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2009-06-13 H.J. Lu <hongjiu.lu@intel.com>
[thirdparty/binutils-gdb.git] / bfd / elf64-x86-64.c
CommitLineData
8d88c4ca 1/* X86-64 specific support for 64-bit ELF
0ffa91dd 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
3eb128b2 3 Free Software Foundation, Inc.
8d88c4ca
NC		 4 Contributed by Jan Hubicka <jh@suse.cz>.
5
ae9a127f 6 This file is part of BFD, the Binary File Descriptor library.
8d88c4ca 7
ae9a127f
NC		 8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
cd123cb7 10 the Free Software Foundation; either version 3 of the License, or
ae9a127f 11 (at your option) any later version.
8d88c4ca 12
ae9a127f
NC		 13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
8d88c4ca 17
ae9a127f
NC		 18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
cd123cb7
NC		 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
8d88c4ca 22
8d88c4ca 23#include "sysdep.h"
3db64b00 24#include "bfd.h"
c434dee6 25#include "bfdlink.h"
8d88c4ca
NC		 26#include "libbfd.h"
27#include "elf-bfd.h"
142411ca 28#include "bfd_stdint.h"
c25bc9fc
L		 29#include "objalloc.h"
30#include "hashtab.h"
8d88c4ca
NC		 31
32#include "elf/x86-64.h"
33
8d88c4ca
NC		 34/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
35#define MINUS_ONE (~ (bfd_vma) 0)
36
37/* The relocation "howto" table. Order of fields:
7b81dfbb
AJ		 38 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
39 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
70256ad8
AJ		 40static reloc_howto_type x86_64_elf_howto_table[] =
41{
b34976b6
AM		 42 HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
43 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
44 FALSE),
45 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
47 FALSE),
48 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
49 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
50 TRUE),
51 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
52 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
53 FALSE),
54 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
55 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
56 TRUE),
57 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
59 FALSE),
60 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
62 MINUS_ONE, FALSE),
63 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
65 MINUS_ONE, FALSE),
66 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
68 MINUS_ONE, FALSE),
69 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
70 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
71 0xffffffff, TRUE),
72 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
73 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
74 FALSE),
75 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
76 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
77 FALSE),
78 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
b0360d8c 80 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
b34976b6 81 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
ac2aa337 82 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
b34976b6
AM		 83 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
84 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
85 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
86 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
88 MINUS_ONE, FALSE),
89 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
91 MINUS_ONE, FALSE),
92 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
94 MINUS_ONE, FALSE),
95 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
96 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
97 0xffffffff, TRUE),
98 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
99 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
100 0xffffffff, TRUE),
ac2aa337 101 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
b34976b6
AM		 102 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
103 0xffffffff, FALSE),
104 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
105 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
106 0xffffffff, TRUE),
107 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
108 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
109 0xffffffff, FALSE),
d6ab8113
JB		 110 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
112 TRUE),
113 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
115 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
116 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
117 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
118 FALSE, 0xffffffff, 0xffffffff, TRUE),
7b81dfbb
AJ		 119 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
120 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
121 FALSE),
122 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
123 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
124 MINUS_ONE, TRUE),
125 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
126 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
127 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
128 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
129 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
130 MINUS_ONE, FALSE),
131 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
132 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
133 MINUS_ONE, FALSE),
67a4f2b7
AO		 134 EMPTY_HOWTO (32),
135 EMPTY_HOWTO (33),
136 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
137 complain_overflow_bitfield, bfd_elf_generic_reloc,
138 "R_X86_64_GOTPC32_TLSDESC",
139 FALSE, 0xffffffff, 0xffffffff, TRUE),
140 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
141 complain_overflow_dont, bfd_elf_generic_reloc,
142 "R_X86_64_TLSDESC_CALL",
143 FALSE, 0, 0, FALSE),
144 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
145 complain_overflow_bitfield, bfd_elf_generic_reloc,
146 "R_X86_64_TLSDESC",
147 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
cbe950e9
L		 148 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
150 MINUS_ONE, FALSE),
fe4770f4 151
a33d77bc
JB		 152 /* We have a gap in the reloc numbers here.
153 R_X86_64_standard counts the number up to this point, and
154 R_X86_64_vt_offset is the value to subtract from a reloc type of
155 R_X86_64_GNU_VT* to form an index into this table. */
cbe950e9 156#define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
a33d77bc
JB		 157#define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
158
fe4770f4 159/* GNU extension to record C++ vtable hierarchy. */
b34976b6
AM		 160 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
161 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
fe4770f4
AJ		 162
163/* GNU extension to record C++ vtable member usage. */
b34976b6
AM		 164 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
165 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
166 FALSE)
8d88c4ca
NC		 167};
168
d8045f23
NC		 169#define IS_X86_64_PCREL_TYPE(TYPE) \
170 ( ((TYPE) == R_X86_64_PC8) \
171 || ((TYPE) == R_X86_64_PC16) \
172 || ((TYPE) == R_X86_64_PC32) \
173 || ((TYPE) == R_X86_64_PC64))
174
8d88c4ca 175/* Map BFD relocs to the x86_64 elf relocs. */
70256ad8
AJ		 176struct elf_reloc_map
177{
8d88c4ca
NC		 178 bfd_reloc_code_real_type bfd_reloc_val;
179 unsigned char elf_reloc_val;
180};
181
dc810e39 182static const struct elf_reloc_map x86_64_reloc_map[] =
8d88c4ca 183{
70256ad8
AJ		 184 { BFD_RELOC_NONE, R_X86_64_NONE, },
185 { BFD_RELOC_64, R_X86_64_64, },
186 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
187 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
188 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
189 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
190 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
191 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
192 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
193 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
194 { BFD_RELOC_32, R_X86_64_32, },
195 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
196 { BFD_RELOC_16, R_X86_64_16, },
197 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
198 { BFD_RELOC_8, R_X86_64_8, },
199 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
bffbf940
JJ		 200 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
201 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
202 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
203 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
204 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
205 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
206 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
207 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
d6ab8113
JB		 208 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
209 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
210 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
7b81dfbb
AJ		 211 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
212 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
213 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
214 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
215 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
67a4f2b7
AO		 216 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
217 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
218 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
cbe950e9 219 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
fe4770f4
AJ		 220 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
221 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
8d88c4ca
NC		 222};
223
67a4f2b7
AO		 224static reloc_howto_type *
225elf64_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
226{
227 unsigned i;
228
229 if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
230 || r_type >= (unsigned int) R_X86_64_max)
231 {
232 if (r_type >= (unsigned int) R_X86_64_standard)
233 {
234 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
235 abfd, (int) r_type);
236 r_type = R_X86_64_NONE;
237 }
238 i = r_type;
239 }
240 else
241 i = r_type - (unsigned int) R_X86_64_vt_offset;
242 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
243 return &x86_64_elf_howto_table[i];
244}
8d88c4ca
NC		 245
246/* Given a BFD reloc type, return a HOWTO structure. */
247static reloc_howto_type *
67a4f2b7 248elf64_x86_64_reloc_type_lookup (bfd *abfd,
27482721 249 bfd_reloc_code_real_type code)
8d88c4ca
NC		 250{
251 unsigned int i;
27482721 252
8d88c4ca
NC		 253 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
254 i++)
255 {
256 if (x86_64_reloc_map[i].bfd_reloc_val == code)
67a4f2b7
AO		 257 return elf64_x86_64_rtype_to_howto (abfd,
258 x86_64_reloc_map[i].elf_reloc_val);
8d88c4ca
NC		 259 }
260 return 0;
261}
262
157090f7
AM		 263static reloc_howto_type *
264elf64_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
265 const char *r_name)
266{
267 unsigned int i;
268
269 for (i = 0;
270 i < (sizeof (x86_64_elf_howto_table)
271 / sizeof (x86_64_elf_howto_table[0]));
272 i++)
273 if (x86_64_elf_howto_table[i].name != NULL
274 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
275 return &x86_64_elf_howto_table[i];
276
277 return NULL;
278}
279
8d88c4ca 280/* Given an x86_64 ELF reloc type, fill in an arelent structure. */
8da6118f 281
8d88c4ca 282static void
27482721
AJ		 283elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
284 Elf_Internal_Rela *dst)
8d88c4ca 285{
67a4f2b7 286 unsigned r_type;
8d88c4ca
NC		 287
288 r_type = ELF64_R_TYPE (dst->r_info);
67a4f2b7 289 cache_ptr->howto = elf64_x86_64_rtype_to_howto (abfd, r_type);
8d88c4ca
NC		 290 BFD_ASSERT (r_type == cache_ptr->howto->type);
291}
70256ad8 292\f
3bab7989 293/* Support for core dump NOTE sections. */
b34976b6 294static bfd_boolean
27482721 295elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
3bab7989
ML		 296{
297 int offset;
eea6121a 298 size_t size;
3bab7989
ML		 299
300 switch (note->descsz)
301 {
302 default:
b34976b6 303 return FALSE;
3bab7989
ML		 304
305 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
306 /* pr_cursig */
cedb70c5 307 elf_tdata (abfd)->core_signal
3bab7989
ML		 308 = bfd_get_16 (abfd, note->descdata + 12);
309
310 /* pr_pid */
cedb70c5 311 elf_tdata (abfd)->core_pid
3bab7989
ML		 312 = bfd_get_32 (abfd, note->descdata + 32);
313
314 /* pr_reg */
315 offset = 112;
eea6121a 316 size = 216;
3bab7989
ML		 317
318 break;
319 }
320
321 /* Make a ".reg/999" section. */
322 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
eea6121a 323 size, note->descpos + offset);
3bab7989
ML		 324}
325
b34976b6 326static bfd_boolean
27482721 327elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
3bab7989
ML		 328{
329 switch (note->descsz)
330 {
331 default:
b34976b6 332 return FALSE;
3bab7989
ML		 333
334 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
335 elf_tdata (abfd)->core_program
336 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
337 elf_tdata (abfd)->core_command
338 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
339 }
340
341 /* Note that for some reason, a spurious space is tacked
342 onto the end of the args in some (at least one anyway)
343 implementations, so strip it off if it exists. */
344
345 {
346 char *command = elf_tdata (abfd)->core_command;
347 int n = strlen (command);
348
349 if (0 < n && command[n - 1] == ' ')
350 command[n - 1] = '\0';
351 }
352
b34976b6 353 return TRUE;
3bab7989
ML		 354}
355\f
407443a3 356/* Functions for the x86-64 ELF linker. */
70256ad8 357
407443a3 358/* The name of the dynamic interpreter. This is put in the .interp
70256ad8
AJ		 359 section. */
360
407443a3 361#define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
70256ad8 362
d40d037c
AJ		 363/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
364 copying dynamic variables from a shared lib into an app's dynbss
365 section, and instead use a dynamic relocation to point into the
366 shared lib. */
367#define ELIMINATE_COPY_RELOCS 1
368
70256ad8
AJ		 369/* The size in bytes of an entry in the global offset table. */
370
371#define GOT_ENTRY_SIZE 8
8d88c4ca 372
70256ad8 373/* The size in bytes of an entry in the procedure linkage table. */
8d88c4ca 374
70256ad8
AJ		 375#define PLT_ENTRY_SIZE 16
376
377/* The first entry in a procedure linkage table looks like this. See the
378 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
379
380static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
381{
653165cc
AJ		 382 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
383 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
10efb593 384 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
70256ad8
AJ		 385};
386
387/* Subsequent entries in a procedure linkage table look like this. */
388
389static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
390{
653165cc 391 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
407443a3 392 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
653165cc 393 0x68, /* pushq immediate */
70256ad8
AJ		 394 0, 0, 0, 0, /* replaced with index into relocation table. */
395 0xe9, /* jmp relative */
396 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
397};
398
399/* The x86-64 linker needs to keep track of the number of relocs that
985142a4 400 it decides to copy as dynamic relocs in check_relocs for each symbol.
c434dee6
AJ		 401 This is so that it can later discard them if they are found to be
402 unnecessary. We store the information in a field extending the
403 regular ELF linker hash table. */
70256ad8 404
c434dee6 405struct elf64_x86_64_dyn_relocs
70256ad8
AJ		 406{
407 /* Next section. */
c434dee6
AJ		 408 struct elf64_x86_64_dyn_relocs *next;
409
410 /* The input section of the reloc. */
411 asection *sec;
412
413 /* Total number of relocs copied for the input section. */
70256ad8 414 bfd_size_type count;
c434dee6
AJ		 415
416 /* Number of pc-relative relocs copied for the input section. */
417 bfd_size_type pc_count;
70256ad8
AJ		 418};
419
420/* x86-64 ELF linker hash entry. */
421
422struct elf64_x86_64_link_hash_entry
423{
c434dee6 424 struct elf_link_hash_entry elf;
70256ad8 425
c434dee6
AJ		 426 /* Track dynamic relocs copied for this symbol. */
427 struct elf64_x86_64_dyn_relocs *dyn_relocs;
bffbf940
JJ		 428
429#define GOT_UNKNOWN 0
430#define GOT_NORMAL 1
431#define GOT_TLS_GD 2
432#define GOT_TLS_IE 3
67a4f2b7
AO		 433#define GOT_TLS_GDESC 4
434#define GOT_TLS_GD_BOTH_P(type) \
435 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
436#define GOT_TLS_GD_P(type) \
437 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
438#define GOT_TLS_GDESC_P(type) \
439 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
440#define GOT_TLS_GD_ANY_P(type) \
441 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
bffbf940 442 unsigned char tls_type;
67a4f2b7
AO		 443
444 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
445 starting at the end of the jump table. */
446 bfd_vma tlsdesc_got;
bffbf940
JJ		 447};
448
449#define elf64_x86_64_hash_entry(ent) \
450 ((struct elf64_x86_64_link_hash_entry *)(ent))
451
452struct elf64_x86_64_obj_tdata
453{
454 struct elf_obj_tdata root;
455
456 /* tls_type for each local got entry. */
457 char *local_got_tls_type;
67a4f2b7
AO		 458
459 /* GOTPLT entries for TLS descriptors. */
460 bfd_vma *local_tlsdesc_gotent;
70256ad8
AJ		 461};
462
bffbf940
JJ		 463#define elf64_x86_64_tdata(abfd) \
464 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
465
466#define elf64_x86_64_local_got_tls_type(abfd) \
467 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
468
67a4f2b7
AO		 469#define elf64_x86_64_local_tlsdesc_gotent(abfd) \
470 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
bffbf940 471
0ffa91dd
NC		 472#define is_x86_64_elf(bfd) \
473 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
474 && elf_tdata (bfd) != NULL \
475 && elf_object_id (bfd) == X86_64_ELF_TDATA)
476
477static bfd_boolean
478elf64_x86_64_mkobject (bfd *abfd)
479{
480 return bfd_elf_allocate_object (abfd, sizeof (struct elf64_x86_64_obj_tdata),
481 X86_64_ELF_TDATA);
482}
483
c434dee6 484/* x86-64 ELF linker hash table. */
8d88c4ca 485
407443a3
AJ		 486struct elf64_x86_64_link_hash_table
487{
c434dee6 488 struct elf_link_hash_table elf;
70256ad8 489
c434dee6
AJ		 490 /* Short-cuts to get to dynamic linker sections. */
491 asection *sgot;
492 asection *sgotplt;
493 asection *srelgot;
494 asection *splt;
495 asection *srelplt;
496 asection *sdynbss;
497 asection *srelbss;
cbe950e9
L		 498 asection *igotplt;
499 asection *iplt;
500 asection *irelplt;
2a81c24a 501 asection *irelifunc;
70256ad8 502
67a4f2b7
AO		 503 /* The offset into splt of the PLT entry for the TLS descriptor
504 resolver. Special values are 0, if not necessary (or not found
505 to be necessary yet), and -1 if needed but not determined
506 yet. */
507 bfd_vma tlsdesc_plt;
508 /* The offset into sgot of the GOT entry used by the PLT entry
509 above. */
510 bfd_vma tlsdesc_got;
511
bffbf940
JJ		 512 union {
513 bfd_signed_vma refcount;
514 bfd_vma offset;
515 } tls_ld_got;
516
67a4f2b7
AO		 517 /* The amount of space used by the jump slots in the GOT. */
518 bfd_vma sgotplt_jump_table_size;
519
c434dee6
AJ		 520 /* Small local sym to section mapping cache. */
521 struct sym_sec_cache sym_sec;
9f03412a
AO		 522
523 /* _TLS_MODULE_BASE_ symbol. */
524 struct bfd_link_hash_entry *tls_module_base;
c25bc9fc
L		 525
526 /* Used by local STT_GNU_IFUNC symbols. */
527 htab_t loc_hash_table;
528 void *loc_hash_memory;
c434dee6 529};
70256ad8
AJ		 530
531/* Get the x86-64 ELF linker hash table from a link_info structure. */
8d88c4ca
NC		 532
533#define elf64_x86_64_hash_table(p) \
534 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
535
67a4f2b7
AO		 536#define elf64_x86_64_compute_jump_table_size(htab) \
537 ((htab)->srelplt->reloc_count * GOT_ENTRY_SIZE)
538
407443a3 539/* Create an entry in an x86-64 ELF linker hash table. */
70256ad8
AJ		 540
541static struct bfd_hash_entry *
eb4ff4d6
L		 542elf64_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
543 struct bfd_hash_table *table,
544 const char *string)
70256ad8 545{
70256ad8 546 /* Allocate the structure if it has not already been allocated by a
c434dee6
AJ		 547 subclass. */
548 if (entry == NULL)
549 {
550 entry = bfd_hash_allocate (table,
551 sizeof (struct elf64_x86_64_link_hash_entry));
552 if (entry == NULL)
553 return entry;
554 }
70256ad8
AJ		 555
556 /* Call the allocation method of the superclass. */
c434dee6
AJ		 557 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
558 if (entry != NULL)
70256ad8 559 {
c434dee6
AJ		 560 struct elf64_x86_64_link_hash_entry *eh;
561
562 eh = (struct elf64_x86_64_link_hash_entry *) entry;
563 eh->dyn_relocs = NULL;
bffbf940 564 eh->tls_type = GOT_UNKNOWN;
67a4f2b7 565 eh->tlsdesc_got = (bfd_vma) -1;
70256ad8
AJ		 566 }
567
c434dee6 568 return entry;
70256ad8
AJ		 569}
570
c25bc9fc
