| 1 | /* X86-64 specific support for 64-bit ELF |
| 2 | Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by Jan Hubicka <jh@suse.cz>. |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "bfdlink.h" |
| 25 | #include "libbfd.h" |
| 26 | #include "elf-bfd.h" |
| 27 | |
| 28 | #include "elf/x86-64.h" |
| 29 | |
| 30 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ |
| 31 | #define MINUS_ONE (~ (bfd_vma) 0) |
| 32 | |
| 33 | /* The relocation "howto" table. Order of fields: |
| 34 | type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow, |
| 35 | special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */ |
| 36 | static reloc_howto_type x86_64_elf_howto_table[] = |
| 37 | { |
| 38 | HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont, |
| 39 | bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000, |
| 40 | FALSE), |
| 41 | HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 42 | bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE, |
| 43 | FALSE), |
| 44 | HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 45 | bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff, |
| 46 | TRUE), |
| 47 | HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 48 | bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff, |
| 49 | FALSE), |
| 50 | HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 51 | bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff, |
| 52 | TRUE), |
| 53 | HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 54 | bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff, |
| 55 | FALSE), |
| 56 | HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 57 | bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE, |
| 58 | MINUS_ONE, FALSE), |
| 59 | HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 60 | bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE, |
| 61 | MINUS_ONE, FALSE), |
| 62 | HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 63 | bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE, |
| 64 | MINUS_ONE, FALSE), |
| 65 | HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 66 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff, |
| 67 | 0xffffffff, TRUE), |
| 68 | HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, |
| 69 | bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, |
| 70 | FALSE), |
| 71 | HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 72 | bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff, |
| 73 | FALSE), |
| 74 | HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, |
| 75 | bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE), |
| 76 | HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield, |
| 77 | bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE), |
| 78 | HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, |
| 79 | bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE), |
| 80 | HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, |
| 81 | bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE), |
| 82 | HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 83 | bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE, |
| 84 | MINUS_ONE, FALSE), |
| 85 | HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 86 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE, |
| 87 | MINUS_ONE, FALSE), |
| 88 | HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 89 | bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE, |
| 90 | MINUS_ONE, FALSE), |
| 91 | HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 92 | bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff, |
| 93 | 0xffffffff, TRUE), |
| 94 | HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 95 | bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff, |
| 96 | 0xffffffff, TRUE), |
| 97 | HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 98 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff, |
| 99 | 0xffffffff, FALSE), |
| 100 | HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 101 | bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff, |
| 102 | 0xffffffff, TRUE), |
| 103 | HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 104 | bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff, |
| 105 | 0xffffffff, FALSE), |
| 106 | HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield, |
| 107 | bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE, |
| 108 | TRUE), |
| 109 | HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 110 | bfd_elf_generic_reloc, "R_X86_64_GOTOFF64", |
| 111 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), |
| 112 | HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 113 | bfd_elf_generic_reloc, "R_X86_64_GOTPC32", |
| 114 | FALSE, 0xffffffff, 0xffffffff, TRUE), |
| 115 | HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 116 | bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE, |
| 117 | FALSE), |
| 118 | HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed, |
| 119 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE, |
| 120 | MINUS_ONE, TRUE), |
| 121 | HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed, |
| 122 | bfd_elf_generic_reloc, "R_X86_64_GOTPC64", |
| 123 | FALSE, MINUS_ONE, MINUS_ONE, TRUE), |
| 124 | HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 125 | bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE, |
| 126 | MINUS_ONE, FALSE), |
| 127 | HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed, |
| 128 | bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE, |
| 129 | MINUS_ONE, FALSE), |
| 130 | EMPTY_HOWTO (32), |
| 131 | EMPTY_HOWTO (33), |
| 132 | HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0, |
| 133 | complain_overflow_bitfield, bfd_elf_generic_reloc, |
| 134 | "R_X86_64_GOTPC32_TLSDESC", |
| 135 | FALSE, 0xffffffff, 0xffffffff, TRUE), |
| 136 | HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0, |
| 137 | complain_overflow_dont, bfd_elf_generic_reloc, |
| 138 | "R_X86_64_TLSDESC_CALL", |
| 139 | FALSE, 0, 0, FALSE), |
| 140 | HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0, |
| 141 | complain_overflow_bitfield, bfd_elf_generic_reloc, |
| 142 | "R_X86_64_TLSDESC", |
| 143 | FALSE, MINUS_ONE, MINUS_ONE, FALSE), |
| 144 | |
| 145 | /* We have a gap in the reloc numbers here. |
| 146 | R_X86_64_standard counts the number up to this point, and |
| 147 | R_X86_64_vt_offset is the value to subtract from a reloc type of |
| 148 | R_X86_64_GNU_VT* to form an index into this table. */ |
| 149 | #define R_X86_64_standard (R_X86_64_TLSDESC + 1) |
| 150 | #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard) |
| 151 | |
| 152 | /* GNU extension to record C++ vtable hierarchy. */ |
| 153 | HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| 154 | NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE), |
| 155 | |
| 156 | /* GNU extension to record C++ vtable member usage. */ |
| 157 | HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| 158 | _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0, |
| 159 | FALSE) |
| 160 | }; |
| 161 | |
| 162 | /* Map BFD relocs to the x86_64 elf relocs. */ |
| 163 | struct elf_reloc_map |
| 164 | { |
| 165 | bfd_reloc_code_real_type bfd_reloc_val; |
| 166 | unsigned char elf_reloc_val; |
| 167 | }; |
| 168 | |
| 169 | static const struct elf_reloc_map x86_64_reloc_map[] = |
| 170 | { |
| 171 | { BFD_RELOC_NONE, R_X86_64_NONE, }, |
| 172 | { BFD_RELOC_64, R_X86_64_64, }, |
| 173 | { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, |
| 174 | { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, |
| 175 | { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, |
| 176 | { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, |
| 177 | { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, |
| 178 | { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, |
| 179 | { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, |
| 180 | { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, |
| 181 | { BFD_RELOC_32, R_X86_64_32, }, |
| 182 | { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, |
| 183 | { BFD_RELOC_16, R_X86_64_16, }, |
| 184 | { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, |
| 185 | { BFD_RELOC_8, R_X86_64_8, }, |
| 186 | { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, |
| 187 | { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, |
| 188 | { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, |
| 189 | { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, |
| 190 | { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, |
| 191 | { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, |
| 192 | { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, |
| 193 | { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, |
| 194 | { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, |
| 195 | { BFD_RELOC_64_PCREL, R_X86_64_PC64, }, |
| 196 | { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, }, |
| 197 | { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, }, |
| 198 | { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, }, |
| 199 | { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, }, |
| 200 | { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, }, |
| 201 | { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, }, |
| 202 | { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, }, |
| 203 | { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, }, |
| 204 | { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, }, |
| 205 | { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, }, |
| 206 | { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, |
| 207 | { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, |
| 208 | }; |
| 209 | |
| 210 | static reloc_howto_type * |
| 211 | elf64_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type) |
| 212 | { |
| 213 | unsigned i; |
| 214 | |
| 215 | if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT |
| 216 | || r_type >= (unsigned int) R_X86_64_max) |
| 217 | { |
| 218 | if (r_type >= (unsigned int) R_X86_64_standard) |
| 219 | { |
| 220 | (*_bfd_error_handler) (_("%B: invalid relocation type %d"), |
| 221 | abfd, (int) r_type); |
| 222 | r_type = R_X86_64_NONE; |
| 223 | } |
| 224 | i = r_type; |
| 225 | } |
| 226 | else |
| 227 | i = r_type - (unsigned int) R_X86_64_vt_offset; |
| 228 | BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type); |
| 229 | return &x86_64_elf_howto_table[i]; |
| 230 | } |
| 231 | |
| 232 | /* Given a BFD reloc type, return a HOWTO structure. */ |
| 233 | static reloc_howto_type * |
| 234 | elf64_x86_64_reloc_type_lookup (bfd *abfd, |
| 235 | bfd_reloc_code_real_type code) |
| 236 | { |
| 237 | unsigned int i; |
| 238 | |
| 239 | for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); |
| 240 | i++) |
| 241 | { |
| 242 | if (x86_64_reloc_map[i].bfd_reloc_val == code) |
| 243 | return elf64_x86_64_rtype_to_howto (abfd, |
| 244 | x86_64_reloc_map[i].elf_reloc_val); |
| 245 | } |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | static reloc_howto_type * |
| 250 | elf64_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 251 | const char *r_name) |
| 252 | { |
| 253 | unsigned int i; |
| 254 | |
| 255 | for (i = 0; |
| 256 | i < (sizeof (x86_64_elf_howto_table) |
| 257 | / sizeof (x86_64_elf_howto_table[0])); |
| 258 | i++) |
| 259 | if (x86_64_elf_howto_table[i].name != NULL |
| 260 | && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0) |
| 261 | return &x86_64_elf_howto_table[i]; |
| 262 | |
| 263 | return NULL; |
| 264 | } |
| 265 | |
| 266 | /* Given an x86_64 ELF reloc type, fill in an arelent structure. */ |
| 267 | |
| 268 | static void |
| 269 | elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, |
| 270 | Elf_Internal_Rela *dst) |
| 271 | { |
| 272 | unsigned r_type; |
| 273 | |
| 274 | r_type = ELF64_R_TYPE (dst->r_info); |
| 275 | cache_ptr->howto = elf64_x86_64_rtype_to_howto (abfd, r_type); |
| 276 | BFD_ASSERT (r_type == cache_ptr->howto->type); |
| 277 | } |
| 278 | \f |
| 279 | /* Support for core dump NOTE sections. */ |
| 280 | static bfd_boolean |
| 281 | elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 282 | { |
| 283 | int offset; |
| 284 | size_t size; |
| 285 | |
| 286 | switch (note->descsz) |
| 287 | { |
| 288 | default: |
| 289 | return FALSE; |
| 290 | |
| 291 | case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ |
| 292 | /* pr_cursig */ |
| 293 | elf_tdata (abfd)->core_signal |
| 294 | = bfd_get_16 (abfd, note->descdata + 12); |
| 295 | |
| 296 | /* pr_pid */ |
| 297 | elf_tdata (abfd)->core_pid |
| 298 | = bfd_get_32 (abfd, note->descdata + 32); |
| 299 | |
| 300 | /* pr_reg */ |
| 301 | offset = 112; |
| 302 | size = 216; |
| 303 | |
| 304 | break; |
| 305 | } |
| 306 | |
| 307 | /* Make a ".reg/999" section. */ |
| 308 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 309 | size, note->descpos + offset); |
| 310 | } |
| 311 | |
| 312 | static bfd_boolean |
| 313 | elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 314 | { |
| 315 | switch (note->descsz) |
| 316 | { |
| 317 | default: |
| 318 | return FALSE; |
| 319 | |
| 320 | case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ |
| 321 | elf_tdata (abfd)->core_program |
| 322 | = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); |
| 323 | elf_tdata (abfd)->core_command |
| 324 | = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); |
| 325 | } |
| 326 | |
| 327 | /* Note that for some reason, a spurious space is tacked |
| 328 | onto the end of the args in some (at least one anyway) |
| 329 | implementations, so strip it off if it exists. */ |
| 330 | |
| 331 | { |
| 332 | char *command = elf_tdata (abfd)->core_command; |
| 333 | int n = strlen (command); |
| 334 | |
| 335 | if (0 < n && command[n - 1] == ' ') |
| 336 | command[n - 1] = '\0'; |
| 337 | } |
| 338 | |
| 339 | return TRUE; |
| 340 | } |
| 341 | \f |
| 342 | /* Functions for the x86-64 ELF linker. */ |
| 343 | |
| 344 | /* The name of the dynamic interpreter. This is put in the .interp |
| 345 | section. */ |
| 346 | |
| 347 | #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1" |
| 348 | |
| 349 | /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid |
| 350 | copying dynamic variables from a shared lib into an app's dynbss |
| 351 | section, and instead use a dynamic relocation to point into the |
| 352 | shared lib. */ |
| 353 | #define ELIMINATE_COPY_RELOCS 1 |
| 354 | |
| 355 | /* The size in bytes of an entry in the global offset table. */ |
| 356 | |
| 357 | #define GOT_ENTRY_SIZE 8 |
| 358 | |
| 359 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 360 | |
| 361 | #define PLT_ENTRY_SIZE 16 |
| 362 | |
| 363 | /* The first entry in a procedure linkage table looks like this. See the |
| 364 | SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */ |
| 365 | |
| 366 | static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] = |
| 367 | { |
| 368 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
| 369 | 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ |
| 370 | 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */ |
| 371 | }; |
| 372 | |
| 373 | /* Subsequent entries in a procedure linkage table look like this. */ |
| 374 | |
| 375 | static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] = |
| 376 | { |
| 377 | 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ |
| 378 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 379 | 0x68, /* pushq immediate */ |
| 380 | 0, 0, 0, 0, /* replaced with index into relocation table. */ |
| 381 | 0xe9, /* jmp relative */ |
| 382 | 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ |
| 383 | }; |
| 384 | |
| 385 | /* The x86-64 linker needs to keep track of the number of relocs that |
| 386 | it decides to copy as dynamic relocs in check_relocs for each symbol. |
| 387 | This is so that it can later discard them if they are found to be |
| 388 | unnecessary. We store the information in a field extending the |
| 389 | regular ELF linker hash table. */ |
| 390 | |
| 391 | struct elf64_x86_64_dyn_relocs |
| 392 | { |
| 393 | /* Next section. */ |
| 394 | struct elf64_x86_64_dyn_relocs *next; |
| 395 | |
| 396 | /* The input section of the reloc. */ |
| 397 | asection *sec; |
| 398 | |
| 399 | /* Total number of relocs copied for the input section. */ |
| 400 | bfd_size_type count; |
| 401 | |
| 402 | /* Number of pc-relative relocs copied for the input section. */ |
| 403 | bfd_size_type pc_count; |
| 404 | }; |
| 405 | |
| 406 | /* x86-64 ELF linker hash entry. */ |
| 407 | |
| 408 | struct elf64_x86_64_link_hash_entry |
| 409 | { |
| 410 | struct elf_link_hash_entry elf; |
| 411 | |
| 412 | /* Track dynamic relocs copied for this symbol. */ |
| 413 | struct elf64_x86_64_dyn_relocs *dyn_relocs; |
| 414 | |
| 415 | #define GOT_UNKNOWN 0 |
| 416 | #define GOT_NORMAL 1 |
| 417 | #define GOT_TLS_GD 2 |
| 418 | #define GOT_TLS_IE 3 |
| 419 | #define GOT_TLS_GDESC 4 |
| 420 | #define GOT_TLS_GD_BOTH_P(type) \ |
| 421 | ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) |
| 422 | #define GOT_TLS_GD_P(type) \ |
| 423 | ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type)) |
