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1/* X86-64 specific support for ELF
2 Copyright (C) 2000-2017 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22#include "sysdep.h"
23#include "bfd.h"
24#include "bfdlink.h"
25#include "libbfd.h"
26#include "elf-bfd.h"
27#include "elf-nacl.h"
28#include "bfd_stdint.h"
29#include "objalloc.h"
30#include "hashtab.h"
31#include "dwarf2.h"
32#include "libiberty.h"
33
34#include "opcode/i386.h"
35#include "elf/x86-64.h"
36
37#ifdef CORE_HEADER
38#include <stdarg.h>
39#include CORE_HEADER
40#endif
41
42/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
43#define MINUS_ONE (~ (bfd_vma) 0)
44
45/* Since both 32-bit and 64-bit x86-64 encode relocation type in the
46 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
47 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
48 since they are the same. */
49
50#define ABI_64_P(abfd) \
51 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
52
53/* The relocation "howto" table. Order of fields:
54 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
55 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
56static reloc_howto_type x86_64_elf_howto_table[] =
57{
58 HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
59 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
60 FALSE),
61 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
63 FALSE),
64 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
65 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
66 TRUE),
67 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
68 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
69 FALSE),
70 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
71 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
72 TRUE),
73 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
74 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
75 FALSE),
76 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
78 MINUS_ONE, FALSE),
79 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
81 MINUS_ONE, FALSE),
82 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
84 MINUS_ONE, FALSE),
85 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
86 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
87 0xffffffff, TRUE),
88 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
89 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
90 FALSE),
91 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
92 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
93 FALSE),
94 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
96 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
98 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
100 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
101 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
102 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
104 MINUS_ONE, FALSE),
105 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
107 MINUS_ONE, FALSE),
108 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
110 MINUS_ONE, FALSE),
111 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
112 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
113 0xffffffff, TRUE),
114 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
115 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
116 0xffffffff, TRUE),
117 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
118 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
119 0xffffffff, FALSE),
120 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
121 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
122 0xffffffff, TRUE),
123 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
124 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
125 0xffffffff, FALSE),
126 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
128 TRUE),
129 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
131 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
132 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
133 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
134 FALSE, 0xffffffff, 0xffffffff, TRUE),
135 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
136 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
137 FALSE),
138 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
139 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
140 MINUS_ONE, TRUE),
141 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
142 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
143 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
144 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
145 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
146 MINUS_ONE, FALSE),
147 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
148 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
149 MINUS_ONE, FALSE),
150 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
151 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
152 FALSE),
153 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
154 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
155 FALSE),
156 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
157 complain_overflow_bitfield, bfd_elf_generic_reloc,
158 "R_X86_64_GOTPC32_TLSDESC",
159 FALSE, 0xffffffff, 0xffffffff, TRUE),
160 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
161 complain_overflow_dont, bfd_elf_generic_reloc,
162 "R_X86_64_TLSDESC_CALL",
163 FALSE, 0, 0, FALSE),
164 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
165 complain_overflow_bitfield, bfd_elf_generic_reloc,
166 "R_X86_64_TLSDESC",
167 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
168 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
170 MINUS_ONE, FALSE),
171 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
172 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
173 MINUS_ONE, FALSE),
174 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
175 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
176 TRUE),
177 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
178 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
179 TRUE),
180 HOWTO(R_X86_64_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
181 bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", FALSE, 0xffffffff,
182 0xffffffff, TRUE),
183 HOWTO(R_X86_64_REX_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
184 bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", FALSE, 0xffffffff,
185 0xffffffff, TRUE),
186
187 /* We have a gap in the reloc numbers here.
188 R_X86_64_standard counts the number up to this point, and
189 R_X86_64_vt_offset is the value to subtract from a reloc type of
190 R_X86_64_GNU_VT* to form an index into this table. */
191#define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
192#define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
193
194/* GNU extension to record C++ vtable hierarchy. */
195 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
196 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
197
198/* GNU extension to record C++ vtable member usage. */
199 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
200 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
201 FALSE),
202
203/* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
204 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
205 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
206 FALSE)
207};
208
209#define IS_X86_64_PCREL_TYPE(TYPE) \
210 ( ((TYPE) == R_X86_64_PC8) \
211 || ((TYPE) == R_X86_64_PC16) \
212 || ((TYPE) == R_X86_64_PC32) \
213 || ((TYPE) == R_X86_64_PC32_BND) \
214 || ((TYPE) == R_X86_64_PC64))
215
216/* Map BFD relocs to the x86_64 elf relocs. */
217struct elf_reloc_map
218{
219 bfd_reloc_code_real_type bfd_reloc_val;
220 unsigned char elf_reloc_val;
221};
222
223static const struct elf_reloc_map x86_64_reloc_map[] =
224{
225 { BFD_RELOC_NONE, R_X86_64_NONE, },
226 { BFD_RELOC_64, R_X86_64_64, },
227 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
228 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
229 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
230 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
231 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
232 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
233 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
234 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
235 { BFD_RELOC_32, R_X86_64_32, },
236 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
237 { BFD_RELOC_16, R_X86_64_16, },
238 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
239 { BFD_RELOC_8, R_X86_64_8, },
240 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
241 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
242 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
243 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
244 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
245 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
246 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
247 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
248 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
249 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
250 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
251 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
252 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
253 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
254 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
255 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
256 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
257 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
258 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
259 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
260 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
261 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
262 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
263 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, },
264 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, },
265 { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, },
266 { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, },
267 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
268 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
269};
270
271static reloc_howto_type *
272elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
273{
274 unsigned i;
275
276 if (r_type == (unsigned int) R_X86_64_32)
277 {
278 if (ABI_64_P (abfd))
279 i = r_type;
280 else
281 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
282 }
283 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
284 || r_type >= (unsigned int) R_X86_64_max)
285 {
286 if (r_type >= (unsigned int) R_X86_64_standard)
287 {
288 /* xgettext:c-format */
289 _bfd_error_handler (_("%B: invalid relocation type %d"),
290 abfd, (int) r_type);
291 r_type = R_X86_64_NONE;
292 }
293 i = r_type;
294 }
295 else
296 i = r_type - (unsigned int) R_X86_64_vt_offset;
297 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
298 return &x86_64_elf_howto_table[i];
299}
300
301/* Given a BFD reloc type, return a HOWTO structure. */
302static reloc_howto_type *
303elf_x86_64_reloc_type_lookup (bfd *abfd,
304 bfd_reloc_code_real_type code)
305{
306 unsigned int i;
307
308 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
309 i++)
310 {
311 if (x86_64_reloc_map[i].bfd_reloc_val == code)
312 return elf_x86_64_rtype_to_howto (abfd,
313 x86_64_reloc_map[i].elf_reloc_val);
314 }
315 return NULL;
316}
317
318static reloc_howto_type *
319elf_x86_64_reloc_name_lookup (bfd *abfd,
320 const char *r_name)
321{
322 unsigned int i;
323
324 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
325 {
326 /* Get x32 R_X86_64_32. */
327 reloc_howto_type *reloc
328 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
329 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
330 return reloc;
331 }
332
333 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
334 if (x86_64_elf_howto_table[i].name != NULL
335 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
336 return &x86_64_elf_howto_table[i];
337
338 return NULL;
339}
340
341/* Given an x86_64 ELF reloc type, fill in an arelent structure. */
342
343static void
344elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
345 Elf_Internal_Rela *dst)
346{
347 unsigned r_type;
348
349 r_type = ELF32_R_TYPE (dst->r_info);
350 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
351 BFD_ASSERT (r_type == cache_ptr->howto->type);
352}
353\f
354/* Support for core dump NOTE sections. */
355static bfd_boolean
356elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
357{
358 int offset;
359 size_t size;
360
361 switch (note->descsz)
362 {
363 default:
364 return FALSE;
365
366 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
367 /* pr_cursig */
368 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
369
370 /* pr_pid */
371 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
372
373 /* pr_reg */
374 offset = 72;
375 size = 216;
376
377 break;
378
379 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
380 /* pr_cursig */
381 elf_tdata (abfd)->core->signal
382 = bfd_get_16 (abfd, note->descdata + 12);
383
384 /* pr_pid */
385 elf_tdata (abfd)->core->lwpid
386 = bfd_get_32 (abfd, note->descdata + 32);
387
388 /* pr_reg */
389 offset = 112;
390 size = 216;
391
392 break;
393 }
394
395 /* Make a ".reg/999" section. */
396 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
397 size, note->descpos + offset);
398}
399
400static bfd_boolean
401elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
402{
403 switch (note->descsz)
404 {
405 default:
406 return FALSE;
407
408 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
409 elf_tdata (abfd)->core->pid
410 = bfd_get_32 (abfd, note->descdata + 12);
411 elf_tdata (abfd)->core->program
412 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
413 elf_tdata (abfd)->core->command
414 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
415 break;
416
417 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
418 elf_tdata (abfd)->core->pid
419 = bfd_get_32 (abfd, note->descdata + 24);
420 elf_tdata (abfd)->core->program
421 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
422 elf_tdata (abfd)->core->command
423 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
424 }
425
426 /* Note that for some reason, a spurious space is tacked
427 onto the end of the args in some (at least one anyway)
428 implementations, so strip it off if it exists. */
429
430 {
431 char *command = elf_tdata (abfd)->core->command;
432 int n = strlen (command);
433
434 if (0 < n && command[n - 1] == ' ')
435 command[n - 1] = '\0';
436 }
437
438 return TRUE;
439}
440
441#ifdef CORE_HEADER
442static char *
443elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
444 int note_type, ...)
445{
446 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
447 va_list ap;
448 const char *fname, *psargs;
449 long pid;
450 int cursig;
451 const void *gregs;
452
453 switch (note_type)
454 {
455 default:
456 return NULL;
457
458 case NT_PRPSINFO:
459 va_start (ap, note_type);
460 fname = va_arg (ap, const char *);
461 psargs = va_arg (ap, const char *);
462 va_end (ap);
463
464 if (bed->s->elfclass == ELFCLASS32)
465 {
466 prpsinfo32_t data;
467 memset (&data, 0, sizeof (data));
468 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
469 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
470 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
471 &data, sizeof (data));
472 }
473 else
474 {
475 prpsinfo64_t data;
476 memset (&data, 0, sizeof (data));
477 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
478 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
479 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
480 &data, sizeof (data));
481 }
482 /* NOTREACHED */
483
484 case NT_PRSTATUS:
485 va_start (ap, note_type);
486 pid = va_arg (ap, long);
487 cursig = va_arg (ap, int);
488 gregs = va_arg (ap, const void *);
489 va_end (ap);
490
491 if (bed->s->elfclass == ELFCLASS32)
492 {
493 if (bed->elf_machine_code == EM_X86_64)
494 {
495 prstatusx32_t prstat;
496 memset (&prstat, 0, sizeof (prstat));
497 prstat.pr_pid = pid;
498 prstat.pr_cursig = cursig;
499 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
500 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
501 &prstat, sizeof (prstat));
502 }
503 else
504 {
505 prstatus32_t prstat;
506 memset (&prstat, 0, sizeof (prstat));
507 prstat.pr_pid = pid;
508 prstat.pr_cursig = cursig;
509 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
510 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
511 &prstat, sizeof (prstat));
512 }
513 }
514 else
515 {
516 prstatus64_t prstat;
517 memset (&prstat, 0, sizeof (prstat));
518 prstat.pr_pid = pid;
519 prstat.pr_cursig = cursig;
520 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
521 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
522 &prstat, sizeof (prstat));
523 }
524 }
525 /* NOTREACHED */
526}
527#endif
528\f
529/* Functions for the x86-64 ELF linker. */
530
531/* The name of the dynamic interpreter. This is put in the .interp
532 section. */
533
534#define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
535#define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
536
537/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
540 shared lib. */
541#define ELIMINATE_COPY_RELOCS 1
542
543/* The size in bytes of an entry in the global offset table. */
544
545#define GOT_ENTRY_SIZE 8
546
547/* The size in bytes of an entry in the procedure linkage table. */
548
549#define PLT_ENTRY_SIZE 16
550
551/* The first entry in a procedure linkage table looks like this. See the
552 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
553
554static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
555{
556 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
557 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
558 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
559};
560
561/* Subsequent entries in a procedure linkage table look like this. */
562
563static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
564{
565 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
566 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
567 0x68, /* pushq immediate */
568 0, 0, 0, 0, /* replaced with index into relocation table. */
569 0xe9, /* jmp relative */
570 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
571};
572
573/* The first entry in a procedure linkage table with BND relocations
574 like this. */
575
576static const bfd_byte elf_x86_64_bnd_plt0_entry[PLT_ENTRY_SIZE] =
577{
578 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
579 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
580 0x0f, 0x1f, 0 /* nopl (%rax) */
581};
582
583/* Subsequent entries for legacy branches in a procedure linkage table
584 with BND relocations look like this. */
585
586static const bfd_byte elf_x86_64_legacy_plt_entry[PLT_ENTRY_SIZE] =
587{
588 0x68, 0, 0, 0, 0, /* pushq immediate */
589 0xe9, 0, 0, 0, 0, /* jmpq relative */
590 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
591};
592
593/* Subsequent entries for branches with BND prefx in a procedure linkage
594 table with BND relocations look like this. */
595
596static const bfd_byte elf_x86_64_bnd_plt_entry[PLT_ENTRY_SIZE] =
597{
598 0x68, 0, 0, 0, 0, /* pushq immediate */
599 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
600 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
601};
602
603/* Entries for legacy branches in the second procedure linkage table
604 look like this. */
605
606static const bfd_byte elf_x86_64_legacy_plt2_entry[8] =
607{
608 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
609 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
610 0x66, 0x90 /* xchg %ax,%ax */
611};
612
613/* Entries for branches with BND prefix in the second procedure linkage
614 table look like this. */
615
616static const bfd_byte elf_x86_64_bnd_plt2_entry[8] =
617{
618 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
619 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
620 0x90 /* nop */
621};
622
623/* .eh_frame covering the .plt section. */
624
625static const bfd_byte elf_x86_64_eh_frame_plt[] =
626{
627#define PLT_CIE_LENGTH 20
628#define PLT_FDE_LENGTH 36
629#define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
630#define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
631 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
632 0, 0, 0, 0, /* CIE ID */
633 1, /* CIE version */
634 'z', 'R', 0, /* Augmentation string */
635 1, /* Code alignment factor */
636 0x78, /* Data alignment factor */
637 16, /* Return address column */
638 1, /* Augmentation size */
639 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
640 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
641 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
642 DW_CFA_nop, DW_CFA_nop,
643
644 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
645 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
646 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
647 0, 0, 0, 0, /* .plt size goes here */
648 0, /* Augmentation size */
649 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
650 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
651 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
652 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
653 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
654 11, /* Block length */
655 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
656 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
657 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
658 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
659 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
660};
661
662/* .eh_frame covering the BND .plt section. */
663
664static const bfd_byte elf_x86_64_eh_frame_bnd_plt[] =
665{
666 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
667 0, 0, 0, 0, /* CIE ID */
668 1, /* CIE version */
669 'z', 'R', 0, /* Augmentation string */
670 1, /* Code alignment factor */
671 0x78, /* Data alignment factor */
672 16, /* Return address column */
673 1, /* Augmentation size */
674 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
675 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
676 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
677 DW_CFA_nop, DW_CFA_nop,
678
679 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
680 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
681 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
682 0, 0, 0, 0, /* .plt size goes here */
683 0, /* Augmentation size */
684 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
685 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
686 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
687 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
688 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
689 11, /* Block length */
690 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
691 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
692 DW_OP_lit15, DW_OP_and, DW_OP_lit5, DW_OP_ge,
693 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
694 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
695};
696
697/* .eh_frame covering the .plt.got section. */
698
699static const bfd_byte elf_x86_64_eh_frame_plt_got[] =
700{
701#define PLT_GOT_FDE_LENGTH 20
702 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
703 0, 0, 0, 0, /* CIE ID */
704 1, /* CIE version */
705 'z', 'R', 0, /* Augmentation string */
706 1, /* Code alignment factor */
707 0x78, /* Data alignment factor */
708 16, /* Return address column */
709 1, /* Augmentation size */
710 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
711 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
712 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
713 DW_CFA_nop, DW_CFA_nop,
714
715 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
716 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
717 0, 0, 0, 0, /* the start of .plt.got goes here */
718 0, 0, 0, 0, /* .plt.got size goes here */
719 0, /* Augmentation size */
720 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop,
721 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
722};
723
724/* Architecture-specific backend data for x86-64. */
725
726struct elf_x86_64_backend_data
727{
728 /* Templates for the initial PLT entry and for subsequent entries. */
729 const bfd_byte *plt0_entry;
730 const bfd_byte *plt_entry;
731 unsigned int plt_entry_size; /* Size of each PLT entry. */
732
733 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
734 unsigned int plt0_got1_offset;
735 unsigned int plt0_got2_offset;
736
737 /* Offset of the end of the PC-relative instruction containing
738 plt0_got2_offset. */
739 unsigned int plt0_got2_insn_end;
740
741 /* Offsets into plt_entry that are to be replaced with... */
742 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
743 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
744 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
745
746 /* Length of the PC-relative instruction containing plt_got_offset. */
747 unsigned int plt_got_insn_size;
748
749 /* Offset of the end of the PC-relative jump to plt0_entry. */
750 unsigned int plt_plt_insn_end;
751
752 /* Offset into plt_entry where the initial value of the GOT entry points. */
753 unsigned int plt_lazy_offset;
754
755 /* .eh_frame covering the .plt section. */
756 const bfd_byte *eh_frame_plt;
757 unsigned int eh_frame_plt_size;
758
759 /* .eh_frame covering the .plt.got section. */
760 const bfd_byte *eh_frame_plt_got;
761 unsigned int eh_frame_plt_got_size;
762};
763
764#define get_elf_x86_64_arch_data(bed) \
765 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
766
767#define get_elf_x86_64_backend_data(abfd) \
768 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
769
770#define GET_PLT_ENTRY_SIZE(abfd) \
771 get_elf_x86_64_backend_data (abfd)->plt_entry_size
772
773/* These are the standard parameters. */
774static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
775 {
776 elf_x86_64_plt0_entry, /* plt0_entry */
777 elf_x86_64_plt_entry, /* plt_entry */
778 sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
779 2, /* plt0_got1_offset */
780 8, /* plt0_got2_offset */
781 12, /* plt0_got2_insn_end */
782 2, /* plt_got_offset */
783 7, /* plt_reloc_offset */
784 12, /* plt_plt_offset */
785 6, /* plt_got_insn_size */
786 PLT_ENTRY_SIZE, /* plt_plt_insn_end */
787 6, /* plt_lazy_offset */
788 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
789 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
790 elf_x86_64_eh_frame_plt_got, /* eh_frame_plt_got */
791 sizeof (elf_x86_64_eh_frame_plt_got), /* eh_frame_plt_got_size */
792 };
793
794static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed =
795 {
796 elf_x86_64_bnd_plt0_entry, /* plt0_entry */
797 elf_x86_64_bnd_plt_entry, /* plt_entry */
798 sizeof (elf_x86_64_bnd_plt_entry), /* plt_entry_size */
799 2, /* plt0_got1_offset */
800 1+8, /* plt0_got2_offset */
801 1+12, /* plt0_got2_insn_end */
802 1+2, /* plt_got_offset */
803 1, /* plt_reloc_offset */
804 7, /* plt_plt_offset */
805 1+6, /* plt_got_insn_size */
806 11, /* plt_plt_insn_end */
807 0, /* plt_lazy_offset */
808 elf_x86_64_eh_frame_bnd_plt, /* eh_frame_plt */
809 sizeof (elf_x86_64_eh_frame_bnd_plt), /* eh_frame_plt_size */
810 elf_x86_64_eh_frame_plt_got, /* eh_frame_plt_got */
811 sizeof (elf_x86_64_eh_frame_plt_got), /* eh_frame_plt_got_size */
812 };
813
814#define elf_backend_arch_data &elf_x86_64_arch_bed
815
816/* Is a undefined weak symbol which is resolved to 0. Reference to an
817 undefined weak symbol is resolved to 0 when building executable if
818 it isn't dynamic and
819 1. Has non-GOT/non-PLT relocations in text section. Or
820 2. Has no GOT/PLT relocation.
821 */
822#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
823 ((EH)->elf.root.type == bfd_link_hash_undefweak \
824 && bfd_link_executable (INFO) \
825 && (elf_x86_64_hash_table (INFO)->interp == NULL \
826 || !(GOT_RELOC) \
827 || (EH)->has_non_got_reloc \
828 || !(INFO)->dynamic_undefined_weak))
829
830/* x86-64 ELF linker hash entry. */
831
832struct elf_x86_64_link_hash_entry
833{
834 struct elf_link_hash_entry elf;
835
836 /* Track dynamic relocs copied for this symbol. */
837 struct elf_dyn_relocs *dyn_relocs;
838
839#define GOT_UNKNOWN 0
840#define GOT_NORMAL 1
841#define GOT_TLS_GD 2
842#define GOT_TLS_IE 3
843#define GOT_TLS_GDESC 4
844#define GOT_TLS_GD_BOTH_P(type) \
845 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
846#define GOT_TLS_GD_P(type) \
847 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
848#define GOT_TLS_GDESC_P(type) \
849 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
850#define GOT_TLS_GD_ANY_P(type) \
851 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
852 unsigned char tls_type;
853
854 /* TRUE if a weak symbol with a real definition needs a copy reloc.
855 When there is a weak symbol with a real definition, the processor
856 independent code will have arranged for us to see the real
857 definition first. We need to copy the needs_copy bit from the
858 real definition and check it when allowing copy reloc in PIE. */
859 unsigned int needs_copy : 1;
860
861 /* TRUE if symbol has at least one BND relocation. */
862 unsigned int has_bnd_reloc : 1;
863
864 /* TRUE if symbol has GOT or PLT relocations. */
865 unsigned int has_got_reloc : 1;
866
867 /* TRUE if symbol has non-GOT/non-PLT relocations in text sections. */
868 unsigned int has_non_got_reloc : 1;
869
870 /* 0: symbol isn't __tls_get_addr.
871 1: symbol is __tls_get_addr.
