| 1 | /* Intel 80386/80486-specific support for 32-bit ELF |
| 2 | Copyright (C) 1993-2019 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of BFD, the Binary File Descriptor library. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 19 | MA 02110-1301, USA. */ |
| 20 | |
| 21 | #include "elfxx-x86.h" |
| 22 | #include "elf-nacl.h" |
| 23 | #include "elf-vxworks.h" |
| 24 | #include "dwarf2.h" |
| 25 | #include "opcode/i386.h" |
| 26 | |
| 27 | /* 386 uses REL relocations instead of RELA. */ |
| 28 | #define USE_REL 1 |
| 29 | |
| 30 | #include "elf/i386.h" |
| 31 | |
| 32 | static reloc_howto_type elf_howto_table[]= |
| 33 | { |
| 34 | HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont, |
| 35 | bfd_elf_generic_reloc, "R_386_NONE", |
| 36 | TRUE, 0x00000000, 0x00000000, FALSE), |
| 37 | HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 38 | bfd_elf_generic_reloc, "R_386_32", |
| 39 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 40 | HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 41 | bfd_elf_generic_reloc, "R_386_PC32", |
| 42 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 43 | HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 44 | bfd_elf_generic_reloc, "R_386_GOT32", |
| 45 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 46 | HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 47 | bfd_elf_generic_reloc, "R_386_PLT32", |
| 48 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 49 | HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 50 | bfd_elf_generic_reloc, "R_386_COPY", |
| 51 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 52 | HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 53 | bfd_elf_generic_reloc, "R_386_GLOB_DAT", |
| 54 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 55 | HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 56 | bfd_elf_generic_reloc, "R_386_JUMP_SLOT", |
| 57 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 58 | HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 59 | bfd_elf_generic_reloc, "R_386_RELATIVE", |
| 60 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 61 | HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 62 | bfd_elf_generic_reloc, "R_386_GOTOFF", |
| 63 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 64 | HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, |
| 65 | bfd_elf_generic_reloc, "R_386_GOTPC", |
| 66 | TRUE, 0xffffffff, 0xffffffff, TRUE), |
| 67 | |
| 68 | /* We have a gap in the reloc numbers here. |
| 69 | R_386_standard counts the number up to this point, and |
| 70 | R_386_ext_offset is the value to subtract from a reloc type of |
| 71 | R_386_16 thru R_386_PC8 to form an index into this table. */ |
| 72 | #define R_386_standard (R_386_GOTPC + 1) |
| 73 | #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard) |
| 74 | |
| 75 | /* These relocs are a GNU extension. */ |
| 76 | HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 77 | bfd_elf_generic_reloc, "R_386_TLS_TPOFF", |
| 78 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 79 | HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 80 | bfd_elf_generic_reloc, "R_386_TLS_IE", |
| 81 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 82 | HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 83 | bfd_elf_generic_reloc, "R_386_TLS_GOTIE", |
| 84 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 85 | HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 86 | bfd_elf_generic_reloc, "R_386_TLS_LE", |
| 87 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 88 | HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 89 | bfd_elf_generic_reloc, "R_386_TLS_GD", |
| 90 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 91 | HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 92 | bfd_elf_generic_reloc, "R_386_TLS_LDM", |
| 93 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 94 | HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, |
| 95 | bfd_elf_generic_reloc, "R_386_16", |
| 96 | TRUE, 0xffff, 0xffff, FALSE), |
| 97 | HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield, |
| 98 | bfd_elf_generic_reloc, "R_386_PC16", |
| 99 | TRUE, 0xffff, 0xffff, TRUE), |
| 100 | HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, |
| 101 | bfd_elf_generic_reloc, "R_386_8", |
| 102 | TRUE, 0xff, 0xff, FALSE), |
| 103 | HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, |
| 104 | bfd_elf_generic_reloc, "R_386_PC8", |
| 105 | TRUE, 0xff, 0xff, TRUE), |
| 106 | |
| 107 | #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset) |
| 108 | #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext) |
| 109 | /* These are common with Solaris TLS implementation. */ |
| 110 | HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 111 | bfd_elf_generic_reloc, "R_386_TLS_LDO_32", |
| 112 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 113 | HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 114 | bfd_elf_generic_reloc, "R_386_TLS_IE_32", |
| 115 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 116 | HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 117 | bfd_elf_generic_reloc, "R_386_TLS_LE_32", |
| 118 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 119 | HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 120 | bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32", |
| 121 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 122 | HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 123 | bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32", |
| 124 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 125 | HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 126 | bfd_elf_generic_reloc, "R_386_TLS_TPOFF32", |
| 127 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 128 | HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, |
| 129 | bfd_elf_generic_reloc, "R_386_SIZE32", |
| 130 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 131 | HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 132 | bfd_elf_generic_reloc, "R_386_TLS_GOTDESC", |
| 133 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 134 | HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, |
| 135 | bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL", |
| 136 | FALSE, 0, 0, FALSE), |
| 137 | HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 138 | bfd_elf_generic_reloc, "R_386_TLS_DESC", |
| 139 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 140 | HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 141 | bfd_elf_generic_reloc, "R_386_IRELATIVE", |
| 142 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 143 | HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 144 | bfd_elf_generic_reloc, "R_386_GOT32X", |
| 145 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 146 | |
| 147 | /* Another gap. */ |
| 148 | #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset) |
| 149 | #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2) |
| 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 | #define X86_PCREL_TYPE_P(TYPE) ((TYPE) == R_386_PC32) |
| 186 | |
| 187 | #define X86_SIZE_TYPE_P(TYPE) ((TYPE) == R_386_SIZE32) |
| 188 | |
| 189 | #ifdef DEBUG_GEN_RELOC |
| 190 | #define TRACE(str) \ |
| 191 | fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str) |
| 192 | #else |
| 193 | #define TRACE(str) |
| 194 | #endif |
| 195 | |
| 196 | static reloc_howto_type * |
| 197 | elf_i386_reloc_type_lookup (bfd *abfd, |
| 198 | bfd_reloc_code_real_type code) |
| 199 | { |
| 200 | switch (code) |
| 201 | { |
| 202 | case BFD_RELOC_NONE: |
| 203 | TRACE ("BFD_RELOC_NONE"); |
| 204 | return &elf_howto_table[R_386_NONE]; |
| 205 | |
| 206 | case BFD_RELOC_32: |
| 207 | TRACE ("BFD_RELOC_32"); |
| 208 | return &elf_howto_table[R_386_32]; |
| 209 | |
| 210 | case BFD_RELOC_CTOR: |
| 211 | TRACE ("BFD_RELOC_CTOR"); |
| 212 | return &elf_howto_table[R_386_32]; |
| 213 | |
| 214 | case BFD_RELOC_32_PCREL: |
| 215 | TRACE ("BFD_RELOC_PC32"); |
| 216 | return &elf_howto_table[R_386_PC32]; |
| 217 | |
| 218 | case BFD_RELOC_386_GOT32: |
| 219 | TRACE ("BFD_RELOC_386_GOT32"); |
| 220 | return &elf_howto_table[R_386_GOT32]; |
| 221 | |
| 222 | case BFD_RELOC_386_PLT32: |
| 223 | TRACE ("BFD_RELOC_386_PLT32"); |
| 224 | return &elf_howto_table[R_386_PLT32]; |
| 225 | |
| 226 | case BFD_RELOC_386_COPY: |
| 227 | TRACE ("BFD_RELOC_386_COPY"); |
| 228 | return &elf_howto_table[R_386_COPY]; |
| 229 | |
| 230 | case BFD_RELOC_386_GLOB_DAT: |
| 231 | TRACE ("BFD_RELOC_386_GLOB_DAT"); |
| 232 | return &elf_howto_table[R_386_GLOB_DAT]; |
| 233 | |
| 234 | case BFD_RELOC_386_JUMP_SLOT: |
| 235 | TRACE ("BFD_RELOC_386_JUMP_SLOT"); |
| 236 | return &elf_howto_table[R_386_JUMP_SLOT]; |
| 237 | |
| 238 | case BFD_RELOC_386_RELATIVE: |
| 239 | TRACE ("BFD_RELOC_386_RELATIVE"); |
| 240 | return &elf_howto_table[R_386_RELATIVE]; |
| 241 | |
| 242 | case BFD_RELOC_386_GOTOFF: |
| 243 | TRACE ("BFD_RELOC_386_GOTOFF"); |
| 244 | return &elf_howto_table[R_386_GOTOFF]; |
| 245 | |
| 246 | case BFD_RELOC_386_GOTPC: |
| 247 | TRACE ("BFD_RELOC_386_GOTPC"); |
| 248 | return &elf_howto_table[R_386_GOTPC]; |
| 249 | |
| 250 | /* These relocs are a GNU extension. */ |
| 251 | case BFD_RELOC_386_TLS_TPOFF: |
| 252 | TRACE ("BFD_RELOC_386_TLS_TPOFF"); |
| 253 | return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset]; |
| 254 | |
| 255 | case BFD_RELOC_386_TLS_IE: |
| 256 | TRACE ("BFD_RELOC_386_TLS_IE"); |
| 257 | return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset]; |
| 258 | |
| 259 | case BFD_RELOC_386_TLS_GOTIE: |
| 260 | TRACE ("BFD_RELOC_386_TLS_GOTIE"); |
| 261 | return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset]; |
| 262 | |
| 263 | case BFD_RELOC_386_TLS_LE: |
| 264 | TRACE ("BFD_RELOC_386_TLS_LE"); |
| 265 | return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset]; |
| 266 | |
| 267 | case BFD_RELOC_386_TLS_GD: |
| 268 | TRACE ("BFD_RELOC_386_TLS_GD"); |
| 269 | return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset]; |
| 270 | |
| 271 | case BFD_RELOC_386_TLS_LDM: |
| 272 | TRACE ("BFD_RELOC_386_TLS_LDM"); |
| 273 | return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset]; |
| 274 | |
| 275 | case BFD_RELOC_16: |
| 276 | TRACE ("BFD_RELOC_16"); |
| 277 | return &elf_howto_table[R_386_16 - R_386_ext_offset]; |
| 278 | |
| 279 | case BFD_RELOC_16_PCREL: |
| 280 | TRACE ("BFD_RELOC_16_PCREL"); |
| 281 | return &elf_howto_table[R_386_PC16 - R_386_ext_offset]; |
| 282 | |
| 283 | case BFD_RELOC_8: |
| 284 | TRACE ("BFD_RELOC_8"); |
| 285 | return &elf_howto_table[R_386_8 - R_386_ext_offset]; |
| 286 | |
| 287 | case BFD_RELOC_8_PCREL: |
| 288 | TRACE ("BFD_RELOC_8_PCREL"); |
| 289 | return &elf_howto_table[R_386_PC8 - R_386_ext_offset]; |
| 290 | |
| 291 | /* Common with Sun TLS implementation. */ |
| 292 | case BFD_RELOC_386_TLS_LDO_32: |
| 293 | TRACE ("BFD_RELOC_386_TLS_LDO_32"); |
| 294 | return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset]; |
| 295 | |
| 296 | case BFD_RELOC_386_TLS_IE_32: |
| 297 | TRACE ("BFD_RELOC_386_TLS_IE_32"); |
| 298 | return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset]; |
| 299 | |
| 300 | case BFD_RELOC_386_TLS_LE_32: |
| 301 | TRACE ("BFD_RELOC_386_TLS_LE_32"); |
| 302 | return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset]; |
| 303 | |
| 304 | case BFD_RELOC_386_TLS_DTPMOD32: |
| 305 | TRACE ("BFD_RELOC_386_TLS_DTPMOD32"); |
| 306 | return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset]; |
| 307 | |
| 308 | case BFD_RELOC_386_TLS_DTPOFF32: |
| 309 | TRACE ("BFD_RELOC_386_TLS_DTPOFF32"); |
| 310 | return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset]; |
| 311 | |
| 312 | case BFD_RELOC_386_TLS_TPOFF32: |
| 313 | TRACE ("BFD_RELOC_386_TLS_TPOFF32"); |
| 314 | return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset]; |
| 315 | |
| 316 | case BFD_RELOC_SIZE32: |
| 317 | TRACE ("BFD_RELOC_SIZE32"); |
| 318 | return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset]; |
| 319 | |
| 320 | case BFD_RELOC_386_TLS_GOTDESC: |
| 321 | TRACE ("BFD_RELOC_386_TLS_GOTDESC"); |
| 322 | return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset]; |
| 323 | |
| 324 | case BFD_RELOC_386_TLS_DESC_CALL: |
| 325 | TRACE ("BFD_RELOC_386_TLS_DESC_CALL"); |
| 326 | return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset]; |
| 327 | |
| 328 | case BFD_RELOC_386_TLS_DESC: |
| 329 | TRACE ("BFD_RELOC_386_TLS_DESC"); |
| 330 | return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset]; |
| 331 | |
| 332 | case BFD_RELOC_386_IRELATIVE: |
| 333 | TRACE ("BFD_RELOC_386_IRELATIVE"); |
| 334 | return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset]; |
| 335 | |
| 336 | case BFD_RELOC_386_GOT32X: |
| 337 | TRACE ("BFD_RELOC_386_GOT32X"); |
| 338 | return &elf_howto_table[R_386_GOT32X - R_386_tls_offset]; |
| 339 | |
| 340 | case BFD_RELOC_VTABLE_INHERIT: |
| 341 | TRACE ("BFD_RELOC_VTABLE_INHERIT"); |
| 342 | return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset]; |
| 343 | |
| 344 | case BFD_RELOC_VTABLE_ENTRY: |
| 345 | TRACE ("BFD_RELOC_VTABLE_ENTRY"); |
| 346 | return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset]; |
| 347 | |
| 348 | default: |
| 349 | TRACE ("Unknown"); |
| 350 | /* xgettext:c-format */ |
| 351 | _bfd_error_handler (_("%pB: unsupported relocation type: %#x"), |
| 352 | abfd, (int) code); |
| 353 | bfd_set_error (bfd_error_bad_value); |
| 354 | return NULL; |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | static reloc_howto_type * |
| 359 | elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 360 | const char *r_name) |
| 361 | { |
| 362 | unsigned int i; |
| 363 | |
| 364 | for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) |
| 365 | if (elf_howto_table[i].name != NULL |
| 366 | && strcasecmp (elf_howto_table[i].name, r_name) == 0) |
| 367 | return &elf_howto_table[i]; |
| 368 | |
| 369 | return NULL; |
| 370 | } |
| 371 | |
| 372 | static reloc_howto_type * |
| 373 | elf_i386_rtype_to_howto (unsigned r_type) |
| 374 | { |
| 375 | unsigned int indx; |
| 376 | |
| 377 | if ((indx = r_type) >= R_386_standard |
| 378 | && ((indx = r_type - R_386_ext_offset) - R_386_standard |
| 379 | >= R_386_ext - R_386_standard) |
| 380 | && ((indx = r_type - R_386_tls_offset) - R_386_ext |
| 381 | >= R_386_ext2 - R_386_ext) |
| 382 | && ((indx = r_type - R_386_vt_offset) - R_386_ext2 |
| 383 | >= R_386_vt - R_386_ext2)) |
| 384 | return NULL; |
| 385 | /* PR 17512: file: 0f67f69d. */ |
| 386 | if (elf_howto_table [indx].type != r_type) |
| 387 | return NULL; |
| 388 | return &elf_howto_table[indx]; |
| 389 | } |
| 390 | |
| 391 | static bfd_boolean |
| 392 | elf_i386_info_to_howto_rel (bfd *abfd, |
| 393 | arelent *cache_ptr, |
| 394 | Elf_Internal_Rela *dst) |
| 395 | { |
| 396 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
| 397 | |
| 398 | if ((cache_ptr->howto = elf_i386_rtype_to_howto (r_type)) == NULL) |
| 399 | { |
| 400 | /* xgettext:c-format */ |
| 401 | _bfd_error_handler (_("%pB: unsupported relocation type %#x"), |
| 402 | abfd, r_type); |
| 403 | bfd_set_error (bfd_error_bad_value); |
| 404 | return FALSE; |
| 405 | } |
| 406 | |
| 407 | return TRUE; |
| 408 | } |
| 409 | |
| 410 | /* Return whether a symbol name implies a local label. The UnixWare |
| 411 | 2.1 cc generates temporary symbols that start with .X, so we |
| 412 | recognize them here. FIXME: do other SVR4 compilers also use .X?. |
| 413 | If so, we should move the .X recognition into |
| 414 | _bfd_elf_is_local_label_name. */ |
| 415 | |
| 416 | static bfd_boolean |
| 417 | elf_i386_is_local_label_name (bfd *abfd, const char *name) |
| 418 | { |
| 419 | if (name[0] == '.' && name[1] == 'X') |
| 420 | return TRUE; |
| 421 | |
| 422 | return _bfd_elf_is_local_label_name (abfd, name); |
| 423 | } |
| 424 | \f |
| 425 | /* Support for core dump NOTE sections. */ |
| 426 | |
| 427 | static bfd_boolean |
| 428 | elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 429 | { |
| 430 | int offset; |
| 431 | size_t size; |
| 432 | |
| 433 | if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) |
| 434 | { |
| 435 | int pr_version = bfd_get_32 (abfd, note->descdata); |
| 436 | |
| 437 | if (pr_version != 1) |
| 438 | return FALSE; |
| 439 | |
| 440 | /* pr_cursig */ |
| 441 | elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20); |
| 442 | |
| 443 | /* pr_pid */ |
| 444 | elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); |
| 445 | |
| 446 | /* pr_reg */ |
| 447 | offset = 28; |
| 448 | size = bfd_get_32 (abfd, note->descdata + 8); |
| 449 | } |
| 450 | else |
| 451 | { |
| 452 | switch (note->descsz) |
| 453 | { |
| 454 | default: |
| 455 | return FALSE; |
| 456 | |
| 457 | case 144: /* Linux/i386 */ |
| 458 | /* pr_cursig */ |
| 459 | elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); |
| 460 | |
| 461 | /* pr_pid */ |
| 462 | elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); |
| 463 | |
| 464 | /* pr_reg */ |
| 465 | offset = 72; |
| 466 | size = 68; |
| 467 | |
| 468 | break; |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | /* Make a ".reg/999" section. */ |
| 473 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 474 | size, note->descpos + offset); |
| 475 | } |
| 476 | |
| 477 | static bfd_boolean |
| 478 | elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 479 | { |
| 480 | if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0) |
| 481 | { |
| 482 | int pr_version = bfd_get_32 (abfd, note->descdata); |
| 483 | |
| 484 | if (pr_version != 1) |
| 485 | return FALSE; |
| 486 | |
| 487 | elf_tdata (abfd)->core->program |
| 488 | = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17); |
| 489 | elf_tdata (abfd)->core->command |
| 490 | = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81); |
| 491 | } |
| 492 | else |
| 493 | { |
| 494 | switch (note->descsz) |
| 495 | { |
| 496 | default: |
| 497 | return FALSE; |
| 498 | |
| 499 | case 124: /* Linux/i386 elf_prpsinfo. */ |
| 500 | elf_tdata (abfd)->core->pid |
| 501 | = bfd_get_32 (abfd, note->descdata + 12); |
| 502 | elf_tdata (abfd)->core->program |
| 503 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); |
| 504 | elf_tdata (abfd)->core->command |
| 505 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | /* Note that for some reason, a spurious space is tacked |
| 510 | onto the end of the args in some (at least one anyway) |
| 511 | implementations, so strip it off if it exists. */ |
| 512 | { |
| 513 | char *command = elf_tdata (abfd)->core->command; |
| 514 | int n = strlen (command); |
| 515 | |
| 516 | if (0 < n && command[n - 1] == ' ') |
| 517 | command[n - 1] = '\0'; |
| 518 | } |
| 519 | |
| 520 | return TRUE; |
| 521 | } |
| 522 | \f |
| 523 | /* Functions for the i386 ELF linker. |
| 524 | |
| 525 | In order to gain some understanding of code in this file without |
| 526 | knowing all the intricate details of the linker, note the |
| 527 | following: |
| 528 | |
| 529 | Functions named elf_i386_* are called by external routines, other |
| 530 | functions are only called locally. elf_i386_* functions appear |
| 531 | in this file more or less in the order in which they are called |
| 532 | from external routines. eg. elf_i386_check_relocs is called |
| 533 | early in the link process, elf_i386_finish_dynamic_sections is |
| 534 | one of the last functions. */ |
| 535 | |
| 536 | /* The size in bytes of an entry in the lazy procedure linkage table. */ |
| 537 | |
| 538 | #define LAZY_PLT_ENTRY_SIZE 16 |
| 539 | |
| 540 | /* The size in bytes of an entry in the non-lazy procedure linkage |
| 541 | table. */ |
| 542 | |
| 543 | #define NON_LAZY_PLT_ENTRY_SIZE 8 |
| 544 | |
| 545 | /* The first entry in an absolute lazy procedure linkage table looks |
| 546 | like this. See the SVR4 ABI i386 supplement to see how this works. |
| 547 | Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */ |
| 548 | |
| 549 | static const bfd_byte elf_i386_lazy_plt0_entry[12] = |
| 550 | { |
| 551 | 0xff, 0x35, /* pushl contents of address */ |
| 552 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ |
| 553 | 0xff, 0x25, /* jmp indirect */ |
| 554 | 0, 0, 0, 0 /* replaced with address of .got + 8. */ |
| 555 | }; |
| 556 | |
| 557 | /* Subsequent entries in an absolute lazy procedure linkage table look |
| 558 | like this. */ |
| 559 | |
| 560 | static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 561 | { |
| 562 | 0xff, 0x25, /* jmp indirect */ |
| 563 | 0, 0, 0, 0, /* replaced with address of this symbol in .got. */ |
| 564 | 0x68, /* pushl immediate */ |
| 565 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 566 | 0xe9, /* jmp relative */ |
| 567 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 568 | }; |
| 569 | |
| 570 | /* The first entry in a PIC lazy procedure linkage table look like |
| 571 | this. Will be padded to LAZY_PLT_ENTRY_SIZE with |
| 572 | lazy_plt->plt0_pad_byte. */ |
| 573 | |
| 574 | static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] = |
| 575 | { |
| 576 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ |
| 577 | 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */ |
| 578 | }; |
| 579 | |
| 580 | /* Subsequent entries in a PIC lazy procedure linkage table look like |
| 581 | this. */ |
| 582 | |
| 583 | static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 584 | { |
| 585 | 0xff, 0xa3, /* jmp *offset(%ebx) */ |
| 586 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ |
| 587 | 0x68, /* pushl immediate */ |
| 588 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 589 | 0xe9, /* jmp relative */ |
| 590 | 0, 0, 0, 0 /* replaced with offset to start of .plt. */ |
| 591 | }; |
| 592 | |
| 593 | /* Entries in the non-lazy procedure linkage table look like this. */ |
| 594 | |
