| 1 | /* X86-64 specific support for ELF |
| 2 | Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, |
| 3 | 2010, 2011 |
| 4 | Free Software Foundation, Inc. |
| 5 | Contributed by Jan Hubicka <jh@suse.cz>. |
| 6 | |
| 7 | This file is part of BFD, the Binary File Descriptor library. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 22 | MA 02110-1301, USA. */ |
| 23 | |
| 24 | #include "sysdep.h" |
| 25 | #include "bfd.h" |
| 26 | #include "bfdlink.h" |
| 27 | #include "libbfd.h" |
| 28 | #include "elf-bfd.h" |
| 29 | #include "bfd_stdint.h" |
| 30 | #include "objalloc.h" |
| 31 | #include "hashtab.h" |
| 32 | |
| 33 | #include "elf/x86-64.h" |
| 34 | |
| 35 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ |
| 36 | #define MINUS_ONE (~ (bfd_vma) 0) |
| 37 | |
| 38 | /* Since both 32-bit and 64-bit x86-64 encode relocation type in the |
| 39 | identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get |
| 40 | relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE |
| 41 | since they are the same. */ |
| 42 | |
| 43 | #define ABI_64_P(abfd) \ |
| 44 | (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64) |
| 45 | |
| 46 | /* The relocation "howto" table. Order of fields: |
| 47 | type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow, |
| 48 | special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */ |
| 49 | static reloc_howto_type x86_64_elf_howto_table[] = |
| 50 | { |
| 51 | HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont, |
| 52 | bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000, |
| 53 | FALSE), |
| 54 | HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 55 | bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE, |
| 56 | FALSE), |
| 57 | HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 58 | bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff, |
| 59 | TRUE), |
| 60 | HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 61 | bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff, |
| 62 | FALSE), |
| 63 | HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 64 | bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff, |
| 65 | TRUE), |
| 66 | HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 67 | bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff, |
| 68 | FALSE), |
| 69 | HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 70 | bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE, |
| 71 | MINUS_ONE, FALSE), |
| 72 | HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 73 | bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE, |
| 74 | MINUS_ONE, FALSE), |
| 75 | HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 76 | bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE, |
| 77 | MINUS_ONE, FALSE), |
| 78 | HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 79 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff, |
| 80 | 0xffffffff, TRUE), |
| 81 | HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, |
| 82 | bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, |
| 83 | FALSE), |
| 84 | HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 85 | bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff, |
| 86 | FALSE), |
| 87 | HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, |
| 88 | bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE), |
| 89 | HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield, |
| 90 | bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE), |
| 91 | HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, |
| 92 | bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE), |
| 93 | HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, |
| 94 | bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE), |
| 95 | HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 96 | bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE, |
| 97 | MINUS_ONE, FALSE), |
| 98 | HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 99 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE, |
| 100 | MINUS_ONE, FALSE), |
| 101 | HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 102 | bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE, |
| 103 | MINUS_ONE, FALSE), |
| 104 | HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 105 | bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff, |
| 106 | 0xffffffff, TRUE), |
| 107 | HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 108 | bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff, |
| 109 | 0xffffffff, TRUE), |
| 110 | HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 111 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff, |
| 112 | 0xffffffff, FALSE), |
| 113 | HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 114 | bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff, |
| 115 | 0xffffffff, TRUE), |
| 116 | HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 117 | bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff, |
| 118 | 0xffffffff, FALSE), |
| 119 | HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, |
| 120 | bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE, |
| 121 | TRUE), |
| 122 | HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 123 | bfd_elf_generic_reloc, "R_X86_64_GOTOFF64", |
| 124 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), |
| 125 | HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 126 | bfd_elf_generic_reloc, "R_X86_64_GOTPC32", |
| 127 | FALSE, 0xffffffff, 0xffffffff, TRUE), |
| 128 | HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 129 | bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE, |
| 130 | FALSE), |
| 131 | HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed, |
| 132 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE, |
| 133 | MINUS_ONE, TRUE), |
| 134 | HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed, |
| 135 | bfd_elf_generic_reloc, "R_X86_64_GOTPC64", |
| 136 | FALSE, MINUS_ONE, MINUS_ONE, TRUE), |
| 137 | HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 138 | bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE, |
| 139 | MINUS_ONE, FALSE), |
| 140 | HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 141 | bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE, |
| 142 | MINUS_ONE, FALSE), |
| 143 | EMPTY_HOWTO (32), |
| 144 | EMPTY_HOWTO (33), |
| 145 | HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0, |
| 146 | complain_overflow_bitfield, bfd_elf_generic_reloc, |
| 147 | "R_X86_64_GOTPC32_TLSDESC", |
| 148 | FALSE, 0xffffffff, 0xffffffff, TRUE), |
| 149 | HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0, |
| 150 | complain_overflow_dont, bfd_elf_generic_reloc, |
| 151 | "R_X86_64_TLSDESC_CALL", |
| 152 | FALSE, 0, 0, FALSE), |
| 153 | HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0, |
| 154 | complain_overflow_bitfield, bfd_elf_generic_reloc, |
| 155 | "R_X86_64_TLSDESC", |
| 156 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), |
| 157 | HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 158 | bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE, |
| 159 | MINUS_ONE, FALSE), |
| 160 | |
| 161 | /* We have a gap in the reloc numbers here. |
| 162 | R_X86_64_standard counts the number up to this point, and |
| 163 | R_X86_64_vt_offset is the value to subtract from a reloc type of |
| 164 | R_X86_64_GNU_VT* to form an index into this table. */ |
| 165 | #define R_X86_64_standard (R_X86_64_IRELATIVE + 1) |
| 166 | #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard) |
| 167 | |
| 168 | /* GNU extension to record C++ vtable hierarchy. */ |
| 169 | HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| 170 | NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE), |
| 171 | |
| 172 | /* GNU extension to record C++ vtable member usage. */ |
| 173 | HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| 174 | _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0, |
| 175 | FALSE) |
| 176 | }; |
| 177 | |
| 178 | #define IS_X86_64_PCREL_TYPE(TYPE) \ |
| 179 | ( ((TYPE) == R_X86_64_PC8) \ |
| 180 | || ((TYPE) == R_X86_64_PC16) \ |
| 181 | || ((TYPE) == R_X86_64_PC32) \ |
| 182 | || ((TYPE) == R_X86_64_PC64)) |
| 183 | |
| 184 | /* Map BFD relocs to the x86_64 elf relocs. */ |
| 185 | struct elf_reloc_map |
| 186 | { |
| 187 | bfd_reloc_code_real_type bfd_reloc_val; |
| 188 | unsigned char elf_reloc_val; |
| 189 | }; |
| 190 | |
| 191 | static const struct elf_reloc_map x86_64_reloc_map[] = |
| 192 | { |
| 193 | { BFD_RELOC_NONE, R_X86_64_NONE, }, |
| 194 | { BFD_RELOC_64, R_X86_64_64, }, |
| 195 | { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, |
| 196 | { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, |
| 197 | { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, |
| 198 | { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, |
| 199 | { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, |
| 200 | { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, |
| 201 | { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, |
| 202 | { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, |
| 203 | { BFD_RELOC_32, R_X86_64_32, }, |
| 204 | { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, |
| 205 | { BFD_RELOC_16, R_X86_64_16, }, |
| 206 | { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, |
| 207 | { BFD_RELOC_8, R_X86_64_8, }, |
| 208 | { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, |
| 209 | { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, |
| 210 | { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, |
| 211 | { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, |
| 212 | { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, |
| 213 | { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, |
| 214 | { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, |
| 215 | { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, |
| 216 | { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, |
| 217 | { BFD_RELOC_64_PCREL, R_X86_64_PC64, }, |
| 218 | { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, }, |
| 219 | { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, }, |
| 220 | { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, }, |
| 221 | { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, }, |
| 222 | { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, }, |
| 223 | { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, }, |
| 224 | { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, }, |
| 225 | { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, }, |
| 226 | { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, }, |
| 227 | { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, }, |
| 228 | { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, }, |
| 229 | { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, |
| 230 | { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, |
| 231 | }; |
| 232 | |
| 233 | static reloc_howto_type * |
| 234 | elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type) |
| 235 | { |
| 236 | unsigned i; |
| 237 | |
| 238 | if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT |
| 239 | || r_type >= (unsigned int) R_X86_64_max) |
| 240 | { |
| 241 | if (r_type >= (unsigned int) R_X86_64_standard) |
| 242 | { |
| 243 | (*_bfd_error_handler) (_("%B: invalid relocation type %d"), |
| 244 | abfd, (int) r_type); |
| 245 | r_type = R_X86_64_NONE; |
| 246 | } |
| 247 | i = r_type; |
| 248 | } |
| 249 | else |
| 250 | i = r_type - (unsigned int) R_X86_64_vt_offset; |
| 251 | BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type); |
| 252 | return &x86_64_elf_howto_table[i]; |
| 253 | } |
| 254 | |
| 255 | /* Given a BFD reloc type, return a HOWTO structure. */ |
| 256 | static reloc_howto_type * |
| 257 | elf_x86_64_reloc_type_lookup (bfd *abfd, |
| 258 | bfd_reloc_code_real_type code) |
| 259 | { |
| 260 | unsigned int i; |
| 261 | |
| 262 | for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); |
| 263 | i++) |
| 264 | { |
| 265 | if (x86_64_reloc_map[i].bfd_reloc_val == code) |
| 266 | return elf_x86_64_rtype_to_howto (abfd, |
| 267 | x86_64_reloc_map[i].elf_reloc_val); |
| 268 | } |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | static reloc_howto_type * |
| 273 | elf_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 274 | const char *r_name) |
| 275 | { |
| 276 | unsigned int i; |
| 277 | |
| 278 | for (i = 0; |
| 279 | i < (sizeof (x86_64_elf_howto_table) |
| 280 | / sizeof (x86_64_elf_howto_table[0])); |
| 281 | i++) |
| 282 | if (x86_64_elf_howto_table[i].name != NULL |
| 283 | && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0) |
| 284 | return &x86_64_elf_howto_table[i]; |
| 285 | |
| 286 | return NULL; |
| 287 | } |
| 288 | |
| 289 | /* Given an x86_64 ELF reloc type, fill in an arelent structure. */ |
| 290 | |
| 291 | static void |
| 292 | elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, |
| 293 | Elf_Internal_Rela *dst) |
| 294 | { |
| 295 | unsigned r_type; |
| 296 | |
| 297 | r_type = ELF32_R_TYPE (dst->r_info); |
| 298 | cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type); |
| 299 | BFD_ASSERT (r_type == cache_ptr->howto->type); |
| 300 | } |
| 301 | \f |
| 302 | /* Support for core dump NOTE sections. */ |
| 303 | static bfd_boolean |
| 304 | elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 305 | { |
| 306 | int offset; |
| 307 | size_t size; |
| 308 | |
| 309 | switch (note->descsz) |
| 310 | { |
| 311 | default: |
| 312 | return FALSE; |
| 313 | |
| 314 | case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ |
| 315 | /* pr_cursig */ |
| 316 | elf_tdata (abfd)->core_signal |
| 317 | = bfd_get_16 (abfd, note->descdata + 12); |
| 318 | |
| 319 | /* pr_pid */ |
| 320 | elf_tdata (abfd)->core_lwpid |
| 321 | = bfd_get_32 (abfd, note->descdata + 32); |
| 322 | |
| 323 | /* pr_reg */ |
| 324 | offset = 112; |
| 325 | size = 216; |
| 326 | |
| 327 | break; |
| 328 | } |
| 329 | |
| 330 | /* Make a ".reg/999" section. */ |
| 331 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 332 | size, note->descpos + offset); |
| 333 | } |
| 334 | |
| 335 | static bfd_boolean |
| 336 | elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 337 | { |
| 338 | switch (note->descsz) |
| 339 | { |
| 340 | default: |
| 341 | return FALSE; |
| 342 | |
| 343 | case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ |
| 344 | elf_tdata (abfd)->core_pid |
| 345 | = bfd_get_32 (abfd, note->descdata + 24); |
| 346 | elf_tdata (abfd)->core_program |
| 347 | = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); |
| 348 | elf_tdata (abfd)->core_command |
| 349 | = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); |
| 350 | } |
| 351 | |
| 352 | /* Note that for some reason, a spurious space is tacked |
| 353 | onto the end of the args in some (at least one anyway) |
| 354 | implementations, so strip it off if it exists. */ |
| 355 | |
| 356 | { |
| 357 | char *command = elf_tdata (abfd)->core_command; |
| 358 | int n = strlen (command); |
| 359 | |
| 360 | if (0 < n && command[n - 1] == ' ') |
| 361 | command[n - 1] = '\0'; |
| 362 | } |
| 363 | |
| 364 | return TRUE; |
| 365 | } |
| 366 | \f |
| 367 | /* Functions for the x86-64 ELF linker. */ |
| 368 | |
| 369 | /* The name of the dynamic interpreter. This is put in the .interp |
| 370 | section. */ |
| 371 | |
| 372 | #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1" |
| 373 | #define ELF32_DYNAMIC_INTERPRETER "/lib/ld32.so.1" |
| 374 | |
| 375 | /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid |
| 376 | copying dynamic variables from a shared lib into an app's dynbss |
| 377 | section, and instead use a dynamic relocation to point into the |
| 378 | shared lib. */ |
| 379 | #define ELIMINATE_COPY_RELOCS 1 |
| 380 | |
| 381 | /* The size in bytes of an entry in the global offset table. */ |
| 382 | |
| 383 | #define GOT_ENTRY_SIZE 8 |
| 384 | |
| 385 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 386 | |
| 387 | #define PLT_ENTRY_SIZE 16 |
| 388 | |
| 389 | /* The first entry in a procedure linkage table looks like this. See the |
| 390 | SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */ |
| 391 | |
| 392 | static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] = |
| 393 | { |
| 394 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
| 395 | 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ |
| 396 | 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ |
| 397 | }; |
| 398 | |
| 399 | /* Subsequent entries in a procedure linkage table look like this. */ |
| 400 | |
| 401 | static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] = |
| 402 | { |
| 403 | 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ |
| 404 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 405 | 0x68, /* pushq immediate */ |
| 406 | 0, 0, 0, 0, /* replaced with index into relocation table. */ |
| 407 | 0xe9, /* jmp relative */ |
| 408 | 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ |
| 409 | }; |
| 410 | |
| 411 | /* x86-64 ELF linker hash entry. */ |
| 412 | |
| 413 | struct elf_x86_64_link_hash_entry |
| 414 | { |
| 415 | struct elf_link_hash_entry elf; |
| 416 | |
| 417 | /* Track dynamic relocs copied for this symbol. */ |
| 418 | struct elf_dyn_relocs *dyn_relocs; |
| 419 | |
| 420 | #define GOT_UNKNOWN 0 |
| 421 | #define GOT_NORMAL 1 |
| 422 | #define GOT_TLS_GD 2 |
| 423 | #define GOT_TLS_IE 3 |
| 424 | #define GOT_TLS_GDESC 4 |
| 425 | #define GOT_TLS_GD_BOTH_P(type) \ |
| 426 | ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) |
| 427 | #define GOT_TLS_GD_P(type) \ |
| 428 | ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) |
| 429 | #define GOT_TLS_GDESC_P(type) \ |
| 430 | ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) |
| 431 | #define GOT_TLS_GD_ANY_P(type) \ |
| 432 | (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) |
| 433 | unsigned char tls_type; |
| 434 | |
| 435 | /* Offset of the GOTPLT entry reserved for the TLS descriptor, |
| 436 | starting at the end of the jump table. */ |
| 437 | bfd_vma tlsdesc_got; |
| 438 | }; |
| 439 | |
| 440 | #define elf_x86_64_hash_entry(ent) \ |
| 441 | ((struct elf_x86_64_link_hash_entry *)(ent)) |
| 442 | |
| 443 | struct elf_x86_64_obj_tdata |
| 444 | { |
| 445 | struct elf_obj_tdata root; |
| 446 | |
| 447 | /* tls_type for each local got entry. */ |
| 448 | char *local_got_tls_type; |
| 449 | |
| 450 | /* GOTPLT entries for TLS descriptors. */ |
| 451 | bfd_vma *local_tlsdesc_gotent; |
| 452 | }; |
| 453 | |
| 454 | #define elf_x86_64_tdata(abfd) \ |
| 455 | ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any) |
| 456 | |
| 457 | #define elf_x86_64_local_got_tls_type(abfd) \ |
| 458 | (elf_x86_64_tdata (abfd)->local_got_tls_type) |
| 459 | |
| 460 | #define elf_x86_64_local_tlsdesc_gotent(abfd) \ |
| 461 | (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent) |
| 462 | |
| 463 | #define is_x86_64_elf(bfd) \ |
| 464 | (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ |
| 465 | && elf_tdata (bfd) != NULL \ |
| 466 | && elf_object_id (bfd) == X86_64_ELF_DATA) |
| 467 | |
| 468 | static bfd_boolean |
| 469 | elf_x86_64_mkobject (bfd *abfd) |
| 470 | { |
| 471 | return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata), |
| 472 | X86_64_ELF_DATA); |
| 473 | } |
| 474 | |
| 475 | /* x86-64 ELF linker hash table. */ |
| 476 | |
| 477 | struct elf_x86_64_link_hash_table |
| 478 | { |
| 479 | struct elf_link_hash_table elf; |
| 480 | |
| 481 | /* Short-cuts to get to dynamic linker sections. */ |
| 482 | asection *sdynbss; |
| 483 | asection *srelbss; |
| 484 | |
| 485 | union |
| 486 | { |
| 487 | bfd_signed_vma refcount; |
| 488 | bfd_vma offset; |
| 489 | } tls_ld_got; |
| 490 | |
| 491 | /* The amount of space used by the jump slots in the GOT. */ |
| 492 | bfd_vma sgotplt_jump_table_size; |
| 493 | |
| 494 | /* Small local sym cache. */ |
| 495 | struct sym_cache sym_cache; |
| 496 | |
| 497 | bfd_vma (*r_info) (bfd_vma, bfd_vma); |
| 498 | bfd_vma (*r_sym) (bfd_vma); |
| 499 | unsigned int pointer_r_type; |
| 500 | const char *dynamic_interpreter; |
| 501 | int dynamic_interpreter_size; |
| 502 | |
| 503 | /* _TLS_MODULE_BASE_ symbol. */ |
| 504 | struct bfd_link_hash_entry *tls_module_base; |
| 505 | |
| 506 | /* Used by local STT_GNU_IFUNC symbols. */ |
| 507 | htab_t loc_hash_table; |
| 508 | void * loc_hash_memory; |
| 509 | |
| 510 | /* The offset into splt of the PLT entry for the TLS descriptor |
| 511 | resolver. Special values are 0, if not necessary (or not found |
| 512 | to be necessary yet), and -1 if needed but not determined |
| 513 | yet. */ |
| 514 | bfd_vma tlsdesc_plt; |
| 515 | /* The offset into sgot of the GOT entry used by the PLT entry |
| 516 | above. */ |
| 517 | bfd_vma tlsdesc_got; |
| 518 | }; |
| 519 | |
| 520 | /* Get the x86-64 ELF linker hash table from a link_info structure. */ |
| 521 | |
| 522 | #define elf_x86_64_hash_table(p) \ |
| 523 | (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ |
| 524 | == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL) |
| 525 | |
| 526 | #define elf_x86_64_compute_jump_table_size(htab) \ |
| 527 | ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE) |
| 528 | |
| 529 | /* Create an entry in an x86-64 ELF linker hash table. */ |
| 530 | |
| 531 | static struct bfd_hash_entry * |
| 532 | elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry, |
| 533 | struct bfd_hash_table *table, |
| 534 | const char *string) |
| 535 | { |
| 536 | /* Allocate the structure if it has not already been allocated by a |
| 537 | subclass. */ |
| 538 | if (entry == NULL) |
| 539 | { |
| 540 | entry = (struct bfd_hash_entry *) |
| 541 | bfd_hash_allocate (table, |
| 542 | sizeof (struct elf_x86_64_link_hash_entry)); |