L		 571static hashval_t
572elf64_x86_64_local_hash (int id, int r_sym)
573{
574 return ((((id & 0xff) << 24) | ((id & 0xff00) << 8))
575 ^ r_sym ^ (id >> 16));
576}
577
578/* Compute a hash of a local hash entry. We use elf_link_hash_entry
579 for local symbol so that we can handle local STT_GNU_IFUNC symbols
580 as global symbol. We reuse indx and dynstr_index for local symbol
581 hash since they aren't used by global symbols in this backend. */
582
583static hashval_t
584elf64_x86_64_local_htab_hash (const void *ptr)
585{
586 struct elf_link_hash_entry *h
587 = (struct elf_link_hash_entry *) ptr;
588 return elf64_x86_64_local_hash (h->indx, h->dynstr_index);
589}
590
591/* Compare local hash entries. */
592
593static int
594elf64_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
595{
596 struct elf_link_hash_entry *h1
597 = (struct elf_link_hash_entry *) ptr1;
598 struct elf_link_hash_entry *h2
599 = (struct elf_link_hash_entry *) ptr2;
600
601 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
602}
603
604/* Find and/or create a hash entry for local symbol. */
605
606static struct elf_link_hash_entry *
607elf64_x86_64_get_local_sym_hash (struct elf64_x86_64_link_hash_table *htab,
608 bfd *abfd, const Elf_Internal_Rela *rel,
609 bfd_boolean create)
610{
611 struct elf64_x86_64_link_hash_entry e, *ret;
612 asection *sec = abfd->sections;
613 hashval_t h = elf64_x86_64_local_hash (sec->id,
614 ELF64_R_SYM (rel->r_info));
615 void **slot;
616
617 e.elf.indx = sec->id;
618 e.elf.dynstr_index = ELF64_R_SYM (rel->r_info);
619 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
620 create ? INSERT : NO_INSERT);
621
622 if (!slot)
623 return NULL;
624
625 if (*slot)
626 {
627 ret = (struct elf64_x86_64_link_hash_entry *) *slot;
628 return &ret->elf;
629 }
630
631 ret = (struct elf64_x86_64_link_hash_entry *)
632 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
633 sizeof (struct elf64_x86_64_link_hash_entry));
634 if (ret)
635 {
636 memset (ret, 0, sizeof (*ret));
637 ret->elf.indx = sec->id;
638 ret->elf.dynstr_index = ELF64_R_SYM (rel->r_info);
639 ret->elf.dynindx = -1;
640 ret->elf.plt.offset = (bfd_vma) -1;
641 ret->elf.got.offset = (bfd_vma) -1;
642 *slot = ret;
643 }
644 return &ret->elf;
645}
646
8d88c4ca
NC		 647/* Create an X86-64 ELF linker hash table. */
648
649static struct bfd_link_hash_table *
27482721 650elf64_x86_64_link_hash_table_create (bfd *abfd)
8d88c4ca
NC		 651{
652 struct elf64_x86_64_link_hash_table *ret;
dc810e39 653 bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table);
8d88c4ca 654
e2d34d7d 655 ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt);
c434dee6 656 if (ret == NULL)
8d88c4ca
NC		 657 return NULL;
658
eb4ff4d6
L		 659 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
660 elf64_x86_64_link_hash_newfunc,
66eb6687 661 sizeof (struct elf64_x86_64_link_hash_entry)))
8d88c4ca 662 {
e2d34d7d 663 free (ret);
8d88c4ca
NC		 664 return NULL;
665 }
666
c434dee6
AJ		 667 ret->sgot = NULL;
668 ret->sgotplt = NULL;
669 ret->srelgot = NULL;
670 ret->splt = NULL;
671 ret->srelplt = NULL;
672 ret->sdynbss = NULL;
673 ret->srelbss = NULL;
cbe950e9
L		 674 ret->igotplt= NULL;
675 ret->iplt = NULL;
676 ret->irelplt= NULL;
2a81c24a 677 ret->irelifunc = NULL;
c434dee6 678 ret->sym_sec.abfd = NULL;
67a4f2b7
AO		 679 ret->tlsdesc_plt = 0;
680 ret->tlsdesc_got = 0;
bffbf940 681 ret->tls_ld_got.refcount = 0;
67a4f2b7 682 ret->sgotplt_jump_table_size = 0;
9f03412a 683 ret->tls_module_base = NULL;
c434dee6 684
c25bc9fc
L		 685 ret->loc_hash_table = htab_try_create (1024,
686 elf64_x86_64_local_htab_hash,
687 elf64_x86_64_local_htab_eq,
688 NULL);
689 ret->loc_hash_memory = objalloc_create ();
690 if (!ret->loc_hash_table || !ret->loc_hash_memory)
691 {
692 free (ret);
693 return NULL;
694 }
695
c434dee6
AJ		 696 return &ret->elf.root;
697}
698
c25bc9fc
L		 699/* Destroy an X86-64 ELF linker hash table. */
700
701static void
702elf64_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash)
703{
704 struct elf64_x86_64_link_hash_table *htab
705 = (struct elf64_x86_64_link_hash_table *) hash;
706
707 if (htab->loc_hash_table)
708 htab_delete (htab->loc_hash_table);
709 if (htab->loc_hash_memory)
710 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
711 _bfd_generic_link_hash_table_free (hash);
712}
713
c434dee6
AJ		 714/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
715 shortcuts to them in our hash table. */
716
b34976b6 717static bfd_boolean
eb4ff4d6 718elf64_x86_64_create_got_section (bfd *dynobj, struct bfd_link_info *info)
c434dee6
AJ		 719{
720 struct elf64_x86_64_link_hash_table *htab;
721
722 if (! _bfd_elf_create_got_section (dynobj, info))
b34976b6 723 return FALSE;
c434dee6
AJ		 724
725 htab = elf64_x86_64_hash_table (info);
726 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
727 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
728 if (!htab->sgot || !htab->sgotplt)
729 abort ();
730
3496cb2a
L		 731 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
732 (SEC_ALLOC | SEC_LOAD
733 | SEC_HAS_CONTENTS
734 | SEC_IN_MEMORY
735 | SEC_LINKER_CREATED
736 | SEC_READONLY));
c434dee6 737 if (htab->srelgot == NULL
c434dee6 738 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
b34976b6
AM		 739 return FALSE;
740 return TRUE;
c434dee6
AJ		 741}
742
743/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
744 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
745 hash table. */
746
b34976b6 747static bfd_boolean
27482721 748elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
c434dee6
AJ		 749{
750 struct elf64_x86_64_link_hash_table *htab;
751
752 htab = elf64_x86_64_hash_table (info);
eb4ff4d6 753 if (!htab->sgot && !elf64_x86_64_create_got_section (dynobj, info))
b34976b6 754 return FALSE;
c434dee6
AJ		 755
756 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
b34976b6 757 return FALSE;
c434dee6
AJ		 758
759 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
760 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
761 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
762 if (!info->shared)
763 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
764
765 if (!htab->splt || !htab->srelplt || !htab->sdynbss
766 || (!info->shared && !htab->srelbss))
767 abort ();
768
b34976b6 769 return TRUE;
c434dee6
AJ		 770}
771
772/* Copy the extra info we tack onto an elf_link_hash_entry. */
773
774static void
fcfa13d2 775elf64_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
27482721
AJ		 776 struct elf_link_hash_entry *dir,
777 struct elf_link_hash_entry *ind)
c434dee6
AJ		 778{
779 struct elf64_x86_64_link_hash_entry *edir, *eind;
780
781 edir = (struct elf64_x86_64_link_hash_entry *) dir;
782 eind = (struct elf64_x86_64_link_hash_entry *) ind;
783
784 if (eind->dyn_relocs != NULL)
785 {
786 if (edir->dyn_relocs != NULL)
787 {
788 struct elf64_x86_64_dyn_relocs **pp;
789 struct elf64_x86_64_dyn_relocs *p;
790
fcfa13d2 791 /* Add reloc counts against the indirect sym to the direct sym
c434dee6
AJ		 792 list. Merge any entries against the same section. */
793 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
794 {
795 struct elf64_x86_64_dyn_relocs *q;
796
797 for (q = edir->dyn_relocs; q != NULL; q = q->next)
798 if (q->sec == p->sec)
799 {
800 q->pc_count += p->pc_count;
801 q->count += p->count;
802 *pp = p->next;
803 break;
804 }
805 if (q == NULL)
806 pp = &p->next;
807 }
808 *pp = edir->dyn_relocs;
809 }
810
811 edir->dyn_relocs = eind->dyn_relocs;
812 eind->dyn_relocs = NULL;
813 }
814
bffbf940
JJ		 815 if (ind->root.type == bfd_link_hash_indirect
816 && dir->got.refcount <= 0)
817 {
818 edir->tls_type = eind->tls_type;
819 eind->tls_type = GOT_UNKNOWN;
820 }
821
d40d037c
AJ		 822 if (ELIMINATE_COPY_RELOCS
823 && ind->root.type != bfd_link_hash_indirect
f5385ebf
AM		 824 && dir->dynamic_adjusted)
825 {
826 /* If called to transfer flags for a weakdef during processing
827 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
828 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
829 dir->ref_dynamic |= ind->ref_dynamic;
830 dir->ref_regular |= ind->ref_regular;
831 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
832 dir->needs_plt |= ind->needs_plt;
833 dir->pointer_equality_needed |= ind->pointer_equality_needed;
834 }
d40d037c 835 else
fcfa13d2 836 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
8d88c4ca
NC		 837}
838
b34976b6 839static bfd_boolean
27482721 840elf64_x86_64_elf_object_p (bfd *abfd)
bffbf940 841{
8d88c4ca
NC		 842 /* Set the right machine number for an x86-64 elf64 file. */
843 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
b34976b6 844 return TRUE;
8d88c4ca
NC		 845}
846
142411ca
L		 847typedef union
848 {
849 unsigned char c[2];
850 uint16_t i;
851 }
852x86_64_opcode16;
853
854typedef union
855 {
856 unsigned char c[4];
857 uint32_t i;
858 }
859x86_64_opcode32;
860
861/* Return TRUE if the TLS access code sequence support transition
862 from R_TYPE. */
863
864static bfd_boolean
865elf64_x86_64_check_tls_transition (bfd *abfd, asection *sec,
866 bfd_byte *contents,
867 Elf_Internal_Shdr *symtab_hdr,
868 struct elf_link_hash_entry **sym_hashes,
869 unsigned int r_type,
870 const Elf_Internal_Rela *rel,
871 const Elf_Internal_Rela *relend)
bffbf940 872{
142411ca
L		 873 unsigned int val;
874 unsigned long r_symndx;
875 struct elf_link_hash_entry *h;
876 bfd_vma offset;
877
878 /* Get the section contents. */
879 if (contents == NULL)
880 {
881 if (elf_section_data (sec)->this_hdr.contents != NULL)
882 contents = elf_section_data (sec)->this_hdr.contents;
883 else
884 {
885 /* FIXME: How to better handle error condition? */
886 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
887 return FALSE;
bffbf940 888
142411ca
L		 889 /* Cache the section contents for elf_link_input_bfd. */
890 elf_section_data (sec)->this_hdr.contents = contents;
891 }
892 }
893
894 offset = rel->r_offset;
bffbf940 895 switch (r_type)
142411ca
L		 896 {
897 case R_X86_64_TLSGD:
898 case R_X86_64_TLSLD:
899 if ((rel + 1) >= relend)
900 return FALSE;
901
902 if (r_type == R_X86_64_TLSGD)
903 {
904 /* Check transition from GD access model. Only
905 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
906 .word 0x6666; rex64; call __tls_get_addr
907 can transit to different access model. */
908
909 static x86_64_opcode32 leaq = { { 0x66, 0x48, 0x8d, 0x3d } },
910 call = { { 0x66, 0x66, 0x48, 0xe8 } };
911 if (offset < 4
912 || (offset + 12) > sec->size
913 || bfd_get_32 (abfd, contents + offset - 4) != leaq.i
914 || bfd_get_32 (abfd, contents + offset + 4) != call.i)
915 return FALSE;
916 }
917 else
918 {
919 /* Check transition from LD access model. Only
920 leaq foo@tlsld(%rip), %rdi;
921 call __tls_get_addr
922 can transit to different access model. */
923
924 static x86_64_opcode32 ld = { { 0x48, 0x8d, 0x3d, 0xe8 } };
925 x86_64_opcode32 op;
926
927 if (offset < 3 || (offset + 9) > sec->size)
928 return FALSE;
929
930 op.i = bfd_get_32 (abfd, contents + offset - 3);
931 op.c[3] = bfd_get_8 (abfd, contents + offset + 4);
932 if (op.i != ld.i)
933 return FALSE;
934 }
935
936 r_symndx = ELF64_R_SYM (rel[1].r_info);
937 if (r_symndx < symtab_hdr->sh_info)
938 return FALSE;
939
940 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
c4fb387b
L		 941 /* Use strncmp to check __tls_get_addr since __tls_get_addr
942 may be versioned. */
142411ca
L		 943 return (h != NULL
944 && h->root.root.string != NULL
945 && (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PC32
946 || ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
c4fb387b
L		 947 && (strncmp (h->root.root.string,
948 "__tls_get_addr", 14) == 0));
142411ca
L		 949
950 case R_X86_64_GOTTPOFF:
951 /* Check transition from IE access model:
952 movq foo@gottpoff(%rip), %reg
953 addq foo@gottpoff(%rip), %reg
954 */
955
956 if (offset < 3 || (offset + 4) > sec->size)
957 return FALSE;
958
959 val = bfd_get_8 (abfd, contents + offset - 3);
960 if (val != 0x48 && val != 0x4c)
961 return FALSE;
962
963 val = bfd_get_8 (abfd, contents + offset - 2);
964 if (val != 0x8b && val != 0x03)
965 return FALSE;
966
967 val = bfd_get_8 (abfd, contents + offset - 1);
968 return (val & 0xc7) == 5;
969
970 case R_X86_64_GOTPC32_TLSDESC:
971 /* Check transition from GDesc access model:
972 leaq x@tlsdesc(%rip), %rax
973
974 Make sure it's a leaq adding rip to a 32-bit offset
975 into any register, although it's probably almost always
976 going to be rax. */
977
978 if (offset < 3 || (offset + 4) > sec->size)
979 return FALSE;
980
981 val = bfd_get_8 (abfd, contents + offset - 3);
982 if ((val & 0xfb) != 0x48)
983 return FALSE;
984
985 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
986 return FALSE;
987
988 val = bfd_get_8 (abfd, contents + offset - 1);
989 return (val & 0xc7) == 0x05;
990
991 case R_X86_64_TLSDESC_CALL:
992 /* Check transition from GDesc access model:
993 call *x@tlsdesc(%rax)
994 */
995 if (offset + 2 <= sec->size)
996 {
997 /* Make sure that it's a call *x@tlsdesc(%rax). */
998 static x86_64_opcode16 call = { { 0xff, 0x10 } };
999 return bfd_get_16 (abfd, contents + offset) == call.i;
1000 }
1001
1002 return FALSE;
1003
1004 default:
1005 abort ();
1006 }
1007}
1008
1009/* Return TRUE if the TLS access transition is OK or no transition
1010 will be performed. Update R_TYPE if there is a transition. */
1011
1012static bfd_boolean
1013elf64_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1014 asection *sec, bfd_byte *contents,
1015 Elf_Internal_Shdr *symtab_hdr,
1016 struct elf_link_hash_entry **sym_hashes,
1017 unsigned int *r_type, int tls_type,
1018 const Elf_Internal_Rela *rel,
1019 const Elf_Internal_Rela *relend,
1020 struct elf_link_hash_entry *h)
1021{
1022 unsigned int from_type = *r_type;
1023 unsigned int to_type = from_type;
1024 bfd_boolean check = TRUE;
1025
1026 switch (from_type)
bffbf940
JJ		 1027 {
1028 case R_X86_64_TLSGD:
67a4f2b7
AO		 1029 case R_X86_64_GOTPC32_TLSDESC:
1030 case R_X86_64_TLSDESC_CALL:
bffbf940 1031 case R_X86_64_GOTTPOFF:
142411ca
L		 1032 if (!info->shared)
1033 {
1034 if (h == NULL)
1035 to_type = R_X86_64_TPOFF32;
1036 else
1037 to_type = R_X86_64_GOTTPOFF;
1038 }
1039
1040 /* When we are called from elf64_x86_64_relocate_section,
1041 CONTENTS isn't NULL and there may be additional transitions
1042 based on TLS_TYPE. */
1043 if (contents != NULL)
1044 {
1045 unsigned int new_to_type = to_type;
1046
1047 if (!info->shared
1048 && h != NULL
1049 && h->dynindx == -1
1050 && tls_type == GOT_TLS_IE)
1051 new_to_type = R_X86_64_TPOFF32;
1052
1053 if (to_type == R_X86_64_TLSGD
1054 || to_type == R_X86_64_GOTPC32_TLSDESC
1055 || to_type == R_X86_64_TLSDESC_CALL)
1056 {
1057 if (tls_type == GOT_TLS_IE)
1058 new_to_type = R_X86_64_GOTTPOFF;
1059 }
1060
1061 /* We checked the transition before when we were called from
1062 elf64_x86_64_check_relocs. We only want to check the new
1063 transition which hasn't been checked before. */
1064 check = new_to_type != to_type && from_type == to_type;
1065 to_type = new_to_type;
1066 }
1067
1068 break;
1069
bffbf940 1070 case R_X86_64_TLSLD:
142411ca
L		 1071 if (!info->shared)
1072 to_type = R_X86_64_TPOFF32;
1073 break;
1074
1075 default:
1076 return TRUE;
bffbf940
JJ		 1077 }
1078
142411ca
L		 1079 /* Return TRUE if there is no transition. */
1080 if (from_type == to_type)
1081 return TRUE;
1082
1083 /* Check if the transition can be performed. */
1084 if (check
1085 && ! elf64_x86_64_check_tls_transition (abfd, sec, contents,
1086 symtab_hdr, sym_hashes,
1087 from_type, rel, relend))
1088 {
2f629d23 1089 reloc_howto_type *from, *to;
142411ca
L		 1090
1091 from = elf64_x86_64_rtype_to_howto (abfd, from_type);
1092 to = elf64_x86_64_rtype_to_howto (abfd, to_type);
1093
1094 (*_bfd_error_handler)
1095 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1096 "in section `%A' failed"),
1097 abfd, sec, from->name, to->name,
1098 h ? h->root.root.string : "a local symbol",
1099 (unsigned long) rel->r_offset);
1100 bfd_set_error (bfd_error_bad_value);
1101 return FALSE;
1102 }
1103
1104 *r_type = to_type;
1105 return TRUE;
bffbf940
JJ		 1106}
1107
70256ad8 1108/* Look through the relocs for a section during the first phase, and
c434dee6
AJ		 1109 calculate needed space in the global offset table, procedure
1110 linkage table, and dynamic reloc sections. */
70256ad8 1111
b34976b6 1112static bfd_boolean
142411ca
L		 1113elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1114 asection *sec,
27482721 1115 const Elf_Internal_Rela *relocs)
70256ad8 1116{
c434dee6 1117 struct elf64_x86_64_link_hash_table *htab;
70256ad8
AJ		 1118 Elf_Internal_Shdr *symtab_hdr;
1119 struct elf_link_hash_entry **sym_hashes;
70256ad8
AJ		 1120 const Elf_Internal_Rela *rel;
1121 const Elf_Internal_Rela *rel_end;
70256ad8 1122 asection *sreloc;
c25bc9fc 1123 Elf_Internal_Sym *isymbuf;
70256ad8 1124
1049f94e 1125 if (info->relocatable)
b34976b6 1126 return TRUE;
70256ad8 1127
0ffa91dd
NC		 1128 BFD_ASSERT (is_x86_64_elf (abfd));
1129
c434dee6 1130 htab = elf64_x86_64_hash_table (info);
0ffa91dd 1131 symtab_hdr = &elf_symtab_hdr (abfd);
c25bc9fc 1132 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
70256ad8 1133 sym_hashes = elf_sym_hashes (abfd);
70256ad8 1134
c434dee6 1135 sreloc = NULL;
cbe950e9 1136
70256ad8
AJ		 1137 rel_end = relocs + sec->reloc_count;
1138 for (rel = relocs; rel < rel_end; rel++)
1139 {
bffbf940 1140 unsigned int r_type;
70256ad8
AJ		 1141 unsigned long r_symndx;
1142 struct elf_link_hash_entry *h;
1143
1144 r_symndx = ELF64_R_SYM (rel->r_info);
bffbf940 1145 r_type = ELF64_R_TYPE (rel->r_info);
c434dee6
AJ		 1146
1147 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1148 {
d003868e
AM		 1149 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1150 abfd, r_symndx);
b34976b6 1151 return FALSE;
c434dee6
AJ		 1152 }
1153
70256ad8 1154 if (r_symndx < symtab_hdr->sh_info)
c25bc9fc
L		 1155 {
1156 /* A local symbol. */
1157 Elf_Internal_Sym *isym;
1158
1159 /* Read this BFD's local symbols. */
1160 if (isymbuf == NULL)
1161 {
1162 if (isymbuf == NULL)
1163 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
1164 symtab_hdr->sh_info, 0,
1165 NULL, NULL, NULL);
1166 if (isymbuf == NULL)
1167 return FALSE;
1168 }
1169
1170 /* Check relocation against local STT_GNU_IFUNC symbol. */
1171 isym = isymbuf + r_symndx;
1172 if (ELF64_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1173 {
1174 h = elf64_x86_64_get_local_sym_hash (htab, abfd, rel,
1175 TRUE);
1176 if (h == NULL)
1177 return FALSE;
1178
1179 /* Fake a STT_GNU_IFUNC symbol. */
1180 h->type = STT_GNU_IFUNC;
1181 h->def_regular = 1;
1182 h->ref_regular = 1;
1183 h->forced_local = 1;
1184 h->root.type = bfd_link_hash_defined;
1185 }
1186 else
1187 h = NULL;
1188 }
70256ad8 1189 else
71cb9464
L		 1190 {
1191 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1192 while (h->root.type == bfd_link_hash_indirect
1193 || h->root.type == bfd_link_hash_warning)
1194 h = (struct elf_link_hash_entry *) h->root.u.i.link;
c25bc9fc 1195 }
cbe950e9 1196
c25bc9fc
L		 1197 if (h != NULL)
1198 {
cbe950e9
L		 1199 /* Create the ifunc sections for static executables. If we
1200 never see an indirect function symbol nor we are building
1201 a static executable, those sections will be empty and
1202 won't appear in output. */
1203 switch (r_type)
1204 {
1205 default:
1206 break;
1207
1208 case R_X86_64_32S:
1209 case R_X86_64_32:
1210 case R_X86_64_64:
1211 case R_X86_64_PC32:
1212 case R_X86_64_PC64:
1213 case R_X86_64_PLT32:
1214 case R_X86_64_GOTPCREL:
1215 case R_X86_64_GOTPCREL64:
2a81c24a 1216 if (htab->irelifunc == NULL && htab->iplt == NULL)
cbe950e9 1217 {
2a81c24a 1218 if (!_bfd_elf_create_ifunc_sections (abfd, info))
cbe950e9
L		 1219 return FALSE;
1220
2a81c24a
L		 1221 if (info->shared)
1222 {
1223 htab->irelifunc = bfd_get_section_by_name (abfd,
1224 ".rela.ifunc");
1225 if (!htab->irelifunc)
1226 abort ();
1227 }
1228 else
1229 {
1230 htab->iplt = bfd_get_section_by_name (abfd, ".iplt");
1231 htab->irelplt = bfd_get_section_by_name (abfd,
1232 ".rela.iplt");
1233 htab->igotplt = bfd_get_section_by_name (abfd,
1234 ".igot.plt");
1235 if (!htab->iplt
1236 || !htab->irelplt
1237 || !htab->igotplt)
1238 abort ();
1239 }
cbe950e9
L		 1240 }
1241 break;
1242 }
1243
1244 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1245 it here if it is defined in a non-shared object. */
1246 if (h->type == STT_GNU_IFUNC
1247 && h->def_regular)
1248 {
1249 /* It is referenced by a non-shared object. */
1250 h->ref_regular = 1;
1251
1252 /* STT_GNU_IFUNC symbol must go through PLT. */
1253 h->plt.refcount += 1;
1254
1255 /* STT_GNU_IFUNC needs dynamic sections. */
1256 if (htab->elf.dynobj == NULL)
1257 htab->elf.dynobj = abfd;
1258
1259 switch (r_type)
1260 {
1261 default:
1262 (*_bfd_error_handler)
1263 (_("%B: relocation %s against STT_GNU_IFUNC "
