e0e6c16fcd32b077228851597d087b98d053d9f0
[deliverable/binutils-gdb.git] / bfd / elf64-x86-64.c
1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2017 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf-nacl.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32 #include "libiberty.h"
33
34 #include "opcode/i386.h"
35 #include "elf/x86-64.h"
36
37 #ifdef CORE_HEADER
38 #include <stdarg.h>
39 #include CORE_HEADER
40 #endif
41
42 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
43 #define MINUS_ONE (~ (bfd_vma) 0)
44
45 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
46 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
47 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
48 since they are the same. */
49
50 #define ABI_64_P(abfd) \
51 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
52
53 /* The relocation "howto" table. Order of fields:
54 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
55 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
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 /* xgettext:c-format */
289 _bfd_error_handler (_("%B: invalid relocation type %d"),
290 abfd, (int) r_type);
291 r_type = R_X86_64_NONE;
292 }
293 i = r_type;
294 }
295 else
296 i = r_type - (unsigned int) R_X86_64_vt_offset;
297 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
298 return &x86_64_elf_howto_table[i];
299 }
300
301 /* Given a BFD reloc type, return a HOWTO structure. */
302 static reloc_howto_type *
303 elf_x86_64_reloc_type_lookup (bfd *abfd,
304 bfd_reloc_code_real_type code)
305 {
306 unsigned int i;
307
308 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
309 i++)
310 {
311 if (x86_64_reloc_map[i].bfd_reloc_val == code)
312 return elf_x86_64_rtype_to_howto (abfd,
313 x86_64_reloc_map[i].elf_reloc_val);
314 }
315 return NULL;
316 }
317
318 static reloc_howto_type *
319 elf_x86_64_reloc_name_lookup (bfd *abfd,
320 const char *r_name)
321 {
322 unsigned int i;
323
324 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
325 {
326 /* Get x32 R_X86_64_32. */
327 reloc_howto_type *reloc
328 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
329 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
330 return reloc;
331 }
332
333 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
334 if (x86_64_elf_howto_table[i].name != NULL
335 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
336 return &x86_64_elf_howto_table[i];
337
338 return NULL;
339 }
340
341 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
342
343 static void
344 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
345 Elf_Internal_Rela *dst)
346 {
347 unsigned r_type;
348
349 r_type = ELF32_R_TYPE (dst->r_info);
350 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
351 BFD_ASSERT (r_type == cache_ptr->howto->type);
352 }
353 \f
354 /* Support for core dump NOTE sections. */
355 static bfd_boolean
356 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
357 {
358 int offset;
359 size_t size;
360
361 switch (note->descsz)
362 {
363 default:
364 return FALSE;
365
366 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
367 /* pr_cursig */
368 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
369
370 /* pr_pid */
371 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
372
373 /* pr_reg */
374 offset = 72;
375 size = 216;
376
377 break;
378
379 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
380 /* pr_cursig */
381 elf_tdata (abfd)->core->signal
382 = bfd_get_16 (abfd, note->descdata + 12);
383
384 /* pr_pid */
385 elf_tdata (abfd)->core->lwpid
386 = bfd_get_32 (abfd, note->descdata + 32);
387
388 /* pr_reg */
389 offset = 112;
390 size = 216;
391
392 break;
393 }
394
395 /* Make a ".reg/999" section. */
396 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
397 size, note->descpos + offset);
398 }
399
400 static bfd_boolean
401 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
402 {
403 switch (note->descsz)
404 {
405 default:
406 return FALSE;
407
408 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
409 elf_tdata (abfd)->core->pid
410 = bfd_get_32 (abfd, note->descdata + 12);
411 elf_tdata (abfd)->core->program
412 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
413 elf_tdata (abfd)->core->command
414 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
415 break;
416
417 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
418 elf_tdata (abfd)->core->pid
419 = bfd_get_32 (abfd, note->descdata + 24);
420 elf_tdata (abfd)->core->program
421 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
422 elf_tdata (abfd)->core->command
423 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
424 }
425
426 /* Note that for some reason, a spurious space is tacked
427 onto the end of the args in some (at least one anyway)
428 implementations, so strip it off if it exists. */
429
430 {
431 char *command = elf_tdata (abfd)->core->command;
432 int n = strlen (command);
433
434 if (0 < n && command[n - 1] == ' ')
435 command[n - 1] = '\0';
436 }
437
438 return TRUE;
439 }
440
441 #ifdef CORE_HEADER
442 static char *
443 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
444 int note_type, ...)
445 {
446 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
447 va_list ap;
448 const char *fname, *psargs;
449 long pid;
450 int cursig;
451 const void *gregs;
452
453 switch (note_type)
454 {
455 default:
456 return NULL;
457
458 case NT_PRPSINFO:
459 va_start (ap, note_type);
460 fname = va_arg (ap, const char *);
461 psargs = va_arg (ap, const char *);
462 va_end (ap);
463
464 if (bed->s->elfclass == ELFCLASS32)
465 {
466 prpsinfo32_t data;
467 memset (&data, 0, sizeof (data));
468 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
469 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
470 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
471 &data, sizeof (data));
472 }
473 else
474 {
475 prpsinfo64_t data;
476 memset (&data, 0, sizeof (data));
477 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
478 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
479 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
480 &data, sizeof (data));
481 }
482 /* NOTREACHED */
483
484 case NT_PRSTATUS:
485 va_start (ap, note_type);
486 pid = va_arg (ap, long);
487 cursig = va_arg (ap, int);
488 gregs = va_arg (ap, const void *);
489 va_end (ap);
490
491 if (bed->s->elfclass == ELFCLASS32)
492 {
493 if (bed->elf_machine_code == EM_X86_64)
494 {
495 prstatusx32_t prstat;
496 memset (&prstat, 0, sizeof (prstat));
497 prstat.pr_pid = pid;
498 prstat.pr_cursig = cursig;
499 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
500 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
501 &prstat, sizeof (prstat));
502 }
503 else
504 {
505 prstatus32_t prstat;
506 memset (&prstat, 0, sizeof (prstat));
507 prstat.pr_pid = pid;
508 prstat.pr_cursig = cursig;
509 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
510 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
511 &prstat, sizeof (prstat));
512 }
513 }
514 else
515 {
516 prstatus64_t prstat;
517 memset (&prstat, 0, sizeof (prstat));
518 prstat.pr_pid = pid;
519 prstat.pr_cursig = cursig;
520 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
521 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
522 &prstat, sizeof (prstat));
523 }
524 }
525 /* NOTREACHED */
526 }
527 #endif
528 \f
529 /* Functions for the x86-64 ELF linker. */
530
531 /* The name of the dynamic interpreter. This is put in the .interp
532 section. */
533
534 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
535 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
536
537 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
540 shared lib. */
541 #define ELIMINATE_COPY_RELOCS 1
542
543 /* The size in bytes of an entry in the global offset table. */
544
545 #define GOT_ENTRY_SIZE 8
546
547 /* The size in bytes of an entry in the procedure linkage table. */
548
549 #define PLT_ENTRY_SIZE 16
550
551 /* The first entry in a procedure linkage table looks like this. See the
552 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
553
554 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
555 {
556 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
557 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
558 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
559 };
560
561 /* Subsequent entries in a procedure linkage table look like this. */
562
563 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
564 {
565 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
566 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
567 0x68, /* pushq immediate */
568 0, 0, 0, 0, /* replaced with index into relocation table. */
569 0xe9, /* jmp relative */
570 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
571 };
572
573 /* The first entry in a procedure linkage table with BND relocations
574 like this. */
575
576 static const bfd_byte elf_x86_64_bnd_plt0_entry[PLT_ENTRY_SIZE] =
577 {
578 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
579 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
580 0x0f, 0x1f, 0 /* nopl (%rax) */
581 };
582
583 /* Subsequent entries for legacy branches in a procedure linkage table
584 with BND relocations look like this. */
585
586 static const bfd_byte elf_x86_64_legacy_plt_entry[PLT_ENTRY_SIZE] =
587 {
588 0x68, 0, 0, 0, 0, /* pushq immediate */
589 0xe9, 0, 0, 0, 0, /* jmpq relative */
590 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
591 };
592
593 /* Subsequent entries for branches with BND prefx in a procedure linkage
594 table with BND relocations look like this. */
595
596 static const bfd_byte elf_x86_64_bnd_plt_entry[PLT_ENTRY_SIZE] =
597 {
598 0x68, 0, 0, 0, 0, /* pushq immediate */
599 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
600 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
601 };
602
603 /* Entries for legacy branches in the second procedure linkage table
604 look like this. */
605
606 static const bfd_byte elf_x86_64_legacy_plt2_entry[8] =
607 {
608 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
609 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
610 0x66, 0x90 /* xchg %ax,%ax */
611 };
612
613 /* Entries for branches with BND prefix in the second procedure linkage
614 table look like this. */
615
616 static const bfd_byte elf_x86_64_bnd_plt2_entry[8] =
617 {
618 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
619 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
620 0x90 /* nop */
621 };
622
623 /* .eh_frame covering the .plt section. */
624
625 static const bfd_byte elf_x86_64_eh_frame_plt[] =
626 {
627 #define PLT_CIE_LENGTH 20
628 #define PLT_FDE_LENGTH 36
629 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
630 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
631 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
632 0, 0, 0, 0, /* CIE ID */
633 1, /* CIE version */
634 'z', 'R', 0, /* Augmentation string */
635 1, /* Code alignment factor */
636 0x78, /* Data alignment factor */
637 16, /* Return address column */
638 1, /* Augmentation size */
639 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
640 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
641 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
642 DW_CFA_nop, DW_CFA_nop,
643
644 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
645 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
646 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
647 0, 0, 0, 0, /* .plt size goes here */
648 0, /* Augmentation size */
649 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
650 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
651 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
652 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
653 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
654 11, /* Block length */
655 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
656 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
657 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
658 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
659 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
660 };
661
662 /* .eh_frame covering the BND .plt section. */
663
664 static const bfd_byte elf_x86_64_eh_frame_bnd_plt[] =
665 {
666 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
667 0, 0, 0, 0, /* CIE ID */
668 1, /* CIE version */
669 'z', 'R', 0, /* Augmentation string */
670 1, /* Code alignment factor */
671 0x78, /* Data alignment factor */
672 16, /* Return address column */
673 1, /* Augmentation size */
674 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
675 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
676 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
677 DW_CFA_nop, DW_CFA_nop,
678
679 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
680 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
681 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
682 0, 0, 0, 0, /* .plt size goes here */
683 0, /* Augmentation size */
684 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
685 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
686 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
687 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
688 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
689 11, /* Block length */
690 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
691 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
692 DW_OP_lit15, DW_OP_and, DW_OP_lit5, DW_OP_ge,
693 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
694 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
695 };
696
697 /* .eh_frame covering the .plt.got section. */
698
699 static const bfd_byte elf_x86_64_eh_frame_plt_got[] =
700 {
701 #define PLT_GOT_FDE_LENGTH 20
702 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
703 0, 0, 0, 0, /* CIE ID */
704 1, /* CIE version */
705 'z', 'R', 0, /* Augmentation string */
706 1, /* Code alignment factor */
707 0x78, /* Data alignment factor */
708 16, /* Return address column */
709 1, /* Augmentation size */
710 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
711 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
712 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
713 DW_CFA_nop, DW_CFA_nop,
714
715 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
716 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
717 0, 0, 0, 0, /* the start of .plt.got goes here */
718 0, 0, 0, 0, /* .plt.got size goes here */
719 0, /* Augmentation size */
720 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop,
721 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
722 };
723
724 /* Architecture-specific backend data for x86-64. */
725
726 struct elf_x86_64_backend_data
727 {
728 /* Templates for the initial PLT entry and for subsequent entries. */
729 const bfd_byte *plt0_entry;
730 const bfd_byte *plt_entry;
731 unsigned int plt_entry_size; /* Size of each PLT entry. */
732
733 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
734 unsigned int plt0_got1_offset;
735 unsigned int plt0_got2_offset;
736
737 /* Offset of the end of the PC-relative instruction containing
738 plt0_got2_offset. */
739 unsigned int plt0_got2_insn_end;
740
741 /* Offsets into plt_entry that are to be replaced with... */
742 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
743 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
744 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
745
746 /* Length of the PC-relative instruction containing plt_got_offset. */
747 unsigned int plt_got_insn_size;
748
749 /* Offset of the end of the PC-relative jump to plt0_entry. */
750 unsigned int plt_plt_insn_end;
751
752 /* Offset into plt_entry where the initial value of the GOT entry points. */
753 unsigned int plt_lazy_offset;
754
755 /* .eh_frame covering the .plt section. */
756 const bfd_byte *eh_frame_plt;
757 unsigned int eh_frame_plt_size;
758
759 /* .eh_frame covering the .plt.got section. */
760 const bfd_byte *eh_frame_plt_got;
761 unsigned int eh_frame_plt_got_size;
762 };
763
764 #define get_elf_x86_64_arch_data(bed) \
765 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
766
767 #define get_elf_x86_64_backend_data(abfd) \
768 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
769
770 #define GET_PLT_ENTRY_SIZE(abfd) \
771 get_elf_x86_64_backend_data (abfd)->plt_entry_size
772
773 /* These are the standard parameters. */
774 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
775 {
776 elf_x86_64_plt0_entry, /* plt0_entry */
777 elf_x86_64_plt_entry, /* plt_entry */
778 sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
779 2, /* plt0_got1_offset */
780 8, /* plt0_got2_offset */
781 12, /* plt0_got2_insn_end */
782 2, /* plt_got_offset */
783 7, /* plt_reloc_offset */
784 12, /* plt_plt_offset */
785 6, /* plt_got_insn_size */
786 PLT_ENTRY_SIZE, /* plt_plt_insn_end */
787 6, /* plt_lazy_offset */
788 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
789 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
790 elf_x86_64_eh_frame_plt_got, /* eh_frame_plt_got */
791 sizeof (elf_x86_64_eh_frame_plt_got), /* eh_frame_plt_got_size */
792 };
793
794 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed =
795 {
796 elf_x86_64_bnd_plt0_entry, /* plt0_entry */
797 elf_x86_64_bnd_plt_entry, /* plt_entry */
798 sizeof (elf_x86_64_bnd_plt_entry), /* plt_entry_size */
799 2, /* plt0_got1_offset */
800 1+8, /* plt0_got2_offset */
801 1+12, /* plt0_got2_insn_end */
802 1+2, /* plt_got_offset */
803 1, /* plt_reloc_offset */
804 7, /* plt_plt_offset */
805 1+6, /* plt_got_insn_size */
806 11, /* plt_plt_insn_end */
807 0, /* plt_lazy_offset */
808 elf_x86_64_eh_frame_bnd_plt, /* eh_frame_plt */
809 sizeof (elf_x86_64_eh_frame_bnd_plt), /* eh_frame_plt_size */
810 elf_x86_64_eh_frame_plt_got, /* eh_frame_plt_got */
811 sizeof (elf_x86_64_eh_frame_plt_got), /* eh_frame_plt_got_size */
812 };
813
814 #define elf_backend_arch_data &elf_x86_64_arch_bed
815
816 /* Is a undefined weak symbol which is resolved to 0. Reference to an
817 undefined weak symbol is resolved to 0 when building executable if
818 it isn't dynamic and
819 1. Has non-GOT/non-PLT relocations in text section. Or
820 2. Has no GOT/PLT relocation.
821 */
822 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
823 ((EH)->elf.root.type == bfd_link_hash_undefweak \
824 && bfd_link_executable (INFO) \
825 && (elf_x86_64_hash_table (INFO)->interp == NULL \
826 || !(GOT_RELOC) \
827 || (EH)->has_non_got_reloc \
828 || !(INFO)->dynamic_undefined_weak))
829
830 /* x86-64 ELF linker hash entry. */
831
832 struct elf_x86_64_link_hash_entry
833 {
834 struct elf_link_hash_entry elf;
835
836 /* Track dynamic relocs copied for this symbol. */
837 struct elf_dyn_relocs *dyn_relocs;
838
839 #define GOT_UNKNOWN 0
840 #define GOT_NORMAL 1
841 #define GOT_TLS_GD 2
842 #define GOT_TLS_IE 3
843 #define GOT_TLS_GDESC 4
844 #define GOT_TLS_GD_BOTH_P(type) \
845 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
846 #define GOT_TLS_GD_P(type) \
847 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
848 #define GOT_TLS_GDESC_P(type) \
849 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
850 #define GOT_TLS_GD_ANY_P(type) \
851 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
852 unsigned char tls_type;
853
854 /* TRUE if a weak symbol with a real definition needs a copy reloc.
855 When there is a weak symbol with a real definition, the processor
856 independent code will have arranged for us to see the real
857 definition first. We need to copy the needs_copy bit from the
858 real definition and check it when allowing copy reloc in PIE. */
859 unsigned int needs_copy : 1;
860
861 /* TRUE if symbol has at least one BND relocation. */
862 unsigned int has_bnd_reloc : 1;
863
864 /* TRUE if symbol has GOT or PLT relocations. */
865 unsigned int has_got_reloc : 1;
866
867 /* TRUE if symbol has non-GOT/non-PLT relocations in text sections. */
868 unsigned int has_non_got_reloc : 1;
869
870 /* 0: symbol isn't __tls_get_addr.
871 1: symbol is __tls_get_addr.
872 2: symbol is unknown. */
873 unsigned int tls_get_addr : 2;
874
875 /* Reference count of C/C++ function pointer relocations in read-write
876 section which can be resolved at run-time. */
877 bfd_signed_vma func_pointer_refcount;
878
879 /* Information about the GOT PLT entry. Filled when there are both
880 GOT and PLT relocations against the same function. */
881 union gotplt_union plt_got;
882
883 /* Information about the second PLT entry. Filled when has_bnd_reloc is
884 set. */
885 union gotplt_union plt_bnd;
886
887 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
888 starting at the end of the jump table. */
889 bfd_vma tlsdesc_got;
890 };
891
892 #define elf_x86_64_hash_entry(ent) \
893 ((struct elf_x86_64_link_hash_entry *)(ent))
894
895 struct elf_x86_64_obj_tdata
896 {
897 struct elf_obj_tdata root;
898
899 /* tls_type for each local got entry. */
900 char *local_got_tls_type;
901
902 /* GOTPLT entries for TLS descriptors. */
903 bfd_vma *local_tlsdesc_gotent;
904 };
905
906 #define elf_x86_64_tdata(abfd) \
907 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
908
909 #define elf_x86_64_local_got_tls_type(abfd) \
910 (elf_x86_64_tdata (abfd)->local_got_tls_type)
911
912 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
913 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
914
915 #define is_x86_64_elf(bfd) \
916 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
917 && elf_tdata (bfd) != NULL \
918 && elf_object_id (bfd) == X86_64_ELF_DATA)
919
920 static bfd_boolean
921 elf_x86_64_mkobject (bfd *abfd)
922 {
923 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
924 X86_64_ELF_DATA);
925 }
926
927 /* x86-64 ELF linker hash table. */
928
929 struct elf_x86_64_link_hash_table
930 {
931 struct elf_link_hash_table elf;
932
933 /* Short-cuts to get to dynamic linker sections. */
934 asection *interp;
935 asection *plt_eh_frame;
936 asection *plt_bnd;
937 asection *plt_bnd_eh_frame;
938 asection *plt_got;
939 asection *plt_got_eh_frame;
940
941 union
942 {
943 bfd_signed_vma refcount;
944 bfd_vma offset;
945 } tls_ld_got;
946
947 /* The amount of space used by the jump slots in the GOT. */
948 bfd_vma sgotplt_jump_table_size;
949
950 /* Small local sym cache. */
951 struct sym_cache sym_cache;
952
953 bfd_vma (*r_info) (bfd_vma, bfd_vma);
954 bfd_vma (*r_sym) (bfd_vma);
955 unsigned int pointer_r_type;
956 const char *dynamic_interpreter;
957 int dynamic_interpreter_size;
958
959 /* _TLS_MODULE_BASE_ symbol. */
960 struct bfd_link_hash_entry *tls_module_base;
961
962 /* Used by local STT_GNU_IFUNC symbols. */
963 htab_t loc_hash_table;
964 void * loc_hash_memory;
965
966 /* The offset into splt of the PLT entry for the TLS descriptor
967 resolver. Special values are 0, if not necessary (or not found
968 to be necessary yet), and -1 if needed but not determined
969 yet. */
970 bfd_vma tlsdesc_plt;
971 /* The offset into sgot of the GOT entry used by the PLT entry
972 above. */
973 bfd_vma tlsdesc_got;
974
975 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
976 bfd_vma next_jump_slot_index;
977 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
978 bfd_vma next_irelative_index;
979
980 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
981 to read-only sections. */
982 bfd_boolean readonly_dynrelocs_against_ifunc;
983 };
984
985 /* Get the x86-64 ELF linker hash table from a link_info structure. */
986
987 #define elf_x86_64_hash_table(p) \
988 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
989 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
990
991 #define elf_x86_64_compute_jump_table_size(htab) \
992 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
993
994 /* Create an entry in an x86-64 ELF linker hash table. */
995
996 static struct bfd_hash_entry *
997 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
998 struct bfd_hash_table *table,
999 const char *string)
1000 {
1001 /* Allocate the structure if it has not already been allocated by a
1002 subclass. */
1003 if (entry == NULL)
1004 {
1005 entry = (struct bfd_hash_entry *)
1006 bfd_hash_allocate (table,
1007 sizeof (struct elf_x86_64_link_hash_entry));
1008 if (entry == NULL)
1009 return entry;
1010 }
1011
1012 /* Call the allocation method of the superclass. */
1013 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
1014 if (entry != NULL)
1015 {
1016 struct elf_x86_64_link_hash_entry *eh;
1017
1018 eh = (struct elf_x86_64_link_hash_entry *) entry;
1019 eh->dyn_relocs = NULL;
1020 eh->tls_type = GOT_UNKNOWN;
1021 eh->needs_copy = 0;
1022 eh->has_bnd_reloc = 0;
1023 eh->has_got_reloc = 0;
1024 eh->has_non_got_reloc = 0;
1025 eh->tls_get_addr = 2;
1026 eh->func_pointer_refcount = 0;
1027 eh->plt_bnd.offset = (bfd_vma) -1;
1028 eh->plt_got.offset = (bfd_vma) -1;
1029 eh->tlsdesc_got = (bfd_vma) -1;
1030 }
1031
1032 return entry;
1033 }
1034
1035 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
1036 for local symbol so that we can handle local STT_GNU_IFUNC symbols
1037 as global symbol. We reuse indx and dynstr_index for local symbol
1038 hash since they aren't used by global symbols in this backend. */
1039
1040 static hashval_t
1041 elf_x86_64_local_htab_hash (const void *ptr)
1042 {
1043 struct elf_link_hash_entry *h
1044 = (struct elf_link_hash_entry *) ptr;
1045 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
1046 }
1047
1048 /* Compare local hash entries. */
1049
1050 static int
1051 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
1052 {
1053 struct elf_link_hash_entry *h1
1054 = (struct elf_link_hash_entry *) ptr1;
1055 struct elf_link_hash_entry *h2
1056 = (struct elf_link_hash_entry *) ptr2;
1057
1058 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
1059 }
1060
1061 /* Find and/or create a hash entry for local symbol. */
1062
1063 static struct elf_link_hash_entry *
1064 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
1065 bfd *abfd, const Elf_Internal_Rela *rel,
1066 bfd_boolean create)
1067 {
1068 struct elf_x86_64_link_hash_entry e, *ret;
1069 asection *sec = abfd->sections;
1070 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
1071 htab->r_sym (rel->r_info));
1072 void **slot;
1073
1074 e.elf.indx = sec->id;
1075 e.elf.dynstr_index = htab->r_sym (rel->r_info);
1076 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
1077 create ? INSERT : NO_INSERT);
1078
1079 if (!slot)
1080 return NULL;
1081
1082 if (*slot)
1083 {
1084 ret = (struct elf_x86_64_link_hash_entry *) *slot;
1085 return &ret->elf;
1086 }
1087
1088 ret = (struct elf_x86_64_link_hash_entry *)
1089 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
1090 sizeof (struct elf_x86_64_link_hash_entry));
1091 if (ret)
1092 {
1093 memset (ret, 0, sizeof (*ret));
1094 ret->elf.indx = sec->id;
1095 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
1096 ret->elf.dynindx = -1;
1097 ret->func_pointer_refcount = 0;
1098 ret->plt_got.offset = (bfd_vma) -1;
1099 *slot = ret;
1100 }
1101 return &ret->elf;
1102 }
1103
1104 /* Destroy an X86-64 ELF linker hash table. */
1105
1106 static void
1107 elf_x86_64_link_hash_table_free (bfd *obfd)
1108 {
1109 struct elf_x86_64_link_hash_table *htab
1110 = (struct elf_x86_64_link_hash_table *) obfd->link.hash;
1111
1112 if (htab->loc_hash_table)
1113 htab_delete (htab->loc_hash_table);
1114 if (htab->loc_hash_memory)
1115 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1116 _bfd_elf_link_hash_table_free (obfd);
1117 }
1118
1119 /* Create an X86-64 ELF linker hash table. */
1120
1121 static struct bfd_link_hash_table *
1122 elf_x86_64_link_hash_table_create (bfd *abfd)
1123 {
1124 struct elf_x86_64_link_hash_table *ret;
1125 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
1126
1127 ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt);
1128 if (ret == NULL)
1129 return NULL;
1130
1131 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1132 elf_x86_64_link_hash_newfunc,
1133 sizeof (struct elf_x86_64_link_hash_entry),
1134 X86_64_ELF_DATA))
1135 {
1136 free (ret);
1137 return NULL;
1138 }
1139
1140 if (ABI_64_P (abfd))
1141 {
1142 ret->r_info = elf64_r_info;
1143 ret->r_sym = elf64_r_sym;
1144 ret->pointer_r_type = R_X86_64_64;
1145 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
1146 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
1147 }
1148 else
1149 {
1150 ret->r_info = elf32_r_info;
1151 ret->r_sym = elf32_r_sym;
1152 ret->pointer_r_type = R_X86_64_32;
1153 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
1154 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
1155 }
1156
1157 ret->loc_hash_table = htab_try_create (1024,
1158 elf_x86_64_local_htab_hash,
1159 elf_x86_64_local_htab_eq,
1160 NULL);
1161 ret->loc_hash_memory = objalloc_create ();
1162 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1163 {
1164 elf_x86_64_link_hash_table_free (abfd);
1165 return NULL;
1166 }
1167 ret->elf.root.hash_table_free = elf_x86_64_link_hash_table_free;
1168
1169 return &ret->elf.root;
1170 }
1171
1172 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1173 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1174 hash table. */
1175
1176 static bfd_boolean
1177 elf_x86_64_create_dynamic_sections (bfd *dynobj,
1178 struct bfd_link_info *info)
1179 {
1180 struct elf_x86_64_link_hash_table *htab;
1181
