| 1 | /* Intel 80386/80486-specific support for 32-bit ELF |
| 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, |
| 3 | 2003, 2004, 2005, 2006 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 20 | |
| 21 | #include "bfd.h" |
| 22 | #include "sysdep.h" |
| 23 | #include "bfdlink.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "elf-bfd.h" |
| 26 | #include "elf-vxworks.h" |
| 27 | |
| 28 | /* 386 uses REL relocations instead of RELA. */ |
| 29 | #define USE_REL 1 |
| 30 | |
| 31 | #include "elf/i386.h" |
| 32 | |
| 33 | static reloc_howto_type elf_howto_table[]= |
| 34 | { |
| 35 | HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield, |
| 36 | bfd_elf_generic_reloc, "R_386_NONE", |
| 37 | TRUE, 0x00000000, 0x00000000, FALSE), |
| 38 | HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 39 | bfd_elf_generic_reloc, "R_386_32", |
| 40 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 41 | HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 42 | bfd_elf_generic_reloc, "R_386_PC32", |
| 43 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 44 | HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 45 | bfd_elf_generic_reloc, "R_386_GOT32", |
| 46 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 47 | HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 48 | bfd_elf_generic_reloc, "R_386_PLT32", |
| 49 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 50 | HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 51 | bfd_elf_generic_reloc, "R_386_COPY", |
| 52 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 53 | HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 54 | bfd_elf_generic_reloc, "R_386_GLOB_DAT", |
| 55 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 56 | HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 57 | bfd_elf_generic_reloc, "R_386_JUMP_SLOT", |
| 58 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 59 | HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 60 | bfd_elf_generic_reloc, "R_386_RELATIVE", |
| 61 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 62 | HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 63 | bfd_elf_generic_reloc, "R_386_GOTOFF", |
| 64 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 65 | HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 66 | bfd_elf_generic_reloc, "R_386_GOTPC", |
| 67 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 68 | |
| 69 | /* We have a gap in the reloc numbers here. |
| 70 | R_386_standard counts the number up to this point, and |
| 71 | R_386_ext_offset is the value to subtract from a reloc type of |
| 72 | R_386_16 thru R_386_PC8 to form an index into this table. */ |
| 73 | #define R_386_standard (R_386_GOTPC + 1) |
| 74 | #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard) |
| 75 | |
| 76 | /* These relocs are a GNU extension. */ |
| 77 | HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 78 | bfd_elf_generic_reloc, "R_386_TLS_TPOFF", |
| 79 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 80 | HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 81 | bfd_elf_generic_reloc, "R_386_TLS_IE", |
| 82 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 83 | HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 84 | bfd_elf_generic_reloc, "R_386_TLS_GOTIE", |
| 85 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 86 | HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 87 | bfd_elf_generic_reloc, "R_386_TLS_LE", |
| 88 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 89 | HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 90 | bfd_elf_generic_reloc, "R_386_TLS_GD", |
| 91 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 92 | HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 93 | bfd_elf_generic_reloc, "R_386_TLS_LDM", |
| 94 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 95 | HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, |
| 96 | bfd_elf_generic_reloc, "R_386_16", |
| 97 | TRUE, 0xffff, 0xffff, FALSE), |
| 98 | HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, |
| 99 | bfd_elf_generic_reloc, "R_386_PC16", |
| 100 | TRUE, 0xffff, 0xffff, TRUE), |
| 101 | HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, |
| 102 | bfd_elf_generic_reloc, "R_386_8", |
| 103 | TRUE, 0xff, 0xff, FALSE), |
| 104 | HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, |
| 105 | bfd_elf_generic_reloc, "R_386_PC8", |
| 106 | TRUE, 0xff, 0xff, TRUE), |
| 107 | |
| 108 | #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset) |
| 109 | #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext) |
| 110 | /* These are common with Solaris TLS implementation. */ |
| 111 | HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 112 | bfd_elf_generic_reloc, "R_386_TLS_LDO_32", |
| 113 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 114 | HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 115 | bfd_elf_generic_reloc, "R_386_TLS_IE_32", |
| 116 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 117 | HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 118 | bfd_elf_generic_reloc, "R_386_TLS_LE_32", |
| 119 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 120 | HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 121 | bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32", |
| 122 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 123 | HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 124 | bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32", |
| 125 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 126 | HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 127 | bfd_elf_generic_reloc, "R_386_TLS_TPOFF32", |
| 128 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 129 | EMPTY_HOWTO (38), |
| 130 | HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 131 | bfd_elf_generic_reloc, "R_386_TLS_GOTDESC", |
| 132 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 133 | HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, |
| 134 | bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL", |
| 135 | FALSE, 0, 0, FALSE), |
| 136 | HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 137 | bfd_elf_generic_reloc, "R_386_TLS_DESC", |
| 138 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 139 | |
| 140 | /* Another gap. */ |
| 141 | #define R_386_tls (R_386_TLS_DESC + 1 - R_386_tls_offset) |
| 142 | #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls) |
| 143 | |
| 144 | /* GNU extension to record C++ vtable hierarchy. */ |
| 145 | HOWTO (R_386_GNU_VTINHERIT, /* type */ |
| 146 | 0, /* rightshift */ |
| 147 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 148 | 0, /* bitsize */ |
| 149 | FALSE, /* pc_relative */ |
| 150 | 0, /* bitpos */ |
| 151 | complain_overflow_dont, /* complain_on_overflow */ |
| 152 | NULL, /* special_function */ |
| 153 | "R_386_GNU_VTINHERIT", /* name */ |
| 154 | FALSE, /* partial_inplace */ |
| 155 | 0, /* src_mask */ |
| 156 | 0, /* dst_mask */ |
| 157 | FALSE), /* pcrel_offset */ |
| 158 | |
| 159 | /* GNU extension to record C++ vtable member usage. */ |
| 160 | HOWTO (R_386_GNU_VTENTRY, /* type */ |
| 161 | 0, /* rightshift */ |
| 162 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 163 | 0, /* bitsize */ |
| 164 | FALSE, /* pc_relative */ |
| 165 | 0, /* bitpos */ |
| 166 | complain_overflow_dont, /* complain_on_overflow */ |
| 167 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 168 | "R_386_GNU_VTENTRY", /* name */ |
| 169 | FALSE, /* partial_inplace */ |
| 170 | 0, /* src_mask */ |
| 171 | 0, /* dst_mask */ |
| 172 | FALSE) /* pcrel_offset */ |
| 173 | |
| 174 | #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset) |
| 175 | |
| 176 | }; |
| 177 | |
| 178 | #ifdef DEBUG_GEN_RELOC |
| 179 | #define TRACE(str) \ |
| 180 | fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) |
| 181 | #else |
| 182 | #define TRACE(str) |
| 183 | #endif |
| 184 | |
| 185 | static reloc_howto_type * |
| 186 | elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 187 | bfd_reloc_code_real_type code) |
| 188 | { |
| 189 | switch (code) |
| 190 | { |
| 191 | case BFD_RELOC_NONE: |
| 192 | TRACE ("BFD_RELOC_NONE"); |
| 193 | return &elf_howto_table[R_386_NONE]; |
| 194 | |
| 195 | case BFD_RELOC_32: |
| 196 | TRACE ("BFD_RELOC_32"); |
| 197 | return &elf_howto_table[R_386_32]; |
| 198 | |
| 199 | case BFD_RELOC_CTOR: |
| 200 | TRACE ("BFD_RELOC_CTOR"); |
| 201 | return &elf_howto_table[R_386_32]; |
| 202 | |
| 203 | case BFD_RELOC_32_PCREL: |
| 204 | TRACE ("BFD_RELOC_PC32"); |
| 205 | return &elf_howto_table[R_386_PC32]; |
| 206 | |
| 207 | case BFD_RELOC_386_GOT32: |
| 208 | TRACE ("BFD_RELOC_386_GOT32"); |
| 209 | return &elf_howto_table[R_386_GOT32]; |
| 210 | |
| 211 | case BFD_RELOC_386_PLT32: |
| 212 | TRACE ("BFD_RELOC_386_PLT32"); |
| 213 | return &elf_howto_table[R_386_PLT32]; |
| 214 | |
| 215 | case BFD_RELOC_386_COPY: |
| 216 | TRACE ("BFD_RELOC_386_COPY"); |
| 217 | return &elf_howto_table[R_386_COPY]; |
| 218 | |
| 219 | case BFD_RELOC_386_GLOB_DAT: |
| 220 | TRACE ("BFD_RELOC_386_GLOB_DAT"); |
| 221 | return &elf_howto_table[R_386_GLOB_DAT]; |
| 222 | |
| 223 | case BFD_RELOC_386_JUMP_SLOT: |
| 224 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); |
| 225 | return &elf_howto_table[R_386_JUMP_SLOT]; |
| 226 | |
| 227 | case BFD_RELOC_386_RELATIVE: |
| 228 | TRACE ("BFD_RELOC_386_RELATIVE"); |
| 229 | return &elf_howto_table[R_386_RELATIVE]; |
| 230 | |
| 231 | case BFD_RELOC_386_GOTOFF: |
| 232 | TRACE ("BFD_RELOC_386_GOTOFF"); |
| 233 | return &elf_howto_table[R_386_GOTOFF]; |
| 234 | |
| 235 | case BFD_RELOC_386_GOTPC: |
| 236 | TRACE ("BFD_RELOC_386_GOTPC"); |
| 237 | return &elf_howto_table[R_386_GOTPC]; |
| 238 | |
| 239 | /* These relocs are a GNU extension. */ |
| 240 | case BFD_RELOC_386_TLS_TPOFF: |
| 241 | TRACE ("BFD_RELOC_386_TLS_TPOFF"); |
| 242 | return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset]; |
| 243 | |
| 244 | case BFD_RELOC_386_TLS_IE: |
| 245 | TRACE ("BFD_RELOC_386_TLS_IE"); |
| 246 | return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset]; |
| 247 | |
| 248 | case BFD_RELOC_386_TLS_GOTIE: |
| 249 | TRACE ("BFD_RELOC_386_TLS_GOTIE"); |
| 250 | return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset]; |
| 251 | |
| 252 | case BFD_RELOC_386_TLS_LE: |
| 253 | TRACE ("BFD_RELOC_386_TLS_LE"); |
| 254 | return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset]; |
| 255 | |
| 256 | case BFD_RELOC_386_TLS_GD: |
| 257 | TRACE ("BFD_RELOC_386_TLS_GD"); |
| 258 | return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset]; |
| 259 | |
| 260 | case BFD_RELOC_386_TLS_LDM: |
| 261 | TRACE ("BFD_RELOC_386_TLS_LDM"); |
| 262 | return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset]; |
| 263 | |
| 264 | case BFD_RELOC_16: |
| 265 | TRACE ("BFD_RELOC_16"); |
| 266 | return &elf_howto_table[R_386_16 - R_386_ext_offset]; |
| 267 | |
| 268 | case BFD_RELOC_16_PCREL: |
| 269 | TRACE ("BFD_RELOC_16_PCREL"); |
| 270 | return &elf_howto_table[R_386_PC16 - R_386_ext_offset]; |
| 271 | |
| 272 | case BFD_RELOC_8: |
| 273 | TRACE ("BFD_RELOC_8"); |
| 274 | return &elf_howto_table[R_386_8 - R_386_ext_offset]; |
| 275 | |
| 276 | case BFD_RELOC_8_PCREL: |
| 277 | TRACE ("BFD_RELOC_8_PCREL"); |
| 278 | return &elf_howto_table[R_386_PC8 - R_386_ext_offset]; |
| 279 | |
| 280 | /* Common with Sun TLS implementation. */ |
| 281 | case BFD_RELOC_386_TLS_LDO_32: |
| 282 | TRACE ("BFD_RELOC_386_TLS_LDO_32"); |
| 283 | return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset]; |
| 284 | |
| 285 | case BFD_RELOC_386_TLS_IE_32: |
| 286 | TRACE ("BFD_RELOC_386_TLS_IE_32"); |
| 287 | return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset]; |
| 288 | |
| 289 | case BFD_RELOC_386_TLS_LE_32: |
| 290 | TRACE ("BFD_RELOC_386_TLS_LE_32"); |
| 291 | return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset]; |
| 292 | |
| 293 | case BFD_RELOC_386_TLS_DTPMOD32: |
| 294 | TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); |
| 295 | return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset]; |
| 296 | |
| 297 | case BFD_RELOC_386_TLS_DTPOFF32: |
| 298 | TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); |
| 299 | return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset]; |
| 300 | |
| 301 | case BFD_RELOC_386_TLS_TPOFF32: |
| 302 | TRACE ("BFD_RELOC_386_TLS_TPOFF32"); |
| 303 | return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset]; |
| 304 | |
| 305 | case BFD_RELOC_386_TLS_GOTDESC: |
| 306 | TRACE ("BFD_RELOC_386_TLS_GOTDESC"); |
| 307 | return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset]; |
| 308 | |
| 309 | case BFD_RELOC_386_TLS_DESC_CALL: |
| 310 | TRACE ("BFD_RELOC_386_TLS_DESC_CALL"); |
| 311 | return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset]; |
| 312 | |
| 313 | case BFD_RELOC_386_TLS_DESC: |
| 314 | TRACE ("BFD_RELOC_386_TLS_DESC"); |
| 315 | return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset]; |
| 316 | |
| 317 | case BFD_RELOC_VTABLE_INHERIT: |
| 318 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); |
| 319 | return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset]; |
| 320 | |
| 321 | case BFD_RELOC_VTABLE_ENTRY: |
| 322 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); |
| 323 | return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset]; |
| 324 | |
| 325 | default: |
| 326 | break; |
| 327 | } |
| 328 | |
| 329 | TRACE ("Unknown"); |
| 330 | return 0; |
| 331 | } |
| 332 | |
| 333 | static void |
| 334 | elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, |
| 335 | arelent *cache_ptr, |
| 336 | Elf_Internal_Rela *dst) |
| 337 | { |
| 338 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
| 339 | unsigned int indx; |
| 340 | |
| 341 | if ((indx = r_type) >= R_386_standard |
| 342 | && ((indx = r_type - R_386_ext_offset) - R_386_standard |
| 343 | >= R_386_ext - R_386_standard) |
| 344 | && ((indx = r_type - R_386_tls_offset) - R_386_ext |
| 345 | >= R_386_tls - R_386_ext) |
| 346 | && ((indx = r_type - R_386_vt_offset) - R_386_tls |
| 347 | >= R_386_vt - R_386_tls)) |
| 348 | { |
| 349 | (*_bfd_error_handler) (_("%B: invalid relocation type %d"), |
| 350 | abfd, (int) r_type); |
| 351 | indx = R_386_NONE; |
| 352 | } |
| 353 | cache_ptr->howto = &elf_howto_table[indx]; |
| 354 | } |
| 355 | |
| 356 | /* Return whether a symbol name implies a local label. The UnixWare |
| 357 | 2.1 cc generates temporary symbols that start with .X, so we |
| 358 | recognize them here. FIXME: do other SVR4 compilers also use .X?. |
| 359 | If so, we should move the .X recognition into |
| 360 | _bfd_elf_is_local_label_name. */ |
| 361 | |
| 362 | static bfd_boolean |
| 363 | elf_i386_is_local_label_name (bfd *abfd, const char *name) |
| 364 | { |
| 365 | if (name[0] == '.' && name[1] == 'X') |
| 366 | return TRUE; |
| 367 | |
| 368 | return _bfd_elf_is_local_label_name (abfd, name); |
| 369 | } |
| 370 | \f |
| 371 | /* Support for core dump NOTE sections. */ |
| 372 | |
| 373 | static bfd_boolean |
| 374 | elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 375 | { |
| 376 | int offset; |
| 377 | size_t size; |
| 378 | |
| 379 | if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) |
| 380 | { |
| 381 | int pr_version = bfd_get_32 (abfd, note->descdata); |
| 382 | |
| 383 | if (pr_version != 1) |
| 384 | return FALSE; |
| 385 | |
| 386 | /* pr_cursig */ |
| 387 | elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20); |
| 388 | |
| 389 | /* pr_pid */ |
| 390 | elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); |
| 391 | |
| 392 | /* pr_reg */ |
| 393 | offset = 28; |
| 394 | size = bfd_get_32 (abfd, note->descdata + 8); |
| 395 | } |
| 396 | else |
| 397 | { |
| 398 | switch (note->descsz) |
| 399 | { |
| 400 | default: |
| 401 | return FALSE; |
| 402 | |
| 403 | case 144: /* Linux/i386 */ |
| 404 | /* pr_cursig */ |
| 405 | elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); |
| 406 | |
| 407 | /* pr_pid */ |
| 408 | elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); |
| 409 | |
| 410 | /* pr_reg */ |
| 411 | offset = 72; |
| 412 | size = 68; |
| 413 | |
| 414 | break; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | /* Make a ".reg/999" section. */ |
| 419 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 420 | size, note->descpos + offset); |
| 421 | } |
| 422 | |
| 423 | static bfd_boolean |
| 424 | elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 425 | { |
| 426 | if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) |
| 427 | { |
| 428 | int pr_version = bfd_get_32 (abfd, note->descdata); |
| 429 | |
| 430 | if (pr_version != 1) |
| 431 | return FALSE; |
| 432 | |
| 433 | elf_tdata (abfd)->core_program |
| 434 | = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); |
| 435 | elf_tdata (abfd)->core_command |
| 436 | = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); |
| 437 | } |
| 438 | else |
| 439 | { |
| 440 | switch (note->descsz) |
| 441 | { |
| 442 | default: |
| 443 | return FALSE; |
| 444 | |
| 445 | case 124: /* Linux/i386 elf_prpsinfo. */ |
| 446 | elf_tdata (abfd)->core_program |
| 447 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); |
| 448 | elf_tdata (abfd)->core_command |
| 449 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | /* Note that for some reason, a spurious space is tacked |
| 454 | onto the end of the args in some (at least one anyway) |
| 455 | implementations, so strip it off if it exists. */ |
| 456 | { |
| 457 | char *command = elf_tdata (abfd)->core_command; |
| 458 | int n = strlen (command); |
| 459 | |
| 460 | if (0 < n && command[n - 1] == ' ') |
| 461 | command[n - 1] = '\0'; |
| 462 | } |
| 463 | |
| 464 | return TRUE; |
| 465 | } |
| 466 | \f |
| 467 | /* Functions for the i386 ELF linker. |
| 468 | |
| 469 | In order to gain some understanding of code in this file without |
| 470 | knowing all the intricate details of the linker, note the |
| 471 | following: |
| 472 | |
| 473 | Functions named elf_i386_* are called by external routines, other |
| 474 | functions are only called locally. elf_i386_* functions appear |
| 475 | in this file more or less in the order in which they are called |
| 476 | from external routines. eg. elf_i386_check_relocs is called |
| 477 | early in the link process, elf_i386_finish_dynamic_sections is |
| 478 | one of the last functions. */ |
