[x86] Resolve non-PIC undefweak symbols in executable
[deliverable/binutils-gdb.git] / bfd / elf64-x86-64.c
1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2016 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf-nacl.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32 #include "libiberty.h"
33
34 #include "opcode/i386.h"
35 #include "elf/x86-64.h"
36
37 #ifdef CORE_HEADER
38 #include <stdarg.h>
39 #include CORE_HEADER
40 #endif
41
42 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
43 #define MINUS_ONE (~ (bfd_vma) 0)
44
45 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
46 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
47 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
48 since they are the same. */
49
50 #define ABI_64_P(abfd) \
51 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
52
53 /* The relocation "howto" table. Order of fields:
54 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
55 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
56 static reloc_howto_type x86_64_elf_howto_table[] =
57 {
58 HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
59 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
60 FALSE),
61 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
63 FALSE),
64 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
65 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
66 TRUE),
67 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
68 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
69 FALSE),
70 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
71 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
72 TRUE),
73 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
74 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
75 FALSE),
76 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
78 MINUS_ONE, FALSE),
79 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
81 MINUS_ONE, FALSE),
82 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
84 MINUS_ONE, FALSE),
85 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
86 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
87 0xffffffff, TRUE),
88 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
89 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
90 FALSE),
91 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
92 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
93 FALSE),
94 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
96 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
98 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
100 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
101 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
102 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
104 MINUS_ONE, FALSE),
105 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
107 MINUS_ONE, FALSE),
108 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
110 MINUS_ONE, FALSE),
111 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
112 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
113 0xffffffff, TRUE),
114 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
115 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
116 0xffffffff, TRUE),
117 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
118 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
119 0xffffffff, FALSE),
120 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
121 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
122 0xffffffff, TRUE),
123 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
124 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
125 0xffffffff, FALSE),
126 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
128 TRUE),
129 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
131 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
132 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
133 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
134 FALSE, 0xffffffff, 0xffffffff, TRUE),
135 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
136 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
137 FALSE),
138 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
139 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
140 MINUS_ONE, TRUE),
141 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
142 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
143 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
144 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
145 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
146 MINUS_ONE, FALSE),
147 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
148 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
149 MINUS_ONE, FALSE),
150 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
151 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
152 FALSE),
153 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
154 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
155 FALSE),
156 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
157 complain_overflow_bitfield, bfd_elf_generic_reloc,
158 "R_X86_64_GOTPC32_TLSDESC",
159 FALSE, 0xffffffff, 0xffffffff, TRUE),
160 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
161 complain_overflow_dont, bfd_elf_generic_reloc,
162 "R_X86_64_TLSDESC_CALL",
163 FALSE, 0, 0, FALSE),
164 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
165 complain_overflow_bitfield, bfd_elf_generic_reloc,
166 "R_X86_64_TLSDESC",
167 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
168 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
169 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
170 MINUS_ONE, FALSE),
171 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
172 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
173 MINUS_ONE, FALSE),
174 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
175 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
176 TRUE),
177 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
178 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
179 TRUE),
180 HOWTO(R_X86_64_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
181 bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", FALSE, 0xffffffff,
182 0xffffffff, TRUE),
183 HOWTO(R_X86_64_REX_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
184 bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", FALSE, 0xffffffff,
185 0xffffffff, TRUE),
186
187 /* We have a gap in the reloc numbers here.
188 R_X86_64_standard counts the number up to this point, and
189 R_X86_64_vt_offset is the value to subtract from a reloc type of
190 R_X86_64_GNU_VT* to form an index into this table. */
191 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
192 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
193
194 /* GNU extension to record C++ vtable hierarchy. */
195 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
196 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
197
198 /* GNU extension to record C++ vtable member usage. */
199 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
200 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
201 FALSE),
202
203 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
204 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
205 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
206 FALSE)
207 };
208
209 #define IS_X86_64_PCREL_TYPE(TYPE) \
210 ( ((TYPE) == R_X86_64_PC8) \
211 || ((TYPE) == R_X86_64_PC16) \
212 || ((TYPE) == R_X86_64_PC32) \
213 || ((TYPE) == R_X86_64_PC32_BND) \
214 || ((TYPE) == R_X86_64_PC64))
215
216 /* Map BFD relocs to the x86_64 elf relocs. */
217 struct elf_reloc_map
218 {
219 bfd_reloc_code_real_type bfd_reloc_val;
220 unsigned char elf_reloc_val;
221 };
222
223 static const struct elf_reloc_map x86_64_reloc_map[] =
224 {
225 { BFD_RELOC_NONE, R_X86_64_NONE, },
226 { BFD_RELOC_64, R_X86_64_64, },
227 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
228 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
229 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
230 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
231 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
232 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
233 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
234 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
235 { BFD_RELOC_32, R_X86_64_32, },
236 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
237 { BFD_RELOC_16, R_X86_64_16, },
238 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
239 { BFD_RELOC_8, R_X86_64_8, },
240 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
241 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
242 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
243 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
244 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
245 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
246 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
247 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
248 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
249 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
250 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
251 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
252 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
253 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
254 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
255 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
256 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
257 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
258 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
259 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
260 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
261 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
262 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
263 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, },
264 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, },
265 { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, },
266 { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, },
267 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
268 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
269 };
270
271 static reloc_howto_type *
272 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
273 {
274 unsigned i;
275
276 if (r_type == (unsigned int) R_X86_64_32)
277 {
278 if (ABI_64_P (abfd))
279 i = r_type;
280 else
281 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
282 }
283 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
284 || r_type >= (unsigned int) R_X86_64_max)
285 {
286 if (r_type >= (unsigned int) R_X86_64_standard)
287 {
288 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
289 abfd, (int) r_type);
290 r_type = R_X86_64_NONE;
291 }
292 i = r_type;
293 }
294 else
295 i = r_type - (unsigned int) R_X86_64_vt_offset;
296 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
297 return &x86_64_elf_howto_table[i];
298 }
299
300 /* Given a BFD reloc type, return a HOWTO structure. */
301 static reloc_howto_type *
302 elf_x86_64_reloc_type_lookup (bfd *abfd,
303 bfd_reloc_code_real_type code)
304 {
305 unsigned int i;
306
307 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
308 i++)
309 {
310 if (x86_64_reloc_map[i].bfd_reloc_val == code)
311 return elf_x86_64_rtype_to_howto (abfd,
312 x86_64_reloc_map[i].elf_reloc_val);
313 }
314 return NULL;
315 }
316
317 static reloc_howto_type *
318 elf_x86_64_reloc_name_lookup (bfd *abfd,
319 const char *r_name)
320 {
321 unsigned int i;
322
323 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
324 {
325 /* Get x32 R_X86_64_32. */
326 reloc_howto_type *reloc
327 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
328 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
329 return reloc;
330 }
331
332 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
333 if (x86_64_elf_howto_table[i].name != NULL
334 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
335 return &x86_64_elf_howto_table[i];
336
337 return NULL;
338 }
339
340 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
341
342 static void
343 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
344 Elf_Internal_Rela *dst)
345 {
346 unsigned r_type;
347
348 r_type = ELF32_R_TYPE (dst->r_info);
349 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
350 BFD_ASSERT (r_type == cache_ptr->howto->type);
351 }
352 \f
353 /* Support for core dump NOTE sections. */
354 static bfd_boolean
355 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
356 {
357 int offset;
358 size_t size;
359
360 switch (note->descsz)
361 {
362 default:
363 return FALSE;
364
365 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
366 /* pr_cursig */
367 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
368
369 /* pr_pid */
370 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
371
372 /* pr_reg */
373 offset = 72;
374 size = 216;
375
376 break;
377
378 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
379 /* pr_cursig */
380 elf_tdata (abfd)->core->signal
381 = bfd_get_16 (abfd, note->descdata + 12);
382
383 /* pr_pid */
384 elf_tdata (abfd)->core->lwpid
385 = bfd_get_32 (abfd, note->descdata + 32);
386
387 /* pr_reg */
388 offset = 112;
389 size = 216;
390
391 break;
392 }
393
394 /* Make a ".reg/999" section. */
395 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
396 size, note->descpos + offset);
397 }
398
399 static bfd_boolean
400 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
401 {
402 switch (note->descsz)
403 {
404 default:
405 return FALSE;
406
407 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
408 elf_tdata (abfd)->core->pid
409 = bfd_get_32 (abfd, note->descdata + 12);
410 elf_tdata (abfd)->core->program
411 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
412 elf_tdata (abfd)->core->command
413 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
414 break;
415
416 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
417 elf_tdata (abfd)->core->pid
418 = bfd_get_32 (abfd, note->descdata + 24);
419 elf_tdata (abfd)->core->program
420 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
421 elf_tdata (abfd)->core->command
422 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
423 }
424
425 /* Note that for some reason, a spurious space is tacked
426 onto the end of the args in some (at least one anyway)
427 implementations, so strip it off if it exists. */
428
429 {
430 char *command = elf_tdata (abfd)->core->command;
431 int n = strlen (command);
432
433 if (0 < n && command[n - 1] == ' ')
434 command[n - 1] = '\0';
435 }
436
437 return TRUE;
438 }
439
440 #ifdef CORE_HEADER
441 static char *
442 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
443 int note_type, ...)
444 {
445 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
446 va_list ap;
447 const char *fname, *psargs;
448 long pid;
449 int cursig;
450 const void *gregs;
451
452 switch (note_type)
453 {
454 default:
455 return NULL;
456
457 case NT_PRPSINFO:
458 va_start (ap, note_type);
459 fname = va_arg (ap, const char *);
460 psargs = va_arg (ap, const char *);
461 va_end (ap);
462
463 if (bed->s->elfclass == ELFCLASS32)
464 {
465 prpsinfo32_t data;
466 memset (&data, 0, sizeof (data));
467 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
468 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
469 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
470 &data, sizeof (data));
471 }
472 else
473 {
474 prpsinfo64_t data;
475 memset (&data, 0, sizeof (data));
476 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
477 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
478 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
479 &data, sizeof (data));
480 }
481 /* NOTREACHED */
482
483 case NT_PRSTATUS:
484 va_start (ap, note_type);
485 pid = va_arg (ap, long);
486 cursig = va_arg (ap, int);
487 gregs = va_arg (ap, const void *);
488 va_end (ap);
489
490 if (bed->s->elfclass == ELFCLASS32)
491 {
492 if (bed->elf_machine_code == EM_X86_64)
493 {
494 prstatusx32_t prstat;
495 memset (&prstat, 0, sizeof (prstat));
496 prstat.pr_pid = pid;
497 prstat.pr_cursig = cursig;
498 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
499 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
500 &prstat, sizeof (prstat));
501 }
502 else
503 {
504 prstatus32_t prstat;
505 memset (&prstat, 0, sizeof (prstat));
506 prstat.pr_pid = pid;
507 prstat.pr_cursig = cursig;
508 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
509 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
510 &prstat, sizeof (prstat));
511 }
512 }
513 else
514 {
515 prstatus64_t prstat;
516 memset (&prstat, 0, sizeof (prstat));
517 prstat.pr_pid = pid;
518 prstat.pr_cursig = cursig;
519 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
520 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
521 &prstat, sizeof (prstat));
522 }
523 }
524 /* NOTREACHED */
525 }
526 #endif
527 \f
528 /* Functions for the x86-64 ELF linker. */
529
530 /* The name of the dynamic interpreter. This is put in the .interp
531 section. */
532
533 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
534 #define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
535
536 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
537 copying dynamic variables from a shared lib into an app's dynbss
538 section, and instead use a dynamic relocation to point into the
539 shared lib. */
540 #define ELIMINATE_COPY_RELOCS 1
541
542 /* The size in bytes of an entry in the global offset table. */
543
544 #define GOT_ENTRY_SIZE 8
545
546 /* The size in bytes of an entry in the procedure linkage table. */
547
548 #define PLT_ENTRY_SIZE 16
549
550 /* The first entry in a procedure linkage table looks like this. See the
551 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
552
553 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
554 {
555 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
556 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
557 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
558 };
559
560 /* Subsequent entries in a procedure linkage table look like this. */
561
562 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
563 {
564 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
565 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
566 0x68, /* pushq immediate */
567 0, 0, 0, 0, /* replaced with index into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
570 };
571
572 /* The first entry in a procedure linkage table with BND relocations
573 like this. */
574
575 static const bfd_byte elf_x86_64_bnd_plt0_entry[PLT_ENTRY_SIZE] =
576 {
577 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
578 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
579 0x0f, 0x1f, 0 /* nopl (%rax) */
580 };
581
582 /* Subsequent entries for legacy branches in a procedure linkage table
583 with BND relocations look like this. */
584
585 static const bfd_byte elf_x86_64_legacy_plt_entry[PLT_ENTRY_SIZE] =
586 {
587 0x68, 0, 0, 0, 0, /* pushq immediate */
588 0xe9, 0, 0, 0, 0, /* jmpq relative */
589 0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
590 };
591
592 /* Subsequent entries for branches with BND prefx in a procedure linkage
593 table with BND relocations look like this. */
594
595 static const bfd_byte elf_x86_64_bnd_plt_entry[PLT_ENTRY_SIZE] =
596 {
597 0x68, 0, 0, 0, 0, /* pushq immediate */
598 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
599 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
600 };
601
602 /* Entries for legacy branches in the second procedure linkage table
603 look like this. */
604
605 static const bfd_byte elf_x86_64_legacy_plt2_entry[8] =
606 {
607 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
608 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
610 };
611
612 /* Entries for branches with BND prefix in the second procedure linkage
613 table look like this. */
614
615 static const bfd_byte elf_x86_64_bnd_plt2_entry[8] =
616 {
617 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
618 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
619 0x90 /* nop */
620 };
621
622 /* .eh_frame covering the .plt section. */
623
624 static const bfd_byte elf_x86_64_eh_frame_plt[] =
625 {
626 #define PLT_CIE_LENGTH 20
627 #define PLT_FDE_LENGTH 36
628 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
629 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
630 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
631 0, 0, 0, 0, /* CIE ID */
632 1, /* CIE version */
633 'z', 'R', 0, /* Augmentation string */
634 1, /* Code alignment factor */
635 0x78, /* Data alignment factor */
636 16, /* Return address column */
637 1, /* Augmentation size */
638 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
639 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
640 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
641 DW_CFA_nop, DW_CFA_nop,
642
643 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
644 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
645 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
646 0, 0, 0, 0, /* .plt size goes here */
647 0, /* Augmentation size */
648 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
649 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
650 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
651 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
652 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
653 11, /* Block length */
654 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
655 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
656 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
657 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
658 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
659 };
660
661 /* Architecture-specific backend data for x86-64. */
662
663 struct elf_x86_64_backend_data
664 {
665 /* Templates for the initial PLT entry and for subsequent entries. */
666 const bfd_byte *plt0_entry;
667 const bfd_byte *plt_entry;
668 unsigned int plt_entry_size; /* Size of each PLT entry. */
669
670 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
671 unsigned int plt0_got1_offset;
672 unsigned int plt0_got2_offset;
673
674 /* Offset of the end of the PC-relative instruction containing
675 plt0_got2_offset. */
676 unsigned int plt0_got2_insn_end;
677
678 /* Offsets into plt_entry that are to be replaced with... */
679 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
680 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
681 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
682
683 /* Length of the PC-relative instruction containing plt_got_offset. */
684 unsigned int plt_got_insn_size;
685
686 /* Offset of the end of the PC-relative jump to plt0_entry. */
687 unsigned int plt_plt_insn_end;
688
689 /* Offset into plt_entry where the initial value of the GOT entry points. */
690 unsigned int plt_lazy_offset;
691
692 /* .eh_frame covering the .plt section. */
693 const bfd_byte *eh_frame_plt;
694 unsigned int eh_frame_plt_size;
695 };
696
697 #define get_elf_x86_64_arch_data(bed) \
698 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
699
700 #define get_elf_x86_64_backend_data(abfd) \
701 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
702
703 #define GET_PLT_ENTRY_SIZE(abfd) \
704 get_elf_x86_64_backend_data (abfd)->plt_entry_size
705
706 /* These are the standard parameters. */
707 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
708 {
709 elf_x86_64_plt0_entry, /* plt0_entry */
710 elf_x86_64_plt_entry, /* plt_entry */
711 sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
712 2, /* plt0_got1_offset */
713 8, /* plt0_got2_offset */
714 12, /* plt0_got2_insn_end */
715 2, /* plt_got_offset */
716 7, /* plt_reloc_offset */
717 12, /* plt_plt_offset */
718 6, /* plt_got_insn_size */
719 PLT_ENTRY_SIZE, /* plt_plt_insn_end */
720 6, /* plt_lazy_offset */
721 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
722 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
723 };
724
725 static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed =
726 {
727 elf_x86_64_bnd_plt0_entry, /* plt0_entry */
728 elf_x86_64_bnd_plt_entry, /* plt_entry */
729 sizeof (elf_x86_64_bnd_plt_entry), /* plt_entry_size */
730 2, /* plt0_got1_offset */
731 1+8, /* plt0_got2_offset */
732 1+12, /* plt0_got2_insn_end */
733 1+2, /* plt_got_offset */
734 1, /* plt_reloc_offset */
735 7, /* plt_plt_offset */
736 1+6, /* plt_got_insn_size */
737 11, /* plt_plt_insn_end */
738 0, /* plt_lazy_offset */
739 elf_x86_64_eh_frame_plt, /* eh_frame_plt */
740 sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
741 };
742
743 #define elf_backend_arch_data &elf_x86_64_arch_bed
744
745 /* Is a undefined weak symbol which is resolved to 0. Reference to an
746 undefined weak symbol is resolved to 0 when building executable if
747 it isn't dynamic and
748 1. Has non-GOT/non-PLT relocations in text section. Or
749 2. Has no GOT/PLT relocation.
750 */
751 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
752 ((EH)->elf.root.type == bfd_link_hash_undefweak \
753 && bfd_link_executable (INFO) \
754 && (elf_x86_64_hash_table (INFO)->interp == NULL \
755 || !(EH)->has_got_reloc \
756 || (EH)->has_non_got_reloc \
757 || !(INFO)->dynamic_undefined_weak))
758
759 /* x86-64 ELF linker hash entry. */
760
761 struct elf_x86_64_link_hash_entry
762 {
763 struct elf_link_hash_entry elf;
764
765 /* Track dynamic relocs copied for this symbol. */
766 struct elf_dyn_relocs *dyn_relocs;
767
768 #define GOT_UNKNOWN 0
769 #define GOT_NORMAL 1
770 #define GOT_TLS_GD 2
771 #define GOT_TLS_IE 3
772 #define GOT_TLS_GDESC 4
773 #define GOT_TLS_GD_BOTH_P(type) \
774 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
775 #define GOT_TLS_GD_P(type) \
776 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
777 #define GOT_TLS_GDESC_P(type) \
778 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
779 #define GOT_TLS_GD_ANY_P(type) \
780 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
781 unsigned char tls_type;
782
783 /* TRUE if a weak symbol with a real definition needs a copy reloc.
784 When there is a weak symbol with a real definition, the processor
785 independent code will have arranged for us to see the real
786 definition first. We need to copy the needs_copy bit from the
787 real definition and check it when allowing copy reloc in PIE. */
788 unsigned int needs_copy : 1;
789
790 /* TRUE if symbol has at least one BND relocation. */
791 unsigned int has_bnd_reloc : 1;
792
793 /* TRUE if symbol has GOT or PLT relocations. */
794 unsigned int has_got_reloc : 1;
795
796 /* TRUE if symbol has non-GOT/non-PLT relocations in text sections. */
797 unsigned int has_non_got_reloc : 1;
798
799 /* Reference count of C/C++ function pointer relocations in read-write
800 section which can be resolved at run-time. */
801 bfd_signed_vma func_pointer_refcount;
802
803 /* Information about the GOT PLT entry. Filled when there are both
804 GOT and PLT relocations against the same function. */
805 union gotplt_union plt_got;
806
807 /* Information about the second PLT entry. Filled when has_bnd_reloc is
808 set. */
809 union gotplt_union plt_bnd;
810
811 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
812 starting at the end of the jump table. */
813 bfd_vma tlsdesc_got;
814 };
815
816 #define elf_x86_64_hash_entry(ent) \
817 ((struct elf_x86_64_link_hash_entry *)(ent))
818
819 struct elf_x86_64_obj_tdata
820 {
821 struct elf_obj_tdata root;
822
823 /* tls_type for each local got entry. */
824 char *local_got_tls_type;
825
826 /* GOTPLT entries for TLS descriptors. */
827 bfd_vma *local_tlsdesc_gotent;
828 };
829
830 #define elf_x86_64_tdata(abfd) \
831 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
832
833 #define elf_x86_64_local_got_tls_type(abfd) \
834 (elf_x86_64_tdata (abfd)->local_got_tls_type)
835
836 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
837 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
838
839 #define is_x86_64_elf(bfd) \
840 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
841 && elf_tdata (bfd) != NULL \
842 && elf_object_id (bfd) == X86_64_ELF_DATA)
843
844 static bfd_boolean
845 elf_x86_64_mkobject (bfd *abfd)
846 {
847 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
848 X86_64_ELF_DATA);
849 }
850
851 /* x86-64 ELF linker hash table. */
852
853 struct elf_x86_64_link_hash_table
854 {
855 struct elf_link_hash_table elf;
856
857 /* Short-cuts to get to dynamic linker sections. */
858 asection *interp;
859 asection *sdynbss;
860 asection *srelbss;
861 asection *plt_eh_frame;
862 asection *plt_bnd;
863 asection *plt_got;
864
865 union
866 {
867 bfd_signed_vma refcount;
868 bfd_vma offset;
869 } tls_ld_got;
870
871 /* The amount of space used by the jump slots in the GOT. */
872 bfd_vma sgotplt_jump_table_size;
873
874 /* Small local sym cache. */
875 struct sym_cache sym_cache;
876
877 bfd_vma (*r_info) (bfd_vma, bfd_vma);
878 bfd_vma (*r_sym) (bfd_vma);
879 unsigned int pointer_r_type;
880 const char *dynamic_interpreter;
881 int dynamic_interpreter_size;
882
883 /* _TLS_MODULE_BASE_ symbol. */
884 struct bfd_link_hash_entry *tls_module_base;
885
886 /* Used by local STT_GNU_IFUNC symbols. */
887 htab_t loc_hash_table;
888 void * loc_hash_memory;
889
890 /* The offset into splt of the PLT entry for the TLS descriptor
891 resolver. Special values are 0, if not necessary (or not found
892 to be necessary yet), and -1 if needed but not determined
893 yet. */
894 bfd_vma tlsdesc_plt;
895 /* The offset into sgot of the GOT entry used by the PLT entry
896 above. */
897 bfd_vma tlsdesc_got;
898
899 /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
900 bfd_vma next_jump_slot_index;
901 /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
902 bfd_vma next_irelative_index;
903 };
904
905 /* Get the x86-64 ELF linker hash table from a link_info structure. */
906
907 #define elf_x86_64_hash_table(p) \
908 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
909 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
910
911 #define elf_x86_64_compute_jump_table_size(htab) \
912 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
913
914 /* Create an entry in an x86-64 ELF linker hash table. */
915
916 static struct bfd_hash_entry *
917 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
918 struct bfd_hash_table *table,
919 const char *string)
920 {
921 /* Allocate the structure if it has not already been allocated by a
922 subclass. */
923 if (entry == NULL)
924 {
925 entry = (struct bfd_hash_entry *)
926 bfd_hash_allocate (table,
