2272 calculation. We always want the start of .got. If we 2273 defined _GLOBAL_OFFSET_TABLE in a different way, as is 2274 permitted by the ABI, we might have to change this 2275 calculation. */ 2276 relocation -= htab->sgot->output_section->vma; 2277 break; 2278 2279 case R_386_GOTPC: 2280 /* Use global offset table as symbol value. */ 2281 relocation = htab->sgot->output_section->vma; 2282 unresolved_reloc = FALSE; 2283 break; 2284 2285 case R_386_PLT32: 2286 /* Relocation is to the entry for this symbol in the 2287 procedure linkage table. */ 2288 2289 /* Resolve a PLT32 reloc against a local symbol directly, 2290 without using the procedure linkage table. */ 2291 if (h == NULL) 2292 break; 2293 2294 if (h->plt.offset == (bfd_vma) -1 2295 || htab->splt == NULL) 2296 { 2297 /* We didn't make a PLT entry for this symbol. This 2298 happens when statically linking PIC code, or when 2299 using -Bsymbolic. */ 2300 break; 2301 } 2302 2303 relocation = (htab->splt->output_section->vma 2304 + htab->splt->output_offset 2305 + h->plt.offset); 2306 unresolved_reloc = FALSE; 2307 break; 2308 2309 case R_386_32: 2310 case R_386_PC32: 2311 /* r_symndx will be zero only for relocs against symbols 2312 from removed linkonce sections, or sections discarded by 2313 a linker script. */ 2314 if (r_symndx == 0 2315 || (input_section->flags & SEC_ALLOC) == 0) 2316 break; 2317 2318 if ((info->shared 2319 && (h == NULL 2320 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 2321 || h->root.type != bfd_link_hash_undefweak) 2322 && (r_type != R_386_PC32 2323 || !SYMBOL_CALLS_LOCAL (info, h))) 2324 || (ELIMINATE_COPY_RELOCS 2325 && !info->shared 2326 && h != NULL 2327 && h->dynindx != -1 2328 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 2329 && (((h->elf_link_hash_flags 2330 & ELF_LINK_HASH_DEF_DYNAMIC) != 0 2331 && (h->elf_link_hash_flags 2332 & ELF_LINK_HASH_DEF_REGULAR) == 0) 2333 || h->root.type == bfd_link_hash_undefweak 2334 || h->root.type == bfd_link_hash_undefined))) 2335 { 2336 Elf_Internal_Rela outrel; 2337 bfd_byte *loc; 2338 bfd_boolean skip, relocate; 2339 asection *sreloc; 2340 2341 /* When generating a shared object, these relocations 2342 are copied into the output file to be resolved at run 2343 time. */ 2344 2345 skip = FALSE; 2346 relocate = FALSE; 2347 2348 outrel.r_offset = 2349 _bfd_elf_section_offset (output_bfd, info, input_section, 2350 rel->r_offset); 2351 if (outrel.r_offset == (bfd_vma) -1) 2352 skip = TRUE; 2353 else if (outrel.r_offset == (bfd_vma) -2) 2354 skip = TRUE, relocate = TRUE; 2355 outrel.r_offset += (input_section->output_section->vma 2356 + input_section->output_offset); 2357 2358 if (skip) 2359 memset (&outrel, 0, sizeof outrel); 2360 else if (h != NULL 2361 && h->dynindx != -1 2362 && (r_type == R_386_PC32 2363 || !info->shared 2364 || !info->symbolic 2365 || (h->elf_link_hash_flags 2366 & ELF_LINK_HASH_DEF_REGULAR) == 0)) 2367 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); 2368 else 2369 { 2370 /* This symbol is local, or marked to become local. */ 2371 relocate = TRUE; 2372 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2373 } 2374 2375 sreloc = elf_section_data (input_section)->sreloc; 2376 if (sreloc == NULL) 2377 abort (); 2378 2379 loc = sreloc->contents; 2380 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 2381 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2382 2383 /* If this reloc is against an external symbol, we do 2384 not want to fiddle with the addend. Otherwise, we 2385 need to include the symbol value so that it becomes 2386 an addend for the dynamic reloc. */ 2387 if (! relocate) 2388 continue; 2389 } 2390 break; 2391 2392 case R_386_TLS_IE: 2393 if (info->shared) 2394 { 2395 Elf_Internal_Rela outrel; 2396 bfd_byte *loc; 2397 asection *sreloc; 2398 2399 outrel.r_offset = rel->r_offset 2400 + input_section->output_section->vma 2401 + input_section->output_offset; 2402 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 2403 sreloc = elf_section_data (input_section)->sreloc; 2404 if (sreloc == NULL) 2405 abort (); 2406 loc = sreloc->contents; 2407 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 2408 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2409 } 2410 /* Fall through */ 2411 2412 case R_386_TLS_GD: 2413 case R_386_TLS_IE_32: 2414 case R_386_TLS_GOTIE: 2415 r_type = elf_i386_tls_transition (info, r_type, h == NULL); 2416 tls_type = GOT_UNKNOWN; 2417 if (h == NULL && local_got_offsets) 2418 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx]; 2419 else if (h != NULL) 2420 { 2421 tls_type = elf_i386_hash_entry(h)->tls_type; 2422 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE)) 2423 r_type = R_386_TLS_LE_32; 2424 } 2425 if (tls_type == GOT_TLS_IE) 2426 tls_type = GOT_TLS_IE_NEG; 2427 if (r_type == R_386_TLS_GD) 2428 { 2429 if (tls_type == GOT_TLS_IE_POS) 2430 r_type = R_386_TLS_GOTIE; 2431 else if (tls_type & GOT_TLS_IE) 2432 r_type = R_386_TLS_IE_32; 2433 } 2434 2435 if (r_type == R_386_TLS_LE_32) 2436 { 2437 BFD_ASSERT (! unresolved_reloc); 2438 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) 2439 { 2440 unsigned int val, type; 2441 bfd_vma roff; 2442 2443 /* GD->LE transition. */ 2444 BFD_ASSERT (rel->r_offset >= 2); 2445 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 2446 BFD_ASSERT (type == 0x8d || type == 0x04); 2447 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size); 2448 BFD_ASSERT (bfd_get_8 (input_bfd, 2449 contents + rel->r_offset + 4) 2450 == 0xe8); 2451 BFD_ASSERT (rel + 1 < relend); 2452 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 2453 roff = rel->r_offset + 5; 2454 val = bfd_get_8 (input_bfd, 2455 contents + rel->r_offset - 1); 2456 if (type == 0x04) 2457 { 2458 /* leal foo(,%reg,1), %eax; call ___tls_get_addr 2459 Change it into: 2460 movl %gs:0, %eax; subl $foo@tpoff, %eax 2461 (6 byte form of subl). */ 2462 BFD_ASSERT (rel->r_offset >= 3); 2463 BFD_ASSERT (bfd_get_8 (input_bfd, 2464 contents + rel->r_offset - 3) 2465 == 0x8d); 2466 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); 2467 memcpy (contents + rel->r_offset - 3, 2468 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); 2469 } 2470 else 2471 { 2472 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); 2473 if (rel->r_offset + 10 <= input_section->_raw_size 2474 && bfd_get_8 (input_bfd, 2475 contents + rel->r_offset + 9) == 0x90) 2476 { 2477 /* leal foo(%reg), %eax; call ___tls_get_addr; nop 2478 Change it into: 2479 movl %gs:0, %eax; subl $foo@tpoff, %eax 2480 (6 byte form of subl). */ 2481 memcpy (contents + rel->r_offset - 2, 2482 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); 2483 roff = rel->r_offset + 6; 2484 } 2485 else 2486 { 2487 /* leal foo(%reg), %eax; call ___tls_get_addr 2488 Change it into: 2489 movl %gs:0, %eax; subl $foo@tpoff, %eax 2490 (5 byte form of subl). */ 2491 memcpy (contents + rel->r_offset - 2, 2492 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); 2493 } 2494 } 2495 bfd_put_32 (output_bfd, tpoff (info, relocation), 2496 contents + roff); 2497 /* Skip R_386_PLT32. */ 2498 rel++; 2499 continue; 2500 } 2501 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE) 2502 { 2503 unsigned int val, type; 2504 2505 /* IE->LE transition: 2506 Originally it can be one of: 2507 movl foo, %eax 2508 movl foo, %reg 2509 addl foo, %reg 2510 We change it into: 2511 movl $foo, %eax 2512 movl $foo, %reg 2513 addl $foo, %reg. */ 2514 BFD_ASSERT (rel->r_offset >= 1); 2515 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2516 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size); 2517 if (val == 0xa1) 2518 { 2519 /* movl foo, %eax. */ 2520 bfd_put_8 (output_bfd, 0xb8, 2521 contents + rel->r_offset - 1); 2522 } 2523 else 2524 { 2525 BFD_ASSERT (rel->r_offset >= 2); 2526 type = bfd_get_8 (input_bfd, 2527 contents + rel->r_offset - 2); 2528 switch (type) 2529 { 2530 case 0x8b: 2531 /* movl */ 2532 BFD_ASSERT ((val & 0xc7) == 0x05); 2533 bfd_put_8 (output_bfd, 0xc7, 2534 contents + rel->r_offset - 2); 2535 bfd_put_8 (output_bfd, 2536 0xc0 | ((val >> 3) & 7), 2537 contents + rel->r_offset - 1); 2538 break; 2539 case 0x03: 2540 /* addl */ 2541 BFD_ASSERT ((val & 0xc7) == 0x05); 2542 bfd_put_8 (output_bfd, 0x81, 2543 contents + rel->r_offset - 2); 2544 bfd_put_8 (output_bfd, 2545 0xc0 | ((val >> 3) & 7), 2546 contents + rel->r_offset - 1); 2547 break; 2548 default: 2549 BFD_FAIL (); 2550 break; 2551 } 2552 } 2553 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2554 contents + rel->r_offset); 2555 continue; 2556 } 2557 else 2558 { 2559 unsigned int val, type; 2560 2561 /* {IE_32,GOTIE}->LE transition: 2562 Originally it can be one of: 2563 subl foo(%reg1), %reg2 2564 movl foo(%reg1), %reg2 2565 addl foo(%reg1), %reg2 2566 We change it into: 2567 subl $foo, %reg2 2568 movl $foo, %reg2 (6 byte form) 2569 addl $foo, %reg2. */ 2570 BFD_ASSERT (rel->r_offset >= 2); 2571 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 2572 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2573 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size); 2574 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4); 2575 if (type == 0x8b) 2576 { 2577 /* movl */ 2578 bfd_put_8 (output_bfd, 0xc7, 2579 contents + rel->r_offset - 2); 2580 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 2581 contents + rel->r_offset - 1); 2582 } 2583 else if (type == 0x2b) 2584 { 2585 /* subl */ 2586 bfd_put_8 (output_bfd, 0x81, 2587 contents + rel->r_offset - 2); 2588 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), 2589 contents + rel->r_offset - 1); 2590 } 2591 else if (type == 0x03) 2592 { 2593 /* addl */ 2594 bfd_put_8 (output_bfd, 0x81, 2595 contents + rel->r_offset - 2); 2596 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), 2597 contents + rel->r_offset - 1); 2598 } 2599 else 2600 BFD_FAIL (); 2601 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE) 2602 bfd_put_32 (output_bfd, -tpoff (info, relocation), 2603 contents + rel->r_offset); 2604 else 2605 bfd_put_32 (output_bfd, tpoff (info, relocation), 2606 contents + rel->r_offset); 2607 continue; 2608 } 2609 } 2610 2611 if (htab->sgot == NULL) 2612 abort (); 2613 2614 if (h != NULL) 2615 off = h->got.offset; 2616 else 2617 { 2618 if (local_got_offsets == NULL) 2619 abort (); 2620 2621 off = local_got_offsets[r_symndx]; 2622 } 2623 2624 if ((off & 1) != 0) 2625 off &= ~1; 2626 else 2627 { 2628 Elf_Internal_Rela outrel; 2629 bfd_byte *loc; 2630 int dr_type, indx; 2631 2632 if (htab->srelgot == NULL) 2633 abort (); 2634 2635 outrel.r_offset = (htab->sgot->output_section->vma 2636 + htab->sgot->output_offset + off); 2637 2638 indx = h && h->dynindx != -1 ? h->dynindx : 0; 2639 if (r_type == R_386_TLS_GD) 2640 dr_type = R_386_TLS_DTPMOD32; 2641 else if (tls_type == GOT_TLS_IE_POS) 2642 dr_type = R_386_TLS_TPOFF; 2643 else 2644 dr_type = R_386_TLS_TPOFF32; 2645 if (dr_type == R_386_TLS_TPOFF && indx == 0) 2646 bfd_put_32 (output_bfd, relocation - dtpoff_base (info), 2647 htab->sgot->contents + off); 2648 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) 2649 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation, 2650 htab->sgot->contents + off); 2651 else 2652 bfd_put_32 (output_bfd, 0, 2653 htab->sgot->contents + off); 2654 outrel.r_info = ELF32_R_INFO (indx, dr_type); 2655 loc = htab->srelgot->contents; 2656 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); 2657 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2658 2659 if (r_type == R_386_TLS_GD) 2660 { 2661 if (indx == 0) 2662 { 2663 BFD_ASSERT (! unresolved_reloc); 2664 bfd_put_32 (output_bfd, 2665 relocation - dtpoff_base (info), 2666 htab->sgot->contents + off + 4); 2667 } 2668 else 2669 { 2670 bfd_put_32 (output_bfd, 0, 2671 htab->sgot->contents + off + 4); 2672 outrel.r_info = ELF32_R_INFO (indx, 2673 R_386_TLS_DTPOFF32); 2674 outrel.r_offset += 4; 2675 htab->srelgot->reloc_count++; 2676 loc += sizeof (Elf32_External_Rel); 2677 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2678 } 2679 } 2680 else if (tls_type == GOT_TLS_IE_BOTH) 2681 { 2682 bfd_put_32 (output_bfd, 2683 indx == 0 ? relocation - dtpoff_base (info) : 0, 2684 htab->sgot->contents + off + 4); 2685 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 2686 outrel.r_offset += 4; 2687 htab->srelgot->reloc_count++; 2688 loc += sizeof (Elf32_External_Rel); 2689 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2690 } 2691 2692 if (h != NULL) 2693 h->got.offset |= 1; 2694 else 2695 local_got_offsets[r_symndx] |= 1; 2696 } 2697 2698 if (off >= (bfd_vma) -2) 2699 abort (); 2700 if (r_type == ELF32_R_TYPE (rel->r_info)) 2701 { 2702 relocation = htab->sgot->output_offset + off; 2703 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) 2704 && tls_type == GOT_TLS_IE_BOTH) 2705 relocation += 4; 2706 if (r_type == R_386_TLS_IE) 2707 relocation += htab->sgot->output_section->vma; 2708 unresolved_reloc = FALSE; 2709 } 2710 else 2711 { 2712 unsigned int val, type; 2713 bfd_vma roff; 2714 2715 /* GD->IE transition. */ 2716 BFD_ASSERT (rel->r_offset >= 2); 2717 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); 2718 BFD_ASSERT (type == 0x8d || type == 0x04); 2719 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size); 2720 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) 2721 == 0xe8); 2722 BFD_ASSERT (rel + 1 < relend); 2723 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 2724 roff = rel->r_offset - 3; 2725 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2726 if (type == 0x04) 2727 { 2728 /* leal foo(,%reg,1), %eax; call ___tls_get_addr 2729 Change it into: 2730 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ 2731 BFD_ASSERT (rel->r_offset >= 3); 2732 BFD_ASSERT (bfd_get_8 (input_bfd, 2733 contents + rel->r_offset - 3) 2734 == 0x8d); 2735 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); 2736 val >>= 3; 2737 } 2738 else 2739 { 2740 /* leal foo(%reg), %eax; call ___tls_get_addr; nop 2741 Change it into: 2742 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ 2743 BFD_ASSERT (rel->r_offset + 10 <= input_section->_raw_size); 2744 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); 2745 BFD_ASSERT (bfd_get_8 (input_bfd, 2746 contents + rel->r_offset + 9) 2747 == 0x90); 2748 roff = rel->r_offset - 2; 2749 } 2750 memcpy (contents + roff, 2751 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); 2752 contents[roff + 7] = 0x80 | (val & 7); 2753 /* If foo is used only with foo@gotntpoff(%reg) and 2754 foo@indntpoff, but not with foo@gottpoff(%reg), change 2755 subl $foo@gottpoff(%reg), %eax 2756 into: 2757 addl $foo@gotntpoff(%reg), %eax. */ 2758 if (r_type == R_386_TLS_GOTIE) 2759 { 2760 contents[roff + 6] = 0x03; 2761 if (tls_type == GOT_TLS_IE_BOTH) 2762 off += 4; 2763 } 2764 bfd_put_32 (output_bfd, htab->sgot->output_offset + off, 2765 contents + roff + 8); 2766 /* Skip R_386_PLT32. */ 2767 rel++; 2768 continue; 2769 } 2770 break; 2771 2772 case R_386_TLS_LDM: 2773 if (! info->shared) 2774 { 2775 unsigned int val; 2776 2777 /* LD->LE transition: 2778 Ensure it is: 2779 leal foo(%reg), %eax; call ___tls_get_addr. 2780 We change it into: 2781 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */ 2782 BFD_ASSERT (rel->r_offset >= 2); 2783 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2) 2784 == 0x8d); 2785 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); 2786 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); 2787 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size); 2788 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) 2789 == 0xe8); 2790 BFD_ASSERT (rel + 1 < relend); 2791 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); 2792 memcpy (contents + rel->r_offset - 2, 2793 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); 2794 /* Skip R_386_PLT32. */ 2795 rel++; 2796 continue; 2797 } 2798 2799 if (htab->sgot == NULL) 2800 abort (); 2801 2802 off = htab->tls_ldm_got.offset; 2803 if (off & 1) 2804 off &= ~1; 2805 else 2806 { 2807 Elf_Internal_Rela outrel; 2808 bfd_byte *loc; 2809 2810 if (htab->srelgot == NULL) 2811 abort (); 2812 2813 outrel.r_offset = (htab->sgot->output_section->vma 2814 + htab->sgot->output_offset + off); 2815 