Set plt_got.offset to (bfd_vma) -1
[binutils-gdb.git] / bfd / elf64-x86-64.c
1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2016 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. */
56 static 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. */
217 struct elf_reloc_map
218 {
219 bfd_reloc_code_real_type bfd_reloc_val;
220 unsigned char elf_reloc_val;
221 };
222
223 static 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
271 static reloc_howto_type *
272 elf_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 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
289 abfd, (int) r_type);
290 r_type = R_X86_64_NONE;
291 }
292 i = r_type;
293 }
294 else
295 i = r_type - (unsigned int) R_X86_64_vt_offset;
296 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
297 return &x86_64_elf_howto_table[i];
298 }
299
300 /* Given a BFD reloc type, return a HOWTO structure. */
301 static reloc_howto_type *
302 elf_x86_64_reloc_type_lookup (bfd *abfd,
303 bfd_reloc_code_real_type code)
304 {
305 unsigned int i;
306
307 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
308 i++)
309 {
310 if (x86_64_reloc_map[i].bfd_reloc_val == code)
311 return elf_x86_64_rtype_to_howto (abfd,
312 x86_64_reloc_map[i].elf_reloc_val);
313 }
314 return NULL;
315 }
316
317 static reloc_howto_type *
318 elf_x86_64_reloc_name_lookup (bfd *abfd,
319 const char *r_name)
320 {
321 unsigned int i;
322
323 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
324 {
325 /* Get x32 R_X86_64_32. */
326 reloc_howto_type *reloc
327 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
328 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
329 return reloc;
330 }
331
332 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
333 if (x86_64_elf_howto_table[i].name != NULL
334 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
335 return &x86_64_elf_howto_table[i];
336
337 return NULL;
338 }
339
340 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
341
342 static void
343 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
344 Elf_Internal_Rela *dst)
345 {
346 unsigned r_type;
347
348 r_type = ELF32_R_TYPE (dst->r_info);
349 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
350 BFD_ASSERT (r_type == cache_ptr->howto->type);
351 }
352 \f
353 /* Support for core dump NOTE sections. */
354 static bfd_boolean
355 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
356 {
357 int offset;
358 size_t size;
359
360 switch (note->descsz)
361 {
362 default:
363 return FALSE;
364
365 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
366 /* pr_cursig */
367 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
368
369 /* pr_pid */
370 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
371
372 /* pr_reg */
373 offset = 72;
374 size = 216;
375
376 break;
377
378 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
379 /* pr_cursig */
380 elf_tdata (abfd)->core->signal
381 = bfd_get_16 (abfd, note->descdata + 12);
382
383 /* pr_pid */
384 elf_tdata (abfd)->core->lwpid
385 = bfd_get_32 (abfd, note->descdata + 32);
386
387 /* pr_reg */
388 offset = 112;
389 size = 216;
390
391 break;
392 }
393
394 /* Make a ".reg/999" section. */
395 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
396 size, note->descpos + offset);
397 }
398
399 static bfd_boolean
400 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
401 {
402 switch (note->descsz)
403 {
404 default:
405 return FALSE;
406
407 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
408 elf_tdata (abfd)->core->pid
409 = bfd_get_32 (abfd, note->descdata + 12);
410 elf_tdata (abfd)->core->program
411 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
412 elf_tdata (abfd)->core->command
413 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
414 break;
415
416 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
417 elf_tdata (abfd)->core->pid
418 = bfd_get_32 (abfd, note->descdata + 24);
419 elf_tdata (abfd)->core->program
420 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
421 elf_tdata (abfd)->core->command
422 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
423 }
424
425 /* Note that for some reason, a spurious space is tacked
426 onto the end of the args in some (at least one anyway)
427 implementations, so strip it off if it exists. */
428
429 {
430 char *command = elf_tdata (abfd)->core->command;
431 int n = strlen (command);
432
433 if (0 < n && command[n - 1] == ' ')
434 command[n - 1] = '\0';
435 }
436
437 return TRUE;
438 }
439
440 #ifdef CORE_HEADER
441 static char *
442 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
443 int note_type, ...)
444 {
445 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
446 va_list ap;
447 const char *fname, *psargs;
448 long pid;
449 int cursig;
450 const void *gregs;
451
452 switch (note_type)
453 {
454 default:
455 return NULL;
456
457 case NT_PRPSINFO:
458 va_start (ap, note_type);
459 fname = va_arg (ap, const char *);
460 psargs = va_arg (ap, const char *);
461 va_end (ap);
462
463 if (bed->s->elfclass == ELFCLASS32)
464 {
465 prpsinfo32_t data;
466 memset (&data, 0, sizeof (data));
467 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
468 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
469 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
470 &data, sizeof (data));
471 }
472 else
473 {
474 prpsinfo64_t data;
475 memset (&data, 0, sizeof (data));
476 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
477 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
478 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
479 &data, sizeof (data));
480 }
481 /* NOTREACHED */
482
483 case NT_PRSTATUS:
484 va_start (ap, note_type);
485 pid = va_arg (ap, long);
486 cursig = va_arg (ap, int);
487 gregs = va_arg (ap, const void *);
488 va_end (ap);
489
490 if (bed->s->elfclass == ELFCLASS32)
491 {
492 if (bed->elf_machine_code == EM_X86_64)
493 {
494 prstatusx32_t prstat;
495 memset (&prstat, 0, sizeof (prstat));
496 prstat.pr_pid = pid;
497 prstat.pr_cursig = cursig;
498 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
499 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
500 &prstat, sizeof (prstat));
501 }
502 else
503 {
504 prstatus32_t prstat;
505 memset (&prstat, 0, sizeof (prstat));
506 prstat.pr_pid = pid;
507 prstat.pr_cursig = cursig;
508 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
509 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
510 &prstat, sizeof (prstat));
511 }
512 }
513 else
514 {
515 prstatus64_t prstat;
516 memset (&prstat, 0, sizeof (prstat));
517 prstat.pr_pid = pid;
518 prstat.pr_cursig = cursig;
519 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
520 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
521 &prstat, sizeof (prstat));
522 }
523 }
524 /* NOTREACHED */
525 }
526 #endif
527 \f
528 /* Functions for the x86-64 ELF linker. */
529
530 /* The name of the dynamic interpreter. This is put in the .interp
531 section. */
532
533 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
534 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
535
536 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
537 copying dynamic variables from a shared lib into an app's dynbss
538 section, and instead use a dynamic relocation to point into the
539 shared lib. */
540 #define ELIMINATE_COPY_RELOCS 1
541
542 /* The size in bytes of an entry in the global offset table. */
543
544 #define GOT_ENTRY_SIZE 8
545
546 /* The size in bytes of an entry in the procedure linkage table. */
547
548 #define PLT_ENTRY_SIZE 16
549
550 /* The first entry in a procedure linkage table looks like this. See the
551 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
552
553 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
554 {
555 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
556 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
557 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
558 };
559
560 /* Subsequent entries in a procedure linkage table look like this. */
561
562 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
563 {
564 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
565 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
566 0x68, /* pushq immediate */
567 0, 0, 0, 0, /* replaced with index into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
570 };
571
572 /* The first entry in a procedure linkage table with BND relocations
573 like this. */
574
575 static const bfd_byte elf_x86_64_bnd_plt0_entry[PLT_ENTRY_SIZE] =
576 {
577 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
578 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
579 0x0f, 0x1f, 0 /* nopl (%rax) */
580 };
581
582 /* Subsequent entries for legacy branches in a procedure linkage table
583 with BND relocations look like this. */
584
585 static const bfd_byte elf_x86_64_legacy_plt_entry[PLT_ENTRY_SIZE] =
586 {
587 0x68, 0, 0, 0, 0, /* pushq immediate */
588 0xe9, 0, 0, 0, 0, /* jmpq relative */
589 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
590 };
591
592 /* Subsequent entries for branches with BND prefx in a procedure linkage
593 table with BND relocations look like this. */
594
595 static const bfd_byte elf_x86_64_bnd_plt_entry[PLT_ENTRY_SIZE] =
596 {
597 0x68, 0, 0, 0, 0, /* pushq immediate */
598 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
599 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
600 };
601
602 /* Entries for legacy branches in the second procedure linkage table
603 look like this. */
604
605 static const bfd_byte elf_x86_64_legacy_plt2_entry[8] =
606 {
607 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
608 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
610 };
611
612 /* Entries for branches with BND prefix in the second procedure linkage
613 table look like this. */
614
615 static const bfd_byte elf_x86_64_bnd_plt2_entry[8] =
616 {
617 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
618 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
619 0x90 /* nop */
620 };
621
622 /* .eh_frame covering the .plt section. */
623
624 static const bfd_byte elf_x86_64_eh_frame_plt[] =
625 {
626 #define PLT_CIE_LENGTH 20
627 #define PLT_FDE_LENGTH 36
628 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
629 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
630 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
631 0, 0, 0, 0, /* CIE ID */
632 1, /* CIE version */
633 'z', 'R', 0, /* Augmentation string */
634 1, /* Code alignment factor */
635 0x78, /* Data alignment factor */
636 16, /* Return address column */
637 1, /* Augmentation size */
638 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
639 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
640 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
641 DW_CFA_nop, DW_CFA_nop,
642
643 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
644 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
645 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
646 0, 0, 0, 0, /* .plt size goes here */
647 0, /* Augmentation size */
648 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
649 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
650 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
651 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
652 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
653 11, /* Block length */
654 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
655 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
656 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
657 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
658 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
659 };
660
661 /* Architecture-specific backend data for x86-64. */
662
663 struct elf_x86_64_backend_data
664 {
665 /* Templates for the initial PLT entry and for subsequent entries. */
666 const bfd_byte *plt0_entry;
667 const bfd_byte *plt_entry;
668 unsigned int plt_entry_size; /* Size of each PLT entry. */
669
670 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
671 unsigned int plt0_got1_offset;
672 unsigned int plt0_got2_offset;
673
674 /* Offset of the end of the PC-relative instruction containing
675 plt0_got2_offset. */
676 unsigned int plt0_got2_insn_end;
677
678 /* Offsets into plt_entry that are to be replaced with... */
679 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
680 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
681 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
682
683 /* Length of the PC-relative instruction containing plt_got_offset. */
684 unsigned int plt_got_insn_size;
685
686 /* Offset of the end of the PC-relative jump to plt0_entry. */
687 unsigned int plt_plt_insn_end;
688
689 /* Offset into plt_entry where the initial value of the GOT entry points. */
690 unsigned int plt_lazy_offset;
691
692 /* .eh_frame covering the .plt section. */
693 const bfd_byte *eh_frame_plt;
694 unsigned int eh_frame_plt_size;
695 };
696
697 #define get_elf_x86_64_arch_data(bed) \
698 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
699
700 #define get_elf_x86_64_backend_data(abfd) \
701 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
702
703 #define GET_PLT_ENTRY_SIZE(abfd) \
704 get_elf_x86_64_backend_data (abfd)->plt_entry_size
705
706 /* These are the standard parameters. */
707 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
708 {
709 elf_x86_64_plt0_entry, /* plt0_entry */
710 elf_x86_64_plt_entry, /* plt_entry */
711 sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
712 2, /* plt0_got1_offset */
713 8, /* plt0_got2_offset */
714 12, /* plt0_got2_insn_end */
715 2, /* plt_got_offset */
716 7, /* plt_reloc_offset */
717 12, /* plt_plt_offset */
718 6, /* plt_got_insn_size */
719 PLT_ENTRY_SIZE, /* plt_plt_insn_end */
720 6, /* plt_lazy_offset */
721 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
722 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
723 };
724
725 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed =
726 {
727 elf_x86_64_bnd_plt0_entry, /* plt0_entry */
728 elf_x86_64_bnd_plt_entry, /* plt_entry */
729 sizeof (elf_x86_64_bnd_plt_entry), /* plt_entry_size */
730 2, /* plt0_got1_offset */
731 1+8, /* plt0_got2_offset */
732 1+12, /* plt0_got2_insn_end */
733 1+2, /* plt_got_offset */
734 1, /* plt_reloc_offset */
735 7, /* plt_plt_offset */
736 1+6, /* plt_got_insn_size */
737 11, /* plt_plt_insn_end */
738 0, /* plt_lazy_offset */
739 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
740 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
741 };
742
743 #define elf_backend_arch_data &elf_x86_64_arch_bed
744
745 /* x86-64 ELF linker hash entry. */
746
747 struct elf_x86_64_link_hash_entry
748 {
749 struct elf_link_hash_entry elf;
750
751 /* Track dynamic relocs copied for this symbol. */
752 struct elf_dyn_relocs *dyn_relocs;
753
754 #define GOT_UNKNOWN 0
755 #define GOT_NORMAL 1
756 #define GOT_TLS_GD 2
757 #define GOT_TLS_IE 3
758 #define GOT_TLS_GDESC 4
759 #define GOT_TLS_GD_BOTH_P(type) \
760 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
761 #define GOT_TLS_GD_P(type) \
762 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
763 #define GOT_TLS_GDESC_P(type) \
764 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
765 #define GOT_TLS_GD_ANY_P(type) \
766 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
767 unsigned char tls_type;
768
769 /* TRUE if a weak symbol with a real definition needs a copy reloc.
770 When there is a weak symbol with a real definition, the processor
771 independent code will have arranged for us to see the real
772 definition first. We need to copy the needs_copy bit from the
773 real definition and check it when allowing copy reloc in PIE. */
774 unsigned int needs_copy : 1;
775
776 /* TRUE if symbol has at least one BND relocation. */
777 unsigned int has_bnd_reloc : 1;
778
779 /* Reference count of C/C++ function pointer relocations in read-write
780 section which can be resolved at run-time. */
781 bfd_signed_vma func_pointer_refcount;
782
783 /* Information about the GOT PLT entry. Filled when there are both
784 GOT and PLT relocations against the same function. */
785 union gotplt_union plt_got;
786
787 /* Information about the second PLT entry. Filled when has_bnd_reloc is
788 set. */
789 union gotplt_union plt_bnd;
790
791 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
792 starting at the end of the jump table. */
793 bfd_vma tlsdesc_got;
794 };
795
796 #define elf_x86_64_hash_entry(ent) \
797 ((struct elf_x86_64_link_hash_entry *)(ent))
798
799 struct elf_x86_64_obj_tdata
800 {
801 struct elf_obj_tdata root;
802
803 /* tls_type for each local got entry. */
804 char *local_got_tls_type;
805
806 /* GOTPLT entries for TLS descriptors. */
807 bfd_vma *local_tlsdesc_gotent;
808 };
809
810 #define elf_x86_64_tdata(abfd) \
811 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
812
813 #define elf_x86_64_local_got_tls_type(abfd) \
814 (elf_x86_64_tdata (abfd)->local_got_tls_type)
815
816 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
817 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
818
819 #define is_x86_64_elf(bfd) \
820 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
821 && elf_tdata (bfd) != NULL \
822 && elf_object_id (bfd) == X86_64_ELF_DATA)
823
824 static bfd_boolean
825 elf_x86_64_mkobject (bfd *abfd)
826 {
827 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
828 X86_64_ELF_DATA);
829 }
830
831 /* x86-64 ELF linker hash table. */
832
833 struct elf_x86_64_link_hash_table
834 {
835 struct elf_link_hash_table elf;
836
837 /* Short-cuts to get to dynamic linker sections. */
838 asection *sdynbss;
839 asection *srelbss;
840 asection *plt_eh_frame;
841 asection *plt_bnd;
842 asection *plt_got;
843
844 union
845 {
846 bfd_signed_vma refcount;
847 bfd_vma offset;
848 } tls_ld_got;
849
850 /* The amount of space used by the jump slots in the GOT. */
851 bfd_vma sgotplt_jump_table_size;
852
853 /* Small local sym cache. */
854 struct sym_cache sym_cache;
855
856 bfd_vma (*r_info) (bfd_vma, bfd_vma);
857 bfd_vma (*r_sym) (bfd_vma);
858 unsigned int pointer_r_type;
859 const char *dynamic_interpreter;
860 int dynamic_interpreter_size;
861
862 /* _TLS_MODULE_BASE_ symbol. */
863 struct bfd_link_hash_entry *tls_module_base;
864
865 /* Used by local STT_GNU_IFUNC symbols. */
866 htab_t loc_hash_table;
867 void * loc_hash_memory;
868
869 /* The offset into splt of the PLT entry for the TLS descriptor
870 resolver. Special values are 0, if not necessary (or not found
871 to be necessary yet), and -1 if needed but not determined
872 yet. */
873 bfd_vma tlsdesc_plt;
874 /* The offset into sgot of the GOT entry used by the PLT entry
875 above. */
876 bfd_vma tlsdesc_got;
877
878 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
879 bfd_vma next_jump_slot_index;
880 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
881 bfd_vma next_irelative_index;
882 };
883
884 /* Get the x86-64 ELF linker hash table from a link_info structure. */
885
886 #define elf_x86_64_hash_table(p) \
887 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
888 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
889
890 #define elf_x86_64_compute_jump_table_size(htab) \
891 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
892
893 /* Create an entry in an x86-64 ELF linker hash table. */
894
895 static struct bfd_hash_entry *
896 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
897 struct bfd_hash_table *table,
898 const char *string)
899 {
900 /* Allocate the structure if it has not already been allocated by a
901 subclass. */
902 if (entry == NULL)
903 {
904 entry = (struct bfd_hash_entry *)
905 bfd_hash_allocate (table,
906 sizeof (struct elf_x86_64_link_hash_entry));
907 if (entry == NULL)
908 return entry;
909 }
910
911 /* Call the allocation method of the superclass. */
912 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
913 if (entry != NULL)
914 {
915 struct elf_x86_64_link_hash_entry *eh;
916
917 eh = (struct elf_x86_64_link_hash_entry *) entry;
918 eh->dyn_relocs = NULL;
919 eh->tls_type = GOT_UNKNOWN;
920 eh->needs_copy = 0;
921 eh->has_bnd_reloc = 0;
922 eh->func_pointer_refcount = 0;
923 eh->plt_bnd.offset = (bfd_vma) -1;
924 eh->plt_got.offset = (bfd_vma) -1;
925 eh->tlsdesc_got = (bfd_vma) -1;
926 }
927
928 return entry;
929 }
930
931 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
932 for local symbol so that we can handle local STT_GNU_IFUNC symbols
933 as global symbol. We reuse indx and dynstr_index for local symbol
934 hash since they aren't used by global symbols in this backend. */
935
936 static hashval_t
937 elf_x86_64_local_htab_hash (const void *ptr)
938 {
939 struct elf_link_hash_entry *h
940 = (struct elf_link_hash_entry *) ptr;
941 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
942 }
943
944 /* Compare local hash entries. */
945
946 static int
947 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
948 {
949 struct elf_link_hash_entry *h1
950 = (struct elf_link_hash_entry *) ptr1;
951 struct elf_link_hash_entry *h2
952 = (struct elf_link_hash_entry *) ptr2;
953
954 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
955 }
956
957 /* Find and/or create a hash entry for local symbol. */
958
959 static struct elf_link_hash_entry *
960 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
961 bfd *abfd, const Elf_Internal_Rela *rel,
962 bfd_boolean create)
963 {
964 struct elf_x86_64_link_hash_entry e, *ret;
965 asection *sec = abfd->sections;
966 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
967 htab->r_sym (rel->r_info));
968 void **slot;
969
970 e.elf.indx = sec->id;
971 e.elf.dynstr_index = htab->r_sym (rel->r_info);
972 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
973 create ? INSERT : NO_INSERT);
974
975 if (!slot)
976 return NULL;
977
978 if (*slot)
979 {
980 ret = (struct elf_x86_64_link_hash_entry *) *slot;
981 return &ret->elf;
982 }
983
984 ret = (struct elf_x86_64_link_hash_entry *)
985 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
986 sizeof (struct elf_x86_64_link_hash_entry));
987 if (ret)
988 {
989 memset (ret, 0, sizeof (*ret));
990 ret->elf.indx = sec->id;
991 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
992 ret->elf.dynindx = -1;
993 ret->func_pointer_refcount = 0;
994 ret->plt_got.offset = (bfd_vma) -1;
995 *slot = ret;
996 }
997 return &ret->elf;
998 }
999
1000 /* Destroy an X86-64 ELF linker hash table. */
1001
1002 static void
1003 elf_x86_64_link_hash_table_free (bfd *obfd)
1004 {
1005 struct elf_x86_64_link_hash_table *htab
1006 = (struct elf_x86_64_link_hash_table *) obfd->link.hash;
1007
1008 if (htab->loc_hash_table)
1009 htab_delete (htab->loc_hash_table);
1010 if (htab->loc_hash_memory)
1011 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1012 _bfd_elf_link_hash_table_free (obfd);
1013 }
1014
1015 /* Create an X86-64 ELF linker hash table. */
1016
1017 static struct bfd_link_hash_table *
1018 elf_x86_64_link_hash_table_create (bfd *abfd)
1019 {
1020 struct elf_x86_64_link_hash_table *ret;
1021 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
1022
1023 ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt);
1024 if (ret == NULL)
1025 return NULL;
1026
1027 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1028 elf_x86_64_link_hash_newfunc,
1029 sizeof (struct elf_x86_64_link_hash_entry),
1030 X86_64_ELF_DATA))
1031 {
1032 free (ret);
1033 return NULL;
1034 }
1035
1036 if (ABI_64_P (abfd))
1037 {
1038 ret->r_info = elf64_r_info;
1039 ret->r_sym = elf64_r_sym;
1040 ret->pointer_r_type = R_X86_64_64;
1041 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
1042 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
1043 }
1044 else
1045 {
1046 ret->r_info = elf32_r_info;
1047 ret->r_sym = elf32_r_sym;
1048 ret->pointer_r_type = R_X86_64_32;
1049 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
1050 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
1051 }
1052
1053 ret->loc_hash_table = htab_try_create (1024,
1054 elf_x86_64_local_htab_hash,
1055 elf_x86_64_local_htab_eq,
1056 NULL);
1057 ret->loc_hash_memory = objalloc_create ();
1058 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1059 {
1060 elf_x86_64_link_hash_table_free (abfd);
1061 return NULL;
1062 }
1063 ret->elf.root.hash_table_free = elf_x86_64_link_hash_table_free;
1064
1065 return &ret->elf.root;
1066 }
1067
1068 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1069 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1070 hash table. */
1071
1072 static bfd_boolean
1073 elf_x86_64_create_dynamic_sections (bfd *dynobj,
1074 struct bfd_link_info *info)
1075 {
1076 struct elf_x86_64_link_hash_table *htab;
1077
1078 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1079 return FALSE;
1080
1081 htab = elf_x86_64_hash_table (info);
1082 if (htab == NULL)
1083 return FALSE;
1084
1085 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1086 if (!htab->sdynbss)
1087 abort ();
1088
1089 if (bfd_link_executable (info))
1090 {
1091 /* Always allow copy relocs for building executables. */
1092 asection *s = bfd_get_linker_section (dynobj, ".rela.bss");
1093 if (s == NULL)
1094 {
1095 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1096 s = bfd_make_section_anyway_with_flags (dynobj,
1097 ".rela.bss",
1098 (bed->dynamic_sec_flags
1099 | SEC_READONLY));
1100 if (s == NULL
1101 || ! bfd_set_section_alignment (dynobj, s,
1102 bed->s->log_file_align))
1103 return FALSE;
1104 }
1105 htab->srelbss = s;
1106 }
1107
1108 if (!info->no_ld_generated_unwind_info
1109 && htab->plt_eh_frame == NULL
1110 && htab->elf.splt != NULL)
1111 {
1112 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1113 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1114 | SEC_LINKER_CREATED);
1115 htab->plt_eh_frame
1116 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1117 if (htab->plt_eh_frame == NULL
1118 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
1119 return FALSE;
1120 }