| 543 | if (entry == NULL) |
| 544 | return entry; |
| 545 | } |
| 546 | |
| 547 | /* Call the allocation method of the superclass. */ |
| 548 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 549 | if (entry != NULL) |
| 550 | { |
| 551 | struct elf_x86_64_link_hash_entry *eh; |
| 552 | |
| 553 | eh = (struct elf_x86_64_link_hash_entry *) entry; |
| 554 | eh->dyn_relocs = NULL; |
| 555 | eh->tls_type = GOT_UNKNOWN; |
| 556 | eh->tlsdesc_got = (bfd_vma) -1; |
| 557 | } |
| 558 | |
| 559 | return entry; |
| 560 | } |
| 561 | |
| 562 | /* Compute a hash of a local hash entry. We use elf_link_hash_entry |
| 563 | for local symbol so that we can handle local STT_GNU_IFUNC symbols |
| 564 | as global symbol. We reuse indx and dynstr_index for local symbol |
| 565 | hash since they aren't used by global symbols in this backend. */ |
| 566 | |
| 567 | static hashval_t |
| 568 | elf_x86_64_local_htab_hash (const void *ptr) |
| 569 | { |
| 570 | struct elf_link_hash_entry *h |
| 571 | = (struct elf_link_hash_entry *) ptr; |
| 572 | return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index); |
| 573 | } |
| 574 | |
| 575 | /* Compare local hash entries. */ |
| 576 | |
| 577 | static int |
| 578 | elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2) |
| 579 | { |
| 580 | struct elf_link_hash_entry *h1 |
| 581 | = (struct elf_link_hash_entry *) ptr1; |
| 582 | struct elf_link_hash_entry *h2 |
| 583 | = (struct elf_link_hash_entry *) ptr2; |
| 584 | |
| 585 | return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index; |
| 586 | } |
| 587 | |
| 588 | /* Find and/or create a hash entry for local symbol. */ |
| 589 | |
| 590 | static struct elf_link_hash_entry * |
| 591 | elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab, |
| 592 | bfd *abfd, const Elf_Internal_Rela *rel, |
| 593 | bfd_boolean create) |
| 594 | { |
| 595 | struct elf_x86_64_link_hash_entry e, *ret; |
| 596 | asection *sec = abfd->sections; |
| 597 | hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id, |
| 598 | htab->r_sym (rel->r_info)); |
| 599 | void **slot; |
| 600 | |
| 601 | e.elf.indx = sec->id; |
| 602 | e.elf.dynstr_index = htab->r_sym (rel->r_info); |
| 603 | slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h, |
| 604 | create ? INSERT : NO_INSERT); |
| 605 | |
| 606 | if (!slot) |
| 607 | return NULL; |
| 608 | |
| 609 | if (*slot) |
| 610 | { |
| 611 | ret = (struct elf_x86_64_link_hash_entry *) *slot; |
| 612 | return &ret->elf; |
| 613 | } |
| 614 | |
| 615 | ret = (struct elf_x86_64_link_hash_entry *) |
| 616 | objalloc_alloc ((struct objalloc *) htab->loc_hash_memory, |
| 617 | sizeof (struct elf_x86_64_link_hash_entry)); |
| 618 | if (ret) |
| 619 | { |
| 620 | memset (ret, 0, sizeof (*ret)); |
| 621 | ret->elf.indx = sec->id; |
| 622 | ret->elf.dynstr_index = htab->r_sym (rel->r_info); |
| 623 | ret->elf.dynindx = -1; |
| 624 | *slot = ret; |
| 625 | } |
| 626 | return &ret->elf; |
| 627 | } |
| 628 | |
| 629 | /* Create an X86-64 ELF linker hash table. */ |
| 630 | |
| 631 | static struct bfd_link_hash_table * |
| 632 | elf_x86_64_link_hash_table_create (bfd *abfd) |
| 633 | { |
| 634 | struct elf_x86_64_link_hash_table *ret; |
| 635 | bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table); |
| 636 | |
| 637 | ret = (struct elf_x86_64_link_hash_table *) bfd_malloc (amt); |
| 638 | if (ret == NULL) |
| 639 | return NULL; |
| 640 | |
| 641 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, |
| 642 | elf_x86_64_link_hash_newfunc, |
| 643 | sizeof (struct elf_x86_64_link_hash_entry), |
| 644 | X86_64_ELF_DATA)) |
| 645 | { |
| 646 | free (ret); |
| 647 | return NULL; |
| 648 | } |
| 649 | |
| 650 | ret->sdynbss = NULL; |
| 651 | ret->srelbss = NULL; |
| 652 | ret->sym_cache.abfd = NULL; |
| 653 | ret->tlsdesc_plt = 0; |
| 654 | ret->tlsdesc_got = 0; |
| 655 | ret->tls_ld_got.refcount = 0; |
| 656 | ret->sgotplt_jump_table_size = 0; |
| 657 | ret->tls_module_base = NULL; |
| 658 | |
| 659 | if (ABI_64_P (abfd)) |
| 660 | { |
| 661 | ret->r_info = elf64_r_info; |
| 662 | ret->r_sym = elf64_r_sym; |
| 663 | ret->pointer_r_type = R_X86_64_64; |
| 664 | ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER; |
| 665 | ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER; |
| 666 | } |
| 667 | else |
| 668 | { |
| 669 | ret->r_info = elf32_r_info; |
| 670 | ret->r_sym = elf32_r_sym; |
| 671 | ret->pointer_r_type = R_X86_64_32; |
| 672 | ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER; |
| 673 | ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER; |
| 674 | } |
| 675 | |
| 676 | ret->loc_hash_table = htab_try_create (1024, |
| 677 | elf_x86_64_local_htab_hash, |
| 678 | elf_x86_64_local_htab_eq, |
| 679 | NULL); |
| 680 | ret->loc_hash_memory = objalloc_create (); |
| 681 | if (!ret->loc_hash_table || !ret->loc_hash_memory) |
| 682 | { |
| 683 | free (ret); |
| 684 | return NULL; |
| 685 | } |
| 686 | |
| 687 | return &ret->elf.root; |
| 688 | } |
| 689 | |
| 690 | /* Destroy an X86-64 ELF linker hash table. */ |
| 691 | |
| 692 | static void |
| 693 | elf_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash) |
| 694 | { |
| 695 | struct elf_x86_64_link_hash_table *htab |
| 696 | = (struct elf_x86_64_link_hash_table *) hash; |
| 697 | |
| 698 | if (htab->loc_hash_table) |
| 699 | htab_delete (htab->loc_hash_table); |
| 700 | if (htab->loc_hash_memory) |
| 701 | objalloc_free ((struct objalloc *) htab->loc_hash_memory); |
| 702 | _bfd_generic_link_hash_table_free (hash); |
| 703 | } |
| 704 | |
| 705 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and |
| 706 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 707 | hash table. */ |
| 708 | |
| 709 | static bfd_boolean |
| 710 | elf_x86_64_create_dynamic_sections (bfd *dynobj, |
| 711 | struct bfd_link_info *info) |
| 712 | { |
| 713 | struct elf_x86_64_link_hash_table *htab; |
| 714 | |
| 715 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 716 | return FALSE; |
| 717 | |
| 718 | htab = elf_x86_64_hash_table (info); |
| 719 | if (htab == NULL) |
| 720 | return FALSE; |
| 721 | |
| 722 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 723 | if (!info->shared) |
| 724 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); |
| 725 | |
| 726 | if (!htab->sdynbss |
| 727 | || (!info->shared && !htab->srelbss)) |
| 728 | abort (); |
| 729 | |
| 730 | return TRUE; |
| 731 | } |
| 732 | |
| 733 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 734 | |
| 735 | static void |
| 736 | elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info, |
| 737 | struct elf_link_hash_entry *dir, |
| 738 | struct elf_link_hash_entry *ind) |
| 739 | { |
| 740 | struct elf_x86_64_link_hash_entry *edir, *eind; |
| 741 | |
| 742 | edir = (struct elf_x86_64_link_hash_entry *) dir; |
| 743 | eind = (struct elf_x86_64_link_hash_entry *) ind; |
| 744 | |
| 745 | if (eind->dyn_relocs != NULL) |
| 746 | { |
| 747 | if (edir->dyn_relocs != NULL) |
| 748 | { |
| 749 | struct elf_dyn_relocs **pp; |
| 750 | struct elf_dyn_relocs *p; |
| 751 | |
| 752 | /* Add reloc counts against the indirect sym to the direct sym |
| 753 | list. Merge any entries against the same section. */ |
| 754 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| 755 | { |
| 756 | struct elf_dyn_relocs *q; |
| 757 | |
| 758 | for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| 759 | if (q->sec == p->sec) |
| 760 | { |
| 761 | q->pc_count += p->pc_count; |
| 762 | q->count += p->count; |
| 763 | *pp = p->next; |
| 764 | break; |
| 765 | } |
| 766 | if (q == NULL) |
| 767 | pp = &p->next; |
| 768 | } |
| 769 | *pp = edir->dyn_relocs; |
| 770 | } |
| 771 | |
| 772 | edir->dyn_relocs = eind->dyn_relocs; |
| 773 | eind->dyn_relocs = NULL; |
| 774 | } |
| 775 | |
| 776 | if (ind->root.type == bfd_link_hash_indirect |
| 777 | && dir->got.refcount <= 0) |
| 778 | { |
| 779 | edir->tls_type = eind->tls_type; |
| 780 | eind->tls_type = GOT_UNKNOWN; |
| 781 | } |
| 782 | |
| 783 | if (ELIMINATE_COPY_RELOCS |
| 784 | && ind->root.type != bfd_link_hash_indirect |
| 785 | && dir->dynamic_adjusted) |
| 786 | { |
| 787 | /* If called to transfer flags for a weakdef during processing |
| 788 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. |
| 789 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ |
| 790 | dir->ref_dynamic |= ind->ref_dynamic; |
| 791 | dir->ref_regular |= ind->ref_regular; |
| 792 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; |
| 793 | dir->needs_plt |= ind->needs_plt; |
| 794 | dir->pointer_equality_needed |= ind->pointer_equality_needed; |
| 795 | } |
| 796 | else |
| 797 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); |
| 798 | } |
| 799 | |
| 800 | static bfd_boolean |
| 801 | elf64_x86_64_elf_object_p (bfd *abfd) |
| 802 | { |
| 803 | /* Set the right machine number for an x86-64 elf64 file. */ |
| 804 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); |
| 805 | return TRUE; |
| 806 | } |
| 807 | |
| 808 | typedef union |
| 809 | { |
| 810 | unsigned char c[2]; |
| 811 | uint16_t i; |
| 812 | } |
| 813 | x86_64_opcode16; |
| 814 | |
| 815 | typedef union |
| 816 | { |
| 817 | unsigned char c[4]; |
| 818 | uint32_t i; |
| 819 | } |
| 820 | x86_64_opcode32; |
| 821 | |
| 822 | /* Return TRUE if the TLS access code sequence support transition |
| 823 | from R_TYPE. */ |
| 824 | |
| 825 | static bfd_boolean |
| 826 | elf_x86_64_check_tls_transition (bfd *abfd, |
| 827 | struct bfd_link_info *info, |
| 828 | asection *sec, |
| 829 | bfd_byte *contents, |
| 830 | Elf_Internal_Shdr *symtab_hdr, |
| 831 | struct elf_link_hash_entry **sym_hashes, |
| 832 | unsigned int r_type, |
| 833 | const Elf_Internal_Rela *rel, |
| 834 | const Elf_Internal_Rela *relend) |
| 835 | { |
| 836 | unsigned int val; |
| 837 | unsigned long r_symndx; |
| 838 | struct elf_link_hash_entry *h; |
| 839 | bfd_vma offset; |
| 840 | struct elf_x86_64_link_hash_table *htab; |
| 841 | |
| 842 | /* Get the section contents. */ |
| 843 | if (contents == NULL) |
| 844 | { |
| 845 | if (elf_section_data (sec)->this_hdr.contents != NULL) |
| 846 | contents = elf_section_data (sec)->this_hdr.contents; |
| 847 | else |
| 848 | { |
| 849 | /* FIXME: How to better handle error condition? */ |
| 850 | if (!bfd_malloc_and_get_section (abfd, sec, &contents)) |
| 851 | return FALSE; |
| 852 | |
| 853 | /* Cache the section contents for elf_link_input_bfd. */ |
| 854 | elf_section_data (sec)->this_hdr.contents = contents; |
| 855 | } |
| 856 | } |
| 857 | |
| 858 | htab = elf_x86_64_hash_table (info); |
| 859 | offset = rel->r_offset; |
| 860 | switch (r_type) |
| 861 | { |
| 862 | case R_X86_64_TLSGD: |
| 863 | case R_X86_64_TLSLD: |
| 864 | if ((rel + 1) >= relend) |
| 865 | return FALSE; |
| 866 | |
| 867 | if (r_type == R_X86_64_TLSGD) |
| 868 | { |
| 869 | /* Check transition from GD access model. For 64bit, only |
| 870 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 871 | .word 0x6666; rex64; call __tls_get_addr |
| 872 | can transit to different access model. For 32bit, only |
| 873 | leaq foo@tlsgd(%rip), %rdi |
| 874 | .word 0x6666; rex64; call __tls_get_addr |
| 875 | can transit to different access model. */ |
| 876 | |
| 877 | static x86_64_opcode32 call = { { 0x66, 0x66, 0x48, 0xe8 } }; |
| 878 | if ((offset + 12) > sec->size |
| 879 | || bfd_get_32 (abfd, contents + offset + 4) != call.i) |
| 880 | return FALSE; |
| 881 | |
| 882 | if (ABI_64_P (abfd)) |
| 883 | { |
| 884 | static x86_64_opcode32 leaq = { { 0x66, 0x48, 0x8d, 0x3d } }; |
| 885 | if (offset < 4 |
| 886 | || bfd_get_32 (abfd, contents + offset - 4) != leaq.i) |
| 887 | return FALSE; |
| 888 | } |
| 889 | else |
| 890 | { |
| 891 | static x86_64_opcode16 lea = { { 0x8d, 0x3d } }; |
| 892 | if (offset < 3 |
| 893 | || bfd_get_8 (abfd, contents + offset - 3) != 0x48 |
| 894 | || bfd_get_16 (abfd, contents + offset - 2) != lea.i) |
| 895 | return FALSE; |
| 896 | } |
| 897 | } |
| 898 | else |
| 899 | { |
| 900 | /* Check transition from LD access model. Only |
| 901 | leaq foo@tlsld(%rip), %rdi; |
| 902 | call __tls_get_addr |
| 903 | can transit to different access model. */ |
| 904 | |
| 905 | static x86_64_opcode32 ld = { { 0x48, 0x8d, 0x3d, 0xe8 } }; |
| 906 | x86_64_opcode32 op; |
| 907 | |
| 908 | if (offset < 3 || (offset + 9) > sec->size) |
| 909 | return FALSE; |
| 910 | |
| 911 | op.i = bfd_get_32 (abfd, contents + offset - 3); |
| 912 | op.c[3] = bfd_get_8 (abfd, contents + offset + 4); |
| 913 | if (op.i != ld.i) |
| 914 | return FALSE; |
| 915 | } |
| 916 | |
| 917 | r_symndx = htab->r_sym (rel[1].r_info); |
| 918 | if (r_symndx < symtab_hdr->sh_info) |
| 919 | return FALSE; |
| 920 | |
| 921 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 922 | /* Use strncmp to check __tls_get_addr since __tls_get_addr |
| 923 | may be versioned. */ |
| 924 | return (h != NULL |
| 925 | && h->root.root.string != NULL |
| 926 | && (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32 |
| 927 | || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32) |
| 928 | && (strncmp (h->root.root.string, |
| 929 | "__tls_get_addr", 14) == 0)); |
| 930 | |
| 931 | case R_X86_64_GOTTPOFF: |
| 932 | /* Check transition from IE access model: |
| 933 | mov foo@gottpoff(%rip), %reg |
| 934 | add foo@gottpoff(%rip), %reg |
| 935 | */ |
| 936 | |
| 937 | /* Check REX prefix first. */ |
| 938 | if (offset >= 3 && (offset + 4) <= sec->size) |
| 939 | { |
| 940 | val = bfd_get_8 (abfd, contents + offset - 3); |
| 941 | if (val != 0x48 && val != 0x4c) |
| 942 | { |
| 943 | /* X32 may have 0x44 REX prefix or no REX prefix. */ |
| 944 | if (ABI_64_P (abfd)) |
| 945 | return FALSE; |
| 946 | } |
| 947 | } |
| 948 | else |
| 949 | { |
| 950 | /* X32 may not have any REX prefix. */ |
| 951 | if (ABI_64_P (abfd)) |
| 952 | return FALSE; |
| 953 | if (offset < 2 || (offset + 3) > sec->size) |
| 954 | return FALSE; |
| 955 | } |
| 956 | |
| 957 | val = bfd_get_8 (abfd, contents + offset - 2); |
| 958 | if (val != 0x8b && val != 0x03) |
| 959 | return FALSE; |
| 960 | |
| 961 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 962 | return (val & 0xc7) == 5; |
| 963 | |
| 964 | case R_X86_64_GOTPC32_TLSDESC: |
| 965 | /* Check transition from GDesc access model: |
| 966 | leaq x@tlsdesc(%rip), %rax |
| 967 | |
| 968 | Make sure it's a leaq adding rip to a 32-bit offset |
| 969 | into any register, although it's probably almost always |
| 970 | going to be rax. */ |
| 971 | |
| 972 | if (offset < 3 || (offset + 4) > sec->size) |
| 973 | return FALSE; |
| 974 | |
| 975 | val = bfd_get_8 (abfd, contents + offset - 3); |
| 976 | if ((val & 0xfb) != 0x48) |
| 977 | return FALSE; |
| 978 | |
| 979 | if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d) |
| 980 | return FALSE; |
| 981 | |
| 982 | val = bfd_get_8 (abfd, contents + offset - 1); |
| 983 | return (val & 0xc7) == 0x05; |
| 984 | |
| 985 | case R_X86_64_TLSDESC_CALL: |
| 986 | /* Check transition from GDesc access model: |
| 987 | call *x@tlsdesc(%rax) |
| 988 | */ |
| 989 | if (offset + 2 <= sec->size) |
| 990 | { |
| 991 | /* Make sure that it's a call *x@tlsdesc(%rax). */ |
| 992 | static x86_64_opcode16 call = { { 0xff, 0x10 } }; |
| 993 | return bfd_get_16 (abfd, contents + offset) == call.i; |
| 994 | } |
| 995 | |
| 996 | return FALSE; |
| 997 | |
| 998 | default: |
| 999 | abort (); |
| 1000 | } |
| 1001 | } |
| 1002 | |
| 1003 | /* Return TRUE if the TLS access transition is OK or no transition |
| 1004 | will be performed. Update R_TYPE if there is a transition. */ |
| 1005 | |
| 1006 | static bfd_boolean |
| 1007 | elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd, |
| 1008 | asection *sec, bfd_byte *contents, |
| 1009 | Elf_Internal_Shdr *symtab_hdr, |
| 1010 | struct elf_link_hash_entry **sym_hashes, |
| 1011 | unsigned int *r_type, int tls_type, |
| 1012 | const Elf_Internal_Rela *rel, |
| 1013 | const Elf_Internal_Rela *relend, |
| 1014 | struct elf_link_hash_entry *h, |
| 1015 | unsigned long r_symndx) |
| 1016 | { |
| 1017 | unsigned int from_type = *r_type; |
| 1018 | unsigned int to_type = from_type; |
| 1019 | bfd_boolean check = TRUE; |
| 1020 | |
| 1021 | /* Skip TLS transition for functions. */ |
| 1022 | if (h != NULL |
| 1023 | && (h->type == STT_FUNC |
| 1024 | || h->type == STT_GNU_IFUNC)) |
| 1025 | return TRUE; |
| 1026 | |
| 1027 | switch (from_type) |
| 1028 | { |
| 1029 | case R_X86_64_TLSGD: |
| 1030 | case R_X86_64_GOTPC32_TLSDESC: |
| 1031 | case R_X86_64_TLSDESC_CALL: |
| 1032 | case R_X86_64_GOTTPOFF: |
| 1033 | if (info->executable) |
| 1034 | { |
| 1035 | if (h == NULL) |
| 1036 | to_type = R_X86_64_TPOFF32; |
| 1037 | else |
| 1038 | to_type = R_X86_64_GOTTPOFF; |
| 1039 | } |
| 1040 | |
| 1041 | /* When we are called from elf_x86_64_relocate_section, |
| 1042 | CONTENTS isn't NULL and there may be additional transitions |
| 1043 | based on TLS_TYPE. */ |
| 1044 | if (contents != NULL) |
| 1045 | { |
| 1046 | unsigned int new_to_type = to_type; |
| 1047 | |
| 1048 | if (info->executable |
| 1049 | && h != NULL |
| 1050 | && h->dynindx == -1 |
| 1051 | && tls_type == GOT_TLS_IE) |
| 1052 | new_to_type = R_X86_64_TPOFF32; |
| 1053 | |
| 1054 | if (to_type == R_X86_64_TLSGD |
| 1055 | || to_type == R_X86_64_GOTPC32_TLSDESC |
| 1056 | || to_type == R_X86_64_TLSDESC_CALL) |
| 1057 | { |
| 1058 | if (tls_type == GOT_TLS_IE) |
| 1059 | new_to_type = R_X86_64_GOTTPOFF; |
| 1060 | } |
| 1061 | |
| 1062 | /* We checked the transition before when we were called from |
| 1063 | elf_x86_64_check_relocs. We only want to check the new |
| 1064 | transition which hasn't been checked before. */ |
| 1065 | check = new_to_type != to_type && from_type == to_type; |
| 1066 | to_type = new_to_type; |
| 1067 | } |
| 1068 | |
| 1069 | break; |
| 1070 | |
| 1071 | case R_X86_64_TLSLD: |
| 1072 | if (info->executable) |
| 1073 | to_type = R_X86_64_TPOFF32; |
| 1074 | break; |
| 1075 | |
| 1076 | default: |
| 1077 | return TRUE; |
| 1078 | } |
| 1079 | |
| 1080 | /* Return TRUE if there is no transition. */ |
| 1081 | if (from_type == to_type) |
| 1082 | return TRUE; |
| 1083 | |
| 1084 | /* Check if the transition can be performed. */ |
| 1085 | if (check |
| 1086 | && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents, |
| 1087 | symtab_hdr, sym_hashes, |
| 1088 | from_type, rel, relend)) |
| 1089 | { |
| 1090 | reloc_howto_type *from, *to; |
| 1091 | const char *name; |
| 1092 | |
| 1093 | from = elf_x86_64_rtype_to_howto (abfd, from_type); |
| 1094 | to = elf_x86_64_rtype_to_howto (abfd, to_type); |
| 1095 | |
| 1096 | if (h) |
| 1097 | name = h->root.root.string; |
| 1098 | else |
| 1099 | { |
| 1100 | struct elf_x86_64_link_hash_table *htab; |
| 1101 | |
| 1102 | htab = elf_x86_64_hash_table (info); |
| 1103 | if (htab == NULL) |
| 1104 | name = "*unknown*"; |
| 1105 | else |
| 1106 | { |
| 1107 | Elf_Internal_Sym *isym; |
| 1108 | |
| 1109 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1110 | abfd, r_symndx); |
| 1111 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); |
| 1112 | } |
| 1113 | } |
| 1114 | |
| 1115 | (*_bfd_error_handler) |
| 1116 | (_("%B: TLS transition from %s to %s against `%s' at 0x%lx " |
| 1117 | "in section `%A' failed"), |
| 1118 | abfd, sec, from->name, to->name, name, |
| 1119 | (unsigned long) rel->r_offset); |
| 1120 | bfd_set_error (bfd_error_bad_value); |
| 1121 | return FALSE; |
| 1122 | } |
| 1123 | |
| 1124 | *r_type = to_type; |
| 1125 | return TRUE; |
| 1126 | } |
| 1127 | |
| 1128 | /* Look through the relocs for a section during the first phase, and |
| 1129 | calculate needed space in the global offset table, procedure |
| 1130 | linkage table, and dynamic reloc sections. */ |
| 1131 | |
| 1132 | static bfd_boolean |
| 1133 | elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, |
| 1134 | asection *sec, |
| 1135 | const Elf_Internal_Rela *relocs) |
| 1136 | { |
| 1137 | struct elf_x86_64_link_hash_table *htab; |
| 1138 | Elf_Internal_Shdr *symtab_hdr; |
| 1139 | struct elf_link_hash_entry **sym_hashes; |
| 1140 | const Elf_Internal_Rela *rel; |
| 1141 | const Elf_Internal_Rela *rel_end; |
| 1142 | asection *sreloc; |
| 1143 | |
| 1144 | if (info->relocatable) |
| 1145 | return TRUE; |
| 1146 | |
| 1147 | BFD_ASSERT (is_x86_64_elf (abfd)); |
| 1148 | |
| 1149 | htab = elf_x86_64_hash_table (info); |
| 1150 | if (htab == NULL) |
| 1151 | return FALSE; |
| 1152 | |
| 1153 | symtab_hdr = &elf_symtab_hdr (abfd); |
| 1154 | sym_hashes = elf_sym_hashes (abfd); |
| 1155 | |
| 1156 | sreloc = NULL; |
| 1157 | |
| 1158 | rel_end = relocs + sec->reloc_count; |
| 1159 | for (rel = relocs; rel < rel_end; rel++) |
| 1160 | { |
| 1161 | unsigned int r_type; |
| 1162 | unsigned long r_symndx; |
| 1163 | struct elf_link_hash_entry *h; |
| 1164 | Elf_Internal_Sym *isym; |
| 1165 | const char *name; |
| 1166 | |
| 1167 | r_symndx = htab->r_sym (rel->r_info); |
| 1168 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1169 | |
| 1170 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 1171 | { |
| 1172 | (*_bfd_error_handler) (_("%B: bad symbol index: %d"), |
| 1173 | abfd, r_symndx); |
| 1174 | return FALSE; |
| 1175 | } |
| 1176 | |
| 1177 | if (r_symndx < symtab_hdr->sh_info) |
| 1178 | { |
| 1179 | /* A local symbol. */ |
| 1180 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1181 | abfd, r_symndx); |
| 1182 | if (isym == NULL) |
| 1183 | return FALSE; |
| 1184 | |
| 1185 | /* Check relocation against local STT_GNU_IFUNC symbol. */ |
| 1186 | if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) |
| 1187 | { |
| 1188 | h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, |
| 1189 | TRUE); |
| 1190 | if (h == NULL) |
| 1191 | return FALSE; |
| 1192 | |