| 424 | #define GOT_TLS_GDESC_P(type) \ |
| 425 | ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type)) |
| 426 | #define GOT_TLS_GD_ANY_P(type) \ |
| 427 | (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type)) |
| 428 | unsigned char tls_type; |
| 429 | |
| 430 | /* Offset of the GOTPLT entry reserved for the TLS descriptor, |
| 431 | starting at the end of the jump table. */ |
| 432 | bfd_vma tlsdesc_got; |
| 433 | }; |
| 434 | |
| 435 | #define elf64_x86_64_hash_entry(ent) \ |
| 436 | ((struct elf64_x86_64_link_hash_entry *)(ent)) |
| 437 | |
| 438 | struct elf64_x86_64_obj_tdata |
| 439 | { |
| 440 | struct elf_obj_tdata root; |
| 441 | |
| 442 | /* tls_type for each local got entry. */ |
| 443 | char *local_got_tls_type; |
| 444 | |
| 445 | /* GOTPLT entries for TLS descriptors. */ |
| 446 | bfd_vma *local_tlsdesc_gotent; |
| 447 | }; |
| 448 | |
| 449 | #define elf64_x86_64_tdata(abfd) \ |
| 450 | ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any) |
| 451 | |
| 452 | #define elf64_x86_64_local_got_tls_type(abfd) \ |
| 453 | (elf64_x86_64_tdata (abfd)->local_got_tls_type) |
| 454 | |
| 455 | #define elf64_x86_64_local_tlsdesc_gotent(abfd) \ |
| 456 | (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent) |
| 457 | |
| 458 | /* x86-64 ELF linker hash table. */ |
| 459 | |
| 460 | struct elf64_x86_64_link_hash_table |
| 461 | { |
| 462 | struct elf_link_hash_table elf; |
| 463 | |
| 464 | /* Short-cuts to get to dynamic linker sections. */ |
| 465 | asection *sgot; |
| 466 | asection *sgotplt; |
| 467 | asection *srelgot; |
| 468 | asection *splt; |
| 469 | asection *srelplt; |
| 470 | asection *sdynbss; |
| 471 | asection *srelbss; |
| 472 | |
| 473 | /* The offset into splt of the PLT entry for the TLS descriptor |
| 474 | resolver. Special values are 0, if not necessary (or not found |
| 475 | to be necessary yet), and -1 if needed but not determined |
| 476 | yet. */ |
| 477 | bfd_vma tlsdesc_plt; |
| 478 | /* The offset into sgot of the GOT entry used by the PLT entry |
| 479 | above. */ |
| 480 | bfd_vma tlsdesc_got; |
| 481 | |
| 482 | union { |
| 483 | bfd_signed_vma refcount; |
| 484 | bfd_vma offset; |
| 485 | } tls_ld_got; |
| 486 | |
| 487 | /* The amount of space used by the jump slots in the GOT. */ |
| 488 | bfd_vma sgotplt_jump_table_size; |
| 489 | |
| 490 | /* Small local sym to section mapping cache. */ |
| 491 | struct sym_sec_cache sym_sec; |
| 492 | }; |
| 493 | |
| 494 | /* Get the x86-64 ELF linker hash table from a link_info structure. */ |
| 495 | |
| 496 | #define elf64_x86_64_hash_table(p) \ |
| 497 | ((struct elf64_x86_64_link_hash_table *) ((p)->hash)) |
| 498 | |
| 499 | #define elf64_x86_64_compute_jump_table_size(htab) \ |
| 500 | ((htab)->srelplt->reloc_count * GOT_ENTRY_SIZE) |
| 501 | |
| 502 | /* Create an entry in an x86-64 ELF linker hash table. */ |
| 503 | |
| 504 | static struct bfd_hash_entry * |
| 505 | link_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table, |
| 506 | const char *string) |
| 507 | { |
| 508 | /* Allocate the structure if it has not already been allocated by a |
| 509 | subclass. */ |
| 510 | if (entry == NULL) |
| 511 | { |
| 512 | entry = bfd_hash_allocate (table, |
| 513 | sizeof (struct elf64_x86_64_link_hash_entry)); |
| 514 | if (entry == NULL) |
| 515 | return entry; |
| 516 | } |
| 517 | |
| 518 | /* Call the allocation method of the superclass. */ |
| 519 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 520 | if (entry != NULL) |
| 521 | { |
| 522 | struct elf64_x86_64_link_hash_entry *eh; |
| 523 | |
| 524 | eh = (struct elf64_x86_64_link_hash_entry *) entry; |
| 525 | eh->dyn_relocs = NULL; |
| 526 | eh->tls_type = GOT_UNKNOWN; |
| 527 | eh->tlsdesc_got = (bfd_vma) -1; |
| 528 | } |
| 529 | |
| 530 | return entry; |
| 531 | } |
| 532 | |
| 533 | /* Create an X86-64 ELF linker hash table. */ |
| 534 | |
| 535 | static struct bfd_link_hash_table * |
| 536 | elf64_x86_64_link_hash_table_create (bfd *abfd) |
| 537 | { |
| 538 | struct elf64_x86_64_link_hash_table *ret; |
| 539 | bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table); |
| 540 | |
| 541 | ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt); |
| 542 | if (ret == NULL) |
| 543 | return NULL; |
| 544 | |
| 545 | if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc, |
| 546 | sizeof (struct elf64_x86_64_link_hash_entry))) |
| 547 | { |
| 548 | free (ret); |
| 549 | return NULL; |
| 550 | } |
| 551 | |
| 552 | ret->sgot = NULL; |
| 553 | ret->sgotplt = NULL; |
| 554 | ret->srelgot = NULL; |
| 555 | ret->splt = NULL; |
| 556 | ret->srelplt = NULL; |
| 557 | ret->sdynbss = NULL; |
| 558 | ret->srelbss = NULL; |
| 559 | ret->sym_sec.abfd = NULL; |
| 560 | ret->tlsdesc_plt = 0; |
| 561 | ret->tlsdesc_got = 0; |
| 562 | ret->tls_ld_got.refcount = 0; |
| 563 | ret->sgotplt_jump_table_size = 0; |
| 564 | |
| 565 | return &ret->elf.root; |
| 566 | } |
| 567 | |
| 568 | /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up |
| 569 | shortcuts to them in our hash table. */ |
| 570 | |
| 571 | static bfd_boolean |
| 572 | create_got_section (bfd *dynobj, struct bfd_link_info *info) |
| 573 | { |
| 574 | struct elf64_x86_64_link_hash_table *htab; |
| 575 | |
| 576 | if (! _bfd_elf_create_got_section (dynobj, info)) |
| 577 | return FALSE; |
| 578 | |
| 579 | htab = elf64_x86_64_hash_table (info); |
| 580 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 581 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 582 | if (!htab->sgot || !htab->sgotplt) |
| 583 | abort (); |
| 584 | |
| 585 | htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got", |
| 586 | (SEC_ALLOC | SEC_LOAD |
| 587 | | SEC_HAS_CONTENTS |
| 588 | | SEC_IN_MEMORY |
| 589 | | SEC_LINKER_CREATED |
| 590 | | SEC_READONLY)); |
| 591 | if (htab->srelgot == NULL |
| 592 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3)) |
| 593 | return FALSE; |
| 594 | return TRUE; |
| 595 | } |
| 596 | |
| 597 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and |
| 598 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 599 | hash table. */ |
| 600 | |
| 601 | static bfd_boolean |
| 602 | elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) |
| 603 | { |
| 604 | struct elf64_x86_64_link_hash_table *htab; |
| 605 | |
| 606 | htab = elf64_x86_64_hash_table (info); |
| 607 | if (!htab->sgot && !create_got_section (dynobj, info)) |
| 608 | return FALSE; |
| 609 | |
| 610 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 611 | return FALSE; |
| 612 | |
| 613 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 614 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| 615 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 616 | if (!info->shared) |
| 617 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); |
| 618 | |
| 619 | if (!htab->splt || !htab->srelplt || !htab->sdynbss |
| 620 | || (!info->shared && !htab->srelbss)) |
| 621 | abort (); |
| 622 | |
| 623 | return TRUE; |
| 624 | } |
| 625 | |
| 626 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 627 | |
| 628 | static void |
| 629 | elf64_x86_64_copy_indirect_symbol (struct bfd_link_info *info, |
| 630 | struct elf_link_hash_entry *dir, |
| 631 | struct elf_link_hash_entry *ind) |
| 632 | { |
| 633 | struct elf64_x86_64_link_hash_entry *edir, *eind; |
| 634 | |
| 635 | edir = (struct elf64_x86_64_link_hash_entry *) dir; |
| 636 | eind = (struct elf64_x86_64_link_hash_entry *) ind; |
| 637 | |
| 638 | if (eind->dyn_relocs != NULL) |
| 639 | { |
| 640 | if (edir->dyn_relocs != NULL) |
| 641 | { |
| 642 | struct elf64_x86_64_dyn_relocs **pp; |
| 643 | struct elf64_x86_64_dyn_relocs *p; |
| 644 | |
| 645 | /* Add reloc counts against the indirect sym to the direct sym |
| 646 | list. Merge any entries against the same section. */ |
| 647 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| 648 | { |
| 649 | struct elf64_x86_64_dyn_relocs *q; |
| 650 | |
| 651 | for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| 652 | if (q->sec == p->sec) |
| 653 | { |
| 654 | q->pc_count += p->pc_count; |
| 655 | q->count += p->count; |
| 656 | *pp = p->next; |
| 657 | break; |
| 658 | } |
| 659 | if (q == NULL) |
| 660 | pp = &p->next; |
| 661 | } |
| 662 | *pp = edir->dyn_relocs; |
| 663 | } |
| 664 | |
| 665 | edir->dyn_relocs = eind->dyn_relocs; |
| 666 | eind->dyn_relocs = NULL; |
| 667 | } |
| 668 | |
| 669 | if (ind->root.type == bfd_link_hash_indirect |
| 670 | && dir->got.refcount <= 0) |
| 671 | { |
| 672 | edir->tls_type = eind->tls_type; |
| 673 | eind->tls_type = GOT_UNKNOWN; |
| 674 | } |
| 675 | |
| 676 | if (ELIMINATE_COPY_RELOCS |
| 677 | && ind->root.type != bfd_link_hash_indirect |
| 678 | && dir->dynamic_adjusted) |
| 679 | { |
| 680 | /* If called to transfer flags for a weakdef during processing |
| 681 | of elf_adjust_dynamic_symbol, don't copy non_got_ref. |
| 682 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ |
| 683 | dir->ref_dynamic |= ind->ref_dynamic; |
| 684 | dir->ref_regular |= ind->ref_regular; |
| 685 | dir->ref_regular_nonweak |= ind->ref_regular_nonweak; |
| 686 | dir->needs_plt |= ind->needs_plt; |
| 687 | dir->pointer_equality_needed |= ind->pointer_equality_needed; |
| 688 | } |
| 689 | else |
| 690 | _bfd_elf_link_hash_copy_indirect (info, dir, ind); |
| 691 | } |
| 692 | |
| 693 | static bfd_boolean |
| 694 | elf64_x86_64_mkobject (bfd *abfd) |
| 695 | { |
| 696 | if (abfd->tdata.any == NULL) |
| 697 | { |
| 698 | bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata); |
| 699 | abfd->tdata.any = bfd_zalloc (abfd, amt); |
| 700 | if (abfd->tdata.any == NULL) |
| 701 | return FALSE; |
| 702 | } |
| 703 | return bfd_elf_mkobject (abfd); |
| 704 | } |
| 705 | |
| 706 | static bfd_boolean |
| 707 | elf64_x86_64_elf_object_p (bfd *abfd) |
| 708 | { |
| 709 | /* Set the right machine number for an x86-64 elf64 file. */ |
| 710 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); |
| 711 | return TRUE; |
| 712 | } |
| 713 | |
| 714 | static int |
| 715 | elf64_x86_64_tls_transition (struct bfd_link_info *info, int r_type, int is_local) |
| 716 | { |
| 717 | if (info->shared) |
| 718 | return r_type; |
| 719 | |
| 720 | switch (r_type) |
| 721 | { |
| 722 | case R_X86_64_TLSGD: |
| 723 | case R_X86_64_GOTPC32_TLSDESC: |
| 724 | case R_X86_64_TLSDESC_CALL: |
| 725 | case R_X86_64_GOTTPOFF: |
| 726 | if (is_local) |
| 727 | return R_X86_64_TPOFF32; |
| 728 | return R_X86_64_GOTTPOFF; |
| 729 | case R_X86_64_TLSLD: |
| 730 | return R_X86_64_TPOFF32; |
| 731 | } |
| 732 | |
| 733 | return r_type; |
| 734 | } |
| 735 | |
| 736 | /* Look through the relocs for a section during the first phase, and |
| 737 | calculate needed space in the global offset table, procedure |
| 738 | linkage table, and dynamic reloc sections. */ |
| 739 | |
| 740 | static bfd_boolean |
| 741 | elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, |
| 742 | const Elf_Internal_Rela *relocs) |
| 743 | { |
| 744 | struct elf64_x86_64_link_hash_table *htab; |
| 745 | Elf_Internal_Shdr *symtab_hdr; |
| 746 | struct elf_link_hash_entry **sym_hashes; |
| 747 | const Elf_Internal_Rela *rel; |
| 748 | const Elf_Internal_Rela *rel_end; |
| 749 | asection *sreloc; |
| 750 | |
| 751 | if (info->relocatable) |
| 752 | return TRUE; |
| 753 | |
| 754 | htab = elf64_x86_64_hash_table (info); |
| 755 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 756 | sym_hashes = elf_sym_hashes (abfd); |
| 757 | |
| 758 | sreloc = NULL; |
| 759 | |
| 760 | rel_end = relocs + sec->reloc_count; |
| 761 | for (rel = relocs; rel < rel_end; rel++) |
| 762 | { |
| 763 | unsigned int r_type; |
| 764 | unsigned long r_symndx; |
| 765 | struct elf_link_hash_entry *h; |
| 766 | |
| 767 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 768 | r_type = ELF64_R_TYPE (rel->r_info); |
| 769 | |
| 770 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 771 | { |
| 772 | (*_bfd_error_handler) (_("%B: bad symbol index: %d"), |
| 773 | abfd, r_symndx); |
| 774 | return FALSE; |
| 775 | } |
| 776 | |
| 777 | if (r_symndx < symtab_hdr->sh_info) |
| 778 | h = NULL; |
| 779 | else |
| 780 | { |
| 781 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 782 | while (h->root.type == bfd_link_hash_indirect |
| 783 | || h->root.type == bfd_link_hash_warning) |
| 784 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 785 | } |
| 786 | |
| 787 | r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL); |
| 788 | switch (r_type) |
| 789 | { |
| 790 | case R_X86_64_TLSLD: |
| 791 | htab->tls_ld_got.refcount += 1; |
| 792 | goto create_got; |
| 793 | |
| 794 | case R_X86_64_TPOFF32: |
| 795 | if (info->shared) |
| 796 | { |
| 797 | (*_bfd_error_handler) |
| 798 | (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), |
| 799 | abfd, |
| 800 | x86_64_elf_howto_table[r_type].name, |
| 801 | (h) ? h->root.root.string : "a local symbol"); |
| 802 | bfd_set_error (bfd_error_bad_value); |
| 803 | return FALSE; |
| 804 | } |
| 805 | break; |
| 806 | |
| 807 | case R_X86_64_GOTTPOFF: |
| 808 | if (info->shared) |
| 809 | info->flags |= DF_STATIC_TLS; |
| 810 | /* Fall through */ |
| 811 | |
| 812 | case R_X86_64_GOT32: |
| 813 | case R_X86_64_GOTPCREL: |
| 814 | case R_X86_64_TLSGD: |
| 815 | case R_X86_64_GOT64: |
| 816 | case R_X86_64_GOTPCREL64: |
| 817 | case R_X86_64_GOTPLT64: |
| 818 | case R_X86_64_GOTPC32_TLSDESC: |
| 819 | case R_X86_64_TLSDESC_CALL: |
| 820 | /* This symbol requires a global offset table entry. */ |
| 821 | { |
| 822 | int tls_type, old_tls_type; |
| 823 | |
| 824 | switch (r_type) |
| 825 | { |
| 826 | default: tls_type = GOT_NORMAL; break; |
| 827 | case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break; |
| 828 | case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break; |
| 829 | case R_X86_64_GOTPC32_TLSDESC: |
| 830 | case R_X86_64_TLSDESC_CALL: |
| 831 | tls_type = GOT_TLS_GDESC; break; |
| 832 | } |
| 833 | |
| 834 | if (h != NULL) |
| 835 | { |
| 836 | if (r_type == R_X86_64_GOTPLT64) |
| 837 | { |
| 838 | /* This relocation indicates that we also need |
| 839 | a PLT entry, as this is a function. We don't need |
| 840 | a PLT entry for local symbols. */ |
| 841 | h->needs_plt = 1; |
| 842 | h->plt.refcount += 1; |
| 843 | } |
| 844 | h->got.refcount += 1; |
| 845 | old_tls_type = elf64_x86_64_hash_entry (h)->tls_type; |
| 846 | } |
| 847 | else |
| 848 | { |
| 849 | bfd_signed_vma *local_got_refcounts; |
| 850 | |
| 851 | /* This is a global offset table entry for a local symbol. */ |
| 852 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 853 | if (local_got_refcounts == NULL) |
| 854 | { |
| 855 | bfd_size_type size; |
| 856 | |
| 857 | size = symtab_hdr->sh_info; |
| 858 | size *= sizeof (bfd_signed_vma) |
| 859 | + sizeof (bfd_vma) + sizeof (char); |
| 860 | local_got_refcounts = ((bfd_signed_vma *) |
| 861 | bfd_zalloc (abfd, size)); |
| 862 | if (local_got_refcounts == NULL) |
| 863 | return FALSE; |
| 864 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 865 | elf64_x86_64_local_tlsdesc_gotent (abfd) |
| 866 | = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info); |
| 867 | elf64_x86_64_local_got_tls_type (abfd) |
| 868 | = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info); |
| 869 | } |
| 870 | local_got_refcounts[r_symndx] += 1; |
| 871 | old_tls_type |
| 872 | = elf64_x86_64_local_got_tls_type (abfd) [r_symndx]; |
| 873 | } |
| 874 | |
| 875 | /* If a TLS symbol is accessed using IE at least once, |
| 876 | there is no point to use dynamic model for it. */ |
| 877 | if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN |
| 878 | && (! GOT_TLS_GD_ANY_P (old_tls_type) |
| 879 | || tls_type != GOT_TLS_IE)) |
| 880 | { |
| 881 | if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type)) |
| 882 | tls_type = old_tls_type; |
| 883 | else if (GOT_TLS_GD_ANY_P (old_tls_type) |
| 884 | && GOT_TLS_GD_ANY_P (tls_type)) |
| 885 | tls_type |= old_tls_type; |
| 886 | else |
| 887 | { |
| 888 | (*_bfd_error_handler) |
| 889 | (_("%B: %s' accessed both as normal and thread local symbol"), |
| 890 | abfd, h ? h->root.root.string : "<local>"); |
| 891 | return FALSE; |
| 892 | } |
| 893 | } |
| 894 | |
| 895 | if (old_tls_type != tls_type) |
| 896 | { |
| 897 | if (h != NULL) |
| 898 | elf64_x86_64_hash_entry (h)->tls_type = tls_type; |
| 899 | else |
| 900 | elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type; |
| 901 | } |
| 902 | } |
| 903 | /* Fall through */ |
| 904 | |
| 905 | case R_X86_64_GOTOFF64: |
| 906 | case R_X86_64_GOTPC32: |
| 907 | case R_X86_64_GOTPC64: |
| 908 | create_got: |
| 909 | if (htab->sgot == NULL) |
| 910 | { |
| 911 | if (htab->elf.dynobj == NULL) |
| 912 | htab->elf.dynobj = abfd; |
| 913 | if (!create_got_section (htab->elf.dynobj, info)) |
| 914 | return FALSE; |
| 915 | } |
| 916 | break; |
| 917 | |
| 918 | case R_X86_64_PLT32: |
| 919 | /* This symbol requires a procedure linkage table entry. We |
| 920 | actually build the entry in adjust_dynamic_symbol, |
| 921 | because this might be a case of linking PIC code which is |
| 922 | never referenced by a dynamic object, in which case we |