1264 "symbol `%s' isn't handled by %s"), abfd,
1265 x86_64_elf_howto_table[r_type].name,
8b7e2992
L		 1266 (h->root.root.string
1267 ? h->root.root.string : "a local symbol"),
c25bc9fc 1268 __FUNCTION__);
cbe950e9
L		 1269 bfd_set_error (bfd_error_bad_value);
1270 return FALSE;
1271
710ab287
L		 1272 case R_X86_64_64:
1273 h->non_got_ref = 1;
1274 h->pointer_equality_needed = 1;
1275 if (info->shared)
1276 {
1277 struct elf64_x86_64_dyn_relocs *p;
1278 struct elf64_x86_64_dyn_relocs **head;
1279
1280 /* We must copy these reloc types into the output
1281 file. Create a reloc section in dynobj and
1282 make room for this reloc. */
1283 if (sreloc == NULL)
1284 {
1285 if (htab->elf.dynobj == NULL)
1286 htab->elf.dynobj = abfd;
1287
1288 sreloc = _bfd_elf_make_dynamic_reloc_section
1289 (sec, htab->elf.dynobj, 3, abfd, TRUE);
1290
1291 if (sreloc == NULL)
1292 return FALSE;
1293 }
1294
1295 head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs;
1296 p = *head;
1297 if (p == NULL || p->sec != sec)
1298 {
1299 bfd_size_type amt = sizeof *p;
1300
1301 p = ((struct elf64_x86_64_dyn_relocs *)
1302 bfd_alloc (htab->elf.dynobj, amt));
1303 if (p == NULL)
1304 return FALSE;
1305 p->next = *head;
1306 *head = p;
1307 p->sec = sec;
1308 p->count = 0;
1309 p->pc_count = 0;
1310 }
1311 p->count += 1;
1312 }
1313 break;
1314
cbe950e9
L		 1315 case R_X86_64_32S:
1316 case R_X86_64_32:
cbe950e9
L		 1317 case R_X86_64_PC32:
1318 case R_X86_64_PC64:
1319 h->non_got_ref = 1;
1320 if (r_type != R_X86_64_PC32
1321 && r_type != R_X86_64_PC64)
1322 h->pointer_equality_needed = 1;
1323 break;
1324
1325 case R_X86_64_PLT32:
1326 break;
1327
1328 case R_X86_64_GOTPCREL:
1329 case R_X86_64_GOTPCREL64:
7afd84dc 1330 h->got.refcount += 1;
cbe950e9
L		 1331 if (htab->sgot == NULL
1332 && !elf64_x86_64_create_got_section (htab->elf.dynobj,
1333 info))
1334 return FALSE;
1335 break;
1336 }
1337
1338 continue;
1339 }
71cb9464 1340 }
70256ad8 1341
142411ca
L		 1342 if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1343 symtab_hdr, sym_hashes,
1344 &r_type, GOT_UNKNOWN,
1345 rel, rel_end, h))
1346 return FALSE;
1347
bffbf940 1348 switch (r_type)
70256ad8 1349 {
bffbf940
JJ		 1350 case R_X86_64_TLSLD:
1351 htab->tls_ld_got.refcount += 1;
1352 goto create_got;
1353
1354 case R_X86_64_TPOFF32:
1355 if (info->shared)
70256ad8 1356 {
bffbf940 1357 (*_bfd_error_handler)
d003868e
AM		 1358 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1359 abfd,
6610a52d
L		 1360 x86_64_elf_howto_table[r_type].name,
1361 (h) ? h->root.root.string : "a local symbol");
bffbf940 1362 bfd_set_error (bfd_error_bad_value);
b34976b6 1363 return FALSE;
70256ad8 1364 }
bffbf940 1365 break;
c434dee6 1366
bffbf940
JJ		 1367 case R_X86_64_GOTTPOFF:
1368 if (info->shared)
1369 info->flags |= DF_STATIC_TLS;
1370 /* Fall through */
70256ad8 1371
bffbf940
JJ		 1372 case R_X86_64_GOT32:
1373 case R_X86_64_GOTPCREL:
1374 case R_X86_64_TLSGD:
7b81dfbb
AJ		 1375 case R_X86_64_GOT64:
1376 case R_X86_64_GOTPCREL64:
1377 case R_X86_64_GOTPLT64:
67a4f2b7
AO		 1378 case R_X86_64_GOTPC32_TLSDESC:
1379 case R_X86_64_TLSDESC_CALL:
bffbf940
JJ		 1380 /* This symbol requires a global offset table entry. */
1381 {
1382 int tls_type, old_tls_type;
1383
1384 switch (r_type)
1385 {
1386 default: tls_type = GOT_NORMAL; break;
1387 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1388 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
67a4f2b7
AO		 1389 case R_X86_64_GOTPC32_TLSDESC:
1390 case R_X86_64_TLSDESC_CALL:
1391 tls_type = GOT_TLS_GDESC; break;
bffbf940
JJ		 1392 }
1393
1394 if (h != NULL)
1395 {
7b81dfbb
AJ		 1396 if (r_type == R_X86_64_GOTPLT64)
1397 {
1398 /* This relocation indicates that we also need
1399 a PLT entry, as this is a function. We don't need
1400 a PLT entry for local symbols. */
1401 h->needs_plt = 1;
1402 h->plt.refcount += 1;
1403 }
bffbf940
JJ		 1404 h->got.refcount += 1;
1405 old_tls_type = elf64_x86_64_hash_entry (h)->tls_type;
1406 }
1407 else
1408 {
1409 bfd_signed_vma *local_got_refcounts;
1410
1411 /* This is a global offset table entry for a local symbol. */
1412 local_got_refcounts = elf_local_got_refcounts (abfd);
1413 if (local_got_refcounts == NULL)
1414 {
1415 bfd_size_type size;
1416
1417 size = symtab_hdr->sh_info;
67a4f2b7
AO		 1418 size *= sizeof (bfd_signed_vma)
1419 + sizeof (bfd_vma) + sizeof (char);
bffbf940
JJ		 1420 local_got_refcounts = ((bfd_signed_vma *)
1421 bfd_zalloc (abfd, size));
1422 if (local_got_refcounts == NULL)
b34976b6 1423 return FALSE;
bffbf940 1424 elf_local_got_refcounts (abfd) = local_got_refcounts;
67a4f2b7
AO		 1425 elf64_x86_64_local_tlsdesc_gotent (abfd)
1426 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
bffbf940 1427 elf64_x86_64_local_got_tls_type (abfd)
67a4f2b7 1428 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
bffbf940
JJ		 1429 }
1430 local_got_refcounts[r_symndx] += 1;
1431 old_tls_type
1432 = elf64_x86_64_local_got_tls_type (abfd) [r_symndx];
1433 }
1434
1435 /* If a TLS symbol is accessed using IE at least once,
1436 there is no point to use dynamic model for it. */
1437 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
67a4f2b7
AO		 1438 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1439 || tls_type != GOT_TLS_IE))
bffbf940 1440 {
67a4f2b7 1441 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
bffbf940 1442 tls_type = old_tls_type;
67a4f2b7
AO		 1443 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1444 && GOT_TLS_GD_ANY_P (tls_type))
1445 tls_type |= old_tls_type;
bffbf940
JJ		 1446 else
1447 {
1448 (*_bfd_error_handler)
1f7a4e42 1449 (_("%B: '%s' accessed both as normal and thread local symbol"),
d003868e 1450 abfd, h ? h->root.root.string : "<local>");
b34976b6 1451 return FALSE;
bffbf940
JJ		 1452 }
1453 }
1454
1455 if (old_tls_type != tls_type)
1456 {
1457 if (h != NULL)
1458 elf64_x86_64_hash_entry (h)->tls_type = tls_type;
1459 else
1460 elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1461 }
1462 }
c434dee6
AJ		 1463 /* Fall through */
1464
d6ab8113
JB		 1465 case R_X86_64_GOTOFF64:
1466 case R_X86_64_GOTPC32:
7b81dfbb 1467 case R_X86_64_GOTPC64:
bffbf940 1468 create_got:
c434dee6
AJ		 1469 if (htab->sgot == NULL)
1470 {
1471 if (htab->elf.dynobj == NULL)
1472 htab->elf.dynobj = abfd;
eb4ff4d6
L		 1473 if (!elf64_x86_64_create_got_section (htab->elf.dynobj,
1474 info))
b34976b6 1475 return FALSE;
c434dee6 1476 }
70256ad8
AJ		 1477 break;
1478
1479 case R_X86_64_PLT32:
1480 /* This symbol requires a procedure linkage table entry. We
407443a3
AJ		 1481 actually build the entry in adjust_dynamic_symbol,
1482 because this might be a case of linking PIC code which is
1483 never referenced by a dynamic object, in which case we
1484 don't need to generate a procedure linkage table entry
1485 after all. */
70256ad8
AJ		 1486
1487 /* If this is a local symbol, we resolve it directly without
407443a3 1488 creating a procedure linkage table entry. */
70256ad8
AJ		 1489 if (h == NULL)
1490 continue;
1491
f5385ebf 1492 h->needs_plt = 1;
51b64d56 1493 h->plt.refcount += 1;
70256ad8
AJ		 1494 break;
1495
7b81dfbb
AJ		 1496 case R_X86_64_PLTOFF64:
1497 /* This tries to form the 'address' of a function relative
1498 to GOT. For global symbols we need a PLT entry. */
1499 if (h != NULL)
1500 {
1501 h->needs_plt = 1;
1502 h->plt.refcount += 1;
1503 }
1504 goto create_got;
1505
cc78d0af
AJ		 1506 case R_X86_64_8:
1507 case R_X86_64_16:
70256ad8
AJ		 1508 case R_X86_64_32:
1509 case R_X86_64_32S:
1b71fb54
AJ		 1510 /* Let's help debug shared library creation. These relocs
1511 cannot be used in shared libs. Don't error out for
1512 sections we don't care about, such as debug sections or
1513 non-constant sections. */
1514 if (info->shared
1515 && (sec->flags & SEC_ALLOC) != 0
1516 && (sec->flags & SEC_READONLY) != 0)
1517 {
1518 (*_bfd_error_handler)
d003868e
AM		 1519 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1520 abfd,
6610a52d
L		 1521 x86_64_elf_howto_table[r_type].name,
1522 (h) ? h->root.root.string : "a local symbol");
1b71fb54 1523 bfd_set_error (bfd_error_bad_value);
b34976b6 1524 return FALSE;
1b71fb54
AJ		 1525 }
1526 /* Fall through. */
1527
c434dee6
AJ		 1528 case R_X86_64_PC8:
1529 case R_X86_64_PC16:
70256ad8 1530 case R_X86_64_PC32:
d6ab8113 1531 case R_X86_64_PC64:
1b71fb54 1532 case R_X86_64_64:
710ab287 1533 if (h != NULL && info->executable)
c434dee6
AJ		 1534 {
1535 /* If this reloc is in a read-only section, we might
1536 need a copy reloc. We can't check reliably at this
1537 stage whether the section is read-only, as input
1538 sections have not yet been mapped to output sections.
1539 Tentatively set the flag for now, and correct in
1540 adjust_dynamic_symbol. */
f5385ebf 1541 h->non_got_ref = 1;
c434dee6
AJ		 1542
1543 /* We may need a .plt entry if the function this reloc
1544 refers to is in a shared lib. */
1545 h->plt.refcount += 1;
d6ab8113 1546 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
f5385ebf 1547 h->pointer_equality_needed = 1;
c434dee6 1548 }
70256ad8
AJ		 1549
1550 /* If we are creating a shared library, and this is a reloc
1551 against a global symbol, or a non PC relative reloc
1552 against a local symbol, then we need to copy the reloc
1553 into the shared library. However, if we are linking with
1554 -Bsymbolic, we do not need to copy a reloc against a
1555 global symbol which is defined in an object we are
407443a3 1556 including in the link (i.e., DEF_REGULAR is set). At
70256ad8
AJ		 1557 this point we have not seen all the input files, so it is
1558 possible that DEF_REGULAR is not set now but will be set
c434dee6
AJ		 1559 later (it is never cleared). In case of a weak definition,
1560 DEF_REGULAR may be cleared later by a strong definition in
1561 a shared library. We account for that possibility below by
1562 storing information in the relocs_copied field of the hash
1563 table entry. A similar situation occurs when creating
1564 shared libraries and symbol visibility changes render the
1565 symbol local.
1566
1567 If on the other hand, we are creating an executable, we
1568 may need to keep relocations for symbols satisfied by a
1569 dynamic library if we manage to avoid copy relocs for the
0f88be7a 1570 symbol. */
c434dee6
AJ		 1571 if ((info->shared
1572 && (sec->flags & SEC_ALLOC) != 0
d8045f23 1573 && (! IS_X86_64_PCREL_TYPE (r_type)
c434dee6 1574 || (h != NULL
55255dae 1575 && (! SYMBOLIC_BIND (info, h)
c434dee6 1576 || h->root.type == bfd_link_hash_defweak
f5385ebf 1577 || !h->def_regular))))
d40d037c
AJ		 1578 || (ELIMINATE_COPY_RELOCS
1579 && !info->shared
c434dee6
AJ		 1580 && (sec->flags & SEC_ALLOC) != 0
1581 && h != NULL
1582 && (h->root.type == bfd_link_hash_defweak
0f88be7a 1583 || !h->def_regular)))
70256ad8 1584 {
c434dee6
AJ		 1585 struct elf64_x86_64_dyn_relocs *p;
1586 struct elf64_x86_64_dyn_relocs **head;
1587
1588 /* We must copy these reloc types into the output file.
1589 Create a reloc section in dynobj and make room for
1590 this reloc. */
70256ad8
AJ		 1591 if (sreloc == NULL)
1592 {
c434dee6
AJ		 1593 if (htab->elf.dynobj == NULL)
1594 htab->elf.dynobj = abfd;
1595
83bac4b0
NC		 1596 sreloc = _bfd_elf_make_dynamic_reloc_section
1597 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
70256ad8 1598
70256ad8 1599 if (sreloc == NULL)
83bac4b0 1600 return FALSE;
70256ad8
AJ		 1601 }
1602
c434dee6
AJ		 1603 /* If this is a global symbol, we count the number of
1604 relocations we need for this symbol. */
1605 if (h != NULL)
70256ad8 1606 {
c434dee6
AJ		 1607 head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs;
1608 }
1609 else
1610 {
e81d3500 1611 void **vpp;
c434dee6
AJ		 1612 /* Track dynamic relocs needed for local syms too.
1613 We really need local syms available to do this
1614 easily. Oh well. */
1615
1616 asection *s;
1617 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1618 sec, r_symndx);
1619 if (s == NULL)
b34976b6 1620 return FALSE;
70256ad8 1621
e81d3500
DD		 1622 /* Beware of type punned pointers vs strict aliasing
1623 rules. */
1624 vpp = &(elf_section_data (s)->local_dynrel);
1625 head = (struct elf64_x86_64_dyn_relocs **)vpp;
c434dee6 1626 }
70256ad8 1627
c434dee6
AJ		 1628 p = *head;
1629 if (p == NULL || p->sec != sec)
1630 {
1631 bfd_size_type amt = sizeof *p;
d8045f23 1632
c434dee6
AJ		 1633 p = ((struct elf64_x86_64_dyn_relocs *)
1634 bfd_alloc (htab->elf.dynobj, amt));
70256ad8 1635 if (p == NULL)
b34976b6 1636 return FALSE;
c434dee6
AJ		 1637 p->next = *head;
1638 *head = p;
1639 p->sec = sec;
1640 p->count = 0;
1641 p->pc_count = 0;
70256ad8 1642 }
c434dee6
AJ		 1643
1644 p->count += 1;
d8045f23 1645 if (IS_X86_64_PCREL_TYPE (r_type))
c434dee6 1646 p->pc_count += 1;
70256ad8
AJ		 1647 }
1648 break;
fe4770f4
AJ		 1649
1650 /* This relocation describes the C++ object vtable hierarchy.
1651 Reconstruct it for later use during GC. */
1652 case R_X86_64_GNU_VTINHERIT:
c152c796 1653 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
b34976b6 1654 return FALSE;
fe4770f4
AJ		 1655 break;
1656
1657 /* This relocation describes which C++ vtable entries are actually
1658 used. Record for later use during GC. */
1659 case R_X86_64_GNU_VTENTRY:
d17e0c6e
JB		 1660 BFD_ASSERT (h != NULL);
1661 if (h != NULL
1662 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
b34976b6 1663 return FALSE;
fe4770f4 1664 break;
c434dee6
AJ		 1665
1666 default:
1667 break;
70256ad8
AJ		 1668 }
1669 }
1670
b34976b6 1671 return TRUE;
70256ad8
AJ		 1672}
1673
1674/* Return the section that should be marked against GC for a given
407443a3 1675 relocation. */
70256ad8
AJ		 1676
1677static asection *
27482721 1678elf64_x86_64_gc_mark_hook (asection *sec,
07adf181 1679 struct bfd_link_info *info,
27482721
AJ		 1680 Elf_Internal_Rela *rel,
1681 struct elf_link_hash_entry *h,
1682 Elf_Internal_Sym *sym)
70256ad8
AJ		 1683{
1684 if (h != NULL)
07adf181
AM		 1685 switch (ELF64_R_TYPE (rel->r_info))
1686 {
1687 case R_X86_64_GNU_VTINHERIT:
1688 case R_X86_64_GNU_VTENTRY:
1689 return NULL;
1690 }
1691
1692 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
70256ad8
AJ		 1693}
1694
407443a3 1695/* Update the got entry reference counts for the section being removed. */
70256ad8 1696
b34976b6 1697static bfd_boolean
27482721 1698elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
142411ca
L		 1699 asection *sec,
1700 const Elf_Internal_Rela *relocs)
70256ad8
AJ		 1701{
1702 Elf_Internal_Shdr *symtab_hdr;
1703 struct elf_link_hash_entry **sym_hashes;
1704 bfd_signed_vma *local_got_refcounts;
1705 const Elf_Internal_Rela *rel, *relend;
c434dee6 1706
7dda2462
TG		 1707 if (info->relocatable)
1708 return TRUE;
1709
c434dee6 1710 elf_section_data (sec)->local_dynrel = NULL;
70256ad8 1711
0ffa91dd 1712 symtab_hdr = &elf_symtab_hdr (abfd);
70256ad8
AJ		 1713 sym_hashes = elf_sym_hashes (abfd);
1714 local_got_refcounts = elf_local_got_refcounts (abfd);
1715
70256ad8
AJ		 1716 relend = relocs + sec->reloc_count;
1717 for (rel = relocs; rel < relend; rel++)
26e41594
AM		 1718 {
1719 unsigned long r_symndx;
1720 unsigned int r_type;
1721 struct elf_link_hash_entry *h = NULL;
70256ad8 1722
26e41594
AM		 1723 r_symndx = ELF64_R_SYM (rel->r_info);
1724 if (r_symndx >= symtab_hdr->sh_info)
1725 {
1726 struct elf64_x86_64_link_hash_entry *eh;
1727 struct elf64_x86_64_dyn_relocs **pp;
1728 struct elf64_x86_64_dyn_relocs *p;
c434dee6 1729
26e41594 1730 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
3eb128b2
AM		 1731 while (h->root.type == bfd_link_hash_indirect
1732 || h->root.type == bfd_link_hash_warning)
1733 h = (struct elf_link_hash_entry *) h->root.u.i.link;
26e41594 1734 eh = (struct elf64_x86_64_link_hash_entry *) h;
c434dee6 1735
26e41594
AM		 1736 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1737 if (p->sec == sec)
1738 {
1739 /* Everything must go for SEC. */
1740 *pp = p->next;
1741 break;
1742 }
1743 }
c434dee6 1744
26e41594 1745 r_type = ELF64_R_TYPE (rel->r_info);
142411ca
L		 1746 if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1747 symtab_hdr, sym_hashes,
1748 &r_type, GOT_UNKNOWN,
1749 rel, relend, h))
1750 return FALSE;
1751
26e41594
AM		 1752 switch (r_type)
1753 {
1754 case R_X86_64_TLSLD:
1755 if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0)
1756 elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1;
1757 break;
c434dee6 1758
26e41594 1759 case R_X86_64_TLSGD:
67a4f2b7
AO		 1760 case R_X86_64_GOTPC32_TLSDESC:
1761 case R_X86_64_TLSDESC_CALL:
26e41594
AM		 1762 case R_X86_64_GOTTPOFF:
1763 case R_X86_64_GOT32:
1764 case R_X86_64_GOTPCREL:
7b81dfbb
AJ		 1765 case R_X86_64_GOT64:
1766 case R_X86_64_GOTPCREL64:
1767 case R_X86_64_GOTPLT64:
26e41594
AM		 1768 if (h != NULL)
1769 {
7b81dfbb
AJ		 1770 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
1771 h->plt.refcount -= 1;
26e41594
AM		 1772 if (h->got.refcount > 0)
1773 h->got.refcount -= 1;
1774 }
1775 else if (local_got_refcounts != NULL)
1776 {
1777 if (local_got_refcounts[r_symndx] > 0)
1778 local_got_refcounts[r_symndx] -= 1;
1779 }
1780 break;
c434dee6 1781
26e41594
AM		 1782 case R_X86_64_8:
1783 case R_X86_64_16:
1784 case R_X86_64_32:
1785 case R_X86_64_64:
1786 case R_X86_64_32S:
1787 case R_X86_64_PC8:
1788 case R_X86_64_PC16:
1789 case R_X86_64_PC32:
d6ab8113 1790 case R_X86_64_PC64:
26e41594
AM		 1791 if (info->shared)
1792 break;
1793 /* Fall thru */
c434dee6 1794
26e41594 1795 case R_X86_64_PLT32:
7b81dfbb 1796 case R_X86_64_PLTOFF64:
26e41594
AM		 1797 if (h != NULL)
1798 {
1799 if (h->plt.refcount > 0)
1800 h->plt.refcount -= 1;
1801 }
1802 break;
70256ad8 1803
26e41594
AM		 1804 default:
1805 break;
1806 }
1807 }
70256ad8 1808
b34976b6 1809 return TRUE;
70256ad8
AJ		 1810}
1811
1812/* Adjust a symbol defined by a dynamic object and referenced by a
1813 regular object. The current definition is in some section of the
1814 dynamic object, but we're not including those sections. We have to
1815 change the definition to something the rest of the link can
407443a3 1816 understand. */
70256ad8 1817
b34976b6 1818static bfd_boolean
27482721
AJ		 1819elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
1820 struct elf_link_hash_entry *h)
70256ad8 1821{
c434dee6 1822 struct elf64_x86_64_link_hash_table *htab;
70256ad8 1823 asection *s;
70256ad8 1824
cbe950e9
L		 1825 /* STT_GNU_IFUNC symbol must go through PLT. */
1826 if (h->type == STT_GNU_IFUNC)
1827 {
1828 if (h->plt.refcount <= 0)
1829 {
1830 h->plt.offset = (bfd_vma) -1;
1831 h->needs_plt = 0;
1832 }
1833 return TRUE;
1834 }
1835
70256ad8
AJ		 1836 /* If this is a function, put it in the procedure linkage table. We
1837 will fill in the contents of the procedure linkage table later,
1838 when we know the address of the .got section. */
1839 if (h->type == STT_FUNC
f5385ebf 1840 || h->needs_plt)
70256ad8 1841 {
c434dee6 1842 if (h->plt.refcount <= 0
27482721
AJ		 1843 || SYMBOL_CALLS_LOCAL (info, h)
1844 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1845 && h->root.type == bfd_link_hash_undefweak))
70256ad8 1846 {
70256ad8
AJ		 1847 /* This case can occur if we saw a PLT32 reloc in an input
1848 file, but the symbol was never referred to by a dynamic
1849 object, or if all references were garbage collected. In
1850 such a case, we don't actually need to build a procedure
1851 linkage table, and we can just do a PC32 reloc instead. */
70256ad8 1852 h->plt.offset = (bfd_vma) -1;
f5385ebf 1853 h->needs_plt = 0;
70256ad8
AJ		 1854 }
1855
b34976b6 1856 return TRUE;
70256ad8 1857 }
bbd7ec4a 1858 else
c434dee6
AJ		 1859 /* It's possible that we incorrectly decided a .plt reloc was
1860 needed for an R_X86_64_PC32 reloc to a non-function sym in
1861 check_relocs. We can't decide accurately between function and
1862 non-function syms in check-relocs; Objects loaded later in
1863 the link may change h->type. So fix it now. */
bbd7ec4a 1864 h->plt.offset = (bfd_vma) -1;
70256ad8
AJ		 1865
1866 /* If this is a weak symbol, and there is a real definition, the
1867 processor independent code will have arranged for us to see the
407443a3 1868 real definition first, and we can just use the same value. */
f6e332e6 1869 if (h->u.weakdef != NULL)
70256ad8 1870 {
f6e332e6
AM		 1871 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1872 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1873 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1874 h->root.u.def.value = h->u.weakdef->root.u.def.value;
d40d037c 1875 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
f6e332e6 1876 h->non_got_ref = h->u.weakdef->non_got_ref;
b34976b6 1877 return TRUE;
70256ad8
AJ		 1878 }
1879
1880 /* This is a reference to a symbol defined by a dynamic object which
407443a3 1881 is not a function. */
70256ad8
AJ		 1882
1883 /* If we are creating a shared library, we must presume that the
1884 only references to the symbol are via the global offset table.
