| 1 | /* X86-64 specific support for 64-bit ELF |
| 2 | Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc. |
| 3 | Contributed by Jan Hubicka <jh@suse.cz>. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "bfd.h" |
| 22 | #include "sysdep.h" |
| 23 | #include "bfdlink.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "elf-bfd.h" |
| 26 | |
| 27 | #include "elf/x86-64.h" |
| 28 | |
| 29 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ |
| 30 | #define MINUS_ONE (~ (bfd_vma) 0) |
| 31 | |
| 32 | /* The relocation "howto" table. Order of fields: |
| 33 | type, size, bitsize, pc_relative, complain_on_overflow, |
| 34 | special_function, name, partial_inplace, src_mask, dst_pack, pcrel_offset. */ |
| 35 | static reloc_howto_type x86_64_elf_howto_table[] = |
| 36 | { |
| 37 | HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont, |
| 38 | bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000, |
| 39 | FALSE), |
| 40 | HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 41 | bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE, |
| 42 | FALSE), |
| 43 | HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 44 | bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff, |
| 45 | TRUE), |
| 46 | HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 47 | bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff, |
| 48 | FALSE), |
| 49 | HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 50 | bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff, |
| 51 | TRUE), |
| 52 | HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 53 | bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff, |
| 54 | FALSE), |
| 55 | HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 56 | bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE, |
| 57 | MINUS_ONE, FALSE), |
| 58 | HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 59 | bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE, |
| 60 | MINUS_ONE, FALSE), |
| 61 | HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 62 | bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE, |
| 63 | MINUS_ONE, FALSE), |
| 64 | HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 65 | bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff, |
| 66 | 0xffffffff, TRUE), |
| 67 | HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned, |
| 68 | bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff, |
| 69 | FALSE), |
| 70 | HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 71 | bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff, |
| 72 | FALSE), |
| 73 | HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, |
| 74 | bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE), |
| 75 | HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield, |
| 76 | bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE), |
| 77 | HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_signed, |
| 78 | bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE), |
| 79 | HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed, |
| 80 | bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE), |
| 81 | HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 82 | bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE, |
| 83 | MINUS_ONE, FALSE), |
| 84 | HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 85 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE, |
| 86 | MINUS_ONE, FALSE), |
| 87 | HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield, |
| 88 | bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE, |
| 89 | MINUS_ONE, FALSE), |
| 90 | HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 91 | bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff, |
| 92 | 0xffffffff, TRUE), |
| 93 | HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 94 | bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff, |
| 95 | 0xffffffff, TRUE), |
| 96 | HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 97 | bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff, |
| 98 | 0xffffffff, FALSE), |
| 99 | HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 100 | bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff, |
| 101 | 0xffffffff, TRUE), |
| 102 | HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 103 | bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff, |
| 104 | 0xffffffff, FALSE), |
| 105 | |
| 106 | /* GNU extension to record C++ vtable hierarchy. */ |
| 107 | HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| 108 | NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE), |
| 109 | |
| 110 | /* GNU extension to record C++ vtable member usage. */ |
| 111 | HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont, |
| 112 | _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0, |
| 113 | FALSE) |
| 114 | }; |
| 115 | |
| 116 | /* Map BFD relocs to the x86_64 elf relocs. */ |
| 117 | struct elf_reloc_map |
| 118 | { |
| 119 | bfd_reloc_code_real_type bfd_reloc_val; |
| 120 | unsigned char elf_reloc_val; |
| 121 | }; |
| 122 | |
| 123 | static const struct elf_reloc_map x86_64_reloc_map[] = |
| 124 | { |
| 125 | { BFD_RELOC_NONE, R_X86_64_NONE, }, |
| 126 | { BFD_RELOC_64, R_X86_64_64, }, |
| 127 | { BFD_RELOC_32_PCREL, R_X86_64_PC32, }, |
| 128 | { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,}, |
| 129 | { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,}, |
| 130 | { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, }, |
| 131 | { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, }, |
| 132 | { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, }, |
| 133 | { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, }, |
| 134 | { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, }, |
| 135 | { BFD_RELOC_32, R_X86_64_32, }, |
| 136 | { BFD_RELOC_X86_64_32S, R_X86_64_32S, }, |
| 137 | { BFD_RELOC_16, R_X86_64_16, }, |
| 138 | { BFD_RELOC_16_PCREL, R_X86_64_PC16, }, |
| 139 | { BFD_RELOC_8, R_X86_64_8, }, |
| 140 | { BFD_RELOC_8_PCREL, R_X86_64_PC8, }, |
| 141 | { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, }, |
| 142 | { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, }, |
| 143 | { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, }, |
| 144 | { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, }, |
| 145 | { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, }, |
| 146 | { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, }, |
| 147 | { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, }, |
| 148 | { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, }, |
| 149 | { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, }, |
| 150 | { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, }, |
| 151 | }; |
| 152 | |
| 153 | |
| 154 | /* Given a BFD reloc type, return a HOWTO structure. */ |
| 155 | static reloc_howto_type * |
| 156 | elf64_x86_64_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 157 | bfd_reloc_code_real_type code) |
| 158 | { |
| 159 | unsigned int i; |
| 160 | |
| 161 | for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map); |
| 162 | i++) |
| 163 | { |
| 164 | if (x86_64_reloc_map[i].bfd_reloc_val == code) |
| 165 | return &x86_64_elf_howto_table[i]; |
| 166 | } |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | /* Given an x86_64 ELF reloc type, fill in an arelent structure. */ |
| 171 | |
| 172 | static void |
| 173 | elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, |
| 174 | Elf_Internal_Rela *dst) |
| 175 | { |
| 176 | unsigned r_type, i; |
| 177 | |
| 178 | r_type = ELF64_R_TYPE (dst->r_info); |
| 179 | if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT) |
| 180 | { |
| 181 | BFD_ASSERT (r_type <= (unsigned int) R_X86_64_TPOFF32); |
| 182 | i = r_type; |
| 183 | } |
| 184 | else |
| 185 | { |
| 186 | BFD_ASSERT (r_type < (unsigned int) R_X86_64_max); |
| 187 | i = r_type - ((unsigned int) R_X86_64_GNU_VTINHERIT - R_X86_64_TPOFF32 - 1); |
| 188 | } |
| 189 | cache_ptr->howto = &x86_64_elf_howto_table[i]; |
| 190 | BFD_ASSERT (r_type == cache_ptr->howto->type); |
| 191 | } |
| 192 | \f |
| 193 | /* Support for core dump NOTE sections. */ |
| 194 | static bfd_boolean |
| 195 | elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) |
| 196 | { |
| 197 | int offset; |
| 198 | size_t raw_size; |
| 199 | |
| 200 | switch (note->descsz) |
| 201 | { |
| 202 | default: |
| 203 | return FALSE; |
| 204 | |
| 205 | case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */ |
| 206 | /* pr_cursig */ |
| 207 | elf_tdata (abfd)->core_signal |
| 208 | = bfd_get_16 (abfd, note->descdata + 12); |
| 209 | |
| 210 | /* pr_pid */ |
| 211 | elf_tdata (abfd)->core_pid |
| 212 | = bfd_get_32 (abfd, note->descdata + 32); |
| 213 | |
| 214 | /* pr_reg */ |
| 215 | offset = 112; |
| 216 | raw_size = 216; |
| 217 | |
| 218 | break; |
| 219 | } |
| 220 | |
| 221 | /* Make a ".reg/999" section. */ |
| 222 | return _bfd_elfcore_make_pseudosection (abfd, ".reg", |
| 223 | raw_size, note->descpos + offset); |
| 224 | } |
| 225 | |
| 226 | static bfd_boolean |
| 227 | elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) |
| 228 | { |
| 229 | switch (note->descsz) |
| 230 | { |
| 231 | default: |
| 232 | return FALSE; |
| 233 | |
| 234 | case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */ |
| 235 | elf_tdata (abfd)->core_program |
| 236 | = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); |
| 237 | elf_tdata (abfd)->core_command |
| 238 | = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); |
| 239 | } |
| 240 | |
| 241 | /* Note that for some reason, a spurious space is tacked |
| 242 | onto the end of the args in some (at least one anyway) |
| 243 | implementations, so strip it off if it exists. */ |
| 244 | |
| 245 | { |
| 246 | char *command = elf_tdata (abfd)->core_command; |
| 247 | int n = strlen (command); |
| 248 | |
| 249 | if (0 < n && command[n - 1] == ' ') |
| 250 | command[n - 1] = '\0'; |
| 251 | } |
| 252 | |
| 253 | return TRUE; |
| 254 | } |
| 255 | \f |
| 256 | /* Functions for the x86-64 ELF linker. */ |
| 257 | |
| 258 | /* The name of the dynamic interpreter. This is put in the .interp |
| 259 | section. */ |
| 260 | |
| 261 | #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1" |
| 262 | |
| 263 | /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid |
| 264 | copying dynamic variables from a shared lib into an app's dynbss |
| 265 | section, and instead use a dynamic relocation to point into the |
| 266 | shared lib. */ |
| 267 | #define ELIMINATE_COPY_RELOCS 1 |
| 268 | |
| 269 | /* The size in bytes of an entry in the global offset table. */ |
| 270 | |
| 271 | #define GOT_ENTRY_SIZE 8 |
| 272 | |
| 273 | /* The size in bytes of an entry in the procedure linkage table. */ |
| 274 | |
| 275 | #define PLT_ENTRY_SIZE 16 |
| 276 | |
| 277 | /* The first entry in a procedure linkage table looks like this. See the |
| 278 | SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */ |
| 279 | |
| 280 | static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] = |
| 281 | { |
| 282 | 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */ |
| 283 | 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */ |
| 284 | 0x90, 0x90, 0x90, 0x90 /* pad out to 16 bytes with nops. */ |
| 285 | }; |
| 286 | |
| 287 | /* Subsequent entries in a procedure linkage table look like this. */ |
| 288 | |
| 289 | static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] = |
| 290 | { |
| 291 | 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */ |
| 292 | 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */ |
| 293 | 0x68, /* pushq immediate */ |
| 294 | 0, 0, 0, 0, /* replaced with index into relocation table. */ |
| 295 | 0xe9, /* jmp relative */ |
| 296 | 0, 0, 0, 0 /* replaced with offset to start of .plt0. */ |
| 297 | }; |
| 298 | |
| 299 | /* The x86-64 linker needs to keep track of the number of relocs that |
| 300 | it decides to copy as dynamic relocs in check_relocs for each symbol. |
| 301 | This is so that it can later discard them if they are found to be |
| 302 | unnecessary. We store the information in a field extending the |
| 303 | regular ELF linker hash table. */ |
| 304 | |
| 305 | struct elf64_x86_64_dyn_relocs |
| 306 | { |
| 307 | /* Next section. */ |
| 308 | struct elf64_x86_64_dyn_relocs *next; |
| 309 | |
| 310 | /* The input section of the reloc. */ |
| 311 | asection *sec; |
| 312 | |
| 313 | /* Total number of relocs copied for the input section. */ |
| 314 | bfd_size_type count; |
| 315 | |
| 316 | /* Number of pc-relative relocs copied for the input section. */ |
| 317 | bfd_size_type pc_count; |
| 318 | }; |
| 319 | |
| 320 | /* x86-64 ELF linker hash entry. */ |
| 321 | |
| 322 | struct elf64_x86_64_link_hash_entry |
| 323 | { |
| 324 | struct elf_link_hash_entry elf; |
| 325 | |
| 326 | /* Track dynamic relocs copied for this symbol. */ |
| 327 | struct elf64_x86_64_dyn_relocs *dyn_relocs; |
| 328 | |
| 329 | #define GOT_UNKNOWN 0 |
| 330 | #define GOT_NORMAL 1 |