872 2: symbol is unknown. */
873 unsigned int tls_get_addr : 2;
874
875 /* Reference count of C/C++ function pointer relocations in read-write
876 section which can be resolved at run-time. */
877 bfd_signed_vma func_pointer_refcount;
878
879 /* Information about the GOT PLT entry. Filled when there are both
880 GOT and PLT relocations against the same function. */
881 union gotplt_union plt_got;
882
883 /* Information about the second PLT entry. Filled when has_bnd_reloc is
884 set. */
885 union gotplt_union plt_bnd;
886
887 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
888 starting at the end of the jump table. */
889 bfd_vma tlsdesc_got;
890};
891
892#define elf_x86_64_hash_entry(ent) \
893 ((struct elf_x86_64_link_hash_entry *)(ent))
894
895struct elf_x86_64_obj_tdata
896{
897 struct elf_obj_tdata root;
898
899 /* tls_type for each local got entry. */
900 char *local_got_tls_type;
901
902 /* GOTPLT entries for TLS descriptors. */
903 bfd_vma *local_tlsdesc_gotent;
904};
905
906#define elf_x86_64_tdata(abfd) \
907 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
908
909#define elf_x86_64_local_got_tls_type(abfd) \
910 (elf_x86_64_tdata (abfd)->local_got_tls_type)
911
912#define elf_x86_64_local_tlsdesc_gotent(abfd) \
913 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
914
915#define is_x86_64_elf(bfd) \
916 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
917 && elf_tdata (bfd) != NULL \
918 && elf_object_id (bfd) == X86_64_ELF_DATA)
919
920static bfd_boolean
921elf_x86_64_mkobject (bfd *abfd)
922{
923 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
924 X86_64_ELF_DATA);
925}
926
927/* x86-64 ELF linker hash table. */
928
929struct elf_x86_64_link_hash_table
930{
931 struct elf_link_hash_table elf;
932
933 /* Short-cuts to get to dynamic linker sections. */
934 asection *interp;
935 asection *plt_eh_frame;
936 asection *plt_bnd;
937 asection *plt_bnd_eh_frame;
938 asection *plt_got;
939 asection *plt_got_eh_frame;
940
941 union
942 {
943 bfd_signed_vma refcount;
944 bfd_vma offset;
945 } tls_ld_got;
946
947 /* The amount of space used by the jump slots in the GOT. */
948 bfd_vma sgotplt_jump_table_size;
949
950 /* Small local sym cache. */
951 struct sym_cache sym_cache;
952
953 bfd_vma (*r_info) (bfd_vma, bfd_vma);
954 bfd_vma (*r_sym) (bfd_vma);
955 unsigned int pointer_r_type;
956 const char *dynamic_interpreter;
957 int dynamic_interpreter_size;
958
959 /* _TLS_MODULE_BASE_ symbol. */
960 struct bfd_link_hash_entry *tls_module_base;
961
962 /* Used by local STT_GNU_IFUNC symbols. */
963 htab_t loc_hash_table;
964 void * loc_hash_memory;
965
966 /* The offset into splt of the PLT entry for the TLS descriptor
967 resolver. Special values are 0, if not necessary (or not found
968 to be necessary yet), and -1 if needed but not determined
969 yet. */
970 bfd_vma tlsdesc_plt;
971 /* The offset into sgot of the GOT entry used by the PLT entry
972 above. */
973 bfd_vma tlsdesc_got;
974
975 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
976 bfd_vma next_jump_slot_index;
977 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
978 bfd_vma next_irelative_index;
979
980 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
981 to read-only sections. */
982 bfd_boolean readonly_dynrelocs_against_ifunc;
983};
984
985/* Get the x86-64 ELF linker hash table from a link_info structure. */
986
987#define elf_x86_64_hash_table(p) \
988 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
989 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
990
991#define elf_x86_64_compute_jump_table_size(htab) \
992 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
993
994/* Create an entry in an x86-64 ELF linker hash table. */
995
996static struct bfd_hash_entry *
997elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
998 struct bfd_hash_table *table,
999 const char *string)
1000{
1001 /* Allocate the structure if it has not already been allocated by a
1002 subclass. */
1003 if (entry == NULL)
1004 {
1005 entry = (struct bfd_hash_entry *)
1006 bfd_hash_allocate (table,
1007 sizeof (struct elf_x86_64_link_hash_entry));
1008 if (entry == NULL)
1009 return entry;
1010 }
1011
1012 /* Call the allocation method of the superclass. */
1013 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
1014 if (entry != NULL)
1015 {
1016 struct elf_x86_64_link_hash_entry *eh;
1017
1018 eh = (struct elf_x86_64_link_hash_entry *) entry;
1019 eh->dyn_relocs = NULL;
1020 eh->tls_type = GOT_UNKNOWN;
1021 eh->needs_copy = 0;
1022 eh->has_bnd_reloc = 0;
1023 eh->has_got_reloc = 0;
1024 eh->has_non_got_reloc = 0;
1025 eh->tls_get_addr = 2;
1026 eh->func_pointer_refcount = 0;
1027 eh->plt_bnd.offset = (bfd_vma) -1;
1028 eh->plt_got.offset = (bfd_vma) -1;
1029 eh->tlsdesc_got = (bfd_vma) -1;
1030 }
1031
1032 return entry;
1033}
1034
1035/* Compute a hash of a local hash entry. We use elf_link_hash_entry
1036 for local symbol so that we can handle local STT_GNU_IFUNC symbols
1037 as global symbol. We reuse indx and dynstr_index for local symbol
1038 hash since they aren't used by global symbols in this backend. */
1039
1040static hashval_t
1041elf_x86_64_local_htab_hash (const void *ptr)
1042{
1043 struct elf_link_hash_entry *h
1044 = (struct elf_link_hash_entry *) ptr;
1045 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
1046}
1047
1048/* Compare local hash entries. */
1049
1050static int
1051elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
1052{
1053 struct elf_link_hash_entry *h1
1054 = (struct elf_link_hash_entry *) ptr1;
1055 struct elf_link_hash_entry *h2
1056 = (struct elf_link_hash_entry *) ptr2;
1057
1058 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
1059}
1060
1061/* Find and/or create a hash entry for local symbol. */
1062
1063static struct elf_link_hash_entry *
1064elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
1065 bfd *abfd, const Elf_Internal_Rela *rel,
1066 bfd_boolean create)
1067{
1068 struct elf_x86_64_link_hash_entry e, *ret;
1069 asection *sec = abfd->sections;
1070 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
1071 htab->r_sym (rel->r_info));
1072 void **slot;
1073
1074 e.elf.indx = sec->id;
1075 e.elf.dynstr_index = htab->r_sym (rel->r_info);
1076 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
1077 create ? INSERT : NO_INSERT);
1078
1079 if (!slot)
1080 return NULL;
1081
1082 if (*slot)
1083 {
1084 ret = (struct elf_x86_64_link_hash_entry *) *slot;
1085 return &ret->elf;
1086 }
1087
1088 ret = (struct elf_x86_64_link_hash_entry *)
1089 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
1090 sizeof (struct elf_x86_64_link_hash_entry));
1091 if (ret)
1092 {
1093 memset (ret, 0, sizeof (*ret));
1094 ret->elf.indx = sec->id;
1095 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
1096 ret->elf.dynindx = -1;
1097 ret->func_pointer_refcount = 0;
1098 ret->plt_got.offset = (bfd_vma) -1;
1099 *slot = ret;
1100 }
1101 return &ret->elf;
1102}
1103
1104/* Destroy an X86-64 ELF linker hash table. */
1105
1106static void
1107elf_x86_64_link_hash_table_free (bfd *obfd)
1108{
1109 struct elf_x86_64_link_hash_table *htab
1110 = (struct elf_x86_64_link_hash_table *) obfd->link.hash;
1111
1112 if (htab->loc_hash_table)
1113 htab_delete (htab->loc_hash_table);
1114 if (htab->loc_hash_memory)
1115 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1116 _bfd_elf_link_hash_table_free (obfd);
1117}
1118
1119/* Create an X86-64 ELF linker hash table. */
1120
1121static struct bfd_link_hash_table *
1122elf_x86_64_link_hash_table_create (bfd *abfd)
1123{
1124 struct elf_x86_64_link_hash_table *ret;
1125 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
1126
1127 ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt);
1128 if (ret == NULL)
1129 return NULL;
1130
1131 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1132 elf_x86_64_link_hash_newfunc,
1133 sizeof (struct elf_x86_64_link_hash_entry),
1134 X86_64_ELF_DATA))
1135 {
1136 free (ret);
1137 return NULL;
1138 }
1139
1140 if (ABI_64_P (abfd))
1141 {
1142 ret->r_info = elf64_r_info;
1143 ret->r_sym = elf64_r_sym;
1144 ret->pointer_r_type = R_X86_64_64;
1145 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
1146 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
1147 }
1148 else
1149 {
1150 ret->r_info = elf32_r_info;
1151 ret->r_sym = elf32_r_sym;
1152 ret->pointer_r_type = R_X86_64_32;
1153 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
1154 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
1155 }
1156
1157 ret->loc_hash_table = htab_try_create (1024,
1158 elf_x86_64_local_htab_hash,
1159 elf_x86_64_local_htab_eq,
1160 NULL);
1161 ret->loc_hash_memory = objalloc_create ();
1162 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1163 {
1164 elf_x86_64_link_hash_table_free (abfd);
1165 return NULL;
1166 }
1167 ret->elf.root.hash_table_free = elf_x86_64_link_hash_table_free;
1168
1169 return &ret->elf.root;
1170}
1171
1172/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1173 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1174 hash table. */
1175
1176static bfd_boolean
1177elf_x86_64_create_dynamic_sections (bfd *dynobj,
1178 struct bfd_link_info *info)
1179{
1180 struct elf_x86_64_link_hash_table *htab;
1181
1182 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1183 return FALSE;
1184
1185 htab = elf_x86_64_hash_table (info);
1186 if (htab == NULL)
1187 return FALSE;
1188
1189 /* Set the contents of the .interp section to the interpreter. */
1190 if (bfd_link_executable (info) && !info->nointerp)
1191 {
1192 asection *s = bfd_get_linker_section (dynobj, ".interp");
1193 if (s == NULL)
1194 abort ();
1195 s->size = htab->dynamic_interpreter_size;
1196 s->contents = (unsigned char *) htab->dynamic_interpreter;
1197 htab->interp = s;
1198 }
1199
1200 if (!info->no_ld_generated_unwind_info
1201 && htab->plt_eh_frame == NULL
1202 && htab->elf.splt != NULL)
1203 {
1204 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1205 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1206 | SEC_LINKER_CREATED);
1207 htab->plt_eh_frame
1208 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1209 if (htab->plt_eh_frame == NULL
1210 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame,
1211 ABI_64_P (dynobj) ? 3 : 2))
1212 return FALSE;
1213 }
1214
1215 /* Align .got section to its entry size. */
1216 if (htab->elf.sgot != NULL
1217 && !bfd_set_section_alignment (dynobj, htab->elf.sgot, 3))
1218 return FALSE;
1219
1220 /* Align .got.plt section to its entry size. */
1221 if (htab->elf.sgotplt != NULL
1222 && !bfd_set_section_alignment (dynobj, htab->elf.sgotplt, 3))
1223 return FALSE;
1224
1225 return TRUE;
1226}
1227
1228/* Copy the extra info we tack onto an elf_link_hash_entry. */
1229
1230static void
1231elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1232 struct elf_link_hash_entry *dir,
1233 struct elf_link_hash_entry *ind)
1234{
1235 struct elf_x86_64_link_hash_entry *edir, *eind;
1236
1237 edir = (struct elf_x86_64_link_hash_entry *) dir;
1238 eind = (struct elf_x86_64_link_hash_entry *) ind;
1239
1240 edir->has_bnd_reloc |= eind->has_bnd_reloc;
1241 edir->has_got_reloc |= eind->has_got_reloc;
1242 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1243
1244 if (eind->dyn_relocs != NULL)
1245 {
1246 if (edir->dyn_relocs != NULL)
1247 {
1248 struct elf_dyn_relocs **pp;
1249 struct elf_dyn_relocs *p;
1250
1251 /* Add reloc counts against the indirect sym to the direct sym
1252 list. Merge any entries against the same section. */
1253 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1254 {
1255 struct elf_dyn_relocs *q;
1256
1257 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1258 if (q->sec == p->sec)
1259 {
1260 q->pc_count += p->pc_count;
1261 q->count += p->count;
1262 *pp = p->next;
1263 break;
1264 }
1265 if (q == NULL)
1266 pp = &p->next;
1267 }
1268 *pp = edir->dyn_relocs;
1269 }
1270
1271 edir->dyn_relocs = eind->dyn_relocs;
1272 eind->dyn_relocs = NULL;
1273 }
1274
1275 if (ind->root.type == bfd_link_hash_indirect
1276 && dir->got.refcount <= 0)
1277 {
1278 edir->tls_type = eind->tls_type;
1279 eind->tls_type = GOT_UNKNOWN;
1280 }
1281
1282 if (ELIMINATE_COPY_RELOCS
1283 && ind->root.type != bfd_link_hash_indirect
1284 && dir->dynamic_adjusted)
1285 {
1286 /* If called to transfer flags for a weakdef during processing
1287 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1288 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1289 if (dir->versioned != versioned_hidden)
1290 dir->ref_dynamic |= ind->ref_dynamic;
1291 dir->ref_regular |= ind->ref_regular;
1292 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1293 dir->needs_plt |= ind->needs_plt;
1294 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1295 }
1296 else
1297 {
1298 if (eind->func_pointer_refcount > 0)
1299 {
1300 edir->func_pointer_refcount += eind->func_pointer_refcount;
1301 eind->func_pointer_refcount = 0;
1302 }
1303
1304 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1305 }
1306}
1307
1308static bfd_boolean
1309elf64_x86_64_elf_object_p (bfd *abfd)
1310{
1311 /* Set the right machine number for an x86-64 elf64 file. */
1312 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1313 return TRUE;
1314}
1315
1316static bfd_boolean
1317elf32_x86_64_elf_object_p (bfd *abfd)
1318{
1319 /* Set the right machine number for an x86-64 elf32 file. */
1320 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1321 return TRUE;
1322}
1323
1324/* Return TRUE if the TLS access code sequence support transition
1325 from R_TYPE. */
1326
1327static bfd_boolean
1328elf_x86_64_check_tls_transition (bfd *abfd,
1329 struct bfd_link_info *info,
1330 asection *sec,
1331 bfd_byte *contents,
1332 Elf_Internal_Shdr *symtab_hdr,
1333 struct elf_link_hash_entry **sym_hashes,
1334 unsigned int r_type,
1335 const Elf_Internal_Rela *rel,
1336 const Elf_Internal_Rela *relend)
1337{
1338 unsigned int val;
1339 unsigned long r_symndx;
1340 bfd_boolean largepic = FALSE;
1341 struct elf_link_hash_entry *h;
1342 bfd_vma offset;
1343 struct elf_x86_64_link_hash_table *htab;
1344 bfd_byte *call;
1345 bfd_boolean indirect_call, tls_get_addr;
1346
1347 htab = elf_x86_64_hash_table (info);
1348 offset = rel->r_offset;
1349 switch (r_type)
1350 {
1351 case R_X86_64_TLSGD:
1352 case R_X86_64_TLSLD:
1353 if ((rel + 1) >= relend)
1354 return FALSE;
1355
1356 if (r_type == R_X86_64_TLSGD)
1357 {
1358 /* Check transition from GD access model. For 64bit, only
1359 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1360 .word 0x6666; rex64; call __tls_get_addr@PLT
1361 or
1362 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1363 .byte 0x66; rex64
1364 call *__tls_get_addr@GOTPCREL(%rip)
1365 which may be converted to
1366 addr32 call __tls_get_addr
1367 can transit to different access model. For 32bit, only
1368 leaq foo@tlsgd(%rip), %rdi
1369 .word 0x6666; rex64; call __tls_get_addr@PLT
1370 or
1371 leaq foo@tlsgd(%rip), %rdi
1372 .byte 0x66; rex64
1373 call *__tls_get_addr@GOTPCREL(%rip)
1374 which may be converted to
1375 addr32 call __tls_get_addr
1376 can transit to different access model. For largepic,
1377 we also support:
1378 leaq foo@tlsgd(%rip), %rdi
1379 movabsq $__tls_get_addr@pltoff, %rax
1380 addq $r15, %rax
1381 call *%rax
1382 or
1383 leaq foo@tlsgd(%rip), %rdi
1384 movabsq $__tls_get_addr@pltoff, %rax
1385 addq $rbx, %rax
1386 call *%rax */
1387
1388 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1389
1390 if ((offset + 12) > sec->size)
1391 return FALSE;
1392
1393 call = contents + offset + 4;
1394 if (call[0] != 0x66
1395 || !((call[1] == 0x48
1396 && call[2] == 0xff
1397 && call[3] == 0x15)
1398 || (call[1] == 0x48
1399 && call[2] == 0x67
1400 && call[3] == 0xe8)
1401 || (call[1] == 0x66
1402 && call[2] == 0x48
1403 && call[3] == 0xe8)))
1404 {
1405 if (!ABI_64_P (abfd)
1406 || (offset + 19) > sec->size
1407 || offset < 3
1408 || memcmp (call - 7, leaq + 1, 3) != 0
1409 || memcmp (call, "\x48\xb8", 2) != 0
1410 || call[11] != 0x01
1411 || call[13] != 0xff
1412 || call[14] != 0xd0
1413 || !((call[10] == 0x48 && call[12] == 0xd8)
1414 || (call[10] == 0x4c && call[12] == 0xf8)))
1415 return FALSE;
1416 largepic = TRUE;
1417 }
1418 else if (ABI_64_P (abfd))
1419 {
1420 if (offset < 4
1421 || memcmp (contents + offset - 4, leaq, 4) != 0)
1422 return FALSE;
1423 }
1424 else
1425 {
1426 if (offset < 3
1427 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1428 return FALSE;
1429 }
1430 indirect_call = call[2] == 0xff;
1431 }
1432 else
1433 {
1434 /* Check transition from LD access model. Only
1435 leaq foo@tlsld(%rip), %rdi;
1436 call __tls_get_addr@PLT
1437 or
1438 leaq foo@tlsld(%rip), %rdi;
1439 call *__tls_get_addr@GOTPCREL(%rip)
1440 which may be converted to
1441 addr32 call __tls_get_addr
1442 can transit to different access model. For largepic
1443 we also support:
1444 leaq foo@tlsld(%rip), %rdi
1445 movabsq $__tls_get_addr@pltoff, %rax
1446 addq $r15, %rax
1447 call *%rax
1448 or
1449 leaq foo@tlsld(%rip), %rdi
1450 movabsq $__tls_get_addr@pltoff, %rax
1451 addq $rbx, %rax
1452 call *%rax */
1453
1454 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1455
1456 if (offset < 3 || (offset + 9) > sec->size)
1457 return FALSE;
1458
1459 if (memcmp (contents + offset - 3, lea, 3) != 0)
1460 return FALSE;
1461
1462 call = contents + offset + 4;
1463 if (!(call[0] == 0xe8
1464 || (call[0] == 0xff && call[1] == 0x15)
1465 || (call[0] == 0x67 && call[1] == 0xe8)))
1466 {
1467 if (!ABI_64_P (abfd)
1468 || (offset + 19) > sec->size
1469 || memcmp (call, "\x48\xb8", 2) != 0
1470 || call[11] != 0x01
1471 || call[13] != 0xff
1472 || call[14] != 0xd0
1473 || !((call[10] == 0x48 && call[12] == 0xd8)
1474 || (call[10] == 0x4c && call[12] == 0xf8)))
1475 return FALSE;
1476 largepic = TRUE;
1477 }
1478 indirect_call = call[0] == 0xff;
1479 }
1480
1481 r_symndx = htab->r_sym (rel[1].r_info);
1482 if (r_symndx < symtab_hdr->sh_info)
1483 return FALSE;
1484
1485 tls_get_addr = FALSE;
1486 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1487 if (h != NULL && h->root.root.string != NULL)
1488 {
1489 struct elf_x86_64_link_hash_entry *eh
1490 = (struct elf_x86_64_link_hash_entry *) h;
1491 tls_get_addr = eh->tls_get_addr == 1;
1492 if (eh->tls_get_addr > 1)
1493 {
1494 /* Use strncmp to check __tls_get_addr since
1495 __tls_get_addr may be versioned. */
1496 if (strncmp (h->root.root.string, "__tls_get_addr", 14)
1497 == 0)
1498 {
1499 eh->tls_get_addr = 1;
1500 tls_get_addr = TRUE;
1501 }
1502 else
1503 eh->tls_get_addr = 0;
1504 }
1505 }
1506
1507 if (!tls_get_addr)
1508 return FALSE;
1509 else if (largepic)
1510 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64;
1511 else if (indirect_call)
1512 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_GOTPCRELX;
1513 else
1514 return (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1515 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
1516
1517 case R_X86_64_GOTTPOFF:
1518 /* Check transition from IE access model:
1519 mov foo@gottpoff(%rip), %reg
1520 add foo@gottpoff(%rip), %reg
1521 */
1522
1523 /* Check REX prefix first. */
1524 if (offset >= 3 && (offset + 4) <= sec->size)
1525 {
1526 val = bfd_get_8 (abfd, contents + offset - 3);
1527 if (val != 0x48 && val != 0x4c)
1528 {
1529 /* X32 may have 0x44 REX prefix or no REX prefix. */
1530 if (ABI_64_P (abfd))
1531 return FALSE;
1532 }
1533 }
1534 else
1535 {
1536 /* X32 may not have any REX prefix. */
1537 if (ABI_64_P (abfd))
1538 return FALSE;
1539 if (offset < 2 || (offset + 3) > sec->size)
1540 return FALSE;
1541 }
1542
1543 val = bfd_get_8 (abfd, contents + offset - 2);
1544 if (val != 0x8b && val != 0x03)
1545 return FALSE;
1546
1547 val = bfd_get_8 (abfd, contents + offset - 1);
1548 return (val & 0xc7) == 5;
1549
1550 case R_X86_64_GOTPC32_TLSDESC:
1551 /* Check transition from GDesc access model:
1552 leaq x@tlsdesc(%rip), %rax
1553
1554 Make sure it's a leaq adding rip to a 32-bit offset
1555 into any register, although it's probably almost always
1556 going to be rax. */
1557
1558 if (offset < 3 || (offset + 4) > sec->size)
1559 return FALSE;
1560
1561 val = bfd_get_8 (abfd, contents + offset - 3);
1562 if ((val & 0xfb) != 0x48)
1563 return FALSE;
1564
1565 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1566 return FALSE;
1567
1568 val = bfd_get_8 (abfd, contents + offset - 1);
1569 return (val & 0xc7) == 0x05;
1570
1571 case R_X86_64_TLSDESC_CALL:
1572 /* Check transition from GDesc access model:
1573 call *x@tlsdesc(%rax)
1574 */
1575 if (offset + 2 <= sec->size)
1576 {
1577 /* Make sure that it's a call *x@tlsdesc(%rax). */
1578 call = contents + offset;
1579 return call[0] == 0xff && call[1] == 0x10;
1580 }
1581
1582 return FALSE;
1583
1584 default:
1585 abort ();
1586 }
1587}
1588
1589/* Return TRUE if the TLS access transition is OK or no transition
1590 will be performed. Update R_TYPE if there is a transition. */
1591
1592static bfd_boolean
1593elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1594 asection *sec, bfd_byte *contents,
1595 Elf_Internal_Shdr *symtab_hdr,
1596 struct elf_link_hash_entry **sym_hashes,
1597 unsigned int *r_type, int tls_type,
1598 const Elf_Internal_Rela *rel,
1599 const Elf_Internal_Rela *relend,
1600 struct elf_link_hash_entry *h,
1601 unsigned long r_symndx,
1602 bfd_boolean from_relocate_section)
1603{
1604 unsigned int from_type = *r_type;
1605 unsigned int to_type = from_type;
1606 bfd_boolean check = TRUE;
1607
1608 /* Skip TLS transition for functions. */
1609 if (h != NULL
1610 && (h->type == STT_FUNC
1611 || h->type == STT_GNU_IFUNC))
1612 return TRUE;
1613
1614 switch (from_type)
1615 {
1616 case R_X86_64_TLSGD:
1617 case R_X86_64_GOTPC32_TLSDESC:
1618 case R_X86_64_TLSDESC_CALL:
1619 case R_X86_64_GOTTPOFF:
1620 if (bfd_link_executable (info))
1621 {
1622 if (h == NULL)
1623 to_type = R_X86_64_TPOFF32;
1624 else
1625 to_type = R_X86_64_GOTTPOFF;
1626 }
1627
1628 /* When we are called from elf_x86_64_relocate_section, there may
1629 be additional transitions based on TLS_TYPE. */
1630 if (from_relocate_section)
1631 {
1632 unsigned int new_to_type = to_type;
1633
1634 if (bfd_link_executable (info)
1635 && h != NULL
1636 && h->dynindx == -1
1637 && tls_type == GOT_TLS_IE)
1638 new_to_type = R_X86_64_TPOFF32;
1639
1640 if (to_type == R_X86_64_TLSGD
1641 || to_type == R_X86_64_GOTPC32_TLSDESC
1642 || to_type == R_X86_64_TLSDESC_CALL)
1643 {
1644 if (tls_type == GOT_TLS_IE)
1645 new_to_type = R_X86_64_GOTTPOFF;
1646 }
1647
1648 /* We checked the transition before when we were called from
1649 elf_x86_64_check_relocs. We only want to check the new
1650 transition which hasn't been checked before. */
1651 check = new_to_type != to_type && from_type == to_type;
1652 to_type = new_to_type;
1653 }
1654
1655 break;
1656
1657 case R_X86_64_TLSLD:
1658 if (bfd_link_executable (info))
1659 to_type = R_X86_64_TPOFF32;
1660 break;
1661
1662 default:
1663 return TRUE;
1664 }
1665
1666 /* Return TRUE if there is no transition. */
1667 if (from_type == to_type)
1668 return TRUE;
1669
1670 /* Check if the transition can be performed. */
1671 if (check
1672 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1673 symtab_hdr, sym_hashes,
1674 from_type, rel, relend))
1675 {
1676 reloc_howto_type *from, *to;
1677 const char *name;
1678
1679 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1680 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1681
1682 if (h)
1683 name = h->root.root.string;
1684 else
1685 {
1686 struct elf_x86_64_link_hash_table *htab;
1687
1688 htab = elf_x86_64_hash_table (info);
1689 if (htab == NULL)
1690 name = "*unknown*";
1691 else
1692 {
1693 Elf_Internal_Sym *isym;
1694
1695 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1696 abfd, r_symndx);
1697 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1698 }
1699 }
1700
1701 _bfd_error_handler
1702 /* xgettext:c-format */
1703 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1704 "in section `%A' failed"),
1705 abfd, from->name, to->name, name,
1706 (unsigned long) rel->r_offset, sec);
1707 bfd_set_error (bfd_error_bad_value);
1708 return FALSE;
1709 }
1710
1711 *r_type = to_type;
1712 return TRUE;
1713}
1714
1715/* Rename some of the generic section flags to better document how they
1716 are used here. */
1717#define need_convert_load sec_flg0
1718#define check_relocs_failed sec_flg1
1719
1720static bfd_boolean
1721elf_x86_64_need_pic (bfd *input_bfd, asection *sec,
1722 struct elf_link_hash_entry *h,
1723 Elf_Internal_Shdr *symtab_hdr,
1724 Elf_Internal_Sym *isym,
1725 reloc_howto_type *howto)
1726{
1727 const char *v = "";
1728 const char *und = "";
1729 const char *pic = "";
1730
1731 const char *name;
1732 if (h)
1733 {
1734 name = h->root.root.string;
1735 switch (ELF_ST_VISIBILITY (h->other))
1736 {
1737 case STV_HIDDEN:
1738 v = _("hidden symbol ");
1739 break;
1740 case STV_INTERNAL:
1741 v = _("internal symbol ");
1742 break;
1743 case STV_PROTECTED:
1744 v = _("protected symbol ");
1745 break;
1746 default:
1747 v = _("symbol ");
1748 pic = _("; recompile with -fPIC");
1749 break;
1750 }
1751
1752 if (!h->def_regular && !h->def_dynamic)
1753 und = _("undefined ");
1754 }
1755 else
1756 {
1757 name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL);
1758 pic = _("; recompile with -fPIC");
1759 }
1760
1761 /* xgettext:c-format */
1762 _bfd_error_handler (_("%B: relocation %s against %s%s`%s' can "
1763 "not be used when making a shared object%s"),
1764 input_bfd, howto->name, und, v, name, pic);
1765 bfd_set_error (bfd_error_bad_value);
1766 sec->check_relocs_failed = 1;
1767 return FALSE;
1768}
1769
1770/* With the local symbol, foo, we convert
1771 mov foo@GOTPCREL(%rip), %reg
1772 to
1773 lea foo(%rip), %reg
1774 and convert
1775 call/jmp *foo@GOTPCREL(%rip)
1776 to
1777 nop call foo/jmp foo nop
1778 When PIC is false, convert
1779 test %reg, foo@GOTPCREL(%rip)
1780 to
1781 test $foo, %reg
1782 and convert
1783 binop foo@GOTPCREL(%rip), %reg
1784 to
1785 binop $foo, %reg
1786 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1787 instructions. */
1788
1789static bfd_boolean
1790elf_x86_64_convert_load_reloc (bfd *abfd, asection *sec,
1791 bfd_byte *contents,
1792 Elf_Internal_Rela *irel,
1793 struct elf_link_hash_entry *h,
1794 bfd_boolean *converted,
1795 struct bfd_link_info *link_info)
1796{
1797 struct elf_x86_64_link_hash_table *htab;
1798 bfd_boolean is_pic;
1799 bfd_boolean require_reloc_pc32;
1800 bfd_boolean relocx;
1801 bfd_boolean to_reloc_pc32;
1802 asection *tsec;
1803 char symtype;
1804 bfd_signed_vma raddend;
1805 unsigned int opcode;
1806 unsigned int modrm;
1807 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
1808 unsigned int r_symndx;
1809 bfd_vma toff;
1810 bfd_vma roff = irel->r_offset;
1811
1812 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
1813 return TRUE;
1814
1815 raddend = irel->r_addend;
1816 /* Addend for 32-bit PC-relative relocation must be -4. */
1817 if (raddend != -4)
1818 return TRUE;
1819
1820 htab = elf_x86_64_hash_table (link_info);
1821 is_pic = bfd_link_pic (link_info);
1822
1823 relocx = (r_type == R_X86_64_GOTPCRELX
1824 || r_type == R_X86_64_REX_GOTPCRELX);
1825
1826 /* TRUE if we can convert only to R_X86_64_PC32. Enable it for
1827 --no-relax. */
1828 require_reloc_pc32
1829 = link_info->disable_target_specific_optimizations > 1;
1830
1831 r_symndx = htab->r_sym (irel->r_info);
1832
1833 opcode = bfd_get_8 (abfd, contents + roff - 2);
1834
1835 /* Convert mov to lea since it has been done for a while. */
1836 if (opcode != 0x8b)
1837 {
1838 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
1839 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
1840 test, xor instructions. */
1841 if (!relocx)
1842 return TRUE;
1843 }
1844
1845 /* We convert only to R_X86_64_PC32:
1846 1. Branch.
1847 2. R_X86_64_GOTPCREL since we can't modify REX byte.
1848 3. require_reloc_pc32 is true.
1849 4. PIC.
1850 */
1851 to_reloc_pc32 = (opcode == 0xff
1852 || !relocx
1853 || require_reloc_pc32
1854 || is_pic);
1855
1856 /* Get the symbol referred to by the reloc. */
1857 if (h == NULL)
1858 {
1859 Elf_Internal_Sym *isym
1860 = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx);
1861
1862 /* Skip relocation against undefined symbols. */
1863 if (isym->st_shndx == SHN_UNDEF)
1864 return TRUE;
1865
1866 symtype = ELF_ST_TYPE (isym->st_info);
1867
1868 if (isym->st_shndx == SHN_ABS)
1869 tsec = bfd_abs_section_ptr;
1870 else if (isym->st_shndx == SHN_COMMON)
1871 tsec = bfd_com_section_ptr;
1872 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
1873 tsec = &_bfd_elf_large_com_section;
1874 else
1875 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1876
1877 toff = isym->st_value;
1878 }
1879 else
1880 {
1881 /* Undefined weak symbol is only bound locally in executable
1882 and its reference is resolved as 0 without relocation
1883 overflow. We can only perform this optimization for
1884 GOTPCRELX relocations since we need to modify REX byte.
1885 It is OK convert mov with R_X86_64_GOTPCREL to
1886 R_X86_64_PC32. */
1887 if ((relocx || opcode == 0x8b)
1888 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info,
1889 TRUE,
1890 elf_x86_64_hash_entry (h)))
1891 {
1892 if (opcode == 0xff)
1893 {
1894 /* Skip for branch instructions since R_X86_64_PC32
1895 may overflow. */
1896 if (require_reloc_pc32)
1897 return TRUE;
1898 }
1899 else if (relocx)
1900 {
1901 /* For non-branch instructions, we can convert to
1902 R_X86_64_32/R_X86_64_32S since we know if there
1903 is a REX byte. */
1904 to_reloc_pc32 = FALSE;
1905 }
1906
1907 /* Since we don't know the current PC when PIC is true,
1908 we can't convert to R_X86_64_PC32. */
1909 if (to_reloc_pc32 && is_pic)
1910 return TRUE;
1911
1912 goto convert;
1913 }
1914 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
1915 ld.so may use its link-time address. */
1916 else if ((h->def_regular
1917 || h->root.type == bfd_link_hash_defined
1918 || h->root.type == bfd_link_hash_defweak)
1919 && h != htab->elf.hdynamic
1920 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1921 {
1922 /* bfd_link_hash_new or bfd_link_hash_undefined is
1923 set by an assignment in a linker script in
1924 bfd_elf_record_link_assignment. */
1925 if (h->def_regular
1926 && (h->root.type == bfd_link_hash_new
1927 || h->root.type == bfd_link_hash_undefined
1928 || ((h->root.type == bfd_link_hash_defined
1929 || h->root.type == bfd_link_hash_defweak)
1930 && h->root.u.def.section == bfd_und_section_ptr)))
1931 {
1932 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
1933 if (require_reloc_pc32)
1934 return TRUE;
1935 goto convert;
1936 }
1937 tsec = h->root.u.def.section;
1938 toff = h->root.u.def.value;
1939 symtype = h->type;
1940 }
1941 else
1942 return TRUE;
1943 }
1944
1945 /* Don't convert GOTPCREL relocation against large section. */
1946 if (elf_section_data (tsec) != NULL
1947 && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0)
1948 return TRUE;
1949
1950 /* We can only estimate relocation overflow for R_X86_64_PC32. */
1951 if (!to_reloc_pc32)
1952 goto convert;
1953
1954 if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
1955 {
1956 /* At this stage in linking, no SEC_MERGE symbol has been
1957 adjusted, so all references to such symbols need to be
1958 passed through _bfd_merged_section_offset. (Later, in
1959 relocate_section, all SEC_MERGE symbols *except* for
1960 section symbols have been adjusted.)