1182 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1183 return FALSE;
1184
1185 htab = elf_x86_64_hash_table (info);
1186 if (htab == NULL)
1187 return FALSE;
1188
1189 /* Set the contents of the .interp section to the interpreter. */
1190 if (bfd_link_executable (info) && !info->nointerp)
1191 {
1192 asection *s = bfd_get_linker_section (dynobj, ".interp");
1193 if (s == NULL)
1194 abort ();
1195 s->size = htab->dynamic_interpreter_size;
1196 s->contents = (unsigned char *) htab->dynamic_interpreter;
1197 htab->interp = s;
1198 }
1199
1200 if (!info->no_ld_generated_unwind_info
1201 && htab->plt_eh_frame == NULL
1202 && htab->elf.splt != NULL)
1203 {
1204 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1205 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1206 | SEC_LINKER_CREATED);
1207 htab->plt_eh_frame
1208 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1209 if (htab->plt_eh_frame == NULL
1210 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame,
1211 ABI_64_P (dynobj) ? 3 : 2))
1212 return FALSE;
1213 }
1214
1215 /* Align .got section to its entry size. */
1216 if (htab->elf.sgot != NULL
1217 && !bfd_set_section_alignment (dynobj, htab->elf.sgot, 3))
1218 return FALSE;
1219
1220 /* Align .got.plt section to its entry size. */
1221 if (htab->elf.sgotplt != NULL
1222 && !bfd_set_section_alignment (dynobj, htab->elf.sgotplt, 3))
1223 return FALSE;
1224
1225 return TRUE;
1226 }
1227
1228 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1229
1230 static void
1231 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1232 struct elf_link_hash_entry *dir,
1233 struct elf_link_hash_entry *ind)
1234 {
1235 struct elf_x86_64_link_hash_entry *edir, *eind;
1236
1237 edir = (struct elf_x86_64_link_hash_entry *) dir;
1238 eind = (struct elf_x86_64_link_hash_entry *) ind;
1239
1240 edir->has_bnd_reloc |= eind->has_bnd_reloc;
1241 edir->has_got_reloc |= eind->has_got_reloc;
1242 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1243
1244 if (eind->dyn_relocs != NULL)
1245 {
1246 if (edir->dyn_relocs != NULL)
1247 {
1248 struct elf_dyn_relocs **pp;
1249 struct elf_dyn_relocs *p;
1250
1251 /* Add reloc counts against the indirect sym to the direct sym
1252 list. Merge any entries against the same section. */
1253 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1254 {
1255 struct elf_dyn_relocs *q;
1256
1257 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1258 if (q->sec == p->sec)
1259 {
1260 q->pc_count += p->pc_count;
1261 q->count += p->count;
1262 *pp = p->next;
1263 break;
1264 }
1265 if (q == NULL)
1266 pp = &p->next;
1267 }
1268 *pp = edir->dyn_relocs;
1269 }
1270
1271 edir->dyn_relocs = eind->dyn_relocs;
1272 eind->dyn_relocs = NULL;
1273 }
1274
1275 if (ind->root.type == bfd_link_hash_indirect
1276 && dir->got.refcount <= 0)
1277 {
1278 edir->tls_type = eind->tls_type;
1279 eind->tls_type = GOT_UNKNOWN;
1280 }
1281
1282 if (ELIMINATE_COPY_RELOCS
1283 && ind->root.type != bfd_link_hash_indirect
1284 && dir->dynamic_adjusted)
1285 {
1286 /* If called to transfer flags for a weakdef during processing
1287 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1288 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1289 if (dir->versioned != versioned_hidden)
1290 dir->ref_dynamic |= ind->ref_dynamic;
1291 dir->ref_regular |= ind->ref_regular;
1292 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1293 dir->needs_plt |= ind->needs_plt;
1294 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1295 }
1296 else
1297 {
1298 if (eind->func_pointer_refcount > 0)
1299 {
1300 edir->func_pointer_refcount += eind->func_pointer_refcount;
1301 eind->func_pointer_refcount = 0;
1302 }
1303
1304 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1305 }
1306 }
1307
1308 static bfd_boolean
1309 elf64_x86_64_elf_object_p (bfd *abfd)
1310 {
1311 /* Set the right machine number for an x86-64 elf64 file. */
1312 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1313 return TRUE;
1314 }
1315
1316 static bfd_boolean
1317 elf32_x86_64_elf_object_p (bfd *abfd)
1318 {
1319 /* Set the right machine number for an x86-64 elf32 file. */
1320 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1321 return TRUE;
1322 }
1323
1324 /* Return TRUE if the TLS access code sequence support transition
1325 from R_TYPE. */
1326
1327 static bfd_boolean
1328 elf_x86_64_check_tls_transition (bfd *abfd,
1329 struct bfd_link_info *info,
1330 asection *sec,
1331 bfd_byte *contents,
1332 Elf_Internal_Shdr *symtab_hdr,
1333 struct elf_link_hash_entry **sym_hashes,
1334 unsigned int r_type,
1335 const Elf_Internal_Rela *rel,
1336 const Elf_Internal_Rela *relend)
1337 {
1338 unsigned int val;
1339 unsigned long r_symndx;
1340 bfd_boolean largepic = FALSE;
1341 struct elf_link_hash_entry *h;
1342 bfd_vma offset;
1343 struct elf_x86_64_link_hash_table *htab;
1344 bfd_byte *call;
1345 bfd_boolean indirect_call, tls_get_addr;
1346
1347 htab = elf_x86_64_hash_table (info);
1348 offset = rel->r_offset;
1349 switch (r_type)
1350 {
1351 case R_X86_64_TLSGD:
1352 case R_X86_64_TLSLD:
1353 if ((rel + 1) >= relend)
1354 return FALSE;
1355
1356 if (r_type == R_X86_64_TLSGD)
1357 {
1358 /* Check transition from GD access model. For 64bit, only
1359 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1360 .word 0x6666; rex64; call __tls_get_addr@PLT
1361 or
1362 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1363 .byte 0x66; rex64
1364 call *__tls_get_addr@GOTPCREL(%rip)
1365 which may be converted to
1366 addr32 call __tls_get_addr
1367 can transit to different access model. For 32bit, only
1368 leaq foo@tlsgd(%rip), %rdi
1369 .word 0x6666; rex64; call __tls_get_addr@PLT
1370 or
1371 leaq foo@tlsgd(%rip), %rdi
1372 .byte 0x66; rex64
1373 call *__tls_get_addr@GOTPCREL(%rip)
1374 which may be converted to
1375 addr32 call __tls_get_addr
1376 can transit to different access model. For largepic,
1377 we also support:
1378 leaq foo@tlsgd(%rip), %rdi
1379 movabsq $__tls_get_addr@pltoff, %rax
1380 addq $r15, %rax
1381 call *%rax
1382 or
1383 leaq foo@tlsgd(%rip), %rdi
1384 movabsq $__tls_get_addr@pltoff, %rax
1385 addq $rbx, %rax
1386 call *%rax */
1387
1388 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1389
1390 if ((offset + 12) > sec->size)
1391 return FALSE;
1392
1393 call = contents + offset + 4;
1394 if (call[0] != 0x66
1395 || !((call[1] == 0x48
1396 && call[2] == 0xff
1397 && call[3] == 0x15)
1398 || (call[1] == 0x48
1399 && call[2] == 0x67
1400 && call[3] == 0xe8)
1401 || (call[1] == 0x66
1402 && call[2] == 0x48
1403 && call[3] == 0xe8)))
1404 {
1405 if (!ABI_64_P (abfd)
1406 || (offset + 19) > sec->size
1407 || offset < 3
1408 || memcmp (call - 7, leaq + 1, 3) != 0
1409 || memcmp (call, "\x48\xb8", 2) != 0
1410 || call[11] != 0x01
1411 || call[13] != 0xff
1412 || call[14] != 0xd0
1413 || !((call[10] == 0x48 && call[12] == 0xd8)
1414 || (call[10] == 0x4c && call[12] == 0xf8)))
1415 return FALSE;
1416 largepic = TRUE;
1417 }
1418 else if (ABI_64_P (abfd))
1419 {
1420 if (offset < 4
1421 || memcmp (contents + offset - 4, leaq, 4) != 0)
1422 return FALSE;
1423 }
1424 else
1425 {
1426 if (offset < 3
1427 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1428 return FALSE;
1429 }
1430 indirect_call = call[2] == 0xff;
1431 }
1432 else
1433 {
1434 /* Check transition from LD access model. Only
1435 leaq foo@tlsld(%rip), %rdi;
1436 call __tls_get_addr@PLT
1437 or
1438 leaq foo@tlsld(%rip), %rdi;
1439 call *__tls_get_addr@GOTPCREL(%rip)
1440 which may be converted to
1441 addr32 call __tls_get_addr
1442 can transit to different access model. For largepic
1443 we also support:
1444 leaq foo@tlsld(%rip), %rdi
1445 movabsq $__tls_get_addr@pltoff, %rax
1446 addq $r15, %rax
1447 call *%rax
1448 or
1449 leaq foo@tlsld(%rip), %rdi
1450 movabsq $__tls_get_addr@pltoff, %rax
1451 addq $rbx, %rax
1452 call *%rax */
1453
1454 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1455
1456 if (offset < 3 || (offset + 9) > sec->size)
1457 return FALSE;
1458
1459 if (memcmp (contents + offset - 3, lea, 3) != 0)
1460 return FALSE;
1461
1462 call = contents + offset + 4;
1463 if (!(call[0] == 0xe8
1464 || (call[0] == 0xff && call[1] == 0x15)
1465 || (call[0] == 0x67 && call[1] == 0xe8)))
1466 {
1467 if (!ABI_64_P (abfd)
1468 || (offset + 19) > sec->size
1469 || memcmp (call, "\x48\xb8", 2) != 0
1470 || call[11] != 0x01
1471 || call[13] != 0xff
1472 || call[14] != 0xd0
1473 || !((call[10] == 0x48 && call[12] == 0xd8)
1474 || (call[10] == 0x4c && call[12] == 0xf8)))
1475 return FALSE;
1476 largepic = TRUE;
1477 }
1478 indirect_call = call[0] == 0xff;
1479 }
1480
1481 r_symndx = htab->r_sym (rel[1].r_info);
1482 if (r_symndx < symtab_hdr->sh_info)
1483 return FALSE;
1484
1485 tls_get_addr = FALSE;
1486 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1487 if (h != NULL && h->root.root.string != NULL)
1488 {
1489 struct elf_x86_64_link_hash_entry *eh
1490 = (struct elf_x86_64_link_hash_entry *) h;
1491 tls_get_addr = eh->tls_get_addr == 1;
1492 if (eh->tls_get_addr > 1)
1493 {
1494 /* Use strncmp to check __tls_get_addr since
1495 __tls_get_addr may be versioned. */
1496 if (strncmp (h->root.root.string, "__tls_get_addr", 14)
1497 == 0)
1498 {
1499 eh->tls_get_addr = 1;
1500 tls_get_addr = TRUE;
1501 }
1502 else
1503 eh->tls_get_addr = 0;
1504 }
1505 }
1506
1507 if (!tls_get_addr)
1508 return FALSE;
1509 else if (largepic)
1510 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64;
1511 else if (indirect_call)
1512 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_GOTPCRELX;
1513 else
1514 return (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1515 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
1516
1517 case R_X86_64_GOTTPOFF:
1518 /* Check transition from IE access model:
1519 mov foo@gottpoff(%rip), %reg
1520 add foo@gottpoff(%rip), %reg
1521 */
1522
1523 /* Check REX prefix first. */
1524 if (offset >= 3 && (offset + 4) <= sec->size)
1525 {
1526 val = bfd_get_8 (abfd, contents + offset - 3);
1527 if (val != 0x48 && val != 0x4c)
1528 {
1529 /* X32 may have 0x44 REX prefix or no REX prefix. */
1530 if (ABI_64_P (abfd))
1531 return FALSE;
1532 }
1533 }
1534 else
1535 {
1536 /* X32 may not have any REX prefix. */
1537 if (ABI_64_P (abfd))
1538 return FALSE;
1539 if (offset < 2 || (offset + 3) > sec->size)
1540 return FALSE;
1541 }
1542
1543 val = bfd_get_8 (abfd, contents + offset - 2);
1544 if (val != 0x8b && val != 0x03)
1545 return FALSE;
1546
1547 val = bfd_get_8 (abfd, contents + offset - 1);
1548 return (val & 0xc7) == 5;
1549
1550 case R_X86_64_GOTPC32_TLSDESC:
1551 /* Check transition from GDesc access model:
1552 leaq x@tlsdesc(%rip), %rax
1553
1554 Make sure it's a leaq adding rip to a 32-bit offset
1555 into any register, although it's probably almost always
1556 going to be rax. */
1557
1558 if (offset < 3 || (offset + 4) > sec->size)
1559 return FALSE;
1560
1561 val = bfd_get_8 (abfd, contents + offset - 3);
1562 if ((val & 0xfb) != 0x48)
1563 return FALSE;
1564
1565 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1566 return FALSE;
1567
1568 val = bfd_get_8 (abfd, contents + offset - 1);
1569 return (val & 0xc7) == 0x05;
1570
1571 case R_X86_64_TLSDESC_CALL:
1572 /* Check transition from GDesc access model:
1573 call *x@tlsdesc(%rax)
1574 */
1575 if (offset + 2 <= sec->size)
1576 {
1577 /* Make sure that it's a call *x@tlsdesc(%rax). */
1578 call = contents + offset;
1579 return call[0] == 0xff && call[1] == 0x10;
1580 }
1581
1582 return FALSE;
1583
1584 default:
1585 abort ();
1586 }
1587 }
1588
1589 /* Return TRUE if the TLS access transition is OK or no transition
1590 will be performed. Update R_TYPE if there is a transition. */
1591
1592 static bfd_boolean
1593 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1594 asection *sec, bfd_byte *contents,
1595 Elf_Internal_Shdr *symtab_hdr,
1596 struct elf_link_hash_entry **sym_hashes,
1597 unsigned int *r_type, int tls_type,
1598 const Elf_Internal_Rela *rel,
1599 const Elf_Internal_Rela *relend,
1600 struct elf_link_hash_entry *h,
1601 unsigned long r_symndx,
1602 bfd_boolean from_relocate_section)
1603 {
1604 unsigned int from_type = *r_type;
1605 unsigned int to_type = from_type;
1606 bfd_boolean check = TRUE;
1607
1608 /* Skip TLS transition for functions. */
1609 if (h != NULL
1610 && (h->type == STT_FUNC
1611 || h->type == STT_GNU_IFUNC))
1612 return TRUE;
1613
1614 switch (from_type)
1615 {
1616 case R_X86_64_TLSGD:
1617 case R_X86_64_GOTPC32_TLSDESC:
1618 case R_X86_64_TLSDESC_CALL:
1619 case R_X86_64_GOTTPOFF:
1620 if (bfd_link_executable (info))
1621 {
1622 if (h == NULL)
1623 to_type = R_X86_64_TPOFF32;
1624 else
1625 to_type = R_X86_64_GOTTPOFF;
1626 }
1627
1628 /* When we are called from elf_x86_64_relocate_section, there may
1629 be additional transitions based on TLS_TYPE. */
1630 if (from_relocate_section)
1631 {
1632 unsigned int new_to_type = to_type;
1633
1634 if (bfd_link_executable (info)
1635 && h != NULL
1636 && h->dynindx == -1
1637 && tls_type == GOT_TLS_IE)
1638 new_to_type = R_X86_64_TPOFF32;
1639
1640 if (to_type == R_X86_64_TLSGD
1641 || to_type == R_X86_64_GOTPC32_TLSDESC
1642 || to_type == R_X86_64_TLSDESC_CALL)
1643 {
1644 if (tls_type == GOT_TLS_IE)
1645 new_to_type = R_X86_64_GOTTPOFF;
1646 }
1647
1648 /* We checked the transition before when we were called from
1649 elf_x86_64_check_relocs. We only want to check the new
1650 transition which hasn't been checked before. */
1651 check = new_to_type != to_type && from_type == to_type;
1652 to_type = new_to_type;
1653 }
1654
1655 break;
1656
1657 case R_X86_64_TLSLD:
1658 if (bfd_link_executable (info))
1659 to_type = R_X86_64_TPOFF32;
1660 break;
1661
1662 default:
1663 return TRUE;
1664 }
1665
1666 /* Return TRUE if there is no transition. */
1667 if (from_type == to_type)
1668 return TRUE;
1669
1670 /* Check if the transition can be performed. */
1671 if (check
1672 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1673 symtab_hdr, sym_hashes,
1674 from_type, rel, relend))
1675 {
1676 reloc_howto_type *from, *to;
1677 const char *name;
1678
1679 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1680 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1681
1682 if (h)
1683 name = h->root.root.string;
1684 else
1685 {
1686 struct elf_x86_64_link_hash_table *htab;
1687
1688 htab = elf_x86_64_hash_table (info);
1689 if (htab == NULL)
1690 name = "*unknown*";
1691 else
1692 {
1693 Elf_Internal_Sym *isym;
1694
1695 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1696 abfd, r_symndx);
1697 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1698 }
1699 }
1700
1701 _bfd_error_handler
1702 /* xgettext:c-format */
1703 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1704 "in section `%A' failed"),
1705 abfd, sec, from->name, to->name, name,
1706 (unsigned long) rel->r_offset);
1707 bfd_set_error (bfd_error_bad_value);
1708 return FALSE;
1709 }
1710
1711 *r_type = to_type;
1712 return TRUE;
1713 }
1714
1715 /* Rename some of the generic section flags to better document how they
1716 are used here. */
1717 #define need_convert_load sec_flg0
1718 #define check_relocs_failed sec_flg1
1719
1720 static bfd_boolean
1721 elf_x86_64_need_pic (bfd *input_bfd, asection *sec,
1722 struct elf_link_hash_entry *h,
1723 Elf_Internal_Shdr *symtab_hdr,
1724 Elf_Internal_Sym *isym,
1725 reloc_howto_type *howto)
1726 {
1727 const char *v = "";
1728 const char *und = "";
1729 const char *pic = "";
1730
1731 const char *name;
1732 if (h)
1733 {
1734 name = h->root.root.string;
1735 switch (ELF_ST_VISIBILITY (h->other))
1736 {
1737 case STV_HIDDEN:
1738 v = _("hidden symbol ");
1739 break;
1740 case STV_INTERNAL:
1741 v = _("internal symbol ");
1742 break;
1743 case STV_PROTECTED:
1744 v = _("protected symbol ");
1745 break;
1746 default:
1747 v = _("symbol ");
1748 pic = _("; recompile with -fPIC");
1749 break;
1750 }
1751
1752 if (!h->def_regular && !h->def_dynamic)
1753 und = _("undefined ");
1754 }
1755 else
1756 {
1757 name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL);
1758 pic = _("; recompile with -fPIC");
1759 }
1760
1761 /* xgettext:c-format */
1762 _bfd_error_handler (_("%B: relocation %s against %s%s`%s' can "
1763 "not be used when making a shared object%s"),
1764 input_bfd, howto->name, und, v, name, pic);
1765 bfd_set_error (bfd_error_bad_value);
1766 sec->check_relocs_failed = 1;
1767 return FALSE;
1768 }
1769
1770 /* With the local symbol, foo, we convert
1771 mov foo@GOTPCREL(%rip), %reg
1772 to
1773 lea foo(%rip), %reg
1774 and convert
1775 call/jmp *foo@GOTPCREL(%rip)
1776 to
1777 nop call foo/jmp foo nop
1778 When PIC is false, convert
1779 test %reg, foo@GOTPCREL(%rip)
1780 to
1781 test $foo, %reg
1782 and convert
1783 binop foo@GOTPCREL(%rip), %reg
1784 to
1785 binop $foo, %reg
1786 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1787 instructions. */
1788
1789 static bfd_boolean
1790 elf_x86_64_convert_load_reloc (bfd *abfd, asection *sec,
1791 bfd_byte *contents,
1792 Elf_Internal_Rela *irel,
1793 struct elf_link_hash_entry *h,
1794 bfd_boolean *converted,
1795 struct bfd_link_info *link_info)
1796 {
1797 struct elf_x86_64_link_hash_table *htab;
1798 bfd_boolean is_pic;
1799 bfd_boolean require_reloc_pc32;
1800 bfd_boolean relocx;
1801 bfd_boolean to_reloc_pc32;
1802 asection *tsec;
1803 char symtype;
1804 bfd_signed_vma raddend;
1805 unsigned int opcode;
1806 unsigned int modrm;
1807 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
1808 unsigned int r_symndx;
1809 bfd_vma toff;
1810 bfd_vma roff = irel->r_offset;
1811
1812 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
1813 return TRUE;
1814
1815 raddend = irel->r_addend;
1816 /* Addend for 32-bit PC-relative relocation must be -4. */
1817 if (raddend != -4)
1818 return TRUE;
1819
1820 htab = elf_x86_64_hash_table (link_info);
1821 is_pic = bfd_link_pic (link_info);
1822
1823 relocx = (r_type == R_X86_64_GOTPCRELX
1824 || r_type == R_X86_64_REX_GOTPCRELX);
1825
1826 /* TRUE if we can convert only to R_X86_64_PC32. Enable it for
1827 --no-relax. */
1828 require_reloc_pc32
1829 = link_info->disable_target_specific_optimizations > 1;
1830
1831 r_symndx = htab->r_sym (irel->r_info);
1832
1833 opcode = bfd_get_8 (abfd, contents + roff - 2);
1834
1835 /* Convert mov to lea since it has been done for a while. */
1836 if (opcode != 0x8b)
1837 {
1838 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
1839 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
1840 test, xor instructions. */
1841 if (!relocx)
1842 return TRUE;
1843 }
1844
1845 /* We convert only to R_X86_64_PC32:
1846 1. Branch.
1847 2. R_X86_64_GOTPCREL since we can't modify REX byte.
1848 3. require_reloc_pc32 is true.
1849 4. PIC.
1850 */
1851 to_reloc_pc32 = (opcode == 0xff
1852 || !relocx
1853 || require_reloc_pc32
1854 || is_pic);
1855
1856 /* Get the symbol referred to by the reloc. */
1857 if (h == NULL)
1858 {
1859 Elf_Internal_Sym *isym
1860 = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx);
1861
1862 /* Skip relocation against undefined symbols. */
1863 if (isym->st_shndx == SHN_UNDEF)
1864 return TRUE;
1865
1866 symtype = ELF_ST_TYPE (isym->st_info);
1867
1868 if (isym->st_shndx == SHN_ABS)
1869 tsec = bfd_abs_section_ptr;
1870 else if (isym->st_shndx == SHN_COMMON)
1871 tsec = bfd_com_section_ptr;
1872 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
1873 tsec = &_bfd_elf_large_com_section;
1874 else
1875 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1876
1877 toff = isym->st_value;
1878 }
1879 else
1880 {
1881 /* Undefined weak symbol is only bound locally in executable
1882 and its reference is resolved as 0 without relocation
1883 overflow. We can only perform this optimization for
1884 GOTPCRELX relocations since we need to modify REX byte.
1885 It is OK convert mov with R_X86_64_GOTPCREL to
1886 R_X86_64_PC32. */
1887 if ((relocx || opcode == 0x8b)
1888 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info,
1889 TRUE,
1890 elf_x86_64_hash_entry (h)))
1891 {
1892 if (opcode == 0xff)
1893 {
1894 /* Skip for branch instructions since R_X86_64_PC32
1895 may overflow. */
1896 if (require_reloc_pc32)
1897 return TRUE;
1898 }
1899 else if (relocx)
1900 {
1901 /* For non-branch instructions, we can convert to
1902 R_X86_64_32/R_X86_64_32S since we know if there
1903 is a REX byte. */
1904 to_reloc_pc32 = FALSE;
1905 }
1906
1907 /* Since we don't know the current PC when PIC is true,
1908 we can't convert to R_X86_64_PC32. */
1909 if (to_reloc_pc32 && is_pic)
1910 return TRUE;
1911
1912 goto convert;
1913 }
1914 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
1915 ld.so may use its link-time address. */
1916 else if ((h->def_regular
1917 || h->root.type == bfd_link_hash_defined
1918 || h->root.type == bfd_link_hash_defweak)
1919 && h != htab->elf.hdynamic
1920 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1921 {
1922 /* bfd_link_hash_new or bfd_link_hash_undefined is
1923 set by an assignment in a linker script in
1924 bfd_elf_record_link_assignment. */
1925 if (h->def_regular
1926 && (h->root.type == bfd_link_hash_new
1927 || h->root.type == bfd_link_hash_undefined
1928 || ((h->root.type == bfd_link_hash_defined
1929 || h->root.type == bfd_link_hash_defweak)
1930 && h->root.u.def.section == bfd_und_section_ptr)))
1931 {
1932 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
1933 if (require_reloc_pc32)
1934 return TRUE;
1935 goto convert;
1936 }
1937 tsec = h->root.u.def.section;
1938 toff = h->root.u.def.value;
1939 symtype = h->type;
1940 }
1941 else
1942 return TRUE;
1943 }
1944
1945 /* Don't convert GOTPCREL relocation against large section. */
1946 if (elf_section_data (tsec) != NULL
1947 && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0)
1948 return TRUE;
1949
1950 /* We can only estimate relocation overflow for R_X86_64_PC32. */
1951 if (!to_reloc_pc32)
1952 goto convert;
1953
1954 if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
1955 {
1956 /* At this stage in linking, no SEC_MERGE symbol has been
1957 adjusted, so all references to such symbols need to be
1958 passed through _bfd_merged_section_offset. (Later, in
1959 relocate_section, all SEC_MERGE symbols *except* for
1960 section symbols have been adjusted.)
1961
1962 gas may reduce relocations against symbols in SEC_MERGE
1963 sections to a relocation against the section symbol when
1964 the original addend was zero. When the reloc is against
1965 a section symbol we should include the addend in the
1966 offset passed to _bfd_merged_section_offset, since the
1967 location of interest is the original symbol. On the
1968 other hand, an access to "sym+addend" where "sym" is not
1969 a section symbol should not include the addend; Such an
1970 access is presumed to be an offset from "sym"; The
1971 location of interest is just "sym". */
1972 if (symtype == STT_SECTION)
1973 toff += raddend;
1974
1975 toff = _bfd_merged_section_offset (abfd, &tsec,
1976 elf_section_data (tsec)->sec_info,
1977 toff);
1978
1979 if (symtype != STT_SECTION)
1980 toff += raddend;
1981 }
1982 else
1983 toff += raddend;
1984
1985 /* Don't convert if R_X86_64_PC32 relocation overflows. */
1986 if (tsec->output_section == sec->output_section)
1987 {
1988 if ((toff - roff + 0x80000000) > 0xffffffff)
1989 return TRUE;
1990 }
1991 else
1992 {
1993 bfd_signed_vma distance;
1994
1995 /* At this point, we don't know the load addresses of TSEC
1996 section nor SEC section. We estimate the distrance between
1997 SEC and TSEC. We store the estimated distances in the
1998 compressed_size field of the output section, which is only
1999 used to decompress the compressed input section. */
2000 if (sec->output_section->compressed_size == 0)
2001 {
2002 asection *asect;
2003 bfd_size_type size = 0;
2004 for (asect = link_info->output_bfd->sections;
2005 asect != NULL;
2006 asect = asect->next)
2007 /* Skip debug sections since compressed_size is used to
2008 compress debug sections. */
2009 if ((asect->flags & SEC_DEBUGGING) == 0)
2010 {
2011 asection *i;
2012 for (i = asect->map_head.s;
2013 i != NULL;
2014 i = i->map_head.s)
2015 {
2016 size = align_power (size, i->alignment_power);
2017 size += i->size;
2018 }
2019 asect->compressed_size = size;
2020 }
2021 }
2022
2023 /* Don't convert GOTPCREL relocations if TSEC isn't placed
2024 after SEC. */
2025 distance = (tsec->output_section->compressed_size
2026 - sec->output_section->compressed_size);
2027 if (distance < 0)
2028 return TRUE;
2029
2030 /* Take PT_GNU_RELRO segment into account by adding
2031 maxpagesize. */
2032 if ((toff + distance + get_elf_backend_data (abfd)->maxpagesize
2033 - roff + 0x80000000) > 0xffffffff)
2034 return TRUE;
2035 }
2036
2037 convert:
2038 if (opcode == 0xff)
2039 {
2040 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
2041 unsigned int nop;
2042 unsigned int disp;
2043 bfd_vma nop_offset;
2044
2045 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
2046 R_X86_64_PC32. */
2047 modrm = bfd_get_8 (abfd, contents + roff - 1);
2048 if (modrm == 0x25)
2049 {
2050 /* Convert to "jmp foo nop". */
2051 modrm = 0xe9;
2052 nop = NOP_OPCODE;
2053 nop_offset = irel->r_offset + 3;
2054 disp = bfd_get_32 (abfd, contents + irel->r_offset);
2055 irel->r_offset -= 1;
2056 bfd_put_32 (abfd, disp, contents + irel->r_offset);
2057 }
2058 else
2059 {
2060 struct elf_x86_64_link_hash_entry *eh
2061 = (struct elf_x86_64_link_hash_entry *) h;
2062
2063 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
2064 is a nop prefix. */
2065 modrm = 0xe8;
2066 /* To support TLS optimization, always use addr32 prefix for
2067 "call *__tls_get_addr@GOTPCREL(%rip)". */
2068 if (eh && eh->tls_get_addr == 1)
2069 {
2070 nop = 0x67;
2071 nop_offset = irel->r_offset - 2;
2072 }
2073 else
2074 {
2075 nop = link_info->call_nop_byte;
2076 if (link_info->call_nop_as_suffix)
2077 {
2078 nop_offset = irel->r_offset + 3;
2079 disp = bfd_get_32 (abfd, contents + irel->r_offset);
2080 irel->r_offset -= 1;
2081 bfd_put_32 (abfd, disp, contents + irel->r_offset);
2082 }
2083 else
2084 nop_offset = irel->r_offset - 2;
2085 }
2086 }
2087 bfd_put_8 (abfd, nop, contents + nop_offset);
2088 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
2089 r_type = R_X86_64_PC32;
2090 }
2091 else
2092 {
2093 unsigned int rex;
2094 unsigned int rex_mask = REX_R;
2095
2096 if (r_type == R_X86_64_REX_GOTPCRELX)
2097 rex = bfd_get_8 (abfd, contents + roff - 3);
2098 else
2099 rex = 0;
2100
2101 if (opcode == 0x8b)
2102 {
2103 if (to_reloc_pc32)
2104 {
2105 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
2106 "lea foo(%rip), %reg". */
2107 opcode = 0x8d;
2108 r_type = R_X86_64_PC32;
2109 }
2110 else
2111 {
2112 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
2113 "mov $foo, %reg". */
2114 opcode = 0xc7;
2115 modrm = bfd_get_8 (abfd, contents + roff - 1);
2116 modrm = 0xc0 | (modrm & 0x38) >> 3;
2117 if ((rex & REX_W) != 0
2118 && ABI_64_P (link_info->output_bfd))
2119 {
2120 /* Keep the REX_W bit in REX byte for LP64. */
2121 r_type = R_X86_64_32S;
2122 goto rewrite_modrm_rex;
2123 }
2124 else
2125 {
2126 /* If the REX_W bit in REX byte isn't needed,
2127 use R_X86_64_32 and clear the W bit to avoid
2128 sign-extend imm32 to imm64. */
2129 r_type = R_X86_64_32;
2130 /* Clear the W bit in REX byte. */
2131 rex_mask |= REX_W;
2132 goto rewrite_modrm_rex;
2133 }
2134 }
2135 }
2136 else
2137 {
2138 /* R_X86_64_PC32 isn't supported. */
2139 if (to_reloc_pc32)
2140 return TRUE;
2141
2142 modrm = bfd_get_8 (abfd, contents + roff - 1);
2143 if (opcode == 0x85)
2144 {
2145 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
2146 "test $foo, %reg". */
2147 modrm = 0xc0 | (modrm & 0x38) >> 3;
2148 opcode = 0xf7;
2149 }
2150 else
2151 {
2152 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
2153 "binop $foo, %reg". */
2154 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
2155 opcode = 0x81;
2156 }
2157
2158 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
2159 overflow when sign-extending imm32 to imm64. */
2160 r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32;
2161
2162 rewrite_modrm_rex:
2163 bfd_put_8 (abfd, modrm, contents + roff - 1);
2164
2165 if (rex)
2166 {
2167 /* Move the R bit to the B bit in REX byte. */
2168 rex = (rex & ~rex_mask) | (rex & REX_R) >> 2;
2169 bfd_put_8 (abfd, rex, contents + roff - 3);
2170 }
2171
2172 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
2173 irel->r_addend = 0;
2174 }
2175
2176 bfd_put_8 (abfd, opcode, contents + roff - 2);
2177 }
2178
2179 irel->r_info = htab->r_info (r_symndx, r_type);
2180
2181 *converted = TRUE;
2182
2183 return TRUE;
2184 }
2185
2186 /* Look through the relocs for a section during the first phase, and
2187 calculate needed space in the global offset table, procedure
2188 linkage table, and dynamic reloc sections. */
2189
2190 static bfd_boolean
2191 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
2192 asection *sec,
2193 const Elf_Internal_Rela *relocs)
2194 {
2195 struct elf_x86_64_link_hash_table *htab;
2196 Elf_Internal_Shdr *symtab_hdr;
2197 struct elf_link_hash_entry **sym_hashes;
2198 const Elf_Internal_Rela *rel;
2199 const Elf_Internal_Rela *rel_end;
2200 asection *sreloc;
2201 bfd_byte *contents;
2202 bfd_boolean use_plt_got;
2203
2204 if (bfd_link_relocatable (info))
2205 return TRUE;
2206
2207 /* Don't do anything special with non-loaded, non-alloced sections.
