| 1 | /* X86-64 specific support for ELF |
| 2 | Copyright (C) 2000-2014 Free Software Foundation, Inc. |
| 3 | Contributed by Jan Hubicka <jh@suse.cz>. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "bfdlink.h" |
| 25 | #include "libbfd.h" |
| 26 | #include "elf-bfd.h" |
| 27 | #include "elf-nacl.h" |
| 28 | #include "bfd_stdint.h" |
| 29 | #include "objalloc.h" |
| 30 | #include "hashtab.h" |
| 31 | #include "dwarf2.h" |
| 32 | #include "libiberty.h" |
| 33 | |
| 34 | #include "elf/x86-64.h" |
| 35 | |
| 36 | #ifdef CORE_HEADER |
| 37 | #include <stdarg.h> |
| 38 | #include CORE_HEADER |
| 39 | #endif |
| 40 | |
| 41 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ |
| 42 | #define MINUS_ONE (~ (bfd_vma) 0) |
| 43 | |
| 44 | /* Since both 32-bit and 64-bit x86-64 encode relocation type in the |
| 45 | identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get |
| 46 | relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE |
| 47 | since they are the same. */ |
| 48 | |
| 49 | #define ABI_64_P(abfd) \ |
| 50 | (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64) |
| 51 | |
| 52 | /* The relocation "howto" table. Order of fields: |
| 53 | type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow, |
| 54 | special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */ |
| 55 | static reloc_howto_type x86_64_elf_howto_table[] = |
| 56 | { |
| 57 | HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont, |
| 58 | bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000, |
| 59 | FALSE), |
| 60 | HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 61 | bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE, |
| 62 | FALSE), |
| 63 | HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 64 | bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff, |
| 65 | TRUE), |
| 66 | HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 67 | bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff, |
| 68 | FALSE), |
| 69 | HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 70 | bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff, |
| 71 | TRUE), |
| 72 | HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 73 | bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff, |
| 74 | FALSE), |
| 75 | HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 76 | bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE, |
| 77 | MINUS_ONE, FALSE), |
| 78 | HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 79 | bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE, |
| 80 | MINUS_ONE, FALSE), |
| 81 | HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 82 | bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE, |
| 83 | MINUS_ONE, FALSE), |
| 84 | HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 85 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff, |
| 86 | 0xffffffff, TRUE), |
| 87 | HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, |
| 88 | bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, |
| 89 | FALSE), |
| 90 | HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 91 | bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff, |
| 92 | FALSE), |
| 93 | HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, |
| 94 | bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE), |
| 95 | HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield, |
| 96 | bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE), |
| 97 | HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, |
| 98 | bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE), |
| 99 | HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, |
| 100 | bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE), |
| 101 | HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 102 | bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE, |
| 103 | MINUS_ONE, FALSE), |
| 104 | HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 105 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE, |
| 106 | MINUS_ONE, FALSE), |
| 107 | HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 108 | bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE, |
| 109 | MINUS_ONE, FALSE), |
| 110 | HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 111 | bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff, |
| 112 | 0xffffffff, TRUE), |
| 113 | HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 114 | bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff, |
| 115 | 0xffffffff, TRUE), |
| 116 | HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 117 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff, |
| 118 | 0xffffffff, FALSE), |
| 119 | HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 120 | bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff, |
| 121 | 0xffffffff, TRUE), |
| 122 | HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 123 | bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff, |
| 124 | 0xffffffff, FALSE), |
| 125 | HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, |
| 126 | bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE, |
| 127 | TRUE), |
| 128 | HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 129 | bfd_elf_generic_reloc, "R_X86_64_GOTOFF64", |
| 130 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), |
| 131 | HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 132 | bfd_elf_generic_reloc, "R_X86_64_GOTPC32", |
| 133 | FALSE, 0xffffffff, 0xffffffff, TRUE), |
| 134 | HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 135 | bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE, |
| 136 | FALSE), |
| 137 | HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed, |
| 138 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE, |
| 139 | MINUS_ONE, TRUE), |
| 140 | HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed, |
| 141 | bfd_elf_generic_reloc, "R_X86_64_GOTPC64", |
| 142 | FALSE, MINUS_ONE, MINUS_ONE, TRUE), |
| 143 | HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 144 | bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE, |
| 145 | MINUS_ONE, FALSE), |
| 146 | HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 147 | bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE, |
| 148 | MINUS_ONE, FALSE), |
| 149 | HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, |
| 150 | bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff, |
| 151 | FALSE), |
| 152 | HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned, |
| 153 | bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE, |
| 154 | FALSE), |
| 155 | HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0, |
| 156 | complain_overflow_bitfield, bfd_elf_generic_reloc, |
| 157 | "R_X86_64_GOTPC32_TLSDESC", |
| 158 | FALSE, 0xffffffff, 0xffffffff, TRUE), |
| 159 | HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0, |
| 160 | complain_overflow_dont, bfd_elf_generic_reloc, |
| 161 | "R_X86_64_TLSDESC_CALL", |
| 162 | FALSE, 0, 0, FALSE), |
| 163 | HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0, |
| 164 | complain_overflow_bitfield, bfd_elf_generic_reloc, |
| 165 | "R_X86_64_TLSDESC", |
| 166 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), |
| 167 | HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 168 | bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE, |
| 169 | MINUS_ONE, FALSE), |
| 170 | HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 171 | bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE, |
| 172 | MINUS_ONE, FALSE), |
| 173 | HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 174 | bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff, |
| 175 | TRUE), |
| 176 | HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 177 | bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff, |
| 178 | TRUE), |
| 179 | |
| 180 | /* We have a gap in the reloc numbers here. |
| 181 | R_X86_64_standard counts the number up to this point, and |
| 182 | R_X86_64_vt_offset is the value to subtract from a reloc type of |
| 183 | R_X86_64_GNU_VT* to form an index into this table. */ |
| 184 | #define R_X86_64_standard (R_X86_64_PLT32_BND + 1) |
| 185 | #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard) |
| 186 | |
| 187 | /* GNU extension to record C++ vtable hierarchy. */ |
| 188 | HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| 189 | NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE), |
| 190 | |
| 191 | /* GNU extension to record C++ vtable member usage. */ |
| 192 | HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| 193 | _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0, |
| 194 | FALSE), |
| 195 | |
| 196 | /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */ |
| 197 | HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 198 | bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, |
| 199 | FALSE) |
| 200 | }; |
| 201 | |
| 202 | #define IS_X86_64_PCREL_TYPE(TYPE) \ |
| 203 | ( ((TYPE) == R_X86_64_PC8) \ |
| 204 | || ((TYPE) == R_X86_64_PC16) \ |
| 205 | || ((TYPE) == R_X86_64_PC32) \ |
| 206 | || ((TYPE) == R_X86_64_PC32_BND) \ |
| 207 | || ((TYPE) == R_X86_64_PC64)) |
| 208 | |
| 209 | /* Map BFD relocs to the x86_64 elf relocs. */ |
| 210 | struct elf_reloc_map |
| 211 | { |
| 212 | bfd_reloc_code_real_type bfd_reloc_val; |
| 213 | unsigned char elf_reloc_val; |
| 214 | }; |
| 215 | |
| 216 | static const struct elf_reloc_map x86_64_reloc_map[] = |
| 217 | { |
| 218 | { BFD_RELOC_NONE, R_X86_64_NONE, }, |
| 219 | { BFD_RELOC_64, R_X86_64_64, }, |
| 220 | { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, |
| 221 | { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, |
| 222 | { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, |
| 223 | { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, |
| 224 | { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, |
| 225 | { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, |
| 226 | { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, |
| 227 | { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, |
| 228 | { BFD_RELOC_32, R_X86_64_32, }, |
| 229 | { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, |
| 230 | { BFD_RELOC_16, R_X86_64_16, }, |
| 231 | { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, |
| 232 | { BFD_RELOC_8, R_X86_64_8, }, |
| 233 | { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, |
| 234 | { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, |
| 235 | { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, |
| 236 | { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, |
| 237 | { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, |
| 238 | { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, |
| 239 | { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, |
| 240 | { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, |
| 241 | { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, |
| 242 | { BFD_RELOC_64_PCREL, R_X86_64_PC64, }, |
| 243 | { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, }, |
| 244 | { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, }, |
| 245 | { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, }, |
| 246 | { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, }, |
| 247 | { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, }, |
| 248 | { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, }, |
| 249 | { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, }, |
| 250 | { BFD_RELOC_SIZE32, R_X86_64_SIZE32, }, |
| 251 | { BFD_RELOC_SIZE64, R_X86_64_SIZE64, }, |
| 252 | { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, }, |
| 253 | { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, }, |
| 254 | { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, }, |
| 255 | { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, }, |
| 256 | { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND,}, |
| 257 | { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND,}, |
| 258 | { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, |
| 259 | { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, |
| 260 | }; |
| 261 | |
| 262 | static reloc_howto_type * |
| 263 | elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type) |
| 264 | { |
| 265 | unsigned i; |
| 266 | |
| 267 | if (r_type == (unsigned int) R_X86_64_32) |
| 268 | { |
| 269 | if (ABI_64_P (abfd)) |
| 270 | i = r_type; |
| 271 | else |
| 272 | i = ARRAY_SIZE (x86_64_elf_howto_table) - 1; |
| 273 | } |
| 274 | else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT |
| 275 | || r_type >= (unsigned int) R_X86_64_max) |
| 276 | { |
| 277 | if (r_type >= (unsigned int) R_X86_64_standard) |
| 278 | { |
| 279 | (*_bfd_error_handler) (_("%B: invalid relocation type %d"), |
| 280 | abfd, (int) r_type); |
| 281 | r_type = R_X86_64_NONE; |
| 282 | } |
| 283 | i = r_type; |
| 284 | } |
| 285 | else |
| 286 | i = r_type - (unsigned int) R_X86_64_vt_offset; |
| 287 | BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type); |
| 288 | return &x86_64_elf_howto_table[i]; |
| 289 | } |
| 290 | |
| 291 | /* Given a BFD reloc type, return a HOWTO structure. */ |
| 292 | static reloc_howto_type * |
| 293 | elf_x86_64_reloc_type_lookup (bfd *abfd, |
| 294 | bfd_reloc_code_real_type code) |
| 295 | { |
| 296 | unsigned int i; |
| 297 | |
| 298 | for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); |
| 299 | i++) |
| 300 | { |
| 301 | if (x86_64_reloc_map[i].bfd_reloc_val == code) |
| 302 | return elf_x86_64_rtype_to_howto (abfd, |
| 303 | x86_64_reloc_map[i].elf_reloc_val); |
| 304 | } |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | static reloc_howto_type * |
| 309 | elf_x86_64_reloc_name_lookup (bfd *abfd, |
| 310 | const char *r_name) |
| 311 | { |
| 312 | unsigned int i; |
| 313 | |
| 314 | if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0) |
| 315 | { |
| 316 | /* Get x32 R_X86_64_32. */ |
| 317 | reloc_howto_type *reloc |
| 318 | = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1]; |
| 319 | BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32); |
| 320 | return reloc; |
| 321 | } |
| 322 | |
| 323 | for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++) |
| 324 | if (x86_64_elf_howto_table[i].name != NULL |
| 325 | && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0) |
| 326 | return &x86_64_elf_howto_table[i]; |
| 327 | |
| 328 | return NULL; |
| 329 | } |
| 330 | |
| 331 | /* Given an x86_64 ELF reloc type, fill in an arelent structure. */ |
| 332 | |
| 333 | static void |
| 334 | elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, |
| 335 | Elf_Internal_Rela *dst) |
| 336 | { |
| 337 | unsigned r_type; |
| 338 | |
| 339 | r_type = ELF32_R_TYPE (dst->r_info); |
| 340 | cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type); |
| 341 | BFD_ASSERT (r_type == cache_ptr->howto->type); |
| 342 | } |
| 343 | \f |
| 344 | /* Support for core dump NOTE sections. */ |
| 345 | static bfd_boolean |
| 346 | elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 347 | { |
| 348 | int offset; |
| 349 | size_t size; |
| 350 | |
| 351 | switch (note->descsz) |
| 352 | { |
| 353 | default: |
| 354 | return FALSE; |
| 355 | |
| 356 | case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */ |
| 357 | /* pr_cursig */ |
| 358 | elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); |
| 359 | |
| 360 | /* pr_pid */ |
| 361 | elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); |
| 362 | |
| 363 | /* pr_reg */ |
| 364 | offset = 72; |
| 365 | size = 216; |
| 366 | |
| 367 | break; |
| 368 | |
| 369 | case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ |
| 370 | /* pr_cursig */ |
| 371 | elf_tdata (abfd)->core->signal |
| 372 | = bfd_get_16 (abfd, note->descdata + 12); |
| 373 | |
| 374 | /* pr_pid */ |
| 375 | elf_tdata (abfd)->core->lwpid |
| 376 | = bfd_get_32 (abfd, note->descdata + 32); |
| 377 | |
| 378 | /* pr_reg */ |
| 379 | offset = 112; |
| 380 | size = 216; |
| 381 | |
| 382 | break; |
| 383 | } |
| 384 | |
| 385 | /* Make a ".reg/999" section. */ |
| 386 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 387 | size, note->descpos + offset); |
| 388 | } |
| 389 | |
| 390 | static bfd_boolean |
| 391 | elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 392 | { |
| 393 | switch (note->descsz) |
| 394 | { |
| 395 | default: |
| 396 | return FALSE; |
| 397 | |
| 398 | case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */ |
| 399 | elf_tdata (abfd)->core->pid |
| 400 | = bfd_get_32 (abfd, note->descdata + 12); |
| 401 | elf_tdata (abfd)->core->program |
| 402 | = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); |
| 403 | elf_tdata (abfd)->core->command |
| 404 | = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); |
| 405 | break; |
| 406 | |
| 407 | case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ |
| 408 | elf_tdata (abfd)->core->pid |
| 409 | = bfd_get_32 (abfd, note->descdata + 24); |
| 410 | elf_tdata (abfd)->core->program |
| 411 | = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); |
| 412 | elf_tdata (abfd)->core->command |
| 413 | = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); |
| 414 | } |
| 415 | |
| 416 | /* Note that for some reason, a spurious space is tacked |
| 417 | onto the end of the args in some (at least one anyway) |
| 418 | implementations, so strip it off if it exists. */ |
| 419 | |
| 420 | { |
| 421 | char *command = elf_tdata (abfd)->core->command; |
| 422 | int n = strlen (command); |
| 423 | |
| 424 | if (0 < n && command[n - 1] == ' ') |
| 425 | command[n - 1] = '\0'; |
| 426 | } |
| 427 | |
| 428 | return TRUE; |
| 429 | } |
| 430 | |
| 431 | #ifdef CORE_HEADER |
| 432 | static char * |
| 433 | elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz, |
| 434 | int note_type, ...) |
| 435 | { |
| 436 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 437 | va_list ap; |
| 438 | const char *fname, *psargs; |
| 439 | long pid; |
| 440 | int cursig; |
| 441 | const void *gregs; |
| 442 | |
| 443 | switch (note_type) |
| 444 | { |
| 445 | default: |
| 446 | return NULL; |
| 447 | |
| 448 | case NT_PRPSINFO: |
| 449 | va_start (ap, note_type); |
| 450 | fname = va_arg (ap, const char *); |
| 451 | psargs = va_arg (ap, const char *); |
| 452 | va_end (ap); |
| 453 | |
| 454 | if (bed->s->elfclass == ELFCLASS32) |
| 455 | { |
| 456 | prpsinfo32_t data; |
| 457 | memset (&data, 0, sizeof (data)); |
| 458 | strncpy (data.pr_fname, fname, sizeof (data.pr_fname)); |
| 459 | strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs)); |
| 460 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, |
| 461 | &data, sizeof (data)); |
| 462 | } |
| 463 | else |
| 464 | { |
| 465 | prpsinfo64_t data; |
| 466 | memset (&data, 0, sizeof (data)); |
| 467 | strncpy (data.pr_fname, fname, sizeof (data.pr_fname)); |
| 468 | strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs)); |
| 469 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, |
| 470 | &data, sizeof (data)); |
| 471 | } |
| 472 | /* NOTREACHED */ |
| 473 | |
| 474 | case NT_PRSTATUS: |
| 475 | va_start (ap, note_type); |
| 476 | pid = va_arg (ap, long); |
| 477 | cursig = va_arg (ap, int); |
| 478 | gregs = va_arg (ap, const void *); |
| 479 | va_end (ap); |
| 480 | |
| 481 | if (bed->s->elfclass == ELFCLASS32) |
| 482 | { |
| 483 | if (bed->elf_machine_code == EM_X86_64) |
| 484 | { |
| 485 | prstatusx32_t prstat; |
| 486 | memset (&prstat, 0, sizeof (prstat)); |
| 487 | prstat.pr_pid = pid; |
| 488 | prstat.pr_cursig = cursig; |
| 489 | memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); |
| 490 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, |
| 491 | &prstat, sizeof (prstat)); |
| 492 | } |
| 493 | else |
| 494 | { |
| 495 | prstatus32_t prstat; |
| 496 | memset (&prstat, 0, sizeof (prstat)); |
| 497 | prstat.pr_pid = pid; |
| 498 | prstat.pr_cursig = cursig; |
| 499 | memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); |
| 500 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, |
| 501 | &prstat, sizeof (prstat)); |
| 502 | } |
| 503 | } |
| 504 | else |
| 505 | { |
| 506 | prstatus64_t prstat; |
| 507 | memset (&prstat, 0, sizeof (prstat)); |
| 508 | prstat.pr_pid = pid; |
| 509 | prstat.pr_cursig = cursig; |
| 510 | memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg)); |
| 511 | return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type, |
| 512 | &prstat, sizeof (prstat)); |
| 513 | } |
| 514 | } |
| 515 | /* NOTREACHED */ |
| 516 | } |
| 517 | #endif |
| 518 | \f |
| 519 | /* Functions for the x86-64 ELF linker. */ |
| 520 | |
| 521 | /* The name of the dynamic interpreter. This is put in the .interp |
| 522 | section. */ |
| 523 | |
| 524 | #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1" |
| 525 | #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1" |
| 526 | |
| 527 | /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid |
| 528 | copying dynamic variables from a shared lib into an app's dynbss |
| 529 | section, and instead use a dynamic relocation to point into the |
| 530 | shared lib. */ |
| 531 | #define ELIMINATE_COPY_RELOCS 1 |
| 532 | |
| 533 | /* The size in bytes of an entry in the global offset table. */ |
| 534 | |
| 535 | #define GOT_ENTRY_SIZE 8 |
| 536 | |
| 537 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 538 | |
| 539 | #define PLT_ENTRY_SIZE 16 |
| 540 | |
| 541 | /* The first entry in a procedure linkage table looks like this. See the |
| 542 | SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */ |
| 543 | |
| 544 | static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] = |
| 545 | { |
| 546 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
| 547 | 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ |
| 548 | 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ |
| 549 | }; |
| 550 | |
| 551 | /* Subsequent entries in a procedure linkage table look like this. */ |
| 552 | |
| 553 | static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] = |
| 554 | { |
| 555 | 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ |
| 556 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 557 | 0x68, /* pushq immediate */ |
| 558 | 0, 0, 0, 0, /* replaced with index into relocation table. */ |
| 559 | 0xe9, /* jmp relative */ |
| 560 | 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ |
| 561 | }; |
| 562 | |
| 563 | /* The first entry in a procedure linkage table with BND relocations |
| 564 | like this. */ |
| 565 | |
| 566 | static const bfd_byte elf_x86_64_bnd_plt0_entry[PLT_ENTRY_SIZE] = |
| 567 | { |
| 568 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
| 569 | 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */ |
| 570 | 0x0f, 0x1f, 0 /* nopl (%rax) */ |
| 571 | }; |
| 572 | |
| 573 | /* Subsequent entries for legacy branches in a procedure linkage table |
| 574 | with BND relocations look like this. */ |
| 575 | |
| 576 | static const bfd_byte elf_x86_64_legacy_plt_entry[PLT_ENTRY_SIZE] = |
| 577 | { |
| 578 | 0x68, 0, 0, 0, 0, /* pushq immediate */ |
| 579 | 0xe9, 0, 0, 0, 0, /* jmpq relative */ |
| 580 | 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */ |
| 581 | }; |
| 582 | |
| 583 | /* Subsequent entries for branches with BND prefx in a procedure linkage |
| 584 | table with BND relocations look like this. */ |
| 585 | |
| 586 | static const bfd_byte elf_x86_64_bnd_plt_entry[PLT_ENTRY_SIZE] = |
| 587 | { |
| 588 | 0x68, 0, 0, 0, 0, /* pushq immediate */ |
| 589 | 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */ |
| 590 | 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */ |
| 591 | }; |
| 592 | |
| 593 | /* Entries for legacy branches in the second procedure linkage table |
| 594 | look like this. */ |
| 595 | |
| 596 | static const bfd_byte elf_x86_64_legacy_plt2_entry[8] = |
| 597 | { |
| 598 | 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ |
| 599 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 600 | 0x66, 0x90 /* xchg %ax,%ax */ |
| 601 | }; |
| 602 | |
| 603 | /* Entries for branches with BND prefix in the second procedure linkage |
| 604 | table look like this. */ |
| 605 | |
| 606 | static const bfd_byte elf_x86_64_bnd_plt2_entry[8] = |
| 607 | { |
| 608 | 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */ |
| 609 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 610 | 0x90 /* nop */ |
| 611 | }; |
| 612 | |
| 613 | /* .eh_frame covering the .plt section. */ |
| 614 | |
| 615 | static const bfd_byte elf_x86_64_eh_frame_plt[] = |
| 616 | { |
| 617 | #define PLT_CIE_LENGTH 20 |
| 618 | #define PLT_FDE_LENGTH 36 |
| 619 | #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8 |
| 620 | #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12 |
| 621 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 622 | 0, 0, 0, 0, /* CIE ID */ |
| 623 | 1, /* CIE version */ |
| 624 | 'z', 'R', 0, /* Augmentation string */ |
| 625 | 1, /* Code alignment factor */ |
| 626 | 0x78, /* Data alignment factor */ |
| 627 | 16, /* Return address column */ |
| 628 | 1, /* Augmentation size */ |
| 629 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 630 | DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ |
| 631 | DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ |
| 632 | DW_CFA_nop, DW_CFA_nop, |
| 633 | |
| 634 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 635 | PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */ |
| 636 | 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ |
| 637 | 0, 0, 0, 0, /* .plt size goes here */ |
| 638 | 0, /* Augmentation size */ |
| 639 | DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ |
| 640 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ |
| 641 | DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ |
| 642 | DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */ |
| 643 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ |
| 644 | 11, /* Block length */ |
| 645 | DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ |
| 646 | DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ |
| 647 | DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge, |
| 648 | DW_OP_lit3, DW_OP_shl, DW_OP_plus, |
| 649 | DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop |
| 650 | }; |
| 651 | |
| 652 | /* Architecture-specific backend data for x86-64. */ |
| 653 | |
| 654 | struct elf_x86_64_backend_data |
| 655 | { |
| 656 | /* Templates for the initial PLT entry and for subsequent entries. */ |
| 657 | const bfd_byte *plt0_entry; |
| 658 | const bfd_byte *plt_entry; |
| 659 | unsigned int plt_entry_size; /* Size of each PLT entry. */ |
| 660 | |
| 661 | /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */ |
| 662 | unsigned int plt0_got1_offset; |
| 663 | unsigned int plt0_got2_offset; |
| 664 | |
| 665 | /* Offset of the end of the PC-relative instruction containing |
| 666 | plt0_got2_offset. */ |
| 667 | unsigned int plt0_got2_insn_end; |
| 668 | |
| 669 | /* Offsets into plt_entry that are to be replaced with... */ |
| 670 | unsigned int plt_got_offset; /* ... address of this symbol in .got. */ |
| 671 | unsigned int plt_reloc_offset; /* ... offset into relocation table. */ |
| 672 | unsigned int plt_plt_offset; /* ... offset to start of .plt. */ |
| 673 | |
| 674 | /* Length of the PC-relative instruction containing plt_got_offset. */ |
| 675 | unsigned int plt_got_insn_size; |
| 676 | |
| 677 | /* Offset of the end of the PC-relative jump to plt0_entry. */ |
| 678 | unsigned int plt_plt_insn_end; |
| 679 | |
| 680 | /* Offset into plt_entry where the initial value of the GOT entry points. */ |
| 681 | unsigned int plt_lazy_offset; |
| 682 | |
| 683 | /* .eh_frame covering the .plt section. */ |