| 331 | #define GOT_TLS_GD 2 |
| 332 | #define GOT_TLS_IE 3 |
| 333 | unsigned char tls_type; |
| 334 | }; |
| 335 | |
| 336 | #define elf64_x86_64_hash_entry(ent) \ |
| 337 | ((struct elf64_x86_64_link_hash_entry *)(ent)) |
| 338 | |
| 339 | struct elf64_x86_64_obj_tdata |
| 340 | { |
| 341 | struct elf_obj_tdata root; |
| 342 | |
| 343 | /* tls_type for each local got entry. */ |
| 344 | char *local_got_tls_type; |
| 345 | }; |
| 346 | |
| 347 | #define elf64_x86_64_tdata(abfd) \ |
| 348 | ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any) |
| 349 | |
| 350 | #define elf64_x86_64_local_got_tls_type(abfd) \ |
| 351 | (elf64_x86_64_tdata (abfd)->local_got_tls_type) |
| 352 | |
| 353 | |
| 354 | /* x86-64 ELF linker hash table. */ |
| 355 | |
| 356 | struct elf64_x86_64_link_hash_table |
| 357 | { |
| 358 | struct elf_link_hash_table elf; |
| 359 | |
| 360 | /* Short-cuts to get to dynamic linker sections. */ |
| 361 | asection *sgot; |
| 362 | asection *sgotplt; |
| 363 | asection *srelgot; |
| 364 | asection *splt; |
| 365 | asection *srelplt; |
| 366 | asection *sdynbss; |
| 367 | asection *srelbss; |
| 368 | |
| 369 | union { |
| 370 | bfd_signed_vma refcount; |
| 371 | bfd_vma offset; |
| 372 | } tls_ld_got; |
| 373 | |
| 374 | /* Small local sym to section mapping cache. */ |
| 375 | struct sym_sec_cache sym_sec; |
| 376 | }; |
| 377 | |
| 378 | /* Get the x86-64 ELF linker hash table from a link_info structure. */ |
| 379 | |
| 380 | #define elf64_x86_64_hash_table(p) \ |
| 381 | ((struct elf64_x86_64_link_hash_table *) ((p)->hash)) |
| 382 | |
| 383 | /* Create an entry in an x86-64 ELF linker hash table. */ |
| 384 | |
| 385 | static struct bfd_hash_entry * |
| 386 | link_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table, |
| 387 | const char *string) |
| 388 | { |
| 389 | /* Allocate the structure if it has not already been allocated by a |
| 390 | subclass. */ |
| 391 | if (entry == NULL) |
| 392 | { |
| 393 | entry = bfd_hash_allocate (table, |
| 394 | sizeof (struct elf64_x86_64_link_hash_entry)); |
| 395 | if (entry == NULL) |
| 396 | return entry; |
| 397 | } |
| 398 | |
| 399 | /* Call the allocation method of the superclass. */ |
| 400 | entry = _bfd_elf_link_hash_newfunc (entry, table, string); |
| 401 | if (entry != NULL) |
| 402 | { |
| 403 | struct elf64_x86_64_link_hash_entry *eh; |
| 404 | |
| 405 | eh = (struct elf64_x86_64_link_hash_entry *) entry; |
| 406 | eh->dyn_relocs = NULL; |
| 407 | eh->tls_type = GOT_UNKNOWN; |
| 408 | } |
| 409 | |
| 410 | return entry; |
| 411 | } |
| 412 | |
| 413 | /* Create an X86-64 ELF linker hash table. */ |
| 414 | |
| 415 | static struct bfd_link_hash_table * |
| 416 | elf64_x86_64_link_hash_table_create (bfd *abfd) |
| 417 | { |
| 418 | struct elf64_x86_64_link_hash_table *ret; |
| 419 | bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table); |
| 420 | |
| 421 | ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt); |
| 422 | if (ret == NULL) |
| 423 | return NULL; |
| 424 | |
| 425 | if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc)) |
| 426 | { |
| 427 | free (ret); |
| 428 | return NULL; |
| 429 | } |
| 430 | |
| 431 | ret->sgot = NULL; |
| 432 | ret->sgotplt = NULL; |
| 433 | ret->srelgot = NULL; |
| 434 | ret->splt = NULL; |
| 435 | ret->srelplt = NULL; |
| 436 | ret->sdynbss = NULL; |
| 437 | ret->srelbss = NULL; |
| 438 | ret->sym_sec.abfd = NULL; |
| 439 | ret->tls_ld_got.refcount = 0; |
| 440 | |
| 441 | return &ret->elf.root; |
| 442 | } |
| 443 | |
| 444 | /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up |
| 445 | shortcuts to them in our hash table. */ |
| 446 | |
| 447 | static bfd_boolean |
| 448 | create_got_section (bfd *dynobj, struct bfd_link_info *info) |
| 449 | { |
| 450 | struct elf64_x86_64_link_hash_table *htab; |
| 451 | |
| 452 | if (! _bfd_elf_create_got_section (dynobj, info)) |
| 453 | return FALSE; |
| 454 | |
| 455 | htab = elf64_x86_64_hash_table (info); |
| 456 | htab->sgot = bfd_get_section_by_name (dynobj, ".got"); |
| 457 | htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); |
| 458 | if (!htab->sgot || !htab->sgotplt) |
| 459 | abort (); |
| 460 | |
| 461 | htab->srelgot = bfd_make_section (dynobj, ".rela.got"); |
| 462 | if (htab->srelgot == NULL |
| 463 | || ! bfd_set_section_flags (dynobj, htab->srelgot, |
| 464 | (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS |
| 465 | | SEC_IN_MEMORY | SEC_LINKER_CREATED |
| 466 | | SEC_READONLY)) |
| 467 | || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3)) |
| 468 | return FALSE; |
| 469 | return TRUE; |
| 470 | } |
| 471 | |
| 472 | /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and |
| 473 | .rela.bss sections in DYNOBJ, and set up shortcuts to them in our |
| 474 | hash table. */ |
| 475 | |
| 476 | static bfd_boolean |
| 477 | elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) |
| 478 | { |
| 479 | struct elf64_x86_64_link_hash_table *htab; |
| 480 | |
| 481 | htab = elf64_x86_64_hash_table (info); |
| 482 | if (!htab->sgot && !create_got_section (dynobj, info)) |
| 483 | return FALSE; |
| 484 | |
| 485 | if (!_bfd_elf_create_dynamic_sections (dynobj, info)) |
| 486 | return FALSE; |
| 487 | |
| 488 | htab->splt = bfd_get_section_by_name (dynobj, ".plt"); |
| 489 | htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); |
| 490 | htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); |
| 491 | if (!info->shared) |
| 492 | htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); |
| 493 | |
| 494 | if (!htab->splt || !htab->srelplt || !htab->sdynbss |
| 495 | || (!info->shared && !htab->srelbss)) |
| 496 | abort (); |
| 497 | |
| 498 | return TRUE; |
| 499 | } |
| 500 | |
| 501 | /* Copy the extra info we tack onto an elf_link_hash_entry. */ |
| 502 | |
| 503 | static void |
| 504 | elf64_x86_64_copy_indirect_symbol (const struct elf_backend_data *bed, |
| 505 | struct elf_link_hash_entry *dir, |
| 506 | struct elf_link_hash_entry *ind) |
| 507 | { |
| 508 | struct elf64_x86_64_link_hash_entry *edir, *eind; |
| 509 | |
| 510 | edir = (struct elf64_x86_64_link_hash_entry *) dir; |
| 511 | eind = (struct elf64_x86_64_link_hash_entry *) ind; |
| 512 | |
| 513 | if (eind->dyn_relocs != NULL) |
| 514 | { |
| 515 | if (edir->dyn_relocs != NULL) |
| 516 | { |
| 517 | struct elf64_x86_64_dyn_relocs **pp; |
| 518 | struct elf64_x86_64_dyn_relocs *p; |
| 519 | |
| 520 | if (ind->root.type == bfd_link_hash_indirect) |
| 521 | abort (); |
| 522 | |
| 523 | /* Add reloc counts against the weak sym to the strong sym |
| 524 | list. Merge any entries against the same section. */ |
| 525 | for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) |
| 526 | { |
| 527 | struct elf64_x86_64_dyn_relocs *q; |
| 528 | |
| 529 | for (q = edir->dyn_relocs; q != NULL; q = q->next) |
| 530 | if (q->sec == p->sec) |
| 531 | { |
| 532 | q->pc_count += p->pc_count; |
| 533 | q->count += p->count; |
| 534 | *pp = p->next; |
| 535 | break; |
| 536 | } |
| 537 | if (q == NULL) |
| 538 | pp = &p->next; |
| 539 | } |
| 540 | *pp = edir->dyn_relocs; |
| 541 | } |
| 542 | |
| 543 | edir->dyn_relocs = eind->dyn_relocs; |
| 544 | eind->dyn_relocs = NULL; |
| 545 | } |
| 546 | |
| 547 | if (ind->root.type == bfd_link_hash_indirect |
| 548 | && dir->got.refcount <= 0) |
| 549 | { |
| 550 | edir->tls_type = eind->tls_type; |
| 551 | eind->tls_type = GOT_UNKNOWN; |
| 552 | } |
| 553 | |
| 554 | if (ELIMINATE_COPY_RELOCS |
| 555 | && ind->root.type != bfd_link_hash_indirect |
| 556 | && (dir->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0) |
| 557 | /* If called to transfer flags for a weakdef during processing |
| 558 | of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF. |
| 559 | We clear it ourselves for ELIMINATE_COPY_RELOCS. */ |
| 560 | dir->elf_link_hash_flags |= |
| 561 | (ind->elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC |
| 562 | | ELF_LINK_HASH_REF_REGULAR |
| 563 | | ELF_LINK_HASH_REF_REGULAR_NONWEAK)); |
| 564 | else |
| 565 | _bfd_elf_link_hash_copy_indirect (bed, dir, ind); |
| 566 | } |
| 567 | |
| 568 | static bfd_boolean |
| 569 | elf64_x86_64_mkobject (bfd *abfd) |
| 570 | { |
| 571 | bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata); |
| 572 | abfd->tdata.any = bfd_zalloc (abfd, amt); |
| 573 | if (abfd->tdata.any == NULL) |
| 574 | return FALSE; |
| 575 | return TRUE; |
| 576 | } |
| 577 | |
| 578 | static bfd_boolean |
| 579 | elf64_x86_64_elf_object_p (bfd *abfd) |
| 580 | { |
| 581 | /* Allocate our special target data. */ |
| 582 | struct elf64_x86_64_obj_tdata *new_tdata; |
| 583 | bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata); |
| 584 | new_tdata = bfd_zalloc (abfd, amt); |
| 585 | if (new_tdata == NULL) |
| 586 | return FALSE; |
| 587 | new_tdata->root = *abfd->tdata.elf_obj_data; |
| 588 | abfd->tdata.any = new_tdata; |
| 589 | /* Set the right machine number for an x86-64 elf64 file. */ |
| 590 | bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64); |
| 591 | return TRUE; |
| 592 | } |
| 593 | |
| 594 | static int |
| 595 | elf64_x86_64_tls_transition (struct bfd_link_info *info, int r_type, int is_local) |
| 596 | { |
| 597 | if (info->shared) |
| 598 | return r_type; |
| 599 | |
| 600 | switch (r_type) |
| 601 | { |
| 602 | case R_X86_64_TLSGD: |
| 603 | case R_X86_64_GOTTPOFF: |
| 604 | if (is_local) |
| 605 | return R_X86_64_TPOFF32; |
| 606 | return R_X86_64_GOTTPOFF; |
| 607 | case R_X86_64_TLSLD: |
| 608 | return R_X86_64_TPOFF32; |
| 609 | } |
| 610 | |
| 611 | return r_type; |
| 612 | } |
| 613 | |
| 614 | /* Look through the relocs for a section during the first phase, and |
| 615 | calculate needed space in the global offset table, procedure |
| 616 | linkage table, and dynamic reloc sections. */ |
| 617 | |
| 618 | static bfd_boolean |
| 619 | elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, |
| 620 | const Elf_Internal_Rela *relocs) |
| 621 | { |
| 622 | struct elf64_x86_64_link_hash_table *htab; |
| 623 | Elf_Internal_Shdr *symtab_hdr; |
| 624 | struct elf_link_hash_entry **sym_hashes; |
| 625 | const Elf_Internal_Rela *rel; |
| 626 | const Elf_Internal_Rela *rel_end; |
| 627 | asection *sreloc; |
| 628 | |
| 629 | if (info->relocatable) |
| 630 | return TRUE; |
| 631 | |
| 632 | htab = elf64_x86_64_hash_table (info); |
| 633 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 634 | sym_hashes = elf_sym_hashes (abfd); |
| 635 | |
| 636 | sreloc = NULL; |
| 637 | |
| 638 | rel_end = relocs + sec->reloc_count; |
| 639 | for (rel = relocs; rel < rel_end; rel++) |
| 640 | { |
| 641 | unsigned int r_type; |
| 642 | unsigned long r_symndx; |
| 643 | struct elf_link_hash_entry *h; |
| 644 | |
| 645 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 646 | r_type = ELF64_R_TYPE (rel->r_info); |
| 647 | |
| 648 | if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) |
| 649 | { |
| 650 | (*_bfd_error_handler) (_("%s: bad symbol index: %d"), |
| 651 | bfd_archive_filename (abfd), |
| 652 | r_symndx); |
| 653 | return FALSE; |
| 654 | } |
| 655 | |
| 656 | if (r_symndx < symtab_hdr->sh_info) |
| 657 | h = NULL; |
| 658 | else |
| 659 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 660 | |
| 661 | r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL); |
| 662 | switch (r_type) |
| 663 | { |
| 664 | case R_X86_64_TLSLD: |
| 665 | htab->tls_ld_got.refcount += 1; |
| 666 | goto create_got; |
| 667 | |
| 668 | case R_X86_64_TPOFF32: |
| 669 | if (info->shared) |
| 670 | { |
| 671 | (*_bfd_error_handler) |
| 672 | (_("%s: relocation %s can not be used when making a shared object; recompile with -fPIC"), |
| 673 | bfd_archive_filename (abfd), |
| 674 | x86_64_elf_howto_table[r_type].name); |
| 675 | bfd_set_error (bfd_error_bad_value); |
| 676 | return FALSE; |
| 677 | } |
| 678 | break; |
| 679 | |
| 680 | case R_X86_64_GOTTPOFF: |
| 681 | if (info->shared) |
| 682 | info->flags |= DF_STATIC_TLS; |
| 683 | /* Fall through */ |
| 684 | |
| 685 | case R_X86_64_GOT32: |
| 686 | case R_X86_64_GOTPCREL: |
| 687 | case R_X86_64_TLSGD: |
| 688 | /* This symbol requires a global offset table entry. */ |
| 689 | { |
| 690 | int tls_type, old_tls_type; |
| 691 | |
| 692 | switch (r_type) |
| 693 | { |
| 694 | default: tls_type = GOT_NORMAL; break; |
| 695 | case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break; |
| 696 | case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break; |
| 697 | } |
| 698 | |
| 699 | if (h != NULL) |
| 700 | { |
| 701 | h->got.refcount += 1; |
| 702 | old_tls_type = elf64_x86_64_hash_entry (h)->tls_type; |
| 703 | } |
| 704 | else |
| 705 | { |
| 706 | bfd_signed_vma *local_got_refcounts; |
| 707 | |
| 708 | /* This is a global offset table entry for a local symbol. */ |
| 709 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 710 | if (local_got_refcounts == NULL) |
| 711 | { |
| 712 | bfd_size_type size; |
| 713 | |
| 714 | size = symtab_hdr->sh_info; |
| 715 | size *= sizeof (bfd_signed_vma) + sizeof (char); |
