projects / deliverable / binutils-gdb.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
x86: Add _bfd_x86_elf_gc_mark_hook
[deliverable/binutils-gdb.git] / bfd / elf64-x86-64.c
1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2017 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "elfxx-x86.h"
23 #include "elf-nacl.h"
24 #include "dwarf2.h"
25 #include "libiberty.h"
26
27 #include "opcode/i386.h"
28 #include "elf/x86-64.h"
29
30 #ifdef CORE_HEADER
31 #include <stdarg.h>
32 #include CORE_HEADER
33 #endif
34
35 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
36 #define MINUS_ONE (~ (bfd_vma) 0)
37
38 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
39 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
40 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
41 since they are the same. */
42
43 /* The relocation "howto" table. Order of fields:
44 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
45 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
46 static reloc_howto_type x86_64_elf_howto_table[] =
47 {
48 HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
49 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
50 FALSE),
51 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
53 FALSE),
54 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
55 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
56 TRUE),
57 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
58 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
59 FALSE),
60 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
61 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
62 TRUE),
63 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
65 FALSE),
66 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
68 MINUS_ONE, FALSE),
69 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
71 MINUS_ONE, FALSE),
72 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
74 MINUS_ONE, FALSE),
75 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
76 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
77 0xffffffff, TRUE),
78 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
79 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
80 FALSE),
81 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
82 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
83 FALSE),
84 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
86 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
88 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
90 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
91 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
92 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
94 MINUS_ONE, FALSE),
95 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
97 MINUS_ONE, FALSE),
98 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
100 MINUS_ONE, FALSE),
101 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
102 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
103 0xffffffff, TRUE),
104 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
105 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
106 0xffffffff, TRUE),
107 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
108 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
109 0xffffffff, FALSE),
110 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
112 0xffffffff, TRUE),
113 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
114 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
115 0xffffffff, FALSE),
116 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
118 TRUE),
119 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
121 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
122 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
123 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
124 FALSE, 0xffffffff, 0xffffffff, TRUE),
125 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
126 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
127 FALSE),
128 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
129 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
130 MINUS_ONE, TRUE),
131 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
132 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
133 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
134 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
135 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
136 MINUS_ONE, FALSE),
137 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
138 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
139 MINUS_ONE, FALSE),
140 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
141 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
142 FALSE),
143 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
144 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
145 FALSE),
146 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
147 complain_overflow_bitfield, bfd_elf_generic_reloc,
148 "R_X86_64_GOTPC32_TLSDESC",
149 FALSE, 0xffffffff, 0xffffffff, TRUE),
150 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
151 complain_overflow_dont, bfd_elf_generic_reloc,
152 "R_X86_64_TLSDESC_CALL",
153 FALSE, 0, 0, FALSE),
154 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
155 complain_overflow_bitfield, bfd_elf_generic_reloc,
156 "R_X86_64_TLSDESC",
157 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
158 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
160 MINUS_ONE, FALSE),
161 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
163 MINUS_ONE, FALSE),
164 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
165 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
166 TRUE),
167 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
168 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
169 TRUE),
170 HOWTO(R_X86_64_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
171 bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", FALSE, 0xffffffff,
172 0xffffffff, TRUE),
173 HOWTO(R_X86_64_REX_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
174 bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", FALSE, 0xffffffff,
175 0xffffffff, TRUE),
176
177 /* We have a gap in the reloc numbers here.
178 R_X86_64_standard counts the number up to this point, and
179 R_X86_64_vt_offset is the value to subtract from a reloc type of
180 R_X86_64_GNU_VT* to form an index into this table. */
181 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
182 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
183
184 /* GNU extension to record C++ vtable hierarchy. */
185 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
186 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
187
188 /* GNU extension to record C++ vtable member usage. */
189 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
190 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
191 FALSE),
192
193 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
194 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
195 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
196 FALSE)
197 };
198
199 #define IS_X86_64_PCREL_TYPE(TYPE) \
200 ( ((TYPE) == R_X86_64_PC8) \
201 || ((TYPE) == R_X86_64_PC16) \
202 || ((TYPE) == R_X86_64_PC32) \
203 || ((TYPE) == R_X86_64_PC32_BND) \
204 || ((TYPE) == R_X86_64_PC64))
205
206 /* Map BFD relocs to the x86_64 elf relocs. */
207 struct elf_reloc_map
208 {
209 bfd_reloc_code_real_type bfd_reloc_val;
210 unsigned char elf_reloc_val;
211 };
212
213 static const struct elf_reloc_map x86_64_reloc_map[] =
214 {
215 { BFD_RELOC_NONE, R_X86_64_NONE, },
216 { BFD_RELOC_64, R_X86_64_64, },
217 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
218 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
219 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
220 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
221 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
222 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
223 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
224 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
225 { BFD_RELOC_32, R_X86_64_32, },
226 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
227 { BFD_RELOC_16, R_X86_64_16, },
228 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
229 { BFD_RELOC_8, R_X86_64_8, },
230 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
231 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
232 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
233 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
234 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
235 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
236 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
237 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
238 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
239 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
240 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
241 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
242 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
243 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
244 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
245 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
246 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
247 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
248 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
249 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
250 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
251 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
252 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
253 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, },
254 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, },
255 { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, },
256 { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, },
257 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
258 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
259 };
260
261 static reloc_howto_type *
262 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
263 {
264 unsigned i;
265
266 if (r_type == (unsigned int) R_X86_64_32)
267 {
268 if (ABI_64_P (abfd))
269 i = r_type;
270 else
271 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
272 }
273 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
274 || r_type >= (unsigned int) R_X86_64_max)
275 {
276 if (r_type >= (unsigned int) R_X86_64_standard)
277 {
278 /* xgettext:c-format */
279 _bfd_error_handler (_("%B: invalid relocation type %d"),
280 abfd, (int) r_type);
281 r_type = R_X86_64_NONE;
282 }
283 i = r_type;
284 }
285 else
286 i = r_type - (unsigned int) R_X86_64_vt_offset;
287 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
288 return &x86_64_elf_howto_table[i];
289 }
290
291 /* Given a BFD reloc type, return a HOWTO structure. */
292 static reloc_howto_type *
293 elf_x86_64_reloc_type_lookup (bfd *abfd,
294 bfd_reloc_code_real_type code)
295 {
296 unsigned int i;
297
298 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
299 i++)
300 {
301 if (x86_64_reloc_map[i].bfd_reloc_val == code)
302 return elf_x86_64_rtype_to_howto (abfd,
303 x86_64_reloc_map[i].elf_reloc_val);
304 }
305 return NULL;
306 }
307
308 static reloc_howto_type *
309 elf_x86_64_reloc_name_lookup (bfd *abfd,
310 const char *r_name)
311 {
312 unsigned int i;
313
314 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
315 {
316 /* Get x32 R_X86_64_32. */
317 reloc_howto_type *reloc
318 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
319 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
320 return reloc;
321 }
322
323 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
324 if (x86_64_elf_howto_table[i].name != NULL
325 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
326 return &x86_64_elf_howto_table[i];
327
328 return NULL;
329 }
330
331 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
332
333 static void
334 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
335 Elf_Internal_Rela *dst)
336 {
337 unsigned r_type;
338
339 r_type = ELF32_R_TYPE (dst->r_info);
340 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
341 BFD_ASSERT (r_type == cache_ptr->howto->type);
342 }
343 \f
344 /* Support for core dump NOTE sections. */
345 static bfd_boolean
346 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
347 {
348 int offset;
349 size_t size;
350
351 switch (note->descsz)
352 {
353 default:
354 return FALSE;
355
356 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
357 /* pr_cursig */
358 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
359
360 /* pr_pid */
361 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
362
363 /* pr_reg */
364 offset = 72;
365 size = 216;
366
367 break;
368
369 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
370 /* pr_cursig */
371 elf_tdata (abfd)->core->signal
372 = bfd_get_16 (abfd, note->descdata + 12);
373
374 /* pr_pid */
375 elf_tdata (abfd)->core->lwpid
376 = bfd_get_32 (abfd, note->descdata + 32);
377
378 /* pr_reg */
379 offset = 112;
380 size = 216;
381
382 break;
383 }
384
385 /* Make a ".reg/999" section. */
386 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
387 size, note->descpos + offset);
388 }
389
390 static bfd_boolean
391 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
392 {
393 switch (note->descsz)
394 {
395 default:
396 return FALSE;
397
398 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
399 elf_tdata (abfd)->core->pid
400 = bfd_get_32 (abfd, note->descdata + 12);
401 elf_tdata (abfd)->core->program
402 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
403 elf_tdata (abfd)->core->command
404 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
405 break;
406
407 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
408 elf_tdata (abfd)->core->pid
409 = bfd_get_32 (abfd, note->descdata + 24);
410 elf_tdata (abfd)->core->program
411 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
412 elf_tdata (abfd)->core->command
413 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
414 }
415
416 /* Note that for some reason, a spurious space is tacked
417 onto the end of the args in some (at least one anyway)
418 implementations, so strip it off if it exists. */
419
420 {
421 char *command = elf_tdata (abfd)->core->command;
422 int n = strlen (command);
423
424 if (0 < n && command[n - 1] == ' ')
425 command[n - 1] = '\0';
426 }
427
428 return TRUE;
429 }
430
431 #ifdef CORE_HEADER
432 static char *
433 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
434 int note_type, ...)
435 {
436 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
437 va_list ap;
438 const char *fname, *psargs;
439 long pid;
440 int cursig;
441 const void *gregs;
442
443 switch (note_type)
444 {
445 default:
446 return NULL;
447
448 case NT_PRPSINFO:
449 va_start (ap, note_type);
450 fname = va_arg (ap, const char *);
451 psargs = va_arg (ap, const char *);
452 va_end (ap);
453
454 if (bed->s->elfclass == ELFCLASS32)
455 {
456 prpsinfo32_t data;
457 memset (&data, 0, sizeof (data));
458 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
459 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
460 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
461 &data, sizeof (data));
462 }
463 else
464 {
465 prpsinfo64_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 /* NOTREACHED */
473
474 case NT_PRSTATUS:
475 va_start (ap, note_type);
476 pid = va_arg (ap, long);
477 cursig = va_arg (ap, int);
478 gregs = va_arg (ap, const void *);
479 va_end (ap);
480
481 if (bed->s->elfclass == ELFCLASS32)
482 {
483 if (bed->elf_machine_code == EM_X86_64)
484 {
485 prstatusx32_t prstat;
486 memset (&prstat, 0, sizeof (prstat));
487 prstat.pr_pid = pid;
488 prstat.pr_cursig = cursig;
489 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
490 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
491 &prstat, sizeof (prstat));
492 }
493 else
494 {
495 prstatus32_t prstat;
496 memset (&prstat, 0, sizeof (prstat));
497 prstat.pr_pid = pid;
498 prstat.pr_cursig = cursig;
499 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
500 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
501 &prstat, sizeof (prstat));
502 }
503 }
504 else
505 {
506 prstatus64_t prstat;
507 memset (&prstat, 0, sizeof (prstat));
508 prstat.pr_pid = pid;
509 prstat.pr_cursig = cursig;
510 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
511 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
512 &prstat, sizeof (prstat));
513 }
514 }
515 /* NOTREACHED */
516 }
517 #endif
518 \f
519 /* Functions for the x86-64 ELF linker. */
520
521 /* The size in bytes of an entry in the global offset table. */
522
523 #define GOT_ENTRY_SIZE 8
524
525 /* The size in bytes of an entry in the lazy procedure linkage table. */
526
527 #define LAZY_PLT_ENTRY_SIZE 16
528
529 /* The size in bytes of an entry in the non-lazy procedure linkage
530 table. */
531
532 #define NON_LAZY_PLT_ENTRY_SIZE 8
533
534 /* The first entry in a lazy procedure linkage table looks like this.
535 See the SVR4 ABI i386 supplement and the x86-64 ABI to see how this
536 works. */
537
538 static const bfd_byte elf_x86_64_lazy_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
539 {
540 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
541 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
542 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
543 };
544
545 /* Subsequent entries in a lazy procedure linkage table look like this. */
546
547 static const bfd_byte elf_x86_64_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
548 {
549 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
550 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
551 0x68, /* pushq immediate */
552 0, 0, 0, 0, /* replaced with index into relocation table. */
553 0xe9, /* jmp relative */
554 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
555 };
556
557 /* The first entry in a lazy procedure linkage table with BND prefix
558 like this. */
559
560 static const bfd_byte elf_x86_64_lazy_bnd_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
561 {
562 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
563 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
564 0x0f, 0x1f, 0 /* nopl (%rax) */
565 };
566
567 /* Subsequent entries for branches with BND prefx in a lazy procedure
568 linkage table look like this. */
569
570 static const bfd_byte elf_x86_64_lazy_bnd_plt_entry[LAZY_PLT_ENTRY_SIZE] =
571 {
572 0x68, 0, 0, 0, 0, /* pushq immediate */
573 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
574 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
575 };
576
577 /* The first entry in the IBT-enabled lazy procedure linkage table is the
578 the same as the lazy PLT with BND prefix so that bound registers are
579 preserved when control is passed to dynamic linker. Subsequent
580 entries for a IBT-enabled lazy procedure linkage table look like
581 this. */
582
583 static const bfd_byte elf_x86_64_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
584 {
585 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
586 0x68, 0, 0, 0, 0, /* pushq immediate */
587 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
588 0x90 /* nop */
589 };
590
591 /* The first entry in the x32 IBT-enabled lazy procedure linkage table
592 is the same as the normal lazy PLT. Subsequent entries for an
593 x32 IBT-enabled lazy procedure linkage table look like this. */
594
595 static const bfd_byte elf_x32_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
596 {
597 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
598 0x68, 0, 0, 0, 0, /* pushq immediate */
599 0xe9, 0, 0, 0, 0, /* jmpq relative */
600 0x66, 0x90 /* xchg %ax,%ax */
601 };
602
603 /* Entries in the non-lazey procedure linkage table look like this. */
604
605 static const bfd_byte elf_x86_64_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
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 non-lazey procedure
613 linkage table look like this. */
614
615 static const bfd_byte elf_x86_64_non_lazy_bnd_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
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 /* Entries for branches with IBT-enabled in the non-lazey procedure
623 linkage table look like this. They have the same size as the lazy
624 PLT entry. */
625
626 static const bfd_byte elf_x86_64_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
627 {
628 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
629 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
630 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
631 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopl 0x0(%rax,%rax,1) */
632 };
633
634 /* Entries for branches with IBT-enabled in the x32 non-lazey procedure
635 linkage table look like this. They have the same size as the lazy
636 PLT entry. */
637
638 static const bfd_byte elf_x32_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
639 {
640 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
641 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
642 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
643 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
644 };
645
646 /* .eh_frame covering the lazy .plt section. */
647
648 static const bfd_byte elf_x86_64_eh_frame_lazy_plt[] =
649 {
650 #define PLT_CIE_LENGTH 20
651 #define PLT_FDE_LENGTH 36
652 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
653 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
654 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
655 0, 0, 0, 0, /* CIE ID */
656 1, /* CIE version */
657 'z', 'R', 0, /* Augmentation string */
658 1, /* Code alignment factor */
659 0x78, /* Data alignment factor */
660 16, /* Return address column */
661 1, /* Augmentation size */
662 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
663 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
664 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
665 DW_CFA_nop, DW_CFA_nop,
666
667 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
668 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
669 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
670 0, 0, 0, 0, /* .plt size goes here */
671 0, /* Augmentation size */
672 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
673 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
674 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
675 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
676 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
677 11, /* Block length */
678 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
679 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
680 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
681 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
682 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
683 };
684
685 /* .eh_frame covering the lazy BND .plt section. */
686
687 static const bfd_byte elf_x86_64_eh_frame_lazy_bnd_plt[] =
688 {
689 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
690 0, 0, 0, 0, /* CIE ID */
691 1, /* CIE version */
692 'z', 'R', 0, /* Augmentation string */
693 1, /* Code alignment factor */
694 0x78, /* Data alignment factor */
695 16, /* Return address column */
696 1, /* Augmentation size */
697 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
698 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
699 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
700 DW_CFA_nop, DW_CFA_nop,
701
702 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
703 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
704 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
705 0, 0, 0, 0, /* .plt size goes here */
706 0, /* Augmentation size */
707 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
708 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
709 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
710 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
711 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
712 11, /* Block length */
713 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
714 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
715 DW_OP_lit15, DW_OP_and, DW_OP_lit5, DW_OP_ge,
716 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
717 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
718 };
719
720 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
721
722 static const bfd_byte elf_x86_64_eh_frame_lazy_ibt_plt[] =
723 {
724 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
725 0, 0, 0, 0, /* CIE ID */
726 1, /* CIE version */
727 'z', 'R', 0, /* Augmentation string */
728 1, /* Code alignment factor */
729 0x78, /* Data alignment factor */
730 16, /* Return address column */
731 1, /* Augmentation size */
732 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
733 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
734 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
735 DW_CFA_nop, DW_CFA_nop,
736
737 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
738 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
739 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
740 0, 0, 0, 0, /* .plt size goes here */
741 0, /* Augmentation size */
742 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
743 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
744 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
745 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
746 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
747 11, /* Block length */
748 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
749 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
750 DW_OP_lit15, DW_OP_and, DW_OP_lit10, DW_OP_ge,
751 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
752 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
753 };
754
755 /* .eh_frame covering the x32 lazy .plt section with IBT-enabled. */
756
757 static const bfd_byte elf_x32_eh_frame_lazy_ibt_plt[] =
758 {
759 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
760 0, 0, 0, 0, /* CIE ID */
761 1, /* CIE version */
762 'z', 'R', 0, /* Augmentation string */
763 1, /* Code alignment factor */
764 0x78, /* Data alignment factor */
765 16, /* Return address column */
766 1, /* Augmentation size */
767 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
768 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
769 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
770 DW_CFA_nop, DW_CFA_nop,
771
772 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
773 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
774 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
775 0, 0, 0, 0, /* .plt size goes here */
776 0, /* Augmentation size */
777 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
778 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
779 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
780 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
781 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
782 11, /* Block length */
783 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
784 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
785 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
786 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
787 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
788 };
789
790 /* .eh_frame covering the non-lazy .plt section. */
791
792 static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt[] =
793 {
794 #define PLT_GOT_FDE_LENGTH 20
795 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
796 0, 0, 0, 0, /* CIE ID */
797 1, /* CIE version */
798 'z', 'R', 0, /* Augmentation string */
799 1, /* Code alignment factor */
800 0x78, /* Data alignment factor */
801 16, /* Return address column */
802 1, /* Augmentation size */
803 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
804 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
805 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
806 DW_CFA_nop, DW_CFA_nop,
807
808 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
809 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
810 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
811 0, 0, 0, 0, /* non-lazy .plt size goes here */
812 0, /* Augmentation size */
813 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop,
814 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
815 };
816
817 /* Architecture-specific backend data for x86-64. */
818
819 struct elf_x86_64_backend_data
820 {
821 /* Target system. */
822 enum
823 {
824 is_normal,
825 is_nacl
826 } os;
827 };
828
829 #define get_elf_x86_64_arch_data(bed) \
830 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
831
832 #define get_elf_x86_64_backend_data(abfd) \
833 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
834
835 /* These are the standard parameters. */
836 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt =
837 {
838 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
839 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
840 elf_x86_64_lazy_plt_entry, /* plt_entry */
841 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
842 2, /* plt0_got1_offset */
843 8, /* plt0_got2_offset */
844 12, /* plt0_got2_insn_end */
845 2, /* plt_got_offset */
846 7, /* plt_reloc_offset */
847 12, /* plt_plt_offset */
848 6, /* plt_got_insn_size */
849 LAZY_PLT_ENTRY_SIZE, /* plt_plt_insn_end */
850 6, /* plt_lazy_offset */
851 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */
852 elf_x86_64_lazy_plt_entry, /* pic_plt_entry */
853 elf_x86_64_eh_frame_lazy_plt, /* eh_frame_plt */
854 sizeof (elf_x86_64_eh_frame_lazy_plt) /* eh_frame_plt_size */
855 };
856
857 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_plt =
858 {
859 elf_x86_64_non_lazy_plt_entry, /* plt_entry */
860 elf_x86_64_non_lazy_plt_entry, /* pic_plt_entry */
861 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
862 2, /* plt_got_offset */
863 6, /* plt_got_insn_size */
864 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
865 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
866 };
867
868 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_bnd_plt =
869 {
870 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