| 479 | |
| 480 | |
| 481 | /* The name of the dynamic interpreter. This is put in the .interp |
| 482 | section. */ |
| 483 | |
| 484 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" |
| 485 | |
| 486 | /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid |
| 487 | copying dynamic variables from a shared lib into an app's dynbss |
| 488 | section, and instead use a dynamic relocation to point into the |
| 489 | shared lib. */ |
| 490 | #define ELIMINATE_COPY_RELOCS 1 |
| 491 | |
| 492 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 493 | |
| 494 | #define PLT_ENTRY_SIZE 16 |
| 495 | |
| 496 | /* The first entry in an absolute procedure linkage table looks like |
| 497 | this. See the SVR4 ABI i386 supplement to see how this works. |
| 498 | Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ |
| 499 | |
| 500 | static const bfd_byte elf_i386_plt0_entry[12] = |
| 501 | { |
| 502 | 0xff, 0x35, /* pushl contents of address */ |
| 503 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ |
| 504 | 0xff, 0x25, /* jmp indirect */ |
| 505 | 0, 0, 0, 0 /* replaced with address of .got + 8. */ |
| 506 | }; |
| 507 | |
| 508 | /* Subsequent entries in an absolute procedure linkage table look like |
| 509 | this. */ |
| 510 | |
| 511 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = |
| 512 | { |
| 513 | 0xff, 0x25, /* jmp indirect */ |
| 514 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ |
| 515 | 0x68, /* pushl immediate */ |
| 516 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 517 | 0xe9, /* jmp relative */ |
| 518 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 519 | }; |
| 520 | |
| 521 | /* The first entry in a PIC procedure linkage table look like this. |
| 522 | Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ |
| 523 | |
| 524 | static const bfd_byte elf_i386_pic_plt0_entry[12] = |
| 525 | { |
| 526 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ |
| 527 | 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */ |
| 528 | }; |
| 529 | |
| 530 | /* Subsequent entries in a PIC procedure linkage table look like this. */ |
| 531 | |
| 532 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = |
| 533 | { |
| 534 | 0xff, 0xa3, /* jmp *offset(%ebx) */ |
| 535 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ |
| 536 | 0x68, /* pushl immediate */ |
| 537 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 538 | 0xe9, /* jmp relative */ |
| 539 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 540 | }; |
| 541 | |
| 542 | /* On VxWorks, the .rel.plt.unloaded section has absolute relocations |
| 543 | for the PLTResolve stub and then for each PLT entry. */ |
| 544 | #define PLTRESOLVE_RELOCS_SHLIB 0 |
| 545 | #define PLTRESOLVE_RELOCS 2 |
| 546 | #define PLT_NON_JUMP_SLOT_RELOCS 2 |
| 547 | |
| 548 | /* The i386 linker needs to keep track of the number of relocs that it |
| 549 | decides to copy as dynamic relocs in check_relocs for each symbol. |
| 550 | This is so that it can later discard them if they are found to be |
| 551 | unnecessary. We store the information in a field extending the |
| 552 | regular ELF linker hash table. */ |
| 553 | |
| 554 | struct elf_i386_dyn_relocs |
| 555 | { |
| 556 | struct elf_i386_dyn_relocs *next; |
| 557 | |
| 558 | /* The input section of the reloc. */ |
| 559 | asection *sec; |
| 560 | |
| 561 | /* Total number of relocs copied for the input section. */ |
| 562 | bfd_size_type count; |
| 563 | |
| 564 | /* Number of pc-relative relocs copied for the input section. */ |
| 565 | bfd_size_type pc_count; |
| 566 | }; |
| 567 | |
| 568 | /* i386 ELF linker hash entry. */ |
| 569 | |
| 570 | struct elf_i386_link_hash_entry |
| 571 | { |
| 572 | struct elf_link_hash_entry elf; |
| 573 | |
| 574 | /* Track dynamic relocs copied for this symbol. */ |
| 575 | struct elf_i386_dyn_relocs *dyn_relocs; |
| 576 | |
| 577 | #define GOT_UNKNOWN 0 |
| 578 | #define GOT_NORMAL 1 |
| 579 | #define GOT_TLS_GD 2 |
| 580 | #define GOT_TLS_IE 4 |
| 581 | #define GOT_TLS_IE_POS 5 |
| 582 | #define GOT_TLS_IE_NEG 6 |
| 583 | #define GOT_TLS_IE_BOTH 7 |
| 584 | #define GOT_TLS_GDESC 8 |
| 585 | #define GOT_TLS_GD_BOTH_P(type) \ |
| 586 | ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) |
| 587 | #define GOT_TLS_GD_P(type) \ |
| 588 | ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) |
| 589 | #define GOT_TLS_GDESC_P(type) \ |
| 590 | ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) |
| 591 | #define GOT_TLS_GD_ANY_P(type) \ |
| 592 | (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) |
| 593 | unsigned char tls_type; |
| 594 | |
| 595 | /* Offset of the GOTPLT entry reserved for the TLS descriptor, |
| 596 | starting at the end of the jump table. */ |
| 597 | bfd_vma tlsdesc_got; |
| 598 | }; |
| 599 | |
| 600 | #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent)) |
| 601 | |
| 602 | struct elf_i386_obj_tdata |
| 603 | { |
| 604 | struct elf_obj_tdata root; |
| 605 | |
| 606 | /* tls_type for each local got entry. */ |
| 607 | char *local_got_tls_type; |
| 608 | |
| 609 | /* GOTPLT entries for TLS descriptors. */ |
| 610 | bfd_vma *local_tlsdesc_gotent; |
| 611 | }; |
| 612 | |
| 613 | #define elf_i386_tdata(abfd) \ |
| 614 | ((struct elf_i386_obj_tdata *) (abfd)->tdata.any) |
| 615 | |
| 616 | #define elf_i386_local_got_tls_type(abfd) \ |
| 617 | (elf_i386_tdata (abfd)->local_got_tls_type) |
| 618 | |
| 619 | #define elf_i386_local_tlsdesc_gotent(abfd) \ |
| 620 | (elf_i386_tdata (abfd)->local_tlsdesc_gotent) |
| 621 | |
| 622 | static bfd_boolean |
| 623 | elf_i386_mkobject (bfd *abfd) |
| 624 | { |
| 625 | bfd_size_type amt = sizeof (struct elf_i386_obj_tdata); |
| 626 | abfd->tdata.any = bfd_zalloc (abfd, amt); |
| 627 | if (abfd->tdata.any == NULL) |
| 628 | return FALSE; |
| 629 | return TRUE; |
| 630 | } |
| 631 | |
| 632 | /* i386 ELF linker hash table. */ |
| 633 | |
| 634 | struct elf_i386_link_hash_table |
| 635 | { |
| 636 | struct elf_link_hash_table elf; |
| 637 | |
| 638 | /* Short-cuts to get to dynamic linker sections. */ |
| 639 | asection *sgot; |
| 640 | asection *sgotplt; |
| 641 | asection *srelgot; |
| 642 | asection *splt; |
| 643 | asection *srelplt; |
| 644 | asection *sdynbss; |
| 645 | asection *srelbss; |
| 646 | |
| 647 | /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */ |
| 648 | asection *srelplt2; |
| 649 | |
| 650 | /* Short-cuts to frequently used symbols for VxWorks targets. */ |
| 651 | struct elf_link_hash_entry *hgot, *hplt; |
| 652 | |
| 653 | /* True if the target system is VxWorks. */ |
| 654 | int is_vxworks; |
| 655 | |
| 656 | /* Value used to fill the last word of the first plt entry. */ |
| 657 | bfd_byte plt0_pad_byte; |
| 658 | |
| 659 | union { |
| 660 | bfd_signed_vma refcount; |
| 661 | bfd_vma offset; |
| 662 | } tls_ldm_got; |
| 663 | |
| 664 | /* The amount of space used by the reserved portion of the sgotplt |
| 665 | section, plus whatever space is used by the jump slots. */ |
| 666 | bfd_vma sgotplt_jump_table_size; |
| 667 | |
| 668 | /* Small local sym to section mapping cache. */ |
| 669 | struct sym_sec_cache sym_sec; |
| 670 | }; |
| 671 | |
| 672 | /* Get the i386 ELF linker hash table from a link_info structure. */ |
| 673 | |
| 674 | #define elf_i386_hash_table(p) \ |
| 675 | ((struct elf_i386_link_hash_table *) ((p)->hash)) |
| 676 | |
| 677 | #define elf_i386_compute_jump_table_size(htab) \ |
| 678 | ((htab)->srelplt->reloc_count * 4) |
| 679 | |
| 680 | /* Create an entry in an i386 ELF linker hash table. */ |
| 681 | |
| 682 | static struct bfd_hash_entry * |
| 683 | link_hash_newfunc (struct bfd_hash_entry *entry, |
| 684 | struct bfd_hash_table *table, |
| 685 | const char *string) |
| 686 | { |
| 687 | /* Allocate the structure if it has not already been allocated by a |
| 688 | subclass. */ |
| 689 | if (entry == NULL) |
| 690 | { |
| 691 | entry = bfd_hash_allocate (table, |
| 692 | sizeof (struct elf_i386_link_hash_entry)); |
| 693 | if (entry == NULL) |
| 694 | return entry; |
| 695 | } |
| 696 | |
| 697 | /* Call the allocation method of the superclass. */ |
| 698 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 699 | if (entry != NULL) |
| 700 | { |
| 701 | struct elf_i386_link_hash_entry *eh; |
| 702 | |
| 703 | eh = (struct elf_i386_link_hash_entry *) entry; |
| 704 | eh->dyn_relocs = NULL; |
| 705 | eh->tls_type = GOT_UNKNOWN; |
| 706 | eh->tlsdesc_got = (bfd_vma) -1; |
| 707 | } |
| 708 | |
| 709 | return entry; |
| 710 | } |
| 711 | |
| 712 | /* Create an i386 ELF linker hash table. */ |
| 713 | |
| 714 | static struct bfd_link_hash_table * |
| 715 | elf_i386_link_hash_table_create (bfd *abfd) |
| 716 | { |
| 717 | struct elf_i386_link_hash_table *ret; |
| 718 | bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); |
| 719 | |
| 720 | ret = bfd_malloc (amt); |
| 721 | if (ret == NULL) |
| 722 | return NULL; |
| 723 | |
| 724 | if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc)) |
| 725 | { |
| 726 | free (ret); |
| 727 | return NULL; |
| 728 | } |
| 729 | |
| 730 | ret->sgot = NULL; |
| 731 | ret->sgotplt = NULL; |
| 732 | ret->srelgot = NULL; |
| 733 | ret->splt = NULL; |
| 734 | ret->srelplt = NULL; |
| 735 | ret->sdynbss = NULL; |
| 736 | ret->srelbss = NULL; |
| 737 | ret->tls_ldm_got.refcount = 0; |
| 738 | ret->sgotplt_jump_table_size = 0; |
| 739 | ret->sym_sec.abfd = NULL; |
| 740 | ret->is_vxworks = 0; |
| 741 | ret->srelplt2 = NULL; |
| 742 | ret->hgot = NULL; |
| 743 | ret->hplt = NULL; |
| 744 | ret->plt0_pad_byte = 0; |
| 745 | |
| 746 | return &ret->elf.root; |
| 747 | } |
| 748 | |
| 749 | /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up |
| 750 | shortcuts to them in our hash table. */ |
| 751 | |
| 752 | static bfd_boolean |
| 753 | create_got_section (bfd *dynobj, struct bfd_link_info *info) |
| 754 | { |
| 755 | struct elf_i386_link_hash_table *htab; |
| 756 | |
| 757 | if (! _bfd_elf_create_got_section (dynobj, info)) |
| 758 | return FALSE; |
| 759 | |
| 760 | htab = elf_i386_hash_table (info); |
| 761 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 762 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 763 | if (!htab->sgot || !htab->sgotplt) |
| 764 | abort (); |
| 765 | |
| 766 | htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got", |
| 767 | (SEC_ALLOC | SEC_LOAD |
| 768 | | SEC_HAS_CONTENTS |
| 769 | | SEC_IN_MEMORY |
| 770 | | SEC_LINKER_CREATED |
| 771 | | SEC_READONLY)); |
| 772 | if (htab->srelgot == NULL |
| 773 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) |
| 774 | return FALSE; |
| 775 | return TRUE; |
| 776 | } |
| 777 | |
| 778 | /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and |
| 779 | .rel.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 780 | hash table. */ |
| 781 | |
| 782 | static bfd_boolean |
| 783 | elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) |
| 784 | { |
| 785 | struct elf_i386_link_hash_table *htab; |
| 786 | asection * s; |
| 787 | int flags; |
| 788 | const struct elf_backend_data *bed = get_elf_backend_data (dynobj); |
| 789 | |
| 790 | htab = elf_i386_hash_table (info); |
| 791 | if (!htab->sgot && !create_got_section (dynobj, info)) |
| 792 | return FALSE; |
| 793 | |
| 794 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 795 | return FALSE; |
| 796 | |
| 797 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 798 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); |
| 799 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 800 | if (!info->shared) |
| 801 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); |
| 802 | |
| 803 | if (!htab->splt || !htab->srelplt || !htab->sdynbss |
| 804 | || (!info->shared && !htab->srelbss)) |
| 805 | abort (); |
| 806 | |
| 807 | if (htab->is_vxworks && !info->shared) |
| 808 | { |
| 809 | s = bfd_make_section (dynobj, ".rel.plt.unloaded"); |
| 810 | flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_READONLY |
| 811 | | SEC_LINKER_CREATED); |
| 812 | if (s == NULL |
| 813 | || ! bfd_set_section_flags (dynobj, s, flags) |
| 814 | || ! bfd_set_section_alignment (dynobj, s, bed->s->log_file_align)) |
| 815 | return FALSE; |
| 816 | htab->srelplt2 = s; |
| 817 | } |
| 818 | |
| 819 | return TRUE; |
| 820 | } |
| 821 | |
| 822 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 823 | |
| 824 | static void |
| 825 | elf_i386_copy_indirect_symbol (struct bfd_link_info *info, |
| 826 | struct elf_link_hash_entry *dir, |
| 827 | struct elf_link_hash_entry *ind) |
| 828 | { |
| 829 | struct elf_i386_link_hash_entry *edir, *eind; |
| 830 | |
| 831 | edir = (struct elf_i386_link_hash_entry *) dir; |
| 832 | eind = (struct elf_i386_link_hash_entry *) ind; |
| 833 | |
| 834 | if (eind->dyn_relocs != NULL) |
| 835 | { |
| 836 | if (edir->dyn_relocs != NULL) |
| 837 | { |
| 838 | struct elf_i386_dyn_relocs **pp; |
| 839 | struct elf_i386_dyn_relocs *p; |
| 840 | |
| 841 | /* Add reloc counts against the indirect sym to the direct sym |
| 842 | list. Merge any entries against the same section. */ |
| 843 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| 844 | { |
| 845 | struct elf_i386_dyn_relocs *q; |
| 846 | |
| 847 | for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| 848 | if (q->sec == p->sec) |
| 849 | { |
| 850 | q->pc_count += p->pc_count; |
| 851 | q->count += p->count; |
| 852 | *pp = p->next; |
| 853 | break; |
| 854 | } |
| 855 | if (q == NULL) |
| 856 | pp = &p->next; |
| 857 | } |
| 858 | *pp = edir->dyn_relocs; |
| 859 | } |
| 860 | |
| 861 | edir->dyn_relocs = eind->dyn_relocs; |
| 862 | eind->dyn_relocs = NULL; |
| 863 | } |
| 864 | |
| 865 | if (ind->root.type == bfd_link_hash_indirect |
| 866 | && dir->got.refcount <= 0) |
| 867 | { |
| 868 | edir->tls_type = eind->tls_type; |
| 869 | eind->tls_type = GOT_UNKNOWN; |
| 870 | } |
| 871 | |
| 872 | if (ELIMINATE_COPY_RELOCS |
| 873 | && ind->root.type != bfd_link_hash_indirect |
| 874 | && dir->dynamic_adjusted) |
| 875 | { |
| 876 | /* If called to transfer flags for a weakdef during processing |
| 877 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. |
| 878 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ |
| 879 | dir->ref_dynamic |= ind->ref_dynamic; |
| 880 | dir->ref_regular |= ind->ref_regular; |
| 881 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; |
| 882 | dir->needs_plt |= ind->needs_plt; |
| 883 | dir->pointer_equality_needed |= ind->pointer_equality_needed; |
| 884 | } |
| 885 | else |
| 886 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); |
| 887 | } |
| 888 | |
| 889 | static int |
| 890 | elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local) |
| 891 | { |
| 892 | if (info->shared) |
| 893 | return r_type; |
| 894 | |
| 895 | switch (r_type) |
| 896 | { |
| 897 | case R_386_TLS_GD: |
| 898 | case R_386_TLS_GOTDESC: |
| 899 | case R_386_TLS_DESC_CALL: |
| 900 | case R_386_TLS_IE_32: |
| 901 | if (is_local) |
| 902 | return R_386_TLS_LE_32; |
| 903 | return R_386_TLS_IE_32; |
| 904 | case R_386_TLS_IE: |
| 905 | case R_386_TLS_GOTIE: |
| 906 | if (is_local) |
| 907 | return R_386_TLS_LE_32; |
| 908 | return r_type; |
| 909 | case R_386_TLS_LDM: |
| 910 | return R_386_TLS_LE_32; |
| 911 | } |
| 912 | |
| 913 | return r_type; |
| 914 | } |
| 915 | |
| 916 | /* Look through the relocs for a section during the first phase, and |
| 917 | calculate needed space in the global offset table, procedure linkage |
| 918 | table, and dynamic reloc sections. */ |
| 919 | |
| 920 | static bfd_boolean |
| 921 | elf_i386_check_relocs (bfd *abfd, |
| 922 | struct bfd_link_info *info, |
| 923 | asection *sec, |
| 924 | const Elf_Internal_Rela *relocs) |
| 925 | { |
| 926 | struct elf_i386_link_hash_table *htab; |
| 927 | Elf_Internal_Shdr *symtab_hdr; |
| 928 | struct elf_link_hash_entry **sym_hashes; |
| 929 | const Elf_Internal_Rela *rel; |
| 930 | const Elf_Internal_Rela *rel_end; |
| 931 | asection *sreloc; |
| 932 | |
| 933 | if (info->relocatable) |
| 934 | return TRUE; |
| 935 | |
| 936 | htab = elf_i386_hash_table (info); |
| 937 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 938 | sym_hashes = elf_sym_hashes (abfd); |
| 939 | |
| 940 | sreloc = NULL; |
| 941 | |
| 942 | rel_end = relocs + sec->reloc_count; |
| 943 | for (rel = relocs; rel < rel_end; rel++) |
| 944 | { |
| 945 | unsigned int r_type; |
| 946 | unsigned long r_symndx; |
| 947 | struct elf_link_hash_entry *h; |
| 948 | |
| 949 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 950 | r_type = ELF32_R_TYPE (rel->r_info); |
| 951 | |
| 952 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 953 | { |
| 954 | (*_bfd_error_handler) (_("%B: bad symbol index: %d"), |
| 955 | abfd, |
| 956 | r_symndx); |
| 957 | return FALSE; |
| 958 | } |
| 959 | |
| 960 | if (r_symndx < symtab_hdr->sh_info) |
| 961 | h = NULL; |
| 962 | else |
| 963 | { |
| 964 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 965 | while (h->root.type == bfd_link_hash_indirect |
| 966 | || h->root.type == bfd_link_hash_warning) |
| 967 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 968 | } |
| 969 | |
| 970 | r_type = elf_i386_tls_transition (info, r_type, h == NULL); |
| 971 | |
| 972 | switch (r_type) |
| 973 | { |
| 974 | case R_386_TLS_LDM: |
| 975 | htab->tls_ldm_got.refcount += 1; |
| 976 | goto create_got; |
| 977 | |
| 978 | case R_386_PLT32: |
| 979 | /* This symbol requires a procedure linkage table entry. We |
| 980 | actually build the entry in adjust_dynamic_symbol, |
| 981 | because this might be a case of linking PIC code which is |
| 982 | never referenced by a dynamic object, in which case we |
| 983 | don't need to generate a procedure linkage table entry |
| 984 | after all. */ |
| 985 | |
| 986 | /* If this is a local symbol, we resolve it directly without |
| 987 | creating a procedure linkage table entry. */ |
| 988 | if (h == NULL) |
| 989 | continue; |
| 990 | |
| 991 | h->needs_plt = 1; |
| 992 | h->plt.refcount += 1; |
| 993 | break; |
| 994 | |
| 995 | case R_386_TLS_IE_32: |
| 996 | case R_386_TLS_IE: |
| 997 | case R_386_TLS_GOTIE: |
| 998 | if (info->shared) |
| 999 | info->flags |= DF_STATIC_TLS; |
| 1000 | /* Fall through */ |
| 1001 | |
| 1002 | case R_386_GOT32: |
| 1003 | case R_386_TLS_GD: |
| 1004 | case R_386_TLS_GOTDESC: |
| 1005 | case R_386_TLS_DESC_CALL: |
| 1006 | /* This symbol requires a global offset table entry. */ |
| 1007 | { |