| 595 | static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = |
| 596 | { |
| 597 | 0xff, 0x25, /* jmp indirect */ |
| 598 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ |
| 599 | 0x66, 0x90 /* xchg %ax,%ax */ |
| 600 | }; |
| 601 | |
| 602 | /* Entries in the PIC non-lazy procedure linkage table look like |
| 603 | this. */ |
| 604 | |
| 605 | static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] = |
| 606 | { |
| 607 | 0xff, 0xa3, /* jmp *offset(%ebx) */ |
| 608 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ |
| 609 | 0x66, 0x90 /* xchg %ax,%ax */ |
| 610 | }; |
| 611 | |
| 612 | /* The first entry in an absolute IBT-enabled lazy procedure linkage |
| 613 | table looks like this. */ |
| 614 | |
| 615 | static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] = |
| 616 | { |
| 617 | 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */ |
| 618 | 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */ |
| 619 | 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ |
| 620 | }; |
| 621 | |
| 622 | /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage |
| 623 | table look like this. Subsequent entries for a PIC IBT-enabled lazy |
| 624 | procedure linkage table are the same. */ |
| 625 | |
| 626 | static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 627 | { |
| 628 | 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */ |
| 629 | 0x68, 0, 0, 0, 0, /* pushl immediate */ |
| 630 | 0xe9, 0, 0, 0, 0, /* jmp relative */ |
| 631 | 0x66, 0x90 /* xchg %ax,%ax */ |
| 632 | }; |
| 633 | |
| 634 | /* The first entry in a PIC IBT-enabled lazy procedure linkage table |
| 635 | look like. */ |
| 636 | |
| 637 | static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] = |
| 638 | { |
| 639 | 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */ |
| 640 | 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */ |
| 641 | 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ |
| 642 | }; |
| 643 | |
| 644 | /* Entries for branches with IBT-enabled in the absolute non-lazey |
| 645 | procedure linkage table look like this. They have the same size |
| 646 | as the lazy PLT entry. */ |
| 647 | |
| 648 | static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 649 | { |
| 650 | 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */ |
| 651 | 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */ |
| 652 | 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */ |
| 653 | }; |
| 654 | |
| 655 | /* Entries for branches with IBT-enabled in the PIC non-lazey procedure |
| 656 | linkage table look like this. They have the same size as the lazy |
| 657 | PLT entry. */ |
| 658 | |
| 659 | static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] = |
| 660 | { |
| 661 | 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */ |
| 662 | 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */ |
| 663 | 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */ |
| 664 | }; |
| 665 | |
| 666 | /* .eh_frame covering the lazy .plt section. */ |
| 667 | |
| 668 | static const bfd_byte elf_i386_eh_frame_lazy_plt[] = |
| 669 | { |
| 670 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 671 | 0, 0, 0, 0, /* CIE ID */ |
| 672 | 1, /* CIE version */ |
| 673 | 'z', 'R', 0, /* Augmentation string */ |
| 674 | 1, /* Code alignment factor */ |
| 675 | 0x7c, /* Data alignment factor */ |
| 676 | 8, /* Return address column */ |
| 677 | 1, /* Augmentation size */ |
| 678 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 679 | DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ |
| 680 | DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ |
| 681 | DW_CFA_nop, DW_CFA_nop, |
| 682 | |
| 683 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 684 | PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ |
| 685 | 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ |
| 686 | 0, 0, 0, 0, /* .plt size goes here */ |
| 687 | 0, /* Augmentation size */ |
| 688 | DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ |
| 689 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ |
| 690 | DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ |
| 691 | DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ |
| 692 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ |
| 693 | 11, /* Block length */ |
| 694 | DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ |
| 695 | DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ |
| 696 | DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, |
| 697 | DW_OP_lit2, DW_OP_shl, DW_OP_plus, |
| 698 | DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop |
| 699 | }; |
| 700 | |
| 701 | /* .eh_frame covering the lazy .plt section with IBT-enabled. */ |
| 702 | |
| 703 | static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] = |
| 704 | { |
| 705 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 706 | 0, 0, 0, 0, /* CIE ID */ |
| 707 | 1, /* CIE version */ |
| 708 | 'z', 'R', 0, /* Augmentation string */ |
| 709 | 1, /* Code alignment factor */ |
| 710 | 0x7c, /* Data alignment factor */ |
| 711 | 8, /* Return address column */ |
| 712 | 1, /* Augmentation size */ |
| 713 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 714 | DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ |
| 715 | DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ |
| 716 | DW_CFA_nop, DW_CFA_nop, |
| 717 | |
| 718 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 719 | PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ |
| 720 | 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ |
| 721 | 0, 0, 0, 0, /* .plt size goes here */ |
| 722 | 0, /* Augmentation size */ |
| 723 | DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ |
| 724 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ |
| 725 | DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ |
| 726 | DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ |
| 727 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ |
| 728 | 11, /* Block length */ |
| 729 | DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ |
| 730 | DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ |
| 731 | DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge, |
| 732 | DW_OP_lit2, DW_OP_shl, DW_OP_plus, |
| 733 | DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop |
| 734 | }; |
| 735 | |
| 736 | /* .eh_frame covering the non-lazy .plt section. */ |
| 737 | |
| 738 | static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] = |
| 739 | { |
| 740 | #define PLT_GOT_FDE_LENGTH 16 |
| 741 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 742 | 0, 0, 0, 0, /* CIE ID */ |
| 743 | 1, /* CIE version */ |
| 744 | 'z', 'R', 0, /* Augmentation string */ |
| 745 | 1, /* Code alignment factor */ |
| 746 | 0x7c, /* Data alignment factor */ |
| 747 | 8, /* Return address column */ |
| 748 | 1, /* Augmentation size */ |
| 749 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 750 | DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ |
| 751 | DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ |
| 752 | DW_CFA_nop, DW_CFA_nop, |
| 753 | |
| 754 | PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 755 | PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ |
| 756 | 0, 0, 0, 0, /* the start of non-lazy .plt goes here */ |
| 757 | 0, 0, 0, 0, /* non-lazy .plt size goes here */ |
| 758 | 0, /* Augmentation size */ |
| 759 | DW_CFA_nop, DW_CFA_nop, DW_CFA_nop |
| 760 | }; |
| 761 | |
| 762 | /* These are the standard parameters. */ |
| 763 | static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt = |
| 764 | { |
| 765 | elf_i386_lazy_plt0_entry, /* plt0_entry */ |
| 766 | sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */ |
| 767 | elf_i386_lazy_plt_entry, /* plt_entry */ |
| 768 | LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 769 | NULL, /* plt_tlsdesc_entry */ |
| 770 | 0, /* plt_tlsdesc_entry_size*/ |
| 771 | 0, /* plt_tlsdesc_got1_offset */ |
| 772 | 0, /* plt_tlsdesc_got2_offset */ |
| 773 | 0, /* plt_tlsdesc_got1_insn_end */ |
| 774 | 0, /* plt_tlsdesc_got2_insn_end */ |
| 775 | 2, /* plt0_got1_offset */ |
| 776 | 8, /* plt0_got2_offset */ |
| 777 | 0, /* plt0_got2_insn_end */ |
| 778 | 2, /* plt_got_offset */ |
| 779 | 7, /* plt_reloc_offset */ |
| 780 | 12, /* plt_plt_offset */ |
| 781 | 0, /* plt_got_insn_size */ |
| 782 | 0, /* plt_plt_insn_end */ |
| 783 | 6, /* plt_lazy_offset */ |
| 784 | elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */ |
| 785 | elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */ |
| 786 | elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */ |
| 787 | sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */ |
| 788 | }; |
| 789 | |
| 790 | static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt = |
| 791 | { |
| 792 | elf_i386_non_lazy_plt_entry, /* plt_entry */ |
| 793 | elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */ |
| 794 | NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 795 | 2, /* plt_got_offset */ |
| 796 | 0, /* plt_got_insn_size */ |
| 797 | elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */ |
| 798 | sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ |
| 799 | }; |
| 800 | |
| 801 | static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt = |
| 802 | { |
| 803 | elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */ |
| 804 | sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */ |
| 805 | elf_i386_lazy_ibt_plt_entry, /* plt_entry */ |
| 806 | LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 807 | NULL, /* plt_tlsdesc_entry */ |
| 808 | 0, /* plt_tlsdesc_entry_size*/ |
| 809 | 0, /* plt_tlsdesc_got1_offset */ |
| 810 | 0, /* plt_tlsdesc_got2_offset */ |
| 811 | 0, /* plt_tlsdesc_got1_insn_end */ |
| 812 | 0, /* plt_tlsdesc_got2_insn_end */ |
| 813 | 2, /* plt0_got1_offset */ |
| 814 | 8, /* plt0_got2_offset */ |
| 815 | 0, /* plt0_got2_insn_end */ |
| 816 | 4+2, /* plt_got_offset */ |
| 817 | 4+1, /* plt_reloc_offset */ |
| 818 | 4+6, /* plt_plt_offset */ |
| 819 | 0, /* plt_got_insn_size */ |
| 820 | 0, /* plt_plt_insn_end */ |
| 821 | 0, /* plt_lazy_offset */ |
| 822 | elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */ |
| 823 | elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */ |
| 824 | elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */ |
| 825 | sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */ |
| 826 | }; |
| 827 | |
| 828 | static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt = |
| 829 | { |
| 830 | elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */ |
| 831 | elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */ |
| 832 | LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 833 | 4+2, /* plt_got_offset */ |
| 834 | 0, /* plt_got_insn_size */ |
| 835 | elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */ |
| 836 | sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */ |
| 837 | }; |
| 838 | \f |
| 839 | |
| 840 | /* On VxWorks, the .rel.plt.unloaded section has absolute relocations |
| 841 | for the PLTResolve stub and then for each PLT entry. */ |
| 842 | #define PLTRESOLVE_RELOCS_SHLIB 0 |
| 843 | #define PLTRESOLVE_RELOCS 2 |
| 844 | #define PLT_NON_JUMP_SLOT_RELOCS 2 |
| 845 | |
| 846 | /* These are the standard parameters. */ |
| 847 | static const struct elf_x86_backend_data elf_i386_arch_bed = |
| 848 | { |
| 849 | is_normal /* os */ |
| 850 | }; |
| 851 | |
| 852 | #define elf_backend_arch_data &elf_i386_arch_bed |
| 853 | |
| 854 | /* Return TRUE if the TLS access code sequence support transition |
| 855 | from R_TYPE. */ |
| 856 | |
| 857 | static bfd_boolean |
| 858 | elf_i386_check_tls_transition (asection *sec, |
| 859 | bfd_byte *contents, |
| 860 | Elf_Internal_Shdr *symtab_hdr, |
| 861 | struct elf_link_hash_entry **sym_hashes, |
| 862 | unsigned int r_type, |
| 863 | const Elf_Internal_Rela *rel, |
| 864 | const Elf_Internal_Rela *relend) |
| 865 | { |
| 866 | unsigned int val, type, reg; |
| 867 | unsigned long r_symndx; |
| 868 | struct elf_link_hash_entry *h; |
| 869 | bfd_vma offset; |
| 870 | bfd_byte *call; |
| 871 | bfd_boolean indirect_call; |
| 872 | |
| 873 | offset = rel->r_offset; |
| 874 | switch (r_type) |
| 875 | { |
| 876 | case R_386_TLS_GD: |
| 877 | case R_386_TLS_LDM: |
| 878 | if (offset < 2 || (rel + 1) >= relend) |
| 879 | return FALSE; |
| 880 | |
| 881 | indirect_call = FALSE; |
| 882 | call = contents + offset + 4; |
| 883 | val = *(call - 5); |
| 884 | type = *(call - 6); |
| 885 | if (r_type == R_386_TLS_GD) |
| 886 | { |
| 887 | /* Check transition from GD access model. Only |
| 888 | leal foo@tlsgd(,%ebx,1), %eax |
| 889 | call ___tls_get_addr@PLT |
| 890 | or |
| 891 | leal foo@tlsgd(%ebx) %eax |
| 892 | call ___tls_get_addr@PLT |
| 893 | nop |
| 894 | or |
| 895 | leal foo@tlsgd(%reg), %eax |
| 896 | call *___tls_get_addr@GOT(%reg) |
| 897 | which may be converted to |
| 898 | addr32 call ___tls_get_addr |
| 899 | can transit to different access model. */ |
| 900 | if ((offset + 10) > sec->size |
| 901 | || (type != 0x8d && type != 0x04)) |
| 902 | return FALSE; |
| 903 | |
| 904 | if (type == 0x04) |
| 905 | { |
| 906 | /* leal foo@tlsgd(,%ebx,1), %eax |
| 907 | call ___tls_get_addr@PLT */ |
| 908 | if (offset < 3) |
| 909 | return FALSE; |
| 910 | |
| 911 | if (*(call - 7) != 0x8d |
| 912 | || val != 0x1d |
| 913 | || call[0] != 0xe8) |
| 914 | return FALSE; |
| 915 | } |
| 916 | else |
| 917 | { |
| 918 | /* This must be |
| 919 | leal foo@tlsgd(%ebx), %eax |
| 920 | call ___tls_get_addr@PLT |
| 921 | nop |
| 922 | or |
| 923 | leal foo@tlsgd(%reg), %eax |
| 924 | call *___tls_get_addr@GOT(%reg) |
| 925 | which may be converted to |
| 926 | addr32 call ___tls_get_addr |
| 927 | |
| 928 | %eax can't be used as the GOT base register since it |
| 929 | is used to pass parameter to ___tls_get_addr. */ |
| 930 | reg = val & 7; |
| 931 | if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0) |
| 932 | return FALSE; |
| 933 | |
| 934 | indirect_call = call[0] == 0xff; |
| 935 | if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90) |
| 936 | && !(call[0] == 0x67 && call[1] == 0xe8) |
| 937 | && !(indirect_call |
| 938 | && (call[1] & 0xf8) == 0x90 |
| 939 | && (call[1] & 0x7) == reg)) |
| 940 | return FALSE; |
| 941 | } |
| 942 | } |
| 943 | else |
| 944 | { |
| 945 | /* Check transition from LD access model. Only |
| 946 | leal foo@tlsldm(%ebx), %eax |
| 947 | call ___tls_get_addr@PLT |
| 948 | or |
| 949 | leal foo@tlsldm(%reg), %eax |
| 950 | call *___tls_get_addr@GOT(%reg) |
| 951 | which may be converted to |
| 952 | addr32 call ___tls_get_addr |
| 953 | can transit to different access model. */ |
| 954 | if (type != 0x8d || (offset + 9) > sec->size) |
| 955 | return FALSE; |
| 956 | |
| 957 | /* %eax can't be used as the GOT base register since it is |
| 958 | used to pass parameter to ___tls_get_addr. */ |
| 959 | reg = val & 7; |
| 960 | if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0) |
| 961 | return FALSE; |
| 962 | |
| 963 | indirect_call = call[0] == 0xff; |
| 964 | if (!(reg == 3 && call[0] == 0xe8) |
| 965 | && !(call[0] == 0x67 && call[1] == 0xe8) |
| 966 | && !(indirect_call |
| 967 | && (call[1] & 0xf8) == 0x90 |
| 968 | && (call[1] & 0x7) == reg)) |
| 969 | return FALSE; |
| 970 | } |
| 971 | |
| 972 | r_symndx = ELF32_R_SYM (rel[1].r_info); |
| 973 | if (r_symndx < symtab_hdr->sh_info) |
| 974 | return FALSE; |
| 975 | |
| 976 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 977 | if (h == NULL |
| 978 | || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr) |
| 979 | return FALSE; |
| 980 | else if (indirect_call) |
| 981 | return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X); |
| 982 | else |
| 983 | return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32 |
| 984 | || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32); |
| 985 | |
| 986 | case R_386_TLS_IE: |
| 987 | /* Check transition from IE access model: |
| 988 | movl foo@indntpoff(%rip), %eax |
| 989 | movl foo@indntpoff(%rip), %reg |
| 990 | addl foo@indntpoff(%rip), %reg |
| 991 | */ |
| 992 | |
| 993 | if (offset < 1 || (offset + 4) > sec->size) |
| 994 | return FALSE; |
| 995 | |
| 996 | /* Check "movl foo@tpoff(%rip), %eax" first. */ |
| 997 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 998 | if (val == 0xa1) |
| 999 | return TRUE; |
| 1000 | |
| 1001 | if (offset < 2) |
| 1002 | return FALSE; |
| 1003 | |
| 1004 | /* Check movl|addl foo@tpoff(%rip), %reg. */ |
| 1005 | type = bfd_get_8 (abfd, contents + offset - 2); |
| 1006 | return ((type == 0x8b || type == 0x03) |
| 1007 | && (val & 0xc7) == 0x05); |
| 1008 | |
| 1009 | case R_386_TLS_GOTIE: |
| 1010 | case R_386_TLS_IE_32: |
| 1011 | /* Check transition from {IE_32,GOTIE} access model: |
| 1012 | subl foo@{tpoff,gontoff}(%reg1), %reg2 |
| 1013 | movl foo@{tpoff,gontoff}(%reg1), %reg2 |
| 1014 | addl foo@{tpoff,gontoff}(%reg1), %reg2 |
| 1015 | */ |
| 1016 | |
| 1017 | if (offset < 2 || (offset + 4) > sec->size) |
| 1018 | return FALSE; |
| 1019 | |
| 1020 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1021 | if ((val & 0xc0) != 0x80 || (val & 7) == 4) |
| 1022 | return FALSE; |
| 1023 | |
| 1024 | type = bfd_get_8 (abfd, contents + offset - 2); |
| 1025 | return type == 0x8b || type == 0x2b || type == 0x03; |
| 1026 | |
| 1027 | case R_386_TLS_GOTDESC: |
| 1028 | /* Check transition from GDesc access model: |
| 1029 | leal x@tlsdesc(%ebx), %eax |
| 1030 | |
| 1031 | Make sure it's a leal adding ebx to a 32-bit offset |
| 1032 | into any register, although it's probably almost always |
| 1033 | going to be eax. */ |
| 1034 | |
| 1035 | if (offset < 2 || (offset + 4) > sec->size) |
| 1036 | return FALSE; |
| 1037 | |
| 1038 | if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) |
| 1039 | return FALSE; |
| 1040 | |
| 1041 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1042 | return (val & 0xc7) == 0x83; |
| 1043 | |
| 1044 | case R_386_TLS_DESC_CALL: |
| 1045 | /* Check transition from GDesc access model: |
| 1046 | call *x@tlsdesc(%eax) |
| 1047 | */ |
| 1048 | if (offset + 2 <= sec->size) |
| 1049 | { |
| 1050 | /* Make sure that it's a call *x@tlsdesc(%eax). */ |
| 1051 | call = contents + offset; |
| 1052 | return call[0] == 0xff && call[1] == 0x10; |
| 1053 | } |
| 1054 | |
| 1055 | return FALSE; |
| 1056 | |
| 1057 | default: |
| 1058 | abort (); |
| 1059 | } |
| 1060 | } |
| 1061 | |
| 1062 | /* Return TRUE if the TLS access transition is OK or no transition |
| 1063 | will be performed. Update R_TYPE if there is a transition. */ |
| 1064 | |
| 1065 | static bfd_boolean |
| 1066 | elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd, |
| 1067 | asection *sec, bfd_byte *contents, |
| 1068 | Elf_Internal_Shdr *symtab_hdr, |
| 1069 | struct elf_link_hash_entry **sym_hashes, |
| 1070 | unsigned int *r_type, int tls_type, |
| 1071 | const Elf_Internal_Rela *rel, |
| 1072 | const Elf_Internal_Rela *relend, |
| 1073 | struct elf_link_hash_entry *h, |
| 1074 | unsigned long r_symndx, |
| 1075 | bfd_boolean from_relocate_section) |
| 1076 | { |
| 1077 | unsigned int from_type = *r_type; |
| 1078 | unsigned int to_type = from_type; |
| 1079 | bfd_boolean check = TRUE; |
| 1080 | |
| 1081 | /* Skip TLS transition for functions. */ |
| 1082 | if (h != NULL |
| 1083 | && (h->type == STT_FUNC |
| 1084 | || h->type == STT_GNU_IFUNC)) |
| 1085 | return TRUE; |
| 1086 | |
| 1087 | switch (from_type) |
| 1088 | { |
| 1089 | case R_386_TLS_GD: |
| 1090 | case R_386_TLS_GOTDESC: |
| 1091 | case R_386_TLS_DESC_CALL: |
| 1092 | case R_386_TLS_IE_32: |
| 1093 | case R_386_TLS_IE: |
| 1094 | case R_386_TLS_GOTIE: |
| 1095 | if (bfd_link_executable (info)) |
| 1096 | { |
| 1097 | if (h == NULL) |
| 1098 | to_type = R_386_TLS_LE_32; |
| 1099 | else if (from_type != R_386_TLS_IE |
| 1100 | && from_type != R_386_TLS_GOTIE) |
| 1101 | to_type = R_386_TLS_IE_32; |
| 1102 | } |
| 1103 | |
| 1104 | /* When we are called from elf_i386_relocate_section, there may |
| 1105 | be additional transitions based on TLS_TYPE. */ |
| 1106 | if (from_relocate_section) |
| 1107 | { |
| 1108 | unsigned int new_to_type = to_type; |
| 1109 | |
| 1110 | if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type)) |
| 1111 | new_to_type = R_386_TLS_LE_32; |
| 1112 | |
| 1113 | if (to_type == R_386_TLS_GD |
| 1114 | || to_type == R_386_TLS_GOTDESC |
| 1115 | || to_type == R_386_TLS_DESC_CALL) |
| 1116 | { |
| 1117 | if (tls_type == GOT_TLS_IE_POS) |
| 1118 | new_to_type = R_386_TLS_GOTIE; |
| 1119 | else if (tls_type & GOT_TLS_IE) |
| 1120 | new_to_type = R_386_TLS_IE_32; |
| 1121 | } |
| 1122 | |
| 1123 | /* We checked the transition before when we were called from |
| 1124 | elf_i386_check_relocs. We only want to check the new |
| 1125 | transition which hasn't been checked before. */ |
| 1126 | check = new_to_type != to_type && from_type == to_type; |
| 1127 | to_type = new_to_type; |
| 1128 | } |
| 1129 | |
| 1130 | break; |
| 1131 | |
| 1132 | case R_386_TLS_LDM: |
| 1133 | if (bfd_link_executable (info)) |
| 1134 | to_type = R_386_TLS_LE_32; |
| 1135 | break; |
| 1136 | |
| 1137 | default: |
| 1138 | return TRUE; |
| 1139 | } |
| 1140 | |
| 1141 | /* Return TRUE if there is no transition. */ |
| 1142 | if (from_type == to_type) |
| 1143 | return TRUE; |
| 1144 | |
| 1145 | /* Check if the transition can be performed. */ |
| 1146 | if (check |
| 1147 | && ! elf_i386_check_tls_transition (sec, contents, |
| 1148 | symtab_hdr, sym_hashes, |
| 1149 | from_type, rel, relend)) |
| 1150 | { |
| 1151 | reloc_howto_type *from, *to; |
| 1152 | const char *name; |
| 1153 | |
| 1154 | from = elf_i386_rtype_to_howto (from_type); |
| 1155 | to = elf_i386_rtype_to_howto (to_type); |
| 1156 | |
| 1157 | if (h) |
| 1158 | name = h->root.root.string; |
| 1159 | else |