871 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
872 elf_x86_64_lazy_bnd_plt_entry, /* plt_entry */
873 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
874 2, /* plt0_got1_offset */
875 1+8, /* plt0_got2_offset */
876 1+12, /* plt0_got2_insn_end */
877 1+2, /* plt_got_offset */
878 1, /* plt_reloc_offset */
879 7, /* plt_plt_offset */
880 1+6, /* plt_got_insn_size */
881 11, /* plt_plt_insn_end */
882 0, /* plt_lazy_offset */
883 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */
884 elf_x86_64_lazy_bnd_plt_entry, /* pic_plt_entry */
885 elf_x86_64_eh_frame_lazy_bnd_plt, /* eh_frame_plt */
886 sizeof (elf_x86_64_eh_frame_lazy_bnd_plt) /* eh_frame_plt_size */
887 };
888
889 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_bnd_plt =
890 {
891 elf_x86_64_non_lazy_bnd_plt_entry, /* plt_entry */
892 elf_x86_64_non_lazy_bnd_plt_entry, /* pic_plt_entry */
893 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
894 1+2, /* plt_got_offset */
895 1+6, /* plt_got_insn_size */
896 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
897 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
898 };
899
900 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_ibt_plt =
901 {
902 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
903 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
904 elf_x86_64_lazy_ibt_plt_entry, /* plt_entry */
905 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
906 2, /* plt0_got1_offset */
907 1+8, /* plt0_got2_offset */
908 1+12, /* plt0_got2_insn_end */
909 4+1+2, /* plt_got_offset */
910 4+1, /* plt_reloc_offset */
911 4+1+6, /* plt_plt_offset */
912 4+1+6, /* plt_got_insn_size */
913 4+1+5+5, /* plt_plt_insn_end */
914 0, /* plt_lazy_offset */
915 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */
916 elf_x86_64_lazy_ibt_plt_entry, /* pic_plt_entry */
917 elf_x86_64_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
918 sizeof (elf_x86_64_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
919 };
920
921 static const struct elf_x86_lazy_plt_layout elf_x32_lazy_ibt_plt =
922 {
923 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
924 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
925 elf_x32_lazy_ibt_plt_entry, /* plt_entry */
926 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
927 2, /* plt0_got1_offset */
928 8, /* plt0_got2_offset */
929 12, /* plt0_got2_insn_end */
930 4+2, /* plt_got_offset */
931 4+1, /* plt_reloc_offset */
932 4+6, /* plt_plt_offset */
933 4+6, /* plt_got_insn_size */
934 4+5+5, /* plt_plt_insn_end */
935 0, /* plt_lazy_offset */
936 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */
937 elf_x32_lazy_ibt_plt_entry, /* pic_plt_entry */
938 elf_x32_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
939 sizeof (elf_x32_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
940 };
941
942 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_ibt_plt =
943 {
944 elf_x86_64_non_lazy_ibt_plt_entry, /* plt_entry */
945 elf_x86_64_non_lazy_ibt_plt_entry, /* pic_plt_entry */
946 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
947 4+1+2, /* plt_got_offset */
948 4+1+6, /* plt_got_insn_size */
949 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
950 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
951 };
952
953 static const struct elf_x86_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt =
954 {
955 elf_x32_non_lazy_ibt_plt_entry, /* plt_entry */
956 elf_x32_non_lazy_ibt_plt_entry, /* pic_plt_entry */
957 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
958 4+2, /* plt_got_offset */
959 4+6, /* plt_got_insn_size */
960 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
961 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
962 };
963
964 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
965 {
966 is_normal /* os */
967 };
968
969 #define elf_backend_arch_data &elf_x86_64_arch_bed
970
971 /* Values in tls_type of x86 ELF linker hash entry. */
972 #define GOT_TLS_IE 3
973 #define GOT_TLS_GDESC 4
974 #define GOT_TLS_GD_BOTH_P(type) \
975 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
976 #define GOT_TLS_GD_P(type) \
977 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
978 #define GOT_TLS_GDESC_P(type) \
979 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
980 #define GOT_TLS_GD_ANY_P(type) \
981 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
982
983 #define is_x86_64_elf(bfd) \
984 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
985 && elf_tdata (bfd) != NULL \
986 && elf_object_id (bfd) == X86_64_ELF_DATA)
987
988 #define elf_x86_64_compute_jump_table_size(htab) \
989 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
990
991 static bfd_boolean
992 elf64_x86_64_elf_object_p (bfd *abfd)
993 {
994 /* Set the right machine number for an x86-64 elf64 file. */
995 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
996 return TRUE;
997 }
998
999 static bfd_boolean
1000 elf32_x86_64_elf_object_p (bfd *abfd)
1001 {
1002 /* Set the right machine number for an x86-64 elf32 file. */
1003 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1004 return TRUE;
1005 }
1006
1007 /* Return TRUE if the TLS access code sequence support transition
1008 from R_TYPE. */
1009
1010 static bfd_boolean
1011 elf_x86_64_check_tls_transition (bfd *abfd,
1012 struct bfd_link_info *info,
1013 asection *sec,
1014 bfd_byte *contents,
1015 Elf_Internal_Shdr *symtab_hdr,
1016 struct elf_link_hash_entry **sym_hashes,
1017 unsigned int r_type,
1018 const Elf_Internal_Rela *rel,
1019 const Elf_Internal_Rela *relend)
1020 {
1021 unsigned int val;
1022 unsigned long r_symndx;
1023 bfd_boolean largepic = FALSE;
1024 struct elf_link_hash_entry *h;
1025 bfd_vma offset;
1026 struct elf_x86_link_hash_table *htab;
1027 bfd_byte *call;
1028 bfd_boolean indirect_call;
1029
1030 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1031 offset = rel->r_offset;
1032 switch (r_type)
1033 {
1034 case R_X86_64_TLSGD:
1035 case R_X86_64_TLSLD:
1036 if ((rel + 1) >= relend)
1037 return FALSE;
1038
1039 if (r_type == R_X86_64_TLSGD)
1040 {
1041 /* Check transition from GD access model. For 64bit, only
1042 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1043 .word 0x6666; rex64; call __tls_get_addr@PLT
1044 or
1045 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1046 .byte 0x66; rex64
1047 call *__tls_get_addr@GOTPCREL(%rip)
1048 which may be converted to
1049 addr32 call __tls_get_addr
1050 can transit to different access model. For 32bit, only
1051 leaq foo@tlsgd(%rip), %rdi
1052 .word 0x6666; rex64; call __tls_get_addr@PLT
1053 or
1054 leaq foo@tlsgd(%rip), %rdi
1055 .byte 0x66; rex64
1056 call *__tls_get_addr@GOTPCREL(%rip)
1057 which may be converted to
1058 addr32 call __tls_get_addr
1059 can transit to different access model. For largepic,
1060 we also support:
1061 leaq foo@tlsgd(%rip), %rdi
1062 movabsq $__tls_get_addr@pltoff, %rax
1063 addq $r15, %rax
1064 call *%rax
1065 or
1066 leaq foo@tlsgd(%rip), %rdi
1067 movabsq $__tls_get_addr@pltoff, %rax
1068 addq $rbx, %rax
1069 call *%rax */
1070
1071 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1072
1073 if ((offset + 12) > sec->size)
1074 return FALSE;
1075
1076 call = contents + offset + 4;
1077 if (call[0] != 0x66
1078 || !((call[1] == 0x48
1079 && call[2] == 0xff
1080 && call[3] == 0x15)
1081 || (call[1] == 0x48
1082 && call[2] == 0x67
1083 && call[3] == 0xe8)
1084 || (call[1] == 0x66
1085 && call[2] == 0x48
1086 && call[3] == 0xe8)))
1087 {
1088 if (!ABI_64_P (abfd)
1089 || (offset + 19) > sec->size
1090 || offset < 3
1091 || memcmp (call - 7, leaq + 1, 3) != 0
1092 || memcmp (call, "\x48\xb8", 2) != 0
1093 || call[11] != 0x01
1094 || call[13] != 0xff
1095 || call[14] != 0xd0
1096 || !((call[10] == 0x48 && call[12] == 0xd8)
1097 || (call[10] == 0x4c && call[12] == 0xf8)))
1098 return FALSE;
1099 largepic = TRUE;
1100 }
1101 else if (ABI_64_P (abfd))
1102 {
1103 if (offset < 4
1104 || memcmp (contents + offset - 4, leaq, 4) != 0)
1105 return FALSE;
1106 }
1107 else
1108 {
1109 if (offset < 3
1110 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1111 return FALSE;
1112 }
1113 indirect_call = call[2] == 0xff;
1114 }
1115 else
1116 {
1117 /* Check transition from LD access model. Only
1118 leaq foo@tlsld(%rip), %rdi;
1119 call __tls_get_addr@PLT
1120 or
1121 leaq foo@tlsld(%rip), %rdi;
1122 call *__tls_get_addr@GOTPCREL(%rip)
1123 which may be converted to
1124 addr32 call __tls_get_addr
1125 can transit to different access model. For largepic
1126 we also support:
1127 leaq foo@tlsld(%rip), %rdi
1128 movabsq $__tls_get_addr@pltoff, %rax
1129 addq $r15, %rax
1130 call *%rax
1131 or
1132 leaq foo@tlsld(%rip), %rdi
1133 movabsq $__tls_get_addr@pltoff, %rax
1134 addq $rbx, %rax
1135 call *%rax */
1136
1137 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1138
1139 if (offset < 3 || (offset + 9) > sec->size)
1140 return FALSE;
1141
1142 if (memcmp (contents + offset - 3, lea, 3) != 0)
1143 return FALSE;
1144
1145 call = contents + offset + 4;
1146 if (!(call[0] == 0xe8
1147 || (call[0] == 0xff && call[1] == 0x15)
1148 || (call[0] == 0x67 && call[1] == 0xe8)))
1149 {
1150 if (!ABI_64_P (abfd)
1151 || (offset + 19) > sec->size
1152 || memcmp (call, "\x48\xb8", 2) != 0
1153 || call[11] != 0x01
1154 || call[13] != 0xff
1155 || call[14] != 0xd0
1156 || !((call[10] == 0x48 && call[12] == 0xd8)
1157 || (call[10] == 0x4c && call[12] == 0xf8)))
1158 return FALSE;
1159 largepic = TRUE;
1160 }
1161 indirect_call = call[0] == 0xff;
1162 }
1163
1164 r_symndx = htab->r_sym (rel[1].r_info);
1165 if (r_symndx < symtab_hdr->sh_info)
1166 return FALSE;
1167
1168 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1169 if (h == NULL
1170 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
1171 return FALSE;
1172 else if (largepic)
1173 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64;
1174 else if (indirect_call)
1175 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_GOTPCRELX;
1176 else
1177 return (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1178 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
1179
1180 case R_X86_64_GOTTPOFF:
1181 /* Check transition from IE access model:
1182 mov foo@gottpoff(%rip), %reg
1183 add foo@gottpoff(%rip), %reg
1184 */
1185
1186 /* Check REX prefix first. */
1187 if (offset >= 3 && (offset + 4) <= sec->size)
1188 {
1189 val = bfd_get_8 (abfd, contents + offset - 3);
1190 if (val != 0x48 && val != 0x4c)
1191 {
1192 /* X32 may have 0x44 REX prefix or no REX prefix. */
1193 if (ABI_64_P (abfd))
1194 return FALSE;
1195 }
1196 }
1197 else
1198 {
1199 /* X32 may not have any REX prefix. */
1200 if (ABI_64_P (abfd))
1201 return FALSE;
1202 if (offset < 2 || (offset + 3) > sec->size)
1203 return FALSE;
1204 }
1205
1206 val = bfd_get_8 (abfd, contents + offset - 2);
1207 if (val != 0x8b && val != 0x03)
1208 return FALSE;
1209
1210 val = bfd_get_8 (abfd, contents + offset - 1);
1211 return (val & 0xc7) == 5;
1212
1213 case R_X86_64_GOTPC32_TLSDESC:
1214 /* Check transition from GDesc access model:
1215 leaq x@tlsdesc(%rip), %rax
1216
1217 Make sure it's a leaq adding rip to a 32-bit offset
1218 into any register, although it's probably almost always
1219 going to be rax. */
1220
1221 if (offset < 3 || (offset + 4) > sec->size)
1222 return FALSE;
1223
1224 val = bfd_get_8 (abfd, contents + offset - 3);
1225 if ((val & 0xfb) != 0x48)
1226 return FALSE;
1227
1228 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1229 return FALSE;
1230
1231 val = bfd_get_8 (abfd, contents + offset - 1);
1232 return (val & 0xc7) == 0x05;
1233
1234 case R_X86_64_TLSDESC_CALL:
1235 /* Check transition from GDesc access model:
1236 call *x@tlsdesc(%rax)
1237 */
1238 if (offset + 2 <= sec->size)
1239 {
1240 /* Make sure that it's a call *x@tlsdesc(%rax). */
1241 call = contents + offset;
1242 return call[0] == 0xff && call[1] == 0x10;
1243 }
1244
1245 return FALSE;
1246
1247 default:
1248 abort ();
1249 }
1250 }
1251
1252 /* Return TRUE if the TLS access transition is OK or no transition
1253 will be performed. Update R_TYPE if there is a transition. */
1254
1255 static bfd_boolean
1256 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1257 asection *sec, bfd_byte *contents,
1258 Elf_Internal_Shdr *symtab_hdr,
1259 struct elf_link_hash_entry **sym_hashes,
1260 unsigned int *r_type, int tls_type,
1261 const Elf_Internal_Rela *rel,
1262 const Elf_Internal_Rela *relend,
1263 struct elf_link_hash_entry *h,
1264 unsigned long r_symndx,
1265 bfd_boolean from_relocate_section)
1266 {
1267 unsigned int from_type = *r_type;
1268 unsigned int to_type = from_type;
1269 bfd_boolean check = TRUE;
1270
1271 /* Skip TLS transition for functions. */
1272 if (h != NULL
1273 && (h->type == STT_FUNC
1274 || h->type == STT_GNU_IFUNC))
1275 return TRUE;
1276
1277 switch (from_type)
1278 {
1279 case R_X86_64_TLSGD:
1280 case R_X86_64_GOTPC32_TLSDESC:
1281 case R_X86_64_TLSDESC_CALL:
1282 case R_X86_64_GOTTPOFF:
1283 if (bfd_link_executable (info))
1284 {
1285 if (h == NULL)
1286 to_type = R_X86_64_TPOFF32;
1287 else
1288 to_type = R_X86_64_GOTTPOFF;
1289 }
1290
1291 /* When we are called from elf_x86_64_relocate_section, there may
1292 be additional transitions based on TLS_TYPE. */
1293 if (from_relocate_section)
1294 {
1295 unsigned int new_to_type = to_type;
1296
1297 if (bfd_link_executable (info)
1298 && h != NULL
1299 && h->dynindx == -1
1300 && tls_type == GOT_TLS_IE)
1301 new_to_type = R_X86_64_TPOFF32;
1302
1303 if (to_type == R_X86_64_TLSGD
1304 || to_type == R_X86_64_GOTPC32_TLSDESC
1305 || to_type == R_X86_64_TLSDESC_CALL)
1306 {
1307 if (tls_type == GOT_TLS_IE)
1308 new_to_type = R_X86_64_GOTTPOFF;
1309 }
1310
1311 /* We checked the transition before when we were called from
1312 elf_x86_64_check_relocs. We only want to check the new
1313 transition which hasn't been checked before. */
1314 check = new_to_type != to_type && from_type == to_type;
1315 to_type = new_to_type;
1316 }
1317
1318 break;
1319
1320 case R_X86_64_TLSLD:
1321 if (bfd_link_executable (info))
1322 to_type = R_X86_64_TPOFF32;
1323 break;
1324
1325 default:
1326 return TRUE;
1327 }
1328
1329 /* Return TRUE if there is no transition. */
1330 if (from_type == to_type)
1331 return TRUE;
1332
1333 /* Check if the transition can be performed. */
1334 if (check
1335 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1336 symtab_hdr, sym_hashes,
1337 from_type, rel, relend))
1338 {
1339 reloc_howto_type *from, *to;
1340 const char *name;
1341
1342 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1343 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1344
1345 if (h)
1346 name = h->root.root.string;
1347 else
1348 {
1349 struct elf_x86_link_hash_table *htab;
1350
1351 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1352 if (htab == NULL)
1353 name = "*unknown*";
1354 else
1355 {
1356 Elf_Internal_Sym *isym;
1357
1358 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1359 abfd, r_symndx);
1360 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1361 }
1362 }
1363
1364 _bfd_error_handler
1365 /* xgettext:c-format */
1366 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1367 "in section `%A' failed"),
1368 abfd, from->name, to->name, name, rel->r_offset, sec);
1369 bfd_set_error (bfd_error_bad_value);
1370 return FALSE;
1371 }
1372
1373 *r_type = to_type;
1374 return TRUE;
1375 }
1376
1377 /* Rename some of the generic section flags to better document how they
1378 are used here. */
1379 #define need_convert_load sec_flg0
1380 #define check_relocs_failed sec_flg1
1381
1382 static bfd_boolean
1383 elf_x86_64_need_pic (struct bfd_link_info *info,
1384 bfd *input_bfd, asection *sec,
1385 struct elf_link_hash_entry *h,
1386 Elf_Internal_Shdr *symtab_hdr,
1387 Elf_Internal_Sym *isym,
1388 reloc_howto_type *howto)
1389 {
1390 const char *v = "";
1391 const char *und = "";
1392 const char *pic = "";
1393 const char *object;
1394
1395 const char *name;
1396 if (h)
1397 {
1398 name = h->root.root.string;
1399 switch (ELF_ST_VISIBILITY (h->other))
1400 {
1401 case STV_HIDDEN:
1402 v = _("hidden symbol ");
1403 break;
1404 case STV_INTERNAL:
1405 v = _("internal symbol ");
1406 break;
1407 case STV_PROTECTED:
1408 v = _("protected symbol ");
1409 break;
1410 default:
1411 if (((struct elf_x86_link_hash_entry *) h)->def_protected)
1412 v = _("protected symbol ");
1413 else
1414 v = _("symbol ");
1415 pic = _("; recompile with -fPIC");
1416 break;
1417 }
1418
1419 if (!h->def_regular && !h->def_dynamic)
1420 und = _("undefined ");
1421 }
1422 else
1423 {
1424 name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL);
1425 pic = _("; recompile with -fPIC");
1426 }
1427
1428 if (bfd_link_dll (info))
1429 object = _("a shared object");
1430 else if (bfd_link_pie (info))
1431 object = _("a PIE object");
1432 else
1433 object = _("a PDE object");
1434
1435 /* xgettext:c-format */
1436 _bfd_error_handler (_("%B: relocation %s against %s%s`%s' can "
1437 "not be used when making %s%s"),
1438 input_bfd, howto->name, und, v, name,
1439 object, pic);
1440 bfd_set_error (bfd_error_bad_value);
1441 sec->check_relocs_failed = 1;
1442 return FALSE;
1443 }
1444
1445 /* With the local symbol, foo, we convert
1446 mov foo@GOTPCREL(%rip), %reg
1447 to
1448 lea foo(%rip), %reg
1449 and convert
1450 call/jmp *foo@GOTPCREL(%rip)
1451 to
1452 nop call foo/jmp foo nop
1453 When PIC is false, convert
1454 test %reg, foo@GOTPCREL(%rip)
1455 to
1456 test $foo, %reg
1457 and convert
1458 binop foo@GOTPCREL(%rip), %reg
1459 to
1460 binop $foo, %reg
1461 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1462 instructions. */
1463
1464 static bfd_boolean
1465 elf_x86_64_convert_load_reloc (bfd *abfd, asection *sec,
1466 bfd_byte *contents,
1467 Elf_Internal_Rela *irel,
1468 struct elf_link_hash_entry *h,
1469 bfd_boolean *converted,
1470 struct bfd_link_info *link_info)
1471 {
1472 struct elf_x86_link_hash_table *htab;
1473 bfd_boolean is_pic;
1474 bfd_boolean require_reloc_pc32;
1475 bfd_boolean relocx;
1476 bfd_boolean to_reloc_pc32;
1477 asection *tsec;
1478 char symtype;
1479 bfd_signed_vma raddend;
1480 unsigned int opcode;
1481 unsigned int modrm;
1482 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
1483 unsigned int r_symndx;
1484 bfd_vma toff;
1485 bfd_vma roff = irel->r_offset;
1486
1487 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
1488 return TRUE;
1489
1490 raddend = irel->r_addend;
1491 /* Addend for 32-bit PC-relative relocation must be -4. */
1492 if (raddend != -4)
1493 return TRUE;
1494
1495 htab = elf_x86_hash_table (link_info, X86_64_ELF_DATA);
1496 is_pic = bfd_link_pic (link_info);
1497
1498 relocx = (r_type == R_X86_64_GOTPCRELX
1499 || r_type == R_X86_64_REX_GOTPCRELX);
1500
1501 /* TRUE if we can convert only to R_X86_64_PC32. Enable it for
1502 --no-relax. */
1503 require_reloc_pc32
1504 = link_info->disable_target_specific_optimizations > 1;
1505
1506 r_symndx = htab->r_sym (irel->r_info);
1507
1508 opcode = bfd_get_8 (abfd, contents + roff - 2);
1509
1510 /* Convert mov to lea since it has been done for a while. */
1511 if (opcode != 0x8b)
1512 {
1513 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
1514 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
1515 test, xor instructions. */
1516 if (!relocx)
1517 return TRUE;
1518 }
1519
1520 /* We convert only to R_X86_64_PC32:
1521 1. Branch.
1522 2. R_X86_64_GOTPCREL since we can't modify REX byte.
1523 3. require_reloc_pc32 is true.
1524 4. PIC.
1525 */
1526 to_reloc_pc32 = (opcode == 0xff
1527 || !relocx
1528 || require_reloc_pc32
1529 || is_pic);
1530
1531 /* Get the symbol referred to by the reloc. */
1532 if (h == NULL)
1533 {
1534 Elf_Internal_Sym *isym
1535 = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx);
1536
1537 /* Skip relocation against undefined symbols. */
1538 if (isym->st_shndx == SHN_UNDEF)
1539 return TRUE;
1540
1541 symtype = ELF_ST_TYPE (isym->st_info);
1542
1543 if (isym->st_shndx == SHN_ABS)
1544 tsec = bfd_abs_section_ptr;
1545 else if (isym->st_shndx == SHN_COMMON)
1546 tsec = bfd_com_section_ptr;
1547 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
1548 tsec = &_bfd_elf_large_com_section;
1549 else
1550 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1551
1552 toff = isym->st_value;
1553 }
1554 else
1555 {
1556 /* Undefined weak symbol is only bound locally in executable
1557 and its reference is resolved as 0 without relocation
1558 overflow. We can only perform this optimization for
1559 GOTPCRELX relocations since we need to modify REX byte.
1560 It is OK convert mov with R_X86_64_GOTPCREL to
1561 R_X86_64_PC32. */
1562 if ((relocx || opcode == 0x8b)
1563 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info,
1564 X86_64_ELF_DATA,
1565 TRUE,
1566 elf_x86_hash_entry (h)))
1567 {
1568 if (opcode == 0xff)
1569 {
1570 /* Skip for branch instructions since R_X86_64_PC32
1571 may overflow. */
1572 if (require_reloc_pc32)
1573 return TRUE;
1574 }
1575 else if (relocx)
1576 {
1577 /* For non-branch instructions, we can convert to
1578 R_X86_64_32/R_X86_64_32S since we know if there
1579 is a REX byte. */
1580 to_reloc_pc32 = FALSE;
1581 }
1582
1583 /* Since we don't know the current PC when PIC is true,
1584 we can't convert to R_X86_64_PC32. */
1585 if (to_reloc_pc32 && is_pic)
1586 return TRUE;
1587
1588 goto convert;
1589 }
1590 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
1591 ld.so may use its link-time address. */
1592 else if (h->start_stop
1593 || ((h->def_regular
1594 || h->root.type == bfd_link_hash_defined
1595 || h->root.type == bfd_link_hash_defweak)
1596 && h != htab->elf.hdynamic
1597 && SYMBOL_REFERENCES_LOCAL (link_info, h)))
1598 {
1599 /* bfd_link_hash_new or bfd_link_hash_undefined is
1600 set by an assignment in a linker script in
1601 bfd_elf_record_link_assignment. start_stop is set
1602 on __start_SECNAME/__stop_SECNAME which mark section
1603 SECNAME. */
1604 if (h->start_stop
1605 || (h->def_regular
1606 && (h->root.type == bfd_link_hash_new
1607 || h->root.type == bfd_link_hash_undefined
1608 || ((h->root.type == bfd_link_hash_defined
1609 || h->root.type == bfd_link_hash_defweak)
1610 && h->root.u.def.section == bfd_und_section_ptr))))
1611 {
1612 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
1613 if (require_reloc_pc32)
1614 return TRUE;
1615 goto convert;
1616 }
1617 tsec = h->root.u.def.section;
1618 toff = h->root.u.def.value;
1619 symtype = h->type;
1620 }
1621 else
1622 return TRUE;
1623 }
1624
1625 /* Don't convert GOTPCREL relocation against large section. */
1626 if (elf_section_data (tsec) != NULL
1627 && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0)
1628 return TRUE;
1629
1630 /* We can only estimate relocation overflow for R_X86_64_PC32. */
1631 if (!to_reloc_pc32)
1632 goto convert;
1633
1634 if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
1635 {
1636 /* At this stage in linking, no SEC_MERGE symbol has been
1637 adjusted, so all references to such symbols need to be
1638 passed through _bfd_merged_section_offset. (Later, in
1639 relocate_section, all SEC_MERGE symbols *except* for
1640 section symbols have been adjusted.)
1641
1642 gas may reduce relocations against symbols in SEC_MERGE
1643 sections to a relocation against the section symbol when
1644 the original addend was zero. When the reloc is against
1645 a section symbol we should include the addend in the
1646 offset passed to _bfd_merged_section_offset, since the
1647 location of interest is the original symbol. On the
1648 other hand, an access to "sym+addend" where "sym" is not
1649 a section symbol should not include the addend; Such an
1650 access is presumed to be an offset from "sym"; The
1651 location of interest is just "sym". */
1652 if (symtype == STT_SECTION)
1653 toff += raddend;
1654
1655 toff = _bfd_merged_section_offset (abfd, &tsec,
1656 elf_section_data (tsec)->sec_info,
1657 toff);
1658
1659 if (symtype != STT_SECTION)
1660 toff += raddend;
1661 }
1662 else
1663 toff += raddend;
1664
1665 /* Don't convert if R_X86_64_PC32 relocation overflows. */
1666 if (tsec->output_section == sec->output_section)
1667 {
1668 if ((toff - roff + 0x80000000) > 0xffffffff)
1669 return TRUE;
1670 }
1671 else
1672 {
1673 bfd_signed_vma distance;
1674
1675 /* At this point, we don't know the load addresses of TSEC
1676 section nor SEC section. We estimate the distrance between
1677 SEC and TSEC. We store the estimated distances in the
1678 compressed_size field of the output section, which is only
1679 used to decompress the compressed input section. */
1680 if (sec->output_section->compressed_size == 0)
1681 {
1682 asection *asect;
1683 bfd_size_type size = 0;
1684 for (asect = link_info->output_bfd->sections;
1685 asect != NULL;
1686 asect = asect->next)
1687 /* Skip debug sections since compressed_size is used to
1688 compress debug sections. */
1689 if ((asect->flags & SEC_DEBUGGING) == 0)
1690 {
1691 asection *i;
1692 for (i = asect->map_head.s;
1693 i != NULL;
1694 i = i->map_head.s)
1695 {
1696 size = align_power (size, i->alignment_power);
1697 size += i->size;
1698 }
1699 asect->compressed_size = size;
1700 }
1701 }
1702
1703 /* Don't convert GOTPCREL relocations if TSEC isn't placed
1704 after SEC. */
1705 distance = (tsec->output_section->compressed_size
1706 - sec->output_section->compressed_size);
1707 if (distance < 0)
1708 return TRUE;
1709
1710 /* Take PT_GNU_RELRO segment into account by adding
1711 maxpagesize. */
1712 if ((toff + distance + get_elf_backend_data (abfd)->maxpagesize
1713 - roff + 0x80000000) > 0xffffffff)
1714 return TRUE;
1715 }
1716
1717 convert:
1718 if (opcode == 0xff)
1719 {
1720 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
1721 unsigned int nop;
1722 unsigned int disp;
1723 bfd_vma nop_offset;
1724
1725 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
1726 R_X86_64_PC32. */
1727 modrm = bfd_get_8 (abfd, contents + roff - 1);
1728 if (modrm == 0x25)
1729 {
1730 /* Convert to "jmp foo nop". */
1731 modrm = 0xe9;
1732 nop = NOP_OPCODE;
1733 nop_offset = irel->r_offset + 3;
1734 disp = bfd_get_32 (abfd, contents + irel->r_offset);
1735 irel->r_offset -= 1;
1736 bfd_put_32 (abfd, disp, contents + irel->r_offset);
1737 }
1738 else
1739 {
1740 struct elf_x86_link_hash_entry *eh
1741 = (struct elf_x86_link_hash_entry *) h;
1742
1743 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1744 is a nop prefix. */
1745 modrm = 0xe8;
1746 /* To support TLS optimization, always use addr32 prefix for
1747 "call *__tls_get_addr@GOTPCREL(%rip)". */
1748 if (eh && eh->tls_get_addr)
1749 {
1750 nop = 0x67;
1751 nop_offset = irel->r_offset - 2;
1752 }
1753 else
1754 {
1755 nop = link_info->call_nop_byte;
1756 if (link_info->call_nop_as_suffix)
1757 {
1758 nop_offset = irel->r_offset + 3;
1759 disp = bfd_get_32 (abfd, contents + irel->r_offset);
1760 irel->r_offset -= 1;
1761 bfd_put_32 (abfd, disp, contents + irel->r_offset);
1762 }
1763 else
1764 nop_offset = irel->r_offset - 2;
1765 }
1766 }
1767 bfd_put_8 (abfd, nop, contents + nop_offset);
1768 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1769 r_type = R_X86_64_PC32;
1770 }
1771 else
1772 {
1773 unsigned int rex;
1774 unsigned int rex_mask = REX_R;
1775
1776 if (r_type == R_X86_64_REX_GOTPCRELX)
1777 rex = bfd_get_8 (abfd, contents + roff - 3);
1778 else
1779 rex = 0;
1780
1781 if (opcode == 0x8b)
1782 {
1783 if (to_reloc_pc32)
1784 {
1785 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1786 "lea foo(%rip), %reg". */
1787 opcode = 0x8d;
1788 r_type = R_X86_64_PC32;
1789 }
1790 else
1791 {
1792 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1793 "mov $foo, %reg". */
1794 opcode = 0xc7;
1795 modrm = bfd_get_8 (abfd, contents + roff - 1);
1796 modrm = 0xc0 | (modrm & 0x38) >> 3;
1797 if ((rex & REX_W) != 0
1798 && ABI_64_P (link_info->output_bfd))
1799 {
1800 /* Keep the REX_W bit in REX byte for LP64. */
1801 r_type = R_X86_64_32S;
1802 goto rewrite_modrm_rex;
1803 }
1804 else
1805 {
1806 /* If the REX_W bit in REX byte isn't needed,
1807 use R_X86_64_32 and clear the W bit to avoid
1808 sign-extend imm32 to imm64. */
1809 r_type = R_X86_64_32;
1810 /* Clear the W bit in REX byte. */
1811 rex_mask |= REX_W;
1812 goto rewrite_modrm_rex;
1813 }
1814 }
1815 }
1816 else
1817 {
1818 /* R_X86_64_PC32 isn't supported. */
1819 if (to_reloc_pc32)
1820 return TRUE;
1821
1822 modrm = bfd_get_8 (abfd, contents + roff - 1);
1823 if (opcode == 0x85)
1824 {
1825 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
1826 "test $foo, %reg". */
1827 modrm = 0xc0 | (modrm & 0x38) >> 3;
1828 opcode = 0xf7;
1829 }
1830 else
1831 {
1832 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
1833 "binop $foo, %reg". */
1834 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
1835 opcode = 0x81;
1836 }
1837
1838 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
1839 overflow when sign-extending imm32 to imm64. */
1840 r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32;
1841
1842 rewrite_modrm_rex:
1843 bfd_put_8 (abfd, modrm, contents + roff - 1);
1844
1845 if (rex)
1846 {
1847 /* Move the R bit to the B bit in REX byte. */
1848 rex = (rex & ~rex_mask) | (rex & REX_R) >> 2;
1849 bfd_put_8 (abfd, rex, contents + roff - 3);
1850 }
1851
1852 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
1853 irel->r_addend = 0;
1854 }
1855
1856 bfd_put_8 (abfd, opcode, contents + roff - 2);
1857 }
1858
1859 irel->r_info = htab->r_info (r_symndx, r_type);
1860
1861 *converted = TRUE;
1862
1863 return TRUE;
1864 }
1865
1866 /* Look through the relocs for a section during the first phase, and
1867 calculate needed space in the global offset table, procedure
1868 linkage table, and dynamic reloc sections. */
1869
1870 static bfd_boolean
1871 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1872 asection *sec,
1873 const Elf_Internal_Rela *relocs)
1874 {
1875 struct elf_x86_link_hash_table *htab;
1876 Elf_Internal_Shdr *symtab_hdr;
1877 struct elf_link_hash_entry **sym_hashes;
1878 const Elf_Internal_Rela *rel;
1879 const Elf_Internal_Rela *rel_end;
1880 asection *sreloc;
1881 bfd_byte *contents;
1882
1883 if (bfd_link_relocatable (info))
1884 return TRUE;
1885
1886 /* Don't do anything special with non-loaded, non-alloced sections.