1885 For such cases we need not do anything here; the relocations will
407443a3 1886 be handled correctly by relocate_section. */
70256ad8 1887 if (info->shared)
b34976b6 1888 return TRUE;
70256ad8
AJ		 1889
1890 /* If there are no references to this symbol that do not use the
1891 GOT, we don't need to generate a copy reloc. */
f5385ebf 1892 if (!h->non_got_ref)
b34976b6 1893 return TRUE;
70256ad8 1894
c434dee6
AJ		 1895 /* If -z nocopyreloc was given, we won't generate them either. */
1896 if (info->nocopyreloc)
1897 {
f5385ebf 1898 h->non_got_ref = 0;
b34976b6 1899 return TRUE;
c434dee6
AJ		 1900 }
1901
d40d037c 1902 if (ELIMINATE_COPY_RELOCS)
c434dee6 1903 {
d40d037c
AJ		 1904 struct elf64_x86_64_link_hash_entry * eh;
1905 struct elf64_x86_64_dyn_relocs *p;
c434dee6 1906
d40d037c
AJ		 1907 eh = (struct elf64_x86_64_link_hash_entry *) h;
1908 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1909 {
1910 s = p->sec->output_section;
1911 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1912 break;
1913 }
1914
1915 /* If we didn't find any dynamic relocs in read-only sections, then
1916 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1917 if (p == NULL)
1918 {
f5385ebf 1919 h->non_got_ref = 0;
d40d037c
AJ		 1920 return TRUE;
1921 }
c434dee6
AJ		 1922 }
1923
909272ee
AM		 1924 if (h->size == 0)
1925 {
1926 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1927 h->root.root.string);
1928 return TRUE;
1929 }
1930
70256ad8 1931 /* We must allocate the symbol in our .dynbss section, which will
407443a3 1932 become part of the .bss section of the executable. There will be
70256ad8
AJ		 1933 an entry for this symbol in the .dynsym section. The dynamic
1934 object will contain position independent code, so all references
1935 from the dynamic object to this symbol will go through the global
1936 offset table. The dynamic linker will use the .dynsym entry to
1937 determine the address it must put in the global offset table, so
1938 both the dynamic object and the regular object will refer to the
1939 same memory location for the variable. */
1940
c434dee6 1941 htab = elf64_x86_64_hash_table (info);
70256ad8
AJ		 1942
1943 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1944 to copy the initial value out of the dynamic object and into the
cedb70c5 1945 runtime process image. */
70256ad8
AJ		 1946 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1947 {
eea6121a 1948 htab->srelbss->size += sizeof (Elf64_External_Rela);
f5385ebf 1949 h->needs_copy = 1;
70256ad8
AJ		 1950 }
1951
c434dee6 1952 s = htab->sdynbss;
70256ad8 1953
027297b7 1954 return _bfd_elf_adjust_dynamic_copy (h, s);
70256ad8
AJ		 1955}
1956
c434dee6
AJ		 1957/* Allocate space in .plt, .got and associated reloc sections for
1958 dynamic relocs. */
1959
b34976b6 1960static bfd_boolean
eb4ff4d6 1961elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
c434dee6
AJ		 1962{
1963 struct bfd_link_info *info;
1964 struct elf64_x86_64_link_hash_table *htab;
1965 struct elf64_x86_64_link_hash_entry *eh;
1966 struct elf64_x86_64_dyn_relocs *p;
1967
e92d460e 1968 if (h->root.type == bfd_link_hash_indirect)
b34976b6 1969 return TRUE;
c434dee6 1970
e92d460e
AM		 1971 if (h->root.type == bfd_link_hash_warning)
1972 h = (struct elf_link_hash_entry *) h->root.u.i.link;
cbe950e9 1973 eh = (struct elf64_x86_64_link_hash_entry *) h;
e92d460e 1974
c434dee6
AJ		 1975 info = (struct bfd_link_info *) inf;
1976 htab = elf64_x86_64_hash_table (info);
1977
cbe950e9
L		 1978 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1979 here if it is defined and referenced in a non-shared object. */
1980 if (h->type == STT_GNU_IFUNC
1981 && h->def_regular)
1982 {
1983 asection *plt, *gotplt, *relplt;
1984
1985 /* Return and discard space for dynamic relocations against it if
1986 it is never referenced in a non-shared object. */
1987 if (!h->ref_regular)
1988 {
1989 if (h->plt.refcount > 0
1990 || h->got.refcount > 0)
1991 abort ();
1992 h->got.offset = (bfd_vma) -1;
1993 eh->dyn_relocs = NULL;
1994 return TRUE;
1995 }
1996
cbe950e9
L		 1997 /* When building a static executable, use .iplt, .igot.plt and
1998 .rela.iplt sections for STT_GNU_IFUNC symbols. */
710ab287 1999 if (htab->splt != NULL)
cbe950e9
L		 2000 {
2001 plt = htab->splt;
2002 gotplt = htab->sgotplt;
2003 relplt = htab->srelplt;
2004
2005 /* If this is the first .plt entry, make room for the special
2006 first entry. */
2007 if (plt->size == 0)
2008 plt->size += PLT_ENTRY_SIZE;
2009 }
2010 else
2011 {
2012 plt = htab->iplt;
2013 gotplt = htab->igotplt;
2014 relplt = htab->irelplt;
2015 }
2016
2017 /* Don't update value of STT_GNU_IFUNC symbol to PLT. We need
2018 the original value for R_X86_64_IRELATIVE. */
2019 h->plt.offset = plt->size;
2020
2021 /* Make room for this entry in the .plt/.iplt section. */
2022 plt->size += PLT_ENTRY_SIZE;
2023
2024 /* We also need to make an entry in the .got.plt/.got.iplt
2025 section, which will be placed in the .got section by the
2026 linker script. */
2027 gotplt->size += GOT_ENTRY_SIZE;
2028
2029 /* We also need to make an entry in the .rela.plt/.rela.iplt
2030 section. */
2031 relplt->size += sizeof (Elf64_External_Rela);
2032 relplt->reloc_count++;
2033
710ab287
L		 2034 /* We need dynamic relocation for STT_GNU_IFUNC symbol only
2035 when there is a non-GOT reference in a shared object. */
2036 if (!info->shared
2037 || !h->non_got_ref)
cbe950e9
L		 2038 eh->dyn_relocs = NULL;
2039
710ab287
L		 2040 /* Finally, allocate space. */
2041 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2a81c24a 2042 htab->irelifunc->size += p->count * sizeof (Elf64_External_Rela);
710ab287
L		 2043
2044 /* For STT_GNU_IFUNC symbol, .got.plt has the real function
2045 addres and .got has the PLT entry adddress. We will load
2046 the GOT entry with the PLT entry in finish_dynamic_symbol if
2047 it is used. For branch, it uses .got.plt. For symbol value,
2048 1. Use .got.plt in a shared object if it is forced local or
2049 not dynamic.
2050 2. Use .got.plt in a non-shared object if pointer equality
2051 isn't needed.
2052 3. Use .got.plt if .got isn't used.
2053 4. Otherwise use .got so that it can be shared among different
2054 objects at run-time.
2055 We only need to relocate .got entry in shared object. */
2056 if ((info->shared
2057 && (h->dynindx == -1
2058 || h->forced_local))
2059 || (!info->shared
2060 && !h->pointer_equality_needed)
2061 || htab->sgot == NULL)
2062 {
2063 /* Use .got.plt. */
2064 h->got.offset = (bfd_vma) -1;
2065 }
2066 else
2067 {
2068 h->got.offset = htab->sgot->size;
2069 htab->sgot->size += GOT_ENTRY_SIZE;
2070 if (info->shared)
2071 htab->srelgot->size += sizeof (Elf64_External_Rela);
0018b0a3 2072 }
710ab287
L		 2073
2074 return TRUE;
cbe950e9
L		 2075 }
2076 else if (htab->elf.dynamic_sections_created
2077 && h->plt.refcount > 0)
c434dee6
AJ		 2078 {
2079 /* Make sure this symbol is output as a dynamic symbol.
2080 Undefined weak syms won't yet be marked as dynamic. */
2081 if (h->dynindx == -1
f5385ebf 2082 && !h->forced_local)
c434dee6 2083 {
c152c796 2084 if (! bfd_elf_link_record_dynamic_symbol (info, h))
b34976b6 2085 return FALSE;
c434dee6
AJ		 2086 }
2087
27482721
AJ		 2088 if (info->shared
2089 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
c434dee6
AJ		 2090 {
2091 asection *s = htab->splt;
2092
2093 /* If this is the first .plt entry, make room for the special
2094 first entry. */
eea6121a
AM		 2095 if (s->size == 0)
2096 s->size += PLT_ENTRY_SIZE;
c434dee6 2097
eea6121a 2098 h->plt.offset = s->size;
c434dee6
AJ		 2099
2100 /* If this symbol is not defined in a regular file, and we are
2101 not generating a shared library, then set the symbol to this
2102 location in the .plt. This is required to make function
2103 pointers compare as equal between the normal executable and
2104 the shared library. */
2105 if (! info->shared
f5385ebf 2106 && !h->def_regular)
c434dee6
AJ		 2107 {
2108 h->root.u.def.section = s;
2109 h->root.u.def.value = h->plt.offset;
2110 }
2111
2112 /* Make room for this entry. */
eea6121a 2113 s->size += PLT_ENTRY_SIZE;
c434dee6
AJ		 2114
2115 /* We also need to make an entry in the .got.plt section, which
2116 will be placed in the .got section by the linker script. */
eea6121a 2117 htab->sgotplt->size += GOT_ENTRY_SIZE;
c434dee6
AJ		 2118
2119 /* We also need to make an entry in the .rela.plt section. */
eea6121a 2120 htab->srelplt->size += sizeof (Elf64_External_Rela);
67a4f2b7 2121 htab->srelplt->reloc_count++;
c434dee6
AJ		 2122 }
2123 else
2124 {
2125 h->plt.offset = (bfd_vma) -1;
f5385ebf 2126 h->needs_plt = 0;
c434dee6
AJ		 2127 }
2128 }
2129 else
2130 {
2131 h->plt.offset = (bfd_vma) -1;
f5385ebf 2132 h->needs_plt = 0;
c434dee6
AJ		 2133 }
2134
67a4f2b7
AO		 2135 eh->tlsdesc_got = (bfd_vma) -1;
2136
bffbf940
JJ		 2137 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2138 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2139 if (h->got.refcount > 0
2140 && !info->shared
2141 && h->dynindx == -1
2142 && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
d8045f23
NC		 2143 {
2144 h->got.offset = (bfd_vma) -1;
2145 }
bffbf940 2146 else if (h->got.refcount > 0)
c434dee6
AJ		 2147 {
2148 asection *s;
b34976b6 2149 bfd_boolean dyn;
bffbf940 2150 int tls_type = elf64_x86_64_hash_entry (h)->tls_type;
c434dee6
AJ		 2151
2152 /* Make sure this symbol is output as a dynamic symbol.
2153 Undefined weak syms won't yet be marked as dynamic. */
2154 if (h->dynindx == -1
f5385ebf 2155 && !h->forced_local)
c434dee6 2156 {
c152c796 2157 if (! bfd_elf_link_record_dynamic_symbol (info, h))
b34976b6 2158 return FALSE;
c434dee6
AJ		 2159 }
2160
67a4f2b7
AO		 2161 if (GOT_TLS_GDESC_P (tls_type))
2162 {
2163 eh->tlsdesc_got = htab->sgotplt->size
2164 - elf64_x86_64_compute_jump_table_size (htab);
2165 htab->sgotplt->size += 2 * GOT_ENTRY_SIZE;
2166 h->got.offset = (bfd_vma) -2;
2167 }
2168 if (! GOT_TLS_GDESC_P (tls_type)
2169 || GOT_TLS_GD_P (tls_type))
2170 {
2171 s = htab->sgot;
2172 h->got.offset = s->size;
2173 s->size += GOT_ENTRY_SIZE;
2174 if (GOT_TLS_GD_P (tls_type))
2175 s->size += GOT_ENTRY_SIZE;
2176 }
c434dee6 2177 dyn = htab->elf.dynamic_sections_created;
bffbf940
JJ		 2178 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2179 and two if global.
2180 R_X86_64_GOTTPOFF needs one dynamic relocation. */
67a4f2b7 2181 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
bffbf940 2182 || tls_type == GOT_TLS_IE)
eea6121a 2183 htab->srelgot->size += sizeof (Elf64_External_Rela);
67a4f2b7 2184 else if (GOT_TLS_GD_P (tls_type))
eea6121a 2185 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
67a4f2b7
AO		 2186 else if (! GOT_TLS_GDESC_P (tls_type)
2187 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2188 || h->root.type != bfd_link_hash_undefweak)
27482721
AJ		 2189 && (info->shared
2190 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
eea6121a 2191 htab->srelgot->size += sizeof (Elf64_External_Rela);
67a4f2b7
AO		 2192 if (GOT_TLS_GDESC_P (tls_type))
2193 {
2194 htab->srelplt->size += sizeof (Elf64_External_Rela);
2195 htab->tlsdesc_plt = (bfd_vma) -1;
2196 }
c434dee6
AJ		 2197 }
2198 else
2199 h->got.offset = (bfd_vma) -1;
2200
c434dee6 2201 if (eh->dyn_relocs == NULL)
b34976b6 2202 return TRUE;
c434dee6
AJ		 2203
2204 /* In the shared -Bsymbolic case, discard space allocated for
2205 dynamic pc-relative relocs against symbols which turn out to be
2206 defined in regular objects. For the normal shared case, discard
2207 space for pc-relative relocs that have become local due to symbol
2208 visibility changes. */
2209
2210 if (info->shared)
2211 {
27482721
AJ		 2212 /* Relocs that use pc_count are those that appear on a call
2213 insn, or certain REL relocs that can generated via assembly.
2214 We want calls to protected symbols to resolve directly to the
2215 function rather than going via the plt. If people want
2216 function pointer comparisons to work as expected then they
2217 should avoid writing weird assembly. */
2218 if (SYMBOL_CALLS_LOCAL (info, h))
c434dee6
AJ		 2219 {
2220 struct elf64_x86_64_dyn_relocs **pp;
2221
2222 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2223 {
2224 p->count -= p->pc_count;
2225 p->pc_count = 0;
2226 if (p->count == 0)
2227 *pp = p->next;
2228 else
2229 pp = &p->next;
2230 }
2231 }
4e795f50
AM		 2232
2233 /* Also discard relocs on undefined weak syms with non-default
2234 visibility. */
22d606e9 2235 if (eh->dyn_relocs != NULL
4e795f50 2236 && h->root.type == bfd_link_hash_undefweak)
22d606e9
AM		 2237 {
2238 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2239 eh->dyn_relocs = NULL;
2240
2241 /* Make sure undefined weak symbols are output as a dynamic
2242 symbol in PIEs. */
2243 else if (h->dynindx == -1
d8045f23
NC		 2244 && ! h->forced_local
2245 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2246 return FALSE;
22d606e9 2247 }
cbe950e9 2248
d8045f23 2249 }
d40d037c 2250 else if (ELIMINATE_COPY_RELOCS)
c434dee6
AJ		 2251 {
2252 /* For the non-shared case, discard space for relocs against
2253 symbols which turn out to need copy relocs or are not
2254 dynamic. */
2255
f5385ebf
AM		 2256 if (!h->non_got_ref
2257 && ((h->def_dynamic
2258 && !h->def_regular)
c434dee6
AJ		 2259 || (htab->elf.dynamic_sections_created
2260 && (h->root.type == bfd_link_hash_undefweak
2261 || h->root.type == bfd_link_hash_undefined))))
2262 {
2263 /* Make sure this symbol is output as a dynamic symbol.