1961
1962 gas may reduce relocations against symbols in SEC_MERGE
1963 sections to a relocation against the section symbol when
1964 the original addend was zero. When the reloc is against
1965 a section symbol we should include the addend in the
1966 offset passed to _bfd_merged_section_offset, since the
1967 location of interest is the original symbol. On the
1968 other hand, an access to "sym+addend" where "sym" is not
1969 a section symbol should not include the addend; Such an
1970 access is presumed to be an offset from "sym"; The
1971 location of interest is just "sym". */
1972 if (symtype == STT_SECTION)
1973 toff += raddend;
1974
1975 toff = _bfd_merged_section_offset (abfd, &tsec,
1976 elf_section_data (tsec)->sec_info,
1977 toff);
1978
1979 if (symtype != STT_SECTION)
1980 toff += raddend;
1981 }
1982 else
1983 toff += raddend;
1984
1985 /* Don't convert if R_X86_64_PC32 relocation overflows. */
1986 if (tsec->output_section == sec->output_section)
1987 {
1988 if ((toff - roff + 0x80000000) > 0xffffffff)
1989 return TRUE;
1990 }
1991 else
1992 {
1993 bfd_signed_vma distance;
1994
1995 /* At this point, we don't know the load addresses of TSEC
1996 section nor SEC section. We estimate the distrance between
1997 SEC and TSEC. We store the estimated distances in the
1998 compressed_size field of the output section, which is only
1999 used to decompress the compressed input section. */
2000 if (sec->output_section->compressed_size == 0)
2001 {
2002 asection *asect;
2003 bfd_size_type size = 0;
2004 for (asect = link_info->output_bfd->sections;
2005 asect != NULL;
2006 asect = asect->next)
2007 /* Skip debug sections since compressed_size is used to
2008 compress debug sections. */
2009 if ((asect->flags & SEC_DEBUGGING) == 0)
2010 {
2011 asection *i;
2012 for (i = asect->map_head.s;
2013 i != NULL;
2014 i = i->map_head.s)
2015 {
2016 size = align_power (size, i->alignment_power);
2017 size += i->size;
2018 }
2019 asect->compressed_size = size;
2020 }
2021 }
2022
2023 /* Don't convert GOTPCREL relocations if TSEC isn't placed
2024 after SEC. */
2025 distance = (tsec->output_section->compressed_size
2026 - sec->output_section->compressed_size);
2027 if (distance < 0)
2028 return TRUE;
2029
2030 /* Take PT_GNU_RELRO segment into account by adding
2031 maxpagesize. */
2032 if ((toff + distance + get_elf_backend_data (abfd)->maxpagesize
2033 - roff + 0x80000000) > 0xffffffff)
2034 return TRUE;
2035 }
2036
2037convert:
2038 if (opcode == 0xff)
2039 {
2040 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
2041 unsigned int nop;
2042 unsigned int disp;
2043 bfd_vma nop_offset;
2044
2045 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
2046 R_X86_64_PC32. */
2047 modrm = bfd_get_8 (abfd, contents + roff - 1);
2048 if (modrm == 0x25)
2049 {
2050 /* Convert to "jmp foo nop". */
2051 modrm = 0xe9;
2052 nop = NOP_OPCODE;
2053 nop_offset = irel->r_offset + 3;
2054 disp = bfd_get_32 (abfd, contents + irel->r_offset);
2055 irel->r_offset -= 1;
2056 bfd_put_32 (abfd, disp, contents + irel->r_offset);
2057 }
2058 else
2059 {
2060 struct elf_x86_64_link_hash_entry *eh
2061 = (struct elf_x86_64_link_hash_entry *) h;
2062
2063 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
2064 is a nop prefix. */
2065 modrm = 0xe8;
2066 /* To support TLS optimization, always use addr32 prefix for
2067 "call *__tls_get_addr@GOTPCREL(%rip)". */
2068 if (eh && eh->tls_get_addr == 1)
2069 {
2070 nop = 0x67;
2071 nop_offset = irel->r_offset - 2;
2072 }
2073 else
2074 {
2075 nop = link_info->call_nop_byte;
2076 if (link_info->call_nop_as_suffix)
2077 {
2078 nop_offset = irel->r_offset + 3;
2079 disp = bfd_get_32 (abfd, contents + irel->r_offset);
2080 irel->r_offset -= 1;
2081 bfd_put_32 (abfd, disp, contents + irel->r_offset);
2082 }
2083 else
2084 nop_offset = irel->r_offset - 2;
2085 }
2086 }
2087 bfd_put_8 (abfd, nop, contents + nop_offset);
2088 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
2089 r_type = R_X86_64_PC32;
2090 }
2091 else
2092 {
2093 unsigned int rex;
2094 unsigned int rex_mask = REX_R;
2095
2096 if (r_type == R_X86_64_REX_GOTPCRELX)
2097 rex = bfd_get_8 (abfd, contents + roff - 3);
2098 else
2099 rex = 0;
2100
2101 if (opcode == 0x8b)
2102 {
2103 if (to_reloc_pc32)
2104 {
2105 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
2106 "lea foo(%rip), %reg". */
2107 opcode = 0x8d;
2108 r_type = R_X86_64_PC32;
2109 }
2110 else
2111 {
2112 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
2113 "mov $foo, %reg". */
2114 opcode = 0xc7;
2115 modrm = bfd_get_8 (abfd, contents + roff - 1);
2116 modrm = 0xc0 | (modrm & 0x38) >> 3;
2117 if ((rex & REX_W) != 0
2118 && ABI_64_P (link_info->output_bfd))
2119 {
2120 /* Keep the REX_W bit in REX byte for LP64. */
2121 r_type = R_X86_64_32S;
2122 goto rewrite_modrm_rex;
2123 }
2124 else
2125 {
2126 /* If the REX_W bit in REX byte isn't needed,
2127 use R_X86_64_32 and clear the W bit to avoid
2128 sign-extend imm32 to imm64. */
2129 r_type = R_X86_64_32;
2130 /* Clear the W bit in REX byte. */
2131 rex_mask |= REX_W;
2132 goto rewrite_modrm_rex;
2133 }
2134 }
2135 }
2136 else
2137 {
2138 /* R_X86_64_PC32 isn't supported. */
2139 if (to_reloc_pc32)
2140 return TRUE;
2141
2142 modrm = bfd_get_8 (abfd, contents + roff - 1);
2143 if (opcode == 0x85)
2144 {
2145 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
2146 "test $foo, %reg". */
2147 modrm = 0xc0 | (modrm & 0x38) >> 3;
2148 opcode = 0xf7;
2149 }
2150 else
2151 {
2152 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
2153 "binop $foo, %reg". */
2154 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
2155 opcode = 0x81;
2156 }
2157
2158 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
2159 overflow when sign-extending imm32 to imm64. */
2160 r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32;
2161
2162rewrite_modrm_rex:
2163 bfd_put_8 (abfd, modrm, contents + roff - 1);
2164
2165 if (rex)
2166 {
2167 /* Move the R bit to the B bit in REX byte. */
2168 rex = (rex & ~rex_mask) | (rex & REX_R) >> 2;
2169 bfd_put_8 (abfd, rex, contents + roff - 3);
2170 }
2171
2172 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
2173 irel->r_addend = 0;
2174 }
2175
2176 bfd_put_8 (abfd, opcode, contents + roff - 2);
2177 }
2178
2179 irel->r_info = htab->r_info (r_symndx, r_type);
2180
2181 *converted = TRUE;
2182
2183 return TRUE;
2184}
2185
2186/* Look through the relocs for a section during the first phase, and
2187 calculate needed space in the global offset table, procedure
2188 linkage table, and dynamic reloc sections. */
2189
2190static bfd_boolean
2191elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
2192 asection *sec,
2193 const Elf_Internal_Rela *relocs)
2194{
2195 struct elf_x86_64_link_hash_table *htab;
2196 Elf_Internal_Shdr *symtab_hdr;
2197 struct elf_link_hash_entry **sym_hashes;
2198 const Elf_Internal_Rela *rel;
2199 const Elf_Internal_Rela *rel_end;
2200 asection *sreloc;
2201 bfd_byte *contents;
2202 bfd_boolean use_plt_got;
2203
2204 if (bfd_link_relocatable (info))
2205 return TRUE;
2206
2207 /* Don't do anything special with non-loaded, non-alloced sections.
2208 In particular, any relocs in such sections should not affect GOT
2209 and PLT reference counting (ie. we don't allow them to create GOT
2210 or PLT entries), there's no possibility or desire to optimize TLS
2211 relocs, and there's not much point in propagating relocs to shared
2212 libs that the dynamic linker won't relocate. */
2213 if ((sec->flags & SEC_ALLOC) == 0)
2214 return TRUE;
2215
2216 BFD_ASSERT (is_x86_64_elf (abfd));
2217
2218 htab = elf_x86_64_hash_table (info);
2219 if (htab == NULL)
2220 {
2221 sec->check_relocs_failed = 1;
2222 return FALSE;
2223 }
2224
2225 /* Get the section contents. */
2226 if (elf_section_data (sec)->this_hdr.contents != NULL)
2227 contents = elf_section_data (sec)->this_hdr.contents;
2228 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2229 {
2230 sec->check_relocs_failed = 1;
2231 return FALSE;
2232 }
2233
2234 use_plt_got = get_elf_x86_64_backend_data (abfd) == &elf_x86_64_arch_bed;
2235
2236 symtab_hdr = &elf_symtab_hdr (abfd);
2237 sym_hashes = elf_sym_hashes (abfd);
2238
2239 sreloc = NULL;
2240
2241 rel_end = relocs + sec->reloc_count;
2242 for (rel = relocs; rel < rel_end; rel++)
2243 {
2244 unsigned int r_type;
2245 unsigned long r_symndx;
2246 struct elf_link_hash_entry *h;
2247 struct elf_x86_64_link_hash_entry *eh;
2248 Elf_Internal_Sym *isym;
2249 const char *name;
2250 bfd_boolean size_reloc;
2251
2252 r_symndx = htab->r_sym (rel->r_info);
2253 r_type = ELF32_R_TYPE (rel->r_info);
2254
2255 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
2256 {
2257 /* xgettext:c-format */
2258 _bfd_error_handler (_("%B: bad symbol index: %d"),
2259 abfd, r_symndx);
2260 goto error_return;
2261 }
2262
2263 if (r_symndx < symtab_hdr->sh_info)
2264 {
2265 /* A local symbol. */
2266 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2267 abfd, r_symndx);
2268 if (isym == NULL)
2269 goto error_return;
2270
2271 /* Check relocation against local STT_GNU_IFUNC symbol. */
2272 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2273 {
2274 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
2275 TRUE);
2276 if (h == NULL)
2277 goto error_return;
2278
2279 /* Fake a STT_GNU_IFUNC symbol. */
2280 h->type = STT_GNU_IFUNC;
2281 h->def_regular = 1;
2282 h->ref_regular = 1;
2283 h->forced_local = 1;
2284 h->root.type = bfd_link_hash_defined;
2285 }
2286 else
2287 h = NULL;
2288 }
2289 else
2290 {
2291 isym = NULL;
2292 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2293 while (h->root.type == bfd_link_hash_indirect
2294 || h->root.type == bfd_link_hash_warning)
2295 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2296 }
2297
2298 /* Check invalid x32 relocations. */
2299 if (!ABI_64_P (abfd))
2300 switch (r_type)
2301 {
2302 default:
2303 break;
2304
2305 case R_X86_64_DTPOFF64:
2306 case R_X86_64_TPOFF64:
2307 case R_X86_64_PC64:
2308 case R_X86_64_GOTOFF64:
2309 case R_X86_64_GOT64:
2310 case R_X86_64_GOTPCREL64:
2311 case R_X86_64_GOTPC64:
2312 case R_X86_64_GOTPLT64:
2313 case R_X86_64_PLTOFF64:
2314 {
2315 if (h)
2316 name = h->root.root.string;
2317 else
2318 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2319 NULL);
2320 _bfd_error_handler
2321 /* xgettext:c-format */
2322 (_("%B: relocation %s against symbol `%s' isn't "
2323 "supported in x32 mode"), abfd,
2324 x86_64_elf_howto_table[r_type].name, name);
2325 bfd_set_error (bfd_error_bad_value);
2326 goto error_return;
2327 }
2328 break;
2329 }
2330
2331 if (h != NULL)
2332 {
2333 switch (r_type)
2334 {
2335 default:
2336 break;
2337
2338 case R_X86_64_PC32_BND:
2339 case R_X86_64_PLT32_BND:
2340 case R_X86_64_PC32:
2341 case R_X86_64_PLT32:
2342 case R_X86_64_32:
2343 case R_X86_64_64:
2344 /* MPX PLT is supported only if elf_x86_64_arch_bed
2345 is used in 64-bit mode. */
2346 if (ABI_64_P (abfd)
2347 && info->bndplt
2348 && (get_elf_x86_64_backend_data (abfd)
2349 == &elf_x86_64_arch_bed))
2350 {
2351 elf_x86_64_hash_entry (h)->has_bnd_reloc = 1;
2352
2353 /* Create the second PLT for Intel MPX support. */
2354 if (htab->plt_bnd == NULL)
2355 {
2356 const struct elf_backend_data *bed;
2357
2358 bed = get_elf_backend_data (info->output_bfd);
2359 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry) == 8
2360 && (sizeof (elf_x86_64_bnd_plt2_entry)
2361 == sizeof (elf_x86_64_legacy_plt2_entry)));
2362
2363 if (htab->elf.dynobj == NULL)
2364 htab->elf.dynobj = abfd;
2365 htab->plt_bnd
2366 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2367 ".plt.bnd",
2368 (bed->dynamic_sec_flags
2369 | SEC_ALLOC
2370 | SEC_CODE
2371 | SEC_LOAD
2372 | SEC_READONLY));
2373 if (htab->plt_bnd == NULL
2374 || !bfd_set_section_alignment (htab->elf.dynobj,
2375 htab->plt_bnd,
2376 3))
2377 goto error_return;
2378 }
2379
2380 if (!info->no_ld_generated_unwind_info
2381 && htab->plt_bnd_eh_frame == NULL)
2382 {
2383 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
2384 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2385 | SEC_LINKER_CREATED);
2386 htab->plt_bnd_eh_frame
2387 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2388 ".eh_frame",
2389 flags);
2390 if (htab->plt_bnd_eh_frame == NULL
2391 || !bfd_set_section_alignment (htab->elf.dynobj,
2392 htab->plt_bnd_eh_frame,
2393 3))
2394 goto error_return;
2395 }
2396 }
2397 /* Fall through. */
2398
2399 case R_X86_64_32S:
2400 case R_X86_64_PC64:
2401 case R_X86_64_GOTPCREL:
2402 case R_X86_64_GOTPCRELX:
2403 case R_X86_64_REX_GOTPCRELX:
2404 case R_X86_64_GOTPCREL64:
2405 if (htab->elf.dynobj == NULL)
2406 htab->elf.dynobj = abfd;
2407 /* Create the ifunc sections for static executables. */
2408 if (h->type == STT_GNU_IFUNC
2409 && !_bfd_elf_create_ifunc_sections (htab->elf.dynobj,
2410 info))
2411 goto error_return;
2412 break;
2413 }
2414
2415 /* It is referenced by a non-shared object. */
2416 h->ref_regular = 1;
2417 h->root.non_ir_ref = 1;
2418
2419 if (h->type == STT_GNU_IFUNC)
2420 elf_tdata (info->output_bfd)->has_gnu_symbols
2421 |= elf_gnu_symbol_ifunc;
2422 }
2423
2424 if (! elf_x86_64_tls_transition (info, abfd, sec, contents,
2425 symtab_hdr, sym_hashes,
2426 &r_type, GOT_UNKNOWN,
2427 rel, rel_end, h, r_symndx, FALSE))
2428 goto error_return;
2429
2430 eh = (struct elf_x86_64_link_hash_entry *) h;
2431 switch (r_type)
2432 {
2433 case R_X86_64_TLSLD:
2434 htab->tls_ld_got.refcount += 1;
2435 goto create_got;
2436
2437 case R_X86_64_TPOFF32:
2438 if (!bfd_link_executable (info) && ABI_64_P (abfd))
2439 return elf_x86_64_need_pic (abfd, sec, h, symtab_hdr, isym,
2440 &x86_64_elf_howto_table[r_type]);
2441 if (eh != NULL)
2442 eh->has_got_reloc = 1;
2443 break;
2444
2445 case R_X86_64_GOTTPOFF:
2446 if (!bfd_link_executable (info))
2447 info->flags |= DF_STATIC_TLS;
2448 /* Fall through */
2449
2450 case R_X86_64_GOT32:
2451 case R_X86_64_GOTPCREL:
2452 case R_X86_64_GOTPCRELX:
2453 case R_X86_64_REX_GOTPCRELX:
2454 case R_X86_64_TLSGD:
2455 case R_X86_64_GOT64:
2456 case R_X86_64_GOTPCREL64:
2457 case R_X86_64_GOTPLT64:
2458 case R_X86_64_GOTPC32_TLSDESC:
2459 case R_X86_64_TLSDESC_CALL:
2460 /* This symbol requires a global offset table entry. */
2461 {
2462 int tls_type, old_tls_type;
2463
2464 switch (r_type)
2465 {
2466 default: tls_type = GOT_NORMAL; break;
2467 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
2468 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
2469 case R_X86_64_GOTPC32_TLSDESC:
2470 case R_X86_64_TLSDESC_CALL:
2471 tls_type = GOT_TLS_GDESC; break;
2472 }
2473
2474 if (h != NULL)
2475 {
2476 h->got.refcount += 1;
2477 old_tls_type = eh->tls_type;
2478 }
2479 else
2480 {
2481 bfd_signed_vma *local_got_refcounts;
2482
2483 /* This is a global offset table entry for a local symbol. */
2484 local_got_refcounts = elf_local_got_refcounts (abfd);
2485 if (local_got_refcounts == NULL)
2486 {
2487 bfd_size_type size;
2488
2489 size = symtab_hdr->sh_info;
2490 size *= sizeof (bfd_signed_vma)
2491 + sizeof (bfd_vma) + sizeof (char);
2492 local_got_refcounts = ((bfd_signed_vma *)
2493 bfd_zalloc (abfd, size));
2494 if (local_got_refcounts == NULL)
2495 goto error_return;
2496 elf_local_got_refcounts (abfd) = local_got_refcounts;
2497 elf_x86_64_local_tlsdesc_gotent (abfd)
2498 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2499 elf_x86_64_local_got_tls_type (abfd)
2500 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2501 }
2502 local_got_refcounts[r_symndx] += 1;
2503 old_tls_type
2504 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
2505 }
2506
2507 /* If a TLS symbol is accessed using IE at least once,
2508 there is no point to use dynamic model for it. */
2509 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2510 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2511 || tls_type != GOT_TLS_IE))
2512 {
2513 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
2514 tls_type = old_tls_type;
2515 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2516 && GOT_TLS_GD_ANY_P (tls_type))
2517 tls_type |= old_tls_type;
2518 else
2519 {
2520 if (h)
2521 name = h->root.root.string;
2522 else
2523 name = bfd_elf_sym_name (abfd, symtab_hdr,
2524 isym, NULL);
2525 _bfd_error_handler
2526 /* xgettext:c-format */
2527 (_("%B: '%s' accessed both as normal and thread local symbol"),
2528 abfd, name);
2529 bfd_set_error (bfd_error_bad_value);
2530 goto error_return;
2531 }
2532 }
2533
2534 if (old_tls_type != tls_type)
2535 {
2536 if (eh != NULL)
2537 eh->tls_type = tls_type;
2538 else
2539 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
2540 }
2541 }
2542 /* Fall through */
2543
2544 case R_X86_64_GOTOFF64:
2545 case R_X86_64_GOTPC32:
2546 case R_X86_64_GOTPC64:
2547 create_got:
2548 if (eh != NULL)
2549 eh->has_got_reloc = 1;
2550 if (htab->elf.sgot == NULL)
2551 {
2552 if (htab->elf.dynobj == NULL)
2553 htab->elf.dynobj = abfd;
2554 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
2555 info))
2556 goto error_return;
2557 }
2558 break;
2559
2560 case R_X86_64_PLT32:
2561 case R_X86_64_PLT32_BND:
2562 /* This symbol requires a procedure linkage table entry. We
2563 actually build the entry in adjust_dynamic_symbol,
2564 because this might be a case of linking PIC code which is
2565 never referenced by a dynamic object, in which case we
2566 don't need to generate a procedure linkage table entry
2567 after all. */
2568
2569 /* If this is a local symbol, we resolve it directly without
2570 creating a procedure linkage table entry. */
2571 if (h == NULL)
2572 continue;
2573
2574 eh->has_got_reloc = 1;
2575 h->needs_plt = 1;
2576 h->plt.refcount += 1;
2577 break;
2578
2579 case R_X86_64_PLTOFF64:
2580 /* This tries to form the 'address' of a function relative
2581 to GOT. For global symbols we need a PLT entry. */
2582 if (h != NULL)
2583 {
2584 h->needs_plt = 1;
2585 h->plt.refcount += 1;
2586 }
2587 goto create_got;
2588
2589 case R_X86_64_SIZE32:
2590 case R_X86_64_SIZE64:
2591 size_reloc = TRUE;
2592 goto do_size;
2593
2594 case R_X86_64_32:
2595 if (!ABI_64_P (abfd))
2596 goto pointer;
2597 /* Fall through. */
2598 case R_X86_64_8:
2599 case R_X86_64_16:
2600 case R_X86_64_32S:
2601 /* Check relocation overflow as these relocs may lead to
2602 run-time relocation overflow. Don't error out for
2603 sections we don't care about, such as debug sections or
2604 when relocation overflow check is disabled. */
2605 if (!info->no_reloc_overflow_check
2606 && (bfd_link_pic (info)
2607 || (bfd_link_executable (info)
2608 && h != NULL
2609 && !h->def_regular
2610 && h->def_dynamic
2611 && (sec->flags & SEC_READONLY) == 0)))
2612 return elf_x86_64_need_pic (abfd, sec, h, symtab_hdr, isym,
2613 &x86_64_elf_howto_table[r_type]);
2614 /* Fall through. */
2615
2616 case R_X86_64_PC8:
2617 case R_X86_64_PC16:
2618 case R_X86_64_PC32:
2619 case R_X86_64_PC32_BND:
2620 case R_X86_64_PC64:
2621 case R_X86_64_64:
2622pointer:
2623 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2624 eh->has_non_got_reloc = 1;
2625 /* We are called after all symbols have been resolved. Only
2626 relocation against STT_GNU_IFUNC symbol must go through
2627 PLT. */
2628 if (h != NULL
2629 && (bfd_link_executable (info)
2630 || h->type == STT_GNU_IFUNC))
2631 {
2632 /* If this reloc is in a read-only section, we might
2633 need a copy reloc. We can't check reliably at this
2634 stage whether the section is read-only, as input
2635 sections have not yet been mapped to output sections.
2636 Tentatively set the flag for now, and correct in
2637 adjust_dynamic_symbol. */
2638 h->non_got_ref = 1;
2639
2640 /* We may need a .plt entry if the symbol is a function
2641 defined in a shared lib or is a STT_GNU_IFUNC function
2642 referenced from the code or read-only section. */
2643 if (!h->def_regular
2644 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2645 h->plt.refcount += 1;
2646
2647 if (r_type == R_X86_64_PC32)
2648 {
2649 /* Since something like ".long foo - ." may be used
2650 as pointer, make sure that PLT is used if foo is
2651 a function defined in a shared library. */
2652 if ((sec->flags & SEC_CODE) == 0)
2653 h->pointer_equality_needed = 1;
2654 }
2655 else if (r_type != R_X86_64_PC32_BND
2656 && r_type != R_X86_64_PC64)
2657 {
2658 h->pointer_equality_needed = 1;
2659 /* At run-time, R_X86_64_64 can be resolved for both
2660 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2661 can only be resolved for x32. */
2662 if ((sec->flags & SEC_READONLY) == 0
2663 && (r_type == R_X86_64_64
2664 || (!ABI_64_P (abfd)
2665 && (r_type == R_X86_64_32
2666 || r_type == R_X86_64_32S))))
2667 eh->func_pointer_refcount += 1;
2668 }
2669 }
2670
2671 size_reloc = FALSE;
2672do_size:
2673 /* If we are creating a shared library, and this is a reloc
2674 against a global symbol, or a non PC relative reloc
2675 against a local symbol, then we need to copy the reloc
2676 into the shared library. However, if we are linking with
2677 -Bsymbolic, we do not need to copy a reloc against a
2678 global symbol which is defined in an object we are
2679 including in the link (i.e., DEF_REGULAR is set). At
2680 this point we have not seen all the input files, so it is
2681 possible that DEF_REGULAR is not set now but will be set
2682 later (it is never cleared). In case of a weak definition,
2683 DEF_REGULAR may be cleared later by a strong definition in
2684 a shared library. We account for that possibility below by
2685 storing information in the relocs_copied field of the hash
2686 table entry. A similar situation occurs when creating
2687 shared libraries and symbol visibility changes render the
2688 symbol local.
2689
2690 If on the other hand, we are creating an executable, we
2691 may need to keep relocations for symbols satisfied by a
2692 dynamic library if we manage to avoid copy relocs for the
2693 symbol.
2694
2695 Generate dynamic pointer relocation against STT_GNU_IFUNC
2696 symbol in the non-code section. */
2697 if ((bfd_link_pic (info)
2698 && (! IS_X86_64_PCREL_TYPE (r_type)
2699 || (h != NULL
2700 && (! (bfd_link_pie (info)
2701 || SYMBOLIC_BIND (info, h))
2702 || h->root.type == bfd_link_hash_defweak
2703 || !h->def_regular))))
2704 || (h != NULL
2705 && h->type == STT_GNU_IFUNC
2706 && r_type == htab->pointer_r_type
2707 && (sec->flags & SEC_CODE) == 0)
2708 || (ELIMINATE_COPY_RELOCS
2709 && !bfd_link_pic (info)
2710 && h != NULL
2711 && (h->root.type == bfd_link_hash_defweak
2712 || !h->def_regular)))
2713 {
2714 struct elf_dyn_relocs *p;
2715 struct elf_dyn_relocs **head;
2716
2717 /* We must copy these reloc types into the output file.
2718 Create a reloc section in dynobj and make room for
2719 this reloc. */
2720 if (sreloc == NULL)
2721 {
2722 if (htab->elf.dynobj == NULL)
2723 htab->elf.dynobj = abfd;
2724
2725 sreloc = _bfd_elf_make_dynamic_reloc_section
2726 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2727 abfd, /*rela?*/ TRUE);
2728
2729 if (sreloc == NULL)
2730 goto error_return;
2731 }
2732
2733 /* If this is a global symbol, we count the number of
2734 relocations we need for this symbol. */
2735 if (h != NULL)
2736 head = &eh->dyn_relocs;
2737 else
2738 {
2739 /* Track dynamic relocs needed for local syms too.
2740 We really need local syms available to do this
2741 easily. Oh well. */
2742 asection *s;
2743 void **vpp;
2744
2745 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2746 abfd, r_symndx);
2747 if (isym == NULL)
2748 goto error_return;
2749
2750 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2751 if (s == NULL)
2752 s = sec;
2753
2754 /* Beware of type punned pointers vs strict aliasing
2755 rules. */
2756 vpp = &(elf_section_data (s)->local_dynrel);
2757 head = (struct elf_dyn_relocs **)vpp;
2758 }
2759
2760 p = *head;
2761 if (p == NULL || p->sec != sec)
2762 {
2763 bfd_size_type amt = sizeof *p;
2764
2765 p = ((struct elf_dyn_relocs *)
2766 bfd_alloc (htab->elf.dynobj, amt));
2767 if (p == NULL)
2768 goto error_return;
2769 p->next = *head;
2770 *head = p;
2771 p->sec = sec;
2772 p->count = 0;
2773 p->pc_count = 0;
2774 }
2775
2776 p->count += 1;
2777 /* Count size relocation as PC-relative relocation. */
2778 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2779 p->pc_count += 1;
2780 }
2781 break;
2782
2783 /* This relocation describes the C++ object vtable hierarchy.
2784 Reconstruct it for later use during GC. */
2785 case R_X86_64_GNU_VTINHERIT:
2786 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2787 goto error_return;
2788 break;
2789
2790 /* This relocation describes which C++ vtable entries are actually
2791 used. Record for later use during GC. */
2792 case R_X86_64_GNU_VTENTRY:
2793 BFD_ASSERT (h != NULL);
2794 if (h != NULL
2795 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2796 goto error_return;
2797 break;
2798
2799 default:
2800 break;
2801 }
2802
2803 if (use_plt_got
2804 && h != NULL
2805 && h->plt.refcount > 0
2806 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2807 || h->got.refcount > 0)
2808 && htab->plt_got == NULL)
2809 {
2810 /* Create the GOT procedure linkage table. */
2811 unsigned int plt_got_align;
2812 const struct elf_backend_data *bed;
2813
2814 bed = get_elf_backend_data (info->output_bfd);
2815 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry) == 8
2816 && (sizeof (elf_x86_64_bnd_plt2_entry)
2817 == sizeof (elf_x86_64_legacy_plt2_entry)));
2818 plt_got_align = 3;
2819
2820 if (htab->elf.dynobj == NULL)
2821 htab->elf.dynobj = abfd;
2822 htab->plt_got
2823 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2824 ".plt.got",
2825 (bed->dynamic_sec_flags
2826 | SEC_ALLOC
2827 | SEC_CODE
2828 | SEC_LOAD
2829 | SEC_READONLY));
2830 if (htab->plt_got == NULL
2831 || !bfd_set_section_alignment (htab->elf.dynobj,
2832 htab->plt_got,
2833 plt_got_align))
2834 goto error_return;
2835
2836 if (!info->no_ld_generated_unwind_info
2837 && htab->plt_got_eh_frame == NULL
2838 && get_elf_x86_64_backend_data (abfd)->eh_frame_plt_got != NULL)
2839 {
2840 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
2841 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2842 | SEC_LINKER_CREATED);
2843 htab->plt_got_eh_frame
2844 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2845 ".eh_frame",
2846 flags);
2847 if (htab->plt_got_eh_frame == NULL
2848 || !bfd_set_section_alignment (htab->elf.dynobj,
2849 htab->plt_got_eh_frame,
2850 ABI_64_P (htab->elf.dynobj) ? 3 : 2))
2851 goto error_return;
2852 }
2853 }
2854
2855 if ((r_type == R_X86_64_GOTPCREL
2856 || r_type == R_X86_64_GOTPCRELX
2857 || r_type == R_X86_64_REX_GOTPCRELX)
2858 && (h == NULL || h->type != STT_GNU_IFUNC))
2859 sec->need_convert_load = 1;
2860 }
2861
2862 if (elf_section_data (sec)->this_hdr.contents != contents)
2863 {
2864 if (!info->keep_memory)
2865 free (contents);
2866 else
2867 {
2868 /* Cache the section contents for elf_link_input_bfd. */
2869 elf_section_data (sec)->this_hdr.contents = contents;
2870 }
2871 }
2872
2873 return TRUE;
2874
2875error_return:
2876 if (elf_section_data (sec)->this_hdr.contents != contents)
2877 free (contents);
2878 sec->check_relocs_failed = 1;
2879 return FALSE;
2880}
2881
2882/* Return the section that should be marked against GC for a given
2883 relocation. */
2884
2885static asection *
2886elf_x86_64_gc_mark_hook (asection *sec,
2887 struct bfd_link_info *info,
2888 Elf_Internal_Rela *rel,
2889 struct elf_link_hash_entry *h,
2890 Elf_Internal_Sym *sym)
2891{
2892 if (h != NULL)
2893 switch (ELF32_R_TYPE (rel->r_info))
2894 {
2895 case R_X86_64_GNU_VTINHERIT:
2896 case R_X86_64_GNU_VTENTRY:
2897 return NULL;
2898 }
2899
2900 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2901}
2902
2903/* Remove undefined weak symbol from the dynamic symbol table if it
2904 is resolved to 0. */
2905
2906static bfd_boolean
2907elf_x86_64_fixup_symbol (struct bfd_link_info *info,
2908 struct elf_link_hash_entry *h)
2909{
2910 if (h->dynindx != -1
2911 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2912 elf_x86_64_hash_entry (h)->has_got_reloc,
2913 elf_x86_64_hash_entry (h)))
2914 {
2915 h->dynindx = -1;
2916 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2917 h->dynstr_index);
2918 }
2919 return TRUE;
2920}
2921
2922/* Adjust a symbol defined by a dynamic object and referenced by a
2923 regular object. The current definition is in some section of the
2924 dynamic object, but we're not including those sections. We have to
2925 change the definition to something the rest of the link can
2926 understand. */
2927
2928static bfd_boolean
2929elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2930 struct elf_link_hash_entry *h)
2931{
2932 struct elf_x86_64_link_hash_table *htab;
2933 asection *s, *srel;
2934 struct elf_x86_64_link_hash_entry *eh;
2935 struct elf_dyn_relocs *p;
2936
2937 /* STT_GNU_IFUNC symbol must go through PLT. */
2938 if (h->type == STT_GNU_IFUNC)
2939 {
2940 /* All local STT_GNU_IFUNC references must be treate as local
2941 calls via local PLT. */
2942 if (h->ref_regular
2943 && SYMBOL_CALLS_LOCAL (info, h))
2944 {
2945 bfd_size_type pc_count = 0, count = 0;
2946 struct elf_dyn_relocs **pp;
2947
2948 eh = (struct elf_x86_64_link_hash_entry *) h;
2949 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2950 {
2951 pc_count += p->pc_count;
2952 p->count -= p->pc_count;
2953 p->pc_count = 0;
2954 count += p->count;
2955 if (p->count == 0)
2956 *pp = p->next;
2957 else
2958 pp = &p->next;
2959 }
2960
2961 if (pc_count || count)
2962 {
2963 h->non_got_ref = 1;
2964 if (pc_count)
2965 {
2966 /* Increment PLT reference count only for PC-relative
2967 references. */
2968 h->needs_plt = 1;
2969 if (h->plt.refcount <= 0)
2970 h->plt.refcount = 1;
2971 else
2972 h->plt.refcount += 1;
2973 }
2974 }
2975 }
2976
2977 if (h->plt.refcount <= 0)
2978 {
2979 h->plt.offset = (bfd_vma) -1;
2980 h->needs_plt = 0;
2981 }
2982 return TRUE;
2983 }
2984
2985 /* If this is a function, put it in the procedure linkage table. We
2986 will fill in the contents of the procedure linkage table later,
2987 when we know the address of the .got section. */
2988 if (h->type == STT_FUNC
2989 || h->needs_plt)
2990 {
2991 if (h->plt.refcount <= 0
2992 || SYMBOL_CALLS_LOCAL (info, h)
2993 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2994 && h->root.type == bfd_link_hash_undefweak))
2995 {
2996 /* This case can occur if we saw a PLT32 reloc in an input
2997 file, but the symbol was never referred to by a dynamic
2998 object, or if all references were garbage collected. In
2999 such a case, we don't actually need to build a procedure
3000 linkage table, and we can just do a PC32 reloc instead. */
3001 h->plt.offset = (bfd_vma) -1;
3002 h->needs_plt = 0;
3003 }
3004
3005 return TRUE;
3006 }
3007 else
3008 /* It's possible that we incorrectly decided a .plt reloc was
3009 needed for an R_X86_64_PC32 reloc to a non-function sym in
3010 check_relocs. We can't decide accurately between function and
3011 non-function syms in check-relocs; Objects loaded later in
3012 the link may change h->type. So fix it now. */
3013 h->plt.offset = (bfd_vma) -1;
3014
3015 /* If this is a weak symbol, and there is a real definition, the
3016 processor independent code will have arranged for us to see the
3017 real definition first, and we can just use the same value. */
3018 if (h->u.weakdef != NULL)
3019 {
3020 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
3021 || h->u.weakdef->root.type == bfd_link_hash_defweak);
3022 h->root.u.def.section = h->u.weakdef->root.u.def.section;
3023 h->root.u.def.value = h->u.weakdef->root.u.def.value;
3024 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
3025 {
3026 eh = (struct elf_x86_64_link_hash_entry *) h;
3027 h->non_got_ref = h->u.weakdef->non_got_ref;
3028 eh->needs_copy = h->u.weakdef->needs_copy;
3029 }
3030 return TRUE;
3031 }
3032
3033 /* This is a reference to a symbol defined by a dynamic object which
3034 is not a function. */
3035
3036 /* If we are creating a shared library, we must presume that the
3037 only references to the symbol are via the global offset table.