2208 In particular, any relocs in such sections should not affect GOT
2209 and PLT reference counting (ie. we don't allow them to create GOT
2210 or PLT entries), there's no possibility or desire to optimize TLS
2211 relocs, and there's not much point in propagating relocs to shared
2212 libs that the dynamic linker won't relocate. */
2213 if ((sec->flags & SEC_ALLOC) == 0)
2214 return TRUE;
2215
2216 BFD_ASSERT (is_x86_64_elf (abfd));
2217
2218 htab = elf_x86_64_hash_table (info);
2219 if (htab == NULL)
2220 {
2221 sec->check_relocs_failed = 1;
2222 return FALSE;
2223 }
2224
2225 /* Get the section contents. */
2226 if (elf_section_data (sec)->this_hdr.contents != NULL)
2227 contents = elf_section_data (sec)->this_hdr.contents;
2228 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2229 {
2230 sec->check_relocs_failed = 1;
2231 return FALSE;
2232 }
2233
2234 use_plt_got = get_elf_x86_64_backend_data (abfd) == &elf_x86_64_arch_bed;
2235
2236 symtab_hdr = &elf_symtab_hdr (abfd);
2237 sym_hashes = elf_sym_hashes (abfd);
2238
2239 sreloc = NULL;
2240
2241 rel_end = relocs + sec->reloc_count;
2242 for (rel = relocs; rel < rel_end; rel++)
2243 {
2244 unsigned int r_type;
2245 unsigned long r_symndx;
2246 struct elf_link_hash_entry *h;
2247 struct elf_x86_64_link_hash_entry *eh;
2248 Elf_Internal_Sym *isym;
2249 const char *name;
2250 bfd_boolean size_reloc;
2251
2252 r_symndx = htab->r_sym (rel->r_info);
2253 r_type = ELF32_R_TYPE (rel->r_info);
2254
2255 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
2256 {
2257 /* xgettext:c-format */
2258 _bfd_error_handler (_("%B: bad symbol index: %d"),
2259 abfd, r_symndx);
2260 goto error_return;
2261 }
2262
2263 if (r_symndx < symtab_hdr->sh_info)
2264 {
2265 /* A local symbol. */
2266 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2267 abfd, r_symndx);
2268 if (isym == NULL)
2269 goto error_return;
2270
2271 /* Check relocation against local STT_GNU_IFUNC symbol. */
2272 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2273 {
2274 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
2275 TRUE);
2276 if (h == NULL)
2277 goto error_return;
2278
2279 /* Fake a STT_GNU_IFUNC symbol. */
2280 h->type = STT_GNU_IFUNC;
2281 h->def_regular = 1;
2282 h->ref_regular = 1;
2283 h->forced_local = 1;
2284 h->root.type = bfd_link_hash_defined;
2285 }
2286 else
2287 h = NULL;
2288 }
2289 else
2290 {
2291 isym = NULL;
2292 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2293 while (h->root.type == bfd_link_hash_indirect
2294 || h->root.type == bfd_link_hash_warning)
2295 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2296 }
2297
2298 /* Check invalid x32 relocations. */
2299 if (!ABI_64_P (abfd))
2300 switch (r_type)
2301 {
2302 default:
2303 break;
2304
2305 case R_X86_64_DTPOFF64:
2306 case R_X86_64_TPOFF64:
2307 case R_X86_64_PC64:
2308 case R_X86_64_GOTOFF64:
2309 case R_X86_64_GOT64:
2310 case R_X86_64_GOTPCREL64:
2311 case R_X86_64_GOTPC64:
2312 case R_X86_64_GOTPLT64:
2313 case R_X86_64_PLTOFF64:
2314 {
2315 if (h)
2316 name = h->root.root.string;
2317 else
2318 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2319 NULL);
2320 _bfd_error_handler
2321 /* xgettext:c-format */
2322 (_("%B: relocation %s against symbol `%s' isn't "
2323 "supported in x32 mode"), abfd,
2324 x86_64_elf_howto_table[r_type].name, name);
2325 bfd_set_error (bfd_error_bad_value);
2326 goto error_return;
2327 }
2328 break;
2329 }
2330
2331 if (h != NULL)
2332 {
2333 switch (r_type)
2334 {
2335 default:
2336 break;
2337
2338 case R_X86_64_PC32_BND:
2339 case R_X86_64_PLT32_BND:
2340 case R_X86_64_PC32:
2341 case R_X86_64_PLT32:
2342 case R_X86_64_32:
2343 case R_X86_64_64:
2344 /* MPX PLT is supported only if elf_x86_64_arch_bed
2345 is used in 64-bit mode. */
2346 if (ABI_64_P (abfd)
2347 && info->bndplt
2348 && (get_elf_x86_64_backend_data (abfd)
2349 == &elf_x86_64_arch_bed))
2350 {
2351 elf_x86_64_hash_entry (h)->has_bnd_reloc = 1;
2352
2353 /* Create the second PLT for Intel MPX support. */
2354 if (htab->plt_bnd == NULL)
2355 {
2356 const struct elf_backend_data *bed;
2357
2358 bed = get_elf_backend_data (info->output_bfd);
2359 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry) == 8
2360 && (sizeof (elf_x86_64_bnd_plt2_entry)
2361 == sizeof (elf_x86_64_legacy_plt2_entry)));
2362
2363 if (htab->elf.dynobj == NULL)
2364 htab->elf.dynobj = abfd;
2365 htab->plt_bnd
2366 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2367 ".plt.bnd",
2368 (bed->dynamic_sec_flags
2369 | SEC_ALLOC
2370 | SEC_CODE
2371 | SEC_LOAD
2372 | SEC_READONLY));
2373 if (htab->plt_bnd == NULL
2374 || !bfd_set_section_alignment (htab->elf.dynobj,
2375 htab->plt_bnd,
2376 3))
2377 goto error_return;
2378 }
2379
2380 if (!info->no_ld_generated_unwind_info
2381 && htab->plt_bnd_eh_frame == NULL)
2382 {
2383 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
2384 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2385 | SEC_LINKER_CREATED);
2386 htab->plt_bnd_eh_frame
2387 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2388 ".eh_frame",
2389 flags);
2390 if (htab->plt_bnd_eh_frame == NULL
2391 || !bfd_set_section_alignment (htab->elf.dynobj,
2392 htab->plt_bnd_eh_frame,
2393 3))
2394 goto error_return;
2395 }
2396 }
2397 /* Fall through. */
2398
2399 case R_X86_64_32S:
2400 case R_X86_64_PC64:
2401 case R_X86_64_GOTPCREL:
2402 case R_X86_64_GOTPCRELX:
2403 case R_X86_64_REX_GOTPCRELX:
2404 case R_X86_64_GOTPCREL64:
2405 if (htab->elf.dynobj == NULL)
2406 htab->elf.dynobj = abfd;
2407 /* Create the ifunc sections for static executables. */
2408 if (h->type == STT_GNU_IFUNC
2409 && !_bfd_elf_create_ifunc_sections (htab->elf.dynobj,
2410 info))
2411 goto error_return;
2412 break;
2413 }
2414
2415 /* It is referenced by a non-shared object. */
2416 h->ref_regular = 1;
2417 h->root.non_ir_ref = 1;
2418
2419 if (h->type == STT_GNU_IFUNC)
2420 elf_tdata (info->output_bfd)->has_gnu_symbols
2421 |= elf_gnu_symbol_ifunc;
2422 }
2423
2424 if (! elf_x86_64_tls_transition (info, abfd, sec, contents,
2425 symtab_hdr, sym_hashes,
2426 &r_type, GOT_UNKNOWN,
2427 rel, rel_end, h, r_symndx, FALSE))
2428 goto error_return;
2429
2430 eh = (struct elf_x86_64_link_hash_entry *) h;
2431 switch (r_type)
2432 {
2433 case R_X86_64_TLSLD:
2434 htab->tls_ld_got.refcount += 1;
2435 goto create_got;
2436
2437 case R_X86_64_TPOFF32:
2438 if (!bfd_link_executable (info) && ABI_64_P (abfd))
2439 return elf_x86_64_need_pic (abfd, sec, h, symtab_hdr, isym,
2440 &x86_64_elf_howto_table[r_type]);
2441 if (eh != NULL)
2442 eh->has_got_reloc = 1;
2443 break;
2444
2445 case R_X86_64_GOTTPOFF:
2446 if (!bfd_link_executable (info))
2447 info->flags |= DF_STATIC_TLS;
2448 /* Fall through */
2449
2450 case R_X86_64_GOT32:
2451 case R_X86_64_GOTPCREL:
2452 case R_X86_64_GOTPCRELX:
2453 case R_X86_64_REX_GOTPCRELX:
2454 case R_X86_64_TLSGD:
2455 case R_X86_64_GOT64:
2456 case R_X86_64_GOTPCREL64:
2457 case R_X86_64_GOTPLT64:
2458 case R_X86_64_GOTPC32_TLSDESC:
2459 case R_X86_64_TLSDESC_CALL:
2460 /* This symbol requires a global offset table entry. */
2461 {
2462 int tls_type, old_tls_type;
2463
2464 switch (r_type)
2465 {
2466 default: tls_type = GOT_NORMAL; break;
2467 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
2468 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
2469 case R_X86_64_GOTPC32_TLSDESC:
2470 case R_X86_64_TLSDESC_CALL:
2471 tls_type = GOT_TLS_GDESC; break;
2472 }
2473
2474 if (h != NULL)
2475 {
2476 h->got.refcount += 1;
2477 old_tls_type = eh->tls_type;
2478 }
2479 else
2480 {
2481 bfd_signed_vma *local_got_refcounts;
2482
2483 /* This is a global offset table entry for a local symbol. */
2484 local_got_refcounts = elf_local_got_refcounts (abfd);
2485 if (local_got_refcounts == NULL)
2486 {
2487 bfd_size_type size;
2488
2489 size = symtab_hdr->sh_info;
2490 size *= sizeof (bfd_signed_vma)
2491 + sizeof (bfd_vma) + sizeof (char);
2492 local_got_refcounts = ((bfd_signed_vma *)
2493 bfd_zalloc (abfd, size));
2494 if (local_got_refcounts == NULL)
2495 goto error_return;
2496 elf_local_got_refcounts (abfd) = local_got_refcounts;
2497 elf_x86_64_local_tlsdesc_gotent (abfd)
2498 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2499 elf_x86_64_local_got_tls_type (abfd)
2500 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2501 }
2502 local_got_refcounts[r_symndx] += 1;
2503 old_tls_type
2504 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
2505 }
2506
2507 /* If a TLS symbol is accessed using IE at least once,
2508 there is no point to use dynamic model for it. */
2509 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2510 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2511 || tls_type != GOT_TLS_IE))
2512 {
2513 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
2514 tls_type = old_tls_type;
2515 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2516 && GOT_TLS_GD_ANY_P (tls_type))
2517 tls_type |= old_tls_type;
2518 else
2519 {
2520 if (h)
2521 name = h->root.root.string;
2522 else
2523 name = bfd_elf_sym_name (abfd, symtab_hdr,
2524 isym, NULL);
2525 _bfd_error_handler
2526 /* xgettext:c-format */
2527 (_("%B: '%s' accessed both as normal and thread local symbol"),
2528 abfd, name);
2529 bfd_set_error (bfd_error_bad_value);
2530 goto error_return;
2531 }
2532 }
2533
2534 if (old_tls_type != tls_type)
2535 {
2536 if (eh != NULL)
2537 eh->tls_type = tls_type;
2538 else
2539 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
2540 }
2541 }
2542 /* Fall through */
2543
2544 case R_X86_64_GOTOFF64:
2545 case R_X86_64_GOTPC32:
2546 case R_X86_64_GOTPC64:
2547 create_got:
2548 if (eh != NULL)
2549 eh->has_got_reloc = 1;
2550 if (htab->elf.sgot == NULL)
2551 {
2552 if (htab->elf.dynobj == NULL)
2553 htab->elf.dynobj = abfd;
2554 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
2555 info))
2556 goto error_return;
2557 }
2558 break;
2559
2560 case R_X86_64_PLT32:
2561 case R_X86_64_PLT32_BND:
2562 /* This symbol requires a procedure linkage table entry. We
2563 actually build the entry in adjust_dynamic_symbol,
2564 because this might be a case of linking PIC code which is
2565 never referenced by a dynamic object, in which case we
2566 don't need to generate a procedure linkage table entry
2567 after all. */
2568
2569 /* If this is a local symbol, we resolve it directly without
2570 creating a procedure linkage table entry. */
2571 if (h == NULL)
2572 continue;
2573
2574 eh->has_got_reloc = 1;
2575 h->needs_plt = 1;
2576 h->plt.refcount += 1;
2577 break;
2578
2579 case R_X86_64_PLTOFF64:
2580 /* This tries to form the 'address' of a function relative
2581 to GOT. For global symbols we need a PLT entry. */
2582 if (h != NULL)
2583 {
2584 h->needs_plt = 1;
2585 h->plt.refcount += 1;
2586 }
2587 goto create_got;
2588
2589 case R_X86_64_SIZE32:
2590 case R_X86_64_SIZE64:
2591 size_reloc = TRUE;
2592 goto do_size;
2593
2594 case R_X86_64_32:
2595 if (!ABI_64_P (abfd))
2596 goto pointer;
2597 /* Fall through. */
2598 case R_X86_64_8:
2599 case R_X86_64_16:
2600 case R_X86_64_32S:
2601 /* Check relocation overflow as these relocs may lead to
2602 run-time relocation overflow. Don't error out for
2603 sections we don't care about, such as debug sections or
2604 when relocation overflow check is disabled. */
2605 if (!info->no_reloc_overflow_check
2606 && (bfd_link_pic (info)
2607 || (bfd_link_executable (info)
2608 && h != NULL
2609 && !h->def_regular
2610 && h->def_dynamic
2611 && (sec->flags & SEC_READONLY) == 0)))
2612 return elf_x86_64_need_pic (abfd, sec, h, symtab_hdr, isym,
2613 &x86_64_elf_howto_table[r_type]);
2614 /* Fall through. */
2615
2616 case R_X86_64_PC8:
2617 case R_X86_64_PC16:
2618 case R_X86_64_PC32:
2619 case R_X86_64_PC32_BND:
2620 case R_X86_64_PC64:
2621 case R_X86_64_64:
2622 pointer:
2623 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2624 eh->has_non_got_reloc = 1;
2625 /* We are called after all symbols have been resolved. Only
2626 relocation against STT_GNU_IFUNC symbol must go through
2627 PLT. */
2628 if (h != NULL
2629 && (bfd_link_executable (info)
2630 || h->type == STT_GNU_IFUNC))
2631 {
2632 /* If this reloc is in a read-only section, we might
2633 need a copy reloc. We can't check reliably at this
2634 stage whether the section is read-only, as input
2635 sections have not yet been mapped to output sections.
2636 Tentatively set the flag for now, and correct in
2637 adjust_dynamic_symbol. */
2638 h->non_got_ref = 1;
2639
2640 /* We may need a .plt entry if the symbol is a function
2641 defined in a shared lib or is a STT_GNU_IFUNC function
2642 referenced from the code or read-only section. */
2643 if (!h->def_regular
2644 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2645 h->plt.refcount += 1;
2646
2647 if (r_type == R_X86_64_PC32)
2648 {
2649 /* Since something like ".long foo - ." may be used
2650 as pointer, make sure that PLT is used if foo is
2651 a function defined in a shared library. */
2652 if ((sec->flags & SEC_CODE) == 0)
2653 h->pointer_equality_needed = 1;
2654 }
2655 else if (r_type != R_X86_64_PC32_BND
2656 && r_type != R_X86_64_PC64)
2657 {
2658 h->pointer_equality_needed = 1;
2659 /* At run-time, R_X86_64_64 can be resolved for both
2660 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2661 can only be resolved for x32. */
2662 if ((sec->flags & SEC_READONLY) == 0
2663 && (r_type == R_X86_64_64
2664 || (!ABI_64_P (abfd)
2665 && (r_type == R_X86_64_32
2666 || r_type == R_X86_64_32S))))
2667 eh->func_pointer_refcount += 1;
2668 }
2669 }
2670
2671 size_reloc = FALSE;
2672 do_size:
2673 /* If we are creating a shared library, and this is a reloc
2674 against a global symbol, or a non PC relative reloc
2675 against a local symbol, then we need to copy the reloc
2676 into the shared library. However, if we are linking with
2677 -Bsymbolic, we do not need to copy a reloc against a
2678 global symbol which is defined in an object we are
2679 including in the link (i.e., DEF_REGULAR is set). At
2680 this point we have not seen all the input files, so it is
2681 possible that DEF_REGULAR is not set now but will be set
2682 later (it is never cleared). In case of a weak definition,
2683 DEF_REGULAR may be cleared later by a strong definition in
2684 a shared library. We account for that possibility below by
2685 storing information in the relocs_copied field of the hash
2686 table entry. A similar situation occurs when creating
2687 shared libraries and symbol visibility changes render the
2688 symbol local.
2689
2690 If on the other hand, we are creating an executable, we
2691 may need to keep relocations for symbols satisfied by a
2692 dynamic library if we manage to avoid copy relocs for the
2693 symbol.
2694
2695 Generate dynamic pointer relocation against STT_GNU_IFUNC
2696 symbol in the non-code section. */
2697 if ((bfd_link_pic (info)
2698 && (! IS_X86_64_PCREL_TYPE (r_type)
2699 || (h != NULL
2700 && (! (bfd_link_pie (info)
2701 || SYMBOLIC_BIND (info, h))
2702 || h->root.type == bfd_link_hash_defweak
2703 || !h->def_regular))))
2704 || (h != NULL
2705 && h->type == STT_GNU_IFUNC
2706 && r_type == htab->pointer_r_type
2707 && (sec->flags & SEC_CODE) == 0)
2708 || (ELIMINATE_COPY_RELOCS
2709 && !bfd_link_pic (info)
2710 && h != NULL
2711 && (h->root.type == bfd_link_hash_defweak
2712 || !h->def_regular)))
2713 {
2714 struct elf_dyn_relocs *p;
2715 struct elf_dyn_relocs **head;
2716
2717 /* We must copy these reloc types into the output file.
2718 Create a reloc section in dynobj and make room for
2719 this reloc. */
2720 if (sreloc == NULL)
2721 {
2722 if (htab->elf.dynobj == NULL)
2723 htab->elf.dynobj = abfd;
2724
2725 sreloc = _bfd_elf_make_dynamic_reloc_section
2726 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2727 abfd, /*rela?*/ TRUE);
2728
2729 if (sreloc == NULL)
2730 goto error_return;
2731 }
2732
2733 /* If this is a global symbol, we count the number of
2734 relocations we need for this symbol. */
2735 if (h != NULL)
2736 head = &eh->dyn_relocs;
2737 else
2738 {
2739 /* Track dynamic relocs needed for local syms too.
2740 We really need local syms available to do this
2741 easily. Oh well. */
2742 asection *s;
2743 void **vpp;
2744
2745 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2746 abfd, r_symndx);
2747 if (isym == NULL)
2748 goto error_return;
2749
2750 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2751 if (s == NULL)
2752 s = sec;
2753
2754 /* Beware of type punned pointers vs strict aliasing
2755 rules. */
2756 vpp = &(elf_section_data (s)->local_dynrel);
2757 head = (struct elf_dyn_relocs **)vpp;
2758 }
2759
2760 p = *head;
2761 if (p == NULL || p->sec != sec)
2762 {
2763 bfd_size_type amt = sizeof *p;
2764
2765 p = ((struct elf_dyn_relocs *)
2766 bfd_alloc (htab->elf.dynobj, amt));
2767 if (p == NULL)
2768 goto error_return;
2769 p->next = *head;
2770 *head = p;
2771 p->sec = sec;
2772 p->count = 0;
2773 p->pc_count = 0;
2774 }
2775
2776 p->count += 1;
2777 /* Count size relocation as PC-relative relocation. */
2778 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2779 p->pc_count += 1;
2780 }
2781 break;
2782
2783 /* This relocation describes the C++ object vtable hierarchy.
2784 Reconstruct it for later use during GC. */
2785 case R_X86_64_GNU_VTINHERIT:
2786 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2787 goto error_return;
2788 break;
2789
2790 /* This relocation describes which C++ vtable entries are actually
2791 used. Record for later use during GC. */
2792 case R_X86_64_GNU_VTENTRY:
2793 BFD_ASSERT (h != NULL);
2794 if (h != NULL
2795 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2796 goto error_return;
2797 break;
2798
2799 default:
2800 break;
2801 }
2802
2803 if (use_plt_got
2804 && h != NULL
2805 && h->plt.refcount > 0
2806 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2807 || h->got.refcount > 0)
2808 && htab->plt_got == NULL)
2809 {
2810 /* Create the GOT procedure linkage table. */
2811 unsigned int plt_got_align;
2812 const struct elf_backend_data *bed;
2813
2814 bed = get_elf_backend_data (info->output_bfd);
2815 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry) == 8
2816 && (sizeof (elf_x86_64_bnd_plt2_entry)
2817 == sizeof (elf_x86_64_legacy_plt2_entry)));
2818 plt_got_align = 3;
2819
2820 if (htab->elf.dynobj == NULL)
2821 htab->elf.dynobj = abfd;
2822 htab->plt_got
2823 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2824 ".plt.got",
2825 (bed->dynamic_sec_flags
2826 | SEC_ALLOC
2827 | SEC_CODE
2828 | SEC_LOAD
2829 | SEC_READONLY));
2830 if (htab->plt_got == NULL
2831 || !bfd_set_section_alignment (htab->elf.dynobj,
2832 htab->plt_got,
2833 plt_got_align))
2834 goto error_return;
2835
2836 if (!info->no_ld_generated_unwind_info
2837 && htab->plt_got_eh_frame == NULL
2838 && get_elf_x86_64_backend_data (abfd)->eh_frame_plt_got != NULL)
2839 {
2840 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
2841 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2842 | SEC_LINKER_CREATED);
2843 htab->plt_got_eh_frame
2844 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2845 ".eh_frame",
2846 flags);
2847 if (htab->plt_got_eh_frame == NULL
2848 || !bfd_set_section_alignment (htab->elf.dynobj,
2849 htab->plt_got_eh_frame,
2850 ABI_64_P (htab->elf.dynobj) ? 3 : 2))
2851 goto error_return;
2852 }
2853 }
2854
2855 if ((r_type == R_X86_64_GOTPCREL
2856 || r_type == R_X86_64_GOTPCRELX
2857 || r_type == R_X86_64_REX_GOTPCRELX)
2858 && (h == NULL || h->type != STT_GNU_IFUNC))
2859 sec->need_convert_load = 1;
2860 }
2861
2862 if (elf_section_data (sec)->this_hdr.contents != contents)
2863 {
2864 if (!info->keep_memory)
2865 free (contents);
2866 else
2867 {
2868 /* Cache the section contents for elf_link_input_bfd. */
2869 elf_section_data (sec)->this_hdr.contents = contents;
2870 }
2871 }
2872
2873 return TRUE;
2874
2875 error_return:
2876 if (elf_section_data (sec)->this_hdr.contents != contents)
2877 free (contents);
2878 sec->check_relocs_failed = 1;
2879 return FALSE;
2880 }
2881
2882 /* Return the section that should be marked against GC for a given
2883 relocation. */
2884
2885 static asection *
2886 elf_x86_64_gc_mark_hook (asection *sec,
2887 struct bfd_link_info *info,
2888 Elf_Internal_Rela *rel,
2889 struct elf_link_hash_entry *h,
2890 Elf_Internal_Sym *sym)
2891 {
2892 if (h != NULL)
2893 switch (ELF32_R_TYPE (rel->r_info))
2894 {
2895 case R_X86_64_GNU_VTINHERIT:
2896 case R_X86_64_GNU_VTENTRY:
2897 return NULL;
2898 }
2899
2900 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2901 }
2902
2903 /* Remove undefined weak symbol from the dynamic symbol table if it
2904 is resolved to 0. */
2905
2906 static bfd_boolean
2907 elf_x86_64_fixup_symbol (struct bfd_link_info *info,
2908 struct elf_link_hash_entry *h)
2909 {
2910 if (h->dynindx != -1
2911 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2912 elf_x86_64_hash_entry (h)->has_got_reloc,
2913 elf_x86_64_hash_entry (h)))
2914 {
2915 h->dynindx = -1;
2916 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2917 h->dynstr_index);
2918 }
2919 return TRUE;
2920 }
2921
2922 /* Adjust a symbol defined by a dynamic object and referenced by a
2923 regular object. The current definition is in some section of the
2924 dynamic object, but we're not including those sections. We have to
2925 change the definition to something the rest of the link can
2926 understand. */
2927
2928 static bfd_boolean
2929 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2930 struct elf_link_hash_entry *h)
2931 {
2932 struct elf_x86_64_link_hash_table *htab;
2933 asection *s, *srel;
2934 struct elf_x86_64_link_hash_entry *eh;
2935 struct elf_dyn_relocs *p;
2936
2937 /* STT_GNU_IFUNC symbol must go through PLT. */
2938 if (h->type == STT_GNU_IFUNC)
2939 {
2940 /* All local STT_GNU_IFUNC references must be treate as local
2941 calls via local PLT. */
2942 if (h->ref_regular
2943 && SYMBOL_CALLS_LOCAL (info, h))
2944 {
2945 bfd_size_type pc_count = 0, count = 0;
2946 struct elf_dyn_relocs **pp;
2947
2948 eh = (struct elf_x86_64_link_hash_entry *) h;
2949 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2950 {
2951 pc_count += p->pc_count;
2952 p->count -= p->pc_count;
2953 p->pc_count = 0;
2954 count += p->count;
2955 if (p->count == 0)
2956 *pp = p->next;
2957 else
2958 pp = &p->next;
2959 }
2960
2961 if (pc_count || count)
2962 {
2963 h->non_got_ref = 1;
2964 if (pc_count)
2965 {
2966 /* Increment PLT reference count only for PC-relative
2967 references. */
2968 h->needs_plt = 1;
2969 if (h->plt.refcount <= 0)
2970 h->plt.refcount = 1;
2971 else
2972 h->plt.refcount += 1;
2973 }
2974 }
2975 }
2976
2977 if (h->plt.refcount <= 0)
2978 {
2979 h->plt.offset = (bfd_vma) -1;
2980 h->needs_plt = 0;
2981 }
2982 return TRUE;
2983 }
2984
2985 /* If this is a function, put it in the procedure linkage table. We
2986 will fill in the contents of the procedure linkage table later,
2987 when we know the address of the .got section. */
2988 if (h->type == STT_FUNC
2989 || h->needs_plt)
2990 {
2991 if (h->plt.refcount <= 0
2992 || SYMBOL_CALLS_LOCAL (info, h)
2993 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2994 && h->root.type == bfd_link_hash_undefweak))
2995 {
2996 /* This case can occur if we saw a PLT32 reloc in an input
2997 file, but the symbol was never referred to by a dynamic
2998 object, or if all references were garbage collected. In
2999 such a case, we don't actually need to build a procedure
3000 linkage table, and we can just do a PC32 reloc instead. */
3001 h->plt.offset = (bfd_vma) -1;
3002 h->needs_plt = 0;
3003 }
3004
3005 return TRUE;
3006 }
3007 else
3008 /* It's possible that we incorrectly decided a .plt reloc was
3009 needed for an R_X86_64_PC32 reloc to a non-function sym in
3010 check_relocs. We can't decide accurately between function and
3011 non-function syms in check-relocs; Objects loaded later in
3012 the link may change h->type. So fix it now. */
3013 h->plt.offset = (bfd_vma) -1;
3014
3015 /* If this is a weak symbol, and there is a real definition, the
3016 processor independent code will have arranged for us to see the
3017 real definition first, and we can just use the same value. */
3018 if (h->u.weakdef != NULL)
3019 {
3020 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
3021 || h->u.weakdef->root.type == bfd_link_hash_defweak);
3022 h->root.u.def.section = h->u.weakdef->root.u.def.section;
3023 h->root.u.def.value = h->u.weakdef->root.u.def.value;
3024 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
3025 {
3026 eh = (struct elf_x86_64_link_hash_entry *) h;
3027 h->non_got_ref = h->u.weakdef->non_got_ref;
3028 eh->needs_copy = h->u.weakdef->needs_copy;
3029 }
3030 return TRUE;
3031 }
3032
3033 /* This is a reference to a symbol defined by a dynamic object which
3034 is not a function. */
3035
3036 /* If we are creating a shared library, we must presume that the
3037 only references to the symbol are via the global offset table.