1887 In particular, any relocs in such sections should not affect GOT
1888 and PLT reference counting (ie. we don't allow them to create GOT
1889 or PLT entries), there's no possibility or desire to optimize TLS
1890 relocs, and there's not much point in propagating relocs to shared
1891 libs that the dynamic linker won't relocate. */
1892 if ((sec->flags & SEC_ALLOC) == 0)
1893 return TRUE;
1894
1895 BFD_ASSERT (is_x86_64_elf (abfd));
1896
1897 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1898 if (htab == NULL)
1899 {
1900 sec->check_relocs_failed = 1;
1901 return FALSE;
1902 }
1903
1904 /* Get the section contents. */
1905 if (elf_section_data (sec)->this_hdr.contents != NULL)
1906 contents = elf_section_data (sec)->this_hdr.contents;
1907 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1908 {
1909 sec->check_relocs_failed = 1;
1910 return FALSE;
1911 }
1912
1913 symtab_hdr = &elf_symtab_hdr (abfd);
1914 sym_hashes = elf_sym_hashes (abfd);
1915
1916 sreloc = NULL;
1917
1918 rel_end = relocs + sec->reloc_count;
1919 for (rel = relocs; rel < rel_end; rel++)
1920 {
1921 unsigned int r_type;
1922 unsigned int r_symndx;
1923 struct elf_link_hash_entry *h;
1924 struct elf_x86_link_hash_entry *eh;
1925 Elf_Internal_Sym *isym;
1926 const char *name;
1927 bfd_boolean size_reloc;
1928
1929 r_symndx = htab->r_sym (rel->r_info);
1930 r_type = ELF32_R_TYPE (rel->r_info);
1931
1932 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1933 {
1934 /* xgettext:c-format */
1935 _bfd_error_handler (_("%B: bad symbol index: %d"),
1936 abfd, r_symndx);
1937 goto error_return;
1938 }
1939
1940 if (r_symndx < symtab_hdr->sh_info)
1941 {
1942 /* A local symbol. */
1943 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1944 abfd, r_symndx);
1945 if (isym == NULL)
1946 goto error_return;
1947
1948 /* Check relocation against local STT_GNU_IFUNC symbol. */
1949 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1950 {
1951 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel,
1952 TRUE);
1953 if (h == NULL)
1954 goto error_return;
1955
1956 /* Fake a STT_GNU_IFUNC symbol. */
1957 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1958 isym, NULL);
1959 h->type = STT_GNU_IFUNC;
1960 h->def_regular = 1;
1961 h->ref_regular = 1;
1962 h->forced_local = 1;
1963 h->root.type = bfd_link_hash_defined;
1964 }
1965 else
1966 h = NULL;
1967 }
1968 else
1969 {
1970 isym = NULL;
1971 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1972 while (h->root.type == bfd_link_hash_indirect
1973 || h->root.type == bfd_link_hash_warning)
1974 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1975 }
1976
1977 /* Check invalid x32 relocations. */
1978 if (!ABI_64_P (abfd))
1979 switch (r_type)
1980 {
1981 default:
1982 break;
1983
1984 case R_X86_64_DTPOFF64:
1985 case R_X86_64_TPOFF64:
1986 case R_X86_64_PC64:
1987 case R_X86_64_GOTOFF64:
1988 case R_X86_64_GOT64:
1989 case R_X86_64_GOTPCREL64:
1990 case R_X86_64_GOTPC64:
1991 case R_X86_64_GOTPLT64:
1992 case R_X86_64_PLTOFF64:
1993 {
1994 if (h)
1995 name = h->root.root.string;
1996 else
1997 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1998 NULL);
1999 _bfd_error_handler
2000 /* xgettext:c-format */
2001 (_("%B: relocation %s against symbol `%s' isn't "
2002 "supported in x32 mode"), abfd,
2003 x86_64_elf_howto_table[r_type].name, name);
2004 bfd_set_error (bfd_error_bad_value);
2005 goto error_return;
2006 }
2007 break;
2008 }
2009
2010 if (h != NULL)
2011 {
2012 /* It is referenced by a non-shared object. */
2013 h->ref_regular = 1;
2014 h->root.non_ir_ref_regular = 1;
2015
2016 if (h->type == STT_GNU_IFUNC)
2017 elf_tdata (info->output_bfd)->has_gnu_symbols
2018 |= elf_gnu_symbol_ifunc;
2019 }
2020
2021 if (! elf_x86_64_tls_transition (info, abfd, sec, contents,
2022 symtab_hdr, sym_hashes,
2023 &r_type, GOT_UNKNOWN,
2024 rel, rel_end, h, r_symndx, FALSE))
2025 goto error_return;
2026
2027 eh = (struct elf_x86_link_hash_entry *) h;
2028 switch (r_type)
2029 {
2030 case R_X86_64_TLSLD:
2031 htab->tls_ld_or_ldm_got.refcount += 1;
2032 goto create_got;
2033
2034 case R_X86_64_TPOFF32:
2035 if (!bfd_link_executable (info) && ABI_64_P (abfd))
2036 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
2037 &x86_64_elf_howto_table[r_type]);
2038 if (eh != NULL)
2039 eh->has_got_reloc = 1;
2040 break;
2041
2042 case R_X86_64_GOTTPOFF:
2043 if (!bfd_link_executable (info))
2044 info->flags |= DF_STATIC_TLS;
2045 /* Fall through */
2046
2047 case R_X86_64_GOT32:
2048 case R_X86_64_GOTPCREL:
2049 case R_X86_64_GOTPCRELX:
2050 case R_X86_64_REX_GOTPCRELX:
2051 case R_X86_64_TLSGD:
2052 case R_X86_64_GOT64:
2053 case R_X86_64_GOTPCREL64:
2054 case R_X86_64_GOTPLT64:
2055 case R_X86_64_GOTPC32_TLSDESC:
2056 case R_X86_64_TLSDESC_CALL:
2057 /* This symbol requires a global offset table entry. */
2058 {
2059 int tls_type, old_tls_type;
2060
2061 switch (r_type)
2062 {
2063 default: tls_type = GOT_NORMAL; break;
2064 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
2065 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
2066 case R_X86_64_GOTPC32_TLSDESC:
2067 case R_X86_64_TLSDESC_CALL:
2068 tls_type = GOT_TLS_GDESC; break;
2069 }
2070
2071 if (h != NULL)
2072 {
2073 h->got.refcount += 1;
2074 old_tls_type = eh->tls_type;
2075 }
2076 else
2077 {
2078 bfd_signed_vma *local_got_refcounts;
2079
2080 /* This is a global offset table entry for a local symbol. */
2081 local_got_refcounts = elf_local_got_refcounts (abfd);
2082 if (local_got_refcounts == NULL)
2083 {
2084 bfd_size_type size;
2085
2086 size = symtab_hdr->sh_info;
2087 size *= sizeof (bfd_signed_vma)
2088 + sizeof (bfd_vma) + sizeof (char);
2089 local_got_refcounts = ((bfd_signed_vma *)
2090 bfd_zalloc (abfd, size));
2091 if (local_got_refcounts == NULL)
2092 goto error_return;
2093 elf_local_got_refcounts (abfd) = local_got_refcounts;
2094 elf_x86_local_tlsdesc_gotent (abfd)
2095 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2096 elf_x86_local_got_tls_type (abfd)
2097 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2098 }
2099 local_got_refcounts[r_symndx] += 1;
2100 old_tls_type
2101 = elf_x86_local_got_tls_type (abfd) [r_symndx];
2102 }
2103
2104 /* If a TLS symbol is accessed using IE at least once,
2105 there is no point to use dynamic model for it. */
2106 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2107 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2108 || tls_type != GOT_TLS_IE))
2109 {
2110 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
2111 tls_type = old_tls_type;
2112 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2113 && GOT_TLS_GD_ANY_P (tls_type))
2114 tls_type |= old_tls_type;
2115 else
2116 {
2117 if (h)
2118 name = h->root.root.string;
2119 else
2120 name = bfd_elf_sym_name (abfd, symtab_hdr,
2121 isym, NULL);
2122 _bfd_error_handler
2123 /* xgettext:c-format */
2124 (_("%B: '%s' accessed both as normal and"
2125 " thread local symbol"),
2126 abfd, name);
2127 bfd_set_error (bfd_error_bad_value);
2128 goto error_return;
2129 }
2130 }
2131
2132 if (old_tls_type != tls_type)
2133 {
2134 if (eh != NULL)
2135 eh->tls_type = tls_type;
2136 else
2137 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
2138 }
2139 }
2140 /* Fall through */
2141
2142 case R_X86_64_GOTOFF64:
2143 case R_X86_64_GOTPC32:
2144 case R_X86_64_GOTPC64:
2145 create_got:
2146 if (eh != NULL)
2147 eh->has_got_reloc = 1;
2148 break;
2149
2150 case R_X86_64_PLT32:
2151 case R_X86_64_PLT32_BND:
2152 /* This symbol requires a procedure linkage table entry. We
2153 actually build the entry in adjust_dynamic_symbol,
2154 because this might be a case of linking PIC code which is
2155 never referenced by a dynamic object, in which case we
2156 don't need to generate a procedure linkage table entry
2157 after all. */
2158
2159 /* If this is a local symbol, we resolve it directly without
2160 creating a procedure linkage table entry. */
2161 if (h == NULL)
2162 continue;
2163
2164 eh->has_got_reloc = 1;
2165 h->needs_plt = 1;
2166 h->plt.refcount += 1;
2167 break;
2168
2169 case R_X86_64_PLTOFF64:
2170 /* This tries to form the 'address' of a function relative
2171 to GOT. For global symbols we need a PLT entry. */
2172 if (h != NULL)
2173 {
2174 h->needs_plt = 1;
2175 h->plt.refcount += 1;
2176 }
2177 goto create_got;
2178
2179 case R_X86_64_SIZE32:
2180 case R_X86_64_SIZE64:
2181 size_reloc = TRUE;
2182 goto do_size;
2183
2184 case R_X86_64_32:
2185 if (!ABI_64_P (abfd))
2186 goto pointer;
2187 /* Fall through. */
2188 case R_X86_64_8:
2189 case R_X86_64_16:
2190 case R_X86_64_32S:
2191 /* Check relocation overflow as these relocs may lead to
2192 run-time relocation overflow. Don't error out for
2193 sections we don't care about, such as debug sections or
2194 when relocation overflow check is disabled. */
2195 if (!info->no_reloc_overflow_check
2196 && (bfd_link_pic (info)
2197 || (bfd_link_executable (info)
2198 && h != NULL
2199 && !h->def_regular
2200 && h->def_dynamic
2201 && (sec->flags & SEC_READONLY) == 0)))
2202 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
2203 &x86_64_elf_howto_table[r_type]);
2204 /* Fall through. */
2205
2206 case R_X86_64_PC8:
2207 case R_X86_64_PC16:
2208 case R_X86_64_PC32:
2209 case R_X86_64_PC32_BND:
2210 case R_X86_64_PC64:
2211 case R_X86_64_64:
2212 pointer:
2213 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2214 eh->has_non_got_reloc = 1;
2215 /* We are called after all symbols have been resolved. Only
2216 relocation against STT_GNU_IFUNC symbol must go through
2217 PLT. */
2218 if (h != NULL
2219 && (bfd_link_executable (info)
2220 || h->type == STT_GNU_IFUNC))
2221 {
2222 /* If this reloc is in a read-only section, we might
2223 need a copy reloc. We can't check reliably at this
2224 stage whether the section is read-only, as input
2225 sections have not yet been mapped to output sections.
2226 Tentatively set the flag for now, and correct in
2227 adjust_dynamic_symbol. */
2228 h->non_got_ref = 1;
2229
2230 /* We may need a .plt entry if the symbol is a function
2231 defined in a shared lib or is a STT_GNU_IFUNC function
2232 referenced from the code or read-only section. */
2233 if (!h->def_regular
2234 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2235 h->plt.refcount += 1;
2236
2237 if (r_type == R_X86_64_PC32)
2238 {
2239 /* Since something like ".long foo - ." may be used
2240 as pointer, make sure that PLT is used if foo is
2241 a function defined in a shared library. */
2242 if ((sec->flags & SEC_CODE) == 0)
2243 h->pointer_equality_needed = 1;
2244 }
2245 else if (r_type != R_X86_64_PC32_BND
2246 && r_type != R_X86_64_PC64)
2247 {
2248 h->pointer_equality_needed = 1;
2249 /* At run-time, R_X86_64_64 can be resolved for both
2250 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2251 can only be resolved for x32. */
2252 if ((sec->flags & SEC_READONLY) == 0
2253 && (r_type == R_X86_64_64
2254 || (!ABI_64_P (abfd)
2255 && (r_type == R_X86_64_32
2256 || r_type == R_X86_64_32S))))
2257 eh->func_pointer_refcount += 1;
2258 }
2259 }
2260
2261 size_reloc = FALSE;
2262 do_size:
2263 /* If we are creating a shared library, and this is a reloc
2264 against a global symbol, or a non PC relative reloc
2265 against a local symbol, then we need to copy the reloc
2266 into the shared library. However, if we are linking with
2267 -Bsymbolic, we do not need to copy a reloc against a
2268 global symbol which is defined in an object we are
2269 including in the link (i.e., DEF_REGULAR is set). At
2270 this point we have not seen all the input files, so it is
2271 possible that DEF_REGULAR is not set now but will be set
2272 later (it is never cleared). In case of a weak definition,
2273 DEF_REGULAR may be cleared later by a strong definition in
2274 a shared library. We account for that possibility below by
2275 storing information in the relocs_copied field of the hash
2276 table entry. A similar situation occurs when creating
2277 shared libraries and symbol visibility changes render the
2278 symbol local.
2279
2280 If on the other hand, we are creating an executable, we
2281 may need to keep relocations for symbols satisfied by a
2282 dynamic library if we manage to avoid copy relocs for the
2283 symbol.
2284
2285 Generate dynamic pointer relocation against STT_GNU_IFUNC
2286 symbol in the non-code section. */
2287 if ((bfd_link_pic (info)
2288 && (! IS_X86_64_PCREL_TYPE (r_type)
2289 || (h != NULL
2290 && (! (bfd_link_pie (info)
2291 || SYMBOLIC_BIND (info, h))
2292 || h->root.type == bfd_link_hash_defweak
2293 || !h->def_regular))))
2294 || (h != NULL
2295 && h->type == STT_GNU_IFUNC
2296 && r_type == htab->pointer_r_type
2297 && (sec->flags & SEC_CODE) == 0)
2298 || (ELIMINATE_COPY_RELOCS
2299 && !bfd_link_pic (info)
2300 && h != NULL
2301 && (h->root.type == bfd_link_hash_defweak
2302 || !h->def_regular)))
2303 {
2304 struct elf_dyn_relocs *p;
2305 struct elf_dyn_relocs **head;
2306
2307 /* We must copy these reloc types into the output file.
2308 Create a reloc section in dynobj and make room for
2309 this reloc. */
2310 if (sreloc == NULL)
2311 {
2312 sreloc = _bfd_elf_make_dynamic_reloc_section
2313 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2314 abfd, /*rela?*/ TRUE);
2315
2316 if (sreloc == NULL)
2317 goto error_return;
2318 }
2319
2320 /* If this is a global symbol, we count the number of
2321 relocations we need for this symbol. */
2322 if (h != NULL)
2323 head = &eh->dyn_relocs;
2324 else
2325 {
2326 /* Track dynamic relocs needed for local syms too.
2327 We really need local syms available to do this
2328 easily. Oh well. */
2329 asection *s;
2330 void **vpp;
2331
2332 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2333 abfd, r_symndx);
2334 if (isym == NULL)
2335 goto error_return;
2336
2337 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2338 if (s == NULL)
2339 s = sec;
2340
2341 /* Beware of type punned pointers vs strict aliasing
2342 rules. */
2343 vpp = &(elf_section_data (s)->local_dynrel);
2344 head = (struct elf_dyn_relocs **)vpp;
2345 }
2346
2347 p = *head;
2348 if (p == NULL || p->sec != sec)
2349 {
2350 bfd_size_type amt = sizeof *p;
2351
2352 p = ((struct elf_dyn_relocs *)
2353 bfd_alloc (htab->elf.dynobj, amt));
2354 if (p == NULL)
2355 goto error_return;
2356 p->next = *head;
2357 *head = p;
2358 p->sec = sec;
2359 p->count = 0;
2360 p->pc_count = 0;
2361 }
2362
2363 p->count += 1;
2364 /* Count size relocation as PC-relative relocation. */
2365 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2366 p->pc_count += 1;
2367 }
2368 break;
2369
2370 /* This relocation describes the C++ object vtable hierarchy.
2371 Reconstruct it for later use during GC. */
2372 case R_X86_64_GNU_VTINHERIT:
2373 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2374 goto error_return;
2375 break;
2376
2377 /* This relocation describes which C++ vtable entries are actually
2378 used. Record for later use during GC. */
2379 case R_X86_64_GNU_VTENTRY:
2380 BFD_ASSERT (h != NULL);
2381 if (h != NULL
2382 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2383 goto error_return;
2384 break;
2385
2386 default:
2387 break;
2388 }
2389
2390 if ((r_type == R_X86_64_GOTPCREL
2391 || r_type == R_X86_64_GOTPCRELX
2392 || r_type == R_X86_64_REX_GOTPCRELX)
2393 && (h == NULL || h->type != STT_GNU_IFUNC))
2394 sec->need_convert_load = 1;
2395 }
2396
2397 if (elf_section_data (sec)->this_hdr.contents != contents)
2398 {
2399 if (!info->keep_memory)
2400 free (contents);
2401 else
2402 {
2403 /* Cache the section contents for elf_link_input_bfd. */
2404 elf_section_data (sec)->this_hdr.contents = contents;
2405 }
2406 }
2407
2408 return TRUE;
2409
2410 error_return:
2411 if (elf_section_data (sec)->this_hdr.contents != contents)
2412 free (contents);
2413 sec->check_relocs_failed = 1;
2414 return FALSE;
2415 }
2416
2417 /* Allocate space in .plt, .got and associated reloc sections for
2418 dynamic relocs. */
2419
2420 static bfd_boolean
2421 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2422 {
2423 struct bfd_link_info *info;
2424 struct elf_x86_link_hash_table *htab;
2425 struct elf_x86_link_hash_entry *eh;
2426 struct elf_dyn_relocs *p;
2427 const struct elf_backend_data *bed;
2428 unsigned int plt_entry_size;
2429 bfd_boolean resolved_to_zero;
2430
2431 if (h->root.type == bfd_link_hash_indirect)
2432 return TRUE;
2433
2434 eh = (struct elf_x86_link_hash_entry *) h;
2435
2436 info = (struct bfd_link_info *) inf;
2437 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
2438 if (htab == NULL)
2439 return FALSE;
2440 bed = get_elf_backend_data (info->output_bfd);
2441
2442 plt_entry_size = htab->plt.plt_entry_size;
2443
2444 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2445 X86_64_ELF_DATA,
2446 eh->has_got_reloc,
2447 eh);
2448
2449 /* We can't use the GOT PLT if pointer equality is needed since
2450 finish_dynamic_symbol won't clear symbol value and the dynamic
2451 linker won't update the GOT slot. We will get into an infinite
2452 loop at run-time. */
2453 if (htab->plt_got != NULL
2454 && h->type != STT_GNU_IFUNC
2455 && !h->pointer_equality_needed
2456 && h->plt.refcount > 0
2457 && h->got.refcount > 0)
2458 {
2459 /* Don't use the regular PLT if there are both GOT and GOTPLT
2460 reloctions. */
2461 h->plt.offset = (bfd_vma) -1;
2462
2463 /* Use the GOT PLT. */
2464 eh->plt_got.refcount = 1;
2465 }
2466
2467 /* Clear the reference count of function pointer relocations if
2468 symbol isn't a normal function. */
2469 if (h->type != STT_FUNC)
2470 eh->func_pointer_refcount = 0;
2471
2472 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2473 here if it is defined and referenced in a non-shared object. */
2474 if (h->type == STT_GNU_IFUNC
2475 && h->def_regular)
2476 {
2477 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2478 &eh->dyn_relocs,
2479 &htab->readonly_dynrelocs_against_ifunc,
2480 plt_entry_size,
2481 (htab->plt.has_plt0
2482 * plt_entry_size),
2483 GOT_ENTRY_SIZE, TRUE))
2484 {
2485 asection *s = htab->plt_second;
2486 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
2487 {
2488 /* Use the second PLT section if it is created. */
2489 eh->plt_second.offset = s->size;
2490
2491 /* Make room for this entry in the second PLT section. */
2492 s->size += htab->non_lazy_plt->plt_entry_size;
2493 }
2494
2495 return TRUE;
2496 }
2497 else
2498 return FALSE;
2499 }
2500 /* Don't create the PLT entry if there are only function pointer
2501 relocations which can be resolved at run-time. */
2502 else if (htab->elf.dynamic_sections_created
2503 && (h->plt.refcount > eh->func_pointer_refcount
2504 || eh->plt_got.refcount > 0))
2505 {
2506 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
2507
2508 /* Clear the reference count of function pointer relocations
2509 if PLT is used. */
2510 eh->func_pointer_refcount = 0;
2511
2512 /* Make sure this symbol is output as a dynamic symbol.
2513 Undefined weak syms won't yet be marked as dynamic. */
2514 if (h->dynindx == -1
2515 && !h->forced_local
2516 && !resolved_to_zero
2517 && h->root.type == bfd_link_hash_undefweak)
2518 {
2519 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2520 return FALSE;
2521 }
2522
2523 if (bfd_link_pic (info)
2524 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2525 {
2526 asection *s = htab->elf.splt;
2527 asection *second_s = htab->plt_second;
2528 asection *got_s = htab->plt_got;
2529
2530 /* If this is the first .plt entry, make room for the special
2531 first entry. The .plt section is used by prelink to undo
2532 prelinking for dynamic relocations. */
2533 if (s->size == 0)
2534 s->size = htab->plt.has_plt0 * plt_entry_size;
2535
2536 if (use_plt_got)
2537 eh->plt_got.offset = got_s->size;
2538 else
2539 {
2540 h->plt.offset = s->size;
2541 if (second_s)
2542 eh->plt_second.offset = second_s->size;
2543 }
2544
2545 /* If this symbol is not defined in a regular file, and we are
2546 not generating a shared library, then set the symbol to this
2547 location in the .plt. This is required to make function
2548 pointers compare as equal between the normal executable and
2549 the shared library. */
2550 if (! bfd_link_pic (info)
2551 && !h->def_regular)
2552 {
2553 if (use_plt_got)
2554 {
2555 /* We need to make a call to the entry of the GOT PLT
2556 instead of regular PLT entry. */
2557 h->root.u.def.section = got_s;
2558 h->root.u.def.value = eh->plt_got.offset;
2559 }
2560 else
2561 {
2562 if (second_s)
2563 {
2564 /* We need to make a call to the entry of the
2565 second PLT instead of regular PLT entry. */
2566 h->root.u.def.section = second_s;
2567 h->root.u.def.value = eh->plt_second.offset;
2568 }
2569 else
2570 {
2571 h->root.u.def.section = s;
2572 h->root.u.def.value = h->plt.offset;
2573 }
2574 }
2575 }
2576
2577 /* Make room for this entry. */
2578 if (use_plt_got)
2579 got_s->size += htab->non_lazy_plt->plt_entry_size;
2580 else
2581 {
2582 s->size += plt_entry_size;
2583 if (second_s)
2584 second_s->size += htab->non_lazy_plt->plt_entry_size;
2585
2586 /* We also need to make an entry in the .got.plt section,
2587 which will be placed in the .got section by the linker
2588 script. */
2589 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2590
2591 /* There should be no PLT relocation against resolved
2592 undefined weak symbol in executable. */
2593 if (!resolved_to_zero)
2594 {
2595 /* We also need to make an entry in the .rela.plt
2596 section. */
2597 htab->elf.srelplt->size += bed->s->sizeof_rela;
2598 htab->elf.srelplt->reloc_count++;
2599 }
2600 }
2601 }
2602 else
2603 {
2604 eh->plt_got.offset = (bfd_vma) -1;
2605 h->plt.offset = (bfd_vma) -1;
2606 h->needs_plt = 0;
2607 }
2608 }
2609 else
2610 {
2611 eh->plt_got.offset = (bfd_vma) -1;
2612 h->plt.offset = (bfd_vma) -1;
2613 h->needs_plt = 0;
2614 }
2615
2616 eh->tlsdesc_got = (bfd_vma) -1;
2617
2618 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2619 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2620 if (h->got.refcount > 0
2621 && bfd_link_executable (info)
2622 && h->dynindx == -1
2623 && elf_x86_hash_entry (h)->tls_type == GOT_TLS_IE)
2624 {
2625 h->got.offset = (bfd_vma) -1;
2626 }
2627 else if (h->got.refcount > 0)
2628 {
2629 asection *s;
2630 bfd_boolean dyn;
2631 int tls_type = elf_x86_hash_entry (h)->tls_type;
2632
2633 /* Make sure this symbol is output as a dynamic symbol.
2634 Undefined weak syms won't yet be marked as dynamic. */
2635 if (h->dynindx == -1
2636 && !h->forced_local
2637 && !resolved_to_zero
2638 && h->root.type == bfd_link_hash_undefweak)
2639 {
2640 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2641 return FALSE;
2642 }
2643
2644 if (GOT_TLS_GDESC_P (tls_type))
2645 {
2646 eh->tlsdesc_got = htab->elf.sgotplt->size
2647 - elf_x86_64_compute_jump_table_size (htab);
2648 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2649 h->got.offset = (bfd_vma) -2;
2650 }
2651 if (! GOT_TLS_GDESC_P (tls_type)
2652 || GOT_TLS_GD_P (tls_type))
2653 {
2654 s = htab->elf.sgot;
2655 h->got.offset = s->size;
2656 s->size += GOT_ENTRY_SIZE;
2657 if (GOT_TLS_GD_P (tls_type))
2658 s->size += GOT_ENTRY_SIZE;
2659 }
2660 dyn = htab->elf.dynamic_sections_created;
2661 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2662 and two if global. R_X86_64_GOTTPOFF needs one dynamic
2663 relocation. No dynamic relocation against resolved undefined
2664 weak symbol in executable. */
2665 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2666 || tls_type == GOT_TLS_IE)
2667 htab->elf.srelgot->size += bed->s->sizeof_rela;
2668 else if (GOT_TLS_GD_P (tls_type))
2669 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2670 else if (! GOT_TLS_GDESC_P (tls_type)
2671 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2672 && !resolved_to_zero)
2673 || h->root.type != bfd_link_hash_undefweak)
2674 && (bfd_link_pic (info)
2675 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2676 htab->elf.srelgot->size += bed->s->sizeof_rela;
2677 if (GOT_TLS_GDESC_P (tls_type))
2678 {
2679 htab->elf.srelplt->size += bed->s->sizeof_rela;
2680 htab->tlsdesc_plt = (bfd_vma) -1;
2681 }
2682 }
2683 else
2684 h->got.offset = (bfd_vma) -1;
2685
2686 if (eh->dyn_relocs == NULL)
2687 return TRUE;
2688
2689 /* In the shared -Bsymbolic case, discard space allocated for
2690 dynamic pc-relative relocs against symbols which turn out to be
2691 defined in regular objects. For the normal shared case, discard
2692 space for pc-relative relocs that have become local due to symbol
2693 visibility changes. */
2694
2695 if (bfd_link_pic (info))
2696 {
2697 /* Relocs that use pc_count are those that appear on a call
2698 insn, or certain REL relocs that can generated via assembly.
