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[binutils-gdb.git] / bfd / elf64-x86-64.c
1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2015 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 h->plt.offset = (bfd_vma) -1;
2727 h->needs_plt = 0;
2728 }
2729 }
2730 else
2731 {
2732 h->plt.offset = (bfd_vma) -1;
2733 h->needs_plt = 0;
2734 }
2735
2736 eh->tlsdesc_got = (bfd_vma) -1;
2737
2738 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2739 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2740 if (h->got.refcount > 0
2741 && bfd_link_executable (info)
2742 && h->dynindx == -1
2743 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2744 {
2745 h->got.offset = (bfd_vma) -1;
2746 }
2747 else if (h->got.refcount > 0)
2748 {
2749 asection *s;
2750 bfd_boolean dyn;
2751 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2752
2753 /* Make sure this symbol is output as a dynamic symbol.
2754 Undefined weak syms won't yet be marked as dynamic. */
2755 if (h->dynindx == -1
2756 && !h->forced_local)
2757 {
2758 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2759 return FALSE;
2760 }
2761
2762 if (GOT_TLS_GDESC_P (tls_type))
2763 {
2764 eh->tlsdesc_got = htab->elf.sgotplt->size
2765 - elf_x86_64_compute_jump_table_size (htab);
2766 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2767 h->got.offset = (bfd_vma) -2;
2768 }
2769 if (! GOT_TLS_GDESC_P (tls_type)
2770 || GOT_TLS_GD_P (tls_type))
2771 {
2772 s = htab->elf.sgot;
2773 h->got.offset = s->size;
2774 s->size += GOT_ENTRY_SIZE;
2775 if (GOT_TLS_GD_P (tls_type))
2776 s->size += GOT_ENTRY_SIZE;
2777 }
2778 dyn = htab->elf.dynamic_sections_created;
2779 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2780 and two if global.
2781 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2782 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2783 || tls_type == GOT_TLS_IE)
2784 htab->elf.srelgot->size += bed->s->sizeof_rela;
2785 else if (GOT_TLS_GD_P (tls_type))
2786 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2787 else if (! GOT_TLS_GDESC_P (tls_type)
2788 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2789 || h->root.type != bfd_link_hash_undefweak)
2790 && (bfd_link_pic (info)
2791 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2792 htab->elf.srelgot->size += bed->s->sizeof_rela;
2793 if (GOT_TLS_GDESC_P (tls_type))
2794 {
2795 htab->elf.srelplt->size += bed->s->sizeof_rela;
2796 htab->tlsdesc_plt = (bfd_vma) -1;
2797 }
2798 }
2799 else
2800 h->got.offset = (bfd_vma) -1;
2801
2802 if (eh->dyn_relocs == NULL)
2803 return TRUE;
2804
2805 /* In the shared -Bsymbolic case, discard space allocated for
2806 dynamic pc-relative relocs against symbols which turn out to be
2807 defined in regular objects. For the normal shared case, discard
2808 space for pc-relative relocs that have become local due to symbol
2809 visibility changes. */
2810
2811 if (bfd_link_pic (info))
2812 {
2813 /* Relocs that use pc_count are those that appear on a call
2814 insn, or certain REL relocs that can generated via assembly.
2815 We want calls to protected symbols to resolve directly to the
2816 function rather than going via the plt. If people want
2817 function pointer comparisons to work as expected then they
2818 should avoid writing weird assembly. */
2819 if (SYMBOL_CALLS_LOCAL (info, h))
2820 {
2821 struct elf_dyn_relocs **pp;
2822
2823 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2824 {
2825 p->count -= p->pc_count;
2826 p->pc_count = 0;
2827 if (p->count == 0)
2828 *pp = p->next;
2829 else
2830 pp = &p->next;
2831 }
2832 }
2833
2834 /* Also discard relocs on undefined weak syms with non-default
2835 visibility. */
2836 if (eh->dyn_relocs != NULL)
2837 {
2838 if (h->root.type == bfd_link_hash_undefweak)
2839 {
2840 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2841 eh->dyn_relocs = NULL;
2842
2843 /* Make sure undefined weak symbols are output as a dynamic
2844 symbol in PIEs. */
2845 else if (h->dynindx == -1
2846 && ! h->forced_local
2847 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2848 return FALSE;
2849 }
2850 /* For PIE, discard space for pc-relative relocs against
2851 symbols which turn out to need copy relocs. */
2852 else if (bfd_link_executable (info)
2853 && (h->needs_copy || eh->needs_copy)
2854 && h->def_dynamic
2855 && !h->def_regular)
2856 {
2857 struct elf_dyn_relocs **pp;
2858
2859 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2860 {
2861 if (p->pc_count != 0)
2862 *pp = p->next;
2863 else
2864 pp = &p->next;
2865 }
2866 }
2867 }
2868 }
2869 else if (ELIMINATE_COPY_RELOCS)
2870 {
2871 /* For the non-shared case, discard space for relocs against
2872 symbols which turn out to need copy relocs or are not
2873 dynamic. Keep dynamic relocations for run-time function
2874 pointer initialization. */
2875
2876 if ((!h->non_got_ref || eh->func_pointer_refcount > 0)
2877 && ((h->def_dynamic
2878 && !h->def_regular)
2879 || (htab->elf.dynamic_sections_created
2880 && (h->root.type == bfd_link_hash_undefweak
2881 || h->root.type == bfd_link_hash_undefined))))
2882 {
2883 /* Make sure this symbol is output as a dynamic symbol.
2884 Undefined weak syms won't yet be marked as dynamic. */
2885 if (h->dynindx == -1
2886 && ! h->forced_local
2887 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2888 return FALSE;
2889
2890 /* If that succeeded, we know we'll be keeping all the
2891 relocs. */
2892 if (h->dynindx != -1)
2893 goto keep;
2894 }
2895
2896 eh->dyn_relocs = NULL;
2897 eh->func_pointer_refcount = 0;
2898
2899 keep: ;
2900 }
2901
2902 /* Finally, allocate space. */
2903 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2904 {
2905 asection * sreloc;
2906
2907 sreloc = elf_section_data (p->sec)->sreloc;
2908
2909 BFD_ASSERT (sreloc != NULL);
2910
2911 sreloc->size += p->count * bed->s->sizeof_rela;
2912 }
2913
2914 return TRUE;
2915 }
2916
2917 /* Allocate space in .plt, .got and associated reloc sections for
2918 local dynamic relocs. */
2919
2920 static bfd_boolean
2921 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2922 {
2923 struct elf_link_hash_entry *h
2924 = (struct elf_link_hash_entry *) *slot;
2925
2926 if (h->type != STT_GNU_IFUNC
2927 || !h->def_regular
2928 || !h->ref_regular
2929 || !h->forced_local
2930 || h->root.type != bfd_link_hash_defined)
2931 abort ();
2932
2933 return elf_x86_64_allocate_dynrelocs (h, inf);
2934 }
2935
2936 /* Find any dynamic relocs that apply to read-only sections. */
2937
2938 static bfd_boolean
2939 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2940 void * inf)
2941 {
2942 struct elf_x86_64_link_hash_entry *eh;
2943 struct elf_dyn_relocs *p;
2944
2945 /* Skip local IFUNC symbols. */
2946 if (h->forced_local && h->type == STT_GNU_IFUNC)
2947 return TRUE;
2948
2949 eh = (struct elf_x86_64_link_hash_entry *) h;
2950 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2951 {
2952 asection *s = p->sec->output_section;
2953
2954 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2955 {
2956 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2957
2958 info->flags |= DF_TEXTREL;
2959
2960 if ((info->warn_shared_textrel && bfd_link_pic (info))
2961 || info->error_textrel)
2962 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2963 p->sec->owner, h->root.root.string,
2964 p->sec);
2965
2966 /* Not an error, just cut short the traversal. */
2967 return FALSE;
2968 }
2969 }
2970 return TRUE;
2971 }
2972
2973 /* With the local symbol, foo, we convert
2974 mov foo@GOTPCREL(%rip), %reg
2975 to
2976 lea foo(%rip), %reg
2977 and convert
2978 call/jmp *foo@GOTPCREL(%rip)
2979 to
2980 nop call foo/jmp foo nop
2981 When PIC is false, convert
2982 test %reg, foo@GOTPCREL(%rip)
2983 to
2984 test $foo, %reg
2985 and convert
2986 binop foo@GOTPCREL(%rip), %reg
2987 to
2988 binop $foo, %reg
2989 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2990 instructions. */
2991
2992 static bfd_boolean
2993 elf_x86_64_convert_load (bfd *abfd, asection *sec,
2994 struct bfd_link_info *link_info)
2995 {
2996 Elf_Internal_Shdr *symtab_hdr;
2997 Elf_Internal_Rela *internal_relocs;
2998 Elf_Internal_Rela *irel, *irelend;
2999 bfd_byte *contents;
3000 struct elf_x86_64_link_hash_table *htab;
3001 bfd_boolean changed_contents;
3002 bfd_boolean changed_relocs;
3003 bfd_signed_vma *local_got_refcounts;
3004 bfd_vma maxpagesize;
3005
3006 /* Don't even try to convert non-ELF outputs. */
3007 if (!is_elf_hash_table (link_info->hash))
3008 return FALSE;
3009
3010 /* Nothing to do if there is no need or no output. */
3011 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3012 || sec->need_convert_load == 0
3013 || bfd_is_abs_section (sec->output_section))
3014 return TRUE;
3015
3016 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3017
3018 /* Load the relocations for this section. */
3019 internal_relocs = (_bfd_elf_link_read_relocs
3020 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3021 link_info->keep_memory));
3022 if (internal_relocs == NULL)
3023 return FALSE;
3024
3025 htab = elf_x86_64_hash_table (link_info);
3026 changed_contents = FALSE;
3027 changed_relocs = FALSE;
3028 local_got_refcounts = elf_local_got_refcounts (abfd);
3029 maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
3030
3031 /* Get the section contents. */
3032 if (elf_section_data (sec)->this_hdr.contents != NULL)
3033 contents = elf_section_data (sec)->this_hdr.contents;
3034 else
3035 {
3036 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3037 goto error_return;
3038 }
3039
3040 irelend = internal_relocs + sec->reloc_count;
3041 for (irel = internal_relocs; irel < irelend; irel++)
3042 {
3043 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3044 unsigned int r_symndx = htab->r_sym (irel->r_info);
3045 unsigned int indx;
3046 struct elf_link_hash_entry *h;
3047 asection *tsec;
3048 char symtype;
3049 bfd_vma toff, roff;
3050 bfd_signed_vma raddend;
3051 unsigned int opcode;
3052 unsigned int modrm;
3053
3054 if (r_type != R_X86_64_GOTPCREL
3055 && r_type != R_X86_64_GOTPCRELX
3056 && r_type != R_X86_64_REX_GOTPCRELX)
3057 continue;
3058
3059 roff = irel->r_offset;
3060 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
3061 continue;
3062
3063 raddend = irel->r_addend;
3064 /* Addend for 32-bit PC-relative relocation must be -4. */
3065 if (raddend != -4)
3066 continue;
3067
3068 opcode = bfd_get_8 (abfd, contents + roff - 2);
3069
3070 /* It is OK to convert mov to lea. */
3071 if (opcode != 0x8b)
3072 {
3073 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
3074 for mov call, jmp or one of adc, add, and, cmp, or, sbb,
3075 sub, test, xor instructions. */
3076 if (r_type != R_X86_64_GOTPCRELX
3077 && r_type != R_X86_64_REX_GOTPCRELX)
3078 continue;
3079
3080 /* It is OK to convert indirect branch to direct branch. */
3081 if (opcode != 0xff)
3082 {
3083 /* It is OK to convert adc, add, and, cmp, or, sbb, sub,
3084 test, xor only when PIC is false. */
3085 if (bfd_link_pic (link_info))
3086 continue;
3087 }
3088 }
3089
3090 /* Get the symbol referred to by the reloc. */
3091 if (r_symndx < symtab_hdr->sh_info)
3092 {
3093 Elf_Internal_Sym *isym;
3094
3095 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
3096 abfd, r_symndx);
3097
3098 symtype = ELF_ST_TYPE (isym->st_info);
3099
3100 /* STT_GNU_IFUNC must keep GOTPCREL relocations and skip
3101 relocation against undefined symbols. */
3102 if (symtype == STT_GNU_IFUNC || isym->st_shndx == SHN_UNDEF)
3103 continue;
3104
3105 if (isym->st_shndx == SHN_ABS)
3106 tsec = bfd_abs_section_ptr;
3107 else if (isym->st_shndx == SHN_COMMON)
3108 tsec = bfd_com_section_ptr;
3109 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
3110 tsec = &_bfd_elf_large_com_section;
3111 else
3112 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3113
3114 h = NULL;
3115 toff = isym->st_value;
3116 }
3117 else
3118 {
3119 indx = r_symndx - symtab_hdr->sh_info;
3120 h = elf_sym_hashes (abfd)[indx];
3121 BFD_ASSERT (h != NULL);
3122
3123 while (h->root.type == bfd_link_hash_indirect
3124 || h->root.type == bfd_link_hash_warning)
3125 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3126
3127 /* STT_GNU_IFUNC must keep GOTPCREL relocations. We also
3128 avoid optimizing GOTPCREL relocations againt _DYNAMIC
3129 since ld.so may use its link-time address. */
3130 if ((h->root.type == bfd_link_hash_defined
3131 || h->root.type == bfd_link_hash_defweak
3132 || h->root.type == bfd_link_hash_new)
3133 && h->type != STT_GNU_IFUNC
3134 && h != htab->elf.hdynamic
3135 && SYMBOL_REFERENCES_LOCAL (link_info, h))
3136 {
3137 /* bfd_link_hash_new is set by an assignment in a linker
3138 script in bfd_elf_record_link_assignment. FIXME: If
3139 we ever get a linker error due relocation overflow, we
3140 will skip this optimization. */
3141 if (h->root.type == bfd_link_hash_new)
3142 goto convert;
3143 tsec = h->root.u.def.section;
3144 toff = h->root.u.def.value;
3145 symtype = h->type;
3146 }
3147 else
3148 continue;
3149 }
3150
3151 if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
3152 {
3153 /* At this stage in linking, no SEC_MERGE symbol has been
3154 adjusted, so all references to such symbols need to be
3155 passed through _bfd_merged_section_offset. (Later, in
3156 relocate_section, all SEC_MERGE symbols *except* for
3157 section symbols have been adjusted.)