3038 For such cases we need not do anything here; the relocations will
3039 be handled correctly by relocate_section. */
3040 if (!bfd_link_executable (info))
3041 return TRUE;
3042
3043 /* If there are no references to this symbol that do not use the
3044 GOT, we don't need to generate a copy reloc. */
3045 if (!h->non_got_ref)
3046 return TRUE;
3047
3048 /* If -z nocopyreloc was given, we won't generate them either. */
3049 if (info->nocopyreloc)
3050 {
3051 h->non_got_ref = 0;
3052 return TRUE;
3053 }
3054
3055 if (ELIMINATE_COPY_RELOCS)
3056 {
3057 eh = (struct elf_x86_64_link_hash_entry *) h;
3058 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3059 {
3060 s = p->sec->output_section;
3061 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3062 break;
3063 }
3064
3065 /* If we didn't find any dynamic relocs in read-only sections, then
3066 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
3067 if (p == NULL)
3068 {
3069 h->non_got_ref = 0;
3070 return TRUE;
3071 }
3072 }
3073
3074 /* We must allocate the symbol in our .dynbss section, which will
3075 become part of the .bss section of the executable. There will be
3076 an entry for this symbol in the .dynsym section. The dynamic
3077 object will contain position independent code, so all references
3078 from the dynamic object to this symbol will go through the global
3079 offset table. The dynamic linker will use the .dynsym entry to
3080 determine the address it must put in the global offset table, so
3081 both the dynamic object and the regular object will refer to the
3082 same memory location for the variable. */
3083
3084 htab = elf_x86_64_hash_table (info);
3085 if (htab == NULL)
3086 return FALSE;
3087
3088 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
3089 to copy the initial value out of the dynamic object and into the
3090 runtime process image. */
3091 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
3092 {
3093 s = htab->elf.sdynrelro;
3094 srel = htab->elf.sreldynrelro;
3095 }
3096 else
3097 {
3098 s = htab->elf.sdynbss;
3099 srel = htab->elf.srelbss;
3100 }
3101 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
3102 {
3103 const struct elf_backend_data *bed;
3104 bed = get_elf_backend_data (info->output_bfd);
3105 srel->size += bed->s->sizeof_rela;
3106 h->needs_copy = 1;
3107 }
3108
3109 return _bfd_elf_adjust_dynamic_copy (info, h, s);
3110}
3111
3112/* Allocate space in .plt, .got and associated reloc sections for
3113 dynamic relocs. */
3114
3115static bfd_boolean
3116elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
3117{
3118 struct bfd_link_info *info;
3119 struct elf_x86_64_link_hash_table *htab;
3120 struct elf_x86_64_link_hash_entry *eh;
3121 struct elf_dyn_relocs *p;
3122 const struct elf_backend_data *bed;
3123 unsigned int plt_entry_size;
3124 bfd_boolean resolved_to_zero;
3125
3126 if (h->root.type == bfd_link_hash_indirect)
3127 return TRUE;
3128
3129 eh = (struct elf_x86_64_link_hash_entry *) h;
3130
3131 info = (struct bfd_link_info *) inf;
3132 htab = elf_x86_64_hash_table (info);
3133 if (htab == NULL)
3134 return FALSE;
3135 bed = get_elf_backend_data (info->output_bfd);
3136 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3137
3138 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
3139 eh->has_got_reloc,
3140 eh);
3141
3142 /* We can't use the GOT PLT if pointer equality is needed since
3143 finish_dynamic_symbol won't clear symbol value and the dynamic
3144 linker won't update the GOT slot. We will get into an infinite
3145 loop at run-time. */
3146 if (htab->plt_got != NULL
3147 && h->type != STT_GNU_IFUNC
3148 && !h->pointer_equality_needed
3149 && h->plt.refcount > 0
3150 && h->got.refcount > 0)
3151 {
3152 /* Don't use the regular PLT if there are both GOT and GOTPLT
3153 reloctions. */
3154 h->plt.offset = (bfd_vma) -1;
3155
3156 /* Use the GOT PLT. */
3157 eh->plt_got.refcount = 1;
3158 }
3159
3160 /* Clear the reference count of function pointer relocations if
3161 symbol isn't a normal function. */
3162 if (h->type != STT_FUNC)
3163 eh->func_pointer_refcount = 0;
3164
3165 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
3166 here if it is defined and referenced in a non-shared object. */
3167 if (h->type == STT_GNU_IFUNC
3168 && h->def_regular)
3169 {
3170 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
3171 &eh->dyn_relocs,
3172 &htab->readonly_dynrelocs_against_ifunc,
3173 plt_entry_size,
3174 plt_entry_size,
3175 GOT_ENTRY_SIZE, TRUE))
3176 {
3177 asection *s = htab->plt_bnd;
3178 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
3179 {
3180 /* Use the .plt.bnd section if it is created. */
3181 eh->plt_bnd.offset = s->size;
3182
3183 /* Make room for this entry in the .plt.bnd section. */
3184 s->size += sizeof (elf_x86_64_legacy_plt2_entry);
3185 }
3186
3187 return TRUE;
3188 }
3189 else
3190 return FALSE;
3191 }
3192 /* Don't create the PLT entry if there are only function pointer
3193 relocations which can be resolved at run-time. */
3194 else if (htab->elf.dynamic_sections_created
3195 && (h->plt.refcount > eh->func_pointer_refcount
3196 || eh->plt_got.refcount > 0))
3197 {
3198 bfd_boolean use_plt_got;
3199
3200 /* Clear the reference count of function pointer relocations
3201 if PLT is used. */
3202 eh->func_pointer_refcount = 0;
3203
3204 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
3205 {
3206 /* Don't use the regular PLT for DF_BIND_NOW. */
3207 h->plt.offset = (bfd_vma) -1;
3208
3209 /* Use the GOT PLT. */
3210 h->got.refcount = 1;
3211 eh->plt_got.refcount = 1;
3212 }
3213
3214 use_plt_got = eh->plt_got.refcount > 0;
3215
3216 /* Make sure this symbol is output as a dynamic symbol.
3217 Undefined weak syms won't yet be marked as dynamic. */
3218 if (h->dynindx == -1
3219 && !h->forced_local
3220 && !resolved_to_zero)
3221 {
3222 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3223 return FALSE;
3224 }
3225
3226 if (bfd_link_pic (info)
3227 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
3228 {
3229 asection *s = htab->elf.splt;
3230 asection *bnd_s = htab->plt_bnd;
3231 asection *got_s = htab->plt_got;
3232
3233 /* If this is the first .plt entry, make room for the special
3234 first entry. The .plt section is used by prelink to undo
3235 prelinking for dynamic relocations. */
3236 if (s->size == 0)
3237 s->size = plt_entry_size;
3238
3239 if (use_plt_got)
3240 eh->plt_got.offset = got_s->size;
3241 else
3242 {
3243 h->plt.offset = s->size;
3244 if (bnd_s)
3245 eh->plt_bnd.offset = bnd_s->size;
3246 }
3247
3248 /* If this symbol is not defined in a regular file, and we are
3249 not generating a shared library, then set the symbol to this
3250 location in the .plt. This is required to make function
3251 pointers compare as equal between the normal executable and
3252 the shared library. */
3253 if (! bfd_link_pic (info)
3254 && !h->def_regular)
3255 {
3256 if (use_plt_got)
3257 {
3258 /* We need to make a call to the entry of the GOT PLT
3259 instead of regular PLT entry. */
3260 h->root.u.def.section = got_s;
3261 h->root.u.def.value = eh->plt_got.offset;
3262 }
3263 else
3264 {
3265 if (bnd_s)
3266 {
3267 /* We need to make a call to the entry of the second
3268 PLT instead of regular PLT entry. */
3269 h->root.u.def.section = bnd_s;
3270 h->root.u.def.value = eh->plt_bnd.offset;
3271 }
3272 else
3273 {
3274 h->root.u.def.section = s;
3275 h->root.u.def.value = h->plt.offset;
3276 }
3277 }
3278 }
3279
3280 /* Make room for this entry. */
3281 if (use_plt_got)
3282 got_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
3283 else
3284 {
3285 s->size += plt_entry_size;
3286 if (bnd_s)
3287 bnd_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
3288
3289 /* We also need to make an entry in the .got.plt section,
3290 which will be placed in the .got section by the linker
3291 script. */
3292 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
3293
3294 /* There should be no PLT relocation against resolved
3295 undefined weak symbol in executable. */
3296 if (!resolved_to_zero)
3297 {
3298 /* We also need to make an entry in the .rela.plt
3299 section. */
3300 htab->elf.srelplt->size += bed->s->sizeof_rela;
3301 htab->elf.srelplt->reloc_count++;
3302 }
3303 }
3304 }
3305 else
3306 {
3307 eh->plt_got.offset = (bfd_vma) -1;
3308 h->plt.offset = (bfd_vma) -1;
3309 h->needs_plt = 0;
3310 }
3311 }
3312 else
3313 {
3314 eh->plt_got.offset = (bfd_vma) -1;
3315 h->plt.offset = (bfd_vma) -1;
3316 h->needs_plt = 0;
3317 }
3318
3319 eh->tlsdesc_got = (bfd_vma) -1;
3320
3321 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
3322 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
3323 if (h->got.refcount > 0
3324 && bfd_link_executable (info)
3325 && h->dynindx == -1
3326 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
3327 {
3328 h->got.offset = (bfd_vma) -1;
3329 }
3330 else if (h->got.refcount > 0)
3331 {
3332 asection *s;
3333 bfd_boolean dyn;
3334 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
3335
3336 /* Make sure this symbol is output as a dynamic symbol.
3337 Undefined weak syms won't yet be marked as dynamic. */
3338 if (h->dynindx == -1
3339 && !h->forced_local
3340 && !resolved_to_zero)
3341 {
3342 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3343 return FALSE;
3344 }
3345
3346 if (GOT_TLS_GDESC_P (tls_type))
3347 {
3348 eh->tlsdesc_got = htab->elf.sgotplt->size
3349 - elf_x86_64_compute_jump_table_size (htab);
3350 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3351 h->got.offset = (bfd_vma) -2;
3352 }
3353 if (! GOT_TLS_GDESC_P (tls_type)
3354 || GOT_TLS_GD_P (tls_type))
3355 {
3356 s = htab->elf.sgot;
3357 h->got.offset = s->size;
3358 s->size += GOT_ENTRY_SIZE;
3359 if (GOT_TLS_GD_P (tls_type))
3360 s->size += GOT_ENTRY_SIZE;
3361 }
3362 dyn = htab->elf.dynamic_sections_created;
3363 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
3364 and two if global. R_X86_64_GOTTPOFF needs one dynamic
3365 relocation. No dynamic relocation against resolved undefined
3366 weak symbol in executable. */
3367 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
3368 || tls_type == GOT_TLS_IE)
3369 htab->elf.srelgot->size += bed->s->sizeof_rela;
3370 else if (GOT_TLS_GD_P (tls_type))
3371 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
3372 else if (! GOT_TLS_GDESC_P (tls_type)
3373 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3374 && !resolved_to_zero)
3375 || h->root.type != bfd_link_hash_undefweak)
3376 && (bfd_link_pic (info)
3377 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
3378 htab->elf.srelgot->size += bed->s->sizeof_rela;
3379 if (GOT_TLS_GDESC_P (tls_type))
3380 {
3381 htab->elf.srelplt->size += bed->s->sizeof_rela;
3382 htab->tlsdesc_plt = (bfd_vma) -1;
3383 }
3384 }
3385 else
3386 h->got.offset = (bfd_vma) -1;
3387
3388 if (eh->dyn_relocs == NULL)
3389 return TRUE;
3390
3391 /* In the shared -Bsymbolic case, discard space allocated for
3392 dynamic pc-relative relocs against symbols which turn out to be
3393 defined in regular objects. For the normal shared case, discard
3394 space for pc-relative relocs that have become local due to symbol
3395 visibility changes. */
3396
3397 if (bfd_link_pic (info))
3398 {
3399 /* Relocs that use pc_count are those that appear on a call
3400 insn, or certain REL relocs that can generated via assembly.
3401 We want calls to protected symbols to resolve directly to the
3402 function rather than going via the plt. If people want
3403 function pointer comparisons to work as expected then they
3404 should avoid writing weird assembly. */
3405 if (SYMBOL_CALLS_LOCAL (info, h))
3406 {
3407 struct elf_dyn_relocs **pp;
3408
3409 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
3410 {
3411 p->count -= p->pc_count;
3412 p->pc_count = 0;
3413 if (p->count == 0)
3414 *pp = p->next;
3415 else
3416 pp = &p->next;
3417 }
3418 }
3419
3420 /* Also discard relocs on undefined weak syms with non-default
3421 visibility or in PIE. */
3422 if (eh->dyn_relocs != NULL)
3423 {
3424 if (h->root.type == bfd_link_hash_undefweak)
3425 {
3426 /* Undefined weak symbol is never bound locally in shared
3427 library. */
3428 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
3429 || resolved_to_zero)
3430 eh->dyn_relocs = NULL;
3431 else if (h->dynindx == -1
3432 && ! h->forced_local
3433 && ! bfd_elf_link_record_dynamic_symbol (info, h))
3434 return FALSE;
3435 }
3436 /* For PIE, discard space for pc-relative relocs against
3437 symbols which turn out to need copy relocs. */
3438 else if (bfd_link_executable (info)
3439 && (h->needs_copy || eh->needs_copy)
3440 && h->def_dynamic
3441 && !h->def_regular)
3442 {
3443 struct elf_dyn_relocs **pp;
3444
3445 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
3446 {
3447 if (p->pc_count != 0)
3448 *pp = p->next;
3449 else
3450 pp = &p->next;
3451 }
3452 }
3453 }
3454 }
3455 else if (ELIMINATE_COPY_RELOCS)
3456 {
3457 /* For the non-shared case, discard space for relocs against
3458 symbols which turn out to need copy relocs or are not
3459 dynamic. Keep dynamic relocations for run-time function
3460 pointer initialization. */
3461
3462 if ((!h->non_got_ref
3463 || eh->func_pointer_refcount > 0
3464 || (h->root.type == bfd_link_hash_undefweak
3465 && !resolved_to_zero))
3466 && ((h->def_dynamic
3467 && !h->def_regular)
3468 || (htab->elf.dynamic_sections_created
3469 && (h->root.type == bfd_link_hash_undefweak
3470 || h->root.type == bfd_link_hash_undefined))))
3471 {
3472 /* Make sure this symbol is output as a dynamic symbol.
3473 Undefined weak syms won't yet be marked as dynamic. */
3474 if (h->dynindx == -1
3475 && ! h->forced_local
3476 && ! resolved_to_zero
3477 && ! bfd_elf_link_record_dynamic_symbol (info, h))
3478 return FALSE;
3479
3480 /* If that succeeded, we know we'll be keeping all the
3481 relocs. */
3482 if (h->dynindx != -1)
3483 goto keep;
3484 }
3485
3486 eh->dyn_relocs = NULL;
3487 eh->func_pointer_refcount = 0;
3488
3489 keep: ;
3490 }
3491
3492 /* Finally, allocate space. */
3493 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3494 {
3495 asection * sreloc;
3496
3497 sreloc = elf_section_data (p->sec)->sreloc;
3498
3499 BFD_ASSERT (sreloc != NULL);
3500
3501 sreloc->size += p->count * bed->s->sizeof_rela;
3502 }
3503
3504 return TRUE;
3505}
3506
3507/* Allocate space in .plt, .got and associated reloc sections for
3508 local dynamic relocs. */
3509
3510static bfd_boolean
3511elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
3512{
3513 struct elf_link_hash_entry *h
3514 = (struct elf_link_hash_entry *) *slot;
3515
3516 if (h->type != STT_GNU_IFUNC
3517 || !h->def_regular
3518 || !h->ref_regular
3519 || !h->forced_local
3520 || h->root.type != bfd_link_hash_defined)
3521 abort ();
3522
3523 return elf_x86_64_allocate_dynrelocs (h, inf);
3524}
3525
3526/* Find any dynamic relocs that apply to read-only sections. */
3527
3528static bfd_boolean
3529elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
3530 void * inf)
3531{
3532 struct elf_x86_64_link_hash_entry *eh;
3533 struct elf_dyn_relocs *p;
3534
3535 /* Skip local IFUNC symbols. */
3536 if (h->forced_local && h->type == STT_GNU_IFUNC)
3537 return TRUE;
3538
3539 eh = (struct elf_x86_64_link_hash_entry *) h;
3540 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3541 {
3542 asection *s = p->sec->output_section;
3543
3544 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3545 {
3546 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3547
3548 info->flags |= DF_TEXTREL;
3549
3550 if ((info->warn_shared_textrel && bfd_link_pic (info))
3551 || info->error_textrel)
3552 /* xgettext:c-format */
3553 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3554 p->sec->owner, h->root.root.string,
3555 p->sec);
3556
3557 /* Not an error, just cut short the traversal. */
3558 return FALSE;
3559 }
3560 }
3561 return TRUE;
3562}
3563
3564/* Convert load via the GOT slot to load immediate. */
3565
3566static bfd_boolean
3567elf_x86_64_convert_load (bfd *abfd, asection *sec,
3568 struct bfd_link_info *link_info)
3569{
3570 Elf_Internal_Shdr *symtab_hdr;
3571 Elf_Internal_Rela *internal_relocs;
3572 Elf_Internal_Rela *irel, *irelend;
3573 bfd_byte *contents;
3574 struct elf_x86_64_link_hash_table *htab;
3575 bfd_boolean changed;
3576 bfd_signed_vma *local_got_refcounts;
3577
3578 /* Don't even try to convert non-ELF outputs. */
3579 if (!is_elf_hash_table (link_info->hash))
3580 return FALSE;
3581
3582 /* Nothing to do if there is no need or no output. */
3583 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3584 || sec->need_convert_load == 0
3585 || bfd_is_abs_section (sec->output_section))
3586 return TRUE;
3587
3588 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3589
3590 /* Load the relocations for this section. */
3591 internal_relocs = (_bfd_elf_link_read_relocs
3592 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3593 link_info->keep_memory));
3594 if (internal_relocs == NULL)
3595 return FALSE;
3596
3597 changed = FALSE;
3598 htab = elf_x86_64_hash_table (link_info);
3599 local_got_refcounts = elf_local_got_refcounts (abfd);
3600
3601 /* Get the section contents. */
3602 if (elf_section_data (sec)->this_hdr.contents != NULL)
3603 contents = elf_section_data (sec)->this_hdr.contents;
3604 else
3605 {
3606 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3607 goto error_return;
3608 }
3609
3610 irelend = internal_relocs + sec->reloc_count;
3611 for (irel = internal_relocs; irel < irelend; irel++)
3612 {
3613 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3614 unsigned int r_symndx;
3615 struct elf_link_hash_entry *h;
3616 bfd_boolean converted;
3617
3618 if (r_type != R_X86_64_GOTPCRELX
3619 && r_type != R_X86_64_REX_GOTPCRELX
3620 && r_type != R_X86_64_GOTPCREL)
3621 continue;
3622
3623 r_symndx = htab->r_sym (irel->r_info);
3624 if (r_symndx < symtab_hdr->sh_info)
3625 h = elf_x86_64_get_local_sym_hash (htab, sec->owner,
3626 (const Elf_Internal_Rela *) irel,
3627 FALSE);
3628 else
3629 {
3630 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
3631 while (h->root.type == bfd_link_hash_indirect
3632 || h->root.type == bfd_link_hash_warning)
3633 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3634 }
3635
3636 /* STT_GNU_IFUNC must keep GOTPCREL relocations. */
3637 if (h != NULL && h->type == STT_GNU_IFUNC)
3638 continue;
3639
3640 converted = FALSE;
3641 if (!elf_x86_64_convert_load_reloc (abfd, sec, contents, irel, h,
3642 &converted, link_info))
3643 goto error_return;
3644
3645 if (converted)
3646 {
3647 changed = converted;
3648 if (h)
3649 {
3650 if (h->got.refcount > 0)
3651 h->got.refcount -= 1;
3652 }
3653 else
3654 {
3655 if (local_got_refcounts != NULL
3656 && local_got_refcounts[r_symndx] > 0)
3657 local_got_refcounts[r_symndx] -= 1;
3658 }
3659 }
3660 }
3661
3662 if (contents != NULL
3663 && elf_section_data (sec)->this_hdr.contents != contents)
3664 {
3665 if (!changed && !link_info->keep_memory)
3666 free (contents);
3667 else
3668 {
3669 /* Cache the section contents for elf_link_input_bfd. */
3670 elf_section_data (sec)->this_hdr.contents = contents;
3671 }
3672 }
3673
3674 if (elf_section_data (sec)->relocs != internal_relocs)
3675 {
3676 if (!changed)
3677 free (internal_relocs);
3678 else
3679 elf_section_data (sec)->relocs = internal_relocs;
3680 }
3681
3682 return TRUE;
3683
3684 error_return:
3685 if (contents != NULL
3686 && elf_section_data (sec)->this_hdr.contents != contents)
3687 free (contents);
3688 if (internal_relocs != NULL
3689 && elf_section_data (sec)->relocs != internal_relocs)
3690 free (internal_relocs);
3691 return FALSE;
3692}
3693
3694/* Set the sizes of the dynamic sections. */
3695
3696static bfd_boolean
3697elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3698 struct bfd_link_info *info)
3699{
3700 struct elf_x86_64_link_hash_table *htab;
3701 bfd *dynobj;
3702 asection *s;
3703 bfd_boolean relocs;
3704 bfd *ibfd;
3705 const struct elf_backend_data *bed;
3706 const struct elf_x86_64_backend_data *arch_data;
3707
3708 htab = elf_x86_64_hash_table (info);
3709 if (htab == NULL)
3710 return FALSE;
3711 bed = get_elf_backend_data (output_bfd);
3712
3713 dynobj = htab->elf.dynobj;
3714 if (dynobj == NULL)
3715 abort ();
3716
3717 /* Set up .got offsets for local syms, and space for local dynamic
3718 relocs. */
3719 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3720 {
3721 bfd_signed_vma *local_got;
3722 bfd_signed_vma *end_local_got;
3723 char *local_tls_type;
3724 bfd_vma *local_tlsdesc_gotent;
3725 bfd_size_type locsymcount;
3726 Elf_Internal_Shdr *symtab_hdr;
3727 asection *srel;
3728
3729 if (! is_x86_64_elf (ibfd))
3730 continue;
3731
3732 for (s = ibfd->sections; s != NULL; s = s->next)
3733 {
3734 struct elf_dyn_relocs *p;
3735
3736 if (!elf_x86_64_convert_load (ibfd, s, info))
3737 return FALSE;
3738
3739 for (p = (struct elf_dyn_relocs *)
3740 (elf_section_data (s)->local_dynrel);
3741 p != NULL;
3742 p = p->next)
3743 {
3744 if (!bfd_is_abs_section (p->sec)
3745 && bfd_is_abs_section (p->sec->output_section))
3746 {
3747 /* Input section has been discarded, either because
3748 it is a copy of a linkonce section or due to
3749 linker script /DISCARD/, so we'll be discarding
3750 the relocs too. */
3751 }
3752 else if (p->count != 0)
3753 {
3754 srel = elf_section_data (p->sec)->sreloc;
3755 srel->size += p->count * bed->s->sizeof_rela;
3756 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3757 && (info->flags & DF_TEXTREL) == 0)
3758 {
3759 info->flags |= DF_TEXTREL;
3760 if ((info->warn_shared_textrel && bfd_link_pic (info))
3761 || info->error_textrel)
3762 /* xgettext:c-format */
3763 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3764 p->sec->owner, p->sec);
3765 }
3766 }
3767 }
3768 }
3769
3770 local_got = elf_local_got_refcounts (ibfd);
3771 if (!local_got)
3772 continue;
3773
3774 symtab_hdr = &elf_symtab_hdr (ibfd);
3775 locsymcount = symtab_hdr->sh_info;
3776 end_local_got = local_got + locsymcount;
3777 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3778 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3779 s = htab->elf.sgot;
3780 srel = htab->elf.srelgot;
3781 for (; local_got < end_local_got;
3782 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3783 {
3784 *local_tlsdesc_gotent = (bfd_vma) -1;
3785 if (*local_got > 0)
3786 {
3787 if (GOT_TLS_GDESC_P (*local_tls_type))
3788 {
3789 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3790 - elf_x86_64_compute_jump_table_size (htab);
3791 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3792 *local_got = (bfd_vma) -2;
3793 }
3794 if (! GOT_TLS_GDESC_P (*local_tls_type)
3795 || GOT_TLS_GD_P (*local_tls_type))
3796 {
3797 *local_got = s->size;
3798 s->size += GOT_ENTRY_SIZE;
3799 if (GOT_TLS_GD_P (*local_tls_type))
3800 s->size += GOT_ENTRY_SIZE;
3801 }
3802 if (bfd_link_pic (info)
3803 || GOT_TLS_GD_ANY_P (*local_tls_type)
3804 || *local_tls_type == GOT_TLS_IE)
3805 {
3806 if (GOT_TLS_GDESC_P (*local_tls_type))
3807 {
3808 htab->elf.srelplt->size
3809 += bed->s->sizeof_rela;
3810 htab->tlsdesc_plt = (bfd_vma) -1;
3811 }
3812 if (! GOT_TLS_GDESC_P (*local_tls_type)
3813 || GOT_TLS_GD_P (*local_tls_type))
3814 srel->size += bed->s->sizeof_rela;
3815 }
3816 }
3817 else
3818 *local_got = (bfd_vma) -1;
3819 }
3820 }
3821
3822 if (htab->tls_ld_got.refcount > 0)
3823 {
3824 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3825 relocs. */
3826 htab->tls_ld_got.offset = htab->elf.sgot->size;
3827 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3828 htab->elf.srelgot->size += bed->s->sizeof_rela;
3829 }
3830 else
3831 htab->tls_ld_got.offset = -1;
3832
3833 /* Allocate global sym .plt and .got entries, and space for global
3834 sym dynamic relocs. */
3835 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3836 info);
3837
3838 /* Allocate .plt and .got entries, and space for local symbols. */
3839 htab_traverse (htab->loc_hash_table,
3840 elf_x86_64_allocate_local_dynrelocs,
3841 info);
3842
3843 /* For every jump slot reserved in the sgotplt, reloc_count is
3844 incremented. However, when we reserve space for TLS descriptors,
3845 it's not incremented, so in order to compute the space reserved
3846 for them, it suffices to multiply the reloc count by the jump
3847 slot size.