3038 For such cases we need not do anything here; the relocations will
3039 be handled correctly by relocate_section. */
3040 if (!bfd_link_executable (info))
3041 return TRUE;
3042
3043 /* If there are no references to this symbol that do not use the
3044 GOT, we don't need to generate a copy reloc. */
3045 if (!h->non_got_ref)
3046 return TRUE;
3047
3048 /* If -z nocopyreloc was given, we won't generate them either. */
3049 if (info->nocopyreloc)
3050 {
3051 h->non_got_ref = 0;
3052 return TRUE;
3053 }
3054
3055 if (ELIMINATE_COPY_RELOCS)
3056 {
3057 eh = (struct elf_x86_64_link_hash_entry *) h;
3058 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3059 {
3060 s = p->sec->output_section;
3061 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3062 break;
3063 }
3064
3065 /* If we didn't find any dynamic relocs in read-only sections, then
3066 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
3067 if (p == NULL)
3068 {
3069 h->non_got_ref = 0;
3070 return TRUE;
3071 }
3072 }
3073
3074 /* We must allocate the symbol in our .dynbss section, which will
3075 become part of the .bss section of the executable. There will be
3076 an entry for this symbol in the .dynsym section. The dynamic
3077 object will contain position independent code, so all references
3078 from the dynamic object to this symbol will go through the global
3079 offset table. The dynamic linker will use the .dynsym entry to
3080 determine the address it must put in the global offset table, so
3081 both the dynamic object and the regular object will refer to the
3082 same memory location for the variable. */
3083
3084 htab = elf_x86_64_hash_table (info);
3085 if (htab == NULL)
3086 return FALSE;
3087
3088 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
3089 to copy the initial value out of the dynamic object and into the
3090 runtime process image. */
3091 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
3092 {
3093 s = htab->elf.sdynrelro;
3094 srel = htab->elf.sreldynrelro;
3095 }
3096 else
3097 {
3098 s = htab->elf.sdynbss;
3099 srel = htab->elf.srelbss;
3100 }
3101 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
3102 {
3103 const struct elf_backend_data *bed;
3104 bed = get_elf_backend_data (info->output_bfd);
3105 srel->size += bed->s->sizeof_rela;
3106 h->needs_copy = 1;
3107 }
3108
3109 return _bfd_elf_adjust_dynamic_copy (info, h, s);
3110 }
3111
3112 /* Allocate space in .plt, .got and associated reloc sections for
3113 dynamic relocs. */
3114
3115 static bfd_boolean
3116 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
3117 {
3118 struct bfd_link_info *info;
3119 struct elf_x86_64_link_hash_table *htab;
3120 struct elf_x86_64_link_hash_entry *eh;
3121 struct elf_dyn_relocs *p;
3122 const struct elf_backend_data *bed;
3123 unsigned int plt_entry_size;
3124 bfd_boolean resolved_to_zero;
3125
3126 if (h->root.type == bfd_link_hash_indirect)
3127 return TRUE;
3128
3129 eh = (struct elf_x86_64_link_hash_entry *) h;
3130
3131 info = (struct bfd_link_info *) inf;
3132 htab = elf_x86_64_hash_table (info);
3133 if (htab == NULL)
3134 return FALSE;
3135 bed = get_elf_backend_data (info->output_bfd);
3136 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3137
3138 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
3139 eh->has_got_reloc,
3140 eh);
3141
3142 /* We can't use the GOT PLT if pointer equality is needed since
3143 finish_dynamic_symbol won't clear symbol value and the dynamic
3144 linker won't update the GOT slot. We will get into an infinite
3145 loop at run-time. */
3146 if (htab->plt_got != NULL
3147 && h->type != STT_GNU_IFUNC
3148 && !h->pointer_equality_needed
3149 && h->plt.refcount > 0
3150 && h->got.refcount > 0)
3151 {
3152 /* Don't use the regular PLT if there are both GOT and GOTPLT
3153 reloctions. */
3154 h->plt.offset = (bfd_vma) -1;
3155
3156 /* Use the GOT PLT. */
3157 eh->plt_got.refcount = 1;
3158 }
3159
3160 /* Clear the reference count of function pointer relocations if
3161 symbol isn't a normal function. */
3162 if (h->type != STT_FUNC)
3163 eh->func_pointer_refcount = 0;
3164
3165 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
3166 here if it is defined and referenced in a non-shared object. */
3167 if (h->type == STT_GNU_IFUNC
3168 && h->def_regular)
3169 {
3170 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
3171 &eh->dyn_relocs,
3172 &htab->readonly_dynrelocs_against_ifunc,
3173 plt_entry_size,
3174 plt_entry_size,
3175 GOT_ENTRY_SIZE, TRUE))
3176 {
3177 asection *s = htab->plt_bnd;
3178 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
3179 {
3180 /* Use the .plt.bnd section if it is created. */
3181 eh->plt_bnd.offset = s->size;
3182
3183 /* Make room for this entry in the .plt.bnd section. */
3184 s->size += sizeof (elf_x86_64_legacy_plt2_entry);
3185 }
3186
3187 return TRUE;
3188 }
3189 else
3190 return FALSE;
3191 }
3192 /* Don't create the PLT entry if there are only function pointer
3193 relocations which can be resolved at run-time. */
3194 else if (htab->elf.dynamic_sections_created
3195 && (h->plt.refcount > eh->func_pointer_refcount
3196 || eh->plt_got.refcount > 0))
3197 {
3198 bfd_boolean use_plt_got;
3199
3200 /* Clear the reference count of function pointer relocations
3201 if PLT is used. */
3202 eh->func_pointer_refcount = 0;
3203
3204 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
3205 {
3206 /* Don't use the regular PLT for DF_BIND_NOW. */
3207 h->plt.offset = (bfd_vma) -1;
3208
3209 /* Use the GOT PLT. */
3210 h->got.refcount = 1;
3211 eh->plt_got.refcount = 1;
3212 }
3213
3214 use_plt_got = eh->plt_got.refcount > 0;
3215
3216 /* Make sure this symbol is output as a dynamic symbol.
3217 Undefined weak syms won't yet be marked as dynamic. */
3218 if (h->dynindx == -1
3219 && !h->forced_local
3220 && !resolved_to_zero)
3221 {
3222 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3223 return FALSE;
3224 }
3225
3226 if (bfd_link_pic (info)
3227 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
3228 {
3229 asection *s = htab->elf.splt;
3230 asection *bnd_s = htab->plt_bnd;
3231 asection *got_s = htab->plt_got;
3232
3233 /* If this is the first .plt entry, make room for the special
3234 first entry. The .plt section is used by prelink to undo
3235 prelinking for dynamic relocations. */
3236 if (s->size == 0)
3237 s->size = plt_entry_size;
3238
3239 if (use_plt_got)
3240 eh->plt_got.offset = got_s->size;
3241 else
3242 {
3243 h->plt.offset = s->size;
3244 if (bnd_s)
3245 eh->plt_bnd.offset = bnd_s->size;
3246 }
3247
3248 /* If this symbol is not defined in a regular file, and we are
3249 not generating a shared library, then set the symbol to this
3250 location in the .plt. This is required to make function
3251 pointers compare as equal between the normal executable and
3252 the shared library. */
3253 if (! bfd_link_pic (info)
3254 && !h->def_regular)
3255 {
3256 if (use_plt_got)
3257 {
3258 /* We need to make a call to the entry of the GOT PLT
3259 instead of regular PLT entry. */
3260 h->root.u.def.section = got_s;
3261 h->root.u.def.value = eh->plt_got.offset;
3262 }
3263 else
3264 {
3265 if (bnd_s)
3266 {
3267 /* We need to make a call to the entry of the second
3268 PLT instead of regular PLT entry. */
3269 h->root.u.def.section = bnd_s;
3270 h->root.u.def.value = eh->plt_bnd.offset;
3271 }
3272 else
3273 {
3274 h->root.u.def.section = s;
3275 h->root.u.def.value = h->plt.offset;
3276 }
3277 }
3278 }
3279
3280 /* Make room for this entry. */
3281 if (use_plt_got)
3282 got_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
3283 else
3284 {
3285 s->size += plt_entry_size;
3286 if (bnd_s)
3287 bnd_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
3288
3289 /* We also need to make an entry in the .got.plt section,
3290 which will be placed in the .got section by the linker
3291 script. */
3292 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
3293
3294 /* There should be no PLT relocation against resolved
3295 undefined weak symbol in executable. */
3296 if (!resolved_to_zero)
3297 {
3298 /* We also need to make an entry in the .rela.plt
3299 section. */
3300 htab->elf.srelplt->size += bed->s->sizeof_rela;
3301 htab->elf.srelplt->reloc_count++;
3302 }
3303 }
3304 }
3305 else
3306 {
3307 eh->plt_got.offset = (bfd_vma) -1;
3308 h->plt.offset = (bfd_vma) -1;
3309 h->needs_plt = 0;
3310 }
3311 }
3312 else
3313 {
3314 eh->plt_got.offset = (bfd_vma) -1;
3315 h->plt.offset = (bfd_vma) -1;
3316 h->needs_plt = 0;
3317 }
3318
3319 eh->tlsdesc_got = (bfd_vma) -1;
3320
3321 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
3322 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
3323 if (h->got.refcount > 0
3324 && bfd_link_executable (info)
3325 && h->dynindx == -1
3326 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
3327 {
3328 h->got.offset = (bfd_vma) -1;
3329 }
3330 else if (h->got.refcount > 0)
3331 {
3332 asection *s;
3333 bfd_boolean dyn;
3334 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
3335
3336 /* Make sure this symbol is output as a dynamic symbol.
3337 Undefined weak syms won't yet be marked as dynamic. */
3338 if (h->dynindx == -1
3339 && !h->forced_local
3340 && !resolved_to_zero)
3341 {
3342 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3343 return FALSE;
3344 }
3345
3346 if (GOT_TLS_GDESC_P (tls_type))
3347 {
3348 eh->tlsdesc_got = htab->elf.sgotplt->size
3349 - elf_x86_64_compute_jump_table_size (htab);
3350 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3351 h->got.offset = (bfd_vma) -2;
3352 }
3353 if (! GOT_TLS_GDESC_P (tls_type)
3354 || GOT_TLS_GD_P (tls_type))
3355 {
3356 s = htab->elf.sgot;
3357 h->got.offset = s->size;
3358 s->size += GOT_ENTRY_SIZE;
3359 if (GOT_TLS_GD_P (tls_type))
3360 s->size += GOT_ENTRY_SIZE;
3361 }
3362 dyn = htab->elf.dynamic_sections_created;
3363 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
3364 and two if global. R_X86_64_GOTTPOFF needs one dynamic
3365 relocation. No dynamic relocation against resolved undefined
3366 weak symbol in executable. */
3367 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
3368 || tls_type == GOT_TLS_IE)
3369 htab->elf.srelgot->size += bed->s->sizeof_rela;
3370 else if (GOT_TLS_GD_P (tls_type))
3371 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
3372 else if (! GOT_TLS_GDESC_P (tls_type)
3373 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3374 && !resolved_to_zero)
3375 || h->root.type != bfd_link_hash_undefweak)
3376 && (bfd_link_pic (info)
3377 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
3378 htab->elf.srelgot->size += bed->s->sizeof_rela;
3379 if (GOT_TLS_GDESC_P (tls_type))
3380 {
3381 htab->elf.srelplt->size += bed->s->sizeof_rela;
3382 htab->tlsdesc_plt = (bfd_vma) -1;
3383 }
3384 }
3385 else
3386 h->got.offset = (bfd_vma) -1;
3387
3388 if (eh->dyn_relocs == NULL)
3389 return TRUE;
3390
3391 /* In the shared -Bsymbolic case, discard space allocated for
3392 dynamic pc-relative relocs against symbols which turn out to be
3393 defined in regular objects. For the normal shared case, discard
3394 space for pc-relative relocs that have become local due to symbol
3395 visibility changes. */
3396
3397 if (bfd_link_pic (info))
3398 {
3399 /* Relocs that use pc_count are those that appear on a call
3400 insn, or certain REL relocs that can generated via assembly.
3401 We want calls to protected symbols to resolve directly to the
3402 function rather than going via the plt. If people want
3403 function pointer comparisons to work as expected then they
3404 should avoid writing weird assembly. */
3405 if (SYMBOL_CALLS_LOCAL (info, h))
3406 {
3407 struct elf_dyn_relocs **pp;
3408
3409 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
3410 {
3411 p->count -= p->pc_count;
3412 p->pc_count = 0;
3413 if (p->count == 0)
3414 *pp = p->next;
3415 else
3416 pp = &p->next;
3417 }
3418 }
3419
3420 /* Also discard relocs on undefined weak syms with non-default
3421 visibility or in PIE. */
3422 if (eh->dyn_relocs != NULL)
3423 {
3424 if (h->root.type == bfd_link_hash_undefweak)
3425 {
3426 /* Undefined weak symbol is never bound locally in shared
3427 library. */
3428 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
3429 || resolved_to_zero)
3430 eh->dyn_relocs = NULL;
3431 else if (h->dynindx == -1
3432 && ! h->forced_local
3433 && ! bfd_elf_link_record_dynamic_symbol (info, h))
3434 return FALSE;
3435 }
3436 /* For PIE, discard space for pc-relative relocs against
3437 symbols which turn out to need copy relocs. */
3438 else if (bfd_link_executable (info)
3439 && (h->needs_copy || eh->needs_copy)
3440 && h->def_dynamic
3441 && !h->def_regular)
3442 {
3443 struct elf_dyn_relocs **pp;
3444
3445 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
3446 {
3447 if (p->pc_count != 0)
3448 *pp = p->next;
3449 else
3450 pp = &p->next;
3451 }
3452 }
3453 }
3454 }
3455 else if (ELIMINATE_COPY_RELOCS)
3456 {
3457 /* For the non-shared case, discard space for relocs against
3458 symbols which turn out to need copy relocs or are not
3459 dynamic. Keep dynamic relocations for run-time function
3460 pointer initialization. */
3461
3462 if ((!h->non_got_ref
3463 || eh->func_pointer_refcount > 0
3464 || (h->root.type == bfd_link_hash_undefweak
3465 && !resolved_to_zero))
3466 && ((h->def_dynamic
3467 && !h->def_regular)
3468 || (htab->elf.dynamic_sections_created
3469 && (h->root.type == bfd_link_hash_undefweak
3470 || h->root.type == bfd_link_hash_undefined))))
3471 {
3472 /* Make sure this symbol is output as a dynamic symbol.
3473 Undefined weak syms won't yet be marked as dynamic. */
3474 if (h->dynindx == -1
3475 && ! h->forced_local
3476 && ! resolved_to_zero
3477 && ! bfd_elf_link_record_dynamic_symbol (info, h))
3478 return FALSE;
3479
3480 /* If that succeeded, we know we'll be keeping all the
3481 relocs. */
3482 if (h->dynindx != -1)
3483 goto keep;
3484 }
3485
3486 eh->dyn_relocs = NULL;
3487 eh->func_pointer_refcount = 0;
3488
3489 keep: ;
3490 }
3491
3492 /* Finally, allocate space. */
3493 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3494 {
3495 asection * sreloc;
3496
3497 sreloc = elf_section_data (p->sec)->sreloc;
3498
3499 BFD_ASSERT (sreloc != NULL);
3500
3501 sreloc->size += p->count * bed->s->sizeof_rela;
3502 }
3503
3504 return TRUE;
3505 }
3506
3507 /* Allocate space in .plt, .got and associated reloc sections for
3508 local dynamic relocs. */
3509
3510 static bfd_boolean
3511 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
3512 {
3513 struct elf_link_hash_entry *h
3514 = (struct elf_link_hash_entry *) *slot;
3515
3516 if (h->type != STT_GNU_IFUNC
3517 || !h->def_regular
3518 || !h->ref_regular
3519 || !h->forced_local
3520 || h->root.type != bfd_link_hash_defined)
3521 abort ();
3522
3523 return elf_x86_64_allocate_dynrelocs (h, inf);
3524 }
3525
3526 /* Find any dynamic relocs that apply to read-only sections. */
3527
3528 static bfd_boolean
3529 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
3530 void * inf)
3531 {
3532 struct elf_x86_64_link_hash_entry *eh;
3533 struct elf_dyn_relocs *p;
3534
3535 /* Skip local IFUNC symbols. */
3536 if (h->forced_local && h->type == STT_GNU_IFUNC)
3537 return TRUE;
3538
3539 eh = (struct elf_x86_64_link_hash_entry *) h;
3540 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3541 {
3542 asection *s = p->sec->output_section;
3543
3544 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3545 {
3546 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3547
3548 info->flags |= DF_TEXTREL;
3549
3550 if ((info->warn_shared_textrel && bfd_link_pic (info))
3551 || info->error_textrel)
3552 /* xgettext:c-format */
3553 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3554 p->sec->owner, h->root.root.string,
3555 p->sec);
3556
3557 /* Not an error, just cut short the traversal. */
3558 return FALSE;
3559 }
3560 }
3561 return TRUE;
3562 }
3563
3564 /* Convert load via the GOT slot to load immediate. */
3565
3566 static bfd_boolean
3567 elf_x86_64_convert_load (bfd *abfd, asection *sec,
3568 struct bfd_link_info *link_info)
3569 {
3570 Elf_Internal_Shdr *symtab_hdr;
3571 Elf_Internal_Rela *internal_relocs;
3572 Elf_Internal_Rela *irel, *irelend;
3573 bfd_byte *contents;
3574 struct elf_x86_64_link_hash_table *htab;
3575 bfd_boolean changed;
3576 bfd_signed_vma *local_got_refcounts;
3577
3578 /* Don't even try to convert non-ELF outputs. */
3579 if (!is_elf_hash_table (link_info->hash))
3580 return FALSE;
3581
3582 /* Nothing to do if there is no need or no output. */
3583 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3584 || sec->need_convert_load == 0
3585 || bfd_is_abs_section (sec->output_section))
3586 return TRUE;
3587
3588 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3589
3590 /* Load the relocations for this section. */
3591 internal_relocs = (_bfd_elf_link_read_relocs
3592 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3593 link_info->keep_memory));
3594 if (internal_relocs == NULL)
3595 return FALSE;
3596
3597 changed = FALSE;
3598 htab = elf_x86_64_hash_table (link_info);
3599 local_got_refcounts = elf_local_got_refcounts (abfd);
3600
3601 /* Get the section contents. */
3602 if (elf_section_data (sec)->this_hdr.contents != NULL)
3603 contents = elf_section_data (sec)->this_hdr.contents;
3604 else
3605 {
3606 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3607 goto error_return;
3608 }
3609
3610 irelend = internal_relocs + sec->reloc_count;
3611 for (irel = internal_relocs; irel < irelend; irel++)
3612 {
3613 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3614 unsigned int r_symndx;
3615 struct elf_link_hash_entry *h;
3616 bfd_boolean converted;
3617
3618 if (r_type != R_X86_64_GOTPCRELX
3619 && r_type != R_X86_64_REX_GOTPCRELX
3620 && r_type != R_X86_64_GOTPCREL)
3621 continue;
3622
3623 r_symndx = htab->r_sym (irel->r_info);
3624 if (r_symndx < symtab_hdr->sh_info)
3625 h = elf_x86_64_get_local_sym_hash (htab, sec->owner,
3626 (const Elf_Internal_Rela *) irel,
3627 FALSE);
3628 else
3629 {
3630 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
3631 while (h->root.type == bfd_link_hash_indirect
3632 || h->root.type == bfd_link_hash_warning)
3633 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3634 }
3635
3636 /* STT_GNU_IFUNC must keep GOTPCREL relocations. */
3637 if (h != NULL && h->type == STT_GNU_IFUNC)
3638 continue;
3639
3640 converted = FALSE;
3641 if (!elf_x86_64_convert_load_reloc (abfd, sec, contents, irel, h,
3642 &converted, link_info))
3643 goto error_return;
3644
3645 if (converted)
3646 {
3647 changed = converted;
3648 if (h)
3649 {
3650 if (h->got.refcount > 0)
3651 h->got.refcount -= 1;
3652 }
3653 else
3654 {
3655 if (local_got_refcounts != NULL
3656 && local_got_refcounts[r_symndx] > 0)
3657 local_got_refcounts[r_symndx] -= 1;
3658 }
3659 }
3660 }
3661
3662 if (contents != NULL
3663 && elf_section_data (sec)->this_hdr.contents != contents)
3664 {
3665 if (!changed && !link_info->keep_memory)
3666 free (contents);
3667 else
3668 {
3669 /* Cache the section contents for elf_link_input_bfd. */
3670 elf_section_data (sec)->this_hdr.contents = contents;
3671 }
3672 }
3673
3674 if (elf_section_data (sec)->relocs != internal_relocs)
3675 {
3676 if (!changed)
3677 free (internal_relocs);
3678 else
3679 elf_section_data (sec)->relocs = internal_relocs;
3680 }
3681
3682 return TRUE;
3683
3684 error_return:
3685 if (contents != NULL
3686 && elf_section_data (sec)->this_hdr.contents != contents)
3687 free (contents);
3688 if (internal_relocs != NULL
3689 && elf_section_data (sec)->relocs != internal_relocs)
3690 free (internal_relocs);
3691 return FALSE;
3692 }
3693
3694 /* Set the sizes of the dynamic sections. */
3695
3696 static bfd_boolean
3697 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3698 struct bfd_link_info *info)
3699 {
3700 struct elf_x86_64_link_hash_table *htab;
3701 bfd *dynobj;
3702 asection *s;
3703 bfd_boolean relocs;
3704 bfd *ibfd;
3705 const struct elf_backend_data *bed;
3706 const struct elf_x86_64_backend_data *arch_data;
3707
3708 htab = elf_x86_64_hash_table (info);
3709 if (htab == NULL)
3710 return FALSE;
3711 bed = get_elf_backend_data (output_bfd);
3712
3713 dynobj = htab->elf.dynobj;
3714 if (dynobj == NULL)
3715 abort ();
3716
3717 /* Set up .got offsets for local syms, and space for local dynamic
3718 relocs. */
3719 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3720 {
3721 bfd_signed_vma *local_got;
3722 bfd_signed_vma *end_local_got;
3723 char *local_tls_type;
3724 bfd_vma *local_tlsdesc_gotent;
3725 bfd_size_type locsymcount;
3726 Elf_Internal_Shdr *symtab_hdr;
3727 asection *srel;
3728
3729 if (! is_x86_64_elf (ibfd))
3730 continue;
3731
3732 for (s = ibfd->sections; s != NULL; s = s->next)
3733 {
3734 struct elf_dyn_relocs *p;
3735
3736 if (!elf_x86_64_convert_load (ibfd, s, info))
3737 return FALSE;
3738
3739 for (p = (struct elf_dyn_relocs *)
3740 (elf_section_data (s)->local_dynrel);
3741 p != NULL;
3742 p = p->next)
3743 {
3744 if (!bfd_is_abs_section (p->sec)
3745 && bfd_is_abs_section (p->sec->output_section))
3746 {
3747 /* Input section has been discarded, either because
3748 it is a copy of a linkonce section or due to
3749 linker script /DISCARD/, so we'll be discarding
3750 the relocs too. */
3751 }
3752 else if (p->count != 0)
3753 {
3754 srel = elf_section_data (p->sec)->sreloc;
3755 srel->size += p->count * bed->s->sizeof_rela;
3756 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3757 && (info->flags & DF_TEXTREL) == 0)
3758 {
3759 info->flags |= DF_TEXTREL;
3760 if ((info->warn_shared_textrel && bfd_link_pic (info))
3761 || info->error_textrel)
3762 /* xgettext:c-format */
3763 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3764 p->sec->owner, p->sec);
3765 }
3766 }
3767 }
3768 }
3769
3770 local_got = elf_local_got_refcounts (ibfd);
3771 if (!local_got)
3772 continue;
3773
3774 symtab_hdr = &elf_symtab_hdr (ibfd);
3775 locsymcount = symtab_hdr->sh_info;
3776 end_local_got = local_got + locsymcount;
3777 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3778 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3779 s = htab->elf.sgot;
3780 srel = htab->elf.srelgot;
3781 for (; local_got < end_local_got;
3782 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3783 {
3784 *local_tlsdesc_gotent = (bfd_vma) -1;
3785 if (*local_got > 0)
3786 {
3787 if (GOT_TLS_GDESC_P (*local_tls_type))
3788 {
3789 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3790 - elf_x86_64_compute_jump_table_size (htab);
3791 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3792 *local_got = (bfd_vma) -2;
3793 }
3794 if (! GOT_TLS_GDESC_P (*local_tls_type)
3795 || GOT_TLS_GD_P (*local_tls_type))
3796 {
3797 *local_got = s->size;
3798 s->size += GOT_ENTRY_SIZE;
3799 if (GOT_TLS_GD_P (*local_tls_type))
3800 s->size += GOT_ENTRY_SIZE;
3801 }
3802 if (bfd_link_pic (info)
3803 || GOT_TLS_GD_ANY_P (*local_tls_type)
3804 || *local_tls_type == GOT_TLS_IE)
3805 {
3806 if (GOT_TLS_GDESC_P (*local_tls_type))
3807 {
3808 htab->elf.srelplt->size
3809 += bed->s->sizeof_rela;
3810 htab->tlsdesc_plt = (bfd_vma) -1;
3811 }
3812 if (! GOT_TLS_GDESC_P (*local_tls_type)
3813 || GOT_TLS_GD_P (*local_tls_type))
3814 srel->size += bed->s->sizeof_rela;
3815 }
3816 }
3817 else
3818 *local_got = (bfd_vma) -1;
3819 }
3820 }
3821
3822 if (htab->tls_ld_got.refcount > 0)
3823 {
3824 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3825 relocs. */
3826 htab->tls_ld_got.offset = htab->elf.sgot->size;
3827 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3828 htab->elf.srelgot->size += bed->s->sizeof_rela;
3829 }
3830 else
3831 htab->tls_ld_got.offset = -1;
3832
3833 /* Allocate global sym .plt and .got entries, and space for global
3834 sym dynamic relocs. */
3835 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3836 info);
3837
3838 /* Allocate .plt and .got entries, and space for local symbols. */
3839 htab_traverse (htab->loc_hash_table,
3840 elf_x86_64_allocate_local_dynrelocs,
3841 info);
3842
3843 /* For every jump slot reserved in the sgotplt, reloc_count is
3844 incremented. However, when we reserve space for TLS descriptors,
3845 it's not incremented, so in order to compute the space reserved
3846 for them, it suffices to multiply the reloc count by the jump
3847 slot size.
3848
3849 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3850 so that R_X86_64_IRELATIVE entries come last. */
3851 if (htab->elf.srelplt)
3852 {
3853 htab->sgotplt_jump_table_size
3854 = elf_x86_64_compute_jump_table_size (htab);
3855 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3856 }
3857 else if (htab->elf.irelplt)
3858 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3859
3860 if (htab->tlsdesc_plt)
3861 {
3862 /* If we're not using lazy TLS relocations, don't generate the
3863 PLT and GOT entries they require. */
3864 if ((info->flags & DF_BIND_NOW))
3865 htab->tlsdesc_plt = 0;
3866 else
3867 {
3868 htab->tlsdesc_got = htab->elf.sgot->size;
3869 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3870 /* Reserve room for the initial entry.