3158
3159 gas may reduce relocations against symbols in SEC_MERGE
3160 sections to a relocation against the section symbol when
3161 the original addend was zero. When the reloc is against
3162 a section symbol we should include the addend in the
3163 offset passed to _bfd_merged_section_offset, since the
3164 location of interest is the original symbol. On the
3165 other hand, an access to "sym+addend" where "sym" is not
3166 a section symbol should not include the addend; Such an
3167 access is presumed to be an offset from "sym"; The
3168 location of interest is just "sym". */
3169 if (symtype == STT_SECTION)
3170 toff += raddend;
3171
3172 toff = _bfd_merged_section_offset (abfd, &tsec,
3173 elf_section_data (tsec)->sec_info,
3174 toff);
3175
3176 if (symtype != STT_SECTION)
3177 toff += raddend;
3178 }
3179 else
3180 toff += raddend;
3181
3182 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3183 if (tsec->output_section == sec->output_section)
3184 {
3185 if ((toff - roff + 0x80000000) > 0xffffffff)
3186 continue;
3187 }
3188 else
3189 {
3190 asection *asect;
3191 bfd_size_type size;
3192
3193 /* At this point, we don't know the load addresses of TSEC
3194 section nor SEC section. We estimate the distrance between
3195 SEC and TSEC. */
3196 size = 0;
3197 for (asect = sec->output_section;
3198 asect != NULL && asect != tsec->output_section;
3199 asect = asect->next)
3200 {
3201 asection *i;
3202 for (i = asect->output_section->map_head.s;
3203 i != NULL;
3204 i = i->map_head.s)
3205 {
3206 size = align_power (size, i->alignment_power);
3207 size += i->size;
3208 }
3209 }
3210
3211 /* Don't convert GOTPCREL relocations if TSEC isn't placed
3212 after SEC. */
3213 if (asect == NULL)
3214 continue;
3215
3216 /* Take PT_GNU_RELRO segment into account by adding
3217 maxpagesize. */
3218 if ((toff + size + maxpagesize - roff + 0x80000000)
3219 > 0xffffffff)
3220 continue;
3221 }
3222
3223 convert:
3224 if (opcode == 0xff)
3225 {
3226 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
3227 unsigned int nop;
3228 unsigned int disp;
3229 bfd_vma nop_offset;
3230
3231 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
3232 R_X86_64_PC32. */
3233 modrm = bfd_get_8 (abfd, contents + roff - 1);
3234 if (modrm == 0x25)
3235 {
3236 /* Convert to "jmp foo nop". */
3237 modrm = 0xe9;
3238 nop = NOP_OPCODE;
3239 nop_offset = irel->r_offset + 3;
3240 disp = bfd_get_32 (abfd, contents + irel->r_offset);
3241 irel->r_offset -= 1;
3242 bfd_put_32 (abfd, disp, contents + irel->r_offset);
3243 }
3244 else
3245 {
3246 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
3247 is a nop prefix. */
3248 modrm = 0xe8;
3249 nop = link_info->call_nop_byte;
3250 if (link_info->call_nop_as_suffix)
3251 {
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 nop_offset = irel->r_offset - 2;
3259 }
3260 bfd_put_8 (abfd, nop, contents + nop_offset);
3261 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
3262 r_type = R_X86_64_PC32;
3263 }
3264 else
3265 {
3266 if (opcode == 0x8b)
3267 {
3268 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
3269 "lea foo(%rip), %reg". */
3270 opcode = 0x8d;
3271 r_type = R_X86_64_PC32;
3272 }
3273 else
3274 {
3275 modrm = bfd_get_8 (abfd, contents + roff - 1);
3276 if (opcode == 0x85)
3277 {
3278 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
3279 "test $foo, %reg". */
3280 modrm = 0xc0 | (modrm & 0x38) >> 3;
3281 opcode = 0xf7;
3282 }
3283 else
3284 {
3285 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
3286 "binop $foo, %reg". */
3287 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
3288 opcode = 0x81;
3289 }
3290 bfd_put_8 (abfd, modrm, contents + roff - 1);
3291
3292 if (r_type == R_X86_64_REX_GOTPCRELX)
3293 {
3294 /* Move the R bit to the B bit in REX byte. */
3295 unsigned int rex = bfd_get_8 (abfd, contents + roff - 3);
3296 rex = (rex & ~REX_R) | (rex & REX_R) >> 2;
3297 bfd_put_8 (abfd, rex, contents + roff - 3);
3298 }
3299 /* No addend for R_X86_64_32S relocation. */
3300 irel->r_addend = 0;
3301 r_type = R_X86_64_32S;
3302 }
3303
3304 bfd_put_8 (abfd, opcode, contents + roff - 2);
3305 }
3306
3307 irel->r_info = htab->r_info (r_symndx, r_type);
3308 changed_contents = TRUE;
3309 changed_relocs = TRUE;
3310
3311 if (h)
3312 {
3313 if (h->got.refcount > 0)
3314 h->got.refcount -= 1;
3315 }
3316 else
3317 {
3318 if (local_got_refcounts != NULL
3319 && local_got_refcounts[r_symndx] > 0)
3320 local_got_refcounts[r_symndx] -= 1;
3321 }
3322 }
3323
3324 if (contents != NULL
3325 && elf_section_data (sec)->this_hdr.contents != contents)
3326 {
3327 if (!changed_contents && !link_info->keep_memory)
3328 free (contents);
3329 else
3330 {
3331 /* Cache the section contents for elf_link_input_bfd. */
3332 elf_section_data (sec)->this_hdr.contents = contents;
3333 }
3334 }
3335
3336 if (elf_section_data (sec)->relocs != internal_relocs)
3337 {
3338 if (!changed_relocs)
3339 free (internal_relocs);
3340 else
3341 elf_section_data (sec)->relocs = internal_relocs;
3342 }
3343
3344 return TRUE;
3345
3346 error_return:
3347 if (contents != NULL
3348 && elf_section_data (sec)->this_hdr.contents != contents)
3349 free (contents);
3350 if (internal_relocs != NULL
3351 && elf_section_data (sec)->relocs != internal_relocs)
3352 free (internal_relocs);
3353 return FALSE;
3354 }
3355
3356 /* Set the sizes of the dynamic sections. */
3357
3358 static bfd_boolean
3359 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3360 struct bfd_link_info *info)
3361 {
3362 struct elf_x86_64_link_hash_table *htab;
3363 bfd *dynobj;
3364 asection *s;
3365 bfd_boolean relocs;
3366 bfd *ibfd;
3367 const struct elf_backend_data *bed;
3368
3369 htab = elf_x86_64_hash_table (info);
3370 if (htab == NULL)
3371 return FALSE;
3372 bed = get_elf_backend_data (output_bfd);
3373
3374 dynobj = htab->elf.dynobj;
3375 if (dynobj == NULL)
3376 abort ();
3377
3378 if (htab->elf.dynamic_sections_created)
3379 {
3380 /* Set the contents of the .interp section to the interpreter. */
3381 if (bfd_link_executable (info) && !info->nointerp)
3382 {
3383 s = bfd_get_linker_section (dynobj, ".interp");
3384 if (s == NULL)
3385 abort ();
3386 s->size = htab->dynamic_interpreter_size;
3387 s->contents = (unsigned char *) htab->dynamic_interpreter;
3388 }
3389 }
3390
3391 /* Set up .got offsets for local syms, and space for local dynamic
3392 relocs. */
3393 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3394 {
3395 bfd_signed_vma *local_got;
3396 bfd_signed_vma *end_local_got;
3397 char *local_tls_type;
3398 bfd_vma *local_tlsdesc_gotent;
3399 bfd_size_type locsymcount;
3400 Elf_Internal_Shdr *symtab_hdr;
3401 asection *srel;
3402
3403 if (! is_x86_64_elf (ibfd))
3404 continue;
3405
3406 for (s = ibfd->sections; s != NULL; s = s->next)
3407 {
3408 struct elf_dyn_relocs *p;
3409
3410 if (!elf_x86_64_convert_load (ibfd, s, info))
3411 return FALSE;
3412
3413 for (p = (struct elf_dyn_relocs *)
3414 (elf_section_data (s)->local_dynrel);
3415 p != NULL;
3416 p = p->next)
3417 {
3418 if (!bfd_is_abs_section (p->sec)
3419 && bfd_is_abs_section (p->sec->output_section))
3420 {
3421 /* Input section has been discarded, either because
3422 it is a copy of a linkonce section or due to
3423 linker script /DISCARD/, so we'll be discarding
3424 the relocs too. */
3425 }
3426 else if (p->count != 0)
3427 {
3428 srel = elf_section_data (p->sec)->sreloc;
3429 srel->size += p->count * bed->s->sizeof_rela;
3430 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3431 && (info->flags & DF_TEXTREL) == 0)
3432 {
3433 info->flags |= DF_TEXTREL;
3434 if ((info->warn_shared_textrel && bfd_link_pic (info))
3435 || info->error_textrel)
3436 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3437 p->sec->owner, p->sec);
3438 }
3439 }
3440 }
3441 }
3442
3443 local_got = elf_local_got_refcounts (ibfd);
3444 if (!local_got)
3445 continue;
3446
3447 symtab_hdr = &elf_symtab_hdr (ibfd);
3448 locsymcount = symtab_hdr->sh_info;
3449 end_local_got = local_got + locsymcount;
3450 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3451 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3452 s = htab->elf.sgot;
3453 srel = htab->elf.srelgot;
3454 for (; local_got < end_local_got;
3455 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3456 {
3457 *local_tlsdesc_gotent = (bfd_vma) -1;
3458 if (*local_got > 0)
3459 {
3460 if (GOT_TLS_GDESC_P (*local_tls_type))
3461 {
3462 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3463 - elf_x86_64_compute_jump_table_size (htab);
3464 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3465 *local_got = (bfd_vma) -2;
3466 }
3467 if (! GOT_TLS_GDESC_P (*local_tls_type)
3468 || GOT_TLS_GD_P (*local_tls_type))
3469 {
3470 *local_got = s->size;
3471 s->size += GOT_ENTRY_SIZE;
3472 if (GOT_TLS_GD_P (*local_tls_type))
3473 s->size += GOT_ENTRY_SIZE;
3474 }
3475 if (bfd_link_pic (info)
3476 || GOT_TLS_GD_ANY_P (*local_tls_type)
3477 || *local_tls_type == GOT_TLS_IE)
3478 {
3479 if (GOT_TLS_GDESC_P (*local_tls_type))
3480 {
3481 htab->elf.srelplt->size
3482 += bed->s->sizeof_rela;
3483 htab->tlsdesc_plt = (bfd_vma) -1;
3484 }
3485 if (! GOT_TLS_GDESC_P (*local_tls_type)
3486 || GOT_TLS_GD_P (*local_tls_type))
3487 srel->size += bed->s->sizeof_rela;
3488 }
3489 }
3490 else
3491 *local_got = (bfd_vma) -1;
3492 }
3493 }
3494
3495 if (htab->tls_ld_got.refcount > 0)
3496 {
3497 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3498 relocs. */
3499 htab->tls_ld_got.offset = htab->elf.sgot->size;
3500 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3501 htab->elf.srelgot->size += bed->s->sizeof_rela;
3502 }
3503 else
3504 htab->tls_ld_got.offset = -1;
3505
3506 /* Allocate global sym .plt and .got entries, and space for global
3507 sym dynamic relocs. */
3508 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3509 info);
3510
3511 /* Allocate .plt and .got entries, and space for local symbols. */
3512 htab_traverse (htab->loc_hash_table,
3513 elf_x86_64_allocate_local_dynrelocs,
3514 info);
3515
3516 /* For every jump slot reserved in the sgotplt, reloc_count is
3517 incremented. However, when we reserve space for TLS descriptors,
3518 it's not incremented, so in order to compute the space reserved
3519 for them, it suffices to multiply the reloc count by the jump
3520 slot size.
3521
3522 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3523 so that R_X86_64_IRELATIVE entries come last. */
3524 if (htab->elf.srelplt)
3525 {
3526 htab->sgotplt_jump_table_size
3527 = elf_x86_64_compute_jump_table_size (htab);
3528 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3529 }
3530 else if (htab->elf.irelplt)
3531 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3532
3533 if (htab->tlsdesc_plt)
3534 {
3535 /* If we're not using lazy TLS relocations, don't generate the
3536 PLT and GOT entries they require. */
3537 if ((info->flags & DF_BIND_NOW))
3538 htab->tlsdesc_plt = 0;
3539 else
3540 {
3541 htab->tlsdesc_got = htab->elf.sgot->size;
3542 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3543 /* Reserve room for the initial entry.
3544 FIXME: we could probably do away with it in this case. */
3545 if (htab->elf.splt->size == 0)
3546 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3547 htab->tlsdesc_plt = htab->elf.splt->size;
3548 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3549 }
3550 }
3551
3552 if (htab->elf.sgotplt)
3553 {
3554 /* Don't allocate .got.plt section if there are no GOT nor PLT
3555 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3556 if ((htab->elf.hgot == NULL
3557 || !htab->elf.hgot->ref_regular_nonweak)
3558 && (htab->elf.sgotplt->size
3559 == get_elf_backend_data (output_bfd)->got_header_size)
3560 && (htab->elf.splt == NULL
3561 || htab->elf.splt->size == 0)
3562 && (htab->elf.sgot == NULL
3563 || htab->elf.sgot->size == 0)
3564 && (htab->elf.iplt == NULL
3565 || htab->elf.iplt->size == 0)
3566 && (htab->elf.igotplt == NULL
3567 || htab->elf.igotplt->size == 0))
3568 htab->elf.sgotplt->size = 0;
3569 }
3570
3571 if (htab->plt_eh_frame != NULL
3572 && htab->elf.splt != NULL
3573 && htab->elf.splt->size != 0
3574 && !bfd_is_abs_section (htab->elf.splt->output_section)
3575 && _bfd_elf_eh_frame_present (info))
3576 {
3577 const struct elf_x86_64_backend_data *arch_data
3578 = get_elf_x86_64_arch_data (bed);
3579 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
3580 }
3581
3582 /* We now have determined the sizes of the various dynamic sections.
3583 Allocate memory for them. */
3584 relocs = FALSE;
3585 for (s = dynobj->sections; s != NULL; s = s->next)
3586 {
3587 if ((s->flags & SEC_LINKER_CREATED) == 0)
3588 continue;
3589
3590 if (s == htab->elf.splt
3591 || s == htab->elf.sgot
3592 || s == htab->elf.sgotplt
3593 || s == htab->elf.iplt
3594 || s == htab->elf.igotplt
3595 || s == htab->plt_bnd
3596 || s == htab->plt_got
3597 || s == htab->plt_eh_frame
3598 || s == htab->sdynbss)
3599 {
3600 /* Strip this section if we don't need it; see the
3601 comment below. */
3602 }
3603 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3604 {
3605 if (s->size != 0 && s != htab->elf.srelplt)
3606 relocs = TRUE;
3607
3608 /* We use the reloc_count field as a counter if we need
3609 to copy relocs into the output file. */
3610 if (s != htab->elf.srelplt)
3611 s->reloc_count = 0;
3612 }
3613 else
3614 {
3615 /* It's not one of our sections, so don't allocate space. */
3616 continue;
3617 }
3618
3619 if (s->size == 0)
3620 {
3621 /* If we don't need this section, strip it from the
3622 output file. This is mostly to handle .rela.bss and
3623 .rela.plt. We must create both sections in
3624 create_dynamic_sections, because they must be created
3625 before the linker maps input sections to output
3626 sections. The linker does that before
3627 adjust_dynamic_symbol is called, and it is that
3628 function which decides whether anything needs to go
3629 into these sections. */
3630
3631 s->flags |= SEC_EXCLUDE;
3632 continue;
3633 }
3634
3635 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3636 continue;
3637
3638 /* Allocate memory for the section contents. We use bfd_zalloc
3639 here in case unused entries are not reclaimed before the
3640 section's contents are written out. This should not happen,
3641 but this way if it does, we get a R_X86_64_NONE reloc instead
3642 of garbage. */
3643 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3644 if (s->contents == NULL)
3645 return FALSE;
3646 }
3647
3648 if (htab->plt_eh_frame != NULL
3649 && htab->plt_eh_frame->contents != NULL)
3650 {
3651 const struct elf_x86_64_backend_data *arch_data
3652 = get_elf_x86_64_arch_data (bed);
3653
3654 memcpy (htab->plt_eh_frame->contents,
3655 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3656 bfd_put_32 (dynobj, htab->elf.splt->size,
3657 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3658 }
3659
3660 if (htab->elf.dynamic_sections_created)
3661 {
3662 /* Add some entries to the .dynamic section. We fill in the
3663 values later, in elf_x86_64_finish_dynamic_sections, but we
3664 must add the entries now so that we get the correct size for
3665 the .dynamic section. The DT_DEBUG entry is filled in by the
3666 dynamic linker and used by the debugger. */
3667 #define add_dynamic_entry(TAG, VAL) \
3668 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3669
3670 if (bfd_link_executable (info))
3671 {
3672 if (!add_dynamic_entry (DT_DEBUG, 0))
3673 return FALSE;
3674 }
3675
3676 if (htab->elf.splt->size != 0)
3677 {
3678 /* DT_PLTGOT is used by prelink even if there is no PLT
3679 relocation. */
3680 if (!add_dynamic_entry (DT_PLTGOT, 0))
3681 return FALSE;
3682
3683 if (htab->elf.srelplt->size != 0)
3684 {
3685 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3686 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3687 || !add_dynamic_entry (DT_JMPREL, 0))
3688 return FALSE;
3689 }
3690
3691 if (htab->tlsdesc_plt
3692 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3693 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3694 return FALSE;
3695 }
3696
3697 if (relocs)
3698 {
3699 if (!add_dynamic_entry (DT_RELA, 0)
3700 || !add_dynamic_entry (DT_RELASZ, 0)
3701 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3702 return FALSE;
3703
3704 /* If any dynamic relocs apply to a read-only section,
3705 then we need a DT_TEXTREL entry. */
3706 if ((info->flags & DF_TEXTREL) == 0)
3707 elf_link_hash_traverse (&htab->elf,
3708 elf_x86_64_readonly_dynrelocs,
3709 info);
3710
3711 if ((info->flags & DF_TEXTREL) != 0)
3712 {
3713 if ((elf_tdata (output_bfd)->has_gnu_symbols
3714 & elf_gnu_symbol_ifunc) == elf_gnu_symbol_ifunc)
3715 {
3716 info->callbacks->einfo
3717 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3718 bfd_set_error (bfd_error_bad_value);
3719 return FALSE;
3720 }
3721
3722 if (!add_dynamic_entry (DT_TEXTREL, 0))
3723 return FALSE;
3724 }
3725 }
3726 }
3727 #undef add_dynamic_entry
3728
3729 return TRUE;
3730 }
3731
3732 static bfd_boolean
3733 elf_x86_64_always_size_sections (bfd *output_bfd,
3734 struct bfd_link_info *info)
3735 {
3736 asection *tls_sec = elf_hash_table (info)->tls_sec;
3737
3738 if (tls_sec)
3739 {
3740 struct elf_link_hash_entry *tlsbase;
3741
3742 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3743 "_TLS_MODULE_BASE_",
3744 FALSE, FALSE, FALSE);
3745
3746 if (tlsbase && tlsbase->type == STT_TLS)
3747 {
3748 struct elf_x86_64_link_hash_table *htab;
3749 struct bfd_link_hash_entry *bh = NULL;
3750 const struct elf_backend_data *bed
3751 = get_elf_backend_data (output_bfd);
3752
3753 htab = elf_x86_64_hash_table (info);
3754 if (htab == NULL)
3755 return FALSE;
3756
3757 if (!(_bfd_generic_link_add_one_symbol
3758 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3759 tls_sec, 0, NULL, FALSE,
3760 bed->collect, &bh)))
3761 return FALSE;
3762
3763 htab->tls_module_base = bh;
3764
3765 tlsbase = (struct elf_link_hash_entry *)bh;
3766 tlsbase->def_regular = 1;
3767 tlsbase->other = STV_HIDDEN;
3768 tlsbase->root.linker_def = 1;
3769 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3770 }
3771 }
3772
3773 return TRUE;
3774 }
3775
3776 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3777 executables. Rather than setting it to the beginning of the TLS
3778 section, we have to set it to the end. This function may be called
3779 multiple times, it is idempotent. */
3780
3781 static void
3782 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3783 {
3784 struct elf_x86_64_link_hash_table *htab;
3785 struct bfd_link_hash_entry *base;
3786
3787 if (!bfd_link_executable (info))
3788 return;
3789
3790 htab = elf_x86_64_hash_table (info);
3791 if (htab == NULL)
3792 return;
3793
3794 base = htab->tls_module_base;
3795 if (base == NULL)
3796 return;
3797
3798 base->u.def.value = htab->elf.tls_size;
3799 }
3800
3801 /* Return the base VMA address which should be subtracted from real addresses
3802 when resolving @dtpoff relocation.