927 sizeof (struct elf_x86_64_link_hash_entry));
928 if (entry == NULL)
929 return entry;
930 }
931
932 /* Call the allocation method of the superclass. */
933 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
934 if (entry != NULL)
935 {
936 struct elf_x86_64_link_hash_entry *eh;
937
938 eh = (struct elf_x86_64_link_hash_entry *) entry;
939 eh->dyn_relocs = NULL;
940 eh->tls_type = GOT_UNKNOWN;
941 eh->needs_copy = 0;
942 eh->has_bnd_reloc = 0;
943 eh->has_got_reloc = 0;
944 eh->has_non_got_reloc = 0;
945 eh->func_pointer_refcount = 0;
946 eh->plt_bnd.offset = (bfd_vma) -1;
947 eh->plt_got.offset = (bfd_vma) -1;
948 eh->tlsdesc_got = (bfd_vma) -1;
949 }
950
951 return entry;
952 }
953
954 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
955 for local symbol so that we can handle local STT_GNU_IFUNC symbols
956 as global symbol. We reuse indx and dynstr_index for local symbol
957 hash since they aren't used by global symbols in this backend. */
958
959 static hashval_t
960 elf_x86_64_local_htab_hash (const void *ptr)
961 {
962 struct elf_link_hash_entry *h
963 = (struct elf_link_hash_entry *) ptr;
964 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
965 }
966
967 /* Compare local hash entries. */
968
969 static int
970 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
971 {
972 struct elf_link_hash_entry *h1
973 = (struct elf_link_hash_entry *) ptr1;
974 struct elf_link_hash_entry *h2
975 = (struct elf_link_hash_entry *) ptr2;
976
977 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
978 }
979
980 /* Find and/or create a hash entry for local symbol. */
981
982 static struct elf_link_hash_entry *
983 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
984 bfd *abfd, const Elf_Internal_Rela *rel,
985 bfd_boolean create)
986 {
987 struct elf_x86_64_link_hash_entry e, *ret;
988 asection *sec = abfd->sections;
989 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
990 htab->r_sym (rel->r_info));
991 void **slot;
992
993 e.elf.indx = sec->id;
994 e.elf.dynstr_index = htab->r_sym (rel->r_info);
995 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
996 create ? INSERT : NO_INSERT);
997
998 if (!slot)
999 return NULL;
1000
1001 if (*slot)
1002 {
1003 ret = (struct elf_x86_64_link_hash_entry *) *slot;
1004 return &ret->elf;
1005 }
1006
1007 ret = (struct elf_x86_64_link_hash_entry *)
1008 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
1009 sizeof (struct elf_x86_64_link_hash_entry));
1010 if (ret)
1011 {
1012 memset (ret, 0, sizeof (*ret));
1013 ret->elf.indx = sec->id;
1014 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
1015 ret->elf.dynindx = -1;
1016 ret->func_pointer_refcount = 0;
1017 ret->plt_got.offset = (bfd_vma) -1;
1018 *slot = ret;
1019 }
1020 return &ret->elf;
1021 }
1022
1023 /* Destroy an X86-64 ELF linker hash table. */
1024
1025 static void
1026 elf_x86_64_link_hash_table_free (bfd *obfd)
1027 {
1028 struct elf_x86_64_link_hash_table *htab
1029 = (struct elf_x86_64_link_hash_table *) obfd->link.hash;
1030
1031 if (htab->loc_hash_table)
1032 htab_delete (htab->loc_hash_table);
1033 if (htab->loc_hash_memory)
1034 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1035 _bfd_elf_link_hash_table_free (obfd);
1036 }
1037
1038 /* Create an X86-64 ELF linker hash table. */
1039
1040 static struct bfd_link_hash_table *
1041 elf_x86_64_link_hash_table_create (bfd *abfd)
1042 {
1043 struct elf_x86_64_link_hash_table *ret;
1044 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
1045
1046 ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt);
1047 if (ret == NULL)
1048 return NULL;
1049
1050 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1051 elf_x86_64_link_hash_newfunc,
1052 sizeof (struct elf_x86_64_link_hash_entry),
1053 X86_64_ELF_DATA))
1054 {
1055 free (ret);
1056 return NULL;
1057 }
1058
1059 if (ABI_64_P (abfd))
1060 {
1061 ret->r_info = elf64_r_info;
1062 ret->r_sym = elf64_r_sym;
1063 ret->pointer_r_type = R_X86_64_64;
1064 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
1065 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
1066 }
1067 else
1068 {
1069 ret->r_info = elf32_r_info;
1070 ret->r_sym = elf32_r_sym;
1071 ret->pointer_r_type = R_X86_64_32;
1072 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
1073 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
1074 }
1075
1076 ret->loc_hash_table = htab_try_create (1024,
1077 elf_x86_64_local_htab_hash,
1078 elf_x86_64_local_htab_eq,
1079 NULL);
1080 ret->loc_hash_memory = objalloc_create ();
1081 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1082 {
1083 elf_x86_64_link_hash_table_free (abfd);
1084 return NULL;
1085 }
1086 ret->elf.root.hash_table_free = elf_x86_64_link_hash_table_free;
1087
1088 return &ret->elf.root;
1089 }
1090
1091 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
1092 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
1093 hash table. */
1094
1095 static bfd_boolean
1096 elf_x86_64_create_dynamic_sections (bfd *dynobj,
1097 struct bfd_link_info *info)
1098 {
1099 struct elf_x86_64_link_hash_table *htab;
1100
1101 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1102 return FALSE;
1103
1104 htab = elf_x86_64_hash_table (info);
1105 if (htab == NULL)
1106 return FALSE;
1107
1108 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1109 if (!htab->sdynbss)
1110 abort ();
1111
1112 if (bfd_link_executable (info))
1113 {
1114 /* Always allow copy relocs for building executables. */
1115 asection *s = bfd_get_linker_section (dynobj, ".rela.bss");
1116 if (s == NULL)
1117 {
1118 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1119 s = bfd_make_section_anyway_with_flags (dynobj,
1120 ".rela.bss",
1121 (bed->dynamic_sec_flags
1122 | SEC_READONLY));
1123 if (s == NULL
1124 || ! bfd_set_section_alignment (dynobj, s,
1125 bed->s->log_file_align))
1126 return FALSE;
1127 }
1128 htab->srelbss = s;
1129 }
1130
1131 if (!info->no_ld_generated_unwind_info
1132 && htab->plt_eh_frame == NULL
1133 && htab->elf.splt != NULL)
1134 {
1135 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1136 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1137 | SEC_LINKER_CREATED);
1138 htab->plt_eh_frame
1139 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1140 if (htab->plt_eh_frame == NULL
1141 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
1142 return FALSE;
1143 }
1144 return TRUE;
1145 }
1146
1147 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1148
1149 static void
1150 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
1151 struct elf_link_hash_entry *dir,
1152 struct elf_link_hash_entry *ind)
1153 {
1154 struct elf_x86_64_link_hash_entry *edir, *eind;
1155
1156 edir = (struct elf_x86_64_link_hash_entry *) dir;
1157 eind = (struct elf_x86_64_link_hash_entry *) ind;
1158
1159 if (!edir->has_bnd_reloc)
1160 edir->has_bnd_reloc = eind->has_bnd_reloc;
1161
1162 if (!edir->has_got_reloc)
1163 edir->has_got_reloc = eind->has_got_reloc;
1164
1165 if (!edir->has_non_got_reloc)
1166 edir->has_non_got_reloc = eind->has_non_got_reloc;
1167
1168 if (eind->dyn_relocs != NULL)
1169 {
1170 if (edir->dyn_relocs != NULL)
1171 {
1172 struct elf_dyn_relocs **pp;
1173 struct elf_dyn_relocs *p;
1174
1175 /* Add reloc counts against the indirect sym to the direct sym
1176 list. Merge any entries against the same section. */
1177 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1178 {
1179 struct elf_dyn_relocs *q;
1180
1181 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1182 if (q->sec == p->sec)
1183 {
1184 q->pc_count += p->pc_count;
1185 q->count += p->count;
1186 *pp = p->next;
1187 break;
1188 }
1189 if (q == NULL)
1190 pp = &p->next;
1191 }
1192 *pp = edir->dyn_relocs;
1193 }
1194
1195 edir->dyn_relocs = eind->dyn_relocs;
1196 eind->dyn_relocs = NULL;
1197 }
1198
1199 if (ind->root.type == bfd_link_hash_indirect
1200 && dir->got.refcount <= 0)
1201 {
1202 edir->tls_type = eind->tls_type;
1203 eind->tls_type = GOT_UNKNOWN;
1204 }
1205
1206 if (ELIMINATE_COPY_RELOCS
1207 && ind->root.type != bfd_link_hash_indirect
1208 && dir->dynamic_adjusted)
1209 {
1210 /* If called to transfer flags for a weakdef during processing
1211 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1212 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1213 dir->ref_dynamic |= ind->ref_dynamic;
1214 dir->ref_regular |= ind->ref_regular;
1215 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1216 dir->needs_plt |= ind->needs_plt;
1217 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1218 }
1219 else
1220 {
1221 if (eind->func_pointer_refcount > 0)
1222 {
1223 edir->func_pointer_refcount += eind->func_pointer_refcount;
1224 eind->func_pointer_refcount = 0;
1225 }
1226
1227 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1228 }
1229 }
1230
1231 static bfd_boolean
1232 elf64_x86_64_elf_object_p (bfd *abfd)
1233 {
1234 /* Set the right machine number for an x86-64 elf64 file. */
1235 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1236 return TRUE;
1237 }
1238
1239 static bfd_boolean
1240 elf32_x86_64_elf_object_p (bfd *abfd)
1241 {
1242 /* Set the right machine number for an x86-64 elf32 file. */
1243 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1244 return TRUE;
1245 }
1246
1247 /* Return TRUE if the TLS access code sequence support transition
1248 from R_TYPE. */
1249
1250 static bfd_boolean
1251 elf_x86_64_check_tls_transition (bfd *abfd,
1252 struct bfd_link_info *info,
1253 asection *sec,
1254 bfd_byte *contents,
1255 Elf_Internal_Shdr *symtab_hdr,
1256 struct elf_link_hash_entry **sym_hashes,
1257 unsigned int r_type,
1258 const Elf_Internal_Rela *rel,
1259 const Elf_Internal_Rela *relend)
1260 {
1261 unsigned int val;
1262 unsigned long r_symndx;
1263 bfd_boolean largepic = FALSE;
1264 struct elf_link_hash_entry *h;
1265 bfd_vma offset;
1266 struct elf_x86_64_link_hash_table *htab;
1267
1268 /* Get the section contents. */
1269 if (contents == NULL)
1270 {
1271 if (elf_section_data (sec)->this_hdr.contents != NULL)
1272 contents = elf_section_data (sec)->this_hdr.contents;
1273 else
1274 {
1275 /* FIXME: How to better handle error condition? */
1276 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1277 return FALSE;
1278
1279 /* Cache the section contents for elf_link_input_bfd. */
1280 elf_section_data (sec)->this_hdr.contents = contents;
1281 }
1282 }
1283
1284 htab = elf_x86_64_hash_table (info);
1285 offset = rel->r_offset;
1286 switch (r_type)
1287 {
1288 case R_X86_64_TLSGD:
1289 case R_X86_64_TLSLD:
1290 if ((rel + 1) >= relend)
1291 return FALSE;
1292
1293 if (r_type == R_X86_64_TLSGD)
1294 {
1295 /* Check transition from GD access model. For 64bit, only
1296 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1297 .word 0x6666; rex64; call __tls_get_addr
1298 can transit to different access model. For 32bit, only
1299 leaq foo@tlsgd(%rip), %rdi
1300 .word 0x6666; rex64; call __tls_get_addr
1301 can transit to different access model. For largepic
1302 we also support:
1303 leaq foo@tlsgd(%rip), %rdi
1304 movabsq $__tls_get_addr@pltoff, %rax
1305 addq $rbx, %rax
1306 call *%rax. */
1307
1308 static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 };
1309 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1310
1311 if ((offset + 12) > sec->size)
1312 return FALSE;
1313
1314 if (memcmp (contents + offset + 4, call, 4) != 0)
1315 {
1316 if (!ABI_64_P (abfd)
1317 || (offset + 19) > sec->size
1318 || offset < 3
1319 || memcmp (contents + offset - 3, leaq + 1, 3) != 0
1320 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1321 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1322 != 0)
1323 return FALSE;
1324 largepic = TRUE;
1325 }
1326 else if (ABI_64_P (abfd))
1327 {
1328 if (offset < 4
1329 || memcmp (contents + offset - 4, leaq, 4) != 0)
1330 return FALSE;
1331 }
1332 else
1333 {
1334 if (offset < 3
1335 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1336 return FALSE;
1337 }
1338 }
1339 else
1340 {
1341 /* Check transition from LD access model. Only
1342 leaq foo@tlsld(%rip), %rdi;
1343 call __tls_get_addr
1344 can transit to different access model. For largepic
1345 we also support:
1346 leaq foo@tlsld(%rip), %rdi
1347 movabsq $__tls_get_addr@pltoff, %rax
1348 addq $rbx, %rax
1349 call *%rax. */
1350
1351 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1352
1353 if (offset < 3 || (offset + 9) > sec->size)
1354 return FALSE;
1355
1356 if (memcmp (contents + offset - 3, lea, 3) != 0)
1357 return FALSE;
1358
1359 if (0xe8 != *(contents + offset + 4))
1360 {
1361 if (!ABI_64_P (abfd)
1362 || (offset + 19) > sec->size
1363 || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
1364 || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
1365 != 0)
1366 return FALSE;
1367 largepic = TRUE;
1368 }
1369 }
1370
1371 r_symndx = htab->r_sym (rel[1].r_info);
1372 if (r_symndx < symtab_hdr->sh_info)
1373 return FALSE;
1374
1375 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1376 /* Use strncmp to check __tls_get_addr since __tls_get_addr
1377 may be versioned. */
1378 return (h != NULL
1379 && h->root.root.string != NULL
1380 && (largepic
1381 ? ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64
1382 : (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1383 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32))
1384 && (strncmp (h->root.root.string,
1385 "__tls_get_addr", 14) == 0));
1386
1387 case R_X86_64_GOTTPOFF:
1388 /* Check transition from IE access model:
1389 mov foo@gottpoff(%rip), %reg
1390 add foo@gottpoff(%rip), %reg
1391 */
1392
1393 /* Check REX prefix first. */
1394 if (offset >= 3 && (offset + 4) <= sec->size)
1395 {
1396 val = bfd_get_8 (abfd, contents + offset - 3);
1397 if (val != 0x48 && val != 0x4c)
1398 {
1399 /* X32 may have 0x44 REX prefix or no REX prefix. */
1400 if (ABI_64_P (abfd))
1401 return FALSE;
1402 }
1403 }
1404 else
1405 {
1406 /* X32 may not have any REX prefix. */
1407 if (ABI_64_P (abfd))
1408 return FALSE;
1409 if (offset < 2 || (offset + 3) > sec->size)
1410 return FALSE;
1411 }
1412
1413 val = bfd_get_8 (abfd, contents + offset - 2);
1414 if (val != 0x8b && val != 0x03)
1415 return FALSE;
1416
1417 val = bfd_get_8 (abfd, contents + offset - 1);
1418 return (val & 0xc7) == 5;
1419
1420 case R_X86_64_GOTPC32_TLSDESC:
1421 /* Check transition from GDesc access model:
1422 leaq x@tlsdesc(%rip), %rax
1423
1424 Make sure it's a leaq adding rip to a 32-bit offset
1425 into any register, although it's probably almost always
1426 going to be rax. */
1427
1428 if (offset < 3 || (offset + 4) > sec->size)
1429 return FALSE;
1430
1431 val = bfd_get_8 (abfd, contents + offset - 3);
1432 if ((val & 0xfb) != 0x48)
1433 return FALSE;
1434
1435 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1436 return FALSE;
1437
1438 val = bfd_get_8 (abfd, contents + offset - 1);
1439 return (val & 0xc7) == 0x05;
1440
1441 case R_X86_64_TLSDESC_CALL:
1442 /* Check transition from GDesc access model:
1443 call *x@tlsdesc(%rax)
1444 */
1445 if (offset + 2 <= sec->size)
1446 {
1447 /* Make sure that it's a call *x@tlsdesc(%rax). */
1448 static const unsigned char call[] = { 0xff, 0x10 };
1449 return memcmp (contents + offset, call, 2) == 0;
1450 }
1451
1452 return FALSE;
1453
1454 default:
1455 abort ();
1456 }
1457 }
1458
1459 /* Return TRUE if the TLS access transition is OK or no transition
1460 will be performed. Update R_TYPE if there is a transition. */
1461
1462 static bfd_boolean
1463 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1464 asection *sec, bfd_byte *contents,
1465 Elf_Internal_Shdr *symtab_hdr,
1466 struct elf_link_hash_entry **sym_hashes,
1467 unsigned int *r_type, int tls_type,
1468 const Elf_Internal_Rela *rel,
1469 const Elf_Internal_Rela *relend,
1470 struct elf_link_hash_entry *h,
1471 unsigned long r_symndx)
1472 {
1473 unsigned int from_type = *r_type;
1474 unsigned int to_type = from_type;
1475 bfd_boolean check = TRUE;
1476
1477 /* Skip TLS transition for functions. */
1478 if (h != NULL
1479 && (h->type == STT_FUNC
1480 || h->type == STT_GNU_IFUNC))
1481 return TRUE;
1482
1483 switch (from_type)
1484 {
1485 case R_X86_64_TLSGD:
1486 case R_X86_64_GOTPC32_TLSDESC:
1487 case R_X86_64_TLSDESC_CALL:
1488 case R_X86_64_GOTTPOFF:
1489 if (bfd_link_executable (info))
1490 {
1491 if (h == NULL)
1492 to_type = R_X86_64_TPOFF32;
1493 else
1494 to_type = R_X86_64_GOTTPOFF;
1495 }
1496
1497 /* When we are called from elf_x86_64_relocate_section,
1498 CONTENTS isn't NULL and there may be additional transitions
1499 based on TLS_TYPE. */
1500 if (contents != NULL)
1501 {
1502 unsigned int new_to_type = to_type;
1503
1504 if (bfd_link_executable (info)
1505 && h != NULL
1506 && h->dynindx == -1
1507 && tls_type == GOT_TLS_IE)
1508 new_to_type = R_X86_64_TPOFF32;
1509
1510 if (to_type == R_X86_64_TLSGD
1511 || to_type == R_X86_64_GOTPC32_TLSDESC
1512 || to_type == R_X86_64_TLSDESC_CALL)
1513 {
1514 if (tls_type == GOT_TLS_IE)
1515 new_to_type = R_X86_64_GOTTPOFF;
1516 }
1517
1518 /* We checked the transition before when we were called from
1519 elf_x86_64_check_relocs. We only want to check the new
1520 transition which hasn't been checked before. */
1521 check = new_to_type != to_type && from_type == to_type;
1522 to_type = new_to_type;
1523 }
1524
1525 break;
1526
1527 case R_X86_64_TLSLD:
1528 if (bfd_link_executable (info))
1529 to_type = R_X86_64_TPOFF32;
1530 break;
1531
1532 default:
1533 return TRUE;
1534 }
1535
1536 /* Return TRUE if there is no transition. */
1537 if (from_type == to_type)
1538 return TRUE;
1539
1540 /* Check if the transition can be performed. */
1541 if (check
1542 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1543 symtab_hdr, sym_hashes,
1544 from_type, rel, relend))
1545 {
1546 reloc_howto_type *from, *to;
1547 const char *name;
1548
1549 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1550 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1551
1552 if (h)
1553 name = h->root.root.string;
1554 else
1555 {
1556 struct elf_x86_64_link_hash_table *htab;
1557
1558 htab = elf_x86_64_hash_table (info);
1559 if (htab == NULL)
1560 name = "*unknown*";
1561 else
1562 {
1563 Elf_Internal_Sym *isym;
1564
1565 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1566 abfd, r_symndx);
1567 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1568 }
1569 }
1570
1571 (*_bfd_error_handler)
1572 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1573 "in section `%A' failed"),
1574 abfd, sec, from->name, to->name, name,
1575 (unsigned long) rel->r_offset);
1576 bfd_set_error (bfd_error_bad_value);
1577 return FALSE;
1578 }
1579
1580 *r_type = to_type;
1581 return TRUE;
1582 }
1583
1584 /* Rename some of the generic section flags to better document how they
1585 are used here. */
1586 #define need_convert_load sec_flg0
1587
1588 /* Look through the relocs for a section during the first phase, and
1589 calculate needed space in the global offset table, procedure
1590 linkage table, and dynamic reloc sections. */
1591
1592 static bfd_boolean
1593 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1594 asection *sec,
1595 const Elf_Internal_Rela *relocs)
1596 {
1597 struct elf_x86_64_link_hash_table *htab;
1598 Elf_Internal_Shdr *symtab_hdr;
1599 struct elf_link_hash_entry **sym_hashes;
1600 const Elf_Internal_Rela *rel;
1601 const Elf_Internal_Rela *rel_end;
1602 asection *sreloc;
1603 bfd_boolean use_plt_got;
1604
1605 if (bfd_link_relocatable (info))
1606 return TRUE;
1607
1608 BFD_ASSERT (is_x86_64_elf (abfd));
1609
1610 htab = elf_x86_64_hash_table (info);
1611 if (htab == NULL)
1612 return FALSE;
1613
1614 use_plt_got = get_elf_x86_64_backend_data (abfd) == &elf_x86_64_arch_bed;
1615
1616 symtab_hdr = &elf_symtab_hdr (abfd);
1617 sym_hashes = elf_sym_hashes (abfd);
1618
1619 sreloc = NULL;
1620
1621 rel_end = relocs + sec->reloc_count;
1622 for (rel = relocs; rel < rel_end; rel++)
1623 {
1624 unsigned int r_type;
1625 unsigned long r_symndx;
1626 struct elf_link_hash_entry *h;
1627 struct elf_x86_64_link_hash_entry *eh;
1628 Elf_Internal_Sym *isym;
1629 const char *name;
1630 bfd_boolean size_reloc;
1631
1632 r_symndx = htab->r_sym (rel->r_info);
1633 r_type = ELF32_R_TYPE (rel->r_info);
1634
1635 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1636 {
1637 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1638 abfd, r_symndx);
1639 return FALSE;
1640 }
1641
1642 if (r_symndx < symtab_hdr->sh_info)
1643 {
1644 /* A local symbol. */
1645 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1646 abfd, r_symndx);
1647 if (isym == NULL)
1648 return FALSE;
1649
1650 /* Check relocation against local STT_GNU_IFUNC symbol. */
1651 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1652 {
1653 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1654 TRUE);
1655 if (h == NULL)
1656 return FALSE;
1657
1658 /* Fake a STT_GNU_IFUNC symbol. */
1659 h->type = STT_GNU_IFUNC;
1660 h->def_regular = 1;
1661 h->ref_regular = 1;
1662 h->forced_local = 1;
1663 h->root.type = bfd_link_hash_defined;
1664 }
1665 else
1666 h = NULL;
1667 }
1668 else
1669 {
1670 isym = NULL;
1671 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1672 while (h->root.type == bfd_link_hash_indirect
1673 || h->root.type == bfd_link_hash_warning)
1674 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1675 }
1676
1677 /* Check invalid x32 relocations. */
1678 if (!ABI_64_P (abfd))
1679 switch (r_type)
1680 {
1681 default:
1682 break;
1683
1684 case R_X86_64_DTPOFF64:
1685 case R_X86_64_TPOFF64:
1686 case R_X86_64_PC64:
1687 case R_X86_64_GOTOFF64:
1688 case R_X86_64_GOT64:
1689 case R_X86_64_GOTPCREL64:
1690 case R_X86_64_GOTPC64:
1691 case R_X86_64_GOTPLT64:
1692 case R_X86_64_PLTOFF64:
1693 {
1694 if (h)
1695 name = h->root.root.string;
1696 else
1697 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1698 NULL);
1699 (*_bfd_error_handler)
1700 (_("%B: relocation %s against symbol `%s' isn't "
1701 "supported in x32 mode"), abfd,
1702 x86_64_elf_howto_table[r_type].name, name);
1703 bfd_set_error (bfd_error_bad_value);
1704 return FALSE;
1705 }
1706 break;
1707 }
1708
1709 if (h != NULL)
1710 {
1711 /* Create the ifunc sections for static executables. If we
1712 never see an indirect function symbol nor we are building
1713 a static executable, those sections will be empty and
1714 won't appear in output. */
1715 switch (r_type)
1716 {
1717 default:
1718 break;
1719
1720 case R_X86_64_PC32_BND:
1721 case R_X86_64_PLT32_BND:
1722 case R_X86_64_PC32:
1723 case R_X86_64_PLT32:
1724 case R_X86_64_32:
1725 case R_X86_64_64:
1726 /* MPX PLT is supported only if elf_x86_64_arch_bed
1727 is used in 64-bit mode. */
1728 if (ABI_64_P (abfd)
1729 && info->bndplt
1730 && (get_elf_x86_64_backend_data (abfd)
1731 == &elf_x86_64_arch_bed))
1732 {
1733 elf_x86_64_hash_entry (h)->has_bnd_reloc = 1;
1734
1735 /* Create the second PLT for Intel MPX support. */
1736 if (htab->plt_bnd == NULL)
1737 {
1738 unsigned int plt_bnd_align;
1739 const struct elf_backend_data *bed;
1740
1741 bed = get_elf_backend_data (info->output_bfd);
1742 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry) == 8
1743 && (sizeof (elf_x86_64_bnd_plt2_entry)
1744 == sizeof (elf_x86_64_legacy_plt2_entry)));
1745 plt_bnd_align = 3;
1746
1747 if (htab->elf.dynobj == NULL)
1748 htab->elf.dynobj = abfd;
1749 htab->plt_bnd
1750 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1751 ".plt.bnd",
1752 (bed->dynamic_sec_flags
1753 | SEC_ALLOC
1754 | SEC_CODE
1755 | SEC_LOAD
1756 | SEC_READONLY));
1757 if (htab->plt_bnd == NULL
1758 || !bfd_set_section_alignment (htab->elf.dynobj,
1759 htab->plt_bnd,
1760 plt_bnd_align))
1761 return FALSE;
1762 }
1763 }
1764
1765 case R_X86_64_32S:
1766 case R_X86_64_PC64:
1767 case R_X86_64_GOTPCREL:
1768 case R_X86_64_GOTPCRELX:
1769 case R_X86_64_REX_GOTPCRELX:
1770 case R_X86_64_GOTPCREL64:
1771 if (htab->elf.dynobj == NULL)
1772 htab->elf.dynobj = abfd;
1773 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1774 return FALSE;
1775 break;
1776 }
1777
1778 /* It is referenced by a non-shared object. */
1779 h->ref_regular = 1;
1780 h->root.non_ir_ref = 1;
1781
1782 if (h->type == STT_GNU_IFUNC)
1783 elf_tdata (info->output_bfd)->has_gnu_symbols
1784 |= elf_gnu_symbol_ifunc;
1785 }
1786
1787 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1788 symtab_hdr, sym_hashes,
1789 &r_type, GOT_UNKNOWN,
1790 rel, rel_end, h, r_symndx))
1791 return FALSE;
1792
1793 eh = (struct elf_x86_64_link_hash_entry *) h;
1794 switch (r_type)
1795 {
1796 case R_X86_64_TLSLD:
1797 htab->tls_ld_got.refcount += 1;
1798 goto create_got;
1799
1800 case R_X86_64_TPOFF32:
1801 if (!bfd_link_executable (info) && ABI_64_P (abfd))
1802 {
1803 if (h)
1804 name = h->root.root.string;
1805 else
1806 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1807 NULL);
1808 (*_bfd_error_handler)
1809 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1810 abfd,
1811 x86_64_elf_howto_table[r_type].name, name);
1812 bfd_set_error (bfd_error_bad_value);
1813 return FALSE;
1814 }
1815 if (eh != NULL)
1816 eh->has_got_reloc = 1;
1817 break;
1818
1819 case R_X86_64_GOTTPOFF:
1820 if (!bfd_link_executable (info))
1821 info->flags |= DF_STATIC_TLS;
1822 /* Fall through */
1823
1824 case R_X86_64_GOT32:
1825 case R_X86_64_GOTPCREL:
1826 case R_X86_64_GOTPCRELX:
1827 case R_X86_64_REX_GOTPCRELX:
1828 case R_X86_64_TLSGD:
1829 case R_X86_64_GOT64:
1830 case R_X86_64_GOTPCREL64:
1831 case R_X86_64_GOTPLT64:
1832 case R_X86_64_GOTPC32_TLSDESC:
1833 case R_X86_64_TLSDESC_CALL:
1834 /* This symbol requires a global offset table entry. */
1835 {
1836 int tls_type, old_tls_type;
1837
1838 switch (r_type)
1839 {
1840 default: tls_type = GOT_NORMAL; break;
1841 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1842 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1843 case R_X86_64_GOTPC32_TLSDESC:
1844 case R_X86_64_TLSDESC_CALL:
1845 tls_type = GOT_TLS_GDESC; break;
1846 }
1847
1848 if (h != NULL)
1849 {
1850 h->got.refcount += 1;
1851 old_tls_type = eh->tls_type;
1852 }
1853 else
1854 {
1855 bfd_signed_vma *local_got_refcounts;
1856
1857 /* This is a global offset table entry for a local symbol. */
1858 local_got_refcounts = elf_local_got_refcounts (abfd);
1859 if (local_got_refcounts == NULL)
1860 {
1861 bfd_size_type size;
1862
1863 size = symtab_hdr->sh_info;
1864 size *= sizeof (bfd_signed_vma)
1865 + sizeof (bfd_vma) + sizeof (char);
1866 local_got_refcounts = ((bfd_signed_vma *)
1867 bfd_zalloc (abfd, size));
1868 if (local_got_refcounts == NULL)
1869 return FALSE;
1870 elf_local_got_refcounts (abfd) = local_got_refcounts;
1871 elf_x86_64_local_tlsdesc_gotent (abfd)
1872 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1873 elf_x86_64_local_got_tls_type (abfd)
1874 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1875 }
1876 local_got_refcounts[r_symndx] += 1;
1877 old_tls_type
1878 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1879 }
1880
1881 /* If a TLS symbol is accessed using IE at least once,
1882 there is no point to use dynamic model for it. */
1883 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1884 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1885 || tls_type != GOT_TLS_IE))
1886 {
1887 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1888 tls_type = old_tls_type;
1889 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1890 && GOT_TLS_GD_ANY_P (tls_type))
1891 tls_type |= old_tls_type;
1892 else
1893 {
1894 if (h)
1895 name = h->root.root.string;
1896 else
1897 name = bfd_elf_sym_name (abfd, symtab_hdr,
1898 isym, NULL);
1899 (*_bfd_error_handler)
1900 (_("%B: '%s' accessed both as normal and thread local symbol"),
1901 abfd, name);
1902 bfd_set_error (bfd_error_bad_value);
1903 return FALSE;
1904 }
1905 }
1906
1907 if (old_tls_type != tls_type)
1908 {
1909 if (eh != NULL)
1910 eh->tls_type = tls_type;
1911 else
1912 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1913 }
1914 }
1915 /* Fall through */
1916
1917 case R_X86_64_GOTOFF64:
1918 case R_X86_64_GOTPC32:
1919 case R_X86_64_GOTPC64:
1920 create_got:
1921 if (eh != NULL)
1922 eh->has_got_reloc = 1;
1923 if (htab->elf.sgot == NULL)
1924 {
1925 if (htab->elf.dynobj == NULL)
1926 htab->elf.dynobj = abfd;
1927 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1928 info))
1929 return FALSE;
1930 }
1931 break;
1932
1933 case R_X86_64_PLT32:
1934 case R_X86_64_PLT32_BND:
1935 /* This symbol requires a procedure linkage table entry. We
1936 actually build the entry in adjust_dynamic_symbol,
1937 because this might be a case of linking PIC code which is
1938 never referenced by a dynamic object, in which case we
1939 don't need to generate a procedure linkage table entry
1940 after all. */
1941
1942 /* If this is a local symbol, we resolve it directly without
1943 creating a procedure linkage table entry. */
1944 if (h == NULL)
1945 continue;
1946
1947 eh->has_got_reloc = 1;
1948 h->needs_plt = 1;
1949 h->plt.refcount += 1;
1950 break;
1951
1952 case R_X86_64_PLTOFF64:
1953 /* This tries to form the 'address' of a function relative
1954 to GOT. For global symbols we need a PLT entry. */
1955 if (h != NULL)
1956 {
1957 h->needs_plt = 1;
1958 h->plt.refcount += 1;
1959 }
1960 goto create_got;
1961
1962 case R_X86_64_SIZE32:
1963 case R_X86_64_SIZE64:
1964 size_reloc = TRUE;
1965 goto do_size;
1966
1967 case R_X86_64_32:
1968 if (!ABI_64_P (abfd))
1969 goto pointer;
1970 case R_X86_64_8:
1971 case R_X86_64_16:
1972 case R_X86_64_32S:
1973 /* Let's help debug shared library creation. These relocs
1974 cannot be used in shared libs. Don't error out for
1975 sections we don't care about, such as debug sections or
1976 non-constant sections. */
1977 if (bfd_link_pic (info)
1978 && (sec->flags & SEC_ALLOC) != 0
1979 && (sec->flags & SEC_READONLY) != 0)
1980 {
1981 if (h)
1982 name = h->root.root.string;
1983 else
1984 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1985 (*_bfd_error_handler)
1986 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1987 abfd, x86_64_elf_howto_table[r_type].name, name);
1988 bfd_set_error (bfd_error_bad_value);
1989 return FALSE;
1990 }
1991 /* Fall through. */
1992
1993 case R_X86_64_PC8:
1994 case R_X86_64_PC16:
1995 case R_X86_64_PC32:
1996 case R_X86_64_PC32_BND:
1997 case R_X86_64_PC64:
1998 case R_X86_64_64:
1999 pointer:
2000 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2001 eh->has_non_got_reloc = 1;
2002 if (h != NULL && bfd_link_executable (info))
2003 {
2004 /* If this reloc is in a read-only section, we might
2005 need a copy reloc. We can't check reliably at this
2006 stage whether the section is read-only, as input
2007 sections have not yet been mapped to output sections.