2699 We want calls to protected symbols to resolve directly to the
2700 function rather than going via the plt. If people want
2701 function pointer comparisons to work as expected then they
2702 should avoid writing weird assembly. */
2703 if (SYMBOL_CALLS_LOCAL (info, h))
2704 {
2705 struct elf_dyn_relocs **pp;
2706
2707 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2708 {
2709 p->count -= p->pc_count;
2710 p->pc_count = 0;
2711 if (p->count == 0)
2712 *pp = p->next;
2713 else
2714 pp = &p->next;
2715 }
2716 }
2717
2718 /* Also discard relocs on undefined weak syms with non-default
2719 visibility or in PIE. */
2720 if (eh->dyn_relocs != NULL)
2721 {
2722 if (h->root.type == bfd_link_hash_undefweak)
2723 {
2724 /* Undefined weak symbol is never bound locally in shared
2725 library. */
2726 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2727 || resolved_to_zero)
2728 eh->dyn_relocs = NULL;
2729 else if (h->dynindx == -1
2730 && ! h->forced_local
2731 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2732 return FALSE;
2733 }
2734 /* For PIE, discard space for pc-relative relocs against
2735 symbols which turn out to need copy relocs. */
2736 else if (bfd_link_executable (info)
2737 && (h->needs_copy || eh->needs_copy)
2738 && h->def_dynamic
2739 && !h->def_regular)
2740 {
2741 struct elf_dyn_relocs **pp;
2742
2743 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2744 {
2745 if (p->pc_count != 0)
2746 *pp = p->next;
2747 else
2748 pp = &p->next;
2749 }
2750 }
2751 }
2752 }
2753 else if (ELIMINATE_COPY_RELOCS)
2754 {
2755 /* For the non-shared case, discard space for relocs against
2756 symbols which turn out to need copy relocs or are not
2757 dynamic. Keep dynamic relocations for run-time function
2758 pointer initialization. */
2759
2760 if ((!h->non_got_ref
2761 || eh->func_pointer_refcount > 0
2762 || (h->root.type == bfd_link_hash_undefweak
2763 && !resolved_to_zero))
2764 && ((h->def_dynamic
2765 && !h->def_regular)
2766 || (htab->elf.dynamic_sections_created
2767 && (h->root.type == bfd_link_hash_undefweak
2768 || h->root.type == bfd_link_hash_undefined))))
2769 {
2770 /* Make sure this symbol is output as a dynamic symbol.
2771 Undefined weak syms won't yet be marked as dynamic. */
2772 if (h->dynindx == -1
2773 && ! h->forced_local
2774 && ! resolved_to_zero
2775 && h->root.type == bfd_link_hash_undefweak
2776 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2777 return FALSE;
2778
2779 /* If that succeeded, we know we'll be keeping all the
2780 relocs. */
2781 if (h->dynindx != -1)
2782 goto keep;
2783 }
2784
2785 eh->dyn_relocs = NULL;
2786 eh->func_pointer_refcount = 0;
2787
2788 keep: ;
2789 }
2790
2791 /* Finally, allocate space. */
2792 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2793 {
2794 asection * sreloc;
2795
2796 sreloc = elf_section_data (p->sec)->sreloc;
2797
2798 BFD_ASSERT (sreloc != NULL);
2799
2800 sreloc->size += p->count * bed->s->sizeof_rela;
2801 }
2802
2803 return TRUE;
2804 }
2805
2806 /* Allocate space in .plt, .got and associated reloc sections for
2807 local dynamic relocs. */
2808
2809 static bfd_boolean
2810 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2811 {
2812 struct elf_link_hash_entry *h
2813 = (struct elf_link_hash_entry *) *slot;
2814
2815 if (h->type != STT_GNU_IFUNC
2816 || !h->def_regular
2817 || !h->ref_regular
2818 || !h->forced_local
2819 || h->root.type != bfd_link_hash_defined)
2820 abort ();
2821
2822 return elf_x86_64_allocate_dynrelocs (h, inf);
2823 }
2824
2825 /* Convert load via the GOT slot to load immediate. */
2826
2827 static bfd_boolean
2828 elf_x86_64_convert_load (bfd *abfd, asection *sec,
2829 struct bfd_link_info *link_info)
2830 {
2831 Elf_Internal_Shdr *symtab_hdr;
2832 Elf_Internal_Rela *internal_relocs;
2833 Elf_Internal_Rela *irel, *irelend;
2834 bfd_byte *contents;
2835 struct elf_x86_link_hash_table *htab;
2836 bfd_boolean changed;
2837 bfd_signed_vma *local_got_refcounts;
2838
2839 /* Don't even try to convert non-ELF outputs. */
2840 if (!is_elf_hash_table (link_info->hash))
2841 return FALSE;
2842
2843 /* Nothing to do if there is no need or no output. */
2844 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2845 || sec->need_convert_load == 0
2846 || bfd_is_abs_section (sec->output_section))
2847 return TRUE;
2848
2849 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2850
2851 /* Load the relocations for this section. */
2852 internal_relocs = (_bfd_elf_link_read_relocs
2853 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2854 link_info->keep_memory));
2855 if (internal_relocs == NULL)
2856 return FALSE;
2857
2858 changed = FALSE;
2859 htab = elf_x86_hash_table (link_info, X86_64_ELF_DATA);
2860 local_got_refcounts = elf_local_got_refcounts (abfd);
2861
2862 /* Get the section contents. */
2863 if (elf_section_data (sec)->this_hdr.contents != NULL)
2864 contents = elf_section_data (sec)->this_hdr.contents;
2865 else
2866 {
2867 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2868 goto error_return;
2869 }
2870
2871 irelend = internal_relocs + sec->reloc_count;
2872 for (irel = internal_relocs; irel < irelend; irel++)
2873 {
2874 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2875 unsigned int r_symndx;
2876 struct elf_link_hash_entry *h;
2877 bfd_boolean converted;
2878
2879 if (r_type != R_X86_64_GOTPCRELX
2880 && r_type != R_X86_64_REX_GOTPCRELX
2881 && r_type != R_X86_64_GOTPCREL)
2882 continue;
2883
2884 r_symndx = htab->r_sym (irel->r_info);
2885 if (r_symndx < symtab_hdr->sh_info)
2886 h = _bfd_elf_x86_get_local_sym_hash (htab, sec->owner,
2887 (const Elf_Internal_Rela *) irel,
2888 FALSE);
2889 else
2890 {
2891 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
2892 while (h->root.type == bfd_link_hash_indirect
2893 || h->root.type == bfd_link_hash_warning)
2894 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2895 }
2896
2897 /* STT_GNU_IFUNC must keep GOTPCREL relocations. */
2898 if (h != NULL && h->type == STT_GNU_IFUNC)
2899 continue;
2900
2901 converted = FALSE;
2902 if (!elf_x86_64_convert_load_reloc (abfd, sec, contents, irel, h,
2903 &converted, link_info))
2904 goto error_return;
2905
2906 if (converted)
2907 {
2908 changed = converted;
2909 if (h)
2910 {
2911 if (h->got.refcount > 0)
2912 h->got.refcount -= 1;
2913 }
2914 else
2915 {
2916 if (local_got_refcounts != NULL
2917 && local_got_refcounts[r_symndx] > 0)
2918 local_got_refcounts[r_symndx] -= 1;
2919 }
2920 }
2921 }
2922
2923 if (contents != NULL
2924 && elf_section_data (sec)->this_hdr.contents != contents)
2925 {
2926 if (!changed && !link_info->keep_memory)
2927 free (contents);
2928 else
2929 {
2930 /* Cache the section contents for elf_link_input_bfd. */
2931 elf_section_data (sec)->this_hdr.contents = contents;
2932 }
2933 }
2934
2935 if (elf_section_data (sec)->relocs != internal_relocs)
2936 {
2937 if (!changed)
2938 free (internal_relocs);
2939 else
2940 elf_section_data (sec)->relocs = internal_relocs;
2941 }
2942
2943 return TRUE;
2944
2945 error_return:
2946 if (contents != NULL
2947 && elf_section_data (sec)->this_hdr.contents != contents)
2948 free (contents);
2949 if (internal_relocs != NULL
2950 && elf_section_data (sec)->relocs != internal_relocs)
2951 free (internal_relocs);
2952 return FALSE;
2953 }
2954
2955 /* Set the sizes of the dynamic sections. */
2956
2957 static bfd_boolean
2958 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
2959 struct bfd_link_info *info)
2960 {
2961 struct elf_x86_link_hash_table *htab;
2962 bfd *dynobj;
2963 asection *s;
2964 bfd_boolean relocs;
2965 bfd *ibfd;
2966 const struct elf_backend_data *bed;
2967
2968 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
2969 if (htab == NULL)
2970 return FALSE;
2971 bed = get_elf_backend_data (output_bfd);
2972
2973 dynobj = htab->elf.dynobj;
2974 if (dynobj == NULL)
2975 abort ();
2976
2977 /* Set up .got offsets for local syms, and space for local dynamic
2978 relocs. */
2979 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
2980 {
2981 bfd_signed_vma *local_got;
2982 bfd_signed_vma *end_local_got;
2983 char *local_tls_type;
2984 bfd_vma *local_tlsdesc_gotent;
2985 bfd_size_type locsymcount;
2986 Elf_Internal_Shdr *symtab_hdr;
2987 asection *srel;
2988
2989 if (! is_x86_64_elf (ibfd))
2990 continue;
2991
2992 for (s = ibfd->sections; s != NULL; s = s->next)
2993 {
2994 struct elf_dyn_relocs *p;
2995
2996 if (!elf_x86_64_convert_load (ibfd, s, info))
2997 return FALSE;
2998
2999 for (p = (struct elf_dyn_relocs *)
3000 (elf_section_data (s)->local_dynrel);
3001 p != NULL;
3002 p = p->next)
3003 {
3004 if (!bfd_is_abs_section (p->sec)
3005 && bfd_is_abs_section (p->sec->output_section))
3006 {
3007 /* Input section has been discarded, either because
3008 it is a copy of a linkonce section or due to
3009 linker script /DISCARD/, so we'll be discarding
3010 the relocs too. */
3011 }
3012 else if (p->count != 0)
3013 {
3014 srel = elf_section_data (p->sec)->sreloc;
3015 srel->size += p->count * bed->s->sizeof_rela;
3016 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3017 && (info->flags & DF_TEXTREL) == 0)
3018 {
3019 info->flags |= DF_TEXTREL;
3020 if ((info->warn_shared_textrel && bfd_link_pic (info))
3021 || info->error_textrel)
3022 /* xgettext:c-format */
3023 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3024 p->sec->owner, p->sec);
3025 }
3026 }
3027 }
3028 }
3029
3030 local_got = elf_local_got_refcounts (ibfd);
3031 if (!local_got)
3032 continue;
3033
3034 symtab_hdr = &elf_symtab_hdr (ibfd);
3035 locsymcount = symtab_hdr->sh_info;
3036 end_local_got = local_got + locsymcount;
3037 local_tls_type = elf_x86_local_got_tls_type (ibfd);
3038 local_tlsdesc_gotent = elf_x86_local_tlsdesc_gotent (ibfd);
3039 s = htab->elf.sgot;
3040 srel = htab->elf.srelgot;
3041 for (; local_got < end_local_got;
3042 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3043 {
3044 *local_tlsdesc_gotent = (bfd_vma) -1;
3045 if (*local_got > 0)
3046 {
3047 if (GOT_TLS_GDESC_P (*local_tls_type))
3048 {
3049 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3050 - elf_x86_64_compute_jump_table_size (htab);
3051 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3052 *local_got = (bfd_vma) -2;
3053 }
3054 if (! GOT_TLS_GDESC_P (*local_tls_type)
3055 || GOT_TLS_GD_P (*local_tls_type))
3056 {
3057 *local_got = s->size;
3058 s->size += GOT_ENTRY_SIZE;
3059 if (GOT_TLS_GD_P (*local_tls_type))
3060 s->size += GOT_ENTRY_SIZE;
3061 }
3062 if (bfd_link_pic (info)
3063 || GOT_TLS_GD_ANY_P (*local_tls_type)
3064 || *local_tls_type == GOT_TLS_IE)
3065 {
3066 if (GOT_TLS_GDESC_P (*local_tls_type))
3067 {
3068 htab->elf.srelplt->size
3069 += bed->s->sizeof_rela;
3070 htab->tlsdesc_plt = (bfd_vma) -1;
3071 }
3072 if (! GOT_TLS_GDESC_P (*local_tls_type)
3073 || GOT_TLS_GD_P (*local_tls_type))
3074 srel->size += bed->s->sizeof_rela;
3075 }
3076 }
3077 else
3078 *local_got = (bfd_vma) -1;
3079 }
3080 }
3081
3082 if (htab->tls_ld_or_ldm_got.refcount > 0)
3083 {
3084 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3085 relocs. */
3086 htab->tls_ld_or_ldm_got.offset = htab->elf.sgot->size;
3087 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3088 htab->elf.srelgot->size += bed->s->sizeof_rela;
3089 }
3090 else
3091 htab->tls_ld_or_ldm_got.offset = -1;
3092
3093 /* Allocate global sym .plt and .got entries, and space for global
3094 sym dynamic relocs. */
3095 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3096 info);
3097
3098 /* Allocate .plt and .got entries, and space for local symbols. */
3099 htab_traverse (htab->loc_hash_table,
3100 elf_x86_64_allocate_local_dynrelocs,
3101 info);
3102
3103 /* For every jump slot reserved in the sgotplt, reloc_count is
3104 incremented. However, when we reserve space for TLS descriptors,
3105 it's not incremented, so in order to compute the space reserved
3106 for them, it suffices to multiply the reloc count by the jump
3107 slot size.
3108
3109 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3110 so that R_X86_64_IRELATIVE entries come last. */
3111 if (htab->elf.srelplt)
3112 {
3113 htab->sgotplt_jump_table_size
3114 = elf_x86_64_compute_jump_table_size (htab);
3115 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3116 }
3117 else if (htab->elf.irelplt)
3118 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3119
3120 if (htab->tlsdesc_plt)
3121 {
3122 /* If we're not using lazy TLS relocations, don't generate the
3123 PLT and GOT entries they require. */
3124 if ((info->flags & DF_BIND_NOW))
3125 htab->tlsdesc_plt = 0;
3126 else
3127 {
3128 htab->tlsdesc_got = htab->elf.sgot->size;
3129 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3130 /* Reserve room for the initial entry.
3131 FIXME: we could probably do away with it in this case. */
3132 if (htab->elf.splt->size == 0)
3133 htab->elf.splt->size = htab->plt.plt_entry_size;
3134 htab->tlsdesc_plt = htab->elf.splt->size;
3135 htab->elf.splt->size += htab->plt.plt_entry_size;
3136 }
3137 }
3138
3139 if (htab->elf.sgotplt)
3140 {
3141 /* Don't allocate .got.plt section if there are no GOT nor PLT
3142 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3143 if ((htab->elf.hgot == NULL
3144 || !htab->elf.hgot->ref_regular_nonweak)
3145 && (htab->elf.sgotplt->size
3146 == get_elf_backend_data (output_bfd)->got_header_size)
3147 && (htab->elf.splt == NULL
3148 || htab->elf.splt->size == 0)
3149 && (htab->elf.sgot == NULL
3150 || htab->elf.sgot->size == 0)
3151 && (htab->elf.iplt == NULL
3152 || htab->elf.iplt->size == 0)
3153 && (htab->elf.igotplt == NULL
3154 || htab->elf.igotplt->size == 0))
3155 htab->elf.sgotplt->size = 0;
3156 }
3157
3158 if (_bfd_elf_eh_frame_present (info))
3159 {
3160 if (htab->plt_eh_frame != NULL
3161 && htab->elf.splt != NULL
3162 && htab->elf.splt->size != 0
3163 && !bfd_is_abs_section (htab->elf.splt->output_section))
3164 htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size;
3165
3166 if (htab->plt_got_eh_frame != NULL
3167 && htab->plt_got != NULL
3168 && htab->plt_got->size != 0
3169 && !bfd_is_abs_section (htab->plt_got->output_section))
3170 htab->plt_got_eh_frame->size
3171 = htab->non_lazy_plt->eh_frame_plt_size;
3172
3173 /* Unwind info for the second PLT and .plt.got sections are
3174 identical. */
3175 if (htab->plt_second_eh_frame != NULL
3176 && htab->plt_second != NULL
3177 && htab->plt_second->size != 0
3178 && !bfd_is_abs_section (htab->plt_second->output_section))
3179 htab->plt_second_eh_frame->size
3180 = htab->non_lazy_plt->eh_frame_plt_size;
3181 }
3182
3183 /* We now have determined the sizes of the various dynamic sections.
3184 Allocate memory for them. */
3185 relocs = FALSE;
3186 for (s = dynobj->sections; s != NULL; s = s->next)
3187 {
3188 if ((s->flags & SEC_LINKER_CREATED) == 0)
3189 continue;
3190
3191 if (s == htab->elf.splt
3192 || s == htab->elf.sgot
3193 || s == htab->elf.sgotplt
3194 || s == htab->elf.iplt
3195 || s == htab->elf.igotplt
3196 || s == htab->plt_second
3197 || s == htab->plt_got
3198 || s == htab->plt_eh_frame
3199 || s == htab->plt_got_eh_frame
3200 || s == htab->plt_second_eh_frame
3201 || s == htab->elf.sdynbss
3202 || s == htab->elf.sdynrelro)
3203 {
3204 /* Strip this section if we don't need it; see the
3205 comment below. */
3206 }
3207 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3208 {
3209 if (s->size != 0 && s != htab->elf.srelplt)
3210 relocs = TRUE;
3211
3212 /* We use the reloc_count field as a counter if we need
3213 to copy relocs into the output file. */
3214 if (s != htab->elf.srelplt)
3215 s->reloc_count = 0;
3216 }
3217 else
3218 {
3219 /* It's not one of our sections, so don't allocate space. */
3220 continue;
3221 }
3222
3223 if (s->size == 0)
3224 {
3225 /* If we don't need this section, strip it from the
3226 output file. This is mostly to handle .rela.bss and
3227 .rela.plt. We must create both sections in
3228 create_dynamic_sections, because they must be created
3229 before the linker maps input sections to output
3230 sections. The linker does that before
3231 adjust_dynamic_symbol is called, and it is that
3232 function which decides whether anything needs to go
3233 into these sections. */
3234
3235 s->flags |= SEC_EXCLUDE;
3236 continue;
3237 }
3238
3239 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3240 continue;
3241
3242 /* Allocate memory for the section contents. We use bfd_zalloc
3243 here in case unused entries are not reclaimed before the
3244 section's contents are written out. This should not happen,
3245 but this way if it does, we get a R_X86_64_NONE reloc instead
3246 of garbage. */
3247 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3248 if (s->contents == NULL)
3249 return FALSE;
3250 }
3251
3252 if (htab->plt_eh_frame != NULL
3253 && htab->plt_eh_frame->contents != NULL)
3254 {
3255 memcpy (htab->plt_eh_frame->contents,
3256 htab->plt.eh_frame_plt, htab->plt_eh_frame->size);
3257 bfd_put_32 (dynobj, htab->elf.splt->size,
3258 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3259 }
3260
3261 if (htab->plt_got_eh_frame != NULL
3262 && htab->plt_got_eh_frame->contents != NULL)
3263 {
3264 memcpy (htab->plt_got_eh_frame->contents,
3265 htab->non_lazy_plt->eh_frame_plt,
3266 htab->plt_got_eh_frame->size);
3267 bfd_put_32 (dynobj, htab->plt_got->size,
3268 (htab->plt_got_eh_frame->contents
3269 + PLT_FDE_LEN_OFFSET));
3270 }
3271
3272 if (htab->plt_second_eh_frame != NULL
3273 && htab->plt_second_eh_frame->contents != NULL)
3274 {
3275 memcpy (htab->plt_second_eh_frame->contents,
3276 htab->non_lazy_plt->eh_frame_plt,
3277 htab->plt_second_eh_frame->size);
3278 bfd_put_32 (dynobj, htab->plt_second->size,
3279 (htab->plt_second_eh_frame->contents
3280 + PLT_FDE_LEN_OFFSET));
3281 }
3282
3283 if (htab->elf.dynamic_sections_created)
3284 {
3285 /* Add some entries to the .dynamic section. We fill in the
3286 values later, in elf_x86_64_finish_dynamic_sections, but we
3287 must add the entries now so that we get the correct size for
3288 the .dynamic section. The DT_DEBUG entry is filled in by the
3289 dynamic linker and used by the debugger. */
3290 #define add_dynamic_entry(TAG, VAL) \
3291 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3292
3293 if (bfd_link_executable (info))
3294 {
3295 if (!add_dynamic_entry (DT_DEBUG, 0))
3296 return FALSE;
3297 }
3298
3299 if (htab->elf.splt->size != 0)
3300 {
3301 /* DT_PLTGOT is used by prelink even if there is no PLT
3302 relocation. */
3303 if (!add_dynamic_entry (DT_PLTGOT, 0))
3304 return FALSE;
3305 }
3306
3307 if (htab->elf.srelplt->size != 0)
3308 {
3309 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3310 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3311 || !add_dynamic_entry (DT_JMPREL, 0))
3312 return FALSE;
3313 }
3314
3315 if (htab->tlsdesc_plt
3316 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3317 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3318 return FALSE;
3319
3320 if (relocs)
3321 {
3322 if (!add_dynamic_entry (DT_RELA, 0)
3323 || !add_dynamic_entry (DT_RELASZ, 0)
3324 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3325 return FALSE;
3326
3327 /* If any dynamic relocs apply to a read-only section,
3328 then we need a DT_TEXTREL entry. */
3329 if ((info->flags & DF_TEXTREL) == 0)
3330 elf_link_hash_traverse (&htab->elf,
3331 _bfd_x86_elf_readonly_dynrelocs,
3332 info);
3333
3334 if ((info->flags & DF_TEXTREL) != 0)
3335 {
3336 if (htab->readonly_dynrelocs_against_ifunc)
3337 {
3338 info->callbacks->einfo
3339 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3340 bfd_set_error (bfd_error_bad_value);
3341 return FALSE;
3342 }
3343
3344 if (!add_dynamic_entry (DT_TEXTREL, 0))
3345 return FALSE;
3346 }
3347 }
3348 }
3349 #undef add_dynamic_entry
3350
3351 return TRUE;
3352 }
3353
3354 /* Return the relocation value for @tpoff relocation
3355 if STT_TLS virtual address is ADDRESS. */
3356
3357 static bfd_vma
3358 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3359 {
3360 struct elf_link_hash_table *htab = elf_hash_table (info);
3361 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3362 bfd_vma static_tls_size;
3363
3364 /* If tls_segment is NULL, we should have signalled an error already. */
3365 if (htab->tls_sec == NULL)
3366 return 0;
3367
3368 /* Consider special static TLS alignment requirements. */
3369 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3370 return address - static_tls_size - htab->tls_sec->vma;
3371 }
3372
3373 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3374 branch? */
3375
3376 static bfd_boolean
3377 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3378 {
3379 /* Opcode Instruction
3380 0xe8 call
3381 0xe9 jump
3382 0x0f 0x8x conditional jump */
3383 return ((offset > 0
3384 && (contents [offset - 1] == 0xe8
3385 || contents [offset - 1] == 0xe9))
3386 || (offset > 1
3387 && contents [offset - 2] == 0x0f
3388 && (contents [offset - 1] & 0xf0) == 0x80));
3389 }
3390
3391 /* Relocate an x86_64 ELF section. */
3392
3393 static bfd_boolean
3394 elf_x86_64_relocate_section (bfd *output_bfd,
3395 struct bfd_link_info *info,
3396 bfd *input_bfd,
3397 asection *input_section,
3398 bfd_byte *contents,
3399 Elf_Internal_Rela *relocs,
3400 Elf_Internal_Sym *local_syms,
3401 asection **local_sections)
3402 {
3403 struct elf_x86_link_hash_table *htab;
3404 Elf_Internal_Shdr *symtab_hdr;
3405 struct elf_link_hash_entry **sym_hashes;
3406 bfd_vma *local_got_offsets;
3407 bfd_vma *local_tlsdesc_gotents;
3408 Elf_Internal_Rela *rel;
3409 Elf_Internal_Rela *wrel;
3410 Elf_Internal_Rela *relend;
3411 unsigned int plt_entry_size;
3412
3413 BFD_ASSERT (is_x86_64_elf (input_bfd));
3414
3415 /* Skip if check_relocs failed. */
3416 if (input_section->check_relocs_failed)
3417 return FALSE;
3418
3419 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
3420 if (htab == NULL)
3421 return FALSE;
3422 plt_entry_size = htab->plt.plt_entry_size;
3423 symtab_hdr = &elf_symtab_hdr (input_bfd);
3424 sym_hashes = elf_sym_hashes (input_bfd);
3425 local_got_offsets = elf_local_got_offsets (input_bfd);
3426 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
3427
3428 _bfd_x86_elf_set_tls_module_base (info);
3429
3430 rel = wrel = relocs;
3431 relend = relocs + input_section->reloc_count;
3432 for (; rel < relend; wrel++, rel++)
3433 {
3434 unsigned int r_type;
3435 reloc_howto_type *howto;
3436 unsigned long r_symndx;
3437 struct elf_link_hash_entry *h;
3438 struct elf_x86_link_hash_entry *eh;
3439 Elf_Internal_Sym *sym;
3440 asection *sec;
3441 bfd_vma off, offplt, plt_offset;
3442 bfd_vma relocation;
3443 bfd_boolean unresolved_reloc;
3444 bfd_reloc_status_type r;
3445 int tls_type;
3446 asection *base_got, *resolved_plt;
3447 bfd_vma st_size;
3448 bfd_boolean resolved_to_zero;
3449 bfd_boolean relative_reloc;
3450
3451 r_type = ELF32_R_TYPE (rel->r_info);
3452 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3453 || r_type == (int) R_X86_64_GNU_VTENTRY)
3454 {
3455 if (wrel != rel)
3456 *wrel = *rel;
3457 continue;
3458 }
3459
3460 if (r_type >= (int) R_X86_64_standard)
3461 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
3462
3463 if (r_type != (int) R_X86_64_32
3464 || ABI_64_P (output_bfd))
3465 howto = x86_64_elf_howto_table + r_type;
3466 else
3467 howto = (x86_64_elf_howto_table
3468 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3469 r_symndx = htab->r_sym (rel->r_info);
3470 h = NULL;
3471 sym = NULL;
3472 sec = NULL;
3473 unresolved_reloc = FALSE;
3474 if (r_symndx < symtab_hdr->sh_info)
3475 {
3476 sym = local_syms + r_symndx;
3477 sec = local_sections[r_symndx];
3478
3479 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3480 &sec, rel);
3481 st_size = sym->st_size;
3482
3483 /* Relocate against local STT_GNU_IFUNC symbol. */
3484 if (!bfd_link_relocatable (info)
3485 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3486 {
3487 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd,
3488 rel, FALSE);
3489 if (h == NULL)
3490 abort ();
3491
3492 /* Set STT_GNU_IFUNC symbol value. */
3493 h->root.u.def.value = sym->st_value;
3494 h->root.u.def.section = sec;
3495 }
3496 }
3497 else
3498 {
3499 bfd_boolean warned ATTRIBUTE_UNUSED;
3500 bfd_boolean ignored ATTRIBUTE_UNUSED;
3501
3502 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3503 r_symndx, symtab_hdr, sym_hashes,
3504 h, sec, relocation,
3505 unresolved_reloc, warned, ignored);
3506 st_size = h->size;
3507 }
3508
3509 if (sec != NULL && discarded_section (sec))
3510 {
3511 _bfd_clear_contents (howto, input_bfd, input_section,
3512 contents + rel->r_offset);
3513 wrel->r_offset = rel->r_offset;
3514 wrel->r_info = 0;
3515 wrel->r_addend = 0;
3516
3517 /* For ld -r, remove relocations in debug sections against
3518 sections defined in discarded sections. Not done for
3519 eh_frame editing code expects to be present. */
3520 if (bfd_link_relocatable (info)
3521 && (input_section->flags & SEC_DEBUGGING))
3522 wrel--;
3523
3524 continue;
3525 }
3526
3527 if (bfd_link_relocatable (info))
3528 {
3529 if (wrel != rel)
3530 *wrel = *rel;
3531 continue;
3532 }
3533
3534 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3535 {
3536 if (r_type == R_X86_64_64)
3537 {
3538 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3539 zero-extend it to 64bit if addend is zero. */
3540 r_type = R_X86_64_32;
3541 memset (contents + rel->r_offset + 4, 0, 4);
3542 }
3543 else if (r_type == R_X86_64_SIZE64)
3544 {
3545 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3546 zero-extend it to 64bit if addend is zero. */
3547 r_type = R_X86_64_SIZE32;
3548 memset (contents + rel->r_offset + 4, 0, 4);
3549 }
3550 }
3551
3552 eh = (struct elf_x86_link_hash_entry *) h;
3553
3554 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3555 it here if it is defined in a non-shared object. */
3556 if (h != NULL
3557 && h->type == STT_GNU_IFUNC
3558 && h->def_regular)
3559 {
3560 bfd_vma plt_index;
3561 const char *name;
3562
3563 if ((input_section->flags & SEC_ALLOC) == 0)
3564 {
3565 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3566 sections because such sections are not SEC_ALLOC and
3567 thus ld.so will not process them. */
3568 if ((input_section->flags & SEC_DEBUGGING) != 0)
3569 continue;
3570 abort ();
3571 }
3572
3573 switch (r_type)
3574 {
3575 default:
3576 break;
3577
3578 case R_X86_64_GOTPCREL:
3579 case R_X86_64_GOTPCRELX:
3580 case R_X86_64_REX_GOTPCRELX:
3581 case R_X86_64_GOTPCREL64:
3582 base_got = htab->elf.sgot;
3583 off = h->got.offset;
3584
3585 if (base_got == NULL)
3586 abort ();
3587
3588 if (off == (bfd_vma) -1)
3589 {
3590 /* We can't use h->got.offset here to save state, or
3591 even just remember the offset, as finish_dynamic_symbol
3592 would use that as offset into .got. */
3593
3594 if (h->plt.offset == (bfd_vma) -1)
3595 abort ();
3596
3597 if (htab->elf.splt != NULL)
3598 {
3599 plt_index = (h->plt.offset / plt_entry_size
3600 - htab->plt.has_plt0);
3601 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3602 base_got = htab->elf.sgotplt;
3603 }
3604 else
3605 {
3606 plt_index = h->plt.offset / plt_entry_size;
3607 off = plt_index * GOT_ENTRY_SIZE;
3608 base_got = htab->elf.igotplt;
3609 }
3610
3611 if (h->dynindx == -1
3612 || h->forced_local
3613 || info->symbolic)
3614 {
3615 /* This references the local defitionion. We must
3616 initialize this entry in the global offset table.