| 923 | don't need to generate a procedure linkage table entry |
| 924 | after all. */ |
| 925 | |
| 926 | /* If this is a local symbol, we resolve it directly without |
| 927 | creating a procedure linkage table entry. */ |
| 928 | if (h == NULL) |
| 929 | continue; |
| 930 | |
| 931 | h->needs_plt = 1; |
| 932 | h->plt.refcount += 1; |
| 933 | break; |
| 934 | |
| 935 | case R_X86_64_PLTOFF64: |
| 936 | /* This tries to form the 'address' of a function relative |
| 937 | to GOT. For global symbols we need a PLT entry. */ |
| 938 | if (h != NULL) |
| 939 | { |
| 940 | h->needs_plt = 1; |
| 941 | h->plt.refcount += 1; |
| 942 | } |
| 943 | goto create_got; |
| 944 | |
| 945 | case R_X86_64_8: |
| 946 | case R_X86_64_16: |
| 947 | case R_X86_64_32: |
| 948 | case R_X86_64_32S: |
| 949 | /* Let's help debug shared library creation. These relocs |
| 950 | cannot be used in shared libs. Don't error out for |
| 951 | sections we don't care about, such as debug sections or |
| 952 | non-constant sections. */ |
| 953 | if (info->shared |
| 954 | && (sec->flags & SEC_ALLOC) != 0 |
| 955 | && (sec->flags & SEC_READONLY) != 0) |
| 956 | { |
| 957 | (*_bfd_error_handler) |
| 958 | (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), |
| 959 | abfd, |
| 960 | x86_64_elf_howto_table[r_type].name, |
| 961 | (h) ? h->root.root.string : "a local symbol"); |
| 962 | bfd_set_error (bfd_error_bad_value); |
| 963 | return FALSE; |
| 964 | } |
| 965 | /* Fall through. */ |
| 966 | |
| 967 | case R_X86_64_PC8: |
| 968 | case R_X86_64_PC16: |
| 969 | case R_X86_64_PC32: |
| 970 | case R_X86_64_PC64: |
| 971 | case R_X86_64_64: |
| 972 | if (h != NULL && !info->shared) |
| 973 | { |
| 974 | /* If this reloc is in a read-only section, we might |
| 975 | need a copy reloc. We can't check reliably at this |
| 976 | stage whether the section is read-only, as input |
| 977 | sections have not yet been mapped to output sections. |
| 978 | Tentatively set the flag for now, and correct in |
| 979 | adjust_dynamic_symbol. */ |
| 980 | h->non_got_ref = 1; |
| 981 | |
| 982 | /* We may need a .plt entry if the function this reloc |
| 983 | refers to is in a shared lib. */ |
| 984 | h->plt.refcount += 1; |
| 985 | if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64) |
| 986 | h->pointer_equality_needed = 1; |
| 987 | } |
| 988 | |
| 989 | /* If we are creating a shared library, and this is a reloc |
| 990 | against a global symbol, or a non PC relative reloc |
| 991 | against a local symbol, then we need to copy the reloc |
| 992 | into the shared library. However, if we are linking with |
| 993 | -Bsymbolic, we do not need to copy a reloc against a |
| 994 | global symbol which is defined in an object we are |
| 995 | including in the link (i.e., DEF_REGULAR is set). At |
| 996 | this point we have not seen all the input files, so it is |
| 997 | possible that DEF_REGULAR is not set now but will be set |
| 998 | later (it is never cleared). In case of a weak definition, |
| 999 | DEF_REGULAR may be cleared later by a strong definition in |
| 1000 | a shared library. We account for that possibility below by |
| 1001 | storing information in the relocs_copied field of the hash |
| 1002 | table entry. A similar situation occurs when creating |
| 1003 | shared libraries and symbol visibility changes render the |
| 1004 | symbol local. |
| 1005 | |
| 1006 | If on the other hand, we are creating an executable, we |
| 1007 | may need to keep relocations for symbols satisfied by a |
| 1008 | dynamic library if we manage to avoid copy relocs for the |
| 1009 | symbol. */ |
| 1010 | if ((info->shared |
| 1011 | && (sec->flags & SEC_ALLOC) != 0 |
| 1012 | && (((r_type != R_X86_64_PC8) |
| 1013 | && (r_type != R_X86_64_PC16) |
| 1014 | && (r_type != R_X86_64_PC32) |
| 1015 | && (r_type != R_X86_64_PC64)) |
| 1016 | || (h != NULL |
| 1017 | && (! SYMBOLIC_BIND (info, h) |
| 1018 | || h->root.type == bfd_link_hash_defweak |
| 1019 | || !h->def_regular)))) |
| 1020 | || (ELIMINATE_COPY_RELOCS |
| 1021 | && !info->shared |
| 1022 | && (sec->flags & SEC_ALLOC) != 0 |
| 1023 | && h != NULL |
| 1024 | && (h->root.type == bfd_link_hash_defweak |
| 1025 | || !h->def_regular))) |
| 1026 | { |
| 1027 | struct elf64_x86_64_dyn_relocs *p; |
| 1028 | struct elf64_x86_64_dyn_relocs **head; |
| 1029 | |
| 1030 | /* We must copy these reloc types into the output file. |
| 1031 | Create a reloc section in dynobj and make room for |
| 1032 | this reloc. */ |
| 1033 | if (sreloc == NULL) |
| 1034 | { |
| 1035 | const char *name; |
| 1036 | bfd *dynobj; |
| 1037 | |
| 1038 | name = (bfd_elf_string_from_elf_section |
| 1039 | (abfd, |
| 1040 | elf_elfheader (abfd)->e_shstrndx, |
| 1041 | elf_section_data (sec)->rel_hdr.sh_name)); |
| 1042 | if (name == NULL) |
| 1043 | return FALSE; |
| 1044 | |
| 1045 | if (! CONST_STRNEQ (name, ".rela") |
| 1046 | || strcmp (bfd_get_section_name (abfd, sec), |
| 1047 | name + 5) != 0) |
| 1048 | { |
| 1049 | (*_bfd_error_handler) |
| 1050 | (_("%B: bad relocation section name `%s\'"), |
| 1051 | abfd, name); |
| 1052 | } |
| 1053 | |
| 1054 | if (htab->elf.dynobj == NULL) |
| 1055 | htab->elf.dynobj = abfd; |
| 1056 | |
| 1057 | dynobj = htab->elf.dynobj; |
| 1058 | |
| 1059 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 1060 | if (sreloc == NULL) |
| 1061 | { |
| 1062 | flagword flags; |
| 1063 | |
| 1064 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 1065 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 1066 | if ((sec->flags & SEC_ALLOC) != 0) |
| 1067 | flags |= SEC_ALLOC | SEC_LOAD; |
| 1068 | sreloc = bfd_make_section_with_flags (dynobj, |
| 1069 | name, |
| 1070 | flags); |
| 1071 | if (sreloc == NULL |
| 1072 | || ! bfd_set_section_alignment (dynobj, sreloc, 3)) |
| 1073 | return FALSE; |
| 1074 | } |
| 1075 | elf_section_data (sec)->sreloc = sreloc; |
| 1076 | } |
| 1077 | |
| 1078 | /* If this is a global symbol, we count the number of |
| 1079 | relocations we need for this symbol. */ |
| 1080 | if (h != NULL) |
| 1081 | { |
| 1082 | head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs; |
| 1083 | } |
| 1084 | else |
| 1085 | { |
| 1086 | void **vpp; |
| 1087 | /* Track dynamic relocs needed for local syms too. |
| 1088 | We really need local syms available to do this |
| 1089 | easily. Oh well. */ |
| 1090 | |
| 1091 | asection *s; |
| 1092 | s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, |
| 1093 | sec, r_symndx); |
| 1094 | if (s == NULL) |
| 1095 | return FALSE; |
| 1096 | |
| 1097 | /* Beware of type punned pointers vs strict aliasing |
| 1098 | rules. */ |
| 1099 | vpp = &(elf_section_data (s)->local_dynrel); |
| 1100 | head = (struct elf64_x86_64_dyn_relocs **)vpp; |
| 1101 | } |
| 1102 | |
| 1103 | p = *head; |
| 1104 | if (p == NULL || p->sec != sec) |
| 1105 | { |
| 1106 | bfd_size_type amt = sizeof *p; |
| 1107 | p = ((struct elf64_x86_64_dyn_relocs *) |
| 1108 | bfd_alloc (htab->elf.dynobj, amt)); |
| 1109 | if (p == NULL) |
| 1110 | return FALSE; |
| 1111 | p->next = *head; |
| 1112 | *head = p; |
| 1113 | p->sec = sec; |
| 1114 | p->count = 0; |
| 1115 | p->pc_count = 0; |
| 1116 | } |
| 1117 | |
| 1118 | p->count += 1; |
| 1119 | if (r_type == R_X86_64_PC8 |
| 1120 | || r_type == R_X86_64_PC16 |
| 1121 | || r_type == R_X86_64_PC32 |
| 1122 | || r_type == R_X86_64_PC64) |
| 1123 | p->pc_count += 1; |
| 1124 | } |
| 1125 | break; |
| 1126 | |
| 1127 | /* This relocation describes the C++ object vtable hierarchy. |
| 1128 | Reconstruct it for later use during GC. */ |
| 1129 | case R_X86_64_GNU_VTINHERIT: |
| 1130 | if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 1131 | return FALSE; |
| 1132 | break; |
| 1133 | |
| 1134 | /* This relocation describes which C++ vtable entries are actually |
| 1135 | used. Record for later use during GC. */ |
| 1136 | case R_X86_64_GNU_VTENTRY: |
| 1137 | if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 1138 | return FALSE; |
| 1139 | break; |
| 1140 | |
| 1141 | default: |
| 1142 | break; |
| 1143 | } |
| 1144 | } |
| 1145 | |
| 1146 | return TRUE; |
| 1147 | } |
| 1148 | |
| 1149 | /* Return the section that should be marked against GC for a given |
| 1150 | relocation. */ |
| 1151 | |
| 1152 | static asection * |
| 1153 | elf64_x86_64_gc_mark_hook (asection *sec, |
| 1154 | struct bfd_link_info *info, |
| 1155 | Elf_Internal_Rela *rel, |
| 1156 | struct elf_link_hash_entry *h, |
| 1157 | Elf_Internal_Sym *sym) |
| 1158 | { |
| 1159 | if (h != NULL) |
| 1160 | switch (ELF64_R_TYPE (rel->r_info)) |
| 1161 | { |
| 1162 | case R_X86_64_GNU_VTINHERIT: |
| 1163 | case R_X86_64_GNU_VTENTRY: |
| 1164 | return NULL; |
| 1165 | } |
| 1166 | |
| 1167 | return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); |
| 1168 | } |
| 1169 | |
| 1170 | /* Update the got entry reference counts for the section being removed. */ |
| 1171 | |
| 1172 | static bfd_boolean |
| 1173 | elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, |
| 1174 | asection *sec, const Elf_Internal_Rela *relocs) |
| 1175 | { |
| 1176 | Elf_Internal_Shdr *symtab_hdr; |
| 1177 | struct elf_link_hash_entry **sym_hashes; |
| 1178 | bfd_signed_vma *local_got_refcounts; |
| 1179 | const Elf_Internal_Rela *rel, *relend; |
| 1180 | |
| 1181 | elf_section_data (sec)->local_dynrel = NULL; |
| 1182 | |
| 1183 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1184 | sym_hashes = elf_sym_hashes (abfd); |
| 1185 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1186 | |
| 1187 | relend = relocs + sec->reloc_count; |
| 1188 | for (rel = relocs; rel < relend; rel++) |
| 1189 | { |
| 1190 | unsigned long r_symndx; |
| 1191 | unsigned int r_type; |
| 1192 | struct elf_link_hash_entry *h = NULL; |
| 1193 | |
| 1194 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 1195 | if (r_symndx >= symtab_hdr->sh_info) |
| 1196 | { |
| 1197 | struct elf64_x86_64_link_hash_entry *eh; |
| 1198 | struct elf64_x86_64_dyn_relocs **pp; |
| 1199 | struct elf64_x86_64_dyn_relocs *p; |
| 1200 | |
| 1201 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1202 | while (h->root.type == bfd_link_hash_indirect |
| 1203 | || h->root.type == bfd_link_hash_warning) |
| 1204 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1205 | eh = (struct elf64_x86_64_link_hash_entry *) h; |
| 1206 | |
| 1207 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| 1208 | if (p->sec == sec) |
| 1209 | { |
| 1210 | /* Everything must go for SEC. */ |
| 1211 | *pp = p->next; |
| 1212 | break; |
| 1213 | } |
| 1214 | } |
| 1215 | |
| 1216 | r_type = ELF64_R_TYPE (rel->r_info); |
| 1217 | r_type = elf64_x86_64_tls_transition (info, r_type, h != NULL); |
| 1218 | switch (r_type) |
| 1219 | { |
| 1220 | case R_X86_64_TLSLD: |
| 1221 | if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0) |
| 1222 | elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1; |
| 1223 | break; |
| 1224 | |
| 1225 | case R_X86_64_TLSGD: |
| 1226 | case R_X86_64_GOTPC32_TLSDESC: |
| 1227 | case R_X86_64_TLSDESC_CALL: |
| 1228 | case R_X86_64_GOTTPOFF: |
| 1229 | case R_X86_64_GOT32: |
| 1230 | case R_X86_64_GOTPCREL: |
| 1231 | case R_X86_64_GOT64: |
| 1232 | case R_X86_64_GOTPCREL64: |
| 1233 | case R_X86_64_GOTPLT64: |
| 1234 | if (h != NULL) |
| 1235 | { |
| 1236 | if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0) |
| 1237 | h->plt.refcount -= 1; |
| 1238 | if (h->got.refcount > 0) |
| 1239 | h->got.refcount -= 1; |
| 1240 | } |
| 1241 | else if (local_got_refcounts != NULL) |
| 1242 | { |
| 1243 | if (local_got_refcounts[r_symndx] > 0) |
| 1244 | local_got_refcounts[r_symndx] -= 1; |
| 1245 | } |
| 1246 | break; |
| 1247 | |
| 1248 | case R_X86_64_8: |
| 1249 | case R_X86_64_16: |
| 1250 | case R_X86_64_32: |
| 1251 | case R_X86_64_64: |
| 1252 | case R_X86_64_32S: |
| 1253 | case R_X86_64_PC8: |
| 1254 | case R_X86_64_PC16: |
| 1255 | case R_X86_64_PC32: |
| 1256 | case R_X86_64_PC64: |
| 1257 | if (info->shared) |
| 1258 | break; |
| 1259 | /* Fall thru */ |
| 1260 | |
| 1261 | case R_X86_64_PLT32: |
| 1262 | case R_X86_64_PLTOFF64: |
| 1263 | if (h != NULL) |
| 1264 | { |
| 1265 | if (h->plt.refcount > 0) |
| 1266 | h->plt.refcount -= 1; |
| 1267 | } |
| 1268 | break; |
| 1269 | |
| 1270 | default: |
| 1271 | break; |
| 1272 | } |
| 1273 | } |
| 1274 | |
| 1275 | return TRUE; |
| 1276 | } |
| 1277 | |
| 1278 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 1279 | regular object. The current definition is in some section of the |
| 1280 | dynamic object, but we're not including those sections. We have to |
| 1281 | change the definition to something the rest of the link can |
| 1282 | understand. */ |
| 1283 | |
| 1284 | static bfd_boolean |
| 1285 | elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info, |
| 1286 | struct elf_link_hash_entry *h) |
| 1287 | { |
| 1288 | struct elf64_x86_64_link_hash_table *htab; |
| 1289 | asection *s; |
| 1290 | |
| 1291 | /* If this is a function, put it in the procedure linkage table. We |
| 1292 | will fill in the contents of the procedure linkage table later, |
| 1293 | when we know the address of the .got section. */ |
| 1294 | if (h->type == STT_FUNC |
| 1295 | || h->needs_plt) |
| 1296 | { |
| 1297 | if (h->plt.refcount <= 0 |
| 1298 | || SYMBOL_CALLS_LOCAL (info, h) |
| 1299 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 1300 | && h->root.type == bfd_link_hash_undefweak)) |
| 1301 | { |
| 1302 | /* This case can occur if we saw a PLT32 reloc in an input |
| 1303 | file, but the symbol was never referred to by a dynamic |
| 1304 | object, or if all references were garbage collected. In |
| 1305 | such a case, we don't actually need to build a procedure |
| 1306 | linkage table, and we can just do a PC32 reloc instead. */ |
| 1307 | h->plt.offset = (bfd_vma) -1; |
| 1308 | h->needs_plt = 0; |
| 1309 | } |
| 1310 | |
| 1311 | return TRUE; |
| 1312 | } |
| 1313 | else |
| 1314 | /* It's possible that we incorrectly decided a .plt reloc was |
| 1315 | needed for an R_X86_64_PC32 reloc to a non-function sym in |
| 1316 | check_relocs. We can't decide accurately between function and |
| 1317 | non-function syms in check-relocs; Objects loaded later in |
| 1318 | the link may change h->type. So fix it now. */ |
| 1319 | h->plt.offset = (bfd_vma) -1; |
| 1320 | |
| 1321 | /* If this is a weak symbol, and there is a real definition, the |
| 1322 | processor independent code will have arranged for us to see the |
| 1323 | real definition first, and we can just use the same value. */ |
| 1324 | if (h->u.weakdef != NULL) |
| 1325 | { |
| 1326 | BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined |
| 1327 | || h->u.weakdef->root.type == bfd_link_hash_defweak); |
| 1328 | h->root.u.def.section = h->u.weakdef->root.u.def.section; |
| 1329 | h->root.u.def.value = h->u.weakdef->root.u.def.value; |
| 1330 | if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) |
| 1331 | h->non_got_ref = h->u.weakdef->non_got_ref; |
| 1332 | return TRUE; |
| 1333 | } |
| 1334 | |
| 1335 | /* This is a reference to a symbol defined by a dynamic object which |
| 1336 | is not a function. */ |
| 1337 | |
| 1338 | /* If we are creating a shared library, we must presume that the |
| 1339 | only references to the symbol are via the global offset table. |
| 1340 | For such cases we need not do anything here; the relocations will |
| 1341 | be handled correctly by relocate_section. */ |
| 1342 | if (info->shared) |
| 1343 | return TRUE; |
| 1344 | |
| 1345 | /* If there are no references to this symbol that do not use the |
| 1346 | GOT, we don't need to generate a copy reloc. */ |
| 1347 | if (!h->non_got_ref) |
| 1348 | return TRUE; |
| 1349 | |
| 1350 | /* If -z nocopyreloc was given, we won't generate them either. */ |
| 1351 | if (info->nocopyreloc) |
| 1352 | { |
| 1353 | h->non_got_ref = 0; |
| 1354 | return TRUE; |
| 1355 | } |
| 1356 | |
| 1357 | if (ELIMINATE_COPY_RELOCS) |
| 1358 | { |
| 1359 | struct elf64_x86_64_link_hash_entry * eh; |
| 1360 | struct elf64_x86_64_dyn_relocs *p; |
| 1361 | |
| 1362 | eh = (struct elf64_x86_64_link_hash_entry *) h; |
| 1363 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1364 | { |
| 1365 | s = p->sec->output_section; |
| 1366 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1367 | break; |
| 1368 | } |
| 1369 | |
| 1370 | /* If we didn't find any dynamic relocs in read-only sections, then |
| 1371 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
| 1372 | if (p == NULL) |
| 1373 | { |
| 1374 | h->non_got_ref = 0; |
| 1375 | return TRUE; |
| 1376 | } |
| 1377 | } |
| 1378 | |
| 1379 | if (h->size == 0) |
| 1380 | { |
| 1381 | (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), |
| 1382 | h->root.root.string); |
| 1383 | return TRUE; |
| 1384 | } |
| 1385 | |
| 1386 | /* We must allocate the symbol in our .dynbss section, which will |
| 1387 | become part of the .bss section of the executable. There will be |
| 1388 | an entry for this symbol in the .dynsym section. The dynamic |
| 1389 | object will contain position independent code, so all references |
| 1390 | from the dynamic object to this symbol will go through the global |
