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[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 /* Set if a relocation is converted from a GOTPCREL relocation. */
200 #define R_X86_64_converted_reloc_bit (1 << 7)
201
202 #define X86_PCREL_TYPE_P(TYPE) \
203 ( ((TYPE) == R_X86_64_PC8) \
204 || ((TYPE) == R_X86_64_PC16) \
205 || ((TYPE) == R_X86_64_PC32) \
206 || ((TYPE) == R_X86_64_PC32_BND) \
207 || ((TYPE) == R_X86_64_PC64))
208
209 /* Map BFD relocs to the x86_64 elf relocs. */
210 struct elf_reloc_map
211 {
212 bfd_reloc_code_real_type bfd_reloc_val;
213 unsigned char elf_reloc_val;
214 };
215
216 static const struct elf_reloc_map x86_64_reloc_map[] =
217 {
218 { BFD_RELOC_NONE, R_X86_64_NONE, },
219 { BFD_RELOC_64, R_X86_64_64, },
220 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
221 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
222 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
223 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
224 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
225 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
226 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
227 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
228 { BFD_RELOC_32, R_X86_64_32, },
229 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
230 { BFD_RELOC_16, R_X86_64_16, },
231 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
232 { BFD_RELOC_8, R_X86_64_8, },
233 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
234 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
235 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
236 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
237 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
238 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
239 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
240 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
241 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
242 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
243 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
244 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
245 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
246 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
247 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
248 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
249 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
250 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
251 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
252 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
253 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
254 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
255 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
256 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, },
257 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, },
258 { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, },
259 { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, },
260 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
261 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
262 };
263
264 static reloc_howto_type *
265 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
266 {
267 unsigned i;
268
269 if (r_type == (unsigned int) R_X86_64_32)
270 {
271 if (ABI_64_P (abfd))
272 i = r_type;
273 else
274 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
275 }
276 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
277 || r_type >= (unsigned int) R_X86_64_max)
278 {
279 if (r_type >= (unsigned int) R_X86_64_standard)
280 {
281 /* xgettext:c-format */
282 _bfd_error_handler (_("%B: invalid relocation type %d"),
283 abfd, (int) r_type);
284 r_type = R_X86_64_NONE;
285 }
286 i = r_type;
287 }
288 else
289 i = r_type - (unsigned int) R_X86_64_vt_offset;
290 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
291 return &x86_64_elf_howto_table[i];
292 }
293
294 /* Given a BFD reloc type, return a HOWTO structure. */
295 static reloc_howto_type *
296 elf_x86_64_reloc_type_lookup (bfd *abfd,
297 bfd_reloc_code_real_type code)
298 {
299 unsigned int i;
300
301 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
302 i++)
303 {
304 if (x86_64_reloc_map[i].bfd_reloc_val == code)
305 return elf_x86_64_rtype_to_howto (abfd,
306 x86_64_reloc_map[i].elf_reloc_val);
307 }
308 return NULL;
309 }
310
311 static reloc_howto_type *
312 elf_x86_64_reloc_name_lookup (bfd *abfd,
313 const char *r_name)
314 {
315 unsigned int i;
316
317 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
318 {
319 /* Get x32 R_X86_64_32. */
320 reloc_howto_type *reloc
321 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
322 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
323 return reloc;
324 }
325
326 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
327 if (x86_64_elf_howto_table[i].name != NULL
328 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
329 return &x86_64_elf_howto_table[i];
330
331 return NULL;
332 }
333
334 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
335
336 static void
337 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
338 Elf_Internal_Rela *dst)
339 {
340 unsigned r_type;
341
342 r_type = ELF32_R_TYPE (dst->r_info);
343 if (r_type != (unsigned int) R_X86_64_GNU_VTINHERIT
344 && r_type != (unsigned int) R_X86_64_GNU_VTENTRY)
345 r_type &= ~R_X86_64_converted_reloc_bit;
346 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
347
348 BFD_ASSERT (r_type == cache_ptr->howto->type || cache_ptr->howto->type == R_X86_64_NONE);
349 }
350 \f
351 /* Support for core dump NOTE sections. */
352 static bfd_boolean
353 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
354 {
355 int offset;
356 size_t size;
357
358 switch (note->descsz)
359 {
360 default:
361 return FALSE;
362
363 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
364 /* pr_cursig */
365 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
366
367 /* pr_pid */
368 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
369
370 /* pr_reg */
371 offset = 72;
372 size = 216;
373
374 break;
375
376 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
377 /* pr_cursig */
378 elf_tdata (abfd)->core->signal
379 = bfd_get_16 (abfd, note->descdata + 12);
380
381 /* pr_pid */
382 elf_tdata (abfd)->core->lwpid
383 = bfd_get_32 (abfd, note->descdata + 32);
384
385 /* pr_reg */
386 offset = 112;
387 size = 216;
388
389 break;
390 }
391
392 /* Make a ".reg/999" section. */
393 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
394 size, note->descpos + offset);
395 }
396
397 static bfd_boolean
398 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
399 {
400 switch (note->descsz)
401 {
402 default:
403 return FALSE;
404
405 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
406 elf_tdata (abfd)->core->pid
407 = bfd_get_32 (abfd, note->descdata + 12);
408 elf_tdata (abfd)->core->program
409 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
410 elf_tdata (abfd)->core->command
411 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
412 break;
413
414 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
415 elf_tdata (abfd)->core->pid
416 = bfd_get_32 (abfd, note->descdata + 24);
417 elf_tdata (abfd)->core->program
418 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
419 elf_tdata (abfd)->core->command
420 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
421 }
422
423 /* Note that for some reason, a spurious space is tacked
424 onto the end of the args in some (at least one anyway)
425 implementations, so strip it off if it exists. */
426
427 {
428 char *command = elf_tdata (abfd)->core->command;
429 int n = strlen (command);
430
431 if (0 < n && command[n - 1] == ' ')
432 command[n - 1] = '\0';
433 }
434
435 return TRUE;
436 }
437
438 #ifdef CORE_HEADER
439 static char *
440 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
441 int note_type, ...)
442 {
443 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
444 va_list ap;
445 const char *fname, *psargs;
446 long pid;
447 int cursig;
448 const void *gregs;
449
450 switch (note_type)
451 {
452 default:
453 return NULL;
454
455 case NT_PRPSINFO:
456 va_start (ap, note_type);
457 fname = va_arg (ap, const char *);
458 psargs = va_arg (ap, const char *);
459 va_end (ap);
460
461 if (bed->s->elfclass == ELFCLASS32)
462 {
463 prpsinfo32_t data;
464 memset (&data, 0, sizeof (data));
465 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
466 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
467 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
468 &data, sizeof (data));
469 }
470 else
471 {
472 prpsinfo64_t data;
473 memset (&data, 0, sizeof (data));
474 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
475 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
476 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
477 &data, sizeof (data));
478 }
479 /* NOTREACHED */
480
481 case NT_PRSTATUS:
482 va_start (ap, note_type);
483 pid = va_arg (ap, long);
484 cursig = va_arg (ap, int);
485 gregs = va_arg (ap, const void *);
486 va_end (ap);
487
488 if (bed->s->elfclass == ELFCLASS32)
489 {
490 if (bed->elf_machine_code == EM_X86_64)
491 {
492 prstatusx32_t prstat;
493 memset (&prstat, 0, sizeof (prstat));
494 prstat.pr_pid = pid;
495 prstat.pr_cursig = cursig;
496 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
497 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
498 &prstat, sizeof (prstat));
499 }
500 else
501 {
502 prstatus32_t prstat;
503 memset (&prstat, 0, sizeof (prstat));
504 prstat.pr_pid = pid;
505 prstat.pr_cursig = cursig;
506 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
507 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
508 &prstat, sizeof (prstat));
509 }
510 }
511 else
512 {
513 prstatus64_t prstat;
514 memset (&prstat, 0, sizeof (prstat));
515 prstat.pr_pid = pid;
516 prstat.pr_cursig = cursig;
517 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
518 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
519 &prstat, sizeof (prstat));
520 }
521 }
522 /* NOTREACHED */
523 }
524 #endif
525 \f
526 /* Functions for the x86-64 ELF linker. */
527
528 /* The size in bytes of an entry in the global offset table. */
529
530 #define GOT_ENTRY_SIZE 8
531
532 /* The size in bytes of an entry in the lazy procedure linkage table. */
533
534 #define LAZY_PLT_ENTRY_SIZE 16
535
536 /* The size in bytes of an entry in the non-lazy procedure linkage
537 table. */
538
539 #define NON_LAZY_PLT_ENTRY_SIZE 8
540
541 /* The first entry in a lazy procedure linkage table looks like this.
