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2001-04-18 Martin M. Hunt <hunt@redhat.com>
[deliverable/binutils-gdb.git] / bfd / elf64-x86-64.c
CommitLineData
8d88c4ca 1/* X86-64 specific support for 64-bit ELF
70256ad8 2 Copyright 2000, 2001 Free Software Foundation, Inc.
8d88c4ca
NC		 3 Contributed by Jan Hubicka <jh@suse.cz>.
4
5This file is part of BFD, the Binary File Descriptor library.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21#include "bfd.h"
22#include "sysdep.h"
23#include "libbfd.h"
24#include "elf-bfd.h"
25
26#include "elf/x86-64.h"
27
28/* We use only the RELA entries. */
29#define USE_RELA
30
31/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
32#define MINUS_ONE (~ (bfd_vma) 0)
33
34/* The relocation "howto" table. Order of fields:
407443a3
AJ		 35 type, size, bitsize, pc_relative, complain_on_overflow,
36 special_function, name, partial_inplace, src_mask, dst_pack, pcrel_offset. */
70256ad8
AJ		 37static reloc_howto_type x86_64_elf_howto_table[] =
38{
407443a3
AJ		 39 HOWTO(R_X86_64_NONE, 0, 0, 0, false, 0, complain_overflow_dont,
40 bfd_elf_generic_reloc, "R_X86_64_NONE", false, 0x00000000, 0x00000000, false),
41 HOWTO(R_X86_64_64, 0, 4, 64, false, 0, complain_overflow_bitfield,
42 bfd_elf_generic_reloc, "R_X86_64_64", false, MINUS_ONE, MINUS_ONE, false),
43 HOWTO(R_X86_64_PC32, 0, 4, 32, true, 0, complain_overflow_signed,
44 bfd_elf_generic_reloc, "R_X86_64_PC32", false, 0xffffffff, 0xffffffff, true),
45 HOWTO(R_X86_64_GOT32, 0, 4, 32, false, 0, complain_overflow_signed,
46 bfd_elf_generic_reloc, "R_X86_64_GOT32", false, 0xffffffff, 0xffffffff, false),
47 HOWTO(R_X86_64_PLT32, 0, 4, 32, true, 0, complain_overflow_signed,
48 bfd_elf_generic_reloc, "R_X86_64_PLT32", false, 0xffffffff, 0xffffffff, true),
49 HOWTO(R_X86_64_COPY, 0, 4, 32, false, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_X86_64_COPY", false, 0xffffffff, 0xffffffff, false),
51 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, false, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", false, MINUS_ONE, MINUS_ONE, false),
407443a3
AJ		 53 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, false, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", false, MINUS_ONE, MINUS_ONE, false),
4a73f21b
AJ		 55 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, false, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", false, MINUS_ONE, MINUS_ONE, false),
407443a3
AJ		 57 HOWTO(R_X86_64_GOTPCREL, 0, 4, 32, true,0 , complain_overflow_signed,
58 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", false, 0xffffffff, 0xffffffff, true),
59 HOWTO(R_X86_64_32, 0, 4, 32, false, 0, complain_overflow_unsigned,
60 bfd_elf_generic_reloc, "R_X86_64_32", false, 0xffffffff, 0xffffffff, false),
61 HOWTO(R_X86_64_32S, 0, 4, 32, false, 0, complain_overflow_signed,
62 bfd_elf_generic_reloc, "R_X86_64_32S", false, 0xffffffff, 0xffffffff, false),
63 HOWTO(R_X86_64_16, 0, 1, 16, false, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_X86_64_16", false, 0xffff, 0xffff, false),
65 HOWTO(R_X86_64_PC16,0, 1, 16, true, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_X86_64_PC16", false, 0xffff, 0xffff, true),
67 HOWTO(R_X86_64_8, 0, 0, 8, false, 0, complain_overflow_signed,
68 bfd_elf_generic_reloc, "R_X86_64_8", false, 0xff, 0xff, false),
69 HOWTO(R_X86_64_PC8, 0, 0, 8, true, 0, complain_overflow_signed,
70 bfd_elf_generic_reloc, "R_X86_64_PC8", false, 0xff, 0xff, true)
8d88c4ca
NC		 71};
72
73/* Map BFD relocs to the x86_64 elf relocs. */
70256ad8
AJ		 74struct elf_reloc_map
75{
8d88c4ca
NC		 76 bfd_reloc_code_real_type bfd_reloc_val;
77 unsigned char elf_reloc_val;
78};
79
80static CONST struct elf_reloc_map x86_64_reloc_map[] =
81{
70256ad8
AJ		 82 { BFD_RELOC_NONE, R_X86_64_NONE, },
83 { BFD_RELOC_64, R_X86_64_64, },
84 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
85 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
86 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
87 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
88 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
89 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
90 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
91 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
92 { BFD_RELOC_32, R_X86_64_32, },
93 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
94 { BFD_RELOC_16, R_X86_64_16, },
95 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
96 { BFD_RELOC_8, R_X86_64_8, },
97 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
8d88c4ca
NC		 98};
99
8d88c4ca
NC		 100static reloc_howto_type *elf64_x86_64_reloc_type_lookup
101 PARAMS ((bfd *, bfd_reloc_code_real_type));
102static void elf64_x86_64_info_to_howto
103 PARAMS ((bfd *, arelent *, Elf64_Internal_Rela *));
104static struct bfd_link_hash_table *elf64_x86_64_link_hash_table_create
105 PARAMS ((bfd *));
70256ad8
AJ		 106
107static struct bfd_hash_entry *elf64_x86_64_link_hash_newfunc
108 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
109static boolean elf64_x86_64_adjust_dynamic_symbol
110 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
111
112static boolean elf64_x86_64_size_dynamic_sections
113 PARAMS ((bfd *, struct bfd_link_info *));
8d88c4ca
NC		 114static boolean elf64_x86_64_relocate_section
115 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
407443a3 116 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
70256ad8
AJ		 117static boolean elf64_x86_64_finish_dynamic_symbol
118 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
119 Elf_Internal_Sym *sym));
120static boolean elf64_x86_64_finish_dynamic_sections
121 PARAMS ((bfd *, struct bfd_link_info *));
8d88c4ca
NC		 122
123/* Given a BFD reloc type, return a HOWTO structure. */
124static reloc_howto_type *
125elf64_x86_64_reloc_type_lookup (abfd, code)
126 bfd *abfd ATTRIBUTE_UNUSED;
127 bfd_reloc_code_real_type code;
128{
129 unsigned int i;
130 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
131 i++)
132 {
133 if (x86_64_reloc_map[i].bfd_reloc_val == code)
8da6118f
KH		 134 return &x86_64_elf_howto_table[(int)
135 x86_64_reloc_map[i].elf_reloc_val];
8d88c4ca
NC		 136 }
137 return 0;
138}
139
8d88c4ca 140/* Given an x86_64 ELF reloc type, fill in an arelent structure. */
8da6118f 141
8d88c4ca
NC		 142static void
143elf64_x86_64_info_to_howto (abfd, cache_ptr, dst)
144 bfd *abfd ATTRIBUTE_UNUSED;
145 arelent *cache_ptr;
146 Elf64_Internal_Rela *dst;
147{
148 unsigned r_type;
149
150 r_type = ELF64_R_TYPE (dst->r_info);
151 BFD_ASSERT (r_type < (unsigned int) R_X86_64_max);
152 cache_ptr->howto = &x86_64_elf_howto_table[r_type];
153 BFD_ASSERT (r_type == cache_ptr->howto->type);
154}
70256ad8 155\f
407443a3 156/* Functions for the x86-64 ELF linker. */
70256ad8 157
407443a3 158/* The name of the dynamic interpreter. This is put in the .interp
70256ad8
AJ		 159 section. */
160
407443a3 161#define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
70256ad8
AJ		 162
163/* The size in bytes of an entry in the global offset table. */
164
165#define GOT_ENTRY_SIZE 8
8d88c4ca 166
70256ad8 167/* The size in bytes of an entry in the procedure linkage table. */
8d88c4ca 168
70256ad8
AJ		 169#define PLT_ENTRY_SIZE 16
170
171/* The first entry in a procedure linkage table looks like this. See the
172 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
173
174static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
175{
176 0xff, 0xb3, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
177 0xff, 0xa3, 16, 0, 0, 0, /* jmp GOT+16(%rip) */
407443a3 178 0, 0, 0, 0 /* pad out to 16 bytes. */
70256ad8
AJ		 179};
180
181/* Subsequent entries in a procedure linkage table look like this. */
182
183static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
184{
185 0xff, 0xa3, /* jmp *name@GOTPC(%rip) */
407443a3 186 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
70256ad8
AJ		 187 0x68, /* pushq immediate */
188 0, 0, 0, 0, /* replaced with index into relocation table. */
189 0xe9, /* jmp relative */
190 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
191};
192
193/* The x86-64 linker needs to keep track of the number of relocs that
407443a3 194 it decides to copy in check_relocs for each symbol. This is so
70256ad8
AJ		 195 that it can discard PC relative relocs if it doesn't need them when
196 linking with -Bsymbolic. We store the information in a field
407443a3 197 extending the regular ELF linker hash table. */
70256ad8
AJ		 198
199/* This structure keeps track of the number of PC relative relocs we
200 have copied for a given symbol. */
201
202struct elf64_x86_64_pcrel_relocs_copied
203{