| 684 | const bfd_byte *eh_frame_plt; |
| 685 | unsigned int eh_frame_plt_size; |
| 686 | }; |
| 687 | |
| 688 | #define get_elf_x86_64_arch_data(bed) \ |
| 689 | ((const struct elf_x86_64_backend_data *) (bed)->arch_data) |
| 690 | |
| 691 | #define get_elf_x86_64_backend_data(abfd) \ |
| 692 | get_elf_x86_64_arch_data (get_elf_backend_data (abfd)) |
| 693 | |
| 694 | #define GET_PLT_ENTRY_SIZE(abfd) \ |
| 695 | get_elf_x86_64_backend_data (abfd)->plt_entry_size |
| 696 | |
| 697 | /* These are the standard parameters. */ |
| 698 | static const struct elf_x86_64_backend_data elf_x86_64_arch_bed = |
| 699 | { |
| 700 | elf_x86_64_plt0_entry, /* plt0_entry */ |
| 701 | elf_x86_64_plt_entry, /* plt_entry */ |
| 702 | sizeof (elf_x86_64_plt_entry), /* plt_entry_size */ |
| 703 | 2, /* plt0_got1_offset */ |
| 704 | 8, /* plt0_got2_offset */ |
| 705 | 12, /* plt0_got2_insn_end */ |
| 706 | 2, /* plt_got_offset */ |
| 707 | 7, /* plt_reloc_offset */ |
| 708 | 12, /* plt_plt_offset */ |
| 709 | 6, /* plt_got_insn_size */ |
| 710 | PLT_ENTRY_SIZE, /* plt_plt_insn_end */ |
| 711 | 6, /* plt_lazy_offset */ |
| 712 | elf_x86_64_eh_frame_plt, /* eh_frame_plt */ |
| 713 | sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */ |
| 714 | }; |
| 715 | |
| 716 | static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed = |
| 717 | { |
| 718 | elf_x86_64_bnd_plt0_entry, /* plt0_entry */ |
| 719 | elf_x86_64_bnd_plt_entry, /* plt_entry */ |
| 720 | sizeof (elf_x86_64_bnd_plt_entry), /* plt_entry_size */ |
| 721 | 2, /* plt0_got1_offset */ |
| 722 | 1+8, /* plt0_got2_offset */ |
| 723 | 1+12, /* plt0_got2_insn_end */ |
| 724 | 1+2, /* plt_got_offset */ |
| 725 | 1, /* plt_reloc_offset */ |
| 726 | 7, /* plt_plt_offset */ |
| 727 | 1+6, /* plt_got_insn_size */ |
| 728 | 11, /* plt_plt_insn_end */ |
| 729 | 0, /* plt_lazy_offset */ |
| 730 | elf_x86_64_eh_frame_plt, /* eh_frame_plt */ |
| 731 | sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */ |
| 732 | }; |
| 733 | |
| 734 | #define elf_backend_arch_data &elf_x86_64_arch_bed |
| 735 | |
| 736 | /* x86-64 ELF linker hash entry. */ |
| 737 | |
| 738 | struct elf_x86_64_link_hash_entry |
| 739 | { |
| 740 | struct elf_link_hash_entry elf; |
| 741 | |
| 742 | /* Track dynamic relocs copied for this symbol. */ |
| 743 | struct elf_dyn_relocs *dyn_relocs; |
| 744 | |
| 745 | #define GOT_UNKNOWN 0 |
| 746 | #define GOT_NORMAL 1 |
| 747 | #define GOT_TLS_GD 2 |
| 748 | #define GOT_TLS_IE 3 |
| 749 | #define GOT_TLS_GDESC 4 |
| 750 | #define GOT_TLS_GD_BOTH_P(type) \ |
| 751 | ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) |
| 752 | #define GOT_TLS_GD_P(type) \ |
| 753 | ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) |
| 754 | #define GOT_TLS_GDESC_P(type) \ |
| 755 | ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) |
| 756 | #define GOT_TLS_GD_ANY_P(type) \ |
| 757 | (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) |
| 758 | unsigned char tls_type; |
| 759 | |
| 760 | /* TRUE if symbol has at least one BND relocation. */ |
| 761 | bfd_boolean has_bnd_reloc; |
| 762 | |
| 763 | /* Information about the second PLT entry. Filled when has_bnd_reloc is |
| 764 | set. */ |
| 765 | union gotplt_union plt_bnd; |
| 766 | |
| 767 | /* Offset of the GOTPLT entry reserved for the TLS descriptor, |
| 768 | starting at the end of the jump table. */ |
| 769 | bfd_vma tlsdesc_got; |
| 770 | }; |
| 771 | |
| 772 | #define elf_x86_64_hash_entry(ent) \ |
| 773 | ((struct elf_x86_64_link_hash_entry *)(ent)) |
| 774 | |
| 775 | struct elf_x86_64_obj_tdata |
| 776 | { |
| 777 | struct elf_obj_tdata root; |
| 778 | |
| 779 | /* tls_type for each local got entry. */ |
| 780 | char *local_got_tls_type; |
| 781 | |
| 782 | /* GOTPLT entries for TLS descriptors. */ |
| 783 | bfd_vma *local_tlsdesc_gotent; |
| 784 | }; |
| 785 | |
| 786 | #define elf_x86_64_tdata(abfd) \ |
| 787 | ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any) |
| 788 | |
| 789 | #define elf_x86_64_local_got_tls_type(abfd) \ |
| 790 | (elf_x86_64_tdata (abfd)->local_got_tls_type) |
| 791 | |
| 792 | #define elf_x86_64_local_tlsdesc_gotent(abfd) \ |
| 793 | (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent) |
| 794 | |
| 795 | #define is_x86_64_elf(bfd) \ |
| 796 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ |
| 797 | && elf_tdata (bfd) != NULL \ |
| 798 | && elf_object_id (bfd) == X86_64_ELF_DATA) |
| 799 | |
| 800 | static bfd_boolean |
| 801 | elf_x86_64_mkobject (bfd *abfd) |
| 802 | { |
| 803 | return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata), |
| 804 | X86_64_ELF_DATA); |
| 805 | } |
| 806 | |
| 807 | /* x86-64 ELF linker hash table. */ |
| 808 | |
| 809 | struct elf_x86_64_link_hash_table |
| 810 | { |
| 811 | struct elf_link_hash_table elf; |
| 812 | |
| 813 | /* Short-cuts to get to dynamic linker sections. */ |
| 814 | asection *sdynbss; |
| 815 | asection *srelbss; |
| 816 | asection *plt_eh_frame; |
| 817 | asection *plt_bnd; |
| 818 | |
| 819 | union |
| 820 | { |
| 821 | bfd_signed_vma refcount; |
| 822 | bfd_vma offset; |
| 823 | } tls_ld_got; |
| 824 | |
| 825 | /* The amount of space used by the jump slots in the GOT. */ |
| 826 | bfd_vma sgotplt_jump_table_size; |
| 827 | |
| 828 | /* Small local sym cache. */ |
| 829 | struct sym_cache sym_cache; |
| 830 | |
| 831 | bfd_vma (*r_info) (bfd_vma, bfd_vma); |
| 832 | bfd_vma (*r_sym) (bfd_vma); |
| 833 | unsigned int pointer_r_type; |
| 834 | const char *dynamic_interpreter; |
| 835 | int dynamic_interpreter_size; |
| 836 | |
| 837 | /* _TLS_MODULE_BASE_ symbol. */ |
| 838 | struct bfd_link_hash_entry *tls_module_base; |
| 839 | |
| 840 | /* Used by local STT_GNU_IFUNC symbols. */ |
| 841 | htab_t loc_hash_table; |
| 842 | void * loc_hash_memory; |
| 843 | |
| 844 | /* The offset into splt of the PLT entry for the TLS descriptor |
| 845 | resolver. Special values are 0, if not necessary (or not found |
| 846 | to be necessary yet), and -1 if needed but not determined |
| 847 | yet. */ |
| 848 | bfd_vma tlsdesc_plt; |
| 849 | /* The offset into sgot of the GOT entry used by the PLT entry |
| 850 | above. */ |
| 851 | bfd_vma tlsdesc_got; |
| 852 | |
| 853 | /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */ |
| 854 | bfd_vma next_jump_slot_index; |
| 855 | /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */ |
| 856 | bfd_vma next_irelative_index; |
| 857 | }; |
| 858 | |
| 859 | /* Get the x86-64 ELF linker hash table from a link_info structure. */ |
| 860 | |
| 861 | #define elf_x86_64_hash_table(p) \ |
| 862 | (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ |
| 863 | == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL) |
| 864 | |
| 865 | #define elf_x86_64_compute_jump_table_size(htab) \ |
| 866 | ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE) |
| 867 | |
| 868 | /* Create an entry in an x86-64 ELF linker hash table. */ |
| 869 | |
| 870 | static struct bfd_hash_entry * |
| 871 | elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry, |
| 872 | struct bfd_hash_table *table, |
| 873 | const char *string) |
| 874 | { |
| 875 | /* Allocate the structure if it has not already been allocated by a |
| 876 | subclass. */ |
| 877 | if (entry == NULL) |
| 878 | { |
| 879 | entry = (struct bfd_hash_entry *) |
| 880 | bfd_hash_allocate (table, |
| 881 | sizeof (struct elf_x86_64_link_hash_entry)); |
| 882 | if (entry == NULL) |
| 883 | return entry; |
| 884 | } |
| 885 | |
| 886 | /* Call the allocation method of the superclass. */ |
| 887 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 888 | if (entry != NULL) |
| 889 | { |
| 890 | struct elf_x86_64_link_hash_entry *eh; |
| 891 | |
| 892 | eh = (struct elf_x86_64_link_hash_entry *) entry; |
| 893 | eh->dyn_relocs = NULL; |
| 894 | eh->tls_type = GOT_UNKNOWN; |
| 895 | eh->has_bnd_reloc = FALSE; |
| 896 | eh->plt_bnd.offset = (bfd_vma) -1; |
| 897 | eh->tlsdesc_got = (bfd_vma) -1; |
| 898 | } |
| 899 | |
| 900 | return entry; |
| 901 | } |
| 902 | |
| 903 | /* Compute a hash of a local hash entry. We use elf_link_hash_entry |
| 904 | for local symbol so that we can handle local STT_GNU_IFUNC symbols |
| 905 | as global symbol. We reuse indx and dynstr_index for local symbol |
| 906 | hash since they aren't used by global symbols in this backend. */ |
| 907 | |
| 908 | static hashval_t |
| 909 | elf_x86_64_local_htab_hash (const void *ptr) |
| 910 | { |
| 911 | struct elf_link_hash_entry *h |
| 912 | = (struct elf_link_hash_entry *) ptr; |
| 913 | return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); |
| 914 | } |
| 915 | |
| 916 | /* Compare local hash entries. */ |
| 917 | |
| 918 | static int |
| 919 | elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2) |
| 920 | { |
| 921 | struct elf_link_hash_entry *h1 |
| 922 | = (struct elf_link_hash_entry *) ptr1; |
| 923 | struct elf_link_hash_entry *h2 |
| 924 | = (struct elf_link_hash_entry *) ptr2; |
| 925 | |
| 926 | return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; |
| 927 | } |
| 928 | |
| 929 | /* Find and/or create a hash entry for local symbol. */ |
| 930 | |
| 931 | static struct elf_link_hash_entry * |
| 932 | elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab, |
| 933 | bfd *abfd, const Elf_Internal_Rela *rel, |
| 934 | bfd_boolean create) |
| 935 | { |
| 936 | struct elf_x86_64_link_hash_entry e, *ret; |
| 937 | asection *sec = abfd->sections; |
| 938 | hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, |
| 939 | htab->r_sym (rel->r_info)); |
| 940 | void **slot; |
| 941 | |
| 942 | e.elf.indx = sec->id; |
| 943 | e.elf.dynstr_index = htab->r_sym (rel->r_info); |
| 944 | slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, |
| 945 | create ? INSERT : NO_INSERT); |
| 946 | |
| 947 | if (!slot) |
| 948 | return NULL; |
| 949 | |
| 950 | if (*slot) |
| 951 | { |
| 952 | ret = (struct elf_x86_64_link_hash_entry *) *slot; |
| 953 | return &ret->elf; |
| 954 | } |
| 955 | |
| 956 | ret = (struct elf_x86_64_link_hash_entry *) |
| 957 | objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, |
| 958 | sizeof (struct elf_x86_64_link_hash_entry)); |
| 959 | if (ret) |
| 960 | { |
| 961 | memset (ret, 0, sizeof (*ret)); |
| 962 | ret->elf.indx = sec->id; |
| 963 | ret->elf.dynstr_index = htab->r_sym (rel->r_info); |
| 964 | ret->elf.dynindx = -1; |
| 965 | *slot = ret; |
| 966 | } |
| 967 | return &ret->elf; |
| 968 | } |
| 969 | |
| 970 | /* Create an X86-64 ELF linker hash table. */ |
| 971 | |
| 972 | static struct bfd_link_hash_table * |
| 973 | elf_x86_64_link_hash_table_create (bfd *abfd) |
| 974 | { |
| 975 | struct elf_x86_64_link_hash_table *ret; |
| 976 | bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table); |
| 977 | |
| 978 | ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt); |
| 979 | if (ret == NULL) |
| 980 | return NULL; |
| 981 | |
| 982 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, |
| 983 | elf_x86_64_link_hash_newfunc, |
| 984 | sizeof (struct elf_x86_64_link_hash_entry), |
| 985 | X86_64_ELF_DATA)) |
| 986 | { |
| 987 | free (ret); |
| 988 | return NULL; |
| 989 | } |
| 990 | |
| 991 | if (ABI_64_P (abfd)) |
| 992 | { |
| 993 | ret->r_info = elf64_r_info; |
| 994 | ret->r_sym = elf64_r_sym; |
| 995 | ret->pointer_r_type = R_X86_64_64; |
| 996 | ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER; |
| 997 | ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER; |
| 998 | } |
| 999 | else |
| 1000 | { |
| 1001 | ret->r_info = elf32_r_info; |
| 1002 | ret->r_sym = elf32_r_sym; |
| 1003 | ret->pointer_r_type = R_X86_64_32; |
| 1004 | ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER; |
| 1005 | ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER; |
| 1006 | } |
| 1007 | |
| 1008 | ret->loc_hash_table = htab_try_create (1024, |
| 1009 | elf_x86_64_local_htab_hash, |
| 1010 | elf_x86_64_local_htab_eq, |
| 1011 | NULL); |
| 1012 | ret->loc_hash_memory = objalloc_create (); |
| 1013 | if (!ret->loc_hash_table || !ret->loc_hash_memory) |
| 1014 | { |
| 1015 | free (ret); |
| 1016 | return NULL; |
| 1017 | } |
| 1018 | |
| 1019 | return &ret->elf.root; |
| 1020 | } |
| 1021 | |
| 1022 | /* Destroy an X86-64 ELF linker hash table. */ |
| 1023 | |
| 1024 | static void |
| 1025 | elf_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash) |
| 1026 | { |
| 1027 | struct elf_x86_64_link_hash_table *htab |
| 1028 | = (struct elf_x86_64_link_hash_table *) hash; |
| 1029 | |
| 1030 | if (htab->loc_hash_table) |
| 1031 | htab_delete (htab->loc_hash_table); |
| 1032 | if (htab->loc_hash_memory) |
| 1033 | objalloc_free ((struct objalloc *) htab->loc_hash_memory); |
| 1034 | _bfd_elf_link_hash_table_free (hash); |
| 1035 | } |
| 1036 | |
| 1037 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and |
| 1038 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 1039 | hash table. */ |
| 1040 | |
| 1041 | static bfd_boolean |
| 1042 | elf_x86_64_create_dynamic_sections (bfd *dynobj, |
| 1043 | struct bfd_link_info *info) |
| 1044 | { |
| 1045 | struct elf_x86_64_link_hash_table *htab; |
| 1046 | |
| 1047 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 1048 | return FALSE; |
| 1049 | |
| 1050 | htab = elf_x86_64_hash_table (info); |
| 1051 | if (htab == NULL) |
| 1052 | return FALSE; |
| 1053 | |
| 1054 | htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss"); |
| 1055 | if (!info->shared) |
| 1056 | htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss"); |
| 1057 | |
| 1058 | if (!htab->sdynbss |
| 1059 | || (!info->shared && !htab->srelbss)) |
| 1060 | abort (); |
| 1061 | |
| 1062 | if (!info->no_ld_generated_unwind_info |
| 1063 | && htab->plt_eh_frame == NULL |
| 1064 | && htab->elf.splt != NULL) |
| 1065 | { |
| 1066 | flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY |
| 1067 | | SEC_HAS_CONTENTS | SEC_IN_MEMORY |
| 1068 | | SEC_LINKER_CREATED); |
| 1069 | htab->plt_eh_frame |
| 1070 | = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags); |
| 1071 | if (htab->plt_eh_frame == NULL |
| 1072 | || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3)) |
| 1073 | return FALSE; |
| 1074 | } |
| 1075 | return TRUE; |
| 1076 | } |
| 1077 | |
| 1078 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 1079 | |
| 1080 | static void |
| 1081 | elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info, |
| 1082 | struct elf_link_hash_entry *dir, |
| 1083 | struct elf_link_hash_entry *ind) |
| 1084 | { |
| 1085 | struct elf_x86_64_link_hash_entry *edir, *eind; |
| 1086 | |
| 1087 | edir = (struct elf_x86_64_link_hash_entry *) dir; |
| 1088 | eind = (struct elf_x86_64_link_hash_entry *) ind; |
| 1089 | |
| 1090 | if (!edir->has_bnd_reloc) |
| 1091 | edir->has_bnd_reloc = eind->has_bnd_reloc; |
| 1092 | |
| 1093 | if (eind->dyn_relocs != NULL) |
| 1094 | { |
| 1095 | if (edir->dyn_relocs != NULL) |
| 1096 | { |
| 1097 | struct elf_dyn_relocs **pp; |
| 1098 | struct elf_dyn_relocs *p; |
| 1099 | |
| 1100 | /* Add reloc counts against the indirect sym to the direct sym |
| 1101 | list. Merge any entries against the same section. */ |
| 1102 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| 1103 | { |
| 1104 | struct elf_dyn_relocs *q; |
| 1105 | |
| 1106 | for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| 1107 | if (q->sec == p->sec) |
| 1108 | { |
| 1109 | q->pc_count += p->pc_count; |
| 1110 | q->count += p->count; |
| 1111 | *pp = p->next; |
| 1112 | break; |
| 1113 | } |
| 1114 | if (q == NULL) |
| 1115 | pp = &p->next; |
| 1116 | } |
| 1117 | *pp = edir->dyn_relocs; |
| 1118 | } |
| 1119 | |
| 1120 | edir->dyn_relocs = eind->dyn_relocs; |
| 1121 | eind->dyn_relocs = NULL; |
| 1122 | } |
| 1123 | |
| 1124 | if (ind->root.type == bfd_link_hash_indirect |
| 1125 | && dir->got.refcount <= 0) |
| 1126 | { |
| 1127 | edir->tls_type = eind->tls_type; |
| 1128 | eind->tls_type = GOT_UNKNOWN; |
| 1129 | } |
| 1130 | |
| 1131 | if (ELIMINATE_COPY_RELOCS |
| 1132 | && ind->root.type != bfd_link_hash_indirect |
| 1133 | && dir->dynamic_adjusted) |
| 1134 | { |
| 1135 | /* If called to transfer flags for a weakdef during processing |
| 1136 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. |
| 1137 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ |
| 1138 | dir->ref_dynamic |= ind->ref_dynamic; |
| 1139 | dir->ref_regular |= ind->ref_regular; |
| 1140 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; |
| 1141 | dir->needs_plt |= ind->needs_plt; |
| 1142 | dir->pointer_equality_needed |= ind->pointer_equality_needed; |
| 1143 | } |
| 1144 | else |
| 1145 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); |
| 1146 | } |
| 1147 | |
| 1148 | static bfd_boolean |
| 1149 | elf64_x86_64_elf_object_p (bfd *abfd) |
| 1150 | { |
| 1151 | /* Set the right machine number for an x86-64 elf64 file. */ |
| 1152 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); |
| 1153 | return TRUE; |
| 1154 | } |
| 1155 | |
| 1156 | static bfd_boolean |
| 1157 | elf32_x86_64_elf_object_p (bfd *abfd) |
| 1158 | { |
| 1159 | /* Set the right machine number for an x86-64 elf32 file. */ |
| 1160 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32); |
| 1161 | return TRUE; |
| 1162 | } |
| 1163 | |
| 1164 | /* Return TRUE if the TLS access code sequence support transition |
| 1165 | from R_TYPE. */ |
| 1166 | |
| 1167 | static bfd_boolean |
| 1168 | elf_x86_64_check_tls_transition (bfd *abfd, |
| 1169 | struct bfd_link_info *info, |
| 1170 | asection *sec, |
| 1171 | bfd_byte *contents, |
| 1172 | Elf_Internal_Shdr *symtab_hdr, |
| 1173 | struct elf_link_hash_entry **sym_hashes, |
| 1174 | unsigned int r_type, |
| 1175 | const Elf_Internal_Rela *rel, |
| 1176 | const Elf_Internal_Rela *relend) |
| 1177 | { |
| 1178 | unsigned int val; |
| 1179 | unsigned long r_symndx; |
| 1180 | bfd_boolean largepic = FALSE; |
| 1181 | struct elf_link_hash_entry *h; |
| 1182 | bfd_vma offset; |
| 1183 | struct elf_x86_64_link_hash_table *htab; |
| 1184 | |
| 1185 | /* Get the section contents. */ |
| 1186 | if (contents == NULL) |
| 1187 | { |
| 1188 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 1189 | contents = elf_section_data (sec)->this_hdr.contents; |
| 1190 | else |
| 1191 | { |
| 1192 | /* FIXME: How to better handle error condition? */ |
| 1193 | if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 1194 | return FALSE; |
| 1195 | |
| 1196 | /* Cache the section contents for elf_link_input_bfd. */ |
| 1197 | elf_section_data (sec)->this_hdr.contents = contents; |
| 1198 | } |
| 1199 | } |
| 1200 | |
| 1201 | htab = elf_x86_64_hash_table (info); |
| 1202 | offset = rel->r_offset; |
| 1203 | switch (r_type) |
| 1204 | { |
| 1205 | case R_X86_64_TLSGD: |
| 1206 | case R_X86_64_TLSLD: |
| 1207 | if ((rel + 1) >= relend) |
| 1208 | return FALSE; |
| 1209 | |
| 1210 | if (r_type == R_X86_64_TLSGD) |
| 1211 | { |
| 1212 | /* Check transition from GD access model. For 64bit, only |
| 1213 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 1214 | .word 0x6666; rex64; call __tls_get_addr |
| 1215 | can transit to different access model. For 32bit, only |
| 1216 | leaq foo@tlsgd(%rip), %rdi |
| 1217 | .word 0x6666; rex64; call __tls_get_addr |
| 1218 | can transit to different access model. For largepic |
| 1219 | we also support: |
| 1220 | leaq foo@tlsgd(%rip), %rdi |
| 1221 | movabsq $__tls_get_addr@pltoff, %rax |
| 1222 | addq $rbx, %rax |
| 1223 | call *%rax. */ |
| 1224 | |
| 1225 | static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 }; |
| 1226 | static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d }; |
| 1227 | |
| 1228 | if ((offset + 12) > sec->size) |
| 1229 | return FALSE; |
| 1230 | |
| 1231 | if (memcmp (contents + offset + 4, call, 4) != 0) |
| 1232 | { |
| 1233 | if (!ABI_64_P (abfd) |
| 1234 | || (offset + 19) > sec->size |
| 1235 | || offset < 3 |
| 1236 | || memcmp (contents + offset - 3, leaq + 1, 3) != 0 |
| 1237 | || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0 |
| 1238 | || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5) |
| 1239 | != 0) |
| 1240 | return FALSE; |
| 1241 | largepic = TRUE; |
| 1242 | } |
| 1243 | else if (ABI_64_P (abfd)) |
| 1244 | { |
| 1245 | if (offset < 4 |
| 1246 | || memcmp (contents + offset - 4, leaq, 4) != 0) |
| 1247 | return FALSE; |
| 1248 | } |
| 1249 | else |
| 1250 | { |
| 1251 | if (offset < 3 |
| 1252 | || memcmp (contents + offset - 3, leaq + 1, 3) != 0) |
| 1253 | return FALSE; |
| 1254 | } |
| 1255 | } |
| 1256 | else |
| 1257 | { |
| 1258 | /* Check transition from LD access model. Only |
| 1259 | leaq foo@tlsld(%rip), %rdi; |
| 1260 | call __tls_get_addr |
| 1261 | can transit to different access model. For largepic |
| 1262 | we also support: |
| 1263 | leaq foo@tlsld(%rip), %rdi |
| 1264 | movabsq $__tls_get_addr@pltoff, %rax |
| 1265 | addq $rbx, %rax |
| 1266 | call *%rax. */ |
| 1267 | |
| 1268 | static const unsigned char lea[] = { 0x48, 0x8d, 0x3d }; |
| 1269 | |
| 1270 | if (offset < 3 || (offset + 9) > sec->size) |
| 1271 | return FALSE; |
| 1272 | |
| 1273 | if (memcmp (contents + offset - 3, lea, 3) != 0) |
| 1274 | return FALSE; |
| 1275 | |
| 1276 | if (0xe8 != *(contents + offset + 4)) |
| 1277 | { |
| 1278 | if (!ABI_64_P (abfd) |
| 1279 | || (offset + 19) > sec->size |
| 1280 | || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0 |
| 1281 | || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5) |
| 1282 | != 0) |
| 1283 | return FALSE; |
| 1284 | largepic = TRUE; |
| 1285 | } |
| 1286 | } |
| 1287 | |
| 1288 | r_symndx = htab->r_sym (rel[1].r_info); |
| 1289 | if (r_symndx < symtab_hdr->sh_info) |
| 1290 | return FALSE; |
| 1291 | |
| 1292 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1293 | /* Use strncmp to check __tls_get_addr since __tls_get_addr |
| 1294 | may be versioned. */ |
| 1295 | return (h != NULL |
| 1296 | && h->root.root.string != NULL |
| 1297 | && (largepic |
| 1298 | ? ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64 |
| 1299 | : (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32 |
| 1300 | || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)) |
| 1301 | && (strncmp (h->root.root.string, |
| 1302 | "__tls_get_addr", 14) == 0)); |
| 1303 | |
| 1304 | case R_X86_64_GOTTPOFF: |
| 1305 | /* Check transition from IE access model: |
| 1306 | mov foo@gottpoff(%rip), %reg |
| 1307 | add foo@gottpoff(%rip), %reg |
| 1308 | */ |
| 1309 | |
| 1310 | /* Check REX prefix first. */ |
| 1311 | if (offset >= 3 && (offset + 4) <= sec->size) |
| 1312 | { |
| 1313 | val = bfd_get_8 (abfd, contents + offset - 3); |
| 1314 | if (val != 0x48 && val != 0x4c) |
| 1315 | { |
| 1316 | /* X32 may have 0x44 REX prefix or no REX prefix. */ |
| 1317 | if (ABI_64_P (abfd)) |
| 1318 | return FALSE; |
| 1319 | } |
| 1320 | } |
| 1321 | else |
| 1322 | { |
| 1323 | /* X32 may not have any REX prefix. */ |
| 1324 | if (ABI_64_P (abfd)) |
| 1325 | return FALSE; |
| 1326 | if (offset < 2 || (offset + 3) > sec->size) |
| 1327 | return FALSE; |
| 1328 | } |
| 1329 | |
| 1330 | val = bfd_get_8 (abfd, contents + offset - 2); |
| 1331 | if (val != 0x8b && val != 0x03) |
| 1332 | return FALSE; |
| 1333 | |
| 1334 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1335 | return (val & 0xc7) == 5; |
| 1336 | |
| 1337 | case R_X86_64_GOTPC32_TLSDESC: |
| 1338 | /* Check transition from GDesc access model: |
| 1339 | leaq x@tlsdesc(%rip), %rax |
| 1340 | |
| 1341 | Make sure it's a leaq adding rip to a 32-bit offset |
| 1342 | into any register, although it's probably almost always |
| 1343 | going to be rax. */ |
| 1344 | |
| 1345 | if (offset < 3 || (offset + 4) > sec->size) |
| 1346 | return FALSE; |
| 1347 | |
| 1348 | val = bfd_get_8 (abfd, contents + offset - 3); |
| 1349 | if ((val & 0xfb) != 0x48) |
| 1350 | return FALSE; |
| 1351 | |
| 1352 | if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) |
| 1353 | return FALSE; |
| 1354 | |
| 1355 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 1356 | return (val & 0xc7) == 0x05; |
| 1357 | |
| 1358 | case R_X86_64_TLSDESC_CALL: |
| 1359 | /* Check transition from GDesc access model: |
| 1360 | call *x@tlsdesc(%rax) |
| 1361 | */ |
| 1362 | if (offset + 2 <= sec->size) |
| 1363 | { |
| 1364 | /* Make sure that it's a call *x@tlsdesc(%rax). */ |
| 1365 | static const unsigned char call[] = { 0xff, 0x10 }; |
| 1366 | return memcmp (contents + offset, call, 2) == 0; |
| 1367 | } |
| 1368 | |
| 1369 | return FALSE; |
| 1370 | |
| 1371 | default: |
| 1372 | abort (); |
| 1373 | } |
| 1374 | } |
| 1375 | |
| 1376 | /* Return TRUE if the TLS access transition is OK or no transition |
| 1377 | will be performed. Update R_TYPE if there is a transition. */ |
| 1378 | |
| 1379 | static bfd_boolean |
| 1380 | elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd, |
| 1381 | asection *sec, bfd_byte *contents, |
| 1382 | Elf_Internal_Shdr *symtab_hdr, |
| 1383 | struct elf_link_hash_entry **sym_hashes, |
| 1384 | unsigned int *r_type, int tls_type, |
| 1385 | const Elf_Internal_Rela *rel, |
| 1386 | const Elf_Internal_Rela *relend, |
| 1387 | struct elf_link_hash_entry *h, |
| 1388 | unsigned long r_symndx) |
| 1389 | { |
| 1390 | unsigned int from_type = *r_type; |
| 1391 | unsigned int to_type = from_type; |
| 1392 | bfd_boolean check = TRUE; |
| 1393 | |
| 1394 | /* Skip TLS transition for functions. */ |
| 1395 | if (h != NULL |
| 1396 | && (h->type == STT_FUNC |
| 1397 | || h->type == STT_GNU_IFUNC)) |
| 1398 | return TRUE; |
| 1399 | |
| 1400 | switch (from_type) |
| 1401 | { |
| 1402 | case R_X86_64_TLSGD: |
| 1403 | case R_X86_64_GOTPC32_TLSDESC: |
| 1404 | case R_X86_64_TLSDESC_CALL: |
| 1405 | case R_X86_64_GOTTPOFF: |
| 1406 | if (info->executable) |
| 1407 | { |
| 1408 | if (h == NULL) |
| 1409 | to_type = R_X86_64_TPOFF32; |
| 1410 | else |
| 1411 | to_type = R_X86_64_GOTTPOFF; |
| 1412 | } |
| 1413 | |
| 1414 | /* When we are called from elf_x86_64_relocate_section, |
| 1415 | CONTENTS isn't NULL and there may be additional transitions |
| 1416 | based on TLS_TYPE. */ |
| 1417 | if (contents != NULL) |
| 1418 | { |
| 1419 | unsigned int new_to_type = to_type; |
| 1420 | |
| 1421 | if (info->executable |
| 1422 | && h != NULL |
| 1423 | && h->dynindx == -1 |
| 1424 | && tls_type == GOT_TLS_IE) |
| 1425 | new_to_type = R_X86_64_TPOFF32; |
| 1426 | |
| 1427 | if (to_type == R_X86_64_TLSGD |
| 1428 | || to_type == R_X86_64_GOTPC32_TLSDESC |
| 1429 | || to_type == R_X86_64_TLSDESC_CALL) |
| 1430 | { |
| 1431 | if (tls_type == GOT_TLS_IE) |
| 1432 | new_to_type = R_X86_64_GOTTPOFF; |
| 1433 | } |
| 1434 | |
| 1435 | /* We checked the transition before when we were called from |
| 1436 | elf_x86_64_check_relocs. We only want to check the new |
| 1437 | transition which hasn't been checked before. */ |
| 1438 | check = new_to_type != to_type && from_type == to_type; |
| 1439 | to_type = new_to_type; |
| 1440 | } |
| 1441 | |
| 1442 | break; |
| 1443 | |
| 1444 | case R_X86_64_TLSLD: |
| 1445 | if (info->executable) |
| 1446 | to_type = R_X86_64_TPOFF32; |
| 1447 | break; |
| 1448 | |
| 1449 | default: |
| 1450 | return TRUE; |
| 1451 | } |
| 1452 | |
| 1453 | /* Return TRUE if there is no transition. */ |
| 1454 | if (from_type == to_type) |
| 1455 | return TRUE; |
| 1456 | |
| 1457 | /* Check if the transition can be performed. */ |
| 1458 | if (check |
| 1459 | && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents, |
| 1460 | symtab_hdr, sym_hashes, |
| 1461 | from_type, rel, relend)) |
| 1462 | { |
| 1463 | reloc_howto_type *from, *to; |
| 1464 | const char *name; |
| 1465 | |
| 1466 | from = elf_x86_64_rtype_to_howto (abfd, from_type); |
| 1467 | to = elf_x86_64_rtype_to_howto (abfd, to_type); |