| 1160 | { |
| 1161 | struct elf_x86_link_hash_table *htab; |
| 1162 | |
| 1163 | htab = elf_x86_hash_table (info, I386_ELF_DATA); |
| 1164 | if (htab == NULL) |
| 1165 | name = "*unknown*"; |
| 1166 | else |
| 1167 | { |
| 1168 | Elf_Internal_Sym *isym; |
| 1169 | |
| 1170 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1171 | abfd, r_symndx); |
| 1172 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); |
| 1173 | } |
| 1174 | } |
| 1175 | |
| 1176 | _bfd_error_handler |
| 1177 | /* xgettext:c-format */ |
| 1178 | (_("%pB: TLS transition from %s to %s against `%s'" |
| 1179 | " at %#" PRIx64 " in section `%pA' failed"), |
| 1180 | abfd, from->name, to->name, name, |
| 1181 | (uint64_t) rel->r_offset, sec); |
| 1182 | bfd_set_error (bfd_error_bad_value); |
| 1183 | return FALSE; |
| 1184 | } |
| 1185 | |
| 1186 | *r_type = to_type; |
| 1187 | return TRUE; |
| 1188 | } |
| 1189 | |
| 1190 | /* With the local symbol, foo, we convert |
| 1191 | mov foo@GOT[(%reg1)], %reg2 |
| 1192 | to |
| 1193 | lea foo[@GOTOFF(%reg1)], %reg2 |
| 1194 | and convert |
| 1195 | call/jmp *foo@GOT[(%reg)] |
| 1196 | to |
| 1197 | nop call foo/jmp foo nop |
| 1198 | When PIC is false, convert |
| 1199 | test %reg1, foo@GOT[(%reg2)] |
| 1200 | to |
| 1201 | test $foo, %reg1 |
| 1202 | and convert |
| 1203 | binop foo@GOT[(%reg1)], %reg2 |
| 1204 | to |
| 1205 | binop $foo, %reg2 |
| 1206 | where binop is one of adc, add, and, cmp, or, sbb, sub, xor |
| 1207 | instructions. */ |
| 1208 | |
| 1209 | static |
| 1210 | bfd_boolean |
| 1211 | elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr, |
| 1212 | bfd_byte *contents, |
| 1213 | unsigned int *r_type_p, |
| 1214 | Elf_Internal_Rela *irel, |
| 1215 | struct elf_link_hash_entry *h, |
| 1216 | bfd_boolean *converted, |
| 1217 | struct bfd_link_info *link_info) |
| 1218 | { |
| 1219 | struct elf_x86_link_hash_table *htab; |
| 1220 | unsigned int opcode; |
| 1221 | unsigned int modrm; |
| 1222 | bfd_boolean baseless; |
| 1223 | Elf_Internal_Sym *isym; |
| 1224 | unsigned int addend; |
| 1225 | unsigned int nop; |
| 1226 | bfd_vma nop_offset; |
| 1227 | bfd_boolean is_pic; |
| 1228 | bfd_boolean to_reloc_32; |
| 1229 | unsigned int r_type; |
| 1230 | unsigned int r_symndx; |
| 1231 | bfd_vma roff = irel->r_offset; |
| 1232 | bfd_boolean local_ref; |
| 1233 | struct elf_x86_link_hash_entry *eh; |
| 1234 | |
| 1235 | if (roff < 2) |
| 1236 | return TRUE; |
| 1237 | |
| 1238 | /* Addend for R_386_GOT32X relocations must be 0. */ |
| 1239 | addend = bfd_get_32 (abfd, contents + roff); |
| 1240 | if (addend != 0) |
| 1241 | return TRUE; |
| 1242 | |
| 1243 | htab = elf_x86_hash_table (link_info, I386_ELF_DATA); |
| 1244 | is_pic = bfd_link_pic (link_info); |
| 1245 | |
| 1246 | r_type = *r_type_p; |
| 1247 | r_symndx = ELF32_R_SYM (irel->r_info); |
| 1248 | |
| 1249 | modrm = bfd_get_8 (abfd, contents + roff - 1); |
| 1250 | baseless = (modrm & 0xc7) == 0x5; |
| 1251 | |
| 1252 | if (baseless && is_pic) |
| 1253 | { |
| 1254 | /* For PIC, disallow R_386_GOT32X without a base register |
| 1255 | since we don't know what the GOT base is. */ |
| 1256 | const char *name; |
| 1257 | |
| 1258 | if (h == NULL) |
| 1259 | { |
| 1260 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, |
| 1261 | r_symndx); |
| 1262 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); |
| 1263 | } |
| 1264 | else |
| 1265 | name = h->root.root.string; |
| 1266 | |
| 1267 | _bfd_error_handler |
| 1268 | /* xgettext:c-format */ |
| 1269 | (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base" |
| 1270 | " register can not be used when making a shared object"), |
| 1271 | abfd, name); |
| 1272 | return FALSE; |
| 1273 | } |
| 1274 | |
| 1275 | opcode = bfd_get_8 (abfd, contents + roff - 2); |
| 1276 | |
| 1277 | /* Convert to R_386_32 if PIC is false or there is no base |
| 1278 | register. */ |
| 1279 | to_reloc_32 = !is_pic || baseless; |
| 1280 | |
| 1281 | eh = elf_x86_hash_entry (h); |
| 1282 | |
| 1283 | /* Try to convert R_386_GOT32X. Get the symbol referred to by the |
| 1284 | reloc. */ |
| 1285 | if (h == NULL) |
| 1286 | { |
| 1287 | if (opcode == 0x0ff) |
| 1288 | /* Convert "call/jmp *foo@GOT[(%reg)]". */ |
| 1289 | goto convert_branch; |
| 1290 | else |
| 1291 | /* Convert "mov foo@GOT[(%reg1)], %reg2", |
| 1292 | "test %reg1, foo@GOT(%reg2)" and |
| 1293 | "binop foo@GOT[(%reg1)], %reg2". */ |
| 1294 | goto convert_load; |
| 1295 | } |
| 1296 | |
| 1297 | /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */ |
| 1298 | local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h); |
| 1299 | |
| 1300 | /* Undefined weak symbol is only bound locally in executable |
| 1301 | and its reference is resolved as 0. */ |
| 1302 | if (h->root.type == bfd_link_hash_undefweak |
| 1303 | && !eh->linker_def |
| 1304 | && local_ref) |
| 1305 | { |
| 1306 | if (opcode == 0xff) |
| 1307 | { |
| 1308 | /* No direct branch to 0 for PIC. */ |
| 1309 | if (is_pic) |
| 1310 | return TRUE; |
| 1311 | else |
| 1312 | goto convert_branch; |
| 1313 | } |
| 1314 | else |
| 1315 | { |
| 1316 | /* We can convert load of address 0 to R_386_32. */ |
| 1317 | to_reloc_32 = TRUE; |
| 1318 | goto convert_load; |
| 1319 | } |
| 1320 | } |
| 1321 | |
| 1322 | if (opcode == 0xff) |
| 1323 | { |
| 1324 | /* We have "call/jmp *foo@GOT[(%reg)]". */ |
| 1325 | if ((h->root.type == bfd_link_hash_defined |
| 1326 | || h->root.type == bfd_link_hash_defweak) |
| 1327 | && local_ref) |
| 1328 | { |
| 1329 | /* The function is locally defined. */ |
| 1330 | convert_branch: |
| 1331 | /* Convert R_386_GOT32X to R_386_PC32. */ |
| 1332 | if (modrm == 0x15 || (modrm & 0xf8) == 0x90) |
| 1333 | { |
| 1334 | /* Convert to "nop call foo". ADDR_PREFIX_OPCODE |
| 1335 | is a nop prefix. */ |
| 1336 | modrm = 0xe8; |
| 1337 | /* To support TLS optimization, always use addr32 prefix |
| 1338 | for "call *___tls_get_addr@GOT(%reg)". */ |
| 1339 | if (eh && eh->tls_get_addr) |
| 1340 | { |
| 1341 | nop = 0x67; |
| 1342 | nop_offset = irel->r_offset - 2; |
| 1343 | } |
| 1344 | else |
| 1345 | { |
| 1346 | nop = htab->params->call_nop_byte; |
| 1347 | if (htab->params->call_nop_as_suffix) |
| 1348 | { |
| 1349 | nop_offset = roff + 3; |
| 1350 | irel->r_offset -= 1; |
| 1351 | } |
| 1352 | else |
| 1353 | nop_offset = roff - 2; |
| 1354 | } |
| 1355 | } |
| 1356 | else |
| 1357 | { |
| 1358 | /* Convert to "jmp foo nop". */ |
| 1359 | modrm = 0xe9; |
| 1360 | nop = NOP_OPCODE; |
| 1361 | nop_offset = roff + 3; |
| 1362 | irel->r_offset -= 1; |
| 1363 | } |
| 1364 | |
| 1365 | bfd_put_8 (abfd, nop, contents + nop_offset); |
| 1366 | bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1); |
| 1367 | /* When converting to PC-relative relocation, we |
| 1368 | need to adjust addend by -4. */ |
| 1369 | bfd_put_32 (abfd, -4, contents + irel->r_offset); |
| 1370 | irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32); |
| 1371 | *r_type_p = R_386_PC32; |
| 1372 | *converted = TRUE; |
| 1373 | } |
| 1374 | } |
| 1375 | else |
| 1376 | { |
| 1377 | /* We have "mov foo@GOT[(%re1g)], %reg2", |
| 1378 | "test %reg1, foo@GOT(%reg2)" and |
| 1379 | "binop foo@GOT[(%reg1)], %reg2". |
| 1380 | |
| 1381 | Avoid optimizing _DYNAMIC since ld.so may use its |
| 1382 | link-time address. */ |
| 1383 | if (h == htab->elf.hdynamic) |
| 1384 | return TRUE; |
| 1385 | |
| 1386 | /* def_regular is set by an assignment in a linker script in |
| 1387 | bfd_elf_record_link_assignment. start_stop is set on |
| 1388 | __start_SECNAME/__stop_SECNAME which mark section SECNAME. */ |
| 1389 | if (h->start_stop |
| 1390 | || eh->linker_def |
| 1391 | || ((h->def_regular |
| 1392 | || h->root.type == bfd_link_hash_defined |
| 1393 | || h->root.type == bfd_link_hash_defweak) |
| 1394 | && local_ref)) |
| 1395 | { |
| 1396 | convert_load: |
| 1397 | if (opcode == 0x8b) |
| 1398 | { |
| 1399 | if (to_reloc_32) |
| 1400 | { |
| 1401 | /* Convert "mov foo@GOT[(%reg1)], %reg2" to |
| 1402 | "mov $foo, %reg2" with R_386_32. */ |
| 1403 | r_type = R_386_32; |
| 1404 | modrm = 0xc0 | (modrm & 0x38) >> 3; |
| 1405 | bfd_put_8 (abfd, modrm, contents + roff - 1); |
| 1406 | opcode = 0xc7; |
| 1407 | } |
| 1408 | else |
| 1409 | { |
| 1410 | /* Convert "mov foo@GOT(%reg1), %reg2" to |
| 1411 | "lea foo@GOTOFF(%reg1), %reg2". */ |
| 1412 | r_type = R_386_GOTOFF; |
| 1413 | opcode = 0x8d; |
| 1414 | } |
| 1415 | } |
| 1416 | else |
| 1417 | { |
| 1418 | /* Only R_386_32 is supported. */ |
| 1419 | if (!to_reloc_32) |
| 1420 | return TRUE; |
| 1421 | |
| 1422 | if (opcode == 0x85) |
| 1423 | { |
| 1424 | /* Convert "test %reg1, foo@GOT(%reg2)" to |
| 1425 | "test $foo, %reg1". */ |
| 1426 | modrm = 0xc0 | (modrm & 0x38) >> 3; |
| 1427 | opcode = 0xf7; |
| 1428 | } |
| 1429 | else |
| 1430 | { |
| 1431 | /* Convert "binop foo@GOT(%reg1), %reg2" to |
| 1432 | "binop $foo, %reg2". */ |
| 1433 | modrm = (0xc0 |
| 1434 | | (modrm & 0x38) >> 3 |
| 1435 | | (opcode & 0x3c)); |
| 1436 | opcode = 0x81; |
| 1437 | } |
| 1438 | bfd_put_8 (abfd, modrm, contents + roff - 1); |
| 1439 | r_type = R_386_32; |
| 1440 | } |
| 1441 | |
| 1442 | bfd_put_8 (abfd, opcode, contents + roff - 2); |
| 1443 | irel->r_info = ELF32_R_INFO (r_symndx, r_type); |
| 1444 | *r_type_p = r_type; |
| 1445 | *converted = TRUE; |
| 1446 | } |
| 1447 | } |
| 1448 | |
| 1449 | return TRUE; |
| 1450 | } |
| 1451 | |
| 1452 | /* Rename some of the generic section flags to better document how they |
| 1453 | are used here. */ |
| 1454 | #define check_relocs_failed sec_flg0 |
| 1455 | |
| 1456 | /* Look through the relocs for a section during the first phase, and |
| 1457 | calculate needed space in the global offset table, procedure linkage |
| 1458 | table, and dynamic reloc sections. */ |
| 1459 | |
| 1460 | static bfd_boolean |
| 1461 | elf_i386_check_relocs (bfd *abfd, |
| 1462 | struct bfd_link_info *info, |
| 1463 | asection *sec, |
| 1464 | const Elf_Internal_Rela *relocs) |
| 1465 | { |
| 1466 | struct elf_x86_link_hash_table *htab; |
| 1467 | Elf_Internal_Shdr *symtab_hdr; |
| 1468 | struct elf_link_hash_entry **sym_hashes; |
| 1469 | const Elf_Internal_Rela *rel; |
| 1470 | const Elf_Internal_Rela *rel_end; |
| 1471 | asection *sreloc; |
| 1472 | bfd_byte *contents; |
| 1473 | bfd_boolean converted; |
| 1474 | |
| 1475 | if (bfd_link_relocatable (info)) |
| 1476 | return TRUE; |
| 1477 | |
| 1478 | /* Don't do anything special with non-loaded, non-alloced sections. |
| 1479 | In particular, any relocs in such sections should not affect GOT |
| 1480 | and PLT reference counting (ie. we don't allow them to create GOT |
| 1481 | or PLT entries), there's no possibility or desire to optimize TLS |
| 1482 | relocs, and there's not much point in propagating relocs to shared |
| 1483 | libs that the dynamic linker won't relocate. */ |
| 1484 | if ((sec->flags & SEC_ALLOC) == 0) |
| 1485 | return TRUE; |
| 1486 | |
| 1487 | htab = elf_x86_hash_table (info, I386_ELF_DATA); |
| 1488 | if (htab == NULL) |
| 1489 | { |
| 1490 | sec->check_relocs_failed = 1; |
| 1491 | return FALSE; |
| 1492 | } |
| 1493 | |
| 1494 | BFD_ASSERT (is_x86_elf (abfd, htab)); |
| 1495 | |
| 1496 | /* Get the section contents. */ |
| 1497 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 1498 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1499 | else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 1500 | { |
| 1501 | sec->check_relocs_failed = 1; |
| 1502 | return FALSE; |
| 1503 | } |
| 1504 | |
| 1505 | symtab_hdr = &elf_symtab_hdr (abfd); |
| 1506 | sym_hashes = elf_sym_hashes (abfd); |
| 1507 | |
| 1508 | converted = FALSE; |
| 1509 | |
| 1510 | sreloc = NULL; |
| 1511 | |
| 1512 | rel_end = relocs + sec->reloc_count; |
| 1513 | for (rel = relocs; rel < rel_end; rel++) |
| 1514 | { |
| 1515 | unsigned int r_type; |
| 1516 | unsigned int r_symndx; |
| 1517 | struct elf_link_hash_entry *h; |
| 1518 | struct elf_x86_link_hash_entry *eh; |
| 1519 | Elf_Internal_Sym *isym; |
| 1520 | const char *name; |
| 1521 | bfd_boolean size_reloc; |
| 1522 | |
| 1523 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 1524 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1525 | |
| 1526 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 1527 | { |
| 1528 | /* xgettext:c-format */ |
| 1529 | _bfd_error_handler (_("%pB: bad symbol index: %d"), |
| 1530 | abfd, r_symndx); |
| 1531 | goto error_return; |
| 1532 | } |
| 1533 | |
| 1534 | if (r_symndx < symtab_hdr->sh_info) |
| 1535 | { |
| 1536 | /* A local symbol. */ |
| 1537 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1538 | abfd, r_symndx); |
| 1539 | if (isym == NULL) |
| 1540 | goto error_return; |
| 1541 | |
| 1542 | /* Check relocation against local STT_GNU_IFUNC symbol. */ |
| 1543 | if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) |
| 1544 | { |
| 1545 | h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE); |
| 1546 | if (h == NULL) |
| 1547 | goto error_return; |
| 1548 | |
| 1549 | /* Fake a STT_GNU_IFUNC symbol. */ |
| 1550 | h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr, |
| 1551 | isym, NULL); |
| 1552 | h->type = STT_GNU_IFUNC; |
| 1553 | h->def_regular = 1; |
| 1554 | h->ref_regular = 1; |
| 1555 | h->forced_local = 1; |
| 1556 | h->root.type = bfd_link_hash_defined; |
| 1557 | } |
| 1558 | else |
| 1559 | h = NULL; |
| 1560 | } |
| 1561 | else |
| 1562 | { |
| 1563 | isym = NULL; |
| 1564 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1565 | while (h->root.type == bfd_link_hash_indirect |
| 1566 | || h->root.type == bfd_link_hash_warning) |
| 1567 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1568 | } |
| 1569 | |
| 1570 | eh = (struct elf_x86_link_hash_entry *) h; |
| 1571 | if (h != NULL) |
| 1572 | { |
| 1573 | if (r_type == R_386_GOTOFF) |
| 1574 | eh->gotoff_ref = 1; |
| 1575 | |
| 1576 | /* It is referenced by a non-shared object. */ |
| 1577 | h->ref_regular = 1; |
| 1578 | } |
| 1579 | |
| 1580 | if (r_type == R_386_GOT32X |
| 1581 | && (h == NULL || h->type != STT_GNU_IFUNC)) |
| 1582 | { |
| 1583 | Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel; |
| 1584 | if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents, |
| 1585 | &r_type, irel, h, |
| 1586 | &converted, info)) |
| 1587 | goto error_return; |
| 1588 | } |
| 1589 | |
| 1590 | if (! elf_i386_tls_transition (info, abfd, sec, contents, |
| 1591 | symtab_hdr, sym_hashes, |
| 1592 | &r_type, GOT_UNKNOWN, |
| 1593 | rel, rel_end, h, r_symndx, FALSE)) |
| 1594 | goto error_return; |
| 1595 | |
| 1596 | /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */ |
| 1597 | if (h == htab->elf.hgot) |
| 1598 | htab->got_referenced = TRUE; |
| 1599 | |
| 1600 | switch (r_type) |
| 1601 | { |
| 1602 | case R_386_TLS_LDM: |
| 1603 | htab->tls_ld_or_ldm_got.refcount = 1; |
| 1604 | goto create_got; |
| 1605 | |
| 1606 | case R_386_PLT32: |
| 1607 | /* This symbol requires a procedure linkage table entry. We |
| 1608 | actually build the entry in adjust_dynamic_symbol, |
| 1609 | because this might be a case of linking PIC code which is |
| 1610 | never referenced by a dynamic object, in which case we |
| 1611 | don't need to generate a procedure linkage table entry |
| 1612 | after all. */ |
| 1613 | |
| 1614 | /* If this is a local symbol, we resolve it directly without |
| 1615 | creating a procedure linkage table entry. */ |
| 1616 | if (h == NULL) |
| 1617 | continue; |
| 1618 | |
| 1619 | eh->zero_undefweak &= 0x2; |
| 1620 | h->needs_plt = 1; |
| 1621 | h->plt.refcount = 1; |
| 1622 | break; |
| 1623 | |
| 1624 | case R_386_SIZE32: |
| 1625 | size_reloc = TRUE; |
| 1626 | goto do_size; |
| 1627 | |
| 1628 | case R_386_TLS_IE_32: |
| 1629 | case R_386_TLS_IE: |
| 1630 | case R_386_TLS_GOTIE: |
| 1631 | if (!bfd_link_executable (info)) |
| 1632 | info->flags |= DF_STATIC_TLS; |
| 1633 | /* Fall through */ |
| 1634 | |
| 1635 | case R_386_GOT32: |
| 1636 | case R_386_GOT32X: |
| 1637 | case R_386_TLS_GD: |
| 1638 | case R_386_TLS_GOTDESC: |
| 1639 | case R_386_TLS_DESC_CALL: |
| 1640 | /* This symbol requires a global offset table entry. */ |
| 1641 | { |
| 1642 | int tls_type, old_tls_type; |
| 1643 | |
| 1644 | switch (r_type) |
| 1645 | { |
| 1646 | default: |
| 1647 | case R_386_GOT32: |
| 1648 | case R_386_GOT32X: |
| 1649 | tls_type = GOT_NORMAL; |
| 1650 | break; |
| 1651 | case R_386_TLS_GD: tls_type = GOT_TLS_GD; break; |
| 1652 | case R_386_TLS_GOTDESC: |
| 1653 | case R_386_TLS_DESC_CALL: |
| 1654 | tls_type = GOT_TLS_GDESC; break; |
| 1655 | case R_386_TLS_IE_32: |
| 1656 | if (ELF32_R_TYPE (rel->r_info) == r_type) |
| 1657 | tls_type = GOT_TLS_IE_NEG; |
| 1658 | else |
| 1659 | /* If this is a GD->IE transition, we may use either of |
| 1660 | R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ |
| 1661 | tls_type = GOT_TLS_IE; |
| 1662 | break; |
| 1663 | case R_386_TLS_IE: |
| 1664 | case R_386_TLS_GOTIE: |
| 1665 | tls_type = GOT_TLS_IE_POS; break; |
| 1666 | } |
| 1667 | |
| 1668 | if (h != NULL) |
| 1669 | { |
| 1670 | h->got.refcount = 1; |
| 1671 | old_tls_type = elf_x86_hash_entry (h)->tls_type; |
| 1672 | } |
| 1673 | else |
| 1674 | { |
| 1675 | bfd_signed_vma *local_got_refcounts; |
| 1676 | |
| 1677 | /* This is a global offset table entry for a local symbol. */ |
| 1678 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1679 | if (local_got_refcounts == NULL) |
| 1680 | { |
| 1681 | bfd_size_type size; |
| 1682 | |
| 1683 | size = symtab_hdr->sh_info; |
| 1684 | size *= (sizeof (bfd_signed_vma) |
| 1685 | + sizeof (bfd_vma) + sizeof(char)); |
| 1686 | local_got_refcounts = (bfd_signed_vma *) |
| 1687 | bfd_zalloc (abfd, size); |
| 1688 | if (local_got_refcounts == NULL) |
| 1689 | goto error_return; |
| 1690 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 1691 | elf_x86_local_tlsdesc_gotent (abfd) |
| 1692 | = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); |
| 1693 | elf_x86_local_got_tls_type (abfd) |
| 1694 | = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); |
| 1695 | } |
| 1696 | local_got_refcounts[r_symndx] = 1; |
| 1697 | old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx]; |
| 1698 | } |
| 1699 | |
| 1700 | if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) |
| 1701 | tls_type |= old_tls_type; |
| 1702 | /* If a TLS symbol is accessed using IE at least once, |
| 1703 | there is no point to use dynamic model for it. */ |
| 1704 | else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN |
| 1705 | && (! GOT_TLS_GD_ANY_P (old_tls_type) |
| 1706 | || (tls_type & GOT_TLS_IE) == 0)) |
| 1707 | { |
| 1708 | if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type)) |
| 1709 | tls_type = old_tls_type; |
| 1710 | else if (GOT_TLS_GD_ANY_P (old_tls_type) |
| 1711 | && GOT_TLS_GD_ANY_P (tls_type)) |
| 1712 | tls_type |= old_tls_type; |
| 1713 | else |
| 1714 | { |
| 1715 | if (h) |
| 1716 | name = h->root.root.string; |
| 1717 | else |
| 1718 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, |
| 1719 | NULL); |
| 1720 | _bfd_error_handler |
| 1721 | /* xgettext:c-format */ |
| 1722 | (_("%pB: `%s' accessed both as normal and " |
| 1723 | "thread local symbol"), |
| 1724 | abfd, name); |
| 1725 | bfd_set_error (bfd_error_bad_value); |
| 1726 | goto error_return; |
| 1727 | } |
| 1728 | } |
| 1729 | |
| 1730 | if (old_tls_type != tls_type) |
| 1731 | { |
| 1732 | if (h != NULL) |
| 1733 | elf_x86_hash_entry (h)->tls_type = tls_type; |
| 1734 | else |
| 1735 | elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type; |
| 1736 | } |
| 1737 | } |
| 1738 | /* Fall through */ |
| 1739 | |
| 1740 | case R_386_GOTOFF: |
| 1741 | case R_386_GOTPC: |
| 1742 | create_got: |
| 1743 | if (r_type != R_386_TLS_IE) |
| 1744 | { |
| 1745 | if (eh != NULL) |
| 1746 | { |
| 1747 | eh->zero_undefweak &= 0x2; |
| 1748 | |
| 1749 | /* Need GOT to resolve undefined weak symbol to 0. */ |
| 1750 | if (r_type == R_386_GOTOFF |
| 1751 | && h->root.type == bfd_link_hash_undefweak |
| 1752 | && bfd_link_executable (info)) |
| 1753 | htab->got_referenced = TRUE; |
| 1754 | } |
| 1755 | break; |
| 1756 | } |
| 1757 | /* Fall through */ |
| 1758 | |
| 1759 | case R_386_TLS_LE_32: |
| 1760 | case R_386_TLS_LE: |
| 1761 | if (eh != NULL) |
| 1762 | eh->zero_undefweak &= 0x2; |
| 1763 | if (bfd_link_executable (info)) |
| 1764 | break; |
| 1765 | info->flags |= DF_STATIC_TLS; |
| 1766 | goto do_relocation; |
| 1767 | |
| 1768 | case R_386_32: |
| 1769 | case R_386_PC32: |
| 1770 | if (eh != NULL && (sec->flags & SEC_CODE) != 0) |
| 1771 | eh->zero_undefweak |= 0x2; |
| 1772 | do_relocation: |
| 1773 | /* We are called after all symbols have been resolved. Only |
| 1774 | relocation against STT_GNU_IFUNC symbol must go through |
| 1775 | PLT. */ |
| 1776 | if (h != NULL |
| 1777 | && (bfd_link_executable (info) |
| 1778 | || h->type == STT_GNU_IFUNC)) |
| 1779 | { |
| 1780 | bfd_boolean func_pointer_ref = FALSE; |
| 1781 | |
| 1782 | if (r_type == R_386_PC32) |
| 1783 | { |
| 1784 | /* Since something like ".long foo - ." may be used |
| 1785 | as pointer, make sure that PLT is used if foo is |
| 1786 | a function defined in a shared library. */ |
| 1787 | if ((sec->flags & SEC_CODE) == 0) |
| 1788 | h->pointer_equality_needed = 1; |
| 1789 | else if (h->type == STT_GNU_IFUNC |
| 1790 | && bfd_link_pic (info)) |
| 1791 | { |
| 1792 | _bfd_error_handler |
| 1793 | /* xgettext:c-format */ |
| 1794 | (_("%pB: unsupported non-PIC call to IFUNC `%s'"), |
| 1795 | abfd, h->root.root.string); |
| 1796 | bfd_set_error (bfd_error_bad_value); |
| 1797 | goto error_return; |
| 1798 | } |
| 1799 | } |
| 1800 | else |
| 1801 | { |
| 1802 | h->pointer_equality_needed = 1; |
| 1803 | /* R_386_32 can be resolved at run-time. */ |
| 1804 | if (r_type == R_386_32 |
| 1805 | && (sec->flags & SEC_READONLY) == 0) |