| 716 | local_got_refcounts = ((bfd_signed_vma *) |
| 717 | bfd_zalloc (abfd, size)); |
| 718 | if (local_got_refcounts == NULL) |
| 719 | return FALSE; |
| 720 | elf_local_got_refcounts (abfd) = local_got_refcounts; |
| 721 | elf64_x86_64_local_got_tls_type (abfd) |
| 722 | = (char *) (local_got_refcounts + symtab_hdr->sh_info); |
| 723 | } |
| 724 | local_got_refcounts[r_symndx] += 1; |
| 725 | old_tls_type |
| 726 | = elf64_x86_64_local_got_tls_type (abfd) [r_symndx]; |
| 727 | } |
| 728 | |
| 729 | /* If a TLS symbol is accessed using IE at least once, |
| 730 | there is no point to use dynamic model for it. */ |
| 731 | if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN |
| 732 | && (old_tls_type != GOT_TLS_GD || tls_type != GOT_TLS_IE)) |
| 733 | { |
| 734 | if (old_tls_type == GOT_TLS_IE && tls_type == GOT_TLS_GD) |
| 735 | tls_type = old_tls_type; |
| 736 | else |
| 737 | { |
| 738 | (*_bfd_error_handler) |
| 739 | (_("%s: %s' accessed both as normal and thread local symbol"), |
| 740 | bfd_archive_filename (abfd), |
| 741 | h ? h->root.root.string : "<local>"); |
| 742 | return FALSE; |
| 743 | } |
| 744 | } |
| 745 | |
| 746 | if (old_tls_type != tls_type) |
| 747 | { |
| 748 | if (h != NULL) |
| 749 | elf64_x86_64_hash_entry (h)->tls_type = tls_type; |
| 750 | else |
| 751 | elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type; |
| 752 | } |
| 753 | } |
| 754 | /* Fall through */ |
| 755 | |
| 756 | //case R_X86_64_GOTPCREL: |
| 757 | create_got: |
| 758 | if (htab->sgot == NULL) |
| 759 | { |
| 760 | if (htab->elf.dynobj == NULL) |
| 761 | htab->elf.dynobj = abfd; |
| 762 | if (!create_got_section (htab->elf.dynobj, info)) |
| 763 | return FALSE; |
| 764 | } |
| 765 | break; |
| 766 | |
| 767 | case R_X86_64_PLT32: |
| 768 | /* This symbol requires a procedure linkage table entry. We |
| 769 | actually build the entry in adjust_dynamic_symbol, |
| 770 | because this might be a case of linking PIC code which is |
| 771 | never referenced by a dynamic object, in which case we |
| 772 | don't need to generate a procedure linkage table entry |
| 773 | after all. */ |
| 774 | |
| 775 | /* If this is a local symbol, we resolve it directly without |
| 776 | creating a procedure linkage table entry. */ |
| 777 | if (h == NULL) |
| 778 | continue; |
| 779 | |
| 780 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; |
| 781 | h->plt.refcount += 1; |
| 782 | break; |
| 783 | |
| 784 | case R_X86_64_8: |
| 785 | case R_X86_64_16: |
| 786 | case R_X86_64_32: |
| 787 | case R_X86_64_32S: |
| 788 | /* Let's help debug shared library creation. These relocs |
| 789 | cannot be used in shared libs. Don't error out for |
| 790 | sections we don't care about, such as debug sections or |
| 791 | non-constant sections. */ |
| 792 | if (info->shared |
| 793 | && (sec->flags & SEC_ALLOC) != 0 |
| 794 | && (sec->flags & SEC_READONLY) != 0) |
| 795 | { |
| 796 | (*_bfd_error_handler) |
| 797 | (_("%s: relocation %s can not be used when making a shared object; recompile with -fPIC"), |
| 798 | bfd_archive_filename (abfd), |
| 799 | x86_64_elf_howto_table[r_type].name); |
| 800 | bfd_set_error (bfd_error_bad_value); |
| 801 | return FALSE; |
| 802 | } |
| 803 | /* Fall through. */ |
| 804 | |
| 805 | case R_X86_64_PC8: |
| 806 | case R_X86_64_PC16: |
| 807 | case R_X86_64_PC32: |
| 808 | case R_X86_64_64: |
| 809 | if (h != NULL && !info->shared) |
| 810 | { |
| 811 | /* If this reloc is in a read-only section, we might |
| 812 | need a copy reloc. We can't check reliably at this |
| 813 | stage whether the section is read-only, as input |
| 814 | sections have not yet been mapped to output sections. |
| 815 | Tentatively set the flag for now, and correct in |
| 816 | adjust_dynamic_symbol. */ |
| 817 | h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; |
| 818 | |
| 819 | /* We may need a .plt entry if the function this reloc |
| 820 | refers to is in a shared lib. */ |
| 821 | h->plt.refcount += 1; |
| 822 | } |
| 823 | |
| 824 | /* If we are creating a shared library, and this is a reloc |
| 825 | against a global symbol, or a non PC relative reloc |
| 826 | against a local symbol, then we need to copy the reloc |
| 827 | into the shared library. However, if we are linking with |
| 828 | -Bsymbolic, we do not need to copy a reloc against a |
| 829 | global symbol which is defined in an object we are |
| 830 | including in the link (i.e., DEF_REGULAR is set). At |
| 831 | this point we have not seen all the input files, so it is |
| 832 | possible that DEF_REGULAR is not set now but will be set |
| 833 | later (it is never cleared). In case of a weak definition, |
| 834 | DEF_REGULAR may be cleared later by a strong definition in |
| 835 | a shared library. We account for that possibility below by |
| 836 | storing information in the relocs_copied field of the hash |
| 837 | table entry. A similar situation occurs when creating |
| 838 | shared libraries and symbol visibility changes render the |
| 839 | symbol local. |
| 840 | |
| 841 | If on the other hand, we are creating an executable, we |
| 842 | may need to keep relocations for symbols satisfied by a |
| 843 | dynamic library if we manage to avoid copy relocs for the |
| 844 | symbol. */ |
| 845 | if ((info->shared |
| 846 | && (sec->flags & SEC_ALLOC) != 0 |
| 847 | && (((r_type != R_X86_64_PC8) |
| 848 | && (r_type != R_X86_64_PC16) |
| 849 | && (r_type != R_X86_64_PC32)) |
| 850 | || (h != NULL |
| 851 | && (! info->symbolic |
| 852 | || h->root.type == bfd_link_hash_defweak |
| 853 | || (h->elf_link_hash_flags |
| 854 | & ELF_LINK_HASH_DEF_REGULAR) == 0)))) |
| 855 | || (ELIMINATE_COPY_RELOCS |
| 856 | && !info->shared |
| 857 | && (sec->flags & SEC_ALLOC) != 0 |
| 858 | && h != NULL |
| 859 | && (h->root.type == bfd_link_hash_defweak |
| 860 | || (h->elf_link_hash_flags |
| 861 | & ELF_LINK_HASH_DEF_REGULAR) == 0))) |
| 862 | { |
| 863 | struct elf64_x86_64_dyn_relocs *p; |
| 864 | struct elf64_x86_64_dyn_relocs **head; |
| 865 | |
| 866 | /* We must copy these reloc types into the output file. |
| 867 | Create a reloc section in dynobj and make room for |
| 868 | this reloc. */ |
| 869 | if (sreloc == NULL) |
| 870 | { |
| 871 | const char *name; |
| 872 | bfd *dynobj; |
| 873 | |
| 874 | name = (bfd_elf_string_from_elf_section |
| 875 | (abfd, |
| 876 | elf_elfheader (abfd)->e_shstrndx, |
| 877 | elf_section_data (sec)->rel_hdr.sh_name)); |
| 878 | if (name == NULL) |
| 879 | return FALSE; |
| 880 | |
| 881 | if (strncmp (name, ".rela", 5) != 0 |
| 882 | || strcmp (bfd_get_section_name (abfd, sec), |
| 883 | name + 5) != 0) |
| 884 | { |
| 885 | (*_bfd_error_handler) |
| 886 | (_("%s: bad relocation section name `%s\'"), |
| 887 | bfd_archive_filename (abfd), name); |
| 888 | } |
| 889 | |
| 890 | if (htab->elf.dynobj == NULL) |
| 891 | htab->elf.dynobj = abfd; |
| 892 | |
| 893 | dynobj = htab->elf.dynobj; |
| 894 | |
| 895 | sreloc = bfd_get_section_by_name (dynobj, name); |
| 896 | if (sreloc == NULL) |
| 897 | { |
| 898 | flagword flags; |
| 899 | |
| 900 | sreloc = bfd_make_section (dynobj, name); |
| 901 | flags = (SEC_HAS_CONTENTS | SEC_READONLY |
| 902 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); |
| 903 | if ((sec->flags & SEC_ALLOC) != 0) |
| 904 | flags |= SEC_ALLOC | SEC_LOAD; |
| 905 | if (sreloc == NULL |
| 906 | || ! bfd_set_section_flags (dynobj, sreloc, flags) |
| 907 | || ! bfd_set_section_alignment (dynobj, sreloc, 3)) |
| 908 | return FALSE; |
| 909 | } |
| 910 | elf_section_data (sec)->sreloc = sreloc; |
| 911 | } |
| 912 | |
| 913 | /* If this is a global symbol, we count the number of |
| 914 | relocations we need for this symbol. */ |
| 915 | if (h != NULL) |
| 916 | { |
| 917 | head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs; |
| 918 | } |
| 919 | else |
| 920 | { |
| 921 | /* Track dynamic relocs needed for local syms too. |
| 922 | We really need local syms available to do this |
| 923 | easily. Oh well. */ |
| 924 | |
| 925 | asection *s; |
| 926 | s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, |
| 927 | sec, r_symndx); |
| 928 | if (s == NULL) |
| 929 | return FALSE; |
| 930 | |
| 931 | head = ((struct elf64_x86_64_dyn_relocs **) |
| 932 | &elf_section_data (s)->local_dynrel); |
| 933 | } |
| 934 | |
| 935 | p = *head; |
| 936 | if (p == NULL || p->sec != sec) |
| 937 | { |
| 938 | bfd_size_type amt = sizeof *p; |
| 939 | p = ((struct elf64_x86_64_dyn_relocs *) |
| 940 | bfd_alloc (htab->elf.dynobj, amt)); |
| 941 | if (p == NULL) |
| 942 | return FALSE; |
| 943 | p->next = *head; |
| 944 | *head = p; |
| 945 | p->sec = sec; |
| 946 | p->count = 0; |
| 947 | p->pc_count = 0; |
| 948 | } |
| 949 | |
| 950 | p->count += 1; |
| 951 | if (r_type == R_X86_64_PC8 |
| 952 | || r_type == R_X86_64_PC16 |
| 953 | || r_type == R_X86_64_PC32) |
| 954 | p->pc_count += 1; |
| 955 | } |
| 956 | break; |
| 957 | |
| 958 | /* This relocation describes the C++ object vtable hierarchy. |
| 959 | Reconstruct it for later use during GC. */ |
| 960 | case R_X86_64_GNU_VTINHERIT: |
| 961 | if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
| 962 | return FALSE; |
| 963 | break; |
| 964 | |
| 965 | /* This relocation describes which C++ vtable entries are actually |
| 966 | used. Record for later use during GC. */ |
| 967 | case R_X86_64_GNU_VTENTRY: |
| 968 | if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
| 969 | return FALSE; |
| 970 | break; |
| 971 | |
| 972 | default: |
| 973 | break; |
| 974 | } |
| 975 | } |
| 976 | |
| 977 | return TRUE; |
| 978 | } |
| 979 | |
| 980 | /* Return the section that should be marked against GC for a given |
| 981 | relocation. */ |
| 982 | |
| 983 | static asection * |
| 984 | elf64_x86_64_gc_mark_hook (asection *sec, |
| 985 | struct bfd_link_info *info ATTRIBUTE_UNUSED, |
| 986 | Elf_Internal_Rela *rel, |
| 987 | struct elf_link_hash_entry *h, |
| 988 | Elf_Internal_Sym *sym) |
| 989 | { |
| 990 | if (h != NULL) |
| 991 | { |
| 992 | switch (ELF64_R_TYPE (rel->r_info)) |
| 993 | { |
| 994 | case R_X86_64_GNU_VTINHERIT: |
| 995 | case R_X86_64_GNU_VTENTRY: |
| 996 | break; |
| 997 | |
| 998 | default: |
| 999 | switch (h->root.type) |
| 1000 | { |
| 1001 | case bfd_link_hash_defined: |
| 1002 | case bfd_link_hash_defweak: |
| 1003 | return h->root.u.def.section; |
| 1004 | |
| 1005 | case bfd_link_hash_common: |
| 1006 | return h->root.u.c.p->section; |
| 1007 | |
| 1008 | default: |
| 1009 | break; |
| 1010 | } |
| 1011 | } |
| 1012 | } |
| 1013 | else |
| 1014 | return bfd_section_from_elf_index (sec->owner, sym->st_shndx); |
| 1015 | |
| 1016 | return NULL; |
| 1017 | } |
| 1018 | |
| 1019 | /* Update the got entry reference counts for the section being removed. */ |
| 1020 | |
| 1021 | static bfd_boolean |
| 1022 | elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, |
| 1023 | asection *sec, const Elf_Internal_Rela *relocs) |
| 1024 | { |
| 1025 | Elf_Internal_Shdr *symtab_hdr; |
| 1026 | struct elf_link_hash_entry **sym_hashes; |
| 1027 | bfd_signed_vma *local_got_refcounts; |
| 1028 | const Elf_Internal_Rela *rel, *relend; |
| 1029 | |
| 1030 | elf_section_data (sec)->local_dynrel = NULL; |
| 1031 | |
| 1032 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| 1033 | sym_hashes = elf_sym_hashes (abfd); |
| 1034 | local_got_refcounts = elf_local_got_refcounts (abfd); |
| 1035 | |
| 1036 | relend = relocs + sec->reloc_count; |
| 1037 | for (rel = relocs; rel < relend; rel++) |
| 1038 | { |
| 1039 | unsigned long r_symndx; |
| 1040 | unsigned int r_type; |
| 1041 | struct elf_link_hash_entry *h = NULL; |
| 1042 | |
| 1043 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 1044 | if (r_symndx >= symtab_hdr->sh_info) |
| 1045 | { |
| 1046 | struct elf64_x86_64_link_hash_entry *eh; |
| 1047 | struct elf64_x86_64_dyn_relocs **pp; |
| 1048 | struct elf64_x86_64_dyn_relocs *p; |
| 1049 | |
| 1050 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
| 1051 | eh = (struct elf64_x86_64_link_hash_entry *) h; |
| 1052 | |
| 1053 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) |
| 1054 | if (p->sec == sec) |
| 1055 | { |
| 1056 | /* Everything must go for SEC. */ |
| 1057 | *pp = p->next; |
| 1058 | break; |
| 1059 | } |
| 1060 | } |
| 1061 | |
| 1062 | r_type = ELF64_R_TYPE (rel->r_info); |
| 1063 | r_type = elf64_x86_64_tls_transition (info, r_type, h != NULL); |
| 1064 | switch (r_type) |
| 1065 | { |
| 1066 | case R_X86_64_TLSLD: |
| 1067 | if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0) |
| 1068 | elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1; |
| 1069 | break; |
| 1070 | |
| 1071 | case R_X86_64_TLSGD: |
| 1072 | case R_X86_64_GOTTPOFF: |
| 1073 | case R_X86_64_GOT32: |
| 1074 | case R_X86_64_GOTPCREL: |
| 1075 | if (h != NULL) |
| 1076 | { |
| 1077 | if (h->got.refcount > 0) |
| 1078 | h->got.refcount -= 1; |
| 1079 | } |
| 1080 | else if (local_got_refcounts != NULL) |
| 1081 | { |
| 1082 | if (local_got_refcounts[r_symndx] > 0) |