3871 FIXME: we could probably do away with it in this case. */
3872 if (htab->elf.splt->size == 0)
3873 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3874 htab->tlsdesc_plt = htab->elf.splt->size;
3875 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3876 }
3877 }
3878
3879 if (htab->elf.sgotplt)
3880 {
3881 /* Don't allocate .got.plt section if there are no GOT nor PLT
3882 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3883 if ((htab->elf.hgot == NULL
3884 || !htab->elf.hgot->ref_regular_nonweak)
3885 && (htab->elf.sgotplt->size
3886 == get_elf_backend_data (output_bfd)->got_header_size)
3887 && (htab->elf.splt == NULL
3888 || htab->elf.splt->size == 0)
3889 && (htab->elf.sgot == NULL
3890 || htab->elf.sgot->size == 0)
3891 && (htab->elf.iplt == NULL
3892 || htab->elf.iplt->size == 0)
3893 && (htab->elf.igotplt == NULL
3894 || htab->elf.igotplt->size == 0))
3895 htab->elf.sgotplt->size = 0;
3896 }
3897
3898 arch_data = (htab->plt_bnd != NULL
3899 ? &elf_x86_64_bnd_arch_bed
3900 : get_elf_x86_64_arch_data (bed));
3901
3902 if (_bfd_elf_eh_frame_present (info))
3903 {
3904 if (htab->plt_eh_frame != NULL
3905 && htab->elf.splt != NULL
3906 && htab->elf.splt->size != 0
3907 && !bfd_is_abs_section (htab->elf.splt->output_section))
3908 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
3909
3910 if (htab->plt_got_eh_frame != NULL
3911 && htab->plt_got != NULL
3912 && htab->plt_got->size != 0
3913 && !bfd_is_abs_section (htab->plt_got->output_section))
3914 htab->plt_got_eh_frame->size = arch_data->eh_frame_plt_got_size;
3915
3916 /* Unwind info for .plt.bnd and .plt.got sections are
3917 identical. */
3918 if (htab->plt_bnd_eh_frame != NULL
3919 && htab->plt_bnd != NULL
3920 && htab->plt_bnd->size != 0
3921 && !bfd_is_abs_section (htab->plt_bnd->output_section))
3922 htab->plt_bnd_eh_frame->size = arch_data->eh_frame_plt_got_size;
3923 }
3924
3925 /* We now have determined the sizes of the various dynamic sections.
3926 Allocate memory for them. */
3927 relocs = FALSE;
3928 for (s = dynobj->sections; s != NULL; s = s->next)
3929 {
3930 if ((s->flags & SEC_LINKER_CREATED) == 0)
3931 continue;
3932
3933 if (s == htab->elf.splt
3934 || s == htab->elf.sgot
3935 || s == htab->elf.sgotplt
3936 || s == htab->elf.iplt
3937 || s == htab->elf.igotplt
3938 || s == htab->plt_bnd
3939 || s == htab->plt_got
3940 || s == htab->plt_eh_frame
3941 || s == htab->plt_got_eh_frame
3942 || s == htab->plt_bnd_eh_frame
3943 || s == htab->elf.sdynbss
3944 || s == htab->elf.sdynrelro)
3945 {
3946 /* Strip this section if we don't need it; see the
3947 comment below. */
3948 }
3949 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3950 {
3951 if (s->size != 0 && s != htab->elf.srelplt)
3952 relocs = TRUE;
3953
3954 /* We use the reloc_count field as a counter if we need
3955 to copy relocs into the output file. */
3956 if (s != htab->elf.srelplt)
3957 s->reloc_count = 0;
3958 }
3959 else
3960 {
3961 /* It's not one of our sections, so don't allocate space. */
3962 continue;
3963 }
3964
3965 if (s->size == 0)
3966 {
3967 /* If we don't need this section, strip it from the
3968 output file. This is mostly to handle .rela.bss and
3969 .rela.plt. We must create both sections in
3970 create_dynamic_sections, because they must be created
3971 before the linker maps input sections to output
3972 sections. The linker does that before
3973 adjust_dynamic_symbol is called, and it is that
3974 function which decides whether anything needs to go
3975 into these sections. */
3976
3977 s->flags |= SEC_EXCLUDE;
3978 continue;
3979 }
3980
3981 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3982 continue;
3983
3984 /* Allocate memory for the section contents. We use bfd_zalloc
3985 here in case unused entries are not reclaimed before the
3986 section's contents are written out. This should not happen,
3987 but this way if it does, we get a R_X86_64_NONE reloc instead
3988 of garbage. */
3989 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3990 if (s->contents == NULL)
3991 return FALSE;
3992 }
3993
3994 if (htab->plt_eh_frame != NULL
3995 && htab->plt_eh_frame->contents != NULL)
3996 {
3997 memcpy (htab->plt_eh_frame->contents,
3998 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3999 bfd_put_32 (dynobj, htab->elf.splt->size,
4000 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
4001 }
4002
4003 if (htab->plt_got_eh_frame != NULL
4004 && htab->plt_got_eh_frame->contents != NULL)
4005 {
4006 memcpy (htab->plt_got_eh_frame->contents,
4007 arch_data->eh_frame_plt_got,
4008 htab->plt_got_eh_frame->size);
4009 bfd_put_32 (dynobj, htab->plt_got->size,
4010 (htab->plt_got_eh_frame->contents
4011 + PLT_FDE_LEN_OFFSET));
4012 }
4013
4014 if (htab->plt_bnd_eh_frame != NULL
4015 && htab->plt_bnd_eh_frame->contents != NULL)
4016 {
4017 memcpy (htab->plt_bnd_eh_frame->contents,
4018 arch_data->eh_frame_plt_got,
4019 htab->plt_bnd_eh_frame->size);
4020 bfd_put_32 (dynobj, htab->plt_bnd->size,
4021 (htab->plt_bnd_eh_frame->contents
4022 + PLT_FDE_LEN_OFFSET));
4023 }
4024
4025 if (htab->elf.dynamic_sections_created)
4026 {
4027 /* Add some entries to the .dynamic section. We fill in the
4028 values later, in elf_x86_64_finish_dynamic_sections, but we
4029 must add the entries now so that we get the correct size for
4030 the .dynamic section. The DT_DEBUG entry is filled in by the
4031 dynamic linker and used by the debugger. */
4032 #define add_dynamic_entry(TAG, VAL) \
4033 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
4034
4035 if (bfd_link_executable (info))
4036 {
4037 if (!add_dynamic_entry (DT_DEBUG, 0))
4038 return FALSE;
4039 }
4040
4041 if (htab->elf.splt->size != 0)
4042 {
4043 /* DT_PLTGOT is used by prelink even if there is no PLT
4044 relocation. */
4045 if (!add_dynamic_entry (DT_PLTGOT, 0))
4046 return FALSE;
4047
4048 if (htab->elf.srelplt->size != 0)
4049 {
4050 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
4051 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
4052 || !add_dynamic_entry (DT_JMPREL, 0))
4053 return FALSE;
4054 }
4055
4056 if (htab->tlsdesc_plt
4057 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
4058 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
4059 return FALSE;
4060 }
4061
4062 if (relocs)
4063 {
4064 if (!add_dynamic_entry (DT_RELA, 0)
4065 || !add_dynamic_entry (DT_RELASZ, 0)
4066 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
4067 return FALSE;
4068
4069 /* If any dynamic relocs apply to a read-only section,
4070 then we need a DT_TEXTREL entry. */
4071 if ((info->flags & DF_TEXTREL) == 0)
4072 elf_link_hash_traverse (&htab->elf,
4073 elf_x86_64_readonly_dynrelocs,
4074 info);
4075
4076 if ((info->flags & DF_TEXTREL) != 0)
4077 {
4078 if (htab->readonly_dynrelocs_against_ifunc)
4079 {
4080 info->callbacks->einfo
4081 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
4082 bfd_set_error (bfd_error_bad_value);
4083 return FALSE;
4084 }
4085
4086 if (!add_dynamic_entry (DT_TEXTREL, 0))
4087 return FALSE;
4088 }
4089 }
4090 }
4091 #undef add_dynamic_entry
4092
4093 return TRUE;
4094 }
4095
4096 static bfd_boolean
4097 elf_x86_64_always_size_sections (bfd *output_bfd,
4098 struct bfd_link_info *info)
4099 {
4100 asection *tls_sec = elf_hash_table (info)->tls_sec;
4101
4102 if (tls_sec)
4103 {
4104 struct elf_link_hash_entry *tlsbase;
4105
4106 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
4107 "_TLS_MODULE_BASE_",
4108 FALSE, FALSE, FALSE);
4109
4110 if (tlsbase && tlsbase->type == STT_TLS)
4111 {
4112 struct elf_x86_64_link_hash_table *htab;
4113 struct bfd_link_hash_entry *bh = NULL;
4114 const struct elf_backend_data *bed
4115 = get_elf_backend_data (output_bfd);
4116
4117 htab = elf_x86_64_hash_table (info);
4118 if (htab == NULL)
4119 return FALSE;
4120
4121 if (!(_bfd_generic_link_add_one_symbol
4122 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
4123 tls_sec, 0, NULL, FALSE,
4124 bed->collect, &bh)))
4125 return FALSE;
4126
4127 htab->tls_module_base = bh;
4128
4129 tlsbase = (struct elf_link_hash_entry *)bh;
4130 tlsbase->def_regular = 1;
4131 tlsbase->other = STV_HIDDEN;
4132 tlsbase->root.linker_def = 1;
4133 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
4134 }
4135 }
4136
4137 return TRUE;
4138 }
4139
4140 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
4141 executables. Rather than setting it to the beginning of the TLS
4142 section, we have to set it to the end. This function may be called
4143 multiple times, it is idempotent. */
4144
4145 static void
4146 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
4147 {
4148 struct elf_x86_64_link_hash_table *htab;
4149 struct bfd_link_hash_entry *base;
4150
4151 if (!bfd_link_executable (info))
4152 return;
4153
4154 htab = elf_x86_64_hash_table (info);
4155 if (htab == NULL)
4156 return;
4157
4158 base = htab->tls_module_base;
4159 if (base == NULL)
4160 return;
4161
4162 base->u.def.value = htab->elf.tls_size;
4163 }
4164
4165 /* Return the base VMA address which should be subtracted from real addresses
4166 when resolving @dtpoff relocation.
4167 This is PT_TLS segment p_vaddr. */
4168
4169 static bfd_vma
4170 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
4171 {
4172 /* If tls_sec is NULL, we should have signalled an error already. */
4173 if (elf_hash_table (info)->tls_sec == NULL)
4174 return 0;
4175 return elf_hash_table (info)->tls_sec->vma;
4176 }
4177
4178 /* Return the relocation value for @tpoff relocation
4179 if STT_TLS virtual address is ADDRESS. */
4180
4181 static bfd_vma
4182 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
4183 {
4184 struct elf_link_hash_table *htab = elf_hash_table (info);
4185 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
4186 bfd_vma static_tls_size;
4187
4188 /* If tls_segment is NULL, we should have signalled an error already. */
4189 if (htab->tls_sec == NULL)
4190 return 0;
4191
4192 /* Consider special static TLS alignment requirements. */
4193 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
4194 return address - static_tls_size - htab->tls_sec->vma;
4195 }
4196
4197 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
4198 branch? */
4199
4200 static bfd_boolean
4201 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
4202 {
4203 /* Opcode Instruction
4204 0xe8 call
4205 0xe9 jump
4206 0x0f 0x8x conditional jump */
4207 return ((offset > 0
4208 && (contents [offset - 1] == 0xe8
4209 || contents [offset - 1] == 0xe9))
4210 || (offset > 1
4211 && contents [offset - 2] == 0x0f
4212 && (contents [offset - 1] & 0xf0) == 0x80));
4213 }
4214
4215 /* Relocate an x86_64 ELF section. */
4216
4217 static bfd_boolean
4218 elf_x86_64_relocate_section (bfd *output_bfd,
4219 struct bfd_link_info *info,
4220 bfd *input_bfd,
4221 asection *input_section,
4222 bfd_byte *contents,
4223 Elf_Internal_Rela *relocs,
4224 Elf_Internal_Sym *local_syms,
4225 asection **local_sections)
4226 {
4227 struct elf_x86_64_link_hash_table *htab;
4228 Elf_Internal_Shdr *symtab_hdr;
4229 struct elf_link_hash_entry **sym_hashes;
4230 bfd_vma *local_got_offsets;
4231 bfd_vma *local_tlsdesc_gotents;
4232 Elf_Internal_Rela *rel;
4233 Elf_Internal_Rela *wrel;
4234 Elf_Internal_Rela *relend;
4235 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
4236
4237 BFD_ASSERT (is_x86_64_elf (input_bfd));
4238
4239 /* Skip if check_relocs failed. */
4240 if (input_section->check_relocs_failed)
4241 return FALSE;
4242
4243 htab = elf_x86_64_hash_table (info);
4244 if (htab == NULL)
4245 return FALSE;
4246 symtab_hdr = &elf_symtab_hdr (input_bfd);
4247 sym_hashes = elf_sym_hashes (input_bfd);
4248 local_got_offsets = elf_local_got_offsets (input_bfd);
4249 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
4250
4251 elf_x86_64_set_tls_module_base (info);
4252
4253 rel = wrel = relocs;
4254 relend = relocs + input_section->reloc_count;
4255 for (; rel < relend; wrel++, rel++)
4256 {
4257 unsigned int r_type;
4258 reloc_howto_type *howto;
4259 unsigned long r_symndx;
4260 struct elf_link_hash_entry *h;
4261 struct elf_x86_64_link_hash_entry *eh;
4262 Elf_Internal_Sym *sym;
4263 asection *sec;
4264 bfd_vma off, offplt, plt_offset;
4265 bfd_vma relocation;
4266 bfd_boolean unresolved_reloc;
4267 bfd_reloc_status_type r;
4268 int tls_type;
4269 asection *base_got, *resolved_plt;
4270 bfd_vma st_size;
4271 bfd_boolean resolved_to_zero;
4272
4273 r_type = ELF32_R_TYPE (rel->r_info);
4274 if (r_type == (int) R_X86_64_GNU_VTINHERIT
4275 || r_type == (int) R_X86_64_GNU_VTENTRY)
4276 {
4277 if (wrel != rel)
4278 *wrel = *rel;
4279 continue;
4280 }
4281
4282 if (r_type >= (int) R_X86_64_standard)
4283 {
4284 _bfd_error_handler
4285 /* xgettext:c-format */
4286 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
4287 input_bfd, input_section, r_type);
4288 bfd_set_error (bfd_error_bad_value);
4289 return FALSE;
4290 }
4291
4292 if (r_type != (int) R_X86_64_32
4293 || ABI_64_P (output_bfd))
4294 howto = x86_64_elf_howto_table + r_type;
4295 else
4296 howto = (x86_64_elf_howto_table
4297 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
4298 r_symndx = htab->r_sym (rel->r_info);
4299 h = NULL;
4300 sym = NULL;
4301 sec = NULL;
4302 unresolved_reloc = FALSE;
4303 if (r_symndx < symtab_hdr->sh_info)
4304 {
4305 sym = local_syms + r_symndx;
4306 sec = local_sections[r_symndx];
4307
4308 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
4309 &sec, rel);
4310 st_size = sym->st_size;
4311
4312 /* Relocate against local STT_GNU_IFUNC symbol. */
4313 if (!bfd_link_relocatable (info)
4314 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4315 {
4316 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
4317 rel, FALSE);
4318 if (h == NULL)
4319 abort ();
4320
4321 /* Set STT_GNU_IFUNC symbol value. */
4322 h->root.u.def.value = sym->st_value;
4323 h->root.u.def.section = sec;
4324 }
4325 }
4326 else
4327 {
4328 bfd_boolean warned ATTRIBUTE_UNUSED;
4329 bfd_boolean ignored ATTRIBUTE_UNUSED;
4330
4331 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
4332 r_symndx, symtab_hdr, sym_hashes,
4333 h, sec, relocation,
4334 unresolved_reloc, warned, ignored);
4335 st_size = h->size;
4336 }
4337
4338 if (sec != NULL && discarded_section (sec))
4339 {
4340 _bfd_clear_contents (howto, input_bfd, input_section,
4341 contents + rel->r_offset);
4342 wrel->r_offset = rel->r_offset;
4343 wrel->r_info = 0;
4344 wrel->r_addend = 0;
4345
4346 /* For ld -r, remove relocations in debug sections against
4347 sections defined in discarded sections. Not done for
4348 eh_frame editing code expects to be present. */
4349 if (bfd_link_relocatable (info)
4350 && (input_section->flags & SEC_DEBUGGING))
4351 wrel--;
4352
4353 continue;
4354 }
4355
4356 if (bfd_link_relocatable (info))
4357 {
4358 if (wrel != rel)
4359 *wrel = *rel;
4360 continue;
4361 }
4362
4363 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
4364 {
4365 if (r_type == R_X86_64_64)
4366 {
4367 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
4368 zero-extend it to 64bit if addend is zero. */
4369 r_type = R_X86_64_32;
4370 memset (contents + rel->r_offset + 4, 0, 4);
4371 }
4372 else if (r_type == R_X86_64_SIZE64)
4373 {
4374 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
4375 zero-extend it to 64bit if addend is zero. */
4376 r_type = R_X86_64_SIZE32;
4377 memset (contents + rel->r_offset + 4, 0, 4);
4378 }
4379 }
4380
4381 eh = (struct elf_x86_64_link_hash_entry *) h;
4382
4383 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4384 it here if it is defined in a non-shared object. */
4385 if (h != NULL
4386 && h->type == STT_GNU_IFUNC
4387 && h->def_regular)
4388 {
4389 bfd_vma plt_index;
4390 const char *name;
4391
4392 if ((input_section->flags & SEC_ALLOC) == 0)
4393 {
4394 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4395 sections because such sections are not SEC_ALLOC and
4396 thus ld.so will not process them. */
4397 if ((input_section->flags & SEC_DEBUGGING) != 0)
4398 continue;
4399 abort ();
4400 }
4401
4402 switch (r_type)
4403 {
4404 default:
4405 break;
4406
4407 case R_X86_64_GOTPCREL:
4408 case R_X86_64_GOTPCRELX:
4409 case R_X86_64_REX_GOTPCRELX:
4410 case R_X86_64_GOTPCREL64:
4411 base_got = htab->elf.sgot;
4412 off = h->got.offset;
4413
4414 if (base_got == NULL)
4415 abort ();
4416
4417 if (off == (bfd_vma) -1)
4418 {
4419 /* We can't use h->got.offset here to save state, or
4420 even just remember the offset, as finish_dynamic_symbol
4421 would use that as offset into .got. */
4422
4423 if (h->plt.offset == (bfd_vma) -1)
4424 abort ();
4425
4426 if (htab->elf.splt != NULL)
4427 {
4428 plt_index = h->plt.offset / plt_entry_size - 1;
4429 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4430 base_got = htab->elf.sgotplt;
4431 }
4432 else
4433 {
4434 plt_index = h->plt.offset / plt_entry_size;
4435 off = plt_index * GOT_ENTRY_SIZE;
4436 base_got = htab->elf.igotplt;
4437 }
4438
4439 if (h->dynindx == -1
4440 || h->forced_local
4441 || info->symbolic)
4442 {
4443 /* This references the local defitionion. We must
4444 initialize this entry in the global offset table.
4445 Since the offset must always be a multiple of 8,
4446 we use the least significant bit to record
4447 whether we have initialized it already.
4448
4449 When doing a dynamic link, we create a .rela.got
4450 relocation entry to initialize the value. This
4451 is done in the finish_dynamic_symbol routine. */
4452 if ((off & 1) != 0)
4453 off &= ~1;
4454 else
4455 {
4456 bfd_put_64 (output_bfd, relocation,
4457 base_got->contents + off);
4458 /* Note that this is harmless for the GOTPLT64
4459 case, as -1 | 1 still is -1. */
4460 h->got.offset |= 1;
4461 }
4462 }
4463 }
4464
4465 relocation = (base_got->output_section->vma
4466 + base_got->output_offset + off);
4467
4468 goto do_relocation;
4469 }
4470
4471 if (h->plt.offset == (bfd_vma) -1)
4472 {
4473 /* Handle static pointers of STT_GNU_IFUNC symbols. */
4474 if (r_type == htab->pointer_r_type
4475 && (input_section->flags & SEC_CODE) == 0)
4476 goto do_ifunc_pointer;
4477 goto bad_ifunc_reloc;
4478 }
4479
4480 /* STT_GNU_IFUNC symbol must go through PLT. */
4481 if (htab->elf.splt != NULL)
4482 {
4483 if (htab->plt_bnd != NULL)
4484 {
4485 resolved_plt = htab->plt_bnd;
4486 plt_offset = eh->plt_bnd.offset;
4487 }
4488 else
4489 {
4490 resolved_plt = htab->elf.splt;
4491 plt_offset = h->plt.offset;
4492 }
4493 }
4494 else
4495 {
4496 resolved_plt = htab->elf.iplt;
4497 plt_offset = h->plt.offset;
4498 }
4499
4500 relocation = (resolved_plt->output_section->vma
4501 + resolved_plt->output_offset + plt_offset);
4502
4503 switch (r_type)
4504 {
4505 default:
4506 bad_ifunc_reloc:
4507 if (h->root.root.string)
4508 name = h->root.root.string;
4509 else
4510 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4511 NULL);
4512 _bfd_error_handler
4513 /* xgettext:c-format */
4514 (_("%B: relocation %s against STT_GNU_IFUNC "
4515 "symbol `%s' isn't supported"), input_bfd,
4516 howto->name, name);
4517 bfd_set_error (bfd_error_bad_value);
4518 return FALSE;
4519
4520 case R_X86_64_32S:
4521 if (bfd_link_pic (info))
4522 abort ();
4523 goto do_relocation;
4524
4525 case R_X86_64_32:
4526 if (ABI_64_P (output_bfd))
4527 goto do_relocation;
4528 /* FALLTHROUGH */
4529 case R_X86_64_64:
4530 do_ifunc_pointer:
4531 if (rel->r_addend != 0)
4532 {
4533 if (h->root.root.string)
4534 name = h->root.root.string;
4535 else
4536 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4537 sym, NULL);
4538 _bfd_error_handler
4539 /* xgettext:c-format */
4540 (_("%B: relocation %s against STT_GNU_IFUNC "
4541 "symbol `%s' has non-zero addend: %d"),
4542 input_bfd, howto->name, name, rel->r_addend);
4543 bfd_set_error (bfd_error_bad_value);
4544 return FALSE;
4545 }
4546
4547 /* Generate dynamic relcoation only when there is a
4548 non-GOT reference in a shared object or there is no
4549 PLT. */
4550 if ((bfd_link_pic (info) && h->non_got_ref)
4551 || h->plt.offset == (bfd_vma) -1)
4552 {
4553 Elf_Internal_Rela outrel;
4554 asection *sreloc;
4555
4556 /* Need a dynamic relocation to get the real function
4557 address. */
4558 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
4559 info,
4560 input_section,
4561 rel->r_offset);
4562 if (outrel.r_offset == (bfd_vma) -1
4563 || outrel.r_offset == (bfd_vma) -2)
4564 abort ();
4565
4566 outrel.r_offset += (input_section->output_section->vma
4567 + input_section->output_offset);
4568
4569 if (h->dynindx == -1
4570 || h->forced_local
4571 || bfd_link_executable (info))
4572 {
4573 /* This symbol is resolved locally. */
4574 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4575 outrel.r_addend = (h->root.u.def.value
4576 + h->root.u.def.section->output_section->vma
4577 + h->root.u.def.section->output_offset);
4578 }
4579 else
4580 {
4581 outrel.r_info = htab->r_info (h->dynindx, r_type);
4582 outrel.r_addend = 0;
4583 }
4584
4585 /* Dynamic relocations are stored in
4586 1. .rela.ifunc section in PIC object.
4587 2. .rela.got section in dynamic executable.
4588 3. .rela.iplt section in static executable. */
4589 if (bfd_link_pic (info))
4590 sreloc = htab->elf.irelifunc;
4591 else if (htab->elf.splt != NULL)
4592 sreloc = htab->elf.srelgot;
4593 else
4594 sreloc = htab->elf.irelplt;
4595 elf_append_rela (output_bfd, sreloc, &outrel);
4596
4597 /* If this reloc is against an external symbol, we
4598 do not want to fiddle with the addend. Otherwise,
4599 we need to include the symbol value so that it
4600 becomes an addend for the dynamic reloc. For an
4601 internal symbol, we have updated addend. */
4602 continue;
4603 }
4604 /* FALLTHROUGH */
4605 case R_X86_64_PC32:
4606 case R_X86_64_PC32_BND:
4607 case R_X86_64_PC64:
4608 case R_X86_64_PLT32:
4609 case R_X86_64_PLT32_BND:
4610 goto do_relocation;
4611 }
4612 }
4613
4614 resolved_to_zero = (eh != NULL
4615 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
4616 eh->has_got_reloc,
4617 eh));
4618
4619 /* When generating a shared object, the relocations handled here are
4620 copied into the output file to be resolved at run time. */
4621 switch (r_type)
4622 {
4623 case R_X86_64_GOT32:
4624 case R_X86_64_GOT64:
4625 /* Relocation is to the entry for this symbol in the global
4626 offset table. */
4627 case R_X86_64_GOTPCREL:
4628 case R_X86_64_GOTPCRELX:
4629 case R_X86_64_REX_GOTPCRELX:
4630 case R_X86_64_GOTPCREL64:
4631 /* Use global offset table entry as symbol value. */
4632 case R_X86_64_GOTPLT64:
4633 /* This is obsolete and treated the the same as GOT64. */
4634 base_got = htab->elf.sgot;
4635
4636 if (htab->elf.sgot == NULL)
4637 abort ();
4638
4639 if (h != NULL)
4640 {
4641 bfd_boolean dyn;
4642
4643 off = h->got.offset;
4644 if (h->needs_plt
4645 && h->plt.offset != (bfd_vma)-1
4646 && off == (bfd_vma)-1)
4647 {
4648 /* We can't use h->got.offset here to save
4649 state, or even just remember the offset, as
4650 finish_dynamic_symbol would use that as offset into
4651 .got. */
4652 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
4653 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4654 base_got = htab->elf.sgotplt;
4655 }
4656
4657 dyn = htab->elf.dynamic_sections_created;
4658
4659 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
4660 || (bfd_link_pic (info)
4661 && SYMBOL_REFERENCES_LOCAL (info, h))
4662 || (ELF_ST_VISIBILITY (h->other)
4663 && h->root.type == bfd_link_hash_undefweak))
4664 {
4665 /* This is actually a static link, or it is a -Bsymbolic
4666 link and the symbol is defined locally, or the symbol
4667 was forced to be local because of a version file. We
4668 must initialize this entry in the global offset table.
4669 Since the offset must always be a multiple of 8, we
4670 use the least significant bit to record whether we
4671 have initialized it already.