| 1806 | func_pointer_ref = TRUE; |
| 1807 | } |
| 1808 | |
| 1809 | if (!func_pointer_ref) |
| 1810 | { |
| 1811 | /* If this reloc is in a read-only section, we might |
| 1812 | need a copy reloc. We can't check reliably at this |
| 1813 | stage whether the section is read-only, as input |
| 1814 | sections have not yet been mapped to output sections. |
| 1815 | Tentatively set the flag for now, and correct in |
| 1816 | adjust_dynamic_symbol. */ |
| 1817 | h->non_got_ref = 1; |
| 1818 | |
| 1819 | /* We may need a .plt entry if the symbol is a function |
| 1820 | defined in a shared lib or is a function referenced |
| 1821 | from the code or read-only section. */ |
| 1822 | if (!h->def_regular |
| 1823 | || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0) |
| 1824 | h->plt.refcount = 1; |
| 1825 | } |
| 1826 | } |
| 1827 | |
| 1828 | size_reloc = FALSE; |
| 1829 | do_size: |
| 1830 | if (NEED_DYNAMIC_RELOCATION_P (info, FALSE, h, sec, r_type, |
| 1831 | R_386_32)) |
| 1832 | { |
| 1833 | struct elf_dyn_relocs *p; |
| 1834 | struct elf_dyn_relocs **head; |
| 1835 | |
| 1836 | /* We must copy these reloc types into the output file. |
| 1837 | Create a reloc section in dynobj and make room for |
| 1838 | this reloc. */ |
| 1839 | if (sreloc == NULL) |
| 1840 | { |
| 1841 | sreloc = _bfd_elf_make_dynamic_reloc_section |
| 1842 | (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE); |
| 1843 | |
| 1844 | if (sreloc == NULL) |
| 1845 | goto error_return; |
| 1846 | } |
| 1847 | |
| 1848 | /* If this is a global symbol, we count the number of |
| 1849 | relocations we need for this symbol. */ |
| 1850 | if (h != NULL) |
| 1851 | { |
| 1852 | head = &eh->dyn_relocs; |
| 1853 | } |
| 1854 | else |
| 1855 | { |
| 1856 | /* Track dynamic relocs needed for local syms too. |
| 1857 | We really need local syms available to do this |
| 1858 | easily. Oh well. */ |
| 1859 | void **vpp; |
| 1860 | asection *s; |
| 1861 | |
| 1862 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1863 | abfd, r_symndx); |
| 1864 | if (isym == NULL) |
| 1865 | goto error_return; |
| 1866 | |
| 1867 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 1868 | if (s == NULL) |
| 1869 | s = sec; |
| 1870 | |
| 1871 | vpp = &elf_section_data (s)->local_dynrel; |
| 1872 | head = (struct elf_dyn_relocs **)vpp; |
| 1873 | } |
| 1874 | |
| 1875 | p = *head; |
| 1876 | if (p == NULL || p->sec != sec) |
| 1877 | { |
| 1878 | bfd_size_type amt = sizeof *p; |
| 1879 | p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj, |
| 1880 | amt); |
| 1881 | if (p == NULL) |
| 1882 | goto error_return; |
| 1883 | p->next = *head; |
| 1884 | *head = p; |
| 1885 | p->sec = sec; |
| 1886 | p->count = 0; |
| 1887 | p->pc_count = 0; |
| 1888 | } |
| 1889 | |
| 1890 | p->count += 1; |
| 1891 | /* Count size relocation as PC-relative relocation. */ |
| 1892 | if (r_type == R_386_PC32 || size_reloc) |
| 1893 | p->pc_count += 1; |
| 1894 | } |
| 1895 | break; |
| 1896 | |
| 1897 | /* This relocation describes the C++ object vtable hierarchy. |
| 1898 | Reconstruct it for later use during GC. */ |
| 1899 | case R_386_GNU_VTINHERIT: |
| 1900 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 1901 | goto error_return; |
| 1902 | break; |
| 1903 | |
| 1904 | /* This relocation describes which C++ vtable entries are actually |
| 1905 | used. Record for later use during GC. */ |
| 1906 | case R_386_GNU_VTENTRY: |
| 1907 | if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
| 1908 | goto error_return; |
| 1909 | break; |
| 1910 | |
| 1911 | default: |
| 1912 | break; |
| 1913 | } |
| 1914 | } |
| 1915 | |
| 1916 | if (elf_section_data (sec)->this_hdr.contents != contents) |
| 1917 | { |
| 1918 | if (!converted && !info->keep_memory) |
| 1919 | free (contents); |
| 1920 | else |
| 1921 | { |
| 1922 | /* Cache the section contents for elf_link_input_bfd if any |
| 1923 | load is converted or --no-keep-memory isn't used. */ |
| 1924 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1925 | } |
| 1926 | } |
| 1927 | |
| 1928 | /* Cache relocations if any load is converted. */ |
| 1929 | if (elf_section_data (sec)->relocs != relocs && converted) |
| 1930 | elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs; |
| 1931 | |
| 1932 | return TRUE; |
| 1933 | |
| 1934 | error_return: |
| 1935 | if (elf_section_data (sec)->this_hdr.contents != contents) |
| 1936 | free (contents); |
| 1937 | sec->check_relocs_failed = 1; |
| 1938 | return FALSE; |
| 1939 | } |
| 1940 | |
| 1941 | /* Set the correct type for an x86 ELF section. We do this by the |
| 1942 | section name, which is a hack, but ought to work. */ |
| 1943 | |
| 1944 | static bfd_boolean |
| 1945 | elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, |
| 1946 | Elf_Internal_Shdr *hdr, |
| 1947 | asection *sec) |
| 1948 | { |
| 1949 | const char *name; |
| 1950 | |
| 1951 | name = bfd_get_section_name (abfd, sec); |
| 1952 | |
| 1953 | /* This is an ugly, but unfortunately necessary hack that is |
| 1954 | needed when producing EFI binaries on x86. It tells |
| 1955 | elf.c:elf_fake_sections() not to consider ".reloc" as a section |
| 1956 | containing ELF relocation info. We need this hack in order to |
| 1957 | be able to generate ELF binaries that can be translated into |
| 1958 | EFI applications (which are essentially COFF objects). Those |
| 1959 | files contain a COFF ".reloc" section inside an ELFNN object, |
| 1960 | which would normally cause BFD to segfault because it would |
| 1961 | attempt to interpret this section as containing relocation |
| 1962 | entries for section "oc". With this hack enabled, ".reloc" |
| 1963 | will be treated as a normal data section, which will avoid the |
| 1964 | segfault. However, you won't be able to create an ELFNN binary |
| 1965 | with a section named "oc" that needs relocations, but that's |
| 1966 | the kind of ugly side-effects you get when detecting section |
| 1967 | types based on their names... In practice, this limitation is |
| 1968 | unlikely to bite. */ |
| 1969 | if (strcmp (name, ".reloc") == 0) |
| 1970 | hdr->sh_type = SHT_PROGBITS; |
| 1971 | |
| 1972 | return TRUE; |
| 1973 | } |
| 1974 | |
| 1975 | /* Return the relocation value for @tpoff relocation |
| 1976 | if STT_TLS virtual address is ADDRESS. */ |
| 1977 | |
| 1978 | static bfd_vma |
| 1979 | elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address) |
| 1980 | { |
| 1981 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 1982 | const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); |
| 1983 | bfd_vma static_tls_size; |
| 1984 | |
| 1985 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 1986 | if (htab->tls_sec == NULL) |
| 1987 | return 0; |
| 1988 | |
| 1989 | /* Consider special static TLS alignment requirements. */ |
| 1990 | static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); |
| 1991 | return static_tls_size + htab->tls_sec->vma - address; |
| 1992 | } |
| 1993 | |
| 1994 | /* Relocate an i386 ELF section. */ |
| 1995 | |
| 1996 | static bfd_boolean |
| 1997 | elf_i386_relocate_section (bfd *output_bfd, |
| 1998 | struct bfd_link_info *info, |
| 1999 | bfd *input_bfd, |
| 2000 | asection *input_section, |
| 2001 | bfd_byte *contents, |
| 2002 | Elf_Internal_Rela *relocs, |
| 2003 | Elf_Internal_Sym *local_syms, |
| 2004 | asection **local_sections) |
| 2005 | { |
| 2006 | struct elf_x86_link_hash_table *htab; |
| 2007 | Elf_Internal_Shdr *symtab_hdr; |
| 2008 | struct elf_link_hash_entry **sym_hashes; |
| 2009 | bfd_vma *local_got_offsets; |
| 2010 | bfd_vma *local_tlsdesc_gotents; |
| 2011 | Elf_Internal_Rela *rel; |
| 2012 | Elf_Internal_Rela *wrel; |
| 2013 | Elf_Internal_Rela *relend; |
| 2014 | bfd_boolean is_vxworks_tls; |
| 2015 | unsigned plt_entry_size; |
| 2016 | |
| 2017 | /* Skip if check_relocs failed. */ |
| 2018 | if (input_section->check_relocs_failed) |
| 2019 | return FALSE; |
| 2020 | |
| 2021 | htab = elf_x86_hash_table (info, I386_ELF_DATA); |
| 2022 | if (htab == NULL) |
| 2023 | return FALSE; |
| 2024 | |
| 2025 | if (!is_x86_elf (input_bfd, htab)) |
| 2026 | { |
| 2027 | bfd_set_error (bfd_error_wrong_format); |
| 2028 | return FALSE; |
| 2029 | } |
| 2030 | |
| 2031 | symtab_hdr = &elf_symtab_hdr (input_bfd); |
| 2032 | sym_hashes = elf_sym_hashes (input_bfd); |
| 2033 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 2034 | local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd); |
| 2035 | /* We have to handle relocations in vxworks .tls_vars sections |
| 2036 | specially, because the dynamic loader is 'weird'. */ |
| 2037 | is_vxworks_tls = (htab->target_os == is_vxworks |
| 2038 | && bfd_link_pic (info) |
| 2039 | && !strcmp (input_section->output_section->name, |
| 2040 | ".tls_vars")); |
| 2041 | |
| 2042 | _bfd_x86_elf_set_tls_module_base (info); |
| 2043 | |
| 2044 | plt_entry_size = htab->plt.plt_entry_size; |
| 2045 | |
| 2046 | rel = wrel = relocs; |
| 2047 | relend = relocs + input_section->reloc_count; |
| 2048 | for (; rel < relend; wrel++, rel++) |
| 2049 | { |
| 2050 | unsigned int r_type, r_type_tls; |
| 2051 | reloc_howto_type *howto; |
| 2052 | unsigned long r_symndx; |
| 2053 | struct elf_link_hash_entry *h; |
| 2054 | struct elf_x86_link_hash_entry *eh; |
| 2055 | Elf_Internal_Sym *sym; |
| 2056 | asection *sec; |
| 2057 | bfd_vma off, offplt, plt_offset; |
| 2058 | bfd_vma relocation; |
| 2059 | bfd_boolean unresolved_reloc; |
| 2060 | bfd_reloc_status_type r; |
| 2061 | unsigned int indx; |
| 2062 | int tls_type; |
| 2063 | bfd_vma st_size; |
| 2064 | asection *resolved_plt; |
| 2065 | bfd_boolean resolved_to_zero; |
| 2066 | bfd_boolean relative_reloc; |
| 2067 | |
| 2068 | r_type = ELF32_R_TYPE (rel->r_info); |
| 2069 | if (r_type == R_386_GNU_VTINHERIT |
| 2070 | || r_type == R_386_GNU_VTENTRY) |
| 2071 | { |
| 2072 | if (wrel != rel) |
| 2073 | *wrel = *rel; |
| 2074 | continue; |
| 2075 | } |
| 2076 | |
| 2077 | howto = elf_i386_rtype_to_howto (r_type); |
| 2078 | if (howto == NULL) |
| 2079 | return _bfd_unrecognized_reloc (input_bfd, input_section, r_type); |
| 2080 | |
| 2081 | r_symndx = ELF32_R_SYM (rel->r_info); |
| 2082 | h = NULL; |
| 2083 | sym = NULL; |
| 2084 | sec = NULL; |
| 2085 | unresolved_reloc = FALSE; |
| 2086 | if (r_symndx < symtab_hdr->sh_info) |
| 2087 | { |
| 2088 | sym = local_syms + r_symndx; |
| 2089 | sec = local_sections[r_symndx]; |
| 2090 | relocation = (sec->output_section->vma |
| 2091 | + sec->output_offset |
| 2092 | + sym->st_value); |
| 2093 | st_size = sym->st_size; |
| 2094 | |
| 2095 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION |
| 2096 | && ((sec->flags & SEC_MERGE) != 0 |
| 2097 | || (bfd_link_relocatable (info) |
| 2098 | && sec->output_offset != 0))) |
| 2099 | { |
| 2100 | bfd_vma addend; |
| 2101 | bfd_byte *where = contents + rel->r_offset; |
| 2102 | |
| 2103 | switch (howto->size) |
| 2104 | { |
| 2105 | case 0: |
| 2106 | addend = bfd_get_8 (input_bfd, where); |
| 2107 | if (howto->pc_relative) |
| 2108 | { |
| 2109 | addend = (addend ^ 0x80) - 0x80; |
| 2110 | addend += 1; |
| 2111 | } |
| 2112 | break; |
| 2113 | case 1: |
| 2114 | addend = bfd_get_16 (input_bfd, where); |
| 2115 | if (howto->pc_relative) |
| 2116 | { |
| 2117 | addend = (addend ^ 0x8000) - 0x8000; |
| 2118 | addend += 2; |
| 2119 | } |
| 2120 | break; |
| 2121 | case 2: |
| 2122 | addend = bfd_get_32 (input_bfd, where); |
| 2123 | if (howto->pc_relative) |
| 2124 | { |
| 2125 | addend = (addend ^ 0x80000000) - 0x80000000; |
| 2126 | addend += 4; |
| 2127 | } |
| 2128 | break; |
| 2129 | default: |
| 2130 | abort (); |
| 2131 | } |
| 2132 | |
| 2133 | if (bfd_link_relocatable (info)) |
| 2134 | addend += sec->output_offset; |
| 2135 | else |
| 2136 | { |
| 2137 | asection *msec = sec; |
| 2138 | addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, |
| 2139 | addend); |
| 2140 | addend -= relocation; |
| 2141 | addend += msec->output_section->vma + msec->output_offset; |
| 2142 | } |
| 2143 | |
| 2144 | switch (howto->size) |
| 2145 | { |
| 2146 | case 0: |
| 2147 | /* FIXME: overflow checks. */ |
| 2148 | if (howto->pc_relative) |
| 2149 | addend -= 1; |
| 2150 | bfd_put_8 (input_bfd, addend, where); |
| 2151 | break; |
| 2152 | case 1: |
| 2153 | if (howto->pc_relative) |
| 2154 | addend -= 2; |
| 2155 | bfd_put_16 (input_bfd, addend, where); |
| 2156 | break; |
| 2157 | case 2: |
| 2158 | if (howto->pc_relative) |
| 2159 | addend -= 4; |
| 2160 | bfd_put_32 (input_bfd, addend, where); |
| 2161 | break; |
| 2162 | } |
| 2163 | } |
| 2164 | else if (!bfd_link_relocatable (info) |
| 2165 | && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) |
| 2166 | { |
| 2167 | /* Relocate against local STT_GNU_IFUNC symbol. */ |
| 2168 | h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel, |
| 2169 | FALSE); |
| 2170 | if (h == NULL) |
| 2171 | abort (); |
| 2172 | |
| 2173 | /* Set STT_GNU_IFUNC symbol value. */ |
| 2174 | h->root.u.def.value = sym->st_value; |
| 2175 | h->root.u.def.section = sec; |
| 2176 | } |
| 2177 | } |
| 2178 | else |
| 2179 | { |
| 2180 | bfd_boolean warned ATTRIBUTE_UNUSED; |
| 2181 | bfd_boolean ignored ATTRIBUTE_UNUSED; |
| 2182 | |
| 2183 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 2184 | r_symndx, symtab_hdr, sym_hashes, |
| 2185 | h, sec, relocation, |
| 2186 | unresolved_reloc, warned, ignored); |
| 2187 | st_size = h->size; |
| 2188 | } |
| 2189 | |
| 2190 | if (sec != NULL && discarded_section (sec)) |
| 2191 | { |
| 2192 | _bfd_clear_contents (howto, input_bfd, input_section, |
| 2193 | contents, rel->r_offset); |
| 2194 | wrel->r_offset = rel->r_offset; |
| 2195 | wrel->r_info = 0; |
| 2196 | wrel->r_addend = 0; |
| 2197 | |
| 2198 | /* For ld -r, remove relocations in debug sections against |
| 2199 | sections defined in discarded sections. Not done for |
| 2200 | eh_frame editing code expects to be present. */ |
| 2201 | if (bfd_link_relocatable (info) |
| 2202 | && (input_section->flags & SEC_DEBUGGING)) |
| 2203 | wrel--; |
| 2204 | |
| 2205 | continue; |
| 2206 | } |
| 2207 | |
| 2208 | if (bfd_link_relocatable (info)) |
| 2209 | { |
| 2210 | if (wrel != rel) |
| 2211 | *wrel = *rel; |
| 2212 | continue; |
| 2213 | } |
| 2214 | |
| 2215 | eh = (struct elf_x86_link_hash_entry *) h; |
| 2216 | |
| 2217 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle |
| 2218 | it here if it is defined in a non-shared object. */ |
| 2219 | if (h != NULL |
| 2220 | && h->type == STT_GNU_IFUNC |
| 2221 | && h->def_regular) |
| 2222 | { |
| 2223 | asection *gotplt, *base_got; |
| 2224 | bfd_vma plt_index; |
| 2225 | const char *name; |
| 2226 | |
| 2227 | if ((input_section->flags & SEC_ALLOC) == 0) |
| 2228 | { |
| 2229 | /* If this is a SHT_NOTE section without SHF_ALLOC, treat |
| 2230 | STT_GNU_IFUNC symbol as STT_FUNC. */ |
| 2231 | if (elf_section_type (input_section) == SHT_NOTE) |
| 2232 | goto skip_ifunc; |
| 2233 | /* Dynamic relocs are not propagated for SEC_DEBUGGING |
| 2234 | sections because such sections are not SEC_ALLOC and |
| 2235 | thus ld.so will not process them. */ |
| 2236 | if ((input_section->flags & SEC_DEBUGGING) != 0) |
| 2237 | continue; |
| 2238 | abort (); |
| 2239 | } |
| 2240 | |
| 2241 | /* STT_GNU_IFUNC symbol must go through PLT. */ |
| 2242 | if (htab->elf.splt != NULL) |
| 2243 | { |
| 2244 | if (htab->plt_second != NULL) |
| 2245 | { |
| 2246 | resolved_plt = htab->plt_second; |
| 2247 | plt_offset = eh->plt_second.offset; |
| 2248 | } |
| 2249 | else |
| 2250 | { |
| 2251 | resolved_plt = htab->elf.splt; |
| 2252 | plt_offset = h->plt.offset; |
| 2253 | } |
| 2254 | gotplt = htab->elf.sgotplt; |
| 2255 | } |
| 2256 | else |
| 2257 | { |
| 2258 | resolved_plt = htab->elf.iplt; |
| 2259 | plt_offset = h->plt.offset; |
| 2260 | gotplt = htab->elf.igotplt; |
| 2261 | } |
| 2262 | |
| 2263 | switch (r_type) |
| 2264 | { |
| 2265 | default: |
| 2266 | break; |
| 2267 | |
| 2268 | case R_386_GOT32: |
| 2269 | case R_386_GOT32X: |
| 2270 | base_got = htab->elf.sgot; |
| 2271 | off = h->got.offset; |
| 2272 | |
| 2273 | if (base_got == NULL) |
| 2274 | abort (); |
| 2275 | |
| 2276 | if (off == (bfd_vma) -1) |
| 2277 | { |
| 2278 | /* We can't use h->got.offset here to save state, or |
| 2279 | even just remember the offset, as finish_dynamic_symbol |
| 2280 | would use that as offset into .got. */ |
| 2281 | |
| 2282 | if (h->plt.offset == (bfd_vma) -1) |
| 2283 | abort (); |
| 2284 | |
| 2285 | if (htab->elf.splt != NULL) |
| 2286 | { |
| 2287 | plt_index = (h->plt.offset / plt_entry_size |
| 2288 | - htab->plt.has_plt0); |
| 2289 | off = (plt_index + 3) * 4; |
| 2290 | base_got = htab->elf.sgotplt; |
| 2291 | } |
| 2292 | else |
| 2293 | { |
| 2294 | plt_index = h->plt.offset / plt_entry_size; |
| 2295 | off = plt_index * 4; |
| 2296 | base_got = htab->elf.igotplt; |
| 2297 | } |
| 2298 | |
| 2299 | if (h->dynindx == -1 |
| 2300 | || h->forced_local |
| 2301 | || info->symbolic) |
| 2302 | { |
| 2303 | /* This references the local defitionion. We must |
| 2304 | initialize this entry in the global offset table. |
| 2305 | Since the offset must always be a multiple of 8, |
| 2306 | we use the least significant bit to record |
| 2307 | whether we have initialized it already. |
| 2308 | |
| 2309 | When doing a dynamic link, we create a .rela.got |
| 2310 | relocation entry to initialize the value. This |
| 2311 | is done in the finish_dynamic_symbol routine. */ |
| 2312 | if ((off & 1) != 0) |
| 2313 | off &= ~1; |
| 2314 | else |
| 2315 | { |
| 2316 | bfd_put_32 (output_bfd, relocation, |
| 2317 | base_got->contents + off); |
| 2318 | h->got.offset |= 1; |
| 2319 | } |
| 2320 | } |
| 2321 | |
| 2322 | relocation = off; |
| 2323 | } |
| 2324 | else |
| 2325 | relocation = (base_got->output_section->vma |
| 2326 | + base_got->output_offset + off |
| 2327 | - gotplt->output_section->vma |
| 2328 | - gotplt->output_offset); |
| 2329 | |
| 2330 | if (rel->r_offset > 1 |
| 2331 | && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5 |
| 2332 | && *(contents + rel->r_offset - 2) != 0x8d) |
| 2333 | { |
| 2334 | if (bfd_link_pic (info)) |
| 2335 | goto disallow_got32; |
| 2336 | |
| 2337 | /* Add the GOT base if there is no base register. */ |
| 2338 | relocation += (gotplt->output_section->vma |
| 2339 | + gotplt->output_offset); |
| 2340 | } |
| 2341 | else if (htab->elf.splt == NULL) |
| 2342 | { |
| 2343 | /* Adjust for static executables. */ |
| 2344 | relocation += gotplt->output_offset; |
| 2345 | } |
| 2346 | |
| 2347 | goto do_relocation; |
| 2348 | } |
| 2349 | |
| 2350 | if (h->plt.offset == (bfd_vma) -1) |
| 2351 | { |
| 2352 | /* Handle static pointers of STT_GNU_IFUNC symbols. */ |
| 2353 | if (r_type == R_386_32 |
| 2354 | && (input_section->flags & SEC_CODE) == 0) |
| 2355 | goto do_ifunc_pointer; |
| 2356 | goto bad_ifunc_reloc; |
| 2357 | } |
| 2358 | |
| 2359 | relocation = (resolved_plt->output_section->vma |
| 2360 | + resolved_plt->output_offset + plt_offset); |
| 2361 | |
| 2362 | switch (r_type) |
| 2363 | { |
| 2364 | default: |
| 2365 | bad_ifunc_reloc: |
| 2366 | if (h->root.root.string) |
| 2367 | name = h->root.root.string; |
| 2368 | else |
| 2369 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, |
| 2370 | NULL); |
| 2371 | _bfd_error_handler |
| 2372 | /* xgettext:c-format */ |
| 2373 | (_("%pB: relocation %s against STT_GNU_IFUNC " |
| 2374 | "symbol `%s' isn't supported"), input_bfd, |
| 2375 | howto->name, name); |
| 2376 | bfd_set_error (bfd_error_bad_value); |
| 2377 | return FALSE; |
| 2378 | |
| 2379 | case R_386_32: |
| 2380 | /* Generate dynamic relcoation only when there is a |
| 2381 | non-GOT reference in a shared object. */ |
| 2382 | if ((bfd_link_pic (info) && h->non_got_ref) |
| 2383 | || h->plt.offset == (bfd_vma) -1) |
| 2384 | { |
| 2385 | Elf_Internal_Rela outrel; |
| 2386 | asection *sreloc; |
| 2387 | bfd_vma offset; |
| 2388 | |
| 2389 | do_ifunc_pointer: |
| 2390 | /* Need a dynamic relocation to get the real function |
| 2391 | adddress. */ |
| 2392 | offset = _bfd_elf_section_offset (output_bfd, |
| 2393 | info, |
| 2394 | input_section, |
| 2395 | rel->r_offset); |
| 2396 | if (offset == (bfd_vma) -1 |
| 2397 | || offset == (bfd_vma) -2) |
| 2398 | abort (); |
| 2399 | |
| 2400 | outrel.r_offset = (input_section->output_section->vma |
| 2401 | + input_section->output_offset |
| 2402 | + offset); |
| 2403 | |
| 2404 | if (POINTER_LOCAL_IFUNC_P (info, h)) |
| 2405 | { |
| 2406 | info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), |
| 2407 | h->root.root.string, |
| 2408 | h->root.u.def.section->owner); |
| 2409 | |
| 2410 | /* This symbol is resolved locally. */ |
| 2411 | outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); |
| 2412 | bfd_put_32 (output_bfd, |
| 2413 | (h->root.u.def.value |
| 2414 | + h->root.u.def.section->output_section->vma |
| 2415 | + h->root.u.def.section->output_offset), |
| 2416 | contents + offset); |
| 2417 | } |
| 2418 | else |
| 2419 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 2420 | |
| 2421 | /* Dynamic relocations are stored in |
| 2422 | 1. .rel.ifunc section in PIC object. |
| 2423 | 2. .rel.got section in dynamic executable. |
| 2424 | 3. .rel.iplt section in static executable. */ |
| 2425 | if (bfd_link_pic (info)) |
| 2426 | sreloc = htab->elf.irelifunc; |
| 2427 | else if (htab->elf.splt != NULL) |
| 2428 | sreloc = htab->elf.srelgot; |
| 2429 | else |
| 2430 | sreloc = htab->elf.irelplt; |
| 2431 | elf_append_rel (output_bfd, sreloc, &outrel); |
| 2432 | |
| 2433 | /* If this reloc is against an external symbol, we |
| 2434 | do not want to fiddle with the addend. Otherwise, |
| 2435 | we need to include the symbol value so that it |
| 2436 | becomes an addend for the dynamic reloc. For an |
