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[deliverable/binutils-gdb.git] / bfd / elf64-x86-64.c
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8d88c4ca 1/* X86-64 specific support for 64-bit ELF
c434dee6 2 Copyright 2000, 2001, 2002 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"
c434dee6 23#include "bfdlink.h"
8d88c4ca
NC		 24#include "libbfd.h"
25#include "elf-bfd.h"
26
27#include "elf/x86-64.h"
28
8d88c4ca
NC		 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:
407443a3
AJ		 33 type, size, bitsize, pc_relative, complain_on_overflow,
34 special_function, name, partial_inplace, src_mask, dst_pack, pcrel_offset. */
70256ad8
AJ		 35static reloc_howto_type x86_64_elf_howto_table[] =
36{
407443a3 37 HOWTO(R_X86_64_NONE, 0, 0, 0, false, 0, complain_overflow_dont,
fe4770f4
AJ		 38 bfd_elf_generic_reloc, "R_X86_64_NONE", false, 0x00000000, 0x00000000,
39 false),
407443a3 40 HOWTO(R_X86_64_64, 0, 4, 64, false, 0, complain_overflow_bitfield,
fe4770f4
AJ		 41 bfd_elf_generic_reloc, "R_X86_64_64", false, MINUS_ONE, MINUS_ONE,
42 false),
bffbf940 43 HOWTO(R_X86_64_PC32, 0, 2, 32, true, 0, complain_overflow_signed,
fe4770f4
AJ		 44 bfd_elf_generic_reloc, "R_X86_64_PC32", false, 0xffffffff, 0xffffffff,
45 true),
bffbf940 46 HOWTO(R_X86_64_GOT32, 0, 2, 32, false, 0, complain_overflow_signed,
fe4770f4
AJ		 47 bfd_elf_generic_reloc, "R_X86_64_GOT32", false, 0xffffffff, 0xffffffff,
48 false),
bffbf940 49 HOWTO(R_X86_64_PLT32, 0, 2, 32, true, 0, complain_overflow_signed,
fe4770f4
AJ		 50 bfd_elf_generic_reloc, "R_X86_64_PLT32", false, 0xffffffff, 0xffffffff,
51 true),
bffbf940 52 HOWTO(R_X86_64_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield,
fe4770f4
AJ		 53 bfd_elf_generic_reloc, "R_X86_64_COPY", false, 0xffffffff, 0xffffffff,
54 false),
407443a3 55 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, false, 0, complain_overflow_bitfield,
fe4770f4
AJ		 56 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", false, MINUS_ONE,
57 MINUS_ONE, false),
407443a3 58 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, false, 0, complain_overflow_bitfield,
fe4770f4
AJ		 59 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", false, MINUS_ONE,
60 MINUS_ONE, false),
4a73f21b 61 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, false, 0, complain_overflow_bitfield,
fe4770f4
AJ		 62 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", false, MINUS_ONE,
63 MINUS_ONE, false),
bffbf940 64 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, true, 0, complain_overflow_signed,
fe4770f4
AJ		 65 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", false, 0xffffffff,
66 0xffffffff, true),
bffbf940 67 HOWTO(R_X86_64_32, 0, 2, 32, false, 0, complain_overflow_unsigned,
fe4770f4
AJ		 68 bfd_elf_generic_reloc, "R_X86_64_32", false, 0xffffffff, 0xffffffff,
69 false),
bffbf940 70 HOWTO(R_X86_64_32S, 0, 2, 32, false, 0, complain_overflow_signed,
fe4770f4
AJ		 71 bfd_elf_generic_reloc, "R_X86_64_32S", false, 0xffffffff, 0xffffffff,
72 false),
407443a3
AJ		 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,
fe4770f4 80 bfd_elf_generic_reloc, "R_X86_64_PC8", false, 0xff, 0xff, true),
bffbf940
JJ		 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),
fe4770f4
AJ		 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)
8d88c4ca
NC		 114};
115
116/* Map BFD relocs to the x86_64 elf relocs. */
70256ad8
AJ		 117struct elf_reloc_map
118{
8d88c4ca
NC		 119 bfd_reloc_code_real_type bfd_reloc_val;
120 unsigned char elf_reloc_val;
121};
122
dc810e39 123static const struct elf_reloc_map x86_64_reloc_map[] =
8d88c4ca 124{
70256ad8
AJ		 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, },
bffbf940
JJ		 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, },
fe4770f4
AJ		 149 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
150 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
8d88c4ca
NC		 151};
152
8d88c4ca
NC		 153static reloc_howto_type *elf64_x86_64_reloc_type_lookup
154 PARAMS ((bfd *, bfd_reloc_code_real_type));
155static void elf64_x86_64_info_to_howto
156 PARAMS ((bfd *, arelent *, Elf64_Internal_Rela *));
cedb70c5 157static boolean elf64_x86_64_grok_prstatus
3bab7989 158 PARAMS ((bfd *, Elf_Internal_Note *));
cedb70c5 159static boolean elf64_x86_64_grok_psinfo
3bab7989 160 PARAMS ((bfd *, Elf_Internal_Note *));
8d88c4ca
NC		 161static struct bfd_link_hash_table *elf64_x86_64_link_hash_table_create
162 PARAMS ((bfd *));
bffbf940
JJ		 163static int elf64_x86_64_tls_transition
164 PARAMS ((struct bfd_link_info *, int, int));
165static boolean elf64_x86_64_mkobject
166 PARAMS((bfd *));
1e1b3bc2 167static boolean elf64_x86_64_elf_object_p PARAMS ((bfd *abfd));
c434dee6
AJ		 168static boolean create_got_section
169 PARAMS((bfd *, struct bfd_link_info *));
170static boolean elf64_x86_64_create_dynamic_sections
171 PARAMS((bfd *, struct bfd_link_info *));
172static void elf64_x86_64_copy_indirect_symbol
b48fa14c
AM		 173 PARAMS ((struct elf_backend_data *, struct elf_link_hash_entry *,
174 struct elf_link_hash_entry *));
1e1b3bc2
AJ		 175static boolean elf64_x86_64_check_relocs
176 PARAMS ((bfd *, struct bfd_link_info *, asection *sec,
177 const Elf_Internal_Rela *));
178static asection *elf64_x86_64_gc_mark_hook
1e2f5b6e 179 PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
1e1b3bc2
AJ		 180 struct elf_link_hash_entry *, Elf_Internal_Sym *));
181
182static boolean elf64_x86_64_gc_sweep_hook
183 PARAMS ((bfd *, struct bfd_link_info *, asection *,
184 const Elf_Internal_Rela *));
70256ad8 185
c434dee6 186static struct bfd_hash_entry *link_hash_newfunc
70256ad8
AJ		 187 PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
188static boolean elf64_x86_64_adjust_dynamic_symbol
189 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
190
c434dee6
AJ		 191static boolean allocate_dynrelocs
192 PARAMS ((struct elf_link_hash_entry *, PTR));
193static boolean readonly_dynrelocs
194 PARAMS ((struct elf_link_hash_entry *, PTR));
70256ad8
AJ		 195static boolean elf64_x86_64_size_dynamic_sections
196 PARAMS ((bfd *, struct bfd_link_info *));
bffbf940
JJ		 197static bfd_vma dtpoff_base
198 PARAMS ((struct bfd_link_info *));
199static bfd_vma tpoff
200 PARAMS ((struct bfd_link_info *, bfd_vma));
8d88c4ca
NC		 201static boolean elf64_x86_64_relocate_section
202 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
407443a3 203 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
70256ad8
AJ		 204static boolean elf64_x86_64_finish_dynamic_symbol
205 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
206 Elf_Internal_Sym *sym));
207static boolean elf64_x86_64_finish_dynamic_sections
208 PARAMS ((bfd *, struct bfd_link_info *));
f51e552e
AM		 209static enum elf_reloc_type_class elf64_x86_64_reloc_type_class
210 PARAMS ((const Elf_Internal_Rela *));
8d88c4ca
NC		 211
212/* Given a BFD reloc type, return a HOWTO structure. */
213static reloc_howto_type *
214elf64_x86_64_reloc_type_lookup (abfd, code)
215 bfd *abfd ATTRIBUTE_UNUSED;
216 bfd_reloc_code_real_type code;
217{
218 unsigned int i;
219 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
220 i++)
221 {
222 if (x86_64_reloc_map[i].bfd_reloc_val == code)
ffaef159 223 return &x86_64_elf_howto_table[i];
8d88c4ca
NC		 224 }
225 return 0;
226}
227
8d88c4ca 228/* Given an x86_64 ELF reloc type, fill in an arelent structure. */
8da6118f 229
8d88c4ca
NC		 230static void
231elf64_x86_64_info_to_howto (abfd, cache_ptr, dst)
232 bfd *abfd ATTRIBUTE_UNUSED;
233 arelent *cache_ptr;
234 Elf64_Internal_Rela *dst;
235{
fe4770f4 236 unsigned r_type, i;
8d88c4ca
NC		 237
238 r_type = ELF64_R_TYPE (dst->r_info);
fe4770f4
AJ		 239 if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT)
240 {
bffbf940 241 BFD_ASSERT (r_type <= (unsigned int) R_X86_64_TPOFF32);
fe4770f4
AJ		 242 i = r_type;
243 }
244 else
245 {
246 BFD_ASSERT (r_type < (unsigned int) R_X86_64_max);
bffbf940 247 i = r_type - ((unsigned int) R_X86_64_GNU_VTINHERIT - R_X86_64_TPOFF32 - 1);
fe4770f4
AJ		 248 }
249 cache_ptr->howto = &x86_64_elf_howto_table[i];
8d88c4ca
NC		 250 BFD_ASSERT (r_type == cache_ptr->howto->type);
251}
70256ad8 252\f
3bab7989
ML		 253/* Support for core dump NOTE sections. */
254static boolean
255elf64_x86_64_grok_prstatus (abfd, note)
256 bfd *abfd;
257 Elf_Internal_Note *note;
258{
259 int offset;
260 size_t raw_size;
261
262 switch (note->descsz)
263 {
264 default:
265 return false;
266
267 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
268 /* pr_cursig */
cedb70c5 269 elf_tdata (abfd)->core_signal
3bab7989
ML		 270 = bfd_get_16 (abfd, note->descdata + 12);
271
272 /* pr_pid */
cedb70c5 273 elf_tdata (abfd)->core_pid
3bab7989
ML		 274 = bfd_get_32 (abfd, note->descdata + 32);
275
276 /* pr_reg */
277 offset = 112;
278 raw_size = 216;
279
280 break;
281 }
282
283 /* Make a ".reg/999" section. */
284 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
285 raw_size, note->descpos + offset);
286}
287
288static boolean
289elf64_x86_64_grok_psinfo (abfd, note)
290 bfd *abfd;
291 Elf_Internal_Note *note;
292{
293 switch (note->descsz)
294 {
295 default:
296 return false;
297
298 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
299 elf_tdata (abfd)->core_program
300 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
301 elf_tdata (abfd)->core_command
302 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
303 }
304
305 /* Note that for some reason, a spurious space is tacked
306 onto the end of the args in some (at least one anyway)
307 implementations, so strip it off if it exists. */
308
309 {
310 char *command = elf_tdata (abfd)->core_command;
311 int n = strlen (command);
312
313 if (0 < n && command[n - 1] == ' ')
314 command[n - 1] = '\0';
315 }
316
317 return true;
318}
319\f
407443a3 320/* Functions for the x86-64 ELF linker. */
70256ad8 321
407443a3 322/* The name of the dynamic interpreter. This is put in the .interp
70256ad8
AJ		 323 section. */
324
407443a3 325#define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
70256ad8
AJ		 326
327/* The size in bytes of an entry in the global offset table. */
328
329#define GOT_ENTRY_SIZE 8
8d88c4ca 330
70256ad8 331/* The size in bytes of an entry in the procedure linkage table. */
8d88c4ca 332
70256ad8
AJ		 333#define PLT_ENTRY_SIZE 16
334
335/* The first entry in a procedure linkage table looks like this. See the
336 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
337
338static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
339{
653165cc
AJ		 340 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
341 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
342 0x90, 0x90, 0x90, 0x90 /* pad out to 16 bytes with nops. */
70256ad8
AJ		 343};
344
345/* Subsequent entries in a procedure linkage table look like this. */
346
347static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
348{
653165cc 349 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
407443a3 350 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
653165cc 351 0x68, /* pushq immediate */
70256ad8
AJ		 352 0, 0, 0, 0, /* replaced with index into relocation table. */
353 0xe9, /* jmp relative */
354 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
355};
356
357/* The x86-64 linker needs to keep track of the number of relocs that
985142a4 358 it decides to copy as dynamic relocs in check_relocs for each symbol.