3617 Since the offset must always be a multiple of 8,
3618 we use the least significant bit to record
3619 whether we have initialized it already.
3620
3621 When doing a dynamic link, we create a .rela.got
3622 relocation entry to initialize the value. This
3623 is done in the finish_dynamic_symbol routine. */
3624 if ((off & 1) != 0)
3625 off &= ~1;
3626 else
3627 {
3628 bfd_put_64 (output_bfd, relocation,
3629 base_got->contents + off);
3630 /* Note that this is harmless for the GOTPLT64
3631 case, as -1 | 1 still is -1. */
3632 h->got.offset |= 1;
3633 }
3634 }
3635 }
3636
3637 relocation = (base_got->output_section->vma
3638 + base_got->output_offset + off);
3639
3640 goto do_relocation;
3641 }
3642
3643 if (h->plt.offset == (bfd_vma) -1)
3644 {
3645 /* Handle static pointers of STT_GNU_IFUNC symbols. */
3646 if (r_type == htab->pointer_r_type
3647 && (input_section->flags & SEC_CODE) == 0)
3648 goto do_ifunc_pointer;
3649 goto bad_ifunc_reloc;
3650 }
3651
3652 /* STT_GNU_IFUNC symbol must go through PLT. */
3653 if (htab->elf.splt != NULL)
3654 {
3655 if (htab->plt_second != NULL)
3656 {
3657 resolved_plt = htab->plt_second;
3658 plt_offset = eh->plt_second.offset;
3659 }
3660 else
3661 {
3662 resolved_plt = htab->elf.splt;
3663 plt_offset = h->plt.offset;
3664 }
3665 }
3666 else
3667 {
3668 resolved_plt = htab->elf.iplt;
3669 plt_offset = h->plt.offset;
3670 }
3671
3672 relocation = (resolved_plt->output_section->vma
3673 + resolved_plt->output_offset + plt_offset);
3674
3675 switch (r_type)
3676 {
3677 default:
3678 bad_ifunc_reloc:
3679 if (h->root.root.string)
3680 name = h->root.root.string;
3681 else
3682 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3683 NULL);
3684 _bfd_error_handler
3685 /* xgettext:c-format */
3686 (_("%B: relocation %s against STT_GNU_IFUNC "
3687 "symbol `%s' isn't supported"), input_bfd,
3688 howto->name, name);
3689 bfd_set_error (bfd_error_bad_value);
3690 return FALSE;
3691
3692 case R_X86_64_32S:
3693 if (bfd_link_pic (info))
3694 abort ();
3695 goto do_relocation;
3696
3697 case R_X86_64_32:
3698 if (ABI_64_P (output_bfd))
3699 goto do_relocation;
3700 /* FALLTHROUGH */
3701 case R_X86_64_64:
3702 do_ifunc_pointer:
3703 if (rel->r_addend != 0)
3704 {
3705 if (h->root.root.string)
3706 name = h->root.root.string;
3707 else
3708 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3709 sym, NULL);
3710 _bfd_error_handler
3711 /* xgettext:c-format */
3712 (_("%B: relocation %s against STT_GNU_IFUNC "
3713 "symbol `%s' has non-zero addend: %Ld"),
3714 input_bfd, howto->name, name, rel->r_addend);
3715 bfd_set_error (bfd_error_bad_value);
3716 return FALSE;
3717 }
3718
3719 /* Generate dynamic relcoation only when there is a
3720 non-GOT reference in a shared object or there is no
3721 PLT. */
3722 if ((bfd_link_pic (info) && h->non_got_ref)
3723 || h->plt.offset == (bfd_vma) -1)
3724 {
3725 Elf_Internal_Rela outrel;
3726 asection *sreloc;
3727
3728 /* Need a dynamic relocation to get the real function
3729 address. */
3730 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3731 info,
3732 input_section,
3733 rel->r_offset);
3734 if (outrel.r_offset == (bfd_vma) -1
3735 || outrel.r_offset == (bfd_vma) -2)
3736 abort ();
3737
3738 outrel.r_offset += (input_section->output_section->vma
3739 + input_section->output_offset);
3740
3741 if (h->dynindx == -1
3742 || h->forced_local
3743 || bfd_link_executable (info))
3744 {
3745 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3746 h->root.root.string,
3747 h->root.u.def.section->owner);
3748
3749 /* This symbol is resolved locally. */
3750 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3751 outrel.r_addend = (h->root.u.def.value
3752 + h->root.u.def.section->output_section->vma
3753 + h->root.u.def.section->output_offset);
3754 }
3755 else
3756 {
3757 outrel.r_info = htab->r_info (h->dynindx, r_type);
3758 outrel.r_addend = 0;
3759 }
3760
3761 /* Dynamic relocations are stored in
3762 1. .rela.ifunc section in PIC object.
3763 2. .rela.got section in dynamic executable.
3764 3. .rela.iplt section in static executable. */
3765 if (bfd_link_pic (info))
3766 sreloc = htab->elf.irelifunc;
3767 else if (htab->elf.splt != NULL)
3768 sreloc = htab->elf.srelgot;
3769 else
3770 sreloc = htab->elf.irelplt;
3771 elf_append_rela (output_bfd, sreloc, &outrel);
3772
3773 /* If this reloc is against an external symbol, we
3774 do not want to fiddle with the addend. Otherwise,
3775 we need to include the symbol value so that it
3776 becomes an addend for the dynamic reloc. For an
3777 internal symbol, we have updated addend. */
3778 continue;
3779 }
3780 /* FALLTHROUGH */
3781 case R_X86_64_PC32:
3782 case R_X86_64_PC32_BND:
3783 case R_X86_64_PC64:
3784 case R_X86_64_PLT32:
3785 case R_X86_64_PLT32_BND:
3786 goto do_relocation;
3787 }
3788 }
3789
3790 resolved_to_zero = (eh != NULL
3791 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
3792 X86_64_ELF_DATA,
3793 eh->has_got_reloc,
3794 eh));
3795
3796 /* When generating a shared object, the relocations handled here are
3797 copied into the output file to be resolved at run time. */
3798 switch (r_type)
3799 {
3800 case R_X86_64_GOT32:
3801 case R_X86_64_GOT64:
3802 /* Relocation is to the entry for this symbol in the global
3803 offset table. */
3804 case R_X86_64_GOTPCREL:
3805 case R_X86_64_GOTPCRELX:
3806 case R_X86_64_REX_GOTPCRELX:
3807 case R_X86_64_GOTPCREL64:
3808 /* Use global offset table entry as symbol value. */
3809 case R_X86_64_GOTPLT64:
3810 /* This is obsolete and treated the same as GOT64. */
3811 base_got = htab->elf.sgot;
3812
3813 if (htab->elf.sgot == NULL)
3814 abort ();
3815
3816 relative_reloc = FALSE;
3817 if (h != NULL)
3818 {
3819 bfd_boolean dyn;
3820
3821 off = h->got.offset;
3822 if (h->needs_plt
3823 && h->plt.offset != (bfd_vma)-1
3824 && off == (bfd_vma)-1)
3825 {
3826 /* We can't use h->got.offset here to save
3827 state, or even just remember the offset, as
3828 finish_dynamic_symbol would use that as offset into
3829 .got. */
3830 bfd_vma plt_index = (h->plt.offset / plt_entry_size
3831 - htab->plt.has_plt0);
3832 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3833 base_got = htab->elf.sgotplt;
3834 }
3835
3836 dyn = htab->elf.dynamic_sections_created;
3837
3838 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
3839 || (bfd_link_pic (info)
3840 && SYMBOL_REFERENCES_LOCAL (info, h))
3841 || (ELF_ST_VISIBILITY (h->other)
3842 && h->root.type == bfd_link_hash_undefweak))
3843 {
3844 /* This is actually a static link, or it is a -Bsymbolic
3845 link and the symbol is defined locally, or the symbol
3846 was forced to be local because of a version file. We
3847 must initialize this entry in the global offset table.
3848 Since the offset must always be a multiple of 8, we
3849 use the least significant bit to record whether we
3850 have initialized it already.
3851
3852 When doing a dynamic link, we create a .rela.got
3853 relocation entry to initialize the value. This is
3854 done in the finish_dynamic_symbol routine. */
3855 if ((off & 1) != 0)
3856 off &= ~1;
3857 else
3858 {
3859 bfd_put_64 (output_bfd, relocation,
3860 base_got->contents + off);
3861 /* Note that this is harmless for the GOTPLT64 case,
3862 as -1 | 1 still is -1. */
3863 h->got.offset |= 1;
3864
3865 if (h->dynindx == -1
3866 && !h->forced_local
3867 && h->root.type != bfd_link_hash_undefweak
3868 && bfd_link_pic (info))
3869 {
3870 /* If this symbol isn't dynamic in PIC,
3871 generate R_X86_64_RELATIVE here. */
3872 eh->no_finish_dynamic_symbol = 1;
3873 relative_reloc = TRUE;
3874 }
3875 }
3876 }
3877 else
3878 unresolved_reloc = FALSE;
3879 }
3880 else
3881 {
3882 if (local_got_offsets == NULL)
3883 abort ();
3884
3885 off = local_got_offsets[r_symndx];
3886
3887 /* The offset must always be a multiple of 8. We use
3888 the least significant bit to record whether we have
3889 already generated the necessary reloc. */
3890 if ((off & 1) != 0)
3891 off &= ~1;
3892 else
3893 {
3894 bfd_put_64 (output_bfd, relocation,
3895 base_got->contents + off);
3896 local_got_offsets[r_symndx] |= 1;
3897
3898 if (bfd_link_pic (info))
3899 relative_reloc = TRUE;
3900 }
3901 }
3902
3903 if (relative_reloc)
3904 {
3905 asection *s;
3906 Elf_Internal_Rela outrel;
3907
3908 /* We need to generate a R_X86_64_RELATIVE reloc
3909 for the dynamic linker. */
3910 s = htab->elf.srelgot;
3911 if (s == NULL)
3912 abort ();
3913
3914 outrel.r_offset = (base_got->output_section->vma
3915 + base_got->output_offset
3916 + off);
3917 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3918 outrel.r_addend = relocation;
3919 elf_append_rela (output_bfd, s, &outrel);
3920 }
3921
3922 if (off >= (bfd_vma) -2)
3923 abort ();
3924
3925 relocation = base_got->output_section->vma
3926 + base_got->output_offset + off;
3927 if (r_type != R_X86_64_GOTPCREL
3928 && r_type != R_X86_64_GOTPCRELX
3929 && r_type != R_X86_64_REX_GOTPCRELX
3930 && r_type != R_X86_64_GOTPCREL64)
3931 relocation -= htab->elf.sgotplt->output_section->vma
3932 - htab->elf.sgotplt->output_offset;
3933
3934 break;
3935
3936 case R_X86_64_GOTOFF64:
3937 /* Relocation is relative to the start of the global offset
3938 table. */
3939
3940 /* Check to make sure it isn't a protected function or data
3941 symbol for shared library since it may not be local when
3942 used as function address or with copy relocation. We also
3943 need to make sure that a symbol is referenced locally. */
3944 if (bfd_link_pic (info) && h)
3945 {
3946 if (!h->def_regular)
3947 {
3948 const char *v;
3949
3950 switch (ELF_ST_VISIBILITY (h->other))
3951 {
3952 case STV_HIDDEN:
3953 v = _("hidden symbol");
3954 break;
3955 case STV_INTERNAL:
3956 v = _("internal symbol");
3957 break;
3958 case STV_PROTECTED:
3959 v = _("protected symbol");
3960 break;
3961 default:
3962 v = _("symbol");
3963 break;
3964 }
3965
3966 _bfd_error_handler
3967 /* xgettext:c-format */
3968 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s"
3969 " `%s' can not be used when making a shared object"),
3970 input_bfd, v, h->root.root.string);
3971 bfd_set_error (bfd_error_bad_value);
3972 return FALSE;
3973 }
3974 else if (!bfd_link_executable (info)
3975 && !SYMBOL_REFERENCES_LOCAL (info, h)
3976 && (h->type == STT_FUNC
3977 || h->type == STT_OBJECT)
3978 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3979 {
3980 _bfd_error_handler
3981 /* xgettext:c-format */
3982 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s"
3983 " `%s' can not be used when making a shared object"),
3984 input_bfd,
3985 h->type == STT_FUNC ? "function" : "data",
3986 h->root.root.string);
3987 bfd_set_error (bfd_error_bad_value);
3988 return FALSE;
3989 }
3990 }
3991
3992 /* Note that sgot is not involved in this
3993 calculation. We always want the start of .got.plt. If we
3994 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3995 permitted by the ABI, we might have to change this
3996 calculation. */
3997 relocation -= htab->elf.sgotplt->output_section->vma
3998 + htab->elf.sgotplt->output_offset;
3999 break;
4000
4001 case R_X86_64_GOTPC32:
4002 case R_X86_64_GOTPC64:
4003 /* Use global offset table as symbol value. */
4004 relocation = htab->elf.sgotplt->output_section->vma
4005 + htab->elf.sgotplt->output_offset;
4006 unresolved_reloc = FALSE;
4007 break;
4008
4009 case R_X86_64_PLTOFF64:
4010 /* Relocation is PLT entry relative to GOT. For local
4011 symbols it's the symbol itself relative to GOT. */
4012 if (h != NULL
4013 /* See PLT32 handling. */
4014 && (h->plt.offset != (bfd_vma) -1
4015 || eh->plt_got.offset != (bfd_vma) -1)
4016 && htab->elf.splt != NULL)
4017 {
4018 if (eh->plt_got.offset != (bfd_vma) -1)
4019 {
4020 /* Use the GOT PLT. */
4021 resolved_plt = htab->plt_got;
4022 plt_offset = eh->plt_got.offset;
4023 }
4024 else if (htab->plt_second != NULL)
4025 {
4026 resolved_plt = htab->plt_second;
4027 plt_offset = eh->plt_second.offset;
4028 }
4029 else
4030 {
4031 resolved_plt = htab->elf.splt;
4032 plt_offset = h->plt.offset;
4033 }
4034
4035 relocation = (resolved_plt->output_section->vma
4036 + resolved_plt->output_offset
4037 + plt_offset);
4038 unresolved_reloc = FALSE;
4039 }
4040
4041 relocation -= htab->elf.sgotplt->output_section->vma
4042 + htab->elf.sgotplt->output_offset;
4043 break;
4044
4045 case R_X86_64_PLT32:
4046 case R_X86_64_PLT32_BND:
4047 /* Relocation is to the entry for this symbol in the
4048 procedure linkage table. */
4049
4050 /* Resolve a PLT32 reloc against a local symbol directly,
4051 without using the procedure linkage table. */
4052 if (h == NULL)
4053 break;
4054
4055 if ((h->plt.offset == (bfd_vma) -1
4056 && eh->plt_got.offset == (bfd_vma) -1)
4057 || htab->elf.splt == NULL)
4058 {
4059 /* We didn't make a PLT entry for this symbol. This
4060 happens when statically linking PIC code, or when
4061 using -Bsymbolic. */
4062 break;
4063 }
4064
4065 if (h->plt.offset != (bfd_vma) -1)
4066 {
4067 if (htab->plt_second != NULL)
4068 {
4069 resolved_plt = htab->plt_second;
4070 plt_offset = eh->plt_second.offset;
4071 }
4072 else
4073 {
4074 resolved_plt = htab->elf.splt;
4075 plt_offset = h->plt.offset;
4076 }
4077 }
4078 else
4079 {
4080 /* Use the GOT PLT. */
4081 resolved_plt = htab->plt_got;
4082 plt_offset = eh->plt_got.offset;
4083 }
4084
4085 relocation = (resolved_plt->output_section->vma
4086 + resolved_plt->output_offset
4087 + plt_offset);
4088 unresolved_reloc = FALSE;
4089 break;
4090
4091 case R_X86_64_SIZE32:
4092 case R_X86_64_SIZE64:
4093 /* Set to symbol size. */
4094 relocation = st_size;
4095 goto direct;
4096
4097 case R_X86_64_PC8:
4098 case R_X86_64_PC16:
4099 case R_X86_64_PC32:
4100 case R_X86_64_PC32_BND:
4101 /* Don't complain about -fPIC if the symbol is undefined when
4102 building executable unless it is unresolved weak symbol or
4103 -z nocopyreloc is used. */
4104 if ((input_section->flags & SEC_ALLOC) != 0
4105 && (input_section->flags & SEC_READONLY) != 0
4106 && h != NULL
4107 && ((bfd_link_executable (info)
4108 && ((h->root.type == bfd_link_hash_undefweak
4109 && !resolved_to_zero)
4110 || ((info->nocopyreloc
4111 || (eh->def_protected
4112 && elf_has_no_copy_on_protected (h->root.u.def.section->owner)))
4113 && h->def_dynamic
4114 && !(h->root.u.def.section->flags & SEC_CODE))))
4115 || bfd_link_dll (info)))
4116 {
4117 bfd_boolean fail = FALSE;
4118 bfd_boolean branch
4119 = ((r_type == R_X86_64_PC32
4120 || r_type == R_X86_64_PC32_BND)
4121 && is_32bit_relative_branch (contents, rel->r_offset));
4122
4123 if (SYMBOL_REFERENCES_LOCAL (info, h))
4124 {
4125 /* Symbol is referenced locally. Make sure it is
4126 defined locally or for a branch. */
4127 fail = (!(h->def_regular || ELF_COMMON_DEF_P (h))
4128 && !branch);
4129 }
4130 else if (!(bfd_link_pie (info)
4131 && (h->needs_copy || eh->needs_copy)))
4132 {
4133 /* Symbol doesn't need copy reloc and isn't referenced
4134 locally. We only allow branch to symbol with
4135 non-default visibility. */
4136 fail = (!branch
4137 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4138 }
4139
4140 if (fail)
4141 return elf_x86_64_need_pic (info, input_bfd, input_section,
4142 h, NULL, NULL, howto);
4143 }
4144 /* Fall through. */
4145
4146 case R_X86_64_8:
4147 case R_X86_64_16:
4148 case R_X86_64_32:
4149 case R_X86_64_PC64:
4150 case R_X86_64_64:
4151 /* FIXME: The ABI says the linker should make sure the value is
4152 the same when it's zeroextended to 64 bit. */
4153
4154 direct:
4155 if ((input_section->flags & SEC_ALLOC) == 0)
4156 break;
4157
4158 /* Don't copy a pc-relative relocation into the output file
4159 if the symbol needs copy reloc or the symbol is undefined
4160 when building executable. Copy dynamic function pointer
4161 relocations. Don't generate dynamic relocations against
4162 resolved undefined weak symbols in PIE. */
4163 if ((bfd_link_pic (info)
4164 && !(bfd_link_pie (info)
4165 && h != NULL
4166 && (h->needs_copy
4167 || eh->needs_copy
4168 || h->root.type == bfd_link_hash_undefined)
4169 && (IS_X86_64_PCREL_TYPE (r_type)
4170 || r_type == R_X86_64_SIZE32
4171 || r_type == R_X86_64_SIZE64))
4172 && (h == NULL
4173 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4174 && !resolved_to_zero)
4175 || h->root.type != bfd_link_hash_undefweak))
4176 && ((! IS_X86_64_PCREL_TYPE (r_type)
4177 && r_type != R_X86_64_SIZE32
4178 && r_type != R_X86_64_SIZE64)
4179 || ! SYMBOL_CALLS_LOCAL (info, h)))
4180 || (ELIMINATE_COPY_RELOCS
4181 && !bfd_link_pic (info)
4182 && h != NULL
4183 && h->dynindx != -1
4184 && (!h->non_got_ref
4185 || eh->func_pointer_refcount > 0
4186 || (h->root.type == bfd_link_hash_undefweak
4187 && !resolved_to_zero))
4188 && ((h->def_dynamic && !h->def_regular)
4189 /* Undefined weak symbol is bound locally when
4190 PIC is false. */
4191 || h->root.type == bfd_link_hash_undefined)))
4192 {
4193 Elf_Internal_Rela outrel;
4194 bfd_boolean skip, relocate;
4195 asection *sreloc;
4196
4197 /* When generating a shared object, these relocations
4198 are copied into the output file to be resolved at run
4199 time. */
4200 skip = FALSE;
4201 relocate = FALSE;
4202
4203 outrel.r_offset =
4204 _bfd_elf_section_offset (output_bfd, info, input_section,
4205 rel->r_offset);
4206 if (outrel.r_offset == (bfd_vma) -1)
4207 skip = TRUE;
4208 else if (outrel.r_offset == (bfd_vma) -2)
4209 skip = TRUE, relocate = TRUE;
4210
4211 outrel.r_offset += (input_section->output_section->vma
4212 + input_section->output_offset);
4213
4214 if (skip)
4215 memset (&outrel, 0, sizeof outrel);
4216
4217 /* h->dynindx may be -1 if this symbol was marked to
4218 become local. */
4219 else if (h != NULL
4220 && h->dynindx != -1
4221 && (IS_X86_64_PCREL_TYPE (r_type)
4222 || !(bfd_link_executable (info)
4223 || SYMBOLIC_BIND (info, h))
4224 || ! h->def_regular))
4225 {
4226 outrel.r_info = htab->r_info (h->dynindx, r_type);
4227 outrel.r_addend = rel->r_addend;
4228 }
4229 else
4230 {
4231 /* This symbol is local, or marked to become local.