| 2437 | internal symbol, we have updated addend. */ |
| 2438 | continue; |
| 2439 | } |
| 2440 | /* FALLTHROUGH */ |
| 2441 | case R_386_PC32: |
| 2442 | case R_386_PLT32: |
| 2443 | goto do_relocation; |
| 2444 | |
| 2445 | case R_386_GOTOFF: |
| 2446 | relocation -= (gotplt->output_section->vma |
| 2447 | + gotplt->output_offset); |
| 2448 | goto do_relocation; |
| 2449 | } |
| 2450 | } |
| 2451 | |
| 2452 | skip_ifunc: |
| 2453 | resolved_to_zero = (eh != NULL |
| 2454 | && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh)); |
| 2455 | |
| 2456 | switch (r_type) |
| 2457 | { |
| 2458 | case R_386_GOT32X: |
| 2459 | case R_386_GOT32: |
| 2460 | /* Relocation is to the entry for this symbol in the global |
| 2461 | offset table. */ |
| 2462 | if (htab->elf.sgot == NULL) |
| 2463 | abort (); |
| 2464 | |
| 2465 | relative_reloc = FALSE; |
| 2466 | if (h != NULL) |
| 2467 | { |
| 2468 | off = h->got.offset; |
| 2469 | if (RESOLVED_LOCALLY_P (info, h, htab)) |
| 2470 | { |
| 2471 | /* We must initialize this entry in the global offset |
| 2472 | table. Since the offset must always be a multiple |
| 2473 | of 4, we use the least significant bit to record |
| 2474 | whether we have initialized it already. |
| 2475 | |
| 2476 | When doing a dynamic link, we create a .rel.got |
| 2477 | relocation entry to initialize the value. This |
| 2478 | is done in the finish_dynamic_symbol routine. */ |
| 2479 | if ((off & 1) != 0) |
| 2480 | off &= ~1; |
| 2481 | else |
| 2482 | { |
| 2483 | bfd_put_32 (output_bfd, relocation, |
| 2484 | htab->elf.sgot->contents + off); |
| 2485 | h->got.offset |= 1; |
| 2486 | |
| 2487 | if (GENERATE_RELATIVE_RELOC_P (info, h)) |
| 2488 | { |
| 2489 | /* PR ld/21402: If this symbol isn't dynamic |
| 2490 | in PIC, generate R_386_RELATIVE here. */ |
| 2491 | eh->no_finish_dynamic_symbol = 1; |
| 2492 | relative_reloc = TRUE; |
| 2493 | } |
| 2494 | } |
| 2495 | } |
| 2496 | else |
| 2497 | unresolved_reloc = FALSE; |
| 2498 | } |
| 2499 | else |
| 2500 | { |
| 2501 | if (local_got_offsets == NULL) |
| 2502 | abort (); |
| 2503 | |
| 2504 | off = local_got_offsets[r_symndx]; |
| 2505 | |
| 2506 | /* The offset must always be a multiple of 4. We use |
| 2507 | the least significant bit to record whether we have |
| 2508 | already generated the necessary reloc. */ |
| 2509 | if ((off & 1) != 0) |
| 2510 | off &= ~1; |
| 2511 | else |
| 2512 | { |
| 2513 | bfd_put_32 (output_bfd, relocation, |
| 2514 | htab->elf.sgot->contents + off); |
| 2515 | local_got_offsets[r_symndx] |= 1; |
| 2516 | |
| 2517 | if (bfd_link_pic (info)) |
| 2518 | relative_reloc = TRUE; |
| 2519 | } |
| 2520 | } |
| 2521 | |
| 2522 | if (relative_reloc) |
| 2523 | { |
| 2524 | asection *s; |
| 2525 | Elf_Internal_Rela outrel; |
| 2526 | |
| 2527 | s = htab->elf.srelgot; |
| 2528 | if (s == NULL) |
| 2529 | abort (); |
| 2530 | |
| 2531 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 2532 | + htab->elf.sgot->output_offset |
| 2533 | + off); |
| 2534 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2535 | elf_append_rel (output_bfd, s, &outrel); |
| 2536 | } |
| 2537 | |
| 2538 | if (off >= (bfd_vma) -2) |
| 2539 | abort (); |
| 2540 | |
| 2541 | relocation = (htab->elf.sgot->output_section->vma |
| 2542 | + htab->elf.sgot->output_offset + off); |
| 2543 | if (rel->r_offset > 1 |
| 2544 | && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5 |
| 2545 | && *(contents + rel->r_offset - 2) != 0x8d) |
| 2546 | { |
| 2547 | if (bfd_link_pic (info)) |
| 2548 | { |
| 2549 | /* For PIC, disallow R_386_GOT32 without a base |
| 2550 | register, except for "lea foo@GOT, %reg", since |
| 2551 | we don't know what the GOT base is. */ |
| 2552 | const char *name; |
| 2553 | |
| 2554 | disallow_got32: |
| 2555 | if (h == NULL || h->root.root.string == NULL) |
| 2556 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, |
| 2557 | NULL); |
| 2558 | else |
| 2559 | name = h->root.root.string; |
| 2560 | |
| 2561 | _bfd_error_handler |
| 2562 | /* xgettext:c-format */ |
| 2563 | (_("%pB: direct GOT relocation %s against `%s'" |
| 2564 | " without base register can not be used" |
| 2565 | " when making a shared object"), |
| 2566 | input_bfd, howto->name, name); |
| 2567 | bfd_set_error (bfd_error_bad_value); |
| 2568 | return FALSE; |
| 2569 | } |
| 2570 | } |
| 2571 | else |
| 2572 | { |
| 2573 | /* Subtract the .got.plt section address only with a base |
| 2574 | register. */ |
| 2575 | relocation -= (htab->elf.sgotplt->output_section->vma |
| 2576 | + htab->elf.sgotplt->output_offset); |
| 2577 | } |
| 2578 | |
| 2579 | break; |
| 2580 | |
| 2581 | case R_386_GOTOFF: |
| 2582 | /* Relocation is relative to the start of the global offset |
| 2583 | table. */ |
| 2584 | |
| 2585 | /* Check to make sure it isn't a protected function or data |
| 2586 | symbol for shared library since it may not be local when |
| 2587 | used as function address or with copy relocation. We also |
| 2588 | need to make sure that a symbol is referenced locally. */ |
| 2589 | if (!bfd_link_executable (info) && h) |
| 2590 | { |
| 2591 | if (!h->def_regular) |
| 2592 | { |
| 2593 | const char *v; |
| 2594 | |
| 2595 | switch (ELF_ST_VISIBILITY (h->other)) |
| 2596 | { |
| 2597 | case STV_HIDDEN: |
| 2598 | v = _("hidden symbol"); |
| 2599 | break; |
| 2600 | case STV_INTERNAL: |
| 2601 | v = _("internal symbol"); |
| 2602 | break; |
| 2603 | case STV_PROTECTED: |
| 2604 | v = _("protected symbol"); |
| 2605 | break; |
| 2606 | default: |
| 2607 | v = _("symbol"); |
| 2608 | break; |
| 2609 | } |
| 2610 | |
| 2611 | _bfd_error_handler |
| 2612 | /* xgettext:c-format */ |
| 2613 | (_("%pB: relocation R_386_GOTOFF against undefined %s" |
| 2614 | " `%s' can not be used when making a shared object"), |
| 2615 | input_bfd, v, h->root.root.string); |
| 2616 | bfd_set_error (bfd_error_bad_value); |
| 2617 | return FALSE; |
| 2618 | } |
| 2619 | else if (!SYMBOL_REFERENCES_LOCAL_P (info, h) |
| 2620 | && (h->type == STT_FUNC |
| 2621 | || h->type == STT_OBJECT) |
| 2622 | && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 2623 | { |
| 2624 | _bfd_error_handler |
| 2625 | /* xgettext:c-format */ |
| 2626 | (_("%pB: relocation R_386_GOTOFF against protected %s" |
| 2627 | " `%s' can not be used when making a shared object"), |
| 2628 | input_bfd, |
| 2629 | h->type == STT_FUNC ? "function" : "data", |
| 2630 | h->root.root.string); |
| 2631 | bfd_set_error (bfd_error_bad_value); |
| 2632 | return FALSE; |
| 2633 | } |
| 2634 | } |
| 2635 | |
| 2636 | /* Note that sgot is not involved in this |
| 2637 | calculation. We always want the start of .got.plt. If we |
| 2638 | defined _GLOBAL_OFFSET_TABLE_ in a different way, as is |
| 2639 | permitted by the ABI, we might have to change this |
| 2640 | calculation. */ |
| 2641 | relocation -= htab->elf.sgotplt->output_section->vma |
| 2642 | + htab->elf.sgotplt->output_offset; |
| 2643 | break; |
| 2644 | |
| 2645 | case R_386_GOTPC: |
| 2646 | /* Use global offset table as symbol value. */ |
| 2647 | relocation = htab->elf.sgotplt->output_section->vma |
| 2648 | + htab->elf.sgotplt->output_offset; |
| 2649 | unresolved_reloc = FALSE; |
| 2650 | break; |
| 2651 | |
| 2652 | case R_386_PLT32: |
| 2653 | /* Relocation is to the entry for this symbol in the |
| 2654 | procedure linkage table. */ |
| 2655 | |
| 2656 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 2657 | without using the procedure linkage table. */ |
| 2658 | if (h == NULL) |
| 2659 | break; |
| 2660 | |
| 2661 | if ((h->plt.offset == (bfd_vma) -1 |
| 2662 | && eh->plt_got.offset == (bfd_vma) -1) |
| 2663 | || htab->elf.splt == NULL) |
| 2664 | { |
| 2665 | /* We didn't make a PLT entry for this symbol. This |
| 2666 | happens when statically linking PIC code, or when |
| 2667 | using -Bsymbolic. */ |
| 2668 | break; |
| 2669 | } |
| 2670 | |
| 2671 | if (h->plt.offset != (bfd_vma) -1) |
| 2672 | { |
| 2673 | if (htab->plt_second != NULL) |
| 2674 | { |
| 2675 | resolved_plt = htab->plt_second; |
| 2676 | plt_offset = eh->plt_second.offset; |
| 2677 | } |
| 2678 | else |
| 2679 | { |
| 2680 | resolved_plt = htab->elf.splt; |
| 2681 | plt_offset = h->plt.offset; |
| 2682 | } |
| 2683 | } |
| 2684 | else |
| 2685 | { |
| 2686 | resolved_plt = htab->plt_got; |
| 2687 | plt_offset = eh->plt_got.offset; |
| 2688 | } |
| 2689 | |
| 2690 | relocation = (resolved_plt->output_section->vma |
| 2691 | + resolved_plt->output_offset |
| 2692 | + plt_offset); |
| 2693 | unresolved_reloc = FALSE; |
| 2694 | break; |
| 2695 | |
| 2696 | case R_386_SIZE32: |
| 2697 | /* Set to symbol size. */ |
| 2698 | relocation = st_size; |
| 2699 | /* Fall through. */ |
| 2700 | |
| 2701 | case R_386_32: |
| 2702 | case R_386_PC32: |
| 2703 | if ((input_section->flags & SEC_ALLOC) == 0 |
| 2704 | || is_vxworks_tls) |
| 2705 | break; |
| 2706 | |
| 2707 | if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type, |
| 2708 | FALSE, resolved_to_zero, |
| 2709 | (r_type == R_386_PC32))) |
| 2710 | { |
| 2711 | Elf_Internal_Rela outrel; |
| 2712 | bfd_boolean skip, relocate; |
| 2713 | asection *sreloc; |
| 2714 | |
| 2715 | /* When generating a shared object, these relocations |
| 2716 | are copied into the output file to be resolved at run |
| 2717 | time. */ |
| 2718 | |
| 2719 | skip = FALSE; |
| 2720 | relocate = FALSE; |
| 2721 | |
| 2722 | outrel.r_offset = |
| 2723 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 2724 | rel->r_offset); |
| 2725 | if (outrel.r_offset == (bfd_vma) -1) |
| 2726 | skip = TRUE; |
| 2727 | else if (outrel.r_offset == (bfd_vma) -2) |
| 2728 | skip = TRUE, relocate = TRUE; |
| 2729 | outrel.r_offset += (input_section->output_section->vma |
| 2730 | + input_section->output_offset); |
| 2731 | |
| 2732 | if (skip) |
| 2733 | memset (&outrel, 0, sizeof outrel); |
| 2734 | else if (COPY_INPUT_RELOC_P (info, h, r_type)) |
| 2735 | outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); |
| 2736 | else |
| 2737 | { |
| 2738 | /* This symbol is local, or marked to become local. */ |
| 2739 | relocate = TRUE; |
| 2740 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2741 | } |
| 2742 | |
| 2743 | sreloc = elf_section_data (input_section)->sreloc; |
| 2744 | |
| 2745 | if (sreloc == NULL || sreloc->contents == NULL) |
| 2746 | { |
| 2747 | r = bfd_reloc_notsupported; |
| 2748 | goto check_relocation_error; |
| 2749 | } |
| 2750 | |
| 2751 | elf_append_rel (output_bfd, sreloc, &outrel); |
| 2752 | |
| 2753 | /* If this reloc is against an external symbol, we do |
| 2754 | not want to fiddle with the addend. Otherwise, we |
| 2755 | need to include the symbol value so that it becomes |
| 2756 | an addend for the dynamic reloc. */ |
| 2757 | if (! relocate) |
| 2758 | continue; |
| 2759 | } |
| 2760 | break; |
| 2761 | |
| 2762 | case R_386_TLS_IE: |
| 2763 | if (!bfd_link_executable (info)) |
| 2764 | { |
| 2765 | Elf_Internal_Rela outrel; |
| 2766 | asection *sreloc; |
| 2767 | |
| 2768 | outrel.r_offset = rel->r_offset |
| 2769 | + input_section->output_section->vma |
| 2770 | + input_section->output_offset; |
| 2771 | outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 2772 | sreloc = elf_section_data (input_section)->sreloc; |
| 2773 | if (sreloc == NULL) |
| 2774 | abort (); |
| 2775 | elf_append_rel (output_bfd, sreloc, &outrel); |
| 2776 | } |
| 2777 | /* Fall through */ |
| 2778 | |
| 2779 | case R_386_TLS_GD: |
| 2780 | case R_386_TLS_GOTDESC: |
| 2781 | case R_386_TLS_DESC_CALL: |
| 2782 | case R_386_TLS_IE_32: |
| 2783 | case R_386_TLS_GOTIE: |
| 2784 | tls_type = GOT_UNKNOWN; |
| 2785 | if (h == NULL && local_got_offsets) |
| 2786 | tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx]; |
| 2787 | else if (h != NULL) |
| 2788 | tls_type = elf_x86_hash_entry(h)->tls_type; |
| 2789 | if (tls_type == GOT_TLS_IE) |
| 2790 | tls_type = GOT_TLS_IE_NEG; |
| 2791 | |
| 2792 | r_type_tls = r_type; |
| 2793 | if (! elf_i386_tls_transition (info, input_bfd, |
| 2794 | input_section, contents, |
| 2795 | symtab_hdr, sym_hashes, |
| 2796 | &r_type_tls, tls_type, rel, |
| 2797 | relend, h, r_symndx, TRUE)) |
| 2798 | return FALSE; |
| 2799 | |
| 2800 | if (r_type_tls == R_386_TLS_LE_32) |
| 2801 | { |
| 2802 | BFD_ASSERT (! unresolved_reloc); |
| 2803 | if (r_type == R_386_TLS_GD) |
| 2804 | { |
| 2805 | unsigned int type; |
| 2806 | bfd_vma roff; |
| 2807 | |
| 2808 | /* GD->LE transition. */ |
| 2809 | type = *(contents + rel->r_offset - 2); |
| 2810 | if (type == 0x04) |
| 2811 | { |
| 2812 | /* Change |
| 2813 | leal foo@tlsgd(,%ebx,1), %eax |
| 2814 | call ___tls_get_addr@PLT |
| 2815 | into: |
| 2816 | movl %gs:0, %eax |
| 2817 | subl $foo@tpoff, %eax |
| 2818 | (6 byte form of subl). */ |
| 2819 | roff = rel->r_offset + 5; |
| 2820 | } |
| 2821 | else |
| 2822 | { |
| 2823 | /* Change |
| 2824 | leal foo@tlsgd(%ebx), %eax |
| 2825 | call ___tls_get_addr@PLT |
| 2826 | nop |
| 2827 | or |
| 2828 | leal foo@tlsgd(%reg), %eax |
| 2829 | call *___tls_get_addr@GOT(%reg) |
| 2830 | which may be converted to |
| 2831 | addr32 call ___tls_get_addr |
| 2832 | into: |
| 2833 | movl %gs:0, %eax; subl $foo@tpoff, %eax |
| 2834 | (6 byte form of subl). */ |
| 2835 | roff = rel->r_offset + 6; |
| 2836 | } |
| 2837 | memcpy (contents + roff - 8, |
| 2838 | "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12); |
| 2839 | bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), |
| 2840 | contents + roff); |
| 2841 | /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */ |
| 2842 | rel++; |
| 2843 | wrel++; |
| 2844 | continue; |
| 2845 | } |
| 2846 | else if (r_type == R_386_TLS_GOTDESC) |
| 2847 | { |
| 2848 | /* GDesc -> LE transition. |
| 2849 | It's originally something like: |
| 2850 | leal x@tlsdesc(%ebx), %eax |
| 2851 | |
| 2852 | leal x@ntpoff, %eax |
| 2853 | |
| 2854 | Registers other than %eax may be set up here. */ |
| 2855 | |
| 2856 | unsigned int val; |
| 2857 | bfd_vma roff; |
| 2858 | |
| 2859 | roff = rel->r_offset; |
| 2860 | val = bfd_get_8 (input_bfd, contents + roff - 1); |
| 2861 | |
| 2862 | /* Now modify the instruction as appropriate. */ |
| 2863 | /* aoliva FIXME: remove the above and xor the byte |
| 2864 | below with 0x86. */ |
| 2865 | bfd_put_8 (output_bfd, val ^ 0x86, |
| 2866 | contents + roff - 1); |
| 2867 | bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), |
| 2868 | contents + roff); |
| 2869 | continue; |
| 2870 | } |
| 2871 | else if (r_type == R_386_TLS_DESC_CALL) |
| 2872 | { |
| 2873 | /* GDesc -> LE transition. |
| 2874 | It's originally: |
| 2875 | call *(%eax) |
| 2876 | Turn it into: |
| 2877 | xchg %ax,%ax */ |
| 2878 | |
| 2879 | bfd_vma roff; |
| 2880 | |
| 2881 | roff = rel->r_offset; |
| 2882 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 2883 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 2884 | continue; |
| 2885 | } |
| 2886 | else if (r_type == R_386_TLS_IE) |
| 2887 | { |
| 2888 | unsigned int val; |
| 2889 | |
| 2890 | /* IE->LE transition: |
| 2891 | Originally it can be one of: |
| 2892 | movl foo, %eax |
| 2893 | movl foo, %reg |
| 2894 | addl foo, %reg |
| 2895 | We change it into: |
| 2896 | movl $foo, %eax |
| 2897 | movl $foo, %reg |
| 2898 | addl $foo, %reg. */ |
| 2899 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2900 | if (val == 0xa1) |
| 2901 | { |
| 2902 | /* movl foo, %eax. */ |
| 2903 | bfd_put_8 (output_bfd, 0xb8, |
| 2904 | contents + rel->r_offset - 1); |
| 2905 | } |
| 2906 | else |
| 2907 | { |
| 2908 | unsigned int type; |
| 2909 | |
| 2910 | type = bfd_get_8 (input_bfd, |
| 2911 | contents + rel->r_offset - 2); |
| 2912 | switch (type) |
| 2913 | { |
| 2914 | case 0x8b: |
| 2915 | /* movl */ |
| 2916 | bfd_put_8 (output_bfd, 0xc7, |
| 2917 | contents + rel->r_offset - 2); |
| 2918 | bfd_put_8 (output_bfd, |
| 2919 | 0xc0 | ((val >> 3) & 7), |
| 2920 | contents + rel->r_offset - 1); |
| 2921 | break; |
| 2922 | case 0x03: |
| 2923 | /* addl */ |
| 2924 | bfd_put_8 (output_bfd, 0x81, |
| 2925 | contents + rel->r_offset - 2); |
| 2926 | bfd_put_8 (output_bfd, |
| 2927 | 0xc0 | ((val >> 3) & 7), |
| 2928 | contents + rel->r_offset - 1); |
| 2929 | break; |
| 2930 | default: |
| 2931 | BFD_FAIL (); |
| 2932 | break; |
| 2933 | } |
| 2934 | } |
| 2935 | bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), |
| 2936 | contents + rel->r_offset); |
| 2937 | continue; |
| 2938 | } |
| 2939 | else |
| 2940 | { |
| 2941 | unsigned int val, type; |
| 2942 | |
| 2943 | /* {IE_32,GOTIE}->LE transition: |
| 2944 | Originally it can be one of: |
| 2945 | subl foo(%reg1), %reg2 |
| 2946 | movl foo(%reg1), %reg2 |
| 2947 | addl foo(%reg1), %reg2 |
| 2948 | We change it into: |
| 2949 | subl $foo, %reg2 |
| 2950 | movl $foo, %reg2 (6 byte form) |
| 2951 | addl $foo, %reg2. */ |
| 2952 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2953 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2954 | if (type == 0x8b) |
| 2955 | { |
| 2956 | /* movl */ |
| 2957 | bfd_put_8 (output_bfd, 0xc7, |
| 2958 | contents + rel->r_offset - 2); |
| 2959 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 2960 | contents + rel->r_offset - 1); |
| 2961 | } |
| 2962 | else if (type == 0x2b) |
| 2963 | { |
| 2964 | /* subl */ |
| 2965 | bfd_put_8 (output_bfd, 0x81, |
| 2966 | contents + rel->r_offset - 2); |
| 2967 | bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7), |
| 2968 | contents + rel->r_offset - 1); |
| 2969 | } |
| 2970 | else if (type == 0x03) |
| 2971 | { |
| 2972 | /* addl */ |
| 2973 | bfd_put_8 (output_bfd, 0x81, |
| 2974 | contents + rel->r_offset - 2); |
| 2975 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 2976 | contents + rel->r_offset - 1); |
| 2977 | } |
| 2978 | else |
| 2979 | BFD_FAIL (); |
| 2980 | if (r_type == R_386_TLS_GOTIE) |
| 2981 | bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation), |
| 2982 | contents + rel->r_offset); |
| 2983 | else |
| 2984 | bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation), |
| 2985 | contents + rel->r_offset); |
| 2986 | continue; |
| 2987 | } |
| 2988 | } |
| 2989 | |
| 2990 | if (htab->elf.sgot == NULL) |
| 2991 | abort (); |
| 2992 | |
| 2993 | if (h != NULL) |
| 2994 | { |
| 2995 | off = h->got.offset; |
| 2996 | offplt = elf_x86_hash_entry (h)->tlsdesc_got; |
| 2997 | } |
| 2998 | else |
| 2999 | { |
| 3000 | if (local_got_offsets == NULL) |
| 3001 | abort (); |
| 3002 | |
| 3003 | off = local_got_offsets[r_symndx]; |
| 3004 | offplt = local_tlsdesc_gotents[r_symndx]; |
| 3005 | } |
| 3006 | |
| 3007 | if ((off & 1) != 0) |
| 3008 | off &= ~1; |
| 3009 | else |
| 3010 | { |
| 3011 | Elf_Internal_Rela outrel; |
| 3012 | int dr_type; |
| 3013 | asection *sreloc; |
| 3014 | |
| 3015 | if (htab->elf.srelgot == NULL) |
| 3016 | abort (); |
| 3017 | |
| 3018 | indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| 3019 | |
| 3020 | if (GOT_TLS_GDESC_P (tls_type)) |
| 3021 | { |
| 3022 | bfd_byte *loc; |
| 3023 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC); |
| 3024 | BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8 |
| 3025 | <= htab->elf.sgotplt->size); |
| 3026 | outrel.r_offset = (htab->elf.sgotplt->output_section->vma |
| 3027 | + htab->elf.sgotplt->output_offset |
| 3028 | + offplt |
| 3029 | + htab->sgotplt_jump_table_size); |
| 3030 | sreloc = htab->elf.srelplt; |
| 3031 | loc = sreloc->contents; |
| 3032 | loc += (htab->next_tls_desc_index++ |
| 3033 | * sizeof (Elf32_External_Rel)); |
| 3034 | BFD_ASSERT (loc + sizeof (Elf32_External_Rel) |
| 3035 | <= sreloc->contents + sreloc->size); |
| 3036 | bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); |
| 3037 | if (indx == 0) |
| 3038 | { |
| 3039 | BFD_ASSERT (! unresolved_reloc); |
| 3040 | bfd_put_32 (output_bfd, |
| 3041 | relocation - _bfd_x86_elf_dtpoff_base (info), |
| 3042 | htab->elf.sgotplt->contents + offplt |
| 3043 | + htab->sgotplt_jump_table_size + 4); |
| 3044 | } |
| 3045 | else |
| 3046 | { |
| 3047 | bfd_put_32 (output_bfd, 0, |
| 3048 | htab->elf.sgotplt->contents + offplt |
| 3049 | + htab->sgotplt_jump_table_size + 4); |
| 3050 | } |
| 3051 | } |
| 3052 | |
| 3053 | sreloc = htab->elf.srelgot; |
| 3054 | |
| 3055 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 3056 | + htab->elf.sgot->output_offset + off); |
| 3057 | |
| 3058 | if (GOT_TLS_GD_P (tls_type)) |
| 3059 | dr_type = R_386_TLS_DTPMOD32; |
| 3060 | else if (GOT_TLS_GDESC_P (tls_type)) |
| 3061 | goto dr_done; |
| 3062 | else if (tls_type == GOT_TLS_IE_POS) |
| 3063 | dr_type = R_386_TLS_TPOFF; |
| 3064 | else |
| 3065 | dr_type = R_386_TLS_TPOFF32; |
| 3066 | |
| 3067 | if (dr_type == R_386_TLS_TPOFF && indx == 0) |
| 3068 | bfd_put_32 (output_bfd, |
| 3069 | relocation - _bfd_x86_elf_dtpoff_base (info), |
| 3070 | htab->elf.sgot->contents + off); |
| 3071 | else if (dr_type == R_386_TLS_TPOFF32 && indx == 0) |
| 3072 | bfd_put_32 (output_bfd, |
| 3073 | _bfd_x86_elf_dtpoff_base (info) - relocation, |
| 3074 | htab->elf.sgot->contents + off); |
| 3075 | else if (dr_type != R_386_TLS_DESC) |
| 3076 | bfd_put_32 (output_bfd, 0, |
| 3077 | htab->elf.sgot->contents + off); |
| 3078 | outrel.r_info = ELF32_R_INFO (indx, dr_type); |
| 3079 | |
| 3080 | elf_append_rel (output_bfd, sreloc, &outrel); |
| 3081 | |
| 3082 | if (GOT_TLS_GD_P (tls_type)) |
| 3083 | { |
| 3084 | if (indx == 0) |
| 3085 | { |
| 3086 | BFD_ASSERT (! unresolved_reloc); |
| 3087 | bfd_put_32 (output_bfd, |
| 3088 | relocation - _bfd_x86_elf_dtpoff_base (info), |
| 3089 | htab->elf.sgot->contents + off + 4); |
| 3090 | } |
| 3091 | else |
| 3092 | { |
| 3093 | bfd_put_32 (output_bfd, 0, |
| 3094 | htab->elf.sgot->contents + off + 4); |
| 3095 | outrel.r_info = ELF32_R_INFO (indx, |
| 3096 | R_386_TLS_DTPOFF32); |
| 3097 | outrel.r_offset += 4; |
| 3098 | elf_append_rel (output_bfd, sreloc, &outrel); |