3848
3849 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3850 so that R_X86_64_IRELATIVE entries come last. */
3851 if (htab->elf.srelplt)
3852 {
3853 htab->sgotplt_jump_table_size
3854 = elf_x86_64_compute_jump_table_size (htab);
3855 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3856 }
3857 else if (htab->elf.irelplt)
3858 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3859
3860 if (htab->tlsdesc_plt)
3861 {
3862 /* If we're not using lazy TLS relocations, don't generate the
3863 PLT and GOT entries they require. */
3864 if ((info->flags & DF_BIND_NOW))
3865 htab->tlsdesc_plt = 0;
3866 else
3867 {
3868 htab->tlsdesc_got = htab->elf.sgot->size;
3869 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3870 /* Reserve room for the initial entry.
3871 FIXME: we could probably do away with it in this case. */
3872 if (htab->elf.splt->size == 0)
3873 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3874 htab->tlsdesc_plt = htab->elf.splt->size;
3875 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3876 }
3877 }
3878
3879 if (htab->elf.sgotplt)
3880 {
3881 /* Don't allocate .got.plt section if there are no GOT nor PLT
3882 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3883 if ((htab->elf.hgot == NULL
3884 || !htab->elf.hgot->ref_regular_nonweak)
3885 && (htab->elf.sgotplt->size
3886 == get_elf_backend_data (output_bfd)->got_header_size)
3887 && (htab->elf.splt == NULL
3888 || htab->elf.splt->size == 0)
3889 && (htab->elf.sgot == NULL
3890 || htab->elf.sgot->size == 0)
3891 && (htab->elf.iplt == NULL
3892 || htab->elf.iplt->size == 0)
3893 && (htab->elf.igotplt == NULL
3894 || htab->elf.igotplt->size == 0))
3895 htab->elf.sgotplt->size = 0;
3896 }
3897
3898 arch_data = (htab->plt_bnd != NULL
3899 ? &elf_x86_64_bnd_arch_bed
3900 : get_elf_x86_64_arch_data (bed));
3901
3902 if (_bfd_elf_eh_frame_present (info))
3903 {
3904 if (htab->plt_eh_frame != NULL
3905 && htab->elf.splt != NULL
3906 && htab->elf.splt->size != 0
3907 && !bfd_is_abs_section (htab->elf.splt->output_section))
3908 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
3909
3910 if (htab->plt_got_eh_frame != NULL
3911 && htab->plt_got != NULL
3912 && htab->plt_got->size != 0
3913 && !bfd_is_abs_section (htab->plt_got->output_section))
3914 htab->plt_got_eh_frame->size = arch_data->eh_frame_plt_got_size;
3915
3916 /* Unwind info for .plt.bnd and .plt.got sections are
3917 identical. */
3918 if (htab->plt_bnd_eh_frame != NULL
3919 && htab->plt_bnd != NULL
3920 && htab->plt_bnd->size != 0
3921 && !bfd_is_abs_section (htab->plt_bnd->output_section))
3922 htab->plt_bnd_eh_frame->size = arch_data->eh_frame_plt_got_size;
3923 }
3924
3925 /* We now have determined the sizes of the various dynamic sections.
3926 Allocate memory for them. */
3927 relocs = FALSE;
3928 for (s = dynobj->sections; s != NULL; s = s->next)
3929 {
3930 if ((s->flags & SEC_LINKER_CREATED) == 0)
3931 continue;
3932
3933 if (s == htab->elf.splt
3934 || s == htab->elf.sgot
3935 || s == htab->elf.sgotplt
3936 || s == htab->elf.iplt
3937 || s == htab->elf.igotplt
3938 || s == htab->plt_bnd
3939 || s == htab->plt_got
3940 || s == htab->plt_eh_frame
3941 || s == htab->plt_got_eh_frame
3942 || s == htab->plt_bnd_eh_frame
3943 || s == htab->elf.sdynbss
3944 || s == htab->elf.sdynrelro)
3945 {
3946 /* Strip this section if we don't need it; see the
3947 comment below. */
3948 }
3949 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3950 {
3951 if (s->size != 0 && s != htab->elf.srelplt)
3952 relocs = TRUE;
3953
3954 /* We use the reloc_count field as a counter if we need
3955 to copy relocs into the output file. */
3956 if (s != htab->elf.srelplt)
3957 s->reloc_count = 0;
3958 }
3959 else
3960 {
3961 /* It's not one of our sections, so don't allocate space. */
3962 continue;
3963 }
3964
3965 if (s->size == 0)
3966 {
3967 /* If we don't need this section, strip it from the
3968 output file. This is mostly to handle .rela.bss and
3969 .rela.plt. We must create both sections in
3970 create_dynamic_sections, because they must be created
3971 before the linker maps input sections to output
3972 sections. The linker does that before
3973 adjust_dynamic_symbol is called, and it is that
3974 function which decides whether anything needs to go
3975 into these sections. */
3976
3977 s->flags |= SEC_EXCLUDE;
3978 continue;
3979 }
3980
3981 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3982 continue;
3983
3984 /* Allocate memory for the section contents. We use bfd_zalloc
3985 here in case unused entries are not reclaimed before the
3986 section's contents are written out. This should not happen,
3987 but this way if it does, we get a R_X86_64_NONE reloc instead
3988 of garbage. */
3989 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3990 if (s->contents == NULL)
3991 return FALSE;
3992 }
3993
3994 if (htab->plt_eh_frame != NULL
3995 && htab->plt_eh_frame->contents != NULL)
3996 {
3997 memcpy (htab->plt_eh_frame->contents,
3998 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3999 bfd_put_32 (dynobj, htab->elf.splt->size,
4000 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
4001 }
4002
4003 if (htab->plt_got_eh_frame != NULL
4004 && htab->plt_got_eh_frame->contents != NULL)
4005 {
4006 memcpy (htab->plt_got_eh_frame->contents,
4007 arch_data->eh_frame_plt_got,
4008 htab->plt_got_eh_frame->size);
4009 bfd_put_32 (dynobj, htab->plt_got->size,
4010 (htab->plt_got_eh_frame->contents
4011 + PLT_FDE_LEN_OFFSET));
4012 }
4013
4014 if (htab->plt_bnd_eh_frame != NULL
4015 && htab->plt_bnd_eh_frame->contents != NULL)
4016 {
4017 memcpy (htab->plt_bnd_eh_frame->contents,
4018 arch_data->eh_frame_plt_got,
4019 htab->plt_bnd_eh_frame->size);
4020 bfd_put_32 (dynobj, htab->plt_bnd->size,
4021 (htab->plt_bnd_eh_frame->contents
4022 + PLT_FDE_LEN_OFFSET));
4023 }
4024
4025 if (htab->elf.dynamic_sections_created)
4026 {
4027 /* Add some entries to the .dynamic section. We fill in the
4028 values later, in elf_x86_64_finish_dynamic_sections, but we
4029 must add the entries now so that we get the correct size for
4030 the .dynamic section. The DT_DEBUG entry is filled in by the
4031 dynamic linker and used by the debugger. */
4032#define add_dynamic_entry(TAG, VAL) \
4033 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4034
4035 if (bfd_link_executable (info))
4036 {
4037 if (!add_dynamic_entry (DT_DEBUG, 0))
4038 return FALSE;
4039 }
4040
4041 if (htab->elf.splt->size != 0)
4042 {
4043 /* DT_PLTGOT is used by prelink even if there is no PLT
4044 relocation. */
4045 if (!add_dynamic_entry (DT_PLTGOT, 0))
4046 return FALSE;
4047
4048 if (htab->elf.srelplt->size != 0)
4049 {
4050 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
4051 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
4052 || !add_dynamic_entry (DT_JMPREL, 0))
4053 return FALSE;
4054 }
4055
4056 if (htab->tlsdesc_plt
4057 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
4058 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
4059 return FALSE;
4060 }
4061
4062 if (relocs)
4063 {
4064 if (!add_dynamic_entry (DT_RELA, 0)
4065 || !add_dynamic_entry (DT_RELASZ, 0)
4066 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
4067 return FALSE;
4068
4069 /* If any dynamic relocs apply to a read-only section,
4070 then we need a DT_TEXTREL entry. */
4071 if ((info->flags & DF_TEXTREL) == 0)
4072 elf_link_hash_traverse (&htab->elf,
4073 elf_x86_64_readonly_dynrelocs,
4074 info);
4075
4076 if ((info->flags & DF_TEXTREL) != 0)
4077 {
4078 if (htab->readonly_dynrelocs_against_ifunc)
4079 {
4080 info->callbacks->einfo
4081 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
4082 bfd_set_error (bfd_error_bad_value);
4083 return FALSE;
4084 }
4085
4086 if (!add_dynamic_entry (DT_TEXTREL, 0))
4087 return FALSE;
4088 }
4089 }
4090 }
4091#undef add_dynamic_entry
4092
4093 return TRUE;
4094}
4095
4096static bfd_boolean
4097elf_x86_64_always_size_sections (bfd *output_bfd,
4098 struct bfd_link_info *info)
4099{
4100 asection *tls_sec = elf_hash_table (info)->tls_sec;
4101
4102 if (tls_sec)
4103 {
4104 struct elf_link_hash_entry *tlsbase;
4105
4106 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
4107 "_TLS_MODULE_BASE_",
4108 FALSE, FALSE, FALSE);
4109
4110 if (tlsbase && tlsbase->type == STT_TLS)
4111 {
4112 struct elf_x86_64_link_hash_table *htab;
4113 struct bfd_link_hash_entry *bh = NULL;
4114 const struct elf_backend_data *bed
4115 = get_elf_backend_data (output_bfd);
4116
4117 htab = elf_x86_64_hash_table (info);
4118 if (htab == NULL)
4119 return FALSE;
4120
4121 if (!(_bfd_generic_link_add_one_symbol
4122 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
4123 tls_sec, 0, NULL, FALSE,
4124 bed->collect, &bh)))
4125 return FALSE;
4126
4127 htab->tls_module_base = bh;
4128
4129 tlsbase = (struct elf_link_hash_entry *)bh;
4130 tlsbase->def_regular = 1;
4131 tlsbase->other = STV_HIDDEN;
4132 tlsbase->root.linker_def = 1;
4133 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
4134 }
4135 }
4136
4137 return TRUE;
4138}
4139
4140/* _TLS_MODULE_BASE_ needs to be treated especially when linking
4141 executables. Rather than setting it to the beginning of the TLS
4142 section, we have to set it to the end. This function may be called
4143 multiple times, it is idempotent. */
4144
4145static void
4146elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
4147{
4148 struct elf_x86_64_link_hash_table *htab;
4149 struct bfd_link_hash_entry *base;
4150
4151 if (!bfd_link_executable (info))
4152 return;
4153
4154 htab = elf_x86_64_hash_table (info);
4155 if (htab == NULL)
4156 return;
4157
4158 base = htab->tls_module_base;
4159 if (base == NULL)
4160 return;
4161
4162 base->u.def.value = htab->elf.tls_size;
4163}
4164
4165/* Return the base VMA address which should be subtracted from real addresses
4166 when resolving @dtpoff relocation.
4167 This is PT_TLS segment p_vaddr. */
4168
4169static bfd_vma
4170elf_x86_64_dtpoff_base (struct bfd_link_info *info)
4171{
4172 /* If tls_sec is NULL, we should have signalled an error already. */
4173 if (elf_hash_table (info)->tls_sec == NULL)
4174 return 0;
4175 return elf_hash_table (info)->tls_sec->vma;
4176}
4177
4178/* Return the relocation value for @tpoff relocation
4179 if STT_TLS virtual address is ADDRESS. */
4180
4181static bfd_vma
4182elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
4183{
4184 struct elf_link_hash_table *htab = elf_hash_table (info);
4185 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
4186 bfd_vma static_tls_size;
4187
4188 /* If tls_segment is NULL, we should have signalled an error already. */
4189 if (htab->tls_sec == NULL)
4190 return 0;
4191
4192 /* Consider special static TLS alignment requirements. */
4193 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
4194 return address - static_tls_size - htab->tls_sec->vma;
4195}
4196
4197/* Is the instruction before OFFSET in CONTENTS a 32bit relative
4198 branch? */
4199
4200static bfd_boolean
4201is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
4202{
4203 /* Opcode Instruction
4204 0xe8 call
4205 0xe9 jump
4206 0x0f 0x8x conditional jump */
4207 return ((offset > 0
4208 && (contents [offset - 1] == 0xe8
4209 || contents [offset - 1] == 0xe9))
4210 || (offset > 1
4211 && contents [offset - 2] == 0x0f
4212 && (contents [offset - 1] & 0xf0) == 0x80));
4213}
4214
4215/* Relocate an x86_64 ELF section. */
4216
4217static bfd_boolean
4218elf_x86_64_relocate_section (bfd *output_bfd,
4219 struct bfd_link_info *info,
4220 bfd *input_bfd,
4221 asection *input_section,
4222 bfd_byte *contents,
4223 Elf_Internal_Rela *relocs,
4224 Elf_Internal_Sym *local_syms,
4225 asection **local_sections)
4226{
4227 struct elf_x86_64_link_hash_table *htab;
4228 Elf_Internal_Shdr *symtab_hdr;
4229 struct elf_link_hash_entry **sym_hashes;
4230 bfd_vma *local_got_offsets;
4231 bfd_vma *local_tlsdesc_gotents;
4232 Elf_Internal_Rela *rel;
4233 Elf_Internal_Rela *wrel;
4234 Elf_Internal_Rela *relend;
4235 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
4236
4237 BFD_ASSERT (is_x86_64_elf (input_bfd));
4238
4239 /* Skip if check_relocs failed. */
4240 if (input_section->check_relocs_failed)
4241 return FALSE;
4242
4243 htab = elf_x86_64_hash_table (info);
4244 if (htab == NULL)
4245 return FALSE;
4246 symtab_hdr = &elf_symtab_hdr (input_bfd);
4247 sym_hashes = elf_sym_hashes (input_bfd);
4248 local_got_offsets = elf_local_got_offsets (input_bfd);
4249 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
4250
4251 elf_x86_64_set_tls_module_base (info);
4252
4253 rel = wrel = relocs;
4254 relend = relocs + input_section->reloc_count;
4255 for (; rel < relend; wrel++, rel++)
4256 {
4257 unsigned int r_type;
4258 reloc_howto_type *howto;
4259 unsigned long r_symndx;
4260 struct elf_link_hash_entry *h;
4261 struct elf_x86_64_link_hash_entry *eh;
4262 Elf_Internal_Sym *sym;
4263 asection *sec;
4264 bfd_vma off, offplt, plt_offset;
4265 bfd_vma relocation;
4266 bfd_boolean unresolved_reloc;
4267 bfd_reloc_status_type r;
4268 int tls_type;
4269 asection *base_got, *resolved_plt;
4270 bfd_vma st_size;
4271 bfd_boolean resolved_to_zero;
4272
4273 r_type = ELF32_R_TYPE (rel->r_info);
4274 if (r_type == (int) R_X86_64_GNU_VTINHERIT
4275 || r_type == (int) R_X86_64_GNU_VTENTRY)
4276 {
4277 if (wrel != rel)
4278 *wrel = *rel;
4279 continue;
4280 }
4281
4282 if (r_type >= (int) R_X86_64_standard)
4283 {
4284 _bfd_error_handler
4285 /* xgettext:c-format */
4286 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
4287 input_bfd, r_type, input_section);
4288 bfd_set_error (bfd_error_bad_value);
4289 return FALSE;
4290 }
4291
4292 if (r_type != (int) R_X86_64_32
4293 || ABI_64_P (output_bfd))
4294 howto = x86_64_elf_howto_table + r_type;
4295 else
4296 howto = (x86_64_elf_howto_table
4297 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
4298 r_symndx = htab->r_sym (rel->r_info);
4299 h = NULL;
4300 sym = NULL;
4301 sec = NULL;
4302 unresolved_reloc = FALSE;
4303 if (r_symndx < symtab_hdr->sh_info)
4304 {
4305 sym = local_syms + r_symndx;
4306 sec = local_sections[r_symndx];
4307
4308 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
4309 &sec, rel);
4310 st_size = sym->st_size;
4311
4312 /* Relocate against local STT_GNU_IFUNC symbol. */
4313 if (!bfd_link_relocatable (info)
4314 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4315 {
4316 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
4317 rel, FALSE);
4318 if (h == NULL)
4319 abort ();
4320
4321 /* Set STT_GNU_IFUNC symbol value. */
4322 h->root.u.def.value = sym->st_value;
4323 h->root.u.def.section = sec;
4324 }
4325 }
4326 else
4327 {
4328 bfd_boolean warned ATTRIBUTE_UNUSED;
4329 bfd_boolean ignored ATTRIBUTE_UNUSED;
4330
4331 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
4332 r_symndx, symtab_hdr, sym_hashes,
4333 h, sec, relocation,
4334 unresolved_reloc, warned, ignored);
4335 st_size = h->size;
4336 }
4337
4338 if (sec != NULL && discarded_section (sec))
4339 {
4340 _bfd_clear_contents (howto, input_bfd, input_section,
4341 contents + rel->r_offset);
4342 wrel->r_offset = rel->r_offset;
4343 wrel->r_info = 0;
4344 wrel->r_addend = 0;
4345
4346 /* For ld -r, remove relocations in debug sections against
4347 sections defined in discarded sections. Not done for
4348 eh_frame editing code expects to be present. */
4349 if (bfd_link_relocatable (info)
4350 && (input_section->flags & SEC_DEBUGGING))
4351 wrel--;
4352
4353 continue;
4354 }
4355
4356 if (bfd_link_relocatable (info))
4357 {
4358 if (wrel != rel)
4359 *wrel = *rel;
4360 continue;
4361 }
4362
4363 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
4364 {
4365 if (r_type == R_X86_64_64)
4366 {
4367 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
4368 zero-extend it to 64bit if addend is zero. */
4369 r_type = R_X86_64_32;
4370 memset (contents + rel->r_offset + 4, 0, 4);
4371 }
4372 else if (r_type == R_X86_64_SIZE64)
4373 {
4374 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
4375 zero-extend it to 64bit if addend is zero. */
4376 r_type = R_X86_64_SIZE32;
4377 memset (contents + rel->r_offset + 4, 0, 4);
4378 }
4379 }
4380
4381 eh = (struct elf_x86_64_link_hash_entry *) h;
4382
4383 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4384 it here if it is defined in a non-shared object. */
4385 if (h != NULL
4386 && h->type == STT_GNU_IFUNC
4387 && h->def_regular)
4388 {
4389 bfd_vma plt_index;
4390 const char *name;
4391
4392 if ((input_section->flags & SEC_ALLOC) == 0)
4393 {
4394 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4395 sections because such sections are not SEC_ALLOC and
4396 thus ld.so will not process them. */
4397 if ((input_section->flags & SEC_DEBUGGING) != 0)
4398 continue;
4399 abort ();
4400 }
4401
4402 switch (r_type)
4403 {
4404 default:
4405 break;
4406
4407 case R_X86_64_GOTPCREL:
4408 case R_X86_64_GOTPCRELX:
4409 case R_X86_64_REX_GOTPCRELX:
4410 case R_X86_64_GOTPCREL64:
4411 base_got = htab->elf.sgot;
4412 off = h->got.offset;
4413
4414 if (base_got == NULL)
4415 abort ();
4416
4417 if (off == (bfd_vma) -1)
4418 {
4419 /* We can't use h->got.offset here to save state, or
4420 even just remember the offset, as finish_dynamic_symbol
4421 would use that as offset into .got. */
4422
4423 if (h->plt.offset == (bfd_vma) -1)
4424 abort ();
4425
4426 if (htab->elf.splt != NULL)
4427 {
4428 plt_index = h->plt.offset / plt_entry_size - 1;
4429 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4430 base_got = htab->elf.sgotplt;
4431 }
4432 else
4433 {
4434 plt_index = h->plt.offset / plt_entry_size;
4435 off = plt_index * GOT_ENTRY_SIZE;
4436 base_got = htab->elf.igotplt;
4437 }
4438
4439 if (h->dynindx == -1
4440 || h->forced_local
4441 || info->symbolic)
4442 {
4443 /* This references the local defitionion. We must
4444 initialize this entry in the global offset table.
4445 Since the offset must always be a multiple of 8,
4446 we use the least significant bit to record
4447 whether we have initialized it already.
4448
4449 When doing a dynamic link, we create a .rela.got
4450 relocation entry to initialize the value. This
4451 is done in the finish_dynamic_symbol routine. */
4452 if ((off & 1) != 0)
4453 off &= ~1;
4454 else
4455 {
4456 bfd_put_64 (output_bfd, relocation,
4457 base_got->contents + off);
4458 /* Note that this is harmless for the GOTPLT64
4459 case, as -1 | 1 still is -1. */
4460 h->got.offset |= 1;
4461 }
4462 }
4463 }
4464
4465 relocation = (base_got->output_section->vma
4466 + base_got->output_offset + off);
4467
4468 goto do_relocation;
4469 }
4470
4471 if (h->plt.offset == (bfd_vma) -1)
4472 {
4473 /* Handle static pointers of STT_GNU_IFUNC symbols. */
4474 if (r_type == htab->pointer_r_type
4475 && (input_section->flags & SEC_CODE) == 0)
4476 goto do_ifunc_pointer;
4477 goto bad_ifunc_reloc;
4478 }
4479
4480 /* STT_GNU_IFUNC symbol must go through PLT. */
4481 if (htab->elf.splt != NULL)
4482 {
4483 if (htab->plt_bnd != NULL)
4484 {
4485 resolved_plt = htab->plt_bnd;
4486 plt_offset = eh->plt_bnd.offset;
4487 }
4488 else
4489 {
4490 resolved_plt = htab->elf.splt;
4491 plt_offset = h->plt.offset;
4492 }
4493 }
4494 else
4495 {
4496 resolved_plt = htab->elf.iplt;
4497 plt_offset = h->plt.offset;
4498 }
4499
4500 relocation = (resolved_plt->output_section->vma
4501 + resolved_plt->output_offset + plt_offset);
4502
4503 switch (r_type)
4504 {
4505 default:
4506bad_ifunc_reloc:
4507 if (h->root.root.string)
4508 name = h->root.root.string;
4509 else
4510 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4511 NULL);
4512 _bfd_error_handler
4513 /* xgettext:c-format */
4514 (_("%B: relocation %s against STT_GNU_IFUNC "
4515 "symbol `%s' isn't supported"), input_bfd,
4516 howto->name, name);
4517 bfd_set_error (bfd_error_bad_value);
4518 return FALSE;
4519
4520 case R_X86_64_32S:
4521 if (bfd_link_pic (info))
4522 abort ();
4523 goto do_relocation;
4524
4525 case R_X86_64_32:
4526 if (ABI_64_P (output_bfd))
4527 goto do_relocation;
4528 /* FALLTHROUGH */
4529 case R_X86_64_64:
4530do_ifunc_pointer:
4531 if (rel->r_addend != 0)
4532 {
4533 if (h->root.root.string)
4534 name = h->root.root.string;
4535 else
4536 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4537 sym, NULL);
4538 _bfd_error_handler
4539 /* xgettext:c-format */
4540 (_("%B: relocation %s against STT_GNU_IFUNC "
4541 "symbol `%s' has non-zero addend: %d"),
4542 input_bfd, howto->name, name, rel->r_addend);
4543 bfd_set_error (bfd_error_bad_value);
4544 return FALSE;
4545 }
4546
4547 /* Generate dynamic relcoation only when there is a
4548 non-GOT reference in a shared object or there is no
4549 PLT. */
4550 if ((bfd_link_pic (info) && h->non_got_ref)
4551 || h->plt.offset == (bfd_vma) -1)
4552 {
4553 Elf_Internal_Rela outrel;
4554 asection *sreloc;
4555
4556 /* Need a dynamic relocation to get the real function
4557 address. */
4558 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
4559 info,
4560 input_section,
4561 rel->r_offset);
4562 if (outrel.r_offset == (bfd_vma) -1
4563 || outrel.r_offset == (bfd_vma) -2)
4564 abort ();
4565
4566 outrel.r_offset += (input_section->output_section->vma
4567 + input_section->output_offset);
4568
4569 if (h->dynindx == -1
4570 || h->forced_local
4571 || bfd_link_executable (info))
4572 {
4573 /* This symbol is resolved locally. */
4574 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4575 outrel.r_addend = (h->root.u.def.value
4576 + h->root.u.def.section->output_section->vma
4577 + h->root.u.def.section->output_offset);
4578 }
4579 else
4580 {
4581 outrel.r_info = htab->r_info (h->dynindx, r_type);
4582 outrel.r_addend = 0;
4583 }
4584
4585 /* Dynamic relocations are stored in
4586 1. .rela.ifunc section in PIC object.
4587 2. .rela.got section in dynamic executable.
4588 3. .rela.iplt section in static executable. */
4589 if (bfd_link_pic (info))
4590 sreloc = htab->elf.irelifunc;
4591 else if (htab->elf.splt != NULL)
4592 sreloc = htab->elf.srelgot;
4593 else
4594 sreloc = htab->elf.irelplt;
4595 elf_append_rela (output_bfd, sreloc, &outrel);
4596
4597 /* If this reloc is against an external symbol, we
4598 do not want to fiddle with the addend. Otherwise,
4599 we need to include the symbol value so that it
4600 becomes an addend for the dynamic reloc. For an
4601 internal symbol, we have updated addend. */
4602 continue;
4603 }
4604 /* FALLTHROUGH */
4605 case R_X86_64_PC32:
4606 case R_X86_64_PC32_BND:
4607 case R_X86_64_PC64:
4608 case R_X86_64_PLT32:
4609 case R_X86_64_PLT32_BND:
4610 goto do_relocation;
4611 }
4612 }
4613
4614 resolved_to_zero = (eh != NULL
4615 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
4616 eh->has_got_reloc,
4617 eh));
4618
4619 /* When generating a shared object, the relocations handled here are
4620 copied into the output file to be resolved at run time. */
4621 switch (r_type)
4622 {
4623 case R_X86_64_GOT32:
4624 case R_X86_64_GOT64:
4625 /* Relocation is to the entry for this symbol in the global
4626 offset table. */
4627 case R_X86_64_GOTPCREL:
4628 case R_X86_64_GOTPCRELX:
4629 case R_X86_64_REX_GOTPCRELX:
4630 case R_X86_64_GOTPCREL64:
4631 /* Use global offset table entry as symbol value. */
4632 case R_X86_64_GOTPLT64:
4633 /* This is obsolete and treated the the same as GOT64. */
4634 base_got = htab->elf.sgot;
4635
4636 if (htab->elf.sgot == NULL)
4637 abort ();
4638
4639 if (h != NULL)
4640 {
4641 bfd_boolean dyn;
4642
4643 off = h->got.offset;
4644 if (h->needs_plt
4645 && h->plt.offset != (bfd_vma)-1
4646 && off == (bfd_vma)-1)
4647 {
4648 /* We can't use h->got.offset here to save
4649 state, or even just remember the offset, as
4650 finish_dynamic_symbol would use that as offset into
4651 .got. */
4652 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
4653 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4654 base_got = htab->elf.sgotplt;
4655 }
4656
4657 dyn = htab->elf.dynamic_sections_created;
4658
4659 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
4660 || (bfd_link_pic (info)
4661 && SYMBOL_REFERENCES_LOCAL (info, h))
4662 || (ELF_ST_VISIBILITY (h->other)
4663 && h->root.type == bfd_link_hash_undefweak))
4664 {
4665 /* This is actually a static link, or it is a -Bsymbolic
4666 link and the symbol is defined locally, or the symbol
4667 was forced to be local because of a version file. We
4668 must initialize this entry in the global offset table.
4669 Since the offset must always be a multiple of 8, we
4670 use the least significant bit to record whether we
4671 have initialized it already.