| 1008 | int tls_type, old_tls_type; |
| 1009 | |
| 1010 | switch (r_type) |
| 1011 | { |
| 1012 | default: |
| 1013 | case R_386_GOT32: tls_type = GOT_NORMAL; break; |
| 1014 | case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; |
| 1015 | case R_386_TLS_GOTDESC: |
| 1016 | case R_386_TLS_DESC_CALL: |
| 1017 | tls_type = GOT_TLS_GDESC; break; |
| 1018 | case R_386_TLS_IE_32: |
| 1019 | if (ELF32_R_TYPE (rel->r_info) == r_type) |
| 1020 | tls_type = GOT_TLS_IE_NEG; |
| 1021 | else |
| 1022 | /* If this is a GD->IE transition, we may use either of |
| 1023 | R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ |
| 1024 | tls_type = GOT_TLS_IE; |
| 1025 | break; |
| 1026 | case R_386_TLS_IE: |
| 1027 | case R_386_TLS_GOTIE: |
| 1028 | tls_type = GOT_TLS_IE_POS; break; |
| 1029 | } |
| 1030 | |
| 1031 | if (h != NULL) |
| 1032 | { |
| 1033 | h->got.refcount += 1; |
| 1034 | old_tls_type = elf_i386_hash_entry(h)->tls_type; |
| 1035 | } |
| 1036 | else |
| 1037 | { |
| 1038 | bfd_signed_vma *local_got_refcounts; |
| 1039 | |
| 1040 | /* This is a global offset table entry for a local symbol. */ |
| 1041 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1042 | if (local_got_refcounts == NULL) |
| 1043 | { |
| 1044 | bfd_size_type size; |
| 1045 | |
| 1046 | size = symtab_hdr->sh_info; |
| 1047 | size *= (sizeof (bfd_signed_vma) |
| 1048 | + sizeof (bfd_vma) + sizeof(char)); |
| 1049 | local_got_refcounts = bfd_zalloc (abfd, size); |
| 1050 | if (local_got_refcounts == NULL) |
| 1051 | return FALSE; |
| 1052 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 1053 | elf_i386_local_tlsdesc_gotent (abfd) |
| 1054 | = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); |
| 1055 | elf_i386_local_got_tls_type (abfd) |
| 1056 | = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); |
| 1057 | } |
| 1058 | local_got_refcounts[r_symndx] += 1; |
| 1059 | old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx]; |
| 1060 | } |
| 1061 | |
| 1062 | if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) |
| 1063 | tls_type |= old_tls_type; |
| 1064 | /* If a TLS symbol is accessed using IE at least once, |
| 1065 | there is no point to use dynamic model for it. */ |
| 1066 | else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN |
| 1067 | && (! GOT_TLS_GD_ANY_P (old_tls_type) |
| 1068 | || (tls_type & GOT_TLS_IE) == 0)) |
| 1069 | { |
| 1070 | if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type)) |
| 1071 | tls_type = old_tls_type; |
| 1072 | else if (GOT_TLS_GD_ANY_P (old_tls_type) |
| 1073 | && GOT_TLS_GD_ANY_P (tls_type)) |
| 1074 | tls_type |= old_tls_type; |
| 1075 | else |
| 1076 | { |
| 1077 | (*_bfd_error_handler) |
| 1078 | (_("%B: `%s' accessed both as normal and " |
| 1079 | "thread local symbol"), |
| 1080 | abfd, |
| 1081 | h ? h->root.root.string : "<local>"); |
| 1082 | return FALSE; |
| 1083 | } |
| 1084 | } |
| 1085 | |
| 1086 | if (old_tls_type != tls_type) |
| 1087 | { |
| 1088 | if (h != NULL) |
| 1089 | elf_i386_hash_entry (h)->tls_type = tls_type; |
| 1090 | else |
| 1091 | elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type; |
| 1092 | } |
| 1093 | } |
| 1094 | /* Fall through */ |
| 1095 | |
| 1096 | case R_386_GOTOFF: |
| 1097 | case R_386_GOTPC: |
| 1098 | create_got: |
| 1099 | if (htab->sgot == NULL) |
| 1100 | { |
| 1101 | if (htab->elf.dynobj == NULL) |
| 1102 | htab->elf.dynobj = abfd; |
| 1103 | if (!create_got_section (htab->elf.dynobj, info)) |
| 1104 | return FALSE; |
| 1105 | } |
| 1106 | if (r_type != R_386_TLS_IE) |
| 1107 | break; |
| 1108 | /* Fall through */ |
| 1109 | |
| 1110 | case R_386_TLS_LE_32: |
| 1111 | case R_386_TLS_LE: |
| 1112 | if (!info->shared) |
| 1113 | break; |
| 1114 | info->flags |= DF_STATIC_TLS; |
| 1115 | /* Fall through */ |
| 1116 | |
| 1117 | case R_386_32: |
| 1118 | case R_386_PC32: |
| 1119 | if (h != NULL && !info->shared) |
| 1120 | { |
| 1121 | /* If this reloc is in a read-only section, we might |
| 1122 | need a copy reloc. We can't check reliably at this |
| 1123 | stage whether the section is read-only, as input |
| 1124 | sections have not yet been mapped to output sections. |
| 1125 | Tentatively set the flag for now, and correct in |
| 1126 | adjust_dynamic_symbol. */ |
| 1127 | h->non_got_ref = 1; |
| 1128 | |
| 1129 | /* We may need a .plt entry if the function this reloc |
| 1130 | refers to is in a shared lib. */ |
| 1131 | h->plt.refcount += 1; |
| 1132 | if (r_type != R_386_PC32) |
| 1133 | h->pointer_equality_needed = 1; |
| 1134 | } |
| 1135 | |
| 1136 | /* If we are creating a shared library, and this is a reloc |
| 1137 | against a global symbol, or a non PC relative reloc |
| 1138 | against a local symbol, then we need to copy the reloc |
| 1139 | into the shared library. However, if we are linking with |
| 1140 | -Bsymbolic, we do not need to copy a reloc against a |
| 1141 | global symbol which is defined in an object we are |
| 1142 | including in the link (i.e., DEF_REGULAR is set). At |
| 1143 | this point we have not seen all the input files, so it is |
| 1144 | possible that DEF_REGULAR is not set now but will be set |
| 1145 | later (it is never cleared). In case of a weak definition, |
| 1146 | DEF_REGULAR may be cleared later by a strong definition in |
| 1147 | a shared library. We account for that possibility below by |
| 1148 | storing information in the relocs_copied field of the hash |
| 1149 | table entry. A similar situation occurs when creating |
| 1150 | shared libraries and symbol visibility changes render the |
| 1151 | symbol local. |
| 1152 | |
| 1153 | If on the other hand, we are creating an executable, we |
| 1154 | may need to keep relocations for symbols satisfied by a |
| 1155 | dynamic library if we manage to avoid copy relocs for the |
| 1156 | symbol. */ |
| 1157 | if ((info->shared |
| 1158 | && (sec->flags & SEC_ALLOC) != 0 |
| 1159 | && (r_type != R_386_PC32 |
| 1160 | || (h != NULL |
| 1161 | && (! info->symbolic |
| 1162 | || h->root.type == bfd_link_hash_defweak |
| 1163 | || !h->def_regular)))) |
| 1164 | || (ELIMINATE_COPY_RELOCS |
| 1165 | && !info->shared |
| 1166 | && (sec->flags & SEC_ALLOC) != 0 |
| 1167 | && h != NULL |
| 1168 | && (h->root.type == bfd_link_hash_defweak |
| 1169 | || !h->def_regular))) |
| 1170 | { |
| 1171 | struct elf_i386_dyn_relocs *p; |
| 1172 | struct elf_i386_dyn_relocs **head; |
| 1173 | |
| 1174 | /* We must copy these reloc types into the output file. |
| 1175 | Create a reloc section in dynobj and make room for |
| 1176 | this reloc. */ |
| 1177 | if (sreloc == NULL) |
| 1178 | { |
| 1179 | const char *name; |
| 1180 | bfd *dynobj; |
| 1181 | unsigned int strndx = elf_elfheader (abfd)->e_shstrndx; |
| 1182 | unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name; |
| 1183 | |
| 1184 | name = bfd_elf_string_from_elf_section (abfd, strndx, shnam); |
| 1185 | if (name == NULL) |
| 1186 | return FALSE; |
| 1187 | |
| 1188 | if (strncmp (name, ".rel", 4) != 0 |
| 1189 | || strcmp (bfd_get_section_name (abfd, sec), |
| 1190 | name + 4) != 0) |
| 1191 | { |
| 1192 | (*_bfd_error_handler) |
| 1193 | (_("%B: bad relocation section name `%s\'"), |
| 1194 | abfd, name); |
| 1195 | } |
| 1196 | |
| 1197 | if (htab->elf.dynobj == NULL) |
| 1198 | htab->elf.dynobj = abfd; |
| 1199 | |
| 1200 | dynobj = htab->elf.dynobj; |
| 1201 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 1202 | if (sreloc == NULL) |
| 1203 | { |
| 1204 | flagword flags; |
| 1205 | |
| 1206 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 1207 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 1208 | if ((sec->flags & SEC_ALLOC) != 0) |
| 1209 | flags |= SEC_ALLOC | SEC_LOAD; |
| 1210 | sreloc = bfd_make_section_with_flags (dynobj, |
| 1211 | name, |
| 1212 | flags); |
| 1213 | if (sreloc == NULL |
| 1214 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
| 1215 | return FALSE; |
| 1216 | } |
| 1217 | elf_section_data (sec)->sreloc = sreloc; |
| 1218 | } |
| 1219 | |
| 1220 | /* If this is a global symbol, we count the number of |
| 1221 | relocations we need for this symbol. */ |
| 1222 | if (h != NULL) |
| 1223 | { |
| 1224 | head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs; |
| 1225 | } |
| 1226 | else |
| 1227 | { |
| 1228 | void **vpp; |
| 1229 | /* Track dynamic relocs needed for local syms too. |
| 1230 | We really need local syms available to do this |
| 1231 | easily. Oh well. */ |
| 1232 | |
| 1233 | asection *s; |
| 1234 | s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, |
| 1235 | sec, r_symndx); |
| 1236 | if (s == NULL) |
| 1237 | return FALSE; |
| 1238 | |
| 1239 | vpp = &elf_section_data (s)->local_dynrel; |
| 1240 | head = (struct elf_i386_dyn_relocs **)vpp; |
| 1241 | } |
| 1242 | |
| 1243 | p = *head; |
| 1244 | if (p == NULL || p->sec != sec) |
| 1245 | { |
| 1246 | bfd_size_type amt = sizeof *p; |
| 1247 | p = bfd_alloc (htab->elf.dynobj, amt); |
| 1248 | if (p == NULL) |
| 1249 | return FALSE; |
| 1250 | p->next = *head; |
| 1251 | *head = p; |
| 1252 | p->sec = sec; |
| 1253 | p->count = 0; |
| 1254 | p->pc_count = 0; |
| 1255 | } |
| 1256 | |
| 1257 | p->count += 1; |
| 1258 | if (r_type == R_386_PC32) |
| 1259 | p->pc_count += 1; |
| 1260 | } |
| 1261 | break; |
| 1262 | |
| 1263 | /* This relocation describes the C++ object vtable hierarchy. |
| 1264 | Reconstruct it for later use during GC. */ |
| 1265 | case R_386_GNU_VTINHERIT: |
| 1266 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 1267 | return FALSE; |
| 1268 | break; |
| 1269 | |
| 1270 | /* This relocation describes which C++ vtable entries are actually |
| 1271 | used. Record for later use during GC. */ |
| 1272 | case R_386_GNU_VTENTRY: |
| 1273 | if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
| 1274 | return FALSE; |
| 1275 | break; |
| 1276 | |
| 1277 | default: |
| 1278 | break; |
| 1279 | } |
| 1280 | } |
| 1281 | |
| 1282 | return TRUE; |
| 1283 | } |
| 1284 | |
| 1285 | /* Return the section that should be marked against GC for a given |
| 1286 | relocation. */ |
| 1287 | |
| 1288 | static asection * |
| 1289 | elf_i386_gc_mark_hook (asection *sec, |
| 1290 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 1291 | Elf_Internal_Rela *rel, |
| 1292 | struct elf_link_hash_entry *h, |
| 1293 | Elf_Internal_Sym *sym) |
| 1294 | { |
| 1295 | if (h != NULL) |
| 1296 | { |
| 1297 | switch (ELF32_R_TYPE (rel->r_info)) |
| 1298 | { |
| 1299 | case R_386_GNU_VTINHERIT: |
| 1300 | case R_386_GNU_VTENTRY: |
| 1301 | break; |
| 1302 | |
| 1303 | default: |
| 1304 | switch (h->root.type) |
| 1305 | { |
| 1306 | case bfd_link_hash_defined: |
| 1307 | case bfd_link_hash_defweak: |
| 1308 | return h->root.u.def.section; |
| 1309 | |
| 1310 | case bfd_link_hash_common: |
| 1311 | return h->root.u.c.p->section; |
| 1312 | |
| 1313 | default: |
| 1314 | break; |
| 1315 | } |
| 1316 | } |
| 1317 | } |
| 1318 | else |
| 1319 | return bfd_section_from_elf_index (sec->owner, sym->st_shndx); |
| 1320 | |
| 1321 | return NULL; |
| 1322 | } |
| 1323 | |
| 1324 | /* Update the got entry reference counts for the section being removed. */ |
| 1325 | |
| 1326 | static bfd_boolean |
| 1327 | elf_i386_gc_sweep_hook (bfd *abfd, |
| 1328 | struct bfd_link_info *info, |
| 1329 | asection *sec, |
| 1330 | const Elf_Internal_Rela *relocs) |
| 1331 | { |
| 1332 | Elf_Internal_Shdr *symtab_hdr; |
| 1333 | struct elf_link_hash_entry **sym_hashes; |
| 1334 | bfd_signed_vma *local_got_refcounts; |
| 1335 | const Elf_Internal_Rela *rel, *relend; |
| 1336 | |
| 1337 | elf_section_data (sec)->local_dynrel = NULL; |
| 1338 | |
| 1339 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1340 | sym_hashes = elf_sym_hashes (abfd); |
| 1341 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1342 | |
| 1343 | relend = relocs + sec->reloc_count; |
| 1344 | for (rel = relocs; rel < relend; rel++) |
| 1345 | { |
| 1346 | unsigned long r_symndx; |
| 1347 | unsigned int r_type; |
| 1348 | struct elf_link_hash_entry *h = NULL; |
| 1349 | |
| 1350 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1351 | if (r_symndx >= symtab_hdr->sh_info) |
| 1352 | { |
| 1353 | struct elf_i386_link_hash_entry *eh; |
| 1354 | struct elf_i386_dyn_relocs **pp; |
| 1355 | struct elf_i386_dyn_relocs *p; |
| 1356 | |
| 1357 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1358 | while (h->root.type == bfd_link_hash_indirect |
| 1359 | || h->root.type == bfd_link_hash_warning) |
| 1360 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1361 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1362 | |
| 1363 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| 1364 | if (p->sec == sec) |
| 1365 | { |
| 1366 | /* Everything must go for SEC. */ |
| 1367 | *pp = p->next; |
| 1368 | break; |
| 1369 | } |
| 1370 | } |
| 1371 | |
| 1372 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1373 | r_type = elf_i386_tls_transition (info, r_type, h != NULL); |
| 1374 | switch (r_type) |
| 1375 | { |
| 1376 | case R_386_TLS_LDM: |
| 1377 | if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0) |
| 1378 | elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1; |
| 1379 | break; |
| 1380 | |
| 1381 | case R_386_TLS_GD: |
| 1382 | case R_386_TLS_GOTDESC: |
| 1383 | case R_386_TLS_DESC_CALL: |
| 1384 | case R_386_TLS_IE_32: |
| 1385 | case R_386_TLS_IE: |
| 1386 | case R_386_TLS_GOTIE: |
| 1387 | case R_386_GOT32: |
| 1388 | if (h != NULL) |
| 1389 | { |
| 1390 | if (h->got.refcount > 0) |
| 1391 | h->got.refcount -= 1; |
| 1392 | } |
| 1393 | else if (local_got_refcounts != NULL) |
| 1394 | { |
| 1395 | if (local_got_refcounts[r_symndx] > 0) |
| 1396 | local_got_refcounts[r_symndx] -= 1; |
| 1397 | } |
| 1398 | break; |
| 1399 | |
| 1400 | case R_386_32: |
| 1401 | case R_386_PC32: |
| 1402 | if (info->shared) |
| 1403 | break; |
| 1404 | /* Fall through */ |
| 1405 | |
| 1406 | case R_386_PLT32: |
| 1407 | if (h != NULL) |
| 1408 | { |
| 1409 | if (h->plt.refcount > 0) |
| 1410 | h->plt.refcount -= 1; |
| 1411 | } |
| 1412 | break; |
| 1413 | |
| 1414 | default: |
| 1415 | break; |
| 1416 | } |
| 1417 | } |
| 1418 | |
| 1419 | return TRUE; |
| 1420 | } |
| 1421 | |
| 1422 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 1423 | regular object. The current definition is in some section of the |
| 1424 | dynamic object, but we're not including those sections. We have to |
| 1425 | change the definition to something the rest of the link can |
| 1426 | understand. */ |
| 1427 | |
| 1428 | static bfd_boolean |
| 1429 | elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info, |
| 1430 | struct elf_link_hash_entry *h) |
| 1431 | { |
| 1432 | struct elf_i386_link_hash_table *htab; |
| 1433 | asection *s; |
| 1434 | unsigned int power_of_two; |
| 1435 | |
| 1436 | /* If this is a function, put it in the procedure linkage table. We |
| 1437 | will fill in the contents of the procedure linkage table later, |
| 1438 | when we know the address of the .got section. */ |
| 1439 | if (h->type == STT_FUNC |
| 1440 | || h->needs_plt) |
| 1441 | { |
| 1442 | if (h->plt.refcount <= 0 |
| 1443 | || SYMBOL_CALLS_LOCAL (info, h) |
| 1444 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 1445 | && h->root.type == bfd_link_hash_undefweak)) |
| 1446 | { |
| 1447 | /* This case can occur if we saw a PLT32 reloc in an input |
| 1448 | file, but the symbol was never referred to by a dynamic |
| 1449 | object, or if all references were garbage collected. In |
| 1450 | such a case, we don't actually need to build a procedure |
| 1451 | linkage table, and we can just do a PC32 reloc instead. */ |
| 1452 | h->plt.offset = (bfd_vma) -1; |
| 1453 | h->needs_plt = 0; |
| 1454 | } |
| 1455 | |
| 1456 | return TRUE; |
| 1457 | } |
| 1458 | else |
| 1459 | /* It's possible that we incorrectly decided a .plt reloc was |
| 1460 | needed for an R_386_PC32 reloc to a non-function sym in |
| 1461 | check_relocs. We can't decide accurately between function and |
| 1462 | non-function syms in check-relocs; Objects loaded later in |
| 1463 | the link may change h->type. So fix it now. */ |
| 1464 | h->plt.offset = (bfd_vma) -1; |
| 1465 | |
| 1466 | /* If this is a weak symbol, and there is a real definition, the |
| 1467 | processor independent code will have arranged for us to see the |
| 1468 | real definition first, and we can just use the same value. */ |
| 1469 | if (h->u.weakdef != NULL) |
| 1470 | { |
| 1471 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined |
| 1472 | || h->u.weakdef->root.type == bfd_link_hash_defweak); |
| 1473 | h->root.u.def.section = h->u.weakdef->root.u.def.section; |
| 1474 | h->root.u.def.value = h->u.weakdef->root.u.def.value; |
| 1475 | if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) |
| 1476 | h->non_got_ref = h->u.weakdef->non_got_ref; |
| 1477 | return TRUE; |
| 1478 | } |
| 1479 | |
| 1480 | /* This is a reference to a symbol defined by a dynamic object which |
| 1481 | is not a function. */ |
| 1482 | |
| 1483 | /* If we are creating a shared library, we must presume that the |
| 1484 | only references to the symbol are via the global offset table. |
| 1485 | For such cases we need not do anything here; the relocations will |
| 1486 | be handled correctly by relocate_section. */ |
| 1487 | if (info->shared) |
| 1488 | return TRUE; |
| 1489 | |
| 1490 | /* If there are no references to this symbol that do not use the |
| 1491 | GOT, we don't need to generate a copy reloc. */ |
| 1492 | if (!h->non_got_ref) |
| 1493 | return TRUE; |
| 1494 | |
| 1495 | /* If -z nocopyreloc was given, we won't generate them either. */ |
| 1496 | if (info->nocopyreloc) |
| 1497 | { |
| 1498 | h->non_got_ref = 0; |
| 1499 | return TRUE; |
| 1500 | } |
| 1501 | |
| 1502 | htab = elf_i386_hash_table (info); |
| 1503 | |
| 1504 | /* If there aren't any dynamic relocs in read-only sections, then |
| 1505 | we can keep the dynamic relocs and avoid the copy reloc. This |
| 1506 | doesn't work on VxWorks, where we can not have dynamic relocations |
| 1507 | (other than copy and jump slot relocations) in an executable. */ |
| 1508 | if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks) |
| 1509 | { |
| 1510 | struct elf_i386_link_hash_entry * eh; |
| 1511 | struct elf_i386_dyn_relocs *p; |
| 1512 | |
| 1513 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1514 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1515 | { |