| 1391 | offset table. The dynamic linker will use the .dynsym entry to |
| 1392 | determine the address it must put in the global offset table, so |
| 1393 | both the dynamic object and the regular object will refer to the |
| 1394 | same memory location for the variable. */ |
| 1395 | |
| 1396 | htab = elf64_x86_64_hash_table (info); |
| 1397 | |
| 1398 | /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker |
| 1399 | to copy the initial value out of the dynamic object and into the |
| 1400 | runtime process image. */ |
| 1401 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 1402 | { |
| 1403 | htab->srelbss->size += sizeof (Elf64_External_Rela); |
| 1404 | h->needs_copy = 1; |
| 1405 | } |
| 1406 | |
| 1407 | s = htab->sdynbss; |
| 1408 | |
| 1409 | return _bfd_elf_adjust_dynamic_copy (h, s); |
| 1410 | } |
| 1411 | |
| 1412 | /* Allocate space in .plt, .got and associated reloc sections for |
| 1413 | dynamic relocs. */ |
| 1414 | |
| 1415 | static bfd_boolean |
| 1416 | allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) |
| 1417 | { |
| 1418 | struct bfd_link_info *info; |
| 1419 | struct elf64_x86_64_link_hash_table *htab; |
| 1420 | struct elf64_x86_64_link_hash_entry *eh; |
| 1421 | struct elf64_x86_64_dyn_relocs *p; |
| 1422 | |
| 1423 | if (h->root.type == bfd_link_hash_indirect) |
| 1424 | return TRUE; |
| 1425 | |
| 1426 | if (h->root.type == bfd_link_hash_warning) |
| 1427 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1428 | |
| 1429 | info = (struct bfd_link_info *) inf; |
| 1430 | htab = elf64_x86_64_hash_table (info); |
| 1431 | |
| 1432 | if (htab->elf.dynamic_sections_created |
| 1433 | && h->plt.refcount > 0) |
| 1434 | { |
| 1435 | /* Make sure this symbol is output as a dynamic symbol. |
| 1436 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1437 | if (h->dynindx == -1 |
| 1438 | && !h->forced_local) |
| 1439 | { |
| 1440 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1441 | return FALSE; |
| 1442 | } |
| 1443 | |
| 1444 | if (info->shared |
| 1445 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) |
| 1446 | { |
| 1447 | asection *s = htab->splt; |
| 1448 | |
| 1449 | /* If this is the first .plt entry, make room for the special |
| 1450 | first entry. */ |
| 1451 | if (s->size == 0) |
| 1452 | s->size += PLT_ENTRY_SIZE; |
| 1453 | |
| 1454 | h->plt.offset = s->size; |
| 1455 | |
| 1456 | /* If this symbol is not defined in a regular file, and we are |
| 1457 | not generating a shared library, then set the symbol to this |
| 1458 | location in the .plt. This is required to make function |
| 1459 | pointers compare as equal between the normal executable and |
| 1460 | the shared library. */ |
| 1461 | if (! info->shared |
| 1462 | && !h->def_regular) |
| 1463 | { |
| 1464 | h->root.u.def.section = s; |
| 1465 | h->root.u.def.value = h->plt.offset; |
| 1466 | } |
| 1467 | |
| 1468 | /* Make room for this entry. */ |
| 1469 | s->size += PLT_ENTRY_SIZE; |
| 1470 | |
| 1471 | /* We also need to make an entry in the .got.plt section, which |
| 1472 | will be placed in the .got section by the linker script. */ |
| 1473 | htab->sgotplt->size += GOT_ENTRY_SIZE; |
| 1474 | |
| 1475 | /* We also need to make an entry in the .rela.plt section. */ |
| 1476 | htab->srelplt->size += sizeof (Elf64_External_Rela); |
| 1477 | htab->srelplt->reloc_count++; |
| 1478 | } |
| 1479 | else |
| 1480 | { |
| 1481 | h->plt.offset = (bfd_vma) -1; |
| 1482 | h->needs_plt = 0; |
| 1483 | } |
| 1484 | } |
| 1485 | else |
| 1486 | { |
| 1487 | h->plt.offset = (bfd_vma) -1; |
| 1488 | h->needs_plt = 0; |
| 1489 | } |
| 1490 | |
| 1491 | eh = (struct elf64_x86_64_link_hash_entry *) h; |
| 1492 | eh->tlsdesc_got = (bfd_vma) -1; |
| 1493 | |
| 1494 | /* If R_X86_64_GOTTPOFF symbol is now local to the binary, |
| 1495 | make it a R_X86_64_TPOFF32 requiring no GOT entry. */ |
| 1496 | if (h->got.refcount > 0 |
| 1497 | && !info->shared |
| 1498 | && h->dynindx == -1 |
| 1499 | && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE) |
| 1500 | h->got.offset = (bfd_vma) -1; |
| 1501 | else if (h->got.refcount > 0) |
| 1502 | { |
| 1503 | asection *s; |
| 1504 | bfd_boolean dyn; |
| 1505 | int tls_type = elf64_x86_64_hash_entry (h)->tls_type; |
| 1506 | |
| 1507 | /* Make sure this symbol is output as a dynamic symbol. |
| 1508 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1509 | if (h->dynindx == -1 |
| 1510 | && !h->forced_local) |
| 1511 | { |
| 1512 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1513 | return FALSE; |
| 1514 | } |
| 1515 | |
| 1516 | if (GOT_TLS_GDESC_P (tls_type)) |
| 1517 | { |
| 1518 | eh->tlsdesc_got = htab->sgotplt->size |
| 1519 | - elf64_x86_64_compute_jump_table_size (htab); |
| 1520 | htab->sgotplt->size += 2 * GOT_ENTRY_SIZE; |
| 1521 | h->got.offset = (bfd_vma) -2; |
| 1522 | } |
| 1523 | if (! GOT_TLS_GDESC_P (tls_type) |
| 1524 | || GOT_TLS_GD_P (tls_type)) |
| 1525 | { |
| 1526 | s = htab->sgot; |
| 1527 | h->got.offset = s->size; |
| 1528 | s->size += GOT_ENTRY_SIZE; |
| 1529 | if (GOT_TLS_GD_P (tls_type)) |
| 1530 | s->size += GOT_ENTRY_SIZE; |
| 1531 | } |
| 1532 | dyn = htab->elf.dynamic_sections_created; |
| 1533 | /* R_X86_64_TLSGD needs one dynamic relocation if local symbol |
| 1534 | and two if global. |
| 1535 | R_X86_64_GOTTPOFF needs one dynamic relocation. */ |
| 1536 | if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) |
| 1537 | || tls_type == GOT_TLS_IE) |
| 1538 | htab->srelgot->size += sizeof (Elf64_External_Rela); |
| 1539 | else if (GOT_TLS_GD_P (tls_type)) |
| 1540 | htab->srelgot->size += 2 * sizeof (Elf64_External_Rela); |
| 1541 | else if (! GOT_TLS_GDESC_P (tls_type) |
| 1542 | && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 1543 | || h->root.type != bfd_link_hash_undefweak) |
| 1544 | && (info->shared |
| 1545 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) |
| 1546 | htab->srelgot->size += sizeof (Elf64_External_Rela); |
| 1547 | if (GOT_TLS_GDESC_P (tls_type)) |
| 1548 | { |
| 1549 | htab->srelplt->size += sizeof (Elf64_External_Rela); |
| 1550 | htab->tlsdesc_plt = (bfd_vma) -1; |
| 1551 | } |
| 1552 | } |
| 1553 | else |
| 1554 | h->got.offset = (bfd_vma) -1; |
| 1555 | |
| 1556 | if (eh->dyn_relocs == NULL) |
| 1557 | return TRUE; |
| 1558 | |
| 1559 | /* In the shared -Bsymbolic case, discard space allocated for |
| 1560 | dynamic pc-relative relocs against symbols which turn out to be |
| 1561 | defined in regular objects. For the normal shared case, discard |
| 1562 | space for pc-relative relocs that have become local due to symbol |
| 1563 | visibility changes. */ |
| 1564 | |
| 1565 | if (info->shared) |
| 1566 | { |
| 1567 | /* Relocs that use pc_count are those that appear on a call |
| 1568 | insn, or certain REL relocs that can generated via assembly. |
| 1569 | We want calls to protected symbols to resolve directly to the |
| 1570 | function rather than going via the plt. If people want |
| 1571 | function pointer comparisons to work as expected then they |
| 1572 | should avoid writing weird assembly. */ |
| 1573 | if (SYMBOL_CALLS_LOCAL (info, h)) |
| 1574 | { |
| 1575 | struct elf64_x86_64_dyn_relocs **pp; |
| 1576 | |
| 1577 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 1578 | { |
| 1579 | p->count -= p->pc_count; |
| 1580 | p->pc_count = 0; |
| 1581 | if (p->count == 0) |
| 1582 | *pp = p->next; |
| 1583 | else |
| 1584 | pp = &p->next; |
| 1585 | } |
| 1586 | } |
| 1587 | |
| 1588 | /* Also discard relocs on undefined weak syms with non-default |
| 1589 | visibility. */ |
| 1590 | if (eh->dyn_relocs != NULL |
| 1591 | && h->root.type == bfd_link_hash_undefweak) |
| 1592 | { |
| 1593 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
| 1594 | eh->dyn_relocs = NULL; |
| 1595 | |
| 1596 | /* Make sure undefined weak symbols are output as a dynamic |
| 1597 | symbol in PIEs. */ |
| 1598 | else if (h->dynindx == -1 |
| 1599 | && !h->forced_local) |
| 1600 | { |
| 1601 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1602 | return FALSE; |
| 1603 | } |
| 1604 | } |
| 1605 | } |
| 1606 | else if (ELIMINATE_COPY_RELOCS) |
| 1607 | { |
| 1608 | /* For the non-shared case, discard space for relocs against |
| 1609 | symbols which turn out to need copy relocs or are not |
| 1610 | dynamic. */ |
| 1611 | |
| 1612 | if (!h->non_got_ref |
| 1613 | && ((h->def_dynamic |
| 1614 | && !h->def_regular) |
| 1615 | || (htab->elf.dynamic_sections_created |
| 1616 | && (h->root.type == bfd_link_hash_undefweak |
| 1617 | || h->root.type == bfd_link_hash_undefined)))) |
| 1618 | { |
| 1619 | /* Make sure this symbol is output as a dynamic symbol. |
| 1620 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1621 | if (h->dynindx == -1 |
| 1622 | && !h->forced_local) |
| 1623 | { |
| 1624 | if (! bfd_elf_link_record_dynamic_symbol (info, h)) |
| 1625 | return FALSE; |
| 1626 | } |
| 1627 | |
| 1628 | /* If that succeeded, we know we'll be keeping all the |
| 1629 | relocs. */ |
| 1630 | if (h->dynindx != -1) |
| 1631 | goto keep; |
| 1632 | } |
| 1633 | |
| 1634 | eh->dyn_relocs = NULL; |
| 1635 | |
| 1636 | keep: ; |
| 1637 | } |
| 1638 | |
| 1639 | /* Finally, allocate space. */ |
| 1640 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1641 | { |
| 1642 | asection *sreloc = elf_section_data (p->sec)->sreloc; |
| 1643 | sreloc->size += p->count * sizeof (Elf64_External_Rela); |
| 1644 | } |
| 1645 | |
| 1646 | return TRUE; |
| 1647 | } |
| 1648 | |
| 1649 | /* Find any dynamic relocs that apply to read-only sections. */ |
| 1650 | |
| 1651 | static bfd_boolean |
| 1652 | readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf) |
| 1653 | { |
| 1654 | struct elf64_x86_64_link_hash_entry *eh; |
| 1655 | struct elf64_x86_64_dyn_relocs *p; |
| 1656 | |
| 1657 | if (h->root.type == bfd_link_hash_warning) |
| 1658 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1659 | |
| 1660 | eh = (struct elf64_x86_64_link_hash_entry *) h; |
| 1661 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1662 | { |
| 1663 | asection *s = p->sec->output_section; |
| 1664 | |
| 1665 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1666 | { |
| 1667 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 1668 | |
| 1669 | info->flags |= DF_TEXTREL; |
| 1670 | |
| 1671 | /* Not an error, just cut short the traversal. */ |
| 1672 | return FALSE; |
| 1673 | } |
| 1674 | } |
| 1675 | return TRUE; |
| 1676 | } |
| 1677 | |
| 1678 | /* Set the sizes of the dynamic sections. */ |
| 1679 | |
| 1680 | static bfd_boolean |
| 1681 | elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 1682 | struct bfd_link_info *info) |
| 1683 | { |
| 1684 | struct elf64_x86_64_link_hash_table *htab; |
| 1685 | bfd *dynobj; |
| 1686 | asection *s; |
| 1687 | bfd_boolean relocs; |
| 1688 | bfd *ibfd; |
| 1689 | |
| 1690 | htab = elf64_x86_64_hash_table (info); |
| 1691 | dynobj = htab->elf.dynobj; |
| 1692 | if (dynobj == NULL) |
| 1693 | abort (); |
| 1694 | |
| 1695 | if (htab->elf.dynamic_sections_created) |
| 1696 | { |
| 1697 | /* Set the contents of the .interp section to the interpreter. */ |
| 1698 | if (info->executable) |
| 1699 | { |
| 1700 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 1701 | if (s == NULL) |
| 1702 | abort (); |
| 1703 | s->size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 1704 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 1705 | } |
| 1706 | } |
| 1707 | |
| 1708 | /* Set up .got offsets for local syms, and space for local dynamic |
| 1709 | relocs. */ |
| 1710 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 1711 | { |
| 1712 | bfd_signed_vma *local_got; |
| 1713 | bfd_signed_vma *end_local_got; |
| 1714 | char *local_tls_type; |
| 1715 | bfd_vma *local_tlsdesc_gotent; |
| 1716 | bfd_size_type locsymcount; |
| 1717 | Elf_Internal_Shdr *symtab_hdr; |
| 1718 | asection *srel; |
| 1719 | |
| 1720 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| 1721 | continue; |
| 1722 | |
| 1723 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 1724 | { |
| 1725 | struct elf64_x86_64_dyn_relocs *p; |
| 1726 | |
| 1727 | for (p = (struct elf64_x86_64_dyn_relocs *) |
| 1728 | (elf_section_data (s)->local_dynrel); |
| 1729 | p != NULL; |
| 1730 | p = p->next) |
| 1731 | { |
| 1732 | if (!bfd_is_abs_section (p->sec) |
| 1733 | && bfd_is_abs_section (p->sec->output_section)) |
| 1734 | { |
| 1735 | /* Input section has been discarded, either because |
| 1736 | it is a copy of a linkonce section or due to |
| 1737 | linker script /DISCARD/, so we'll be discarding |
| 1738 | the relocs too. */ |
| 1739 | } |
| 1740 | else if (p->count != 0) |
| 1741 | { |
| 1742 | srel = elf_section_data (p->sec)->sreloc; |
| 1743 | srel->size += p->count * sizeof (Elf64_External_Rela); |
| 1744 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) |
| 1745 | info->flags |= DF_TEXTREL; |
| 1746 | |
| 1747 | } |
| 1748 | } |
| 1749 | } |
| 1750 | |
| 1751 | local_got = elf_local_got_refcounts (ibfd); |
| 1752 | if (!local_got) |
| 1753 | continue; |
| 1754 | |
| 1755 | symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; |
| 1756 | locsymcount = symtab_hdr->sh_info; |
| 1757 | end_local_got = local_got + locsymcount; |
| 1758 | local_tls_type = elf64_x86_64_local_got_tls_type (ibfd); |
| 1759 | local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd); |
| 1760 | s = htab->sgot; |
| 1761 | srel = htab->srelgot; |
| 1762 | for (; local_got < end_local_got; |
| 1763 | ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) |
| 1764 | { |
| 1765 | *local_tlsdesc_gotent = (bfd_vma) -1; |
| 1766 | if (*local_got > 0) |
| 1767 | { |
| 1768 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 1769 | { |
| 1770 | *local_tlsdesc_gotent = htab->sgotplt->size |
| 1771 | - elf64_x86_64_compute_jump_table_size (htab); |
| 1772 | htab->sgotplt->size += 2 * GOT_ENTRY_SIZE; |
| 1773 | *local_got = (bfd_vma) -2; |
| 1774 | } |
| 1775 | if (! GOT_TLS_GDESC_P (*local_tls_type) |
| 1776 | || GOT_TLS_GD_P (*local_tls_type)) |
| 1777 | { |
| 1778 | *local_got = s->size; |
| 1779 | s->size += GOT_ENTRY_SIZE; |
| 1780 | if (GOT_TLS_GD_P (*local_tls_type)) |
| 1781 | s->size += GOT_ENTRY_SIZE; |
| 1782 | } |
| 1783 | if (info->shared |
| 1784 | || GOT_TLS_GD_ANY_P (*local_tls_type) |
| 1785 | || *local_tls_type == GOT_TLS_IE) |
| 1786 | { |
| 1787 | if (GOT_TLS_GDESC_P (*local_tls_type)) |
| 1788 | { |
| 1789 | htab->srelplt->size += sizeof (Elf64_External_Rela); |
| 1790 | htab->tlsdesc_plt = (bfd_vma) -1; |
| 1791 | } |
| 1792 | if (! GOT_TLS_GDESC_P (*local_tls_type) |
| 1793 | || GOT_TLS_GD_P (*local_tls_type)) |
| 1794 | srel->size += sizeof (Elf64_External_Rela); |
| 1795 | } |
| 1796 | } |
| 1797 | else |
| 1798 | *local_got = (bfd_vma) -1; |
| 1799 | } |
| 1800 | } |
| 1801 | |
| 1802 | if (htab->tls_ld_got.refcount > 0) |
| 1803 | { |
| 1804 | /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD |
| 1805 | relocs. */ |
| 1806 | htab->tls_ld_got.offset = htab->sgot->size; |
| 1807 | htab->sgot->size += 2 * GOT_ENTRY_SIZE; |
| 1808 | htab->srelgot->size += sizeof (Elf64_External_Rela); |
| 1809 | } |
| 1810 | else |
| 1811 | htab->tls_ld_got.offset = -1; |
| 1812 | |
| 1813 | /* Allocate global sym .plt and .got entries, and space for global |
| 1814 | sym dynamic relocs. */ |
| 1815 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); |
| 1816 | |
| 1817 | /* For every jump slot reserved in the sgotplt, reloc_count is |
| 1818 | incremented. However, when we reserve space for TLS descriptors, |
| 1819 | it's not incremented, so in order to compute the space reserved |
| 1820 | for them, it suffices to multiply the reloc count by the jump |
| 1821 | slot size. */ |
| 1822 | if (htab->srelplt) |
| 1823 | htab->sgotplt_jump_table_size |
| 1824 | = elf64_x86_64_compute_jump_table_size (htab); |
| 1825 | |
| 1826 | if (htab->tlsdesc_plt) |
| 1827 | { |
| 1828 | /* If we're not using lazy TLS relocations, don't generate the |
| 1829 | PLT and GOT entries they require. */ |
| 1830 | if ((info->flags & DF_BIND_NOW)) |
| 1831 | htab->tlsdesc_plt = 0; |
| 1832 | else |
| 1833 | { |
| 1834 | htab->tlsdesc_got = htab->sgot->size; |
| 1835 | htab->sgot->size += GOT_ENTRY_SIZE; |
| 1836 | /* Reserve room for the initial entry. |
| 1837 | FIXME: we could probably do away with it in this case. */ |
| 1838 | if (htab->splt->size == 0) |
| 1839 | htab->splt->size += PLT_ENTRY_SIZE; |
| 1840 | htab->tlsdesc_plt = htab->splt->size; |
| 1841 | htab->splt->size += PLT_ENTRY_SIZE; |
| 1842 | } |
| 1843 | } |
| 1844 | |
| 1845 | /* We now have determined the sizes of the various dynamic sections. |
| 1846 | Allocate memory for them. */ |
| 1847 | relocs = FALSE; |
| 1848 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 1849 | { |
| 1850 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 1851 | continue; |
| 1852 | |
| 1853 | if (s == htab->splt |
| 1854 | || s == htab->sgot |
| 1855 | || s == htab->sgotplt |
| 1856 | || s == htab->sdynbss) |
| 1857 | { |
| 1858 | /* Strip this section if we don't need it; see the |
| 1859 | comment below. */ |
| 1860 | } |