c434dee6
AJ		 359 This is so that it can later discard them if they are found to be
360 unnecessary. We store the information in a field extending the
361 regular ELF linker hash table. */
70256ad8 362
c434dee6 363struct elf64_x86_64_dyn_relocs
70256ad8
AJ		 364{
365 /* Next section. */
c434dee6
AJ		 366 struct elf64_x86_64_dyn_relocs *next;
367
368 /* The input section of the reloc. */
369 asection *sec;
370
371 /* Total number of relocs copied for the input section. */
70256ad8 372 bfd_size_type count;
c434dee6
AJ		 373
374 /* Number of pc-relative relocs copied for the input section. */
375 bfd_size_type pc_count;
70256ad8
AJ		 376};
377
378/* x86-64 ELF linker hash entry. */
379
380struct elf64_x86_64_link_hash_entry
381{
c434dee6 382 struct elf_link_hash_entry elf;
70256ad8 383
c434dee6
AJ		 384 /* Track dynamic relocs copied for this symbol. */
385 struct elf64_x86_64_dyn_relocs *dyn_relocs;
bffbf940
JJ		 386
387#define GOT_UNKNOWN 0
388#define GOT_NORMAL 1
389#define GOT_TLS_GD 2
390#define GOT_TLS_IE 3
391 unsigned char tls_type;
392};
393
394#define elf64_x86_64_hash_entry(ent) \
395 ((struct elf64_x86_64_link_hash_entry *)(ent))
396
397struct elf64_x86_64_obj_tdata
398{
399 struct elf_obj_tdata root;
400
401 /* tls_type for each local got entry. */
402 char *local_got_tls_type;
70256ad8
AJ		 403};
404
bffbf940
JJ		 405#define elf64_x86_64_tdata(abfd) \
406 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
407
408#define elf64_x86_64_local_got_tls_type(abfd) \
409 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
410
411
c434dee6 412/* x86-64 ELF linker hash table. */
8d88c4ca 413
407443a3
AJ		 414struct elf64_x86_64_link_hash_table
415{
c434dee6 416 struct elf_link_hash_table elf;
70256ad8 417
c434dee6
AJ		 418 /* Short-cuts to get to dynamic linker sections. */
419 asection *sgot;
420 asection *sgotplt;
421 asection *srelgot;
422 asection *splt;
423 asection *srelplt;
424 asection *sdynbss;
425 asection *srelbss;
70256ad8 426
bffbf940
JJ		 427 union {
428 bfd_signed_vma refcount;
429 bfd_vma offset;
430 } tls_ld_got;
431
c434dee6
AJ		 432 /* Small local sym to section mapping cache. */
433 struct sym_sec_cache sym_sec;
434};
70256ad8
AJ		 435
436/* Get the x86-64 ELF linker hash table from a link_info structure. */
8d88c4ca
NC		 437
438#define elf64_x86_64_hash_table(p) \
439 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
440
407443a3 441/* Create an entry in an x86-64 ELF linker hash table. */
70256ad8
AJ		 442
443static struct bfd_hash_entry *
c434dee6 444link_hash_newfunc (entry, table, string)
70256ad8
AJ		 445 struct bfd_hash_entry *entry;
446 struct bfd_hash_table *table;
447 const char *string;
448{
70256ad8 449 /* Allocate the structure if it has not already been allocated by a
c434dee6
AJ		 450 subclass. */
451 if (entry == NULL)
452 {
453 entry = bfd_hash_allocate (table,
454 sizeof (struct elf64_x86_64_link_hash_entry));
455 if (entry == NULL)
456 return entry;
457 }
70256ad8
AJ		 458
459 /* Call the allocation method of the superclass. */
c434dee6
AJ		 460 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
461 if (entry != NULL)
70256ad8 462 {
c434dee6
AJ		 463 struct elf64_x86_64_link_hash_entry *eh;
464
465 eh = (struct elf64_x86_64_link_hash_entry *) entry;
466 eh->dyn_relocs = NULL;
bffbf940 467 eh->tls_type = GOT_UNKNOWN;
70256ad8
AJ		 468 }
469
c434dee6 470 return entry;
70256ad8
AJ		 471}
472
8d88c4ca
NC		 473/* Create an X86-64 ELF linker hash table. */
474
475static struct bfd_link_hash_table *
476elf64_x86_64_link_hash_table_create (abfd)
477 bfd *abfd;
478{
479 struct elf64_x86_64_link_hash_table *ret;
dc810e39 480 bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table);
8d88c4ca 481
e2d34d7d 482 ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt);
c434dee6 483 if (ret == NULL)
8d88c4ca
NC		 484 return NULL;
485
c434dee6 486 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
8d88c4ca 487 {
e2d34d7d 488 free (ret);
8d88c4ca
NC		 489 return NULL;
490 }
491
c434dee6
AJ		 492 ret->sgot = NULL;
493 ret->sgotplt = NULL;
494 ret->srelgot = NULL;
495 ret->splt = NULL;
496 ret->srelplt = NULL;
497 ret->sdynbss = NULL;
498 ret->srelbss = NULL;
499 ret->sym_sec.abfd = NULL;
bffbf940 500 ret->tls_ld_got.refcount = 0;
c434dee6
AJ		 501
502 return &ret->elf.root;
503}
504
505/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
506 shortcuts to them in our hash table. */
507
508static boolean
509create_got_section (dynobj, info)
510 bfd *dynobj;
511 struct bfd_link_info *info;
512{
513 struct elf64_x86_64_link_hash_table *htab;
514
515 if (! _bfd_elf_create_got_section (dynobj, info))
516 return false;
517
518 htab = elf64_x86_64_hash_table (info);
519 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
520 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
521 if (!htab->sgot || !htab->sgotplt)
522 abort ();
523
524 htab->srelgot = bfd_make_section (dynobj, ".rela.got");
525 if (htab->srelgot == NULL
526 || ! bfd_set_section_flags (dynobj, htab->srelgot,
527 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
528 | SEC_IN_MEMORY | SEC_LINKER_CREATED
529 | SEC_READONLY))
530 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
531 return false;
532 return true;
533}
534
535/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
536 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
537 hash table. */
538
539static boolean
540elf64_x86_64_create_dynamic_sections (dynobj, info)
541 bfd *dynobj;
542 struct bfd_link_info *info;
543{
544 struct elf64_x86_64_link_hash_table *htab;
545
546 htab = elf64_x86_64_hash_table (info);
547 if (!htab->sgot && !create_got_section (dynobj, info))
548 return false;
549
550 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
551 return false;
552
553 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
554 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
555 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
556 if (!info->shared)
557 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
558
559 if (!htab->splt || !htab->srelplt || !htab->sdynbss
560 || (!info->shared && !htab->srelbss))
561 abort ();
562
563 return true;
564}
565
566/* Copy the extra info we tack onto an elf_link_hash_entry. */
567
568static void
b48fa14c
AM		 569elf64_x86_64_copy_indirect_symbol (bed, dir, ind)
570 struct elf_backend_data *bed;
c434dee6
AJ		 571 struct elf_link_hash_entry *dir, *ind;
572{
573 struct elf64_x86_64_link_hash_entry *edir, *eind;
574
575 edir = (struct elf64_x86_64_link_hash_entry *) dir;
576 eind = (struct elf64_x86_64_link_hash_entry *) ind;
577
578 if (eind->dyn_relocs != NULL)
579 {
580 if (edir->dyn_relocs != NULL)
581 {
582 struct elf64_x86_64_dyn_relocs **pp;
583 struct elf64_x86_64_dyn_relocs *p;
584
585 if (ind->root.type == bfd_link_hash_indirect)
586 abort ();
587
588 /* Add reloc counts against the weak sym to the strong sym
589 list. Merge any entries against the same section. */
590 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
591 {
592 struct elf64_x86_64_dyn_relocs *q;
593
594 for (q = edir->dyn_relocs; q != NULL; q = q->next)
595 if (q->sec == p->sec)
596 {
597 q->pc_count += p->pc_count;
598 q->count += p->count;
599 *pp = p->next;
600 break;
601 }
602 if (q == NULL)
603 pp = &p->next;
604 }
605 *pp = edir->dyn_relocs;
606 }
607
608 edir->dyn_relocs = eind->dyn_relocs;
609 eind->dyn_relocs = NULL;
610 }
611
bffbf940
JJ		 612 if (ind->root.type == bfd_link_hash_indirect
613 && dir->got.refcount <= 0)
614 {
615 edir->tls_type = eind->tls_type;
616 eind->tls_type = GOT_UNKNOWN;
617 }
618
b48fa14c 619 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
8d88c4ca
NC		 620}
621
1e1b3bc2 622static boolean
bffbf940 623elf64_x86_64_mkobject (abfd)
8d88c4ca
NC		 624 bfd *abfd;
625{
bffbf940
JJ		 626 bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata);
627 abfd->tdata.any = bfd_zalloc (abfd, amt);
628 if (abfd->tdata.any == NULL)
629 return false;
630 return true;
631}
632
633static boolean
634elf64_x86_64_elf_object_p (abfd)
635 bfd *abfd;
636{
637 /* Allocate our special target data. */
638 struct elf64_x86_64_obj_tdata *new_tdata;
639 bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata);
640 new_tdata = bfd_zalloc (abfd, amt);
641 if (new_tdata == NULL)
642 return false;
643 new_tdata->root = *abfd->tdata.elf_obj_data;
644 abfd->tdata.any = new_tdata;
8d88c4ca
NC		 645 /* Set the right machine number for an x86-64 elf64 file. */
646 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
647 return true;
648}
649
bffbf940
JJ		 650static int
651elf64_x86_64_tls_transition (info, r_type, is_local)
652 struct bfd_link_info *info;
653 int r_type;
654 int is_local;
655{
656 if (info->shared)
657 return r_type;
658
659 switch (r_type)
660 {
661 case R_X86_64_TLSGD:
662 case R_X86_64_GOTTPOFF:
663 if (is_local)
664 return R_X86_64_TPOFF32;
665 return R_X86_64_GOTTPOFF;
666 case R_X86_64_TLSLD:
667 return R_X86_64_TPOFF32;
668 }
669
670 return r_type;
671}
672
70256ad8 673/* Look through the relocs for a section during the first phase, and
c434dee6
AJ		 674 calculate needed space in the global offset table, procedure
675 linkage table, and dynamic reloc sections. */
70256ad8
AJ		 676
677static boolean
678elf64_x86_64_check_relocs (abfd, info, sec, relocs)
679 bfd *abfd;
680 struct bfd_link_info *info;
681 asection *sec;
682 const Elf_Internal_Rela *relocs;
683{
c434dee6 684 struct elf64_x86_64_link_hash_table *htab;
70256ad8
AJ		 685 Elf_Internal_Shdr *symtab_hdr;
686 struct elf_link_hash_entry **sym_hashes;
70256ad8
AJ		 687 const Elf_Internal_Rela *rel;
688 const Elf_Internal_Rela *rel_end;
70256ad8
AJ		 689 asection *sreloc;
690
691 if (info->relocateable)
692 return true;
693
c434dee6 694 htab = elf64_x86_64_hash_table (info);
70256ad8
AJ		 695 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
696 sym_hashes = elf_sym_hashes (abfd);
70256ad8 697
c434dee6
AJ		 698 sreloc = NULL;
699
70256ad8
AJ		 700 rel_end = relocs + sec->reloc_count;
701 for (rel = relocs; rel < rel_end; rel++)
702 {
bffbf940 703 unsigned int r_type;
70256ad8
AJ		 704 unsigned long r_symndx;
705 struct elf_link_hash_entry *h;
706
707 r_symndx = ELF64_R_SYM (rel->r_info);
bffbf940 708 r_type = ELF64_R_TYPE (rel->r_info);
c434dee6
AJ		 709
710 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
711 {
712 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
713 bfd_archive_filename (abfd),
714 r_symndx);
715 return false;
716 }
717
70256ad8
AJ		 718 if (r_symndx < symtab_hdr->sh_info)
719 h = NULL;
720 else
721 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
722
bffbf940
JJ		 723 r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL);
724 switch (r_type)
70256ad8 725 {
bffbf940
JJ		 726 case R_X86_64_TLSLD:
727 htab->tls_ld_got.refcount += 1;
728 goto create_got;
729
730 case R_X86_64_TPOFF32:
731 if (info->shared)
70256ad8 732 {
bffbf940
JJ		 733 (*_bfd_error_handler)
734 (_("%s: relocation %s can not be used when making a shared object; recompile with -fPIC"),
735 bfd_archive_filename (abfd),
736 x86_64_elf_howto_table[r_type].name);
737 bfd_set_error (bfd_error_bad_value);
738 return false;
70256ad8 739 }
bffbf940 740 break;
c434dee6 741
bffbf940
JJ		 742 case R_X86_64_GOTTPOFF:
743 if (info->shared)
744 info->flags |= DF_STATIC_TLS;
745 /* Fall through */
70256ad8 746
bffbf940
JJ		 747 case R_X86_64_GOT32:
748 case R_X86_64_GOTPCREL:
749 case R_X86_64_TLSGD:
750 /* This symbol requires a global offset table entry. */
751 {
752 int tls_type, old_tls_type;
753
754 switch (r_type)
755 {
756 default: tls_type = GOT_NORMAL; break;
757 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
758 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
759 }
760
761 if (h != NULL)
762 {
763 h->got.refcount += 1;
764 old_tls_type = elf64_x86_64_hash_entry (h)->tls_type;
765 }
766 else
767 {
768 bfd_signed_vma *local_got_refcounts;
769
770 /* This is a global offset table entry for a local symbol. */
771 local_got_refcounts = elf_local_got_refcounts (abfd);
772 if (local_got_refcounts == NULL)
773 {
774 bfd_size_type size;
775
776 size = symtab_hdr->sh_info;
777 size *= sizeof (bfd_signed_vma) + sizeof (char);
778 local_got_refcounts = ((bfd_signed_vma *)
779 bfd_zalloc (abfd, size));
780 if (local_got_refcounts == NULL)
781 return false;
782 elf_local_got_refcounts (abfd) = local_got_refcounts;
783 elf64_x86_64_local_got_tls_type (abfd)
784 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
785 }
786 local_got_refcounts[r_symndx] += 1;
787 old_tls_type
788 = elf64_x86_64_local_got_tls_type (abfd) [r_symndx];
789 }
790
791 /* If a TLS symbol is accessed using IE at least once,
792 there is no point to use dynamic model for it. */
793 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
794 && (old_tls_type != GOT_TLS_GD || tls_type != GOT_TLS_IE))
795 {
796 if (old_tls_type == GOT_TLS_IE && tls_type == GOT_TLS_GD)
797 tls_type = old_tls_type;
798 else
799 {
800 (*_bfd_error_handler)
801 (_("%s: %s' accessed both as normal and thread local symbol"),
802 bfd_archive_filename (abfd),
803 h ? h->root.root.string : "<local>");
70256ad8 804 return false;
bffbf940
JJ		 805 }
806 }
807
808 if (old_tls_type != tls_type)
809 {
810 if (h != NULL)
811 elf64_x86_64_hash_entry (h)->tls_type = tls_type;
812 else
813 elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
814 }
815 }
c434dee6
AJ		 816 /* Fall through */
817
818 //case R_X86_64_GOTPCREL:
bffbf940 819 create_got:
c434dee6
AJ		 820 if (htab->sgot == NULL)
821 {
822 if (htab->elf.dynobj == NULL)
823 htab->elf.dynobj = abfd;
824 if (!create_got_section (htab->elf.dynobj, info))
825 return false;
826 }
70256ad8
AJ		 827 break;
828
829 case R_X86_64_PLT32:
830 /* This symbol requires a procedure linkage table entry. We
407443a3
AJ		 831 actually build the entry in adjust_dynamic_symbol,
832 because this might be a case of linking PIC code which is
833 never referenced by a dynamic object, in which case we
834 don't need to generate a procedure linkage table entry
835 after all. */
70256ad8
AJ		 836
837 /* If this is a local symbol, we resolve it directly without
407443a3 838 creating a procedure linkage table entry. */
70256ad8
AJ		 839 if (h == NULL)
840 continue;
841
cc78d0af 842 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
51b64d56 843 h->plt.refcount += 1;
70256ad8
AJ		 844 break;
845
cc78d0af
AJ		 846 case R_X86_64_8:
847 case R_X86_64_16:
70256ad8
AJ		 848 case R_X86_64_32:
849 case R_X86_64_32S:
1b71fb54
AJ		 850 /* Let's help debug shared library creation. These relocs
851 cannot be used in shared libs. Don't error out for
852 sections we don't care about, such as debug sections or
853 non-constant sections. */
854 if (info->shared
855 && (sec->flags & SEC_ALLOC) != 0
856 && (sec->flags & SEC_READONLY) != 0)
857 {
858 (*_bfd_error_handler)
859 (_("%s: relocation %s can not be used when making a shared object; recompile with -fPIC"),
860 bfd_archive_filename (abfd),
bffbf940 861 x86_64_elf_howto_table[r_type].name);
1b71fb54
AJ		 862 bfd_set_error (bfd_error_bad_value);
863 return false;
864 }
865 /* Fall through. */
866
c434dee6
AJ		 867 case R_X86_64_PC8:
868 case R_X86_64_PC16:
70256ad8 869 case R_X86_64_PC32:
1b71fb54 870 case R_X86_64_64:
c434dee6
AJ		 871 if (h != NULL && !info->shared)
872 {
873 /* If this reloc is in a read-only section, we might
874 need a copy reloc. We can't check reliably at this
875 stage whether the section is read-only, as input
876 sections have not yet been mapped to output sections.