542 See the SVR4 ABI i386 supplement and the x86-64 ABI to see how this
543 works. */
544
545 static const bfd_byte elf_x86_64_lazy_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
546 {
547 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
548 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
549 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
550 };
551
552 /* Subsequent entries in a lazy procedure linkage table look like this. */
553
554 static const bfd_byte elf_x86_64_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
555 {
556 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
557 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
558 0x68, /* pushq immediate */
559 0, 0, 0, 0, /* replaced with index into relocation table. */
560 0xe9, /* jmp relative */
561 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
562 };
563
564 /* The first entry in a lazy procedure linkage table with BND prefix
565 like this. */
566
567 static const bfd_byte elf_x86_64_lazy_bnd_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
568 {
569 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
570 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
571 0x0f, 0x1f, 0 /* nopl (%rax) */
572 };
573
574 /* Subsequent entries for branches with BND prefx in a lazy procedure
575 linkage table look like this. */
576
577 static const bfd_byte elf_x86_64_lazy_bnd_plt_entry[LAZY_PLT_ENTRY_SIZE] =
578 {
579 0x68, 0, 0, 0, 0, /* pushq immediate */
580 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
581 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
582 };
583
584 /* The first entry in the IBT-enabled lazy procedure linkage table is the
585 the same as the lazy PLT with BND prefix so that bound registers are
586 preserved when control is passed to dynamic linker. Subsequent
587 entries for a IBT-enabled lazy procedure linkage table look like
588 this. */
589
590 static const bfd_byte elf_x86_64_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
591 {
592 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
593 0x68, 0, 0, 0, 0, /* pushq immediate */
594 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
595 0x90 /* nop */
596 };
597
598 /* The first entry in the x32 IBT-enabled lazy procedure linkage table
599 is the same as the normal lazy PLT. Subsequent entries for an
600 x32 IBT-enabled lazy procedure linkage table look like this. */
601
602 static const bfd_byte elf_x32_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
603 {
604 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
605 0x68, 0, 0, 0, 0, /* pushq immediate */
606 0xe9, 0, 0, 0, 0, /* jmpq relative */
607 0x66, 0x90 /* xchg %ax,%ax */
608 };
609
610 /* Entries in the non-lazey procedure linkage table look like this. */
611
612 static const bfd_byte elf_x86_64_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
613 {
614 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
615 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
616 0x66, 0x90 /* xchg %ax,%ax */
617 };
618
619 /* Entries for branches with BND prefix in the non-lazey procedure
620 linkage table look like this. */
621
622 static const bfd_byte elf_x86_64_non_lazy_bnd_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
623 {
624 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
625 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
626 0x90 /* nop */
627 };
628
629 /* Entries for branches with IBT-enabled in the non-lazey procedure
630 linkage table look like this. They have the same size as the lazy
631 PLT entry. */
632
633 static const bfd_byte elf_x86_64_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
634 {
635 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
636 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
637 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
638 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopl 0x0(%rax,%rax,1) */
639 };
640
641 /* Entries for branches with IBT-enabled in the x32 non-lazey procedure
642 linkage table look like this. They have the same size as the lazy
643 PLT entry. */
644
645 static const bfd_byte elf_x32_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
646 {
647 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
648 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
649 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
650 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
651 };
652
653 /* .eh_frame covering the lazy .plt section. */
654
655 static const bfd_byte elf_x86_64_eh_frame_lazy_plt[] =
656 {
657 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
658 0, 0, 0, 0, /* CIE ID */
659 1, /* CIE version */
660 'z', 'R', 0, /* Augmentation string */
661 1, /* Code alignment factor */
662 0x78, /* Data alignment factor */
663 16, /* Return address column */
664 1, /* Augmentation size */
665 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
666 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
667 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
668 DW_CFA_nop, DW_CFA_nop,
669
670 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
671 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
672 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
673 0, 0, 0, 0, /* .plt size goes here */
674 0, /* Augmentation size */
675 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
676 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
677 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
678 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
679 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
680 11, /* Block length */
681 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
682 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
683 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
684 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
685 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
686 };
687
688 /* .eh_frame covering the lazy BND .plt section. */
689
690 static const bfd_byte elf_x86_64_eh_frame_lazy_bnd_plt[] =
691 {
692 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
693 0, 0, 0, 0, /* CIE ID */
694 1, /* CIE version */
695 'z', 'R', 0, /* Augmentation string */
696 1, /* Code alignment factor */
697 0x78, /* Data alignment factor */
698 16, /* Return address column */
699 1, /* Augmentation size */
700 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
701 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
702 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
703 DW_CFA_nop, DW_CFA_nop,
704
705 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
706 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
707 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
708 0, 0, 0, 0, /* .plt size goes here */
709 0, /* Augmentation size */
710 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
711 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
712 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
713 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
714 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
715 11, /* Block length */
716 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
717 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
718 DW_OP_lit15, DW_OP_and, DW_OP_lit5, DW_OP_ge,
719 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
720 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
721 };
722
723 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
724
725 static const bfd_byte elf_x86_64_eh_frame_lazy_ibt_plt[] =
726 {
727 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
728 0, 0, 0, 0, /* CIE ID */
729 1, /* CIE version */
730 'z', 'R', 0, /* Augmentation string */
731 1, /* Code alignment factor */
732 0x78, /* Data alignment factor */
733 16, /* Return address column */
734 1, /* Augmentation size */
735 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
736 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
737 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
738 DW_CFA_nop, DW_CFA_nop,
739
740 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
741 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
742 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
743 0, 0, 0, 0, /* .plt size goes here */
744 0, /* Augmentation size */
745 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
746 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
747 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
748 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
749 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
750 11, /* Block length */
751 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
752 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
753 DW_OP_lit15, DW_OP_and, DW_OP_lit10, DW_OP_ge,
754 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
755 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
756 };
757
758 /* .eh_frame covering the x32 lazy .plt section with IBT-enabled. */
759
760 static const bfd_byte elf_x32_eh_frame_lazy_ibt_plt[] =
761 {
762 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
763 0, 0, 0, 0, /* CIE ID */
764 1, /* CIE version */
765 'z', 'R', 0, /* Augmentation string */
766 1, /* Code alignment factor */
767 0x78, /* Data alignment factor */
768 16, /* Return address column */
769 1, /* Augmentation size */
770 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
771 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
772 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
773 DW_CFA_nop, DW_CFA_nop,
774
775 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
776 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
777 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
778 0, 0, 0, 0, /* .plt size goes here */
779 0, /* Augmentation size */
780 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
781 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
782 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
783 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
784 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
785 11, /* Block length */
786 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
787 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
788 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
789 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
790 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
791 };
792
793 /* .eh_frame covering the non-lazy .plt section. */
794
795 static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt[] =
796 {
797 #define PLT_GOT_FDE_LENGTH 20
798 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
799 0, 0, 0, 0, /* CIE ID */
800 1, /* CIE version */
801 'z', 'R', 0, /* Augmentation string */
802 1, /* Code alignment factor */
803 0x78, /* Data alignment factor */
804 16, /* Return address column */
805 1, /* Augmentation size */
806 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
807 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
808 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
809 DW_CFA_nop, DW_CFA_nop,
810
811 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
812 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
813 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
814 0, 0, 0, 0, /* non-lazy .plt size goes here */
815 0, /* Augmentation size */
816 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop,
817 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
818 };
819
820 /* Architecture-specific backend data for x86-64. */
821
822 struct elf_x86_64_backend_data
823 {
824 /* Target system. */
825 enum
826 {
827 is_normal,
828 is_nacl
829 } os;
830 };
831
832 #define get_elf_x86_64_arch_data(bed) \
833 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
834
835 #define get_elf_x86_64_backend_data(abfd) \
836 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
837
838 /* These are the standard parameters. */
839 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt =
840 {
841 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
842 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
843 elf_x86_64_lazy_plt_entry, /* plt_entry */
844 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
845 2, /* plt0_got1_offset */
846 8, /* plt0_got2_offset */
847 12, /* plt0_got2_insn_end */
848 2, /* plt_got_offset */
849 7, /* plt_reloc_offset */
850 12, /* plt_plt_offset */
851 6, /* plt_got_insn_size */
852 LAZY_PLT_ENTRY_SIZE, /* plt_plt_insn_end */
853 6, /* plt_lazy_offset */
854 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */
855 elf_x86_64_lazy_plt_entry, /* pic_plt_entry */
856 elf_x86_64_eh_frame_lazy_plt, /* eh_frame_plt */
857 sizeof (elf_x86_64_eh_frame_lazy_plt) /* eh_frame_plt_size */
858 };
859
860 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_plt =
861 {
862 elf_x86_64_non_lazy_plt_entry, /* plt_entry */
863 elf_x86_64_non_lazy_plt_entry, /* pic_plt_entry */
864 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
865 2, /* plt_got_offset */
866 6, /* plt_got_insn_size */
867 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
868 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
869 };
870
871 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_bnd_plt =
872 {
873 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