3803 This is PT_TLS segment p_vaddr. */
3804
3805 static bfd_vma
3806 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3807 {
3808 /* If tls_sec is NULL, we should have signalled an error already. */
3809 if (elf_hash_table (info)->tls_sec == NULL)
3810 return 0;
3811 return elf_hash_table (info)->tls_sec->vma;
3812 }
3813
3814 /* Return the relocation value for @tpoff relocation
3815 if STT_TLS virtual address is ADDRESS. */
3816
3817 static bfd_vma
3818 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3819 {
3820 struct elf_link_hash_table *htab = elf_hash_table (info);
3821 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3822 bfd_vma static_tls_size;
3823
3824 /* If tls_segment is NULL, we should have signalled an error already. */
3825 if (htab->tls_sec == NULL)
3826 return 0;
3827
3828 /* Consider special static TLS alignment requirements. */
3829 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3830 return address - static_tls_size - htab->tls_sec->vma;
3831 }
3832
3833 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3834 branch? */
3835
3836 static bfd_boolean
3837 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3838 {
3839 /* Opcode Instruction
3840 0xe8 call
3841 0xe9 jump
3842 0x0f 0x8x conditional jump */
3843 return ((offset > 0
3844 && (contents [offset - 1] == 0xe8
3845 || contents [offset - 1] == 0xe9))
3846 || (offset > 1
3847 && contents [offset - 2] == 0x0f
3848 && (contents [offset - 1] & 0xf0) == 0x80));
3849 }
3850
3851 /* Relocate an x86_64 ELF section. */
3852
3853 static bfd_boolean
3854 elf_x86_64_relocate_section (bfd *output_bfd,
3855 struct bfd_link_info *info,
3856 bfd *input_bfd,
3857 asection *input_section,
3858 bfd_byte *contents,
3859 Elf_Internal_Rela *relocs,
3860 Elf_Internal_Sym *local_syms,
3861 asection **local_sections)
3862 {
3863 struct elf_x86_64_link_hash_table *htab;
3864 Elf_Internal_Shdr *symtab_hdr;
3865 struct elf_link_hash_entry **sym_hashes;
3866 bfd_vma *local_got_offsets;
3867 bfd_vma *local_tlsdesc_gotents;
3868 Elf_Internal_Rela *rel;
3869 Elf_Internal_Rela *relend;
3870 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3871
3872 BFD_ASSERT (is_x86_64_elf (input_bfd));
3873
3874 htab = elf_x86_64_hash_table (info);
3875 if (htab == NULL)
3876 return FALSE;
3877 symtab_hdr = &elf_symtab_hdr (input_bfd);
3878 sym_hashes = elf_sym_hashes (input_bfd);
3879 local_got_offsets = elf_local_got_offsets (input_bfd);
3880 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3881
3882 elf_x86_64_set_tls_module_base (info);
3883
3884 rel = relocs;
3885 relend = relocs + input_section->reloc_count;
3886 for (; rel < relend; rel++)
3887 {
3888 unsigned int r_type;
3889 reloc_howto_type *howto;
3890 unsigned long r_symndx;
3891 struct elf_link_hash_entry *h;
3892 struct elf_x86_64_link_hash_entry *eh;
3893 Elf_Internal_Sym *sym;
3894 asection *sec;
3895 bfd_vma off, offplt, plt_offset;
3896 bfd_vma relocation;
3897 bfd_boolean unresolved_reloc;
3898 bfd_reloc_status_type r;
3899 int tls_type;
3900 asection *base_got, *resolved_plt;
3901 bfd_vma st_size;
3902
3903 r_type = ELF32_R_TYPE (rel->r_info);
3904 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3905 || r_type == (int) R_X86_64_GNU_VTENTRY)
3906 continue;
3907
3908 if (r_type >= (int) R_X86_64_standard)
3909 {
3910 (*_bfd_error_handler)
3911 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3912 input_bfd, input_section, r_type);
3913 bfd_set_error (bfd_error_bad_value);
3914 return FALSE;
3915 }
3916
3917 if (r_type != (int) R_X86_64_32
3918 || ABI_64_P (output_bfd))
3919 howto = x86_64_elf_howto_table + r_type;
3920 else
3921 howto = (x86_64_elf_howto_table
3922 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3923 r_symndx = htab->r_sym (rel->r_info);
3924 h = NULL;
3925 sym = NULL;
3926 sec = NULL;
3927 unresolved_reloc = FALSE;
3928 if (r_symndx < symtab_hdr->sh_info)
3929 {
3930 sym = local_syms + r_symndx;
3931 sec = local_sections[r_symndx];
3932
3933 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3934 &sec, rel);
3935 st_size = sym->st_size;
3936
3937 /* Relocate against local STT_GNU_IFUNC symbol. */
3938 if (!bfd_link_relocatable (info)
3939 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3940 {
3941 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
3942 rel, FALSE);
3943 if (h == NULL)
3944 abort ();
3945
3946 /* Set STT_GNU_IFUNC symbol value. */
3947 h->root.u.def.value = sym->st_value;
3948 h->root.u.def.section = sec;
3949 }
3950 }
3951 else
3952 {
3953 bfd_boolean warned ATTRIBUTE_UNUSED;
3954 bfd_boolean ignored ATTRIBUTE_UNUSED;
3955
3956 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3957 r_symndx, symtab_hdr, sym_hashes,
3958 h, sec, relocation,
3959 unresolved_reloc, warned, ignored);
3960 st_size = h->size;
3961 }
3962
3963 if (sec != NULL && discarded_section (sec))
3964 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3965 rel, 1, relend, howto, 0, contents);
3966
3967 if (bfd_link_relocatable (info))
3968 continue;
3969
3970 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3971 {
3972 if (r_type == R_X86_64_64)
3973 {
3974 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3975 zero-extend it to 64bit if addend is zero. */
3976 r_type = R_X86_64_32;
3977 memset (contents + rel->r_offset + 4, 0, 4);
3978 }
3979 else if (r_type == R_X86_64_SIZE64)
3980 {
3981 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3982 zero-extend it to 64bit if addend is zero. */
3983 r_type = R_X86_64_SIZE32;
3984 memset (contents + rel->r_offset + 4, 0, 4);
3985 }
3986 }
3987
3988 eh = (struct elf_x86_64_link_hash_entry *) h;
3989
3990 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3991 it here if it is defined in a non-shared object. */
3992 if (h != NULL
3993 && h->type == STT_GNU_IFUNC
3994 && h->def_regular)
3995 {
3996 bfd_vma plt_index;
3997 const char *name;
3998
3999 if ((input_section->flags & SEC_ALLOC) == 0)
4000 {
4001 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4002 sections because such sections are not SEC_ALLOC and
4003 thus ld.so will not process them. */
4004 if ((input_section->flags & SEC_DEBUGGING) != 0)
4005 continue;
4006 abort ();
4007 }
4008 else if (h->plt.offset == (bfd_vma) -1)
4009 abort ();
4010
4011 /* STT_GNU_IFUNC symbol must go through PLT. */
4012 if (htab->elf.splt != NULL)
4013 {
4014 if (htab->plt_bnd != NULL)
4015 {
4016 resolved_plt = htab->plt_bnd;
4017 plt_offset = eh->plt_bnd.offset;
4018 }
4019 else
4020 {
4021 resolved_plt = htab->elf.splt;
4022 plt_offset = h->plt.offset;
4023 }
4024 }
4025 else
4026 {
4027 resolved_plt = htab->elf.iplt;
4028 plt_offset = h->plt.offset;
4029 }
4030
4031 relocation = (resolved_plt->output_section->vma
4032 + resolved_plt->output_offset + plt_offset);
4033
4034 switch (r_type)
4035 {
4036 default:
4037 if (h->root.root.string)
4038 name = h->root.root.string;
4039 else
4040 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4041 NULL);
4042 (*_bfd_error_handler)
4043 (_("%B: relocation %s against STT_GNU_IFUNC "
4044 "symbol `%s' isn't handled by %s"), input_bfd,
4045 x86_64_elf_howto_table[r_type].name,
4046 name, __FUNCTION__);
4047 bfd_set_error (bfd_error_bad_value);
4048 return FALSE;
4049
4050 case R_X86_64_32S:
4051 if (bfd_link_pic (info))
4052 abort ();
4053 goto do_relocation;
4054
4055 case R_X86_64_32:
4056 if (ABI_64_P (output_bfd))
4057 goto do_relocation;
4058 /* FALLTHROUGH */
4059 case R_X86_64_64:
4060 if (rel->r_addend != 0)
4061 {
4062 if (h->root.root.string)
4063 name = h->root.root.string;
4064 else
4065 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4066 sym, NULL);
4067 (*_bfd_error_handler)
4068 (_("%B: relocation %s against STT_GNU_IFUNC "
4069 "symbol `%s' has non-zero addend: %d"),
4070 input_bfd, x86_64_elf_howto_table[r_type].name,
4071 name, rel->r_addend);
4072 bfd_set_error (bfd_error_bad_value);
4073 return FALSE;
4074 }
4075
4076 /* Generate dynamic relcoation only when there is a
4077 non-GOT reference in a shared object. */
4078 if (bfd_link_pic (info) && h->non_got_ref)
4079 {
4080 Elf_Internal_Rela outrel;
4081 asection *sreloc;
4082
4083 /* Need a dynamic relocation to get the real function
4084 address. */
4085 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
4086 info,
4087 input_section,
4088 rel->r_offset);
4089 if (outrel.r_offset == (bfd_vma) -1
4090 || outrel.r_offset == (bfd_vma) -2)
4091 abort ();
4092
4093 outrel.r_offset += (input_section->output_section->vma
4094 + input_section->output_offset);
4095
4096 if (h->dynindx == -1
4097 || h->forced_local
4098 || bfd_link_executable (info))
4099 {
4100 /* This symbol is resolved locally. */
4101 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4102 outrel.r_addend = (h->root.u.def.value
4103 + h->root.u.def.section->output_section->vma
4104 + h->root.u.def.section->output_offset);
4105 }
4106 else
4107 {
4108 outrel.r_info = htab->r_info (h->dynindx, r_type);
4109 outrel.r_addend = 0;
4110 }
4111
4112 sreloc = htab->elf.irelifunc;
4113 elf_append_rela (output_bfd, sreloc, &outrel);
4114
4115 /* If this reloc is against an external symbol, we
4116 do not want to fiddle with the addend. Otherwise,
4117 we need to include the symbol value so that it
4118 becomes an addend for the dynamic reloc. For an
4119 internal symbol, we have updated addend. */
4120 continue;
4121 }
4122 /* FALLTHROUGH */
4123 case R_X86_64_PC32:
4124 case R_X86_64_PC32_BND:
4125 case R_X86_64_PC64:
4126 case R_X86_64_PLT32:
4127 case R_X86_64_PLT32_BND:
4128 goto do_relocation;
4129
4130 case R_X86_64_GOTPCREL:
4131 case R_X86_64_GOTPCRELX:
4132 case R_X86_64_REX_GOTPCRELX:
4133 case R_X86_64_GOTPCREL64:
4134 base_got = htab->elf.sgot;
4135 off = h->got.offset;
4136
4137 if (base_got == NULL)
4138 abort ();
4139
4140 if (off == (bfd_vma) -1)
4141 {
4142 /* We can't use h->got.offset here to save state, or
4143 even just remember the offset, as finish_dynamic_symbol
4144 would use that as offset into .got. */
4145
4146 if (htab->elf.splt != NULL)
4147 {
4148 plt_index = h->plt.offset / plt_entry_size - 1;
4149 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4150 base_got = htab->elf.sgotplt;
4151 }
4152 else
4153 {
4154 plt_index = h->plt.offset / plt_entry_size;
4155 off = plt_index * GOT_ENTRY_SIZE;
4156 base_got = htab->elf.igotplt;
4157 }
4158
4159 if (h->dynindx == -1
4160 || h->forced_local
4161 || info->symbolic)
4162 {
4163 /* This references the local defitionion. We must
4164 initialize this entry in the global offset table.
4165 Since the offset must always be a multiple of 8,
4166 we use the least significant bit to record
4167 whether we have initialized it already.
4168
4169 When doing a dynamic link, we create a .rela.got
4170 relocation entry to initialize the value. This
4171 is done in the finish_dynamic_symbol routine. */
4172 if ((off & 1) != 0)
4173 off &= ~1;
4174 else
4175 {
4176 bfd_put_64 (output_bfd, relocation,
4177 base_got->contents + off);
4178 /* Note that this is harmless for the GOTPLT64
4179 case, as -1 | 1 still is -1. */
4180 h->got.offset |= 1;
4181 }
4182 }
4183 }
4184
4185 relocation = (base_got->output_section->vma
4186 + base_got->output_offset + off);
4187
4188 goto do_relocation;
4189 }
4190 }
4191
4192 /* When generating a shared object, the relocations handled here are
4193 copied into the output file to be resolved at run time. */
4194 switch (r_type)
4195 {
4196 case R_X86_64_GOT32:
4197 case R_X86_64_GOT64:
4198 /* Relocation is to the entry for this symbol in the global
4199 offset table. */
4200 case R_X86_64_GOTPCREL:
4201 case R_X86_64_GOTPCRELX:
4202 case R_X86_64_REX_GOTPCRELX:
4203 case R_X86_64_GOTPCREL64:
4204 /* Use global offset table entry as symbol value. */
4205 case R_X86_64_GOTPLT64:
4206 /* This is obsolete and treated the the same as GOT64. */
4207 base_got = htab->elf.sgot;
4208
4209 if (htab->elf.sgot == NULL)
4210 abort ();
4211
4212 if (h != NULL)
4213 {
4214 bfd_boolean dyn;
4215
4216 off = h->got.offset;
4217 if (h->needs_plt
4218 && h->plt.offset != (bfd_vma)-1
4219 && off == (bfd_vma)-1)
4220 {
4221 /* We can't use h->got.offset here to save
4222 state, or even just remember the offset, as
4223 finish_dynamic_symbol would use that as offset into
4224 .got. */
4225 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
4226 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4227 base_got = htab->elf.sgotplt;
4228 }
4229
4230 dyn = htab->elf.dynamic_sections_created;
4231
4232 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
4233 || (bfd_link_pic (info)
4234 && SYMBOL_REFERENCES_LOCAL (info, h))
4235 || (ELF_ST_VISIBILITY (h->other)
4236 && h->root.type == bfd_link_hash_undefweak))
4237 {
4238 /* This is actually a static link, or it is a -Bsymbolic
4239 link and the symbol is defined locally, or the symbol
4240 was forced to be local because of a version file. We
4241 must initialize this entry in the global offset table.