877 Tentatively set the flag for now, and correct in
878 adjust_dynamic_symbol. */
879 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
880
881 /* We may need a .plt entry if the function this reloc
882 refers to is in a shared lib. */
883 h->plt.refcount += 1;
884 }
70256ad8
AJ		 885
886 /* If we are creating a shared library, and this is a reloc
887 against a global symbol, or a non PC relative reloc
888 against a local symbol, then we need to copy the reloc
889 into the shared library. However, if we are linking with
890 -Bsymbolic, we do not need to copy a reloc against a
891 global symbol which is defined in an object we are
407443a3 892 including in the link (i.e., DEF_REGULAR is set). At
70256ad8
AJ		 893 this point we have not seen all the input files, so it is
894 possible that DEF_REGULAR is not set now but will be set
c434dee6
AJ		 895 later (it is never cleared). In case of a weak definition,
896 DEF_REGULAR may be cleared later by a strong definition in
897 a shared library. We account for that possibility below by
898 storing information in the relocs_copied field of the hash
899 table entry. A similar situation occurs when creating
900 shared libraries and symbol visibility changes render the
901 symbol local.
902
903 If on the other hand, we are creating an executable, we
904 may need to keep relocations for symbols satisfied by a
905 dynamic library if we manage to avoid copy relocs for the
906 symbol. */
907 if ((info->shared
908 && (sec->flags & SEC_ALLOC) != 0
bffbf940
JJ		 909 && (((r_type != R_X86_64_PC8)
910 && (r_type != R_X86_64_PC16)
911 && (r_type != R_X86_64_PC32))
c434dee6
AJ		 912 || (h != NULL
913 && (! info->symbolic
914 || h->root.type == bfd_link_hash_defweak
915 || (h->elf_link_hash_flags
916 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
917 || (!info->shared
918 && (sec->flags & SEC_ALLOC) != 0
919 && h != NULL
920 && (h->root.type == bfd_link_hash_defweak
921 || (h->elf_link_hash_flags
922 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
70256ad8 923 {
c434dee6
AJ		 924 struct elf64_x86_64_dyn_relocs *p;
925 struct elf64_x86_64_dyn_relocs **head;
926
927 /* We must copy these reloc types into the output file.
928 Create a reloc section in dynobj and make room for
929 this reloc. */
70256ad8
AJ		 930 if (sreloc == NULL)
931 {
932 const char *name;
c434dee6 933 bfd *dynobj;
70256ad8
AJ		 934
935 name = (bfd_elf_string_from_elf_section
936 (abfd,
937 elf_elfheader (abfd)->e_shstrndx,
938 elf_section_data (sec)->rel_hdr.sh_name));
939 if (name == NULL)
940 return false;
941
c434dee6
AJ		 942 if (strncmp (name, ".rela", 5) != 0
943 || strcmp (bfd_get_section_name (abfd, sec),
944 name + 5) != 0)
945 {
946 (*_bfd_error_handler)
947 (_("%s: bad relocation section name `%s\'"),
948 bfd_archive_filename (abfd), name);
949 }
950
951 if (htab->elf.dynobj == NULL)
952 htab->elf.dynobj = abfd;
953
954 dynobj = htab->elf.dynobj;
70256ad8
AJ		 955
956 sreloc = bfd_get_section_by_name (dynobj, name);
957 if (sreloc == NULL)
958 {
959 flagword flags;
960
961 sreloc = bfd_make_section (dynobj, name);
962 flags = (SEC_HAS_CONTENTS | SEC_READONLY
963 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
964 if ((sec->flags & SEC_ALLOC) != 0)
965 flags |= SEC_ALLOC | SEC_LOAD;
966 if (sreloc == NULL
967 || ! bfd_set_section_flags (dynobj, sreloc, flags)
cc78d0af 968 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
70256ad8
AJ		 969 return false;
970 }
c434dee6 971 elf_section_data (sec)->sreloc = sreloc;
70256ad8
AJ		 972 }
973
c434dee6
AJ		 974 /* If this is a global symbol, we count the number of
975 relocations we need for this symbol. */
976 if (h != NULL)
70256ad8 977 {
c434dee6
AJ		 978 head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs;
979 }
980 else
981 {
982 /* Track dynamic relocs needed for local syms too.
983 We really need local syms available to do this
984 easily. Oh well. */
985
986 asection *s;
987 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
988 sec, r_symndx);
989 if (s == NULL)
990 return false;
70256ad8 991
c434dee6
AJ		 992 head = ((struct elf64_x86_64_dyn_relocs **)
993 &elf_section_data (s)->local_dynrel);
994 }
70256ad8 995
c434dee6
AJ		 996 p = *head;
997 if (p == NULL || p->sec != sec)
998 {
999 bfd_size_type amt = sizeof *p;
1000 p = ((struct elf64_x86_64_dyn_relocs *)
1001 bfd_alloc (htab->elf.dynobj, amt));
70256ad8 1002 if (p == NULL)
c434dee6
AJ		 1003 return false;
1004 p->next = *head;
1005 *head = p;
1006 p->sec = sec;
1007 p->count = 0;
1008 p->pc_count = 0;
70256ad8 1009 }
c434dee6
AJ		 1010
1011 p->count += 1;
bffbf940
JJ		 1012 if (r_type == R_X86_64_PC8
1013 || r_type == R_X86_64_PC16
1014 || r_type == R_X86_64_PC32)
c434dee6 1015 p->pc_count += 1;
70256ad8
AJ		 1016 }
1017 break;
fe4770f4
AJ		 1018
1019 /* This relocation describes the C++ object vtable hierarchy.
1020 Reconstruct it for later use during GC. */
1021 case R_X86_64_GNU_VTINHERIT:
1022 if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1023 return false;
1024 break;
1025
1026 /* This relocation describes which C++ vtable entries are actually
1027 used. Record for later use during GC. */
1028 case R_X86_64_GNU_VTENTRY:
cc78d0af 1029 if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
fe4770f4
AJ		 1030 return false;
1031 break;
c434dee6
AJ		 1032
1033 default:
1034 break;
70256ad8
AJ		 1035 }
1036 }
1037
1038 return true;
1039}
1040
1041/* Return the section that should be marked against GC for a given
407443a3 1042 relocation. */
70256ad8
AJ		 1043
1044static asection *
1e2f5b6e
AM		 1045elf64_x86_64_gc_mark_hook (sec, info, rel, h, sym)
1046 asection *sec;
70256ad8 1047 struct bfd_link_info *info ATTRIBUTE_UNUSED;
c434dee6 1048 Elf_Internal_Rela *rel;
70256ad8
AJ		 1049 struct elf_link_hash_entry *h;
1050 Elf_Internal_Sym *sym;
1051{
1052 if (h != NULL)
1053 {
fe4770f4 1054 switch (ELF64_R_TYPE (rel->r_info))
70256ad8 1055 {
fe4770f4
AJ		 1056 case R_X86_64_GNU_VTINHERIT:
1057 case R_X86_64_GNU_VTENTRY:
1058 break;
70256ad8
AJ		 1059
1060 default:
fe4770f4
AJ		 1061 switch (h->root.type)
1062 {
1063 case bfd_link_hash_defined:
1064 case bfd_link_hash_defweak:
1065 return h->root.u.def.section;
1066
1067 case bfd_link_hash_common:
1068 return h->root.u.c.p->section;
1069
1070 default:
1071 break;
1072 }
70256ad8
AJ		 1073 }
1074 }
1075 else
1e2f5b6e 1076 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
70256ad8
AJ		 1077
1078 return NULL;
1079}
1080
407443a3 1081/* Update the got entry reference counts for the section being removed. */
70256ad8
AJ		 1082
1083static boolean
1084elf64_x86_64_gc_sweep_hook (abfd, info, sec, relocs)
1085 bfd *abfd;
c434dee6 1086 struct bfd_link_info *info;
70256ad8
AJ		 1087 asection *sec;
1088 const Elf_Internal_Rela *relocs;
1089{
1090 Elf_Internal_Shdr *symtab_hdr;
1091 struct elf_link_hash_entry **sym_hashes;
1092 bfd_signed_vma *local_got_refcounts;
1093 const Elf_Internal_Rela *rel, *relend;
1094 unsigned long r_symndx;
bffbf940 1095 int r_type;
70256ad8 1096 struct elf_link_hash_entry *h;
c434dee6
AJ		 1097
1098 elf_section_data (sec)->local_dynrel = NULL;
70256ad8
AJ		 1099
1100 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1101 sym_hashes = elf_sym_hashes (abfd);
1102 local_got_refcounts = elf_local_got_refcounts (abfd);
1103
70256ad8
AJ		 1104 relend = relocs + sec->reloc_count;
1105 for (rel = relocs; rel < relend; rel++)
bffbf940
JJ		 1106 switch ((r_type = elf64_x86_64_tls_transition (info,
1107 ELF64_R_TYPE (rel->r_info),
1108 ELF64_R_SYM (rel->r_info)
1109 >= symtab_hdr->sh_info)))
70256ad8 1110 {
bffbf940
JJ		 1111 case R_X86_64_TLSLD:
1112 if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0)
1113 elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1;
1114 break;
1115
1116 case R_X86_64_TLSGD:
1117 case R_X86_64_GOTTPOFF:
70256ad8
AJ		 1118 case R_X86_64_GOT32:
1119 case R_X86_64_GOTPCREL:
1120 r_symndx = ELF64_R_SYM (rel->r_info);
1121 if (r_symndx >= symtab_hdr->sh_info)
1122 {
1123 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1124 if (h->got.refcount > 0)
c434dee6 1125 h->got.refcount -= 1;
70256ad8
AJ		 1126 }
1127 else if (local_got_refcounts != NULL)
1128 {
1129 if (local_got_refcounts[r_symndx] > 0)
c434dee6 1130 local_got_refcounts[r_symndx] -= 1;
70256ad8
AJ		 1131 }
1132 break;
1133
c434dee6
AJ		 1134 case R_X86_64_8:
1135 case R_X86_64_16:
1136 case R_X86_64_32:
1137 case R_X86_64_64:
1138 case R_X86_64_32S:
1139 case R_X86_64_PC8:
1140 case R_X86_64_PC16:
1141 case R_X86_64_PC32:
1142 r_symndx = ELF64_R_SYM (rel->r_info);
1143 if (r_symndx >= symtab_hdr->sh_info)
1144 {
1145 struct elf64_x86_64_link_hash_entry *eh;
1146 struct elf64_x86_64_dyn_relocs **pp;
1147 struct elf64_x86_64_dyn_relocs *p;
1148
1149 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1150
1151 if (!info->shared && h->plt.refcount > 0)
1152 h->plt.refcount -= 1;
1153
1154 eh = (struct elf64_x86_64_link_hash_entry *) h;
1155
1156 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1157 if (p->sec == sec)
1158 {
1159 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC8
1160 || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC16
1161 || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32)
1162 p->pc_count -= 1;
1163 p->count -= 1;
1164 if (p->count == 0)
1165 *pp = p->next;
1166 break;
1167 }
1168 }
1169 break;
1170
1171
70256ad8
AJ		 1172 case R_X86_64_PLT32:
1173 r_symndx = ELF64_R_SYM (rel->r_info);
1174 if (r_symndx >= symtab_hdr->sh_info)
1175 {
1176 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1177 if (h->plt.refcount > 0)
1178 h->plt.refcount -= 1;
1179 }
1180 break;
1181
1182 default:
1183 break;
1184 }
1185
1186 return true;
1187}
1188
1189/* Adjust a symbol defined by a dynamic object and referenced by a
1190 regular object. The current definition is in some section of the
1191 dynamic object, but we're not including those sections. We have to
1192 change the definition to something the rest of the link can
407443a3 1193 understand. */
70256ad8
AJ		 1194
1195static boolean
1196elf64_x86_64_adjust_dynamic_symbol (info, h)
1197 struct bfd_link_info *info;
1198 struct elf_link_hash_entry *h;
1199{
c434dee6
AJ		 1200 struct elf64_x86_64_link_hash_table *htab;
1201 struct elf64_x86_64_link_hash_entry * eh;
1202 struct elf64_x86_64_dyn_relocs *p;
70256ad8
AJ		 1203 asection *s;
1204 unsigned int power_of_two;
1205
70256ad8
AJ		 1206 /* If this is a function, put it in the procedure linkage table. We
1207 will fill in the contents of the procedure linkage table later,
1208 when we know the address of the .got section. */
1209 if (h->type == STT_FUNC
1210 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1211 {
c434dee6
AJ		 1212 if (h->plt.refcount <= 0
1213 || (! info->shared
1214 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
1215 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
1216 && h->root.type != bfd_link_hash_undefweak
1217 && h->root.type != bfd_link_hash_undefined))
70256ad8 1218 {
70256ad8
AJ		 1219 /* This case can occur if we saw a PLT32 reloc in an input