2008 Tentatively set the flag for now, and correct in
2009 adjust_dynamic_symbol. */
2010 h->non_got_ref = 1;
2011
2012 /* We may need a .plt entry if the function this reloc
2013 refers to is in a shared lib. */
2014 h->plt.refcount += 1;
2015 if (r_type == R_X86_64_PC32)
2016 {
2017 /* Since something like ".long foo - ." may be used
2018 as pointer, make sure that PLT is used if foo is
2019 a function defined in a shared library. */
2020 if ((sec->flags & SEC_CODE) == 0)
2021 h->pointer_equality_needed = 1;
2022 }
2023 else if (r_type != R_X86_64_PC32_BND
2024 && r_type != R_X86_64_PC64)
2025 {
2026 h->pointer_equality_needed = 1;
2027 /* At run-time, R_X86_64_64 can be resolved for both
2028 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2029 can only be resolved for x32. */
2030 if ((sec->flags & SEC_READONLY) == 0
2031 && (r_type == R_X86_64_64
2032 || (!ABI_64_P (abfd)
2033 && (r_type == R_X86_64_32
2034 || r_type == R_X86_64_32S))))
2035 eh->func_pointer_refcount += 1;
2036 }
2037 }
2038
2039 size_reloc = FALSE;
2040 do_size:
2041 /* If we are creating a shared library, and this is a reloc
2042 against a global symbol, or a non PC relative reloc
2043 against a local symbol, then we need to copy the reloc
2044 into the shared library. However, if we are linking with
2045 -Bsymbolic, we do not need to copy a reloc against a
2046 global symbol which is defined in an object we are
2047 including in the link (i.e., DEF_REGULAR is set). At
2048 this point we have not seen all the input files, so it is
2049 possible that DEF_REGULAR is not set now but will be set
2050 later (it is never cleared). In case of a weak definition,
2051 DEF_REGULAR may be cleared later by a strong definition in
2052 a shared library. We account for that possibility below by
2053 storing information in the relocs_copied field of the hash
2054 table entry. A similar situation occurs when creating
2055 shared libraries and symbol visibility changes render the
2056 symbol local.
2057
2058 If on the other hand, we are creating an executable, we
2059 may need to keep relocations for symbols satisfied by a
2060 dynamic library if we manage to avoid copy relocs for the
2061 symbol. */
2062 if ((bfd_link_pic (info)
2063 && (sec->flags & SEC_ALLOC) != 0
2064 && (! IS_X86_64_PCREL_TYPE (r_type)
2065 || (h != NULL
2066 && (! SYMBOLIC_BIND (info, h)
2067 || h->root.type == bfd_link_hash_defweak
2068 || !h->def_regular))))
2069 || (ELIMINATE_COPY_RELOCS
2070 && !bfd_link_pic (info)
2071 && (sec->flags & SEC_ALLOC) != 0
2072 && h != NULL
2073 && (h->root.type == bfd_link_hash_defweak
2074 || !h->def_regular)))
2075 {
2076 struct elf_dyn_relocs *p;
2077 struct elf_dyn_relocs **head;
2078
2079 /* We must copy these reloc types into the output file.
2080 Create a reloc section in dynobj and make room for
2081 this reloc. */
2082 if (sreloc == NULL)
2083 {
2084 if (htab->elf.dynobj == NULL)
2085 htab->elf.dynobj = abfd;
2086
2087 sreloc = _bfd_elf_make_dynamic_reloc_section
2088 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2089 abfd, /*rela?*/ TRUE);
2090
2091 if (sreloc == NULL)
2092 return FALSE;
2093 }
2094
2095 /* If this is a global symbol, we count the number of
2096 relocations we need for this symbol. */
2097 if (h != NULL)
2098 head = &eh->dyn_relocs;
2099 else
2100 {
2101 /* Track dynamic relocs needed for local syms too.
2102 We really need local syms available to do this
2103 easily. Oh well. */
2104 asection *s;
2105 void **vpp;
2106
2107 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2108 abfd, r_symndx);
2109 if (isym == NULL)
2110 return FALSE;
2111
2112 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2113 if (s == NULL)
2114 s = sec;
2115
2116 /* Beware of type punned pointers vs strict aliasing
2117 rules. */
2118 vpp = &(elf_section_data (s)->local_dynrel);
2119 head = (struct elf_dyn_relocs **)vpp;
2120 }
2121
2122 p = *head;
2123 if (p == NULL || p->sec != sec)
2124 {
2125 bfd_size_type amt = sizeof *p;
2126
2127 p = ((struct elf_dyn_relocs *)
2128 bfd_alloc (htab->elf.dynobj, amt));
2129 if (p == NULL)
2130 return FALSE;
2131 p->next = *head;
2132 *head = p;
2133 p->sec = sec;
2134 p->count = 0;
2135 p->pc_count = 0;
2136 }
2137
2138 p->count += 1;
2139 /* Count size relocation as PC-relative relocation. */
2140 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2141 p->pc_count += 1;
2142 }
2143 break;
2144
2145 /* This relocation describes the C++ object vtable hierarchy.
2146 Reconstruct it for later use during GC. */
2147 case R_X86_64_GNU_VTINHERIT:
2148 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2149 return FALSE;
2150 break;
2151
2152 /* This relocation describes which C++ vtable entries are actually
2153 used. Record for later use during GC. */
2154 case R_X86_64_GNU_VTENTRY:
2155 BFD_ASSERT (h != NULL);
2156 if (h != NULL
2157 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2158 return FALSE;
2159 break;
2160
2161 default:
2162 break;
2163 }
2164
2165 if (use_plt_got
2166 && h != NULL
2167 && h->plt.refcount > 0
2168 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2169 || h->got.refcount > 0)
2170 && htab->plt_got == NULL)
2171 {
2172 /* Create the GOT procedure linkage table. */
2173 unsigned int plt_got_align;
2174 const struct elf_backend_data *bed;
2175
2176 bed = get_elf_backend_data (info->output_bfd);
2177 BFD_ASSERT (sizeof (elf_x86_64_legacy_plt2_entry) == 8
2178 && (sizeof (elf_x86_64_bnd_plt2_entry)
2179 == sizeof (elf_x86_64_legacy_plt2_entry)));
2180 plt_got_align = 3;
2181
2182 if (htab->elf.dynobj == NULL)
2183 htab->elf.dynobj = abfd;
2184 htab->plt_got
2185 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2186 ".plt.got",
2187 (bed->dynamic_sec_flags
2188 | SEC_ALLOC
2189 | SEC_CODE
2190 | SEC_LOAD
2191 | SEC_READONLY));
2192 if (htab->plt_got == NULL
2193 || !bfd_set_section_alignment (htab->elf.dynobj,
2194 htab->plt_got,
2195 plt_got_align))
2196 return FALSE;
2197 }
2198
2199 if ((r_type == R_X86_64_GOTPCREL
2200 || r_type == R_X86_64_GOTPCRELX
2201 || r_type == R_X86_64_REX_GOTPCRELX)
2202 && (h == NULL || h->type != STT_GNU_IFUNC))
2203 sec->need_convert_load = 1;
2204 }
2205
2206 return TRUE;
2207 }
2208
2209 /* Return the section that should be marked against GC for a given
2210 relocation. */
2211
2212 static asection *
2213 elf_x86_64_gc_mark_hook (asection *sec,
2214 struct bfd_link_info *info,
2215 Elf_Internal_Rela *rel,
2216 struct elf_link_hash_entry *h,
2217 Elf_Internal_Sym *sym)
2218 {
2219 if (h != NULL)
2220 switch (ELF32_R_TYPE (rel->r_info))
2221 {
2222 case R_X86_64_GNU_VTINHERIT:
2223 case R_X86_64_GNU_VTENTRY:
2224 return NULL;
2225 }
2226
2227 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2228 }
2229
2230 /* Update the got entry reference counts for the section being removed. */
2231
2232 static bfd_boolean
2233 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
2234 asection *sec,
2235 const Elf_Internal_Rela *relocs)
2236 {
2237 struct elf_x86_64_link_hash_table *htab;
2238 Elf_Internal_Shdr *symtab_hdr;
2239 struct elf_link_hash_entry **sym_hashes;
2240 bfd_signed_vma *local_got_refcounts;
2241 const Elf_Internal_Rela *rel, *relend;
2242
2243 if (bfd_link_relocatable (info))
2244 return TRUE;
2245
2246 htab = elf_x86_64_hash_table (info);
2247 if (htab == NULL)
2248 return FALSE;
2249
2250 elf_section_data (sec)->local_dynrel = NULL;
2251
2252 symtab_hdr = &elf_symtab_hdr (abfd);
2253 sym_hashes = elf_sym_hashes (abfd);
2254 local_got_refcounts = elf_local_got_refcounts (abfd);
2255
2256 htab = elf_x86_64_hash_table (info);
2257 relend = relocs + sec->reloc_count;
2258 for (rel = relocs; rel < relend; rel++)
2259 {
2260 unsigned long r_symndx;
2261 unsigned int r_type;
2262 struct elf_link_hash_entry *h = NULL;
2263 bfd_boolean pointer_reloc;
2264
2265 r_symndx = htab->r_sym (rel->r_info);
2266 if (r_symndx >= symtab_hdr->sh_info)
2267 {
2268 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2269 while (h->root.type == bfd_link_hash_indirect
2270 || h->root.type == bfd_link_hash_warning)
2271 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2272 }
2273 else
2274 {
2275 /* A local symbol. */
2276 Elf_Internal_Sym *isym;
2277
2278 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2279 abfd, r_symndx);
2280
2281 /* Check relocation against local STT_GNU_IFUNC symbol. */
2282 if (isym != NULL
2283 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2284 {
2285 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
2286 if (h == NULL)
2287 abort ();
2288 }
2289 }
2290
2291 if (h)
2292 {
2293 struct elf_x86_64_link_hash_entry *eh;
2294 struct elf_dyn_relocs **pp;
2295 struct elf_dyn_relocs *p;
2296
2297 eh = (struct elf_x86_64_link_hash_entry *) h;
2298
2299 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2300 if (p->sec == sec)
2301 {
2302 /* Everything must go for SEC. */
2303 *pp = p->next;
2304 break;
2305 }
2306 }
2307
2308 r_type = ELF32_R_TYPE (rel->r_info);
2309 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
2310 symtab_hdr, sym_hashes,
2311 &r_type, GOT_UNKNOWN,
2312 rel, relend, h, r_symndx))
2313 return FALSE;
2314
2315 pointer_reloc = FALSE;
2316 switch (r_type)
2317 {
2318 case R_X86_64_TLSLD:
2319 if (htab->tls_ld_got.refcount > 0)
2320 htab->tls_ld_got.refcount -= 1;
2321 break;
2322
2323 case R_X86_64_TLSGD:
2324 case R_X86_64_GOTPC32_TLSDESC:
2325 case R_X86_64_TLSDESC_CALL:
2326 case R_X86_64_GOTTPOFF:
2327 case R_X86_64_GOT32:
2328 case R_X86_64_GOTPCREL:
2329 case R_X86_64_GOTPCRELX:
2330 case R_X86_64_REX_GOTPCRELX:
2331 case R_X86_64_GOT64:
2332 case R_X86_64_GOTPCREL64:
2333 case R_X86_64_GOTPLT64:
2334 if (h != NULL)
2335 {
2336 if (h->got.refcount > 0)
2337 h->got.refcount -= 1;
2338 if (h->type == STT_GNU_IFUNC)
2339 {
2340 if (h->plt.refcount > 0)
2341 h->plt.refcount -= 1;
2342 }
2343 }
2344 else if (local_got_refcounts != NULL)
2345 {
2346 if (local_got_refcounts[r_symndx] > 0)
2347 local_got_refcounts[r_symndx] -= 1;
2348 }
2349 break;
2350
2351 case R_X86_64_32:
2352 case R_X86_64_32S:
2353 pointer_reloc = !ABI_64_P (abfd);
2354 goto pointer;
2355
2356 case R_X86_64_64:
2357 pointer_reloc = TRUE;
2358 case R_X86_64_8:
2359 case R_X86_64_16:
2360 case R_X86_64_PC8:
2361 case R_X86_64_PC16:
2362 case R_X86_64_PC32:
2363 case R_X86_64_PC32_BND:
2364 case R_X86_64_PC64:
2365 case R_X86_64_SIZE32:
2366 case R_X86_64_SIZE64:
2367 pointer:
2368 if (bfd_link_pic (info)
2369 && (h == NULL || h->type != STT_GNU_IFUNC))
2370 break;
2371 /* Fall thru */
2372
2373 case R_X86_64_PLT32:
2374 case R_X86_64_PLT32_BND:
2375 case R_X86_64_PLTOFF64:
2376 if (h != NULL)
2377 {
2378 if (h->plt.refcount > 0)
2379 h->plt.refcount -= 1;
2380 if (pointer_reloc && (sec->flags & SEC_READONLY) == 0)
2381 {
2382 struct elf_x86_64_link_hash_entry *eh
2383 = (struct elf_x86_64_link_hash_entry *) h;
2384 if (eh->func_pointer_refcount > 0)
2385 eh->func_pointer_refcount -= 1;
2386 }
2387 }
2388 break;
2389
2390 default:
2391 break;
2392 }
2393 }
2394
2395 return TRUE;
2396 }
2397
2398 /* Remove undefined weak symbol from the dynamic symbol table if it
2399 is resolved to 0. */
2400
2401 static bfd_boolean
2402 elf_x86_64_fixup_symbol (struct bfd_link_info *info,
2403 struct elf_link_hash_entry *h)
2404 {
2405 if (h->dynindx != -1
2406 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2407 elf_x86_64_hash_entry (h)))
2408 {
2409 h->dynindx = -1;
2410 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2411 h->dynstr_index);
2412 }
2413 return TRUE;
2414 }
2415
2416 /* Adjust a symbol defined by a dynamic object and referenced by a
2417 regular object. The current definition is in some section of the
2418 dynamic object, but we're not including those sections. We have to
2419 change the definition to something the rest of the link can
2420 understand. */
2421
2422 static bfd_boolean
2423 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2424 struct elf_link_hash_entry *h)
2425 {
2426 struct elf_x86_64_link_hash_table *htab;
2427 asection *s;
2428 struct elf_x86_64_link_hash_entry *eh;
2429 struct elf_dyn_relocs *p;
2430
2431 /* STT_GNU_IFUNC symbol must go through PLT. */
2432 if (h->type == STT_GNU_IFUNC)
2433 {
2434 /* All local STT_GNU_IFUNC references must be treate as local
2435 calls via local PLT. */
2436 if (h->ref_regular
2437 && SYMBOL_CALLS_LOCAL (info, h))
2438 {
2439 bfd_size_type pc_count = 0, count = 0;
2440 struct elf_dyn_relocs **pp;
2441
2442 eh = (struct elf_x86_64_link_hash_entry *) h;
2443 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2444 {
2445 pc_count += p->pc_count;
2446 p->count -= p->pc_count;
2447 p->pc_count = 0;
2448 count += p->count;
2449 if (p->count == 0)
2450 *pp = p->next;
2451 else
2452 pp = &p->next;
2453 }
2454
2455 if (pc_count || count)
2456 {
2457 h->needs_plt = 1;
2458 h->non_got_ref = 1;
2459 if (h->plt.refcount <= 0)
2460 h->plt.refcount = 1;
2461 else
2462 h->plt.refcount += 1;
2463 }
2464 }
2465
2466 if (h->plt.refcount <= 0)
2467 {
2468 h->plt.offset = (bfd_vma) -1;
2469 h->needs_plt = 0;
2470 }
2471 return TRUE;
2472 }
2473
2474 /* If this is a function, put it in the procedure linkage table. We
2475 will fill in the contents of the procedure linkage table later,
2476 when we know the address of the .got section. */
2477 if (h->type == STT_FUNC
2478 || h->needs_plt)
2479 {
2480 if (h->plt.refcount <= 0
2481 || SYMBOL_CALLS_LOCAL (info, h)
2482 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2483 && h->root.type == bfd_link_hash_undefweak))
2484 {
2485 /* This case can occur if we saw a PLT32 reloc in an input
2486 file, but the symbol was never referred to by a dynamic
2487 object, or if all references were garbage collected. In
2488 such a case, we don't actually need to build a procedure
2489 linkage table, and we can just do a PC32 reloc instead. */
2490 h->plt.offset = (bfd_vma) -1;
2491 h->needs_plt = 0;
2492 }
2493
2494 return TRUE;
2495 }
2496 else
2497 /* It's possible that we incorrectly decided a .plt reloc was
2498 needed for an R_X86_64_PC32 reloc to a non-function sym in
2499 check_relocs. We can't decide accurately between function and
2500 non-function syms in check-relocs; Objects loaded later in
2501 the link may change h->type. So fix it now. */
2502 h->plt.offset = (bfd_vma) -1;
2503
2504 /* If this is a weak symbol, and there is a real definition, the
2505 processor independent code will have arranged for us to see the
2506 real definition first, and we can just use the same value. */
2507 if (h->u.weakdef != NULL)
2508 {
2509 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2510 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2511 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2512 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2513 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2514 {
2515 eh = (struct elf_x86_64_link_hash_entry *) h;
2516 h->non_got_ref = h->u.weakdef->non_got_ref;
2517 eh->needs_copy = h->u.weakdef->needs_copy;
2518 }
2519 return TRUE;
2520 }
2521
2522 /* This is a reference to a symbol defined by a dynamic object which
2523 is not a function. */
2524
2525 /* If we are creating a shared library, we must presume that the
2526 only references to the symbol are via the global offset table.
2527 For such cases we need not do anything here; the relocations will
2528 be handled correctly by relocate_section. */
2529 if (!bfd_link_executable (info))
2530 return TRUE;
2531
2532 /* If there are no references to this symbol that do not use the
2533 GOT, we don't need to generate a copy reloc. */
2534 if (!h->non_got_ref)
2535 return TRUE;
2536
2537 /* If -z nocopyreloc was given, we won't generate them either. */
2538 if (info->nocopyreloc)
2539 {
2540 h->non_got_ref = 0;
2541 return TRUE;
2542 }
2543
2544 if (ELIMINATE_COPY_RELOCS)
2545 {
2546 eh = (struct elf_x86_64_link_hash_entry *) h;
2547 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2548 {
2549 s = p->sec->output_section;
2550 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2551 break;
2552 }
2553
2554 /* If we didn't find any dynamic relocs in read-only sections, then
2555 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2556 if (p == NULL)
2557 {
2558 h->non_got_ref = 0;
2559 return TRUE;
2560 }
2561 }
2562
2563 /* We must allocate the symbol in our .dynbss section, which will
2564 become part of the .bss section of the executable. There will be
2565 an entry for this symbol in the .dynsym section. The dynamic
2566 object will contain position independent code, so all references
2567 from the dynamic object to this symbol will go through the global
2568 offset table. The dynamic linker will use the .dynsym entry to
2569 determine the address it must put in the global offset table, so
2570 both the dynamic object and the regular object will refer to the
2571 same memory location for the variable. */
2572
2573 htab = elf_x86_64_hash_table (info);
2574 if (htab == NULL)
2575 return FALSE;
2576
2577 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2578 to copy the initial value out of the dynamic object and into the
2579 runtime process image. */
2580 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2581 {
2582 const struct elf_backend_data *bed;
2583 bed = get_elf_backend_data (info->output_bfd);
2584 htab->srelbss->size += bed->s->sizeof_rela;
2585 h->needs_copy = 1;
2586 }
2587
2588 s = htab->sdynbss;
2589
2590 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2591 }
2592
2593 /* Allocate space in .plt, .got and associated reloc sections for
2594 dynamic relocs. */
2595
2596 static bfd_boolean
2597 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2598 {
2599 struct bfd_link_info *info;
2600 struct elf_x86_64_link_hash_table *htab;
2601 struct elf_x86_64_link_hash_entry *eh;
2602 struct elf_dyn_relocs *p;
2603 const struct elf_backend_data *bed;
2604 unsigned int plt_entry_size;
2605 bfd_boolean resolved_to_zero;
2606
2607 if (h->root.type == bfd_link_hash_indirect)
2608 return TRUE;
2609
2610 eh = (struct elf_x86_64_link_hash_entry *) h;
2611
2612 info = (struct bfd_link_info *) inf;
2613 htab = elf_x86_64_hash_table (info);
2614 if (htab == NULL)
2615 return FALSE;
2616 bed = get_elf_backend_data (info->output_bfd);
2617 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2618
2619 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
2620
2621 /* We can't use the GOT PLT if pointer equality is needed since
2622 finish_dynamic_symbol won't clear symbol value and the dynamic
2623 linker won't update the GOT slot. We will get into an infinite
2624 loop at run-time. */
2625 if (htab->plt_got != NULL
2626 && h->type != STT_GNU_IFUNC
2627 && !h->pointer_equality_needed
2628 && h->plt.refcount > 0
2629 && h->got.refcount > 0)
2630 {
2631 /* Don't use the regular PLT if there are both GOT and GOTPLT
2632 reloctions. */
2633 h->plt.offset = (bfd_vma) -1;
2634
2635 /* Use the GOT PLT. */
2636 eh->plt_got.refcount = 1;
2637 }
2638
2639 /* Clear the reference count of function pointer relocations if
2640 symbol isn't a normal function. */
2641 if (h->type != STT_FUNC)
2642 eh->func_pointer_refcount = 0;
2643
2644 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2645 here if it is defined and referenced in a non-shared object. */
2646 if (h->type == STT_GNU_IFUNC
2647 && h->def_regular)
2648 {
2649 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2650 &eh->dyn_relocs,
2651 plt_entry_size,
2652 plt_entry_size,
2653 GOT_ENTRY_SIZE))
2654 {
2655 asection *s = htab->plt_bnd;
2656 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
2657 {
2658 /* Use the .plt.bnd section if it is created. */
2659 eh->plt_bnd.offset = s->size;
2660
2661 /* Make room for this entry in the .plt.bnd section. */
2662 s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2663 }
2664
2665 return TRUE;
2666 }
2667 else
2668 return FALSE;
2669 }
2670 /* Don't create the PLT entry if there are only function pointer
2671 relocations which can be resolved at run-time. */
2672 else if (htab->elf.dynamic_sections_created
2673 && (h->plt.refcount > eh->func_pointer_refcount
2674 || eh->plt_got.refcount > 0))
2675 {
2676 bfd_boolean use_plt_got;
2677
2678 /* Clear the reference count of function pointer relocations
2679 if PLT is used. */
2680 eh->func_pointer_refcount = 0;
2681
2682 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2683 {
2684 /* Don't use the regular PLT for DF_BIND_NOW. */
2685 h->plt.offset = (bfd_vma) -1;
2686
2687 /* Use the GOT PLT. */
2688 h->got.refcount = 1;
2689 eh->plt_got.refcount = 1;
2690 }
2691
2692 use_plt_got = eh->plt_got.refcount > 0;
2693
2694 /* Make sure this symbol is output as a dynamic symbol.
2695 Undefined weak syms won't yet be marked as dynamic. */
2696 if (h->dynindx == -1
2697 && !h->forced_local
2698 && !resolved_to_zero)
2699 {
2700 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2701 return FALSE;
2702 }
2703
2704 if (bfd_link_pic (info)
2705 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2706 {
2707 asection *s = htab->elf.splt;
2708 asection *bnd_s = htab->plt_bnd;
2709 asection *got_s = htab->plt_got;
2710
2711 /* If this is the first .plt entry, make room for the special
2712 first entry. The .plt section is used by prelink to undo
2713 prelinking for dynamic relocations. */
2714 if (s->size == 0)
2715 s->size = plt_entry_size;
2716
2717 if (use_plt_got)
2718 eh->plt_got.offset = got_s->size;
2719 else
2720 {
2721 h->plt.offset = s->size;
2722 if (bnd_s)
2723 eh->plt_bnd.offset = bnd_s->size;
2724 }
2725
2726 /* If this symbol is not defined in a regular file, and we are
2727 not generating a shared library, then set the symbol to this
2728 location in the .plt. This is required to make function
2729 pointers compare as equal between the normal executable and
2730 the shared library. */
2731 if (! bfd_link_pic (info)
2732 && !h->def_regular)
2733 {
2734 if (use_plt_got)
2735 {
2736 /* We need to make a call to the entry of the GOT PLT
2737 instead of regular PLT entry. */
2738 h->root.u.def.section = got_s;
2739 h->root.u.def.value = eh->plt_got.offset;
2740 }
2741 else
2742 {
2743 if (bnd_s)
2744 {
2745 /* We need to make a call to the entry of the second
2746 PLT instead of regular PLT entry. */
2747 h->root.u.def.section = bnd_s;
2748 h->root.u.def.value = eh->plt_bnd.offset;
2749 }
2750 else
2751 {
2752 h->root.u.def.section = s;
2753 h->root.u.def.value = h->plt.offset;
2754 }
2755 }
2756 }
2757
2758 /* Make room for this entry. */
2759 if (use_plt_got)
2760 got_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2761 else
2762 {
2763 s->size += plt_entry_size;
2764 if (bnd_s)
2765 bnd_s->size += sizeof (elf_x86_64_legacy_plt2_entry);
2766
2767 /* We also need to make an entry in the .got.plt section,
2768 which will be placed in the .got section by the linker
2769 script. */
2770 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2771
2772 /* There should be no PLT relocation against resolved
2773 undefined weak symbol in executable. */
2774 if (!resolved_to_zero)
2775 {
2776 /* We also need to make an entry in the .rela.plt
2777 section. */
2778 htab->elf.srelplt->size += bed->s->sizeof_rela;
2779 htab->elf.srelplt->reloc_count++;
2780 }
2781 }
2782 }
2783 else
2784 {
2785 eh->plt_got.offset = (bfd_vma) -1;
2786 h->plt.offset = (bfd_vma) -1;
2787 h->needs_plt = 0;
2788 }
2789 }
2790 else
2791 {
2792 eh->plt_got.offset = (bfd_vma) -1;
2793 h->plt.offset = (bfd_vma) -1;
2794 h->needs_plt = 0;
2795 }
2796
2797 eh->tlsdesc_got = (bfd_vma) -1;
2798
2799 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2800 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2801 if (h->got.refcount > 0
2802 && bfd_link_executable (info)
2803 && h->dynindx == -1
2804 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2805 {
2806 h->got.offset = (bfd_vma) -1;
2807 }
2808 else if (h->got.refcount > 0)
2809 {
2810 asection *s;
2811 bfd_boolean dyn;
2812 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2813
2814 /* Make sure this symbol is output as a dynamic symbol.