874 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
875 elf_x86_64_lazy_bnd_plt_entry, /* plt_entry */
876 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
877 2, /* plt0_got1_offset */
878 1+8, /* plt0_got2_offset */
879 1+12, /* plt0_got2_insn_end */
880 1+2, /* plt_got_offset */
881 1, /* plt_reloc_offset */
882 7, /* plt_plt_offset */
883 1+6, /* plt_got_insn_size */
884 11, /* plt_plt_insn_end */
885 0, /* plt_lazy_offset */
886 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */
887 elf_x86_64_lazy_bnd_plt_entry, /* pic_plt_entry */
888 elf_x86_64_eh_frame_lazy_bnd_plt, /* eh_frame_plt */
889 sizeof (elf_x86_64_eh_frame_lazy_bnd_plt) /* eh_frame_plt_size */
890 };
891
892 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_bnd_plt =
893 {
894 elf_x86_64_non_lazy_bnd_plt_entry, /* plt_entry */
895 elf_x86_64_non_lazy_bnd_plt_entry, /* pic_plt_entry */
896 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
897 1+2, /* plt_got_offset */
898 1+6, /* plt_got_insn_size */
899 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
900 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
901 };
902
903 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_ibt_plt =
904 {
905 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
906 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
907 elf_x86_64_lazy_ibt_plt_entry, /* plt_entry */
908 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
909 2, /* plt0_got1_offset */
910 1+8, /* plt0_got2_offset */
911 1+12, /* plt0_got2_insn_end */
912 4+1+2, /* plt_got_offset */
913 4+1, /* plt_reloc_offset */
914 4+1+6, /* plt_plt_offset */
915 4+1+6, /* plt_got_insn_size */
916 4+1+5+5, /* plt_plt_insn_end */
917 0, /* plt_lazy_offset */
918 elf_x86_64_lazy_bnd_plt0_entry, /* pic_plt0_entry */
919 elf_x86_64_lazy_ibt_plt_entry, /* pic_plt_entry */
920 elf_x86_64_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
921 sizeof (elf_x86_64_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
922 };
923
924 static const struct elf_x86_lazy_plt_layout elf_x32_lazy_ibt_plt =
925 {
926 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
927 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
928 elf_x32_lazy_ibt_plt_entry, /* plt_entry */
929 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
930 2, /* plt0_got1_offset */
931 8, /* plt0_got2_offset */
932 12, /* plt0_got2_insn_end */
933 4+2, /* plt_got_offset */
934 4+1, /* plt_reloc_offset */
935 4+6, /* plt_plt_offset */
936 4+6, /* plt_got_insn_size */
937 4+5+5, /* plt_plt_insn_end */
938 0, /* plt_lazy_offset */
939 elf_x86_64_lazy_plt0_entry, /* pic_plt0_entry */
940 elf_x32_lazy_ibt_plt_entry, /* pic_plt_entry */
941 elf_x32_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
942 sizeof (elf_x32_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
943 };
944
945 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_ibt_plt =
946 {
947 elf_x86_64_non_lazy_ibt_plt_entry, /* plt_entry */
948 elf_x86_64_non_lazy_ibt_plt_entry, /* pic_plt_entry */
949 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
950 4+1+2, /* plt_got_offset */
951 4+1+6, /* plt_got_insn_size */
952 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
953 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
954 };
955
956 static const struct elf_x86_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt =
957 {
958 elf_x32_non_lazy_ibt_plt_entry, /* plt_entry */
959 elf_x32_non_lazy_ibt_plt_entry, /* pic_plt_entry */
960 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
961 4+2, /* plt_got_offset */
962 4+6, /* plt_got_insn_size */
963 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
964 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
965 };
966
967 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
968 {
969 is_normal /* os */
970 };
971
972 #define elf_backend_arch_data &elf_x86_64_arch_bed
973
974 static bfd_boolean
975 elf64_x86_64_elf_object_p (bfd *abfd)
976 {
977 /* Set the right machine number for an x86-64 elf64 file. */
978 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
979 return TRUE;
980 }
981
982 static bfd_boolean
983 elf32_x86_64_elf_object_p (bfd *abfd)
984 {
985 /* Set the right machine number for an x86-64 elf32 file. */
986 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
987 return TRUE;
988 }
989
990 /* Return TRUE if the TLS access code sequence support transition
991 from R_TYPE. */
992
993 static bfd_boolean
994 elf_x86_64_check_tls_transition (bfd *abfd,
995 struct bfd_link_info *info,
996 asection *sec,
997 bfd_byte *contents,
998 Elf_Internal_Shdr *symtab_hdr,
999 struct elf_link_hash_entry **sym_hashes,
1000 unsigned int r_type,
1001 const Elf_Internal_Rela *rel,
1002 const Elf_Internal_Rela *relend)
1003 {
1004 unsigned int val;
1005 unsigned long r_symndx;
1006 bfd_boolean largepic = FALSE;
1007 struct elf_link_hash_entry *h;
1008 bfd_vma offset;
1009 struct elf_x86_link_hash_table *htab;
1010 bfd_byte *call;
1011 bfd_boolean indirect_call;
1012
1013 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1014 offset = rel->r_offset;
1015 switch (r_type)
1016 {
1017 case R_X86_64_TLSGD:
1018 case R_X86_64_TLSLD:
1019 if ((rel + 1) >= relend)
1020 return FALSE;
1021
1022 if (r_type == R_X86_64_TLSGD)
1023 {
1024 /* Check transition from GD access model. For 64bit, only
1025 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1026 .word 0x6666; rex64; call __tls_get_addr@PLT
1027 or
1028 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1029 .byte 0x66; rex64
1030 call *__tls_get_addr@GOTPCREL(%rip)
1031 which may be converted to
1032 addr32 call __tls_get_addr
1033 can transit to different access model. For 32bit, only
1034 leaq foo@tlsgd(%rip), %rdi
1035 .word 0x6666; rex64; call __tls_get_addr@PLT
1036 or
1037 leaq foo@tlsgd(%rip), %rdi
1038 .byte 0x66; rex64
1039 call *__tls_get_addr@GOTPCREL(%rip)
1040 which may be converted to
1041 addr32 call __tls_get_addr
1042 can transit to different access model. For largepic,
1043 we also support:
1044 leaq foo@tlsgd(%rip), %rdi
1045 movabsq $__tls_get_addr@pltoff, %rax
1046 addq $r15, %rax
1047 call *%rax
1048 or
1049 leaq foo@tlsgd(%rip), %rdi
1050 movabsq $__tls_get_addr@pltoff, %rax
1051 addq $rbx, %rax
1052 call *%rax */
1053
1054 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1055
1056 if ((offset + 12) > sec->size)
1057 return FALSE;
1058
1059 call = contents + offset + 4;
1060 if (call[0] != 0x66
1061 || !((call[1] == 0x48
1062 && call[2] == 0xff
1063 && call[3] == 0x15)
1064 || (call[1] == 0x48
1065 && call[2] == 0x67
1066 && call[3] == 0xe8)
1067 || (call[1] == 0x66
1068 && call[2] == 0x48
1069 && call[3] == 0xe8)))
1070 {
1071 if (!ABI_64_P (abfd)
1072 || (offset + 19) > sec->size
1073 || offset < 3
1074 || memcmp (call - 7, leaq + 1, 3) != 0
1075 || memcmp (call, "\x48\xb8", 2) != 0
1076 || call[11] != 0x01
1077 || call[13] != 0xff
1078 || call[14] != 0xd0
1079 || !((call[10] == 0x48 && call[12] == 0xd8)
1080 || (call[10] == 0x4c && call[12] == 0xf8)))
1081 return FALSE;
1082 largepic = TRUE;
1083 }
1084 else if (ABI_64_P (abfd))
1085 {
1086 if (offset < 4
1087 || memcmp (contents + offset - 4, leaq, 4) != 0)
1088 return FALSE;
1089 }
1090 else
1091 {
1092 if (offset < 3
1093 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1094 return FALSE;
1095 }
1096 indirect_call = call[2] == 0xff;
1097 }
1098 else
1099 {
1100 /* Check transition from LD access model. Only
1101 leaq foo@tlsld(%rip), %rdi;
1102 call __tls_get_addr@PLT
1103 or
1104 leaq foo@tlsld(%rip), %rdi;
1105 call *__tls_get_addr@GOTPCREL(%rip)
1106 which may be converted to
1107 addr32 call __tls_get_addr
1108 can transit to different access model. For largepic
1109 we also support:
1110 leaq foo@tlsld(%rip), %rdi
1111 movabsq $__tls_get_addr@pltoff, %rax
1112 addq $r15, %rax
1113 call *%rax
1114 or
1115 leaq foo@tlsld(%rip), %rdi
1116 movabsq $__tls_get_addr@pltoff, %rax
1117 addq $rbx, %rax
1118 call *%rax */
1119
1120 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1121
1122 if (offset < 3 || (offset + 9) > sec->size)
1123 return FALSE;
1124
1125 if (memcmp (contents + offset - 3, lea, 3) != 0)
1126 return FALSE;
1127
1128 call = contents + offset + 4;
1129 if (!(call[0] == 0xe8
1130 || (call[0] == 0xff && call[1] == 0x15)
1131 || (call[0] == 0x67 && call[1] == 0xe8)))
1132 {
1133 if (!ABI_64_P (abfd)
1134 || (offset + 19) > sec->size
1135 || memcmp (call, "\x48\xb8", 2) != 0
1136 || call[11] != 0x01
1137 || call[13] != 0xff
1138 || call[14] != 0xd0
1139 || !((call[10] == 0x48 && call[12] == 0xd8)
1140 || (call[10] == 0x4c && call[12] == 0xf8)))
1141 return FALSE;
1142 largepic = TRUE;
1143 }
1144 indirect_call = call[0] == 0xff;
1145 }
1146
1147 r_symndx = htab->r_sym (rel[1].r_info);
1148 if (r_symndx < symtab_hdr->sh_info)
1149 return FALSE;
1150
1151 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1152 if (h == NULL
1153 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
1154 return FALSE;
1155 else
1156 {
1157 r_type = (ELF32_R_TYPE (rel[1].r_info)
1158 & ~R_X86_64_converted_reloc_bit);
1159 if (largepic)
1160 return r_type == R_X86_64_PLTOFF64;
1161 else if (indirect_call)
1162 return r_type == R_X86_64_GOTPCRELX;
1163 else
1164 return (r_type == R_X86_64_PC32 || r_type == R_X86_64_PLT32);
1165 }
1166
1167 case R_X86_64_GOTTPOFF:
1168 /* Check transition from IE access model:
1169 mov foo@gottpoff(%rip), %reg
1170 add foo@gottpoff(%rip), %reg
1171 */
1172
1173 /* Check REX prefix first. */
1174 if (offset >= 3 && (offset + 4) <= sec->size)
1175 {
1176 val = bfd_get_8 (abfd, contents + offset - 3);
1177 if (val != 0x48 && val != 0x4c)
1178 {
1179 /* X32 may have 0x44 REX prefix or no REX prefix. */
1180 if (ABI_64_P (abfd))
1181 return FALSE;
1182 }
1183 }
1184 else
1185 {
1186 /* X32 may not have any REX prefix. */
1187 if (ABI_64_P (abfd))
1188 return FALSE;
1189 if (offset < 2 || (offset + 3) > sec->size)
1190 return FALSE;
1191 }
1192
1193 val = bfd_get_8 (abfd, contents + offset - 2);
1194 if (val != 0x8b && val != 0x03)
1195 return FALSE;
1196
1197 val = bfd_get_8 (abfd, contents + offset - 1);
1198 return (val & 0xc7) == 5;
1199
1200 case R_X86_64_GOTPC32_TLSDESC:
1201 /* Check transition from GDesc access model:
1202 leaq x@tlsdesc(%rip), %rax
1203
1204 Make sure it's a leaq adding rip to a 32-bit offset
1205 into any register, although it's probably almost always
1206 going to be rax. */
1207
1208 if (offset < 3 || (offset + 4) > sec->size)
1209 return FALSE;
1210
1211 val = bfd_get_8 (abfd, contents + offset - 3);
1212 if ((val & 0xfb) != 0x48)
1213 return FALSE;
1214
1215 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1216 return FALSE;
1217
1218 val = bfd_get_8 (abfd, contents + offset - 1);
1219 return (val & 0xc7) == 0x05;
1220
1221 case R_X86_64_TLSDESC_CALL:
1222 /* Check transition from GDesc access model:
1223 call *x@tlsdesc(%rax)
1224 */
1225 if (offset + 2 <= sec->size)
1226 {
1227 /* Make sure that it's a call *x@tlsdesc(%rax). */
1228 call = contents + offset;
1229 return call[0] == 0xff && call[1] == 0x10;
1230 }
1231
1232 return FALSE;
1233
1234 default:
1235 abort ();
1236 }
1237 }
1238
1239 /* Return TRUE if the TLS access transition is OK or no transition
1240 will be performed. Update R_TYPE if there is a transition. */
1241
1242 static bfd_boolean
1243 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1244 asection *sec, bfd_byte *contents,
1245 Elf_Internal_Shdr *symtab_hdr,
1246 struct elf_link_hash_entry **sym_hashes,
1247 unsigned int *r_type, int tls_type,
1248 const Elf_Internal_Rela *rel,
1249 const Elf_Internal_Rela *relend,
1250 struct elf_link_hash_entry *h,
1251 unsigned long r_symndx,
1252 bfd_boolean from_relocate_section)
1253 {
1254 unsigned int from_type = *r_type;
1255 unsigned int to_type = from_type;
1256 bfd_boolean check = TRUE;
1257
1258 /* Skip TLS transition for functions. */
1259 if (h != NULL
1260 && (h->type == STT_FUNC
1261 || h->type == STT_GNU_IFUNC))
1262 return TRUE;
1263
1264 switch (from_type)
1265 {
1266 case R_X86_64_TLSGD:
1267 case R_X86_64_GOTPC32_TLSDESC:
1268 case R_X86_64_TLSDESC_CALL:
1269 case R_X86_64_GOTTPOFF:
1270 if (bfd_link_executable (info))
1271 {
1272 if (h == NULL)
1273 to_type = R_X86_64_TPOFF32;
1274 else
1275 to_type = R_X86_64_GOTTPOFF;
1276 }
1277
1278 /* When we are called from elf_x86_64_relocate_section, there may
1279 be additional transitions based on TLS_TYPE. */
1280 if (from_relocate_section)
1281 {
1282 unsigned int new_to_type = to_type;
1283
1284 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1285 new_to_type = R_X86_64_TPOFF32;
1286
1287 if (to_type == R_X86_64_TLSGD
1288 || to_type == R_X86_64_GOTPC32_TLSDESC
1289 || to_type == R_X86_64_TLSDESC_CALL)
1290 {
1291 if (tls_type == GOT_TLS_IE)
1292 new_to_type = R_X86_64_GOTTPOFF;
1293 }
1294
1295 /* We checked the transition before when we were called from
1296 elf_x86_64_check_relocs. We only want to check the new
1297 transition which hasn't been checked before. */
1298 check = new_to_type != to_type && from_type == to_type;
1299 to_type = new_to_type;
1300 }
1301
1302 break;
1303
1304 case R_X86_64_TLSLD:
1305 if (bfd_link_executable (info))
1306 to_type = R_X86_64_TPOFF32;
1307 break;
1308
1309 default:
1310 return TRUE;
