| 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, 2008 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 | #include "objalloc.h" |
| 30 | #include "hashtab.h" |
| 31 | |
| 32 | /* 386 uses REL relocations instead of RELA. */ |
| 33 | #define USE_REL 1 |
| 34 | |
| 35 | #include "elf/i386.h" |
| 36 | |
| 37 | static reloc_howto_type elf_howto_table[]= |
| 38 | { |
| 39 | HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield, |
| 40 | bfd_elf_generic_reloc, "R_386_NONE", |
| 41 | TRUE, 0x00000000, 0x00000000, FALSE), |
| 42 | HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 43 | bfd_elf_generic_reloc, "R_386_32", |
| 44 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 45 | HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 46 | bfd_elf_generic_reloc, "R_386_PC32", |
| 47 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 48 | HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 49 | bfd_elf_generic_reloc, "R_386_GOT32", |
| 50 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 51 | HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 52 | bfd_elf_generic_reloc, "R_386_PLT32", |
| 53 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 54 | HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 55 | bfd_elf_generic_reloc, "R_386_COPY", |
| 56 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 57 | HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 58 | bfd_elf_generic_reloc, "R_386_GLOB_DAT", |
| 59 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 60 | HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 61 | bfd_elf_generic_reloc, "R_386_JUMP_SLOT", |
| 62 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 63 | HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 64 | bfd_elf_generic_reloc, "R_386_RELATIVE", |
| 65 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 66 | HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 67 | bfd_elf_generic_reloc, "R_386_GOTOFF", |
| 68 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 69 | HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 70 | bfd_elf_generic_reloc, "R_386_GOTPC", |
| 71 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 72 | |
| 73 | /* We have a gap in the reloc numbers here. |
| 74 | R_386_standard counts the number up to this point, and |
| 75 | R_386_ext_offset is the value to subtract from a reloc type of |
| 76 | R_386_16 thru R_386_PC8 to form an index into this table. */ |
| 77 | #define R_386_standard (R_386_GOTPC + 1) |
| 78 | #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard) |
| 79 | |
| 80 | /* These relocs are a GNU extension. */ |
| 81 | HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 82 | bfd_elf_generic_reloc, "R_386_TLS_TPOFF", |
| 83 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 84 | HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 85 | bfd_elf_generic_reloc, "R_386_TLS_IE", |
| 86 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 87 | HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 88 | bfd_elf_generic_reloc, "R_386_TLS_GOTIE", |
| 89 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 90 | HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 91 | bfd_elf_generic_reloc, "R_386_TLS_LE", |
| 92 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 93 | HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 94 | bfd_elf_generic_reloc, "R_386_TLS_GD", |
| 95 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 96 | HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 97 | bfd_elf_generic_reloc, "R_386_TLS_LDM", |
| 98 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 99 | HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, |
| 100 | bfd_elf_generic_reloc, "R_386_16", |
| 101 | TRUE, 0xffff, 0xffff, FALSE), |
| 102 | HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, |
| 103 | bfd_elf_generic_reloc, "R_386_PC16", |
| 104 | TRUE, 0xffff, 0xffff, TRUE), |
| 105 | HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, |
| 106 | bfd_elf_generic_reloc, "R_386_8", |
| 107 | TRUE, 0xff, 0xff, FALSE), |
| 108 | HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, |
| 109 | bfd_elf_generic_reloc, "R_386_PC8", |
| 110 | TRUE, 0xff, 0xff, TRUE), |
| 111 | |
| 112 | #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset) |
| 113 | #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext) |
| 114 | /* These are common with Solaris TLS implementation. */ |
| 115 | HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 116 | bfd_elf_generic_reloc, "R_386_TLS_LDO_32", |
| 117 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 118 | HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 119 | bfd_elf_generic_reloc, "R_386_TLS_IE_32", |
| 120 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 121 | HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 122 | bfd_elf_generic_reloc, "R_386_TLS_LE_32", |
| 123 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 124 | HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 125 | bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32", |
| 126 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 127 | HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 128 | bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32", |
| 129 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 130 | HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 131 | bfd_elf_generic_reloc, "R_386_TLS_TPOFF32", |
| 132 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 133 | EMPTY_HOWTO (38), |
| 134 | HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 135 | bfd_elf_generic_reloc, "R_386_TLS_GOTDESC", |
| 136 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 137 | HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, |
| 138 | bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL", |
| 139 | FALSE, 0, 0, FALSE), |
| 140 | HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 141 | bfd_elf_generic_reloc, "R_386_TLS_DESC", |
| 142 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 143 | HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 144 | bfd_elf_generic_reloc, "R_386_IRELATIVE", |
| 145 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 146 | |
| 147 | /* Another gap. */ |
| 148 | #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset) |
| 149 | #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative) |
| 150 | |
| 151 | /* GNU extension to record C++ vtable hierarchy. */ |
| 152 | HOWTO (R_386_GNU_VTINHERIT, /* type */ |
| 153 | 0, /* rightshift */ |
| 154 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 155 | 0, /* bitsize */ |
| 156 | FALSE, /* pc_relative */ |
| 157 | 0, /* bitpos */ |
| 158 | complain_overflow_dont, /* complain_on_overflow */ |
| 159 | NULL, /* special_function */ |
| 160 | "R_386_GNU_VTINHERIT", /* name */ |
| 161 | FALSE, /* partial_inplace */ |
| 162 | 0, /* src_mask */ |
| 163 | 0, /* dst_mask */ |
| 164 | FALSE), /* pcrel_offset */ |
| 165 | |
| 166 | /* GNU extension to record C++ vtable member usage. */ |
| 167 | HOWTO (R_386_GNU_VTENTRY, /* type */ |
| 168 | 0, /* rightshift */ |
| 169 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 170 | 0, /* bitsize */ |
| 171 | FALSE, /* pc_relative */ |
| 172 | 0, /* bitpos */ |
| 173 | complain_overflow_dont, /* complain_on_overflow */ |
| 174 | _bfd_elf_rel_vtable_reloc_fn, /* special_function */ |
| 175 | "R_386_GNU_VTENTRY", /* name */ |
| 176 | FALSE, /* partial_inplace */ |
| 177 | 0, /* src_mask */ |
| 178 | 0, /* dst_mask */ |
| 179 | FALSE) /* pcrel_offset */ |
| 180 | |
| 181 | #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset) |
| 182 | |
| 183 | }; |
| 184 | |
| 185 | #ifdef DEBUG_GEN_RELOC |
| 186 | #define TRACE(str) \ |
| 187 | fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) |
| 188 | #else |
| 189 | #define TRACE(str) |
| 190 | #endif |
| 191 | |
| 192 | static reloc_howto_type * |
| 193 | elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 194 | bfd_reloc_code_real_type code) |
| 195 | { |
| 196 | switch (code) |
| 197 | { |
| 198 | case BFD_RELOC_NONE: |
| 199 | TRACE ("BFD_RELOC_NONE"); |
| 200 | return &elf_howto_table[R_386_NONE]; |
| 201 | |
| 202 | case BFD_RELOC_32: |
| 203 | TRACE ("BFD_RELOC_32"); |
| 204 | return &elf_howto_table[R_386_32]; |
| 205 | |
| 206 | case BFD_RELOC_CTOR: |
| 207 | TRACE ("BFD_RELOC_CTOR"); |
| 208 | return &elf_howto_table[R_386_32]; |
| 209 | |
| 210 | case BFD_RELOC_32_PCREL: |
| 211 | TRACE ("BFD_RELOC_PC32"); |
| 212 | return &elf_howto_table[R_386_PC32]; |
| 213 | |
| 214 | case BFD_RELOC_386_GOT32: |
| 215 | TRACE ("BFD_RELOC_386_GOT32"); |
| 216 | return &elf_howto_table[R_386_GOT32]; |
| 217 | |
| 218 | case BFD_RELOC_386_PLT32: |
| 219 | TRACE ("BFD_RELOC_386_PLT32"); |
| 220 | return &elf_howto_table[R_386_PLT32]; |
| 221 | |
| 222 | case BFD_RELOC_386_COPY: |
| 223 | TRACE ("BFD_RELOC_386_COPY"); |
| 224 | return &elf_howto_table[R_386_COPY]; |
| 225 | |
| 226 | case BFD_RELOC_386_GLOB_DAT: |
| 227 | TRACE ("BFD_RELOC_386_GLOB_DAT"); |
| 228 | return &elf_howto_table[R_386_GLOB_DAT]; |
| 229 | |
| 230 | case BFD_RELOC_386_JUMP_SLOT: |
| 231 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); |
| 232 | return &elf_howto_table[R_386_JUMP_SLOT]; |
| 233 | |
| 234 | case BFD_RELOC_386_RELATIVE: |
| 235 | TRACE ("BFD_RELOC_386_RELATIVE"); |
| 236 | return &elf_howto_table[R_386_RELATIVE]; |
| 237 | |
| 238 | case BFD_RELOC_386_GOTOFF: |
| 239 | TRACE ("BFD_RELOC_386_GOTOFF"); |
| 240 | return &elf_howto_table[R_386_GOTOFF]; |
| 241 | |
| 242 | case BFD_RELOC_386_GOTPC: |
| 243 | TRACE ("BFD_RELOC_386_GOTPC"); |
| 244 | return &elf_howto_table[R_386_GOTPC]; |
| 245 | |
| 246 | /* These relocs are a GNU extension. */ |
| 247 | case BFD_RELOC_386_TLS_TPOFF: |
| 248 | TRACE ("BFD_RELOC_386_TLS_TPOFF"); |
| 249 | return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset]; |
| 250 | |
| 251 | case BFD_RELOC_386_TLS_IE: |
| 252 | TRACE ("BFD_RELOC_386_TLS_IE"); |
| 253 | return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset]; |
| 254 | |
| 255 | case BFD_RELOC_386_TLS_GOTIE: |
| 256 | TRACE ("BFD_RELOC_386_TLS_GOTIE"); |
| 257 | return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset]; |
| 258 | |
| 259 | case BFD_RELOC_386_TLS_LE: |
| 260 | TRACE ("BFD_RELOC_386_TLS_LE"); |
| 261 | return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset]; |
| 262 | |
| 263 | case BFD_RELOC_386_TLS_GD: |
| 264 | TRACE ("BFD_RELOC_386_TLS_GD"); |
| 265 | return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset]; |
| 266 | |
| 267 | case BFD_RELOC_386_TLS_LDM: |
| 268 | TRACE ("BFD_RELOC_386_TLS_LDM"); |
| 269 | return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset]; |
| 270 | |
| 271 | case BFD_RELOC_16: |
| 272 | TRACE ("BFD_RELOC_16"); |
| 273 | return &elf_howto_table[R_386_16 - R_386_ext_offset]; |
| 274 | |
| 275 | case BFD_RELOC_16_PCREL: |
| 276 | TRACE ("BFD_RELOC_16_PCREL"); |
| 277 | return &elf_howto_table[R_386_PC16 - R_386_ext_offset]; |
| 278 | |
| 279 | case BFD_RELOC_8: |
| 280 | TRACE ("BFD_RELOC_8"); |
| 281 | return &elf_howto_table[R_386_8 - R_386_ext_offset]; |
| 282 | |
| 283 | case BFD_RELOC_8_PCREL: |
| 284 | TRACE ("BFD_RELOC_8_PCREL"); |
| 285 | return &elf_howto_table[R_386_PC8 - R_386_ext_offset]; |
| 286 | |
| 287 | /* Common with Sun TLS implementation. */ |
| 288 | case BFD_RELOC_386_TLS_LDO_32: |
| 289 | TRACE ("BFD_RELOC_386_TLS_LDO_32"); |
| 290 | return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset]; |
| 291 | |
| 292 | case BFD_RELOC_386_TLS_IE_32: |
| 293 | TRACE ("BFD_RELOC_386_TLS_IE_32"); |
| 294 | return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset]; |
| 295 | |
| 296 | case BFD_RELOC_386_TLS_LE_32: |
| 297 | TRACE ("BFD_RELOC_386_TLS_LE_32"); |
| 298 | return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset]; |
| 299 | |
| 300 | case BFD_RELOC_386_TLS_DTPMOD32: |
| 301 | TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); |
| 302 | return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset]; |
| 303 | |
| 304 | case BFD_RELOC_386_TLS_DTPOFF32: |
| 305 | TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); |
| 306 | return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset]; |
| 307 | |
| 308 | case BFD_RELOC_386_TLS_TPOFF32: |
| 309 | TRACE ("BFD_RELOC_386_TLS_TPOFF32"); |
| 310 | return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset]; |
| 311 | |
| 312 | case BFD_RELOC_386_TLS_GOTDESC: |
| 313 | TRACE ("BFD_RELOC_386_TLS_GOTDESC"); |
| 314 | return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset]; |
| 315 | |
| 316 | case BFD_RELOC_386_TLS_DESC_CALL: |
| 317 | TRACE ("BFD_RELOC_386_TLS_DESC_CALL"); |
| 318 | return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset]; |
| 319 | |
| 320 | case BFD_RELOC_386_TLS_DESC: |
| 321 | TRACE ("BFD_RELOC_386_TLS_DESC"); |
| 322 | return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset]; |
| 323 | |
| 324 | case BFD_RELOC_386_IRELATIVE: |
| 325 | TRACE ("BFD_RELOC_386_IRELATIVE"); |
| 326 | return &elf_howto_table[R_386_IRELATIVE]; |
| 327 | |
| 328 | case BFD_RELOC_VTABLE_INHERIT: |
| 329 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); |
| 330 | return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset]; |
| 331 | |
| 332 | case BFD_RELOC_VTABLE_ENTRY: |
| 333 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); |
| 334 | return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset]; |
| 335 | |
| 336 | default: |
| 337 | break; |
| 338 | } |
| 339 | |
| 340 | TRACE ("Unknown"); |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | static reloc_howto_type * |
| 345 | elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 346 | const char *r_name) |
| 347 | { |
| 348 | unsigned int i; |
| 349 | |
| 350 | for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) |
| 351 | if (elf_howto_table[i].name != NULL |
| 352 | && strcasecmp (elf_howto_table[i].name, r_name) == 0) |
| 353 | return &elf_howto_table[i]; |
| 354 | |
| 355 | return NULL; |
| 356 | } |
| 357 | |
| 358 | static reloc_howto_type * |
| 359 | elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type) |
| 360 | { |
| 361 | unsigned int indx; |
| 362 | |
| 363 | if ((indx = r_type) >= R_386_standard |
| 364 | && ((indx = r_type - R_386_ext_offset) - R_386_standard |
| 365 | >= R_386_ext - R_386_standard) |
| 366 | && ((indx = r_type - R_386_tls_offset) - R_386_ext |
| 367 | >= R_386_irelative - R_386_ext) |
| 368 | && ((indx = r_type - R_386_vt_offset) - R_386_irelative |
| 369 | >= R_386_vt - R_386_irelative)) |
| 370 | { |
| 371 | (*_bfd_error_handler) (_("%B: invalid relocation type %d"), |
| 372 | abfd, (int) r_type); |
| 373 | indx = R_386_NONE; |
| 374 | } |
| 375 | BFD_ASSERT (elf_howto_table [indx].type == r_type); |
| 376 | return &elf_howto_table[indx]; |
| 377 | } |
| 378 | |
| 379 | static void |
| 380 | elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, |
| 381 | arelent *cache_ptr, |
| 382 | Elf_Internal_Rela *dst) |
| 383 | { |
| 384 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
| 385 | cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type); |
| 386 | } |
| 387 | |
| 388 | /* Return whether a symbol name implies a local label. The UnixWare |
| 389 | 2.1 cc generates temporary symbols that start with .X, so we |
| 390 | recognize them here. FIXME: do other SVR4 compilers also use .X?. |
| 391 | If so, we should move the .X recognition into |
| 392 | _bfd_elf_is_local_label_name. */ |
| 393 | |
| 394 | static bfd_boolean |
| 395 | elf_i386_is_local_label_name (bfd *abfd, const char *name) |
| 396 | { |
| 397 | if (name[0] == '.' && name[1] == 'X') |
| 398 | return TRUE; |
| 399 | |
| 400 | return _bfd_elf_is_local_label_name (abfd, name); |
| 401 | } |
| 402 | \f |
| 403 | /* Support for core dump NOTE sections. */ |
| 404 | |
| 405 | static bfd_boolean |
| 406 | elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 407 | { |
| 408 | int offset; |
| 409 | size_t size; |
| 410 | |
| 411 | if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) |
| 412 | { |
| 413 | int pr_version = bfd_get_32 (abfd, note->descdata); |
| 414 | |
| 415 | if (pr_version != 1) |
| 416 | return FALSE; |
| 417 | |
| 418 | /* pr_cursig */ |
| 419 | elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20); |
| 420 | |
| 421 | /* pr_pid */ |
| 422 | elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); |
| 423 | |
| 424 | /* pr_reg */ |
| 425 | offset = 28; |
| 426 | size = bfd_get_32 (abfd, note->descdata + 8); |
| 427 | } |
| 428 | else |
| 429 | { |
| 430 | switch (note->descsz) |
| 431 | { |
| 432 | default: |
| 433 | return FALSE; |
| 434 | |
| 435 | case 144: /* Linux/i386 */ |
| 436 | /* pr_cursig */ |
| 437 | elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); |
| 438 | |
| 439 | /* pr_pid */ |
| 440 | elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); |
| 441 | |
| 442 | /* pr_reg */ |
| 443 | offset = 72; |
| 444 | size = 68; |
| 445 | |
| 446 | break; |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | /* Make a ".reg/999" section. */ |
| 451 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 452 | size, note->descpos + offset); |
| 453 | } |
| 454 | |
| 455 | static bfd_boolean |
| 456 | elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 457 | { |
| 458 | if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) |
| 459 | { |
| 460 | int pr_version = bfd_get_32 (abfd, note->descdata); |
| 461 | |
| 462 | if (pr_version != 1) |
| 463 | return FALSE; |
| 464 | |
| 465 | elf_tdata (abfd)->core_program |
| 466 | = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); |
| 467 | elf_tdata (abfd)->core_command |
| 468 | = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); |
| 469 | } |
| 470 | else |
| 471 | { |
| 472 | switch (note->descsz) |
| 473 | { |
| 474 | default: |
| 475 | return FALSE; |
| 476 | |
| 477 | case 124: /* Linux/i386 elf_prpsinfo. */ |
| 478 | elf_tdata (abfd)->core_program |
| 479 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); |
| 480 | elf_tdata (abfd)->core_command |
| 481 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | /* Note that for some reason, a spurious space is tacked |
| 486 | onto the end of the args in some (at least one anyway) |
| 487 | implementations, so strip it off if it exists. */ |
| 488 | { |
| 489 | char *command = elf_tdata (abfd)->core_command; |
| 490 | int n = strlen (command); |
| 491 | |
| 492 | if (0 < n && command[n - 1] == ' ') |
| 493 | command[n - 1] = '\0'; |
| 494 | } |
| 495 | |
| 496 | return TRUE; |
| 497 | } |
| 498 | \f |
| 499 | /* Functions for the i386 ELF linker. |
| 500 | |
| 501 | In order to gain some understanding of code in this file without |
| 502 | knowing all the intricate details of the linker, note the |
| 503 | following: |
| 504 | |
| 505 | Functions named elf_i386_* are called by external routines, other |
| 506 | functions are only called locally. elf_i386_* functions appear |
| 507 | in this file more or less in the order in which they are called |
| 508 | from external routines. eg. elf_i386_check_relocs is called |
| 509 | early in the link process, elf_i386_finish_dynamic_sections is |
| 510 | one of the last functions. */ |
| 511 | |
| 512 | |
| 513 | /* The name of the dynamic interpreter. This is put in the .interp |
| 514 | section. */ |
| 515 | |
| 516 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" |
| 517 | |
| 518 | /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid |
| 519 | copying dynamic variables from a shared lib into an app's dynbss |
| 520 | section, and instead use a dynamic relocation to point into the |
| 521 | shared lib. */ |
| 522 | #define ELIMINATE_COPY_RELOCS 1 |
| 523 | |
| 524 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 525 | |
| 526 | #define PLT_ENTRY_SIZE 16 |
| 527 | |
| 528 | /* The first entry in an absolute procedure linkage table looks like |
| 529 | this. See the SVR4 ABI i386 supplement to see how this works. |
| 530 | Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ |
| 531 | |
| 532 | static const bfd_byte elf_i386_plt0_entry[12] = |
| 533 | { |
| 534 | 0xff, 0x35, /* pushl contents of address */ |
| 535 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ |
| 536 | 0xff, 0x25, /* jmp indirect */ |
| 537 | 0, 0, 0, 0 /* replaced with address of .got + 8. */ |
| 538 | }; |
| 539 | |
| 540 | /* Subsequent entries in an absolute procedure linkage table look like |
| 541 | this. */ |
| 542 | |
| 543 | static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] = |
| 544 | { |
| 545 | 0xff, 0x25, /* jmp indirect */ |
| 546 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ |
| 547 | 0x68, /* pushl immediate */ |
| 548 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 549 | 0xe9, /* jmp relative */ |
| 550 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 551 | }; |
| 552 | |
| 553 | /* The first entry in a PIC procedure linkage table look like this. |
| 554 | Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */ |
| 555 | |
| 556 | static const bfd_byte elf_i386_pic_plt0_entry[12] = |
| 557 | { |
| 558 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ |
| 559 | 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */ |
| 560 | }; |
| 561 | |
| 562 | /* Subsequent entries in a PIC procedure linkage table look like this. */ |
| 563 | |
| 564 | static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = |
| 565 | { |
| 566 | 0xff, 0xa3, /* jmp *offset(%ebx) */ |
| 567 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ |
| 568 | 0x68, /* pushl immediate */ |
| 569 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 570 | 0xe9, /* jmp relative */ |
| 571 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 572 | }; |
| 573 | |
| 574 | /* On VxWorks, the .rel.plt.unloaded section has absolute relocations |
| 575 | for the PLTResolve stub and then for each PLT entry. */ |
| 576 | #define PLTRESOLVE_RELOCS_SHLIB 0 |
| 577 | #define PLTRESOLVE_RELOCS 2 |
| 578 | #define PLT_NON_JUMP_SLOT_RELOCS 2 |
| 579 | |
| 580 | /* i386 ELF linker hash entry. */ |
| 581 | |
| 582 | struct elf_i386_link_hash_entry |
| 583 | { |
| 584 | struct elf_link_hash_entry elf; |
| 585 | |
| 586 | /* Track dynamic relocs copied for this symbol. */ |
| 587 | struct elf_dyn_relocs *dyn_relocs; |
| 588 | |
| 589 | #define GOT_UNKNOWN 0 |
| 590 | #define GOT_NORMAL 1 |
| 591 | #define GOT_TLS_GD 2 |
| 592 | #define GOT_TLS_IE 4 |
| 593 | #define GOT_TLS_IE_POS 5 |
| 594 | #define GOT_TLS_IE_NEG 6 |
| 595 | #define GOT_TLS_IE_BOTH 7 |
| 596 | #define GOT_TLS_GDESC 8 |
| 597 | #define GOT_TLS_GD_BOTH_P(type) \ |
| 598 | ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) |
| 599 | #define GOT_TLS_GD_P(type) \ |
| 600 | ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) |
| 601 | #define GOT_TLS_GDESC_P(type) \ |
| 602 | ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) |
| 603 | #define GOT_TLS_GD_ANY_P(type) \ |
| 604 | (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) |
| 605 | unsigned char tls_type; |
| 606 | |
| 607 | /* Offset of the GOTPLT entry reserved for the TLS descriptor, |
| 608 | starting at the end of the jump table. */ |
| 609 | bfd_vma tlsdesc_got; |
| 610 | }; |
| 611 | |
| 612 | #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent)) |
| 613 | |
| 614 | struct elf_i386_obj_tdata |
| 615 | { |
| 616 | struct elf_obj_tdata root; |
| 617 | |
| 618 | /* tls_type for each local got entry. */ |
| 619 | char *local_got_tls_type; |
| 620 | |
| 621 | /* GOTPLT entries for TLS descriptors. */ |
| 622 | bfd_vma *local_tlsdesc_gotent; |
| 623 | }; |
| 624 | |
| 625 | #define elf_i386_tdata(abfd) \ |
| 626 | ((struct elf_i386_obj_tdata *) (abfd)->tdata.any) |
| 627 | |
| 628 | #define elf_i386_local_got_tls_type(abfd) \ |
| 629 | (elf_i386_tdata (abfd)->local_got_tls_type) |
| 630 | |
| 631 | #define elf_i386_local_tlsdesc_gotent(abfd) \ |
| 632 | (elf_i386_tdata (abfd)->local_tlsdesc_gotent) |
| 633 | |
| 634 | #define is_i386_elf(bfd) \ |
| 635 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ |
| 636 | && elf_tdata (bfd) != NULL \ |
| 637 | && elf_object_id (bfd) == I386_ELF_TDATA) |
| 638 | |
| 639 | static bfd_boolean |
| 640 | elf_i386_mkobject (bfd *abfd) |
| 641 | { |
| 642 | return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata), |
| 643 | I386_ELF_TDATA); |
| 644 | } |
| 645 | |
| 646 | /* i386 ELF linker hash table. */ |
| 647 | |
| 648 | struct elf_i386_link_hash_table |
| 649 | { |
| 650 | struct elf_link_hash_table elf; |
| 651 | |
| 652 | /* Short-cuts to get to dynamic linker sections. */ |
| 653 | asection *sdynbss; |
| 654 | asection *srelbss; |
| 655 | |
| 656 | /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */ |
| 657 | asection *srelplt2; |
| 658 | |
| 659 | /* True if the target system is VxWorks. */ |
| 660 | int is_vxworks; |
| 661 | |
| 662 | /* Value used to fill the last word of the first plt entry. */ |
| 663 | bfd_byte plt0_pad_byte; |
| 664 | |
| 665 | /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */ |
| 666 | bfd_vma next_tls_desc_index; |
| 667 | |
| 668 | union { |
| 669 | bfd_signed_vma refcount; |
| 670 | bfd_vma offset; |
| 671 | } tls_ldm_got; |
| 672 | |
| 673 | /* The amount of space used by the reserved portion of the sgotplt |
| 674 | section, plus whatever space is used by the jump slots. */ |
| 675 | bfd_vma sgotplt_jump_table_size; |
| 676 | |
| 677 | /* Small local sym cache. */ |
| 678 | struct sym_cache sym_cache; |
| 679 | |
| 680 | /* _TLS_MODULE_BASE_ symbol. */ |
| 681 | struct bfd_link_hash_entry *tls_module_base; |
| 682 | |
| 683 | /* Used by local STT_GNU_IFUNC symbols. */ |
| 684 | htab_t loc_hash_table; |
| 685 | void *loc_hash_memory; |
| 686 | }; |
| 687 | |
| 688 | /* Get the i386 ELF linker hash table from a link_info structure. */ |
| 689 | |
| 690 | #define elf_i386_hash_table(p) \ |
| 691 | ((struct elf_i386_link_hash_table *) ((p)->hash)) |
| 692 | |
| 693 | #define elf_i386_compute_jump_table_size(htab) \ |
| 694 | ((htab)->next_tls_desc_index * 4) |
| 695 | |
| 696 | /* Create an entry in an i386 ELF linker hash table. */ |
| 697 | |
| 698 | static struct bfd_hash_entry * |
| 699 | elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry, |
| 700 | struct bfd_hash_table *table, |
| 701 | const char *string) |
| 702 | { |
| 703 | /* Allocate the structure if it has not already been allocated by a |
| 704 | subclass. */ |
| 705 | if (entry == NULL) |
| 706 | { |
| 707 | entry = bfd_hash_allocate (table, |
| 708 | sizeof (struct elf_i386_link_hash_entry)); |
| 709 | if (entry == NULL) |
| 710 | return entry; |
| 711 | } |
| 712 | |
| 713 | /* Call the allocation method of the superclass. */ |
| 714 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 715 | if (entry != NULL) |
| 716 | { |
| 717 | struct elf_i386_link_hash_entry *eh; |
| 718 | |
| 719 | eh = (struct elf_i386_link_hash_entry *) entry; |
| 720 | eh->dyn_relocs = NULL; |
| 721 | eh->tls_type = GOT_UNKNOWN; |
| 722 | eh->tlsdesc_got = (bfd_vma) -1; |
| 723 | } |
| 724 | |
| 725 | return entry; |
| 726 | } |
| 727 | |
| 728 | /* Compute a hash of a local hash entry. We use elf_link_hash_entry |
| 729 | for local symbol so that we can handle local STT_GNU_IFUNC symbols |
| 730 | as global symbol. We reuse indx and dynstr_index for local symbol |
| 731 | hash since they aren't used by global symbols in this backend. */ |
| 732 | |
| 733 | static hashval_t |
| 734 | elf_i386_local_htab_hash (const void *ptr) |
| 735 | { |
| 736 | struct elf_link_hash_entry *h |
| 737 | = (struct elf_link_hash_entry *) ptr; |
| 738 | return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); |
| 739 | } |
| 740 | |
| 741 | /* Compare local hash entries. */ |
| 742 | |
| 743 | static int |
| 744 | elf_i386_local_htab_eq (const void *ptr1, const void *ptr2) |
| 745 | { |
| 746 | struct elf_link_hash_entry *h1 |
| 747 | = (struct elf_link_hash_entry *) ptr1; |
| 748 | struct elf_link_hash_entry *h2 |
| 749 | = (struct elf_link_hash_entry *) ptr2; |
| 750 | |
| 751 | return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; |
| 752 | } |
| 753 | |
| 754 | /* Find and/or create a hash entry for local symbol. */ |
| 755 | |
| 756 | static struct elf_link_hash_entry * |
| 757 | elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab, |
| 758 | bfd *abfd, const Elf_Internal_Rela *rel, |
| 759 | bfd_boolean create) |
| 760 | { |
| 761 | struct elf_i386_link_hash_entry e, *ret; |
| 762 | asection *sec = abfd->sections; |
| 763 | hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, |
| 764 | ELF32_R_SYM (rel->r_info)); |
| 765 | void **slot; |
| 766 | |
| 767 | e.elf.indx = sec->id; |
| 768 | e.elf.dynstr_index = ELF32_R_SYM (rel->r_info); |
| 769 | slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, |
| 770 | create ? INSERT : NO_INSERT); |
| 771 | |
| 772 | if (!slot) |
| 773 | return NULL; |
| 774 | |
| 775 | if (*slot) |
| 776 | { |
| 777 | ret = (struct elf_i386_link_hash_entry *) *slot; |
| 778 | return &ret->elf; |
| 779 | } |
| 780 | |
| 781 | ret = (struct elf_i386_link_hash_entry *) |
| 782 | objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, |
| 783 | sizeof (struct elf_i386_link_hash_entry)); |
| 784 | if (ret) |
| 785 | { |
| 786 | memset (ret, 0, sizeof (*ret)); |
| 787 | ret->elf.indx = sec->id; |
| 788 | ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info); |
| 789 | ret->elf.dynindx = -1; |
| 790 | ret->elf.plt.offset = (bfd_vma) -1; |
| 791 | ret->elf.got.offset = (bfd_vma) -1; |
| 792 | *slot = ret; |
| 793 | } |
| 794 | return &ret->elf; |
| 795 | } |
| 796 | |
| 797 | /* Create an i386 ELF linker hash table. */ |
| 798 | |
| 799 | static struct bfd_link_hash_table * |
| 800 | elf_i386_link_hash_table_create (bfd *abfd) |
| 801 | { |
| 802 | struct elf_i386_link_hash_table *ret; |
| 803 | bfd_size_type amt = sizeof (struct elf_i386_link_hash_table); |
| 804 | |
| 805 | ret = bfd_malloc (amt); |
| 806 | if (ret == NULL) |
| 807 | return NULL; |
| 808 | |
| 809 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, |
| 810 | elf_i386_link_hash_newfunc, |
| 811 | sizeof (struct elf_i386_link_hash_entry))) |
| 812 | { |
| 813 | free (ret); |
| 814 | return NULL; |
| 815 | } |
| 816 | |
| 817 | ret->sdynbss = NULL; |
| 818 | ret->srelbss = NULL; |
| 819 | ret->tls_ldm_got.refcount = 0; |
| 820 | ret->next_tls_desc_index = 0; |
| 821 | ret->sgotplt_jump_table_size = 0; |
| 822 | ret->sym_cache.abfd = NULL; |
| 823 | ret->is_vxworks = 0; |
| 824 | ret->srelplt2 = NULL; |
| 825 | ret->plt0_pad_byte = 0; |
| 826 | ret->tls_module_base = NULL; |
| 827 | |
| 828 | ret->loc_hash_table = htab_try_create (1024, |
| 829 | elf_i386_local_htab_hash, |
| 830 | elf_i386_local_htab_eq, |
| 831 | NULL); |
| 832 | ret->loc_hash_memory = objalloc_create (); |
| 833 | if (!ret->loc_hash_table || !ret->loc_hash_memory) |
| 834 | { |
| 835 | free (ret); |
| 836 | return NULL; |
| 837 | } |
| 838 | |
| 839 | return &ret->elf.root; |
| 840 | } |
| 841 | |
| 842 | /* Destroy an i386 ELF linker hash table. */ |
| 843 | |
| 844 | static void |
| 845 | elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash) |
| 846 | { |
| 847 | struct elf_i386_link_hash_table *htab |
| 848 | = (struct elf_i386_link_hash_table *) hash; |
| 849 | |
| 850 | if (htab->loc_hash_table) |
| 851 | htab_delete (htab->loc_hash_table); |
| 852 | if (htab->loc_hash_memory) |
| 853 | objalloc_free ((struct objalloc *) htab->loc_hash_memory); |
| 854 | _bfd_generic_link_hash_table_free (hash); |
| 855 | } |
| 856 | |
| 857 | /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and |
| 858 | .rel.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 859 | hash table. */ |
| 860 | |
| 861 | static bfd_boolean |
| 862 | elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) |
| 863 | { |
| 864 | struct elf_i386_link_hash_table *htab; |
| 865 | |
| 866 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 867 | return FALSE; |
| 868 | |
| 869 | htab = elf_i386_hash_table (info); |
| 870 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 871 | if (!info->shared) |
| 872 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss"); |
| 873 | |
| 874 | if (!htab->sdynbss |
| 875 | || (!info->shared && !htab->srelbss)) |
| 876 | abort (); |
| 877 | |
| 878 | if (htab->is_vxworks |
| 879 | && !elf_vxworks_create_dynamic_sections (dynobj, info, |
| 880 | &htab->srelplt2)) |
| 881 | return FALSE; |
| 882 | |
| 883 | return TRUE; |
| 884 | } |
| 885 | |
| 886 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 887 | |
| 888 | static void |
| 889 | elf_i386_copy_indirect_symbol (struct bfd_link_info *info, |
| 890 | struct elf_link_hash_entry *dir, |
| 891 | struct elf_link_hash_entry *ind) |
| 892 | { |
| 893 | struct elf_i386_link_hash_entry *edir, *eind; |
| 894 | |
| 895 | edir = (struct elf_i386_link_hash_entry *) dir; |
| 896 | eind = (struct elf_i386_link_hash_entry *) ind; |
| 897 | |
| 898 | if (eind->dyn_relocs != NULL) |
| 899 | { |
| 900 | if (edir->dyn_relocs != NULL) |
| 901 | { |
| 902 | struct elf_dyn_relocs **pp; |
| 903 | struct elf_dyn_relocs *p; |
| 904 | |
| 905 | /* Add reloc counts against the indirect sym to the direct sym |
| 906 | list. Merge any entries against the same section. */ |
| 907 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| 908 | { |
| 909 | struct elf_dyn_relocs *q; |
| 910 | |
| 911 | for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| 912 | if (q->sec == p->sec) |
| 913 | { |
| 914 | q->pc_count += p->pc_count; |
| 915 | q->count += p->count; |
| 916 | *pp = p->next; |
| 917 | break; |
| 918 | } |
| 919 | if (q == NULL) |
| 920 | pp = &p->next; |
| 921 | } |
| 922 | *pp = edir->dyn_relocs; |
| 923 | } |
| 924 | |
| 925 | edir->dyn_relocs = eind->dyn_relocs; |
| 926 | eind->dyn_relocs = NULL; |
| 927 | } |
| 928 | |
| 929 | if (ind->root.type == bfd_link_hash_indirect |
| 930 | && dir->got.refcount <= 0) |
| 931 | { |
| 932 | edir->tls_type = eind->tls_type; |
| 933 | eind->tls_type = GOT_UNKNOWN; |
| 934 | } |
| 935 | |
| 936 | if (ELIMINATE_COPY_RELOCS |
| 937 | && ind->root.type != bfd_link_hash_indirect |
| 938 | && dir->dynamic_adjusted) |
| 939 | { |
| 940 | /* If called to transfer flags for a weakdef during processing |
| 941 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. |
| 942 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ |
| 943 | dir->ref_dynamic |= ind->ref_dynamic; |
| 944 | dir->ref_regular |= ind->ref_regular; |
| 945 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; |
| 946 | dir->needs_plt |= ind->needs_plt; |
| 947 | dir->pointer_equality_needed |= ind->pointer_equality_needed; |
| 948 | } |
| 949 | else |
| 950 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); |
| 951 | } |
| 952 | |
| 953 | typedef union |
| 954 | { |
| 955 | unsigned char c[2]; |
| 956 | uint16_t i; |
| 957 | } |
| 958 | i386_opcode16; |
| 959 | |
| 960 | /* Return TRUE if the TLS access code sequence support transition |
| 961 | from R_TYPE. */ |
| 962 | |
| 963 | static bfd_boolean |
| 964 | elf_i386_check_tls_transition (bfd *abfd, asection *sec, |
| 965 | bfd_byte *contents, |
| 966 | Elf_Internal_Shdr *symtab_hdr, |
| 967 | struct elf_link_hash_entry **sym_hashes, |
| 968 | unsigned int r_type, |
| 969 | const Elf_Internal_Rela *rel, |
| 970 | const Elf_Internal_Rela *relend) |
| 971 | { |
| 972 | unsigned int val, type; |
| 973 | unsigned long r_symndx; |
| 974 | struct elf_link_hash_entry *h; |
| 975 | bfd_vma offset; |
| 976 | |
| 977 | /* Get the section contents. */ |
| 978 | if (contents == NULL) |
| 979 | { |
| 980 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 981 | contents = elf_section_data (sec)->this_hdr.contents; |
| 982 | else |
| 983 | { |
| 984 | /* FIXME: How to better handle error condition? */ |
| 985 | if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 986 | return FALSE; |
| 987 | |
| 988 | /* Cache the section contents for elf_link_input_bfd. */ |
| 989 | elf_section_data (sec)->this_hdr.contents = contents; |
| 990 | } |
| 991 | } |
| 992 | |
| 993 | offset = rel->r_offset; |
| 994 | switch (r_type) |
| 995 | { |
| 996 | case R_386_TLS_GD: |
| 997 | case R_386_TLS_LDM: |
| 998 | if (offset < 2 || (rel + 1) >= relend) |
| 999 | return FALSE; |
| 1000 | |
| 1001 | type = bfd_get_8 (abfd, contents + offset - 2); |
| 1002 | if (r_type == R_386_TLS_GD) |
| 1003 | { |
| 1004 | /* Check transition from GD access model. Only |
| 1005 | leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr |
| 1006 | leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop |
| 1007 | can transit to different access model. */ |
| 1008 | if ((offset + 10) > sec->size || |
| 1009 | (type != 0x8d && type != 0x04)) |
| 1010 | return FALSE; |
| 1011 | |
| 1012 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1013 | if (type == 0x04) |
| 1014 | { |
| 1015 | /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */ |
| 1016 | if (offset < 3) |
| 1017 | return FALSE; |
| 1018 | |
| 1019 | if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d) |
| 1020 | return FALSE; |
| 1021 | |
| 1022 | if ((val & 0xc7) != 0x05 || val == (4 << 3)) |
| 1023 | return FALSE; |
| 1024 | } |
| 1025 | else |
| 1026 | { |
| 1027 | /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */ |
| 1028 | if ((val & 0xf8) != 0x80 || (val & 7) == 4) |
| 1029 | return FALSE; |
| 1030 | |
| 1031 | if (bfd_get_8 (abfd, contents + offset + 9) != 0x90) |
| 1032 | return FALSE; |
| 1033 | } |
| 1034 | } |
| 1035 | else |
| 1036 | { |
| 1037 | /* Check transition from LD access model. Only |
| 1038 | leal foo@tlsgd(%reg), %eax; call ___tls_get_addr |
| 1039 | can transit to different access model. */ |
| 1040 | if (type != 0x8d || (offset + 9) > sec->size) |
| 1041 | return FALSE; |
| 1042 | |
| 1043 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1044 | if ((val & 0xf8) != 0x80 || (val & 7) == 4) |
| 1045 | return FALSE; |
| 1046 | } |
| 1047 | |
| 1048 | if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8) |
| 1049 | return FALSE; |
| 1050 | |
| 1051 | r_symndx = ELF32_R_SYM (rel[1].r_info); |
| 1052 | if (r_symndx < symtab_hdr->sh_info) |
| 1053 | return FALSE; |
| 1054 | |
| 1055 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1056 | /* Use strncmp to check ___tls_get_addr since ___tls_get_addr |
| 1057 | may be versioned. */ |
| 1058 | return (h != NULL |
| 1059 | && h->root.root.string != NULL |
| 1060 | && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32 |
| 1061 | || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32) |
| 1062 | && (strncmp (h->root.root.string, "___tls_get_addr", |
| 1063 | 15) == 0)); |
| 1064 | |
| 1065 | case R_386_TLS_IE: |
| 1066 | /* Check transition from IE access model: |
| 1067 | movl foo@indntpoff(%rip), %eax |
| 1068 | movl foo@indntpoff(%rip), %reg |
| 1069 | addl foo@indntpoff(%rip), %reg |
| 1070 | */ |
| 1071 | |
| 1072 | if (offset < 1 || (offset + 4) > sec->size) |
| 1073 | return FALSE; |
| 1074 | |
| 1075 | /* Check "movl foo@tpoff(%rip), %eax" first. */ |
| 1076 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1077 | if (val == 0xa1) |
| 1078 | return TRUE; |
| 1079 | |
| 1080 | if (offset < 2) |
| 1081 | return FALSE; |
| 1082 | |
| 1083 | /* Check movl|addl foo@tpoff(%rip), %reg. */ |
| 1084 | type = bfd_get_8 (abfd, contents + offset - 2); |
| 1085 | return ((type == 0x8b || type == 0x03) |
| 1086 | && (val & 0xc7) == 0x05); |
| 1087 | |
| 1088 | case R_386_TLS_GOTIE: |
| 1089 | case R_386_TLS_IE_32: |
| 1090 | /* Check transition from {IE_32,GOTIE} access model: |
| 1091 | subl foo@{tpoff,gontoff}(%reg1), %reg2 |
| 1092 | movl foo@{tpoff,gontoff}(%reg1), %reg2 |
| 1093 | addl foo@{tpoff,gontoff}(%reg1), %reg2 |
| 1094 | */ |
| 1095 | |
| 1096 | if (offset < 2 || (offset + 4) > sec->size) |
| 1097 | return FALSE; |
| 1098 | |
| 1099 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1100 | if ((val & 0xc0) != 0x80 || (val & 7) == 4) |
| 1101 | return FALSE; |
| 1102 | |
| 1103 | type = bfd_get_8 (abfd, contents + offset - 2); |
| 1104 | return type == 0x8b || type == 0x2b || type == 0x03; |
| 1105 | |
| 1106 | case R_386_TLS_GOTDESC: |
| 1107 | /* Check transition from GDesc access model: |
| 1108 | leal x@tlsdesc(%ebx), %eax |
| 1109 | |
| 1110 | Make sure it's a leal adding ebx to a 32-bit offset |
| 1111 | into any register, although it's probably almost always |
| 1112 | going to be eax. */ |
| 1113 | |
| 1114 | if (offset < 2 || (offset + 4) > sec->size) |
| 1115 | return FALSE; |
| 1116 | |
| 1117 | if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) |
| 1118 | return FALSE; |
| 1119 | |
| 1120 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1121 | return (val & 0xc7) == 0x83; |
| 1122 | |
| 1123 | case R_386_TLS_DESC_CALL: |
| 1124 | /* Check transition from GDesc access model: |
| 1125 | call *x@tlsdesc(%rax) |
| 1126 | */ |
| 1127 | if (offset + 2 <= sec->size) |
| 1128 | { |
| 1129 | /* Make sure that it's a call *x@tlsdesc(%rax). */ |
| 1130 | static i386_opcode16 call = { { 0xff, 0x10 } }; |
| 1131 | return bfd_get_16 (abfd, contents + offset) == call.i; |
| 1132 | } |
| 1133 | |
| 1134 | return FALSE; |
| 1135 | |
| 1136 | default: |
| 1137 | abort (); |
| 1138 | } |
| 1139 | } |
| 1140 | |
| 1141 | /* Return TRUE if the TLS access transition is OK or no transition |
| 1142 | will be performed. Update R_TYPE if there is a transition. */ |
| 1143 | |
| 1144 | static bfd_boolean |
| 1145 | elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd, |
| 1146 | asection *sec, bfd_byte *contents, |
| 1147 | Elf_Internal_Shdr *symtab_hdr, |
| 1148 | struct elf_link_hash_entry **sym_hashes, |
| 1149 | unsigned int *r_type, int tls_type, |
| 1150 | const Elf_Internal_Rela *rel, |
| 1151 | const Elf_Internal_Rela *relend, |
| 1152 | struct elf_link_hash_entry *h, |
| 1153 | unsigned long r_symndx) |
| 1154 | { |
| 1155 | unsigned int from_type = *r_type; |
| 1156 | unsigned int to_type = from_type; |
| 1157 | bfd_boolean check = TRUE; |
| 1158 | |
| 1159 | switch (from_type) |
| 1160 | { |
| 1161 | case R_386_TLS_GD: |
| 1162 | case R_386_TLS_GOTDESC: |
| 1163 | case R_386_TLS_DESC_CALL: |
| 1164 | case R_386_TLS_IE_32: |
| 1165 | case R_386_TLS_IE: |
| 1166 | case R_386_TLS_GOTIE: |
| 1167 | if (info->executable) |
| 1168 | { |
| 1169 | if (h == NULL) |
| 1170 | to_type = R_386_TLS_LE_32; |