| 1083 | local_got_refcounts[r_symndx] -= 1; |
| 1084 | } |
| 1085 | break; |
| 1086 | |
| 1087 | case R_X86_64_8: |
| 1088 | case R_X86_64_16: |
| 1089 | case R_X86_64_32: |
| 1090 | case R_X86_64_64: |
| 1091 | case R_X86_64_32S: |
| 1092 | case R_X86_64_PC8: |
| 1093 | case R_X86_64_PC16: |
| 1094 | case R_X86_64_PC32: |
| 1095 | if (info->shared) |
| 1096 | break; |
| 1097 | /* Fall thru */ |
| 1098 | |
| 1099 | case R_X86_64_PLT32: |
| 1100 | if (h != NULL) |
| 1101 | { |
| 1102 | if (h->plt.refcount > 0) |
| 1103 | h->plt.refcount -= 1; |
| 1104 | } |
| 1105 | break; |
| 1106 | |
| 1107 | default: |
| 1108 | break; |
| 1109 | } |
| 1110 | } |
| 1111 | |
| 1112 | return TRUE; |
| 1113 | } |
| 1114 | |
| 1115 | /* Adjust a symbol defined by a dynamic object and referenced by a |
| 1116 | regular object. The current definition is in some section of the |
| 1117 | dynamic object, but we're not including those sections. We have to |
| 1118 | change the definition to something the rest of the link can |
| 1119 | understand. */ |
| 1120 | |
| 1121 | static bfd_boolean |
| 1122 | elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info, |
| 1123 | struct elf_link_hash_entry *h) |
| 1124 | { |
| 1125 | struct elf64_x86_64_link_hash_table *htab; |
| 1126 | asection *s; |
| 1127 | unsigned int power_of_two; |
| 1128 | |
| 1129 | /* If this is a function, put it in the procedure linkage table. We |
| 1130 | will fill in the contents of the procedure linkage table later, |
| 1131 | when we know the address of the .got section. */ |
| 1132 | if (h->type == STT_FUNC |
| 1133 | || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) |
| 1134 | { |
| 1135 | if (h->plt.refcount <= 0 |
| 1136 | || SYMBOL_CALLS_LOCAL (info, h) |
| 1137 | || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 1138 | && h->root.type == bfd_link_hash_undefweak)) |
| 1139 | { |
| 1140 | /* This case can occur if we saw a PLT32 reloc in an input |
| 1141 | file, but the symbol was never referred to by a dynamic |
| 1142 | object, or if all references were garbage collected. In |
| 1143 | such a case, we don't actually need to build a procedure |
| 1144 | linkage table, and we can just do a PC32 reloc instead. */ |
| 1145 | h->plt.offset = (bfd_vma) -1; |
| 1146 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1147 | } |
| 1148 | |
| 1149 | return TRUE; |
| 1150 | } |
| 1151 | else |
| 1152 | /* It's possible that we incorrectly decided a .plt reloc was |
| 1153 | needed for an R_X86_64_PC32 reloc to a non-function sym in |
| 1154 | check_relocs. We can't decide accurately between function and |
| 1155 | non-function syms in check-relocs; Objects loaded later in |
| 1156 | the link may change h->type. So fix it now. */ |
| 1157 | h->plt.offset = (bfd_vma) -1; |
| 1158 | |
| 1159 | /* If this is a weak symbol, and there is a real definition, the |
| 1160 | processor independent code will have arranged for us to see the |
| 1161 | real definition first, and we can just use the same value. */ |
| 1162 | if (h->weakdef != NULL) |
| 1163 | { |
| 1164 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined |
| 1165 | || h->weakdef->root.type == bfd_link_hash_defweak); |
| 1166 | h->root.u.def.section = h->weakdef->root.u.def.section; |
| 1167 | h->root.u.def.value = h->weakdef->root.u.def.value; |
| 1168 | if (ELIMINATE_COPY_RELOCS || info->nocopyreloc) |
| 1169 | h->elf_link_hash_flags |
| 1170 | = ((h->elf_link_hash_flags & ~ELF_LINK_NON_GOT_REF) |
| 1171 | | (h->weakdef->elf_link_hash_flags & ELF_LINK_NON_GOT_REF)); |
| 1172 | return TRUE; |
| 1173 | } |
| 1174 | |
| 1175 | /* This is a reference to a symbol defined by a dynamic object which |
| 1176 | is not a function. */ |
| 1177 | |
| 1178 | /* If we are creating a shared library, we must presume that the |
| 1179 | only references to the symbol are via the global offset table. |
| 1180 | For such cases we need not do anything here; the relocations will |
| 1181 | be handled correctly by relocate_section. */ |
| 1182 | if (info->shared) |
| 1183 | return TRUE; |
| 1184 | |
| 1185 | /* If there are no references to this symbol that do not use the |
| 1186 | GOT, we don't need to generate a copy reloc. */ |
| 1187 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) |
| 1188 | return TRUE; |
| 1189 | |
| 1190 | /* If -z nocopyreloc was given, we won't generate them either. */ |
| 1191 | if (info->nocopyreloc) |
| 1192 | { |
| 1193 | h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; |
| 1194 | return TRUE; |
| 1195 | } |
| 1196 | |
| 1197 | if (ELIMINATE_COPY_RELOCS) |
| 1198 | { |
| 1199 | struct elf64_x86_64_link_hash_entry * eh; |
| 1200 | struct elf64_x86_64_dyn_relocs *p; |
| 1201 | |
| 1202 | eh = (struct elf64_x86_64_link_hash_entry *) h; |
| 1203 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1204 | { |
| 1205 | s = p->sec->output_section; |
| 1206 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1207 | break; |
| 1208 | } |
| 1209 | |
| 1210 | /* If we didn't find any dynamic relocs in read-only sections, then |
| 1211 | we'll be keeping the dynamic relocs and avoiding the copy reloc. */ |
| 1212 | if (p == NULL) |
| 1213 | { |
| 1214 | h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; |
| 1215 | return TRUE; |
| 1216 | } |
| 1217 | } |
| 1218 | |
| 1219 | /* We must allocate the symbol in our .dynbss section, which will |
| 1220 | become part of the .bss section of the executable. There will be |
| 1221 | an entry for this symbol in the .dynsym section. The dynamic |
| 1222 | object will contain position independent code, so all references |
| 1223 | from the dynamic object to this symbol will go through the global |
| 1224 | offset table. The dynamic linker will use the .dynsym entry to |
| 1225 | determine the address it must put in the global offset table, so |
| 1226 | both the dynamic object and the regular object will refer to the |
| 1227 | same memory location for the variable. */ |
| 1228 | |
| 1229 | htab = elf64_x86_64_hash_table (info); |
| 1230 | |
| 1231 | /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker |
| 1232 | to copy the initial value out of the dynamic object and into the |
| 1233 | runtime process image. */ |
| 1234 | if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) |
| 1235 | { |
| 1236 | htab->srelbss->_raw_size += sizeof (Elf64_External_Rela); |
| 1237 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; |
| 1238 | } |
| 1239 | |
| 1240 | /* We need to figure out the alignment required for this symbol. I |
| 1241 | have no idea how ELF linkers handle this. 16-bytes is the size |
| 1242 | of the largest type that requires hard alignment -- long double. */ |
| 1243 | /* FIXME: This is VERY ugly. Should be fixed for all architectures using |
| 1244 | this construct. */ |
| 1245 | power_of_two = bfd_log2 (h->size); |
| 1246 | if (power_of_two > 4) |
| 1247 | power_of_two = 4; |
| 1248 | |
| 1249 | /* Apply the required alignment. */ |
| 1250 | s = htab->sdynbss; |
| 1251 | s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two)); |
| 1252 | if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) |
| 1253 | { |
| 1254 | if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) |
| 1255 | return FALSE; |
| 1256 | } |
| 1257 | |
| 1258 | /* Define the symbol as being at this point in the section. */ |
| 1259 | h->root.u.def.section = s; |
| 1260 | h->root.u.def.value = s->_raw_size; |
| 1261 | |
| 1262 | /* Increment the section size to make room for the symbol. */ |
| 1263 | s->_raw_size += h->size; |
| 1264 | |
| 1265 | return TRUE; |
| 1266 | } |
| 1267 | |
| 1268 | /* This is the condition under which elf64_x86_64_finish_dynamic_symbol |
| 1269 | will be called from elflink.h. If elflink.h doesn't call our |
| 1270 | finish_dynamic_symbol routine, we'll need to do something about |
| 1271 | initializing any .plt and .got entries in elf64_x86_64_relocate_section. */ |
| 1272 | #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \ |
| 1273 | ((DYN) \ |
| 1274 | && ((SHARED) \ |
| 1275 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ |
| 1276 | && ((H)->dynindx != -1 \ |
| 1277 | || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) |
| 1278 | |
| 1279 | /* Allocate space in .plt, .got and associated reloc sections for |
| 1280 | dynamic relocs. */ |
| 1281 | |
| 1282 | static bfd_boolean |
| 1283 | allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) |
| 1284 | { |
| 1285 | struct bfd_link_info *info; |
| 1286 | struct elf64_x86_64_link_hash_table *htab; |
| 1287 | struct elf64_x86_64_link_hash_entry *eh; |
| 1288 | struct elf64_x86_64_dyn_relocs *p; |
| 1289 | |
| 1290 | if (h->root.type == bfd_link_hash_indirect) |
| 1291 | return TRUE; |
| 1292 | |
| 1293 | if (h->root.type == bfd_link_hash_warning) |
| 1294 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1295 | |
| 1296 | info = (struct bfd_link_info *) inf; |
| 1297 | htab = elf64_x86_64_hash_table (info); |
| 1298 | |
| 1299 | if (htab->elf.dynamic_sections_created |
| 1300 | && h->plt.refcount > 0) |
| 1301 | { |
| 1302 | /* Make sure this symbol is output as a dynamic symbol. |
| 1303 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1304 | if (h->dynindx == -1 |
| 1305 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1306 | { |
| 1307 | if (! bfd_elf64_link_record_dynamic_symbol (info, h)) |
| 1308 | return FALSE; |
| 1309 | } |
| 1310 | |
| 1311 | if (info->shared |
| 1312 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) |
| 1313 | { |
| 1314 | asection *s = htab->splt; |
| 1315 | |
| 1316 | /* If this is the first .plt entry, make room for the special |
| 1317 | first entry. */ |
| 1318 | if (s->_raw_size == 0) |
| 1319 | s->_raw_size += PLT_ENTRY_SIZE; |
| 1320 | |
| 1321 | h->plt.offset = s->_raw_size; |
| 1322 | |
| 1323 | /* If this symbol is not defined in a regular file, and we are |
| 1324 | not generating a shared library, then set the symbol to this |
| 1325 | location in the .plt. This is required to make function |
| 1326 | pointers compare as equal between the normal executable and |
| 1327 | the shared library. */ |
| 1328 | if (! info->shared |
| 1329 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1330 | { |
| 1331 | h->root.u.def.section = s; |
| 1332 | h->root.u.def.value = h->plt.offset; |
| 1333 | } |
| 1334 | |
| 1335 | /* Make room for this entry. */ |
| 1336 | s->_raw_size += PLT_ENTRY_SIZE; |
| 1337 | |
| 1338 | /* We also need to make an entry in the .got.plt section, which |
| 1339 | will be placed in the .got section by the linker script. */ |
| 1340 | htab->sgotplt->_raw_size += GOT_ENTRY_SIZE; |
| 1341 | |
| 1342 | /* We also need to make an entry in the .rela.plt section. */ |
| 1343 | htab->srelplt->_raw_size += sizeof (Elf64_External_Rela); |
| 1344 | } |
| 1345 | else |
| 1346 | { |
| 1347 | h->plt.offset = (bfd_vma) -1; |
| 1348 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1349 | } |
| 1350 | } |
| 1351 | else |
| 1352 | { |
| 1353 | h->plt.offset = (bfd_vma) -1; |
| 1354 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; |
| 1355 | } |
| 1356 | |
| 1357 | /* If R_X86_64_GOTTPOFF symbol is now local to the binary, |
| 1358 | make it a R_X86_64_TPOFF32 requiring no GOT entry. */ |
| 1359 | if (h->got.refcount > 0 |
| 1360 | && !info->shared |
| 1361 | && h->dynindx == -1 |
| 1362 | && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE) |
| 1363 | h->got.offset = (bfd_vma) -1; |
| 1364 | else if (h->got.refcount > 0) |
| 1365 | { |
| 1366 | asection *s; |
| 1367 | bfd_boolean dyn; |
| 1368 | int tls_type = elf64_x86_64_hash_entry (h)->tls_type; |
| 1369 | |
| 1370 | /* Make sure this symbol is output as a dynamic symbol. |
| 1371 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1372 | if (h->dynindx == -1 |
| 1373 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1374 | { |
| 1375 | if (! bfd_elf64_link_record_dynamic_symbol (info, h)) |
| 1376 | return FALSE; |
| 1377 | } |
| 1378 | |
| 1379 | s = htab->sgot; |
| 1380 | h->got.offset = s->_raw_size; |
| 1381 | s->_raw_size += GOT_ENTRY_SIZE; |
| 1382 | /* R_X86_64_TLSGD needs 2 consecutive GOT slots. */ |
| 1383 | if (tls_type == GOT_TLS_GD) |
| 1384 | s->_raw_size += GOT_ENTRY_SIZE; |
| 1385 | dyn = htab->elf.dynamic_sections_created; |
| 1386 | /* R_X86_64_TLSGD needs one dynamic relocation if local symbol |
| 1387 | and two if global. |
| 1388 | R_X86_64_GOTTPOFF needs one dynamic relocation. */ |
| 1389 | if ((tls_type == GOT_TLS_GD && h->dynindx == -1) |
| 1390 | || tls_type == GOT_TLS_IE) |
| 1391 | htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); |
| 1392 | else if (tls_type == GOT_TLS_GD) |
| 1393 | htab->srelgot->_raw_size += 2 * sizeof (Elf64_External_Rela); |
| 1394 | else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 1395 | || h->root.type != bfd_link_hash_undefweak) |
| 1396 | && (info->shared |
| 1397 | || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) |