204 /* Next section. */
205 struct elf64_x86_64_pcrel_relocs_copied *next;
206 /* A section in dynobj. */
207 asection *section;
208 /* Number of relocs copied in this section. */
209 bfd_size_type count;
210};
211
212/* x86-64 ELF linker hash entry. */
213
214struct elf64_x86_64_link_hash_entry
215{
216 struct elf_link_hash_entry root;
217
218 /* Number of PC relative relocs copied for this symbol. */
219 struct elf64_x86_64_pcrel_relocs_copied *pcrel_relocs_copied;
220};
221
222/* x86-64 ELF linker hash table. */
8d88c4ca 223
407443a3
AJ		 224struct elf64_x86_64_link_hash_table
225{
8d88c4ca
NC		 226 struct elf_link_hash_table root;
227};
228
70256ad8
AJ		 229/* Declare this now that the above structures are defined. */
230
231static boolean elf64_x86_64_discard_copies
232 PARAMS ((struct elf64_x86_64_link_hash_entry *, PTR));
233
234/* Traverse an x86-64 ELF linker hash table. */
235
236#define elf64_x86_64_link_hash_traverse(table, func, info) \
237 (elf_link_hash_traverse \
238 (&(table)->root, \
239 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
240 (info)))
241
242/* Get the x86-64 ELF linker hash table from a link_info structure. */
8d88c4ca
NC		 243
244#define elf64_x86_64_hash_table(p) \
245 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
246
407443a3 247/* Create an entry in an x86-64 ELF linker hash table. */
70256ad8
AJ		 248
249static struct bfd_hash_entry *
250elf64_x86_64_link_hash_newfunc (entry, table, string)
251 struct bfd_hash_entry *entry;
252 struct bfd_hash_table *table;
253 const char *string;
254{
255 struct elf64_x86_64_link_hash_entry *ret =
256 (struct elf64_x86_64_link_hash_entry *) entry;
257
258 /* Allocate the structure if it has not already been allocated by a
407443a3 259 subclass. */
70256ad8
AJ		 260 if (ret == (struct elf64_x86_64_link_hash_entry *) NULL)
261 ret = ((struct elf64_x86_64_link_hash_entry *)
262 bfd_hash_allocate (table,
263 sizeof (struct elf64_x86_64_link_hash_entry)));
264 if (ret == (struct elf64_x86_64_link_hash_entry *) NULL)
265 return (struct bfd_hash_entry *) ret;
266
267 /* Call the allocation method of the superclass. */
268 ret = ((struct elf64_x86_64_link_hash_entry *)
269 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
270 table, string));
271 if (ret != (struct elf64_x86_64_link_hash_entry *) NULL)
272 {
273 ret->pcrel_relocs_copied = NULL;
274 }
275
276 return (struct bfd_hash_entry *) ret;
277}
278
8d88c4ca
NC		 279/* Create an X86-64 ELF linker hash table. */
280
281static struct bfd_link_hash_table *
282elf64_x86_64_link_hash_table_create (abfd)
283 bfd *abfd;
284{
285 struct elf64_x86_64_link_hash_table *ret;
286
287 ret = ((struct elf64_x86_64_link_hash_table *)
8da6118f 288 bfd_alloc (abfd, sizeof (struct elf64_x86_64_link_hash_table)));
8d88c4ca
NC		 289 if (ret == (struct elf64_x86_64_link_hash_table *) NULL)
290 return NULL;
291
292 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
70256ad8 293 elf64_x86_64_link_hash_newfunc))
8d88c4ca
NC		 294 {
295 bfd_release (abfd, ret);
296 return NULL;
297 }
298
299 return &ret->root.root;
300}
301
302boolean
303elf64_x86_64_elf_object_p (abfd)
304 bfd *abfd;
305{
306 /* Set the right machine number for an x86-64 elf64 file. */
307 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
308 return true;
309}
310
70256ad8
AJ		 311/* Look through the relocs for a section during the first phase, and
312 allocate space in the global offset table or procedure linkage
313 table. */
314
315static boolean
316elf64_x86_64_check_relocs (abfd, info, sec, relocs)
317 bfd *abfd;
318 struct bfd_link_info *info;
319 asection *sec;
320 const Elf_Internal_Rela *relocs;
321{
322 bfd *dynobj;
323 Elf_Internal_Shdr *symtab_hdr;
324 struct elf_link_hash_entry **sym_hashes;
325 bfd_signed_vma *local_got_refcounts;
326 const Elf_Internal_Rela *rel;
327 const Elf_Internal_Rela *rel_end;
328 asection *sgot;
329 asection *srelgot;
330 asection *sreloc;
331
332 if (info->relocateable)
333 return true;
334
335 dynobj = elf_hash_table (info)->dynobj;
336 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
337 sym_hashes = elf_sym_hashes (abfd);
338 local_got_refcounts = elf_local_got_refcounts (abfd);
339
340 sgot = srelgot = sreloc = NULL;
341 rel_end = relocs + sec->reloc_count;
342 for (rel = relocs; rel < rel_end; rel++)
343 {
344 unsigned long r_symndx;
345 struct elf_link_hash_entry *h;
346
347 r_symndx = ELF64_R_SYM (rel->r_info);
348 if (r_symndx < symtab_hdr->sh_info)
349 h = NULL;
350 else
351 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
352
353 /* Some relocs require a global offset table. */
354 if (dynobj == NULL)
355 {
356 switch (ELF64_R_TYPE (rel->r_info))
357 {
358 case R_X86_64_GOT32:
359 case R_X86_64_GOTPCREL:
360 elf_hash_table (info)->dynobj = dynobj = abfd;
361 if (! _bfd_elf_create_got_section (dynobj, info))
362 return false;
363 break;
364 }
365 }
366
367 switch (ELF64_R_TYPE (rel->r_info))
368 {
51e0a107 369 case R_X86_64_GOTPCREL:
70256ad8 370 case R_X86_64_GOT32:
407443a3 371 /* This symbol requires a global offset table entry. */
70256ad8
AJ		 372
373 if (sgot == NULL)
374 {
375 sgot = bfd_get_section_by_name (dynobj, ".got");
376 BFD_ASSERT (sgot != NULL);
377 }
378
379 if (srelgot == NULL && (h != NULL || info->shared))
380 {
381 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
382 if (srelgot == NULL)
383 {
384 srelgot = bfd_make_section (dynobj, ".rela.got");
385 if (srelgot == NULL
386 || ! bfd_set_section_flags (dynobj, srelgot,
387 (SEC_ALLOC
388 | SEC_LOAD
389 | SEC_HAS_CONTENTS
390 | SEC_IN_MEMORY
391 | SEC_LINKER_CREATED
392 | SEC_READONLY))
51e0a107 393 || ! bfd_set_section_alignment (dynobj, srelgot, 3))
70256ad8
AJ		 394 return false;
395 }
396 }
397
398 if (h != NULL)
399 {
400 if (h->got.refcount == -1)
401 {
402 h->got.refcount = 1;
403
404 /* Make sure this symbol is output as a dynamic symbol. */
405 if (h->dynindx == -1)
406 {
407 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
408 return false;
409 }
410
411 sgot->_raw_size += GOT_ENTRY_SIZE;
412 srelgot->_raw_size += sizeof (Elf64_External_Rela);
413 }
414 else
415 h->got.refcount += 1;
416 }
417 else
418 {
419 /* This is a global offset table entry for a local symbol. */
420 if (local_got_refcounts == NULL)
421 {
422 size_t size;
423
424 size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
425 local_got_refcounts = ((bfd_signed_vma *)
426 bfd_alloc (abfd, size));
427 if (local_got_refcounts == NULL)
428 return false;
429 elf_local_got_refcounts (abfd) = local_got_refcounts;
430 memset (local_got_refcounts, -1, size);
431 }
432 if (local_got_refcounts[r_symndx] == -1)
433 {
434 local_got_refcounts[r_symndx] = 1;
435
436 sgot->_raw_size += GOT_ENTRY_SIZE;
437 if (info->shared)
438 {
439 /* If we are generating a shared object, we need to
440 output a R_X86_64_RELATIVE reloc so that the dynamic
441 linker can adjust this GOT entry. */
442 srelgot->_raw_size += sizeof (Elf64_External_Rela);
443 }
444 }
445 else
446 local_got_refcounts[r_symndx] += 1;
447 }
448 break;
449
450 case R_X86_64_PLT32:
451 /* This symbol requires a procedure linkage table entry. We
407443a3
AJ		 452 actually build the entry in adjust_dynamic_symbol,
453 because this might be a case of linking PIC code which is
454 never referenced by a dynamic object, in which case we
455 don't need to generate a procedure linkage table entry
456 after all. */
70256ad8
AJ		 457
458 /* If this is a local symbol, we resolve it directly without
407443a3 459 creating a procedure linkage table entry. */
70256ad8
AJ		 460 if (h == NULL)
461 continue;
462
463 if (h->plt.refcount == -1)
464 {
465 h->plt.refcount = 1;
466 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
467 }
468 else
469 h->plt.refcount += 1;
470 break;
471
472 case R_X86_64_32:
473 case R_X86_64_32S:
474 case R_X86_64_PC32:
475 if (h != NULL)
476 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
477
478 /* If we are creating a shared library, and this is a reloc
479 against a global symbol, or a non PC relative reloc
480 against a local symbol, then we need to copy the reloc
481 into the shared library. However, if we are linking with
482 -Bsymbolic, we do not need to copy a reloc against a
483 global symbol which is defined in an object we are
407443a3 484 including in the link (i.e., DEF_REGULAR is set). At
70256ad8
AJ		 485 this point we have not seen all the input files, so it is
486 possible that DEF_REGULAR is not set now but will be set
487 later (it is never cleared). We account for that
488 possibility below by storing information in the
489 pcrel_relocs_copied field of the hash table entry.