2815 Undefined weak syms won't yet be marked as dynamic. */
2816 if (h->dynindx == -1
2817 && !h->forced_local
2818 && !resolved_to_zero)
2819 {
2820 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2821 return FALSE;
2822 }
2823
2824 if (GOT_TLS_GDESC_P (tls_type))
2825 {
2826 eh->tlsdesc_got = htab->elf.sgotplt->size
2827 - elf_x86_64_compute_jump_table_size (htab);
2828 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2829 h->got.offset = (bfd_vma) -2;
2830 }
2831 if (! GOT_TLS_GDESC_P (tls_type)
2832 || GOT_TLS_GD_P (tls_type))
2833 {
2834 s = htab->elf.sgot;
2835 h->got.offset = s->size;
2836 s->size += GOT_ENTRY_SIZE;
2837 if (GOT_TLS_GD_P (tls_type))
2838 s->size += GOT_ENTRY_SIZE;
2839 }
2840 dyn = htab->elf.dynamic_sections_created;
2841 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2842 and two if global. R_X86_64_GOTTPOFF needs one dynamic
2843 relocation. No dynamic relocation against resolved undefined
2844 weak symbol in executable. */
2845 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2846 || tls_type == GOT_TLS_IE)
2847 htab->elf.srelgot->size += bed->s->sizeof_rela;
2848 else if (GOT_TLS_GD_P (tls_type))
2849 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2850 else if (! GOT_TLS_GDESC_P (tls_type)
2851 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2852 && !resolved_to_zero)
2853 || h->root.type != bfd_link_hash_undefweak)
2854 && (bfd_link_pic (info)
2855 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2856 htab->elf.srelgot->size += bed->s->sizeof_rela;
2857 if (GOT_TLS_GDESC_P (tls_type))
2858 {
2859 htab->elf.srelplt->size += bed->s->sizeof_rela;
2860 htab->tlsdesc_plt = (bfd_vma) -1;
2861 }
2862 }
2863 else
2864 h->got.offset = (bfd_vma) -1;
2865
2866 if (eh->dyn_relocs == NULL)
2867 return TRUE;
2868
2869 /* In the shared -Bsymbolic case, discard space allocated for
2870 dynamic pc-relative relocs against symbols which turn out to be
2871 defined in regular objects. For the normal shared case, discard
2872 space for pc-relative relocs that have become local due to symbol
2873 visibility changes. */
2874
2875 if (bfd_link_pic (info))
2876 {
2877 /* Relocs that use pc_count are those that appear on a call
2878 insn, or certain REL relocs that can generated via assembly.
2879 We want calls to protected symbols to resolve directly to the
2880 function rather than going via the plt. If people want
2881 function pointer comparisons to work as expected then they
2882 should avoid writing weird assembly. */
2883 if (SYMBOL_CALLS_LOCAL (info, h))
2884 {
2885 struct elf_dyn_relocs **pp;
2886
2887 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2888 {
2889 p->count -= p->pc_count;
2890 p->pc_count = 0;
2891 if (p->count == 0)
2892 *pp = p->next;
2893 else
2894 pp = &p->next;
2895 }
2896 }
2897
2898 /* Also discard relocs on undefined weak syms with non-default
2899 visibility or in PIE. */
2900 if (eh->dyn_relocs != NULL)
2901 {
2902 if (h->root.type == bfd_link_hash_undefweak)
2903 {
2904 /* Undefined weak symbol is never bound locally in shared
2905 library. */
2906 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2907 || resolved_to_zero)
2908 eh->dyn_relocs = NULL;
2909 else if (h->dynindx == -1
2910 && ! h->forced_local
2911 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2912 return FALSE;
2913 }
2914 /* For PIE, discard space for pc-relative relocs against
2915 symbols which turn out to need copy relocs. */
2916 else if (bfd_link_executable (info)
2917 && (h->needs_copy || eh->needs_copy)
2918 && h->def_dynamic
2919 && !h->def_regular)
2920 {
2921 struct elf_dyn_relocs **pp;
2922
2923 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2924 {
2925 if (p->pc_count != 0)
2926 *pp = p->next;
2927 else
2928 pp = &p->next;
2929 }
2930 }
2931 }
2932 }
2933 else if (ELIMINATE_COPY_RELOCS)
2934 {
2935 /* For the non-shared case, discard space for relocs against
2936 symbols which turn out to need copy relocs or are not
2937 dynamic. Keep dynamic relocations for run-time function
2938 pointer initialization. */
2939
2940 if ((!h->non_got_ref
2941 || eh->func_pointer_refcount > 0
2942 || (h->root.type == bfd_link_hash_undefweak
2943 && !resolved_to_zero))
2944 && ((h->def_dynamic
2945 && !h->def_regular)
2946 || (htab->elf.dynamic_sections_created
2947 && (h->root.type == bfd_link_hash_undefweak
2948 || h->root.type == bfd_link_hash_undefined))))
2949 {
2950 /* Make sure this symbol is output as a dynamic symbol.
2951 Undefined weak syms won't yet be marked as dynamic. */
2952 if (h->dynindx == -1
2953 && ! h->forced_local
2954 && ! resolved_to_zero
2955 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2956 return FALSE;
2957
2958 /* If that succeeded, we know we'll be keeping all the
2959 relocs. */
2960 if (h->dynindx != -1)
2961 goto keep;
2962 }
2963
2964 eh->dyn_relocs = NULL;
2965 eh->func_pointer_refcount = 0;
2966
2967 keep: ;
2968 }
2969
2970 /* Finally, allocate space. */
2971 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2972 {
2973 asection * sreloc;
2974
2975 sreloc = elf_section_data (p->sec)->sreloc;
2976
2977 BFD_ASSERT (sreloc != NULL);
2978
2979 sreloc->size += p->count * bed->s->sizeof_rela;
2980 }
2981
2982 return TRUE;
2983 }
2984
2985 /* Allocate space in .plt, .got and associated reloc sections for
2986 local dynamic relocs. */
2987
2988 static bfd_boolean
2989 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2990 {
2991 struct elf_link_hash_entry *h
2992 = (struct elf_link_hash_entry *) *slot;
2993
2994 if (h->type != STT_GNU_IFUNC
2995 || !h->def_regular
2996 || !h->ref_regular
2997 || !h->forced_local
2998 || h->root.type != bfd_link_hash_defined)
2999 abort ();
3000
3001 return elf_x86_64_allocate_dynrelocs (h, inf);
3002 }
3003
3004 /* Find any dynamic relocs that apply to read-only sections. */
3005
3006 static bfd_boolean
3007 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
3008 void * inf)
3009 {
3010 struct elf_x86_64_link_hash_entry *eh;
3011 struct elf_dyn_relocs *p;
3012
3013 /* Skip local IFUNC symbols. */
3014 if (h->forced_local && h->type == STT_GNU_IFUNC)
3015 return TRUE;
3016
3017 eh = (struct elf_x86_64_link_hash_entry *) h;
3018 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3019 {
3020 asection *s = p->sec->output_section;
3021
3022 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3023 {
3024 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3025
3026 info->flags |= DF_TEXTREL;
3027
3028 if ((info->warn_shared_textrel && bfd_link_pic (info))
3029 || info->error_textrel)
3030 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3031 p->sec->owner, h->root.root.string,
3032 p->sec);
3033
3034 /* Not an error, just cut short the traversal. */
3035 return FALSE;
3036 }
3037 }
3038 return TRUE;
3039 }
3040
3041 /* With the local symbol, foo, we convert
3042 mov foo@GOTPCREL(%rip), %reg
3043 to
3044 lea foo(%rip), %reg
3045 and convert
3046 call/jmp *foo@GOTPCREL(%rip)
3047 to
3048 nop call foo/jmp foo nop
3049 When PIC is false, convert
3050 test %reg, foo@GOTPCREL(%rip)
3051 to
3052 test $foo, %reg
3053 and convert
3054 binop foo@GOTPCREL(%rip), %reg
3055 to
3056 binop $foo, %reg
3057 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
3058 instructions. */
3059
3060 static bfd_boolean
3061 elf_x86_64_convert_load (bfd *abfd, asection *sec,
3062 struct bfd_link_info *link_info)
3063 {
3064 Elf_Internal_Shdr *symtab_hdr;
3065 Elf_Internal_Rela *internal_relocs;
3066 Elf_Internal_Rela *irel, *irelend;
3067 bfd_byte *contents;
3068 struct elf_x86_64_link_hash_table *htab;
3069 bfd_boolean changed_contents;
3070 bfd_boolean changed_relocs;
3071 bfd_signed_vma *local_got_refcounts;
3072 bfd_vma maxpagesize;
3073
3074 /* Don't even try to convert non-ELF outputs. */
3075 if (!is_elf_hash_table (link_info->hash))
3076 return FALSE;
3077
3078 /* Nothing to do if there is no need or no output. */
3079 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3080 || sec->need_convert_load == 0
3081 || bfd_is_abs_section (sec->output_section))
3082 return TRUE;
3083
3084 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3085
3086 /* Load the relocations for this section. */
3087 internal_relocs = (_bfd_elf_link_read_relocs
3088 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3089 link_info->keep_memory));
3090 if (internal_relocs == NULL)
3091 return FALSE;
3092
3093 htab = elf_x86_64_hash_table (link_info);
3094 changed_contents = FALSE;
3095 changed_relocs = FALSE;
3096 local_got_refcounts = elf_local_got_refcounts (abfd);
3097 maxpagesize = get_elf_backend_data (abfd)->maxpagesize;
3098
3099 /* Get the section contents. */
3100 if (elf_section_data (sec)->this_hdr.contents != NULL)
3101 contents = elf_section_data (sec)->this_hdr.contents;
3102 else
3103 {
3104 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3105 goto error_return;
3106 }
3107
3108 irelend = internal_relocs + sec->reloc_count;
3109 for (irel = internal_relocs; irel < irelend; irel++)
3110 {
3111 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3112 unsigned int r_symndx = htab->r_sym (irel->r_info);
3113 unsigned int indx;
3114 struct elf_link_hash_entry *h;
3115 asection *tsec;
3116 char symtype;
3117 bfd_vma toff, roff;
3118 bfd_signed_vma raddend;
3119 unsigned int opcode;
3120 unsigned int modrm;
3121
3122 if (r_type != R_X86_64_GOTPCREL
3123 && r_type != R_X86_64_GOTPCRELX
3124 && r_type != R_X86_64_REX_GOTPCRELX)
3125 continue;
3126
3127 roff = irel->r_offset;
3128 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
3129 continue;
3130
3131 raddend = irel->r_addend;
3132 /* Addend for 32-bit PC-relative relocation must be -4. */
3133 if (raddend != -4)
3134 continue;
3135
3136 opcode = bfd_get_8 (abfd, contents + roff - 2);
3137
3138 /* It is OK to convert mov to lea. */
3139 if (opcode != 0x8b)
3140 {
3141 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
3142 for mov call, jmp or one of adc, add, and, cmp, or, sbb,
3143 sub, test, xor instructions. */
3144 if (r_type != R_X86_64_GOTPCRELX
3145 && r_type != R_X86_64_REX_GOTPCRELX)
3146 continue;
3147
3148 /* It is OK to convert indirect branch to direct branch. */
3149 if (opcode != 0xff)
3150 {
3151 /* It is OK to convert adc, add, and, cmp, or, sbb, sub,
3152 test, xor only when PIC is false. */
3153 if (bfd_link_pic (link_info))
3154 continue;
3155 }
3156 }
3157
3158 /* Get the symbol referred to by the reloc. */
3159 if (r_symndx < symtab_hdr->sh_info)
3160 {
3161 Elf_Internal_Sym *isym;
3162
3163 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
3164 abfd, r_symndx);
3165
3166 symtype = ELF_ST_TYPE (isym->st_info);
3167
3168 /* STT_GNU_IFUNC must keep GOTPCREL relocations and skip
3169 relocation against undefined symbols. */
3170 if (symtype == STT_GNU_IFUNC || isym->st_shndx == SHN_UNDEF)
3171 continue;
3172
3173 if (isym->st_shndx == SHN_ABS)
3174 tsec = bfd_abs_section_ptr;
3175 else if (isym->st_shndx == SHN_COMMON)
3176 tsec = bfd_com_section_ptr;
3177 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
3178 tsec = &_bfd_elf_large_com_section;
3179 else
3180 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3181
3182 h = NULL;
3183 toff = isym->st_value;
3184 }
3185 else
3186 {
3187 indx = r_symndx - symtab_hdr->sh_info;
3188 h = elf_sym_hashes (abfd)[indx];
3189 BFD_ASSERT (h != NULL);
3190
3191 while (h->root.type == bfd_link_hash_indirect
3192 || h->root.type == bfd_link_hash_warning)
3193 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3194
3195 /* STT_GNU_IFUNC must keep GOTPCREL relocations. We also
3196 avoid optimizing GOTPCREL relocations againt _DYNAMIC
3197 since ld.so may use its link-time address. */
3198 if ((h->def_regular
3199 || h->root.type == bfd_link_hash_defined
3200 || h->root.type == bfd_link_hash_defweak)
3201 && h->type != STT_GNU_IFUNC
3202 && h != htab->elf.hdynamic
3203 && SYMBOL_REFERENCES_LOCAL (link_info, h))
3204 {
3205 /* bfd_link_hash_new or bfd_link_hash_undefined is
3206 set by an assignment in a linker script in
3207 bfd_elf_record_link_assignment. FIXME: If we
3208 ever get a linker error due relocation overflow,
3209 we will skip this optimization. */
3210 if (h->def_regular
3211 && (h->root.type == bfd_link_hash_new
3212 || h->root.type == bfd_link_hash_undefined))
3213 goto convert;
3214 tsec = h->root.u.def.section;
3215 toff = h->root.u.def.value;
3216 symtype = h->type;
3217 }
3218 else
3219 continue;
3220 }
3221
3222 if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
3223 {
3224 /* At this stage in linking, no SEC_MERGE symbol has been
3225 adjusted, so all references to such symbols need to be
3226 passed through _bfd_merged_section_offset. (Later, in
3227 relocate_section, all SEC_MERGE symbols *except* for
3228 section symbols have been adjusted.)
3229
3230 gas may reduce relocations against symbols in SEC_MERGE
3231 sections to a relocation against the section symbol when
3232 the original addend was zero. When the reloc is against
3233 a section symbol we should include the addend in the
3234 offset passed to _bfd_merged_section_offset, since the
3235 location of interest is the original symbol. On the
3236 other hand, an access to "sym+addend" where "sym" is not
3237 a section symbol should not include the addend; Such an
3238 access is presumed to be an offset from "sym"; The
3239 location of interest is just "sym". */
3240 if (symtype == STT_SECTION)
3241 toff += raddend;
3242
3243 toff = _bfd_merged_section_offset (abfd, &tsec,
3244 elf_section_data (tsec)->sec_info,
3245 toff);
3246
3247 if (symtype != STT_SECTION)
3248 toff += raddend;
3249 }
3250 else
3251 toff += raddend;
3252
3253 /* Don't convert if R_X86_64_PC32 relocation overflows. */
3254 if (tsec->output_section == sec->output_section)
3255 {
3256 if ((toff - roff + 0x80000000) > 0xffffffff)
3257 continue;
3258 }
3259 else
3260 {
3261 bfd_signed_vma distance;
3262
3263 /* At this point, we don't know the load addresses of TSEC
3264 section nor SEC section. We estimate the distrance between
3265 SEC and TSEC. We store the estimated distances in the
3266 compressed_size field of the output section, which is only
3267 used to decompress the compressed input section. */
3268 if (sec->output_section->compressed_size == 0)
3269 {
3270 asection *asect;
3271 bfd_size_type size = 0;
3272 for (asect = link_info->output_bfd->sections;
3273 asect != NULL;
3274 asect = asect->next)
3275 {
3276 asection *i;
3277 for (i = asect->map_head.s;
3278 i != NULL;
3279 i = i->map_head.s)
3280 {
3281 size = align_power (size, i->alignment_power);
3282 size += i->size;
3283 }
3284 asect->compressed_size = size;
3285 }
3286 }
3287
3288 /* Don't convert GOTPCREL relocations if TSEC isn't placed
3289 after SEC. */
3290 distance = (tsec->output_section->compressed_size
3291 - sec->output_section->compressed_size);
3292 if (distance < 0)
3293 continue;
3294
3295 /* Take PT_GNU_RELRO segment into account by adding
3296 maxpagesize. */
3297 if ((toff + distance + maxpagesize - roff + 0x80000000)
3298 > 0xffffffff)
3299 continue;
3300 }
3301
3302 convert:
3303 if (opcode == 0xff)
3304 {
3305 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
3306 unsigned int nop;
3307 unsigned int disp;
3308 bfd_vma nop_offset;
3309
3310 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
3311 R_X86_64_PC32. */
3312 modrm = bfd_get_8 (abfd, contents + roff - 1);
3313 if (modrm == 0x25)
3314 {
3315 /* Convert to "jmp foo nop". */
3316 modrm = 0xe9;
3317 nop = NOP_OPCODE;
3318 nop_offset = irel->r_offset + 3;
3319 disp = bfd_get_32 (abfd, contents + irel->r_offset);
3320 irel->r_offset -= 1;
3321 bfd_put_32 (abfd, disp, contents + irel->r_offset);
3322 }
3323 else
3324 {
3325 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
3326 is a nop prefix. */
3327 modrm = 0xe8;
3328 nop = link_info->call_nop_byte;
3329 if (link_info->call_nop_as_suffix)
3330 {
3331 nop_offset = irel->r_offset + 3;
3332 disp = bfd_get_32 (abfd, contents + irel->r_offset);
3333 irel->r_offset -= 1;
3334 bfd_put_32 (abfd, disp, contents + irel->r_offset);
3335 }
3336 else
3337 nop_offset = irel->r_offset - 2;
3338 }
3339 bfd_put_8 (abfd, nop, contents + nop_offset);
3340 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
3341 r_type = R_X86_64_PC32;
3342 }
3343 else
3344 {
3345 if (opcode == 0x8b)
3346 {
3347 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
3348 "lea foo(%rip), %reg". */
3349 opcode = 0x8d;
3350 r_type = R_X86_64_PC32;
3351 }
3352 else
3353 {
3354 modrm = bfd_get_8 (abfd, contents + roff - 1);
3355 if (opcode == 0x85)
3356 {
3357 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
3358 "test $foo, %reg". */
3359 modrm = 0xc0 | (modrm & 0x38) >> 3;
3360 opcode = 0xf7;
3361 }
3362 else
3363 {
3364 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
3365 "binop $foo, %reg". */
3366 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
3367 opcode = 0x81;
3368 }
3369 bfd_put_8 (abfd, modrm, contents + roff - 1);
3370
3371 if (r_type == R_X86_64_REX_GOTPCRELX)
3372 {
3373 /* Move the R bit to the B bit in REX byte. */
3374 unsigned int rex = bfd_get_8 (abfd, contents + roff - 3);
3375 rex = (rex & ~REX_R) | (rex & REX_R) >> 2;
3376 bfd_put_8 (abfd, rex, contents + roff - 3);
3377 }
3378 /* No addend for R_X86_64_32S relocation. */
3379 irel->r_addend = 0;
3380 r_type = R_X86_64_32S;
3381 }
3382
3383 bfd_put_8 (abfd, opcode, contents + roff - 2);
3384 }
3385
3386 irel->r_info = htab->r_info (r_symndx, r_type);
3387 changed_contents = TRUE;
3388 changed_relocs = TRUE;
3389
3390 if (h)
3391 {
3392 if (h->got.refcount > 0)
3393 h->got.refcount -= 1;
3394 }
3395 else
3396 {
3397 if (local_got_refcounts != NULL
3398 && local_got_refcounts[r_symndx] > 0)
3399 local_got_refcounts[r_symndx] -= 1;
3400 }
3401 }
3402
3403 if (contents != NULL
3404 && elf_section_data (sec)->this_hdr.contents != contents)
3405 {
3406 if (!changed_contents && !link_info->keep_memory)
3407 free (contents);
3408 else
3409 {
3410 /* Cache the section contents for elf_link_input_bfd. */
3411 elf_section_data (sec)->this_hdr.contents = contents;
3412 }
3413 }
3414
3415 if (elf_section_data (sec)->relocs != internal_relocs)
3416 {
3417 if (!changed_relocs)
3418 free (internal_relocs);
3419 else
3420 elf_section_data (sec)->relocs = internal_relocs;
3421 }
3422
3423 return TRUE;
3424
3425 error_return:
3426 if (contents != NULL
3427 && elf_section_data (sec)->this_hdr.contents != contents)
3428 free (contents);
3429 if (internal_relocs != NULL
3430 && elf_section_data (sec)->relocs != internal_relocs)
3431 free (internal_relocs);
3432 return FALSE;
3433 }
3434
3435 /* Set the sizes of the dynamic sections. */
3436
3437 static bfd_boolean
3438 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3439 struct bfd_link_info *info)
3440 {
3441 struct elf_x86_64_link_hash_table *htab;
3442 bfd *dynobj;
3443 asection *s;
3444 bfd_boolean relocs;
3445 bfd *ibfd;
3446 const struct elf_backend_data *bed;
3447
3448 htab = elf_x86_64_hash_table (info);
3449 if (htab == NULL)
3450 return FALSE;
3451 bed = get_elf_backend_data (output_bfd);
3452
3453 dynobj = htab->elf.dynobj;
3454 if (dynobj == NULL)
3455 abort ();
3456
3457 if (htab->elf.dynamic_sections_created)
3458 {
3459 /* Set the contents of the .interp section to the interpreter. */
3460 if (bfd_link_executable (info) && !info->nointerp)
3461 {
3462 s = bfd_get_linker_section (dynobj, ".interp");
3463 if (s == NULL)
3464 abort ();
3465 s->size = htab->dynamic_interpreter_size;
3466 s->contents = (unsigned char *) htab->dynamic_interpreter;
3467 htab->interp = s;
3468 }
3469 }
3470
3471 /* Set up .got offsets for local syms, and space for local dynamic
3472 relocs. */
3473 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3474 {
3475 bfd_signed_vma *local_got;
3476 bfd_signed_vma *end_local_got;
3477 char *local_tls_type;
3478 bfd_vma *local_tlsdesc_gotent;
3479 bfd_size_type locsymcount;
3480 Elf_Internal_Shdr *symtab_hdr;
3481 asection *srel;
3482
3483 if (! is_x86_64_elf (ibfd))
3484 continue;
3485
3486 for (s = ibfd->sections; s != NULL; s = s->next)
3487 {
3488 struct elf_dyn_relocs *p;
3489
3490 if (!elf_x86_64_convert_load (ibfd, s, info))
3491 return FALSE;
3492
3493 for (p = (struct elf_dyn_relocs *)
3494 (elf_section_data (s)->local_dynrel);
3495 p != NULL;
3496 p = p->next)
3497 {
3498 if (!bfd_is_abs_section (p->sec)
3499 && bfd_is_abs_section (p->sec->output_section))
3500 {
3501 /* Input section has been discarded, either because
3502 it is a copy of a linkonce section or due to
3503 linker script /DISCARD/, so we'll be discarding
3504 the relocs too. */
3505 }
3506 else if (p->count != 0)
3507 {
3508 srel = elf_section_data (p->sec)->sreloc;
3509 srel->size += p->count * bed->s->sizeof_rela;
3510 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3511 && (info->flags & DF_TEXTREL) == 0)
3512 {
3513 info->flags |= DF_TEXTREL;
3514 if ((info->warn_shared_textrel && bfd_link_pic (info))
3515 || info->error_textrel)
3516 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3517 p->sec->owner, p->sec);
3518 }
3519 }
3520 }
3521 }
3522
3523 local_got = elf_local_got_refcounts (ibfd);
3524 if (!local_got)
3525 continue;
3526
3527 symtab_hdr = &elf_symtab_hdr (ibfd);
3528 locsymcount = symtab_hdr->sh_info;
3529 end_local_got = local_got + locsymcount;
3530 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
3531 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
3532 s = htab->elf.sgot;
3533 srel = htab->elf.srelgot;
3534 for (; local_got < end_local_got;
3535 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3536 {
3537 *local_tlsdesc_gotent = (bfd_vma) -1;
3538 if (*local_got > 0)
3539 {
3540 if (GOT_TLS_GDESC_P (*local_tls_type))
3541 {
3542 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3543 - elf_x86_64_compute_jump_table_size (htab);
3544 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3545 *local_got = (bfd_vma) -2;
3546 }
3547 if (! GOT_TLS_GDESC_P (*local_tls_type)
3548 || GOT_TLS_GD_P (*local_tls_type))
3549 {
3550 *local_got = s->size;
3551 s->size += GOT_ENTRY_SIZE;
3552 if (GOT_TLS_GD_P (*local_tls_type))
3553 s->size += GOT_ENTRY_SIZE;
3554 }
3555 if (bfd_link_pic (info)
3556 || GOT_TLS_GD_ANY_P (*local_tls_type)
3557 || *local_tls_type == GOT_TLS_IE)
3558 {
3559 if (GOT_TLS_GDESC_P (*local_tls_type))
3560 {
3561 htab->elf.srelplt->size
3562 += bed->s->sizeof_rela;
3563 htab->tlsdesc_plt = (bfd_vma) -1;
3564 }
3565 if (! GOT_TLS_GDESC_P (*local_tls_type)
3566 || GOT_TLS_GD_P (*local_tls_type))
3567 srel->size += bed->s->sizeof_rela;
3568 }
3569 }
3570 else
3571 *local_got = (bfd_vma) -1;
3572 }
3573 }
3574
3575 if (htab->tls_ld_got.refcount > 0)
3576 {
3577 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3578 relocs. */
3579 htab->tls_ld_got.offset = htab->elf.sgot->size;
3580 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3581 htab->elf.srelgot->size += bed->s->sizeof_rela;
3582 }
3583 else
3584 htab->tls_ld_got.offset = -1;
3585
3586 /* Allocate global sym .plt and .got entries, and space for global
3587 sym dynamic relocs. */
3588 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3589 info);
3590
3591 /* Allocate .plt and .got entries, and space for local symbols. */
3592 htab_traverse (htab->loc_hash_table,
3593 elf_x86_64_allocate_local_dynrelocs,
3594 info);
3595
3596 /* For every jump slot reserved in the sgotplt, reloc_count is
3597 incremented. However, when we reserve space for TLS descriptors,
3598 it's not incremented, so in order to compute the space reserved
3599 for them, it suffices to multiply the reloc count by the jump
3600 slot size.