| 1398 | htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); |
| 1399 | } |
| 1400 | else |
| 1401 | h->got.offset = (bfd_vma) -1; |
| 1402 | |
| 1403 | eh = (struct elf64_x86_64_link_hash_entry *) h; |
| 1404 | if (eh->dyn_relocs == NULL) |
| 1405 | return TRUE; |
| 1406 | |
| 1407 | /* In the shared -Bsymbolic case, discard space allocated for |
| 1408 | dynamic pc-relative relocs against symbols which turn out to be |
| 1409 | defined in regular objects. For the normal shared case, discard |
| 1410 | space for pc-relative relocs that have become local due to symbol |
| 1411 | visibility changes. */ |
| 1412 | |
| 1413 | if (info->shared) |
| 1414 | { |
| 1415 | /* Relocs that use pc_count are those that appear on a call |
| 1416 | insn, or certain REL relocs that can generated via assembly. |
| 1417 | We want calls to protected symbols to resolve directly to the |
| 1418 | function rather than going via the plt. If people want |
| 1419 | function pointer comparisons to work as expected then they |
| 1420 | should avoid writing weird assembly. */ |
| 1421 | if (SYMBOL_CALLS_LOCAL (info, h)) |
| 1422 | { |
| 1423 | struct elf64_x86_64_dyn_relocs **pp; |
| 1424 | |
| 1425 | for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) |
| 1426 | { |
| 1427 | p->count -= p->pc_count; |
| 1428 | p->pc_count = 0; |
| 1429 | if (p->count == 0) |
| 1430 | *pp = p->next; |
| 1431 | else |
| 1432 | pp = &p->next; |
| 1433 | } |
| 1434 | } |
| 1435 | |
| 1436 | /* Also discard relocs on undefined weak syms with non-default |
| 1437 | visibility. */ |
| 1438 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
| 1439 | && h->root.type == bfd_link_hash_undefweak) |
| 1440 | eh->dyn_relocs = NULL; |
| 1441 | } |
| 1442 | else if (ELIMINATE_COPY_RELOCS) |
| 1443 | { |
| 1444 | /* For the non-shared case, discard space for relocs against |
| 1445 | symbols which turn out to need copy relocs or are not |
| 1446 | dynamic. */ |
| 1447 | |
| 1448 | if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 1449 | && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 1450 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1451 | || (htab->elf.dynamic_sections_created |
| 1452 | && (h->root.type == bfd_link_hash_undefweak |
| 1453 | || h->root.type == bfd_link_hash_undefined)))) |
| 1454 | { |
| 1455 | /* Make sure this symbol is output as a dynamic symbol. |
| 1456 | Undefined weak syms won't yet be marked as dynamic. */ |
| 1457 | if (h->dynindx == -1 |
| 1458 | && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) |
| 1459 | { |
| 1460 | if (! bfd_elf64_link_record_dynamic_symbol (info, h)) |
| 1461 | return FALSE; |
| 1462 | } |
| 1463 | |
| 1464 | /* If that succeeded, we know we'll be keeping all the |
| 1465 | relocs. */ |
| 1466 | if (h->dynindx != -1) |
| 1467 | goto keep; |
| 1468 | } |
| 1469 | |
| 1470 | eh->dyn_relocs = NULL; |
| 1471 | |
| 1472 | keep: ; |
| 1473 | } |
| 1474 | |
| 1475 | /* Finally, allocate space. */ |
| 1476 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1477 | { |
| 1478 | asection *sreloc = elf_section_data (p->sec)->sreloc; |
| 1479 | sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela); |
| 1480 | } |
| 1481 | |
| 1482 | return TRUE; |
| 1483 | } |
| 1484 | |
| 1485 | /* Find any dynamic relocs that apply to read-only sections. */ |
| 1486 | |
| 1487 | static bfd_boolean |
| 1488 | readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf) |
| 1489 | { |
| 1490 | struct elf64_x86_64_link_hash_entry *eh; |
| 1491 | struct elf64_x86_64_dyn_relocs *p; |
| 1492 | |
| 1493 | if (h->root.type == bfd_link_hash_warning) |
| 1494 | h = (struct elf_link_hash_entry *) h->root.u.i.link; |
| 1495 | |
| 1496 | eh = (struct elf64_x86_64_link_hash_entry *) h; |
| 1497 | for (p = eh->dyn_relocs; p != NULL; p = p->next) |
| 1498 | { |
| 1499 | asection *s = p->sec->output_section; |
| 1500 | |
| 1501 | if (s != NULL && (s->flags & SEC_READONLY) != 0) |
| 1502 | { |
| 1503 | struct bfd_link_info *info = (struct bfd_link_info *) inf; |
| 1504 | |
| 1505 | info->flags |= DF_TEXTREL; |
| 1506 | |
| 1507 | /* Not an error, just cut short the traversal. */ |
| 1508 | return FALSE; |
| 1509 | } |
| 1510 | } |
| 1511 | return TRUE; |
| 1512 | } |
| 1513 | |
| 1514 | /* Set the sizes of the dynamic sections. */ |
| 1515 | |
| 1516 | static bfd_boolean |
| 1517 | elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, |
| 1518 | struct bfd_link_info *info) |
| 1519 | { |
| 1520 | struct elf64_x86_64_link_hash_table *htab; |
| 1521 | bfd *dynobj; |
| 1522 | asection *s; |
| 1523 | bfd_boolean relocs; |
| 1524 | bfd *ibfd; |
| 1525 | |
| 1526 | htab = elf64_x86_64_hash_table (info); |
| 1527 | dynobj = htab->elf.dynobj; |
| 1528 | if (dynobj == NULL) |
| 1529 | abort (); |
| 1530 | |
| 1531 | if (htab->elf.dynamic_sections_created) |
| 1532 | { |
| 1533 | /* Set the contents of the .interp section to the interpreter. */ |
| 1534 | if (info->executable) |
| 1535 | { |
| 1536 | s = bfd_get_section_by_name (dynobj, ".interp"); |
| 1537 | if (s == NULL) |
| 1538 | abort (); |
| 1539 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; |
| 1540 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; |
| 1541 | } |
| 1542 | } |
| 1543 | |
| 1544 | /* Set up .got offsets for local syms, and space for local dynamic |
| 1545 | relocs. */ |
| 1546 | for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) |
| 1547 | { |
| 1548 | bfd_signed_vma *local_got; |
| 1549 | bfd_signed_vma *end_local_got; |
| 1550 | char *local_tls_type; |
| 1551 | bfd_size_type locsymcount; |
| 1552 | Elf_Internal_Shdr *symtab_hdr; |
| 1553 | asection *srel; |
| 1554 | |
| 1555 | if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) |
| 1556 | continue; |
| 1557 | |
| 1558 | for (s = ibfd->sections; s != NULL; s = s->next) |
| 1559 | { |
| 1560 | struct elf64_x86_64_dyn_relocs *p; |
| 1561 | |
| 1562 | for (p = *((struct elf64_x86_64_dyn_relocs **) |
| 1563 | &elf_section_data (s)->local_dynrel); |
| 1564 | p != NULL; |
| 1565 | p = p->next) |
| 1566 | { |
| 1567 | if (!bfd_is_abs_section (p->sec) |
| 1568 | && bfd_is_abs_section (p->sec->output_section)) |
| 1569 | { |
| 1570 | /* Input section has been discarded, either because |
| 1571 | it is a copy of a linkonce section or due to |
| 1572 | linker script /DISCARD/, so we'll be discarding |
| 1573 | the relocs too. */ |
| 1574 | } |
| 1575 | else if (p->count != 0) |
| 1576 | { |
| 1577 | srel = elf_section_data (p->sec)->sreloc; |
| 1578 | srel->_raw_size += p->count * sizeof (Elf64_External_Rela); |
| 1579 | if ((p->sec->output_section->flags & SEC_READONLY) != 0) |
| 1580 | info->flags |= DF_TEXTREL; |
| 1581 | |
| 1582 | } |
| 1583 | } |
| 1584 | } |
| 1585 | |
| 1586 | local_got = elf_local_got_refcounts (ibfd); |
| 1587 | if (!local_got) |
| 1588 | continue; |
| 1589 | |
| 1590 | symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; |
| 1591 | locsymcount = symtab_hdr->sh_info; |
| 1592 | end_local_got = local_got + locsymcount; |
| 1593 | local_tls_type = elf64_x86_64_local_got_tls_type (ibfd); |
| 1594 | s = htab->sgot; |
| 1595 | srel = htab->srelgot; |
| 1596 | for (; local_got < end_local_got; ++local_got, ++local_tls_type) |
| 1597 | { |
| 1598 | if (*local_got > 0) |
| 1599 | { |
| 1600 | *local_got = s->_raw_size; |
| 1601 | s->_raw_size += GOT_ENTRY_SIZE; |
| 1602 | if (*local_tls_type == GOT_TLS_GD) |
| 1603 | s->_raw_size += GOT_ENTRY_SIZE; |
| 1604 | if (info->shared |
| 1605 | || *local_tls_type == GOT_TLS_GD |
| 1606 | || *local_tls_type == GOT_TLS_IE) |
| 1607 | srel->_raw_size += sizeof (Elf64_External_Rela); |
| 1608 | } |
| 1609 | else |
| 1610 | *local_got = (bfd_vma) -1; |
| 1611 | } |
| 1612 | } |
| 1613 | |
| 1614 | if (htab->tls_ld_got.refcount > 0) |
| 1615 | { |
| 1616 | /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD |
| 1617 | relocs. */ |
| 1618 | htab->tls_ld_got.offset = htab->sgot->_raw_size; |
| 1619 | htab->sgot->_raw_size += 2 * GOT_ENTRY_SIZE; |
| 1620 | htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); |
| 1621 | } |
| 1622 | else |
| 1623 | htab->tls_ld_got.offset = -1; |
| 1624 | |
| 1625 | /* Allocate global sym .plt and .got entries, and space for global |
| 1626 | sym dynamic relocs. */ |
| 1627 | elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info); |
| 1628 | |
| 1629 | /* We now have determined the sizes of the various dynamic sections. |
| 1630 | Allocate memory for them. */ |
| 1631 | relocs = FALSE; |
| 1632 | for (s = dynobj->sections; s != NULL; s = s->next) |
| 1633 | { |
| 1634 | if ((s->flags & SEC_LINKER_CREATED) == 0) |
| 1635 | continue; |
| 1636 | |
| 1637 | if (s == htab->splt |
| 1638 | || s == htab->sgot |
| 1639 | || s == htab->sgotplt) |
| 1640 | { |
| 1641 | /* Strip this section if we don't need it; see the |
| 1642 | comment below. */ |
| 1643 | } |
| 1644 | else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) |
| 1645 | { |
| 1646 | if (s->_raw_size != 0 && s != htab->srelplt) |
| 1647 | relocs = TRUE; |
| 1648 | |
| 1649 | /* We use the reloc_count field as a counter if we need |
| 1650 | to copy relocs into the output file. */ |
| 1651 | s->reloc_count = 0; |
| 1652 | } |
| 1653 | else |
| 1654 | { |
| 1655 | /* It's not one of our sections, so don't allocate space. */ |
| 1656 | continue; |
| 1657 | } |
| 1658 | |
| 1659 | if (s->_raw_size == 0) |
| 1660 | { |
| 1661 | /* If we don't need this section, strip it from the |
| 1662 | output file. This is mostly to handle .rela.bss and |
| 1663 | .rela.plt. We must create both sections in |
| 1664 | create_dynamic_sections, because they must be created |
| 1665 | before the linker maps input sections to output |
| 1666 | sections. The linker does that before |
| 1667 | adjust_dynamic_symbol is called, and it is that |
| 1668 | function which decides whether anything needs to go |
| 1669 | into these sections. */ |
| 1670 | |
| 1671 | _bfd_strip_section_from_output (info, s); |
| 1672 | continue; |
| 1673 | } |
| 1674 | |
| 1675 | /* Allocate memory for the section contents. We use bfd_zalloc |
| 1676 | here in case unused entries are not reclaimed before the |
| 1677 | section's contents are written out. This should not happen, |
| 1678 | but this way if it does, we get a R_X86_64_NONE reloc instead |
| 1679 | of garbage. */ |
| 1680 | s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); |
| 1681 | if (s->contents == NULL) |
| 1682 | return FALSE; |
| 1683 | } |
| 1684 | |
| 1685 | if (htab->elf.dynamic_sections_created) |
| 1686 | { |
| 1687 | /* Add some entries to the .dynamic section. We fill in the |
| 1688 | values later, in elf64_x86_64_finish_dynamic_sections, but we |
| 1689 | must add the entries now so that we get the correct size for |
| 1690 | the .dynamic section. The DT_DEBUG entry is filled in by the |
| 1691 | dynamic linker and used by the debugger. */ |
| 1692 | #define add_dynamic_entry(TAG, VAL) \ |
| 1693 | bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL)) |
| 1694 | |
| 1695 | if (info->executable) |
| 1696 | { |
| 1697 | if (!add_dynamic_entry (DT_DEBUG, 0)) |
| 1698 | return FALSE; |
| 1699 | } |
| 1700 | |
| 1701 | if (htab->splt->_raw_size != 0) |
| 1702 | { |
| 1703 | if (!add_dynamic_entry (DT_PLTGOT, 0) |
| 1704 | || !add_dynamic_entry (DT_PLTRELSZ, 0) |
| 1705 | || !add_dynamic_entry (DT_PLTREL, DT_RELA) |
| 1706 | || !add_dynamic_entry (DT_JMPREL, 0)) |
| 1707 | return FALSE; |
| 1708 | } |
| 1709 | |
| 1710 | if (relocs) |
| 1711 | { |
| 1712 | if (!add_dynamic_entry (DT_RELA, 0) |
| 1713 | || !add_dynamic_entry (DT_RELASZ, 0) |
| 1714 | || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) |
| 1715 | return FALSE; |
| 1716 | |
| 1717 | /* If any dynamic relocs apply to a read-only section, |
| 1718 | then we need a DT_TEXTREL entry. */ |
| 1719 | if ((info->flags & DF_TEXTREL) == 0) |
| 1720 | elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, |
| 1721 | (PTR) info); |
| 1722 | |
| 1723 | if ((info->flags & DF_TEXTREL) != 0) |
| 1724 | { |
| 1725 | if (!add_dynamic_entry (DT_TEXTREL, 0)) |
| 1726 | return FALSE; |
| 1727 | } |
| 1728 | } |
| 1729 | } |
| 1730 | #undef add_dynamic_entry |
| 1731 | |
| 1732 | return TRUE; |
| 1733 | } |
| 1734 | |
| 1735 | /* Return the base VMA address which should be subtracted from real addresses |
| 1736 | when resolving @dtpoff relocation. |
| 1737 | This is PT_TLS segment p_vaddr. */ |
| 1738 | |
| 1739 | static bfd_vma |
| 1740 | dtpoff_base (struct bfd_link_info *info) |
| 1741 | { |
| 1742 | /* If tls_segment is NULL, we should have signalled an error already. */ |
| 1743 | if (elf_hash_table (info)->tls_segment == NULL) |
| 1744 | return 0; |
| 1745 | return elf_hash_table (info)->tls_segment->start; |
| 1746 | } |
| 1747 | |
| 1748 | /* Return the relocation value for @tpoff relocation |
| 1749 | if STT_TLS virtual address is ADDRESS. */ |
| 1750 | |
| 1751 | static bfd_vma |
| 1752 | tpoff (struct bfd_link_info *info, bfd_vma address) |
| 1753 | { |