| 1468 | |
| 1469 | if (h) |
| 1470 | name = h->root.root.string; |
| 1471 | else |
| 1472 | { |
| 1473 | struct elf_x86_64_link_hash_table *htab; |
| 1474 | |
| 1475 | htab = elf_x86_64_hash_table (info); |
| 1476 | if (htab == NULL) |
| 1477 | name = "*unknown*"; |
| 1478 | else |
| 1479 | { |
| 1480 | Elf_Internal_Sym *isym; |
| 1481 | |
| 1482 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1483 | abfd, r_symndx); |
| 1484 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); |
| 1485 | } |
| 1486 | } |
| 1487 | |
| 1488 | (*_bfd_error_handler) |
| 1489 | (_("%B: TLS transition from %s to %s against `%s' at 0x%lx " |
| 1490 | "in section `%A' failed"), |
| 1491 | abfd, sec, from->name, to->name, name, |
| 1492 | (unsigned long) rel->r_offset); |
| 1493 | bfd_set_error (bfd_error_bad_value); |
| 1494 | return FALSE; |
| 1495 | } |
| 1496 | |
| 1497 | *r_type = to_type; |
| 1498 | return TRUE; |
| 1499 | } |
| 1500 | |
| 1501 | /* Look through the relocs for a section during the first phase, and |
| 1502 | calculate needed space in the global offset table, procedure |
| 1503 | linkage table, and dynamic reloc sections. */ |
| 1504 | |
| 1505 | static bfd_boolean |
| 1506 | elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, |
| 1507 | asection *sec, |
| 1508 | const Elf_Internal_Rela *relocs) |
| 1509 | { |
| 1510 | struct elf_x86_64_link_hash_table *htab; |
| 1511 | Elf_Internal_Shdr *symtab_hdr; |
| 1512 | struct elf_link_hash_entry **sym_hashes; |
| 1513 | const Elf_Internal_Rela *rel; |
| 1514 | const Elf_Internal_Rela *rel_end; |
| 1515 | asection *sreloc; |
| 1516 | |
| 1517 | if (info->relocatable) |
| 1518 | return TRUE; |
| 1519 | |
| 1520 | BFD_ASSERT (is_x86_64_elf (abfd)); |
| 1521 | |
| 1522 | htab = elf_x86_64_hash_table (info); |
| 1523 | if (htab == NULL) |
| 1524 | return FALSE; |
| 1525 | |
| 1526 | symtab_hdr = &elf_symtab_hdr (abfd); |
| 1527 | sym_hashes = elf_sym_hashes (abfd); |
| 1528 | |
| 1529 | sreloc = NULL; |
| 1530 | |
| 1531 | rel_end = relocs + sec->reloc_count; |
| 1532 | for (rel = relocs; rel < rel_end; rel++) |
| 1533 | { |
| 1534 | unsigned int r_type; |
| 1535 | unsigned long r_symndx; |
| 1536 | struct elf_link_hash_entry *h; |
| 1537 | Elf_Internal_Sym *isym; |
| 1538 | const char *name; |
| 1539 | bfd_boolean size_reloc; |
| 1540 | |
| 1541 | r_symndx = htab->r_sym (rel->r_info); |
| 1542 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1543 | |
| 1544 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 1545 | { |
| 1546 | (*_bfd_error_handler) (_("%B: bad symbol index: %d"), |
| 1547 | abfd, r_symndx); |
| 1548 | return FALSE; |
| 1549 | } |
| 1550 | |
| 1551 | if (r_symndx < symtab_hdr->sh_info) |
| 1552 | { |
| 1553 | /* A local symbol. */ |
| 1554 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1555 | abfd, r_symndx); |
| 1556 | if (isym == NULL) |
| 1557 | return FALSE; |
| 1558 | |
| 1559 | /* Check relocation against local STT_GNU_IFUNC symbol. */ |
| 1560 | if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) |
| 1561 | { |
| 1562 | h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, |
| 1563 | TRUE); |
| 1564 | if (h == NULL) |
| 1565 | return FALSE; |
| 1566 | |
| 1567 | /* Fake a STT_GNU_IFUNC symbol. */ |
| 1568 | h->type = STT_GNU_IFUNC; |
| 1569 | h->def_regular = 1; |
| 1570 | h->ref_regular = 1; |
| 1571 | h->forced_local = 1; |
| 1572 | h->root.type = bfd_link_hash_defined; |
| 1573 | } |
| 1574 | else |
| 1575 | h = NULL; |
| 1576 | } |
| 1577 | else |
| 1578 | { |
| 1579 | isym = NULL; |
| 1580 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1581 | while (h->root.type == bfd_link_hash_indirect |
| 1582 | || h->root.type == bfd_link_hash_warning) |
| 1583 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1584 | } |
| 1585 | |
| 1586 | /* Check invalid x32 relocations. */ |
| 1587 | if (!ABI_64_P (abfd)) |
| 1588 | switch (r_type) |
| 1589 | { |
| 1590 | default: |
| 1591 | break; |
| 1592 | |
| 1593 | case R_X86_64_DTPOFF64: |
| 1594 | case R_X86_64_TPOFF64: |
| 1595 | case R_X86_64_PC64: |
| 1596 | case R_X86_64_GOTOFF64: |
| 1597 | case R_X86_64_GOT64: |
| 1598 | case R_X86_64_GOTPCREL64: |
| 1599 | case R_X86_64_GOTPC64: |
| 1600 | case R_X86_64_GOTPLT64: |
| 1601 | case R_X86_64_PLTOFF64: |
| 1602 | { |
| 1603 | if (h) |
| 1604 | name = h->root.root.string; |
| 1605 | else |
| 1606 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, |
| 1607 | NULL); |
| 1608 | (*_bfd_error_handler) |
| 1609 | (_("%B: relocation %s against symbol `%s' isn't " |
| 1610 | "supported in x32 mode"), abfd, |
| 1611 | x86_64_elf_howto_table[r_type].name, name); |
| 1612 | bfd_set_error (bfd_error_bad_value); |
| 1613 | return FALSE; |
| 1614 | } |
| 1615 | break; |
| 1616 | } |
| 1617 | |
| 1618 | if (h != NULL) |
| 1619 | { |
| 1620 | /* Create the ifunc sections for static executables. If we |
| 1621 | never see an indirect function symbol nor we are building |
| 1622 | a static executable, those sections will be empty and |
| 1623 | won't appear in output. */ |
| 1624 | switch (r_type) |
| 1625 | { |
| 1626 | default: |
| 1627 | break; |
| 1628 | |
| 1629 | case R_X86_64_PC32_BND: |
| 1630 | case R_X86_64_PLT32_BND: |
| 1631 | /* MPX PLT is supported only if elf_x86_64_arch_bed |
| 1632 | is used in 64-bit mode. */ |
| 1633 | if (ABI_64_P (abfd) |
| 1634 | && (get_elf_x86_64_backend_data (abfd) |
| 1635 | == &elf_x86_64_arch_bed)) |
| 1636 | { |
| 1637 | elf_x86_64_hash_entry (h)->has_bnd_reloc = TRUE; |
| 1638 | |
| 1639 | /* Create the second PLT for Intel MPX support. */ |
| 1640 | if (htab->plt_bnd == NULL) |
| 1641 | { |
| 1642 | unsigned int plt_bnd_align; |
| 1643 | const struct elf_backend_data *bed; |
| 1644 | |
| 1645 | bed = get_elf_backend_data (info->output_bfd); |
| 1646 | switch (sizeof (elf_x86_64_bnd_plt2_entry)) |
| 1647 | { |
| 1648 | case 8: |
| 1649 | plt_bnd_align = 3; |
| 1650 | break; |
| 1651 | case 16: |
| 1652 | plt_bnd_align = 4; |
| 1653 | break; |
| 1654 | default: |
| 1655 | abort (); |
| 1656 | } |
| 1657 | |
| 1658 | if (htab->elf.dynobj == NULL) |
| 1659 | htab->elf.dynobj = abfd; |
| 1660 | htab->plt_bnd |
| 1661 | = bfd_make_section_anyway_with_flags (htab->elf.dynobj, |
| 1662 | ".plt.bnd", |
| 1663 | (bed->dynamic_sec_flags |
| 1664 | | SEC_ALLOC |
| 1665 | | SEC_CODE |
| 1666 | | SEC_LOAD |
| 1667 | | SEC_READONLY)); |
| 1668 | if (htab->plt_bnd == NULL |
| 1669 | || !bfd_set_section_alignment (htab->elf.dynobj, |
| 1670 | htab->plt_bnd, |
| 1671 | plt_bnd_align)) |
| 1672 | return FALSE; |
| 1673 | } |
| 1674 | } |
| 1675 | |
| 1676 | case R_X86_64_32S: |
| 1677 | case R_X86_64_32: |
| 1678 | case R_X86_64_64: |
| 1679 | case R_X86_64_PC32: |
| 1680 | case R_X86_64_PC64: |
| 1681 | case R_X86_64_PLT32: |
| 1682 | case R_X86_64_GOTPCREL: |
| 1683 | case R_X86_64_GOTPCREL64: |
| 1684 | if (htab->elf.dynobj == NULL) |
| 1685 | htab->elf.dynobj = abfd; |
| 1686 | if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info)) |
| 1687 | return FALSE; |
| 1688 | break; |
| 1689 | } |
| 1690 | |
| 1691 | /* It is referenced by a non-shared object. */ |
| 1692 | h->ref_regular = 1; |
| 1693 | h->root.non_ir_ref = 1; |
| 1694 | } |
| 1695 | |
| 1696 | if (! elf_x86_64_tls_transition (info, abfd, sec, NULL, |
| 1697 | symtab_hdr, sym_hashes, |
| 1698 | &r_type, GOT_UNKNOWN, |
| 1699 | rel, rel_end, h, r_symndx)) |
| 1700 | return FALSE; |
| 1701 | |
| 1702 | switch (r_type) |
| 1703 | { |
| 1704 | case R_X86_64_TLSLD: |
| 1705 | htab->tls_ld_got.refcount += 1; |
| 1706 | goto create_got; |
| 1707 | |
| 1708 | case R_X86_64_TPOFF32: |
| 1709 | if (!info->executable && ABI_64_P (abfd)) |
| 1710 | { |
| 1711 | if (h) |
| 1712 | name = h->root.root.string; |
| 1713 | else |
| 1714 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, |
| 1715 | NULL); |
| 1716 | (*_bfd_error_handler) |
| 1717 | (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), |
| 1718 | abfd, |
| 1719 | x86_64_elf_howto_table[r_type].name, name); |
| 1720 | bfd_set_error (bfd_error_bad_value); |
| 1721 | return FALSE; |
| 1722 | } |
| 1723 | break; |
| 1724 | |
| 1725 | case R_X86_64_GOTTPOFF: |
| 1726 | if (!info->executable) |
| 1727 | info->flags |= DF_STATIC_TLS; |
| 1728 | /* Fall through */ |
| 1729 | |
| 1730 | case R_X86_64_GOT32: |
| 1731 | case R_X86_64_GOTPCREL: |
| 1732 | case R_X86_64_TLSGD: |
| 1733 | case R_X86_64_GOT64: |
| 1734 | case R_X86_64_GOTPCREL64: |
| 1735 | case R_X86_64_GOTPLT64: |
| 1736 | case R_X86_64_GOTPC32_TLSDESC: |
| 1737 | case R_X86_64_TLSDESC_CALL: |
| 1738 | /* This symbol requires a global offset table entry. */ |
| 1739 | { |
| 1740 | int tls_type, old_tls_type; |
| 1741 | |
| 1742 | switch (r_type) |
| 1743 | { |
| 1744 | default: tls_type = GOT_NORMAL; break; |
| 1745 | case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break; |
| 1746 | case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break; |
| 1747 | case R_X86_64_GOTPC32_TLSDESC: |
| 1748 | case R_X86_64_TLSDESC_CALL: |
| 1749 | tls_type = GOT_TLS_GDESC; break; |
| 1750 | } |
| 1751 | |
| 1752 | if (h != NULL) |
| 1753 | { |
| 1754 | if (r_type == R_X86_64_GOTPLT64) |
| 1755 | { |
| 1756 | /* This relocation indicates that we also need |
| 1757 | a PLT entry, as this is a function. We don't need |
| 1758 | a PLT entry for local symbols. */ |
| 1759 | h->needs_plt = 1; |
| 1760 | h->plt.refcount += 1; |
| 1761 | } |
| 1762 | h->got.refcount += 1; |
| 1763 | old_tls_type = elf_x86_64_hash_entry (h)->tls_type; |
| 1764 | } |
| 1765 | else |
| 1766 | { |
| 1767 | bfd_signed_vma *local_got_refcounts; |
| 1768 | |
| 1769 | /* This is a global offset table entry for a local symbol. */ |
| 1770 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1771 | if (local_got_refcounts == NULL) |
| 1772 | { |
| 1773 | bfd_size_type size; |
| 1774 | |
| 1775 | size = symtab_hdr->sh_info; |
| 1776 | size *= sizeof (bfd_signed_vma) |
| 1777 | + sizeof (bfd_vma) + sizeof (char); |
| 1778 | local_got_refcounts = ((bfd_signed_vma *) |
| 1779 | bfd_zalloc (abfd, size)); |
| 1780 | if (local_got_refcounts == NULL) |
| 1781 | return FALSE; |
| 1782 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 1783 | elf_x86_64_local_tlsdesc_gotent (abfd) |
| 1784 | = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); |
| 1785 | elf_x86_64_local_got_tls_type (abfd) |
| 1786 | = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); |
| 1787 | } |
| 1788 | local_got_refcounts[r_symndx] += 1; |
| 1789 | old_tls_type |
| 1790 | = elf_x86_64_local_got_tls_type (abfd) [r_symndx]; |
| 1791 | } |
| 1792 | |
| 1793 | /* If a TLS symbol is accessed using IE at least once, |
| 1794 | there is no point to use dynamic model for it. */ |
| 1795 | if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN |
| 1796 | && (! GOT_TLS_GD_ANY_P (old_tls_type) |
| 1797 | || tls_type != GOT_TLS_IE)) |
| 1798 | { |
| 1799 | if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type)) |
| 1800 | tls_type = old_tls_type; |
| 1801 | else if (GOT_TLS_GD_ANY_P (old_tls_type) |
| 1802 | && GOT_TLS_GD_ANY_P (tls_type)) |
| 1803 | tls_type |= old_tls_type; |
| 1804 | else |
| 1805 | { |
| 1806 | if (h) |
| 1807 | name = h->root.root.string; |
| 1808 | else |
| 1809 | name = bfd_elf_sym_name (abfd, symtab_hdr, |
| 1810 | isym, NULL); |
| 1811 | (*_bfd_error_handler) |
| 1812 | (_("%B: '%s' accessed both as normal and thread local symbol"), |
| 1813 | abfd, name); |
| 1814 | bfd_set_error (bfd_error_bad_value); |
| 1815 | return FALSE; |
| 1816 | } |
| 1817 | } |
| 1818 | |
| 1819 | if (old_tls_type != tls_type) |
| 1820 | { |
| 1821 | if (h != NULL) |
| 1822 | elf_x86_64_hash_entry (h)->tls_type = tls_type; |
| 1823 | else |
| 1824 | elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type; |
| 1825 | } |
| 1826 | } |
| 1827 | /* Fall through */ |
| 1828 | |
| 1829 | case R_X86_64_GOTOFF64: |
| 1830 | case R_X86_64_GOTPC32: |
| 1831 | case R_X86_64_GOTPC64: |
| 1832 | create_got: |
| 1833 | if (htab->elf.sgot == NULL) |
| 1834 | { |
| 1835 | if (htab->elf.dynobj == NULL) |
| 1836 | htab->elf.dynobj = abfd; |
| 1837 | if (!_bfd_elf_create_got_section (htab->elf.dynobj, |
| 1838 | info)) |
| 1839 | return FALSE; |
| 1840 | } |
| 1841 | break; |
| 1842 | |
| 1843 | case R_X86_64_PLT32: |
| 1844 | case R_X86_64_PLT32_BND: |
| 1845 | /* This symbol requires a procedure linkage table entry. We |
| 1846 | actually build the entry in adjust_dynamic_symbol, |
| 1847 | because this might be a case of linking PIC code which is |
| 1848 | never referenced by a dynamic object, in which case we |
| 1849 | don't need to generate a procedure linkage table entry |
| 1850 | after all. */ |
| 1851 | |
| 1852 | /* If this is a local symbol, we resolve it directly without |
| 1853 | creating a procedure linkage table entry. */ |
| 1854 | if (h == NULL) |
| 1855 | continue; |
| 1856 | |
| 1857 | h->needs_plt = 1; |
| 1858 | h->plt.refcount += 1; |
| 1859 | break; |
| 1860 | |
| 1861 | case R_X86_64_PLTOFF64: |
| 1862 | /* This tries to form the 'address' of a function relative |
| 1863 | to GOT. For global symbols we need a PLT entry. */ |
| 1864 | if (h != NULL) |
| 1865 | { |
| 1866 | h->needs_plt = 1; |
| 1867 | h->plt.refcount += 1; |
| 1868 | } |
| 1869 | goto create_got; |
| 1870 | |
| 1871 | case R_X86_64_SIZE32: |
| 1872 | case R_X86_64_SIZE64: |
| 1873 | size_reloc = TRUE; |
| 1874 | goto do_size; |
| 1875 | |
| 1876 | case R_X86_64_32: |
| 1877 | if (!ABI_64_P (abfd)) |
| 1878 | goto pointer; |
| 1879 | case R_X86_64_8: |
| 1880 | case R_X86_64_16: |
| 1881 | case R_X86_64_32S: |
| 1882 | /* Let's help debug shared library creation. These relocs |
| 1883 | cannot be used in shared libs. Don't error out for |
| 1884 | sections we don't care about, such as debug sections or |
| 1885 | non-constant sections. */ |
| 1886 | if (info->shared |
| 1887 | && (sec->flags & SEC_ALLOC) != 0 |
| 1888 | && (sec->flags & SEC_READONLY) != 0) |
| 1889 | { |
| 1890 | if (h) |
| 1891 | name = h->root.root.string; |
| 1892 | else |
| 1893 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); |
| 1894 | (*_bfd_error_handler) |
| 1895 | (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), |
| 1896 | abfd, x86_64_elf_howto_table[r_type].name, name); |
| 1897 | bfd_set_error (bfd_error_bad_value); |
| 1898 | return FALSE; |
| 1899 | } |
| 1900 | /* Fall through. */ |
| 1901 | |
| 1902 | case R_X86_64_PC8: |
| 1903 | case R_X86_64_PC16: |
| 1904 | case R_X86_64_PC32: |
| 1905 | case R_X86_64_PC32_BND: |
| 1906 | case R_X86_64_PC64: |
| 1907 | case R_X86_64_64: |
| 1908 | pointer: |
| 1909 | if (h != NULL && info->executable) |
| 1910 | { |
| 1911 | /* If this reloc is in a read-only section, we might |
| 1912 | need a copy reloc. We can't check reliably at this |
| 1913 | stage whether the section is read-only, as input |
| 1914 | sections have not yet been mapped to output sections. |
| 1915 | Tentatively set the flag for now, and correct in |
| 1916 | adjust_dynamic_symbol. */ |
| 1917 | h->non_got_ref = 1; |
| 1918 | |
| 1919 | /* We may need a .plt entry if the function this reloc |
| 1920 | refers to is in a shared lib. */ |
| 1921 | h->plt.refcount += 1; |
| 1922 | if (r_type != R_X86_64_PC32 |
| 1923 | && r_type != R_X86_64_PC32_BND |
| 1924 | && r_type != R_X86_64_PC64) |
| 1925 | h->pointer_equality_needed = 1; |
| 1926 | } |
| 1927 | |
| 1928 | size_reloc = FALSE; |
| 1929 | do_size: |
| 1930 | /* If we are creating a shared library, and this is a reloc |
| 1931 | against a global symbol, or a non PC relative reloc |
| 1932 | against a local symbol, then we need to copy the reloc |
| 1933 | into the shared library. However, if we are linking with |
| 1934 | -Bsymbolic, we do not need to copy a reloc against a |
| 1935 | global symbol which is defined in an object we are |
| 1936 | including in the link (i.e., DEF_REGULAR is set). At |
| 1937 | this point we have not seen all the input files, so it is |
| 1938 | possible that DEF_REGULAR is not set now but will be set |
| 1939 | later (it is never cleared). In case of a weak definition, |
| 1940 | DEF_REGULAR may be cleared later by a strong definition in |
| 1941 | a shared library. We account for that possibility below by |
| 1942 | storing information in the relocs_copied field of the hash |
| 1943 | table entry. A similar situation occurs when creating |
| 1944 | shared libraries and symbol visibility changes render the |
| 1945 | symbol local. |
| 1946 | |
| 1947 | If on the other hand, we are creating an executable, we |
| 1948 | may need to keep relocations for symbols satisfied by a |
| 1949 | dynamic library if we manage to avoid copy relocs for the |
| 1950 | symbol. */ |
| 1951 | if ((info->shared |
| 1952 | && (sec->flags & SEC_ALLOC) != 0 |
| 1953 | && (! IS_X86_64_PCREL_TYPE (r_type) |
| 1954 | || (h != NULL |
| 1955 | && (! SYMBOLIC_BIND (info, h) |
| 1956 | || h->root.type == bfd_link_hash_defweak |
| 1957 | || !h->def_regular)))) |
| 1958 | || (ELIMINATE_COPY_RELOCS |
| 1959 | && !info->shared |
| 1960 | && (sec->flags & SEC_ALLOC) != 0 |
| 1961 | && h != NULL |
| 1962 | && (h->root.type == bfd_link_hash_defweak |
| 1963 | || !h->def_regular))) |
| 1964 | { |
| 1965 | struct elf_dyn_relocs *p; |
| 1966 | struct elf_dyn_relocs **head; |
| 1967 | |
| 1968 | /* We must copy these reloc types into the output file. |
| 1969 | Create a reloc section in dynobj and make room for |
| 1970 | this reloc. */ |
| 1971 | if (sreloc == NULL) |
| 1972 | { |
| 1973 | if (htab->elf.dynobj == NULL) |
| 1974 | htab->elf.dynobj = abfd; |
| 1975 | |
| 1976 | sreloc = _bfd_elf_make_dynamic_reloc_section |
| 1977 | (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2, |
| 1978 | abfd, /*rela?*/ TRUE); |
| 1979 | |
| 1980 | if (sreloc == NULL) |
| 1981 | return FALSE; |
| 1982 | } |
| 1983 | |
| 1984 | /* If this is a global symbol, we count the number of |
| 1985 | relocations we need for this symbol. */ |
| 1986 | if (h != NULL) |
| 1987 | { |
| 1988 | head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs; |
| 1989 | } |
| 1990 | else |
| 1991 | { |
| 1992 | /* Track dynamic relocs needed for local syms too. |
| 1993 | We really need local syms available to do this |
| 1994 | easily. Oh well. */ |
| 1995 | asection *s; |
| 1996 | void **vpp; |
| 1997 | |
| 1998 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1999 | abfd, r_symndx); |
| 2000 | if (isym == NULL) |
| 2001 | return FALSE; |
| 2002 | |
| 2003 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 2004 | if (s == NULL) |
| 2005 | s = sec; |
| 2006 | |
| 2007 | /* Beware of type punned pointers vs strict aliasing |
| 2008 | rules. */ |
| 2009 | vpp = &(elf_section_data (s)->local_dynrel); |
| 2010 | head = (struct elf_dyn_relocs **)vpp; |
| 2011 | } |
| 2012 | |
| 2013 | p = *head; |
| 2014 | if (p == NULL || p->sec != sec) |
| 2015 | { |
| 2016 | bfd_size_type amt = sizeof *p; |
| 2017 | |
| 2018 | p = ((struct elf_dyn_relocs *) |
| 2019 | bfd_alloc (htab->elf.dynobj, amt)); |
| 2020 | if (p == NULL) |
| 2021 | return FALSE; |
| 2022 | p->next = *head; |
| 2023 | *head = p; |
| 2024 | p->sec = sec; |
| 2025 | p->count = 0; |
| 2026 | p->pc_count = 0; |
| 2027 | } |
| 2028 | |
| 2029 | p->count += 1; |
| 2030 | /* Count size relocation as PC-relative relocation. */ |
| 2031 | if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc) |
| 2032 | p->pc_count += 1; |
| 2033 | } |
| 2034 | break; |
| 2035 | |
| 2036 | /* This relocation describes the C++ object vtable hierarchy. |
| 2037 | Reconstruct it for later use during GC. */ |
| 2038 | case R_X86_64_GNU_VTINHERIT: |
| 2039 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 2040 | return FALSE; |
| 2041 | break; |
| 2042 | |
| 2043 | /* This relocation describes which C++ vtable entries are actually |
| 2044 | used. Record for later use during GC. */ |
| 2045 | case R_X86_64_GNU_VTENTRY: |
| 2046 | BFD_ASSERT (h != NULL); |
| 2047 | if (h != NULL |
| 2048 | && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 2049 | return FALSE; |
| 2050 | break; |
| 2051 | |
| 2052 | default: |
| 2053 | break; |
| 2054 | } |
| 2055 | } |
| 2056 | |
| 2057 | return TRUE; |
| 2058 | } |
| 2059 | |
| 2060 | /* Return the section that should be marked against GC for a given |
| 2061 | relocation. */ |
| 2062 | |
| 2063 | static asection * |
| 2064 | elf_x86_64_gc_mark_hook (asection *sec, |
| 2065 | struct bfd_link_info *info, |
| 2066 | Elf_Internal_Rela *rel, |
| 2067 | struct elf_link_hash_entry *h, |
| 2068 | Elf_Internal_Sym *sym) |
| 2069 | { |
| 2070 | if (h != NULL) |
| 2071 | switch (ELF32_R_TYPE (rel->r_info)) |
| 2072 | { |
| 2073 | case R_X86_64_GNU_VTINHERIT: |
| 2074 | case R_X86_64_GNU_VTENTRY: |
| 2075 | return NULL; |
| 2076 | } |
| 2077 | |
| 2078 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 2079 | } |
| 2080 | |
| 2081 | /* Update the got entry reference counts for the section being removed. */ |
| 2082 | |
| 2083 | static bfd_boolean |
| 2084 | elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, |
| 2085 | asection *sec, |
| 2086 | const Elf_Internal_Rela *relocs) |
| 2087 | { |
| 2088 | struct elf_x86_64_link_hash_table *htab; |
| 2089 | Elf_Internal_Shdr *symtab_hdr; |
| 2090 | struct elf_link_hash_entry **sym_hashes; |
| 2091 | bfd_signed_vma *local_got_refcounts; |
| 2092 | const Elf_Internal_Rela *rel, *relend; |
| 2093 | |
| 2094 | if (info->relocatable) |
| 2095 | return TRUE; |
| 2096 | |
| 2097 | htab = elf_x86_64_hash_table (info); |
| 2098 | if (htab == NULL) |
| 2099 | return FALSE; |
| 2100 | |
| 2101 | elf_section_data (sec)->local_dynrel = NULL; |
| 2102 | |
| 2103 | symtab_hdr = &elf_symtab_hdr (abfd); |
| 2104 | sym_hashes = elf_sym_hashes (abfd); |
| 2105 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 2106 | |
| 2107 | htab = elf_x86_64_hash_table (info); |
| 2108 | relend = relocs + sec->reloc_count; |
| 2109 | for (rel = relocs; rel < relend; rel++) |
| 2110 | { |
| 2111 | unsigned long r_symndx; |
| 2112 | unsigned int r_type; |
| 2113 | struct elf_link_hash_entry *h = NULL; |
| 2114 | |
| 2115 | r_symndx = htab->r_sym (rel->r_info); |
| 2116 | if (r_symndx >= symtab_hdr->sh_info) |
| 2117 | { |
| 2118 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 2119 | while (h->root.type == bfd_link_hash_indirect |
| 2120 | || h->root.type == bfd_link_hash_warning) |
| 2121 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2122 | } |
| 2123 | else |
| 2124 | { |
| 2125 | /* A local symbol. */ |
| 2126 | Elf_Internal_Sym *isym; |
| 2127 | |
| 2128 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 2129 | abfd, r_symndx); |
| 2130 | |
| 2131 | /* Check relocation against local STT_GNU_IFUNC symbol. */ |
| 2132 | if (isym != NULL |
| 2133 | && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) |
| 2134 | { |
| 2135 | h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE); |
| 2136 | if (h == NULL) |
| 2137 | abort (); |
| 2138 | } |
| 2139 | } |
| 2140 | |
| 2141 | if (h) |
| 2142 | { |
| 2143 | struct elf_x86_64_link_hash_entry *eh; |
| 2144 | struct elf_dyn_relocs **pp; |
| 2145 | struct elf_dyn_relocs *p; |
| 2146 | |
| 2147 | eh = (struct elf_x86_64_link_hash_entry *) h; |
| 2148 | |
| 2149 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| 2150 | if (p->sec == sec) |
| 2151 | { |
| 2152 | /* Everything must go for SEC. */ |
| 2153 | *pp = p->next; |
| 2154 | break; |
| 2155 | } |
| 2156 | } |
| 2157 | |
| 2158 | r_type = ELF32_R_TYPE (rel->r_info); |
| 2159 | if (! elf_x86_64_tls_transition (info, abfd, sec, NULL, |
| 2160 | symtab_hdr, sym_hashes, |
| 2161 | &r_type, GOT_UNKNOWN, |
| 2162 | rel, relend, h, r_symndx)) |
| 2163 | return FALSE; |
| 2164 | |
| 2165 | switch (r_type) |
| 2166 | { |
| 2167 | case R_X86_64_TLSLD: |
| 2168 | if (htab->tls_ld_got.refcount > 0) |
| 2169 | htab->tls_ld_got.refcount -= 1; |
| 2170 | break; |
| 2171 | |
| 2172 | case R_X86_64_TLSGD: |
| 2173 | case R_X86_64_GOTPC32_TLSDESC: |
| 2174 | case R_X86_64_TLSDESC_CALL: |
| 2175 | case R_X86_64_GOTTPOFF: |
| 2176 | case R_X86_64_GOT32: |
| 2177 | case R_X86_64_GOTPCREL: |
| 2178 | case R_X86_64_GOT64: |
| 2179 | case R_X86_64_GOTPCREL64: |
| 2180 | case R_X86_64_GOTPLT64: |
| 2181 | if (h != NULL) |
| 2182 | { |
| 2183 | if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0) |
| 2184 | h->plt.refcount -= 1; |
| 2185 | if (h->got.refcount > 0) |
| 2186 | h->got.refcount -= 1; |
| 2187 | if (h->type == STT_GNU_IFUNC) |
| 2188 | { |
| 2189 | if (h->plt.refcount > 0) |
| 2190 | h->plt.refcount -= 1; |
| 2191 | } |
| 2192 | } |
| 2193 | else if (local_got_refcounts != NULL) |
| 2194 | { |
| 2195 | if (local_got_refcounts[r_symndx] > 0) |
| 2196 | local_got_refcounts[r_symndx] -= 1; |
| 2197 | } |
| 2198 | break; |
| 2199 | |
| 2200 | case R_X86_64_8: |
| 2201 | case R_X86_64_16: |
| 2202 | case R_X86_64_32: |
| 2203 | case R_X86_64_64: |
| 2204 | case R_X86_64_32S: |
| 2205 | case R_X86_64_PC8: |
| 2206 | case R_X86_64_PC16: |
| 2207 | case R_X86_64_PC32: |
| 2208 | case R_X86_64_PC32_BND: |
| 2209 | case R_X86_64_PC64: |
| 2210 | case R_X86_64_SIZE32: |
| 2211 | case R_X86_64_SIZE64: |
| 2212 | if (info->shared |
| 2213 | && (h == NULL || h->type != STT_GNU_IFUNC)) |
| 2214 | break; |
| 2215 | /* Fall thru */ |
| 2216 | |
| 2217 | case R_X86_64_PLT32: |
| 2218 | case R_X86_64_PLT32_BND: |
| 2219 | case R_X86_64_PLTOFF64: |
| 2220 | if (h != NULL) |
| 2221 | { |
| 2222 | if (h->plt.refcount > 0) |
| 2223 | h->plt.refcount -= 1; |
| 2224 | } |
| 2225 | break; |
| 2226 | |
| 2227 | default: |
| 2228 | break; |
| 2229 | } |
| 2230 | } |
| 2231 | |
| 2232 | return TRUE; |
| 2233 | } |
| 2234 | |
| 2235 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 2236 | regular object. The current definition is in some section of the |
| 2237 | dynamic object, but we're not including those sections. We have to |
| 2238 | change the definition to something the rest of the link can |
| 2239 | understand. */ |
| 2240 | |
| 2241 | static bfd_boolean |
| 2242 | elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info, |
| 2243 | struct elf_link_hash_entry *h) |
| 2244 | { |
| 2245 | struct elf_x86_64_link_hash_table *htab; |
| 2246 | asection *s; |
| 2247 | struct elf_x86_64_link_hash_entry *eh; |
| 2248 | struct elf_dyn_relocs *p; |
| 2249 | |
| 2250 | /* STT_GNU_IFUNC symbol must go through PLT. */ |
| 2251 | if (h->type == STT_GNU_IFUNC) |
| 2252 | { |
| 2253 | /* All local STT_GNU_IFUNC references must be treate as local |
| 2254 | calls via local PLT. */ |
| 2255 | if (h->ref_regular |
| 2256 | && SYMBOL_CALLS_LOCAL (info, h)) |
| 2257 | { |
| 2258 | bfd_size_type pc_count = 0, count = 0; |
| 2259 | struct elf_dyn_relocs **pp; |
| 2260 | |
| 2261 | eh = (struct elf_x86_64_link_hash_entry *) h; |
| 2262 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 2263 | { |
| 2264 | pc_count += p->pc_count; |
| 2265 | p->count -= p->pc_count; |
| 2266 | p->pc_count = 0; |
| 2267 | count += p->count; |
| 2268 | if (p->count == 0) |
| 2269 | *pp = p->next; |
| 2270 | else |
| 2271 | pp = &p->next; |
| 2272 | } |
| 2273 | |
| 2274 | if (pc_count || count) |
| 2275 | { |
| 2276 | h->needs_plt = 1; |
| 2277 | h->non_got_ref = 1; |
| 2278 | if (h->plt.refcount <= 0) |
| 2279 | h->plt.refcount = 1; |
| 2280 | else |
| 2281 | h->plt.refcount += 1; |
| 2282 | } |
| 2283 | } |
| 2284 | |
| 2285 | if (h->plt.refcount <= 0) |
| 2286 | { |
| 2287 | h->plt.offset = (bfd_vma) -1; |
| 2288 | h->needs_plt = 0; |
| 2289 | } |
| 2290 | return TRUE; |
| 2291 | } |
| 2292 | |
| 2293 | /* If this is a function, put it in the procedure linkage table. We |