490 A similar situation occurs when creating shared libraries
491 and symbol visibility changes render the symbol local. */
492 if (info->shared
493 && (sec->flags & SEC_ALLOC) != 0
494 && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC32
495 || (h != NULL
496 && (! info->symbolic
497 || (h->elf_link_hash_flags
498 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
499 {
500 /* When creating a shared object, we must copy these
501 reloc types into the output file. We create a reloc
502 section in dynobj and make room for this reloc. */
503 if (sreloc == NULL)
504 {
505 const char *name;
506
507 name = (bfd_elf_string_from_elf_section
508 (abfd,
509 elf_elfheader (abfd)->e_shstrndx,
510 elf_section_data (sec)->rel_hdr.sh_name));
511 if (name == NULL)
512 return false;
513
514 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
515 && strcmp (bfd_get_section_name (abfd, sec),
516 name + 5) == 0);
517
518 sreloc = bfd_get_section_by_name (dynobj, name);
519 if (sreloc == NULL)
520 {
521 flagword flags;
522
523 sreloc = bfd_make_section (dynobj, name);
524 flags = (SEC_HAS_CONTENTS | SEC_READONLY
525 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
526 if ((sec->flags & SEC_ALLOC) != 0)
527 flags |= SEC_ALLOC | SEC_LOAD;
528 if (sreloc == NULL
529 || ! bfd_set_section_flags (dynobj, sreloc, flags)
530 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
531 return false;
532 }
533 }
534
535 sreloc->_raw_size += sizeof (Elf64_External_Rela);
536
537 /* If this is a global symbol, we count the number of PC
538 relative relocations we have entered for this symbol,
539 so that we can discard them later as necessary. Note
540 that this function is only called if we are using an
541 elf64_x86_64 linker hash table, which means that h is
542 really a pointer to an elf64_x86_64_link_hash_entry. */
543 if (h != NULL
544 && ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32)
545 {
546 struct elf64_x86_64_link_hash_entry *eh;
547 struct elf64_x86_64_pcrel_relocs_copied *p;
548
549 eh = (struct elf64_x86_64_link_hash_entry *) h;
550
551 for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
552 if (p->section == sreloc)
553 break;
554
555 if (p == NULL)
556 {
557 p = ((struct elf64_x86_64_pcrel_relocs_copied *)
558 bfd_alloc (dynobj, sizeof *p));
559 if (p == NULL)
560 return false;
561 p->next = eh->pcrel_relocs_copied;
562 eh->pcrel_relocs_copied = p;
563 p->section = sreloc;
564 p->count = 0;
565 }
566
567 ++p->count;
568 }
569 }
570 break;
571 }
572 }
573
574 return true;
575}
576
577/* Return the section that should be marked against GC for a given
407443a3 578 relocation. */
70256ad8
AJ		 579
580static asection *
581elf64_x86_64_gc_mark_hook (abfd, info, rel, h, sym)
582 bfd *abfd;
583 struct bfd_link_info *info ATTRIBUTE_UNUSED;
584 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED;
585 struct elf_link_hash_entry *h;
586 Elf_Internal_Sym *sym;
587{
588 if (h != NULL)
589 {
590 switch (h->root.type)
591 {
592 case bfd_link_hash_defined:
593 case bfd_link_hash_defweak:
594 return h->root.u.def.section;
595
596 case bfd_link_hash_common:
597 return h->root.u.c.p->section;
598
599 default:
600 break;
601 }
602 }
603 else
604 {
605 if (!(elf_bad_symtab (abfd)
606 && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
607 && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
608 && sym->st_shndx != SHN_COMMON))
609 {
610 return bfd_section_from_elf_index (abfd, sym->st_shndx);
611 }
612 }
613
614 return NULL;
615}
616
407443a3 617/* Update the got entry reference counts for the section being removed. */
70256ad8
AJ		 618
619static boolean
620elf64_x86_64_gc_sweep_hook (abfd, info, sec, relocs)
621 bfd *abfd;
622 struct bfd_link_info *info ATTRIBUTE_UNUSED;
623 asection *sec;
624 const Elf_Internal_Rela *relocs;
625{
626 Elf_Internal_Shdr *symtab_hdr;
627 struct elf_link_hash_entry **sym_hashes;
628 bfd_signed_vma *local_got_refcounts;
629 const Elf_Internal_Rela *rel, *relend;
630 unsigned long r_symndx;
631 struct elf_link_hash_entry *h;
632 bfd *dynobj;
633 asection *sgot;
634 asection *srelgot;
635
636 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
637 sym_hashes = elf_sym_hashes (abfd);
638 local_got_refcounts = elf_local_got_refcounts (abfd);
639
640 dynobj = elf_hash_table (info)->dynobj;
641 if (dynobj == NULL)
642 return true;
643
644 sgot = bfd_get_section_by_name (dynobj, ".got");
645 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
646
647 relend = relocs + sec->reloc_count;
648 for (rel = relocs; rel < relend; rel++)
649 switch (ELF64_R_TYPE (rel->r_info))
650 {
651 case R_X86_64_GOT32:
652 case R_X86_64_GOTPCREL:
653 r_symndx = ELF64_R_SYM (rel->r_info);
654 if (r_symndx >= symtab_hdr->sh_info)
655 {
656 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
657 if (h->got.refcount > 0)
658 {
659 h->got.refcount -= 1;
660 if (h->got.refcount == 0)
661 {
662 sgot->_raw_size -= GOT_ENTRY_SIZE;
663 srelgot->_raw_size -= sizeof (Elf64_External_Rela);
664 }
665 }
666 }
667 else if (local_got_refcounts != NULL)
668 {
669 if (local_got_refcounts[r_symndx] > 0)
670 {
671 local_got_refcounts[r_symndx] -= 1;
672 if (local_got_refcounts[r_symndx] == 0)
673 {
674 sgot->_raw_size -= GOT_ENTRY_SIZE;
675 if (info->shared)
676 srelgot->_raw_size -= sizeof (Elf64_External_Rela);
677 }
678 }
679 }
680 break;
681
682 case R_X86_64_PLT32:
683 r_symndx = ELF64_R_SYM (rel->r_info);
684 if (r_symndx >= symtab_hdr->sh_info)
685 {
686 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
687 if (h->plt.refcount > 0)
688 h->plt.refcount -= 1;
689 }
690 break;
691
692 default:
693 break;
694 }
695
696 return true;
697}
698
699/* Adjust a symbol defined by a dynamic object and referenced by a
700 regular object. The current definition is in some section of the
701 dynamic object, but we're not including those sections. We have to
702 change the definition to something the rest of the link can
407443a3 703 understand. */
70256ad8
AJ		 704
705static boolean
706elf64_x86_64_adjust_dynamic_symbol (info, h)
707 struct bfd_link_info *info;
708 struct elf_link_hash_entry *h;
709{
710 bfd *dynobj;
711 asection *s;
712 unsigned int power_of_two;
713
714 dynobj = elf_hash_table (info)->dynobj;
715
716 /* Make sure we know what is going on here. */
717 BFD_ASSERT (dynobj != NULL
718 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
719 || h->weakdef != NULL
720 || ((h->elf_link_hash_flags
721 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
722 && (h->elf_link_hash_flags
723 & ELF_LINK_HASH_REF_REGULAR) != 0
724 && (h->elf_link_hash_flags
725 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
726
727 /* If this is a function, put it in the procedure linkage table. We
728 will fill in the contents of the procedure linkage table later,
