| 1 | /* Intel 80386/80486-specific support for 32-bit ELF |
| 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, |
| 3 | 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 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, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "bfdlink.h" |
| 25 | #include "libbfd.h" |
| 26 | #include "elf-bfd.h" |
| 27 | #include "elf-vxworks.h" |
| 28 | #include "bfd_stdint.h" |
| 29 | |
| 30 | /* 386 uses REL relocations instead of RELA. */ |
| 31 | #define USE_REL 1 |
| 32 | |
| 33 | #include "elf/i386.h" |
| 34 | |
| 35 | static reloc_howto_type elf_howto_table[]= |
| 36 | { |
| 37 | HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield, |
| 38 | bfd_elf_generic_reloc, "R_386_NONE", |
| 39 | TRUE, 0x00000000, 0x00000000, FALSE), |
| 40 | HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 41 | bfd_elf_generic_reloc, "R_386_32", |
| 42 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 43 | HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 44 | bfd_elf_generic_reloc, "R_386_PC32", |
| 45 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 46 | HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 47 | bfd_elf_generic_reloc, "R_386_GOT32", |
| 48 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 49 | HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 50 | bfd_elf_generic_reloc, "R_386_PLT32", |
| 51 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 52 | HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 53 | bfd_elf_generic_reloc, "R_386_COPY", |
| 54 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 55 | HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 56 | bfd_elf_generic_reloc, "R_386_GLOB_DAT", |
| 57 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 58 | HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 59 | bfd_elf_generic_reloc, "R_386_JUMP_SLOT", |
| 60 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 61 | HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 62 | bfd_elf_generic_reloc, "R_386_RELATIVE", |
| 63 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 64 | HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 65 | bfd_elf_generic_reloc, "R_386_GOTOFF", |
| 66 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 67 | HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 68 | bfd_elf_generic_reloc, "R_386_GOTPC", |
| 69 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 70 | |
| 71 | /* We have a gap in the reloc numbers here. |
| 72 | R_386_standard counts the number up to this point, and |
| 73 | R_386_ext_offset is the value to subtract from a reloc type of |
| 74 | R_386_16 thru R_386_PC8 to form an index into this table. */ |
| 75 | #define R_386_standard (R_386_GOTPC + 1) |
| 76 | #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard) |
| 77 | |
| 78 | /* These relocs are a GNU extension. */ |
| 79 | HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 80 | bfd_elf_generic_reloc, "R_386_TLS_TPOFF", |
| 81 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 82 | HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 83 | bfd_elf_generic_reloc, "R_386_TLS_IE", |
| 84 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 85 | HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 86 | bfd_elf_generic_reloc, "R_386_TLS_GOTIE", |
| 87 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 88 | HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 89 | bfd_elf_generic_reloc, "R_386_TLS_LE", |
| 90 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 91 | HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 92 | bfd_elf_generic_reloc, "R_386_TLS_GD", |
| 93 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 94 | HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 95 | bfd_elf_generic_reloc, "R_386_TLS_LDM", |
| 96 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 97 | HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, |
| 98 | bfd_elf_generic_reloc, "R_386_16", |
| 99 | TRUE, 0xffff, 0xffff, FALSE), |
| 100 | HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, |
| 101 | bfd_elf_generic_reloc, "R_386_PC16", |
| 102 | TRUE, 0xffff, 0xffff, TRUE), |
| 103 | HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, |
| 104 | bfd_elf_generic_reloc, "R_386_8", |
| 105 | TRUE, 0xff, 0xff, FALSE), |
| 106 | HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, |
| 107 | bfd_elf_generic_reloc, "R_386_PC8", |
| 108 | TRUE, 0xff, 0xff, TRUE), |
| 109 | |
| 110 | #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset) |
| 111 | #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext) |
| 112 | /* These are common with Solaris TLS implementation. */ |
| 113 | HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 114 | bfd_elf_generic_reloc, "R_386_TLS_LDO_32", |
| 115 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 116 | HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 117 | bfd_elf_generic_reloc, "R_386_TLS_IE_32", |
| 118 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 119 | HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 120 | bfd_elf_generic_reloc, "R_386_TLS_LE_32", |
| 121 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 122 | HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 123 | bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32", |
| 124 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 125 | HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 126 | bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32", |
| 127 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 128 | HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 129 | bfd_elf_generic_reloc, "R_386_TLS_TPOFF32", |
| 130 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 131 | EMPTY_HOWTO (38), |
| 132 | HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 133 | bfd_elf_generic_reloc, "R_386_TLS_GOTDESC", |
| 134 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 135 | HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, |
| 136 | bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL", |
| 137 | FALSE, 0, 0, FALSE), |
| 138 | HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 139 | bfd_elf_generic_reloc, "R_386_TLS_DESC", |
| 140 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 141 | |
| 142 | /* Another gap. */ |
| 143 | #define R_386_tls (R_386_TLS_DESC + 1 - R_386_tls_offset) |
| 144 | #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls) |
| 145 | |
| 146 | /* GNU extension to record C++ vtable hierarchy. */ |
| 147 | HOWTO (R_386_GNU_VTINHERIT, /* type */ |
| 148 | 0, /* rightshift */ |
| 149 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 150 | 0, /* bitsize */ |
| 151 | FALSE, /* pc_relative */ |
| 152 | 0, /* bitpos */ |
| 153 | complain_overflow_dont, /* complain_on_overflow */ |
| 154 | NULL, /* special_function */ |
| 155 | "R_386_GNU_VTINHERIT", /* name */ |
| 156 | FALSE, /* partial_inplace */ |
| 157 | 0, /* src_mask */ |
| 158 | 0, /* dst_mask */ |
| 159 | FALSE), /* pcrel_offset */ |
| 160 | |
| 161 | /* GNU extension to record C++ vtable member usage. */ |
| 162 | HOWTO (R_386_GNU_VTENTRY, /* type */ |
| 163 | 0, /* rightshift */ |
| 164 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 165 | 0, /* bitsize */ |
| 166 | FALSE, /* pc_relative */ |
| 167 | 0, /* bitpos */ |
| 168 | complain_overflow_dont, /* complain_on_overflow */ |
| 169 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 170 | "R_386_GNU_VTENTRY", /* name */ |
| 171 | FALSE, /* partial_inplace */ |
| 172 | 0, /* src_mask */ |
| 173 | 0, /* dst_mask */ |
| 174 | FALSE) /* pcrel_offset */ |
| 175 | |
| 176 | #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset) |
| 177 | |
| 178 | }; |
| 179 | |
| 180 | #ifdef DEBUG_GEN_RELOC |
| 181 | #define TRACE(str) \ |
| 182 | fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) |
| 183 | #else |
| 184 | #define TRACE(str) |
| 185 | #endif |
| 186 | |
| 187 | static reloc_howto_type * |
| 188 | elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 189 | bfd_reloc_code_real_type code) |
| 190 | { |
| 191 | switch (code) |
| 192 | { |
| 193 | case BFD_RELOC_NONE: |
| 194 | TRACE ("BFD_RELOC_NONE"); |
| 195 | return &elf_howto_table[R_386_NONE]; |
| 196 | |
| 197 | case BFD_RELOC_32: |
| 198 | TRACE ("BFD_RELOC_32"); |
| 199 | return &elf_howto_table[R_386_32]; |
| 200 | |
| 201 | case BFD_RELOC_CTOR: |
| 202 | TRACE ("BFD_RELOC_CTOR"); |
| 203 | return &elf_howto_table[R_386_32]; |
| 204 | |
| 205 | case BFD_RELOC_32_PCREL: |
| 206 | TRACE ("BFD_RELOC_PC32"); |
| 207 | return &elf_howto_table[R_386_PC32]; |
| 208 | |
| 209 | case BFD_RELOC_386_GOT32: |
| 210 | TRACE ("BFD_RELOC_386_GOT32"); |
| 211 | return &elf_howto_table[R_386_GOT32]; |
| 212 | |
| 213 | case BFD_RELOC_386_PLT32: |
| 214 | TRACE ("BFD_RELOC_386_PLT32"); |
| 215 | return &elf_howto_table[R_386_PLT32]; |
| 216 | |
| 217 | case BFD_RELOC_386_COPY: |
| 218 | TRACE ("BFD_RELOC_386_COPY"); |
| 219 | return &elf_howto_table[R_386_COPY]; |
| 220 | |
| 221 | case BFD_RELOC_386_GLOB_DAT: |
| 222 | TRACE ("BFD_RELOC_386_GLOB_DAT"); |
| 223 | return &elf_howto_table[R_386_GLOB_DAT]; |
| 224 | |
| 225 | case BFD_RELOC_386_JUMP_SLOT: |
| 226 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); |
| 227 | return &elf_howto_table[R_386_JUMP_SLOT]; |
| 228 | |
| 229 | case BFD_RELOC_386_RELATIVE: |
| 230 | TRACE ("BFD_RELOC_386_RELATIVE"); |
| 231 | return &elf_howto_table[R_386_RELATIVE]; |
| 232 | |
| 233 | case BFD_RELOC_386_GOTOFF: |
| 234 | TRACE ("BFD_RELOC_386_GOTOFF"); |
| 235 | return &elf_howto_table[R_386_GOTOFF]; |
| 236 | |
| 237 | case BFD_RELOC_386_GOTPC: |
| 238 | TRACE ("BFD_RELOC_386_GOTPC"); |
| 239 | return &elf_howto_table[R_386_GOTPC]; |
| 240 | |
| 241 | /* These relocs are a GNU extension. */ |
| 242 | case BFD_RELOC_386_TLS_TPOFF: |
| 243 | TRACE ("BFD_RELOC_386_TLS_TPOFF"); |
| 244 | return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset]; |
| 245 | |
| 246 | case BFD_RELOC_386_TLS_IE: |
| 247 | TRACE ("BFD_RELOC_386_TLS_IE"); |
| 248 | return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset]; |
| 249 | |
| 250 | case BFD_RELOC_386_TLS_GOTIE: |
| 251 | TRACE ("BFD_RELOC_386_TLS_GOTIE"); |
| 252 | return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset]; |
| 253 | |
| 254 | case BFD_RELOC_386_TLS_LE: |
| 255 | TRACE ("BFD_RELOC_386_TLS_LE"); |
| 256 | return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset]; |
| 257 | |
| 258 | case BFD_RELOC_386_TLS_GD: |
| 259 | TRACE ("BFD_RELOC_386_TLS_GD"); |
| 260 | return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset]; |
| 261 | |
| 262 | case BFD_RELOC_386_TLS_LDM: |
| 263 | TRACE ("BFD_RELOC_386_TLS_LDM"); |
| 264 | return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset]; |
| 265 | |
| 266 | case BFD_RELOC_16: |
| 267 | TRACE ("BFD_RELOC_16"); |
| 268 | return &elf_howto_table[R_386_16 - R_386_ext_offset]; |
| 269 | |
| 270 | case BFD_RELOC_16_PCREL: |
| 271 | TRACE ("BFD_RELOC_16_PCREL"); |
| 272 | return &elf_howto_table[R_386_PC16 - R_386_ext_offset]; |
| 273 | |
| 274 | case BFD_RELOC_8: |
| 275 | TRACE ("BFD_RELOC_8"); |
| 276 | return &elf_howto_table[R_386_8 - R_386_ext_offset]; |
| 277 | |
| 278 | case BFD_RELOC_8_PCREL: |
| 279 | TRACE ("BFD_RELOC_8_PCREL"); |
| 280 | return &elf_howto_table[R_386_PC8 - R_386_ext_offset]; |
| 281 | |
| 282 | /* Common with Sun TLS implementation. */ |
| 283 | case BFD_RELOC_386_TLS_LDO_32: |
| 284 | TRACE ("BFD_RELOC_386_TLS_LDO_32"); |
| 285 | return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset]; |
| 286 | |
| 287 | case BFD_RELOC_386_TLS_IE_32: |
| 288 | TRACE ("BFD_RELOC_386_TLS_IE_32"); |
| 289 | return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset]; |
| 290 | |
| 291 | case BFD_RELOC_386_TLS_LE_32: |
| 292 | TRACE ("BFD_RELOC_386_TLS_LE_32"); |
| 293 | return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset]; |
| 294 | |
| 295 | case BFD_RELOC_386_TLS_DTPMOD32: |
| 296 | TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); |
| 297 | return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset]; |
| 298 | |
| 299 | case BFD_RELOC_386_TLS_DTPOFF32: |
| 300 | TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); |
| 301 | return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset]; |
| 302 | |
| 303 | case BFD_RELOC_386_TLS_TPOFF32: |
| 304 | TRACE ("BFD_RELOC_386_TLS_TPOFF32"); |
| 305 | return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset]; |
| 306 | |
| 307 | case BFD_RELOC_386_TLS_GOTDESC: |
| 308 | TRACE ("BFD_RELOC_386_TLS_GOTDESC"); |
| 309 | return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset]; |
| 310 | |
| 311 | case BFD_RELOC_386_TLS_DESC_CALL: |
| 312 | TRACE ("BFD_RELOC_386_TLS_DESC_CALL"); |
| 313 | return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset]; |
| 314 | |
| 315 | case BFD_RELOC_386_TLS_DESC: |
| 316 | TRACE ("BFD_RELOC_386_TLS_DESC"); |
| 317 | return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset]; |
| 318 | |
| 319 | case BFD_RELOC_VTABLE_INHERIT: |
| 320 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); |
| 321 | return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset]; |
| 322 | |
| 323 | case BFD_RELOC_VTABLE_ENTRY: |
| 324 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); |
| 325 | return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset]; |
| 326 | |
| 327 | default: |
| 328 | break; |
| 329 | } |
| 330 | |
| 331 | TRACE ("Unknown"); |
| 332 | return 0; |
| 333 | } |
| 334 | |
| 335 | static reloc_howto_type * |
| 336 | elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 337 | const char *r_name) |
| 338 | { |
| 339 | unsigned int i; |
| 340 | |
| 341 | for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) |
| 342 | if (elf_howto_table[i].name != NULL |
| 343 | && strcasecmp (elf_howto_table[i].name, r_name) == 0) |
| 344 | return &elf_howto_table[i]; |
| 345 | |
| 346 | return NULL; |
| 347 | } |
| 348 | |
| 349 | static reloc_howto_type * |
| 350 | elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type) |
| 351 | { |
| 352 | unsigned int indx; |
| 353 | |
| 354 | if ((indx = r_type) >= R_386_standard |
| 355 | && ((indx = r_type - R_386_ext_offset) - R_386_standard |
| 356 | >= R_386_ext - R_386_standard) |
| 357 | && ((indx = r_type - R_386_tls_offset) - R_386_ext |
| 358 | >= R_386_tls - R_386_ext) |
| 359 | && ((indx = r_type - R_386_vt_offset) - R_386_tls |
| 360 | >= R_386_vt - R_386_tls)) |
| 361 | { |
| 362 | (*_bfd_error_handler) (_("%B: invalid relocation type %d"), |
| 363 | abfd, (int) r_type); |
| 364 | indx = R_386_NONE; |
| 365 | } |
| 366 | BFD_ASSERT (elf_howto_table [indx].type == r_type); |
| 367 | return &elf_howto_table[indx]; |
| 368 | } |
| 369 | |
| 370 | static void |
| 371 | elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, |
| 372 | arelent *cache_ptr, |
| 373 | Elf_Internal_Rela *dst) |
| 374 | { |
| 375 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
| 376 | cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type); |
| 377 | } |
| 378 | |
| 379 | /* Return whether a symbol name implies a local label. The UnixWare |
| 380 | 2.1 cc generates temporary symbols that start with .X, so we |
| 381 | recognize them here. FIXME: do other SVR4 compilers also use .X?. |
| 382 | If so, we should move the .X recognition into |
| 383 | _bfd_elf_is_local_label_name. */ |
| 384 | |
| 385 | static bfd_boolean |
| 386 | elf_i386_is_local_label_name (bfd *abfd, const char *name) |
| 387 | { |
| 388 | if (name[0] == '.' && name[1] == 'X') |
| 389 | return TRUE; |
| 390 | |
| 391 | return _bfd_elf_is_local_label_name (abfd, name); |
| 392 | } |
| 393 | \f |
| 394 | /* Support for core dump NOTE sections. */ |
| 395 | |
| 396 | static bfd_boolean |
| 397 | elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 398 | { |
| 399 | int offset; |
| 400 | size_t size; |
| 401 | |
| 402 | if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) |
| 403 | { |
| 404 | int pr_version = bfd_get_32 (abfd, note->descdata); |
| 405 | |
| 406 | if (pr_version != 1) |
| 407 | return FALSE; |
| 408 | |
| 409 | /* pr_cursig */ |
| 410 | elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20); |
| 411 | |
| 412 | /* pr_pid */ |
| 413 | elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); |
| 414 | |
| 415 | /* pr_reg */ |
| 416 | offset = 28; |
| 417 | size = bfd_get_32 (abfd, note->descdata + 8); |
| 418 | } |
| 419 | else |
| 420 | { |
| 421 | switch (note->descsz) |
| 422 | { |
| 423 | default: |
| 424 | return FALSE; |
| 425 | |
| 426 | case 144: /* Linux/i386 */ |
| 427 | /* pr_cursig */ |
| 428 | elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); |
| 429 | |
| 430 | /* pr_pid */ |
| 431 | elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); |
| 432 | |
| 433 | /* pr_reg */ |
| 434 | offset = 72; |
| 435 | size = 68; |
| 436 | |
| 437 | break; |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | /* Make a ".reg/999" section. */ |
| 442 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 443 | size, note->descpos + offset); |
| 444 | } |
| 445 | |
| 446 | static bfd_boolean |
| 447 | elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 448 | { |
| 449 | if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) |
| 450 | { |
| 451 | int pr_version = bfd_get_32 (abfd, note->descdata); |
| 452 | |
| 453 | if (pr_version != 1) |
| 454 | return FALSE; |
| 455 | |
| 456 | elf_tdata (abfd)->core_program |
| 457 | = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); |
| 458 | elf_tdata (abfd)->core_command |
| 459 | = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); |
| 460 | } |
| 461 | else |
| 462 | { |
| 463 | switch (note->descsz) |
| 464 | { |
| 465 | default: |
| 466 | return FALSE; |
| 467 | |
| 468 | case 124: /* Linux/i386 elf_prpsinfo. */ |
| 469 | elf_tdata (abfd)->core_program |
| 470 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); |
| 471 | elf_tdata (abfd)->core_command |
| 472 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | /* Note that for some reason, a spurious space is tacked |
| 477 | onto the end of the args in some (at least one anyway) |
| 478 | implementations, so strip it off if it exists. */ |
| 479 | { |
| 480 | char *command = elf_tdata (abfd)->core_command; |
| 481 | int n = strlen (command); |
| 482 | |
| 483 | if (0 < n && command[n - 1] == ' ') |
| 484 | command[n - 1] = '\0'; |
| 485 | } |
| 486 | |
| 487 | return TRUE; |
| 488 | } |
| 489 | \f |
| 490 | /* Functions for the i386 ELF linker. |
| 491 | |