| 3099 | } |
| 3100 | } |
| 3101 | else if (tls_type == GOT_TLS_IE_BOTH) |
| 3102 | { |
| 3103 | bfd_put_32 (output_bfd, |
| 3104 | (indx == 0 |
| 3105 | ? relocation - _bfd_x86_elf_dtpoff_base (info) |
| 3106 | : 0), |
| 3107 | htab->elf.sgot->contents + off + 4); |
| 3108 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); |
| 3109 | outrel.r_offset += 4; |
| 3110 | elf_append_rel (output_bfd, sreloc, &outrel); |
| 3111 | } |
| 3112 | |
| 3113 | dr_done: |
| 3114 | if (h != NULL) |
| 3115 | h->got.offset |= 1; |
| 3116 | else |
| 3117 | local_got_offsets[r_symndx] |= 1; |
| 3118 | } |
| 3119 | |
| 3120 | if (off >= (bfd_vma) -2 |
| 3121 | && ! GOT_TLS_GDESC_P (tls_type)) |
| 3122 | abort (); |
| 3123 | if (r_type_tls == R_386_TLS_GOTDESC |
| 3124 | || r_type_tls == R_386_TLS_DESC_CALL) |
| 3125 | { |
| 3126 | relocation = htab->sgotplt_jump_table_size + offplt; |
| 3127 | unresolved_reloc = FALSE; |
| 3128 | } |
| 3129 | else if (r_type_tls == r_type) |
| 3130 | { |
| 3131 | bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma |
| 3132 | + htab->elf.sgotplt->output_offset; |
| 3133 | relocation = htab->elf.sgot->output_section->vma |
| 3134 | + htab->elf.sgot->output_offset + off - g_o_t; |
| 3135 | if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE) |
| 3136 | && tls_type == GOT_TLS_IE_BOTH) |
| 3137 | relocation += 4; |
| 3138 | if (r_type == R_386_TLS_IE) |
| 3139 | relocation += g_o_t; |
| 3140 | unresolved_reloc = FALSE; |
| 3141 | } |
| 3142 | else if (r_type == R_386_TLS_GD) |
| 3143 | { |
| 3144 | unsigned int val, type; |
| 3145 | bfd_vma roff; |
| 3146 | |
| 3147 | /* GD->IE transition. */ |
| 3148 | type = *(contents + rel->r_offset - 2); |
| 3149 | val = *(contents + rel->r_offset - 1); |
| 3150 | if (type == 0x04) |
| 3151 | { |
| 3152 | /* Change |
| 3153 | leal foo@tlsgd(,%ebx,1), %eax |
| 3154 | call ___tls_get_addr@PLT |
| 3155 | into: |
| 3156 | movl %gs:0, %eax |
| 3157 | subl $foo@gottpoff(%ebx), %eax. */ |
| 3158 | val >>= 3; |
| 3159 | roff = rel->r_offset - 3; |
| 3160 | } |
| 3161 | else |
| 3162 | { |
| 3163 | /* Change |
| 3164 | leal foo@tlsgd(%ebx), %eax |
| 3165 | call ___tls_get_addr@PLT |
| 3166 | nop |
| 3167 | or |
| 3168 | leal foo@tlsgd(%reg), %eax |
| 3169 | call *___tls_get_addr@GOT(%reg) |
| 3170 | which may be converted to |
| 3171 | addr32 call ___tls_get_addr |
| 3172 | into: |
| 3173 | movl %gs:0, %eax; |
| 3174 | subl $foo@gottpoff(%reg), %eax. */ |
| 3175 | roff = rel->r_offset - 2; |
| 3176 | } |
| 3177 | memcpy (contents + roff, |
| 3178 | "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12); |
| 3179 | contents[roff + 7] = 0x80 | (val & 7); |
| 3180 | /* If foo is used only with foo@gotntpoff(%reg) and |
| 3181 | foo@indntpoff, but not with foo@gottpoff(%reg), change |
| 3182 | subl $foo@gottpoff(%reg), %eax |
| 3183 | into: |
| 3184 | addl $foo@gotntpoff(%reg), %eax. */ |
| 3185 | if (tls_type == GOT_TLS_IE_POS) |
| 3186 | contents[roff + 6] = 0x03; |
| 3187 | bfd_put_32 (output_bfd, |
| 3188 | htab->elf.sgot->output_section->vma |
| 3189 | + htab->elf.sgot->output_offset + off |
| 3190 | - htab->elf.sgotplt->output_section->vma |
| 3191 | - htab->elf.sgotplt->output_offset, |
| 3192 | contents + roff + 8); |
| 3193 | /* Skip R_386_PLT32 and R_386_GOT32X. */ |
| 3194 | rel++; |
| 3195 | wrel++; |
| 3196 | continue; |
| 3197 | } |
| 3198 | else if (r_type == R_386_TLS_GOTDESC) |
| 3199 | { |
| 3200 | /* GDesc -> IE transition. |
| 3201 | It's originally something like: |
| 3202 | leal x@tlsdesc(%ebx), %eax |
| 3203 | |
| 3204 | Change it to: |
| 3205 | movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax |
| 3206 | or: |
| 3207 | movl x@gottpoff(%ebx), %eax # before negl %eax |
| 3208 | |
| 3209 | Registers other than %eax may be set up here. */ |
| 3210 | |
| 3211 | bfd_vma roff; |
| 3212 | |
| 3213 | /* First, make sure it's a leal adding ebx to a 32-bit |
| 3214 | offset into any register, although it's probably |
| 3215 | almost always going to be eax. */ |
| 3216 | roff = rel->r_offset; |
| 3217 | |
| 3218 | /* Now modify the instruction as appropriate. */ |
| 3219 | /* To turn a leal into a movl in the form we use it, it |
| 3220 | suffices to change the first byte from 0x8d to 0x8b. |
| 3221 | aoliva FIXME: should we decide to keep the leal, all |
| 3222 | we have to do is remove the statement below, and |
| 3223 | adjust the relaxation of R_386_TLS_DESC_CALL. */ |
| 3224 | bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); |
| 3225 | |
| 3226 | if (tls_type == GOT_TLS_IE_BOTH) |
| 3227 | off += 4; |
| 3228 | |
| 3229 | bfd_put_32 (output_bfd, |
| 3230 | htab->elf.sgot->output_section->vma |
| 3231 | + htab->elf.sgot->output_offset + off |
| 3232 | - htab->elf.sgotplt->output_section->vma |
| 3233 | - htab->elf.sgotplt->output_offset, |
| 3234 | contents + roff); |
| 3235 | continue; |
| 3236 | } |
| 3237 | else if (r_type == R_386_TLS_DESC_CALL) |
| 3238 | { |
| 3239 | /* GDesc -> IE transition. |
| 3240 | It's originally: |
| 3241 | call *(%eax) |
| 3242 | |
| 3243 | Change it to: |
| 3244 | xchg %ax,%ax |
| 3245 | or |
| 3246 | negl %eax |
| 3247 | depending on how we transformed the TLS_GOTDESC above. |
| 3248 | */ |
| 3249 | |
| 3250 | bfd_vma roff; |
| 3251 | |
| 3252 | roff = rel->r_offset; |
| 3253 | |
| 3254 | /* Now modify the instruction as appropriate. */ |
| 3255 | if (tls_type != GOT_TLS_IE_NEG) |
| 3256 | { |
| 3257 | /* xchg %ax,%ax */ |
| 3258 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 3259 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 3260 | } |
| 3261 | else |
| 3262 | { |
| 3263 | /* negl %eax */ |
| 3264 | bfd_put_8 (output_bfd, 0xf7, contents + roff); |
| 3265 | bfd_put_8 (output_bfd, 0xd8, contents + roff + 1); |
| 3266 | } |
| 3267 | |
| 3268 | continue; |
| 3269 | } |
| 3270 | else |
| 3271 | BFD_ASSERT (FALSE); |
| 3272 | break; |
| 3273 | |
| 3274 | case R_386_TLS_LDM: |
| 3275 | if (! elf_i386_tls_transition (info, input_bfd, |
| 3276 | input_section, contents, |
| 3277 | symtab_hdr, sym_hashes, |
| 3278 | &r_type, GOT_UNKNOWN, rel, |
| 3279 | relend, h, r_symndx, TRUE)) |
| 3280 | return FALSE; |
| 3281 | |
| 3282 | if (r_type != R_386_TLS_LDM) |
| 3283 | { |
| 3284 | /* LD->LE transition. Change |
| 3285 | leal foo@tlsldm(%ebx) %eax |
| 3286 | call ___tls_get_addr@PLT |
| 3287 | into: |
| 3288 | movl %gs:0, %eax |
| 3289 | nop |
| 3290 | leal 0(%esi,1), %esi |
| 3291 | or change |
| 3292 | leal foo@tlsldm(%reg) %eax |
| 3293 | call *___tls_get_addr@GOT(%reg) |
| 3294 | which may be converted to |
| 3295 | addr32 call ___tls_get_addr |
| 3296 | into: |
| 3297 | movl %gs:0, %eax |
| 3298 | leal 0(%esi), %esi */ |
| 3299 | BFD_ASSERT (r_type == R_386_TLS_LE_32); |
| 3300 | if (*(contents + rel->r_offset + 4) == 0xff |
| 3301 | || *(contents + rel->r_offset + 4) == 0x67) |
| 3302 | memcpy (contents + rel->r_offset - 2, |
| 3303 | "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12); |
| 3304 | else |
| 3305 | memcpy (contents + rel->r_offset - 2, |
| 3306 | "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11); |
| 3307 | /* Skip R_386_PC32/R_386_PLT32. */ |
| 3308 | rel++; |
| 3309 | wrel++; |
| 3310 | continue; |
| 3311 | } |
| 3312 | |
| 3313 | if (htab->elf.sgot == NULL) |
| 3314 | abort (); |
| 3315 | |
| 3316 | off = htab->tls_ld_or_ldm_got.offset; |
| 3317 | if (off & 1) |
| 3318 | off &= ~1; |
| 3319 | else |
| 3320 | { |
| 3321 | Elf_Internal_Rela outrel; |
| 3322 | |
| 3323 | if (htab->elf.srelgot == NULL) |
| 3324 | abort (); |
| 3325 | |
| 3326 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 3327 | + htab->elf.sgot->output_offset + off); |
| 3328 | |
| 3329 | bfd_put_32 (output_bfd, 0, |
| 3330 | htab->elf.sgot->contents + off); |
| 3331 | bfd_put_32 (output_bfd, 0, |
| 3332 | htab->elf.sgot->contents + off + 4); |
| 3333 | outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32); |
| 3334 | elf_append_rel (output_bfd, htab->elf.srelgot, &outrel); |
| 3335 | htab->tls_ld_or_ldm_got.offset |= 1; |
| 3336 | } |
| 3337 | relocation = htab->elf.sgot->output_section->vma |
| 3338 | + htab->elf.sgot->output_offset + off |
| 3339 | - htab->elf.sgotplt->output_section->vma |
| 3340 | - htab->elf.sgotplt->output_offset; |
| 3341 | unresolved_reloc = FALSE; |
| 3342 | break; |
| 3343 | |
| 3344 | case R_386_TLS_LDO_32: |
| 3345 | if (!bfd_link_executable (info) |
| 3346 | || (input_section->flags & SEC_CODE) == 0) |
| 3347 | relocation -= _bfd_x86_elf_dtpoff_base (info); |
| 3348 | else |
| 3349 | /* When converting LDO to LE, we must negate. */ |
| 3350 | relocation = -elf_i386_tpoff (info, relocation); |
| 3351 | break; |
| 3352 | |
| 3353 | case R_386_TLS_LE_32: |
| 3354 | case R_386_TLS_LE: |
| 3355 | if (!bfd_link_executable (info)) |
| 3356 | { |
| 3357 | Elf_Internal_Rela outrel; |
| 3358 | asection *sreloc; |
| 3359 | |
| 3360 | outrel.r_offset = rel->r_offset |
| 3361 | + input_section->output_section->vma |
| 3362 | + input_section->output_offset; |
| 3363 | if (h != NULL && h->dynindx != -1) |
| 3364 | indx = h->dynindx; |
| 3365 | else |
| 3366 | indx = 0; |
| 3367 | if (r_type == R_386_TLS_LE_32) |
| 3368 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32); |
| 3369 | else |
| 3370 | outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF); |
| 3371 | sreloc = elf_section_data (input_section)->sreloc; |
| 3372 | if (sreloc == NULL) |
| 3373 | abort (); |
| 3374 | elf_append_rel (output_bfd, sreloc, &outrel); |
| 3375 | if (indx) |
| 3376 | continue; |
| 3377 | else if (r_type == R_386_TLS_LE_32) |
| 3378 | relocation = _bfd_x86_elf_dtpoff_base (info) - relocation; |
| 3379 | else |
| 3380 | relocation -= _bfd_x86_elf_dtpoff_base (info); |
| 3381 | } |
| 3382 | else if (r_type == R_386_TLS_LE_32) |
| 3383 | relocation = elf_i386_tpoff (info, relocation); |
| 3384 | else |
| 3385 | relocation = -elf_i386_tpoff (info, relocation); |
| 3386 | break; |
| 3387 | |
| 3388 | default: |
| 3389 | break; |
| 3390 | } |
| 3391 | |
| 3392 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 3393 | because such sections are not SEC_ALLOC and thus ld.so will |
| 3394 | not process them. */ |
| 3395 | if (unresolved_reloc |
| 3396 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 3397 | && h->def_dynamic) |
| 3398 | && _bfd_elf_section_offset (output_bfd, info, input_section, |
| 3399 | rel->r_offset) != (bfd_vma) -1) |
| 3400 | { |
| 3401 | _bfd_error_handler |
| 3402 | /* xgettext:c-format */ |
| 3403 | (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"), |
| 3404 | input_bfd, |
| 3405 | input_section, |
| 3406 | (uint64_t) rel->r_offset, |
| 3407 | howto->name, |
| 3408 | h->root.root.string); |
| 3409 | return FALSE; |
| 3410 | } |
| 3411 | |
| 3412 | do_relocation: |
| 3413 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 3414 | contents, rel->r_offset, |
| 3415 | relocation, 0); |
| 3416 | |
| 3417 | check_relocation_error: |
| 3418 | if (r != bfd_reloc_ok) |
| 3419 | { |
| 3420 | const char *name; |
| 3421 | |
| 3422 | if (h != NULL) |
| 3423 | name = h->root.root.string; |
| 3424 | else |
| 3425 | { |
| 3426 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 3427 | symtab_hdr->sh_link, |
| 3428 | sym->st_name); |
| 3429 | if (name == NULL) |
| 3430 | return FALSE; |
| 3431 | if (*name == '\0') |
| 3432 | name = bfd_section_name (input_bfd, sec); |
| 3433 | } |
| 3434 | |
| 3435 | if (r == bfd_reloc_overflow) |
| 3436 | (*info->callbacks->reloc_overflow) |
| 3437 | (info, (h ? &h->root : NULL), name, howto->name, |
| 3438 | (bfd_vma) 0, input_bfd, input_section, rel->r_offset); |
| 3439 | else |
| 3440 | { |
| 3441 | _bfd_error_handler |
| 3442 | /* xgettext:c-format */ |
| 3443 | (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"), |
| 3444 | input_bfd, input_section, |
| 3445 | (uint64_t) rel->r_offset, name, (int) r); |
| 3446 | return FALSE; |
| 3447 | } |
| 3448 | } |
| 3449 | |
| 3450 | if (wrel != rel) |
| 3451 | *wrel = *rel; |
| 3452 | } |
| 3453 | |
| 3454 | if (wrel != rel) |
| 3455 | { |
| 3456 | Elf_Internal_Shdr *rel_hdr; |
| 3457 | size_t deleted = rel - wrel; |
| 3458 | |
| 3459 | rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section); |
| 3460 | rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; |
| 3461 | if (rel_hdr->sh_size == 0) |
| 3462 | { |
| 3463 | /* It is too late to remove an empty reloc section. Leave |
| 3464 | one NONE reloc. |
| 3465 | ??? What is wrong with an empty section??? */ |
| 3466 | rel_hdr->sh_size = rel_hdr->sh_entsize; |
| 3467 | deleted -= 1; |
| 3468 | } |
| 3469 | rel_hdr = _bfd_elf_single_rel_hdr (input_section); |
| 3470 | rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted; |
| 3471 | input_section->reloc_count -= deleted; |
| 3472 | } |
| 3473 | |
| 3474 | return TRUE; |
| 3475 | } |
| 3476 | |
| 3477 | /* Finish up dynamic symbol handling. We set the contents of various |
| 3478 | dynamic sections here. */ |
| 3479 | |
| 3480 | static bfd_boolean |
| 3481 | elf_i386_finish_dynamic_symbol (bfd *output_bfd, |
| 3482 | struct bfd_link_info *info, |
| 3483 | struct elf_link_hash_entry *h, |
| 3484 | Elf_Internal_Sym *sym) |
| 3485 | { |
| 3486 | struct elf_x86_link_hash_table *htab; |
| 3487 | unsigned plt_entry_size; |
| 3488 | struct elf_x86_link_hash_entry *eh; |
| 3489 | bfd_boolean local_undefweak; |
| 3490 | bfd_boolean use_plt_second; |
| 3491 | |
| 3492 | htab = elf_x86_hash_table (info, I386_ELF_DATA); |
| 3493 | if (htab == NULL) |
| 3494 | return FALSE; |
| 3495 | |
| 3496 | plt_entry_size = htab->plt.plt_entry_size; |
| 3497 | |
| 3498 | /* Use the second PLT section only if there is .plt section. */ |
| 3499 | use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL; |
| 3500 | |
| 3501 | eh = (struct elf_x86_link_hash_entry *) h; |
| 3502 | if (eh->no_finish_dynamic_symbol) |
| 3503 | abort (); |
| 3504 | |
| 3505 | /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for |
| 3506 | resolved undefined weak symbols in executable so that their |
| 3507 | references have value 0 at run-time. */ |
| 3508 | local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); |
| 3509 | |
| 3510 | if (h->plt.offset != (bfd_vma) -1) |
| 3511 | { |
| 3512 | bfd_vma plt_index, plt_offset; |
| 3513 | bfd_vma got_offset; |
| 3514 | Elf_Internal_Rela rel; |
| 3515 | bfd_byte *loc; |
| 3516 | asection *plt, *resolved_plt, *gotplt, *relplt; |
| 3517 | |
| 3518 | /* When building a static executable, use .iplt, .igot.plt and |
| 3519 | .rel.iplt sections for STT_GNU_IFUNC symbols. */ |
| 3520 | if (htab->elf.splt != NULL) |
| 3521 | { |
| 3522 | plt = htab->elf.splt; |
| 3523 | gotplt = htab->elf.sgotplt; |
| 3524 | relplt = htab->elf.srelplt; |
| 3525 | } |
| 3526 | else |
| 3527 | { |
| 3528 | plt = htab->elf.iplt; |
| 3529 | gotplt = htab->elf.igotplt; |
| 3530 | relplt = htab->elf.irelplt; |
| 3531 | } |
| 3532 | |
| 3533 | VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak) |
| 3534 | |
| 3535 | /* Get the index in the procedure linkage table which |
| 3536 | corresponds to this symbol. This is the index of this symbol |
| 3537 | in all the symbols for which we are making plt entries. The |
| 3538 | first entry in the procedure linkage table is reserved. |
| 3539 | |
| 3540 | Get the offset into the .got table of the entry that |
| 3541 | corresponds to this function. Each .got entry is 4 bytes. |
| 3542 | The first three are reserved. |
| 3543 | |
| 3544 | For static executables, we don't reserve anything. */ |
| 3545 | |
| 3546 | if (plt == htab->elf.splt) |
| 3547 | { |
| 3548 | got_offset = (h->plt.offset / plt_entry_size |
| 3549 | - htab->plt.has_plt0); |
| 3550 | got_offset = (got_offset + 3) * 4; |
| 3551 | } |
| 3552 | else |
| 3553 | { |
| 3554 | got_offset = h->plt.offset / plt_entry_size; |
| 3555 | got_offset = got_offset * 4; |
| 3556 | } |
| 3557 | |
| 3558 | /* Fill in the entry in the procedure linkage table and update |
| 3559 | the first slot. */ |
| 3560 | memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry, |
| 3561 | plt_entry_size); |
| 3562 | |
| 3563 | if (use_plt_second) |
| 3564 | { |
| 3565 | const bfd_byte *plt_entry; |
| 3566 | if (bfd_link_pic (info)) |
| 3567 | plt_entry = htab->non_lazy_plt->pic_plt_entry; |
| 3568 | else |
| 3569 | plt_entry = htab->non_lazy_plt->plt_entry; |
| 3570 | memcpy (htab->plt_second->contents + eh->plt_second.offset, |
| 3571 | plt_entry, htab->non_lazy_plt->plt_entry_size); |
| 3572 | |
| 3573 | resolved_plt = htab->plt_second; |
| 3574 | plt_offset = eh->plt_second.offset; |
| 3575 | } |
| 3576 | else |
| 3577 | { |
| 3578 | resolved_plt = plt; |
| 3579 | plt_offset = h->plt.offset; |
| 3580 | } |
| 3581 | |
| 3582 | if (! bfd_link_pic (info)) |
| 3583 | { |
| 3584 | bfd_put_32 (output_bfd, |
| 3585 | (gotplt->output_section->vma |
| 3586 | + gotplt->output_offset |
| 3587 | + got_offset), |
| 3588 | resolved_plt->contents + plt_offset |
| 3589 | + htab->plt.plt_got_offset); |
| 3590 | |
| 3591 | if (htab->target_os == is_vxworks) |
| 3592 | { |
| 3593 | int s, k, reloc_index; |
| 3594 | |
| 3595 | /* Create the R_386_32 relocation referencing the GOT |
| 3596 | for this PLT entry. */ |
| 3597 | |
| 3598 | /* S: Current slot number (zero-based). */ |
| 3599 | s = ((h->plt.offset - htab->plt.plt_entry_size) |
| 3600 | / htab->plt.plt_entry_size); |
| 3601 | /* K: Number of relocations for PLTResolve. */ |
| 3602 | if (bfd_link_pic (info)) |
| 3603 | k = PLTRESOLVE_RELOCS_SHLIB; |
| 3604 | else |
| 3605 | k = PLTRESOLVE_RELOCS; |
| 3606 | /* Skip the PLTresolve relocations, and the relocations for |
| 3607 | the other PLT slots. */ |
| 3608 | reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS; |
| 3609 | loc = (htab->srelplt2->contents + reloc_index |
| 3610 | * sizeof (Elf32_External_Rel)); |
| 3611 | |
| 3612 | rel.r_offset = (plt->output_section->vma |
| 3613 | + plt->output_offset |
| 3614 | + h->plt.offset + 2), |
| 3615 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32); |
| 3616 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3617 | |
| 3618 | /* Create the R_386_32 relocation referencing the beginning of |
| 3619 | the PLT for this GOT entry. */ |
| 3620 | rel.r_offset = (htab->elf.sgotplt->output_section->vma |
| 3621 | + htab->elf.sgotplt->output_offset |
| 3622 | + got_offset); |
| 3623 | rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32); |
| 3624 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 3625 | loc + sizeof (Elf32_External_Rel)); |
| 3626 | } |
| 3627 | } |
| 3628 | else |
| 3629 | { |
| 3630 | bfd_put_32 (output_bfd, got_offset, |
| 3631 | resolved_plt->contents + plt_offset |
| 3632 | + htab->plt.plt_got_offset); |
| 3633 | } |
| 3634 | |
| 3635 | /* Fill in the entry in the global offset table. Leave the entry |
| 3636 | as zero for undefined weak symbol in PIE. No PLT relocation |
| 3637 | against undefined weak symbol in PIE. */ |
| 3638 | if (!local_undefweak) |
| 3639 | { |
| 3640 | if (htab->plt.has_plt0) |
| 3641 | bfd_put_32 (output_bfd, |
| 3642 | (plt->output_section->vma |
| 3643 | + plt->output_offset |
| 3644 | + h->plt.offset |
| 3645 | + htab->lazy_plt->plt_lazy_offset), |
| 3646 | gotplt->contents + got_offset); |
| 3647 | |
| 3648 | /* Fill in the entry in the .rel.plt section. */ |
| 3649 | rel.r_offset = (gotplt->output_section->vma |
| 3650 | + gotplt->output_offset |
| 3651 | + got_offset); |
| 3652 | if (PLT_LOCAL_IFUNC_P (info, h)) |
| 3653 | { |
| 3654 | info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), |
| 3655 | h->root.root.string, |
| 3656 | h->root.u.def.section->owner); |
| 3657 | |
| 3658 | /* If an STT_GNU_IFUNC symbol is locally defined, generate |
| 3659 | R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend |
| 3660 | in the .got.plt section. */ |
| 3661 | bfd_put_32 (output_bfd, |
| 3662 | (h->root.u.def.value |
| 3663 | + h->root.u.def.section->output_section->vma |
| 3664 | + h->root.u.def.section->output_offset), |
| 3665 | gotplt->contents + got_offset); |
| 3666 | rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); |
| 3667 | /* R_386_IRELATIVE comes last. */ |
| 3668 | plt_index = htab->next_irelative_index--; |
| 3669 | } |
| 3670 | else |
| 3671 | { |
| 3672 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); |
| 3673 | plt_index = htab->next_jump_slot_index++; |
| 3674 | } |
| 3675 | |
| 3676 | loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel); |
| 3677 | bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); |
| 3678 | |
| 3679 | /* Don't fill the second and third slots in PLT entry for |
| 3680 | static executables nor without PLT0. */ |
| 3681 | if (plt == htab->elf.splt && htab->plt.has_plt0) |
| 3682 | { |
| 3683 | bfd_put_32 (output_bfd, |
| 3684 | plt_index * sizeof (Elf32_External_Rel), |
| 3685 | plt->contents + h->plt.offset |
| 3686 | + htab->lazy_plt->plt_reloc_offset); |
| 3687 | bfd_put_32 (output_bfd, |
| 3688 | - (h->plt.offset |
| 3689 | + htab->lazy_plt->plt_plt_offset + 4), |
| 3690 | (plt->contents + h->plt.offset |
| 3691 | + htab->lazy_plt->plt_plt_offset)); |
| 3692 | } |
| 3693 | } |
| 3694 | } |
| 3695 | else if (eh->plt_got.offset != (bfd_vma) -1) |
| 3696 | { |
| 3697 | bfd_vma got_offset, plt_offset; |
| 3698 | asection *plt, *got, *gotplt; |
| 3699 | const bfd_byte *got_plt_entry; |
| 3700 | |
| 3701 | /* Set the entry in the GOT procedure linkage table. */ |
| 3702 | plt = htab->plt_got; |
| 3703 | got = htab->elf.sgot; |
| 3704 | gotplt = htab->elf.sgotplt; |
| 3705 | got_offset = h->got.offset; |
| 3706 | |
| 3707 | if (got_offset == (bfd_vma) -1 |
| 3708 | || plt == NULL |
| 3709 | || got == NULL |
| 3710 | || gotplt == NULL) |
| 3711 | abort (); |
| 3712 | |
| 3713 | /* Fill in the entry in the GOT procedure linkage table. */ |
| 3714 | if (! bfd_link_pic (info)) |
| 3715 | { |