729 when we know the address of the .got section. */
730 if (h->type == STT_FUNC
731 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
732 {
407443a3
AJ		 733 if ((! info->shared
734 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
735 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)
736 || (info->shared && h->plt.refcount <= 0))
70256ad8 737 {
70256ad8
AJ		 738 /* This case can occur if we saw a PLT32 reloc in an input
739 file, but the symbol was never referred to by a dynamic
740 object, or if all references were garbage collected. In
741 such a case, we don't actually need to build a procedure
742 linkage table, and we can just do a PC32 reloc instead. */
70256ad8
AJ		 743 h->plt.offset = (bfd_vma) -1;
744 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
745 return true;
746 }
747
748 /* Make sure this symbol is output as a dynamic symbol. */
749 if (h->dynindx == -1)
750 {
751 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
752 return false;
753 }
754
755 s = bfd_get_section_by_name (dynobj, ".plt");
756 BFD_ASSERT (s != NULL);
757
758 /* If this is the first .plt entry, make room for the special
759 first entry. */
760 if (s->_raw_size == 0)
761 s->_raw_size = PLT_ENTRY_SIZE;
762
763 /* If this symbol is not defined in a regular file, and we are
764 not generating a shared library, then set the symbol to this
407443a3 765 location in the .plt. This is required to make function
70256ad8
AJ		 766 pointers compare as equal between the normal executable and
767 the shared library. */
768 if (! info->shared
769 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
770 {
771 h->root.u.def.section = s;
772 h->root.u.def.value = s->_raw_size;
773 }
774
775 h->plt.offset = s->_raw_size;
776
777 /* Make room for this entry. */
778 s->_raw_size += PLT_ENTRY_SIZE;
779
407443a3
AJ		 780 /* We also need to make an entry in the .got.plt section, which
781 will be placed in the .got section by the linker script. */
782 s = bfd_get_section_by_name (dynobj, ".got.plt");
783 BFD_ASSERT (s != NULL);
784 s->_raw_size += GOT_ENTRY_SIZE;
785
70256ad8
AJ		 786 /* We also need to make an entry in the .rela.plt section. */
787 s = bfd_get_section_by_name (dynobj, ".rela.plt");
788 BFD_ASSERT (s != NULL);
789 s->_raw_size += sizeof (Elf64_External_Rela);
790
791 return true;
792 }
793
794 /* If this is a weak symbol, and there is a real definition, the
795 processor independent code will have arranged for us to see the
407443a3 796 real definition first, and we can just use the same value. */
70256ad8
AJ		 797 if (h->weakdef != NULL)
798 {
799 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
800 || h->weakdef->root.type == bfd_link_hash_defweak);
801 h->root.u.def.section = h->weakdef->root.u.def.section;
802 h->root.u.def.value = h->weakdef->root.u.def.value;
803 return true;
804 }
805
806 /* This is a reference to a symbol defined by a dynamic object which
407443a3 807 is not a function. */
70256ad8
AJ		 808
809 /* If we are creating a shared library, we must presume that the
810 only references to the symbol are via the global offset table.
811 For such cases we need not do anything here; the relocations will
407443a3 812 be handled correctly by relocate_section. */
70256ad8
AJ		 813 if (info->shared)
814 return true;
815
816 /* If there are no references to this symbol that do not use the
817 GOT, we don't need to generate a copy reloc. */
818 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
819 return true;
820
821 /* We must allocate the symbol in our .dynbss section, which will
407443a3 822 become part of the .bss section of the executable. There will be
70256ad8
AJ		 823 an entry for this symbol in the .dynsym section. The dynamic
824 object will contain position independent code, so all references
825 from the dynamic object to this symbol will go through the global
826 offset table. The dynamic linker will use the .dynsym entry to
827 determine the address it must put in the global offset table, so
828 both the dynamic object and the regular object will refer to the
829 same memory location for the variable. */
830
831 s = bfd_get_section_by_name (dynobj, ".dynbss");
832 BFD_ASSERT (s != NULL);
833
834 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
835 to copy the initial value out of the dynamic object and into the
836 runtime process image. We need to remember the offset into the
837 .rela.bss section we are going to use. */
838 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
839 {
840 asection *srel;
841
842 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
843 BFD_ASSERT (srel != NULL);
844 srel->_raw_size += sizeof (Elf64_External_Rela);
845 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
846 }
847
848 /* We need to figure out the alignment required for this symbol. I
407443a3 849 have no idea how ELF linkers handle this. 16-bytes is the size
70256ad8
AJ		 850 of the largest type that requires hard alignment -- long double. */
851 /* FIXME: This is VERY ugly. Should be fixed for all architectures using
852 this construct. */
853 power_of_two = bfd_log2 (h->size);
854 if (power_of_two > 4)
855 power_of_two = 4;
856
857 /* Apply the required alignment. */
858 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
859 if (power_of_two > bfd_get_section_alignment (dynobj, s))
860 {
861 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
862 return false;
863 }
864
865 /* Define the symbol as being at this point in the section. */
866 h->root.u.def.section = s;
867 h->root.u.def.value = s->_raw_size;
868
869 /* Increment the section size to make room for the symbol. */
870 s->_raw_size += h->size;
871
872 return true;
873}
874
875/* Set the sizes of the dynamic sections. */
876
877static boolean
878elf64_x86_64_size_dynamic_sections (output_bfd, info)
879 bfd *output_bfd;
880 struct bfd_link_info *info;
881{
882 bfd *dynobj;
883 asection *s;
884 boolean plt;
885 boolean relocs;
886 boolean reltext;
887
888 dynobj = elf_hash_table (info)->dynobj;
889 BFD_ASSERT (dynobj != NULL);
890
891 if (elf_hash_table (info)->dynamic_sections_created)
892 {
893 /* Set the contents of the .interp section to the interpreter. */
894 if (! info->shared)
895 {
896 s = bfd_get_section_by_name (dynobj, ".interp");
897 BFD_ASSERT (s != NULL);
898 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
899 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
900 }
901 }
902 else
903 {
904 /* We may have created entries in the .rela.got section.
407443a3
AJ		 905 However, if we are not creating the dynamic sections, we will
906 not actually use these entries. Reset the size of .rela.got,
907 which will cause it to get stripped from the output file
908 below. */
70256ad8
AJ		 909 s = bfd_get_section_by_name (dynobj, ".rela.got");
910 if (s != NULL)
911 s->_raw_size = 0;
