| 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 | |
| 32 | static 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 | |
| 174 | static reloc_howto_type * |
| 175 | elf_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 | |
| 310 | static void |
| 311 | elf_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) (_("%B: invalid relocation type %d"), |
| 327 | 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 | |
| 339 | static bfd_boolean |
| 340 | elf_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 | \f |
| 348 | /* Support for core dump NOTE sections. */ |
| 349 | |
| 350 | static bfd_boolean |
| 351 | elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 352 | { |
| 353 | int offset; |
| 354 | size_t 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 | 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 | size = 68; |
| 390 | |
| 391 | break; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /* Make a ".reg/999" section. */ |
| 396 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 397 | size, note->descpos + offset); |
| 398 | } |
| 399 | |
| 400 | static bfd_boolean |
| 401 | elf_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 | \f |
| 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 | |
| 476 | static 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 | |
| 488 | static 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 | |
| 500 | static 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 | |
| 509 | static 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 | |
| 525 | struct 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 | |
| 541 | struct 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 | |
| 560 | struct 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 | |
| 574 | static bfd_boolean |
| 575 | elf_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 | |
| 586 | struct 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 | |
| 615 | static struct bfd_hash_entry * |
| 616 | link_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 | |
| 646 | static struct bfd_link_hash_table * |
| 647 | elf_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 | |
| 678 | static bfd_boolean |
| 679 | create_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 | |
| 707 | static bfd_boolean |
| 708 | elf_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 | |
| 734 | static void |
| 735 | elf_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 | |
| 801 | static int |
| 802 | elf_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 | |
| 830 | static bfd_boolean |
| 831 | elf_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) (_("%B: bad symbol index: %d"), |
| 865 | 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 | (_("%B: `%s' accessed both as normal and " |
| 973 | "thread local symbol"), |
| 974 | 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 | (_("%B: bad relocation section name `%s\'"), |
| 1090 | 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 | |
| 1182 | static asection * |
| 1183 | elf_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 | |
| 1220 | static bfd_boolean |
| 1221 | elf_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 | |
| 1317 | static bfd_boolean |
| 1318 | elf_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->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->size = BFD_ALIGN (s->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->size; |
| 1454 | |
| 1455 | /* Increment the section size to make room for the symbol. */ |
| 1456 | s->size += h->size; |
| 1457 | |
| 1458 | return TRUE; |
| 1459 | } |
| 1460 | |
| 1461 | /* Allocate space in .plt, .got and associated reloc sections for |
| 1462 | dynamic relocs. */ |
| 1463 | |
| 1464 | static bfd_boolean |
| 1465 | allocate_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->size == 0) |
| 1504 | s->size += PLT_ENTRY_SIZE; |
| 1505 | |
| 1506 | h->plt.offset = s->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->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->size += 4; |
| 1526 | |
| 1527 | /* We also need to make an entry in the .rel.plt section. */ |
| 1528 | htab->srelplt->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->size; |
| 1566 | s->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->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->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->size += sizeof (Elf32_External_Rel); |
| 1581 | else if (tls_type == GOT_TLS_GD) |
| 1582 | htab->srelgot->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->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->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 | |
| 1676 | static bfd_boolean |
| 1677 | readonly_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 | |
| 1705 | static bfd_boolean |
| 1706 | elf_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->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->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->size; |
| 1789 | s->size += 4; |
| 1790 | if (*local_tls_type == GOT_TLS_GD |
| 1791 | || *local_tls_type == GOT_TLS_IE_BOTH) |
| 1792 | s->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->size += 2 * sizeof (Elf32_External_Rel); |
| 1799 | else |
| 1800 | srel->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->size; |
| 1813 | htab->sgot->size += 8; |
| 1814 | htab->srelgot->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->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->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->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->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 | |
| 1932 | static bfd_boolean |
| 1933 | elf_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 | |
| 1967 | static bfd_vma |
| 1968 | dtpoff_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 | |
| 1979 | static bfd_vma |
| 1980 | tpoff (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 | |
| 1992 | static bfd_boolean |
| 1993 | elf_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_error_handler) |
| 2043 | (_("%B: unrecognized relocation (0x%x) in section `%A'"), |
| 2044 | input_bfd, input_section, r_type); |
| 2045 | bfd_set_error (bfd_error_bad_value); |
| 2046 | return FALSE; |
| 2047 | } |
| 2048 | howto = elf_howto_table + indx; |
| 2049 | |
| 2050 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2051 | |
| 2052 | if (info->relocatable) |
| 2053 | { |
| 2054 | bfd_vma val; |
| 2055 | bfd_byte *where; |
| 2056 | |
| 2057 | /* This is a relocatable link. We don't have to change |
| 2058 | anything, unless the reloc is against a section symbol, |