| 1171 | else if (from_type != R_386_TLS_IE |
| 1172 | && from_type != R_386_TLS_GOTIE) |
| 1173 | to_type = R_386_TLS_IE_32; |
| 1174 | } |
| 1175 | |
| 1176 | /* When we are called from elf_i386_relocate_section, CONTENTS |
| 1177 | isn't NULL and there may be additional transitions based on |
| 1178 | TLS_TYPE. */ |
| 1179 | if (contents != NULL) |
| 1180 | { |
| 1181 | unsigned int new_to_type = to_type; |
| 1182 | |
| 1183 | if (info->executable |
| 1184 | && h != NULL |
| 1185 | && h->dynindx == -1 |
| 1186 | && (tls_type & GOT_TLS_IE)) |
| 1187 | new_to_type = R_386_TLS_LE_32; |
| 1188 | |
| 1189 | if (to_type == R_386_TLS_GD |
| 1190 | || to_type == R_386_TLS_GOTDESC |
| 1191 | || to_type == R_386_TLS_DESC_CALL) |
| 1192 | { |
| 1193 | if (tls_type == GOT_TLS_IE_POS) |
| 1194 | new_to_type = R_386_TLS_GOTIE; |
| 1195 | else if (tls_type & GOT_TLS_IE) |
| 1196 | new_to_type = R_386_TLS_IE_32; |
| 1197 | } |
| 1198 | |
| 1199 | /* We checked the transition before when we were called from |
| 1200 | elf_i386_check_relocs. We only want to check the new |
| 1201 | transition which hasn't been checked before. */ |
| 1202 | check = new_to_type != to_type && from_type == to_type; |
| 1203 | to_type = new_to_type; |
| 1204 | } |
| 1205 | |
| 1206 | break; |
| 1207 | |
| 1208 | case R_386_TLS_LDM: |
| 1209 | if (info->executable) |
| 1210 | to_type = R_386_TLS_LE_32; |
| 1211 | break; |
| 1212 | |
| 1213 | default: |
| 1214 | return TRUE; |
| 1215 | } |
| 1216 | |
| 1217 | /* Return TRUE if there is no transition. */ |
| 1218 | if (from_type == to_type) |
| 1219 | return TRUE; |
| 1220 | |
| 1221 | /* Check if the transition can be performed. */ |
| 1222 | if (check |
| 1223 | && ! elf_i386_check_tls_transition (abfd, sec, contents, |
| 1224 | symtab_hdr, sym_hashes, |
| 1225 | from_type, rel, relend)) |
| 1226 | { |
| 1227 | reloc_howto_type *from, *to; |
| 1228 | const char *name; |
| 1229 | |
| 1230 | from = elf_i386_rtype_to_howto (abfd, from_type); |
| 1231 | to = elf_i386_rtype_to_howto (abfd, to_type); |
| 1232 | |
| 1233 | if (h) |
| 1234 | name = h->root.root.string; |
| 1235 | else |
| 1236 | { |
| 1237 | Elf_Internal_Sym *isym; |
| 1238 | struct elf_i386_link_hash_table *htab; |
| 1239 | htab = elf_i386_hash_table (info); |
| 1240 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1241 | abfd, r_symndx); |
| 1242 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); |
| 1243 | } |
| 1244 | |
| 1245 | (*_bfd_error_handler) |
| 1246 | (_("%B: TLS transition from %s to %s against `%s' at 0x%lx " |
| 1247 | "in section `%A' failed"), |
| 1248 | abfd, sec, from->name, to->name, name, |
| 1249 | (unsigned long) rel->r_offset); |
| 1250 | bfd_set_error (bfd_error_bad_value); |
| 1251 | return FALSE; |
| 1252 | } |
| 1253 | |
| 1254 | *r_type = to_type; |
| 1255 | return TRUE; |
| 1256 | } |
| 1257 | |
| 1258 | /* Look through the relocs for a section during the first phase, and |
| 1259 | calculate needed space in the global offset table, procedure linkage |
| 1260 | table, and dynamic reloc sections. */ |
| 1261 | |
| 1262 | static bfd_boolean |
| 1263 | elf_i386_check_relocs (bfd *abfd, |
| 1264 | struct bfd_link_info *info, |
| 1265 | asection *sec, |
| 1266 | const Elf_Internal_Rela *relocs) |
| 1267 | { |
| 1268 | struct elf_i386_link_hash_table *htab; |
| 1269 | Elf_Internal_Shdr *symtab_hdr; |
| 1270 | struct elf_link_hash_entry **sym_hashes; |
| 1271 | const Elf_Internal_Rela *rel; |
| 1272 | const Elf_Internal_Rela *rel_end; |
| 1273 | asection *sreloc; |
| 1274 | |
| 1275 | if (info->relocatable) |
| 1276 | return TRUE; |
| 1277 | |
| 1278 | BFD_ASSERT (is_i386_elf (abfd)); |
| 1279 | |
| 1280 | htab = elf_i386_hash_table (info); |
| 1281 | symtab_hdr = &elf_symtab_hdr (abfd); |
| 1282 | sym_hashes = elf_sym_hashes (abfd); |
| 1283 | |
| 1284 | sreloc = NULL; |
| 1285 | |
| 1286 | rel_end = relocs + sec->reloc_count; |
| 1287 | for (rel = relocs; rel < rel_end; rel++) |
| 1288 | { |
| 1289 | unsigned int r_type; |
| 1290 | unsigned long r_symndx; |
| 1291 | struct elf_link_hash_entry *h; |
| 1292 | Elf_Internal_Sym *isym; |
| 1293 | const char *name; |
| 1294 | |
| 1295 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1296 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1297 | |
| 1298 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 1299 | { |
| 1300 | (*_bfd_error_handler) (_("%B: bad symbol index: %d"), |
| 1301 | abfd, |
| 1302 | r_symndx); |
| 1303 | return FALSE; |
| 1304 | } |
| 1305 | |
| 1306 | if (r_symndx < symtab_hdr->sh_info) |
| 1307 | { |
| 1308 | /* A local symbol. */ |
| 1309 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1310 | abfd, r_symndx); |
| 1311 | if (isym == NULL) |
| 1312 | return FALSE; |
| 1313 | |
| 1314 | /* Check relocation against local STT_GNU_IFUNC symbol. */ |
| 1315 | if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) |
| 1316 | { |
| 1317 | h = elf_i386_get_local_sym_hash (htab, abfd, rel, |
| 1318 | TRUE); |
| 1319 | if (h == NULL) |
| 1320 | return FALSE; |
| 1321 | |
| 1322 | /* Fake a STT_GNU_IFUNC symbol. */ |
| 1323 | h->type = STT_GNU_IFUNC; |
| 1324 | h->def_regular = 1; |
| 1325 | h->ref_regular = 1; |
| 1326 | h->forced_local = 1; |
| 1327 | h->root.type = bfd_link_hash_defined; |
| 1328 | } |
| 1329 | else |
| 1330 | h = NULL; |
| 1331 | } |
| 1332 | else |
| 1333 | { |
| 1334 | isym = NULL; |
| 1335 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1336 | while (h->root.type == bfd_link_hash_indirect |
| 1337 | || h->root.type == bfd_link_hash_warning) |
| 1338 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1339 | } |
| 1340 | |
| 1341 | if (h != NULL) |
| 1342 | { |
| 1343 | /* Create the ifunc sections for static executables. If we |
| 1344 | never see an indirect function symbol nor we are building |
| 1345 | a static executable, those sections will be empty and |
| 1346 | won't appear in output. */ |
| 1347 | switch (r_type) |
| 1348 | { |
| 1349 | default: |
| 1350 | break; |
| 1351 | |
| 1352 | case R_386_32: |
| 1353 | case R_386_PC32: |
| 1354 | case R_386_PLT32: |
| 1355 | case R_386_GOT32: |
| 1356 | case R_386_GOTOFF: |
| 1357 | if (!_bfd_elf_create_ifunc_sections (abfd, info)) |
| 1358 | return FALSE; |
| 1359 | break; |
| 1360 | } |
| 1361 | |
| 1362 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle |
| 1363 | it here if it is defined in a non-shared object. */ |
| 1364 | if (h->type == STT_GNU_IFUNC |
| 1365 | && h->def_regular) |
| 1366 | { |
| 1367 | /* It is referenced by a non-shared object. */ |
| 1368 | h->ref_regular = 1; |
| 1369 | h->needs_plt = 1; |
| 1370 | |
| 1371 | /* STT_GNU_IFUNC symbol must go through PLT. */ |
| 1372 | h->plt.refcount += 1; |
| 1373 | |
| 1374 | /* STT_GNU_IFUNC needs dynamic sections. */ |
| 1375 | if (htab->elf.dynobj == NULL) |
| 1376 | htab->elf.dynobj = abfd; |
| 1377 | |
| 1378 | switch (r_type) |
| 1379 | { |
| 1380 | default: |
| 1381 | if (h->root.root.string) |
| 1382 | name = h->root.root.string; |
| 1383 | else |
| 1384 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, |
| 1385 | NULL); |
| 1386 | (*_bfd_error_handler) |
| 1387 | (_("%B: relocation %s against STT_GNU_IFUNC " |
| 1388 | "symbol `%s' isn't handled by %s"), abfd, |
| 1389 | elf_howto_table[r_type].name, |
| 1390 | name, __FUNCTION__); |
| 1391 | bfd_set_error (bfd_error_bad_value); |
| 1392 | return FALSE; |
| 1393 | |
| 1394 | case R_386_32: |
| 1395 | h->non_got_ref = 1; |
| 1396 | h->pointer_equality_needed = 1; |
| 1397 | if (info->shared) |
| 1398 | { |
| 1399 | /* We must copy these reloc types into the |
| 1400 | output file. Create a reloc section in |
| 1401 | dynobj and make room for this reloc. */ |
| 1402 | sreloc = _bfd_elf_create_ifunc_dyn_reloc |
| 1403 | (abfd, info, sec, sreloc, |
| 1404 | &((struct elf_i386_link_hash_entry *) h)->dyn_relocs); |
| 1405 | if (sreloc == NULL) |
| 1406 | return FALSE; |
| 1407 | } |
| 1408 | break; |
| 1409 | |
| 1410 | case R_386_PC32: |
| 1411 | h->non_got_ref = 1; |
| 1412 | break; |
| 1413 | |
| 1414 | case R_386_PLT32: |
| 1415 | break; |
| 1416 | |
| 1417 | case R_386_GOT32: |
| 1418 | case R_386_GOTOFF: |
| 1419 | h->got.refcount += 1; |
| 1420 | if (htab->elf.sgot == NULL |
| 1421 | && !_bfd_elf_create_got_section (htab->elf.dynobj, |
| 1422 | info)) |
| 1423 | return FALSE; |
| 1424 | break; |
| 1425 | } |
| 1426 | |
| 1427 | continue; |
| 1428 | } |
| 1429 | } |
| 1430 | |
| 1431 | if (! elf_i386_tls_transition (info, abfd, sec, NULL, |
| 1432 | symtab_hdr, sym_hashes, |
| 1433 | &r_type, GOT_UNKNOWN, |
| 1434 | rel, rel_end, h, r_symndx)) |
| 1435 | return FALSE; |
| 1436 | |
| 1437 | switch (r_type) |
| 1438 | { |
| 1439 | case R_386_TLS_LDM: |
| 1440 | htab->tls_ldm_got.refcount += 1; |
| 1441 | goto create_got; |
| 1442 | |
| 1443 | case R_386_PLT32: |
| 1444 | /* This symbol requires a procedure linkage table entry. We |
| 1445 | actually build the entry in adjust_dynamic_symbol, |
| 1446 | because this might be a case of linking PIC code which is |
| 1447 | never referenced by a dynamic object, in which case we |
| 1448 | don't need to generate a procedure linkage table entry |
| 1449 | after all. */ |
| 1450 | |
| 1451 | /* If this is a local symbol, we resolve it directly without |
| 1452 | creating a procedure linkage table entry. */ |
| 1453 | if (h == NULL) |
| 1454 | continue; |
| 1455 | |
| 1456 | h->needs_plt = 1; |
| 1457 | h->plt.refcount += 1; |
| 1458 | break; |
| 1459 | |
| 1460 | case R_386_TLS_IE_32: |
| 1461 | case R_386_TLS_IE: |
| 1462 | case R_386_TLS_GOTIE: |
| 1463 | if (!info->executable) |
| 1464 | info->flags |= DF_STATIC_TLS; |
| 1465 | /* Fall through */ |
| 1466 | |
| 1467 | case R_386_GOT32: |
| 1468 | case R_386_TLS_GD: |
| 1469 | case R_386_TLS_GOTDESC: |
| 1470 | case R_386_TLS_DESC_CALL: |
| 1471 | /* This symbol requires a global offset table entry. */ |
| 1472 | { |
| 1473 | int tls_type, old_tls_type; |
| 1474 | |
| 1475 | switch (r_type) |
| 1476 | { |
| 1477 | default: |
| 1478 | case R_386_GOT32: tls_type = GOT_NORMAL; break; |
| 1479 | case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; |
| 1480 | case R_386_TLS_GOTDESC: |
| 1481 | case R_386_TLS_DESC_CALL: |
| 1482 | tls_type = GOT_TLS_GDESC; break; |
| 1483 | case R_386_TLS_IE_32: |
| 1484 | if (ELF32_R_TYPE (rel->r_info) == r_type) |
| 1485 | tls_type = GOT_TLS_IE_NEG; |
| 1486 | else |
| 1487 | /* If this is a GD->IE transition, we may use either of |
| 1488 | R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ |
| 1489 | tls_type = GOT_TLS_IE; |
| 1490 | break; |
| 1491 | case R_386_TLS_IE: |
| 1492 | case R_386_TLS_GOTIE: |
| 1493 | tls_type = GOT_TLS_IE_POS; break; |
| 1494 | } |
| 1495 | |
| 1496 | if (h != NULL) |
| 1497 | { |
| 1498 | h->got.refcount += 1; |
| 1499 | old_tls_type = elf_i386_hash_entry(h)->tls_type; |
| 1500 | } |
| 1501 | else |
| 1502 | { |
| 1503 | bfd_signed_vma *local_got_refcounts; |
| 1504 | |
| 1505 | /* This is a global offset table entry for a local symbol. */ |
| 1506 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1507 | if (local_got_refcounts == NULL) |
| 1508 | { |
| 1509 | bfd_size_type size; |
| 1510 | |
| 1511 | size = symtab_hdr->sh_info; |
| 1512 | size *= (sizeof (bfd_signed_vma) |
| 1513 | + sizeof (bfd_vma) + sizeof(char)); |
| 1514 | local_got_refcounts = bfd_zalloc (abfd, size); |
| 1515 | if (local_got_refcounts == NULL) |
| 1516 | return FALSE; |
| 1517 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 1518 | elf_i386_local_tlsdesc_gotent (abfd) |
| 1519 | = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); |
| 1520 | elf_i386_local_got_tls_type (abfd) |
| 1521 | = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); |
| 1522 | } |
| 1523 | local_got_refcounts[r_symndx] += 1; |
| 1524 | old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx]; |
| 1525 | } |
| 1526 | |
| 1527 | if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) |
| 1528 | tls_type |= old_tls_type; |
| 1529 | /* If a TLS symbol is accessed using IE at least once, |
| 1530 | there is no point to use dynamic model for it. */ |
| 1531 | else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN |
| 1532 | && (! GOT_TLS_GD_ANY_P (old_tls_type) |
| 1533 | || (tls_type & GOT_TLS_IE) == 0)) |
| 1534 | { |
| 1535 | if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type)) |
| 1536 | tls_type = old_tls_type; |
| 1537 | else if (GOT_TLS_GD_ANY_P (old_tls_type) |
| 1538 | && GOT_TLS_GD_ANY_P (tls_type)) |
| 1539 | tls_type |= old_tls_type; |
| 1540 | else |
| 1541 | { |
| 1542 | if (h) |
| 1543 | name = h->root.root.string; |
| 1544 | else |
| 1545 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, |
| 1546 | NULL); |
| 1547 | (*_bfd_error_handler) |
| 1548 | (_("%B: `%s' accessed both as normal and " |
| 1549 | "thread local symbol"), |
| 1550 | abfd, name); |
| 1551 | return FALSE; |
| 1552 | } |
| 1553 | } |
| 1554 | |
| 1555 | if (old_tls_type != tls_type) |
| 1556 | { |
| 1557 | if (h != NULL) |
| 1558 | elf_i386_hash_entry (h)->tls_type = tls_type; |
| 1559 | else |
| 1560 | elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type; |
| 1561 | } |
| 1562 | } |
| 1563 | /* Fall through */ |
| 1564 | |
| 1565 | case R_386_GOTOFF: |
| 1566 | case R_386_GOTPC: |
| 1567 | create_got: |
| 1568 | if (htab->elf.sgot == NULL) |
| 1569 | { |
| 1570 | if (htab->elf.dynobj == NULL) |
| 1571 | htab->elf.dynobj = abfd; |
| 1572 | if (!_bfd_elf_create_got_section (htab->elf.dynobj, info)) |
| 1573 | return FALSE; |
| 1574 | } |
| 1575 | if (r_type != R_386_TLS_IE) |
| 1576 | break; |
| 1577 | /* Fall through */ |
| 1578 | |
| 1579 | case R_386_TLS_LE_32: |
| 1580 | case R_386_TLS_LE: |
| 1581 | if (info->executable) |
| 1582 | break; |
| 1583 | info->flags |= DF_STATIC_TLS; |
| 1584 | /* Fall through */ |
| 1585 | |
| 1586 | case R_386_32: |
| 1587 | case R_386_PC32: |
| 1588 | if (h != NULL && info->executable) |
| 1589 | { |
| 1590 | /* If this reloc is in a read-only section, we might |
| 1591 | need a copy reloc. We can't check reliably at this |
| 1592 | stage whether the section is read-only, as input |
| 1593 | sections have not yet been mapped to output sections. |
| 1594 | Tentatively set the flag for now, and correct in |
| 1595 | adjust_dynamic_symbol. */ |
| 1596 | h->non_got_ref = 1; |
| 1597 | |
| 1598 | /* We may need a .plt entry if the function this reloc |
| 1599 | refers to is in a shared lib. */ |
| 1600 | h->plt.refcount += 1; |
| 1601 | if (r_type != R_386_PC32) |
| 1602 | h->pointer_equality_needed = 1; |
| 1603 | } |
| 1604 | |
| 1605 | /* If we are creating a shared library, and this is a reloc |
| 1606 | against a global symbol, or a non PC relative reloc |
| 1607 | against a local symbol, then we need to copy the reloc |
| 1608 | into the shared library. However, if we are linking with |
| 1609 | -Bsymbolic, we do not need to copy a reloc against a |
| 1610 | global symbol which is defined in an object we are |
| 1611 | including in the link (i.e., DEF_REGULAR is set). At |
| 1612 | this point we have not seen all the input files, so it is |
| 1613 | possible that DEF_REGULAR is not set now but will be set |
| 1614 | later (it is never cleared). In case of a weak definition, |
| 1615 | DEF_REGULAR may be cleared later by a strong definition in |
| 1616 | a shared library. We account for that possibility below by |
| 1617 | storing information in the relocs_copied field of the hash |
| 1618 | table entry. A similar situation occurs when creating |
| 1619 | shared libraries and symbol visibility changes render the |
| 1620 | symbol local. |
| 1621 | |
| 1622 | If on the other hand, we are creating an executable, we |
| 1623 | may need to keep relocations for symbols satisfied by a |
| 1624 | dynamic library if we manage to avoid copy relocs for the |
| 1625 | symbol. */ |
| 1626 | if ((info->shared |
| 1627 | && (sec->flags & SEC_ALLOC) != 0 |
| 1628 | && (r_type != R_386_PC32 |
| 1629 | || (h != NULL |
| 1630 | && (! SYMBOLIC_BIND (info, h) |
| 1631 | || h->root.type == bfd_link_hash_defweak |
| 1632 | || !h->def_regular)))) |
| 1633 | || (ELIMINATE_COPY_RELOCS |
| 1634 | && !info->shared |
| 1635 | && (sec->flags & SEC_ALLOC) != 0 |
| 1636 | && h != NULL |
| 1637 | && (h->root.type == bfd_link_hash_defweak |
| 1638 | || !h->def_regular))) |
| 1639 | { |
| 1640 | struct elf_dyn_relocs *p; |
| 1641 | struct elf_dyn_relocs **head; |
| 1642 | |
| 1643 | /* We must copy these reloc types into the output file. |
| 1644 | Create a reloc section in dynobj and make room for |
| 1645 | this reloc. */ |
| 1646 | if (sreloc == NULL) |
| 1647 | { |
| 1648 | if (htab->elf.dynobj == NULL) |
| 1649 | htab->elf.dynobj = abfd; |
| 1650 | |
| 1651 | sreloc = _bfd_elf_make_dynamic_reloc_section |
| 1652 | (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE); |
| 1653 | |
| 1654 | if (sreloc == NULL) |
| 1655 | return FALSE; |
| 1656 | } |
| 1657 | |
| 1658 | /* If this is a global symbol, we count the number of |
| 1659 | relocations we need for this symbol. */ |
| 1660 | if (h != NULL) |
| 1661 | { |
| 1662 | head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs; |
| 1663 | } |
| 1664 | else |
| 1665 | { |
| 1666 | /* Track dynamic relocs needed for local syms too. |
| 1667 | We really need local syms available to do this |
| 1668 | easily. Oh well. */ |
| 1669 | void **vpp; |
| 1670 | asection *s; |
| 1671 | Elf_Internal_Sym *isym; |
| 1672 | |
| 1673 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1674 | abfd, r_symndx); |
| 1675 | if (isym == NULL) |
| 1676 | return FALSE; |
| 1677 | |
| 1678 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 1679 | if (s == NULL) |
| 1680 | s = sec; |
| 1681 | |
| 1682 | vpp = &elf_section_data (s)->local_dynrel; |
| 1683 | head = (struct elf_dyn_relocs **)vpp; |
| 1684 | } |
| 1685 | |
| 1686 | p = *head; |
| 1687 | if (p == NULL || p->sec != sec) |
| 1688 | { |
| 1689 | bfd_size_type amt = sizeof *p; |
| 1690 | p = bfd_alloc (htab->elf.dynobj, amt); |
| 1691 | if (p == NULL) |
| 1692 | return FALSE; |
| 1693 | p->next = *head; |
| 1694 | *head = p; |
| 1695 | p->sec = sec; |
| 1696 | p->count = 0; |
| 1697 | p->pc_count = 0; |
| 1698 | } |
| 1699 | |
| 1700 | p->count += 1; |
| 1701 | if (r_type == R_386_PC32) |
| 1702 | p->pc_count += 1; |
| 1703 | } |
| 1704 | break; |
| 1705 | |
| 1706 | /* This relocation describes the C++ object vtable hierarchy. |
| 1707 | Reconstruct it for later use during GC. */ |
| 1708 | case R_386_GNU_VTINHERIT: |
| 1709 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 1710 | return FALSE; |
| 1711 | break; |
| 1712 | |
| 1713 | /* This relocation describes which C++ vtable entries are actually |
| 1714 | used. Record for later use during GC. */ |
| 1715 | case R_386_GNU_VTENTRY: |
| 1716 | BFD_ASSERT (h != NULL); |
| 1717 | if (h != NULL |
| 1718 | && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
| 1719 | return FALSE; |
| 1720 | break; |
| 1721 | |
| 1722 | default: |
| 1723 | break; |
| 1724 | } |
| 1725 | } |
| 1726 | |
| 1727 | return TRUE; |
| 1728 | } |
| 1729 | |
| 1730 | /* Return the section that should be marked against GC for a given |
| 1731 | relocation. */ |
| 1732 | |
| 1733 | static asection * |
| 1734 | elf_i386_gc_mark_hook (asection *sec, |
| 1735 | struct bfd_link_info *info, |
| 1736 | Elf_Internal_Rela *rel, |
| 1737 | struct elf_link_hash_entry *h, |
| 1738 | Elf_Internal_Sym *sym) |
| 1739 | { |
| 1740 | if (h != NULL) |
| 1741 | switch (ELF32_R_TYPE (rel->r_info)) |
| 1742 | { |
| 1743 | case R_386_GNU_VTINHERIT: |
| 1744 | case R_386_GNU_VTENTRY: |
| 1745 | return NULL; |
| 1746 | } |
| 1747 | |
| 1748 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 1749 | } |
| 1750 | |
| 1751 | /* Update the got entry reference counts for the section being removed. */ |
| 1752 | |
| 1753 | static bfd_boolean |
| 1754 | elf_i386_gc_sweep_hook (bfd *abfd, |
| 1755 | struct bfd_link_info *info, |
| 1756 | asection *sec, |
| 1757 | const Elf_Internal_Rela *relocs) |
| 1758 | { |
| 1759 | Elf_Internal_Shdr *symtab_hdr; |
| 1760 | struct elf_link_hash_entry **sym_hashes; |
| 1761 | bfd_signed_vma *local_got_refcounts; |
| 1762 | const Elf_Internal_Rela *rel, *relend; |
| 1763 | |
| 1764 | if (info->relocatable) |
| 1765 | return TRUE; |
| 1766 | |
| 1767 | elf_section_data (sec)->local_dynrel = NULL; |
| 1768 | |
| 1769 | symtab_hdr = &elf_symtab_hdr (abfd); |
| 1770 | sym_hashes = elf_sym_hashes (abfd); |
| 1771 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1772 | |
| 1773 | relend = relocs + sec->reloc_count; |
| 1774 | for (rel = relocs; rel < relend; rel++) |
| 1775 | { |
| 1776 | unsigned long r_symndx; |
| 1777 | unsigned int r_type; |
| 1778 | struct elf_link_hash_entry *h = NULL; |
| 1779 | |
| 1780 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1781 | if (r_symndx >= symtab_hdr->sh_info) |
| 1782 | { |
| 1783 | struct elf_i386_link_hash_entry *eh; |
| 1784 | struct elf_dyn_relocs **pp; |
| 1785 | struct elf_dyn_relocs *p; |
| 1786 | |
| 1787 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1788 | while (h->root.type == bfd_link_hash_indirect |
| 1789 | || h->root.type == bfd_link_hash_warning) |