3601
3602 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3603 so that R_X86_64_IRELATIVE entries come last. */
3604 if (htab->elf.srelplt)
3605 {
3606 htab->sgotplt_jump_table_size
3607 = elf_x86_64_compute_jump_table_size (htab);
3608 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3609 }
3610 else if (htab->elf.irelplt)
3611 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3612
3613 if (htab->tlsdesc_plt)
3614 {
3615 /* If we're not using lazy TLS relocations, don't generate the
3616 PLT and GOT entries they require. */
3617 if ((info->flags & DF_BIND_NOW))
3618 htab->tlsdesc_plt = 0;
3619 else
3620 {
3621 htab->tlsdesc_got = htab->elf.sgot->size;
3622 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3623 /* Reserve room for the initial entry.
3624 FIXME: we could probably do away with it in this case. */
3625 if (htab->elf.splt->size == 0)
3626 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3627 htab->tlsdesc_plt = htab->elf.splt->size;
3628 htab->elf.splt->size += GET_PLT_ENTRY_SIZE (output_bfd);
3629 }
3630 }
3631
3632 if (htab->elf.sgotplt)
3633 {
3634 /* Don't allocate .got.plt section if there are no GOT nor PLT
3635 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3636 if ((htab->elf.hgot == NULL
3637 || !htab->elf.hgot->ref_regular_nonweak)
3638 && (htab->elf.sgotplt->size
3639 == get_elf_backend_data (output_bfd)->got_header_size)
3640 && (htab->elf.splt == NULL
3641 || htab->elf.splt->size == 0)
3642 && (htab->elf.sgot == NULL
3643 || htab->elf.sgot->size == 0)
3644 && (htab->elf.iplt == NULL
3645 || htab->elf.iplt->size == 0)
3646 && (htab->elf.igotplt == NULL
3647 || htab->elf.igotplt->size == 0))
3648 htab->elf.sgotplt->size = 0;
3649 }
3650
3651 if (htab->plt_eh_frame != NULL
3652 && htab->elf.splt != NULL
3653 && htab->elf.splt->size != 0
3654 && !bfd_is_abs_section (htab->elf.splt->output_section)
3655 && _bfd_elf_eh_frame_present (info))
3656 {
3657 const struct elf_x86_64_backend_data *arch_data
3658 = get_elf_x86_64_arch_data (bed);
3659 htab->plt_eh_frame->size = arch_data->eh_frame_plt_size;
3660 }
3661
3662 /* We now have determined the sizes of the various dynamic sections.
3663 Allocate memory for them. */
3664 relocs = FALSE;
3665 for (s = dynobj->sections; s != NULL; s = s->next)
3666 {
3667 if ((s->flags & SEC_LINKER_CREATED) == 0)
3668 continue;
3669
3670 if (s == htab->elf.splt
3671 || s == htab->elf.sgot
3672 || s == htab->elf.sgotplt
3673 || s == htab->elf.iplt
3674 || s == htab->elf.igotplt
3675 || s == htab->plt_bnd
3676 || s == htab->plt_got
3677 || s == htab->plt_eh_frame
3678 || s == htab->sdynbss)
3679 {
3680 /* Strip this section if we don't need it; see the
3681 comment below. */
3682 }
3683 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3684 {
3685 if (s->size != 0 && s != htab->elf.srelplt)
3686 relocs = TRUE;
3687
3688 /* We use the reloc_count field as a counter if we need
3689 to copy relocs into the output file. */
3690 if (s != htab->elf.srelplt)
3691 s->reloc_count = 0;
3692 }
3693 else
3694 {
3695 /* It's not one of our sections, so don't allocate space. */
3696 continue;
3697 }
3698
3699 if (s->size == 0)
3700 {
3701 /* If we don't need this section, strip it from the
3702 output file. This is mostly to handle .rela.bss and
3703 .rela.plt. We must create both sections in
3704 create_dynamic_sections, because they must be created
3705 before the linker maps input sections to output
3706 sections. The linker does that before
3707 adjust_dynamic_symbol is called, and it is that
3708 function which decides whether anything needs to go
3709 into these sections. */
3710
3711 s->flags |= SEC_EXCLUDE;
3712 continue;
3713 }
3714
3715 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3716 continue;
3717
3718 /* Allocate memory for the section contents. We use bfd_zalloc
3719 here in case unused entries are not reclaimed before the
3720 section's contents are written out. This should not happen,
3721 but this way if it does, we get a R_X86_64_NONE reloc instead
3722 of garbage. */
3723 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3724 if (s->contents == NULL)
3725 return FALSE;
3726 }
3727
3728 if (htab->plt_eh_frame != NULL
3729 && htab->plt_eh_frame->contents != NULL)
3730 {
3731 const struct elf_x86_64_backend_data *arch_data
3732 = get_elf_x86_64_arch_data (bed);
3733
3734 memcpy (htab->plt_eh_frame->contents,
3735 arch_data->eh_frame_plt, htab->plt_eh_frame->size);
3736 bfd_put_32 (dynobj, htab->elf.splt->size,
3737 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3738 }
3739
3740 if (htab->elf.dynamic_sections_created)
3741 {
3742 /* Add some entries to the .dynamic section. We fill in the
3743 values later, in elf_x86_64_finish_dynamic_sections, but we
3744 must add the entries now so that we get the correct size for
3745 the .dynamic section. The DT_DEBUG entry is filled in by the
3746 dynamic linker and used by the debugger. */
3747 #define add_dynamic_entry(TAG, VAL) \
3748 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3749
3750 if (bfd_link_executable (info))
3751 {
3752 if (!add_dynamic_entry (DT_DEBUG, 0))
3753 return FALSE;
3754 }
3755
3756 if (htab->elf.splt->size != 0)
3757 {
3758 /* DT_PLTGOT is used by prelink even if there is no PLT
3759 relocation. */
3760 if (!add_dynamic_entry (DT_PLTGOT, 0))
3761 return FALSE;
3762
3763 if (htab->elf.srelplt->size != 0)
3764 {
3765 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3766 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3767 || !add_dynamic_entry (DT_JMPREL, 0))
3768 return FALSE;
3769 }
3770
3771 if (htab->tlsdesc_plt
3772 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3773 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3774 return FALSE;
3775 }
3776
3777 if (relocs)
3778 {
3779 if (!add_dynamic_entry (DT_RELA, 0)
3780 || !add_dynamic_entry (DT_RELASZ, 0)
3781 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3782 return FALSE;
3783
3784 /* If any dynamic relocs apply to a read-only section,
3785 then we need a DT_TEXTREL entry. */
3786 if ((info->flags & DF_TEXTREL) == 0)
3787 elf_link_hash_traverse (&htab->elf,
3788 elf_x86_64_readonly_dynrelocs,
3789 info);
3790
3791 if ((info->flags & DF_TEXTREL) != 0)
3792 {
3793 if ((elf_tdata (output_bfd)->has_gnu_symbols
3794 & elf_gnu_symbol_ifunc) == elf_gnu_symbol_ifunc)
3795 {
3796 info->callbacks->einfo
3797 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3798 bfd_set_error (bfd_error_bad_value);
3799 return FALSE;
3800 }
3801
3802 if (!add_dynamic_entry (DT_TEXTREL, 0))
3803 return FALSE;
3804 }
3805 }
3806 }
3807 #undef add_dynamic_entry
3808
3809 return TRUE;
3810 }
3811
3812 static bfd_boolean
3813 elf_x86_64_always_size_sections (bfd *output_bfd,
3814 struct bfd_link_info *info)
3815 {
3816 asection *tls_sec = elf_hash_table (info)->tls_sec;
3817
3818 if (tls_sec)
3819 {
3820 struct elf_link_hash_entry *tlsbase;
3821
3822 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3823 "_TLS_MODULE_BASE_",
3824 FALSE, FALSE, FALSE);
3825
3826 if (tlsbase && tlsbase->type == STT_TLS)
3827 {
3828 struct elf_x86_64_link_hash_table *htab;
3829 struct bfd_link_hash_entry *bh = NULL;
3830 const struct elf_backend_data *bed
3831 = get_elf_backend_data (output_bfd);
3832
3833 htab = elf_x86_64_hash_table (info);
3834 if (htab == NULL)
3835 return FALSE;
3836
3837 if (!(_bfd_generic_link_add_one_symbol
3838 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3839 tls_sec, 0, NULL, FALSE,
3840 bed->collect, &bh)))
3841 return FALSE;
3842
3843 htab->tls_module_base = bh;
3844
3845 tlsbase = (struct elf_link_hash_entry *)bh;
3846 tlsbase->def_regular = 1;
3847 tlsbase->other = STV_HIDDEN;
3848 tlsbase->root.linker_def = 1;
3849 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3850 }
3851 }
3852
3853 return TRUE;
3854 }
3855
3856 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3857 executables. Rather than setting it to the beginning of the TLS
3858 section, we have to set it to the end. This function may be called
3859 multiple times, it is idempotent. */
3860
3861 static void
3862 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
3863 {
3864 struct elf_x86_64_link_hash_table *htab;
3865 struct bfd_link_hash_entry *base;
3866
3867 if (!bfd_link_executable (info))
3868 return;
3869
3870 htab = elf_x86_64_hash_table (info);
3871 if (htab == NULL)
3872 return;
3873
3874 base = htab->tls_module_base;
3875 if (base == NULL)
3876 return;
3877
3878 base->u.def.value = htab->elf.tls_size;
3879 }
3880
3881 /* Return the base VMA address which should be subtracted from real addresses
3882 when resolving @dtpoff relocation.
3883 This is PT_TLS segment p_vaddr. */
3884
3885 static bfd_vma
3886 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
3887 {
3888 /* If tls_sec is NULL, we should have signalled an error already. */
3889 if (elf_hash_table (info)->tls_sec == NULL)
3890 return 0;
3891 return elf_hash_table (info)->tls_sec->vma;
3892 }
3893
3894 /* Return the relocation value for @tpoff relocation
3895 if STT_TLS virtual address is ADDRESS. */
3896
3897 static bfd_vma
3898 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3899 {
3900 struct elf_link_hash_table *htab = elf_hash_table (info);
3901 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3902 bfd_vma static_tls_size;
3903
3904 /* If tls_segment is NULL, we should have signalled an error already. */
3905 if (htab->tls_sec == NULL)
3906 return 0;
3907
3908 /* Consider special static TLS alignment requirements. */
3909 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3910 return address - static_tls_size - htab->tls_sec->vma;
3911 }
3912
3913 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3914 branch? */
3915
3916 static bfd_boolean
3917 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3918 {
3919 /* Opcode Instruction
3920 0xe8 call
3921 0xe9 jump
3922 0x0f 0x8x conditional jump */
3923 return ((offset > 0
3924 && (contents [offset - 1] == 0xe8
3925 || contents [offset - 1] == 0xe9))
3926 || (offset > 1
3927 && contents [offset - 2] == 0x0f
3928 && (contents [offset - 1] & 0xf0) == 0x80));
3929 }
3930
3931 static bfd_boolean
3932 elf_x86_64_need_pic (bfd *input_bfd, struct elf_link_hash_entry *h,
3933 reloc_howto_type *howto)
3934 {
3935 const char *fmt;
3936 const char *v;
3937 const char *pic = "";
3938
3939 switch (ELF_ST_VISIBILITY (h->other))
3940 {
3941 case STV_HIDDEN:
3942 v = _("hidden symbol");
3943 break;
3944 case STV_INTERNAL:
3945 v = _("internal symbol");
3946 break;
3947 case STV_PROTECTED:
3948 v = _("protected symbol");
3949 break;
3950 default:
3951 v = _("symbol");
3952 pic = _("; recompile with -fPIC");
3953 break;
3954 }
3955
3956 if (h->def_regular)
3957 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3958 else
3959 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3960
3961 (*_bfd_error_handler) (fmt, input_bfd, howto->name,
3962 v, h->root.root.string, pic);
3963 bfd_set_error (bfd_error_bad_value);
3964 return FALSE;
3965 }
3966
3967 /* Relocate an x86_64 ELF section. */
3968
3969 static bfd_boolean
3970 elf_x86_64_relocate_section (bfd *output_bfd,
3971 struct bfd_link_info *info,
3972 bfd *input_bfd,
3973 asection *input_section,
3974 bfd_byte *contents,
3975 Elf_Internal_Rela *relocs,
3976 Elf_Internal_Sym *local_syms,
3977 asection **local_sections)
3978 {
3979 struct elf_x86_64_link_hash_table *htab;
3980 Elf_Internal_Shdr *symtab_hdr;
3981 struct elf_link_hash_entry **sym_hashes;
3982 bfd_vma *local_got_offsets;
3983 bfd_vma *local_tlsdesc_gotents;
3984 Elf_Internal_Rela *rel;
3985 Elf_Internal_Rela *wrel;
3986 Elf_Internal_Rela *relend;
3987 const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
3988
3989 BFD_ASSERT (is_x86_64_elf (input_bfd));
3990
3991 htab = elf_x86_64_hash_table (info);
3992 if (htab == NULL)
3993 return FALSE;
3994 symtab_hdr = &elf_symtab_hdr (input_bfd);
3995 sym_hashes = elf_sym_hashes (input_bfd);
3996 local_got_offsets = elf_local_got_offsets (input_bfd);
3997 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
3998
3999 elf_x86_64_set_tls_module_base (info);
4000
4001 rel = wrel = relocs;
4002 relend = relocs + input_section->reloc_count;
4003 for (; rel < relend; wrel++, rel++)
4004 {
4005 unsigned int r_type;
4006 reloc_howto_type *howto;
4007 unsigned long r_symndx;
4008 struct elf_link_hash_entry *h;
4009 struct elf_x86_64_link_hash_entry *eh;
4010 Elf_Internal_Sym *sym;
4011 asection *sec;
4012 bfd_vma off, offplt, plt_offset;
4013 bfd_vma relocation;
4014 bfd_boolean unresolved_reloc;
4015 bfd_reloc_status_type r;
4016 int tls_type;
4017 asection *base_got, *resolved_plt;
4018 bfd_vma st_size;
4019 bfd_boolean resolved_to_zero;
4020
4021 r_type = ELF32_R_TYPE (rel->r_info);
4022 if (r_type == (int) R_X86_64_GNU_VTINHERIT
4023 || r_type == (int) R_X86_64_GNU_VTENTRY)
4024 {
4025 if (wrel != rel)
4026 *wrel = *rel;
4027 continue;
4028 }
4029
4030 if (r_type >= (int) R_X86_64_standard)
4031 {
4032 (*_bfd_error_handler)
4033 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
4034 input_bfd, input_section, r_type);
4035 bfd_set_error (bfd_error_bad_value);
4036 return FALSE;
4037 }
4038
4039 if (r_type != (int) R_X86_64_32
4040 || ABI_64_P (output_bfd))
4041 howto = x86_64_elf_howto_table + r_type;
4042 else
4043 howto = (x86_64_elf_howto_table
4044 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
4045 r_symndx = htab->r_sym (rel->r_info);
4046 h = NULL;
4047 sym = NULL;
4048 sec = NULL;
4049 unresolved_reloc = FALSE;
4050 if (r_symndx < symtab_hdr->sh_info)
4051 {
4052 sym = local_syms + r_symndx;
4053 sec = local_sections[r_symndx];
4054
4055 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
4056 &sec, rel);
4057 st_size = sym->st_size;
4058
4059 /* Relocate against local STT_GNU_IFUNC symbol. */
4060 if (!bfd_link_relocatable (info)
4061 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4062 {
4063 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
4064 rel, FALSE);
4065 if (h == NULL)
4066 abort ();
4067
4068 /* Set STT_GNU_IFUNC symbol value. */
4069 h->root.u.def.value = sym->st_value;
4070 h->root.u.def.section = sec;
4071 }
4072 }
4073 else
4074 {
4075 bfd_boolean warned ATTRIBUTE_UNUSED;
4076 bfd_boolean ignored ATTRIBUTE_UNUSED;
4077
4078 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
4079 r_symndx, symtab_hdr, sym_hashes,
4080 h, sec, relocation,
4081 unresolved_reloc, warned, ignored);
4082 st_size = h->size;
4083 }
4084
4085 if (sec != NULL && discarded_section (sec))
4086 {
4087 _bfd_clear_contents (howto, input_bfd, input_section,
4088 contents + rel->r_offset);
4089 wrel->r_offset = rel->r_offset;
4090 wrel->r_info = 0;
4091 wrel->r_addend = 0;
4092
4093 /* For ld -r, remove relocations in debug sections against
4094 sections defined in discarded sections. Not done for
4095 eh_frame editing code expects to be present. */
4096 if (bfd_link_relocatable (info)
4097 && (input_section->flags & SEC_DEBUGGING))
4098 wrel--;
4099
4100 continue;
4101 }
4102
4103 if (bfd_link_relocatable (info))
4104 {
4105 if (wrel != rel)
4106 *wrel = *rel;
4107 continue;
4108 }
4109
4110 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
4111 {
4112 if (r_type == R_X86_64_64)
4113 {
4114 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
4115 zero-extend it to 64bit if addend is zero. */
4116 r_type = R_X86_64_32;
4117 memset (contents + rel->r_offset + 4, 0, 4);
4118 }
4119 else if (r_type == R_X86_64_SIZE64)
4120 {
4121 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
4122 zero-extend it to 64bit if addend is zero. */
4123 r_type = R_X86_64_SIZE32;
4124 memset (contents + rel->r_offset + 4, 0, 4);
4125 }
4126 }
4127
4128 eh = (struct elf_x86_64_link_hash_entry *) h;
4129
4130 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4131 it here if it is defined in a non-shared object. */
4132 if (h != NULL
4133 && h->type == STT_GNU_IFUNC
4134 && h->def_regular)
4135 {
4136 bfd_vma plt_index;
4137 const char *name;
4138
4139 if ((input_section->flags & SEC_ALLOC) == 0)
4140 {
4141 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4142 sections because such sections are not SEC_ALLOC and
4143 thus ld.so will not process them. */
4144 if ((input_section->flags & SEC_DEBUGGING) != 0)
4145 continue;
4146 abort ();
4147 }
4148 else if (h->plt.offset == (bfd_vma) -1)
4149 abort ();
4150
4151 /* STT_GNU_IFUNC symbol must go through PLT. */
4152 if (htab->elf.splt != NULL)
4153 {
4154 if (htab->plt_bnd != NULL)
4155 {
4156 resolved_plt = htab->plt_bnd;
4157 plt_offset = eh->plt_bnd.offset;
4158 }
4159 else
4160 {
4161 resolved_plt = htab->elf.splt;
4162 plt_offset = h->plt.offset;
4163 }
4164 }
4165 else
4166 {
4167 resolved_plt = htab->elf.iplt;
4168 plt_offset = h->plt.offset;
4169 }
4170
4171 relocation = (resolved_plt->output_section->vma
4172 + resolved_plt->output_offset + plt_offset);
4173
4174 switch (r_type)
4175 {
4176 default:
4177 if (h->root.root.string)
4178 name = h->root.root.string;
4179 else
4180 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4181 NULL);
4182 (*_bfd_error_handler)
4183 (_("%B: relocation %s against STT_GNU_IFUNC "
4184 "symbol `%s' isn't handled by %s"), input_bfd,
4185 howto->name, name, __FUNCTION__);
4186 bfd_set_error (bfd_error_bad_value);
4187 return FALSE;
4188
4189 case R_X86_64_32S:
4190 if (bfd_link_pic (info))
4191 abort ();
4192 goto do_relocation;
4193
4194 case R_X86_64_32:
4195 if (ABI_64_P (output_bfd))
4196 goto do_relocation;
4197 /* FALLTHROUGH */
4198 case R_X86_64_64:
4199 if (rel->r_addend != 0)
4200 {
4201 if (h->root.root.string)
4202 name = h->root.root.string;
4203 else
4204 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4205 sym, NULL);
4206 (*_bfd_error_handler)
4207 (_("%B: relocation %s against STT_GNU_IFUNC "
4208 "symbol `%s' has non-zero addend: %d"),
4209 input_bfd, howto->name, name, rel->r_addend);
4210 bfd_set_error (bfd_error_bad_value);
4211 return FALSE;
4212 }
4213
4214 /* Generate dynamic relcoation only when there is a
4215 non-GOT reference in a shared object. */
4216 if (bfd_link_pic (info) && h->non_got_ref)
4217 {
4218 Elf_Internal_Rela outrel;
4219 asection *sreloc;
4220
4221 /* Need a dynamic relocation to get the real function
4222 address. */
4223 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
4224 info,
4225 input_section,
4226 rel->r_offset);
4227 if (outrel.r_offset == (bfd_vma) -1
4228 || outrel.r_offset == (bfd_vma) -2)
4229 abort ();
4230
4231 outrel.r_offset += (input_section->output_section->vma
4232 + input_section->output_offset);
4233
4234 if (h->dynindx == -1
4235 || h->forced_local
4236 || bfd_link_executable (info))
4237 {
4238 /* This symbol is resolved locally. */
4239 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4240 outrel.r_addend = (h->root.u.def.value
4241 + h->root.u.def.section->output_section->vma
4242 + h->root.u.def.section->output_offset);
4243 }
4244 else
4245 {
4246 outrel.r_info = htab->r_info (h->dynindx, r_type);
4247 outrel.r_addend = 0;
4248 }
4249
4250 sreloc = htab->elf.irelifunc;
4251 elf_append_rela (output_bfd, sreloc, &outrel);
4252
4253 /* If this reloc is against an external symbol, we
4254 do not want to fiddle with the addend. Otherwise,
4255 we need to include the symbol value so that it
4256 becomes an addend for the dynamic reloc. For an
4257 internal symbol, we have updated addend. */
4258 continue;
4259 }
4260 /* FALLTHROUGH */
4261 case R_X86_64_PC32:
4262 case R_X86_64_PC32_BND:
4263 case R_X86_64_PC64:
4264 case R_X86_64_PLT32:
4265 case R_X86_64_PLT32_BND:
4266 goto do_relocation;
4267
4268 case R_X86_64_GOTPCREL:
4269 case R_X86_64_GOTPCRELX:
4270 case R_X86_64_REX_GOTPCRELX:
4271 case R_X86_64_GOTPCREL64:
4272 base_got = htab->elf.sgot;
4273 off = h->got.offset;
4274
4275 if (base_got == NULL)
4276 abort ();
4277
4278 if (off == (bfd_vma) -1)
4279 {
4280 /* We can't use h->got.offset here to save state, or
4281 even just remember the offset, as finish_dynamic_symbol
4282 would use that as offset into .got. */
4283
4284 if (htab->elf.splt != NULL)
4285 {
4286 plt_index = h->plt.offset / plt_entry_size - 1;
4287 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4288 base_got = htab->elf.sgotplt;
4289 }
4290 else
4291 {
4292 plt_index = h->plt.offset / plt_entry_size;
4293 off = plt_index * GOT_ENTRY_SIZE;
4294 base_got = htab->elf.igotplt;
4295 }
4296
4297 if (h->dynindx == -1
4298 || h->forced_local
4299 || info->symbolic)
4300 {
4301 /* This references the local defitionion. We must
4302 initialize this entry in the global offset table.
4303 Since the offset must always be a multiple of 8,
4304 we use the least significant bit to record
4305 whether we have initialized it already.
4306
4307 When doing a dynamic link, we create a .rela.got
4308 relocation entry to initialize the value. This
4309 is done in the finish_dynamic_symbol routine. */
4310 if ((off & 1) != 0)
4311 off &= ~1;
4312 else
4313 {
4314 bfd_put_64 (output_bfd, relocation,
4315 base_got->contents + off);
4316 /* Note that this is harmless for the GOTPLT64
4317 case, as -1 | 1 still is -1. */
4318 h->got.offset |= 1;
4319 }
4320 }
4321 }
4322
4323 relocation = (base_got->output_section->vma
4324 + base_got->output_offset + off);
4325
4326 goto do_relocation;
4327 }
4328 }
4329
4330 resolved_to_zero = (eh != NULL
4331 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
4332
4333 /* When generating a shared object, the relocations handled here are
4334 copied into the output file to be resolved at run time. */
4335 switch (r_type)
4336 {
4337 case R_X86_64_GOT32:
4338 case R_X86_64_GOT64:
4339 /* Relocation is to the entry for this symbol in the global
4340 offset table. */
4341 case R_X86_64_GOTPCREL:
4342 case R_X86_64_GOTPCRELX:
4343 case R_X86_64_REX_GOTPCRELX:
4344 case R_X86_64_GOTPCREL64:
4345 /* Use global offset table entry as symbol value. */
4346 case R_X86_64_GOTPLT64:
4347 /* This is obsolete and treated the the same as GOT64. */
4348 base_got = htab->elf.sgot;
4349
4350 if (htab->elf.sgot == NULL)
4351 abort ();
4352
4353 if (h != NULL)
4354 {
4355 bfd_boolean dyn;
4356
4357 off = h->got.offset;
4358 if (h->needs_plt
4359 && h->plt.offset != (bfd_vma)-1
4360 && off == (bfd_vma)-1)
4361 {
4362 /* We can't use h->got.offset here to save
4363 state, or even just remember the offset, as
4364 finish_dynamic_symbol would use that as offset into
4365 .got. */
4366 bfd_vma plt_index = h->plt.offset / plt_entry_size - 1;
4367 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4368 base_got = htab->elf.sgotplt;
4369 }
4370
4371 dyn = htab->elf.dynamic_sections_created;
4372
4373 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
4374 || (bfd_link_pic (info)
4375 && SYMBOL_REFERENCES_LOCAL (info, h))
4376 || (ELF_ST_VISIBILITY (h->other)
4377 && h->root.type == bfd_link_hash_undefweak))
4378 {
4379 /* This is actually a static link, or it is a -Bsymbolic
4380 link and the symbol is defined locally, or the symbol
4381 was forced to be local because of a version file. We
4382 must initialize this entry in the global offset table.
4383 Since the offset must always be a multiple of 8, we
4384 use the least significant bit to record whether we
4385 have initialized it already.