2816 bfd_put_32 (output_bfd, 0, 2817 htab->sgot->contents + off); 2818 bfd_put_32 (output_bfd, 0, 2819 htab->sgot->contents + off + 4); 2820 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); 2821 loc = htab->srelgot->contents; 2822 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); 2823 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2824 htab->tls_ldm_got.offset |= 1; 2825 } 2826 relocation = htab->sgot->output_offset + off; 2827 unresolved_reloc = FALSE; 2828 break; 2829 2830 case R_386_TLS_LDO_32: 2831 if (info->shared || (input_section->flags & SEC_CODE) == 0) 2832 relocation -= dtpoff_base (info); 2833 else 2834 /* When converting LDO to LE, we must negate. */ 2835 relocation = -tpoff (info, relocation); 2836 break; 2837 2838 case R_386_TLS_LE_32: 2839 case R_386_TLS_LE: 2840 if (info->shared) 2841 { 2842 Elf_Internal_Rela outrel; 2843 asection *sreloc; 2844 bfd_byte *loc; 2845 int indx; 2846 2847 outrel.r_offset = rel->r_offset 2848 + input_section->output_section->vma 2849 + input_section->output_offset; 2850 if (h != NULL && h->dynindx != -1) 2851 indx = h->dynindx; 2852 else 2853 indx = 0; 2854 if (r_type == R_386_TLS_LE_32) 2855 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); 2856 else 2857 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); 2858 sreloc = elf_section_data (input_section)->sreloc; 2859 if (sreloc == NULL) 2860 abort (); 2861 loc = sreloc->contents; 2862 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); 2863 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); 2864 if (indx) 2865 continue; 2866 else if (r_type == R_386_TLS_LE_32) 2867 relocation = dtpoff_base (info) - relocation; 2868 else 2869 relocation -= dtpoff_base (info); 2870 } 2871 else if (r_type == R_386_TLS_LE_32) 2872 relocation = tpoff (info, relocation); 2873 else 2874 relocation = -tpoff (info, relocation); 2875 break; 2876 2877 default: 2878 break; 2879 } 2880 2881 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 2882 because such sections are not SEC_ALLOC and thus ld.so will 2883 not process them. */ 2884 if (unresolved_reloc 2885 && !((input_section->flags & SEC_DEBUGGING) != 0 2886 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) 2887 { 2888 (*_bfd_error_handler) 2889 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), 2890 bfd_archive_filename (input_bfd), 2891 bfd_get_section_name (input_bfd, input_section), 2892 (long) rel->r_offset, 2893 h->root.root.string); 2894 return FALSE; 2895 } 2896 2897 r = _bfd_final_link_relocate (howto, input_bfd, input_section, 2898 contents, rel->r_offset, 2899 relocation, 0); 2900 2901 if (r != bfd_reloc_ok) 2902 { 2903 const char *name; 2904 2905 if (h != NULL) 2906 name = h->root.root.string; 2907 else 2908 { 2909 name = bfd_elf_string_from_elf_section (input_bfd, 2910 symtab_hdr->sh_link, 2911 sym->st_name); 2912 if (name == NULL) 2913 return FALSE; 2914 if (*name == '\0') 2915 name = bfd_section_name (input_bfd, sec); 2916 } 2917 2918 if (r == bfd_reloc_overflow) 2919 { 2920 if (! ((*info->callbacks->reloc_overflow) 2921 (info, name, howto->name, 0, 2922 input_bfd, input_section, rel->r_offset))) 2923 return FALSE; 2924 } 2925 else 2926 { 2927 (*_bfd_error_handler) 2928 (_("%s(%s+0x%lx): reloc against `%s': error %d"), 2929 bfd_archive_filename (input_bfd), 2930 bfd_get_section_name (input_bfd, input_section), 2931 (long) rel->r_offset, name, (int) r); 2932 return FALSE; 2933 } 2934 } 2935 } 2936 2937 return TRUE; 2938} 2939 2940/* Finish up dynamic symbol handling. We set the contents of various 2941 dynamic sections here. */ 2942 2943static bfd_boolean 2944elf_i386_finish_dynamic_symbol (bfd *output_bfd, 2945 struct bfd_link_info *info, 2946 struct elf_link_hash_entry *h, 2947 Elf_Internal_Sym *sym) 2948{ 2949 struct elf_i386_link_hash_table *htab; 2950 2951 htab = elf_i386_hash_table (info); 2952 2953 if (h->plt.offset != (bfd_vma) -1) 2954 { 2955 bfd_vma plt_index; 2956 bfd_vma got_offset; 2957 Elf_Internal_Rela rel; 2958 bfd_byte *loc; 2959 2960 /* This symbol has an entry