4672
4673 When doing a dynamic link, we create a .rela.got
4674 relocation entry to initialize the value. This is
4675 done in the finish_dynamic_symbol routine. */
4676 if ((off & 1) != 0)
4677 off &= ~1;
4678 else
4679 {
4680 bfd_put_64 (output_bfd, relocation,
4681 base_got->contents + off);
4682 /* Note that this is harmless for the GOTPLT64 case,
4683 as -1 | 1 still is -1. */
4684 h->got.offset |= 1;
4685 }
4686 }
4687 else
4688 unresolved_reloc = FALSE;
4689 }
4690 else
4691 {
4692 if (local_got_offsets == NULL)
4693 abort ();
4694
4695 off = local_got_offsets[r_symndx];
4696
4697 /* The offset must always be a multiple of 8. We use
4698 the least significant bit to record whether we have
4699 already generated the necessary reloc. */
4700 if ((off & 1) != 0)
4701 off &= ~1;
4702 else
4703 {
4704 bfd_put_64 (output_bfd, relocation,
4705 base_got->contents + off);
4706
4707 if (bfd_link_pic (info))
4708 {
4709 asection *s;
4710 Elf_Internal_Rela outrel;
4711
4712 /* We need to generate a R_X86_64_RELATIVE reloc
4713 for the dynamic linker. */
4714 s = htab->elf.srelgot;
4715 if (s == NULL)
4716 abort ();
4717
4718 outrel.r_offset = (base_got->output_section->vma
4719 + base_got->output_offset
4720 + off);
4721 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4722 outrel.r_addend = relocation;
4723 elf_append_rela (output_bfd, s, &outrel);
4724 }
4725
4726 local_got_offsets[r_symndx] |= 1;
4727 }
4728 }
4729
4730 if (off >= (bfd_vma) -2)
4731 abort ();
4732
4733 relocation = base_got->output_section->vma
4734 + base_got->output_offset + off;
4735 if (r_type != R_X86_64_GOTPCREL
4736 && r_type != R_X86_64_GOTPCRELX
4737 && r_type != R_X86_64_REX_GOTPCRELX
4738 && r_type != R_X86_64_GOTPCREL64)
4739 relocation -= htab->elf.sgotplt->output_section->vma
4740 - htab->elf.sgotplt->output_offset;
4741
4742 break;
4743
4744 case R_X86_64_GOTOFF64:
4745 /* Relocation is relative to the start of the global offset
4746 table. */
4747
4748 /* Check to make sure it isn't a protected function or data
4749 symbol for shared library since it may not be local when
4750 used as function address or with copy relocation. We also
4751 need to make sure that a symbol is referenced locally. */
4752 if (bfd_link_pic (info) && h)
4753 {
4754 if (!h->def_regular)
4755 {
4756 const char *v;
4757
4758 switch (ELF_ST_VISIBILITY (h->other))
4759 {
4760 case STV_HIDDEN:
4761 v = _("hidden symbol");
4762 break;
4763 case STV_INTERNAL:
4764 v = _("internal symbol");
4765 break;
4766 case STV_PROTECTED:
4767 v = _("protected symbol");
4768 break;
4769 default:
4770 v = _("symbol");
4771 break;
4772 }
4773
4774 _bfd_error_handler
4775 /* xgettext:c-format */
4776 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4777 input_bfd, v, h->root.root.string);
4778 bfd_set_error (bfd_error_bad_value);
4779 return FALSE;
4780 }
4781 else if (!bfd_link_executable (info)
4782 && !SYMBOL_REFERENCES_LOCAL (info, h)
4783 && (h->type == STT_FUNC
4784 || h->type == STT_OBJECT)
4785 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4786 {
4787 _bfd_error_handler
4788 /* xgettext:c-format */
4789 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4790 input_bfd,
4791 h->type == STT_FUNC ? "function" : "data",
4792 h->root.root.string);
4793 bfd_set_error (bfd_error_bad_value);
4794 return FALSE;
4795 }
4796 }
4797
4798 /* Note that sgot is not involved in this
4799 calculation. We always want the start of .got.plt. If we
4800 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4801 permitted by the ABI, we might have to change this
4802 calculation. */
4803 relocation -= htab->elf.sgotplt->output_section->vma
4804 + htab->elf.sgotplt->output_offset;
4805 break;
4806
4807 case R_X86_64_GOTPC32:
4808 case R_X86_64_GOTPC64:
4809 /* Use global offset table as symbol value. */
4810 relocation = htab->elf.sgotplt->output_section->vma
4811 + htab->elf.sgotplt->output_offset;
4812 unresolved_reloc = FALSE;
4813 break;
4814
4815 case R_X86_64_PLTOFF64:
4816 /* Relocation is PLT entry relative to GOT. For local
4817 symbols it's the symbol itself relative to GOT. */
4818 if (h != NULL
4819 /* See PLT32 handling. */
4820 && (h->plt.offset != (bfd_vma) -1
4821 || eh->plt_got.offset != (bfd_vma) -1)
4822 && htab->elf.splt != NULL)
4823 {
4824 if (eh->plt_got.offset != (bfd_vma) -1)
4825 {
4826 /* Use the GOT PLT. */
4827 resolved_plt = htab->plt_got;
4828 plt_offset = eh->plt_got.offset;
4829 }
4830 else if (htab->plt_bnd != NULL)
4831 {
4832 resolved_plt = htab->plt_bnd;
4833 plt_offset = eh->plt_bnd.offset;
4834 }
4835 else
4836 {
4837 resolved_plt = htab->elf.splt;
4838 plt_offset = h->plt.offset;
4839 }
4840
4841 relocation = (resolved_plt->output_section->vma
4842 + resolved_plt->output_offset
4843 + plt_offset);
4844 unresolved_reloc = FALSE;
4845 }
4846
4847 relocation -= htab->elf.sgotplt->output_section->vma
4848 + htab->elf.sgotplt->output_offset;
4849 break;
4850
4851 case R_X86_64_PLT32:
4852 case R_X86_64_PLT32_BND:
4853 /* Relocation is to the entry for this symbol in the
4854 procedure linkage table. */
4855
4856 /* Resolve a PLT32 reloc against a local symbol directly,
4857 without using the procedure linkage table. */
4858 if (h == NULL)
4859 break;
4860
4861 if ((h->plt.offset == (bfd_vma) -1
4862 && eh->plt_got.offset == (bfd_vma) -1)
4863 || htab->elf.splt == NULL)
4864 {
4865 /* We didn't make a PLT entry for this symbol. This
4866 happens when statically linking PIC code, or when
4867 using -Bsymbolic. */
4868 break;
4869 }
4870
4871 if (h->plt.offset != (bfd_vma) -1)
4872 {
4873 if (htab->plt_bnd != NULL)
4874 {
4875 resolved_plt = htab->plt_bnd;
4876 plt_offset = eh->plt_bnd.offset;
4877 }
4878 else
4879 {
4880 resolved_plt = htab->elf.splt;
4881 plt_offset = h->plt.offset;
4882 }
4883 }
4884 else
4885 {
4886 /* Use the GOT PLT. */
4887 resolved_plt = htab->plt_got;
4888 plt_offset = eh->plt_got.offset;
4889 }
4890
4891 relocation = (resolved_plt->output_section->vma
4892 + resolved_plt->output_offset
4893 + plt_offset);
4894 unresolved_reloc = FALSE;
4895 break;
4896
4897 case R_X86_64_SIZE32:
4898 case R_X86_64_SIZE64:
4899 /* Set to symbol size. */
4900 relocation = st_size;
4901 goto direct;
4902
4903 case R_X86_64_PC8:
4904 case R_X86_64_PC16:
4905 case R_X86_64_PC32:
4906 case R_X86_64_PC32_BND:
4907 /* Don't complain about -fPIC if the symbol is undefined when
4908 building executable unless it is unresolved weak symbol. */
4909 if ((input_section->flags & SEC_ALLOC) != 0
4910 && (input_section->flags & SEC_READONLY) != 0
4911 && h != NULL
4912 && ((bfd_link_executable (info)
4913 && h->root.type == bfd_link_hash_undefweak
4914 && !resolved_to_zero)
4915 || (bfd_link_pic (info)
4916 && !(bfd_link_pie (info)
4917 && h->root.type == bfd_link_hash_undefined))))
4918 {
4919 bfd_boolean fail = FALSE;
4920 bfd_boolean branch
4921 = ((r_type == R_X86_64_PC32
4922 || r_type == R_X86_64_PC32_BND)
4923 && is_32bit_relative_branch (contents, rel->r_offset));
4924
4925 if (SYMBOL_REFERENCES_LOCAL (info, h))
4926 {
4927 /* Symbol is referenced locally. Make sure it is
4928 defined locally or for a branch. */
4929 fail = (!(h->def_regular || ELF_COMMON_DEF_P (h))
4930 && !branch);
4931 }
4932 else if (!(bfd_link_pie (info)
4933 && (h->needs_copy || eh->needs_copy)))
4934 {
4935 /* Symbol doesn't need copy reloc and isn't referenced
4936 locally. We only allow branch to symbol with
4937 non-default visibility. */
4938 fail = (!branch
4939 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4940 }
4941
4942 if (fail)
4943 return elf_x86_64_need_pic (input_bfd, input_section,
4944 h, NULL, NULL, howto);
4945 }
4946 /* Fall through. */
4947
4948 case R_X86_64_8:
4949 case R_X86_64_16:
4950 case R_X86_64_32:
4951 case R_X86_64_PC64:
4952 case R_X86_64_64:
4953 /* FIXME: The ABI says the linker should make sure the value is
4954 the same when it's zeroextended to 64 bit. */
4955
4956direct:
4957 if ((input_section->flags & SEC_ALLOC) == 0)
4958 break;
4959
4960 /* Don't copy a pc-relative relocation into the output file
4961 if the symbol needs copy reloc or the symbol is undefined
4962 when building executable. Copy dynamic function pointer
4963 relocations. Don't generate dynamic relocations against
4964 resolved undefined weak symbols in PIE. */
4965 if ((bfd_link_pic (info)
4966 && !(bfd_link_pie (info)
4967 && h != NULL
4968 && (h->needs_copy
4969 || eh->needs_copy
4970 || h->root.type == bfd_link_hash_undefined)
4971 && (IS_X86_64_PCREL_TYPE (r_type)
4972 || r_type == R_X86_64_SIZE32
4973 || r_type == R_X86_64_SIZE64))
4974 && (h == NULL
4975 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4976 && !resolved_to_zero)
4977 || h->root.type != bfd_link_hash_undefweak))
4978 && ((! IS_X86_64_PCREL_TYPE (r_type)
4979 && r_type != R_X86_64_SIZE32
4980 && r_type != R_X86_64_SIZE64)
4981 || ! SYMBOL_CALLS_LOCAL (info, h)))
4982 || (ELIMINATE_COPY_RELOCS
4983 && !bfd_link_pic (info)
4984 && h != NULL
4985 && h->dynindx != -1
4986 && (!h->non_got_ref
4987 || eh->func_pointer_refcount > 0
4988 || (h->root.type == bfd_link_hash_undefweak
4989 && !resolved_to_zero))
4990 && ((h->def_dynamic && !h->def_regular)
4991 /* Undefined weak symbol is bound locally when
4992 PIC is false. */
4993 || h->root.type == bfd_link_hash_undefined)))
4994 {
4995 Elf_Internal_Rela outrel;
4996 bfd_boolean skip, relocate;
4997 asection *sreloc;
4998
4999 /* When generating a shared object, these relocations
5000 are copied into the output file to be resolved at run
5001 time. */
5002 skip = FALSE;
5003 relocate = FALSE;
5004
5005 outrel.r_offset =
5006 _bfd_elf_section_offset (output_bfd, info, input_section,
5007 rel->r_offset);
5008 if (outrel.r_offset == (bfd_vma) -1)
5009 skip = TRUE;
5010 else if (outrel.r_offset == (bfd_vma) -2)
5011 skip = TRUE, relocate = TRUE;
5012
5013 outrel.r_offset += (input_section->output_section->vma
5014 + input_section->output_offset);
5015
5016 if (skip)
5017 memset (&outrel, 0, sizeof outrel);
5018
5019 /* h->dynindx may be -1 if this symbol was marked to
5020 become local. */
5021 else if (h != NULL
5022 && h->dynindx != -1
5023 && (IS_X86_64_PCREL_TYPE (r_type)
5024 || !(bfd_link_executable (info)
5025 || SYMBOLIC_BIND (info, h))
5026 || ! h->def_regular))
5027 {
5028 outrel.r_info = htab->r_info (h->dynindx, r_type);
5029 outrel.r_addend = rel->r_addend;
5030 }
5031 else
5032 {
5033 /* This symbol is local, or marked to become local.
5034 When relocation overflow check is disabled, we
5035 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
5036 if (r_type == htab->pointer_r_type
5037 || (r_type == R_X86_64_32
5038 && info->no_reloc_overflow_check))
5039 {
5040 relocate = TRUE;
5041 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5042 outrel.r_addend = relocation + rel->r_addend;
5043 }
5044 else if (r_type == R_X86_64_64
5045 && !ABI_64_P (output_bfd))
5046 {
5047 relocate = TRUE;
5048 outrel.r_info = htab->r_info (0,
5049 R_X86_64_RELATIVE64);
5050 outrel.r_addend = relocation + rel->r_addend;
5051 /* Check addend overflow. */
5052 if ((outrel.r_addend & 0x80000000)
5053 != (rel->r_addend & 0x80000000))
5054 {
5055 const char *name;
5056 int addend = rel->r_addend;
5057 if (h && h->root.root.string)
5058 name = h->root.root.string;
5059 else
5060 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
5061 sym, NULL);
5062 if (addend < 0)
5063 _bfd_error_handler
5064 /* xgettext:c-format */
5065 (_("%B: addend -0x%x in relocation %s against "
5066 "symbol `%s' at 0x%lx in section `%A' is "
5067 "out of range"),
5068 input_bfd, addend, howto->name, name,
5069 (unsigned long) rel->r_offset, input_section);
5070 else
5071 _bfd_error_handler
5072 /* xgettext:c-format */
5073 (_("%B: addend 0x%x in relocation %s against "
5074 "symbol `%s' at 0x%lx in section `%A' is "
5075 "out of range"),
5076 input_bfd, addend, howto->name, name,
5077 (unsigned long) rel->r_offset, input_section);
5078 bfd_set_error (bfd_error_bad_value);
5079 return FALSE;
5080 }
5081 }
5082 else
5083 {
5084 long sindx;
5085
5086 if (bfd_is_abs_section (sec))
5087 sindx = 0;
5088 else if (sec == NULL || sec->owner == NULL)
5089 {
5090 bfd_set_error (bfd_error_bad_value);
5091 return FALSE;
5092 }
5093 else
5094 {
5095 asection *osec;
5096
5097 /* We are turning this relocation into one
5098 against a section symbol. It would be
5099 proper to subtract the symbol's value,
5100 osec->vma, from the emitted reloc addend,
5101 but ld.so expects buggy relocs. */
5102 osec = sec->output_section;
5103 sindx = elf_section_data (osec)->dynindx;
5104 if (sindx == 0)
5105 {
5106 asection *oi = htab->elf.text_index_section;
5107 sindx = elf_section_data (oi)->dynindx;
5108 }
5109 BFD_ASSERT (sindx != 0);
5110 }
5111
5112 outrel.r_info = htab->r_info (sindx, r_type);
5113 outrel.r_addend = relocation + rel->r_addend;
5114 }
5115 }
5116
5117 sreloc = elf_section_data (input_section)->sreloc;
5118
5119 if (sreloc == NULL || sreloc->contents == NULL)
5120 {
5121 r = bfd_reloc_notsupported;
5122 goto check_relocation_error;
5123 }
5124
5125 elf_append_rela (output_bfd, sreloc, &outrel);
5126
5127 /* If this reloc is against an external symbol, we do
5128 not want to fiddle with the addend. Otherwise, we
5129 need to include the symbol value so that it becomes
5130 an addend for the dynamic reloc. */
5131 if (! relocate)
5132 continue;
5133 }
5134
5135 break;
5136
5137 case R_X86_64_TLSGD:
5138 case R_X86_64_GOTPC32_TLSDESC:
5139 case R_X86_64_TLSDESC_CALL:
5140 case R_X86_64_GOTTPOFF:
5141 tls_type = GOT_UNKNOWN;
5142 if (h == NULL && local_got_offsets)
5143 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
5144 else if (h != NULL)
5145 tls_type = elf_x86_64_hash_entry (h)->tls_type;
5146
5147 if (! elf_x86_64_tls_transition (info, input_bfd,
5148 input_section, contents,
5149 symtab_hdr, sym_hashes,
5150 &r_type, tls_type, rel,
5151 relend, h, r_symndx, TRUE))
5152 return FALSE;
5153
5154 if (r_type == R_X86_64_TPOFF32)
5155 {
5156 bfd_vma roff = rel->r_offset;
5157
5158 BFD_ASSERT (! unresolved_reloc);
5159
5160 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
5161 {
5162 /* GD->LE transition. For 64bit, change
5163 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5164 .word 0x6666; rex64; call __tls_get_addr@PLT
5165 or
5166 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5167 .byte 0x66; rex64
5168 call *__tls_get_addr@GOTPCREL(%rip)
5169 which may be converted to
5170 addr32 call __tls_get_addr
5171 into:
5172 movq %fs:0, %rax
5173 leaq foo@tpoff(%rax), %rax
5174 For 32bit, change
5175 leaq foo@tlsgd(%rip), %rdi
5176 .word 0x6666; rex64; call __tls_get_addr@PLT
5177 or
5178 leaq foo@tlsgd(%rip), %rdi
5179 .byte 0x66; rex64
5180 call *__tls_get_addr@GOTPCREL(%rip)
5181 which may be converted to
5182 addr32 call __tls_get_addr
5183 into:
5184 movl %fs:0, %eax
5185 leaq foo@tpoff(%rax), %rax
5186 For largepic, change:
5187 leaq foo@tlsgd(%rip), %rdi
5188 movabsq $__tls_get_addr@pltoff, %rax
5189 addq %r15, %rax
5190 call *%rax
5191 into:
5192 movq %fs:0, %rax
5193 leaq foo@tpoff(%rax), %rax
5194 nopw 0x0(%rax,%rax,1) */
5195 int largepic = 0;
5196 if (ABI_64_P (output_bfd))
5197 {
5198 if (contents[roff + 5] == 0xb8)
5199 {
5200 memcpy (contents + roff - 3,
5201 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
5202 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5203 largepic = 1;
5204 }
5205 else
5206 memcpy (contents + roff - 4,
5207 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
5208 16);
5209 }
5210 else
5211 memcpy (contents + roff - 3,
5212 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
5213 15);
5214 bfd_put_32 (output_bfd,
5215 elf_x86_64_tpoff (info, relocation),
5216 contents + roff + 8 + largepic);
5217 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
5218 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
5219 rel++;
5220 wrel++;
5221 continue;
5222 }
5223 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
5224 {
5225 /* GDesc -> LE transition.
5226 It's originally something like:
5227 leaq x@tlsdesc(%rip), %rax
5228
5229 Change it to:
5230 movl $x@tpoff, %rax. */
5231
5232 unsigned int val, type;
5233
5234 type = bfd_get_8 (input_bfd, contents + roff - 3);
5235 val = bfd_get_8 (input_bfd, contents + roff - 1);
5236 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
5237 contents + roff - 3);
5238 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
5239 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
5240 contents + roff - 1);
5241 bfd_put_32 (output_bfd,
5242 elf_x86_64_tpoff (info, relocation),
5243 contents + roff);
5244 continue;
5245 }
5246 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
5247 {
5248 /* GDesc -> LE transition.
5249 It's originally:
5250 call *(%rax)
5251 Turn it into:
5252 xchg %ax,%ax. */
5253 bfd_put_8 (output_bfd, 0x66, contents + roff);
5254 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5255 continue;
5256 }
5257 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
5258 {
5259 /* IE->LE transition:
5260 For 64bit, originally it can be one of:
5261 movq foo@gottpoff(%rip), %reg
5262 addq foo@gottpoff(%rip), %reg
5263 We change it into:
5264 movq $foo, %reg
5265 leaq foo(%reg), %reg
5266 addq $foo, %reg.
5267 For 32bit, originally it can be one of:
5268 movq foo@gottpoff(%rip), %reg
5269 addl foo@gottpoff(%rip), %reg
5270 We change it into:
5271 movq $foo, %reg
5272 leal foo(%reg), %reg
5273 addl $foo, %reg. */
5274
5275 unsigned int val, type, reg;
5276
5277 if (roff >= 3)
5278 val = bfd_get_8 (input_bfd, contents + roff - 3);
5279 else
5280 val = 0;
5281 type = bfd_get_8 (input_bfd, contents + roff - 2);
5282 reg = bfd_get_8 (input_bfd, contents + roff - 1);
5283 reg >>= 3;
5284 if (type == 0x8b)
5285 {
5286 /* movq */
5287 if (val == 0x4c)
5288 bfd_put_8 (output_bfd, 0x49,
5289 contents + roff - 3);
5290 else if (!ABI_64_P (output_bfd) && val == 0x44)
5291 bfd_put_8 (output_bfd, 0x41,
5292 contents + roff - 3);
5293 bfd_put_8 (output_bfd, 0xc7,
5294 contents + roff - 2);
5295 bfd_put_8 (output_bfd, 0xc0 | reg,
5296 contents + roff - 1);
5297 }
5298 else if (reg == 4)
5299 {
5300 /* addq/addl -> addq/addl - addressing with %rsp/%r12
5301 is special */
5302 if (val == 0x4c)
5303 bfd_put_8 (output_bfd, 0x49,
5304 contents + roff - 3);
5305 else if (!ABI_64_P (output_bfd) && val == 0x44)
5306 bfd_put_8 (output_bfd, 0x41,
5307 contents + roff - 3);
5308 bfd_put_8 (output_bfd, 0x81,
5309 contents + roff - 2);
5310 bfd_put_8 (output_bfd, 0xc0 | reg,
5311 contents + roff - 1);
5312 }
5313 else
5314 {
5315 /* addq/addl -> leaq/leal */
5316 if (val == 0x4c)
5317 bfd_put_8 (output_bfd, 0x4d,
5318 contents + roff - 3);
5319 else if (!ABI_64_P (output_bfd) && val == 0x44)
5320 bfd_put_8 (output_bfd, 0x45,
5321 contents + roff - 3);
5322 bfd_put_8 (output_bfd, 0x8d,
5323 contents + roff - 2);
5324 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
5325 contents + roff - 1);
5326 }
5327 bfd_put_32 (output_bfd,
5328 elf_x86_64_tpoff (info, relocation),
5329 contents + roff);
5330 continue;
5331 }
5332 else
5333 BFD_ASSERT (FALSE);
5334 }
5335
5336 if (htab->elf.sgot == NULL)
5337 abort ();
5338
5339 if (h != NULL)
5340 {
5341 off = h->got.offset;
5342 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
5343 }
5344 else
5345 {
5346 if (local_got_offsets == NULL)
5347 abort ();
5348
5349 off = local_got_offsets[r_symndx];
5350 offplt = local_tlsdesc_gotents[r_symndx];
5351 }
5352
5353 if ((off & 1) != 0)
5354 off &= ~1;
5355 else
5356 {
5357 Elf_Internal_Rela outrel;
5358 int dr_type, indx;
5359 asection *sreloc;
5360
5361 if (htab->elf.srelgot == NULL)
5362 abort ();
5363
5364 indx = h && h->dynindx != -1 ? h->dynindx : 0;
5365
5366 if (GOT_TLS_GDESC_P (tls_type))
5367 {
5368 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
5369 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
5370 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
5371 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
5372 + htab->elf.sgotplt->output_offset
5373 + offplt
5374 + htab->sgotplt_jump_table_size);
5375 sreloc = htab->elf.srelplt;
5376 if (indx == 0)
5377 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
5378 else
5379 outrel.r_addend = 0;
5380 elf_append_rela (output_bfd, sreloc, &outrel);
5381 }
5382
5383 sreloc = htab->elf.srelgot;
5384
5385 outrel.r_offset = (htab->elf.sgot->output_section->vma
5386 + htab->elf.sgot->output_offset + off);
5387
5388 if (GOT_TLS_GD_P (tls_type))
5389 dr_type = R_X86_64_DTPMOD64;
5390 else if (GOT_TLS_GDESC_P (tls_type))
5391 goto dr_done;
5392 else
5393 dr_type = R_X86_64_TPOFF64;
5394
5395 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
5396 outrel.r_addend = 0;
5397 if ((dr_type == R_X86_64_TPOFF64
5398 || dr_type == R_X86_64_TLSDESC) && indx == 0)
5399 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
5400 outrel.r_info = htab->r_info (indx, dr_type);
5401
5402 elf_append_rela (output_bfd, sreloc, &outrel);
5403
5404 if (GOT_TLS_GD_P (tls_type))
5405 {
5406 if (indx == 0)
5407 {
5408 BFD_ASSERT (! unresolved_reloc);
5409 bfd_put_64 (output_bfd,
5410 relocation - elf_x86_64_dtpoff_base (info),
5411 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5412 }
5413 else
5414 {
5415 bfd_put_64 (output_bfd, 0,
5416 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5417 outrel.r_info = htab->r_info (indx,
5418 R_X86_64_DTPOFF64);
5419 outrel.r_offset += GOT_ENTRY_SIZE;
5420 elf_append_rela (output_bfd, sreloc,
5421 &outrel);
5422 }
5423 }
5424
5425 dr_done:
5426 if (h != NULL)
5427 h->got.offset |= 1;
5428 else
5429 local_got_offsets[r_symndx] |= 1;
5430 }
5431
5432 if (off >= (bfd_vma) -2
5433 && ! GOT_TLS_GDESC_P (tls_type))
5434 abort ();
5435 if (r_type == ELF32_R_TYPE (rel->r_info))
5436 {
5437 if (r_type == R_X86_64_GOTPC32_TLSDESC
5438 || r_type == R_X86_64_TLSDESC_CALL)
5439 relocation = htab->elf.sgotplt->output_section->vma
5440 + htab->elf.sgotplt->output_offset
5441 + offplt + htab->sgotplt_jump_table_size;
5442 else
5443 relocation = htab->elf.sgot->output_section->vma
5444 + htab->elf.sgot->output_offset + off;
5445 unresolved_reloc = FALSE;
5446 }
5447 else
5448 {
5449 bfd_vma roff = rel->r_offset;
5450
5451 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
5452 {
5453 /* GD->IE transition. For 64bit, change
5454 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5455 .word 0x6666; rex64; call __tls_get_addr@PLT
5456 or
5457 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5458 .byte 0x66; rex64
5459 call *__tls_get_addr@GOTPCREL(%rip
5460 which may be converted to
5461 addr32 call __tls_get_addr
5462 into:
5463 movq %fs:0, %rax
5464 addq foo@gottpoff(%rip), %rax
5465 For 32bit, change
5466 leaq foo@tlsgd(%rip), %rdi
5467 .word 0x6666; rex64; call __tls_get_addr@PLT
5468 or
5469 leaq foo@tlsgd(%rip), %rdi
5470 .byte 0x66; rex64;
5471 call *__tls_get_addr@GOTPCREL(%rip)
5472 which may be converted to
5473 addr32 call __tls_get_addr
5474 into:
5475 movl %fs:0, %eax
5476 addq foo@gottpoff(%rip), %rax
5477 For largepic, change:
5478 leaq foo@tlsgd(%rip), %rdi
5479 movabsq $__tls_get_addr@pltoff, %rax
5480 addq %r15, %rax
5481 call *%rax
5482 into:
5483 movq %fs:0, %rax
5484 addq foo@gottpoff(%rax), %rax
5485 nopw 0x0(%rax,%rax,1) */
5486 int largepic = 0;
5487 if (ABI_64_P (output_bfd))
5488 {
5489 if (contents[roff + 5] == 0xb8)
5490 {
5491 memcpy (contents + roff - 3,
5492 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5493 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5494 largepic = 1;
5495 }
5496 else
5497 memcpy (contents + roff - 4,
5498 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5499 16);
5500 }
5501 else
5502 memcpy (contents + roff - 3,
5503 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5504 15);
5505
5506 relocation = (htab->elf.sgot->output_section->vma
5507 + htab->elf.sgot->output_offset + off
5508 - roff
5509 - largepic
5510 - input_section->output_section->vma
5511 - input_section->output_offset
5512 - 12);
5513 bfd_put_32 (output_bfd, relocation,
5514 contents + roff + 8 + largepic);
5515 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5516 rel++;
5517 wrel++;
5518 continue;
5519 }
5520 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
5521 {
5522 /* GDesc -> IE transition.
5523 It's originally something like:
5524 leaq x@tlsdesc(%rip), %rax
5525
5526 Change it to:
5527 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5528
5529 /* Now modify the instruction as appropriate. To
5530 turn a leaq into a movq in the form we use it, it
5531 suffices to change the second byte from 0x8d to
5532 0x8b. */
5533 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
5534
5535 bfd_put_32 (output_bfd,
5536 htab->elf.sgot->output_section->vma
5537 + htab->elf.sgot->output_offset + off
5538 - rel->r_offset
5539 - input_section->output_section->vma
5540 - input_section->output_offset
5541 - 4,
5542 contents + roff);
5543 continue;
5544 }
5545 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
5546 {
5547 /* GDesc -> IE transition.