| 2294 | will fill in the contents of the procedure linkage table later, |
| 2295 | when we know the address of the .got section. */ |
| 2296 | if (h->type == STT_FUNC |
| 2297 | || h->needs_plt) |
| 2298 | { |
| 2299 | if (h->plt.refcount <= 0 |
| 2300 | || SYMBOL_CALLS_LOCAL (info, h) |
| 2301 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 2302 | && h->root.type == bfd_link_hash_undefweak)) |
| 2303 | { |
| 2304 | /* This case can occur if we saw a PLT32 reloc in an input |
| 2305 | file, but the symbol was never referred to by a dynamic |
| 2306 | object, or if all references were garbage collected. In |
| 2307 | such a case, we don't actually need to build a procedure |
| 2308 | linkage table, and we can just do a PC32 reloc instead. */ |
| 2309 | h->plt.offset = (bfd_vma) -1; |
| 2310 | h->needs_plt = 0; |
| 2311 | } |
| 2312 | |
| 2313 | return TRUE; |
| 2314 | } |
| 2315 | else |
| 2316 | /* It's possible that we incorrectly decided a .plt reloc was |
| 2317 | needed for an R_X86_64_PC32 reloc to a non-function sym in |
| 2318 | check_relocs. We can't decide accurately between function and |
| 2319 | non-function syms in check-relocs; Objects loaded later in |
| 2320 | the link may change h->type. So fix it now. */ |
| 2321 | h->plt.offset = (bfd_vma) -1; |
| 2322 | |
| 2323 | /* If this is a weak symbol, and there is a real definition, the |
| 2324 | processor independent code will have arranged for us to see the |
| 2325 | real definition first, and we can just use the same value. */ |
| 2326 | if (h->u.weakdef != NULL) |
| 2327 | { |
| 2328 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined |
| 2329 | || h->u.weakdef->root.type == bfd_link_hash_defweak); |
| 2330 | h->root.u.def.section = h->u.weakdef->root.u.def.section; |
| 2331 | h->root.u.def.value = h->u.weakdef->root.u.def.value; |
| 2332 | if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) |
| 2333 | h->non_got_ref = h->u.weakdef->non_got_ref; |
| 2334 | return TRUE; |
| 2335 | } |
| 2336 | |
| 2337 | /* This is a reference to a symbol defined by a dynamic object which |
| 2338 | is not a function. */ |
| 2339 | |
| 2340 | /* If we are creating a shared library, we must presume that the |
| 2341 | only references to the symbol are via the global offset table. |
| 2342 | For such cases we need not do anything here; the relocations will |
| 2343 | be handled correctly by relocate_section. */ |
| 2344 | if (info->shared) |
| 2345 | return TRUE; |
| 2346 | |
| 2347 | /* If there are no references to this symbol that do not use the |
| 2348 | GOT, we don't need to generate a copy reloc. */ |
| 2349 | if (!h->non_got_ref) |
| 2350 | return TRUE; |
| 2351 | |
| 2352 | /* If -z nocopyreloc was given, we won't generate them either. */ |
| 2353 | if (info->nocopyreloc) |
| 2354 | { |
| 2355 | h->non_got_ref = 0; |
| 2356 | return TRUE; |
| 2357 | } |
| 2358 | |
| 2359 | if (ELIMINATE_COPY_RELOCS) |
| 2360 | { |
| 2361 | eh = (struct elf_x86_64_link_hash_entry *) h; |
| 2362 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 2363 | { |
| 2364 | s = p->sec->output_section; |
| 2365 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 2366 | break; |
| 2367 | } |
| 2368 | |
| 2369 | /* If we didn't find any dynamic relocs in read-only sections, then |
| 2370 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
| 2371 | if (p == NULL) |
| 2372 | { |
| 2373 | h->non_got_ref = 0; |
| 2374 | return TRUE; |
| 2375 | } |
| 2376 | } |
| 2377 | |
| 2378 | /* We must allocate the symbol in our .dynbss section, which will |
| 2379 | become part of the .bss section of the executable. There will be |
| 2380 | an entry for this symbol in the .dynsym section. The dynamic |
| 2381 | object will contain position independent code, so all references |
| 2382 | from the dynamic object to this symbol will go through the global |
| 2383 | offset table. The dynamic linker will use the .dynsym entry to |
| 2384 | determine the address it must put in the global offset table, so |
| 2385 | both the dynamic object and the regular object will refer to the |
| 2386 | same memory location for the variable. */ |
| 2387 | |
| 2388 | htab = elf_x86_64_hash_table (info); |
| 2389 | if (htab == NULL) |
| 2390 | return FALSE; |
| 2391 | |
| 2392 | /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker |
| 2393 | to copy the initial value out of the dynamic object and into the |
| 2394 | runtime process image. */ |
| 2395 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) |
| 2396 | { |
| 2397 | const struct elf_backend_data *bed; |
| 2398 | bed = get_elf_backend_data (info->output_bfd); |
| 2399 | htab->srelbss->size += bed->s->sizeof_rela; |
| 2400 | h->needs_copy = 1; |
| 2401 | } |
| 2402 | |
| 2403 | s = htab->sdynbss; |
| 2404 | |
| 2405 | return _bfd_elf_adjust_dynamic_copy (h, s); |
| 2406 | } |
| 2407 | |
| 2408 | /* Allocate space in .plt, .got and associated reloc sections for |
| 2409 | dynamic relocs. */ |
| 2410 | |
| 2411 | static bfd_boolean |
| 2412 | elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) |
| 2413 | { |
| 2414 | struct bfd_link_info *info; |
| 2415 | struct elf_x86_64_link_hash_table *htab; |
| 2416 | struct elf_x86_64_link_hash_entry *eh; |
| 2417 | struct elf_dyn_relocs *p; |
| 2418 | const struct elf_backend_data *bed; |
| 2419 | unsigned int plt_entry_size; |
| 2420 | |
| 2421 | if (h->root.type == bfd_link_hash_indirect) |
| 2422 | return TRUE; |
| 2423 | |
| 2424 | eh = (struct elf_x86_64_link_hash_entry *) h; |
| 2425 | |
| 2426 | info = (struct bfd_link_info *) inf; |
| 2427 | htab = elf_x86_64_hash_table (info); |
| 2428 | if (htab == NULL) |
| 2429 | return FALSE; |
| 2430 | bed = get_elf_backend_data (info->output_bfd); |
| 2431 | plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd); |
| 2432 | |
| 2433 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it |
| 2434 | here if it is defined and referenced in a non-shared object. */ |
| 2435 | if (h->type == STT_GNU_IFUNC |
| 2436 | && h->def_regular) |
| 2437 | { |
| 2438 | if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h, |
| 2439 | &eh->dyn_relocs, |
| 2440 | plt_entry_size, |
| 2441 | plt_entry_size, |
| 2442 | GOT_ENTRY_SIZE)) |
| 2443 | { |
| 2444 | asection *s = htab->plt_bnd; |
| 2445 | if (h->plt.offset != (bfd_vma) -1 && s != NULL) |
| 2446 | { |
| 2447 | /* Use the .plt.bnd section if it is created. */ |
| 2448 | eh->plt_bnd.offset = s->size; |
| 2449 | |
| 2450 | /* Make room for this entry in the .plt.bnd section. */ |
| 2451 | s->size += sizeof (elf_x86_64_legacy_plt2_entry); |
| 2452 | } |
| 2453 | |
| 2454 | return TRUE; |
| 2455 | } |
| 2456 | else |
| 2457 | return FALSE; |
| 2458 | } |
| 2459 | else if (htab->elf.dynamic_sections_created |
| 2460 | && h->plt.refcount > 0) |
| 2461 | { |
| 2462 | /* Make sure this symbol is output as a dynamic symbol. |
| 2463 | Undefined weak syms won't yet be marked as dynamic. */ |
| 2464 | if (h->dynindx == -1 |
| 2465 | && !h->forced_local) |
| 2466 | { |
| 2467 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2468 | return FALSE; |
| 2469 | } |
| 2470 | |
| 2471 | if (info->shared |
| 2472 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) |
| 2473 | { |
| 2474 | asection *s = htab->elf.splt; |
| 2475 | asection *bnd_s = htab->plt_bnd; |
| 2476 | |
| 2477 | /* If this is the first .plt entry, make room for the special |
| 2478 | first entry. */ |
| 2479 | if (s->size == 0) |
| 2480 | s->size = plt_entry_size; |
| 2481 | |
| 2482 | h->plt.offset = s->size; |
| 2483 | if (bnd_s) |
| 2484 | eh->plt_bnd.offset = bnd_s->size; |
| 2485 | |
| 2486 | /* If this symbol is not defined in a regular file, and we are |
| 2487 | not generating a shared library, then set the symbol to this |
| 2488 | location in the .plt. This is required to make function |
| 2489 | pointers compare as equal between the normal executable and |
| 2490 | the shared library. */ |
| 2491 | if (! info->shared |
| 2492 | && !h->def_regular) |
| 2493 | { |
| 2494 | if (bnd_s) |
| 2495 | { |
| 2496 | /* We need to make a call to the entry of the second |
| 2497 | PLT instead of regular PLT entry. */ |
| 2498 | h->root.u.def.section = bnd_s; |
| 2499 | h->root.u.def.value = eh->plt_bnd.offset; |
| 2500 | } |
| 2501 | else |
| 2502 | { |
| 2503 | h->root.u.def.section = s; |
| 2504 | h->root.u.def.value = h->plt.offset; |
| 2505 | } |
| 2506 | } |
| 2507 | |
| 2508 | /* Make room for this entry. */ |
| 2509 | s->size += plt_entry_size; |
| 2510 | if (bnd_s) |
| 2511 | { |
| 2512 | BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry) |
| 2513 | == sizeof (elf_x86_64_legacy_plt2_entry)); |
| 2514 | bnd_s->size += sizeof (elf_x86_64_legacy_plt2_entry); |
| 2515 | } |
| 2516 | |
| 2517 | /* We also need to make an entry in the .got.plt section, which |
| 2518 | will be placed in the .got section by the linker script. */ |
| 2519 | htab->elf.sgotplt->size += GOT_ENTRY_SIZE; |
| 2520 | |
| 2521 | /* We also need to make an entry in the .rela.plt section. */ |
| 2522 | htab->elf.srelplt->size += bed->s->sizeof_rela; |
| 2523 | htab->elf.srelplt->reloc_count++; |
| 2524 | } |
| 2525 | else |
| 2526 | { |
| 2527 | h->plt.offset = (bfd_vma) -1; |
| 2528 | h->needs_plt = 0; |
| 2529 | } |
| 2530 | } |
| 2531 | else |
| 2532 | { |
| 2533 | h->plt.offset = (bfd_vma) -1; |
| 2534 | h->needs_plt = 0; |
| 2535 | } |
| 2536 | |
| 2537 | eh->tlsdesc_got = (bfd_vma) -1; |
| 2538 | |
| 2539 | /* If R_X86_64_GOTTPOFF symbol is now local to the binary, |
| 2540 | make it a R_X86_64_TPOFF32 requiring no GOT entry. */ |
| 2541 | if (h->got.refcount > 0 |
| 2542 | && info->executable |
| 2543 | && h->dynindx == -1 |
| 2544 | && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE) |
| 2545 | { |
| 2546 | h->got.offset = (bfd_vma) -1; |
| 2547 | } |
| 2548 | else if (h->got.refcount > 0) |
| 2549 | { |
| 2550 | asection *s; |
| 2551 | bfd_boolean dyn; |
| 2552 | int tls_type = elf_x86_64_hash_entry (h)->tls_type; |
| 2553 | |
| 2554 | /* Make sure this symbol is output as a dynamic symbol. |
| 2555 | Undefined weak syms won't yet be marked as dynamic. */ |
| 2556 | if (h->dynindx == -1 |
| 2557 | && !h->forced_local) |
| 2558 | { |
| 2559 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2560 | return FALSE; |
| 2561 | } |
| 2562 | |
| 2563 | if (GOT_TLS_GDESC_P (tls_type)) |
| 2564 | { |
| 2565 | eh->tlsdesc_got = htab->elf.sgotplt->size |
| 2566 | - elf_x86_64_compute_jump_table_size (htab); |
| 2567 | htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE; |
| 2568 | h->got.offset = (bfd_vma) -2; |
| 2569 | } |
| 2570 | if (! GOT_TLS_GDESC_P (tls_type) |
| 2571 | || GOT_TLS_GD_P (tls_type)) |
| 2572 | { |
| 2573 | s = htab->elf.sgot; |
| 2574 | h->got.offset = s->size; |
| 2575 | s->size += GOT_ENTRY_SIZE; |
| 2576 | if (GOT_TLS_GD_P (tls_type)) |
| 2577 | s->size += GOT_ENTRY_SIZE; |
| 2578 | } |
| 2579 | dyn = htab->elf.dynamic_sections_created; |
| 2580 | /* R_X86_64_TLSGD needs one dynamic relocation if local symbol |
| 2581 | and two if global. |
| 2582 | R_X86_64_GOTTPOFF needs one dynamic relocation. */ |
| 2583 | if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) |
| 2584 | || tls_type == GOT_TLS_IE) |
| 2585 | htab->elf.srelgot->size += bed->s->sizeof_rela; |
| 2586 | else if (GOT_TLS_GD_P (tls_type)) |
| 2587 | htab->elf.srelgot->size += 2 * bed->s->sizeof_rela; |
| 2588 | else if (! GOT_TLS_GDESC_P (tls_type) |
| 2589 | && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2590 | || h->root.type != bfd_link_hash_undefweak) |
| 2591 | && (info->shared |
| 2592 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) |
| 2593 | htab->elf.srelgot->size += bed->s->sizeof_rela; |
| 2594 | if (GOT_TLS_GDESC_P (tls_type)) |
| 2595 | { |
| 2596 | htab->elf.srelplt->size += bed->s->sizeof_rela; |
| 2597 | htab->tlsdesc_plt = (bfd_vma) -1; |
| 2598 | } |
| 2599 | } |
| 2600 | else |
| 2601 | h->got.offset = (bfd_vma) -1; |
| 2602 | |
| 2603 | if (eh->dyn_relocs == NULL) |
| 2604 | return TRUE; |
| 2605 | |
| 2606 | /* In the shared -Bsymbolic case, discard space allocated for |
| 2607 | dynamic pc-relative relocs against symbols which turn out to be |
| 2608 | defined in regular objects. For the normal shared case, discard |
| 2609 | space for pc-relative relocs that have become local due to symbol |
| 2610 | visibility changes. */ |
| 2611 | |
| 2612 | if (info->shared) |
| 2613 | { |
| 2614 | /* Relocs that use pc_count are those that appear on a call |
| 2615 | insn, or certain REL relocs that can generated via assembly. |
| 2616 | We want calls to protected symbols to resolve directly to the |
| 2617 | function rather than going via the plt. If people want |
| 2618 | function pointer comparisons to work as expected then they |
| 2619 | should avoid writing weird assembly. */ |
| 2620 | if (SYMBOL_CALLS_LOCAL (info, h)) |
| 2621 | { |
| 2622 | struct elf_dyn_relocs **pp; |
| 2623 | |
| 2624 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 2625 | { |
| 2626 | p->count -= p->pc_count; |
| 2627 | p->pc_count = 0; |
| 2628 | if (p->count == 0) |
| 2629 | *pp = p->next; |
| 2630 | else |
| 2631 | pp = &p->next; |
| 2632 | } |
| 2633 | } |
| 2634 | |
| 2635 | /* Also discard relocs on undefined weak syms with non-default |
| 2636 | visibility. */ |
| 2637 | if (eh->dyn_relocs != NULL |
| 2638 | && h->root.type == bfd_link_hash_undefweak) |
| 2639 | { |
| 2640 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 2641 | eh->dyn_relocs = NULL; |
| 2642 | |
| 2643 | /* Make sure undefined weak symbols are output as a dynamic |
| 2644 | symbol in PIEs. */ |
| 2645 | else if (h->dynindx == -1 |
| 2646 | && ! h->forced_local |
| 2647 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2648 | return FALSE; |
| 2649 | } |
| 2650 | |
| 2651 | } |
| 2652 | else if (ELIMINATE_COPY_RELOCS) |
| 2653 | { |
| 2654 | /* For the non-shared case, discard space for relocs against |
| 2655 | symbols which turn out to need copy relocs or are not |
| 2656 | dynamic. */ |
| 2657 | |
| 2658 | if (!h->non_got_ref |
| 2659 | && ((h->def_dynamic |
| 2660 | && !h->def_regular) |
| 2661 | || (htab->elf.dynamic_sections_created |
| 2662 | && (h->root.type == bfd_link_hash_undefweak |
| 2663 | || h->root.type == bfd_link_hash_undefined)))) |
| 2664 | { |
| 2665 | /* Make sure this symbol is output as a dynamic symbol. |
| 2666 | Undefined weak syms won't yet be marked as dynamic. */ |
| 2667 | if (h->dynindx == -1 |
| 2668 | && ! h->forced_local |
| 2669 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2670 | return FALSE; |
| 2671 | |
| 2672 | /* If that succeeded, we know we'll be keeping all the |
| 2673 | relocs. */ |
| 2674 | if (h->dynindx != -1) |
| 2675 | goto keep; |
| 2676 | } |
| 2677 | |
| 2678 | eh->dyn_relocs = NULL; |
| 2679 | |
| 2680 | keep: ; |
| 2681 | } |
| 2682 | |
| 2683 | /* Finally, allocate space. */ |
| 2684 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 2685 | { |
| 2686 | asection * sreloc; |
| 2687 | |
| 2688 | sreloc = elf_section_data (p->sec)->sreloc; |
| 2689 | |
| 2690 | BFD_ASSERT (sreloc != NULL); |
| 2691 | |
| 2692 | sreloc->size += p->count * bed->s->sizeof_rela; |
| 2693 | } |
| 2694 | |
| 2695 | return TRUE; |
| 2696 | } |
| 2697 | |
| 2698 | /* Allocate space in .plt, .got and associated reloc sections for |
| 2699 | local dynamic relocs. */ |
| 2700 | |
| 2701 | static bfd_boolean |
| 2702 | elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf) |
| 2703 | { |
| 2704 | struct elf_link_hash_entry *h |
| 2705 | = (struct elf_link_hash_entry *) *slot; |
| 2706 | |
| 2707 | if (h->type != STT_GNU_IFUNC |
| 2708 | || !h->def_regular |
| 2709 | || !h->ref_regular |
| 2710 | || !h->forced_local |
| 2711 | || h->root.type != bfd_link_hash_defined) |
| 2712 | abort (); |
| 2713 | |
| 2714 | return elf_x86_64_allocate_dynrelocs (h, inf); |
| 2715 | } |
| 2716 | |
| 2717 | /* Find any dynamic relocs that apply to read-only sections. */ |
| 2718 | |
| 2719 | static bfd_boolean |
| 2720 | elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h, |
| 2721 | void * inf) |
| 2722 | { |
| 2723 | struct elf_x86_64_link_hash_entry *eh; |
| 2724 | struct elf_dyn_relocs *p; |
| 2725 | |
| 2726 | /* Skip local IFUNC symbols. */ |
| 2727 | if (h->forced_local && h->type == STT_GNU_IFUNC) |
| 2728 | return TRUE; |
| 2729 | |
| 2730 | eh = (struct elf_x86_64_link_hash_entry *) h; |
| 2731 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 2732 | { |
| 2733 | asection *s = p->sec->output_section; |
| 2734 | |
| 2735 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 2736 | { |
| 2737 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 2738 | |
| 2739 | info->flags |= DF_TEXTREL; |
| 2740 | |
| 2741 | if (info->warn_shared_textrel && info->shared) |
| 2742 | info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"), |
| 2743 | p->sec->owner, h->root.root.string, |
| 2744 | p->sec); |
| 2745 | |
| 2746 | /* Not an error, just cut short the traversal. */ |
| 2747 | return FALSE; |
| 2748 | } |
| 2749 | } |
| 2750 | return TRUE; |
| 2751 | } |
| 2752 | |
| 2753 | /* Convert |
| 2754 | mov foo@GOTPCREL(%rip), %reg |
| 2755 | to |
| 2756 | lea foo(%rip), %reg |
| 2757 | with the local symbol, foo. */ |
| 2758 | |
| 2759 | static bfd_boolean |
| 2760 | elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec, |
| 2761 | struct bfd_link_info *link_info) |
| 2762 | { |
| 2763 | Elf_Internal_Shdr *symtab_hdr; |
| 2764 | Elf_Internal_Rela *internal_relocs; |
| 2765 | Elf_Internal_Rela *irel, *irelend; |
| 2766 | bfd_byte *contents; |
| 2767 | struct elf_x86_64_link_hash_table *htab; |
| 2768 | bfd_boolean changed_contents; |
| 2769 | bfd_boolean changed_relocs; |
| 2770 | bfd_signed_vma *local_got_refcounts; |
| 2771 | |
| 2772 | /* Don't even try to convert non-ELF outputs. */ |
| 2773 | if (!is_elf_hash_table (link_info->hash)) |
| 2774 | return FALSE; |
| 2775 | |
| 2776 | /* Nothing to do if there are no codes, no relocations or no output. */ |
| 2777 | if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC) |
| 2778 | || sec->reloc_count == 0 |
| 2779 | || discarded_section (sec)) |
| 2780 | return TRUE; |
| 2781 | |
| 2782 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 2783 | |
| 2784 | /* Load the relocations for this section. */ |
| 2785 | internal_relocs = (_bfd_elf_link_read_relocs |
| 2786 | (abfd, sec, NULL, (Elf_Internal_Rela *) NULL, |
| 2787 | link_info->keep_memory)); |
| 2788 | if (internal_relocs == NULL) |
| 2789 | return FALSE; |
| 2790 | |
| 2791 | htab = elf_x86_64_hash_table (link_info); |
| 2792 | changed_contents = FALSE; |
| 2793 | changed_relocs = FALSE; |
| 2794 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 2795 | |
| 2796 | /* Get the section contents. */ |
| 2797 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 2798 | contents = elf_section_data (sec)->this_hdr.contents; |
| 2799 | else |
| 2800 | { |
| 2801 | if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 2802 | goto error_return; |
| 2803 | } |
| 2804 | |
| 2805 | irelend = internal_relocs + sec->reloc_count; |
| 2806 | for (irel = internal_relocs; irel < irelend; irel++) |
| 2807 | { |
| 2808 | unsigned int r_type = ELF32_R_TYPE (irel->r_info); |
| 2809 | unsigned int r_symndx = htab->r_sym (irel->r_info); |
| 2810 | unsigned int indx; |
| 2811 | struct elf_link_hash_entry *h; |
| 2812 | |
| 2813 | if (r_type != R_X86_64_GOTPCREL) |
| 2814 | continue; |
| 2815 | |
| 2816 | /* Get the symbol referred to by the reloc. */ |
| 2817 | if (r_symndx < symtab_hdr->sh_info) |
| 2818 | { |
| 2819 | Elf_Internal_Sym *isym; |
| 2820 | |
| 2821 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 2822 | abfd, r_symndx); |
| 2823 | |
| 2824 | /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */ |
| 2825 | if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC |
| 2826 | && bfd_get_8 (input_bfd, |
| 2827 | contents + irel->r_offset - 2) == 0x8b) |
| 2828 | { |
| 2829 | bfd_put_8 (output_bfd, 0x8d, |
| 2830 | contents + irel->r_offset - 2); |
| 2831 | irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32); |
| 2832 | if (local_got_refcounts != NULL |
| 2833 | && local_got_refcounts[r_symndx] > 0) |
| 2834 | local_got_refcounts[r_symndx] -= 1; |
| 2835 | changed_contents = TRUE; |
| 2836 | changed_relocs = TRUE; |
| 2837 | } |
| 2838 | continue; |
| 2839 | } |
| 2840 | |
| 2841 | indx = r_symndx - symtab_hdr->sh_info; |
| 2842 | h = elf_sym_hashes (abfd)[indx]; |
| 2843 | BFD_ASSERT (h != NULL); |
| 2844 | |
| 2845 | while (h->root.type == bfd_link_hash_indirect |
| 2846 | || h->root.type == bfd_link_hash_warning) |
| 2847 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2848 | |
| 2849 | /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also |
| 2850 | avoid optimizing _DYNAMIC since ld.so may use its link-time |
| 2851 | address. */ |
| 2852 | if (h->def_regular |
| 2853 | && h->type != STT_GNU_IFUNC |
| 2854 | && h != htab->elf.hdynamic |
| 2855 | && SYMBOL_REFERENCES_LOCAL (link_info, h) |
| 2856 | && bfd_get_8 (input_bfd, |
| 2857 | contents + irel->r_offset - 2) == 0x8b) |
| 2858 | { |
| 2859 | bfd_put_8 (output_bfd, 0x8d, |
| 2860 | contents + irel->r_offset - 2); |
| 2861 | irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32); |
| 2862 | if (h->got.refcount > 0) |
| 2863 | h->got.refcount -= 1; |
| 2864 | changed_contents = TRUE; |
| 2865 | changed_relocs = TRUE; |
| 2866 | } |
| 2867 | } |
| 2868 | |
| 2869 | if (contents != NULL |
| 2870 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 2871 | { |
| 2872 | if (!changed_contents && !link_info->keep_memory) |
| 2873 | free (contents); |
| 2874 | else |
| 2875 | { |
| 2876 | /* Cache the section contents for elf_link_input_bfd. */ |
| 2877 | elf_section_data (sec)->this_hdr.contents = contents; |
| 2878 | } |
| 2879 | } |
| 2880 | |
| 2881 | if (elf_section_data (sec)->relocs != internal_relocs) |
| 2882 | { |
| 2883 | if (!changed_relocs) |
| 2884 | free (internal_relocs); |
| 2885 | else |
| 2886 | elf_section_data (sec)->relocs = internal_relocs; |
| 2887 | } |
| 2888 | |
| 2889 | return TRUE; |
| 2890 | |
| 2891 | error_return: |
| 2892 | if (contents != NULL |
| 2893 | && elf_section_data (sec)->this_hdr.contents != contents) |
| 2894 | free (contents); |
| 2895 | if (internal_relocs != NULL |
| 2896 | && elf_section_data (sec)->relocs != internal_relocs) |
| 2897 | free (internal_relocs); |
| 2898 | return FALSE; |
| 2899 | } |
| 2900 | |
| 2901 | /* Set the sizes of the dynamic sections. */ |
| 2902 | |
| 2903 | static bfd_boolean |
| 2904 | elf_x86_64_size_dynamic_sections (bfd *output_bfd, |
| 2905 | struct bfd_link_info *info) |
| 2906 | { |
| 2907 | struct elf_x86_64_link_hash_table *htab; |
| 2908 | bfd *dynobj; |
| 2909 | asection *s; |
| 2910 | bfd_boolean relocs; |
| 2911 | bfd *ibfd; |
| 2912 | const struct elf_backend_data *bed; |
| 2913 | |
| 2914 | htab = elf_x86_64_hash_table (info); |
| 2915 | if (htab == NULL) |
| 2916 | return FALSE; |
| 2917 | bed = get_elf_backend_data (output_bfd); |
| 2918 | |
| 2919 | dynobj = htab->elf.dynobj; |
| 2920 | if (dynobj == NULL) |
| 2921 | abort (); |
| 2922 | |
| 2923 | if (htab->elf.dynamic_sections_created) |
| 2924 | { |
| 2925 | /* Set the contents of the .interp section to the interpreter. */ |
| 2926 | if (info->executable) |
| 2927 | { |
| 2928 | s = bfd_get_linker_section (dynobj, ".interp"); |
| 2929 | if (s == NULL) |
| 2930 | abort (); |
| 2931 | s->size = htab->dynamic_interpreter_size; |
| 2932 | s->contents = (unsigned char *) htab->dynamic_interpreter; |
| 2933 | } |
| 2934 | } |
| 2935 | |
| 2936 | /* Set up .got offsets for local syms, and space for local dynamic |
| 2937 | relocs. */ |
| 2938 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 2939 | { |
| 2940 | bfd_signed_vma *local_got; |
| 2941 | bfd_signed_vma *end_local_got; |
| 2942 | char *local_tls_type; |
| 2943 | bfd_vma *local_tlsdesc_gotent; |
| 2944 | bfd_size_type locsymcount; |
| 2945 | Elf_Internal_Shdr *symtab_hdr; |
| 2946 | asection *srel; |
| 2947 | |
| 2948 | if (! is_x86_64_elf (ibfd)) |
| 2949 | continue; |
| 2950 | |
| 2951 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 2952 | { |
| 2953 | struct elf_dyn_relocs *p; |
| 2954 | |
| 2955 | if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info)) |
| 2956 | return FALSE; |
| 2957 | |
| 2958 | for (p = (struct elf_dyn_relocs *) |
| 2959 | (elf_section_data (s)->local_dynrel); |
| 2960 | p != NULL; |
| 2961 | p = p->next) |
| 2962 | { |
| 2963 | if (!bfd_is_abs_section (p->sec) |
| 2964 | && bfd_is_abs_section (p->sec->output_section)) |
| 2965 | { |
| 2966 | /* Input section has been discarded, either because |
| 2967 | it is a copy of a linkonce section or due to |
| 2968 | linker script /DISCARD/, so we'll be discarding |
| 2969 | the relocs too. */ |
| 2970 | } |
| 2971 | else if (p->count != 0) |
| 2972 | { |
| 2973 | srel = elf_section_data (p->sec)->sreloc; |
| 2974 | srel->size += p->count * bed->s->sizeof_rela; |
| 2975 | if ((p->sec->output_section->flags & SEC_READONLY) != 0 |
| 2976 | && (info->flags & DF_TEXTREL) == 0) |
| 2977 | { |
| 2978 | info->flags |= DF_TEXTREL; |
| 2979 | if (info->warn_shared_textrel && info->shared) |
| 2980 | info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"), |
| 2981 | p->sec->owner, p->sec); |
| 2982 | } |
| 2983 | } |
| 2984 | } |
| 2985 | } |
| 2986 | |
| 2987 | local_got = elf_local_got_refcounts (ibfd); |
| 2988 | if (!local_got) |
| 2989 | continue; |
| 2990 | |
| 2991 | symtab_hdr = &elf_symtab_hdr (ibfd); |
| 2992 | locsymcount = symtab_hdr->sh_info; |
| 2993 | end_local_got = local_got + locsymcount; |
| 2994 | local_tls_type = elf_x86_64_local_got_tls_type (ibfd); |
| 2995 | local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd); |
| 2996 | s = htab->elf.sgot; |
| 2997 | srel = htab->elf.srelgot; |
| 2998 | for (; local_got < end_local_got; |
| 2999 | ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) |
| 3000 | { |
| 3001 | *local_tlsdesc_gotent = (bfd_vma) -1; |
| 3002 | if (*local_got > 0) |
| 3003 | { |
| 3004 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 3005 | { |
| 3006 | *local_tlsdesc_gotent = htab->elf.sgotplt->size |
| 3007 | - elf_x86_64_compute_jump_table_size (htab); |
| 3008 | htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE; |
| 3009 | *local_got = (bfd_vma) -2; |
| 3010 | } |
| 3011 | if (! GOT_TLS_GDESC_P (*local_tls_type) |
| 3012 | || GOT_TLS_GD_P (*local_tls_type)) |
| 3013 | { |
| 3014 | *local_got = s->size; |
| 3015 | s->size += GOT_ENTRY_SIZE; |
| 3016 | if (GOT_TLS_GD_P (*local_tls_type)) |
| 3017 | s->size += GOT_ENTRY_SIZE; |
| 3018 | } |
| 3019 | if (info->shared |
| 3020 | || GOT_TLS_GD_ANY_P (*local_tls_type) |
| 3021 | || *local_tls_type == GOT_TLS_IE) |
| 3022 | { |
| 3023 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 3024 | { |
| 3025 | htab->elf.srelplt->size |
| 3026 | += bed->s->sizeof_rela; |
| 3027 | htab->tlsdesc_plt = (bfd_vma) -1; |
| 3028 | } |
| 3029 | if (! GOT_TLS_GDESC_P (*local_tls_type) |
| 3030 | || GOT_TLS_GD_P (*local_tls_type)) |
| 3031 | srel->size += bed->s->sizeof_rela; |
| 3032 | } |
| 3033 | } |
| 3034 | else |
| 3035 | *local_got = (bfd_vma) -1; |
| 3036 | } |
| 3037 | } |
| 3038 | |
| 3039 | if (htab->tls_ld_got.refcount > 0) |
| 3040 | { |
| 3041 | /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD |
| 3042 | relocs. */ |
| 3043 | htab->tls_ld_got.offset = htab->elf.sgot->size; |
| 3044 | htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE; |
| 3045 | htab->elf.srelgot->size += bed->s->sizeof_rela; |
| 3046 | } |
| 3047 | else |
| 3048 | htab->tls_ld_got.offset = -1; |