| 1861 | else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) |
| 1862 | { |
| 1863 | if (s->size != 0 && s != htab->srelplt) |
| 1864 | relocs = TRUE; |
| 1865 | |
| 1866 | /* We use the reloc_count field as a counter if we need |
| 1867 | to copy relocs into the output file. */ |
| 1868 | if (s != htab->srelplt) |
| 1869 | s->reloc_count = 0; |
| 1870 | } |
| 1871 | else |
| 1872 | { |
| 1873 | /* It's not one of our sections, so don't allocate space. */ |
| 1874 | continue; |
| 1875 | } |
| 1876 | |
| 1877 | if (s->size == 0) |
| 1878 | { |
| 1879 | /* If we don't need this section, strip it from the |
| 1880 | output file. This is mostly to handle .rela.bss and |
| 1881 | .rela.plt. We must create both sections in |
| 1882 | create_dynamic_sections, because they must be created |
| 1883 | before the linker maps input sections to output |
| 1884 | sections. The linker does that before |
| 1885 | adjust_dynamic_symbol is called, and it is that |
| 1886 | function which decides whether anything needs to go |
| 1887 | into these sections. */ |
| 1888 | |
| 1889 | s->flags |= SEC_EXCLUDE; |
| 1890 | continue; |
| 1891 | } |
| 1892 | |
| 1893 | if ((s->flags & SEC_HAS_CONTENTS) == 0) |
| 1894 | continue; |
| 1895 | |
| 1896 | /* Allocate memory for the section contents. We use bfd_zalloc |
| 1897 | here in case unused entries are not reclaimed before the |
| 1898 | section's contents are written out. This should not happen, |
| 1899 | but this way if it does, we get a R_X86_64_NONE reloc instead |
| 1900 | of garbage. */ |
| 1901 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); |
| 1902 | if (s->contents == NULL) |
| 1903 | return FALSE; |
| 1904 | } |
| 1905 | |
| 1906 | if (htab->elf.dynamic_sections_created) |
| 1907 | { |
| 1908 | /* Add some entries to the .dynamic section. We fill in the |
| 1909 | values later, in elf64_x86_64_finish_dynamic_sections, but we |
| 1910 | must add the entries now so that we get the correct size for |
| 1911 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 1912 | dynamic linker and used by the debugger. */ |
| 1913 | #define add_dynamic_entry(TAG, VAL) \ |
| 1914 | _bfd_elf_add_dynamic_entry (info, TAG, VAL) |
| 1915 | |
| 1916 | if (info->executable) |
| 1917 | { |
| 1918 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 1919 | return FALSE; |
| 1920 | } |
| 1921 | |
| 1922 | if (htab->splt->size != 0) |
| 1923 | { |
| 1924 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 1925 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 1926 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) |
| 1927 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 1928 | return FALSE; |
| 1929 | |
| 1930 | if (htab->tlsdesc_plt |
| 1931 | && (!add_dynamic_entry (DT_TLSDESC_PLT, 0) |
| 1932 | || !add_dynamic_entry (DT_TLSDESC_GOT, 0))) |
| 1933 | return FALSE; |
| 1934 | } |
| 1935 | |
| 1936 | if (relocs) |
| 1937 | { |
| 1938 | if (!add_dynamic_entry (DT_RELA, 0) |
| 1939 | || !add_dynamic_entry (DT_RELASZ, 0) |
| 1940 | || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) |
| 1941 | return FALSE; |
| 1942 | |
| 1943 | /* If any dynamic relocs apply to a read-only section, |
| 1944 | then we need a DT_TEXTREL entry. */ |
| 1945 | if ((info->flags & DF_TEXTREL) == 0) |
| 1946 | elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, |
| 1947 | (PTR) info); |
| 1948 | |
| 1949 | if ((info->flags & DF_TEXTREL) != 0) |
| 1950 | { |
| 1951 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 1952 | return FALSE; |
| 1953 | } |
| 1954 | } |
| 1955 | } |
| 1956 | #undef add_dynamic_entry |
| 1957 | |
| 1958 | return TRUE; |
| 1959 | } |
| 1960 | |
| 1961 | static bfd_boolean |
| 1962 | elf64_x86_64_always_size_sections (bfd *output_bfd, |
| 1963 | struct bfd_link_info *info) |
| 1964 | { |
| 1965 | asection *tls_sec = elf_hash_table (info)->tls_sec; |
| 1966 | |
| 1967 | if (tls_sec) |
| 1968 | { |
| 1969 | struct elf_link_hash_entry *tlsbase; |
| 1970 | |
| 1971 | tlsbase = elf_link_hash_lookup (elf_hash_table (info), |
| 1972 | "_TLS_MODULE_BASE_", |
| 1973 | FALSE, FALSE, FALSE); |
| 1974 | |
| 1975 | if (tlsbase && tlsbase->type == STT_TLS) |
| 1976 | { |
| 1977 | struct bfd_link_hash_entry *bh = NULL; |
| 1978 | const struct elf_backend_data *bed |
| 1979 | = get_elf_backend_data (output_bfd); |
| 1980 | |
| 1981 | if (!(_bfd_generic_link_add_one_symbol |
| 1982 | (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, |
| 1983 | tls_sec, 0, NULL, FALSE, |
| 1984 | bed->collect, &bh))) |
| 1985 | return FALSE; |
| 1986 | tlsbase = (struct elf_link_hash_entry *)bh; |
| 1987 | tlsbase->def_regular = 1; |
| 1988 | tlsbase->other = STV_HIDDEN; |
| 1989 | (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); |
| 1990 | } |
| 1991 | } |
| 1992 | |
| 1993 | return TRUE; |
| 1994 | } |
| 1995 | |
| 1996 | /* Return the base VMA address which should be subtracted from real addresses |
| 1997 | when resolving @dtpoff relocation. |
| 1998 | This is PT_TLS segment p_vaddr. */ |
| 1999 | |
| 2000 | static bfd_vma |
| 2001 | dtpoff_base (struct bfd_link_info *info) |
| 2002 | { |
| 2003 | /* If tls_sec is NULL, we should have signalled an error already. */ |
| 2004 | if (elf_hash_table (info)->tls_sec == NULL) |
| 2005 | return 0; |
| 2006 | return elf_hash_table (info)->tls_sec->vma; |
| 2007 | } |
| 2008 | |
| 2009 | /* Return the relocation value for @tpoff relocation |
| 2010 | if STT_TLS virtual address is ADDRESS. */ |
| 2011 | |
| 2012 | static bfd_vma |
| 2013 | tpoff (struct bfd_link_info *info, bfd_vma address) |
| 2014 | { |
| 2015 | struct elf_link_hash_table *htab = elf_hash_table (info); |
| 2016 | |
| 2017 | /* If tls_segment is NULL, we should have signalled an error already. */ |
| 2018 | if (htab->tls_sec == NULL) |
| 2019 | return 0; |
| 2020 | return address - htab->tls_size - htab->tls_sec->vma; |
| 2021 | } |
| 2022 | |
| 2023 | /* Is the instruction before OFFSET in CONTENTS a 32bit relative |
| 2024 | branch? */ |
| 2025 | |
| 2026 | static bfd_boolean |
| 2027 | is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset) |
| 2028 | { |
| 2029 | /* Opcode Instruction |
| 2030 | 0xe8 call |
| 2031 | 0xe9 jump |
| 2032 | 0x0f 0x8x conditional jump */ |
| 2033 | return ((offset > 0 |
| 2034 | && (contents [offset - 1] == 0xe8 |
| 2035 | || contents [offset - 1] == 0xe9)) |
| 2036 | || (offset > 1 |
| 2037 | && contents [offset - 2] == 0x0f |
| 2038 | && (contents [offset - 1] & 0xf0) == 0x80)); |
| 2039 | } |
| 2040 | |
| 2041 | /* Relocate an x86_64 ELF section. */ |
| 2042 | |
| 2043 | static bfd_boolean |
| 2044 | elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info, |
| 2045 | bfd *input_bfd, asection *input_section, |
| 2046 | bfd_byte *contents, Elf_Internal_Rela *relocs, |
| 2047 | Elf_Internal_Sym *local_syms, |
| 2048 | asection **local_sections) |
| 2049 | { |
| 2050 | struct elf64_x86_64_link_hash_table *htab; |
| 2051 | Elf_Internal_Shdr *symtab_hdr; |
| 2052 | struct elf_link_hash_entry **sym_hashes; |
| 2053 | bfd_vma *local_got_offsets; |
| 2054 | bfd_vma *local_tlsdesc_gotents; |
| 2055 | Elf_Internal_Rela *rel; |
| 2056 | Elf_Internal_Rela *relend; |
| 2057 | |
| 2058 | htab = elf64_x86_64_hash_table (info); |
| 2059 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 2060 | sym_hashes = elf_sym_hashes (input_bfd); |
| 2061 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 2062 | local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd); |
| 2063 | |
| 2064 | rel = relocs; |
| 2065 | relend = relocs + input_section->reloc_count; |
| 2066 | for (; rel < relend; rel++) |
| 2067 | { |
| 2068 | unsigned int r_type; |
| 2069 | reloc_howto_type *howto; |
| 2070 | unsigned long r_symndx; |
| 2071 | struct elf_link_hash_entry *h; |
| 2072 | Elf_Internal_Sym *sym; |
| 2073 | asection *sec; |
| 2074 | bfd_vma off, offplt; |
| 2075 | bfd_vma relocation; |
| 2076 | bfd_boolean unresolved_reloc; |
| 2077 | bfd_reloc_status_type r; |
| 2078 | int tls_type; |
| 2079 | |
| 2080 | r_type = ELF64_R_TYPE (rel->r_info); |
| 2081 | if (r_type == (int) R_X86_64_GNU_VTINHERIT |
| 2082 | || r_type == (int) R_X86_64_GNU_VTENTRY) |
| 2083 | continue; |
| 2084 | |
| 2085 | if (r_type >= R_X86_64_max) |
| 2086 | { |
| 2087 | bfd_set_error (bfd_error_bad_value); |
| 2088 | return FALSE; |
| 2089 | } |
| 2090 | |
| 2091 | howto = x86_64_elf_howto_table + r_type; |
| 2092 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 2093 | h = NULL; |
| 2094 | sym = NULL; |
| 2095 | sec = NULL; |
| 2096 | unresolved_reloc = FALSE; |
| 2097 | if (r_symndx < symtab_hdr->sh_info) |
| 2098 | { |
| 2099 | sym = local_syms + r_symndx; |
| 2100 | sec = local_sections[r_symndx]; |
| 2101 | |
| 2102 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); |
| 2103 | } |
| 2104 | else |
| 2105 | { |
| 2106 | bfd_boolean warned; |
| 2107 | |
| 2108 | RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| 2109 | r_symndx, symtab_hdr, sym_hashes, |
| 2110 | h, sec, relocation, |
| 2111 | unresolved_reloc, warned); |
| 2112 | } |
| 2113 | |
| 2114 | if (sec != NULL && elf_discarded_section (sec)) |
| 2115 | { |
| 2116 | /* For relocs against symbols from removed linkonce sections, |
| 2117 | or sections discarded by a linker script, we just want the |
| 2118 | section contents zeroed. Avoid any special processing. */ |
| 2119 | _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); |
| 2120 | rel->r_info = 0; |
| 2121 | rel->r_addend = 0; |
| 2122 | continue; |
| 2123 | } |
| 2124 | |
| 2125 | if (info->relocatable) |
| 2126 | continue; |
| 2127 | |
| 2128 | /* When generating a shared object, the relocations handled here are |
| 2129 | copied into the output file to be resolved at run time. */ |
| 2130 | switch (r_type) |
| 2131 | { |
| 2132 | asection *base_got; |
| 2133 | case R_X86_64_GOT32: |
| 2134 | case R_X86_64_GOT64: |
| 2135 | /* Relocation is to the entry for this symbol in the global |
| 2136 | offset table. */ |
| 2137 | case R_X86_64_GOTPCREL: |
| 2138 | case R_X86_64_GOTPCREL64: |
| 2139 | /* Use global offset table entry as symbol value. */ |
| 2140 | case R_X86_64_GOTPLT64: |
| 2141 | /* This is the same as GOT64 for relocation purposes, but |
| 2142 | indicates the existence of a PLT entry. The difficulty is, |
| 2143 | that we must calculate the GOT slot offset from the PLT |
| 2144 | offset, if this symbol got a PLT entry (it was global). |
| 2145 | Additionally if it's computed from the PLT entry, then that |
| 2146 | GOT offset is relative to .got.plt, not to .got. */ |
| 2147 | base_got = htab->sgot; |
| 2148 | |
| 2149 | if (htab->sgot == NULL) |
| 2150 | abort (); |
| 2151 | |
| 2152 | if (h != NULL) |
| 2153 | { |
| 2154 | bfd_boolean dyn; |
| 2155 | |
| 2156 | off = h->got.offset; |
| 2157 | if (h->needs_plt |
| 2158 | && h->plt.offset != (bfd_vma)-1 |
| 2159 | && off == (bfd_vma)-1) |
| 2160 | { |
| 2161 | /* We can't use h->got.offset here to save |
| 2162 | state, or even just remember the offset, as |
| 2163 | finish_dynamic_symbol would use that as offset into |
| 2164 | .got. */ |
| 2165 | bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 2166 | off = (plt_index + 3) * GOT_ENTRY_SIZE; |
| 2167 | base_got = htab->sgotplt; |
| 2168 | } |
| 2169 | |
| 2170 | dyn = htab->elf.dynamic_sections_created; |
| 2171 | |
| 2172 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| 2173 | || (info->shared |
| 2174 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 2175 | || (ELF_ST_VISIBILITY (h->other) |
| 2176 | && h->root.type == bfd_link_hash_undefweak)) |
| 2177 | { |
| 2178 | /* This is actually a static link, or it is a -Bsymbolic |
| 2179 | link and the symbol is defined locally, or the symbol |
| 2180 | was forced to be local because of a version file. We |
| 2181 | must initialize this entry in the global offset table. |
| 2182 | Since the offset must always be a multiple of 8, we |
| 2183 | use the least significant bit to record whether we |
| 2184 | have initialized it already. |
| 2185 | |
| 2186 | When doing a dynamic link, we create a .rela.got |
| 2187 | relocation entry to initialize the value. This is |
| 2188 | done in the finish_dynamic_symbol routine. */ |
| 2189 | if ((off & 1) != 0) |
| 2190 | off &= ~1; |
| 2191 | else |
| 2192 | { |
| 2193 | bfd_put_64 (output_bfd, relocation, |
| 2194 | base_got->contents + off); |
| 2195 | /* Note that this is harmless for the GOTPLT64 case, |
| 2196 | as -1 | 1 still is -1. */ |
| 2197 | h->got.offset |= 1; |
| 2198 | } |
| 2199 | } |
| 2200 | else |
| 2201 | unresolved_reloc = FALSE; |
| 2202 | } |
| 2203 | else |
| 2204 | { |
| 2205 | if (local_got_offsets == NULL) |
| 2206 | abort (); |
| 2207 | |
| 2208 | off = local_got_offsets[r_symndx]; |
| 2209 | |
| 2210 | /* The offset must always be a multiple of 8. We use |
| 2211 | the least significant bit to record whether we have |
| 2212 | already generated the necessary reloc. */ |
| 2213 | if ((off & 1) != 0) |
| 2214 | off &= ~1; |
| 2215 | else |
| 2216 | { |
| 2217 | bfd_put_64 (output_bfd, relocation, |
| 2218 | base_got->contents + off); |
| 2219 | |
| 2220 | if (info->shared) |
| 2221 | { |
| 2222 | asection *s; |
| 2223 | Elf_Internal_Rela outrel; |
| 2224 | bfd_byte *loc; |
| 2225 | |
| 2226 | /* We need to generate a R_X86_64_RELATIVE reloc |
| 2227 | for the dynamic linker. */ |
| 2228 | s = htab->srelgot; |
| 2229 | if (s == NULL) |
| 2230 | abort (); |
| 2231 | |
| 2232 | outrel.r_offset = (base_got->output_section->vma |
| 2233 | + base_got->output_offset |
| 2234 | + off); |
| 2235 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); |
| 2236 | outrel.r_addend = relocation; |
| 2237 | loc = s->contents; |
| 2238 | loc += s->reloc_count++ * sizeof (Elf64_External_Rela); |
| 2239 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 2240 | } |
| 2241 | |
| 2242 | local_got_offsets[r_symndx] |= 1; |
| 2243 | } |
| 2244 | } |
| 2245 | |
| 2246 | if (off >= (bfd_vma) -2) |
| 2247 | abort (); |
| 2248 | |
| 2249 | relocation = base_got->output_section->vma |
| 2250 | + base_got->output_offset + off; |
| 2251 | if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64) |
| 2252 | relocation -= htab->sgotplt->output_section->vma |
| 2253 | - htab->sgotplt->output_offset; |
| 2254 | |
| 2255 | break; |
| 2256 | |
| 2257 | case R_X86_64_GOTOFF64: |
| 2258 | /* Relocation is relative to the start of the global offset |
| 2259 | table. */ |
| 2260 | |
| 2261 | /* Check to make sure it isn't a protected function symbol |
| 2262 | for shared library since it may not be local when used |
| 2263 | as function address. */ |
| 2264 | if (info->shared |
| 2265 | && h |
| 2266 | && h->def_regular |
| 2267 | && h->type == STT_FUNC |
| 2268 | && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 2269 | { |
| 2270 | (*_bfd_error_handler) |
| 2271 | (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"), |
| 2272 | input_bfd, h->root.root.string); |
| 2273 | bfd_set_error (bfd_error_bad_value); |
| 2274 | return FALSE; |
| 2275 | } |
| 2276 | |
| 2277 | /* Note that sgot is not involved in this |
| 2278 | calculation. We always want the start of .got.plt. If we |
| 2279 | defined _GLOBAL_OFFSET_TABLE_ in a different way, as is |
| 2280 | permitted by the ABI, we might have to change this |
| 2281 | calculation. */ |
| 2282 | relocation -= htab->sgotplt->output_section->vma |
| 2283 | + htab->sgotplt->output_offset; |
| 2284 | break; |
| 2285 | |
| 2286 | case R_X86_64_GOTPC32: |
| 2287 | case R_X86_64_GOTPC64: |
| 2288 | /* Use global offset table as symbol value. */ |
| 2289 | relocation = htab->sgotplt->output_section->vma |
| 2290 | + htab->sgotplt->output_offset; |
| 2291 | unresolved_reloc = FALSE; |
| 2292 | break; |
| 2293 | |
| 2294 | case R_X86_64_PLTOFF64: |
| 2295 | /* Relocation is PLT entry relative to GOT. For local |
| 2296 | symbols it's the symbol itself relative to GOT. */ |
| 2297 | if (h != NULL |
| 2298 | /* See PLT32 handling. */ |
| 2299 | && h->plt.offset != (bfd_vma) -1 |
| 2300 | && htab->splt != NULL) |
| 2301 | { |
| 2302 | relocation = (htab->splt->output_section->vma |
| 2303 | + htab->splt->output_offset |
| 2304 | + h->plt.offset); |
| 2305 | unresolved_reloc = FALSE; |
| 2306 | } |
| 2307 | |
| 2308 | relocation -= htab->sgotplt->output_section->vma |
| 2309 | + htab->sgotplt->output_offset; |
| 2310 | break; |
| 2311 | |
| 2312 | case R_X86_64_PLT32: |
| 2313 | /* Relocation is to the entry for this symbol in the |
| 2314 | procedure linkage table. */ |
| 2315 | |
| 2316 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 2317 | without using the procedure linkage table. */ |
| 2318 | if (h == NULL) |
| 2319 | break; |
| 2320 | |
| 2321 | if (h->plt.offset == (bfd_vma) -1 |
| 2322 | || htab->splt == NULL) |
| 2323 | { |
| 2324 | /* We didn't make a PLT entry for this symbol. This |
| 2325 | happens when statically linking PIC code, or when |
| 2326 | using -Bsymbolic. */ |
| 2327 | break; |
| 2328 | } |
| 2329 | |
| 2330 | relocation = (htab->splt->output_section->vma |
| 2331 | + htab->splt->output_offset |
| 2332 | + h->plt.offset); |
| 2333 | unresolved_reloc = FALSE; |