in the procedure linkage table. Set 2961 it up. */ 2962 2963 if (h->dynindx == -1 2964 || htab->splt == NULL 2965 || htab->sgotplt == NULL 2966 || htab->srelplt == NULL) 2967 abort (); 2968 2969 /* Get the index in the procedure linkage table which 2970 corresponds to this symbol. This is the index of this symbol 2971 in all the symbols for which we are making plt entries. The 2972 first entry in the procedure linkage table is reserved. */ 2973 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; 2974 2975 /* Get the offset into the .got table of the entry that 2976 corresponds to this function. Each .got entry is 4 bytes. 2977 The first three are reserved. */ 2978 got_offset = (plt_index + 3) * 4; 2979 2980 /* Fill in the entry in the procedure linkage table. */ 2981 if (! info->shared) 2982 { 2983 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry, 2984 PLT_ENTRY_SIZE); 2985 bfd_put_32 (output_bfd, 2986 (htab->sgotplt->output_section->vma 2987 + htab->sgotplt->output_offset 2988 + got_offset), 2989 htab->splt->contents + h->plt.offset + 2); 2990 } 2991 else 2992 { 2993 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry, 2994 PLT_ENTRY_SIZE); 2995 bfd_put_32 (output_bfd, got_offset, 2996 htab->splt->contents + h->plt.offset + 2); 2997 } 2998 2999 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), 3000 htab->splt->contents + h->plt.offset + 7); 3001 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), 3002 htab->splt->contents + h->plt.offset + 12); 3003 3004 /* Fill in the entry in the global offset table. */ 3005 bfd_put_32 (output_bfd, 3006 (htab->splt->output_section->vma 3007 + htab->splt->output_offset 3008 + h->plt.offset 3009 + 6), 3010 htab->sgotplt->contents + got_offset); 3011 3012 /* Fill in the entry in the .rel.plt section. */ 3013 rel.r_offset = (htab->sgotplt->output_section->vma 3014 + htab->sgotplt->output_offset 3015 + got_offset); 3016 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); 3017 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel); 3018 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3019 3020 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) 3021 { 3022 /* Mark the symbol as undefined, rather than as defined in 3023 the .plt section. Leave the value if there were any 3024 relocations where pointer equality matters (this is a clue 3025 for the dynamic linker, to make function pointer 3026 comparisons work between an application and shared 3027 library), otherwise set it to zero. If a function is only 3028 called from a binary, there is no need to slow down 3029 shared libraries because of that. */ 3030 sym->st_shndx = SHN_UNDEF; 3031 if ((h->elf_link_hash_flags & ELF_LINK_POINTER_EQUALITY_NEEDED) == 0) 3032 sym->st_value = 0; 3033 } 3034 } 3035 3036 if (h->got.offset != (bfd_vma) -1 3037 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD 3038 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0) 3039 { 3040 Elf_Internal_Rela rel; 3041 bfd_byte *loc; 3042 3043 /* This symbol has an entry in the global offset table. Set it 3044 up. */ 3045 3046 if (htab->sgot == NULL || htab->srelgot == NULL) 3047 abort (); 3048 3049 rel.r_offset = (htab->sgot->output_section->vma 3050 + htab->sgot->output_offset 3051 + (h->got.offset & ~(bfd_vma) 1)); 3052 3053 /* If this is a static link, or it is a -Bsymbolic link and the 3054 symbol is defined locally or was forced to be local because 3055 of a version file, we just want to emit a RELATIVE reloc. 