4242 Since the offset must always be a multiple of 8, we
4243 use the least significant bit to record whether we
4244 have initialized it already.
4245
4246 When doing a dynamic link, we create a .rela.got
4247 relocation entry to initialize the value. This is
4248 done in the finish_dynamic_symbol routine. */
4249 if ((off & 1) != 0)
4250 off &= ~1;
4251 else
4252 {
4253 bfd_put_64 (output_bfd, relocation,
4254 base_got->contents + off);
4255 /* Note that this is harmless for the GOTPLT64 case,
4256 as -1 | 1 still is -1. */
4257 h->got.offset |= 1;
4258 }
4259 }
4260 else
4261 unresolved_reloc = FALSE;
4262 }
4263 else
4264 {
4265 if (local_got_offsets == NULL)
4266 abort ();
4267
4268 off = local_got_offsets[r_symndx];
4269
4270 /* The offset must always be a multiple of 8. We use
4271 the least significant bit to record whether we have
4272 already generated the necessary reloc. */
4273 if ((off & 1) != 0)
4274 off &= ~1;
4275 else
4276 {
4277 bfd_put_64 (output_bfd, relocation,
4278 base_got->contents + off);
4279
4280 if (bfd_link_pic (info))
4281 {
4282 asection *s;
4283 Elf_Internal_Rela outrel;
4284
4285 /* We need to generate a R_X86_64_RELATIVE reloc
4286 for the dynamic linker. */
4287 s = htab->elf.srelgot;
4288 if (s == NULL)
4289 abort ();
4290
4291 outrel.r_offset = (base_got->output_section->vma
4292 + base_got->output_offset
4293 + off);
4294 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4295 outrel.r_addend = relocation;
4296 elf_append_rela (output_bfd, s, &outrel);
4297 }
4298
4299 local_got_offsets[r_symndx] |= 1;
4300 }
4301 }
4302
4303 if (off >= (bfd_vma) -2)
4304 abort ();
4305
4306 relocation = base_got->output_section->vma
4307 + base_got->output_offset + off;
4308 if (r_type != R_X86_64_GOTPCREL
4309 && r_type != R_X86_64_GOTPCRELX
4310 && r_type != R_X86_64_REX_GOTPCRELX
4311 && r_type != R_X86_64_GOTPCREL64)
4312 relocation -= htab->elf.sgotplt->output_section->vma
4313 - htab->elf.sgotplt->output_offset;
4314
4315 break;
4316
4317 case R_X86_64_GOTOFF64:
4318 /* Relocation is relative to the start of the global offset
4319 table. */
4320
4321 /* Check to make sure it isn't a protected function or data
4322 symbol for shared library since it may not be local when
4323 used as function address or with copy relocation. We also
4324 need to make sure that a symbol is referenced locally. */
4325 if (bfd_link_pic (info) && h)
4326 {
4327 if (!h->def_regular)
4328 {
4329 const char *v;
4330
4331 switch (ELF_ST_VISIBILITY (h->other))
4332 {
4333 case STV_HIDDEN:
4334 v = _("hidden symbol");
4335 break;
4336 case STV_INTERNAL:
4337 v = _("internal symbol");
4338 break;
4339 case STV_PROTECTED:
4340 v = _("protected symbol");
4341 break;
4342 default:
4343 v = _("symbol");
4344 break;
4345 }
4346
4347 (*_bfd_error_handler)
4348 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4349 input_bfd, v, h->root.root.string);
4350 bfd_set_error (bfd_error_bad_value);
4351 return FALSE;
4352 }
4353 else if (!bfd_link_executable (info)
4354 && !SYMBOL_REFERENCES_LOCAL (info, h)
4355 && (h->type == STT_FUNC
4356 || h->type == STT_OBJECT)
4357 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4358 {
4359 (*_bfd_error_handler)
4360 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4361 input_bfd,
4362 h->type == STT_FUNC ? "function" : "data",
4363 h->root.root.string);
4364 bfd_set_error (bfd_error_bad_value);
4365 return FALSE;
4366 }
4367 }
4368
4369 /* Note that sgot is not involved in this
4370 calculation. We always want the start of .got.plt. If we
4371 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4372 permitted by the ABI, we might have to change this
4373 calculation. */
4374 relocation -= htab->elf.sgotplt->output_section->vma
4375 + htab->elf.sgotplt->output_offset;
4376 break;
4377
4378 case R_X86_64_GOTPC32:
4379 case R_X86_64_GOTPC64:
4380 /* Use global offset table as symbol value. */
4381 relocation = htab->elf.sgotplt->output_section->vma
4382 + htab->elf.sgotplt->output_offset;
4383 unresolved_reloc = FALSE;
4384 break;
4385
4386 case R_X86_64_PLTOFF64:
4387 /* Relocation is PLT entry relative to GOT. For local
4388 symbols it's the symbol itself relative to GOT. */
4389 if (h != NULL
4390 /* See PLT32 handling. */
4391 && h->plt.offset != (bfd_vma) -1
4392 && htab->elf.splt != NULL)
4393 {
4394 if (htab->plt_bnd != NULL)
4395 {
4396 resolved_plt = htab->plt_bnd;
4397 plt_offset = eh->plt_bnd.offset;
4398 }
4399 else
4400 {
4401 resolved_plt = htab->elf.splt;
4402 plt_offset = h->plt.offset;
4403 }
4404
4405 relocation = (resolved_plt->output_section->vma
4406 + resolved_plt->output_offset
4407 + plt_offset);
4408 unresolved_reloc = FALSE;
4409 }
4410
4411 relocation -= htab->elf.sgotplt->output_section->vma
4412 + htab->elf.sgotplt->output_offset;
4413 break;
4414
4415 case R_X86_64_PLT32:
4416 case R_X86_64_PLT32_BND:
4417 /* Relocation is to the entry for this symbol in the
4418 procedure linkage table. */
4419
4420 /* Resolve a PLT32 reloc against a local symbol directly,
4421 without using the procedure linkage table. */
4422 if (h == NULL)
4423 break;
4424
4425 if ((h->plt.offset == (bfd_vma) -1
4426 && eh->plt_got.offset == (bfd_vma) -1)
4427 || htab->elf.splt == NULL)
4428 {
4429 /* We didn't make a PLT entry for this symbol. This
4430 happens when statically linking PIC code, or when
4431 using -Bsymbolic. */
4432 break;
4433 }
4434
4435 if (h->plt.offset != (bfd_vma) -1)
4436 {
4437 if (htab->plt_bnd != NULL)
4438 {
4439 resolved_plt = htab->plt_bnd;
4440 plt_offset = eh->plt_bnd.offset;
4441 }
4442 else
4443 {
4444 resolved_plt = htab->elf.splt;
4445 plt_offset = h->plt.offset;
4446 }
4447 }
4448 else
4449 {
4450 /* Use the GOT PLT. */
4451 resolved_plt = htab->plt_got;
4452 plt_offset = eh->plt_got.offset;
4453 }
4454
4455 relocation = (resolved_plt->output_section->vma
4456 + resolved_plt->output_offset
4457 + plt_offset);
4458 unresolved_reloc = FALSE;
4459 break;
4460
4461 case R_X86_64_SIZE32:
4462 case R_X86_64_SIZE64:
4463 /* Set to symbol size. */
4464 relocation = st_size;
4465 goto direct;
4466
4467 case R_X86_64_PC8:
4468 case R_X86_64_PC16:
4469 case R_X86_64_PC32:
4470 case R_X86_64_PC32_BND:
4471 /* Don't complain about -fPIC if the symbol is undefined when
4472 building executable. */
4473 if (bfd_link_pic (info)
4474 && (input_section->flags & SEC_ALLOC) != 0
4475 && (input_section->flags & SEC_READONLY) != 0
4476 && h != NULL
4477 && !(bfd_link_executable (info)
4478 && h->root.type == bfd_link_hash_undefined))
4479 {
4480 bfd_boolean fail = FALSE;
4481 bfd_boolean branch
4482 = ((r_type == R_X86_64_PC32
4483 || r_type == R_X86_64_PC32_BND)
4484 && is_32bit_relative_branch (contents, rel->r_offset));
4485
4486 if (SYMBOL_REFERENCES_LOCAL (info, h))
4487 {
4488 /* Symbol is referenced locally. Make sure it is
4489 defined locally or for a branch. */
4490 fail = !h->def_regular && !branch;
4491 }
4492 else if (!(bfd_link_executable (info)
4493 && (h->needs_copy || eh->needs_copy)))
4494 {
4495 /* Symbol doesn't need copy reloc and isn't referenced
4496 locally. We only allow branch to symbol with
4497 non-default visibility. */
4498 fail = (!branch
4499 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4500 }
4501
4502 if (fail)
4503 {
4504 const char *fmt;
4505 const char *v;
4506 const char *pic = "";
4507
4508 switch (ELF_ST_VISIBILITY (h->other))
4509 {
4510 case STV_HIDDEN:
4511 v = _("hidden symbol");
4512 break;
4513 case STV_INTERNAL:
4514 v = _("internal symbol");
4515 break;
4516 case STV_PROTECTED:
4517 v = _("protected symbol");
4518 break;
4519 default:
4520 v = _("symbol");
4521 pic = _("; recompile with -fPIC");
4522 break;
4523 }
4524
4525 if (h->def_regular)
4526 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
4527 else
4528 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
4529
4530 (*_bfd_error_handler) (fmt, input_bfd,
4531 x86_64_elf_howto_table[r_type].name,
4532 v, h->root.root.string, pic);
4533 bfd_set_error (bfd_error_bad_value);
4534 return FALSE;
4535 }
4536 }
4537 /* Fall through. */
4538
4539 case R_X86_64_8:
4540 case R_X86_64_16:
4541 case R_X86_64_32:
4542 case R_X86_64_PC64:
4543 case R_X86_64_64:
4544 /* FIXME: The ABI says the linker should make sure the value is
4545 the same when it's zeroextended to 64 bit. */
4546
4547 direct:
4548 if ((input_section->flags & SEC_ALLOC) == 0)
4549 break;
4550
4551 /* Don't copy a pc-relative relocation into the output file
4552 if the symbol needs copy reloc or the symbol is undefined
4553 when building executable. Copy dynamic function pointer
4554 relocations. */
4555 if ((bfd_link_pic (info)
4556 && !(bfd_link_executable (info)
4557 && h != NULL
4558 && (h->needs_copy
4559 || eh->needs_copy
4560 || h->root.type == bfd_link_hash_undefined)
4561 && IS_X86_64_PCREL_TYPE (r_type))
4562 && (h == NULL
4563 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4564 || h->root.type != bfd_link_hash_undefweak)
4565 && ((! IS_X86_64_PCREL_TYPE (r_type)
4566 && r_type != R_X86_64_SIZE32
4567 && r_type != R_X86_64_SIZE64)
4568 || ! SYMBOL_CALLS_LOCAL (info, h)))
4569 || (ELIMINATE_COPY_RELOCS
4570 && !bfd_link_pic (info)
4571 && h != NULL
4572 && h->dynindx != -1
4573 && (!h->non_got_ref || eh->func_pointer_refcount > 0)
4574 && ((h->def_dynamic
4575 && !h->def_regular)
4576 || h->root.type == bfd_link_hash_undefweak
4577 || h->root.type == bfd_link_hash_undefined)))
4578 {
4579 Elf_Internal_Rela outrel;
4580 bfd_boolean skip, relocate;
4581 asection *sreloc;
4582
4583 /* When generating a shared object, these relocations
4584 are copied into the output file to be resolved at run
4585 time. */
4586 skip = FALSE;
4587 relocate = FALSE;
4588
4589 outrel.r_offset =
4590 _bfd_elf_section_offset (output_bfd, info, input_section,
4591 rel->r_offset);
4592 if (outrel.r_offset == (bfd_vma) -1)
4593 skip = TRUE;
4594 else if (outrel.r_offset == (bfd_vma) -2)
4595 skip = TRUE, relocate = TRUE;
4596
4597 outrel.r_offset += (input_section->output_section->vma
4598 + input_section->output_offset);
4599
4600 if (skip)
4601 memset (&outrel, 0, sizeof outrel);
4602
4603 /* h->dynindx may be -1 if this symbol was marked to
4604 become local. */
4605 else if (h != NULL
4606 && h->dynindx != -1
4607 && (IS_X86_64_PCREL_TYPE (r_type)
4608 || ! bfd_link_pic (info)
4609 || ! SYMBOLIC_BIND (info, h)
4610 || ! h->def_regular))
4611 {
4612 outrel.r_info = htab->r_info (h->dynindx, r_type);
4613 outrel.r_addend = rel->r_addend;
4614 }
4615 else
4616 {
4617 /* This symbol is local, or marked to become local. */
4618 if (r_type == htab->pointer_r_type)
4619 {
4620 relocate = TRUE;
4621 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4622 outrel.r_addend = relocation + rel->r_addend;
4623 }
4624 else if (r_type == R_X86_64_64
4625 && !ABI_64_P (output_bfd))
4626 {
4627 relocate = TRUE;
4628 outrel.r_info = htab->r_info (0,
4629 R_X86_64_RELATIVE64);
4630 outrel.r_addend = relocation + rel->r_addend;
4631 /* Check addend overflow. */
4632 if ((outrel.r_addend & 0x80000000)
4633 != (rel->r_addend & 0x80000000))
4634 {
4635 const char *name;
4636 int addend = rel->r_addend;
4637 if (h && h->root.root.string)
4638 name = h->root.root.string;
4639 else
4640 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4641 sym, NULL);
4642 if (addend < 0)
4643 (*_bfd_error_handler)
4644 (_("%B: addend -0x%x in relocation %s against "
4645 "symbol `%s' at 0x%lx in section `%A' is "
4646 "out of range"),
4647 input_bfd, input_section, addend,
4648 x86_64_elf_howto_table[r_type].name,
4649 name, (unsigned long) rel->r_offset);
4650 else
4651 (*_bfd_error_handler)
4652 (_("%B: addend 0x%x in relocation %s against "
4653 "symbol `%s' at 0x%lx in section `%A' is "
4654 "out of range"),
4655 input_bfd, input_section, addend,
4656 x86_64_elf_howto_table[r_type].name,
4657 name, (unsigned long) rel->r_offset);
4658 bfd_set_error (bfd_error_bad_value);
4659 return FALSE;
4660 }
4661 }
4662 else
4663 {
4664 long sindx;
4665
4666 if (bfd_is_abs_section (sec))
4667 sindx = 0;
4668 else if (sec == NULL || sec->owner == NULL)
4669 {
4670 bfd_set_error (bfd_error_bad_value);
4671 return FALSE;
4672 }
4673 else
4674 {
4675 asection *osec;
4676
4677 /* We are turning this relocation into one
4678 against a section symbol. It would be
4679 proper to subtract the symbol's value,
4680 osec->vma, from the emitted reloc addend,
4681 but ld.so expects buggy relocs. */
4682 osec = sec->output_section;
4683 sindx = elf_section_data (osec)->dynindx;
4684 if (sindx == 0)
4685 {
4686 asection *oi = htab->elf.text_index_section;
4687 sindx = elf_section_data (oi)->dynindx;
4688 }
4689 BFD_ASSERT (sindx != 0);
4690 }
4691
4692 outrel.r_info = htab->r_info (sindx, r_type);
4693 outrel.r_addend = relocation + rel->r_addend;
4694 }
4695 }
4696
4697 sreloc = elf_section_data (input_section)->sreloc;
4698
4699 if (sreloc == NULL || sreloc->contents == NULL)
4700 {
4701 r = bfd_reloc_notsupported;
4702 goto check_relocation_error;
4703 }
4704
4705 elf_append_rela (output_bfd, sreloc, &outrel);
4706
4707 /* If this reloc is against an external symbol, we do
4708 not want to fiddle with the addend. Otherwise, we
4709 need to include the symbol value so that it becomes
4710 an addend for the dynamic reloc. */
4711 if (! relocate)
4712 continue;
4713 }
4714
4715 break;
4716
4717 case R_X86_64_TLSGD:
4718 case R_X86_64_GOTPC32_TLSDESC:
4719 case R_X86_64_TLSDESC_CALL:
4720 case R_X86_64_GOTTPOFF:
4721 tls_type = GOT_UNKNOWN;
4722 if (h == NULL && local_got_offsets)
4723 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
4724 else if (h != NULL)
4725 tls_type = elf_x86_64_hash_entry (h)->tls_type;
4726
4727 if (! elf_x86_64_tls_transition (info, input_bfd,
4728 input_section, contents,
4729 symtab_hdr, sym_hashes,
4730 &r_type, tls_type, rel,
4731 relend, h, r_symndx))
4732 return FALSE;
4733
4734 if (r_type == R_X86_64_TPOFF32)
4735 {
4736 bfd_vma roff = rel->r_offset;
4737
4738 BFD_ASSERT (! unresolved_reloc);
4739
4740 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4741 {
4742 /* GD->LE transition. For 64bit, change
4743 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4744 .word 0x6666; rex64; call __tls_get_addr
4745 into:
4746 movq %fs:0, %rax
4747 leaq foo@tpoff(%rax), %rax
4748 For 32bit, change
4749 leaq foo@tlsgd(%rip), %rdi
4750 .word 0x6666; rex64; call __tls_get_addr
4751 into:
4752 movl %fs:0, %eax
4753 leaq foo@tpoff(%rax), %rax
4754 For largepic, change:
4755 leaq foo@tlsgd(%rip), %rdi
4756 movabsq $__tls_get_addr@pltoff, %rax
4757 addq %rbx, %rax
4758 call *%rax
4759 into:
4760 movq %fs:0, %rax
4761 leaq foo@tpoff(%rax), %rax
4762 nopw 0x0(%rax,%rax,1) */
4763 int largepic = 0;
4764 if (ABI_64_P (output_bfd)
4765 && contents[roff + 5] == (bfd_byte) '\xb8')
4766 {
4767 memcpy (contents + roff - 3,
4768 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4769 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4770 largepic = 1;
4771 }
4772 else if (ABI_64_P (output_bfd))
4773 memcpy (contents + roff - 4,
4774 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4775 16);
4776 else
4777 memcpy (contents + roff - 3,
4778 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4779 15);
4780 bfd_put_32 (output_bfd,
4781 elf_x86_64_tpoff (info, relocation),
4782 contents + roff + 8 + largepic);
4783 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4784 rel++;
4785 continue;
4786 }
4787 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4788 {
4789 /* GDesc -> LE transition.