| 2059 | in which case we have to adjust according to where the |
| 2060 | section symbol winds up in the output section. */ |
| 2061 | if (r_symndx >= symtab_hdr->sh_info) |
| 2062 | continue; |
| 2063 | |
| 2064 | sym = local_syms + r_symndx; |
| 2065 | if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) |
| 2066 | continue; |
| 2067 | |
| 2068 | sec = local_sections[r_symndx]; |
| 2069 | val = sec->output_offset; |
| 2070 | if (val == 0) |
| 2071 | continue; |
| 2072 | |
| 2073 | where = contents + rel->r_offset; |
| 2074 | switch (howto->size) |
| 2075 | { |
| 2076 | /* FIXME: overflow checks. */ |
| 2077 | case 0: |
| 2078 | val += bfd_get_8 (input_bfd, where); |
| 2079 | bfd_put_8 (input_bfd, val, where); |
| 2080 | break; |
| 2081 | case 1: |
| 2082 | val += bfd_get_16 (input_bfd, where); |
| 2083 | bfd_put_16 (input_bfd, val, where); |
| 2084 | break; |
| 2085 | case 2: |
| 2086 | val += bfd_get_32 (input_bfd, where); |
| 2087 | bfd_put_32 (input_bfd, val, where); |
| 2088 | break; |
| 2089 | default: |
| 2090 | abort (); |
| 2091 | } |
| 2092 | continue; |
| 2093 | } |
| 2094 | |
| 2095 | /* This is a final link. */ |
| 2096 | h = NULL; |
| 2097 | sym = NULL; |
| 2098 | sec = NULL; |
| 2099 | unresolved_reloc = FALSE; |
| 2100 | if (r_symndx < symtab_hdr->sh_info) |
| 2101 | { |
| 2102 | sym = local_syms + r_symndx; |
| 2103 | sec = local_sections[r_symndx]; |
| 2104 | relocation = (sec->output_section->vma |
| 2105 | + sec->output_offset |
| 2106 | + sym->st_value); |
| 2107 | if ((sec->flags & SEC_MERGE) |
| 2108 | && ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 2109 | { |
| 2110 | asection *msec; |
| 2111 | bfd_vma addend; |
| 2112 | bfd_byte *where = contents + rel->r_offset; |
| 2113 | |
| 2114 | switch (howto->size) |
| 2115 | { |
| 2116 | case 0: |
| 2117 | addend = bfd_get_8 (input_bfd, where); |
| 2118 | if (howto->pc_relative) |
| 2119 | { |
| 2120 | addend = (addend ^ 0x80) - 0x80; |
| 2121 | addend += 1; |
| 2122 | } |
| 2123 | break; |
| 2124 | case 1: |
| 2125 | addend = bfd_get_16 (input_bfd, where); |
| 2126 | if (howto->pc_relative) |
| 2127 | { |
| 2128 | addend = (addend ^ 0x8000) - 0x8000; |
| 2129 | addend += 2; |
| 2130 | } |
| 2131 | break; |
| 2132 | case 2: |
| 2133 | addend = bfd_get_32 (input_bfd, where); |
| 2134 | if (howto->pc_relative) |
| 2135 | { |
| 2136 | addend = (addend ^ 0x80000000) - 0x80000000; |
| 2137 | addend += 4; |
| 2138 | } |
| 2139 | break; |
| 2140 | default: |
| 2141 | abort (); |
| 2142 | } |
| 2143 | |
| 2144 | msec = sec; |
| 2145 | addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend); |
| 2146 | addend -= relocation; |
| 2147 | addend += msec->output_section->vma + msec->output_offset; |
| 2148 | |
| 2149 | switch (howto->size) |
| 2150 | { |
| 2151 | case 0: |
| 2152 | /* FIXME: overflow checks. */ |
| 2153 | if (howto->pc_relative) |
| 2154 | addend -= 1; |
| 2155 | bfd_put_8 (input_bfd, addend, where); |
| 2156 | break; |
| 2157 | case 1: |
| 2158 | if (howto->pc_relative) |
| 2159 | addend -= 2; |
| 2160 | bfd_put_16 (input_bfd, addend, where); |
| 2161 | break; |
| 2162 | case 2: |
| 2163 | if (howto->pc_relative) |
| 2164 | addend -= 4; |
| 2165 | bfd_put_32 (input_bfd, addend, where); |
| 2166 | break; |
| 2167 | } |
| 2168 | } |
| 2169 | } |
| 2170 | else |
| 2171 | { |
| 2172 | bfd_boolean warned; |
| 2173 | |
| 2174 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 2175 | r_symndx, symtab_hdr, sym_hashes, |
| 2176 | h, sec, relocation, |
| 2177 | unresolved_reloc, warned); |
| 2178 | } |
| 2179 | |
| 2180 | switch (r_type) |
| 2181 | { |
| 2182 | case R_386_GOT32: |
| 2183 | /* Relocation is to the entry for this symbol in the global |
| 2184 | offset table. */ |
| 2185 | if (htab->sgot == NULL) |
| 2186 | abort (); |
| 2187 | |
| 2188 | if (h != NULL) |
| 2189 | { |
| 2190 | bfd_boolean dyn; |
| 2191 | |
| 2192 | off = h->got.offset; |
| 2193 | dyn = htab->elf.dynamic_sections_created; |
| 2194 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| 2195 | || (info->shared |
| 2196 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 2197 | || (ELF_ST_VISIBILITY (h->other) |
| 2198 | && h->root.type == bfd_link_hash_undefweak)) |
| 2199 | { |
| 2200 | /* This is actually a static link, or it is a |
| 2201 | -Bsymbolic link and the symbol is defined |
| 2202 | locally, or the symbol was forced to be local |
| 2203 | because of a version file. We must initialize |
| 2204 | this entry in the global offset table. Since the |
| 2205 | offset must always be a multiple of 4, we use the |
| 2206 | least significant bit to record whether we have |
| 2207 | initialized it already. |
| 2208 | |
| 2209 | When doing a dynamic link, we create a .rel.got |
| 2210 | relocation entry to initialize the value. This |
| 2211 | is done in the finish_dynamic_symbol routine. */ |
| 2212 | if ((off & 1) != 0) |
| 2213 | off &= ~1; |
| 2214 | else |
| 2215 | { |
| 2216 | bfd_put_32 (output_bfd, relocation, |
| 2217 | htab->sgot->contents + off); |
| 2218 | h->got.offset |= 1; |
| 2219 | } |
| 2220 | } |
| 2221 | else |
| 2222 | unresolved_reloc = FALSE; |
| 2223 | } |
| 2224 | else |
| 2225 | { |
| 2226 | if (local_got_offsets == NULL) |
| 2227 | abort (); |
| 2228 | |
| 2229 | off = local_got_offsets[r_symndx]; |
| 2230 | |
| 2231 | /* The offset must always be a multiple of 4. We use |
| 2232 | the least significant bit to record whether we have |
| 2233 | already generated the necessary reloc. */ |
| 2234 | if ((off & 1) != 0) |
| 2235 | off &= ~1; |
| 2236 | else |
| 2237 | { |
| 2238 | bfd_put_32 (output_bfd, relocation, |
| 2239 | htab->sgot->contents + off); |
| 2240 | |
| 2241 | if (info->shared) |
| 2242 | { |
| 2243 | asection *s; |
| 2244 | Elf_Internal_Rela outrel; |
| 2245 | bfd_byte *loc; |
| 2246 | |
| 2247 | s = htab->srelgot; |
| 2248 | if (s == NULL) |
| 2249 | abort (); |
| 2250 | |
| 2251 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2252 | + htab->sgot->output_offset |
| 2253 | + off); |
| 2254 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2255 | loc = s->contents; |
| 2256 | loc += s->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2257 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2258 | } |
| 2259 | |
| 2260 | local_got_offsets[r_symndx] |= 1; |
| 2261 | } |
| 2262 | } |
| 2263 | |
| 2264 | if (off >= (bfd_vma) -2) |
| 2265 | abort (); |
| 2266 | |
| 2267 | relocation = htab->sgot->output_section->vma |
| 2268 | + htab->sgot->output_offset + off |
| 2269 | - htab->sgotplt->output_section->vma |
| 2270 | - htab->sgotplt->output_offset; |
| 2271 | break; |
| 2272 | |
| 2273 | case R_386_GOTOFF: |
| 2274 | /* Relocation is relative to the start of the global offset |