1121 return TRUE;
1122 }
1123
1124 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1125
1126 static void
1127 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1128 struct elf_link_hash_entry *dir,
1129 struct elf_link_hash_entry *ind)
1130 {
1131 struct elf_x86_64_link_hash_entry *edir, *eind;
1132
1133 edir = (struct elf_x86_64_link_hash_entry *) dir;
1134 eind = (struct elf_x86_64_link_hash_entry *) ind;
1135
1136 if (!edir->has_bnd_reloc)
1137 edir->has_bnd_reloc = eind->has_bnd_reloc;
1138
1139 if (eind->dyn_relocs != NULL)
1140 {
1141 if (edir->dyn_relocs != NULL)
1142 {
1143 struct elf_dyn_relocs **pp;
1144 struct elf_dyn_relocs *p;
1145
1146 /* Add reloc counts against the indirect sym to the direct sym
1147 list. Merge any entries against the same section. */
1148 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1149 {
1150 struct elf_dyn_relocs *q;
1151
1152 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1153 if (q->sec == p->sec)
1154 {
1155 q->pc_count += p->pc_count;
1156 q->count += p->count;
1157 *pp = p->next;
1158 break;
1159 }
1160 if (q == NULL)
1161 pp = &p->next;
1162 }
1163 *pp = edir->dyn_relocs;
1164 }
1165
1166 edir->dyn_relocs = eind->dyn_relocs;
1167 eind->dyn_relocs = NULL;
1168 }
1169
1170 if (ind->root.type == bfd_link_hash_indirect
1171 && dir->got.refcount <= 0)
1172 {
1173 edir->tls_type = eind->tls_type;
1174 eind->tls_type = GOT_UNKNOWN;
1175 }
1176
1177 if (ELIMINATE_COPY_RELOCS
1178 && ind->root.type != bfd_link_hash_indirect
1179 && dir->dynamic_adjusted)
1180 {
1181 /* If called to transfer flags for a weakdef during processing
1182 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1183 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1184 dir->ref_dynamic |= ind->ref_dynamic;
1185 dir->ref_regular |= ind->ref_regular;
1186 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1187 dir->needs_plt |= ind->needs_plt;
1188 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1189 }
1190 else
1191 {
1192 if (eind->func_pointer_refcount > 0)
1193 {
1194 edir->func_pointer_refcount += eind->func_pointer_refcount;
1195 eind->func_pointer_refcount = 0;
1196 }
1197
1198 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1199 }
1200 }
1201
1202 static bfd_boolean
1203 elf64_x86_64_elf_object_p (bfd *abfd)
1204 {
1205 /* Set the right machine number for an x86-64 elf64 file. */
1206 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1207 return TRUE;
1208 }
1209
1210 static bfd_boolean
1211 elf32_x86_64_elf_object_p (bfd *abfd)
1212 {
1213 /* Set the right machine number for an x86-64 elf32 file. */
1214 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1215 return TRUE;
1216 }
1217
1218 /* Return TRUE if the TLS access code sequence support transition
1219 from R_TYPE. */
1220
1221 static bfd_boolean
1222 elf_x86_64_check_tls_transition (bfd *abfd,
1223 struct bfd_link_info *info,
1224 asection *sec,
1225 bfd_byte *contents,
1226 Elf_Internal_Shdr *symtab_hdr,
1227 struct elf_link_hash_entry **sym_hashes,
1228 unsigned int r_type,
1229 const Elf_Internal_Rela *rel,
1230 const Elf_Internal_Rela *relend)
1231 {
1232 unsigned int val;
1233 unsigned long r_symndx;
1234 bfd_boolean largepic = FALSE;
1235 struct elf_link_hash_entry *h;
1236 bfd_vma offset;
1237 struct elf_x86_64_link_hash_table *htab;
1238
1239 /* Get the section contents. */
1240 if (contents == NULL)
1241 {
1242 if (elf_section_data (sec)->this_hdr.contents != NULL)
1243 contents = elf_section_data (sec)->this_hdr.contents;
1244 else
1245 {
1246 /* FIXME: How to better handle error condition? */
1247 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1248 return FALSE;
1249
1250 /* Cache the section contents for elf_link_input_bfd. */
1251 elf_section_data (sec)->this_hdr.contents = contents;
1252 }
1253 }
1254
1255 htab = elf_x86_64_hash_table (info);
1256 offset = rel->r_offset;
1257 switch (r_type)
1258 {
1259 case R_X86_64_TLSGD:
1260 case R_X86_64_TLSLD:
1261 if ((rel + 1) >= relend)
1262 return FALSE;
1263
1264 if (r_type == R_X86_64_TLSGD)
1265 {
1266 /* Check transition from GD access model. For 64bit, only
1267 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1268 .word 0x6666; rex64; call __tls_get_addr
1269 can transit to different access model. For 32bit, only
1270 leaq foo@tlsgd(%rip), %rdi
1271 .word 0x6666; rex64; call __tls_get_addr
1272 can transit to different access model. For largepic
1273 we also support:
1274 leaq foo@tlsgd(%rip), %rdi
1275 movabsq $__tls_get_addr@pltoff, %rax
1276 addq $rbx, %rax
1277 call *%rax. */
1278
1279 static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 };
1280 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1281
1282 if ((offset + 12) > sec->size)
1283 return FALSE;
1284
1285 if (memcmp (contents + offset + 4, call, 4) != 0)
1286 {
1287 if (!ABI_64_P (abfd)
1288 || (offset + 19) > sec->size
1289 || offset < 3
1290 || memcmp (contents + offset - 3, leaq + 1, 3) != 0
1291 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1292 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1293 != 0)
1294 return FALSE;
1295 largepic = TRUE;
1296 }
1297 else if (ABI_64_P (abfd))
1298 {
1299 if (offset < 4
1300 || memcmp (contents + offset - 4, leaq, 4) != 0)
1301 return FALSE;
1302 }
1303 else
1304 {
1305 if (offset < 3
1306 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1307 return FALSE;
1308 }
1309 }
1310 else
1311 {
1312 /* Check transition from LD access model. Only
1313 leaq foo@tlsld(%rip), %rdi;
1314 call __tls_get_addr
1315 can transit to different access model. For largepic
1316 we also support:
1317 leaq foo@tlsld(%rip), %rdi
1318 movabsq $__tls_get_addr@pltoff, %rax
1319 addq $rbx, %rax
1320 call *%rax. */
1321
1322 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1323
1324 if (offset < 3 || (offset + 9) > sec->size)
1325 return FALSE;
1326
1327 if (memcmp (contents + offset - 3, lea, 3) != 0)
1328 return FALSE;
1329
1330 if (0xe8 != *(contents + offset + 4))
1331 {
1332 if (!ABI_64_P (abfd)
1333 || (offset + 19) > sec->size
1334 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1335 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1336 != 0)
1337 return FALSE;
1338 largepic = TRUE;
1339 }
1340 }
1341
1342 r_symndx = htab->r_sym (rel[1].r_info);
1343 if (r_symndx < symtab_hdr->sh_info)
1344 return FALSE;
1345
1346 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1347 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1348 may be versioned. */
1349 return (h != NULL
1350 && h->root.root.string != NULL
1351 && (largepic
1352 ? ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64
1353 : (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1354 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32))
1355 && (strncmp (h->root.root.string,
1356 "__tls_get_addr", 14) == 0));
1357
1358 case R_X86_64_GOTTPOFF:
1359 /* Check transition from IE access model:
1360 mov foo@gottpoff(%rip), %reg
1361 add foo@gottpoff(%rip), %reg
1362 */
1363
1364 /* Check REX prefix first. */
1365 if (offset >= 3 && (offset + 4) <= sec->size)
1366 {
1367 val = bfd_get_8 (abfd, contents + offset - 3);
1368 if (val != 0x48 && val != 0x4c)
1369 {
1370 /* X32 may have 0x44 REX prefix or no REX prefix. */
1371 if (ABI_64_P (abfd))
1372 return FALSE;
1373 }
1374 }
1375 else
1376 {
1377 /* X32 may not have any REX prefix. */
1378 if (ABI_64_P (abfd))
1379 return FALSE;
1380 if (offset < 2 || (offset + 3) > sec->size)
1381 return FALSE;
1382 }
1383
1384 val = bfd_get_8 (abfd, contents + offset - 2);
1385 if (val != 0x8b && val != 0x03)
1386 return FALSE;
1387
1388 val = bfd_get_8 (abfd, contents + offset - 1);
1389 return (val & 0xc7) == 5;
1390
1391 case R_X86_64_GOTPC32_TLSDESC:
1392 /* Check transition from GDesc access model:
1393 leaq x@tlsdesc(%rip), %rax
1394
1395 Make sure it's a leaq adding rip to a 32-bit offset
1396 into any register, although it's probably almost always
1397 going to be rax. */
1398
1399 if (offset < 3 || (offset + 4) > sec->size)
1400 return FALSE;
1401
1402 val = bfd_get_8 (abfd, contents + offset - 3);
1403 if ((val & 0xfb) != 0x48)
1404 return FALSE;
1405
1406 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1407 return FALSE;
1408
1409 val = bfd_get_8 (abfd, contents + offset - 1);
1410 return (val & 0xc7) == 0x05;
1411
1412 case R_X86_64_TLSDESC_CALL:
1413 /* Check transition from GDesc access model:
1414 call *x@tlsdesc(%rax)
1415 */
1416 if (offset + 2 <= sec->size)
1417 {
1418 /* Make sure that it's a call *x@tlsdesc(%rax). */
1419 static const unsigned char call[] = { 0xff, 0x10 };
1420 return memcmp (contents + offset, call, 2) == 0;
1421 }
1422
1423 return FALSE;
1424
1425 default:
1426 abort ();
1427 }
1428 }
1429
1430 /* Return TRUE if the TLS access transition is OK or no transition
1431 will be performed. Update R_TYPE if there is a transition. */
1432
1433 static bfd_boolean
1434 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1435 asection *sec, bfd_byte *contents,
1436 Elf_Internal_Shdr *symtab_hdr,
1437 struct elf_link_hash_entry **sym_hashes,
1438 unsigned int *r_type, int tls_type,
1439 const Elf_Internal_Rela *rel,
1440 const Elf_Internal_Rela *relend,
1441 struct elf_link_hash_entry *h,
1442 unsigned long r_symndx)
1443 {
1444 unsigned int from_type = *r_type;
1445 unsigned int to_type = from_type;
1446 bfd_boolean check = TRUE;
1447
1448 /* Skip TLS transition for functions. */
1449 if (h != NULL
1450 && (h->type == STT_FUNC
1451 || h->type == STT_GNU_IFUNC))
1452 return TRUE;
1453
1454 switch (from_type)
1455 {
1456 case R_X86_64_TLSGD:
1457 case R_X86_64_GOTPC32_TLSDESC:
1458 case R_X86_64_TLSDESC_CALL:
1459 case R_X86_64_GOTTPOFF:
1460 if (bfd_link_executable (info))
1461 {
1462 if (h == NULL)
1463 to_type = R_X86_64_TPOFF32;
1464 else
1465 to_type = R_X86_64_GOTTPOFF;
1466 }
1467
1468 /* When we are called from elf_x86_64_relocate_section,
1469 CONTENTS isn't NULL and there may be additional transitions
1470 based on TLS_TYPE. */
1471 if (contents != NULL)
1472 {
1473 unsigned int new_to_type = to_type;
1474
1475 if (bfd_link_executable (info)
1476 && h != NULL
1477 && h->dynindx == -1
1478 && tls_type == GOT_TLS_IE)
1479 new_to_type = R_X86_64_TPOFF32;
1480
1481 if (to_type == R_X86_64_TLSGD
1482 || to_type == R_X86_64_GOTPC32_TLSDESC
1483 || to_type == R_X86_64_TLSDESC_CALL)
1484 {
1485 if (tls_type == GOT_TLS_IE)
1486 new_to_type = R_X86_64_GOTTPOFF;
1487 }
1488
1489 /* We checked the transition before when we were called from
1490 elf_x86_64_check_relocs. We only want to check the new
1491 transition which hasn't been checked before. */
1492 check = new_to_type != to_type && from_type == to_type;
1493 to_type = new_to_type;
1494 }
1495
1496 break;
1497
1498 case R_X86_64_TLSLD:
1499 if (bfd_link_executable (info))
1500 to_type = R_X86_64_TPOFF32;
1501 break;
1502
1503 default:
1504 return TRUE;
1505 }
1506
1507 /* Return TRUE if there is no transition. */
1508 if (from_type == to_type)
1509 return TRUE;
1510
1511 /* Check if the transition can be performed. */
1512 if (check
1513 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1514 symtab_hdr, sym_hashes,
1515 from_type, rel, relend))
1516 {
1517 reloc_howto_type *from, *to;
1518 const char *name;
1519
1520 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1521 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1522
1523 if (h)
1524 name = h->root.root.string;
1525 else
1526 {
1527 struct elf_x86_64_link_hash_table *htab;
1528
1529 htab = elf_x86_64_hash_table (info);
1530 if (htab == NULL)
1531 name = "*unknown*";
1532 else
1533 {
1534 Elf_Internal_Sym *isym;
1535
1536 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1537 abfd, r_symndx);
1538 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1539 }
1540 }
1541
1542 (*_bfd_error_handler)
1543 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1544 "in section `%A' failed"),
1545 abfd, sec, from->name, to->name, name,
1546 (unsigned long) rel->r_offset);
1547 bfd_set_error (bfd_error_bad_value);
1548 return FALSE;
1549 }
1550
1551 *r_type = to_type;
1552 return TRUE;
1553 }
1554
1555 /* Rename some of the generic section flags to better document how they
1556 are used here. */
1557 #define need_convert_load sec_flg0
1558
1559 /* Look through the relocs for a section during the first phase, and
1560 calculate needed space in the global offset table, procedure
1561 linkage table, and dynamic reloc sections. */
1562
1563 static bfd_boolean
1564 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1565 asection *sec,
1566 const Elf_Internal_Rela *relocs)
1567 {
1568 struct elf_x86_64_link_hash_table *htab;
1569 Elf_Internal_Shdr *symtab_hdr;
1570 struct elf_link_hash_entry **sym_hashes;
1571 const Elf_Internal_Rela *rel;
1572 const Elf_Internal_Rela *rel_end;
1573 asection *sreloc;
1574 bfd_boolean use_plt_got;
1575
1576 if (bfd_link_relocatable (info))
1577 return TRUE;
1578
1579 BFD_ASSERT (is_x86_64_elf (abfd));
1580
1581 htab = elf_x86_64_hash_table (info);
1582 if (htab == NULL)
1583 return FALSE;
1584
1585 use_plt_got = get_elf_x86_64_backend_data (abfd) == &elf_x86_64_arch_bed;
1586
1587 symtab_hdr = &elf_symtab_hdr (abfd);
1588 sym_hashes = elf_sym_hashes (abfd);
1589
1590 sreloc = NULL;
1591
1592 rel_end = relocs + sec->reloc_count;
1593 for (rel = relocs; rel < rel_end; rel++)
1594 {
1595 unsigned int r_type;
1596 unsigned long r_symndx;
1597 struct elf_link_hash_entry *h;
1598 Elf_Internal_Sym *isym;
1599 const char *name;
1600 bfd_boolean size_reloc;
1601
1602 r_symndx = htab->r_sym (rel->r_info);
1603 r_type = ELF32_R_TYPE (rel->r_info);
1604
1605 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1606 {
1607 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1608 abfd, r_symndx);
1609 return FALSE;
1610 }
1611
1612 if (r_symndx < symtab_hdr->sh_info)
1613 {
1614 /* A local symbol. */
1615 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1616 abfd, r_symndx);
1617 if (isym == NULL)
1618 return FALSE;
1619
1620 /* Check relocation against local STT_GNU_IFUNC symbol. */
1621 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1622 {
1623 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1624 TRUE);
1625 if (h == NULL)
1626 return FALSE;
1627
1628 /* Fake a STT_GNU_IFUNC symbol. */
1629 h->type = STT_GNU_IFUNC;
1630 h->def_regular = 1;
1631 h->ref_regular = 1;
1632 h->forced_local = 1;
1633 h->root.type = bfd_link_hash_defined;
1634 }
1635 else
1636 h = NULL;
1637 }
1638 else
1639 {
1640 isym = NULL;
1641 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1642 while (h->root.type == bfd_link_hash_indirect
1643 || h->root.type == bfd_link_hash_warning)
1644 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1645 }
1646
1647 /* Check invalid x32 relocations. */
1648 if (!ABI_64_P (abfd))
1649 switch (r_type)
1650 {
1651 default:
1652 break;
1653
1654 case R_X86_64_DTPOFF64:
1655 case R_X86_64_TPOFF64:
1656 case R_X86_64_PC64:
1657 case R_X86_64_GOTOFF64:
1658 case R_X86_64_GOT64:
1659 case R_X86_64_GOTPCREL64:
1660 case R_X86_64_GOTPC64:
1661 case R_X86_64_GOTPLT64:
1662 case R_X86_64_PLTOFF64:
1663 {
1664 if (h)
1665 name = h->root.root.string;
1666 else
1667 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1668 NULL);
1669 (*_bfd_error_handler)
1670 (_("%B: relocation %s against symbol `%s' isn't "
1671 "supported in x32 mode"), abfd,
1672 x86_64_elf_howto_table[r_type].name, name);
1673 bfd_set_error (bfd_error_bad_value);
1674 return FALSE;
1675 }
1676 break;
1677 }
1678
1679 if (h != NULL)
1680 {
1681 /* Create the ifunc sections for static executables. If we
1682 never see an indirect function symbol nor we are building
1683 a static executable, those sections will be empty and
1684 won't appear in output. */
1685 switch (r_type)
1686 {
1687 default:
1688 break;
1689
1690 case R_X86_64_PC32_BND:
1691 case R_X86_64_PLT32_BND:
1692 case R_X86_64_PC32:
1693 case R_X86_64_PLT32:
1694 case R_X86_64_32:
1695 case R_X86_64_64:
1696 /* MPX PLT is supported only if elf_x86_64_arch_bed
1697 is used in 64-bit mode. */
1698 if (ABI_64_P (abfd)
1699 && info->bndplt
1700 && (get_elf_x86_64_backend_data (abfd)
1701 == &elf_x86_64_arch_bed))
1702 {
1703 elf_x86_64_hash_entry (h)->has_bnd_reloc = 1;
1704
1705 /* Create the second PLT for Intel MPX support. */
1706 if (htab->plt_bnd == NULL)
1707 {
1708 unsigned int plt_bnd_align;
1709 const struct elf_backend_data *bed;
1710
1711 bed = get_elf_backend_data (info->output_bfd);
1712 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry) == 8
1713 && (sizeof (elf_x86_64_bnd_plt2_entry)
1714 == sizeof (elf_x86_64_legacy_plt2_entry)));
1715 plt_bnd_align = 3;
1716
1717 if (htab->elf.dynobj == NULL)
1718 htab->elf.dynobj = abfd;
1719 htab->plt_bnd
1720 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1721 ".plt.bnd",
1722 (bed->dynamic_sec_flags
1723 | SEC_ALLOC
1724 | SEC_CODE
1725 | SEC_LOAD
1726 | SEC_READONLY));
1727 if (htab->plt_bnd == NULL
1728 || !bfd_set_section_alignment (htab->elf.dynobj,
1729 htab->plt_bnd,
1730 plt_bnd_align))
1731 return FALSE;
1732 }
1733 }
1734
1735 case R_X86_64_32S:
1736 case R_X86_64_PC64:
1737 case R_X86_64_GOTPCREL:
1738 case R_X86_64_GOTPCRELX:
1739 case R_X86_64_REX_GOTPCRELX:
1740 case R_X86_64_GOTPCREL64:
1741 if (htab->elf.dynobj == NULL)
1742 htab->elf.dynobj = abfd;
1743 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1744 return FALSE;
1745 break;
1746 }
1747
1748 /* It is referenced by a non-shared object. */
1749 h->ref_regular = 1;
1750 h->root.non_ir_ref = 1;
1751
1752 if (h->type == STT_GNU_IFUNC)
1753 elf_tdata (info->output_bfd)->has_gnu_symbols
1754 |= elf_gnu_symbol_ifunc;
1755 }
1756
1757 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1758 symtab_hdr, sym_hashes,
1759 &r_type, GOT_UNKNOWN,
1760 rel, rel_end, h, r_symndx))
1761 return FALSE;
1762
1763 switch (r_type)
1764 {
1765 case R_X86_64_TLSLD:
1766 htab->tls_ld_got.refcount += 1;
1767 goto create_got;
1768
1769 case R_X86_64_TPOFF32:
1770 if (!bfd_link_executable (info) && ABI_64_P (abfd))
1771 {
1772 if (h)
1773 name = h->root.root.string;
1774 else
1775 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1776 NULL);
1777 (*_bfd_error_handler)
1778 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1779 abfd,
1780 x86_64_elf_howto_table[r_type].name, name);
1781 bfd_set_error (bfd_error_bad_value);
1782 return FALSE;
1783 }
1784 break;
1785
1786 case R_X86_64_GOTTPOFF:
1787 if (!bfd_link_executable (info))
1788 info->flags |= DF_STATIC_TLS;
1789 /* Fall through */
1790
1791 case R_X86_64_GOT32:
1792 case R_X86_64_GOTPCREL:
1793 case R_X86_64_GOTPCRELX:
1794 case R_X86_64_REX_GOTPCRELX:
1795 case R_X86_64_TLSGD:
1796 case R_X86_64_GOT64:
1797 case R_X86_64_GOTPCREL64:
1798 case R_X86_64_GOTPLT64:
1799 case R_X86_64_GOTPC32_TLSDESC:
1800 case R_X86_64_TLSDESC_CALL:
1801 /* This symbol requires a global offset table entry. */
1802 {
1803 int tls_type, old_tls_type;
1804
1805 switch (r_type)
1806 {
1807 default: tls_type = GOT_NORMAL; break;
1808 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1809 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1810 case R_X86_64_GOTPC32_TLSDESC:
1811 case R_X86_64_TLSDESC_CALL:
1812 tls_type = GOT_TLS_GDESC; break;
1813 }
1814
1815 if (h != NULL)
1816 {
1817 h->got.refcount += 1;
1818 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1819 }
1820 else
1821 {
1822 bfd_signed_vma *local_got_refcounts;
1823
1824 /* This is a global offset table entry for a local symbol. */
1825 local_got_refcounts = elf_local_got_refcounts (abfd);
1826 if (local_got_refcounts == NULL)
1827 {
1828 bfd_size_type size;
1829
1830 size = symtab_hdr->sh_info;
1831 size *= sizeof (bfd_signed_vma)
1832 + sizeof (bfd_vma) + sizeof (char);
1833 local_got_refcounts = ((bfd_signed_vma *)
1834 bfd_zalloc (abfd, size));
1835 if (local_got_refcounts == NULL)
1836 return FALSE;
1837 elf_local_got_refcounts (abfd) = local_got_refcounts;
1838 elf_x86_64_local_tlsdesc_gotent (abfd)
1839 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1840 elf_x86_64_local_got_tls_type (abfd)
1841 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1842 }
1843 local_got_refcounts[r_symndx] += 1;
1844 old_tls_type
1845 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1846 }
1847
1848 /* If a TLS symbol is accessed using IE at least once,
1849 there is no point to use dynamic model for it. */
1850 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1851 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1852 || tls_type != GOT_TLS_IE))
1853 {
1854 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1855 tls_type = old_tls_type;
1856 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1857 && GOT_TLS_GD_ANY_P (tls_type))
1858 tls_type |= old_tls_type;
1859 else
1860 {
1861 if (h)
1862 name = h->root.root.string;
1863 else
1864 name = bfd_elf_sym_name (abfd, symtab_hdr,
1865 isym, NULL);
1866 (*_bfd_error_handler)
1867 (_("%B: '%s' accessed both as normal and thread local symbol"),
1868 abfd, name);
1869 bfd_set_error (bfd_error_bad_value);
1870 return FALSE;
1871 }
1872 }
1873
1874 if (old_tls_type != tls_type)
1875 {
1876 if (h != NULL)
1877 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1878 else
1879 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1880 }
1881 }
1882 /* Fall through */
1883
1884 case R_X86_64_GOTOFF64:
1885 case R_X86_64_GOTPC32:
1886 case R_X86_64_GOTPC64:
1887 create_got:
1888 if (htab->elf.sgot == NULL)
1889 {
1890 if (htab->elf.dynobj == NULL)
1891 htab->elf.dynobj = abfd;
1892 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1893 info))
1894 return FALSE;
1895 }
1896 break;
1897
1898 case R_X86_64_PLT32:
1899 case R_X86_64_PLT32_BND:
1900 /* This symbol requires a procedure linkage table entry. We
1901 actually build the entry in adjust_dynamic_symbol,
1902 because this might be a case of linking PIC code which is
1903 never referenced by a dynamic object, in which case we
1904 don't need to generate a procedure linkage table entry
1905 after all. */
1906
1907 /* If this is a local symbol, we resolve it directly without
1908 creating a procedure linkage table entry. */
1909 if (h == NULL)
1910 continue;
1911
1912 h->needs_plt = 1;
1913 h->plt.refcount += 1;
1914 break;
1915
1916 case R_X86_64_PLTOFF64:
1917 /* This tries to form the 'address' of a function relative
1918 to GOT. For global symbols we need a PLT entry. */
1919 if (h != NULL)
1920 {
1921 h->needs_plt = 1;
1922 h->plt.refcount += 1;
1923 }
1924 goto create_got;
1925
1926 case R_X86_64_SIZE32:
1927 case R_X86_64_SIZE64:
1928 size_reloc = TRUE;
1929 goto do_size;
1930
1931 case R_X86_64_32:
1932 if (!ABI_64_P (abfd))
1933 goto pointer;
1934 case R_X86_64_8:
1935 case R_X86_64_16:
1936 case R_X86_64_32S:
1937 /* Let's help debug shared library creation. These relocs
1938 cannot be used in shared libs. Don't error out for
1939 sections we don't care about, such as debug sections or
1940 non-constant sections. */
1941 if (bfd_link_pic (info)
1942 && (sec->flags & SEC_ALLOC) != 0
1943 && (sec->flags & SEC_READONLY) != 0)
1944 {
1945 if (h)
1946 name = h->root.root.string;
1947 else
1948 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1949 (*_bfd_error_handler)
1950 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1951 abfd, x86_64_elf_howto_table[r_type].name, name);
1952 bfd_set_error (bfd_error_bad_value);
1953 return FALSE;
1954 }
1955 /* Fall through. */
1956
1957 case R_X86_64_PC8:
1958 case R_X86_64_PC16:
1959 case R_X86_64_PC32:
1960 case R_X86_64_PC32_BND:
1961 case R_X86_64_PC64:
1962 case R_X86_64_64:
1963 pointer:
1964 if (h != NULL && bfd_link_executable (info))
1965 {
1966 /* If this reloc is in a read-only section, we might
1967 need a copy reloc. We can't check reliably at this
1968 stage whether the section is read-only, as input
1969 sections have not yet been mapped to output sections.
1970 Tentatively set the flag for now, and correct in
1971 adjust_dynamic_symbol. */
1972 h->non_got_ref = 1;
1973
1974 /* We may need a .plt entry if the function this reloc
1975 refers to is in a shared lib. */
1976 h->plt.refcount += 1;
1977 if (r_type == R_X86_64_PC32)
1978 {
1979 /* Since something like ".long foo - ." may be used
1980 as pointer, make sure that PLT is used if foo is
1981 a function defined in a shared library. */
1982 if ((sec->flags & SEC_CODE) == 0)
1983 h->pointer_equality_needed = 1;
1984 }
1985 else if (r_type != R_X86_64_PC32_BND
1986 && r_type != R_X86_64_PC64)
1987 {
1988 h->pointer_equality_needed = 1;
1989 /* At run-time, R_X86_64_64 can be resolved for both
1990 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
1991 can only be resolved for x32. */
1992 if ((sec->flags & SEC_READONLY) == 0
1993 && (r_type == R_X86_64_64
1994 || (!ABI_64_P (abfd)
1995 && (r_type == R_X86_64_32
1996 || r_type == R_X86_64_32S))))
1997 {
1998 struct elf_x86_64_link_hash_entry *eh
1999 = (struct elf_x86_64_link_hash_entry *) h;
2000 eh->func_pointer_refcount += 1;
2001 }
2002 }
2003 }
2004
2005 size_reloc = FALSE;
2006 do_size:
2007 /* If we are creating a shared library, and this is a reloc
2008 against a global symbol, or a non PC relative reloc
2009 against a local symbol, then we need to copy the reloc
2010 into the shared library. However, if we are linking with
2011 -Bsymbolic, we do not need to copy a reloc against a
2012 global symbol which is defined in an object we are
2013 including in the link (i.e., DEF_REGULAR is set). At
2014 this point we have not seen all the input files, so it is
2015 possible that DEF_REGULAR is not set now but will be set
2016 later (it is never cleared). In case of a weak definition,
2017 DEF_REGULAR may be cleared later by a strong definition in
2018 a shared library. We account for that possibility below by
2019 storing information in the relocs_copied field of the hash
2020 table entry. A similar situation occurs when creating
2021 shared libraries and symbol visibility changes render the
2022 symbol local.