| 1790 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1791 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1792 | |
| 1793 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| 1794 | if (p->sec == sec) |
| 1795 | { |
| 1796 | /* Everything must go for SEC. */ |
| 1797 | *pp = p->next; |
| 1798 | break; |
| 1799 | } |
| 1800 | } |
| 1801 | |
| 1802 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1803 | if (! elf_i386_tls_transition (info, abfd, sec, NULL, |
| 1804 | symtab_hdr, sym_hashes, |
| 1805 | &r_type, GOT_UNKNOWN, |
| 1806 | rel, relend, h, r_symndx)) |
| 1807 | return FALSE; |
| 1808 | |
| 1809 | switch (r_type) |
| 1810 | { |
| 1811 | case R_386_TLS_LDM: |
| 1812 | if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0) |
| 1813 | elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1; |
| 1814 | break; |
| 1815 | |
| 1816 | case R_386_TLS_GD: |
| 1817 | case R_386_TLS_GOTDESC: |
| 1818 | case R_386_TLS_DESC_CALL: |
| 1819 | case R_386_TLS_IE_32: |
| 1820 | case R_386_TLS_IE: |
| 1821 | case R_386_TLS_GOTIE: |
| 1822 | case R_386_GOT32: |
| 1823 | if (h != NULL) |
| 1824 | { |
| 1825 | if (h->got.refcount > 0) |
| 1826 | h->got.refcount -= 1; |
| 1827 | } |
| 1828 | else if (local_got_refcounts != NULL) |
| 1829 | { |
| 1830 | if (local_got_refcounts[r_symndx] > 0) |
| 1831 | local_got_refcounts[r_symndx] -= 1; |
| 1832 | } |
| 1833 | break; |
| 1834 | |
| 1835 | case R_386_32: |
| 1836 | case R_386_PC32: |
| 1837 | if (info->shared) |
| 1838 | break; |
| 1839 | /* Fall through */ |
| 1840 | |
| 1841 | case R_386_PLT32: |
| 1842 | if (h != NULL) |
| 1843 | { |
| 1844 | if (h->plt.refcount > 0) |
| 1845 | h->plt.refcount -= 1; |
| 1846 | } |
| 1847 | break; |
| 1848 | |
| 1849 | default: |
| 1850 | break; |
| 1851 | } |
| 1852 | } |
| 1853 | |
| 1854 | return TRUE; |
| 1855 | } |
| 1856 | |
| 1857 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 1858 | regular object. The current definition is in some section of the |
| 1859 | dynamic object, but we're not including those sections. We have to |
| 1860 | change the definition to something the rest of the link can |
| 1861 | understand. */ |
| 1862 | |
| 1863 | static bfd_boolean |
| 1864 | elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info, |
| 1865 | struct elf_link_hash_entry *h) |
| 1866 | { |
| 1867 | struct elf_i386_link_hash_table *htab; |
| 1868 | asection *s; |
| 1869 | |
| 1870 | /* STT_GNU_IFUNC symbol must go through PLT. */ |
| 1871 | if (h->type == STT_GNU_IFUNC) |
| 1872 | { |
| 1873 | if (h->plt.refcount <= 0) |
| 1874 | { |
| 1875 | h->plt.offset = (bfd_vma) -1; |
| 1876 | h->needs_plt = 0; |
| 1877 | } |
| 1878 | return TRUE; |
| 1879 | } |
| 1880 | |
| 1881 | /* If this is a function, put it in the procedure linkage table. We |
| 1882 | will fill in the contents of the procedure linkage table later, |
| 1883 | when we know the address of the .got section. */ |
| 1884 | if (h->type == STT_FUNC |
| 1885 | || h->needs_plt) |
| 1886 | { |
| 1887 | if (h->plt.refcount <= 0 |
| 1888 | || SYMBOL_CALLS_LOCAL (info, h) |
| 1889 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 1890 | && h->root.type == bfd_link_hash_undefweak)) |
| 1891 | { |
| 1892 | /* This case can occur if we saw a PLT32 reloc in an input |
| 1893 | file, but the symbol was never referred to by a dynamic |
| 1894 | object, or if all references were garbage collected. In |
| 1895 | such a case, we don't actually need to build a procedure |
| 1896 | linkage table, and we can just do a PC32 reloc instead. */ |
| 1897 | h->plt.offset = (bfd_vma) -1; |
| 1898 | h->needs_plt = 0; |
| 1899 | } |
| 1900 | |
| 1901 | return TRUE; |
| 1902 | } |
| 1903 | else |
| 1904 | /* It's possible that we incorrectly decided a .plt reloc was |
| 1905 | needed for an R_386_PC32 reloc to a non-function sym in |
| 1906 | check_relocs. We can't decide accurately between function and |
| 1907 | non-function syms in check-relocs; Objects loaded later in |
| 1908 | the link may change h->type. So fix it now. */ |
| 1909 | h->plt.offset = (bfd_vma) -1; |
| 1910 | |
| 1911 | /* If this is a weak symbol, and there is a real definition, the |
| 1912 | processor independent code will have arranged for us to see the |
| 1913 | real definition first, and we can just use the same value. */ |
| 1914 | if (h->u.weakdef != NULL) |
| 1915 | { |
| 1916 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined |
| 1917 | || h->u.weakdef->root.type == bfd_link_hash_defweak); |
| 1918 | h->root.u.def.section = h->u.weakdef->root.u.def.section; |
| 1919 | h->root.u.def.value = h->u.weakdef->root.u.def.value; |
| 1920 | if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) |
| 1921 | h->non_got_ref = h->u.weakdef->non_got_ref; |
| 1922 | return TRUE; |
| 1923 | } |
| 1924 | |
| 1925 | /* This is a reference to a symbol defined by a dynamic object which |
| 1926 | is not a function. */ |
| 1927 | |
| 1928 | /* If we are creating a shared library, we must presume that the |
| 1929 | only references to the symbol are via the global offset table. |
| 1930 | For such cases we need not do anything here; the relocations will |
| 1931 | be handled correctly by relocate_section. */ |
| 1932 | if (info->shared) |
| 1933 | return TRUE; |
| 1934 | |
| 1935 | /* If there are no references to this symbol that do not use the |
| 1936 | GOT, we don't need to generate a copy reloc. */ |
| 1937 | if (!h->non_got_ref) |
| 1938 | return TRUE; |
| 1939 | |
| 1940 | /* If -z nocopyreloc was given, we won't generate them either. */ |
| 1941 | if (info->nocopyreloc) |
| 1942 | { |
| 1943 | h->non_got_ref = 0; |
| 1944 | return TRUE; |
| 1945 | } |
| 1946 | |
| 1947 | htab = elf_i386_hash_table (info); |
| 1948 | |
| 1949 | /* If there aren't any dynamic relocs in read-only sections, then |
| 1950 | we can keep the dynamic relocs and avoid the copy reloc. This |
| 1951 | doesn't work on VxWorks, where we can not have dynamic relocations |
| 1952 | (other than copy and jump slot relocations) in an executable. */ |
| 1953 | if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks) |
| 1954 | { |
| 1955 | struct elf_i386_link_hash_entry * eh; |
| 1956 | struct elf_dyn_relocs *p; |
| 1957 | |
| 1958 | eh = (struct elf_i386_link_hash_entry *) h; |
| 1959 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1960 | { |
| 1961 | s = p->sec->output_section; |
| 1962 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1963 | break; |
| 1964 | } |
| 1965 | |
| 1966 | if (p == NULL) |
| 1967 | { |
| 1968 | h->non_got_ref = 0; |
| 1969 | return TRUE; |
| 1970 | } |
| 1971 | } |
| 1972 | |
| 1973 | if (h->size == 0) |
| 1974 | { |
| 1975 | (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), |
| 1976 | h->root.root.string); |
| 1977 | return TRUE; |
| 1978 | } |
| 1979 | |
| 1980 | /* We must allocate the symbol in our .dynbss section, which will |
| 1981 | become part of the .bss section of the executable. There will be |
| 1982 | an entry for this symbol in the .dynsym section. The dynamic |
| 1983 | object will contain position independent code, so all references |
| 1984 | from the dynamic object to this symbol will go through the global |
| 1985 | offset table. The dynamic linker will use the .dynsym entry to |
| 1986 | determine the address it must put in the global offset table, so |
| 1987 | both the dynamic object and the regular object will refer to the |
| 1988 | same memory location for the variable. */ |
| 1989 | |
| 1990 | /* We must generate a R_386_COPY reloc to tell the dynamic linker to |
| 1991 | copy the initial value out of the dynamic object and into the |
| 1992 | runtime process image. */ |
| 1993 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 1994 | { |
| 1995 | htab->srelbss->size += sizeof (Elf32_External_Rel); |
| 1996 | h->needs_copy = 1; |
| 1997 | } |
| 1998 | |
| 1999 | s = htab->sdynbss; |
| 2000 | |
| 2001 | return _bfd_elf_adjust_dynamic_copy (h, s); |
| 2002 | } |
| 2003 | |
| 2004 | /* Allocate space in .plt, .got and associated reloc sections for |
| 2005 | dynamic relocs. */ |
| 2006 | |
| 2007 | static bfd_boolean |
| 2008 | elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
| 2009 | { |
| 2010 | struct bfd_link_info *info; |
| 2011 | struct elf_i386_link_hash_table *htab; |
| 2012 | struct elf_i386_link_hash_entry *eh; |
| 2013 | struct elf_dyn_relocs *p; |
| 2014 | |
| 2015 | if (h->root.type == bfd_link_hash_indirect) |
| 2016 | return TRUE; |
| 2017 | |
| 2018 | if (h->root.type == bfd_link_hash_warning) |
| 2019 | /* When warning symbols are created, they **replace** the "real" |
| 2020 | entry in the hash table, thus we never get to see the real |
| 2021 | symbol in a hash traversal. So look at it now. */ |
| 2022 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2023 | eh = (struct elf_i386_link_hash_entry *) h; |
| 2024 | |
| 2025 | info = (struct bfd_link_info *) inf; |
| 2026 | htab = elf_i386_hash_table (info); |
| 2027 | |
| 2028 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it |
| 2029 | here if it is defined and referenced in a non-shared object. */ |
| 2030 | if (h->type == STT_GNU_IFUNC |
| 2031 | && h->def_regular) |
| 2032 | return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, |
| 2033 | &eh->dyn_relocs, |
| 2034 | PLT_ENTRY_SIZE, 4); |
| 2035 | else if (htab->elf.dynamic_sections_created |
| 2036 | && h->plt.refcount > 0) |
| 2037 | { |
| 2038 | /* Make sure this symbol is output as a dynamic symbol. |
| 2039 | Undefined weak syms won't yet be marked as dynamic. */ |
| 2040 | if (h->dynindx == -1 |
| 2041 | && !h->forced_local) |
| 2042 | { |
| 2043 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2044 | return FALSE; |
| 2045 | } |
| 2046 | |
| 2047 | if (info->shared |
| 2048 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) |
| 2049 | { |
| 2050 | asection *s = htab->elf.splt; |
| 2051 | |
| 2052 | /* If this is the first .plt entry, make room for the special |
| 2053 | first entry. */ |
| 2054 | if (s->size == 0) |
| 2055 | s->size += PLT_ENTRY_SIZE; |
| 2056 | |
| 2057 | h->plt.offset = s->size; |
| 2058 | |
| 2059 | /* If this symbol is not defined in a regular file, and we are |
| 2060 | not generating a shared library, then set the symbol to this |
| 2061 | location in the .plt. This is required to make function |
| 2062 | pointers compare as equal between the normal executable and |
| 2063 | the shared library. */ |
| 2064 | if (! info->shared |
| 2065 | && !h->def_regular) |
| 2066 | { |
| 2067 | h->root.u.def.section = s; |
| 2068 | h->root.u.def.value = h->plt.offset; |
| 2069 | } |
| 2070 | |
| 2071 | /* Make room for this entry. */ |
| 2072 | s->size += PLT_ENTRY_SIZE; |
| 2073 | |
| 2074 | /* We also need to make an entry in the .got.plt section, which |
| 2075 | will be placed in the .got section by the linker script. */ |
| 2076 | htab->elf.sgotplt->size += 4; |
| 2077 | |
| 2078 | /* We also need to make an entry in the .rel.plt section. */ |
| 2079 | htab->elf.srelplt->size += sizeof (Elf32_External_Rel); |
| 2080 | htab->next_tls_desc_index++; |
| 2081 | |
| 2082 | if (htab->is_vxworks && !info->shared) |
| 2083 | { |
| 2084 | /* VxWorks has a second set of relocations for each PLT entry |
| 2085 | in executables. They go in a separate relocation section, |
| 2086 | which is processed by the kernel loader. */ |
| 2087 | |
| 2088 | /* There are two relocations for the initial PLT entry: an |
| 2089 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an |
| 2090 | R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ |
| 2091 | |
| 2092 | if (h->plt.offset == PLT_ENTRY_SIZE) |
| 2093 | htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); |
| 2094 | |
| 2095 | /* There are two extra relocations for each subsequent PLT entry: |
| 2096 | an R_386_32 relocation for the GOT entry, and an R_386_32 |
| 2097 | relocation for the PLT entry. */ |
| 2098 | |
| 2099 | htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2); |
| 2100 | } |
| 2101 | } |
| 2102 | else |
| 2103 | { |
| 2104 | h->plt.offset = (bfd_vma) -1; |
| 2105 | h->needs_plt = 0; |
| 2106 | } |
| 2107 | } |
| 2108 | else |
| 2109 | { |
| 2110 | h->plt.offset = (bfd_vma) -1; |
| 2111 | h->needs_plt = 0; |
| 2112 | } |
| 2113 | |
| 2114 | eh->tlsdesc_got = (bfd_vma) -1; |
| 2115 | |
| 2116 | /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary, |
| 2117 | make it a R_386_TLS_LE_32 requiring no TLS entry. */ |
| 2118 | if (h->got.refcount > 0 |
| 2119 | && info->executable |
| 2120 | && h->dynindx == -1 |
| 2121 | && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE)) |
| 2122 | h->got.offset = (bfd_vma) -1; |
| 2123 | else if (h->got.refcount > 0) |
| 2124 | { |
| 2125 | asection *s; |
| 2126 | bfd_boolean dyn; |
| 2127 | int tls_type = elf_i386_hash_entry(h)->tls_type; |
| 2128 | |
| 2129 | /* Make sure this symbol is output as a dynamic symbol. |
| 2130 | Undefined weak syms won't yet be marked as dynamic. */ |
| 2131 | if (h->dynindx == -1 |
| 2132 | && !h->forced_local) |
| 2133 | { |
| 2134 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2135 | return FALSE; |
| 2136 | } |
| 2137 | |
| 2138 | s = htab->elf.sgot; |
| 2139 | if (GOT_TLS_GDESC_P (tls_type)) |
| 2140 | { |
| 2141 | eh->tlsdesc_got = htab->elf.sgotplt->size |
| 2142 | - elf_i386_compute_jump_table_size (htab); |
| 2143 | htab->elf.sgotplt->size += 8; |
| 2144 | h->got.offset = (bfd_vma) -2; |
| 2145 | } |
| 2146 | if (! GOT_TLS_GDESC_P (tls_type) |
| 2147 | || GOT_TLS_GD_P (tls_type)) |
| 2148 | { |
| 2149 | h->got.offset = s->size; |
| 2150 | s->size += 4; |
| 2151 | /* R_386_TLS_GD needs 2 consecutive GOT slots. */ |
| 2152 | if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH) |
| 2153 | s->size += 4; |
| 2154 | } |
| 2155 | dyn = htab->elf.dynamic_sections_created; |
| 2156 | /* R_386_TLS_IE_32 needs one dynamic relocation, |
| 2157 | R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, |
| 2158 | (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we |
| 2159 | need two), R_386_TLS_GD needs one if local symbol and two if |
| 2160 | global. */ |
| 2161 | if (tls_type == GOT_TLS_IE_BOTH) |
| 2162 | htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel); |
| 2163 | else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) |
| 2164 | || (tls_type & GOT_TLS_IE)) |
| 2165 | htab->elf.srelgot->size += sizeof (Elf32_External_Rel); |
| 2166 | else if (GOT_TLS_GD_P (tls_type)) |
| 2167 | htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel); |
| 2168 | else if (! GOT_TLS_GDESC_P (tls_type) |
| 2169 | && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2170 | || h->root.type != bfd_link_hash_undefweak) |
| 2171 | && (info->shared |
| 2172 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) |
| 2173 | htab->elf.srelgot->size += sizeof (Elf32_External_Rel); |
| 2174 | if (GOT_TLS_GDESC_P (tls_type)) |
| 2175 | htab->elf.srelplt->size += sizeof (Elf32_External_Rel); |
| 2176 | } |
| 2177 | else |
| 2178 | h->got.offset = (bfd_vma) -1; |
| 2179 | |
| 2180 | if (eh->dyn_relocs == NULL) |
| 2181 | return TRUE; |
| 2182 | |
| 2183 | /* In the shared -Bsymbolic case, discard space allocated for |
| 2184 | dynamic pc-relative relocs against symbols which turn out to be |
| 2185 | defined in regular objects. For the normal shared case, discard |
| 2186 | space for pc-relative relocs that have become local due to symbol |
| 2187 | visibility changes. */ |
| 2188 | |
| 2189 | if (info->shared) |
| 2190 | { |
| 2191 | /* The only reloc that uses pc_count is R_386_PC32, which will |
| 2192 | appear on a call or on something like ".long foo - .". We |
| 2193 | want calls to protected symbols to resolve directly to the |
| 2194 | function rather than going via the plt. If people want |
| 2195 | function pointer comparisons to work as expected then they |
| 2196 | should avoid writing assembly like ".long foo - .". */ |
| 2197 | if (SYMBOL_CALLS_LOCAL (info, h)) |
| 2198 | { |
| 2199 | struct elf_dyn_relocs **pp; |
| 2200 | |
| 2201 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 2202 | { |
| 2203 | p->count -= p->pc_count; |
| 2204 | p->pc_count = 0; |
| 2205 | if (p->count == 0) |
| 2206 | *pp = p->next; |
| 2207 | else |
| 2208 | pp = &p->next; |
| 2209 | } |
| 2210 | } |
| 2211 | |
| 2212 | if (htab->is_vxworks) |
| 2213 | { |
| 2214 | struct elf_dyn_relocs **pp; |
| 2215 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 2216 | { |
| 2217 | if (strcmp (p->sec->output_section->name, ".tls_vars") == 0) |
| 2218 | *pp = p->next; |
| 2219 | else |
| 2220 | pp = &p->next; |
| 2221 | } |
| 2222 | } |
| 2223 | |
| 2224 | /* Also discard relocs on undefined weak syms with non-default |
| 2225 | visibility. */ |
| 2226 | if (eh->dyn_relocs != NULL |
| 2227 | && h->root.type == bfd_link_hash_undefweak) |
| 2228 | { |
| 2229 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 2230 | eh->dyn_relocs = NULL; |
| 2231 | |
| 2232 | /* Make sure undefined weak symbols are output as a dynamic |
| 2233 | symbol in PIEs. */ |
| 2234 | else if (h->dynindx == -1 |
| 2235 | && !h->forced_local) |
| 2236 | { |
| 2237 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2238 | return FALSE; |
| 2239 | } |
| 2240 | } |
| 2241 | } |
| 2242 | else if (ELIMINATE_COPY_RELOCS) |
| 2243 | { |
| 2244 | /* For the non-shared case, discard space for relocs against |
| 2245 | symbols which turn out to need copy relocs or are not |
| 2246 | dynamic. */ |
| 2247 | |
| 2248 | if (!h->non_got_ref |
| 2249 | && ((h->def_dynamic |
| 2250 | && !h->def_regular) |
| 2251 | || (htab->elf.dynamic_sections_created |
| 2252 | && (h->root.type == bfd_link_hash_undefweak |
| 2253 | || h->root.type == bfd_link_hash_undefined)))) |
| 2254 | { |
| 2255 | /* Make sure this symbol is output as a dynamic symbol. |
| 2256 | Undefined weak syms won't yet be marked as dynamic. */ |
| 2257 | if (h->dynindx == -1 |
| 2258 | && !h->forced_local) |
| 2259 | { |
| 2260 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2261 | return FALSE; |
| 2262 | } |
| 2263 | |
| 2264 | /* If that succeeded, we know we'll be keeping all the |
| 2265 | relocs. */ |
| 2266 | if (h->dynindx != -1) |
| 2267 | goto keep; |
| 2268 | } |
| 2269 | |
| 2270 | eh->dyn_relocs = NULL; |
| 2271 | |
| 2272 | keep: ; |
| 2273 | } |
| 2274 | |
| 2275 | /* Finally, allocate space. */ |
| 2276 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 2277 | { |
| 2278 | asection *sreloc; |
| 2279 | |
| 2280 | sreloc = elf_section_data (p->sec)->sreloc; |
| 2281 | |
| 2282 | BFD_ASSERT (sreloc != NULL); |
| 2283 | sreloc->size += p->count * sizeof (Elf32_External_Rel); |
| 2284 | } |
| 2285 | |
| 2286 | return TRUE; |
| 2287 | } |
| 2288 | |
| 2289 | /* Allocate space in .plt, .got and associated reloc sections for |
| 2290 | local dynamic relocs. */ |
| 2291 | |
| 2292 | static bfd_boolean |
| 2293 | elf_i386_allocate_local_dynrelocs (void **slot, void *inf) |
| 2294 | { |
| 2295 | struct elf_link_hash_entry *h |
| 2296 | = (struct elf_link_hash_entry *) *slot; |
| 2297 | |
| 2298 | if (h->type != STT_GNU_IFUNC |
| 2299 | || !h->def_regular |
| 2300 | || !h->ref_regular |
| 2301 | || !h->forced_local |
| 2302 | || h->root.type != bfd_link_hash_defined) |
| 2303 | abort (); |
| 2304 | |
| 2305 | return elf_i386_allocate_dynrelocs (h, inf); |
| 2306 | } |
| 2307 | |
| 2308 | /* Find any dynamic relocs that apply to read-only sections. */ |
| 2309 | |
| 2310 | static bfd_boolean |
| 2311 | elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) |
| 2312 | { |
| 2313 | struct elf_i386_link_hash_entry *eh; |
| 2314 | struct elf_dyn_relocs *p; |
| 2315 | |
| 2316 | if (h->root.type == bfd_link_hash_warning) |
| 2317 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2318 | |
| 2319 | eh = (struct elf_i386_link_hash_entry *) h; |
| 2320 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 2321 | { |
| 2322 | asection *s = p->sec->output_section; |
| 2323 | |
| 2324 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 2325 | { |
| 2326 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 2327 | |
| 2328 | info->flags |= DF_TEXTREL; |
| 2329 | |
| 2330 | /* Not an error, just cut short the traversal. */ |
| 2331 | return FALSE; |
| 2332 | } |
| 2333 | } |
| 2334 | return TRUE; |
| 2335 | } |
| 2336 | |
| 2337 | /* Set the sizes of the dynamic sections. */ |
| 2338 | |
| 2339 | static bfd_boolean |
| 2340 | elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 2341 | struct bfd_link_info *info) |
| 2342 | { |
| 2343 | struct elf_i386_link_hash_table *htab; |
| 2344 | bfd *dynobj; |
| 2345 | asection *s; |
| 2346 | bfd_boolean relocs; |
| 2347 | bfd *ibfd; |
| 2348 | |
| 2349 | htab = elf_i386_hash_table (info); |
| 2350 | dynobj = htab->elf.dynobj; |
| 2351 | if (dynobj == NULL) |
| 2352 | abort (); |
| 2353 | |
| 2354 | if (htab->elf.dynamic_sections_created) |
| 2355 | { |
| 2356 | /* Set the contents of the .interp section to the interpreter. */ |
| 2357 | if (info->executable) |
| 2358 | { |
| 2359 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 2360 | if (s == NULL) |
| 2361 | abort (); |
| 2362 | s->size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 2363 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 2364 | } |