| 1193 | /* Fake a STT_GNU_IFUNC symbol. */ |
| 1194 | h->type = STT_GNU_IFUNC; |
| 1195 | h->def_regular = 1; |
| 1196 | h->ref_regular = 1; |
| 1197 | h->forced_local = 1; |
| 1198 | h->root.type = bfd_link_hash_defined; |
| 1199 | } |
| 1200 | else |
| 1201 | h = NULL; |
| 1202 | } |
| 1203 | else |
| 1204 | { |
| 1205 | isym = NULL; |
| 1206 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1207 | while (h->root.type == bfd_link_hash_indirect |
| 1208 | || h->root.type == bfd_link_hash_warning) |
| 1209 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1210 | } |
| 1211 | |
| 1212 | /* Check invalid x32 relocations. */ |
| 1213 | if (!ABI_64_P (abfd)) |
| 1214 | switch (r_type) |
| 1215 | { |
| 1216 | default: |
| 1217 | break; |
| 1218 | |
| 1219 | case R_X86_64_64: |
| 1220 | case R_X86_64_DTPOFF64: |
| 1221 | case R_X86_64_TPOFF64: |
| 1222 | case R_X86_64_PC64: |
| 1223 | case R_X86_64_GOTOFF64: |
| 1224 | case R_X86_64_GOT64: |
| 1225 | case R_X86_64_GOTPCREL64: |
| 1226 | case R_X86_64_GOTPC64: |
| 1227 | case R_X86_64_GOTPLT64: |
| 1228 | case R_X86_64_PLTOFF64: |
| 1229 | { |
| 1230 | if (h) |
| 1231 | name = h->root.root.string; |
| 1232 | else |
| 1233 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, |
| 1234 | NULL); |
| 1235 | (*_bfd_error_handler) |
| 1236 | (_("%B: relocation %s against symbol `%s' isn't " |
| 1237 | "supported in x32 mode"), abfd, |
| 1238 | x86_64_elf_howto_table[r_type].name, name); |
| 1239 | bfd_set_error (bfd_error_bad_value); |
| 1240 | return FALSE; |
| 1241 | } |
| 1242 | break; |
| 1243 | } |
| 1244 | |
| 1245 | if (h != NULL) |
| 1246 | { |
| 1247 | /* Create the ifunc sections for static executables. If we |
| 1248 | never see an indirect function symbol nor we are building |
| 1249 | a static executable, those sections will be empty and |
| 1250 | won't appear in output. */ |
| 1251 | switch (r_type) |
| 1252 | { |
| 1253 | default: |
| 1254 | break; |
| 1255 | |
| 1256 | case R_X86_64_32S: |
| 1257 | case R_X86_64_32: |
| 1258 | case R_X86_64_64: |
| 1259 | case R_X86_64_PC32: |
| 1260 | case R_X86_64_PC64: |
| 1261 | case R_X86_64_PLT32: |
| 1262 | case R_X86_64_GOTPCREL: |
| 1263 | case R_X86_64_GOTPCREL64: |
| 1264 | if (!_bfd_elf_create_ifunc_sections (abfd, info)) |
| 1265 | return FALSE; |
| 1266 | break; |
| 1267 | } |
| 1268 | |
| 1269 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle |
| 1270 | it here if it is defined in a non-shared object. */ |
| 1271 | if (h->type == STT_GNU_IFUNC |
| 1272 | && h->def_regular) |
| 1273 | { |
| 1274 | /* It is referenced by a non-shared object. */ |
| 1275 | h->ref_regular = 1; |
| 1276 | h->needs_plt = 1; |
| 1277 | |
| 1278 | /* STT_GNU_IFUNC symbol must go through PLT. */ |
| 1279 | h->plt.refcount += 1; |
| 1280 | |
| 1281 | /* STT_GNU_IFUNC needs dynamic sections. */ |
| 1282 | if (htab->elf.dynobj == NULL) |
| 1283 | htab->elf.dynobj = abfd; |
| 1284 | |
| 1285 | switch (r_type) |
| 1286 | { |
| 1287 | default: |
| 1288 | if (h->root.root.string) |
| 1289 | name = h->root.root.string; |
| 1290 | else |
| 1291 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, |
| 1292 | NULL); |
| 1293 | (*_bfd_error_handler) |
| 1294 | (_("%B: relocation %s against STT_GNU_IFUNC " |
| 1295 | "symbol `%s' isn't handled by %s"), abfd, |
| 1296 | x86_64_elf_howto_table[r_type].name, |
| 1297 | name, __FUNCTION__); |
| 1298 | bfd_set_error (bfd_error_bad_value); |
| 1299 | return FALSE; |
| 1300 | |
| 1301 | case R_X86_64_32: |
| 1302 | if (ABI_64_P (abfd)) |
| 1303 | goto not_pointer; |
| 1304 | case R_X86_64_64: |
| 1305 | h->non_got_ref = 1; |
| 1306 | h->pointer_equality_needed = 1; |
| 1307 | if (info->shared) |
| 1308 | { |
| 1309 | /* We must copy these reloc types into the output |
| 1310 | file. Create a reloc section in dynobj and |
| 1311 | make room for this reloc. */ |
| 1312 | sreloc = _bfd_elf_create_ifunc_dyn_reloc |
| 1313 | (abfd, info, sec, sreloc, |
| 1314 | &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs); |
| 1315 | if (sreloc == NULL) |
| 1316 | return FALSE; |
| 1317 | } |
| 1318 | break; |
| 1319 | |
| 1320 | case R_X86_64_32S: |
| 1321 | case R_X86_64_PC32: |
| 1322 | case R_X86_64_PC64: |
| 1323 | not_pointer: |
| 1324 | h->non_got_ref = 1; |
| 1325 | if (r_type != R_X86_64_PC32 |
| 1326 | && r_type != R_X86_64_PC64) |
| 1327 | h->pointer_equality_needed = 1; |
| 1328 | break; |
| 1329 | |
| 1330 | case R_X86_64_PLT32: |
| 1331 | break; |
| 1332 | |
| 1333 | case R_X86_64_GOTPCREL: |
| 1334 | case R_X86_64_GOTPCREL64: |
| 1335 | h->got.refcount += 1; |
| 1336 | if (htab->elf.sgot == NULL |
| 1337 | && !_bfd_elf_create_got_section (htab->elf.dynobj, |
| 1338 | info)) |
| 1339 | return FALSE; |
| 1340 | break; |
| 1341 | } |
| 1342 | |
| 1343 | continue; |
| 1344 | } |
| 1345 | } |
| 1346 | |
| 1347 | if (! elf_x86_64_tls_transition (info, abfd, sec, NULL, |
| 1348 | symtab_hdr, sym_hashes, |
| 1349 | &r_type, GOT_UNKNOWN, |
| 1350 | rel, rel_end, h, r_symndx)) |
| 1351 | return FALSE; |
| 1352 | |
| 1353 | switch (r_type) |
| 1354 | { |
| 1355 | case R_X86_64_TLSLD: |
| 1356 | htab->tls_ld_got.refcount += 1; |
| 1357 | goto create_got; |
| 1358 | |
| 1359 | case R_X86_64_TPOFF32: |
| 1360 | if (!info->executable && ABI_64_P (abfd)) |
| 1361 | { |
| 1362 | if (h) |
| 1363 | name = h->root.root.string; |
| 1364 | else |
| 1365 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, |
| 1366 | NULL); |
| 1367 | (*_bfd_error_handler) |
| 1368 | (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), |
| 1369 | abfd, |
| 1370 | x86_64_elf_howto_table[r_type].name, name); |
| 1371 | bfd_set_error (bfd_error_bad_value); |
| 1372 | return FALSE; |
| 1373 | } |
| 1374 | break; |
| 1375 | |
| 1376 | case R_X86_64_GOTTPOFF: |
| 1377 | if (!info->executable) |
| 1378 | info->flags |= DF_STATIC_TLS; |
| 1379 | /* Fall through */ |
| 1380 | |
| 1381 | case R_X86_64_GOT32: |
| 1382 | case R_X86_64_GOTPCREL: |
| 1383 | case R_X86_64_TLSGD: |
| 1384 | case R_X86_64_GOT64: |
| 1385 | case R_X86_64_GOTPCREL64: |
| 1386 | case R_X86_64_GOTPLT64: |
| 1387 | case R_X86_64_GOTPC32_TLSDESC: |
| 1388 | case R_X86_64_TLSDESC_CALL: |
| 1389 | /* This symbol requires a global offset table entry. */ |
| 1390 | { |
| 1391 | int tls_type, old_tls_type; |
| 1392 | |
| 1393 | switch (r_type) |
| 1394 | { |
| 1395 | default: tls_type = GOT_NORMAL; break; |
| 1396 | case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break; |
| 1397 | case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break; |
| 1398 | case R_X86_64_GOTPC32_TLSDESC: |
| 1399 | case R_X86_64_TLSDESC_CALL: |
| 1400 | tls_type = GOT_TLS_GDESC; break; |
| 1401 | } |
| 1402 | |
| 1403 | if (h != NULL) |
| 1404 | { |
| 1405 | if (r_type == R_X86_64_GOTPLT64) |
| 1406 | { |
| 1407 | /* This relocation indicates that we also need |
| 1408 | a PLT entry, as this is a function. We don't need |
| 1409 | a PLT entry for local symbols. */ |
| 1410 | h->needs_plt = 1; |
| 1411 | h->plt.refcount += 1; |
| 1412 | } |
| 1413 | h->got.refcount += 1; |
| 1414 | old_tls_type = elf_x86_64_hash_entry (h)->tls_type; |
| 1415 | } |
| 1416 | else |
| 1417 | { |
| 1418 | bfd_signed_vma *local_got_refcounts; |
| 1419 | |
| 1420 | /* This is a global offset table entry for a local symbol. */ |
| 1421 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1422 | if (local_got_refcounts == NULL) |
| 1423 | { |
| 1424 | bfd_size_type size; |
| 1425 | |
| 1426 | size = symtab_hdr->sh_info; |
| 1427 | size *= sizeof (bfd_signed_vma) |
| 1428 | + sizeof (bfd_vma) + sizeof (char); |
| 1429 | local_got_refcounts = ((bfd_signed_vma *) |
| 1430 | bfd_zalloc (abfd, size)); |
| 1431 | if (local_got_refcounts == NULL) |
| 1432 | return FALSE; |
| 1433 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 1434 | elf_x86_64_local_tlsdesc_gotent (abfd) |
| 1435 | = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); |
| 1436 | elf_x86_64_local_got_tls_type (abfd) |
| 1437 | = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); |
| 1438 | } |
| 1439 | local_got_refcounts[r_symndx] += 1; |
| 1440 | old_tls_type |
| 1441 | = elf_x86_64_local_got_tls_type (abfd) [r_symndx]; |
| 1442 | } |
| 1443 | |
| 1444 | /* If a TLS symbol is accessed using IE at least once, |
| 1445 | there is no point to use dynamic model for it. */ |
| 1446 | if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN |
| 1447 | && (! GOT_TLS_GD_ANY_P (old_tls_type) |
| 1448 | || tls_type != GOT_TLS_IE)) |
| 1449 | { |
| 1450 | if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type)) |
| 1451 | tls_type = old_tls_type; |
| 1452 | else if (GOT_TLS_GD_ANY_P (old_tls_type) |
| 1453 | && GOT_TLS_GD_ANY_P (tls_type)) |
| 1454 | tls_type |= old_tls_type; |
| 1455 | else |
| 1456 | { |
| 1457 | if (h) |
| 1458 | name = h->root.root.string; |
| 1459 | else |
| 1460 | name = bfd_elf_sym_name (abfd, symtab_hdr, |
| 1461 | isym, NULL); |
| 1462 | (*_bfd_error_handler) |
| 1463 | (_("%B: '%s' accessed both as normal and thread local symbol"), |
| 1464 | abfd, name); |
| 1465 | return FALSE; |
| 1466 | } |
| 1467 | } |
| 1468 | |
| 1469 | if (old_tls_type != tls_type) |
| 1470 | { |
| 1471 | if (h != NULL) |
| 1472 | elf_x86_64_hash_entry (h)->tls_type = tls_type; |
| 1473 | else |
| 1474 | elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type; |
| 1475 | } |
| 1476 | } |
| 1477 | /* Fall through */ |
| 1478 | |
| 1479 | case R_X86_64_GOTOFF64: |
| 1480 | case R_X86_64_GOTPC32: |
| 1481 | case R_X86_64_GOTPC64: |
| 1482 | create_got: |
| 1483 | if (htab->elf.sgot == NULL) |
| 1484 | { |
| 1485 | if (htab->elf.dynobj == NULL) |
| 1486 | htab->elf.dynobj = abfd; |
| 1487 | if (!_bfd_elf_create_got_section (htab->elf.dynobj, |
| 1488 | info)) |
| 1489 | return FALSE; |
| 1490 | } |
| 1491 | break; |
| 1492 | |
| 1493 | case R_X86_64_PLT32: |
| 1494 | /* This symbol requires a procedure linkage table entry. We |
| 1495 | actually build the entry in adjust_dynamic_symbol, |
| 1496 | because this might be a case of linking PIC code which is |
| 1497 | never referenced by a dynamic object, in which case we |
| 1498 | don't need to generate a procedure linkage table entry |
| 1499 | after all. */ |
| 1500 | |
| 1501 | /* If this is a local symbol, we resolve it directly without |
| 1502 | creating a procedure linkage table entry. */ |
| 1503 | if (h == NULL) |
| 1504 | continue; |
| 1505 | |
| 1506 | h->needs_plt = 1; |
| 1507 | h->plt.refcount += 1; |
| 1508 | break; |
| 1509 | |
| 1510 | case R_X86_64_PLTOFF64: |
| 1511 | /* This tries to form the 'address' of a function relative |
| 1512 | to GOT. For global symbols we need a PLT entry. */ |
| 1513 | if (h != NULL) |
| 1514 | { |
| 1515 | h->needs_plt = 1; |
| 1516 | h->plt.refcount += 1; |
| 1517 | } |
| 1518 | goto create_got; |
| 1519 | |
| 1520 | case R_X86_64_32: |
| 1521 | if (!ABI_64_P (abfd)) |
| 1522 | goto pointer; |
| 1523 | case R_X86_64_8: |
| 1524 | case R_X86_64_16: |
| 1525 | case R_X86_64_32S: |
| 1526 | /* Let's help debug shared library creation. These relocs |
| 1527 | cannot be used in shared libs. Don't error out for |
| 1528 | sections we don't care about, such as debug sections or |
| 1529 | non-constant sections. */ |
| 1530 | if (info->shared |
| 1531 | && (sec->flags & SEC_ALLOC) != 0 |
| 1532 | && (sec->flags & SEC_READONLY) != 0) |
| 1533 | { |
| 1534 | if (h) |
| 1535 | name = h->root.root.string; |
| 1536 | else |
| 1537 | name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL); |
| 1538 | (*_bfd_error_handler) |
| 1539 | (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), |
| 1540 | abfd, x86_64_elf_howto_table[r_type].name, name); |
| 1541 | bfd_set_error (bfd_error_bad_value); |
| 1542 | return FALSE; |
| 1543 | } |
| 1544 | /* Fall through. */ |
| 1545 | |
| 1546 | case R_X86_64_PC8: |
| 1547 | case R_X86_64_PC16: |
| 1548 | case R_X86_64_PC32: |
| 1549 | case R_X86_64_PC64: |
| 1550 | case R_X86_64_64: |
| 1551 | pointer: |
| 1552 | if (h != NULL && info->executable) |
| 1553 | { |
| 1554 | /* If this reloc is in a read-only section, we might |
| 1555 | need a copy reloc. We can't check reliably at this |
| 1556 | stage whether the section is read-only, as input |
| 1557 | sections have not yet been mapped to output sections. |
| 1558 | Tentatively set the flag for now, and correct in |
| 1559 | adjust_dynamic_symbol. */ |
| 1560 | h->non_got_ref = 1; |
| 1561 | |
| 1562 | /* We may need a .plt entry if the function this reloc |
| 1563 | refers to is in a shared lib. */ |
| 1564 | h->plt.refcount += 1; |
| 1565 | if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64) |
| 1566 | h->pointer_equality_needed = 1; |
| 1567 | } |
| 1568 | |
| 1569 | /* If we are creating a shared library, and this is a reloc |
| 1570 | against a global symbol, or a non PC relative reloc |
| 1571 | against a local symbol, then we need to copy the reloc |
| 1572 | into the shared library. However, if we are linking with |
| 1573 | -Bsymbolic, we do not need to copy a reloc against a |
| 1574 | global symbol which is defined in an object we are |
| 1575 | including in the link (i.e., DEF_REGULAR is set). At |
| 1576 | this point we have not seen all the input files, so it is |
| 1577 | possible that DEF_REGULAR is not set now but will be set |
| 1578 | later (it is never cleared). In case of a weak definition, |
| 1579 | DEF_REGULAR may be cleared later by a strong definition in |
| 1580 | a shared library. We account for that possibility below by |
| 1581 | storing information in the relocs_copied field of the hash |
| 1582 | table entry. A similar situation occurs when creating |
| 1583 | shared libraries and symbol visibility changes render the |
| 1584 | symbol local. |
| 1585 | |
| 1586 | If on the other hand, we are creating an executable, we |
| 1587 | may need to keep relocations for symbols satisfied by a |
| 1588 | dynamic library if we manage to avoid copy relocs for the |
| 1589 | symbol. */ |
| 1590 | if ((info->shared |
| 1591 | && (sec->flags & SEC_ALLOC) != 0 |
| 1592 | && (! IS_X86_64_PCREL_TYPE (r_type) |
| 1593 | || (h != NULL |
| 1594 | && (! SYMBOLIC_BIND (info, h) |
| 1595 | || h->root.type == bfd_link_hash_defweak |
| 1596 | || !h->def_regular)))) |
| 1597 | || (ELIMINATE_COPY_RELOCS |
| 1598 | && !info->shared |
| 1599 | && (sec->flags & SEC_ALLOC) != 0 |
| 1600 | && h != NULL |
| 1601 | && (h->root.type == bfd_link_hash_defweak |
| 1602 | || !h->def_regular))) |
| 1603 | { |
| 1604 | struct elf_dyn_relocs *p; |
| 1605 | struct elf_dyn_relocs **head; |
| 1606 | |
| 1607 | /* We must copy these reloc types into the output file. |
| 1608 | Create a reloc section in dynobj and make room for |
| 1609 | this reloc. */ |
| 1610 | if (sreloc == NULL) |
| 1611 | { |
| 1612 | if (htab->elf.dynobj == NULL) |
| 1613 | htab->elf.dynobj = abfd; |
| 1614 | |
| 1615 | sreloc = _bfd_elf_make_dynamic_reloc_section |
| 1616 | (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2, |
| 1617 | abfd, /*rela?*/ TRUE); |
| 1618 | |
| 1619 | if (sreloc == NULL) |
| 1620 | return FALSE; |
| 1621 | } |
| 1622 | |
| 1623 | /* If this is a global symbol, we count the number of |
| 1624 | relocations we need for this symbol. */ |
| 1625 | if (h != NULL) |
| 1626 | { |
| 1627 | head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs; |
| 1628 | } |
| 1629 | else |
| 1630 | { |
| 1631 | /* Track dynamic relocs needed for local syms too. |
| 1632 | We really need local syms available to do this |
| 1633 | easily. Oh well. */ |
| 1634 | asection *s; |
| 1635 | void **vpp; |
| 1636 | |
| 1637 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1638 | abfd, r_symndx); |
| 1639 | if (isym == NULL) |
| 1640 | return FALSE; |
| 1641 | |
| 1642 | s = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| 1643 | if (s == NULL) |
| 1644 | s = sec; |
| 1645 | |
| 1646 | /* Beware of type punned pointers vs strict aliasing |
| 1647 | rules. */ |
| 1648 | vpp = &(elf_section_data (s)->local_dynrel); |
| 1649 | head = (struct elf_dyn_relocs **)vpp; |
| 1650 | } |
| 1651 | |
| 1652 | p = *head; |
| 1653 | if (p == NULL || p->sec != sec) |
| 1654 | { |
| 1655 | bfd_size_type amt = sizeof *p; |
| 1656 | |
| 1657 | p = ((struct elf_dyn_relocs *) |
| 1658 | bfd_alloc (htab->elf.dynobj, amt)); |
| 1659 | if (p == NULL) |
| 1660 | return FALSE; |
| 1661 | p->next = *head; |
| 1662 | *head = p; |
| 1663 | p->sec = sec; |
| 1664 | p->count = 0; |
| 1665 | p->pc_count = 0; |
| 1666 | } |
| 1667 | |
| 1668 | p->count += 1; |
| 1669 | if (IS_X86_64_PCREL_TYPE (r_type)) |
| 1670 | p->pc_count += 1; |
| 1671 | } |
| 1672 | break; |
| 1673 | |
| 1674 | /* This relocation describes the C++ object vtable hierarchy. |
| 1675 | Reconstruct it for later use during GC. */ |
| 1676 | case R_X86_64_GNU_VTINHERIT: |
| 1677 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 1678 | return FALSE; |
| 1679 | break; |
| 1680 | |
| 1681 | /* This relocation describes which C++ vtable entries are actually |
| 1682 | used. Record for later use during GC. */ |
| 1683 | case R_X86_64_GNU_VTENTRY: |
| 1684 | BFD_ASSERT (h != NULL); |
| 1685 | if (h != NULL |
| 1686 | && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 1687 | return FALSE; |
| 1688 | break; |
| 1689 | |
| 1690 | default: |
| 1691 | break; |
| 1692 | } |
| 1693 | } |
| 1694 | |
| 1695 | return TRUE; |
| 1696 | } |
| 1697 | |
| 1698 | /* Return the section that should be marked against GC for a given |
| 1699 | relocation. */ |
| 1700 | |
| 1701 | static asection * |
| 1702 | elf_x86_64_gc_mark_hook (asection *sec, |
| 1703 | struct bfd_link_info *info, |
| 1704 | Elf_Internal_Rela *rel, |
| 1705 | struct elf_link_hash_entry *h, |
| 1706 | Elf_Internal_Sym *sym) |
| 1707 | { |
| 1708 | if (h != NULL) |
| 1709 | switch (ELF32_R_TYPE (rel->r_info)) |
| 1710 | { |
| 1711 | case R_X86_64_GNU_VTINHERIT: |
| 1712 | case R_X86_64_GNU_VTENTRY: |
| 1713 | return NULL; |
| 1714 | } |
| 1715 | |
| 1716 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 1717 | } |
| 1718 | |
| 1719 | /* Update the got entry reference counts for the section being removed. */ |
| 1720 | |
| 1721 | static bfd_boolean |
| 1722 | elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, |
| 1723 | asection *sec, |
| 1724 | const Elf_Internal_Rela *relocs) |
| 1725 | { |
| 1726 | struct elf_x86_64_link_hash_table *htab; |
| 1727 | Elf_Internal_Shdr *symtab_hdr; |
| 1728 | struct elf_link_hash_entry **sym_hashes; |
| 1729 | bfd_signed_vma *local_got_refcounts; |
| 1730 | const Elf_Internal_Rela *rel, *relend; |
| 1731 | |
| 1732 | if (info->relocatable) |
| 1733 | return TRUE; |
| 1734 | |
| 1735 | htab = elf_x86_64_hash_table (info); |
| 1736 | if (htab == NULL) |
| 1737 | return FALSE; |
| 1738 | |
| 1739 | elf_section_data (sec)->local_dynrel = NULL; |
| 1740 | |
| 1741 | symtab_hdr = &elf_symtab_hdr (abfd); |
| 1742 | sym_hashes = elf_sym_hashes (abfd); |
| 1743 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1744 | |
| 1745 | htab = elf_x86_64_hash_table (info); |
| 1746 | relend = relocs + sec->reloc_count; |
| 1747 | for (rel = relocs; rel < relend; rel++) |
| 1748 | { |
| 1749 | unsigned long r_symndx; |
| 1750 | unsigned int r_type; |
| 1751 | struct elf_link_hash_entry *h = NULL; |
| 1752 | |
| 1753 | r_symndx = htab->r_sym (rel->r_info); |
| 1754 | if (r_symndx >= symtab_hdr->sh_info) |
| 1755 | { |
| 1756 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1757 | while (h->root.type == bfd_link_hash_indirect |
| 1758 | || h->root.type == bfd_link_hash_warning) |
| 1759 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1760 | } |
| 1761 | else |
| 1762 | { |
| 1763 | /* A local symbol. */ |
| 1764 | Elf_Internal_Sym *isym; |
| 1765 | |
| 1766 | isym = bfd_sym_from_r_symndx (&htab->sym_cache, |
| 1767 | abfd, r_symndx); |
| 1768 | |
| 1769 | /* Check relocation against local STT_GNU_IFUNC symbol. */ |
| 1770 | if (isym != NULL |
| 1771 | && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC) |
| 1772 | { |
| 1773 | h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE); |
| 1774 | if (h == NULL) |
| 1775 | abort (); |
| 1776 | } |
| 1777 | } |
| 1778 | |
| 1779 | if (h) |
| 1780 | { |
| 1781 | struct elf_x86_64_link_hash_entry *eh; |
| 1782 | struct elf_dyn_relocs **pp; |
| 1783 | struct elf_dyn_relocs *p; |
| 1784 | |
| 1785 | eh = (struct elf_x86_64_link_hash_entry *) h; |
| 1786 | |
| 1787 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| 1788 | if (p->sec == sec) |
| 1789 | { |
| 1790 | /* Everything must go for SEC. */ |
| 1791 | *pp = p->next; |
| 1792 | break; |
| 1793 | } |
| 1794 | } |
| 1795 | |
| 1796 | r_type = ELF32_R_TYPE (rel->r_info); |
| 1797 | if (! elf_x86_64_tls_transition (info, abfd, sec, NULL, |
| 1798 | symtab_hdr, sym_hashes, |
| 1799 | &r_type, GOT_UNKNOWN, |
| 1800 | rel, relend, h, r_symndx)) |
| 1801 | return FALSE; |
| 1802 | |
| 1803 | switch (r_type) |
| 1804 | { |
| 1805 | case R_X86_64_TLSLD: |
| 1806 | if (htab->tls_ld_got.refcount > 0) |
| 1807 | htab->tls_ld_got.refcount -= 1; |
| 1808 | break; |
| 1809 | |
| 1810 | case R_X86_64_TLSGD: |
| 1811 | case R_X86_64_GOTPC32_TLSDESC: |
| 1812 | case R_X86_64_TLSDESC_CALL: |
| 1813 | case R_X86_64_GOTTPOFF: |
| 1814 | case R_X86_64_GOT32: |
| 1815 | case R_X86_64_GOTPCREL: |
| 1816 | case R_X86_64_GOT64: |
| 1817 | case R_X86_64_GOTPCREL64: |
| 1818 | case R_X86_64_GOTPLT64: |
| 1819 | if (h != NULL) |
| 1820 | { |
| 1821 | if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0) |
| 1822 | h->plt.refcount -= 1; |
| 1823 | if (h->got.refcount > 0) |
| 1824 | h->got.refcount -= 1; |
| 1825 | if (h->type == STT_GNU_IFUNC) |
| 1826 | { |
| 1827 | if (h->plt.refcount > 0) |
| 1828 | h->plt.refcount -= 1; |
| 1829 | } |
| 1830 | } |