| 492 | In order to gain some understanding of code in this file without |
| 493 | knowing all the intricate details of the linker, note the |
| 494 | following: |
| 495 | |
| 496 | Functions named elf_i386_* are called by external routines, other |
| 497 | functions are only called locally. elf_i386_* functions appear |
| 498 | in this file more or less in the order in which they are called |
| 499 | from external routines. eg. elf_i386_check_relocs is called |
| 500 | early in the link process, elf_i386_finish_dynamic_sections is |
| 501 | one of the last functions. */ |
| 502 | |
| 503 | |
| 504 | /* The name of the dynamic interpreter. This is put in the .interp |
| 505 | section. */ |
| 506 | |
| 507 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" |
| 508 | |
| 509 | /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid |
| 510 | copying dynamic variables from a shared lib into an app's dynbss |
| 511 | section, and instead use a dynamic relocation to point into the |
| 512 | shared lib. */ |
| 513 | #define ELIMINATE_COPY_RELOCS 1 |
| 514 | |
| 515 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 516 | |
| 517 | #define PLT_ENTRY_SIZE 16 |
| 518 | |
| 519 | /* The first entry in an absolute procedure linkage table looks like |
| 520 | this. See the SVR4 ABI i386 supplement to see how this works. |
| 521 | Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ |
| 522 | |
| 523 | static const bfd_byte elf_i386_plt0_entry[12] = |
| 524 | { |
| 525 | 0xff, 0x35, /* pushl contents of address */ |
| 526 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ |
| 527 | 0xff, 0x25, /* jmp indirect */ |
| 528 | 0, 0, 0, 0 /* replaced with address of .got + 8. */ |
| 529 | }; |
| 530 | |
| 531 | /* Subsequent entries in an absolute procedure linkage table look like |
| 532 | this. */ |
| 533 | |
| 534 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = |
| 535 | { |
| 536 | 0xff, 0x25, /* jmp indirect */ |
| 537 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ |
| 538 | 0x68, /* pushl immediate */ |
| 539 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 540 | 0xe9, /* jmp relative */ |
| 541 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 542 | }; |
| 543 | |
| 544 | /* The first entry in a PIC procedure linkage table look like this. |
| 545 | Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ |
| 546 | |
| 547 | static const bfd_byte elf_i386_pic_plt0_entry[12] = |
| 548 | { |
| 549 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ |
| 550 | 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */ |
| 551 | }; |
| 552 | |
| 553 | /* Subsequent entries in a PIC procedure linkage table look like this. */ |
| 554 | |
| 555 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = |
| 556 | { |
| 557 | 0xff, 0xa3, /* jmp *offset(%ebx) */ |
| 558 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ |
| 559 | 0x68, /* pushl immediate */ |
| 560 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 561 | 0xe9, /* jmp relative */ |
| 562 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 563 | }; |
| 564 | |
| 565 | /* On VxWorks, the .rel.plt.unloaded section has absolute relocations |
| 566 | for the PLTResolve stub and then for each PLT entry. */ |
| 567 | #define PLTRESOLVE_RELOCS_SHLIB 0 |
| 568 | #define PLTRESOLVE_RELOCS 2 |
| 569 | #define PLT_NON_JUMP_SLOT_RELOCS 2 |
| 570 | |
| 571 | /* The i386 linker needs to keep track of the number of relocs that it |
| 572 | decides to copy as dynamic relocs in check_relocs for each symbol. |
| 573 | This is so that it can later discard them if they are found to be |
| 574 | unnecessary. We store the information in a field extending the |
| 575 | regular ELF linker hash table. */ |
| 576 | |
| 577 | struct elf_i386_dyn_relocs |
| 578 | { |
| 579 | struct elf_i386_dyn_relocs *next; |
| 580 | |
| 581 | /* The input section of the reloc. */ |
| 582 | asection *sec; |
| 583 | |
| 584 | /* Total number of relocs copied for the input section. */ |
| 585 | bfd_size_type count; |
| 586 | |
| 587 | /* Number of pc-relative relocs copied for the input section. */ |
| 588 | bfd_size_type pc_count; |
| 589 | }; |
| 590 | |
| 591 | /* i386 ELF linker hash entry. */ |
| 592 | |
| 593 | struct elf_i386_link_hash_entry |
| 594 | { |
| 595 | struct elf_link_hash_entry elf; |
| 596 | |
| 597 | /* Track dynamic relocs copied for this symbol. */ |
| 598 | struct elf_i386_dyn_relocs *dyn_relocs; |
| 599 | |
| 600 | #define GOT_UNKNOWN 0 |
| 601 | #define GOT_NORMAL 1 |
| 602 | #define GOT_TLS_GD 2 |
| 603 | #define GOT_TLS_IE 4 |
| 604 | #define GOT_TLS_IE_POS 5 |
| 605 | #define GOT_TLS_IE_NEG 6 |
| 606 | #define GOT_TLS_IE_BOTH 7 |
| 607 | #define GOT_TLS_GDESC 8 |
| 608 | #define GOT_TLS_GD_BOTH_P(type) \ |
| 609 | ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) |
| 610 | #define GOT_TLS_GD_P(type) \ |
| 611 | ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) |
| 612 | #define GOT_TLS_GDESC_P(type) \ |
| 613 | ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) |
| 614 | #define GOT_TLS_GD_ANY_P(type) \ |
| 615 | (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) |
| 616 | unsigned char tls_type; |
| 617 | |
| 618 | /* Offset of the GOTPLT entry reserved for the TLS descriptor, |
| 619 | starting at the end of the jump table. */ |
| 620 | bfd_vma tlsdesc_got; |
| 621 | }; |
| 622 | |
| 623 | #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent)) |
| 624 | |
| 625 | struct elf_i386_obj_tdata |
| 626 | { |
| 627 | struct elf_obj_tdata root; |
| 628 | |
| 629 | /* tls_type for each local got entry. */ |
| 630 | char *local_got_tls_type; |
| 631 | |
| 632 | /* GOTPLT entries for TLS descriptors. */ |
| 633 | bfd_vma *local_tlsdesc_gotent; |
| 634 | }; |
| 635 | |
| 636 | #define elf_i386_tdata(abfd) \ |
| 637 | ((struct elf_i386_obj_tdata *) (abfd)->tdata.any) |
| 638 | |
| 639 | #define elf_i386_local_got_tls_type(abfd) \ |
| 640 | (elf_i386_tdata (abfd)->local_got_tls_type) |
| 641 | |
| 642 | #define elf_i386_local_tlsdesc_gotent(abfd) \ |
| 643 | (elf_i386_tdata (abfd)->local_tlsdesc_gotent) |
| 644 | |
| 645 | static bfd_boolean |
| 646 | elf_i386_mkobject (bfd *abfd) |
| 647 | { |
| 648 | if (abfd->tdata.any == NULL) |
| 649 | { |
| 650 | bfd_size_type amt = sizeof (struct elf_i386_obj_tdata); |
| 651 | abfd->tdata.any = bfd_zalloc (abfd, amt); |
| 652 | if (abfd->tdata.any == NULL) |
| 653 | return FALSE; |
| 654 | } |
| 655 | return bfd_elf_mkobject (abfd); |
| 656 | } |
| 657 | |
| 658 | /* i386 ELF linker hash table. */ |
| 659 | |
| 660 | struct elf_i386_link_hash_table |
| 661 | { |
| 662 | struct elf_link_hash_table elf; |
| 663 | |
| 664 | /* Short-cuts to get to dynamic linker sections. */ |
| 665 | asection *sgot; |
| 666 | asection *sgotplt; |
| 667 | asection *srelgot; |
| 668 | asection *splt; |
| 669 | asection *srelplt; |
| 670 | asection *sdynbss; |
| 671 | asection *srelbss; |
| 672 | |
| 673 | /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */ |
| 674 | asection *srelplt2; |
| 675 | |
| 676 | /* True if the target system is VxWorks. */ |
| 677 | int is_vxworks; |
| 678 | |
| 679 | /* Value used to fill the last word of the first plt entry. */ |
| 680 | bfd_byte plt0_pad_byte; |
| 681 | |
| 682 | /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */ |
| 683 | bfd_vma next_tls_desc_index; |
| 684 | |
| 685 | union { |
| 686 | bfd_signed_vma refcount; |
| 687 | bfd_vma offset; |
| 688 | } tls_ldm_got; |
| 689 | |
| 690 | /* The amount of space used by the reserved portion of the sgotplt |
| 691 | section, plus whatever space is used by the jump slots. */ |
| 692 | bfd_vma sgotplt_jump_table_size; |
| 693 | |
| 694 | /* Small local sym to section mapping cache. */ |
| 695 | struct sym_sec_cache sym_sec; |
| 696 | }; |
| 697 | |
| 698 | /* Get the i386 ELF linker hash table from a link_info structure. */ |
| 699 | |
| 700 | #define elf_i386_hash_table(p) \ |
| 701 | ((struct elf_i386_link_hash_table *) ((p)->hash)) |
| 702 | |
| 703 | #define elf_i386_compute_jump_table_size(htab) \ |
| 704 | ((htab)->next_tls_desc_index * 4) |
| 705 | |
| 706 | /* Create an entry in an i386 ELF linker hash table. */ |
| 707 | |
| 708 | static struct bfd_hash_entry * |
| 709 | link_hash_newfunc (struct bfd_hash_entry *entry, |
| 710 | struct bfd_hash_table *table, |
| 711 | const char *string) |
| 712 | { |
| 713 | /* Allocate the structure if it has not already been allocated by a |
| 714 | subclass. */ |
| 715 | if (entry == NULL) |
| 716 | { |
| 717 | entry = bfd_hash_allocate (table, |
| 718 | sizeof (struct elf_i386_link_hash_entry)); |
| 719 | if (entry == NULL) |
| 720 | return entry; |
| 721 | } |
| 722 | |
| 723 | /* Call the allocation method of the superclass. */ |
| 724 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 725 | if (entry != NULL) |
| 726 | { |
| 727 | struct elf_i386_link_hash_entry *eh; |
| 728 | |
| 729 | eh = (struct elf_i386_link_hash_entry *) entry; |
| 730 | eh->dyn_relocs = NULL; |
| 731 | eh->tls_type = GOT_UNKNOWN; |
| 732 | eh->tlsdesc_got = (bfd_vma) -1; |
| 733 | } |
| 734 | |
| 735 | return entry; |
| 736 | } |
| 737 | |
| 738 | /* Create an i386 ELF linker hash table. */ |
| 739 | |
| 740 | static struct bfd_link_hash_table * |
| 741 | elf_i386_link_hash_table_create (bfd *abfd) |
| 742 | { |
| 743 | struct elf_i386_link_hash_table *ret; |
| 744 | bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); |
| 745 | |
| 746 | ret = bfd_malloc (amt); |
| 747 | if (ret == NULL) |
| 748 | return NULL; |
| 749 | |
| 750 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, |
| 751 | sizeof (struct elf_i386_link_hash_entry))) |
| 752 | { |
| 753 | free (ret); |
| 754 | return NULL; |
| 755 | } |
| 756 | |
| 757 | ret->sgot = NULL; |
| 758 | ret->sgotplt = NULL; |
| 759 | ret->srelgot = NULL; |
| 760 | ret->splt = NULL; |
| 761 | ret->srelplt = NULL; |
| 762 | ret->sdynbss = NULL; |
| 763 | ret->srelbss = NULL; |
| 764 | ret->tls_ldm_got.refcount = 0; |
| 765 | ret->next_tls_desc_index = 0; |
| 766 | ret->sgotplt_jump_table_size = 0; |
| 767 | ret->sym_sec.abfd = NULL; |
| 768 | ret->is_vxworks = 0; |
| 769 | ret->srelplt2 = NULL; |
| 770 | ret->plt0_pad_byte = 0; |
| 771 | |
| 772 | return &ret->elf.root; |
| 773 | } |
| 774 | |
| 775 | /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up |
| 776 | shortcuts to them in our hash table. */ |
| 777 | |
| 778 | static bfd_boolean |
| 779 | create_got_section (bfd *dynobj, struct bfd_link_info *info) |
| 780 | { |
| 781 | struct elf_i386_link_hash_table *htab; |
| 782 | |
| 783 | if (! _bfd_elf_create_got_section (dynobj, info)) |
| 784 | return FALSE; |
| 785 | |
| 786 | htab = elf_i386_hash_table (info); |
| 787 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 788 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 789 | if (!htab->sgot || !htab->sgotplt) |
| 790 | abort (); |
| 791 | |
| 792 | htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got", |
| 793 | (SEC_ALLOC | SEC_LOAD |
| 794 | | SEC_HAS_CONTENTS |
| 795 | | SEC_IN_MEMORY |
| 796 | | SEC_LINKER_CREATED |
| 797 | | SEC_READONLY)); |
| 798 | if (htab->srelgot == NULL |
| 799 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2)) |
| 800 | return FALSE; |
| 801 | return TRUE; |
| 802 | } |
| 803 | |
| 804 | /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and |
| 805 | .rel.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 806 | hash table. */ |
| 807 | |
| 808 | static bfd_boolean |
| 809 | elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) |
| 810 | { |
| 811 | struct elf_i386_link_hash_table *htab; |
| 812 | |
| 813 | htab = elf_i386_hash_table (info); |
| 814 | if (!htab->sgot && !create_got_section (dynobj, info)) |
| 815 | return FALSE; |
| 816 | |
| 817 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 818 | return FALSE; |
| 819 | |
| 820 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 821 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt"); |
| 822 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 823 | if (!info->shared) |
| 824 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); |
| 825 | |
| 826 | if (!htab->splt || !htab->srelplt || !htab->sdynbss |
| 827 | || (!info->shared && !htab->srelbss)) |
| 828 | abort (); |
| 829 | |
| 830 | if (htab->is_vxworks |
| 831 | && !elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2)) |
| 832 | return FALSE; |
| 833 | |
| 834 | return TRUE; |
| 835 | } |
| 836 | |
| 837 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 838 | |
| 839 | static void |
| 840 | elf_i386_copy_indirect_symbol (struct bfd_link_info *info, |
| 841 | struct elf_link_hash_entry *dir, |
| 842 | struct elf_link_hash_entry *ind) |
| 843 | { |
| 844 | struct elf_i386_link_hash_entry *edir, *eind; |
| 845 | |
| 846 | edir = (struct elf_i386_link_hash_entry *) dir; |
| 847 | eind = (struct elf_i386_link_hash_entry *) ind; |
| 848 | |
| 849 | if (eind->dyn_relocs != NULL) |
| 850 | { |
| 851 | if (edir->dyn_relocs != NULL) |
| 852 | { |
| 853 | struct elf_i386_dyn_relocs **pp; |
| 854 | struct elf_i386_dyn_relocs *p; |
| 855 | |
| 856 | /* Add reloc counts against the indirect sym to the direct sym |
| 857 | list. Merge any entries against the same section. */ |
| 858 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| 859 | { |
| 860 | struct elf_i386_dyn_relocs *q; |
| 861 | |
| 862 | for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| 863 | if (q->sec == p->sec) |
| 864 | { |
| 865 | q->pc_count += p->pc_count; |
| 866 | q->count += p->count; |
| 867 | *pp = p->next; |
| 868 | break; |
| 869 | } |
| 870 | if (q == NULL) |
| 871 | pp = &p->next; |
| 872 | } |
| 873 | *pp = edir->dyn_relocs; |
| 874 | } |
| 875 | |
| 876 | edir->dyn_relocs = eind->dyn_relocs; |
| 877 | eind->dyn_relocs = NULL; |
| 878 | } |
| 879 | |
| 880 | if (ind->root.type == bfd_link_hash_indirect |
| 881 | && dir->got.refcount <= 0) |
| 882 | { |
| 883 | edir->tls_type = eind->tls_type; |
| 884 | eind->tls_type = GOT_UNKNOWN; |
| 885 | } |
| 886 | |
| 887 | if (ELIMINATE_COPY_RELOCS |
| 888 | && ind->root.type != bfd_link_hash_indirect |
| 889 | && dir->dynamic_adjusted) |
| 890 | { |
| 891 | /* If called to transfer flags for a weakdef during processing |
| 892 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. |
| 893 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ |
| 894 | dir->ref_dynamic |= ind->ref_dynamic; |
| 895 | dir->ref_regular |= ind->ref_regular; |
| 896 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; |
| 897 | dir->needs_plt |= ind->needs_plt; |
| 898 | dir->pointer_equality_needed |= ind->pointer_equality_needed; |
| 899 | } |
| 900 | else |
| 901 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); |
| 902 | } |
| 903 | |
| 904 | typedef union |
| 905 | { |
| 906 | unsigned char c[2]; |
| 907 | uint16_t i; |
| 908 | } |
| 909 | i386_opcode16; |
| 910 | |
| 911 | /* Return TRUE if the TLS access code sequence support transition |
| 912 | from R_TYPE. */ |
| 913 | |
| 914 | static bfd_boolean |
| 915 | elf_i386_check_tls_transition (bfd *abfd, asection *sec, |
| 916 | bfd_byte *contents, |
| 917 | Elf_Internal_Shdr *symtab_hdr, |
| 918 | struct elf_link_hash_entry **sym_hashes, |
| 919 | unsigned int r_type, |
| 920 | const Elf_Internal_Rela *rel, |
| 921 | const Elf_Internal_Rela *relend) |
| 922 | { |
| 923 | unsigned int val, type; |
| 924 | unsigned long r_symndx; |
| 925 | struct elf_link_hash_entry *h; |
| 926 | bfd_vma offset; |
| 927 | |
| 928 | /* Get the section contents. */ |
| 929 | if (contents == NULL) |
| 930 | { |
| 931 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 932 | contents = elf_section_data (sec)->this_hdr.contents; |
| 933 | else |
| 934 | { |
| 935 | /* FIXME: How to better handle error condition? */ |
| 936 | if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 937 | return FALSE; |
| 938 | |
| 939 | /* Cache the section contents for elf_link_input_bfd. */ |
| 940 | elf_section_data (sec)->this_hdr.contents = contents; |
| 941 | } |
| 942 | } |
| 943 | |
| 944 | offset = rel->r_offset; |
| 945 | switch (r_type) |
| 946 | { |
| 947 | case R_386_TLS_GD: |
| 948 | case R_386_TLS_LDM: |
| 949 | if (offset < 2 || (rel + 1) >= relend) |
| 950 | return FALSE; |
| 951 | |
| 952 | type = bfd_get_8 (abfd, contents + offset - 2); |
| 953 | if (r_type == R_386_TLS_GD) |
| 954 | { |
| 955 | /* Check transition from LD access model. Only |
| 956 | leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr |
| 957 | leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop |
| 958 | can transit to different access model. */ |
| 959 | if ((offset + 10) > sec->size || |
| 960 | (type != 0x8d && type != 0x04)) |
| 961 | return FALSE; |
| 962 | |
| 963 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 964 | if (type == 0x04) |
| 965 | { |
| 966 | /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */ |
| 967 | if (offset < 3) |
| 968 | return FALSE; |
| 969 | |
| 970 | if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d) |
| 971 | return FALSE; |
| 972 | |
| 973 | if ((val & 0xc7) != 0x05 || val == (4 << 3)) |
| 974 | return FALSE; |
| 975 | } |
| 976 | else |
| 977 | { |
| 978 | /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */ |
| 979 | if ((val & 0xf8) != 0x80 || (val & 7) == 4) |
| 980 | return FALSE; |
| 981 | |
| 982 | if (bfd_get_8 (abfd, contents + offset + 9) != 0x90) |
| 983 | return FALSE; |
| 984 | } |
| 985 | } |
| 986 | else |
| 987 | { |
| 988 | /* Check transition from LD access model. Only |
| 989 | leal foo@tlsgd(%reg), %eax; call ___tls_get_addr |
| 990 | can transit to different access model. */ |
| 991 | if (type != 0x8d || (offset + 9) > sec->size) |
| 992 | return FALSE; |
| 993 | |
| 994 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 995 | if ((val & 0xf8) != 0x80 || (val & 7) == 4) |
| 996 | return FALSE; |
| 997 | } |
| 998 | |
| 999 | if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8) |
| 1000 | return FALSE; |
| 1001 | |
| 1002 | r_symndx = ELF32_R_SYM (rel[1].r_info); |
| 1003 | if (r_symndx < symtab_hdr->sh_info) |
| 1004 | return FALSE; |
| 1005 | |
| 1006 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1007 | return (h != NULL |
| 1008 | && h->root.root.string != NULL |
| 1009 | && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32 |
| 1010 | || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32) |
| 1011 | && (strcmp (h->root.root.string, "___tls_get_addr") == 0)); |
| 1012 | |
| 1013 | case R_386_TLS_IE: |
| 1014 | /* Check transition from IE access model: |
| 1015 | movl foo@indntpoff(%rip), %eax |
| 1016 | movl foo@indntpoff(%rip), %reg |