| 1754 | struct elf_link_tls_segment *tls_segment |
| 1755 | = elf_hash_table (info)->tls_segment; |
| 1756 | |
| 1757 | /* If tls_segment is NULL, we should have signalled an error already. */ |
| 1758 | if (tls_segment == NULL) |
| 1759 | return 0; |
| 1760 | return address - align_power (tls_segment->size, tls_segment->align) |
| 1761 | - tls_segment->start; |
| 1762 | } |
| 1763 | |
| 1764 | /* Relocate an x86_64 ELF section. */ |
| 1765 | |
| 1766 | static bfd_boolean |
| 1767 | elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info, |
| 1768 | bfd *input_bfd, asection *input_section, |
| 1769 | bfd_byte *contents, Elf_Internal_Rela *relocs, |
| 1770 | Elf_Internal_Sym *local_syms, |
| 1771 | asection **local_sections) |
| 1772 | { |
| 1773 | struct elf64_x86_64_link_hash_table *htab; |
| 1774 | Elf_Internal_Shdr *symtab_hdr; |
| 1775 | struct elf_link_hash_entry **sym_hashes; |
| 1776 | bfd_vma *local_got_offsets; |
| 1777 | Elf_Internal_Rela *rel; |
| 1778 | Elf_Internal_Rela *relend; |
| 1779 | |
| 1780 | if (info->relocatable) |
| 1781 | return TRUE; |
| 1782 | |
| 1783 | htab = elf64_x86_64_hash_table (info); |
| 1784 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| 1785 | sym_hashes = elf_sym_hashes (input_bfd); |
| 1786 | local_got_offsets = elf_local_got_offsets (input_bfd); |
| 1787 | |
| 1788 | rel = relocs; |
| 1789 | relend = relocs + input_section->reloc_count; |
| 1790 | for (; rel < relend; rel++) |
| 1791 | { |
| 1792 | unsigned int r_type; |
| 1793 | reloc_howto_type *howto; |
| 1794 | unsigned long r_symndx; |
| 1795 | struct elf_link_hash_entry *h; |
| 1796 | Elf_Internal_Sym *sym; |
| 1797 | asection *sec; |
| 1798 | bfd_vma off; |
| 1799 | bfd_vma relocation; |
| 1800 | bfd_boolean unresolved_reloc; |
| 1801 | bfd_reloc_status_type r; |
| 1802 | int tls_type; |
| 1803 | |
| 1804 | r_type = ELF64_R_TYPE (rel->r_info); |
| 1805 | if (r_type == (int) R_X86_64_GNU_VTINHERIT |
| 1806 | || r_type == (int) R_X86_64_GNU_VTENTRY) |
| 1807 | continue; |
| 1808 | |
| 1809 | if (r_type >= R_X86_64_max) |
| 1810 | { |
| 1811 | bfd_set_error (bfd_error_bad_value); |
| 1812 | return FALSE; |
| 1813 | } |
| 1814 | |
| 1815 | howto = x86_64_elf_howto_table + r_type; |
| 1816 | r_symndx = ELF64_R_SYM (rel->r_info); |
| 1817 | h = NULL; |
| 1818 | sym = NULL; |
| 1819 | sec = NULL; |
| 1820 | unresolved_reloc = FALSE; |
| 1821 | if (r_symndx < symtab_hdr->sh_info) |
| 1822 | { |
| 1823 | sym = local_syms + r_symndx; |
| 1824 | sec = local_sections[r_symndx]; |
| 1825 | |
| 1826 | relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); |
| 1827 | } |
| 1828 | else |
| 1829 | { |
| 1830 | bfd_boolean warned; |
| 1831 | |
| 1832 | RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx, |
| 1833 | symtab_hdr, relocation, sec, |
| 1834 | unresolved_reloc, info, |
| 1835 | warned); |
| 1836 | } |
| 1837 | /* When generating a shared object, the relocations handled here are |
| 1838 | copied into the output file to be resolved at run time. */ |
| 1839 | switch (r_type) |
| 1840 | { |
| 1841 | case R_X86_64_GOT32: |
| 1842 | /* Relocation is to the entry for this symbol in the global |
| 1843 | offset table. */ |
| 1844 | case R_X86_64_GOTPCREL: |
| 1845 | /* Use global offset table as symbol value. */ |
| 1846 | if (htab->sgot == NULL) |
| 1847 | abort (); |
| 1848 | |
| 1849 | if (h != NULL) |
| 1850 | { |
| 1851 | bfd_boolean dyn; |
| 1852 | |
| 1853 | off = h->got.offset; |
| 1854 | dyn = htab->elf.dynamic_sections_created; |
| 1855 | |
| 1856 | if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) |
| 1857 | || (info->shared |
| 1858 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 1859 | || (ELF_ST_VISIBILITY (h->other) |
| 1860 | && h->root.type == bfd_link_hash_undefweak)) |
| 1861 | { |
| 1862 | /* This is actually a static link, or it is a -Bsymbolic |
| 1863 | link and the symbol is defined locally, or the symbol |
| 1864 | was forced to be local because of a version file. We |
| 1865 | must initialize this entry in the global offset table. |
| 1866 | Since the offset must always be a multiple of 8, we |
| 1867 | use the least significant bit to record whether we |
| 1868 | have initialized it already. |
| 1869 | |
| 1870 | When doing a dynamic link, we create a .rela.got |
| 1871 | relocation entry to initialize the value. This is |
| 1872 | done in the finish_dynamic_symbol routine. */ |
| 1873 | if ((off & 1) != 0) |
| 1874 | off &= ~1; |
| 1875 | else |
| 1876 | { |
| 1877 | bfd_put_64 (output_bfd, relocation, |
| 1878 | htab->sgot->contents + off); |
| 1879 | h->got.offset |= 1; |
| 1880 | } |
| 1881 | } |
| 1882 | else |
| 1883 | unresolved_reloc = FALSE; |
| 1884 | } |
| 1885 | else |
| 1886 | { |
| 1887 | if (local_got_offsets == NULL) |
| 1888 | abort (); |
| 1889 | |
| 1890 | off = local_got_offsets[r_symndx]; |
| 1891 | |
| 1892 | /* The offset must always be a multiple of 8. We use |
| 1893 | the least significant bit to record whether we have |
| 1894 | already generated the necessary reloc. */ |
| 1895 | if ((off & 1) != 0) |
| 1896 | off &= ~1; |
| 1897 | else |
| 1898 | { |
| 1899 | bfd_put_64 (output_bfd, relocation, |
| 1900 | htab->sgot->contents + off); |
| 1901 | |
| 1902 | if (info->shared) |
| 1903 | { |
| 1904 | asection *s; |
| 1905 | Elf_Internal_Rela outrel; |
| 1906 | bfd_byte *loc; |
| 1907 | |
| 1908 | /* We need to generate a R_X86_64_RELATIVE reloc |
| 1909 | for the dynamic linker. */ |
| 1910 | s = htab->srelgot; |
| 1911 | if (s == NULL) |
| 1912 | abort (); |
| 1913 | |
| 1914 | outrel.r_offset = (htab->sgot->output_section->vma |
| 1915 | + htab->sgot->output_offset |
| 1916 | + off); |
| 1917 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); |
| 1918 | outrel.r_addend = relocation; |
| 1919 | loc = s->contents; |
| 1920 | loc += s->reloc_count++ * sizeof (Elf64_External_Rela); |
| 1921 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 1922 | } |
| 1923 | |
| 1924 | local_got_offsets[r_symndx] |= 1; |
| 1925 | } |
| 1926 | } |
| 1927 | |
| 1928 | if (off >= (bfd_vma) -2) |
| 1929 | abort (); |
| 1930 | |
| 1931 | relocation = htab->sgot->output_offset + off; |
| 1932 | if (r_type == R_X86_64_GOTPCREL) |
| 1933 | relocation += htab->sgot->output_section->vma; |
| 1934 | |
| 1935 | break; |
| 1936 | |
| 1937 | case R_X86_64_PLT32: |
| 1938 | /* Relocation is to the entry for this symbol in the |
| 1939 | procedure linkage table. */ |
| 1940 | |
| 1941 | /* Resolve a PLT32 reloc against a local symbol directly, |
| 1942 | without using the procedure linkage table. */ |
| 1943 | if (h == NULL) |
| 1944 | break; |
| 1945 | |
| 1946 | if (h->plt.offset == (bfd_vma) -1 |
| 1947 | || htab->splt == NULL) |
| 1948 | { |
| 1949 | /* We didn't make a PLT entry for this symbol. This |
| 1950 | happens when statically linking PIC code, or when |
| 1951 | using -Bsymbolic. */ |
| 1952 | break; |
| 1953 | } |
| 1954 | |
| 1955 | relocation = (htab->splt->output_section->vma |
| 1956 | + htab->splt->output_offset |
| 1957 | + h->plt.offset); |
| 1958 | unresolved_reloc = FALSE; |
| 1959 | break; |
| 1960 | |
| 1961 | case R_X86_64_PC8: |
| 1962 | case R_X86_64_PC16: |
| 1963 | case R_X86_64_PC32: |
| 1964 | case R_X86_64_8: |
| 1965 | case R_X86_64_16: |
| 1966 | case R_X86_64_32: |
| 1967 | case R_X86_64_64: |
| 1968 | /* FIXME: The ABI says the linker should make sure the value is |
| 1969 | the same when it's zeroextended to 64 bit. */ |
| 1970 | |
| 1971 | /* r_symndx will be zero only for relocs against symbols |
| 1972 | from removed linkonce sections, or sections discarded by |
| 1973 | a linker script. */ |
| 1974 | if (r_symndx == 0 |
| 1975 | || (input_section->flags & SEC_ALLOC) == 0) |
| 1976 | break; |
| 1977 | |
| 1978 | if ((info->shared |
| 1979 | && (h == NULL |
| 1980 | || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT |
| 1981 | || h->root.type != bfd_link_hash_undefweak) |
| 1982 | && ((r_type != R_X86_64_PC8 |
| 1983 | && r_type != R_X86_64_PC16 |
| 1984 | && r_type != R_X86_64_PC32) |
| 1985 | || !SYMBOL_CALLS_LOCAL (info, h))) |
| 1986 | || (ELIMINATE_COPY_RELOCS |
| 1987 | && !info->shared |
| 1988 | && h != NULL |
| 1989 | && h->dynindx != -1 |
| 1990 | && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 |
| 1991 | && (((h->elf_link_hash_flags |
| 1992 | & ELF_LINK_HASH_DEF_DYNAMIC) != 0 |
| 1993 | && (h->elf_link_hash_flags |
| 1994 | & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 1995 | || h->root.type == bfd_link_hash_undefweak |
| 1996 | || h->root.type == bfd_link_hash_undefined))) |
| 1997 | { |
| 1998 | Elf_Internal_Rela outrel; |
| 1999 | bfd_byte *loc; |
| 2000 | bfd_boolean skip, relocate; |
| 2001 | asection *sreloc; |
| 2002 | |
| 2003 | /* When generating a shared object, these relocations |
| 2004 | are copied into the output file to be resolved at run |
| 2005 | time. */ |
| 2006 | skip = FALSE; |
| 2007 | relocate = FALSE; |
| 2008 | |
| 2009 | outrel.r_offset = |
| 2010 | _bfd_elf_section_offset (output_bfd, info, input_section, |
| 2011 | rel->r_offset); |
| 2012 | if (outrel.r_offset == (bfd_vma) -1) |
| 2013 | skip = TRUE; |
| 2014 | else if (outrel.r_offset == (bfd_vma) -2) |
| 2015 | skip = TRUE, relocate = TRUE; |
| 2016 | |
| 2017 | outrel.r_offset += (input_section->output_section->vma |
| 2018 | + input_section->output_offset); |
| 2019 | |
| 2020 | if (skip) |
| 2021 | memset (&outrel, 0, sizeof outrel); |
| 2022 | |
| 2023 | /* h->dynindx may be -1 if this symbol was marked to |
| 2024 | become local. */ |
| 2025 | else if (h != NULL |
| 2026 | && h->dynindx != -1 |
| 2027 | && (r_type == R_X86_64_PC8 |
| 2028 | || r_type == R_X86_64_PC16 |
| 2029 | || r_type == R_X86_64_PC32 |
| 2030 | || !info->shared |
| 2031 | || !info->symbolic |
| 2032 | || (h->elf_link_hash_flags |
| 2033 | & ELF_LINK_HASH_DEF_REGULAR) == 0)) |
| 2034 | { |
| 2035 | outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); |
| 2036 | outrel.r_addend = rel->r_addend; |
| 2037 | } |
| 2038 | else |
| 2039 | { |
| 2040 | /* This symbol is local, or marked to become local. */ |
| 2041 | if (r_type == R_X86_64_64) |
| 2042 | { |
| 2043 | relocate = TRUE; |
| 2044 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); |
| 2045 | outrel.r_addend = relocation + rel->r_addend; |
| 2046 | } |
| 2047 | else |
| 2048 | { |
| 2049 | long sindx; |
| 2050 | |
| 2051 | if (h == NULL) |
| 2052 | sec = local_sections[r_symndx]; |
| 2053 | else |
| 2054 | { |
| 2055 | BFD_ASSERT (h->root.type == bfd_link_hash_defined |
| 2056 | || (h->root.type |
| 2057 | == bfd_link_hash_defweak)); |
| 2058 | sec = h->root.u.def.section; |
| 2059 | } |
| 2060 | if (sec != NULL && bfd_is_abs_section (sec)) |
| 2061 | sindx = 0; |
| 2062 | else if (sec == NULL || sec->owner == NULL) |
| 2063 | { |
| 2064 | bfd_set_error (bfd_error_bad_value); |
| 2065 | return FALSE; |
| 2066 | } |
| 2067 | else |
| 2068 | { |
| 2069 | asection *osec; |
| 2070 | |
| 2071 | osec = sec->output_section; |
| 2072 | sindx = elf_section_data (osec)->dynindx; |
| 2073 | BFD_ASSERT (sindx > 0); |
| 2074 | } |
| 2075 | |
| 2076 | outrel.r_info = ELF64_R_INFO (sindx, r_type); |
| 2077 | outrel.r_addend = relocation + rel->r_addend; |
| 2078 | } |
| 2079 | } |
| 2080 | |
| 2081 | sreloc = elf_section_data (input_section)->sreloc; |
| 2082 | if (sreloc == NULL) |
| 2083 | abort (); |
| 2084 | |
| 2085 | loc = sreloc->contents; |
| 2086 | loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); |
| 2087 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 2088 | |
| 2089 | /* If this reloc is against an external symbol, we do |
| 2090 | not want to fiddle with the addend. Otherwise, we |
| 2091 | need to include the symbol value so that it becomes |
| 2092 | an addend for the dynamic reloc. */ |
| 2093 | if (! relocate) |
| 2094 | continue; |
| 2095 | } |
| 2096 | |
| 2097 | break; |
| 2098 | |
| 2099 | case R_X86_64_TLSGD: |
| 2100 | case R_X86_64_GOTTPOFF: |
| 2101 | r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL); |
| 2102 | tls_type = GOT_UNKNOWN; |
| 2103 | if (h == NULL && local_got_offsets) |
| 2104 | tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx]; |
| 2105 | else if (h != NULL) |
| 2106 | { |
| 2107 | tls_type = elf64_x86_64_hash_entry (h)->tls_type; |
| 2108 | if (!info->shared && h->dynindx == -1 && tls_type == GOT_TLS_IE) |
| 2109 | r_type = R_X86_64_TPOFF32; |
| 2110 | } |
| 2111 | if (r_type == R_X86_64_TLSGD) |
| 2112 | { |
| 2113 | if (tls_type == GOT_TLS_IE) |
| 2114 | r_type = R_X86_64_GOTTPOFF; |
| 2115 | } |
| 2116 | |
| 2117 | if (r_type == R_X86_64_TPOFF32) |
| 2118 | { |
| 2119 | BFD_ASSERT (! unresolved_reloc); |
| 2120 | if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD) |
| 2121 | { |
| 2122 | unsigned int i; |
| 2123 | static unsigned char tlsgd[8] |
| 2124 | = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 }; |
| 2125 | |
| 2126 | /* GD->LE transition. |