| 1831 | else if (local_got_refcounts != NULL) |
| 1832 | { |
| 1833 | if (local_got_refcounts[r_symndx] > 0) |
| 1834 | local_got_refcounts[r_symndx] -= 1; |
| 1835 | } |
| 1836 | break; |
| 1837 | |
| 1838 | case R_X86_64_8: |
| 1839 | case R_X86_64_16: |
| 1840 | case R_X86_64_32: |
| 1841 | case R_X86_64_64: |
| 1842 | case R_X86_64_32S: |
| 1843 | case R_X86_64_PC8: |
| 1844 | case R_X86_64_PC16: |
| 1845 | case R_X86_64_PC32: |
| 1846 | case R_X86_64_PC64: |
| 1847 | if (info->shared |
| 1848 | && (h == NULL || h->type != STT_GNU_IFUNC)) |
| 1849 | break; |
| 1850 | /* Fall thru */ |
| 1851 | |
| 1852 | case R_X86_64_PLT32: |
| 1853 | case R_X86_64_PLTOFF64: |
| 1854 | if (h != NULL) |
| 1855 | { |
| 1856 | if (h->plt.refcount > 0) |
| 1857 | h->plt.refcount -= 1; |
| 1858 | } |
| 1859 | break; |
| 1860 | |
| 1861 | default: |
| 1862 | break; |
| 1863 | } |
| 1864 | } |
| 1865 | |
| 1866 | return TRUE; |
| 1867 | } |
| 1868 | |
| 1869 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 1870 | regular object. The current definition is in some section of the |
| 1871 | dynamic object, but we're not including those sections. We have to |
| 1872 | change the definition to something the rest of the link can |
| 1873 | understand. */ |
| 1874 | |
| 1875 | static bfd_boolean |
| 1876 | elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info, |
| 1877 | struct elf_link_hash_entry *h) |
| 1878 | { |
| 1879 | struct elf_x86_64_link_hash_table *htab; |
| 1880 | asection *s; |
| 1881 | |
| 1882 | /* STT_GNU_IFUNC symbol must go through PLT. */ |
| 1883 | if (h->type == STT_GNU_IFUNC) |
| 1884 | { |
| 1885 | if (h->plt.refcount <= 0) |
| 1886 | { |
| 1887 | h->plt.offset = (bfd_vma) -1; |
| 1888 | h->needs_plt = 0; |
| 1889 | } |
| 1890 | return TRUE; |
| 1891 | } |
| 1892 | |
| 1893 | /* If this is a function, put it in the procedure linkage table. We |
| 1894 | will fill in the contents of the procedure linkage table later, |
| 1895 | when we know the address of the .got section. */ |
| 1896 | if (h->type == STT_FUNC |
| 1897 | || h->needs_plt) |
| 1898 | { |
| 1899 | if (h->plt.refcount <= 0 |
| 1900 | || SYMBOL_CALLS_LOCAL (info, h) |
| 1901 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 1902 | && h->root.type == bfd_link_hash_undefweak)) |
| 1903 | { |
| 1904 | /* This case can occur if we saw a PLT32 reloc in an input |
| 1905 | file, but the symbol was never referred to by a dynamic |
| 1906 | object, or if all references were garbage collected. In |
| 1907 | such a case, we don't actually need to build a procedure |
| 1908 | linkage table, and we can just do a PC32 reloc instead. */ |
| 1909 | h->plt.offset = (bfd_vma) -1; |
| 1910 | h->needs_plt = 0; |
| 1911 | } |
| 1912 | |
| 1913 | return TRUE; |
| 1914 | } |
| 1915 | else |
| 1916 | /* It's possible that we incorrectly decided a .plt reloc was |
| 1917 | needed for an R_X86_64_PC32 reloc to a non-function sym in |
| 1918 | check_relocs. We can't decide accurately between function and |
| 1919 | non-function syms in check-relocs; Objects loaded later in |
| 1920 | the link may change h->type. So fix it now. */ |
| 1921 | h->plt.offset = (bfd_vma) -1; |
| 1922 | |
| 1923 | /* If this is a weak symbol, and there is a real definition, the |
| 1924 | processor independent code will have arranged for us to see the |
| 1925 | real definition first, and we can just use the same value. */ |
| 1926 | if (h->u.weakdef != NULL) |
| 1927 | { |
| 1928 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined |
| 1929 | || h->u.weakdef->root.type == bfd_link_hash_defweak); |
| 1930 | h->root.u.def.section = h->u.weakdef->root.u.def.section; |
| 1931 | h->root.u.def.value = h->u.weakdef->root.u.def.value; |
| 1932 | if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) |
| 1933 | h->non_got_ref = h->u.weakdef->non_got_ref; |
| 1934 | return TRUE; |
| 1935 | } |
| 1936 | |
| 1937 | /* This is a reference to a symbol defined by a dynamic object which |
| 1938 | is not a function. */ |
| 1939 | |
| 1940 | /* If we are creating a shared library, we must presume that the |
| 1941 | only references to the symbol are via the global offset table. |
| 1942 | For such cases we need not do anything here; the relocations will |
| 1943 | be handled correctly by relocate_section. */ |
| 1944 | if (info->shared) |
| 1945 | return TRUE; |
| 1946 | |
| 1947 | /* If there are no references to this symbol that do not use the |
| 1948 | GOT, we don't need to generate a copy reloc. */ |
| 1949 | if (!h->non_got_ref) |
| 1950 | return TRUE; |
| 1951 | |
| 1952 | /* If -z nocopyreloc was given, we won't generate them either. */ |
| 1953 | if (info->nocopyreloc) |
| 1954 | { |
| 1955 | h->non_got_ref = 0; |
| 1956 | return TRUE; |
| 1957 | } |
| 1958 | |
| 1959 | if (ELIMINATE_COPY_RELOCS) |
| 1960 | { |
| 1961 | struct elf_x86_64_link_hash_entry * eh; |
| 1962 | struct elf_dyn_relocs *p; |
| 1963 | |
| 1964 | eh = (struct elf_x86_64_link_hash_entry *) h; |
| 1965 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1966 | { |
| 1967 | s = p->sec->output_section; |
| 1968 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1969 | break; |
| 1970 | } |
| 1971 | |
| 1972 | /* If we didn't find any dynamic relocs in read-only sections, then |
| 1973 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
| 1974 | if (p == NULL) |
| 1975 | { |
| 1976 | h->non_got_ref = 0; |
| 1977 | return TRUE; |
| 1978 | } |
| 1979 | } |
| 1980 | |
| 1981 | if (h->size == 0) |
| 1982 | { |
| 1983 | (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), |
| 1984 | h->root.root.string); |
| 1985 | return TRUE; |
| 1986 | } |
| 1987 | |
| 1988 | /* We must allocate the symbol in our .dynbss section, which will |
| 1989 | become part of the .bss section of the executable. There will be |
| 1990 | an entry for this symbol in the .dynsym section. The dynamic |
| 1991 | object will contain position independent code, so all references |
| 1992 | from the dynamic object to this symbol will go through the global |
| 1993 | offset table. The dynamic linker will use the .dynsym entry to |
| 1994 | determine the address it must put in the global offset table, so |
| 1995 | both the dynamic object and the regular object will refer to the |
| 1996 | same memory location for the variable. */ |
| 1997 | |
| 1998 | htab = elf_x86_64_hash_table (info); |
| 1999 | if (htab == NULL) |
| 2000 | return FALSE; |
| 2001 | |
| 2002 | /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker |
| 2003 | to copy the initial value out of the dynamic object and into the |
| 2004 | runtime process image. */ |
| 2005 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 2006 | { |
| 2007 | const struct elf_backend_data *bed; |
| 2008 | bed = get_elf_backend_data (info->output_bfd); |
| 2009 | htab->srelbss->size += bed->s->sizeof_rela; |
| 2010 | h->needs_copy = 1; |
| 2011 | } |
| 2012 | |
| 2013 | s = htab->sdynbss; |
| 2014 | |
| 2015 | return _bfd_elf_adjust_dynamic_copy (h, s); |
| 2016 | } |
| 2017 | |
| 2018 | /* Allocate space in .plt, .got and associated reloc sections for |
| 2019 | dynamic relocs. */ |
| 2020 | |
| 2021 | static bfd_boolean |
| 2022 | elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) |
| 2023 | { |
| 2024 | struct bfd_link_info *info; |
| 2025 | struct elf_x86_64_link_hash_table *htab; |
| 2026 | struct elf_x86_64_link_hash_entry *eh; |
| 2027 | struct elf_dyn_relocs *p; |
| 2028 | const struct elf_backend_data *bed; |
| 2029 | |
| 2030 | if (h->root.type == bfd_link_hash_indirect) |
| 2031 | return TRUE; |
| 2032 | |
| 2033 | if (h->root.type == bfd_link_hash_warning) |
| 2034 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2035 | eh = (struct elf_x86_64_link_hash_entry *) h; |
| 2036 | |
| 2037 | info = (struct bfd_link_info *) inf; |
| 2038 | htab = elf_x86_64_hash_table (info); |
| 2039 | if (htab == NULL) |
| 2040 | return FALSE; |
| 2041 | bed = get_elf_backend_data (info->output_bfd); |
| 2042 | |
| 2043 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it |
| 2044 | here if it is defined and referenced in a non-shared object. */ |
| 2045 | if (h->type == STT_GNU_IFUNC |
| 2046 | && h->def_regular) |
| 2047 | return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, |
| 2048 | &eh->dyn_relocs, |
| 2049 | PLT_ENTRY_SIZE, |
| 2050 | GOT_ENTRY_SIZE); |
| 2051 | else if (htab->elf.dynamic_sections_created |
| 2052 | && h->plt.refcount > 0) |
| 2053 | { |
| 2054 | /* Make sure this symbol is output as a dynamic symbol. |
| 2055 | Undefined weak syms won't yet be marked as dynamic. */ |
| 2056 | if (h->dynindx == -1 |
| 2057 | && !h->forced_local) |
| 2058 | { |
| 2059 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2060 | return FALSE; |
| 2061 | } |
| 2062 | |
| 2063 | if (info->shared |
| 2064 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) |
| 2065 | { |
| 2066 | asection *s = htab->elf.splt; |
| 2067 | |
| 2068 | /* If this is the first .plt entry, make room for the special |
| 2069 | first entry. */ |
| 2070 | if (s->size == 0) |
| 2071 | s->size += PLT_ENTRY_SIZE; |
| 2072 | |
| 2073 | h->plt.offset = s->size; |
| 2074 | |
| 2075 | /* If this symbol is not defined in a regular file, and we are |
| 2076 | not generating a shared library, then set the symbol to this |
| 2077 | location in the .plt. This is required to make function |
| 2078 | pointers compare as equal between the normal executable and |
| 2079 | the shared library. */ |
| 2080 | if (! info->shared |
| 2081 | && !h->def_regular) |
| 2082 | { |
| 2083 | h->root.u.def.section = s; |
| 2084 | h->root.u.def.value = h->plt.offset; |
| 2085 | } |
| 2086 | |
| 2087 | /* Make room for this entry. */ |
| 2088 | s->size += PLT_ENTRY_SIZE; |
| 2089 | |
| 2090 | /* We also need to make an entry in the .got.plt section, which |
| 2091 | will be placed in the .got section by the linker script. */ |
| 2092 | htab->elf.sgotplt->size += GOT_ENTRY_SIZE; |
| 2093 | |
| 2094 | /* We also need to make an entry in the .rela.plt section. */ |
| 2095 | htab->elf.srelplt->size += bed->s->sizeof_rela; |
| 2096 | htab->elf.srelplt->reloc_count++; |
| 2097 | } |
| 2098 | else |
| 2099 | { |
| 2100 | h->plt.offset = (bfd_vma) -1; |
| 2101 | h->needs_plt = 0; |
| 2102 | } |
| 2103 | } |
| 2104 | else |
| 2105 | { |
| 2106 | h->plt.offset = (bfd_vma) -1; |
| 2107 | h->needs_plt = 0; |
| 2108 | } |
| 2109 | |
| 2110 | eh->tlsdesc_got = (bfd_vma) -1; |
| 2111 | |
| 2112 | /* If R_X86_64_GOTTPOFF symbol is now local to the binary, |
| 2113 | make it a R_X86_64_TPOFF32 requiring no GOT entry. */ |
| 2114 | if (h->got.refcount > 0 |
| 2115 | && info->executable |
| 2116 | && h->dynindx == -1 |
| 2117 | && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE) |
| 2118 | { |
| 2119 | h->got.offset = (bfd_vma) -1; |
| 2120 | } |
| 2121 | else if (h->got.refcount > 0) |
| 2122 | { |
| 2123 | asection *s; |
| 2124 | bfd_boolean dyn; |
| 2125 | int tls_type = elf_x86_64_hash_entry (h)->tls_type; |
| 2126 | |
| 2127 | /* Make sure this symbol is output as a dynamic symbol. |
| 2128 | Undefined weak syms won't yet be marked as dynamic. */ |
| 2129 | if (h->dynindx == -1 |
| 2130 | && !h->forced_local) |
| 2131 | { |
| 2132 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2133 | return FALSE; |
| 2134 | } |
| 2135 | |
| 2136 | if (GOT_TLS_GDESC_P (tls_type)) |
| 2137 | { |
| 2138 | eh->tlsdesc_got = htab->elf.sgotplt->size |
| 2139 | - elf_x86_64_compute_jump_table_size (htab); |
| 2140 | htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE; |
| 2141 | h->got.offset = (bfd_vma) -2; |
| 2142 | } |
| 2143 | if (! GOT_TLS_GDESC_P (tls_type) |
| 2144 | || GOT_TLS_GD_P (tls_type)) |
| 2145 | { |
| 2146 | s = htab->elf.sgot; |
| 2147 | h->got.offset = s->size; |
| 2148 | s->size += GOT_ENTRY_SIZE; |
| 2149 | if (GOT_TLS_GD_P (tls_type)) |
| 2150 | s->size += GOT_ENTRY_SIZE; |
| 2151 | } |
| 2152 | dyn = htab->elf.dynamic_sections_created; |
| 2153 | /* R_X86_64_TLSGD needs one dynamic relocation if local symbol |
| 2154 | and two if global. |
| 2155 | R_X86_64_GOTTPOFF needs one dynamic relocation. */ |
| 2156 | if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) |
| 2157 | || tls_type == GOT_TLS_IE) |
| 2158 | htab->elf.srelgot->size += bed->s->sizeof_rela; |
| 2159 | else if (GOT_TLS_GD_P (tls_type)) |
| 2160 | htab->elf.srelgot->size += 2 * bed->s->sizeof_rela; |
| 2161 | else if (! GOT_TLS_GDESC_P (tls_type) |
| 2162 | && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2163 | || h->root.type != bfd_link_hash_undefweak) |
| 2164 | && (info->shared |
| 2165 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) |
| 2166 | htab->elf.srelgot->size += bed->s->sizeof_rela; |
| 2167 | if (GOT_TLS_GDESC_P (tls_type)) |
| 2168 | { |
| 2169 | htab->elf.srelplt->size += bed->s->sizeof_rela; |
| 2170 | htab->tlsdesc_plt = (bfd_vma) -1; |
| 2171 | } |
| 2172 | } |
| 2173 | else |
| 2174 | h->got.offset = (bfd_vma) -1; |
| 2175 | |
| 2176 | if (eh->dyn_relocs == NULL) |
| 2177 | return TRUE; |
| 2178 | |
| 2179 | /* In the shared -Bsymbolic case, discard space allocated for |
| 2180 | dynamic pc-relative relocs against symbols which turn out to be |
| 2181 | defined in regular objects. For the normal shared case, discard |
| 2182 | space for pc-relative relocs that have become local due to symbol |
| 2183 | visibility changes. */ |
| 2184 | |
| 2185 | if (info->shared) |
| 2186 | { |
| 2187 | /* Relocs that use pc_count are those that appear on a call |
| 2188 | insn, or certain REL relocs that can generated via assembly. |
| 2189 | We want calls to protected symbols to resolve directly to the |
| 2190 | function rather than going via the plt. If people want |
| 2191 | function pointer comparisons to work as expected then they |
| 2192 | should avoid writing weird assembly. */ |
| 2193 | if (SYMBOL_CALLS_LOCAL (info, h)) |
| 2194 | { |
| 2195 | struct elf_dyn_relocs **pp; |
| 2196 | |
| 2197 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 2198 | { |
| 2199 | p->count -= p->pc_count; |
| 2200 | p->pc_count = 0; |
| 2201 | if (p->count == 0) |
| 2202 | *pp = p->next; |
| 2203 | else |
| 2204 | pp = &p->next; |
| 2205 | } |
| 2206 | } |
| 2207 | |
| 2208 | /* Also discard relocs on undefined weak syms with non-default |
| 2209 | visibility. */ |
| 2210 | if (eh->dyn_relocs != NULL |
| 2211 | && h->root.type == bfd_link_hash_undefweak) |
| 2212 | { |
| 2213 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 2214 | eh->dyn_relocs = NULL; |
| 2215 | |
| 2216 | /* Make sure undefined weak symbols are output as a dynamic |
| 2217 | symbol in PIEs. */ |
| 2218 | else if (h->dynindx == -1 |
| 2219 | && ! h->forced_local |
| 2220 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2221 | return FALSE; |
| 2222 | } |
| 2223 | |
| 2224 | } |
| 2225 | else if (ELIMINATE_COPY_RELOCS) |
| 2226 | { |
| 2227 | /* For the non-shared case, discard space for relocs against |
| 2228 | symbols which turn out to need copy relocs or are not |
| 2229 | dynamic. */ |
| 2230 | |
| 2231 | if (!h->non_got_ref |
| 2232 | && ((h->def_dynamic |
| 2233 | && !h->def_regular) |
| 2234 | || (htab->elf.dynamic_sections_created |
| 2235 | && (h->root.type == bfd_link_hash_undefweak |
| 2236 | || h->root.type == bfd_link_hash_undefined)))) |
| 2237 | { |
| 2238 | /* Make sure this symbol is output as a dynamic symbol. |
| 2239 | Undefined weak syms won't yet be marked as dynamic. */ |
| 2240 | if (h->dynindx == -1 |
| 2241 | && ! h->forced_local |
| 2242 | && ! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 2243 | return FALSE; |
| 2244 | |
| 2245 | /* If that succeeded, we know we'll be keeping all the |
| 2246 | relocs. */ |
| 2247 | if (h->dynindx != -1) |
| 2248 | goto keep; |
| 2249 | } |
| 2250 | |
| 2251 | eh->dyn_relocs = NULL; |
| 2252 | |
| 2253 | keep: ; |
| 2254 | } |
| 2255 | |
| 2256 | /* Finally, allocate space. */ |
| 2257 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 2258 | { |
| 2259 | asection * sreloc; |
| 2260 | |
| 2261 | sreloc = elf_section_data (p->sec)->sreloc; |
| 2262 | |
| 2263 | BFD_ASSERT (sreloc != NULL); |
| 2264 | |
| 2265 | sreloc->size += p->count * bed->s->sizeof_rela; |
| 2266 | } |
| 2267 | |
| 2268 | return TRUE; |
| 2269 | } |
| 2270 | |
| 2271 | /* Allocate space in .plt, .got and associated reloc sections for |
| 2272 | local dynamic relocs. */ |
| 2273 | |
| 2274 | static bfd_boolean |
| 2275 | elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf) |
| 2276 | { |
| 2277 | struct elf_link_hash_entry *h |
| 2278 | = (struct elf_link_hash_entry *) *slot; |
| 2279 | |
| 2280 | if (h->type != STT_GNU_IFUNC |
| 2281 | || !h->def_regular |
| 2282 | || !h->ref_regular |
| 2283 | || !h->forced_local |
| 2284 | || h->root.type != bfd_link_hash_defined) |
| 2285 | abort (); |
| 2286 | |
| 2287 | return elf_x86_64_allocate_dynrelocs (h, inf); |
| 2288 | } |
| 2289 | |
| 2290 | /* Find any dynamic relocs that apply to read-only sections. */ |
| 2291 | |
| 2292 | static bfd_boolean |
| 2293 | elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h, |
| 2294 | void * inf) |
| 2295 | { |
| 2296 | struct elf_x86_64_link_hash_entry *eh; |
| 2297 | struct elf_dyn_relocs *p; |
| 2298 | |
| 2299 | if (h->root.type == bfd_link_hash_warning) |
| 2300 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 2301 | |
| 2302 | /* Skip local IFUNC symbols. */ |
| 2303 | if (h->forced_local && h->type == STT_GNU_IFUNC) |
| 2304 | return TRUE; |
| 2305 | |
| 2306 | eh = (struct elf_x86_64_link_hash_entry *) h; |
| 2307 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 2308 | { |
| 2309 | asection *s = p->sec->output_section; |
| 2310 | |
| 2311 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 2312 | { |
| 2313 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 2314 | |
| 2315 | info->flags |= DF_TEXTREL; |
| 2316 | |
| 2317 | /* Not an error, just cut short the traversal. */ |
| 2318 | return FALSE; |
| 2319 | } |
| 2320 | } |
| 2321 | return TRUE; |
| 2322 | } |
| 2323 | |
| 2324 | /* Set the sizes of the dynamic sections. */ |
| 2325 | |
| 2326 | static bfd_boolean |
| 2327 | elf_x86_64_size_dynamic_sections (bfd *output_bfd, |
| 2328 | struct bfd_link_info *info) |
| 2329 | { |
| 2330 | struct elf_x86_64_link_hash_table *htab; |
| 2331 | bfd *dynobj; |
| 2332 | asection *s; |
| 2333 | bfd_boolean relocs; |
| 2334 | bfd *ibfd; |
| 2335 | const struct elf_backend_data *bed; |
| 2336 | |
| 2337 | htab = elf_x86_64_hash_table (info); |
| 2338 | if (htab == NULL) |
| 2339 | return FALSE; |
| 2340 | bed = get_elf_backend_data (output_bfd); |
| 2341 | |
| 2342 | dynobj = htab->elf.dynobj; |
| 2343 | if (dynobj == NULL) |
| 2344 | abort (); |
| 2345 | |
| 2346 | if (htab->elf.dynamic_sections_created) |
| 2347 | { |
| 2348 | /* Set the contents of the .interp section to the interpreter. */ |
| 2349 | if (info->executable) |
| 2350 | { |
| 2351 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 2352 | if (s == NULL) |
| 2353 | abort (); |
| 2354 | s->size = htab->dynamic_interpreter_size; |
| 2355 | s->contents = (unsigned char *) htab->dynamic_interpreter; |
| 2356 | } |
| 2357 | } |
| 2358 | |
| 2359 | /* Set up .got offsets for local syms, and space for local dynamic |
| 2360 | relocs. */ |
| 2361 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 2362 | { |
| 2363 | bfd_signed_vma *local_got; |
| 2364 | bfd_signed_vma *end_local_got; |
| 2365 | char *local_tls_type; |
| 2366 | bfd_vma *local_tlsdesc_gotent; |
| 2367 | bfd_size_type locsymcount; |
| 2368 | Elf_Internal_Shdr *symtab_hdr; |
| 2369 | asection *srel; |
| 2370 | |
| 2371 | if (! is_x86_64_elf (ibfd)) |
| 2372 | continue; |
| 2373 | |
| 2374 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 2375 | { |
| 2376 | struct elf_dyn_relocs *p; |
| 2377 | |
| 2378 | for (p = (struct elf_dyn_relocs *) |
| 2379 | (elf_section_data (s)->local_dynrel); |
| 2380 | p != NULL; |
| 2381 | p = p->next) |
| 2382 | { |
| 2383 | if (!bfd_is_abs_section (p->sec) |
| 2384 | && bfd_is_abs_section (p->sec->output_section)) |
| 2385 | { |
| 2386 | /* Input section has been discarded, either because |
| 2387 | it is a copy of a linkonce section or due to |
| 2388 | linker script /DISCARD/, so we'll be discarding |
| 2389 | the relocs too. */ |
| 2390 | } |
| 2391 | else if (p->count != 0) |
| 2392 | { |
| 2393 | srel = elf_section_data (p->sec)->sreloc; |
| 2394 | srel->size += p->count * bed->s->sizeof_rela; |
| 2395 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) |
| 2396 | info->flags |= DF_TEXTREL; |
| 2397 | } |
| 2398 | } |
| 2399 | } |
| 2400 | |
| 2401 | local_got = elf_local_got_refcounts (ibfd); |
| 2402 | if (!local_got) |
| 2403 | continue; |
| 2404 | |
| 2405 | symtab_hdr = &elf_symtab_hdr (ibfd); |
| 2406 | locsymcount = symtab_hdr->sh_info; |
| 2407 | end_local_got = local_got + locsymcount; |
| 2408 | local_tls_type = elf_x86_64_local_got_tls_type (ibfd); |
| 2409 | local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd); |
| 2410 | s = htab->elf.sgot; |
| 2411 | srel = htab->elf.srelgot; |
| 2412 | for (; local_got < end_local_got; |
| 2413 | ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) |
| 2414 | { |
| 2415 | *local_tlsdesc_gotent = (bfd_vma) -1; |
| 2416 | if (*local_got > 0) |
| 2417 | { |
| 2418 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 2419 | { |
| 2420 | *local_tlsdesc_gotent = htab->elf.sgotplt->size |
| 2421 | - elf_x86_64_compute_jump_table_size (htab); |
| 2422 | htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE; |
| 2423 | *local_got = (bfd_vma) -2; |
| 2424 | } |
| 2425 | if (! GOT_TLS_GDESC_P (*local_tls_type) |
| 2426 | || GOT_TLS_GD_P (*local_tls_type)) |
| 2427 | { |
| 2428 | *local_got = s->size; |
| 2429 | s->size += GOT_ENTRY_SIZE; |