2023
2024 If on the other hand, we are creating an executable, we
2025 may need to keep relocations for symbols satisfied by a
2026 dynamic library if we manage to avoid copy relocs for the
2027 symbol. */
2028 if ((bfd_link_pic (info)
2029 && (sec->flags & SEC_ALLOC) != 0
2030 && (! IS_X86_64_PCREL_TYPE (r_type)
2031 || (h != NULL
2032 && (! SYMBOLIC_BIND (info, h)
2033 || h->root.type == bfd_link_hash_defweak
2034 || !h->def_regular))))
2035 || (ELIMINATE_COPY_RELOCS
2036 && !bfd_link_pic (info)
2037 && (sec->flags & SEC_ALLOC) != 0
2038 && h != NULL
2039 && (h->root.type == bfd_link_hash_defweak
2040 || !h->def_regular)))
2041 {
2042 struct elf_dyn_relocs *p;
2043 struct elf_dyn_relocs **head;
2044
2045 /* We must copy these reloc types into the output file.
2046 Create a reloc section in dynobj and make room for
2047 this reloc. */
2048 if (sreloc == NULL)
2049 {
2050 if (htab->elf.dynobj == NULL)
2051 htab->elf.dynobj = abfd;
2052
2053 sreloc = _bfd_elf_make_dynamic_reloc_section
2054 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2055 abfd, /*rela?*/ TRUE);
2056
2057 if (sreloc == NULL)
2058 return FALSE;
2059 }
2060
2061 /* If this is a global symbol, we count the number of
2062 relocations we need for this symbol. */
2063 if (h != NULL)
2064 {
2065 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
2066 }
2067 else
2068 {
2069 /* Track dynamic relocs needed for local syms too.
2070 We really need local syms available to do this
2071 easily. Oh well. */
2072 asection *s;
2073 void **vpp;
2074
2075 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2076 abfd, r_symndx);
2077 if (isym == NULL)
2078 return FALSE;
2079
2080 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2081 if (s == NULL)
2082 s = sec;
2083
2084 /* Beware of type punned pointers vs strict aliasing
2085 rules. */
2086 vpp = &(elf_section_data (s)->local_dynrel);
2087 head = (struct elf_dyn_relocs **)vpp;
2088 }
2089
2090 p = *head;
2091 if (p == NULL || p->sec != sec)
2092 {
2093 bfd_size_type amt = sizeof *p;
2094
2095 p = ((struct elf_dyn_relocs *)
2096 bfd_alloc (htab->elf.dynobj, amt));
2097 if (p == NULL)
2098 return FALSE;
2099 p->next = *head;
2100 *head = p;
2101 p->sec = sec;
2102 p->count = 0;
2103 p->pc_count = 0;
2104 }
2105
2106 p->count += 1;
2107 /* Count size relocation as PC-relative relocation. */
2108 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2109 p->pc_count += 1;
2110 }
2111 break;
2112
2113 /* This relocation describes the C++ object vtable hierarchy.
2114 Reconstruct it for later use during GC. */
2115 case R_X86_64_GNU_VTINHERIT:
2116 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2117 return FALSE;
2118 break;
2119
2120 /* This relocation describes which C++ vtable entries are actually
2121 used. Record for later use during GC. */
2122 case R_X86_64_GNU_VTENTRY:
2123 BFD_ASSERT (h != NULL);
2124 if (h != NULL
2125 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2126 return FALSE;
2127 break;
2128
2129 default:
2130 break;
2131 }
2132
2133 if (use_plt_got
2134 && h != NULL
2135 && h->plt.refcount > 0
2136 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2137 || h->got.refcount > 0)
2138 && htab->plt_got == NULL)
2139 {
2140 /* Create the GOT procedure linkage table. */
2141 unsigned int plt_got_align;
2142 const struct elf_backend_data *bed;
2143
2144 bed = get_elf_backend_data (info->output_bfd);
2145 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry) == 8
2146 && (sizeof (elf_x86_64_bnd_plt2_entry)
2147 == sizeof (elf_x86_64_legacy_plt2_entry)));
2148 plt_got_align = 3;
2149
2150 if (htab->elf.dynobj == NULL)
2151 htab->elf.dynobj = abfd;
2152 htab->plt_got
2153 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2154 ".plt.got",
2155 (bed->dynamic_sec_flags
2156 | SEC_ALLOC
2157 | SEC_CODE
2158 | SEC_LOAD
2159 | SEC_READONLY));
2160 if (htab->plt_got == NULL
2161 || !bfd_set_section_alignment (htab->elf.dynobj,
2162 htab->plt_got,
2163 plt_got_align))
2164 return FALSE;
2165 }
2166
2167 if ((r_type == R_X86_64_GOTPCREL
2168 || r_type == R_X86_64_GOTPCRELX
2169 || r_type == R_X86_64_REX_GOTPCRELX)
2170 && (h == NULL || h->type != STT_GNU_IFUNC))
2171 sec->need_convert_load = 1;
2172 }
2173
2174 return TRUE;
2175 }
2176
2177 /* Return the section that should be marked against GC for a given
2178 relocation. */
2179
2180 static asection *
2181 elf_x86_64_gc_mark_hook (asection *sec,
2182 struct bfd_link_info *info,
2183 Elf_Internal_Rela *rel,
2184 struct elf_link_hash_entry *h,
2185 Elf_Internal_Sym *sym)
2186 {
2187 if (h != NULL)
2188 switch (ELF32_R_TYPE (rel->r_info))
2189 {
2190 case R_X86_64_GNU_VTINHERIT:
2191 case R_X86_64_GNU_VTENTRY:
2192 return NULL;
2193 }
2194
2195 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2196 }
2197
2198 /* Update the got entry reference counts for the section being removed. */
2199
2200 static bfd_boolean
2201 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
2202 asection *sec,
2203 const Elf_Internal_Rela *relocs)
2204 {
2205 struct elf_x86_64_link_hash_table *htab;
2206 Elf_Internal_Shdr *symtab_hdr;
2207 struct elf_link_hash_entry **sym_hashes;
2208 bfd_signed_vma *local_got_refcounts;
2209 const Elf_Internal_Rela *rel, *relend;
2210
2211 if (bfd_link_relocatable (info))
2212 return TRUE;
2213
2214 htab = elf_x86_64_hash_table (info);
2215 if (htab == NULL)
2216 return FALSE;
2217
2218 elf_section_data (sec)->local_dynrel = NULL;
2219
2220 symtab_hdr = &elf_symtab_hdr (abfd);
2221 sym_hashes = elf_sym_hashes (abfd);
2222 local_got_refcounts = elf_local_got_refcounts (abfd);
2223
2224 htab = elf_x86_64_hash_table (info);
2225 relend = relocs + sec->reloc_count;
2226 for (rel = relocs; rel < relend; rel++)
2227 {
2228 unsigned long r_symndx;
2229 unsigned int r_type;
2230 struct elf_link_hash_entry *h = NULL;
2231 bfd_boolean pointer_reloc;
2232
2233 r_symndx = htab->r_sym (rel->r_info);
2234 if (r_symndx >= symtab_hdr->sh_info)
2235 {
2236 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2237 while (h->root.type == bfd_link_hash_indirect
2238 || h->root.type == bfd_link_hash_warning)
2239 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2240 }
2241 else
2242 {
2243 /* A local symbol. */
2244 Elf_Internal_Sym *isym;
2245
2246 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2247 abfd, r_symndx);
2248
2249 /* Check relocation against local STT_GNU_IFUNC symbol. */
2250 if (isym != NULL
2251 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2252 {
2253 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
2254 if (h == NULL)
2255 abort ();
2256 }
2257 }
2258
2259 if (h)
2260 {
2261 struct elf_x86_64_link_hash_entry *eh;
2262 struct elf_dyn_relocs **pp;
2263 struct elf_dyn_relocs *p;
2264
2265 eh = (struct elf_x86_64_link_hash_entry *) h;
2266
2267 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2268 if (p->sec == sec)
2269 {
2270 /* Everything must go for SEC. */
2271 *pp = p->next;
2272 break;
2273 }
2274 }
2275
2276 r_type = ELF32_R_TYPE (rel->r_info);
2277 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
2278 symtab_hdr, sym_hashes,
2279 &r_type, GOT_UNKNOWN,
2280 rel, relend, h, r_symndx))
2281 return FALSE;
2282
2283 pointer_reloc = FALSE;
2284 switch (r_type)
2285 {
2286 case R_X86_64_TLSLD:
2287 if (htab->tls_ld_got.refcount > 0)
2288 htab->tls_ld_got.refcount -= 1;
2289 break;
2290
2291 case R_X86_64_TLSGD:
2292 case R_X86_64_GOTPC32_TLSDESC:
2293 case R_X86_64_TLSDESC_CALL:
2294 case R_X86_64_GOTTPOFF:
2295 case R_X86_64_GOT32:
2296 case R_X86_64_GOTPCREL:
2297 case R_X86_64_GOTPCRELX:
2298 case R_X86_64_REX_GOTPCRELX:
2299 case R_X86_64_GOT64:
2300 case R_X86_64_GOTPCREL64:
2301 case R_X86_64_GOTPLT64:
2302 if (h != NULL)
2303 {
2304 if (h->got.refcount > 0)
2305 h->got.refcount -= 1;
2306 if (h->type == STT_GNU_IFUNC)
2307 {
2308 if (h->plt.refcount > 0)
2309 h->plt.refcount -= 1;
2310 }
2311 }
2312 else if (local_got_refcounts != NULL)
2313 {
2314 if (local_got_refcounts[r_symndx] > 0)
2315 local_got_refcounts[r_symndx] -= 1;
2316 }
2317 break;
2318
2319 case R_X86_64_32:
2320 case R_X86_64_32S:
2321 pointer_reloc = !ABI_64_P (abfd);
2322 goto pointer;
2323
2324 case R_X86_64_64:
2325 pointer_reloc = TRUE;
2326 case R_X86_64_8:
2327 case R_X86_64_16:
2328 case R_X86_64_PC8:
2329 case R_X86_64_PC16:
2330 case R_X86_64_PC32:
2331 case R_X86_64_PC32_BND:
2332 case R_X86_64_PC64:
2333 case R_X86_64_SIZE32:
2334 case R_X86_64_SIZE64:
2335 pointer:
2336 if (bfd_link_pic (info)
2337 && (h == NULL || h->type != STT_GNU_IFUNC))
2338 break;
2339 /* Fall thru */
2340
2341 case R_X86_64_PLT32:
2342 case R_X86_64_PLT32_BND:
2343 case R_X86_64_PLTOFF64:
2344 if (h != NULL)
2345 {
2346 if (h->plt.refcount > 0)
2347 h->plt.refcount -= 1;
2348 if (pointer_reloc && (sec->flags & SEC_READONLY) == 0)
2349 {
2350 struct elf_x86_64_link_hash_entry *eh
2351 = (struct elf_x86_64_link_hash_entry *) h;
2352 if (eh->func_pointer_refcount > 0)
2353 eh->func_pointer_refcount -= 1;
2354 }
2355 }
2356 break;
2357
2358 default:
2359 break;
2360 }
2361 }
2362
2363 return TRUE;
2364 }
2365
2366 /* Adjust a symbol defined by a dynamic object and referenced by a
2367 regular object. The current definition is in some section of the
2368 dynamic object, but we're not including those sections. We have to
2369 change the definition to something the rest of the link can
2370 understand. */
2371
2372 static bfd_boolean
2373 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2374 struct elf_link_hash_entry *h)
2375 {
2376 struct elf_x86_64_link_hash_table *htab;
2377 asection *s;
2378 struct elf_x86_64_link_hash_entry *eh;
2379 struct elf_dyn_relocs *p;
2380
2381 /* STT_GNU_IFUNC symbol must go through PLT. */
2382 if (h->type == STT_GNU_IFUNC)
2383 {
2384 /* All local STT_GNU_IFUNC references must be treate as local
2385 calls via local PLT. */
2386 if (h->ref_regular
2387 && SYMBOL_CALLS_LOCAL (info, h))
2388 {
2389 bfd_size_type pc_count = 0, count = 0;
2390 struct elf_dyn_relocs **pp;
2391
2392 eh = (struct elf_x86_64_link_hash_entry *) h;
2393 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2394 {
2395 pc_count += p->pc_count;
2396 p->count -= p->pc_count;
2397 p->pc_count = 0;
2398 count += p->count;
2399 if (p->count == 0)
2400 *pp = p->next;
2401 else
2402 pp = &p->next;
2403 }
2404
2405 if (pc_count || count)
2406 {
2407 h->needs_plt = 1;
2408 h->non_got_ref = 1;
2409 if (h->plt.refcount <= 0)
2410 h->plt.refcount = 1;
2411 else
2412 h->plt.refcount += 1;
2413 }
2414 }
2415
2416 if (h->plt.refcount <= 0)
2417 {
2418 h->plt.offset = (bfd_vma) -1;
2419 h->needs_plt = 0;
2420 }
2421 return TRUE;
2422 }
2423
2424 /* If this is a function, put it in the procedure linkage table. We
2425 will fill in the contents of the procedure linkage table later,
2426 when we know the address of the .got section. */
2427 if (h->type == STT_FUNC
2428 || h->needs_plt)
2429 {
2430 if (h->plt.refcount <= 0
2431 || SYMBOL_CALLS_LOCAL (info, h)
2432 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2433 && h->root.type == bfd_link_hash_undefweak))
2434 {
2435 /* This case can occur if we saw a PLT32 reloc in an input
2436 file, but the symbol was never referred to by a dynamic
2437 object, or if all references were garbage collected. In
2438 such a case, we don't actually need to build a procedure
2439 linkage table, and we can just do a PC32 reloc instead. */
2440 h->plt.offset = (bfd_vma) -1;
2441 h->needs_plt = 0;
2442 }
2443
2444 return TRUE;
2445 }
2446 else
2447 /* It's possible that we incorrectly decided a .plt reloc was
2448 needed for an R_X86_64_PC32 reloc to a non-function sym in
2449 check_relocs. We can't decide accurately between function and
2450 non-function syms in check-relocs; Objects loaded later in
2451 the link may change h->type. So fix it now. */
2452 h->plt.offset = (bfd_vma) -1;
2453
2454 /* If this is a weak symbol, and there is a real definition, the
2455 processor independent code will have arranged for us to see the
2456 real definition first, and we can just use the same value. */
2457 if (h->u.weakdef != NULL)
2458 {
2459 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2460 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2461 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2462 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2463 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2464 {
2465 eh = (struct elf_x86_64_link_hash_entry *) h;
2466 h->non_got_ref = h->u.weakdef->non_got_ref;
2467 eh->needs_copy = h->u.weakdef->needs_copy;
2468 }
2469 return TRUE;
2470 }
2471
2472 /* This is a reference to a symbol defined by a dynamic object which
2473 is not a function. */
2474
2475 /* If we are creating a shared library, we must presume that the
2476 only references to the symbol are via the global offset table.
2477 For such cases we need not do anything here; the relocations will
2478 be handled correctly by relocate_section. */
2479 if (!bfd_link_executable (info))
2480 return TRUE;
2481
2482 /* If there are no references to this symbol that do not use the
2483 GOT, we don't need to generate a copy reloc. */
2484 if (!h->non_got_ref)
2485 return TRUE;
2486
2487 /* If -z nocopyreloc was given, we won't generate them either. */
2488 if (info->nocopyreloc)
2489 {
2490 h->non_got_ref = 0;
2491 return TRUE;
2492 }
2493
2494 if (ELIMINATE_COPY_RELOCS)
2495 {
2496 eh = (struct elf_x86_64_link_hash_entry *) h;
2497 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2498 {
2499 s = p->sec->output_section;
2500 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2501 break;
2502 }
2503
2504 /* If we didn't find any dynamic relocs in read-only sections, then
2505 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2506 if (p == NULL)
2507 {
2508 h->non_got_ref = 0;
2509 return TRUE;
2510 }
2511 }
2512
2513 /* We must allocate the symbol in our .dynbss section, which will
2514 become part of the .bss section of the executable. There will be
2515 an entry for this symbol in the .dynsym section. The dynamic
2516 object will contain position independent code, so all references
2517 from the dynamic object to this symbol will go through the global
2518 offset table. The dynamic linker will use the .dynsym entry to
2519 determine the address it must put in the global offset table, so
2520 both the dynamic object and the regular object will refer to the
2521 same memory location for the variable. */
2522
2523 htab = elf_x86_64_hash_table (info);
2524 if (htab == NULL)
2525 return FALSE;
2526
2527 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2528 to copy the initial value out of the dynamic object and into the
2529 runtime process image. */
2530 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2531 {
2532 const struct elf_backend_data *bed;
2533 bed = get_elf_backend_data (info->output_bfd);
2534 htab->srelbss->size += bed->s->sizeof_rela;
2535 h->needs_copy = 1;
2536 }
2537
2538 s = htab->sdynbss;
2539
2540 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2541 }
2542
2543 /* Allocate space in .plt, .got and associated reloc sections for
2544 dynamic relocs. */
2545
2546 static bfd_boolean
2547 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2548 {
2549 struct bfd_link_info *info;
2550 struct elf_x86_64_link_hash_table *htab;
2551 struct elf_x86_64_link_hash_entry *eh;
2552 struct elf_dyn_relocs *p;
2553 const struct elf_backend_data *bed;
2554 unsigned int plt_entry_size;
2555
2556 if (h->root.type == bfd_link_hash_indirect)
2557 return TRUE;
2558
2559 eh = (struct elf_x86_64_link_hash_entry *) h;
2560
2561 info = (struct bfd_link_info *) inf;
2562 htab = elf_x86_64_hash_table (info);
2563 if (htab == NULL)
2564 return FALSE;
2565 bed = get_elf_backend_data (info->output_bfd);
2566 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2567
2568 /* We can't use the GOT PLT if pointer equality is needed since
2569 finish_dynamic_symbol won't clear symbol value and the dynamic
2570 linker won't update the GOT slot. We will get into an infinite
2571 loop at run-time. */
2572 if (htab->plt_got != NULL
2573 && h->type != STT_GNU_IFUNC
2574 && !h->pointer_equality_needed
2575 && h->plt.refcount > 0
2576 && h->got.refcount > 0)
2577 {
2578 /* Don't use the regular PLT if there are both GOT and GOTPLT
2579 reloctions. */
2580 h->plt.offset = (bfd_vma) -1;
2581
2582 /* Use the GOT PLT. */
2583 eh->plt_got.refcount = 1;
2584 }
2585
2586 /* Clear the reference count of function pointer relocations if
2587 symbol isn't a normal function. */
2588 if (h->type != STT_FUNC)
2589 eh->func_pointer_refcount = 0;
2590
2591 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2592 here if it is defined and referenced in a non-shared object. */
2593 if (h->type == STT_GNU_IFUNC
2594 && h->def_regular)
2595 {
2596 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2597 &eh->dyn_relocs,
2598 plt_entry_size,
2599 plt_entry_size,
2600 GOT_ENTRY_SIZE))
2601 {
2602 asection *s = htab->plt_bnd;
2603 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
2604 {
2605 /* Use the .plt.bnd section if it is created. */
2606 eh->plt_bnd.offset = s->size;
2607
2608 /* Make room for this entry in the .plt.bnd section. */
2609 s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2610 }
2611
2612 return TRUE;
2613 }
2614 else
2615 return FALSE;
2616 }
2617 /* Don't create the PLT entry if there are only function pointer
2618 relocations which can be resolved at run-time. */
2619 else if (htab->elf.dynamic_sections_created
2620 && (h->plt.refcount > eh->func_pointer_refcount
2621 || eh->plt_got.refcount > 0))
2622 {
2623 bfd_boolean use_plt_got;
2624
2625 /* Clear the reference count of function pointer relocations
2626 if PLT is used. */
2627 eh->func_pointer_refcount = 0;
2628
2629 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2630 {
2631 /* Don't use the regular PLT for DF_BIND_NOW. */
2632 h->plt.offset = (bfd_vma) -1;
2633
2634 /* Use the GOT PLT. */
2635 h->got.refcount = 1;
2636 eh->plt_got.refcount = 1;
2637 }
2638
2639 use_plt_got = eh->plt_got.refcount > 0;
2640
2641 /* Make sure this symbol is output as a dynamic symbol.
2642 Undefined weak syms won't yet be marked as dynamic. */
2643 if (h->dynindx == -1
2644 && !h->forced_local)
2645 {
2646 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2647 return FALSE;
2648 }
2649
2650 if (bfd_link_pic (info)
2651 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2652 {
2653 asection *s = htab->elf.splt;
2654 asection *bnd_s = htab->plt_bnd;
2655 asection *got_s = htab->plt_got;
2656
2657 /* If this is the first .plt entry, make room for the special
2658 first entry. The .plt section is used by prelink to undo
2659 prelinking for dynamic relocations. */
2660 if (s->size == 0)
2661 s->size = plt_entry_size;
2662
2663 if (use_plt_got)
2664 eh->plt_got.offset = got_s->size;
2665 else
2666 {
2667 h->plt.offset = s->size;
2668 if (bnd_s)
2669 eh->plt_bnd.offset = bnd_s->size;
2670 }
2671
2672 /* If this symbol is not defined in a regular file, and we are
2673 not generating a shared library, then set the symbol to this
2674 location in the .plt. This is required to make function
2675 pointers compare as equal between the normal executable and
2676 the shared library. */
2677 if (! bfd_link_pic (info)
2678 && !h->def_regular)
2679 {
2680 if (use_plt_got)
2681 {
2682 /* We need to make a call to the entry of the GOT PLT
2683 instead of regular PLT entry. */
2684 h->root.u.def.section = got_s;
2685 h->root.u.def.value = eh->plt_got.offset;
2686 }
2687 else
2688 {
2689 if (bnd_s)
2690 {
2691 /* We need to make a call to the entry of the second
2692 PLT instead of regular PLT entry. */
2693 h->root.u.def.section = bnd_s;
2694 h->root.u.def.value = eh->plt_bnd.offset;
2695 }
2696 else
2697 {
2698 h->root.u.def.section = s;
2699 h->root.u.def.value = h->plt.offset;
2700 }
2701 }
2702 }
2703
2704 /* Make room for this entry. */
2705 if (use_plt_got)
2706 got_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2707 else
2708 {
2709 s->size += plt_entry_size;
2710 if (bnd_s)
2711 bnd_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2712
2713 /* We also need to make an entry in the .got.plt section,
2714 which will be placed in the .got section by the linker
2715 script. */
2716 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2717
2718 /* We also need to make an entry in the .rela.plt
2719 section. */
2720 htab->elf.srelplt->size += bed->s->sizeof_rela;
2721 htab->elf.srelplt->reloc_count++;
2722 }
2723 }
2724 else
2725 {
2726 eh->plt_got.offset = (bfd_vma) -1;
2727 h->plt.offset = (bfd_vma) -1;
2728 h->needs_plt = 0;
2729 }
2730 }
2731 else
2732 {
2733 eh->plt_got.offset = (bfd_vma) -1;
2734 h->plt.offset = (bfd_vma) -1;
2735 h->needs_plt = 0;
2736 }
2737
2738 eh->tlsdesc_got = (bfd_vma) -1;
2739
2740 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2741 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2742 if (h->got.refcount > 0
2743 && bfd_link_executable (info)
2744 && h->dynindx == -1
2745 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2746 {
2747 h->got.offset = (bfd_vma) -1;
2748 }
2749 else if (h->got.refcount > 0)
2750 {
2751 asection *s;
2752 bfd_boolean dyn;
2753 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2754
2755 /* Make sure this symbol is output as a dynamic symbol.
2756 Undefined weak syms won't yet be marked as dynamic. */
2757 if (h->dynindx == -1
2758 && !h->forced_local)
2759 {
2760 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2761 return FALSE;
2762 }
2763
2764 if (GOT_TLS_GDESC_P (tls_type))
2765 {
2766 eh->tlsdesc_got = htab->elf.sgotplt->size
2767 - elf_x86_64_compute_jump_table_size (htab);
2768 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2769 h->got.offset = (bfd_vma) -2;
2770 }
2771 if (! GOT_TLS_GDESC_P (tls_type)
2772 || GOT_TLS_GD_P (tls_type))
2773 {
2774 s = htab->elf.sgot;
2775 h->got.offset = s->size;
2776 s->size += GOT_ENTRY_SIZE;
2777 if (GOT_TLS_GD_P (tls_type))
2778 s->size += GOT_ENTRY_SIZE;
2779 }
2780 dyn = htab->elf.dynamic_sections_created;
2781 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2782 and two if global.
2783 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2784 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2785 || tls_type == GOT_TLS_IE)
2786 htab->elf.srelgot->size += bed->s->sizeof_rela;
2787 else if (GOT_TLS_GD_P (tls_type))
2788 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2789 else if (! GOT_TLS_GDESC_P (tls_type)
2790 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2791 || h->root.type != bfd_link_hash_undefweak)
2792 && (bfd_link_pic (info)
2793 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2794 htab->elf.srelgot->size += bed->s->sizeof_rela;
2795 if (GOT_TLS_GDESC_P (tls_type))
2796 {
2797 htab->elf.srelplt->size += bed->s->sizeof_rela;
2798 htab->tlsdesc_plt = (bfd_vma) -1;
2799 }
2800 }
2801 else
2802 h->got.offset = (bfd_vma) -1;
2803
2804 if (eh->dyn_relocs == NULL)
2805 return TRUE;
2806
2807 /* In the shared -Bsymbolic case, discard space allocated for
2808 dynamic pc-relative relocs against symbols which turn out to be
2809 defined in regular objects. For the normal shared case, discard
2810 space for pc-relative relocs that have become local due to symbol
2811 visibility changes. */
2812
2813 if (bfd_link_pic (info))
2814 {
2815 /* Relocs that use pc_count are those that appear on a call
2816 insn, or certain REL relocs that can generated via assembly.