3056 The entry in the global offset table will already have been 3057 initialized in the relocate_section function. */ 3058 if (info->shared 3059 && SYMBOL_REFERENCES_LOCAL (info, h)) 3060 { 3061 BFD_ASSERT((h->got.offset & 1) != 0); 3062 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); 3063 } 3064 else 3065 { 3066 BFD_ASSERT((h->got.offset & 1) == 0); 3067 bfd_put_32 (output_bfd, (bfd_vma) 0, 3068 htab->sgot->contents + h->got.offset); 3069 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); 3070 } 3071 3072 loc = htab->srelgot->contents; 3073 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); 3074 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3075 } 3076 3077 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) 3078 { 3079 Elf_Internal_Rela rel; 3080 bfd_byte *loc; 3081 3082 /* This symbol needs a copy reloc. Set it up. */ 3083 3084 if (h->dynindx == -1 3085 || (h->root.type != bfd_link_hash_defined 3086 && h->root.type != bfd_link_hash_defweak) 3087 || htab->srelbss == NULL) 3088 abort (); 3089 3090 rel.r_offset = (h->root.u.def.value 3091 + h->root.u.def.section->output_section->vma 3092 + h->root.u.def.section->output_offset); 3093 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); 3094 loc = htab->srelbss->contents; 3095 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel); 3096 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); 3097 } 3098 3099 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ 3100 if (strcmp (h->root.root.string, "_DYNAMIC") == 0 3101 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) 3102 sym->st_shndx = SHN_ABS; 3103 3104 return TRUE; 3105} 3106 3107/* Used to decide how to sort relocs in an optimal manner for the 3108 dynamic linker, before writing them out. */ 3109 3110static enum elf_reloc_type_class 3111elf_i386_reloc_type_class (const Elf_Internal_Rela *rela) 3112{ 3113 switch (ELF32_R_TYPE (rela->r_info)) 3114 { 3115 case R_386_RELATIVE: 3116 return reloc_class_relative; 3117 case R_386_JUMP_SLOT: 3118 return reloc_class_plt; 3119 case R_386_COPY: 3120 return reloc_class_copy; 3121 default: 3122 return reloc_class_normal; 3123 } 3124} 3125 3126/* Finish up the dynamic sections. */ 3127 3128static bfd_boolean 3129elf_i386_finish_dynamic_sections (bfd *output_bfd, 3130 struct bfd_link_info *info) 3131{ 3132 struct elf_i386_link_hash_table *htab; 3133 bfd *dynobj; 3134 asection *sdyn; 3135 3136 htab = elf_i386_hash_table (info); 3137 dynobj = htab->elf.dynobj; 3138 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 3139 3140 if (htab->elf.dynamic_sections_created) 3141 { 3142 Elf32_External_Dyn *dyncon, *dynconend; 3143 3144 if (sdyn == NULL || htab->sgot == NULL) 3145 abort (); 3146 3147 dyncon = (Elf32_External_Dyn *) sdyn->contents; 3148 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); 3149 for (; dyncon < dynconend; dyncon++) 3150 { 3151 Elf_Internal_Dyn dyn; 3152 asection *s; 3153 3154 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); 3155 3156 switch (dyn.d_tag) 3157 { 3158 default: 3159 continue; 3160 3161 case DT_PLTGOT: 3162 dyn.d_un.d_ptr = htab->sgot->output_section->vma; 3163 break; 3164 3165 case DT_JMPREL: 3166 s = htab->srelplt; 3167 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 3168 break; 3169 3170 case DT_PLTRELSZ: 3171 s = htab->srelplt; 3172 dyn.d_un.d_val = s->_raw_size; 3173 break; 3174 3175 case DT_RELSZ: 3176 /* My reading of the SVR4 ABI indicates that the 3177 procedure linkage table relocs (DT_JMPREL) should be 3178 included in the overall relocs (DT_REL). This is 3179 what Solaris does. However, UnixWare can not handle 3180 that case. Therefore, we override the DT_RELSZ entry 3181 here to make it not include the JMPREL relocs. */ 3182 s = htab->srelplt; 3183 if (s == NULL) 3184 continue; 3185 dyn.d_un.d_val -= s->_raw_size; 3186 break; 3187 3188 case DT_REL: 3189 /* We may not be using the standard ELF linker script. 3190 If .rel.plt is the first .rel section, we adjust 3191 DT_REL to not include it. */ 3192 s = htab->srelplt; 3193 if (s == NULL) 3194 continue; 3195 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) 3196 continue; 3197 dyn.d_un.d_ptr += s->_raw_size; 3198 break; 3199 } 3200 3201 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); 3202 } 3203 3204 /* Fill in the first entry in the procedure linkage table. */ 3205 if (htab->splt && htab->splt->_raw_size > 0) 3206 { 3207 if (info->shared) 3208 memcpy (htab->splt->contents, 3209 elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); 3210 else 3211 { 3212 memcpy (htab->splt->contents, 3213 elf_i386_plt0_entry, PLT_ENTRY_SIZE); 