| 2430 | if (GOT_TLS_GD_P (*local_tls_type)) |
| 2431 | s->size += GOT_ENTRY_SIZE; |
| 2432 | } |
| 2433 | if (info->shared |
| 2434 | || GOT_TLS_GD_ANY_P (*local_tls_type) |
| 2435 | || *local_tls_type == GOT_TLS_IE) |
| 2436 | { |
| 2437 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 2438 | { |
| 2439 | htab->elf.srelplt->size |
| 2440 | += bed->s->sizeof_rela; |
| 2441 | htab->tlsdesc_plt = (bfd_vma) -1; |
| 2442 | } |
| 2443 | if (! GOT_TLS_GDESC_P (*local_tls_type) |
| 2444 | || GOT_TLS_GD_P (*local_tls_type)) |
| 2445 | srel->size += bed->s->sizeof_rela; |
| 2446 | } |
| 2447 | } |
| 2448 | else |
| 2449 | *local_got = (bfd_vma) -1; |
| 2450 | } |
| 2451 | } |
| 2452 | |
| 2453 | if (htab->tls_ld_got.refcount > 0) |
| 2454 | { |
| 2455 | /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD |
| 2456 | relocs. */ |
| 2457 | htab->tls_ld_got.offset = htab->elf.sgot->size; |
| 2458 | htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE; |
| 2459 | htab->elf.srelgot->size += bed->s->sizeof_rela; |
| 2460 | } |
| 2461 | else |
| 2462 | htab->tls_ld_got.offset = -1; |
| 2463 | |
| 2464 | /* Allocate global sym .plt and .got entries, and space for global |
| 2465 | sym dynamic relocs. */ |
| 2466 | elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs, |
| 2467 | info); |
| 2468 | |
| 2469 | /* Allocate .plt and .got entries, and space for local symbols. */ |
| 2470 | htab_traverse (htab->loc_hash_table, |
| 2471 | elf_x86_64_allocate_local_dynrelocs, |
| 2472 | info); |
| 2473 | |
| 2474 | /* For every jump slot reserved in the sgotplt, reloc_count is |
| 2475 | incremented. However, when we reserve space for TLS descriptors, |
| 2476 | it's not incremented, so in order to compute the space reserved |
| 2477 | for them, it suffices to multiply the reloc count by the jump |
| 2478 | slot size. */ |
| 2479 | if (htab->elf.srelplt) |
| 2480 | htab->sgotplt_jump_table_size |
| 2481 | = elf_x86_64_compute_jump_table_size (htab); |
| 2482 | |
| 2483 | if (htab->tlsdesc_plt) |
| 2484 | { |
| 2485 | /* If we're not using lazy TLS relocations, don't generate the |
| 2486 | PLT and GOT entries they require. */ |
| 2487 | if ((info->flags & DF_BIND_NOW)) |
| 2488 | htab->tlsdesc_plt = 0; |
| 2489 | else |
| 2490 | { |
| 2491 | htab->tlsdesc_got = htab->elf.sgot->size; |
| 2492 | htab->elf.sgot->size += GOT_ENTRY_SIZE; |
| 2493 | /* Reserve room for the initial entry. |
| 2494 | FIXME: we could probably do away with it in this case. */ |
| 2495 | if (htab->elf.splt->size == 0) |
| 2496 | htab->elf.splt->size += PLT_ENTRY_SIZE; |
| 2497 | htab->tlsdesc_plt = htab->elf.splt->size; |
| 2498 | htab->elf.splt->size += PLT_ENTRY_SIZE; |
| 2499 | } |
| 2500 | } |
| 2501 | |
| 2502 | if (htab->elf.sgotplt) |
| 2503 | { |
| 2504 | struct elf_link_hash_entry *got; |
| 2505 | got = elf_link_hash_lookup (elf_hash_table (info), |
| 2506 | "_GLOBAL_OFFSET_TABLE_", |
| 2507 | FALSE, FALSE, FALSE); |
| 2508 | |
| 2509 | /* Don't allocate .got.plt section if there are no GOT nor PLT |
| 2510 | entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */ |
| 2511 | if ((got == NULL |
| 2512 | || !got->ref_regular_nonweak) |
| 2513 | && (htab->elf.sgotplt->size |
| 2514 | == get_elf_backend_data (output_bfd)->got_header_size) |
| 2515 | && (htab->elf.splt == NULL |
| 2516 | || htab->elf.splt->size == 0) |
| 2517 | && (htab->elf.sgot == NULL |
| 2518 | || htab->elf.sgot->size == 0) |
| 2519 | && (htab->elf.iplt == NULL |
| 2520 | || htab->elf.iplt->size == 0) |
| 2521 | && (htab->elf.igotplt == NULL |
| 2522 | || htab->elf.igotplt->size == 0)) |
| 2523 | htab->elf.sgotplt->size = 0; |
| 2524 | } |
| 2525 | |
| 2526 | /* We now have determined the sizes of the various dynamic sections. |
| 2527 | Allocate memory for them. */ |
| 2528 | relocs = FALSE; |
| 2529 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 2530 | { |
| 2531 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 2532 | continue; |
| 2533 | |
| 2534 | if (s == htab->elf.splt |
| 2535 | || s == htab->elf.sgot |
| 2536 | || s == htab->elf.sgotplt |
| 2537 | || s == htab->elf.iplt |
| 2538 | || s == htab->elf.igotplt |
| 2539 | || s == htab->sdynbss) |
| 2540 | { |
| 2541 | /* Strip this section if we don't need it; see the |
| 2542 | comment below. */ |
| 2543 | } |
| 2544 | else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) |
| 2545 | { |
| 2546 | if (s->size != 0 && s != htab->elf.srelplt) |
| 2547 | relocs = TRUE; |
| 2548 | |
| 2549 | /* We use the reloc_count field as a counter if we need |
| 2550 | to copy relocs into the output file. */ |
| 2551 | if (s != htab->elf.srelplt) |
| 2552 | s->reloc_count = 0; |
| 2553 | } |
| 2554 | else |
| 2555 | { |
| 2556 | /* It's not one of our sections, so don't allocate space. */ |
| 2557 | continue; |
| 2558 | } |
| 2559 | |
| 2560 | if (s->size == 0) |
| 2561 | { |
| 2562 | /* If we don't need this section, strip it from the |
| 2563 | output file. This is mostly to handle .rela.bss and |
| 2564 | .rela.plt. We must create both sections in |
| 2565 | create_dynamic_sections, because they must be created |
| 2566 | before the linker maps input sections to output |
| 2567 | sections. The linker does that before |
| 2568 | adjust_dynamic_symbol is called, and it is that |
| 2569 | function which decides whether anything needs to go |
| 2570 | into these sections. */ |
| 2571 | |
| 2572 | s->flags |= SEC_EXCLUDE; |
| 2573 | continue; |
| 2574 | } |
| 2575 | |
| 2576 | if ((s->flags & SEC_HAS_CONTENTS) == 0) |
| 2577 | continue; |
| 2578 | |
| 2579 | /* Allocate memory for the section contents. We use bfd_zalloc |
| 2580 | here in case unused entries are not reclaimed before the |
| 2581 | section's contents are written out. This should not happen, |
| 2582 | but this way if it does, we get a R_X86_64_NONE reloc instead |
| 2583 | of garbage. */ |
| 2584 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); |
| 2585 | if (s->contents == NULL) |
| 2586 | return FALSE; |
| 2587 | } |
| 2588 | |
| 2589 | if (htab->elf.dynamic_sections_created) |
| 2590 | { |
| 2591 | /* Add some entries to the .dynamic section. We fill in the |
| 2592 | values later, in elf_x86_64_finish_dynamic_sections, but we |
| 2593 | must add the entries now so that we get the correct size for |
| 2594 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 2595 | dynamic linker and used by the debugger. */ |
| 2596 | #define add_dynamic_entry(TAG, VAL) \ |
| 2597 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| 2598 | |
| 2599 | if (info->executable) |
| 2600 | { |
| 2601 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 2602 | return FALSE; |
| 2603 | } |
| 2604 | |
| 2605 | if (htab->elf.splt->size != 0) |
| 2606 | { |
| 2607 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 2608 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 2609 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) |
| 2610 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 2611 | return FALSE; |
| 2612 | |
| 2613 | if (htab->tlsdesc_plt |
| 2614 | && (!add_dynamic_entry (DT_TLSDESC_PLT, 0) |
| 2615 | || !add_dynamic_entry (DT_TLSDESC_GOT, 0))) |
| 2616 | return FALSE; |
| 2617 | } |
| 2618 | |
| 2619 | if (relocs) |
| 2620 | { |
| 2621 | if (!add_dynamic_entry (DT_RELA, 0) |
| 2622 | || !add_dynamic_entry (DT_RELASZ, 0) |
| 2623 | || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela)) |
| 2624 | return FALSE; |
| 2625 | |
| 2626 | /* If any dynamic relocs apply to a read-only section, |
| 2627 | then we need a DT_TEXTREL entry. */ |
| 2628 | if ((info->flags & DF_TEXTREL) == 0) |
| 2629 | elf_link_hash_traverse (&htab->elf, |
| 2630 | elf_x86_64_readonly_dynrelocs, |
| 2631 | info); |
| 2632 | |
| 2633 | if ((info->flags & DF_TEXTREL) != 0) |
| 2634 | { |
| 2635 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 2636 | return FALSE; |
| 2637 | } |
| 2638 | } |
| 2639 | } |
| 2640 | #undef add_dynamic_entry |
| 2641 | |
| 2642 | return TRUE; |
| 2643 | } |
| 2644 | |
| 2645 | static bfd_boolean |
| 2646 | elf_x86_64_always_size_sections (bfd *output_bfd, |
| 2647 | struct bfd_link_info *info) |
| 2648 | { |
| 2649 | asection *tls_sec = elf_hash_table (info)->tls_sec; |
| 2650 | |
| 2651 | if (tls_sec) |
| 2652 | { |
| 2653 | struct elf_link_hash_entry *tlsbase; |
| 2654 | |
| 2655 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), |
| 2656 | "_TLS_MODULE_BASE_", |
| 2657 | FALSE, FALSE, FALSE); |
| 2658 | |
| 2659 | if (tlsbase && tlsbase->type == STT_TLS) |
| 2660 | { |
| 2661 | struct elf_x86_64_link_hash_table *htab; |
| 2662 | struct bfd_link_hash_entry *bh = NULL; |
| 2663 | const struct elf_backend_data *bed |
| 2664 | = get_elf_backend_data (output_bfd); |
| 2665 | |
| 2666 | htab = elf_x86_64_hash_table (info); |
| 2667 | if (htab == NULL) |
| 2668 | return FALSE; |
| 2669 | |
| 2670 | if (!(_bfd_generic_link_add_one_symbol |
| 2671 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, |
| 2672 | tls_sec, 0, NULL, FALSE, |
| 2673 | bed->collect, &bh))) |
| 2674 | return FALSE; |
| 2675 | |
| 2676 | htab->tls_module_base = bh; |
| 2677 | |
| 2678 | tlsbase = (struct elf_link_hash_entry *)bh; |
| 2679 | tlsbase->def_regular = 1; |
| 2680 | tlsbase->other = STV_HIDDEN; |
| 2681 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); |
| 2682 | } |
| 2683 | } |
| 2684 | |
| 2685 | return TRUE; |
| 2686 | } |
| 2687 | |
| 2688 | /* _TLS_MODULE_BASE_ needs to be treated especially when linking |
| 2689 | executables. Rather than setting it to the beginning of the TLS |
| 2690 | section, we have to set it to the end. This function may be called |
| 2691 | multiple times, it is idempotent. */ |
| 2692 | |
| 2693 | static void |
| 2694 | elf_x86_64_set_tls_module_base (struct bfd_link_info *info) |
| 2695 | { |
| 2696 | struct elf_x86_64_link_hash_table *htab; |
| 2697 | struct bfd_link_hash_entry *base; |
| 2698 | |
| 2699 | if (!info->executable) |
| 2700 | return; |
| 2701 | |
| 2702 | htab = elf_x86_64_hash_table (info); |
| 2703 | if (htab == NULL) |
| 2704 | return; |
| 2705 | |
| 2706 | base = htab->tls_module_base; |
| 2707 | if (base == NULL) |
| 2708 | return; |
| 2709 | |
| 2710 | base->u.def.value = htab->elf.tls_size; |
| 2711 | } |
| 2712 | |
| 2713 | /* Return the base VMA address which should be subtracted from real addresses |
| 2714 | when resolving @dtpoff relocation. |
| 2715 | This is PT_TLS segment p_vaddr. */ |
| 2716 | |
| 2717 | static bfd_vma |
| 2718 | elf_x86_64_dtpoff_base (struct bfd_link_info *info) |
| 2719 | { |
| 2720 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 2721 | if (elf_hash_table (info)->tls_sec == NULL) |
| 2722 | return 0; |
| 2723 | return elf_hash_table (info)->tls_sec->vma; |
| 2724 | } |
| 2725 | |
| 2726 | /* Return the relocation value for @tpoff relocation |
| 2727 | if STT_TLS virtual address is ADDRESS. */ |
| 2728 | |
| 2729 | static bfd_vma |
| 2730 | elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address) |
| 2731 | { |
| 2732 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 2733 | const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd); |
| 2734 | bfd_vma static_tls_size; |
| 2735 | |
| 2736 | /* If tls_segment is NULL, we should have signalled an error already. */ |
| 2737 | if (htab->tls_sec == NULL) |
| 2738 | return 0; |
| 2739 | |
| 2740 | /* Consider special static TLS alignment requirements. */ |
| 2741 | static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment); |
| 2742 | return address - static_tls_size - htab->tls_sec->vma; |
| 2743 | } |
| 2744 | |
| 2745 | /* Is the instruction before OFFSET in CONTENTS a 32bit relative |
| 2746 | branch? */ |
| 2747 | |
| 2748 | static bfd_boolean |
| 2749 | is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset) |
| 2750 | { |
| 2751 | /* Opcode Instruction |
| 2752 | 0xe8 call |
| 2753 | 0xe9 jump |
| 2754 | 0x0f 0x8x conditional jump */ |
| 2755 | return ((offset > 0 |
| 2756 | && (contents [offset - 1] == 0xe8 |
| 2757 | || contents [offset - 1] == 0xe9)) |
| 2758 | || (offset > 1 |
| 2759 | && contents [offset - 2] == 0x0f |
| 2760 | && (contents [offset - 1] & 0xf0) == 0x80)); |
| 2761 | } |
| 2762 | |
| 2763 | /* Relocate an x86_64 ELF section. */ |
| 2764 | |
| 2765 | static bfd_boolean |
| 2766 | elf_x86_64_relocate_section (bfd *output_bfd, |
| 2767 | struct bfd_link_info *info, |
| 2768 | bfd *input_bfd, |
| 2769 | asection *input_section, |
| 2770 | bfd_byte *contents, |
| 2771 | Elf_Internal_Rela *relocs, |
| 2772 | Elf_Internal_Sym *local_syms, |
| 2773 | asection **local_sections) |
| 2774 | { |
| 2775 | struct elf_x86_64_link_hash_table *htab; |
| 2776 | Elf_Internal_Shdr *symtab_hdr; |
| 2777 | struct elf_link_hash_entry **sym_hashes; |
| 2778 | bfd_vma *local_got_offsets; |
| 2779 | bfd_vma *local_tlsdesc_gotents; |
| 2780 | Elf_Internal_Rela *rel; |
| 2781 | Elf_Internal_Rela *relend; |
| 2782 | |
| 2783 | BFD_ASSERT (is_x86_64_elf (input_bfd)); |
| 2784 | |
| 2785 | htab = elf_x86_64_hash_table (info); |
| 2786 | if (htab == NULL) |
| 2787 | return FALSE; |
| 2788 | symtab_hdr = &elf_symtab_hdr (input_bfd); |
| 2789 | sym_hashes = elf_sym_hashes (input_bfd); |
| 2790 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 2791 | local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd); |
| 2792 | |
| 2793 | elf_x86_64_set_tls_module_base (info); |
| 2794 | |
| 2795 | rel = relocs; |
| 2796 | relend = relocs + input_section->reloc_count; |
| 2797 | for (; rel < relend; rel++) |
| 2798 | { |
| 2799 | unsigned int r_type; |
| 2800 | reloc_howto_type *howto; |
| 2801 | unsigned long r_symndx; |
| 2802 | struct elf_link_hash_entry *h; |
| 2803 | Elf_Internal_Sym *sym; |
| 2804 | asection *sec; |
| 2805 | bfd_vma off, offplt; |
| 2806 | bfd_vma relocation; |
| 2807 | bfd_boolean unresolved_reloc; |
| 2808 | bfd_reloc_status_type r; |
| 2809 | int tls_type; |
| 2810 | asection *base_got; |
| 2811 | |
| 2812 | r_type = ELF32_R_TYPE (rel->r_info); |
| 2813 | if (r_type == (int) R_X86_64_GNU_VTINHERIT |
| 2814 | || r_type == (int) R_X86_64_GNU_VTENTRY) |
| 2815 | continue; |
| 2816 | |
| 2817 | if (r_type >= R_X86_64_max) |
| 2818 | { |
| 2819 | bfd_set_error (bfd_error_bad_value); |
| 2820 | return FALSE; |
| 2821 | } |
| 2822 | |
| 2823 | howto = x86_64_elf_howto_table + r_type; |
| 2824 | r_symndx = htab->r_sym (rel->r_info); |
| 2825 | h = NULL; |
| 2826 | sym = NULL; |
| 2827 | sec = NULL; |
| 2828 | unresolved_reloc = FALSE; |
| 2829 | if (r_symndx < symtab_hdr->sh_info) |
| 2830 | { |
| 2831 | sym = local_syms + r_symndx; |
| 2832 | sec = local_sections[r_symndx]; |
| 2833 | |
| 2834 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, |
| 2835 | &sec, rel); |
| 2836 | |
| 2837 | /* Relocate against local STT_GNU_IFUNC symbol. */ |
| 2838 | if (!info->relocatable |
| 2839 | && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC) |
| 2840 | { |
| 2841 | h = elf_x86_64_get_local_sym_hash (htab, input_bfd, |
| 2842 | rel, FALSE); |
| 2843 | if (h == NULL) |
| 2844 | abort (); |
| 2845 | |
| 2846 | /* Set STT_GNU_IFUNC symbol value. */ |
| 2847 | h->root.u.def.value = sym->st_value; |
| 2848 | h->root.u.def.section = sec; |
| 2849 | } |
| 2850 | } |
| 2851 | else |
| 2852 | { |
| 2853 | bfd_boolean warned ATTRIBUTE_UNUSED; |
| 2854 | |
| 2855 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 2856 | r_symndx, symtab_hdr, sym_hashes, |
| 2857 | h, sec, relocation, |
| 2858 | unresolved_reloc, warned); |
| 2859 | } |
| 2860 | |
| 2861 | if (sec != NULL && elf_discarded_section (sec)) |
| 2862 | RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, |
| 2863 | rel, relend, howto, contents); |
| 2864 | |
| 2865 | if (info->relocatable) |
| 2866 | continue; |
| 2867 | |
| 2868 | /* Since STT_GNU_IFUNC symbol must go through PLT, we handle |
| 2869 | it here if it is defined in a non-shared object. */ |
| 2870 | if (h != NULL |
| 2871 | && h->type == STT_GNU_IFUNC |
| 2872 | && h->def_regular) |
| 2873 | { |
| 2874 | asection *plt; |
| 2875 | bfd_vma plt_index; |
| 2876 | const char *name; |
| 2877 | |
| 2878 | if ((input_section->flags & SEC_ALLOC) == 0 |
| 2879 | || h->plt.offset == (bfd_vma) -1) |
| 2880 | abort (); |
| 2881 | |
| 2882 | /* STT_GNU_IFUNC symbol must go through PLT. */ |
| 2883 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; |
| 2884 | relocation = (plt->output_section->vma |
| 2885 | + plt->output_offset + h->plt.offset); |
| 2886 | |
| 2887 | switch (r_type) |
| 2888 | { |
| 2889 | default: |
| 2890 | if (h->root.root.string) |
| 2891 | name = h->root.root.string; |
| 2892 | else |
| 2893 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, |
| 2894 | NULL); |
| 2895 | (*_bfd_error_handler) |
| 2896 | (_("%B: relocation %s against STT_GNU_IFUNC " |
| 2897 | "symbol `%s' isn't handled by %s"), input_bfd, |
| 2898 | x86_64_elf_howto_table[r_type].name, |
| 2899 | name, __FUNCTION__); |
| 2900 | bfd_set_error (bfd_error_bad_value); |
| 2901 | return FALSE; |
| 2902 | |
| 2903 | case R_X86_64_32S: |
| 2904 | if (info->shared) |
| 2905 | abort (); |
| 2906 | goto do_relocation; |
| 2907 | |
| 2908 | case R_X86_64_32: |
| 2909 | if (ABI_64_P (output_bfd)) |
| 2910 | goto do_relocation; |
| 2911 | /* FALLTHROUGH */ |
| 2912 | case R_X86_64_64: |
| 2913 | if (rel->r_addend != 0) |
| 2914 | { |
| 2915 | if (h->root.root.string) |
| 2916 | name = h->root.root.string; |
| 2917 | else |
| 2918 | name = bfd_elf_sym_name (input_bfd, symtab_hdr, |
| 2919 | sym, NULL); |
| 2920 | (*_bfd_error_handler) |
| 2921 | (_("%B: relocation %s against STT_GNU_IFUNC " |
| 2922 | "symbol `%s' has non-zero addend: %d"), |
| 2923 | input_bfd, x86_64_elf_howto_table[r_type].name, |
| 2924 | name, rel->r_addend); |
| 2925 | bfd_set_error (bfd_error_bad_value); |
| 2926 | return FALSE; |
| 2927 | } |
| 2928 | |
| 2929 | /* Generate dynamic relcoation only when there is a |
| 2930 | non-GOF reference in a shared object. */ |
| 2931 | if (info->shared && h->non_got_ref) |
| 2932 | { |
| 2933 | Elf_Internal_Rela outrel; |
| 2934 | asection *sreloc; |
| 2935 | |
| 2936 | /* Need a dynamic relocation to get the real function |
| 2937 | address. */ |
| 2938 | outrel.r_offset = _bfd_elf_section_offset (output_bfd, |
| 2939 | info, |
| 2940 | input_section, |
| 2941 | rel->r_offset); |
| 2942 | if (outrel.r_offset == (bfd_vma) -1 |
| 2943 | || outrel.r_offset == (bfd_vma) -2) |
| 2944 | abort (); |
| 2945 | |
| 2946 | outrel.r_offset += (input_section->output_section->vma |
| 2947 | + input_section->output_offset); |
| 2948 | |
| 2949 | if (h->dynindx == -1 |
| 2950 | || h->forced_local |
| 2951 | || info->executable) |
| 2952 | { |
| 2953 | /* This symbol is resolved locally. */ |
| 2954 | outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE); |
| 2955 | outrel.r_addend = (h->root.u.def.value |
| 2956 | + h->root.u.def.section->output_section->vma |
| 2957 | + h->root.u.def.section->output_offset); |
| 2958 | } |
| 2959 | else |
| 2960 | { |
| 2961 | outrel.r_info = htab->r_info (h->dynindx, r_type); |
| 2962 | outrel.r_addend = 0; |
| 2963 | } |
| 2964 | |
| 2965 | sreloc = htab->elf.irelifunc; |
| 2966 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 2967 | |
| 2968 | /* If this reloc is against an external symbol, we |
| 2969 | do not want to fiddle with the addend. Otherwise, |
| 2970 | we need to include the symbol value so that it |
| 2971 | becomes an addend for the dynamic reloc. For an |
| 2972 | internal symbol, we have updated addend. */ |
| 2973 | continue; |
| 2974 | } |
| 2975 | /* FALLTHROUGH */ |
| 2976 | case R_X86_64_PC32: |
| 2977 | case R_X86_64_PC64: |
| 2978 | case R_X86_64_PLT32: |
| 2979 | goto do_relocation; |
| 2980 | |
| 2981 | case R_X86_64_GOTPCREL: |
| 2982 | case R_X86_64_GOTPCREL64: |
| 2983 | base_got = htab->elf.sgot; |
| 2984 | off = h->got.offset; |
| 2985 | |
| 2986 | if (base_got == NULL) |
| 2987 | abort (); |
| 2988 | |
| 2989 | if (off == (bfd_vma) -1) |
| 2990 | { |
| 2991 | /* We can't use h->got.offset here to save state, or |
| 2992 | even just remember the offset, as finish_dynamic_symbol |
| 2993 | would use that as offset into .got. */ |
| 2994 | |
| 2995 | if (htab->elf.splt != NULL) |
| 2996 | { |
| 2997 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 2998 | off = (plt_index + 3) * GOT_ENTRY_SIZE; |
| 2999 | base_got = htab->elf.sgotplt; |
| 3000 | } |
| 3001 | else |
| 3002 | { |
| 3003 | plt_index = h->plt.offset / PLT_ENTRY_SIZE; |
| 3004 | off = plt_index * GOT_ENTRY_SIZE; |
| 3005 | base_got = htab->elf.igotplt; |
| 3006 | } |
| 3007 | |
| 3008 | if (h->dynindx == -1 |
| 3009 | || h->forced_local |
| 3010 | || info->symbolic) |
| 3011 | { |
| 3012 | /* This references the local defitionion. We must |
| 3013 | initialize this entry in the global offset table. |
| 3014 | Since the offset must always be a multiple of 8, |
| 3015 | we use the least significant bit to record |
| 3016 | whether we have initialized it already. |
| 3017 | |
| 3018 | When doing a dynamic link, we create a .rela.got |
| 3019 | relocation entry to initialize the value. This |
| 3020 | is done in the finish_dynamic_symbol routine. */ |
| 3021 | if ((off & 1) != 0) |
| 3022 | off &= ~1; |
| 3023 | else |
| 3024 | { |
| 3025 | bfd_put_64 (output_bfd, relocation, |
| 3026 | base_got->contents + off); |
| 3027 | /* Note that this is harmless for the GOTPLT64 |
| 3028 | case, as -1 | 1 still is -1. */ |
| 3029 | h->got.offset |= 1; |
| 3030 | } |
| 3031 | } |
| 3032 | } |
| 3033 | |
| 3034 | relocation = (base_got->output_section->vma |
| 3035 | + base_got->output_offset + off); |
| 3036 | |
| 3037 | goto do_relocation; |
| 3038 | } |
| 3039 | } |
| 3040 | |
| 3041 | /* When generating a shared object, the relocations handled here are |