2817 We want calls to protected symbols to resolve directly to the
2818 function rather than going via the plt. If people want
2819 function pointer comparisons to work as expected then they
2820 should avoid writing weird assembly. */
2821 if (SYMBOL_CALLS_LOCAL (info, h))
2822 {
2823 struct elf_dyn_relocs **pp;
2824
2825 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2826 {
2827 p->count -= p->pc_count;
2828 p->pc_count = 0;
2829 if (p->count == 0)
2830 *pp = p->next;
2831 else
2832 pp = &p->next;
2833 }
2834 }
2835
2836 /* Also discard relocs on undefined weak syms with non-default
2837 visibility. */
2838 if (eh->dyn_relocs != NULL)
2839 {
2840 if (h->root.type == bfd_link_hash_undefweak)
2841 {
2842 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2843 eh->dyn_relocs = NULL;
2844
2845 /* Make sure undefined weak symbols are output as a dynamic
2846 symbol in PIEs. */
2847 else if (h->dynindx == -1
2848 && ! h->forced_local
2849 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2850 return FALSE;
2851 }
2852 /* For PIE, discard space for pc-relative relocs against
2853 symbols which turn out to need copy relocs. */
2854 else if (bfd_link_executable (info)
2855 && (h->needs_copy || eh->needs_copy)
2856 && h->def_dynamic
2857 && !h->def_regular)
2858 {
2859 struct elf_dyn_relocs **pp;
2860
2861 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2862 {
2863 if (p->pc_count != 0)
2864 *pp = p->next;
2865 else
2866 pp = &p->next;
2867 }
2868 }
2869 }
2870 }
2871 else if (ELIMINATE_COPY_RELOCS)
2872 {
2873 /* For the non-shared case, discard space for relocs against
2874 symbols which turn out to need copy relocs or are not
2875 dynamic. Keep dynamic relocations for run-time function
2876 pointer initialization. */
2877
2878 if ((!h->non_got_ref || eh->func_pointer_refcount > 0)
2879 && ((h->def_dynamic
2880 && !h->def_regular)
2881 || (htab->elf.dynamic_sections_created
2882 && (h->root.type == bfd_link_hash_undefweak
2883 || h->root.type == bfd_link_hash_undefined))))
2884 {
2885 /* Make sure this symbol is output as a dynamic symbol.
2886 Undefined weak syms won't yet be marked as dynamic. */
2887 if (h->dynindx == -1
2888 && ! h->forced_local
2889 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2890 return FALSE;
2891
2892 /* If that succeeded, we know we'll be keeping all the
2893 relocs. */
2894 if (h->dynindx != -1)
2895 goto keep;
2896 }
2897
2898 eh->dyn_relocs = NULL;
2899 eh->func_pointer_refcount = 0;
2900
2901 keep: ;
2902 }
2903
2904 /* Finally, allocate space. */
2905 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2906 {
2907 asection * sreloc;
2908
2909 sreloc = elf_section_data (p->sec)->sreloc;
2910
2911 BFD_ASSERT (sreloc != NULL);
2912
2913 sreloc->size += p->count * bed->s->sizeof_rela;
2914 }
2915
2916 return TRUE;
2917 }
2918
2919 /* Allocate space in .plt, .got and associated reloc sections for
2920 local dynamic relocs. */
2921
2922 static bfd_boolean
2923 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2924 {
2925 struct elf_link_hash_entry *h
2926 = (struct elf_link_hash_entry *) *slot;
2927
2928 if (h->type != STT_GNU_IFUNC
2929 || !h->def_regular
2930 || !h->ref_regular
2931 || !h->forced_local
2932 || h->root.type != bfd_link_hash_defined)
2933 abort ();
2934
2935 return elf_x86_64_allocate_dynrelocs (h, inf);
2936 }
2937
2938 /* Find any dynamic relocs that apply to read-only sections. */
2939
2940 static bfd_boolean
2941 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2942 void * inf)
2943 {
2944 struct elf_x86_64_link_hash_entry *eh;
2945 struct elf_dyn_relocs *p;
2946
2947 /* Skip local IFUNC symbols. */
2948 if (h->forced_local && h->type == STT_GNU_IFUNC)
2949 return TRUE;
2950
2951 eh = (struct elf_x86_64_link_hash_entry *) h;
2952 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2953 {
2954 asection *s = p->sec->output_section;
2955
2956 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2957 {
2958 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2959
2960 info->flags |= DF_TEXTREL;
2961
2962 if ((info->warn_shared_textrel && bfd_link_pic (info))
2963 || info->error_textrel)
2964 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2965 p->sec->owner, h->root.root.string,
2966 p->sec);
2967
2968 /* Not an error, just cut short the traversal. */
2969 return FALSE;
2970 }
2971 }
2972 return TRUE;
2973 }
2974
2975 /* With the local symbol, foo, we convert
2976 mov foo@GOTPCREL(%rip), %reg
2977 to
2978 lea foo(%rip), %reg
2979 and convert
2980 call/jmp *foo@GOTPCREL(%rip)
2981 to
2982 nop call foo/jmp foo nop
2983 When PIC is false, convert
2984 test %reg, foo@GOTPCREL(%rip)
2985 to
2986 test $foo, %reg
2987 and convert
2988 binop foo@GOTPCREL(%rip), %reg
2989 to
2990 binop $foo, %reg
2991 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2992 instructions. */
2993
2994 static bfd_boolean
2995 elf_x86_64_convert_load (bfd *abfd, asection *sec,
2996 struct bfd_link_info *link_info)
2997 {
2998 Elf_Internal_Shdr *symtab_hdr;
2999 Elf_Internal_Rela *internal_relocs;
3000 Elf_Internal_Rela *irel, *irelend;
3001 bfd_byte *contents;
3002 struct elf_x86_64_link_hash_table *htab;
3003 bfd_boolean changed_contents;
3004 bfd_boolean changed_relocs;
3005 bfd_signed_vma *local_got_refcounts;
3006 bfd_vma maxpagesize;
3007
3008 /* Don't even try to convert non-ELF outputs. */
3009 if (!is_elf_hash_table (link_info->hash))
3010 return FALSE;
3011
3012 /* Nothing to do if there is no need or no output. */
3013 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3014 || sec->need_convert_load == 0
3015 || bfd_is_abs_section (sec->output_section))
3016 return TRUE;
3017
3018 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3019
3020 /* Load the relocations for this section. */
3021 internal_relocs = (_bfd_elf_link_read_relocs
3022 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3023 link_info->keep_memory));
3024 if (internal_relocs == NULL)
3025 return FALSE;
3026
3027 htab = elf_x86_64_hash_table (link_info);
3028 changed_contents = FALSE;
3029 changed_relocs = FALSE;
3030 local_got_refcounts = elf_local_got_refcounts (abfd);
3031 maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
3032
3033 /* Get the section contents. */
3034 if (elf_section_data (sec)->this_hdr.contents != NULL)
3035 contents = elf_section_data (sec)->this_hdr.contents;
3036 else
3037 {
3038 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3039 goto error_return;
3040 }
3041
3042 irelend = internal_relocs + sec->reloc_count;
3043 for (irel = internal_relocs; irel < irelend; irel++)
3044 {
3045 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3046 unsigned int r_symndx = htab->r_sym (irel->r_info);
3047 unsigned int indx;
3048 struct elf_link_hash_entry *h;
3049 asection *tsec;
3050 char symtype;
3051 bfd_vma toff, roff;
3052 bfd_signed_vma raddend;
3053 unsigned int opcode;
3054 unsigned int modrm;
3055
3056 if (r_type != R_X86_64_GOTPCREL
3057 && r_type != R_X86_64_GOTPCRELX
3058 && r_type != R_X86_64_REX_GOTPCRELX)
3059 continue;
3060
3061 roff = irel->r_offset;
3062 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
3063 continue;
3064
3065 raddend = irel->r_addend;
3066 /* Addend for 32-bit PC-relative relocation must be -4. */
3067 if (raddend != -4)
3068 continue;
3069
3070 opcode = bfd_get_8 (abfd, contents + roff - 2);
3071
3072 /* It is OK to convert mov to lea. */
3073 if (opcode != 0x8b)
3074 {
3075 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
3076 for mov call, jmp or one of adc, add, and, cmp, or, sbb,
3077 sub, test, xor instructions. */
3078 if (r_type != R_X86_64_GOTPCRELX
3079 && r_type != R_X86_64_REX_GOTPCRELX)
3080 continue;
3081
3082 /* It is OK to convert indirect branch to direct branch. */
3083 if (opcode != 0xff)
3084 {
3085 /* It is OK to convert adc, add, and, cmp, or, sbb, sub,
3086 test, xor only when PIC is false. */
3087 if (bfd_link_pic (link_info))
3088 continue;
3089 }
3090 }
3091
3092 /* Get the symbol referred to by the reloc. */
3093 if (r_symndx < symtab_hdr->sh_info)
3094 {
3095 Elf_Internal_Sym *isym;
3096
3097 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
3098 abfd, r_symndx);
3099
3100 symtype = ELF_ST_TYPE (isym->st_info);
3101
3102 /* STT_GNU_IFUNC must keep GOTPCREL relocations and skip
3103 relocation against undefined symbols. */
3104 if (symtype == STT_GNU_IFUNC || isym->st_shndx == SHN_UNDEF)
3105 continue;
3106
3107 if (isym->st_shndx == SHN_ABS)
3108 tsec = bfd_abs_section_ptr;
3109 else if (isym->st_shndx == SHN_COMMON)
3110 tsec = bfd_com_section_ptr;
3111 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
3112 tsec = &_bfd_elf_large_com_section;
3113 else
3114 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3115
3116 h = NULL;
3117 toff = isym->st_value;
3118 }
3119 else
3120 {
3121 indx = r_symndx - symtab_hdr->sh_info;
3122 h = elf_sym_hashes (abfd)[indx];
3123 BFD_ASSERT (h != NULL);
3124
3125 while (h->root.type == bfd_link_hash_indirect
3126 || h->root.type == bfd_link_hash_warning)
3127 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3128
3129 /* STT_GNU_IFUNC must keep GOTPCREL relocations. We also
3130 avoid optimizing GOTPCREL relocations againt _DYNAMIC
3131 since ld.so may use its link-time address. */
3132 if ((h->def_regular
3133 || h->root.type == bfd_link_hash_defined
3134 || h->root.type == bfd_link_hash_defweak)
3135 && h->type != STT_GNU_IFUNC
3136 && h != htab->elf.hdynamic
3137 && SYMBOL_REFERENCES_LOCAL (link_info, h))
3138 {
3139 /* bfd_link_hash_new or bfd_link_hash_undefined is
3140 set by an assignment in a linker script in
3141 bfd_elf_record_link_assignment. FIXME: If we
3142 ever get a linker error due relocation overflow,
3143 we will skip this optimization. */
3144 if (h->def_regular
3145 && (h->root.type == bfd_link_hash_new
3146 || h->root.type == bfd_link_hash_undefined))
3147 goto convert;
3148 tsec = h->root.u.def.section;
3149 toff = h->root.u.def.value;
3150 symtype = h->type;
3151 }
3152 else
3153 continue;
3154 }
3155
3156 if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
3157 {
3158 /* At this stage in linking, no SEC_MERGE symbol has been
3159 adjusted, so all references to such symbols need to be
3160 passed through _bfd_merged_section_offset. (Later, in
3161 relocate_section, all SEC_MERGE symbols *except* for
3162 section symbols have been adjusted.)
3163
3164 gas may reduce relocations against symbols in SEC_MERGE
3165 sections to a relocation against the section symbol when
3166 the original addend was zero. When the reloc is against
3167 a section symbol we should include the addend in the
3168 offset passed to _bfd_merged_section_offset, since the
3169 location of interest is the original symbol. On the
3170 other hand, an access to "sym+addend" where "sym" is not
3171 a section symbol should not include the addend; Such an
3172 access is presumed to be an offset from "sym"; The
3173 location of interest is just "sym". */
3174 if (symtype == STT_SECTION)
3175 toff += raddend;
3176
3177 toff = _bfd_merged_section_offset (abfd, &tsec,
3178 elf_section_data (tsec)->sec_info,
3179 toff);
3180
3181 if (symtype != STT_SECTION)
3182 toff += raddend;
3183 }
3184 else
3185 toff += raddend;
3186
3187 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3188 if (tsec->output_section == sec->output_section)
3189 {
3190 if ((toff - roff + 0x80000000) > 0xffffffff)
3191 continue;
3192 }
3193 else
3194 {
3195 bfd_signed_vma distance;
3196
3197 /* At this point, we don't know the load addresses of TSEC
3198 section nor SEC section. We estimate the distrance between
3199 SEC and TSEC. We store the estimated distances in the
3200 compressed_size field of the output section, which is only
3201 used to decompress the compressed input section. */
3202 if (sec->output_section->compressed_size == 0)
3203 {
3204 asection *asect;
3205 bfd_size_type size = 0;
3206 for (asect = link_info->output_bfd->sections;
3207 asect != NULL;
3208 asect = asect->next)
3209 {
3210 asection *i;
3211 for (i = asect->map_head.s;
3212 i != NULL;
3213 i = i->map_head.s)
3214 {
3215 size = align_power (size, i->alignment_power);
3216 size += i->size;
3217 }
3218 asect->compressed_size = size;
3219 }
3220 }
3221
3222 /* Don't convert GOTPCREL relocations if TSEC isn't placed
3223 after SEC. */
3224 distance = (tsec->output_section->compressed_size
3225 - sec->output_section->compressed_size);
3226 if (distance < 0)
3227 continue;
3228
3229 /* Take PT_GNU_RELRO segment into account by adding
3230 maxpagesize. */
3231 if ((toff + distance + maxpagesize - roff + 0x80000000)
3232 > 0xffffffff)
3233 continue;
3234 }
3235
3236 convert:
3237 if (opcode == 0xff)
3238 {
3239 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
3240 unsigned int nop;
3241 unsigned int disp;
3242 bfd_vma nop_offset;
3243
3244 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
3245 R_X86_64_PC32. */
3246 modrm = bfd_get_8 (abfd, contents + roff - 1);
3247 if (modrm == 0x25)
3248 {
3249 /* Convert to "jmp foo nop". */
3250 modrm = 0xe9;
3251 nop = NOP_OPCODE;
3252 nop_offset = irel->r_offset + 3;
3253 disp = bfd_get_32 (abfd, contents + irel->r_offset);
3254 irel->r_offset -= 1;
3255 bfd_put_32 (abfd, disp, contents + irel->r_offset);
3256 }
3257 else
3258 {
3259 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
3260 is a nop prefix. */
3261 modrm = 0xe8;
3262 nop = link_info->call_nop_byte;
3263 if (link_info->call_nop_as_suffix)
3264 {
3265 nop_offset = irel->r_offset + 3;
3266 disp = bfd_get_32 (abfd, contents + irel->r_offset);
3267 irel->r_offset -= 1;
3268 bfd_put_32 (abfd, disp, contents + irel->r_offset);
3269 }
3270 else
3271 nop_offset = irel->r_offset - 2;
3272 }
3273 bfd_put_8 (abfd, nop, contents + nop_offset);
3274 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
3275 r_type = R_X86_64_PC32;
3276 }
3277 else
3278 {
3279 if (opcode == 0x8b)
3280 {
3281 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
3282 "lea foo(%rip), %reg". */
3283 opcode = 0x8d;
3284 r_type = R_X86_64_PC32;
3285 }
3286 else
3287 {
3288 modrm = bfd_get_8 (abfd, contents + roff - 1);
3289 if (opcode == 0x85)
3290 {
3291 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
3292 "test $foo, %reg". */
3293 modrm = 0xc0 | (modrm & 0x38) >> 3;
3294 opcode = 0xf7;
3295 }
3296 else
3297 {
3298 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
3299 "binop $foo, %reg". */
3300 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
3301 opcode = 0x81;
3302 }
3303 bfd_put_8 (abfd, modrm, contents + roff - 1);
3304
3305 if (r_type == R_X86_64_REX_GOTPCRELX)
3306 {
3307 /* Move the R bit to the B bit in REX byte. */
3308 unsigned int rex = bfd_get_8 (abfd, contents + roff - 3);
3309 rex = (rex & ~REX_R) | (rex & REX_R) >> 2;
3310 bfd_put_8 (abfd, rex, contents + roff - 3);
3311 }
3312 /* No addend for R_X86_64_32S relocation. */
3313 irel->r_addend = 0;
3314 r_type = R_X86_64_32S;
3315 }
3316
3317 bfd_put_8 (abfd, opcode, contents + roff - 2);
3318 }
3319
3320 irel->r_info = htab->r_info (r_symndx, r_type);
3321 changed_contents = TRUE;
3322 changed_relocs = TRUE;
3323
3324 if (h)
3325 {
3326 if (h->got.refcount > 0)
3327 h->got.refcount -= 1;
3328 }
3329 else
3330 {
3331 if (local_got_refcounts != NULL
3332 && local_got_refcounts[r_symndx] > 0)
3333 local_got_refcounts[r_symndx] -= 1;
3334 }
3335 }
3336
3337 if (contents != NULL
3338 && elf_section_data (sec)->this_hdr.contents != contents)
3339 {
3340 if (!changed_contents && !link_info->keep_memory)
3341 free (contents);
3342 else
3343 {
3344 /* Cache the section contents for elf_link_input_bfd. */
3345 elf_section_data (sec)->this_hdr.contents = contents;
3346 }
3347 }
3348
3349 if (elf_section_data (sec)->relocs != internal_relocs)
3350 {
3351 if (!changed_relocs)
3352 free (internal_relocs);
3353 else
3354 elf_section_data (sec)->relocs = internal_relocs;
3355 }
3356
3357 return TRUE;
3358
3359 error_return:
3360 if (contents != NULL
3361 && elf_section_data (sec)->this_hdr.contents != contents)
3362 free (contents);
3363 if (internal_relocs != NULL
3364 && elf_section_data (sec)->relocs != internal_relocs)
3365 free (internal_relocs);
3366 return FALSE;
3367 }
3368
3369 /* Set the sizes of the dynamic sections. */
3370
3371 static bfd_boolean
3372 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3373 struct bfd_link_info *info)
3374 {
3375 struct elf_x86_64_link_hash_table *htab;
3376 bfd *dynobj;
3377 asection *s;
3378 bfd_boolean relocs;
3379 bfd *ibfd;
3380 const struct elf_backend_data *bed;
3381
3382 htab = elf_x86_64_hash_table (info);
3383 if (htab == NULL)
3384 return FALSE;
3385 bed = get_elf_backend_data (output_bfd);
3386
3387 dynobj = htab->elf.dynobj;
3388 if (dynobj == NULL)
3389 abort ();
3390
3391 if (htab->elf.dynamic_sections_created)
3392 {
3393 /* Set the contents of the .interp section to the interpreter. */
3394 if (bfd_link_executable (info) && !info->nointerp)
3395 {
3396 s = bfd_get_linker_section (dynobj, ".interp");
3397 if (s == NULL)
3398 abort ();
3399 s->size = htab->dynamic_interpreter_size;
3400 s->contents = (unsigned char *) htab->dynamic_interpreter;
3401 }
3402 }
3403
3404 /* Set up .got offsets for local syms, and space for local dynamic
3405 relocs. */
3406 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3407 {
3408 bfd_signed_vma *local_got;
3409 bfd_signed_vma *end_local_got;
3410 char *local_tls_type;
3411 bfd_vma *local_tlsdesc_gotent;
3412 bfd_size_type locsymcount;
3413 Elf_Internal_Shdr *symtab_hdr;
3414 asection *srel;
3415
3416 if (! is_x86_64_elf (ibfd))
3417 continue;
3418
3419 for (s = ibfd->sections; s != NULL; s = s->next)
3420 {
3421 struct elf_dyn_relocs *p;
3422
3423 if (!elf_x86_64_convert_load (ibfd, s, info))
3424 return FALSE;
3425
3426 for (p = (struct elf_dyn_relocs *)
3427 (elf_section_data (s)->local_dynrel);
3428 p != NULL;
3429 p = p->next)
3430 {
3431 if (!bfd_is_abs_section (p->sec)
3432 && bfd_is_abs_section (p->sec->output_section))
3433 {
3434 /* Input section has been discarded, either because
3435 it is a copy of a linkonce section or due to
3436 linker script /DISCARD/, so we'll be discarding
3437 the relocs too. */
3438 }
3439 else if (p->count != 0)
3440 {
3441 srel = elf_section_data (p->sec)->sreloc;
3442 srel->size += p->count * bed->s->sizeof_rela;
3443 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3444 && (info->flags & DF_TEXTREL) == 0)
3445 {
3446 info->flags |= DF_TEXTREL;
3447 if ((info->warn_shared_textrel && bfd_link_pic (info))
3448 || info->error_textrel)
3449 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3450 p->sec->owner, p->sec);
3451 }
3452 }
3453 }
3454 }
3455
3456 local_got = elf_local_got_refcounts (ibfd);
3457 if (!local_got)
3458 continue;
3459
3460 symtab_hdr = &elf_symtab_hdr (ibfd);
3461 locsymcount = symtab_hdr->sh_info;
3462 end_local_got = local_got + locsymcount;
3463 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3464 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3465 s = htab->elf.sgot;
3466 srel = htab->elf.srelgot;
3467 for (; local_got < end_local_got;
3468 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3469 {
3470 *local_tlsdesc_gotent = (bfd_vma) -1;
3471 if (*local_got > 0)
3472 {
3473 if (GOT_TLS_GDESC_P (*local_tls_type))
3474 {
3475 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3476 - elf_x86_64_compute_jump_table_size (htab);
3477 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3478 *local_got = (bfd_vma) -2;
3479 }
3480 if (! GOT_TLS_GDESC_P (*local_tls_type)
3481 || GOT_TLS_GD_P (*local_tls_type))
3482 {
3483 *local_got = s->size;
3484 s->size += GOT_ENTRY_SIZE;
3485 if (GOT_TLS_GD_P (*local_tls_type))
3486 s->size += GOT_ENTRY_SIZE;
3487 }
3488 if (bfd_link_pic (info)
3489 || GOT_TLS_GD_ANY_P (*local_tls_type)
3490 || *local_tls_type == GOT_TLS_IE)
3491 {
3492 if (GOT_TLS_GDESC_P (*local_tls_type))
3493 {
3494 htab->elf.srelplt->size
3495 += bed->s->sizeof_rela;
3496 htab->tlsdesc_plt = (bfd_vma) -1;
3497 }
3498 if (! GOT_TLS_GDESC_P (*local_tls_type)
3499 || GOT_TLS_GD_P (*local_tls_type))
3500 srel->size += bed->s->sizeof_rela;
3501 }
3502 }
3503 else
3504 *local_got = (bfd_vma) -1;
3505 }
3506 }
3507
3508 if (htab->tls_ld_got.refcount > 0)
3509 {
3510 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3511 relocs. */
3512 htab->tls_ld_got.offset = htab->elf.sgot->size;
3513 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3514 htab->elf.srelgot->size += bed->s->sizeof_rela;
3515 }
3516 else
3517 htab->tls_ld_got.offset = -1;
3518
3519 /* Allocate global sym .plt and .got entries, and space for global
3520 sym dynamic relocs. */
3521 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3522 info);
3523
3524 /* Allocate .plt and .got entries, and space for local symbols. */
3525 htab_traverse (htab->loc_hash_table,
3526 elf_x86_64_allocate_local_dynrelocs,
3527 info);
3528
3529 /* For every jump slot reserved in the sgotplt, reloc_count is
3530 incremented. However, when we reserve space for TLS descriptors,
3531 it's not incremented, so in order to compute the space reserved
3532 for them, it suffices to multiply the reloc count by the jump
3533 slot size.
3534
3535 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3536 so that R_X86_64_IRELATIVE entries come last. */
3537 if (htab->elf.srelplt)
3538 {
3539 htab->sgotplt_jump_table_size
3540 = elf_x86_64_compute_jump_table_size (htab);
3541 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3542 }
3543 else if (htab->elf.irelplt)
3544 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3545
3546 if (htab->tlsdesc_plt)
3547 {
3548 /* If we're not using lazy TLS relocations, don't generate the
3549 PLT and GOT entries they require. */
3550 if ((info->flags & DF_BIND_NOW))
3551 htab->tlsdesc_plt = 0;
3552 else
3553 {
3554 htab->tlsdesc_got = htab->elf.sgot->size;
3555 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3556 /* Reserve room for the initial entry.
3557 FIXME: we could probably do away with it in this case. */
3558 if (htab->elf.splt->size == 0)
3559 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3560 htab->tlsdesc_plt = htab->elf.splt->size;
3561 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3562 }
3563 }
3564
3565 if (htab->elf.sgotplt)
3566 {
3567 /* Don't allocate .got.plt section if there are no GOT nor PLT
3568 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3569 if ((htab->elf.hgot == NULL
3570 || !htab->elf.hgot->ref_regular_nonweak)
3571 && (htab->elf.sgotplt->size
3572 == get_elf_backend_data (output_bfd)->got_header_size)
3573 && (htab->elf.splt == NULL
3574 || htab->elf.splt->size == 0)
3575 && (htab->elf.sgot == NULL
3576 || htab->elf.sgot->size == 0)
3577 && (htab->elf.iplt == NULL
3578 || htab->elf.iplt->size == 0)
3579 && (htab->elf.igotplt == NULL
3580 || htab->elf.igotplt->size == 0))
3581 htab->elf.sgotplt->size = 0;
3582 }
3583
3584 if (htab->plt_eh_frame != NULL
3585 && htab->elf.splt != NULL
3586 && htab->elf.splt->size != 0
3587 && !bfd_is_abs_section (htab->elf.splt->output_section)
3588 && _bfd_elf_eh_frame_present (info))
3589 {
3590 const struct elf_x86_64_backend_data *arch_data
3591 = get_elf_x86_64_arch_data (bed);
3592 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
3593 }
3594
3595 /* We now have determined the sizes of the various dynamic sections.