1220 file, but the symbol was never referred to by a dynamic
1221 object, or if all references were garbage collected. In
1222 such a case, we don't actually need to build a procedure
1223 linkage table, and we can just do a PC32 reloc instead. */
70256ad8
AJ		 1224 h->plt.offset = (bfd_vma) -1;
1225 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
70256ad8
AJ		 1226 }
1227
70256ad8
AJ		 1228 return true;
1229 }
bbd7ec4a 1230 else
c434dee6
AJ		 1231 /* It's possible that we incorrectly decided a .plt reloc was
1232 needed for an R_X86_64_PC32 reloc to a non-function sym in
1233 check_relocs. We can't decide accurately between function and
1234 non-function syms in check-relocs; Objects loaded later in
1235 the link may change h->type. So fix it now. */
bbd7ec4a 1236 h->plt.offset = (bfd_vma) -1;
70256ad8
AJ		 1237
1238 /* If this is a weak symbol, and there is a real definition, the
1239 processor independent code will have arranged for us to see the
407443a3 1240 real definition first, and we can just use the same value. */
70256ad8
AJ		 1241 if (h->weakdef != NULL)
1242 {
1243 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1244 || h->weakdef->root.type == bfd_link_hash_defweak);
1245 h->root.u.def.section = h->weakdef->root.u.def.section;
1246 h->root.u.def.value = h->weakdef->root.u.def.value;
1247 return true;
1248 }
1249
1250 /* This is a reference to a symbol defined by a dynamic object which
407443a3 1251 is not a function. */
70256ad8
AJ		 1252
1253 /* If we are creating a shared library, we must presume that the
1254 only references to the symbol are via the global offset table.
1255 For such cases we need not do anything here; the relocations will
407443a3 1256 be handled correctly by relocate_section. */
70256ad8
AJ		 1257 if (info->shared)
1258 return true;
1259
1260 /* If there are no references to this symbol that do not use the
1261 GOT, we don't need to generate a copy reloc. */
1262 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1263 return true;
1264
c434dee6
AJ		 1265 /* If -z nocopyreloc was given, we won't generate them either. */
1266 if (info->nocopyreloc)
1267 {
1268 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1269 return true;
1270 }
1271
1272 eh = (struct elf64_x86_64_link_hash_entry *) h;
1273 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1274 {
1275 s = p->sec->output_section;
1276 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1277 break;
1278 }
1279
1280 /* If we didn't find any dynamic relocs in read-only sections, then
1281 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1282 if (p == NULL)
1283 {
1284 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1285 return true;
1286 }
1287
70256ad8 1288 /* We must allocate the symbol in our .dynbss section, which will
407443a3 1289 become part of the .bss section of the executable. There will be
70256ad8
AJ		 1290 an entry for this symbol in the .dynsym section. The dynamic
1291 object will contain position independent code, so all references
1292 from the dynamic object to this symbol will go through the global
1293 offset table. The dynamic linker will use the .dynsym entry to
1294 determine the address it must put in the global offset table, so
1295 both the dynamic object and the regular object will refer to the
1296 same memory location for the variable. */
1297
c434dee6 1298 htab = elf64_x86_64_hash_table (info);
70256ad8
AJ		 1299
1300 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1301 to copy the initial value out of the dynamic object and into the
cedb70c5 1302 runtime process image. */
70256ad8
AJ		 1303 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1304 {
c434dee6 1305 htab->srelbss->_raw_size += sizeof (Elf64_External_Rela);
70256ad8
AJ		 1306 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1307 }
1308
1309 /* We need to figure out the alignment required for this symbol. I
407443a3 1310 have no idea how ELF linkers handle this. 16-bytes is the size
70256ad8
AJ		 1311 of the largest type that requires hard alignment -- long double. */
1312 /* FIXME: This is VERY ugly. Should be fixed for all architectures using
1313 this construct. */
1314 power_of_two = bfd_log2 (h->size);
1315 if (power_of_two > 4)
1316 power_of_two = 4;
1317
1318 /* Apply the required alignment. */
c434dee6 1319 s = htab->sdynbss;
70256ad8 1320 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
c434dee6 1321 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
70256ad8 1322 {
c434dee6 1323 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
70256ad8
AJ		 1324 return false;
1325 }
1326
1327 /* Define the symbol as being at this point in the section. */
1328 h->root.u.def.section = s;
1329 h->root.u.def.value = s->_raw_size;
1330
1331 /* Increment the section size to make room for the symbol. */
1332 s->_raw_size += h->size;
1333
1334 return true;
1335}
1336
c434dee6
AJ		 1337/* This is the condition under which elf64_x86_64_finish_dynamic_symbol
1338 will be called from elflink.h. If elflink.h doesn't call our
1339 finish_dynamic_symbol routine, we'll need to do something about
1340 initializing any .plt and .got entries in elf64_x86_64_relocate_section. */
1341#define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \
1342 ((DYN) \
1343 && ((INFO)->shared \
1344 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1345 && ((H)->dynindx != -1 \
1346 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1347
1348/* Allocate space in .plt, .got and associated reloc sections for
1349 dynamic relocs. */
1350
1351static boolean
1352allocate_dynrelocs (h, inf)
1353 struct elf_link_hash_entry *h;
1354 PTR inf;
1355{
1356 struct bfd_link_info *info;
1357 struct elf64_x86_64_link_hash_table *htab;
1358 struct elf64_x86_64_link_hash_entry *eh;
1359 struct elf64_x86_64_dyn_relocs *p;
1360
e92d460e 1361 if (h->root.type == bfd_link_hash_indirect)
c434dee6
AJ		 1362 return true;
1363
e92d460e
AM		 1364 if (h->root.type == bfd_link_hash_warning)
1365 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1366
c434dee6
AJ		 1367 info = (struct bfd_link_info *) inf;
1368 htab = elf64_x86_64_hash_table (info);
1369
1370 if (htab->elf.dynamic_sections_created
1371 && h->plt.refcount > 0)
1372 {
1373 /* Make sure this symbol is output as a dynamic symbol.
1374 Undefined weak syms won't yet be marked as dynamic. */
1375 if (h->dynindx == -1
1376 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1377 {
1378 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1379 return false;
1380 }
1381
1382 if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h))
1383 {
1384 asection *s = htab->splt;
1385
1386 /* If this is the first .plt entry, make room for the special
1387 first entry. */
1388 if (s->_raw_size == 0)
1389 s->_raw_size += PLT_ENTRY_SIZE;
1390
1391 h->plt.offset = s->_raw_size;
1392
1393 /* If this symbol is not defined in a regular file, and we are
1394 not generating a shared library, then set the symbol to this
1395 location in the .plt. This is required to make function
1396 pointers compare as equal between the normal executable and
1397 the shared library. */
1398 if (! info->shared
1399 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1400 {
1401 h->root.u.def.section = s;
1402 h->root.u.def.value = h->plt.offset;
1403 }
1404
1405 /* Make room for this entry. */
1406 s->_raw_size += PLT_ENTRY_SIZE;
1407
1408 /* We also need to make an entry in the .got.plt section, which
1409 will be placed in the .got section by the linker script. */
1410 htab->sgotplt->_raw_size += GOT_ENTRY_SIZE;
1411
1412 /* We also need to make an entry in the .rela.plt section. */
1413 htab->srelplt->_raw_size += sizeof (Elf64_External_Rela);
1414 }
1415 else
1416 {
1417 h->plt.offset = (bfd_vma) -1;
1418 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1419 }
1420 }
1421 else
1422 {
1423 h->plt.offset = (bfd_vma) -1;
1424 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1425 }
1426
bffbf940
JJ		 1427 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1428 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
1429 if (h->got.refcount > 0
1430 && !info->shared
1431 && h->dynindx == -1
1432 && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
1433 h->got.offset = (bfd_vma) -1;
1434 else if (h->got.refcount > 0)
c434dee6
AJ		 1435 {
1436 asection *s;
1437 boolean dyn;
bffbf940 1438 int tls_type = elf64_x86_64_hash_entry (h)->tls_type;
c434dee6
AJ		 1439
1440 /* Make sure this symbol is output as a dynamic symbol.
1441 Undefined weak syms won't yet be marked as dynamic. */
1442 if (h->dynindx == -1
1443 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1444 {
1445 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1446 return false;
1447 }
1448
1449 s = htab->sgot;
1450 h->got.offset = s->_raw_size;
1451 s->_raw_size += GOT_ENTRY_SIZE;
bffbf940
JJ		 1452 /* R_X86_64_TLSGD needs 2 consecutive GOT slots. */
1453 if (tls_type == GOT_TLS_GD)
1454 s->_raw_size += GOT_ENTRY_SIZE;
c434dee6 1455 dyn = htab->elf.dynamic_sections_created;
bffbf940
JJ		 1456 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
1457 and two if global.
1458 R_X86_64_GOTTPOFF needs one dynamic relocation. */
1459 if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1460 || tls_type == GOT_TLS_IE)
1461 htab->srelgot->_raw_size += sizeof (Elf64_External_Rela);
1462 else if (tls_type == GOT_TLS_GD)
1463 htab->srelgot->_raw_size += 2 * sizeof (Elf64_External_Rela);
1464 else if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h))
c434dee6
AJ		 1465 htab->srelgot->_raw_size += sizeof (Elf64_External_Rela);
1466 }
1467 else
1468 h->got.offset = (bfd_vma) -1;
1469
1470 eh = (struct elf64_x86_64_link_hash_entry *) h;
1471 if (eh->dyn_relocs == NULL)
1472 return true;
1473
1474 /* In the shared -Bsymbolic case, discard space allocated for
1475 dynamic pc-relative relocs against symbols which turn out to be
1476 defined in regular objects. For the normal shared case, discard
1477 space for pc-relative relocs that have become local due to symbol
1478 visibility changes. */
1479
1480 if (info->shared)
1481 {
1482 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1483 && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
1484 || info->symbolic))
1485 {
1486 struct elf64_x86_64_dyn_relocs **pp;
1487
1488 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1489 {
1490 p->count -= p->pc_count;
1491 p->pc_count = 0;
1492 if (p->count == 0)
1493 *pp = p->next;
1494 else
1495 pp = &p->next;
1496 }
1497 }
1498 }
1499 else
1500 {
1501 /* For the non-shared case, discard space for relocs against
1502 symbols which turn out to need copy relocs or are not
1503 dynamic. */
1504
1505 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1506 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1507 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1508 || (htab->elf.dynamic_sections_created
1509 && (h->root.type == bfd_link_hash_undefweak
1510 || h->root.type == bfd_link_hash_undefined))))
1511 {
1512 /* Make sure this symbol is output as a dynamic symbol.