| 3049 | |
| 3050 | /* Allocate global sym .plt and .got entries, and space for global |
| 3051 | sym dynamic relocs. */ |
| 3052 | elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs, |
| 3053 | info); |
| 3054 | |
| 3055 | /* Allocate .plt and .got entries, and space for local symbols. */ |
| 3056 | htab_traverse (htab->loc_hash_table, |
| 3057 | elf_x86_64_allocate_local_dynrelocs, |
| 3058 | info); |
| 3059 | |
| 3060 | /* For every jump slot reserved in the sgotplt, reloc_count is |
| 3061 | incremented. However, when we reserve space for TLS descriptors, |
| 3062 | it's not incremented, so in order to compute the space reserved |
| 3063 | for them, it suffices to multiply the reloc count by the jump |
| 3064 | slot size. |
| 3065 | |
| 3066 | PR ld/13302: We start next_irelative_index at the end of .rela.plt |
| 3067 | so that R_X86_64_IRELATIVE entries come last. */ |
| 3068 | if (htab->elf.srelplt) |
| 3069 | { |
| 3070 | htab->sgotplt_jump_table_size |
| 3071 | = elf_x86_64_compute_jump_table_size (htab); |
| 3072 | htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1; |
| 3073 | } |
| 3074 | else if (htab->elf.irelplt) |
| 3075 | htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1; |
| 3076 | |
| 3077 | if (htab->tlsdesc_plt) |
| 3078 | { |
| 3079 | /* If we're not using lazy TLS relocations, don't generate the |
| 3080 | PLT and GOT entries they require. */ |
| 3081 | if ((info->flags & DF_BIND_NOW)) |
| 3082 | htab->tlsdesc_plt = 0; |
| 3083 | else |
| 3084 | { |
| 3085 | htab->tlsdesc_got = htab->elf.sgot->size; |
| 3086 | htab->elf.sgot->size += GOT_ENTRY_SIZE; |
| 3087 | /* Reserve room for the initial entry. |
| 3088 | FIXME: we could probably do away with it in this case. */ |
| 3089 | if (htab->elf.splt->size == 0) |
| 3090 | htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd); |
| 3091 | htab->tlsdesc_plt = htab->elf.splt->size; |
| 3092 | htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd); |
| 3093 | } |
| 3094 | } |
| 3095 | |
| 3096 | if (htab->elf.sgotplt) |
| 3097 | { |
| 3098 | /* Don't allocate .got.plt section if there are no GOT nor PLT |
| 3099 | entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */ |
| 3100 | if ((htab->elf.hgot == NULL |
| 3101 | || !htab->elf.hgot->ref_regular_nonweak) |
| 3102 | && (htab->elf.sgotplt->size |
| 3103 | == get_elf_backend_data (output_bfd)->got_header_size) |
| 3104 | && (htab->elf.splt == NULL |
| 3105 | || htab->elf.splt->size == 0) |
| 3106 | && (htab->elf.sgot == NULL |
| 3107 | || htab->elf.sgot->size == 0) |
| 3108 | && (htab->elf.iplt == NULL |
| 3109 | || htab->elf.iplt->size == 0) |
| 3110 | && (htab->elf.igotplt == NULL |
| 3111 | || htab->elf.igotplt->size == 0)) |
| 3112 | htab->elf.sgotplt->size = 0; |
| 3113 | } |
| 3114 | |
| 3115 | if (htab->plt_eh_frame != NULL |
| 3116 | && htab->elf.splt != NULL |
| 3117 | && htab->elf.splt->size != 0 |
| 3118 | && !bfd_is_abs_section (htab->elf.splt->output_section) |
| 3119 | && _bfd_elf_eh_frame_present (info)) |
| 3120 | { |
| 3121 | const struct elf_x86_64_backend_data *arch_data |
| 3122 | = get_elf_x86_64_arch_data (bed); |
| 3123 | htab->plt_eh_frame->size = arch_data->eh_frame_plt_size; |
| 3124 | } |
| 3125 | |
| 3126 | /* We now have determined the sizes of the various dynamic sections. |
| 3127 | Allocate memory for them. */ |
| 3128 | relocs = FALSE; |
| 3129 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 3130 | { |
| 3131 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 3132 | continue; |
| 3133 | |
| 3134 | if (s == htab->elf.splt |
| 3135 | || s == htab->elf.sgot |
| 3136 | || s == htab->elf.sgotplt |
| 3137 | || s == htab->elf.iplt |
| 3138 | || s == htab->elf.igotplt |
| 3139 | || s == htab->plt_bnd |
| 3140 | || s == htab->plt_eh_frame |
| 3141 | || s == htab->sdynbss) |
| 3142 | { |
| 3143 | /* Strip this section if we don't need it; see the |
| 3144 | comment below. */ |
| 3145 | } |
| 3146 | else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) |
| 3147 | { |
| 3148 | if (s->size != 0 && s != htab->elf.srelplt) |
| 3149 | relocs = TRUE; |
| 3150 | |
| 3151 | /* We use the reloc_count field as a counter if we need |
| 3152 | to copy relocs into the output file. */ |
| 3153 | if (s != htab->elf.srelplt) |
| 3154 | s->reloc_count = 0; |
| 3155 | } |
| 3156 | else |
| 3157 | { |
| 3158 | /* It's not one of our sections, so don't allocate space. */ |
| 3159 | continue; |
| 3160 | } |
| 3161 | |
| 3162 | if (s->size == 0) |
| 3163 | { |
| 3164 | /* If we don't need this section, strip it from the |
| 3165 | output file. This is mostly to handle .rela.bss and |
| 3166 | .rela.plt. We must create both sections in |
| 3167 | create_dynamic_sections, because they must be created |
| 3168 | before the linker maps input sections to output |
| 3169 | sections. The linker does that before |
| 3170 | adjust_dynamic_symbol is called, and it is that |
| 3171 | function which decides whether anything needs to go |
| 3172 | into these sections. */ |
| 3173 | |
| 3174 | s->flags |= SEC_EXCLUDE; |
| 3175 | continue; |
| 3176 | } |
| 3177 | |
| 3178 | if ((s->flags & SEC_HAS_CONTENTS) == 0) |
| 3179 | continue; |
| 3180 | |
| 3181 | /* Allocate memory for the section contents. We use bfd_zalloc |
| 3182 | here in case unused entries are not reclaimed before the |
| 3183 | section's contents are written out. This should not happen, |
| 3184 | but this way if it does, we get a R_X86_64_NONE reloc instead |
| 3185 | of garbage. */ |
| 3186 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); |
| 3187 | if (s->contents == NULL) |
| 3188 | return FALSE; |
| 3189 | } |
| 3190 | |
| 3191 | if (htab->plt_eh_frame != NULL |
| 3192 | && htab->plt_eh_frame->contents != NULL) |
| 3193 | { |
| 3194 | const struct elf_x86_64_backend_data *arch_data |
| 3195 | = get_elf_x86_64_arch_data (bed); |
| 3196 | |
| 3197 | memcpy (htab->plt_eh_frame->contents, |
| 3198 | arch_data->eh_frame_plt, htab->plt_eh_frame->size); |
| 3199 | bfd_put_32 (dynobj, htab->elf.splt->size, |
| 3200 | htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET); |
| 3201 | } |
| 3202 | |
| 3203 | if (htab->elf.dynamic_sections_created) |
| 3204 | { |
| 3205 | /* Add some entries to the .dynamic section. We fill in the |
| 3206 | values later, in elf_x86_64_finish_dynamic_sections, but we |
| 3207 | must add the entries now so that we get the correct size for |
| 3208 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 3209 | dynamic linker and used by the debugger. */ |
| 3210 | #define add_dynamic_entry(TAG, VAL) \ |
| 3211 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| 3212 | |
| 3213 | if (info->executable) |
| 3214 | { |
| 3215 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 3216 | return FALSE; |
| 3217 | } |
| 3218 | |
| 3219 | if (htab->elf.splt->size != 0) |
| 3220 | { |
| 3221 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 3222 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 3223 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) |
| 3224 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 3225 | return FALSE; |
| 3226 | |
| 3227 | if (htab->tlsdesc_plt |
| 3228 | && (!add_dynamic_entry (DT_TLSDESC_PLT, 0) |
| 3229 | || !add_dynamic_entry (DT_TLSDESC_GOT, 0))) |
| 3230 | return FALSE; |
| 3231 | } |
| 3232 | |
| 3233 | if (relocs) |
| 3234 | { |
| 3235 | if (!add_dynamic_entry (DT_RELA, 0) |
| 3236 | || !add_dynamic_entry (DT_RELASZ, 0) |
| 3237 | || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela)) |
| 3238 | return FALSE; |
| 3239 | |
| 3240 | /* If any dynamic relocs apply to a read-only section, |
| 3241 | then we need a DT_TEXTREL entry. */ |
| 3242 | if ((info->flags & DF_TEXTREL) == 0) |
| 3243 | elf_link_hash_traverse (&htab->elf, |
| 3244 | elf_x86_64_readonly_dynrelocs, |
| 3245 | info); |
| 3246 | |
| 3247 | if ((info->flags & DF_TEXTREL) != 0) |
| 3248 | { |
| 3249 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 3250 | return FALSE; |
| 3251 | } |
| 3252 | } |
| 3253 | } |
| 3254 | #undef add_dynamic_entry |
| 3255 | |
| 3256 | return TRUE; |
| 3257 | } |
| 3258 | |
| 3259 | static bfd_boolean |
| 3260 | elf_x86_64_always_size_sections (bfd *output_bfd, |
| 3261 | struct bfd_link_info *info) |
| 3262 | { |
| 3263 | asection *tls_sec = elf_hash_table (info)->tls_sec; |
| 3264 | |
| 3265 | if (tls_sec) |
| 3266 | { |
| 3267 | struct elf_link_hash_entry *tlsbase; |
| 3268 | |
| 3269 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), |
| 3270 | "_TLS_MODULE_BASE_", |
| 3271 | FALSE, FALSE, FALSE); |
| 3272 | |
| 3273 | if (tlsbase && tlsbase->type == STT_TLS) |
| 3274 | { |
| 3275 | struct elf_x86_64_link_hash_table *htab; |
| 3276 | struct bfd_link_hash_entry *bh = NULL; |
| 3277 | const struct elf_backend_data *bed |
| 3278 | = get_elf_backend_data (output_bfd); |
| 3279 | |
| 3280 | htab = elf_x86_64_hash_table (info); |
| 3281 | if (htab == NULL) |
| 3282 | return FALSE; |
| 3283 | |
| 3284 | if (!(_bfd_generic_link_add_one_symbol |
| 3285 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, |
| 3286 | tls_sec, 0, NULL, FALSE, |
| 3287 | bed->collect, &bh))) |
| 3288 | return FALSE; |
| 3289 | |
| 3290 | htab->tls_module_base = bh; |
| 3291 | |
| 3292 | tlsbase = (struct elf_link_hash_entry *)bh; |
| 3293 | tlsbase->def_regular = 1; |
| 3294 | tlsbase->other = STV_HIDDEN; |
| 3295 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); |
| 3296 | } |
| 3297 | } |
| 3298 | |
| 3299 | return TRUE; |
| 3300 | } |
| 3301 | |
| 3302 | /* _TLS_MODULE_BASE_ needs to be treated especially when linking |
| 3303 | executables. Rather than setting it to the beginning of the TLS |
| 3304 | section, we have to set it to the end. This function may be called |
| 3305 | multiple times, it is idempotent. */ |
| 3306 | |
| 3307 | static void |
| 3308 | elf_x86_64_set_tls_module_base (struct bfd_link_info *info) |
| 3309 | { |
| 3310 | struct elf_x86_64_link_hash_table *htab; |
| 3311 | struct bfd_link_hash_entry *base; |
| 3312 | |
| 3313 | if (!info->executable) |
| 3314 | return; |
| 3315 | |
| 3316 | htab = elf_x86_64_hash_table (info); |
| 3317 | if (htab == NULL) |
| 3318 | return; |
| 3319 | |
| 3320 | base = htab->tls_module_base; |
| 3321 | if (base == NULL) |
| 3322 | return; |
| 3323 | |
| 3324 | base->u.def.value = htab->elf.tls_size; |
| 3325 | } |
| 3326 | |
| 3327 | /* Return the base VMA address which should be subtracted from real addresses |
| 3328 | when resolving @dtpoff relocation. |
| 3329 | This is PT_TLS segment p_vaddr. */ |
| 3330 | |
| 3331 | static bfd_vma |
| 3332 | elf_x86_64_dtpoff_base (struct bfd_link_info *info) |
| 3333 | { |
| 3334 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 3335 | if (elf_hash_table (info)->tls_sec == NULL) |
| 3336 | return 0; |
| 3337 | return elf_hash_table (info)->tls_sec->vma; |
| 3338 | } |
| 3339 | |
| 3340 | /* Return the relocation value for @tpoff relocation |
| 3341 | if STT_TLS virtual address is ADDRESS. */ |
| 3342 | |
| 3343 | static bfd_vma |
| 3344 | elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address) |
| 3345 | { |
| 3346 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 3347 | const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); |
| 3348 | bfd_vma static_tls_size; |
| 3349 | |
| 3350 | /* If tls_segment is NULL, we should have signalled an error already. */ |
| 3351 | if (htab->tls_sec == NULL) |
| 3352 | return 0; |
| 3353 | |
| 3354 | /* Consider special static TLS alignment requirements. */ |
| 3355 | static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); |
| 3356 | return address - static_tls_size - htab->tls_sec->vma; |
| 3357 | } |
| 3358 | |
| 3359 | /* Is the instruction before OFFSET in CONTENTS a 32bit relative |
| 3360 | branch? */ |
| 3361 | |
| 3362 | static bfd_boolean |
| 3363 | is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset) |
| 3364 | { |
| 3365 | /* Opcode Instruction |
| 3366 | 0xe8 call |
| 3367 | 0xe9 jump |
| 3368 | 0x0f 0x8x conditional jump */ |
| 3369 | return ((offset > 0 |
| 3370 | && (contents [offset - 1] == 0xe8 |
| 3371 | || contents [offset - 1] == 0xe9)) |
| 3372 | || (offset > 1 |
| 3373 | && contents [offset - 2] == 0x0f |
| 3374 | && (contents [offset - 1] & 0xf0) == 0x80)); |
| 3375 | } |
| 3376 | |
| 3377 | /* Relocate an x86_64 ELF section. */ |
| 3378 | |
| 3379 | static bfd_boolean |
| 3380 | elf_x86_64_relocate_section (bfd *output_bfd, |
| 3381 | struct bfd_link_info *info, |
| 3382 | bfd *input_bfd, |
| 3383 | asection *input_section, |
| 3384 | bfd_byte *contents, |
| 3385 | Elf_Internal_Rela *relocs, |
| 3386 | Elf_Internal_Sym *local_syms, |
| 3387 | asection **local_sections) |
| 3388 | { |
| 3389 | struct elf_x86_64_link_hash_table *htab; |
| 3390 | Elf_Internal_Shdr *symtab_hdr; |
| 3391 | struct elf_link_hash_entry **sym_hashes; |
| 3392 | bfd_vma *local_got_offsets; |
| 3393 | bfd_vma *local_tlsdesc_gotents; |
| 3394 | Elf_Internal_Rela *rel; |
| 3395 | Elf_Internal_Rela *relend; |
| 3396 | const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd); |
| 3397 | |
| 3398 | BFD_ASSERT (is_x86_64_elf (input_bfd)); |
| 3399 | |
| 3400 | htab = elf_x86_64_hash_table (info); |
| 3401 | if (htab == NULL) |
| 3402 | return FALSE; |
| 3403 | symtab_hdr = &elf_symtab_hdr (input_bfd); |
| 3404 | sym_hashes = elf_sym_hashes (input_bfd); |
| 3405 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 3406 | local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd); |
| 3407 | |
| 3408 | elf_x86_64_set_tls_module_base (info); |
| 3409 | |
| 3410 | rel = relocs; |
| 3411 | relend = relocs + input_section->reloc_count; |
| 3412 | for (; rel < relend; rel++) |
| 3413 | { |
| 3414 | unsigned int r_type; |
| 3415 | reloc_howto_type *howto; |
| 3416 | unsigned long r_symndx; |
| 3417 | struct elf_link_hash_entry *h; |
| 3418 | struct elf_x86_64_link_hash_entry *eh; |
| 3419 | Elf_Internal_Sym *sym; |
| 3420 | asection *sec; |
| 3421 | bfd_vma off, offplt, plt_offset; |
| 3422 | bfd_vma relocation; |
| 3423 | bfd_boolean unresolved_reloc; |
| 3424 | bfd_reloc_status_type r; |
| 3425 | int tls_type; |
| 3426 | asection *base_got, *resolved_plt; |
| 3427 | bfd_vma st_size; |
| 3428 | |
| 3429 | r_type = ELF32_R_TYPE (rel->r_info); |
| 3430 | if (r_type == (int) R_X86_64_GNU_VTINHERIT |
| 3431 | || r_type == (int) R_X86_64_GNU_VTENTRY) |
| 3432 | continue; |
| 3433 | |
| 3434 | if (r_type >= (int) R_X86_64_standard) |
| 3435 | { |
| 3436 | (*_bfd_error_handler) |
| 3437 | (_("%B: unrecognized relocation (0x%x) in section `%A'"), |
| 3438 | input_bfd, input_section, r_type); |
| 3439 | bfd_set_error (bfd_error_bad_value); |
| 3440 | return FALSE; |
| 3441 | } |
| 3442 | |
| 3443 | if (r_type != (int) R_X86_64_32 |
| 3444 | || ABI_64_P (output_bfd)) |
| 3445 | howto = x86_64_elf_howto_table + r_type; |
| 3446 | else |
| 3447 | howto = (x86_64_elf_howto_table |
| 3448 | + ARRAY_SIZE (x86_64_elf_howto_table) - 1); |
| 3449 | r_symndx = htab->r_sym (rel->r_info); |
| 3450 | h = NULL; |
| 3451 | sym = NULL; |
| 3452 | sec = NULL; |
| 3453 | unresolved_reloc = FALSE; |
| 3454 | if (r_symndx < symtab_hdr->sh_info) |
| 3455 | { |
| 3456 | sym = local_syms + r_symndx; |
| 3457 | sec = local_sections[r_symndx]; |
| 3458 | |
| 3459 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, |
| 3460 | &sec, rel); |
| 3461 | st_size = sym->st_size; |
| 3462 | |
| 3463 | /* Relocate against local STT_GNU_IFUNC symbol. */ |
| 3464 | if (!info->relocatable |
| 3465 | && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) |
| 3466 | { |
| 3467 | h = elf_x86_64_get_local_sym_hash (htab, input_bfd, |
| 3468 | rel, FALSE); |
| 3469 | if (h == NULL) |
| 3470 | abort (); |
| 3471 | |
| 3472 | /* Set STT_GNU_IFUNC symbol value. */ |
| 3473 | h->root.u.def.value = sym->st_value; |
| 3474 | h->root.u.def.section = sec; |
| 3475 | } |
| 3476 | } |
| 3477 | else |
| 3478 | { |
| 3479 | bfd_boolean warned ATTRIBUTE_UNUSED; |
| 3480 | bfd_boolean ignored ATTRIBUTE_UNUSED; |
| 3481 | |
| 3482 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 3483 | r_symndx, symtab_hdr, sym_hashes, |
| 3484 | h, sec, relocation, |
| 3485 | unresolved_reloc, warned, ignored); |
| 3486 | st_size = h->size; |
| 3487 | } |
| 3488 | |
| 3489 | if (sec != NULL && discarded_section (sec)) |
| 3490 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 3491 | rel, 1, relend, howto, 0, contents); |
| 3492 | |
| 3493 | if (info->relocatable) |
| 3494 | continue; |
| 3495 | |
| 3496 | if (rel->r_addend == 0 && !ABI_64_P (output_bfd)) |
| 3497 | { |
| 3498 | if (r_type == R_X86_64_64) |
| 3499 | { |
| 3500 | /* For x32, treat R_X86_64_64 like R_X86_64_32 and |
| 3501 | zero-extend it to 64bit if addend is zero. */ |
| 3502 | r_type = R_X86_64_32; |
| 3503 | memset (contents + rel->r_offset + 4, 0, 4); |
| 3504 | } |
| 3505 | else if (r_type == R_X86_64_SIZE64) |
| 3506 | { |
| 3507 | /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and |
| 3508 | zero-extend it to 64bit if addend is zero. */ |
| 3509 | r_type = R_X86_64_SIZE32; |
| 3510 | memset (contents + rel->r_offset + 4, 0, 4); |
| 3511 | } |
| 3512 | } |
| 3513 | |
| 3514 | eh = (struct elf_x86_64_link_hash_entry *) h; |
| 3515 | |
| 3516 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle |
| 3517 | it here if it is defined in a non-shared object. */ |
| 3518 | if (h != NULL |
| 3519 | && h->type == STT_GNU_IFUNC |
| 3520 | && h->def_regular) |
| 3521 | { |
| 3522 | bfd_vma plt_index; |
| 3523 | const char *name; |
| 3524 | |
| 3525 | if ((input_section->flags & SEC_ALLOC) == 0 |
| 3526 | || h->plt.offset == (bfd_vma) -1) |
| 3527 | abort (); |
| 3528 | |
| 3529 | /* STT_GNU_IFUNC symbol must go through PLT. */ |
| 3530 | if (htab->elf.splt != NULL) |
| 3531 | { |
| 3532 | if (htab->plt_bnd != NULL) |
| 3533 | { |
| 3534 | resolved_plt = htab->plt_bnd; |
| 3535 | plt_offset = eh->plt_bnd.offset; |
| 3536 | } |
| 3537 | else |
| 3538 | { |
| 3539 | resolved_plt = htab->elf.splt; |
| 3540 | plt_offset = h->plt.offset; |
| 3541 | } |
| 3542 | } |
| 3543 | else |
| 3544 | { |
| 3545 | resolved_plt = htab->elf.iplt; |
| 3546 | plt_offset = h->plt.offset; |
| 3547 | } |
| 3548 | |
| 3549 | relocation = (resolved_plt->output_section->vma |
| 3550 | + resolved_plt->output_offset + plt_offset); |
| 3551 | |
| 3552 | switch (r_type) |
| 3553 | { |
| 3554 | default: |
| 3555 | if (h->root.root.string) |
| 3556 | name = h->root.root.string; |
| 3557 | else |
| 3558 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, |
| 3559 | NULL); |
| 3560 | (*_bfd_error_handler) |
| 3561 | (_("%B: relocation %s against STT_GNU_IFUNC " |
| 3562 | "symbol `%s' isn't handled by %s"), input_bfd, |
| 3563 | x86_64_elf_howto_table[r_type].name, |
| 3564 | name, __FUNCTION__); |
| 3565 | bfd_set_error (bfd_error_bad_value); |
| 3566 | return FALSE; |
| 3567 | |
| 3568 | case R_X86_64_32S: |
| 3569 | if (info->shared) |
| 3570 | abort (); |
| 3571 | goto do_relocation; |
| 3572 | |
| 3573 | case R_X86_64_32: |
| 3574 | if (ABI_64_P (output_bfd)) |
| 3575 | goto do_relocation; |
| 3576 | /* FALLTHROUGH */ |
| 3577 | case R_X86_64_64: |
| 3578 | if (rel->r_addend != 0) |
| 3579 | { |
| 3580 | if (h->root.root.string) |
| 3581 | name = h->root.root.string; |
| 3582 | else |
| 3583 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, |
| 3584 | sym, NULL); |
| 3585 | (*_bfd_error_handler) |
| 3586 | (_("%B: relocation %s against STT_GNU_IFUNC " |
| 3587 | "symbol `%s' has non-zero addend: %d"), |
| 3588 | input_bfd, x86_64_elf_howto_table[r_type].name, |
| 3589 | name, rel->r_addend); |
| 3590 | bfd_set_error (bfd_error_bad_value); |
| 3591 | return FALSE; |
| 3592 | } |
| 3593 | |
| 3594 | /* Generate dynamic relcoation only when there is a |
| 3595 | non-GOT reference in a shared object. */ |
| 3596 | if (info->shared && h->non_got_ref) |
| 3597 | { |
| 3598 | Elf_Internal_Rela outrel; |
| 3599 | asection *sreloc; |
| 3600 | |
| 3601 | /* Need a dynamic relocation to get the real function |
| 3602 | address. */ |
| 3603 | outrel.r_offset = _bfd_elf_section_offset (output_bfd, |
| 3604 | info, |
| 3605 | input_section, |
| 3606 | rel->r_offset); |
| 3607 | if (outrel.r_offset == (bfd_vma) -1 |
| 3608 | || outrel.r_offset == (bfd_vma) -2) |
| 3609 | abort (); |
| 3610 | |
| 3611 | outrel.r_offset += (input_section->output_section->vma |
| 3612 | + input_section->output_offset); |
| 3613 | |
| 3614 | if (h->dynindx == -1 |
| 3615 | || h->forced_local |
| 3616 | || info->executable) |
| 3617 | { |
| 3618 | /* This symbol is resolved locally. */ |
| 3619 | outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE); |
| 3620 | outrel.r_addend = (h->root.u.def.value |
| 3621 | + h->root.u.def.section->output_section->vma |
| 3622 | + h->root.u.def.section->output_offset); |
| 3623 | } |
| 3624 | else |
| 3625 | { |
| 3626 | outrel.r_info = htab->r_info (h->dynindx, r_type); |
| 3627 | outrel.r_addend = 0; |
| 3628 | } |
| 3629 | |
| 3630 | sreloc = htab->elf.irelifunc; |
| 3631 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 3632 | |
| 3633 | /* If this reloc is against an external symbol, we |
| 3634 | do not want to fiddle with the addend. Otherwise, |
| 3635 | we need to include the symbol value so that it |
| 3636 | becomes an addend for the dynamic reloc. For an |
| 3637 | internal symbol, we have updated addend. */ |
| 3638 | continue; |
| 3639 | } |
| 3640 | /* FALLTHROUGH */ |
| 3641 | case R_X86_64_PC32: |
| 3642 | case R_X86_64_PC32_BND: |
| 3643 | case R_X86_64_PC64: |
| 3644 | case R_X86_64_PLT32: |
| 3645 | case R_X86_64_PLT32_BND: |
| 3646 | goto do_relocation; |
| 3647 | |
| 3648 | case R_X86_64_GOTPCREL: |
| 3649 | case R_X86_64_GOTPCREL64: |
| 3650 | base_got = htab->elf.sgot; |
| 3651 | off = h->got.offset; |
| 3652 | |
| 3653 | if (base_got == NULL) |
| 3654 | abort (); |
| 3655 | |
| 3656 | if (off == (bfd_vma) -1) |
| 3657 | { |
| 3658 | /* We can't use h->got.offset here to save state, or |
| 3659 | even just remember the offset, as finish_dynamic_symbol |
| 3660 | would use that as offset into .got. */ |
| 3661 | |
| 3662 | if (htab->elf.splt != NULL) |
| 3663 | { |
| 3664 | plt_index = h->plt.offset / plt_entry_size - 1; |
| 3665 | off = (plt_index + 3) * GOT_ENTRY_SIZE; |
| 3666 | base_got = htab->elf.sgotplt; |
| 3667 | } |
| 3668 | else |
| 3669 | { |
| 3670 | plt_index = h->plt.offset / plt_entry_size; |
| 3671 | off = plt_index * GOT_ENTRY_SIZE; |
| 3672 | base_got = htab->elf.igotplt; |
| 3673 | } |
| 3674 | |
| 3675 | if (h->dynindx == -1 |
| 3676 | || h->forced_local |
| 3677 | || info->symbolic) |
| 3678 | { |
| 3679 | /* This references the local defitionion. We must |
| 3680 | initialize this entry in the global offset table. |
| 3681 | Since the offset must always be a multiple of 8, |
| 3682 | we use the least significant bit to record |
| 3683 | whether we have initialized it already. |
| 3684 | |
| 3685 | When doing a dynamic link, we create a .rela.got |
| 3686 | relocation entry to initialize the value. This |
| 3687 | is done in the finish_dynamic_symbol routine. */ |
| 3688 | if ((off & 1) != 0) |
| 3689 | off &= ~1; |
| 3690 | else |
| 3691 | { |
| 3692 | bfd_put_64 (output_bfd, relocation, |
| 3693 | base_got->contents + off); |
| 3694 | /* Note that this is harmless for the GOTPLT64 |
| 3695 | case, as -1 | 1 still is -1. */ |
| 3696 | h->got.offset |= 1; |
| 3697 | } |
| 3698 | } |
| 3699 | } |
| 3700 | |
| 3701 | relocation = (base_got->output_section->vma |
| 3702 | + base_got->output_offset + off); |
| 3703 | |
| 3704 | goto do_relocation; |
| 3705 | } |
| 3706 | } |
| 3707 | |
| 3708 | /* When generating a shared object, the relocations handled here are |
| 3709 | copied into the output file to be resolved at run time. */ |
| 3710 | switch (r_type) |
| 3711 | { |
| 3712 | case R_X86_64_GOT32: |
| 3713 | case R_X86_64_GOT64: |
| 3714 | /* Relocation is to the entry for this symbol in the global |
| 3715 | offset table. */ |
| 3716 | case R_X86_64_GOTPCREL: |
| 3717 | case R_X86_64_GOTPCREL64: |
| 3718 | /* Use global offset table entry as symbol value. */ |
| 3719 | case R_X86_64_GOTPLT64: |
| 3720 | /* This is the same as GOT64 for relocation purposes, but |
| 3721 | indicates the existence of a PLT entry. The difficulty is, |
| 3722 | that we must calculate the GOT slot offset from the PLT |
| 3723 | offset, if this symbol got a PLT entry (it was global). |
| 3724 | Additionally if it's computed from the PLT entry, then that |
| 3725 | GOT offset is relative to .got.plt, not to .got. */ |
| 3726 | base_got = htab->elf.sgot; |
| 3727 | |
| 3728 | if (htab->elf.sgot == NULL) |
| 3729 | abort (); |
| 3730 | |
| 3731 | if (h != NULL) |
| 3732 | { |
| 3733 | bfd_boolean dyn; |
| 3734 | |
| 3735 | off = h->got.offset; |
| 3736 | if (h->needs_plt |
| 3737 | && h->plt.offset != (bfd_vma)-1 |
| 3738 | && off == (bfd_vma)-1) |
| 3739 | { |
| 3740 | /* We can't use h->got.offset here to save |
| 3741 | state, or even just remember the offset, as |
| 3742 | finish_dynamic_symbol would use that as offset into |
| 3743 | .got. */ |
| 3744 | bfd_vma plt_index = h->plt.offset / plt_entry_size - 1; |
| 3745 | off = (plt_index + 3) * GOT_ENTRY_SIZE; |
| 3746 | base_got = htab->elf.sgotplt; |
| 3747 | } |
| 3748 | |
| 3749 | dyn = htab->elf.dynamic_sections_created; |
| 3750 | |
| 3751 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| 3752 | || (info->shared |
| 3753 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 3754 | || (ELF_ST_VISIBILITY (h->other) |
| 3755 | && h->root.type == bfd_link_hash_undefweak)) |
| 3756 | { |
| 3757 | /* This is actually a static link, or it is a -Bsymbolic |
| 3758 | link and the symbol is defined locally, or the symbol |
| 3759 | was forced to be local because of a version file. We |
| 3760 | must initialize this entry in the global offset table. |
| 3761 | Since the offset must always be a multiple of 8, we |
| 3762 | use the least significant bit to record whether we |
| 3763 | have initialized it already. |
| 3764 | |
| 3765 | When doing a dynamic link, we create a .rela.got |
| 3766 | relocation entry to initialize the value. This is |
| 3767 | done in the finish_dynamic_symbol routine. */ |
| 3768 | if ((off & 1) != 0) |
| 3769 | off &= ~1; |
| 3770 | else |
| 3771 | { |
| 3772 | bfd_put_64 (output_bfd, relocation, |
| 3773 | base_got->contents + off); |
| 3774 | /* Note that this is harmless for the GOTPLT64 case, |
| 3775 | as -1 | 1 still is -1. */ |
| 3776 | h->got.offset |= 1; |
| 3777 | } |
| 3778 | } |
| 3779 | else |
| 3780 | unresolved_reloc = FALSE; |
| 3781 | } |
| 3782 | else |
| 3783 | { |
| 3784 | if (local_got_offsets == NULL) |
| 3785 | abort (); |
| 3786 | |
| 3787 | off = local_got_offsets[r_symndx]; |
| 3788 | |
| 3789 | /* The offset must always be a multiple of 8. We use |
| 3790 | the least significant bit to record whether we have |
| 3791 | already generated the necessary reloc. */ |
| 3792 | if ((off & 1) != 0) |
| 3793 | off &= ~1; |
| 3794 | else |
| 3795 | { |
| 3796 | bfd_put_64 (output_bfd, relocation, |
| 3797 | base_got->contents + off); |
| 3798 | |
| 3799 | if (info->shared) |
| 3800 | { |
| 3801 | asection *s; |
| 3802 | Elf_Internal_Rela outrel; |
| 3803 | |
| 3804 | /* We need to generate a R_X86_64_RELATIVE reloc |
| 3805 | for the dynamic linker. */ |
| 3806 | s = htab->elf.srelgot; |
| 3807 | if (s == NULL) |
| 3808 | abort (); |
| 3809 | |
| 3810 | outrel.r_offset = (base_got->output_section->vma |
| 3811 | + base_got->output_offset |
| 3812 | + off); |
| 3813 | outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE); |