3596 Allocate memory for them. */
3597 relocs = FALSE;
3598 for (s = dynobj->sections; s != NULL; s = s->next)
3599 {
3600 if ((s->flags & SEC_LINKER_CREATED) == 0)
3601 continue;
3602
3603 if (s == htab->elf.splt
3604 || s == htab->elf.sgot
3605 || s == htab->elf.sgotplt
3606 || s == htab->elf.iplt
3607 || s == htab->elf.igotplt
3608 || s == htab->plt_bnd
3609 || s == htab->plt_got
3610 || s == htab->plt_eh_frame
3611 || s == htab->sdynbss)
3612 {
3613 /* Strip this section if we don't need it; see the
3614 comment below. */
3615 }
3616 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3617 {
3618 if (s->size != 0 && s != htab->elf.srelplt)
3619 relocs = TRUE;
3620
3621 /* We use the reloc_count field as a counter if we need
3622 to copy relocs into the output file. */
3623 if (s != htab->elf.srelplt)
3624 s->reloc_count = 0;
3625 }
3626 else
3627 {
3628 /* It's not one of our sections, so don't allocate space. */
3629 continue;
3630 }
3631
3632 if (s->size == 0)
3633 {
3634 /* If we don't need this section, strip it from the
3635 output file. This is mostly to handle .rela.bss and
3636 .rela.plt. We must create both sections in
3637 create_dynamic_sections, because they must be created
3638 before the linker maps input sections to output
3639 sections. The linker does that before
3640 adjust_dynamic_symbol is called, and it is that
3641 function which decides whether anything needs to go
3642 into these sections. */
3643
3644 s->flags |= SEC_EXCLUDE;
3645 continue;
3646 }
3647
3648 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3649 continue;
3650
3651 /* Allocate memory for the section contents. We use bfd_zalloc
3652 here in case unused entries are not reclaimed before the
3653 section's contents are written out. This should not happen,
3654 but this way if it does, we get a R_X86_64_NONE reloc instead
3655 of garbage. */
3656 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3657 if (s->contents == NULL)
3658 return FALSE;
3659 }
3660
3661 if (htab->plt_eh_frame != NULL
3662 && htab->plt_eh_frame->contents != NULL)
3663 {
3664 const struct elf_x86_64_backend_data *arch_data
3665 = get_elf_x86_64_arch_data (bed);
3666
3667 memcpy (htab->plt_eh_frame->contents,
3668 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3669 bfd_put_32 (dynobj, htab->elf.splt->size,
3670 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3671 }
3672
3673 if (htab->elf.dynamic_sections_created)
3674 {
3675 /* Add some entries to the .dynamic section. We fill in the
3676 values later, in elf_x86_64_finish_dynamic_sections, but we
3677 must add the entries now so that we get the correct size for
3678 the .dynamic section. The DT_DEBUG entry is filled in by the
3679 dynamic linker and used by the debugger. */
3680 #define add_dynamic_entry(TAG, VAL) \
3681 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3682
3683 if (bfd_link_executable (info))
3684 {
3685 if (!add_dynamic_entry (DT_DEBUG, 0))
3686 return FALSE;
3687 }
3688
3689 if (htab->elf.splt->size != 0)
3690 {
3691 /* DT_PLTGOT is used by prelink even if there is no PLT
3692 relocation. */
3693 if (!add_dynamic_entry (DT_PLTGOT, 0))
3694 return FALSE;
3695
3696 if (htab->elf.srelplt->size != 0)
3697 {
3698 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3699 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3700 || !add_dynamic_entry (DT_JMPREL, 0))
3701 return FALSE;
3702 }
3703
3704 if (htab->tlsdesc_plt
3705 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3706 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3707 return FALSE;
3708 }
3709
3710 if (relocs)
3711 {
3712 if (!add_dynamic_entry (DT_RELA, 0)
3713 || !add_dynamic_entry (DT_RELASZ, 0)
3714 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3715 return FALSE;
3716
3717 /* If any dynamic relocs apply to a read-only section,
3718 then we need a DT_TEXTREL entry. */
3719 if ((info->flags & DF_TEXTREL) == 0)
3720 elf_link_hash_traverse (&htab->elf,
3721 elf_x86_64_readonly_dynrelocs,
3722 info);
3723
3724 if ((info->flags & DF_TEXTREL) != 0)
3725 {
3726 if ((elf_tdata (output_bfd)->has_gnu_symbols
3727 & elf_gnu_symbol_ifunc) == elf_gnu_symbol_ifunc)
3728 {
3729 info->callbacks->einfo
3730 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3731 bfd_set_error (bfd_error_bad_value);
3732 return FALSE;
3733 }
3734
3735 if (!add_dynamic_entry (DT_TEXTREL, 0))
3736 return FALSE;
3737 }
3738 }
3739 }
3740 #undef add_dynamic_entry
3741
3742 return TRUE;
3743 }
3744
3745 static bfd_boolean
3746 elf_x86_64_always_size_sections (bfd *output_bfd,
3747 struct bfd_link_info *info)
3748 {
3749 asection *tls_sec = elf_hash_table (info)->tls_sec;
3750
3751 if (tls_sec)
3752 {
3753 struct elf_link_hash_entry *tlsbase;
3754
3755 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3756 "_TLS_MODULE_BASE_",
3757 FALSE, FALSE, FALSE);
3758
3759 if (tlsbase && tlsbase->type == STT_TLS)
3760 {
3761 struct elf_x86_64_link_hash_table *htab;
3762 struct bfd_link_hash_entry *bh = NULL;
3763 const struct elf_backend_data *bed
3764 = get_elf_backend_data (output_bfd);
3765
3766 htab = elf_x86_64_hash_table (info);
3767 if (htab == NULL)
3768 return FALSE;
3769
3770 if (!(_bfd_generic_link_add_one_symbol
3771 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3772 tls_sec, 0, NULL, FALSE,
3773 bed->collect, &bh)))
3774 return FALSE;
3775
3776 htab->tls_module_base = bh;
3777
3778 tlsbase = (struct elf_link_hash_entry *)bh;
3779 tlsbase->def_regular = 1;
3780 tlsbase->other = STV_HIDDEN;
3781 tlsbase->root.linker_def = 1;
3782 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3783 }
3784 }
3785
3786 return TRUE;
3787 }
3788
3789 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3790 executables. Rather than setting it to the beginning of the TLS
3791 section, we have to set it to the end. This function may be called
3792 multiple times, it is idempotent. */
3793
3794 static void
3795 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3796 {
3797 struct elf_x86_64_link_hash_table *htab;
3798 struct bfd_link_hash_entry *base;
3799
3800 if (!bfd_link_executable (info))
3801 return;
3802
3803 htab = elf_x86_64_hash_table (info);
3804 if (htab == NULL)
3805 return;
3806
3807 base = htab->tls_module_base;
3808 if (base == NULL)
3809 return;
3810
3811 base->u.def.value = htab->elf.tls_size;
3812 }
3813
3814 /* Return the base VMA address which should be subtracted from real addresses
3815 when resolving @dtpoff relocation.
3816 This is PT_TLS segment p_vaddr. */
3817
3818 static bfd_vma
3819 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3820 {
3821 /* If tls_sec is NULL, we should have signalled an error already. */
3822 if (elf_hash_table (info)->tls_sec == NULL)
3823 return 0;
3824 return elf_hash_table (info)->tls_sec->vma;
3825 }
3826
3827 /* Return the relocation value for @tpoff relocation
3828 if STT_TLS virtual address is ADDRESS. */
3829
3830 static bfd_vma
3831 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3832 {
3833 struct elf_link_hash_table *htab = elf_hash_table (info);
3834 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3835 bfd_vma static_tls_size;
3836
3837 /* If tls_segment is NULL, we should have signalled an error already. */
3838 if (htab->tls_sec == NULL)
3839 return 0;
3840
3841 /* Consider special static TLS alignment requirements. */
3842 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3843 return address - static_tls_size - htab->tls_sec->vma;
3844 }
3845
3846 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3847 branch? */
3848
3849 static bfd_boolean
3850 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3851 {
3852 /* Opcode Instruction
3853 0xe8 call
3854 0xe9 jump
3855 0x0f 0x8x conditional jump */
3856 return ((offset > 0
3857 && (contents [offset - 1] == 0xe8
3858 || contents [offset - 1] == 0xe9))
3859 || (offset > 1
3860 && contents [offset - 2] == 0x0f
3861 && (contents [offset - 1] & 0xf0) == 0x80));
3862 }
3863
3864 /* Relocate an x86_64 ELF section. */
3865
3866 static bfd_boolean
3867 elf_x86_64_relocate_section (bfd *output_bfd,
3868 struct bfd_link_info *info,
3869 bfd *input_bfd,
3870 asection *input_section,
3871 bfd_byte *contents,
3872 Elf_Internal_Rela *relocs,
3873 Elf_Internal_Sym *local_syms,
3874 asection **local_sections)
3875 {
3876 struct elf_x86_64_link_hash_table *htab;
3877 Elf_Internal_Shdr *symtab_hdr;
3878 struct elf_link_hash_entry **sym_hashes;
3879 bfd_vma *local_got_offsets;
3880 bfd_vma *local_tlsdesc_gotents;
3881 Elf_Internal_Rela *rel;
3882 Elf_Internal_Rela *wrel;
3883 Elf_Internal_Rela *relend;
3884 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3885
3886 BFD_ASSERT (is_x86_64_elf (input_bfd));
3887
3888 htab = elf_x86_64_hash_table (info);
3889 if (htab == NULL)
3890 return FALSE;
3891 symtab_hdr = &elf_symtab_hdr (input_bfd);
3892 sym_hashes = elf_sym_hashes (input_bfd);
3893 local_got_offsets = elf_local_got_offsets (input_bfd);
3894 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3895
3896 elf_x86_64_set_tls_module_base (info);
3897
3898 rel = wrel = relocs;
3899 relend = relocs + input_section->reloc_count;
3900 for (; rel < relend; wrel++, rel++)
3901 {
3902 unsigned int r_type;
3903 reloc_howto_type *howto;
3904 unsigned long r_symndx;
3905 struct elf_link_hash_entry *h;
3906 struct elf_x86_64_link_hash_entry *eh;
3907 Elf_Internal_Sym *sym;
3908 asection *sec;
3909 bfd_vma off, offplt, plt_offset;
3910 bfd_vma relocation;
3911 bfd_boolean unresolved_reloc;
3912 bfd_reloc_status_type r;
3913 int tls_type;
3914 asection *base_got, *resolved_plt;
3915 bfd_vma st_size;
3916
3917 r_type = ELF32_R_TYPE (rel->r_info);
3918 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3919 || r_type == (int) R_X86_64_GNU_VTENTRY)
3920 {
3921 if (wrel != rel)
3922 *wrel = *rel;
3923 continue;
3924 }
3925
3926 if (r_type >= (int) R_X86_64_standard)
3927 {
3928 (*_bfd_error_handler)
3929 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3930 input_bfd, input_section, r_type);
3931 bfd_set_error (bfd_error_bad_value);
3932 return FALSE;
3933 }
3934
3935 if (r_type != (int) R_X86_64_32
3936 || ABI_64_P (output_bfd))
3937 howto = x86_64_elf_howto_table + r_type;
3938 else
3939 howto = (x86_64_elf_howto_table
3940 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3941 r_symndx = htab->r_sym (rel->r_info);
3942 h = NULL;
3943 sym = NULL;
3944 sec = NULL;
3945 unresolved_reloc = FALSE;
3946 if (r_symndx < symtab_hdr->sh_info)
3947 {
3948 sym = local_syms + r_symndx;
3949 sec = local_sections[r_symndx];
3950
3951 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3952 &sec, rel);
3953 st_size = sym->st_size;
3954
3955 /* Relocate against local STT_GNU_IFUNC symbol. */
3956 if (!bfd_link_relocatable (info)
3957 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3958 {
3959 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3960 rel, FALSE);
3961 if (h == NULL)
3962 abort ();
3963
3964 /* Set STT_GNU_IFUNC symbol value. */
3965 h->root.u.def.value = sym->st_value;
3966 h->root.u.def.section = sec;
3967 }
3968 }
3969 else
3970 {
3971 bfd_boolean warned ATTRIBUTE_UNUSED;
3972 bfd_boolean ignored ATTRIBUTE_UNUSED;
3973
3974 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3975 r_symndx, symtab_hdr, sym_hashes,
3976 h, sec, relocation,
3977 unresolved_reloc, warned, ignored);
3978 st_size = h->size;
3979 }
3980
3981 if (sec != NULL && discarded_section (sec))
3982 {
3983 _bfd_clear_contents (howto, input_bfd, input_section,
3984 contents + rel->r_offset);
3985 wrel->r_offset = rel->r_offset;
3986 wrel->r_info = 0;
3987 wrel->r_addend = 0;
3988
3989 /* For ld -r, remove relocations in debug sections against
3990 sections defined in discarded sections. Not done for
3991 eh_frame editing code expects to be present. */
3992 if (bfd_link_relocatable (info)
3993 && (input_section->flags & SEC_DEBUGGING))
3994 wrel--;
3995
3996 continue;
3997 }
3998
3999 if (bfd_link_relocatable (info))
4000 {
4001 if (wrel != rel)
4002 *wrel = *rel;
4003 continue;
4004 }
4005
4006 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
4007 {
4008 if (r_type == R_X86_64_64)
4009 {
4010 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
4011 zero-extend it to 64bit if addend is zero. */
4012 r_type = R_X86_64_32;
4013 memset (contents + rel->r_offset + 4, 0, 4);
4014 }
4015 else if (r_type == R_X86_64_SIZE64)
4016 {
4017 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
4018 zero-extend it to 64bit if addend is zero. */
4019 r_type = R_X86_64_SIZE32;
4020 memset (contents + rel->r_offset + 4, 0, 4);
4021 }
4022 }
4023
4024 eh = (struct elf_x86_64_link_hash_entry *) h;
4025
4026 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4027 it here if it is defined in a non-shared object. */
4028 if (h != NULL
4029 && h->type == STT_GNU_IFUNC
4030 && h->def_regular)
4031 {
4032 bfd_vma plt_index;
4033 const char *name;
4034
4035 if ((input_section->flags & SEC_ALLOC) == 0)
4036 {
4037 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4038 sections because such sections are not SEC_ALLOC and
4039 thus ld.so will not process them. */
4040 if ((input_section->flags & SEC_DEBUGGING) != 0)
4041 continue;
4042 abort ();
4043 }
4044 else if (h->plt.offset == (bfd_vma) -1)
4045 abort ();
4046
4047 /* STT_GNU_IFUNC symbol must go through PLT. */
4048 if (htab->elf.splt != NULL)
4049 {
4050 if (htab->plt_bnd != NULL)
4051 {
4052 resolved_plt = htab->plt_bnd;
4053 plt_offset = eh->plt_bnd.offset;
4054 }
4055 else
4056 {
4057 resolved_plt = htab->elf.splt;
4058 plt_offset = h->plt.offset;
4059 }
4060 }
4061 else
4062 {
4063 resolved_plt = htab->elf.iplt;
4064 plt_offset = h->plt.offset;
4065 }
4066
4067 relocation = (resolved_plt->output_section->vma
4068 + resolved_plt->output_offset + plt_offset);
4069
4070 switch (r_type)
4071 {
4072 default:
4073 if (h->root.root.string)
4074 name = h->root.root.string;
4075 else
4076 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4077 NULL);
4078 (*_bfd_error_handler)
4079 (_("%B: relocation %s against STT_GNU_IFUNC "
4080 "symbol `%s' isn't handled by %s"), input_bfd,
4081 x86_64_elf_howto_table[r_type].name,
4082 name, __FUNCTION__);
4083 bfd_set_error (bfd_error_bad_value);
4084 return FALSE;
4085
4086 case R_X86_64_32S:
4087 if (bfd_link_pic (info))
4088 abort ();
4089 goto do_relocation;
4090
4091 case R_X86_64_32:
4092 if (ABI_64_P (output_bfd))
4093 goto do_relocation;
4094 /* FALLTHROUGH */
4095 case R_X86_64_64:
4096 if (rel->r_addend != 0)
4097 {
4098 if (h->root.root.string)
4099 name = h->root.root.string;
4100 else
4101 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4102 sym, NULL);
4103 (*_bfd_error_handler)
4104 (_("%B: relocation %s against STT_GNU_IFUNC "
4105 "symbol `%s' has non-zero addend: %d"),
4106 input_bfd, x86_64_elf_howto_table[r_type].name,
4107 name, rel->r_addend);
4108 bfd_set_error (bfd_error_bad_value);
4109 return FALSE;
4110 }
4111
4112 /* Generate dynamic relcoation only when there is a
4113 non-GOT reference in a shared object. */
4114 if (bfd_link_pic (info) && h->non_got_ref)
4115 {
4116 Elf_Internal_Rela outrel;
4117 asection *sreloc;
4118
4119 /* Need a dynamic relocation to get the real function
4120 address. */
4121 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
4122 info,
4123 input_section,
4124 rel->r_offset);
4125 if (outrel.r_offset == (bfd_vma) -1
4126 || outrel.r_offset == (bfd_vma) -2)
4127 abort ();
4128
4129 outrel.r_offset += (input_section->output_section->vma
4130 + input_section->output_offset);
4131
4132 if (h->dynindx == -1
4133 || h->forced_local
4134 || bfd_link_executable (info))
4135 {
4136 /* This symbol is resolved locally. */
4137 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4138 outrel.r_addend = (h->root.u.def.value
4139 + h->root.u.def.section->output_section->vma
4140 + h->root.u.def.section->output_offset);
4141 }
4142 else
4143 {
4144 outrel.r_info = htab->r_info (h->dynindx, r_type);
4145 outrel.r_addend = 0;
4146 }
4147
4148 sreloc = htab->elf.irelifunc;
4149 elf_append_rela (output_bfd, sreloc, &outrel);
4150
4151 /* If this reloc is against an external symbol, we
4152 do not want to fiddle with the addend. Otherwise,
4153 we need to include the symbol value so that it
4154 becomes an addend for the dynamic reloc. For an
4155 internal symbol, we have updated addend. */
4156 continue;
4157 }
4158 /* FALLTHROUGH */
4159 case R_X86_64_PC32:
4160 case R_X86_64_PC32_BND:
4161 case R_X86_64_PC64:
4162 case R_X86_64_PLT32:
4163 case R_X86_64_PLT32_BND:
4164 goto do_relocation;
4165
4166 case R_X86_64_GOTPCREL:
4167 case R_X86_64_GOTPCRELX:
4168 case R_X86_64_REX_GOTPCRELX:
4169 case R_X86_64_GOTPCREL64:
4170 base_got = htab->elf.sgot;
4171 off = h->got.offset;
4172
4173 if (base_got == NULL)
4174 abort ();
4175
4176 if (off == (bfd_vma) -1)
4177 {
4178 /* We can't use h->got.offset here to save state, or
4179 even just remember the offset, as finish_dynamic_symbol
4180 would use that as offset into .got. */
4181
4182 if (htab->elf.splt != NULL)
4183 {
4184 plt_index = h->plt.offset / plt_entry_size - 1;
4185 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4186 base_got = htab->elf.sgotplt;
4187 }
4188 else
4189 {
4190 plt_index = h->plt.offset / plt_entry_size;
4191 off = plt_index * GOT_ENTRY_SIZE;
4192 base_got = htab->elf.igotplt;
4193 }
4194
4195 if (h->dynindx == -1
4196 || h->forced_local
4197 || info->symbolic)
4198 {
4199 /* This references the local defitionion. We must
4200 initialize this entry in the global offset table.
4201 Since the offset must always be a multiple of 8,
4202 we use the least significant bit to record
4203 whether we have initialized it already.
4204
4205 When doing a dynamic link, we create a .rela.got
4206 relocation entry to initialize the value. This
4207 is done in the finish_dynamic_symbol routine. */
4208 if ((off & 1) != 0)
4209 off &= ~1;
4210 else
4211 {
4212 bfd_put_64 (output_bfd, relocation,
4213 base_got->contents + off);
4214 /* Note that this is harmless for the GOTPLT64
4215 case, as -1 | 1 still is -1. */
4216 h->got.offset |= 1;
4217 }
4218 }
4219 }
4220
4221 relocation = (base_got->output_section->vma
4222 + base_got->output_offset + off);
4223
4224 goto do_relocation;
4225 }
4226 }
4227
4228 /* When generating a shared object, the relocations handled here are
4229 copied into the output file to be resolved at run time. */
4230 switch (r_type)
4231 {
4232 case R_X86_64_GOT32:
4233 case R_X86_64_GOT64:
4234 /* Relocation is to the entry for this symbol in the global
4235 offset table. */
4236 case R_X86_64_GOTPCREL:
4237 case R_X86_64_GOTPCRELX:
4238 case R_X86_64_REX_GOTPCRELX:
4239 case R_X86_64_GOTPCREL64:
4240 /* Use global offset table entry as symbol value. */
4241 case R_X86_64_GOTPLT64:
4242 /* This is obsolete and treated the the same as GOT64. */
4243 base_got = htab->elf.sgot;
4244
4245 if (htab->elf.sgot == NULL)
4246 abort ();
4247
4248 if (h != NULL)
4249 {
4250 bfd_boolean dyn;
4251
4252 off = h->got.offset;
4253 if (h->needs_plt
4254 && h->plt.offset != (bfd_vma)-1
4255 && off == (bfd_vma)-1)
4256 {
4257 /* We can't use h->got.offset here to save
4258 state, or even just remember the offset, as
4259 finish_dynamic_symbol would use that as offset into
4260 .got. */
4261 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
4262 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4263 base_got = htab->elf.sgotplt;
4264 }
4265
4266 dyn = htab->elf.dynamic_sections_created;
4267
4268 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
4269 || (bfd_link_pic (info)
4270 && SYMBOL_REFERENCES_LOCAL (info, h))
4271 || (ELF_ST_VISIBILITY (h->other)
4272 && h->root.type == bfd_link_hash_undefweak))
4273 {
4274 /* This is actually a static link, or it is a -Bsymbolic
4275 link and the symbol is defined locally, or the symbol
4276 was forced to be local because of a version file. We
4277 must initialize this entry in the global offset table.
4278 Since the offset must always be a multiple of 8, we
4279 use the least significant bit to record whether we
4280 have initialized it already.