| 2365 | } |
| 2366 | |
| 2367 | /* Set up .got offsets for local syms, and space for local dynamic |
| 2368 | relocs. */ |
| 2369 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 2370 | { |
| 2371 | bfd_signed_vma *local_got; |
| 2372 | bfd_signed_vma *end_local_got; |
| 2373 | char *local_tls_type; |
| 2374 | bfd_vma *local_tlsdesc_gotent; |
| 2375 | bfd_size_type locsymcount; |
| 2376 | Elf_Internal_Shdr *symtab_hdr; |
| 2377 | asection *srel; |
| 2378 | |
| 2379 | if (! is_i386_elf (ibfd)) |
| 2380 | continue; |
| 2381 | |
| 2382 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 2383 | { |
| 2384 | struct elf_dyn_relocs *p; |
| 2385 | |
| 2386 | for (p = ((struct elf_dyn_relocs *) |
| 2387 | elf_section_data (s)->local_dynrel); |
| 2388 | p != NULL; |
| 2389 | p = p->next) |
| 2390 | { |
| 2391 | if (!bfd_is_abs_section (p->sec) |
| 2392 | && bfd_is_abs_section (p->sec->output_section)) |
| 2393 | { |
| 2394 | /* Input section has been discarded, either because |
| 2395 | it is a copy of a linkonce section or due to |
| 2396 | linker script /DISCARD/, so we'll be discarding |
| 2397 | the relocs too. */ |
| 2398 | } |
| 2399 | else if (htab->is_vxworks |
| 2400 | && strcmp (p->sec->output_section->name, |
| 2401 | ".tls_vars") == 0) |
| 2402 | { |
| 2403 | /* Relocations in vxworks .tls_vars sections are |
| 2404 | handled specially by the loader. */ |
| 2405 | } |
| 2406 | else if (p->count != 0) |
| 2407 | { |
| 2408 | srel = elf_section_data (p->sec)->sreloc; |
| 2409 | srel->size += p->count * sizeof (Elf32_External_Rel); |
| 2410 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) |
| 2411 | info->flags |= DF_TEXTREL; |
| 2412 | } |
| 2413 | } |
| 2414 | } |
| 2415 | |
| 2416 | local_got = elf_local_got_refcounts (ibfd); |
| 2417 | if (!local_got) |
| 2418 | continue; |
| 2419 | |
| 2420 | symtab_hdr = &elf_symtab_hdr (ibfd); |
| 2421 | locsymcount = symtab_hdr->sh_info; |
| 2422 | end_local_got = local_got + locsymcount; |
| 2423 | local_tls_type = elf_i386_local_got_tls_type (ibfd); |
| 2424 | local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd); |
| 2425 | s = htab->elf.sgot; |
| 2426 | srel = htab->elf.srelgot; |
| 2427 | for (; local_got < end_local_got; |
| 2428 | ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) |
| 2429 | { |
| 2430 | *local_tlsdesc_gotent = (bfd_vma) -1; |
| 2431 | if (*local_got > 0) |
| 2432 | { |
| 2433 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 2434 | { |
| 2435 | *local_tlsdesc_gotent = htab->elf.sgotplt->size |
| 2436 | - elf_i386_compute_jump_table_size (htab); |
| 2437 | htab->elf.sgotplt->size += 8; |
| 2438 | *local_got = (bfd_vma) -2; |
| 2439 | } |
| 2440 | if (! GOT_TLS_GDESC_P (*local_tls_type) |
| 2441 | || GOT_TLS_GD_P (*local_tls_type)) |
| 2442 | { |
| 2443 | *local_got = s->size; |
| 2444 | s->size += 4; |
| 2445 | if (GOT_TLS_GD_P (*local_tls_type) |
| 2446 | || *local_tls_type == GOT_TLS_IE_BOTH) |
| 2447 | s->size += 4; |
| 2448 | } |
| 2449 | if (info->shared |
| 2450 | || GOT_TLS_GD_ANY_P (*local_tls_type) |
| 2451 | || (*local_tls_type & GOT_TLS_IE)) |
| 2452 | { |
| 2453 | if (*local_tls_type == GOT_TLS_IE_BOTH) |
| 2454 | srel->size += 2 * sizeof (Elf32_External_Rel); |
| 2455 | else if (GOT_TLS_GD_P (*local_tls_type) |
| 2456 | || ! GOT_TLS_GDESC_P (*local_tls_type)) |
| 2457 | srel->size += sizeof (Elf32_External_Rel); |
| 2458 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 2459 | htab->elf.srelplt->size += sizeof (Elf32_External_Rel); |
| 2460 | } |
| 2461 | } |
| 2462 | else |
| 2463 | *local_got = (bfd_vma) -1; |
| 2464 | } |
| 2465 | } |
| 2466 | |
| 2467 | if (htab->tls_ldm_got.refcount > 0) |
| 2468 | { |
| 2469 | /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM |
| 2470 | relocs. */ |
| 2471 | htab->tls_ldm_got.offset = htab->elf.sgot->size; |
| 2472 | htab->elf.sgot->size += 8; |
| 2473 | htab->elf.srelgot->size += sizeof (Elf32_External_Rel); |
| 2474 | } |
| 2475 | else |
| 2476 | htab->tls_ldm_got.offset = -1; |
| 2477 | |
| 2478 | /* Allocate global sym .plt and .got entries, and space for global |
| 2479 | sym dynamic relocs. */ |
| 2480 | elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info); |
| 2481 | |
| 2482 | /* Allocate .plt and .got entries, and space for local symbols. */ |
| 2483 | htab_traverse (htab->loc_hash_table, |
| 2484 | elf_i386_allocate_local_dynrelocs, |
| 2485 | info); |
| 2486 | |
| 2487 | /* For every jump slot reserved in the sgotplt, reloc_count is |
| 2488 | incremented. However, when we reserve space for TLS descriptors, |
| 2489 | it's not incremented, so in order to compute the space reserved |
| 2490 | for them, it suffices to multiply the reloc count by the jump |
| 2491 | slot size. */ |
| 2492 | if (htab->elf.srelplt) |
| 2493 | htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4; |
| 2494 | |
| 2495 | /* We now have determined the sizes of the various dynamic sections. |
| 2496 | Allocate memory for them. */ |
| 2497 | relocs = FALSE; |
| 2498 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 2499 | { |
| 2500 | bfd_boolean strip_section = TRUE; |
| 2501 | |
| 2502 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 2503 | continue; |
| 2504 | |
| 2505 | if (s == htab->elf.splt |
| 2506 | || s == htab->elf.sgot |
| 2507 | || s == htab->elf.sgotplt |
| 2508 | || s == htab->elf.iplt |
| 2509 | || s == htab->elf.igotplt |
| 2510 | || s == htab->sdynbss) |
| 2511 | { |
| 2512 | /* Strip this section if we don't need it; see the |
| 2513 | comment below. */ |
| 2514 | /* We'd like to strip these sections if they aren't needed, but if |
| 2515 | we've exported dynamic symbols from them we must leave them. |
| 2516 | It's too late to tell BFD to get rid of the symbols. */ |
| 2517 | |
| 2518 | if (htab->elf.hplt != NULL) |
| 2519 | strip_section = FALSE; |
| 2520 | } |
| 2521 | else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel")) |
| 2522 | { |
| 2523 | if (s->size != 0 |
| 2524 | && s != htab->elf.srelplt |
| 2525 | && s != htab->srelplt2) |
| 2526 | relocs = TRUE; |
| 2527 | |
| 2528 | /* We use the reloc_count field as a counter if we need |
| 2529 | to copy relocs into the output file. */ |
| 2530 | s->reloc_count = 0; |
| 2531 | } |
| 2532 | else |
| 2533 | { |
| 2534 | /* It's not one of our sections, so don't allocate space. */ |
| 2535 | continue; |
| 2536 | } |
| 2537 | |
| 2538 | if (s->size == 0) |
| 2539 | { |
| 2540 | /* If we don't need this section, strip it from the |
| 2541 | output file. This is mostly to handle .rel.bss and |
| 2542 | .rel.plt. We must create both sections in |
| 2543 | create_dynamic_sections, because they must be created |
| 2544 | before the linker maps input sections to output |
| 2545 | sections. The linker does that before |
| 2546 | adjust_dynamic_symbol is called, and it is that |
| 2547 | function which decides whether anything needs to go |
| 2548 | into these sections. */ |
| 2549 | if (strip_section) |
| 2550 | s->flags |= SEC_EXCLUDE; |
| 2551 | continue; |
| 2552 | } |
| 2553 | |
| 2554 | if ((s->flags & SEC_HAS_CONTENTS) == 0) |
| 2555 | continue; |
| 2556 | |
| 2557 | /* Allocate memory for the section contents. We use bfd_zalloc |
| 2558 | here in case unused entries are not reclaimed before the |
| 2559 | section's contents are written out. This should not happen, |
| 2560 | but this way if it does, we get a R_386_NONE reloc instead |
| 2561 | of garbage. */ |
| 2562 | s->contents = bfd_zalloc (dynobj, s->size); |
| 2563 | if (s->contents == NULL) |
| 2564 | return FALSE; |
| 2565 | } |
| 2566 | |
| 2567 | if (htab->elf.dynamic_sections_created) |
| 2568 | { |
| 2569 | /* Add some entries to the .dynamic section. We fill in the |
| 2570 | values later, in elf_i386_finish_dynamic_sections, but we |
| 2571 | must add the entries now so that we get the correct size for |
| 2572 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 2573 | dynamic linker and used by the debugger. */ |
| 2574 | #define add_dynamic_entry(TAG, VAL) \ |
| 2575 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| 2576 | |
| 2577 | if (info->executable) |
| 2578 | { |
| 2579 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 2580 | return FALSE; |
| 2581 | } |
| 2582 | |
| 2583 | if (htab->elf.splt->size != 0) |
| 2584 | { |
| 2585 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 2586 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 2587 | || !add_dynamic_entry (DT_PLTREL, DT_REL) |
| 2588 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 2589 | return FALSE; |
| 2590 | } |
| 2591 | |
| 2592 | if (relocs) |
| 2593 | { |
| 2594 | if (!add_dynamic_entry (DT_REL, 0) |
| 2595 | || !add_dynamic_entry (DT_RELSZ, 0) |
| 2596 | || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) |
| 2597 | return FALSE; |
| 2598 | |
| 2599 | /* If any dynamic relocs apply to a read-only section, |
| 2600 | then we need a DT_TEXTREL entry. */ |
| 2601 | if ((info->flags & DF_TEXTREL) == 0) |
| 2602 | elf_link_hash_traverse (&htab->elf, |
| 2603 | elf_i386_readonly_dynrelocs, info); |
| 2604 | |
| 2605 | if ((info->flags & DF_TEXTREL) != 0) |
| 2606 | { |
| 2607 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 2608 | return FALSE; |
| 2609 | } |
| 2610 | } |
| 2611 | if (htab->is_vxworks |
| 2612 | && !elf_vxworks_add_dynamic_entries (output_bfd, info)) |
| 2613 | return FALSE; |
| 2614 | } |
| 2615 | #undef add_dynamic_entry |
| 2616 | |
| 2617 | return TRUE; |
| 2618 | } |
| 2619 | |
| 2620 | static bfd_boolean |
| 2621 | elf_i386_always_size_sections (bfd *output_bfd, |
| 2622 | struct bfd_link_info *info) |
| 2623 | { |
| 2624 | asection *tls_sec = elf_hash_table (info)->tls_sec; |
| 2625 | |
| 2626 | if (tls_sec) |
| 2627 | { |
| 2628 | struct elf_link_hash_entry *tlsbase; |
| 2629 | |
| 2630 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), |
| 2631 | "_TLS_MODULE_BASE_", |
| 2632 | FALSE, FALSE, FALSE); |
| 2633 | |
| 2634 | if (tlsbase && tlsbase->type == STT_TLS) |
| 2635 | { |
| 2636 | struct bfd_link_hash_entry *bh = NULL; |
| 2637 | const struct elf_backend_data *bed |
| 2638 | = get_elf_backend_data (output_bfd); |
| 2639 | |
| 2640 | if (!(_bfd_generic_link_add_one_symbol |
| 2641 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, |
| 2642 | tls_sec, 0, NULL, FALSE, |
| 2643 | bed->collect, &bh))) |
| 2644 | return FALSE; |
| 2645 | |
| 2646 | elf_i386_hash_table (info)->tls_module_base = bh; |
| 2647 | |
| 2648 | tlsbase = (struct elf_link_hash_entry *)bh; |
| 2649 | tlsbase->def_regular = 1; |
| 2650 | tlsbase->other = STV_HIDDEN; |
| 2651 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); |
| 2652 | } |
| 2653 | } |
| 2654 | |
| 2655 | return TRUE; |
| 2656 | } |
| 2657 | |
| 2658 | /* Set the correct type for an x86 ELF section. We do this by the |
| 2659 | section name, which is a hack, but ought to work. */ |
| 2660 | |
| 2661 | static bfd_boolean |
| 2662 | elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, |
| 2663 | Elf_Internal_Shdr *hdr, |
| 2664 | asection *sec) |
| 2665 | { |
| 2666 | register const char *name; |
| 2667 | |
| 2668 | name = bfd_get_section_name (abfd, sec); |
| 2669 | |
| 2670 | /* This is an ugly, but unfortunately necessary hack that is |
| 2671 | needed when producing EFI binaries on x86. It tells |
| 2672 | elf.c:elf_fake_sections() not to consider ".reloc" as a section |
| 2673 | containing ELF relocation info. We need this hack in order to |
| 2674 | be able to generate ELF binaries that can be translated into |
| 2675 | EFI applications (which are essentially COFF objects). Those |
| 2676 | files contain a COFF ".reloc" section inside an ELFNN object, |
| 2677 | which would normally cause BFD to segfault because it would |
| 2678 | attempt to interpret this section as containing relocation |
| 2679 | entries for section "oc". With this hack enabled, ".reloc" |
| 2680 | will be treated as a normal data section, which will avoid the |
| 2681 | segfault. However, you won't be able to create an ELFNN binary |
| 2682 | with a section named "oc" that needs relocations, but that's |
| 2683 | the kind of ugly side-effects you get when detecting section |
| 2684 | types based on their names... In practice, this limitation is |
| 2685 | unlikely to bite. */ |
| 2686 | if (strcmp (name, ".reloc") == 0) |
| 2687 | hdr->sh_type = SHT_PROGBITS; |
| 2688 | |
| 2689 | return TRUE; |
| 2690 | } |
| 2691 | |
| 2692 | /* _TLS_MODULE_BASE_ needs to be treated especially when linking |
| 2693 | executables. Rather than setting it to the beginning of the TLS |
| 2694 | section, we have to set it to the end. This function may be called |
| 2695 | multiple times, it is idempotent. */ |
| 2696 | |
| 2697 | static void |
| 2698 | elf_i386_set_tls_module_base (struct bfd_link_info *info) |
| 2699 | { |
| 2700 | struct bfd_link_hash_entry *base; |
| 2701 | |
| 2702 | if (!info->executable) |
| 2703 | return; |
| 2704 | |
| 2705 | base = elf_i386_hash_table (info)->tls_module_base; |
| 2706 | |
| 2707 | if (!base) |
| 2708 | return; |
| 2709 | |
| 2710 | base->u.def.value = elf_hash_table (info)->tls_size; |
| 2711 | } |
| 2712 | |
| 2713 | /* Return the base VMA address which should be subtracted from real addresses |
| 2714 | when resolving @dtpoff relocation. |
| 2715 | This is PT_TLS segment p_vaddr. */ |
| 2716 | |
| 2717 | static bfd_vma |
| 2718 | elf_i386_dtpoff_base (struct bfd_link_info *info) |
| 2719 | { |
| 2720 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 2721 | if (elf_hash_table (info)->tls_sec == NULL) |
| 2722 | return 0; |
| 2723 | return elf_hash_table (info)->tls_sec->vma; |
| 2724 | } |
| 2725 | |
| 2726 | /* Return the relocation value for @tpoff relocation |
| 2727 | if STT_TLS virtual address is ADDRESS. */ |
| 2728 | |
| 2729 | static bfd_vma |
| 2730 | elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address) |
| 2731 | { |
| 2732 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 2733 | |
| 2734 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 2735 | if (htab->tls_sec == NULL) |
| 2736 | return 0; |
| 2737 | return htab->tls_size + htab->tls_sec->vma - address; |
| 2738 | } |
| 2739 | |
| 2740 | /* Relocate an i386 ELF section. */ |
| 2741 | |
| 2742 | static bfd_boolean |
| 2743 | elf_i386_relocate_section (bfd *output_bfd, |
| 2744 | struct bfd_link_info *info, |
| 2745 | bfd *input_bfd, |
| 2746 | asection *input_section, |
| 2747 | bfd_byte *contents, |
| 2748 | Elf_Internal_Rela *relocs, |
| 2749 | Elf_Internal_Sym *local_syms, |
| 2750 | asection **local_sections) |
| 2751 | { |
| 2752 | struct elf_i386_link_hash_table *htab; |
| 2753 | Elf_Internal_Shdr *symtab_hdr; |
| 2754 | struct elf_link_hash_entry **sym_hashes; |
| 2755 | bfd_vma *local_got_offsets; |
| 2756 | bfd_vma *local_tlsdesc_gotents; |
| 2757 | Elf_Internal_Rela *rel; |
| 2758 | Elf_Internal_Rela *relend; |
| 2759 | bfd_boolean is_vxworks_tls; |
| 2760 | |
| 2761 | BFD_ASSERT (is_i386_elf (input_bfd)); |
| 2762 | |
| 2763 | htab = elf_i386_hash_table (info); |
| 2764 | symtab_hdr = &elf_symtab_hdr (input_bfd); |
| 2765 | sym_hashes = elf_sym_hashes (input_bfd); |
| 2766 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 2767 | local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd); |
| 2768 | /* We have to handle relocations in vxworks .tls_vars sections |
| 2769 | specially, because the dynamic loader is 'weird'. */ |
| 2770 | is_vxworks_tls = (htab->is_vxworks && info->shared |
| 2771 | && !strcmp (input_section->output_section->name, |
| 2772 | ".tls_vars")); |
| 2773 | |
| 2774 | elf_i386_set_tls_module_base (info); |
| 2775 | |
| 2776 | rel = relocs; |
| 2777 | relend = relocs + input_section->reloc_count; |
| 2778 | for (; rel < relend; rel++) |
| 2779 | { |
| 2780 | unsigned int r_type; |
| 2781 | reloc_howto_type *howto; |
| 2782 | unsigned long r_symndx; |
| 2783 | struct elf_link_hash_entry *h; |
| 2784 | Elf_Internal_Sym *sym; |
| 2785 | asection *sec; |
| 2786 | bfd_vma off, offplt; |
| 2787 | bfd_vma relocation; |
| 2788 | bfd_boolean unresolved_reloc; |
| 2789 | bfd_reloc_status_type r; |
| 2790 | unsigned int indx; |
| 2791 | int tls_type; |
| 2792 | |
| 2793 | r_type = ELF32_R_TYPE (rel->r_info); |
| 2794 | if (r_type == R_386_GNU_VTINHERIT |
| 2795 | || r_type == R_386_GNU_VTENTRY) |
| 2796 | continue; |
| 2797 | |
| 2798 | if ((indx = r_type) >= R_386_standard |
| 2799 | && ((indx = r_type - R_386_ext_offset) - R_386_standard |
| 2800 | >= R_386_ext - R_386_standard) |
| 2801 | && ((indx = r_type - R_386_tls_offset) - R_386_ext |
| 2802 | >= R_386_irelative - R_386_ext)) |
| 2803 | { |
| 2804 | (*_bfd_error_handler) |
| 2805 | (_("%B: unrecognized relocation (0x%x) in section `%A'"), |
| 2806 | input_bfd, input_section, r_type); |
| 2807 | bfd_set_error (bfd_error_bad_value); |
| 2808 | return FALSE; |
| 2809 | } |
| 2810 | howto = elf_howto_table + indx; |
| 2811 | |
| 2812 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2813 | h = NULL; |
| 2814 | sym = NULL; |
| 2815 | sec = NULL; |
| 2816 | unresolved_reloc = FALSE; |
| 2817 | if (r_symndx < symtab_hdr->sh_info) |
| 2818 | { |
| 2819 | sym = local_syms + r_symndx; |
| 2820 | sec = local_sections[r_symndx]; |
| 2821 | relocation = (sec->output_section->vma |
| 2822 | + sec->output_offset |
| 2823 | + sym->st_value); |
| 2824 | |
| 2825 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION |
| 2826 | && ((sec->flags & SEC_MERGE) != 0 |
| 2827 | || (info->relocatable |
| 2828 | && sec->output_offset != 0))) |
| 2829 | { |
| 2830 | bfd_vma addend; |
| 2831 | bfd_byte *where = contents + rel->r_offset; |
| 2832 | |
| 2833 | switch (howto->size) |
| 2834 | { |
| 2835 | case 0: |
| 2836 | addend = bfd_get_8 (input_bfd, where); |
| 2837 | if (howto->pc_relative) |
| 2838 | { |
| 2839 | addend = (addend ^ 0x80) - 0x80; |
| 2840 | addend += 1; |
| 2841 | } |
| 2842 | break; |
| 2843 | case 1: |
| 2844 | addend = bfd_get_16 (input_bfd, where); |
| 2845 | if (howto->pc_relative) |
| 2846 | { |
| 2847 | addend = (addend ^ 0x8000) - 0x8000; |
| 2848 | addend += 2; |
| 2849 | } |
| 2850 | break; |
| 2851 | case 2: |
| 2852 | addend = bfd_get_32 (input_bfd, where); |
| 2853 | if (howto->pc_relative) |
| 2854 | { |
| 2855 | addend = (addend ^ 0x80000000) - 0x80000000; |
| 2856 | addend += 4; |
| 2857 | } |
| 2858 | break; |
| 2859 | default: |
| 2860 | abort (); |
| 2861 | } |
| 2862 | |
| 2863 | if (info->relocatable) |
| 2864 | addend += sec->output_offset; |
| 2865 | else |
| 2866 | { |
| 2867 | asection *msec = sec; |
| 2868 | addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, |
| 2869 | addend); |
| 2870 | addend -= relocation; |
| 2871 | addend += msec->output_section->vma + msec->output_offset; |
| 2872 | } |
| 2873 | |
| 2874 | switch (howto->size) |
| 2875 | { |
| 2876 | case 0: |
| 2877 | /* FIXME: overflow checks. */ |
| 2878 | if (howto->pc_relative) |
| 2879 | addend -= 1; |
| 2880 | bfd_put_8 (input_bfd, addend, where); |
| 2881 | break; |
| 2882 | case 1: |
| 2883 | if (howto->pc_relative) |
| 2884 | addend -= 2; |
| 2885 | bfd_put_16 (input_bfd, addend, where); |
| 2886 | break; |
| 2887 | case 2: |
| 2888 | if (howto->pc_relative) |
| 2889 | addend -= 4; |
| 2890 | bfd_put_32 (input_bfd, addend, where); |
| 2891 | break; |
| 2892 | } |
| 2893 | } |
| 2894 | else if (!info->relocatable |
| 2895 | && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) |
| 2896 | { |
| 2897 | /* Relocate against local STT_GNU_IFUNC symbol. */ |
| 2898 | h = elf_i386_get_local_sym_hash (htab, input_bfd, |
| 2899 | rel, FALSE); |
| 2900 | if (h == NULL) |
| 2901 | abort (); |
| 2902 | |
| 2903 | /* Set STT_GNU_IFUNC symbol value. */ |
| 2904 | h->root.u.def.value = sym->st_value; |
| 2905 | h->root.u.def.section = sec; |
| 2906 | } |
| 2907 | } |
| 2908 | else |
| 2909 | { |
| 2910 | bfd_boolean warned; |
| 2911 | |
| 2912 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 2913 | r_symndx, symtab_hdr, sym_hashes, |
| 2914 | h, sec, relocation, |
| 2915 | unresolved_reloc, warned); |
| 2916 | } |
| 2917 | |
| 2918 | if (sec != NULL && elf_discarded_section (sec)) |
| 2919 | { |
| 2920 | /* For relocs against symbols from removed linkonce sections, |
| 2921 | or sections discarded by a linker script, we just want the |
| 2922 | section contents zeroed. Avoid any special processing. */ |
| 2923 | _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); |
| 2924 | rel->r_info = 0; |
| 2925 | rel->r_addend = 0; |
| 2926 | continue; |
| 2927 | } |
| 2928 | |
| 2929 | if (info->relocatable) |
| 2930 | continue; |
| 2931 | |
| 2932 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle |
| 2933 | it here if it is defined in a non-shared object. */ |
| 2934 | if (h != NULL |
| 2935 | && h->type == STT_GNU_IFUNC |
| 2936 | && h->def_regular) |
| 2937 | { |
| 2938 | asection *plt, *gotplt, *base_got; |
| 2939 | bfd_vma plt_index; |
| 2940 | const char *name; |
| 2941 | |
| 2942 | if ((input_section->flags & SEC_ALLOC) == 0 |
| 2943 | || h->plt.offset == (bfd_vma) -1) |
| 2944 | abort (); |
| 2945 | |
| 2946 | /* STT_GNU_IFUNC symbol must go through PLT. */ |
| 2947 | if (htab->elf.splt != NULL) |
| 2948 | { |
| 2949 | plt = htab->elf.splt; |