912 }
913
914 /* If this is a -Bsymbolic shared link, then we need to discard all
915 PC relative relocs against symbols defined in a regular object.
916 We allocated space for them in the check_relocs routine, but we
917 will not fill them in in the relocate_section routine. */
918 if (info->shared)
919 elf64_x86_64_link_hash_traverse (elf64_x86_64_hash_table (info),
920 elf64_x86_64_discard_copies,
921 (PTR) info);
922
923 /* The check_relocs and adjust_dynamic_symbol entry points have
924 determined the sizes of the various dynamic sections. Allocate
925 memory for them. */
926 plt = relocs = reltext = false;
927 for (s = dynobj->sections; s != NULL; s = s->next)
928 {
929 const char *name;
930 boolean strip;
931
932 if ((s->flags & SEC_LINKER_CREATED) == 0)
933 continue;
934
935 /* It's OK to base decisions on the section name, because none
936 of the dynobj section names depend upon the input files. */
937 name = bfd_get_section_name (dynobj, s);
938
939 strip = false;
940 if (strcmp (name, ".plt") == 0)
941 {
942 if (s->_raw_size == 0)
943 {
944 /* Strip this section if we don't need it; see the
407443a3 945 comment below. */
70256ad8
AJ		 946 strip = true;
947 }
948 else
949 {
950 /* Remember whether there is a PLT. */
951 plt = true;
952 }
953 }
954 else if (strncmp (name, ".rela", 5) == 0)
955 {
956 if (s->_raw_size == 0)
957 {
958 /* If we don't need this section, strip it from the
959 output file. This is mostly to handle .rela.bss and
960 .rela.plt. We must create both sections in
961 create_dynamic_sections, because they must be created
962 before the linker maps input sections to output
963 sections. The linker does that before
964 adjust_dynamic_symbol is called, and it is that
965 function which decides whether anything needs to go
966 into these sections. */
967 strip = true;
968 }
969 else
970 {
971 asection *target;
972
973 /* Remember whether there are any reloc sections other
407443a3 974 than .rela.plt. */
70256ad8
AJ		 975 if (strcmp (name, ".rela.plt") != 0)
976 {
977 const char *outname;
978
979 relocs = true;
980
981 /* If this relocation section applies to a read only
982 section, then we probably need a DT_TEXTREL
983 entry. The entries in the .rela.plt section
984 really apply to the .got section, which we
985 created ourselves and so know is not readonly. */
986 outname = bfd_get_section_name (output_bfd,
987 s->output_section);
988 target = bfd_get_section_by_name (output_bfd, outname + 5);
989 if (target != NULL
990 && (target->flags & SEC_READONLY) != 0
991 && (target->flags & SEC_ALLOC) != 0)
992 reltext = true;
993 }
994
995 /* We use the reloc_count field as a counter if we need
996 to copy relocs into the output file. */
997 s->reloc_count = 0;
998 }
999 }
1000 else if (strncmp (name, ".got", 4) != 0)
1001 {
1002 /* It's not one of our sections, so don't allocate space. */
1003 continue;
1004 }
1005
1006 if (strip)
1007 {
1008 _bfd_strip_section_from_output (info, s);
1009 continue;
1010 }
1011
1012 /* Allocate memory for the section contents. We use bfd_zalloc
1013 here in case unused entries are not reclaimed before the
1014 section's contents are written out. This should not happen,
1015 but this way if it does, we get a R_X86_64_NONE reloc instead
1016 of garbage. */
1017 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
1018 if (s->contents == NULL && s->_raw_size != 0)
1019 return false;
1020 }
1021
1022 if (elf_hash_table (info)->dynamic_sections_created)
1023 {
1024 /* Add some entries to the .dynamic section. We fill in the
1025 values later, in elf64_x86_64_finish_dynamic_sections, but we
1026 must add the entries now so that we get the correct size for
407443a3 1027 the .dynamic section. The DT_DEBUG entry is filled in by the
70256ad8
AJ		 1028 dynamic linker and used by the debugger. */
1029 if (! info->shared)
1030 {
1031 if (! bfd_elf64_add_dynamic_entry (info, DT_DEBUG, 0))
1032 return false;
1033 }
1034
1035 if (plt)
1036 {
70256ad8
AJ		 1037 if (! bfd_elf64_add_dynamic_entry (info, DT_PLTGOT, 0)
1038 || ! bfd_elf64_add_dynamic_entry (info, DT_PLTRELSZ, 0)
407443a3 1039 || ! bfd_elf64_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
70256ad8
AJ		 1040 || ! bfd_elf64_add_dynamic_entry (info, DT_JMPREL, 0))
1041 return false;
1042 }
1043
1044 if (relocs)
1045 {
1046 if (! bfd_elf64_add_dynamic_entry (info, DT_RELA, 0)
1047 || ! bfd_elf64_add_dynamic_entry (info, DT_RELASZ, 0)
1048 || ! bfd_elf64_add_dynamic_entry (info, DT_RELAENT,
1049 sizeof (Elf64_External_Rela)))
1050 return false;
1051 }
1052
1053 if (reltext)
1054 {
1055 if (! bfd_elf64_add_dynamic_entry (info, DT_TEXTREL, 0))
1056 return false;
1057 info->flags |= DF_TEXTREL;
1058 }
1059 }
1060
1061 return true;
1062}
1063
1064/* This function is called via elf64_x86_64_link_hash_traverse if we are
1065 creating a shared object. In the -Bsymbolic case, it discards the
1066 space allocated to copy PC relative relocs against symbols which
1067 are defined in regular objects. For the normal non-symbolic case,
1068 we also discard space for relocs that have become local due to
1069 symbol visibility changes. We allocated space for them in the
1070 check_relocs routine, but we won't fill them in in the
1071 relocate_section routine. */
1072
1073static boolean
1074elf64_x86_64_discard_copies (h, inf)
1075 struct elf64_x86_64_link_hash_entry *h;
1076 PTR inf;
1077{
1078 struct elf64_x86_64_pcrel_relocs_copied *s;
1079 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1080
1081 /* If a symbol has been forced local or we have found a regular
1082 definition for the symbolic link case, then we won't be needing
1083 any relocs. */
1084 if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1085 && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1086 || info->symbolic))
1087 {
1088 for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
1089 s->section->_raw_size -= s->count * sizeof (Elf64_External_Rela);
1090 }
1091
1092 return true;
1093}
1094
8d88c4ca
NC		 1095/* Relocate an x86_64 ELF section. */
1096
1097static boolean
1098elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
407443a3 1099 contents, relocs, local_syms, local_sections)
8d88c4ca
NC		 1100 bfd *output_bfd;
1101 struct bfd_link_info *info;
1102 bfd *input_bfd;
1103 asection *input_section;
1104 bfd_byte *contents;
1105 Elf_Internal_Rela *relocs;
1106 Elf_Internal_Sym *local_syms;
1107 asection **local_sections;
1108{
1109 bfd *dynobj;
1110 Elf_Internal_Shdr *symtab_hdr;
1111 struct elf_link_hash_entry **sym_hashes;
1112 bfd_vma *local_got_offsets;
70256ad8
AJ		 1113 asection *sgot;
1114 asection *splt;
8d88c4ca 1115 asection *sreloc;
70256ad8 1116 Elf_Internal_Rela *rela;
8d88c4ca
NC		 1117 Elf_Internal_Rela *relend;
1118
1119 dynobj = elf_hash_table (info)->dynobj;
1120 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1121 sym_hashes = elf_sym_hashes (input_bfd);
1122 local_got_offsets = elf_local_got_offsets (input_bfd);
1123
70256ad8 1124 sreloc = splt = sgot = NULL;
8d88c4ca 1125 if (dynobj != NULL)
70256ad8
AJ		 1126 {
1127 splt = bfd_get_section_by_name (dynobj, ".plt");
1128 sgot = bfd_get_section_by_name (dynobj, ".got");
1129 }
8d88c4ca 1130
70256ad8 1131 rela = relocs;
8d88c4ca 1132 relend = relocs + input_section->reloc_count;
70256ad8 1133 for (; rela < relend; rela++)
8d88c4ca
NC		 1134 {
1135 int r_type;
1136 reloc_howto_type *howto;
1137 unsigned long r_symndx;
1138 struct elf_link_hash_entry *h;
1139 Elf_Internal_Sym *sym;
1140 asection *sec;
1141 bfd_vma relocation;
1142 bfd_reloc_status_type r;