| 2275 | table. */ |
| 2276 | |
| 2277 | /* Note that sgot is not involved in this |
| 2278 | calculation. We always want the start of .got.plt. If we |
| 2279 | defined _GLOBAL_OFFSET_TABLE_ in a different way, as is |
| 2280 | permitted by the ABI, we might have to change this |
| 2281 | calculation. */ |
| 2282 | relocation -= htab->sgotplt->output_section->vma |
| 2283 | + htab->sgotplt->output_offset; |
| 2284 | break; |
| 2285 | |
| 2286 | case R_386_GOTPC: |
| 2287 | /* Use global offset table as symbol value. */ |
| 2288 | relocation = htab->sgotplt->output_section->vma |
| 2289 | + htab->sgotplt->output_offset; |
| 2290 | unresolved_reloc = FALSE; |
| 2291 | break; |
| 2292 | |
| 2293 | case R_386_PLT32: |
| 2294 | /* Relocation is to the entry for this symbol in the |
| 2295 | procedure linkage table. */ |
| 2296 | |
| 2297 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 2298 | without using the procedure linkage table. */ |
| 2299 | if (h == NULL) |
| 2300 | break; |
| 2301 | |
| 2302 | if (h->plt.offset == (bfd_vma) -1 |
| 2303 | || htab->splt == NULL) |
| 2304 | { |
| 2305 | /* We didn't make a PLT entry for this symbol. This |
| 2306 | happens when statically linking PIC code, or when |
| 2307 | using -Bsymbolic. */ |
| 2308 | break; |
| 2309 | } |
| 2310 | |
| 2311 | relocation = (htab->splt->output_section->vma |
| 2312 | + htab->splt->output_offset |
| 2313 | + h->plt.offset); |
| 2314 | unresolved_reloc = FALSE; |
| 2315 | break; |
| 2316 | |
| 2317 | case R_386_32: |
| 2318 | case R_386_PC32: |
| 2319 | /* r_symndx will be zero only for relocs against symbols |
| 2320 | from removed linkonce sections, or sections discarded by |
| 2321 | a linker script. */ |
| 2322 | if (r_symndx == 0) |
| 2323 | { |
| 2324 | /* Zero the section contents. eh_frame generated by old |
| 2325 | versions of gcc isn't edited by elf-eh-frame.c, so |
| 2326 | FDEs for discarded linkonce functions might remain. |
| 2327 | Putting zeros here will zero such FDE's address range. |
| 2328 | This is a hint to unwinders and other consumers of |
| 2329 | exception handling info that the FDE is invalid. */ |
| 2330 | bfd_put_32 (input_bfd, 0, contents + rel->r_offset); |
| 2331 | break; |
| 2332 | } |
| 2333 | |
| 2334 | if ((input_section->flags & SEC_ALLOC) == 0) |
| 2335 | break; |
| 2336 | |
| 2337 | if ((info->shared |
| 2338 | && (h == NULL |
| 2339 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2340 | || h->root.type != bfd_link_hash_undefweak) |
| 2341 | && (r_type != R_386_PC32 |
| 2342 | || !SYMBOL_CALLS_LOCAL (info, h))) |
| 2343 | || (ELIMINATE_COPY_RELOCS |
| 2344 | && !info->shared |
| 2345 | && h != NULL |
| 2346 | && h->dynindx != -1 |
| 2347 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 2348 | && (((h->elf_link_hash_flags |
| 2349 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 2350 | && (h->elf_link_hash_flags |
| 2351 | & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 2352 | || h->root.type == bfd_link_hash_undefweak |
| 2353 | || h->root.type == bfd_link_hash_undefined))) |
| 2354 | { |
| 2355 | Elf_Internal_Rela outrel; |
| 2356 | bfd_byte *loc; |
| 2357 | bfd_boolean skip, relocate; |
| 2358 | asection *sreloc; |
| 2359 | |
| 2360 | /* When generating a shared object, these relocations |
| 2361 | are copied into the output file to be resolved at run |
| 2362 | time. */ |
| 2363 | |
| 2364 | skip = FALSE; |
| 2365 | relocate = FALSE; |
| 2366 | |
| 2367 | outrel.r_offset = |
| 2368 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 2369 | rel->r_offset); |
| 2370 | if (outrel.r_offset == (bfd_vma) -1) |
| 2371 | skip = TRUE; |
| 2372 | else if (outrel.r_offset == (bfd_vma) -2) |
| 2373 | skip = TRUE, relocate = TRUE; |
| 2374 | outrel.r_offset += (input_section->output_section->vma |
| 2375 | + input_section->output_offset); |
| 2376 | |
| 2377 | if (skip) |
| 2378 | memset (&outrel, 0, sizeof outrel); |
| 2379 | else if (h != NULL |
| 2380 | && h->dynindx != -1 |
| 2381 | && (r_type == R_386_PC32 |
| 2382 | || !info->shared |
| 2383 | || !info->symbolic |
| 2384 | || (h->elf_link_hash_flags |
| 2385 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 2386 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 2387 | else |
| 2388 | { |
| 2389 | /* This symbol is local, or marked to become local. */ |
| 2390 | relocate = TRUE; |
| 2391 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2392 | } |
| 2393 | |
| 2394 | sreloc = elf_section_data (input_section)->sreloc; |
| 2395 | if (sreloc == NULL) |
| 2396 | abort (); |
| 2397 | |
| 2398 | loc = sreloc->contents; |
| 2399 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2400 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2401 | |
| 2402 | /* If this reloc is against an external symbol, we do |
| 2403 | not want to fiddle with the addend. Otherwise, we |
| 2404 | need to include the symbol value so that it becomes |
| 2405 | an addend for the dynamic reloc. */ |
| 2406 | if (! relocate) |
| 2407 | continue; |
| 2408 | } |
| 2409 | break; |
| 2410 | |
| 2411 | case R_386_TLS_IE: |
| 2412 | if (info->shared) |
| 2413 | { |
| 2414 | Elf_Internal_Rela outrel; |
| 2415 | bfd_byte *loc; |
| 2416 | asection *sreloc; |
| 2417 | |
| 2418 | outrel.r_offset = rel->r_offset |
| 2419 | + input_section->output_section->vma |
| 2420 | + input_section->output_offset; |
| 2421 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2422 | sreloc = elf_section_data (input_section)->sreloc; |
| 2423 | if (sreloc == NULL) |
| 2424 | abort (); |
| 2425 | loc = sreloc->contents; |
| 2426 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2427 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2428 | } |
| 2429 | /* Fall through */ |
| 2430 | |
| 2431 | case R_386_TLS_GD: |
| 2432 | case R_386_TLS_IE_32: |
| 2433 | case R_386_TLS_GOTIE: |
| 2434 | r_type = elf_i386_tls_transition (info, r_type, h == NULL); |
| 2435 | tls_type = GOT_UNKNOWN; |
| 2436 | if (h == NULL && local_got_offsets) |
| 2437 | tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx]; |
| 2438 | else if (h != NULL) |
| 2439 | { |
| 2440 | tls_type = elf_i386_hash_entry(h)->tls_type; |
| 2441 | if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE)) |
| 2442 | r_type = R_386_TLS_LE_32; |
| 2443 | } |
| 2444 | if (tls_type == GOT_TLS_IE) |
| 2445 | tls_type = GOT_TLS_IE_NEG; |
| 2446 | if (r_type == R_386_TLS_GD) |
| 2447 | { |
| 2448 | if (tls_type == GOT_TLS_IE_POS) |
| 2449 | r_type = R_386_TLS_GOTIE; |
| 2450 | else if (tls_type & GOT_TLS_IE) |
| 2451 | r_type = R_386_TLS_IE_32; |
| 2452 | } |
| 2453 | |
| 2454 | if (r_type == R_386_TLS_LE_32) |
| 2455 | { |