4232 When relocation overflow check is disabled, we
4233 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
4234 if (r_type == htab->pointer_r_type
4235 || (r_type == R_X86_64_32
4236 && info->no_reloc_overflow_check))
4237 {
4238 relocate = TRUE;
4239 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4240 outrel.r_addend = relocation + rel->r_addend;
4241 }
4242 else if (r_type == R_X86_64_64
4243 && !ABI_64_P (output_bfd))
4244 {
4245 relocate = TRUE;
4246 outrel.r_info = htab->r_info (0,
4247 R_X86_64_RELATIVE64);
4248 outrel.r_addend = relocation + rel->r_addend;
4249 /* Check addend overflow. */
4250 if ((outrel.r_addend & 0x80000000)
4251 != (rel->r_addend & 0x80000000))
4252 {
4253 const char *name;
4254 int addend = rel->r_addend;
4255 if (h && h->root.root.string)
4256 name = h->root.root.string;
4257 else
4258 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4259 sym, NULL);
4260 _bfd_error_handler
4261 /* xgettext:c-format */
4262 (_("%B: addend %s%#x in relocation %s against "
4263 "symbol `%s' at %#Lx in section `%A' is "
4264 "out of range"),
4265 input_bfd, addend < 0 ? "-" : "", addend,
4266 howto->name, name, rel->r_offset, input_section);
4267 bfd_set_error (bfd_error_bad_value);
4268 return FALSE;
4269 }
4270 }
4271 else
4272 {
4273 long sindx;
4274
4275 if (bfd_is_abs_section (sec))
4276 sindx = 0;
4277 else if (sec == NULL || sec->owner == NULL)
4278 {
4279 bfd_set_error (bfd_error_bad_value);
4280 return FALSE;
4281 }
4282 else
4283 {
4284 asection *osec;
4285
4286 /* We are turning this relocation into one
4287 against a section symbol. It would be
4288 proper to subtract the symbol's value,
4289 osec->vma, from the emitted reloc addend,
4290 but ld.so expects buggy relocs. */
4291 osec = sec->output_section;
4292 sindx = elf_section_data (osec)->dynindx;
4293 if (sindx == 0)
4294 {
4295 asection *oi = htab->elf.text_index_section;
4296 sindx = elf_section_data (oi)->dynindx;
4297 }
4298 BFD_ASSERT (sindx != 0);
4299 }
4300
4301 outrel.r_info = htab->r_info (sindx, r_type);
4302 outrel.r_addend = relocation + rel->r_addend;
4303 }
4304 }
4305
4306 sreloc = elf_section_data (input_section)->sreloc;
4307
4308 if (sreloc == NULL || sreloc->contents == NULL)
4309 {
4310 r = bfd_reloc_notsupported;
4311 goto check_relocation_error;
4312 }
4313
4314 elf_append_rela (output_bfd, sreloc, &outrel);
4315
4316 /* If this reloc is against an external symbol, we do
4317 not want to fiddle with the addend. Otherwise, we
4318 need to include the symbol value so that it becomes
4319 an addend for the dynamic reloc. */
4320 if (! relocate)
4321 continue;
4322 }
4323
4324 break;
4325
4326 case R_X86_64_TLSGD:
4327 case R_X86_64_GOTPC32_TLSDESC:
4328 case R_X86_64_TLSDESC_CALL:
4329 case R_X86_64_GOTTPOFF:
4330 tls_type = GOT_UNKNOWN;
4331 if (h == NULL && local_got_offsets)
4332 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
4333 else if (h != NULL)
4334 tls_type = elf_x86_hash_entry (h)->tls_type;
4335
4336 if (! elf_x86_64_tls_transition (info, input_bfd,
4337 input_section, contents,
4338 symtab_hdr, sym_hashes,
4339 &r_type, tls_type, rel,
4340 relend, h, r_symndx, TRUE))
4341 return FALSE;
4342
4343 if (r_type == R_X86_64_TPOFF32)
4344 {
4345 bfd_vma roff = rel->r_offset;
4346
4347 BFD_ASSERT (! unresolved_reloc);
4348
4349 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4350 {
4351 /* GD->LE transition. For 64bit, change
4352 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4353 .word 0x6666; rex64; call __tls_get_addr@PLT
4354 or
4355 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4356 .byte 0x66; rex64
4357 call *__tls_get_addr@GOTPCREL(%rip)
4358 which may be converted to
4359 addr32 call __tls_get_addr
4360 into:
4361 movq %fs:0, %rax
4362 leaq foo@tpoff(%rax), %rax
4363 For 32bit, change
4364 leaq foo@tlsgd(%rip), %rdi
4365 .word 0x6666; rex64; call __tls_get_addr@PLT
4366 or
4367 leaq foo@tlsgd(%rip), %rdi
4368 .byte 0x66; rex64
4369 call *__tls_get_addr@GOTPCREL(%rip)
4370 which may be converted to
4371 addr32 call __tls_get_addr
4372 into:
4373 movl %fs:0, %eax
4374 leaq foo@tpoff(%rax), %rax
4375 For largepic, change:
4376 leaq foo@tlsgd(%rip), %rdi
4377 movabsq $__tls_get_addr@pltoff, %rax
4378 addq %r15, %rax
4379 call *%rax
4380 into:
4381 movq %fs:0, %rax
4382 leaq foo@tpoff(%rax), %rax
4383 nopw 0x0(%rax,%rax,1) */
4384 int largepic = 0;
4385 if (ABI_64_P (output_bfd))
4386 {
4387 if (contents[roff + 5] == 0xb8)
4388 {
4389 memcpy (contents + roff - 3,
4390 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4391 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4392 largepic = 1;
4393 }
4394 else
4395 memcpy (contents + roff - 4,
4396 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4397 16);
4398 }
4399 else
4400 memcpy (contents + roff - 3,
4401 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4402 15);
4403 bfd_put_32 (output_bfd,
4404 elf_x86_64_tpoff (info, relocation),
4405 contents + roff + 8 + largepic);
4406 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
4407 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
4408 rel++;
4409 wrel++;
4410 continue;
4411 }
4412 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4413 {
4414 /* GDesc -> LE transition.
4415 It's originally something like:
4416 leaq x@tlsdesc(%rip), %rax
4417
4418 Change it to:
4419 movl $x@tpoff, %rax. */
4420
4421 unsigned int val, type;
4422
4423 type = bfd_get_8 (input_bfd, contents + roff - 3);
4424 val = bfd_get_8 (input_bfd, contents + roff - 1);
4425 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4426 contents + roff - 3);
4427 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4428 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4429 contents + roff - 1);
4430 bfd_put_32 (output_bfd,
4431 elf_x86_64_tpoff (info, relocation),
4432 contents + roff);
4433 continue;
4434 }
4435 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4436 {
4437 /* GDesc -> LE transition.
4438 It's originally:
4439 call *(%rax)
4440 Turn it into:
4441 xchg %ax,%ax. */
4442 bfd_put_8 (output_bfd, 0x66, contents + roff);
4443 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4444 continue;
4445 }
4446 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4447 {
4448 /* IE->LE transition:
4449 For 64bit, originally it can be one of:
4450 movq foo@gottpoff(%rip), %reg
4451 addq foo@gottpoff(%rip), %reg
4452 We change it into:
4453 movq $foo, %reg
4454 leaq foo(%reg), %reg
4455 addq $foo, %reg.
4456 For 32bit, originally it can be one of:
4457 movq foo@gottpoff(%rip), %reg
4458 addl foo@gottpoff(%rip), %reg
4459 We change it into:
4460 movq $foo, %reg
4461 leal foo(%reg), %reg
4462 addl $foo, %reg. */
4463
4464 unsigned int val, type, reg;
4465
4466 if (roff >= 3)
4467 val = bfd_get_8 (input_bfd, contents + roff - 3);
4468 else
4469 val = 0;
4470 type = bfd_get_8 (input_bfd, contents + roff - 2);
4471 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4472 reg >>= 3;
4473 if (type == 0x8b)
4474 {
4475 /* movq */
4476 if (val == 0x4c)
4477 bfd_put_8 (output_bfd, 0x49,
4478 contents + roff - 3);
4479 else if (!ABI_64_P (output_bfd) && val == 0x44)
4480 bfd_put_8 (output_bfd, 0x41,
4481 contents + roff - 3);
4482 bfd_put_8 (output_bfd, 0xc7,
4483 contents + roff - 2);
4484 bfd_put_8 (output_bfd, 0xc0 | reg,
4485 contents + roff - 1);
4486 }
4487 else if (reg == 4)
4488 {
4489 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4490 is special */
4491 if (val == 0x4c)
4492 bfd_put_8 (output_bfd, 0x49,
4493 contents + roff - 3);
4494 else if (!ABI_64_P (output_bfd) && val == 0x44)
4495 bfd_put_8 (output_bfd, 0x41,
4496 contents + roff - 3);
4497 bfd_put_8 (output_bfd, 0x81,
4498 contents + roff - 2);
4499 bfd_put_8 (output_bfd, 0xc0 | reg,
4500 contents + roff - 1);
4501 }
4502 else
4503 {
4504 /* addq/addl -> leaq/leal */
4505 if (val == 0x4c)
4506 bfd_put_8 (output_bfd, 0x4d,
4507 contents + roff - 3);
4508 else if (!ABI_64_P (output_bfd) && val == 0x44)
4509 bfd_put_8 (output_bfd, 0x45,
4510 contents + roff - 3);
4511 bfd_put_8 (output_bfd, 0x8d,
4512 contents + roff - 2);
4513 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4514 contents + roff - 1);
4515 }
4516 bfd_put_32 (output_bfd,
4517 elf_x86_64_tpoff (info, relocation),
4518 contents + roff);
4519 continue;
4520 }
4521 else
4522 BFD_ASSERT (FALSE);
4523 }
4524
4525 if (htab->elf.sgot == NULL)
4526 abort ();
4527
4528 if (h != NULL)
4529 {
4530 off = h->got.offset;
4531 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
4532 }
4533 else
4534 {
4535 if (local_got_offsets == NULL)
4536 abort ();
4537
4538 off = local_got_offsets[r_symndx];
4539 offplt = local_tlsdesc_gotents[r_symndx];
4540 }
4541
4542 if ((off & 1) != 0)
4543 off &= ~1;
4544 else
4545 {
4546 Elf_Internal_Rela outrel;
4547 int dr_type, indx;
4548 asection *sreloc;
4549
4550 if (htab->elf.srelgot == NULL)
4551 abort ();
4552
4553 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4554
4555 if (GOT_TLS_GDESC_P (tls_type))
4556 {
4557 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4558 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4559 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4560 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4561 + htab->elf.sgotplt->output_offset
4562 + offplt
4563 + htab->sgotplt_jump_table_size);
4564 sreloc = htab->elf.srelplt;
4565 if (indx == 0)
4566 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info);
4567 else
4568 outrel.r_addend = 0;
4569 elf_append_rela (output_bfd, sreloc, &outrel);
4570 }
4571
4572 sreloc = htab->elf.srelgot;
4573
4574 outrel.r_offset = (htab->elf.sgot->output_section->vma
4575 + htab->elf.sgot->output_offset + off);
4576
4577 if (GOT_TLS_GD_P (tls_type))
4578 dr_type = R_X86_64_DTPMOD64;
4579 else if (GOT_TLS_GDESC_P (tls_type))
4580 goto dr_done;
4581 else
4582 dr_type = R_X86_64_TPOFF64;
4583
4584 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4585 outrel.r_addend = 0;
4586 if ((dr_type == R_X86_64_TPOFF64
4587 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4588 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info);
4589 outrel.r_info = htab->r_info (indx, dr_type);
4590
4591 elf_append_rela (output_bfd, sreloc, &outrel);
4592
4593 if (GOT_TLS_GD_P (tls_type))
4594 {
4595 if (indx == 0)
4596 {
4597 BFD_ASSERT (! unresolved_reloc);
4598 bfd_put_64 (output_bfd,
4599 relocation - _bfd_x86_elf_dtpoff_base (info),
4600 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4601 }
4602 else
4603 {
4604 bfd_put_64 (output_bfd, 0,
4605 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4606 outrel.r_info = htab->r_info (indx,
4607 R_X86_64_DTPOFF64);
4608 outrel.r_offset += GOT_ENTRY_SIZE;
4609 elf_append_rela (output_bfd, sreloc,
4610 &outrel);
4611 }
4612 }
4613
4614 dr_done:
4615 if (h != NULL)
4616 h->got.offset |= 1;
4617 else
4618 local_got_offsets[r_symndx] |= 1;
4619 }
4620
4621 if (off >= (bfd_vma) -2
4622 && ! GOT_TLS_GDESC_P (tls_type))
4623 abort ();
4624 if (r_type == ELF32_R_TYPE (rel->r_info))
4625 {
4626 if (r_type == R_X86_64_GOTPC32_TLSDESC
4627 || r_type == R_X86_64_TLSDESC_CALL)
4628 relocation = htab->elf.sgotplt->output_section->vma
4629 + htab->elf.sgotplt->output_offset
4630 + offplt + htab->sgotplt_jump_table_size;
4631 else
4632 relocation = htab->elf.sgot->output_section->vma
4633 + htab->elf.sgot->output_offset + off;
4634 unresolved_reloc = FALSE;
4635 }
4636 else
4637 {
4638 bfd_vma roff = rel->r_offset;
4639
4640 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4641 {
4642 /* GD->IE transition. For 64bit, change
4643 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4644 .word 0x6666; rex64; call __tls_get_addr@PLT
4645 or
4646 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4647 .byte 0x66; rex64
4648 call *__tls_get_addr@GOTPCREL(%rip
4649 which may be converted to
4650 addr32 call __tls_get_addr
4651 into:
4652 movq %fs:0, %rax
4653 addq foo@gottpoff(%rip), %rax
4654 For 32bit, change
4655 leaq foo@tlsgd(%rip), %rdi
4656 .word 0x6666; rex64; call __tls_get_addr@PLT
4657 or
4658 leaq foo@tlsgd(%rip), %rdi
4659 .byte 0x66; rex64;
4660 call *__tls_get_addr@GOTPCREL(%rip)
4661 which may be converted to
4662 addr32 call __tls_get_addr
4663 into:
4664 movl %fs:0, %eax
4665 addq foo@gottpoff(%rip), %rax
4666 For largepic, change:
4667 leaq foo@tlsgd(%rip), %rdi
4668 movabsq $__tls_get_addr@pltoff, %rax
4669 addq %r15, %rax
4670 call *%rax
4671 into:
4672 movq %fs:0, %rax
4673 addq foo@gottpoff(%rax), %rax
4674 nopw 0x0(%rax,%rax,1) */
4675 int largepic = 0;
4676 if (ABI_64_P (output_bfd))
4677 {
4678 if (contents[roff + 5] == 0xb8)
4679 {
4680 memcpy (contents + roff - 3,
4681 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4682 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4683 largepic = 1;
4684 }
4685 else
4686 memcpy (contents + roff - 4,
4687 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4688 16);
4689 }
4690 else
4691 memcpy (contents + roff - 3,
4692 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4693 15);
4694
4695 relocation = (htab->elf.sgot->output_section->vma
4696 + htab->elf.sgot->output_offset + off
4697 - roff
4698 - largepic
4699 - input_section->output_section->vma
4700 - input_section->output_offset
4701 - 12);
4702 bfd_put_32 (output_bfd, relocation,
4703 contents + roff + 8 + largepic);
4704 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4705 rel++;
4706 wrel++;
4707 continue;
4708 }
4709 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4710 {
4711 /* GDesc -> IE transition.
4712 It's originally something like:
4713 leaq x@tlsdesc(%rip), %rax
4714
4715 Change it to:
4716 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4717
4718 /* Now modify the instruction as appropriate. To
4719 turn a leaq into a movq in the form we use it, it
4720 suffices to change the second byte from 0x8d to
4721 0x8b. */
4722 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4723
4724 bfd_put_32 (output_bfd,
4725 htab->elf.sgot->output_section->vma
4726 + htab->elf.sgot->output_offset + off
4727 - rel->r_offset
4728 - input_section->output_section->vma
4729 - input_section->output_offset
4730 - 4,
4731 contents + roff);
4732 continue;
4733 }
4734 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4735 {
4736 /* GDesc -> IE transition.
4737 It's originally:
4738 call *(%rax)
4739
4740 Change it to:
4741 xchg %ax, %ax. */
4742
4743 bfd_put_8 (output_bfd, 0x66, contents + roff);
4744 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4745 continue;
4746 }
4747 else
4748 BFD_ASSERT (FALSE);
4749 }
4750 break;
4751
4752 case R_X86_64_TLSLD:
4753 if (! elf_x86_64_tls_transition (info, input_bfd,
4754 input_section, contents,
4755 symtab_hdr, sym_hashes,
4756 &r_type, GOT_UNKNOWN, rel,
4757 relend, h, r_symndx, TRUE))
4758 return FALSE;
4759
4760 if (r_type != R_X86_64_TLSLD)
4761 {
4762 /* LD->LE transition:
4763 leaq foo@tlsld(%rip), %rdi
4764 call __tls_get_addr@PLT
4765 For 64bit, we change it into:
4766 .word 0x6666; .byte 0x66; movq %fs:0, %rax
4767 For 32bit, we change it into:
4768 nopl 0x0(%rax); movl %fs:0, %eax
4769 Or
4770 leaq foo@tlsld(%rip), %rdi;
4771 call *__tls_get_addr@GOTPCREL(%rip)
4772 which may be converted to
4773 addr32 call __tls_get_addr
4774 For 64bit, we change it into:
4775 .word 0x6666; .word 0x6666; movq %fs:0, %rax
4776 For 32bit, we change it into:
4777 nopw 0x0(%rax); movl %fs:0, %eax
4778 For largepic, change:
4779 leaq foo@tlsgd(%rip), %rdi
4780 movabsq $__tls_get_addr@pltoff, %rax
4781 addq %rbx, %rax
4782 call *%rax
4783 into
4784 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
4785 movq %fs:0, %eax */
4786
4787 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
4788 if (ABI_64_P (output_bfd))
4789 {
4790 if (contents[rel->r_offset + 5] == 0xb8)
4791 memcpy (contents + rel->r_offset - 3,
4792 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
4793 "\x64\x48\x8b\x04\x25\0\0\0", 22);
4794 else if (contents[rel->r_offset + 4] == 0xff
4795 || contents[rel->r_offset + 4] == 0x67)
4796 memcpy (contents + rel->r_offset - 3,
4797 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
4798 13);
4799 else
4800 memcpy (contents + rel->r_offset - 3,
4801 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
4802 }
4803 else
4804 {
4805 if (contents[rel->r_offset + 4] == 0xff)
4806 memcpy (contents + rel->r_offset - 3,
4807 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
4808 13);
4809 else
4810 memcpy (contents + rel->r_offset - 3,
4811 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4812 }
4813 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
4814 and R_X86_64_PLTOFF64. */
4815 rel++;
4816 wrel++;
4817 continue;
4818 }
4819
4820 if (htab->elf.sgot == NULL)
4821 abort ();
4822
4823 off = htab->tls_ld_or_ldm_got.offset;
4824 if (off & 1)
4825 off &= ~1;
4826 else
4827 {
4828 Elf_Internal_Rela outrel;
4829
4830 if (htab->elf.srelgot == NULL)
4831 abort ();
4832
4833 outrel.r_offset = (htab->elf.sgot->output_section->vma
4834 + htab->elf.sgot->output_offset + off);
4835
4836 bfd_put_64 (output_bfd, 0,
4837 htab->elf.sgot->contents + off);
4838 bfd_put_64 (output_bfd, 0,
4839 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4840 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
4841 outrel.r_addend = 0;
4842 elf_append_rela (output_bfd, htab->elf.srelgot,
4843 &outrel);
4844 htab->tls_ld_or_ldm_got.offset |= 1;
4845 }
4846 relocation = htab->elf.sgot->output_section->vma
4847 + htab->elf.sgot->output_offset + off;
4848 unresolved_reloc = FALSE;
4849 break;
4850
4851 case R_X86_64_DTPOFF32:
4852 if (!bfd_link_executable (info)
4853 || (input_section->flags & SEC_CODE) == 0)
4854 relocation -= _bfd_x86_elf_dtpoff_base (info);
4855 else
4856 relocation = elf_x86_64_tpoff (info, relocation);
4857 break;
4858
4859 case R_X86_64_TPOFF32:
4860 case R_X86_64_TPOFF64:
4861 BFD_ASSERT (bfd_link_executable (info));
4862 relocation = elf_x86_64_tpoff (info, relocation);
4863 break;
4864
4865 case R_X86_64_DTPOFF64:
4866 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
4867 relocation -= _bfd_x86_elf_dtpoff_base (info);
4868 break;
4869
4870 default:
4871 break;
4872 }
4873
4874 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4875 because such sections are not SEC_ALLOC and thus ld.so will
4876 not process them. */
4877 if (unresolved_reloc
4878 && !((input_section->flags & SEC_DEBUGGING) != 0
4879 && h->def_dynamic)
4880 && _bfd_elf_section_offset (output_bfd, info, input_section,
4881 rel->r_offset) != (bfd_vma) -1)
4882 {
4883 switch (r_type)
4884 {
4885 case R_X86_64_32S:
4886 sec = h->root.u.def.section;
4887 if ((info->nocopyreloc
4888 || (eh->def_protected
4889 && elf_has_no_copy_on_protected (h->root.u.def.section->owner)))
4890 && !(h->root.u.def.section->flags & SEC_CODE))
4891 return elf_x86_64_need_pic (info, input_bfd, input_section,
4892 h, NULL, NULL, howto);
4893 /* Fall through. */
4894
4895 default:
4896 _bfd_error_handler
4897 /* xgettext:c-format */
4898 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
4899 input_bfd,
4900 input_section,
4901 rel->r_offset,
4902 howto->name,
4903 h->root.root.string);
4904 return FALSE;
4905 }
4906 }
4907
4908 do_relocation:
4909 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4910 contents, rel->r_offset,
4911 relocation, rel->r_addend);
4912
4913 check_relocation_error:
4914 if (r != bfd_reloc_ok)
4915 {
4916 const char *name;
4917
4918 if (h != NULL)
4919 name = h->root.root.string;
4920 else
4921 {
4922 name = bfd_elf_string_from_elf_section (input_bfd,
4923 symtab_hdr->sh_link,
4924 sym->st_name);
4925 if (name == NULL)
4926 return FALSE;
4927 if (*name == '\0')
4928 name = bfd_section_name (input_bfd, sec);
4929 }
4930
4931 if (r == bfd_reloc_overflow)
4932 (*info->callbacks->reloc_overflow)
4933 (info, (h ? &h->root : NULL), name, howto->name,
4934 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
4935 else
4936 {
4937 _bfd_error_handler
4938 /* xgettext:c-format */
4939 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
4940 input_bfd, input_section,
4941 rel->r_offset, name, (int) r);
4942 return FALSE;
4943 }
4944 }
4945
4946 if (wrel != rel)
4947 *wrel = *rel;
4948 }
4949
4950 if (wrel != rel)
4951 {
4952 Elf_Internal_Shdr *rel_hdr;
4953 size_t deleted = rel - wrel;
4954
4955 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
4956 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
4957 if (rel_hdr->sh_size == 0)
4958 {
4959 /* It is too late to remove an empty reloc section. Leave
4960 one NONE reloc.
4961 ??? What is wrong with an empty section??? */
4962 rel_hdr->sh_size = rel_hdr->sh_entsize;
4963 deleted -= 1;
4964 }
4965 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
4966 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
4967 input_section->reloc_count -= deleted;
4968 }
4969
4970 return TRUE;
4971 }
4972
4973 /* Finish up dynamic symbol handling. We set the contents of various
4974 dynamic sections here. */
4975
4976 static bfd_boolean
4977 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
4978 struct bfd_link_info *info,
4979 struct elf_link_hash_entry *h,
4980 Elf_Internal_Sym *sym)
4981 {
4982 struct elf_x86_link_hash_table *htab;
4983 bfd_boolean use_plt_second;
4984 struct elf_x86_link_hash_entry *eh;
4985 bfd_boolean local_undefweak;
4986
4987 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
4988 if (htab == NULL)
4989 return FALSE;
4990
4991 /* Use the second PLT section only if there is .plt section. */
4992 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
4993
4994 eh = (struct elf_x86_link_hash_entry *) h;
4995 if (eh->no_finish_dynamic_symbol)
4996 abort ();
4997
4998 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
4999 resolved undefined weak symbols in executable so that their
5000 references have value 0 at run-time. */
5001 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5002 X86_64_ELF_DATA,
5003 eh->has_got_reloc,
5004 eh);
5005
5006 if (h->plt.offset != (bfd_vma) -1)
5007 {
5008 bfd_vma plt_index;
5009 bfd_vma got_offset, plt_offset;
5010 Elf_Internal_Rela rela;
5011 bfd_byte *loc;
5012 asection *plt, *gotplt, *relplt, *resolved_plt;
5013 const struct elf_backend_data *bed;
5014 bfd_vma plt_got_pcrel_offset;
5015
5016 /* When building a static executable, use .iplt, .igot.plt and
5017 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5018 if (htab->elf.splt != NULL)
5019 {
5020 plt = htab->elf.splt;
5021 gotplt = htab->elf.sgotplt;
5022 relplt = htab->elf.srelplt;
5023 }
5024 else
5025 {
5026 plt = htab->elf.iplt;
5027 gotplt = htab->elf.igotplt;
5028 relplt = htab->elf.irelplt;
5029 }
5030
5031 /* This symbol has an entry in the procedure linkage table. Set
5032 it up. */
5033 if ((h->dynindx == -1
5034 && !local_undefweak
5035 && !((h->forced_local || bfd_link_executable (info))
5036 && h->def_regular
5037 && h->type == STT_GNU_IFUNC))
5038 || plt == NULL
5039 || gotplt == NULL
5040 || relplt == NULL)
5041 abort ();
5042
5043 /* Get the index in the procedure linkage table which
5044 corresponds to this symbol. This is the index of this symbol
5045 in all the symbols for which we are making plt entries. The
5046 first entry in the procedure linkage table is reserved.
5047
5048 Get the offset into the .got table of the entry that
5049 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5050 bytes. The first three are reserved for the dynamic linker.