1143 unsigned int indx;
1144
70256ad8 1145 r_type = ELF64_R_TYPE (rela->r_info);
8d88c4ca
NC		 1146
1147 if ((indx = (unsigned) r_type) >= R_X86_64_max)
8da6118f
KH		 1148 {
1149 bfd_set_error (bfd_error_bad_value);
1150 return false;
1151 }
8d88c4ca
NC		 1152 howto = x86_64_elf_howto_table + indx;
1153
70256ad8 1154 r_symndx = ELF64_R_SYM (rela->r_info);
8d88c4ca
NC		 1155
1156 if (info->relocateable)
8da6118f
KH		 1157 {
1158 /* This is a relocateable link. We don't have to change
1159 anything, unless the reloc is against a section symbol,
1160 in which case we have to adjust according to where the
1161 section symbol winds up in the output section. */
1162 if (r_symndx < symtab_hdr->sh_info)
1163 {
1164 sym = local_syms + r_symndx;
1165 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
1166 {
1167 sec = local_sections[r_symndx];
70256ad8 1168 rela->r_addend += sec->output_offset + sym->st_value;
8da6118f
KH		 1169 }
1170 }
1171
1172 continue;
1173 }
8d88c4ca 1174
407443a3 1175 /* This is a final link. */
8d88c4ca
NC		 1176 h = NULL;
1177 sym = NULL;
1178 sec = NULL;
1179 if (r_symndx < symtab_hdr->sh_info)
8da6118f
KH		 1180 {
1181 sym = local_syms + r_symndx;
1182 sec = local_sections[r_symndx];
1183 relocation = (sec->output_section->vma
1184 + sec->output_offset
1185 + sym->st_value);
1186 }
8d88c4ca 1187 else
8da6118f
KH		 1188 {
1189 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1190 while (h->root.type == bfd_link_hash_indirect
1191 || h->root.type == bfd_link_hash_warning)
1192 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1193 if (h->root.type == bfd_link_hash_defined
1194 || h->root.type == bfd_link_hash_defweak)
1195 {
1196 sec = h->root.u.def.section;
bcdd92f3
AJ		 1197 if (r_type == R_X86_64_GOTPCREL
1198 || (r_type = R_X86_64_PLT32
1199 && splt != NULL
1200 && h->plt.offset != (bfd_vma) -1)
1201 || (r_type = R_X86_64_GOT32
1202 && elf_hash_table (info)->dynamic_sections_created
1203 && (!info->shared
1204 || (! info->symbolic && h->dynindx != -1)
1205 || (h->elf_link_hash_flags
1206 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1207 || (info->shared
1208 && ((! info->symbolic && h->dynindx != -1)
1209 || (h->elf_link_hash_flags
1210 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1211 && ( r_type == R_X86_64_8 ||
1212 r_type == R_X86_64_16 ||
1213 r_type == R_X86_64_32 ||
1214 r_type == R_X86_64_64 ||
1215 r_type == R_X86_64_PC16 ||
1216 r_type == R_X86_64_PC32)
1217 && ((input_section->flags & SEC_ALLOC) != 0
1218 /* DWARF will emit R_X86_64_32 relocations in its
1219 sections against symbols defined externally
1220 in shared libraries. We can't do anything
1221 with them here. */
1222 || ((input_section->flags & SEC_DEBUGGING) != 0
1223 && (h->elf_link_hash_flags
1224 & ELF_LINK_HASH_DEF_DYNAMIC) != 0))))
1225 {
1226 /* In these cases, we don't need the relocation
1227 value. We check specially because in some
1228 obscure cases sec->output_section will be NULL. */
1229 relocation = 0;
1230 }
1231 else if (sec->output_section == NULL)
8da6118f
KH		 1232 {
1233 (*_bfd_error_handler)
1234 (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
1235 bfd_get_filename (input_bfd), h->root.root.string,
1236 bfd_get_section_name (input_bfd, input_section));
1237 relocation = 0;
1238 }
1239 else
1240 relocation = (h->root.u.def.value
1241 + sec->output_section->vma
1242 + sec->output_offset);
1243 }
1244 else if (h->root.type == bfd_link_hash_undefweak)
1245 relocation = 0;
70256ad8
AJ		 1246 else if (info->shared && !info->symbolic && !info->no_undefined
1247 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1248 relocation = 0;
8da6118f
KH		 1249 else
1250 {
1251 if (! ((*info->callbacks->undefined_symbol)
1252 (info, h->root.root.string, input_bfd,
70256ad8 1253 input_section, rela->r_offset,
8da6118f
KH		 1254 (!info->shared || info->no_undefined
1255 || ELF_ST_VISIBILITY (h->other)))))
1256 return false;
1257 relocation = 0;
1258 }
1259 }
70256ad8
AJ		 1260
1261 /* When generating a shared object, the relocations handled here are
1262 copied into the output file to be resolved at run time. */
1263 switch (r_type)
1264 {
1265 case R_X86_64_GOT32:
1266 /* Relocation is to the entry for this symbol in the global
1267 offset table. */
1268 BFD_ASSERT (sgot != NULL);
1269
1270 if (h != NULL)
1271 {
1272 bfd_vma off = h->got.offset;
1273 BFD_ASSERT (off != (bfd_vma) -1);
1274
1275 if (! elf_hash_table (info)->dynamic_sections_created
1276 || (info->shared
1277 && (info->symbolic || h->dynindx == -1)
1278 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1279 {
1280 /* This is actually a static link, or it is a -Bsymbolic
1281 link and the symbol is defined locally, or the symbol
407443a3 1282 was forced to be local because of a version file. We
70256ad8
AJ		 1283 must initialize this entry in the global offset table.
1284 Since the offset must always be a multiple of 8, we
1285 use the least significant bit to record whether we
1286 have initialized it already.
1287
1288 When doing a dynamic link, we create a .rela.got
407443a3
AJ		 1289 relocation entry to initialize the value. This is
1290 done in the finish_dynamic_symbol routine. */
70256ad8
AJ		 1291 if ((off & 1) != 0)
1292 off &= ~1;
1293 else
1294 {
1295 bfd_put_64 (output_bfd, relocation,
1296 sgot->contents + off);
1297 h->got.offset |= 1;
1298 }
1299 }
1300 relocation = sgot->output_offset + off;
1301 }
1302 else
1303 {
1304 bfd_vma off;
1305
1306 BFD_ASSERT (local_got_offsets != NULL
1307 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1308
1309 off = local_got_offsets[r_symndx];
1310
1311 /* The offset must always be a multiple of 8. We use
407443a3
AJ		 1312 the least significant bit to record whether we have
1313 already generated the necessary reloc. */
70256ad8
AJ		 1314 if ((off & 1) != 0)
1315 off &= ~1;
1316 else
1317 {
1318 bfd_put_64 (output_bfd, relocation, sgot->contents + off);
1319
51e0a107 1320 if (info->shared)
70256ad8
AJ		 1321 {
1322 asection *srelgot;
1323 Elf_Internal_Rela outrel;
1324
1325 /* We need to generate a R_X86_64_RELATIVE reloc
1326 for the dynamic linker. */
1327 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1328 BFD_ASSERT (srelgot != NULL);
1329
1330 outrel.r_offset = (sgot->output_section->vma
1331 + sgot->output_offset
1332 + off);
1333 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
1334 outrel.r_addend = relocation;
1335 bfd_elf64_swap_reloca_out (output_bfd, &outrel,
1336 (((Elf64_External_Rela *)
1337 srelgot->contents)
1338 + srelgot->reloc_count));
1339 ++srelgot->reloc_count;
1340 }
1341
1342 local_got_offsets[r_symndx] |= 1;
1343 }
1344
1345 relocation = sgot->output_offset + off;
1346 }
1347
1348 break;
1349
1350 case R_X86_64_GOTPCREL:
1351 /* Use global offset table as symbol value. */
1352
51e0a107
JH		 1353 BFD_ASSERT (sgot != NULL);
1354 if (h != NULL)
70256ad8 1355 {
51e0a107
JH		 1356 bfd_vma off = h->got.offset;
1357 BFD_ASSERT (off != (bfd_vma) -1);
1358
1359 if (! elf_hash_table (info)->dynamic_sections_created
1360 || (info->shared
1361 && (info->symbolic || h->dynindx == -1)
1362 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1363 {
1364 /* This is actually a static link, or it is a -Bsymbolic
1365 link and the symbol is defined locally, or the symbol
407443a3 1366 was forced to be local because of a version file. We
51e0a107
JH		 1367 must initialize this entry in the global offset table.
1368 Since the offset must always be a multiple of 8, we
1369 use the least significant bit to record whether we
1370 have initialized it already.