| 3042 | copied into the output file to be resolved at run time. */ |
| 3043 | switch (r_type) |
| 3044 | { |
| 3045 | case R_X86_64_GOT32: |
| 3046 | case R_X86_64_GOT64: |
| 3047 | /* Relocation is to the entry for this symbol in the global |
| 3048 | offset table. */ |
| 3049 | case R_X86_64_GOTPCREL: |
| 3050 | case R_X86_64_GOTPCREL64: |
| 3051 | /* Use global offset table entry as symbol value. */ |
| 3052 | case R_X86_64_GOTPLT64: |
| 3053 | /* This is the same as GOT64 for relocation purposes, but |
| 3054 | indicates the existence of a PLT entry. The difficulty is, |
| 3055 | that we must calculate the GOT slot offset from the PLT |
| 3056 | offset, if this symbol got a PLT entry (it was global). |
| 3057 | Additionally if it's computed from the PLT entry, then that |
| 3058 | GOT offset is relative to .got.plt, not to .got. */ |
| 3059 | base_got = htab->elf.sgot; |
| 3060 | |
| 3061 | if (htab->elf.sgot == NULL) |
| 3062 | abort (); |
| 3063 | |
| 3064 | if (h != NULL) |
| 3065 | { |
| 3066 | bfd_boolean dyn; |
| 3067 | |
| 3068 | off = h->got.offset; |
| 3069 | if (h->needs_plt |
| 3070 | && h->plt.offset != (bfd_vma)-1 |
| 3071 | && off == (bfd_vma)-1) |
| 3072 | { |
| 3073 | /* We can't use h->got.offset here to save |
| 3074 | state, or even just remember the offset, as |
| 3075 | finish_dynamic_symbol would use that as offset into |
| 3076 | .got. */ |
| 3077 | bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 3078 | off = (plt_index + 3) * GOT_ENTRY_SIZE; |
| 3079 | base_got = htab->elf.sgotplt; |
| 3080 | } |
| 3081 | |
| 3082 | dyn = htab->elf.dynamic_sections_created; |
| 3083 | |
| 3084 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| 3085 | || (info->shared |
| 3086 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 3087 | || (ELF_ST_VISIBILITY (h->other) |
| 3088 | && h->root.type == bfd_link_hash_undefweak)) |
| 3089 | { |
| 3090 | /* This is actually a static link, or it is a -Bsymbolic |
| 3091 | link and the symbol is defined locally, or the symbol |
| 3092 | was forced to be local because of a version file. We |
| 3093 | must initialize this entry in the global offset table. |
| 3094 | Since the offset must always be a multiple of 8, we |
| 3095 | use the least significant bit to record whether we |
| 3096 | have initialized it already. |
| 3097 | |
| 3098 | When doing a dynamic link, we create a .rela.got |
| 3099 | relocation entry to initialize the value. This is |
| 3100 | done in the finish_dynamic_symbol routine. */ |
| 3101 | if ((off & 1) != 0) |
| 3102 | off &= ~1; |
| 3103 | else |
| 3104 | { |
| 3105 | bfd_put_64 (output_bfd, relocation, |
| 3106 | base_got->contents + off); |
| 3107 | /* Note that this is harmless for the GOTPLT64 case, |
| 3108 | as -1 | 1 still is -1. */ |
| 3109 | h->got.offset |= 1; |
| 3110 | } |
| 3111 | } |
| 3112 | else |
| 3113 | unresolved_reloc = FALSE; |
| 3114 | } |
| 3115 | else |
| 3116 | { |
| 3117 | if (local_got_offsets == NULL) |
| 3118 | abort (); |
| 3119 | |
| 3120 | off = local_got_offsets[r_symndx]; |
| 3121 | |
| 3122 | /* The offset must always be a multiple of 8. We use |
| 3123 | the least significant bit to record whether we have |
| 3124 | already generated the necessary reloc. */ |
| 3125 | if ((off & 1) != 0) |
| 3126 | off &= ~1; |
| 3127 | else |
| 3128 | { |
| 3129 | bfd_put_64 (output_bfd, relocation, |
| 3130 | base_got->contents + off); |
| 3131 | |
| 3132 | if (info->shared) |
| 3133 | { |
| 3134 | asection *s; |
| 3135 | Elf_Internal_Rela outrel; |
| 3136 | |
| 3137 | /* We need to generate a R_X86_64_RELATIVE reloc |
| 3138 | for the dynamic linker. */ |
| 3139 | s = htab->elf.srelgot; |
| 3140 | if (s == NULL) |
| 3141 | abort (); |
| 3142 | |
| 3143 | outrel.r_offset = (base_got->output_section->vma |
| 3144 | + base_got->output_offset |
| 3145 | + off); |
| 3146 | outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE); |
| 3147 | outrel.r_addend = relocation; |
| 3148 | elf_append_rela (output_bfd, s, &outrel); |
| 3149 | } |
| 3150 | |
| 3151 | local_got_offsets[r_symndx] |= 1; |
| 3152 | } |
| 3153 | } |
| 3154 | |
| 3155 | if (off >= (bfd_vma) -2) |
| 3156 | abort (); |
| 3157 | |
| 3158 | relocation = base_got->output_section->vma |
| 3159 | + base_got->output_offset + off; |
| 3160 | if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64) |
| 3161 | relocation -= htab->elf.sgotplt->output_section->vma |
| 3162 | - htab->elf.sgotplt->output_offset; |
| 3163 | |
| 3164 | break; |
| 3165 | |
| 3166 | case R_X86_64_GOTOFF64: |
| 3167 | /* Relocation is relative to the start of the global offset |
| 3168 | table. */ |
| 3169 | |
| 3170 | /* Check to make sure it isn't a protected function symbol |
| 3171 | for shared library since it may not be local when used |
| 3172 | as function address. */ |
| 3173 | if (info->shared |
| 3174 | && h |
| 3175 | && h->def_regular |
| 3176 | && h->type == STT_FUNC |
| 3177 | && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 3178 | { |
| 3179 | (*_bfd_error_handler) |
| 3180 | (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"), |
| 3181 | input_bfd, h->root.root.string); |
| 3182 | bfd_set_error (bfd_error_bad_value); |
| 3183 | return FALSE; |
| 3184 | } |
| 3185 | |
| 3186 | /* Note that sgot is not involved in this |
| 3187 | calculation. We always want the start of .got.plt. If we |
| 3188 | defined _GLOBAL_OFFSET_TABLE_ in a different way, as is |
| 3189 | permitted by the ABI, we might have to change this |
| 3190 | calculation. */ |
| 3191 | relocation -= htab->elf.sgotplt->output_section->vma |
| 3192 | + htab->elf.sgotplt->output_offset; |
| 3193 | break; |
| 3194 | |
| 3195 | case R_X86_64_GOTPC32: |
| 3196 | case R_X86_64_GOTPC64: |
| 3197 | /* Use global offset table as symbol value. */ |
| 3198 | relocation = htab->elf.sgotplt->output_section->vma |
| 3199 | + htab->elf.sgotplt->output_offset; |
| 3200 | unresolved_reloc = FALSE; |
| 3201 | break; |
| 3202 | |
| 3203 | case R_X86_64_PLTOFF64: |
| 3204 | /* Relocation is PLT entry relative to GOT. For local |
| 3205 | symbols it's the symbol itself relative to GOT. */ |
| 3206 | if (h != NULL |
| 3207 | /* See PLT32 handling. */ |
| 3208 | && h->plt.offset != (bfd_vma) -1 |
| 3209 | && htab->elf.splt != NULL) |
| 3210 | { |
| 3211 | relocation = (htab->elf.splt->output_section->vma |
| 3212 | + htab->elf.splt->output_offset |
| 3213 | + h->plt.offset); |
| 3214 | unresolved_reloc = FALSE; |
| 3215 | } |
| 3216 | |
| 3217 | relocation -= htab->elf.sgotplt->output_section->vma |
| 3218 | + htab->elf.sgotplt->output_offset; |
| 3219 | break; |
| 3220 | |
| 3221 | case R_X86_64_PLT32: |
| 3222 | /* Relocation is to the entry for this symbol in the |
| 3223 | procedure linkage table. */ |
| 3224 | |
| 3225 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 3226 | without using the procedure linkage table. */ |
| 3227 | if (h == NULL) |
| 3228 | break; |
| 3229 | |
| 3230 | if (h->plt.offset == (bfd_vma) -1 |
| 3231 | || htab->elf.splt == NULL) |
| 3232 | { |
| 3233 | /* We didn't make a PLT entry for this symbol. This |
| 3234 | happens when statically linking PIC code, or when |
| 3235 | using -Bsymbolic. */ |
| 3236 | break; |
| 3237 | } |
| 3238 | |
| 3239 | relocation = (htab->elf.splt->output_section->vma |
| 3240 | + htab->elf.splt->output_offset |
| 3241 | + h->plt.offset); |
| 3242 | unresolved_reloc = FALSE; |
| 3243 | break; |
| 3244 | |
| 3245 | case R_X86_64_PC8: |
| 3246 | case R_X86_64_PC16: |
| 3247 | case R_X86_64_PC32: |
| 3248 | if (info->shared |
| 3249 | && ABI_64_P (output_bfd) |
| 3250 | && (input_section->flags & SEC_ALLOC) != 0 |
| 3251 | && (input_section->flags & SEC_READONLY) != 0 |
| 3252 | && h != NULL) |
| 3253 | { |
| 3254 | bfd_boolean fail = FALSE; |
| 3255 | bfd_boolean branch |
| 3256 | = (r_type == R_X86_64_PC32 |
| 3257 | && is_32bit_relative_branch (contents, rel->r_offset)); |
| 3258 | |
| 3259 | if (SYMBOL_REFERENCES_LOCAL (info, h)) |
| 3260 | { |
| 3261 | /* Symbol is referenced locally. Make sure it is |
| 3262 | defined locally or for a branch. */ |
| 3263 | fail = !h->def_regular && !branch; |
| 3264 | } |
| 3265 | else |
| 3266 | { |
| 3267 | /* Symbol isn't referenced locally. We only allow |
| 3268 | branch to symbol with non-default visibility. */ |
| 3269 | fail = (!branch |
| 3270 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT); |
| 3271 | } |
| 3272 | |
| 3273 | if (fail) |
| 3274 | { |
| 3275 | const char *fmt; |
| 3276 | const char *v; |
| 3277 | const char *pic = ""; |
| 3278 | |
| 3279 | switch (ELF_ST_VISIBILITY (h->other)) |
| 3280 | { |
| 3281 | case STV_HIDDEN: |
| 3282 | v = _("hidden symbol"); |
| 3283 | break; |
| 3284 | case STV_INTERNAL: |
| 3285 | v = _("internal symbol"); |
| 3286 | break; |
| 3287 | case STV_PROTECTED: |
| 3288 | v = _("protected symbol"); |
| 3289 | break; |
| 3290 | default: |
| 3291 | v = _("symbol"); |
| 3292 | pic = _("; recompile with -fPIC"); |
| 3293 | break; |
| 3294 | } |
| 3295 | |
| 3296 | if (h->def_regular) |
| 3297 | fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s"); |
| 3298 | else |
| 3299 | fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s"); |
| 3300 | |
| 3301 | (*_bfd_error_handler) (fmt, input_bfd, |
| 3302 | x86_64_elf_howto_table[r_type].name, |
| 3303 | v, h->root.root.string, pic); |
| 3304 | bfd_set_error (bfd_error_bad_value); |
| 3305 | return FALSE; |
| 3306 | } |
| 3307 | } |
| 3308 | /* Fall through. */ |
| 3309 | |
| 3310 | case R_X86_64_8: |
| 3311 | case R_X86_64_16: |
| 3312 | case R_X86_64_32: |
| 3313 | case R_X86_64_PC64: |
| 3314 | case R_X86_64_64: |
| 3315 | /* FIXME: The ABI says the linker should make sure the value is |
| 3316 | the same when it's zeroextended to 64 bit. */ |
| 3317 | |
| 3318 | if ((input_section->flags & SEC_ALLOC) == 0) |
| 3319 | break; |
| 3320 | |
| 3321 | if ((info->shared |
| 3322 | && (h == NULL |
| 3323 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 3324 | || h->root.type != bfd_link_hash_undefweak) |
| 3325 | && (! IS_X86_64_PCREL_TYPE (r_type) |
| 3326 | || ! SYMBOL_CALLS_LOCAL (info, h))) |
| 3327 | || (ELIMINATE_COPY_RELOCS |
| 3328 | && !info->shared |
| 3329 | && h != NULL |
| 3330 | && h->dynindx != -1 |
| 3331 | && !h->non_got_ref |
| 3332 | && ((h->def_dynamic |
| 3333 | && !h->def_regular) |
| 3334 | || h->root.type == bfd_link_hash_undefweak |
| 3335 | || h->root.type == bfd_link_hash_undefined))) |
| 3336 | { |
| 3337 | Elf_Internal_Rela outrel; |
| 3338 | bfd_boolean skip, relocate; |
| 3339 | asection *sreloc; |
| 3340 | |
| 3341 | /* When generating a shared object, these relocations |
| 3342 | are copied into the output file to be resolved at run |
| 3343 | time. */ |
| 3344 | skip = FALSE; |
| 3345 | relocate = FALSE; |
| 3346 | |
| 3347 | outrel.r_offset = |
| 3348 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 3349 | rel->r_offset); |
| 3350 | if (outrel.r_offset == (bfd_vma) -1) |
| 3351 | skip = TRUE; |
| 3352 | else if (outrel.r_offset == (bfd_vma) -2) |
| 3353 | skip = TRUE, relocate = TRUE; |
| 3354 | |
| 3355 | outrel.r_offset += (input_section->output_section->vma |
| 3356 | + input_section->output_offset); |
| 3357 | |
| 3358 | if (skip) |
| 3359 | memset (&outrel, 0, sizeof outrel); |
| 3360 | |
| 3361 | /* h->dynindx may be -1 if this symbol was marked to |
| 3362 | become local. */ |
| 3363 | else if (h != NULL |
| 3364 | && h->dynindx != -1 |
| 3365 | && (IS_X86_64_PCREL_TYPE (r_type) |
| 3366 | || ! info->shared |
| 3367 | || ! SYMBOLIC_BIND (info, h) |
| 3368 | || ! h->def_regular)) |
| 3369 | { |
| 3370 | outrel.r_info = htab->r_info (h->dynindx, r_type); |
| 3371 | outrel.r_addend = rel->r_addend; |
| 3372 | } |
| 3373 | else |
| 3374 | { |
| 3375 | /* This symbol is local, or marked to become local. */ |
| 3376 | if (r_type == htab->pointer_r_type) |
| 3377 | { |
| 3378 | relocate = TRUE; |
| 3379 | outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE); |
| 3380 | outrel.r_addend = relocation + rel->r_addend; |
| 3381 | } |
| 3382 | else |
| 3383 | { |
| 3384 | long sindx; |
| 3385 | |
| 3386 | if (bfd_is_abs_section (sec)) |
| 3387 | sindx = 0; |
| 3388 | else if (sec == NULL || sec->owner == NULL) |
| 3389 | { |
| 3390 | bfd_set_error (bfd_error_bad_value); |
| 3391 | return FALSE; |
| 3392 | } |
| 3393 | else |
| 3394 | { |
| 3395 | asection *osec; |
| 3396 | |
| 3397 | /* We are turning this relocation into one |
| 3398 | against a section symbol. It would be |
| 3399 | proper to subtract the symbol's value, |
| 3400 | osec->vma, from the emitted reloc addend, |
| 3401 | but ld.so expects buggy relocs. */ |
| 3402 | osec = sec->output_section; |
| 3403 | sindx = elf_section_data (osec)->dynindx; |
| 3404 | if (sindx == 0) |
| 3405 | { |
| 3406 | asection *oi = htab->elf.text_index_section; |
| 3407 | sindx = elf_section_data (oi)->dynindx; |
| 3408 | } |
| 3409 | BFD_ASSERT (sindx != 0); |
| 3410 | } |
| 3411 | |
| 3412 | outrel.r_info = htab->r_info (sindx, r_type); |
| 3413 | outrel.r_addend = relocation + rel->r_addend; |
| 3414 | } |
| 3415 | } |
| 3416 | |
| 3417 | sreloc = elf_section_data (input_section)->sreloc; |
| 3418 | |
| 3419 | if (sreloc == NULL || sreloc->contents == NULL) |
| 3420 | { |
| 3421 | r = bfd_reloc_notsupported; |
| 3422 | goto check_relocation_error; |
| 3423 | } |
| 3424 | |
| 3425 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 3426 | |
| 3427 | /* If this reloc is against an external symbol, we do |
| 3428 | not want to fiddle with the addend. Otherwise, we |
| 3429 | need to include the symbol value so that it becomes |
| 3430 | an addend for the dynamic reloc. */ |
| 3431 | if (! relocate) |
| 3432 | continue; |
| 3433 | } |
| 3434 | |
| 3435 | break; |
| 3436 | |
| 3437 | case R_X86_64_TLSGD: |
| 3438 | case R_X86_64_GOTPC32_TLSDESC: |
| 3439 | case R_X86_64_TLSDESC_CALL: |
| 3440 | case R_X86_64_GOTTPOFF: |
| 3441 | tls_type = GOT_UNKNOWN; |
| 3442 | if (h == NULL && local_got_offsets) |
| 3443 | tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx]; |
| 3444 | else if (h != NULL) |
| 3445 | tls_type = elf_x86_64_hash_entry (h)->tls_type; |
| 3446 | |
| 3447 | if (! elf_x86_64_tls_transition (info, input_bfd, |
| 3448 | input_section, contents, |
| 3449 | symtab_hdr, sym_hashes, |
| 3450 | &r_type, tls_type, rel, |
| 3451 | relend, h, r_symndx)) |
| 3452 | return FALSE; |
| 3453 | |
| 3454 | if (r_type == R_X86_64_TPOFF32) |
| 3455 | { |
| 3456 | bfd_vma roff = rel->r_offset; |
| 3457 | |
| 3458 | BFD_ASSERT (! unresolved_reloc); |
| 3459 | |
| 3460 | if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD) |
| 3461 | { |
| 3462 | /* GD->LE transition. For 64bit, change |
| 3463 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 3464 | .word 0x6666; rex64; call __tls_get_addr |
| 3465 | into: |
| 3466 | movq %fs:0, %rax |
| 3467 | leaq foo@tpoff(%rax), %rax |
| 3468 | For 32bit, change |
| 3469 | leaq foo@tlsgd(%rip), %rdi |
| 3470 | .word 0x6666; rex64; call __tls_get_addr |
| 3471 | into: |
| 3472 | movl %fs:0, %eax |
| 3473 | leaq foo@tpoff(%rax), %rax */ |
| 3474 | if (ABI_64_P (output_bfd)) |
| 3475 | memcpy (contents + roff - 4, |
| 3476 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", |
| 3477 | 16); |
| 3478 | else |
| 3479 | memcpy (contents + roff - 3, |
| 3480 | "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", |
| 3481 | 15); |
| 3482 | bfd_put_32 (output_bfd, |
| 3483 | elf_x86_64_tpoff (info, relocation), |
| 3484 | contents + roff + 8); |
| 3485 | /* Skip R_X86_64_PC32/R_X86_64_PLT32. */ |
| 3486 | rel++; |
| 3487 | continue; |
| 3488 | } |
| 3489 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) |
| 3490 | { |
| 3491 | /* GDesc -> LE transition. |
| 3492 | It's originally something like: |
| 3493 | leaq x@tlsdesc(%rip), %rax |
| 3494 | |
| 3495 | Change it to: |
| 3496 | movl $x@tpoff, %rax. */ |
| 3497 | |
| 3498 | unsigned int val, type; |
| 3499 | |
| 3500 | type = bfd_get_8 (input_bfd, contents + roff - 3); |
| 3501 | val = bfd_get_8 (input_bfd, contents + roff - 1); |
| 3502 | bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1), |
| 3503 | contents + roff - 3); |
| 3504 | bfd_put_8 (output_bfd, 0xc7, contents + roff - 2); |
| 3505 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 3506 | contents + roff - 1); |
| 3507 | bfd_put_32 (output_bfd, |
| 3508 | elf_x86_64_tpoff (info, relocation), |
| 3509 | contents + roff); |
| 3510 | continue; |
| 3511 | } |
| 3512 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) |
| 3513 | { |
| 3514 | /* GDesc -> LE transition. |
| 3515 | It's originally: |
| 3516 | call *(%rax) |
| 3517 | Turn it into: |
| 3518 | xchg %ax,%ax. */ |
| 3519 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 3520 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 3521 | continue; |
| 3522 | } |
| 3523 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF) |
| 3524 | { |
| 3525 | /* IE->LE transition: |
| 3526 | Originally it can be one of: |
| 3527 | movq foo@gottpoff(%rip), %reg |
| 3528 | addq foo@gottpoff(%rip), %reg |
| 3529 | We change it into: |
| 3530 | movq $foo, %reg |
| 3531 | leaq foo(%reg), %reg |
| 3532 | addq $foo, %reg. */ |
| 3533 | |
| 3534 | unsigned int val, type, reg; |
| 3535 | |
| 3536 | val = bfd_get_8 (input_bfd, contents + roff - 3); |
| 3537 | type = bfd_get_8 (input_bfd, contents + roff - 2); |
| 3538 | reg = bfd_get_8 (input_bfd, contents + roff - 1); |
| 3539 | reg >>= 3; |
| 3540 | if (type == 0x8b) |
| 3541 | { |
| 3542 | /* movq */ |
| 3543 | if (val == 0x4c) |
| 3544 | bfd_put_8 (output_bfd, 0x49, |
| 3545 | contents + roff - 3); |
| 3546 | else if (!ABI_64_P (output_bfd) && val == 0x44) |
| 3547 | bfd_put_8 (output_bfd, 0x41, |
| 3548 | contents + roff - 3); |
| 3549 | bfd_put_8 (output_bfd, 0xc7, |
| 3550 | contents + roff - 2); |
| 3551 | bfd_put_8 (output_bfd, 0xc0 | reg, |
| 3552 | contents + roff - 1); |
| 3553 | } |
| 3554 | else if (reg == 4) |
| 3555 | { |
| 3556 | /* addq -> addq - addressing with %rsp/%r12 is |
| 3557 | special */ |
| 3558 | if (val == 0x4c) |
| 3559 | bfd_put_8 (output_bfd, 0x49, |
| 3560 | contents + roff - 3); |
| 3561 | else if (!ABI_64_P (output_bfd) && val == 0x44) |
| 3562 | bfd_put_8 (output_bfd, 0x41, |
| 3563 | contents + roff - 3); |
| 3564 | bfd_put_8 (output_bfd, 0x81, |
| 3565 | contents + roff - 2); |
| 3566 | bfd_put_8 (output_bfd, 0xc0 | reg, |
| 3567 | contents + roff - 1); |
| 3568 | } |
| 3569 | else |
| 3570 | { |
| 3571 | /* addq -> leaq */ |
| 3572 | if (val == 0x4c) |
| 3573 | bfd_put_8 (output_bfd, 0x4d, |
| 3574 | contents + roff - 3); |
| 3575 | else if (!ABI_64_P (output_bfd) && val == 0x44) |
| 3576 | bfd_put_8 (output_bfd, 0x45, |
| 3577 | contents + roff - 3); |
| 3578 | bfd_put_8 (output_bfd, 0x8d, |
| 3579 | contents + roff - 2); |
| 3580 | bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), |
| 3581 | contents + roff - 1); |
| 3582 | } |
| 3583 | bfd_put_32 (output_bfd, |
| 3584 | elf_x86_64_tpoff (info, relocation), |
| 3585 | contents + roff); |
| 3586 | continue; |
| 3587 | } |
| 3588 | else |
| 3589 | BFD_ASSERT (FALSE); |
| 3590 | } |
| 3591 | |
| 3592 | if (htab->elf.sgot == NULL) |
| 3593 | abort (); |
| 3594 | |
| 3595 | if (h != NULL) |
| 3596 | { |
| 3597 | off = h->got.offset; |
| 3598 | offplt = elf_x86_64_hash_entry (h)->tlsdesc_got; |
| 3599 | } |
| 3600 | else |
| 3601 | { |
| 3602 | if (local_got_offsets == NULL) |
| 3603 | abort (); |
| 3604 | |
| 3605 | off = local_got_offsets[r_symndx]; |
| 3606 | offplt = local_tlsdesc_gotents[r_symndx]; |
| 3607 | } |
| 3608 | |
| 3609 | if ((off & 1) != 0) |
| 3610 | off &= ~1; |
| 3611 | else |
| 3612 | { |
| 3613 | Elf_Internal_Rela outrel; |
| 3614 | int dr_type, indx; |
| 3615 | asection *sreloc; |
| 3616 | |
| 3617 | if (htab->elf.srelgot == NULL) |
| 3618 | abort (); |
| 3619 | |
| 3620 | indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| 3621 | |
| 3622 | if (GOT_TLS_GDESC_P (tls_type)) |
| 3623 | { |
| 3624 | outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC); |
| 3625 | BFD_ASSERT (htab->sgotplt_jump_table_size + offplt |
| 3626 | + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size); |
| 3627 | outrel.r_offset = (htab->elf.sgotplt->output_section->vma |
| 3628 | + htab->elf.sgotplt->output_offset |
| 3629 | + offplt |
| 3630 | + htab->sgotplt_jump_table_size); |
| 3631 | sreloc = htab->elf.srelplt; |
| 3632 | if (indx == 0) |
| 3633 | outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info); |
| 3634 | else |
| 3635 | outrel.r_addend = 0; |
| 3636 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 3637 | } |
| 3638 | |
| 3639 | sreloc = htab->elf.srelgot; |
| 3640 | |
| 3641 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 3642 | + htab->elf.sgot->output_offset + off); |
| 3643 | |
| 3644 | if (GOT_TLS_GD_P (tls_type)) |
| 3645 | dr_type = R_X86_64_DTPMOD64; |
| 3646 | else if (GOT_TLS_GDESC_P (tls_type)) |
| 3647 | goto dr_done; |
| 3648 | else |
| 3649 | dr_type = R_X86_64_TPOFF64; |
| 3650 | |
| 3651 | bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off); |
| 3652 | outrel.r_addend = 0; |
| 3653 | if ((dr_type == R_X86_64_TPOFF64 |
| 3654 | || dr_type == R_X86_64_TLSDESC) && indx == 0) |
| 3655 | outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info); |
| 3656 | outrel.r_info = htab->r_info (indx, dr_type); |
| 3657 | |
| 3658 | elf_append_rela (output_bfd, sreloc, &outrel); |
| 3659 | |
| 3660 | if (GOT_TLS_GD_P (tls_type)) |
| 3661 | { |
| 3662 | if (indx == 0) |
| 3663 | { |
| 3664 | BFD_ASSERT (! unresolved_reloc); |
| 3665 | bfd_put_64 (output_bfd, |
| 3666 | relocation - elf_x86_64_dtpoff_base (info), |
| 3667 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); |
| 3668 | } |
| 3669 | else |
| 3670 | { |