4281
4282 When doing a dynamic link, we create a .rela.got
4283 relocation entry to initialize the value. This is
4284 done in the finish_dynamic_symbol routine. */
4285 if ((off & 1) != 0)
4286 off &= ~1;
4287 else
4288 {
4289 bfd_put_64 (output_bfd, relocation,
4290 base_got->contents + off);
4291 /* Note that this is harmless for the GOTPLT64 case,
4292 as -1 | 1 still is -1. */
4293 h->got.offset |= 1;
4294 }
4295 }
4296 else
4297 unresolved_reloc = FALSE;
4298 }
4299 else
4300 {
4301 if (local_got_offsets == NULL)
4302 abort ();
4303
4304 off = local_got_offsets[r_symndx];
4305
4306 /* The offset must always be a multiple of 8. We use
4307 the least significant bit to record whether we have
4308 already generated the necessary reloc. */
4309 if ((off & 1) != 0)
4310 off &= ~1;
4311 else
4312 {
4313 bfd_put_64 (output_bfd, relocation,
4314 base_got->contents + off);
4315
4316 if (bfd_link_pic (info))
4317 {
4318 asection *s;
4319 Elf_Internal_Rela outrel;
4320
4321 /* We need to generate a R_X86_64_RELATIVE reloc
4322 for the dynamic linker. */
4323 s = htab->elf.srelgot;
4324 if (s == NULL)
4325 abort ();
4326
4327 outrel.r_offset = (base_got->output_section->vma
4328 + base_got->output_offset
4329 + off);
4330 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4331 outrel.r_addend = relocation;
4332 elf_append_rela (output_bfd, s, &outrel);
4333 }
4334
4335 local_got_offsets[r_symndx] |= 1;
4336 }
4337 }
4338
4339 if (off >= (bfd_vma) -2)
4340 abort ();
4341
4342 relocation = base_got->output_section->vma
4343 + base_got->output_offset + off;
4344 if (r_type != R_X86_64_GOTPCREL
4345 && r_type != R_X86_64_GOTPCRELX
4346 && r_type != R_X86_64_REX_GOTPCRELX
4347 && r_type != R_X86_64_GOTPCREL64)
4348 relocation -= htab->elf.sgotplt->output_section->vma
4349 - htab->elf.sgotplt->output_offset;
4350
4351 break;
4352
4353 case R_X86_64_GOTOFF64:
4354 /* Relocation is relative to the start of the global offset
4355 table. */
4356
4357 /* Check to make sure it isn't a protected function or data
4358 symbol for shared library since it may not be local when
4359 used as function address or with copy relocation. We also
4360 need to make sure that a symbol is referenced locally. */
4361 if (bfd_link_pic (info) && h)
4362 {
4363 if (!h->def_regular)
4364 {
4365 const char *v;
4366
4367 switch (ELF_ST_VISIBILITY (h->other))
4368 {
4369 case STV_HIDDEN:
4370 v = _("hidden symbol");
4371 break;
4372 case STV_INTERNAL:
4373 v = _("internal symbol");
4374 break;
4375 case STV_PROTECTED:
4376 v = _("protected symbol");
4377 break;
4378 default:
4379 v = _("symbol");
4380 break;
4381 }
4382
4383 (*_bfd_error_handler)
4384 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4385 input_bfd, v, h->root.root.string);
4386 bfd_set_error (bfd_error_bad_value);
4387 return FALSE;
4388 }
4389 else if (!bfd_link_executable (info)
4390 && !SYMBOL_REFERENCES_LOCAL (info, h)
4391 && (h->type == STT_FUNC
4392 || h->type == STT_OBJECT)
4393 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4394 {
4395 (*_bfd_error_handler)
4396 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4397 input_bfd,
4398 h->type == STT_FUNC ? "function" : "data",
4399 h->root.root.string);
4400 bfd_set_error (bfd_error_bad_value);
4401 return FALSE;
4402 }
4403 }
4404
4405 /* Note that sgot is not involved in this
4406 calculation. We always want the start of .got.plt. If we
4407 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4408 permitted by the ABI, we might have to change this
4409 calculation. */
4410 relocation -= htab->elf.sgotplt->output_section->vma
4411 + htab->elf.sgotplt->output_offset;
4412 break;
4413
4414 case R_X86_64_GOTPC32:
4415 case R_X86_64_GOTPC64:
4416 /* Use global offset table as symbol value. */
4417 relocation = htab->elf.sgotplt->output_section->vma
4418 + htab->elf.sgotplt->output_offset;
4419 unresolved_reloc = FALSE;
4420 break;
4421
4422 case R_X86_64_PLTOFF64:
4423 /* Relocation is PLT entry relative to GOT. For local
4424 symbols it's the symbol itself relative to GOT. */
4425 if (h != NULL
4426 /* See PLT32 handling. */
4427 && h->plt.offset != (bfd_vma) -1
4428 && htab->elf.splt != NULL)
4429 {
4430 if (htab->plt_bnd != NULL)
4431 {
4432 resolved_plt = htab->plt_bnd;
4433 plt_offset = eh->plt_bnd.offset;
4434 }
4435 else
4436 {
4437 resolved_plt = htab->elf.splt;
4438 plt_offset = h->plt.offset;
4439 }
4440
4441 relocation = (resolved_plt->output_section->vma
4442 + resolved_plt->output_offset
4443 + plt_offset);
4444 unresolved_reloc = FALSE;
4445 }
4446
4447 relocation -= htab->elf.sgotplt->output_section->vma
4448 + htab->elf.sgotplt->output_offset;
4449 break;
4450
4451 case R_X86_64_PLT32:
4452 case R_X86_64_PLT32_BND:
4453 /* Relocation is to the entry for this symbol in the
4454 procedure linkage table. */
4455
4456 /* Resolve a PLT32 reloc against a local symbol directly,
4457 without using the procedure linkage table. */
4458 if (h == NULL)
4459 break;
4460
4461 if ((h->plt.offset == (bfd_vma) -1
4462 && eh->plt_got.offset == (bfd_vma) -1)
4463 || htab->elf.splt == NULL)
4464 {
4465 /* We didn't make a PLT entry for this symbol. This
4466 happens when statically linking PIC code, or when
4467 using -Bsymbolic. */
4468 break;
4469 }
4470
4471 if (h->plt.offset != (bfd_vma) -1)
4472 {
4473 if (htab->plt_bnd != NULL)
4474 {
4475 resolved_plt = htab->plt_bnd;
4476 plt_offset = eh->plt_bnd.offset;
4477 }
4478 else
4479 {
4480 resolved_plt = htab->elf.splt;
4481 plt_offset = h->plt.offset;
4482 }
4483 }
4484 else
4485 {
4486 /* Use the GOT PLT. */
4487 resolved_plt = htab->plt_got;
4488 plt_offset = eh->plt_got.offset;
4489 }
4490
4491 relocation = (resolved_plt->output_section->vma
4492 + resolved_plt->output_offset
4493 + plt_offset);
4494 unresolved_reloc = FALSE;
4495 break;
4496
4497 case R_X86_64_SIZE32:
4498 case R_X86_64_SIZE64:
4499 /* Set to symbol size. */
4500 relocation = st_size;
4501 goto direct;
4502
4503 case R_X86_64_PC8:
4504 case R_X86_64_PC16:
4505 case R_X86_64_PC32:
4506 case R_X86_64_PC32_BND:
4507 /* Don't complain about -fPIC if the symbol is undefined when
4508 building executable. */
4509 if (bfd_link_pic (info)
4510 && (input_section->flags & SEC_ALLOC) != 0
4511 && (input_section->flags & SEC_READONLY) != 0
4512 && h != NULL
4513 && !(bfd_link_executable (info)
4514 && h->root.type == bfd_link_hash_undefined))
4515 {
4516 bfd_boolean fail = FALSE;
4517 bfd_boolean branch
4518 = ((r_type == R_X86_64_PC32
4519 || r_type == R_X86_64_PC32_BND)
4520 && is_32bit_relative_branch (contents, rel->r_offset));
4521
4522 if (SYMBOL_REFERENCES_LOCAL (info, h))
4523 {
4524 /* Symbol is referenced locally. Make sure it is
4525 defined locally or for a branch. */
4526 fail = !h->def_regular && !branch;
4527 }
4528 else if (!(bfd_link_executable (info)
4529 && (h->needs_copy || eh->needs_copy)))
4530 {
4531 /* Symbol doesn't need copy reloc and isn't referenced
4532 locally. We only allow branch to symbol with
4533 non-default visibility. */
4534 fail = (!branch
4535 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4536 }
4537
4538 if (fail)
4539 {
4540 const char *fmt;
4541 const char *v;
4542 const char *pic = "";
4543
4544 switch (ELF_ST_VISIBILITY (h->other))
4545 {
4546 case STV_HIDDEN:
4547 v = _("hidden symbol");
4548 break;
4549 case STV_INTERNAL:
4550 v = _("internal symbol");
4551 break;
4552 case STV_PROTECTED:
4553 v = _("protected symbol");
4554 break;
4555 default:
4556 v = _("symbol");
4557 pic = _("; recompile with -fPIC");
4558 break;
4559 }
4560
4561 if (h->def_regular)
4562 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4563 else
4564 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4565
4566 (*_bfd_error_handler) (fmt, input_bfd,
4567 x86_64_elf_howto_table[r_type].name,
4568 v, h->root.root.string, pic);
4569 bfd_set_error (bfd_error_bad_value);
4570 return FALSE;
4571 }
4572 }
4573 /* Fall through. */
4574
4575 case R_X86_64_8:
4576 case R_X86_64_16:
4577 case R_X86_64_32:
4578 case R_X86_64_PC64:
4579 case R_X86_64_64:
4580 /* FIXME: The ABI says the linker should make sure the value is
4581 the same when it's zeroextended to 64 bit. */
4582
4583 direct:
4584 if ((input_section->flags & SEC_ALLOC) == 0)
4585 break;
4586
4587 /* Don't copy a pc-relative relocation into the output file
4588 if the symbol needs copy reloc or the symbol is undefined
4589 when building executable. Copy dynamic function pointer
4590 relocations. */
4591 if ((bfd_link_pic (info)
4592 && !(bfd_link_executable (info)
4593 && h != NULL
4594 && (h->needs_copy
4595 || eh->needs_copy
4596 || h->root.type == bfd_link_hash_undefined)
4597 && IS_X86_64_PCREL_TYPE (r_type))
4598 && (h == NULL
4599 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4600 || h->root.type != bfd_link_hash_undefweak)
4601 && ((! IS_X86_64_PCREL_TYPE (r_type)
4602 && r_type != R_X86_64_SIZE32
4603 && r_type != R_X86_64_SIZE64)
4604 || ! SYMBOL_CALLS_LOCAL (info, h)))
4605 || (ELIMINATE_COPY_RELOCS
4606 && !bfd_link_pic (info)
4607 && h != NULL
4608 && h->dynindx != -1
4609 && (!h->non_got_ref || eh->func_pointer_refcount > 0)
4610 && ((h->def_dynamic
4611 && !h->def_regular)
4612 || h->root.type == bfd_link_hash_undefweak
4613 || h->root.type == bfd_link_hash_undefined)))
4614 {
4615 Elf_Internal_Rela outrel;
4616 bfd_boolean skip, relocate;
4617 asection *sreloc;
4618
4619 /* When generating a shared object, these relocations
4620 are copied into the output file to be resolved at run
4621 time. */
4622 skip = FALSE;
4623 relocate = FALSE;
4624
4625 outrel.r_offset =
4626 _bfd_elf_section_offset (output_bfd, info, input_section,
4627 rel->r_offset);
4628 if (outrel.r_offset == (bfd_vma) -1)
4629 skip = TRUE;
4630 else if (outrel.r_offset == (bfd_vma) -2)
4631 skip = TRUE, relocate = TRUE;
4632
4633 outrel.r_offset += (input_section->output_section->vma
4634 + input_section->output_offset);
4635
4636 if (skip)
4637 memset (&outrel, 0, sizeof outrel);
4638
4639 /* h->dynindx may be -1 if this symbol was marked to
4640 become local. */
4641 else if (h != NULL
4642 && h->dynindx != -1
4643 && (IS_X86_64_PCREL_TYPE (r_type)
4644 || ! bfd_link_pic (info)
4645 || ! SYMBOLIC_BIND (info, h)
4646 || ! h->def_regular))
4647 {
4648 outrel.r_info = htab->r_info (h->dynindx, r_type);
4649 outrel.r_addend = rel->r_addend;
4650 }
4651 else
4652 {
4653 /* This symbol is local, or marked to become local. */
4654 if (r_type == htab->pointer_r_type)
4655 {
4656 relocate = TRUE;
4657 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4658 outrel.r_addend = relocation + rel->r_addend;
4659 }
4660 else if (r_type == R_X86_64_64
4661 && !ABI_64_P (output_bfd))
4662 {
4663 relocate = TRUE;
4664 outrel.r_info = htab->r_info (0,
4665 R_X86_64_RELATIVE64);
4666 outrel.r_addend = relocation + rel->r_addend;
4667 /* Check addend overflow. */
4668 if ((outrel.r_addend & 0x80000000)
4669 != (rel->r_addend & 0x80000000))
4670 {
4671 const char *name;
4672 int addend = rel->r_addend;
4673 if (h && h->root.root.string)
4674 name = h->root.root.string;
4675 else
4676 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4677 sym, NULL);
4678 if (addend < 0)
4679 (*_bfd_error_handler)
4680 (_("%B: addend -0x%x in relocation %s against "
4681 "symbol `%s' at 0x%lx in section `%A' is "
4682 "out of range"),
4683 input_bfd, input_section, addend,
4684 x86_64_elf_howto_table[r_type].name,
4685 name, (unsigned long) rel->r_offset);
4686 else
4687 (*_bfd_error_handler)
4688 (_("%B: addend 0x%x in relocation %s against "
4689 "symbol `%s' at 0x%lx in section `%A' is "
4690 "out of range"),
4691 input_bfd, input_section, addend,
4692 x86_64_elf_howto_table[r_type].name,
4693 name, (unsigned long) rel->r_offset);
4694 bfd_set_error (bfd_error_bad_value);
4695 return FALSE;
4696 }
4697 }
4698 else
4699 {
4700 long sindx;
4701
4702 if (bfd_is_abs_section (sec))
4703 sindx = 0;
4704 else if (sec == NULL || sec->owner == NULL)
4705 {
4706 bfd_set_error (bfd_error_bad_value);
4707 return FALSE;
4708 }
4709 else
4710 {
4711 asection *osec;
4712
4713 /* We are turning this relocation into one
4714 against a section symbol. It would be
4715 proper to subtract the symbol's value,
4716 osec->vma, from the emitted reloc addend,
4717 but ld.so expects buggy relocs. */
4718 osec = sec->output_section;
4719 sindx = elf_section_data (osec)->dynindx;
4720 if (sindx == 0)
4721 {
4722 asection *oi = htab->elf.text_index_section;
4723 sindx = elf_section_data (oi)->dynindx;
4724 }
4725 BFD_ASSERT (sindx != 0);
4726 }
4727
4728 outrel.r_info = htab->r_info (sindx, r_type);
4729 outrel.r_addend = relocation + rel->r_addend;
4730 }
4731 }
4732
4733 sreloc = elf_section_data (input_section)->sreloc;
4734
4735 if (sreloc == NULL || sreloc->contents == NULL)
4736 {
4737 r = bfd_reloc_notsupported;
4738 goto check_relocation_error;
4739 }
4740
4741 elf_append_rela (output_bfd, sreloc, &outrel);
4742
4743 /* If this reloc is against an external symbol, we do
4744 not want to fiddle with the addend. Otherwise, we
4745 need to include the symbol value so that it becomes
4746 an addend for the dynamic reloc. */
4747 if (! relocate)
4748 continue;
4749 }
4750
4751 break;
4752
4753 case R_X86_64_TLSGD:
4754 case R_X86_64_GOTPC32_TLSDESC:
4755 case R_X86_64_TLSDESC_CALL:
4756 case R_X86_64_GOTTPOFF:
4757 tls_type = GOT_UNKNOWN;
4758 if (h == NULL && local_got_offsets)
4759 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
4760 else if (h != NULL)
4761 tls_type = elf_x86_64_hash_entry (h)->tls_type;
4762
4763 if (! elf_x86_64_tls_transition (info, input_bfd,
4764 input_section, contents,
4765 symtab_hdr, sym_hashes,
4766 &r_type, tls_type, rel,
4767 relend, h, r_symndx))
4768 return FALSE;
4769
4770 if (r_type == R_X86_64_TPOFF32)
4771 {
4772 bfd_vma roff = rel->r_offset;
4773
4774 BFD_ASSERT (! unresolved_reloc);
4775
4776 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4777 {
4778 /* GD->LE transition. For 64bit, change
4779 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4780 .word 0x6666; rex64; call __tls_get_addr
4781 into:
4782 movq %fs:0, %rax
4783 leaq foo@tpoff(%rax), %rax
4784 For 32bit, change
4785 leaq foo@tlsgd(%rip), %rdi
4786 .word 0x6666; rex64; call __tls_get_addr
4787 into:
4788 movl %fs:0, %eax
4789 leaq foo@tpoff(%rax), %rax
4790 For largepic, change:
4791 leaq foo@tlsgd(%rip), %rdi
4792 movabsq $__tls_get_addr@pltoff, %rax
4793 addq %rbx, %rax
4794 call *%rax
4795 into:
4796 movq %fs:0, %rax
4797 leaq foo@tpoff(%rax), %rax
4798 nopw 0x0(%rax,%rax,1) */
4799 int largepic = 0;
4800 if (ABI_64_P (output_bfd)
4801 && contents[roff + 5] == (bfd_byte) '\xb8')
4802 {
4803 memcpy (contents + roff - 3,
4804 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4805 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4806 largepic = 1;
4807 }
4808 else if (ABI_64_P (output_bfd))
4809 memcpy (contents + roff - 4,
4810 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4811 16);
4812 else
4813 memcpy (contents + roff - 3,
4814 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4815 15);
4816 bfd_put_32 (output_bfd,
4817 elf_x86_64_tpoff (info, relocation),
4818 contents + roff + 8 + largepic);
4819 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4820 rel++;
4821 wrel++;
4822 continue;
4823 }
4824 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4825 {
4826 /* GDesc -> LE transition.
4827 It's originally something like:
4828 leaq x@tlsdesc(%rip), %rax
4829
4830 Change it to:
4831 movl $x@tpoff, %rax. */
4832
4833 unsigned int val, type;
4834
4835 type = bfd_get_8 (input_bfd, contents + roff - 3);
4836 val = bfd_get_8 (input_bfd, contents + roff - 1);
4837 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4838 contents + roff - 3);
4839 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4840 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4841 contents + roff - 1);
4842 bfd_put_32 (output_bfd,
4843 elf_x86_64_tpoff (info, relocation),
4844 contents + roff);
4845 continue;
4846 }
4847 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4848 {
4849 /* GDesc -> LE transition.
4850 It's originally:
4851 call *(%rax)
4852 Turn it into:
4853 xchg %ax,%ax. */
4854 bfd_put_8 (output_bfd, 0x66, contents + roff);
4855 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4856 continue;
4857 }
4858 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4859 {
4860 /* IE->LE transition:
4861 For 64bit, originally it can be one of:
4862 movq foo@gottpoff(%rip), %reg
4863 addq foo@gottpoff(%rip), %reg
4864 We change it into:
4865 movq $foo, %reg
4866 leaq foo(%reg), %reg
4867 addq $foo, %reg.
4868 For 32bit, originally it can be one of:
4869 movq foo@gottpoff(%rip), %reg
4870 addl foo@gottpoff(%rip), %reg
4871 We change it into:
4872 movq $foo, %reg
4873 leal foo(%reg), %reg
4874 addl $foo, %reg. */
4875
4876 unsigned int val, type, reg;
4877
4878 if (roff >= 3)
4879 val = bfd_get_8 (input_bfd, contents + roff - 3);
4880 else
4881 val = 0;
4882 type = bfd_get_8 (input_bfd, contents + roff - 2);
4883 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4884 reg >>= 3;
4885 if (type == 0x8b)
4886 {
4887 /* movq */
4888 if (val == 0x4c)
4889 bfd_put_8 (output_bfd, 0x49,
4890 contents + roff - 3);
4891 else if (!ABI_64_P (output_bfd) && val == 0x44)
4892 bfd_put_8 (output_bfd, 0x41,
4893 contents + roff - 3);
4894 bfd_put_8 (output_bfd, 0xc7,
4895 contents + roff - 2);
4896 bfd_put_8 (output_bfd, 0xc0 | reg,
4897 contents + roff - 1);
4898 }
4899 else if (reg == 4)
4900 {
4901 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4902 is special */
4903 if (val == 0x4c)
4904 bfd_put_8 (output_bfd, 0x49,
4905 contents + roff - 3);
4906 else if (!ABI_64_P (output_bfd) && val == 0x44)
4907 bfd_put_8 (output_bfd, 0x41,
4908 contents + roff - 3);
4909 bfd_put_8 (output_bfd, 0x81,
4910 contents + roff - 2);
4911 bfd_put_8 (output_bfd, 0xc0 | reg,
4912 contents + roff - 1);
4913 }
4914 else
4915 {
4916 /* addq/addl -> leaq/leal */
4917 if (val == 0x4c)
4918 bfd_put_8 (output_bfd, 0x4d,
4919 contents + roff - 3);
4920 else if (!ABI_64_P (output_bfd) && val == 0x44)
4921 bfd_put_8 (output_bfd, 0x45,
4922 contents + roff - 3);
4923 bfd_put_8 (output_bfd, 0x8d,
4924 contents + roff - 2);
4925 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4926 contents + roff - 1);
4927 }
4928 bfd_put_32 (output_bfd,
4929 elf_x86_64_tpoff (info, relocation),
4930 contents + roff);
4931 continue;
4932 }
4933 else
4934 BFD_ASSERT (FALSE);
4935 }
4936
4937 if (htab->elf.sgot == NULL)
4938 abort ();
4939
4940 if (h != NULL)
4941 {
4942 off = h->got.offset;
4943 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4944 }
4945 else
4946 {
4947 if (local_got_offsets == NULL)
4948 abort ();
4949
4950 off = local_got_offsets[r_symndx];
4951 offplt = local_tlsdesc_gotents[r_symndx];
4952 }
4953
4954 if ((off & 1) != 0)
4955 off &= ~1;
4956 else
4957 {
4958 Elf_Internal_Rela outrel;
4959 int dr_type, indx;
4960 asection *sreloc;
4961
4962 if (htab->elf.srelgot == NULL)
4963 abort ();
4964
4965 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4966
4967 if (GOT_TLS_GDESC_P (tls_type))
4968 {
4969 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4970 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4971 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4972 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4973 + htab->elf.sgotplt->output_offset
4974 + offplt
4975 + htab->sgotplt_jump_table_size);
4976 sreloc = htab->elf.srelplt;
4977 if (indx == 0)
4978 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4979 else
4980 outrel.r_addend = 0;
4981 elf_append_rela (output_bfd, sreloc, &outrel);
4982 }
4983
4984 sreloc = htab->elf.srelgot;
4985
4986 outrel.r_offset = (htab->elf.sgot->output_section->vma
4987 + htab->elf.sgot->output_offset + off);
4988
4989 if (GOT_TLS_GD_P (tls_type))
4990 dr_type = R_X86_64_DTPMOD64;
4991 else if (GOT_TLS_GDESC_P (tls_type))
4992 goto dr_done;
4993 else
4994 dr_type = R_X86_64_TPOFF64;
4995
4996 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4997 outrel.r_addend = 0;
4998 if ((dr_type == R_X86_64_TPOFF64
4999 || dr_type == R_X86_64_TLSDESC) && indx == 0)
5000 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
5001 outrel.r_info = htab->r_info (indx, dr_type);
5002
5003 elf_append_rela (output_bfd, sreloc, &outrel);
5004
5005 if (GOT_TLS_GD_P (tls_type))
5006 {
5007 if (indx == 0)
5008 {
5009 BFD_ASSERT (! unresolved_reloc);
5010 bfd_put_64 (output_bfd,
5011 relocation - elf_x86_64_dtpoff_base (info),
5012 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5013 }
5014 else
5015 {
5016 bfd_put_64 (output_bfd, 0,
5017 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5018 outrel.r_info = htab->r_info (indx,
5019 R_X86_64_DTPOFF64);
5020 outrel.r_offset += GOT_ENTRY_SIZE;
5021 elf_append_rela (output_bfd, sreloc,
5022 &outrel);
5023 }
5024 }
5025
5026 dr_done:
5027 if (h != NULL)
5028 h->got.offset |= 1;
5029 else
5030 local_got_offsets[r_symndx] |= 1;
5031 }
5032
5033 if (off >= (bfd_vma) -2
5034 && ! GOT_TLS_GDESC_P (tls_type))
5035 abort ();
5036 if (r_type == ELF32_R_TYPE (rel->r_info))
5037 {
5038 if (r_type == R_X86_64_GOTPC32_TLSDESC
5039 || r_type == R_X86_64_TLSDESC_CALL)
5040 relocation = htab->elf.sgotplt->output_section->vma
5041 + htab->elf.sgotplt->output_offset
5042 + offplt + htab->sgotplt_jump_table_size;
5043 else
5044 relocation = htab->elf.sgot->output_section->vma
5045 + htab->elf.sgot->output_offset + off;
5046 unresolved_reloc = FALSE;
5047 }
5048 else
5049 {
5050 bfd_vma roff = rel->r_offset;
5051
5052 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
5053 {
5054 /* GD->IE transition. For 64bit, change
5055 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5056 .word 0x6666; rex64; call __tls_get_addr@plt
5057 into:
5058 movq %fs:0, %rax
5059 addq foo@gottpoff(%rip), %rax
5060 For 32bit, change
5061 leaq foo@tlsgd(%rip), %rdi
5062 .word 0x6666; rex64; call __tls_get_addr@plt
5063 into:
5064 movl %fs:0, %eax
5065 addq foo@gottpoff(%rip), %rax
5066 For largepic, change:
5067 leaq foo@tlsgd(%rip), %rdi
5068 movabsq $__tls_get_addr@pltoff, %rax
5069 addq %rbx, %rax
5070 call *%rax
5071 into:
5072 movq %fs:0, %rax
5073 addq foo@gottpoff(%rax), %rax
5074 nopw 0x0(%rax,%rax,1) */
5075 int largepic = 0;
5076 if (ABI_64_P (output_bfd)
5077 && contents[roff + 5] == (bfd_byte) '\xb8')
5078 {
5079 memcpy (contents + roff - 3,
5080 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5081 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5082 largepic = 1;
5083 }
5084 else if (ABI_64_P (output_bfd))
5085 memcpy (contents + roff - 4,
5086 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5087 16);
5088 else
5089 memcpy (contents + roff - 3,
5090 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5091 15);
5092
5093 relocation = (htab->elf.sgot->output_section->vma
5094 + htab->elf.sgot->output_offset + off
5095 - roff
5096 - largepic
5097 - input_section->output_section->vma
5098 - input_section->output_offset
5099 - 12);
5100 bfd_put_32 (output_bfd, relocation,
5101 contents + roff + 8 + largepic);
5102 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5103 rel++;
5104 wrel++;
5105 continue;
5106 }
5107 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
5108 {
5109 /* GDesc -> IE transition.
5110 It's originally something like:
5111 leaq x@tlsdesc(%rip), %rax
5112
5113 Change it to:
5114 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5115
5116 /* Now modify the instruction as appropriate. To
5117 turn a leaq into a movq in the form we use it, it
5118 suffices to change the second byte from 0x8d to
5119 0x8b. */
5120 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
5121
5122 bfd_put_32 (output_bfd,
5123 htab->elf.sgot->output_section->vma
5124 + htab->elf.sgot->output_offset + off
5125 - rel->r_offset
5126 - input_section->output_section->vma
5127 - input_section->output_offset
5128 - 4,
5129 contents + roff);
5130 continue;
5131 }
5132 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
5133 {
5134 /* GDesc -> IE transition.
5135 It's originally:
5136 call *(%rax)
5137
5138 Change it to:
5139 xchg %ax, %ax. */
5140
5141 bfd_put_8 (output_bfd, 0x66, contents + roff);
5142 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5143 continue;
5144 }
5145 else
5146 BFD_ASSERT (FALSE);
5147 }
5148 break;
5149
5150 case R_X86_64_TLSLD:
5151 if (! elf_x86_64_tls_transition (info, input_bfd,
5152 input_section, contents,
5153 symtab_hdr, sym_hashes,
5154 &r_type, GOT_UNKNOWN,
5155 rel, relend, h, r_symndx))
5156 return FALSE;
5157
5158 if (r_type != R_X86_64_TLSLD)
5159 {
5160 /* LD->LE transition:
5161 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
5162 For 64bit, we change it into:
5163 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
5164 For 32bit, we change it into:
5165 nopl 0x0(%rax); movl %fs:0, %eax.