| 1017 | addl foo@indntpoff(%rip), %reg |
| 1018 | */ |
| 1019 | |
| 1020 | if (offset < 1 || (offset + 4) > sec->size) |
| 1021 | return FALSE; |
| 1022 | |
| 1023 | /* Check "movl foo@tpoff(%rip), %eax" first. */ |
| 1024 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1025 | if (val == 0xa1) |
| 1026 | return TRUE; |
| 1027 | |
| 1028 | if (offset < 2) |
| 1029 | return FALSE; |
| 1030 | |
| 1031 | /* Check movl|addl foo@tpoff(%rip), %reg. */ |
| 1032 | type = bfd_get_8 (abfd, contents + offset - 2); |
| 1033 | return ((type == 0x8b || type == 0x03) |
| 1034 | && (val & 0xc7) == 0x05); |
| 1035 | |
| 1036 | case R_386_TLS_GOTIE: |
| 1037 | case R_386_TLS_IE_32: |
| 1038 | /* Check transition from {IE_32,GOTIE} access model: |
| 1039 | subl foo@{tpoff,gontoff}(%reg1), %reg2 |
| 1040 | movl foo@{tpoff,gontoff}(%reg1), %reg2 |
| 1041 | addl foo@{tpoff,gontoff}(%reg1), %reg2 |
| 1042 | */ |
| 1043 | |
| 1044 | if (offset < 2 || (offset + 4) > sec->size) |
| 1045 | return FALSE; |
| 1046 | |
| 1047 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1048 | if ((val & 0xc0) != 0x80 || (val & 7) == 4) |
| 1049 | return FALSE; |
| 1050 | |
| 1051 | type = bfd_get_8 (abfd, contents + offset - 2); |
| 1052 | return type == 0x8b || type == 0x2b || type == 0x03; |
| 1053 | |
| 1054 | case R_386_TLS_GOTDESC: |
| 1055 | /* Check transition from GDesc access model: |
| 1056 | leal x@tlsdesc(%ebx), %eax |
| 1057 | |
| 1058 | Make sure it's a leal adding ebx to a 32-bit offset |
| 1059 | into any register, although it's probably almost always |
| 1060 | going to be eax. */ |
| 1061 | |
| 1062 | if (offset < 2 || (offset + 4) > sec->size) |
| 1063 | return FALSE; |
| 1064 | |
| 1065 | if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) |
| 1066 | return FALSE; |
| 1067 | |
| 1068 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1069 | return (val & 0xc7) == 0x83; |
| 1070 | |
| 1071 | case R_386_TLS_DESC_CALL: |
| 1072 | /* Check transition from GDesc access model: |
| 1073 | call *x@tlsdesc(%rax) |
| 1074 | */ |
| 1075 | if (offset + 2 <= sec->size) |
| 1076 | { |
| 1077 | /* Make sure that it's a call *x@tlsdesc(%rax). */ |
| 1078 | static i386_opcode16 call = { { 0xff, 0x10 } }; |
| 1079 | return bfd_get_16 (abfd, contents + offset) == call.i; |
| 1080 | } |
| 1081 | |
| 1082 | return FALSE; |
| 1083 | |
| 1084 | default: |
| 1085 | abort (); |
| 1086 | } |
| 1087 | } |
| 1088 | |
| 1089 | /* Return TRUE if the TLS access transition is OK or no transition |
| 1090 | will be performed. Update R_TYPE if there is a transition. */ |
| 1091 | |
| 1092 | static bfd_boolean |
| 1093 | elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd, |
| 1094 | asection *sec, bfd_byte *contents, |
| 1095 | Elf_Internal_Shdr *symtab_hdr, |
| 1096 | struct elf_link_hash_entry **sym_hashes, |
| 1097 | unsigned int *r_type, int tls_type, |
| 1098 | const Elf_Internal_Rela *rel, |
| 1099 | const Elf_Internal_Rela *relend, |
| 1100 | struct elf_link_hash_entry *h) |
| 1101 | { |
| 1102 | unsigned int from_type = *r_type; |
| 1103 | unsigned int to_type = from_type; |
| 1104 | bfd_boolean check = TRUE; |
| 1105 | |
| 1106 | switch (from_type) |
| 1107 | { |
| 1108 | case R_386_TLS_GD: |
| 1109 | case R_386_TLS_GOTDESC: |
| 1110 | case R_386_TLS_DESC_CALL: |
| 1111 | case R_386_TLS_IE_32: |
| 1112 | case R_386_TLS_IE: |
| 1113 | case R_386_TLS_GOTIE: |
| 1114 | if (!info->shared) |
| 1115 | { |
| 1116 | if (h == NULL) |
| 1117 | to_type = R_386_TLS_LE_32; |
| 1118 | else if (from_type != R_386_TLS_IE |
| 1119 | && from_type != R_386_TLS_GOTIE) |
| 1120 | to_type = R_386_TLS_IE_32; |
| 1121 | } |
| 1122 | |
| 1123 | /* When we are called from elf_i386_relocate_section, CONTENTS |
| 1124 | isn't NULL and there may be additional transitions based on |
| 1125 | TLS_TYPE. */ |
| 1126 | if (contents != NULL) |
| 1127 | { |
| 1128 | unsigned int new_to_type = to_type; |
| 1129 | |
| 1130 | if (!info->shared |
| 1131 | && h != NULL |
| 1132 | && h->dynindx == -1 |
| 1133 | && (tls_type & GOT_TLS_IE)) |
| 1134 | new_to_type = R_386_TLS_LE_32; |
| 1135 | |
| 1136 | if (to_type == R_386_TLS_GD |
| 1137 | || to_type == R_386_TLS_GOTDESC |
| 1138 | || to_type == R_386_TLS_DESC_CALL) |
| 1139 | { |
| 1140 | if (tls_type == GOT_TLS_IE_POS) |
| 1141 | new_to_type = R_386_TLS_GOTIE; |
| 1142 | else if (tls_type & GOT_TLS_IE) |
| 1143 | new_to_type = R_386_TLS_IE_32; |
| 1144 | } |
| 1145 | |
| 1146 | /* We checked the transition before when we were called from |
| 1147 | elf_i386_check_relocs. We only want to check the new |
| 1148 | transition which hasn't been checked before. */ |
| 1149 | check = new_to_type != to_type && from_type == to_type; |
| 1150 | to_type = new_to_type; |
| 1151 | } |
| 1152 | |
| 1153 | break; |
| 1154 | |
| 1155 | case R_386_TLS_LDM: |
| 1156 | if (!info->shared) |
| 1157 | to_type = R_386_TLS_LE_32; |
| 1158 | break; |
| 1159 | |
| 1160 | default: |
| 1161 | return TRUE; |
| 1162 | } |
| 1163 | |
| 1164 | /* Return TRUE if there is no transition. */ |
| 1165 | if (from_type == to_type) |
| 1166 | return TRUE; |
| 1167 | |
| 1168 | /* Check if the transition can be performed. */ |
| 1169 | if (check |
| 1170 | && ! elf_i386_check_tls_transition (abfd, sec, contents, |
| 1171 | symtab_hdr, sym_hashes, |
| 1172 | from_type, rel, relend)) |
| 1173 | { |
| 1174 | reloc_howto_type *from, *to; |
| 1175 | |
| 1176 | from = elf_i386_rtype_to_howto (abfd, from_type); |
| 1177 | to = elf_i386_rtype_to_howto (abfd, to_type); |
| 1178 | |
| 1179 | (*_bfd_error_handler) |
| 1180 | (_("%B: TLS transition from %s to %s against `%s' at 0x%lx " |
| 1181 | "in section `%A' failed"), |
| 1182 | abfd, sec, from->name, to->name, |
| 1183 | h ? h->root.root.string : "a local symbol", |
| 1184 | (unsigned long) rel->r_offset); |
| 1185 | bfd_set_error (bfd_error_bad_value); |
| 1186 | return FALSE; |
| 1187 | } |
| 1188 | |
| 1189 | *r_type = to_type; |
| 1190 | return TRUE; |
| 1191 | } |
| 1192 | |
| 1193 | /* Look through the relocs for a section during the first phase, and |
| 1194 | calculate needed space in the global offset table, procedure linkage |
| 1195 | table, and dynamic reloc sections. */ |
| 1196 | |
| 1197 | static bfd_boolean |
| 1198 | elf_i386_check_relocs (bfd *abfd, |
| 1199 | struct bfd_link_info *info, |
| 1200 | asection *sec, |
| 1201 | const Elf_Internal_Rela *relocs) |
| 1202 | { |
| 1203 | struct elf_i386_link_hash_table *htab; |
| 1204 | Elf_Internal_Shdr *symtab_hdr; |
| 1205 | struct elf_link_hash_entry **sym_hashes; |
| 1206 | const Elf_Internal_Rela *rel; |
| 1207 | const Elf_Internal_Rela *rel_end; |
| 1208 | asection *sreloc; |
| 1209 | |
| 1210 | if (info->relocatable) |
| 1211 | return TRUE; |
| 1212 | |
| 1213 | htab = elf_i386_hash_table (info); |
| 1214 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1215 | sym_hashes = elf_sym_hashes (abfd); |
| 1216 | |
| 1217 | sreloc = NULL; |
| 1218 | |
| 1219 | rel_end = relocs + sec->reloc_count; |
| 1220 | for (rel = relocs; rel < rel_end; rel++) |
| 1221 | { |
| 1222 | unsigned int r_type; |
| 1223 | unsigned long r_symndx; |
| 1224 | struct elf_link_hash_entry *h; |
| 1225 | |
| 1226 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1227 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1228 | |
| 1229 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 1230 | { |
| 1231 | (*_bfd_error_handler) (_("%B: bad symbol index: %d"), |
| 1232 | abfd, |
| 1233 | r_symndx); |
| 1234 | return FALSE; |
| 1235 | } |
| 1236 | |
| 1237 | if (r_symndx < symtab_hdr->sh_info) |
| 1238 | h = NULL; |
| 1239 | else |
| 1240 | { |
| 1241 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1242 | while (h->root.type == bfd_link_hash_indirect |
| 1243 | || h->root.type == bfd_link_hash_warning) |
| 1244 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1245 | } |
| 1246 | |
| 1247 | if (! elf_i386_tls_transition (info, abfd, sec, NULL, |
| 1248 | symtab_hdr, sym_hashes, |
| 1249 | &r_type, GOT_UNKNOWN, |
| 1250 | rel, rel_end, h)) |
| 1251 | return FALSE; |
| 1252 | |
| 1253 | switch (r_type) |
| 1254 | { |
| 1255 | case R_386_TLS_LDM: |
| 1256 | htab->tls_ldm_got.refcount += 1; |
| 1257 | goto create_got; |
| 1258 | |
| 1259 | case R_386_PLT32: |
| 1260 | /* This symbol requires a procedure linkage table entry. We |
| 1261 | actually build the entry in adjust_dynamic_symbol, |
| 1262 | because this might be a case of linking PIC code which is |
| 1263 | never referenced by a dynamic object, in which case we |
| 1264 | don't need to generate a procedure linkage table entry |
| 1265 | after all. */ |
| 1266 | |
| 1267 | /* If this is a local symbol, we resolve it directly without |
| 1268 | creating a procedure linkage table entry. */ |
| 1269 | if (h == NULL) |
| 1270 | continue; |
| 1271 | |
| 1272 | h->needs_plt = 1; |
| 1273 | h->plt.refcount += 1; |
| 1274 | break; |
| 1275 | |
| 1276 | case R_386_TLS_IE_32: |
| 1277 | case R_386_TLS_IE: |
| 1278 | case R_386_TLS_GOTIE: |
| 1279 | if (info->shared) |
| 1280 | info->flags |= DF_STATIC_TLS; |
| 1281 | /* Fall through */ |
| 1282 | |
| 1283 | case R_386_GOT32: |
| 1284 | case R_386_TLS_GD: |
| 1285 | case R_386_TLS_GOTDESC: |
| 1286 | case R_386_TLS_DESC_CALL: |
| 1287 | /* This symbol requires a global offset table entry. */ |
| 1288 | { |
| 1289 | int tls_type, old_tls_type; |
| 1290 | |
| 1291 | switch (r_type) |
| 1292 | { |
| 1293 | default: |
| 1294 | case R_386_GOT32: tls_type = GOT_NORMAL; break; |
| 1295 | case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; |
| 1296 | case R_386_TLS_GOTDESC: |
| 1297 | case R_386_TLS_DESC_CALL: |
| 1298 | tls_type = GOT_TLS_GDESC; break; |
| 1299 | case R_386_TLS_IE_32: |
| 1300 | if (ELF32_R_TYPE (rel->r_info) == r_type) |
| 1301 | tls_type = GOT_TLS_IE_NEG; |
| 1302 | else |
| 1303 | /* If this is a GD->IE transition, we may use either of |
| 1304 | R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ |
| 1305 | tls_type = GOT_TLS_IE; |
| 1306 | break; |
| 1307 | case R_386_TLS_IE: |
| 1308 | case R_386_TLS_GOTIE: |
| 1309 | tls_type = GOT_TLS_IE_POS; break; |
| 1310 | } |
| 1311 | |
| 1312 | if (h != NULL) |
| 1313 | { |
| 1314 | h->got.refcount += 1; |
| 1315 | old_tls_type = elf_i386_hash_entry(h)->tls_type; |
| 1316 | } |
| 1317 | else |
| 1318 | { |
| 1319 | bfd_signed_vma *local_got_refcounts; |
| 1320 | |
| 1321 | /* This is a global offset table entry for a local symbol. */ |
| 1322 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1323 | if (local_got_refcounts == NULL) |
| 1324 | { |
| 1325 | bfd_size_type size; |
| 1326 | |
| 1327 | size = symtab_hdr->sh_info; |
| 1328 | size *= (sizeof (bfd_signed_vma) |
| 1329 | + sizeof (bfd_vma) + sizeof(char)); |
| 1330 | local_got_refcounts = bfd_zalloc (abfd, size); |
| 1331 | if (local_got_refcounts == NULL) |
| 1332 | return FALSE; |
| 1333 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 1334 | elf_i386_local_tlsdesc_gotent (abfd) |
| 1335 | = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); |
| 1336 | elf_i386_local_got_tls_type (abfd) |
| 1337 | = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); |
| 1338 | } |
| 1339 | local_got_refcounts[r_symndx] += 1; |
| 1340 | old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx]; |
| 1341 | } |
| 1342 | |
| 1343 | if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) |
| 1344 | tls_type |= old_tls_type; |
| 1345 | /* If a TLS symbol is accessed using IE at least once, |
| 1346 | there is no point to use dynamic model for it. */ |
| 1347 | else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN |
| 1348 | && (! GOT_TLS_GD_ANY_P (old_tls_type) |
| 1349 | || (tls_type & GOT_TLS_IE) == 0)) |
| 1350 | { |
| 1351 | if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type)) |
| 1352 | tls_type = old_tls_type; |
| 1353 | else if (GOT_TLS_GD_ANY_P (old_tls_type) |
| 1354 | && GOT_TLS_GD_ANY_P (tls_type)) |
| 1355 | tls_type |= old_tls_type; |
| 1356 | else |
| 1357 | { |
| 1358 | (*_bfd_error_handler) |
| 1359 | (_("%B: `%s' accessed both as normal and " |
| 1360 | "thread local symbol"), |
| 1361 | abfd, |
| 1362 | h ? h->root.root.string : "<local>"); |
| 1363 | return FALSE; |
| 1364 | } |
| 1365 | } |
| 1366 | |
| 1367 | if (old_tls_type != tls_type) |
| 1368 | { |
| 1369 | if (h != NULL) |
| 1370 | elf_i386_hash_entry (h)->tls_type = tls_type; |
| 1371 | else |
| 1372 | elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type; |
| 1373 | } |
| 1374 | } |
| 1375 | /* Fall through */ |
| 1376 | |
| 1377 | case R_386_GOTOFF: |
| 1378 | case R_386_GOTPC: |
| 1379 | create_got: |
| 1380 | if (htab->sgot == NULL) |
| 1381 | { |
| 1382 | if (htab->elf.dynobj == NULL) |
| 1383 | htab->elf.dynobj = abfd; |
| 1384 | if (!create_got_section (htab->elf.dynobj, info)) |
| 1385 | return FALSE; |
| 1386 | } |
| 1387 | if (r_type != R_386_TLS_IE) |
| 1388 | break; |
| 1389 | /* Fall through */ |
| 1390 | |
| 1391 | case R_386_TLS_LE_32: |
| 1392 | case R_386_TLS_LE: |
| 1393 | if (!info->shared) |
| 1394 | break; |
| 1395 | info->flags |= DF_STATIC_TLS; |
| 1396 | /* Fall through */ |
| 1397 | |
| 1398 | case R_386_32: |
| 1399 | case R_386_PC32: |
| 1400 | if (h != NULL && !info->shared) |
| 1401 | { |
| 1402 | /* If this reloc is in a read-only section, we might |
| 1403 | need a copy reloc. We can't check reliably at this |
| 1404 | stage whether the section is read-only, as input |
| 1405 | sections have not yet been mapped to output sections. |
| 1406 | Tentatively set the flag for now, and correct in |
| 1407 | adjust_dynamic_symbol. */ |
| 1408 | h->non_got_ref = 1; |
| 1409 | |
| 1410 | /* We may need a .plt entry if the function this reloc |
| 1411 | refers to is in a shared lib. */ |
| 1412 | h->plt.refcount += 1; |
| 1413 | if (r_type != R_386_PC32) |
| 1414 | h->pointer_equality_needed = 1; |
| 1415 | } |
| 1416 | |
| 1417 | /* If we are creating a shared library, and this is a reloc |
| 1418 | against a global symbol, or a non PC relative reloc |
| 1419 | against a local symbol, then we need to copy the reloc |
| 1420 | into the shared library. However, if we are linking with |
| 1421 | -Bsymbolic, we do not need to copy a reloc against a |
| 1422 | global symbol which is defined in an object we are |
| 1423 | including in the link (i.e., DEF_REGULAR is set). At |
| 1424 | this point we have not seen all the input files, so it is |
| 1425 | possible that DEF_REGULAR is not set now but will be set |
| 1426 | later (it is never cleared). In case of a weak definition, |
| 1427 | DEF_REGULAR may be cleared later by a strong definition in |
| 1428 | a shared library. We account for that possibility below by |
| 1429 | storing information in the relocs_copied field of the hash |
| 1430 | table entry. A similar situation occurs when creating |
| 1431 | shared libraries and symbol visibility changes render the |
| 1432 | symbol local. |
| 1433 | |
| 1434 | If on the other hand, we are creating an executable, we |
| 1435 | may need to keep relocations for symbols satisfied by a |
| 1436 | dynamic library if we manage to avoid copy relocs for the |
| 1437 | symbol. */ |
| 1438 | if ((info->shared |
| 1439 | && (sec->flags & SEC_ALLOC) != 0 |
| 1440 | && (r_type != R_386_PC32 |
| 1441 | || (h != NULL |
| 1442 | && (! SYMBOLIC_BIND (info, h) |
| 1443 | || h->root.type == bfd_link_hash_defweak |
| 1444 | || !h->def_regular)))) |
| 1445 | || (ELIMINATE_COPY_RELOCS |
| 1446 | && !info->shared |
| 1447 | && (sec->flags & SEC_ALLOC) != 0 |
| 1448 | && h != NULL |
| 1449 | && (h->root.type == bfd_link_hash_defweak |
| 1450 | || !h->def_regular))) |
| 1451 | { |
| 1452 | struct elf_i386_dyn_relocs *p; |
| 1453 | struct elf_i386_dyn_relocs **head; |
| 1454 | |
| 1455 | /* We must copy these reloc types into the output file. |
| 1456 | Create a reloc section in dynobj and make room for |
| 1457 | this reloc. */ |
| 1458 | if (sreloc == NULL) |
| 1459 | { |
| 1460 | const char *name; |
| 1461 | bfd *dynobj; |
| 1462 | unsigned int strndx = elf_elfheader (abfd)->e_shstrndx; |
| 1463 | unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name; |
| 1464 | |
| 1465 | name = bfd_elf_string_from_elf_section (abfd, strndx, shnam); |
| 1466 | if (name == NULL) |
| 1467 | return FALSE; |
| 1468 | |
| 1469 | if (! CONST_STRNEQ (name, ".rel") |
| 1470 | || strcmp (bfd_get_section_name (abfd, sec), |
| 1471 | name + 4) != 0) |
| 1472 | { |
| 1473 | (*_bfd_error_handler) |
| 1474 | (_("%B: bad relocation section name `%s\'"), |
| 1475 | abfd, name); |
| 1476 | } |
| 1477 | |
| 1478 | if (htab->elf.dynobj == NULL) |
| 1479 | htab->elf.dynobj = abfd; |
| 1480 | |
| 1481 | dynobj = htab->elf.dynobj; |
| 1482 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 1483 | if (sreloc == NULL) |
| 1484 | { |
| 1485 | flagword flags; |
| 1486 | |
| 1487 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 1488 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 1489 | if ((sec->flags & SEC_ALLOC) != 0) |
| 1490 | flags |= SEC_ALLOC | SEC_LOAD; |
| 1491 | sreloc = bfd_make_section_with_flags (dynobj, |
| 1492 | name, |
| 1493 | flags); |
| 1494 | if (sreloc == NULL |
| 1495 | || ! bfd_set_section_alignment (dynobj, sreloc, 2)) |
| 1496 | return FALSE; |
| 1497 | } |
| 1498 | elf_section_data (sec)->sreloc = sreloc; |
| 1499 | } |
| 1500 | |
| 1501 | /* If this is a global symbol, we count the number of |
| 1502 | relocations we need for this symbol. */ |
| 1503 | if (h != NULL) |
| 1504 | { |
| 1505 | head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs; |
| 1506 | } |
| 1507 | else |
| 1508 | { |
| 1509 | void **vpp; |
| 1510 | /* Track dynamic relocs needed for local syms too. |
| 1511 | We really need local syms available to do this |
| 1512 | easily. Oh well. */ |
| 1513 | |
| 1514 | asection *s; |
| 1515 | s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, |
| 1516 | sec, r_symndx); |
| 1517 | if (s == NULL) |
| 1518 | return FALSE; |
| 1519 | |
| 1520 | vpp = &elf_section_data (s)->local_dynrel; |
| 1521 | head = (struct elf_i386_dyn_relocs **)vpp; |
| 1522 | } |
| 1523 | |
| 1524 | p = *head; |
| 1525 | if (p == NULL || p->sec != sec) |
| 1526 | { |
| 1527 | bfd_size_type amt = sizeof *p; |
| 1528 | p = bfd_alloc (htab->elf.dynobj, amt); |
| 1529 | if (p == NULL) |
| 1530 | return FALSE; |
| 1531 | p->next = *head; |
| 1532 | *head = p; |
| 1533 | p->sec = sec; |
| 1534 | p->count = 0; |
| 1535 | p->pc_count = 0; |
| 1536 | } |
| 1537 | |
| 1538 | p->count += 1; |
| 1539 | if (r_type == R_386_PC32) |
| 1540 | p->pc_count += 1; |
| 1541 | } |
| 1542 | break; |