| 2950 | gotplt = htab->elf.sgotplt; |
| 2951 | } |
| 2952 | else |
| 2953 | { |
| 2954 | plt = htab->elf.iplt; |
| 2955 | gotplt = htab->elf.igotplt; |
| 2956 | } |
| 2957 | |
| 2958 | relocation = (plt->output_section->vma |
| 2959 | + plt->output_offset + h->plt.offset); |
| 2960 | |
| 2961 | switch (r_type) |
| 2962 | { |
| 2963 | default: |
| 2964 | if (h->root.root.string) |
| 2965 | name = h->root.root.string; |
| 2966 | else |
| 2967 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, |
| 2968 | NULL); |
| 2969 | (*_bfd_error_handler) |
| 2970 | (_("%B: relocation %s against STT_GNU_IFUNC " |
| 2971 | "symbol `%s' isn't handled by %s"), input_bfd, |
| 2972 | elf_howto_table[r_type].name, |
| 2973 | name, __FUNCTION__); |
| 2974 | bfd_set_error (bfd_error_bad_value); |
| 2975 | return FALSE; |
| 2976 | |
| 2977 | case R_386_32: |
| 2978 | /* Generate dynamic relcoation only when there is a |
| 2979 | non-GOF reference in a shared object. */ |
| 2980 | if (info->shared && h->non_got_ref) |
| 2981 | { |
| 2982 | Elf_Internal_Rela outrel; |
| 2983 | bfd_byte *loc; |
| 2984 | asection *sreloc; |
| 2985 | bfd_vma offset; |
| 2986 | |
| 2987 | /* Need a dynamic relocation to get the real function |
| 2988 | adddress. */ |
| 2989 | offset = _bfd_elf_section_offset (output_bfd, |
| 2990 | info, |
| 2991 | input_section, |
| 2992 | rel->r_offset); |
| 2993 | if (offset == (bfd_vma) -1 |
| 2994 | || offset == (bfd_vma) -2) |
| 2995 | abort (); |
| 2996 | |
| 2997 | outrel.r_offset = (input_section->output_section->vma |
| 2998 | + input_section->output_offset |
| 2999 | + offset); |
| 3000 | |
| 3001 | if (h->dynindx == -1 |
| 3002 | || h->forced_local |
| 3003 | || info->executable) |
| 3004 | { |
| 3005 | /* This symbol is resolved locally. */ |
| 3006 | outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); |
| 3007 | bfd_put_32 (output_bfd, |
| 3008 | (h->root.u.def.value |
| 3009 | + h->root.u.def.section->output_section->vma |
| 3010 | + h->root.u.def.section->output_offset), |
| 3011 | contents + offset); |
| 3012 | } |
| 3013 | else |
| 3014 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 3015 | |
| 3016 | sreloc = htab->elf.irelifunc; |
| 3017 | loc = sreloc->contents; |
| 3018 | loc += (sreloc->reloc_count++ |
| 3019 | * sizeof (Elf32_External_Rel)); |
| 3020 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3021 | |
| 3022 | /* If this reloc is against an external symbol, we |
| 3023 | do not want to fiddle with the addend. Otherwise, |
| 3024 | we need to include the symbol value so that it |
| 3025 | becomes an addend for the dynamic reloc. For an |
| 3026 | internal symbol, we have updated addend. */ |
| 3027 | continue; |
| 3028 | } |
| 3029 | |
| 3030 | case R_386_PC32: |
| 3031 | case R_386_PLT32: |
| 3032 | goto do_relocation; |
| 3033 | |
| 3034 | case R_386_GOT32: |
| 3035 | base_got = htab->elf.sgot; |
| 3036 | off = h->got.offset; |
| 3037 | |
| 3038 | if (base_got == NULL) |
| 3039 | abort (); |
| 3040 | |
| 3041 | if (off == (bfd_vma) -1) |
| 3042 | { |
| 3043 | /* We can't use h->got.offset here to save state, or |
| 3044 | even just remember the offset, as finish_dynamic_symbol |
| 3045 | would use that as offset into .got. */ |
| 3046 | |
| 3047 | if (htab->elf.splt != NULL) |
| 3048 | { |
| 3049 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 3050 | off = (plt_index + 3) * 4; |
| 3051 | base_got = htab->elf.sgotplt; |
| 3052 | } |
| 3053 | else |
| 3054 | { |
| 3055 | plt_index = h->plt.offset / PLT_ENTRY_SIZE; |
| 3056 | off = plt_index * 4; |
| 3057 | base_got = htab->elf.igotplt; |
| 3058 | } |
| 3059 | |
| 3060 | if (h->dynindx == -1 |
| 3061 | || h->forced_local |
| 3062 | || info->symbolic) |
| 3063 | { |
| 3064 | /* This references the local defitionion. We must |
| 3065 | initialize this entry in the global offset table. |
| 3066 | Since the offset must always be a multiple of 8, |
| 3067 | we use the least significant bit to record |
| 3068 | whether we have initialized it already. |
| 3069 | |
| 3070 | When doing a dynamic link, we create a .rela.got |
| 3071 | relocation entry to initialize the value. This |
| 3072 | is done in the finish_dynamic_symbol routine. */ |
| 3073 | if ((off & 1) != 0) |
| 3074 | off &= ~1; |
| 3075 | else |
| 3076 | { |
| 3077 | bfd_put_32 (output_bfd, relocation, |
| 3078 | base_got->contents + off); |
| 3079 | h->got.offset |= 1; |
| 3080 | } |
| 3081 | } |
| 3082 | |
| 3083 | relocation = off; |
| 3084 | |
| 3085 | /* Adjust for static executables. */ |
| 3086 | if (htab->elf.splt == NULL) |
| 3087 | relocation += gotplt->output_offset; |
| 3088 | } |
| 3089 | else |
| 3090 | { |
| 3091 | relocation = (base_got->output_section->vma |
| 3092 | + base_got->output_offset + off |
| 3093 | - gotplt->output_section->vma |
| 3094 | - gotplt->output_offset); |
| 3095 | /* Adjust for static executables. */ |
| 3096 | if (htab->elf.splt == NULL) |
| 3097 | relocation += gotplt->output_offset; |
| 3098 | } |
| 3099 | |
| 3100 | goto do_relocation; |
| 3101 | |
| 3102 | case R_386_GOTOFF: |
| 3103 | relocation -= (gotplt->output_section->vma |
| 3104 | + gotplt->output_offset); |
| 3105 | goto do_relocation; |
| 3106 | } |
| 3107 | } |
| 3108 | |
| 3109 | switch (r_type) |
| 3110 | { |
| 3111 | case R_386_GOT32: |
| 3112 | /* Relocation is to the entry for this symbol in the global |
| 3113 | offset table. */ |
| 3114 | if (htab->elf.sgot == NULL) |
| 3115 | abort (); |
| 3116 | |
| 3117 | if (h != NULL) |
| 3118 | { |
| 3119 | bfd_boolean dyn; |
| 3120 | |
| 3121 | off = h->got.offset; |
| 3122 | dyn = htab->elf.dynamic_sections_created; |
| 3123 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| 3124 | || (info->shared |
| 3125 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 3126 | || (ELF_ST_VISIBILITY (h->other) |
| 3127 | && h->root.type == bfd_link_hash_undefweak)) |
| 3128 | { |
| 3129 | /* This is actually a static link, or it is a |
| 3130 | -Bsymbolic link and the symbol is defined |
| 3131 | locally, or the symbol was forced to be local |
| 3132 | because of a version file. We must initialize |
| 3133 | this entry in the global offset table. Since the |
| 3134 | offset must always be a multiple of 4, we use the |
| 3135 | least significant bit to record whether we have |
| 3136 | initialized it already. |
| 3137 | |
| 3138 | When doing a dynamic link, we create a .rel.got |
| 3139 | relocation entry to initialize the value. This |
| 3140 | is done in the finish_dynamic_symbol routine. */ |
| 3141 | if ((off & 1) != 0) |
| 3142 | off &= ~1; |
| 3143 | else |
| 3144 | { |
| 3145 | bfd_put_32 (output_bfd, relocation, |
| 3146 | htab->elf.sgot->contents + off); |
| 3147 | h->got.offset |= 1; |
| 3148 | } |
| 3149 | } |
| 3150 | else |
| 3151 | unresolved_reloc = FALSE; |
| 3152 | } |
| 3153 | else |
| 3154 | { |
| 3155 | if (local_got_offsets == NULL) |
| 3156 | abort (); |
| 3157 | |
| 3158 | off = local_got_offsets[r_symndx]; |
| 3159 | |
| 3160 | /* The offset must always be a multiple of 4. We use |
| 3161 | the least significant bit to record whether we have |
| 3162 | already generated the necessary reloc. */ |
| 3163 | if ((off & 1) != 0) |
| 3164 | off &= ~1; |
| 3165 | else |
| 3166 | { |
| 3167 | bfd_put_32 (output_bfd, relocation, |
| 3168 | htab->elf.sgot->contents + off); |
| 3169 | |
| 3170 | if (info->shared) |
| 3171 | { |
| 3172 | asection *s; |
| 3173 | Elf_Internal_Rela outrel; |
| 3174 | bfd_byte *loc; |
| 3175 | |
| 3176 | s = htab->elf.srelgot; |
| 3177 | if (s == NULL) |
| 3178 | abort (); |
| 3179 | |
| 3180 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 3181 | + htab->elf.sgot->output_offset |
| 3182 | + off); |
| 3183 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 3184 | loc = s->contents; |
| 3185 | loc += s->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3186 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3187 | } |
| 3188 | |
| 3189 | local_got_offsets[r_symndx] |= 1; |
| 3190 | } |
| 3191 | } |
| 3192 | |
| 3193 | if (off >= (bfd_vma) -2) |
| 3194 | abort (); |
| 3195 | |
| 3196 | relocation = htab->elf.sgot->output_section->vma |
| 3197 | + htab->elf.sgot->output_offset + off |
| 3198 | - htab->elf.sgotplt->output_section->vma |
| 3199 | - htab->elf.sgotplt->output_offset; |
| 3200 | break; |
| 3201 | |
| 3202 | case R_386_GOTOFF: |
| 3203 | /* Relocation is relative to the start of the global offset |
| 3204 | table. */ |
| 3205 | |
| 3206 | /* Check to make sure it isn't a protected function symbol |
| 3207 | for shared library since it may not be local when used |
| 3208 | as function address. We also need to make sure that a |
| 3209 | symbol is defined locally. */ |
| 3210 | if (info->shared && h) |
| 3211 | { |
| 3212 | if (!h->def_regular) |
| 3213 | { |
| 3214 | const char *v; |
| 3215 | |
| 3216 | switch (ELF_ST_VISIBILITY (h->other)) |
| 3217 | { |
| 3218 | case STV_HIDDEN: |
| 3219 | v = _("hidden symbol"); |
| 3220 | break; |
| 3221 | case STV_INTERNAL: |
| 3222 | v = _("internal symbol"); |
| 3223 | break; |
| 3224 | case STV_PROTECTED: |
| 3225 | v = _("protected symbol"); |
| 3226 | break; |
| 3227 | default: |
| 3228 | v = _("symbol"); |
| 3229 | break; |
| 3230 | } |
| 3231 | |
| 3232 | (*_bfd_error_handler) |
| 3233 | (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"), |
| 3234 | input_bfd, v, h->root.root.string); |
| 3235 | bfd_set_error (bfd_error_bad_value); |
| 3236 | return FALSE; |
| 3237 | } |
| 3238 | else if (!info->executable |
| 3239 | && h->type == STT_FUNC |
| 3240 | && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 3241 | { |
| 3242 | (*_bfd_error_handler) |
| 3243 | (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"), |
| 3244 | input_bfd, h->root.root.string); |
| 3245 | bfd_set_error (bfd_error_bad_value); |
| 3246 | return FALSE; |
| 3247 | } |
| 3248 | } |
| 3249 | |
| 3250 | /* Note that sgot is not involved in this |
| 3251 | calculation. We always want the start of .got.plt. If we |
| 3252 | defined _GLOBAL_OFFSET_TABLE_ in a different way, as is |
| 3253 | permitted by the ABI, we might have to change this |
| 3254 | calculation. */ |
| 3255 | relocation -= htab->elf.sgotplt->output_section->vma |
| 3256 | + htab->elf.sgotplt->output_offset; |
| 3257 | break; |
| 3258 | |
| 3259 | case R_386_GOTPC: |
| 3260 | /* Use global offset table as symbol value. */ |
| 3261 | relocation = htab->elf.sgotplt->output_section->vma |
| 3262 | + htab->elf.sgotplt->output_offset; |
| 3263 | unresolved_reloc = FALSE; |
| 3264 | break; |
| 3265 | |
| 3266 | case R_386_PLT32: |
| 3267 | /* Relocation is to the entry for this symbol in the |
| 3268 | procedure linkage table. */ |
| 3269 | |
| 3270 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 3271 | without using the procedure linkage table. */ |
| 3272 | if (h == NULL) |
| 3273 | break; |
| 3274 | |
| 3275 | if (h->plt.offset == (bfd_vma) -1 |
| 3276 | || htab->elf.splt == NULL) |
| 3277 | { |
| 3278 | /* We didn't make a PLT entry for this symbol. This |
| 3279 | happens when statically linking PIC code, or when |
| 3280 | using -Bsymbolic. */ |
| 3281 | break; |
| 3282 | } |
| 3283 | |
| 3284 | relocation = (htab->elf.splt->output_section->vma |
| 3285 | + htab->elf.splt->output_offset |
| 3286 | + h->plt.offset); |
| 3287 | unresolved_reloc = FALSE; |
| 3288 | break; |
| 3289 | |
| 3290 | case R_386_32: |
| 3291 | case R_386_PC32: |
| 3292 | if ((input_section->flags & SEC_ALLOC) == 0 |
| 3293 | || is_vxworks_tls) |
| 3294 | break; |
| 3295 | |
| 3296 | if ((info->shared |
| 3297 | && (h == NULL |
| 3298 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 3299 | || h->root.type != bfd_link_hash_undefweak) |
| 3300 | && (r_type != R_386_PC32 |
| 3301 | || !SYMBOL_CALLS_LOCAL (info, h))) |
| 3302 | || (ELIMINATE_COPY_RELOCS |
| 3303 | && !info->shared |
| 3304 | && h != NULL |
| 3305 | && h->dynindx != -1 |
| 3306 | && !h->non_got_ref |
| 3307 | && ((h->def_dynamic |
| 3308 | && !h->def_regular) |
| 3309 | || h->root.type == bfd_link_hash_undefweak |
| 3310 | || h->root.type == bfd_link_hash_undefined))) |
| 3311 | { |
| 3312 | Elf_Internal_Rela outrel; |
| 3313 | bfd_byte *loc; |
| 3314 | bfd_boolean skip, relocate; |
| 3315 | asection *sreloc; |
| 3316 | |
| 3317 | /* When generating a shared object, these relocations |
| 3318 | are copied into the output file to be resolved at run |
| 3319 | time. */ |
| 3320 | |
| 3321 | skip = FALSE; |
| 3322 | relocate = FALSE; |
| 3323 | |
| 3324 | outrel.r_offset = |
| 3325 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 3326 | rel->r_offset); |
| 3327 | if (outrel.r_offset == (bfd_vma) -1) |
| 3328 | skip = TRUE; |
| 3329 | else if (outrel.r_offset == (bfd_vma) -2) |
| 3330 | skip = TRUE, relocate = TRUE; |
| 3331 | outrel.r_offset += (input_section->output_section->vma |
| 3332 | + input_section->output_offset); |
| 3333 | |
| 3334 | if (skip) |
| 3335 | memset (&outrel, 0, sizeof outrel); |
| 3336 | else if (h != NULL |
| 3337 | && h->dynindx != -1 |
| 3338 | && (r_type == R_386_PC32 |
| 3339 | || !info->shared |
| 3340 | || !SYMBOLIC_BIND (info, h) |
| 3341 | || !h->def_regular)) |
| 3342 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 3343 | else |
| 3344 | { |
| 3345 | /* This symbol is local, or marked to become local. */ |
| 3346 | relocate = TRUE; |
| 3347 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 3348 | } |
| 3349 | |
| 3350 | sreloc = elf_section_data (input_section)->sreloc; |
| 3351 | |
| 3352 | BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL); |
| 3353 | |
| 3354 | loc = sreloc->contents; |
| 3355 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3356 | |
| 3357 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3358 | |
| 3359 | /* If this reloc is against an external symbol, we do |
| 3360 | not want to fiddle with the addend. Otherwise, we |
| 3361 | need to include the symbol value so that it becomes |
| 3362 | an addend for the dynamic reloc. */ |
| 3363 | if (! relocate) |
| 3364 | continue; |
| 3365 | } |
| 3366 | break; |
| 3367 | |
| 3368 | case R_386_TLS_IE: |
| 3369 | if (!info->executable) |
| 3370 | { |
| 3371 | Elf_Internal_Rela outrel; |
| 3372 | bfd_byte *loc; |
| 3373 | asection *sreloc; |
| 3374 | |
| 3375 | outrel.r_offset = rel->r_offset |
| 3376 | + input_section->output_section->vma |
| 3377 | + input_section->output_offset; |
| 3378 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 3379 | sreloc = elf_section_data (input_section)->sreloc; |
| 3380 | if (sreloc == NULL) |
| 3381 | abort (); |
| 3382 | loc = sreloc->contents; |
| 3383 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3384 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3385 | } |
| 3386 | /* Fall through */ |
| 3387 | |
| 3388 | case R_386_TLS_GD: |
| 3389 | case R_386_TLS_GOTDESC: |
| 3390 | case R_386_TLS_DESC_CALL: |
| 3391 | case R_386_TLS_IE_32: |
| 3392 | case R_386_TLS_GOTIE: |
| 3393 | tls_type = GOT_UNKNOWN; |
| 3394 | if (h == NULL && local_got_offsets) |
| 3395 | tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx]; |
| 3396 | else if (h != NULL) |
| 3397 | tls_type = elf_i386_hash_entry(h)->tls_type; |
| 3398 | if (tls_type == GOT_TLS_IE) |
| 3399 | tls_type = GOT_TLS_IE_NEG; |
| 3400 | |
| 3401 | if (! elf_i386_tls_transition (info, input_bfd, |
| 3402 | input_section, contents, |
| 3403 | symtab_hdr, sym_hashes, |
| 3404 | &r_type, tls_type, rel, |
| 3405 | relend, h, r_symndx)) |
| 3406 | return FALSE; |
| 3407 | |
| 3408 | if (r_type == R_386_TLS_LE_32) |
| 3409 | { |
| 3410 | BFD_ASSERT (! unresolved_reloc); |
| 3411 | if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) |
| 3412 | { |
| 3413 | unsigned int type; |
| 3414 | bfd_vma roff; |
| 3415 | |
| 3416 | /* GD->LE transition. */ |
| 3417 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 3418 | if (type == 0x04) |
| 3419 | { |
| 3420 | /* leal foo(,%reg,1), %eax; call ___tls_get_addr |
| 3421 | Change it into: |
| 3422 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 3423 | (6 byte form of subl). */ |
| 3424 | memcpy (contents + rel->r_offset - 3, |
| 3425 | "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
| 3426 | roff = rel->r_offset + 5; |
| 3427 | } |
| 3428 | else |
| 3429 | { |
| 3430 | /* leal foo(%reg), %eax; call ___tls_get_addr; nop |
| 3431 | Change it into: |
| 3432 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 3433 | (6 byte form of subl). */ |
| 3434 | memcpy (contents + rel->r_offset - 2, |
| 3435 | "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
| 3436 | roff = rel->r_offset + 6; |
| 3437 | } |
| 3438 | bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), |
| 3439 | contents + roff); |
| 3440 | /* Skip R_386_PC32/R_386_PLT32. */ |
| 3441 | rel++; |
| 3442 | continue; |
| 3443 | } |
| 3444 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) |
| 3445 | { |
| 3446 | /* GDesc -> LE transition. |
| 3447 | It's originally something like: |
| 3448 | leal x@tlsdesc(%ebx), %eax |
| 3449 | |
| 3450 | leal x@ntpoff, %eax |
| 3451 | |
| 3452 | Registers other than %eax may be set up here. */ |
| 3453 | |
| 3454 | unsigned int val; |
| 3455 | bfd_vma roff; |
| 3456 | |
| 3457 | roff = rel->r_offset; |
| 3458 | val = bfd_get_8 (input_bfd, contents + roff - 1); |
| 3459 | |
| 3460 | /* Now modify the instruction as appropriate. */ |
| 3461 | /* aoliva FIXME: remove the above and xor the byte |
| 3462 | below with 0x86. */ |
| 3463 | bfd_put_8 (output_bfd, val ^ 0x86, |
| 3464 | contents + roff - 1); |
| 3465 | bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), |
| 3466 | contents + roff); |
| 3467 | continue; |
| 3468 | } |
| 3469 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) |
| 3470 | { |
| 3471 | /* GDesc -> LE transition. |
| 3472 | It's originally: |
| 3473 | call *(%eax) |
| 3474 | Turn it into: |
| 3475 | xchg %ax,%ax */ |
| 3476 | |
| 3477 | bfd_vma roff; |
| 3478 | |
| 3479 | roff = rel->r_offset; |
| 3480 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 3481 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 3482 | continue; |
| 3483 | } |
| 3484 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE) |
| 3485 | { |
| 3486 | unsigned int val; |
| 3487 | |
| 3488 | /* IE->LE transition: |
| 3489 | Originally it can be one of: |
| 3490 | movl foo, %eax |
| 3491 | movl foo, %reg |
| 3492 | addl foo, %reg |
| 3493 | We change it into: |
| 3494 | movl $foo, %eax |
| 3495 | movl $foo, %reg |
| 3496 | addl $foo, %reg. */ |
| 3497 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 3498 | if (val == 0xa1) |
| 3499 | { |
| 3500 | /* movl foo, %eax. */ |
| 3501 | bfd_put_8 (output_bfd, 0xb8, |
| 3502 | contents + rel->r_offset - 1); |
| 3503 | } |
| 3504 | else |
| 3505 | { |
| 3506 | unsigned int type; |
| 3507 | |
| 3508 | type = bfd_get_8 (input_bfd, |
| 3509 | contents + rel->r_offset - 2); |
| 3510 | switch (type) |
| 3511 | { |
| 3512 | case 0x8b: |
| 3513 | /* movl */ |
| 3514 | bfd_put_8 (output_bfd, 0xc7, |
| 3515 | contents + rel->r_offset - 2); |
| 3516 | bfd_put_8 (output_bfd, |
| 3517 | 0xc0 | ((val >> 3) & 7), |
| 3518 | contents + rel->r_offset - 1); |
| 3519 | break; |
| 3520 | case 0x03: |
| 3521 | /* addl */ |
| 3522 | bfd_put_8 (output_bfd, 0x81, |
| 3523 | contents + rel->r_offset - 2); |
| 3524 | bfd_put_8 (output_bfd, |
| 3525 | 0xc0 | ((val >> 3) & 7), |
| 3526 | contents + rel->r_offset - 1); |
| 3527 | break; |
| 3528 | default: |
| 3529 | BFD_FAIL (); |
| 3530 | break; |
| 3531 | } |
| 3532 | } |
| 3533 | bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), |
| 3534 | contents + rel->r_offset); |
| 3535 | continue; |
| 3536 | } |
| 3537 | else |
| 3538 | { |
| 3539 | unsigned int val, type; |
| 3540 | |
| 3541 | /* {IE_32,GOTIE}->LE transition: |
| 3542 | Originally it can be one of: |
| 3543 | subl foo(%reg1), %reg2 |
| 3544 | movl foo(%reg1), %reg2 |
| 3545 | addl foo(%reg1), %reg2 |
| 3546 | We change it into: |
| 3547 | subl $foo, %reg2 |
| 3548 | movl $foo, %reg2 (6 byte form) |
| 3549 | addl $foo, %reg2. */ |
| 3550 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 3551 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 3552 | if (type == 0x8b) |
| 3553 | { |
| 3554 | /* movl */ |
| 3555 | bfd_put_8 (output_bfd, 0xc7, |
| 3556 | contents + rel->r_offset - 2); |
| 3557 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 3558 | contents + rel->r_offset - 1); |
| 3559 | } |
| 3560 | else if (type == 0x2b) |
| 3561 | { |
| 3562 | /* subl */ |
| 3563 | bfd_put_8 (output_bfd, 0x81, |
| 3564 | contents + rel->r_offset - 2); |
| 3565 | bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), |
| 3566 | contents + rel->r_offset - 1); |
| 3567 | } |
| 3568 | else if (type == 0x03) |
| 3569 | { |
| 3570 | /* addl */ |
| 3571 | bfd_put_8 (output_bfd, 0x81, |
| 3572 | contents + rel->r_offset - 2); |
| 3573 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 3574 | contents + rel->r_offset - 1); |
| 3575 | } |
| 3576 | else |
| 3577 | BFD_FAIL (); |
| 3578 | if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE) |
| 3579 | bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), |
| 3580 | contents + rel->r_offset); |
| 3581 | else |