3214 bfd_put_32 (output_bfd, 3215 (htab->sgotplt->output_section->vma 3216 + htab->sgotplt->output_offset 3217 + 4), 3218 htab->splt->contents + 2); 3219 bfd_put_32 (output_bfd, 3220 (htab->sgotplt->output_section->vma 3221 + htab->sgotplt->output_offset 3222 + 8), 3223 htab->splt->contents + 8); 3224 } 3225 3226 /* UnixWare sets the entsize of .plt to 4, although that doesn't 3227 really seem like the right value. */ 3228 elf_section_data (htab->splt->output_section) 3229 ->this_hdr.sh_entsize = 4; 3230 } 3231 } 3232 3233 if (htab->sgotplt) 3234 { 3235 /* Fill in the first three entries in the global offset table. */ 3236 if (htab->sgotplt->_raw_size > 0) 3237 { 3238 bfd_put_32 (output_bfd, 3239 (sdyn == NULL ? 0 3240 : sdyn->output_section->vma + sdyn->output_offset), 3241 htab->sgotplt->contents); 3242 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4); 3243 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8); 3244 } 3245 3246 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4; 3247 } 3248 return TRUE; 3249} 3250 3251#define TARGET_LITTLE_SYM bfd_elf32_i386_vec 3252#define TARGET_LITTLE_NAME "elf32-i386" 3253#define ELF_ARCH bfd_arch_i386 3254#define ELF_MACHINE_CODE EM_386 3255#define ELF_MAXPAGESIZE 0x1000 3256 3257#define elf_backend_can_gc_sections 1 3258#define elf_backend_can_refcount 1 3259#define elf_backend_want_got_plt 1 3260#define elf_backend_plt_readonly 1 3261#define elf_backend_want_plt_sym 0 3262#define elf_backend_got_header_size 12 3263 3264/* Support RELA for objdump of prelink objects. */ 3265#define elf_info_to_howto elf_i386_info_to_howto_rel 3266#define elf_info_to_howto_rel elf_i386_info_to_howto_rel 3267 3268#define bfd_elf32_mkobject elf_i386_mkobject 3269 3270#define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name 3271#define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create 3272#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup 3273 3274#define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol 3275#define elf_backend_check_relocs elf_i386_check_relocs 3276#define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol 3277#define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections 3278#define elf_backend_fake_sections elf_i386_fake_sections 3279#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections 3280#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol 3281#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook 3282#define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook 3283#define elf_backend_grok_prstatus elf_i386_grok_prstatus 3284#define elf_backend_grok_psinfo elf_i386_grok_psinfo 3285#define elf_backend_reloc_type_class elf_i386_reloc_type_class 3286#define elf_backend_relocate_section elf_i386_relocate_section 3287#define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections 3288 3289#include "elf32-target.h" 3290 3291/* FreeBSD support. */ 3292 3293#undef TARGET_LITTLE_SYM 3294#define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec 3295#undef TARGET_LITTLE_NAME 3296#define TARGET_LITTLE_NAME "elf32-i386-freebsd" 3297 3298/* The kernel recognizes executables as valid only if they carry a 3299 "FreeBSD" label in the ELF header. So we put this label on all 3300 executables and (for simplicity) also all other object files. */ 3301 3302static void 3303elf_i386_post_process_headers (bfd *abfd, 3304 struct bfd_link_info *info ATTRIBUTE_UNUSED) 3305{ 3306 Elf_Internal_Ehdr *i_ehdrp; 3307 3308 i_ehdrp = elf_elfheader (abfd); 3309 3310 /* Put an ABI label supported by FreeBSD >= 4.1. */ 3311 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 3312#ifdef OLD_FREEBSD_ABI_LABEL 3313 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ 3314 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); 3315#endif 3316} 3317 3318#undef elf_backend_post_process_headers 3319#define elf_backend_post_process_headers elf_i386_post_process_headers 3320#undef elf32_bed 3321#define elf32_bed elf32_i386_fbsd_bed 3322 3323#include "elf32-target.h" 3324