1311 }
1312
1313 /* Return TRUE if there is no transition. */
1314 if (from_type == to_type)
1315 return TRUE;
1316
1317 /* Check if the transition can be performed. */
1318 if (check
1319 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1320 symtab_hdr, sym_hashes,
1321 from_type, rel, relend))
1322 {
1323 reloc_howto_type *from, *to;
1324 const char *name;
1325
1326 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1327 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1328
1329 if (h)
1330 name = h->root.root.string;
1331 else
1332 {
1333 struct elf_x86_link_hash_table *htab;
1334
1335 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1336 if (htab == NULL)
1337 name = "*unknown*";
1338 else
1339 {
1340 Elf_Internal_Sym *isym;
1341
1342 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1343 abfd, r_symndx);
1344 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1345 }
1346 }
1347
1348 _bfd_error_handler
1349 /* xgettext:c-format */
1350 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1351 "in section `%A' failed"),
1352 abfd, from->name, to->name, name, rel->r_offset, sec);
1353 bfd_set_error (bfd_error_bad_value);
1354 return FALSE;
1355 }
1356
1357 *r_type = to_type;
1358 return TRUE;
1359 }
1360
1361 /* Rename some of the generic section flags to better document how they
1362 are used here. */
1363 #define check_relocs_failed sec_flg0
1364
1365 static bfd_boolean
1366 elf_x86_64_need_pic (struct bfd_link_info *info,
1367 bfd *input_bfd, asection *sec,
1368 struct elf_link_hash_entry *h,
1369 Elf_Internal_Shdr *symtab_hdr,
1370 Elf_Internal_Sym *isym,
1371 reloc_howto_type *howto)
1372 {
1373 const char *v = "";
1374 const char *und = "";
1375 const char *pic = "";
1376 const char *object;
1377
1378 const char *name;
1379 if (h)
1380 {
1381 name = h->root.root.string;
1382 switch (ELF_ST_VISIBILITY (h->other))
1383 {
1384 case STV_HIDDEN:
1385 v = _("hidden symbol ");
1386 break;
1387 case STV_INTERNAL:
1388 v = _("internal symbol ");
1389 break;
1390 case STV_PROTECTED:
1391 v = _("protected symbol ");
1392 break;
1393 default:
1394 if (((struct elf_x86_link_hash_entry *) h)->def_protected)
1395 v = _("protected symbol ");
1396 else
1397 v = _("symbol ");
1398 pic = _("; recompile with -fPIC");
1399 break;
1400 }
1401
1402 if (!h->def_regular && !h->def_dynamic)
1403 und = _("undefined ");
1404 }
1405 else
1406 {
1407 name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL);
1408 pic = _("; recompile with -fPIC");
1409 }
1410
1411 if (bfd_link_dll (info))
1412 object = _("a shared object");
1413 else if (bfd_link_pie (info))
1414 object = _("a PIE object");
1415 else
1416 object = _("a PDE object");
1417
1418 /* xgettext:c-format */
1419 _bfd_error_handler (_("%B: relocation %s against %s%s`%s' can "
1420 "not be used when making %s%s"),
1421 input_bfd, howto->name, und, v, name,
1422 object, pic);
1423 bfd_set_error (bfd_error_bad_value);
1424 sec->check_relocs_failed = 1;
1425 return FALSE;
1426 }
1427
1428 /* With the local symbol, foo, we convert
1429 mov foo@GOTPCREL(%rip), %reg
1430 to
1431 lea foo(%rip), %reg
1432 and convert
1433 call/jmp *foo@GOTPCREL(%rip)
1434 to
1435 nop call foo/jmp foo nop
1436 When PIC is false, convert
1437 test %reg, foo@GOTPCREL(%rip)
1438 to
1439 test $foo, %reg
1440 and convert
1441 binop foo@GOTPCREL(%rip), %reg
1442 to
1443 binop $foo, %reg
1444 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1445 instructions. */
1446
1447 static bfd_boolean
1448 elf_x86_64_convert_load_reloc (bfd *abfd,
1449 bfd_byte *contents,
1450 unsigned int *r_type_p,
1451 Elf_Internal_Rela *irel,
1452 struct elf_link_hash_entry *h,
1453 bfd_boolean *converted,
1454 struct bfd_link_info *link_info)
1455 {
1456 struct elf_x86_link_hash_table *htab;
1457 bfd_boolean is_pic;
1458 bfd_boolean no_overflow;
1459 bfd_boolean relocx;
1460 bfd_boolean to_reloc_pc32;
1461 asection *tsec;
1462 bfd_signed_vma raddend;
1463 unsigned int opcode;
1464 unsigned int modrm;
1465 unsigned int r_type = *r_type_p;
1466 unsigned int r_symndx;
1467 bfd_vma roff = irel->r_offset;
1468
1469 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
1470 return TRUE;
1471
1472 raddend = irel->r_addend;
1473 /* Addend for 32-bit PC-relative relocation must be -4. */
1474 if (raddend != -4)
1475 return TRUE;
1476
1477 htab = elf_x86_hash_table (link_info, X86_64_ELF_DATA);
1478 is_pic = bfd_link_pic (link_info);
1479
1480 relocx = (r_type == R_X86_64_GOTPCRELX
1481 || r_type == R_X86_64_REX_GOTPCRELX);
1482
1483 /* TRUE if --no-relax is used. */
1484 no_overflow = link_info->disable_target_specific_optimizations > 1;
1485
1486 r_symndx = htab->r_sym (irel->r_info);
1487
1488 opcode = bfd_get_8 (abfd, contents + roff - 2);
1489
1490 /* Convert mov to lea since it has been done for a while. */
1491 if (opcode != 0x8b)
1492 {
1493 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
1494 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
1495 test, xor instructions. */
1496 if (!relocx)
1497 return TRUE;
1498 }
1499
1500 /* We convert only to R_X86_64_PC32:
1501 1. Branch.
1502 2. R_X86_64_GOTPCREL since we can't modify REX byte.
1503 3. no_overflow is true.
1504 4. PIC.
1505 */
1506 to_reloc_pc32 = (opcode == 0xff
1507 || !relocx
1508 || no_overflow
1509 || is_pic);
1510
1511 /* Get the symbol referred to by the reloc. */
1512 if (h == NULL)
1513 {
1514 Elf_Internal_Sym *isym
1515 = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx);
1516
1517 /* Skip relocation against undefined symbols. */
1518 if (isym->st_shndx == SHN_UNDEF)
1519 return TRUE;
1520
1521 if (isym->st_shndx == SHN_ABS)
1522 tsec = bfd_abs_section_ptr;
1523 else if (isym->st_shndx == SHN_COMMON)
1524 tsec = bfd_com_section_ptr;
1525 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
1526 tsec = &_bfd_elf_large_com_section;
1527 else
1528 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1529 }
1530 else
1531 {
1532 /* Undefined weak symbol is only bound locally in executable
1533 and its reference is resolved as 0 without relocation
1534 overflow. We can only perform this optimization for
1535 GOTPCRELX relocations since we need to modify REX byte.
1536 It is OK convert mov with R_X86_64_GOTPCREL to
1537 R_X86_64_PC32. */
1538 bfd_boolean local_ref;
1539 struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h);
1540
1541 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1542 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1543 if ((relocx || opcode == 0x8b)
1544 && (h->root.type == bfd_link_hash_undefweak
1545 && !eh->linker_def
1546 && local_ref))
1547 {
1548 if (opcode == 0xff)
1549 {
1550 /* Skip for branch instructions since R_X86_64_PC32
1551 may overflow. */
1552 if (no_overflow)
1553 return TRUE;
1554 }
1555 else if (relocx)
1556 {
1557 /* For non-branch instructions, we can convert to
1558 R_X86_64_32/R_X86_64_32S since we know if there
1559 is a REX byte. */
1560 to_reloc_pc32 = FALSE;
1561 }
1562
1563 /* Since we don't know the current PC when PIC is true,
1564 we can't convert to R_X86_64_PC32. */
1565 if (to_reloc_pc32 && is_pic)
1566 return TRUE;
1567
1568 goto convert;
1569 }
1570 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
1571 ld.so may use its link-time address. */
1572 else if (h->start_stop
1573 || eh->linker_def
1574 || ((h->def_regular
1575 || h->root.type == bfd_link_hash_defined
1576 || h->root.type == bfd_link_hash_defweak)
1577 && h != htab->elf.hdynamic
1578 && local_ref))
1579 {
1580 /* bfd_link_hash_new or bfd_link_hash_undefined is
1581 set by an assignment in a linker script in
1582 bfd_elf_record_link_assignment. start_stop is set
1583 on __start_SECNAME/__stop_SECNAME which mark section
1584 SECNAME. */
1585 if (h->start_stop
1586 || eh->linker_def
1587 || (h->def_regular
1588 && (h->root.type == bfd_link_hash_new
1589 || h->root.type == bfd_link_hash_undefined
1590 || ((h->root.type == bfd_link_hash_defined
1591 || h->root.type == bfd_link_hash_defweak)
1592 && h->root.u.def.section == bfd_und_section_ptr))))
1593 {
1594 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
1595 if (no_overflow)
1596 return TRUE;
1597 goto convert;
1598 }
1599 tsec = h->root.u.def.section;
1600 }
1601 else
1602 return TRUE;
1603 }
1604
1605 /* Don't convert GOTPCREL relocation against large section. */
1606 if (elf_section_data (tsec) != NULL
1607 && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0)
1608 return TRUE;
1609
1610 /* Skip since R_X86_64_PC32/R_X86_64_32/R_X86_64_32S may overflow. */
1611 if (no_overflow)
1612 return TRUE;
1613
1614 convert:
1615 if (opcode == 0xff)
1616 {
1617 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
1618 unsigned int nop;
1619 unsigned int disp;
1620 bfd_vma nop_offset;
1621
1622 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
1623 R_X86_64_PC32. */
1624 modrm = bfd_get_8 (abfd, contents + roff - 1);
1625 if (modrm == 0x25)
1626 {
1627 /* Convert to "jmp foo nop". */
1628 modrm = 0xe9;
1629 nop = NOP_OPCODE;
1630 nop_offset = irel->r_offset + 3;
1631 disp = bfd_get_32 (abfd, contents + irel->r_offset);
1632 irel->r_offset -= 1;
1633 bfd_put_32 (abfd, disp, contents + irel->r_offset);
1634 }
1635 else
1636 {
1637 struct elf_x86_link_hash_entry *eh
1638 = (struct elf_x86_link_hash_entry *) h;
1639
1640 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1641 is a nop prefix. */
1642 modrm = 0xe8;
1643 /* To support TLS optimization, always use addr32 prefix for
1644 "call *__tls_get_addr@GOTPCREL(%rip)". */
1645 if (eh && eh->tls_get_addr)
1646 {
1647 nop = 0x67;
1648 nop_offset = irel->r_offset - 2;
1649 }
1650 else
1651 {
1652 nop = link_info->call_nop_byte;
1653 if (link_info->call_nop_as_suffix)
1654 {
1655 nop_offset = irel->r_offset + 3;
1656 disp = bfd_get_32 (abfd, contents + irel->r_offset);
1657 irel->r_offset -= 1;
1658 bfd_put_32 (abfd, disp, contents + irel->r_offset);
1659 }
1660 else
1661 nop_offset = irel->r_offset - 2;
1662 }
1663 }
1664 bfd_put_8 (abfd, nop, contents + nop_offset);
1665 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1666 r_type = R_X86_64_PC32;
1667 }
1668 else
1669 {
1670 unsigned int rex;
1671 unsigned int rex_mask = REX_R;
1672
1673 if (r_type == R_X86_64_REX_GOTPCRELX)
1674 rex = bfd_get_8 (abfd, contents + roff - 3);
1675 else
1676 rex = 0;
1677
1678 if (opcode == 0x8b)
1679 {
1680 if (to_reloc_pc32)
1681 {
1682 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1683 "lea foo(%rip), %reg". */
1684 opcode = 0x8d;
1685 r_type = R_X86_64_PC32;
1686 }
1687 else
1688 {
1689 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1690 "mov $foo, %reg". */
1691 opcode = 0xc7;
1692 modrm = bfd_get_8 (abfd, contents + roff - 1);
1693 modrm = 0xc0 | (modrm & 0x38) >> 3;
1694 if ((rex & REX_W) != 0
1695 && ABI_64_P (link_info->output_bfd))
1696 {
1697 /* Keep the REX_W bit in REX byte for LP64. */
1698 r_type = R_X86_64_32S;
1699 goto rewrite_modrm_rex;
1700 }
1701 else
1702 {
1703 /* If the REX_W bit in REX byte isn't needed,
1704 use R_X86_64_32 and clear the W bit to avoid
1705 sign-extend imm32 to imm64. */
1706 r_type = R_X86_64_32;
1707 /* Clear the W bit in REX byte. */
1708 rex_mask |= REX_W;
1709 goto rewrite_modrm_rex;
1710 }
1711 }
1712 }
1713 else
1714 {
1715 /* R_X86_64_PC32 isn't supported. */
1716 if (to_reloc_pc32)
1717 return TRUE;
1718
1719 modrm = bfd_get_8 (abfd, contents + roff - 1);
1720 if (opcode == 0x85)
1721 {
1722 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
1723 "test $foo, %reg". */
1724 modrm = 0xc0 | (modrm & 0x38) >> 3;
1725 opcode = 0xf7;
1726 }
1727 else
1728 {
1729 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
1730 "binop $foo, %reg". */
1731 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
1732 opcode = 0x81;
1733 }
1734
1735 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
1736 overflow when sign-extending imm32 to imm64. */
1737 r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32;
1738
1739 rewrite_modrm_rex:
1740 bfd_put_8 (abfd, modrm, contents + roff - 1);
1741
1742 if (rex)
1743 {
1744 /* Move the R bit to the B bit in REX byte. */
1745 rex = (rex & ~rex_mask) | (rex & REX_R) >> 2;
1746 bfd_put_8 (abfd, rex, contents + roff - 3);
1747 }
1748
1749 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
1750 irel->r_addend = 0;
1751 }
1752
1753 bfd_put_8 (abfd, opcode, contents + roff - 2);
1754 }
1755
1756 *r_type_p = r_type;
1757 irel->r_info = htab->r_info (r_symndx,
1758 r_type | R_X86_64_converted_reloc_bit);
1759
1760 *converted = TRUE;
1761
1762 return TRUE;
1763 }
1764
1765 /* Look through the relocs for a section during the first phase, and
1766 calculate needed space in the global offset table, procedure
1767 linkage table, and dynamic reloc sections. */
1768
1769 static bfd_boolean
1770 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1771 asection *sec,
1772 const Elf_Internal_Rela *relocs)
1773 {
1774 struct elf_x86_link_hash_table *htab;
1775 Elf_Internal_Shdr *symtab_hdr;
1776 struct elf_link_hash_entry **sym_hashes;
1777 const Elf_Internal_Rela *rel;
1778 const Elf_Internal_Rela *rel_end;
1779 asection *sreloc;
1780 bfd_byte *contents;
1781 bfd_boolean converted;
1782
1783 if (bfd_link_relocatable (info))
1784 return TRUE;
1785
1786 /* Don't do anything special with non-loaded, non-alloced sections.