| 3582 | bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), |
| 3583 | contents + rel->r_offset); |
| 3584 | continue; |
| 3585 | } |
| 3586 | } |
| 3587 | |
| 3588 | if (htab->elf.sgot == NULL) |
| 3589 | abort (); |
| 3590 | |
| 3591 | if (h != NULL) |
| 3592 | { |
| 3593 | off = h->got.offset; |
| 3594 | offplt = elf_i386_hash_entry (h)->tlsdesc_got; |
| 3595 | } |
| 3596 | else |
| 3597 | { |
| 3598 | if (local_got_offsets == NULL) |
| 3599 | abort (); |
| 3600 | |
| 3601 | off = local_got_offsets[r_symndx]; |
| 3602 | offplt = local_tlsdesc_gotents[r_symndx]; |
| 3603 | } |
| 3604 | |
| 3605 | if ((off & 1) != 0) |
| 3606 | off &= ~1; |
| 3607 | else |
| 3608 | { |
| 3609 | Elf_Internal_Rela outrel; |
| 3610 | bfd_byte *loc; |
| 3611 | int dr_type, indx; |
| 3612 | asection *sreloc; |
| 3613 | |
| 3614 | if (htab->elf.srelgot == NULL) |
| 3615 | abort (); |
| 3616 | |
| 3617 | indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| 3618 | |
| 3619 | if (GOT_TLS_GDESC_P (tls_type)) |
| 3620 | { |
| 3621 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC); |
| 3622 | BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8 |
| 3623 | <= htab->elf.sgotplt->size); |
| 3624 | outrel.r_offset = (htab->elf.sgotplt->output_section->vma |
| 3625 | + htab->elf.sgotplt->output_offset |
| 3626 | + offplt |
| 3627 | + htab->sgotplt_jump_table_size); |
| 3628 | sreloc = htab->elf.srelplt; |
| 3629 | loc = sreloc->contents; |
| 3630 | loc += (htab->next_tls_desc_index++ |
| 3631 | * sizeof (Elf32_External_Rel)); |
| 3632 | BFD_ASSERT (loc + sizeof (Elf32_External_Rel) |
| 3633 | <= sreloc->contents + sreloc->size); |
| 3634 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3635 | if (indx == 0) |
| 3636 | { |
| 3637 | BFD_ASSERT (! unresolved_reloc); |
| 3638 | bfd_put_32 (output_bfd, |
| 3639 | relocation - elf_i386_dtpoff_base (info), |
| 3640 | htab->elf.sgotplt->contents + offplt |
| 3641 | + htab->sgotplt_jump_table_size + 4); |
| 3642 | } |
| 3643 | else |
| 3644 | { |
| 3645 | bfd_put_32 (output_bfd, 0, |
| 3646 | htab->elf.sgotplt->contents + offplt |
| 3647 | + htab->sgotplt_jump_table_size + 4); |
| 3648 | } |
| 3649 | } |
| 3650 | |
| 3651 | sreloc = htab->elf.srelgot; |
| 3652 | |
| 3653 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 3654 | + htab->elf.sgot->output_offset + off); |
| 3655 | |
| 3656 | if (GOT_TLS_GD_P (tls_type)) |
| 3657 | dr_type = R_386_TLS_DTPMOD32; |
| 3658 | else if (GOT_TLS_GDESC_P (tls_type)) |
| 3659 | goto dr_done; |
| 3660 | else if (tls_type == GOT_TLS_IE_POS) |
| 3661 | dr_type = R_386_TLS_TPOFF; |
| 3662 | else |
| 3663 | dr_type = R_386_TLS_TPOFF32; |
| 3664 | |
| 3665 | if (dr_type == R_386_TLS_TPOFF && indx == 0) |
| 3666 | bfd_put_32 (output_bfd, |
| 3667 | relocation - elf_i386_dtpoff_base (info), |
| 3668 | htab->elf.sgot->contents + off); |
| 3669 | else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) |
| 3670 | bfd_put_32 (output_bfd, |
| 3671 | elf_i386_dtpoff_base (info) - relocation, |
| 3672 | htab->elf.sgot->contents + off); |
| 3673 | else if (dr_type != R_386_TLS_DESC) |
| 3674 | bfd_put_32 (output_bfd, 0, |
| 3675 | htab->elf.sgot->contents + off); |
| 3676 | outrel.r_info = ELF32_R_INFO (indx, dr_type); |
| 3677 | |
| 3678 | loc = sreloc->contents; |
| 3679 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3680 | BFD_ASSERT (loc + sizeof (Elf32_External_Rel) |
| 3681 | <= sreloc->contents + sreloc->size); |
| 3682 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3683 | |
| 3684 | if (GOT_TLS_GD_P (tls_type)) |
| 3685 | { |
| 3686 | if (indx == 0) |
| 3687 | { |
| 3688 | BFD_ASSERT (! unresolved_reloc); |
| 3689 | bfd_put_32 (output_bfd, |
| 3690 | relocation - elf_i386_dtpoff_base (info), |
| 3691 | htab->elf.sgot->contents + off + 4); |
| 3692 | } |
| 3693 | else |
| 3694 | { |
| 3695 | bfd_put_32 (output_bfd, 0, |
| 3696 | htab->elf.sgot->contents + off + 4); |
| 3697 | outrel.r_info = ELF32_R_INFO (indx, |
| 3698 | R_386_TLS_DTPOFF32); |
| 3699 | outrel.r_offset += 4; |
| 3700 | sreloc->reloc_count++; |
| 3701 | loc += sizeof (Elf32_External_Rel); |
| 3702 | BFD_ASSERT (loc + sizeof (Elf32_External_Rel) |
| 3703 | <= sreloc->contents + sreloc->size); |
| 3704 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3705 | } |
| 3706 | } |
| 3707 | else if (tls_type == GOT_TLS_IE_BOTH) |
| 3708 | { |
| 3709 | bfd_put_32 (output_bfd, |
| 3710 | (indx == 0 |
| 3711 | ? relocation - elf_i386_dtpoff_base (info) |
| 3712 | : 0), |
| 3713 | htab->elf.sgot->contents + off + 4); |
| 3714 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); |
| 3715 | outrel.r_offset += 4; |
| 3716 | sreloc->reloc_count++; |
| 3717 | loc += sizeof (Elf32_External_Rel); |
| 3718 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3719 | } |
| 3720 | |
| 3721 | dr_done: |
| 3722 | if (h != NULL) |
| 3723 | h->got.offset |= 1; |
| 3724 | else |
| 3725 | local_got_offsets[r_symndx] |= 1; |
| 3726 | } |
| 3727 | |
| 3728 | if (off >= (bfd_vma) -2 |
| 3729 | && ! GOT_TLS_GDESC_P (tls_type)) |
| 3730 | abort (); |
| 3731 | if (r_type == R_386_TLS_GOTDESC |
| 3732 | || r_type == R_386_TLS_DESC_CALL) |
| 3733 | { |
| 3734 | relocation = htab->sgotplt_jump_table_size + offplt; |
| 3735 | unresolved_reloc = FALSE; |
| 3736 | } |
| 3737 | else if (r_type == ELF32_R_TYPE (rel->r_info)) |
| 3738 | { |
| 3739 | bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma |
| 3740 | + htab->elf.sgotplt->output_offset; |
| 3741 | relocation = htab->elf.sgot->output_section->vma |
| 3742 | + htab->elf.sgot->output_offset + off - g_o_t; |
| 3743 | if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) |
| 3744 | && tls_type == GOT_TLS_IE_BOTH) |
| 3745 | relocation += 4; |
| 3746 | if (r_type == R_386_TLS_IE) |
| 3747 | relocation += g_o_t; |
| 3748 | unresolved_reloc = FALSE; |
| 3749 | } |
| 3750 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) |
| 3751 | { |
| 3752 | unsigned int val, type; |
| 3753 | bfd_vma roff; |
| 3754 | |
| 3755 | /* GD->IE transition. */ |
| 3756 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 3757 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 3758 | if (type == 0x04) |
| 3759 | { |
| 3760 | /* leal foo(,%reg,1), %eax; call ___tls_get_addr |
| 3761 | Change it into: |
| 3762 | movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ |
| 3763 | val >>= 3; |
| 3764 | roff = rel->r_offset - 3; |
| 3765 | } |
| 3766 | else |
| 3767 | { |
| 3768 | /* leal foo(%reg), %eax; call ___tls_get_addr; nop |
| 3769 | Change it into: |
| 3770 | movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */ |
| 3771 | roff = rel->r_offset - 2; |
| 3772 | } |
| 3773 | memcpy (contents + roff, |
| 3774 | "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); |
| 3775 | contents[roff + 7] = 0x80 | (val & 7); |
| 3776 | /* If foo is used only with foo@gotntpoff(%reg) and |
| 3777 | foo@indntpoff, but not with foo@gottpoff(%reg), change |
| 3778 | subl $foo@gottpoff(%reg), %eax |
| 3779 | into: |
| 3780 | addl $foo@gotntpoff(%reg), %eax. */ |
| 3781 | if (tls_type == GOT_TLS_IE_POS) |
| 3782 | contents[roff + 6] = 0x03; |
| 3783 | bfd_put_32 (output_bfd, |
| 3784 | htab->elf.sgot->output_section->vma |
| 3785 | + htab->elf.sgot->output_offset + off |
| 3786 | - htab->elf.sgotplt->output_section->vma |
| 3787 | - htab->elf.sgotplt->output_offset, |
| 3788 | contents + roff + 8); |
| 3789 | /* Skip R_386_PLT32. */ |
| 3790 | rel++; |
| 3791 | continue; |
| 3792 | } |
| 3793 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC) |
| 3794 | { |
| 3795 | /* GDesc -> IE transition. |
| 3796 | It's originally something like: |
| 3797 | leal x@tlsdesc(%ebx), %eax |
| 3798 | |
| 3799 | Change it to: |
| 3800 | movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax |
| 3801 | or: |
| 3802 | movl x@gottpoff(%ebx), %eax # before negl %eax |
| 3803 | |
| 3804 | Registers other than %eax may be set up here. */ |
| 3805 | |
| 3806 | bfd_vma roff; |
| 3807 | |
| 3808 | /* First, make sure it's a leal adding ebx to a 32-bit |
| 3809 | offset into any register, although it's probably |
| 3810 | almost always going to be eax. */ |
| 3811 | roff = rel->r_offset; |
| 3812 | |
| 3813 | /* Now modify the instruction as appropriate. */ |
| 3814 | /* To turn a leal into a movl in the form we use it, it |
| 3815 | suffices to change the first byte from 0x8d to 0x8b. |
| 3816 | aoliva FIXME: should we decide to keep the leal, all |
| 3817 | we have to do is remove the statement below, and |
| 3818 | adjust the relaxation of R_386_TLS_DESC_CALL. */ |
| 3819 | bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); |
| 3820 | |
| 3821 | if (tls_type == GOT_TLS_IE_BOTH) |
| 3822 | off += 4; |
| 3823 | |
| 3824 | bfd_put_32 (output_bfd, |
| 3825 | htab->elf.sgot->output_section->vma |
| 3826 | + htab->elf.sgot->output_offset + off |
| 3827 | - htab->elf.sgotplt->output_section->vma |
| 3828 | - htab->elf.sgotplt->output_offset, |
| 3829 | contents + roff); |
| 3830 | continue; |
| 3831 | } |
| 3832 | else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL) |
| 3833 | { |
| 3834 | /* GDesc -> IE transition. |
| 3835 | It's originally: |
| 3836 | call *(%eax) |
| 3837 | |
| 3838 | Change it to: |
| 3839 | xchg %ax,%ax |
| 3840 | or |
| 3841 | negl %eax |
| 3842 | depending on how we transformed the TLS_GOTDESC above. |
| 3843 | */ |
| 3844 | |
| 3845 | bfd_vma roff; |
| 3846 | |
| 3847 | roff = rel->r_offset; |
| 3848 | |
| 3849 | /* Now modify the instruction as appropriate. */ |
| 3850 | if (tls_type != GOT_TLS_IE_NEG) |
| 3851 | { |
| 3852 | /* xchg %ax,%ax */ |
| 3853 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 3854 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 3855 | } |
| 3856 | else |
| 3857 | { |
| 3858 | /* negl %eax */ |
| 3859 | bfd_put_8 (output_bfd, 0xf7, contents + roff); |
| 3860 | bfd_put_8 (output_bfd, 0xd8, contents + roff + 1); |
| 3861 | } |
| 3862 | |
| 3863 | continue; |
| 3864 | } |
| 3865 | else |
| 3866 | BFD_ASSERT (FALSE); |
| 3867 | break; |
| 3868 | |
| 3869 | case R_386_TLS_LDM: |
| 3870 | if (! elf_i386_tls_transition (info, input_bfd, |
| 3871 | input_section, contents, |
| 3872 | symtab_hdr, sym_hashes, |
| 3873 | &r_type, GOT_UNKNOWN, rel, |
| 3874 | relend, h, r_symndx)) |
| 3875 | return FALSE; |
| 3876 | |
| 3877 | if (r_type != R_386_TLS_LDM) |
| 3878 | { |
| 3879 | /* LD->LE transition: |
| 3880 | leal foo(%reg), %eax; call ___tls_get_addr. |
| 3881 | We change it into: |
| 3882 | movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */ |
| 3883 | BFD_ASSERT (r_type == R_386_TLS_LE_32); |
| 3884 | memcpy (contents + rel->r_offset - 2, |
| 3885 | "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); |
| 3886 | /* Skip R_386_PC32/R_386_PLT32. */ |
| 3887 | rel++; |
| 3888 | continue; |
| 3889 | } |
| 3890 | |
| 3891 | if (htab->elf.sgot == NULL) |
| 3892 | abort (); |
| 3893 | |
| 3894 | off = htab->tls_ldm_got.offset; |
| 3895 | if (off & 1) |
| 3896 | off &= ~1; |
| 3897 | else |
| 3898 | { |
| 3899 | Elf_Internal_Rela outrel; |
| 3900 | bfd_byte *loc; |
| 3901 | |
| 3902 | if (htab->elf.srelgot == NULL) |
| 3903 | abort (); |
| 3904 | |
| 3905 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 3906 | + htab->elf.sgot->output_offset + off); |
| 3907 | |
| 3908 | bfd_put_32 (output_bfd, 0, |
| 3909 | htab->elf.sgot->contents + off); |
| 3910 | bfd_put_32 (output_bfd, 0, |
| 3911 | htab->elf.sgot->contents + off + 4); |
| 3912 | outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); |
| 3913 | loc = htab->elf.srelgot->contents; |
| 3914 | loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3915 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3916 | htab->tls_ldm_got.offset |= 1; |
| 3917 | } |
| 3918 | relocation = htab->elf.sgot->output_section->vma |
| 3919 | + htab->elf.sgot->output_offset + off |
| 3920 | - htab->elf.sgotplt->output_section->vma |
| 3921 | - htab->elf.sgotplt->output_offset; |
| 3922 | unresolved_reloc = FALSE; |
| 3923 | break; |
| 3924 | |
| 3925 | case R_386_TLS_LDO_32: |
| 3926 | if (info->shared || (input_section->flags & SEC_CODE) == 0) |
| 3927 | relocation -= elf_i386_dtpoff_base (info); |
| 3928 | else |
| 3929 | /* When converting LDO to LE, we must negate. */ |
| 3930 | relocation = -elf_i386_tpoff (info, relocation); |
| 3931 | break; |
| 3932 | |
| 3933 | case R_386_TLS_LE_32: |
| 3934 | case R_386_TLS_LE: |
| 3935 | if (!info->executable) |
| 3936 | { |
| 3937 | Elf_Internal_Rela outrel; |
| 3938 | asection *sreloc; |
| 3939 | bfd_byte *loc; |
| 3940 | int indx; |
| 3941 | |
| 3942 | outrel.r_offset = rel->r_offset |
| 3943 | + input_section->output_section->vma |
| 3944 | + input_section->output_offset; |
| 3945 | if (h != NULL && h->dynindx != -1) |
| 3946 | indx = h->dynindx; |
| 3947 | else |
| 3948 | indx = 0; |
| 3949 | if (r_type == R_386_TLS_LE_32) |
| 3950 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); |
| 3951 | else |
| 3952 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); |
| 3953 | sreloc = elf_section_data (input_section)->sreloc; |
| 3954 | if (sreloc == NULL) |
| 3955 | abort (); |
| 3956 | loc = sreloc->contents; |
| 3957 | loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); |
| 3958 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3959 | if (indx) |
| 3960 | continue; |
| 3961 | else if (r_type == R_386_TLS_LE_32) |
| 3962 | relocation = elf_i386_dtpoff_base (info) - relocation; |
| 3963 | else |
| 3964 | relocation -= elf_i386_dtpoff_base (info); |
| 3965 | } |
| 3966 | else if (r_type == R_386_TLS_LE_32) |
| 3967 | relocation = elf_i386_tpoff (info, relocation); |
| 3968 | else |
| 3969 | relocation = -elf_i386_tpoff (info, relocation); |
| 3970 | break; |
| 3971 | |
| 3972 | default: |
| 3973 | break; |
| 3974 | } |
| 3975 | |
| 3976 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 3977 | because such sections are not SEC_ALLOC and thus ld.so will |
| 3978 | not process them. */ |
| 3979 | if (unresolved_reloc |
| 3980 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 3981 | && h->def_dynamic)) |
| 3982 | { |
| 3983 | (*_bfd_error_handler) |
| 3984 | (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), |
| 3985 | input_bfd, |
| 3986 | input_section, |
| 3987 | (long) rel->r_offset, |
| 3988 | howto->name, |
| 3989 | h->root.root.string); |
| 3990 | return FALSE; |
| 3991 | } |
| 3992 | |
| 3993 | do_relocation: |
| 3994 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 3995 | contents, rel->r_offset, |
| 3996 | relocation, 0); |
| 3997 | |
| 3998 | if (r != bfd_reloc_ok) |
| 3999 | { |
| 4000 | const char *name; |
| 4001 | |
| 4002 | if (h != NULL) |
| 4003 | name = h->root.root.string; |
| 4004 | else |
| 4005 | { |
| 4006 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 4007 | symtab_hdr->sh_link, |
| 4008 | sym->st_name); |
| 4009 | if (name == NULL) |
| 4010 | return FALSE; |
| 4011 | if (*name == '\0') |
| 4012 | name = bfd_section_name (input_bfd, sec); |
| 4013 | } |
| 4014 | |
| 4015 | if (r == bfd_reloc_overflow) |
| 4016 | { |
| 4017 | if (! ((*info->callbacks->reloc_overflow) |
| 4018 | (info, (h ? &h->root : NULL), name, howto->name, |
| 4019 | (bfd_vma) 0, input_bfd, input_section, |
| 4020 | rel->r_offset))) |
| 4021 | return FALSE; |
| 4022 | } |
| 4023 | else |
| 4024 | { |
| 4025 | (*_bfd_error_handler) |
| 4026 | (_("%B(%A+0x%lx): reloc against `%s': error %d"), |
| 4027 | input_bfd, input_section, |
| 4028 | (long) rel->r_offset, name, (int) r); |
| 4029 | return FALSE; |
| 4030 | } |
| 4031 | } |
| 4032 | } |
| 4033 | |
| 4034 | return TRUE; |
| 4035 | } |
| 4036 | |
| 4037 | /* Finish up dynamic symbol handling. We set the contents of various |
| 4038 | dynamic sections here. */ |
| 4039 | |
| 4040 | static bfd_boolean |
| 4041 | elf_i386_finish_dynamic_symbol (bfd *output_bfd, |
| 4042 | struct bfd_link_info *info, |
| 4043 | struct elf_link_hash_entry *h, |
| 4044 | Elf_Internal_Sym *sym) |
| 4045 | { |
| 4046 | struct elf_i386_link_hash_table *htab; |
| 4047 | |
| 4048 | htab = elf_i386_hash_table (info); |
| 4049 | |
| 4050 | if (h->plt.offset != (bfd_vma) -1) |
| 4051 | { |
| 4052 | bfd_vma plt_index; |
| 4053 | bfd_vma got_offset; |
| 4054 | Elf_Internal_Rela rel; |
| 4055 | bfd_byte *loc; |
| 4056 | asection *plt, *gotplt, *relplt; |
| 4057 | |
| 4058 | /* When building a static executable, use .iplt, .igot.plt and |
| 4059 | .rel.iplt sections for STT_GNU_IFUNC symbols. */ |
| 4060 | if (htab->elf.splt != NULL) |
| 4061 | { |
| 4062 | plt = htab->elf.splt; |
| 4063 | gotplt = htab->elf.sgotplt; |
| 4064 | relplt = htab->elf.srelplt; |
| 4065 | } |
| 4066 | else |
| 4067 | { |
| 4068 | plt = htab->elf.iplt; |
| 4069 | gotplt = htab->elf.igotplt; |
| 4070 | relplt = htab->elf.irelplt; |
| 4071 | } |
| 4072 | |
| 4073 | /* This symbol has an entry in the procedure linkage table. Set |
| 4074 | it up. */ |
| 4075 | |
| 4076 | if ((h->dynindx == -1 |
| 4077 | && !((h->forced_local || info->executable) |
| 4078 | && h->def_regular |
| 4079 | && h->type == STT_GNU_IFUNC)) |
| 4080 | || plt == NULL |
| 4081 | || gotplt == NULL |
| 4082 | || relplt == NULL) |
| 4083 | abort (); |
| 4084 | |
| 4085 | /* Get the index in the procedure linkage table which |
| 4086 | corresponds to this symbol. This is the index of this symbol |
| 4087 | in all the symbols for which we are making plt entries. The |
| 4088 | first entry in the procedure linkage table is reserved. |
| 4089 | |
| 4090 | Get the offset into the .got table of the entry that |
| 4091 | corresponds to this function. Each .got entry is 4 bytes. |
| 4092 | The first three are reserved. |
| 4093 | |
| 4094 | For static executables, we don't reserve anything. */ |
| 4095 | |
| 4096 | if (plt == htab->elf.splt) |
| 4097 | { |
| 4098 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 4099 | got_offset = (plt_index + 3) * 4; |
| 4100 | } |
| 4101 | else |
| 4102 | { |
| 4103 | plt_index = h->plt.offset / PLT_ENTRY_SIZE; |
| 4104 | got_offset = plt_index * 4; |
| 4105 | } |
| 4106 | |
| 4107 | /* Fill in the entry in the procedure linkage table. */ |
| 4108 | if (! info->shared) |
| 4109 | { |
| 4110 | memcpy (plt->contents + h->plt.offset, elf_i386_plt_entry, |
| 4111 | PLT_ENTRY_SIZE); |
| 4112 | bfd_put_32 (output_bfd, |
| 4113 | (gotplt->output_section->vma |
| 4114 | + gotplt->output_offset |
| 4115 | + got_offset), |
| 4116 | plt->contents + h->plt.offset + 2); |
| 4117 | |
| 4118 | if (htab->is_vxworks) |
| 4119 | { |
| 4120 | int s, k, reloc_index; |
| 4121 | |
| 4122 | /* Create the R_386_32 relocation referencing the GOT |
| 4123 | for this PLT entry. */ |
| 4124 | |
| 4125 | /* S: Current slot number (zero-based). */ |
| 4126 | s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE; |
| 4127 | /* K: Number of relocations for PLTResolve. */ |
| 4128 | if (info->shared) |
| 4129 | k = PLTRESOLVE_RELOCS_SHLIB; |
| 4130 | else |
| 4131 | k = PLTRESOLVE_RELOCS; |
| 4132 | /* Skip the PLTresolve relocations, and the relocations for |
| 4133 | the other PLT slots. */ |
| 4134 | reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS; |
| 4135 | loc = (htab->srelplt2->contents + reloc_index |
| 4136 | * sizeof (Elf32_External_Rel)); |
| 4137 | |
| 4138 | rel.r_offset = (htab->elf.splt->output_section->vma |
| 4139 | + htab->elf.splt->output_offset |
| 4140 | + h->plt.offset + 2), |
| 4141 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); |
| 4142 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 4143 | |
| 4144 | /* Create the R_386_32 relocation referencing the beginning of |
| 4145 | the PLT for this GOT entry. */ |
| 4146 | rel.r_offset = (htab->elf.sgotplt->output_section->vma |
| 4147 | + htab->elf.sgotplt->output_offset |
| 4148 | + got_offset); |
| 4149 | rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); |
| 4150 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 4151 | loc + sizeof (Elf32_External_Rel)); |
| 4152 | } |
| 4153 | } |
| 4154 | else |
| 4155 | { |
| 4156 | memcpy (plt->contents + h->plt.offset, elf_i386_pic_plt_entry, |
| 4157 | PLT_ENTRY_SIZE); |
| 4158 | bfd_put_32 (output_bfd, got_offset, |
| 4159 | plt->contents + h->plt.offset + 2); |
| 4160 | } |
| 4161 | |
| 4162 | /* Don't fill PLT entry for static executables. */ |
| 4163 | if (plt == htab->elf.splt) |
| 4164 | { |
| 4165 | bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), |
| 4166 | plt->contents + h->plt.offset + 7); |
| 4167 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| 4168 | plt->contents + h->plt.offset + 12); |
| 4169 | } |
| 4170 | |
| 4171 | /* Fill in the entry in the global offset table. */ |
| 4172 | bfd_put_32 (output_bfd, |
| 4173 | (plt->output_section->vma |
| 4174 | + plt->output_offset |
| 4175 | + h->plt.offset |
| 4176 | + 6), |
| 4177 | gotplt->contents + got_offset); |
| 4178 | |
| 4179 | /* Fill in the entry in the .rel.plt section. */ |
| 4180 | rel.r_offset = (gotplt->output_section->vma |
| 4181 | + gotplt->output_offset |
| 4182 | + got_offset); |
| 4183 | if (h->dynindx == -1 |
| 4184 | || ((info->executable |
| 4185 | || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 4186 | && h->def_regular |
| 4187 | && h->type == STT_GNU_IFUNC)) |
| 4188 | { |