2264 Undefined weak syms won't yet be marked as dynamic. */
2265 if (h->dynindx == -1
d8045f23
NC		 2266 && ! h->forced_local
2267 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2268 return FALSE;
c434dee6
AJ		 2269
2270 /* If that succeeded, we know we'll be keeping all the
2271 relocs. */
2272 if (h->dynindx != -1)
2273 goto keep;
2274 }
2275
2276 eh->dyn_relocs = NULL;
2277
2278 keep: ;
2279 }
2280
2281 /* Finally, allocate space. */
2282 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2283 {
e7c33416
NC		 2284 asection * sreloc;
2285
cbe950e9 2286 sreloc = elf_section_data (p->sec)->sreloc;
e7c33416
NC		 2287
2288 BFD_ASSERT (sreloc != NULL);
2289
eea6121a 2290 sreloc->size += p->count * sizeof (Elf64_External_Rela);
c434dee6
AJ		 2291 }
2292
b34976b6 2293 return TRUE;
c434dee6
AJ		 2294}
2295
c25bc9fc
L		 2296/* Allocate space in .plt, .got and associated reloc sections for
2297 local dynamic relocs. */
2298
2299static bfd_boolean
2300elf64_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2301{
2302 struct elf_link_hash_entry *h
2303 = (struct elf_link_hash_entry *) *slot;
2304
2305 if (h->type != STT_GNU_IFUNC
2306 || !h->def_regular
2307 || !h->ref_regular
2308 || !h->forced_local
2309 || h->root.type != bfd_link_hash_defined)
2310 abort ();
2311
2312 return elf64_x86_64_allocate_dynrelocs (h, inf);
2313}
2314
c434dee6
AJ		 2315/* Find any dynamic relocs that apply to read-only sections. */
2316
b34976b6 2317static bfd_boolean
eb4ff4d6 2318elf64_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
c434dee6
AJ		 2319{
2320 struct elf64_x86_64_link_hash_entry *eh;
2321 struct elf64_x86_64_dyn_relocs *p;
2322
e92d460e
AM		 2323 if (h->root.type == bfd_link_hash_warning)
2324 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2325
c434dee6
AJ		 2326 eh = (struct elf64_x86_64_link_hash_entry *) h;
2327 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2328 {
2329 asection *s = p->sec->output_section;
2330
2331 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2332 {
2333 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2334
2335 info->flags |= DF_TEXTREL;
2336
2337 /* Not an error, just cut short the traversal. */
b34976b6 2338 return FALSE;
c434dee6
AJ		 2339 }
2340 }
b34976b6 2341 return TRUE;
c434dee6
AJ		 2342}
2343
70256ad8
AJ		 2344/* Set the sizes of the dynamic sections. */
2345
b34976b6 2346static bfd_boolean
27482721
AJ		 2347elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2348 struct bfd_link_info *info)
70256ad8 2349{
c434dee6 2350 struct elf64_x86_64_link_hash_table *htab;
70256ad8
AJ		 2351 bfd *dynobj;
2352 asection *s;
b34976b6 2353 bfd_boolean relocs;
c434dee6 2354 bfd *ibfd;
70256ad8 2355
c434dee6
AJ		 2356 htab = elf64_x86_64_hash_table (info);
2357 dynobj = htab->elf.dynobj;
2358 if (dynobj == NULL)
2359 abort ();
70256ad8 2360
c434dee6 2361 if (htab->elf.dynamic_sections_created)
70256ad8
AJ		 2362 {
2363 /* Set the contents of the .interp section to the interpreter. */
36af4a4e 2364 if (info->executable)
70256ad8
AJ		 2365 {
2366 s = bfd_get_section_by_name (dynobj, ".interp");
c434dee6
AJ		 2367 if (s == NULL)
2368 abort ();
eea6121a 2369 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
70256ad8
AJ		 2370 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2371 }
2372 }
70256ad8 2373
c434dee6
AJ		 2374 /* Set up .got offsets for local syms, and space for local dynamic
2375 relocs. */
2376 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
70256ad8 2377 {
c434dee6
AJ		 2378 bfd_signed_vma *local_got;
2379 bfd_signed_vma *end_local_got;
bffbf940 2380 char *local_tls_type;
67a4f2b7 2381 bfd_vma *local_tlsdesc_gotent;
c434dee6
AJ		 2382 bfd_size_type locsymcount;
2383 Elf_Internal_Shdr *symtab_hdr;
2384 asection *srel;
70256ad8 2385
0ffa91dd 2386 if (! is_x86_64_elf (ibfd))
70256ad8
AJ		 2387 continue;
2388
c434dee6 2389 for (s = ibfd->sections; s != NULL; s = s->next)
70256ad8 2390 {
c434dee6
AJ		 2391 struct elf64_x86_64_dyn_relocs *p;
2392
e81d3500
DD		 2393 for (p = (struct elf64_x86_64_dyn_relocs *)
2394 (elf_section_data (s)->local_dynrel);
c434dee6
AJ		 2395 p != NULL;
2396 p = p->next)
70256ad8 2397 {
c434dee6
AJ		 2398 if (!bfd_is_abs_section (p->sec)
2399 && bfd_is_abs_section (p->sec->output_section))
2400 {
2401 /* Input section has been discarded, either because
2402 it is a copy of a linkonce section or due to
2403 linker script /DISCARD/, so we'll be discarding
2404 the relocs too. */
2405 }
2406 else if (p->count != 0)
2407 {
2408 srel = elf_section_data (p->sec)->sreloc;
eea6121a 2409 srel->size += p->count * sizeof (Elf64_External_Rela);
c434dee6
AJ		 2410 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2411 info->flags |= DF_TEXTREL;
c434dee6 2412 }
70256ad8
AJ		 2413 }
2414 }
c434dee6
AJ		 2415
2416 local_got = elf_local_got_refcounts (ibfd);
2417 if (!local_got)
2418 continue;
2419
0ffa91dd 2420 symtab_hdr = &elf_symtab_hdr (ibfd);
c434dee6
AJ		 2421 locsymcount = symtab_hdr->sh_info;
2422 end_local_got = local_got + locsymcount;
bffbf940 2423 local_tls_type = elf64_x86_64_local_got_tls_type (ibfd);
67a4f2b7 2424 local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd);
c434dee6
AJ		 2425 s = htab->sgot;
2426 srel = htab->srelgot;
67a4f2b7
AO		 2427 for (; local_got < end_local_got;
2428 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
70256ad8 2429 {
67a4f2b7 2430 *local_tlsdesc_gotent = (bfd_vma) -1;
c434dee6 2431 if (*local_got > 0)
70256ad8 2432 {
67a4f2b7
AO		 2433 if (GOT_TLS_GDESC_P (*local_tls_type))
2434 {
2435 *local_tlsdesc_gotent = htab->sgotplt->size
2436 - elf64_x86_64_compute_jump_table_size (htab);
2437 htab->sgotplt->size += 2 * GOT_ENTRY_SIZE;
2438 *local_got = (bfd_vma) -2;
2439 }
2440 if (! GOT_TLS_GDESC_P (*local_tls_type)
2441 || GOT_TLS_GD_P (*local_tls_type))
2442 {
2443 *local_got = s->size;
2444 s->size += GOT_ENTRY_SIZE;
2445 if (GOT_TLS_GD_P (*local_tls_type))
2446 s->size += GOT_ENTRY_SIZE;
2447 }
bffbf940 2448 if (info->shared
67a4f2b7 2449 || GOT_TLS_GD_ANY_P (*local_tls_type)
bffbf940 2450 || *local_tls_type == GOT_TLS_IE)
67a4f2b7
AO		 2451 {
2452 if (GOT_TLS_GDESC_P (*local_tls_type))
2453 {
2454 htab->srelplt->size += sizeof (Elf64_External_Rela);
2455 htab->tlsdesc_plt = (bfd_vma) -1;
2456 }
2457 if (! GOT_TLS_GDESC_P (*local_tls_type)
2458 || GOT_TLS_GD_P (*local_tls_type))
2459 srel->size += sizeof (Elf64_External_Rela);
2460 }
70256ad8
AJ		 2461 }
2462 else
c434dee6
AJ		 2463 *local_got = (bfd_vma) -1;
2464 }
2465 }
70256ad8 2466
bffbf940
JJ		 2467 if (htab->tls_ld_got.refcount > 0)
2468 {
2469 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2470 relocs. */
eea6121a
AM		 2471 htab->tls_ld_got.offset = htab->sgot->size;
2472 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
2473 htab->srelgot->size += sizeof (Elf64_External_Rela);
bffbf940
JJ		 2474 }
2475 else
2476 htab->tls_ld_got.offset = -1;
2477
c434dee6
AJ		 2478 /* Allocate global sym .plt and .got entries, and space for global
2479 sym dynamic relocs. */
eb4ff4d6
L		 2480 elf_link_hash_traverse (&htab->elf, elf64_x86_64_allocate_dynrelocs,
2481 info);
c434dee6 2482
c25bc9fc
L		 2483 /* Allocate .plt and .got entries, and space for local symbols. */
2484 htab_traverse (htab->loc_hash_table,
2485 elf64_x86_64_allocate_local_dynrelocs,
2486 info);
2487
67a4f2b7
AO		 2488 /* For every jump slot reserved in the sgotplt, reloc_count is
2489 incremented. However, when we reserve space for TLS descriptors,
2490 it's not incremented, so in order to compute the space reserved
2491 for them, it suffices to multiply the reloc count by the jump
2492 slot size. */
2493 if (htab->srelplt)
2494 htab->sgotplt_jump_table_size
2495 = elf64_x86_64_compute_jump_table_size (htab);
2496
2497 if (htab->tlsdesc_plt)
2498 {
2499 /* If we're not using lazy TLS relocations, don't generate the
2500 PLT and GOT entries they require. */
2501 if ((info->flags & DF_BIND_NOW))
2502 htab->tlsdesc_plt = 0;
2503 else
2504 {
2505 htab->tlsdesc_got = htab->sgot->size;
2506 htab->sgot->size += GOT_ENTRY_SIZE;
2507 /* Reserve room for the initial entry.
2508 FIXME: we could probably do away with it in this case. */
2509 if (htab->splt->size == 0)
2510 htab->splt->size += PLT_ENTRY_SIZE;
2511 htab->tlsdesc_plt = htab->splt->size;
2512 htab->splt->size += PLT_ENTRY_SIZE;
2513 }
2514 }
2515
c434dee6
AJ		 2516 /* We now have determined the sizes of the various dynamic sections.
2517 Allocate memory for them. */
b34976b6 2518 relocs = FALSE;
c434dee6
AJ		 2519 for (s = dynobj->sections; s != NULL; s = s->next)
2520 {
2521 if ((s->flags & SEC_LINKER_CREATED) == 0)
2522 continue;
2523
2524 if (s == htab->splt
2525 || s == htab->sgot
75ff4589 2526 || s == htab->sgotplt
cbe950e9
L		 2527 || s == htab->iplt
2528 || s == htab->igotplt
75ff4589 2529 || s == htab->sdynbss)
c434dee6
AJ		 2530 {
2531 /* Strip this section if we don't need it; see the
2532 comment below. */
2533 }
0112cd26 2534 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
c434dee6 2535 {
eea6121a 2536 if (s->size != 0 && s != htab->srelplt)
b34976b6 2537 relocs = TRUE;
c434dee6
AJ		 2538
2539 /* We use the reloc_count field as a counter if we need
2540 to copy relocs into the output file. */
67a4f2b7
AO		 2541 if (s != htab->srelplt)
2542 s->reloc_count = 0;
70256ad8 2543 }
c434dee6 2544 else
70256ad8
AJ		 2545 {
2546 /* It's not one of our sections, so don't allocate space. */
2547 continue;
2548 }
2549
eea6121a 2550 if (s->size == 0)
70256ad8 2551 {
c434dee6
AJ		 2552 /* If we don't need this section, strip it from the
2553 output file. This is mostly to handle .rela.bss and
2554 .rela.plt. We must create both sections in
2555 create_dynamic_sections, because they must be created
2556 before the linker maps input sections to output
2557 sections. The linker does that before
2558 adjust_dynamic_symbol is called, and it is that
2559 function which decides whether anything needs to go
2560 into these sections. */
2561
8423293d 2562 s->flags |= SEC_EXCLUDE;
70256ad8
AJ		 2563 continue;
2564 }
2565
c456f082
AM		 2566 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2567 continue;
2568
70256ad8
AJ		 2569 /* Allocate memory for the section contents. We use bfd_zalloc
2570 here in case unused entries are not reclaimed before the
2571 section's contents are written out. This should not happen,
2572 but this way if it does, we get a R_X86_64_NONE reloc instead
2573 of garbage. */
eea6121a 2574 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
c434dee6 2575 if (s->contents == NULL)
b34976b6 2576 return FALSE;
70256ad8
AJ		 2577 }
2578
c434dee6 2579 if (htab->elf.dynamic_sections_created)
70256ad8
AJ		 2580 {
2581 /* Add some entries to the .dynamic section. We fill in the
2582 values later, in elf64_x86_64_finish_dynamic_sections, but we
2583 must add the entries now so that we get the correct size for
407443a3 2584 the .dynamic section. The DT_DEBUG entry is filled in by the
70256ad8 2585 dynamic linker and used by the debugger. */
dc810e39 2586#define add_dynamic_entry(TAG, VAL) \
5a580b3a 2587 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
dc810e39 2588
36af4a4e 2589 if (info->executable)
70256ad8 2590 {
dc810e39 2591 if (!add_dynamic_entry (DT_DEBUG, 0))
b34976b6 2592 return FALSE;
70256ad8
AJ		 2593 }
2594
eea6121a 2595 if (htab->splt->size != 0)
70256ad8 2596 {
dc810e39
AM		 2597 if (!add_dynamic_entry (DT_PLTGOT, 0)
2598 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2599 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2600 || !add_dynamic_entry (DT_JMPREL, 0))
b34976b6 2601 return FALSE;
67a4f2b7
AO		 2602
2603 if (htab->tlsdesc_plt
2604 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
2605 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
2606 return FALSE;
70256ad8
AJ		 2607 }
2608
2609 if (relocs)
2610 {
dc810e39
AM		 2611 if (!add_dynamic_entry (DT_RELA, 0)
2612 || !add_dynamic_entry (DT_RELASZ, 0)
2613 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
b34976b6 2614 return FALSE;
70256ad8 2615
c434dee6
AJ		 2616 /* If any dynamic relocs apply to a read-only section,
2617 then we need a DT_TEXTREL entry. */
2618 if ((info->flags & DF_TEXTREL) == 0)
eb4ff4d6
L		 2619 elf_link_hash_traverse (&htab->elf,
2620 elf64_x86_64_readonly_dynrelocs,
2621 info);
c434dee6
AJ		 2622
2623 if ((info->flags & DF_TEXTREL) != 0)
2624 {
2625 if (!add_dynamic_entry (DT_TEXTREL, 0))
b34976b6 2626 return FALSE;
c434dee6 2627 }
70256ad8
AJ		 2628 }
2629 }
dc810e39 2630#undef add_dynamic_entry
70256ad8 2631
b34976b6 2632 return TRUE;
70256ad8
AJ		 2633}
2634
67a4f2b7
AO		 2635static bfd_boolean
2636elf64_x86_64_always_size_sections (bfd *output_bfd,
2637 struct bfd_link_info *info)
2638{
2639 asection *tls_sec = elf_hash_table (info)->tls_sec;
2640
2641 if (tls_sec)
2642 {
2643 struct elf_link_hash_entry *tlsbase;
2644
2645 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2646 "_TLS_MODULE_BASE_",
2647 FALSE, FALSE, FALSE);
2648
2649 if (tlsbase && tlsbase->type == STT_TLS)
2650 {
2651 struct bfd_link_hash_entry *bh = NULL;
2652 const struct elf_backend_data *bed
2653 = get_elf_backend_data (output_bfd);
2654
2655 if (!(_bfd_generic_link_add_one_symbol
2656 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2657 tls_sec, 0, NULL, FALSE,
2658 bed->collect, &bh)))
2659 return FALSE;
9f03412a
AO		 2660
2661 elf64_x86_64_hash_table (info)->tls_module_base = bh;
2662
67a4f2b7
AO		 2663 tlsbase = (struct elf_link_hash_entry *)bh;
2664 tlsbase->def_regular = 1;
2665 tlsbase->other = STV_HIDDEN;
2666 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2667 }
2668 }
2669
2670 return TRUE;
2671}
2672
9f03412a
AO		 2673/* _TLS_MODULE_BASE_ needs to be treated especially when linking
2674 executables. Rather than setting it to the beginning of the TLS
2675 section, we have to set it to the end. This function may be called
2676 multiple times, it is idempotent. */
2677
2678static void
eb4ff4d6 2679elf64_x86_64_set_tls_module_base (struct bfd_link_info *info)
9f03412a
AO		 2680{
2681 struct bfd_link_hash_entry *base;
2682
2683 if (!info->executable)
2684 return;
2685
2686 base = elf64_x86_64_hash_table (info)->tls_module_base;
2687
2688 if (!base)
2689 return;
2690
2691 base->u.def.value = elf_hash_table (info)->tls_size;
2692}
2693
bffbf940
JJ		 2694/* Return the base VMA address which should be subtracted from real addresses
2695 when resolving @dtpoff relocation.
2696 This is PT_TLS segment p_vaddr. */
2697
2698static bfd_vma
eb4ff4d6 2699elf64_x86_64_dtpoff_base (struct bfd_link_info *info)
bffbf940 2700{
e1918d23
AM		 2701 /* If tls_sec is NULL, we should have signalled an error already. */
2702 if (elf_hash_table (info)->tls_sec == NULL)
bffbf940 2703 return 0;
e1918d23 2704 return elf_hash_table (info)->tls_sec->vma;
bffbf940
JJ		 2705}
2706
2707/* Return the relocation value for @tpoff relocation
2708 if STT_TLS virtual address is ADDRESS. */
2709
2710static bfd_vma
eb4ff4d6 2711elf64_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
bffbf940 2712{
e1918d23 2713 struct elf_link_hash_table *htab = elf_hash_table (info);
bffbf940
JJ		 2714
2715 /* If tls_segment is NULL, we should have signalled an error already. */
e1918d23 2716 if (htab->tls_sec == NULL)
bffbf940 2717 return 0;
e1918d23 2718 return address - htab->tls_size - htab->tls_sec->vma;
bffbf940
JJ		 2719}
2720
90f487df
L		 2721/* Is the instruction before OFFSET in CONTENTS a 32bit relative
2722 branch? */
2723
2724static bfd_boolean
2725is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
2726{
2727 /* Opcode Instruction
2728 0xe8 call
2729 0xe9 jump
2730 0x0f 0x8x conditional jump */
2731 return ((offset > 0
2732 && (contents [offset - 1] == 0xe8
2733 || contents [offset - 1] == 0xe9))
2734 || (offset > 1
2735 && contents [offset - 2] == 0x0f
2736 && (contents [offset - 1] & 0xf0) == 0x80));
2737}
2738
8d88c4ca
NC		 2739/* Relocate an x86_64 ELF section. */
2740
b34976b6 2741static bfd_boolean
27482721
AJ		 2742elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
2743 bfd *input_bfd, asection *input_section,
2744 bfd_byte *contents, Elf_Internal_Rela *relocs,
2745 Elf_Internal_Sym *local_syms,
2746 asection **local_sections)
8d88c4ca 2747{
c434dee6 2748 struct elf64_x86_64_link_hash_table *htab;
8d88c4ca
NC		 2749 Elf_Internal_Shdr *symtab_hdr;
2750 struct elf_link_hash_entry **sym_hashes;
2751 bfd_vma *local_got_offsets;
67a4f2b7 2752 bfd_vma *local_tlsdesc_gotents;
c434dee6 2753 Elf_Internal_Rela *rel;
8d88c4ca
NC		 2754 Elf_Internal_Rela *relend;
2755
0ffa91dd
NC		 2756 BFD_ASSERT (is_x86_64_elf (input_bfd));
2757
c434dee6 2758 htab = elf64_x86_64_hash_table (info);
0ffa91dd 2759 symtab_hdr = &elf_symtab_hdr (input_bfd);
8d88c4ca
NC		 2760 sym_hashes = elf_sym_hashes (input_bfd);
2761 local_got_offsets = elf_local_got_offsets (input_bfd);
67a4f2b7 2762 local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd);
8d88c4ca 2763
eb4ff4d6 2764 elf64_x86_64_set_tls_module_base (info);
9f03412a 2765
c434dee6 2766 rel = relocs;
8d88c4ca 2767 relend = relocs + input_section->reloc_count;
c434dee6 2768 for (; rel < relend; rel++)
8d88c4ca 2769 {
bffbf940 2770 unsigned int r_type;
8d88c4ca
NC		 2771 reloc_howto_type *howto;
2772 unsigned long r_symndx;
2773 struct elf_link_hash_entry *h;
2774 Elf_Internal_Sym *sym;
2775 asection *sec;
67a4f2b7 2776 bfd_vma off, offplt;
8d88c4ca 2777 bfd_vma relocation;
b34976b6 2778 bfd_boolean unresolved_reloc;
8d88c4ca 2779 bfd_reloc_status_type r;
bffbf940 2780 int tls_type;
cbe950e9 2781 asection *base_got;
8d88c4ca 2782
c434dee6 2783 r_type = ELF64_R_TYPE (rel->r_info);
fe4770f4
AJ		 2784 if (r_type == (int) R_X86_64_GNU_VTINHERIT
2785 || r_type == (int) R_X86_64_GNU_VTENTRY)
2786 continue;
8d88c4ca 2787
bffbf940 2788 if (r_type >= R_X86_64_max)
8da6118f
KH		 2789 {
2790 bfd_set_error (bfd_error_bad_value);
b34976b6 2791 return FALSE;
8da6118f 2792 }
8d88c4ca 2793
b491616a 2794 howto = x86_64_elf_howto_table + r_type;
c434dee6 2795 r_symndx = ELF64_R_SYM (rel->r_info);
8d88c4ca
NC		 2796 h = NULL;
2797 sym = NULL;
2798 sec = NULL;
b34976b6 2799 unresolved_reloc = FALSE;
8d88c4ca 2800 if (r_symndx < symtab_hdr->sh_info)
8da6118f
KH		 2801 {
2802 sym = local_syms + r_symndx;
2803 sec = local_sections[r_symndx];
c434dee6 2804
c25bc9fc
L		 2805 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
2806 &sec, rel);
2807
2808 /* Relocate against local STT_GNU_IFUNC symbol. */
2809 if (ELF64_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2810 {
2811 h = elf64_x86_64_get_local_sym_hash (htab, input_bfd,
2812 rel, FALSE);
2813 if (h == NULL)
2814 abort ();
2815
2816 /* Set STT_GNU_IFUNC symbol value. */
2817 h->root.u.def.value = sym->st_value;
2818 h->root.u.def.section = sec;
2819 }
8da6118f 2820 }
8d88c4ca 2821 else
8da6118f 2822 {
560e09e9 2823 bfd_boolean warned;
c434dee6 2824
b2a8e766
AM		 2825 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2826 r_symndx, symtab_hdr, sym_hashes,
2827 h, sec, relocation,
2828 unresolved_reloc, warned);
8da6118f 2829 }
ab96bf03
AM		 2830
2831 if (sec != NULL && elf_discarded_section (sec))
2832 {
2833 /* For relocs against symbols from removed linkonce sections,
2834 or sections discarded by a linker script, we just want the
2835 section contents zeroed. Avoid any special processing. */
2836 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2837 rel->r_info = 0;
2838 rel->r_addend = 0;
2839 continue;
2840 }
2841
2842 if (info->relocatable)
2843 continue;
2844
cbe950e9
L		 2845 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2846 it here if it is defined in a non-shared object. */
2847 if (h != NULL
2848 && h->type == STT_GNU_IFUNC
2849 && h->def_regular)
2850 {
2851 asection *plt;
2852 bfd_vma plt_index;
2853
2854 if ((input_section->flags & SEC_ALLOC) == 0
2855 || h->plt.offset == (bfd_vma) -1)
2856 abort ();
2857
2858 /* STT_GNU_IFUNC symbol must go through PLT. */
2859 plt = htab->splt ? htab->splt : htab->iplt;
2860 relocation = (plt->output_section->vma
2861 + plt->output_offset + h->plt.offset);
2862
2863 switch (r_type)
2864 {
2865 default:
2866 (*_bfd_error_handler)
2867 (_("%B: relocation %s against STT_GNU_IFUNC "
2868 "symbol `%s' isn't handled by %s"), input_bfd,
2869 x86_64_elf_howto_table[r_type].name,
2870 h->root.root.string, __FUNCTION__);
2871 bfd_set_error (bfd_error_bad_value);
2872 return FALSE;
2873
2874 case R_X86_64_32S:
710ab287 2875 if (info->shared)
cbe950e9 2876 abort ();
710ab287
L		 2877 goto do_relocation;
2878
2879 case R_X86_64_64:
2880 if (rel->r_addend != 0)
2881 {
2882 (*_bfd_error_handler)
2883 (_("%B: relocation %s against STT_GNU_IFUNC "
2884 "symbol `%s' has non-zero addend: %d"),
2885 input_bfd, x86_64_elf_howto_table[r_type].name,
2886 h->root.root.string, rel->r_addend);
2887 bfd_set_error (bfd_error_bad_value);
2888 return FALSE;
2889 }
2890
2891 /* Generate dynamic relcoation only when there is a
2892 non-GOF reference in a shared object. */
2893 if (info->shared && h->non_got_ref)
2894 {
2895 Elf_Internal_Rela outrel;
2896 bfd_byte *loc;
2897 asection *sreloc;
2898
c25bc9fc
L		 2899 /* Need a dynamic relocation to get the real function
2900 address. */
710ab287
L		 2901 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2902 info,
2903 input_section,
2904 rel->r_offset);
2905 if (outrel.r_offset == (bfd_vma) -1
2906 || outrel.r_offset == (bfd_vma) -2)
2907 abort ();
2908
2909 outrel.r_offset += (input_section->output_section->vma
2910 + input_section->output_offset);
2911
2912 if (h->dynindx == -1
2913 || h->forced_local)
2914 {
2915 /* This symbol is resolved locally. */
2916 outrel.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
2917 outrel.r_addend = (h->root.u.def.value
2918 + h->root.u.def.section->output_section->vma
2919 + h->root.u.def.section->output_offset);
2920 }
2921 else
2922 {
2923 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2924 outrel.r_addend = 0;
2925 }
2926
2a81c24a 2927 sreloc = htab->irelifunc;
710ab287
L		 2928 loc = sreloc->contents;
2929 loc += (sreloc->reloc_count++
2930 * sizeof (Elf64_External_Rela));
2931 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2932
2933 /* If this reloc is against an external symbol, we
2934 do not want to fiddle with the addend. Otherwise,
2935 we need to include the symbol value so that it
2936 becomes an addend for the dynamic reloc. For an
2937 internal symbol, we have updated addend. */
2938 continue;
2939 }
cbe950e9
L		 2940
2941 case R_X86_64_32:
cbe950e9
L		 2942 case R_X86_64_PC32:
2943 case R_X86_64_PC64:
2944 case R_X86_64_PLT32:
2945 goto do_relocation;
2946
2947 case R_X86_64_GOTPCREL:
2948 case R_X86_64_GOTPCREL64:
2949 base_got = htab->sgot;
2950 off = h->got.offset;
2951
7afd84dc 2952 if (base_got == NULL)
cbe950e9
L		 2953 abort ();
2954
7afd84dc 2955 if (off == (bfd_vma) -1)
cbe950e9 2956 {
7afd84dc
L		 2957 /* We can't use h->got.offset here to save state, or
2958 even just remember the offset, as finish_dynamic_symbol
2959 would use that as offset into .got. */
cbe950e9 2960
7afd84dc
L		 2961 if (htab->splt != NULL)
2962 {
2963 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2964 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2965 base_got = htab->sgotplt;
2966 }
cbe950e9
L		 2967 else
2968 {
7afd84dc
L		 2969 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2970 off = plt_index * GOT_ENTRY_SIZE;
2971 base_got = htab->igotplt;
2972 }
2973
2974 if (h->dynindx == -1
2975 || h->forced_local
2976 || info->symbolic)
2977 {
2978 /* This references the local defitionion. We must
2979 initialize this entry in the global offset table.