4790 It's originally something like:
4791 leaq x@tlsdesc(%rip), %rax
4792
4793 Change it to:
4794 movl $x@tpoff, %rax. */
4795
4796 unsigned int val, type;
4797
4798 type = bfd_get_8 (input_bfd, contents + roff - 3);
4799 val = bfd_get_8 (input_bfd, contents + roff - 1);
4800 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4801 contents + roff - 3);
4802 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4803 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4804 contents + roff - 1);
4805 bfd_put_32 (output_bfd,
4806 elf_x86_64_tpoff (info, relocation),
4807 contents + roff);
4808 continue;
4809 }
4810 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4811 {
4812 /* GDesc -> LE transition.
4813 It's originally:
4814 call *(%rax)
4815 Turn it into:
4816 xchg %ax,%ax. */
4817 bfd_put_8 (output_bfd, 0x66, contents + roff);
4818 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4819 continue;
4820 }
4821 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4822 {
4823 /* IE->LE transition:
4824 For 64bit, originally it can be one of:
4825 movq foo@gottpoff(%rip), %reg
4826 addq foo@gottpoff(%rip), %reg
4827 We change it into:
4828 movq $foo, %reg
4829 leaq foo(%reg), %reg
4830 addq $foo, %reg.
4831 For 32bit, originally it can be one of:
4832 movq foo@gottpoff(%rip), %reg
4833 addl foo@gottpoff(%rip), %reg
4834 We change it into:
4835 movq $foo, %reg
4836 leal foo(%reg), %reg
4837 addl $foo, %reg. */
4838
4839 unsigned int val, type, reg;
4840
4841 if (roff >= 3)
4842 val = bfd_get_8 (input_bfd, contents + roff - 3);
4843 else
4844 val = 0;
4845 type = bfd_get_8 (input_bfd, contents + roff - 2);
4846 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4847 reg >>= 3;
4848 if (type == 0x8b)
4849 {
4850 /* movq */
4851 if (val == 0x4c)
4852 bfd_put_8 (output_bfd, 0x49,
4853 contents + roff - 3);
4854 else if (!ABI_64_P (output_bfd) && val == 0x44)
4855 bfd_put_8 (output_bfd, 0x41,
4856 contents + roff - 3);
4857 bfd_put_8 (output_bfd, 0xc7,
4858 contents + roff - 2);
4859 bfd_put_8 (output_bfd, 0xc0 | reg,
4860 contents + roff - 1);
4861 }
4862 else if (reg == 4)
4863 {
4864 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4865 is special */
4866 if (val == 0x4c)
4867 bfd_put_8 (output_bfd, 0x49,
4868 contents + roff - 3);
4869 else if (!ABI_64_P (output_bfd) && val == 0x44)
4870 bfd_put_8 (output_bfd, 0x41,
4871 contents + roff - 3);
4872 bfd_put_8 (output_bfd, 0x81,
4873 contents + roff - 2);
4874 bfd_put_8 (output_bfd, 0xc0 | reg,
4875 contents + roff - 1);
4876 }
4877 else
4878 {
4879 /* addq/addl -> leaq/leal */
4880 if (val == 0x4c)
4881 bfd_put_8 (output_bfd, 0x4d,
4882 contents + roff - 3);
4883 else if (!ABI_64_P (output_bfd) && val == 0x44)
4884 bfd_put_8 (output_bfd, 0x45,
4885 contents + roff - 3);
4886 bfd_put_8 (output_bfd, 0x8d,
4887 contents + roff - 2);
4888 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4889 contents + roff - 1);
4890 }
4891 bfd_put_32 (output_bfd,
4892 elf_x86_64_tpoff (info, relocation),
4893 contents + roff);
4894 continue;
4895 }
4896 else
4897 BFD_ASSERT (FALSE);
4898 }
4899
4900 if (htab->elf.sgot == NULL)
4901 abort ();
4902
4903 if (h != NULL)
4904 {
4905 off = h->got.offset;
4906 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
4907 }
4908 else
4909 {
4910 if (local_got_offsets == NULL)
4911 abort ();
4912
4913 off = local_got_offsets[r_symndx];
4914 offplt = local_tlsdesc_gotents[r_symndx];
4915 }
4916
4917 if ((off & 1) != 0)
4918 off &= ~1;
4919 else
4920 {
4921 Elf_Internal_Rela outrel;
4922 int dr_type, indx;
4923 asection *sreloc;
4924
4925 if (htab->elf.srelgot == NULL)
4926 abort ();
4927
4928 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4929
4930 if (GOT_TLS_GDESC_P (tls_type))
4931 {
4932 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4933 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4934 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4935 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4936 + htab->elf.sgotplt->output_offset
4937 + offplt
4938 + htab->sgotplt_jump_table_size);
4939 sreloc = htab->elf.srelplt;
4940 if (indx == 0)
4941 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4942 else
4943 outrel.r_addend = 0;
4944 elf_append_rela (output_bfd, sreloc, &outrel);
4945 }
4946
4947 sreloc = htab->elf.srelgot;
4948
4949 outrel.r_offset = (htab->elf.sgot->output_section->vma
4950 + htab->elf.sgot->output_offset + off);
4951
4952 if (GOT_TLS_GD_P (tls_type))
4953 dr_type = R_X86_64_DTPMOD64;
4954 else if (GOT_TLS_GDESC_P (tls_type))
4955 goto dr_done;
4956 else
4957 dr_type = R_X86_64_TPOFF64;
4958
4959 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4960 outrel.r_addend = 0;
4961 if ((dr_type == R_X86_64_TPOFF64
4962 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4963 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
4964 outrel.r_info = htab->r_info (indx, dr_type);
4965
4966 elf_append_rela (output_bfd, sreloc, &outrel);
4967
4968 if (GOT_TLS_GD_P (tls_type))
4969 {
4970 if (indx == 0)
4971 {
4972 BFD_ASSERT (! unresolved_reloc);
4973 bfd_put_64 (output_bfd,
4974 relocation - elf_x86_64_dtpoff_base (info),
4975 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4976 }
4977 else
4978 {
4979 bfd_put_64 (output_bfd, 0,
4980 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4981 outrel.r_info = htab->r_info (indx,
4982 R_X86_64_DTPOFF64);
4983 outrel.r_offset += GOT_ENTRY_SIZE;
4984 elf_append_rela (output_bfd, sreloc,
4985 &outrel);
4986 }
4987 }
4988
4989 dr_done:
4990 if (h != NULL)
4991 h->got.offset |= 1;
4992 else
4993 local_got_offsets[r_symndx] |= 1;
4994 }
4995
4996 if (off >= (bfd_vma) -2
4997 && ! GOT_TLS_GDESC_P (tls_type))
4998 abort ();
4999 if (r_type == ELF32_R_TYPE (rel->r_info))
5000 {
5001 if (r_type == R_X86_64_GOTPC32_TLSDESC
5002 || r_type == R_X86_64_TLSDESC_CALL)
5003 relocation = htab->elf.sgotplt->output_section->vma
5004 + htab->elf.sgotplt->output_offset
5005 + offplt + htab->sgotplt_jump_table_size;
5006 else
5007 relocation = htab->elf.sgot->output_section->vma
5008 + htab->elf.sgot->output_offset + off;
5009 unresolved_reloc = FALSE;
5010 }
5011 else
5012 {
5013 bfd_vma roff = rel->r_offset;
5014
5015 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
5016 {
5017 /* GD->IE transition. For 64bit, change
5018 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5019 .word 0x6666; rex64; call __tls_get_addr@plt
5020 into:
5021 movq %fs:0, %rax
5022 addq foo@gottpoff(%rip), %rax
5023 For 32bit, change
5024 leaq foo@tlsgd(%rip), %rdi
5025 .word 0x6666; rex64; call __tls_get_addr@plt
5026 into:
5027 movl %fs:0, %eax
5028 addq foo@gottpoff(%rip), %rax
5029 For largepic, change:
5030 leaq foo@tlsgd(%rip), %rdi
5031 movabsq $__tls_get_addr@pltoff, %rax
5032 addq %rbx, %rax
5033 call *%rax
5034 into:
5035 movq %fs:0, %rax
5036 addq foo@gottpoff(%rax), %rax
5037 nopw 0x0(%rax,%rax,1) */
5038 int largepic = 0;
5039 if (ABI_64_P (output_bfd)
5040 && contents[roff + 5] == (bfd_byte) '\xb8')
5041 {
5042 memcpy (contents + roff - 3,
5043 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5044 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5045 largepic = 1;
5046 }
5047 else if (ABI_64_P (output_bfd))
5048 memcpy (contents + roff - 4,
5049 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5050 16);
5051 else
5052 memcpy (contents + roff - 3,
5053 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5054 15);
5055
5056 relocation = (htab->elf.sgot->output_section->vma
5057 + htab->elf.sgot->output_offset + off
5058 - roff
5059 - largepic
5060 - input_section->output_section->vma
5061 - input_section->output_offset
5062 - 12);
5063 bfd_put_32 (output_bfd, relocation,
5064 contents + roff + 8 + largepic);
5065 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5066 rel++;
5067 continue;
5068 }
5069 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
5070 {
5071 /* GDesc -> IE transition.
5072 It's originally something like:
5073 leaq x@tlsdesc(%rip), %rax
5074
5075 Change it to:
5076 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5077
5078 /* Now modify the instruction as appropriate. To
5079 turn a leaq into a movq in the form we use it, it
5080 suffices to change the second byte from 0x8d to
5081 0x8b. */
5082 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
5083
5084 bfd_put_32 (output_bfd,
5085 htab->elf.sgot->output_section->vma
5086 + htab->elf.sgot->output_offset + off
5087 - rel->r_offset
5088 - input_section->output_section->vma
5089 - input_section->output_offset
5090 - 4,
5091 contents + roff);
5092 continue;
5093 }
5094 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
5095 {
5096 /* GDesc -> IE transition.
5097 It's originally:
5098 call *(%rax)
5099
5100 Change it to:
5101 xchg %ax, %ax. */
5102
5103 bfd_put_8 (output_bfd, 0x66, contents + roff);
5104 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5105 continue;
5106 }
5107 else
5108 BFD_ASSERT (FALSE);
5109 }
5110 break;
5111
5112 case R_X86_64_TLSLD:
5113 if (! elf_x86_64_tls_transition (info, input_bfd,
5114 input_section, contents,
5115 symtab_hdr, sym_hashes,
5116 &r_type, GOT_UNKNOWN,
5117 rel, relend, h, r_symndx))
5118 return FALSE;
5119
5120 if (r_type != R_X86_64_TLSLD)
5121 {
5122 /* LD->LE transition:
5123 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
5124 For 64bit, we change it into:
5125 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
5126 For 32bit, we change it into:
5127 nopl 0x0(%rax); movl %fs:0, %eax.