4386
4387 When doing a dynamic link, we create a .rela.got
4388 relocation entry to initialize the value. This is
4389 done in the finish_dynamic_symbol routine. */
4390 if ((off & 1) != 0)
4391 off &= ~1;
4392 else
4393 {
4394 bfd_put_64 (output_bfd, relocation,
4395 base_got->contents + off);
4396 /* Note that this is harmless for the GOTPLT64 case,
4397 as -1 | 1 still is -1. */
4398 h->got.offset |= 1;
4399 }
4400 }
4401 else
4402 unresolved_reloc = FALSE;
4403 }
4404 else
4405 {
4406 if (local_got_offsets == NULL)
4407 abort ();
4408
4409 off = local_got_offsets[r_symndx];
4410
4411 /* The offset must always be a multiple of 8. We use
4412 the least significant bit to record whether we have
4413 already generated the necessary reloc. */
4414 if ((off & 1) != 0)
4415 off &= ~1;
4416 else
4417 {
4418 bfd_put_64 (output_bfd, relocation,
4419 base_got->contents + off);
4420
4421 if (bfd_link_pic (info))
4422 {
4423 asection *s;
4424 Elf_Internal_Rela outrel;
4425
4426 /* We need to generate a R_X86_64_RELATIVE reloc
4427 for the dynamic linker. */
4428 s = htab->elf.srelgot;
4429 if (s == NULL)
4430 abort ();
4431
4432 outrel.r_offset = (base_got->output_section->vma
4433 + base_got->output_offset
4434 + off);
4435 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4436 outrel.r_addend = relocation;
4437 elf_append_rela (output_bfd, s, &outrel);
4438 }
4439
4440 local_got_offsets[r_symndx] |= 1;
4441 }
4442 }
4443
4444 if (off >= (bfd_vma) -2)
4445 abort ();
4446
4447 relocation = base_got->output_section->vma
4448 + base_got->output_offset + off;
4449 if (r_type != R_X86_64_GOTPCREL
4450 && r_type != R_X86_64_GOTPCRELX
4451 && r_type != R_X86_64_REX_GOTPCRELX
4452 && r_type != R_X86_64_GOTPCREL64)
4453 relocation -= htab->elf.sgotplt->output_section->vma
4454 - htab->elf.sgotplt->output_offset;
4455
4456 break;
4457
4458 case R_X86_64_GOTOFF64:
4459 /* Relocation is relative to the start of the global offset
4460 table. */
4461
4462 /* Check to make sure it isn't a protected function or data
4463 symbol for shared library since it may not be local when
4464 used as function address or with copy relocation. We also
4465 need to make sure that a symbol is referenced locally. */
4466 if (bfd_link_pic (info) && h)
4467 {
4468 if (!h->def_regular)
4469 {
4470 const char *v;
4471
4472 switch (ELF_ST_VISIBILITY (h->other))
4473 {
4474 case STV_HIDDEN:
4475 v = _("hidden symbol");
4476 break;
4477 case STV_INTERNAL:
4478 v = _("internal symbol");
4479 break;
4480 case STV_PROTECTED:
4481 v = _("protected symbol");
4482 break;
4483 default:
4484 v = _("symbol");
4485 break;
4486 }
4487
4488 (*_bfd_error_handler)
4489 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
4490 input_bfd, v, h->root.root.string);
4491 bfd_set_error (bfd_error_bad_value);
4492 return FALSE;
4493 }
4494 else if (!bfd_link_executable (info)
4495 && !SYMBOL_REFERENCES_LOCAL (info, h)
4496 && (h->type == STT_FUNC
4497 || h->type == STT_OBJECT)
4498 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4499 {
4500 (*_bfd_error_handler)
4501 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
4502 input_bfd,
4503 h->type == STT_FUNC ? "function" : "data",
4504 h->root.root.string);
4505 bfd_set_error (bfd_error_bad_value);
4506 return FALSE;
4507 }
4508 }
4509
4510 /* Note that sgot is not involved in this
4511 calculation. We always want the start of .got.plt. If we
4512 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4513 permitted by the ABI, we might have to change this
4514 calculation. */
4515 relocation -= htab->elf.sgotplt->output_section->vma
4516 + htab->elf.sgotplt->output_offset;
4517 break;
4518
4519 case R_X86_64_GOTPC32:
4520 case R_X86_64_GOTPC64:
4521 /* Use global offset table as symbol value. */
4522 relocation = htab->elf.sgotplt->output_section->vma
4523 + htab->elf.sgotplt->output_offset;
4524 unresolved_reloc = FALSE;
4525 break;
4526
4527 case R_X86_64_PLTOFF64:
4528 /* Relocation is PLT entry relative to GOT. For local
4529 symbols it's the symbol itself relative to GOT. */
4530 if (h != NULL
4531 /* See PLT32 handling. */
4532 && h->plt.offset != (bfd_vma) -1
4533 && htab->elf.splt != NULL)
4534 {
4535 if (htab->plt_bnd != NULL)
4536 {
4537 resolved_plt = htab->plt_bnd;
4538 plt_offset = eh->plt_bnd.offset;
4539 }
4540 else
4541 {
4542 resolved_plt = htab->elf.splt;
4543 plt_offset = h->plt.offset;
4544 }
4545
4546 relocation = (resolved_plt->output_section->vma
4547 + resolved_plt->output_offset
4548 + plt_offset);
4549 unresolved_reloc = FALSE;
4550 }
4551
4552 relocation -= htab->elf.sgotplt->output_section->vma
4553 + htab->elf.sgotplt->output_offset;
4554 break;
4555
4556 case R_X86_64_PLT32:
4557 case R_X86_64_PLT32_BND:
4558 /* Relocation is to the entry for this symbol in the
4559 procedure linkage table. */
4560
4561 /* Resolve a PLT32 reloc against a local symbol directly,
4562 without using the procedure linkage table. */
4563 if (h == NULL)
4564 break;
4565
4566 if ((h->plt.offset == (bfd_vma) -1
4567 && eh->plt_got.offset == (bfd_vma) -1)
4568 || htab->elf.splt == NULL)
4569 {
4570 /* We didn't make a PLT entry for this symbol. This
4571 happens when statically linking PIC code, or when
4572 using -Bsymbolic. */
4573 break;
4574 }
4575
4576 if (h->plt.offset != (bfd_vma) -1)
4577 {
4578 if (htab->plt_bnd != NULL)
4579 {
4580 resolved_plt = htab->plt_bnd;
4581 plt_offset = eh->plt_bnd.offset;
4582 }
4583 else
4584 {
4585 resolved_plt = htab->elf.splt;
4586 plt_offset = h->plt.offset;
4587 }
4588 }
4589 else
4590 {
4591 /* Use the GOT PLT. */
4592 resolved_plt = htab->plt_got;
4593 plt_offset = eh->plt_got.offset;
4594 }
4595
4596 relocation = (resolved_plt->output_section->vma
4597 + resolved_plt->output_offset
4598 + plt_offset);
4599 unresolved_reloc = FALSE;
4600 break;
4601
4602 case R_X86_64_SIZE32:
4603 case R_X86_64_SIZE64:
4604 /* Set to symbol size. */
4605 relocation = st_size;
4606 goto direct;
4607
4608 case R_X86_64_PC8:
4609 case R_X86_64_PC16:
4610 case R_X86_64_PC32:
4611 case R_X86_64_PC32_BND:
4612 /* Don't complain about -fPIC if the symbol is undefined when
4613 building executable unless it is unresolved weak symbol. */
4614 if ((input_section->flags & SEC_ALLOC) != 0
4615 && (input_section->flags & SEC_READONLY) != 0
4616 && h != NULL
4617 && ((bfd_link_executable (info)
4618 && h->root.type == bfd_link_hash_undefweak
4619 && !resolved_to_zero)
4620 || (bfd_link_pic (info)
4621 && !(bfd_link_pie (info)
4622 && h->root.type == bfd_link_hash_undefined))))
4623 {
4624 bfd_boolean fail = FALSE;
4625 bfd_boolean branch
4626 = ((r_type == R_X86_64_PC32
4627 || r_type == R_X86_64_PC32_BND)
4628 && is_32bit_relative_branch (contents, rel->r_offset));
4629
4630 if (SYMBOL_REFERENCES_LOCAL (info, h))
4631 {
4632 /* Symbol is referenced locally. Make sure it is
4633 defined locally or for a branch. */
4634 fail = !h->def_regular && !branch;
4635 }
4636 else if (!(bfd_link_pie (info)
4637 && (h->needs_copy || eh->needs_copy)))
4638 {
4639 /* Symbol doesn't need copy reloc and isn't referenced
4640 locally. We only allow branch to symbol with
4641 non-default visibility. */
4642 fail = (!branch
4643 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4644 }
4645
4646 if (fail)
4647 return elf_x86_64_need_pic (input_bfd, h, howto);
4648 }
4649 /* Fall through. */
4650
4651 case R_X86_64_8:
4652 case R_X86_64_16:
4653 case R_X86_64_32:
4654 case R_X86_64_PC64:
4655 case R_X86_64_64:
4656 /* FIXME: The ABI says the linker should make sure the value is
4657 the same when it's zeroextended to 64 bit. */
4658
4659 direct:
4660 if ((input_section->flags & SEC_ALLOC) == 0)
4661 break;
4662
4663 /* Don't copy a pc-relative relocation into the output file
4664 if the symbol needs copy reloc or the symbol is undefined
4665 when building executable. Copy dynamic function pointer
4666 relocations. Don't generate dynamic relocations against
4667 resolved undefined weak symbols in PIE. */
4668 if ((bfd_link_pic (info)
4669 && !(bfd_link_pie (info)
4670 && h != NULL
4671 && (h->needs_copy
4672 || eh->needs_copy
4673 || h->root.type == bfd_link_hash_undefined)
4674 && IS_X86_64_PCREL_TYPE (r_type))
4675 && (h == NULL
4676 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4677 && !resolved_to_zero)
4678 || h->root.type != bfd_link_hash_undefweak))
4679 && ((! IS_X86_64_PCREL_TYPE (r_type)
4680 && r_type != R_X86_64_SIZE32
4681 && r_type != R_X86_64_SIZE64)
4682 || ! SYMBOL_CALLS_LOCAL (info, h)))
4683 || (ELIMINATE_COPY_RELOCS
4684 && !bfd_link_pic (info)
4685 && h != NULL
4686 && h->dynindx != -1
4687 && (!h->non_got_ref
4688 || eh->func_pointer_refcount > 0
4689 || (h->root.type == bfd_link_hash_undefweak
4690 && !resolved_to_zero))
4691 && ((h->def_dynamic
4692 && !h->def_regular)
4693 || h->root.type == bfd_link_hash_undefweak
4694 || h->root.type == bfd_link_hash_undefined)))
4695 {
4696 Elf_Internal_Rela outrel;
4697 bfd_boolean skip, relocate;
4698 asection *sreloc;
4699
4700 /* When generating a shared object, these relocations
4701 are copied into the output file to be resolved at run
4702 time. */
4703 skip = FALSE;
4704 relocate = FALSE;
4705
4706 outrel.r_offset =
4707 _bfd_elf_section_offset (output_bfd, info, input_section,
4708 rel->r_offset);
4709 if (outrel.r_offset == (bfd_vma) -1)
4710 skip = TRUE;
4711 else if (outrel.r_offset == (bfd_vma) -2)
4712 skip = TRUE, relocate = TRUE;
4713
4714 outrel.r_offset += (input_section->output_section->vma
4715 + input_section->output_offset);
4716
4717 if (skip)
4718 memset (&outrel, 0, sizeof outrel);
4719
4720 /* h->dynindx may be -1 if this symbol was marked to
4721 become local. */
4722 else if (h != NULL
4723 && h->dynindx != -1
4724 && (IS_X86_64_PCREL_TYPE (r_type)
4725 || ! bfd_link_pic (info)
4726 || ! SYMBOLIC_BIND (info, h)
4727 || ! h->def_regular))
4728 {
4729 if ((r_type != R_X86_64_PC64 && r_type != R_X86_64_64)
4730 && bfd_link_executable (info)
4731 && h->root.type == bfd_link_hash_undefweak
4732 && !resolved_to_zero)
4733 return elf_x86_64_need_pic (input_bfd, h, howto);
4734 outrel.r_info = htab->r_info (h->dynindx, r_type);
4735 outrel.r_addend = rel->r_addend;
4736 }
4737 else
4738 {
4739 /* This symbol is local, or marked to become local. */
4740 if (r_type == htab->pointer_r_type)
4741 {
4742 relocate = TRUE;
4743 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4744 outrel.r_addend = relocation + rel->r_addend;
4745 }
4746 else if (r_type == R_X86_64_64
4747 && !ABI_64_P (output_bfd))
4748 {
4749 relocate = TRUE;
4750 outrel.r_info = htab->r_info (0,
4751 R_X86_64_RELATIVE64);
4752 outrel.r_addend = relocation + rel->r_addend;
4753 /* Check addend overflow. */
4754 if ((outrel.r_addend & 0x80000000)
4755 != (rel->r_addend & 0x80000000))
4756 {
4757 const char *name;
4758 int addend = rel->r_addend;
4759 if (h && h->root.root.string)
4760 name = h->root.root.string;
4761 else
4762 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4763 sym, NULL);
4764 if (addend < 0)
4765 (*_bfd_error_handler)
4766 (_("%B: addend -0x%x in relocation %s against "
4767 "symbol `%s' at 0x%lx in section `%A' is "
4768 "out of range"),
4769 input_bfd, input_section, addend,
4770 howto->name, name,
4771 (unsigned long) rel->r_offset);
4772 else
4773 (*_bfd_error_handler)
4774 (_("%B: addend 0x%x in relocation %s against "
4775 "symbol `%s' at 0x%lx in section `%A' is "
4776 "out of range"),
4777 input_bfd, input_section, addend,
4778 howto->name, name,
4779 (unsigned long) rel->r_offset);
4780 bfd_set_error (bfd_error_bad_value);
4781 return FALSE;
4782 }
4783 }
4784 else
4785 {
4786 long sindx;
4787
4788 if (bfd_is_abs_section (sec))
4789 sindx = 0;
4790 else if (sec == NULL || sec->owner == NULL)
4791 {
4792 bfd_set_error (bfd_error_bad_value);
4793 return FALSE;
4794 }
4795 else
4796 {
4797 asection *osec;
4798
4799 /* We are turning this relocation into one
4800 against a section symbol. It would be
4801 proper to subtract the symbol's value,
4802 osec->vma, from the emitted reloc addend,
4803 but ld.so expects buggy relocs. */
4804 osec = sec->output_section;
4805 sindx = elf_section_data (osec)->dynindx;
4806 if (sindx == 0)
4807 {
4808 asection *oi = htab->elf.text_index_section;
4809 sindx = elf_section_data (oi)->dynindx;
4810 }
4811 BFD_ASSERT (sindx != 0);
4812 }
4813
4814 outrel.r_info = htab->r_info (sindx, r_type);
4815 outrel.r_addend = relocation + rel->r_addend;
4816 }
4817 }
4818
4819 sreloc = elf_section_data (input_section)->sreloc;
4820
4821 if (sreloc == NULL || sreloc->contents == NULL)
4822 {
4823 r = bfd_reloc_notsupported;
4824 goto check_relocation_error;
4825 }
4826
4827 elf_append_rela (output_bfd, sreloc, &outrel);
4828
4829 /* If this reloc is against an external symbol, we do
4830 not want to fiddle with the addend. Otherwise, we
4831 need to include the symbol value so that it becomes
4832 an addend for the dynamic reloc. */
4833 if (! relocate)
4834 continue;
4835 }
4836
4837 break;
4838
4839 case R_X86_64_TLSGD:
4840 case R_X86_64_GOTPC32_TLSDESC:
4841 case R_X86_64_TLSDESC_CALL:
4842 case R_X86_64_GOTTPOFF:
4843 tls_type = GOT_UNKNOWN;
4844 if (h == NULL && local_got_offsets)
4845 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
4846 else if (h != NULL)
4847 tls_type = elf_x86_64_hash_entry (h)->tls_type;
4848
4849 if (! elf_x86_64_tls_transition (info, input_bfd,
4850 input_section, contents,
4851 symtab_hdr, sym_hashes,
4852 &r_type, tls_type, rel,
4853 relend, h, r_symndx))
4854 return FALSE;
4855
4856 if (r_type == R_X86_64_TPOFF32)
4857 {
4858 bfd_vma roff = rel->r_offset;
4859
4860 BFD_ASSERT (! unresolved_reloc);
4861
4862 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4863 {
4864 /* GD->LE transition. For 64bit, change
4865 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4866 .word 0x6666; rex64; call __tls_get_addr
4867 into:
4868 movq %fs:0, %rax
4869 leaq foo@tpoff(%rax), %rax
4870 For 32bit, change
4871 leaq foo@tlsgd(%rip), %rdi
4872 .word 0x6666; rex64; call __tls_get_addr
4873 into:
4874 movl %fs:0, %eax
4875 leaq foo@tpoff(%rax), %rax
4876 For largepic, change:
4877 leaq foo@tlsgd(%rip), %rdi
4878 movabsq $__tls_get_addr@pltoff, %rax
4879 addq %rbx, %rax
4880 call *%rax
4881 into:
4882 movq %fs:0, %rax
4883 leaq foo@tpoff(%rax), %rax
4884 nopw 0x0(%rax,%rax,1) */
4885 int largepic = 0;
4886 if (ABI_64_P (output_bfd)
4887 && contents[roff + 5] == (bfd_byte) '\xb8')
4888 {
4889 memcpy (contents + roff - 3,
4890 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4891 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4892 largepic = 1;
4893 }
4894 else if (ABI_64_P (output_bfd))
4895 memcpy (contents + roff - 4,
4896 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4897 16);
4898 else
4899 memcpy (contents + roff - 3,
4900 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4901 15);
4902 bfd_put_32 (output_bfd,
4903 elf_x86_64_tpoff (info, relocation),
4904 contents + roff + 8 + largepic);
4905 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4906 rel++;
4907 wrel++;
4908 continue;
4909 }
4910 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4911 {
4912 /* GDesc -> LE transition.
4913 It's originally something like:
4914 leaq x@tlsdesc(%rip), %rax
4915
4916 Change it to:
4917 movl $x@tpoff, %rax. */
4918
4919 unsigned int val, type;
4920
4921 type = bfd_get_8 (input_bfd, contents + roff - 3);
4922 val = bfd_get_8 (input_bfd, contents + roff - 1);
4923 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4924 contents + roff - 3);
4925 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4926 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4927 contents + roff - 1);
4928 bfd_put_32 (output_bfd,
4929 elf_x86_64_tpoff (info, relocation),
4930 contents + roff);
4931 continue;
4932 }
4933 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4934 {
4935 /* GDesc -> LE transition.
4936 It's originally:
4937 call *(%rax)
4938 Turn it into:
4939 xchg %ax,%ax. */
4940 bfd_put_8 (output_bfd, 0x66, contents + roff);
4941 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4942 continue;
4943 }
4944 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4945 {
4946 /* IE->LE transition:
4947 For 64bit, originally it can be one of:
4948 movq foo@gottpoff(%rip), %reg
4949 addq foo@gottpoff(%rip), %reg
4950 We change it into:
4951 movq $foo, %reg
4952 leaq foo(%reg), %reg
4953 addq $foo, %reg.
4954 For 32bit, originally it can be one of:
4955 movq foo@gottpoff(%rip), %reg
4956 addl foo@gottpoff(%rip), %reg
4957 We change it into:
4958 movq $foo, %reg
4959 leal foo(%reg), %reg
4960 addl $foo, %reg. */
4961
4962 unsigned int val, type, reg;
4963
4964 if (roff >= 3)
4965 val = bfd_get_8 (input_bfd, contents + roff - 3);
4966 else
4967 val = 0;
4968 type = bfd_get_8 (input_bfd, contents + roff - 2);
4969 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4970 reg >>= 3;
4971 if (type == 0x8b)
4972 {
4973 /* movq */
4974 if (val == 0x4c)
4975 bfd_put_8 (output_bfd, 0x49,
4976 contents + roff - 3);
4977 else if (!ABI_64_P (output_bfd) && val == 0x44)
4978 bfd_put_8 (output_bfd, 0x41,
4979 contents + roff - 3);
4980 bfd_put_8 (output_bfd, 0xc7,
4981 contents + roff - 2);
4982 bfd_put_8 (output_bfd, 0xc0 | reg,
4983 contents + roff - 1);
4984 }
4985 else if (reg == 4)
4986 {
4987 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4988 is special */
4989 if (val == 0x4c)
4990 bfd_put_8 (output_bfd, 0x49,
4991 contents + roff - 3);
4992 else if (!ABI_64_P (output_bfd) && val == 0x44)
4993 bfd_put_8 (output_bfd, 0x41,
4994 contents + roff - 3);
4995 bfd_put_8 (output_bfd, 0x81,
4996 contents + roff - 2);
4997 bfd_put_8 (output_bfd, 0xc0 | reg,
4998 contents + roff - 1);
4999 }
5000 else
5001 {
5002 /* addq/addl -> leaq/leal */
5003 if (val == 0x4c)
5004 bfd_put_8 (output_bfd, 0x4d,
5005 contents + roff - 3);
5006 else if (!ABI_64_P (output_bfd) && val == 0x44)
5007 bfd_put_8 (output_bfd, 0x45,
5008 contents + roff - 3);
5009 bfd_put_8 (output_bfd, 0x8d,
5010 contents + roff - 2);
5011 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
5012 contents + roff - 1);
5013 }
5014 bfd_put_32 (output_bfd,
5015 elf_x86_64_tpoff (info, relocation),
5016 contents + roff);
5017 continue;
5018 }
5019 else
5020 BFD_ASSERT (FALSE);
5021 }
5022
5023 if (htab->elf.sgot == NULL)
5024 abort ();
5025
5026 if (h != NULL)
5027 {
5028 off = h->got.offset;
5029 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
5030 }
5031 else
5032 {
5033 if (local_got_offsets == NULL)
5034 abort ();
5035
5036 off = local_got_offsets[r_symndx];
5037 offplt = local_tlsdesc_gotents[r_symndx];
5038 }
5039
5040 if ((off & 1) != 0)
5041 off &= ~1;
5042 else
5043 {
5044 Elf_Internal_Rela outrel;
5045 int dr_type, indx;
5046 asection *sreloc;
5047
5048 if (htab->elf.srelgot == NULL)
5049 abort ();
5050
5051 indx = h && h->dynindx != -1 ? h->dynindx : 0;
5052
5053 if (GOT_TLS_GDESC_P (tls_type))
5054 {
5055 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
5056 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
5057 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
5058 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
5059 + htab->elf.sgotplt->output_offset
5060 + offplt
5061 + htab->sgotplt_jump_table_size);
5062 sreloc = htab->elf.srelplt;
5063 if (indx == 0)
5064 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
5065 else
5066 outrel.r_addend = 0;
5067 elf_append_rela (output_bfd, sreloc, &outrel);
5068 }
5069
5070 sreloc = htab->elf.srelgot;
5071
5072 outrel.r_offset = (htab->elf.sgot->output_section->vma
5073 + htab->elf.sgot->output_offset + off);
5074
5075 if (GOT_TLS_GD_P (tls_type))
5076 dr_type = R_X86_64_DTPMOD64;
5077 else if (GOT_TLS_GDESC_P (tls_type))
5078 goto dr_done;
5079 else
5080 dr_type = R_X86_64_TPOFF64;
5081
5082 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
5083 outrel.r_addend = 0;
5084 if ((dr_type == R_X86_64_TPOFF64
5085 || dr_type == R_X86_64_TLSDESC) && indx == 0)
5086 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
5087 outrel.r_info = htab->r_info (indx, dr_type);
5088
5089 elf_append_rela (output_bfd, sreloc, &outrel);
5090
5091 if (GOT_TLS_GD_P (tls_type))
5092 {
5093 if (indx == 0)
5094 {
5095 BFD_ASSERT (! unresolved_reloc);
5096 bfd_put_64 (output_bfd,
5097 relocation - elf_x86_64_dtpoff_base (info),
5098 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5099 }
5100 else
5101 {
5102 bfd_put_64 (output_bfd, 0,
5103 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5104 outrel.r_info = htab->r_info (indx,
5105 R_X86_64_DTPOFF64);
5106 outrel.r_offset += GOT_ENTRY_SIZE;
5107 elf_append_rela (output_bfd, sreloc,
5108 &outrel);
5109 }
5110 }
5111
5112 dr_done:
5113 if (h != NULL)
5114 h->got.offset |= 1;
5115 else
5116 local_got_offsets[r_symndx] |= 1;
5117 }
5118
5119 if (off >= (bfd_vma) -2
5120 && ! GOT_TLS_GDESC_P (tls_type))
5121 abort ();
5122 if (r_type == ELF32_R_TYPE (rel->r_info))
5123 {
5124 if (r_type == R_X86_64_GOTPC32_TLSDESC
5125 || r_type == R_X86_64_TLSDESC_CALL)
5126 relocation = htab->elf.sgotplt->output_section->vma
5127 + htab->elf.sgotplt->output_offset
5128 + offplt + htab->sgotplt_jump_table_size;
5129 else
5130 relocation = htab->elf.sgot->output_section->vma
5131 + htab->elf.sgot->output_offset + off;
5132 unresolved_reloc = FALSE;
5133 }
5134 else
5135 {
5136 bfd_vma roff = rel->r_offset;
5137
5138 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
5139 {
5140 /* GD->IE transition. For 64bit, change
5141 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
5142 .word 0x6666; rex64; call __tls_get_addr@plt
5143 into:
5144 movq %fs:0, %rax
5145 addq foo@gottpoff(%rip), %rax
5146 For 32bit, change
5147 leaq foo@tlsgd(%rip), %rdi
5148 .word 0x6666; rex64; call __tls_get_addr@plt
5149 into:
5150 movl %fs:0, %eax
5151 addq foo@gottpoff(%rip), %rax
5152 For largepic, change:
5153 leaq foo@tlsgd(%rip), %rdi
5154 movabsq $__tls_get_addr@pltoff, %rax
5155 addq %rbx, %rax
5156 call *%rax
5157 into:
5158 movq %fs:0, %rax
5159 addq foo@gottpoff(%rax), %rax
5160 nopw 0x0(%rax,%rax,1) */
5161 int largepic = 0;
5162 if (ABI_64_P (output_bfd)
5163 && contents[roff + 5] == (bfd_byte) '\xb8')
5164 {
5165 memcpy (contents + roff - 3,
5166 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
5167 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
5168 largepic = 1;
5169 }
5170 else if (ABI_64_P (output_bfd))
5171 memcpy (contents + roff - 4,
5172 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5173 16);
5174 else
5175 memcpy (contents + roff - 3,
5176 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
5177 15);
5178
5179 relocation = (htab->elf.sgot->output_section->vma
5180 + htab->elf.sgot->output_offset + off
5181 - roff
5182 - largepic
5183 - input_section->output_section->vma
5184 - input_section->output_offset
5185 - 12);
5186 bfd_put_32 (output_bfd, relocation,
5187 contents + roff + 8 + largepic);
5188 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5189 rel++;
5190 wrel++;
5191 continue;
5192 }
5193 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
5194 {
5195 /* GDesc -> IE transition.
5196 It's originally something like:
5197 leaq x@tlsdesc(%rip), %rax
5198
5199 Change it to:
5200 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
5201
5202 /* Now modify the instruction as appropriate. To
5203 turn a leaq into a movq in the form we use it, it
5204 suffices to change the second byte from 0x8d to
5205 0x8b. */
5206 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
5207
5208 bfd_put_32 (output_bfd,
5209 htab->elf.sgot->output_section->vma
5210 + htab->elf.sgot->output_offset + off
5211 - rel->r_offset
5212 - input_section->output_section->vma
5213 - input_section->output_offset
5214 - 4,
5215 contents + roff);
5216 continue;
5217 }
5218 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
5219 {
5220 /* GDesc -> IE transition.
5221 It's originally:
5222 call *(%rax)
5223
5224 Change it to:
5225 xchg %ax, %ax. */
5226
5227 bfd_put_8 (output_bfd, 0x66, contents + roff);
5228 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5229 continue;
5230 }
5231 else
5232 BFD_ASSERT (FALSE);
5233 }
5234 break;
5235
5236 case R_X86_64_TLSLD:
5237 if (! elf_x86_64_tls_transition (info, input_bfd,
5238 input_section, contents,
5239 symtab_hdr, sym_hashes,
5240 &r_type, GOT_UNKNOWN,
5241 rel, relend, h, r_symndx))
5242 return FALSE;
5243
5244 if (r_type != R_X86_64_TLSLD)
5245 {
5246 /* LD->LE transition:
5247 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
5248 For 64bit, we change it into:
5249 .word 0x6666; .byte 0x66; movq %fs:0, %rax.
5250 For 32bit, we change it into:
5251 nopl 0x0(%rax); movl %fs:0, %eax.