2980 Since the offset must always be a multiple of 8,
2981 we use the least significant bit to record
2982 whether we have initialized it already.
2983
2984 When doing a dynamic link, we create a .rela.got
2985 relocation entry to initialize the value. This
2986 is done in the finish_dynamic_symbol routine. */
2987 if ((off & 1) != 0)
2988 off &= ~1;
2989 else
2990 {
2991 bfd_put_64 (output_bfd, relocation,
2992 base_got->contents + off);
2993 /* Note that this is harmless for the GOTPLT64
2994 case, as -1 | 1 still is -1. */
2995 h->got.offset |= 1;
2996 }
cbe950e9
L		 2997 }
2998 }
2999
3000 relocation = (base_got->output_section->vma
3001 + base_got->output_offset + off);
3002
3003 if (r_type != R_X86_64_GOTPCREL
3004 && r_type != R_X86_64_GOTPCREL64)
3005 {
3006 asection *gotplt;
3007 if (htab->splt != NULL)
3008 gotplt = htab->sgotplt;
3009 else
3010 gotplt = htab->igotplt;
3011 relocation -= (gotplt->output_section->vma
3012 - gotplt->output_offset);
3013 }
3014
3015 goto do_relocation;
3016 }
3017 }
3018
70256ad8
AJ		 3019 /* When generating a shared object, the relocations handled here are
3020 copied into the output file to be resolved at run time. */
3021 switch (r_type)
3022 {
3023 case R_X86_64_GOT32:
7b81dfbb 3024 case R_X86_64_GOT64:
70256ad8
AJ		 3025 /* Relocation is to the entry for this symbol in the global
3026 offset table. */
70256ad8 3027 case R_X86_64_GOTPCREL:
7b81dfbb
AJ		 3028 case R_X86_64_GOTPCREL64:
3029 /* Use global offset table entry as symbol value. */
3030 case R_X86_64_GOTPLT64:
3031 /* This is the same as GOT64 for relocation purposes, but
3032 indicates the existence of a PLT entry. The difficulty is,
3033 that we must calculate the GOT slot offset from the PLT
3034 offset, if this symbol got a PLT entry (it was global).
3035 Additionally if it's computed from the PLT entry, then that
3036 GOT offset is relative to .got.plt, not to .got. */
3037 base_got = htab->sgot;
3038
c434dee6
AJ		 3039 if (htab->sgot == NULL)
3040 abort ();
053579d7 3041
51e0a107 3042 if (h != NULL)
70256ad8 3043 {
b34976b6 3044 bfd_boolean dyn;
c434dee6
AJ		 3045
3046 off = h->got.offset;
7b81dfbb
AJ		 3047 if (h->needs_plt
3048 && h->plt.offset != (bfd_vma)-1
3049 && off == (bfd_vma)-1)
3050 {
3051 /* We can't use h->got.offset here to save
3052 state, or even just remember the offset, as
3053 finish_dynamic_symbol would use that as offset into
3054 .got. */
3055 bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3056 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3057 base_got = htab->sgotplt;
3058 }
3059
c434dee6 3060 dyn = htab->elf.dynamic_sections_created;
51e0a107 3061
27482721 3062 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
51e0a107 3063 || (info->shared
27482721 3064 && SYMBOL_REFERENCES_LOCAL (info, h))
4bc6e03a
AJ		 3065 || (ELF_ST_VISIBILITY (h->other)
3066 && h->root.type == bfd_link_hash_undefweak))
51e0a107
JH		 3067 {
3068 /* This is actually a static link, or it is a -Bsymbolic
3069 link and the symbol is defined locally, or the symbol
407443a3 3070 was forced to be local because of a version file. We
51e0a107
JH		 3071 must initialize this entry in the global offset table.
3072 Since the offset must always be a multiple of 8, we
3073 use the least significant bit to record whether we
3074 have initialized it already.
3075
3076 When doing a dynamic link, we create a .rela.got
407443a3
AJ		 3077 relocation entry to initialize the value. This is
3078 done in the finish_dynamic_symbol routine. */
51e0a107
JH		 3079 if ((off & 1) != 0)
3080 off &= ~1;
3081 else
3082 {
3083 bfd_put_64 (output_bfd, relocation,
7b81dfbb
AJ		 3084 base_got->contents + off);
3085 /* Note that this is harmless for the GOTPLT64 case,
3086 as -1 | 1 still is -1. */
51e0a107
JH		 3087 h->got.offset |= 1;
3088 }
3089 }
053579d7 3090 else
b34976b6 3091 unresolved_reloc = FALSE;
70256ad8 3092 }
51e0a107
JH		 3093 else
3094 {
c434dee6
AJ		 3095 if (local_got_offsets == NULL)
3096 abort ();
51e0a107
JH		 3097
3098 off = local_got_offsets[r_symndx];
3099
3100 /* The offset must always be a multiple of 8. We use
407443a3
AJ		 3101 the least significant bit to record whether we have
3102 already generated the necessary reloc. */
51e0a107
JH		 3103 if ((off & 1) != 0)
3104 off &= ~1;
3105 else
3106 {
c434dee6 3107 bfd_put_64 (output_bfd, relocation,
7b81dfbb 3108 base_got->contents + off);
51e0a107
JH		 3109
3110 if (info->shared)
3111 {
947216bf 3112 asection *s;
51e0a107 3113 Elf_Internal_Rela outrel;
947216bf 3114 bfd_byte *loc;
70256ad8 3115
51e0a107
JH		 3116 /* We need to generate a R_X86_64_RELATIVE reloc
3117 for the dynamic linker. */
947216bf
AM		 3118 s = htab->srelgot;
3119 if (s == NULL)
c434dee6 3120 abort ();
51e0a107 3121
7b81dfbb
AJ		 3122 outrel.r_offset = (base_got->output_section->vma
3123 + base_got->output_offset
51e0a107
JH		 3124 + off);
3125 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3126 outrel.r_addend = relocation;
947216bf
AM		 3127 loc = s->contents;
3128 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
c434dee6 3129 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
51e0a107
JH		 3130 }
3131
3132 local_got_offsets[r_symndx] |= 1;
3133 }
51e0a107 3134 }
6a2bda3f 3135
c434dee6
AJ		 3136 if (off >= (bfd_vma) -2)
3137 abort ();
3138
7b81dfbb
AJ		 3139 relocation = base_got->output_section->vma
3140 + base_got->output_offset + off;
3141 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
8c37241b
JJ		 3142 relocation -= htab->sgotplt->output_section->vma
3143 - htab->sgotplt->output_offset;
c434dee6 3144
70256ad8
AJ		 3145 break;
3146
d6ab8113
JB		 3147 case R_X86_64_GOTOFF64:
3148 /* Relocation is relative to the start of the global offset
3149 table. */
3150
3151 /* Check to make sure it isn't a protected function symbol
3152 for shared library since it may not be local when used
3153 as function address. */
3154 if (info->shared
3155 && h
3156 && h->def_regular
3157 && h->type == STT_FUNC
3158 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3159 {
3160 (*_bfd_error_handler)
3161 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3162 input_bfd, h->root.root.string);
3163 bfd_set_error (bfd_error_bad_value);
3164 return FALSE;
3165 }
3166
3167 /* Note that sgot is not involved in this
3168 calculation. We always want the start of .got.plt. If we
3169 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3170 permitted by the ABI, we might have to change this
3171 calculation. */
3172 relocation -= htab->sgotplt->output_section->vma
3173 + htab->sgotplt->output_offset;
3174 break;
3175
3176 case R_X86_64_GOTPC32:
7b81dfbb 3177 case R_X86_64_GOTPC64:
d6ab8113
JB		 3178 /* Use global offset table as symbol value. */
3179 relocation = htab->sgotplt->output_section->vma
3180 + htab->sgotplt->output_offset;
3181 unresolved_reloc = FALSE;
3182 break;
7b81dfbb
AJ		 3183
3184 case R_X86_64_PLTOFF64:
3185 /* Relocation is PLT entry relative to GOT. For local
3186 symbols it's the symbol itself relative to GOT. */
3187 if (h != NULL
3188 /* See PLT32 handling. */
3189 && h->plt.offset != (bfd_vma) -1
3190 && htab->splt != NULL)
3191 {
3192 relocation = (htab->splt->output_section->vma
3193 + htab->splt->output_offset
3194 + h->plt.offset);
3195 unresolved_reloc = FALSE;
3196 }
3197
3198 relocation -= htab->sgotplt->output_section->vma
3199 + htab->sgotplt->output_offset;
3200 break;
d6ab8113 3201
70256ad8
AJ		 3202 case R_X86_64_PLT32:
3203 /* Relocation is to the entry for this symbol in the
3204 procedure linkage table. */
3205
3206 /* Resolve a PLT32 reloc against a local symbol directly,
407443a3 3207 without using the procedure linkage table. */
70256ad8
AJ		 3208 if (h == NULL)
3209 break;
3210
c434dee6
AJ		 3211 if (h->plt.offset == (bfd_vma) -1
3212 || htab->splt == NULL)
70256ad8
AJ		 3213 {
3214 /* We didn't make a PLT entry for this symbol. This
407443a3
AJ		 3215 happens when statically linking PIC code, or when
3216 using -Bsymbolic. */
70256ad8
AJ		 3217 break;
3218 }
3219
c434dee6
AJ		 3220 relocation = (htab->splt->output_section->vma
3221 + htab->splt->output_offset
70256ad8 3222 + h->plt.offset);
b34976b6 3223 unresolved_reloc = FALSE;
70256ad8
AJ		 3224 break;
3225
fd8ab9e5
AJ		 3226 case R_X86_64_PC8:
3227 case R_X86_64_PC16:
3228 case R_X86_64_PC32:
6610a52d 3229 if (info->shared
ba3bee0b 3230 && (input_section->flags & SEC_ALLOC) != 0
90f487df 3231 && (input_section->flags & SEC_READONLY) != 0
41bed6dd 3232 && h != NULL)
6610a52d 3233 {
41bed6dd
L		 3234 bfd_boolean fail = FALSE;
3235 bfd_boolean branch
3236 = (r_type == R_X86_64_PC32
3237 && is_32bit_relative_branch (contents, rel->r_offset));
3238
3239 if (SYMBOL_REFERENCES_LOCAL (info, h))
3240 {
3241 /* Symbol is referenced locally. Make sure it is
3242 defined locally or for a branch. */
3243 fail = !h->def_regular && !branch;
3244 }
90f487df 3245 else
41bed6dd
L		 3246 {
3247 /* Symbol isn't referenced locally. We only allow
3248 branch to symbol with non-default visibility. */
3249 fail = (!branch
3250 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3251 }
3252
3253 if (fail)
3254 {
3255 const char *fmt;
3256 const char *v;
3257 const char *pic = "";
3258
3259 switch (ELF_ST_VISIBILITY (h->other))
3260 {
3261 case STV_HIDDEN:
3262 v = _("hidden symbol");
3263 break;
3264 case STV_INTERNAL:
3265 v = _("internal symbol");
3266 break;
3267 case STV_PROTECTED:
3268 v = _("protected symbol");
3269 break;
3270 default:
3271 v = _("symbol");
3272 pic = _("; recompile with -fPIC");
3273 break;
3274 }
3275
3276 if (h->def_regular)
3277 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3278 else
3279 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3280
3281 (*_bfd_error_handler) (fmt, input_bfd,
3282 x86_64_elf_howto_table[r_type].name,
3283 v, h->root.root.string, pic);
3284 bfd_set_error (bfd_error_bad_value);
3285 return FALSE;
3286 }
6610a52d
L		 3287 }
3288 /* Fall through. */
3289
70256ad8
AJ		 3290 case R_X86_64_8:
3291 case R_X86_64_16:
3292 case R_X86_64_32:
d6ab8113 3293 case R_X86_64_PC64:
6b3db546 3294 case R_X86_64_64:
80643fbc 3295 /* FIXME: The ABI says the linker should make sure the value is
407443a3 3296 the same when it's zeroextended to 64 bit. */
c434dee6 3297
b1e24c02 3298 if ((input_section->flags & SEC_ALLOC) == 0)
c434dee6
AJ		 3299 break;
3300
3301 if ((info->shared
4bc6e03a
AJ		 3302 && (h == NULL
3303 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3304 || h->root.type != bfd_link_hash_undefweak)
d8045f23
NC		 3305 && (! IS_X86_64_PCREL_TYPE (r_type)
3306 || ! SYMBOL_CALLS_LOCAL (info, h)))
d40d037c
AJ		 3307 || (ELIMINATE_COPY_RELOCS
3308 && !info->shared
c434dee6
AJ		 3309 && h != NULL
3310 && h->dynindx != -1
f5385ebf
AM		 3311 && !h->non_got_ref
3312 && ((h->def_dynamic
3313 && !h->def_regular)
c434dee6 3314 || h->root.type == bfd_link_hash_undefweak
0f88be7a 3315 || h->root.type == bfd_link_hash_undefined)))
70256ad8
AJ		 3316 {
3317 Elf_Internal_Rela outrel;
947216bf 3318 bfd_byte *loc;
b34976b6 3319 bfd_boolean skip, relocate;
c434dee6 3320 asection *sreloc;
70256ad8
AJ		 3321
3322 /* When generating a shared object, these relocations
3323 are copied into the output file to be resolved at run
407443a3 3324 time. */
b34976b6
AM		 3325 skip = FALSE;
3326 relocate = FALSE;
70256ad8 3327
c629eae0
JJ		 3328 outrel.r_offset =
3329 _bfd_elf_section_offset (output_bfd, info, input_section,
c434dee6 3330 rel->r_offset);
c629eae0 3331 if (outrel.r_offset == (bfd_vma) -1)
b34976b6 3332 skip = TRUE;
0fb19cbc 3333 else if (outrel.r_offset == (bfd_vma) -2)
b34976b6 3334 skip = TRUE, relocate = TRUE;
70256ad8
AJ		 3335
3336 outrel.r_offset += (input_section->output_section->vma
3337 + input_section->output_offset);
3338
3339 if (skip)
0bb2d96a 3340 memset (&outrel, 0, sizeof outrel);
c434dee6 3341
fd8ab9e5
AJ		 3342 /* h->dynindx may be -1 if this symbol was marked to
3343 become local. */
3344 else if (h != NULL
c434dee6 3345 && h->dynindx != -1
d8045f23
NC		 3346 && (IS_X86_64_PCREL_TYPE (r_type)
3347 || ! info->shared
3348 || ! SYMBOLIC_BIND (info, h)
3349 || ! h->def_regular))
70256ad8 3350 {
70256ad8 3351 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
c434dee6 3352 outrel.r_addend = rel->r_addend;
70256ad8
AJ		 3353 }
3354 else
3355 {
c434dee6 3356 /* This symbol is local, or marked to become local. */
607c0e09
AS		 3357 if (r_type == R_X86_64_64)
3358 {
b34976b6 3359 relocate = TRUE;
607c0e09
AS		 3360 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3361 outrel.r_addend = relocation + rel->r_addend;
3362 }
3363 else
3364 {
3365 long sindx;
3366
8517fae7 3367 if (bfd_is_abs_section (sec))
607c0e09
AS		 3368 sindx = 0;
3369 else if (sec == NULL || sec->owner == NULL)
3370 {
3371 bfd_set_error (bfd_error_bad_value);
b34976b6 3372 return FALSE;
607c0e09
AS		 3373 }
3374 else
3375 {
3376 asection *osec;
3377
74541ad4
AM		 3378 /* We are turning this relocation into one
3379 against a section symbol. It would be
3380 proper to subtract the symbol's value,
3381 osec->vma, from the emitted reloc addend,
3382 but ld.so expects buggy relocs. */
607c0e09
AS		 3383 osec = sec->output_section;
3384 sindx = elf_section_data (osec)->dynindx;
74541ad4
AM		 3385 if (sindx == 0)
3386 {
3387 asection *oi = htab->elf.text_index_section;
3388 sindx = elf_section_data (oi)->dynindx;
3389 }
3390 BFD_ASSERT (sindx != 0);
607c0e09
AS		 3391 }
3392
3393 outrel.r_info = ELF64_R_INFO (sindx, r_type);
3394 outrel.r_addend = relocation + rel->r_addend;
3395 }
70256ad8
AJ		 3396 }
3397
cbe950e9 3398 sreloc = elf_section_data (input_section)->sreloc;
d8045f23 3399
e7c33416 3400 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
c434dee6 3401
947216bf
AM		 3402 loc = sreloc->contents;
3403 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
c434dee6 3404 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
70256ad8
AJ		 3405
3406 /* If this reloc is against an external symbol, we do
3407 not want to fiddle with the addend. Otherwise, we
3408 need to include the symbol value so that it becomes
3409 an addend for the dynamic reloc. */
0f88be7a 3410 if (! relocate)
70256ad8
AJ		 3411 continue;
3412 }
3413
3414 break;
3415
bffbf940 3416 case R_X86_64_TLSGD:
67a4f2b7
AO		 3417 case R_X86_64_GOTPC32_TLSDESC:
3418 case R_X86_64_TLSDESC_CALL:
bffbf940 3419 case R_X86_64_GOTTPOFF:
bffbf940
JJ		 3420 tls_type = GOT_UNKNOWN;
3421 if (h == NULL && local_got_offsets)
3422 tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3423 else if (h != NULL)
142411ca
L		 3424 tls_type = elf64_x86_64_hash_entry (h)->tls_type;
3425
3426 if (! elf64_x86_64_tls_transition (info, input_bfd,
3427 input_section, contents,
3428 symtab_hdr, sym_hashes,
3429 &r_type, tls_type, rel,
3430 relend, h))
534a31f6 3431 return FALSE;
bffbf940
JJ		 3432
3433 if (r_type == R_X86_64_TPOFF32)
3434 {
142411ca
L		 3435 bfd_vma roff = rel->r_offset;
3436
bffbf940 3437 BFD_ASSERT (! unresolved_reloc);
142411ca 3438
bffbf940
JJ		 3439 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3440 {
bffbf940 3441 /* GD->LE transition.
abcf1d52 3442 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
a3fadc9a 3443 .word 0x6666; rex64; call __tls_get_addr
bffbf940
JJ		 3444 Change it into:
3445 movq %fs:0, %rax
3446 leaq foo@tpoff(%rax), %rax */
142411ca 3447 memcpy (contents + roff - 4,
bffbf940
JJ		 3448 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3449 16);
eb4ff4d6
L		 3450 bfd_put_32 (output_bfd,
3451 elf64_x86_64_tpoff (info, relocation),
142411ca 3452 contents + roff + 8);
a3fadc9a 3453 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
bffbf940
JJ		 3454 rel++;
3455 continue;
3456 }
67a4f2b7
AO		 3457 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3458 {
3459 /* GDesc -> LE transition.
3460 It's originally something like:
3461 leaq x@tlsdesc(%rip), %rax
3462
3463 Change it to:
3464 movl $x@tpoff, %rax
142411ca 3465 */
67a4f2b7
AO		 3466
3467 unsigned int val, type, type2;
67a4f2b7 3468
67a4f2b7 3469 type = bfd_get_8 (input_bfd, contents + roff - 3);
67a4f2b7 3470 type2 = bfd_get_8 (input_bfd, contents + roff - 2);
67a4f2b7 3471 val = bfd_get_8 (input_bfd, contents + roff - 1);
67a4f2b7
AO		 3472 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3473 contents + roff - 3);
3474 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3475 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3476 contents + roff - 1);
eb4ff4d6
L		 3477 bfd_put_32 (output_bfd,
3478 elf64_x86_64_tpoff (info, relocation),
67a4f2b7
AO		 3479 contents + roff);
3480 continue;
3481 }
3482 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3483 {
3484 /* GDesc -> LE transition.