1371
1372 When doing a dynamic link, we create a .rela.got
407443a3
AJ		 1373 relocation entry to initialize the value. This is
1374 done in the finish_dynamic_symbol routine. */
51e0a107
JH		 1375 if ((off & 1) != 0)
1376 off &= ~1;
1377 else
1378 {
1379 bfd_put_64 (output_bfd, relocation,
1380 sgot->contents + off);
1381 h->got.offset |= 1;
1382 }
1383 }
1384 relocation = sgot->output_offset + off;
70256ad8 1385 }
51e0a107
JH		 1386 else
1387 {
1388 bfd_vma off;
70256ad8 1389
51e0a107
JH		 1390 BFD_ASSERT (local_got_offsets != NULL
1391 && local_got_offsets[r_symndx] != (bfd_vma) -1);
1392
1393 off = local_got_offsets[r_symndx];
1394
1395 /* The offset must always be a multiple of 8. We use
407443a3
AJ		 1396 the least significant bit to record whether we have
1397 already generated the necessary reloc. */
51e0a107
JH		 1398 if ((off & 1) != 0)
1399 off &= ~1;
1400 else
1401 {
1402 bfd_put_64 (output_bfd, relocation, sgot->contents + off);
1403
1404 if (info->shared)
1405 {
1406 asection *srelgot;
1407 Elf_Internal_Rela outrel;
70256ad8 1408
51e0a107
JH		 1409 /* We need to generate a R_X86_64_RELATIVE reloc
1410 for the dynamic linker. */
1411 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
1412 BFD_ASSERT (srelgot != NULL);
1413
1414 outrel.r_offset = (sgot->output_section->vma
1415 + sgot->output_offset
1416 + off);
1417 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
1418 outrel.r_addend = relocation;
1419 bfd_elf64_swap_reloca_out (output_bfd, &outrel,
1420 (((Elf64_External_Rela *)
1421 srelgot->contents)
1422 + srelgot->reloc_count));
1423 ++srelgot->reloc_count;
1424 }
1425
1426 local_got_offsets[r_symndx] |= 1;
1427 }
1428
1429 relocation = sgot->output_section->vma + off;
1430 }
70256ad8
AJ		 1431 break;
1432
1433 case R_X86_64_PLT32:
1434 /* Relocation is to the entry for this symbol in the
1435 procedure linkage table. */
1436
1437 /* Resolve a PLT32 reloc against a local symbol directly,
407443a3 1438 without using the procedure linkage table. */
70256ad8
AJ		 1439 if (h == NULL)
1440 break;
1441
1442 if (h->plt.offset == (bfd_vma) -1 || splt == NULL)
1443 {
1444 /* We didn't make a PLT entry for this symbol. This
407443a3
AJ		 1445 happens when statically linking PIC code, or when
1446 using -Bsymbolic. */
70256ad8
AJ		 1447 break;
1448 }
1449
1450 relocation = (splt->output_section->vma
1451 + splt->output_offset
1452 + h->plt.offset);
1453 break;
1454
1455 case R_X86_64_8:
1456 case R_X86_64_16:
1457 case R_X86_64_32:
1458 case R_X86_64_PC8:
1459 case R_X86_64_PC16:
1460 case R_X86_64_PC32:
1461 /* FIXME: The abi says the linker should make sure the value is
407443a3 1462 the same when it's zeroextended to 64 bit. */
70256ad8
AJ		 1463 if (info->shared
1464 && (input_section->flags & SEC_ALLOC) != 0
1465 && ((r_type != R_X86_64_PC8 && r_type != R_X86_64_PC16
1466 && r_type != R_X86_64_PC32)
1467 || (h != NULL
1468 && h->dynindx != -1
1469 && (! info->symbolic
1470 || (h->elf_link_hash_flags
1471 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1472 {
1473 Elf_Internal_Rela outrel;
1474 boolean skip, relocate;
1475
1476 /* When generating a shared object, these relocations
1477 are copied into the output file to be resolved at run
407443a3 1478 time. */
70256ad8
AJ		 1479
1480 if (sreloc == NULL)
1481 {
1482 const char *name;
1483
1484 name = (bfd_elf_string_from_elf_section
1485 (input_bfd,
1486 elf_elfheader (input_bfd)->e_shstrndx,
1487 elf_section_data (input_section)->rel_hdr.sh_name));
1488 if (name == NULL)
1489 return false;
1490
1491 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1492 && strcmp (bfd_get_section_name (input_bfd,
1493 input_section),
1494 name + 5) == 0);
1495
1496 sreloc = bfd_get_section_by_name (dynobj, name);
1497 BFD_ASSERT (sreloc != NULL);
1498 }
1499
1500 skip = false;
1501
1502 if (elf_section_data (input_section)->stab_info == NULL)
1503 outrel.r_offset = rela->r_offset;
1504 else
1505 {
1506 bfd_vma off;
1507
1508 off = (_bfd_stab_section_offset
1509 (output_bfd, &elf_hash_table (info)->stab_info,
1510 input_section,
1511 &elf_section_data (input_section)->stab_info,
1512 rela->r_offset));
1513 if (off == (bfd_vma) -1)
1514 skip = true;
1515 outrel.r_offset = off;
1516 }
1517
1518 outrel.r_offset += (input_section->output_section->vma
1519 + input_section->output_offset);
1520
1521 if (skip)
1522 {
1523 memset (&outrel, 0, sizeof outrel);
1524 relocate = false;
1525 }
1526 else if ((r_type == R_X86_64_PC8) || (r_type == R_X86_64_PC16)
1527 || (r_type == R_X86_64_PC32))
1528 {
1529 BFD_ASSERT (h != NULL && h->dynindx != -1);
1530 relocate = false;
1531 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
5608e05b 1532 outrel.r_addend = relocation + rela->r_addend;
70256ad8
AJ		 1533 }
1534 else
1535 {
1536 /* h->dynindx may be -1 if this symbol was marked to
407443a3 1537 become local. */
70256ad8
AJ		 1538 if (h == NULL
1539 || ((info->symbolic || h->dynindx == -1)
1540 && (h->elf_link_hash_flags
1541 & ELF_LINK_HASH_DEF_REGULAR) != 0))
1542 {
1543 relocate = true;
1544 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
5608e05b 1545 outrel.r_addend = relocation + rela->r_addend;
70256ad8
AJ		 1546 }
1547 else
1548 {
1549 BFD_ASSERT (h->dynindx != -1);
1550 relocate = false;
1551 outrel.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_32);
5608e05b 1552 outrel.r_addend = relocation + rela->r_addend;
70256ad8
AJ		 1553 }
1554 }
1555
1556 bfd_elf64_swap_reloca_out (output_bfd, &outrel,
1557 (((Elf64_External_Rela *)
1558 sreloc->contents)
1559 + sreloc->reloc_count));
1560 ++sreloc->reloc_count;
1561
1562 /* If this reloc is against an external symbol, we do
1563 not want to fiddle with the addend. Otherwise, we
1564 need to include the symbol value so that it becomes
1565 an addend for the dynamic reloc. */
1566 if (! relocate)
1567 continue;
1568 }
1569
1570 break;
1571
1572 default:
1573 break;
1574 }
8d88c4ca
NC		 1575
1576 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
70256ad8
AJ		 1577 contents, rela->r_offset,
1578 relocation, rela->r_addend);
8d88c4ca
NC		 1579
1580 if (r != bfd_reloc_ok)
8da6118f
KH		 1581 {
1582 switch (r)
1583 {
1584 default:
1585 case bfd_reloc_outofrange:
1586 abort ();
1587 case bfd_reloc_overflow:
1588 {
1589 const char *name;
1590
1591 if (h != NULL)
1592 name = h->root.root.string;
1593 else
1594 {
1595 name = bfd_elf_string_from_elf_section (input_bfd,
1596 symtab_hdr->sh_link,
1597 sym->st_name);
1598 if (name == NULL)
1599 return false;
1600 if (*name == '\0')
1601 name = bfd_section_name (input_bfd, sec);
1602 }
1603 if (! ((*info->callbacks->reloc_overflow)
1604 (info, name, howto->name, (bfd_vma) 0,
70256ad8 1605 input_bfd, input_section, rela->r_offset)))
8da6118f
KH		 1606 return false;
1607 }
1608 break;
1609 }
1610 }
8d88c4ca 1611 }
70256ad8
AJ		 1612
1613 return true;
1614}
1615
1616/* Finish up dynamic symbol handling. We set the contents of various
1617 dynamic sections here. */
1618
1619static boolean
1620elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym)
1621 bfd *output_bfd;
1622 struct bfd_link_info *info;
1623 struct elf_link_hash_entry *h;
1624 Elf_Internal_Sym *sym;
1625{
1626 bfd *dynobj;
1627
1628 dynobj = elf_hash_table (info)->dynobj;
1629
1630 if (h->plt.offset != (bfd_vma) -1)
1631 {
1632 asection *splt;
1633 asection *sgot;
1634 asection *srela;
1635 bfd_vma plt_index;
1636 bfd_vma got_offset;
1637 Elf_Internal_Rela rela;
1638
1639 /* This symbol has an entry in the procedure linkage table. Set
407443a3 1640 it up. */
70256ad8
AJ		 1641
1642 BFD_ASSERT (h->dynindx != -1);
1643
1644 splt = bfd_get_section_by_name (dynobj, ".plt");
1645 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
1646 srela = bfd_get_section_by_name (dynobj, ".rela.plt");
1647 BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
1648
1649 /* Get the index in the procedure linkage table which
1650 corresponds to this symbol. This is the index of this symbol
1651 in all the symbols for which we are making plt entries. The
1652 first entry in the procedure linkage table is reserved. */
1653 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
1654
1655 /* Get the offset into the .got table of the entry that
407443a3 1656 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
70256ad8
AJ		 1657 bytes. The first three are reserved. */
1658 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
1659
1660 /* Fill in the entry in the procedure linkage table. */
1661 memcpy (splt->contents + h->plt.offset, elf64_x86_64_plt_entry,
1662 PLT_ENTRY_SIZE);
1663
1664 /* Insert the relocation positions of the plt section. The magic
1665 numbers at the end of the statements are the positions of the
1666 relocations in the plt section. */
1667 bfd_put_64 (output_bfd, got_offset, splt->contents + h->plt.offset + 2);
1668 bfd_put_64 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
1669 splt->contents + h->plt.offset + 7);
1670 bfd_put_64 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
1671 splt->contents + h->plt.offset + 12);
1672
407443a3 1673 /* Fill in the entry in the global offset table. */
70256ad8
AJ		 1674 bfd_put_64 (output_bfd, (splt->output_section->vma + splt->output_offset
1675 + h->plt.offset + 6),
1676 sgot->contents + got_offset);
1677
1678 /* Fill in the entry in the .rela.plt section. */
1679 rela.r_offset = (sgot->output_section->vma
1680 + sgot->output_offset
1681 + got_offset);
1682 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
1683 rela.r_addend = 0;
1684 bfd_elf64_swap_reloca_out (output_bfd, &rela,
1685 ((Elf64_External_Rela *) srela->contents
1686 + plt_index));
1687
1688 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1689 {
1690 /* Mark the symbol as undefined, rather than as defined in
407443a3 1691 the .plt section. Leave the value alone. */
70256ad8 1692 sym->st_shndx = SHN_UNDEF;
05aa1441
AJ		 1693 /* If the symbol is weak, we do need to clear the value.