| 1516 | s = p->sec->output_section; |
| 1517 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1518 | break; |
| 1519 | } |
| 1520 | |
| 1521 | if (p == NULL) |
| 1522 | { |
| 1523 | h->non_got_ref = 0; |
| 1524 | return TRUE; |
| 1525 | } |
| 1526 | } |
| 1527 | |
| 1528 | if (h->size == 0) |
| 1529 | { |
| 1530 | (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), |
| 1531 | h->root.root.string); |
| 1532 | return TRUE; |
| 1533 | } |
| 1534 | |
| 1535 | /* We must allocate the symbol in our .dynbss section, which will |
| 1536 | become part of the .bss section of the executable. There will be |
| 1537 | an entry for this symbol in the .dynsym section. The dynamic |
| 1538 | object will contain position independent code, so all references |
| 1539 | from the dynamic object to this symbol will go through the global |
| 1540 | offset table. The dynamic linker will use the .dynsym entry to |
| 1541 | determine the address it must put in the global offset table, so |
| 1542 | both the dynamic object and the regular object will refer to the |
| 1543 | same memory location for the variable. */ |
| 1544 | |
| 1545 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to |
| 1546 | copy the initial value out of the dynamic object and into the |
| 1547 | runtime process image. */ |
| 1548 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 1549 | { |
| 1550 | htab->srelbss->size += sizeof (Elf32_External_Rel); |
| 1551 | h->needs_copy = 1; |
| 1552 | } |
| 1553 | |
| 1554 | /* We need to figure out the alignment required for this symbol. I |
| 1555 | have no idea how ELF linkers handle this. */ |
| 1556 | power_of_two = bfd_log2 (h->size); |
| 1557 | if (power_of_two > 3) |
| 1558 | power_of_two = 3; |
| 1559 | |
| 1560 | /* Apply the required alignment. */ |
| 1561 | s = htab->sdynbss; |
| 1562 | s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); |
| 1563 | if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) |
| 1564 | { |
| 1565 | if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) |
| 1566 | return FALSE; |
| 1567 | } |
| 1568 | |
| 1569 | /* Define the symbol as being at this point in the section. */ |
| 1570 | h->root.u.def.section = s; |
| 1571 | h->root.u.def.value = s->size; |
| 1572 | |
| 1573 | /* Increment the section size to make room for the symbol. */ |
| 1574 | s->size += h->size; |
| 1575 | |
| 1576 | return TRUE; |
| 1577 | } |
| 1578 | |
| 1579 | /* Allocate space in .plt, .got and associated reloc sections for |
| 1580 | dynamic relocs. */ |
| 1581 | |
| 1582 | static bfd_boolean |
| 1583 | allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
| 1584 | { |
| 1585 | struct bfd_link_info *info; |
| 1586 | struct elf_i386_link_hash_table *htab; |
| 1587 | struct elf_i386_link_hash_entry *eh; |
| 1588 | struct elf_i386_dyn_relocs *p; |
| 1589 | |
| 1590 | if (h->root.type == bfd_link_hash_indirect) |
| 1591 | return TRUE; |
| 1592 | |
| 1593 | if (h->root.type == bfd_link_hash_warning) |
| 1594 | /* When warning symbols are created, they **replace** the "real" |
| 1595 | entry in the hash table, thus we never get to see the real |
| 1596 | symbol in a hash traversal. So look at it now. */ |
| 1597 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1598 | |
| 1599 | info = (struct bfd_link_info *) inf; |
| 1600 | htab = elf_i386_hash_table (info); |
| 1601 | |
| 1602 | if (htab->elf.dynamic_sections_created |
| 1603 | && h->plt.refcount > 0) |
| 1604 | { |
| 1605 | /* Make sure this symbol is output as a dynamic symbol. |
| 1606 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1607 | if (h->dynindx == -1 |
| 1608 | && !h->forced_local) |
| 1609 | { |
| 1610 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1611 | return FALSE; |
| 1612 | } |
| 1613 | |
| 1614 | if (info->shared |
| 1615 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) |
| 1616 | { |
| 1617 | asection *s = htab->splt; |
| 1618 | |
| 1619 | /* If this is the first .plt entry, make room for the special |
| 1620 | first entry. */ |
| 1621 | if (s->size == 0) |
| 1622 | s->size += PLT_ENTRY_SIZE; |
| 1623 | |
| 1624 | h->plt.offset = s->size; |
| 1625 | |
| 1626 | /* If this symbol is not defined in a regular file, and we are |
| 1627 | not generating a shared library, then set the symbol to this |
| 1628 | location in the .plt. This is required to make function |
| 1629 | pointers compare as equal between the normal executable and |
| 1630 | the shared library. */ |
| 1631 | if (! info->shared |
| 1632 | && !h->def_regular) |
| 1633 | { |
| 1634 | h->root.u.def.section = s; |
| 1635 | h->root.u.def.value = h->plt.offset; |
| 1636 | } |
| 1637 | |
| 1638 | /* Make room for this entry. */ |
| 1639 | s->size += PLT_ENTRY_SIZE; |
| 1640 | |
| 1641 | /* We also need to make an entry in the .got.plt section, which |
| 1642 | will be placed in the .got section by the linker script. */ |
| 1643 | htab->sgotplt->size += 4; |
| 1644 | |
| 1645 | /* We also need to make an entry in the .rel.plt section. */ |
| 1646 | htab->srelplt->size += sizeof (Elf32_External_Rel); |
| 1647 | htab->srelplt->reloc_count++; |
| 1648 | |
| 1649 | if (htab->is_vxworks && !info->shared) |
| 1650 | { |
| 1651 | /* VxWorks has a second set of relocations for each PLT entry |
| 1652 | in executables. They go in a separate relocation section, |
| 1653 | which is processed by the kernel loader. */ |
| 1654 | |
| 1655 | /* There are two relocations for the initial PLT entry: an |
| 1656 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an |
| 1657 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ |
| 1658 | |
| 1659 | if (h->plt.offset == PLT_ENTRY_SIZE) |
| 1660 | htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); |
| 1661 | |
| 1662 | /* There are two extra relocations for each subsequent PLT entry: |
| 1663 | an R_386_32 relocation for the GOT entry, and an R_386_32 |
| 1664 | relocation for the PLT entry. */ |
| 1665 | |
| 1666 | htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); |
| 1667 | } |
| 1668 | } |
| 1669 | else |
| 1670 | { |
| 1671 | h->plt.offset = (bfd_vma) -1; |
| 1672 | h->needs_plt = 0; |
| 1673 | } |
| 1674 | } |
| 1675 | else |
| 1676 | { |
| 1677 | h->plt.offset = (bfd_vma) -1; |
| 1678 | h->needs_plt = 0; |
| 1679 | } |
| 1680 | |
| 1681 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1682 | eh->tlsdesc_got = (bfd_vma) -1; |
| 1683 | |
| 1684 | /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary, |
| 1685 | make it a R_386_TLS_LE_32 requiring no TLS entry. */ |
| 1686 | if (h->got.refcount > 0 |
| 1687 | && !info->shared |
| 1688 | && h->dynindx == -1 |
| 1689 | && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE)) |
| 1690 | h->got.offset = (bfd_vma) -1; |
| 1691 | else if (h->got.refcount > 0) |
| 1692 | { |
| 1693 | asection *s; |
| 1694 | bfd_boolean dyn; |
| 1695 | int tls_type = elf_i386_hash_entry(h)->tls_type; |
| 1696 | |
| 1697 | /* Make sure this symbol is output as a dynamic symbol. |
| 1698 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1699 | if (h->dynindx == -1 |
| 1700 | && !h->forced_local) |
| 1701 | { |
| 1702 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1703 | return FALSE; |
| 1704 | } |
| 1705 | |
| 1706 | s = htab->sgot; |
| 1707 | if (GOT_TLS_GDESC_P (tls_type)) |
| 1708 | { |
| 1709 | eh->tlsdesc_got = htab->sgotplt->size |
| 1710 | - elf_i386_compute_jump_table_size (htab); |
| 1711 | htab->sgotplt->size += 8; |
| 1712 | h->got.offset = (bfd_vma) -2; |
| 1713 | } |
| 1714 | if (! GOT_TLS_GDESC_P (tls_type) |
| 1715 | || GOT_TLS_GD_P (tls_type)) |
| 1716 | { |
| 1717 | h->got.offset = s->size; |
| 1718 | s->size += 4; |
| 1719 | /* R_386_TLS_GD needs 2 consecutive GOT slots. */ |
| 1720 | if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH) |
| 1721 | s->size += 4; |
| 1722 | } |
| 1723 | dyn = htab->elf.dynamic_sections_created; |
| 1724 | /* R_386_TLS_IE_32 needs one dynamic relocation, |
| 1725 | R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, |
| 1726 | (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we |
| 1727 | need two), R_386_TLS_GD needs one if local symbol and two if |
| 1728 | global. */ |
| 1729 | if (tls_type == GOT_TLS_IE_BOTH) |
| 1730 | htab->srelgot->size += 2 * sizeof (Elf32_External_Rel); |
| 1731 | else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) |
| 1732 | || (tls_type & GOT_TLS_IE)) |
| 1733 | htab->srelgot->size += sizeof (Elf32_External_Rel); |
| 1734 | else if (GOT_TLS_GD_P (tls_type)) |
| 1735 | htab->srelgot->size += 2 * sizeof (Elf32_External_Rel); |
| 1736 | else if (! GOT_TLS_GDESC_P (tls_type) |
| 1737 | && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 1738 | || h->root.type != bfd_link_hash_undefweak) |
| 1739 | && (info->shared |
| 1740 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) |
| 1741 | htab->srelgot->size += sizeof (Elf32_External_Rel); |
| 1742 | if (GOT_TLS_GDESC_P (tls_type)) |
| 1743 | htab->srelplt->size += sizeof (Elf32_External_Rel); |
| 1744 | } |
| 1745 | else |
| 1746 | h->got.offset = (bfd_vma) -1; |
| 1747 | |
| 1748 | if (eh->dyn_relocs == NULL) |
| 1749 | return TRUE; |
| 1750 | |
| 1751 | /* In the shared -Bsymbolic case, discard space allocated for |
| 1752 | dynamic pc-relative relocs against symbols which turn out to be |
| 1753 | defined in regular objects. For the normal shared case, discard |
| 1754 | space for pc-relative relocs that have become local due to symbol |
| 1755 | visibility changes. */ |
| 1756 | |
| 1757 | if (info->shared) |
| 1758 | { |
| 1759 | /* The only reloc that uses pc_count is R_386_PC32, which will |
| 1760 | appear on a call or on something like ".long foo - .". We |
| 1761 | want calls to protected symbols to resolve directly to the |
| 1762 | function rather than going via the plt. If people want |
| 1763 | function pointer comparisons to work as expected then they |
| 1764 | should avoid writing assembly like ".long foo - .". */ |
| 1765 | if (SYMBOL_CALLS_LOCAL (info, h)) |
| 1766 | { |
| 1767 | struct elf_i386_dyn_relocs **pp; |
| 1768 | |
| 1769 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 1770 | { |
| 1771 | p->count -= p->pc_count; |
| 1772 | p->pc_count = 0; |
| 1773 | if (p->count == 0) |
| 1774 | *pp = p->next; |
| 1775 | else |
| 1776 | pp = &p->next; |
| 1777 | } |
| 1778 | } |
| 1779 | |
| 1780 | /* Also discard relocs on undefined weak syms with non-default |
| 1781 | visibility. */ |
| 1782 | if (eh->dyn_relocs != NULL |
| 1783 | && h->root.type == bfd_link_hash_undefweak) |
| 1784 | { |
| 1785 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 1786 | eh->dyn_relocs = NULL; |
| 1787 | |
| 1788 | /* Make sure undefined weak symbols are output as a dynamic |
| 1789 | symbol in PIEs. */ |
| 1790 | else if (h->dynindx == -1 |
| 1791 | && !h->forced_local) |
| 1792 | { |
| 1793 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1794 | return FALSE; |
| 1795 | } |
| 1796 | } |
| 1797 | } |
| 1798 | else if (ELIMINATE_COPY_RELOCS) |
| 1799 | { |
| 1800 | /* For the non-shared case, discard space for relocs against |
| 1801 | symbols which turn out to need copy relocs or are not |
| 1802 | dynamic. */ |
| 1803 | |
| 1804 | if (!h->non_got_ref |
| 1805 | && ((h->def_dynamic |
| 1806 | && !h->def_regular) |
| 1807 | || (htab->elf.dynamic_sections_created |
| 1808 | && (h->root.type == bfd_link_hash_undefweak |
| 1809 | || h->root.type == bfd_link_hash_undefined)))) |
| 1810 | { |
| 1811 | /* Make sure this symbol is output as a dynamic symbol. |
| 1812 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1813 | if (h->dynindx == -1 |
| 1814 | && !h->forced_local) |
| 1815 | { |
| 1816 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1817 | return FALSE; |
| 1818 | } |
| 1819 | |
| 1820 | /* If that succeeded, we know we'll be keeping all the |
| 1821 | relocs. */ |
| 1822 | if (h->dynindx != -1) |
| 1823 | goto keep; |
| 1824 | } |
| 1825 | |
| 1826 | eh->dyn_relocs = NULL; |
| 1827 | |
| 1828 | keep: ; |
| 1829 | } |
| 1830 | |
| 1831 | /* Finally, allocate space. */ |
| 1832 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1833 | { |
| 1834 | asection *sreloc = elf_section_data (p->sec)->sreloc; |
| 1835 | sreloc->size += p->count * sizeof (Elf32_External_Rel); |
| 1836 | } |
| 1837 | |
| 1838 | return TRUE; |
| 1839 | } |
| 1840 | |
| 1841 | /* Find any dynamic relocs that apply to read-only sections. */ |
| 1842 | |
| 1843 | static bfd_boolean |
| 1844 | readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
| 1845 | { |
| 1846 | struct elf_i386_link_hash_entry *eh; |
| 1847 | struct elf_i386_dyn_relocs *p; |
| 1848 | |
| 1849 | if (h->root.type == bfd_link_hash_warning) |
| 1850 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1851 | |
| 1852 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1853 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1854 | { |
| 1855 | asection *s = p->sec->output_section; |
| 1856 | |
| 1857 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1858 | { |
| 1859 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 1860 | |
| 1861 | info->flags |= DF_TEXTREL; |
| 1862 | |
| 1863 | /* Not an error, just cut short the traversal. */ |
| 1864 | return FALSE; |
| 1865 | } |
| 1866 | } |
| 1867 | return TRUE; |
| 1868 | } |
| 1869 | |
| 1870 | /* Set the sizes of the dynamic sections. */ |
| 1871 | |
| 1872 | static bfd_boolean |
| 1873 | elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 1874 | struct bfd_link_info *info) |
| 1875 | { |
| 1876 | struct elf_i386_link_hash_table *htab; |
| 1877 | bfd *dynobj; |
| 1878 | asection *s; |
| 1879 | bfd_boolean relocs; |
| 1880 | bfd *ibfd; |
| 1881 | |
| 1882 | htab = elf_i386_hash_table (info); |
| 1883 | dynobj = htab->elf.dynobj; |
| 1884 | if (dynobj == NULL) |
| 1885 | abort (); |
| 1886 | |
| 1887 | if (htab->elf.dynamic_sections_created) |
| 1888 | { |
| 1889 | /* Set the contents of the .interp section to the interpreter. */ |
| 1890 | if (info->executable) |
| 1891 | { |
| 1892 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 1893 | if (s == NULL) |
| 1894 | abort (); |
| 1895 | s->size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 1896 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 1897 | } |
| 1898 | } |
| 1899 | |
| 1900 | /* Set up .got offsets for local syms, and space for local dynamic |
| 1901 | relocs. */ |
| 1902 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 1903 | { |
| 1904 | bfd_signed_vma *local_got; |
| 1905 | bfd_signed_vma *end_local_got; |
| 1906 | char *local_tls_type; |
| 1907 | bfd_vma *local_tlsdesc_gotent; |
| 1908 | bfd_size_type locsymcount; |
| 1909 | Elf_Internal_Shdr *symtab_hdr; |
| 1910 | asection *srel; |
| 1911 | |
| 1912 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| 1913 | continue; |
| 1914 | |
| 1915 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 1916 | { |
| 1917 | struct elf_i386_dyn_relocs *p; |
| 1918 | |
| 1919 | for (p = ((struct elf_i386_dyn_relocs *) |
| 1920 | elf_section_data (s)->local_dynrel); |
| 1921 | p != NULL; |
| 1922 | p = p->next) |
| 1923 | { |
| 1924 | if (!bfd_is_abs_section (p->sec) |
| 1925 | && bfd_is_abs_section (p->sec->output_section)) |
| 1926 | { |
| 1927 | /* Input section has been discarded, either because |
| 1928 | it is a copy of a linkonce section or due to |
| 1929 | linker script /DISCARD/, so we'll be discarding |
| 1930 | the relocs too. */ |
| 1931 | } |
| 1932 | else if (p->count != 0) |
| 1933 | { |
| 1934 | srel = elf_section_data (p->sec)->sreloc; |
| 1935 | srel->size += p->count * sizeof (Elf32_External_Rel); |
| 1936 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) |
| 1937 | info->flags |= DF_TEXTREL; |
| 1938 | } |
| 1939 | } |
| 1940 | } |
| 1941 | |
| 1942 | local_got = elf_local_got_refcounts (ibfd); |
| 1943 | if (!local_got) |
| 1944 | continue; |
| 1945 | |
| 1946 | symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; |
| 1947 | locsymcount = symtab_hdr->sh_info; |
| 1948 | end_local_got = local_got + locsymcount; |
| 1949 | local_tls_type = elf_i386_local_got_tls_type (ibfd); |
| 1950 | local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd); |
| 1951 | s = htab->sgot; |
| 1952 | srel = htab->srelgot; |
| 1953 | for (; local_got < end_local_got; |
| 1954 | ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) |
| 1955 | { |
| 1956 | *local_tlsdesc_gotent = (bfd_vma) -1; |
| 1957 | if (*local_got > 0) |
| 1958 | { |
| 1959 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 1960 | { |
| 1961 | *local_tlsdesc_gotent = htab->sgotplt->size |
| 1962 | - elf_i386_compute_jump_table_size (htab); |
| 1963 | htab->sgotplt->size += 8; |
| 1964 | *local_got = (bfd_vma) -2; |
| 1965 | } |
| 1966 | if (! GOT_TLS_GDESC_P (*local_tls_type) |
| 1967 | || GOT_TLS_GD_P (*local_tls_type)) |
| 1968 | { |
| 1969 | *local_got = s->size; |
| 1970 | s->size += 4; |
| 1971 | if (GOT_TLS_GD_P (*local_tls_type) |
| 1972 | || *local_tls_type == GOT_TLS_IE_BOTH) |
| 1973 | s->size += 4; |
| 1974 | } |
| 1975 | if (info->shared |
| 1976 | || GOT_TLS_GD_ANY_P (*local_tls_type) |
| 1977 | || (*local_tls_type & GOT_TLS_IE)) |
| 1978 | { |
| 1979 | if (*local_tls_type == GOT_TLS_IE_BOTH) |
| 1980 | srel->size += 2 * sizeof (Elf32_External_Rel); |
| 1981 | else if (GOT_TLS_GD_P (*local_tls_type) |
| 1982 | || ! GOT_TLS_GDESC_P (*local_tls_type)) |
| 1983 | srel->size += sizeof (Elf32_External_Rel); |
| 1984 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 1985 | htab->srelplt->size += sizeof (Elf32_External_Rel); |
| 1986 | } |
| 1987 | } |
| 1988 | else |
| 1989 | *local_got = (bfd_vma) -1; |
| 1990 | } |
| 1991 | } |
| 1992 | |
| 1993 | if (htab->tls_ldm_got.refcount > 0) |
| 1994 | { |
| 1995 | /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM |
| 1996 | relocs. */ |
| 1997 | htab->tls_ldm_got.offset = htab->sgot->size; |
| 1998 | htab->sgot->size += 8; |
| 1999 | htab->srelgot->size += sizeof (Elf32_External_Rel); |
| 2000 | } |
| 2001 | else |
| 2002 | htab->tls_ldm_got.offset = -1; |
| 2003 | |
| 2004 | if (htab->is_vxworks) |
| 2005 | { |
| 2006 | /* Save the GOT and PLT symbols in the hash table for easy access. |
| 2007 | Mark them as having relocations; they might not, but we won't |
| 2008 | know for sure until we build the GOT in finish_dynamic_symbol. */ |
| 2009 | |
| 2010 | htab->hgot = elf_link_hash_lookup (elf_hash_table (info), |