| 1543 | |
| 1544 | /* This relocation describes the C++ object vtable hierarchy. |
| 1545 | Reconstruct it for later use during GC. */ |
| 1546 | case R_386_GNU_VTINHERIT: |
| 1547 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 1548 | return FALSE; |
| 1549 | break; |
| 1550 | |
| 1551 | /* This relocation describes which C++ vtable entries are actually |
| 1552 | used. Record for later use during GC. */ |
| 1553 | case R_386_GNU_VTENTRY: |
| 1554 | BFD_ASSERT (h != NULL); |
| 1555 | if (h != NULL |
| 1556 | && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
| 1557 | return FALSE; |
| 1558 | break; |
| 1559 | |
| 1560 | default: |
| 1561 | break; |
| 1562 | } |
| 1563 | } |
| 1564 | |
| 1565 | return TRUE; |
| 1566 | } |
| 1567 | |
| 1568 | /* Return the section that should be marked against GC for a given |
| 1569 | relocation. */ |
| 1570 | |
| 1571 | static asection * |
| 1572 | elf_i386_gc_mark_hook (asection *sec, |
| 1573 | struct bfd_link_info *info, |
| 1574 | Elf_Internal_Rela *rel, |
| 1575 | struct elf_link_hash_entry *h, |
| 1576 | Elf_Internal_Sym *sym) |
| 1577 | { |
| 1578 | if (h != NULL) |
| 1579 | switch (ELF32_R_TYPE (rel->r_info)) |
| 1580 | { |
| 1581 | case R_386_GNU_VTINHERIT: |
| 1582 | case R_386_GNU_VTENTRY: |
| 1583 | return NULL; |
| 1584 | } |
| 1585 | |
| 1586 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 1587 | } |
| 1588 | |
| 1589 | /* Update the got entry reference counts for the section being removed. */ |
| 1590 | |
| 1591 | static bfd_boolean |
| 1592 | elf_i386_gc_sweep_hook (bfd *abfd, |
| 1593 | struct bfd_link_info *info, |
| 1594 | asection *sec, |
| 1595 | const Elf_Internal_Rela *relocs) |
| 1596 | { |
| 1597 | Elf_Internal_Shdr *symtab_hdr; |
| 1598 | struct elf_link_hash_entry **sym_hashes; |
| 1599 | bfd_signed_vma *local_got_refcounts; |
| 1600 | const Elf_Internal_Rela *rel, *relend; |
| 1601 | |
| 1602 | elf_section_data (sec)->local_dynrel = NULL; |
| 1603 | |
| 1604 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1605 | sym_hashes = elf_sym_hashes (abfd); |
| 1606 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1607 | |
| 1608 | relend = relocs + sec->reloc_count; |
| 1609 | for (rel = relocs; rel < relend; rel++) |
| 1610 | { |
| 1611 | unsigned long r_symndx; |
| 1612 | unsigned int r_type; |
| 1613 | struct elf_link_hash_entry *h = NULL; |
| 1614 | |
| 1615 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1616 | if (r_symndx >= symtab_hdr->sh_info) |
| 1617 | { |
| 1618 | struct elf_i386_link_hash_entry *eh; |
| 1619 | struct elf_i386_dyn_relocs **pp; |
| 1620 | struct elf_i386_dyn_relocs *p; |
| 1621 | |
| 1622 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1623 | while (h->root.type == bfd_link_hash_indirect |
| 1624 | || h->root.type == bfd_link_hash_warning) |
| 1625 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1626 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1627 | |
| 1628 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| 1629 | if (p->sec == sec) |
| 1630 | { |
| 1631 | /* Everything must go for SEC. */ |
| 1632 | *pp = p->next; |
| 1633 | break; |
| 1634 | } |
| 1635 | } |
| 1636 | |
| 1637 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1638 | if (! elf_i386_tls_transition (info, abfd, sec, NULL, |
| 1639 | symtab_hdr, sym_hashes, |
| 1640 | &r_type, GOT_UNKNOWN, |
| 1641 | rel, relend, h)) |
| 1642 | return FALSE; |
| 1643 | |
| 1644 | switch (r_type) |
| 1645 | { |
| 1646 | case R_386_TLS_LDM: |
| 1647 | if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0) |
| 1648 | elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1; |
| 1649 | break; |
| 1650 | |
| 1651 | case R_386_TLS_GD: |
| 1652 | case R_386_TLS_GOTDESC: |
| 1653 | case R_386_TLS_DESC_CALL: |
| 1654 | case R_386_TLS_IE_32: |
| 1655 | case R_386_TLS_IE: |
| 1656 | case R_386_TLS_GOTIE: |
| 1657 | case R_386_GOT32: |
| 1658 | if (h != NULL) |
| 1659 | { |
| 1660 | if (h->got.refcount > 0) |
| 1661 | h->got.refcount -= 1; |
| 1662 | } |
| 1663 | else if (local_got_refcounts != NULL) |
| 1664 | { |
| 1665 | if (local_got_refcounts[r_symndx] > 0) |
| 1666 | local_got_refcounts[r_symndx] -= 1; |
| 1667 | } |
| 1668 | break; |
| 1669 | |
| 1670 | case R_386_32: |
| 1671 | case R_386_PC32: |
| 1672 | if (info->shared) |
| 1673 | break; |
| 1674 | /* Fall through */ |
| 1675 | |
| 1676 | case R_386_PLT32: |
| 1677 | if (h != NULL) |
| 1678 | { |
| 1679 | if (h->plt.refcount > 0) |
| 1680 | h->plt.refcount -= 1; |
| 1681 | } |
| 1682 | break; |
| 1683 | |
| 1684 | default: |
| 1685 | break; |
| 1686 | } |
| 1687 | } |
| 1688 | |
| 1689 | return TRUE; |
| 1690 | } |
| 1691 | |
| 1692 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 1693 | regular object. The current definition is in some section of the |
| 1694 | dynamic object, but we're not including those sections. We have to |
| 1695 | change the definition to something the rest of the link can |
| 1696 | understand. */ |
| 1697 | |
| 1698 | static bfd_boolean |
| 1699 | elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info, |
| 1700 | struct elf_link_hash_entry *h) |
| 1701 | { |
| 1702 | struct elf_i386_link_hash_table *htab; |
| 1703 | asection *s; |
| 1704 | |
| 1705 | /* If this is a function, put it in the procedure linkage table. We |
| 1706 | will fill in the contents of the procedure linkage table later, |
| 1707 | when we know the address of the .got section. */ |
| 1708 | if (h->type == STT_FUNC |
| 1709 | || h->needs_plt) |
| 1710 | { |
| 1711 | if (h->plt.refcount <= 0 |
| 1712 | || SYMBOL_CALLS_LOCAL (info, h) |
| 1713 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 1714 | && h->root.type == bfd_link_hash_undefweak)) |
| 1715 | { |
| 1716 | /* This case can occur if we saw a PLT32 reloc in an input |
| 1717 | file, but the symbol was never referred to by a dynamic |
| 1718 | object, or if all references were garbage collected. In |
| 1719 | such a case, we don't actually need to build a procedure |
| 1720 | linkage table, and we can just do a PC32 reloc instead. */ |
| 1721 | h->plt.offset = (bfd_vma) -1; |
| 1722 | h->needs_plt = 0; |
| 1723 | } |
| 1724 | |
| 1725 | return TRUE; |
| 1726 | } |
| 1727 | else |
| 1728 | /* It's possible that we incorrectly decided a .plt reloc was |
| 1729 | needed for an R_386_PC32 reloc to a non-function sym in |
| 1730 | check_relocs. We can't decide accurately between function and |
| 1731 | non-function syms in check-relocs; Objects loaded later in |
| 1732 | the link may change h->type. So fix it now. */ |
| 1733 | h->plt.offset = (bfd_vma) -1; |
| 1734 | |
| 1735 | /* If this is a weak symbol, and there is a real definition, the |
| 1736 | processor independent code will have arranged for us to see the |
| 1737 | real definition first, and we can just use the same value. */ |
| 1738 | if (h->u.weakdef != NULL) |
| 1739 | { |
| 1740 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined |
| 1741 | || h->u.weakdef->root.type == bfd_link_hash_defweak); |
| 1742 | h->root.u.def.section = h->u.weakdef->root.u.def.section; |
| 1743 | h->root.u.def.value = h->u.weakdef->root.u.def.value; |
| 1744 | if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) |
| 1745 | h->non_got_ref = h->u.weakdef->non_got_ref; |
| 1746 | return TRUE; |
| 1747 | } |
| 1748 | |
| 1749 | /* This is a reference to a symbol defined by a dynamic object which |
| 1750 | is not a function. */ |
| 1751 | |
| 1752 | /* If we are creating a shared library, we must presume that the |
| 1753 | only references to the symbol are via the global offset table. |
| 1754 | For such cases we need not do anything here; the relocations will |
| 1755 | be handled correctly by relocate_section. */ |
| 1756 | if (info->shared) |
| 1757 | return TRUE; |
| 1758 | |
| 1759 | /* If there are no references to this symbol that do not use the |
| 1760 | GOT, we don't need to generate a copy reloc. */ |
| 1761 | if (!h->non_got_ref) |
| 1762 | return TRUE; |
| 1763 | |
| 1764 | /* If -z nocopyreloc was given, we won't generate them either. */ |
| 1765 | if (info->nocopyreloc) |
| 1766 | { |
| 1767 | h->non_got_ref = 0; |
| 1768 | return TRUE; |
| 1769 | } |
| 1770 | |
| 1771 | htab = elf_i386_hash_table (info); |
| 1772 | |
| 1773 | /* If there aren't any dynamic relocs in read-only sections, then |
| 1774 | we can keep the dynamic relocs and avoid the copy reloc. This |
| 1775 | doesn't work on VxWorks, where we can not have dynamic relocations |
| 1776 | (other than copy and jump slot relocations) in an executable. */ |
| 1777 | if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks) |
| 1778 | { |
| 1779 | struct elf_i386_link_hash_entry * eh; |
| 1780 | struct elf_i386_dyn_relocs *p; |
| 1781 | |
| 1782 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1783 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1784 | { |
| 1785 | s = p->sec->output_section; |
| 1786 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1787 | break; |
| 1788 | } |
| 1789 | |
| 1790 | if (p == NULL) |
| 1791 | { |
| 1792 | h->non_got_ref = 0; |
| 1793 | return TRUE; |
| 1794 | } |
| 1795 | } |
| 1796 | |
| 1797 | if (h->size == 0) |
| 1798 | { |
| 1799 | (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), |
| 1800 | h->root.root.string); |
| 1801 | return TRUE; |
| 1802 | } |
| 1803 | |
| 1804 | /* We must allocate the symbol in our .dynbss section, which will |
| 1805 | become part of the .bss section of the executable. There will be |
| 1806 | an entry for this symbol in the .dynsym section. The dynamic |
| 1807 | object will contain position independent code, so all references |
| 1808 | from the dynamic object to this symbol will go through the global |
| 1809 | offset table. The dynamic linker will use the .dynsym entry to |
| 1810 | determine the address it must put in the global offset table, so |
| 1811 | both the dynamic object and the regular object will refer to the |
| 1812 | same memory location for the variable. */ |
| 1813 | |
| 1814 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to |
| 1815 | copy the initial value out of the dynamic object and into the |
| 1816 | runtime process image. */ |
| 1817 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 1818 | { |
| 1819 | htab->srelbss->size += sizeof (Elf32_External_Rel); |
| 1820 | h->needs_copy = 1; |
| 1821 | } |
| 1822 | |
| 1823 | s = htab->sdynbss; |
| 1824 | |
| 1825 | return _bfd_elf_adjust_dynamic_copy (h, s); |
| 1826 | } |
| 1827 | |
| 1828 | /* Allocate space in .plt, .got and associated reloc sections for |
| 1829 | dynamic relocs. */ |
| 1830 | |
| 1831 | static bfd_boolean |
| 1832 | allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
| 1833 | { |
| 1834 | struct bfd_link_info *info; |
| 1835 | struct elf_i386_link_hash_table *htab; |
| 1836 | struct elf_i386_link_hash_entry *eh; |
| 1837 | struct elf_i386_dyn_relocs *p; |
| 1838 | |
| 1839 | if (h->root.type == bfd_link_hash_indirect) |
| 1840 | return TRUE; |
| 1841 | |
| 1842 | if (h->root.type == bfd_link_hash_warning) |
| 1843 | /* When warning symbols are created, they **replace** the "real" |
| 1844 | entry in the hash table, thus we never get to see the real |
| 1845 | symbol in a hash traversal. So look at it now. */ |
| 1846 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1847 | |
| 1848 | info = (struct bfd_link_info *) inf; |
| 1849 | htab = elf_i386_hash_table (info); |
| 1850 | |
| 1851 | if (htab->elf.dynamic_sections_created |
| 1852 | && h->plt.refcount > 0) |
| 1853 | { |
| 1854 | /* Make sure this symbol is output as a dynamic symbol. |
| 1855 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1856 | if (h->dynindx == -1 |
| 1857 | && !h->forced_local) |
| 1858 | { |
| 1859 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1860 | return FALSE; |
| 1861 | } |
| 1862 | |
| 1863 | if (info->shared |
| 1864 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) |
| 1865 | { |
| 1866 | asection *s = htab->splt; |
| 1867 | |
| 1868 | /* If this is the first .plt entry, make room for the special |
| 1869 | first entry. */ |
| 1870 | if (s->size == 0) |
| 1871 | s->size += PLT_ENTRY_SIZE; |
| 1872 | |
| 1873 | h->plt.offset = s->size; |
| 1874 | |
| 1875 | /* If this symbol is not defined in a regular file, and we are |
| 1876 | not generating a shared library, then set the symbol to this |
| 1877 | location in the .plt. This is required to make function |
| 1878 | pointers compare as equal between the normal executable and |
| 1879 | the shared library. */ |
| 1880 | if (! info->shared |
| 1881 | && !h->def_regular) |
| 1882 | { |
| 1883 | h->root.u.def.section = s; |
| 1884 | h->root.u.def.value = h->plt.offset; |
| 1885 | } |
| 1886 | |
| 1887 | /* Make room for this entry. */ |
| 1888 | s->size += PLT_ENTRY_SIZE; |
| 1889 | |
| 1890 | /* We also need to make an entry in the .got.plt section, which |
| 1891 | will be placed in the .got section by the linker script. */ |
| 1892 | htab->sgotplt->size += 4; |
| 1893 | |
| 1894 | /* We also need to make an entry in the .rel.plt section. */ |
| 1895 | htab->srelplt->size += sizeof (Elf32_External_Rel); |
| 1896 | htab->next_tls_desc_index++; |
| 1897 | |
| 1898 | if (htab->is_vxworks && !info->shared) |
| 1899 | { |
| 1900 | /* VxWorks has a second set of relocations for each PLT entry |
| 1901 | in executables. They go in a separate relocation section, |
| 1902 | which is processed by the kernel loader. */ |
| 1903 | |
| 1904 | /* There are two relocations for the initial PLT entry: an |
| 1905 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an |
| 1906 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ |
| 1907 | |
| 1908 | if (h->plt.offset == PLT_ENTRY_SIZE) |
| 1909 | htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); |
| 1910 | |
| 1911 | /* There are two extra relocations for each subsequent PLT entry: |
| 1912 | an R_386_32 relocation for the GOT entry, and an R_386_32 |
| 1913 | relocation for the PLT entry. */ |
| 1914 | |
| 1915 | htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); |
| 1916 | } |
| 1917 | } |
| 1918 | else |
| 1919 | { |
| 1920 | h->plt.offset = (bfd_vma) -1; |
| 1921 | h->needs_plt = 0; |
| 1922 | } |
| 1923 | } |
| 1924 | else |
| 1925 | { |
| 1926 | h->plt.offset = (bfd_vma) -1; |
| 1927 | h->needs_plt = 0; |
| 1928 | } |
| 1929 | |
| 1930 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1931 | eh->tlsdesc_got = (bfd_vma) -1; |
| 1932 | |
| 1933 | /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary, |
| 1934 | make it a R_386_TLS_LE_32 requiring no TLS entry. */ |
| 1935 | if (h->got.refcount > 0 |
| 1936 | && !info->shared |
| 1937 | && h->dynindx == -1 |
| 1938 | && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE)) |
| 1939 | h->got.offset = (bfd_vma) -1; |
| 1940 | else if (h->got.refcount > 0) |
| 1941 | { |
| 1942 | asection *s; |
| 1943 | bfd_boolean dyn; |
| 1944 | int tls_type = elf_i386_hash_entry(h)->tls_type; |
| 1945 | |
| 1946 | /* Make sure this symbol is output as a dynamic symbol. |
| 1947 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1948 | if (h->dynindx == -1 |
| 1949 | && !h->forced_local) |
| 1950 | { |
| 1951 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1952 | return FALSE; |
| 1953 | } |
| 1954 | |
| 1955 | s = htab->sgot; |
| 1956 | if (GOT_TLS_GDESC_P (tls_type)) |
| 1957 | { |
| 1958 | eh->tlsdesc_got = htab->sgotplt->size |
| 1959 | - elf_i386_compute_jump_table_size (htab); |
| 1960 | htab->sgotplt->size += 8; |
| 1961 | h->got.offset = (bfd_vma) -2; |
| 1962 | } |
| 1963 | if (! GOT_TLS_GDESC_P (tls_type) |
| 1964 | || GOT_TLS_GD_P (tls_type)) |
| 1965 | { |
| 1966 | h->got.offset = s->size; |
| 1967 | s->size += 4; |
| 1968 | /* R_386_TLS_GD needs 2 consecutive GOT slots. */ |
| 1969 | if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH) |
| 1970 | s->size += 4; |
| 1971 | } |
| 1972 | dyn = htab->elf.dynamic_sections_created; |
| 1973 | /* R_386_TLS_IE_32 needs one dynamic relocation, |
| 1974 | R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, |
| 1975 | (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we |
| 1976 | need two), R_386_TLS_GD needs one if local symbol and two if |
| 1977 | global. */ |
| 1978 | if (tls_type == GOT_TLS_IE_BOTH) |
| 1979 | htab->srelgot->size += 2 * sizeof (Elf32_External_Rel); |
| 1980 | else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) |
| 1981 | || (tls_type & GOT_TLS_IE)) |
| 1982 | htab->srelgot->size += sizeof (Elf32_External_Rel); |
| 1983 | else if (GOT_TLS_GD_P (tls_type)) |
| 1984 | htab->srelgot->size += 2 * sizeof (Elf32_External_Rel); |
| 1985 | else if (! GOT_TLS_GDESC_P (tls_type) |
| 1986 | && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 1987 | || h->root.type != bfd_link_hash_undefweak) |
| 1988 | && (info->shared |
| 1989 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) |
| 1990 | htab->srelgot->size += sizeof (Elf32_External_Rel); |
| 1991 | if (GOT_TLS_GDESC_P (tls_type)) |
| 1992 | htab->srelplt->size += sizeof (Elf32_External_Rel); |
| 1993 | } |
| 1994 | else |
| 1995 | h->got.offset = (bfd_vma) -1; |
| 1996 | |
| 1997 | if (eh->dyn_relocs == NULL) |
| 1998 | return TRUE; |
| 1999 | |
| 2000 | /* In the shared -Bsymbolic case, discard space allocated for |
| 2001 | dynamic pc-relative relocs against symbols which turn out to be |
| 2002 | defined in regular objects. For the normal shared case, discard |
| 2003 | space for pc-relative relocs that have become local due to symbol |
| 2004 | visibility changes. */ |
| 2005 | |
| 2006 | if (info->shared) |
| 2007 | { |
| 2008 | /* The only reloc that uses pc_count is R_386_PC32, which will |
| 2009 | appear on a call or on something like ".long foo - .". We |
| 2010 | want calls to protected symbols to resolve directly to the |
| 2011 | function rather than going via the plt. If people want |
| 2012 | function pointer comparisons to work as expected then they |
| 2013 | should avoid writing assembly like ".long foo - .". */ |
| 2014 | if (SYMBOL_CALLS_LOCAL (info, h)) |
| 2015 | { |
| 2016 | struct elf_i386_dyn_relocs **pp; |
| 2017 | |
| 2018 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 2019 | { |
| 2020 | p->count -= p->pc_count; |
| 2021 | p->pc_count = 0; |
| 2022 | if (p->count == 0) |
| 2023 | *pp = p->next; |
| 2024 | else |
| 2025 | pp = &p->next; |
| 2026 | } |
| 2027 | } |
| 2028 | |
| 2029 | /* Also discard relocs on undefined weak syms with non-default |
| 2030 | visibility. */ |
| 2031 | if (eh->dyn_relocs != NULL |
| 2032 | && h->root.type == bfd_link_hash_undefweak) |
| 2033 | { |