| 2456 | BFD_ASSERT (! unresolved_reloc); |
| 2457 | if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) |
| 2458 | { |
| 2459 | unsigned int val, type; |
| 2460 | bfd_vma roff; |
| 2461 | |
| 2462 | /* GD->LE transition. */ |
| 2463 | BFD_ASSERT (rel->r_offset >= 2); |
| 2464 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2465 | BFD_ASSERT (type == 0x8d || type == 0x04); |
| 2466 | BFD_ASSERT (rel->r_offset + 9 <= input_section->size); |
| 2467 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2468 | contents + rel->r_offset + 4) |
| 2469 | == 0xe8); |
| 2470 | BFD_ASSERT (rel + 1 < relend); |
| 2471 | BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); |
| 2472 | roff = rel->r_offset + 5; |
| 2473 | val = bfd_get_8 (input_bfd, |
| 2474 | contents + rel->r_offset - 1); |
| 2475 | if (type == 0x04) |
| 2476 | { |
| 2477 | /* leal foo(,%reg,1), %eax; call ___tls_get_addr |
| 2478 | Change it into: |
| 2479 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2480 | (6 byte form of subl). */ |
| 2481 | BFD_ASSERT (rel->r_offset >= 3); |
| 2482 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2483 | contents + rel->r_offset - 3) |
| 2484 | == 0x8d); |
| 2485 | BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); |
| 2486 | memcpy (contents + rel->r_offset - 3, |
| 2487 | "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
| 2488 | } |
| 2489 | else |
| 2490 | { |
| 2491 | BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); |
| 2492 | if (rel->r_offset + 10 <= input_section->size |
| 2493 | && bfd_get_8 (input_bfd, |
| 2494 | contents + rel->r_offset + 9) == 0x90) |
| 2495 | { |
| 2496 | /* leal foo(%reg), %eax; call ___tls_get_addr; nop |
| 2497 | Change it into: |
| 2498 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2499 | (6 byte form of subl). */ |
| 2500 | memcpy (contents + rel->r_offset - 2, |
| 2501 | "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
| 2502 | roff = rel->r_offset + 6; |
| 2503 | } |
| 2504 | else |
| 2505 | { |
| 2506 | /* leal foo(%reg), %eax; call ___tls_get_addr |
| 2507 | Change it into: |
| 2508 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2509 | (5 byte form of subl). */ |
| 2510 | memcpy (contents + rel->r_offset - 2, |
| 2511 | "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); |
| 2512 | } |
| 2513 | } |
| 2514 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2515 | contents + roff); |
| 2516 | /* Skip R_386_PLT32. */ |
| 2517 | rel++; |
| 2518 | continue; |
| 2519 | } |
| 2520 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE) |
| 2521 | { |
| 2522 | unsigned int val, type; |
| 2523 | |
| 2524 | /* IE->LE transition: |
| 2525 | Originally it can be one of: |
| 2526 | movl foo, %eax |
| 2527 | movl foo, %reg |
| 2528 | addl foo, %reg |
| 2529 | We change it into: |
| 2530 | movl $foo, %eax |
| 2531 | movl $foo, %reg |
| 2532 | addl $foo, %reg. */ |
| 2533 | BFD_ASSERT (rel->r_offset >= 1); |
| 2534 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2535 | BFD_ASSERT (rel->r_offset + 4 <= input_section->size); |
| 2536 | if (val == 0xa1) |
| 2537 | { |
| 2538 | /* movl foo, %eax. */ |
| 2539 | bfd_put_8 (output_bfd, 0xb8, |
| 2540 | contents + rel->r_offset - 1); |
| 2541 | } |
| 2542 | else |
| 2543 | { |
| 2544 | BFD_ASSERT (rel->r_offset >= 2); |
| 2545 | type = bfd_get_8 (input_bfd, |
| 2546 | contents + rel->r_offset - 2); |
| 2547 | switch (type) |
| 2548 | { |
| 2549 | case 0x8b: |
| 2550 | /* movl */ |
| 2551 | BFD_ASSERT ((val & 0xc7) == 0x05); |
| 2552 | bfd_put_8 (output_bfd, 0xc7, |
| 2553 | contents + rel->r_offset - 2); |
| 2554 | bfd_put_8 (output_bfd, |
| 2555 | 0xc0 | ((val >> 3) & 7), |
| 2556 | contents + rel->r_offset - 1); |
| 2557 | break; |
| 2558 | case 0x03: |
| 2559 | /* addl */ |
| 2560 | BFD_ASSERT ((val & 0xc7) == 0x05); |
| 2561 | bfd_put_8 (output_bfd, 0x81, |
| 2562 | contents + rel->r_offset - 2); |
| 2563 | bfd_put_8 (output_bfd, |
| 2564 | 0xc0 | ((val >> 3) & 7), |
| 2565 | contents + rel->r_offset - 1); |
| 2566 | break; |
| 2567 | default: |
| 2568 | BFD_FAIL (); |
| 2569 | break; |
| 2570 | } |
| 2571 | } |
| 2572 | bfd_put_32 (output_bfd, -tpoff (info, relocation), |
| 2573 | contents + rel->r_offset); |
| 2574 | continue; |
| 2575 | } |
| 2576 | else |
| 2577 | { |
| 2578 | unsigned int val, type; |
| 2579 | |
| 2580 | /* {IE_32,GOTIE}->LE transition: |
| 2581 | Originally it can be one of: |
| 2582 | subl foo(%reg1), %reg2 |
| 2583 | movl foo(%reg1), %reg2 |
| 2584 | addl foo(%reg1), %reg2 |
| 2585 | We change it into: |
| 2586 | subl $foo, %reg2 |
| 2587 | movl $foo, %reg2 (6 byte form) |
| 2588 | addl $foo, %reg2. */ |
| 2589 | BFD_ASSERT (rel->r_offset >= 2); |
| 2590 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2591 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2592 | BFD_ASSERT (rel->r_offset + 4 <= input_section->size); |
| 2593 | BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4); |
| 2594 | if (type == 0x8b) |
| 2595 | { |
| 2596 | /* movl */ |
| 2597 | bfd_put_8 (output_bfd, 0xc7, |
| 2598 | contents + rel->r_offset - 2); |
| 2599 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 2600 | contents + rel->r_offset - 1); |
| 2601 | } |
| 2602 | else if (type == 0x2b) |
| 2603 | { |
| 2604 | /* subl */ |
| 2605 | bfd_put_8 (output_bfd, 0x81, |
| 2606 | contents + rel->r_offset - 2); |
| 2607 | bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), |
| 2608 | contents + rel->r_offset - 1); |
| 2609 | } |
| 2610 | else if (type == 0x03) |
| 2611 | { |
| 2612 | /* addl */ |
| 2613 | bfd_put_8 (output_bfd, 0x81, |
| 2614 | contents + rel->r_offset - 2); |
| 2615 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 2616 | contents + rel->r_offset - 1); |
| 2617 | } |
| 2618 | else |
| 2619 | BFD_FAIL (); |
| 2620 | if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE) |
| 2621 | bfd_put_32 (output_bfd, -tpoff (info, relocation), |
| 2622 | contents + rel->r_offset); |
| 2623 | else |
| 2624 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2625 | contents + rel->r_offset); |
| 2626 | continue; |
| 2627 | } |
| 2628 | } |
| 2629 | |
| 2630 | if (htab->sgot == NULL) |
| 2631 | abort (); |
| 2632 | |
| 2633 | if (h != NULL) |
| 2634 | off = h->got.offset; |
| 2635 | else |
| 2636 | { |
| 2637 | if (local_got_offsets == NULL) |
| 2638 | abort (); |
| 2639 | |
| 2640 | off = local_got_offsets[r_symndx]; |
| 2641 | } |
| 2642 | |
| 2643 | if ((off & 1) != 0) |
| 2644 | off &= ~1; |
| 2645 | else |
| 2646 | { |
| 2647 | Elf_Internal_Rela outrel; |
| 2648 | bfd_byte *loc; |
| 2649 | int dr_type, indx; |
| 2650 | |
| 2651 | if (htab->srelgot == NULL) |
| 2652 | abort (); |
| 2653 | |