5128 For largepic, change:
5129 leaq foo@tlsgd(%rip), %rdi
5130 movabsq $__tls_get_addr@pltoff, %rax
5131 addq %rbx, %rax
5132 call *%rax
5133 into:
5134 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
5135 movq %fs:0, %eax */
5136
5137 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
5138 if (ABI_64_P (output_bfd)
5139 && contents[rel->r_offset + 5] == (bfd_byte) '\xb8')
5140 memcpy (contents + rel->r_offset - 3,
5141 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5142 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5143 else if (ABI_64_P (output_bfd))
5144 memcpy (contents + rel->r_offset - 3,
5145 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5146 else
5147 memcpy (contents + rel->r_offset - 3,
5148 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5149 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5150 rel++;
5151 continue;
5152 }
5153
5154 if (htab->elf.sgot == NULL)
5155 abort ();
5156
5157 off = htab->tls_ld_got.offset;
5158 if (off & 1)
5159 off &= ~1;
5160 else
5161 {
5162 Elf_Internal_Rela outrel;
5163
5164 if (htab->elf.srelgot == NULL)
5165 abort ();
5166
5167 outrel.r_offset = (htab->elf.sgot->output_section->vma
5168 + htab->elf.sgot->output_offset + off);
5169
5170 bfd_put_64 (output_bfd, 0,
5171 htab->elf.sgot->contents + off);
5172 bfd_put_64 (output_bfd, 0,
5173 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5174 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
5175 outrel.r_addend = 0;
5176 elf_append_rela (output_bfd, htab->elf.srelgot,
5177 &outrel);
5178 htab->tls_ld_got.offset |= 1;
5179 }
5180 relocation = htab->elf.sgot->output_section->vma
5181 + htab->elf.sgot->output_offset + off;
5182 unresolved_reloc = FALSE;
5183 break;
5184
5185 case R_X86_64_DTPOFF32:
5186 if (!bfd_link_executable (info)
5187 || (input_section->flags & SEC_CODE) == 0)
5188 relocation -= elf_x86_64_dtpoff_base (info);
5189 else
5190 relocation = elf_x86_64_tpoff (info, relocation);
5191 break;
5192
5193 case R_X86_64_TPOFF32:
5194 case R_X86_64_TPOFF64:
5195 BFD_ASSERT (bfd_link_executable (info));
5196 relocation = elf_x86_64_tpoff (info, relocation);
5197 break;
5198
5199 case R_X86_64_DTPOFF64:
5200 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
5201 relocation -= elf_x86_64_dtpoff_base (info);
5202 break;
5203
5204 default:
5205 break;
5206 }
5207
5208 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5209 because such sections are not SEC_ALLOC and thus ld.so will
5210 not process them. */
5211 if (unresolved_reloc
5212 && !((input_section->flags & SEC_DEBUGGING) != 0
5213 && h->def_dynamic)
5214 && _bfd_elf_section_offset (output_bfd, info, input_section,
5215 rel->r_offset) != (bfd_vma) -1)
5216 {
5217 (*_bfd_error_handler)
5218 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5219 input_bfd,
5220 input_section,
5221 (long) rel->r_offset,
5222 howto->name,
5223 h->root.root.string);
5224 return FALSE;
5225 }
5226
5227 do_relocation:
5228 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5229 contents, rel->r_offset,
5230 relocation, rel->r_addend);
5231
5232 check_relocation_error:
5233 if (r != bfd_reloc_ok)
5234 {
5235 const char *name;
5236
5237 if (h != NULL)
5238 name = h->root.root.string;
5239 else
5240 {
5241 name = bfd_elf_string_from_elf_section (input_bfd,
5242 symtab_hdr->sh_link,
5243 sym->st_name);
5244 if (name == NULL)
5245 return FALSE;
5246 if (*name == '\0')
5247 name = bfd_section_name (input_bfd, sec);
5248 }
5249
5250 if (r == bfd_reloc_overflow)
5251 {
5252 if (! ((*info->callbacks->reloc_overflow)
5253 (info, (h ? &h->root : NULL), name, howto->name,
5254 (bfd_vma) 0, input_bfd, input_section,
5255 rel->r_offset)))
5256 return FALSE;
5257 }
5258 else
5259 {
5260 (*_bfd_error_handler)
5261 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5262 input_bfd, input_section,
5263 (long) rel->r_offset, name, (int) r);
5264 return FALSE;
5265 }
5266 }
5267 }
5268
5269 return TRUE;
5270 }
5271
5272 /* Finish up dynamic symbol handling. We set the contents of various
5273 dynamic sections here. */
5274
5275 static bfd_boolean
5276 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
5277 struct bfd_link_info *info,
5278 struct elf_link_hash_entry *h,
5279 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
5280 {
5281 struct elf_x86_64_link_hash_table *htab;
5282 const struct elf_x86_64_backend_data *abed;
5283 bfd_boolean use_plt_bnd;
5284 struct elf_x86_64_link_hash_entry *eh;
5285
5286 htab = elf_x86_64_hash_table (info);
5287 if (htab == NULL)
5288 return FALSE;
5289
5290 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5291 section only if there is .plt section. */
5292 use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL;
5293 abed = (use_plt_bnd
5294 ? &elf_x86_64_bnd_arch_bed
5295 : get_elf_x86_64_backend_data (output_bfd));
5296
5297 eh = (struct elf_x86_64_link_hash_entry *) h;
5298
5299 if (h->plt.offset != (bfd_vma) -1)
5300 {
5301 bfd_vma plt_index;
5302 bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset;
5303 bfd_vma plt_plt_insn_end, plt_got_insn_size;
5304 Elf_Internal_Rela rela;
5305 bfd_byte *loc;
5306 asection *plt, *gotplt, *relplt, *resolved_plt;
5307 const struct elf_backend_data *bed;
5308 bfd_vma plt_got_pcrel_offset;
5309
5310 /* When building a static executable, use .iplt, .igot.plt and
5311 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5312 if (htab->elf.splt != NULL)
5313 {
5314 plt = htab->elf.splt;
5315 gotplt = htab->elf.sgotplt;
5316 relplt = htab->elf.srelplt;
5317 }
5318 else
5319 {
5320 plt = htab->elf.iplt;
5321 gotplt = htab->elf.igotplt;
5322 relplt = htab->elf.irelplt;
5323 }
5324
5325 /* This symbol has an entry in the procedure linkage table. Set
5326 it up. */
5327 if ((h->dynindx == -1
5328 && !((h->forced_local || bfd_link_executable (info))
5329 && h->def_regular
5330 && h->type == STT_GNU_IFUNC))
5331 || plt == NULL
5332 || gotplt == NULL
5333 || relplt == NULL)
5334 abort ();
5335
5336 /* Get the index in the procedure linkage table which
5337 corresponds to this symbol. This is the index of this symbol
5338 in all the symbols for which we are making plt entries. The
5339 first entry in the procedure linkage table is reserved.
5340
5341 Get the offset into the .got table of the entry that
5342 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5343 bytes. The first three are reserved for the dynamic linker.
5344
5345 For static executables, we don't reserve anything. */
5346
5347 if (plt == htab->elf.splt)
5348 {
5349 got_offset = h->plt.offset / abed->plt_entry_size - 1;
5350 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
5351 }
5352 else
5353 {
5354 got_offset = h->plt.offset / abed->plt_entry_size;
5355 got_offset = got_offset * GOT_ENTRY_SIZE;
5356 }
5357
5358 plt_plt_insn_end = abed->plt_plt_insn_end;
5359 plt_plt_offset = abed->plt_plt_offset;
5360 plt_got_insn_size = abed->plt_got_insn_size;
5361 plt_got_offset = abed->plt_got_offset;
5362 if (use_plt_bnd)
5363 {
5364 /* Use the second PLT with BND relocations. */
5365 const bfd_byte *plt_entry, *plt2_entry;
5366
5367 if (eh->has_bnd_reloc)
5368 {
5369 plt_entry = elf_x86_64_bnd_plt_entry;
5370 plt2_entry = elf_x86_64_bnd_plt2_entry;
5371 }
5372 else
5373 {
5374 plt_entry = elf_x86_64_legacy_plt_entry;
5375 plt2_entry = elf_x86_64_legacy_plt2_entry;
5376
5377 /* Subtract 1 since there is no BND prefix. */
5378 plt_plt_insn_end -= 1;
5379 plt_plt_offset -= 1;
5380 plt_got_insn_size -= 1;
5381 plt_got_offset -= 1;
5382 }
5383
5384 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry)
5385 == sizeof (elf_x86_64_legacy_plt_entry));
5386
5387 /* Fill in the entry in the procedure linkage table. */
5388 memcpy (plt->contents + h->plt.offset,
5389 plt_entry, sizeof (elf_x86_64_legacy_plt_entry));
5390 /* Fill in the entry in the second PLT. */
5391 memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset,
5392 plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5393
5394 resolved_plt = htab->plt_bnd;
5395 plt_offset = eh->plt_bnd.offset;
5396 }
5397 else
5398 {
5399 /* Fill in the entry in the procedure linkage table. */
5400 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
5401 abed->plt_entry_size);
5402
5403 resolved_plt = plt;
5404 plt_offset = h->plt.offset;
5405 }
5406
5407 /* Insert the relocation positions of the plt section. */
5408
5409 /* Put offset the PC-relative instruction referring to the GOT entry,
5410 subtracting the size of that instruction. */
5411 plt_got_pcrel_offset = (gotplt->output_section->vma
5412 + gotplt->output_offset
5413 + got_offset
5414 - resolved_plt->output_section->vma
5415 - resolved_plt->output_offset
5416 - plt_offset
5417 - plt_got_insn_size);
5418
5419 /* Check PC-relative offset overflow in PLT entry. */
5420 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5421 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5422 output_bfd, h->root.root.string);
5423
5424 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5425 resolved_plt->contents + plt_offset + plt_got_offset);
5426
5427 /* Fill in the entry in the global offset table, initially this
5428 points to the second part of the PLT entry. */
5429 bfd_put_64 (output_bfd, (plt->output_section->vma
5430 + plt->output_offset
5431 + h->plt.offset + abed->plt_lazy_offset),
5432 gotplt->contents + got_offset);
5433
5434 /* Fill in the entry in the .rela.plt section. */
5435 rela.r_offset = (gotplt->output_section->vma
5436 + gotplt->output_offset
5437 + got_offset);
5438 if (h->dynindx == -1
5439 || ((bfd_link_executable (info)
5440 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5441 && h->def_regular
5442 && h->type == STT_GNU_IFUNC))
5443 {
5444 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5445 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5446 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5447 rela.r_addend = (h->root.u.def.value
5448 + h->root.u.def.section->output_section->vma
5449 + h->root.u.def.section->output_offset);
5450 /* R_X86_64_IRELATIVE comes last. */
5451 plt_index = htab->next_irelative_index--;
5452 }
5453 else
5454 {
5455 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5456 rela.r_addend = 0;
5457 plt_index = htab->next_jump_slot_index++;
5458 }
5459
5460 /* Don't fill PLT entry for static executables. */
5461 if (plt == htab->elf.splt)
5462 {
5463 bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
5464
5465 /* Put relocation index. */
5466 bfd_put_32 (output_bfd, plt_index,
5467 plt->contents + h->plt.offset + abed->plt_reloc_offset);
5468
5469 /* Put offset for jmp .PLT0 and check for overflow. We don't
5470 check relocation index for overflow since branch displacement
5471 will overflow first. */
5472 if (plt0_offset > 0x80000000)
5473 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5474 output_bfd, h->root.root.string);
5475 bfd_put_32 (output_bfd, - plt0_offset,
5476 plt->contents + h->plt.offset + plt_plt_offset);
5477 }
5478
5479 bed = get_elf_backend_data (output_bfd);
5480 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5481 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5482 }
5483 else if (eh->plt_got.offset != (bfd_vma) -1)
5484 {
5485 bfd_vma got_offset, plt_offset, plt_got_offset, plt_got_insn_size;
5486 asection *plt, *got;
5487 bfd_boolean got_after_plt;
5488 int32_t got_pcrel_offset;
5489 const bfd_byte *got_plt_entry;
5490
5491 /* Set the entry in the GOT procedure linkage table. */
5492 plt = htab->plt_got;
5493 got = htab->elf.sgot;
5494 got_offset = h->got.offset;
5495
5496 if (got_offset == (bfd_vma) -1
5497 || h->type == STT_GNU_IFUNC
5498 || plt == NULL
5499 || got == NULL)
5500 abort ();
5501
5502 /* Use the second PLT entry template for the GOT PLT since they
5503 are the identical. */
5504 plt_got_insn_size = elf_x86_64_bnd_arch_bed.plt_got_insn_size;
5505 plt_got_offset = elf_x86_64_bnd_arch_bed.plt_got_offset;
5506 if (eh->has_bnd_reloc)
5507 got_plt_entry = elf_x86_64_bnd_plt2_entry;
5508 else
5509 {
5510 got_plt_entry = elf_x86_64_legacy_plt2_entry;
5511
5512 /* Subtract 1 since there is no BND prefix. */
5513 plt_got_insn_size -= 1;
5514 plt_got_offset -= 1;
5515 }
5516
5517 /* Fill in the entry in the GOT procedure linkage table. */
5518 plt_offset = eh->plt_got.offset;
5519 memcpy (plt->contents + plt_offset,
5520 got_plt_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5521
5522 /* Put offset the PC-relative instruction referring to the GOT
5523 entry, subtracting the size of that instruction. */
5524 got_pcrel_offset = (got->output_section->vma
5525 + got->output_offset
5526 + got_offset
5527 - plt->output_section->vma
5528 - plt->output_offset
5529 - plt_offset
5530 - plt_got_insn_size);
5531
5532 /* Check PC-relative offset overflow in GOT PLT entry. */
5533 got_after_plt = got->output_section->vma > plt->output_section->vma;
5534 if ((got_after_plt && got_pcrel_offset < 0)
5535 || (!got_after_plt && got_pcrel_offset > 0))
5536 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5537 output_bfd, h->root.root.string);
5538
5539 bfd_put_32 (output_bfd, got_pcrel_offset,
5540 plt->contents + plt_offset + plt_got_offset);
5541 }
5542
5543 if (!h->def_regular
5544 && (h->plt.offset != (bfd_vma) -1
5545 || eh->plt_got.offset != (bfd_vma) -1))
5546 {
5547 /* Mark the symbol as undefined, rather than as defined in
5548 the .plt section. Leave the value if there were any
5549 relocations where pointer equality matters (this is a clue
5550 for the dynamic linker, to make function pointer
5551 comparisons work between an application and shared
5552 library), otherwise set it to zero. If a function is only
5553 called from a binary, there is no need to slow down
5554 shared libraries because of that. */
5555 sym->st_shndx = SHN_UNDEF;
5556 if (!h->pointer_equality_needed)
5557 sym->st_value = 0;
5558 }
5559
5560 if (h->got.offset != (bfd_vma) -1
5561 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
5562 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
5563 {
5564 Elf_Internal_Rela rela;
5565
5566 /* This symbol has an entry in the global offset table. Set it
5567 up. */
5568 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5569 abort ();
5570
5571 rela.r_offset = (htab->elf.sgot->output_section->vma
5572 + htab->elf.sgot->output_offset
5573 + (h->got.offset &~ (bfd_vma) 1));
5574
5575 /* If this is a static link, or it is a -Bsymbolic link and the
5576 symbol is defined locally or was forced to be local because
5577 of a version file, we just want to emit a RELATIVE reloc.
5578 The entry in the global offset table will already have been
5579 initialized in the relocate_section function. */
5580 if (h->def_regular
5581 && h->type == STT_GNU_IFUNC)
5582 {
5583 if (bfd_link_pic (info))
5584 {
5585 /* Generate R_X86_64_GLOB_DAT. */
5586 goto do_glob_dat;
5587 }
5588 else
5589 {
5590 asection *plt;
5591
5592 if (!h->pointer_equality_needed)
5593 abort ();
5594
5595 /* For non-shared object, we can't use .got.plt, which
5596 contains the real function addres if we need pointer
5597 equality. We load the GOT entry with the PLT entry. */
5598 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5599 bfd_put_64 (output_bfd, (plt->output_section->vma
5600 + plt->output_offset
5601 + h->plt.offset),
5602 htab->elf.sgot->contents + h->got.offset);
5603 return TRUE;
5604 }
5605 }
5606 else if (bfd_link_pic (info)
5607 && SYMBOL_REFERENCES_LOCAL (info, h))
5608 {
5609 if (!h->def_regular)
5610 return FALSE;
5611 BFD_ASSERT((h->got.offset & 1) != 0);
5612 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5613 rela.r_addend = (h->root.u.def.value
5614 + h->root.u.def.section->output_section->vma
5615 + h->root.u.def.section->output_offset);
5616 }
5617 else
5618 {
5619 BFD_ASSERT((h->got.offset & 1) == 0);
5620 do_glob_dat:
5621 bfd_put_64 (output_bfd, (bfd_vma) 0,
5622 htab->elf.sgot->contents + h->got.offset);
5623 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5624 rela.r_addend = 0;
5625 }
5626
5627 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
5628 }
5629
5630 if (h->needs_copy)
5631 {
5632 Elf_Internal_Rela rela;
5633
5634 /* This symbol needs a copy reloc. Set it up. */
5635
5636 if (h->dynindx == -1
5637 || (h->root.type != bfd_link_hash_defined
5638 && h->root.type != bfd_link_hash_defweak)
5639 || htab->srelbss == NULL)
5640 abort ();
5641
5642 rela.r_offset = (h->root.u.def.value
5643 + h->root.u.def.section->output_section->vma
5644 + h->root.u.def.section->output_offset);
5645 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5646 rela.r_addend = 0;
5647 elf_append_rela (output_bfd, htab->srelbss, &rela);
5648 }
5649
5650 return TRUE;
5651 }
5652
5653 /* Finish up local dynamic symbol handling. We set the contents of
5654 various dynamic sections here. */
5655
5656 static bfd_boolean
5657 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5658 {
5659 struct elf_link_hash_entry *h
5660 = (struct elf_link_hash_entry *) *slot;
5661 struct bfd_link_info *info
5662 = (struct bfd_link_info *) inf;
5663
5664 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5665 info, h, NULL);
5666 }
5667
5668 /* Used to decide how to sort relocs in an optimal manner for the
5669 dynamic linker, before writing them out. */
5670
5671 static enum elf_reloc_type_class
5672 elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
5673 const asection *rel_sec ATTRIBUTE_UNUSED,
5674 const Elf_Internal_Rela *rela)
5675 {
5676 bfd *abfd = info->output_bfd;
5677 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5678 struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
5679 unsigned long r_symndx = htab->r_sym (rela->r_info);
5680 Elf_Internal_Sym sym;
5681
5682 if (htab->elf.dynsym == NULL
5683 || !bed->s->swap_symbol_in (abfd,
5684 (htab->elf.dynsym->contents
5685 + r_symndx * bed->s->sizeof_sym),
5686 0, &sym))
5687 abort ();
5688
5689 /* Check relocation against STT_GNU_IFUNC symbol. */
5690 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5691 return reloc_class_ifunc;
5692
5693 switch ((int) ELF32_R_TYPE (rela->r_info))
5694 {
5695 case R_X86_64_RELATIVE:
5696 case R_X86_64_RELATIVE64:
5697 return reloc_class_relative;
5698 case R_X86_64_JUMP_SLOT:
5699 return reloc_class_plt;
5700 case R_X86_64_COPY:
5701 return reloc_class_copy;
5702 default:
5703 return reloc_class_normal;
5704 }
5705 }
5706
5707 /* Finish up the dynamic sections. */
5708
5709 static bfd_boolean
5710 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5711 struct bfd_link_info *info)
5712 {
5713 struct elf_x86_64_link_hash_table *htab;
5714 bfd *dynobj;
5715 asection *sdyn;
5716 const struct elf_x86_64_backend_data *abed;
5717
5718 htab = elf_x86_64_hash_table (info);
5719 if (htab == NULL)
5720 return FALSE;
5721
5722 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5723 section only if there is .plt section. */
5724 abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL
5725 ? &elf_x86_64_bnd_arch_bed
5726 : get_elf_x86_64_backend_data (output_bfd));
5727
5728 dynobj = htab->elf.dynobj;
5729 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5730
5731 if (htab->elf.dynamic_sections_created)
5732 {
5733 bfd_byte *dyncon, *dynconend;
5734 const struct elf_backend_data *bed;
5735 bfd_size_type sizeof_dyn;
5736
5737 if (sdyn == NULL || htab->elf.sgot == NULL)
5738 abort ();
5739
5740 bed = get_elf_backend_data (dynobj);
5741 sizeof_dyn = bed->s->sizeof_dyn;
5742 dyncon = sdyn->contents;
5743 dynconend = sdyn->contents + sdyn->size;
5744 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5745 {
5746 Elf_Internal_Dyn dyn;
5747 asection *s;
5748
5749 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5750
5751 switch (dyn.d_tag)
5752 {
5753 default:
5754 continue;
5755
5756 case DT_PLTGOT:
5757 s = htab->elf.sgotplt;
5758 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5759 break;
5760
5761 case DT_JMPREL:
5762 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5763 break;
5764
5765 case DT_PLTRELSZ:
5766 s = htab->elf.srelplt->output_section;
5767 dyn.d_un.d_val = s->size;
5768 break;
5769
5770 case DT_RELASZ:
5771 /* The procedure linkage table relocs (DT_JMPREL) should
5772 not be included in the overall relocs (DT_RELA).