| 2127 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 2128 | .word 0x6666; rex64; call __tls_get_addr@plt |
| 2129 | Change it into: |
| 2130 | movq %fs:0, %rax |
| 2131 | leaq foo@tpoff(%rax), %rax */ |
| 2132 | BFD_ASSERT (rel->r_offset >= 4); |
| 2133 | for (i = 0; i < 4; i++) |
| 2134 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2135 | contents + rel->r_offset - 4 + i) |
| 2136 | == tlsgd[i]); |
| 2137 | BFD_ASSERT (rel->r_offset + 12 <= input_section->_raw_size); |
| 2138 | for (i = 0; i < 4; i++) |
| 2139 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2140 | contents + rel->r_offset + 4 + i) |
| 2141 | == tlsgd[i+4]); |
| 2142 | BFD_ASSERT (rel + 1 < relend); |
| 2143 | BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); |
| 2144 | memcpy (contents + rel->r_offset - 4, |
| 2145 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0", |
| 2146 | 16); |
| 2147 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2148 | contents + rel->r_offset + 8); |
| 2149 | /* Skip R_X86_64_PLT32. */ |
| 2150 | rel++; |
| 2151 | continue; |
| 2152 | } |
| 2153 | else |
| 2154 | { |
| 2155 | unsigned int val, type, reg; |
| 2156 | |
| 2157 | /* IE->LE transition: |
| 2158 | Originally it can be one of: |
| 2159 | movq foo@gottpoff(%rip), %reg |
| 2160 | addq foo@gottpoff(%rip), %reg |
| 2161 | We change it into: |
| 2162 | movq $foo, %reg |
| 2163 | leaq foo(%reg), %reg |
| 2164 | addq $foo, %reg. */ |
| 2165 | BFD_ASSERT (rel->r_offset >= 3); |
| 2166 | val = bfd_get_8 (input_bfd, contents + rel->r_offset - 3); |
| 2167 | BFD_ASSERT (val == 0x48 || val == 0x4c); |
| 2168 | type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2); |
| 2169 | BFD_ASSERT (type == 0x8b || type == 0x03); |
| 2170 | reg = bfd_get_8 (input_bfd, contents + rel->r_offset - 1); |
| 2171 | BFD_ASSERT ((reg & 0xc7) == 5); |
| 2172 | reg >>= 3; |
| 2173 | BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size); |
| 2174 | if (type == 0x8b) |
| 2175 | { |
| 2176 | /* movq */ |
| 2177 | if (val == 0x4c) |
| 2178 | bfd_put_8 (output_bfd, 0x49, |
| 2179 | contents + rel->r_offset - 3); |
| 2180 | bfd_put_8 (output_bfd, 0xc7, |
| 2181 | contents + rel->r_offset - 2); |
| 2182 | bfd_put_8 (output_bfd, 0xc0 | reg, |
| 2183 | contents + rel->r_offset - 1); |
| 2184 | } |
| 2185 | else if (reg == 4) |
| 2186 | { |
| 2187 | /* addq -> addq - addressing with %rsp/%r12 is |
| 2188 | special */ |
| 2189 | if (val == 0x4c) |
| 2190 | bfd_put_8 (output_bfd, 0x49, |
| 2191 | contents + rel->r_offset - 3); |
| 2192 | bfd_put_8 (output_bfd, 0x81, |
| 2193 | contents + rel->r_offset - 2); |
| 2194 | bfd_put_8 (output_bfd, 0xc0 | reg, |
| 2195 | contents + rel->r_offset - 1); |
| 2196 | } |
| 2197 | else |
| 2198 | { |
| 2199 | /* addq -> leaq */ |
| 2200 | if (val == 0x4c) |
| 2201 | bfd_put_8 (output_bfd, 0x4d, |
| 2202 | contents + rel->r_offset - 3); |
| 2203 | bfd_put_8 (output_bfd, 0x8d, |
| 2204 | contents + rel->r_offset - 2); |
| 2205 | bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3), |
| 2206 | contents + rel->r_offset - 1); |
| 2207 | } |
| 2208 | bfd_put_32 (output_bfd, tpoff (info, relocation), |
| 2209 | contents + rel->r_offset); |
| 2210 | continue; |
| 2211 | } |
| 2212 | } |
| 2213 | |
| 2214 | if (htab->sgot == NULL) |
| 2215 | abort (); |
| 2216 | |
| 2217 | if (h != NULL) |
| 2218 | off = h->got.offset; |
| 2219 | else |
| 2220 | { |
| 2221 | if (local_got_offsets == NULL) |
| 2222 | abort (); |
| 2223 | |
| 2224 | off = local_got_offsets[r_symndx]; |
| 2225 | } |
| 2226 | |
| 2227 | if ((off & 1) != 0) |
| 2228 | off &= ~1; |
| 2229 | else |
| 2230 | { |
| 2231 | Elf_Internal_Rela outrel; |
| 2232 | bfd_byte *loc; |
| 2233 | int dr_type, indx; |
| 2234 | |
| 2235 | if (htab->srelgot == NULL) |
| 2236 | abort (); |
| 2237 | |
| 2238 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2239 | + htab->sgot->output_offset + off); |
| 2240 | |
| 2241 | indx = h && h->dynindx != -1 ? h->dynindx : 0; |
| 2242 | if (r_type == R_X86_64_TLSGD) |
| 2243 | dr_type = R_X86_64_DTPMOD64; |
| 2244 | else |
| 2245 | dr_type = R_X86_64_TPOFF64; |
| 2246 | |
| 2247 | bfd_put_64 (output_bfd, 0, htab->sgot->contents + off); |
| 2248 | outrel.r_addend = 0; |
| 2249 | if (dr_type == R_X86_64_TPOFF64 && indx == 0) |
| 2250 | outrel.r_addend = relocation - dtpoff_base (info); |
| 2251 | outrel.r_info = ELF64_R_INFO (indx, dr_type); |
| 2252 | |
| 2253 | loc = htab->srelgot->contents; |
| 2254 | loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); |
| 2255 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 2256 | |
| 2257 | if (r_type == R_X86_64_TLSGD) |
| 2258 | { |
| 2259 | if (indx == 0) |
| 2260 | { |
| 2261 | BFD_ASSERT (! unresolved_reloc); |
| 2262 | bfd_put_64 (output_bfd, |
| 2263 | relocation - dtpoff_base (info), |
| 2264 | htab->sgot->contents + off + GOT_ENTRY_SIZE); |
| 2265 | } |
| 2266 | else |
| 2267 | { |
| 2268 | bfd_put_64 (output_bfd, 0, |
| 2269 | htab->sgot->contents + off + GOT_ENTRY_SIZE); |
| 2270 | outrel.r_info = ELF64_R_INFO (indx, |
| 2271 | R_X86_64_DTPOFF64); |
| 2272 | outrel.r_offset += GOT_ENTRY_SIZE; |
| 2273 | htab->srelgot->reloc_count++; |
| 2274 | loc += sizeof (Elf64_External_Rela); |
| 2275 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 2276 | } |
| 2277 | } |
| 2278 | |
| 2279 | if (h != NULL) |
| 2280 | h->got.offset |= 1; |
| 2281 | else |
| 2282 | local_got_offsets[r_symndx] |= 1; |
| 2283 | } |
| 2284 | |
| 2285 | if (off >= (bfd_vma) -2) |
| 2286 | abort (); |
| 2287 | if (r_type == ELF64_R_TYPE (rel->r_info)) |
| 2288 | { |
| 2289 | relocation = htab->sgot->output_section->vma |
| 2290 | + htab->sgot->output_offset + off; |
| 2291 | unresolved_reloc = FALSE; |
| 2292 | } |
| 2293 | else |
| 2294 | { |
| 2295 | unsigned int i; |
| 2296 | static unsigned char tlsgd[8] |
| 2297 | = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 }; |
| 2298 | |
| 2299 | /* GD->IE transition. |
| 2300 | .byte 0x66; leaq foo@tlsgd(%rip), %rdi |
| 2301 | .word 0x6666; rex64; call __tls_get_addr@plt |
| 2302 | Change it into: |
| 2303 | movq %fs:0, %rax |
| 2304 | addq foo@gottpoff(%rip), %rax */ |
| 2305 | BFD_ASSERT (rel->r_offset >= 4); |
| 2306 | for (i = 0; i < 4; i++) |
| 2307 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2308 | contents + rel->r_offset - 4 + i) |
| 2309 | == tlsgd[i]); |
| 2310 | BFD_ASSERT (rel->r_offset + 12 <= input_section->_raw_size); |
| 2311 | for (i = 0; i < 4; i++) |
| 2312 | BFD_ASSERT (bfd_get_8 (input_bfd, |
| 2313 | contents + rel->r_offset + 4 + i) |
| 2314 | == tlsgd[i+4]); |
| 2315 | BFD_ASSERT (rel + 1 < relend); |
| 2316 | BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); |
| 2317 | memcpy (contents + rel->r_offset - 4, |
| 2318 | "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0", |
| 2319 | 16); |
| 2320 | |
| 2321 | relocation = (htab->sgot->output_section->vma |
| 2322 | + htab->sgot->output_offset + off |
| 2323 | - rel->r_offset |
| 2324 | - input_section->output_section->vma |
| 2325 | - input_section->output_offset |
| 2326 | - 12); |
| 2327 | bfd_put_32 (output_bfd, relocation, |
| 2328 | contents + rel->r_offset + 8); |
| 2329 | /* Skip R_X86_64_PLT32. */ |
| 2330 | rel++; |
| 2331 | continue; |
| 2332 | } |
| 2333 | break; |
| 2334 | |
| 2335 | case R_X86_64_TLSLD: |
| 2336 | if (! info->shared) |
| 2337 | { |
| 2338 | /* LD->LE transition: |
| 2339 | Ensure it is: |
| 2340 | leaq foo@tlsld(%rip), %rdi; call __tls_get_addr@plt. |
| 2341 | We change it into: |
| 2342 | .word 0x6666; .byte 0x66; movl %fs:0, %rax. */ |
| 2343 | BFD_ASSERT (rel->r_offset >= 3); |
| 2344 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 3) |
| 2345 | == 0x48); |
| 2346 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2) |
| 2347 | == 0x8d); |
| 2348 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 1) |
| 2349 | == 0x3d); |
| 2350 | BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size); |
| 2351 | BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4) |
| 2352 | == 0xe8); |
| 2353 | BFD_ASSERT (rel + 1 < relend); |
| 2354 | BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32); |
| 2355 | memcpy (contents + rel->r_offset - 3, |
| 2356 | "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12); |
| 2357 | /* Skip R_X86_64_PLT32. */ |
| 2358 | rel++; |
| 2359 | continue; |
| 2360 | } |
| 2361 | |
| 2362 | if (htab->sgot == NULL) |
| 2363 | abort (); |
| 2364 | |
| 2365 | off = htab->tls_ld_got.offset; |
| 2366 | if (off & 1) |
| 2367 | off &= ~1; |
| 2368 | else |
| 2369 | { |
| 2370 | Elf_Internal_Rela outrel; |
| 2371 | bfd_byte *loc; |
| 2372 | |
| 2373 | if (htab->srelgot == NULL) |
| 2374 | abort (); |
| 2375 | |
| 2376 | outrel.r_offset = (htab->sgot->output_section->vma |
| 2377 | + htab->sgot->output_offset + off); |
| 2378 | |
| 2379 | bfd_put_64 (output_bfd, 0, |
| 2380 | htab->sgot->contents + off); |
| 2381 | bfd_put_64 (output_bfd, 0, |
| 2382 | htab->sgot->contents + off + GOT_ENTRY_SIZE); |
| 2383 | outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64); |
| 2384 | outrel.r_addend = 0; |
| 2385 | loc = htab->srelgot->contents; |
| 2386 | loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); |
| 2387 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); |
| 2388 | htab->tls_ld_got.offset |= 1; |
| 2389 | } |
| 2390 | relocation = htab->sgot->output_section->vma |
| 2391 | + htab->sgot->output_offset + off; |
| 2392 | unresolved_reloc = FALSE; |
| 2393 | break; |
| 2394 | |
| 2395 | case R_X86_64_DTPOFF32: |
| 2396 | if (info->shared || (input_section->flags & SEC_CODE) == 0) |
| 2397 | relocation -= dtpoff_base (info); |
| 2398 | else |
| 2399 | relocation = tpoff (info, relocation); |
| 2400 | break; |
| 2401 | |
| 2402 | case R_X86_64_TPOFF32: |
| 2403 | BFD_ASSERT (! info->shared); |
| 2404 | relocation = tpoff (info, relocation); |
| 2405 | break; |
| 2406 | |
| 2407 | default: |
| 2408 | break; |
| 2409 | } |
| 2410 | |
| 2411 | /* Dynamic relocs are not propagated for SEC_DEBUGGING sections |
| 2412 | because such sections are not SEC_ALLOC and thus ld.so will |
| 2413 | not process them. */ |
| 2414 | if (unresolved_reloc |
| 2415 | && !((input_section->flags & SEC_DEBUGGING) != 0 |
| 2416 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) |
| 2417 | (*_bfd_error_handler) |
| 2418 | (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), |
| 2419 | bfd_archive_filename (input_bfd), |
| 2420 | bfd_get_section_name (input_bfd, input_section), |
| 2421 | (long) rel->r_offset, |
| 2422 | h->root.root.string); |
| 2423 | |
| 2424 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| 2425 | contents, rel->r_offset, |
| 2426 | relocation, rel->r_addend); |
| 2427 | |
| 2428 | if (r != bfd_reloc_ok) |
| 2429 | { |
| 2430 | const char *name; |
| 2431 | |
| 2432 | if (h != NULL) |
| 2433 | name = h->root.root.string; |
| 2434 | else |
| 2435 | { |
| 2436 | name = bfd_elf_string_from_elf_section (input_bfd, |
| 2437 | symtab_hdr->sh_link, |
| 2438 | sym->st_name); |
| 2439 | if (name == NULL) |
| 2440 | return FALSE; |
| 2441 | if (*name == '\0') |
| 2442 | name = bfd_section_name (input_bfd, sec); |
| 2443 | } |
| 2444 | |
| 2445 | if (r == bfd_reloc_overflow) |
| 2446 | { |
| 2447 | |
| 2448 | if (! ((*info->callbacks->reloc_overflow) |
| 2449 | (info, name, howto->name, (bfd_vma) 0, |
| 2450 | input_bfd, input_section, rel->r_offset))) |
| 2451 | return FALSE; |
| 2452 | } |
| 2453 | else |
| 2454 | { |
| 2455 | (*_bfd_error_handler) |
| 2456 | (_("%s(%s+0x%lx): reloc against `%s': error %d"), |
| 2457 | bfd_archive_filename (input_bfd), |
| 2458 | bfd_get_section_name (input_bfd, input_section), |
| 2459 | (long) rel->r_offset, name, (int) r); |
| 2460 | return FALSE; |
| 2461 | } |
| 2462 | } |
| 2463 | } |
| 2464 | |
| 2465 | return TRUE; |
| 2466 | } |
| 2467 | |
| 2468 | /* Finish up dynamic symbol handling. We set the contents of various |
| 2469 | dynamic sections here. */ |
| 2470 | |
| 2471 | static bfd_boolean |
| 2472 | elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd, |
| 2473 | struct bfd_link_info *info, |
| 2474 | struct elf_link_hash_entry *h, |
| 2475 | Elf_Internal_Sym *sym) |
| 2476 | { |
| 2477 | struct elf64_x86_64_link_hash_table *htab; |
| 2478 | |
| 2479 | htab = elf64_x86_64_hash_table (info); |
| 2480 | |
| 2481 | if (h->plt.offset != (bfd_vma) -1) |
| 2482 | { |
| 2483 | bfd_vma plt_index; |
| 2484 | bfd_vma got_offset; |
| 2485 | Elf_Internal_Rela rela; |
| 2486 | bfd_byte *loc; |
| 2487 | |
| 2488 | /* This symbol has an entry in the procedure linkage table. Set |
| 2489 | it up. */ |
| 2490 | if (h->dynindx == -1 |
| 2491 | || htab->splt == NULL |
| 2492 | || htab->sgotplt == NULL |
| 2493 | || htab->srelplt == NULL) |
| 2494 | abort (); |
| 2495 | |
| 2496 | /* Get the index in the procedure linkage table which |
| 2497 | corresponds to this symbol. This is the index of this symbol |
| 2498 | in all the symbols for which we are making plt entries. The |
| 2499 | first entry in the procedure linkage table is reserved. */ |