1787 In particular, any relocs in such sections should not affect GOT
1788 and PLT reference counting (ie. we don't allow them to create GOT
1789 or PLT entries), there's no possibility or desire to optimize TLS
1790 relocs, and there's not much point in propagating relocs to shared
1791 libs that the dynamic linker won't relocate. */
1792 if ((sec->flags & SEC_ALLOC) == 0)
1793 return TRUE;
1794
1795 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1796 if (htab == NULL)
1797 {
1798 sec->check_relocs_failed = 1;
1799 return FALSE;
1800 }
1801
1802 BFD_ASSERT (is_x86_elf (abfd, htab));
1803
1804 /* Get the section contents. */
1805 if (elf_section_data (sec)->this_hdr.contents != NULL)
1806 contents = elf_section_data (sec)->this_hdr.contents;
1807 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1808 {
1809 sec->check_relocs_failed = 1;
1810 return FALSE;
1811 }
1812
1813 symtab_hdr = &elf_symtab_hdr (abfd);
1814 sym_hashes = elf_sym_hashes (abfd);
1815
1816 converted = FALSE;
1817
1818 sreloc = NULL;
1819
1820 rel_end = relocs + sec->reloc_count;
1821 for (rel = relocs; rel < rel_end; rel++)
1822 {
1823 unsigned int r_type;
1824 unsigned int r_symndx;
1825 struct elf_link_hash_entry *h;
1826 struct elf_x86_link_hash_entry *eh;
1827 Elf_Internal_Sym *isym;
1828 const char *name;
1829 bfd_boolean size_reloc;
1830 bfd_boolean converted_reloc;
1831
1832 r_symndx = htab->r_sym (rel->r_info);
1833 r_type = ELF32_R_TYPE (rel->r_info);
1834
1835 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1836 {
1837 /* xgettext:c-format */
1838 _bfd_error_handler (_("%B: bad symbol index: %d"),
1839 abfd, r_symndx);
1840 goto error_return;
1841 }
1842
1843 if (r_symndx < symtab_hdr->sh_info)
1844 {
1845 /* A local symbol. */
1846 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1847 abfd, r_symndx);
1848 if (isym == NULL)
1849 goto error_return;
1850
1851 /* Check relocation against local STT_GNU_IFUNC symbol. */
1852 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1853 {
1854 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel,
1855 TRUE);
1856 if (h == NULL)
1857 goto error_return;
1858
1859 /* Fake a STT_GNU_IFUNC symbol. */
1860 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1861 isym, NULL);
1862 h->type = STT_GNU_IFUNC;
1863 h->def_regular = 1;
1864 h->ref_regular = 1;
1865 h->forced_local = 1;
1866 h->root.type = bfd_link_hash_defined;
1867 }
1868 else
1869 h = NULL;
1870 }
1871 else
1872 {
1873 isym = NULL;
1874 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1875 while (h->root.type == bfd_link_hash_indirect
1876 || h->root.type == bfd_link_hash_warning)
1877 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1878 }
1879
1880 /* Check invalid x32 relocations. */
1881 if (!ABI_64_P (abfd))
1882 switch (r_type)
1883 {
1884 default:
1885 break;
1886
1887 case R_X86_64_DTPOFF64:
1888 case R_X86_64_TPOFF64:
1889 case R_X86_64_PC64:
1890 case R_X86_64_GOTOFF64:
1891 case R_X86_64_GOT64:
1892 case R_X86_64_GOTPCREL64:
1893 case R_X86_64_GOTPC64:
1894 case R_X86_64_GOTPLT64:
1895 case R_X86_64_PLTOFF64:
1896 {
1897 if (h)
1898 name = h->root.root.string;
1899 else
1900 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1901 NULL);
1902 _bfd_error_handler
1903 /* xgettext:c-format */
1904 (_("%B: relocation %s against symbol `%s' isn't "
1905 "supported in x32 mode"), abfd,
1906 x86_64_elf_howto_table[r_type].name, name);
1907 bfd_set_error (bfd_error_bad_value);
1908 goto error_return;
1909 }
1910 break;
1911 }
1912
1913 if (h != NULL)
1914 {
1915 /* It is referenced by a non-shared object. */
1916 h->ref_regular = 1;
1917 h->root.non_ir_ref_regular = 1;
1918
1919 if (h->type == STT_GNU_IFUNC)
1920 elf_tdata (info->output_bfd)->has_gnu_symbols
1921 |= elf_gnu_symbol_ifunc;
1922 }
1923
1924 converted_reloc = FALSE;
1925 if ((r_type == R_X86_64_GOTPCREL
1926 || r_type == R_X86_64_GOTPCRELX
1927 || r_type == R_X86_64_REX_GOTPCRELX)
1928 && (h == NULL || h->type != STT_GNU_IFUNC))
1929 {
1930 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1931 if (!elf_x86_64_convert_load_reloc (abfd, contents, &r_type,
1932 irel, h, &converted_reloc,
1933 info))
1934 goto error_return;
1935
1936 if (converted_reloc)
1937 converted = TRUE;
1938 }
1939
1940 if (! elf_x86_64_tls_transition (info, abfd, sec, contents,
1941 symtab_hdr, sym_hashes,
1942 &r_type, GOT_UNKNOWN,
1943 rel, rel_end, h, r_symndx, FALSE))
1944 goto error_return;
1945
1946 eh = (struct elf_x86_link_hash_entry *) h;
1947 switch (r_type)
1948 {
1949 case R_X86_64_TLSLD:
1950 htab->tls_ld_or_ldm_got.refcount += 1;
1951 goto create_got;
1952
1953 case R_X86_64_TPOFF32:
1954 if (!bfd_link_executable (info) && ABI_64_P (abfd))
1955 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
1956 &x86_64_elf_howto_table[r_type]);
1957 if (eh != NULL)
1958 eh->has_got_reloc = 1;
1959 break;
1960
1961 case R_X86_64_GOTTPOFF:
1962 if (!bfd_link_executable (info))
1963 info->flags |= DF_STATIC_TLS;
1964 /* Fall through */
1965
1966 case R_X86_64_GOT32:
1967 case R_X86_64_GOTPCREL:
1968 case R_X86_64_GOTPCRELX:
1969 case R_X86_64_REX_GOTPCRELX:
1970 case R_X86_64_TLSGD:
1971 case R_X86_64_GOT64:
1972 case R_X86_64_GOTPCREL64:
1973 case R_X86_64_GOTPLT64:
1974 case R_X86_64_GOTPC32_TLSDESC:
1975 case R_X86_64_TLSDESC_CALL:
1976 /* This symbol requires a global offset table entry. */
1977 {
1978 int tls_type, old_tls_type;
1979
1980 switch (r_type)
1981 {
1982 default: tls_type = GOT_NORMAL; break;
1983 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1984 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1985 case R_X86_64_GOTPC32_TLSDESC:
1986 case R_X86_64_TLSDESC_CALL:
1987 tls_type = GOT_TLS_GDESC; break;
1988 }
1989
1990 if (h != NULL)
1991 {
1992 h->got.refcount += 1;
1993 old_tls_type = eh->tls_type;
1994 }
1995 else
1996 {
1997 bfd_signed_vma *local_got_refcounts;
1998
1999 /* This is a global offset table entry for a local symbol. */
2000 local_got_refcounts = elf_local_got_refcounts (abfd);
2001 if (local_got_refcounts == NULL)
2002 {
2003 bfd_size_type size;
2004
2005 size = symtab_hdr->sh_info;
2006 size *= sizeof (bfd_signed_vma)
2007 + sizeof (bfd_vma) + sizeof (char);
2008 local_got_refcounts = ((bfd_signed_vma *)
2009 bfd_zalloc (abfd, size));
2010 if (local_got_refcounts == NULL)
2011 goto error_return;
2012 elf_local_got_refcounts (abfd) = local_got_refcounts;
2013 elf_x86_local_tlsdesc_gotent (abfd)
2014 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2015 elf_x86_local_got_tls_type (abfd)
2016 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2017 }
2018 local_got_refcounts[r_symndx] += 1;
2019 old_tls_type
2020 = elf_x86_local_got_tls_type (abfd) [r_symndx];
2021 }
2022
2023 /* If a TLS symbol is accessed using IE at least once,
2024 there is no point to use dynamic model for it. */
2025 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2026 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2027 || tls_type != GOT_TLS_IE))
2028 {
2029 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
2030 tls_type = old_tls_type;
2031 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2032 && GOT_TLS_GD_ANY_P (tls_type))
2033 tls_type |= old_tls_type;
2034 else
2035 {
2036 if (h)
2037 name = h->root.root.string;
2038 else
2039 name = bfd_elf_sym_name (abfd, symtab_hdr,
2040 isym, NULL);
2041 _bfd_error_handler
2042 /* xgettext:c-format */
2043 (_("%B: '%s' accessed both as normal and"
2044 " thread local symbol"),
2045 abfd, name);
2046 bfd_set_error (bfd_error_bad_value);
2047 goto error_return;
2048 }
2049 }
2050
2051 if (old_tls_type != tls_type)
2052 {
2053 if (eh != NULL)
2054 eh->tls_type = tls_type;
2055 else
2056 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
2057 }
2058 }
2059 /* Fall through */
2060
2061 case R_X86_64_GOTOFF64:
2062 case R_X86_64_GOTPC32:
2063 case R_X86_64_GOTPC64:
2064 create_got:
2065 if (eh != NULL)
2066 eh->has_got_reloc = 1;
2067 break;
2068
2069 case R_X86_64_PLT32:
2070 case R_X86_64_PLT32_BND:
2071 /* This symbol requires a procedure linkage table entry. We
2072 actually build the entry in adjust_dynamic_symbol,
2073 because this might be a case of linking PIC code which is
2074 never referenced by a dynamic object, in which case we
2075 don't need to generate a procedure linkage table entry
2076 after all. */
2077
2078 /* If this is a local symbol, we resolve it directly without
2079 creating a procedure linkage table entry. */
2080 if (h == NULL)
2081 continue;
2082
2083 eh->has_got_reloc = 1;
2084 h->needs_plt = 1;
2085 h->plt.refcount += 1;
2086 break;
2087
2088 case R_X86_64_PLTOFF64:
2089 /* This tries to form the 'address' of a function relative
2090 to GOT. For global symbols we need a PLT entry. */
2091 if (h != NULL)
2092 {
2093 h->needs_plt = 1;
2094 h->plt.refcount += 1;
2095 }
2096 goto create_got;
2097
2098 case R_X86_64_SIZE32:
2099 case R_X86_64_SIZE64:
2100 size_reloc = TRUE;
2101 goto do_size;
2102
2103 case R_X86_64_32:
2104 if (!ABI_64_P (abfd))
2105 goto pointer;
2106 /* Fall through. */
2107 case R_X86_64_8:
2108 case R_X86_64_16:
2109 case R_X86_64_32S:
2110 /* Check relocation overflow as these relocs may lead to
2111 run-time relocation overflow. Don't error out for
2112 sections we don't care about, such as debug sections or
2113 when relocation overflow check is disabled. */
2114 if (!info->no_reloc_overflow_check
2115 && !converted_reloc
2116 && (bfd_link_pic (info)
2117 || (bfd_link_executable (info)
2118 && h != NULL
2119 && !h->def_regular
2120 && h->def_dynamic
2121 && (sec->flags & SEC_READONLY) == 0)))
2122 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
2123 &x86_64_elf_howto_table[r_type]);
2124 /* Fall through. */
2125
2126 case R_X86_64_PC8:
2127 case R_X86_64_PC16:
2128 case R_X86_64_PC32:
2129 case R_X86_64_PC32_BND:
2130 case R_X86_64_PC64:
2131 case R_X86_64_64:
2132 pointer:
2133 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2134 eh->has_non_got_reloc = 1;
2135 /* We are called after all symbols have been resolved. Only
2136 relocation against STT_GNU_IFUNC symbol must go through
2137 PLT. */
2138 if (h != NULL
2139 && (bfd_link_executable (info)
2140 || h->type == STT_GNU_IFUNC))
2141 {
2142 /* If this reloc is in a read-only section, we might
2143 need a copy reloc. We can't check reliably at this
2144 stage whether the section is read-only, as input
2145 sections have not yet been mapped to output sections.