3485 It's originally:
3486 call *(%rax)
3487 Turn it into:
142411ca 3488 xchg %ax,%ax. */
10efb593 3489 bfd_put_8 (output_bfd, 0x66, contents + roff);
67a4f2b7
AO		 3490 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3491 continue;
3492 }
142411ca 3493 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
bffbf940 3494 {
bffbf940
JJ		 3495 /* IE->LE transition:
3496 Originally it can be one of:
3497 movq foo@gottpoff(%rip), %reg
3498 addq foo@gottpoff(%rip), %reg
3499 We change it into:
3500 movq $foo, %reg
3501 leaq foo(%reg), %reg
3502 addq $foo, %reg. */
142411ca
L		 3503
3504 unsigned int val, type, reg;
3505
3506 val = bfd_get_8 (input_bfd, contents + roff - 3);
3507 type = bfd_get_8 (input_bfd, contents + roff - 2);
3508 reg = bfd_get_8 (input_bfd, contents + roff - 1);
bffbf940 3509 reg >>= 3;
bffbf940
JJ		 3510 if (type == 0x8b)
3511 {
3512 /* movq */
3513 if (val == 0x4c)
3514 bfd_put_8 (output_bfd, 0x49,
142411ca 3515 contents + roff - 3);
bffbf940 3516 bfd_put_8 (output_bfd, 0xc7,
142411ca 3517 contents + roff - 2);
bffbf940 3518 bfd_put_8 (output_bfd, 0xc0 | reg,
142411ca 3519 contents + roff - 1);
bffbf940
JJ		 3520 }
3521 else if (reg == 4)
3522 {
3523 /* addq -> addq - addressing with %rsp/%r12 is
3524 special */
3525 if (val == 0x4c)
3526 bfd_put_8 (output_bfd, 0x49,
142411ca 3527 contents + roff - 3);
bffbf940 3528 bfd_put_8 (output_bfd, 0x81,
142411ca 3529 contents + roff - 2);
bffbf940 3530 bfd_put_8 (output_bfd, 0xc0 | reg,
142411ca 3531 contents + roff - 1);
bffbf940
JJ		 3532 }
3533 else
3534 {
3535 /* addq -> leaq */
3536 if (val == 0x4c)
3537 bfd_put_8 (output_bfd, 0x4d,
142411ca 3538 contents + roff - 3);
bffbf940 3539 bfd_put_8 (output_bfd, 0x8d,
142411ca 3540 contents + roff - 2);
bffbf940 3541 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
142411ca 3542 contents + roff - 1);
bffbf940 3543 }
eb4ff4d6
L		 3544 bfd_put_32 (output_bfd,
3545 elf64_x86_64_tpoff (info, relocation),
142411ca 3546 contents + roff);
bffbf940
JJ		 3547 continue;
3548 }
142411ca
L		 3549 else
3550 BFD_ASSERT (FALSE);
bffbf940
JJ		 3551 }
3552
3553 if (htab->sgot == NULL)
3554 abort ();
3555
3556 if (h != NULL)
67a4f2b7
AO		 3557 {
3558 off = h->got.offset;
3559 offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got;
3560 }
bffbf940
JJ		 3561 else
3562 {
3563 if (local_got_offsets == NULL)
3564 abort ();
3565
3566 off = local_got_offsets[r_symndx];
67a4f2b7 3567 offplt = local_tlsdesc_gotents[r_symndx];
bffbf940
JJ		 3568 }
3569
3570 if ((off & 1) != 0)
3571 off &= ~1;
26e41594 3572 else
bffbf940
JJ		 3573 {
3574 Elf_Internal_Rela outrel;
947216bf 3575 bfd_byte *loc;
bffbf940 3576 int dr_type, indx;
67a4f2b7 3577 asection *sreloc;
bffbf940
JJ		 3578
3579 if (htab->srelgot == NULL)
3580 abort ();
3581
67a4f2b7
AO		 3582 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3583
3584 if (GOT_TLS_GDESC_P (tls_type))
3585 {
3586 outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC);
3587 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
3588 + 2 * GOT_ENTRY_SIZE <= htab->sgotplt->size);
3589 outrel.r_offset = (htab->sgotplt->output_section->vma
3590 + htab->sgotplt->output_offset
3591 + offplt
3592 + htab->sgotplt_jump_table_size);
3593 sreloc = htab->srelplt;
3594 loc = sreloc->contents;
3595 loc += sreloc->reloc_count++
3596 * sizeof (Elf64_External_Rela);
3597 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3598 <= sreloc->contents + sreloc->size);
3599 if (indx == 0)
eb4ff4d6 3600 outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
67a4f2b7
AO		 3601 else
3602 outrel.r_addend = 0;
3603 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3604 }
3605
3606 sreloc = htab->srelgot;
3607
bffbf940
JJ		 3608 outrel.r_offset = (htab->sgot->output_section->vma
3609 + htab->sgot->output_offset + off);
3610
67a4f2b7 3611 if (GOT_TLS_GD_P (tls_type))
bffbf940 3612 dr_type = R_X86_64_DTPMOD64;
67a4f2b7
AO		 3613 else if (GOT_TLS_GDESC_P (tls_type))
3614 goto dr_done;
bffbf940
JJ		 3615 else
3616 dr_type = R_X86_64_TPOFF64;
3617
3618 bfd_put_64 (output_bfd, 0, htab->sgot->contents + off);
3619 outrel.r_addend = 0;
67a4f2b7
AO		 3620 if ((dr_type == R_X86_64_TPOFF64
3621 || dr_type == R_X86_64_TLSDESC) && indx == 0)
eb4ff4d6 3622 outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
bffbf940
JJ		 3623 outrel.r_info = ELF64_R_INFO (indx, dr_type);
3624
67a4f2b7
AO		 3625 loc = sreloc->contents;
3626 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
3627 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3628 <= sreloc->contents + sreloc->size);
bffbf940
JJ		 3629 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3630
67a4f2b7 3631 if (GOT_TLS_GD_P (tls_type))
bffbf940
JJ		 3632 {
3633 if (indx == 0)
3634 {
d40d037c 3635 BFD_ASSERT (! unresolved_reloc);
bffbf940 3636 bfd_put_64 (output_bfd,
eb4ff4d6 3637 relocation - elf64_x86_64_dtpoff_base (info),
bffbf940
JJ		 3638 htab->sgot->contents + off + GOT_ENTRY_SIZE);
3639 }
3640 else
3641 {
3642 bfd_put_64 (output_bfd, 0,
3643 htab->sgot->contents + off + GOT_ENTRY_SIZE);
3644 outrel.r_info = ELF64_R_INFO (indx,
3645 R_X86_64_DTPOFF64);
3646 outrel.r_offset += GOT_ENTRY_SIZE;
67a4f2b7 3647 sreloc->reloc_count++;
947216bf 3648 loc += sizeof (Elf64_External_Rela);
67a4f2b7
AO		 3649 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
3650 <= sreloc->contents + sreloc->size);
947216bf 3651 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
bffbf940
JJ		 3652 }
3653 }
3654
67a4f2b7 3655 dr_done:
bffbf940
JJ		 3656 if (h != NULL)
3657 h->got.offset |= 1;
3658 else
3659 local_got_offsets[r_symndx] |= 1;
3660 }
3661
67a4f2b7
AO		 3662 if (off >= (bfd_vma) -2
3663 && ! GOT_TLS_GDESC_P (tls_type))
bffbf940
JJ		 3664 abort ();
3665 if (r_type == ELF64_R_TYPE (rel->r_info))
3666 {
67a4f2b7
AO		 3667 if (r_type == R_X86_64_GOTPC32_TLSDESC
3668 || r_type == R_X86_64_TLSDESC_CALL)
3669 relocation = htab->sgotplt->output_section->vma
3670 + htab->sgotplt->output_offset
3671 + offplt + htab->sgotplt_jump_table_size;
3672 else
3673 relocation = htab->sgot->output_section->vma
3674 + htab->sgot->output_offset + off;
b34976b6 3675 unresolved_reloc = FALSE;
bffbf940 3676 }
142411ca 3677 else
67a4f2b7 3678 {
142411ca 3679 bfd_vma roff = rel->r_offset;
67a4f2b7 3680
142411ca
L		 3681 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3682 {
3683 /* GD->IE transition.
3684 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3685 .word 0x6666; rex64; call __tls_get_addr@plt
3686 Change it into:
3687 movq %fs:0, %rax
3688 addq foo@gottpoff(%rip), %rax */
3689 memcpy (contents + roff - 4,
3690 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3691 16);
3692
3693 relocation = (htab->sgot->output_section->vma
3694 + htab->sgot->output_offset + off
3695 - roff
3696 - input_section->output_section->vma
3697 - input_section->output_offset
3698 - 12);
3699 bfd_put_32 (output_bfd, relocation,
3700 contents + roff + 8);
3701 /* Skip R_X86_64_PLT32. */
3702 rel++;
3703 continue;
3704 }
3705 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3706 {
3707 /* GDesc -> IE transition.
3708 It's originally something like:
3709 leaq x@tlsdesc(%rip), %rax
67a4f2b7 3710
142411ca
L		 3711 Change it to:
3712 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax
3713 */
67a4f2b7 3714
142411ca 3715 unsigned int val, type, type2;
67a4f2b7 3716
142411ca
L		 3717 type = bfd_get_8 (input_bfd, contents + roff - 3);
3718 type2 = bfd_get_8 (input_bfd, contents + roff - 2);
3719 val = bfd_get_8 (input_bfd, contents + roff - 1);
67a4f2b7 3720
142411ca
L		 3721 /* Now modify the instruction as appropriate. To
3722 turn a leaq into a movq in the form we use it, it
3723 suffices to change the second byte from 0x8d to
3724 0x8b. */
3725 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3726
3727 bfd_put_32 (output_bfd,
3728 htab->sgot->output_section->vma
3729 + htab->sgot->output_offset + off
3730 - rel->r_offset
3731 - input_section->output_section->vma
3732 - input_section->output_offset
3733 - 4,
3734 contents + roff);
3735 continue;
3736 }
3737 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3738 {
3739 /* GDesc -> IE transition.
3740 It's originally:
3741 call *(%rax)
3742
3743 Change it to:
3744 xchg %ax,%ax. */
3745
3746 unsigned int val, type;
3747
3748 type = bfd_get_8 (input_bfd, contents + roff);
3749 val = bfd_get_8 (input_bfd, contents + roff + 1);
3750 bfd_put_8 (output_bfd, 0x66, contents + roff);
3751 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3752 continue;
3753 }
3754 else
3755 BFD_ASSERT (FALSE);
67a4f2b7 3756 }
bffbf940
JJ		 3757 break;
3758
3759 case R_X86_64_TLSLD:
142411ca
L		 3760 if (! elf64_x86_64_tls_transition (info, input_bfd,
3761 input_section, contents,
3762 symtab_hdr, sym_hashes,
3763 &r_type, GOT_UNKNOWN,
3764 rel, relend, h))
3765 return FALSE;
a3fadc9a 3766
142411ca
L		 3767 if (r_type != R_X86_64_TLSLD)
3768 {
bffbf940 3769 /* LD->LE transition:
a3fadc9a 3770 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
bffbf940
JJ		 3771 We change it into:
3772 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
142411ca
L		 3773
3774 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
bffbf940
JJ		 3775 memcpy (contents + rel->r_offset - 3,
3776 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
a3fadc9a 3777 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
bffbf940
JJ		 3778 rel++;
3779 continue;
3780 }
3781
3782 if (htab->sgot == NULL)
3783 abort ();
3784
3785 off = htab->tls_ld_got.offset;
3786 if (off & 1)
3787 off &= ~1;
3788 else
3789 {
3790 Elf_Internal_Rela outrel;
947216bf 3791 bfd_byte *loc;
bffbf940
JJ		 3792
3793 if (htab->srelgot == NULL)
3794 abort ();
3795
3796 outrel.r_offset = (htab->sgot->output_section->vma
3797 + htab->sgot->output_offset + off);
3798
3799 bfd_put_64 (output_bfd, 0,
3800 htab->sgot->contents + off);
3801 bfd_put_64 (output_bfd, 0,
3802 htab->sgot->contents + off + GOT_ENTRY_SIZE);
3803 outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64);
3804 outrel.r_addend = 0;
947216bf
AM		 3805 loc = htab->srelgot->contents;
3806 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
bffbf940
JJ		 3807 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
3808 htab->tls_ld_got.offset |= 1;
3809 }
3810 relocation = htab->sgot->output_section->vma
3811 + htab->sgot->output_offset + off;
b34976b6 3812 unresolved_reloc = FALSE;
bffbf940
JJ		 3813 break;
3814
3815 case R_X86_64_DTPOFF32:
a45bb67d 3816 if (info->shared || (input_section->flags & SEC_CODE) == 0)
eb4ff4d6 3817 relocation -= elf64_x86_64_dtpoff_base (info);
bffbf940 3818 else
eb4ff4d6 3819 relocation = elf64_x86_64_tpoff (info, relocation);
bffbf940
JJ		 3820 break;
3821
3822 case R_X86_64_TPOFF32:
3823 BFD_ASSERT (! info->shared);
eb4ff4d6 3824 relocation = elf64_x86_64_tpoff (info, relocation);
bffbf940
JJ		 3825 break;
3826
70256ad8
AJ		 3827 default:
3828 break;
3829 }
8d88c4ca 3830
239e1f3a
AM		 3831 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3832 because such sections are not SEC_ALLOC and thus ld.so will
3833 not process them. */
c434dee6 3834 if (unresolved_reloc
239e1f3a 3835 && !((input_section->flags & SEC_DEBUGGING) != 0
f5385ebf 3836 && h->def_dynamic))
c434dee6 3837 (*_bfd_error_handler)
843fe662 3838 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
d003868e
AM		 3839 input_bfd,
3840 input_section,
c434dee6 3841 (long) rel->r_offset,
843fe662 3842 howto->name,
c434dee6
AJ		 3843 h->root.root.string);
3844
cbe950e9 3845do_relocation:
8d88c4ca 3846 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
c434dee6
AJ		 3847 contents, rel->r_offset,
3848 relocation, rel->r_addend);
8d88c4ca
NC		 3849
3850 if (r != bfd_reloc_ok)
8da6118f 3851 {
c434dee6
AJ		 3852 const char *name;
3853
3854 if (h != NULL)
3855 name = h->root.root.string;
3856 else
8da6118f 3857 {
c434dee6
AJ		 3858 name = bfd_elf_string_from_elf_section (input_bfd,
3859 symtab_hdr->sh_link,
3860 sym->st_name);
3861 if (name == NULL)
b34976b6 3862 return FALSE;
c434dee6
AJ		 3863 if (*name == '\0')
3864 name = bfd_section_name (input_bfd, sec);
3865 }
3866
3867 if (r == bfd_reloc_overflow)
3868 {
c434dee6 3869 if (! ((*info->callbacks->reloc_overflow)
dfeffb9f
L		 3870 (info, (h ? &h->root : NULL), name, howto->name,
3871 (bfd_vma) 0, input_bfd, input_section,
3872 rel->r_offset)))
b34976b6 3873 return FALSE;
c434dee6
AJ		 3874 }
3875 else
3876 {
3877 (*_bfd_error_handler)
d003868e
AM		 3878 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3879 input_bfd, input_section,
c434dee6 3880 (long) rel->r_offset, name, (int) r);
b34976b6 3881 return FALSE;
8da6118f
KH		 3882 }
3883 }
8d88c4ca 3884 }
70256ad8 3885
b34976b6 3886 return TRUE;
70256ad8
AJ		 3887}
3888
3889/* Finish up dynamic symbol handling. We set the contents of various
3890 dynamic sections here. */
3891
b34976b6 3892static bfd_boolean
27482721
AJ		 3893elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd,
3894 struct bfd_link_info *info,
3895 struct elf_link_hash_entry *h,
3896 Elf_Internal_Sym *sym)
70256ad8 3897{
c434dee6 3898 struct elf64_x86_64_link_hash_table *htab;
70256ad8 3899
c434dee6 3900 htab = elf64_x86_64_hash_table (info);
70256ad8
AJ		 3901
3902 if (h->plt.offset != (bfd_vma) -1)
3903 {
70256ad8
AJ		 3904 bfd_vma plt_index;
3905 bfd_vma got_offset;
3906 Elf_Internal_Rela rela;
947216bf 3907 bfd_byte *loc;
cbe950e9
L		 3908 asection *plt, *gotplt, *relplt;
3909
3910 /* When building a static executable, use .iplt, .igot.plt and
3911 .rela.iplt sections for STT_GNU_IFUNC symbols. */
710ab287 3912 if (htab->splt != NULL)
cbe950e9
L		 3913 {
3914 plt = htab->splt;
3915 gotplt = htab->sgotplt;
3916 relplt = htab->srelplt;
3917 }
3918 else
3919 {
3920 plt = htab->iplt;
3921 gotplt = htab->igotplt;
3922 relplt = htab->irelplt;
3923 }
70256ad8
AJ		 3924
3925 /* This symbol has an entry in the procedure linkage table. Set
407443a3 3926 it up. */
cbe950e9
L		 3927 if ((h->dynindx == -1
3928 && !((h->forced_local || info->executable)
3929 && h->def_regular
3930 && h->type == STT_GNU_IFUNC))
3931 || plt == NULL
3932 || gotplt == NULL
3933 || relplt == NULL)
c434dee6 3934 abort ();
70256ad8
AJ		 3935
3936 /* Get the index in the procedure linkage table which
3937 corresponds to this symbol. This is the index of this symbol
3938 in all the symbols for which we are making plt entries. The
cbe950e9
L		 3939 first entry in the procedure linkage table is reserved.
3940
3941 Get the offset into the .got table of the entry that
407443a3 3942 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
cbe950e9
L		 3943 bytes. The first three are reserved for the dynamic linker.
3944
3945 For static executables, we don't reserve anything. */
3946
3947 if (plt == htab->splt)
3948 {
3949 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3950 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3951 }
3952 else
3953 {
3954 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3955 got_offset = plt_index * GOT_ENTRY_SIZE;
3956 }
70256ad8
AJ		 3957
3958 /* Fill in the entry in the procedure linkage table. */
cbe950e9 3959 memcpy (plt->contents + h->plt.offset, elf64_x86_64_plt_entry,
70256ad8
AJ		 3960 PLT_ENTRY_SIZE);
3961
3962 /* Insert the relocation positions of the plt section. The magic
3963 numbers at the end of the statements are the positions of the
3964 relocations in the plt section. */
653165cc
AJ		 3965 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3966 instruction uses 6 bytes, subtract this value. */
3967 bfd_put_32 (output_bfd,
cbe950e9
L		 3968 (gotplt->output_section->vma
3969 + gotplt->output_offset
653165cc 3970 + got_offset
cbe950e9
L		 3971 - plt->output_section->vma
3972 - plt->output_offset
653165cc
AJ		 3973 - h->plt.offset
3974 - 6),
cbe950e9
L		 3975 plt->contents + h->plt.offset + 2);
3976
3977 /* Don't fill PLT entry for static executables. */
3978 if (plt == htab->splt)
3979 {
3980 /* Put relocation index. */
3981 bfd_put_32 (output_bfd, plt_index,
3982 plt->contents + h->plt.offset + 7);
3983 /* Put offset for jmp .PLT0. */
3984 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3985 plt->contents + h->plt.offset + 12);
3986 }
70256ad8 3987
653165cc
AJ		 3988 /* Fill in the entry in the global offset table, initially this
3989 points to the pushq instruction in the PLT which is at offset 6. */
cbe950e9
L		 3990 bfd_put_64 (output_bfd, (plt->output_section->vma
3991 + plt->output_offset
70256ad8 3992 + h->plt.offset + 6),
cbe950e9 3993 gotplt->contents + got_offset);
70256ad8
AJ		 3994
3995 /* Fill in the entry in the .rela.plt section. */
cbe950e9
L		 3996 rela.r_offset = (gotplt->output_section->vma
3997 + gotplt->output_offset
70256ad8 3998 + got_offset);
cbe950e9
L		 3999 if (h->dynindx == -1
4000 || ((info->executable
4001 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4002 && h->def_regular
4003 && h->type == STT_GNU_IFUNC))
4004 {
4005 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4006 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4007 rela.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
4008 rela.r_addend = (h->root.u.def.value
4009 + h->root.u.def.section->output_section->vma
4010 + h->root.u.def.section->output_offset);
4011 }
4012 else
4013 {
4014 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
4015 rela.r_addend = 0;
4016 }
4017 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
c434dee6 4018 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
70256ad8 4019
f5385ebf 4020 if (!h->def_regular)
70256ad8
AJ		 4021 {
4022 /* Mark the symbol as undefined, rather than as defined in
47a9f7b3
JJ		 4023 the .plt section. Leave the value if there were any
4024 relocations where pointer equality matters (this is a clue
c434dee6
AJ		 4025 for the dynamic linker, to make function pointer
4026 comparisons work between an application and shared
47a9f7b3
JJ		 4027 library), otherwise set it to zero. If a function is only
4028 called from a binary, there is no need to slow down
4029 shared libraries because of that. */
70256ad8 4030 sym->st_shndx = SHN_UNDEF;
f5385ebf 4031 if (!h->pointer_equality_needed)
47a9f7b3 4032 sym->st_value = 0;
70256ad8
AJ		 4033 }
4034 }
4035
bffbf940 4036 if (h->got.offset != (bfd_vma) -1
67a4f2b7 4037 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type)
bffbf940 4038 && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
053579d7 4039 {
053579d7 4040 Elf_Internal_Rela rela;
947216bf 4041 bfd_byte *loc;
053579d7
AJ		 4042
4043 /* This symbol has an entry in the global offset table. Set it
bffbf940 4044 up. */
c434dee6
AJ		 4045 if (htab->sgot == NULL || htab->srelgot == NULL)
4046 abort ();
053579d7 4047
c434dee6
AJ		 4048 rela.r_offset = (htab->sgot->output_section->vma
4049 + htab->sgot->output_offset
dc810e39 4050 + (h->got.offset &~ (bfd_vma) 1));
053579d7
AJ		 4051
4052 /* If this is a static link, or it is a -Bsymbolic link and the
4053 symbol is defined locally or was forced to be local because
4054 of a version file, we just want to emit a RELATIVE reloc.