1513 Undefined weak syms won't yet be marked as dynamic. */
1514 if (h->dynindx == -1
1515 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1516 {
1517 if (! bfd_elf64_link_record_dynamic_symbol (info, h))
1518 return false;
1519 }
1520
1521 /* If that succeeded, we know we'll be keeping all the
1522 relocs. */
1523 if (h->dynindx != -1)
1524 goto keep;
1525 }
1526
1527 eh->dyn_relocs = NULL;
1528
1529 keep: ;
1530 }
1531
1532 /* Finally, allocate space. */
1533 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1534 {
1535 asection *sreloc = elf_section_data (p->sec)->sreloc;
1536 sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela);
1537 }
1538
1539 return true;
1540}
1541
1542/* Find any dynamic relocs that apply to read-only sections. */
1543
1544static boolean
1545readonly_dynrelocs (h, inf)
1546 struct elf_link_hash_entry *h;
1547 PTR inf;
1548{
1549 struct elf64_x86_64_link_hash_entry *eh;
1550 struct elf64_x86_64_dyn_relocs *p;
1551
e92d460e
AM		 1552 if (h->root.type == bfd_link_hash_warning)
1553 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1554
c434dee6
AJ		 1555 eh = (struct elf64_x86_64_link_hash_entry *) h;
1556 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1557 {
1558 asection *s = p->sec->output_section;
1559
1560 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1561 {
1562 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1563
1564 info->flags |= DF_TEXTREL;
1565
1566 /* Not an error, just cut short the traversal. */
1567 return false;
1568 }
1569 }
1570 return true;
1571}
1572
70256ad8
AJ		 1573/* Set the sizes of the dynamic sections. */
1574
1575static boolean
1576elf64_x86_64_size_dynamic_sections (output_bfd, info)
8df9fc9d 1577 bfd *output_bfd ATTRIBUTE_UNUSED;
70256ad8
AJ		 1578 struct bfd_link_info *info;
1579{
c434dee6 1580 struct elf64_x86_64_link_hash_table *htab;
70256ad8
AJ		 1581 bfd *dynobj;
1582 asection *s;
70256ad8 1583 boolean relocs;
c434dee6 1584 bfd *ibfd;
70256ad8 1585
c434dee6
AJ		 1586 htab = elf64_x86_64_hash_table (info);
1587 dynobj = htab->elf.dynobj;
1588 if (dynobj == NULL)
1589 abort ();
70256ad8 1590
c434dee6 1591 if (htab->elf.dynamic_sections_created)
70256ad8
AJ		 1592 {
1593 /* Set the contents of the .interp section to the interpreter. */
1594 if (! info->shared)
1595 {
1596 s = bfd_get_section_by_name (dynobj, ".interp");
c434dee6
AJ		 1597 if (s == NULL)
1598 abort ();
70256ad8
AJ		 1599 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1600 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1601 }
1602 }
70256ad8 1603
c434dee6
AJ		 1604 /* Set up .got offsets for local syms, and space for local dynamic
1605 relocs. */
1606 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
70256ad8 1607 {
c434dee6
AJ		 1608 bfd_signed_vma *local_got;
1609 bfd_signed_vma *end_local_got;
bffbf940 1610 char *local_tls_type;
c434dee6
AJ		 1611 bfd_size_type locsymcount;
1612 Elf_Internal_Shdr *symtab_hdr;
1613 asection *srel;
70256ad8 1614
c434dee6 1615 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
70256ad8
AJ		 1616 continue;
1617
c434dee6 1618 for (s = ibfd->sections; s != NULL; s = s->next)
70256ad8 1619 {
c434dee6
AJ		 1620 struct elf64_x86_64_dyn_relocs *p;
1621
1622 for (p = *((struct elf64_x86_64_dyn_relocs **)
1623 &elf_section_data (s)->local_dynrel);
1624 p != NULL;
1625 p = p->next)
70256ad8 1626 {
c434dee6
AJ		 1627 if (!bfd_is_abs_section (p->sec)
1628 && bfd_is_abs_section (p->sec->output_section))
1629 {
1630 /* Input section has been discarded, either because
1631 it is a copy of a linkonce section or due to
1632 linker script /DISCARD/, so we'll be discarding
1633 the relocs too. */
1634 }
1635 else if (p->count != 0)
1636 {
1637 srel = elf_section_data (p->sec)->sreloc;
1638 srel->_raw_size += p->count * sizeof (Elf64_External_Rela);
1639 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1640 info->flags |= DF_TEXTREL;
1641
1642 }
70256ad8
AJ		 1643 }
1644 }
c434dee6
AJ		 1645
1646 local_got = elf_local_got_refcounts (ibfd);
1647 if (!local_got)
1648 continue;
1649
1650 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1651 locsymcount = symtab_hdr->sh_info;
1652 end_local_got = local_got + locsymcount;
bffbf940 1653 local_tls_type = elf64_x86_64_local_got_tls_type (ibfd);
c434dee6
AJ		 1654 s = htab->sgot;
1655 srel = htab->srelgot;
bffbf940 1656 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
70256ad8 1657 {
c434dee6 1658 if (*local_got > 0)
70256ad8 1659 {
c434dee6
AJ		 1660 *local_got = s->_raw_size;
1661 s->_raw_size += GOT_ENTRY_SIZE;
bffbf940
JJ		 1662 if (*local_tls_type == GOT_TLS_GD)
1663 s->_raw_size += GOT_ENTRY_SIZE;
1664 if (info->shared
1665 || *local_tls_type == GOT_TLS_GD
1666 || *local_tls_type == GOT_TLS_IE)
c434dee6 1667 srel->_raw_size += sizeof (Elf64_External_Rela);
70256ad8
AJ		 1668 }
1669 else
c434dee6
AJ		 1670 *local_got = (bfd_vma) -1;
1671 }
1672 }
70256ad8 1673
bffbf940
JJ		 1674 if (htab->tls_ld_got.refcount > 0)
1675 {
1676 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
1677 relocs. */
1678 htab->tls_ld_got.offset = htab->sgot->_raw_size;
1679 htab->sgot->_raw_size += 2 * GOT_ENTRY_SIZE;
1680 htab->srelgot->_raw_size += sizeof (Elf64_External_Rela);
1681 }
1682 else
1683 htab->tls_ld_got.offset = -1;
1684
c434dee6
AJ		 1685 /* Allocate global sym .plt and .got entries, and space for global
1686 sym dynamic relocs. */
1687 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1688
1689 /* We now have determined the sizes of the various dynamic sections.
1690 Allocate memory for them. */
1691 relocs = false;
1692 for (s = dynobj->sections; s != NULL; s = s->next)
1693 {
1694 if ((s->flags & SEC_LINKER_CREATED) == 0)
1695 continue;
1696
1697 if (s == htab->splt
1698 || s == htab->sgot
1699 || s == htab->sgotplt)
1700 {
1701 /* Strip this section if we don't need it; see the
1702 comment below. */
1703 }
1704 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
1705 {
1706 if (s->_raw_size != 0 && s != htab->srelplt)
1707 relocs = true;
1708
1709 /* We use the reloc_count field as a counter if we need
1710 to copy relocs into the output file. */
1711 s->reloc_count = 0;
70256ad8 1712 }
c434dee6 1713 else
70256ad8
AJ		 1714 {
1715 /* It's not one of our sections, so don't allocate space. */
1716 continue;
1717 }
1718
c434dee6 1719 if (s->_raw_size == 0)
70256ad8 1720 {
c434dee6
AJ		 1721 /* If we don't need this section, strip it from the
1722 output file. This is mostly to handle .rela.bss and
1723 .rela.plt. We must create both sections in
1724 create_dynamic_sections, because they must be created
1725 before the linker maps input sections to output
1726 sections. The linker does that before
1727 adjust_dynamic_symbol is called, and it is that
1728 function which decides whether anything needs to go
1729 into these sections. */
1730
70256ad8
AJ		 1731 _bfd_strip_section_from_output (info, s);
1732 continue;
1733 }
1734
1735 /* Allocate memory for the section contents. We use bfd_zalloc
1736 here in case unused entries are not reclaimed before the
1737 section's contents are written out. This should not happen,
1738 but this way if it does, we get a R_X86_64_NONE reloc instead
1739 of garbage. */
1740 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
c434dee6 1741 if (s->contents == NULL)
70256ad8
AJ		 1742 return false;
1743 }
1744
c434dee6 1745 if (htab->elf.dynamic_sections_created)
70256ad8
AJ		 1746 {
1747 /* Add some entries to the .dynamic section. We fill in the
1748 values later, in elf64_x86_64_finish_dynamic_sections, but we
1749 must add the entries now so that we get the correct size for
407443a3 1750 the .dynamic section. The DT_DEBUG entry is filled in by the
70256ad8 1751 dynamic linker and used by the debugger. */
dc810e39
AM		 1752#define add_dynamic_entry(TAG, VAL) \
1753 bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
1754
70256ad8
AJ		 1755 if (! info->shared)
1756 {
dc810e39 1757 if (!add_dynamic_entry (DT_DEBUG, 0))
70256ad8
AJ		 1758 return false;
1759 }
1760
c434dee6 1761 if (htab->splt->_raw_size != 0)
70256ad8 1762 {
dc810e39
AM		 1763 if (!add_dynamic_entry (DT_PLTGOT, 0)
1764 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1765 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1766 || !add_dynamic_entry (DT_JMPREL, 0))
70256ad8
AJ		 1767 return false;
1768 }
1769
1770 if (relocs)
1771 {
dc810e39
AM		 1772 if (!add_dynamic_entry (DT_RELA, 0)
1773 || !add_dynamic_entry (DT_RELASZ, 0)
1774 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
70256ad8 1775 return false;
70256ad8 1776
c434dee6
AJ		 1777 /* If any dynamic relocs apply to a read-only section,
1778 then we need a DT_TEXTREL entry. */
1779 if ((info->flags & DF_TEXTREL) == 0)
1780 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1781 (PTR) info);
1782
1783 if ((info->flags & DF_TEXTREL) != 0)
1784 {
1785 if (!add_dynamic_entry (DT_TEXTREL, 0))
1786 return false;
1787 }
70256ad8
AJ		 1788 }
1789 }
dc810e39 1790#undef add_dynamic_entry
70256ad8
AJ		 1791
1792 return true;
1793}
1794
bffbf940
JJ		 1795/* Return the base VMA address which should be subtracted from real addresses
1796 when resolving @dtpoff relocation.