5773 Therefore, we override the DT_RELASZ entry here to
5774 make it not include the JMPREL relocs. Since the
5775 linker script arranges for .rela.plt to follow all
5776 other relocation sections, we don't have to worry
5777 about changing the DT_RELA entry. */
5778 if (htab->elf.srelplt != NULL)
5779 {
5780 s = htab->elf.srelplt->output_section;
5781 dyn.d_un.d_val -= s->size;
5782 }
5783 break;
5784
5785 case DT_TLSDESC_PLT:
5786 s = htab->elf.splt;
5787 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5788 + htab->tlsdesc_plt;
5789 break;
5790
5791 case DT_TLSDESC_GOT:
5792 s = htab->elf.sgot;
5793 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5794 + htab->tlsdesc_got;
5795 break;
5796 }
5797
5798 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5799 }
5800
5801 /* Fill in the special first entry in the procedure linkage table. */
5802 if (htab->elf.splt && htab->elf.splt->size > 0)
5803 {
5804 /* Fill in the first entry in the procedure linkage table. */
5805 memcpy (htab->elf.splt->contents,
5806 abed->plt0_entry, abed->plt_entry_size);
5807 /* Add offset for pushq GOT+8(%rip), since the instruction
5808 uses 6 bytes subtract this value. */
5809 bfd_put_32 (output_bfd,
5810 (htab->elf.sgotplt->output_section->vma
5811 + htab->elf.sgotplt->output_offset
5812 + 8
5813 - htab->elf.splt->output_section->vma
5814 - htab->elf.splt->output_offset
5815 - 6),
5816 htab->elf.splt->contents + abed->plt0_got1_offset);
5817 /* Add offset for the PC-relative instruction accessing GOT+16,
5818 subtracting the offset to the end of that instruction. */
5819 bfd_put_32 (output_bfd,
5820 (htab->elf.sgotplt->output_section->vma
5821 + htab->elf.sgotplt->output_offset
5822 + 16
5823 - htab->elf.splt->output_section->vma
5824 - htab->elf.splt->output_offset
5825 - abed->plt0_got2_insn_end),
5826 htab->elf.splt->contents + abed->plt0_got2_offset);
5827
5828 elf_section_data (htab->elf.splt->output_section)
5829 ->this_hdr.sh_entsize = abed->plt_entry_size;
5830
5831 if (htab->tlsdesc_plt)
5832 {
5833 bfd_put_64 (output_bfd, (bfd_vma) 0,
5834 htab->elf.sgot->contents + htab->tlsdesc_got);
5835
5836 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
5837 abed->plt0_entry, abed->plt_entry_size);
5838
5839 /* Add offset for pushq GOT+8(%rip), since the
5840 instruction uses 6 bytes subtract this value. */
5841 bfd_put_32 (output_bfd,
5842 (htab->elf.sgotplt->output_section->vma
5843 + htab->elf.sgotplt->output_offset
5844 + 8
5845 - htab->elf.splt->output_section->vma
5846 - htab->elf.splt->output_offset
5847 - htab->tlsdesc_plt
5848 - 6),
5849 htab->elf.splt->contents
5850 + htab->tlsdesc_plt + abed->plt0_got1_offset);
5851 /* Add offset for the PC-relative instruction accessing GOT+TDG,
5852 where TGD stands for htab->tlsdesc_got, subtracting the offset
5853 to the end of that instruction. */
5854 bfd_put_32 (output_bfd,
5855 (htab->elf.sgot->output_section->vma
5856 + htab->elf.sgot->output_offset
5857 + htab->tlsdesc_got
5858 - htab->elf.splt->output_section->vma
5859 - htab->elf.splt->output_offset
5860 - htab->tlsdesc_plt
5861 - abed->plt0_got2_insn_end),
5862 htab->elf.splt->contents
5863 + htab->tlsdesc_plt + abed->plt0_got2_offset);
5864 }
5865 }
5866 }
5867
5868 if (htab->plt_bnd != NULL)
5869 elf_section_data (htab->plt_bnd->output_section)
5870 ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry);
5871
5872 if (htab->elf.sgotplt)
5873 {
5874 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5875 {
5876 (*_bfd_error_handler)
5877 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5878 return FALSE;
5879 }
5880
5881 /* Fill in the first three entries in the global offset table. */
5882 if (htab->elf.sgotplt->size > 0)
5883 {
5884 /* Set the first entry in the global offset table to the address of
5885 the dynamic section. */
5886 if (sdyn == NULL)
5887 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
5888 else
5889 bfd_put_64 (output_bfd,
5890 sdyn->output_section->vma + sdyn->output_offset,
5891 htab->elf.sgotplt->contents);
5892 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5893 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
5894 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
5895 }
5896
5897 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
5898 GOT_ENTRY_SIZE;
5899 }
5900
5901 /* Adjust .eh_frame for .plt section. */
5902 if (htab->plt_eh_frame != NULL
5903 && htab->plt_eh_frame->contents != NULL)
5904 {
5905 if (htab->elf.splt != NULL
5906 && htab->elf.splt->size != 0
5907 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5908 && htab->elf.splt->output_section != NULL
5909 && htab->plt_eh_frame->output_section != NULL)
5910 {
5911 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5912 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5913 + htab->plt_eh_frame->output_offset
5914 + PLT_FDE_START_OFFSET;
5915 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5916 htab->plt_eh_frame->contents
5917 + PLT_FDE_START_OFFSET);
5918 }
5919 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5920 {
5921 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5922 htab->plt_eh_frame,
5923 htab->plt_eh_frame->contents))
5924 return FALSE;
5925 }
5926 }
5927
5928 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5929 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5930 = GOT_ENTRY_SIZE;
5931
5932 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5933 htab_traverse (htab->loc_hash_table,
5934 elf_x86_64_finish_local_dynamic_symbol,
5935 info);
5936
5937 return TRUE;
5938 }
5939
5940 /* Return an array of PLT entry symbol values. */
5941
5942 static bfd_vma *
5943 elf_x86_64_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5944 asection *relplt)
5945 {
5946 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5947 arelent *p;
5948 long count, i;
5949 bfd_vma *plt_sym_val;
5950 bfd_vma plt_offset;
5951 bfd_byte *plt_contents;
5952 const struct elf_x86_64_backend_data *bed;
5953 Elf_Internal_Shdr *hdr;
5954 asection *plt_bnd;
5955
5956 /* Get the .plt section contents. PLT passed down may point to the
5957 .plt.bnd section. Make sure that PLT always points to the .plt
5958 section. */
5959 plt_bnd = bfd_get_section_by_name (abfd, ".plt.bnd");
5960 if (plt_bnd)
5961 {
5962 if (plt != plt_bnd)
5963 abort ();
5964 plt = bfd_get_section_by_name (abfd, ".plt");
5965 if (plt == NULL)
5966 abort ();
5967 bed = &elf_x86_64_bnd_arch_bed;
5968 }
5969 else
5970 bed = get_elf_x86_64_backend_data (abfd);
5971
5972 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5973 if (plt_contents == NULL)
5974 return NULL;
5975 if (!bfd_get_section_contents (abfd, (asection *) plt,
5976 plt_contents, 0, plt->size))
5977 {
5978 bad_return:
5979 free (plt_contents);
5980 return NULL;
5981 }
5982
5983 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5984 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5985 goto bad_return;
5986
5987 hdr = &elf_section_data (relplt)->this_hdr;
5988 count = relplt->size / hdr->sh_entsize;
5989
5990 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5991 if (plt_sym_val == NULL)
5992 goto bad_return;
5993
5994 for (i = 0; i < count; i++)
5995 plt_sym_val[i] = -1;
5996
5997 plt_offset = bed->plt_entry_size;
5998 p = relplt->relocation;
5999 for (i = 0; i < count; i++, p++)
6000 {
6001 long reloc_index;
6002
6003 /* Skip unknown relocation. */
6004 if (p->howto == NULL)
6005 continue;
6006
6007 if (p->howto->type != R_X86_64_JUMP_SLOT
6008 && p->howto->type != R_X86_64_IRELATIVE)
6009 continue;
6010
6011 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
6012 + bed->plt_reloc_offset));
6013 if (reloc_index >= count)
6014 abort ();
6015 if (plt_bnd)
6016 {
6017 /* This is the index in .plt section. */
6018 long plt_index = plt_offset / bed->plt_entry_size;
6019 /* Store VMA + the offset in .plt.bnd section. */
6020 plt_sym_val[reloc_index] =
6021 (plt_bnd->vma
6022 + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
6023 }
6024 else
6025 plt_sym_val[reloc_index] = plt->vma + plt_offset;
6026 plt_offset += bed->plt_entry_size;
6027
6028 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6029 section. */
6030 if (plt_offset >= plt->size)
6031 break;
6032 }
6033
6034 free (plt_contents);
6035
6036 return plt_sym_val;
6037 }
6038
6039 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6040 support. */
6041
6042 static long
6043 elf_x86_64_get_synthetic_symtab (bfd *abfd,
6044 long symcount,
6045 asymbol **syms,
6046 long dynsymcount,
6047 asymbol **dynsyms,
6048 asymbol **ret)
6049 {
6050 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6051 as PLT if it exists. */
6052 asection *plt = bfd_get_section_by_name (abfd, ".plt.bnd");
6053 if (plt == NULL)
6054 plt = bfd_get_section_by_name (abfd, ".plt");
6055 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
6056 dynsymcount, dynsyms, ret,
6057 plt,
6058 elf_x86_64_get_plt_sym_val);
6059 }
6060
6061 /* Handle an x86-64 specific section when reading an object file. This
6062 is called when elfcode.h finds a section with an unknown type. */
6063
6064 static bfd_boolean
6065 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
6066 const char *name, int shindex)
6067 {
6068 if (hdr->sh_type != SHT_X86_64_UNWIND)
6069 return FALSE;
6070
6071 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
6072 return FALSE;
6073
6074 return TRUE;
6075 }
6076
6077 /* Hook called by the linker routine which adds symbols from an object
6078 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6079 of .bss. */
6080
6081 static bfd_boolean
6082 elf_x86_64_add_symbol_hook (bfd *abfd,
6083 struct bfd_link_info *info,
6084 Elf_Internal_Sym *sym,
6085 const char **namep ATTRIBUTE_UNUSED,
6086 flagword *flagsp ATTRIBUTE_UNUSED,
6087 asection **secp,
6088 bfd_vma *valp)
6089 {
6090 asection *lcomm;
6091
6092 switch (sym->st_shndx)
6093 {
6094 case SHN_X86_64_LCOMMON:
6095 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
6096 if (lcomm == NULL)
6097 {
6098 lcomm = bfd_make_section_with_flags (abfd,
6099 "LARGE_COMMON",
6100 (SEC_ALLOC
6101 | SEC_IS_COMMON
6102 | SEC_LINKER_CREATED));
6103 if (lcomm == NULL)
6104 return FALSE;
6105 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
6106 }
6107 *secp = lcomm;
6108 *valp = sym->st_size;
6109 return TRUE;
6110 }
6111
6112 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
6113 && (abfd->flags & DYNAMIC) == 0
6114 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
6115 elf_tdata (info->output_bfd)->has_gnu_symbols
6116 |= elf_gnu_symbol_unique;
6117
6118 return TRUE;
6119 }
6120
6121
6122 /* Given a BFD section, try to locate the corresponding ELF section
6123 index. */
6124
6125 static bfd_boolean
6126 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
6127 asection *sec, int *index_return)
6128 {
6129 if (sec == &_bfd_elf_large_com_section)
6130 {
6131 *index_return = SHN_X86_64_LCOMMON;
6132 return TRUE;
6133 }
6134 return FALSE;
6135 }
6136
6137 /* Process a symbol. */
6138
6139 static void
6140 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
6141 asymbol *asym)
6142 {
6143 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
6144
6145 switch (elfsym->internal_elf_sym.st_shndx)
6146 {
6147 case SHN_X86_64_LCOMMON:
6148 asym->section = &_bfd_elf_large_com_section;
6149 asym->value = elfsym->internal_elf_sym.st_size;
6150 /* Common symbol doesn't set BSF_GLOBAL. */
6151 asym->flags &= ~BSF_GLOBAL;
6152 break;
6153 }
6154 }
6155
6156 static bfd_boolean
6157 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
6158 {
6159 return (sym->st_shndx == SHN_COMMON
6160 || sym->st_shndx == SHN_X86_64_LCOMMON);
6161 }
6162
6163 static unsigned int
6164 elf_x86_64_common_section_index (asection *sec)
6165 {
6166 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6167 return SHN_COMMON;
6168 else
6169 return SHN_X86_64_LCOMMON;
6170 }
6171
6172 static asection *
6173 elf_x86_64_common_section (asection *sec)
6174 {
6175 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6176 return bfd_com_section_ptr;
6177 else
6178 return &_bfd_elf_large_com_section;
6179 }
6180
6181 static bfd_boolean
6182 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
6183 const Elf_Internal_Sym *sym,
6184 asection **psec,
6185 bfd_boolean newdef,
6186 bfd_boolean olddef,
6187 bfd *oldbfd,
6188 const asection *oldsec)
6189 {
6190 /* A normal common symbol and a large common symbol result in a
6191 normal common symbol. We turn the large common symbol into a
6192 normal one. */
6193 if (!olddef
6194 && h->root.type == bfd_link_hash_common
6195 && !newdef
6196 && bfd_is_com_section (*psec)
6197 && oldsec != *psec)
6198 {
6199 if (sym->st_shndx == SHN_COMMON
6200 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
6201 {
6202 h->root.u.c.p->section
6203 = bfd_make_section_old_way (oldbfd, "COMMON");
6204 h->root.u.c.p->section->flags = SEC_ALLOC;
6205 }
6206 else if (sym->st_shndx == SHN_X86_64_LCOMMON
6207 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
6208 *psec = bfd_com_section_ptr;
6209 }
6210
6211 return TRUE;
6212 }
6213
6214 static int
6215 elf_x86_64_additional_program_headers (bfd *abfd,
6216 struct bfd_link_info *info ATTRIBUTE_UNUSED)
6217 {
6218 asection *s;
6219 int count = 0;
6220
6221 /* Check to see if we need a large readonly segment. */
6222 s = bfd_get_section_by_name (abfd, ".lrodata");
6223 if (s && (s->flags & SEC_LOAD))
6224 count++;
6225
6226 /* Check to see if we need a large data segment. Since .lbss sections
6227 is placed right after the .bss section, there should be no need for
6228 a large data segment just because of .lbss. */
6229 s = bfd_get_section_by_name (abfd, ".ldata");
6230 if (s && (s->flags & SEC_LOAD))
6231 count++;
6232
6233 return count;
6234 }
6235
6236 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6237
6238 static bfd_boolean
6239 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
6240 {
6241 if (h->plt.offset != (bfd_vma) -1
6242 && !h->def_regular
6243 && !h->pointer_equality_needed)
6244 return FALSE;
6245
6246 return _bfd_elf_hash_symbol (h);
6247 }
6248
6249 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6250
6251 static bfd_boolean
6252 elf_x86_64_relocs_compatible (const bfd_target *input,
6253 const bfd_target *output)
6254 {
6255 return ((xvec_get_elf_backend_data (input)->s->elfclass
6256 == xvec_get_elf_backend_data (output)->s->elfclass)
6257 && _bfd_elf_relocs_compatible (input, output));
6258 }
6259
6260 static const struct bfd_elf_special_section
6261 elf_x86_64_special_sections[]=
6262 {
6263 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6264 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6265 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
6266 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6267 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6268 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6269 { NULL, 0, 0, 0, 0 }
6270 };
6271
6272 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6273 #define TARGET_LITTLE_NAME "elf64-x86-64"
6274 #define ELF_ARCH bfd_arch_i386
6275 #define ELF_TARGET_ID X86_64_ELF_DATA
6276 #define ELF_MACHINE_CODE EM_X86_64
6277 #define ELF_MAXPAGESIZE 0x200000
6278 #define ELF_MINPAGESIZE 0x1000
6279 #define ELF_COMMONPAGESIZE 0x1000
6280
6281 #define elf_backend_can_gc_sections 1
6282 #define elf_backend_can_refcount 1
6283 #define elf_backend_want_got_plt 1
6284 #define elf_backend_plt_readonly 1
6285 #define elf_backend_want_plt_sym 0