| 2034 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 2035 | eh->dyn_relocs = NULL; |
| 2036 | |
| 2037 | /* Make sure undefined weak symbols are output as a dynamic |
| 2038 | symbol in PIEs. */ |
| 2039 | else if (h->dynindx == -1 |
| 2040 | && !h->forced_local) |
| 2041 | { |
| 2042 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2043 | return FALSE; |
| 2044 | } |
| 2045 | } |
| 2046 | } |
| 2047 | else if (ELIMINATE_COPY_RELOCS) |
| 2048 | { |
| 2049 | /* For the non-shared case, discard space for relocs against |
| 2050 | symbols which turn out to need copy relocs or are not |
| 2051 | dynamic. */ |
| 2052 | |
| 2053 | if (!h->non_got_ref |
| 2054 | && ((h->def_dynamic |
| 2055 | && !h->def_regular) |
| 2056 | || (htab->elf.dynamic_sections_created |
| 2057 | && (h->root.type == bfd_link_hash_undefweak |
| 2058 | || h->root.type == bfd_link_hash_undefined)))) |
| 2059 | { |
| 2060 | /* Make sure this symbol is output as a dynamic symbol. |
| 2061 | Undefined weak syms won't yet be marked as dynamic. */ |
| 2062 | if (h->dynindx == -1 |
| 2063 | && !h->forced_local) |
| 2064 | { |
| 2065 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2066 | return FALSE; |
| 2067 | } |
| 2068 | |
| 2069 | /* If that succeeded, we know we'll be keeping all the |
| 2070 | relocs. */ |
| 2071 | if (h->dynindx != -1) |
| 2072 | goto keep; |
| 2073 | } |
| 2074 | |
| 2075 | eh->dyn_relocs = NULL; |
| 2076 | |
| 2077 | keep: ; |
| 2078 | } |
| 2079 | |
| 2080 | /* Finally, allocate space. */ |
| 2081 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 2082 | { |
| 2083 | asection *sreloc = elf_section_data (p->sec)->sreloc; |
| 2084 | sreloc->size += p->count * sizeof (Elf32_External_Rel); |
| 2085 | } |
| 2086 | |
| 2087 | return TRUE; |
| 2088 | } |
| 2089 | |
| 2090 | /* Find any dynamic relocs that apply to read-only sections. */ |
| 2091 | |
| 2092 | static bfd_boolean |
| 2093 | readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
| 2094 | { |
| 2095 | struct elf_i386_link_hash_entry *eh; |
| 2096 | struct elf_i386_dyn_relocs *p; |
| 2097 | |
| 2098 | if (h->root.type == bfd_link_hash_warning) |
| 2099 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2100 | |
| 2101 | eh = (struct elf_i386_link_hash_entry *) h; |
| 2102 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 2103 | { |
| 2104 | asection *s = p->sec->output_section; |
| 2105 | |
| 2106 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 2107 | { |
| 2108 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 2109 | |
| 2110 | info->flags |= DF_TEXTREL; |
| 2111 | |
| 2112 | /* Not an error, just cut short the traversal. */ |
| 2113 | return FALSE; |
| 2114 | } |
| 2115 | } |
| 2116 | return TRUE; |
| 2117 | } |
| 2118 | |
| 2119 | /* Set the sizes of the dynamic sections. */ |
| 2120 | |
| 2121 | static bfd_boolean |
| 2122 | elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 2123 | struct bfd_link_info *info) |
| 2124 | { |
| 2125 | struct elf_i386_link_hash_table *htab; |
| 2126 | bfd *dynobj; |
| 2127 | asection *s; |
| 2128 | bfd_boolean relocs; |
| 2129 | bfd *ibfd; |
| 2130 | |
| 2131 | htab = elf_i386_hash_table (info); |
| 2132 | dynobj = htab->elf.dynobj; |
| 2133 | if (dynobj == NULL) |
| 2134 | abort (); |
| 2135 | |
| 2136 | if (htab->elf.dynamic_sections_created) |
| 2137 | { |
| 2138 | /* Set the contents of the .interp section to the interpreter. */ |
| 2139 | if (info->executable) |
| 2140 | { |
| 2141 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 2142 | if (s == NULL) |
| 2143 | abort (); |
| 2144 | s->size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 2145 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 2146 | } |
| 2147 | } |
| 2148 | |
| 2149 | /* Set up .got offsets for local syms, and space for local dynamic |
| 2150 | relocs. */ |
| 2151 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 2152 | { |
| 2153 | bfd_signed_vma *local_got; |
| 2154 | bfd_signed_vma *end_local_got; |
| 2155 | char *local_tls_type; |
| 2156 | bfd_vma *local_tlsdesc_gotent; |
| 2157 | bfd_size_type locsymcount; |
| 2158 | Elf_Internal_Shdr *symtab_hdr; |
| 2159 | asection *srel; |
| 2160 | |
| 2161 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| 2162 | continue; |
| 2163 | |
| 2164 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 2165 | { |
| 2166 | struct elf_i386_dyn_relocs *p; |
| 2167 | |
| 2168 | for (p = ((struct elf_i386_dyn_relocs *) |
| 2169 | elf_section_data (s)->local_dynrel); |
| 2170 | p != NULL; |
| 2171 | p = p->next) |
| 2172 | { |
| 2173 | if (!bfd_is_abs_section (p->sec) |
| 2174 | && bfd_is_abs_section (p->sec->output_section)) |
| 2175 | { |
| 2176 | /* Input section has been discarded, either because |
| 2177 | it is a copy of a linkonce section or due to |
| 2178 | linker script /DISCARD/, so we'll be discarding |
| 2179 | the relocs too. */ |
| 2180 | } |
| 2181 | else if (p->count != 0) |
| 2182 | { |
| 2183 | srel = elf_section_data (p->sec)->sreloc; |
| 2184 | srel->size += p->count * sizeof (Elf32_External_Rel); |
| 2185 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) |
| 2186 | info->flags |= DF_TEXTREL; |
| 2187 | } |
| 2188 | } |
| 2189 | } |
| 2190 | |
| 2191 | local_got = elf_local_got_refcounts (ibfd); |
| 2192 | if (!local_got) |
| 2193 | continue; |
| 2194 | |
| 2195 | symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; |
| 2196 | locsymcount = symtab_hdr->sh_info; |
| 2197 | end_local_got = local_got + locsymcount; |
| 2198 | local_tls_type = elf_i386_local_got_tls_type (ibfd); |
| 2199 | local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd); |
| 2200 | s = htab->sgot; |
| 2201 | srel = htab->srelgot; |
| 2202 | for (; local_got < end_local_got; |
| 2203 | ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) |
| 2204 | { |
| 2205 | *local_tlsdesc_gotent = (bfd_vma) -1; |
| 2206 | if (*local_got > 0) |
| 2207 | { |
| 2208 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 2209 | { |
| 2210 | *local_tlsdesc_gotent = htab->sgotplt->size |
| 2211 | - elf_i386_compute_jump_table_size (htab); |
| 2212 | htab->sgotplt->size += 8; |
| 2213 | *local_got = (bfd_vma) -2; |
| 2214 | } |
| 2215 | if (! GOT_TLS_GDESC_P (*local_tls_type) |
| 2216 | || GOT_TLS_GD_P (*local_tls_type)) |
| 2217 | { |
| 2218 | *local_got = s->size; |
| 2219 | s->size += 4; |
| 2220 | if (GOT_TLS_GD_P (*local_tls_type) |
| 2221 | || *local_tls_type == GOT_TLS_IE_BOTH) |
| 2222 | s->size += 4; |
| 2223 | } |
| 2224 | if (info->shared |
| 2225 | || GOT_TLS_GD_ANY_P (*local_tls_type) |
| 2226 | || (*local_tls_type & GOT_TLS_IE)) |
| 2227 | { |
| 2228 | if (*local_tls_type == GOT_TLS_IE_BOTH) |
| 2229 | srel->size += 2 * sizeof (Elf32_External_Rel); |
| 2230 | else if (GOT_TLS_GD_P (*local_tls_type) |
| 2231 | || ! GOT_TLS_GDESC_P (*local_tls_type)) |
| 2232 | srel->size += sizeof (Elf32_External_Rel); |
| 2233 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 2234 | htab->srelplt->size += sizeof (Elf32_External_Rel); |
| 2235 | } |
| 2236 | } |
| 2237 | else |
| 2238 | *local_got = (bfd_vma) -1; |
| 2239 | } |
| 2240 | } |
| 2241 | |
| 2242 | if (htab->tls_ldm_got.refcount > 0) |
| 2243 | { |
| 2244 | /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM |
| 2245 | relocs. */ |
| 2246 | htab->tls_ldm_got.offset = htab->sgot->size; |
| 2247 | htab->sgot->size += 8; |
| 2248 | htab->srelgot->size += sizeof (Elf32_External_Rel); |
| 2249 | } |
| 2250 | else |
| 2251 | htab->tls_ldm_got.offset = -1; |
| 2252 | |
| 2253 | /* Allocate global sym .plt and .got entries, and space for global |
| 2254 | sym dynamic relocs. */ |
| 2255 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); |
| 2256 | |
| 2257 | /* For every jump slot reserved in the sgotplt, reloc_count is |
| 2258 | incremented. However, when we reserve space for TLS descriptors, |
| 2259 | it's not incremented, so in order to compute the space reserved |
| 2260 | for them, it suffices to multiply the reloc count by the jump |
| 2261 | slot size. */ |
| 2262 | if (htab->srelplt) |
| 2263 | htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4; |
| 2264 | |
| 2265 | /* We now have determined the sizes of the various dynamic sections. |
| 2266 | Allocate memory for them. */ |
| 2267 | relocs = FALSE; |
| 2268 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 2269 | { |
| 2270 | bfd_boolean strip_section = TRUE; |
| 2271 | |
| 2272 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 2273 | continue; |
| 2274 | |
| 2275 | if (s == htab->splt |
| 2276 | || s == htab->sgot |
| 2277 | || s == htab->sgotplt |
| 2278 | || s == htab->sdynbss) |
| 2279 | { |
| 2280 | /* Strip this section if we don't need it; see the |
| 2281 | comment below. */ |
| 2282 | /* We'd like to strip these sections if they aren't needed, but if |
| 2283 | we've exported dynamic symbols from them we must leave them. |
| 2284 | It's too late to tell BFD to get rid of the symbols. */ |
| 2285 | |
| 2286 | if (htab->elf.hplt != NULL) |
| 2287 | strip_section = FALSE; |
| 2288 | } |
| 2289 | else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel")) |
| 2290 | { |
| 2291 | if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2) |
| 2292 | relocs = TRUE; |
| 2293 | |
| 2294 | /* We use the reloc_count field as a counter if we need |
| 2295 | to copy relocs into the output file. */ |
| 2296 | s->reloc_count = 0; |
| 2297 | } |
| 2298 | else |
| 2299 | { |
| 2300 | /* It's not one of our sections, so don't allocate space. */ |
| 2301 | continue; |
| 2302 | } |
| 2303 | |
| 2304 | if (s->size == 0) |
| 2305 | { |
| 2306 | /* If we don't need this section, strip it from the |
| 2307 | output file. This is mostly to handle .rel.bss and |
| 2308 | .rel.plt. We must create both sections in |
| 2309 | create_dynamic_sections, because they must be created |
| 2310 | before the linker maps input sections to output |
| 2311 | sections. The linker does that before |
| 2312 | adjust_dynamic_symbol is called, and it is that |
| 2313 | function which decides whether anything needs to go |
| 2314 | into these sections. */ |
| 2315 | if (strip_section) |
| 2316 | s->flags |= SEC_EXCLUDE; |
| 2317 | continue; |
| 2318 | } |
| 2319 | |
| 2320 | if ((s->flags & SEC_HAS_CONTENTS) == 0) |
| 2321 | continue; |
| 2322 | |
| 2323 | /* Allocate memory for the section contents. We use bfd_zalloc |
| 2324 | here in case unused entries are not reclaimed before the |
| 2325 | section's contents are written out. This should not happen, |
| 2326 | but this way if it does, we get a R_386_NONE reloc instead |
| 2327 | of garbage. */ |
| 2328 | s->contents = bfd_zalloc (dynobj, s->size); |
| 2329 | if (s->contents == NULL) |
| 2330 | return FALSE; |
| 2331 | } |
| 2332 | |
| 2333 | if (htab->elf.dynamic_sections_created) |
| 2334 | { |
| 2335 | /* Add some entries to the .dynamic section. We fill in the |
| 2336 | values later, in elf_i386_finish_dynamic_sections, but we |
| 2337 | must add the entries now so that we get the correct size for |
| 2338 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 2339 | dynamic linker and used by the debugger. */ |
| 2340 | #define add_dynamic_entry(TAG, VAL) \ |
| 2341 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| 2342 | |
| 2343 | if (info->executable) |
| 2344 | { |
| 2345 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 2346 | return FALSE; |
| 2347 | } |
| 2348 | |
| 2349 | if (htab->splt->size != 0) |
| 2350 | { |
| 2351 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 2352 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 2353 | || !add_dynamic_entry (DT_PLTREL, DT_REL) |
| 2354 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 2355 | return FALSE; |
| 2356 | } |
| 2357 | |
| 2358 | if (relocs) |
| 2359 | { |
| 2360 | if (!add_dynamic_entry (DT_REL, 0) |
| 2361 | || !add_dynamic_entry (DT_RELSZ, 0) |
| 2362 | || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) |
| 2363 | return FALSE; |
| 2364 | |
| 2365 | /* If any dynamic relocs apply to a read-only section, |
| 2366 | then we need a DT_TEXTREL entry. */ |
| 2367 | if ((info->flags & DF_TEXTREL) == 0) |
| 2368 | elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, |
| 2369 | (PTR) info); |
| 2370 | |
| 2371 | if ((info->flags & DF_TEXTREL) != 0) |
| 2372 | { |
| 2373 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 2374 | return FALSE; |
| 2375 | } |
| 2376 | } |
| 2377 | } |
| 2378 | #undef add_dynamic_entry |
| 2379 | |
| 2380 | return TRUE; |
| 2381 | } |
| 2382 | |
| 2383 | static bfd_boolean |
| 2384 | elf_i386_always_size_sections (bfd *output_bfd, |
| 2385 | struct bfd_link_info *info) |
| 2386 | { |
| 2387 | asection *tls_sec = elf_hash_table (info)->tls_sec; |
| 2388 | |
| 2389 | if (tls_sec) |
| 2390 | { |
| 2391 | struct elf_link_hash_entry *tlsbase; |
| 2392 | |
| 2393 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), |
| 2394 | "_TLS_MODULE_BASE_", |
| 2395 | FALSE, FALSE, FALSE); |
| 2396 | |
| 2397 | if (tlsbase && tlsbase->type == STT_TLS) |
| 2398 | { |
| 2399 | struct bfd_link_hash_entry *bh = NULL; |
| 2400 | const struct elf_backend_data *bed |
| 2401 | = get_elf_backend_data (output_bfd); |
| 2402 | |
| 2403 | if (!(_bfd_generic_link_add_one_symbol |
| 2404 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, |
| 2405 | tls_sec, 0, NULL, FALSE, |
| 2406 | bed->collect, &bh))) |
| 2407 | return FALSE; |
| 2408 | tlsbase = (struct elf_link_hash_entry *)bh; |
| 2409 | tlsbase->def_regular = 1; |
| 2410 | tlsbase->other = STV_HIDDEN; |
| 2411 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); |
| 2412 | } |
| 2413 | } |
| 2414 | |
| 2415 | return TRUE; |
| 2416 | } |
| 2417 | |
| 2418 | /* Set the correct type for an x86 ELF section. We do this by the |
| 2419 | section name, which is a hack, but ought to work. */ |
| 2420 | |
| 2421 | static bfd_boolean |
| 2422 | elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, |
| 2423 | Elf_Internal_Shdr *hdr, |
| 2424 | asection *sec) |
| 2425 | { |
| 2426 | register const char *name; |
| 2427 | |
| 2428 | name = bfd_get_section_name (abfd, sec); |
| 2429 | |
| 2430 | /* This is an ugly, but unfortunately necessary hack that is |
| 2431 | needed when producing EFI binaries on x86. It tells |
| 2432 | elf.c:elf_fake_sections() not to consider ".reloc" as a section |
| 2433 | containing ELF relocation info. We need this hack in order to |
| 2434 | be able to generate ELF binaries that can be translated into |
| 2435 | EFI applications (which are essentially COFF objects). Those |
| 2436 | files contain a COFF ".reloc" section inside an ELFNN object, |
| 2437 | which would normally cause BFD to segfault because it would |
| 2438 | attempt to interpret this section as containing relocation |
| 2439 | entries for section "oc". With this hack enabled, ".reloc" |
| 2440 | will be treated as a normal data section, which will avoid the |
| 2441 | segfault. However, you won't be able to create an ELFNN binary |
| 2442 | with a section named "oc" that needs relocations, but that's |
| 2443 | the kind of ugly side-effects you get when detecting section |
| 2444 | types based on their names... In practice, this limitation is |
| 2445 | unlikely to bite. */ |
| 2446 | if (strcmp (name, ".reloc") == 0) |
| 2447 | hdr->sh_type = SHT_PROGBITS; |
| 2448 | |
| 2449 | return TRUE; |
| 2450 | } |
| 2451 | |
| 2452 | /* Return the base VMA address which should be subtracted from real addresses |
| 2453 | when resolving @dtpoff relocation. |
| 2454 | This is PT_TLS segment p_vaddr. */ |
| 2455 | |
| 2456 | static bfd_vma |
| 2457 | dtpoff_base (struct bfd_link_info *info) |
| 2458 | { |
| 2459 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 2460 | if (elf_hash_table (info)->tls_sec == NULL) |
| 2461 | return 0; |
| 2462 | return elf_hash_table (info)->tls_sec->vma; |
| 2463 | } |
| 2464 | |
| 2465 | /* Return the relocation value for @tpoff relocation |
| 2466 | if STT_TLS virtual address is ADDRESS. */ |
| 2467 | |
| 2468 | static bfd_vma |
| 2469 | tpoff (struct bfd_link_info *info, bfd_vma address) |
| 2470 | { |
| 2471 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 2472 | |
| 2473 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 2474 | if (htab->tls_sec == NULL) |
| 2475 | return 0; |
| 2476 | return htab->tls_size + htab->tls_sec->vma - address; |
| 2477 | } |
| 2478 | |
| 2479 | /* Relocate an i386 ELF section. */ |
| 2480 | |
| 2481 | static bfd_boolean |
| 2482 | elf_i386_relocate_section (bfd *output_bfd, |
| 2483 | struct bfd_link_info *info, |
| 2484 | bfd *input_bfd, |
| 2485 | asection *input_section, |
| 2486 | bfd_byte *contents, |
| 2487 | Elf_Internal_Rela *relocs, |
| 2488 | Elf_Internal_Sym *local_syms, |
| 2489 | asection **local_sections) |
| 2490 | { |
| 2491 | struct elf_i386_link_hash_table *htab; |
| 2492 | Elf_Internal_Shdr *symtab_hdr; |
| 2493 | struct elf_link_hash_entry **sym_hashes; |
| 2494 | bfd_vma *local_got_offsets; |
| 2495 | bfd_vma *local_tlsdesc_gotents; |
| 2496 | Elf_Internal_Rela *rel; |
| 2497 | Elf_Internal_Rela *relend; |
| 2498 | |
| 2499 | htab = elf_i386_hash_table (info); |
| 2500 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 2501 | sym_hashes = elf_sym_hashes (input_bfd); |
| 2502 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 2503 | local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd); |
| 2504 | |
| 2505 | rel = relocs; |
| 2506 | relend = relocs + input_section->reloc_count; |
| 2507 | for (; rel < relend; rel++) |
| 2508 | { |
| 2509 | unsigned int r_type; |
| 2510 | reloc_howto_type *howto; |
| 2511 | unsigned long r_symndx; |
| 2512 | struct elf_link_hash_entry *h; |
| 2513 | Elf_Internal_Sym *sym; |
| 2514 | asection *sec; |
| 2515 | bfd_vma off, offplt; |
| 2516 | bfd_vma relocation; |
| 2517 | bfd_boolean unresolved_reloc; |
| 2518 | bfd_reloc_status_type r; |
| 2519 | unsigned int indx; |
| 2520 | int tls_type; |
| 2521 | |
| 2522 | r_type = ELF32_R_TYPE (rel->r_info); |
| 2523 | if (r_type == R_386_GNU_VTINHERIT |
| 2524 | || r_type == R_386_GNU_VTENTRY) |
| 2525 | continue; |
| 2526 | |
| 2527 | if ((indx = r_type) >= R_386_standard |
| 2528 | && ((indx = r_type - R_386_ext_offset) - R_386_standard |
| 2529 | >= R_386_ext - R_386_standard) |
| 2530 | && ((indx = r_type - R_386_tls_offset) - R_386_ext |
| 2531 | >= R_386_tls - R_386_ext)) |
| 2532 | { |
| 2533 | (*_bfd_error_handler) |
| 2534 | (_("%B: unrecognized relocation (0x%x) in section `%A'"), |
| 2535 | input_bfd, input_section, r_type); |
| 2536 | bfd_set_error (bfd_error_bad_value); |
| 2537 | return FALSE; |