| 2654 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2655 | + htab->sgot->output_offset + off); |
| 2656 | |
| 2657 | indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| 2658 | if (r_type == R_386_TLS_GD) |
| 2659 | dr_type = R_386_TLS_DTPMOD32; |
| 2660 | else if (tls_type == GOT_TLS_IE_POS) |
| 2661 | dr_type = R_386_TLS_TPOFF; |
| 2662 | else |
| 2663 | dr_type = R_386_TLS_TPOFF32; |
| 2664 | if (dr_type == R_386_TLS_TPOFF && indx == 0) |
| 2665 | bfd_put_32 (output_bfd, relocation - dtpoff_base (info), |
| 2666 | htab->sgot->contents + off); |
| 2667 | else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) |
| 2668 | bfd_put_32 (output_bfd, dtpoff_base (info) - relocation, |
| 2669 | htab->sgot->contents + off); |
| 2670 | else |
| 2671 | bfd_put_32 (output_bfd, 0, |
| 2672 | htab->sgot->contents + off); |
| 2673 | outrel.r_info = ELF32_R_INFO (indx, dr_type); |
| 2674 | loc = htab->srelgot->contents; |
| 2675 | loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2676 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2677 | |
| 2678 | if (r_type == R_386_TLS_GD) |
| 2679 | { |
| 2680 | if (indx == 0) |
| 2681 | { |
| 2682 | BFD_ASSERT (! unresolved_reloc); |
| 2683 | bfd_put_32 (output_bfd, |
| 2684 | relocation - dtpoff_base (info), |
| 2685 | htab->sgot->contents + off + 4); |
| 2686 | } |
| 2687 | else |
| 2688 | { |
| 2689 | bfd_put_32 (output_bfd, 0, |
| 2690 | htab->sgot->contents + off + 4); |
| 2691 | outrel.r_info = ELF32_R_INFO (indx, |
| 2692 | R_386_TLS_DTPOFF32); |
| 2693 | outrel.r_offset += 4; |
| 2694 | htab->srelgot->reloc_count++; |
| 2695 | loc += sizeof (Elf32_External_Rel); |
| 2696 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2697 | } |
| 2698 | } |
| 2699 | else if (tls_type == GOT_TLS_IE_BOTH) |
| 2700 | { |
| 2701 | bfd_put_32 (output_bfd, |
| 2702 | indx == 0 ? relocation - dtpoff_base (info) : 0, |
| 2703 | htab->sgot->contents + off + 4); |
| 2704 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); |
| 2705 | outrel.r_offset += 4; |
| 2706 | htab->srelgot->reloc_count++; |
| 2707 | loc += sizeof (Elf32_External_Rel); |
| 2708 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2709 | } |
| 2710 | |
| 2711 | if (h != NULL) |
| 2712 | h->got.offset |= 1; |
| 2713 | else |
| 2714 | local_got_offsets[r_symndx] |= 1; |
| 2715 | } |
| 2716 | |
| 2717 | if (off >= (bfd_vma) -2) |
| 2718 | abort (); |
| 2719 | if (r_type == ELF32_R_TYPE (rel->r_info)) |
| 2720 | { |
| 2721 | bfd_vma g_o_t = htab->sgotplt->output_section->vma |
| 2722 | + htab->sgotplt->output_offset; |
| 2723 | relocation = htab->sgot->output_section->vma |
| 2724 | + htab->sgot->output_offset + off - g_o_t; |
| 2725 | if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) |
| 2726 | && tls_type == GOT_TLS_IE_BOTH) |
| 2727 | relocation += 4; |
| 2728 | if (r_type == R_386_TLS_IE) |
| 2729 | relocation += g_o_t; |
| 2730 | unresolved_reloc = FALSE; |
| 2731 | } |
| 2732 | else |
| 2733 | { |
| 2734 | unsigned int val, type; |
| 2735 | bfd_vma roff; |
| 2736 | |
| 2737 | /* GD->IE transition. */ |
| 2738 | BFD_ASSERT (rel->r_offset >= 2); |
| 2739 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2740 | BFD_ASSERT (type == 0x8d || type == 0x04); |
| 2741 | BFD_ASSERT (rel->r_offset + 9 <= input_section->size); |
| 2742 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) |
| 2743 | == 0xe8); |
| 2744 | BFD_ASSERT (rel + 1 < relend); |
| 2745 | BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); |
| 2746 | roff = rel->r_offset - 3; |
| 2747 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2748 | if (type == 0x04) |
| 2749 | { |
| 2750 | /* leal foo(,%reg,1), %eax; call ___tls_get_addr |
| 2751 | Change it into: |
| 2752 | movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ |
| 2753 | BFD_ASSERT (rel->r_offset >= 3); |
| 2754 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2755 | contents + rel->r_offset - 3) |
| 2756 | == 0x8d); |
| 2757 | BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); |
| 2758 | val >>= 3; |
| 2759 | } |
| 2760 | else |
| 2761 | { |
| 2762 | /* leal foo(%reg), %eax; call ___tls_get_addr; nop |
| 2763 | Change it into: |
| 2764 | movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ |
| 2765 | BFD_ASSERT (rel->r_offset + 10 <= input_section->size); |
| 2766 | BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); |
| 2767 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2768 | contents + rel->r_offset + 9) |
| 2769 | == 0x90); |
| 2770 | roff = rel->r_offset - 2; |
| 2771 | } |
| 2772 | memcpy (contents + roff, |
| 2773 | "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); |
| 2774 | contents[roff + 7] = 0x80 | (val & 7); |
| 2775 | /* If foo is used only with foo@gotntpoff(%reg) and |
| 2776 | foo@indntpoff, but not with foo@gottpoff(%reg), change |
| 2777 | subl $foo@gottpoff(%reg), %eax |
| 2778 | into: |
| 2779 | addl $foo@gotntpoff(%reg), %eax. */ |
| 2780 | if (r_type == R_386_TLS_GOTIE) |
| 2781 | { |
| 2782 | contents[roff + 6] = 0x03; |
| 2783 | if (tls_type == GOT_TLS_IE_BOTH) |
| 2784 | off += 4; |
| 2785 | } |
| 2786 | bfd_put_32 (output_bfd, |
| 2787 | htab->sgot->output_section->vma |
| 2788 | + htab->sgot->output_offset + off |
| 2789 | - htab->sgotplt->output_section->vma |
| 2790 | - htab->sgotplt->output_offset, |
| 2791 | contents + roff + 8); |
| 2792 | /* Skip R_386_PLT32. */ |
| 2793 | rel++; |
| 2794 | continue; |
| 2795 | } |
| 2796 | break; |
| 2797 | |
| 2798 | case R_386_TLS_LDM: |
| 2799 | if (! info->shared) |
| 2800 | { |
| 2801 | unsigned int val; |
| 2802 | |
| 2803 | /* LD->LE transition: |
| 2804 | Ensure it is: |
| 2805 | leal foo(%reg), %eax; call ___tls_get_addr. |
| 2806 | We change it into: |
| 2807 | movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */ |
| 2808 | BFD_ASSERT (rel->r_offset >= 2); |
| 2809 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2) |
| 2810 | == 0x8d); |
| 2811 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2812 | BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); |
| 2813 | BFD_ASSERT (rel->r_offset + 9 <= input_section->size); |
| 2814 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) |
| 2815 | == 0xe8); |
| 2816 | BFD_ASSERT (rel + 1 < relend); |
| 2817 | BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); |
| 2818 | memcpy (contents + rel->r_offset - 2, |
| 2819 | "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); |
| 2820 | /* Skip R_386_PLT32. */ |
| 2821 | rel++; |
| 2822 | continue; |
| 2823 | } |
| 2824 | |
| 2825 | if (htab->sgot == NULL) |
| 2826 | abort (); |
| 2827 | |
| 2828 | off = htab->tls_ldm_got.offset; |
| 2829 | if (off & 1) |