4055 The entry in the global offset table will already have been
4056 initialized in the relocate_section function. */
710ab287 4057 if (h->def_regular
0018b0a3
L		 4058 && h->type == STT_GNU_IFUNC)
4059 {
710ab287
L		 4060 if (info->shared)
4061 {
4062 /* Generate R_X86_64_GLOB_DAT. */
4063 goto do_glob_dat;
4064 }
4065 else
4066 {
4067 if (!h->pointer_equality_needed)
4068 abort ();
4069
4070 /* For non-shared object, we can't use .got.plt, which
4071 contains the real function addres if we need pointer
4072 equality. We load the GOT entry with the PLT entry. */
4073 asection *plt = htab->splt ? htab->splt : htab->iplt;
4074 bfd_put_64 (output_bfd, (plt->output_section->vma
4075 + plt->output_offset
4076 + h->plt.offset),
4077 htab->sgot->contents + h->got.offset);
4078 return TRUE;
4079 }
0018b0a3
L		 4080 }
4081 else if (info->shared
4082 && SYMBOL_REFERENCES_LOCAL (info, h))
053579d7 4083 {
41bed6dd
L		 4084 if (!h->def_regular)
4085 return FALSE;
cc78d0af 4086 BFD_ASSERT((h->got.offset & 1) != 0);
053579d7
AJ		 4087 rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
4088 rela.r_addend = (h->root.u.def.value
4089 + h->root.u.def.section->output_section->vma
4090 + h->root.u.def.section->output_offset);
4091 }
4092 else
4093 {
4094 BFD_ASSERT((h->got.offset & 1) == 0);
710ab287 4095do_glob_dat:
c434dee6
AJ		 4096 bfd_put_64 (output_bfd, (bfd_vma) 0,
4097 htab->sgot->contents + h->got.offset);
053579d7
AJ		 4098 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT);
4099 rela.r_addend = 0;
4100 }
4101
947216bf
AM		 4102 loc = htab->srelgot->contents;
4103 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
c434dee6 4104 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
053579d7
AJ		 4105 }
4106
f5385ebf 4107 if (h->needs_copy)
70256ad8 4108 {
70256ad8 4109 Elf_Internal_Rela rela;
947216bf 4110 bfd_byte *loc;
70256ad8
AJ		 4111
4112 /* This symbol needs a copy reloc. Set it up. */
4113
c434dee6
AJ		 4114 if (h->dynindx == -1
4115 || (h->root.type != bfd_link_hash_defined
4116 && h->root.type != bfd_link_hash_defweak)
4117 || htab->srelbss == NULL)
4118 abort ();
70256ad8
AJ		 4119
4120 rela.r_offset = (h->root.u.def.value
4121 + h->root.u.def.section->output_section->vma
4122 + h->root.u.def.section->output_offset);
4123 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
4124 rela.r_addend = 0;
947216bf
AM		 4125 loc = htab->srelbss->contents;
4126 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
c434dee6 4127 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
70256ad8
AJ		 4128 }
4129
c25bc9fc
L		 4130 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4131 be NULL for local symbols. */
4132 if (sym != NULL
4133 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
4134 || h == htab->elf.hgot))
70256ad8
AJ		 4135 sym->st_shndx = SHN_ABS;
4136
b34976b6 4137 return TRUE;
70256ad8
AJ		 4138}
4139
c25bc9fc
L		 4140/* Finish up local dynamic symbol handling. We set the contents of
4141 various dynamic sections here. */
4142
4143static bfd_boolean
4144elf64_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
4145{
4146 struct elf_link_hash_entry *h
4147 = (struct elf_link_hash_entry *) *slot;
4148 struct bfd_link_info *info
4149 = (struct bfd_link_info *) inf;
4150
4151 return elf64_x86_64_finish_dynamic_symbol (info->output_bfd,
4152 info, h, NULL);
4153}
4154
c434dee6
AJ		 4155/* Used to decide how to sort relocs in an optimal manner for the
4156 dynamic linker, before writing them out. */
4157
4158static enum elf_reloc_type_class
27482721 4159elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
c434dee6
AJ		 4160{
4161 switch ((int) ELF64_R_TYPE (rela->r_info))
4162 {
4163 case R_X86_64_RELATIVE:
4164 return reloc_class_relative;
4165 case R_X86_64_JUMP_SLOT:
4166 return reloc_class_plt;
4167 case R_X86_64_COPY:
4168 return reloc_class_copy;
4169 default:
4170 return reloc_class_normal;
4171 }
4172}
4173
70256ad8
AJ		 4174/* Finish up the dynamic sections. */
4175
b34976b6 4176static bfd_boolean
27482721 4177elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
70256ad8 4178{
c434dee6 4179 struct elf64_x86_64_link_hash_table *htab;
70256ad8
AJ		 4180 bfd *dynobj;
4181 asection *sdyn;
70256ad8 4182
c434dee6
AJ		 4183 htab = elf64_x86_64_hash_table (info);
4184 dynobj = htab->elf.dynobj;
70256ad8
AJ		 4185 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4186
c434dee6 4187 if (htab->elf.dynamic_sections_created)
70256ad8 4188 {
70256ad8
AJ		 4189 Elf64_External_Dyn *dyncon, *dynconend;
4190
c434dee6
AJ		 4191 if (sdyn == NULL || htab->sgot == NULL)
4192 abort ();
70256ad8
AJ		 4193
4194 dyncon = (Elf64_External_Dyn *) sdyn->contents;
eea6121a 4195 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
70256ad8
AJ		 4196 for (; dyncon < dynconend; dyncon++)
4197 {
4198 Elf_Internal_Dyn dyn;
70256ad8
AJ		 4199 asection *s;
4200
4201 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
4202
4203 switch (dyn.d_tag)
4204 {
4205 default:
053579d7 4206 continue;
70256ad8
AJ		 4207
4208 case DT_PLTGOT:
8c37241b
JJ		 4209 s = htab->sgotplt;
4210 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
c434dee6 4211 break;
70256ad8
AJ		 4212
4213 case DT_JMPREL:
c434dee6
AJ		 4214 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
4215 break;
70256ad8 4216
c434dee6
AJ		 4217 case DT_PLTRELSZ:
4218 s = htab->srelplt->output_section;
eea6121a 4219 dyn.d_un.d_val = s->size;
70256ad8
AJ		 4220 break;
4221
4222 case DT_RELASZ:
c434dee6
AJ		 4223 /* The procedure linkage table relocs (DT_JMPREL) should
4224 not be included in the overall relocs (DT_RELA).
4225 Therefore, we override the DT_RELASZ entry here to
4226 make it not include the JMPREL relocs. Since the
4227 linker script arranges for .rela.plt to follow all
4228 other relocation sections, we don't have to worry
4229 about changing the DT_RELA entry. */
4230 if (htab->srelplt != NULL)
70256ad8 4231 {
c434dee6 4232 s = htab->srelplt->output_section;
eea6121a 4233 dyn.d_un.d_val -= s->size;
70256ad8
AJ		 4234 }
4235 break;
67a4f2b7
AO		 4236
4237 case DT_TLSDESC_PLT:
4238 s = htab->splt;
4239 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4240 + htab->tlsdesc_plt;
4241 break;
4242
4243 case DT_TLSDESC_GOT:
4244 s = htab->sgot;
4245 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4246 + htab->tlsdesc_got;
4247 break;
70256ad8 4248 }
c434dee6 4249
70256ad8
AJ		 4250 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
4251 }
4252
c434dee6 4253 /* Fill in the special first entry in the procedure linkage table. */
eea6121a 4254 if (htab->splt && htab->splt->size > 0)
70256ad8 4255 {
653165cc 4256 /* Fill in the first entry in the procedure linkage table. */
c434dee6
AJ		 4257 memcpy (htab->splt->contents, elf64_x86_64_plt0_entry,
4258 PLT_ENTRY_SIZE);
653165cc
AJ		 4259 /* Add offset for pushq GOT+8(%rip), since the instruction
4260 uses 6 bytes subtract this value. */
4261 bfd_put_32 (output_bfd,
c434dee6
AJ		 4262 (htab->sgotplt->output_section->vma
4263 + htab->sgotplt->output_offset
653165cc 4264 + 8
c434dee6
AJ		 4265 - htab->splt->output_section->vma
4266 - htab->splt->output_offset
653165cc 4267 - 6),
c434dee6 4268 htab->splt->contents + 2);
653165cc
AJ		 4269 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4270 the end of the instruction. */
4271 bfd_put_32 (output_bfd,
c434dee6
AJ		 4272 (htab->sgotplt->output_section->vma
4273 + htab->sgotplt->output_offset
653165cc 4274 + 16
c434dee6
AJ		 4275 - htab->splt->output_section->vma
4276 - htab->splt->output_offset
653165cc 4277 - 12),
c434dee6 4278 htab->splt->contents + 8);
653165cc 4279
c434dee6
AJ		 4280 elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize =
4281 PLT_ENTRY_SIZE;
67a4f2b7
AO		 4282
4283 if (htab->tlsdesc_plt)
4284 {
4285 bfd_put_64 (output_bfd, (bfd_vma) 0,
4286 htab->sgot->contents + htab->tlsdesc_got);
4287
4288 memcpy (htab->splt->contents + htab->tlsdesc_plt,
4289 elf64_x86_64_plt0_entry,
4290 PLT_ENTRY_SIZE);
4291
4292 /* Add offset for pushq GOT+8(%rip), since the
4293 instruction uses 6 bytes subtract this value. */
4294 bfd_put_32 (output_bfd,
4295 (htab->sgotplt->output_section->vma
4296 + htab->sgotplt->output_offset
4297 + 8
4298 - htab->splt->output_section->vma
4299 - htab->splt->output_offset
4300 - htab->tlsdesc_plt
4301 - 6),
4302 htab->splt->contents + htab->tlsdesc_plt + 2);
4303 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4304 htab->tlsdesc_got. The 12 is the offset to the end of
4305 the instruction. */
4306 bfd_put_32 (output_bfd,
4307 (htab->sgot->output_section->vma
4308 + htab->sgot->output_offset
4309 + htab->tlsdesc_got
4310 - htab->splt->output_section->vma
4311 - htab->splt->output_offset
4312 - htab->tlsdesc_plt
4313 - 12),
4314 htab->splt->contents + htab->tlsdesc_plt + 8);
4315 }
70256ad8 4316 }
70256ad8
AJ		 4317 }
4318
c434dee6 4319 if (htab->sgotplt)
70256ad8 4320 {
c434dee6 4321 /* Fill in the first three entries in the global offset table. */
eea6121a 4322 if (htab->sgotplt->size > 0)
c434dee6
AJ		 4323 {
4324 /* Set the first entry in the global offset table to the address of
4325 the dynamic section. */
4326 if (sdyn == NULL)
4327 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents);
4328 else
4329 bfd_put_64 (output_bfd,
4330 sdyn->output_section->vma + sdyn->output_offset,
4331 htab->sgotplt->contents);
4332 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4333 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE);
4334 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2);
4335 }
70256ad8 4336
c434dee6
AJ		 4337 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize =
4338 GOT_ENTRY_SIZE;
4339 }
70256ad8 4340
eea6121a 4341 if (htab->sgot && htab->sgot->size > 0)
8c37241b
JJ		 4342 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize
4343 = GOT_ENTRY_SIZE;
4344
c25bc9fc
L		 4345 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4346 htab_traverse (htab->loc_hash_table,
4347 elf64_x86_64_finish_local_dynamic_symbol,
4348 info);
4349
b34976b6 4350 return TRUE;
8d88c4ca
NC		 4351}
4352
4c45e5c9
JJ		 4353/* Return address for Ith PLT stub in section PLT, for relocation REL
4354 or (bfd_vma) -1 if it should not be included. */
4355
4356static bfd_vma
4357elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4358 const arelent *rel ATTRIBUTE_UNUSED)
4359{
4360 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4361}
8df9fc9d 4362
d2b2c203
DJ		 4363/* Handle an x86-64 specific section when reading an object file. This
4364 is called when elfcode.h finds a section with an unknown type. */
4365
4366static bfd_boolean
6dc132d9
L		 4367elf64_x86_64_section_from_shdr (bfd *abfd,
4368 Elf_Internal_Shdr *hdr,
4369 const char *name,
4370 int shindex)
d2b2c203
DJ		 4371{
4372 if (hdr->sh_type != SHT_X86_64_UNWIND)
4373 return FALSE;
4374
6dc132d9 4375 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
d2b2c203
DJ		 4376 return FALSE;
4377
4378 return TRUE;
4379}
4380
3b22753a
L		 4381/* Hook called by the linker routine which adds symbols from an object
4382 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4383 of .bss. */
4384
4385static bfd_boolean
4386elf64_x86_64_add_symbol_hook (bfd *abfd,
d8045f23 4387 struct bfd_link_info *info,
3b22753a
L		 4388 Elf_Internal_Sym *sym,
4389 const char **namep ATTRIBUTE_UNUSED,
4390 flagword *flagsp ATTRIBUTE_UNUSED,
d8045f23
NC		 4391 asection **secp,
4392 bfd_vma *valp)
3b22753a
L		 4393{
4394 asection *lcomm;
4395
4396 switch (sym->st_shndx)
4397 {
4398 case SHN_X86_64_LCOMMON:
4399 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4400 if (lcomm == NULL)
4401 {
4402 lcomm = bfd_make_section_with_flags (abfd,
4403 "LARGE_COMMON",
4404 (SEC_ALLOC
4405 | SEC_IS_COMMON
4406 | SEC_LINKER_CREATED));
4407 if (lcomm == NULL)
4408 return FALSE;
4409 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4410 }
4411 *secp = lcomm;
4412 *valp = sym->st_size;
4413 break;
4414 }
d8045f23
NC		 4415
4416 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4417 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4418
3b22753a
L		 4419 return TRUE;
4420}
4421
4422
4423/* Given a BFD section, try to locate the corresponding ELF section
4424 index. */
4425
4426static bfd_boolean
4427elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4428 asection *sec, int *index)
4429{
4430 if (sec == &_bfd_elf_large_com_section)
4431 {
4432 *index = SHN_X86_64_LCOMMON;
4433 return TRUE;
4434 }
4435 return FALSE;
4436}
4437
4438/* Process a symbol. */
4439
4440static void
4441elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4442 asymbol *asym)
4443{
4444 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4445
4446 switch (elfsym->internal_elf_sym.st_shndx)
4447 {
4448 case SHN_X86_64_LCOMMON:
4449 asym->section = &_bfd_elf_large_com_section;
4450 asym->value = elfsym->internal_elf_sym.st_size;
4451 /* Common symbol doesn't set BSF_GLOBAL. */
4452 asym->flags &= ~BSF_GLOBAL;
4453 break;
4454 }
4455}
4456
4457static bfd_boolean
4458elf64_x86_64_common_definition (Elf_Internal_Sym *sym)
4459{
4460 return (sym->st_shndx == SHN_COMMON
4461 || sym->st_shndx == SHN_X86_64_LCOMMON);
4462}
4463
4464static unsigned int
4465elf64_x86_64_common_section_index (asection *sec)
4466{
4467 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4468 return SHN_COMMON;
4469 else
4470 return SHN_X86_64_LCOMMON;
4471}
4472
4473static asection *
4474elf64_x86_64_common_section (asection *sec)
4475{
4476 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4477 return bfd_com_section_ptr;
4478 else
4479 return &_bfd_elf_large_com_section;
4480}
4481
4482static bfd_boolean
4483elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
4484 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
4485 struct elf_link_hash_entry *h,
4486 Elf_Internal_Sym *sym,
00492999 4487 asection **psec,
3b22753a
L		 4488 bfd_vma *pvalue ATTRIBUTE_UNUSED,
4489 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
4490 bfd_boolean *skip ATTRIBUTE_UNUSED,
4491 bfd_boolean *override ATTRIBUTE_UNUSED,
4492 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
4493 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
4494 bfd_boolean *newdef ATTRIBUTE_UNUSED,
4495 bfd_boolean *newdyn,
4496 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
4497 bfd_boolean *newweak ATTRIBUTE_UNUSED,
4498 bfd *abfd ATTRIBUTE_UNUSED,
4499 asection **sec,
4500 bfd_boolean *olddef ATTRIBUTE_UNUSED,
4501 bfd_boolean *olddyn,
4502 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
4503 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
00492999 4504 bfd *oldbfd,
3b22753a
L		 4505 asection **oldsec)
4506{
4507 /* A normal common symbol and a large common symbol result in a
00492999
L		 4508 normal common symbol. We turn the large common symbol into a
4509 normal one. */
3b22753a
L		 4510 if (!*olddyn
4511 && h->root.type == bfd_link_hash_common
4512 && !*newdyn
4513 && bfd_is_com_section (*sec)
00492999 4514 && *oldsec != *sec)
3b22753a 4515 {
00492999
L		 4516 if (sym->st_shndx == SHN_COMMON
4517 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
4518 {
4519 h->root.u.c.p->section
4520 = bfd_make_section_old_way (oldbfd, "COMMON");
4521 h->root.u.c.p->section->flags = SEC_ALLOC;
4522 }
4523 else if (sym->st_shndx == SHN_X86_64_LCOMMON
4524 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
9a2e389a 4525 *psec = *sec = bfd_com_section_ptr;
3b22753a
L		 4526 }
4527
4528 return TRUE;
4529}
4530
4531static int
a6b96beb
AM		 4532elf64_x86_64_additional_program_headers (bfd *abfd,
4533 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3b22753a
L		 4534{
4535 asection *s;
9a2e389a 4536 int count = 0;
3b22753a
L		 4537
4538 /* Check to see if we need a large readonly segment. */
4539 s = bfd_get_section_by_name (abfd, ".lrodata");
4540 if (s && (s->flags & SEC_LOAD))
4541 count++;
4542
4543 /* Check to see if we need a large data segment. Since .lbss sections
4544 is placed right after the .bss section, there should be no need for
4545 a large data segment just because of .lbss. */
4546 s = bfd_get_section_by_name (abfd, ".ldata");
4547 if (s && (s->flags & SEC_LOAD))
4548 count++;
4549
4550 return count;
4551}
4552
fdc90cb4
JJ		 4553/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4554
4555static bfd_boolean
4556elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h)
4557{
4558 if (h->plt.offset != (bfd_vma) -1
4559 && !h->def_regular
4560 && !h->pointer_equality_needed)
4561 return FALSE;
4562
4563 return _bfd_elf_hash_symbol (h);
4564}
4565
9a2e389a 4566static const struct bfd_elf_special_section
3b22753a
L		 4567 elf64_x86_64_special_sections[]=
4568{
0112cd26
NC		 4569 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4570 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4571 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
4572 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4573 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4574 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4575 { NULL, 0, 0, 0, 0 }
3b22753a
L		 4576};
4577
70256ad8
AJ		 4578#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4579#define TARGET_LITTLE_NAME "elf64-x86-64"
4580#define ELF_ARCH bfd_arch_i386
4581#define ELF_MACHINE_CODE EM_X86_64
f7661549 4582#define ELF_MAXPAGESIZE 0x200000
2043964e 4583#define ELF_MINPAGESIZE 0x1000
24718e3b 4584#define ELF_COMMONPAGESIZE 0x1000
70256ad8
AJ		 4585
4586#define elf_backend_can_gc_sections 1
51b64d56 4587#define elf_backend_can_refcount 1
70256ad8
AJ		 4588#define elf_backend_want_got_plt 1
4589#define elf_backend_plt_readonly 1
4590#define elf_backend_want_plt_sym 0
4591#define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
b491616a 4592#define elf_backend_rela_normal 1
70256ad8
AJ		 4593
4594#define elf_info_to_howto elf64_x86_64_info_to_howto
70256ad8 4595
70256ad8
AJ		 4596#define bfd_elf64_bfd_link_hash_table_create \
4597 elf64_x86_64_link_hash_table_create
c25bc9fc
L		 4598#define bfd_elf64_bfd_link_hash_table_free \
4599 elf64_x86_64_link_hash_table_free
407443a3 4600#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
157090f7
AM		 4601#define bfd_elf64_bfd_reloc_name_lookup \
4602 elf64_x86_64_reloc_name_lookup
70256ad8
AJ		 4603
4604#define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
13285a1b 4605#define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
70256ad8 4606#define elf_backend_check_relocs elf64_x86_64_check_relocs
c434dee6
AJ		 4607#define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
4608#define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
4609#define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
70256ad8
AJ		 4610#define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
4611#define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
4612#define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
3bab7989
ML		 4613#define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
4614#define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
c434dee6 4615#define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
70256ad8
AJ		 4616#define elf_backend_relocate_section elf64_x86_64_relocate_section
4617#define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
67a4f2b7 4618#define elf_backend_always_size_sections elf64_x86_64_always_size_sections
74541ad4 4619#define elf_backend_init_index_section _bfd_elf_init_1_index_section
4c45e5c9 4620#define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
407443a3 4621#define elf_backend_object_p elf64_x86_64_elf_object_p
bffbf940 4622#define bfd_elf64_mkobject elf64_x86_64_mkobject
8d88c4ca 4623
d2b2c203
DJ		 4624#define elf_backend_section_from_shdr \
4625 elf64_x86_64_section_from_shdr
4626
3b22753a
L		 4627#define elf_backend_section_from_bfd_section \
4628 elf64_x86_64_elf_section_from_bfd_section
4629#define elf_backend_add_symbol_hook \
4630 elf64_x86_64_add_symbol_hook
4631#define elf_backend_symbol_processing \
4632 elf64_x86_64_symbol_processing
4633#define elf_backend_common_section_index \
4634 elf64_x86_64_common_section_index
4635#define elf_backend_common_section \
4636 elf64_x86_64_common_section
4637#define elf_backend_common_definition \
4638 elf64_x86_64_common_definition
4639#define elf_backend_merge_symbol \
4640 elf64_x86_64_merge_symbol
4641#define elf_backend_special_sections \
4642 elf64_x86_64_special_sections
4643#define elf_backend_additional_program_headers \
4644 elf64_x86_64_additional_program_headers
fdc90cb4
JJ		 4645#define elf_backend_hash_symbol \
4646 elf64_x86_64_hash_symbol
3b22753a 4647
d8045f23
NC		 4648#undef elf_backend_post_process_headers
4649#define elf_backend_post_process_headers _bfd_elf_set_osabi
4650
8d88c4ca 4651#include "elf64-target.h"
9d7cbccd
NC		 4652
4653/* FreeBSD support. */
4654
4655#undef TARGET_LITTLE_SYM
4656#define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4657#undef TARGET_LITTLE_NAME
4658#define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4659
d1036acb
L		 4660#undef ELF_OSABI
4661#define ELF_OSABI ELFOSABI_FREEBSD
9d7cbccd 4662
9d7cbccd
NC		 4663#undef elf64_bed
4664#define elf64_bed elf64_x86_64_fbsd_bed
4665
4666#include "elf64-target.h"
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