1797 This is PT_TLS segment p_vaddr. */
1798
1799static bfd_vma
1800dtpoff_base (info)
1801 struct bfd_link_info *info;
1802{
1803 /* If tls_segment is NULL, we should have signalled an error already. */
1804 if (elf_hash_table (info)->tls_segment == NULL)
1805 return 0;
1806 return elf_hash_table (info)->tls_segment->start;
1807}
1808
1809/* Return the relocation value for @tpoff relocation
1810 if STT_TLS virtual address is ADDRESS. */
1811
1812static bfd_vma
1813tpoff (info, address)
1814 struct bfd_link_info *info;
1815 bfd_vma address;
1816{
1817 struct elf_link_tls_segment *tls_segment
1818 = elf_hash_table (info)->tls_segment;
1819
1820 /* If tls_segment is NULL, we should have signalled an error already. */
1821 if (tls_segment == NULL)
1822 return 0;
1823 return address - align_power (tls_segment->size, tls_segment->align)
1824 - tls_segment->start;
1825}
1826
8d88c4ca
NC		 1827/* Relocate an x86_64 ELF section. */
1828
1829static boolean
1830elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
fe4770f4 1831 contents, relocs, local_syms, local_sections)
8d88c4ca
NC		 1832 bfd *output_bfd;
1833 struct bfd_link_info *info;
1834 bfd *input_bfd;
1835 asection *input_section;
1836 bfd_byte *contents;
1837 Elf_Internal_Rela *relocs;
1838 Elf_Internal_Sym *local_syms;
1839 asection **local_sections;
1840{
c434dee6 1841 struct elf64_x86_64_link_hash_table *htab;
8d88c4ca
NC		 1842 Elf_Internal_Shdr *symtab_hdr;
1843 struct elf_link_hash_entry **sym_hashes;
1844 bfd_vma *local_got_offsets;
c434dee6 1845 Elf_Internal_Rela *rel;
8d88c4ca
NC		 1846 Elf_Internal_Rela *relend;
1847
b491616a
AM		 1848 if (info->relocateable)
1849 return true;
1850
c434dee6 1851 htab = elf64_x86_64_hash_table (info);
8d88c4ca
NC		 1852 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1853 sym_hashes = elf_sym_hashes (input_bfd);
1854 local_got_offsets = elf_local_got_offsets (input_bfd);
1855
c434dee6 1856 rel = relocs;
8d88c4ca 1857 relend = relocs + input_section->reloc_count;
c434dee6 1858 for (; rel < relend; rel++)
8d88c4ca 1859 {
bffbf940 1860 unsigned int r_type;
8d88c4ca
NC		 1861 reloc_howto_type *howto;
1862 unsigned long r_symndx;
1863 struct elf_link_hash_entry *h;
1864 Elf_Internal_Sym *sym;
1865 asection *sec;
c434dee6 1866 bfd_vma off;
8d88c4ca 1867 bfd_vma relocation;
c434dee6 1868 boolean unresolved_reloc;
8d88c4ca 1869 bfd_reloc_status_type r;
bffbf940 1870 int tls_type;
8d88c4ca 1871
c434dee6 1872 r_type = ELF64_R_TYPE (rel->r_info);
fe4770f4
AJ		 1873 if (r_type == (int) R_X86_64_GNU_VTINHERIT
1874 || r_type == (int) R_X86_64_GNU_VTENTRY)
1875 continue;
8d88c4ca 1876
bffbf940 1877 if (r_type >= R_X86_64_max)
8da6118f
KH		 1878 {
1879 bfd_set_error (bfd_error_bad_value);
1880 return false;
1881 }
8d88c4ca 1882
b491616a 1883 howto = x86_64_elf_howto_table + r_type;
c434dee6 1884 r_symndx = ELF64_R_SYM (rel->r_info);
8d88c4ca
NC		 1885 h = NULL;
1886 sym = NULL;
1887 sec = NULL;
c434dee6 1888 unresolved_reloc = false;
8d88c4ca 1889 if (r_symndx < symtab_hdr->sh_info)
8da6118f
KH		 1890 {
1891 sym = local_syms + r_symndx;
1892 sec = local_sections[r_symndx];
c434dee6
AJ		 1893
1894 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
8da6118f 1895 }
8d88c4ca 1896 else
8da6118f
KH		 1897 {
1898 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1899 while (h->root.type == bfd_link_hash_indirect
1900 || h->root.type == bfd_link_hash_warning)
1901 h = (struct elf_link_hash_entry *) h->root.u.i.link;
c434dee6 1902
8da6118f
KH		 1903 if (h->root.type == bfd_link_hash_defined
1904 || h->root.type == bfd_link_hash_defweak)
1905 {
1906 sec = h->root.u.def.section;
c434dee6 1907 if (sec->output_section == NULL)
8da6118f 1908 {
c434dee6
AJ		 1909 /* Set a flag that will be cleared later if we find a
1910 relocation value for this symbol. output_section
1911 is typically NULL for symbols satisfied by a shared
1912 library. */
1913 unresolved_reloc = true;
8da6118f
KH		 1914 relocation = 0;
1915 }
1916 else
1917 relocation = (h->root.u.def.value
1918 + sec->output_section->vma
1919 + sec->output_offset);
1920 }
1921 else if (h->root.type == bfd_link_hash_undefweak)
1922 relocation = 0;
671bae9c
NC		 1923 else if (info->shared
1924 && (!info->symbolic || info->allow_shlib_undefined)
1925 && !info->no_undefined
70256ad8
AJ		 1926 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1927 relocation = 0;
8da6118f
KH		 1928 else
1929 {
1930 if (! ((*info->callbacks->undefined_symbol)
1931 (info, h->root.root.string, input_bfd,
c434dee6 1932 input_section, rel->r_offset,
8da6118f
KH		 1933 (!info->shared || info->no_undefined
1934 || ELF_ST_VISIBILITY (h->other)))))
1935 return false;
1936 relocation = 0;
1937 }
1938 }
70256ad8
AJ		 1939 /* When generating a shared object, the relocations handled here are
1940 copied into the output file to be resolved at run time. */
1941 switch (r_type)
1942 {
1943 case R_X86_64_GOT32:
1944 /* Relocation is to the entry for this symbol in the global
1945 offset table. */
70256ad8
AJ		 1946 case R_X86_64_GOTPCREL:
1947 /* Use global offset table as symbol value. */
c434dee6
AJ		 1948 if (htab->sgot == NULL)
1949 abort ();
053579d7 1950
51e0a107 1951 if (h != NULL)
70256ad8 1952 {
c434dee6
AJ		 1953 boolean dyn;
1954
1955 off = h->got.offset;
1956 dyn = htab->elf.dynamic_sections_created;
51e0a107 1957
c434dee6 1958 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)
51e0a107 1959 || (info->shared
c434dee6
AJ		 1960 && (info->symbolic
1961 || h->dynindx == -1
1962 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
51e0a107
JH		 1963 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
1964 {
1965 /* This is actually a static link, or it is a -Bsymbolic
1966 link and the symbol is defined locally, or the symbol
407443a3 1967 was forced to be local because of a version file. We
51e0a107
JH		 1968 must initialize this entry in the global offset table.
1969 Since the offset must always be a multiple of 8, we
1970 use the least significant bit to record whether we
1971 have initialized it already.
1972
1973 When doing a dynamic link, we create a .rela.got
407443a3
AJ		 1974 relocation entry to initialize the value. This is
1975 done in the finish_dynamic_symbol routine. */
51e0a107
JH		 1976 if ((off & 1) != 0)
1977 off &= ~1;
1978 else
1979 {
1980 bfd_put_64 (output_bfd, relocation,
c434dee6 1981 htab->sgot->contents + off);
51e0a107
JH		 1982 h->got.offset |= 1;
1983 }
1984 }
053579d7 1985 else
c434dee6 1986 unresolved_reloc = false;
70256ad8 1987 }
51e0a107
JH		 1988 else
1989 {
c434dee6
AJ		 1990 if (local_got_offsets == NULL)
1991 abort ();
51e0a107
JH		 1992
1993 off = local_got_offsets[r_symndx];
1994
1995 /* The offset must always be a multiple of 8. We use
407443a3
AJ		 1996 the least significant bit to record whether we have
1997 already generated the necessary reloc. */
51e0a107
JH		 1998 if ((off & 1) != 0)
1999 off &= ~1;
2000 else
2001 {
c434dee6
AJ		 2002 bfd_put_64 (output_bfd, relocation,
2003 htab->sgot->contents + off);
51e0a107
JH		 2004
2005 if (info->shared)
2006 {
2007 asection *srelgot;
2008 Elf_Internal_Rela outrel;
c434dee6 2009 Elf64_External_Rela *loc;
70256ad8 2010
51e0a107
JH		 2011 /* We need to generate a R_X86_64_RELATIVE reloc
2012 for the dynamic linker. */
c434dee6
AJ		 2013 srelgot = htab->srelgot;
2014 if (srelgot == NULL)
2015 abort ();
51e0a107 2016
c434dee6
AJ		 2017 outrel.r_offset = (htab->sgot->output_section->vma
2018 + htab->sgot->output_offset
51e0a107
JH		 2019 + off);
2020 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
2021 outrel.r_addend = relocation;
c434dee6
AJ		 2022 loc = (Elf64_External_Rela *) srelgot->contents;
2023 loc += srelgot->reloc_count++;
2024 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
51e0a107
JH		 2025 }
2026
2027 local_got_offsets[r_symndx] |= 1;
2028 }
51e0a107 2029 }
6a2bda3f 2030
c434dee6
AJ		 2031 if (off >= (bfd_vma) -2)
2032 abort ();
2033
2034 relocation = htab->sgot->output_offset + off;
2035 if (r_type == R_X86_64_GOTPCREL)
2036 relocation += htab->sgot->output_section->vma;
2037
70256ad8
AJ		 2038 break;
2039
2040 case R_X86_64_PLT32:
2041 /* Relocation is to the entry for this symbol in the
2042 procedure linkage table. */
2043
2044 /* Resolve a PLT32 reloc against a local symbol directly,
407443a3 2045 without using the procedure linkage table. */
70256ad8
AJ		 2046 if (h == NULL)
2047 break;
2048
c434dee6
AJ		 2049 if (h->plt.offset == (bfd_vma) -1
2050 || htab->splt == NULL)
70256ad8
AJ		 2051 {
2052 /* We didn't make a PLT entry for this symbol. This
407443a3
AJ		 2053 happens when statically linking PIC code, or when
2054 using -Bsymbolic. */
70256ad8
AJ		 2055 break;
2056 }
2057
c434dee6
AJ		 2058 relocation = (htab->splt->output_section->vma
2059 + htab->splt->output_offset
70256ad8 2060 + h->plt.offset);
c434dee6 2061 unresolved_reloc = false;
70256ad8
AJ		 2062 break;
2063
fd8ab9e5
AJ		 2064 case R_X86_64_PC8:
2065 case R_X86_64_PC16:
2066 case R_X86_64_PC32:
70256ad8
AJ		 2067 case R_X86_64_8:
2068 case R_X86_64_16:
2069 case R_X86_64_32:
6b3db546 2070 case R_X86_64_64:
80643fbc 2071 /* FIXME: The ABI says the linker should make sure the value is
407443a3 2072 the same when it's zeroextended to 64 bit. */
c434dee6
AJ		 2073
2074 /* r_symndx will be zero only for relocs against symbols
2075 from removed linkonce sections, or sections discarded by
2076 a linker script. */
2077 if (r_symndx == 0
2078 || (input_section->flags & SEC_ALLOC) == 0)
2079 break;
2080
2081 if ((info->shared
2082 && ((r_type != R_X86_64_PC8
2083 && r_type != R_X86_64_PC16
2084 && r_type != R_X86_64_PC32)
2085 || (h != NULL
2086 && h->dynindx != -1
2087 && (! info->symbolic
2088 || (h->elf_link_hash_flags
2089 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
2090 || (!info->shared
2091 && h != NULL
2092 && h->dynindx != -1
2093 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
2094 && (((h->elf_link_hash_flags
2095 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2096 && (h->elf_link_hash_flags
2097 & ELF_LINK_HASH_DEF_REGULAR) == 0)
2098 || h->root.type == bfd_link_hash_undefweak
2099 || h->root.type == bfd_link_hash_undefined)))
70256ad8
AJ		 2100 {
2101 Elf_Internal_Rela outrel;
2102 boolean skip, relocate;
c434dee6
AJ		 2103 asection *sreloc;
2104 Elf64_External_Rela *loc;
70256ad8
AJ		 2105
2106 /* When generating a shared object, these relocations
2107 are copied into the output file to be resolved at run
407443a3 2108 time. */
70256ad8 2109
70256ad8 2110 skip = false;
0bb2d96a 2111 relocate = false;
70256ad8 2112
c629eae0
JJ		 2113 outrel.r_offset =
2114 _bfd_elf_section_offset (output_bfd, info, input_section,
c434dee6 2115 rel->r_offset);
c629eae0
JJ		 2116 if (outrel.r_offset == (bfd_vma) -1)
2117 skip = true;
0fb19cbc 2118 else if (outrel.r_offset == (bfd_vma) -2)
0bb2d96a 2119 skip = true, relocate = true;
70256ad8
AJ		 2120
2121 outrel.r_offset += (input_section->output_section->vma
2122 + input_section->output_offset);
2123
2124 if (skip)
0bb2d96a 2125 memset (&outrel, 0, sizeof outrel);
c434dee6 2126
fd8ab9e5
AJ		 2127 /* h->dynindx may be -1 if this symbol was marked to
2128 become local. */
2129 else if (h != NULL
c434dee6
AJ		 2130 && h->dynindx != -1
2131 && (r_type == R_X86_64_PC8
2132 || r_type == R_X86_64_PC16
2133 || r_type == R_X86_64_PC32
2134 || !info->shared
2135 || !info->symbolic
fd8ab9e5
AJ		 2136 || (h->elf_link_hash_flags
2137 & ELF_LINK_HASH_DEF_REGULAR) == 0))
70256ad8 2138 {
70256ad8 2139 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
c434dee6 2140 outrel.r_addend = rel->r_addend;
70256ad8
AJ		 2141 }
2142 else
2143 {
c434dee6 2144 /* This symbol is local, or marked to become local. */
607c0e09
AS		 2145 if (r_type == R_X86_64_64)
2146 {
2147 relocate = true;
2148 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
2149 outrel.r_addend = relocation + rel->r_addend;
2150 }
2151 else
2152 {
2153 long sindx;
2154
2155 if (h == NULL)
2156 sec = local_sections[r_symndx];
2157 else
2158 {
2159 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2160 || (h->root.type
2161 == bfd_link_hash_defweak));
2162 sec = h->root.u.def.section;
2163 }
2164 if (sec != NULL && bfd_is_abs_section (sec))
2165 sindx = 0;
2166 else if (sec == NULL || sec->owner == NULL)
2167 {
2168 bfd_set_error (bfd_error_bad_value);
2169 return false;
2170 }
2171 else
2172 {
2173 asection *osec;
2174
2175 osec = sec->output_section;
2176 sindx = elf_section_data (osec)->dynindx;
2177 BFD_ASSERT (sindx > 0);
2178 }
2179
2180 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2181 outrel.r_addend = relocation + rel->r_addend;
2182 }
70256ad8
AJ		 2183 }
2184
c434dee6
AJ		 2185 sreloc = elf_section_data (input_section)->sreloc;
2186 if (sreloc == NULL)
2187 abort ();
2188
2189 loc = (Elf64_External_Rela *) sreloc->contents;
2190 loc += sreloc->reloc_count++;
2191 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
70256ad8
AJ		 2192
2193 /* If this reloc is against an external symbol, we do
2194 not want to fiddle with the addend. Otherwise, we
2195 need to include the symbol value so that it becomes
2196 an addend for the dynamic reloc. */
2197 if (! relocate)
2198 continue;
2199 }
2200
2201 break;
2202
bffbf940
JJ		 2203 case R_X86_64_TLSGD:
2204 case R_X86_64_GOTTPOFF:
2205 r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL);
2206 tls_type = GOT_UNKNOWN;
2207 if (h == NULL && local_got_offsets)
2208 tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx];
2209 else if (h != NULL)
2210 {
2211 tls_type = elf64_x86_64_hash_entry (h)->tls_type;
2212 if (!info->shared && h->dynindx == -1 && tls_type == GOT_TLS_IE)
2213 r_type = R_X86_64_TPOFF32;
2214 }
2215 if (r_type == R_X86_64_TLSGD)
2216 {
2217 if (tls_type == GOT_TLS_IE)
2218 r_type = R_X86_64_GOTTPOFF;
2219 }
2220
2221 if (r_type == R_X86_64_TPOFF32)
2222 {
2223 BFD_ASSERT (! unresolved_reloc);
2224 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
2225 {
2226 unsigned int i;
2227 static unsigned char tlsgd[7]
2228 = { 0x66, 0x66, 0x66, 0x66, 0x48, 0x8d, 0x3d };
2229
2230 /* GD->LE transition.