6286 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6287 #define elf_backend_rela_normal 1
6288 #define elf_backend_plt_alignment 4
6289 #define elf_backend_extern_protected_data 1
6290
6291 #define elf_info_to_howto elf_x86_64_info_to_howto
6292
6293 #define bfd_elf64_bfd_link_hash_table_create \
6294 elf_x86_64_link_hash_table_create
6295 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6296 #define bfd_elf64_bfd_reloc_name_lookup \
6297 elf_x86_64_reloc_name_lookup
6298
6299 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6300 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6301 #define elf_backend_check_relocs elf_x86_64_check_relocs
6302 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6303 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6304 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6305 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6306 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6307 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6308 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6309 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6310 #ifdef CORE_HEADER
6311 #define elf_backend_write_core_note elf_x86_64_write_core_note
6312 #endif
6313 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6314 #define elf_backend_relocate_section elf_x86_64_relocate_section
6315 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6316 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6317 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6318 #define elf_backend_object_p elf64_x86_64_elf_object_p
6319 #define bfd_elf64_mkobject elf_x86_64_mkobject
6320 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6321
6322 #define elf_backend_section_from_shdr \
6323 elf_x86_64_section_from_shdr
6324
6325 #define elf_backend_section_from_bfd_section \
6326 elf_x86_64_elf_section_from_bfd_section
6327 #define elf_backend_add_symbol_hook \
6328 elf_x86_64_add_symbol_hook
6329 #define elf_backend_symbol_processing \
6330 elf_x86_64_symbol_processing
6331 #define elf_backend_common_section_index \
6332 elf_x86_64_common_section_index
6333 #define elf_backend_common_section \
6334 elf_x86_64_common_section
6335 #define elf_backend_common_definition \
6336 elf_x86_64_common_definition
6337 #define elf_backend_merge_symbol \
6338 elf_x86_64_merge_symbol
6339 #define elf_backend_special_sections \
6340 elf_x86_64_special_sections
6341 #define elf_backend_additional_program_headers \
6342 elf_x86_64_additional_program_headers
6343 #define elf_backend_hash_symbol \
6344 elf_x86_64_hash_symbol
6345
6346 #include "elf64-target.h"
6347
6348 /* CloudABI support. */
6349
6350 #undef TARGET_LITTLE_SYM
6351 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6352 #undef TARGET_LITTLE_NAME
6353 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6354
6355 #undef ELF_OSABI
6356 #define ELF_OSABI ELFOSABI_CLOUDABI
6357
6358 #undef elf64_bed
6359 #define elf64_bed elf64_x86_64_cloudabi_bed
6360
6361 #include "elf64-target.h"
6362
6363 /* FreeBSD support. */
6364
6365 #undef TARGET_LITTLE_SYM
6366 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6367 #undef TARGET_LITTLE_NAME
6368 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6369
6370 #undef ELF_OSABI
6371 #define ELF_OSABI ELFOSABI_FREEBSD
6372
6373 #undef elf64_bed
6374 #define elf64_bed elf64_x86_64_fbsd_bed
6375
6376 #include "elf64-target.h"
6377
6378 /* Solaris 2 support. */
6379
6380 #undef TARGET_LITTLE_SYM
6381 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6382 #undef TARGET_LITTLE_NAME
6383 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6384
6385 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6386 objects won't be recognized. */
6387 #undef ELF_OSABI
6388
6389 #undef elf64_bed
6390 #define elf64_bed elf64_x86_64_sol2_bed
6391
6392 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6393 boundary. */
6394 #undef elf_backend_static_tls_alignment
6395 #define elf_backend_static_tls_alignment 16
6396
6397 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6398
6399 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6400 File, p.63. */
6401 #undef elf_backend_want_plt_sym
6402 #define elf_backend_want_plt_sym 1
6403
6404 #include "elf64-target.h"
6405
6406 /* Native Client support. */
6407
6408 static bfd_boolean
6409 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
6410 {
6411 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6412 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
6413 return TRUE;
6414 }
6415
6416 #undef TARGET_LITTLE_SYM
6417 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6418 #undef TARGET_LITTLE_NAME
6419 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6420 #undef elf64_bed
6421 #define elf64_bed elf64_x86_64_nacl_bed
6422
6423 #undef ELF_MAXPAGESIZE
6424 #undef ELF_MINPAGESIZE
6425 #undef ELF_COMMONPAGESIZE
6426 #define ELF_MAXPAGESIZE 0x10000
6427 #define ELF_MINPAGESIZE 0x10000
6428 #define ELF_COMMONPAGESIZE 0x10000
6429
6430 /* Restore defaults. */
6431 #undef ELF_OSABI
6432 #undef elf_backend_static_tls_alignment
6433 #undef elf_backend_want_plt_sym
6434 #define elf_backend_want_plt_sym 0
6435
6436 /* NaCl uses substantially different PLT entries for the same effects. */
6437
6438 #undef elf_backend_plt_alignment
6439 #define elf_backend_plt_alignment 5
6440 #define NACL_PLT_ENTRY_SIZE 64
6441 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6442
6443 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
6444 {
6445 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6446 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6447 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6448 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6449 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6450
6451 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6452 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6453
6454 /* 32 bytes of nop to pad out to the standard size. */
6455 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6456 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6457 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6458 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6459 0x66, /* excess data32 prefix */
6460 0x90 /* nop */
6461 };
6462
6463 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6464 {
6465 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6466 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6467 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6468 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6469
6470 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6471 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6472 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6473
6474 /* Lazy GOT entries point here (32-byte aligned). */
6475 0x68, /* pushq immediate */
6476 0, 0, 0, 0, /* replaced with index into relocation table. */
6477 0xe9, /* jmp relative */
6478 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6479
6480 /* 22 bytes of nop to pad out to the standard size. */
6481 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6482 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6483 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6484 };
6485
6486 /* .eh_frame covering the .plt section. */
6487
6488 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
6489 {
6490 #if (PLT_CIE_LENGTH != 20 \
6491 || PLT_FDE_LENGTH != 36 \
6492 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6493 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6494 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6495 #endif
6496 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6497 0, 0, 0, 0, /* CIE ID */
6498 1, /* CIE version */
6499 'z', 'R', 0, /* Augmentation string */
6500 1, /* Code alignment factor */
6501 0x78, /* Data alignment factor */
6502 16, /* Return address column */
6503 1, /* Augmentation size */
6504 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6505 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6506 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6507 DW_CFA_nop, DW_CFA_nop,
6508
6509 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6510 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
6511 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6512 0, 0, 0, 0, /* .plt size goes here */
6513 0, /* Augmentation size */
6514 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
6515 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6516 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
6517 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6518 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6519 13, /* Block length */
6520 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
6521 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
6522 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6523 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
6524 DW_CFA_nop, DW_CFA_nop
6525 };
6526
6527 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
6528 {
6529 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
6530 elf_x86_64_nacl_plt_entry, /* plt_entry */
6531 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6532 2, /* plt0_got1_offset */
6533 9, /* plt0_got2_offset */
6534 13, /* plt0_got2_insn_end */
6535 3, /* plt_got_offset */
6536 33, /* plt_reloc_offset */
6537 38, /* plt_plt_offset */
6538 7, /* plt_got_insn_size */
6539 42, /* plt_plt_insn_end */
6540 32, /* plt_lazy_offset */
6541 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
6542 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
6543 };
6544
6545 #undef elf_backend_arch_data
6546 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6547
6548 #undef elf_backend_object_p
6549 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6550 #undef elf_backend_modify_segment_map
6551 #define elf_backend_modify_segment_map nacl_modify_segment_map
6552 #undef elf_backend_modify_program_headers
6553 #define elf_backend_modify_program_headers nacl_modify_program_headers
6554 #undef elf_backend_final_write_processing
6555 #define elf_backend_final_write_processing nacl_final_write_processing
6556
6557 #include "elf64-target.h"
6558
6559 /* Native Client x32 support. */
6560
6561 static bfd_boolean
6562 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
6563 {
6564 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6565 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
6566 return TRUE;
6567 }
6568
6569 #undef TARGET_LITTLE_SYM
6570 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6571 #undef TARGET_LITTLE_NAME
6572 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6573 #undef elf32_bed
6574 #define elf32_bed elf32_x86_64_nacl_bed
6575
6576 #define bfd_elf32_bfd_link_hash_table_create \
6577 elf_x86_64_link_hash_table_create
6578 #define bfd_elf32_bfd_reloc_type_lookup \
6579 elf_x86_64_reloc_type_lookup
6580 #define bfd_elf32_bfd_reloc_name_lookup \
6581 elf_x86_64_reloc_name_lookup
6582 #define bfd_elf32_mkobject \
6583 elf_x86_64_mkobject
6584 #define bfd_elf32_get_synthetic_symtab \
6585 elf_x86_64_get_synthetic_symtab
6586
6587 #undef elf_backend_object_p
6588 #define elf_backend_object_p \
6589 elf32_x86_64_nacl_elf_object_p
6590
6591 #undef elf_backend_bfd_from_remote_memory
6592 #define elf_backend_bfd_from_remote_memory \
6593 _bfd_elf32_bfd_from_remote_memory
6594
6595 #undef elf_backend_size_info
6596 #define elf_backend_size_info \
6597 _bfd_elf32_size_info
6598
6599 #include "elf32-target.h"
6600
6601 /* Restore defaults. */
6602 #undef elf_backend_object_p
6603 #define elf_backend_object_p elf64_x86_64_elf_object_p
6604 #undef elf_backend_bfd_from_remote_memory
6605 #undef elf_backend_size_info
6606 #undef elf_backend_modify_segment_map
6607 #undef elf_backend_modify_program_headers
6608 #undef elf_backend_final_write_processing
6609
6610 /* Intel L1OM support. */
6611
6612 static bfd_boolean
6613 elf64_l1om_elf_object_p (bfd *abfd)
6614 {
6615 /* Set the right machine number for an L1OM elf64 file. */
6616 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
6617 return TRUE;
6618 }
6619
6620 #undef TARGET_LITTLE_SYM
6621 #define TARGET_LITTLE_SYM l1om_elf64_vec
6622 #undef TARGET_LITTLE_NAME
6623 #define TARGET_LITTLE_NAME "elf64-l1om"
6624 #undef ELF_ARCH
6625 #define ELF_ARCH bfd_arch_l1om
6626
6627 #undef ELF_MACHINE_CODE
6628 #define ELF_MACHINE_CODE EM_L1OM
6629
6630 #undef ELF_OSABI
6631
6632 #undef elf64_bed
6633 #define elf64_bed elf64_l1om_bed
6634
6635 #undef elf_backend_object_p
6636 #define elf_backend_object_p elf64_l1om_elf_object_p
6637
6638 /* Restore defaults. */
6639 #undef ELF_MAXPAGESIZE
6640 #undef ELF_MINPAGESIZE
6641 #undef ELF_COMMONPAGESIZE
6642 #define ELF_MAXPAGESIZE 0x200000
6643 #define ELF_MINPAGESIZE 0x1000
6644 #define ELF_COMMONPAGESIZE 0x1000
6645 #undef elf_backend_plt_alignment
6646 #define elf_backend_plt_alignment 4
6647 #undef elf_backend_arch_data
6648 #define elf_backend_arch_data &elf_x86_64_arch_bed
6649
6650 #include "elf64-target.h"
6651
6652 /* FreeBSD L1OM support. */
6653
6654 #undef TARGET_LITTLE_SYM
6655 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6656 #undef TARGET_LITTLE_NAME
6657 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6658
6659 #undef ELF_OSABI
6660 #define ELF_OSABI ELFOSABI_FREEBSD
6661
6662 #undef elf64_bed
6663 #define elf64_bed elf64_l1om_fbsd_bed
6664
6665 #include "elf64-target.h"
6666
6667 /* Intel K1OM support. */
6668
6669 static bfd_boolean
6670 elf64_k1om_elf_object_p (bfd *abfd)
6671 {
6672 /* Set the right machine number for an K1OM elf64 file. */
6673 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
6674 return TRUE;
6675 }
6676
6677 #undef TARGET_LITTLE_SYM
6678 #define TARGET_LITTLE_SYM k1om_elf64_vec
6679 #undef TARGET_LITTLE_NAME
6680 #define TARGET_LITTLE_NAME "elf64-k1om"
6681 #undef ELF_ARCH
6682 #define ELF_ARCH bfd_arch_k1om
6683
6684 #undef ELF_MACHINE_CODE
6685 #define ELF_MACHINE_CODE EM_K1OM
6686
6687 #undef ELF_OSABI
6688
6689 #undef elf64_bed
6690 #define elf64_bed elf64_k1om_bed
6691
6692 #undef elf_backend_object_p
6693 #define elf_backend_object_p elf64_k1om_elf_object_p
6694
6695 #undef elf_backend_static_tls_alignment
6696
6697 #undef elf_backend_want_plt_sym
6698 #define elf_backend_want_plt_sym 0
6699
6700 #include "elf64-target.h"
6701
6702 /* FreeBSD K1OM support. */
6703
6704 #undef TARGET_LITTLE_SYM
6705 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6706 #undef TARGET_LITTLE_NAME
6707 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6708
6709 #undef ELF_OSABI
6710 #define ELF_OSABI ELFOSABI_FREEBSD
6711
6712 #undef elf64_bed
6713 #define elf64_bed elf64_k1om_fbsd_bed
6714
6715 #include "elf64-target.h"
6716
6717 /* 32bit x86-64 support. */
6718
6719 #undef TARGET_LITTLE_SYM
6720 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6721 #undef TARGET_LITTLE_NAME
6722 #define TARGET_LITTLE_NAME "elf32-x86-64"
6723 #undef elf32_bed
6724
6725 #undef ELF_ARCH
6726 #define ELF_ARCH bfd_arch_i386
6727
6728 #undef ELF_MACHINE_CODE
6729 #define ELF_MACHINE_CODE EM_X86_64
6730
6731 #undef ELF_OSABI
6732
6733 #undef elf_backend_object_p
6734 #define elf_backend_object_p \
6735 elf32_x86_64_elf_object_p
6736
6737 #undef elf_backend_bfd_from_remote_memory
6738 #define elf_backend_bfd_from_remote_memory \
6739 _bfd_elf32_bfd_from_remote_memory
6740
6741 #undef elf_backend_size_info
6742 #define elf_backend_size_info \
6743 _bfd_elf32_size_info
6744
6745 #include "elf32-target.h"