| 3716 | got_plt_entry = htab->non_lazy_plt->plt_entry; |
| 3717 | got_offset += got->output_section->vma + got->output_offset; |
| 3718 | } |
| 3719 | else |
| 3720 | { |
| 3721 | got_plt_entry = htab->non_lazy_plt->pic_plt_entry; |
| 3722 | got_offset += (got->output_section->vma |
| 3723 | + got->output_offset |
| 3724 | - gotplt->output_section->vma |
| 3725 | - gotplt->output_offset); |
| 3726 | } |
| 3727 | |
| 3728 | plt_offset = eh->plt_got.offset; |
| 3729 | memcpy (plt->contents + plt_offset, got_plt_entry, |
| 3730 | htab->non_lazy_plt->plt_entry_size); |
| 3731 | bfd_put_32 (output_bfd, got_offset, |
| 3732 | (plt->contents + plt_offset |
| 3733 | + htab->non_lazy_plt->plt_got_offset)); |
| 3734 | } |
| 3735 | |
| 3736 | if (!local_undefweak |
| 3737 | && !h->def_regular |
| 3738 | && (h->plt.offset != (bfd_vma) -1 |
| 3739 | || eh->plt_got.offset != (bfd_vma) -1)) |
| 3740 | { |
| 3741 | /* Mark the symbol as undefined, rather than as defined in |
| 3742 | the .plt section. Leave the value if there were any |
| 3743 | relocations where pointer equality matters (this is a clue |
| 3744 | for the dynamic linker, to make function pointer |
| 3745 | comparisons work between an application and shared |
| 3746 | library), otherwise set it to zero. If a function is only |
| 3747 | called from a binary, there is no need to slow down |
| 3748 | shared libraries because of that. */ |
| 3749 | sym->st_shndx = SHN_UNDEF; |
| 3750 | if (!h->pointer_equality_needed) |
| 3751 | sym->st_value = 0; |
| 3752 | } |
| 3753 | |
| 3754 | _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym); |
| 3755 | |
| 3756 | /* Don't generate dynamic GOT relocation against undefined weak |
| 3757 | symbol in executable. */ |
| 3758 | if (h->got.offset != (bfd_vma) -1 |
| 3759 | && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type) |
| 3760 | && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0 |
| 3761 | && !local_undefweak) |
| 3762 | { |
| 3763 | Elf_Internal_Rela rel; |
| 3764 | asection *relgot = htab->elf.srelgot; |
| 3765 | |
| 3766 | /* This symbol has an entry in the global offset table. Set it |
| 3767 | up. */ |
| 3768 | |
| 3769 | if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) |
| 3770 | abort (); |
| 3771 | |
| 3772 | rel.r_offset = (htab->elf.sgot->output_section->vma |
| 3773 | + htab->elf.sgot->output_offset |
| 3774 | + (h->got.offset & ~(bfd_vma) 1)); |
| 3775 | |
| 3776 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 3777 | symbol is defined locally or was forced to be local because |
| 3778 | of a version file, we just want to emit a RELATIVE reloc. |
| 3779 | The entry in the global offset table will already have been |
| 3780 | initialized in the relocate_section function. */ |
| 3781 | if (h->def_regular |
| 3782 | && h->type == STT_GNU_IFUNC) |
| 3783 | { |
| 3784 | if (h->plt.offset == (bfd_vma) -1) |
| 3785 | { |
| 3786 | /* STT_GNU_IFUNC is referenced without PLT. */ |
| 3787 | if (htab->elf.splt == NULL) |
| 3788 | { |
| 3789 | /* use .rel[a].iplt section to store .got relocations |
| 3790 | in static executable. */ |
| 3791 | relgot = htab->elf.irelplt; |
| 3792 | } |
| 3793 | if (SYMBOL_REFERENCES_LOCAL_P (info, h)) |
| 3794 | { |
| 3795 | info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"), |
| 3796 | h->root.root.string, |
| 3797 | h->root.u.def.section->owner); |
| 3798 | |
| 3799 | bfd_put_32 (output_bfd, |
| 3800 | (h->root.u.def.value |
| 3801 | + h->root.u.def.section->output_section->vma |
| 3802 | + h->root.u.def.section->output_offset), |
| 3803 | htab->elf.sgot->contents + h->got.offset); |
| 3804 | rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); |
| 3805 | } |
| 3806 | else |
| 3807 | goto do_glob_dat; |
| 3808 | } |
| 3809 | else if (bfd_link_pic (info)) |
| 3810 | { |
| 3811 | /* Generate R_386_GLOB_DAT. */ |
| 3812 | goto do_glob_dat; |
| 3813 | } |
| 3814 | else |
| 3815 | { |
| 3816 | asection *plt; |
| 3817 | bfd_vma plt_offset; |
| 3818 | |
| 3819 | if (!h->pointer_equality_needed) |
| 3820 | abort (); |
| 3821 | |
| 3822 | /* For non-shared object, we can't use .got.plt, which |
| 3823 | contains the real function addres if we need pointer |
| 3824 | equality. We load the GOT entry with the PLT entry. */ |
| 3825 | if (htab->plt_second != NULL) |
| 3826 | { |
| 3827 | plt = htab->plt_second; |
| 3828 | plt_offset = eh->plt_second.offset; |
| 3829 | } |
| 3830 | else |
| 3831 | { |
| 3832 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; |
| 3833 | plt_offset = h->plt.offset; |
| 3834 | } |
| 3835 | bfd_put_32 (output_bfd, |
| 3836 | (plt->output_section->vma |
| 3837 | + plt->output_offset + plt_offset), |
| 3838 | htab->elf.sgot->contents + h->got.offset); |
| 3839 | return TRUE; |
| 3840 | } |
| 3841 | } |
| 3842 | else if (bfd_link_pic (info) |
| 3843 | && SYMBOL_REFERENCES_LOCAL_P (info, h)) |
| 3844 | { |
| 3845 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 3846 | rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); |
| 3847 | } |
| 3848 | else |
| 3849 | { |
| 3850 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 3851 | do_glob_dat: |
| 3852 | bfd_put_32 (output_bfd, (bfd_vma) 0, |
| 3853 | htab->elf.sgot->contents + h->got.offset); |
| 3854 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT); |
| 3855 | } |
| 3856 | |
| 3857 | elf_append_rel (output_bfd, relgot, &rel); |
| 3858 | } |
| 3859 | |
| 3860 | if (h->needs_copy) |
| 3861 | { |
| 3862 | Elf_Internal_Rela rel; |
| 3863 | asection *s; |
| 3864 | |
| 3865 | /* This symbol needs a copy reloc. Set it up. */ |
| 3866 | VERIFY_COPY_RELOC (h, htab) |
| 3867 | |
| 3868 | rel.r_offset = (h->root.u.def.value |
| 3869 | + h->root.u.def.section->output_section->vma |
| 3870 | + h->root.u.def.section->output_offset); |
| 3871 | rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY); |
| 3872 | if (h->root.u.def.section == htab->elf.sdynrelro) |
| 3873 | s = htab->elf.sreldynrelro; |
| 3874 | else |
| 3875 | s = htab->elf.srelbss; |
| 3876 | elf_append_rel (output_bfd, s, &rel); |
| 3877 | } |
| 3878 | |
| 3879 | return TRUE; |
| 3880 | } |
| 3881 | |
| 3882 | /* Finish up local dynamic symbol handling. We set the contents of |
| 3883 | various dynamic sections here. */ |
| 3884 | |
| 3885 | static bfd_boolean |
| 3886 | elf_i386_finish_local_dynamic_symbol (void **slot, void *inf) |
| 3887 | { |
| 3888 | struct elf_link_hash_entry *h |
| 3889 | = (struct elf_link_hash_entry *) *slot; |
| 3890 | struct bfd_link_info *info |
| 3891 | = (struct bfd_link_info *) inf; |
| 3892 | |
| 3893 | return elf_i386_finish_dynamic_symbol (info->output_bfd, info, |
| 3894 | h, NULL); |
| 3895 | } |
| 3896 | |
| 3897 | /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry |
| 3898 | here since undefined weak symbol may not be dynamic and may not be |
| 3899 | called for elf_i386_finish_dynamic_symbol. */ |
| 3900 | |
| 3901 | static bfd_boolean |
| 3902 | elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh, |
| 3903 | void *inf) |
| 3904 | { |
| 3905 | struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh; |
| 3906 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 3907 | |
| 3908 | if (h->root.type != bfd_link_hash_undefweak |
| 3909 | || h->dynindx != -1) |
| 3910 | return TRUE; |
| 3911 | |
| 3912 | return elf_i386_finish_dynamic_symbol (info->output_bfd, |
| 3913 | info, h, NULL); |
| 3914 | } |
| 3915 | |
| 3916 | /* Used to decide how to sort relocs in an optimal manner for the |
| 3917 | dynamic linker, before writing them out. */ |
| 3918 | |
| 3919 | static enum elf_reloc_type_class |
| 3920 | elf_i386_reloc_type_class (const struct bfd_link_info *info, |
| 3921 | const asection *rel_sec ATTRIBUTE_UNUSED, |
| 3922 | const Elf_Internal_Rela *rela) |
| 3923 | { |
| 3924 | bfd *abfd = info->output_bfd; |
| 3925 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 3926 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 3927 | |
| 3928 | if (htab->dynsym != NULL |
| 3929 | && htab->dynsym->contents != NULL) |
| 3930 | { |
| 3931 | /* Check relocation against STT_GNU_IFUNC symbol if there are |
| 3932 | dynamic symbols. */ |
| 3933 | unsigned long r_symndx = ELF32_R_SYM (rela->r_info); |
| 3934 | if (r_symndx != STN_UNDEF) |
| 3935 | { |
| 3936 | Elf_Internal_Sym sym; |
| 3937 | if (!bed->s->swap_symbol_in (abfd, |
| 3938 | (htab->dynsym->contents |
| 3939 | + r_symndx * sizeof (Elf32_External_Sym)), |
| 3940 | 0, &sym)) |
| 3941 | abort (); |
| 3942 | |
| 3943 | if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC) |
| 3944 | return reloc_class_ifunc; |
| 3945 | } |
| 3946 | } |
| 3947 | |
| 3948 | switch (ELF32_R_TYPE (rela->r_info)) |
| 3949 | { |
| 3950 | case R_386_IRELATIVE: |
| 3951 | return reloc_class_ifunc; |
| 3952 | case R_386_RELATIVE: |
| 3953 | return reloc_class_relative; |
| 3954 | case R_386_JUMP_SLOT: |
| 3955 | return reloc_class_plt; |
| 3956 | case R_386_COPY: |
| 3957 | return reloc_class_copy; |
| 3958 | default: |
| 3959 | return reloc_class_normal; |
| 3960 | } |
| 3961 | } |
| 3962 | |
| 3963 | /* Finish up the dynamic sections. */ |
| 3964 | |
| 3965 | static bfd_boolean |
| 3966 | elf_i386_finish_dynamic_sections (bfd *output_bfd, |
| 3967 | struct bfd_link_info *info) |
| 3968 | { |
| 3969 | struct elf_x86_link_hash_table *htab; |
| 3970 | |
| 3971 | htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info); |
| 3972 | if (htab == NULL) |
| 3973 | return FALSE; |
| 3974 | |
| 3975 | if (!htab->elf.dynamic_sections_created) |
| 3976 | return TRUE; |
| 3977 | |
| 3978 | if (htab->elf.splt && htab->elf.splt->size > 0) |
| 3979 | { |
| 3980 | /* UnixWare sets the entsize of .plt to 4, although that doesn't |
| 3981 | really seem like the right value. */ |
| 3982 | elf_section_data (htab->elf.splt->output_section) |
| 3983 | ->this_hdr.sh_entsize = 4; |
| 3984 | |
| 3985 | if (htab->plt.has_plt0) |
| 3986 | { |
| 3987 | /* Fill in the special first entry in the procedure linkage |
| 3988 | table. */ |
| 3989 | memcpy (htab->elf.splt->contents, htab->plt.plt0_entry, |
| 3990 | htab->lazy_plt->plt0_entry_size); |
| 3991 | memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size, |
| 3992 | htab->plt0_pad_byte, |
| 3993 | htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size); |
| 3994 | if (!bfd_link_pic (info)) |
| 3995 | { |
| 3996 | bfd_put_32 (output_bfd, |
| 3997 | (htab->elf.sgotplt->output_section->vma |
| 3998 | + htab->elf.sgotplt->output_offset |
| 3999 | + 4), |
| 4000 | htab->elf.splt->contents |
| 4001 | + htab->lazy_plt->plt0_got1_offset); |
| 4002 | bfd_put_32 (output_bfd, |
| 4003 | (htab->elf.sgotplt->output_section->vma |
| 4004 | + htab->elf.sgotplt->output_offset |
| 4005 | + 8), |
| 4006 | htab->elf.splt->contents |
| 4007 | + htab->lazy_plt->plt0_got2_offset); |
| 4008 | |
| 4009 | if (htab->target_os == is_vxworks) |
| 4010 | { |
| 4011 | Elf_Internal_Rela rel; |
| 4012 | int num_plts = (htab->elf.splt->size |
| 4013 | / htab->plt.plt_entry_size) - 1; |
| 4014 | unsigned char *p; |
| 4015 | asection *srelplt2 = htab->srelplt2; |
| 4016 | |
| 4017 | /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ |
| 4018 | + 4. On IA32 we use REL relocations so the |
| 4019 | addend goes in the PLT directly. */ |
| 4020 | rel.r_offset = (htab->elf.splt->output_section->vma |
| 4021 | + htab->elf.splt->output_offset |
| 4022 | + htab->lazy_plt->plt0_got1_offset); |
| 4023 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, |
| 4024 | R_386_32); |
| 4025 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 4026 | srelplt2->contents); |
| 4027 | /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ |
| 4028 | + 8. */ |
| 4029 | rel.r_offset = (htab->elf.splt->output_section->vma |
| 4030 | + htab->elf.splt->output_offset |
| 4031 | + htab->lazy_plt->plt0_got2_offset); |
| 4032 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, |
| 4033 | R_386_32); |
| 4034 | bfd_elf32_swap_reloc_out (output_bfd, &rel, |
| 4035 | srelplt2->contents + |
| 4036 | sizeof (Elf32_External_Rel)); |
| 4037 | /* Correct the .rel.plt.unloaded relocations. */ |
| 4038 | p = srelplt2->contents; |
| 4039 | if (bfd_link_pic (info)) |
| 4040 | p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel); |
| 4041 | else |
| 4042 | p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel); |
| 4043 | |
| 4044 | for (; num_plts; num_plts--) |
| 4045 | { |
| 4046 | bfd_elf32_swap_reloc_in (output_bfd, p, &rel); |
| 4047 | rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, |
| 4048 | R_386_32); |
| 4049 | bfd_elf32_swap_reloc_out (output_bfd, &rel, p); |
| 4050 | p += sizeof (Elf32_External_Rel); |
| 4051 | |
| 4052 | bfd_elf32_swap_reloc_in (output_bfd, p, &rel); |
| 4053 | rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, |
| 4054 | R_386_32); |
| 4055 | bfd_elf32_swap_reloc_out (output_bfd, &rel, p); |
| 4056 | p += sizeof (Elf32_External_Rel); |
| 4057 | } |
| 4058 | } |
| 4059 | } |
| 4060 | } |
| 4061 | } |
| 4062 | |
| 4063 | /* Fill PLT entries for undefined weak symbols in PIE. */ |
| 4064 | if (bfd_link_pie (info)) |
| 4065 | bfd_hash_traverse (&info->hash->table, |
| 4066 | elf_i386_pie_finish_undefweak_symbol, |
| 4067 | info); |
| 4068 | |
| 4069 | return TRUE; |
| 4070 | } |
| 4071 | |
| 4072 | /* Fill PLT/GOT entries and allocate dynamic relocations for local |
| 4073 | STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table. |
| 4074 | It has to be done before elf_link_sort_relocs is called so that |
| 4075 | dynamic relocations are properly sorted. */ |
| 4076 | |
| 4077 | static bfd_boolean |
| 4078 | elf_i386_output_arch_local_syms |
| 4079 | (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 4080 | struct bfd_link_info *info, |
| 4081 | void *flaginfo ATTRIBUTE_UNUSED, |
| 4082 | int (*func) (void *, const char *, |
| 4083 | Elf_Internal_Sym *, |
| 4084 | asection *, |
| 4085 | struct elf_link_hash_entry *) ATTRIBUTE_UNUSED) |
| 4086 | { |
| 4087 | struct elf_x86_link_hash_table *htab |
| 4088 | = elf_x86_hash_table (info, I386_ELF_DATA); |
| 4089 | if (htab == NULL) |
| 4090 | return FALSE; |
| 4091 | |
| 4092 | /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ |
| 4093 | htab_traverse (htab->loc_hash_table, |
| 4094 | elf_i386_finish_local_dynamic_symbol, |
| 4095 | info); |
| 4096 | |
| 4097 | return TRUE; |
| 4098 | } |
| 4099 | |
| 4100 | /* Forward declaration. */ |
| 4101 | static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt; |
| 4102 | |
| 4103 | /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all |
| 4104 | dynamic relocations. */ |
| 4105 | |
| 4106 | static long |
| 4107 | elf_i386_get_synthetic_symtab (bfd *abfd, |
| 4108 | long symcount ATTRIBUTE_UNUSED, |
| 4109 | asymbol **syms ATTRIBUTE_UNUSED, |
| 4110 | long dynsymcount, |
| 4111 | asymbol **dynsyms, |
| 4112 | asymbol **ret) |
| 4113 | { |
| 4114 | long count, i, n; |
| 4115 | int j; |
| 4116 | bfd_byte *plt_contents; |
| 4117 | long relsize; |
| 4118 | const struct elf_x86_lazy_plt_layout *lazy_plt; |
| 4119 | const struct elf_x86_non_lazy_plt_layout *non_lazy_plt; |
| 4120 | const struct elf_x86_lazy_plt_layout *lazy_ibt_plt; |
| 4121 | const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt; |
| 4122 | asection *plt; |
| 4123 | bfd_vma got_addr; |
| 4124 | enum elf_x86_plt_type plt_type; |
| 4125 | struct elf_x86_plt plts[] = |
| 4126 | { |
| 4127 | { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 }, |
| 4128 | { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }, |
| 4129 | { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 }, |
| 4130 | { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 } |
| 4131 | }; |
| 4132 | |
| 4133 | *ret = NULL; |
| 4134 | |
| 4135 | if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0) |
| 4136 | return 0; |
| 4137 | |
| 4138 | if (dynsymcount <= 0) |
| 4139 | return 0; |
| 4140 | |
| 4141 | relsize = bfd_get_dynamic_reloc_upper_bound (abfd); |
| 4142 | if (relsize <= 0) |
| 4143 | return -1; |
| 4144 | |
| 4145 | non_lazy_plt = NULL; |
| 4146 | /* Silence GCC 6. */ |
| 4147 | lazy_plt = NULL; |
| 4148 | non_lazy_ibt_plt = NULL; |
| 4149 | lazy_ibt_plt = NULL; |
| 4150 | switch (get_elf_x86_backend_data (abfd)->target_os) |
| 4151 | { |
| 4152 | case is_normal: |
| 4153 | case is_solaris: |
| 4154 | non_lazy_plt = &elf_i386_non_lazy_plt; |
| 4155 | lazy_ibt_plt = &elf_i386_lazy_ibt_plt; |
| 4156 | non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt; |
| 4157 | /* Fall through */ |
| 4158 | case is_vxworks: |
| 4159 | lazy_plt = &elf_i386_lazy_plt; |
| 4160 | break; |
| 4161 | case is_nacl: |
| 4162 | lazy_plt = &elf_i386_nacl_plt; |
| 4163 | break; |
| 4164 | } |
| 4165 | |
| 4166 | got_addr = 0; |
| 4167 | |
| 4168 | count = 0; |
| 4169 | for (j = 0; plts[j].name != NULL; j++) |
| 4170 | { |
| 4171 | plt = bfd_get_section_by_name (abfd, plts[j].name); |
| 4172 | if (plt == NULL || plt->size == 0) |
| 4173 | continue; |
| 4174 | |
| 4175 | /* Get the PLT section contents. */ |
| 4176 | plt_contents = (bfd_byte *) bfd_malloc (plt->size); |
| 4177 | if (plt_contents == NULL) |
| 4178 | break; |
| 4179 | if (!bfd_get_section_contents (abfd, (asection *) plt, |
| 4180 | plt_contents, 0, plt->size)) |
| 4181 | { |
| 4182 | free (plt_contents); |
| 4183 | break; |
| 4184 | } |
| 4185 | |
| 4186 | /* Check what kind of PLT it is. */ |
| 4187 | plt_type = plt_unknown; |
| 4188 | if (plts[j].type == plt_unknown |
| 4189 | && (plt->size >= (lazy_plt->plt0_entry_size |
| 4190 | + lazy_plt->plt_entry_size))) |
| 4191 | { |
| 4192 | /* Match lazy PLT first. */ |
| 4193 | if (memcmp (plt_contents, lazy_plt->plt0_entry, |
| 4194 | lazy_plt->plt0_got1_offset) == 0) |
| 4195 | { |
| 4196 | /* The fist entry in the lazy IBT PLT is the same as the |
| 4197 | normal lazy PLT. */ |
| 4198 | if (lazy_ibt_plt != NULL |
| 4199 | && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size, |
| 4200 | lazy_ibt_plt->plt_entry, |
| 4201 | lazy_ibt_plt->plt_got_offset) == 0)) |
| 4202 | plt_type = plt_lazy | plt_second; |
| 4203 | else |
| 4204 | plt_type = plt_lazy; |
| 4205 | } |
| 4206 | else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry, |
| 4207 | lazy_plt->plt0_got1_offset) == 0) |
| 4208 | { |
| 4209 | /* The fist entry in the PIC lazy IBT PLT is the same as |
| 4210 | the normal PIC lazy PLT. */ |
| 4211 | if (lazy_ibt_plt != NULL |
| 4212 | && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size, |
| 4213 | lazy_ibt_plt->pic_plt_entry, |
| 4214 | lazy_ibt_plt->plt_got_offset) == 0)) |
| 4215 | plt_type = plt_lazy | plt_pic | plt_second; |
| 4216 | else |
| 4217 | plt_type = plt_lazy | plt_pic; |
| 4218 | } |
| 4219 | } |
| 4220 | |
| 4221 | if (non_lazy_plt != NULL |
| 4222 | && (plt_type == plt_unknown || plt_type == plt_non_lazy) |
| 4223 | && plt->size >= non_lazy_plt->plt_entry_size) |
| 4224 | { |
| 4225 | /* Match non-lazy PLT. */ |
| 4226 | if (memcmp (plt_contents, non_lazy_plt->plt_entry, |
| 4227 | non_lazy_plt->plt_got_offset) == 0) |
| 4228 | plt_type = plt_non_lazy; |
| 4229 | else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry, |
| 4230 | non_lazy_plt->plt_got_offset) == 0) |
| 4231 | plt_type = plt_pic; |
| 4232 | } |
| 4233 | |
| 4234 | if ((non_lazy_ibt_plt != NULL) |
| 4235 | && (plt_type == plt_unknown || plt_type == plt_second) |
| 4236 | && plt->size >= non_lazy_ibt_plt->plt_entry_size) |
| 4237 | { |
| 4238 | if (memcmp (plt_contents, |
| 4239 | non_lazy_ibt_plt->plt_entry, |
| 4240 | non_lazy_ibt_plt->plt_got_offset) == 0) |
| 4241 | { |
| 4242 | /* Match IBT PLT. */ |
| 4243 | plt_type = plt_second; |
| 4244 | non_lazy_plt = non_lazy_ibt_plt; |
| 4245 | } |
| 4246 | else if (memcmp (plt_contents, |
| 4247 | non_lazy_ibt_plt->pic_plt_entry, |
| 4248 | non_lazy_ibt_plt->plt_got_offset) == 0) |
| 4249 | { |
| 4250 | /* Match PIC IBT PLT. */ |
| 4251 | plt_type = plt_second | plt_pic; |
| 4252 | non_lazy_plt = non_lazy_ibt_plt; |
| 4253 | } |
| 4254 | } |
| 4255 | |
| 4256 | if (plt_type == plt_unknown) |
| 4257 | { |
| 4258 | free (plt_contents); |
| 4259 | continue; |
| 4260 | } |
| 4261 | |
| 4262 | plts[j].sec = plt; |
| 4263 | plts[j].type = plt_type; |
| 4264 | |
| 4265 | if ((plt_type & plt_lazy)) |
| 4266 | { |
| 4267 | plts[j].plt_got_offset = lazy_plt->plt_got_offset; |
| 4268 | plts[j].plt_entry_size = lazy_plt->plt_entry_size; |
| 4269 | /* Skip PLT0 in lazy PLT. */ |
| 4270 | i = 1; |
| 4271 | } |
| 4272 | else |
| 4273 | { |
| 4274 | plts[j].plt_got_offset = non_lazy_plt->plt_got_offset; |
| 4275 | plts[j].plt_entry_size = non_lazy_plt->plt_entry_size; |
| 4276 | i = 0; |
| 4277 | } |
| 4278 | |
| 4279 | /* Skip lazy PLT when the second PLT is used. */ |
| 4280 | if ((plt_type & (plt_lazy | plt_second)) |
| 4281 | == (plt_lazy | plt_second)) |
| 4282 | plts[j].count = 0; |
| 4283 | else |
| 4284 | { |
| 4285 | n = plt->size / plts[j].plt_entry_size; |
| 4286 | plts[j].count = n; |
| 4287 | count += n - i; |
| 4288 | } |
| 4289 | |
| 4290 | plts[j].contents = plt_contents; |
| 4291 | |
| 4292 | /* The _GLOBAL_OFFSET_TABLE_ address is needed. */ |
| 4293 | if ((plt_type & plt_pic)) |
| 4294 | got_addr = (bfd_vma) -1; |
| 4295 | } |
| 4296 | |
| 4297 | return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize, |
| 4298 | got_addr, plts, dynsyms, |
| 4299 | ret); |
| 4300 | } |
| 4301 | |
| 4302 | /* Set up i386 GNU properties. Return the first relocatable ELF input |
| 4303 | with GNU properties if found. Otherwise, return NULL. */ |
| 4304 | |
| 4305 | static bfd * |
| 4306 | elf_i386_link_setup_gnu_properties (struct bfd_link_info *info) |
| 4307 | { |
| 4308 | struct elf_x86_init_table init_table; |
| 4309 | |
| 4310 | switch (get_elf_x86_backend_data (info->output_bfd)->target_os) |
| 4311 | { |
| 4312 | case is_normal: |
| 4313 | case is_solaris: |