1694 Otherwise, the PLT entry would provide a definition for
1695 the symbol even if the symbol wasn't defined anywhere,
1696 and so the symbol would never be NULL. */
1697 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
1698 == 0)
1699 sym->st_value = 0;
70256ad8
AJ		 1700 }
1701 }
1702
1703 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
1704 {
1705 asection *s;
1706 Elf_Internal_Rela rela;
1707
1708 /* This symbol needs a copy reloc. Set it up. */
1709
1710 BFD_ASSERT (h->dynindx != -1
1711 && (h->root.type == bfd_link_hash_defined
1712 || h->root.type == bfd_link_hash_defweak));
1713
1714 s = bfd_get_section_by_name (h->root.u.def.section->owner,
1715 ".rela.bss");
1716 BFD_ASSERT (s != NULL);
1717
1718 rela.r_offset = (h->root.u.def.value
1719 + h->root.u.def.section->output_section->vma
1720 + h->root.u.def.section->output_offset);
1721 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
1722 rela.r_addend = 0;
1723 bfd_elf64_swap_reloca_out (output_bfd, &rela,
1724 ((Elf64_External_Rela *) s->contents
1725 + s->reloc_count));
1726 ++s->reloc_count;
1727 }
1728
1729 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
1730 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
1731 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1732 sym->st_shndx = SHN_ABS;
1733
1734 return true;
1735}
1736
1737/* Finish up the dynamic sections. */
1738
1739static boolean
1740elf64_x86_64_finish_dynamic_sections (output_bfd, info)
1741 bfd *output_bfd;
1742 struct bfd_link_info *info;
1743{
1744 bfd *dynobj;
1745 asection *sdyn;
1746 asection *sgot;
1747
1748 dynobj = elf_hash_table (info)->dynobj;
1749
1750 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
1751
1752 if (elf_hash_table (info)->dynamic_sections_created)
1753 {
1754 asection *splt;
1755 Elf64_External_Dyn *dyncon, *dynconend;
1756
407443a3 1757 BFD_ASSERT (sdyn != NULL);
70256ad8
AJ		 1758
1759 dyncon = (Elf64_External_Dyn *) sdyn->contents;
1760 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1761 for (; dyncon < dynconend; dyncon++)
1762 {
1763 Elf_Internal_Dyn dyn;
1764 const char *name;
1765 asection *s;
1766
1767 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
1768
1769 switch (dyn.d_tag)
1770 {
1771 default:
1772 break;
1773
1774 case DT_PLTGOT:
1775 name = ".got";
1776 goto get_vma;
1777
1778 case DT_JMPREL:
1779 name = ".rela.plt";
1780
1781 get_vma:
1782 s = bfd_get_section_by_name (output_bfd, name);
1783 BFD_ASSERT (s != NULL);
1784 dyn.d_un.d_ptr = s->vma;
1785 break;
1786
1787 case DT_RELASZ:
1788 /* FIXME: This comment and code is from elf64-alpha.c: */
1789 /* My interpretation of the TIS v1.1 ELF document indicates
407443a3 1790 that RELASZ should not include JMPREL. This is not what
70256ad8
AJ		 1791 the rest of the BFD does. It is, however, what the
1792 glibc ld.so wants. Do this fixup here until we found
1793 out who is right. */
1794 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1795 if (s)
1796 {
407443a3 1797 /* Subtract JMPREL size from RELASZ. */
70256ad8
AJ		 1798 dyn.d_un.d_val -=
1799 (s->_cooked_size ? s->_cooked_size : s->_raw_size);
1800 }
1801 break;
1802
1803 case DT_PLTRELSZ:
1804 s = bfd_get_section_by_name (output_bfd, ".rela.plt");
1805 BFD_ASSERT (s != NULL);
1806 dyn.d_un.d_val =
1807 (s->_cooked_size != 0 ? s->_cooked_size : s->_raw_size);
1808 break;
1809 }
1810
1811 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
1812 }
1813
1814 /* Initialize the contents of the .plt section. */
407443a3
AJ		 1815 splt = bfd_get_section_by_name (dynobj, ".plt");
1816 BFD_ASSERT (splt != NULL);
70256ad8
AJ		 1817 if (splt->_raw_size > 0)
1818 {
407443a3 1819 memcpy (splt->contents, elf64_x86_64_plt0_entry, PLT_ENTRY_SIZE);
70256ad8
AJ		 1820 }
1821
1822 elf_section_data (splt->output_section)->this_hdr.sh_entsize =
1823 PLT_ENTRY_SIZE;
1824 }
1825
1826 /* Set the first entry in the global offset table to the address of
1827 the dynamic section. */
407443a3 1828 sgot = bfd_get_section_by_name (dynobj, ".got.plt");
70256ad8
AJ		 1829 BFD_ASSERT (sgot != NULL);
1830 if (sgot->_raw_size > 0)
1831 {
1832 if (sdyn == NULL)
1833 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents);
1834 else
1835 bfd_put_64 (output_bfd,
1836 sdyn->output_section->vma + sdyn->output_offset,
1837 sgot->contents);
1838 /* Write GOT[1] and GOT[2], needed for the linker. */
1839 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + GOT_ENTRY_SIZE);
1840 bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + GOT_ENTRY_SIZE*2);
1841 }
1842
1843 elf_section_data (sgot->output_section)->this_hdr.sh_entsize =
1844 GOT_ENTRY_SIZE;
1845
8d88c4ca
NC		 1846 return true;
1847}
1848
407443a3
AJ		 1849/*
1850 * Why was the hash table entry size definition changed from
1851 * ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
1852 * this is the only reason for the elf64_x86_64_size_info structure.
1853 */
1854
1855const struct elf_size_info elf64_86_64_size_info =
1856{
1857 sizeof (Elf64_External_Ehdr),
1858 sizeof (Elf64_External_Phdr),
1859 sizeof (Elf64_External_Shdr),
1860 sizeof (Elf64_External_Rel),
1861 sizeof (Elf64_External_Rela),
1862 sizeof (Elf64_External_Sym),
1863 sizeof (Elf64_External_Dyn),
1864 sizeof (Elf_External_Note),
1865 8, /* hash-table entry size */
1866 1, /* internal relocations per external relocations */
1867 64, /* arch_size */
1868 8, /* file_align */
1869 ELFCLASS64, EV_CURRENT,
1870 bfd_elf64_write_out_phdrs,
1871 bfd_elf64_write_shdrs_and_ehdr,
1872 bfd_elf64_write_relocs,
1873 bfd_elf64_swap_symbol_out,
1874 bfd_elf64_slurp_reloc_table,
1875 bfd_elf64_slurp_symbol_table,
1876 bfd_elf64_swap_dyn_in,
1877 bfd_elf64_swap_dyn_out,
1878 NULL,
1879 NULL,
1880 NULL,
1881 NULL
1882};
1883
70256ad8
AJ		 1884#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
1885#define TARGET_LITTLE_NAME "elf64-x86-64"
1886#define ELF_ARCH bfd_arch_i386
1887#define ELF_MACHINE_CODE EM_X86_64
1888#define ELF_MAXPAGESIZE 0x100000
1889
407443a3
AJ		 1890#define elf_backend_size_info elf64_86_64_size_info
1891
70256ad8
AJ		 1892#define elf_backend_can_gc_sections 1
1893#define elf_backend_want_got_plt 1
1894#define elf_backend_plt_readonly 1
1895#define elf_backend_want_plt_sym 0
1896#define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
1897#define elf_backend_plt_header_size PLT_ENTRY_SIZE
1898
1899#define elf_info_to_howto elf64_x86_64_info_to_howto
70256ad8
AJ		 1900
1901#define bfd_elf64_bfd_final_link _bfd_elf64_gc_common_final_link
1902#define bfd_elf64_bfd_link_hash_table_create \
1903 elf64_x86_64_link_hash_table_create
407443a3 1904#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
70256ad8
AJ		 1905
1906#define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
1907#define elf_backend_check_relocs elf64_x86_64_check_relocs
1908#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
1909#define elf_backend_finish_dynamic_sections \
1910 elf64_x86_64_finish_dynamic_sections
1911#define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
1912#define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
1913#define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
1914#define elf_backend_relocate_section elf64_x86_64_relocate_section
1915#define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
407443a3 1916#define elf_backend_object_p elf64_x86_64_elf_object_p
8d88c4ca
NC		 1917
1918#include "elf64-target.h"
GDB Binutils - Deliverables
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