| 2011 | "_GLOBAL_OFFSET_TABLE_", |
| 2012 | FALSE, FALSE, FALSE); |
| 2013 | if (htab->hgot) |
| 2014 | htab->hgot->indx = -2; |
| 2015 | htab->hplt = elf_link_hash_lookup (elf_hash_table (info), |
| 2016 | "_PROCEDURE_LINKAGE_TABLE_", |
| 2017 | FALSE, FALSE, FALSE); |
| 2018 | if (htab->hplt) |
| 2019 | htab->hplt->indx = -2; |
| 2020 | |
| 2021 | if (htab->is_vxworks && htab->hplt && htab->splt->flags & SEC_CODE) |
| 2022 | htab->hplt->type = STT_FUNC; |
| 2023 | } |
| 2024 | |
| 2025 | /* Allocate global sym .plt and .got entries, and space for global |
| 2026 | sym dynamic relocs. */ |
| 2027 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); |
| 2028 | |
| 2029 | /* For every jump slot reserved in the sgotplt, reloc_count is |
| 2030 | incremented. However, when we reserve space for TLS descriptors, |
| 2031 | it's not incremented, so in order to compute the space reserved |
| 2032 | for them, it suffices to multiply the reloc count by the jump |
| 2033 | slot size. */ |
| 2034 | if (htab->srelplt) |
| 2035 | htab->sgotplt_jump_table_size = htab->srelplt->reloc_count * 4; |
| 2036 | |
| 2037 | /* We now have determined the sizes of the various dynamic sections. |
| 2038 | Allocate memory for them. */ |
| 2039 | relocs = FALSE; |
| 2040 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 2041 | { |
| 2042 | bfd_boolean strip_section = TRUE; |
| 2043 | |
| 2044 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 2045 | continue; |
| 2046 | |
| 2047 | if (s == htab->splt |
| 2048 | || s == htab->sgot |
| 2049 | || s == htab->sgotplt |
| 2050 | || s == htab->sdynbss) |
| 2051 | { |
| 2052 | /* Strip this section if we don't need it; see the |
| 2053 | comment below. */ |
| 2054 | /* We'd like to strip these sections if they aren't needed, but if |
| 2055 | we've exported dynamic symbols from them we must leave them. |
| 2056 | It's too late to tell BFD to get rid of the symbols. */ |
| 2057 | |
| 2058 | if (htab->hplt != NULL) |
| 2059 | strip_section = FALSE; |
| 2060 | } |
| 2061 | else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0) |
| 2062 | { |
| 2063 | if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2) |
| 2064 | relocs = TRUE; |
| 2065 | |
| 2066 | /* We use the reloc_count field as a counter if we need |
| 2067 | to copy relocs into the output file. */ |
| 2068 | if (s != htab->srelplt) |
| 2069 | s->reloc_count = 0; |
| 2070 | } |
| 2071 | else |
| 2072 | { |
| 2073 | /* It's not one of our sections, so don't allocate space. */ |
| 2074 | continue; |
| 2075 | } |
| 2076 | |
| 2077 | if (s->size == 0) |
| 2078 | { |
| 2079 | /* If we don't need this section, strip it from the |
| 2080 | output file. This is mostly to handle .rel.bss and |
| 2081 | .rel.plt. We must create both sections in |
| 2082 | create_dynamic_sections, because they must be created |
| 2083 | before the linker maps input sections to output |
| 2084 | sections. The linker does that before |
| 2085 | adjust_dynamic_symbol is called, and it is that |
| 2086 | function which decides whether anything needs to go |
| 2087 | into these sections. */ |
| 2088 | if (strip_section) |
| 2089 | s->flags |= SEC_EXCLUDE; |
| 2090 | continue; |
| 2091 | } |
| 2092 | |
| 2093 | if ((s->flags & SEC_HAS_CONTENTS) == 0) |
| 2094 | continue; |
| 2095 | |
| 2096 | /* Allocate memory for the section contents. We use bfd_zalloc |
| 2097 | here in case unused entries are not reclaimed before the |
| 2098 | section's contents are written out. This should not happen, |
| 2099 | but this way if it does, we get a R_386_NONE reloc instead |
| 2100 | of garbage. */ |
| 2101 | s->contents = bfd_zalloc (dynobj, s->size); |
| 2102 | if (s->contents == NULL) |
| 2103 | return FALSE; |
| 2104 | } |
| 2105 | |
| 2106 | if (htab->elf.dynamic_sections_created) |
| 2107 | { |
| 2108 | /* Add some entries to the .dynamic section. We fill in the |
| 2109 | values later, in elf_i386_finish_dynamic_sections, but we |
| 2110 | must add the entries now so that we get the correct size for |
| 2111 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 2112 | dynamic linker and used by the debugger. */ |
| 2113 | #define add_dynamic_entry(TAG, VAL) \ |
| 2114 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| 2115 | |
| 2116 | if (info->executable) |
| 2117 | { |
| 2118 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 2119 | return FALSE; |
| 2120 | } |
| 2121 | |
| 2122 | if (htab->splt->size != 0) |
| 2123 | { |
| 2124 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 2125 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 2126 | || !add_dynamic_entry (DT_PLTREL, DT_REL) |
| 2127 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 2128 | return FALSE; |
| 2129 | } |
| 2130 | |
| 2131 | if (relocs) |
| 2132 | { |
| 2133 | if (!add_dynamic_entry (DT_REL, 0) |
| 2134 | || !add_dynamic_entry (DT_RELSZ, 0) |
| 2135 | || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) |
| 2136 | return FALSE; |
| 2137 | |
| 2138 | /* If any dynamic relocs apply to a read-only section, |
| 2139 | then we need a DT_TEXTREL entry. */ |
| 2140 | if ((info->flags & DF_TEXTREL) == 0) |
| 2141 | elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, |
| 2142 | (PTR) info); |
| 2143 | |
| 2144 | if ((info->flags & DF_TEXTREL) != 0) |
| 2145 | { |
| 2146 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 2147 | return FALSE; |
| 2148 | } |
| 2149 | } |
| 2150 | } |
| 2151 | #undef add_dynamic_entry |
| 2152 | |
| 2153 | return TRUE; |
| 2154 | } |
| 2155 | |
| 2156 | static bfd_boolean |
| 2157 | elf_i386_always_size_sections (bfd *output_bfd, |
| 2158 | struct bfd_link_info *info) |
| 2159 | { |
| 2160 | asection *tls_sec = elf_hash_table (info)->tls_sec; |
| 2161 | |
| 2162 | if (tls_sec) |
| 2163 | { |
| 2164 | struct elf_link_hash_entry *tlsbase; |
| 2165 | |
| 2166 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), |
| 2167 | "_TLS_MODULE_BASE_", |
| 2168 | FALSE, FALSE, FALSE); |
| 2169 | |
| 2170 | if (tlsbase && tlsbase->type == STT_TLS) |
| 2171 | { |
| 2172 | struct bfd_link_hash_entry *bh = NULL; |
| 2173 | const struct elf_backend_data *bed |
| 2174 | = get_elf_backend_data (output_bfd); |
| 2175 | |
| 2176 | if (!(_bfd_generic_link_add_one_symbol |
| 2177 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, |
| 2178 | tls_sec, 0, NULL, FALSE, |
| 2179 | bed->collect, &bh))) |
| 2180 | return FALSE; |
| 2181 | tlsbase = (struct elf_link_hash_entry *)bh; |
| 2182 | tlsbase->def_regular = 1; |
| 2183 | tlsbase->other = STV_HIDDEN; |
| 2184 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); |
| 2185 | } |
| 2186 | } |
| 2187 | |
| 2188 | return TRUE; |
| 2189 | } |
| 2190 | |
| 2191 | /* Set the correct type for an x86 ELF section. We do this by the |
| 2192 | section name, which is a hack, but ought to work. */ |
| 2193 | |
| 2194 | static bfd_boolean |
| 2195 | elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, |
| 2196 | Elf_Internal_Shdr *hdr, |
| 2197 | asection *sec) |
| 2198 | { |
| 2199 | register const char *name; |
| 2200 | |
| 2201 | name = bfd_get_section_name (abfd, sec); |
| 2202 | |
| 2203 | /* This is an ugly, but unfortunately necessary hack that is |
| 2204 | needed when producing EFI binaries on x86. It tells |
| 2205 | elf.c:elf_fake_sections() not to consider ".reloc" as a section |
| 2206 | containing ELF relocation info. We need this hack in order to |
| 2207 | be able to generate ELF binaries that can be translated into |
| 2208 | EFI applications (which are essentially COFF objects). Those |
| 2209 | files contain a COFF ".reloc" section inside an ELFNN object, |
| 2210 | which would normally cause BFD to segfault because it would |
| 2211 | attempt to interpret this section as containing relocation |
| 2212 | entries for section "oc". With this hack enabled, ".reloc" |
| 2213 | will be treated as a normal data section, which will avoid the |
| 2214 | segfault. However, you won't be able to create an ELFNN binary |
| 2215 | with a section named "oc" that needs relocations, but that's |
| 2216 | the kind of ugly side-effects you get when detecting section |
| 2217 | types based on their names... In practice, this limitation is |
| 2218 | unlikely to bite. */ |
| 2219 | if (strcmp (name, ".reloc") == 0) |
| 2220 | hdr->sh_type = SHT_PROGBITS; |
| 2221 | |
| 2222 | return TRUE; |
| 2223 | } |
| 2224 | |
| 2225 | /* Return the base VMA address which should be subtracted from real addresses |
| 2226 | when resolving @dtpoff relocation. |
| 2227 | This is PT_TLS segment p_vaddr. */ |
| 2228 | |
| 2229 | static bfd_vma |
| 2230 | dtpoff_base (struct bfd_link_info *info) |
| 2231 | { |
| 2232 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 2233 | if (elf_hash_table (info)->tls_sec == NULL) |
| 2234 | return 0; |
| 2235 | return elf_hash_table (info)->tls_sec->vma; |
| 2236 | } |
| 2237 | |
| 2238 | /* Return the relocation value for @tpoff relocation |
| 2239 | if STT_TLS virtual address is ADDRESS. */ |
| 2240 | |
| 2241 | static bfd_vma |
| 2242 | tpoff (struct bfd_link_info *info, bfd_vma address) |
| 2243 | { |
| 2244 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 2245 | |
| 2246 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 2247 | if (htab->tls_sec == NULL) |
| 2248 | return 0; |
| 2249 | return htab->tls_size + htab->tls_sec->vma - address; |
| 2250 | } |
| 2251 | |
| 2252 | /* Relocate an i386 ELF section. */ |
| 2253 | |
| 2254 | static bfd_boolean |
| 2255 | elf_i386_relocate_section (bfd *output_bfd, |
| 2256 | struct bfd_link_info *info, |
| 2257 | bfd *input_bfd, |
| 2258 | asection *input_section, |
| 2259 | bfd_byte *contents, |
| 2260 | Elf_Internal_Rela *relocs, |
| 2261 | Elf_Internal_Sym *local_syms, |
| 2262 | asection **local_sections) |
| 2263 | { |
| 2264 | struct elf_i386_link_hash_table *htab; |
| 2265 | Elf_Internal_Shdr *symtab_hdr; |
| 2266 | struct elf_link_hash_entry **sym_hashes; |
| 2267 | bfd_vma *local_got_offsets; |
| 2268 | bfd_vma *local_tlsdesc_gotents; |
| 2269 | Elf_Internal_Rela *rel; |
| 2270 | Elf_Internal_Rela *relend; |
| 2271 | |
| 2272 | htab = elf_i386_hash_table (info); |
| 2273 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 2274 | sym_hashes = elf_sym_hashes (input_bfd); |
| 2275 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 2276 | local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd); |
| 2277 | |
| 2278 | rel = relocs; |
| 2279 | relend = relocs + input_section->reloc_count; |
| 2280 | for (; rel < relend; rel++) |
| 2281 | { |
| 2282 | unsigned int r_type; |
| 2283 | reloc_howto_type *howto; |
| 2284 | unsigned long r_symndx; |
| 2285 | struct elf_link_hash_entry *h; |
| 2286 | Elf_Internal_Sym *sym; |
| 2287 | asection *sec; |
| 2288 | bfd_vma off, offplt; |
| 2289 | bfd_vma relocation; |
| 2290 | bfd_boolean unresolved_reloc; |
| 2291 | bfd_reloc_status_type r; |
| 2292 | unsigned int indx; |
| 2293 | int tls_type; |
| 2294 | |
| 2295 | r_type = ELF32_R_TYPE (rel->r_info); |
| 2296 | if (r_type == R_386_GNU_VTINHERIT |
| 2297 | || r_type == R_386_GNU_VTENTRY) |
| 2298 | continue; |
| 2299 | |
| 2300 | if ((indx = r_type) >= R_386_standard |
| 2301 | && ((indx = r_type - R_386_ext_offset) - R_386_standard |
| 2302 | >= R_386_ext - R_386_standard) |
| 2303 | && ((indx = r_type - R_386_tls_offset) - R_386_ext |
| 2304 | >= R_386_tls - R_386_ext)) |
| 2305 | { |
| 2306 | (*_bfd_error_handler) |
| 2307 | (_("%B: unrecognized relocation (0x%x) in section `%A'"), |
| 2308 | input_bfd, input_section, r_type); |
| 2309 | bfd_set_error (bfd_error_bad_value); |
| 2310 | return FALSE; |
| 2311 | } |
| 2312 | howto = elf_howto_table + indx; |
| 2313 | |
| 2314 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2315 | |
| 2316 | if (info->relocatable) |
| 2317 | { |
| 2318 | bfd_vma val; |
| 2319 | bfd_byte *where; |
| 2320 | |
| 2321 | /* This is a relocatable link. We don't have to change |
| 2322 | anything, unless the reloc is against a section symbol, |
| 2323 | in which case we have to adjust according to where the |
| 2324 | section symbol winds up in the output section. */ |
| 2325 | if (r_symndx >= symtab_hdr->sh_info) |
| 2326 | continue; |
| 2327 | |
| 2328 | sym = local_syms + r_symndx; |
| 2329 | if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) |
| 2330 | continue; |
| 2331 | |
| 2332 | sec = local_sections[r_symndx]; |
| 2333 | val = sec->output_offset; |
| 2334 | if (val == 0) |
| 2335 | continue; |
| 2336 | |
| 2337 | where = contents + rel->r_offset; |
| 2338 | switch (howto->size) |
| 2339 | { |
| 2340 | /* FIXME: overflow checks. */ |
| 2341 | case 0: |
| 2342 | val += bfd_get_8 (input_bfd, where); |
| 2343 | bfd_put_8 (input_bfd, val, where); |
| 2344 | break; |
| 2345 | case 1: |
| 2346 | val += bfd_get_16 (input_bfd, where); |
| 2347 | bfd_put_16 (input_bfd, val, where); |
| 2348 | break; |
| 2349 | case 2: |
| 2350 | val += bfd_get_32 (input_bfd, where); |
| 2351 | bfd_put_32 (input_bfd, val, where); |
| 2352 | break; |
| 2353 | default: |
| 2354 | abort (); |
| 2355 | } |
| 2356 | continue; |
| 2357 | } |
| 2358 | |
| 2359 | /* This is a final link. */ |
| 2360 | h = NULL; |
| 2361 | sym = NULL; |
| 2362 | sec = NULL; |
| 2363 | unresolved_reloc = FALSE; |
| 2364 | if (r_symndx < symtab_hdr->sh_info) |
| 2365 | { |
| 2366 | sym = local_syms + r_symndx; |
| 2367 | sec = local_sections[r_symndx]; |
| 2368 | relocation = (sec->output_section->vma |
| 2369 | + sec->output_offset |
| 2370 | + sym->st_value); |
| 2371 | if ((sec->flags & SEC_MERGE) |
| 2372 | && ELF_ST_TYPE (sym->st_info) == STT_SECTION) |
| 2373 | { |
| 2374 | asection *msec; |
| 2375 | bfd_vma addend; |
| 2376 | bfd_byte *where = contents + rel->r_offset; |
| 2377 | |
| 2378 | switch (howto->size) |
| 2379 | { |
| 2380 | case 0: |
| 2381 | addend = bfd_get_8 (input_bfd, where); |
| 2382 | if (howto->pc_relative) |
| 2383 | { |
| 2384 | addend = (addend ^ 0x80) - 0x80; |
| 2385 | addend += 1; |
| 2386 | } |
| 2387 | break; |
| 2388 | case 1: |
| 2389 | addend = bfd_get_16 (input_bfd, where); |
| 2390 | if (howto->pc_relative) |
| 2391 | { |
| 2392 | addend = (addend ^ 0x8000) - 0x8000; |
| 2393 | addend += 2; |
| 2394 | } |
| 2395 | break; |
| 2396 | case 2: |
| 2397 | addend = bfd_get_32 (input_bfd, where); |
| 2398 | if (howto->pc_relative) |
| 2399 | { |
| 2400 | addend = (addend ^ 0x80000000) - 0x80000000; |
| 2401 | addend += 4; |
| 2402 | } |
| 2403 | break; |
| 2404 | default: |
| 2405 | abort (); |
| 2406 | } |
| 2407 | |
| 2408 | msec = sec; |
| 2409 | addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend); |
| 2410 | addend -= relocation; |
| 2411 | addend += msec->output_section->vma + msec->output_offset; |
| 2412 | |
| 2413 | switch (howto->size) |
| 2414 | { |
| 2415 | case 0: |
| 2416 | /* FIXME: overflow checks. */ |
| 2417 | if (howto->pc_relative) |
| 2418 | addend -= 1; |
| 2419 | bfd_put_8 (input_bfd, addend, where); |
| 2420 | break; |
| 2421 | case 1: |
| 2422 | if (howto->pc_relative) |
| 2423 | addend -= 2; |
| 2424 | bfd_put_16 (input_bfd, addend, where); |
| 2425 | break; |
| 2426 | case 2: |
| 2427 | if (howto->pc_relative) |
| 2428 | addend -= 4; |
| 2429 | bfd_put_32 (input_bfd, addend, where); |
| 2430 | break; |
| 2431 | } |
| 2432 | } |
| 2433 | } |
| 2434 | else |
| 2435 | { |
| 2436 | bfd_boolean warned; |
| 2437 | |
| 2438 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 2439 | r_symndx, symtab_hdr, sym_hashes, |
| 2440 | h, sec, relocation, |
| 2441 | unresolved_reloc, warned); |
| 2442 | } |
| 2443 | |
| 2444 | if (r_symndx == 0) |
| 2445 | { |
| 2446 | /* r_symndx will be zero only for relocs against symbols from |
| 2447 | removed linkonce sections, or sections discarded by a linker |
| 2448 | script. For these relocs, we just want the section contents |
| 2449 | zeroed. Avoid any special processing in the switch below. */ |
| 2450 | r_type = R_386_NONE; |
| 2451 | |
| 2452 | relocation = 0; |
| 2453 | if (howto->pc_relative) |
| 2454 | relocation = (input_section->output_section->vma |
| 2455 | + input_section->output_offset |
| 2456 | + rel->r_offset); |
| 2457 | } |
| 2458 | |
| 2459 | switch (r_type) |
| 2460 | { |
| 2461 | case R_386_GOT32: |
| 2462 | /* Relocation is to the entry for this symbol in the global |
| 2463 | offset table. */ |
| 2464 | if (htab->sgot == NULL) |
| 2465 | abort (); |
| 2466 | |
| 2467 | if (h != NULL) |
| 2468 | { |
| 2469 | bfd_boolean dyn; |
| 2470 | |
| 2471 | off = h->got.offset; |
| 2472 | dyn = htab->elf.dynamic_sections_created; |
| 2473 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| 2474 | || (info->shared |
| 2475 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 2476 | || (ELF_ST_VISIBILITY (h->other) |
| 2477 | && h->root.type == bfd_link_hash_undefweak)) |
| 2478 | { |
| 2479 | /* This is actually a static link, or it is a |
| 2480 | -Bsymbolic link and the symbol is defined |
| 2481 | locally, or the symbol was forced to be local |
| 2482 | because of a version file. We must initialize |
| 2483 | this entry in the global offset table. Since the |
| 2484 | offset must always be a multiple of 4, we use the |
| 2485 | least significant bit to record whether we have |
| 2486 | initialized it already. |
| 2487 | |
| 2488 | When doing a dynamic link, we create a .rel.got |
| 2489 | relocation entry to initialize the value. This |
| 2490 | is done in the finish_dynamic_symbol routine. */ |
| 2491 | if ((off & 1) != 0) |
| 2492 | off &= ~1; |
| 2493 | else |
| 2494 | { |
| 2495 | bfd_put_32 (output_bfd, relocation, |
| 2496 | htab->sgot->contents + off); |
| 2497 | h->got.offset |= 1; |
| 2498 | } |
| 2499 | } |
| 2500 | else |
| 2501 | unresolved_reloc = FALSE; |
| 2502 | } |
| 2503 | else |
| 2504 | { |
| 2505 | if (local_got_offsets == NULL) |
| 2506 | abort (); |
| 2507 | |
| 2508 | off = local_got_offsets[r_symndx]; |
| 2509 | |
| 2510 | /* The offset must always be a multiple of 4. We use |
| 2511 | the least significant bit to record whether we have |
| 2512 | already generated the necessary reloc. */ |
| 2513 | if ((off & 1) != 0) |
| 2514 | off &= ~1; |
| 2515 | else |
| 2516 | { |
| 2517 | bfd_put_32 (output_bfd, relocation, |
| 2518 | htab->sgot->contents + off); |
| 2519 | |
| 2520 | if (info->shared) |
| 2521 | { |
| 2522 | asection *s; |
| 2523 | Elf_Internal_Rela outrel; |
| 2524 | bfd_byte *loc; |
| 2525 | |