5051
5052 For static executables, we don't reserve anything. */
5053
5054 if (plt == htab->elf.splt)
5055 {
5056 got_offset = (h->plt.offset / htab->plt.plt_entry_size
5057 - htab->plt.has_plt0);
5058 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
5059 }
5060 else
5061 {
5062 got_offset = h->plt.offset / htab->plt.plt_entry_size;
5063 got_offset = got_offset * GOT_ENTRY_SIZE;
5064 }
5065
5066 /* Fill in the entry in the procedure linkage table. */
5067 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
5068 htab->plt.plt_entry_size);
5069 if (use_plt_second)
5070 {
5071 memcpy (htab->plt_second->contents + eh->plt_second.offset,
5072 htab->non_lazy_plt->plt_entry,
5073 htab->non_lazy_plt->plt_entry_size);
5074
5075 resolved_plt = htab->plt_second;
5076 plt_offset = eh->plt_second.offset;
5077 }
5078 else
5079 {
5080 resolved_plt = plt;
5081 plt_offset = h->plt.offset;
5082 }
5083
5084 /* Insert the relocation positions of the plt section. */
5085
5086 /* Put offset the PC-relative instruction referring to the GOT entry,
5087 subtracting the size of that instruction. */
5088 plt_got_pcrel_offset = (gotplt->output_section->vma
5089 + gotplt->output_offset
5090 + got_offset
5091 - resolved_plt->output_section->vma
5092 - resolved_plt->output_offset
5093 - plt_offset
5094 - htab->plt.plt_got_insn_size);
5095
5096 /* Check PC-relative offset overflow in PLT entry. */
5097 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5098 /* xgettext:c-format */
5099 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5100 output_bfd, h->root.root.string);
5101
5102 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5103 (resolved_plt->contents + plt_offset
5104 + htab->plt.plt_got_offset));
5105
5106 /* Fill in the entry in the global offset table, initially this
5107 points to the second part of the PLT entry. Leave the entry
5108 as zero for undefined weak symbol in PIE. No PLT relocation
5109 against undefined weak symbol in PIE. */
5110 if (!local_undefweak)
5111 {
5112 if (htab->plt.has_plt0)
5113 bfd_put_64 (output_bfd, (plt->output_section->vma
5114 + plt->output_offset
5115 + h->plt.offset
5116 + htab->lazy_plt->plt_lazy_offset),
5117 gotplt->contents + got_offset);
5118
5119 /* Fill in the entry in the .rela.plt section. */
5120 rela.r_offset = (gotplt->output_section->vma
5121 + gotplt->output_offset
5122 + got_offset);
5123 if (h->dynindx == -1
5124 || ((bfd_link_executable (info)
5125 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5126 && h->def_regular
5127 && h->type == STT_GNU_IFUNC))
5128 {
5129 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
5130 h->root.root.string,
5131 h->root.u.def.section->owner);
5132
5133 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5134 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5135 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5136 rela.r_addend = (h->root.u.def.value
5137 + h->root.u.def.section->output_section->vma
5138 + h->root.u.def.section->output_offset);
5139 /* R_X86_64_IRELATIVE comes last. */
5140 plt_index = htab->next_irelative_index--;
5141 }
5142 else
5143 {
5144 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5145 rela.r_addend = 0;
5146 plt_index = htab->next_jump_slot_index++;
5147 }
5148
5149 /* Don't fill the second and third slots in PLT entry for
5150 static executables nor without PLT0. */
5151 if (plt == htab->elf.splt && htab->plt.has_plt0)
5152 {
5153 bfd_vma plt0_offset
5154 = h->plt.offset + htab->lazy_plt->plt_plt_insn_end;
5155
5156 /* Put relocation index. */
5157 bfd_put_32 (output_bfd, plt_index,
5158 (plt->contents + h->plt.offset
5159 + htab->lazy_plt->plt_reloc_offset));
5160
5161 /* Put offset for jmp .PLT0 and check for overflow. We don't
5162 check relocation index for overflow since branch displacement
5163 will overflow first. */
5164 if (plt0_offset > 0x80000000)
5165 /* xgettext:c-format */
5166 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5167 output_bfd, h->root.root.string);
5168 bfd_put_32 (output_bfd, - plt0_offset,
5169 (plt->contents + h->plt.offset
5170 + htab->lazy_plt->plt_plt_offset));
5171 }
5172
5173 bed = get_elf_backend_data (output_bfd);
5174 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5175 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5176 }
5177 }
5178 else if (eh->plt_got.offset != (bfd_vma) -1)
5179 {
5180 bfd_vma got_offset, plt_offset;
5181 asection *plt, *got;
5182 bfd_boolean got_after_plt;
5183 int32_t got_pcrel_offset;
5184
5185 /* Set the entry in the GOT procedure linkage table. */
5186 plt = htab->plt_got;
5187 got = htab->elf.sgot;
5188 got_offset = h->got.offset;
5189
5190 if (got_offset == (bfd_vma) -1
5191 || (h->type == STT_GNU_IFUNC && h->def_regular)
5192 || plt == NULL
5193 || got == NULL)
5194 abort ();
5195
5196 /* Use the non-lazy PLT entry template for the GOT PLT since they
5197 are the identical. */
5198 /* Fill in the entry in the GOT procedure linkage table. */
5199 plt_offset = eh->plt_got.offset;
5200 memcpy (plt->contents + plt_offset,
5201 htab->non_lazy_plt->plt_entry,
5202 htab->non_lazy_plt->plt_entry_size);
5203
5204 /* Put offset the PC-relative instruction referring to the GOT
5205 entry, subtracting the size of that instruction. */
5206 got_pcrel_offset = (got->output_section->vma
5207 + got->output_offset
5208 + got_offset
5209 - plt->output_section->vma
5210 - plt->output_offset
5211 - plt_offset
5212 - htab->non_lazy_plt->plt_got_insn_size);
5213
5214 /* Check PC-relative offset overflow in GOT PLT entry. */
5215 got_after_plt = got->output_section->vma > plt->output_section->vma;
5216 if ((got_after_plt && got_pcrel_offset < 0)
5217 || (!got_after_plt && got_pcrel_offset > 0))
5218 /* xgettext:c-format */
5219 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5220 output_bfd, h->root.root.string);
5221
5222 bfd_put_32 (output_bfd, got_pcrel_offset,
5223 (plt->contents + plt_offset
5224 + htab->non_lazy_plt->plt_got_offset));
5225 }
5226
5227 if (!local_undefweak
5228 && !h->def_regular
5229 && (h->plt.offset != (bfd_vma) -1
5230 || eh->plt_got.offset != (bfd_vma) -1))
5231 {
5232 /* Mark the symbol as undefined, rather than as defined in
5233 the .plt section. Leave the value if there were any
5234 relocations where pointer equality matters (this is a clue
5235 for the dynamic linker, to make function pointer
5236 comparisons work between an application and shared
5237 library), otherwise set it to zero. If a function is only
5238 called from a binary, there is no need to slow down
5239 shared libraries because of that. */
5240 sym->st_shndx = SHN_UNDEF;
5241 if (!h->pointer_equality_needed)
5242 sym->st_value = 0;
5243 }
5244
5245 /* Don't generate dynamic GOT relocation against undefined weak
5246 symbol in executable. */
5247 if (h->got.offset != (bfd_vma) -1
5248 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h)->tls_type)
5249 && elf_x86_hash_entry (h)->tls_type != GOT_TLS_IE
5250 && !local_undefweak)
5251 {
5252 Elf_Internal_Rela rela;
5253 asection *relgot = htab->elf.srelgot;
5254
5255 /* This symbol has an entry in the global offset table. Set it
5256 up. */
5257 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5258 abort ();
5259
5260 rela.r_offset = (htab->elf.sgot->output_section->vma
5261 + htab->elf.sgot->output_offset
5262 + (h->got.offset &~ (bfd_vma) 1));
5263
5264 /* If this is a static link, or it is a -Bsymbolic link and the
5265 symbol is defined locally or was forced to be local because
5266 of a version file, we just want to emit a RELATIVE reloc.
5267 The entry in the global offset table will already have been
5268 initialized in the relocate_section function. */
5269 if (h->def_regular
5270 && h->type == STT_GNU_IFUNC)
5271 {
5272 if (h->plt.offset == (bfd_vma) -1)
5273 {
5274 /* STT_GNU_IFUNC is referenced without PLT. */
5275 if (htab->elf.splt == NULL)
5276 {
5277 /* use .rel[a].iplt section to store .got relocations
5278 in static executable. */
5279 relgot = htab->elf.irelplt;
5280 }
5281 if (SYMBOL_REFERENCES_LOCAL (info, h))
5282 {
5283 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
5284 output_bfd,
5285 h->root.root.string,
5286 h->root.u.def.section->owner);
5287
5288 rela.r_info = htab->r_info (0,
5289 R_X86_64_IRELATIVE);
5290 rela.r_addend = (h->root.u.def.value
5291 + h->root.u.def.section->output_section->vma
5292 + h->root.u.def.section->output_offset);
5293 }
5294 else
5295 goto do_glob_dat;
5296 }
5297 else if (bfd_link_pic (info))
5298 {
5299 /* Generate R_X86_64_GLOB_DAT. */
5300 goto do_glob_dat;
5301 }
5302 else
5303 {
5304 asection *plt;
5305 bfd_vma plt_offset;
5306
5307 if (!h->pointer_equality_needed)
5308 abort ();
5309
5310 /* For non-shared object, we can't use .got.plt, which
5311 contains the real function addres if we need pointer
5312 equality. We load the GOT entry with the PLT entry. */
5313 if (htab->plt_second != NULL)
5314 {
5315 plt = htab->plt_second;
5316 plt_offset = eh->plt_second.offset;
5317 }
5318 else
5319 {
5320 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5321 plt_offset = h->plt.offset;
5322 }
5323 bfd_put_64 (output_bfd, (plt->output_section->vma
5324 + plt->output_offset
5325 + plt_offset),
5326 htab->elf.sgot->contents + h->got.offset);
5327 return TRUE;
5328 }
5329 }
5330 else if (bfd_link_pic (info)
5331 && SYMBOL_REFERENCES_LOCAL (info, h))
5332 {
5333 if (!h->def_regular)
5334 return FALSE;
5335 BFD_ASSERT((h->got.offset & 1) != 0);
5336 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5337 rela.r_addend = (h->root.u.def.value
5338 + h->root.u.def.section->output_section->vma
5339 + h->root.u.def.section->output_offset);
5340 }
5341 else
5342 {
5343 BFD_ASSERT((h->got.offset & 1) == 0);
5344 do_glob_dat:
5345 bfd_put_64 (output_bfd, (bfd_vma) 0,
5346 htab->elf.sgot->contents + h->got.offset);
5347 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5348 rela.r_addend = 0;
5349 }
5350
5351 elf_append_rela (output_bfd, relgot, &rela);
5352 }
5353
5354 if (h->needs_copy)
5355 {
5356 Elf_Internal_Rela rela;
5357 asection *s;
5358
5359 /* This symbol needs a copy reloc. Set it up. */
5360
5361 if (h->dynindx == -1
5362 || (h->root.type != bfd_link_hash_defined
5363 && h->root.type != bfd_link_hash_defweak)
5364 || htab->elf.srelbss == NULL
5365 || htab->elf.sreldynrelro == NULL)
5366 abort ();
5367
5368 rela.r_offset = (h->root.u.def.value
5369 + h->root.u.def.section->output_section->vma
5370 + h->root.u.def.section->output_offset);
5371 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5372 rela.r_addend = 0;
5373 if (h->root.u.def.section == htab->elf.sdynrelro)
5374 s = htab->elf.sreldynrelro;
5375 else
5376 s = htab->elf.srelbss;
5377 elf_append_rela (output_bfd, s, &rela);
5378 }
5379
5380 return TRUE;
5381 }
5382
5383 /* Finish up local dynamic symbol handling. We set the contents of
5384 various dynamic sections here. */
5385
5386 static bfd_boolean
5387 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5388 {
5389 struct elf_link_hash_entry *h
5390 = (struct elf_link_hash_entry *) *slot;
5391 struct bfd_link_info *info
5392 = (struct bfd_link_info *) inf;
5393
5394 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5395 info, h, NULL);
5396 }
5397
5398 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5399 here since undefined weak symbol may not be dynamic and may not be
5400 called for elf_x86_64_finish_dynamic_symbol. */
5401
5402 static bfd_boolean
5403 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5404 void *inf)
5405 {
5406 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5407 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5408
5409 if (h->root.type != bfd_link_hash_undefweak
5410 || h->dynindx != -1)
5411 return TRUE;
5412
5413 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5414 info, h, NULL);
5415 }
5416
5417 /* Used to decide how to sort relocs in an optimal manner for the
5418 dynamic linker, before writing them out. */
5419
5420 static enum elf_reloc_type_class
5421 elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
5422 const asection *rel_sec ATTRIBUTE_UNUSED,
5423 const Elf_Internal_Rela *rela)
5424 {
5425 bfd *abfd = info->output_bfd;
5426 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5427 struct elf_x86_link_hash_table *htab
5428 = elf_x86_hash_table (info, X86_64_ELF_DATA);
5429
5430 if (htab->elf.dynsym != NULL
5431 && htab->elf.dynsym->contents != NULL)
5432 {
5433 /* Check relocation against STT_GNU_IFUNC symbol if there are
5434 dynamic symbols. */
5435 unsigned long r_symndx = htab->r_sym (rela->r_info);
5436 if (r_symndx != STN_UNDEF)
5437 {
5438 Elf_Internal_Sym sym;
5439 if (!bed->s->swap_symbol_in (abfd,
5440 (htab->elf.dynsym->contents
5441 + r_symndx * bed->s->sizeof_sym),
5442 0, &sym))
5443 abort ();
5444
5445 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5446 return reloc_class_ifunc;
5447 }
5448 }
5449
5450 switch ((int) ELF32_R_TYPE (rela->r_info))
5451 {
5452 case R_X86_64_IRELATIVE:
5453 return reloc_class_ifunc;
5454 case R_X86_64_RELATIVE:
5455 case R_X86_64_RELATIVE64:
5456 return reloc_class_relative;
5457 case R_X86_64_JUMP_SLOT:
5458 return reloc_class_plt;
5459 case R_X86_64_COPY:
5460 return reloc_class_copy;
5461 default:
5462 return reloc_class_normal;
5463 }
5464 }
5465
5466 /* Finish up the dynamic sections. */
5467
5468 static bfd_boolean
5469 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5470 struct bfd_link_info *info)
5471 {
5472 struct elf_x86_link_hash_table *htab;
5473 bfd *dynobj;
5474 asection *sdyn;
5475
5476 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
5477 if (htab == NULL)
5478 return FALSE;
5479
5480 dynobj = htab->elf.dynobj;
5481 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5482
5483 if (htab->elf.dynamic_sections_created)
5484 {
5485 bfd_byte *dyncon, *dynconend;
5486 const struct elf_backend_data *bed;
5487 bfd_size_type sizeof_dyn;
5488
5489 if (sdyn == NULL || htab->elf.sgot == NULL)
5490 abort ();
5491
5492 bed = get_elf_backend_data (dynobj);
5493 sizeof_dyn = bed->s->sizeof_dyn;
5494 dyncon = sdyn->contents;
5495 dynconend = sdyn->contents + sdyn->size;
5496 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5497 {
5498 Elf_Internal_Dyn dyn;
5499 asection *s;
5500
5501 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5502
5503 switch (dyn.d_tag)
5504 {
5505 default:
5506 continue;
5507
5508 case DT_PLTGOT:
5509 s = htab->elf.sgotplt;
5510 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5511 break;
5512
5513 case DT_JMPREL:
5514 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5515 break;
5516
5517 case DT_PLTRELSZ:
5518 s = htab->elf.srelplt->output_section;
5519 dyn.d_un.d_val = s->size;
5520 break;
5521
5522 case DT_TLSDESC_PLT:
5523 s = htab->elf.splt;
5524 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5525 + htab->tlsdesc_plt;
5526 break;
5527
5528 case DT_TLSDESC_GOT:
5529 s = htab->elf.sgot;
5530 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5531 + htab->tlsdesc_got;
5532 break;
5533 }
5534
5535 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5536 }
5537
5538 if (htab->elf.splt && htab->elf.splt->size > 0)
5539 {
5540 elf_section_data (htab->elf.splt->output_section)
5541 ->this_hdr.sh_entsize = htab->plt.plt_entry_size;
5542
5543 if (htab->plt.has_plt0)
5544 {
5545 /* Fill in the special first entry in the procedure linkage
5546 table. */
5547 memcpy (htab->elf.splt->contents,
5548 htab->lazy_plt->plt0_entry,
5549 htab->lazy_plt->plt0_entry_size);
5550 /* Add offset for pushq GOT+8(%rip), since the instruction
5551 uses 6 bytes subtract this value. */
5552 bfd_put_32 (output_bfd,
5553 (htab->elf.sgotplt->output_section->vma
5554 + htab->elf.sgotplt->output_offset
5555 + 8
5556 - htab->elf.splt->output_section->vma
5557 - htab->elf.splt->output_offset
5558 - 6),
5559 (htab->elf.splt->contents
5560 + htab->lazy_plt->plt0_got1_offset));
5561 /* Add offset for the PC-relative instruction accessing
5562 GOT+16, subtracting the offset to the end of that
5563 instruction. */
5564 bfd_put_32 (output_bfd,
5565 (htab->elf.sgotplt->output_section->vma
5566 + htab->elf.sgotplt->output_offset
5567 + 16
5568 - htab->elf.splt->output_section->vma
5569 - htab->elf.splt->output_offset
5570 - htab->lazy_plt->plt0_got2_insn_end),
5571 (htab->elf.splt->contents
5572 + htab->lazy_plt->plt0_got2_offset));
5573
5574 if (htab->tlsdesc_plt)
5575 {
5576 bfd_put_64 (output_bfd, (bfd_vma) 0,
5577 htab->elf.sgot->contents + htab->tlsdesc_got);
5578
5579 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
5580 htab->lazy_plt->plt0_entry,
5581 htab->lazy_plt->plt0_entry_size);
5582
5583 /* Add offset for pushq GOT+8(%rip), since the
5584 instruction uses 6 bytes subtract this value. */
5585 bfd_put_32 (output_bfd,
5586 (htab->elf.sgotplt->output_section->vma
5587 + htab->elf.sgotplt->output_offset
5588 + 8
5589 - htab->elf.splt->output_section->vma
5590 - htab->elf.splt->output_offset
5591 - htab->tlsdesc_plt
5592 - 6),
5593 (htab->elf.splt->contents
5594 + htab->tlsdesc_plt
5595 + htab->lazy_plt->plt0_got1_offset));
5596 /* Add offset for the PC-relative instruction accessing
5597 GOT+TDG, where TDG stands for htab->tlsdesc_got,
5598 subtracting the offset to the end of that
5599 instruction. */
5600 bfd_put_32 (output_bfd,
5601 (htab->elf.sgot->output_section->vma
5602 + htab->elf.sgot->output_offset
5603 + htab->tlsdesc_got
5604 - htab->elf.splt->output_section->vma
5605 - htab->elf.splt->output_offset
5606 - htab->tlsdesc_plt
5607 - htab->lazy_plt->plt0_got2_insn_end),
5608 (htab->elf.splt->contents
5609 + htab->tlsdesc_plt
5610 + htab->lazy_plt->plt0_got2_offset));
5611 }
5612 }
5613 }
5614
5615 if (htab->plt_got != NULL && htab->plt_got->size > 0)
5616 elf_section_data (htab->plt_got->output_section)
5617 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
5618
5619 if (htab->plt_second != NULL && htab->plt_second->size > 0)
5620 elf_section_data (htab->plt_second->output_section)
5621 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
5622 }
5623
5624 /* GOT is always created in setup_gnu_properties. But it may not be
5625 needed. */
5626 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
5627 {
5628 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5629 {
5630 _bfd_error_handler
5631 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5632 return FALSE;
5633 }
5634
5635 /* Set the first entry in the global offset table to the address of
5636 the dynamic section. */
5637 if (sdyn == NULL)
5638 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
5639 else
5640 bfd_put_64 (output_bfd,
5641 sdyn->output_section->vma + sdyn->output_offset,
5642 htab->elf.sgotplt->contents);
5643 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5644 bfd_put_64 (output_bfd, (bfd_vma) 0,
5645 htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
5646 bfd_put_64 (output_bfd, (bfd_vma) 0,
5647 htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
5648
5649 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize
5650 = GOT_ENTRY_SIZE;
5651 }
5652
5653 /* Adjust .eh_frame for .plt section. */
5654 if (htab->plt_eh_frame != NULL
5655 && htab->plt_eh_frame->contents != NULL)
5656 {
5657 if (htab->elf.splt != NULL
5658 && htab->elf.splt->size != 0
5659 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5660 && htab->elf.splt->output_section != NULL
5661 && htab->plt_eh_frame->output_section != NULL)
5662 {
5663 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5664 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5665 + htab->plt_eh_frame->output_offset
5666 + PLT_FDE_START_OFFSET;
5667 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5668 htab->plt_eh_frame->contents
5669 + PLT_FDE_START_OFFSET);
5670 }
5671 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5672 {
5673 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5674 htab->plt_eh_frame,
5675 htab->plt_eh_frame->contents))
5676 return FALSE;
5677 }
5678 }
5679
5680 /* Adjust .eh_frame for .plt.got section. */
5681 if (htab->plt_got_eh_frame != NULL
5682 && htab->plt_got_eh_frame->contents != NULL)
5683 {
5684 if (htab->plt_got != NULL
5685 && htab->plt_got->size != 0
5686 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
5687 && htab->plt_got->output_section != NULL
5688 && htab->plt_got_eh_frame->output_section != NULL)
5689 {
5690 bfd_vma plt_start = htab->plt_got->output_section->vma;
5691 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
5692 + htab->plt_got_eh_frame->output_offset
5693 + PLT_FDE_START_OFFSET;
5694 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5695 htab->plt_got_eh_frame->contents
5696 + PLT_FDE_START_OFFSET);
5697 }
5698 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5699 {
5700 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5701 htab->plt_got_eh_frame,
5702 htab->plt_got_eh_frame->contents))
5703 return FALSE;
5704 }
5705 }
5706
5707 /* Adjust .eh_frame for the second PLT section. */
5708 if (htab->plt_second_eh_frame != NULL
5709 && htab->plt_second_eh_frame->contents != NULL)
5710 {
5711 if (htab->plt_second != NULL
5712 && htab->plt_second->size != 0
5713 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
5714 && htab->plt_second->output_section != NULL
5715 && htab->plt_second_eh_frame->output_section != NULL)
5716 {
5717 bfd_vma plt_start = htab->plt_second->output_section->vma;
5718 bfd_vma eh_frame_start
5719 = (htab->plt_second_eh_frame->output_section->vma
5720 + htab->plt_second_eh_frame->output_offset
5721 + PLT_FDE_START_OFFSET);
5722 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5723 htab->plt_second_eh_frame->contents
5724 + PLT_FDE_START_OFFSET);
5725 }
5726 if (htab->plt_second_eh_frame->sec_info_type
5727 == SEC_INFO_TYPE_EH_FRAME)
5728 {
5729 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5730 htab->plt_second_eh_frame,
5731 htab->plt_second_eh_frame->contents))
5732 return FALSE;
5733 }
5734 }
5735
5736 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5737 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5738 = GOT_ENTRY_SIZE;
5739
5740 /* Fill PLT entries for undefined weak symbols in PIE. */
5741 if (bfd_link_pie (info))
5742 bfd_hash_traverse (&info->hash->table,
5743 elf_x86_64_pie_finish_undefweak_symbol,
5744 info);
5745
5746 return TRUE;
5747 }
5748
5749 /* Fill PLT/GOT entries and allocate dynamic relocations for local
5750 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
5751 It has to be done before elf_link_sort_relocs is called so that
5752 dynamic relocations are properly sorted. */
5753
5754 static bfd_boolean
5755 elf_x86_64_output_arch_local_syms
5756 (bfd *output_bfd ATTRIBUTE_UNUSED,
5757 struct bfd_link_info *info,
5758 void *flaginfo ATTRIBUTE_UNUSED,
5759 int (*func) (void *, const char *,
5760 Elf_Internal_Sym *,
5761 asection *,
5762 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
5763 {
5764 struct elf_x86_link_hash_table *htab
5765 = elf_x86_hash_table (info, X86_64_ELF_DATA);
5766 if (htab == NULL)
5767 return FALSE;
5768
5769 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5770 htab_traverse (htab->loc_hash_table,
5771 elf_x86_64_finish_local_dynamic_symbol,
5772 info);
5773
5774 return TRUE;
5775 }
5776
5777 /* Forward declaration. */
5778 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt;
5779
5780 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
5781 dynamic relocations. */
5782
5783 static long
5784 elf_x86_64_get_synthetic_symtab (bfd *abfd,
5785 long symcount ATTRIBUTE_UNUSED,
5786 asymbol **syms ATTRIBUTE_UNUSED,
5787 long dynsymcount,
5788 asymbol **dynsyms,
5789 asymbol **ret)
5790 {
5791 long count, i, n;
5792 int j;
5793 bfd_byte *plt_contents;
5794 long relsize;
5795 const struct elf_x86_lazy_plt_layout *lazy_plt;
5796 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
5797 const struct elf_x86_lazy_plt_layout *lazy_bnd_plt;
5798 const struct elf_x86_non_lazy_plt_layout *non_lazy_bnd_plt;
5799 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
5800 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
5801 asection *plt;
5802 enum elf_x86_plt_type plt_type;
5803 struct elf_x86_plt plts[] =
5804 {
5805 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
5806 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
5807 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
5808 { ".plt.bnd", NULL, NULL, plt_second, 0, 0, 0, 0 },
5809 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
5810 };
5811
5812 *ret = NULL;
5813
5814 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
5815 return 0;
5816
5817 if (dynsymcount <= 0)
5818 return 0;
5819
5820 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
5821 if (relsize <= 0)
5822 return -1;
5823
5824 if (get_elf_x86_64_backend_data (abfd)->os == is_normal)
5825 {
5826 lazy_plt = &elf_x86_64_lazy_plt;
5827 non_lazy_plt = &elf_x86_64_non_lazy_plt;
5828 lazy_bnd_plt = &elf_x86_64_lazy_bnd_plt;
5829 non_lazy_bnd_plt = &elf_x86_64_non_lazy_bnd_plt;
5830 if (ABI_64_P (abfd))
5831 {
5832 lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt;
5833 non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt;
5834 }
5835 else
5836 {
5837 lazy_ibt_plt = &elf_x32_lazy_ibt_plt;
5838 non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt;
5839 }
5840 }
5841 else
5842 {
5843 lazy_plt = &elf_x86_64_nacl_plt;
5844 non_lazy_plt = NULL;
5845 lazy_bnd_plt = NULL;
5846 non_lazy_bnd_plt = NULL;
5847 lazy_ibt_plt = NULL;
5848 non_lazy_ibt_plt = NULL;
5849 }
5850
5851 count = 0;
5852 for (j = 0; plts[j].name != NULL; j++)
5853 {
5854 plt = bfd_get_section_by_name (abfd, plts[j].name);
5855 if (plt == NULL || plt->size == 0)
5856 continue;
5857
5858 /* Get the PLT section contents. */
5859 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5860 if (plt_contents == NULL)
5861 break;
5862 if (!bfd_get_section_contents (abfd, (asection *) plt,
5863 plt_contents, 0, plt->size))
5864 {
5865 free (plt_contents);
5866 break;
5867 }
5868
5869 /* Check what kind of PLT it is. */
5870 plt_type = plt_unknown;
5871 if (plts[j].type == plt_unknown
5872 && (plt->size >= (lazy_plt->plt_entry_size
5873 + lazy_plt->plt_entry_size)))
5874 {
5875 /* Match lazy PLT first. Need to check the first two
5876 instructions. */
5877 if ((memcmp (plt_contents, lazy_plt->plt0_entry,
5878 lazy_plt->plt0_got1_offset) == 0)
5879 && (memcmp (plt_contents + 6, lazy_plt->plt0_entry + 6,