2146 Tentatively set the flag for now, and correct in
2147 adjust_dynamic_symbol. */
2148 h->non_got_ref = 1;
2149
2150 /* We may need a .plt entry if the symbol is a function
2151 defined in a shared lib or is a STT_GNU_IFUNC function
2152 referenced from the code or read-only section. */
2153 if (!h->def_regular
2154 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2155 h->plt.refcount += 1;
2156
2157 if (r_type == R_X86_64_PC32)
2158 {
2159 /* Since something like ".long foo - ." may be used
2160 as pointer, make sure that PLT is used if foo is
2161 a function defined in a shared library. */
2162 if ((sec->flags & SEC_CODE) == 0)
2163 h->pointer_equality_needed = 1;
2164 }
2165 else if (r_type != R_X86_64_PC32_BND
2166 && r_type != R_X86_64_PC64)
2167 {
2168 h->pointer_equality_needed = 1;
2169 /* At run-time, R_X86_64_64 can be resolved for both
2170 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2171 can only be resolved for x32. */
2172 if ((sec->flags & SEC_READONLY) == 0
2173 && (r_type == R_X86_64_64
2174 || (!ABI_64_P (abfd)
2175 && (r_type == R_X86_64_32
2176 || r_type == R_X86_64_32S))))
2177 eh->func_pointer_refcount += 1;
2178 }
2179 }
2180
2181 size_reloc = FALSE;
2182 do_size:
2183 if (NEED_DYNAMIC_RELOCATION_P (info, h, sec, r_type,
2184 htab->pointer_r_type))
2185 {
2186 struct elf_dyn_relocs *p;
2187 struct elf_dyn_relocs **head;
2188
2189 /* We must copy these reloc types into the output file.
2190 Create a reloc section in dynobj and make room for
2191 this reloc. */
2192 if (sreloc == NULL)
2193 {
2194 sreloc = _bfd_elf_make_dynamic_reloc_section
2195 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2196 abfd, /*rela?*/ TRUE);
2197
2198 if (sreloc == NULL)
2199 goto error_return;
2200 }
2201
2202 /* If this is a global symbol, we count the number of
2203 relocations we need for this symbol. */
2204 if (h != NULL)
2205 head = &eh->dyn_relocs;
2206 else
2207 {
2208 /* Track dynamic relocs needed for local syms too.
2209 We really need local syms available to do this
2210 easily. Oh well. */
2211 asection *s;
2212 void **vpp;
2213
2214 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2215 abfd, r_symndx);
2216 if (isym == NULL)
2217 goto error_return;
2218
2219 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2220 if (s == NULL)
2221 s = sec;
2222
2223 /* Beware of type punned pointers vs strict aliasing
2224 rules. */
2225 vpp = &(elf_section_data (s)->local_dynrel);
2226 head = (struct elf_dyn_relocs **)vpp;
2227 }
2228
2229 p = *head;
2230 if (p == NULL || p->sec != sec)
2231 {
2232 bfd_size_type amt = sizeof *p;
2233
2234 p = ((struct elf_dyn_relocs *)
2235 bfd_alloc (htab->elf.dynobj, amt));
2236 if (p == NULL)
2237 goto error_return;
2238 p->next = *head;
2239 *head = p;
2240 p->sec = sec;
2241 p->count = 0;
2242 p->pc_count = 0;
2243 }
2244
2245 p->count += 1;
2246 /* Count size relocation as PC-relative relocation. */
2247 if (X86_PCREL_TYPE_P (r_type) || size_reloc)
2248 p->pc_count += 1;
2249 }
2250 break;
2251
2252 /* This relocation describes the C++ object vtable hierarchy.
2253 Reconstruct it for later use during GC. */
2254 case R_X86_64_GNU_VTINHERIT:
2255 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2256 goto error_return;
2257 break;
2258
2259 /* This relocation describes which C++ vtable entries are actually
2260 used. Record for later use during GC. */
2261 case R_X86_64_GNU_VTENTRY:
2262 BFD_ASSERT (h != NULL);
2263 if (h != NULL
2264 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2265 goto error_return;
2266 break;
2267
2268 default:
2269 break;
2270 }
2271 }
2272
2273 if (elf_section_data (sec)->this_hdr.contents != contents)
2274 {
2275 if (!converted && !info->keep_memory)
2276 free (contents);
2277 else
2278 {
2279 /* Cache the section contents for elf_link_input_bfd if any
2280 load is converted or --no-keep-memory isn't used. */
2281 elf_section_data (sec)->this_hdr.contents = contents;
2282 }
2283 }
2284
2285 /* Cache relocations if any load is converted. */
2286 if (elf_section_data (sec)->relocs != relocs && converted)
2287 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
2288
2289 return TRUE;
2290
2291 error_return:
2292 if (elf_section_data (sec)->this_hdr.contents != contents)
2293 free (contents);
2294 sec->check_relocs_failed = 1;
2295 return FALSE;
2296 }
2297
2298 /* Return the relocation value for @tpoff relocation
2299 if STT_TLS virtual address is ADDRESS. */
2300
2301 static bfd_vma
2302 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
2303 {
2304 struct elf_link_hash_table *htab = elf_hash_table (info);
2305 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2306 bfd_vma static_tls_size;
2307
2308 /* If tls_segment is NULL, we should have signalled an error already. */
2309 if (htab->tls_sec == NULL)
2310 return 0;
2311
2312 /* Consider special static TLS alignment requirements. */
2313 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2314 return address - static_tls_size - htab->tls_sec->vma;
2315 }
2316
2317 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2318 branch? */
2319
2320 static bfd_boolean
2321 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
2322 {
2323 /* Opcode Instruction
2324 0xe8 call
2325 0xe9 jump
2326 0x0f 0x8x conditional jump */
2327 return ((offset > 0
2328 && (contents [offset - 1] == 0xe8
2329 || contents [offset - 1] == 0xe9))
2330 || (offset > 1
2331 && contents [offset - 2] == 0x0f
2332 && (contents [offset - 1] & 0xf0) == 0x80));
2333 }
2334
2335 /* Relocate an x86_64 ELF section. */
2336
2337 static bfd_boolean
2338 elf_x86_64_relocate_section (bfd *output_bfd,
2339 struct bfd_link_info *info,
2340 bfd *input_bfd,
2341 asection *input_section,
2342 bfd_byte *contents,
2343 Elf_Internal_Rela *relocs,
2344 Elf_Internal_Sym *local_syms,
2345 asection **local_sections)
2346 {
2347 struct elf_x86_link_hash_table *htab;
2348 Elf_Internal_Shdr *symtab_hdr;
2349 struct elf_link_hash_entry **sym_hashes;
2350 bfd_vma *local_got_offsets;
2351 bfd_vma *local_tlsdesc_gotents;
2352 Elf_Internal_Rela *rel;
2353 Elf_Internal_Rela *wrel;
2354 Elf_Internal_Rela *relend;
2355 unsigned int plt_entry_size;
2356
2357 /* Skip if check_relocs failed. */
2358 if (input_section->check_relocs_failed)
2359 return FALSE;
2360
2361 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
2362 if (htab == NULL)
2363 return FALSE;
2364
2365 BFD_ASSERT (is_x86_elf (input_bfd, htab));
2366
2367 plt_entry_size = htab->plt.plt_entry_size;
2368 symtab_hdr = &elf_symtab_hdr (input_bfd);
2369 sym_hashes = elf_sym_hashes (input_bfd);
2370 local_got_offsets = elf_local_got_offsets (input_bfd);
2371 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2372
2373 _bfd_x86_elf_set_tls_module_base (info);
2374
2375 rel = wrel = relocs;
2376 relend = relocs + input_section->reloc_count;
2377 for (; rel < relend; wrel++, rel++)
2378 {
2379 unsigned int r_type, r_type_tls;
2380 reloc_howto_type *howto;
2381 unsigned long r_symndx;
2382 struct elf_link_hash_entry *h;
2383 struct elf_x86_link_hash_entry *eh;
2384 Elf_Internal_Sym *sym;
2385 asection *sec;
2386 bfd_vma off, offplt, plt_offset;
2387 bfd_vma relocation;
2388 bfd_boolean unresolved_reloc;
2389 bfd_reloc_status_type r;
2390 int tls_type;
2391 asection *base_got, *resolved_plt;
2392 bfd_vma st_size;
2393 bfd_boolean resolved_to_zero;
2394 bfd_boolean relative_reloc;
2395 bfd_boolean converted_reloc;
2396
2397 r_type = ELF32_R_TYPE (rel->r_info);
2398 if (r_type == (int) R_X86_64_GNU_VTINHERIT
2399 || r_type == (int) R_X86_64_GNU_VTENTRY)
2400 {
2401 if (wrel != rel)
2402 *wrel = *rel;
2403 continue;
2404 }
2405
2406 converted_reloc = (r_type & R_X86_64_converted_reloc_bit) != 0;
2407 r_type &= ~R_X86_64_converted_reloc_bit;
2408
2409 if (r_type >= (int) R_X86_64_standard)
2410 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2411
2412 if (r_type != (int) R_X86_64_32
2413 || ABI_64_P (output_bfd))
2414 howto = x86_64_elf_howto_table + r_type;
2415 else
2416 howto = (x86_64_elf_howto_table
2417 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
2418 r_symndx = htab->r_sym (rel->r_info);
2419 h = NULL;
2420 sym = NULL;
2421 sec = NULL;
2422 unresolved_reloc = FALSE;
2423 if (r_symndx < symtab_hdr->sh_info)
2424 {
2425 sym = local_syms + r_symndx;
2426 sec = local_sections[r_symndx];
2427
2428 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
2429 &sec, rel);
2430 st_size = sym->st_size;
2431
2432 /* Relocate against local STT_GNU_IFUNC symbol. */
2433 if (!bfd_link_relocatable (info)
2434 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2435 {
2436 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd,
2437 rel, FALSE);
2438 if (h == NULL)
2439 abort ();
2440
2441 /* Set STT_GNU_IFUNC symbol value. */
2442 h->root.u.def.value = sym->st_value;
2443 h->root.u.def.section = sec;
2444 }
2445 }
2446 else
2447 {
2448 bfd_boolean warned ATTRIBUTE_UNUSED;
2449 bfd_boolean ignored ATTRIBUTE_UNUSED;
2450
2451 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2452 r_symndx, symtab_hdr, sym_hashes,
2453 h, sec, relocation,
2454 unresolved_reloc, warned, ignored);
2455 st_size = h->size;
2456 }
2457
2458 if (sec != NULL && discarded_section (sec))
2459 {