| 2830 | off &= ~1; |
| 2831 | else |
| 2832 | { |
| 2833 | Elf_Internal_Rela outrel; |
| 2834 | bfd_byte *loc; |
| 2835 | |
| 2836 | if (htab->srelgot == NULL) |
| 2837 | abort (); |
| 2838 | |
| 2839 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2840 | + htab->sgot->output_offset + off); |
| 2841 | |
| 2842 | bfd_put_32 (output_bfd, 0, |
| 2843 | htab->sgot->contents + off); |
| 2844 | bfd_put_32 (output_bfd, 0, |
| 2845 | htab->sgot->contents + off + 4); |
| 2846 | outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); |
| 2847 | loc = htab->srelgot->contents; |
| 2848 | loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2849 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2850 | htab->tls_ldm_got.offset |= 1; |
| 2851 | } |
| 2852 | relocation = htab->sgot->output_section->vma |
| 2853 | + htab->sgot->output_offset + off |
| 2854 | - htab->sgotplt->output_section->vma |
| 2855 | - htab->sgotplt->output_offset; |
| 2856 | unresolved_reloc = FALSE; |
| 2857 | break; |
| 2858 | |
| 2859 | case R_386_TLS_LDO_32: |
| 2860 | if (info->shared || (input_section->flags & SEC_CODE) == 0) |
| 2861 | relocation -= dtpoff_base (info); |
| 2862 | else |
| 2863 | /* When converting LDO to LE, we must negate. */ |
| 2864 | relocation = -tpoff (info, relocation); |
| 2865 | break; |
| 2866 | |
| 2867 | case R_386_TLS_LE_32: |
| 2868 | case R_386_TLS_LE: |
| 2869 | if (info->shared) |
| 2870 | { |
| 2871 | Elf_Internal_Rela outrel; |
| 2872 | asection *sreloc; |
| 2873 | bfd_byte *loc; |
| 2874 | int indx; |
| 2875 | |
| 2876 | outrel.r_offset = rel->r_offset |
| 2877 | + input_section->output_section->vma |
| 2878 | + input_section->output_offset; |
| 2879 | if (h != NULL && h->dynindx != -1) |
| 2880 | indx = h->dynindx; |
| 2881 | else |
| 2882 | indx = 0; |
| 2883 | if (r_type == R_386_TLS_LE_32) |
| 2884 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); |
| 2885 | else |
| 2886 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); |
| 2887 | sreloc = elf_section_data (input_section)->sreloc; |
| 2888 | if (sreloc == NULL) |
| 2889 | abort (); |
| 2890 | loc = sreloc->contents; |
| 2891 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2892 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2893 | if (indx) |
| 2894 | continue; |
| 2895 | else if (r_type == R_386_TLS_LE_32) |
| 2896 | relocation = dtpoff_base (info) - relocation; |
| 2897 | else |
| 2898 | relocation -= dtpoff_base (info); |
| 2899 | } |
| 2900 | else if (r_type == R_386_TLS_LE_32) |
| 2901 | relocation = tpoff (info, relocation); |
| 2902 | else |
| 2903 | relocation = -tpoff (info, relocation); |
| 2904 | break; |
| 2905 | |
| 2906 | default: |
| 2907 | break; |
| 2908 | } |
| 2909 | |
| 2910 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 2911 | because such sections are not SEC_ALLOC and thus ld.so will |
| 2912 | not process them. */ |
| 2913 | if (unresolved_reloc |
| 2914 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 2915 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) |
| 2916 | { |
| 2917 | (*_bfd_error_handler) |
| 2918 | (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"), |
| 2919 | input_bfd, |
| 2920 | input_section, |
| 2921 | (long) rel->r_offset, |
| 2922 | h->root.root.string); |
| 2923 | return FALSE; |
| 2924 | } |
| 2925 | |
| 2926 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 2927 | contents, rel->r_offset, |
| 2928 | relocation, 0); |
| 2929 | |
| 2930 | if (r != bfd_reloc_ok) |
| 2931 | { |
| 2932 | const char *name; |
| 2933 | |
| 2934 | if (h != NULL) |
| 2935 | name = h->root.root.string; |
| 2936 | else |
| 2937 | { |
| 2938 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 2939 | symtab_hdr->sh_link, |
| 2940 | sym->st_name); |
| 2941 | if (name == NULL) |
| 2942 | return FALSE; |
| 2943 | if (*name == '\0') |
| 2944 | name = bfd_section_name (input_bfd, sec); |
| 2945 | } |
| 2946 | |
| 2947 | if (r == bfd_reloc_overflow) |
| 2948 | { |
| 2949 | if (! ((*info->callbacks->reloc_overflow) |
| 2950 | (info, name, howto->name, 0, |
| 2951 | input_bfd, input_section, rel->r_offset))) |
| 2952 | return FALSE; |
| 2953 | } |
| 2954 | else |
| 2955 | { |
| 2956 | (*_bfd_error_handler) |
| 2957 | (_("%B(%A+0x%lx): reloc against `%s': error %d"), |
| 2958 | input_bfd, input_section, |
| 2959 | (long) rel->r_offset, name, (int) r); |
| 2960 | return FALSE; |
| 2961 | } |
| 2962 | } |
| 2963 | } |
| 2964 | |
| 2965 | return TRUE; |
| 2966 | } |
| 2967 | |
| 2968 | /* Finish up dynamic symbol handling. We set the contents of various |
| 2969 | dynamic sections here. */ |
| 2970 | |
| 2971 | static bfd_boolean |
| 2972 | elf_i386_finish_dynamic_symbol (bfd *output_bfd, |
| 2973 | struct bfd_link_info *info, |
| 2974 | struct elf_link_hash_entry *h, |
| 2975 | Elf_Internal_Sym *sym) |
| 2976 | { |
| 2977 | struct elf_i386_link_hash_table *htab; |
| 2978 | |
| 2979 | htab = elf_i386_hash_table (info); |
| 2980 | |
| 2981 | if (h->plt.offset != (bfd_vma) -1) |
| 2982 | { |
| 2983 | bfd_vma plt_index; |
| 2984 | bfd_vma got_offset; |
| 2985 | Elf_Internal_Rela rel; |
| 2986 | bfd_byte *loc; |
| 2987 | |
| 2988 | /* This symbol has an entry in the procedure linkage table. Set |
| 2989 | it up. */ |
| 2990 | |
| 2991 | if (h->dynindx == -1 |
| 2992 | || htab->splt == NULL |
| 2993 | || htab->sgotplt == NULL |
| 2994 | || htab->srelplt == NULL) |
| 2995 | abort (); |
| 2996 | |
| 2997 | /* Get the index in the procedure linkage table which |
| 2998 | corresponds to this symbol. This is the index of this symbol |
| 2999 | in all the symbols for which we are making plt entries. The |
| 3000 | first entry in the procedure linkage table is reserved. */ |
| 3001 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 3002 | |
| 3003 | /* Get the offset into the .got table of the entry that |
| 3004 | corresponds to this function. Each .got entry is 4 bytes. |
| 3005 | The first three are reserved. */ |
| 3006 | got_offset = (plt_index + 3) * 4; |
| 3007 | |
| 3008 | /* Fill in the entry in the procedure linkage table. */ |
| 3009 | if (! info->shared) |
| 3010 | { |
| 3011 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry, |
| 3012 | PLT_ENTRY_SIZE); |
| 3013 | bfd_put_32 (output_bfd, |
| 3014 | (htab->sgotplt->output_section->vma |
| 3015 | + htab->sgotplt->output_offset |
| 3016 | + got_offset), |
| 3017 | htab->splt->contents + h->plt.offset + 2); |
| 3018 | } |
| 3019 | else |
| 3020 | { |
| 3021 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry, |
| 3022 | PLT_ENTRY_SIZE); |
| 3023 | bfd_put_32 (output_bfd, got_offset, |
| 3024 | htab->splt->contents + h->plt.offset + 2); |
| 3025 | } |