4672
4673 When doing a dynamic link, we create a .rela.got
4674 relocation entry to initialize the value. This is
4675 done in the finish_dynamic_symbol routine. */
4676 if ((off & 1) != 0)
4677 off &= ~1;
4678 else
4679 {
4680 bfd_put_64 (output_bfd, relocation,
4681 base_got->contents + off);
4682 /* Note that this is harmless for the GOTPLT64 case,
4683 as -1 | 1 still is -1. */
4684 h->got.offset |= 1;
4685 }
4686 }
4687 else
4688 unresolved_reloc = FALSE;
4689 }
4690 else
4691 {
4692 if (local_got_offsets == NULL)
4693 abort ();
4694
4695 off = local_got_offsets[r_symndx];
4696
4697 /* The offset must always be a multiple of 8. We use
4698 the least significant bit to record whether we have
4699 already generated the necessary reloc. */
4700 if ((off & 1) != 0)
4701 off &= ~1;
4702 else
4703 {
4704 bfd_put_64 (output_bfd, relocation,
4705 base_got->contents + off);
4706
4707 if (bfd_link_pic (info))
4708 {
4709 asection *s;
4710 Elf_Internal_Rela outrel;
4711
4712 /* We need to generate a R_X86_64_RELATIVE reloc
4713 for the dynamic linker. */
4714 s = htab->elf.srelgot;
4715 if (s == NULL)
4716 abort ();
4717
4718 outrel.r_offset = (base_got->output_section->vma
4719 + base_got->output_offset
4720 + off);
4721 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4722 outrel.r_addend = relocation;
4723 elf_append_rela (output_bfd, s, &outrel);
4724 }
4725
4726 local_got_offsets[r_symndx] |= 1;
4727 }
4728 }
4729
4730 if (off >= (bfd_vma) -2)
4731 abort ();
4732
4733 relocation = base_got->output_section->vma
4734 + base_got->output_offset + off;
4735 if (r_type != R_X86_64_GOTPCREL
4736 && r_type != R_X86_64_GOTPCRELX
4737 && r_type != R_X86_64_REX_GOTPCRELX
4738 && r_type != R_X86_64_GOTPCREL64)
4739 relocation -= htab->elf.sgotplt->output_section->vma
4740 - htab->elf.sgotplt->output_offset;
4741
4742 break;
4743
4744 case R_X86_64_GOTOFF64:
4745 /* Relocation is relative to the start of the global offset
4746 table. */
4747
4748 /* Check to make sure it isn't a protected function or data
4749 symbol for shared library since it may not be local when
4750 used as function address or with copy relocation. We also
4751 need to make sure that a symbol is referenced locally. */
4752 if (bfd_link_pic (info) && h)
4753 {
4754 if (!h->def_regular)
4755 {
4756 const char *v;
4757
4758 switch (ELF_ST_VISIBILITY (h->other))
4759 {
4760 case STV_HIDDEN:
4761 v = _("hidden symbol");
4762 break;
4763 case STV_INTERNAL:
4764 v = _("internal symbol");
4765 break;
4766 case STV_PROTECTED:
4767 v = _("protected symbol");
4768 break;
4769 default:
4770 v = _("symbol");
4771 break;
4772 }
4773
4774 _bfd_error_handler
4775 /* xgettext:c-format */
4776 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4777 input_bfd, v, h->root.root.string);
4778 bfd_set_error (bfd_error_bad_value);
4779 return FALSE;
4780 }
4781 else if (!bfd_link_executable (info)
4782 && !SYMBOL_REFERENCES_LOCAL (info, h)
4783 && (h->type == STT_FUNC
4784 || h->type == STT_OBJECT)
4785 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4786 {
4787 _bfd_error_handler
4788 /* xgettext:c-format */
4789 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4790 input_bfd,
4791 h->type == STT_FUNC ? "function" : "data",
4792 h->root.root.string);
4793 bfd_set_error (bfd_error_bad_value);
4794 return FALSE;
4795 }
4796 }
4797
4798 /* Note that sgot is not involved in this
4799 calculation. We always want the start of .got.plt. If we
4800 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4801 permitted by the ABI, we might have to change this
4802 calculation. */
4803 relocation -= htab->elf.sgotplt->output_section->vma
4804 + htab->elf.sgotplt->output_offset;
4805 break;
4806
4807 case R_X86_64_GOTPC32:
4808 case R_X86_64_GOTPC64:
4809 /* Use global offset table as symbol value. */
4810 relocation = htab->elf.sgotplt->output_section->vma
4811 + htab->elf.sgotplt->output_offset;
4812 unresolved_reloc = FALSE;
4813 break;
4814
4815 case R_X86_64_PLTOFF64:
4816 /* Relocation is PLT entry relative to GOT. For local
4817 symbols it's the symbol itself relative to GOT. */
4818 if (h != NULL
4819 /* See PLT32 handling. */
4820 && (h->plt.offset != (bfd_vma) -1
4821 || eh->plt_got.offset != (bfd_vma) -1)
4822 && htab->elf.splt != NULL)
4823 {
4824 if (eh->plt_got.offset != (bfd_vma) -1)
4825 {
4826 /* Use the GOT PLT. */
4827 resolved_plt = htab->plt_got;
4828 plt_offset = eh->plt_got.offset;
4829 }
4830 else if (htab->plt_bnd != NULL)
4831 {
4832 resolved_plt = htab->plt_bnd;
4833 plt_offset = eh->plt_bnd.offset;
4834 }
4835 else
4836 {
4837 resolved_plt = htab->elf.splt;
4838 plt_offset = h->plt.offset;
4839 }
4840
4841 relocation = (resolved_plt->output_section->vma
4842 + resolved_plt->output_offset
4843 + plt_offset);
4844 unresolved_reloc = FALSE;
4845 }
4846
4847 relocation -= htab->elf.sgotplt->output_section->vma
4848 + htab->elf.sgotplt->output_offset;
4849 break;
4850
4851 case R_X86_64_PLT32:
4852 case R_X86_64_PLT32_BND:
4853 /* Relocation is to the entry for this symbol in the
4854 procedure linkage table. */
4855
4856 /* Resolve a PLT32 reloc against a local symbol directly,
4857 without using the procedure linkage table. */
4858 if (h == NULL)
4859 break;
4860
4861 if ((h->plt.offset == (bfd_vma) -1
4862 && eh->plt_got.offset == (bfd_vma) -1)
4863 || htab->elf.splt == NULL)
4864 {
4865 /* We didn't make a PLT entry for this symbol. This
4866 happens when statically linking PIC code, or when
4867 using -Bsymbolic. */
4868 break;
4869 }
4870
4871 if (h->plt.offset != (bfd_vma) -1)
4872 {
4873 if (htab->plt_bnd != NULL)
4874 {
4875 resolved_plt = htab->plt_bnd;
4876 plt_offset = eh->plt_bnd.offset;
4877 }
4878 else
4879 {
4880 resolved_plt = htab->elf.splt;
4881 plt_offset = h->plt.offset;
4882 }
4883 }
4884 else
4885 {
4886 /* Use the GOT PLT. */
4887 resolved_plt = htab->plt_got;
4888 plt_offset = eh->plt_got.offset;
4889 }
4890
4891 relocation = (resolved_plt->output_section->vma
4892 + resolved_plt->output_offset
4893 + plt_offset);
4894 unresolved_reloc = FALSE;
4895 break;
4896
4897 case R_X86_64_SIZE32:
4898 case R_X86_64_SIZE64:
4899 /* Set to symbol size. */
4900 relocation = st_size;
4901 goto direct;
4902
4903 case R_X86_64_PC8:
4904 case R_X86_64_PC16:
4905 case R_X86_64_PC32:
4906 case R_X86_64_PC32_BND:
4907 /* Don't complain about -fPIC if the symbol is undefined when
4908 building executable unless it is unresolved weak symbol. */
4909 if ((input_section->flags & SEC_ALLOC) != 0
4910 && (input_section->flags & SEC_READONLY) != 0
4911 && h != NULL
4912 && ((bfd_link_executable (info)
4913 && h->root.type == bfd_link_hash_undefweak
4914 && !resolved_to_zero)
4915 || (bfd_link_pic (info)
4916 && !(bfd_link_pie (info)
4917 && h->root.type == bfd_link_hash_undefined))))
4918 {
4919 bfd_boolean fail = FALSE;
4920 bfd_boolean branch
4921 = ((r_type == R_X86_64_PC32
4922 || r_type == R_X86_64_PC32_BND)
4923 && is_32bit_relative_branch (contents, rel->r_offset));
4924
4925 if (SYMBOL_REFERENCES_LOCAL (info, h))
4926 {
4927 /* Symbol is referenced locally. Make sure it is
4928 defined locally or for a branch. */
4929 fail = !h->def_regular && !branch;
4930 }
4931 else if (!(bfd_link_pie (info)
4932 && (h->needs_copy || eh->needs_copy)))
4933 {
4934 /* Symbol doesn't need copy reloc and isn't referenced
4935 locally. We only allow branch to symbol with
4936 non-default visibility. */
4937 fail = (!branch
4938 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4939 }
4940
4941 if (fail)
4942 return elf_x86_64_need_pic (input_bfd, input_section,
4943 h, NULL, NULL, howto);
4944 }
4945 /* Fall through. */
4946
4947 case R_X86_64_8:
4948 case R_X86_64_16:
4949 case R_X86_64_32:
4950 case R_X86_64_PC64:
4951 case R_X86_64_64:
4952 /* FIXME: The ABI says the linker should make sure the value is
4953 the same when it's zeroextended to 64 bit. */
4954
4955 direct:
4956 if ((input_section->flags & SEC_ALLOC) == 0)
4957 break;
4958
4959 /* Don't copy a pc-relative relocation into the output file
4960 if the symbol needs copy reloc or the symbol is undefined
4961 when building executable. Copy dynamic function pointer
4962 relocations. Don't generate dynamic relocations against
4963 resolved undefined weak symbols in PIE. */
4964 if ((bfd_link_pic (info)
4965 && !(bfd_link_pie (info)
4966 && h != NULL
4967 && (h->needs_copy
4968 || eh->needs_copy
4969 || h->root.type == bfd_link_hash_undefined)
4970 && (IS_X86_64_PCREL_TYPE (r_type)
4971 || r_type == R_X86_64_SIZE32
4972 || r_type == R_X86_64_SIZE64))
4973 && (h == NULL
4974 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4975 && !resolved_to_zero)
4976 || h->root.type != bfd_link_hash_undefweak))
4977 && ((! IS_X86_64_PCREL_TYPE (r_type)
4978 && r_type != R_X86_64_SIZE32
4979 && r_type != R_X86_64_SIZE64)
4980 || ! SYMBOL_CALLS_LOCAL (info, h)))
4981 || (ELIMINATE_COPY_RELOCS
4982 && !bfd_link_pic (info)
4983 && h != NULL
4984 && h->dynindx != -1
4985 && (!h->non_got_ref
4986 || eh->func_pointer_refcount > 0
4987 || (h->root.type == bfd_link_hash_undefweak
4988 && !resolved_to_zero))
4989 && ((h->def_dynamic && !h->def_regular)
4990 /* Undefined weak symbol is bound locally when
4991 PIC is false. */
4992 || h->root.type == bfd_link_hash_undefined)))
4993 {
4994 Elf_Internal_Rela outrel;
4995 bfd_boolean skip, relocate;
4996 asection *sreloc;
4997
4998 /* When generating a shared object, these relocations
4999 are copied into the output file to be resolved at run
5000 time. */
5001 skip = FALSE;
5002 relocate = FALSE;
5003
5004 outrel.r_offset =
5005 _bfd_elf_section_offset (output_bfd, info, input_section,
5006 rel->r_offset);
5007 if (outrel.r_offset == (bfd_vma) -1)
5008 skip = TRUE;
5009 else if (outrel.r_offset == (bfd_vma) -2)
5010 skip = TRUE, relocate = TRUE;
5011
5012 outrel.r_offset += (input_section->output_section->vma
5013 + input_section->output_offset);
5014
5015 if (skip)
5016 memset (&outrel, 0, sizeof outrel);
5017
5018 /* h->dynindx may be -1 if this symbol was marked to
5019 become local. */
5020 else if (h != NULL
5021 && h->dynindx != -1
5022 && (IS_X86_64_PCREL_TYPE (r_type)
5023 || !(bfd_link_executable (info)
5024 || SYMBOLIC_BIND (info, h))
5025 || ! h->def_regular))
5026 {
5027 outrel.r_info = htab->r_info (h->dynindx, r_type);
5028 outrel.r_addend = rel->r_addend;
5029 }
5030 else
5031 {
5032 /* This symbol is local, or marked to become local.
5033 When relocation overflow check is disabled, we
5034 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
5035 if (r_type == htab->pointer_r_type
5036 || (r_type == R_X86_64_32
5037 && info->no_reloc_overflow_check))
5038 {
5039 relocate = TRUE;
5040 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5041 outrel.r_addend = relocation + rel->r_addend;
5042 }
5043 else if (r_type == R_X86_64_64
5044 && !ABI_64_P (output_bfd))
5045 {
5046 relocate = TRUE;
5047 outrel.r_info = htab->r_info (0,
5048 R_X86_64_RELATIVE64);
5049 outrel.r_addend = relocation + rel->r_addend;
5050 /* Check addend overflow. */
5051 if ((outrel.r_addend & 0x80000000)
5052 != (rel->r_addend & 0x80000000))
5053 {
5054 const char *name;
5055 int addend = rel->r_addend;
5056 if (h && h->root.root.string)
5057 name = h->root.root.string;
5058 else
5059 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
5060 sym, NULL);
5061 if (addend < 0)
5062 _bfd_error_handler
5063 /* xgettext:c-format */
5064 (_("%B: addend -0x%x in relocation %s against "
5065 "symbol `%s' at 0x%lx in section `%A' is "
5066 "out of range"),
5067 input_bfd, input_section, addend,
5068 howto->name, name,
5069 (unsigned long) rel->r_offset);
5070 else
5071 _bfd_error_handler
5072 /* xgettext:c-format */
5073 (_("%B: addend 0x%x in relocation %s against "
5074 "symbol `%s' at 0x%lx in section `%A' is "
5075 "out of range"),
5076 input_bfd, input_section, addend,
5077 howto->name, name,
5078 (unsigned long) rel->r_offset);
5079 bfd_set_error (bfd_error_bad_value);
5080 return FALSE;
5081 }
5082 }
5083 else
5084 {
5085 long sindx;
5086
5087 if (bfd_is_abs_section (sec))
5088 sindx = 0;
5089 else if (sec == NULL || sec->owner == NULL)
5090 {
5091 bfd_set_error (bfd_error_bad_value);
5092 return FALSE;
5093 }
5094 else
5095 {
5096 asection *osec;
5097
5098 /* We are turning this relocation into one
5099 against a section symbol. It would be
5100 proper to subtract the symbol's value,
5101 osec->vma, from the emitted reloc addend,
5102 but ld.so expects buggy relocs. */
5103 osec = sec->output_section;
5104 sindx = elf_section_data (osec)->dynindx;
5105 if (sindx == 0)
5106 {
5107 asection *oi = htab->elf.text_index_section;
5108 sindx = elf_section_data (oi)->dynindx;
5109 }
5110 BFD_ASSERT (sindx != 0);
5111 }
5112
5113 outrel.r_info = htab->r_info (sindx, r_type);
5114 outrel.r_addend = relocation + rel->r_addend;
5115 }
5116 }
5117
5118 sreloc = elf_section_data (input_section)->sreloc;
5119
5120 if (sreloc == NULL || sreloc->contents == NULL)
5121 {
5122 r = bfd_reloc_notsupported;
5123 goto check_relocation_error;
5124 }
5125
5126 elf_append_rela (output_bfd, sreloc, &outrel);
5127
5128 /* If this reloc is against an external symbol, we do
5129 not want to fiddle with the addend. Otherwise, we
5130 need to include the symbol value so that it becomes
5131 an addend for the dynamic reloc. */
5132 if (! relocate)
5133 continue;
5134 }
5135
5136 break;
5137
5138 case R_X86_64_TLSGD:
5139 case R_X86_64_GOTPC32_TLSDESC:
5140 case R_X86_64_TLSDESC_CALL:
5141 case R_X86_64_GOTTPOFF:
5142 tls_type = GOT_UNKNOWN;
5143 if (h == NULL && local_got_offsets)
5144 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
5145 else if (h != NULL)
5146 tls_type = elf_x86_64_hash_entry (h)->tls_type;
5147
5148 if (! elf_x86_64_tls_transition (info, input_bfd,
5149 input_section, contents,
5150 symtab_hdr, sym_hashes,
5151 &r_type, tls_type, rel,
5152 relend, h, r_symndx, TRUE))
5153 return FALSE;
5154
5155 if (r_type == R_X86_64_TPOFF32)
5156 {
5157 bfd_vma roff = rel->r_offset;
5158
5159 BFD_ASSERT (! unresolved_reloc);
5160
5161 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
5162 {
5163 /* GD->LE transition. For 64bit, change
5164 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5165 .word 0x6666; rex64; call __tls_get_addr@PLT
5166 or
5167 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5168 .byte 0x66; rex64
5169 call *__tls_get_addr@GOTPCREL(%rip)
5170 which may be converted to
5171 addr32 call __tls_get_addr
5172 into:
5173 movq %fs:0, %rax
5174 leaq foo@tpoff(%rax), %rax
5175 For 32bit, change
5176 leaq foo@tlsgd(%rip), %rdi
5177 .word 0x6666; rex64; call __tls_get_addr@PLT
5178 or
5179 leaq foo@tlsgd(%rip), %rdi
5180 .byte 0x66; rex64
5181 call *__tls_get_addr@GOTPCREL(%rip)
5182 which may be converted to
5183 addr32 call __tls_get_addr
5184 into:
5185 movl %fs:0, %eax
5186 leaq foo@tpoff(%rax), %rax
5187 For largepic, change:
5188 leaq foo@tlsgd(%rip), %rdi
5189 movabsq $__tls_get_addr@pltoff, %rax
5190 addq %r15, %rax
5191 call *%rax
5192 into:
5193 movq %fs:0, %rax
5194 leaq foo@tpoff(%rax), %rax
5195 nopw 0x0(%rax,%rax,1) */
5196 int largepic = 0;
5197 if (ABI_64_P (output_bfd))
5198 {
5199 if (contents[roff + 5] == 0xb8)
5200 {
5201 memcpy (contents + roff - 3,
5202 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
5203 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5204 largepic = 1;
5205 }
5206 else
5207 memcpy (contents + roff - 4,
5208 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
5209 16);
5210 }
5211 else
5212 memcpy (contents + roff - 3,
5213 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
5214 15);
5215 bfd_put_32 (output_bfd,
5216 elf_x86_64_tpoff (info, relocation),
5217 contents + roff + 8 + largepic);
5218 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
5219 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
5220 rel++;
5221 wrel++;
5222 continue;
5223 }
5224 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
5225 {
5226 /* GDesc -> LE transition.
5227 It's originally something like:
5228 leaq x@tlsdesc(%rip), %rax
5229
5230 Change it to:
5231 movl $x@tpoff, %rax. */
5232
5233 unsigned int val, type;
5234
5235 type = bfd_get_8 (input_bfd, contents + roff - 3);
5236 val = bfd_get_8 (input_bfd, contents + roff - 1);
5237 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
5238 contents + roff - 3);
5239 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
5240 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
5241 contents + roff - 1);
5242 bfd_put_32 (output_bfd,
5243 elf_x86_64_tpoff (info, relocation),
5244 contents + roff);
5245 continue;
5246 }
5247 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
5248 {
5249 /* GDesc -> LE transition.
5250 It's originally:
5251 call *(%rax)
5252 Turn it into:
5253 xchg %ax,%ax. */
5254 bfd_put_8 (output_bfd, 0x66, contents + roff);
5255 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5256 continue;
5257 }
5258 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
5259 {
5260 /* IE->LE transition:
5261 For 64bit, originally it can be one of:
5262 movq foo@gottpoff(%rip), %reg
5263 addq foo@gottpoff(%rip), %reg
5264 We change it into:
5265 movq $foo, %reg
5266 leaq foo(%reg), %reg
5267 addq $foo, %reg.
5268 For 32bit, originally it can be one of:
5269 movq foo@gottpoff(%rip), %reg
5270 addl foo@gottpoff(%rip), %reg
5271 We change it into:
5272 movq $foo, %reg
5273 leal foo(%reg), %reg
5274 addl $foo, %reg. */
5275
5276 unsigned int val, type, reg;
5277
5278 if (roff >= 3)
5279 val = bfd_get_8 (input_bfd, contents + roff - 3);
5280 else
5281 val = 0;
5282 type = bfd_get_8 (input_bfd, contents + roff - 2);
5283 reg = bfd_get_8 (input_bfd, contents + roff - 1);
5284 reg >>= 3;
5285 if (type == 0x8b)
5286 {
5287 /* movq */
5288 if (val == 0x4c)
5289 bfd_put_8 (output_bfd, 0x49,
5290 contents + roff - 3);
5291 else if (!ABI_64_P (output_bfd) && val == 0x44)
5292 bfd_put_8 (output_bfd, 0x41,
5293 contents + roff - 3);
5294 bfd_put_8 (output_bfd, 0xc7,
5295 contents + roff - 2);
5296 bfd_put_8 (output_bfd, 0xc0 | reg,
5297 contents + roff - 1);
5298 }
5299 else if (reg == 4)
5300 {
5301 /* addq/addl -> addq/addl - addressing with %rsp/%r12
5302 is special */
5303 if (val == 0x4c)
5304 bfd_put_8 (output_bfd, 0x49,
5305 contents + roff - 3);
5306 else if (!ABI_64_P (output_bfd) && val == 0x44)
5307 bfd_put_8 (output_bfd, 0x41,
5308 contents + roff - 3);
5309 bfd_put_8 (output_bfd, 0x81,
5310 contents + roff - 2);
5311 bfd_put_8 (output_bfd, 0xc0 | reg,
5312 contents + roff - 1);
5313 }
5314 else
5315 {
5316 /* addq/addl -> leaq/leal */
5317 if (val == 0x4c)
5318 bfd_put_8 (output_bfd, 0x4d,
5319 contents + roff - 3);
5320 else if (!ABI_64_P (output_bfd) && val == 0x44)
5321 bfd_put_8 (output_bfd, 0x45,
5322 contents + roff - 3);
5323 bfd_put_8 (output_bfd, 0x8d,
5324 contents + roff - 2);
5325 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
5326 contents + roff - 1);
5327 }
5328 bfd_put_32 (output_bfd,
5329 elf_x86_64_tpoff (info, relocation),
5330 contents + roff);
5331 continue;
5332 }
5333 else
5334 BFD_ASSERT (FALSE);
5335 }
5336
5337 if (htab->elf.sgot == NULL)
5338 abort ();
5339
5340 if (h != NULL)
5341 {
5342 off = h->got.offset;
5343 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
5344 }
5345 else
5346 {
5347 if (local_got_offsets == NULL)
5348 abort ();
5349
5350 off = local_got_offsets[r_symndx];
5351 offplt = local_tlsdesc_gotents[r_symndx];
5352 }
5353
5354 if ((off & 1) != 0)
5355 off &= ~1;
5356 else
5357 {
5358 Elf_Internal_Rela outrel;
5359 int dr_type, indx;
5360 asection *sreloc;
5361
5362 if (htab->elf.srelgot == NULL)
5363 abort ();
5364
5365 indx = h && h->dynindx != -1 ? h->dynindx : 0;
5366
5367 if (GOT_TLS_GDESC_P (tls_type))
5368 {
5369 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
5370 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
5371 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
5372 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
5373 + htab->elf.sgotplt->output_offset
5374 + offplt
5375 + htab->sgotplt_jump_table_size);
5376 sreloc = htab->elf.srelplt;
5377 if (indx == 0)
5378 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
5379 else
5380 outrel.r_addend = 0;
5381 elf_append_rela (output_bfd, sreloc, &outrel);
5382 }
5383
5384 sreloc = htab->elf.srelgot;
5385
5386 outrel.r_offset = (htab->elf.sgot->output_section->vma
5387 + htab->elf.sgot->output_offset + off);
5388
5389 if (GOT_TLS_GD_P (tls_type))
5390 dr_type = R_X86_64_DTPMOD64;
5391 else if (GOT_TLS_GDESC_P (tls_type))
5392 goto dr_done;
5393 else
5394 dr_type = R_X86_64_TPOFF64;
5395
5396 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
5397 outrel.r_addend = 0;
5398 if ((dr_type == R_X86_64_TPOFF64
5399 || dr_type == R_X86_64_TLSDESC) && indx == 0)
5400 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
5401 outrel.r_info = htab->r_info (indx, dr_type);
5402
5403 elf_append_rela (output_bfd, sreloc, &outrel);
5404
5405 if (GOT_TLS_GD_P (tls_type))
5406 {
5407 if (indx == 0)
5408 {
5409 BFD_ASSERT (! unresolved_reloc);
5410 bfd_put_64 (output_bfd,
5411 relocation - elf_x86_64_dtpoff_base (info),
5412 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5413 }
5414 else
5415 {
5416 bfd_put_64 (output_bfd, 0,
5417 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5418 outrel.r_info = htab->r_info (indx,
5419 R_X86_64_DTPOFF64);
5420 outrel.r_offset += GOT_ENTRY_SIZE;
5421 elf_append_rela (output_bfd, sreloc,
5422 &outrel);
5423 }
5424 }
5425
5426 dr_done:
5427 if (h != NULL)
5428 h->got.offset |= 1;
5429 else
5430 local_got_offsets[r_symndx] |= 1;
5431 }
5432
5433 if (off >= (bfd_vma) -2
5434 && ! GOT_TLS_GDESC_P (tls_type))
5435 abort ();
5436 if (r_type == ELF32_R_TYPE (rel->r_info))
5437 {
5438 if (r_type == R_X86_64_GOTPC32_TLSDESC
5439 || r_type == R_X86_64_TLSDESC_CALL)
5440 relocation = htab->elf.sgotplt->output_section->vma
5441 + htab->elf.sgotplt->output_offset
5442 + offplt + htab->sgotplt_jump_table_size;
5443 else
5444 relocation = htab->elf.sgot->output_section->vma
5445 + htab->elf.sgot->output_offset + off;
5446 unresolved_reloc = FALSE;
5447 }
5448 else
5449 {
5450 bfd_vma roff = rel->r_offset;
5451
5452 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
5453 {
5454 /* GD->IE transition. For 64bit, change
5455 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5456 .word 0x6666; rex64; call __tls_get_addr@PLT
5457 or
5458 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5459 .byte 0x66; rex64
5460 call *__tls_get_addr@GOTPCREL(%rip
5461 which may be converted to
5462 addr32 call __tls_get_addr
5463 into:
5464 movq %fs:0, %rax
5465 addq foo@gottpoff(%rip), %rax
5466 For 32bit, change
5467 leaq foo@tlsgd(%rip), %rdi
5468 .word 0x6666; rex64; call __tls_get_addr@PLT
5469 or
5470 leaq foo@tlsgd(%rip), %rdi
5471 .byte 0x66; rex64;
5472 call *__tls_get_addr@GOTPCREL(%rip)
5473 which may be converted to
5474 addr32 call __tls_get_addr
5475 into:
5476 movl %fs:0, %eax
5477 addq foo@gottpoff(%rip), %rax
5478 For largepic, change:
5479 leaq foo@tlsgd(%rip), %rdi
5480 movabsq $__tls_get_addr@pltoff, %rax
5481 addq %r15, %rax
5482 call *%rax
5483 into:
5484 movq %fs:0, %rax
5485 addq foo@gottpoff(%rax), %rax
5486 nopw 0x0(%rax,%rax,1) */
5487 int largepic = 0;
5488 if (ABI_64_P (output_bfd))
5489 {
5490 if (contents[roff + 5] == 0xb8)
5491 {
5492 memcpy (contents + roff - 3,
5493 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5494 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5495 largepic = 1;
5496 }
5497 else
5498 memcpy (contents + roff - 4,
5499 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5500 16);
5501 }
5502 else
5503 memcpy (contents + roff - 3,
5504 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5505 15);
5506
5507 relocation = (htab->elf.sgot->output_section->vma
5508 + htab->elf.sgot->output_offset + off
5509 - roff
5510 - largepic
5511 - input_section->output_section->vma
5512 - input_section->output_offset
5513 - 12);
5514 bfd_put_32 (output_bfd, relocation,
5515 contents + roff + 8 + largepic);
5516 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5517 rel++;
5518 wrel++;
5519 continue;
5520 }
5521 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
5522 {
5523 /* GDesc -> IE transition.
5524 It's originally something like:
5525 leaq x@tlsdesc(%rip), %rax
5526
5527 Change it to:
5528 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5529
5530 /* Now modify the instruction as appropriate. To
5531 turn a leaq into a movq in the form we use it, it
5532 suffices to change the second byte from 0x8d to
5533 0x8b. */
5534 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
5535
5536 bfd_put_32 (output_bfd,
5537 htab->elf.sgot->output_section->vma
5538 + htab->elf.sgot->output_offset + off
5539 - rel->r_offset
5540 - input_section->output_section->vma
5541 - input_section->output_offset
5542 - 4,
5543 contents + roff);
5544 continue;
5545 }
5546 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
5547 {
5548 /* GDesc -> IE transition.