| 2538 | } |
| 2539 | howto = elf_howto_table + indx; |
| 2540 | |
| 2541 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2542 | h = NULL; |
| 2543 | sym = NULL; |
| 2544 | sec = NULL; |
| 2545 | unresolved_reloc = FALSE; |
| 2546 | if (r_symndx < symtab_hdr->sh_info) |
| 2547 | { |
| 2548 | sym = local_syms + r_symndx; |
| 2549 | sec = local_sections[r_symndx]; |
| 2550 | relocation = (sec->output_section->vma |
| 2551 | + sec->output_offset |
| 2552 | + sym->st_value); |
| 2553 | |
| 2554 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION |
| 2555 | && ((sec->flags & SEC_MERGE) != 0 |
| 2556 | || (info->relocatable |
| 2557 | && sec->output_offset != 0))) |
| 2558 | { |
| 2559 | bfd_vma addend; |
| 2560 | bfd_byte *where = contents + rel->r_offset; |
| 2561 | |
| 2562 | switch (howto->size) |
| 2563 | { |
| 2564 | case 0: |
| 2565 | addend = bfd_get_8 (input_bfd, where); |
| 2566 | if (howto->pc_relative) |
| 2567 | { |
| 2568 | addend = (addend ^ 0x80) - 0x80; |
| 2569 | addend += 1; |
| 2570 | } |
| 2571 | break; |
| 2572 | case 1: |
| 2573 | addend = bfd_get_16 (input_bfd, where); |
| 2574 | if (howto->pc_relative) |
| 2575 | { |
| 2576 | addend = (addend ^ 0x8000) - 0x8000; |
| 2577 | addend += 2; |
| 2578 | } |
| 2579 | break; |
| 2580 | case 2: |
| 2581 | addend = bfd_get_32 (input_bfd, where); |
| 2582 | if (howto->pc_relative) |
| 2583 | { |
| 2584 | addend = (addend ^ 0x80000000) - 0x80000000; |
| 2585 | addend += 4; |
| 2586 | } |
| 2587 | break; |
| 2588 | default: |
| 2589 | abort (); |
| 2590 | } |
| 2591 | |
| 2592 | if (info->relocatable) |
| 2593 | addend += sec->output_offset; |
| 2594 | else |
| 2595 | { |
| 2596 | asection *msec = sec; |
| 2597 | addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, |
| 2598 | addend); |
| 2599 | addend -= relocation; |
| 2600 | addend += msec->output_section->vma + msec->output_offset; |
| 2601 | } |
| 2602 | |
| 2603 | switch (howto->size) |
| 2604 | { |
| 2605 | case 0: |
| 2606 | /* FIXME: overflow checks. */ |
| 2607 | if (howto->pc_relative) |
| 2608 | addend -= 1; |
| 2609 | bfd_put_8 (input_bfd, addend, where); |
| 2610 | break; |
| 2611 | case 1: |
| 2612 | if (howto->pc_relative) |
| 2613 | addend -= 2; |
| 2614 | bfd_put_16 (input_bfd, addend, where); |
| 2615 | break; |
| 2616 | case 2: |
| 2617 | if (howto->pc_relative) |
| 2618 | addend -= 4; |
| 2619 | bfd_put_32 (input_bfd, addend, where); |
| 2620 | break; |
| 2621 | } |
| 2622 | } |
| 2623 | } |
| 2624 | else |
| 2625 | { |
| 2626 | bfd_boolean warned; |
| 2627 | |
| 2628 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 2629 | r_symndx, symtab_hdr, sym_hashes, |
| 2630 | h, sec, relocation, |
| 2631 | unresolved_reloc, warned); |
| 2632 | } |
| 2633 | |
| 2634 | if (sec != NULL && elf_discarded_section (sec)) |
| 2635 | { |
| 2636 | /* For relocs against symbols from removed linkonce sections, |
| 2637 | or sections discarded by a linker script, we just want the |
| 2638 | section contents zeroed. Avoid any special processing. */ |
| 2639 | _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); |
| 2640 | rel->r_info = 0; |
| 2641 | rel->r_addend = 0; |
| 2642 | continue; |
| 2643 | } |
| 2644 | |
| 2645 | if (info->relocatable) |
| 2646 | continue; |
| 2647 | |
| 2648 | switch (r_type) |
| 2649 | { |
| 2650 | case R_386_GOT32: |
| 2651 | /* Relocation is to the entry for this symbol in the global |
| 2652 | offset table. */ |
| 2653 | if (htab->sgot == NULL) |
| 2654 | abort (); |
| 2655 | |
| 2656 | if (h != NULL) |
| 2657 | { |
| 2658 | bfd_boolean dyn; |
| 2659 | |
| 2660 | off = h->got.offset; |
| 2661 | dyn = htab->elf.dynamic_sections_created; |
| 2662 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| 2663 | || (info->shared |
| 2664 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 2665 | || (ELF_ST_VISIBILITY (h->other) |
| 2666 | && h->root.type == bfd_link_hash_undefweak)) |
| 2667 | { |
| 2668 | /* This is actually a static link, or it is a |
| 2669 | -Bsymbolic link and the symbol is defined |
| 2670 | locally, or the symbol was forced to be local |
| 2671 | because of a version file. We must initialize |
| 2672 | this entry in the global offset table. Since the |
| 2673 | offset must always be a multiple of 4, we use the |
| 2674 | least significant bit to record whether we have |
| 2675 | initialized it already. |
| 2676 | |
| 2677 | When doing a dynamic link, we create a .rel.got |
| 2678 | relocation entry to initialize the value. This |
| 2679 | is done in the finish_dynamic_symbol routine. */ |
| 2680 | if ((off & 1) != 0) |
| 2681 | off &= ~1; |
| 2682 | else |
| 2683 | { |
| 2684 | bfd_put_32 (output_bfd, relocation, |
| 2685 | htab->sgot->contents + off); |
| 2686 | h->got.offset |= 1; |
| 2687 | } |
| 2688 | } |
| 2689 | else |
| 2690 | unresolved_reloc = FALSE; |
| 2691 | } |
| 2692 | else |
| 2693 | { |
| 2694 | if (local_got_offsets == NULL) |
| 2695 | abort (); |
| 2696 | |
| 2697 | off = local_got_offsets[r_symndx]; |
| 2698 | |
| 2699 | /* The offset must always be a multiple of 4. We use |
| 2700 | the least significant bit to record whether we have |
| 2701 | already generated the necessary reloc. */ |
| 2702 | if ((off & 1) != 0) |
| 2703 | off &= ~1; |
| 2704 | else |
| 2705 | { |
| 2706 | bfd_put_32 (output_bfd, relocation, |
| 2707 | htab->sgot->contents + off); |
| 2708 | |
| 2709 | if (info->shared) |
| 2710 | { |
| 2711 | asection *s; |
| 2712 | Elf_Internal_Rela outrel; |
| 2713 | bfd_byte *loc; |
| 2714 | |
| 2715 | s = htab->srelgot; |
| 2716 | if (s == NULL) |
| 2717 | abort (); |
| 2718 | |
| 2719 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2720 | + htab->sgot->output_offset |
| 2721 | + off); |
| 2722 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2723 | loc = s->contents; |
| 2724 | loc += s->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2725 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2726 | } |
| 2727 | |
| 2728 | local_got_offsets[r_symndx] |= 1; |
| 2729 | } |
| 2730 | } |
| 2731 | |
| 2732 | if (off >= (bfd_vma) -2) |
| 2733 | abort (); |
| 2734 | |
| 2735 | relocation = htab->sgot->output_section->vma |
| 2736 | + htab->sgot->output_offset + off |
| 2737 | - htab->sgotplt->output_section->vma |
| 2738 | - htab->sgotplt->output_offset; |
| 2739 | break; |
| 2740 | |
| 2741 | case R_386_GOTOFF: |
| 2742 | /* Relocation is relative to the start of the global offset |
| 2743 | table. */ |
| 2744 | |
| 2745 | /* Check to make sure it isn't a protected function symbol |
| 2746 | for shared library since it may not be local when used |
| 2747 | as function address. */ |
| 2748 | if (info->shared |
| 2749 | && !info->executable |
| 2750 | && h |
| 2751 | && h->def_regular |
| 2752 | && h->type == STT_FUNC |
| 2753 | && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 2754 | { |
| 2755 | (*_bfd_error_handler) |
| 2756 | (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"), |
| 2757 | input_bfd, h->root.root.string); |
| 2758 | bfd_set_error (bfd_error_bad_value); |
| 2759 | return FALSE; |
| 2760 | } |
| 2761 | |
| 2762 | /* Note that sgot is not involved in this |
| 2763 | calculation. We always want the start of .got.plt. If we |
| 2764 | defined _GLOBAL_OFFSET_TABLE_ in a different way, as is |
| 2765 | permitted by the ABI, we might have to change this |
| 2766 | calculation. */ |
| 2767 | relocation -= htab->sgotplt->output_section->vma |
| 2768 | + htab->sgotplt->output_offset; |
| 2769 | break; |
| 2770 | |
| 2771 | case R_386_GOTPC: |
| 2772 | /* Use global offset table as symbol value. */ |
| 2773 | relocation = htab->sgotplt->output_section->vma |
| 2774 | + htab->sgotplt->output_offset; |
| 2775 | unresolved_reloc = FALSE; |
| 2776 | break; |
| 2777 | |
| 2778 | case R_386_PLT32: |
| 2779 | /* Relocation is to the entry for this symbol in the |
| 2780 | procedure linkage table. */ |
| 2781 | |
| 2782 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 2783 | without using the procedure linkage table. */ |
| 2784 | if (h == NULL) |
| 2785 | break; |
| 2786 | |
| 2787 | if (h->plt.offset == (bfd_vma) -1 |
| 2788 | || htab->splt == NULL) |
| 2789 | { |
| 2790 | /* We didn't make a PLT entry for this symbol. This |
| 2791 | happens when statically linking PIC code, or when |
| 2792 | using -Bsymbolic. */ |
| 2793 | break; |
| 2794 | } |
| 2795 | |
| 2796 | relocation = (htab->splt->output_section->vma |
| 2797 | + htab->splt->output_offset |
| 2798 | + h->plt.offset); |
| 2799 | unresolved_reloc = FALSE; |
| 2800 | break; |
| 2801 | |
| 2802 | case R_386_32: |
| 2803 | case R_386_PC32: |
| 2804 | if ((input_section->flags & SEC_ALLOC) == 0) |
| 2805 | break; |
| 2806 | |
| 2807 | if ((info->shared |
| 2808 | && (h == NULL |
| 2809 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2810 | || h->root.type != bfd_link_hash_undefweak) |
| 2811 | && (r_type != R_386_PC32 |
| 2812 | || !SYMBOL_CALLS_LOCAL (info, h))) |
| 2813 | || (ELIMINATE_COPY_RELOCS |
| 2814 | && !info->shared |
| 2815 | && h != NULL |
| 2816 | && h->dynindx != -1 |
| 2817 | && !h->non_got_ref |
| 2818 | && ((h->def_dynamic |
| 2819 | && !h->def_regular) |
| 2820 | || h->root.type == bfd_link_hash_undefweak |
| 2821 | || h->root.type == bfd_link_hash_undefined))) |
| 2822 | { |
| 2823 | Elf_Internal_Rela outrel; |
| 2824 | bfd_byte *loc; |
| 2825 | bfd_boolean skip, relocate; |
| 2826 | asection *sreloc; |
| 2827 | |
| 2828 | /* When generating a shared object, these relocations |
| 2829 | are copied into the output file to be resolved at run |
| 2830 | time. */ |
| 2831 | |
| 2832 | skip = FALSE; |
| 2833 | relocate = FALSE; |
| 2834 | |
| 2835 | outrel.r_offset = |
| 2836 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 2837 | rel->r_offset); |
| 2838 | if (outrel.r_offset == (bfd_vma) -1) |
| 2839 | skip = TRUE; |
| 2840 | else if (outrel.r_offset == (bfd_vma) -2) |
| 2841 | skip = TRUE, relocate = TRUE; |
| 2842 | outrel.r_offset += (input_section->output_section->vma |
| 2843 | + input_section->output_offset); |
| 2844 | |
| 2845 | if (skip) |
| 2846 | memset (&outrel, 0, sizeof outrel); |
| 2847 | else if (h != NULL |
| 2848 | && h->dynindx != -1 |
| 2849 | && (r_type == R_386_PC32 |
| 2850 | || !info->shared |
| 2851 | || !SYMBOLIC_BIND (info, h) |
| 2852 | || !h->def_regular)) |
| 2853 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 2854 | else |
| 2855 | { |
| 2856 | /* This symbol is local, or marked to become local. */ |
| 2857 | relocate = TRUE; |
| 2858 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2859 | } |
| 2860 | |
| 2861 | sreloc = elf_section_data (input_section)->sreloc; |
| 2862 | if (sreloc == NULL) |
| 2863 | abort (); |
| 2864 | |
| 2865 | loc = sreloc->contents; |
| 2866 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2867 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2868 | |
| 2869 | /* If this reloc is against an external symbol, we do |
| 2870 | not want to fiddle with the addend. Otherwise, we |
| 2871 | need to include the symbol value so that it becomes |
| 2872 | an addend for the dynamic reloc. */ |
| 2873 | if (! relocate) |
| 2874 | continue; |
| 2875 | } |
| 2876 | break; |
| 2877 | |
| 2878 | case R_386_TLS_IE: |
| 2879 | if (info->shared) |
| 2880 | { |
| 2881 | Elf_Internal_Rela outrel; |
| 2882 | bfd_byte *loc; |
| 2883 | asection *sreloc; |
| 2884 | |
| 2885 | outrel.r_offset = rel->r_offset |
| 2886 | + input_section->output_section->vma |
| 2887 | + input_section->output_offset; |
| 2888 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2889 | sreloc = elf_section_data (input_section)->sreloc; |
| 2890 | if (sreloc == NULL) |
| 2891 | abort (); |
| 2892 | loc = sreloc->contents; |
| 2893 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 2894 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 2895 | } |
| 2896 | /* Fall through */ |
| 2897 | |
| 2898 | case R_386_TLS_GD: |
| 2899 | case R_386_TLS_GOTDESC: |
| 2900 | case R_386_TLS_DESC_CALL: |
| 2901 | case R_386_TLS_IE_32: |
| 2902 | case R_386_TLS_GOTIE: |
| 2903 | tls_type = GOT_UNKNOWN; |
| 2904 | if (h == NULL && local_got_offsets) |
| 2905 | tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx]; |
| 2906 | else if (h != NULL) |
| 2907 | tls_type = elf_i386_hash_entry(h)->tls_type; |
| 2908 | if (tls_type == GOT_TLS_IE) |
| 2909 | tls_type = GOT_TLS_IE_NEG; |
| 2910 | |
| 2911 | if (! elf_i386_tls_transition (info, input_bfd, |
| 2912 | input_section, contents, |
| 2913 | symtab_hdr, sym_hashes, |
| 2914 | &r_type, tls_type, rel, |
| 2915 | relend, h)) |
| 2916 | return FALSE; |
| 2917 | |
| 2918 | if (r_type == R_386_TLS_LE_32) |
| 2919 | { |
| 2920 | BFD_ASSERT (! unresolved_reloc); |
| 2921 | if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) |
| 2922 | { |
| 2923 | unsigned int type; |
| 2924 | bfd_vma roff; |
| 2925 | |
| 2926 | /* GD->LE transition. */ |
| 2927 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2928 | if (type == 0x04) |
| 2929 | { |
| 2930 | /* leal foo(,%reg,1), %eax; call ___tls_get_addr |
| 2931 | Change it into: |
| 2932 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2933 | (6 byte form of subl). */ |
| 2934 | memcpy (contents + rel->r_offset - 3, |
| 2935 | "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
| 2936 | roff = rel->r_offset + 5; |
| 2937 | } |
| 2938 | else |
| 2939 | { |
| 2940 | /* leal foo(%reg), %eax; call ___tls_get_addr; nop |
| 2941 | Change it into: |
| 2942 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2943 | (6 byte form of subl). */ |
| 2944 | memcpy (contents + rel->r_offset - 2, |
| 2945 | "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
| 2946 | roff = rel->r_offset + 6; |
| 2947 | } |
| 2948 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2949 | contents + roff); |
| 2950 | /* Skip R_386_PC32/R_386_PLT32. */ |
| 2951 | rel++; |
| 2952 | continue; |
| 2953 | } |
| 2954 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) |
| 2955 | { |
| 2956 | /* GDesc -> LE transition. |
| 2957 | It's originally something like: |
| 2958 | leal x@tlsdesc(%ebx), %eax |
| 2959 | |
| 2960 | leal x@ntpoff, %eax |
| 2961 | |
| 2962 | Registers other than %eax may be set up here. */ |
| 2963 | |
| 2964 | unsigned int val; |
| 2965 | bfd_vma roff; |
| 2966 | |
| 2967 | roff = rel->r_offset; |
| 2968 | val = bfd_get_8 (input_bfd, contents + roff - 1); |
| 2969 | |
| 2970 | /* Now modify the instruction as appropriate. */ |
| 2971 | /* aoliva FIXME: remove the above and xor the byte |
| 2972 | below with 0x86. */ |
| 2973 | bfd_put_8 (output_bfd, val ^ 0x86, |
| 2974 | contents + roff - 1); |
| 2975 | bfd_put_32 (output_bfd, -tpoff (info, relocation), |
| 2976 | contents + roff); |
| 2977 | continue; |
| 2978 | } |
| 2979 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) |
| 2980 | { |
| 2981 | /* GDesc -> LE transition. |
| 2982 | It's originally: |
| 2983 | call *(%eax) |
| 2984 | Turn it into: |
| 2985 | xchg %ax,%ax */ |
| 2986 | |
| 2987 | bfd_vma roff; |
| 2988 | |
| 2989 | roff = rel->r_offset; |
| 2990 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 2991 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 2992 | continue; |
| 2993 | } |
| 2994 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE) |
| 2995 | { |
| 2996 | unsigned int val; |
| 2997 | |
| 2998 | /* IE->LE transition: |
| 2999 | Originally it can be one of: |
| 3000 | movl foo, %eax |
| 3001 | movl foo, %reg |
| 3002 | addl foo, %reg |
| 3003 | We change it into: |
| 3004 | movl $foo, %eax |
| 3005 | movl $foo, %reg |
| 3006 | addl $foo, %reg. */ |
| 3007 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 3008 | if (val == 0xa1) |
| 3009 | { |
| 3010 | /* movl foo, %eax. */ |
| 3011 | bfd_put_8 (output_bfd, 0xb8, |
| 3012 | contents + rel->r_offset - 1); |
| 3013 | } |
| 3014 | else |
| 3015 | { |
| 3016 | unsigned int type; |
| 3017 | |
| 3018 | type = bfd_get_8 (input_bfd, |
| 3019 | contents + rel->r_offset - 2); |
| 3020 | switch (type) |
| 3021 | { |
| 3022 | case 0x8b: |
| 3023 | /* movl */ |
| 3024 | bfd_put_8 (output_bfd, 0xc7, |
| 3025 | contents + rel->r_offset - 2); |
| 3026 | bfd_put_8 (output_bfd, |
| 3027 | 0xc0 | ((val >> 3) & 7), |
| 3028 | contents + rel->r_offset - 1); |
| 3029 | break; |
| 3030 | case 0x03: |
| 3031 | /* addl */ |
| 3032 | bfd_put_8 (output_bfd, 0x81, |
| 3033 | contents + rel->r_offset - 2); |
| 3034 | bfd_put_8 (output_bfd, |
| 3035 | 0xc0 | ((val >> 3) & 7), |
| 3036 | contents + rel->r_offset - 1); |
| 3037 | break; |
| 3038 | default: |
| 3039 | BFD_FAIL (); |
| 3040 | break; |
| 3041 | } |
| 3042 | } |
| 3043 | bfd_put_32 (output_bfd, -tpoff (info, relocation), |
| 3044 | contents + rel->r_offset); |
| 3045 | continue; |
| 3046 | } |
| 3047 | else |
| 3048 | { |
| 3049 | unsigned int val, type; |
| 3050 | |
| 3051 | /* {IE_32,GOTIE}->LE transition: |
| 3052 | Originally it can be one of: |
| 3053 | subl foo(%reg1), %reg2 |
| 3054 | movl foo(%reg1), %reg2 |
| 3055 | addl foo(%reg1), %reg2 |
| 3056 | We change it into: |
| 3057 | subl $foo, %reg2 |
| 3058 | movl $foo, %reg2 (6 byte form) |
| 3059 | addl $foo, %reg2. */ |
| 3060 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 3061 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 3062 | if (type == 0x8b) |
| 3063 | { |
| 3064 | /* movl */ |
| 3065 | bfd_put_8 (output_bfd, 0xc7, |
| 3066 | contents + rel->r_offset - 2); |
| 3067 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 3068 | contents + rel->r_offset - 1); |
| 3069 | } |
| 3070 | else if (type == 0x2b) |
| 3071 | { |
| 3072 | /* subl */ |
| 3073 | bfd_put_8 (output_bfd, 0x81, |
| 3074 | contents + rel->r_offset - 2); |
| 3075 | bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), |
| 3076 | contents + rel->r_offset - 1); |
| 3077 | } |
| 3078 | else if (type == 0x03) |
| 3079 | { |
| 3080 | /* addl */ |
| 3081 | bfd_put_8 (output_bfd, 0x81, |
| 3082 | contents + rel->r_offset - 2); |
| 3083 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 3084 | contents + rel->r_offset - 1); |
| 3085 | } |
| 3086 | else |
| 3087 | BFD_FAIL (); |
| 3088 | if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE) |
| 3089 | bfd_put_32 (output_bfd, -tpoff (info, relocation), |
| 3090 | contents + rel->r_offset); |
| 3091 | else |
| 3092 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 3093 | contents + rel->r_offset); |
| 3094 | continue; |
| 3095 | } |
| 3096 | } |
| 3097 | |
| 3098 | if (htab->sgot == NULL) |
| 3099 | abort (); |
| 3100 | |
| 3101 | if (h != NULL) |
| 3102 | { |
| 3103 | off = h->got.offset; |
| 3104 | offplt = elf_i386_hash_entry (h)->tlsdesc_got; |