| 3026 | |
| 3027 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), |
| 3028 | htab->splt->contents + h->plt.offset + 7); |
| 3029 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| 3030 | htab->splt->contents + h->plt.offset + 12); |
| 3031 | |
| 3032 | /* Fill in the entry in the global offset table. */ |
| 3033 | bfd_put_32 (output_bfd, |
| 3034 | (htab->splt->output_section->vma |
| 3035 | + htab->splt->output_offset |
| 3036 | + h->plt.offset |
| 3037 | + 6), |
| 3038 | htab->sgotplt->contents + got_offset); |
| 3039 | |
| 3040 | /* Fill in the entry in the .rel.plt section. */ |
| 3041 | rel.r_offset = (htab->sgotplt->output_section->vma |
| 3042 | + htab->sgotplt->output_offset |
| 3043 | + got_offset); |
| 3044 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); |
| 3045 | loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel); |
| 3046 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3047 | |
| 3048 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 3049 | { |
| 3050 | /* Mark the symbol as undefined, rather than as defined in |
| 3051 | the .plt section. Leave the value if there were any |
| 3052 | relocations where pointer equality matters (this is a clue |
| 3053 | for the dynamic linker, to make function pointer |
| 3054 | comparisons work between an application and shared |
| 3055 | library), otherwise set it to zero. If a function is only |
| 3056 | called from a binary, there is no need to slow down |
| 3057 | shared libraries because of that. */ |
| 3058 | sym->st_shndx = SHN_UNDEF; |
| 3059 | if ((h->elf_link_hash_flags & ELF_LINK_POINTER_EQUALITY_NEEDED) == 0) |
| 3060 | sym->st_value = 0; |
| 3061 | } |
| 3062 | } |
| 3063 | |
| 3064 | if (h->got.offset != (bfd_vma) -1 |
| 3065 | && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD |
| 3066 | && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0) |
| 3067 | { |
| 3068 | Elf_Internal_Rela rel; |
| 3069 | bfd_byte *loc; |
| 3070 | |
| 3071 | /* This symbol has an entry in the global offset table. Set it |
| 3072 | up. */ |
| 3073 | |
| 3074 | if (htab->sgot == NULL || htab->srelgot == NULL) |
| 3075 | abort (); |
| 3076 | |
| 3077 | rel.r_offset = (htab->sgot->output_section->vma |
| 3078 | + htab->sgot->output_offset |
| 3079 | + (h->got.offset & ~(bfd_vma) 1)); |
| 3080 | |
| 3081 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 3082 | symbol is defined locally or was forced to be local because |
| 3083 | of a version file, we just want to emit a RELATIVE reloc. |
| 3084 | The entry in the global offset table will already have been |
| 3085 | initialized in the relocate_section function. */ |
| 3086 | if (info->shared |
| 3087 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 3088 | { |
| 3089 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 3090 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 3091 | } |
| 3092 | else |
| 3093 | { |
| 3094 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 3095 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
| 3096 | htab->sgot->contents + h->got.offset); |
| 3097 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); |
| 3098 | } |
| 3099 | |
| 3100 | loc = htab->srelgot->contents; |
| 3101 | loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3102 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3103 | } |
| 3104 | |
| 3105 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| 3106 | { |
| 3107 | Elf_Internal_Rela rel; |
| 3108 | bfd_byte *loc; |
| 3109 | |
| 3110 | /* This symbol needs a copy reloc. Set it up. */ |
| 3111 | |
| 3112 | if (h->dynindx == -1 |
| 3113 | || (h->root.type != bfd_link_hash_defined |
| 3114 | && h->root.type != bfd_link_hash_defweak) |
| 3115 | || htab->srelbss == NULL) |
| 3116 | abort (); |
| 3117 | |
| 3118 | rel.r_offset = (h->root.u.def.value |
| 3119 | + h->root.u.def.section->output_section->vma |
| 3120 | + h->root.u.def.section->output_offset); |
| 3121 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); |
| 3122 | loc = htab->srelbss->contents; |
| 3123 | loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3124 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3125 | } |
| 3126 | |
| 3127 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| 3128 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 3129 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 3130 | sym->st_shndx = SHN_ABS; |
| 3131 | |
| 3132 | return TRUE; |
| 3133 | } |
| 3134 | |
| 3135 | /* Used to decide how to sort relocs in an optimal manner for the |
| 3136 | dynamic linker, before writing them out. */ |
| 3137 | |
| 3138 | static enum elf_reloc_type_class |
| 3139 | elf_i386_reloc_type_class (const Elf_Internal_Rela *rela) |
| 3140 | { |
| 3141 | switch (ELF32_R_TYPE (rela->r_info)) |
| 3142 | { |
| 3143 | case R_386_RELATIVE: |
| 3144 | return reloc_class_relative; |
| 3145 | case R_386_JUMP_SLOT: |
| 3146 | return reloc_class_plt; |
| 3147 | case R_386_COPY: |
| 3148 | return reloc_class_copy; |
| 3149 | default: |
| 3150 | return reloc_class_normal; |
| 3151 | } |
| 3152 | } |
| 3153 | |
| 3154 | /* Finish up the dynamic sections. */ |
| 3155 | |
| 3156 | static bfd_boolean |
| 3157 | elf_i386_finish_dynamic_sections (bfd *output_bfd, |
| 3158 | struct bfd_link_info *info) |
| 3159 | { |
| 3160 | struct elf_i386_link_hash_table *htab; |
| 3161 | bfd *dynobj; |
| 3162 | asection *sdyn; |
| 3163 | |
| 3164 | htab = elf_i386_hash_table (info); |
| 3165 | dynobj = htab->elf.dynobj; |
| 3166 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 3167 | |
| 3168 | if (htab->elf.dynamic_sections_created) |
| 3169 | { |
| 3170 | Elf32_External_Dyn *dyncon, *dynconend; |
| 3171 | |
| 3172 | if (sdyn == NULL || htab->sgot == NULL) |
| 3173 | abort (); |
| 3174 | |
| 3175 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 3176 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); |
| 3177 | for (; dyncon < dynconend; dyncon++) |
| 3178 | { |
| 3179 | Elf_Internal_Dyn dyn; |
| 3180 | asection *s; |
| 3181 | |
| 3182 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 3183 | |
| 3184 | switch (dyn.d_tag) |
| 3185 | { |
| 3186 | default: |
| 3187 | continue; |
| 3188 | |
| 3189 | case DT_PLTGOT: |
| 3190 | s = htab->sgotplt; |
| 3191 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 3192 | break; |
| 3193 | |
| 3194 | case DT_JMPREL: |
| 3195 | s = htab->srelplt; |
| 3196 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 3197 | break; |
| 3198 | |
| 3199 | case DT_PLTRELSZ: |
| 3200 | s = htab->srelplt; |
| 3201 | dyn.d_un.d_val = s->size; |
| 3202 | break; |
| 3203 | |
| 3204 | case DT_RELSZ: |
| 3205 | /* My reading of the SVR4 ABI indicates that the |