5549 It's originally:
5550 call *(%rax)
5551
5552 Change it to:
5553 xchg %ax, %ax. */
5554
5555 bfd_put_8 (output_bfd, 0x66, contents + roff);
5556 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5557 continue;
5558 }
5559 else
5560 BFD_ASSERT (FALSE);
5561 }
5562 break;
5563
5564 case R_X86_64_TLSLD:
5565 if (! elf_x86_64_tls_transition (info, input_bfd,
5566 input_section, contents,
5567 symtab_hdr, sym_hashes,
5568 &r_type, GOT_UNKNOWN, rel,
5569 relend, h, r_symndx, TRUE))
5570 return FALSE;
5571
5572 if (r_type != R_X86_64_TLSLD)
5573 {
5574 /* LD->LE transition:
5575 leaq foo@tlsld(%rip), %rdi
5576 call __tls_get_addr@PLT
5577 For 64bit, we change it into:
5578 .word 0x6666; .byte 0x66; movq %fs:0, %rax
5579 For 32bit, we change it into:
5580 nopl 0x0(%rax); movl %fs:0, %eax
5581 Or
5582 leaq foo@tlsld(%rip), %rdi;
5583 call *__tls_get_addr@GOTPCREL(%rip)
5584 which may be converted to
5585 addr32 call __tls_get_addr
5586 For 64bit, we change it into:
5587 .word 0x6666; .word 0x6666; movq %fs:0, %rax
5588 For 32bit, we change it into:
5589 nopw 0x0(%rax); movl %fs:0, %eax
5590 For largepic, change:
5591 leaq foo@tlsgd(%rip), %rdi
5592 movabsq $__tls_get_addr@pltoff, %rax
5593 addq %rbx, %rax
5594 call *%rax
5595 into
5596 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
5597 movq %fs:0, %eax */
5598
5599 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
5600 if (ABI_64_P (output_bfd))
5601 {
5602 if (contents[rel->r_offset + 5] == 0xb8)
5603 memcpy (contents + rel->r_offset - 3,
5604 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5605 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5606 else if (contents[rel->r_offset + 4] == 0xff
5607 || contents[rel->r_offset + 4] == 0x67)
5608 memcpy (contents + rel->r_offset - 3,
5609 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
5610 13);
5611 else
5612 memcpy (contents + rel->r_offset - 3,
5613 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5614 }
5615 else
5616 {
5617 if (contents[rel->r_offset + 4] == 0xff)
5618 memcpy (contents + rel->r_offset - 3,
5619 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
5620 13);
5621 else
5622 memcpy (contents + rel->r_offset - 3,
5623 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5624 }
5625 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
5626 and R_X86_64_PLTOFF64. */
5627 rel++;
5628 wrel++;
5629 continue;
5630 }
5631
5632 if (htab->elf.sgot == NULL)
5633 abort ();
5634
5635 off = htab->tls_ld_got.offset;
5636 if (off & 1)
5637 off &= ~1;
5638 else
5639 {
5640 Elf_Internal_Rela outrel;
5641
5642 if (htab->elf.srelgot == NULL)
5643 abort ();
5644
5645 outrel.r_offset = (htab->elf.sgot->output_section->vma
5646 + htab->elf.sgot->output_offset + off);
5647
5648 bfd_put_64 (output_bfd, 0,
5649 htab->elf.sgot->contents + off);
5650 bfd_put_64 (output_bfd, 0,
5651 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5652 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
5653 outrel.r_addend = 0;
5654 elf_append_rela (output_bfd, htab->elf.srelgot,
5655 &outrel);
5656 htab->tls_ld_got.offset |= 1;
5657 }
5658 relocation = htab->elf.sgot->output_section->vma
5659 + htab->elf.sgot->output_offset + off;
5660 unresolved_reloc = FALSE;
5661 break;
5662
5663 case R_X86_64_DTPOFF32:
5664 if (!bfd_link_executable (info)
5665 || (input_section->flags & SEC_CODE) == 0)
5666 relocation -= elf_x86_64_dtpoff_base (info);
5667 else
5668 relocation = elf_x86_64_tpoff (info, relocation);
5669 break;
5670
5671 case R_X86_64_TPOFF32:
5672 case R_X86_64_TPOFF64:
5673 BFD_ASSERT (bfd_link_executable (info));
5674 relocation = elf_x86_64_tpoff (info, relocation);
5675 break;
5676
5677 case R_X86_64_DTPOFF64:
5678 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
5679 relocation -= elf_x86_64_dtpoff_base (info);
5680 break;
5681
5682 default:
5683 break;
5684 }
5685
5686 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5687 because such sections are not SEC_ALLOC and thus ld.so will
5688 not process them. */
5689 if (unresolved_reloc
5690 && !((input_section->flags & SEC_DEBUGGING) != 0
5691 && h->def_dynamic)
5692 && _bfd_elf_section_offset (output_bfd, info, input_section,
5693 rel->r_offset) != (bfd_vma) -1)
5694 {
5695 _bfd_error_handler
5696 /* xgettext:c-format */
5697 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5698 input_bfd,
5699 input_section,
5700 (long) rel->r_offset,
5701 howto->name,
5702 h->root.root.string);
5703 return FALSE;
5704 }
5705
5706 do_relocation:
5707 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5708 contents, rel->r_offset,
5709 relocation, rel->r_addend);
5710
5711 check_relocation_error:
5712 if (r != bfd_reloc_ok)
5713 {
5714 const char *name;
5715
5716 if (h != NULL)
5717 name = h->root.root.string;
5718 else
5719 {
5720 name = bfd_elf_string_from_elf_section (input_bfd,
5721 symtab_hdr->sh_link,
5722 sym->st_name);
5723 if (name == NULL)
5724 return FALSE;
5725 if (*name == '\0')
5726 name = bfd_section_name (input_bfd, sec);
5727 }
5728
5729 if (r == bfd_reloc_overflow)
5730 (*info->callbacks->reloc_overflow)
5731 (info, (h ? &h->root : NULL), name, howto->name,
5732 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
5733 else
5734 {
5735 _bfd_error_handler
5736 /* xgettext:c-format */
5737 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5738 input_bfd, input_section,
5739 (long) rel->r_offset, name, (int) r);
5740 return FALSE;
5741 }
5742 }
5743
5744 if (wrel != rel)
5745 *wrel = *rel;
5746 }
5747
5748 if (wrel != rel)
5749 {
5750 Elf_Internal_Shdr *rel_hdr;
5751 size_t deleted = rel - wrel;
5752
5753 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5754 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5755 if (rel_hdr->sh_size == 0)
5756 {
5757 /* It is too late to remove an empty reloc section. Leave
5758 one NONE reloc.
5759 ??? What is wrong with an empty section??? */
5760 rel_hdr->sh_size = rel_hdr->sh_entsize;
5761 deleted -= 1;
5762 }
5763 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5764 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5765 input_section->reloc_count -= deleted;
5766 }
5767
5768 return TRUE;
5769 }
5770
5771 /* Finish up dynamic symbol handling. We set the contents of various
5772 dynamic sections here. */
5773
5774 static bfd_boolean
5775 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
5776 struct bfd_link_info *info,
5777 struct elf_link_hash_entry *h,
5778 Elf_Internal_Sym *sym)
5779 {
5780 struct elf_x86_64_link_hash_table *htab;
5781 const struct elf_x86_64_backend_data *abed;
5782 bfd_boolean use_plt_bnd;
5783 struct elf_x86_64_link_hash_entry *eh;
5784 bfd_boolean local_undefweak;
5785
5786 htab = elf_x86_64_hash_table (info);
5787 if (htab == NULL)
5788 return FALSE;
5789
5790 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5791 section only if there is .plt section. */
5792 use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL;
5793 abed = (use_plt_bnd
5794 ? &elf_x86_64_bnd_arch_bed
5795 : get_elf_x86_64_backend_data (output_bfd));
5796
5797 eh = (struct elf_x86_64_link_hash_entry *) h;
5798
5799 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5800 resolved undefined weak symbols in executable so that their
5801 references have value 0 at run-time. */
5802 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5803 eh->has_got_reloc,
5804 eh);
5805
5806 if (h->plt.offset != (bfd_vma) -1)
5807 {
5808 bfd_vma plt_index;
5809 bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset;
5810 bfd_vma plt_plt_insn_end, plt_got_insn_size;
5811 Elf_Internal_Rela rela;
5812 bfd_byte *loc;
5813 asection *plt, *gotplt, *relplt, *resolved_plt;
5814 const struct elf_backend_data *bed;
5815 bfd_vma plt_got_pcrel_offset;
5816
5817 /* When building a static executable, use .iplt, .igot.plt and
5818 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5819 if (htab->elf.splt != NULL)
5820 {
5821 plt = htab->elf.splt;
5822 gotplt = htab->elf.sgotplt;
5823 relplt = htab->elf.srelplt;
5824 }
5825 else
5826 {
5827 plt = htab->elf.iplt;
5828 gotplt = htab->elf.igotplt;
5829 relplt = htab->elf.irelplt;
5830 }
5831
5832 /* This symbol has an entry in the procedure linkage table. Set
5833 it up. */
5834 if ((h->dynindx == -1
5835 && !local_undefweak
5836 && !((h->forced_local || bfd_link_executable (info))
5837 && h->def_regular
5838 && h->type == STT_GNU_IFUNC))
5839 || plt == NULL
5840 || gotplt == NULL
5841 || relplt == NULL)
5842 abort ();
5843
5844 /* Get the index in the procedure linkage table which
5845 corresponds to this symbol. This is the index of this symbol
5846 in all the symbols for which we are making plt entries. The
5847 first entry in the procedure linkage table is reserved.
5848
5849 Get the offset into the .got table of the entry that
5850 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5851 bytes. The first three are reserved for the dynamic linker.
5852
5853 For static executables, we don't reserve anything. */
5854
5855 if (plt == htab->elf.splt)
5856 {
5857 got_offset = h->plt.offset / abed->plt_entry_size - 1;
5858 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
5859 }
5860 else
5861 {
5862 got_offset = h->plt.offset / abed->plt_entry_size;
5863 got_offset = got_offset * GOT_ENTRY_SIZE;
5864 }
5865
5866 plt_plt_insn_end = abed->plt_plt_insn_end;
5867 plt_plt_offset = abed->plt_plt_offset;
5868 plt_got_insn_size = abed->plt_got_insn_size;
5869 plt_got_offset = abed->plt_got_offset;
5870 if (use_plt_bnd)
5871 {
5872 /* Use the second PLT with BND relocations. */
5873 const bfd_byte *plt_entry, *plt2_entry;
5874
5875 if (eh->has_bnd_reloc)
5876 {
5877 plt_entry = elf_x86_64_bnd_plt_entry;
5878 plt2_entry = elf_x86_64_bnd_plt2_entry;
5879 }
5880 else
5881 {
5882 plt_entry = elf_x86_64_legacy_plt_entry;
5883 plt2_entry = elf_x86_64_legacy_plt2_entry;
5884
5885 /* Subtract 1 since there is no BND prefix. */
5886 plt_plt_insn_end -= 1;
5887 plt_plt_offset -= 1;
5888 plt_got_insn_size -= 1;
5889 plt_got_offset -= 1;
5890 }
5891
5892 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry)
5893 == sizeof (elf_x86_64_legacy_plt_entry));
5894
5895 /* Fill in the entry in the procedure linkage table. */
5896 memcpy (plt->contents + h->plt.offset,
5897 plt_entry, sizeof (elf_x86_64_legacy_plt_entry));
5898 /* Fill in the entry in the second PLT. */
5899 memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset,
5900 plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5901
5902 resolved_plt = htab->plt_bnd;
5903 plt_offset = eh->plt_bnd.offset;
5904 }
5905 else
5906 {
5907 /* Fill in the entry in the procedure linkage table. */
5908 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
5909 abed->plt_entry_size);
5910
5911 resolved_plt = plt;
5912 plt_offset = h->plt.offset;
5913 }
5914
5915 /* Insert the relocation positions of the plt section. */
5916
5917 /* Put offset the PC-relative instruction referring to the GOT entry,
5918 subtracting the size of that instruction. */
5919 plt_got_pcrel_offset = (gotplt->output_section->vma
5920 + gotplt->output_offset
5921 + got_offset
5922 - resolved_plt->output_section->vma
5923 - resolved_plt->output_offset
5924 - plt_offset
5925 - plt_got_insn_size);
5926
5927 /* Check PC-relative offset overflow in PLT entry. */
5928 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5929 /* xgettext:c-format */
5930 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5931 output_bfd, h->root.root.string);
5932
5933 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5934 resolved_plt->contents + plt_offset + plt_got_offset);
5935
5936 /* Fill in the entry in the global offset table, initially this
5937 points to the second part of the PLT entry. Leave the entry
5938 as zero for undefined weak symbol in PIE. No PLT relocation
5939 against undefined weak symbol in PIE. */
5940 if (!local_undefweak)
5941 {
5942 bfd_put_64 (output_bfd, (plt->output_section->vma
5943 + plt->output_offset
5944 + h->plt.offset
5945 + abed->plt_lazy_offset),
5946 gotplt->contents + got_offset);
5947
5948 /* Fill in the entry in the .rela.plt section. */
5949 rela.r_offset = (gotplt->output_section->vma
5950 + gotplt->output_offset
5951 + got_offset);
5952 if (h->dynindx == -1
5953 || ((bfd_link_executable (info)
5954 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5955 && h->def_regular
5956 && h->type == STT_GNU_IFUNC))
5957 {
5958 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5959 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5960 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5961 rela.r_addend = (h->root.u.def.value
5962 + h->root.u.def.section->output_section->vma
5963 + h->root.u.def.section->output_offset);
5964 /* R_X86_64_IRELATIVE comes last. */
5965 plt_index = htab->next_irelative_index--;
5966 }
5967 else
5968 {
5969 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5970 rela.r_addend = 0;
5971 plt_index = htab->next_jump_slot_index++;
5972 }
5973
5974 /* Don't fill PLT entry for static executables. */
5975 if (plt == htab->elf.splt)
5976 {
5977 bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
5978
5979 /* Put relocation index. */
5980 bfd_put_32 (output_bfd, plt_index,
5981 (plt->contents + h->plt.offset
5982 + abed->plt_reloc_offset));
5983
5984 /* Put offset for jmp .PLT0 and check for overflow. We don't
5985 check relocation index for overflow since branch displacement
5986 will overflow first. */
5987 if (plt0_offset > 0x80000000)
5988 /* xgettext:c-format */
5989 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5990 output_bfd, h->root.root.string);
5991 bfd_put_32 (output_bfd, - plt0_offset,
5992 plt->contents + h->plt.offset + plt_plt_offset);
5993 }
5994
5995 bed = get_elf_backend_data (output_bfd);
5996 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5997 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5998 }
5999 }
6000 else if (eh->plt_got.offset != (bfd_vma) -1)
6001 {
6002 bfd_vma got_offset, plt_offset, plt_got_offset, plt_got_insn_size;
6003 asection *plt, *got;
6004 bfd_boolean got_after_plt;
6005 int32_t got_pcrel_offset;
6006 const bfd_byte *got_plt_entry;
6007
6008 /* Set the entry in the GOT procedure linkage table. */
6009 plt = htab->plt_got;
6010 got = htab->elf.sgot;
6011 got_offset = h->got.offset;
6012
6013 if (got_offset == (bfd_vma) -1
6014 || h->type == STT_GNU_IFUNC
6015 || plt == NULL
6016 || got == NULL)
6017 abort ();
6018
6019 /* Use the second PLT entry template for the GOT PLT since they
6020 are the identical. */
6021 plt_got_insn_size = elf_x86_64_bnd_arch_bed.plt_got_insn_size;
6022 plt_got_offset = elf_x86_64_bnd_arch_bed.plt_got_offset;
6023 if (eh->has_bnd_reloc)
6024 got_plt_entry = elf_x86_64_bnd_plt2_entry;
6025 else
6026 {
6027 got_plt_entry = elf_x86_64_legacy_plt2_entry;
6028
6029 /* Subtract 1 since there is no BND prefix. */
6030 plt_got_insn_size -= 1;
6031 plt_got_offset -= 1;
6032 }
6033
6034 /* Fill in the entry in the GOT procedure linkage table. */
6035 plt_offset = eh->plt_got.offset;
6036 memcpy (plt->contents + plt_offset,
6037 got_plt_entry, sizeof (elf_x86_64_legacy_plt2_entry));
6038
6039 /* Put offset the PC-relative instruction referring to the GOT
6040 entry, subtracting the size of that instruction. */
6041 got_pcrel_offset = (got->output_section->vma
6042 + got->output_offset
6043 + got_offset
6044 - plt->output_section->vma
6045 - plt->output_offset
6046 - plt_offset
6047 - plt_got_insn_size);
6048
6049 /* Check PC-relative offset overflow in GOT PLT entry. */
6050 got_after_plt = got->output_section->vma > plt->output_section->vma;
6051 if ((got_after_plt && got_pcrel_offset < 0)
6052 || (!got_after_plt && got_pcrel_offset > 0))
6053 /* xgettext:c-format */
6054 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
6055 output_bfd, h->root.root.string);
6056
6057 bfd_put_32 (output_bfd, got_pcrel_offset,
6058 plt->contents + plt_offset + plt_got_offset);
6059 }
6060
6061 if (!local_undefweak
6062 && !h->def_regular
6063 && (h->plt.offset != (bfd_vma) -1
6064 || eh->plt_got.offset != (bfd_vma) -1))
6065 {
6066 /* Mark the symbol as undefined, rather than as defined in
6067 the .plt section. Leave the value if there were any
6068 relocations where pointer equality matters (this is a clue
6069 for the dynamic linker, to make function pointer
6070 comparisons work between an application and shared
6071 library), otherwise set it to zero. If a function is only
6072 called from a binary, there is no need to slow down
6073 shared libraries because of that. */
6074 sym->st_shndx = SHN_UNDEF;
6075 if (!h->pointer_equality_needed)
6076 sym->st_value = 0;
6077 }
6078
6079 /* Don't generate dynamic GOT relocation against undefined weak
6080 symbol in executable. */
6081 if (h->got.offset != (bfd_vma) -1
6082 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
6083 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE
6084 && !local_undefweak)
6085 {
6086 Elf_Internal_Rela rela;
6087 asection *relgot = htab->elf.srelgot;
6088
6089 /* This symbol has an entry in the global offset table. Set it
6090 up. */
6091 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
6092 abort ();
6093
6094 rela.r_offset = (htab->elf.sgot->output_section->vma
6095 + htab->elf.sgot->output_offset
6096 + (h->got.offset &~ (bfd_vma) 1));
6097
6098 /* If this is a static link, or it is a -Bsymbolic link and the
6099 symbol is defined locally or was forced to be local because
6100 of a version file, we just want to emit a RELATIVE reloc.
6101 The entry in the global offset table will already have been
6102 initialized in the relocate_section function. */
6103 if (h->def_regular
6104 && h->type == STT_GNU_IFUNC)
6105 {
6106 if (h->plt.offset == (bfd_vma) -1)
6107 {
6108 /* STT_GNU_IFUNC is referenced without PLT. */
6109 if (htab->elf.splt == NULL)
6110 {
6111 /* use .rel[a].iplt section to store .got relocations
6112 in static executable. */
6113 relgot = htab->elf.irelplt;
6114 }
6115 if (SYMBOL_REFERENCES_LOCAL (info, h))
6116 {
6117 rela.r_info = htab->r_info (0,
6118 R_X86_64_IRELATIVE);
6119 rela.r_addend = (h->root.u.def.value
6120 + h->root.u.def.section->output_section->vma
6121 + h->root.u.def.section->output_offset);
6122 }
6123 else
6124 goto do_glob_dat;
6125 }
6126 else if (bfd_link_pic (info))
6127 {
6128 /* Generate R_X86_64_GLOB_DAT. */
6129 goto do_glob_dat;
6130 }
6131 else
6132 {
6133 asection *plt;
6134
6135 if (!h->pointer_equality_needed)
6136 abort ();
6137
6138 /* For non-shared object, we can't use .got.plt, which
6139 contains the real function addres if we need pointer
6140 equality. We load the GOT entry with the PLT entry. */
6141 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
6142 bfd_put_64 (output_bfd, (plt->output_section->vma
6143 + plt->output_offset
6144 + h->plt.offset),
6145 htab->elf.sgot->contents + h->got.offset);
6146 return TRUE;
6147 }
6148 }
6149 else if (bfd_link_pic (info)
6150 && SYMBOL_REFERENCES_LOCAL (info, h))
6151 {
6152 if (!h->def_regular)
6153 return FALSE;
6154 BFD_ASSERT((h->got.offset & 1) != 0);
6155 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
6156 rela.r_addend = (h->root.u.def.value
6157 + h->root.u.def.section->output_section->vma
6158 + h->root.u.def.section->output_offset);
6159 }
6160 else
6161 {
6162 BFD_ASSERT((h->got.offset & 1) == 0);
6163 do_glob_dat:
6164 bfd_put_64 (output_bfd, (bfd_vma) 0,
6165 htab->elf.sgot->contents + h->got.offset);
6166 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
6167 rela.r_addend = 0;
6168 }
6169
6170 elf_append_rela (output_bfd, relgot, &rela);
6171 }
6172
6173 if (h->needs_copy)
6174 {
6175 Elf_Internal_Rela rela;
6176 asection *s;
6177
6178 /* This symbol needs a copy reloc. Set it up. */
6179
6180 if (h->dynindx == -1
6181 || (h->root.type != bfd_link_hash_defined
6182 && h->root.type != bfd_link_hash_defweak)
6183 || htab->elf.srelbss == NULL
6184 || htab->elf.sreldynrelro == NULL)
6185 abort ();
6186
6187 rela.r_offset = (h->root.u.def.value
6188 + h->root.u.def.section->output_section->vma
6189 + h->root.u.def.section->output_offset);
6190 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
6191 rela.r_addend = 0;
6192 if (h->root.u.def.section == htab->elf.sdynrelro)
6193 s = htab->elf.sreldynrelro;
6194 else
6195 s = htab->elf.srelbss;
6196 elf_append_rela (output_bfd, s, &rela);
6197 }
6198
6199 return TRUE;
6200 }
6201
6202 /* Finish up local dynamic symbol handling. We set the contents of
6203 various dynamic sections here. */
6204
6205 static bfd_boolean
6206 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
6207 {
6208 struct elf_link_hash_entry *h
6209 = (struct elf_link_hash_entry *) *slot;
6210 struct bfd_link_info *info
6211 = (struct bfd_link_info *) inf;
6212
6213 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
6214 info, h, NULL);
6215 }
6216
6217 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
6218 here since undefined weak symbol may not be dynamic and may not be
6219 called for elf_x86_64_finish_dynamic_symbol. */
6220
6221 static bfd_boolean
6222 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
6223 void *inf)
6224 {
6225 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
6226 struct bfd_link_info *info = (struct bfd_link_info *) inf;
6227
6228 if (h->root.type != bfd_link_hash_undefweak
6229 || h->dynindx != -1)
6230 return TRUE;
6231
6232 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
6233 info, h, NULL);
6234 }
6235
6236 /* Used to decide how to sort relocs in an optimal manner for the
6237 dynamic linker, before writing them out. */
6238
6239 static enum elf_reloc_type_class
6240 elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
6241 const asection *rel_sec ATTRIBUTE_UNUSED,
6242 const Elf_Internal_Rela *rela)
6243 {
6244 bfd *abfd = info->output_bfd;
6245 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
6246 struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
6247
6248 if (htab->elf.dynsym != NULL
6249 && htab->elf.dynsym->contents != NULL)
6250 {
6251 /* Check relocation against STT_GNU_IFUNC symbol if there are
6252 dynamic symbols. */
6253 unsigned long r_symndx = htab->r_sym (rela->r_info);
6254 if (r_symndx != STN_UNDEF)
6255 {
6256 Elf_Internal_Sym sym;
6257 if (!bed->s->swap_symbol_in (abfd,
6258 (htab->elf.dynsym->contents
6259 + r_symndx * bed->s->sizeof_sym),
6260 0, &sym))
6261 abort ();
6262
6263 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
6264 return reloc_class_ifunc;
6265 }
6266 }
6267
6268 switch ((int) ELF32_R_TYPE (rela->r_info))
6269 {
6270 case R_X86_64_IRELATIVE:
6271 return reloc_class_ifunc;
6272 case R_X86_64_RELATIVE:
6273 case R_X86_64_RELATIVE64:
6274 return reloc_class_relative;
6275 case R_X86_64_JUMP_SLOT:
6276 return reloc_class_plt;
6277 case R_X86_64_COPY:
6278 return reloc_class_copy;
6279 default:
6280 return reloc_class_normal;
6281 }
6282 }
6283
6284 /* Finish up the dynamic sections. */
6285
6286 static bfd_boolean
6287 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
6288 struct bfd_link_info *info)
6289 {
6290 struct elf_x86_64_link_hash_table *htab;
6291 bfd *dynobj;
6292 asection *sdyn;
6293 const struct elf_x86_64_backend_data *abed;
6294
6295 htab = elf_x86_64_hash_table (info);
6296 if (htab == NULL)
6297 return FALSE;
6298
6299 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
6300 section only if there is .plt section. */
6301 abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL
6302 ? &elf_x86_64_bnd_arch_bed
6303 : get_elf_x86_64_backend_data (output_bfd));
6304
6305 dynobj = htab->elf.dynobj;
6306 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
6307
6308 if (htab->elf.dynamic_sections_created)
6309 {
6310 bfd_byte *dyncon, *dynconend;
6311 const struct elf_backend_data *bed;
6312 bfd_size_type sizeof_dyn;
6313
6314 if (sdyn == NULL || htab->elf.sgot == NULL)
6315 abort ();
6316
6317 bed = get_elf_backend_data (dynobj);
6318 sizeof_dyn = bed->s->sizeof_dyn;
6319 dyncon = sdyn->contents;
6320 dynconend = sdyn->contents + sdyn->size;
6321 for (; dyncon < dynconend; dyncon += sizeof_dyn)
6322 {
6323 Elf_Internal_Dyn dyn;
6324 asection *s;
6325
6326 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
6327
6328 switch (dyn.d_tag)
6329 {
6330 default:
6331 continue;
6332
6333 case DT_PLTGOT:
6334 s = htab->elf.sgotplt;
6335 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
6336 break;
6337
6338 case DT_JMPREL:
6339 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
6340 break;
6341
6342 case DT_PLTRELSZ:
6343 s = htab->elf.srelplt->output_section;
6344 dyn.d_un.d_val = s->size;
6345 break;
6346
6347 case DT_TLSDESC_PLT:
6348 s = htab->elf.splt;
6349 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
6350 + htab->tlsdesc_plt;
6351 break;
6352
6353 case DT_TLSDESC_GOT:
6354 s = htab->elf.sgot;
6355 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
6356 + htab->tlsdesc_got;
6357 break;
6358 }
6359
6360 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
6361 }
6362
6363 /* Fill in the special first entry in the procedure linkage table. */
6364 if (htab->elf.splt && htab->elf.splt->size > 0)
6365 {
6366 /* Fill in the first entry in the procedure linkage table. */
6367 memcpy (htab->elf.splt->contents,
6368 abed->plt0_entry, abed->plt_entry_size);
6369 /* Add offset for pushq GOT+8(%rip), since the instruction
6370 uses 6 bytes subtract this value. */
6371 bfd_put_32 (output_bfd,
6372 (htab->elf.sgotplt->output_section->vma
6373 + htab->elf.sgotplt->output_offset
6374 + 8
6375 - htab->elf.splt->output_section->vma
6376 - htab->elf.splt->output_offset
6377 - 6),
6378 htab->elf.splt->contents + abed->plt0_got1_offset);
6379 /* Add offset for the PC-relative instruction accessing GOT+16,
6380 subtracting the offset to the end of that instruction. */
6381 bfd_put_32 (output_bfd,
6382 (htab->elf.sgotplt->output_section->vma
6383 + htab->elf.sgotplt->output_offset
6384 + 16
6385 - htab->elf.splt->output_section->vma
6386 - htab->elf.splt->output_offset
6387 - abed->plt0_got2_insn_end),
6388 htab->elf.splt->contents + abed->plt0_got2_offset);
6389
6390 elf_section_data (htab->elf.splt->output_section)
6391 ->this_hdr.sh_entsize = abed->plt_entry_size;
6392
6393 if (htab->tlsdesc_plt)
6394 {
6395 bfd_put_64 (output_bfd, (bfd_vma) 0,
6396 htab->elf.sgot->contents + htab->tlsdesc_got);
6397
6398 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
6399 abed->plt0_entry, abed->plt_entry_size);
6400
6401 /* Add offset for pushq GOT+8(%rip), since the
6402 instruction uses 6 bytes subtract this value. */
6403 bfd_put_32 (output_bfd,
6404 (htab->elf.sgotplt->output_section->vma
6405 + htab->elf.sgotplt->output_offset
6406 + 8
6407 - htab->elf.splt->output_section->vma
6408 - htab->elf.splt->output_offset
6409 - htab->tlsdesc_plt
6410 - 6),
6411 htab->elf.splt->contents
6412 + htab->tlsdesc_plt + abed->plt0_got1_offset);
6413 /* Add offset for the PC-relative instruction accessing GOT+TDG,
6414 where TGD stands for htab->tlsdesc_got, subtracting the offset
6415 to the end of that instruction. */
6416 bfd_put_32 (output_bfd,
6417 (htab->elf.sgot->output_section->vma
6418 + htab->elf.sgot->output_offset
6419 + htab->tlsdesc_got
6420 - htab->elf.splt->output_section->vma
6421 - htab->elf.splt->output_offset
6422 - htab->tlsdesc_plt
6423 - abed->plt0_got2_insn_end),
6424 htab->elf.splt->contents
6425 + htab->tlsdesc_plt + abed->plt0_got2_offset);
6426 }
6427 }
6428 }
6429
6430 if (htab->plt_bnd != NULL)
6431 elf_section_data (htab->plt_bnd->output_section)
6432 ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry);
6433
6434 if (htab->elf.sgotplt)
6435 {
6436 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
6437 {
6438 _bfd_error_handler
6439 (_("discarded output section: `%A'"), htab->elf.sgotplt);
6440 return FALSE;
6441 }
6442
6443 /* Fill in the first three entries in the global offset table. */
6444 if (htab->elf.sgotplt->size > 0)
6445 {
6446 /* Set the first entry in the global offset table to the address of
6447 the dynamic section. */
6448 if (sdyn == NULL)
6449 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
6450 else
6451 bfd_put_64 (output_bfd,
6452 sdyn->output_section->vma + sdyn->output_offset,
6453 htab->elf.sgotplt->contents);
6454 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
6455 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
6456 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
6457 }
6458
6459 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
6460 GOT_ENTRY_SIZE;
6461 }
6462
6463 /* Adjust .eh_frame for .plt section. */
6464 if (htab->plt_eh_frame != NULL
6465 && htab->plt_eh_frame->contents != NULL)
6466 {
6467 if (htab->elf.splt != NULL
6468 && htab->elf.splt->size != 0
6469 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
6470 && htab->elf.splt->output_section != NULL
6471 && htab->plt_eh_frame->output_section != NULL)
6472 {
6473 bfd_vma plt_start = htab->elf.splt->output_section->vma;
6474 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
6475 + htab->plt_eh_frame->output_offset
6476 + PLT_FDE_START_OFFSET;
6477 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6478 htab->plt_eh_frame->contents
6479 + PLT_FDE_START_OFFSET);
6480 }
6481 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
6482 {
6483 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6484 htab->plt_eh_frame,
6485 htab->plt_eh_frame->contents))
6486 return FALSE;
6487 }
6488 }
6489
6490 /* Adjust .eh_frame for .plt.got section. */
6491 if (htab->plt_got_eh_frame != NULL