2231 .long 0x66666666; leaq foo@tlsgd(%rip), %rdi
2232 callq __tls_get_addr@plt
2233 Change it into:
2234 movq %fs:0, %rax
2235 leaq foo@tpoff(%rax), %rax */
2236 BFD_ASSERT (rel->r_offset >= 7);
2237 for (i = 0; i < 7; i++)
2238 BFD_ASSERT (bfd_get_8 (input_bfd,
2239 contents + rel->r_offset - 7 + i)
2240 == tlsgd[i]);
2241 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2242 BFD_ASSERT (bfd_get_8 (input_bfd,
2243 contents + rel->r_offset + 4)
2244 == 0xe8);
2245 BFD_ASSERT (rel + 1 < relend);
2246 BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
2247 memcpy (contents + rel->r_offset - 7,
2248 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
2249 16);
2250 bfd_put_32 (output_bfd, tpoff (info, relocation),
2251 contents + rel->r_offset + 5);
2252 /* Skip R_X86_64_PLT32. */
2253 rel++;
2254 continue;
2255 }
2256 else
2257 {
2258 unsigned int val, type, reg;
2259
2260 /* IE->LE transition:
2261 Originally it can be one of:
2262 movq foo@gottpoff(%rip), %reg
2263 addq foo@gottpoff(%rip), %reg
2264 We change it into:
2265 movq $foo, %reg
2266 leaq foo(%reg), %reg
2267 addq $foo, %reg. */
2268 BFD_ASSERT (rel->r_offset >= 3);
2269 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 3);
2270 BFD_ASSERT (val == 0x48 || val == 0x4c);
2271 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2272 BFD_ASSERT (type == 0x8b || type == 0x03);
2273 reg = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2274 BFD_ASSERT ((reg & 0xc7) == 5);
2275 reg >>= 3;
2276 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2277 if (type == 0x8b)
2278 {
2279 /* movq */
2280 if (val == 0x4c)
2281 bfd_put_8 (output_bfd, 0x49,
2282 contents + rel->r_offset - 3);
2283 bfd_put_8 (output_bfd, 0xc7,
2284 contents + rel->r_offset - 2);
2285 bfd_put_8 (output_bfd, 0xc0 | reg,
2286 contents + rel->r_offset - 1);
2287 }
2288 else if (reg == 4)
2289 {
2290 /* addq -> addq - addressing with %rsp/%r12 is
2291 special */
2292 if (val == 0x4c)
2293 bfd_put_8 (output_bfd, 0x49,
2294 contents + rel->r_offset - 3);
2295 bfd_put_8 (output_bfd, 0x81,
2296 contents + rel->r_offset - 2);
2297 bfd_put_8 (output_bfd, 0xc0 | reg,
2298 contents + rel->r_offset - 1);
2299 }
2300 else
2301 {
2302 /* addq -> leaq */
2303 if (val == 0x4c)
2304 bfd_put_8 (output_bfd, 0x4d,
2305 contents + rel->r_offset - 3);
2306 bfd_put_8 (output_bfd, 0x8d,
2307 contents + rel->r_offset - 2);
2308 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
2309 contents + rel->r_offset - 1);
2310 }
2311 bfd_put_32 (output_bfd, tpoff (info, relocation),
2312 contents + rel->r_offset);
2313 continue;
2314 }
2315 }
2316
2317 if (htab->sgot == NULL)
2318 abort ();
2319
2320 if (h != NULL)
2321 off = h->got.offset;
2322 else
2323 {
2324 if (local_got_offsets == NULL)
2325 abort ();
2326
2327 off = local_got_offsets[r_symndx];
2328 }
2329
2330 if ((off & 1) != 0)
2331 off &= ~1;
2332 else
2333 {
2334 Elf_Internal_Rela outrel;
2335 Elf64_External_Rela *loc;
2336 int dr_type, indx;
2337
2338 if (htab->srelgot == NULL)
2339 abort ();
2340
2341 outrel.r_offset = (htab->sgot->output_section->vma
2342 + htab->sgot->output_offset + off);
2343
2344 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2345 if (r_type == R_X86_64_TLSGD)
2346 dr_type = R_X86_64_DTPMOD64;
2347 else
2348 dr_type = R_X86_64_TPOFF64;
2349
2350 bfd_put_64 (output_bfd, 0, htab->sgot->contents + off);
2351 outrel.r_addend = 0;
2352 if (dr_type == R_X86_64_TPOFF64 && indx == 0)
2353 outrel.r_addend = relocation - dtpoff_base (info);
2354 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2355
2356 loc = (Elf64_External_Rela *) htab->srelgot->contents;
2357 loc += htab->srelgot->reloc_count++;
2358 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2359
2360 if (r_type == R_X86_64_TLSGD)
2361 {
2362 if (indx == 0)
2363 {
2364 BFD_ASSERT (! unresolved_reloc);
2365 bfd_put_64 (output_bfd,
2366 relocation - dtpoff_base (info),
2367 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2368 }
2369 else
2370 {
2371 bfd_put_64 (output_bfd, 0,
2372 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2373 outrel.r_info = ELF64_R_INFO (indx,
2374 R_X86_64_DTPOFF64);
2375 outrel.r_offset += GOT_ENTRY_SIZE;
2376 htab->srelgot->reloc_count++;
2377 loc++;
2378 bfd_elf64_swap_reloca_out (output_bfd, &outrel,
2379 loc);
2380 }
2381 }
2382
2383 if (h != NULL)
2384 h->got.offset |= 1;
2385 else
2386 local_got_offsets[r_symndx] |= 1;
2387 }
2388
2389 if (off >= (bfd_vma) -2)
2390 abort ();
2391 if (r_type == ELF64_R_TYPE (rel->r_info))
2392 {
2393 relocation = htab->sgot->output_section->vma
2394 + htab->sgot->output_offset + off;
2395 unresolved_reloc = false;
2396 }
2397 else
2398 {
2399 unsigned int i;
2400 static unsigned char tlsgd[7]
2401 = { 0x66, 0x66, 0x66, 0x66, 0x48, 0x8d, 0x3d };
2402
2403 /* GD->IE transition.
2404 .long 0x66666666; leaq foo@tlsgd(%rip), %rdi
2405 callq __tls_get_addr@plt
2406 Change it into:
2407 movq %fs:0, %rax
2408 addq foo@gottpoff(%rip), %rax */
2409 BFD_ASSERT (rel->r_offset >= 7);
2410 for (i = 0; i < 7; i++)
2411 BFD_ASSERT (bfd_get_8 (input_bfd,
2412 contents + rel->r_offset - 7 + i)
2413 == tlsgd[i]);
2414 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2415 BFD_ASSERT (bfd_get_8 (input_bfd,
2416 contents + rel->r_offset + 4)
2417 == 0xe8);
2418 BFD_ASSERT (rel + 1 < relend);
2419 BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
2420 memcpy (contents + rel->r_offset - 7,
2421 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
2422 16);
2423
2424 relocation = (htab->sgot->output_section->vma
2425 + htab->sgot->output_offset + off
2426 - rel->r_offset
2427 - input_section->output_section->vma
2428 - input_section->output_offset
2429 - 9);
2430 bfd_put_32 (output_bfd, relocation,
2431 contents + rel->r_offset + 5);
2432 /* Skip R_X86_64_PLT32. */
2433 rel++;
2434 continue;
2435 }
2436 break;
2437
2438 case R_X86_64_TLSLD:
2439 if (! info->shared)
2440 {
2441 /* LD->LE transition:
2442 Ensure it is:
2443 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr@plt.
2444 We change it into:
2445 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
2446 BFD_ASSERT (rel->r_offset >= 3);
2447 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 3)
2448 == 0x48);
2449 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2450 == 0x8d);
2451 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 1)
2452 == 0x3d);
2453 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2454 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2455 == 0xe8);
2456 BFD_ASSERT (rel + 1 < relend);
2457 BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
2458 memcpy (contents + rel->r_offset - 3,
2459 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
2460 /* Skip R_X86_64_PLT32. */
2461 rel++;
2462 continue;
2463 }
2464
2465 if (htab->sgot == NULL)
2466 abort ();
2467
2468 off = htab->tls_ld_got.offset;
2469 if (off & 1)
2470 off &= ~1;
2471 else
2472 {
2473 Elf_Internal_Rela outrel;
2474 Elf64_External_Rela *loc;
2475
2476 if (htab->srelgot == NULL)
2477 abort ();
2478
2479 outrel.r_offset = (htab->sgot->output_section->vma
2480 + htab->sgot->output_offset + off);
2481
2482 bfd_put_64 (output_bfd, 0,
2483 htab->sgot->contents + off);
2484 bfd_put_64 (output_bfd, 0,
2485 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2486 outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64);
2487 outrel.r_addend = 0;
2488 loc = (Elf64_External_Rela *) htab->srelgot->contents;
2489 loc += htab->srelgot->reloc_count++;
2490 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2491 htab->tls_ld_got.offset |= 1;
2492 }
2493 relocation = htab->sgot->output_section->vma
2494 + htab->sgot->output_offset + off;
2495 unresolved_reloc = false;
2496 break;
2497
2498 case R_X86_64_DTPOFF32:
2499 if (info->shared)
2500 relocation -= dtpoff_base (info);
2501 else
2502 relocation = tpoff (info, relocation);
2503 break;
2504
2505 case R_X86_64_TPOFF32:
2506 BFD_ASSERT (! info->shared);
2507 relocation = tpoff (info, relocation);
2508 break;
2509
70256ad8
AJ		 2510 default:
2511 break;
2512 }
8d88c4ca 2513
239e1f3a
AM		 2514 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2515 because such sections are not SEC_ALLOC and thus ld.so will
2516 not process them. */
c434dee6 2517 if (unresolved_reloc
239e1f3a 2518 && !((input_section->flags & SEC_DEBUGGING) != 0
c434dee6
AJ		 2519 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
2520 (*_bfd_error_handler)
2521 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
2522 bfd_archive_filename (input_bfd),
2523 bfd_get_section_name (input_bfd, input_section),
2524 (long) rel->r_offset,
2525 h->root.root.string);
2526
8d88c4ca 2527 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
c434dee6
AJ		 2528 contents, rel->r_offset,
2529 relocation, rel->r_addend);
8d88c4ca
NC		 2530
2531 if (r != bfd_reloc_ok)
8da6118f 2532 {
c434dee6
AJ		 2533 const char *name;
2534
2535 if (h != NULL)
2536 name = h->root.root.string;
2537 else
8da6118f 2538 {
c434dee6
AJ		 2539 name = bfd_elf_string_from_elf_section (input_bfd,
2540 symtab_hdr->sh_link,
2541 sym->st_name);
2542 if (name == NULL)
2543 return false;
2544 if (*name == '\0')
2545 name = bfd_section_name (input_bfd, sec);
2546 }
2547
2548 if (r == bfd_reloc_overflow)
2549 {
2550
2551 if (! ((*info->callbacks->reloc_overflow)
2552 (info, name, howto->name, (bfd_vma) 0,
2553 input_bfd, input_section, rel->r_offset)))
2554 return false;
2555 }
2556 else
2557 {
2558 (*_bfd_error_handler)
2559 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
2560 bfd_archive_filename (input_bfd),
2561 bfd_get_section_name (input_bfd, input_section),
2562 (long) rel->r_offset, name, (int) r);
2563 return false;
8da6118f
KH		 2564 }
2565 }
8d88c4ca 2566 }
70256ad8
AJ		 2567
2568 return true;
2569}
2570
2571/* Finish up dynamic symbol handling. We set the contents of various
2572 dynamic sections here. */
2573
2574static boolean
2575elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym)
2576 bfd *output_bfd;
2577 struct bfd_link_info *info;
2578 struct elf_link_hash_entry *h;
2579 Elf_Internal_Sym *sym;
2580{
c434dee6 2581 struct elf64_x86_64_link_hash_table *htab;
70256ad8 2582
c434dee6 2583 htab = elf64_x86_64_hash_table (info);
70256ad8
AJ		 2584
2585 if (h->plt.offset != (bfd_vma) -1)
2586 {
70256ad8
AJ		 2587 bfd_vma plt_index;
2588 bfd_vma got_offset;
2589 Elf_Internal_Rela rela;
c434dee6 2590 Elf64_External_Rela *loc;
70256ad8
AJ		 2591
2592 /* This symbol has an entry in the procedure linkage table. Set
407443a3 2593 it up. */
70256ad8 2594
c434dee6
AJ		 2595 if (h->dynindx == -1
2596 || htab->splt == NULL
2597 || htab->sgotplt == NULL
2598 || htab->srelplt == NULL)
2599 abort ();
70256ad8
AJ		 2600
2601 /* Get the index in the procedure linkage table which
2602 corresponds to this symbol. This is the index of this symbol
2603 in all the symbols for which we are making plt entries. The
2604 first entry in the procedure linkage table is reserved. */
2605 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2606
2607 /* Get the offset into the .got table of the entry that
407443a3 2608 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
fe4770f4 2609 bytes. The first three are reserved for the dynamic linker. */
70256ad8
AJ		 2610 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
2611
2612 /* Fill in the entry in the procedure linkage table. */
c434dee6 2613 memcpy (htab->splt->contents + h->plt.offset, elf64_x86_64_plt_entry,
70256ad8
AJ		 2614 PLT_ENTRY_SIZE);
2615
2616 /* Insert the relocation positions of the plt section. The magic
2617 numbers at the end of the statements are the positions of the
2618 relocations in the plt section. */
653165cc
AJ		 2619 /* Put offset for jmp *name@GOTPCREL(%rip), since the
2620 instruction uses 6 bytes, subtract this value. */
2621 bfd_put_32 (output_bfd,
c434dee6
AJ		 2622 (htab->sgotplt->output_section->vma
2623 + htab->sgotplt->output_offset
653165cc 2624 + got_offset
c434dee6
AJ		 2625 - htab->splt->output_section->vma
2626 - htab->splt->output_offset
653165cc
AJ		 2627 - h->plt.offset
2628 - 6),
c434dee6 2629 htab->splt->contents + h->plt.offset + 2);
653165cc
AJ		 2630 /* Put relocation index. */
2631 bfd_put_32 (output_bfd, plt_index,
c434dee6 2632 htab->splt->contents + h->plt.offset + 7);
653165cc
AJ		 2633 /* Put offset for jmp .PLT0. */
2634 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
c434dee6 2635 htab->splt->contents + h->plt.offset + 12);
70256ad8 2636
653165cc
AJ		 2637 /* Fill in the entry in the global offset table, initially this
2638 points to the pushq instruction in the PLT which is at offset 6. */
c434dee6
AJ		 2639 bfd_put_64 (output_bfd, (htab->splt->output_section->vma
2640 + htab->splt->output_offset
70256ad8 2641 + h->plt.offset + 6),
c434dee6 2642 htab->sgotplt->contents + got_offset);
70256ad8
AJ		 2643
2644 /* Fill in the entry in the .rela.plt section. */
c434dee6
AJ		 2645 rela.r_offset = (htab->sgotplt->output_section->vma
2646 + htab->sgotplt->output_offset
70256ad8
AJ		 2647 + got_offset);
2648 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
2649 rela.r_addend = 0;
c434dee6
AJ		 2650 loc = (Elf64_External_Rela *) htab->srelplt->contents + plt_index;
2651 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
70256ad8
AJ		 2652
2653 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2654 {
2655 /* Mark the symbol as undefined, rather than as defined in
c434dee6
AJ		 2656 the .plt section. Leave the value alone. This is a clue
2657 for the dynamic linker, to make function pointer
2658 comparisons work between an application and shared
2659 library. */
70256ad8
AJ		 2660 sym->st_shndx = SHN_UNDEF;
2661 }
2662 }
2663
bffbf940
JJ		 2664 if (h->got.offset != (bfd_vma) -1
2665 && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_GD
2666 && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
053579d7 2667 {
053579d7 2668 Elf_Internal_Rela rela;
c434dee6 2669 Elf64_External_Rela *loc;
053579d7
AJ		 2670
2671 /* This symbol has an entry in the global offset table. Set it
bffbf940 2672 up. */
053579d7 2673
c434dee6
AJ		 2674 if (htab->sgot == NULL || htab->srelgot == NULL)
2675 abort ();
053579d7 2676
c434dee6
AJ		 2677 rela.r_offset = (htab->sgot->output_section->vma
2678 + htab->sgot->output_offset
dc810e39 2679 + (h->got.offset &~ (bfd_vma) 1));
053579d7
AJ		 2680
2681 /* If this is a static link, or it is a -Bsymbolic link and the
2682 symbol is defined locally or was forced to be local because
2683 of a version file, we just want to emit a RELATIVE reloc.