5252 For largepic, change:
5253 leaq foo@tlsgd(%rip), %rdi
5254 movabsq $__tls_get_addr@pltoff, %rax
5255 addq %rbx, %rax
5256 call *%rax
5257 into:
5258 data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
5259 movq %fs:0, %eax */
5260
5261 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
5262 if (ABI_64_P (output_bfd)
5263 && contents[rel->r_offset + 5] == (bfd_byte) '\xb8')
5264 memcpy (contents + rel->r_offset - 3,
5265 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5266 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5267 else if (ABI_64_P (output_bfd))
5268 memcpy (contents + rel->r_offset - 3,
5269 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5270 else
5271 memcpy (contents + rel->r_offset - 3,
5272 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5273 /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
5274 rel++;
5275 wrel++;
5276 continue;
5277 }
5278
5279 if (htab->elf.sgot == NULL)
5280 abort ();
5281
5282 off = htab->tls_ld_got.offset;
5283 if (off & 1)
5284 off &= ~1;
5285 else
5286 {
5287 Elf_Internal_Rela outrel;
5288
5289 if (htab->elf.srelgot == NULL)
5290 abort ();
5291
5292 outrel.r_offset = (htab->elf.sgot->output_section->vma
5293 + htab->elf.sgot->output_offset + off);
5294
5295 bfd_put_64 (output_bfd, 0,
5296 htab->elf.sgot->contents + off);
5297 bfd_put_64 (output_bfd, 0,
5298 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5299 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
5300 outrel.r_addend = 0;
5301 elf_append_rela (output_bfd, htab->elf.srelgot,
5302 &outrel);
5303 htab->tls_ld_got.offset |= 1;
5304 }
5305 relocation = htab->elf.sgot->output_section->vma
5306 + htab->elf.sgot->output_offset + off;
5307 unresolved_reloc = FALSE;
5308 break;
5309
5310 case R_X86_64_DTPOFF32:
5311 if (!bfd_link_executable (info)
5312 || (input_section->flags & SEC_CODE) == 0)
5313 relocation -= elf_x86_64_dtpoff_base (info);
5314 else
5315 relocation = elf_x86_64_tpoff (info, relocation);
5316 break;
5317
5318 case R_X86_64_TPOFF32:
5319 case R_X86_64_TPOFF64:
5320 BFD_ASSERT (bfd_link_executable (info));
5321 relocation = elf_x86_64_tpoff (info, relocation);
5322 break;
5323
5324 case R_X86_64_DTPOFF64:
5325 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
5326 relocation -= elf_x86_64_dtpoff_base (info);
5327 break;
5328
5329 default:
5330 break;
5331 }
5332
5333 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5334 because such sections are not SEC_ALLOC and thus ld.so will
5335 not process them. */
5336 if (unresolved_reloc
5337 && !((input_section->flags & SEC_DEBUGGING) != 0
5338 && h->def_dynamic)
5339 && _bfd_elf_section_offset (output_bfd, info, input_section,
5340 rel->r_offset) != (bfd_vma) -1)
5341 {
5342 (*_bfd_error_handler)
5343 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5344 input_bfd,
5345 input_section,
5346 (long) rel->r_offset,
5347 howto->name,
5348 h->root.root.string);
5349 return FALSE;
5350 }
5351
5352 do_relocation:
5353 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5354 contents, rel->r_offset,
5355 relocation, rel->r_addend);
5356
5357 check_relocation_error:
5358 if (r != bfd_reloc_ok)
5359 {
5360 const char *name;
5361
5362 if (h != NULL)
5363 name = h->root.root.string;
5364 else
5365 {
5366 name = bfd_elf_string_from_elf_section (input_bfd,
5367 symtab_hdr->sh_link,
5368 sym->st_name);
5369 if (name == NULL)
5370 return FALSE;
5371 if (*name == '\0')
5372 name = bfd_section_name (input_bfd, sec);
5373 }
5374
5375 if (r == bfd_reloc_overflow)
5376 {
5377 if (! ((*info->callbacks->reloc_overflow)
5378 (info, (h ? &h->root : NULL), name, howto->name,
5379 (bfd_vma) 0, input_bfd, input_section,
5380 rel->r_offset)))
5381 return FALSE;
5382 }
5383 else
5384 {
5385 (*_bfd_error_handler)
5386 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5387 input_bfd, input_section,
5388 (long) rel->r_offset, name, (int) r);
5389 return FALSE;
5390 }
5391 }
5392
5393 if (wrel != rel)
5394 *wrel = *rel;
5395 }
5396
5397 if (wrel != rel)
5398 {
5399 Elf_Internal_Shdr *rel_hdr;
5400 size_t deleted = rel - wrel;
5401
5402 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5403 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5404 if (rel_hdr->sh_size == 0)
5405 {
5406 /* It is too late to remove an empty reloc section. Leave
5407 one NONE reloc.
5408 ??? What is wrong with an empty section??? */
5409 rel_hdr->sh_size = rel_hdr->sh_entsize;
5410 deleted -= 1;
5411 }
5412 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5413 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5414 input_section->reloc_count -= deleted;
5415 }
5416
5417 return TRUE;
5418 }
5419
5420 /* Finish up dynamic symbol handling. We set the contents of various
5421 dynamic sections here. */
5422
5423 static bfd_boolean
5424 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
5425 struct bfd_link_info *info,
5426 struct elf_link_hash_entry *h,
5427 Elf_Internal_Sym *sym)
5428 {
5429 struct elf_x86_64_link_hash_table *htab;
5430 const struct elf_x86_64_backend_data *abed;
5431 bfd_boolean use_plt_bnd;
5432 struct elf_x86_64_link_hash_entry *eh;
5433 bfd_boolean local_undefweak;
5434
5435 htab = elf_x86_64_hash_table (info);
5436 if (htab == NULL)
5437 return FALSE;
5438
5439 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5440 section only if there is .plt section. */
5441 use_plt_bnd = htab->elf.splt != NULL && htab->plt_bnd != NULL;
5442 abed = (use_plt_bnd
5443 ? &elf_x86_64_bnd_arch_bed
5444 : get_elf_x86_64_backend_data (output_bfd));
5445
5446 eh = (struct elf_x86_64_link_hash_entry *) h;
5447
5448 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5449 resolved undefined weak symbols in executable so that their
5450 references have value 0 at run-time. */
5451 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
5452
5453 if (h->plt.offset != (bfd_vma) -1)
5454 {
5455 bfd_vma plt_index;
5456 bfd_vma got_offset, plt_offset, plt_plt_offset, plt_got_offset;
5457 bfd_vma plt_plt_insn_end, plt_got_insn_size;
5458 Elf_Internal_Rela rela;
5459 bfd_byte *loc;
5460 asection *plt, *gotplt, *relplt, *resolved_plt;
5461 const struct elf_backend_data *bed;
5462 bfd_vma plt_got_pcrel_offset;
5463
5464 /* When building a static executable, use .iplt, .igot.plt and
5465 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5466 if (htab->elf.splt != NULL)
5467 {
5468 plt = htab->elf.splt;
5469 gotplt = htab->elf.sgotplt;
5470 relplt = htab->elf.srelplt;
5471 }
5472 else
5473 {
5474 plt = htab->elf.iplt;
5475 gotplt = htab->elf.igotplt;
5476 relplt = htab->elf.irelplt;
5477 }
5478
5479 /* This symbol has an entry in the procedure linkage table. Set
5480 it up. */
5481 if ((h->dynindx == -1
5482 && !local_undefweak
5483 && !((h->forced_local || bfd_link_executable (info))
5484 && h->def_regular
5485 && h->type == STT_GNU_IFUNC))
5486 || plt == NULL
5487 || gotplt == NULL
5488 || relplt == NULL)
5489 abort ();
5490
5491 /* Get the index in the procedure linkage table which
5492 corresponds to this symbol. This is the index of this symbol
5493 in all the symbols for which we are making plt entries. The
5494 first entry in the procedure linkage table is reserved.
5495
5496 Get the offset into the .got table of the entry that
5497 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5498 bytes. The first three are reserved for the dynamic linker.
5499
5500 For static executables, we don't reserve anything. */
5501
5502 if (plt == htab->elf.splt)
5503 {
5504 got_offset = h->plt.offset / abed->plt_entry_size - 1;
5505 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
5506 }
5507 else
5508 {
5509 got_offset = h->plt.offset / abed->plt_entry_size;
5510 got_offset = got_offset * GOT_ENTRY_SIZE;
5511 }
5512
5513 plt_plt_insn_end = abed->plt_plt_insn_end;
5514 plt_plt_offset = abed->plt_plt_offset;
5515 plt_got_insn_size = abed->plt_got_insn_size;
5516 plt_got_offset = abed->plt_got_offset;
5517 if (use_plt_bnd)
5518 {
5519 /* Use the second PLT with BND relocations. */
5520 const bfd_byte *plt_entry, *plt2_entry;
5521
5522 if (eh->has_bnd_reloc)
5523 {
5524 plt_entry = elf_x86_64_bnd_plt_entry;
5525 plt2_entry = elf_x86_64_bnd_plt2_entry;
5526 }
5527 else
5528 {
5529 plt_entry = elf_x86_64_legacy_plt_entry;
5530 plt2_entry = elf_x86_64_legacy_plt2_entry;
5531
5532 /* Subtract 1 since there is no BND prefix. */
5533 plt_plt_insn_end -= 1;
5534 plt_plt_offset -= 1;
5535 plt_got_insn_size -= 1;
5536 plt_got_offset -= 1;
5537 }
5538
5539 BFD_ASSERT (sizeof (elf_x86_64_bnd_plt_entry)
5540 == sizeof (elf_x86_64_legacy_plt_entry));
5541
5542 /* Fill in the entry in the procedure linkage table. */
5543 memcpy (plt->contents + h->plt.offset,
5544 plt_entry, sizeof (elf_x86_64_legacy_plt_entry));
5545 /* Fill in the entry in the second PLT. */
5546 memcpy (htab->plt_bnd->contents + eh->plt_bnd.offset,
5547 plt2_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5548
5549 resolved_plt = htab->plt_bnd;
5550 plt_offset = eh->plt_bnd.offset;
5551 }
5552 else
5553 {
5554 /* Fill in the entry in the procedure linkage table. */
5555 memcpy (plt->contents + h->plt.offset, abed->plt_entry,
5556 abed->plt_entry_size);
5557
5558 resolved_plt = plt;
5559 plt_offset = h->plt.offset;
5560 }
5561
5562 /* Insert the relocation positions of the plt section. */
5563
5564 /* Put offset the PC-relative instruction referring to the GOT entry,
5565 subtracting the size of that instruction. */
5566 plt_got_pcrel_offset = (gotplt->output_section->vma
5567 + gotplt->output_offset
5568 + got_offset
5569 - resolved_plt->output_section->vma
5570 - resolved_plt->output_offset
5571 - plt_offset
5572 - plt_got_insn_size);
5573
5574 /* Check PC-relative offset overflow in PLT entry. */
5575 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5576 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5577 output_bfd, h->root.root.string);
5578
5579 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5580 resolved_plt->contents + plt_offset + plt_got_offset);
5581
5582 /* Fill in the entry in the global offset table, initially this
5583 points to the second part of the PLT entry. Leave the entry
5584 as zero for undefined weak symbol in PIE. No PLT relocation
5585 against undefined weak symbol in PIE. */
5586 if (!local_undefweak)
5587 {
5588 bfd_put_64 (output_bfd, (plt->output_section->vma
5589 + plt->output_offset
5590 + h->plt.offset
5591 + abed->plt_lazy_offset),
5592 gotplt->contents + got_offset);
5593
5594 /* Fill in the entry in the .rela.plt section. */
5595 rela.r_offset = (gotplt->output_section->vma
5596 + gotplt->output_offset
5597 + got_offset);
5598 if (h->dynindx == -1
5599 || ((bfd_link_executable (info)
5600 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5601 && h->def_regular
5602 && h->type == STT_GNU_IFUNC))
5603 {
5604 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5605 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5606 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5607 rela.r_addend = (h->root.u.def.value
5608 + h->root.u.def.section->output_section->vma
5609 + h->root.u.def.section->output_offset);
5610 /* R_X86_64_IRELATIVE comes last. */
5611 plt_index = htab->next_irelative_index--;
5612 }
5613 else
5614 {
5615 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5616 rela.r_addend = 0;
5617 plt_index = htab->next_jump_slot_index++;
5618 }
5619
5620 /* Don't fill PLT entry for static executables. */
5621 if (plt == htab->elf.splt)
5622 {
5623 bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
5624
5625 /* Put relocation index. */
5626 bfd_put_32 (output_bfd, plt_index,
5627 (plt->contents + h->plt.offset
5628 + abed->plt_reloc_offset));
5629
5630 /* Put offset for jmp .PLT0 and check for overflow. We don't
5631 check relocation index for overflow since branch displacement
5632 will overflow first. */
5633 if (plt0_offset > 0x80000000)
5634 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5635 output_bfd, h->root.root.string);
5636 bfd_put_32 (output_bfd, - plt0_offset,
5637 plt->contents + h->plt.offset + plt_plt_offset);
5638 }
5639
5640 bed = get_elf_backend_data (output_bfd);
5641 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5642 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5643 }
5644 }
5645 else if (eh->plt_got.offset != (bfd_vma) -1)
5646 {
5647 bfd_vma got_offset, plt_offset, plt_got_offset, plt_got_insn_size;
5648 asection *plt, *got;
5649 bfd_boolean got_after_plt;
5650 int32_t got_pcrel_offset;
5651 const bfd_byte *got_plt_entry;
5652
5653 /* Set the entry in the GOT procedure linkage table. */
5654 plt = htab->plt_got;
5655 got = htab->elf.sgot;
5656 got_offset = h->got.offset;
5657
5658 if (got_offset == (bfd_vma) -1
5659 || h->type == STT_GNU_IFUNC
5660 || plt == NULL
5661 || got == NULL)
5662 abort ();
5663
5664 /* Use the second PLT entry template for the GOT PLT since they
5665 are the identical. */
5666 plt_got_insn_size = elf_x86_64_bnd_arch_bed.plt_got_insn_size;
5667 plt_got_offset = elf_x86_64_bnd_arch_bed.plt_got_offset;
5668 if (eh->has_bnd_reloc)
5669 got_plt_entry = elf_x86_64_bnd_plt2_entry;
5670 else
5671 {
5672 got_plt_entry = elf_x86_64_legacy_plt2_entry;
5673
5674 /* Subtract 1 since there is no BND prefix. */
5675 plt_got_insn_size -= 1;
5676 plt_got_offset -= 1;
5677 }
5678
5679 /* Fill in the entry in the GOT procedure linkage table. */
5680 plt_offset = eh->plt_got.offset;
5681 memcpy (plt->contents + plt_offset,
5682 got_plt_entry, sizeof (elf_x86_64_legacy_plt2_entry));
5683
5684 /* Put offset the PC-relative instruction referring to the GOT
5685 entry, subtracting the size of that instruction. */
5686 got_pcrel_offset = (got->output_section->vma
5687 + got->output_offset
5688 + got_offset
5689 - plt->output_section->vma
5690 - plt->output_offset
5691 - plt_offset
5692 - plt_got_insn_size);
5693
5694 /* Check PC-relative offset overflow in GOT PLT entry. */
5695 got_after_plt = got->output_section->vma > plt->output_section->vma;
5696 if ((got_after_plt && got_pcrel_offset < 0)
5697 || (!got_after_plt && got_pcrel_offset > 0))
5698 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5699 output_bfd, h->root.root.string);
5700
5701 bfd_put_32 (output_bfd, got_pcrel_offset,
5702 plt->contents + plt_offset + plt_got_offset);
5703 }
5704
5705 if (!local_undefweak
5706 && !h->def_regular
5707 && (h->plt.offset != (bfd_vma) -1
5708 || eh->plt_got.offset != (bfd_vma) -1))
5709 {
5710 /* Mark the symbol as undefined, rather than as defined in
5711 the .plt section. Leave the value if there were any
5712 relocations where pointer equality matters (this is a clue
5713 for the dynamic linker, to make function pointer
5714 comparisons work between an application and shared
5715 library), otherwise set it to zero. If a function is only
5716 called from a binary, there is no need to slow down
5717 shared libraries because of that. */
5718 sym->st_shndx = SHN_UNDEF;
5719 if (!h->pointer_equality_needed)
5720 sym->st_value = 0;
5721 }
5722
5723 /* Don't generate dynamic GOT relocation against undefined weak
5724 symbol in executable. */
5725 if (h->got.offset != (bfd_vma) -1
5726 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
5727 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE
5728 && !local_undefweak)
5729 {
5730 Elf_Internal_Rela rela;
5731
5732 /* This symbol has an entry in the global offset table. Set it
5733 up. */
5734 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5735 abort ();
5736
5737 rela.r_offset = (htab->elf.sgot->output_section->vma
5738 + htab->elf.sgot->output_offset
5739 + (h->got.offset &~ (bfd_vma) 1));
5740
5741 /* If this is a static link, or it is a -Bsymbolic link and the
5742 symbol is defined locally or was forced to be local because
5743 of a version file, we just want to emit a RELATIVE reloc.
5744 The entry in the global offset table will already have been
5745 initialized in the relocate_section function. */
5746 if (h->def_regular
5747 && h->type == STT_GNU_IFUNC)
5748 {
5749 if (bfd_link_pic (info))
5750 {
5751 /* Generate R_X86_64_GLOB_DAT. */
5752 goto do_glob_dat;
5753 }
5754 else
5755 {
5756 asection *plt;
5757
5758 if (!h->pointer_equality_needed)
5759 abort ();
5760
5761 /* For non-shared object, we can't use .got.plt, which
5762 contains the real function addres if we need pointer
5763 equality. We load the GOT entry with the PLT entry. */
5764 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5765 bfd_put_64 (output_bfd, (plt->output_section->vma
5766 + plt->output_offset
5767 + h->plt.offset),
5768 htab->elf.sgot->contents + h->got.offset);
5769 return TRUE;
5770 }
5771 }
5772 else if (bfd_link_pic (info)
5773 && SYMBOL_REFERENCES_LOCAL (info, h))
5774 {
5775 if (!h->def_regular)
5776 return FALSE;
5777 BFD_ASSERT((h->got.offset & 1) != 0);
5778 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5779 rela.r_addend = (h->root.u.def.value
5780 + h->root.u.def.section->output_section->vma
5781 + h->root.u.def.section->output_offset);
5782 }
5783 else
5784 {
5785 BFD_ASSERT((h->got.offset & 1) == 0);
5786 do_glob_dat:
5787 bfd_put_64 (output_bfd, (bfd_vma) 0,
5788 htab->elf.sgot->contents + h->got.offset);
5789 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5790 rela.r_addend = 0;
5791 }
5792
5793 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
5794 }
5795
5796 if (h->needs_copy)
5797 {
5798 Elf_Internal_Rela rela;
5799
5800 /* This symbol needs a copy reloc. Set it up. */
5801
5802 if (h->dynindx == -1
5803 || (h->root.type != bfd_link_hash_defined
5804 && h->root.type != bfd_link_hash_defweak)
5805 || htab->srelbss == NULL)
5806 abort ();
5807
5808 rela.r_offset = (h->root.u.def.value
5809 + h->root.u.def.section->output_section->vma
5810 + h->root.u.def.section->output_offset);
5811 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5812 rela.r_addend = 0;
5813 elf_append_rela (output_bfd, htab->srelbss, &rela);
5814 }
5815
5816 return TRUE;
5817 }
5818
5819 /* Finish up local dynamic symbol handling. We set the contents of
5820 various dynamic sections here. */
5821
5822 static bfd_boolean
5823 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5824 {
5825 struct elf_link_hash_entry *h
5826 = (struct elf_link_hash_entry *) *slot;
5827 struct bfd_link_info *info
5828 = (struct bfd_link_info *) inf;
5829
5830 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5831 info, h, NULL);
5832 }
5833
5834 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5835 here since undefined weak symbol may not be dynamic and may not be
5836 called for elf_x86_64_finish_dynamic_symbol. */
5837
5838 static bfd_boolean
5839 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5840 void *inf)
5841 {
5842 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5843 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5844
5845 if (h->root.type != bfd_link_hash_undefweak
5846 || h->dynindx != -1)
5847 return TRUE;
5848
5849 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5850 info, h, NULL);
5851 }
5852
5853 /* Used to decide how to sort relocs in an optimal manner for the
5854 dynamic linker, before writing them out. */
5855
5856 static enum elf_reloc_type_class
5857 elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
5858 const asection *rel_sec ATTRIBUTE_UNUSED,
5859 const Elf_Internal_Rela *rela)
5860 {
5861 bfd *abfd = info->output_bfd;
5862 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5863 struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
5864
5865 if (htab->elf.dynsym != NULL
5866 && htab->elf.dynsym->contents != NULL)
5867 {
5868 /* Check relocation against STT_GNU_IFUNC symbol if there are
5869 dynamic symbols. */
5870 unsigned long r_symndx = htab->r_sym (rela->r_info);
5871 Elf_Internal_Sym sym;
5872 if (!bed->s->swap_symbol_in (abfd,
5873 (htab->elf.dynsym->contents
5874 + r_symndx * bed->s->sizeof_sym),
5875 0, &sym))
5876 abort ();
5877
5878 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5879 return reloc_class_ifunc;
5880 }
5881
5882 switch ((int) ELF32_R_TYPE (rela->r_info))
5883 {
5884 case R_X86_64_RELATIVE:
5885 case R_X86_64_RELATIVE64:
5886 return reloc_class_relative;
5887 case R_X86_64_JUMP_SLOT:
5888 return reloc_class_plt;
5889 case R_X86_64_COPY:
5890 return reloc_class_copy;
5891 default:
5892 return reloc_class_normal;
5893 }
5894 }
5895
5896 /* Finish up the dynamic sections. */
5897
5898 static bfd_boolean
5899 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5900 struct bfd_link_info *info)
5901 {
5902 struct elf_x86_64_link_hash_table *htab;
5903 bfd *dynobj;
5904 asection *sdyn;
5905 const struct elf_x86_64_backend_data *abed;
5906
5907 htab = elf_x86_64_hash_table (info);
5908 if (htab == NULL)
5909 return FALSE;
5910
5911 /* Use MPX backend data in case of BND relocation. Use .plt_bnd
5912 section only if there is .plt section. */
5913 abed = (htab->elf.splt != NULL && htab->plt_bnd != NULL
5914 ? &elf_x86_64_bnd_arch_bed
5915 : get_elf_x86_64_backend_data (output_bfd));
5916
5917 dynobj = htab->elf.dynobj;
5918 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5919
5920 if (htab->elf.dynamic_sections_created)
5921 {
5922 bfd_byte *dyncon, *dynconend;
5923 const struct elf_backend_data *bed;
5924 bfd_size_type sizeof_dyn;
5925
5926 if (sdyn == NULL || htab->elf.sgot == NULL)
5927 abort ();
5928
5929 bed = get_elf_backend_data (dynobj);
5930 sizeof_dyn = bed->s->sizeof_dyn;
5931 dyncon = sdyn->contents;
5932 dynconend = sdyn->contents + sdyn->size;
5933 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5934 {
5935 Elf_Internal_Dyn dyn;
5936 asection *s;
5937
5938 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5939
5940 switch (dyn.d_tag)
5941 {
5942 default:
5943 continue;
5944
5945 case DT_PLTGOT:
5946 s = htab->elf.sgotplt;
5947 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5948 break;
5949
5950 case DT_JMPREL:
5951 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5952 break;
5953
5954 case DT_PLTRELSZ:
5955 s = htab->elf.srelplt->output_section;
5956 dyn.d_un.d_val = s->size;
5957 break;
5958
5959 case DT_RELASZ:
5960 /* The procedure linkage table relocs (DT_JMPREL) should
5961 not be included in the overall relocs (DT_RELA).