6492 && htab->plt_got_eh_frame->contents != NULL)
6493 {
6494 if (htab->plt_got != NULL
6495 && htab->plt_got->size != 0
6496 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
6497 && htab->plt_got->output_section != NULL
6498 && htab->plt_got_eh_frame->output_section != NULL)
6499 {
6500 bfd_vma plt_start = htab->plt_got->output_section->vma;
6501 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
6502 + htab->plt_got_eh_frame->output_offset
6503 + PLT_FDE_START_OFFSET;
6504 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6505 htab->plt_got_eh_frame->contents
6506 + PLT_FDE_START_OFFSET);
6507 }
6508 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
6509 {
6510 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6511 htab->plt_got_eh_frame,
6512 htab->plt_got_eh_frame->contents))
6513 return FALSE;
6514 }
6515 }
6516
6517 /* Adjust .eh_frame for .plt.bnd section. */
6518 if (htab->plt_bnd_eh_frame != NULL
6519 && htab->plt_bnd_eh_frame->contents != NULL)
6520 {
6521 if (htab->plt_bnd != NULL
6522 && htab->plt_bnd->size != 0
6523 && (htab->plt_bnd->flags & SEC_EXCLUDE) == 0
6524 && htab->plt_bnd->output_section != NULL
6525 && htab->plt_bnd_eh_frame->output_section != NULL)
6526 {
6527 bfd_vma plt_start = htab->plt_bnd->output_section->vma;
6528 bfd_vma eh_frame_start = htab->plt_bnd_eh_frame->output_section->vma
6529 + htab->plt_bnd_eh_frame->output_offset
6530 + PLT_FDE_START_OFFSET;
6531 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6532 htab->plt_bnd_eh_frame->contents
6533 + PLT_FDE_START_OFFSET);
6534 }
6535 if (htab->plt_bnd_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
6536 {
6537 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6538 htab->plt_bnd_eh_frame,
6539 htab->plt_bnd_eh_frame->contents))
6540 return FALSE;
6541 }
6542 }
6543
6544 if (htab->elf.sgot && htab->elf.sgot->size > 0)
6545 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
6546 = GOT_ENTRY_SIZE;
6547
6548 /* Fill PLT entries for undefined weak symbols in PIE. */
6549 if (bfd_link_pie (info))
6550 bfd_hash_traverse (&info->hash->table,
6551 elf_x86_64_pie_finish_undefweak_symbol,
6552 info);
6553
6554 return TRUE;
6555 }
6556
6557 /* Fill PLT/GOT entries and allocate dynamic relocations for local
6558 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
6559 It has to be done before elf_link_sort_relocs is called so that
6560 dynamic relocations are properly sorted. */
6561
6562 static bfd_boolean
6563 elf_x86_64_output_arch_local_syms
6564 (bfd *output_bfd ATTRIBUTE_UNUSED,
6565 struct bfd_link_info *info,
6566 void *flaginfo ATTRIBUTE_UNUSED,
6567 int (*func) (void *, const char *,
6568 Elf_Internal_Sym *,
6569 asection *,
6570 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
6571 {
6572 struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
6573 if (htab == NULL)
6574 return FALSE;
6575
6576 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
6577 htab_traverse (htab->loc_hash_table,
6578 elf_x86_64_finish_local_dynamic_symbol,
6579 info);
6580
6581 return TRUE;
6582 }
6583
6584 /* Return an array of PLT entry symbol values. */
6585
6586 static bfd_vma *
6587 elf_x86_64_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
6588 asection *relplt)
6589 {
6590 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
6591 arelent *p;
6592 long count, i;
6593 bfd_vma *plt_sym_val;
6594 bfd_vma plt_offset;
6595 bfd_byte *plt_contents;
6596 const struct elf_x86_64_backend_data *bed;
6597 Elf_Internal_Shdr *hdr;
6598 asection *plt_bnd;
6599
6600 /* Get the .plt section contents. PLT passed down may point to the
6601 .plt.bnd section. Make sure that PLT always points to the .plt
6602 section. */
6603 plt_bnd = bfd_get_section_by_name (abfd, ".plt.bnd");
6604 if (plt_bnd)
6605 {
6606 if (plt != plt_bnd)
6607 abort ();
6608 plt = bfd_get_section_by_name (abfd, ".plt");
6609 if (plt == NULL)
6610 abort ();
6611 bed = &elf_x86_64_bnd_arch_bed;
6612 }
6613 else
6614 bed = get_elf_x86_64_backend_data (abfd);
6615
6616 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
6617 if (plt_contents == NULL)
6618 return NULL;
6619 if (!bfd_get_section_contents (abfd, (asection *) plt,
6620 plt_contents, 0, plt->size))
6621 {
6622 bad_return:
6623 free (plt_contents);
6624 return NULL;
6625 }
6626
6627 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
6628 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
6629 goto bad_return;
6630
6631 hdr = &elf_section_data (relplt)->this_hdr;
6632 count = relplt->size / hdr->sh_entsize;
6633
6634 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
6635 if (plt_sym_val == NULL)
6636 goto bad_return;
6637
6638 for (i = 0; i < count; i++)
6639 plt_sym_val[i] = -1;
6640
6641 plt_offset = bed->plt_entry_size;
6642 p = relplt->relocation;
6643 for (i = 0; i < count; i++, p++)
6644 {
6645 long reloc_index;
6646
6647 /* Skip unknown relocation. */
6648 if (p->howto == NULL)
6649 continue;
6650
6651 if (p->howto->type != R_X86_64_JUMP_SLOT
6652 && p->howto->type != R_X86_64_IRELATIVE)
6653 continue;
6654
6655 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
6656 + bed->plt_reloc_offset));
6657 if (reloc_index < count)
6658 {
6659 if (plt_bnd)
6660 {
6661 /* This is the index in .plt section. */
6662 long plt_index = plt_offset / bed->plt_entry_size;
6663 /* Store VMA + the offset in .plt.bnd section. */
6664 plt_sym_val[reloc_index] =
6665 (plt_bnd->vma
6666 + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
6667 }
6668 else
6669 plt_sym_val[reloc_index] = plt->vma + plt_offset;
6670 }
6671 plt_offset += bed->plt_entry_size;
6672
6673 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6674 section. */
6675 if (plt_offset >= plt->size)
6676 break;
6677 }
6678
6679 free (plt_contents);
6680
6681 return plt_sym_val;
6682 }
6683
6684 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6685 support. */
6686
6687 static long
6688 elf_x86_64_get_synthetic_symtab (bfd *abfd,
6689 long symcount,
6690 asymbol **syms,
6691 long dynsymcount,
6692 asymbol **dynsyms,
6693 asymbol **ret)
6694 {
6695 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6696 as PLT if it exists. */
6697 asection *plt = bfd_get_section_by_name (abfd, ".plt.bnd");
6698 if (plt == NULL)
6699 plt = bfd_get_section_by_name (abfd, ".plt");
6700 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
6701 dynsymcount, dynsyms, ret,
6702 plt,
6703 elf_x86_64_get_plt_sym_val);
6704 }
6705
6706 /* Handle an x86-64 specific section when reading an object file. This
6707 is called when elfcode.h finds a section with an unknown type. */
6708
6709 static bfd_boolean
6710 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
6711 const char *name, int shindex)
6712 {
6713 if (hdr->sh_type != SHT_X86_64_UNWIND)
6714 return FALSE;
6715
6716 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
6717 return FALSE;
6718
6719 return TRUE;
6720 }
6721
6722 /* Hook called by the linker routine which adds symbols from an object
6723 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6724 of .bss. */
6725
6726 static bfd_boolean
6727 elf_x86_64_add_symbol_hook (bfd *abfd,
6728 struct bfd_link_info *info ATTRIBUTE_UNUSED,
6729 Elf_Internal_Sym *sym,
6730 const char **namep ATTRIBUTE_UNUSED,
6731 flagword *flagsp ATTRIBUTE_UNUSED,
6732 asection **secp,
6733 bfd_vma *valp)
6734 {
6735 asection *lcomm;
6736
6737 switch (sym->st_shndx)
6738 {
6739 case SHN_X86_64_LCOMMON:
6740 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
6741 if (lcomm == NULL)
6742 {
6743 lcomm = bfd_make_section_with_flags (abfd,
6744 "LARGE_COMMON",
6745 (SEC_ALLOC
6746 | SEC_IS_COMMON
6747 | SEC_LINKER_CREATED));
6748 if (lcomm == NULL)
6749 return FALSE;
6750 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
6751 }
6752 *secp = lcomm;
6753 *valp = sym->st_size;
6754 return TRUE;
6755 }
6756
6757 return TRUE;
6758 }
6759
6760
6761 /* Given a BFD section, try to locate the corresponding ELF section
6762 index. */
6763
6764 static bfd_boolean
6765 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
6766 asection *sec, int *index_return)
6767 {
6768 if (sec == &_bfd_elf_large_com_section)
6769 {
6770 *index_return = SHN_X86_64_LCOMMON;
6771 return TRUE;
6772 }
6773 return FALSE;
6774 }
6775
6776 /* Process a symbol. */
6777
6778 static void
6779 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
6780 asymbol *asym)
6781 {
6782 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
6783
6784 switch (elfsym->internal_elf_sym.st_shndx)
6785 {
6786 case SHN_X86_64_LCOMMON:
6787 asym->section = &_bfd_elf_large_com_section;
6788 asym->value = elfsym->internal_elf_sym.st_size;
6789 /* Common symbol doesn't set BSF_GLOBAL. */
6790 asym->flags &= ~BSF_GLOBAL;
6791 break;
6792 }
6793 }
6794
6795 static bfd_boolean
6796 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
6797 {
6798 return (sym->st_shndx == SHN_COMMON
6799 || sym->st_shndx == SHN_X86_64_LCOMMON);
6800 }
6801
6802 static unsigned int
6803 elf_x86_64_common_section_index (asection *sec)
6804 {
6805 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6806 return SHN_COMMON;
6807 else
6808 return SHN_X86_64_LCOMMON;
6809 }
6810
6811 static asection *
6812 elf_x86_64_common_section (asection *sec)
6813 {
6814 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6815 return bfd_com_section_ptr;
6816 else
6817 return &_bfd_elf_large_com_section;
6818 }
6819
6820 static bfd_boolean
6821 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
6822 const Elf_Internal_Sym *sym,
6823 asection **psec,
6824 bfd_boolean newdef,
6825 bfd_boolean olddef,
6826 bfd *oldbfd,
6827 const asection *oldsec)
6828 {
6829 /* A normal common symbol and a large common symbol result in a
6830 normal common symbol. We turn the large common symbol into a
6831 normal one. */
6832 if (!olddef
6833 && h->root.type == bfd_link_hash_common
6834 && !newdef
6835 && bfd_is_com_section (*psec)
6836 && oldsec != *psec)
6837 {
6838 if (sym->st_shndx == SHN_COMMON
6839 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
6840 {
6841 h->root.u.c.p->section
6842 = bfd_make_section_old_way (oldbfd, "COMMON");
6843 h->root.u.c.p->section->flags = SEC_ALLOC;
6844 }
6845 else if (sym->st_shndx == SHN_X86_64_LCOMMON
6846 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
6847 *psec = bfd_com_section_ptr;
6848 }
6849
6850 return TRUE;
6851 }
6852
6853 static int
6854 elf_x86_64_additional_program_headers (bfd *abfd,
6855 struct bfd_link_info *info ATTRIBUTE_UNUSED)
6856 {
6857 asection *s;
6858 int count = 0;
6859
6860 /* Check to see if we need a large readonly segment. */
6861 s = bfd_get_section_by_name (abfd, ".lrodata");
6862 if (s && (s->flags & SEC_LOAD))
6863 count++;
6864
6865 /* Check to see if we need a large data segment. Since .lbss sections
6866 is placed right after the .bss section, there should be no need for
6867 a large data segment just because of .lbss. */
6868 s = bfd_get_section_by_name (abfd, ".ldata");
6869 if (s && (s->flags & SEC_LOAD))
6870 count++;
6871
6872 return count;
6873 }
6874
6875 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6876
6877 static bfd_boolean
6878 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
6879 {
6880 if (h->plt.offset != (bfd_vma) -1
6881 && !h->def_regular
6882 && !h->pointer_equality_needed)
6883 return FALSE;
6884
6885 return _bfd_elf_hash_symbol (h);
6886 }
6887
6888 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6889
6890 static bfd_boolean
6891 elf_x86_64_relocs_compatible (const bfd_target *input,
6892 const bfd_target *output)
6893 {
6894 return ((xvec_get_elf_backend_data (input)->s->elfclass
6895 == xvec_get_elf_backend_data (output)->s->elfclass)
6896 && _bfd_elf_relocs_compatible (input, output));
6897 }
6898
6899 static const struct bfd_elf_special_section
6900 elf_x86_64_special_sections[]=
6901 {
6902 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6903 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6904 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
6905 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6906 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6907 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6908 { NULL, 0, 0, 0, 0 }
6909 };
6910
6911 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6912 #define TARGET_LITTLE_NAME "elf64-x86-64"
6913 #define ELF_ARCH bfd_arch_i386
6914 #define ELF_TARGET_ID X86_64_ELF_DATA
6915 #define ELF_MACHINE_CODE EM_X86_64
6916 #define ELF_MAXPAGESIZE 0x200000
6917 #define ELF_MINPAGESIZE 0x1000
6918 #define ELF_COMMONPAGESIZE 0x1000
6919
6920 #define elf_backend_can_gc_sections 1
6921 #define elf_backend_can_refcount 1
6922 #define elf_backend_want_got_plt 1
6923 #define elf_backend_plt_readonly 1
6924 #define elf_backend_want_plt_sym 0
6925 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6926 #define elf_backend_rela_normal 1
6927 #define elf_backend_plt_alignment 4
6928 #define elf_backend_extern_protected_data 1
6929 #define elf_backend_caches_rawsize 1
6930 #define elf_backend_dtrel_excludes_plt 1
6931 #define elf_backend_want_dynrelro 1
6932
6933 #define elf_info_to_howto elf_x86_64_info_to_howto
6934
6935 #define bfd_elf64_bfd_link_hash_table_create \
6936 elf_x86_64_link_hash_table_create
6937 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6938 #define bfd_elf64_bfd_reloc_name_lookup \
6939 elf_x86_64_reloc_name_lookup
6940
6941 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6942 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6943 #define elf_backend_check_relocs elf_x86_64_check_relocs
6944 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6945 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6946 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6947 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6948 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
6949 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6950 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6951 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6952 #ifdef CORE_HEADER
6953 #define elf_backend_write_core_note elf_x86_64_write_core_note
6954 #endif
6955 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6956 #define elf_backend_relocate_section elf_x86_64_relocate_section
6957 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6958 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6959 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6960 #define elf_backend_object_p elf64_x86_64_elf_object_p
6961 #define bfd_elf64_mkobject elf_x86_64_mkobject
6962 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6963
6964 #define elf_backend_section_from_shdr \
6965 elf_x86_64_section_from_shdr
6966
6967 #define elf_backend_section_from_bfd_section \
6968 elf_x86_64_elf_section_from_bfd_section
6969 #define elf_backend_add_symbol_hook \
6970 elf_x86_64_add_symbol_hook
6971 #define elf_backend_symbol_processing \
6972 elf_x86_64_symbol_processing
6973 #define elf_backend_common_section_index \
6974 elf_x86_64_common_section_index
6975 #define elf_backend_common_section \
6976 elf_x86_64_common_section
6977 #define elf_backend_common_definition \
6978 elf_x86_64_common_definition
6979 #define elf_backend_merge_symbol \
6980 elf_x86_64_merge_symbol
6981 #define elf_backend_special_sections \
6982 elf_x86_64_special_sections
6983 #define elf_backend_additional_program_headers \
6984 elf_x86_64_additional_program_headers
6985 #define elf_backend_hash_symbol \
6986 elf_x86_64_hash_symbol
6987 #define elf_backend_omit_section_dynsym \
6988 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
6989 #define elf_backend_fixup_symbol \
6990 elf_x86_64_fixup_symbol
6991
6992 #include "elf64-target.h"
6993
6994 /* CloudABI support. */
6995
6996 #undef TARGET_LITTLE_SYM
6997 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6998 #undef TARGET_LITTLE_NAME
6999 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
7000
7001 #undef ELF_OSABI
7002 #define ELF_OSABI ELFOSABI_CLOUDABI
7003
7004 #undef elf64_bed
7005 #define elf64_bed elf64_x86_64_cloudabi_bed
7006
7007 #include "elf64-target.h"
7008
7009 /* FreeBSD support. */
7010
7011 #undef TARGET_LITTLE_SYM
7012 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
7013 #undef TARGET_LITTLE_NAME
7014 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
7015
7016 #undef ELF_OSABI
7017 #define ELF_OSABI ELFOSABI_FREEBSD
7018
7019 #undef elf64_bed
7020 #define elf64_bed elf64_x86_64_fbsd_bed
7021
7022 #include "elf64-target.h"
7023
7024 /* Solaris 2 support. */
7025
7026 #undef TARGET_LITTLE_SYM
7027 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
7028 #undef TARGET_LITTLE_NAME
7029 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
7030
7031 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
7032 objects won't be recognized. */
7033 #undef ELF_OSABI
7034
7035 #undef elf64_bed
7036 #define elf64_bed elf64_x86_64_sol2_bed
7037
7038 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
7039 boundary. */
7040 #undef elf_backend_static_tls_alignment
7041 #define elf_backend_static_tls_alignment 16
7042
7043 /* The Solaris 2 ABI requires a plt symbol on all platforms.
7044
7045 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
7046 File, p.63. */
7047 #undef elf_backend_want_plt_sym
7048 #define elf_backend_want_plt_sym 1
7049
7050 #undef elf_backend_strtab_flags
7051 #define elf_backend_strtab_flags SHF_STRINGS
7052
7053 static bfd_boolean
7054 elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
7055 bfd *obfd ATTRIBUTE_UNUSED,
7056 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
7057 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
7058 {
7059 /* PR 19938: FIXME: Need to add code for setting the sh_info
7060 and sh_link fields of Solaris specific section types. */
7061 return FALSE;
7062 }
7063
7064 #undef elf_backend_copy_special_section_fields
7065 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
7066
7067 #include "elf64-target.h"
7068
7069 /* Native Client support. */
7070
7071 static bfd_boolean
7072 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
7073 {
7074 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
7075 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
7076 return TRUE;
7077 }
7078
7079 #undef TARGET_LITTLE_SYM
7080 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
7081 #undef TARGET_LITTLE_NAME
7082 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
7083 #undef elf64_bed
7084 #define elf64_bed elf64_x86_64_nacl_bed
7085
7086 #undef ELF_MAXPAGESIZE
7087 #undef ELF_MINPAGESIZE
7088 #undef ELF_COMMONPAGESIZE
7089 #define ELF_MAXPAGESIZE 0x10000
7090 #define ELF_MINPAGESIZE 0x10000
7091 #define ELF_COMMONPAGESIZE 0x10000
7092
7093 /* Restore defaults. */
7094 #undef ELF_OSABI
7095 #undef elf_backend_static_tls_alignment
7096 #undef elf_backend_want_plt_sym
7097 #define elf_backend_want_plt_sym 0
7098 #undef elf_backend_strtab_flags
7099 #undef elf_backend_copy_special_section_fields
7100
7101 /* NaCl uses substantially different PLT entries for the same effects. */
7102
7103 #undef elf_backend_plt_alignment
7104 #define elf_backend_plt_alignment 5
7105 #define NACL_PLT_ENTRY_SIZE 64
7106 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
7107
7108 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
7109 {
7110 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
7111 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
7112 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
7113 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
7114 0x41, 0xff, 0xe3, /* jmpq *%r11 */
7115
7116 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
7117 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
7118
7119 /* 32 bytes of nop to pad out to the standard size. */
7120 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7121 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7122 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7123 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7124 0x66, /* excess data16 prefix */
7125 0x90 /* nop */
7126 };
7127
7128 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
7129 {
7130 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
7131 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
7132 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
7133 0x41, 0xff, 0xe3, /* jmpq *%r11 */
7134
7135 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
7136 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7137 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7138
7139 /* Lazy GOT entries point here (32-byte aligned). */
7140 0x68, /* pushq immediate */
7141 0, 0, 0, 0, /* replaced with index into relocation table. */
7142 0xe9, /* jmp relative */
7143 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
7144
7145 /* 22 bytes of nop to pad out to the standard size. */
7146 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7147 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7148 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
7149 };
7150
7151 /* .eh_frame covering the .plt section. */
7152
7153 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
7154 {
7155 #if (PLT_CIE_LENGTH != 20 \
7156 || PLT_FDE_LENGTH != 36 \
7157 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
7158 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
7159 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
7160 #endif
7161 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
7162 0, 0, 0, 0, /* CIE ID */
7163 1, /* CIE version */
7164 'z', 'R', 0, /* Augmentation string */
7165 1, /* Code alignment factor */
7166 0x78, /* Data alignment factor */
7167 16, /* Return address column */
7168 1, /* Augmentation size */
7169 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
7170 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
7171 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
7172 DW_CFA_nop, DW_CFA_nop,
7173
7174 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
7175 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
7176 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
7177 0, 0, 0, 0, /* .plt size goes here */
7178 0, /* Augmentation size */
7179 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
7180 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
7181 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
7182 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
7183 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
7184 13, /* Block length */
7185 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
7186 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
7187 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
7188 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
7189 DW_CFA_nop, DW_CFA_nop
7190 };
7191
7192 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
7193 {
7194 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
7195 elf_x86_64_nacl_plt_entry, /* plt_entry */
7196 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
7197 2, /* plt0_got1_offset */
7198 9, /* plt0_got2_offset */
7199 13, /* plt0_got2_insn_end */
7200 3, /* plt_got_offset */
7201 33, /* plt_reloc_offset */
7202 38, /* plt_plt_offset */
7203 7, /* plt_got_insn_size */
7204 42, /* plt_plt_insn_end */
7205 32, /* plt_lazy_offset */
7206 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
7207 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
7208 NULL, /* eh_frame_plt_got */
7209 0, /* eh_frame_plt_got_size */
7210 };
7211
7212 #undef elf_backend_arch_data
7213 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
7214
7215 #undef elf_backend_object_p
7216 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
7217 #undef elf_backend_modify_segment_map
7218 #define elf_backend_modify_segment_map nacl_modify_segment_map
7219 #undef elf_backend_modify_program_headers
7220 #define elf_backend_modify_program_headers nacl_modify_program_headers
7221 #undef elf_backend_final_write_processing
7222 #define elf_backend_final_write_processing nacl_final_write_processing
7223
7224 #include "elf64-target.h"
7225
7226 /* Native Client x32 support. */
7227
7228 static bfd_boolean
7229 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
7230 {
7231 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
7232 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
7233 return TRUE;
7234 }
7235
7236 #undef TARGET_LITTLE_SYM
7237 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
7238 #undef TARGET_LITTLE_NAME
7239 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
7240 #undef elf32_bed
7241 #define elf32_bed elf32_x86_64_nacl_bed
7242
7243 #define bfd_elf32_bfd_link_hash_table_create \
7244 elf_x86_64_link_hash_table_create
7245 #define bfd_elf32_bfd_reloc_type_lookup \
7246 elf_x86_64_reloc_type_lookup
7247 #define bfd_elf32_bfd_reloc_name_lookup \
7248 elf_x86_64_reloc_name_lookup
7249 #define bfd_elf32_mkobject \
7250 elf_x86_64_mkobject
7251 #define bfd_elf32_get_synthetic_symtab \
7252 elf_x86_64_get_synthetic_symtab
7253
7254 #undef elf_backend_object_p
7255 #define elf_backend_object_p \
7256 elf32_x86_64_nacl_elf_object_p
7257
7258 #undef elf_backend_bfd_from_remote_memory
7259 #define elf_backend_bfd_from_remote_memory \
7260 _bfd_elf32_bfd_from_remote_memory
7261
7262 #undef elf_backend_size_info
7263 #define elf_backend_size_info \
7264 _bfd_elf32_size_info
7265
7266 #include "elf32-target.h"
7267
7268 /* Restore defaults. */
7269 #undef elf_backend_object_p
7270 #define elf_backend_object_p elf64_x86_64_elf_object_p
7271 #undef elf_backend_bfd_from_remote_memory
7272 #undef elf_backend_size_info
7273 #undef elf_backend_modify_segment_map
7274 #undef elf_backend_modify_program_headers
7275 #undef elf_backend_final_write_processing
7276
7277 /* Intel L1OM support. */
7278
7279 static bfd_boolean
7280 elf64_l1om_elf_object_p (bfd *abfd)
7281 {
7282 /* Set the right machine number for an L1OM elf64 file. */
7283 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
7284 return TRUE;
7285 }
7286
7287 #undef TARGET_LITTLE_SYM
7288 #define TARGET_LITTLE_SYM l1om_elf64_vec
7289 #undef TARGET_LITTLE_NAME
7290 #define TARGET_LITTLE_NAME "elf64-l1om"
7291 #undef ELF_ARCH
7292 #define ELF_ARCH bfd_arch_l1om
7293
7294 #undef ELF_MACHINE_CODE
7295 #define ELF_MACHINE_CODE EM_L1OM
7296
7297 #undef ELF_OSABI
7298
7299 #undef elf64_bed
7300 #define elf64_bed elf64_l1om_bed
7301
7302 #undef elf_backend_object_p
7303 #define elf_backend_object_p elf64_l1om_elf_object_p
7304
7305 /* Restore defaults. */
7306 #undef ELF_MAXPAGESIZE
7307 #undef ELF_MINPAGESIZE
7308 #undef ELF_COMMONPAGESIZE
7309 #define ELF_MAXPAGESIZE 0x200000
7310 #define ELF_MINPAGESIZE 0x1000
7311 #define ELF_COMMONPAGESIZE 0x1000
7312 #undef elf_backend_plt_alignment
7313 #define elf_backend_plt_alignment 4
7314 #undef elf_backend_arch_data
7315 #define elf_backend_arch_data &elf_x86_64_arch_bed
7316
7317 #include "elf64-target.h"
7318
7319 /* FreeBSD L1OM support. */
7320
7321 #undef TARGET_LITTLE_SYM
7322 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
7323 #undef TARGET_LITTLE_NAME
7324 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
7325
7326 #undef ELF_OSABI
7327 #define ELF_OSABI ELFOSABI_FREEBSD
7328
7329 #undef elf64_bed
7330 #define elf64_bed elf64_l1om_fbsd_bed
7331
7332 #include "elf64-target.h"
7333
7334 /* Intel K1OM support. */
7335
7336 static bfd_boolean
7337 elf64_k1om_elf_object_p (bfd *abfd)
7338 {
7339 /* Set the right machine number for an K1OM elf64 file. */
7340 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
7341 return TRUE;
7342 }
7343
7344 #undef TARGET_LITTLE_SYM
7345 #define TARGET_LITTLE_SYM k1om_elf64_vec
7346 #undef TARGET_LITTLE_NAME
7347 #define TARGET_LITTLE_NAME "elf64-k1om"
7348 #undef ELF_ARCH
7349 #define ELF_ARCH bfd_arch_k1om
7350
7351 #undef ELF_MACHINE_CODE
7352 #define ELF_MACHINE_CODE EM_K1OM
7353
7354 #undef ELF_OSABI
7355
7356 #undef elf64_bed
7357 #define elf64_bed elf64_k1om_bed
7358
7359 #undef elf_backend_object_p
7360 #define elf_backend_object_p elf64_k1om_elf_object_p
7361
7362 #undef elf_backend_static_tls_alignment
7363
7364 #undef elf_backend_want_plt_sym
7365 #define elf_backend_want_plt_sym 0
7366
7367 #include "elf64-target.h"
7368
7369 /* FreeBSD K1OM support. */
7370
7371 #undef TARGET_LITTLE_SYM
7372 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
7373 #undef TARGET_LITTLE_NAME
7374 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
7375
7376 #undef ELF_OSABI
7377 #define ELF_OSABI ELFOSABI_FREEBSD
7378
7379 #undef elf64_bed
7380 #define elf64_bed elf64_k1om_fbsd_bed
7381
7382 #include "elf64-target.h"
7383
7384 /* 32bit x86-64 support. */
7385
7386 #undef TARGET_LITTLE_SYM
7387 #define TARGET_LITTLE_SYM x86_64_elf32_vec
7388 #undef TARGET_LITTLE_NAME
7389 #define TARGET_LITTLE_NAME "elf32-x86-64"
7390 #undef elf32_bed
7391
7392 #undef ELF_ARCH
7393 #define ELF_ARCH bfd_arch_i386
7394
7395 #undef ELF_MACHINE_CODE
7396 #define ELF_MACHINE_CODE EM_X86_64
7397
7398 #undef ELF_OSABI
7399
7400 #undef elf_backend_object_p
7401 #define elf_backend_object_p \
7402 elf32_x86_64_elf_object_p
7403
7404 #undef elf_backend_bfd_from_remote_memory
7405 #define elf_backend_bfd_from_remote_memory \
7406 _bfd_elf32_bfd_from_remote_memory
7407
7408 #undef elf_backend_size_info
7409 #define elf_backend_size_info \
7410 _bfd_elf32_size_info
7411
7412 #include "elf32-target.h"
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