| 2334 | break; |
| 2335 | |
| 2336 | case R_X86_64_PC8: |
| 2337 | case R_X86_64_PC16: |
| 2338 | case R_X86_64_PC32: |
| 2339 | if (info->shared |
| 2340 | && !SYMBOL_REFERENCES_LOCAL (info, h) |
| 2341 | && (input_section->flags & SEC_ALLOC) != 0 |
| 2342 | && (input_section->flags & SEC_READONLY) != 0 |
| 2343 | && (!h->def_regular |
| 2344 | || r_type != R_X86_64_PC32 |
| 2345 | || h->type != STT_FUNC |
| 2346 | || ELF_ST_VISIBILITY (h->other) != STV_PROTECTED |
| 2347 | || !is_32bit_relative_branch (contents, |
| 2348 | rel->r_offset))) |
| 2349 | { |
| 2350 | if (h->def_regular |
| 2351 | && r_type == R_X86_64_PC32 |
| 2352 | && h->type == STT_FUNC |
| 2353 | && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) |
| 2354 | (*_bfd_error_handler) |
| 2355 | (_("%B: relocation R_X86_64_PC32 against protected function `%s' can not be used when making a shared object"), |
| 2356 | input_bfd, h->root.root.string); |
| 2357 | else |
| 2358 | (*_bfd_error_handler) |
| 2359 | (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"), |
| 2360 | input_bfd, x86_64_elf_howto_table[r_type].name, |
| 2361 | h->root.root.string); |
| 2362 | bfd_set_error (bfd_error_bad_value); |
| 2363 | return FALSE; |
| 2364 | } |
| 2365 | /* Fall through. */ |
| 2366 | |
| 2367 | case R_X86_64_8: |
| 2368 | case R_X86_64_16: |
| 2369 | case R_X86_64_32: |
| 2370 | case R_X86_64_PC64: |
| 2371 | case R_X86_64_64: |
| 2372 | /* FIXME: The ABI says the linker should make sure the value is |
| 2373 | the same when it's zeroextended to 64 bit. */ |
| 2374 | |
| 2375 | if ((input_section->flags & SEC_ALLOC) == 0) |
| 2376 | break; |
| 2377 | |
| 2378 | if ((info->shared |
| 2379 | && (h == NULL |
| 2380 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 2381 | || h->root.type != bfd_link_hash_undefweak) |
| 2382 | && ((r_type != R_X86_64_PC8 |
| 2383 | && r_type != R_X86_64_PC16 |
| 2384 | && r_type != R_X86_64_PC32 |
| 2385 | && r_type != R_X86_64_PC64) |
| 2386 | || !SYMBOL_CALLS_LOCAL (info, h))) |
| 2387 | || (ELIMINATE_COPY_RELOCS |
| 2388 | && !info->shared |
| 2389 | && h != NULL |
| 2390 | && h->dynindx != -1 |
| 2391 | && !h->non_got_ref |
| 2392 | && ((h->def_dynamic |
| 2393 | && !h->def_regular) |
| 2394 | || h->root.type == bfd_link_hash_undefweak |
| 2395 | || h->root.type == bfd_link_hash_undefined))) |
| 2396 | { |
| 2397 | Elf_Internal_Rela outrel; |
| 2398 | bfd_byte *loc; |
| 2399 | bfd_boolean skip, relocate; |
| 2400 | asection *sreloc; |
| 2401 | |
| 2402 | /* When generating a shared object, these relocations |
| 2403 | are copied into the output file to be resolved at run |
| 2404 | time. */ |
| 2405 | skip = FALSE; |
| 2406 | relocate = FALSE; |
| 2407 | |
| 2408 | outrel.r_offset = |
| 2409 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 2410 | rel->r_offset); |
| 2411 | if (outrel.r_offset == (bfd_vma) -1) |
| 2412 | skip = TRUE; |
| 2413 | else if (outrel.r_offset == (bfd_vma) -2) |
| 2414 | skip = TRUE, relocate = TRUE; |
| 2415 | |
| 2416 | outrel.r_offset += (input_section->output_section->vma |
| 2417 | + input_section->output_offset); |
| 2418 | |
| 2419 | if (skip) |
| 2420 | memset (&outrel, 0, sizeof outrel); |
| 2421 | |
| 2422 | /* h->dynindx may be -1 if this symbol was marked to |
| 2423 | become local. */ |
| 2424 | else if (h != NULL |
| 2425 | && h->dynindx != -1 |
| 2426 | && (r_type == R_X86_64_PC8 |
| 2427 | || r_type == R_X86_64_PC16 |
| 2428 | || r_type == R_X86_64_PC32 |
| 2429 | || r_type == R_X86_64_PC64 |
| 2430 | || !info->shared |
| 2431 | || !SYMBOLIC_BIND (info, h) |
| 2432 | || !h->def_regular)) |
| 2433 | { |
| 2434 | outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); |
| 2435 | outrel.r_addend = rel->r_addend; |
| 2436 | } |
| 2437 | else |
| 2438 | { |
| 2439 | /* This symbol is local, or marked to become local. */ |
| 2440 | if (r_type == R_X86_64_64) |
| 2441 | { |
| 2442 | relocate = TRUE; |
| 2443 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); |
| 2444 | outrel.r_addend = relocation + rel->r_addend; |
| 2445 | } |
| 2446 | else |
| 2447 | { |
| 2448 | long sindx; |
| 2449 | |
| 2450 | if (bfd_is_abs_section (sec)) |
| 2451 | sindx = 0; |
| 2452 | else if (sec == NULL || sec->owner == NULL) |
| 2453 | { |
| 2454 | bfd_set_error (bfd_error_bad_value); |
| 2455 | return FALSE; |
| 2456 | } |
| 2457 | else |
| 2458 | { |
| 2459 | asection *osec; |
| 2460 | |
| 2461 | /* We are turning this relocation into one |
| 2462 | against a section symbol. It would be |
| 2463 | proper to subtract the symbol's value, |
| 2464 | osec->vma, from the emitted reloc addend, |
| 2465 | but ld.so expects buggy relocs. */ |
| 2466 | osec = sec->output_section; |
| 2467 | sindx = elf_section_data (osec)->dynindx; |
| 2468 | if (sindx == 0) |
| 2469 | { |
| 2470 | asection *oi = htab->elf.text_index_section; |
| 2471 | sindx = elf_section_data (oi)->dynindx; |
| 2472 | } |
| 2473 | BFD_ASSERT (sindx != 0); |
| 2474 | } |
| 2475 | |
| 2476 | outrel.r_info = ELF64_R_INFO (sindx, r_type); |
| 2477 | outrel.r_addend = relocation + rel->r_addend; |
| 2478 | } |
| 2479 | } |
| 2480 | |
| 2481 | sreloc = elf_section_data (input_section)->sreloc; |
| 2482 | if (sreloc == NULL) |
| 2483 | abort (); |
| 2484 | |
| 2485 | loc = sreloc->contents; |
| 2486 | loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); |
| 2487 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 2488 | |
| 2489 | /* If this reloc is against an external symbol, we do |
| 2490 | not want to fiddle with the addend. Otherwise, we |
| 2491 | need to include the symbol value so that it becomes |
| 2492 | an addend for the dynamic reloc. */ |
| 2493 | if (! relocate) |
| 2494 | continue; |
| 2495 | } |
| 2496 | |
| 2497 | break; |
| 2498 | |
| 2499 | case R_X86_64_TLSGD: |
| 2500 | case R_X86_64_GOTPC32_TLSDESC: |
| 2501 | case R_X86_64_TLSDESC_CALL: |
| 2502 | case R_X86_64_GOTTPOFF: |
| 2503 | r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL); |
| 2504 | tls_type = GOT_UNKNOWN; |
| 2505 | if (h == NULL && local_got_offsets) |
| 2506 | tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx]; |
| 2507 | else if (h != NULL) |
| 2508 | { |
| 2509 | tls_type = elf64_x86_64_hash_entry (h)->tls_type; |
| 2510 | if (!info->shared && h->dynindx == -1 && tls_type == GOT_TLS_IE) |
| 2511 | r_type = R_X86_64_TPOFF32; |
| 2512 | } |
| 2513 | if (r_type == R_X86_64_TLSGD |
| 2514 | || r_type == R_X86_64_GOTPC32_TLSDESC |
| 2515 | || r_type == R_X86_64_TLSDESC_CALL) |
| 2516 | { |
| 2517 | if (tls_type == GOT_TLS_IE) |
| 2518 | r_type = R_X86_64_GOTTPOFF; |
| 2519 | } |
| 2520 | |
| 2521 | if (r_type == R_X86_64_TPOFF32) |
| 2522 | { |
| 2523 | BFD_ASSERT (! unresolved_reloc); |
| 2524 | if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD) |
| 2525 | { |
| 2526 | unsigned int i; |
| 2527 | static unsigned char tlsgd[8] |
| 2528 | = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 }; |
| 2529 | |
| 2530 | /* GD->LE transition. |
| 2531 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 2532 | .word 0x6666; rex64; call __tls_get_addr@plt |
| 2533 | Change it into: |
| 2534 | movq %fs:0, %rax |
| 2535 | leaq foo@tpoff(%rax), %rax */ |
| 2536 | BFD_ASSERT (rel->r_offset >= 4); |
| 2537 | for (i = 0; i < 4; i++) |
| 2538 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2539 | contents + rel->r_offset - 4 + i) |
| 2540 | == tlsgd[i]); |
| 2541 | BFD_ASSERT (rel->r_offset + 12 <= input_section->size); |
| 2542 | for (i = 0; i < 4; i++) |
| 2543 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2544 | contents + rel->r_offset + 4 + i) |
| 2545 | == tlsgd[i+4]); |
| 2546 | BFD_ASSERT (rel + 1 < relend); |
| 2547 | BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); |
| 2548 | memcpy (contents + rel->r_offset - 4, |
| 2549 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", |
| 2550 | 16); |
| 2551 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2552 | contents + rel->r_offset + 8); |
| 2553 | /* Skip R_X86_64_PLT32. */ |
| 2554 | rel++; |
| 2555 | continue; |
| 2556 | } |
| 2557 | else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) |
| 2558 | { |
| 2559 | /* GDesc -> LE transition. |
| 2560 | It's originally something like: |
| 2561 | leaq x@tlsdesc(%rip), %rax |
| 2562 | |
| 2563 | Change it to: |
| 2564 | movl $x@tpoff, %rax |
| 2565 | |
| 2566 | Registers other than %rax may be set up here. */ |
| 2567 | |
| 2568 | unsigned int val, type, type2; |
| 2569 | bfd_vma roff; |
| 2570 | |
| 2571 | /* First, make sure it's a leaq adding rip to a |
| 2572 | 32-bit offset into any register, although it's |
| 2573 | probably almost always going to be rax. */ |
| 2574 | roff = rel->r_offset; |
| 2575 | BFD_ASSERT (roff >= 3); |
| 2576 | type = bfd_get_8 (input_bfd, contents + roff - 3); |
| 2577 | BFD_ASSERT ((type & 0xfb) == 0x48); |
| 2578 | type2 = bfd_get_8 (input_bfd, contents + roff - 2); |
| 2579 | BFD_ASSERT (type2 == 0x8d); |
| 2580 | val = bfd_get_8 (input_bfd, contents + roff - 1); |
| 2581 | BFD_ASSERT ((val & 0xc7) == 0x05); |
| 2582 | BFD_ASSERT (roff + 4 <= input_section->size); |
| 2583 | |
| 2584 | /* Now modify the instruction as appropriate. */ |
| 2585 | bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1), |
| 2586 | contents + roff - 3); |
| 2587 | bfd_put_8 (output_bfd, 0xc7, contents + roff - 2); |
| 2588 | bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7), |
| 2589 | contents + roff - 1); |
| 2590 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2591 | contents + roff); |
| 2592 | continue; |
| 2593 | } |
| 2594 | else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) |
| 2595 | { |
| 2596 | /* GDesc -> LE transition. |
| 2597 | It's originally: |
| 2598 | call *(%rax) |
| 2599 | Turn it into: |
| 2600 | nop; nop. */ |
| 2601 | |
| 2602 | unsigned int val, type; |
| 2603 | bfd_vma roff; |
| 2604 | |
| 2605 | /* First, make sure it's a call *(%rax). */ |
| 2606 | roff = rel->r_offset; |
| 2607 | BFD_ASSERT (roff + 2 <= input_section->size); |
| 2608 | type = bfd_get_8 (input_bfd, contents + roff); |
| 2609 | BFD_ASSERT (type == 0xff); |
| 2610 | val = bfd_get_8 (input_bfd, contents + roff + 1); |
| 2611 | BFD_ASSERT (val == 0x10); |
| 2612 | |
| 2613 | /* Now modify the instruction as appropriate. Use |
| 2614 | xchg %ax,%ax instead of 2 nops. */ |
| 2615 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 2616 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 2617 | continue; |
| 2618 | } |
| 2619 | else |
| 2620 | { |
| 2621 | unsigned int val, type, reg; |
| 2622 | |
| 2623 | /* IE->LE transition: |
| 2624 | Originally it can be one of: |
| 2625 | movq foo@gottpoff(%rip), %reg |
| 2626 | addq foo@gottpoff(%rip), %reg |
| 2627 | We change it into: |
| 2628 | movq $foo, %reg |
| 2629 | leaq foo(%reg), %reg |
| 2630 | addq $foo, %reg. */ |
| 2631 | BFD_ASSERT (rel->r_offset >= 3); |
| 2632 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 3); |
| 2633 | BFD_ASSERT (val == 0x48 || val == 0x4c); |
| 2634 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2635 | BFD_ASSERT (type == 0x8b || type == 0x03); |
| 2636 | reg = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2637 | BFD_ASSERT ((reg & 0xc7) == 5); |
| 2638 | reg >>= 3; |
| 2639 | BFD_ASSERT (rel->r_offset + 4 <= input_section->size); |
| 2640 | if (type == 0x8b) |
| 2641 | { |
| 2642 | /* movq */ |
| 2643 | if (val == 0x4c) |
| 2644 | bfd_put_8 (output_bfd, 0x49, |
| 2645 | contents + rel->r_offset - 3); |
| 2646 | bfd_put_8 (output_bfd, 0xc7, |
| 2647 | contents + rel->r_offset - 2); |
| 2648 | bfd_put_8 (output_bfd, 0xc0 | reg, |
| 2649 | contents + rel->r_offset - 1); |
| 2650 | } |
| 2651 | else if (reg == 4) |
| 2652 | { |
| 2653 | /* addq -> addq - addressing with %rsp/%r12 is |
| 2654 | special */ |
| 2655 | if (val == 0x4c) |
| 2656 | bfd_put_8 (output_bfd, 0x49, |
| 2657 | contents + rel->r_offset - 3); |
| 2658 | bfd_put_8 (output_bfd, 0x81, |
| 2659 | contents + rel->r_offset - 2); |
| 2660 | bfd_put_8 (output_bfd, 0xc0 | reg, |
| 2661 | contents + rel->r_offset - 1); |
| 2662 | } |
| 2663 | else |
| 2664 | { |
| 2665 | /* addq -> leaq */ |
| 2666 | if (val == 0x4c) |
| 2667 | bfd_put_8 (output_bfd, 0x4d, |
| 2668 | contents + rel->r_offset - 3); |
| 2669 | bfd_put_8 (output_bfd, 0x8d, |
| 2670 | contents + rel->r_offset - 2); |
| 2671 | bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), |
| 2672 | contents + rel->r_offset - 1); |
| 2673 | } |
| 2674 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2675 | contents + rel->r_offset); |
| 2676 | continue; |
| 2677 | } |
| 2678 | } |
| 2679 | |
| 2680 | if (htab->sgot == NULL) |
| 2681 | abort (); |
| 2682 | |
| 2683 | if (h != NULL) |
| 2684 | { |
| 2685 | off = h->got.offset; |
| 2686 | offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got; |
| 2687 | } |
| 2688 | else |
| 2689 | { |
| 2690 | if (local_got_offsets == NULL) |
| 2691 | abort (); |
| 2692 | |
| 2693 | off = local_got_offsets[r_symndx]; |
| 2694 | offplt = local_tlsdesc_gotents[r_symndx]; |
| 2695 | } |
| 2696 | |
| 2697 | if ((off & 1) != 0) |
| 2698 | off &= ~1; |
| 2699 | else |
| 2700 | { |
| 2701 | Elf_Internal_Rela outrel; |
| 2702 | bfd_byte *loc; |
| 2703 | int dr_type, indx; |
| 2704 | asection *sreloc; |
| 2705 | |
| 2706 | if (htab->srelgot == NULL) |
| 2707 | abort (); |
| 2708 | |
| 2709 | indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| 2710 | |
| 2711 | if (GOT_TLS_GDESC_P (tls_type)) |
| 2712 | { |
| 2713 | outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC); |
| 2714 | BFD_ASSERT (htab->sgotplt_jump_table_size + offplt |
| 2715 | + 2 * GOT_ENTRY_SIZE <= htab->sgotplt->size); |
| 2716 | outrel.r_offset = (htab->sgotplt->output_section->vma |
| 2717 | + htab->sgotplt->output_offset |
| 2718 | + offplt |
| 2719 | + htab->sgotplt_jump_table_size); |
| 2720 | sreloc = htab->srelplt; |
| 2721 | loc = sreloc->contents; |
| 2722 | loc += sreloc->reloc_count++ |
| 2723 | * sizeof (Elf64_External_Rela); |
| 2724 | BFD_ASSERT (loc + sizeof (Elf64_External_Rela) |
| 2725 | <= sreloc->contents + sreloc->size); |
| 2726 | if (indx == 0) |
| 2727 | outrel.r_addend = relocation - dtpoff_base (info); |
| 2728 | else |
| 2729 | outrel.r_addend = 0; |
| 2730 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 2731 | } |
| 2732 | |
| 2733 | sreloc = htab->srelgot; |
| 2734 | |
| 2735 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2736 | + htab->sgot->output_offset + off); |
| 2737 | |
| 2738 | if (GOT_TLS_GD_P (tls_type)) |
| 2739 | dr_type = R_X86_64_DTPMOD64; |
| 2740 | else if (GOT_TLS_GDESC_P (tls_type)) |
| 2741 | goto dr_done; |
| 2742 | else |
| 2743 | dr_type = R_X86_64_TPOFF64; |
| 2744 | |
| 2745 | bfd_put_64 (output_bfd, 0, htab->sgot->contents + off); |
| 2746 | outrel.r_addend = 0; |
| 2747 | if ((dr_type == R_X86_64_TPOFF64 |
| 2748 | || dr_type == R_X86_64_TLSDESC) && indx == 0) |
| 2749 | outrel.r_addend = relocation - dtpoff_base (info); |
| 2750 | outrel.r_info = ELF64_R_INFO (indx, dr_type); |
| 2751 | |
| 2752 | loc = sreloc->contents; |
| 2753 | loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); |
| 2754 | BFD_ASSERT (loc + sizeof (Elf64_External_Rela) |
| 2755 | <= sreloc->contents + sreloc->size); |
| 2756 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 2757 | |
| 2758 | if (GOT_TLS_GD_P (tls_type)) |
| 2759 | { |
| 2760 | if (indx == 0) |
| 2761 | { |
| 2762 | BFD_ASSERT (! unresolved_reloc); |
| 2763 | bfd_put_64 (output_bfd, |
| 2764 | relocation - dtpoff_base (info), |
| 2765 | htab->sgot->contents + off + GOT_ENTRY_SIZE); |
| 2766 | } |
| 2767 | else |
| 2768 | { |
| 2769 | bfd_put_64 (output_bfd, 0, |
| 2770 | htab->sgot->contents + off + GOT_ENTRY_SIZE); |
| 2771 | outrel.r_info = ELF64_R_INFO (indx, |
| 2772 | R_X86_64_DTPOFF64); |
| 2773 | outrel.r_offset += GOT_ENTRY_SIZE; |
| 2774 | sreloc->reloc_count++; |
| 2775 | loc += sizeof (Elf64_External_Rela); |
| 2776 | BFD_ASSERT (loc + sizeof (Elf64_External_Rela) |
| 2777 | <= sreloc->contents + sreloc->size); |
| 2778 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 2779 | } |
| 2780 | } |
| 2781 | |
| 2782 | dr_done: |
| 2783 | if (h != NULL) |
| 2784 | h->got.offset |= 1; |
| 2785 | else |
| 2786 | local_got_offsets[r_symndx] |= 1; |
| 2787 | } |
| 2788 | |
| 2789 | if (off >= (bfd_vma) -2 |
| 2790 | && ! GOT_TLS_GDESC_P (tls_type)) |
| 2791 | abort (); |
| 2792 | if (r_type == ELF64_R_TYPE (rel->r_info)) |
| 2793 | { |
| 2794 | if (r_type == R_X86_64_GOTPC32_TLSDESC |
| 2795 | || r_type == R_X86_64_TLSDESC_CALL) |
| 2796 | relocation = htab->sgotplt->output_section->vma |
| 2797 | + htab->sgotplt->output_offset |
| 2798 | + offplt + htab->sgotplt_jump_table_size; |
| 2799 | else |
| 2800 | relocation = htab->sgot->output_section->vma |
| 2801 | + htab->sgot->output_offset + off; |
| 2802 | unresolved_reloc = FALSE; |
| 2803 | } |
| 2804 | else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD) |
| 2805 | { |
| 2806 | unsigned int i; |
| 2807 | static unsigned char tlsgd[8] |
| 2808 | = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 }; |
| 2809 | |
| 2810 | /* GD->IE transition. |