5880 2) == 0))
5881 plt_type = plt_lazy;
5882 else if (lazy_bnd_plt != NULL
5883 && (memcmp (plt_contents, lazy_bnd_plt->plt0_entry,
5884 lazy_bnd_plt->plt0_got1_offset) == 0)
5885 && (memcmp (plt_contents + 6,
5886 lazy_bnd_plt->plt0_entry + 6, 3) == 0))
5887 {
5888 plt_type = plt_lazy | plt_second;
5889 /* The fist entry in the lazy IBT PLT is the same as the
5890 lazy BND PLT. */
5891 if ((memcmp (plt_contents + lazy_ibt_plt->plt_entry_size,
5892 lazy_ibt_plt->plt_entry,
5893 lazy_ibt_plt->plt_got_offset) == 0))
5894 lazy_plt = lazy_ibt_plt;
5895 else
5896 lazy_plt = lazy_bnd_plt;
5897 }
5898 }
5899
5900 if (non_lazy_plt != NULL
5901 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
5902 && plt->size >= non_lazy_plt->plt_entry_size)
5903 {
5904 /* Match non-lazy PLT. */
5905 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
5906 non_lazy_plt->plt_got_offset) == 0)
5907 plt_type = plt_non_lazy;
5908 }
5909
5910 if (plt_type == plt_unknown || plt_type == plt_second)
5911 {
5912 if (non_lazy_bnd_plt != NULL
5913 && plt->size >= non_lazy_bnd_plt->plt_entry_size
5914 && (memcmp (plt_contents, non_lazy_bnd_plt->plt_entry,
5915 non_lazy_bnd_plt->plt_got_offset) == 0))
5916 {
5917 /* Match BND PLT. */
5918 plt_type = plt_second;
5919 non_lazy_plt = non_lazy_bnd_plt;
5920 }
5921 else if (non_lazy_ibt_plt != NULL
5922 && plt->size >= non_lazy_ibt_plt->plt_entry_size
5923 && (memcmp (plt_contents,
5924 non_lazy_ibt_plt->plt_entry,
5925 non_lazy_ibt_plt->plt_got_offset) == 0))
5926 {
5927 /* Match IBT PLT. */
5928 plt_type = plt_second;
5929 non_lazy_plt = non_lazy_ibt_plt;
5930 }
5931 }
5932
5933 if (plt_type == plt_unknown)
5934 {
5935 free (plt_contents);
5936 continue;
5937 }
5938
5939 plts[j].sec = plt;
5940 plts[j].type = plt_type;
5941
5942 if ((plt_type & plt_lazy))
5943 {
5944 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
5945 plts[j].plt_got_insn_size = lazy_plt->plt_got_insn_size;
5946 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
5947 /* Skip PLT0 in lazy PLT. */
5948 i = 1;
5949 }
5950 else
5951 {
5952 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
5953 plts[j].plt_got_insn_size = non_lazy_plt->plt_got_insn_size;
5954 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
5955 i = 0;
5956 }
5957
5958 /* Skip lazy PLT when the second PLT is used. */
5959 if (plt_type == (plt_lazy | plt_second))
5960 plts[j].count = 0;
5961 else
5962 {
5963 n = plt->size / plts[j].plt_entry_size;
5964 plts[j].count = n;
5965 count += n - i;
5966 }
5967
5968 plts[j].contents = plt_contents;
5969 }
5970
5971 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
5972 (bfd_vma) 0, plts, dynsyms,
5973 ret);
5974 }
5975
5976 /* Handle an x86-64 specific section when reading an object file. This
5977 is called when elfcode.h finds a section with an unknown type. */
5978
5979 static bfd_boolean
5980 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
5981 const char *name, int shindex)
5982 {
5983 if (hdr->sh_type != SHT_X86_64_UNWIND)
5984 return FALSE;
5985
5986 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
5987 return FALSE;
5988
5989 return TRUE;
5990 }
5991
5992 /* Hook called by the linker routine which adds symbols from an object
5993 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5994 of .bss. */
5995
5996 static bfd_boolean
5997 elf_x86_64_add_symbol_hook (bfd *abfd,
5998 struct bfd_link_info *info ATTRIBUTE_UNUSED,
5999 Elf_Internal_Sym *sym,
6000 const char **namep ATTRIBUTE_UNUSED,
6001 flagword *flagsp ATTRIBUTE_UNUSED,
6002 asection **secp,
6003 bfd_vma *valp)
6004 {
6005 asection *lcomm;
6006
6007 switch (sym->st_shndx)
6008 {
6009 case SHN_X86_64_LCOMMON:
6010 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
6011 if (lcomm == NULL)
6012 {
6013 lcomm = bfd_make_section_with_flags (abfd,
6014 "LARGE_COMMON",
6015 (SEC_ALLOC
6016 | SEC_IS_COMMON
6017 | SEC_LINKER_CREATED));
6018 if (lcomm == NULL)
6019 return FALSE;
6020 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
6021 }
6022 *secp = lcomm;
6023 *valp = sym->st_size;
6024 return TRUE;
6025 }
6026
6027 return TRUE;
6028 }
6029
6030
6031 /* Given a BFD section, try to locate the corresponding ELF section
6032 index. */
6033
6034 static bfd_boolean
6035 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
6036 asection *sec, int *index_return)
6037 {
6038 if (sec == &_bfd_elf_large_com_section)
6039 {
6040 *index_return = SHN_X86_64_LCOMMON;
6041 return TRUE;
6042 }
6043 return FALSE;
6044 }
6045
6046 /* Process a symbol. */
6047
6048 static void
6049 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
6050 asymbol *asym)
6051 {
6052 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
6053
6054 switch (elfsym->internal_elf_sym.st_shndx)
6055 {
6056 case SHN_X86_64_LCOMMON:
6057 asym->section = &_bfd_elf_large_com_section;
6058 asym->value = elfsym->internal_elf_sym.st_size;
6059 /* Common symbol doesn't set BSF_GLOBAL. */
6060 asym->flags &= ~BSF_GLOBAL;
6061 break;
6062 }
6063 }
6064
6065 static bfd_boolean
6066 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
6067 {
6068 return (sym->st_shndx == SHN_COMMON
6069 || sym->st_shndx == SHN_X86_64_LCOMMON);
6070 }
6071
6072 static unsigned int
6073 elf_x86_64_common_section_index (asection *sec)
6074 {
6075 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6076 return SHN_COMMON;
6077 else
6078 return SHN_X86_64_LCOMMON;
6079 }
6080
6081 static asection *
6082 elf_x86_64_common_section (asection *sec)
6083 {
6084 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6085 return bfd_com_section_ptr;
6086 else
6087 return &_bfd_elf_large_com_section;
6088 }
6089
6090 static bfd_boolean
6091 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
6092 const Elf_Internal_Sym *sym,
6093 asection **psec,
6094 bfd_boolean newdef,
6095 bfd_boolean olddef,
6096 bfd *oldbfd,
6097 const asection *oldsec)
6098 {
6099 /* A normal common symbol and a large common symbol result in a
6100 normal common symbol. We turn the large common symbol into a
6101 normal one. */
6102 if (!olddef
6103 && h->root.type == bfd_link_hash_common
6104 && !newdef
6105 && bfd_is_com_section (*psec)
6106 && oldsec != *psec)
6107 {
6108 if (sym->st_shndx == SHN_COMMON
6109 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
6110 {
6111 h->root.u.c.p->section
6112 = bfd_make_section_old_way (oldbfd, "COMMON");
6113 h->root.u.c.p->section->flags = SEC_ALLOC;
6114 }
6115 else if (sym->st_shndx == SHN_X86_64_LCOMMON
6116 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
6117 *psec = bfd_com_section_ptr;
6118 }
6119
6120 return TRUE;
6121 }
6122
6123 static int
6124 elf_x86_64_additional_program_headers (bfd *abfd,
6125 struct bfd_link_info *info ATTRIBUTE_UNUSED)
6126 {
6127 asection *s;
6128 int count = 0;
6129
6130 /* Check to see if we need a large readonly segment. */
6131 s = bfd_get_section_by_name (abfd, ".lrodata");
6132 if (s && (s->flags & SEC_LOAD))
6133 count++;
6134
6135 /* Check to see if we need a large data segment. Since .lbss sections
6136 is placed right after the .bss section, there should be no need for
6137 a large data segment just because of .lbss. */
6138 s = bfd_get_section_by_name (abfd, ".ldata");
6139 if (s && (s->flags & SEC_LOAD))
6140 count++;
6141
6142 return count;
6143 }
6144
6145 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6146
6147 static bfd_boolean
6148 elf_x86_64_relocs_compatible (const bfd_target *input,
6149 const bfd_target *output)
6150 {
6151 return ((xvec_get_elf_backend_data (input)->s->elfclass
6152 == xvec_get_elf_backend_data (output)->s->elfclass)
6153 && _bfd_elf_relocs_compatible (input, output));
6154 }
6155
6156 /* Set up x86-64 GNU properties. Return the first relocatable ELF input
6157 with GNU properties if found. Otherwise, return NULL. */
6158
6159 static bfd *
6160 elf_x86_64_link_setup_gnu_properties (struct bfd_link_info *info)
6161 {
6162 struct elf_x86_plt_layout_table plt_layout;
6163
6164 plt_layout.is_vxworks = FALSE;
6165 if (get_elf_x86_64_backend_data (info->output_bfd)->os == is_normal)
6166 {
6167 if (info->bndplt)
6168 {
6169 plt_layout.lazy_plt = &elf_x86_64_lazy_bnd_plt;
6170 plt_layout.non_lazy_plt = &elf_x86_64_non_lazy_bnd_plt;
6171 }
6172 else
6173 {
6174 plt_layout.lazy_plt = &elf_x86_64_lazy_plt;
6175 plt_layout.non_lazy_plt = &elf_x86_64_non_lazy_plt;
6176 }
6177
6178 if (ABI_64_P (info->output_bfd))
6179 {
6180 plt_layout.lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt;
6181 plt_layout.non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt;
6182 }
6183 else
6184 {
6185 plt_layout.lazy_ibt_plt = &elf_x32_lazy_ibt_plt;
6186 plt_layout.non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt;
6187 }
6188 plt_layout.normal_target = TRUE;
6189 }
6190 else
6191 {
6192 plt_layout.lazy_plt = &elf_x86_64_nacl_plt;
6193 plt_layout.non_lazy_plt = NULL;
6194 plt_layout.lazy_ibt_plt = NULL;
6195 plt_layout.non_lazy_ibt_plt = NULL;
6196 plt_layout.normal_target = FALSE;
6197 }
6198
6199 return _bfd_x86_elf_link_setup_gnu_properties (info, &plt_layout);
6200 }
6201
6202 static const struct bfd_elf_special_section
6203 elf_x86_64_special_sections[]=
6204 {
6205 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6206 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6207 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
6208 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6209 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6210 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6211 { NULL, 0, 0, 0, 0 }
6212 };
6213
6214 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6215 #define TARGET_LITTLE_NAME "elf64-x86-64"
6216 #define ELF_ARCH bfd_arch_i386
6217 #define ELF_TARGET_ID X86_64_ELF_DATA
6218 #define ELF_MACHINE_CODE EM_X86_64
6219 #define ELF_MAXPAGESIZE 0x200000
6220 #define ELF_MINPAGESIZE 0x1000
6221 #define ELF_COMMONPAGESIZE 0x1000
6222
6223 #define elf_backend_can_gc_sections 1
6224 #define elf_backend_can_refcount 1
6225 #define elf_backend_want_got_plt 1
6226 #define elf_backend_plt_readonly 1
6227 #define elf_backend_want_plt_sym 0
6228 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6229 #define elf_backend_rela_normal 1
6230 #define elf_backend_plt_alignment 4
6231 #define elf_backend_extern_protected_data 1
6232 #define elf_backend_caches_rawsize 1
6233 #define elf_backend_dtrel_excludes_plt 1
6234 #define elf_backend_want_dynrelro 1
6235
6236 #define elf_info_to_howto elf_x86_64_info_to_howto
6237
6238 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6239 #define bfd_elf64_bfd_reloc_name_lookup \
6240 elf_x86_64_reloc_name_lookup
6241
6242 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6243 #define elf_backend_check_relocs elf_x86_64_check_relocs
6244 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
6245 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6246 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6247 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
6248 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6249 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6250 #ifdef CORE_HEADER
6251 #define elf_backend_write_core_note elf_x86_64_write_core_note
6252 #endif
6253 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6254 #define elf_backend_relocate_section elf_x86_64_relocate_section
6255 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6256 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6257 #define elf_backend_object_p elf64_x86_64_elf_object_p
6258 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6259
6260 #define elf_backend_section_from_shdr \
6261 elf_x86_64_section_from_shdr
6262
6263 #define elf_backend_section_from_bfd_section \
6264 elf_x86_64_elf_section_from_bfd_section
6265 #define elf_backend_add_symbol_hook \
6266 elf_x86_64_add_symbol_hook
6267 #define elf_backend_symbol_processing \
6268 elf_x86_64_symbol_processing
6269 #define elf_backend_common_section_index \
6270 elf_x86_64_common_section_index
6271 #define elf_backend_common_section \
6272 elf_x86_64_common_section
6273 #define elf_backend_common_definition \
6274 elf_x86_64_common_definition
6275 #define elf_backend_merge_symbol \
6276 elf_x86_64_merge_symbol
6277 #define elf_backend_special_sections \
6278 elf_x86_64_special_sections
6279 #define elf_backend_additional_program_headers \
6280 elf_x86_64_additional_program_headers
6281 #define elf_backend_setup_gnu_properties \
6282 elf_x86_64_link_setup_gnu_properties
6283
6284 #include "elf64-target.h"
6285
6286 /* CloudABI support. */
6287
6288 #undef TARGET_LITTLE_SYM
6289 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6290 #undef TARGET_LITTLE_NAME
6291 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6292
6293 #undef ELF_OSABI
6294 #define ELF_OSABI ELFOSABI_CLOUDABI
6295
6296 #undef elf64_bed
6297 #define elf64_bed elf64_x86_64_cloudabi_bed
6298
6299 #include "elf64-target.h"
6300
6301 /* FreeBSD support. */
6302
6303 #undef TARGET_LITTLE_SYM
6304 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6305 #undef TARGET_LITTLE_NAME
6306 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6307
6308 #undef ELF_OSABI
6309 #define ELF_OSABI ELFOSABI_FREEBSD
6310
6311 #undef elf64_bed
6312 #define elf64_bed elf64_x86_64_fbsd_bed
6313
6314 #include "elf64-target.h"
6315
6316 /* Solaris 2 support. */
6317
6318 #undef TARGET_LITTLE_SYM
6319 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6320 #undef TARGET_LITTLE_NAME
6321 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6322
6323 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6324 objects won't be recognized. */
6325 #undef ELF_OSABI
6326
6327 #undef elf64_bed
6328 #define elf64_bed elf64_x86_64_sol2_bed
6329
6330 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6331 boundary. */
6332 #undef elf_backend_static_tls_alignment
6333 #define elf_backend_static_tls_alignment 16
6334
6335 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6336
6337 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6338 File, p.63. */
6339 #undef elf_backend_want_plt_sym
6340 #define elf_backend_want_plt_sym 1
6341
6342 #undef elf_backend_strtab_flags
6343 #define elf_backend_strtab_flags SHF_STRINGS
6344
6345 static bfd_boolean
6346 elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
6347 bfd *obfd ATTRIBUTE_UNUSED,
6348 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
6349 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
6350 {
6351 /* PR 19938: FIXME: Need to add code for setting the sh_info
6352 and sh_link fields of Solaris specific section types. */
6353 return FALSE;
6354 }
6355
6356 #undef elf_backend_copy_special_section_fields
6357 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
6358
6359 #include "elf64-target.h"
6360
6361 /* Native Client support. */
6362
6363 static bfd_boolean
6364 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
6365 {
6366 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6367 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
6368 return TRUE;
6369 }
6370
6371 #undef TARGET_LITTLE_SYM
6372 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6373 #undef TARGET_LITTLE_NAME
6374 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6375 #undef elf64_bed
6376 #define elf64_bed elf64_x86_64_nacl_bed
6377
6378 #undef ELF_MAXPAGESIZE
6379 #undef ELF_MINPAGESIZE
6380 #undef ELF_COMMONPAGESIZE
6381 #define ELF_MAXPAGESIZE 0x10000
6382 #define ELF_MINPAGESIZE 0x10000
6383 #define ELF_COMMONPAGESIZE 0x10000
6384
6385 /* Restore defaults. */
6386 #undef ELF_OSABI
6387 #undef elf_backend_static_tls_alignment
6388 #undef elf_backend_want_plt_sym
6389 #define elf_backend_want_plt_sym 0
6390 #undef elf_backend_strtab_flags
6391 #undef elf_backend_copy_special_section_fields
6392
6393 /* NaCl uses substantially different PLT entries for the same effects. */
6394
6395 #undef elf_backend_plt_alignment
6396 #define elf_backend_plt_alignment 5
6397 #define NACL_PLT_ENTRY_SIZE 64
6398 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6399
6400 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
6401 {
6402 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6403 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6404 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6405 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6406 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6407
6408 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6409 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6410
6411 /* 32 bytes of nop to pad out to the standard size. */
6412 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
6413 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6414 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
6415 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6416 0x66, /* excess data16 prefix */
6417 0x90 /* nop */
6418 };
6419
6420 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6421 {
6422 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6423 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6424 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6425 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6426
6427 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6428 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
6429 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6430
6431 /* Lazy GOT entries point here (32-byte aligned). */
6432 0x68, /* pushq immediate */
6433 0, 0, 0, 0, /* replaced with index into relocation table. */
6434 0xe9, /* jmp relative */
6435 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
6436
6437 /* 22 bytes of nop to pad out to the standard size. */
6438 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
6439 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6440 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
6441 };
6442
6443 /* .eh_frame covering the .plt section. */
6444
6445 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
6446 {
6447 #if (PLT_CIE_LENGTH != 20 \
6448 || PLT_FDE_LENGTH != 36 \
6449 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6450 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6451 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
6452 #endif
6453 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6454 0, 0, 0, 0, /* CIE ID */
6455 1, /* CIE version */
6456 'z', 'R', 0, /* Augmentation string */
6457 1, /* Code alignment factor */
6458 0x78, /* Data alignment factor */
6459 16, /* Return address column */
6460 1, /* Augmentation size */
6461 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6462 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
6463 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
6464 DW_CFA_nop, DW_CFA_nop,
6465
6466 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6467 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
6468 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
6469 0, 0, 0, 0, /* .plt size goes here */
6470 0, /* Augmentation size */
6471 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
6472 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6473 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
6474 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6475 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6476 13, /* Block length */
6477 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
6478 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
6479 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6480 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
6481 DW_CFA_nop, DW_CFA_nop
6482 };
6483
6484 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt =
6485 {
6486 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
6487 NACL_PLT_ENTRY_SIZE, /* plt0_entry_size */
6488 elf_x86_64_nacl_plt_entry, /* plt_entry */
6489 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6490 2, /* plt0_got1_offset */
6491 9, /* plt0_got2_offset */
6492 13, /* plt0_got2_insn_end */
6493 3, /* plt_got_offset */
6494 33, /* plt_reloc_offset */
6495 38, /* plt_plt_offset */
6496 7, /* plt_got_insn_size */
6497 42, /* plt_plt_insn_end */
6498 32, /* plt_lazy_offset */
6499 elf_x86_64_nacl_plt0_entry, /* pic_plt0_entry */
6500 elf_x86_64_nacl_plt_entry, /* pic_plt_entry */
6501 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
6502 sizeof (elf_x86_64_nacl_eh_frame_plt) /* eh_frame_plt_size */
6503 };
6504
6505 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
6506 {
6507 is_nacl /* os */
6508 };
6509
6510 #undef elf_backend_arch_data
6511 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
6512
6513 #undef elf_backend_object_p
6514 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
6515 #undef elf_backend_modify_segment_map
6516 #define elf_backend_modify_segment_map nacl_modify_segment_map
6517 #undef elf_backend_modify_program_headers
6518 #define elf_backend_modify_program_headers nacl_modify_program_headers
6519 #undef elf_backend_final_write_processing
6520 #define elf_backend_final_write_processing nacl_final_write_processing
6521
6522 #include "elf64-target.h"
6523
6524 /* Native Client x32 support. */
6525
6526 static bfd_boolean
6527 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
6528 {
6529 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
6530 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
6531 return TRUE;
6532 }
6533
6534 #undef TARGET_LITTLE_SYM
6535 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
6536 #undef TARGET_LITTLE_NAME
6537 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
6538 #undef elf32_bed
6539 #define elf32_bed elf32_x86_64_nacl_bed
6540
6541 #define bfd_elf32_bfd_reloc_type_lookup \
6542 elf_x86_64_reloc_type_lookup
6543 #define bfd_elf32_bfd_reloc_name_lookup \
6544 elf_x86_64_reloc_name_lookup
6545 #define bfd_elf32_get_synthetic_symtab \
6546 elf_x86_64_get_synthetic_symtab
6547
6548 #undef elf_backend_object_p
6549 #define elf_backend_object_p \
6550 elf32_x86_64_nacl_elf_object_p
6551
6552 #undef elf_backend_bfd_from_remote_memory
6553 #define elf_backend_bfd_from_remote_memory \
6554 _bfd_elf32_bfd_from_remote_memory
6555
6556 #undef elf_backend_size_info
6557 #define elf_backend_size_info \
6558 _bfd_elf32_size_info
6559
6560 #include "elf32-target.h"
6561
6562 /* Restore defaults. */
6563 #undef elf_backend_object_p
6564 #define elf_backend_object_p elf64_x86_64_elf_object_p
6565 #undef elf_backend_bfd_from_remote_memory
6566 #undef elf_backend_size_info
6567 #undef elf_backend_modify_segment_map
6568 #undef elf_backend_modify_program_headers
6569 #undef elf_backend_final_write_processing
6570
6571 /* Intel L1OM support. */
6572
6573 static bfd_boolean
6574 elf64_l1om_elf_object_p (bfd *abfd)
6575 {
6576 /* Set the right machine number for an L1OM elf64 file. */
6577 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
6578 return TRUE;
6579 }
6580
6581 #undef TARGET_LITTLE_SYM
6582 #define TARGET_LITTLE_SYM l1om_elf64_vec
6583 #undef TARGET_LITTLE_NAME
6584 #define TARGET_LITTLE_NAME "elf64-l1om"
6585 #undef ELF_ARCH
6586 #define ELF_ARCH bfd_arch_l1om
6587
6588 #undef ELF_MACHINE_CODE
6589 #define ELF_MACHINE_CODE EM_L1OM
6590
6591 #undef ELF_OSABI
6592
6593 #undef elf64_bed
6594 #define elf64_bed elf64_l1om_bed
6595
6596 #undef elf_backend_object_p
6597 #define elf_backend_object_p elf64_l1om_elf_object_p
6598
6599 /* Restore defaults. */
6600 #undef ELF_MAXPAGESIZE
6601 #undef ELF_MINPAGESIZE
6602 #undef ELF_COMMONPAGESIZE
6603 #define ELF_MAXPAGESIZE 0x200000
6604 #define ELF_MINPAGESIZE 0x1000
6605 #define ELF_COMMONPAGESIZE 0x1000
6606 #undef elf_backend_plt_alignment
6607 #define elf_backend_plt_alignment 4
6608 #undef elf_backend_arch_data
6609 #define elf_backend_arch_data &elf_x86_64_arch_bed
6610
6611 #include "elf64-target.h"
6612
6613 /* FreeBSD L1OM support. */
6614
6615 #undef TARGET_LITTLE_SYM
6616 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
6617 #undef TARGET_LITTLE_NAME
6618 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
6619
6620 #undef ELF_OSABI
6621 #define ELF_OSABI ELFOSABI_FREEBSD
6622
6623 #undef elf64_bed
6624 #define elf64_bed elf64_l1om_fbsd_bed
6625
6626 #include "elf64-target.h"
6627
6628 /* Intel K1OM support. */
6629
6630 static bfd_boolean
6631 elf64_k1om_elf_object_p (bfd *abfd)
6632 {
6633 /* Set the right machine number for an K1OM elf64 file. */
6634 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
6635 return TRUE;
6636 }
6637
6638 #undef TARGET_LITTLE_SYM
6639 #define TARGET_LITTLE_SYM k1om_elf64_vec
6640 #undef TARGET_LITTLE_NAME
6641 #define TARGET_LITTLE_NAME "elf64-k1om"
6642 #undef ELF_ARCH
6643 #define ELF_ARCH bfd_arch_k1om
6644
6645 #undef ELF_MACHINE_CODE
6646 #define ELF_MACHINE_CODE EM_K1OM
6647
6648 #undef ELF_OSABI
6649
6650 #undef elf64_bed
6651 #define elf64_bed elf64_k1om_bed
6652
6653 #undef elf_backend_object_p
6654 #define elf_backend_object_p elf64_k1om_elf_object_p
6655
6656 #undef elf_backend_static_tls_alignment
6657
6658 #undef elf_backend_want_plt_sym
6659 #define elf_backend_want_plt_sym 0
6660
6661 #include "elf64-target.h"
6662
6663 /* FreeBSD K1OM support. */
6664
6665 #undef TARGET_LITTLE_SYM
6666 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
6667 #undef TARGET_LITTLE_NAME
6668 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
6669
6670 #undef ELF_OSABI
6671 #define ELF_OSABI ELFOSABI_FREEBSD
6672
6673 #undef elf64_bed
6674 #define elf64_bed elf64_k1om_fbsd_bed
6675
6676 #include "elf64-target.h"
6677
6678 /* 32bit x86-64 support. */
6679
6680 #undef TARGET_LITTLE_SYM
6681 #define TARGET_LITTLE_SYM x86_64_elf32_vec
6682 #undef TARGET_LITTLE_NAME
6683 #define TARGET_LITTLE_NAME "elf32-x86-64"
6684 #undef elf32_bed
6685
6686 #undef ELF_ARCH
6687 #define ELF_ARCH bfd_arch_i386
6688
6689 #undef ELF_MACHINE_CODE
6690 #define ELF_MACHINE_CODE EM_X86_64
6691
6692 #undef ELF_OSABI
6693
6694 #undef elf_backend_object_p
6695 #define elf_backend_object_p \
6696 elf32_x86_64_elf_object_p
6697
6698 #undef elf_backend_bfd_from_remote_memory
6699 #define elf_backend_bfd_from_remote_memory \
6700 _bfd_elf32_bfd_from_remote_memory
6701
6702 #undef elf_backend_size_info
6703 #define elf_backend_size_info \
6704 _bfd_elf32_size_info
6705
6706 #include "elf32-target.h"
GDB Binutils - Deliverables
This page took 0.349662 seconds and 4 git commands to generate.