| 4189 | /* If an STT_GNU_IFUNC symbol is locally defined, generate |
| 4190 | R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend |
| 4191 | in the .got.plt section. */ |
| 4192 | bfd_put_32 (output_bfd, |
| 4193 | (h->root.u.def.value |
| 4194 | + h->root.u.def.section->output_section->vma |
| 4195 | + h->root.u.def.section->output_offset), |
| 4196 | gotplt->contents + got_offset); |
| 4197 | rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); |
| 4198 | } |
| 4199 | else |
| 4200 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); |
| 4201 | loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel); |
| 4202 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 4203 | |
| 4204 | if (!h->def_regular) |
| 4205 | { |
| 4206 | /* Mark the symbol as undefined, rather than as defined in |
| 4207 | the .plt section. Leave the value if there were any |
| 4208 | relocations where pointer equality matters (this is a clue |
| 4209 | for the dynamic linker, to make function pointer |
| 4210 | comparisons work between an application and shared |
| 4211 | library), otherwise set it to zero. If a function is only |
| 4212 | called from a binary, there is no need to slow down |
| 4213 | shared libraries because of that. */ |
| 4214 | sym->st_shndx = SHN_UNDEF; |
| 4215 | if (!h->pointer_equality_needed) |
| 4216 | sym->st_value = 0; |
| 4217 | } |
| 4218 | } |
| 4219 | |
| 4220 | if (h->got.offset != (bfd_vma) -1 |
| 4221 | && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type) |
| 4222 | && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0) |
| 4223 | { |
| 4224 | Elf_Internal_Rela rel; |
| 4225 | bfd_byte *loc; |
| 4226 | |
| 4227 | /* This symbol has an entry in the global offset table. Set it |
| 4228 | up. */ |
| 4229 | |
| 4230 | if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) |
| 4231 | abort (); |
| 4232 | |
| 4233 | rel.r_offset = (htab->elf.sgot->output_section->vma |
| 4234 | + htab->elf.sgot->output_offset |
| 4235 | + (h->got.offset & ~(bfd_vma) 1)); |
| 4236 | |
| 4237 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 4238 | symbol is defined locally or was forced to be local because |
| 4239 | of a version file, we just want to emit a RELATIVE reloc. |
| 4240 | The entry in the global offset table will already have been |
| 4241 | initialized in the relocate_section function. */ |
| 4242 | if (h->def_regular |
| 4243 | && h->type == STT_GNU_IFUNC) |
| 4244 | { |
| 4245 | if (info->shared) |
| 4246 | { |
| 4247 | /* Generate R_386_GLOB_DAT. */ |
| 4248 | goto do_glob_dat; |
| 4249 | } |
| 4250 | else |
| 4251 | { |
| 4252 | if (!h->pointer_equality_needed) |
| 4253 | abort (); |
| 4254 | |
| 4255 | /* For non-shared object, we can't use .got.plt, which |
| 4256 | contains the real function addres if we need pointer |
| 4257 | equality. We load the GOT entry with the PLT entry. */ |
| 4258 | asection *plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; |
| 4259 | bfd_put_32 (output_bfd, |
| 4260 | (plt->output_section->vma |
| 4261 | + plt->output_offset + h->plt.offset), |
| 4262 | htab->elf.sgot->contents + h->got.offset); |
| 4263 | return TRUE; |
| 4264 | } |
| 4265 | } |
| 4266 | else if (info->shared |
| 4267 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 4268 | { |
| 4269 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 4270 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 4271 | } |
| 4272 | else |
| 4273 | { |
| 4274 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 4275 | do_glob_dat: |
| 4276 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
| 4277 | htab->elf.sgot->contents + h->got.offset); |
| 4278 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); |
| 4279 | } |
| 4280 | |
| 4281 | loc = htab->elf.srelgot->contents; |
| 4282 | loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel); |
| 4283 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 4284 | } |
| 4285 | |
| 4286 | if (h->needs_copy) |
| 4287 | { |
| 4288 | Elf_Internal_Rela rel; |
| 4289 | bfd_byte *loc; |
| 4290 | |
| 4291 | /* This symbol needs a copy reloc. Set it up. */ |
| 4292 | |
| 4293 | if (h->dynindx == -1 |
| 4294 | || (h->root.type != bfd_link_hash_defined |
| 4295 | && h->root.type != bfd_link_hash_defweak) |
| 4296 | || htab->srelbss == NULL) |
| 4297 | abort (); |
| 4298 | |
| 4299 | rel.r_offset = (h->root.u.def.value |
| 4300 | + h->root.u.def.section->output_section->vma |
| 4301 | + h->root.u.def.section->output_offset); |
| 4302 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); |
| 4303 | loc = htab->srelbss->contents; |
| 4304 | loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel); |
| 4305 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 4306 | } |
| 4307 | |
| 4308 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may |
| 4309 | be NULL for local symbols. |
| 4310 | |
| 4311 | On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it |
| 4312 | is relative to the ".got" section. */ |
| 4313 | if (sym != NULL |
| 4314 | && (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 4315 | || (!htab->is_vxworks && h == htab->elf.hgot))) |
| 4316 | sym->st_shndx = SHN_ABS; |
| 4317 | |
| 4318 | return TRUE; |
| 4319 | } |
| 4320 | |
| 4321 | /* Finish up local dynamic symbol handling. We set the contents of |
| 4322 | various dynamic sections here. */ |
| 4323 | |
| 4324 | static bfd_boolean |
| 4325 | elf_i386_finish_local_dynamic_symbol (void **slot, void *inf) |
| 4326 | { |
| 4327 | struct elf_link_hash_entry *h |
| 4328 | = (struct elf_link_hash_entry *) *slot; |
| 4329 | struct bfd_link_info *info |
| 4330 | = (struct bfd_link_info *) inf; |
| 4331 | |
| 4332 | return elf_i386_finish_dynamic_symbol (info->output_bfd, info, |
| 4333 | h, NULL); |
| 4334 | } |
| 4335 | |
| 4336 | /* Used to decide how to sort relocs in an optimal manner for the |
| 4337 | dynamic linker, before writing them out. */ |
| 4338 | |
| 4339 | static enum elf_reloc_type_class |
| 4340 | elf_i386_reloc_type_class (const Elf_Internal_Rela *rela) |
| 4341 | { |
| 4342 | switch (ELF32_R_TYPE (rela->r_info)) |
| 4343 | { |
| 4344 | case R_386_RELATIVE: |
| 4345 | return reloc_class_relative; |
| 4346 | case R_386_JUMP_SLOT: |
| 4347 | return reloc_class_plt; |
| 4348 | case R_386_COPY: |
| 4349 | return reloc_class_copy; |
| 4350 | default: |
| 4351 | return reloc_class_normal; |
| 4352 | } |
| 4353 | } |
| 4354 | |
| 4355 | /* Finish up the dynamic sections. */ |
| 4356 | |
| 4357 | static bfd_boolean |
| 4358 | elf_i386_finish_dynamic_sections (bfd *output_bfd, |
| 4359 | struct bfd_link_info *info) |
| 4360 | { |
| 4361 | struct elf_i386_link_hash_table *htab; |
| 4362 | bfd *dynobj; |
| 4363 | asection *sdyn; |
| 4364 | |
| 4365 | htab = elf_i386_hash_table (info); |
| 4366 | dynobj = htab->elf.dynobj; |
| 4367 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 4368 | |
| 4369 | if (htab->elf.dynamic_sections_created) |
| 4370 | { |
| 4371 | Elf32_External_Dyn *dyncon, *dynconend; |
| 4372 | |
| 4373 | if (sdyn == NULL || htab->elf.sgot == NULL) |
| 4374 | abort (); |
| 4375 | |
| 4376 | dyncon = (Elf32_External_Dyn *) sdyn->contents; |
| 4377 | dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); |
| 4378 | for (; dyncon < dynconend; dyncon++) |
| 4379 | { |
| 4380 | Elf_Internal_Dyn dyn; |
| 4381 | asection *s; |
| 4382 | |
| 4383 | bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); |
| 4384 | |
| 4385 | switch (dyn.d_tag) |
| 4386 | { |
| 4387 | default: |
| 4388 | if (htab->is_vxworks |
| 4389 | && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn)) |
| 4390 | break; |
| 4391 | continue; |
| 4392 | |
| 4393 | case DT_PLTGOT: |
| 4394 | s = htab->elf.sgotplt; |
| 4395 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 4396 | break; |
| 4397 | |
| 4398 | case DT_JMPREL: |
| 4399 | s = htab->elf.srelplt; |
| 4400 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 4401 | break; |
| 4402 | |
| 4403 | case DT_PLTRELSZ: |
| 4404 | s = htab->elf.srelplt; |
| 4405 | dyn.d_un.d_val = s->size; |
| 4406 | break; |
| 4407 | |
| 4408 | case DT_RELSZ: |
| 4409 | /* My reading of the SVR4 ABI indicates that the |
| 4410 | procedure linkage table relocs (DT_JMPREL) should be |
| 4411 | included in the overall relocs (DT_REL). This is |
| 4412 | what Solaris does. However, UnixWare can not handle |
| 4413 | that case. Therefore, we override the DT_RELSZ entry |
| 4414 | here to make it not include the JMPREL relocs. */ |
| 4415 | s = htab->elf.srelplt; |
| 4416 | if (s == NULL) |
| 4417 | continue; |
| 4418 | dyn.d_un.d_val -= s->size; |
| 4419 | break; |
| 4420 | |
| 4421 | case DT_REL: |
| 4422 | /* We may not be using the standard ELF linker script. |
| 4423 | If .rel.plt is the first .rel section, we adjust |
| 4424 | DT_REL to not include it. */ |
| 4425 | s = htab->elf.srelplt; |
| 4426 | if (s == NULL) |
| 4427 | continue; |
| 4428 | if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) |
| 4429 | continue; |
| 4430 | dyn.d_un.d_ptr += s->size; |
| 4431 | break; |
| 4432 | } |
| 4433 | |
| 4434 | bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 4435 | } |
| 4436 | |
| 4437 | /* Fill in the first entry in the procedure linkage table. */ |
| 4438 | if (htab->elf.splt && htab->elf.splt->size > 0) |
| 4439 | { |
| 4440 | if (info->shared) |
| 4441 | { |
| 4442 | memcpy (htab->elf.splt->contents, elf_i386_pic_plt0_entry, |
| 4443 | sizeof (elf_i386_pic_plt0_entry)); |
| 4444 | memset (htab->elf.splt->contents + sizeof (elf_i386_pic_plt0_entry), |
| 4445 | htab->plt0_pad_byte, |
| 4446 | PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry)); |
| 4447 | } |
| 4448 | else |
| 4449 | { |
| 4450 | memcpy (htab->elf.splt->contents, elf_i386_plt0_entry, |
| 4451 | sizeof(elf_i386_plt0_entry)); |
| 4452 | memset (htab->elf.splt->contents + sizeof (elf_i386_plt0_entry), |
| 4453 | htab->plt0_pad_byte, |
| 4454 | PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry)); |
| 4455 | bfd_put_32 (output_bfd, |
| 4456 | (htab->elf.sgotplt->output_section->vma |
| 4457 | + htab->elf.sgotplt->output_offset |
| 4458 | + 4), |
| 4459 | htab->elf.splt->contents + 2); |
| 4460 | bfd_put_32 (output_bfd, |
| 4461 | (htab->elf.sgotplt->output_section->vma |
| 4462 | + htab->elf.sgotplt->output_offset |
| 4463 | + 8), |
| 4464 | htab->elf.splt->contents + 8); |
| 4465 | |
| 4466 | if (htab->is_vxworks) |
| 4467 | { |
| 4468 | Elf_Internal_Rela rel; |
| 4469 | |
| 4470 | /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4. |
| 4471 | On IA32 we use REL relocations so the addend goes in |
| 4472 | the PLT directly. */ |
| 4473 | rel.r_offset = (htab->elf.splt->output_section->vma |
| 4474 | + htab->elf.splt->output_offset |
| 4475 | + 2); |
| 4476 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); |
| 4477 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 4478 | htab->srelplt2->contents); |
| 4479 | /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */ |
| 4480 | rel.r_offset = (htab->elf.splt->output_section->vma |
| 4481 | + htab->elf.splt->output_offset |
| 4482 | + 8); |
| 4483 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); |
| 4484 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 4485 | htab->srelplt2->contents + |
| 4486 | sizeof (Elf32_External_Rel)); |
| 4487 | } |
| 4488 | } |
| 4489 | |
| 4490 | /* UnixWare sets the entsize of .plt to 4, although that doesn't |
| 4491 | really seem like the right value. */ |
| 4492 | elf_section_data (htab->elf.splt->output_section) |
| 4493 | ->this_hdr.sh_entsize = 4; |
| 4494 | |
| 4495 | /* Correct the .rel.plt.unloaded relocations. */ |
| 4496 | if (htab->is_vxworks && !info->shared) |
| 4497 | { |
| 4498 | int num_plts = (htab->elf.splt->size / PLT_ENTRY_SIZE) - 1; |
| 4499 | unsigned char *p; |
| 4500 | |
| 4501 | p = htab->srelplt2->contents; |
| 4502 | if (info->shared) |
| 4503 | p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel); |
| 4504 | else |
| 4505 | p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel); |
| 4506 | |
| 4507 | for (; num_plts; num_plts--) |
| 4508 | { |
| 4509 | Elf_Internal_Rela rel; |
| 4510 | bfd_elf32_swap_reloc_in (output_bfd, p, &rel); |
| 4511 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); |
| 4512 | bfd_elf32_swap_reloc_out (output_bfd, &rel, p); |
| 4513 | p += sizeof (Elf32_External_Rel); |
| 4514 | |
| 4515 | bfd_elf32_swap_reloc_in (output_bfd, p, &rel); |
| 4516 | rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); |
| 4517 | bfd_elf32_swap_reloc_out (output_bfd, &rel, p); |
| 4518 | p += sizeof (Elf32_External_Rel); |
| 4519 | } |
| 4520 | } |
| 4521 | } |
| 4522 | } |
| 4523 | |
| 4524 | if (htab->elf.sgotplt) |
| 4525 | { |
| 4526 | /* Fill in the first three entries in the global offset table. */ |
| 4527 | if (htab->elf.sgotplt->size > 0) |
| 4528 | { |
| 4529 | bfd_put_32 (output_bfd, |
| 4530 | (sdyn == NULL ? 0 |
| 4531 | : sdyn->output_section->vma + sdyn->output_offset), |
| 4532 | htab->elf.sgotplt->contents); |
| 4533 | bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4); |
| 4534 | bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8); |
| 4535 | } |
| 4536 | |
| 4537 | elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4; |
| 4538 | } |
| 4539 | |
| 4540 | if (htab->elf.sgot && htab->elf.sgot->size > 0) |
| 4541 | elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4; |
| 4542 | |
| 4543 | /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ |
| 4544 | htab_traverse (htab->loc_hash_table, |
| 4545 | elf_i386_finish_local_dynamic_symbol, |
| 4546 | info); |
| 4547 | |
| 4548 | return TRUE; |
| 4549 | } |
| 4550 | |
| 4551 | /* Return address for Ith PLT stub in section PLT, for relocation REL |
| 4552 | or (bfd_vma) -1 if it should not be included. */ |
| 4553 | |
| 4554 | static bfd_vma |
| 4555 | elf_i386_plt_sym_val (bfd_vma i, const asection *plt, |
| 4556 | const arelent *rel ATTRIBUTE_UNUSED) |
| 4557 | { |
| 4558 | return plt->vma + (i + 1) * PLT_ENTRY_SIZE; |
| 4559 | } |
| 4560 | |
| 4561 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ |
| 4562 | |
| 4563 | static bfd_boolean |
| 4564 | elf_i386_hash_symbol (struct elf_link_hash_entry *h) |
| 4565 | { |
| 4566 | if (h->plt.offset != (bfd_vma) -1 |
| 4567 | && !h->def_regular |
| 4568 | && !h->pointer_equality_needed) |
| 4569 | return FALSE; |
| 4570 | |
| 4571 | return _bfd_elf_hash_symbol (h); |
| 4572 | } |
| 4573 | |
| 4574 | /* Hook called by the linker routine which adds symbols from an object |
| 4575 | file. */ |
| 4576 | |
| 4577 | static bfd_boolean |
| 4578 | elf_i386_add_symbol_hook (bfd * abfd ATTRIBUTE_UNUSED, |
| 4579 | struct bfd_link_info * info ATTRIBUTE_UNUSED, |
| 4580 | Elf_Internal_Sym * sym, |
| 4581 | const char ** namep ATTRIBUTE_UNUSED, |
| 4582 | flagword * flagsp ATTRIBUTE_UNUSED, |
| 4583 | asection ** secp ATTRIBUTE_UNUSED, |
| 4584 | bfd_vma * valp ATTRIBUTE_UNUSED) |
| 4585 | { |
| 4586 | if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) |
| 4587 | elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE; |
| 4588 | |
| 4589 | return TRUE; |
| 4590 | } |
| 4591 | |
| 4592 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vec |
| 4593 | #define TARGET_LITTLE_NAME "elf32-i386" |
| 4594 | #define ELF_ARCH bfd_arch_i386 |
| 4595 | #define ELF_MACHINE_CODE EM_386 |
| 4596 | #define ELF_MAXPAGESIZE 0x1000 |
| 4597 | |
| 4598 | #define elf_backend_can_gc_sections 1 |
| 4599 | #define elf_backend_can_refcount 1 |
| 4600 | #define elf_backend_want_got_plt 1 |
| 4601 | #define elf_backend_plt_readonly 1 |
| 4602 | #define elf_backend_want_plt_sym 0 |
| 4603 | #define elf_backend_got_header_size 12 |
| 4604 | |
| 4605 | /* Support RELA for objdump of prelink objects. */ |
| 4606 | #define elf_info_to_howto elf_i386_info_to_howto_rel |
| 4607 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel |
| 4608 | |
| 4609 | #define bfd_elf32_mkobject elf_i386_mkobject |
| 4610 | |
| 4611 | #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name |
| 4612 | #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create |
| 4613 | #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free |
| 4614 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup |
| 4615 | #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup |
| 4616 | |
| 4617 | #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol |
| 4618 | #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible |
| 4619 | #define elf_backend_check_relocs elf_i386_check_relocs |
| 4620 | #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol |
| 4621 | #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections |
| 4622 | #define elf_backend_fake_sections elf_i386_fake_sections |
| 4623 | #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections |
| 4624 | #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol |
| 4625 | #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook |
| 4626 | #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook |
| 4627 | #define elf_backend_grok_prstatus elf_i386_grok_prstatus |
| 4628 | #define elf_backend_grok_psinfo elf_i386_grok_psinfo |
| 4629 | #define elf_backend_reloc_type_class elf_i386_reloc_type_class |
| 4630 | #define elf_backend_relocate_section elf_i386_relocate_section |
| 4631 | #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections |
| 4632 | #define elf_backend_always_size_sections elf_i386_always_size_sections |
| 4633 | #define elf_backend_omit_section_dynsym \ |
| 4634 | ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) |
| 4635 | #define elf_backend_plt_sym_val elf_i386_plt_sym_val |
| 4636 | #define elf_backend_hash_symbol elf_i386_hash_symbol |
| 4637 | #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook |
| 4638 | #undef elf_backend_post_process_headers |
| 4639 | #define elf_backend_post_process_headers _bfd_elf_set_osabi |
| 4640 | |
| 4641 | #include "elf32-target.h" |
| 4642 | |
| 4643 | /* FreeBSD support. */ |
| 4644 | |
| 4645 | #undef TARGET_LITTLE_SYM |
| 4646 | #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec |
| 4647 | #undef TARGET_LITTLE_NAME |
| 4648 | #define TARGET_LITTLE_NAME "elf32-i386-freebsd" |
| 4649 | #undef ELF_OSABI |
| 4650 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 4651 | |
| 4652 | /* The kernel recognizes executables as valid only if they carry a |
| 4653 | "FreeBSD" label in the ELF header. So we put this label on all |
| 4654 | executables and (for simplicity) also all other object files. */ |
| 4655 | |
| 4656 | static void |
| 4657 | elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info) |
| 4658 | { |
| 4659 | _bfd_elf_set_osabi (abfd, info); |
| 4660 | |
| 4661 | #ifdef OLD_FREEBSD_ABI_LABEL |
| 4662 | /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ |
| 4663 | memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); |
| 4664 | #endif |
| 4665 | } |
| 4666 | |
| 4667 | #undef elf_backend_post_process_headers |
| 4668 | #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers |
| 4669 | #undef elf32_bed |
| 4670 | #define elf32_bed elf32_i386_fbsd_bed |
| 4671 | |
| 4672 | #undef elf_backend_add_symbol_hook |
| 4673 | |
| 4674 | #include "elf32-target.h" |
| 4675 | |
| 4676 | /* VxWorks support. */ |
| 4677 | |
| 4678 | #undef TARGET_LITTLE_SYM |
| 4679 | #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec |
| 4680 | #undef TARGET_LITTLE_NAME |
| 4681 | #define TARGET_LITTLE_NAME "elf32-i386-vxworks" |
| 4682 | #undef ELF_OSABI |
| 4683 | |
| 4684 | /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */ |
| 4685 | |
| 4686 | static struct bfd_link_hash_table * |
| 4687 | elf_i386_vxworks_link_hash_table_create (bfd *abfd) |
| 4688 | { |
| 4689 | struct bfd_link_hash_table *ret; |
| 4690 | struct elf_i386_link_hash_table *htab; |
| 4691 | |
| 4692 | ret = elf_i386_link_hash_table_create (abfd); |
| 4693 | if (ret) |
| 4694 | { |
| 4695 | htab = (struct elf_i386_link_hash_table *) ret; |
| 4696 | htab->is_vxworks = 1; |
| 4697 | htab->plt0_pad_byte = 0x90; |
| 4698 | } |
| 4699 | |
| 4700 | return ret; |
| 4701 | } |
| 4702 | |
| 4703 | |
| 4704 | #undef elf_backend_relocs_compatible |
| 4705 | #undef elf_backend_post_process_headers |
| 4706 | #undef bfd_elf32_bfd_link_hash_table_create |
| 4707 | #define bfd_elf32_bfd_link_hash_table_create \ |
| 4708 | elf_i386_vxworks_link_hash_table_create |
| 4709 | #undef elf_backend_add_symbol_hook |
| 4710 | #define elf_backend_add_symbol_hook \ |
| 4711 | elf_vxworks_add_symbol_hook |
| 4712 | #undef elf_backend_link_output_symbol_hook |
| 4713 | #define elf_backend_link_output_symbol_hook \ |
| 4714 | elf_vxworks_link_output_symbol_hook |
| 4715 | #undef elf_backend_emit_relocs |
| 4716 | #define elf_backend_emit_relocs elf_vxworks_emit_relocs |
| 4717 | #undef elf_backend_final_write_processing |
| 4718 | #define elf_backend_final_write_processing \ |
| 4719 | elf_vxworks_final_write_processing |
| 4720 | |
| 4721 | /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so |
| 4722 | define it. */ |
| 4723 | #undef elf_backend_want_plt_sym |
| 4724 | #define elf_backend_want_plt_sym 1 |
| 4725 | |
| 4726 | #undef elf32_bed |
| 4727 | #define elf32_bed elf32_i386_vxworks_bed |
| 4728 | |
| 4729 | #include "elf32-target.h" |