| 2811 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 2812 | .word 0x6666; rex64; call __tls_get_addr@plt |
| 2813 | Change it into: |
| 2814 | movq %fs:0, %rax |
| 2815 | addq foo@gottpoff(%rip), %rax */ |
| 2816 | BFD_ASSERT (rel->r_offset >= 4); |
| 2817 | for (i = 0; i < 4; i++) |
| 2818 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2819 | contents + rel->r_offset - 4 + i) |
| 2820 | == tlsgd[i]); |
| 2821 | BFD_ASSERT (rel->r_offset + 12 <= input_section->size); |
| 2822 | for (i = 0; i < 4; i++) |
| 2823 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2824 | contents + rel->r_offset + 4 + i) |
| 2825 | == tlsgd[i+4]); |
| 2826 | BFD_ASSERT (rel + 1 < relend); |
| 2827 | BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); |
| 2828 | memcpy (contents + rel->r_offset - 4, |
| 2829 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", |
| 2830 | 16); |
| 2831 | |
| 2832 | relocation = (htab->sgot->output_section->vma |
| 2833 | + htab->sgot->output_offset + off |
| 2834 | - rel->r_offset |
| 2835 | - input_section->output_section->vma |
| 2836 | - input_section->output_offset |
| 2837 | - 12); |
| 2838 | bfd_put_32 (output_bfd, relocation, |
| 2839 | contents + rel->r_offset + 8); |
| 2840 | /* Skip R_X86_64_PLT32. */ |
| 2841 | rel++; |
| 2842 | continue; |
| 2843 | } |
| 2844 | else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC) |
| 2845 | { |
| 2846 | /* GDesc -> IE transition. |
| 2847 | It's originally something like: |
| 2848 | leaq x@tlsdesc(%rip), %rax |
| 2849 | |
| 2850 | Change it to: |
| 2851 | movq x@gottpoff(%rip), %rax # before nop; nop |
| 2852 | |
| 2853 | Registers other than %rax may be set up here. */ |
| 2854 | |
| 2855 | unsigned int val, type, type2; |
| 2856 | bfd_vma roff; |
| 2857 | |
| 2858 | /* First, make sure it's a leaq adding rip to a 32-bit |
| 2859 | offset into any register, although it's probably |
| 2860 | almost always going to be rax. */ |
| 2861 | roff = rel->r_offset; |
| 2862 | BFD_ASSERT (roff >= 3); |
| 2863 | type = bfd_get_8 (input_bfd, contents + roff - 3); |
| 2864 | BFD_ASSERT ((type & 0xfb) == 0x48); |
| 2865 | type2 = bfd_get_8 (input_bfd, contents + roff - 2); |
| 2866 | BFD_ASSERT (type2 == 0x8d); |
| 2867 | val = bfd_get_8 (input_bfd, contents + roff - 1); |
| 2868 | BFD_ASSERT ((val & 0xc7) == 0x05); |
| 2869 | BFD_ASSERT (roff + 4 <= input_section->size); |
| 2870 | |
| 2871 | /* Now modify the instruction as appropriate. */ |
| 2872 | /* To turn a leaq into a movq in the form we use it, it |
| 2873 | suffices to change the second byte from 0x8d to |
| 2874 | 0x8b. */ |
| 2875 | bfd_put_8 (output_bfd, 0x8b, contents + roff - 2); |
| 2876 | |
| 2877 | bfd_put_32 (output_bfd, |
| 2878 | htab->sgot->output_section->vma |
| 2879 | + htab->sgot->output_offset + off |
| 2880 | - rel->r_offset |
| 2881 | - input_section->output_section->vma |
| 2882 | - input_section->output_offset |
| 2883 | - 4, |
| 2884 | contents + roff); |
| 2885 | continue; |
| 2886 | } |
| 2887 | else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL) |
| 2888 | { |
| 2889 | /* GDesc -> IE transition. |
| 2890 | It's originally: |
| 2891 | call *(%rax) |
| 2892 | |
| 2893 | Change it to: |
| 2894 | nop; nop. */ |
| 2895 | |
| 2896 | unsigned int val, type; |
| 2897 | bfd_vma roff; |
| 2898 | |
| 2899 | /* First, make sure it's a call *(%eax). */ |
| 2900 | roff = rel->r_offset; |
| 2901 | BFD_ASSERT (roff + 2 <= input_section->size); |
| 2902 | type = bfd_get_8 (input_bfd, contents + roff); |
| 2903 | BFD_ASSERT (type == 0xff); |
| 2904 | val = bfd_get_8 (input_bfd, contents + roff + 1); |
| 2905 | BFD_ASSERT (val == 0x10); |
| 2906 | |
| 2907 | /* Now modify the instruction as appropriate. Use |
| 2908 | xchg %ax,%ax instead of 2 nops. */ |
| 2909 | bfd_put_8 (output_bfd, 0x66, contents + roff); |
| 2910 | bfd_put_8 (output_bfd, 0x90, contents + roff + 1); |
| 2911 | |
| 2912 | continue; |
| 2913 | } |
| 2914 | else |
| 2915 | BFD_ASSERT (FALSE); |
| 2916 | break; |
| 2917 | |
| 2918 | case R_X86_64_TLSLD: |
| 2919 | if (! info->shared) |
| 2920 | { |
| 2921 | /* LD->LE transition: |
| 2922 | Ensure it is: |
| 2923 | leaq foo@tlsld(%rip), %rdi; call __tls_get_addr@plt. |
| 2924 | We change it into: |
| 2925 | .word 0x6666; .byte 0x66; movl %fs:0, %rax. */ |
| 2926 | BFD_ASSERT (rel->r_offset >= 3); |
| 2927 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 3) |
| 2928 | == 0x48); |
| 2929 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2) |
| 2930 | == 0x8d); |
| 2931 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 1) |
| 2932 | == 0x3d); |
| 2933 | BFD_ASSERT (rel->r_offset + 9 <= input_section->size); |
| 2934 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) |
| 2935 | == 0xe8); |
| 2936 | BFD_ASSERT (rel + 1 < relend); |
| 2937 | BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); |
| 2938 | memcpy (contents + rel->r_offset - 3, |
| 2939 | "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); |
| 2940 | /* Skip R_X86_64_PLT32. */ |
| 2941 | rel++; |
| 2942 | continue; |
| 2943 | } |
| 2944 | |
| 2945 | if (htab->sgot == NULL) |
| 2946 | abort (); |
| 2947 | |
| 2948 | off = htab->tls_ld_got.offset; |
| 2949 | if (off & 1) |
| 2950 | off &= ~1; |
| 2951 | else |
| 2952 | { |
| 2953 | Elf_Internal_Rela outrel; |
| 2954 | bfd_byte *loc; |
| 2955 | |
| 2956 | if (htab->srelgot == NULL) |
| 2957 | abort (); |
| 2958 | |
| 2959 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2960 | + htab->sgot->output_offset + off); |
| 2961 | |
| 2962 | bfd_put_64 (output_bfd, 0, |
| 2963 | htab->sgot->contents + off); |
| 2964 | bfd_put_64 (output_bfd, 0, |
| 2965 | htab->sgot->contents + off + GOT_ENTRY_SIZE); |
| 2966 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64); |
| 2967 | outrel.r_addend = 0; |
| 2968 | loc = htab->srelgot->contents; |
| 2969 | loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); |
| 2970 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 2971 | htab->tls_ld_got.offset |= 1; |
| 2972 | } |
| 2973 | relocation = htab->sgot->output_section->vma |
| 2974 | + htab->sgot->output_offset + off; |
| 2975 | unresolved_reloc = FALSE; |
| 2976 | break; |
| 2977 | |
| 2978 | case R_X86_64_DTPOFF32: |
| 2979 | if (info->shared || (input_section->flags & SEC_CODE) == 0) |
| 2980 | relocation -= dtpoff_base (info); |
| 2981 | else |
| 2982 | relocation = tpoff (info, relocation); |
| 2983 | break; |
| 2984 | |
| 2985 | case R_X86_64_TPOFF32: |
| 2986 | BFD_ASSERT (! info->shared); |
| 2987 | relocation = tpoff (info, relocation); |
| 2988 | break; |
| 2989 | |
| 2990 | default: |
| 2991 | break; |
| 2992 | } |
| 2993 | |
| 2994 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 2995 | because such sections are not SEC_ALLOC and thus ld.so will |
| 2996 | not process them. */ |
| 2997 | if (unresolved_reloc |
| 2998 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 2999 | && h->def_dynamic)) |
| 3000 | (*_bfd_error_handler) |
| 3001 | (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), |
| 3002 | input_bfd, |
| 3003 | input_section, |
| 3004 | (long) rel->r_offset, |
| 3005 | howto->name, |
| 3006 | h->root.root.string); |
| 3007 | |
| 3008 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 3009 | contents, rel->r_offset, |
| 3010 | relocation, rel->r_addend); |
| 3011 | |
| 3012 | if (r != bfd_reloc_ok) |
| 3013 | { |
| 3014 | const char *name; |
| 3015 | |
| 3016 | if (h != NULL) |
| 3017 | name = h->root.root.string; |
| 3018 | else |
| 3019 | { |
| 3020 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 3021 | symtab_hdr->sh_link, |
| 3022 | sym->st_name); |
| 3023 | if (name == NULL) |
| 3024 | return FALSE; |
| 3025 | if (*name == '\0') |
| 3026 | name = bfd_section_name (input_bfd, sec); |
| 3027 | } |
| 3028 | |
| 3029 | if (r == bfd_reloc_overflow) |
| 3030 | { |
| 3031 | if (! ((*info->callbacks->reloc_overflow) |
| 3032 | (info, (h ? &h->root : NULL), name, howto->name, |
| 3033 | (bfd_vma) 0, input_bfd, input_section, |
| 3034 | rel->r_offset))) |
| 3035 | return FALSE; |
| 3036 | } |
| 3037 | else |
| 3038 | { |
| 3039 | (*_bfd_error_handler) |
| 3040 | (_("%B(%A+0x%lx): reloc against `%s': error %d"), |
| 3041 | input_bfd, input_section, |
| 3042 | (long) rel->r_offset, name, (int) r); |
| 3043 | return FALSE; |
| 3044 | } |
| 3045 | } |
| 3046 | } |
| 3047 | |
| 3048 | return TRUE; |
| 3049 | } |
| 3050 | |
| 3051 | /* Finish up dynamic symbol handling. We set the contents of various |
| 3052 | dynamic sections here. */ |
| 3053 | |
| 3054 | static bfd_boolean |
| 3055 | elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd, |
| 3056 | struct bfd_link_info *info, |
| 3057 | struct elf_link_hash_entry *h, |
| 3058 | Elf_Internal_Sym *sym) |
| 3059 | { |
| 3060 | struct elf64_x86_64_link_hash_table *htab; |
| 3061 | |
| 3062 | htab = elf64_x86_64_hash_table (info); |
| 3063 | |
| 3064 | if (h->plt.offset != (bfd_vma) -1) |
| 3065 | { |
| 3066 | bfd_vma plt_index; |
| 3067 | bfd_vma got_offset; |
| 3068 | Elf_Internal_Rela rela; |
| 3069 | bfd_byte *loc; |
| 3070 | |
| 3071 | /* This symbol has an entry in the procedure linkage table. Set |
| 3072 | it up. */ |
| 3073 | if (h->dynindx == -1 |
| 3074 | || htab->splt == NULL |
| 3075 | || htab->sgotplt == NULL |
| 3076 | || htab->srelplt == NULL) |
| 3077 | abort (); |
| 3078 | |
| 3079 | /* Get the index in the procedure linkage table which |
| 3080 | corresponds to this symbol. This is the index of this symbol |
| 3081 | in all the symbols for which we are making plt entries. The |
| 3082 | first entry in the procedure linkage table is reserved. */ |
| 3083 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 3084 | |
| 3085 | /* Get the offset into the .got table of the entry that |
| 3086 | corresponds to this function. Each .got entry is GOT_ENTRY_SIZE |
| 3087 | bytes. The first three are reserved for the dynamic linker. */ |
| 3088 | got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; |
| 3089 | |
| 3090 | /* Fill in the entry in the procedure linkage table. */ |
| 3091 | memcpy (htab->splt->contents + h->plt.offset, elf64_x86_64_plt_entry, |
| 3092 | PLT_ENTRY_SIZE); |
| 3093 | |
| 3094 | /* Insert the relocation positions of the plt section. The magic |
| 3095 | numbers at the end of the statements are the positions of the |
| 3096 | relocations in the plt section. */ |
| 3097 | /* Put offset for jmp *name@GOTPCREL(%rip), since the |
| 3098 | instruction uses 6 bytes, subtract this value. */ |
| 3099 | bfd_put_32 (output_bfd, |
| 3100 | (htab->sgotplt->output_section->vma |
| 3101 | + htab->sgotplt->output_offset |
| 3102 | + got_offset |
| 3103 | - htab->splt->output_section->vma |
| 3104 | - htab->splt->output_offset |
| 3105 | - h->plt.offset |
| 3106 | - 6), |
| 3107 | htab->splt->contents + h->plt.offset + 2); |
| 3108 | /* Put relocation index. */ |
| 3109 | bfd_put_32 (output_bfd, plt_index, |
| 3110 | htab->splt->contents + h->plt.offset + 7); |
| 3111 | /* Put offset for jmp .PLT0. */ |
| 3112 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| 3113 | htab->splt->contents + h->plt.offset + 12); |
| 3114 | |
| 3115 | /* Fill in the entry in the global offset table, initially this |
| 3116 | points to the pushq instruction in the PLT which is at offset 6. */ |
| 3117 | bfd_put_64 (output_bfd, (htab->splt->output_section->vma |
| 3118 | + htab->splt->output_offset |
| 3119 | + h->plt.offset + 6), |
| 3120 | htab->sgotplt->contents + got_offset); |
| 3121 | |
| 3122 | /* Fill in the entry in the .rela.plt section. */ |
| 3123 | rela.r_offset = (htab->sgotplt->output_section->vma |
| 3124 | + htab->sgotplt->output_offset |
| 3125 | + got_offset); |
| 3126 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT); |
| 3127 | rela.r_addend = 0; |
| 3128 | loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela); |
| 3129 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| 3130 | |
| 3131 | if (!h->def_regular) |
| 3132 | { |
| 3133 | /* Mark the symbol as undefined, rather than as defined in |
| 3134 | the .plt section. Leave the value if there were any |
| 3135 | relocations where pointer equality matters (this is a clue |
| 3136 | for the dynamic linker, to make function pointer |
| 3137 | comparisons work between an application and shared |
| 3138 | library), otherwise set it to zero. If a function is only |
| 3139 | called from a binary, there is no need to slow down |
| 3140 | shared libraries because of that. */ |
| 3141 | sym->st_shndx = SHN_UNDEF; |
| 3142 | if (!h->pointer_equality_needed) |
| 3143 | sym->st_value = 0; |
| 3144 | } |
| 3145 | } |
| 3146 | |
| 3147 | if (h->got.offset != (bfd_vma) -1 |
| 3148 | && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type) |
| 3149 | && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE) |
| 3150 | { |
| 3151 | Elf_Internal_Rela rela; |
| 3152 | bfd_byte *loc; |
| 3153 | |
| 3154 | /* This symbol has an entry in the global offset table. Set it |
| 3155 | up. */ |
| 3156 | if (htab->sgot == NULL || htab->srelgot == NULL) |
| 3157 | abort (); |
| 3158 | |
| 3159 | rela.r_offset = (htab->sgot->output_section->vma |
| 3160 | + htab->sgot->output_offset |
| 3161 | + (h->got.offset &~ (bfd_vma) 1)); |
| 3162 | |
| 3163 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 3164 | symbol is defined locally or was forced to be local because |
| 3165 | of a version file, we just want to emit a RELATIVE reloc. |
| 3166 | The entry in the global offset table will already have been |
| 3167 | initialized in the relocate_section function. */ |
| 3168 | if (info->shared |
| 3169 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 3170 | { |
| 3171 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 3172 | rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); |
| 3173 | rela.r_addend = (h->root.u.def.value |
| 3174 | + h->root.u.def.section->output_section->vma |
| 3175 | + h->root.u.def.section->output_offset); |
| 3176 | } |
| 3177 | else |
| 3178 | { |
| 3179 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 3180 | bfd_put_64 (output_bfd, (bfd_vma) 0, |
| 3181 | htab->sgot->contents + h->got.offset); |
| 3182 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT); |
| 3183 | rela.r_addend = 0; |
| 3184 | } |
| 3185 | |
| 3186 | loc = htab->srelgot->contents; |
| 3187 | loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); |
| 3188 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| 3189 | } |
| 3190 | |
| 3191 | if (h->needs_copy) |
| 3192 | { |
| 3193 | Elf_Internal_Rela rela; |
| 3194 | bfd_byte *loc; |
| 3195 | |
| 3196 | /* This symbol needs a copy reloc. Set it up. */ |
| 3197 | |
| 3198 | if (h->dynindx == -1 |
| 3199 | || (h->root.type != bfd_link_hash_defined |
| 3200 | && h->root.type != bfd_link_hash_defweak) |
| 3201 | || htab->srelbss == NULL) |
| 3202 | abort (); |
| 3203 | |
| 3204 | rela.r_offset = (h->root.u.def.value |
| 3205 | + h->root.u.def.section->output_section->vma |
| 3206 | + h->root.u.def.section->output_offset); |
| 3207 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY); |
| 3208 | rela.r_addend = 0; |
| 3209 | loc = htab->srelbss->contents; |
| 3210 | loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela); |
| 3211 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| 3212 | } |
| 3213 | |
| 3214 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| 3215 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 3216 | || h == htab->elf.hgot) |
| 3217 | sym->st_shndx = SHN_ABS; |
| 3218 | |
| 3219 | return TRUE; |
| 3220 | } |
| 3221 | |
| 3222 | /* Used to decide how to sort relocs in an optimal manner for the |
| 3223 | dynamic linker, before writing them out. */ |
| 3224 | |
| 3225 | static enum elf_reloc_type_class |
| 3226 | elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela) |
| 3227 | { |
| 3228 | switch ((int) ELF64_R_TYPE (rela->r_info)) |
| 3229 | { |
| 3230 | case R_X86_64_RELATIVE: |
| 3231 | return reloc_class_relative; |
| 3232 | case R_X86_64_JUMP_SLOT: |
| 3233 | return reloc_class_plt; |
| 3234 | case R_X86_64_COPY: |
| 3235 | return reloc_class_copy; |
| 3236 | default: |
| 3237 | return reloc_class_normal; |
| 3238 | } |
| 3239 | } |
| 3240 | |
| 3241 | /* Finish up the dynamic sections. */ |
| 3242 | |
| 3243 | static bfd_boolean |
| 3244 | elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) |
| 3245 | { |
| 3246 | struct elf64_x86_64_link_hash_table *htab; |
| 3247 | bfd *dynobj; |
| 3248 | asection *sdyn; |
| 3249 | |
| 3250 | htab = elf64_x86_64_hash_table (info); |
| 3251 | dynobj = htab->elf.dynobj; |
| 3252 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 3253 | |
| 3254 | if (htab->elf.dynamic_sections_created) |
| 3255 | { |
| 3256 | Elf64_External_Dyn *dyncon, *dynconend; |
| 3257 | |
| 3258 | if (sdyn == NULL || htab->sgot == NULL) |
| 3259 | abort (); |
| 3260 | |
| 3261 | dyncon = (Elf64_External_Dyn *) sdyn->contents; |
| 3262 | dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); |
| 3263 | for (; dyncon < dynconend; dyncon++) |
| 3264 | { |
| 3265 | Elf_Internal_Dyn dyn; |
| 3266 | asection *s; |
| 3267 | |