| 3814 | outrel.r_addend = relocation; |
| 3815 | elf_append_rela (output_bfd, s, &outrel); |
| 3816 | } |
| 3817 | |
| 3818 | local_got_offsets[r_symndx] |= 1; |
| 3819 | } |
| 3820 | } |
| 3821 | |
| 3822 | if (off >= (bfd_vma) -2) |
| 3823 | abort (); |
| 3824 | |
| 3825 | relocation = base_got->output_section->vma |
| 3826 | + base_got->output_offset + off; |
| 3827 | if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64) |
| 3828 | relocation -= htab->elf.sgotplt->output_section->vma |
| 3829 | - htab->elf.sgotplt->output_offset; |
| 3830 | |
| 3831 | break; |
| 3832 | |
| 3833 | case R_X86_64_GOTOFF64: |
| 3834 | /* Relocation is relative to the start of the global offset |
| 3835 | table. */ |
| 3836 | |
| 3837 | /* Check to make sure it isn't a protected function symbol |
| 3838 | for shared library since it may not be local when used |
| 3839 | as function address. */ |
| 3840 | if (!info->executable |
| 3841 | && h |
| 3842 | && !SYMBOLIC_BIND (info, h) |
| 3843 | && h->def_regular |
| 3844 | && h->type == STT_FUNC |
| 3845 | && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 3846 | { |
| 3847 | (*_bfd_error_handler) |
| 3848 | (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"), |
| 3849 | input_bfd, h->root.root.string); |
| 3850 | bfd_set_error (bfd_error_bad_value); |
| 3851 | return FALSE; |
| 3852 | } |
| 3853 | |
| 3854 | /* Note that sgot is not involved in this |
| 3855 | calculation. We always want the start of .got.plt. If we |
| 3856 | defined _GLOBAL_OFFSET_TABLE_ in a different way, as is |
| 3857 | permitted by the ABI, we might have to change this |
| 3858 | calculation. */ |
| 3859 | relocation -= htab->elf.sgotplt->output_section->vma |
| 3860 | + htab->elf.sgotplt->output_offset; |
| 3861 | break; |
| 3862 | |
| 3863 | case R_X86_64_GOTPC32: |
| 3864 | case R_X86_64_GOTPC64: |
| 3865 | /* Use global offset table as symbol value. */ |
| 3866 | relocation = htab->elf.sgotplt->output_section->vma |
| 3867 | + htab->elf.sgotplt->output_offset; |
| 3868 | unresolved_reloc = FALSE; |
| 3869 | break; |
| 3870 | |
| 3871 | case R_X86_64_PLTOFF64: |
| 3872 | /* Relocation is PLT entry relative to GOT. For local |
| 3873 | symbols it's the symbol itself relative to GOT. */ |
| 3874 | if (h != NULL |
| 3875 | /* See PLT32 handling. */ |
| 3876 | && h->plt.offset != (bfd_vma) -1 |
| 3877 | && htab->elf.splt != NULL) |
| 3878 | { |
| 3879 | if (htab->plt_bnd != NULL) |
| 3880 | { |
| 3881 | resolved_plt = htab->plt_bnd; |
| 3882 | plt_offset = eh->plt_bnd.offset; |
| 3883 | } |
| 3884 | else |
| 3885 | { |
| 3886 | resolved_plt = htab->elf.splt; |
| 3887 | plt_offset = h->plt.offset; |
| 3888 | } |
| 3889 | |
| 3890 | relocation = (resolved_plt->output_section->vma |
| 3891 | + resolved_plt->output_offset |
| 3892 | + plt_offset); |
| 3893 | unresolved_reloc = FALSE; |
| 3894 | } |
| 3895 | |
| 3896 | relocation -= htab->elf.sgotplt->output_section->vma |
| 3897 | + htab->elf.sgotplt->output_offset; |
| 3898 | break; |
| 3899 | |
| 3900 | case R_X86_64_PLT32: |
| 3901 | case R_X86_64_PLT32_BND: |
| 3902 | /* Relocation is to the entry for this symbol in the |
| 3903 | procedure linkage table. */ |
| 3904 | |
| 3905 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 3906 | without using the procedure linkage table. */ |
| 3907 | if (h == NULL) |
| 3908 | break; |
| 3909 | |
| 3910 | if (h->plt.offset == (bfd_vma) -1 |
| 3911 | || htab->elf.splt == NULL) |
| 3912 | { |
| 3913 | /* We didn't make a PLT entry for this symbol. This |
| 3914 | happens when statically linking PIC code, or when |
| 3915 | using -Bsymbolic. */ |
| 3916 | break; |
| 3917 | } |
| 3918 | |
| 3919 | if (htab->plt_bnd != NULL) |
| 3920 | { |
| 3921 | resolved_plt = htab->plt_bnd; |
| 3922 | plt_offset = eh->plt_bnd.offset; |
| 3923 | } |
| 3924 | else |
| 3925 | { |
| 3926 | resolved_plt = htab->elf.splt; |
| 3927 | plt_offset = h->plt.offset; |
| 3928 | } |
| 3929 | |
| 3930 | relocation = (resolved_plt->output_section->vma |
| 3931 | + resolved_plt->output_offset |
| 3932 | + plt_offset); |
| 3933 | unresolved_reloc = FALSE; |
| 3934 | break; |
| 3935 | |
| 3936 | case R_X86_64_SIZE32: |
| 3937 | case R_X86_64_SIZE64: |
| 3938 | /* Set to symbol size. */ |
| 3939 | relocation = st_size; |
| 3940 | goto direct; |
| 3941 | |
| 3942 | case R_X86_64_PC8: |
| 3943 | case R_X86_64_PC16: |
| 3944 | case R_X86_64_PC32: |
| 3945 | case R_X86_64_PC32_BND: |
| 3946 | if (info->shared |
| 3947 | && (input_section->flags & SEC_ALLOC) != 0 |
| 3948 | && (input_section->flags & SEC_READONLY) != 0 |
| 3949 | && h != NULL) |
| 3950 | { |
| 3951 | bfd_boolean fail = FALSE; |
| 3952 | bfd_boolean branch |
| 3953 | = ((r_type == R_X86_64_PC32 |
| 3954 | || r_type == R_X86_64_PC32_BND) |
| 3955 | && is_32bit_relative_branch (contents, rel->r_offset)); |
| 3956 | |
| 3957 | if (SYMBOL_REFERENCES_LOCAL (info, h)) |
| 3958 | { |
| 3959 | /* Symbol is referenced locally. Make sure it is |
| 3960 | defined locally or for a branch. */ |
| 3961 | fail = !h->def_regular && !branch; |
| 3962 | } |
| 3963 | else |
| 3964 | { |
| 3965 | /* Symbol isn't referenced locally. We only allow |
| 3966 | branch to symbol with non-default visibility. */ |
| 3967 | fail = (!branch |
| 3968 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT); |
| 3969 | } |
| 3970 | |
| 3971 | if (fail) |
| 3972 | { |
| 3973 | const char *fmt; |
| 3974 | const char *v; |
| 3975 | const char *pic = ""; |
| 3976 | |
| 3977 | switch (ELF_ST_VISIBILITY (h->other)) |
| 3978 | { |
| 3979 | case STV_HIDDEN: |
| 3980 | v = _("hidden symbol"); |
| 3981 | break; |
| 3982 | case STV_INTERNAL: |
| 3983 | v = _("internal symbol"); |
| 3984 | break; |
| 3985 | case STV_PROTECTED: |
| 3986 | v = _("protected symbol"); |
| 3987 | break; |
| 3988 | default: |
| 3989 | v = _("symbol"); |
| 3990 | pic = _("; recompile with -fPIC"); |
| 3991 | break; |
| 3992 | } |
| 3993 | |
| 3994 | if (h->def_regular) |
| 3995 | fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s"); |
| 3996 | else |
| 3997 | fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s"); |
| 3998 | |
| 3999 | (*_bfd_error_handler) (fmt, input_bfd, |
| 4000 | x86_64_elf_howto_table[r_type].name, |
| 4001 | v, h->root.root.string, pic); |
| 4002 | bfd_set_error (bfd_error_bad_value); |
| 4003 | return FALSE; |
| 4004 | } |
| 4005 | } |
| 4006 | /* Fall through. */ |
| 4007 | |
| 4008 | case R_X86_64_8: |
| 4009 | case R_X86_64_16: |
| 4010 | case R_X86_64_32: |
| 4011 | case R_X86_64_PC64: |
| 4012 | case R_X86_64_64: |
| 4013 | /* FIXME: The ABI says the linker should make sure the value is |
| 4014 | the same when it's zeroextended to 64 bit. */ |
| 4015 | |
| 4016 | direct: |
| 4017 | if ((input_section->flags & SEC_ALLOC) == 0) |
| 4018 | break; |
| 4019 | |
| 4020 | if ((info->shared |
| 4021 | && (h == NULL |
| 4022 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 4023 | || h->root.type != bfd_link_hash_undefweak) |
| 4024 | && ((! IS_X86_64_PCREL_TYPE (r_type) |
| 4025 | && r_type != R_X86_64_SIZE32 |
| 4026 | && r_type != R_X86_64_SIZE64) |
| 4027 | || ! SYMBOL_CALLS_LOCAL (info, h))) |
| 4028 | || (ELIMINATE_COPY_RELOCS |
| 4029 | && !info->shared |
| 4030 | && h != NULL |
| 4031 | && h->dynindx != -1 |
| 4032 | && !h->non_got_ref |
| 4033 | && ((h->def_dynamic |
| 4034 | && !h->def_regular) |
| 4035 | || h->root.type == bfd_link_hash_undefweak |
| 4036 | || h->root.type == bfd_link_hash_undefined))) |
| 4037 | { |
| 4038 | Elf_Internal_Rela outrel; |
| 4039 | bfd_boolean skip, relocate; |
| 4040 | asection *sreloc; |
| 4041 | |
| 4042 | /* When generating a shared object, these relocations |
| 4043 | are copied into the output file to be resolved at run |
| 4044 | time. */ |
| 4045 | skip = FALSE; |
| 4046 | relocate = FALSE; |
| 4047 | |
| 4048 | outrel.r_offset = |
| 4049 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 4050 | rel->r_offset); |
| 4051 | if (outrel.r_offset == (bfd_vma) -1) |
| 4052 | skip = TRUE; |
| 4053 | else if (outrel.r_offset == (bfd_vma) -2) |
| 4054 | skip = TRUE, relocate = TRUE; |
| 4055 | |
| 4056 | outrel.r_offset += (input_section->output_section->vma |
| 4057 | + input_section->output_offset); |
| 4058 | |
| 4059 | if (skip) |
| 4060 | memset (&outrel, 0, sizeof outrel); |
| 4061 | |
| 4062 | /* h->dynindx may be -1 if this symbol was marked to |
| 4063 | become local. */ |
| 4064 | else if (h != NULL |
| 4065 | && h->dynindx != -1 |
| 4066 | && (IS_X86_64_PCREL_TYPE (r_type) |
| 4067 | || ! info->shared |
| 4068 | || ! SYMBOLIC_BIND (info, h) |
| 4069 | || ! h->def_regular)) |
| 4070 | { |
| 4071 | outrel.r_info = htab->r_info (h->dynindx, r_type); |
| 4072 | outrel.r_addend = rel->r_addend; |
| 4073 | } |
| 4074 | else |
| 4075 | { |
| 4076 | /* This symbol is local, or marked to become local. */ |
| 4077 | if (r_type == htab->pointer_r_type) |
| 4078 | { |
| 4079 | relocate = TRUE; |
| 4080 | outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE); |
| 4081 | outrel.r_addend = relocation + rel->r_addend; |
| 4082 | } |
| 4083 | else if (r_type == R_X86_64_64 |
| 4084 | && !ABI_64_P (output_bfd)) |
| 4085 | { |
| 4086 | relocate = TRUE; |
| 4087 | outrel.r_info = htab->r_info (0, |
| 4088 | R_X86_64_RELATIVE64); |
| 4089 | outrel.r_addend = relocation + rel->r_addend; |
| 4090 | /* Check addend overflow. */ |
| 4091 | if ((outrel.r_addend & 0x80000000) |
| 4092 | != (rel->r_addend & 0x80000000)) |
| 4093 | { |
| 4094 | const char *name; |
| 4095 | int addend = rel->r_addend; |
| 4096 | if (h && h->root.root.string) |
| 4097 | name = h->root.root.string; |
| 4098 | else |
| 4099 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, |
| 4100 | sym, NULL); |
| 4101 | if (addend < 0) |
| 4102 | (*_bfd_error_handler) |
| 4103 | (_("%B: addend -0x%x in relocation %s against " |
| 4104 | "symbol `%s' at 0x%lx in section `%A' is " |
| 4105 | "out of range"), |
| 4106 | input_bfd, input_section, addend, |
| 4107 | x86_64_elf_howto_table[r_type].name, |
| 4108 | name, (unsigned long) rel->r_offset); |
| 4109 | else |
| 4110 | (*_bfd_error_handler) |
| 4111 | (_("%B: addend 0x%x in relocation %s against " |
| 4112 | "symbol `%s' at 0x%lx in section `%A' is " |
| 4113 | "out of range"), |
| 4114 | input_bfd, input_section, addend, |
| 4115 | x86_64_elf_howto_table[r_type].name, |
| 4116 | name, (unsigned long) rel->r_offset); |
| 4117 | bfd_set_error (bfd_error_bad_value); |
| 4118 | return FALSE; |
| 4119 | } |
| 4120 | } |
| 4121 | else |
| 4122 | { |
| 4123 | long sindx; |
| 4124 | |
| 4125 | if (bfd_is_abs_section (sec)) |
| 4126 | sindx = 0; |
| 4127 | else if (sec == NULL || sec->owner == NULL) |
| 4128 | { |
| 4129 | bfd_set_error (bfd_error_bad_value); |
| 4130 | return FALSE; |
| 4131 | } |
| 4132 | else |
| 4133 | { |
| 4134 | asection *osec; |
| 4135 | |
| 4136 | /* We are turning this relocation into one |
| 4137 | against a section symbol. It would be |
| 4138 | proper to subtract the symbol's value, |
| 4139 | osec->vma, from the emitted reloc addend, |
| 4140 | but ld.so expects buggy relocs. */ |
| 4141 | osec = sec->output_section; |
| 4142 | sindx = elf_section_data (osec)->dynindx; |
| 4143 | if (sindx == 0) |
| 4144 | { |
| 4145 | asection *oi = htab->elf.text_index_section; |
| 4146 | sindx = elf_section_data (oi)->dynindx; |
| 4147 | } |
| 4148 | BFD_ASSERT (sindx != 0); |
| 4149 | } |
| 4150 | |
| 4151 | outrel.r_info = htab->r_info (sindx, r_type); |
| 4152 | outrel.r_addend = relocation + rel->r_addend; |
| 4153 | } |
| 4154 | } |
| 4155 | |
| 4156 | sreloc = elf_section_data (input_section)->sreloc; |
| 4157 | |
| 4158 | if (sreloc == NULL || sreloc->contents == NULL) |
| 4159 | { |
| 4160 | r = bfd_reloc_notsupported; |
| 4161 | goto check_relocation_error; |
| 4162 | } |
| 4163 | |
| 4164 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 4165 | |
| 4166 | /* If this reloc is against an external symbol, we do |
| 4167 | not want to fiddle with the addend. Otherwise, we |
| 4168 | need to include the symbol value so that it becomes |
| 4169 | an addend for the dynamic reloc. */ |
| 4170 | if (! relocate) |
| 4171 | continue; |
| 4172 | } |
| 4173 | |
| 4174 | break; |
| 4175 | |
| 4176 | case R_X86_64_TLSGD: |
| 4177 | case R_X86_64_GOTPC32_TLSDESC: |
| 4178 | case R_X86_64_TLSDESC_CALL: |
| 4179 | case R_X86_64_GOTTPOFF: |
| 4180 | tls_type = GOT_UNKNOWN; |
| 4181 | if (h == NULL && local_got_offsets) |
| 4182 | tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx]; |
| 4183 | else if (h != NULL) |
| 4184 | tls_type = elf_x86_64_hash_entry (h)->tls_type; |
| 4185 | |
| 4186 | if (! elf_x86_64_tls_transition (info, input_bfd, |
| 4187 | input_section, contents, |
| 4188 | symtab_hdr, sym_hashes, |
| 4189 | &r_type, tls_type, rel, |
| 4190 | relend, h, r_symndx)) |
| 4191 | return FALSE; |
| 4192 | |
| 4193 | if (r_type == R_X86_64_TPOFF32) |
| 4194 | { |
| 4195 | bfd_vma roff = rel->r_offset; |
| 4196 | |
| 4197 | BFD_ASSERT (! unresolved_reloc); |
| 4198 | |
| 4199 | if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD) |
| 4200 | { |
| 4201 | /* GD->LE transition. For 64bit, change |
| 4202 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 4203 | .word 0x6666; rex64; call __tls_get_addr |
| 4204 | into: |
| 4205 | movq %fs:0, %rax |
| 4206 | leaq foo@tpoff(%rax), %rax |
| 4207 | For 32bit, change |
| 4208 | leaq foo@tlsgd(%rip), %rdi |
| 4209 | .word 0x6666; rex64; call __tls_get_addr |
| 4210 | into: |
| 4211 | movl %fs:0, %eax |
| 4212 | leaq foo@tpoff(%rax), %rax |
| 4213 | For largepic, change: |
| 4214 | leaq foo@tlsgd(%rip), %rdi |
| 4215 | movabsq $__tls_get_addr@pltoff, %rax |
| 4216 | addq %rbx, %rax |
| 4217 | call *%rax |
| 4218 | into: |
| 4219 | movq %fs:0, %rax |
| 4220 | leaq foo@tpoff(%rax), %rax |
| 4221 | nopw 0x0(%rax,%rax,1) */ |
| 4222 | int largepic = 0; |
| 4223 | if (ABI_64_P (output_bfd) |
| 4224 | && contents[roff + 5] == (bfd_byte) '\xb8') |
| 4225 | { |
| 4226 | memcpy (contents + roff - 3, |
| 4227 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80" |
| 4228 | "\0\0\0\0\x66\x0f\x1f\x44\0", 22); |
| 4229 | largepic = 1; |
| 4230 | } |
| 4231 | else if (ABI_64_P (output_bfd)) |
| 4232 | memcpy (contents + roff - 4, |
| 4233 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", |
| 4234 | 16); |
| 4235 | else |
| 4236 | memcpy (contents + roff - 3, |
| 4237 | "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", |
| 4238 | 15); |
| 4239 | bfd_put_32 (output_bfd, |
| 4240 | elf_x86_64_tpoff (info, relocation), |
| 4241 | contents + roff + 8 + largepic); |
| 4242 | /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */ |
| 4243 | rel++; |
| 4244 | continue; |
| 4245 | } |
| 4246 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) |
| 4247 | { |
| 4248 | /* GDesc -> LE transition. |
| 4249 | It's originally something like: |
| 4250 | leaq x@tlsdesc(%rip), %rax |
| 4251 | |
| 4252 | Change it to: |
| 4253 | movl $x@tpoff, %rax. */ |
| 4254 | |
| 4255 | unsigned int val, type; |
| 4256 | |
| 4257 | type = bfd_get_8 (input_bfd, contents + roff - 3); |
| 4258 | val = bfd_get_8 (input_bfd, contents + roff - 1); |
| 4259 | bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1), |
| 4260 | contents + roff - 3); |
| 4261 | bfd_put_8 (output_bfd, 0xc7, contents + roff - 2); |
| 4262 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 4263 | contents + roff - 1); |
| 4264 | bfd_put_32 (output_bfd, |
| 4265 | elf_x86_64_tpoff (info, relocation), |
| 4266 | contents + roff); |
| 4267 | continue; |
| 4268 | } |
| 4269 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) |
| 4270 | { |
| 4271 | /* GDesc -> LE transition. |
| 4272 | It's originally: |
| 4273 | call *(%rax) |
| 4274 | Turn it into: |
| 4275 | xchg %ax,%ax. */ |
| 4276 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 4277 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 4278 | continue; |
| 4279 | } |
| 4280 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF) |
| 4281 | { |
| 4282 | /* IE->LE transition: |
| 4283 | Originally it can be one of: |
| 4284 | movq foo@gottpoff(%rip), %reg |
| 4285 | addq foo@gottpoff(%rip), %reg |
| 4286 | We change it into: |
| 4287 | movq $foo, %reg |
| 4288 | leaq foo(%reg), %reg |
| 4289 | addq $foo, %reg. */ |
| 4290 | |
| 4291 | unsigned int val, type, reg; |
| 4292 | |
| 4293 | val = bfd_get_8 (input_bfd, contents + roff - 3); |
| 4294 | type = bfd_get_8 (input_bfd, contents + roff - 2); |
| 4295 | reg = bfd_get_8 (input_bfd, contents + roff - 1); |
| 4296 | reg >>= 3; |
| 4297 | if (type == 0x8b) |
| 4298 | { |
| 4299 | /* movq */ |
| 4300 | if (val == 0x4c) |
| 4301 | bfd_put_8 (output_bfd, 0x49, |
| 4302 | contents + roff - 3); |
| 4303 | else if (!ABI_64_P (output_bfd) && val == 0x44) |
| 4304 | bfd_put_8 (output_bfd, 0x41, |
| 4305 | contents + roff - 3); |
| 4306 | bfd_put_8 (output_bfd, 0xc7, |
| 4307 | contents + roff - 2); |
| 4308 | bfd_put_8 (output_bfd, 0xc0 | reg, |
| 4309 | contents + roff - 1); |
| 4310 | } |
| 4311 | else if (reg == 4) |
| 4312 | { |
| 4313 | /* addq -> addq - addressing with %rsp/%r12 is |
| 4314 | special */ |
| 4315 | if (val == 0x4c) |
| 4316 | bfd_put_8 (output_bfd, 0x49, |
| 4317 | contents + roff - 3); |
| 4318 | else if (!ABI_64_P (output_bfd) && val == 0x44) |
| 4319 | bfd_put_8 (output_bfd, 0x41, |
| 4320 | contents + roff - 3); |
| 4321 | bfd_put_8 (output_bfd, 0x81, |
| 4322 | contents + roff - 2); |
| 4323 | bfd_put_8 (output_bfd, 0xc0 | reg, |
| 4324 | contents + roff - 1); |
| 4325 | } |
| 4326 | else |
| 4327 | { |
| 4328 | /* addq -> leaq */ |
| 4329 | if (val == 0x4c) |
| 4330 | bfd_put_8 (output_bfd, 0x4d, |
| 4331 | contents + roff - 3); |
| 4332 | else if (!ABI_64_P (output_bfd) && val == 0x44) |
| 4333 | bfd_put_8 (output_bfd, 0x45, |
| 4334 | contents + roff - 3); |
| 4335 | bfd_put_8 (output_bfd, 0x8d, |
| 4336 | contents + roff - 2); |
| 4337 | bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), |
| 4338 | contents + roff - 1); |
| 4339 | } |
| 4340 | bfd_put_32 (output_bfd, |
| 4341 | elf_x86_64_tpoff (info, relocation), |
| 4342 | contents + roff); |
| 4343 | continue; |
| 4344 | } |
| 4345 | else |
| 4346 | BFD_ASSERT (FALSE); |
| 4347 | } |
| 4348 | |
| 4349 | if (htab->elf.sgot == NULL) |
| 4350 | abort (); |
| 4351 | |
| 4352 | if (h != NULL) |
| 4353 | { |
| 4354 | off = h->got.offset; |
| 4355 | offplt = elf_x86_64_hash_entry (h)->tlsdesc_got; |
| 4356 | } |
| 4357 | else |
| 4358 | { |
| 4359 | if (local_got_offsets == NULL) |
| 4360 | abort (); |
| 4361 | |
| 4362 | off = local_got_offsets[r_symndx]; |
| 4363 | offplt = local_tlsdesc_gotents[r_symndx]; |
| 4364 | } |
| 4365 | |
| 4366 | if ((off & 1) != 0) |
| 4367 | off &= ~1; |
| 4368 | else |
| 4369 | { |
| 4370 | Elf_Internal_Rela outrel; |
| 4371 | int dr_type, indx; |
| 4372 | asection *sreloc; |
| 4373 | |
| 4374 | if (htab->elf.srelgot == NULL) |
| 4375 | abort (); |
| 4376 | |
| 4377 | indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| 4378 | |
| 4379 | if (GOT_TLS_GDESC_P (tls_type)) |
| 4380 | { |
| 4381 | outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC); |
| 4382 | BFD_ASSERT (htab->sgotplt_jump_table_size + offplt |
| 4383 | + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size); |
| 4384 | outrel.r_offset = (htab->elf.sgotplt->output_section->vma |
| 4385 | + htab->elf.sgotplt->output_offset |
| 4386 | + offplt |
| 4387 | + htab->sgotplt_jump_table_size); |
| 4388 | sreloc = htab->elf.srelplt; |
| 4389 | if (indx == 0) |
| 4390 | outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info); |
| 4391 | else |
| 4392 | outrel.r_addend = 0; |
| 4393 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 4394 | } |
| 4395 | |
| 4396 | sreloc = htab->elf.srelgot; |
| 4397 | |
| 4398 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 4399 | + htab->elf.sgot->output_offset + off); |
| 4400 | |
| 4401 | if (GOT_TLS_GD_P (tls_type)) |
| 4402 | dr_type = R_X86_64_DTPMOD64; |
| 4403 | else if (GOT_TLS_GDESC_P (tls_type)) |
| 4404 | goto dr_done; |
| 4405 | else |
| 4406 | dr_type = R_X86_64_TPOFF64; |
| 4407 | |
| 4408 | bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off); |
| 4409 | outrel.r_addend = 0; |
| 4410 | if ((dr_type == R_X86_64_TPOFF64 |
| 4411 | || dr_type == R_X86_64_TLSDESC) && indx == 0) |
| 4412 | outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info); |
| 4413 | outrel.r_info = htab->r_info (indx, dr_type); |
| 4414 | |
| 4415 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 4416 | |
| 4417 | if (GOT_TLS_GD_P (tls_type)) |
| 4418 | { |
| 4419 | if (indx == 0) |
| 4420 | { |
| 4421 | BFD_ASSERT (! unresolved_reloc); |
| 4422 | bfd_put_64 (output_bfd, |
| 4423 | relocation - elf_x86_64_dtpoff_base (info), |
| 4424 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); |
| 4425 | } |
| 4426 | else |
| 4427 | { |
| 4428 | bfd_put_64 (output_bfd, 0, |
| 4429 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); |
| 4430 | outrel.r_info = htab->r_info (indx, |
| 4431 | R_X86_64_DTPOFF64); |
| 4432 | outrel.r_offset += GOT_ENTRY_SIZE; |
| 4433 | elf_append_rela (output_bfd, sreloc, |
| 4434 | &outrel); |
| 4435 | } |
| 4436 | } |
| 4437 | |
| 4438 | dr_done: |
| 4439 | if (h != NULL) |
| 4440 | h->got.offset |= 1; |
| 4441 | else |
| 4442 | local_got_offsets[r_symndx] |= 1; |
| 4443 | } |
| 4444 | |
| 4445 | if (off >= (bfd_vma) -2 |
| 4446 | && ! GOT_TLS_GDESC_P (tls_type)) |
| 4447 | abort (); |
| 4448 | if (r_type == ELF32_R_TYPE (rel->r_info)) |
| 4449 | { |
| 4450 | if (r_type == R_X86_64_GOTPC32_TLSDESC |
| 4451 | || r_type == R_X86_64_TLSDESC_CALL) |
| 4452 | relocation = htab->elf.sgotplt->output_section->vma |
| 4453 | + htab->elf.sgotplt->output_offset |
| 4454 | + offplt + htab->sgotplt_jump_table_size; |
| 4455 | else |
| 4456 | relocation = htab->elf.sgot->output_section->vma |
| 4457 | + htab->elf.sgot->output_offset + off; |
| 4458 | unresolved_reloc = FALSE; |
| 4459 | } |
| 4460 | else |
| 4461 | { |
| 4462 | bfd_vma roff = rel->r_offset; |
| 4463 | |
| 4464 | if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD) |
| 4465 | { |
| 4466 | /* GD->IE transition. For 64bit, change |
| 4467 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 4468 | .word 0x6666; rex64; call __tls_get_addr@plt |
| 4469 | into: |
| 4470 | movq %fs:0, %rax |
| 4471 | addq foo@gottpoff(%rip), %rax |
| 4472 | For 32bit, change |
| 4473 | leaq foo@tlsgd(%rip), %rdi |
| 4474 | .word 0x6666; rex64; call __tls_get_addr@plt |
| 4475 | into: |
| 4476 | movl %fs:0, %eax |
| 4477 | addq foo@gottpoff(%rip), %rax |
| 4478 | For largepic, change: |
| 4479 | leaq foo@tlsgd(%rip), %rdi |
| 4480 | movabsq $__tls_get_addr@pltoff, %rax |
| 4481 | addq %rbx, %rax |
| 4482 | call *%rax |
| 4483 | into: |
| 4484 | movq %fs:0, %rax |
| 4485 | addq foo@gottpoff(%rax), %rax |
| 4486 | nopw 0x0(%rax,%rax,1) */ |
| 4487 | int largepic = 0; |
| 4488 | if (ABI_64_P (output_bfd) |
| 4489 | && contents[roff + 5] == (bfd_byte) '\xb8') |
| 4490 | { |
| 4491 | memcpy (contents + roff - 3, |
| 4492 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05" |
| 4493 | "\0\0\0\0\x66\x0f\x1f\x44\0", 22); |
| 4494 | largepic = 1; |
| 4495 | } |
| 4496 | else if (ABI_64_P (output_bfd)) |
| 4497 | memcpy (contents + roff - 4, |
| 4498 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", |
| 4499 | 16); |
| 4500 | else |
| 4501 | memcpy (contents + roff - 3, |
| 4502 | "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", |
| 4503 | 15); |
| 4504 | |
| 4505 | relocation = (htab->elf.sgot->output_section->vma |
| 4506 | + htab->elf.sgot->output_offset + off |
| 4507 | - roff |
| 4508 | - largepic |
| 4509 | - input_section->output_section->vma |
| 4510 | - input_section->output_offset |
| 4511 | - 12); |
| 4512 | bfd_put_32 (output_bfd, relocation, |
| 4513 | contents + roff + 8 + largepic); |
| 4514 | /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */ |
| 4515 | rel++; |
| 4516 | continue; |
| 4517 | } |
| 4518 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) |
| 4519 | { |
| 4520 | /* GDesc -> IE transition. |
| 4521 | It's originally something like: |
| 4522 | leaq x@tlsdesc(%rip), %rax |
| 4523 | |
| 4524 | Change it to: |
| 4525 | movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */ |
| 4526 | |
| 4527 | /* Now modify the instruction as appropriate. To |
| 4528 | turn a leaq into a movq in the form we use it, it |
| 4529 | suffices to change the second byte from 0x8d to |
| 4530 | 0x8b. */ |
| 4531 | bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); |
| 4532 | |
| 4533 | bfd_put_32 (output_bfd, |
| 4534 | htab->elf.sgot->output_section->vma |
| 4535 | + htab->elf.sgot->output_offset + off |
| 4536 | - rel->r_offset |
| 4537 | - input_section->output_section->vma |
| 4538 | - input_section->output_offset |
| 4539 | - 4, |
| 4540 | contents + roff); |
| 4541 | continue; |
| 4542 | } |
| 4543 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) |
| 4544 | { |
| 4545 | /* GDesc -> IE transition. |
| 4546 | It's originally: |
| 4547 | call *(%rax) |
| 4548 | |
| 4549 | Change it to: |
| 4550 | xchg %ax, %ax. */ |
| 4551 | |
| 4552 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 4553 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 4554 | continue; |
| 4555 | } |
| 4556 | else |
| 4557 | BFD_ASSERT (FALSE); |
| 4558 | } |
| 4559 | break; |
| 4560 | |
| 4561 | case R_X86_64_TLSLD: |
| 4562 | if (! elf_x86_64_tls_transition (info, input_bfd, |
| 4563 | input_section, contents, |
| 4564 | symtab_hdr, sym_hashes, |
| 4565 | &r_type, GOT_UNKNOWN, |
| 4566 | rel, relend, h, r_symndx)) |
| 4567 | return FALSE; |
| 4568 | |
| 4569 | if (r_type != R_X86_64_TLSLD) |
| 4570 | { |
| 4571 | /* LD->LE transition: |
| 4572 | leaq foo@tlsld(%rip), %rdi; call __tls_get_addr. |
| 4573 | For 64bit, we change it into: |
| 4574 | .word 0x6666; .byte 0x66; movq %fs:0, %rax. |
| 4575 | For 32bit, we change it into: |
| 4576 | nopl 0x0(%rax); movl %fs:0, %eax. |
| 4577 | For largepic, change: |
| 4578 | leaq foo@tlsgd(%rip), %rdi |
| 4579 | movabsq $__tls_get_addr@pltoff, %rax |
| 4580 | addq %rbx, %rax |
| 4581 | call *%rax |
| 4582 | into: |
| 4583 | data32 data32 data32 nopw %cs:0x0(%rax,%rax,1) |
| 4584 | movq %fs:0, %eax */ |
| 4585 | |
| 4586 | BFD_ASSERT (r_type == R_X86_64_TPOFF32); |
| 4587 | if (ABI_64_P (output_bfd) |
| 4588 | && contents[rel->r_offset + 5] == (bfd_byte) '\xb8') |
| 4589 | memcpy (contents + rel->r_offset - 3, |
| 4590 | "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0" |
| 4591 | "\x64\x48\x8b\x04\x25\0\0\0", 22); |
| 4592 | else if (ABI_64_P (output_bfd)) |
| 4593 | memcpy (contents + rel->r_offset - 3, |
| 4594 | "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); |
| 4595 | else |
| 4596 | memcpy (contents + rel->r_offset - 3, |
| 4597 | "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12); |
| 4598 | /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */ |
| 4599 | rel++; |
| 4600 | continue; |
| 4601 | } |
| 4602 | |
| 4603 | if (htab->elf.sgot == NULL) |
| 4604 | abort (); |
| 4605 | |
| 4606 | off = htab->tls_ld_got.offset; |
| 4607 | if (off & 1) |
| 4608 | off &= ~1; |
| 4609 | else |
| 4610 | { |
| 4611 | Elf_Internal_Rela outrel; |
| 4612 | |
| 4613 | if (htab->elf.srelgot == NULL) |
| 4614 | abort (); |
| 4615 | |
| 4616 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 4617 | + htab->elf.sgot->output_offset + off); |
| 4618 | |
| 4619 | bfd_put_64 (output_bfd, 0, |
| 4620 | htab->elf.sgot->contents + off); |
| 4621 | bfd_put_64 (output_bfd, 0, |
| 4622 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); |