5166 For largepic, change:
5167 leaq foo@tlsgd(%rip), %rdi
5168 movabsq $__tls_get_addr@pltoff, %rax
5169 addq %rbx, %rax
5170 call *%rax
5171 into:
5172 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
5173 movq %fs:0, %eax */
5174
5175 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
5176 if (ABI_64_P (output_bfd)
5177 && contents[rel->r_offset + 5] == (bfd_byte) '\xb8')
5178 memcpy (contents + rel->r_offset - 3,
5179 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5180 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5181 else if (ABI_64_P (output_bfd))
5182 memcpy (contents + rel->r_offset - 3,
5183 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5184 else
5185 memcpy (contents + rel->r_offset - 3,
5186 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5187 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5188 rel++;
5189 wrel++;
5190 continue;
5191 }
5192
5193 if (htab->elf.sgot == NULL)
5194 abort ();
5195
5196 off = htab->tls_ld_got.offset;
5197 if (off & 1)
5198 off &= ~1;
5199 else
5200 {
5201 Elf_Internal_Rela outrel;
5202
5203 if (htab->elf.srelgot == NULL)
5204 abort ();
5205
5206 outrel.r_offset = (htab->elf.sgot->output_section->vma
5207 + htab->elf.sgot->output_offset + off);
5208
5209 bfd_put_64 (output_bfd, 0,
5210 htab->elf.sgot->contents + off);
5211 bfd_put_64 (output_bfd, 0,
5212 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5213 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
5214 outrel.r_addend = 0;
5215 elf_append_rela (output_bfd, htab->elf.srelgot,
5216 &outrel);
5217 htab->tls_ld_got.offset |= 1;
5218 }
5219 relocation = htab->elf.sgot->output_section->vma
5220 + htab->elf.sgot->output_offset + off;
5221 unresolved_reloc = FALSE;
5222 break;
5223
5224 case R_X86_64_DTPOFF32:
5225 if (!bfd_link_executable (info)
5226 || (input_section->flags & SEC_CODE) == 0)
5227 relocation -= elf_x86_64_dtpoff_base (info);
5228 else
5229 relocation = elf_x86_64_tpoff (info, relocation);
5230 break;
5231
5232 case R_X86_64_TPOFF32:
5233 case R_X86_64_TPOFF64:
5234 BFD_ASSERT (bfd_link_executable (info));
5235 relocation = elf_x86_64_tpoff (info, relocation);
5236 break;
5237
5238 case R_X86_64_DTPOFF64:
5239 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
5240 relocation -= elf_x86_64_dtpoff_base (info);
5241 break;
5242
5243 default:
5244 break;
5245 }
5246
5247 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5248 because such sections are not SEC_ALLOC and thus ld.so will
5249 not process them. */
5250 if (unresolved_reloc
5251 && !((input_section->flags & SEC_DEBUGGING) != 0
5252 && h->def_dynamic)
5253 && _bfd_elf_section_offset (output_bfd, info, input_section,
5254 rel->r_offset) != (bfd_vma) -1)
5255 {
5256 (*_bfd_error_handler)
5257 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5258 input_bfd,
5259 input_section,
5260 (long) rel->r_offset,
5261 howto->name,
5262 h->root.root.string);
5263 return FALSE;
5264 }
5265
5266 do_relocation:
5267 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5268 contents, rel->r_offset,
5269 relocation, rel->r_addend);
5270
5271 check_relocation_error:
5272 if (r != bfd_reloc_ok)
5273 {
5274 const char *name;
5275
5276 if (h != NULL)
5277 name = h->root.root.string;
5278 else
5279 {
5280 name = bfd_elf_string_from_elf_section (input_bfd,
5281 symtab_hdr->sh_link,
5282 sym->st_name);
5283 if (name == NULL)
5284 return FALSE;
5285 if (*name == '\0')
5286 name = bfd_section_name (input_bfd, sec);
5287 }
5288
5289 if (r == bfd_reloc_overflow)
5290 {
5291 if (! ((*info->callbacks->reloc_overflow)
5292 (info, (h ? &h->root : NULL), name, howto->name,
5293 (bfd_vma) 0, input_bfd, input_section,
5294 rel->r_offset)))
5295 return FALSE;
5296 }
5297 else
5298 {
5299 (*_bfd_error_handler)
5300 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5301 input_bfd, input_section,
5302 (long) rel->r_offset, name, (int) r);
5303 return FALSE;
5304 }
5305 }
5306
5307 if (wrel != rel)
5308 *wrel = *rel;
5309 }
5310
5311 if (wrel != rel)
5312 {
5313 Elf_Internal_Shdr *rel_hdr;
5314 size_t deleted = rel - wrel;
5315
5316 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5317 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5318 if (rel_hdr->sh_size == 0)
5319 {
5320 /* It is too late to remove an empty reloc section. Leave
5321 one NONE reloc.
5322 ??? What is wrong with an empty section??? */
5323 rel_hdr->sh_size = rel_hdr->sh_entsize;
5324 deleted -= 1;
5325 }
5326 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5327 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5328 input_section->reloc_count -= deleted;
5329 }
5330
5331 return TRUE;
5332 }
5333
5334 /* Finish up dynamic symbol handling. We set the contents of various
5335 dynamic sections here. */
5336
5337 static bfd_boolean
5338 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
5339 struct bfd_link_info *info,
5340 struct elf_link_hash_entry *h,
5341 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
5342 {
5343 struct elf_x86_64_link_hash_table *htab;
5344 const struct elf_x86_64_backend_data *abed;
5345 bfd_boolean use_plt_bnd;
5346 struct elf_x86_64_link_hash_entry *eh;
5347
5348 htab = elf_x86_64_hash_table (info);
5349 if (htab == NULL)
5350 return FALSE;
5351
5352 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5353 section only if there is .plt section. */
5354 use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL;
5355 abed = (use_plt_bnd
5356 ? &elf_x86_64_bnd_arch_bed
5357 : get_elf_x86_64_backend_data (output_bfd));
5358
5359 eh = (struct elf_x86_64_link_hash_entry *) h;
5360
5361 if (h->plt.offset != (bfd_vma) -1)
5362 {
5363 bfd_vma plt_index;
5364 bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset;
5365 bfd_vma plt_plt_insn_end, plt_got_insn_size;
5366 Elf_Internal_Rela rela;
5367 bfd_byte *loc;
5368 asection *plt, *gotplt, *relplt, *resolved_plt;
5369 const struct elf_backend_data *bed;
5370 bfd_vma plt_got_pcrel_offset;
5371
5372 /* When building a static executable, use .iplt, .igot.plt and
5373 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5374 if (htab->elf.splt != NULL)
5375 {
5376 plt = htab->elf.splt;
5377 gotplt = htab->elf.sgotplt;
5378 relplt = htab->elf.srelplt;
5379 }
5380 else
5381 {
5382 plt = htab->elf.iplt;
5383 gotplt = htab->elf.igotplt;
5384 relplt = htab->elf.irelplt;
5385 }
5386
5387 /* This symbol has an entry in the procedure linkage table. Set
5388 it up. */
5389 if ((h->dynindx == -1
5390 && !((h->forced_local || bfd_link_executable (info))
5391 && h->def_regular
5392 && h->type == STT_GNU_IFUNC))
5393 || plt == NULL
5394 || gotplt == NULL
5395 || relplt == NULL)
5396 abort ();
5397
5398 /* Get the index in the procedure linkage table which
5399 corresponds to this symbol. This is the index of this symbol
5400 in all the symbols for which we are making plt entries. The
5401 first entry in the procedure linkage table is reserved.
5402
5403 Get the offset into the .got table of the entry that
5404 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5405 bytes. The first three are reserved for the dynamic linker.
5406
5407 For static executables, we don't reserve anything. */
5408
5409 if (plt == htab->elf.splt)
5410 {
5411 got_offset = h->plt.offset / abed->plt_entry_size - 1;
5412 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
5413 }
5414 else
5415 {
5416 got_offset = h->plt.offset / abed->plt_entry_size;
5417 got_offset = got_offset * GOT_ENTRY_SIZE;
5418 }
5419
5420 plt_plt_insn_end = abed->plt_plt_insn_end;
5421 plt_plt_offset = abed->plt_plt_offset;
5422 plt_got_insn_size = abed->plt_got_insn_size;
5423 plt_got_offset = abed->plt_got_offset;
5424 if (use_plt_bnd)
5425 {
5426 /* Use the second PLT with BND relocations. */
5427 const bfd_byte *plt_entry, *plt2_entry;
5428
5429 if (eh->has_bnd_reloc)
5430 {
5431 plt_entry = elf_x86_64_bnd_plt_entry;
5432 plt2_entry = elf_x86_64_bnd_plt2_entry;
5433 }
5434 else
5435 {
5436 plt_entry = elf_x86_64_legacy_plt_entry;
5437 plt2_entry = elf_x86_64_legacy_plt2_entry;
5438
5439 /* Subtract 1 since there is no BND prefix. */
5440 plt_plt_insn_end -= 1;
5441 plt_plt_offset -= 1;
5442 plt_got_insn_size -= 1;
5443 plt_got_offset -= 1;
5444 }
5445
5446 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry)
5447 == sizeof (elf_x86_64_legacy_plt_entry));
5448
5449 /* Fill in the entry in the procedure linkage table. */
5450 memcpy (plt->contents + h->plt.offset,
5451 plt_entry, sizeof (elf_x86_64_legacy_plt_entry));
5452 /* Fill in the entry in the second PLT. */
5453 memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset,
5454 plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5455
5456 resolved_plt = htab->plt_bnd;
5457 plt_offset = eh->plt_bnd.offset;
5458 }
5459 else
5460 {
5461 /* Fill in the entry in the procedure linkage table. */
5462 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
5463 abed->plt_entry_size);
5464
5465 resolved_plt = plt;
5466 plt_offset = h->plt.offset;
5467 }
5468
5469 /* Insert the relocation positions of the plt section. */
5470
5471 /* Put offset the PC-relative instruction referring to the GOT entry,
5472 subtracting the size of that instruction. */
5473 plt_got_pcrel_offset = (gotplt->output_section->vma
5474 + gotplt->output_offset
5475 + got_offset
5476 - resolved_plt->output_section->vma
5477 - resolved_plt->output_offset
5478 - plt_offset
5479 - plt_got_insn_size);
5480
5481 /* Check PC-relative offset overflow in PLT entry. */
5482 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5483 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5484 output_bfd, h->root.root.string);
5485
5486 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5487 resolved_plt->contents + plt_offset + plt_got_offset);
5488
5489 /* Fill in the entry in the global offset table, initially this
5490 points to the second part of the PLT entry. */
5491 bfd_put_64 (output_bfd, (plt->output_section->vma
5492 + plt->output_offset
5493 + h->plt.offset + abed->plt_lazy_offset),
5494 gotplt->contents + got_offset);
5495
5496 /* Fill in the entry in the .rela.plt section. */
5497 rela.r_offset = (gotplt->output_section->vma
5498 + gotplt->output_offset
5499 + got_offset);
5500 if (h->dynindx == -1
5501 || ((bfd_link_executable (info)
5502 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5503 && h->def_regular
5504 && h->type == STT_GNU_IFUNC))
5505 {
5506 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5507 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5508 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5509 rela.r_addend = (h->root.u.def.value
5510 + h->root.u.def.section->output_section->vma
5511 + h->root.u.def.section->output_offset);
5512 /* R_X86_64_IRELATIVE comes last. */
5513 plt_index = htab->next_irelative_index--;
5514 }
5515 else
5516 {
5517 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5518 rela.r_addend = 0;
5519 plt_index = htab->next_jump_slot_index++;
5520 }
5521
5522 /* Don't fill PLT entry for static executables. */
5523 if (plt == htab->elf.splt)
5524 {
5525 bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
5526
5527 /* Put relocation index. */
5528 bfd_put_32 (output_bfd, plt_index,
5529 plt->contents + h->plt.offset + abed->plt_reloc_offset);
5530
5531 /* Put offset for jmp .PLT0 and check for overflow. We don't
5532 check relocation index for overflow since branch displacement
5533 will overflow first. */
5534 if (plt0_offset > 0x80000000)
5535 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5536 output_bfd, h->root.root.string);
5537 bfd_put_32 (output_bfd, - plt0_offset,
5538 plt->contents + h->plt.offset + plt_plt_offset);
5539 }
5540
5541 bed = get_elf_backend_data (output_bfd);
5542 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5543 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5544 }
5545 else if (eh->plt_got.offset != (bfd_vma) -1)
5546 {
5547 bfd_vma got_offset, plt_offset, plt_got_offset, plt_got_insn_size;
5548 asection *plt, *got;
5549 bfd_boolean got_after_plt;
5550 int32_t got_pcrel_offset;
5551 const bfd_byte *got_plt_entry;
5552
5553 /* Set the entry in the GOT procedure linkage table. */
5554 plt = htab->plt_got;
5555 got = htab->elf.sgot;
5556 got_offset = h->got.offset;
5557
5558 if (got_offset == (bfd_vma) -1
5559 || h->type == STT_GNU_IFUNC
5560 || plt == NULL
5561 || got == NULL)
5562 abort ();
5563
5564 /* Use the second PLT entry template for the GOT PLT since they
5565 are the identical. */
5566 plt_got_insn_size = elf_x86_64_bnd_arch_bed.plt_got_insn_size;
5567 plt_got_offset = elf_x86_64_bnd_arch_bed.plt_got_offset;
5568 if (eh->has_bnd_reloc)
5569 got_plt_entry = elf_x86_64_bnd_plt2_entry;
5570 else
5571 {
5572 got_plt_entry = elf_x86_64_legacy_plt2_entry;
5573
5574 /* Subtract 1 since there is no BND prefix. */
5575 plt_got_insn_size -= 1;
5576 plt_got_offset -= 1;
5577 }
5578
5579 /* Fill in the entry in the GOT procedure linkage table. */
5580 plt_offset = eh->plt_got.offset;
5581 memcpy (plt->contents + plt_offset,
5582 got_plt_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5583
5584 /* Put offset the PC-relative instruction referring to the GOT
5585 entry, subtracting the size of that instruction. */
5586 got_pcrel_offset = (got->output_section->vma
5587 + got->output_offset
5588 + got_offset
5589 - plt->output_section->vma
5590 - plt->output_offset
5591 - plt_offset
5592 - plt_got_insn_size);
5593
5594 /* Check PC-relative offset overflow in GOT PLT entry. */
5595 got_after_plt = got->output_section->vma > plt->output_section->vma;
5596 if ((got_after_plt && got_pcrel_offset < 0)
5597 || (!got_after_plt && got_pcrel_offset > 0))
5598 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5599 output_bfd, h->root.root.string);
5600
5601 bfd_put_32 (output_bfd, got_pcrel_offset,
5602 plt->contents + plt_offset + plt_got_offset);
5603 }
5604
5605 if (!h->def_regular
5606 && (h->plt.offset != (bfd_vma) -1
5607 || eh->plt_got.offset != (bfd_vma) -1))
5608 {
5609 /* Mark the symbol as undefined, rather than as defined in
5610 the .plt section. Leave the value if there were any
5611 relocations where pointer equality matters (this is a clue
5612 for the dynamic linker, to make function pointer
5613 comparisons work between an application and shared
5614 library), otherwise set it to zero. If a function is only
5615 called from a binary, there is no need to slow down
5616 shared libraries because of that. */
5617 sym->st_shndx = SHN_UNDEF;
5618 if (!h->pointer_equality_needed)
5619 sym->st_value = 0;
5620 }
5621
5622 if (h->got.offset != (bfd_vma) -1
5623 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
5624 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
5625 {
5626 Elf_Internal_Rela rela;
5627
5628 /* This symbol has an entry in the global offset table. Set it
5629 up. */
5630 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5631 abort ();
5632
5633 rela.r_offset = (htab->elf.sgot->output_section->vma
5634 + htab->elf.sgot->output_offset
5635 + (h->got.offset &~ (bfd_vma) 1));
5636
5637 /* If this is a static link, or it is a -Bsymbolic link and the
5638 symbol is defined locally or was forced to be local because
5639 of a version file, we just want to emit a RELATIVE reloc.
5640 The entry in the global offset table will already have been
5641 initialized in the relocate_section function. */
5642 if (h->def_regular
5643 && h->type == STT_GNU_IFUNC)
5644 {
5645 if (bfd_link_pic (info))
5646 {
5647 /* Generate R_X86_64_GLOB_DAT. */
5648 goto do_glob_dat;
5649 }
5650 else
5651 {
5652 asection *plt;
5653
5654 if (!h->pointer_equality_needed)
5655 abort ();
5656
5657 /* For non-shared object, we can't use .got.plt, which
5658 contains the real function addres if we need pointer
5659 equality. We load the GOT entry with the PLT entry. */
5660 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5661 bfd_put_64 (output_bfd, (plt->output_section->vma
5662 + plt->output_offset
5663 + h->plt.offset),
5664 htab->elf.sgot->contents + h->got.offset);
5665 return TRUE;
5666 }
5667 }
5668 else if (bfd_link_pic (info)
5669 && SYMBOL_REFERENCES_LOCAL (info, h))
5670 {
5671 if (!h->def_regular)
5672 return FALSE;
5673 BFD_ASSERT((h->got.offset & 1) != 0);
5674 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5675 rela.r_addend = (h->root.u.def.value
5676 + h->root.u.def.section->output_section->vma
5677 + h->root.u.def.section->output_offset);
5678 }
5679 else
5680 {
5681 BFD_ASSERT((h->got.offset & 1) == 0);
5682 do_glob_dat:
5683 bfd_put_64 (output_bfd, (bfd_vma) 0,
5684 htab->elf.sgot->contents + h->got.offset);
5685 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5686 rela.r_addend = 0;
5687 }
5688
5689 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
5690 }
5691
5692 if (h->needs_copy)
5693 {
5694 Elf_Internal_Rela rela;
5695
5696 /* This symbol needs a copy reloc. Set it up. */
5697
5698 if (h->dynindx == -1
5699 || (h->root.type != bfd_link_hash_defined
5700 && h->root.type != bfd_link_hash_defweak)
5701 || htab->srelbss == NULL)
5702 abort ();
5703
5704 rela.r_offset = (h->root.u.def.value
5705 + h->root.u.def.section->output_section->vma
5706 + h->root.u.def.section->output_offset);
5707 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5708 rela.r_addend = 0;
5709 elf_append_rela (output_bfd, htab->srelbss, &rela);
5710 }
5711
5712 return TRUE;
5713 }
5714
5715 /* Finish up local dynamic symbol handling. We set the contents of
5716 various dynamic sections here. */
5717
5718 static bfd_boolean
5719 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5720 {
5721 struct elf_link_hash_entry *h
5722 = (struct elf_link_hash_entry *) *slot;
5723 struct bfd_link_info *info
5724 = (struct bfd_link_info *) inf;
5725
5726 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5727 info, h, NULL);
5728 }
5729
5730 /* Used to decide how to sort relocs in an optimal manner for the
5731 dynamic linker, before writing them out. */
5732
5733 static enum elf_reloc_type_class
5734 elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
5735 const asection *rel_sec ATTRIBUTE_UNUSED,
5736 const Elf_Internal_Rela *rela)
5737 {
5738 bfd *abfd = info->output_bfd;
5739 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5740 struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
5741
5742 if (htab->elf.dynsym != NULL
5743 && htab->elf.dynsym->contents != NULL)
5744 {
5745 /* Check relocation against STT_GNU_IFUNC symbol if there are
5746 dynamic symbols. */
5747 unsigned long r_symndx = htab->r_sym (rela->r_info);
5748 Elf_Internal_Sym sym;
5749 if (!bed->s->swap_symbol_in (abfd,
5750 (htab->elf.dynsym->contents
5751 + r_symndx * bed->s->sizeof_sym),
5752 0, &sym))
5753 abort ();
5754
5755 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5756 return reloc_class_ifunc;
5757 }
5758
5759 switch ((int) ELF32_R_TYPE (rela->r_info))
5760 {
5761 case R_X86_64_RELATIVE:
5762 case R_X86_64_RELATIVE64:
5763 return reloc_class_relative;
5764 case R_X86_64_JUMP_SLOT:
5765 return reloc_class_plt;
5766 case R_X86_64_COPY:
5767 return reloc_class_copy;
5768 default:
5769 return reloc_class_normal;
5770 }
5771 }
5772
5773 /* Finish up the dynamic sections. */
5774
5775 static bfd_boolean
5776 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5777 struct bfd_link_info *info)
5778 {
5779 struct elf_x86_64_link_hash_table *htab;
5780 bfd *dynobj;
5781 asection *sdyn;
5782 const struct elf_x86_64_backend_data *abed;
5783
5784 htab = elf_x86_64_hash_table (info);
5785 if (htab == NULL)
5786 return FALSE;
5787
5788 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5789 section only if there is .plt section. */
5790 abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL
5791 ? &elf_x86_64_bnd_arch_bed
5792 : get_elf_x86_64_backend_data (output_bfd));
5793
5794 dynobj = htab->elf.dynobj;
5795 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5796
5797 if (htab->elf.dynamic_sections_created)
5798 {
5799 bfd_byte *dyncon, *dynconend;
5800 const struct elf_backend_data *bed;
5801 bfd_size_type sizeof_dyn;
5802
5803 if (sdyn == NULL || htab->elf.sgot == NULL)
5804 abort ();
5805
5806 bed = get_elf_backend_data (dynobj);
5807 sizeof_dyn = bed->s->sizeof_dyn;
5808 dyncon = sdyn->contents;
5809 dynconend = sdyn->contents + sdyn->size;
5810 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5811 {
5812 Elf_Internal_Dyn dyn;
5813 asection *s;
5814
5815 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5816
5817 switch (dyn.d_tag)
5818 {
5819 default:
5820 continue;
5821
5822 case DT_PLTGOT:
5823 s = htab->elf.sgotplt;
5824 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5825 break;
5826
5827 case DT_JMPREL:
5828 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5829 break;
5830
5831 case DT_PLTRELSZ:
5832 s = htab->elf.srelplt->output_section;
5833 dyn.d_un.d_val = s->size;
5834 break;
5835
5836 case DT_RELASZ:
5837 /* The procedure linkage table relocs (DT_JMPREL) should
5838 not be included in the overall relocs (DT_RELA).