2460 _bfd_clear_contents (howto, input_bfd, input_section,
2461 contents + rel->r_offset);
2462 wrel->r_offset = rel->r_offset;
2463 wrel->r_info = 0;
2464 wrel->r_addend = 0;
2465
2466 /* For ld -r, remove relocations in debug sections against
2467 sections defined in discarded sections. Not done for
2468 eh_frame editing code expects to be present. */
2469 if (bfd_link_relocatable (info)
2470 && (input_section->flags & SEC_DEBUGGING))
2471 wrel--;
2472
2473 continue;
2474 }
2475
2476 if (bfd_link_relocatable (info))
2477 {
2478 if (wrel != rel)
2479 *wrel = *rel;
2480 continue;
2481 }
2482
2483 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
2484 {
2485 if (r_type == R_X86_64_64)
2486 {
2487 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
2488 zero-extend it to 64bit if addend is zero. */
2489 r_type = R_X86_64_32;
2490 memset (contents + rel->r_offset + 4, 0, 4);
2491 }
2492 else if (r_type == R_X86_64_SIZE64)
2493 {
2494 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
2495 zero-extend it to 64bit if addend is zero. */
2496 r_type = R_X86_64_SIZE32;
2497 memset (contents + rel->r_offset + 4, 0, 4);
2498 }
2499 }
2500
2501 eh = (struct elf_x86_link_hash_entry *) h;
2502
2503 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2504 it here if it is defined in a non-shared object. */
2505 if (h != NULL
2506 && h->type == STT_GNU_IFUNC
2507 && h->def_regular)
2508 {
2509 bfd_vma plt_index;
2510 const char *name;
2511
2512 if ((input_section->flags & SEC_ALLOC) == 0)
2513 {
2514 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2515 sections because such sections are not SEC_ALLOC and
2516 thus ld.so will not process them. */
2517 if ((input_section->flags & SEC_DEBUGGING) != 0)
2518 continue;
2519 abort ();
2520 }
2521
2522 switch (r_type)
2523 {
2524 default:
2525 break;
2526
2527 case R_X86_64_GOTPCREL:
2528 case R_X86_64_GOTPCRELX:
2529 case R_X86_64_REX_GOTPCRELX:
2530 case R_X86_64_GOTPCREL64:
2531 base_got = htab->elf.sgot;
2532 off = h->got.offset;
2533
2534 if (base_got == NULL)
2535 abort ();
2536
2537 if (off == (bfd_vma) -1)
2538 {
2539 /* We can't use h->got.offset here to save state, or
2540 even just remember the offset, as finish_dynamic_symbol
2541 would use that as offset into .got. */
2542
2543 if (h->plt.offset == (bfd_vma) -1)
2544 abort ();
2545
2546 if (htab->elf.splt != NULL)
2547 {
2548 plt_index = (h->plt.offset / plt_entry_size
2549 - htab->plt.has_plt0);
2550 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2551 base_got = htab->elf.sgotplt;
2552 }
2553 else
2554 {
2555 plt_index = h->plt.offset / plt_entry_size;
2556 off = plt_index * GOT_ENTRY_SIZE;
2557 base_got = htab->elf.igotplt;
2558 }
2559
2560 if (h->dynindx == -1
2561 || h->forced_local
2562 || info->symbolic)
2563 {
2564 /* This references the local defitionion. We must
2565 initialize this entry in the global offset table.
2566 Since the offset must always be a multiple of 8,
2567 we use the least significant bit to record
2568 whether we have initialized it already.
2569
2570 When doing a dynamic link, we create a .rela.got
2571 relocation entry to initialize the value. This
2572 is done in the finish_dynamic_symbol routine. */
2573 if ((off & 1) != 0)
2574 off &= ~1;
2575 else
2576 {
2577 bfd_put_64 (output_bfd, relocation,
2578 base_got->contents + off);
2579 /* Note that this is harmless for the GOTPLT64
2580 case, as -1 | 1 still is -1. */
2581 h->got.offset |= 1;
2582 }
2583 }
2584 }
2585
2586 relocation = (base_got->output_section->vma
2587 + base_got->output_offset + off);
2588
2589 goto do_relocation;
2590 }
2591
2592 if (h->plt.offset == (bfd_vma) -1)
2593 {
2594 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2595 if (r_type == htab->pointer_r_type
2596 && (input_section->flags & SEC_CODE) == 0)
2597 goto do_ifunc_pointer;
2598 goto bad_ifunc_reloc;
2599 }
2600
2601 /* STT_GNU_IFUNC symbol must go through PLT. */
2602 if (htab->elf.splt != NULL)
2603 {
2604 if (htab->plt_second != NULL)
2605 {
2606 resolved_plt = htab->plt_second;
2607 plt_offset = eh->plt_second.offset;
2608 }
2609 else
2610 {
2611 resolved_plt = htab->elf.splt;
2612 plt_offset = h->plt.offset;
2613 }
2614 }
2615 else
2616 {
2617 resolved_plt = htab->elf.iplt;
2618 plt_offset = h->plt.offset;
2619 }
2620
2621 relocation = (resolved_plt->output_section->vma
2622 + resolved_plt->output_offset + plt_offset);
2623
2624 switch (r_type)
2625 {
2626 default:
2627 bad_ifunc_reloc:
2628 if (h->root.root.string)
2629 name = h->root.root.string;
2630 else
2631 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2632 NULL);
2633 _bfd_error_handler
2634 /* xgettext:c-format */
2635 (_("%B: relocation %s against STT_GNU_IFUNC "
2636 "symbol `%s' isn't supported"), input_bfd,
2637 howto->name, name);
2638 bfd_set_error (bfd_error_bad_value);
2639 return FALSE;
2640
2641 case R_X86_64_32S:
2642 if (bfd_link_pic (info))
2643 abort ();
2644 goto do_relocation;
2645
2646 case R_X86_64_32:
2647 if (ABI_64_P (output_bfd))
2648 goto do_relocation;
2649 /* FALLTHROUGH */
2650 case R_X86_64_64:
2651 do_ifunc_pointer:
2652 if (rel->r_addend != 0)
2653 {
2654 if (h->root.root.string)
2655 name = h->root.root.string;
2656 else
2657 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
2658 sym, NULL);
2659 _bfd_error_handler
2660 /* xgettext:c-format */
2661 (_("%B: relocation %s against STT_GNU_IFUNC "
2662 "symbol `%s' has non-zero addend: %Ld"),
2663 input_bfd, howto->name, name, rel->r_addend);
2664 bfd_set_error (bfd_error_bad_value);
2665 return FALSE;
2666 }
2667
2668 /* Generate dynamic relcoation only when there is a
2669 non-GOT reference in a shared object or there is no
2670 PLT. */
2671 if ((bfd_link_pic (info) && h->non_got_ref)
2672 || h->plt.offset == (bfd_vma) -1)
2673 {
2674 Elf_Internal_Rela outrel;
2675 asection *sreloc;
2676
2677 /* Need a dynamic relocation to get the real function
2678 address. */
2679 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2680 info,
2681 input_section,
2682 rel->r_offset);
2683 if (outrel.r_offset == (bfd_vma) -1
2684 || outrel.r_offset == (bfd_vma) -2)
2685 abort ();
2686
2687 outrel.r_offset += (input_section->output_section->vma
2688 + input_section->output_offset);
2689
2690 if (POINTER_LOCAL_IFUNC_P (info, h))
2691 {
2692 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
2693 h->root.root.string,
2694 h->root.u.def.section->owner);
2695
2696 /* This symbol is resolved locally. */
2697 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
2698 outrel.r_addend = (h->root.u.def.value
2699 + h->root.u.def.section->output_section->vma
2700 + h->root.u.def.section->output_offset);
2701 }
2702 else
2703 {
2704 outrel.r_info = htab->r_info (h->dynindx, r_type);
2705 outrel.r_addend = 0;
2706 }
2707
2708 /* Dynamic relocations are stored in
2709 1. .rela.ifunc section in PIC object.
2710 2. .rela.got section in dynamic executable.
2711 3. .rela.iplt section in static executable. */
2712 if (bfd_link_pic (info))
2713 sreloc = htab->elf.irelifunc;
2714 else if (htab->elf.splt != NULL)
2715 sreloc = htab->elf.srelgot;
2716 else
2717 sreloc = htab->elf.irelplt;
2718 elf_append_rela (output_bfd, sreloc, &outrel);
2719
2720 /* If this reloc is against an external symbol, we
2721 do not want to fiddle with the addend. Otherwise,
2722 we need to include the symbol value so that it
2723 becomes an addend for the dynamic reloc. For an
2724 internal symbol, we have updated addend. */
2725 continue;
2726 }
2727 /* FALLTHROUGH */
2728 case R_X86_64_PC32:
2729 case R_X86_64_PC32_BND:
2730 case R_X86_64_PC64:
2731 case R_X86_64_PLT32:
2732 case R_X86_64_PLT32_BND:
2733 goto do_relocation;
2734 }
2735 }
2736
2737 resolved_to_zero = (eh != NULL
2738 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2739
2740 /* When generating a shared object, the relocations handled here are
2741 copied into the output file to be resolved at run time. */
2742 switch (r_type)
2743 {
2744 case R_X86_64_GOT32:
2745 case R_X86_64_GOT64:
2746 /* Relocation is to the entry for this symbol in the global
2747 offset table. */
2748 case R_X86_64_GOTPCREL:
2749 case R_X86_64_GOTPCRELX:
2750 case R_X86_64_REX_GOTPCRELX:
2751 case R_X86_64_GOTPCREL64:
2752 /* Use global offset table entry as symbol value. */
2753 case R_X86_64_GOTPLT64:
2754 /* This is obsolete and treated the same as GOT64. */
2755 base_got = htab->elf.sgot;
2756
2757 if (htab->elf.sgot == NULL)
2758 abort ();
2759
2760 relative_reloc = FALSE;
2761 if (h != NULL)
2762 {
2763 off = h->got.offset;
2764 if (h->needs_plt
2765 && h->plt.offset != (bfd_vma)-1
2766 && off == (bfd_vma)-1)
2767 {
2768 /* We can't use h->got.offset here to save
2769 state, or even just remember the offset, as
2770 finish_dynamic_symbol would use that as offset into
2771 .got. */
2772 bfd_vma plt_index = (h->plt.offset / plt_entry_size
2773 - htab->plt.has_plt0);
2774 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2775 base_got = htab->elf.sgotplt;
2776 }
2777
2778 if (RESOLVED_LOCALLY_P (info, h, htab))
2779 {
2780 /* We must initialize this entry in the global offset
2781 table. Since the offset must always be a multiple
2782 of 8, we use the least significant bit to record
2783 whether we have initialized it already.