5962 Therefore, we override the DT_RELASZ entry here to
5963 make it not include the JMPREL relocs. Since the
5964 linker script arranges for .rela.plt to follow all
5965 other relocation sections, we don't have to worry
5966 about changing the DT_RELA entry. */
5967 if (htab->elf.srelplt != NULL)
5968 {
5969 s = htab->elf.srelplt->output_section;
5970 dyn.d_un.d_val -= s->size;
5971 }
5972 break;
5973
5974 case DT_TLSDESC_PLT:
5975 s = htab->elf.splt;
5976 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5977 + htab->tlsdesc_plt;
5978 break;
5979
5980 case DT_TLSDESC_GOT:
5981 s = htab->elf.sgot;
5982 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5983 + htab->tlsdesc_got;
5984 break;
5985 }
5986
5987 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5988 }
5989
5990 /* Fill in the special first entry in the procedure linkage table. */
5991 if (htab->elf.splt && htab->elf.splt->size > 0)
5992 {
5993 /* Fill in the first entry in the procedure linkage table. */
5994 memcpy (htab->elf.splt->contents,
5995 abed->plt0_entry, abed->plt_entry_size);
5996 /* Add offset for pushq GOT+8(%rip), since the instruction
5997 uses 6 bytes subtract this value. */
5998 bfd_put_32 (output_bfd,
5999 (htab->elf.sgotplt->output_section->vma
6000 + htab->elf.sgotplt->output_offset
6001 + 8
6002 - htab->elf.splt->output_section->vma
6003 - htab->elf.splt->output_offset
6004 - 6),
6005 htab->elf.splt->contents + abed->plt0_got1_offset);
6006 /* Add offset for the PC-relative instruction accessing GOT+16,
6007 subtracting the offset to the end of that instruction. */
6008 bfd_put_32 (output_bfd,
6009 (htab->elf.sgotplt->output_section->vma
6010 + htab->elf.sgotplt->output_offset
6011 + 16
6012 - htab->elf.splt->output_section->vma
6013 - htab->elf.splt->output_offset
6014 - abed->plt0_got2_insn_end),
6015 htab->elf.splt->contents + abed->plt0_got2_offset);
6016
6017 elf_section_data (htab->elf.splt->output_section)
6018 ->this_hdr.sh_entsize = abed->plt_entry_size;
6019
6020 if (htab->tlsdesc_plt)
6021 {
6022 bfd_put_64 (output_bfd, (bfd_vma) 0,
6023 htab->elf.sgot->contents + htab->tlsdesc_got);
6024
6025 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
6026 abed->plt0_entry, abed->plt_entry_size);
6027
6028 /* Add offset for pushq GOT+8(%rip), since the
6029 instruction uses 6 bytes subtract this value. */
6030 bfd_put_32 (output_bfd,
6031 (htab->elf.sgotplt->output_section->vma
6032 + htab->elf.sgotplt->output_offset
6033 + 8
6034 - htab->elf.splt->output_section->vma
6035 - htab->elf.splt->output_offset
6036 - htab->tlsdesc_plt
6037 - 6),
6038 htab->elf.splt->contents
6039 + htab->tlsdesc_plt + abed->plt0_got1_offset);
6040 /* Add offset for the PC-relative instruction accessing GOT+TDG,
6041 where TGD stands for htab->tlsdesc_got, subtracting the offset
6042 to the end of that instruction. */
6043 bfd_put_32 (output_bfd,
6044 (htab->elf.sgot->output_section->vma
6045 + htab->elf.sgot->output_offset
6046 + htab->tlsdesc_got
6047 - htab->elf.splt->output_section->vma
6048 - htab->elf.splt->output_offset
6049 - htab->tlsdesc_plt
6050 - abed->plt0_got2_insn_end),
6051 htab->elf.splt->contents
6052 + htab->tlsdesc_plt + abed->plt0_got2_offset);
6053 }
6054 }
6055 }
6056
6057 if (htab->plt_bnd != NULL)
6058 elf_section_data (htab->plt_bnd->output_section)
6059 ->this_hdr.sh_entsize = sizeof (elf_x86_64_bnd_plt2_entry);
6060
6061 if (htab->elf.sgotplt)
6062 {
6063 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
6064 {
6065 (*_bfd_error_handler)
6066 (_("discarded output section: `%A'"), htab->elf.sgotplt);
6067 return FALSE;
6068 }
6069
6070 /* Fill in the first three entries in the global offset table. */
6071 if (htab->elf.sgotplt->size > 0)
6072 {
6073 /* Set the first entry in the global offset table to the address of
6074 the dynamic section. */
6075 if (sdyn == NULL)
6076 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
6077 else
6078 bfd_put_64 (output_bfd,
6079 sdyn->output_section->vma + sdyn->output_offset,
6080 htab->elf.sgotplt->contents);
6081 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
6082 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
6083 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
6084 }
6085
6086 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
6087 GOT_ENTRY_SIZE;
6088 }
6089
6090 /* Adjust .eh_frame for .plt section. */
6091 if (htab->plt_eh_frame != NULL
6092 && htab->plt_eh_frame->contents != NULL)
6093 {
6094 if (htab->elf.splt != NULL
6095 && htab->elf.splt->size != 0
6096 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
6097 && htab->elf.splt->output_section != NULL
6098 && htab->plt_eh_frame->output_section != NULL)
6099 {
6100 bfd_vma plt_start = htab->elf.splt->output_section->vma;
6101 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
6102 + htab->plt_eh_frame->output_offset
6103 + PLT_FDE_START_OFFSET;
6104 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6105 htab->plt_eh_frame->contents
6106 + PLT_FDE_START_OFFSET);
6107 }
6108 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
6109 {
6110 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6111 htab->plt_eh_frame,
6112 htab->plt_eh_frame->contents))
6113 return FALSE;
6114 }
6115 }
6116
6117 if (htab->elf.sgot && htab->elf.sgot->size > 0)
6118 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
6119 = GOT_ENTRY_SIZE;
6120
6121 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
6122 htab_traverse (htab->loc_hash_table,
6123 elf_x86_64_finish_local_dynamic_symbol,
6124 info);
6125
6126 /* Fill PLT entries for undefined weak symbols in PIE. */
6127 if (bfd_link_pie (info))
6128 bfd_hash_traverse (&info->hash->table,
6129 elf_x86_64_pie_finish_undefweak_symbol,
6130 info);
6131
6132 return TRUE;
6133 }
6134
6135 /* Return an array of PLT entry symbol values. */
6136
6137 static bfd_vma *
6138 elf_x86_64_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
6139 asection *relplt)
6140 {
6141 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
6142 arelent *p;
6143 long count, i;
6144 bfd_vma *plt_sym_val;
6145 bfd_vma plt_offset;
6146 bfd_byte *plt_contents;
6147 const struct elf_x86_64_backend_data *bed;
6148 Elf_Internal_Shdr *hdr;
6149 asection *plt_bnd;
6150
6151 /* Get the .plt section contents. PLT passed down may point to the
6152 .plt.bnd section. Make sure that PLT always points to the .plt
6153 section. */
6154 plt_bnd = bfd_get_section_by_name (abfd, ".plt.bnd");
6155 if (plt_bnd)
6156 {
6157 if (plt != plt_bnd)
6158 abort ();
6159 plt = bfd_get_section_by_name (abfd, ".plt");
6160 if (plt == NULL)
6161 abort ();
6162 bed = &elf_x86_64_bnd_arch_bed;
6163 }
6164 else
6165 bed = get_elf_x86_64_backend_data (abfd);
6166
6167 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
6168 if (plt_contents == NULL)
6169 return NULL;
6170 if (!bfd_get_section_contents (abfd, (asection *) plt,
6171 plt_contents, 0, plt->size))
6172 {
6173 bad_return:
6174 free (plt_contents);
6175 return NULL;
6176 }
6177
6178 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
6179 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
6180 goto bad_return;
6181
6182 hdr = &elf_section_data (relplt)->this_hdr;
6183 count = relplt->size / hdr->sh_entsize;
6184
6185 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
6186 if (plt_sym_val == NULL)
6187 goto bad_return;
6188
6189 for (i = 0; i < count; i++)
6190 plt_sym_val[i] = -1;
6191
6192 plt_offset = bed->plt_entry_size;
6193 p = relplt->relocation;
6194 for (i = 0; i < count; i++, p++)
6195 {
6196 long reloc_index;
6197
6198 /* Skip unknown relocation. */
6199 if (p->howto == NULL)
6200 continue;
6201
6202 if (p->howto->type != R_X86_64_JUMP_SLOT
6203 && p->howto->type != R_X86_64_IRELATIVE)
6204 continue;
6205
6206 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
6207 + bed->plt_reloc_offset));
6208 if (reloc_index < count)
6209 {
6210 if (plt_bnd)
6211 {
6212 /* This is the index in .plt section. */
6213 long plt_index = plt_offset / bed->plt_entry_size;
6214 /* Store VMA + the offset in .plt.bnd section. */
6215 plt_sym_val[reloc_index] =
6216 (plt_bnd->vma
6217 + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
6218 }
6219 else
6220 plt_sym_val[reloc_index] = plt->vma + plt_offset;
6221 }
6222 plt_offset += bed->plt_entry_size;
6223
6224 /* PR binutils/18437: Skip extra relocations in the .rela.plt
6225 section. */
6226 if (plt_offset >= plt->size)
6227 break;
6228 }
6229
6230 free (plt_contents);
6231
6232 return plt_sym_val;
6233 }
6234
6235 /* Similar to _bfd_elf_get_synthetic_symtab, with .plt.bnd section
6236 support. */
6237
6238 static long
6239 elf_x86_64_get_synthetic_symtab (bfd *abfd,
6240 long symcount,
6241 asymbol **syms,
6242 long dynsymcount,
6243 asymbol **dynsyms,
6244 asymbol **ret)
6245 {
6246 /* Pass the .plt.bnd section to _bfd_elf_ifunc_get_synthetic_symtab
6247 as PLT if it exists. */
6248 asection *plt = bfd_get_section_by_name (abfd, ".plt.bnd");
6249 if (plt == NULL)
6250 plt = bfd_get_section_by_name (abfd, ".plt");
6251 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
6252 dynsymcount, dynsyms, ret,
6253 plt,
6254 elf_x86_64_get_plt_sym_val);
6255 }
6256
6257 /* Handle an x86-64 specific section when reading an object file. This
6258 is called when elfcode.h finds a section with an unknown type. */
6259
6260 static bfd_boolean
6261 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
6262 const char *name, int shindex)
6263 {
6264 if (hdr->sh_type != SHT_X86_64_UNWIND)
6265 return FALSE;
6266
6267 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
6268 return FALSE;
6269
6270 return TRUE;
6271 }
6272
6273 /* Hook called by the linker routine which adds symbols from an object
6274 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6275 of .bss. */
6276
6277 static bfd_boolean
6278 elf_x86_64_add_symbol_hook (bfd *abfd,
6279 struct bfd_link_info *info,
6280 Elf_Internal_Sym *sym,
6281 const char **namep ATTRIBUTE_UNUSED,
6282 flagword *flagsp ATTRIBUTE_UNUSED,
6283 asection **secp,
6284 bfd_vma *valp)
6285 {
6286 asection *lcomm;
6287
6288 switch (sym->st_shndx)
6289 {
6290 case SHN_X86_64_LCOMMON:
6291 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
6292 if (lcomm == NULL)
6293 {
6294 lcomm = bfd_make_section_with_flags (abfd,
6295 "LARGE_COMMON",
6296 (SEC_ALLOC
6297 | SEC_IS_COMMON
6298 | SEC_LINKER_CREATED));
6299 if (lcomm == NULL)
6300 return FALSE;
6301 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
6302 }
6303 *secp = lcomm;
6304 *valp = sym->st_size;
6305 return TRUE;
6306 }
6307
6308 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
6309 && (abfd->flags & DYNAMIC) == 0
6310 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
6311 elf_tdata (info->output_bfd)->has_gnu_symbols
6312 |= elf_gnu_symbol_unique;
6313
6314 return TRUE;
6315 }
6316
6317
6318 /* Given a BFD section, try to locate the corresponding ELF section
6319 index. */
6320
6321 static bfd_boolean
6322 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
6323 asection *sec, int *index_return)
6324 {
6325 if (sec == &_bfd_elf_large_com_section)
6326 {
6327 *index_return = SHN_X86_64_LCOMMON;
6328 return TRUE;
6329 }
6330 return FALSE;
6331 }
6332
6333 /* Process a symbol. */
6334
6335 static void
6336 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
6337 asymbol *asym)
6338 {
6339 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
6340
6341 switch (elfsym->internal_elf_sym.st_shndx)
6342 {
6343 case SHN_X86_64_LCOMMON:
6344 asym->section = &_bfd_elf_large_com_section;
6345 asym->value = elfsym->internal_elf_sym.st_size;
6346 /* Common symbol doesn't set BSF_GLOBAL. */
6347 asym->flags &= ~BSF_GLOBAL;
6348 break;
6349 }
6350 }
6351
6352 static bfd_boolean
6353 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
6354 {
6355 return (sym->st_shndx == SHN_COMMON
6356 || sym->st_shndx == SHN_X86_64_LCOMMON);
6357 }
6358
6359 static unsigned int
6360 elf_x86_64_common_section_index (asection *sec)
6361 {
6362 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6363 return SHN_COMMON;
6364 else
6365 return SHN_X86_64_LCOMMON;
6366 }
6367
6368 static asection *
6369 elf_x86_64_common_section (asection *sec)
6370 {
6371 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6372 return bfd_com_section_ptr;
6373 else
6374 return &_bfd_elf_large_com_section;
6375 }
6376
6377 static bfd_boolean
6378 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
6379 const Elf_Internal_Sym *sym,
6380 asection **psec,
6381 bfd_boolean newdef,
6382 bfd_boolean olddef,
6383 bfd *oldbfd,
6384 const asection *oldsec)
6385 {
6386 /* A normal common symbol and a large common symbol result in a
6387 normal common symbol. We turn the large common symbol into a
6388 normal one. */
6389 if (!olddef
6390 && h->root.type == bfd_link_hash_common
6391 && !newdef
6392 && bfd_is_com_section (*psec)
6393 && oldsec != *psec)
6394 {
6395 if (sym->st_shndx == SHN_COMMON
6396 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
6397 {
6398 h->root.u.c.p->section
6399 = bfd_make_section_old_way (oldbfd, "COMMON");
6400 h->root.u.c.p->section->flags = SEC_ALLOC;
6401 }
6402 else if (sym->st_shndx == SHN_X86_64_LCOMMON
6403 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
6404 *psec = bfd_com_section_ptr;
6405 }
6406
6407 return TRUE;
6408 }
6409
6410 static int
6411 elf_x86_64_additional_program_headers (bfd *abfd,
6412 struct bfd_link_info *info ATTRIBUTE_UNUSED)
6413 {
6414 asection *s;
6415 int count = 0;
6416
6417 /* Check to see if we need a large readonly segment. */
6418 s = bfd_get_section_by_name (abfd, ".lrodata");
6419 if (s && (s->flags & SEC_LOAD))
6420 count++;
6421
6422 /* Check to see if we need a large data segment. Since .lbss sections
6423 is placed right after the .bss section, there should be no need for
6424 a large data segment just because of .lbss. */
6425 s = bfd_get_section_by_name (abfd, ".ldata");
6426 if (s && (s->flags & SEC_LOAD))
6427 count++;
6428
6429 return count;
6430 }
6431
6432 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6433
6434 static bfd_boolean
6435 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
6436 {
6437 if (h->plt.offset != (bfd_vma) -1
6438 && !h->def_regular
6439 && !h->pointer_equality_needed)
6440 return FALSE;
6441
6442 return _bfd_elf_hash_symbol (h);
6443 }
6444
6445 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6446
6447 static bfd_boolean
6448 elf_x86_64_relocs_compatible (const bfd_target *input,
6449 const bfd_target *output)
6450 {
6451 return ((xvec_get_elf_backend_data (input)->s->elfclass
6452 == xvec_get_elf_backend_data (output)->s->elfclass)
6453 && _bfd_elf_relocs_compatible (input, output));
6454 }
6455
6456 static const struct bfd_elf_special_section
6457 elf_x86_64_special_sections[]=
6458 {
6459 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6460 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6461 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
6462 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6463 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6464 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6465 { NULL, 0, 0, 0, 0 }
6466 };
6467
6468 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6469 #define TARGET_LITTLE_NAME "elf64-x86-64"
6470 #define ELF_ARCH bfd_arch_i386
6471 #define ELF_TARGET_ID X86_64_ELF_DATA
6472 #define ELF_MACHINE_CODE EM_X86_64
6473 #define ELF_MAXPAGESIZE 0x200000
6474 #define ELF_MINPAGESIZE 0x1000
6475 #define ELF_COMMONPAGESIZE 0x1000
6476
6477 #define elf_backend_can_gc_sections 1
6478 #define elf_backend_can_refcount 1
6479 #define elf_backend_want_got_plt 1
6480 #define elf_backend_plt_readonly 1
6481 #define elf_backend_want_plt_sym 0
6482 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6483 #define elf_backend_rela_normal 1
6484 #define elf_backend_plt_alignment 4
6485 #define elf_backend_extern_protected_data 1
6486
6487 #define elf_info_to_howto elf_x86_64_info_to_howto
6488
6489 #define bfd_elf64_bfd_link_hash_table_create \
6490 elf_x86_64_link_hash_table_create
6491 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6492 #define bfd_elf64_bfd_reloc_name_lookup \
6493 elf_x86_64_reloc_name_lookup
6494
6495 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6496 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6497 #define elf_backend_check_relocs elf_x86_64_check_relocs
6498 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
6499 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
6500 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6501 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6502 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6503 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
6504 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6505 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6506 #ifdef CORE_HEADER
6507 #define elf_backend_write_core_note elf_x86_64_write_core_note
6508 #endif
6509 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6510 #define elf_backend_relocate_section elf_x86_64_relocate_section
6511 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6512 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
6513 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6514 #define elf_backend_object_p elf64_x86_64_elf_object_p
6515 #define bfd_elf64_mkobject elf_x86_64_mkobject
6516 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6517
6518 #define elf_backend_section_from_shdr \
6519 elf_x86_64_section_from_shdr
6520
6521 #define elf_backend_section_from_bfd_section \
6522 elf_x86_64_elf_section_from_bfd_section
6523 #define elf_backend_add_symbol_hook \
6524 elf_x86_64_add_symbol_hook
6525 #define elf_backend_symbol_processing \
6526 elf_x86_64_symbol_processing
6527 #define elf_backend_common_section_index \
6528 elf_x86_64_common_section_index
6529 #define elf_backend_common_section \
6530 elf_x86_64_common_section
6531 #define elf_backend_common_definition \
6532 elf_x86_64_common_definition
6533 #define elf_backend_merge_symbol \
6534 elf_x86_64_merge_symbol
6535 #define elf_backend_special_sections \
6536 elf_x86_64_special_sections
6537 #define elf_backend_additional_program_headers \
6538 elf_x86_64_additional_program_headers
6539 #define elf_backend_hash_symbol \
6540 elf_x86_64_hash_symbol
6541 #define elf_backend_omit_section_dynsym \
6542 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
6543 #define elf_backend_fixup_symbol \
6544 elf_x86_64_fixup_symbol
6545
6546 #include "elf64-target.h"
6547
6548 /* CloudABI support. */
6549
6550 #undef TARGET_LITTLE_SYM
6551 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6552 #undef TARGET_LITTLE_NAME
6553 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6554
6555 #undef ELF_OSABI
6556 #define ELF_OSABI ELFOSABI_CLOUDABI
6557
6558 #undef elf64_bed
6559 #define elf64_bed elf64_x86_64_cloudabi_bed
6560
6561 #include "elf64-target.h"
6562
6563 /* FreeBSD support. */
6564
6565 #undef TARGET_LITTLE_SYM
6566 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6567 #undef TARGET_LITTLE_NAME
6568 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6569
6570 #undef ELF_OSABI
6571 #define ELF_OSABI ELFOSABI_FREEBSD
6572
6573 #undef elf64_bed
6574 #define elf64_bed elf64_x86_64_fbsd_bed
6575
6576 #include "elf64-target.h"
6577
6578 /* Solaris 2 support. */
6579
6580 #undef TARGET_LITTLE_SYM
6581 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6582 #undef TARGET_LITTLE_NAME
6583 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6584
6585 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6586 objects won't be recognized. */
6587 #undef ELF_OSABI
6588
6589 #undef elf64_bed
6590 #define elf64_bed elf64_x86_64_sol2_bed
6591
6592 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6593 boundary. */
6594 #undef elf_backend_static_tls_alignment
6595 #define elf_backend_static_tls_alignment 16
6596
6597 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6598
6599 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6600 File, p.63. */
6601 #undef elf_backend_want_plt_sym
6602 #define elf_backend_want_plt_sym 1
6603
6604 #include "elf64-target.h"
6605
6606 /* Native Client support. */
6607
6608 static bfd_boolean
6609 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
6610 {
6611 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6612 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
6613 return TRUE;
6614 }
6615
6616 #undef TARGET_LITTLE_SYM
6617 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6618 #undef TARGET_LITTLE_NAME
6619 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6620 #undef elf64_bed
6621 #define elf64_bed elf64_x86_64_nacl_bed
6622
6623 #undef ELF_MAXPAGESIZE
6624 #undef ELF_MINPAGESIZE
6625 #undef ELF_COMMONPAGESIZE
6626 #define ELF_MAXPAGESIZE 0x10000
6627 #define ELF_MINPAGESIZE 0x10000
6628 #define ELF_COMMONPAGESIZE 0x10000
6629
6630 /* Restore defaults. */
6631 #undef ELF_OSABI
6632 #undef elf_backend_static_tls_alignment
6633 #undef elf_backend_want_plt_sym
6634 #define elf_backend_want_plt_sym 0
6635
6636 /* NaCl uses substantially different PLT entries for the same effects. */
6637
6638 #undef elf_backend_plt_alignment
6639 #define elf_backend_plt_alignment 5
6640 #define NACL_PLT_ENTRY_SIZE 64
6641 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6642
6643 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
6644 {
6645 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6646 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6647 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6648 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6649 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6650
6651 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6652 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6653
6654 /* 32 bytes of nop to pad out to the standard size. */
6655 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6656 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6657 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6658 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6659 0x66, /* excess data32 prefix */
6660 0x90 /* nop */
6661 };
6662
6663 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6664 {
6665 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6666 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6667 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6668 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6669
6670 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6671 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6672 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6673
6674 /* Lazy GOT entries point here (32-byte aligned). */
6675 0x68, /* pushq immediate */
6676 0, 0, 0, 0, /* replaced with index into relocation table. */
6677 0xe9, /* jmp relative */
6678 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6679
6680 /* 22 bytes of nop to pad out to the standard size. */
6681 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
6682 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6683 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6684 };
6685
6686 /* .eh_frame covering the .plt section. */
6687
6688 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
6689 {
6690 #if (PLT_CIE_LENGTH != 20 \
6691 || PLT_FDE_LENGTH != 36 \
6692 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6693 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6694 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6695 #endif
6696 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6697 0, 0, 0, 0, /* CIE ID */
6698 1, /* CIE version */
6699 'z', 'R', 0, /* Augmentation string */
6700 1, /* Code alignment factor */
6701 0x78, /* Data alignment factor */
6702 16, /* Return address column */
6703 1, /* Augmentation size */
6704 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6705 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6706 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6707 DW_CFA_nop, DW_CFA_nop,
6708
6709 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6710 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
6711 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6712 0, 0, 0, 0, /* .plt size goes here */
6713 0, /* Augmentation size */
6714 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
6715 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6716 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
6717 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6718 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6719 13, /* Block length */
6720 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
6721 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
6722 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6723 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
6724 DW_CFA_nop, DW_CFA_nop
6725 };
6726
6727 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
6728 {
6729 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
6730 elf_x86_64_nacl_plt_entry, /* plt_entry */
6731 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6732 2, /* plt0_got1_offset */
6733 9, /* plt0_got2_offset */
6734 13, /* plt0_got2_insn_end */
6735 3, /* plt_got_offset */
6736 33, /* plt_reloc_offset */
6737 38, /* plt_plt_offset */
6738 7, /* plt_got_insn_size */
6739 42, /* plt_plt_insn_end */
6740 32, /* plt_lazy_offset */
6741 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
6742 sizeof (elf_x86_64_nacl_eh_frame_plt), /* eh_frame_plt_size */
6743 };
6744
6745 #undef elf_backend_arch_data
6746 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6747
6748 #undef elf_backend_object_p
6749 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6750 #undef elf_backend_modify_segment_map
6751 #define elf_backend_modify_segment_map nacl_modify_segment_map
6752 #undef elf_backend_modify_program_headers
6753 #define elf_backend_modify_program_headers nacl_modify_program_headers
6754 #undef elf_backend_final_write_processing
6755 #define elf_backend_final_write_processing nacl_final_write_processing
6756
6757 #include "elf64-target.h"
6758
6759 /* Native Client x32 support. */
6760
6761 static bfd_boolean
6762 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
6763 {
6764 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6765 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
6766 return TRUE;
6767 }
6768
6769 #undef TARGET_LITTLE_SYM
6770 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6771 #undef TARGET_LITTLE_NAME
6772 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6773 #undef elf32_bed
6774 #define elf32_bed elf32_x86_64_nacl_bed
6775
6776 #define bfd_elf32_bfd_link_hash_table_create \
6777 elf_x86_64_link_hash_table_create
6778 #define bfd_elf32_bfd_reloc_type_lookup \
6779 elf_x86_64_reloc_type_lookup
6780 #define bfd_elf32_bfd_reloc_name_lookup \
6781 elf_x86_64_reloc_name_lookup
6782 #define bfd_elf32_mkobject \
6783 elf_x86_64_mkobject
6784 #define bfd_elf32_get_synthetic_symtab \
6785 elf_x86_64_get_synthetic_symtab
6786
6787 #undef elf_backend_object_p
6788 #define elf_backend_object_p \
6789 elf32_x86_64_nacl_elf_object_p
6790
6791 #undef elf_backend_bfd_from_remote_memory
6792 #define elf_backend_bfd_from_remote_memory \
6793 _bfd_elf32_bfd_from_remote_memory
6794
6795 #undef elf_backend_size_info
6796 #define elf_backend_size_info \
6797 _bfd_elf32_size_info
6798
6799 #include "elf32-target.h"
6800
6801 /* Restore defaults. */
6802 #undef elf_backend_object_p
6803 #define elf_backend_object_p elf64_x86_64_elf_object_p
6804 #undef elf_backend_bfd_from_remote_memory
6805 #undef elf_backend_size_info
6806 #undef elf_backend_modify_segment_map
6807 #undef elf_backend_modify_program_headers
6808 #undef elf_backend_final_write_processing
6809
6810 /* Intel L1OM support. */
6811
6812 static bfd_boolean
6813 elf64_l1om_elf_object_p (bfd *abfd)
6814 {
6815 /* Set the right machine number for an L1OM elf64 file. */
6816 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
6817 return TRUE;
6818 }
6819
6820 #undef TARGET_LITTLE_SYM
6821 #define TARGET_LITTLE_SYM l1om_elf64_vec
6822 #undef TARGET_LITTLE_NAME
6823 #define TARGET_LITTLE_NAME "elf64-l1om"
6824 #undef ELF_ARCH
6825 #define ELF_ARCH bfd_arch_l1om
6826
6827 #undef ELF_MACHINE_CODE
6828 #define ELF_MACHINE_CODE EM_L1OM
6829
6830 #undef ELF_OSABI
6831
6832 #undef elf64_bed
6833 #define elf64_bed elf64_l1om_bed
6834
6835 #undef elf_backend_object_p
6836 #define elf_backend_object_p elf64_l1om_elf_object_p
6837
6838 /* Restore defaults. */
6839 #undef ELF_MAXPAGESIZE
6840 #undef ELF_MINPAGESIZE
6841 #undef ELF_COMMONPAGESIZE
6842 #define ELF_MAXPAGESIZE 0x200000
6843 #define ELF_MINPAGESIZE 0x1000
6844 #define ELF_COMMONPAGESIZE 0x1000
6845 #undef elf_backend_plt_alignment
6846 #define elf_backend_plt_alignment 4
6847 #undef elf_backend_arch_data
6848 #define elf_backend_arch_data &elf_x86_64_arch_bed
6849
6850 #include "elf64-target.h"
6851
6852 /* FreeBSD L1OM support. */
6853
6854 #undef TARGET_LITTLE_SYM
6855 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6856 #undef TARGET_LITTLE_NAME
6857 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6858
6859 #undef ELF_OSABI
6860 #define ELF_OSABI ELFOSABI_FREEBSD
6861
6862 #undef elf64_bed
6863 #define elf64_bed elf64_l1om_fbsd_bed
6864
6865 #include "elf64-target.h"
6866
6867 /* Intel K1OM support. */
6868
6869 static bfd_boolean
6870 elf64_k1om_elf_object_p (bfd *abfd)
6871 {
6872 /* Set the right machine number for an K1OM elf64 file. */
6873 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
6874 return TRUE;
6875 }
6876
6877 #undef TARGET_LITTLE_SYM
6878 #define TARGET_LITTLE_SYM k1om_elf64_vec
6879 #undef TARGET_LITTLE_NAME
6880 #define TARGET_LITTLE_NAME "elf64-k1om"
6881 #undef ELF_ARCH
6882 #define ELF_ARCH bfd_arch_k1om
6883
6884 #undef ELF_MACHINE_CODE
6885 #define ELF_MACHINE_CODE EM_K1OM
6886
6887 #undef ELF_OSABI
6888
6889 #undef elf64_bed
6890 #define elf64_bed elf64_k1om_bed
6891
6892 #undef elf_backend_object_p
6893 #define elf_backend_object_p elf64_k1om_elf_object_p
6894
6895 #undef elf_backend_static_tls_alignment
6896
6897 #undef elf_backend_want_plt_sym
6898 #define elf_backend_want_plt_sym 0
6899
6900 #include "elf64-target.h"
6901
6902 /* FreeBSD K1OM support. */
6903
6904 #undef TARGET_LITTLE_SYM
6905 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6906 #undef TARGET_LITTLE_NAME
6907 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6908
6909 #undef ELF_OSABI
6910 #define ELF_OSABI ELFOSABI_FREEBSD
6911
6912 #undef elf64_bed
6913 #define elf64_bed elf64_k1om_fbsd_bed
6914
6915 #include "elf64-target.h"
6916
6917 /* 32bit x86-64 support. */
6918
6919 #undef TARGET_LITTLE_SYM
6920 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6921 #undef TARGET_LITTLE_NAME
6922 #define TARGET_LITTLE_NAME "elf32-x86-64"
6923 #undef elf32_bed
6924
6925 #undef ELF_ARCH
6926 #define ELF_ARCH bfd_arch_i386
6927
6928 #undef ELF_MACHINE_CODE
6929 #define ELF_MACHINE_CODE EM_X86_64
6930
6931 #undef ELF_OSABI
6932
6933 #undef elf_backend_object_p
6934 #define elf_backend_object_p \
6935 elf32_x86_64_elf_object_p
6936
6937 #undef elf_backend_bfd_from_remote_memory
6938 #define elf_backend_bfd_from_remote_memory \
6939 _bfd_elf32_bfd_from_remote_memory
6940
6941 #undef elf_backend_size_info
6942 #define elf_backend_size_info \
6943 _bfd_elf32_size_info
6944
6945 #include "elf32-target.h"
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