| 4623 | outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64); |
| 4624 | outrel.r_addend = 0; |
| 4625 | elf_append_rela (output_bfd, htab->elf.srelgot, |
| 4626 | &outrel); |
| 4627 | htab->tls_ld_got.offset |= 1; |
| 4628 | } |
| 4629 | relocation = htab->elf.sgot->output_section->vma |
| 4630 | + htab->elf.sgot->output_offset + off; |
| 4631 | unresolved_reloc = FALSE; |
| 4632 | break; |
| 4633 | |
| 4634 | case R_X86_64_DTPOFF32: |
| 4635 | if (!info->executable|| (input_section->flags & SEC_CODE) == 0) |
| 4636 | relocation -= elf_x86_64_dtpoff_base (info); |
| 4637 | else |
| 4638 | relocation = elf_x86_64_tpoff (info, relocation); |
| 4639 | break; |
| 4640 | |
| 4641 | case R_X86_64_TPOFF32: |
| 4642 | case R_X86_64_TPOFF64: |
| 4643 | BFD_ASSERT (info->executable); |
| 4644 | relocation = elf_x86_64_tpoff (info, relocation); |
| 4645 | break; |
| 4646 | |
| 4647 | case R_X86_64_DTPOFF64: |
| 4648 | BFD_ASSERT ((input_section->flags & SEC_CODE) == 0); |
| 4649 | relocation -= elf_x86_64_dtpoff_base (info); |
| 4650 | break; |
| 4651 | |
| 4652 | default: |
| 4653 | break; |
| 4654 | } |
| 4655 | |
| 4656 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 4657 | because such sections are not SEC_ALLOC and thus ld.so will |
| 4658 | not process them. */ |
| 4659 | if (unresolved_reloc |
| 4660 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 4661 | && h->def_dynamic) |
| 4662 | && _bfd_elf_section_offset (output_bfd, info, input_section, |
| 4663 | rel->r_offset) != (bfd_vma) -1) |
| 4664 | { |
| 4665 | (*_bfd_error_handler) |
| 4666 | (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), |
| 4667 | input_bfd, |
| 4668 | input_section, |
| 4669 | (long) rel->r_offset, |
| 4670 | howto->name, |
| 4671 | h->root.root.string); |
| 4672 | return FALSE; |
| 4673 | } |
| 4674 | |
| 4675 | do_relocation: |
| 4676 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 4677 | contents, rel->r_offset, |
| 4678 | relocation, rel->r_addend); |
| 4679 | |
| 4680 | check_relocation_error: |
| 4681 | if (r != bfd_reloc_ok) |
| 4682 | { |
| 4683 | const char *name; |
| 4684 | |
| 4685 | if (h != NULL) |
| 4686 | name = h->root.root.string; |
| 4687 | else |
| 4688 | { |
| 4689 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 4690 | symtab_hdr->sh_link, |
| 4691 | sym->st_name); |
| 4692 | if (name == NULL) |
| 4693 | return FALSE; |
| 4694 | if (*name == '\0') |
| 4695 | name = bfd_section_name (input_bfd, sec); |
| 4696 | } |
| 4697 | |
| 4698 | if (r == bfd_reloc_overflow) |
| 4699 | { |
| 4700 | if (! ((*info->callbacks->reloc_overflow) |
| 4701 | (info, (h ? &h->root : NULL), name, howto->name, |
| 4702 | (bfd_vma) 0, input_bfd, input_section, |
| 4703 | rel->r_offset))) |
| 4704 | return FALSE; |
| 4705 | } |
| 4706 | else |
| 4707 | { |
| 4708 | (*_bfd_error_handler) |
| 4709 | (_("%B(%A+0x%lx): reloc against `%s': error %d"), |
| 4710 | input_bfd, input_section, |
| 4711 | (long) rel->r_offset, name, (int) r); |
| 4712 | return FALSE; |
| 4713 | } |
| 4714 | } |
| 4715 | } |
| 4716 | |
| 4717 | return TRUE; |
| 4718 | } |
| 4719 | |
| 4720 | /* Finish up dynamic symbol handling. We set the contents of various |
| 4721 | dynamic sections here. */ |
| 4722 | |
| 4723 | static bfd_boolean |
| 4724 | elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, |
| 4725 | struct bfd_link_info *info, |
| 4726 | struct elf_link_hash_entry *h, |
| 4727 | Elf_Internal_Sym *sym ATTRIBUTE_UNUSED) |
| 4728 | { |
| 4729 | struct elf_x86_64_link_hash_table *htab; |
| 4730 | const struct elf_x86_64_backend_data *abed; |
| 4731 | bfd_boolean use_plt_bnd; |
| 4732 | |
| 4733 | htab = elf_x86_64_hash_table (info); |
| 4734 | if (htab == NULL) |
| 4735 | return FALSE; |
| 4736 | |
| 4737 | /* Use MPX backend data in case of BND relocation. Use .plt_bnd |
| 4738 | section only if there is .plt section. */ |
| 4739 | use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL; |
| 4740 | abed = (use_plt_bnd |
| 4741 | ? &elf_x86_64_bnd_arch_bed |
| 4742 | : get_elf_x86_64_backend_data (output_bfd)); |
| 4743 | |
| 4744 | if (h->plt.offset != (bfd_vma) -1) |
| 4745 | { |
| 4746 | bfd_vma plt_index; |
| 4747 | bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset; |
| 4748 | bfd_vma plt_plt_insn_end, plt_got_insn_size; |
| 4749 | Elf_Internal_Rela rela; |
| 4750 | bfd_byte *loc; |
| 4751 | asection *plt, *gotplt, *relplt, *resolved_plt; |
| 4752 | const struct elf_backend_data *bed; |
| 4753 | |
| 4754 | /* When building a static executable, use .iplt, .igot.plt and |
| 4755 | .rela.iplt sections for STT_GNU_IFUNC symbols. */ |
| 4756 | if (htab->elf.splt != NULL) |
| 4757 | { |
| 4758 | plt = htab->elf.splt; |
| 4759 | gotplt = htab->elf.sgotplt; |
| 4760 | relplt = htab->elf.srelplt; |
| 4761 | } |
| 4762 | else |
| 4763 | { |
| 4764 | plt = htab->elf.iplt; |
| 4765 | gotplt = htab->elf.igotplt; |
| 4766 | relplt = htab->elf.irelplt; |
| 4767 | } |
| 4768 | |
| 4769 | /* This symbol has an entry in the procedure linkage table. Set |
| 4770 | it up. */ |
| 4771 | if ((h->dynindx == -1 |
| 4772 | && !((h->forced_local || info->executable) |
| 4773 | && h->def_regular |
| 4774 | && h->type == STT_GNU_IFUNC)) |
| 4775 | || plt == NULL |
| 4776 | || gotplt == NULL |
| 4777 | || relplt == NULL) |
| 4778 | abort (); |
| 4779 | |
| 4780 | /* Get the index in the procedure linkage table which |
| 4781 | corresponds to this symbol. This is the index of this symbol |
| 4782 | in all the symbols for which we are making plt entries. The |
| 4783 | first entry in the procedure linkage table is reserved. |
| 4784 | |
| 4785 | Get the offset into the .got table of the entry that |
| 4786 | corresponds to this function. Each .got entry is GOT_ENTRY_SIZE |
| 4787 | bytes. The first three are reserved for the dynamic linker. |
| 4788 | |
| 4789 | For static executables, we don't reserve anything. */ |
| 4790 | |
| 4791 | if (plt == htab->elf.splt) |
| 4792 | { |
| 4793 | got_offset = h->plt.offset / abed->plt_entry_size - 1; |
| 4794 | got_offset = (got_offset + 3) * GOT_ENTRY_SIZE; |
| 4795 | } |
| 4796 | else |
| 4797 | { |
| 4798 | got_offset = h->plt.offset / abed->plt_entry_size; |
| 4799 | got_offset = got_offset * GOT_ENTRY_SIZE; |
| 4800 | } |
| 4801 | |
| 4802 | plt_plt_insn_end = abed->plt_plt_insn_end; |
| 4803 | plt_plt_offset = abed->plt_plt_offset; |
| 4804 | plt_got_insn_size = abed->plt_got_insn_size; |
| 4805 | plt_got_offset = abed->plt_got_offset; |
| 4806 | if (use_plt_bnd) |
| 4807 | { |
| 4808 | /* Use the second PLT with BND relocations. */ |
| 4809 | const bfd_byte *plt_entry, *plt2_entry; |
| 4810 | struct elf_x86_64_link_hash_entry *eh |
| 4811 | = (struct elf_x86_64_link_hash_entry *) h; |
| 4812 | |
| 4813 | if (eh->has_bnd_reloc) |
| 4814 | { |
| 4815 | plt_entry = elf_x86_64_bnd_plt_entry; |
| 4816 | plt2_entry = elf_x86_64_bnd_plt2_entry; |
| 4817 | } |
| 4818 | else |
| 4819 | { |
| 4820 | plt_entry = elf_x86_64_legacy_plt_entry; |
| 4821 | plt2_entry = elf_x86_64_legacy_plt2_entry; |
| 4822 | |
| 4823 | /* Subtract 1 since there is no BND prefix. */ |
| 4824 | plt_plt_insn_end -= 1; |
| 4825 | plt_plt_offset -= 1; |
| 4826 | plt_got_insn_size -= 1; |
| 4827 | plt_got_offset -= 1; |
| 4828 | } |
| 4829 | |
| 4830 | BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry) |
| 4831 | == sizeof (elf_x86_64_legacy_plt_entry)); |
| 4832 | |
| 4833 | /* Fill in the entry in the procedure linkage table. */ |
| 4834 | memcpy (plt->contents + h->plt.offset, |
| 4835 | plt_entry, sizeof (elf_x86_64_legacy_plt_entry)); |
| 4836 | /* Fill in the entry in the second PLT. */ |
| 4837 | memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset, |
| 4838 | plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry)); |
| 4839 | |
| 4840 | resolved_plt = htab->plt_bnd; |
| 4841 | plt_offset = eh->plt_bnd.offset; |
| 4842 | } |
| 4843 | else |
| 4844 | { |
| 4845 | /* Fill in the entry in the procedure linkage table. */ |
| 4846 | memcpy (plt->contents + h->plt.offset, abed->plt_entry, |
| 4847 | abed->plt_entry_size); |
| 4848 | |
| 4849 | resolved_plt = plt; |
| 4850 | plt_offset = h->plt.offset; |
| 4851 | } |
| 4852 | |
| 4853 | /* Insert the relocation positions of the plt section. */ |
| 4854 | |
| 4855 | /* Put offset the PC-relative instruction referring to the GOT entry, |
| 4856 | subtracting the size of that instruction. */ |
| 4857 | bfd_put_32 (output_bfd, |
| 4858 | (gotplt->output_section->vma |
| 4859 | + gotplt->output_offset |
| 4860 | + got_offset |
| 4861 | - resolved_plt->output_section->vma |
| 4862 | - resolved_plt->output_offset |
| 4863 | - plt_offset |
| 4864 | - plt_got_insn_size), |
| 4865 | resolved_plt->contents + plt_offset + plt_got_offset); |
| 4866 | |
| 4867 | /* Fill in the entry in the global offset table, initially this |
| 4868 | points to the second part of the PLT entry. */ |
| 4869 | bfd_put_64 (output_bfd, (plt->output_section->vma |
| 4870 | + plt->output_offset |
| 4871 | + h->plt.offset + abed->plt_lazy_offset), |
| 4872 | gotplt->contents + got_offset); |
| 4873 | |
| 4874 | /* Fill in the entry in the .rela.plt section. */ |
| 4875 | rela.r_offset = (gotplt->output_section->vma |
| 4876 | + gotplt->output_offset |
| 4877 | + got_offset); |
| 4878 | if (h->dynindx == -1 |
| 4879 | || ((info->executable |
| 4880 | || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 4881 | && h->def_regular |
| 4882 | && h->type == STT_GNU_IFUNC)) |
| 4883 | { |
| 4884 | /* If an STT_GNU_IFUNC symbol is locally defined, generate |
| 4885 | R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */ |
| 4886 | rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE); |
| 4887 | rela.r_addend = (h->root.u.def.value |
| 4888 | + h->root.u.def.section->output_section->vma |
| 4889 | + h->root.u.def.section->output_offset); |
| 4890 | /* R_X86_64_IRELATIVE comes last. */ |
| 4891 | plt_index = htab->next_irelative_index--; |
| 4892 | } |
| 4893 | else |
| 4894 | { |
| 4895 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT); |
| 4896 | rela.r_addend = 0; |
| 4897 | plt_index = htab->next_jump_slot_index++; |
| 4898 | } |
| 4899 | |
| 4900 | /* Don't fill PLT entry for static executables. */ |
| 4901 | if (plt == htab->elf.splt) |
| 4902 | { |
| 4903 | /* Put relocation index. */ |
| 4904 | bfd_put_32 (output_bfd, plt_index, |
| 4905 | plt->contents + h->plt.offset + abed->plt_reloc_offset); |
| 4906 | /* Put offset for jmp .PLT0. */ |
| 4907 | bfd_put_32 (output_bfd, - (h->plt.offset + plt_plt_insn_end), |
| 4908 | plt->contents + h->plt.offset + plt_plt_offset); |
| 4909 | } |
| 4910 | |
| 4911 | bed = get_elf_backend_data (output_bfd); |
| 4912 | loc = relplt->contents + plt_index * bed->s->sizeof_rela; |
| 4913 | bed->s->swap_reloca_out (output_bfd, &rela, loc); |
| 4914 | |
| 4915 | if (!h->def_regular) |
| 4916 | { |
| 4917 | /* Mark the symbol as undefined, rather than as defined in |
| 4918 | the .plt section. Leave the value if there were any |
| 4919 | relocations where pointer equality matters (this is a clue |
| 4920 | for the dynamic linker, to make function pointer |
| 4921 | comparisons work between an application and shared |
| 4922 | library), otherwise set it to zero. If a function is only |
| 4923 | called from a binary, there is no need to slow down |
| 4924 | shared libraries because of that. */ |
| 4925 | sym->st_shndx = SHN_UNDEF; |
| 4926 | if (!h->pointer_equality_needed) |
| 4927 | sym->st_value = 0; |
| 4928 | } |
| 4929 | } |
| 4930 | |
| 4931 | if (h->got.offset != (bfd_vma) -1 |
| 4932 | && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type) |
| 4933 | && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE) |
| 4934 | { |
| 4935 | Elf_Internal_Rela rela; |
| 4936 | |
| 4937 | /* This symbol has an entry in the global offset table. Set it |
| 4938 | up. */ |
| 4939 | if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) |
| 4940 | abort (); |
| 4941 | |
| 4942 | rela.r_offset = (htab->elf.sgot->output_section->vma |
| 4943 | + htab->elf.sgot->output_offset |
| 4944 | + (h->got.offset &~ (bfd_vma) 1)); |
| 4945 | |
| 4946 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 4947 | symbol is defined locally or was forced to be local because |
| 4948 | of a version file, we just want to emit a RELATIVE reloc. |
| 4949 | The entry in the global offset table will already have been |
| 4950 | initialized in the relocate_section function. */ |
| 4951 | if (h->def_regular |
| 4952 | && h->type == STT_GNU_IFUNC) |
| 4953 | { |
| 4954 | if (info->shared) |
| 4955 | { |
| 4956 | /* Generate R_X86_64_GLOB_DAT. */ |
| 4957 | goto do_glob_dat; |
| 4958 | } |
| 4959 | else |
| 4960 | { |
| 4961 | asection *plt; |
| 4962 | |
| 4963 | if (!h->pointer_equality_needed) |
| 4964 | abort (); |
| 4965 | |
| 4966 | /* For non-shared object, we can't use .got.plt, which |
| 4967 | contains the real function addres if we need pointer |
| 4968 | equality. We load the GOT entry with the PLT entry. */ |
| 4969 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; |
| 4970 | bfd_put_64 (output_bfd, (plt->output_section->vma |
| 4971 | + plt->output_offset |
| 4972 | + h->plt.offset), |
| 4973 | htab->elf.sgot->contents + h->got.offset); |
| 4974 | return TRUE; |
| 4975 | } |
| 4976 | } |
| 4977 | else if (info->shared |
| 4978 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 4979 | { |
| 4980 | if (!h->def_regular) |
| 4981 | return FALSE; |
| 4982 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 4983 | rela.r_info = htab->r_info (0, R_X86_64_RELATIVE); |
| 4984 | rela.r_addend = (h->root.u.def.value |
| 4985 | + h->root.u.def.section->output_section->vma |
| 4986 | + h->root.u.def.section->output_offset); |
| 4987 | } |
| 4988 | else |
| 4989 | { |
| 4990 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 4991 | do_glob_dat: |
| 4992 | bfd_put_64 (output_bfd, (bfd_vma) 0, |
| 4993 | htab->elf.sgot->contents + h->got.offset); |
| 4994 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT); |
| 4995 | rela.r_addend = 0; |
| 4996 | } |
| 4997 | |
| 4998 | elf_append_rela (output_bfd, htab->elf.srelgot, &rela); |
| 4999 | } |
| 5000 | |
| 5001 | if (h->needs_copy) |
| 5002 | { |
| 5003 | Elf_Internal_Rela rela; |
| 5004 | |
| 5005 | /* This symbol needs a copy reloc. Set it up. */ |
| 5006 | |
| 5007 | if (h->dynindx == -1 |
| 5008 | || (h->root.type != bfd_link_hash_defined |
| 5009 | && h->root.type != bfd_link_hash_defweak) |
| 5010 | || htab->srelbss == NULL) |
| 5011 | abort (); |
| 5012 | |
| 5013 | rela.r_offset = (h->root.u.def.value |
| 5014 | + h->root.u.def.section->output_section->vma |
| 5015 | + h->root.u.def.section->output_offset); |
| 5016 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY); |
| 5017 | rela.r_addend = 0; |
| 5018 | elf_append_rela (output_bfd, htab->srelbss, &rela); |
| 5019 | } |
| 5020 | |
| 5021 | return TRUE; |
| 5022 | } |
| 5023 | |
| 5024 | /* Finish up local dynamic symbol handling. We set the contents of |
| 5025 | various dynamic sections here. */ |
| 5026 | |
| 5027 | static bfd_boolean |
| 5028 | elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf) |
| 5029 | { |
| 5030 | struct elf_link_hash_entry *h |
| 5031 | = (struct elf_link_hash_entry *) *slot; |
| 5032 | struct bfd_link_info *info |
| 5033 | = (struct bfd_link_info *) inf; |
| 5034 | |
| 5035 | return elf_x86_64_finish_dynamic_symbol (info->output_bfd, |
| 5036 | info, h, NULL); |
| 5037 | } |
| 5038 | |
| 5039 | /* Used to decide how to sort relocs in an optimal manner for the |
| 5040 | dynamic linker, before writing them out. */ |
| 5041 | |
| 5042 | static enum elf_reloc_type_class |
| 5043 | elf_x86_64_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 5044 | const asection *rel_sec ATTRIBUTE_UNUSED, |
| 5045 | const Elf_Internal_Rela *rela) |
| 5046 | { |
| 5047 | switch ((int) ELF32_R_TYPE (rela->r_info)) |
| 5048 | { |
| 5049 | case R_X86_64_RELATIVE: |
| 5050 | case R_X86_64_RELATIVE64: |
| 5051 | return reloc_class_relative; |
| 5052 | case R_X86_64_JUMP_SLOT: |
| 5053 | return reloc_class_plt; |
| 5054 | case R_X86_64_COPY: |
| 5055 | return reloc_class_copy; |
| 5056 | default: |
| 5057 | return reloc_class_normal; |
| 5058 | } |
| 5059 | } |
| 5060 | |
| 5061 | /* Finish up the dynamic sections. */ |
| 5062 | |
| 5063 | static bfd_boolean |
| 5064 | elf_x86_64_finish_dynamic_sections (bfd *output_bfd, |
| 5065 | struct bfd_link_info *info) |
| 5066 | { |
| 5067 | struct elf_x86_64_link_hash_table *htab; |
| 5068 | bfd *dynobj; |
| 5069 | asection *sdyn; |
| 5070 | const struct elf_x86_64_backend_data *abed; |
| 5071 | |
| 5072 | htab = elf_x86_64_hash_table (info); |
| 5073 | if (htab == NULL) |
| 5074 | return FALSE; |
| 5075 | |
| 5076 | /* Use MPX backend data in case of BND relocation. Use .plt_bnd |
| 5077 | section only if there is .plt section. */ |
| 5078 | abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL |
| 5079 | ? &elf_x86_64_bnd_arch_bed |
| 5080 | : get_elf_x86_64_backend_data (output_bfd)); |
| 5081 | |
| 5082 | dynobj = htab->elf.dynobj; |
| 5083 | sdyn = bfd_get_linker_section (dynobj, ".dynamic"); |
| 5084 | |
| 5085 | if (htab->elf.dynamic_sections_created) |
| 5086 | { |
| 5087 | bfd_byte *dyncon, *dynconend; |
| 5088 | const struct elf_backend_data *bed; |
| 5089 | bfd_size_type sizeof_dyn; |
| 5090 | |
| 5091 | if (sdyn == NULL || htab->elf.sgot == NULL) |
| 5092 | abort (); |
| 5093 | |
| 5094 | bed = get_elf_backend_data (dynobj); |
| 5095 | sizeof_dyn = bed->s->sizeof_dyn; |
| 5096 | dyncon = sdyn->contents; |
| 5097 | dynconend = sdyn->contents + sdyn->size; |
| 5098 | for (; dyncon < dynconend; dyncon += sizeof_dyn) |
| 5099 | { |
| 5100 | Elf_Internal_Dyn dyn; |
| 5101 | asection *s; |
| 5102 | |
| 5103 | (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn); |
| 5104 | |
| 5105 | switch (dyn.d_tag) |
| 5106 | { |
| 5107 | default: |
| 5108 | continue; |
| 5109 | |
| 5110 | case DT_PLTGOT: |
| 5111 | s = htab->elf.sgotplt; |
| 5112 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 5113 | break; |
| 5114 | |
| 5115 | case DT_JMPREL: |
| 5116 | dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma; |
| 5117 | break; |
| 5118 | |
| 5119 | case DT_PLTRELSZ: |
| 5120 | s = htab->elf.srelplt->output_section; |
| 5121 | dyn.d_un.d_val = s->size; |
| 5122 | break; |
| 5123 | |
| 5124 | case DT_RELASZ: |
| 5125 | /* The procedure linkage table relocs (DT_JMPREL) should |
| 5126 | not be included in the overall relocs (DT_RELA). |
| 5127 | Therefore, we override the DT_RELASZ entry here to |
| 5128 | make it not include the JMPREL relocs. Since the |
| 5129 | linker script arranges for .rela.plt to follow all |
| 5130 | other relocation sections, we don't have to worry |
| 5131 | about changing the DT_RELA entry. */ |
| 5132 | if (htab->elf.srelplt != NULL) |
| 5133 | { |
| 5134 | s = htab->elf.srelplt->output_section; |
| 5135 | dyn.d_un.d_val -= s->size; |
| 5136 | } |
| 5137 | break; |
| 5138 | |
| 5139 | case DT_TLSDESC_PLT: |
| 5140 | s = htab->elf.splt; |
| 5141 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset |
| 5142 | + htab->tlsdesc_plt; |
| 5143 | break; |
| 5144 | |
| 5145 | case DT_TLSDESC_GOT: |
| 5146 | s = htab->elf.sgot; |
| 5147 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset |
| 5148 | + htab->tlsdesc_got; |
| 5149 | break; |
| 5150 | } |
| 5151 | |
| 5152 | (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon); |
| 5153 | } |
| 5154 | |
| 5155 | /* Fill in the special first entry in the procedure linkage table. */ |
| 5156 | if (htab->elf.splt && htab->elf.splt->size > 0) |
| 5157 | { |
| 5158 | /* Fill in the first entry in the procedure linkage table. */ |
| 5159 | memcpy (htab->elf.splt->contents, |
| 5160 | abed->plt0_entry, abed->plt_entry_size); |
| 5161 | /* Add offset for pushq GOT+8(%rip), since the instruction |
| 5162 | uses 6 bytes subtract this value. */ |
| 5163 | bfd_put_32 (output_bfd, |
| 5164 | (htab->elf.sgotplt->output_section->vma |
| 5165 | + htab->elf.sgotplt->output_offset |
| 5166 | + 8 |
| 5167 | - htab->elf.splt->output_section->vma |
| 5168 | - htab->elf.splt->output_offset |
| 5169 | - 6), |
| 5170 | htab->elf.splt->contents + abed->plt0_got1_offset); |
| 5171 | /* Add offset for the PC-relative instruction accessing GOT+16, |
| 5172 | subtracting the offset to the end of that instruction. */ |
| 5173 | bfd_put_32 (output_bfd, |
| 5174 | (htab->elf.sgotplt->output_section->vma |
| 5175 | + htab->elf.sgotplt->output_offset |
| 5176 | + 16 |
| 5177 | - htab->elf.splt->output_section->vma |
| 5178 | - htab->elf.splt->output_offset |
| 5179 | - abed->plt0_got2_insn_end), |
| 5180 | htab->elf.splt->contents + abed->plt0_got2_offset); |
| 5181 | |
| 5182 | elf_section_data (htab->elf.splt->output_section) |
| 5183 | ->this_hdr.sh_entsize = abed->plt_entry_size; |
| 5184 | |
| 5185 | if (htab->tlsdesc_plt) |
| 5186 | { |
| 5187 | bfd_put_64 (output_bfd, (bfd_vma) 0, |
| 5188 | htab->elf.sgot->contents + htab->tlsdesc_got); |
| 5189 | |
| 5190 | memcpy (htab->elf.splt->contents + htab->tlsdesc_plt, |
| 5191 | abed->plt0_entry, abed->plt_entry_size); |
| 5192 | |
| 5193 | /* Add offset for pushq GOT+8(%rip), since the |
| 5194 | instruction uses 6 bytes subtract this value. */ |
| 5195 | bfd_put_32 (output_bfd, |
| 5196 | (htab->elf.sgotplt->output_section->vma |
| 5197 | + htab->elf.sgotplt->output_offset |
| 5198 | + 8 |
| 5199 | - htab->elf.splt->output_section->vma |
| 5200 | - htab->elf.splt->output_offset |
| 5201 | - htab->tlsdesc_plt |
| 5202 | - 6), |
| 5203 | htab->elf.splt->contents |
| 5204 | + htab->tlsdesc_plt + abed->plt0_got1_offset); |
| 5205 | /* Add offset for the PC-relative instruction accessing GOT+TDG, |
| 5206 | where TGD stands for htab->tlsdesc_got, subtracting the offset |
| 5207 | to the end of that instruction. */ |
| 5208 | bfd_put_32 (output_bfd, |
| 5209 | (htab->elf.sgot->output_section->vma |
| 5210 | + htab->elf.sgot->output_offset |
| 5211 | + htab->tlsdesc_got |
| 5212 | - htab->elf.splt->output_section->vma |
| 5213 | - htab->elf.splt->output_offset |
| 5214 | - htab->tlsdesc_plt |
| 5215 | - abed->plt0_got2_insn_end), |
| 5216 | htab->elf.splt->contents |
| 5217 | + htab->tlsdesc_plt + abed->plt0_got2_offset); |
| 5218 | } |
| 5219 | } |
| 5220 | } |
| 5221 | |
| 5222 | if (htab->plt_bnd != NULL) |
| 5223 | elf_section_data (htab->plt_bnd->output_section) |
| 5224 | ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry); |
| 5225 | |
| 5226 | if (htab->elf.sgotplt) |
| 5227 | { |
| 5228 | if (bfd_is_abs_section (htab->elf.sgotplt->output_section)) |
| 5229 | { |
| 5230 | (*_bfd_error_handler) |
| 5231 | (_("discarded output section: `%A'"), htab->elf.sgotplt); |
| 5232 | return FALSE; |
| 5233 | } |
| 5234 | |
| 5235 | /* Fill in the first three entries in the global offset table. */ |
| 5236 | if (htab->elf.sgotplt->size > 0) |
| 5237 | { |
| 5238 | /* Set the first entry in the global offset table to the address of |
| 5239 | the dynamic section. */ |
| 5240 | if (sdyn == NULL) |
| 5241 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents); |
| 5242 | else |
| 5243 | bfd_put_64 (output_bfd, |
| 5244 | sdyn->output_section->vma + sdyn->output_offset, |
| 5245 | htab->elf.sgotplt->contents); |
| 5246 | /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ |
| 5247 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE); |
| 5248 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2); |
| 5249 | } |
| 5250 | |
| 5251 | elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = |
| 5252 | GOT_ENTRY_SIZE; |
| 5253 | } |
| 5254 | |
| 5255 | /* Adjust .eh_frame for .plt section. */ |
| 5256 | if (htab->plt_eh_frame != NULL |
| 5257 | && htab->plt_eh_frame->contents != NULL) |
| 5258 | { |
| 5259 | if (htab->elf.splt != NULL |
| 5260 | && htab->elf.splt->size != 0 |
| 5261 | && (htab->elf.splt->flags & SEC_EXCLUDE) == 0 |
| 5262 | && htab->elf.splt->output_section != NULL |
| 5263 | && htab->plt_eh_frame->output_section != NULL) |
| 5264 | { |
| 5265 | bfd_vma plt_start = htab->elf.splt->output_section->vma; |
| 5266 | bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma |
| 5267 | + htab->plt_eh_frame->output_offset |
| 5268 | + PLT_FDE_START_OFFSET; |
| 5269 | bfd_put_signed_32 (dynobj, plt_start - eh_frame_start, |
| 5270 | htab->plt_eh_frame->contents |
| 5271 | + PLT_FDE_START_OFFSET); |
| 5272 | } |
| 5273 | if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME) |
| 5274 | { |
| 5275 | if (! _bfd_elf_write_section_eh_frame (output_bfd, info, |
| 5276 | htab->plt_eh_frame, |
| 5277 | htab->plt_eh_frame->contents)) |
| 5278 | return FALSE; |
| 5279 | } |
| 5280 | } |
| 5281 | |
| 5282 | if (htab->elf.sgot && htab->elf.sgot->size > 0) |
| 5283 | elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize |
| 5284 | = GOT_ENTRY_SIZE; |
| 5285 | |
| 5286 | /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ |
| 5287 | htab_traverse (htab->loc_hash_table, |
| 5288 | elf_x86_64_finish_local_dynamic_symbol, |
| 5289 | info); |
| 5290 | |
| 5291 | return TRUE; |
| 5292 | } |
| 5293 | |
| 5294 | /* Return address for Ith PLT stub in section PLT, for relocation REL |
| 5295 | or (bfd_vma) -1 if it should not be included. */ |
| 5296 | |
| 5297 | static bfd_vma |
| 5298 | elf_x86_64_plt_sym_val (bfd_vma i, const asection *plt, |
| 5299 | const arelent *rel ATTRIBUTE_UNUSED) |
| 5300 | { |
| 5301 | return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner); |
| 5302 | } |
| 5303 | |
| 5304 | /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section |
| 5305 | support. */ |
| 5306 | |
| 5307 | static long |
| 5308 | elf_x86_64_get_synthetic_symtab (bfd *abfd, |
| 5309 | long symcount, |
| 5310 | asymbol **syms, |
| 5311 | long dynsymcount, |
| 5312 | asymbol **dynsyms, |
| 5313 | asymbol **ret) |
| 5314 | { |
| 5315 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
| 5316 | asection *relplt; |
| 5317 | asymbol *s; |
| 5318 | bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean); |
| 5319 | arelent *p; |
| 5320 | long count, i, n; |
| 5321 | size_t size; |
| 5322 | Elf_Internal_Shdr *hdr; |
| 5323 | char *names; |
| 5324 | asection *plt; |
| 5325 | bfd_vma addr; |
| 5326 | |
| 5327 | plt = bfd_get_section_by_name (abfd, ".plt.bnd"); |
| 5328 | /* Use the generic ELF version if there is no .plt.bnd section. */ |
| 5329 | if (plt == NULL) |
| 5330 | return _bfd_elf_get_synthetic_symtab (abfd, symcount, syms, |
| 5331 | dynsymcount, dynsyms, ret); |
| 5332 | |
| 5333 | *ret = NULL; |
| 5334 | |
| 5335 | if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0) |
| 5336 | return 0; |
| 5337 | |
| 5338 | if (dynsymcount <= 0) |
| 5339 | return 0; |
| 5340 | |
| 5341 | relplt = bfd_get_section_by_name (abfd, ".rela.plt"); |
| 5342 | if (relplt == NULL) |
| 5343 | return 0; |
| 5344 | |
| 5345 | hdr = &elf_section_data (relplt)->this_hdr; |
| 5346 | if (hdr->sh_link != elf_dynsymtab (abfd) |
| 5347 | || (hdr->sh_type != SHT_REL && hdr->sh_type != SHT_RELA)) |
| 5348 | return 0; |
| 5349 | |
| 5350 | slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table; |
| 5351 | if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE)) |
| 5352 | return -1; |
| 5353 | |
| 5354 | count = relplt->size / hdr->sh_entsize; |
| 5355 | size = count * sizeof (asymbol); |
| 5356 | p = relplt->relocation; |
| 5357 | for (i = 0; i < count; i++, p += bed->s->int_rels_per_ext_rel) |
| 5358 | { |
| 5359 | size += strlen ((*p->sym_ptr_ptr)->name) + sizeof ("@plt"); |
| 5360 | if (p->addend != 0) |
| 5361 | size += sizeof ("+0x") - 1 + 8 + 8; |
| 5362 | } |
| 5363 | |