| 2500 | plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; |
| 2501 | |
| 2502 | /* Get the offset into the .got table of the entry that |
| 2503 | corresponds to this function. Each .got entry is GOT_ENTRY_SIZE |
| 2504 | bytes. The first three are reserved for the dynamic linker. */ |
| 2505 | got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; |
| 2506 | |
| 2507 | /* Fill in the entry in the procedure linkage table. */ |
| 2508 | memcpy (htab->splt->contents + h->plt.offset, elf64_x86_64_plt_entry, |
| 2509 | PLT_ENTRY_SIZE); |
| 2510 | |
| 2511 | /* Insert the relocation positions of the plt section. The magic |
| 2512 | numbers at the end of the statements are the positions of the |
| 2513 | relocations in the plt section. */ |
| 2514 | /* Put offset for jmp *name@GOTPCREL(%rip), since the |
| 2515 | instruction uses 6 bytes, subtract this value. */ |
| 2516 | bfd_put_32 (output_bfd, |
| 2517 | (htab->sgotplt->output_section->vma |
| 2518 | + htab->sgotplt->output_offset |
| 2519 | + got_offset |
| 2520 | - htab->splt->output_section->vma |
| 2521 | - htab->splt->output_offset |
| 2522 | - h->plt.offset |
| 2523 | - 6), |
| 2524 | htab->splt->contents + h->plt.offset + 2); |
| 2525 | /* Put relocation index. */ |
| 2526 | bfd_put_32 (output_bfd, plt_index, |
| 2527 | htab->splt->contents + h->plt.offset + 7); |
| 2528 | /* Put offset for jmp .PLT0. */ |
| 2529 | bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), |
| 2530 | htab->splt->contents + h->plt.offset + 12); |
| 2531 | |
| 2532 | /* Fill in the entry in the global offset table, initially this |
| 2533 | points to the pushq instruction in the PLT which is at offset 6. */ |
| 2534 | bfd_put_64 (output_bfd, (htab->splt->output_section->vma |
| 2535 | + htab->splt->output_offset |
| 2536 | + h->plt.offset + 6), |
| 2537 | htab->sgotplt->contents + got_offset); |
| 2538 | |
| 2539 | /* Fill in the entry in the .rela.plt section. */ |
| 2540 | rela.r_offset = (htab->sgotplt->output_section->vma |
| 2541 | + htab->sgotplt->output_offset |
| 2542 | + got_offset); |
| 2543 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT); |
| 2544 | rela.r_addend = 0; |
| 2545 | loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela); |
| 2546 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| 2547 | |
| 2548 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) |
| 2549 | { |
| 2550 | /* Mark the symbol as undefined, rather than as defined in |
| 2551 | the .plt section. Leave the value alone. This is a clue |
| 2552 | for the dynamic linker, to make function pointer |
| 2553 | comparisons work between an application and shared |
| 2554 | library. */ |
| 2555 | sym->st_shndx = SHN_UNDEF; |
| 2556 | } |
| 2557 | } |
| 2558 | |
| 2559 | if (h->got.offset != (bfd_vma) -1 |
| 2560 | && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_GD |
| 2561 | && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE) |
| 2562 | { |
| 2563 | Elf_Internal_Rela rela; |
| 2564 | bfd_byte *loc; |
| 2565 | |
| 2566 | /* This symbol has an entry in the global offset table. Set it |
| 2567 | up. */ |
| 2568 | if (htab->sgot == NULL || htab->srelgot == NULL) |
| 2569 | abort (); |
| 2570 | |
| 2571 | rela.r_offset = (htab->sgot->output_section->vma |
| 2572 | + htab->sgot->output_offset |
| 2573 | + (h->got.offset &~ (bfd_vma) 1)); |
| 2574 | |
| 2575 | /* If this is a static link, or it is a -Bsymbolic link and the |
| 2576 | symbol is defined locally or was forced to be local because |
| 2577 | of a version file, we just want to emit a RELATIVE reloc. |
| 2578 | The entry in the global offset table will already have been |
| 2579 | initialized in the relocate_section function. */ |
| 2580 | if (info->shared |
| 2581 | && SYMBOL_REFERENCES_LOCAL (info, h)) |
| 2582 | { |
| 2583 | BFD_ASSERT((h->got.offset & 1) != 0); |
| 2584 | rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); |
| 2585 | rela.r_addend = (h->root.u.def.value |
| 2586 | + h->root.u.def.section->output_section->vma |
| 2587 | + h->root.u.def.section->output_offset); |
| 2588 | } |
| 2589 | else |
| 2590 | { |
| 2591 | BFD_ASSERT((h->got.offset & 1) == 0); |
| 2592 | bfd_put_64 (output_bfd, (bfd_vma) 0, |
| 2593 | htab->sgot->contents + h->got.offset); |
| 2594 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT); |
| 2595 | rela.r_addend = 0; |
| 2596 | } |
| 2597 | |
| 2598 | loc = htab->srelgot->contents; |
| 2599 | loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela); |
| 2600 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| 2601 | } |
| 2602 | |
| 2603 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) |
| 2604 | { |
| 2605 | Elf_Internal_Rela rela; |
| 2606 | bfd_byte *loc; |
| 2607 | |
| 2608 | /* This symbol needs a copy reloc. Set it up. */ |
| 2609 | |
| 2610 | if (h->dynindx == -1 |
| 2611 | || (h->root.type != bfd_link_hash_defined |
| 2612 | && h->root.type != bfd_link_hash_defweak) |
| 2613 | || htab->srelbss == NULL) |
| 2614 | abort (); |
| 2615 | |
| 2616 | rela.r_offset = (h->root.u.def.value |
| 2617 | + h->root.u.def.section->output_section->vma |
| 2618 | + h->root.u.def.section->output_offset); |
| 2619 | rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY); |
| 2620 | rela.r_addend = 0; |
| 2621 | loc = htab->srelbss->contents; |
| 2622 | loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela); |
| 2623 | bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); |
| 2624 | } |
| 2625 | |
| 2626 | /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ |
| 2627 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 |
| 2628 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 2629 | sym->st_shndx = SHN_ABS; |
| 2630 | |
| 2631 | return TRUE; |
| 2632 | } |
| 2633 | |
| 2634 | /* Used to decide how to sort relocs in an optimal manner for the |
| 2635 | dynamic linker, before writing them out. */ |
| 2636 | |
| 2637 | static enum elf_reloc_type_class |
| 2638 | elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela) |
| 2639 | { |
| 2640 | switch ((int) ELF64_R_TYPE (rela->r_info)) |
| 2641 | { |
| 2642 | case R_X86_64_RELATIVE: |
| 2643 | return reloc_class_relative; |
| 2644 | case R_X86_64_JUMP_SLOT: |
| 2645 | return reloc_class_plt; |
| 2646 | case R_X86_64_COPY: |
| 2647 | return reloc_class_copy; |
| 2648 | default: |
| 2649 | return reloc_class_normal; |
| 2650 | } |
| 2651 | } |
| 2652 | |
| 2653 | /* Finish up the dynamic sections. */ |
| 2654 | |
| 2655 | static bfd_boolean |
| 2656 | elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) |
| 2657 | { |
| 2658 | struct elf64_x86_64_link_hash_table *htab; |
| 2659 | bfd *dynobj; |
| 2660 | asection *sdyn; |
| 2661 | |
| 2662 | htab = elf64_x86_64_hash_table (info); |
| 2663 | dynobj = htab->elf.dynobj; |
| 2664 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); |
| 2665 | |
| 2666 | if (htab->elf.dynamic_sections_created) |
| 2667 | { |
| 2668 | Elf64_External_Dyn *dyncon, *dynconend; |
| 2669 | |
| 2670 | if (sdyn == NULL || htab->sgot == NULL) |
| 2671 | abort (); |
| 2672 | |
| 2673 | dyncon = (Elf64_External_Dyn *) sdyn->contents; |
| 2674 | dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size); |
| 2675 | for (; dyncon < dynconend; dyncon++) |
| 2676 | { |
| 2677 | Elf_Internal_Dyn dyn; |
| 2678 | asection *s; |
| 2679 | |
| 2680 | bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); |
| 2681 | |
| 2682 | switch (dyn.d_tag) |
| 2683 | { |
| 2684 | default: |
| 2685 | continue; |
| 2686 | |
| 2687 | case DT_PLTGOT: |
| 2688 | dyn.d_un.d_ptr = htab->sgot->output_section->vma; |
| 2689 | break; |
| 2690 | |
| 2691 | case DT_JMPREL: |
| 2692 | dyn.d_un.d_ptr = htab->srelplt->output_section->vma; |
| 2693 | break; |
| 2694 | |
| 2695 | case DT_PLTRELSZ: |
| 2696 | s = htab->srelplt->output_section; |
| 2697 | if (s->_cooked_size != 0) |
| 2698 | dyn.d_un.d_val = s->_cooked_size; |
| 2699 | else |
| 2700 | dyn.d_un.d_val = s->_raw_size; |
| 2701 | break; |
| 2702 | |
| 2703 | case DT_RELASZ: |
| 2704 | /* The procedure linkage table relocs (DT_JMPREL) should |
| 2705 | not be included in the overall relocs (DT_RELA). |
| 2706 | Therefore, we override the DT_RELASZ entry here to |
| 2707 | make it not include the JMPREL relocs. Since the |
| 2708 | linker script arranges for .rela.plt to follow all |
| 2709 | other relocation sections, we don't have to worry |
| 2710 | about changing the DT_RELA entry. */ |
| 2711 | if (htab->srelplt != NULL) |
| 2712 | { |
| 2713 | s = htab->srelplt->output_section; |
| 2714 | if (s->_cooked_size != 0) |
| 2715 | dyn.d_un.d_val -= s->_cooked_size; |
| 2716 | else |
| 2717 | dyn.d_un.d_val -= s->_raw_size; |
| 2718 | } |
| 2719 | break; |
| 2720 | } |
| 2721 | |
| 2722 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); |
| 2723 | } |
| 2724 | |
| 2725 | /* Fill in the special first entry in the procedure linkage table. */ |
| 2726 | if (htab->splt && htab->splt->_raw_size > 0) |
| 2727 | { |
| 2728 | /* Fill in the first entry in the procedure linkage table. */ |
| 2729 | memcpy (htab->splt->contents, elf64_x86_64_plt0_entry, |
| 2730 | PLT_ENTRY_SIZE); |
| 2731 | /* Add offset for pushq GOT+8(%rip), since the instruction |
| 2732 | uses 6 bytes subtract this value. */ |
| 2733 | bfd_put_32 (output_bfd, |
| 2734 | (htab->sgotplt->output_section->vma |
| 2735 | + htab->sgotplt->output_offset |
| 2736 | + 8 |
| 2737 | - htab->splt->output_section->vma |
| 2738 | - htab->splt->output_offset |
| 2739 | - 6), |
| 2740 | htab->splt->contents + 2); |
| 2741 | /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to |
| 2742 | the end of the instruction. */ |
| 2743 | bfd_put_32 (output_bfd, |
| 2744 | (htab->sgotplt->output_section->vma |
| 2745 | + htab->sgotplt->output_offset |
| 2746 | + 16 |
| 2747 | - htab->splt->output_section->vma |
| 2748 | - htab->splt->output_offset |
| 2749 | - 12), |
| 2750 | htab->splt->contents + 8); |
| 2751 | |
| 2752 | elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize = |
| 2753 | PLT_ENTRY_SIZE; |
| 2754 | } |
| 2755 | } |
| 2756 | |
| 2757 | if (htab->sgotplt) |
| 2758 | { |
| 2759 | /* Fill in the first three entries in the global offset table. */ |
| 2760 | if (htab->sgotplt->_raw_size > 0) |
| 2761 | { |
| 2762 | /* Set the first entry in the global offset table to the address of |
| 2763 | the dynamic section. */ |
| 2764 | if (sdyn == NULL) |
| 2765 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents); |
| 2766 | else |
| 2767 | bfd_put_64 (output_bfd, |
| 2768 | sdyn->output_section->vma + sdyn->output_offset, |
| 2769 | htab->sgotplt->contents); |
| 2770 | /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ |
| 2771 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE); |
| 2772 | bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2); |
| 2773 | } |
| 2774 | |
| 2775 | elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = |
| 2776 | GOT_ENTRY_SIZE; |
| 2777 | } |
| 2778 | |
| 2779 | return TRUE; |
| 2780 | } |
| 2781 | |
| 2782 | |
| 2783 | #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec |
| 2784 | #define TARGET_LITTLE_NAME "elf64-x86-64" |
| 2785 | #define ELF_ARCH bfd_arch_i386 |
| 2786 | #define ELF_MACHINE_CODE EM_X86_64 |
| 2787 | #define ELF_MAXPAGESIZE 0x100000 |
| 2788 | |
| 2789 | #define elf_backend_can_gc_sections 1 |
| 2790 | #define elf_backend_can_refcount 1 |
| 2791 | #define elf_backend_want_got_plt 1 |
| 2792 | #define elf_backend_plt_readonly 1 |
| 2793 | #define elf_backend_want_plt_sym 0 |
| 2794 | #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3) |
| 2795 | #define elf_backend_rela_normal 1 |
| 2796 | |
| 2797 | #define elf_info_to_howto elf64_x86_64_info_to_howto |
| 2798 | |
| 2799 | #define bfd_elf64_bfd_link_hash_table_create \ |
| 2800 | elf64_x86_64_link_hash_table_create |
| 2801 | #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup |
| 2802 | |
| 2803 | #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol |
| 2804 | #define elf_backend_check_relocs elf64_x86_64_check_relocs |
| 2805 | #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol |
| 2806 | #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections |
| 2807 | #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections |
| 2808 | #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol |
| 2809 | #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook |
| 2810 | #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook |
| 2811 | #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus |
| 2812 | #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo |
| 2813 | #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class |
| 2814 | #define elf_backend_relocate_section elf64_x86_64_relocate_section |
| 2815 | #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections |
| 2816 | #define elf_backend_object_p elf64_x86_64_elf_object_p |
| 2817 | #define bfd_elf64_mkobject elf64_x86_64_mkobject |
| 2818 | |
| 2819 | #include "elf64-target.h" |