| 3671 | bfd_put_64 (output_bfd, 0, |
| 3672 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); |
| 3673 | outrel.r_info = htab->r_info (indx, |
| 3674 | R_X86_64_DTPOFF64); |
| 3675 | outrel.r_offset += GOT_ENTRY_SIZE; |
| 3676 | elf_append_rela (output_bfd, sreloc, |
| 3677 | &outrel); |
| 3678 | } |
| 3679 | } |
| 3680 | |
| 3681 | dr_done: |
| 3682 | if (h != NULL) |
| 3683 | h->got.offset |= 1; |
| 3684 | else |
| 3685 | local_got_offsets[r_symndx] |= 1; |
| 3686 | } |
| 3687 | |
| 3688 | if (off >= (bfd_vma) -2 |
| 3689 | && ! GOT_TLS_GDESC_P (tls_type)) |
| 3690 | abort (); |
| 3691 | if (r_type == ELF32_R_TYPE (rel->r_info)) |
| 3692 | { |
| 3693 | if (r_type == R_X86_64_GOTPC32_TLSDESC |
| 3694 | || r_type == R_X86_64_TLSDESC_CALL) |
| 3695 | relocation = htab->elf.sgotplt->output_section->vma |
| 3696 | + htab->elf.sgotplt->output_offset |
| 3697 | + offplt + htab->sgotplt_jump_table_size; |
| 3698 | else |
| 3699 | relocation = htab->elf.sgot->output_section->vma |
| 3700 | + htab->elf.sgot->output_offset + off; |
| 3701 | unresolved_reloc = FALSE; |
| 3702 | } |
| 3703 | else |
| 3704 | { |
| 3705 | bfd_vma roff = rel->r_offset; |
| 3706 | |
| 3707 | if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD) |
| 3708 | { |
| 3709 | /* GD->IE transition. For 64bit, change |
| 3710 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 3711 | .word 0x6666; rex64; call __tls_get_addr@plt |
| 3712 | into: |
| 3713 | movq %fs:0, %rax |
| 3714 | addq foo@gottpoff(%rip), %rax |
| 3715 | For 32bit, change |
| 3716 | leaq foo@tlsgd(%rip), %rdi |
| 3717 | .word 0x6666; rex64; call __tls_get_addr@plt |
| 3718 | into: |
| 3719 | movl %fs:0, %eax |
| 3720 | addq foo@gottpoff(%rip), %rax */ |
| 3721 | if (ABI_64_P (output_bfd)) |
| 3722 | memcpy (contents + roff - 4, |
| 3723 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", |
| 3724 | 16); |
| 3725 | else |
| 3726 | memcpy (contents + roff - 3, |
| 3727 | "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", |
| 3728 | 15); |
| 3729 | |
| 3730 | relocation = (htab->elf.sgot->output_section->vma |
| 3731 | + htab->elf.sgot->output_offset + off |
| 3732 | - roff |
| 3733 | - input_section->output_section->vma |
| 3734 | - input_section->output_offset |
| 3735 | - 12); |
| 3736 | bfd_put_32 (output_bfd, relocation, |
| 3737 | contents + roff + 8); |
| 3738 | /* Skip R_X86_64_PLT32. */ |
| 3739 | rel++; |
| 3740 | continue; |
| 3741 | } |
| 3742 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) |
| 3743 | { |
| 3744 | /* GDesc -> IE transition. |
| 3745 | It's originally something like: |
| 3746 | leaq x@tlsdesc(%rip), %rax |
| 3747 | |
| 3748 | Change it to: |
| 3749 | movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */ |
| 3750 | |
| 3751 | /* Now modify the instruction as appropriate. To |
| 3752 | turn a leaq into a movq in the form we use it, it |
| 3753 | suffices to change the second byte from 0x8d to |
| 3754 | 0x8b. */ |
| 3755 | bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); |
| 3756 | |
| 3757 | bfd_put_32 (output_bfd, |
| 3758 | htab->elf.sgot->output_section->vma |
| 3759 | + htab->elf.sgot->output_offset + off |
| 3760 | - rel->r_offset |
| 3761 | - input_section->output_section->vma |
| 3762 | - input_section->output_offset |
| 3763 | - 4, |
| 3764 | contents + roff); |
| 3765 | continue; |
| 3766 | } |
| 3767 | else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) |
| 3768 | { |
| 3769 | /* GDesc -> IE transition. |
| 3770 | It's originally: |
| 3771 | call *(%rax) |
| 3772 | |
| 3773 | Change it to: |
| 3774 | xchg %ax, %ax. */ |
| 3775 | |
| 3776 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 3777 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 3778 | continue; |
| 3779 | } |
| 3780 | else |
| 3781 | BFD_ASSERT (FALSE); |
| 3782 | } |
| 3783 | break; |
| 3784 | |
| 3785 | case R_X86_64_TLSLD: |
| 3786 | if (! elf_x86_64_tls_transition (info, input_bfd, |
| 3787 | input_section, contents, |
| 3788 | symtab_hdr, sym_hashes, |
| 3789 | &r_type, GOT_UNKNOWN, |
| 3790 | rel, relend, h, r_symndx)) |
| 3791 | return FALSE; |
| 3792 | |
| 3793 | if (r_type != R_X86_64_TLSLD) |
| 3794 | { |
| 3795 | /* LD->LE transition: |
| 3796 | leaq foo@tlsld(%rip), %rdi; call __tls_get_addr. |
| 3797 | For 64bit, we change it into: |
| 3798 | .word 0x6666; .byte 0x66; movq %fs:0, %rax. |
| 3799 | For 32bit, we change it into: |
| 3800 | nopl 0x0(%rax); movl %fs:0, %eax. */ |
| 3801 | |
| 3802 | BFD_ASSERT (r_type == R_X86_64_TPOFF32); |
| 3803 | if (ABI_64_P (output_bfd)) |
| 3804 | memcpy (contents + rel->r_offset - 3, |
| 3805 | "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); |
| 3806 | else |
| 3807 | memcpy (contents + rel->r_offset - 3, |
| 3808 | "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12); |
| 3809 | /* Skip R_X86_64_PC32/R_X86_64_PLT32. */ |
| 3810 | rel++; |
| 3811 | continue; |
| 3812 | } |
| 3813 | |
| 3814 | if (htab->elf.sgot == NULL) |
| 3815 | abort (); |
| 3816 | |
| 3817 | off = htab->tls_ld_got.offset; |
| 3818 | if (off & 1) |
| 3819 | off &= ~1; |
| 3820 | else |
| 3821 | { |
| 3822 | Elf_Internal_Rela outrel; |
| 3823 | |
| 3824 | if (htab->elf.srelgot == NULL) |
| 3825 | abort (); |
| 3826 | |
| 3827 | outrel.r_offset = (htab->elf.sgot->output_section->vma |
| 3828 | + htab->elf.sgot->output_offset + off); |
| 3829 | |
| 3830 | bfd_put_64 (output_bfd, 0, |
| 3831 | htab->elf.sgot->contents + off); |
| 3832 | bfd_put_64 (output_bfd, 0, |
| 3833 | htab->elf.sgot->contents + off + GOT_ENTRY_SIZE); |
| 3834 | outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64); |
| 3835 | outrel.r_addend = 0; |
| 3836 | elf_append_rela (output_bfd, htab->elf.srelgot, |
| 3837 | &outrel); |
| 3838 | htab->tls_ld_got.offset |= 1; |
| 3839 | } |
| 3840 | relocation = htab->elf.sgot->output_section->vma |
| 3841 | + htab->elf.sgot->output_offset + off; |
| 3842 | unresolved_reloc = FALSE; |
| 3843 | break; |
| 3844 | |
| 3845 | case R_X86_64_DTPOFF32: |
| 3846 | if (!info->executable|| (input_section->flags & SEC_CODE) == 0) |
| 3847 | relocation -= elf_x86_64_dtpoff_base (info); |
| 3848 | else |
| 3849 | relocation = elf_x86_64_tpoff (info, relocation); |
| 3850 | break; |
| 3851 | |
| 3852 | case R_X86_64_TPOFF32: |
| 3853 | BFD_ASSERT (info->executable); |
| 3854 | relocation = elf_x86_64_tpoff (info, relocation); |
| 3855 | break; |
| 3856 | |
| 3857 | default: |
| 3858 | break; |
| 3859 | } |
| 3860 | |
| 3861 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 3862 | because such sections are not SEC_ALLOC and thus ld.so will |
| 3863 | not process them. */ |
| 3864 | if (unresolved_reloc |
| 3865 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 3866 | && h->def_dynamic)) |
| 3867 | (*_bfd_error_handler) |
| 3868 | (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), |
| 3869 | input_bfd, |
| 3870 | input_section, |
| 3871 | (long) rel->r_offset, |
| 3872 | howto->name, |
| 3873 | h->root.root.string); |
| 3874 | |
| 3875 | do_relocation: |
| 3876 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 3877 | contents, rel->r_offset, |
| 3878 | relocation, rel->r_addend); |
| 3879 | |
| 3880 | check_relocation_error: |
| 3881 | if (r != bfd_reloc_ok) |
| 3882 | { |
| 3883 | const char *name; |
| 3884 | |
| 3885 | if (h != NULL) |
| 3886 | name = h->root.root.string; |
| 3887 | else |
| 3888 | { |
| 3889 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 3890 | symtab_hdr->sh_link, |
| 3891 | sym->st_name); |
| 3892 | if (name == NULL) |
| 3893 | return FALSE; |
| 3894 | if (*name == '\0') |
| 3895 | name = bfd_section_name (input_bfd, sec); |
| 3896 | } |
| 3897 | |
| 3898 | if (r == bfd_reloc_overflow) |
| 3899 | { |
| 3900 | if (! ((*info->callbacks->reloc_overflow) |
| 3901 | (info, (h ? &h->root : NULL), name, howto->name, |
| 3902 | (bfd_vma) 0, input_bfd, input_section, |
| 3903 | rel->r_offset))) |
| 3904 | return FALSE; |
| 3905 | } |
| 3906 | else |
| 3907 | { |
| 3908 | (*_bfd_error_handler) |
| 3909 | (_("%B(%A+0x%lx): reloc against `%s': error %d"), |
| 3910 | input_bfd, input_section, |
| 3911 | (long) rel->r_offset, name, (int) r); |
| 3912 | return FALSE; |
| 3913 | } |
| 3914 | } |
| 3915 | } |
| 3916 | |
| 3917 | return TRUE; |
| 3918 | } |
| 3919 | |
| 3920 | /* Finish up dynamic symbol handling. We set the contents of various |
| 3921 | dynamic sections here. */ |
| 3922 | |
| 3923 | static bfd_boolean |
| 3924 | elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, |
| 3925 | struct bfd_link_info *info, |
| 3926 | struct elf_link_hash_entry *h, |
| 3927 | Elf_Internal_Sym *sym) |
| 3928 | { |
| 3929 | struct elf_x86_64_link_hash_table *htab; |
| 3930 | |
| 3931 | htab = elf_x86_64_hash_table (info); |
| 3932 | if (htab == NULL) |
| 3933 | return FALSE; |
| 3934 | |
| 3935 | if (h->plt.offset != (bfd_vma) -1) |
| 3936 | { |
| 3937 | bfd_vma plt_index; |
| 3938 | bfd_vma got_offset; |
| 3939 | Elf_Internal_Rela rela; |
| 3940 | bfd_byte *loc; |
| 3941 | asection *plt, *gotplt, *relplt; |
| 3942 | const struct elf_backend_data *bed; |
| 3943 | |
| 3944 | /* When building a static executable, use .iplt, .igot.plt and |
| 3945 | .rela.iplt sections for STT_GNU_IFUNC symbols. */ |
| 3946 | if (htab->elf.splt != NULL) |
| 3947 | { |
| 3948 | plt = htab->elf.splt; |
| 3949 | gotplt = htab->elf.sgotplt; |
| 3950 | relplt = htab->elf.srelplt; |
| 3951 | } |
| 3952 | else |
| 3953 | { |
| 3954 | plt = htab->elf.iplt; |
| 3955 | gotplt = htab->elf.igotplt; |
| 3956 | relplt = htab->elf.irelplt; |
| 3957 | } |
| 3958 | |
| 3959 | /* This symbol has an entry in the procedure linkage table. Set |
| 3960 | it up. */ |
| 3961 | if ((h->dynindx == -1 |
| 3962 | && !((h->forced_local || info->executable) |
| 3963 | && h->def_regular |
| 3964 | && h->type == STT_GNU_IFUNC)) |
| 3965 | || plt == NULL |
| 3966 | || gotplt == NULL |
| 3967 | || relplt == NULL) |
| 3968 | return FALSE; |
| 3969 | |
| 3970 | /* Get the index in the procedure linkage table which |
| 3971 | corresponds to this symbol. This is the index of this symbol |
| 3972 | in all the symbols for which we are making plt entries. The |
| 3973 | first entry in the procedure linkage table is reserved. |
| 3974 | |
| 3975 | Get the offset into the .got table of the entry that |
| 3976 | corresponds to this function. Each .got entry is GOT_ENTRY_SIZE |
| 3977 | bytes. The first three are reserved for the dynamic linker. |
| 3978 | |
| 3979 | For static executables, we don't reserve anything. */ |
| 3980 | |
| 3981 | if (plt == htab->elf.splt) |
| 3982 | { |
| 3983 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 3984 | got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; |
| 3985 | } |
| 3986 | else |
| 3987 | { |
| 3988 | plt_index = h->plt.offset / PLT_ENTRY_SIZE; |
| 3989 | got_offset = plt_index * GOT_ENTRY_SIZE; |
| 3990 | } |
| 3991 | |
| 3992 | /* Fill in the entry in the procedure linkage table. */ |
| 3993 | memcpy (plt->contents + h->plt.offset, elf_x86_64_plt_entry, |
| 3994 | PLT_ENTRY_SIZE); |
| 3995 | |
| 3996 | /* Insert the relocation positions of the plt section. The magic |
| 3997 | numbers at the end of the statements are the positions of the |
| 3998 | relocations in the plt section. */ |
| 3999 | /* Put offset for jmp *name@GOTPCREL(%rip), since the |
| 4000 | instruction uses 6 bytes, subtract this value. */ |
| 4001 | bfd_put_32 (output_bfd, |
| 4002 | (gotplt->output_section->vma |
| 4003 | + gotplt->output_offset |
| 4004 | + got_offset |
| 4005 | - plt->output_section->vma |
| 4006 | - plt->output_offset |
| 4007 | - h->plt.offset |
| 4008 | - 6), |
| 4009 | plt->contents + h->plt.offset + 2); |
| 4010 | |
| 4011 | /* Don't fill PLT entry for static executables. */ |
| 4012 | if (plt == htab->elf.splt) |
| 4013 | { |
| 4014 | /* Put relocation index. */ |
| 4015 | bfd_put_32 (output_bfd, plt_index, |
| 4016 | plt->contents + h->plt.offset + 7); |
| 4017 | /* Put offset for jmp .PLT0. */ |
| 4018 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| 4019 | plt->contents + h->plt.offset + 12); |
| 4020 | } |
| 4021 | |
| 4022 | /* Fill in the entry in the global offset table, initially this |
| 4023 | points to the pushq instruction in the PLT which is at offset 6. */ |
| 4024 | bfd_put_64 (output_bfd, (plt->output_section->vma |
| 4025 | + plt->output_offset |
| 4026 | + h->plt.offset + 6), |
| 4027 | gotplt->contents + got_offset); |
| 4028 | |
| 4029 | /* Fill in the entry in the .rela.plt section. */ |
| 4030 | rela.r_offset = (gotplt->output_section->vma |
| 4031 | + gotplt->output_offset |
| 4032 | + got_offset); |
| 4033 | if (h->dynindx == -1 |
| 4034 | || ((info->executable |
| 4035 | || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 4036 | && h->def_regular |
| 4037 | && h->type == STT_GNU_IFUNC)) |
| 4038 | { |
| 4039 | /* If an STT_GNU_IFUNC symbol is locally defined, generate |
| 4040 | R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */ |
| 4041 | rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE); |
| 4042 | rela.r_addend = (h->root.u.def.value |
| 4043 | + h->root.u.def.section->output_section->vma |
| 4044 | + h->root.u.def.section->output_offset); |
| 4045 | } |
| 4046 | else |
| 4047 | { |
| 4048 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT); |
| 4049 | rela.r_addend = 0; |
| 4050 | } |
| 4051 | |
| 4052 | bed = get_elf_backend_data (output_bfd); |
| 4053 | loc = relplt->contents + plt_index * bed->s->sizeof_rela; |
| 4054 | bed->s->swap_reloca_out (output_bfd, &rela, loc); |
| 4055 | |
| 4056 | if (!h->def_regular) |
| 4057 | { |
| 4058 | /* Mark the symbol as undefined, rather than as defined in |
| 4059 | the .plt section. Leave the value if there were any |
| 4060 | relocations where pointer equality matters (this is a clue |
| 4061 | for the dynamic linker, to make function pointer |
| 4062 | comparisons work between an application and shared |
| 4063 | library), otherwise set it to zero. If a function is only |
| 4064 | called from a binary, there is no need to slow down |
| 4065 | shared libraries because of that. */ |
| 4066 | sym->st_shndx = SHN_UNDEF; |
| 4067 | if (!h->pointer_equality_needed) |
| 4068 | sym->st_value = 0; |
| 4069 | } |
| 4070 | } |
| 4071 | |
| 4072 | if (h->got.offset != (bfd_vma) -1 |
| 4073 | && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type) |
| 4074 | && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE) |
| 4075 | { |
| 4076 | Elf_Internal_Rela rela; |
| 4077 | |
| 4078 | /* This symbol has an entry in the global offset table. Set it |
| 4079 | up. */ |
| 4080 | if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL) |
| 4081 | abort (); |
| 4082 | |
| 4083 | rela.r_offset = (htab->elf.sgot->output_section->vma |
| 4084 | + htab->elf.sgot->output_offset |
| 4085 | + (h->got.offset &~ (bfd_vma) 1)); |
| 4086 | |
| 4087 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 4088 | symbol is defined locally or was forced to be local because |
| 4089 | of a version file, we just want to emit a RELATIVE reloc. |
| 4090 | The entry in the global offset table will already have been |
| 4091 | initialized in the relocate_section function. */ |
| 4092 | if (h->def_regular |
| 4093 | && h->type == STT_GNU_IFUNC) |
| 4094 | { |
| 4095 | if (info->shared) |
| 4096 | { |
| 4097 | /* Generate R_X86_64_GLOB_DAT. */ |
| 4098 | goto do_glob_dat; |
| 4099 | } |
| 4100 | else |
| 4101 | { |
| 4102 | asection *plt; |
| 4103 | |
| 4104 | if (!h->pointer_equality_needed) |
| 4105 | abort (); |
| 4106 | |
| 4107 | /* For non-shared object, we can't use .got.plt, which |
| 4108 | contains the real function addres if we need pointer |
| 4109 | equality. We load the GOT entry with the PLT entry. */ |
| 4110 | plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt; |
| 4111 | bfd_put_64 (output_bfd, (plt->output_section->vma |
| 4112 | + plt->output_offset |
| 4113 | + h->plt.offset), |
| 4114 | htab->elf.sgot->contents + h->got.offset); |
| 4115 | return TRUE; |
| 4116 | } |
| 4117 | } |
| 4118 | else if (info->shared |
| 4119 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 4120 | { |
| 4121 | if (!h->def_regular) |
| 4122 | return FALSE; |
| 4123 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 4124 | rela.r_info = htab->r_info (0, R_X86_64_RELATIVE); |
| 4125 | rela.r_addend = (h->root.u.def.value |
| 4126 | + h->root.u.def.section->output_section->vma |
| 4127 | + h->root.u.def.section->output_offset); |
| 4128 | } |
| 4129 | else |
| 4130 | { |
| 4131 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 4132 | do_glob_dat: |
| 4133 | bfd_put_64 (output_bfd, (bfd_vma) 0, |
| 4134 | htab->elf.sgot->contents + h->got.offset); |
| 4135 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT); |
| 4136 | rela.r_addend = 0; |
| 4137 | } |
| 4138 | |
| 4139 | elf_append_rela (output_bfd, htab->elf.srelgot, &rela); |
| 4140 | } |
| 4141 | |
| 4142 | if (h->needs_copy) |
| 4143 | { |
| 4144 | Elf_Internal_Rela rela; |
| 4145 | |
| 4146 | /* This symbol needs a copy reloc. Set it up. */ |
| 4147 | |
| 4148 | if (h->dynindx == -1 |
| 4149 | || (h->root.type != bfd_link_hash_defined |
| 4150 | && h->root.type != bfd_link_hash_defweak) |
| 4151 | || htab->srelbss == NULL) |
| 4152 | abort (); |
| 4153 | |
| 4154 | rela.r_offset = (h->root.u.def.value |
| 4155 | + h->root.u.def.section->output_section->vma |
| 4156 | + h->root.u.def.section->output_offset); |
| 4157 | rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY); |
| 4158 | rela.r_addend = 0; |
| 4159 | elf_append_rela (output_bfd, htab->srelbss, &rela); |
| 4160 | } |
| 4161 | |
| 4162 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may |
| 4163 | be NULL for local symbols. */ |
| 4164 | if (sym != NULL |
| 4165 | && (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 4166 | || h == htab->elf.hgot)) |
| 4167 | sym->st_shndx = SHN_ABS; |
| 4168 | |
| 4169 | return TRUE; |
| 4170 | } |
| 4171 | |
| 4172 | /* Finish up local dynamic symbol handling. We set the contents of |
| 4173 | various dynamic sections here. */ |
| 4174 | |
| 4175 | static bfd_boolean |
| 4176 | elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf) |
| 4177 | { |
| 4178 | struct elf_link_hash_entry *h |
| 4179 | = (struct elf_link_hash_entry *) *slot; |
| 4180 | struct bfd_link_info *info |
| 4181 | = (struct bfd_link_info *) inf; |
| 4182 | |
| 4183 | return elf_x86_64_finish_dynamic_symbol (info->output_bfd, |
| 4184 | info, h, NULL); |
| 4185 | } |
| 4186 | |
| 4187 | /* Used to decide how to sort relocs in an optimal manner for the |
| 4188 | dynamic linker, before writing them out. */ |
| 4189 | |
| 4190 | static enum elf_reloc_type_class |
| 4191 | elf_x86_64_reloc_type_class (const Elf_Internal_Rela *rela) |
| 4192 | { |
| 4193 | switch ((int) ELF32_R_TYPE (rela->r_info)) |
| 4194 | { |
| 4195 | case R_X86_64_RELATIVE: |
| 4196 | return reloc_class_relative; |
| 4197 | case R_X86_64_JUMP_SLOT: |
| 4198 | return reloc_class_plt; |
| 4199 | case R_X86_64_COPY: |
| 4200 | return reloc_class_copy; |
| 4201 | default: |
| 4202 | return reloc_class_normal; |
| 4203 | } |
| 4204 | } |
| 4205 | |
| 4206 | /* Finish up the dynamic sections. */ |
| 4207 | |
| 4208 | static bfd_boolean |
| 4209 | elf_x86_64_finish_dynamic_sections (bfd *output_bfd, |
| 4210 | struct bfd_link_info *info) |
| 4211 | { |
| 4212 | struct elf_x86_64_link_hash_table *htab; |
| 4213 | bfd *dynobj; |
| 4214 | asection *sdyn; |
| 4215 | |
| 4216 | htab = elf_x86_64_hash_table (info); |
| 4217 | if (htab == NULL) |
| 4218 | return FALSE; |
| 4219 | |
| 4220 | dynobj = htab->elf.dynobj; |
| 4221 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 4222 | |
| 4223 | if (htab->elf.dynamic_sections_created) |
| 4224 | { |
| 4225 | bfd_byte *dyncon, *dynconend; |
| 4226 | const struct elf_backend_data *bed; |
| 4227 | bfd_size_type sizeof_dyn; |
| 4228 | |
| 4229 | if (sdyn == NULL || htab->elf.sgot == NULL) |
| 4230 | abort (); |
| 4231 | |
| 4232 | bed = get_elf_backend_data (dynobj); |
| 4233 | sizeof_dyn = bed->s->sizeof_dyn; |
| 4234 | dyncon = sdyn->contents; |
| 4235 | dynconend = sdyn->contents + sdyn->size; |
| 4236 | for (; dyncon < dynconend; dyncon += sizeof_dyn) |
| 4237 | { |
| 4238 | Elf_Internal_Dyn dyn; |
| 4239 | asection *s; |
| 4240 | |
| 4241 | (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn); |
| 4242 | |
| 4243 | switch (dyn.d_tag) |
| 4244 | { |
| 4245 | default: |
| 4246 | continue; |
| 4247 | |
| 4248 | case DT_PLTGOT: |
| 4249 | s = htab->elf.sgotplt; |
| 4250 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 4251 | break; |
| 4252 | |
| 4253 | case DT_JMPREL: |
| 4254 | dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma; |
| 4255 | break; |
| 4256 | |
| 4257 | case DT_PLTRELSZ: |
| 4258 | s = htab->elf.srelplt->output_section; |
| 4259 | dyn.d_un.d_val = s->size; |
| 4260 | break; |
| 4261 | |
| 4262 | case DT_RELASZ: |
| 4263 | /* The procedure linkage table relocs (DT_JMPREL) should |
| 4264 | not be included in the overall relocs (DT_RELA). |
| 4265 | Therefore, we override the DT_RELASZ entry here to |
| 4266 | make it not include the JMPREL relocs. Since the |
| 4267 | linker script arranges for .rela.plt to follow all |
| 4268 | other relocation sections, we don't have to worry |
| 4269 | about changing the DT_RELA entry. */ |
| 4270 | if (htab->elf.srelplt != NULL) |
| 4271 | { |
| 4272 | s = htab->elf.srelplt->output_section; |
| 4273 | dyn.d_un.d_val -= s->size; |
| 4274 | } |
| 4275 | break; |
| 4276 | |
| 4277 | case DT_TLSDESC_PLT: |
| 4278 | s = htab->elf.splt; |
| 4279 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset |
| 4280 | + htab->tlsdesc_plt; |
| 4281 | break; |
| 4282 | |
| 4283 | case DT_TLSDESC_GOT: |