| 3105 | } |
| 3106 | else |
| 3107 | { |
| 3108 | if (local_got_offsets == NULL) |
| 3109 | abort (); |
| 3110 | |
| 3111 | off = local_got_offsets[r_symndx]; |
| 3112 | offplt = local_tlsdesc_gotents[r_symndx]; |
| 3113 | } |
| 3114 | |
| 3115 | if ((off & 1) != 0) |
| 3116 | off &= ~1; |
| 3117 | else |
| 3118 | { |
| 3119 | Elf_Internal_Rela outrel; |
| 3120 | bfd_byte *loc; |
| 3121 | int dr_type, indx; |
| 3122 | asection *sreloc; |
| 3123 | |
| 3124 | if (htab->srelgot == NULL) |
| 3125 | abort (); |
| 3126 | |
| 3127 | indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| 3128 | |
| 3129 | if (GOT_TLS_GDESC_P (tls_type)) |
| 3130 | { |
| 3131 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC); |
| 3132 | BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8 |
| 3133 | <= htab->sgotplt->size); |
| 3134 | outrel.r_offset = (htab->sgotplt->output_section->vma |
| 3135 | + htab->sgotplt->output_offset |
| 3136 | + offplt |
| 3137 | + htab->sgotplt_jump_table_size); |
| 3138 | sreloc = htab->srelplt; |
| 3139 | loc = sreloc->contents; |
| 3140 | loc += (htab->next_tls_desc_index++ |
| 3141 | * sizeof (Elf32_External_Rel)); |
| 3142 | BFD_ASSERT (loc + sizeof (Elf32_External_Rel) |
| 3143 | <= sreloc->contents + sreloc->size); |
| 3144 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3145 | if (indx == 0) |
| 3146 | { |
| 3147 | BFD_ASSERT (! unresolved_reloc); |
| 3148 | bfd_put_32 (output_bfd, |
| 3149 | relocation - dtpoff_base (info), |
| 3150 | htab->sgotplt->contents + offplt |
| 3151 | + htab->sgotplt_jump_table_size + 4); |
| 3152 | } |
| 3153 | else |
| 3154 | { |
| 3155 | bfd_put_32 (output_bfd, 0, |
| 3156 | htab->sgotplt->contents + offplt |
| 3157 | + htab->sgotplt_jump_table_size + 4); |
| 3158 | } |
| 3159 | } |
| 3160 | |
| 3161 | sreloc = htab->srelgot; |
| 3162 | |
| 3163 | outrel.r_offset = (htab->sgot->output_section->vma |
| 3164 | + htab->sgot->output_offset + off); |
| 3165 | |
| 3166 | if (GOT_TLS_GD_P (tls_type)) |
| 3167 | dr_type = R_386_TLS_DTPMOD32; |
| 3168 | else if (GOT_TLS_GDESC_P (tls_type)) |
| 3169 | goto dr_done; |
| 3170 | else if (tls_type == GOT_TLS_IE_POS) |
| 3171 | dr_type = R_386_TLS_TPOFF; |
| 3172 | else |
| 3173 | dr_type = R_386_TLS_TPOFF32; |
| 3174 | |
| 3175 | if (dr_type == R_386_TLS_TPOFF && indx == 0) |
| 3176 | bfd_put_32 (output_bfd, relocation - dtpoff_base (info), |
| 3177 | htab->sgot->contents + off); |
| 3178 | else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) |
| 3179 | bfd_put_32 (output_bfd, dtpoff_base (info) - relocation, |
| 3180 | htab->sgot->contents + off); |
| 3181 | else if (dr_type != R_386_TLS_DESC) |
| 3182 | bfd_put_32 (output_bfd, 0, |
| 3183 | htab->sgot->contents + off); |
| 3184 | outrel.r_info = ELF32_R_INFO (indx, dr_type); |
| 3185 | |
| 3186 | loc = sreloc->contents; |
| 3187 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3188 | BFD_ASSERT (loc + sizeof (Elf32_External_Rel) |
| 3189 | <= sreloc->contents + sreloc->size); |
| 3190 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3191 | |
| 3192 | if (GOT_TLS_GD_P (tls_type)) |
| 3193 | { |
| 3194 | if (indx == 0) |
| 3195 | { |
| 3196 | BFD_ASSERT (! unresolved_reloc); |
| 3197 | bfd_put_32 (output_bfd, |
| 3198 | relocation - dtpoff_base (info), |
| 3199 | htab->sgot->contents + off + 4); |
| 3200 | } |
| 3201 | else |
| 3202 | { |
| 3203 | bfd_put_32 (output_bfd, 0, |
| 3204 | htab->sgot->contents + off + 4); |
| 3205 | outrel.r_info = ELF32_R_INFO (indx, |
| 3206 | R_386_TLS_DTPOFF32); |
| 3207 | outrel.r_offset += 4; |
| 3208 | sreloc->reloc_count++; |
| 3209 | loc += sizeof (Elf32_External_Rel); |
| 3210 | BFD_ASSERT (loc + sizeof (Elf32_External_Rel) |
| 3211 | <= sreloc->contents + sreloc->size); |
| 3212 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3213 | } |
| 3214 | } |
| 3215 | else if (tls_type == GOT_TLS_IE_BOTH) |
| 3216 | { |
| 3217 | bfd_put_32 (output_bfd, |
| 3218 | indx == 0 ? relocation - dtpoff_base (info) : 0, |
| 3219 | htab->sgot->contents + off + 4); |
| 3220 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); |
| 3221 | outrel.r_offset += 4; |
| 3222 | sreloc->reloc_count++; |
| 3223 | loc += sizeof (Elf32_External_Rel); |
| 3224 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3225 | } |
| 3226 | |
| 3227 | dr_done: |
| 3228 | if (h != NULL) |
| 3229 | h->got.offset |= 1; |
| 3230 | else |
| 3231 | local_got_offsets[r_symndx] |= 1; |
| 3232 | } |
| 3233 | |
| 3234 | if (off >= (bfd_vma) -2 |
| 3235 | && ! GOT_TLS_GDESC_P (tls_type)) |
| 3236 | abort (); |
| 3237 | if (r_type == R_386_TLS_GOTDESC |
| 3238 | || r_type == R_386_TLS_DESC_CALL) |
| 3239 | { |
| 3240 | relocation = htab->sgotplt_jump_table_size + offplt; |
| 3241 | unresolved_reloc = FALSE; |
| 3242 | } |
| 3243 | else if (r_type == ELF32_R_TYPE (rel->r_info)) |
| 3244 | { |
| 3245 | bfd_vma g_o_t = htab->sgotplt->output_section->vma |
| 3246 | + htab->sgotplt->output_offset; |
| 3247 | relocation = htab->sgot->output_section->vma |
| 3248 | + htab->sgot->output_offset + off - g_o_t; |
| 3249 | if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) |
| 3250 | && tls_type == GOT_TLS_IE_BOTH) |
| 3251 | relocation += 4; |
| 3252 | if (r_type == R_386_TLS_IE) |
| 3253 | relocation += g_o_t; |
| 3254 | unresolved_reloc = FALSE; |
| 3255 | } |
| 3256 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) |
| 3257 | { |
| 3258 | unsigned int val, type; |
| 3259 | bfd_vma roff; |
| 3260 | |
| 3261 | /* GD->IE transition. */ |
| 3262 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 3263 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 3264 | if (type == 0x04) |
| 3265 | { |
| 3266 | /* leal foo(,%reg,1), %eax; call ___tls_get_addr |
| 3267 | Change it into: |
| 3268 | movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ |
| 3269 | val >>= 3; |
| 3270 | roff = rel->r_offset - 3; |
| 3271 | } |
| 3272 | else |
| 3273 | { |
| 3274 | /* leal foo(%reg), %eax; call ___tls_get_addr; nop |
| 3275 | Change it into: |
| 3276 | movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ |
| 3277 | roff = rel->r_offset - 2; |
| 3278 | } |
| 3279 | memcpy (contents + roff, |
| 3280 | "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); |
| 3281 | contents[roff + 7] = 0x80 | (val & 7); |
| 3282 | /* If foo is used only with foo@gotntpoff(%reg) and |
| 3283 | foo@indntpoff, but not with foo@gottpoff(%reg), change |
| 3284 | subl $foo@gottpoff(%reg), %eax |
| 3285 | into: |
| 3286 | addl $foo@gotntpoff(%reg), %eax. */ |
| 3287 | if (tls_type == GOT_TLS_IE_POS) |
| 3288 | contents[roff + 6] = 0x03; |
| 3289 | bfd_put_32 (output_bfd, |
| 3290 | htab->sgot->output_section->vma |
| 3291 | + htab->sgot->output_offset + off |
| 3292 | - htab->sgotplt->output_section->vma |
| 3293 | - htab->sgotplt->output_offset, |
| 3294 | contents + roff + 8); |
| 3295 | /* Skip R_386_PLT32. */ |
| 3296 | rel++; |
| 3297 | continue; |
| 3298 | } |
| 3299 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) |
| 3300 | { |
| 3301 | /* GDesc -> IE transition. |
| 3302 | It's originally something like: |
| 3303 | leal x@tlsdesc(%ebx), %eax |
| 3304 | |
| 3305 | Change it to: |
| 3306 | movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax |
| 3307 | or: |
| 3308 | movl x@gottpoff(%ebx), %eax # before negl %eax |
| 3309 | |
| 3310 | Registers other than %eax may be set up here. */ |
| 3311 | |
| 3312 | bfd_vma roff; |
| 3313 | |
| 3314 | /* First, make sure it's a leal adding ebx to a 32-bit |
| 3315 | offset into any register, although it's probably |
| 3316 | almost always going to be eax. */ |
| 3317 | roff = rel->r_offset; |
| 3318 | |
| 3319 | /* Now modify the instruction as appropriate. */ |
| 3320 | /* To turn a leal into a movl in the form we use it, it |
| 3321 | suffices to change the first byte from 0x8d to 0x8b. |
| 3322 | aoliva FIXME: should we decide to keep the leal, all |
| 3323 | we have to do is remove the statement below, and |
| 3324 | adjust the relaxation of R_386_TLS_DESC_CALL. */ |
| 3325 | bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); |
| 3326 | |
| 3327 | if (tls_type == GOT_TLS_IE_BOTH) |
| 3328 | off += 4; |
| 3329 | |
| 3330 | bfd_put_32 (output_bfd, |
| 3331 | htab->sgot->output_section->vma |
| 3332 | + htab->sgot->output_offset + off |
| 3333 | - htab->sgotplt->output_section->vma |
| 3334 | - htab->sgotplt->output_offset, |
| 3335 | contents + roff); |
| 3336 | continue; |
| 3337 | } |
| 3338 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) |
| 3339 | { |
| 3340 | /* GDesc -> IE transition. |
| 3341 | It's originally: |
| 3342 | call *(%eax) |
| 3343 | |
| 3344 | Change it to: |
| 3345 | xchg %ax,%ax |
| 3346 | or |
| 3347 | negl %eax |
| 3348 | depending on how we transformed the TLS_GOTDESC above. |
| 3349 | */ |
| 3350 | |
| 3351 | bfd_vma roff; |
| 3352 | |
| 3353 | roff = rel->r_offset; |
| 3354 | |
| 3355 | /* Now modify the instruction as appropriate. */ |
| 3356 | if (tls_type != GOT_TLS_IE_NEG) |
| 3357 | { |
| 3358 | /* xchg %ax,%ax */ |
| 3359 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 3360 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 3361 | } |
| 3362 | else |
| 3363 | { |
| 3364 | /* negl %eax */ |
| 3365 | bfd_put_8 (output_bfd, 0xf7, contents + roff); |
| 3366 | bfd_put_8 (output_bfd, 0xd8, contents + roff + 1); |
| 3367 | } |
| 3368 | |
| 3369 | continue; |
| 3370 | } |
| 3371 | else |
| 3372 | BFD_ASSERT (FALSE); |
| 3373 | break; |
| 3374 | |
| 3375 | case R_386_TLS_LDM: |
| 3376 | if (! elf_i386_tls_transition (info, input_bfd, |
| 3377 | input_section, contents, |
| 3378 | symtab_hdr, sym_hashes, |
| 3379 | &r_type, GOT_UNKNOWN, rel, |
| 3380 | relend, h)) |
| 3381 | return FALSE; |
| 3382 | |
| 3383 | if (r_type != R_386_TLS_LDM) |
| 3384 | { |
| 3385 | /* LD->LE transition: |
| 3386 | leal foo(%reg), %eax; call ___tls_get_addr. |
| 3387 | We change it into: |
| 3388 | movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */ |
| 3389 | BFD_ASSERT (r_type == R_386_TLS_LE_32); |
| 3390 | memcpy (contents + rel->r_offset - 2, |
| 3391 | "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); |
| 3392 | /* Skip R_386_PC32/R_386_PLT32. */ |
| 3393 | rel++; |
| 3394 | continue; |
| 3395 | } |
| 3396 | |
| 3397 | if (htab->sgot == NULL) |
| 3398 | abort (); |
| 3399 | |
| 3400 | off = htab->tls_ldm_got.offset; |
| 3401 | if (off & 1) |
| 3402 | off &= ~1; |
| 3403 | else |
| 3404 | { |
| 3405 | Elf_Internal_Rela outrel; |
| 3406 | bfd_byte *loc; |
| 3407 | |
| 3408 | if (htab->srelgot == NULL) |
| 3409 | abort (); |
| 3410 | |
| 3411 | outrel.r_offset = (htab->sgot->output_section->vma |
| 3412 | + htab->sgot->output_offset + off); |
| 3413 | |
| 3414 | bfd_put_32 (output_bfd, 0, |
| 3415 | htab->sgot->contents + off); |
| 3416 | bfd_put_32 (output_bfd, 0, |
| 3417 | htab->sgot->contents + off + 4); |
| 3418 | outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); |
| 3419 | loc = htab->srelgot->contents; |
| 3420 | loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3421 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3422 | htab->tls_ldm_got.offset |= 1; |
| 3423 | } |
| 3424 | relocation = htab->sgot->output_section->vma |
| 3425 | + htab->sgot->output_offset + off |
| 3426 | - htab->sgotplt->output_section->vma |
| 3427 | - htab->sgotplt->output_offset; |
| 3428 | unresolved_reloc = FALSE; |
| 3429 | break; |
| 3430 | |
| 3431 | case R_386_TLS_LDO_32: |
| 3432 | if (info->shared || (input_section->flags & SEC_CODE) == 0) |
| 3433 | relocation -= dtpoff_base (info); |
| 3434 | else |
| 3435 | /* When converting LDO to LE, we must negate. */ |
| 3436 | relocation = -tpoff (info, relocation); |
| 3437 | break; |
| 3438 | |
| 3439 | case R_386_TLS_LE_32: |
| 3440 | case R_386_TLS_LE: |
| 3441 | if (info->shared) |
| 3442 | { |
| 3443 | Elf_Internal_Rela outrel; |
| 3444 | asection *sreloc; |
| 3445 | bfd_byte *loc; |
| 3446 | int indx; |
| 3447 | |
| 3448 | outrel.r_offset = rel->r_offset |
| 3449 | + input_section->output_section->vma |
| 3450 | + input_section->output_offset; |
| 3451 | if (h != NULL && h->dynindx != -1) |
| 3452 | indx = h->dynindx; |
| 3453 | else |
| 3454 | indx = 0; |
| 3455 | if (r_type == R_386_TLS_LE_32) |
| 3456 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); |
| 3457 | else |
| 3458 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); |
| 3459 | sreloc = elf_section_data (input_section)->sreloc; |
| 3460 | if (sreloc == NULL) |
| 3461 | abort (); |
| 3462 | loc = sreloc->contents; |
| 3463 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3464 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3465 | if (indx) |
| 3466 | continue; |
| 3467 | else if (r_type == R_386_TLS_LE_32) |
| 3468 | relocation = dtpoff_base (info) - relocation; |
| 3469 | else |
| 3470 | relocation -= dtpoff_base (info); |
| 3471 | } |
| 3472 | else if (r_type == R_386_TLS_LE_32) |
| 3473 | relocation = tpoff (info, relocation); |
| 3474 | else |
| 3475 | relocation = -tpoff (info, relocation); |
| 3476 | break; |
| 3477 | |
| 3478 | default: |
| 3479 | break; |
| 3480 | } |
| 3481 | |
| 3482 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 3483 | because such sections are not SEC_ALLOC and thus ld.so will |
| 3484 | not process them. */ |
| 3485 | if (unresolved_reloc |
| 3486 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 3487 | && h->def_dynamic)) |
| 3488 | { |
| 3489 | (*_bfd_error_handler) |
| 3490 | (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), |
| 3491 | input_bfd, |
| 3492 | input_section, |
| 3493 | (long) rel->r_offset, |
| 3494 | howto->name, |
| 3495 | h->root.root.string); |
| 3496 | return FALSE; |
| 3497 | } |
| 3498 | |
| 3499 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 3500 | contents, rel->r_offset, |
| 3501 | relocation, 0); |
| 3502 | |
| 3503 | if (r != bfd_reloc_ok) |
| 3504 | { |
| 3505 | const char *name; |
| 3506 | |
| 3507 | if (h != NULL) |
| 3508 | name = h->root.root.string; |
| 3509 | else |
| 3510 | { |
| 3511 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 3512 | symtab_hdr->sh_link, |
| 3513 | sym->st_name); |
| 3514 | if (name == NULL) |
| 3515 | return FALSE; |
| 3516 | if (*name == '\0') |
| 3517 | name = bfd_section_name (input_bfd, sec); |
| 3518 | } |
| 3519 | |
| 3520 | if (r == bfd_reloc_overflow) |
| 3521 | { |
| 3522 | if (! ((*info->callbacks->reloc_overflow) |
| 3523 | (info, (h ? &h->root : NULL), name, howto->name, |
| 3524 | (bfd_vma) 0, input_bfd, input_section, |
| 3525 | rel->r_offset))) |
| 3526 | return FALSE; |
| 3527 | } |
| 3528 | else |
| 3529 | { |
| 3530 | (*_bfd_error_handler) |
| 3531 | (_("%B(%A+0x%lx): reloc against `%s': error %d"), |
| 3532 | input_bfd, input_section, |
| 3533 | (long) rel->r_offset, name, (int) r); |
| 3534 | return FALSE; |
| 3535 | } |
| 3536 | } |
| 3537 | } |
| 3538 | |
| 3539 | return TRUE; |
| 3540 | } |
| 3541 | |
| 3542 | /* Finish up dynamic symbol handling. We set the contents of various |
| 3543 | dynamic sections here. */ |
| 3544 | |
| 3545 | static bfd_boolean |
| 3546 | elf_i386_finish_dynamic_symbol (bfd *output_bfd, |
| 3547 | struct bfd_link_info *info, |
| 3548 | struct elf_link_hash_entry *h, |
| 3549 | Elf_Internal_Sym *sym) |
| 3550 | { |
| 3551 | struct elf_i386_link_hash_table *htab; |
| 3552 | |
| 3553 | htab = elf_i386_hash_table (info); |
| 3554 | |
| 3555 | if (h->plt.offset != (bfd_vma) -1) |
| 3556 | { |
| 3557 | bfd_vma plt_index; |
| 3558 | bfd_vma got_offset; |
| 3559 | Elf_Internal_Rela rel; |
| 3560 | bfd_byte *loc; |
| 3561 | |
| 3562 | /* This symbol has an entry in the procedure linkage table. Set |
| 3563 | it up. */ |
| 3564 | |
| 3565 | if (h->dynindx == -1 |
| 3566 | || htab->splt == NULL |
| 3567 | || htab->sgotplt == NULL |
| 3568 | || htab->srelplt == NULL) |
| 3569 | abort (); |
| 3570 | |
| 3571 | /* Get the index in the procedure linkage table which |
| 3572 | corresponds to this symbol. This is the index of this symbol |
| 3573 | in all the symbols for which we are making plt entries. The |
| 3574 | first entry in the procedure linkage table is reserved. */ |
| 3575 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 3576 | |
| 3577 | /* Get the offset into the .got table of the entry that |
| 3578 | corresponds to this function. Each .got entry is 4 bytes. |
| 3579 | The first three are reserved. */ |
| 3580 | got_offset = (plt_index + 3) * 4; |
| 3581 | |
| 3582 | /* Fill in the entry in the procedure linkage table. */ |
| 3583 | if (! info->shared) |
| 3584 | { |
| 3585 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry, |
| 3586 | PLT_ENTRY_SIZE); |
| 3587 | bfd_put_32 (output_bfd, |
| 3588 | (htab->sgotplt->output_section->vma |
| 3589 | + htab->sgotplt->output_offset |
| 3590 | + got_offset), |
| 3591 | htab->splt->contents + h->plt.offset + 2); |
| 3592 | |
| 3593 | if (htab->is_vxworks) |
| 3594 | { |
| 3595 | int s, k, reloc_index; |
| 3596 | |
| 3597 | /* Create the R_386_32 relocation referencing the GOT |
| 3598 | for this PLT entry. */ |
| 3599 | |
| 3600 | /* S: Current slot number (zero-based). */ |
| 3601 | s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE; |
| 3602 | /* K: Number of relocations for PLTResolve. */ |
| 3603 | if (info->shared) |
| 3604 | k = PLTRESOLVE_RELOCS_SHLIB; |
| 3605 | else |
| 3606 | k = PLTRESOLVE_RELOCS; |
| 3607 | /* Skip the PLTresolve relocations, and the relocations for |
| 3608 | the other PLT slots. */ |
| 3609 | reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS; |
| 3610 | loc = (htab->srelplt2->contents + reloc_index |
| 3611 | * sizeof (Elf32_External_Rel)); |
| 3612 | |
| 3613 | rel.r_offset = (htab->splt->output_section->vma |
| 3614 | + htab->splt->output_offset |
| 3615 | + h->plt.offset + 2), |
| 3616 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); |
| 3617 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3618 | |
| 3619 | /* Create the R_386_32 relocation referencing the beginning of |
| 3620 | the PLT for this GOT entry. */ |
| 3621 | rel.r_offset = (htab->sgotplt->output_section->vma |
| 3622 | + htab->sgotplt->output_offset |
| 3623 | + got_offset); |
| 3624 | rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); |
| 3625 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 3626 | loc + sizeof (Elf32_External_Rel)); |
| 3627 | } |
| 3628 | } |
| 3629 | else |
| 3630 | { |
| 3631 | memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry, |
| 3632 | PLT_ENTRY_SIZE); |
| 3633 | bfd_put_32 (output_bfd, got_offset, |
| 3634 | htab->splt->contents + h->plt.offset + 2); |
| 3635 | } |
| 3636 | |