| 3206 | procedure linkage table relocs (DT_JMPREL) should be |
| 3207 | included in the overall relocs (DT_REL). This is |
| 3208 | what Solaris does. However, UnixWare can not handle |
| 3209 | that case. Therefore, we override the DT_RELSZ entry |
| 3210 | here to make it not include the JMPREL relocs. */ |
| 3211 | s = htab->srelplt; |
| 3212 | if (s == NULL) |
| 3213 | continue; |
| 3214 | dyn.d_un.d_val -= s->size; |
| 3215 | break; |
| 3216 | |
| 3217 | case DT_REL: |
| 3218 | /* We may not be using the standard ELF linker script. |
| 3219 | If .rel.plt is the first .rel section, we adjust |
| 3220 | DT_REL to not include it. */ |
| 3221 | s = htab->srelplt; |
| 3222 | if (s == NULL) |
| 3223 | continue; |
| 3224 | if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) |
| 3225 | continue; |
| 3226 | dyn.d_un.d_ptr += s->size; |
| 3227 | break; |
| 3228 | } |
| 3229 | |
| 3230 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 3231 | } |
| 3232 | |
| 3233 | /* Fill in the first entry in the procedure linkage table. */ |
| 3234 | if (htab->splt && htab->splt->size > 0) |
| 3235 | { |
| 3236 | if (info->shared) |
| 3237 | memcpy (htab->splt->contents, |
| 3238 | elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE); |
| 3239 | else |
| 3240 | { |
| 3241 | memcpy (htab->splt->contents, |
| 3242 | elf_i386_plt0_entry, PLT_ENTRY_SIZE); |
| 3243 | bfd_put_32 (output_bfd, |
| 3244 | (htab->sgotplt->output_section->vma |
| 3245 | + htab->sgotplt->output_offset |
| 3246 | + 4), |
| 3247 | htab->splt->contents + 2); |
| 3248 | bfd_put_32 (output_bfd, |
| 3249 | (htab->sgotplt->output_section->vma |
| 3250 | + htab->sgotplt->output_offset |
| 3251 | + 8), |
| 3252 | htab->splt->contents + 8); |
| 3253 | } |
| 3254 | |
| 3255 | /* UnixWare sets the entsize of .plt to 4, although that doesn't |
| 3256 | really seem like the right value. */ |
| 3257 | elf_section_data (htab->splt->output_section) |
| 3258 | ->this_hdr.sh_entsize = 4; |
| 3259 | } |
| 3260 | } |
| 3261 | |
| 3262 | if (htab->sgotplt) |
| 3263 | { |
| 3264 | /* Fill in the first three entries in the global offset table. */ |
| 3265 | if (htab->sgotplt->size > 0) |
| 3266 | { |
| 3267 | bfd_put_32 (output_bfd, |
| 3268 | (sdyn == NULL ? 0 |
| 3269 | : sdyn->output_section->vma + sdyn->output_offset), |
| 3270 | htab->sgotplt->contents); |
| 3271 | bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4); |
| 3272 | bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8); |
| 3273 | } |
| 3274 | |
| 3275 | elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4; |
| 3276 | } |
| 3277 | |
| 3278 | if (htab->sgot && htab->sgot->size > 0) |
| 3279 | elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4; |
| 3280 | |
| 3281 | return TRUE; |
| 3282 | } |
| 3283 | |
| 3284 | /* Return address for Ith PLT stub in section PLT, for relocation REL |
| 3285 | or (bfd_vma) -1 if it should not be included. */ |
| 3286 | |
| 3287 | static bfd_vma |
| 3288 | elf_i386_plt_sym_val (bfd_vma i, const asection *plt, |
| 3289 | const arelent *rel ATTRIBUTE_UNUSED) |
| 3290 | { |
| 3291 | return plt->vma + (i + 1) * PLT_ENTRY_SIZE; |
| 3292 | } |
| 3293 | |
| 3294 | |
| 3295 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec |
| 3296 | #define TARGET_LITTLE_NAME "elf32-i386" |
| 3297 | #define ELF_ARCH bfd_arch_i386 |
| 3298 | #define ELF_MACHINE_CODE EM_386 |
| 3299 | #define ELF_MAXPAGESIZE 0x1000 |
| 3300 | |
| 3301 | #define elf_backend_can_gc_sections 1 |
| 3302 | #define elf_backend_can_refcount 1 |
| 3303 | #define elf_backend_want_got_plt 1 |
| 3304 | #define elf_backend_plt_readonly 1 |
| 3305 | #define elf_backend_want_plt_sym 0 |
| 3306 | #define elf_backend_got_header_size 12 |
| 3307 | |
| 3308 | /* Support RELA for objdump of prelink objects. */ |
| 3309 | #define elf_info_to_howto elf_i386_info_to_howto_rel |
| 3310 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel |
| 3311 | |
| 3312 | #define bfd_elf32_mkobject elf_i386_mkobject |
| 3313 | |
| 3314 | #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name |
| 3315 | #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create |
| 3316 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup |
| 3317 | |
| 3318 | #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol |
| 3319 | #define elf_backend_check_relocs elf_i386_check_relocs |
| 3320 | #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol |
| 3321 | #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections |
| 3322 | #define elf_backend_fake_sections elf_i386_fake_sections |
| 3323 | #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections |
| 3324 | #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol |
| 3325 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook |
| 3326 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook |
| 3327 | #define elf_backend_grok_prstatus elf_i386_grok_prstatus |
| 3328 | #define elf_backend_grok_psinfo elf_i386_grok_psinfo |
| 3329 | #define elf_backend_reloc_type_class elf_i386_reloc_type_class |
| 3330 | #define elf_backend_relocate_section elf_i386_relocate_section |
| 3331 | #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections |
| 3332 | #define elf_backend_plt_sym_val elf_i386_plt_sym_val |
| 3333 | |
| 3334 | #include "elf32-target.h" |
| 3335 | |
| 3336 | /* FreeBSD support. */ |
| 3337 | |
| 3338 | #undef TARGET_LITTLE_SYM |
| 3339 | #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec |
| 3340 | #undef TARGET_LITTLE_NAME |
| 3341 | #define TARGET_LITTLE_NAME "elf32-i386-freebsd" |
| 3342 | |
| 3343 | /* The kernel recognizes executables as valid only if they carry a |
| 3344 | "FreeBSD" label in the ELF header. So we put this label on all |
| 3345 | executables and (for simplicity) also all other object files. */ |
| 3346 | |
| 3347 | static void |
| 3348 | elf_i386_post_process_headers (bfd *abfd, |
| 3349 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 3350 | { |
| 3351 | Elf_Internal_Ehdr *i_ehdrp; |
| 3352 | |
| 3353 | i_ehdrp = elf_elfheader (abfd); |
| 3354 | |
| 3355 | /* Put an ABI label supported by FreeBSD >= 4.1. */ |
| 3356 | i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; |
| 3357 | #ifdef OLD_FREEBSD_ABI_LABEL |
| 3358 | /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ |
| 3359 | memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); |
| 3360 | #endif |
| 3361 | } |
| 3362 | |
| 3363 | #undef elf_backend_post_process_headers |
| 3364 | #define elf_backend_post_process_headers elf_i386_post_process_headers |
| 3365 | #undef elf32_bed |
| 3366 | #define elf32_bed elf32_i386_fbsd_bed |
| 3367 | |
| 3368 | #include "elf32-target.h" |