5548 It's originally:
5549 call *(%rax)
5550
5551 Change it to:
5552 xchg %ax, %ax. */
5553
5554 bfd_put_8 (output_bfd, 0x66, contents + roff);
5555 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5556 continue;
5557 }
5558 else
5559 BFD_ASSERT (FALSE);
5560 }
5561 break;
5562
5563 case R_X86_64_TLSLD:
5564 if (! elf_x86_64_tls_transition (info, input_bfd,
5565 input_section, contents,
5566 symtab_hdr, sym_hashes,
5567 &r_type, GOT_UNKNOWN, rel,
5568 relend, h, r_symndx, TRUE))
5569 return FALSE;
5570
5571 if (r_type != R_X86_64_TLSLD)
5572 {
5573 /* LD->LE transition:
5574 leaq foo@tlsld(%rip), %rdi
5575 call __tls_get_addr@PLT
5576 For 64bit, we change it into:
5577 .word 0x6666; .byte 0x66; movq %fs:0, %rax
5578 For 32bit, we change it into:
5579 nopl 0x0(%rax); movl %fs:0, %eax
5580 Or
5581 leaq foo@tlsld(%rip), %rdi;
5582 call *__tls_get_addr@GOTPCREL(%rip)
5583 which may be converted to
5584 addr32 call __tls_get_addr
5585 For 64bit, we change it into:
5586 .word 0x6666; .word 0x6666; movq %fs:0, %rax
5587 For 32bit, we change it into:
5588 nopw 0x0(%rax); movl %fs:0, %eax
5589 For largepic, change:
5590 leaq foo@tlsgd(%rip), %rdi
5591 movabsq $__tls_get_addr@pltoff, %rax
5592 addq %rbx, %rax
5593 call *%rax
5594 into
5595 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
5596 movq %fs:0, %eax */
5597
5598 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
5599 if (ABI_64_P (output_bfd))
5600 {
5601 if (contents[rel->r_offset + 5] == 0xb8)
5602 memcpy (contents + rel->r_offset - 3,
5603 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5604 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5605 else if (contents[rel->r_offset + 4] == 0xff
5606 || contents[rel->r_offset + 4] == 0x67)
5607 memcpy (contents + rel->r_offset - 3,
5608 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
5609 13);
5610 else
5611 memcpy (contents + rel->r_offset - 3,
5612 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5613 }
5614 else
5615 {
5616 if (contents[rel->r_offset + 4] == 0xff)
5617 memcpy (contents + rel->r_offset - 3,
5618 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
5619 13);
5620 else
5621 memcpy (contents + rel->r_offset - 3,
5622 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5623 }
5624 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
5625 and R_X86_64_PLTOFF64. */
5626 rel++;
5627 wrel++;
5628 continue;
5629 }
5630
5631 if (htab->elf.sgot == NULL)
5632 abort ();
5633
5634 off = htab->tls_ld_got.offset;
5635 if (off & 1)
5636 off &= ~1;
5637 else
5638 {
5639 Elf_Internal_Rela outrel;
5640
5641 if (htab->elf.srelgot == NULL)
5642 abort ();
5643
5644 outrel.r_offset = (htab->elf.sgot->output_section->vma
5645 + htab->elf.sgot->output_offset + off);
5646
5647 bfd_put_64 (output_bfd, 0,
5648 htab->elf.sgot->contents + off);
5649 bfd_put_64 (output_bfd, 0,
5650 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5651 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
5652 outrel.r_addend = 0;
5653 elf_append_rela (output_bfd, htab->elf.srelgot,
5654 &outrel);
5655 htab->tls_ld_got.offset |= 1;
5656 }
5657 relocation = htab->elf.sgot->output_section->vma
5658 + htab->elf.sgot->output_offset + off;
5659 unresolved_reloc = FALSE;
5660 break;
5661
5662 case R_X86_64_DTPOFF32:
5663 if (!bfd_link_executable (info)
5664 || (input_section->flags & SEC_CODE) == 0)
5665 relocation -= elf_x86_64_dtpoff_base (info);
5666 else
5667 relocation = elf_x86_64_tpoff (info, relocation);
5668 break;
5669
5670 case R_X86_64_TPOFF32:
5671 case R_X86_64_TPOFF64:
5672 BFD_ASSERT (bfd_link_executable (info));
5673 relocation = elf_x86_64_tpoff (info, relocation);
5674 break;
5675
5676 case R_X86_64_DTPOFF64:
5677 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
5678 relocation -= elf_x86_64_dtpoff_base (info);
5679 break;
5680
5681 default:
5682 break;
5683 }
5684
5685 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5686 because such sections are not SEC_ALLOC and thus ld.so will
5687 not process them. */
5688 if (unresolved_reloc
5689 && !((input_section->flags & SEC_DEBUGGING) != 0
5690 && h->def_dynamic)
5691 && _bfd_elf_section_offset (output_bfd, info, input_section,
5692 rel->r_offset) != (bfd_vma) -1)
5693 {
5694 _bfd_error_handler
5695 /* xgettext:c-format */
5696 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5697 input_bfd,
5698 input_section,
5699 (long) rel->r_offset,
5700 howto->name,
5701 h->root.root.string);
5702 return FALSE;
5703 }
5704
5705do_relocation:
5706 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5707 contents, rel->r_offset,
5708 relocation, rel->r_addend);
5709
5710check_relocation_error:
5711 if (r != bfd_reloc_ok)
5712 {
5713 const char *name;
5714
5715 if (h != NULL)
5716 name = h->root.root.string;
5717 else
5718 {
5719 name = bfd_elf_string_from_elf_section (input_bfd,
5720 symtab_hdr->sh_link,
5721 sym->st_name);
5722 if (name == NULL)
5723 return FALSE;
5724 if (*name == '\0')
5725 name = bfd_section_name (input_bfd, sec);
5726 }
5727
5728 if (r == bfd_reloc_overflow)
5729 (*info->callbacks->reloc_overflow)
5730 (info, (h ? &h->root : NULL), name, howto->name,
5731 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
5732 else
5733 {
5734 _bfd_error_handler
5735 /* xgettext:c-format */
5736 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5737 input_bfd, input_section,
5738 (long) rel->r_offset, name, (int) r);
5739 return FALSE;
5740 }
5741 }
5742
5743 if (wrel != rel)
5744 *wrel = *rel;
5745 }
5746
5747 if (wrel != rel)
5748 {
5749 Elf_Internal_Shdr *rel_hdr;
5750 size_t deleted = rel - wrel;
5751
5752 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5753 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5754 if (rel_hdr->sh_size == 0)
5755 {
5756 /* It is too late to remove an empty reloc section. Leave
5757 one NONE reloc.
5758 ??? What is wrong with an empty section??? */
5759 rel_hdr->sh_size = rel_hdr->sh_entsize;
5760 deleted -= 1;
5761 }
5762 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5763 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5764 input_section->reloc_count -= deleted;
5765 }
5766
5767 return TRUE;
5768}
5769
5770/* Finish up dynamic symbol handling. We set the contents of various
5771 dynamic sections here. */
5772
5773static bfd_boolean
5774elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
5775 struct bfd_link_info *info,
5776 struct elf_link_hash_entry *h,
5777 Elf_Internal_Sym *sym)
5778{
5779 struct elf_x86_64_link_hash_table *htab;
5780 const struct elf_x86_64_backend_data *abed;
5781 bfd_boolean use_plt_bnd;
5782 struct elf_x86_64_link_hash_entry *eh;
5783 bfd_boolean local_undefweak;
5784
5785 htab = elf_x86_64_hash_table (info);
5786 if (htab == NULL)
5787 return FALSE;
5788
5789 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5790 section only if there is .plt section. */
5791 use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL;
5792 abed = (use_plt_bnd
5793 ? &elf_x86_64_bnd_arch_bed
5794 : get_elf_x86_64_backend_data (output_bfd));
5795
5796 eh = (struct elf_x86_64_link_hash_entry *) h;
5797
5798 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5799 resolved undefined weak symbols in executable so that their
5800 references have value 0 at run-time. */
5801 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5802 eh->has_got_reloc,
5803 eh);
5804
5805 if (h->plt.offset != (bfd_vma) -1)
5806 {
5807 bfd_vma plt_index;
5808 bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset;
5809 bfd_vma plt_plt_insn_end, plt_got_insn_size;
5810 Elf_Internal_Rela rela;
5811 bfd_byte *loc;
5812 asection *plt, *gotplt, *relplt, *resolved_plt;
5813 const struct elf_backend_data *bed;
5814 bfd_vma plt_got_pcrel_offset;
5815
5816 /* When building a static executable, use .iplt, .igot.plt and
5817 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5818 if (htab->elf.splt != NULL)
5819 {
5820 plt = htab->elf.splt;
5821 gotplt = htab->elf.sgotplt;
5822 relplt = htab->elf.srelplt;
5823 }
5824 else
5825 {
5826 plt = htab->elf.iplt;
5827 gotplt = htab->elf.igotplt;
5828 relplt = htab->elf.irelplt;
5829 }
5830
5831 /* This symbol has an entry in the procedure linkage table. Set
5832 it up. */
5833 if ((h->dynindx == -1
5834 && !local_undefweak
5835 && !((h->forced_local || bfd_link_executable (info))
5836 && h->def_regular
5837 && h->type == STT_GNU_IFUNC))
5838 || plt == NULL
5839 || gotplt == NULL
5840 || relplt == NULL)
5841 abort ();
5842
5843 /* Get the index in the procedure linkage table which
5844 corresponds to this symbol. This is the index of this symbol
5845 in all the symbols for which we are making plt entries. The
5846 first entry in the procedure linkage table is reserved.
5847
5848 Get the offset into the .got table of the entry that
5849 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5850 bytes. The first three are reserved for the dynamic linker.
5851
5852 For static executables, we don't reserve anything. */
5853
5854 if (plt == htab->elf.splt)
5855 {
5856 got_offset = h->plt.offset / abed->plt_entry_size - 1;
5857 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
5858 }
5859 else
5860 {
5861 got_offset = h->plt.offset / abed->plt_entry_size;
5862 got_offset = got_offset * GOT_ENTRY_SIZE;
5863 }
5864
5865 plt_plt_insn_end = abed->plt_plt_insn_end;
5866 plt_plt_offset = abed->plt_plt_offset;
5867 plt_got_insn_size = abed->plt_got_insn_size;
5868 plt_got_offset = abed->plt_got_offset;
5869 if (use_plt_bnd)
5870 {
5871 /* Use the second PLT with BND relocations. */
5872 const bfd_byte *plt_entry, *plt2_entry;
5873
5874 if (eh->has_bnd_reloc)
5875 {
5876 plt_entry = elf_x86_64_bnd_plt_entry;
5877 plt2_entry = elf_x86_64_bnd_plt2_entry;
5878 }
5879 else
5880 {
5881 plt_entry = elf_x86_64_legacy_plt_entry;
5882 plt2_entry = elf_x86_64_legacy_plt2_entry;
5883
5884 /* Subtract 1 since there is no BND prefix. */
5885 plt_plt_insn_end -= 1;
5886 plt_plt_offset -= 1;
5887 plt_got_insn_size -= 1;
5888 plt_got_offset -= 1;
5889 }
5890
5891 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry)
5892 == sizeof (elf_x86_64_legacy_plt_entry));
5893
5894 /* Fill in the entry in the procedure linkage table. */
5895 memcpy (plt->contents + h->plt.offset,
5896 plt_entry, sizeof (elf_x86_64_legacy_plt_entry));
5897 /* Fill in the entry in the second PLT. */
5898 memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset,
5899 plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5900
5901 resolved_plt = htab->plt_bnd;
5902 plt_offset = eh->plt_bnd.offset;
5903 }
5904 else
5905 {
5906 /* Fill in the entry in the procedure linkage table. */
5907 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
5908 abed->plt_entry_size);
5909
5910 resolved_plt = plt;
5911 plt_offset = h->plt.offset;
5912 }
5913
5914 /* Insert the relocation positions of the plt section. */
5915
5916 /* Put offset the PC-relative instruction referring to the GOT entry,
5917 subtracting the size of that instruction. */
5918 plt_got_pcrel_offset = (gotplt->output_section->vma
5919 + gotplt->output_offset
5920 + got_offset
5921 - resolved_plt->output_section->vma
5922 - resolved_plt->output_offset
5923 - plt_offset
5924 - plt_got_insn_size);
5925
5926 /* Check PC-relative offset overflow in PLT entry. */
5927 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5928 /* xgettext:c-format */
5929 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5930 output_bfd, h->root.root.string);
5931
5932 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5933 resolved_plt->contents + plt_offset + plt_got_offset);
5934
5935 /* Fill in the entry in the global offset table, initially this
5936 points to the second part of the PLT entry. Leave the entry
5937 as zero for undefined weak symbol in PIE. No PLT relocation
5938 against undefined weak symbol in PIE. */
5939 if (!local_undefweak)
5940 {
5941 bfd_put_64 (output_bfd, (plt->output_section->vma
5942 + plt->output_offset
5943 + h->plt.offset
5944 + abed->plt_lazy_offset),
5945 gotplt->contents + got_offset);
5946
5947 /* Fill in the entry in the .rela.plt section. */
5948 rela.r_offset = (gotplt->output_section->vma
5949 + gotplt->output_offset
5950 + got_offset);
5951 if (h->dynindx == -1
5952 || ((bfd_link_executable (info)
5953 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5954 && h->def_regular
5955 && h->type == STT_GNU_IFUNC))
5956 {
5957 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5958 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5959 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5960 rela.r_addend = (h->root.u.def.value
5961 + h->root.u.def.section->output_section->vma
5962 + h->root.u.def.section->output_offset);
5963 /* R_X86_64_IRELATIVE comes last. */
5964 plt_index = htab->next_irelative_index--;
5965 }
5966 else
5967 {
5968 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5969 rela.r_addend = 0;
5970 plt_index = htab->next_jump_slot_index++;
5971 }
5972
5973 /* Don't fill PLT entry for static executables. */
5974 if (plt == htab->elf.splt)
5975 {
5976 bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
5977
5978 /* Put relocation index. */
5979 bfd_put_32 (output_bfd, plt_index,
5980 (plt->contents + h->plt.offset
5981 + abed->plt_reloc_offset));
5982
5983 /* Put offset for jmp .PLT0 and check for overflow. We don't
5984 check relocation index for overflow since branch displacement
5985 will overflow first. */
5986 if (plt0_offset > 0x80000000)
5987 /* xgettext:c-format */
5988 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5989 output_bfd, h->root.root.string);
5990 bfd_put_32 (output_bfd, - plt0_offset,
5991 plt->contents + h->plt.offset + plt_plt_offset);
5992 }
5993
5994 bed = get_elf_backend_data (output_bfd);
5995 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5996 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5997 }
5998 }
5999 else if (eh->plt_got.offset != (bfd_vma) -1)
6000 {
6001 bfd_vma got_offset, plt_offset, plt_got_offset, plt_got_insn_size;
6002 asection *plt, *got;
6003 bfd_boolean got_after_plt;
6004 int32_t got_pcrel_offset;
6005 const bfd_byte *got_plt_entry;
6006
6007 /* Set the entry in the GOT procedure linkage table. */
6008 plt = htab->plt_got;
6009 got = htab->elf.sgot;
6010 got_offset = h->got.offset;
6011
6012 if (got_offset == (bfd_vma) -1
6013 || h->type == STT_GNU_IFUNC
6014 || plt == NULL
6015 || got == NULL)
6016 abort ();
6017
6018 /* Use the second PLT entry template for the GOT PLT since they
6019 are the identical. */
6020 plt_got_insn_size = elf_x86_64_bnd_arch_bed.plt_got_insn_size;
6021 plt_got_offset = elf_x86_64_bnd_arch_bed.plt_got_offset;
6022 if (eh->has_bnd_reloc)
6023 got_plt_entry = elf_x86_64_bnd_plt2_entry;
6024 else
6025 {
6026 got_plt_entry = elf_x86_64_legacy_plt2_entry;
6027
6028 /* Subtract 1 since there is no BND prefix. */
6029 plt_got_insn_size -= 1;
6030 plt_got_offset -= 1;
6031 }
6032
6033 /* Fill in the entry in the GOT procedure linkage table. */
6034 plt_offset = eh->plt_got.offset;
6035 memcpy (plt->contents + plt_offset,
6036 got_plt_entry, sizeof (elf_x86_64_legacy_plt2_entry));
6037
6038 /* Put offset the PC-relative instruction referring to the GOT
6039 entry, subtracting the size of that instruction. */
6040 got_pcrel_offset = (got->output_section->vma
6041 + got->output_offset
6042 + got_offset
6043 - plt->output_section->vma
6044 - plt->output_offset
6045 - plt_offset
6046 - plt_got_insn_size);
6047
6048 /* Check PC-relative offset overflow in GOT PLT entry. */
6049 got_after_plt = got->output_section->vma > plt->output_section->vma;
6050 if ((got_after_plt && got_pcrel_offset < 0)
6051 || (!got_after_plt && got_pcrel_offset > 0))
6052 /* xgettext:c-format */
6053 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
6054 output_bfd, h->root.root.string);
6055
6056 bfd_put_32 (output_bfd, got_pcrel_offset,
6057 plt->contents + plt_offset + plt_got_offset);
6058 }
6059
6060 if (!local_undefweak
6061 && !h->def_regular
6062 && (h->plt.offset != (bfd_vma) -1
6063 || eh->plt_got.offset != (bfd_vma) -1))
6064 {
6065 /* Mark the symbol as undefined, rather than as defined in
6066 the .plt section. Leave the value if there were any
6067 relocations where pointer equality matters (this is a clue
6068 for the dynamic linker, to make function pointer
6069 comparisons work between an application and shared
6070 library), otherwise set it to zero. If a function is only
6071 called from a binary, there is no need to slow down
6072 shared libraries because of that. */
6073 sym->st_shndx = SHN_UNDEF;
6074 if (!h->pointer_equality_needed)
6075 sym->st_value = 0;
6076 }
6077
6078 /* Don't generate dynamic GOT relocation against undefined weak
6079 symbol in executable. */
6080 if (h->got.offset != (bfd_vma) -1
6081 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
6082 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE
6083 && !local_undefweak)
6084 {
6085 Elf_Internal_Rela rela;
6086 asection *relgot = htab->elf.srelgot;
6087
6088 /* This symbol has an entry in the global offset table. Set it
6089 up. */
6090 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
6091 abort ();
6092
6093 rela.r_offset = (htab->elf.sgot->output_section->vma
6094 + htab->elf.sgot->output_offset
6095 + (h->got.offset &~ (bfd_vma) 1));
6096
6097 /* If this is a static link, or it is a -Bsymbolic link and the
6098 symbol is defined locally or was forced to be local because
6099 of a version file, we just want to emit a RELATIVE reloc.
6100 The entry in the global offset table will already have been
6101 initialized in the relocate_section function. */
6102 if (h->def_regular
6103 && h->type == STT_GNU_IFUNC)
6104 {
6105 if (h->plt.offset == (bfd_vma) -1)
6106 {
6107 /* STT_GNU_IFUNC is referenced without PLT. */
6108 if (htab->elf.splt == NULL)
6109 {
6110 /* use .rel[a].iplt section to store .got relocations
6111 in static executable. */
6112 relgot = htab->elf.irelplt;
6113 }
6114 if (SYMBOL_REFERENCES_LOCAL (info, h))
6115 {
6116 rela.r_info = htab->r_info (0,
6117 R_X86_64_IRELATIVE);
6118 rela.r_addend = (h->root.u.def.value
6119 + h->root.u.def.section->output_section->vma
6120 + h->root.u.def.section->output_offset);
6121 }
6122 else
6123 goto do_glob_dat;
6124 }
6125 else if (bfd_link_pic (info))
6126 {
6127 /* Generate R_X86_64_GLOB_DAT. */
6128 goto do_glob_dat;
6129 }
6130 else
6131 {
6132 asection *plt;
6133
6134 if (!h->pointer_equality_needed)
6135 abort ();
6136
6137 /* For non-shared object, we can't use .got.plt, which
6138 contains the real function addres if we need pointer
6139 equality. We load the GOT entry with the PLT entry. */
6140 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
6141 bfd_put_64 (output_bfd, (plt->output_section->vma
6142 + plt->output_offset
6143 + h->plt.offset),
6144 htab->elf.sgot->contents + h->got.offset);
6145 return TRUE;
6146 }
6147 }
6148 else if (bfd_link_pic (info)
6149 && SYMBOL_REFERENCES_LOCAL (info, h))
6150 {
6151 if (!h->def_regular)
6152 return FALSE;
6153 BFD_ASSERT((h->got.offset & 1) != 0);
6154 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
6155 rela.r_addend = (h->root.u.def.value
6156 + h->root.u.def.section->output_section->vma
6157 + h->root.u.def.section->output_offset);
6158 }
6159 else
6160 {
6161 BFD_ASSERT((h->got.offset & 1) == 0);
6162do_glob_dat:
6163 bfd_put_64 (output_bfd, (bfd_vma) 0,
6164 htab->elf.sgot->contents + h->got.offset);
6165 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
6166 rela.r_addend = 0;
6167 }
6168
6169 elf_append_rela (output_bfd, relgot, &rela);
6170 }
6171
6172 if (h->needs_copy)
6173 {
6174 Elf_Internal_Rela rela;
6175 asection *s;
6176
6177 /* This symbol needs a copy reloc. Set it up. */
6178
6179 if (h->dynindx == -1
6180 || (h->root.type != bfd_link_hash_defined
6181 && h->root.type != bfd_link_hash_defweak)
6182 || htab->elf.srelbss == NULL
6183 || htab->elf.sreldynrelro == NULL)
6184 abort ();
6185
6186 rela.r_offset = (h->root.u.def.value
6187 + h->root.u.def.section->output_section->vma
6188 + h->root.u.def.section->output_offset);
6189 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
6190 rela.r_addend = 0;
6191 if (h->root.u.def.section == htab->elf.sdynrelro)
6192 s = htab->elf.sreldynrelro;
6193 else
6194 s = htab->elf.srelbss;
6195 elf_append_rela (output_bfd, s, &rela);
6196 }
6197
6198 return TRUE;
6199}
6200
6201/* Finish up local dynamic symbol handling. We set the contents of
6202 various dynamic sections here. */
6203
6204static bfd_boolean
6205elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
6206{
6207 struct elf_link_hash_entry *h
6208 = (struct elf_link_hash_entry *) *slot;
6209 struct bfd_link_info *info
6210 = (struct bfd_link_info *) inf;
6211
6212 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
6213 info, h, NULL);
6214}
6215
6216/* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
6217 here since undefined weak symbol may not be dynamic and may not be
6218 called for elf_x86_64_finish_dynamic_symbol. */
6219
6220static bfd_boolean
6221elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
6222 void *inf)
6223{
6224 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
6225 struct bfd_link_info *info = (struct bfd_link_info *) inf;
6226
6227 if (h->root.type != bfd_link_hash_undefweak
6228 || h->dynindx != -1)
6229 return TRUE;
6230
6231 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
6232 info, h, NULL);
6233}
6234
6235/* Used to decide how to sort relocs in an optimal manner for the
6236 dynamic linker, before writing them out. */
6237
6238static enum elf_reloc_type_class
6239elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
6240 const asection *rel_sec ATTRIBUTE_UNUSED,
6241 const Elf_Internal_Rela *rela)
6242{
6243 bfd *abfd = info->output_bfd;
6244 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
6245 struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
6246
6247 if (htab->elf.dynsym != NULL
6248 && htab->elf.dynsym->contents != NULL)
6249 {
6250 /* Check relocation against STT_GNU_IFUNC symbol if there are
6251 dynamic symbols. */
6252 unsigned long r_symndx = htab->r_sym (rela->r_info);
6253 if (r_symndx != STN_UNDEF)
6254 {
6255 Elf_Internal_Sym sym;
6256 if (!bed->s->swap_symbol_in (abfd,
6257 (htab->elf.dynsym->contents
6258 + r_symndx * bed->s->sizeof_sym),
6259 0, &sym))
6260 abort ();
6261
6262 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
6263 return reloc_class_ifunc;
6264 }
6265 }
6266
6267 switch ((int) ELF32_R_TYPE (rela->r_info))
6268 {
6269 case R_X86_64_IRELATIVE:
6270 return reloc_class_ifunc;
6271 case R_X86_64_RELATIVE:
6272 case R_X86_64_RELATIVE64:
6273 return reloc_class_relative;
6274 case R_X86_64_JUMP_SLOT:
6275 return reloc_class_plt;
6276 case R_X86_64_COPY:
6277 return reloc_class_copy;
6278 default:
6279 return reloc_class_normal;
6280 }
6281}
6282
6283/* Finish up the dynamic sections. */
6284
6285static bfd_boolean
6286elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
6287 struct bfd_link_info *info)
6288{
6289 struct elf_x86_64_link_hash_table *htab;
6290 bfd *dynobj;
6291 asection *sdyn;
6292 const struct elf_x86_64_backend_data *abed;
6293
6294 htab = elf_x86_64_hash_table (info);
6295 if (htab == NULL)
6296 return FALSE;
6297
6298 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
6299 section only if there is .plt section. */
6300 abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL
6301 ? &elf_x86_64_bnd_arch_bed
6302 : get_elf_x86_64_backend_data (output_bfd));
6303
6304 dynobj = htab->elf.dynobj;
6305 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
6306
6307 if (htab->elf.dynamic_sections_created)
6308 {
6309 bfd_byte *dyncon, *dynconend;
6310 const struct elf_backend_data *bed;
6311 bfd_size_type sizeof_dyn;
6312
6313 if (sdyn == NULL || htab->elf.sgot == NULL)
6314 abort ();
6315
6316 bed = get_elf_backend_data (dynobj);
6317 sizeof_dyn = bed->s->sizeof_dyn;
6318 dyncon = sdyn->contents;
6319 dynconend = sdyn->contents + sdyn->size;
6320 for (; dyncon < dynconend; dyncon += sizeof_dyn)
6321 {
6322 Elf_Internal_Dyn dyn;
6323 asection *s;
6324
6325 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
6326
6327 switch (dyn.d_tag)
6328 {
6329 default:
6330 continue;
6331
6332 case DT_PLTGOT:
6333 s = htab->elf.sgotplt;
6334 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
6335 break;
6336
6337 case DT_JMPREL:
6338 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
6339 break;
6340
6341 case DT_PLTRELSZ:
6342 s = htab->elf.srelplt->output_section;
6343 dyn.d_un.d_val = s->size;
6344 break;
6345
6346 case DT_TLSDESC_PLT:
6347 s = htab->elf.splt;
6348 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
6349 + htab->tlsdesc_plt;
6350 break;
6351
6352 case DT_TLSDESC_GOT:
6353 s = htab->elf.sgot;
6354 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
6355 + htab->tlsdesc_got;
6356 break;
6357 }
6358
6359 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
6360 }
6361
6362 /* Fill in the special first entry in the procedure linkage table. */
6363 if (htab->elf.splt && htab->elf.splt->size > 0)
6364 {
6365 /* Fill in the first entry in the procedure linkage table. */
6366 memcpy (htab->elf.splt->contents,
6367 abed->plt0_entry, abed->plt_entry_size);
6368 /* Add offset for pushq GOT+8(%rip), since the instruction
6369 uses 6 bytes subtract this value. */
6370 bfd_put_32 (output_bfd,
6371 (htab->elf.sgotplt->output_section->vma
6372 + htab->elf.sgotplt->output_offset
6373 + 8
6374 - htab->elf.splt->output_section->vma
6375 - htab->elf.splt->output_offset
6376 - 6),
6377 htab->elf.splt->contents + abed->plt0_got1_offset);
6378 /* Add offset for the PC-relative instruction accessing GOT+16,
6379 subtracting the offset to the end of that instruction. */
6380 bfd_put_32 (output_bfd,
6381 (htab->elf.sgotplt->output_section->vma
6382 + htab->elf.sgotplt->output_offset
6383 + 16
6384 - htab->elf.splt->output_section->vma
6385 - htab->elf.splt->output_offset
6386 - abed->plt0_got2_insn_end),
6387 htab->elf.splt->contents + abed->plt0_got2_offset);
6388
6389 elf_section_data (htab->elf.splt->output_section)
6390 ->this_hdr.sh_entsize = abed->plt_entry_size;
6391
6392 if (htab->tlsdesc_plt)
6393 {
6394 bfd_put_64 (output_bfd, (bfd_vma) 0,
6395 htab->elf.sgot->contents + htab->tlsdesc_got);
6396
6397 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
6398 abed->plt0_entry, abed->plt_entry_size);
6399
6400 /* Add offset for pushq GOT+8(%rip), since the
6401 instruction uses 6 bytes subtract this value. */
6402 bfd_put_32 (output_bfd,
6403 (htab->elf.sgotplt->output_section->vma
6404 + htab->elf.sgotplt->output_offset
6405 + 8
6406 - htab->elf.splt->output_section->vma
6407 - htab->elf.splt->output_offset
6408 - htab->tlsdesc_plt
6409 - 6),
6410 htab->elf.splt->contents
6411 + htab->tlsdesc_plt + abed->plt0_got1_offset);
6412 /* Add offset for the PC-relative instruction accessing GOT+TDG,
6413 where TGD stands for htab->tlsdesc_got, subtracting the offset
6414 to the end of that instruction. */
6415 bfd_put_32 (output_bfd,
6416 (htab->elf.sgot->output_section->vma
6417 + htab->elf.sgot->output_offset
6418 + htab->tlsdesc_got
6419 - htab->elf.splt->output_section->vma
6420 - htab->elf.splt->output_offset
6421 - htab->tlsdesc_plt
6422 - abed->plt0_got2_insn_end),
6423 htab->elf.splt->contents
6424 + htab->tlsdesc_plt + abed->plt0_got2_offset);
6425 }
6426 }
6427 }
6428
6429 if (htab->plt_bnd != NULL)
6430 elf_section_data (htab->plt_bnd->output_section)
6431 ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry);
6432
6433 if (htab->elf.sgotplt)
6434 {
6435 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
6436 {
6437 _bfd_error_handler
6438 (_("discarded output section: `%A'"), htab->elf.sgotplt);
6439 return FALSE;
6440 }
6441
6442 /* Fill in the first three entries in the global offset table. */
6443 if (htab->elf.sgotplt->size > 0)
6444 {
6445 /* Set the first entry in the global offset table to the address of
6446 the dynamic section. */
6447 if (sdyn == NULL)
6448 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
6449 else
6450 bfd_put_64 (output_bfd,
6451 sdyn->output_section->vma + sdyn->output_offset,
6452 htab->elf.sgotplt->contents);
6453 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
6454 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
6455 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
6456 }
6457
6458 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
6459 GOT_ENTRY_SIZE;
6460 }
6461
6462 /* Adjust .eh_frame for .plt section. */
6463 if (htab->plt_eh_frame != NULL
6464 && htab->plt_eh_frame->contents != NULL)
6465 {
6466 if (htab->elf.splt != NULL
6467 && htab->elf.splt->size != 0
6468 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
6469 && htab->elf.splt->output_section != NULL
6470 && htab->plt_eh_frame->output_section != NULL)
6471 {
6472 bfd_vma plt_start = htab->elf.splt->output_section->vma;
6473 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
6474 + htab->plt_eh_frame->output_offset
6475 + PLT_FDE_START_OFFSET;
6476 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6477 htab->plt_eh_frame->contents
6478 + PLT_FDE_START_OFFSET);
6479 }
6480 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
6481 {
6482 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6483 htab->plt_eh_frame,
6484 htab->plt_eh_frame->contents))
6485 return FALSE;
6486 }
6487 }
6488
6489 /* Adjust .eh_frame for .plt.got section. */
6490 if (htab->plt_got_eh_frame != NULL
6491 && htab->plt_got_eh_frame->contents != NULL)
6492 {
6493 if (htab->plt_got != NULL
6494 && htab->plt_got->size != 0
6495 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
6496 && htab->plt_got->output_section != NULL
6497 && htab->plt_got_eh_frame->output_section != NULL)
6498 {
6499 bfd_vma plt_start = htab->plt_got->output_section->vma;
6500 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
6501 + htab->plt_got_eh_frame->output_offset
6502 + PLT_FDE_START_OFFSET;
6503 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6504 htab->plt_got_eh_frame->contents
6505 + PLT_FDE_START_OFFSET);
6506 }
6507 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
6508 {
6509 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6510 htab->plt_got_eh_frame,
6511 htab->plt_got_eh_frame->contents))
6512 return FALSE;
6513 }
6514 }
6515
6516 /* Adjust .eh_frame for .plt.bnd section. */
6517 if (htab->plt_bnd_eh_frame != NULL
6518 && htab->plt_bnd_eh_frame->contents != NULL)
6519 {
6520 if (htab->plt_bnd != NULL