| 3268 | bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); |
| 3269 | |
| 3270 | switch (dyn.d_tag) |
| 3271 | { |
| 3272 | default: |
| 3273 | continue; |
| 3274 | |
| 3275 | case DT_PLTGOT: |
| 3276 | s = htab->sgotplt; |
| 3277 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; |
| 3278 | break; |
| 3279 | |
| 3280 | case DT_JMPREL: |
| 3281 | dyn.d_un.d_ptr = htab->srelplt->output_section->vma; |
| 3282 | break; |
| 3283 | |
| 3284 | case DT_PLTRELSZ: |
| 3285 | s = htab->srelplt->output_section; |
| 3286 | dyn.d_un.d_val = s->size; |
| 3287 | break; |
| 3288 | |
| 3289 | case DT_RELASZ: |
| 3290 | /* The procedure linkage table relocs (DT_JMPREL) should |
| 3291 | not be included in the overall relocs (DT_RELA). |
| 3292 | Therefore, we override the DT_RELASZ entry here to |
| 3293 | make it not include the JMPREL relocs. Since the |
| 3294 | linker script arranges for .rela.plt to follow all |
| 3295 | other relocation sections, we don't have to worry |
| 3296 | about changing the DT_RELA entry. */ |
| 3297 | if (htab->srelplt != NULL) |
| 3298 | { |
| 3299 | s = htab->srelplt->output_section; |
| 3300 | dyn.d_un.d_val -= s->size; |
| 3301 | } |
| 3302 | break; |
| 3303 | |
| 3304 | case DT_TLSDESC_PLT: |
| 3305 | s = htab->splt; |
| 3306 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset |
| 3307 | + htab->tlsdesc_plt; |
| 3308 | break; |
| 3309 | |
| 3310 | case DT_TLSDESC_GOT: |
| 3311 | s = htab->sgot; |
| 3312 | dyn.d_un.d_ptr = s->output_section->vma + s->output_offset |
| 3313 | + htab->tlsdesc_got; |
| 3314 | break; |
| 3315 | } |
| 3316 | |
| 3317 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 3318 | } |
| 3319 | |
| 3320 | /* Fill in the special first entry in the procedure linkage table. */ |
| 3321 | if (htab->splt && htab->splt->size > 0) |
| 3322 | { |
| 3323 | /* Fill in the first entry in the procedure linkage table. */ |
| 3324 | memcpy (htab->splt->contents, elf64_x86_64_plt0_entry, |
| 3325 | PLT_ENTRY_SIZE); |
| 3326 | /* Add offset for pushq GOT+8(%rip), since the instruction |
| 3327 | uses 6 bytes subtract this value. */ |
| 3328 | bfd_put_32 (output_bfd, |
| 3329 | (htab->sgotplt->output_section->vma |
| 3330 | + htab->sgotplt->output_offset |
| 3331 | + 8 |
| 3332 | - htab->splt->output_section->vma |
| 3333 | - htab->splt->output_offset |
| 3334 | - 6), |
| 3335 | htab->splt->contents + 2); |
| 3336 | /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to |
| 3337 | the end of the instruction. */ |
| 3338 | bfd_put_32 (output_bfd, |
| 3339 | (htab->sgotplt->output_section->vma |
| 3340 | + htab->sgotplt->output_offset |
| 3341 | + 16 |
| 3342 | - htab->splt->output_section->vma |
| 3343 | - htab->splt->output_offset |
| 3344 | - 12), |
| 3345 | htab->splt->contents + 8); |
| 3346 | |
| 3347 | elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize = |
| 3348 | PLT_ENTRY_SIZE; |
| 3349 | |
| 3350 | if (htab->tlsdesc_plt) |
| 3351 | { |
| 3352 | bfd_put_64 (output_bfd, (bfd_vma) 0, |
| 3353 | htab->sgot->contents + htab->tlsdesc_got); |
| 3354 | |
| 3355 | memcpy (htab->splt->contents + htab->tlsdesc_plt, |
| 3356 | elf64_x86_64_plt0_entry, |
| 3357 | PLT_ENTRY_SIZE); |
| 3358 | |
| 3359 | /* Add offset for pushq GOT+8(%rip), since the |
| 3360 | instruction uses 6 bytes subtract this value. */ |
| 3361 | bfd_put_32 (output_bfd, |
| 3362 | (htab->sgotplt->output_section->vma |
| 3363 | + htab->sgotplt->output_offset |
| 3364 | + 8 |
| 3365 | - htab->splt->output_section->vma |
| 3366 | - htab->splt->output_offset |
| 3367 | - htab->tlsdesc_plt |
| 3368 | - 6), |
| 3369 | htab->splt->contents + htab->tlsdesc_plt + 2); |
| 3370 | /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for |
| 3371 | htab->tlsdesc_got. The 12 is the offset to the end of |
| 3372 | the instruction. */ |
| 3373 | bfd_put_32 (output_bfd, |
| 3374 | (htab->sgot->output_section->vma |
| 3375 | + htab->sgot->output_offset |
| 3376 | + htab->tlsdesc_got |
| 3377 | - htab->splt->output_section->vma |
| 3378 | - htab->splt->output_offset |
| 3379 | - htab->tlsdesc_plt |
| 3380 | - 12), |
| 3381 | htab->splt->contents + htab->tlsdesc_plt + 8); |
| 3382 | } |
| 3383 | } |
| 3384 | } |
| 3385 | |
| 3386 | if (htab->sgotplt) |
| 3387 | { |
| 3388 | /* Fill in the first three entries in the global offset table. */ |
| 3389 | if (htab->sgotplt->size > 0) |
| 3390 | { |
| 3391 | /* Set the first entry in the global offset table to the address of |
| 3392 | the dynamic section. */ |
| 3393 | if (sdyn == NULL) |
| 3394 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents); |
| 3395 | else |
| 3396 | bfd_put_64 (output_bfd, |
| 3397 | sdyn->output_section->vma + sdyn->output_offset, |
| 3398 | htab->sgotplt->contents); |
| 3399 | /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ |
| 3400 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE); |
| 3401 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2); |
| 3402 | } |
| 3403 | |
| 3404 | elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = |
| 3405 | GOT_ENTRY_SIZE; |
| 3406 | } |
| 3407 | |
| 3408 | if (htab->sgot && htab->sgot->size > 0) |
| 3409 | elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize |
| 3410 | = GOT_ENTRY_SIZE; |
| 3411 | |
| 3412 | return TRUE; |
| 3413 | } |
| 3414 | |
| 3415 | /* Return address for Ith PLT stub in section PLT, for relocation REL |
| 3416 | or (bfd_vma) -1 if it should not be included. */ |
| 3417 | |
| 3418 | static bfd_vma |
| 3419 | elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt, |
| 3420 | const arelent *rel ATTRIBUTE_UNUSED) |
| 3421 | { |
| 3422 | return plt->vma + (i + 1) * PLT_ENTRY_SIZE; |
| 3423 | } |
| 3424 | |
| 3425 | /* Handle an x86-64 specific section when reading an object file. This |
| 3426 | is called when elfcode.h finds a section with an unknown type. */ |
| 3427 | |
| 3428 | static bfd_boolean |
| 3429 | elf64_x86_64_section_from_shdr (bfd *abfd, |
| 3430 | Elf_Internal_Shdr *hdr, |
| 3431 | const char *name, |
| 3432 | int shindex) |
| 3433 | { |
| 3434 | if (hdr->sh_type != SHT_X86_64_UNWIND) |
| 3435 | return FALSE; |
| 3436 | |
| 3437 | if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) |
| 3438 | return FALSE; |
| 3439 | |
| 3440 | return TRUE; |
| 3441 | } |
| 3442 | |
| 3443 | /* Hook called by the linker routine which adds symbols from an object |
| 3444 | file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead |
| 3445 | of .bss. */ |
| 3446 | |
| 3447 | static bfd_boolean |
| 3448 | elf64_x86_64_add_symbol_hook (bfd *abfd, |
| 3449 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 3450 | Elf_Internal_Sym *sym, |
| 3451 | const char **namep ATTRIBUTE_UNUSED, |
| 3452 | flagword *flagsp ATTRIBUTE_UNUSED, |
| 3453 | asection **secp, bfd_vma *valp) |
| 3454 | { |
| 3455 | asection *lcomm; |
| 3456 | |
| 3457 | switch (sym->st_shndx) |
| 3458 | { |
| 3459 | case SHN_X86_64_LCOMMON: |
| 3460 | lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON"); |
| 3461 | if (lcomm == NULL) |
| 3462 | { |
| 3463 | lcomm = bfd_make_section_with_flags (abfd, |
| 3464 | "LARGE_COMMON", |
| 3465 | (SEC_ALLOC |
| 3466 | | SEC_IS_COMMON |
| 3467 | | SEC_LINKER_CREATED)); |
| 3468 | if (lcomm == NULL) |
| 3469 | return FALSE; |
| 3470 | elf_section_flags (lcomm) |= SHF_X86_64_LARGE; |
| 3471 | } |
| 3472 | *secp = lcomm; |
| 3473 | *valp = sym->st_size; |
| 3474 | break; |
| 3475 | } |
| 3476 | return TRUE; |
| 3477 | } |
| 3478 | |
| 3479 | |
| 3480 | /* Given a BFD section, try to locate the corresponding ELF section |
| 3481 | index. */ |
| 3482 | |
| 3483 | static bfd_boolean |
| 3484 | elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, |
| 3485 | asection *sec, int *index) |
| 3486 | { |
| 3487 | if (sec == &_bfd_elf_large_com_section) |
| 3488 | { |
| 3489 | *index = SHN_X86_64_LCOMMON; |
| 3490 | return TRUE; |
| 3491 | } |
| 3492 | return FALSE; |
| 3493 | } |
| 3494 | |
| 3495 | /* Process a symbol. */ |
| 3496 | |
| 3497 | static void |
| 3498 | elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, |
| 3499 | asymbol *asym) |
| 3500 | { |
| 3501 | elf_symbol_type *elfsym = (elf_symbol_type *) asym; |
| 3502 | |
| 3503 | switch (elfsym->internal_elf_sym.st_shndx) |
| 3504 | { |
| 3505 | case SHN_X86_64_LCOMMON: |
| 3506 | asym->section = &_bfd_elf_large_com_section; |
| 3507 | asym->value = elfsym->internal_elf_sym.st_size; |
| 3508 | /* Common symbol doesn't set BSF_GLOBAL. */ |
| 3509 | asym->flags &= ~BSF_GLOBAL; |
| 3510 | break; |
| 3511 | } |
| 3512 | } |
| 3513 | |
| 3514 | static bfd_boolean |
| 3515 | elf64_x86_64_common_definition (Elf_Internal_Sym *sym) |
| 3516 | { |
| 3517 | return (sym->st_shndx == SHN_COMMON |
| 3518 | || sym->st_shndx == SHN_X86_64_LCOMMON); |
| 3519 | } |
| 3520 | |
| 3521 | static unsigned int |
| 3522 | elf64_x86_64_common_section_index (asection *sec) |
| 3523 | { |
| 3524 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) |
| 3525 | return SHN_COMMON; |
| 3526 | else |
| 3527 | return SHN_X86_64_LCOMMON; |
| 3528 | } |
| 3529 | |
| 3530 | static asection * |
| 3531 | elf64_x86_64_common_section (asection *sec) |
| 3532 | { |
| 3533 | if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0) |
| 3534 | return bfd_com_section_ptr; |
| 3535 | else |
| 3536 | return &_bfd_elf_large_com_section; |
| 3537 | } |
| 3538 | |
| 3539 | static bfd_boolean |
| 3540 | elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 3541 | struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED, |
| 3542 | struct elf_link_hash_entry *h, |
| 3543 | Elf_Internal_Sym *sym, |
| 3544 | asection **psec, |
| 3545 | bfd_vma *pvalue ATTRIBUTE_UNUSED, |
| 3546 | unsigned int *pold_alignment ATTRIBUTE_UNUSED, |
| 3547 | bfd_boolean *skip ATTRIBUTE_UNUSED, |
| 3548 | bfd_boolean *override ATTRIBUTE_UNUSED, |
| 3549 | bfd_boolean *type_change_ok ATTRIBUTE_UNUSED, |
| 3550 | bfd_boolean *size_change_ok ATTRIBUTE_UNUSED, |
| 3551 | bfd_boolean *newdef ATTRIBUTE_UNUSED, |
| 3552 | bfd_boolean *newdyn, |
| 3553 | bfd_boolean *newdyncommon ATTRIBUTE_UNUSED, |
| 3554 | bfd_boolean *newweak ATTRIBUTE_UNUSED, |
| 3555 | bfd *abfd ATTRIBUTE_UNUSED, |
| 3556 | asection **sec, |
| 3557 | bfd_boolean *olddef ATTRIBUTE_UNUSED, |
| 3558 | bfd_boolean *olddyn, |
| 3559 | bfd_boolean *olddyncommon ATTRIBUTE_UNUSED, |
| 3560 | bfd_boolean *oldweak ATTRIBUTE_UNUSED, |
| 3561 | bfd *oldbfd, |
| 3562 | asection **oldsec) |
| 3563 | { |
| 3564 | /* A normal common symbol and a large common symbol result in a |
| 3565 | normal common symbol. We turn the large common symbol into a |
| 3566 | normal one. */ |
| 3567 | if (!*olddyn |
| 3568 | && h->root.type == bfd_link_hash_common |
| 3569 | && !*newdyn |
| 3570 | && bfd_is_com_section (*sec) |
| 3571 | && *oldsec != *sec) |
| 3572 | { |
| 3573 | if (sym->st_shndx == SHN_COMMON |
| 3574 | && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0) |
| 3575 | { |
| 3576 | h->root.u.c.p->section |
| 3577 | = bfd_make_section_old_way (oldbfd, "COMMON"); |
| 3578 | h->root.u.c.p->section->flags = SEC_ALLOC; |
| 3579 | } |
| 3580 | else if (sym->st_shndx == SHN_X86_64_LCOMMON |
| 3581 | && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0) |
| 3582 | *psec = *sec = bfd_com_section_ptr; |
| 3583 | } |
| 3584 | |
| 3585 | return TRUE; |
| 3586 | } |
| 3587 | |
| 3588 | static int |
| 3589 | elf64_x86_64_additional_program_headers (bfd *abfd, |
| 3590 | struct bfd_link_info *info ATTRIBUTE_UNUSED) |
| 3591 | { |
| 3592 | asection *s; |
| 3593 | int count = 0; |
| 3594 | |
| 3595 | /* Check to see if we need a large readonly segment. */ |
| 3596 | s = bfd_get_section_by_name (abfd, ".lrodata"); |
| 3597 | if (s && (s->flags & SEC_LOAD)) |
| 3598 | count++; |
| 3599 | |
| 3600 | /* Check to see if we need a large data segment. Since .lbss sections |
| 3601 | is placed right after the .bss section, there should be no need for |
| 3602 | a large data segment just because of .lbss. */ |
| 3603 | s = bfd_get_section_by_name (abfd, ".ldata"); |
| 3604 | if (s && (s->flags & SEC_LOAD)) |
| 3605 | count++; |
| 3606 | |
| 3607 | return count; |
| 3608 | } |
| 3609 | |
| 3610 | /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ |
| 3611 | |
| 3612 | static bfd_boolean |
| 3613 | elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h) |
| 3614 | { |
| 3615 | if (h->plt.offset != (bfd_vma) -1 |
| 3616 | && !h->def_regular |
| 3617 | && !h->pointer_equality_needed) |
| 3618 | return FALSE; |
| 3619 | |
| 3620 | return _bfd_elf_hash_symbol (h); |
| 3621 | } |
| 3622 | |
| 3623 | static const struct bfd_elf_special_section |
| 3624 | elf64_x86_64_special_sections[]= |
| 3625 | { |
| 3626 | { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 3627 | { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, |
| 3628 | { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE}, |
| 3629 | { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 3630 | { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE}, |
| 3631 | { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE}, |
| 3632 | { NULL, 0, 0, 0, 0 } |
| 3633 | }; |
| 3634 | |
| 3635 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec |
| 3636 | #define TARGET_LITTLE_NAME "elf64-x86-64" |
| 3637 | #define ELF_ARCH bfd_arch_i386 |
| 3638 | #define ELF_MACHINE_CODE EM_X86_64 |
| 3639 | #define ELF_MAXPAGESIZE 0x200000 |
| 3640 | #define ELF_MINPAGESIZE 0x1000 |
| 3641 | #define ELF_COMMONPAGESIZE 0x1000 |
| 3642 | |
| 3643 | #define elf_backend_can_gc_sections 1 |
| 3644 | #define elf_backend_can_refcount 1 |
| 3645 | #define elf_backend_want_got_plt 1 |
| 3646 | #define elf_backend_plt_readonly 1 |
| 3647 | #define elf_backend_want_plt_sym 0 |
| 3648 | #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) |
| 3649 | #define elf_backend_rela_normal 1 |
| 3650 | |
| 3651 | #define elf_info_to_howto elf64_x86_64_info_to_howto |
| 3652 | |
| 3653 | #define bfd_elf64_bfd_link_hash_table_create \ |
| 3654 | elf64_x86_64_link_hash_table_create |
| 3655 | #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup |
| 3656 | #define bfd_elf64_bfd_reloc_name_lookup \ |
| 3657 | elf64_x86_64_reloc_name_lookup |
| 3658 | |
| 3659 | #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol |
| 3660 | #define elf_backend_check_relocs elf64_x86_64_check_relocs |
| 3661 | #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol |
| 3662 | #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections |
| 3663 | #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections |
| 3664 | #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol |
| 3665 | #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook |
| 3666 | #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook |
| 3667 | #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus |
| 3668 | #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo |
| 3669 | #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class |
| 3670 | #define elf_backend_relocate_section elf64_x86_64_relocate_section |
| 3671 | #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections |
| 3672 | #define elf_backend_always_size_sections elf64_x86_64_always_size_sections |
| 3673 | #define elf_backend_init_index_section _bfd_elf_init_1_index_section |
| 3674 | #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val |
| 3675 | #define elf_backend_object_p elf64_x86_64_elf_object_p |
| 3676 | #define bfd_elf64_mkobject elf64_x86_64_mkobject |
| 3677 | |
| 3678 | #define elf_backend_section_from_shdr \ |
| 3679 | elf64_x86_64_section_from_shdr |
| 3680 | |
| 3681 | #define elf_backend_section_from_bfd_section \ |
| 3682 | elf64_x86_64_elf_section_from_bfd_section |
| 3683 | #define elf_backend_add_symbol_hook \ |
| 3684 | elf64_x86_64_add_symbol_hook |
| 3685 | #define elf_backend_symbol_processing \ |
| 3686 | elf64_x86_64_symbol_processing |
| 3687 | #define elf_backend_common_section_index \ |
| 3688 | elf64_x86_64_common_section_index |
| 3689 | #define elf_backend_common_section \ |
| 3690 | elf64_x86_64_common_section |
| 3691 | #define elf_backend_common_definition \ |
| 3692 | elf64_x86_64_common_definition |
| 3693 | #define elf_backend_merge_symbol \ |
| 3694 | elf64_x86_64_merge_symbol |
| 3695 | #define elf_backend_special_sections \ |
| 3696 | elf64_x86_64_special_sections |
| 3697 | #define elf_backend_additional_program_headers \ |
| 3698 | elf64_x86_64_additional_program_headers |
| 3699 | #define elf_backend_hash_symbol \ |
| 3700 | elf64_x86_64_hash_symbol |
| 3701 | |
| 3702 | #include "elf64-target.h" |
| 3703 | |
| 3704 | /* FreeBSD support. */ |
| 3705 | |
| 3706 | #undef TARGET_LITTLE_SYM |
| 3707 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec |
| 3708 | #undef TARGET_LITTLE_NAME |
| 3709 | #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd" |
| 3710 | |
| 3711 | #undef ELF_OSABI |
| 3712 | #define ELF_OSABI ELFOSABI_FREEBSD |
| 3713 | |
| 3714 | #undef elf_backend_post_process_headers |
| 3715 | #define elf_backend_post_process_headers _bfd_elf_set_osabi |
| 3716 | |
| 3717 | #undef elf64_bed |
| 3718 | #define elf64_bed elf64_x86_64_fbsd_bed |
| 3719 | |
| 3720 | #include "elf64-target.h" |