| 2526 | s = htab->srelgot; |
| 2527 | if (s == NULL) |
| 2528 | abort (); |
| 2529 | |
| 2530 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2531 | + htab->sgot->output_offset |
| 2532 | + off); |
| 2533 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2534 | loc = s->contents; |
| 2535 | loc += s->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2536 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2537 | } |
| 2538 | |
| 2539 | local_got_offsets[r_symndx] |= 1; |
| 2540 | } |
| 2541 | } |
| 2542 | |
| 2543 | if (off >= (bfd_vma) -2) |
| 2544 | abort (); |
| 2545 | |
| 2546 | relocation = htab->sgot->output_section->vma |
| 2547 | + htab->sgot->output_offset + off |
| 2548 | - htab->sgotplt->output_section->vma |
| 2549 | - htab->sgotplt->output_offset; |
| 2550 | break; |
| 2551 | |
| 2552 | case R_386_GOTOFF: |
| 2553 | /* Relocation is relative to the start of the global offset |
| 2554 | table. */ |
| 2555 | |
| 2556 | /* Check to make sure it isn't a protected function symbol |
| 2557 | for shared library since it may not be local when used |
| 2558 | as function address. */ |
| 2559 | if (info->shared |
| 2560 | && !info->executable |
| 2561 | && h |
| 2562 | && h->def_regular |
| 2563 | && h->type == STT_FUNC |
| 2564 | && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 2565 | { |
| 2566 | (*_bfd_error_handler) |
| 2567 | (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"), |
| 2568 | input_bfd, h->root.root.string); |
| 2569 | bfd_set_error (bfd_error_bad_value); |
| 2570 | return FALSE; |
| 2571 | } |
| 2572 | |
| 2573 | /* Note that sgot is not involved in this |
| 2574 | calculation. We always want the start of .got.plt. If we |
| 2575 | defined _GLOBAL_OFFSET_TABLE_ in a different way, as is |
| 2576 | permitted by the ABI, we might have to change this |
| 2577 | calculation. */ |
| 2578 | relocation -= htab->sgotplt->output_section->vma |
| 2579 | + htab->sgotplt->output_offset; |
| 2580 | break; |
| 2581 | |
| 2582 | case R_386_GOTPC: |
| 2583 | /* Use global offset table as symbol value. */ |
| 2584 | relocation = htab->sgotplt->output_section->vma |
| 2585 | + htab->sgotplt->output_offset; |
| 2586 | unresolved_reloc = FALSE; |
| 2587 | break; |
| 2588 | |
| 2589 | case R_386_PLT32: |
| 2590 | /* Relocation is to the entry for this symbol in the |
| 2591 | procedure linkage table. */ |
| 2592 | |
| 2593 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 2594 | without using the procedure linkage table. */ |
| 2595 | if (h == NULL) |
| 2596 | break; |
| 2597 | |
| 2598 | if (h->plt.offset == (bfd_vma) -1 |
| 2599 | || htab->splt == NULL) |
| 2600 | { |
| 2601 | /* We didn't make a PLT entry for this symbol. This |
| 2602 | happens when statically linking PIC code, or when |
| 2603 | using -Bsymbolic. */ |
| 2604 | break; |
| 2605 | } |
| 2606 | |
| 2607 | relocation = (htab->splt->output_section->vma |
| 2608 | + htab->splt->output_offset |
| 2609 | + h->plt.offset); |
| 2610 | unresolved_reloc = FALSE; |
| 2611 | break; |
| 2612 | |
| 2613 | case R_386_32: |
| 2614 | case R_386_PC32: |
| 2615 | if ((input_section->flags & SEC_ALLOC) == 0) |
| 2616 | break; |
| 2617 | |
| 2618 | if ((info->shared |
| 2619 | && (h == NULL |
| 2620 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2621 | || h->root.type != bfd_link_hash_undefweak) |
| 2622 | && (r_type != R_386_PC32 |
| 2623 | || !SYMBOL_CALLS_LOCAL (info, h))) |
| 2624 | || (ELIMINATE_COPY_RELOCS |
| 2625 | && !info->shared |
| 2626 | && h != NULL |
| 2627 | && h->dynindx != -1 |
| 2628 | && !h->non_got_ref |
| 2629 | && ((h->def_dynamic |
| 2630 | && !h->def_regular) |
| 2631 | || h->root.type == bfd_link_hash_undefweak |
| 2632 | || h->root.type == bfd_link_hash_undefined))) |
| 2633 | { |
| 2634 | Elf_Internal_Rela outrel; |
| 2635 | bfd_byte *loc; |
| 2636 | bfd_boolean skip, relocate; |
| 2637 | asection *sreloc; |
| 2638 | |
| 2639 | /* When generating a shared object, these relocations |
| 2640 | are copied into the output file to be resolved at run |
| 2641 | time. */ |
| 2642 | |
| 2643 | skip = FALSE; |
| 2644 | relocate = FALSE; |
| 2645 | |
| 2646 | outrel.r_offset = |
| 2647 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 2648 | rel->r_offset); |
| 2649 | if (outrel.r_offset == (bfd_vma) -1) |
| 2650 | skip = TRUE; |
| 2651 | else if (outrel.r_offset == (bfd_vma) -2) |
| 2652 | skip = TRUE, relocate = TRUE; |
| 2653 | outrel.r_offset += (input_section->output_section->vma |
| 2654 | + input_section->output_offset); |
| 2655 | |
| 2656 | if (skip) |
| 2657 | memset (&outrel, 0, sizeof outrel); |
| 2658 | else if (h != NULL |
| 2659 | && h->dynindx != -1 |
| 2660 | && (r_type == R_386_PC32 |
| 2661 | || !info->shared |
| 2662 | || !info->symbolic |
| 2663 | || !h->def_regular)) |
| 2664 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 2665 | else |
| 2666 | { |
| 2667 | /* This symbol is local, or marked to become local. */ |
| 2668 | relocate = TRUE; |
| 2669 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2670 | } |
| 2671 | |
| 2672 | sreloc = elf_section_data (input_section)->sreloc; |
| 2673 | if (sreloc == NULL) |
| 2674 | abort (); |
| 2675 | |
| 2676 | loc = sreloc->contents; |
| 2677 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2678 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2679 | |
| 2680 | /* If this reloc is against an external symbol, we do |
| 2681 | not want to fiddle with the addend. Otherwise, we |
| 2682 | need to include the symbol value so that it becomes |
| 2683 | an addend for the dynamic reloc. */ |
| 2684 | if (! relocate) |
| 2685 | continue; |
| 2686 | } |
| 2687 | break; |
| 2688 | |
| 2689 | case R_386_TLS_IE: |
| 2690 | if (info->shared) |
| 2691 | { |
| 2692 | Elf_Internal_Rela outrel; |
| 2693 | bfd_byte *loc; |
| 2694 | asection *sreloc; |
| 2695 | |
| 2696 | outrel.r_offset = rel->r_offset |
| 2697 | + input_section->output_section->vma |
| 2698 | + input_section->output_offset; |
| 2699 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2700 | sreloc = elf_section_data (input_section)->sreloc; |
| 2701 | if (sreloc == NULL) |
| 2702 | abort (); |
| 2703 | loc = sreloc->contents; |
| 2704 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2705 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2706 | } |
| 2707 | /* Fall through */ |
| 2708 | |
| 2709 | case R_386_TLS_GD: |
| 2710 | case R_386_TLS_GOTDESC: |
| 2711 | case R_386_TLS_DESC_CALL: |
| 2712 | case R_386_TLS_IE_32: |
| 2713 | case R_386_TLS_GOTIE: |
| 2714 | r_type = elf_i386_tls_transition (info, r_type, h == NULL); |
| 2715 | tls_type = GOT_UNKNOWN; |
| 2716 | if (h == NULL && local_got_offsets) |
| 2717 | tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx]; |
| 2718 | else if (h != NULL) |
| 2719 | { |
| 2720 | tls_type = elf_i386_hash_entry(h)->tls_type; |
| 2721 | if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE)) |
| 2722 | r_type = R_386_TLS_LE_32; |
| 2723 | } |
| 2724 | if (tls_type == GOT_TLS_IE) |
| 2725 | tls_type = GOT_TLS_IE_NEG; |
| 2726 | if (r_type == R_386_TLS_GD |
| 2727 | || r_type == R_386_TLS_GOTDESC |
| 2728 | || r_type == R_386_TLS_DESC_CALL) |
| 2729 | { |
| 2730 | if (tls_type == GOT_TLS_IE_POS) |
| 2731 | r_type = R_386_TLS_GOTIE; |
| 2732 | else if (tls_type & GOT_TLS_IE) |
| 2733 | r_type = R_386_TLS_IE_32; |
| 2734 | } |
| 2735 | |
| 2736 | if (r_type == R_386_TLS_LE_32) |
| 2737 | { |
| 2738 | BFD_ASSERT (! unresolved_reloc); |
| 2739 | if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) |
| 2740 | { |
| 2741 | unsigned int val, type; |
| 2742 | bfd_vma roff; |
| 2743 | |
| 2744 | /* GD->LE transition. */ |
| 2745 | BFD_ASSERT (rel->r_offset >= 2); |
| 2746 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2747 | BFD_ASSERT (type == 0x8d || type == 0x04); |
| 2748 | BFD_ASSERT (rel->r_offset + 9 <= input_section->size); |
| 2749 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2750 | contents + rel->r_offset + 4) |
| 2751 | == 0xe8); |
| 2752 | BFD_ASSERT (rel + 1 < relend); |
| 2753 | BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); |
| 2754 | roff = rel->r_offset + 5; |
| 2755 | val = bfd_get_8 (input_bfd, |
| 2756 | contents + rel->r_offset - 1); |
| 2757 | if (type == 0x04) |
| 2758 | { |
| 2759 | /* leal foo(,%reg,1), %eax; call ___tls_get_addr |
| 2760 | Change it into: |
| 2761 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2762 | (6 byte form of subl). */ |
| 2763 | BFD_ASSERT (rel->r_offset >= 3); |
| 2764 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2765 | contents + rel->r_offset - 3) |
| 2766 | == 0x8d); |
| 2767 | BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); |
| 2768 | memcpy (contents + rel->r_offset - 3, |
| 2769 | "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
| 2770 | } |
| 2771 | else |
| 2772 | { |
| 2773 | BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); |
| 2774 | if (rel->r_offset + 10 <= input_section->size |
| 2775 | && bfd_get_8 (input_bfd, |
| 2776 | contents + rel->r_offset + 9) == 0x90) |
| 2777 | { |
| 2778 | /* leal foo(%reg), %eax; call ___tls_get_addr; nop |
| 2779 | Change it into: |
| 2780 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2781 | (6 byte form of subl). */ |
| 2782 | memcpy (contents + rel->r_offset - 2, |
| 2783 | "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
| 2784 | roff = rel->r_offset + 6; |
| 2785 | } |
| 2786 | else |
| 2787 | { |
| 2788 | /* leal foo(%reg), %eax; call ___tls_get_addr |
| 2789 | Change it into: |
| 2790 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2791 | (5 byte form of subl). */ |
| 2792 | memcpy (contents + rel->r_offset - 2, |
| 2793 | "\x65\xa1\0\0\0\0\x2d\0\0\0", 11); |
| 2794 | } |
| 2795 | } |
| 2796 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2797 | contents + roff); |
| 2798 | /* Skip R_386_PLT32. */ |
| 2799 | rel++; |
| 2800 | continue; |
| 2801 | } |
| 2802 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) |
| 2803 | { |
| 2804 | /* GDesc -> LE transition. |
| 2805 | It's originally something like: |
| 2806 | leal x@tlsdesc(%ebx), %eax |
| 2807 | |
| 2808 | leal x@ntpoff, %eax |
| 2809 | |
| 2810 | Registers other than %eax may be set up here. */ |
| 2811 | |
| 2812 | unsigned int val, type; |
| 2813 | bfd_vma roff; |
| 2814 | |
| 2815 | /* First, make sure it's a leal adding ebx to a |
| 2816 | 32-bit offset into any register, although it's |
| 2817 | probably almost always going to be eax. */ |
| 2818 | roff = rel->r_offset; |
| 2819 | BFD_ASSERT (roff >= 2); |
| 2820 | type = bfd_get_8 (input_bfd, contents + roff - 2); |
| 2821 | BFD_ASSERT (type == 0x8d); |
| 2822 | val = bfd_get_8 (input_bfd, contents + roff - 1); |
| 2823 | BFD_ASSERT ((val & 0xc7) == 0x83); |
| 2824 | BFD_ASSERT (roff + 4 <= input_section->size); |
| 2825 | |
| 2826 | /* Now modify the instruction as appropriate. */ |
| 2827 | /* aoliva FIXME: remove the above and xor the byte |
| 2828 | below with 0x86. */ |
| 2829 | bfd_put_8 (output_bfd, val ^ 0x86, |
| 2830 | contents + roff - 1); |
| 2831 | bfd_put_32 (output_bfd, -tpoff (info, relocation), |
| 2832 | contents + roff); |
| 2833 | continue; |
| 2834 | } |
| 2835 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) |
| 2836 | { |
| 2837 | /* GDesc -> LE transition. |
| 2838 | It's originally: |
| 2839 | call *(%eax) |
| 2840 | Turn it into: |
| 2841 | nop; nop */ |
| 2842 | |
| 2843 | unsigned int val, type; |
| 2844 | bfd_vma roff; |
| 2845 | |
| 2846 | /* First, make sure it's a call *(%eax). */ |
| 2847 | roff = rel->r_offset; |
| 2848 | BFD_ASSERT (roff + 2 <= input_section->size); |
| 2849 | type = bfd_get_8 (input_bfd, contents + roff); |
| 2850 | BFD_ASSERT (type == 0xff); |
| 2851 | val = bfd_get_8 (input_bfd, contents + roff + 1); |
| 2852 | BFD_ASSERT (val == 0x10); |
| 2853 | |
| 2854 | /* Now modify the instruction as appropriate. */ |
| 2855 | bfd_put_8 (output_bfd, 0x90, contents + roff); |
| 2856 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 2857 | continue; |
| 2858 | } |
| 2859 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE) |
| 2860 | { |
| 2861 | unsigned int val, type; |
| 2862 | |
| 2863 | /* IE->LE transition: |
| 2864 | Originally it can be one of: |
| 2865 | movl foo, %eax |
| 2866 | movl foo, %reg |
| 2867 | addl foo, %reg |
| 2868 | We change it into: |
| 2869 | movl $foo, %eax |
| 2870 | movl $foo, %reg |
| 2871 | addl $foo, %reg. */ |
| 2872 | BFD_ASSERT (rel->r_offset >= 1); |
| 2873 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2874 | BFD_ASSERT (rel->r_offset + 4 <= input_section->size); |
| 2875 | if (val == 0xa1) |
| 2876 | { |
| 2877 | /* movl foo, %eax. */ |
| 2878 | bfd_put_8 (output_bfd, 0xb8, |
| 2879 | contents + rel->r_offset - 1); |
| 2880 | } |
| 2881 | else |
| 2882 | { |
| 2883 | BFD_ASSERT (rel->r_offset >= 2); |
| 2884 | type = bfd_get_8 (input_bfd, |
| 2885 | contents + rel->r_offset - 2); |
| 2886 | switch (type) |
| 2887 | { |
| 2888 | case 0x8b: |
| 2889 | /* movl */ |
| 2890 | BFD_ASSERT ((val & 0xc7) == 0x05); |
| 2891 | bfd_put_8 (output_bfd, 0xc7, |
| 2892 | contents + rel->r_offset - 2); |
| 2893 | bfd_put_8 (output_bfd, |
| 2894 | 0xc0 | ((val >> 3) & 7), |
| 2895 | contents + rel->r_offset - 1); |
| 2896 | break; |
| 2897 | case 0x03: |
| 2898 | /* addl */ |
| 2899 | BFD_ASSERT ((val & 0xc7) == 0x05); |
| 2900 | bfd_put_8 (output_bfd, 0x81, |
| 2901 | contents + rel->r_offset - 2); |
| 2902 | bfd_put_8 (output_bfd, |
| 2903 | 0xc0 | ((val >> 3) & 7), |
| 2904 | contents + rel->r_offset - 1); |
| 2905 | break; |
| 2906 | default: |
| 2907 | BFD_FAIL (); |
| 2908 | break; |
| 2909 | } |
| 2910 | } |
| 2911 | bfd_put_32 (output_bfd, -tpoff (info, relocation), |
| 2912 | contents + rel->r_offset); |
| 2913 | continue; |
| 2914 | } |
| 2915 | else |
| 2916 | { |
| 2917 | unsigned int val, type; |
| 2918 | |
| 2919 | /* {IE_32,GOTIE}->LE transition: |
| 2920 | Originally it can be one of: |
| 2921 | subl foo(%reg1), %reg2 |
| 2922 | movl foo(%reg1), %reg2 |
| 2923 | addl foo(%reg1), %reg2 |
| 2924 | We change it into: |
| 2925 | subl $foo, %reg2 |
| 2926 | movl $foo, %reg2 (6 byte form) |
| 2927 | addl $foo, %reg2. */ |
| 2928 | BFD_ASSERT (rel->r_offset >= 2); |
| 2929 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2930 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2931 | BFD_ASSERT (rel->r_offset + 4 <= input_section->size); |
| 2932 | BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4); |
| 2933 | if (type == 0x8b) |
| 2934 | { |
| 2935 | /* movl */ |
| 2936 | bfd_put_8 (output_bfd, 0xc7, |
| 2937 | contents + rel->r_offset - 2); |
| 2938 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 2939 | contents + rel->r_offset - 1); |
| 2940 | } |
| 2941 | else if (type == 0x2b) |
| 2942 | { |
| 2943 | /* subl */ |
| 2944 | bfd_put_8 (output_bfd, 0x81, |
| 2945 | contents + rel->r_offset - 2); |
| 2946 | bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), |
| 2947 | contents + rel->r_offset - 1); |
| 2948 | } |
| 2949 | else if (type == 0x03) |
| 2950 | { |
| 2951 | /* addl */ |
| 2952 | bfd_put_8 (output_bfd, 0x81, |
| 2953 | contents + rel->r_offset - 2); |
| 2954 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 2955 | contents + rel->r_offset - 1); |
| 2956 | } |
| 2957 | else |
| 2958 | BFD_FAIL (); |
| 2959 | if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE) |
| 2960 | bfd_put_32 (output_bfd, -tpoff (info, relocation), |
| 2961 | contents + rel->r_offset); |
| 2962 | else |
| 2963 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2964 | contents + rel->r_offset); |
| 2965 | continue; |
| 2966 | } |
| 2967 | } |
| 2968 | |
| 2969 | if (htab->sgot == NULL) |
| 2970 | abort (); |
| 2971 | |
| 2972 | if (h != NULL) |
| 2973 | { |
| 2974 | off = h->got.offset; |
| 2975 | offplt = elf_i386_hash_entry (h)->tlsdesc_got; |
| 2976 | } |
| 2977 | else |
| 2978 | { |
| 2979 | if (local_got_offsets == NULL) |
| 2980 | abort (); |
| 2981 | |
| 2982 | off = local_got_offsets[r_symndx]; |
| 2983 | offplt = local_tlsdesc_gotents[r_symndx]; |
| 2984 | } |
| 2985 | |
| 2986 | if ((off & 1) != 0) |
| 2987 | off &= ~1; |
| 2988 | else |
| 2989 | { |
| 2990 | Elf_Internal_Rela outrel; |
| 2991 | bfd_byte *loc; |
| 2992 | int dr_type, indx; |
| 2993 | asection *sreloc; |
| 2994 | |
| 2995 | if (htab->srelgot == NULL) |
| 2996 | abort (); |
| 2997 | |
| 2998 | indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| 2999 | |
| 3000 | if (GOT_TLS_GDESC_P (tls_type)) |
| 3001 | { |
| 3002 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC); |
| 3003 | BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8 |
| 3004 | <= htab->sgotplt->size); |
| 3005 | outrel.r_offset = (htab->sgotplt->output_section->vma |
| 3006 | + htab->sgotplt->output_offset |
| 3007 | + offplt |
| 3008 | + htab->sgotplt_jump_table_size); |
| 3009 | sreloc = htab->srelplt; |
| 3010 | loc = sreloc->contents; |
| 3011 | loc += sreloc->reloc_count++ |
| 3012 | * sizeof (Elf32_External_Rel); |
| 3013 | BFD_ASSERT (loc + sizeof (Elf32_External_Rel) |
| 3014 | <= sreloc->contents + sreloc->size); |
| 3015 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3016 | if (indx == 0) |
| 3017 | { |
| 3018 | BFD_ASSERT (! unresolved_reloc); |
| 3019 | bfd_put_32 (output_bfd, |
| 3020 | relocation - dtpoff_base (info), |
| 3021 | htab->sgotplt->contents + offplt |
| 3022 | + htab->sgotplt_jump_table_size + 4); |
| 3023 | } |
| 3024 | else |
| 3025 | { |
| 3026 | bfd_put_32 (output_bfd, 0, |
| 3027 | htab->sgotplt->contents + offplt |
| 3028 | + htab->sgotplt_jump_table_size + 4); |
| 3029 | } |
| 3030 | } |
| 3031 | |
| 3032 | sreloc = htab->srelgot; |
| 3033 | |
| 3034 | outrel.r_offset = (htab->sgot->output_section->vma |
| 3035 | + htab->sgot->output_offset + off); |
| 3036 | |
| 3037 | if (GOT_TLS_GD_P (tls_type)) |
| 3038 | dr_type = R_386_TLS_DTPMOD32; |
| 3039 | else if (GOT_TLS_GDESC_P (tls_type)) |
| 3040 | goto dr_done; |
| 3041 | else if (tls_type == GOT_TLS_IE_POS) |
| 3042 | dr_type = R_386_TLS_TPOFF; |
| 3043 | else |
| 3044 | dr_type = R_386_TLS_TPOFF32; |
| 3045 | |
| 3046 | if (dr_type == R_386_TLS_TPOFF && indx == 0) |
| 3047 | bfd_put_32 (output_bfd, relocation - dtpoff_base (info), |
| 3048 | htab->sgot->contents + off); |
| 3049 | else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) |
| 3050 | bfd_put_32 (output_bfd, dtpoff_base (info) - relocation, |