| 4314 | init_table.plt0_pad_byte = 0x0; |
| 4315 | init_table.lazy_plt = &elf_i386_lazy_plt; |
| 4316 | init_table.non_lazy_plt = &elf_i386_non_lazy_plt; |
| 4317 | init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt; |
| 4318 | init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt; |
| 4319 | break; |
| 4320 | case is_vxworks: |
| 4321 | init_table.plt0_pad_byte = 0x90; |
| 4322 | init_table.lazy_plt = &elf_i386_lazy_plt; |
| 4323 | init_table.non_lazy_plt = NULL; |
| 4324 | init_table.lazy_ibt_plt = NULL; |
| 4325 | init_table.non_lazy_ibt_plt = NULL; |
| 4326 | break; |
| 4327 | case is_nacl: |
| 4328 | init_table.plt0_pad_byte = 0x90; |
| 4329 | init_table.lazy_plt = &elf_i386_nacl_plt; |
| 4330 | init_table.non_lazy_plt = NULL; |
| 4331 | init_table.lazy_ibt_plt = NULL; |
| 4332 | init_table.non_lazy_ibt_plt = NULL; |
| 4333 | break; |
| 4334 | } |
| 4335 | |
| 4336 | init_table.r_info = elf32_r_info; |
| 4337 | init_table.r_sym = elf32_r_sym; |
| 4338 | |
| 4339 | return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table); |
| 4340 | } |
| 4341 | |
| 4342 | #define TARGET_LITTLE_SYM i386_elf32_vec |
| 4343 | #define TARGET_LITTLE_NAME "elf32-i386" |
| 4344 | #define ELF_ARCH bfd_arch_i386 |
| 4345 | #define ELF_TARGET_ID I386_ELF_DATA |
| 4346 | #define ELF_MACHINE_CODE EM_386 |
| 4347 | #define ELF_MAXPAGESIZE 0x1000 |
| 4348 | |
| 4349 | #define elf_backend_can_gc_sections 1 |
| 4350 | #define elf_backend_can_refcount 1 |
| 4351 | #define elf_backend_want_got_plt 1 |
| 4352 | #define elf_backend_plt_readonly 1 |
| 4353 | #define elf_backend_want_plt_sym 0 |
| 4354 | #define elf_backend_got_header_size 12 |
| 4355 | #define elf_backend_plt_alignment 4 |
| 4356 | #define elf_backend_dtrel_excludes_plt 1 |
| 4357 | #define elf_backend_extern_protected_data 1 |
| 4358 | #define elf_backend_caches_rawsize 1 |
| 4359 | #define elf_backend_want_dynrelro 1 |
| 4360 | |
| 4361 | /* Support RELA for objdump of prelink objects. */ |
| 4362 | #define elf_info_to_howto elf_i386_info_to_howto_rel |
| 4363 | #define elf_info_to_howto_rel elf_i386_info_to_howto_rel |
| 4364 | |
| 4365 | #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name |
| 4366 | #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup |
| 4367 | #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup |
| 4368 | #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab |
| 4369 | |
| 4370 | #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible |
| 4371 | #define elf_backend_check_relocs elf_i386_check_relocs |
| 4372 | #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections |
| 4373 | #define elf_backend_fake_sections elf_i386_fake_sections |
| 4374 | #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections |
| 4375 | #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol |
| 4376 | #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms |
| 4377 | #define elf_backend_grok_prstatus elf_i386_grok_prstatus |
| 4378 | #define elf_backend_grok_psinfo elf_i386_grok_psinfo |
| 4379 | #define elf_backend_reloc_type_class elf_i386_reloc_type_class |
| 4380 | #define elf_backend_relocate_section elf_i386_relocate_section |
| 4381 | #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties |
| 4382 | #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol |
| 4383 | |
| 4384 | #define elf_backend_linux_prpsinfo32_ugid16 TRUE |
| 4385 | |
| 4386 | #define elf32_bed elf32_i386_bed |
| 4387 | |
| 4388 | #include "elf32-target.h" |
| 4389 | |
| 4390 | /* FreeBSD support. */ |
| 4391 | |
| 4392 | #undef TARGET_LITTLE_SYM |
| 4393 | #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec |
| 4394 | #undef TARGET_LITTLE_NAME |
| 4395 | #define TARGET_LITTLE_NAME "elf32-i386-freebsd" |
| 4396 | #undef ELF_OSABI |
| 4397 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 4398 | |
| 4399 | /* The kernel recognizes executables as valid only if they carry a |
| 4400 | "FreeBSD" label in the ELF header. So we put this label on all |
| 4401 | executables and (for simplicity) also all other object files. */ |
| 4402 | |
| 4403 | static void |
| 4404 | elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info) |
| 4405 | { |
| 4406 | _bfd_elf_post_process_headers (abfd, info); |
| 4407 | |
| 4408 | #ifdef OLD_FREEBSD_ABI_LABEL |
| 4409 | { |
| 4410 | /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ |
| 4411 | Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd); |
| 4412 | memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); |
| 4413 | } |
| 4414 | #endif |
| 4415 | } |
| 4416 | |
| 4417 | #undef elf_backend_post_process_headers |
| 4418 | #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers |
| 4419 | #undef elf32_bed |
| 4420 | #define elf32_bed elf32_i386_fbsd_bed |
| 4421 | |
| 4422 | #undef elf_backend_add_symbol_hook |
| 4423 | |
| 4424 | #include "elf32-target.h" |
| 4425 | |
| 4426 | /* Solaris 2. */ |
| 4427 | |
| 4428 | #undef TARGET_LITTLE_SYM |
| 4429 | #define TARGET_LITTLE_SYM i386_elf32_sol2_vec |
| 4430 | #undef TARGET_LITTLE_NAME |
| 4431 | #define TARGET_LITTLE_NAME "elf32-i386-sol2" |
| 4432 | |
| 4433 | static const struct elf_x86_backend_data elf_i386_solaris_arch_bed = |
| 4434 | { |
| 4435 | is_solaris /* os */ |
| 4436 | }; |
| 4437 | |
| 4438 | #undef elf_backend_arch_data |
| 4439 | #define elf_backend_arch_data &elf_i386_solaris_arch_bed |
| 4440 | |
| 4441 | #undef elf_backend_post_process_headers |
| 4442 | |
| 4443 | /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE |
| 4444 | objects won't be recognized. */ |
| 4445 | #undef ELF_OSABI |
| 4446 | |
| 4447 | #undef elf32_bed |
| 4448 | #define elf32_bed elf32_i386_sol2_bed |
| 4449 | |
| 4450 | /* The 32-bit static TLS arena size is rounded to the nearest 8-byte |
| 4451 | boundary. */ |
| 4452 | #undef elf_backend_static_tls_alignment |
| 4453 | #define elf_backend_static_tls_alignment 8 |
| 4454 | |
| 4455 | /* The Solaris 2 ABI requires a plt symbol on all platforms. |
| 4456 | |
| 4457 | Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output |
| 4458 | File, p.63. */ |
| 4459 | #undef elf_backend_want_plt_sym |
| 4460 | #define elf_backend_want_plt_sym 1 |
| 4461 | |
| 4462 | #undef elf_backend_strtab_flags |
| 4463 | #define elf_backend_strtab_flags SHF_STRINGS |
| 4464 | |
| 4465 | /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which |
| 4466 | has a type >= SHT_LOOS. Returns TRUE if these fields were initialised |
| 4467 | FALSE otherwise. ISECTION is the best guess matching section from the |
| 4468 | input bfd IBFD, but it might be NULL. */ |
| 4469 | |
| 4470 | static bfd_boolean |
| 4471 | elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED, |
| 4472 | bfd *obfd ATTRIBUTE_UNUSED, |
| 4473 | const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED, |
| 4474 | Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED) |
| 4475 | { |
| 4476 | /* PR 19938: FIXME: Need to add code for setting the sh_info |
| 4477 | and sh_link fields of Solaris specific section types. */ |
| 4478 | return FALSE; |
| 4479 | |
| 4480 | /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13, |
| 4481 | Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation: |
| 4482 | |
| 4483 | http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc |
| 4484 | |
| 4485 | The following values should be set: |
| 4486 | |
| 4487 | Type Link Info |
| 4488 | ----------------------------------------------------------------------------- |
| 4489 | SHT_SUNW_ancillary The section header index of 0 |
| 4490 | [0x6fffffee] the associated string table. |
| 4491 | |
| 4492 | SHT_SUNW_capinfo The section header index of For a dynamic object, the |
| 4493 | [0x6ffffff0] the associated symbol table. section header index of |
| 4494 | the associated |
| 4495 | SHT_SUNW_capchain table, |
| 4496 | otherwise 0. |
| 4497 | |
| 4498 | SHT_SUNW_symsort The section header index of 0 |
| 4499 | [0x6ffffff1] the associated symbol table. |
| 4500 | |
| 4501 | SHT_SUNW_tlssort The section header index of 0 |
| 4502 | [0x6ffffff2] the associated symbol table. |
| 4503 | |
| 4504 | SHT_SUNW_LDYNSYM The section header index of One greater than the |
| 4505 | [0x6ffffff3] the associated string table. symbol table index of the |
| 4506 | This index is the same string last local symbol, |
| 4507 | table used by the SHT_DYNSYM STB_LOCAL. Since |
| 4508 | section. SHT_SUNW_LDYNSYM only |
| 4509 | contains local symbols, |
| 4510 | sh_info is equivalent to |
| 4511 | the number of symbols in |
| 4512 | the table. |
| 4513 | |
| 4514 | SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer |
| 4515 | [0x6ffffff5] the section header index of to named strings, the |
| 4516 | the associated section header index of |
| 4517 | SHT_SUNW_capinfo table, the associated string |
| 4518 | otherwise 0. table, otherwise 0. |
| 4519 | |
| 4520 | SHT_SUNW_move The section header index of 0 |
| 4521 | [0x6ffffffa] the associated symbol table. |
| 4522 | |
| 4523 | SHT_SUNW_COMDAT 0 0 |
| 4524 | [0x6ffffffb] |
| 4525 | |
| 4526 | SHT_SUNW_syminfo The section header index of The section header index |
| 4527 | [0x6ffffffc] the associated symbol table. of the associated |
| 4528 | .dynamic section. |
| 4529 | |
| 4530 | SHT_SUNW_verdef The section header index of The number of version |
| 4531 | [0x6ffffffd] the associated string table. definitions within the |
| 4532 | section. |
| 4533 | |
| 4534 | SHT_SUNW_verneed The section header index of The number of version |
| 4535 | [0x6ffffffe] the associated string table. dependencies within the |
| 4536 | section. |
| 4537 | |
| 4538 | SHT_SUNW_versym The section header index of 0 |
| 4539 | [0x6fffffff] the associated symbol table. */ |
| 4540 | } |
| 4541 | |
| 4542 | #undef elf_backend_copy_special_section_fields |
| 4543 | #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields |
| 4544 | |
| 4545 | #include "elf32-target.h" |
| 4546 | |
| 4547 | /* Intel MCU support. */ |
| 4548 | |
| 4549 | static bfd_boolean |
| 4550 | elf32_iamcu_elf_object_p (bfd *abfd) |
| 4551 | { |
| 4552 | /* Set the right machine number for an IAMCU elf32 file. */ |
| 4553 | bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu); |
| 4554 | return TRUE; |
| 4555 | } |
| 4556 | |
| 4557 | #undef TARGET_LITTLE_SYM |
| 4558 | #define TARGET_LITTLE_SYM iamcu_elf32_vec |
| 4559 | #undef TARGET_LITTLE_NAME |
| 4560 | #define TARGET_LITTLE_NAME "elf32-iamcu" |
| 4561 | #undef ELF_ARCH |
| 4562 | #define ELF_ARCH bfd_arch_iamcu |
| 4563 | |
| 4564 | #undef ELF_MACHINE_CODE |
| 4565 | #define ELF_MACHINE_CODE EM_IAMCU |
| 4566 | |
| 4567 | #undef elf_backend_arch_data |
| 4568 | #define elf_backend_arch_data &elf_i386_arch_bed |
| 4569 | |
| 4570 | #undef ELF_OSABI |
| 4571 | |
| 4572 | #undef elf32_bed |
| 4573 | #define elf32_bed elf32_iamcu_bed |
| 4574 | |
| 4575 | #undef elf_backend_object_p |
| 4576 | #define elf_backend_object_p elf32_iamcu_elf_object_p |
| 4577 | |
| 4578 | #undef elf_backend_static_tls_alignment |
| 4579 | |
| 4580 | #undef elf_backend_want_plt_sym |
| 4581 | #define elf_backend_want_plt_sym 0 |
| 4582 | |
| 4583 | #undef elf_backend_strtab_flags |
| 4584 | #undef elf_backend_copy_special_section_fields |
| 4585 | |
| 4586 | #include "elf32-target.h" |
| 4587 | |
| 4588 | /* Restore defaults. */ |
| 4589 | #undef ELF_ARCH |
| 4590 | #define ELF_ARCH bfd_arch_i386 |
| 4591 | #undef ELF_MACHINE_CODE |
| 4592 | #define ELF_MACHINE_CODE EM_386 |
| 4593 | |
| 4594 | /* Native Client support. */ |
| 4595 | |
| 4596 | #undef TARGET_LITTLE_SYM |
| 4597 | #define TARGET_LITTLE_SYM i386_elf32_nacl_vec |
| 4598 | #undef TARGET_LITTLE_NAME |
| 4599 | #define TARGET_LITTLE_NAME "elf32-i386-nacl" |
| 4600 | #undef elf32_bed |
| 4601 | #define elf32_bed elf32_i386_nacl_bed |
| 4602 | |
| 4603 | #undef ELF_MAXPAGESIZE |
| 4604 | #define ELF_MAXPAGESIZE 0x10000 |
| 4605 | |
| 4606 | /* Restore defaults. */ |
| 4607 | #undef ELF_OSABI |
| 4608 | #undef elf_backend_want_plt_sym |
| 4609 | #define elf_backend_want_plt_sym 0 |
| 4610 | #undef elf_backend_post_process_headers |
| 4611 | #undef elf_backend_static_tls_alignment |
| 4612 | |
| 4613 | /* NaCl uses substantially different PLT entries for the same effects. */ |
| 4614 | |
| 4615 | #undef elf_backend_plt_alignment |
| 4616 | #define elf_backend_plt_alignment 5 |
| 4617 | #define NACL_PLT_ENTRY_SIZE 64 |
| 4618 | #define NACLMASK 0xe0 /* 32-byte alignment mask. */ |
| 4619 | |
| 4620 | static const bfd_byte elf_i386_nacl_plt0_entry[] = |
| 4621 | { |
| 4622 | 0xff, 0x35, /* pushl contents of address */ |
| 4623 | 0, 0, 0, 0, /* replaced with address of .got + 4. */ |
| 4624 | 0x8b, 0x0d, /* movl contents of address, %ecx */ |
| 4625 | 0, 0, 0, 0, /* replaced with address of .got + 8. */ |
| 4626 | 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */ |
| 4627 | 0xff, 0xe1 /* jmp *%ecx */ |
| 4628 | }; |
| 4629 | |
| 4630 | static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] = |
| 4631 | { |
| 4632 | 0x8b, 0x0d, /* movl contents of address, %ecx */ |
| 4633 | 0, 0, 0, 0, /* replaced with GOT slot address. */ |
| 4634 | 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */ |
| 4635 | 0xff, 0xe1, /* jmp *%ecx */ |
| 4636 | |
| 4637 | /* Pad to the next 32-byte boundary with nop instructions. */ |
| 4638 | 0x90, |
| 4639 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, |
| 4640 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, |
| 4641 | |
| 4642 | /* Lazy GOT entries point here (32-byte aligned). */ |
| 4643 | 0x68, /* pushl immediate */ |
| 4644 | 0, 0, 0, 0, /* replaced with reloc offset. */ |
| 4645 | 0xe9, /* jmp relative */ |
| 4646 | 0, 0, 0, 0, /* replaced with offset to .plt. */ |
| 4647 | |
| 4648 | /* Pad to the next 32-byte boundary with nop instructions. */ |
| 4649 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, |
| 4650 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, |
| 4651 | 0x90, 0x90 |
| 4652 | }; |
| 4653 | |
| 4654 | static const bfd_byte |
| 4655 | elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] = |
| 4656 | { |
| 4657 | 0xff, 0x73, 0x04, /* pushl 4(%ebx) */ |
| 4658 | 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */ |
| 4659 | 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */ |
| 4660 | 0xff, 0xe1, /* jmp *%ecx */ |
| 4661 | |
| 4662 | /* This is expected to be the same size as elf_i386_nacl_plt0_entry, |
| 4663 | so pad to that size with nop instructions. */ |
| 4664 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90 |
| 4665 | }; |
| 4666 | |
| 4667 | static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] = |
| 4668 | { |
| 4669 | 0x8b, 0x8b, /* movl offset(%ebx), %ecx */ |
| 4670 | 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */ |
| 4671 | 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */ |
| 4672 | 0xff, 0xe1, /* jmp *%ecx */ |
| 4673 | |
| 4674 | /* Pad to the next 32-byte boundary with nop instructions. */ |
| 4675 | 0x90, |
| 4676 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, |
| 4677 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, |
| 4678 | |
| 4679 | /* Lazy GOT entries point here (32-byte aligned). */ |
| 4680 | 0x68, /* pushl immediate */ |
| 4681 | 0, 0, 0, 0, /* replaced with offset into relocation table. */ |
| 4682 | 0xe9, /* jmp relative */ |
| 4683 | 0, 0, 0, 0, /* replaced with offset to start of .plt. */ |
| 4684 | |
| 4685 | /* Pad to the next 32-byte boundary with nop instructions. */ |
| 4686 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, |
| 4687 | 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, |
| 4688 | 0x90, 0x90 |
| 4689 | }; |
| 4690 | |
| 4691 | static const bfd_byte elf_i386_nacl_eh_frame_plt[] = |
| 4692 | { |
| 4693 | #if (PLT_CIE_LENGTH != 20 \ |
| 4694 | || PLT_FDE_LENGTH != 36 \ |
| 4695 | || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \ |
| 4696 | || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12) |
| 4697 | # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!" |
| 4698 | #endif |
| 4699 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 4700 | 0, 0, 0, 0, /* CIE ID */ |
| 4701 | 1, /* CIE version */ |
| 4702 | 'z', 'R', 0, /* Augmentation string */ |
| 4703 | 1, /* Code alignment factor */ |
| 4704 | 0x7c, /* Data alignment factor: -4 */ |
| 4705 | 8, /* Return address column */ |
| 4706 | 1, /* Augmentation size */ |
| 4707 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 4708 | DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */ |
| 4709 | DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */ |
| 4710 | DW_CFA_nop, DW_CFA_nop, |
| 4711 | |
| 4712 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 4713 | PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ |
| 4714 | 0, 0, 0, 0, /* R_386_PC32 .plt goes here */ |
| 4715 | 0, 0, 0, 0, /* .plt size goes here */ |
| 4716 | 0, /* Augmentation size */ |
| 4717 | DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */ |
| 4718 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ |
| 4719 | DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */ |
| 4720 | DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */ |
| 4721 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ |
| 4722 | 13, /* Block length */ |
| 4723 | DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */ |
| 4724 | DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */ |
| 4725 | DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge, |
| 4726 | DW_OP_lit2, DW_OP_shl, DW_OP_plus, |
| 4727 | DW_CFA_nop, DW_CFA_nop |
| 4728 | }; |
| 4729 | |
| 4730 | static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt = |
| 4731 | { |
| 4732 | elf_i386_nacl_plt0_entry, /* plt0_entry */ |
| 4733 | sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */ |
| 4734 | elf_i386_nacl_plt_entry, /* plt_entry */ |
| 4735 | NACL_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 4736 | NULL, /* plt_tlsdesc_entry */ |
| 4737 | 0, /* plt_tlsdesc_entry_size*/ |
| 4738 | 0, /* plt_tlsdesc_got1_offset */ |
| 4739 | 0, /* plt_tlsdesc_got2_offset */ |
| 4740 | 0, /* plt_tlsdesc_got1_insn_end */ |
| 4741 | 0, /* plt_tlsdesc_got2_insn_end */ |
| 4742 | 2, /* plt0_got1_offset */ |
| 4743 | 8, /* plt0_got2_offset */ |
| 4744 | 0, /* plt0_got2_insn_end */ |
| 4745 | 2, /* plt_got_offset */ |
| 4746 | 33, /* plt_reloc_offset */ |
| 4747 | 38, /* plt_plt_offset */ |
| 4748 | 0, /* plt_got_insn_size */ |
| 4749 | 0, /* plt_plt_insn_end */ |
| 4750 | 32, /* plt_lazy_offset */ |
| 4751 | elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */ |
| 4752 | elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */ |
| 4753 | elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */ |
| 4754 | sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */ |
| 4755 | }; |
| 4756 | |
| 4757 | static const struct elf_x86_backend_data elf_i386_nacl_arch_bed = |
| 4758 | { |
| 4759 | is_nacl /* os */ |
| 4760 | }; |
| 4761 | |
| 4762 | static bfd_boolean |
| 4763 | elf32_i386_nacl_elf_object_p (bfd *abfd) |
| 4764 | { |
| 4765 | /* Set the right machine number for a NaCl i386 ELF32 file. */ |
| 4766 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl); |
| 4767 | return TRUE; |
| 4768 | } |
| 4769 | |
| 4770 | #undef elf_backend_arch_data |
| 4771 | #define elf_backend_arch_data &elf_i386_nacl_arch_bed |
| 4772 | |
| 4773 | #undef elf_backend_object_p |
| 4774 | #define elf_backend_object_p elf32_i386_nacl_elf_object_p |
| 4775 | #undef elf_backend_modify_segment_map |
| 4776 | #define elf_backend_modify_segment_map nacl_modify_segment_map |
| 4777 | #undef elf_backend_modify_program_headers |
| 4778 | #define elf_backend_modify_program_headers nacl_modify_program_headers |
| 4779 | #undef elf_backend_final_write_processing |
| 4780 | #define elf_backend_final_write_processing nacl_final_write_processing |
| 4781 | |
| 4782 | #include "elf32-target.h" |
| 4783 | |
| 4784 | /* Restore defaults. */ |
| 4785 | #undef elf_backend_object_p |
| 4786 | #undef elf_backend_modify_segment_map |
| 4787 | #undef elf_backend_modify_program_headers |
| 4788 | #undef elf_backend_final_write_processing |
| 4789 | |
| 4790 | /* VxWorks support. */ |
| 4791 | |
| 4792 | #undef TARGET_LITTLE_SYM |
| 4793 | #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec |
| 4794 | #undef TARGET_LITTLE_NAME |
| 4795 | #define TARGET_LITTLE_NAME "elf32-i386-vxworks" |
| 4796 | #undef ELF_OSABI |
| 4797 | #undef ELF_MAXPAGESIZE |
| 4798 | #define ELF_MAXPAGESIZE 0x1000 |
| 4799 | #undef elf_backend_plt_alignment |
| 4800 | #define elf_backend_plt_alignment 4 |
| 4801 | |
| 4802 | static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed = |
| 4803 | { |
| 4804 | is_vxworks /* os */ |
| 4805 | }; |
| 4806 | |
| 4807 | #undef elf_backend_arch_data |
| 4808 | #define elf_backend_arch_data &elf_i386_vxworks_arch_bed |
| 4809 | |
| 4810 | #undef elf_backend_relocs_compatible |
| 4811 | #undef elf_backend_add_symbol_hook |
| 4812 | #define elf_backend_add_symbol_hook \ |
| 4813 | elf_vxworks_add_symbol_hook |
| 4814 | #undef elf_backend_link_output_symbol_hook |
| 4815 | #define elf_backend_link_output_symbol_hook \ |
| 4816 | elf_vxworks_link_output_symbol_hook |
| 4817 | #undef elf_backend_emit_relocs |
| 4818 | #define elf_backend_emit_relocs elf_vxworks_emit_relocs |
| 4819 | #undef elf_backend_final_write_processing |
| 4820 | #define elf_backend_final_write_processing \ |
| 4821 | elf_vxworks_final_write_processing |
| 4822 | #undef elf_backend_static_tls_alignment |
| 4823 | |
| 4824 | /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so |
| 4825 | define it. */ |
| 4826 | #undef elf_backend_want_plt_sym |
| 4827 | #define elf_backend_want_plt_sym 1 |
| 4828 | |
| 4829 | #undef elf32_bed |
| 4830 | #define elf32_bed elf32_i386_vxworks_bed |
| 4831 | |
| 4832 | #include "elf32-target.h" |