2684 The entry in the global offset table will already have been
2685 initialized in the relocate_section function. */
c434dee6
AJ		 2686 if (info->shared
2687 && (info->symbolic
2688 || h->dynindx == -1
2689 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
2690 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
053579d7 2691 {
cc78d0af 2692 BFD_ASSERT((h->got.offset & 1) != 0);
053579d7
AJ		 2693 rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
2694 rela.r_addend = (h->root.u.def.value
2695 + h->root.u.def.section->output_section->vma
2696 + h->root.u.def.section->output_offset);
2697 }
2698 else
2699 {
2700 BFD_ASSERT((h->got.offset & 1) == 0);
c434dee6
AJ		 2701 bfd_put_64 (output_bfd, (bfd_vma) 0,
2702 htab->sgot->contents + h->got.offset);
053579d7
AJ		 2703 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT);
2704 rela.r_addend = 0;
2705 }
2706
c434dee6
AJ		 2707 loc = (Elf64_External_Rela *) htab->srelgot->contents;
2708 loc += htab->srelgot->reloc_count++;
2709 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
053579d7
AJ		 2710 }
2711
70256ad8
AJ		 2712 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
2713 {
70256ad8 2714 Elf_Internal_Rela rela;
c434dee6 2715 Elf64_External_Rela *loc;
70256ad8
AJ		 2716
2717 /* This symbol needs a copy reloc. Set it up. */
2718
c434dee6
AJ		 2719 if (h->dynindx == -1
2720 || (h->root.type != bfd_link_hash_defined
2721 && h->root.type != bfd_link_hash_defweak)
2722 || htab->srelbss == NULL)
2723 abort ();
70256ad8
AJ		 2724
2725 rela.r_offset = (h->root.u.def.value
2726 + h->root.u.def.section->output_section->vma
2727 + h->root.u.def.section->output_offset);
2728 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
2729 rela.r_addend = 0;
c434dee6
AJ		 2730 loc = (Elf64_External_Rela *) htab->srelbss->contents;
2731 loc += htab->srelbss->reloc_count++;
2732 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
70256ad8
AJ		 2733 }
2734
2735 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2736 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
2737 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
2738 sym->st_shndx = SHN_ABS;
2739
2740 return true;
2741}
2742
c434dee6
AJ		 2743/* Used to decide how to sort relocs in an optimal manner for the
2744 dynamic linker, before writing them out. */
2745
2746static enum elf_reloc_type_class
2747elf64_x86_64_reloc_type_class (rela)
2748 const Elf_Internal_Rela *rela;
2749{
2750 switch ((int) ELF64_R_TYPE (rela->r_info))
2751 {
2752 case R_X86_64_RELATIVE:
2753 return reloc_class_relative;
2754 case R_X86_64_JUMP_SLOT:
2755 return reloc_class_plt;
2756 case R_X86_64_COPY:
2757 return reloc_class_copy;
2758 default:
2759 return reloc_class_normal;
2760 }
2761}
2762
70256ad8
AJ		 2763/* Finish up the dynamic sections. */
2764
2765static boolean
2766elf64_x86_64_finish_dynamic_sections (output_bfd, info)
2767 bfd *output_bfd;
2768 struct bfd_link_info *info;
2769{
c434dee6 2770 struct elf64_x86_64_link_hash_table *htab;
70256ad8
AJ		 2771 bfd *dynobj;
2772 asection *sdyn;
70256ad8 2773
c434dee6
AJ		 2774 htab = elf64_x86_64_hash_table (info);
2775 dynobj = htab->elf.dynobj;
70256ad8
AJ		 2776 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
2777
c434dee6 2778 if (htab->elf.dynamic_sections_created)
70256ad8 2779 {
70256ad8
AJ		 2780 Elf64_External_Dyn *dyncon, *dynconend;
2781
c434dee6
AJ		 2782 if (sdyn == NULL || htab->sgot == NULL)
2783 abort ();
70256ad8
AJ		 2784
2785 dyncon = (Elf64_External_Dyn *) sdyn->contents;
2786 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
2787 for (; dyncon < dynconend; dyncon++)
2788 {
2789 Elf_Internal_Dyn dyn;
70256ad8
AJ		 2790 asection *s;
2791
2792 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
2793
2794 switch (dyn.d_tag)
2795 {
2796 default:
053579d7 2797 continue;
70256ad8
AJ		 2798
2799 case DT_PLTGOT:
c434dee6
AJ		 2800 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
2801 break;
70256ad8
AJ		 2802
2803 case DT_JMPREL:
c434dee6
AJ		 2804 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
2805 break;
70256ad8 2806
c434dee6
AJ		 2807 case DT_PLTRELSZ:
2808 s = htab->srelplt->output_section;
2809 if (s->_cooked_size != 0)
2810 dyn.d_un.d_val = s->_cooked_size;
2811 else
2812 dyn.d_un.d_val = s->_raw_size;
70256ad8
AJ		 2813 break;
2814
2815 case DT_RELASZ:
c434dee6
AJ		 2816 /* The procedure linkage table relocs (DT_JMPREL) should
2817 not be included in the overall relocs (DT_RELA).
2818 Therefore, we override the DT_RELASZ entry here to
2819 make it not include the JMPREL relocs. Since the
2820 linker script arranges for .rela.plt to follow all
2821 other relocation sections, we don't have to worry
2822 about changing the DT_RELA entry. */
2823 if (htab->srelplt != NULL)
70256ad8 2824 {
c434dee6
AJ		 2825 s = htab->srelplt->output_section;
2826 if (s->_cooked_size != 0)
2827 dyn.d_un.d_val -= s->_cooked_size;
2828 else
2829 dyn.d_un.d_val -= s->_raw_size;
70256ad8
AJ		 2830 }
2831 break;
70256ad8 2832 }
c434dee6 2833
70256ad8
AJ		 2834 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
2835 }
2836
c434dee6
AJ		 2837 /* Fill in the special first entry in the procedure linkage table. */
2838 if (htab->splt && htab->splt->_raw_size > 0)
70256ad8 2839 {
653165cc 2840 /* Fill in the first entry in the procedure linkage table. */
c434dee6
AJ		 2841 memcpy (htab->splt->contents, elf64_x86_64_plt0_entry,
2842 PLT_ENTRY_SIZE);
653165cc
AJ		 2843 /* Add offset for pushq GOT+8(%rip), since the instruction
2844 uses 6 bytes subtract this value. */
2845 bfd_put_32 (output_bfd,
c434dee6
AJ		 2846 (htab->sgotplt->output_section->vma
2847 + htab->sgotplt->output_offset
653165cc 2848 + 8
c434dee6
AJ		 2849 - htab->splt->output_section->vma
2850 - htab->splt->output_offset
653165cc 2851 - 6),
c434dee6 2852 htab->splt->contents + 2);
653165cc
AJ		 2853 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
2854 the end of the instruction. */
2855 bfd_put_32 (output_bfd,
c434dee6
AJ		 2856 (htab->sgotplt->output_section->vma
2857 + htab->sgotplt->output_offset
653165cc 2858 + 16
c434dee6
AJ		 2859 - htab->splt->output_section->vma
2860 - htab->splt->output_offset
653165cc 2861 - 12),
c434dee6 2862 htab->splt->contents + 8);
653165cc 2863
c434dee6
AJ		 2864 elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize =
2865 PLT_ENTRY_SIZE;
70256ad8 2866 }
70256ad8
AJ		 2867 }
2868
c434dee6 2869 if (htab->sgotplt)
70256ad8 2870 {
c434dee6
AJ		 2871 /* Fill in the first three entries in the global offset table. */
2872 if (htab->sgotplt->_raw_size > 0)
2873 {
2874 /* Set the first entry in the global offset table to the address of
2875 the dynamic section. */
2876 if (sdyn == NULL)
2877 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents);
2878 else
2879 bfd_put_64 (output_bfd,
2880 sdyn->output_section->vma + sdyn->output_offset,
2881 htab->sgotplt->contents);
2882 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
2883 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE);
2884 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2);
2885 }
70256ad8 2886
c434dee6
AJ		 2887 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize =
2888 GOT_ENTRY_SIZE;
2889 }
70256ad8 2890
8d88c4ca
NC		 2891 return true;
2892}
2893
8df9fc9d 2894
70256ad8
AJ		 2895#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
2896#define TARGET_LITTLE_NAME "elf64-x86-64"
2897#define ELF_ARCH bfd_arch_i386
2898#define ELF_MACHINE_CODE EM_X86_64
2899#define ELF_MAXPAGESIZE 0x100000
2900
2901#define elf_backend_can_gc_sections 1
51b64d56 2902#define elf_backend_can_refcount 1
70256ad8
AJ		 2903#define elf_backend_want_got_plt 1
2904#define elf_backend_plt_readonly 1
2905#define elf_backend_want_plt_sym 0
2906#define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
2907#define elf_backend_plt_header_size PLT_ENTRY_SIZE
b491616a 2908#define elf_backend_rela_normal 1
70256ad8
AJ		 2909
2910#define elf_info_to_howto elf64_x86_64_info_to_howto
70256ad8 2911
70256ad8
AJ		 2912#define bfd_elf64_bfd_link_hash_table_create \
2913 elf64_x86_64_link_hash_table_create
407443a3 2914#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
70256ad8
AJ		 2915
2916#define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
2917#define elf_backend_check_relocs elf64_x86_64_check_relocs
c434dee6
AJ		 2918#define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
2919#define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
2920#define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
70256ad8
AJ		 2921#define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
2922#define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
2923#define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
3bab7989
ML		 2924#define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
2925#define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
c434dee6 2926#define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
70256ad8
AJ		 2927#define elf_backend_relocate_section elf64_x86_64_relocate_section
2928#define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
407443a3 2929#define elf_backend_object_p elf64_x86_64_elf_object_p
bffbf940 2930#define bfd_elf64_mkobject elf64_x86_64_mkobject
8d88c4ca
NC		 2931
2932#include "elf64-target.h"
GDB Binutils - Deliverables
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