| 3051 | htab->sgot->contents + off); |
| 3052 | else if (dr_type != R_386_TLS_DESC) |
| 3053 | bfd_put_32 (output_bfd, 0, |
| 3054 | htab->sgot->contents + off); |
| 3055 | outrel.r_info = ELF32_R_INFO (indx, dr_type); |
| 3056 | |
| 3057 | loc = sreloc->contents; |
| 3058 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3059 | BFD_ASSERT (loc + sizeof (Elf32_External_Rel) |
| 3060 | <= sreloc->contents + sreloc->size); |
| 3061 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3062 | |
| 3063 | if (GOT_TLS_GD_P (tls_type)) |
| 3064 | { |
| 3065 | if (indx == 0) |
| 3066 | { |
| 3067 | BFD_ASSERT (! unresolved_reloc); |
| 3068 | bfd_put_32 (output_bfd, |
| 3069 | relocation - dtpoff_base (info), |
| 3070 | htab->sgot->contents + off + 4); |
| 3071 | } |
| 3072 | else |
| 3073 | { |
| 3074 | bfd_put_32 (output_bfd, 0, |
| 3075 | htab->sgot->contents + off + 4); |
| 3076 | outrel.r_info = ELF32_R_INFO (indx, |
| 3077 | R_386_TLS_DTPOFF32); |
| 3078 | outrel.r_offset += 4; |
| 3079 | sreloc->reloc_count++; |
| 3080 | loc += sizeof (Elf32_External_Rel); |
| 3081 | BFD_ASSERT (loc + sizeof (Elf32_External_Rel) |
| 3082 | <= sreloc->contents + sreloc->size); |
| 3083 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3084 | } |
| 3085 | } |
| 3086 | else if (tls_type == GOT_TLS_IE_BOTH) |
| 3087 | { |
| 3088 | bfd_put_32 (output_bfd, |
| 3089 | indx == 0 ? relocation - dtpoff_base (info) : 0, |
| 3090 | htab->sgot->contents + off + 4); |
| 3091 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); |
| 3092 | outrel.r_offset += 4; |
| 3093 | sreloc->reloc_count++; |
| 3094 | loc += sizeof (Elf32_External_Rel); |
| 3095 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3096 | } |
| 3097 | |
| 3098 | dr_done: |
| 3099 | if (h != NULL) |
| 3100 | h->got.offset |= 1; |
| 3101 | else |
| 3102 | local_got_offsets[r_symndx] |= 1; |
| 3103 | } |
| 3104 | |
| 3105 | if (off >= (bfd_vma) -2 |
| 3106 | && ! GOT_TLS_GDESC_P (tls_type)) |
| 3107 | abort (); |
| 3108 | if (r_type == R_386_TLS_GOTDESC |
| 3109 | || r_type == R_386_TLS_DESC_CALL) |
| 3110 | { |
| 3111 | relocation = htab->sgotplt_jump_table_size + offplt; |
| 3112 | unresolved_reloc = FALSE; |
| 3113 | } |
| 3114 | else if (r_type == ELF32_R_TYPE (rel->r_info)) |
| 3115 | { |
| 3116 | bfd_vma g_o_t = htab->sgotplt->output_section->vma |
| 3117 | + htab->sgotplt->output_offset; |
| 3118 | relocation = htab->sgot->output_section->vma |
| 3119 | + htab->sgot->output_offset + off - g_o_t; |
| 3120 | if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) |
| 3121 | && tls_type == GOT_TLS_IE_BOTH) |
| 3122 | relocation += 4; |
| 3123 | if (r_type == R_386_TLS_IE) |
| 3124 | relocation += g_o_t; |
| 3125 | unresolved_reloc = FALSE; |
| 3126 | } |
| 3127 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) |
| 3128 | { |
| 3129 | unsigned int val, type; |
| 3130 | bfd_vma roff; |
| 3131 | |
| 3132 | /* GD->IE transition. */ |
| 3133 | BFD_ASSERT (rel->r_offset >= 2); |
| 3134 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 3135 | BFD_ASSERT (type == 0x8d || type == 0x04); |
| 3136 | BFD_ASSERT (rel->r_offset + 9 <= input_section->size); |
| 3137 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) |
| 3138 | == 0xe8); |
| 3139 | BFD_ASSERT (rel + 1 < relend); |
| 3140 | BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); |
| 3141 | roff = rel->r_offset - 3; |
| 3142 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 3143 | if (type == 0x04) |
| 3144 | { |
| 3145 | /* leal foo(,%reg,1), %eax; call ___tls_get_addr |
| 3146 | Change it into: |
| 3147 | movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ |
| 3148 | BFD_ASSERT (rel->r_offset >= 3); |
| 3149 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 3150 | contents + rel->r_offset - 3) |
| 3151 | == 0x8d); |
| 3152 | BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3)); |
| 3153 | val >>= 3; |
| 3154 | } |
| 3155 | else |
| 3156 | { |
| 3157 | /* leal foo(%reg), %eax; call ___tls_get_addr; nop |
| 3158 | Change it into: |
| 3159 | movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ |
| 3160 | BFD_ASSERT (rel->r_offset + 10 <= input_section->size); |
| 3161 | BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); |
| 3162 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 3163 | contents + rel->r_offset + 9) |
| 3164 | == 0x90); |
| 3165 | roff = rel->r_offset - 2; |
| 3166 | } |
| 3167 | memcpy (contents + roff, |
| 3168 | "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); |
| 3169 | contents[roff + 7] = 0x80 | (val & 7); |
| 3170 | /* If foo is used only with foo@gotntpoff(%reg) and |
| 3171 | foo@indntpoff, but not with foo@gottpoff(%reg), change |
| 3172 | subl $foo@gottpoff(%reg), %eax |
| 3173 | into: |
| 3174 | addl $foo@gotntpoff(%reg), %eax. */ |
| 3175 | if (r_type == R_386_TLS_GOTIE) |
| 3176 | { |
| 3177 | contents[roff + 6] = 0x03; |
| 3178 | if (tls_type == GOT_TLS_IE_BOTH) |
| 3179 | off += 4; |
| 3180 | } |
| 3181 | bfd_put_32 (output_bfd, |
| 3182 | htab->sgot->output_section->vma |
| 3183 | + htab->sgot->output_offset + off |
| 3184 | - htab->sgotplt->output_section->vma |
| 3185 | - htab->sgotplt->output_offset, |
| 3186 | contents + roff + 8); |
| 3187 | /* Skip R_386_PLT32. */ |
| 3188 | rel++; |
| 3189 | continue; |
| 3190 | } |
| 3191 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) |
| 3192 | { |
| 3193 | /* GDesc -> IE transition. |
| 3194 | It's originally something like: |
| 3195 | leal x@tlsdesc(%ebx), %eax |
| 3196 | |
| 3197 | Change it to: |
| 3198 | movl x@gotntpoff(%ebx), %eax # before nop; nop |
| 3199 | or: |
| 3200 | movl x@gottpoff(%ebx), %eax # before negl %eax |
| 3201 | |
| 3202 | Registers other than %eax may be set up here. */ |
| 3203 | |
| 3204 | unsigned int val, type; |
| 3205 | bfd_vma roff; |
| 3206 | |
| 3207 | /* First, make sure it's a leal adding ebx to a 32-bit |
| 3208 | offset into any register, although it's probably |
| 3209 | almost always going to be eax. */ |
| 3210 | roff = rel->r_offset; |
| 3211 | BFD_ASSERT (roff >= 2); |
| 3212 | type = bfd_get_8 (input_bfd, contents + roff - 2); |
| 3213 | BFD_ASSERT (type == 0x8d); |
| 3214 | val = bfd_get_8 (input_bfd, contents + roff - 1); |
| 3215 | BFD_ASSERT ((val & 0xc7) == 0x83); |
| 3216 | BFD_ASSERT (roff + 4 <= input_section->size); |
| 3217 | |
| 3218 | /* Now modify the instruction as appropriate. */ |
| 3219 | /* To turn a leal into a movl in the form we use it, it |
| 3220 | suffices to change the first byte from 0x8d to 0x8b. |
| 3221 | aoliva FIXME: should we decide to keep the leal, all |
| 3222 | we have to do is remove the statement below, and |
| 3223 | adjust the relaxation of R_386_TLS_DESC_CALL. */ |
| 3224 | bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); |
| 3225 | |
| 3226 | if (tls_type == GOT_TLS_IE_BOTH) |
| 3227 | off += 4; |
| 3228 | |
| 3229 | bfd_put_32 (output_bfd, |
| 3230 | htab->sgot->output_section->vma |
| 3231 | + htab->sgot->output_offset + off |
| 3232 | - htab->sgotplt->output_section->vma |
| 3233 | - htab->sgotplt->output_offset, |
| 3234 | contents + roff); |
| 3235 | continue; |
| 3236 | } |
| 3237 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) |
| 3238 | { |
| 3239 | /* GDesc -> IE transition. |
| 3240 | It's originally: |
| 3241 | call *(%eax) |
| 3242 | |
| 3243 | Change it to: |
| 3244 | nop; nop |
| 3245 | or |
| 3246 | negl %eax |
| 3247 | depending on how we transformed the TLS_GOTDESC above. |
| 3248 | */ |
| 3249 | |
| 3250 | unsigned int val, type; |
| 3251 | bfd_vma roff; |
| 3252 | |
| 3253 | /* First, make sure it's a call *(%eax). */ |
| 3254 | roff = rel->r_offset; |
| 3255 | BFD_ASSERT (roff + 2 <= input_section->size); |
| 3256 | type = bfd_get_8 (input_bfd, contents + roff); |
| 3257 | BFD_ASSERT (type == 0xff); |
| 3258 | val = bfd_get_8 (input_bfd, contents + roff + 1); |
| 3259 | BFD_ASSERT (val == 0x10); |
| 3260 | |
| 3261 | /* Now modify the instruction as appropriate. */ |
| 3262 | if (tls_type != GOT_TLS_IE_NEG) |
| 3263 | { |
| 3264 | /* nop; nop */ |
| 3265 | bfd_put_8 (output_bfd, 0x90, contents + roff); |
| 3266 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 3267 | } |
| 3268 | else |
| 3269 | { |
| 3270 | /* negl %eax */ |
| 3271 | bfd_put_8 (output_bfd, 0xf7, contents + roff); |
| 3272 | bfd_put_8 (output_bfd, 0xd8, contents + roff + 1); |
| 3273 | } |
| 3274 | |
| 3275 | continue; |
| 3276 | } |
| 3277 | else |
| 3278 | BFD_ASSERT (FALSE); |
| 3279 | break; |
| 3280 | |
| 3281 | case R_386_TLS_LDM: |
| 3282 | if (! info->shared) |
| 3283 | { |
| 3284 | unsigned int val; |
| 3285 | |
| 3286 | /* LD->LE transition: |
| 3287 | Ensure it is: |
| 3288 | leal foo(%reg), %eax; call ___tls_get_addr. |
| 3289 | We change it into: |
| 3290 | movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */ |
| 3291 | BFD_ASSERT (rel->r_offset >= 2); |
| 3292 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2) |
| 3293 | == 0x8d); |
| 3294 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 3295 | BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4); |
| 3296 | BFD_ASSERT (rel->r_offset + 9 <= input_section->size); |
| 3297 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) |
| 3298 | == 0xe8); |
| 3299 | BFD_ASSERT (rel + 1 < relend); |
| 3300 | BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); |
| 3301 | memcpy (contents + rel->r_offset - 2, |
| 3302 | "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); |
| 3303 | /* Skip R_386_PLT32. */ |
| 3304 | rel++; |
| 3305 | continue; |
| 3306 | } |
| 3307 | |
| 3308 | if (htab->sgot == NULL) |
| 3309 | abort (); |
| 3310 | |
| 3311 | off = htab->tls_ldm_got.offset; |
| 3312 | if (off & 1) |
| 3313 | off &= ~1; |
| 3314 | else |
| 3315 | { |
| 3316 | Elf_Internal_Rela outrel; |
| 3317 | bfd_byte *loc; |
| 3318 | |
| 3319 | if (htab->srelgot == NULL) |
| 3320 | abort (); |
| 3321 | |
| 3322 | outrel.r_offset = (htab->sgot->output_section->vma |
| 3323 | + htab->sgot->output_offset + off); |
| 3324 | |
| 3325 | bfd_put_32 (output_bfd, 0, |
| 3326 | htab->sgot->contents + off); |
| 3327 | bfd_put_32 (output_bfd, 0, |
| 3328 | htab->sgot->contents + off + 4); |
| 3329 | outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); |
| 3330 | loc = htab->srelgot->contents; |
| 3331 | loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3332 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3333 | htab->tls_ldm_got.offset |= 1; |
| 3334 | } |
| 3335 | relocation = htab->sgot->output_section->vma |
| 3336 | + htab->sgot->output_offset + off |
| 3337 | - htab->sgotplt->output_section->vma |
| 3338 | - htab->sgotplt->output_offset; |
| 3339 | unresolved_reloc = FALSE; |
| 3340 | break; |
| 3341 | |
| 3342 | case R_386_TLS_LDO_32: |
| 3343 | if (info->shared || (input_section->flags & SEC_CODE) == 0) |
| 3344 | relocation -= dtpoff_base (info); |
| 3345 | else |
| 3346 | /* When converting LDO to LE, we must negate. */ |
| 3347 | relocation = -tpoff (info, relocation); |
| 3348 | break; |
| 3349 | |
| 3350 | case R_386_TLS_LE_32: |
| 3351 | case R_386_TLS_LE: |
| 3352 | if (info->shared) |
| 3353 | { |
| 3354 | Elf_Internal_Rela outrel; |
| 3355 | asection *sreloc; |
| 3356 | bfd_byte *loc; |
| 3357 | int indx; |
| 3358 | |
| 3359 | outrel.r_offset = rel->r_offset |
| 3360 | + input_section->output_section->vma |
| 3361 | + input_section->output_offset; |
| 3362 | if (h != NULL && h->dynindx != -1) |
| 3363 | indx = h->dynindx; |
| 3364 | else |
| 3365 | indx = 0; |
| 3366 | if (r_type == R_386_TLS_LE_32) |
| 3367 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); |
| 3368 | else |
| 3369 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); |
| 3370 | sreloc = elf_section_data (input_section)->sreloc; |
| 3371 | if (sreloc == NULL) |
| 3372 | abort (); |
| 3373 | loc = sreloc->contents; |
| 3374 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3375 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3376 | if (indx) |
| 3377 | continue; |
| 3378 | else if (r_type == R_386_TLS_LE_32) |
| 3379 | relocation = dtpoff_base (info) - relocation; |
| 3380 | else |
| 3381 | relocation -= dtpoff_base (info); |
| 3382 | } |
| 3383 | else if (r_type == R_386_TLS_LE_32) |
| 3384 | relocation = tpoff (info, relocation); |
| 3385 | else |
| 3386 | relocation = -tpoff (info, relocation); |
| 3387 | break; |
| 3388 | |
| 3389 | default: |
| 3390 | break; |
| 3391 | } |
| 3392 | |
| 3393 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 3394 | because such sections are not SEC_ALLOC and thus ld.so will |
| 3395 | not process them. */ |
| 3396 | if (unresolved_reloc |
| 3397 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 3398 | && h->def_dynamic)) |
| 3399 | { |
| 3400 | (*_bfd_error_handler) |
| 3401 | (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), |
| 3402 | input_bfd, |
| 3403 | input_section, |
| 3404 | (long) rel->r_offset, |
| 3405 | howto->name, |
| 3406 | h->root.root.string); |
| 3407 | return FALSE; |
| 3408 | } |
| 3409 | |
| 3410 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 3411 | contents, rel->r_offset, |
| 3412 | relocation, 0); |
| 3413 | |
| 3414 | if (r != bfd_reloc_ok) |
| 3415 | { |
| 3416 | const char *name; |
| 3417 | |
| 3418 | if (h != NULL) |
| 3419 | name = h->root.root.string; |
| 3420 | else |
| 3421 | { |
| 3422 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 3423 | symtab_hdr->sh_link, |
| 3424 | sym->st_name); |
| 3425 | if (name == NULL) |
| 3426 | return FALSE; |
| 3427 | if (*name == '\0') |
| 3428 | name = bfd_section_name (input_bfd, sec); |
| 3429 | } |
| 3430 | |
| 3431 | if (r == bfd_reloc_overflow) |
| 3432 | { |
| 3433 | if (! ((*info->callbacks->reloc_overflow) |
| 3434 | (info, (h ? &h->root : NULL), name, howto->name, |
| 3435 | (bfd_vma) 0, input_bfd, input_section, |
| 3436 | rel->r_offset))) |
| 3437 | return FALSE; |
| 3438 | } |
| 3439 | else |
| 3440 | { |
| 3441 | (*_bfd_error_handler) |
| 3442 | (_("%B(%A+0x%lx): reloc against `%s': error %d"), |
| 3443 | input_bfd, input_section, |
| 3444 | (long) rel->r_offset, name, (int) r); |
| 3445 | return FALSE; |
| 3446 | } |
| 3447 | } |
| 3448 | } |
| 3449 | |
| 3450 | return TRUE; |
| 3451 | } |
| 3452 | |
| 3453 | /* Finish up dynamic symbol handling. We set the contents of various |
| 3454 | dynamic sections here. */ |
| 3455 | |
| 3456 | static bfd_boolean |
| 3457 | elf_i386_finish_dynamic_symbol (bfd *output_bfd, |
| 3458 | struct bfd_link_info *info, |
| 3459 | struct elf_link_hash_entry *h, |
| 3460 | Elf_Internal_Sym *sym) |
| 3461 | { |
| 3462 | struct elf_i386_link_hash_table *htab; |
| 3463 | |
| 3464 | htab = elf_i386_hash_table (info); |
| 3465 | |
| 3466 | if (h->plt.offset != (bfd_vma) -1) |
| 3467 | { |
| 3468 | bfd_vma plt_index; |
| 3469 | bfd_vma got_offset; |
| 3470 | Elf_Internal_Rela rel; |
| 3471 | bfd_byte *loc; |
| 3472 | |
| 3473 | /* This symbol has an entry in the procedure linkage table. Set |
| 3474 | it up. */ |
| 3475 | |
| 3476 | if (h->dynindx == -1 |
| 3477 | || htab->splt == NULL |
| 3478 | || htab->sgotplt == NULL |
| 3479 | || htab->srelplt == NULL) |
| 3480 | abort (); |
| 3481 | |
| 3482 | /* Get the index in the procedure linkage table which |
| 3483 | corresponds to this symbol. This is the index of this symbol |
| 3484 | in all the symbols for which we are making plt entries. The |
| 3485 | first entry in the procedure linkage table is reserved. */ |
| 3486 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 3487 | |
| 3488 | /* Get the offset into the .got table of the entry that |
| 3489 | corresponds to this function. Each .got entry is 4 bytes. |
| 3490 | The first three are reserved. */ |
| 3491 | got_offset = (plt_index + 3) * 4; |
| 3492 | |
| 3493 | /* Fill in the entry in the procedure linkage table. */ |
| 3494 | if (! info->shared) |
| 3495 | { |
| 3496 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry, |
| 3497 | PLT_ENTRY_SIZE); |
| 3498 | bfd_put_32 (output_bfd, |
| 3499 | (htab->sgotplt->output_section->vma |
| 3500 | + htab->sgotplt->output_offset |
| 3501 | + got_offset), |
| 3502 | htab->splt->contents + h->plt.offset + 2); |
| 3503 | |
| 3504 | if (htab->is_vxworks) |
| 3505 | { |
| 3506 | int s, k, reloc_index; |
| 3507 | |
| 3508 | /* Create the R_386_32 relocation referencing the GOT |
| 3509 | for this PLT entry. */ |
| 3510 | |
| 3511 | /* S: Current slot number (zero-based). */ |
| 3512 | s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE; |
| 3513 | /* K: Number of relocations for PLTResolve. */ |
| 3514 | if (info->shared) |
| 3515 | k = PLTRESOLVE_RELOCS_SHLIB; |
| 3516 | else |
| 3517 | k = PLTRESOLVE_RELOCS; |
| 3518 | /* Skip the PLTresolve relocations, and the relocations for |
| 3519 | the other PLT slots. */ |
| 3520 | reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS; |
| 3521 | loc = (htab->srelplt2->contents + reloc_index |
| 3522 | * sizeof (Elf32_External_Rel)); |
| 3523 | |
| 3524 | rel.r_offset = (htab->splt->output_section->vma |
| 3525 | + htab->splt->output_offset |
| 3526 | + h->plt.offset + 2), |
| 3527 | rel.r_info = ELF32_R_INFO (htab->hgot->indx, R_386_32); |
| 3528 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3529 | |
| 3530 | /* Create the R_386_32 relocation referencing the beginning of |
| 3531 | the PLT for this GOT entry. */ |
| 3532 | rel.r_offset = (htab->sgotplt->output_section->vma |
| 3533 | + htab->sgotplt->output_offset |
| 3534 | + got_offset); |
| 3535 | rel.r_info = ELF32_R_INFO (htab->hplt->indx, R_386_32); |
| 3536 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 3537 | loc + sizeof (Elf32_External_Rel)); |
| 3538 | } |
| 3539 | } |
| 3540 | else |
| 3541 | { |
| 3542 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry, |
| 3543 | PLT_ENTRY_SIZE); |
| 3544 | bfd_put_32 (output_bfd, got_offset, |
| 3545 | htab->splt->contents + h->plt.offset + 2); |
| 3546 | } |
| 3547 | |
| 3548 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), |
| 3549 | htab->splt->contents + h->plt.offset + 7); |
| 3550 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| 3551 | htab->splt->contents + h->plt.offset + 12); |
| 3552 | |
| 3553 | /* Fill in the entry in the global offset table. */ |
| 3554 | bfd_put_32 (output_bfd, |
| 3555 | (htab->splt->output_section->vma |
| 3556 | + htab->splt->output_offset |
| 3557 | + h->plt.offset |