| 4284 | s = htab->elf.sgot; |
| 4285 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset |
| 4286 | + htab->tlsdesc_got; |
| 4287 | break; |
| 4288 | } |
| 4289 | |
| 4290 | (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon); |
| 4291 | } |
| 4292 | |
| 4293 | /* Fill in the special first entry in the procedure linkage table. */ |
| 4294 | if (htab->elf.splt && htab->elf.splt->size > 0) |
| 4295 | { |
| 4296 | /* Fill in the first entry in the procedure linkage table. */ |
| 4297 | memcpy (htab->elf.splt->contents, elf_x86_64_plt0_entry, |
| 4298 | PLT_ENTRY_SIZE); |
| 4299 | /* Add offset for pushq GOT+8(%rip), since the instruction |
| 4300 | uses 6 bytes subtract this value. */ |
| 4301 | bfd_put_32 (output_bfd, |
| 4302 | (htab->elf.sgotplt->output_section->vma |
| 4303 | + htab->elf.sgotplt->output_offset |
| 4304 | + 8 |
| 4305 | - htab->elf.splt->output_section->vma |
| 4306 | - htab->elf.splt->output_offset |
| 4307 | - 6), |
| 4308 | htab->elf.splt->contents + 2); |
| 4309 | /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to |
| 4310 | the end of the instruction. */ |
| 4311 | bfd_put_32 (output_bfd, |
| 4312 | (htab->elf.sgotplt->output_section->vma |
| 4313 | + htab->elf.sgotplt->output_offset |
| 4314 | + 16 |
| 4315 | - htab->elf.splt->output_section->vma |
| 4316 | - htab->elf.splt->output_offset |
| 4317 | - 12), |
| 4318 | htab->elf.splt->contents + 8); |
| 4319 | |
| 4320 | elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize = |
| 4321 | PLT_ENTRY_SIZE; |
| 4322 | |
| 4323 | if (htab->tlsdesc_plt) |
| 4324 | { |
| 4325 | bfd_put_64 (output_bfd, (bfd_vma) 0, |
| 4326 | htab->elf.sgot->contents + htab->tlsdesc_got); |
| 4327 | |
| 4328 | memcpy (htab->elf.splt->contents + htab->tlsdesc_plt, |
| 4329 | elf_x86_64_plt0_entry, |
| 4330 | PLT_ENTRY_SIZE); |
| 4331 | |
| 4332 | /* Add offset for pushq GOT+8(%rip), since the |
| 4333 | instruction uses 6 bytes subtract this value. */ |
| 4334 | bfd_put_32 (output_bfd, |
| 4335 | (htab->elf.sgotplt->output_section->vma |
| 4336 | + htab->elf.sgotplt->output_offset |
| 4337 | + 8 |
| 4338 | - htab->elf.splt->output_section->vma |
| 4339 | - htab->elf.splt->output_offset |
| 4340 | - htab->tlsdesc_plt |
| 4341 | - 6), |
| 4342 | htab->elf.splt->contents + htab->tlsdesc_plt + 2); |
| 4343 | /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for |
| 4344 | htab->tlsdesc_got. The 12 is the offset to the end of |
| 4345 | the instruction. */ |
| 4346 | bfd_put_32 (output_bfd, |
| 4347 | (htab->elf.sgot->output_section->vma |
| 4348 | + htab->elf.sgot->output_offset |
| 4349 | + htab->tlsdesc_got |
| 4350 | - htab->elf.splt->output_section->vma |
| 4351 | - htab->elf.splt->output_offset |
| 4352 | - htab->tlsdesc_plt |
| 4353 | - 12), |
| 4354 | htab->elf.splt->contents + htab->tlsdesc_plt + 8); |
| 4355 | } |
| 4356 | } |
| 4357 | } |
| 4358 | |
| 4359 | if (htab->elf.sgotplt) |
| 4360 | { |
| 4361 | if (bfd_is_abs_section (htab->elf.sgotplt->output_section)) |
| 4362 | { |
| 4363 | (*_bfd_error_handler) |
| 4364 | (_("discarded output section: `%A'"), htab->elf.sgotplt); |
| 4365 | return FALSE; |
| 4366 | } |
| 4367 | |
| 4368 | /* Fill in the first three entries in the global offset table. */ |
| 4369 | if (htab->elf.sgotplt->size > 0) |
| 4370 | { |
| 4371 | /* Set the first entry in the global offset table to the address of |
| 4372 | the dynamic section. */ |
| 4373 | if (sdyn == NULL) |
| 4374 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents); |
| 4375 | else |
| 4376 | bfd_put_64 (output_bfd, |
| 4377 | sdyn->output_section->vma + sdyn->output_offset, |
| 4378 | htab->elf.sgotplt->contents); |
| 4379 | /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ |
| 4380 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE); |
| 4381 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2); |
| 4382 | } |
| 4383 | |
| 4384 | elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = |
| 4385 | GOT_ENTRY_SIZE; |
| 4386 | } |
| 4387 | |
| 4388 | if (htab->elf.sgot && htab->elf.sgot->size > 0) |
| 4389 | elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize |
| 4390 | = GOT_ENTRY_SIZE; |
| 4391 | |
| 4392 | /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */ |
| 4393 | htab_traverse (htab->loc_hash_table, |
| 4394 | elf_x86_64_finish_local_dynamic_symbol, |
| 4395 | info); |
| 4396 | |
| 4397 | return TRUE; |
| 4398 | } |
| 4399 | |
| 4400 | /* Return address for Ith PLT stub in section PLT, for relocation REL |
| 4401 | or (bfd_vma) -1 if it should not be included. */ |
| 4402 | |
| 4403 | static bfd_vma |
| 4404 | elf_x86_64_plt_sym_val (bfd_vma i, const asection *plt, |
| 4405 | const arelent *rel ATTRIBUTE_UNUSED) |
| 4406 | { |
| 4407 | return plt->vma + (i + 1) * PLT_ENTRY_SIZE; |
| 4408 | } |
| 4409 | |
| 4410 | /* Handle an x86-64 specific section when reading an object file. This |
| 4411 | is called when elfcode.h finds a section with an unknown type. */ |
| 4412 | |
| 4413 | static bfd_boolean |
| 4414 | elf_x86_64_section_from_shdr (bfd *abfd, |
| 4415 | Elf_Internal_Shdr *hdr, |
| 4416 | const char *name, |
| 4417 | int shindex) |
| 4418 | { |
| 4419 | if (hdr->sh_type != SHT_X86_64_UNWIND) |
| 4420 | return FALSE; |
| 4421 | |
| 4422 | if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) |
| 4423 | return FALSE; |
| 4424 | |
| 4425 | return TRUE; |
| 4426 | } |
| 4427 | |
| 4428 | /* Hook called by the linker routine which adds symbols from an object |
| 4429 | file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead |
| 4430 | of .bss. */ |
| 4431 | |
| 4432 | static bfd_boolean |
| 4433 | elf_x86_64_add_symbol_hook (bfd *abfd, |
| 4434 | struct bfd_link_info *info, |
| 4435 | Elf_Internal_Sym *sym, |
| 4436 | const char **namep ATTRIBUTE_UNUSED, |
| 4437 | flagword *flagsp ATTRIBUTE_UNUSED, |
| 4438 | asection **secp, |
| 4439 | bfd_vma *valp) |
| 4440 | { |
| 4441 | asection *lcomm; |
| 4442 | |
| 4443 | switch (sym->st_shndx) |
| 4444 | { |
| 4445 | case SHN_X86_64_LCOMMON: |
| 4446 | lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON"); |
| 4447 | if (lcomm == NULL) |
| 4448 | { |
| 4449 | lcomm = bfd_make_section_with_flags (abfd, |
| 4450 | "LARGE_COMMON", |
| 4451 | (SEC_ALLOC |
| 4452 | | SEC_IS_COMMON |
| 4453 | | SEC_LINKER_CREATED)); |
| 4454 | if (lcomm == NULL) |
| 4455 | return FALSE; |
| 4456 | elf_section_flags (lcomm) |= SHF_X86_64_LARGE; |
| 4457 | } |
| 4458 | *secp = lcomm; |
| 4459 | *valp = sym->st_size; |
| 4460 | return TRUE; |
| 4461 | } |
| 4462 | |
| 4463 | if ((abfd->flags & DYNAMIC) == 0 |
| 4464 | && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC |
| 4465 | || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)) |
| 4466 | elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE; |
| 4467 | |
| 4468 | return TRUE; |
| 4469 | } |
| 4470 | |
| 4471 | |
| 4472 | /* Given a BFD section, try to locate the corresponding ELF section |
| 4473 | index. */ |
| 4474 | |
| 4475 | static bfd_boolean |
| 4476 | elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, |
| 4477 | asection *sec, int *index_return) |
| 4478 | { |
| 4479 | if (sec == &_bfd_elf_large_com_section) |
| 4480 | { |
| 4481 | *index_return = SHN_X86_64_LCOMMON; |
| 4482 | return TRUE; |
| 4483 | } |
| 4484 | return FALSE; |
| 4485 | } |
| 4486 | |
| 4487 | /* Process a symbol. */ |
| 4488 | |
| 4489 | static void |
| 4490 | elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, |
| 4491 | asymbol *asym) |
| 4492 | { |
| 4493 | elf_symbol_type *elfsym = (elf_symbol_type *) asym; |
| 4494 | |
| 4495 | switch (elfsym->internal_elf_sym.st_shndx) |
| 4496 | { |
| 4497 | case SHN_X86_64_LCOMMON: |
| 4498 | asym->section = &_bfd_elf_large_com_section; |
| 4499 | asym->value = elfsym->internal_elf_sym.st_size; |
| 4500 | /* Common symbol doesn't set BSF_GLOBAL. */ |
| 4501 | asym->flags &= ~BSF_GLOBAL; |
| 4502 | break; |
| 4503 | } |
| 4504 | } |
| 4505 | |
| 4506 | static bfd_boolean |
| 4507 | elf_x86_64_common_definition (Elf_Internal_Sym *sym) |
| 4508 | { |
| 4509 | return (sym->st_shndx == SHN_COMMON |
| 4510 | || sym->st_shndx == SHN_X86_64_LCOMMON); |
| 4511 | } |
| 4512 | |
| 4513 | static unsigned int |
| 4514 | elf_x86_64_common_section_index (asection *sec) |
| 4515 | { |
| 4516 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) |
| 4517 | return SHN_COMMON; |
| 4518 | else |
| 4519 | return SHN_X86_64_LCOMMON; |
| 4520 | } |
| 4521 | |
| 4522 | static asection * |
| 4523 | elf_x86_64_common_section (asection *sec) |
| 4524 | { |
| 4525 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) |
| 4526 | return bfd_com_section_ptr; |
| 4527 | else |
| 4528 | return &_bfd_elf_large_com_section; |
| 4529 | } |
| 4530 | |
| 4531 | static bfd_boolean |
| 4532 | elf_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 4533 | struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED, |
| 4534 | struct elf_link_hash_entry *h, |
| 4535 | Elf_Internal_Sym *sym, |
| 4536 | asection **psec, |
| 4537 | bfd_vma *pvalue ATTRIBUTE_UNUSED, |
| 4538 | unsigned int *pold_alignment ATTRIBUTE_UNUSED, |
| 4539 | bfd_boolean *skip ATTRIBUTE_UNUSED, |
| 4540 | bfd_boolean *override ATTRIBUTE_UNUSED, |
| 4541 | bfd_boolean *type_change_ok ATTRIBUTE_UNUSED, |
| 4542 | bfd_boolean *size_change_ok ATTRIBUTE_UNUSED, |
| 4543 | bfd_boolean *newdef ATTRIBUTE_UNUSED, |
| 4544 | bfd_boolean *newdyn, |
| 4545 | bfd_boolean *newdyncommon ATTRIBUTE_UNUSED, |
| 4546 | bfd_boolean *newweak ATTRIBUTE_UNUSED, |
| 4547 | bfd *abfd ATTRIBUTE_UNUSED, |
| 4548 | asection **sec, |
| 4549 | bfd_boolean *olddef ATTRIBUTE_UNUSED, |
| 4550 | bfd_boolean *olddyn, |
| 4551 | bfd_boolean *olddyncommon ATTRIBUTE_UNUSED, |
| 4552 | bfd_boolean *oldweak ATTRIBUTE_UNUSED, |
| 4553 | bfd *oldbfd, |
| 4554 | asection **oldsec) |
| 4555 | { |
| 4556 | /* A normal common symbol and a large common symbol result in a |
| 4557 | normal common symbol. We turn the large common symbol into a |
| 4558 | normal one. */ |
| 4559 | if (!*olddyn |
| 4560 | && h->root.type == bfd_link_hash_common |
| 4561 | && !*newdyn |
| 4562 | && bfd_is_com_section (*sec) |
| 4563 | && *oldsec != *sec) |
| 4564 | { |
| 4565 | if (sym->st_shndx == SHN_COMMON |
| 4566 | && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0) |
| 4567 | { |
| 4568 | h->root.u.c.p->section |
| 4569 | = bfd_make_section_old_way (oldbfd, "COMMON"); |
| 4570 | h->root.u.c.p->section->flags = SEC_ALLOC; |
| 4571 | } |
| 4572 | else if (sym->st_shndx == SHN_X86_64_LCOMMON |
| 4573 | && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0) |
| 4574 | *psec = *sec = bfd_com_section_ptr; |
| 4575 | } |
| 4576 | |
| 4577 | return TRUE; |
| 4578 | } |
| 4579 | |
| 4580 | static int |
| 4581 | elf_x86_64_additional_program_headers (bfd *abfd, |
| 4582 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 4583 | { |
| 4584 | asection *s; |
| 4585 | int count = 0; |
| 4586 | |
| 4587 | /* Check to see if we need a large readonly segment. */ |
| 4588 | s = bfd_get_section_by_name (abfd, ".lrodata"); |
| 4589 | if (s && (s->flags & SEC_LOAD)) |
| 4590 | count++; |
| 4591 | |
| 4592 | /* Check to see if we need a large data segment. Since .lbss sections |
| 4593 | is placed right after the .bss section, there should be no need for |
| 4594 | a large data segment just because of .lbss. */ |
| 4595 | s = bfd_get_section_by_name (abfd, ".ldata"); |
| 4596 | if (s && (s->flags & SEC_LOAD)) |
| 4597 | count++; |
| 4598 | |
| 4599 | return count; |
| 4600 | } |
| 4601 | |
| 4602 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ |
| 4603 | |
| 4604 | static bfd_boolean |
| 4605 | elf_x86_64_hash_symbol (struct elf_link_hash_entry *h) |
| 4606 | { |
| 4607 | if (h->plt.offset != (bfd_vma) -1 |
| 4608 | && !h->def_regular |
| 4609 | && !h->pointer_equality_needed) |
| 4610 | return FALSE; |
| 4611 | |
| 4612 | return _bfd_elf_hash_symbol (h); |
| 4613 | } |
| 4614 | |
| 4615 | /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */ |
| 4616 | |
| 4617 | static bfd_boolean |
| 4618 | elf_x86_64_relocs_compatible (const bfd_target *input, |
| 4619 | const bfd_target *output) |
| 4620 | { |
| 4621 | return ((xvec_get_elf_backend_data (input)->s->elfclass |
| 4622 | == xvec_get_elf_backend_data (output)->s->elfclass) |
| 4623 | && _bfd_elf_relocs_compatible (input, output)); |
| 4624 | } |
| 4625 | |
| 4626 | static const struct bfd_elf_special_section |
| 4627 | elf_x86_64_special_sections[]= |
| 4628 | { |
| 4629 | { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 4630 | { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, |
| 4631 | { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE}, |
| 4632 | { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 4633 | { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 4634 | { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, |
| 4635 | { NULL, 0, 0, 0, 0 } |
| 4636 | }; |
| 4637 | |
| 4638 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec |
| 4639 | #define TARGET_LITTLE_NAME "elf64-x86-64" |
| 4640 | #define ELF_ARCH bfd_arch_i386 |
| 4641 | #define ELF_TARGET_ID X86_64_ELF_DATA |
| 4642 | #define ELF_MACHINE_CODE EM_X86_64 |
| 4643 | #define ELF_MAXPAGESIZE 0x200000 |
| 4644 | #define ELF_MINPAGESIZE 0x1000 |
| 4645 | #define ELF_COMMONPAGESIZE 0x1000 |
| 4646 | |
| 4647 | #define elf_backend_can_gc_sections 1 |
| 4648 | #define elf_backend_can_refcount 1 |
| 4649 | #define elf_backend_want_got_plt 1 |
| 4650 | #define elf_backend_plt_readonly 1 |
| 4651 | #define elf_backend_want_plt_sym 0 |
| 4652 | #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) |
| 4653 | #define elf_backend_rela_normal 1 |
| 4654 | |
| 4655 | #define elf_info_to_howto elf_x86_64_info_to_howto |
| 4656 | |
| 4657 | #define bfd_elf64_bfd_link_hash_table_create \ |
| 4658 | elf_x86_64_link_hash_table_create |
| 4659 | #define bfd_elf64_bfd_link_hash_table_free \ |
| 4660 | elf_x86_64_link_hash_table_free |
| 4661 | #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup |
| 4662 | #define bfd_elf64_bfd_reloc_name_lookup \ |
| 4663 | elf_x86_64_reloc_name_lookup |
| 4664 | |
| 4665 | #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol |
| 4666 | #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible |
| 4667 | #define elf_backend_check_relocs elf_x86_64_check_relocs |
| 4668 | #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol |
| 4669 | #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections |
| 4670 | #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections |
| 4671 | #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol |
| 4672 | #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook |
| 4673 | #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook |
| 4674 | #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus |
| 4675 | #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo |
| 4676 | #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class |
| 4677 | #define elf_backend_relocate_section elf_x86_64_relocate_section |
| 4678 | #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections |
| 4679 | #define elf_backend_always_size_sections elf_x86_64_always_size_sections |
| 4680 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section |
| 4681 | #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val |
| 4682 | #define elf_backend_object_p elf64_x86_64_elf_object_p |
| 4683 | #define bfd_elf64_mkobject elf_x86_64_mkobject |
| 4684 | |
| 4685 | #define elf_backend_section_from_shdr \ |
| 4686 | elf_x86_64_section_from_shdr |
| 4687 | |
| 4688 | #define elf_backend_section_from_bfd_section \ |
| 4689 | elf_x86_64_elf_section_from_bfd_section |
| 4690 | #define elf_backend_add_symbol_hook \ |
| 4691 | elf_x86_64_add_symbol_hook |
| 4692 | #define elf_backend_symbol_processing \ |
| 4693 | elf_x86_64_symbol_processing |
| 4694 | #define elf_backend_common_section_index \ |
| 4695 | elf_x86_64_common_section_index |
| 4696 | #define elf_backend_common_section \ |
| 4697 | elf_x86_64_common_section |
| 4698 | #define elf_backend_common_definition \ |
| 4699 | elf_x86_64_common_definition |
| 4700 | #define elf_backend_merge_symbol \ |
| 4701 | elf_x86_64_merge_symbol |
| 4702 | #define elf_backend_special_sections \ |
| 4703 | elf_x86_64_special_sections |
| 4704 | #define elf_backend_additional_program_headers \ |
| 4705 | elf_x86_64_additional_program_headers |
| 4706 | #define elf_backend_hash_symbol \ |
| 4707 | elf_x86_64_hash_symbol |
| 4708 | |
| 4709 | #undef elf_backend_post_process_headers |
| 4710 | #define elf_backend_post_process_headers _bfd_elf_set_osabi |
| 4711 | |
| 4712 | #include "elf64-target.h" |
| 4713 | |
| 4714 | /* FreeBSD support. */ |
| 4715 | |
| 4716 | #undef TARGET_LITTLE_SYM |
| 4717 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec |
| 4718 | #undef TARGET_LITTLE_NAME |
| 4719 | #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd" |
| 4720 | |
| 4721 | #undef ELF_OSABI |
| 4722 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 4723 | |
| 4724 | #undef elf64_bed |
| 4725 | #define elf64_bed elf64_x86_64_fbsd_bed |
| 4726 | |
| 4727 | #include "elf64-target.h" |
| 4728 | |
| 4729 | /* Solaris 2 support. */ |
| 4730 | |
| 4731 | #undef TARGET_LITTLE_SYM |
| 4732 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec |
| 4733 | #undef TARGET_LITTLE_NAME |
| 4734 | #define TARGET_LITTLE_NAME "elf64-x86-64-sol2" |
| 4735 | |
| 4736 | /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE |
| 4737 | objects won't be recognized. */ |
| 4738 | #undef ELF_OSABI |
| 4739 | |
| 4740 | #undef elf64_bed |
| 4741 | #define elf64_bed elf64_x86_64_sol2_bed |
| 4742 | |
| 4743 | /* The 64-bit static TLS arena size is rounded to the nearest 16-byte |
| 4744 | boundary. */ |
| 4745 | #undef elf_backend_static_tls_alignment |
| 4746 | #define elf_backend_static_tls_alignment 16 |
| 4747 | |
| 4748 | /* The Solaris 2 ABI requires a plt symbol on all platforms. |
| 4749 | |
| 4750 | Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output |
| 4751 | File, p.63. */ |
| 4752 | #undef elf_backend_want_plt_sym |
| 4753 | #define elf_backend_want_plt_sym 1 |
| 4754 | |
| 4755 | #include "elf64-target.h" |
| 4756 | |
| 4757 | /* Intel L1OM support. */ |
| 4758 | |
| 4759 | static bfd_boolean |
| 4760 | elf64_l1om_elf_object_p (bfd *abfd) |
| 4761 | { |
| 4762 | /* Set the right machine number for an L1OM elf64 file. */ |
| 4763 | bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om); |
| 4764 | return TRUE; |
| 4765 | } |
| 4766 | |
| 4767 | #undef TARGET_LITTLE_SYM |
| 4768 | #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec |
| 4769 | #undef TARGET_LITTLE_NAME |
| 4770 | #define TARGET_LITTLE_NAME "elf64-l1om" |
| 4771 | #undef ELF_ARCH |
| 4772 | #define ELF_ARCH bfd_arch_l1om |
| 4773 | |
| 4774 | #undef ELF_MACHINE_CODE |
| 4775 | #define ELF_MACHINE_CODE EM_L1OM |
| 4776 | |
| 4777 | #undef ELF_OSABI |
| 4778 | |
| 4779 | #undef elf64_bed |
| 4780 | #define elf64_bed elf64_l1om_bed |
| 4781 | |
| 4782 | #undef elf_backend_object_p |
| 4783 | #define elf_backend_object_p elf64_l1om_elf_object_p |
| 4784 | |
| 4785 | #undef elf_backend_post_process_headers |
| 4786 | #undef elf_backend_static_tls_alignment |
| 4787 | |
| 4788 | #undef elf_backend_want_plt_sym |
| 4789 | #define elf_backend_want_plt_sym 0 |
| 4790 | |
| 4791 | #include "elf64-target.h" |
| 4792 | |
| 4793 | /* FreeBSD L1OM support. */ |
| 4794 | |
| 4795 | #undef TARGET_LITTLE_SYM |
| 4796 | #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec |
| 4797 | #undef TARGET_LITTLE_NAME |
| 4798 | #define TARGET_LITTLE_NAME "elf64-l1om-freebsd" |
| 4799 | |
| 4800 | #undef ELF_OSABI |
| 4801 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 4802 | |
| 4803 | #undef elf64_bed |
| 4804 | #define elf64_bed elf64_l1om_fbsd_bed |
| 4805 | |
| 4806 | #undef elf_backend_post_process_headers |
| 4807 | #define elf_backend_post_process_headers _bfd_elf_set_osabi |
| 4808 | |
| 4809 | #include "elf64-target.h" |
| 4810 | |
| 4811 | /* 32bit x86-64 support. */ |
| 4812 | |
| 4813 | static bfd_boolean |
| 4814 | elf32_x86_64_elf_object_p (bfd *abfd) |
| 4815 | { |
| 4816 | /* Set the right machine number for an x86-64 elf32 file. */ |
| 4817 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32); |
| 4818 | return TRUE; |
| 4819 | } |
| 4820 | |
| 4821 | #undef TARGET_LITTLE_SYM |
| 4822 | #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec |
| 4823 | #undef TARGET_LITTLE_NAME |
| 4824 | #define TARGET_LITTLE_NAME "elf32-x86-64" |
| 4825 | |
| 4826 | #undef ELF_ARCH |
| 4827 | #define ELF_ARCH bfd_arch_i386 |
| 4828 | |
| 4829 | #undef ELF_MACHINE_CODE |
| 4830 | #define ELF_MACHINE_CODE EM_X86_64 |
| 4831 | |
| 4832 | #define bfd_elf32_bfd_link_hash_table_create \ |
| 4833 | elf_x86_64_link_hash_table_create |
| 4834 | #define bfd_elf32_bfd_link_hash_table_free \ |
| 4835 | elf_x86_64_link_hash_table_free |
| 4836 | #define bfd_elf32_bfd_reloc_type_lookup \ |
| 4837 | elf_x86_64_reloc_type_lookup |
| 4838 | #define bfd_elf32_bfd_reloc_name_lookup \ |
| 4839 | elf_x86_64_reloc_name_lookup |
| 4840 | #define bfd_elf32_mkobject \ |
| 4841 | elf_x86_64_mkobject |
| 4842 | |
| 4843 | #undef ELF_OSABI |
| 4844 | |
| 4845 | #undef elf_backend_post_process_headers |
| 4846 | |
| 4847 | #undef elf_backend_object_p |
| 4848 | #define elf_backend_object_p \ |
| 4849 | elf32_x86_64_elf_object_p |
| 4850 | |
| 4851 | #undef elf_backend_bfd_from_remote_memory |
| 4852 | #define elf_backend_bfd_from_remote_memory \ |
| 4853 | _bfd_elf32_bfd_from_remote_memory |
| 4854 | |
| 4855 | #undef elf_backend_size_info |
| 4856 | #define elf_backend_size_info \ |
| 4857 | _bfd_elf32_size_info |
| 4858 | |
| 4859 | #include "elf32-target.h" |