5839 Therefore, we override the DT_RELASZ entry here to
5840 make it not include the JMPREL relocs. Since the
5841 linker script arranges for .rela.plt to follow all
5842 other relocation sections, we don't have to worry
5843 about changing the DT_RELA entry. */
5844 if (htab->elf.srelplt != NULL)
5845 {
5846 s = htab->elf.srelplt->output_section;
5847 dyn.d_un.d_val -= s->size;
5848 }
5849 break;
5850
5851 case DT_TLSDESC_PLT:
5852 s = htab->elf.splt;
5853 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5854 + htab->tlsdesc_plt;
5855 break;
5856
5857 case DT_TLSDESC_GOT:
5858 s = htab->elf.sgot;
5859 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5860 + htab->tlsdesc_got;
5861 break;
5862 }
5863
5864 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5865 }
5866
5867 /* Fill in the special first entry in the procedure linkage table. */
5868 if (htab->elf.splt && htab->elf.splt->size > 0)
5869 {
5870 /* Fill in the first entry in the procedure linkage table. */
5871 memcpy (htab->elf.splt->contents,
5872 abed->plt0_entry, abed->plt_entry_size);
5873 /* Add offset for pushq GOT+8(%rip), since the instruction
5874 uses 6 bytes subtract this value. */
5875 bfd_put_32 (output_bfd,
5876 (htab->elf.sgotplt->output_section->vma
5877 + htab->elf.sgotplt->output_offset
5878 + 8
5879 - htab->elf.splt->output_section->vma
5880 - htab->elf.splt->output_offset
5881 - 6),
5882 htab->elf.splt->contents + abed->plt0_got1_offset);
5883 /* Add offset for the PC-relative instruction accessing GOT+16,
5884 subtracting the offset to the end of that instruction. */
5885 bfd_put_32 (output_bfd,
5886 (htab->elf.sgotplt->output_section->vma
5887 + htab->elf.sgotplt->output_offset
5888 + 16
5889 - htab->elf.splt->output_section->vma
5890 - htab->elf.splt->output_offset
5891 - abed->plt0_got2_insn_end),
5892 htab->elf.splt->contents + abed->plt0_got2_offset);
5893
5894 elf_section_data (htab->elf.splt->output_section)
5895 ->this_hdr.sh_entsize = abed->plt_entry_size;
5896
5897 if (htab->tlsdesc_plt)
5898 {
5899 bfd_put_64 (output_bfd, (bfd_vma) 0,
5900 htab->elf.sgot->contents + htab->tlsdesc_got);
5901
5902 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
5903 abed->plt0_entry, abed->plt_entry_size);
5904
5905 /* Add offset for pushq GOT+8(%rip), since the
5906 instruction uses 6 bytes subtract this value. */
5907 bfd_put_32 (output_bfd,
5908 (htab->elf.sgotplt->output_section->vma
5909 + htab->elf.sgotplt->output_offset
5910 + 8
5911 - htab->elf.splt->output_section->vma
5912 - htab->elf.splt->output_offset
5913 - htab->tlsdesc_plt
5914 - 6),
5915 htab->elf.splt->contents
5916 + htab->tlsdesc_plt + abed->plt0_got1_offset);
5917 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5918 where TGD stands for htab->tlsdesc_got, subtracting the offset
5919 to the end of that instruction. */
5920 bfd_put_32 (output_bfd,
5921 (htab->elf.sgot->output_section->vma
5922 + htab->elf.sgot->output_offset
5923 + htab->tlsdesc_got
5924 - htab->elf.splt->output_section->vma
5925 - htab->elf.splt->output_offset
5926 - htab->tlsdesc_plt
5927 - abed->plt0_got2_insn_end),
5928 htab->elf.splt->contents
5929 + htab->tlsdesc_plt + abed->plt0_got2_offset);
5930 }
5931 }
5932 }
5933
5934 if (htab->plt_bnd != NULL)
5935 elf_section_data (htab->plt_bnd->output_section)
5936 ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry);
5937
5938 if (htab->elf.sgotplt)
5939 {
5940 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5941 {
5942 (*_bfd_error_handler)
5943 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5944 return FALSE;
5945 }
5946
5947 /* Fill in the first three entries in the global offset table. */
5948 if (htab->elf.sgotplt->size > 0)
5949 {
5950 /* Set the first entry in the global offset table to the address of
5951 the dynamic section. */
5952 if (sdyn == NULL)
5953 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
5954 else
5955 bfd_put_64 (output_bfd,
5956 sdyn->output_section->vma + sdyn->output_offset,
5957 htab->elf.sgotplt->contents);
5958 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5959 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
5960 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
5961 }
5962
5963 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
5964 GOT_ENTRY_SIZE;
5965 }
5966
5967 /* Adjust .eh_frame for .plt section. */
5968 if (htab->plt_eh_frame != NULL
5969 && htab->plt_eh_frame->contents != NULL)
5970 {
5971 if (htab->elf.splt != NULL
5972 && htab->elf.splt->size != 0
5973 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5974 && htab->elf.splt->output_section != NULL
5975 && htab->plt_eh_frame->output_section != NULL)
5976 {
5977 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5978 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5979 + htab->plt_eh_frame->output_offset
5980 + PLT_FDE_START_OFFSET;
5981 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5982 htab->plt_eh_frame->contents
5983 + PLT_FDE_START_OFFSET);
5984 }
5985 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5986 {
5987 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5988 htab->plt_eh_frame,
5989 htab->plt_eh_frame->contents))
5990 return FALSE;
5991 }
5992 }
5993
5994 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5995 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5996 = GOT_ENTRY_SIZE;
5997
5998 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5999 htab_traverse (htab->loc_hash_table,
6000 elf_x86_64_finish_local_dynamic_symbol,
6001 info);
6002
6003 return TRUE;
6004 }
6005
6006 /* Return an array of PLT entry symbol values. */
6007
6008 static bfd_vma *
6009 elf_x86_64_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
6010 asection *relplt)
6011 {
6012 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
6013 arelent *p;
6014 long count, i;
6015 bfd_vma *plt_sym_val;
6016 bfd_vma plt_offset;
6017 bfd_byte *plt_contents;
6018 const struct elf_x86_64_backend_data *bed;
6019 Elf_Internal_Shdr *hdr;
6020 asection *plt_bnd;
6021
6022 /* Get the .plt section contents. PLT passed down may point to the
6023 .plt.bnd section. Make sure that PLT always points to the .plt
6024 section. */
6025 plt_bnd = bfd_get_section_by_name (abfd, ".plt.bnd");
6026 if (plt_bnd)
6027 {
6028 if (plt != plt_bnd)
6029 abort ();
6030 plt = bfd_get_section_by_name (abfd, ".plt");
6031 if (plt == NULL)
6032 abort ();
6033 bed = &elf_x86_64_bnd_arch_bed;
6034 }
6035 else
6036 bed = get_elf_x86_64_backend_data (abfd);
6037
6038 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
6039 if (plt_contents == NULL)
6040 return NULL;
6041 if (!bfd_get_section_contents (abfd, (asection *) plt,
6042 plt_contents, 0, plt->size))
6043 {
6044 bad_return:
6045 free (plt_contents);
6046 return NULL;
6047 }
6048
6049 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
6050 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
6051 goto bad_return;
6052
6053 hdr = &elf_section_data (relplt)->this_hdr;
6054 count = relplt->size / hdr->sh_entsize;
6055
6056 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
6057 if (plt_sym_val == NULL)
6058 goto bad_return;
6059
6060 for (i = 0; i < count; i++)
6061 plt_sym_val[i] = -1;
6062
6063 plt_offset = bed->plt_entry_size;
6064 p = relplt->relocation;
6065 for (i = 0; i < count; i++, p++)
6066 {
6067 long reloc_index;
6068
6069 /* Skip unknown relocation. */
6070 if (p->howto == NULL)
6071 continue;
6072
6073 if (p->howto->type != R_X86_64_JUMP_SLOT
6074 && p->howto->type != R_X86_64_IRELATIVE)
6075 continue;
6076
6077 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
6078 + bed->plt_reloc_offset));
6079 if (reloc_index < count)
6080 {
6081 if (plt_bnd)
6082 {
6083 /* This is the index in .plt section. */
6084 long plt_index = plt_offset / bed->plt_entry_size;
6085 /* Store VMA + the offset in .plt.bnd section. */
6086 plt_sym_val[reloc_index] =
6087 (plt_bnd->vma
6088 + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
6089 }
6090 else
6091 plt_sym_val[reloc_index] = plt->vma + plt_offset;
6092 }
6093 plt_offset += bed->plt_entry_size;
6094
6095 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6096 section. */
6097 if (plt_offset >= plt->size)
6098 break;
6099 }
6100
6101 free (plt_contents);
6102
6103 return plt_sym_val;
6104 }
6105
6106 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6107 support. */
6108
6109 static long
6110 elf_x86_64_get_synthetic_symtab (bfd *abfd,
6111 long symcount,
6112 asymbol **syms,
6113 long dynsymcount,
6114 asymbol **dynsyms,
6115 asymbol **ret)
6116 {
6117 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6118 as PLT if it exists. */
6119 asection *plt = bfd_get_section_by_name (abfd, ".plt.bnd");
6120 if (plt == NULL)
6121 plt = bfd_get_section_by_name (abfd, ".plt");
6122 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
6123 dynsymcount, dynsyms, ret,
6124 plt,
6125 elf_x86_64_get_plt_sym_val);
6126 }
6127
6128 /* Handle an x86-64 specific section when reading an object file. This
6129 is called when elfcode.h finds a section with an unknown type. */
6130
6131 static bfd_boolean
6132 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
6133 const char *name, int shindex)
6134 {
6135 if (hdr->sh_type != SHT_X86_64_UNWIND)
6136 return FALSE;
6137
6138 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
6139 return FALSE;
6140
6141 return TRUE;
6142 }
6143
6144 /* Hook called by the linker routine which adds symbols from an object
6145 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6146 of .bss. */
6147
6148 static bfd_boolean
6149 elf_x86_64_add_symbol_hook (bfd *abfd,
6150 struct bfd_link_info *info,
6151 Elf_Internal_Sym *sym,
6152 const char **namep ATTRIBUTE_UNUSED,
6153 flagword *flagsp ATTRIBUTE_UNUSED,
6154 asection **secp,
6155 bfd_vma *valp)
6156 {
6157 asection *lcomm;
6158
6159 switch (sym->st_shndx)
6160 {
6161 case SHN_X86_64_LCOMMON:
6162 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
6163 if (lcomm == NULL)
6164 {
6165 lcomm = bfd_make_section_with_flags (abfd,
6166 "LARGE_COMMON",
6167 (SEC_ALLOC
6168 | SEC_IS_COMMON
6169 | SEC_LINKER_CREATED));
6170 if (lcomm == NULL)
6171 return FALSE;
6172 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
6173 }
6174 *secp = lcomm;
6175 *valp = sym->st_size;
6176 return TRUE;
6177 }
6178
6179 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
6180 && (abfd->flags & DYNAMIC) == 0
6181 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
6182 elf_tdata (info->output_bfd)->has_gnu_symbols
6183 |= elf_gnu_symbol_unique;
6184
6185 return TRUE;
6186 }
6187
6188
6189 /* Given a BFD section, try to locate the corresponding ELF section
6190 index. */
6191
6192 static bfd_boolean
6193 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
6194 asection *sec, int *index_return)
6195 {
6196 if (sec == &_bfd_elf_large_com_section)
6197 {
6198 *index_return = SHN_X86_64_LCOMMON;
6199 return TRUE;
6200 }
6201 return FALSE;
6202 }
6203
6204 /* Process a symbol. */
6205
6206 static void
6207 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
6208 asymbol *asym)
6209 {
6210 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
6211
6212 switch (elfsym->internal_elf_sym.st_shndx)
6213 {
6214 case SHN_X86_64_LCOMMON:
6215 asym->section = &_bfd_elf_large_com_section;
6216 asym->value = elfsym->internal_elf_sym.st_size;
6217 /* Common symbol doesn't set BSF_GLOBAL. */
6218 asym->flags &= ~BSF_GLOBAL;
6219 break;
6220 }
6221 }
6222
6223 static bfd_boolean
6224 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
6225 {
6226 return (sym->st_shndx == SHN_COMMON
6227 || sym->st_shndx == SHN_X86_64_LCOMMON);
6228 }
6229
6230 static unsigned int
6231 elf_x86_64_common_section_index (asection *sec)
6232 {
6233 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6234 return SHN_COMMON;
6235 else
6236 return SHN_X86_64_LCOMMON;
6237 }
6238
6239 static asection *
6240 elf_x86_64_common_section (asection *sec)
6241 {
6242 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6243 return bfd_com_section_ptr;
6244 else
6245 return &_bfd_elf_large_com_section;
6246 }
6247
6248 static bfd_boolean
6249 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
6250 const Elf_Internal_Sym *sym,
6251 asection **psec,
6252 bfd_boolean newdef,
6253 bfd_boolean olddef,
6254 bfd *oldbfd,
6255 const asection *oldsec)
6256 {
6257 /* A normal common symbol and a large common symbol result in a
6258 normal common symbol. We turn the large common symbol into a
6259 normal one. */
6260 if (!olddef
6261 && h->root.type == bfd_link_hash_common
6262 && !newdef
6263 && bfd_is_com_section (*psec)
6264 && oldsec != *psec)
6265 {
6266 if (sym->st_shndx == SHN_COMMON
6267 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
6268 {
6269 h->root.u.c.p->section
6270 = bfd_make_section_old_way (oldbfd, "COMMON");
6271 h->root.u.c.p->section->flags = SEC_ALLOC;
6272 }
6273 else if (sym->st_shndx == SHN_X86_64_LCOMMON
6274 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
6275 *psec = bfd_com_section_ptr;
6276 }
6277
6278 return TRUE;
6279 }
6280
6281 static int
6282 elf_x86_64_additional_program_headers (bfd *abfd,
6283 struct bfd_link_info *info ATTRIBUTE_UNUSED)
6284 {
6285 asection *s;
6286 int count = 0;
6287
6288 /* Check to see if we need a large readonly segment. */
6289 s = bfd_get_section_by_name (abfd, ".lrodata");
6290 if (s && (s->flags & SEC_LOAD))
6291 count++;
6292
6293 /* Check to see if we need a large data segment. Since .lbss sections
6294 is placed right after the .bss section, there should be no need for
6295 a large data segment just because of .lbss. */
6296 s = bfd_get_section_by_name (abfd, ".ldata");
6297 if (s && (s->flags & SEC_LOAD))
6298 count++;
6299
6300 return count;
6301 }
6302
6303 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6304
6305 static bfd_boolean
6306 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
6307 {
6308 if (h->plt.offset != (bfd_vma) -1
6309 && !h->def_regular
6310 && !h->pointer_equality_needed)
6311 return FALSE;
6312
6313 return _bfd_elf_hash_symbol (h);
6314 }
6315
6316 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6317
6318 static bfd_boolean
6319 elf_x86_64_relocs_compatible (const bfd_target *input,
6320 const bfd_target *output)
6321 {
6322 return ((xvec_get_elf_backend_data (input)->s->elfclass
6323 == xvec_get_elf_backend_data (output)->s->elfclass)
6324 && _bfd_elf_relocs_compatible (input, output));
6325 }
6326
6327 static const struct bfd_elf_special_section
6328 elf_x86_64_special_sections[]=
6329 {
6330 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6331 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6332 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
6333 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6334 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6335 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6336 { NULL, 0, 0, 0, 0 }
6337 };
6338
6339 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6340 #define TARGET_LITTLE_NAME "elf64-x86-64"
6341 #define ELF_ARCH bfd_arch_i386
6342 #define ELF_TARGET_ID X86_64_ELF_DATA
6343 #define ELF_MACHINE_CODE EM_X86_64
6344 #define ELF_MAXPAGESIZE 0x200000
6345 #define ELF_MINPAGESIZE 0x1000
6346 #define ELF_COMMONPAGESIZE 0x1000
6347
6348 #define elf_backend_can_gc_sections 1
6349 #define elf_backend_can_refcount 1
6350 #define elf_backend_want_got_plt 1
6351 #define elf_backend_plt_readonly 1
6352 #define elf_backend_want_plt_sym 0
6353 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6354 #define elf_backend_rela_normal 1
6355 #define elf_backend_plt_alignment 4
6356 #define elf_backend_extern_protected_data 1
6357
6358 #define elf_info_to_howto elf_x86_64_info_to_howto
6359
6360 #define bfd_elf64_bfd_link_hash_table_create \
6361 elf_x86_64_link_hash_table_create
6362 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6363 #define bfd_elf64_bfd_reloc_name_lookup \
6364 elf_x86_64_reloc_name_lookup
6365
6366 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6367 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6368 #define elf_backend_check_relocs elf_x86_64_check_relocs
6369 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6370 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6371 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6372 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6373 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6374 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6375 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6376 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6377 #ifdef CORE_HEADER
6378 #define elf_backend_write_core_note elf_x86_64_write_core_note
6379 #endif
6380 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6381 #define elf_backend_relocate_section elf_x86_64_relocate_section
6382 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6383 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6384 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6385 #define elf_backend_object_p elf64_x86_64_elf_object_p
6386 #define bfd_elf64_mkobject elf_x86_64_mkobject
6387 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6388
6389 #define elf_backend_section_from_shdr \
6390 elf_x86_64_section_from_shdr
6391
6392 #define elf_backend_section_from_bfd_section \
6393 elf_x86_64_elf_section_from_bfd_section
6394 #define elf_backend_add_symbol_hook \
6395 elf_x86_64_add_symbol_hook
6396 #define elf_backend_symbol_processing \
6397 elf_x86_64_symbol_processing
6398 #define elf_backend_common_section_index \
6399 elf_x86_64_common_section_index
6400 #define elf_backend_common_section \
6401 elf_x86_64_common_section
6402 #define elf_backend_common_definition \
6403 elf_x86_64_common_definition
6404 #define elf_backend_merge_symbol \
6405 elf_x86_64_merge_symbol
6406 #define elf_backend_special_sections \
6407 elf_x86_64_special_sections
6408 #define elf_backend_additional_program_headers \
6409 elf_x86_64_additional_program_headers
6410 #define elf_backend_hash_symbol \
6411 elf_x86_64_hash_symbol
6412 #define elf_backend_omit_section_dynsym \
6413 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
6414
6415 #include "elf64-target.h"
6416
6417 /* CloudABI support. */
6418
6419 #undef TARGET_LITTLE_SYM
6420 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6421 #undef TARGET_LITTLE_NAME
6422 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6423
6424 #undef ELF_OSABI
6425 #define ELF_OSABI ELFOSABI_CLOUDABI
6426
6427 #undef elf64_bed
6428 #define elf64_bed elf64_x86_64_cloudabi_bed
6429
6430 #include "elf64-target.h"
6431
6432 /* FreeBSD support. */
6433
6434 #undef TARGET_LITTLE_SYM
6435 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6436 #undef TARGET_LITTLE_NAME
6437 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6438
6439 #undef ELF_OSABI
6440 #define ELF_OSABI ELFOSABI_FREEBSD
6441
6442 #undef elf64_bed
6443 #define elf64_bed elf64_x86_64_fbsd_bed
6444
6445 #include "elf64-target.h"
6446
6447 /* Solaris 2 support. */
6448
6449 #undef TARGET_LITTLE_SYM
6450 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6451 #undef TARGET_LITTLE_NAME
6452 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6453
6454 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6455 objects won't be recognized. */
6456 #undef ELF_OSABI
6457
6458 #undef elf64_bed
6459 #define elf64_bed elf64_x86_64_sol2_bed
6460
6461 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6462 boundary. */
6463 #undef elf_backend_static_tls_alignment
6464 #define elf_backend_static_tls_alignment 16
6465
6466 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6467
6468 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6469 File, p.63. */
6470 #undef elf_backend_want_plt_sym
6471 #define elf_backend_want_plt_sym 1
6472
6473 #include "elf64-target.h"
6474
6475 /* Native Client support. */
6476
6477 static bfd_boolean
6478 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
6479 {
6480 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6481 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
6482 return TRUE;
6483 }
6484
6485 #undef TARGET_LITTLE_SYM
6486 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6487 #undef TARGET_LITTLE_NAME
6488 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6489 #undef elf64_bed
6490 #define elf64_bed elf64_x86_64_nacl_bed
6491
6492 #undef ELF_MAXPAGESIZE
6493 #undef ELF_MINPAGESIZE
6494 #undef ELF_COMMONPAGESIZE
6495 #define ELF_MAXPAGESIZE 0x10000
6496 #define ELF_MINPAGESIZE 0x10000
6497 #define ELF_COMMONPAGESIZE 0x10000
6498
6499 /* Restore defaults. */
6500 #undef ELF_OSABI
6501 #undef elf_backend_static_tls_alignment
6502 #undef elf_backend_want_plt_sym
6503 #define elf_backend_want_plt_sym 0
6504
6505 /* NaCl uses substantially different PLT entries for the same effects. */
6506
6507 #undef elf_backend_plt_alignment
6508 #define elf_backend_plt_alignment 5
6509 #define NACL_PLT_ENTRY_SIZE 64
6510 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6511
6512 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
6513 {
6514 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6515 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6516 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6517 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6518 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6519
6520 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6521 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6522
6523 /* 32 bytes of nop to pad out to the standard size. */
6524 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6525 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6526 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6527 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6528 0x66, /* excess data32 prefix */
6529 0x90 /* nop */
6530 };
6531
6532 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6533 {
6534 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6535 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6536 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6537 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6538
6539 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6540 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6541 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6542
6543 /* Lazy GOT entries point here (32-byte aligned). */
6544 0x68, /* pushq immediate */
6545 0, 0, 0, 0, /* replaced with index into relocation table. */
6546 0xe9, /* jmp relative */
6547 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6548
6549 /* 22 bytes of nop to pad out to the standard size. */
6550 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6551 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6552 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6553 };
6554
6555 /* .eh_frame covering the .plt section. */
6556
6557 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
6558 {
6559 #if (PLT_CIE_LENGTH != 20 \
6560 || PLT_FDE_LENGTH != 36 \
6561 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6562 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6563 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6564 #endif
6565 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6566 0, 0, 0, 0, /* CIE ID */
6567 1, /* CIE version */
6568 'z', 'R', 0, /* Augmentation string */
6569 1, /* Code alignment factor */
6570 0x78, /* Data alignment factor */
6571 16, /* Return address column */
6572 1, /* Augmentation size */
6573 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6574 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6575 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6576 DW_CFA_nop, DW_CFA_nop,
6577
6578 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6579 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
6580 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6581 0, 0, 0, 0, /* .plt size goes here */
6582 0, /* Augmentation size */
6583 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
6584 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6585 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
6586 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6587 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6588 13, /* Block length */
6589 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
6590 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
6591 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6592 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
6593 DW_CFA_nop, DW_CFA_nop
6594 };
6595
6596 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
6597 {
6598 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
6599 elf_x86_64_nacl_plt_entry, /* plt_entry */
6600 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6601 2, /* plt0_got1_offset */
6602 9, /* plt0_got2_offset */
6603 13, /* plt0_got2_insn_end */
6604 3, /* plt_got_offset */
6605 33, /* plt_reloc_offset */
6606 38, /* plt_plt_offset */
6607 7, /* plt_got_insn_size */
6608 42, /* plt_plt_insn_end */
6609 32, /* plt_lazy_offset */
6610 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
6611 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
6612 };
6613
6614 #undef elf_backend_arch_data
6615 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6616
6617 #undef elf_backend_object_p
6618 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6619 #undef elf_backend_modify_segment_map
6620 #define elf_backend_modify_segment_map nacl_modify_segment_map
6621 #undef elf_backend_modify_program_headers
6622 #define elf_backend_modify_program_headers nacl_modify_program_headers
6623 #undef elf_backend_final_write_processing
6624 #define elf_backend_final_write_processing nacl_final_write_processing
6625
6626 #include "elf64-target.h"
6627
6628 /* Native Client x32 support. */
6629
6630 static bfd_boolean
6631 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
6632 {
6633 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6634 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
6635 return TRUE;
6636 }
6637
6638 #undef TARGET_LITTLE_SYM
6639 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6640 #undef TARGET_LITTLE_NAME
6641 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6642 #undef elf32_bed
6643 #define elf32_bed elf32_x86_64_nacl_bed
6644
6645 #define bfd_elf32_bfd_link_hash_table_create \
6646 elf_x86_64_link_hash_table_create
6647 #define bfd_elf32_bfd_reloc_type_lookup \
6648 elf_x86_64_reloc_type_lookup
6649 #define bfd_elf32_bfd_reloc_name_lookup \
6650 elf_x86_64_reloc_name_lookup
6651 #define bfd_elf32_mkobject \
6652 elf_x86_64_mkobject
6653 #define bfd_elf32_get_synthetic_symtab \
6654 elf_x86_64_get_synthetic_symtab
6655
6656 #undef elf_backend_object_p
6657 #define elf_backend_object_p \
6658 elf32_x86_64_nacl_elf_object_p
6659
6660 #undef elf_backend_bfd_from_remote_memory
6661 #define elf_backend_bfd_from_remote_memory \
6662 _bfd_elf32_bfd_from_remote_memory
6663
6664 #undef elf_backend_size_info
6665 #define elf_backend_size_info \
6666 _bfd_elf32_size_info
6667
6668 #include "elf32-target.h"
6669
6670 /* Restore defaults. */
6671 #undef elf_backend_object_p
6672 #define elf_backend_object_p elf64_x86_64_elf_object_p
6673 #undef elf_backend_bfd_from_remote_memory
6674 #undef elf_backend_size_info
6675 #undef elf_backend_modify_segment_map
6676 #undef elf_backend_modify_program_headers
6677 #undef elf_backend_final_write_processing
6678
6679 /* Intel L1OM support. */
6680
6681 static bfd_boolean
6682 elf64_l1om_elf_object_p (bfd *abfd)
6683 {
6684 /* Set the right machine number for an L1OM elf64 file. */
6685 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
6686 return TRUE;
6687 }
6688
6689 #undef TARGET_LITTLE_SYM
6690 #define TARGET_LITTLE_SYM l1om_elf64_vec
6691 #undef TARGET_LITTLE_NAME
6692 #define TARGET_LITTLE_NAME "elf64-l1om"
6693 #undef ELF_ARCH
6694 #define ELF_ARCH bfd_arch_l1om
6695
6696 #undef ELF_MACHINE_CODE
6697 #define ELF_MACHINE_CODE EM_L1OM
6698
6699 #undef ELF_OSABI
6700
6701 #undef elf64_bed
6702 #define elf64_bed elf64_l1om_bed
6703
6704 #undef elf_backend_object_p
6705 #define elf_backend_object_p elf64_l1om_elf_object_p
6706
6707 /* Restore defaults. */
6708 #undef ELF_MAXPAGESIZE
6709 #undef ELF_MINPAGESIZE
6710 #undef ELF_COMMONPAGESIZE
6711 #define ELF_MAXPAGESIZE 0x200000
6712 #define ELF_MINPAGESIZE 0x1000
6713 #define ELF_COMMONPAGESIZE 0x1000
6714 #undef elf_backend_plt_alignment
6715 #define elf_backend_plt_alignment 4
6716 #undef elf_backend_arch_data
6717 #define elf_backend_arch_data &elf_x86_64_arch_bed
6718
6719 #include "elf64-target.h"
6720
6721 /* FreeBSD L1OM support. */
6722
6723 #undef TARGET_LITTLE_SYM
6724 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6725 #undef TARGET_LITTLE_NAME
6726 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6727
6728 #undef ELF_OSABI
6729 #define ELF_OSABI ELFOSABI_FREEBSD
6730
6731 #undef elf64_bed
6732 #define elf64_bed elf64_l1om_fbsd_bed
6733
6734 #include "elf64-target.h"
6735
6736 /* Intel K1OM support. */
6737
6738 static bfd_boolean
6739 elf64_k1om_elf_object_p (bfd *abfd)
6740 {
6741 /* Set the right machine number for an K1OM elf64 file. */
6742 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
6743 return TRUE;
6744 }
6745
6746 #undef TARGET_LITTLE_SYM
6747 #define TARGET_LITTLE_SYM k1om_elf64_vec
6748 #undef TARGET_LITTLE_NAME
6749 #define TARGET_LITTLE_NAME "elf64-k1om"
6750 #undef ELF_ARCH
6751 #define ELF_ARCH bfd_arch_k1om
6752
6753 #undef ELF_MACHINE_CODE
6754 #define ELF_MACHINE_CODE EM_K1OM
6755
6756 #undef ELF_OSABI
6757
6758 #undef elf64_bed
6759 #define elf64_bed elf64_k1om_bed
6760
6761 #undef elf_backend_object_p
6762 #define elf_backend_object_p elf64_k1om_elf_object_p
6763
6764 #undef elf_backend_static_tls_alignment
6765
6766 #undef elf_backend_want_plt_sym
6767 #define elf_backend_want_plt_sym 0
6768
6769 #include "elf64-target.h"
6770
6771 /* FreeBSD K1OM support. */
6772
6773 #undef TARGET_LITTLE_SYM
6774 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6775 #undef TARGET_LITTLE_NAME
6776 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6777
6778 #undef ELF_OSABI
6779 #define ELF_OSABI ELFOSABI_FREEBSD
6780
6781 #undef elf64_bed
6782 #define elf64_bed elf64_k1om_fbsd_bed
6783
6784 #include "elf64-target.h"
6785
6786 /* 32bit x86-64 support. */
6787
6788 #undef TARGET_LITTLE_SYM
6789 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6790 #undef TARGET_LITTLE_NAME
6791 #define TARGET_LITTLE_NAME "elf32-x86-64"
6792 #undef elf32_bed
6793
6794 #undef ELF_ARCH
6795 #define ELF_ARCH bfd_arch_i386
6796
6797 #undef ELF_MACHINE_CODE
6798 #define ELF_MACHINE_CODE EM_X86_64
6799
6800 #undef ELF_OSABI
6801
6802 #undef elf_backend_object_p
6803 #define elf_backend_object_p \
6804 elf32_x86_64_elf_object_p
6805
6806 #undef elf_backend_bfd_from_remote_memory
6807 #define elf_backend_bfd_from_remote_memory \
6808 _bfd_elf32_bfd_from_remote_memory
6809
6810 #undef elf_backend_size_info
6811 #define elf_backend_size_info \
6812 _bfd_elf32_size_info
6813
6814 #include "elf32-target.h"