| 3558 | + 6), |
| 3559 | htab->sgotplt->contents + got_offset); |
| 3560 | |
| 3561 | /* Fill in the entry in the .rel.plt section. */ |
| 3562 | rel.r_offset = (htab->sgotplt->output_section->vma |
| 3563 | + htab->sgotplt->output_offset |
| 3564 | + got_offset); |
| 3565 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); |
| 3566 | loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel); |
| 3567 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3568 | |
| 3569 | if (!h->def_regular) |
| 3570 | { |
| 3571 | /* Mark the symbol as undefined, rather than as defined in |
| 3572 | the .plt section. Leave the value if there were any |
| 3573 | relocations where pointer equality matters (this is a clue |
| 3574 | for the dynamic linker, to make function pointer |
| 3575 | comparisons work between an application and shared |
| 3576 | library), otherwise set it to zero. If a function is only |
| 3577 | called from a binary, there is no need to slow down |
| 3578 | shared libraries because of that. */ |
| 3579 | sym->st_shndx = SHN_UNDEF; |
| 3580 | if (!h->pointer_equality_needed) |
| 3581 | sym->st_value = 0; |
| 3582 | } |
| 3583 | } |
| 3584 | |
| 3585 | if (h->got.offset != (bfd_vma) -1 |
| 3586 | && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type) |
| 3587 | && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0) |
| 3588 | { |
| 3589 | Elf_Internal_Rela rel; |
| 3590 | bfd_byte *loc; |
| 3591 | |
| 3592 | /* This symbol has an entry in the global offset table. Set it |
| 3593 | up. */ |
| 3594 | |
| 3595 | if (htab->sgot == NULL || htab->srelgot == NULL) |
| 3596 | abort (); |
| 3597 | |
| 3598 | rel.r_offset = (htab->sgot->output_section->vma |
| 3599 | + htab->sgot->output_offset |
| 3600 | + (h->got.offset & ~(bfd_vma) 1)); |
| 3601 | |
| 3602 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 3603 | symbol is defined locally or was forced to be local because |
| 3604 | of a version file, we just want to emit a RELATIVE reloc. |
| 3605 | The entry in the global offset table will already have been |
| 3606 | initialized in the relocate_section function. */ |
| 3607 | if (info->shared |
| 3608 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 3609 | { |
| 3610 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 3611 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 3612 | } |
| 3613 | else |
| 3614 | { |
| 3615 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 3616 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
| 3617 | htab->sgot->contents + h->got.offset); |
| 3618 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); |
| 3619 | } |
| 3620 | |
| 3621 | loc = htab->srelgot->contents; |
| 3622 | loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3623 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3624 | } |
| 3625 | |
| 3626 | if (h->needs_copy) |
| 3627 | { |
| 3628 | Elf_Internal_Rela rel; |
| 3629 | bfd_byte *loc; |
| 3630 | |
| 3631 | /* This symbol needs a copy reloc. Set it up. */ |
| 3632 | |
| 3633 | if (h->dynindx == -1 |
| 3634 | || (h->root.type != bfd_link_hash_defined |
| 3635 | && h->root.type != bfd_link_hash_defweak) |
| 3636 | || htab->srelbss == NULL) |
| 3637 | abort (); |
| 3638 | |
| 3639 | rel.r_offset = (h->root.u.def.value |
| 3640 | + h->root.u.def.section->output_section->vma |
| 3641 | + h->root.u.def.section->output_offset); |
| 3642 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); |
| 3643 | loc = htab->srelbss->contents; |
| 3644 | loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3645 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3646 | } |
| 3647 | |
| 3648 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. |
| 3649 | On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it |
| 3650 | is relative to the ".got" section. */ |
| 3651 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 3652 | || (strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0 |
| 3653 | && !htab->is_vxworks)) |
| 3654 | sym->st_shndx = SHN_ABS; |
| 3655 | |
| 3656 | return TRUE; |
| 3657 | } |
| 3658 | |
| 3659 | /* Used to decide how to sort relocs in an optimal manner for the |
| 3660 | dynamic linker, before writing them out. */ |
| 3661 | |
| 3662 | static enum elf_reloc_type_class |
| 3663 | elf_i386_reloc_type_class (const Elf_Internal_Rela *rela) |
| 3664 | { |
| 3665 | switch (ELF32_R_TYPE (rela->r_info)) |
| 3666 | { |
| 3667 | case R_386_RELATIVE: |
| 3668 | return reloc_class_relative; |
| 3669 | case R_386_JUMP_SLOT: |
| 3670 | return reloc_class_plt; |
| 3671 | case R_386_COPY: |
| 3672 | return reloc_class_copy; |
| 3673 | default: |
| 3674 | return reloc_class_normal; |
| 3675 | } |
| 3676 | } |
| 3677 | |
| 3678 | /* Finish up the dynamic sections. */ |
| 3679 | |
| 3680 | static bfd_boolean |
| 3681 | elf_i386_finish_dynamic_sections (bfd *output_bfd, |
| 3682 | struct bfd_link_info *info) |
| 3683 | { |
| 3684 | struct elf_i386_link_hash_table *htab; |
| 3685 | bfd *dynobj; |
| 3686 | asection *sdyn; |
| 3687 | |
| 3688 | htab = elf_i386_hash_table (info); |
| 3689 | dynobj = htab->elf.dynobj; |
| 3690 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 3691 | |
| 3692 | if (htab->elf.dynamic_sections_created) |
| 3693 | { |
| 3694 | Elf32_External_Dyn *dyncon, *dynconend; |
| 3695 | |
| 3696 | if (sdyn == NULL || htab->sgot == NULL) |
| 3697 | abort (); |
| 3698 | |
| 3699 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 3700 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); |
| 3701 | for (; dyncon < dynconend; dyncon++) |
| 3702 | { |
| 3703 | Elf_Internal_Dyn dyn; |
| 3704 | asection *s; |
| 3705 | |
| 3706 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 3707 | |
| 3708 | switch (dyn.d_tag) |
| 3709 | { |
| 3710 | default: |
| 3711 | continue; |
| 3712 | |
| 3713 | case DT_PLTGOT: |
| 3714 | s = htab->sgotplt; |
| 3715 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 3716 | break; |
| 3717 | |
| 3718 | case DT_JMPREL: |
| 3719 | s = htab->srelplt; |
| 3720 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 3721 | break; |
| 3722 | |
| 3723 | case DT_PLTRELSZ: |
| 3724 | s = htab->srelplt; |
| 3725 | dyn.d_un.d_val = s->size; |
| 3726 | break; |
| 3727 | |
| 3728 | case DT_RELSZ: |
| 3729 | /* My reading of the SVR4 ABI indicates that the |
| 3730 | procedure linkage table relocs (DT_JMPREL) should be |
| 3731 | included in the overall relocs (DT_REL). This is |
| 3732 | what Solaris does. However, UnixWare can not handle |
| 3733 | that case. Therefore, we override the DT_RELSZ entry |
| 3734 | here to make it not include the JMPREL relocs. */ |
| 3735 | s = htab->srelplt; |
| 3736 | if (s == NULL) |
| 3737 | continue; |
| 3738 | dyn.d_un.d_val -= s->size; |
| 3739 | break; |
| 3740 | |
| 3741 | case DT_REL: |
| 3742 | /* We may not be using the standard ELF linker script. |
| 3743 | If .rel.plt is the first .rel section, we adjust |
| 3744 | DT_REL to not include it. */ |
| 3745 | s = htab->srelplt; |
| 3746 | if (s == NULL) |
| 3747 | continue; |
| 3748 | if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) |
| 3749 | continue; |
| 3750 | dyn.d_un.d_ptr += s->size; |
| 3751 | break; |
| 3752 | } |
| 3753 | |
| 3754 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 3755 | } |
| 3756 | |
| 3757 | /* Fill in the first entry in the procedure linkage table. */ |
| 3758 | if (htab->splt && htab->splt->size > 0) |
| 3759 | { |
| 3760 | if (info->shared) |
| 3761 | { |
| 3762 | memcpy (htab->splt->contents, elf_i386_pic_plt0_entry, |
| 3763 | sizeof (elf_i386_pic_plt0_entry)); |
| 3764 | memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry), |
| 3765 | htab->plt0_pad_byte, |
| 3766 | PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry)); |
| 3767 | } |
| 3768 | else |
| 3769 | { |
| 3770 | memcpy (htab->splt->contents, elf_i386_plt0_entry, |
| 3771 | sizeof(elf_i386_plt0_entry)); |
| 3772 | memset (htab->splt->contents + sizeof (elf_i386_plt0_entry), |
| 3773 | htab->plt0_pad_byte, |
| 3774 | PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry)); |
| 3775 | bfd_put_32 (output_bfd, |
| 3776 | (htab->sgotplt->output_section->vma |
| 3777 | + htab->sgotplt->output_offset |
| 3778 | + 4), |
| 3779 | htab->splt->contents + 2); |
| 3780 | bfd_put_32 (output_bfd, |
| 3781 | (htab->sgotplt->output_section->vma |
| 3782 | + htab->sgotplt->output_offset |
| 3783 | + 8), |
| 3784 | htab->splt->contents + 8); |
| 3785 | |
| 3786 | if (htab->is_vxworks) |
| 3787 | { |
| 3788 | Elf_Internal_Rela rel; |
| 3789 | struct elf_link_hash_entry *hgot; |
| 3790 | |
| 3791 | /* The VxWorks GOT is relocated by the dynamic linker. |
| 3792 | Therefore, we must emit relocations rather than |
| 3793 | simply computing the values now. */ |
| 3794 | hgot = elf_link_hash_lookup (elf_hash_table (info), |
| 3795 | "_GLOBAL_OFFSET_TABLE_", |
| 3796 | FALSE, FALSE, FALSE); |
| 3797 | /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4. |
| 3798 | On IA32 we use REL relocations so the addend goes in |
| 3799 | the PLT directly. */ |
| 3800 | rel.r_offset = (htab->splt->output_section->vma |
| 3801 | + htab->splt->output_offset |
| 3802 | + 2); |
| 3803 | rel.r_info = ELF32_R_INFO (hgot->indx, R_386_32); |
| 3804 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 3805 | htab->srelplt2->contents); |
| 3806 | /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ |
| 3807 | rel.r_offset = (htab->splt->output_section->vma |
| 3808 | + htab->splt->output_offset |
| 3809 | + 8); |
| 3810 | rel.r_info = ELF32_R_INFO (hgot->indx, R_386_32); |
| 3811 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 3812 | htab->srelplt2->contents + |
| 3813 | sizeof (Elf32_External_Rel)); |
| 3814 | } |
| 3815 | } |
| 3816 | |
| 3817 | /* UnixWare sets the entsize of .plt to 4, although that doesn't |
| 3818 | really seem like the right value. */ |
| 3819 | elf_section_data (htab->splt->output_section) |
| 3820 | ->this_hdr.sh_entsize = 4; |
| 3821 | |
| 3822 | /* Correct the .rel.plt.unloaded relocations. */ |
| 3823 | if (htab->is_vxworks && !info->shared) |
| 3824 | { |
| 3825 | int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1; |
| 3826 | unsigned char *p; |
| 3827 | |
| 3828 | p = htab->srelplt2->contents; |
| 3829 | if (info->shared) |
| 3830 | p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel); |
| 3831 | else |
| 3832 | p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel); |
| 3833 | |
| 3834 | for (; num_plts; num_plts--) |
| 3835 | { |
| 3836 | Elf_Internal_Rela rel; |
| 3837 | bfd_elf32_swap_reloc_in (output_bfd, p, &rel); |
| 3838 | rel.r_info = ELF32_R_INFO (htab->hgot->indx, R_386_32); |
| 3839 | bfd_elf32_swap_reloc_out (output_bfd, &rel, p); |
| 3840 | p += sizeof (Elf32_External_Rel); |
| 3841 | |
| 3842 | bfd_elf32_swap_reloc_in (output_bfd, p, &rel); |
| 3843 | rel.r_info = ELF32_R_INFO (htab->hplt->indx, R_386_32); |
| 3844 | bfd_elf32_swap_reloc_out (output_bfd, &rel, p); |
| 3845 | p += sizeof (Elf32_External_Rel); |
| 3846 | } |
| 3847 | } |
| 3848 | } |
| 3849 | } |
| 3850 | |
| 3851 | if (htab->sgotplt) |
| 3852 | { |
| 3853 | /* Fill in the first three entries in the global offset table. */ |
| 3854 | if (htab->sgotplt->size > 0) |
| 3855 | { |
| 3856 | bfd_put_32 (output_bfd, |
| 3857 | (sdyn == NULL ? 0 |
| 3858 | : sdyn->output_section->vma + sdyn->output_offset), |
| 3859 | htab->sgotplt->contents); |
| 3860 | bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4); |
| 3861 | bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8); |
| 3862 | } |
| 3863 | |
| 3864 | elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4; |
| 3865 | } |
| 3866 | |
| 3867 | if (htab->sgot && htab->sgot->size > 0) |
| 3868 | elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4; |
| 3869 | |
| 3870 | return TRUE; |
| 3871 | } |
| 3872 | |
| 3873 | /* Return address for Ith PLT stub in section PLT, for relocation REL |
| 3874 | or (bfd_vma) -1 if it should not be included. */ |
| 3875 | |
| 3876 | static bfd_vma |
| 3877 | elf_i386_plt_sym_val (bfd_vma i, const asection *plt, |
| 3878 | const arelent *rel ATTRIBUTE_UNUSED) |
| 3879 | { |
| 3880 | return plt->vma + (i + 1) * PLT_ENTRY_SIZE; |
| 3881 | } |
| 3882 | |
| 3883 | |
| 3884 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec |
| 3885 | #define TARGET_LITTLE_NAME "elf32-i386" |
| 3886 | #define ELF_ARCH bfd_arch_i386 |
| 3887 | #define ELF_MACHINE_CODE EM_386 |
| 3888 | #define ELF_MAXPAGESIZE 0x1000 |
| 3889 | |
| 3890 | #define elf_backend_can_gc_sections 1 |
| 3891 | #define elf_backend_can_refcount 1 |
| 3892 | #define elf_backend_want_got_plt 1 |
| 3893 | #define elf_backend_plt_readonly 1 |
| 3894 | #define elf_backend_want_plt_sym 0 |
| 3895 | #define elf_backend_got_header_size 12 |
| 3896 | |
| 3897 | /* Support RELA for objdump of prelink objects. */ |
| 3898 | #define elf_info_to_howto elf_i386_info_to_howto_rel |
| 3899 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel |
| 3900 | |
| 3901 | #define bfd_elf32_mkobject elf_i386_mkobject |
| 3902 | |
| 3903 | #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name |
| 3904 | #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create |
| 3905 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup |
| 3906 | |
| 3907 | #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol |
| 3908 | #define elf_backend_check_relocs elf_i386_check_relocs |
| 3909 | #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol |
| 3910 | #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections |
| 3911 | #define elf_backend_fake_sections elf_i386_fake_sections |
| 3912 | #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections |
| 3913 | #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol |
| 3914 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook |
| 3915 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook |
| 3916 | #define elf_backend_grok_prstatus elf_i386_grok_prstatus |
| 3917 | #define elf_backend_grok_psinfo elf_i386_grok_psinfo |
| 3918 | #define elf_backend_reloc_type_class elf_i386_reloc_type_class |
| 3919 | #define elf_backend_relocate_section elf_i386_relocate_section |
| 3920 | #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections |
| 3921 | #define elf_backend_always_size_sections elf_i386_always_size_sections |
| 3922 | #define elf_backend_plt_sym_val elf_i386_plt_sym_val |
| 3923 | |
| 3924 | #include "elf32-target.h" |
| 3925 | |
| 3926 | /* FreeBSD support. */ |
| 3927 | |
| 3928 | #undef TARGET_LITTLE_SYM |
| 3929 | #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec |
| 3930 | #undef TARGET_LITTLE_NAME |
| 3931 | #define TARGET_LITTLE_NAME "elf32-i386-freebsd" |
| 3932 | |
| 3933 | /* The kernel recognizes executables as valid only if they carry a |
| 3934 | "FreeBSD" label in the ELF header. So we put this label on all |
| 3935 | executables and (for simplicity) also all other object files. */ |
| 3936 | |
| 3937 | static void |
| 3938 | elf_i386_post_process_headers (bfd *abfd, |
| 3939 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 3940 | { |
| 3941 | Elf_Internal_Ehdr *i_ehdrp; |
| 3942 | |
| 3943 | i_ehdrp = elf_elfheader (abfd); |
| 3944 | |
| 3945 | /* Put an ABI label supported by FreeBSD >= 4.1. */ |
| 3946 | i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; |
| 3947 | #ifdef OLD_FREEBSD_ABI_LABEL |
| 3948 | /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ |
| 3949 | memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); |
| 3950 | #endif |
| 3951 | } |
| 3952 | |
| 3953 | #undef elf_backend_post_process_headers |
| 3954 | #define elf_backend_post_process_headers elf_i386_post_process_headers |
| 3955 | #undef elf32_bed |
| 3956 | #define elf32_bed elf32_i386_fbsd_bed |
| 3957 | |
| 3958 | #include "elf32-target.h" |
| 3959 | |
| 3960 | /* VxWorks support. */ |
| 3961 | |
| 3962 | #undef TARGET_LITTLE_SYM |
| 3963 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec |
| 3964 | #undef TARGET_LITTLE_NAME |
| 3965 | #define TARGET_LITTLE_NAME "elf32-i386-vxworks" |
| 3966 | |
| 3967 | |
| 3968 | /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */ |
| 3969 | |
| 3970 | static struct bfd_link_hash_table * |
| 3971 | elf_i386_vxworks_link_hash_table_create (bfd *abfd) |
| 3972 | { |
| 3973 | struct bfd_link_hash_table *ret; |
| 3974 | struct elf_i386_link_hash_table *htab; |
| 3975 | |
| 3976 | ret = elf_i386_link_hash_table_create (abfd); |
| 3977 | if (ret) |
| 3978 | { |
| 3979 | htab = (struct elf_i386_link_hash_table *) ret; |
| 3980 | htab->is_vxworks = 1; |
| 3981 | htab->plt0_pad_byte = 0x90; |
| 3982 | } |
| 3983 | |
| 3984 | return ret; |
| 3985 | } |
| 3986 | |
| 3987 | |
| 3988 | /* Tweak magic VxWorks symbols as they are written to the output file. */ |
| 3989 | static bfd_boolean |
| 3990 | elf_i386_vxworks_link_output_symbol_hook (struct bfd_link_info *info |
| 3991 | ATTRIBUTE_UNUSED, |
| 3992 | const char *name, |
| 3993 | Elf_Internal_Sym *sym, |
| 3994 | asection *input_sec ATTRIBUTE_UNUSED, |
| 3995 | struct elf_link_hash_entry *h |
| 3996 | ATTRIBUTE_UNUSED) |
| 3997 | { |
| 3998 | /* Ignore the first dummy symbol. */ |
| 3999 | if (!name) |
| 4000 | return TRUE; |
| 4001 | |
| 4002 | return elf_vxworks_link_output_symbol_hook (name, sym); |
| 4003 | } |
| 4004 | |
| 4005 | #undef elf_backend_post_process_headers |
| 4006 | #undef bfd_elf32_bfd_link_hash_table_create |
| 4007 | #define bfd_elf32_bfd_link_hash_table_create \ |
| 4008 | elf_i386_vxworks_link_hash_table_create |
| 4009 | #undef elf_backend_add_symbol_hook |
| 4010 | #define elf_backend_add_symbol_hook \ |
| 4011 | elf_vxworks_add_symbol_hook |
| 4012 | #undef elf_backend_link_output_symbol_hook |
| 4013 | #define elf_backend_link_output_symbol_hook \ |
| 4014 | elf_i386_vxworks_link_output_symbol_hook |
| 4015 | #undef elf_backend_emit_relocs |
| 4016 | #define elf_backend_emit_relocs elf_vxworks_emit_relocs |
| 4017 | #undef elf_backend_final_write_processing |
| 4018 | #define elf_backend_final_write_processing \ |
| 4019 | elf_vxworks_final_write_processing |
| 4020 | |
| 4021 | /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so |
| 4022 | define it. */ |
| 4023 | #undef elf_backend_want_plt_sym |
| 4024 | #define elf_backend_want_plt_sym 1 |
| 4025 | |
| 4026 | #undef elf32_bed |
| 4027 | #define elf32_bed elf32_i386_vxworks_bed |
| 4028 | |
| 4029 | #include "elf32-target.h" |