| 3637 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), |
| 3638 | htab->splt->contents + h->plt.offset + 7); |
| 3639 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| 3640 | htab->splt->contents + h->plt.offset + 12); |
| 3641 | |
| 3642 | /* Fill in the entry in the global offset table. */ |
| 3643 | bfd_put_32 (output_bfd, |
| 3644 | (htab->splt->output_section->vma |
| 3645 | + htab->splt->output_offset |
| 3646 | + h->plt.offset |
| 3647 | + 6), |
| 3648 | htab->sgotplt->contents + got_offset); |
| 3649 | |
| 3650 | /* Fill in the entry in the .rel.plt section. */ |
| 3651 | rel.r_offset = (htab->sgotplt->output_section->vma |
| 3652 | + htab->sgotplt->output_offset |
| 3653 | + got_offset); |
| 3654 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); |
| 3655 | loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel); |
| 3656 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3657 | |
| 3658 | if (!h->def_regular) |
| 3659 | { |
| 3660 | /* Mark the symbol as undefined, rather than as defined in |
| 3661 | the .plt section. Leave the value if there were any |
| 3662 | relocations where pointer equality matters (this is a clue |
| 3663 | for the dynamic linker, to make function pointer |
| 3664 | comparisons work between an application and shared |
| 3665 | library), otherwise set it to zero. If a function is only |
| 3666 | called from a binary, there is no need to slow down |
| 3667 | shared libraries because of that. */ |
| 3668 | sym->st_shndx = SHN_UNDEF; |
| 3669 | if (!h->pointer_equality_needed) |
| 3670 | sym->st_value = 0; |
| 3671 | } |
| 3672 | } |
| 3673 | |
| 3674 | if (h->got.offset != (bfd_vma) -1 |
| 3675 | && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type) |
| 3676 | && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0) |
| 3677 | { |
| 3678 | Elf_Internal_Rela rel; |
| 3679 | bfd_byte *loc; |
| 3680 | |
| 3681 | /* This symbol has an entry in the global offset table. Set it |
| 3682 | up. */ |
| 3683 | |
| 3684 | if (htab->sgot == NULL || htab->srelgot == NULL) |
| 3685 | abort (); |
| 3686 | |
| 3687 | rel.r_offset = (htab->sgot->output_section->vma |
| 3688 | + htab->sgot->output_offset |
| 3689 | + (h->got.offset & ~(bfd_vma) 1)); |
| 3690 | |
| 3691 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 3692 | symbol is defined locally or was forced to be local because |
| 3693 | of a version file, we just want to emit a RELATIVE reloc. |
| 3694 | The entry in the global offset table will already have been |
| 3695 | initialized in the relocate_section function. */ |
| 3696 | if (info->shared |
| 3697 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 3698 | { |
| 3699 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 3700 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 3701 | } |
| 3702 | else |
| 3703 | { |
| 3704 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 3705 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
| 3706 | htab->sgot->contents + h->got.offset); |
| 3707 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); |
| 3708 | } |
| 3709 | |
| 3710 | loc = htab->srelgot->contents; |
| 3711 | loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3712 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3713 | } |
| 3714 | |
| 3715 | if (h->needs_copy) |
| 3716 | { |
| 3717 | Elf_Internal_Rela rel; |
| 3718 | bfd_byte *loc; |
| 3719 | |
| 3720 | /* This symbol needs a copy reloc. Set it up. */ |
| 3721 | |
| 3722 | if (h->dynindx == -1 |
| 3723 | || (h->root.type != bfd_link_hash_defined |
| 3724 | && h->root.type != bfd_link_hash_defweak) |
| 3725 | || htab->srelbss == NULL) |
| 3726 | abort (); |
| 3727 | |
| 3728 | rel.r_offset = (h->root.u.def.value |
| 3729 | + h->root.u.def.section->output_section->vma |
| 3730 | + h->root.u.def.section->output_offset); |
| 3731 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); |
| 3732 | loc = htab->srelbss->contents; |
| 3733 | loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3734 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3735 | } |
| 3736 | |
| 3737 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. |
| 3738 | On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it |
| 3739 | is relative to the ".got" section. */ |
| 3740 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 3741 | || (!htab->is_vxworks && h == htab->elf.hgot)) |
| 3742 | sym->st_shndx = SHN_ABS; |
| 3743 | |
| 3744 | return TRUE; |
| 3745 | } |
| 3746 | |
| 3747 | /* Used to decide how to sort relocs in an optimal manner for the |
| 3748 | dynamic linker, before writing them out. */ |
| 3749 | |
| 3750 | static enum elf_reloc_type_class |
| 3751 | elf_i386_reloc_type_class (const Elf_Internal_Rela *rela) |
| 3752 | { |
| 3753 | switch (ELF32_R_TYPE (rela->r_info)) |
| 3754 | { |
| 3755 | case R_386_RELATIVE: |
| 3756 | return reloc_class_relative; |
| 3757 | case R_386_JUMP_SLOT: |
| 3758 | return reloc_class_plt; |
| 3759 | case R_386_COPY: |
| 3760 | return reloc_class_copy; |
| 3761 | default: |
| 3762 | return reloc_class_normal; |
| 3763 | } |
| 3764 | } |
| 3765 | |
| 3766 | /* Finish up the dynamic sections. */ |
| 3767 | |
| 3768 | static bfd_boolean |
| 3769 | elf_i386_finish_dynamic_sections (bfd *output_bfd, |
| 3770 | struct bfd_link_info *info) |
| 3771 | { |
| 3772 | struct elf_i386_link_hash_table *htab; |
| 3773 | bfd *dynobj; |
| 3774 | asection *sdyn; |
| 3775 | |
| 3776 | htab = elf_i386_hash_table (info); |
| 3777 | dynobj = htab->elf.dynobj; |
| 3778 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 3779 | |
| 3780 | if (htab->elf.dynamic_sections_created) |
| 3781 | { |
| 3782 | Elf32_External_Dyn *dyncon, *dynconend; |
| 3783 | |
| 3784 | if (sdyn == NULL || htab->sgot == NULL) |
| 3785 | abort (); |
| 3786 | |
| 3787 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 3788 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); |
| 3789 | for (; dyncon < dynconend; dyncon++) |
| 3790 | { |
| 3791 | Elf_Internal_Dyn dyn; |
| 3792 | asection *s; |
| 3793 | |
| 3794 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 3795 | |
| 3796 | switch (dyn.d_tag) |
| 3797 | { |
| 3798 | default: |
| 3799 | continue; |
| 3800 | |
| 3801 | case DT_PLTGOT: |
| 3802 | s = htab->sgotplt; |
| 3803 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 3804 | break; |
| 3805 | |
| 3806 | case DT_JMPREL: |
| 3807 | s = htab->srelplt; |
| 3808 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 3809 | break; |
| 3810 | |
| 3811 | case DT_PLTRELSZ: |
| 3812 | s = htab->srelplt; |
| 3813 | dyn.d_un.d_val = s->size; |
| 3814 | break; |
| 3815 | |
| 3816 | case DT_RELSZ: |
| 3817 | /* My reading of the SVR4 ABI indicates that the |
| 3818 | procedure linkage table relocs (DT_JMPREL) should be |
| 3819 | included in the overall relocs (DT_REL). This is |
| 3820 | what Solaris does. However, UnixWare can not handle |
| 3821 | that case. Therefore, we override the DT_RELSZ entry |
| 3822 | here to make it not include the JMPREL relocs. */ |
| 3823 | s = htab->srelplt; |
| 3824 | if (s == NULL) |
| 3825 | continue; |
| 3826 | dyn.d_un.d_val -= s->size; |
| 3827 | break; |
| 3828 | |
| 3829 | case DT_REL: |
| 3830 | /* We may not be using the standard ELF linker script. |
| 3831 | If .rel.plt is the first .rel section, we adjust |
| 3832 | DT_REL to not include it. */ |
| 3833 | s = htab->srelplt; |
| 3834 | if (s == NULL) |
| 3835 | continue; |
| 3836 | if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) |
| 3837 | continue; |
| 3838 | dyn.d_un.d_ptr += s->size; |
| 3839 | break; |
| 3840 | } |
| 3841 | |
| 3842 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 3843 | } |
| 3844 | |
| 3845 | /* Fill in the first entry in the procedure linkage table. */ |
| 3846 | if (htab->splt && htab->splt->size > 0) |
| 3847 | { |
| 3848 | if (info->shared) |
| 3849 | { |
| 3850 | memcpy (htab->splt->contents, elf_i386_pic_plt0_entry, |
| 3851 | sizeof (elf_i386_pic_plt0_entry)); |
| 3852 | memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry), |
| 3853 | htab->plt0_pad_byte, |
| 3854 | PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry)); |
| 3855 | } |
| 3856 | else |
| 3857 | { |
| 3858 | memcpy (htab->splt->contents, elf_i386_plt0_entry, |
| 3859 | sizeof(elf_i386_plt0_entry)); |
| 3860 | memset (htab->splt->contents + sizeof (elf_i386_plt0_entry), |
| 3861 | htab->plt0_pad_byte, |
| 3862 | PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry)); |
| 3863 | bfd_put_32 (output_bfd, |
| 3864 | (htab->sgotplt->output_section->vma |
| 3865 | + htab->sgotplt->output_offset |
| 3866 | + 4), |
| 3867 | htab->splt->contents + 2); |
| 3868 | bfd_put_32 (output_bfd, |
| 3869 | (htab->sgotplt->output_section->vma |
| 3870 | + htab->sgotplt->output_offset |
| 3871 | + 8), |
| 3872 | htab->splt->contents + 8); |
| 3873 | |
| 3874 | if (htab->is_vxworks) |
| 3875 | { |
| 3876 | Elf_Internal_Rela rel; |
| 3877 | |
| 3878 | /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4. |
| 3879 | On IA32 we use REL relocations so the addend goes in |
| 3880 | the PLT directly. */ |
| 3881 | rel.r_offset = (htab->splt->output_section->vma |
| 3882 | + htab->splt->output_offset |
| 3883 | + 2); |
| 3884 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); |
| 3885 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 3886 | htab->srelplt2->contents); |
| 3887 | /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ |
| 3888 | rel.r_offset = (htab->splt->output_section->vma |
| 3889 | + htab->splt->output_offset |
| 3890 | + 8); |
| 3891 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); |
| 3892 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 3893 | htab->srelplt2->contents + |
| 3894 | sizeof (Elf32_External_Rel)); |
| 3895 | } |
| 3896 | } |
| 3897 | |
| 3898 | /* UnixWare sets the entsize of .plt to 4, although that doesn't |
| 3899 | really seem like the right value. */ |
| 3900 | elf_section_data (htab->splt->output_section) |
| 3901 | ->this_hdr.sh_entsize = 4; |
| 3902 | |
| 3903 | /* Correct the .rel.plt.unloaded relocations. */ |
| 3904 | if (htab->is_vxworks && !info->shared) |
| 3905 | { |
| 3906 | int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1; |
| 3907 | unsigned char *p; |
| 3908 | |
| 3909 | p = htab->srelplt2->contents; |
| 3910 | if (info->shared) |
| 3911 | p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel); |
| 3912 | else |
| 3913 | p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel); |
| 3914 | |
| 3915 | for (; num_plts; num_plts--) |
| 3916 | { |
| 3917 | Elf_Internal_Rela rel; |
| 3918 | bfd_elf32_swap_reloc_in (output_bfd, p, &rel); |
| 3919 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); |
| 3920 | bfd_elf32_swap_reloc_out (output_bfd, &rel, p); |
| 3921 | p += sizeof (Elf32_External_Rel); |
| 3922 | |
| 3923 | bfd_elf32_swap_reloc_in (output_bfd, p, &rel); |
| 3924 | rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); |
| 3925 | bfd_elf32_swap_reloc_out (output_bfd, &rel, p); |
| 3926 | p += sizeof (Elf32_External_Rel); |
| 3927 | } |
| 3928 | } |
| 3929 | } |
| 3930 | } |
| 3931 | |
| 3932 | if (htab->sgotplt) |
| 3933 | { |
| 3934 | /* Fill in the first three entries in the global offset table. */ |
| 3935 | if (htab->sgotplt->size > 0) |
| 3936 | { |
| 3937 | bfd_put_32 (output_bfd, |
| 3938 | (sdyn == NULL ? 0 |
| 3939 | : sdyn->output_section->vma + sdyn->output_offset), |
| 3940 | htab->sgotplt->contents); |
| 3941 | bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4); |
| 3942 | bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8); |
| 3943 | } |
| 3944 | |
| 3945 | elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4; |
| 3946 | } |
| 3947 | |
| 3948 | if (htab->sgot && htab->sgot->size > 0) |
| 3949 | elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4; |
| 3950 | |
| 3951 | return TRUE; |
| 3952 | } |
| 3953 | |
| 3954 | /* Return address for Ith PLT stub in section PLT, for relocation REL |
| 3955 | or (bfd_vma) -1 if it should not be included. */ |
| 3956 | |
| 3957 | static bfd_vma |
| 3958 | elf_i386_plt_sym_val (bfd_vma i, const asection *plt, |
| 3959 | const arelent *rel ATTRIBUTE_UNUSED) |
| 3960 | { |
| 3961 | return plt->vma + (i + 1) * PLT_ENTRY_SIZE; |
| 3962 | } |
| 3963 | |
| 3964 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ |
| 3965 | |
| 3966 | static bfd_boolean |
| 3967 | elf_i386_hash_symbol (struct elf_link_hash_entry *h) |
| 3968 | { |
| 3969 | if (h->plt.offset != (bfd_vma) -1 |
| 3970 | && !h->def_regular |
| 3971 | && !h->pointer_equality_needed) |
| 3972 | return FALSE; |
| 3973 | |
| 3974 | return _bfd_elf_hash_symbol (h); |
| 3975 | } |
| 3976 | |
| 3977 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec |
| 3978 | #define TARGET_LITTLE_NAME "elf32-i386" |
| 3979 | #define ELF_ARCH bfd_arch_i386 |
| 3980 | #define ELF_MACHINE_CODE EM_386 |
| 3981 | #define ELF_MAXPAGESIZE 0x1000 |
| 3982 | |
| 3983 | #define elf_backend_can_gc_sections 1 |
| 3984 | #define elf_backend_can_refcount 1 |
| 3985 | #define elf_backend_want_got_plt 1 |
| 3986 | #define elf_backend_plt_readonly 1 |
| 3987 | #define elf_backend_want_plt_sym 0 |
| 3988 | #define elf_backend_got_header_size 12 |
| 3989 | |
| 3990 | /* Support RELA for objdump of prelink objects. */ |
| 3991 | #define elf_info_to_howto elf_i386_info_to_howto_rel |
| 3992 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel |
| 3993 | |
| 3994 | #define bfd_elf32_mkobject elf_i386_mkobject |
| 3995 | |
| 3996 | #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name |
| 3997 | #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create |
| 3998 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup |
| 3999 | #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup |
| 4000 | |
| 4001 | #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol |
| 4002 | #define elf_backend_check_relocs elf_i386_check_relocs |
| 4003 | #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol |
| 4004 | #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections |
| 4005 | #define elf_backend_fake_sections elf_i386_fake_sections |
| 4006 | #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections |
| 4007 | #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol |
| 4008 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook |
| 4009 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook |
| 4010 | #define elf_backend_grok_prstatus elf_i386_grok_prstatus |
| 4011 | #define elf_backend_grok_psinfo elf_i386_grok_psinfo |
| 4012 | #define elf_backend_reloc_type_class elf_i386_reloc_type_class |
| 4013 | #define elf_backend_relocate_section elf_i386_relocate_section |
| 4014 | #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections |
| 4015 | #define elf_backend_always_size_sections elf_i386_always_size_sections |
| 4016 | #define elf_backend_omit_section_dynsym \ |
| 4017 | ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) |
| 4018 | #define elf_backend_plt_sym_val elf_i386_plt_sym_val |
| 4019 | #define elf_backend_hash_symbol elf_i386_hash_symbol |
| 4020 | |
| 4021 | #include "elf32-target.h" |
| 4022 | |
| 4023 | /* FreeBSD support. */ |
| 4024 | |
| 4025 | #undef TARGET_LITTLE_SYM |
| 4026 | #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec |
| 4027 | #undef TARGET_LITTLE_NAME |
| 4028 | #define TARGET_LITTLE_NAME "elf32-i386-freebsd" |
| 4029 | #undef ELF_OSABI |
| 4030 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 4031 | |
| 4032 | /* The kernel recognizes executables as valid only if they carry a |
| 4033 | "FreeBSD" label in the ELF header. So we put this label on all |
| 4034 | executables and (for simplicity) also all other object files. */ |
| 4035 | |
| 4036 | static void |
| 4037 | elf_i386_post_process_headers (bfd *abfd, |
| 4038 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 4039 | { |
| 4040 | Elf_Internal_Ehdr *i_ehdrp; |
| 4041 | |
| 4042 | i_ehdrp = elf_elfheader (abfd); |
| 4043 | |
| 4044 | /* Put an ABI label supported by FreeBSD >= 4.1. */ |
| 4045 | i_ehdrp->e_ident[EI_OSABI] = get_elf_backend_data (abfd)->elf_osabi; |
| 4046 | #ifdef OLD_FREEBSD_ABI_LABEL |
| 4047 | /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ |
| 4048 | memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); |
| 4049 | #endif |
| 4050 | } |
| 4051 | |
| 4052 | #undef elf_backend_post_process_headers |
| 4053 | #define elf_backend_post_process_headers elf_i386_post_process_headers |
| 4054 | #undef elf32_bed |
| 4055 | #define elf32_bed elf32_i386_fbsd_bed |
| 4056 | |
| 4057 | #include "elf32-target.h" |
| 4058 | |
| 4059 | /* VxWorks support. */ |
| 4060 | |
| 4061 | #undef TARGET_LITTLE_SYM |
| 4062 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec |
| 4063 | #undef TARGET_LITTLE_NAME |
| 4064 | #define TARGET_LITTLE_NAME "elf32-i386-vxworks" |
| 4065 | #undef ELF_OSABI |
| 4066 | |
| 4067 | /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */ |
| 4068 | |
| 4069 | static struct bfd_link_hash_table * |
| 4070 | elf_i386_vxworks_link_hash_table_create (bfd *abfd) |
| 4071 | { |
| 4072 | struct bfd_link_hash_table *ret; |
| 4073 | struct elf_i386_link_hash_table *htab; |
| 4074 | |
| 4075 | ret = elf_i386_link_hash_table_create (abfd); |
| 4076 | if (ret) |
| 4077 | { |
| 4078 | htab = (struct elf_i386_link_hash_table *) ret; |
| 4079 | htab->is_vxworks = 1; |
| 4080 | htab->plt0_pad_byte = 0x90; |
| 4081 | } |
| 4082 | |
| 4083 | return ret; |
| 4084 | } |
| 4085 | |
| 4086 | |
| 4087 | #undef elf_backend_post_process_headers |
| 4088 | #undef bfd_elf32_bfd_link_hash_table_create |
| 4089 | #define bfd_elf32_bfd_link_hash_table_create \ |
| 4090 | elf_i386_vxworks_link_hash_table_create |
| 4091 | #undef elf_backend_add_symbol_hook |
| 4092 | #define elf_backend_add_symbol_hook \ |
| 4093 | elf_vxworks_add_symbol_hook |
| 4094 | #undef elf_backend_link_output_symbol_hook |
| 4095 | #define elf_backend_link_output_symbol_hook \ |
| 4096 | elf_vxworks_link_output_symbol_hook |
| 4097 | #undef elf_backend_emit_relocs |
| 4098 | #define elf_backend_emit_relocs elf_vxworks_emit_relocs |
| 4099 | #undef elf_backend_final_write_processing |
| 4100 | #define elf_backend_final_write_processing \ |
| 4101 | elf_vxworks_final_write_processing |
| 4102 | |
| 4103 | /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so |
| 4104 | define it. */ |
| 4105 | #undef elf_backend_want_plt_sym |
| 4106 | #define elf_backend_want_plt_sym 1 |
| 4107 | |
| 4108 | #undef elf32_bed |
| 4109 | #define elf32_bed elf32_i386_vxworks_bed |
| 4110 | |
| 4111 | #include "elf32-target.h" |