| 5364 | s = *ret = (asymbol *) bfd_malloc (size); |
| 5365 | if (s == NULL) |
| 5366 | return -1; |
| 5367 | |
| 5368 | names = (char *) (s + count); |
| 5369 | p = relplt->relocation; |
| 5370 | n = 0; |
| 5371 | addr = 0; |
| 5372 | for (i = 0; i < count; i++, p++) |
| 5373 | { |
| 5374 | size_t len; |
| 5375 | |
| 5376 | *s = **p->sym_ptr_ptr; |
| 5377 | /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL set. Since |
| 5378 | we are defining a symbol, ensure one of them is set. */ |
| 5379 | if ((s->flags & BSF_LOCAL) == 0) |
| 5380 | s->flags |= BSF_GLOBAL; |
| 5381 | s->flags |= BSF_SYNTHETIC; |
| 5382 | s->section = plt; |
| 5383 | s->value = addr; |
| 5384 | s->name = names; |
| 5385 | s->udata.p = NULL; |
| 5386 | len = strlen ((*p->sym_ptr_ptr)->name); |
| 5387 | memcpy (names, (*p->sym_ptr_ptr)->name, len); |
| 5388 | names += len; |
| 5389 | if (p->addend != 0) |
| 5390 | { |
| 5391 | char buf[30], *a; |
| 5392 | |
| 5393 | memcpy (names, "+0x", sizeof ("+0x") - 1); |
| 5394 | names += sizeof ("+0x") - 1; |
| 5395 | bfd_sprintf_vma (abfd, buf, p->addend); |
| 5396 | for (a = buf; *a == '0'; ++a) |
| 5397 | ; |
| 5398 | len = strlen (a); |
| 5399 | memcpy (names, a, len); |
| 5400 | names += len; |
| 5401 | } |
| 5402 | memcpy (names, "@plt", sizeof ("@plt")); |
| 5403 | names += sizeof ("@plt"); |
| 5404 | ++s, ++n; |
| 5405 | addr += sizeof (elf_x86_64_legacy_plt2_entry); |
| 5406 | } |
| 5407 | |
| 5408 | return n; |
| 5409 | } |
| 5410 | |
| 5411 | /* Handle an x86-64 specific section when reading an object file. This |
| 5412 | is called when elfcode.h finds a section with an unknown type. */ |
| 5413 | |
| 5414 | static bfd_boolean |
| 5415 | elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr, |
| 5416 | const char *name, int shindex) |
| 5417 | { |
| 5418 | if (hdr->sh_type != SHT_X86_64_UNWIND) |
| 5419 | return FALSE; |
| 5420 | |
| 5421 | if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) |
| 5422 | return FALSE; |
| 5423 | |
| 5424 | return TRUE; |
| 5425 | } |
| 5426 | |
| 5427 | /* Hook called by the linker routine which adds symbols from an object |
| 5428 | file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead |
| 5429 | of .bss. */ |
| 5430 | |
| 5431 | static bfd_boolean |
| 5432 | elf_x86_64_add_symbol_hook (bfd *abfd, |
| 5433 | struct bfd_link_info *info, |
| 5434 | Elf_Internal_Sym *sym, |
| 5435 | const char **namep ATTRIBUTE_UNUSED, |
| 5436 | flagword *flagsp ATTRIBUTE_UNUSED, |
| 5437 | asection **secp, |
| 5438 | bfd_vma *valp) |
| 5439 | { |
| 5440 | asection *lcomm; |
| 5441 | |
| 5442 | switch (sym->st_shndx) |
| 5443 | { |
| 5444 | case SHN_X86_64_LCOMMON: |
| 5445 | lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON"); |
| 5446 | if (lcomm == NULL) |
| 5447 | { |
| 5448 | lcomm = bfd_make_section_with_flags (abfd, |
| 5449 | "LARGE_COMMON", |
| 5450 | (SEC_ALLOC |
| 5451 | | SEC_IS_COMMON |
| 5452 | | SEC_LINKER_CREATED)); |
| 5453 | if (lcomm == NULL) |
| 5454 | return FALSE; |
| 5455 | elf_section_flags (lcomm) |= SHF_X86_64_LARGE; |
| 5456 | } |
| 5457 | *secp = lcomm; |
| 5458 | *valp = sym->st_size; |
| 5459 | return TRUE; |
| 5460 | } |
| 5461 | |
| 5462 | if ((abfd->flags & DYNAMIC) == 0 |
| 5463 | && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC |
| 5464 | || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)) |
| 5465 | elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE; |
| 5466 | |
| 5467 | return TRUE; |
| 5468 | } |
| 5469 | |
| 5470 | |
| 5471 | /* Given a BFD section, try to locate the corresponding ELF section |
| 5472 | index. */ |
| 5473 | |
| 5474 | static bfd_boolean |
| 5475 | elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, |
| 5476 | asection *sec, int *index_return) |
| 5477 | { |
| 5478 | if (sec == &_bfd_elf_large_com_section) |
| 5479 | { |
| 5480 | *index_return = SHN_X86_64_LCOMMON; |
| 5481 | return TRUE; |
| 5482 | } |
| 5483 | return FALSE; |
| 5484 | } |
| 5485 | |
| 5486 | /* Process a symbol. */ |
| 5487 | |
| 5488 | static void |
| 5489 | elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, |
| 5490 | asymbol *asym) |
| 5491 | { |
| 5492 | elf_symbol_type *elfsym = (elf_symbol_type *) asym; |
| 5493 | |
| 5494 | switch (elfsym->internal_elf_sym.st_shndx) |
| 5495 | { |
| 5496 | case SHN_X86_64_LCOMMON: |
| 5497 | asym->section = &_bfd_elf_large_com_section; |
| 5498 | asym->value = elfsym->internal_elf_sym.st_size; |
| 5499 | /* Common symbol doesn't set BSF_GLOBAL. */ |
| 5500 | asym->flags &= ~BSF_GLOBAL; |
| 5501 | break; |
| 5502 | } |
| 5503 | } |
| 5504 | |
| 5505 | static bfd_boolean |
| 5506 | elf_x86_64_common_definition (Elf_Internal_Sym *sym) |
| 5507 | { |
| 5508 | return (sym->st_shndx == SHN_COMMON |
| 5509 | || sym->st_shndx == SHN_X86_64_LCOMMON); |
| 5510 | } |
| 5511 | |
| 5512 | static unsigned int |
| 5513 | elf_x86_64_common_section_index (asection *sec) |
| 5514 | { |
| 5515 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) |
| 5516 | return SHN_COMMON; |
| 5517 | else |
| 5518 | return SHN_X86_64_LCOMMON; |
| 5519 | } |
| 5520 | |
| 5521 | static asection * |
| 5522 | elf_x86_64_common_section (asection *sec) |
| 5523 | { |
| 5524 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) |
| 5525 | return bfd_com_section_ptr; |
| 5526 | else |
| 5527 | return &_bfd_elf_large_com_section; |
| 5528 | } |
| 5529 | |
| 5530 | static bfd_boolean |
| 5531 | elf_x86_64_merge_symbol (struct elf_link_hash_entry *h, |
| 5532 | const Elf_Internal_Sym *sym, |
| 5533 | asection **psec, |
| 5534 | bfd_boolean newdef, |
| 5535 | bfd_boolean olddef, |
| 5536 | bfd *oldbfd, |
| 5537 | const asection *oldsec) |
| 5538 | { |
| 5539 | /* A normal common symbol and a large common symbol result in a |
| 5540 | normal common symbol. We turn the large common symbol into a |
| 5541 | normal one. */ |
| 5542 | if (!olddef |
| 5543 | && h->root.type == bfd_link_hash_common |
| 5544 | && !newdef |
| 5545 | && bfd_is_com_section (*psec) |
| 5546 | && oldsec != *psec) |
| 5547 | { |
| 5548 | if (sym->st_shndx == SHN_COMMON |
| 5549 | && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0) |
| 5550 | { |
| 5551 | h->root.u.c.p->section |
| 5552 | = bfd_make_section_old_way (oldbfd, "COMMON"); |
| 5553 | h->root.u.c.p->section->flags = SEC_ALLOC; |
| 5554 | } |
| 5555 | else if (sym->st_shndx == SHN_X86_64_LCOMMON |
| 5556 | && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0) |
| 5557 | *psec = bfd_com_section_ptr; |
| 5558 | } |
| 5559 | |
| 5560 | return TRUE; |
| 5561 | } |
| 5562 | |
| 5563 | static int |
| 5564 | elf_x86_64_additional_program_headers (bfd *abfd, |
| 5565 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 5566 | { |
| 5567 | asection *s; |
| 5568 | int count = 0; |
| 5569 | |
| 5570 | /* Check to see if we need a large readonly segment. */ |
| 5571 | s = bfd_get_section_by_name (abfd, ".lrodata"); |
| 5572 | if (s && (s->flags & SEC_LOAD)) |
| 5573 | count++; |
| 5574 | |
| 5575 | /* Check to see if we need a large data segment. Since .lbss sections |
| 5576 | is placed right after the .bss section, there should be no need for |
| 5577 | a large data segment just because of .lbss. */ |
| 5578 | s = bfd_get_section_by_name (abfd, ".ldata"); |
| 5579 | if (s && (s->flags & SEC_LOAD)) |
| 5580 | count++; |
| 5581 | |
| 5582 | return count; |
| 5583 | } |
| 5584 | |
| 5585 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ |
| 5586 | |
| 5587 | static bfd_boolean |
| 5588 | elf_x86_64_hash_symbol (struct elf_link_hash_entry *h) |
| 5589 | { |
| 5590 | if (h->plt.offset != (bfd_vma) -1 |
| 5591 | && !h->def_regular |
| 5592 | && !h->pointer_equality_needed) |
| 5593 | return FALSE; |
| 5594 | |
| 5595 | return _bfd_elf_hash_symbol (h); |
| 5596 | } |
| 5597 | |
| 5598 | /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */ |
| 5599 | |
| 5600 | static bfd_boolean |
| 5601 | elf_x86_64_relocs_compatible (const bfd_target *input, |
| 5602 | const bfd_target *output) |
| 5603 | { |
| 5604 | return ((xvec_get_elf_backend_data (input)->s->elfclass |
| 5605 | == xvec_get_elf_backend_data (output)->s->elfclass) |
| 5606 | && _bfd_elf_relocs_compatible (input, output)); |
| 5607 | } |
| 5608 | |
| 5609 | static const struct bfd_elf_special_section |
| 5610 | elf_x86_64_special_sections[]= |
| 5611 | { |
| 5612 | { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 5613 | { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, |
| 5614 | { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE}, |
| 5615 | { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 5616 | { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 5617 | { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, |
| 5618 | { NULL, 0, 0, 0, 0 } |
| 5619 | }; |
| 5620 | |
| 5621 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec |
| 5622 | #define TARGET_LITTLE_NAME "elf64-x86-64" |
| 5623 | #define ELF_ARCH bfd_arch_i386 |
| 5624 | #define ELF_TARGET_ID X86_64_ELF_DATA |
| 5625 | #define ELF_MACHINE_CODE EM_X86_64 |
| 5626 | #define ELF_MAXPAGESIZE 0x200000 |
| 5627 | #define ELF_MINPAGESIZE 0x1000 |
| 5628 | #define ELF_COMMONPAGESIZE 0x1000 |
| 5629 | |
| 5630 | #define elf_backend_can_gc_sections 1 |
| 5631 | #define elf_backend_can_refcount 1 |
| 5632 | #define elf_backend_want_got_plt 1 |
| 5633 | #define elf_backend_plt_readonly 1 |
| 5634 | #define elf_backend_want_plt_sym 0 |
| 5635 | #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) |
| 5636 | #define elf_backend_rela_normal 1 |
| 5637 | #define elf_backend_plt_alignment 4 |
| 5638 | |
| 5639 | #define elf_info_to_howto elf_x86_64_info_to_howto |
| 5640 | |
| 5641 | #define bfd_elf64_bfd_link_hash_table_create \ |
| 5642 | elf_x86_64_link_hash_table_create |
| 5643 | #define bfd_elf64_bfd_link_hash_table_free \ |
| 5644 | elf_x86_64_link_hash_table_free |
| 5645 | #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup |
| 5646 | #define bfd_elf64_bfd_reloc_name_lookup \ |
| 5647 | elf_x86_64_reloc_name_lookup |
| 5648 | |
| 5649 | #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol |
| 5650 | #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible |
| 5651 | #define elf_backend_check_relocs elf_x86_64_check_relocs |
| 5652 | #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol |
| 5653 | #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections |
| 5654 | #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections |
| 5655 | #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol |
| 5656 | #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook |
| 5657 | #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook |
| 5658 | #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus |
| 5659 | #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo |
| 5660 | #ifdef CORE_HEADER |
| 5661 | #define elf_backend_write_core_note elf_x86_64_write_core_note |
| 5662 | #endif |
| 5663 | #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class |
| 5664 | #define elf_backend_relocate_section elf_x86_64_relocate_section |
| 5665 | #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections |
| 5666 | #define elf_backend_always_size_sections elf_x86_64_always_size_sections |
| 5667 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section |
| 5668 | #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val |
| 5669 | #define elf_backend_object_p elf64_x86_64_elf_object_p |
| 5670 | #define bfd_elf64_mkobject elf_x86_64_mkobject |
| 5671 | #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab |
| 5672 | |
| 5673 | #define elf_backend_section_from_shdr \ |
| 5674 | elf_x86_64_section_from_shdr |
| 5675 | |
| 5676 | #define elf_backend_section_from_bfd_section \ |
| 5677 | elf_x86_64_elf_section_from_bfd_section |
| 5678 | #define elf_backend_add_symbol_hook \ |
| 5679 | elf_x86_64_add_symbol_hook |
| 5680 | #define elf_backend_symbol_processing \ |
| 5681 | elf_x86_64_symbol_processing |
| 5682 | #define elf_backend_common_section_index \ |
| 5683 | elf_x86_64_common_section_index |
| 5684 | #define elf_backend_common_section \ |
| 5685 | elf_x86_64_common_section |
| 5686 | #define elf_backend_common_definition \ |
| 5687 | elf_x86_64_common_definition |
| 5688 | #define elf_backend_merge_symbol \ |
| 5689 | elf_x86_64_merge_symbol |
| 5690 | #define elf_backend_special_sections \ |
| 5691 | elf_x86_64_special_sections |
| 5692 | #define elf_backend_additional_program_headers \ |
| 5693 | elf_x86_64_additional_program_headers |
| 5694 | #define elf_backend_hash_symbol \ |
| 5695 | elf_x86_64_hash_symbol |
| 5696 | |
| 5697 | #include "elf64-target.h" |
| 5698 | |
| 5699 | /* FreeBSD support. */ |
| 5700 | |
| 5701 | #undef TARGET_LITTLE_SYM |
| 5702 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec |
| 5703 | #undef TARGET_LITTLE_NAME |
| 5704 | #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd" |
| 5705 | |
| 5706 | #undef ELF_OSABI |
| 5707 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 5708 | |
| 5709 | #undef elf64_bed |
| 5710 | #define elf64_bed elf64_x86_64_fbsd_bed |
| 5711 | |
| 5712 | #include "elf64-target.h" |
| 5713 | |
| 5714 | /* Solaris 2 support. */ |
| 5715 | |
| 5716 | #undef TARGET_LITTLE_SYM |
| 5717 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec |
| 5718 | #undef TARGET_LITTLE_NAME |
| 5719 | #define TARGET_LITTLE_NAME "elf64-x86-64-sol2" |
| 5720 | |
| 5721 | /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE |
| 5722 | objects won't be recognized. */ |
| 5723 | #undef ELF_OSABI |
| 5724 | |
| 5725 | #undef elf64_bed |
| 5726 | #define elf64_bed elf64_x86_64_sol2_bed |
| 5727 | |
| 5728 | /* The 64-bit static TLS arena size is rounded to the nearest 16-byte |
| 5729 | boundary. */ |
| 5730 | #undef elf_backend_static_tls_alignment |
| 5731 | #define elf_backend_static_tls_alignment 16 |
| 5732 | |
| 5733 | /* The Solaris 2 ABI requires a plt symbol on all platforms. |
| 5734 | |
| 5735 | Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output |
| 5736 | File, p.63. */ |
| 5737 | #undef elf_backend_want_plt_sym |
| 5738 | #define elf_backend_want_plt_sym 1 |
| 5739 | |
| 5740 | #include "elf64-target.h" |
| 5741 | |
| 5742 | #undef bfd_elf64_get_synthetic_symtab |
| 5743 | |
| 5744 | /* Native Client support. */ |
| 5745 | |
| 5746 | static bfd_boolean |
| 5747 | elf64_x86_64_nacl_elf_object_p (bfd *abfd) |
| 5748 | { |
| 5749 | /* Set the right machine number for a NaCl x86-64 ELF64 file. */ |
| 5750 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl); |
| 5751 | return TRUE; |
| 5752 | } |
| 5753 | |
| 5754 | #undef TARGET_LITTLE_SYM |
| 5755 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_nacl_vec |
| 5756 | #undef TARGET_LITTLE_NAME |
| 5757 | #define TARGET_LITTLE_NAME "elf64-x86-64-nacl" |
| 5758 | #undef elf64_bed |
| 5759 | #define elf64_bed elf64_x86_64_nacl_bed |
| 5760 | |
| 5761 | #undef ELF_MAXPAGESIZE |
| 5762 | #undef ELF_MINPAGESIZE |
| 5763 | #undef ELF_COMMONPAGESIZE |
| 5764 | #define ELF_MAXPAGESIZE 0x10000 |
| 5765 | #define ELF_MINPAGESIZE 0x10000 |
| 5766 | #define ELF_COMMONPAGESIZE 0x10000 |
| 5767 | |
| 5768 | /* Restore defaults. */ |
| 5769 | #undef ELF_OSABI |
| 5770 | #undef elf_backend_static_tls_alignment |
| 5771 | #undef elf_backend_want_plt_sym |
| 5772 | #define elf_backend_want_plt_sym 0 |
| 5773 | |
| 5774 | /* NaCl uses substantially different PLT entries for the same effects. */ |
| 5775 | |
| 5776 | #undef elf_backend_plt_alignment |
| 5777 | #define elf_backend_plt_alignment 5 |
| 5778 | #define NACL_PLT_ENTRY_SIZE 64 |
| 5779 | #define NACLMASK 0xe0 /* 32-byte alignment mask. */ |
| 5780 | |
| 5781 | static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] = |
| 5782 | { |
| 5783 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
| 5784 | 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */ |
| 5785 | 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */ |
| 5786 | 0x4d, 0x01, 0xfb, /* add %r15, %r11 */ |
| 5787 | 0x41, 0xff, 0xe3, /* jmpq *%r11 */ |
| 5788 | |
| 5789 | /* 9-byte nop sequence to pad out to the next 32-byte boundary. */ |
| 5790 | 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */ |
| 5791 | |
| 5792 | /* 32 bytes of nop to pad out to the standard size. */ |
| 5793 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */ |
| 5794 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ |
| 5795 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */ |
| 5796 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ |
| 5797 | 0x66, /* excess data32 prefix */ |
| 5798 | 0x90 /* nop */ |
| 5799 | }; |
| 5800 | |
| 5801 | static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] = |
| 5802 | { |
| 5803 | 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */ |
| 5804 | 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */ |
| 5805 | 0x4d, 0x01, 0xfb, /* add %r15, %r11 */ |
| 5806 | 0x41, 0xff, 0xe3, /* jmpq *%r11 */ |
| 5807 | |
| 5808 | /* 15-byte nop sequence to pad out to the next 32-byte boundary. */ |
| 5809 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */ |
| 5810 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ |
| 5811 | |
| 5812 | /* Lazy GOT entries point here (32-byte aligned). */ |
| 5813 | 0x68, /* pushq immediate */ |
| 5814 | 0, 0, 0, 0, /* replaced with index into relocation table. */ |
| 5815 | 0xe9, /* jmp relative */ |
| 5816 | 0, 0, 0, 0, /* replaced with offset to start of .plt0. */ |
| 5817 | |
| 5818 | /* 22 bytes of nop to pad out to the standard size. */ |
| 5819 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */ |
| 5820 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */ |
| 5821 | 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */ |
| 5822 | }; |
| 5823 | |
| 5824 | /* .eh_frame covering the .plt section. */ |
| 5825 | |
| 5826 | static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] = |
| 5827 | { |
| 5828 | #if (PLT_CIE_LENGTH != 20 \ |
| 5829 | || PLT_FDE_LENGTH != 36 \ |
| 5830 | || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \ |
| 5831 | || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12) |
| 5832 | # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!" |
| 5833 | #endif |
| 5834 | PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */ |
| 5835 | 0, 0, 0, 0, /* CIE ID */ |
| 5836 | 1, /* CIE version */ |
| 5837 | 'z', 'R', 0, /* Augmentation string */ |
| 5838 | 1, /* Code alignment factor */ |
| 5839 | 0x78, /* Data alignment factor */ |
| 5840 | 16, /* Return address column */ |
| 5841 | 1, /* Augmentation size */ |
| 5842 | DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */ |
| 5843 | DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */ |
| 5844 | DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */ |
| 5845 | DW_CFA_nop, DW_CFA_nop, |
| 5846 | |
| 5847 | PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */ |
| 5848 | PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */ |
| 5849 | 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */ |
| 5850 | 0, 0, 0, 0, /* .plt size goes here */ |
| 5851 | 0, /* Augmentation size */ |
| 5852 | DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */ |
| 5853 | DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */ |
| 5854 | DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */ |
| 5855 | DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */ |
| 5856 | DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */ |
| 5857 | 13, /* Block length */ |
| 5858 | DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */ |
| 5859 | DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */ |
| 5860 | DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge, |
| 5861 | DW_OP_lit3, DW_OP_shl, DW_OP_plus, |
| 5862 | DW_CFA_nop, DW_CFA_nop |
| 5863 | }; |
| 5864 | |
| 5865 | static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed = |
| 5866 | { |
| 5867 | elf_x86_64_nacl_plt0_entry, /* plt0_entry */ |
| 5868 | elf_x86_64_nacl_plt_entry, /* plt_entry */ |
| 5869 | NACL_PLT_ENTRY_SIZE, /* plt_entry_size */ |
| 5870 | 2, /* plt0_got1_offset */ |
| 5871 | 9, /* plt0_got2_offset */ |
| 5872 | 13, /* plt0_got2_insn_end */ |
| 5873 | 3, /* plt_got_offset */ |
| 5874 | 33, /* plt_reloc_offset */ |
| 5875 | 38, /* plt_plt_offset */ |
| 5876 | 7, /* plt_got_insn_size */ |
| 5877 | 42, /* plt_plt_insn_end */ |
| 5878 | 32, /* plt_lazy_offset */ |
| 5879 | elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */ |
| 5880 | sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */ |
| 5881 | }; |
| 5882 | |
| 5883 | #undef elf_backend_arch_data |
| 5884 | #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed |
| 5885 | |
| 5886 | #undef elf_backend_object_p |
| 5887 | #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p |
| 5888 | #undef elf_backend_modify_segment_map |
| 5889 | #define elf_backend_modify_segment_map nacl_modify_segment_map |
| 5890 | #undef elf_backend_modify_program_headers |
| 5891 | #define elf_backend_modify_program_headers nacl_modify_program_headers |
| 5892 | #undef elf_backend_final_write_processing |
| 5893 | #define elf_backend_final_write_processing nacl_final_write_processing |
| 5894 | |
| 5895 | #include "elf64-target.h" |
| 5896 | |
| 5897 | /* Native Client x32 support. */ |
| 5898 | |
| 5899 | static bfd_boolean |
| 5900 | elf32_x86_64_nacl_elf_object_p (bfd *abfd) |
| 5901 | { |
| 5902 | /* Set the right machine number for a NaCl x86-64 ELF32 file. */ |
| 5903 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl); |
| 5904 | return TRUE; |
| 5905 | } |
| 5906 | |
| 5907 | #undef TARGET_LITTLE_SYM |
| 5908 | #define TARGET_LITTLE_SYM bfd_elf32_x86_64_nacl_vec |
| 5909 | #undef TARGET_LITTLE_NAME |
| 5910 | #define TARGET_LITTLE_NAME "elf32-x86-64-nacl" |
| 5911 | #undef elf32_bed |
| 5912 | #define elf32_bed elf32_x86_64_nacl_bed |
| 5913 | |
| 5914 | #define bfd_elf32_bfd_link_hash_table_create \ |
| 5915 | elf_x86_64_link_hash_table_create |
| 5916 | #define bfd_elf32_bfd_link_hash_table_free \ |
| 5917 | elf_x86_64_link_hash_table_free |
| 5918 | #define bfd_elf32_bfd_reloc_type_lookup \ |
| 5919 | elf_x86_64_reloc_type_lookup |
| 5920 | #define bfd_elf32_bfd_reloc_name_lookup \ |
| 5921 | elf_x86_64_reloc_name_lookup |
| 5922 | #define bfd_elf32_mkobject \ |
| 5923 | elf_x86_64_mkobject |
| 5924 | |
| 5925 | #undef elf_backend_object_p |
| 5926 | #define elf_backend_object_p \ |
| 5927 | elf32_x86_64_nacl_elf_object_p |
| 5928 | |
| 5929 | #undef elf_backend_bfd_from_remote_memory |
| 5930 | #define elf_backend_bfd_from_remote_memory \ |
| 5931 | _bfd_elf32_bfd_from_remote_memory |
| 5932 | |
| 5933 | #undef elf_backend_size_info |
| 5934 | #define elf_backend_size_info \ |
| 5935 | _bfd_elf32_size_info |
| 5936 | |
| 5937 | #include "elf32-target.h" |
| 5938 | |
| 5939 | /* Restore defaults. */ |
| 5940 | #undef elf_backend_object_p |
| 5941 | #define elf_backend_object_p elf64_x86_64_elf_object_p |
| 5942 | #undef elf_backend_bfd_from_remote_memory |
| 5943 | #undef elf_backend_size_info |
| 5944 | #undef elf_backend_modify_segment_map |
| 5945 | #undef elf_backend_modify_program_headers |
| 5946 | #undef elf_backend_final_write_processing |
| 5947 | |
| 5948 | /* Intel L1OM support. */ |
| 5949 | |
| 5950 | static bfd_boolean |
| 5951 | elf64_l1om_elf_object_p (bfd *abfd) |
| 5952 | { |
| 5953 | /* Set the right machine number for an L1OM elf64 file. */ |
| 5954 | bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om); |
| 5955 | return TRUE; |
| 5956 | } |
| 5957 | |
| 5958 | #undef TARGET_LITTLE_SYM |
| 5959 | #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec |
| 5960 | #undef TARGET_LITTLE_NAME |
| 5961 | #define TARGET_LITTLE_NAME "elf64-l1om" |
| 5962 | #undef ELF_ARCH |
| 5963 | #define ELF_ARCH bfd_arch_l1om |
| 5964 | |
| 5965 | #undef ELF_MACHINE_CODE |
| 5966 | #define ELF_MACHINE_CODE EM_L1OM |
| 5967 | |
| 5968 | #undef ELF_OSABI |
| 5969 | |
| 5970 | #undef elf64_bed |
| 5971 | #define elf64_bed elf64_l1om_bed |
| 5972 | |
| 5973 | #undef elf_backend_object_p |
| 5974 | #define elf_backend_object_p elf64_l1om_elf_object_p |
| 5975 | |
| 5976 | /* Restore defaults. */ |
| 5977 | #undef ELF_MAXPAGESIZE |
| 5978 | #undef ELF_MINPAGESIZE |
| 5979 | #undef ELF_COMMONPAGESIZE |
| 5980 | #define ELF_MAXPAGESIZE 0x200000 |
| 5981 | #define ELF_MINPAGESIZE 0x1000 |
| 5982 | #define ELF_COMMONPAGESIZE 0x1000 |
| 5983 | #undef elf_backend_plt_alignment |
| 5984 | #define elf_backend_plt_alignment 4 |
| 5985 | #undef elf_backend_arch_data |
| 5986 | #define elf_backend_arch_data &elf_x86_64_arch_bed |
| 5987 | |
| 5988 | #include "elf64-target.h" |
| 5989 | |
| 5990 | /* FreeBSD L1OM support. */ |
| 5991 | |
| 5992 | #undef TARGET_LITTLE_SYM |
| 5993 | #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec |
| 5994 | #undef TARGET_LITTLE_NAME |
| 5995 | #define TARGET_LITTLE_NAME "elf64-l1om-freebsd" |
| 5996 | |
| 5997 | #undef ELF_OSABI |
| 5998 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 5999 | |
| 6000 | #undef elf64_bed |
| 6001 | #define elf64_bed elf64_l1om_fbsd_bed |
| 6002 | |
| 6003 | #include "elf64-target.h" |
| 6004 | |
| 6005 | /* Intel K1OM support. */ |
| 6006 | |
| 6007 | static bfd_boolean |
| 6008 | elf64_k1om_elf_object_p (bfd *abfd) |
| 6009 | { |
| 6010 | /* Set the right machine number for an K1OM elf64 file. */ |
| 6011 | bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om); |
| 6012 | return TRUE; |
| 6013 | } |
| 6014 | |
| 6015 | #undef TARGET_LITTLE_SYM |
| 6016 | #define TARGET_LITTLE_SYM bfd_elf64_k1om_vec |
| 6017 | #undef TARGET_LITTLE_NAME |
| 6018 | #define TARGET_LITTLE_NAME "elf64-k1om" |
| 6019 | #undef ELF_ARCH |
| 6020 | #define ELF_ARCH bfd_arch_k1om |
| 6021 | |
| 6022 | #undef ELF_MACHINE_CODE |
| 6023 | #define ELF_MACHINE_CODE EM_K1OM |
| 6024 | |
| 6025 | #undef ELF_OSABI |
| 6026 | |
| 6027 | #undef elf64_bed |
| 6028 | #define elf64_bed elf64_k1om_bed |
| 6029 | |
| 6030 | #undef elf_backend_object_p |
| 6031 | #define elf_backend_object_p elf64_k1om_elf_object_p |
| 6032 | |
| 6033 | #undef elf_backend_static_tls_alignment |
| 6034 | |
| 6035 | #undef elf_backend_want_plt_sym |
| 6036 | #define elf_backend_want_plt_sym 0 |
| 6037 | |
| 6038 | #include "elf64-target.h" |
| 6039 | |
| 6040 | /* FreeBSD K1OM support. */ |
| 6041 | |
| 6042 | #undef TARGET_LITTLE_SYM |
| 6043 | #define TARGET_LITTLE_SYM bfd_elf64_k1om_freebsd_vec |
| 6044 | #undef TARGET_LITTLE_NAME |
| 6045 | #define TARGET_LITTLE_NAME "elf64-k1om-freebsd" |
| 6046 | |
| 6047 | #undef ELF_OSABI |
| 6048 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 6049 | |
| 6050 | #undef elf64_bed |
| 6051 | #define elf64_bed elf64_k1om_fbsd_bed |
| 6052 | |
| 6053 | #include "elf64-target.h" |
| 6054 | |
| 6055 | /* 32bit x86-64 support. */ |
| 6056 | |
| 6057 | #undef TARGET_LITTLE_SYM |
| 6058 | #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec |
| 6059 | #undef TARGET_LITTLE_NAME |
| 6060 | #define TARGET_LITTLE_NAME "elf32-x86-64" |
| 6061 | #undef elf32_bed |
| 6062 | |
| 6063 | #undef ELF_ARCH |
| 6064 | #define ELF_ARCH bfd_arch_i386 |
| 6065 | |
| 6066 | #undef ELF_MACHINE_CODE |
| 6067 | #define ELF_MACHINE_CODE EM_X86_64 |
| 6068 | |
| 6069 | #undef ELF_OSABI |
| 6070 | |
| 6071 | #undef elf_backend_object_p |
| 6072 | #define elf_backend_object_p \ |
| 6073 | elf32_x86_64_elf_object_p |
| 6074 | |
| 6075 | #undef elf_backend_bfd_from_remote_memory |
| 6076 | #define elf_backend_bfd_from_remote_memory \ |
| 6077 | _bfd_elf32_bfd_from_remote_memory |
| 6078 | |
| 6079 | #undef elf_backend_size_info |
| 6080 | #define elf_backend_size_info \ |
| 6081 | _bfd_elf32_size_info |
| 6082 | |
| 6083 | #include "elf32-target.h" |