6521 && htab->plt_bnd->size != 0
6522 && (htab->plt_bnd->flags & SEC_EXCLUDE) == 0
6523 && htab->plt_bnd->output_section != NULL
6524 && htab->plt_bnd_eh_frame->output_section != NULL)
6525 {
6526 bfd_vma plt_start = htab->plt_bnd->output_section->vma;
6527 bfd_vma eh_frame_start = htab->plt_bnd_eh_frame->output_section->vma
6528 + htab->plt_bnd_eh_frame->output_offset
6529 + PLT_FDE_START_OFFSET;
6530 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6531 htab->plt_bnd_eh_frame->contents
6532 + PLT_FDE_START_OFFSET);
6533 }
6534 if (htab->plt_bnd_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
6535 {
6536 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6537 htab->plt_bnd_eh_frame,
6538 htab->plt_bnd_eh_frame->contents))
6539 return FALSE;
6540 }
6541 }
6542
6543 if (htab->elf.sgot && htab->elf.sgot->size > 0)
6544 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
6545 = GOT_ENTRY_SIZE;
6546
6547 /* Fill PLT entries for undefined weak symbols in PIE. */
6548 if (bfd_link_pie (info))
6549 bfd_hash_traverse (&info->hash->table,
6550 elf_x86_64_pie_finish_undefweak_symbol,
6551 info);
6552
6553 return TRUE;
6554}
6555
6556/* Fill PLT/GOT entries and allocate dynamic relocations for local
6557 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
6558 It has to be done before elf_link_sort_relocs is called so that
6559 dynamic relocations are properly sorted. */
6560
6561static bfd_boolean
6562elf_x86_64_output_arch_local_syms
6563 (bfd *output_bfd ATTRIBUTE_UNUSED,
6564 struct bfd_link_info *info,
6565 void *flaginfo ATTRIBUTE_UNUSED,
6566 int (*func) (void *, const char *,
6567 Elf_Internal_Sym *,
6568 asection *,
6569 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
6570{
6571 struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
6572 if (htab == NULL)
6573 return FALSE;
6574
6575 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
6576 htab_traverse (htab->loc_hash_table,
6577 elf_x86_64_finish_local_dynamic_symbol,
6578 info);
6579
6580 return TRUE;
6581}
6582
6583/* Return an array of PLT entry symbol values. */
6584
6585static bfd_vma *
6586elf_x86_64_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
6587 asection *relplt)
6588{
6589 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
6590 arelent *p;
6591 long count, i;
6592 bfd_vma *plt_sym_val;
6593 bfd_vma plt_offset;
6594 bfd_byte *plt_contents;
6595 const struct elf_x86_64_backend_data *bed;
6596 Elf_Internal_Shdr *hdr;
6597 asection *plt_bnd;
6598
6599 /* Get the .plt section contents. PLT passed down may point to the
6600 .plt.bnd section. Make sure that PLT always points to the .plt
6601 section. */
6602 plt_bnd = bfd_get_section_by_name (abfd, ".plt.bnd");
6603 if (plt_bnd)
6604 {
6605 if (plt != plt_bnd)
6606 abort ();
6607 plt = bfd_get_section_by_name (abfd, ".plt");
6608 if (plt == NULL)
6609 abort ();
6610 bed = &elf_x86_64_bnd_arch_bed;
6611 }
6612 else
6613 bed = get_elf_x86_64_backend_data (abfd);
6614
6615 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
6616 if (plt_contents == NULL)
6617 return NULL;
6618 if (!bfd_get_section_contents (abfd, (asection *) plt,
6619 plt_contents, 0, plt->size))
6620 {
6621bad_return:
6622 free (plt_contents);
6623 return NULL;
6624 }
6625
6626 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
6627 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
6628 goto bad_return;
6629
6630 hdr = &elf_section_data (relplt)->this_hdr;
6631 count = relplt->size / hdr->sh_entsize;
6632
6633 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
6634 if (plt_sym_val == NULL)
6635 goto bad_return;
6636
6637 for (i = 0; i < count; i++)
6638 plt_sym_val[i] = -1;
6639
6640 plt_offset = bed->plt_entry_size;
6641 p = relplt->relocation;
6642 for (i = 0; i < count; i++, p++)
6643 {
6644 long reloc_index;
6645
6646 /* Skip unknown relocation. */
6647 if (p->howto == NULL)
6648 continue;
6649
6650 if (p->howto->type != R_X86_64_JUMP_SLOT
6651 && p->howto->type != R_X86_64_IRELATIVE)
6652 continue;
6653
6654 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
6655 + bed->plt_reloc_offset));
6656 if (reloc_index < count)
6657 {
6658 if (plt_bnd)
6659 {
6660 /* This is the index in .plt section. */
6661 long plt_index = plt_offset / bed->plt_entry_size;
6662 /* Store VMA + the offset in .plt.bnd section. */
6663 plt_sym_val[reloc_index] =
6664 (plt_bnd->vma
6665 + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
6666 }
6667 else
6668 plt_sym_val[reloc_index] = plt->vma + plt_offset;
6669 }
6670 plt_offset += bed->plt_entry_size;
6671
6672 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6673 section. */
6674 if (plt_offset >= plt->size)
6675 break;
6676 }
6677
6678 free (plt_contents);
6679
6680 return plt_sym_val;
6681}
6682
6683/* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6684 support. */
6685
6686static long
6687elf_x86_64_get_synthetic_symtab (bfd *abfd,
6688 long symcount,
6689 asymbol **syms,
6690 long dynsymcount,
6691 asymbol **dynsyms,
6692 asymbol **ret)
6693{
6694 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6695 as PLT if it exists. */
6696 asection *plt = bfd_get_section_by_name (abfd, ".plt.bnd");
6697 if (plt == NULL)
6698 plt = bfd_get_section_by_name (abfd, ".plt");
6699 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
6700 dynsymcount, dynsyms, ret,
6701 plt,
6702 elf_x86_64_get_plt_sym_val);
6703}
6704
6705/* Handle an x86-64 specific section when reading an object file. This
6706 is called when elfcode.h finds a section with an unknown type. */
6707
6708static bfd_boolean
6709elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
6710 const char *name, int shindex)
6711{
6712 if (hdr->sh_type != SHT_X86_64_UNWIND)
6713 return FALSE;
6714
6715 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
6716 return FALSE;
6717
6718 return TRUE;
6719}
6720
6721/* Hook called by the linker routine which adds symbols from an object
6722 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6723 of .bss. */
6724
6725static bfd_boolean
6726elf_x86_64_add_symbol_hook (bfd *abfd,
6727 struct bfd_link_info *info ATTRIBUTE_UNUSED,
6728 Elf_Internal_Sym *sym,
6729 const char **namep ATTRIBUTE_UNUSED,
6730 flagword *flagsp ATTRIBUTE_UNUSED,
6731 asection **secp,
6732 bfd_vma *valp)
6733{
6734 asection *lcomm;
6735
6736 switch (sym->st_shndx)
6737 {
6738 case SHN_X86_64_LCOMMON:
6739 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
6740 if (lcomm == NULL)
6741 {
6742 lcomm = bfd_make_section_with_flags (abfd,
6743 "LARGE_COMMON",
6744 (SEC_ALLOC
6745 | SEC_IS_COMMON
6746 | SEC_LINKER_CREATED));
6747 if (lcomm == NULL)
6748 return FALSE;
6749 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
6750 }
6751 *secp = lcomm;
6752 *valp = sym->st_size;
6753 return TRUE;
6754 }
6755
6756 return TRUE;
6757}
6758
6759
6760/* Given a BFD section, try to locate the corresponding ELF section
6761 index. */
6762
6763static bfd_boolean
6764elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
6765 asection *sec, int *index_return)
6766{
6767 if (sec == &_bfd_elf_large_com_section)
6768 {
6769 *index_return = SHN_X86_64_LCOMMON;
6770 return TRUE;
6771 }
6772 return FALSE;
6773}
6774
6775/* Process a symbol. */
6776
6777static void
6778elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
6779 asymbol *asym)
6780{
6781 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
6782
6783 switch (elfsym->internal_elf_sym.st_shndx)
6784 {
6785 case SHN_X86_64_LCOMMON:
6786 asym->section = &_bfd_elf_large_com_section;
6787 asym->value = elfsym->internal_elf_sym.st_size;
6788 /* Common symbol doesn't set BSF_GLOBAL. */
6789 asym->flags &= ~BSF_GLOBAL;
6790 break;
6791 }
6792}
6793
6794static bfd_boolean
6795elf_x86_64_common_definition (Elf_Internal_Sym *sym)
6796{
6797 return (sym->st_shndx == SHN_COMMON
6798 || sym->st_shndx == SHN_X86_64_LCOMMON);
6799}
6800
6801static unsigned int
6802elf_x86_64_common_section_index (asection *sec)
6803{
6804 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6805 return SHN_COMMON;
6806 else
6807 return SHN_X86_64_LCOMMON;
6808}
6809
6810static asection *
6811elf_x86_64_common_section (asection *sec)
6812{
6813 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6814 return bfd_com_section_ptr;
6815 else
6816 return &_bfd_elf_large_com_section;
6817}
6818
6819static bfd_boolean
6820elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
6821 const Elf_Internal_Sym *sym,
6822 asection **psec,
6823 bfd_boolean newdef,
6824 bfd_boolean olddef,
6825 bfd *oldbfd,
6826 const asection *oldsec)
6827{
6828 /* A normal common symbol and a large common symbol result in a
6829 normal common symbol. We turn the large common symbol into a
6830 normal one. */
6831 if (!olddef
6832 && h->root.type == bfd_link_hash_common
6833 && !newdef
6834 && bfd_is_com_section (*psec)
6835 && oldsec != *psec)
6836 {
6837 if (sym->st_shndx == SHN_COMMON
6838 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
6839 {
6840 h->root.u.c.p->section
6841 = bfd_make_section_old_way (oldbfd, "COMMON");
6842 h->root.u.c.p->section->flags = SEC_ALLOC;
6843 }
6844 else if (sym->st_shndx == SHN_X86_64_LCOMMON
6845 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
6846 *psec = bfd_com_section_ptr;
6847 }
6848
6849 return TRUE;
6850}
6851
6852static int
6853elf_x86_64_additional_program_headers (bfd *abfd,
6854 struct bfd_link_info *info ATTRIBUTE_UNUSED)
6855{
6856 asection *s;
6857 int count = 0;
6858
6859 /* Check to see if we need a large readonly segment. */
6860 s = bfd_get_section_by_name (abfd, ".lrodata");
6861 if (s && (s->flags & SEC_LOAD))
6862 count++;
6863
6864 /* Check to see if we need a large data segment. Since .lbss sections
6865 is placed right after the .bss section, there should be no need for
6866 a large data segment just because of .lbss. */
6867 s = bfd_get_section_by_name (abfd, ".ldata");
6868 if (s && (s->flags & SEC_LOAD))
6869 count++;
6870
6871 return count;
6872}
6873
6874/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6875
6876static bfd_boolean
6877elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
6878{
6879 if (h->plt.offset != (bfd_vma) -1
6880 && !h->def_regular
6881 && !h->pointer_equality_needed)
6882 return FALSE;
6883
6884 return _bfd_elf_hash_symbol (h);
6885}
6886
6887/* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6888
6889static bfd_boolean
6890elf_x86_64_relocs_compatible (const bfd_target *input,
6891 const bfd_target *output)
6892{
6893 return ((xvec_get_elf_backend_data (input)->s->elfclass
6894 == xvec_get_elf_backend_data (output)->s->elfclass)
6895 && _bfd_elf_relocs_compatible (input, output));
6896}
6897
6898/* Parse x86-64 GNU properties. */
6899
6900static enum elf_property_kind
6901elf_x86_64_parse_gnu_properties (bfd *abfd, unsigned int type,
6902 bfd_byte *ptr, unsigned int datasz)
6903{
6904 elf_property *prop;
6905
6906 switch (type)
6907 {
6908 case GNU_PROPERTY_X86_ISA_1_USED:
6909 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6910 if (datasz != 4)
6911 {
6912 _bfd_error_handler
6913 ((type == GNU_PROPERTY_X86_ISA_1_USED
6914 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
6915 : _("error: %B: <corrupt x86 ISA needed size: 0x%x>")),
6916 abfd, datasz);
6917 return property_corrupt;
6918 }
6919 prop = _bfd_elf_get_property (abfd, type, datasz);
6920 prop->u.number = bfd_h_get_32 (abfd, ptr);
6921 prop->pr_kind = property_number;
6922 break;
6923
6924 default:
6925 return property_ignored;
6926 }
6927
6928 return property_number;
6929}
6930
6931/* Merge x86-64 GNU property BPROP with APROP. If APROP isn't NULL,
6932 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
6933 should be merged with ABFD. */
6934
6935static bfd_boolean
6936elf_x86_64_merge_gnu_properties (bfd *abfd ATTRIBUTE_UNUSED,
6937 elf_property *aprop,
6938 elf_property *bprop)
6939{
6940 unsigned int number;
6941 bfd_boolean updated = FALSE;
6942 unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
6943
6944 switch (pr_type)
6945 {
6946 case GNU_PROPERTY_X86_ISA_1_USED:
6947 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6948 if (aprop != NULL && bprop != NULL)
6949 {
6950 number = aprop->u.number;
6951 aprop->u.number = number | bprop->u.number;
6952 updated = number != (unsigned int) aprop->u.number;
6953 }
6954 else
6955 {
6956 /* Return TRUE if APROP is NULL to indicate that BPROP should
6957 be added to ABFD. */
6958 updated = aprop == NULL;
6959 }
6960 break;
6961
6962 default:
6963 /* Never should happen. */
6964 abort ();
6965 }
6966
6967 return updated;
6968}
6969
6970static const struct bfd_elf_special_section
6971elf_x86_64_special_sections[]=
6972{
6973 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6974 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6975 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
6976 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6977 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6978 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6979 { NULL, 0, 0, 0, 0 }
6980};
6981
6982#define TARGET_LITTLE_SYM x86_64_elf64_vec
6983#define TARGET_LITTLE_NAME "elf64-x86-64"
6984#define ELF_ARCH bfd_arch_i386
6985#define ELF_TARGET_ID X86_64_ELF_DATA
6986#define ELF_MACHINE_CODE EM_X86_64
6987#define ELF_MAXPAGESIZE 0x200000
6988#define ELF_MINPAGESIZE 0x1000
6989#define ELF_COMMONPAGESIZE 0x1000
6990
6991#define elf_backend_can_gc_sections 1
6992#define elf_backend_can_refcount 1
6993#define elf_backend_want_got_plt 1
6994#define elf_backend_plt_readonly 1
6995#define elf_backend_want_plt_sym 0
6996#define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6997#define elf_backend_rela_normal 1
6998#define elf_backend_plt_alignment 4
6999#define elf_backend_extern_protected_data 1
7000#define elf_backend_caches_rawsize 1
7001#define elf_backend_dtrel_excludes_plt 1
7002#define elf_backend_want_dynrelro 1
7003
7004#define elf_info_to_howto elf_x86_64_info_to_howto
7005
7006#define bfd_elf64_bfd_link_hash_table_create \
7007 elf_x86_64_link_hash_table_create
7008#define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
7009#define bfd_elf64_bfd_reloc_name_lookup \
7010 elf_x86_64_reloc_name_lookup
7011
7012#define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
7013#define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
7014#define elf_backend_check_relocs elf_x86_64_check_relocs
7015#define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
7016#define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
7017#define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
7018#define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
7019#define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
7020#define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
7021#define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
7022#define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
7023#ifdef CORE_HEADER
7024#define elf_backend_write_core_note elf_x86_64_write_core_note
7025#endif
7026#define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
7027#define elf_backend_relocate_section elf_x86_64_relocate_section
7028#define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
7029#define elf_backend_always_size_sections elf_x86_64_always_size_sections
7030#define elf_backend_init_index_section _bfd_elf_init_1_index_section
7031#define elf_backend_object_p elf64_x86_64_elf_object_p
7032#define bfd_elf64_mkobject elf_x86_64_mkobject
7033#define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
7034
7035#define elf_backend_section_from_shdr \
7036 elf_x86_64_section_from_shdr
7037
7038#define elf_backend_section_from_bfd_section \
7039 elf_x86_64_elf_section_from_bfd_section
7040#define elf_backend_add_symbol_hook \
7041 elf_x86_64_add_symbol_hook
7042#define elf_backend_symbol_processing \
7043 elf_x86_64_symbol_processing
7044#define elf_backend_common_section_index \
7045 elf_x86_64_common_section_index
7046#define elf_backend_common_section \
7047 elf_x86_64_common_section
7048#define elf_backend_common_definition \
7049 elf_x86_64_common_definition
7050#define elf_backend_merge_symbol \
7051 elf_x86_64_merge_symbol
7052#define elf_backend_special_sections \
7053 elf_x86_64_special_sections
7054#define elf_backend_additional_program_headers \
7055 elf_x86_64_additional_program_headers
7056#define elf_backend_hash_symbol \
7057 elf_x86_64_hash_symbol
7058#define elf_backend_omit_section_dynsym \
7059 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
7060#define elf_backend_fixup_symbol \
7061 elf_x86_64_fixup_symbol
7062#define elf_backend_parse_gnu_properties \
7063 elf_x86_64_parse_gnu_properties
7064#define elf_backend_merge_gnu_properties \
7065 elf_x86_64_merge_gnu_properties
7066
7067#include "elf64-target.h"
7068
7069/* CloudABI support. */
7070
7071#undef TARGET_LITTLE_SYM
7072#define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
7073#undef TARGET_LITTLE_NAME
7074#define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
7075
7076#undef ELF_OSABI
7077#define ELF_OSABI ELFOSABI_CLOUDABI
7078
7079#undef elf64_bed
7080#define elf64_bed elf64_x86_64_cloudabi_bed
7081
7082#include "elf64-target.h"
7083
7084/* FreeBSD support. */
7085
7086#undef TARGET_LITTLE_SYM
7087#define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
7088#undef TARGET_LITTLE_NAME
7089#define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
7090
7091#undef ELF_OSABI
7092#define ELF_OSABI ELFOSABI_FREEBSD
7093
7094#undef elf64_bed
7095#define elf64_bed elf64_x86_64_fbsd_bed
7096
7097#include "elf64-target.h"
7098
7099/* Solaris 2 support. */
7100
7101#undef TARGET_LITTLE_SYM
7102#define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
7103#undef TARGET_LITTLE_NAME
7104#define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
7105
7106/* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
7107 objects won't be recognized. */
7108#undef ELF_OSABI
7109
7110#undef elf64_bed
7111#define elf64_bed elf64_x86_64_sol2_bed
7112
7113/* The 64-bit static TLS arena size is rounded to the nearest 16-byte
7114 boundary. */
7115#undef elf_backend_static_tls_alignment
7116#define elf_backend_static_tls_alignment 16
7117
7118/* The Solaris 2 ABI requires a plt symbol on all platforms.
7119
7120 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
7121 File, p.63. */
7122#undef elf_backend_want_plt_sym
7123#define elf_backend_want_plt_sym 1
7124
7125#undef elf_backend_strtab_flags
7126#define elf_backend_strtab_flags SHF_STRINGS
7127
7128static bfd_boolean
7129elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
7130 bfd *obfd ATTRIBUTE_UNUSED,
7131 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
7132 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
7133{
7134 /* PR 19938: FIXME: Need to add code for setting the sh_info
7135 and sh_link fields of Solaris specific section types. */
7136 return FALSE;
7137}
7138
7139#undef elf_backend_copy_special_section_fields
7140#define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
7141
7142#include "elf64-target.h"
7143
7144/* Native Client support. */
7145
7146static bfd_boolean
7147elf64_x86_64_nacl_elf_object_p (bfd *abfd)
7148{
7149 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
7150 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
7151 return TRUE;
7152}
7153
7154#undef TARGET_LITTLE_SYM
7155#define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
7156#undef TARGET_LITTLE_NAME
7157#define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
7158#undef elf64_bed
7159#define elf64_bed elf64_x86_64_nacl_bed
7160
7161#undef ELF_MAXPAGESIZE
7162#undef ELF_MINPAGESIZE
7163#undef ELF_COMMONPAGESIZE
7164#define ELF_MAXPAGESIZE 0x10000
7165#define ELF_MINPAGESIZE 0x10000
7166#define ELF_COMMONPAGESIZE 0x10000
7167
7168/* Restore defaults. */
7169#undef ELF_OSABI
7170#undef elf_backend_static_tls_alignment
7171#undef elf_backend_want_plt_sym
7172#define elf_backend_want_plt_sym 0
7173#undef elf_backend_strtab_flags
7174#undef elf_backend_copy_special_section_fields
7175
7176/* NaCl uses substantially different PLT entries for the same effects. */
7177
7178#undef elf_backend_plt_alignment
7179#define elf_backend_plt_alignment 5
7180#define NACL_PLT_ENTRY_SIZE 64
7181#define NACLMASK 0xe0 /* 32-byte alignment mask. */
7182
7183static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
7184 {
7185 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
7186 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
7187 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
7188 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
7189 0x41, 0xff, 0xe3, /* jmpq *%r11 */
7190
7191 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
7192 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
7193
7194 /* 32 bytes of nop to pad out to the standard size. */
7195 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7196 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7197 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7198 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7199 0x66, /* excess data16 prefix */
7200 0x90 /* nop */
7201 };
7202
7203static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
7204 {
7205 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
7206 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
7207 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
7208 0x41, 0xff, 0xe3, /* jmpq *%r11 */
7209
7210 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
7211 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7212 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7213
7214 /* Lazy GOT entries point here (32-byte aligned). */
7215 0x68, /* pushq immediate */
7216 0, 0, 0, 0, /* replaced with index into relocation table. */
7217 0xe9, /* jmp relative */
7218 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
7219
7220 /* 22 bytes of nop to pad out to the standard size. */
7221 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7222 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7223 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
7224 };
7225
7226/* .eh_frame covering the .plt section. */
7227
7228static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
7229 {
7230#if (PLT_CIE_LENGTH != 20 \
7231 || PLT_FDE_LENGTH != 36 \
7232 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
7233 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
7234# error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
7235#endif
7236 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
7237 0, 0, 0, 0, /* CIE ID */
7238 1, /* CIE version */
7239 'z', 'R', 0, /* Augmentation string */
7240 1, /* Code alignment factor */
7241 0x78, /* Data alignment factor */
7242 16, /* Return address column */
7243 1, /* Augmentation size */
7244 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
7245 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
7246 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
7247 DW_CFA_nop, DW_CFA_nop,
7248
7249 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
7250 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
7251 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
7252 0, 0, 0, 0, /* .plt size goes here */
7253 0, /* Augmentation size */
7254 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
7255 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
7256 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
7257 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
7258 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
7259 13, /* Block length */
7260 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
7261 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
7262 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
7263 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
7264 DW_CFA_nop, DW_CFA_nop
7265 };
7266
7267static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
7268 {
7269 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
7270 elf_x86_64_nacl_plt_entry, /* plt_entry */
7271 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
7272 2, /* plt0_got1_offset */
7273 9, /* plt0_got2_offset */
7274 13, /* plt0_got2_insn_end */
7275 3, /* plt_got_offset */
7276 33, /* plt_reloc_offset */
7277 38, /* plt_plt_offset */
7278 7, /* plt_got_insn_size */
7279 42, /* plt_plt_insn_end */
7280 32, /* plt_lazy_offset */
7281 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
7282 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
7283 NULL, /* eh_frame_plt_got */
7284 0, /* eh_frame_plt_got_size */
7285 };
7286
7287#undef elf_backend_arch_data
7288#define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
7289
7290#undef elf_backend_object_p
7291#define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
7292#undef elf_backend_modify_segment_map
7293#define elf_backend_modify_segment_map nacl_modify_segment_map
7294#undef elf_backend_modify_program_headers
7295#define elf_backend_modify_program_headers nacl_modify_program_headers
7296#undef elf_backend_final_write_processing
7297#define elf_backend_final_write_processing nacl_final_write_processing
7298
7299#include "elf64-target.h"
7300
7301/* Native Client x32 support. */
7302
7303static bfd_boolean
7304elf32_x86_64_nacl_elf_object_p (bfd *abfd)
7305{
7306 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
7307 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
7308 return TRUE;
7309}
7310
7311#undef TARGET_LITTLE_SYM
7312#define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
7313#undef TARGET_LITTLE_NAME
7314#define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
7315#undef elf32_bed
7316#define elf32_bed elf32_x86_64_nacl_bed
7317
7318#define bfd_elf32_bfd_link_hash_table_create \
7319 elf_x86_64_link_hash_table_create
7320#define bfd_elf32_bfd_reloc_type_lookup \
7321 elf_x86_64_reloc_type_lookup
7322#define bfd_elf32_bfd_reloc_name_lookup \
7323 elf_x86_64_reloc_name_lookup
7324#define bfd_elf32_mkobject \
7325 elf_x86_64_mkobject
7326#define bfd_elf32_get_synthetic_symtab \
7327 elf_x86_64_get_synthetic_symtab
7328
7329#undef elf_backend_object_p
7330#define elf_backend_object_p \
7331 elf32_x86_64_nacl_elf_object_p
7332
7333#undef elf_backend_bfd_from_remote_memory
7334#define elf_backend_bfd_from_remote_memory \
7335 _bfd_elf32_bfd_from_remote_memory
7336
7337#undef elf_backend_size_info
7338#define elf_backend_size_info \
7339 _bfd_elf32_size_info
7340
7341#include "elf32-target.h"
7342
7343/* Restore defaults. */
7344#undef elf_backend_object_p
7345#define elf_backend_object_p elf64_x86_64_elf_object_p
7346#undef elf_backend_bfd_from_remote_memory
7347#undef elf_backend_size_info
7348#undef elf_backend_modify_segment_map
7349#undef elf_backend_modify_program_headers
7350#undef elf_backend_final_write_processing
7351
7352/* Intel L1OM support. */
7353
7354static bfd_boolean
7355elf64_l1om_elf_object_p (bfd *abfd)
7356{
7357 /* Set the right machine number for an L1OM elf64 file. */
7358 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
7359 return TRUE;
7360}
7361
7362#undef TARGET_LITTLE_SYM
7363#define TARGET_LITTLE_SYM l1om_elf64_vec
7364#undef TARGET_LITTLE_NAME
7365#define TARGET_LITTLE_NAME "elf64-l1om"
7366#undef ELF_ARCH
7367#define ELF_ARCH bfd_arch_l1om
7368
7369#undef ELF_MACHINE_CODE
7370#define ELF_MACHINE_CODE EM_L1OM
7371
7372#undef ELF_OSABI
7373
7374#undef elf64_bed
7375#define elf64_bed elf64_l1om_bed
7376
7377#undef elf_backend_object_p
7378#define elf_backend_object_p elf64_l1om_elf_object_p
7379
7380/* Restore defaults. */
7381#undef ELF_MAXPAGESIZE
7382#undef ELF_MINPAGESIZE
7383#undef ELF_COMMONPAGESIZE
7384#define ELF_MAXPAGESIZE 0x200000
7385#define ELF_MINPAGESIZE 0x1000
7386#define ELF_COMMONPAGESIZE 0x1000
7387#undef elf_backend_plt_alignment
7388#define elf_backend_plt_alignment 4
7389#undef elf_backend_arch_data
7390#define elf_backend_arch_data &elf_x86_64_arch_bed
7391
7392#include "elf64-target.h"
7393
7394/* FreeBSD L1OM support. */
7395
7396#undef TARGET_LITTLE_SYM
7397#define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
7398#undef TARGET_LITTLE_NAME
7399#define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
7400
7401#undef ELF_OSABI
7402#define ELF_OSABI ELFOSABI_FREEBSD
7403
7404#undef elf64_bed
7405#define elf64_bed elf64_l1om_fbsd_bed
7406
7407#include "elf64-target.h"
7408
7409/* Intel K1OM support. */
7410
7411static bfd_boolean
7412elf64_k1om_elf_object_p (bfd *abfd)
7413{
7414 /* Set the right machine number for an K1OM elf64 file. */
7415 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
7416 return TRUE;
7417}
7418
7419#undef TARGET_LITTLE_SYM
7420#define TARGET_LITTLE_SYM k1om_elf64_vec
7421#undef TARGET_LITTLE_NAME
7422#define TARGET_LITTLE_NAME "elf64-k1om"
7423#undef ELF_ARCH
7424#define ELF_ARCH bfd_arch_k1om
7425
7426#undef ELF_MACHINE_CODE
7427#define ELF_MACHINE_CODE EM_K1OM
7428
7429#undef ELF_OSABI
7430
7431#undef elf64_bed
7432#define elf64_bed elf64_k1om_bed
7433
7434#undef elf_backend_object_p
7435#define elf_backend_object_p elf64_k1om_elf_object_p
7436
7437#undef elf_backend_static_tls_alignment
7438
7439#undef elf_backend_want_plt_sym
7440#define elf_backend_want_plt_sym 0
7441
7442#include "elf64-target.h"
7443
7444/* FreeBSD K1OM support. */
7445
7446#undef TARGET_LITTLE_SYM
7447#define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
7448#undef TARGET_LITTLE_NAME
7449#define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
7450
7451#undef ELF_OSABI
7452#define ELF_OSABI ELFOSABI_FREEBSD
7453
7454#undef elf64_bed
7455#define elf64_bed elf64_k1om_fbsd_bed
7456
7457#include "elf64-target.h"
7458
7459/* 32bit x86-64 support. */
7460
7461#undef TARGET_LITTLE_SYM
7462#define TARGET_LITTLE_SYM x86_64_elf32_vec
7463#undef TARGET_LITTLE_NAME
7464#define TARGET_LITTLE_NAME "elf32-x86-64"
7465#undef elf32_bed
7466
7467#undef ELF_ARCH
7468#define ELF_ARCH bfd_arch_i386
7469
7470#undef ELF_MACHINE_CODE
7471#define ELF_MACHINE_CODE EM_X86_64
7472
7473#undef ELF_OSABI
7474
7475#undef elf_backend_object_p
7476#define elf_backend_object_p \
7477 elf32_x86_64_elf_object_p
7478
7479#undef elf_backend_bfd_from_remote_memory
7480#define elf_backend_bfd_from_remote_memory \
7481 _bfd_elf32_bfd_from_remote_memory
7482
7483#undef elf_backend_size_info
7484#define elf_backend_size_info \
7485 _bfd_elf32_size_info
7486
7487#include "elf32-target.h"
GDB Binutils - Deliverables
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