2784
2785 When doing a dynamic link, we create a .rela.got
2786 relocation entry to initialize the value. This is
2787 done in the finish_dynamic_symbol routine. */
2788 if ((off & 1) != 0)
2789 off &= ~1;
2790 else
2791 {
2792 bfd_put_64 (output_bfd, relocation,
2793 base_got->contents + off);
2794 /* Note that this is harmless for the GOTPLT64 case,
2795 as -1 | 1 still is -1. */
2796 h->got.offset |= 1;
2797
2798 if (GENERATE_RELATIVE_RELOC_P (info, h))
2799 {
2800 /* If this symbol isn't dynamic in PIC,
2801 generate R_X86_64_RELATIVE here. */
2802 eh->no_finish_dynamic_symbol = 1;
2803 relative_reloc = TRUE;
2804 }
2805 }
2806 }
2807 else
2808 unresolved_reloc = FALSE;
2809 }
2810 else
2811 {
2812 if (local_got_offsets == NULL)
2813 abort ();
2814
2815 off = local_got_offsets[r_symndx];
2816
2817 /* The offset must always be a multiple of 8. We use
2818 the least significant bit to record whether we have
2819 already generated the necessary reloc. */
2820 if ((off & 1) != 0)
2821 off &= ~1;
2822 else
2823 {
2824 bfd_put_64 (output_bfd, relocation,
2825 base_got->contents + off);
2826 local_got_offsets[r_symndx] |= 1;
2827
2828 if (bfd_link_pic (info))
2829 relative_reloc = TRUE;
2830 }
2831 }
2832
2833 if (relative_reloc)
2834 {
2835 asection *s;
2836 Elf_Internal_Rela outrel;
2837
2838 /* We need to generate a R_X86_64_RELATIVE reloc
2839 for the dynamic linker. */
2840 s = htab->elf.srelgot;
2841 if (s == NULL)
2842 abort ();
2843
2844 outrel.r_offset = (base_got->output_section->vma
2845 + base_got->output_offset
2846 + off);
2847 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
2848 outrel.r_addend = relocation;
2849 elf_append_rela (output_bfd, s, &outrel);
2850 }
2851
2852 if (off >= (bfd_vma) -2)
2853 abort ();
2854
2855 relocation = base_got->output_section->vma
2856 + base_got->output_offset + off;
2857 if (r_type != R_X86_64_GOTPCREL
2858 && r_type != R_X86_64_GOTPCRELX
2859 && r_type != R_X86_64_REX_GOTPCRELX
2860 && r_type != R_X86_64_GOTPCREL64)
2861 relocation -= htab->elf.sgotplt->output_section->vma
2862 - htab->elf.sgotplt->output_offset;
2863
2864 break;
2865
2866 case R_X86_64_GOTOFF64:
2867 /* Relocation is relative to the start of the global offset
2868 table. */
2869
2870 /* Check to make sure it isn't a protected function or data
2871 symbol for shared library since it may not be local when
2872 used as function address or with copy relocation. We also
2873 need to make sure that a symbol is referenced locally. */
2874 if (bfd_link_pic (info) && h)
2875 {
2876 if (!h->def_regular)
2877 {
2878 const char *v;
2879
2880 switch (ELF_ST_VISIBILITY (h->other))
2881 {
2882 case STV_HIDDEN:
2883 v = _("hidden symbol");
2884 break;
2885 case STV_INTERNAL:
2886 v = _("internal symbol");
2887 break;
2888 case STV_PROTECTED:
2889 v = _("protected symbol");
2890 break;
2891 default:
2892 v = _("symbol");
2893 break;
2894 }
2895
2896 _bfd_error_handler
2897 /* xgettext:c-format */
2898 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s"
2899 " `%s' can not be used when making a shared object"),
2900 input_bfd, v, h->root.root.string);
2901 bfd_set_error (bfd_error_bad_value);
2902 return FALSE;
2903 }
2904 else if (!bfd_link_executable (info)
2905 && !SYMBOL_REFERENCES_LOCAL_P (info, h)
2906 && (h->type == STT_FUNC
2907 || h->type == STT_OBJECT)
2908 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2909 {
2910 _bfd_error_handler
2911 /* xgettext:c-format */
2912 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s"
2913 " `%s' can not be used when making a shared object"),
2914 input_bfd,
2915 h->type == STT_FUNC ? "function" : "data",
2916 h->root.root.string);
2917 bfd_set_error (bfd_error_bad_value);
2918 return FALSE;
2919 }
2920 }
2921
2922 /* Note that sgot is not involved in this
2923 calculation. We always want the start of .got.plt. If we
2924 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2925 permitted by the ABI, we might have to change this
2926 calculation. */
2927 relocation -= htab->elf.sgotplt->output_section->vma
2928 + htab->elf.sgotplt->output_offset;
2929 break;
2930
2931 case R_X86_64_GOTPC32:
2932 case R_X86_64_GOTPC64:
2933 /* Use global offset table as symbol value. */
2934 relocation = htab->elf.sgotplt->output_section->vma
2935 + htab->elf.sgotplt->output_offset;
2936 unresolved_reloc = FALSE;
2937 break;
2938
2939 case R_X86_64_PLTOFF64:
2940 /* Relocation is PLT entry relative to GOT. For local
2941 symbols it's the symbol itself relative to GOT. */
2942 if (h != NULL
2943 /* See PLT32 handling. */
2944 && (h->plt.offset != (bfd_vma) -1
2945 || eh->plt_got.offset != (bfd_vma) -1)
2946 && htab->elf.splt != NULL)
2947 {
2948 if (eh->plt_got.offset != (bfd_vma) -1)
2949 {
2950 /* Use the GOT PLT. */
2951 resolved_plt = htab->plt_got;
2952 plt_offset = eh->plt_got.offset;
2953 }
2954 else if (htab->plt_second != NULL)
2955 {
2956 resolved_plt = htab->plt_second;
2957 plt_offset = eh->plt_second.offset;
2958 }
2959 else
2960 {
2961 resolved_plt = htab->elf.splt;
2962 plt_offset = h->plt.offset;
2963 }
2964
2965 relocation = (resolved_plt->output_section->vma
2966 + resolved_plt->output_offset
2967 + plt_offset);
2968 unresolved_reloc = FALSE;
2969 }
2970
2971 relocation -= htab->elf.sgotplt->output_section->vma
2972 + htab->elf.sgotplt->output_offset;
2973 break;
2974
2975 case R_X86_64_PLT32:
2976 case R_X86_64_PLT32_BND:
2977 /* Relocation is to the entry for this symbol in the
2978 procedure linkage table. */
2979
2980 /* Resolve a PLT32 reloc against a local symbol directly,
2981 without using the procedure linkage table. */
2982 if (h == NULL)
2983 break;
2984
2985 if ((h->plt.offset == (bfd_vma) -1
2986 && eh->plt_got.offset == (bfd_vma) -1)
2987 || htab->elf.splt == NULL)
2988 {
2989 /* We didn't make a PLT entry for this symbol. This
2990 happens when statically linking PIC code, or when
2991 using -Bsymbolic. */
2992 break;
2993 }
2994
2995 if (h->plt.offset != (bfd_vma) -1)
2996 {
2997 if (htab->plt_second != NULL)
2998 {
2999 resolved_plt = htab->plt_second;
3000 plt_offset = eh->plt_second.offset;
3001 }
3002 else
3003 {
3004 resolved_plt = htab->elf.splt;
3005 plt_offset = h->plt.offset;
3006 }
3007 }
3008 else
3009 {
3010 /* Use the GOT PLT. */
3011 resolved_plt = htab->plt_got;
3012 plt_offset = eh->plt_got.offset;
3013 }
3014
3015 relocation = (resolved_plt->output_section->vma
3016 + resolved_plt->output_offset
3017 + plt_offset);
3018 unresolved_reloc = FALSE;
3019 break;
3020
3021 case R_X86_64_SIZE32:
3022 case R_X86_64_SIZE64:
3023 /* Set to symbol size. */
3024 relocation = st_size;
3025 goto direct;
3026
3027 case R_X86_64_PC8:
3028 case R_X86_64_PC16:
3029 case R_X86_64_PC32:
3030 case R_X86_64_PC32_BND:
3031 /* Don't complain about -fPIC if the symbol is undefined when
3032 building executable unless it is unresolved weak symbol or
3033 -z nocopyreloc is used. */
3034 if ((input_section->flags & SEC_ALLOC) != 0
3035 && (input_section->flags & SEC_READONLY) != 0
3036 && h != NULL
3037 && ((bfd_link_executable (info)
3038 && ((h->root.type == bfd_link_hash_undefweak
3039 && !resolved_to_zero)
3040 || ((info->nocopyreloc
3041 || (eh->def_protected
3042 && elf_has_no_copy_on_protected (h->root.u.def.section->owner)))
3043 && h->def_dynamic
3044 && !(h->root.u.def.section->flags & SEC_CODE))))
3045 || bfd_link_dll (info)))
3046 {
3047 bfd_boolean fail = FALSE;
3048 bfd_boolean branch
3049 = ((r_type == R_X86_64_PC32
3050 || r_type == R_X86_64_PC32_BND)
3051 && is_32bit_relative_branch (contents, rel->r_offset));
3052
3053 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3054 {
3055 /* Symbol is referenced locally. Make sure it is
3056 defined locally or for a branch. */
3057 fail = (!(h->def_regular || ELF_COMMON_DEF_P (h))
3058 && !branch);
3059 }
3060 else if (!(bfd_link_pie (info)
3061 && (h->needs_copy || eh->needs_copy)))
3062 {
3063 /* Symbol doesn't need copy reloc and isn't referenced
3064 locally. We only allow branch to symbol with
3065 non-default visibility. */
3066 fail = (!branch
3067 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3068 }
3069
3070 if (fail)
3071 return elf_x86_64_need_pic (info, input_bfd, input_section,
3072 h, NULL, NULL, howto);
3073 }
3074 /* Fall through. */
3075
3076 case R_X86_64_8:
3077 case R_X86_64_16:
3078 case R_X86_64_32:
3079 case R_X86_64_PC64:
3080 case R_X86_64_64:
3081 /* FIXME: The ABI says the linker should make sure the value is
3082 the same when it's zeroextended to 64 bit. */
3083
3084 direct:
3085 if ((input_section->flags & SEC_ALLOC) == 0)
3086 break;
3087
3088 /* Don't copy a pc-relative relocation into the output file
3089 if the symbol needs copy reloc or the symbol is undefined
3090 when building executable. Copy dynamic function pointer
3091 relocations. Don't generate dynamic relocations against
3092 resolved undefined weak symbols in PIE. */
3093 if ((bfd_link_pic (info)
3094 && !(bfd_link_pie (info)
3095 && h != NULL
3096 && (h->needs_copy
3097 || eh->needs_copy
3098 || h->root.type == bfd_link_hash_undefined)
3099 && (X86_PCREL_TYPE_P (r_type)
3100 || r_type == R_X86_64_SIZE32
3101 || r_type == R_X86_64_SIZE64))
3102 && (h == NULL
3103 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3104 && !resolved_to_zero)
3105 || h->root.type != bfd_link_hash_undefweak))
3106 && ((! X86_PCREL_TYPE_P (r_type)
3107 && r_type != R_X86_64_SIZE32
3108 && r_type != R_X86_64_SIZE64)
3109 || ! SYMBOL_CALLS_LOCAL (info, h)))
3110 || (ELIMINATE_COPY_RELOCS
3111 && !bfd_link_pic (info)
3112 && h != NULL
3113 && h->dynindx != -1
3114 && (!h->non_got_ref
3115 || eh->func_pointer_refcount > 0
3116 || (h->root.type == bfd_link_hash_undefweak
3117 && !resolved_to_zero))
3118 && ((h->def_dynamic && !h->def_regular)
3119 /* Undefined weak symbol is bound locally when
3120 PIC is false. */
3121 || h->root.type == bfd_link_hash_undefined)))
3122 {
3123 Elf_Internal_Rela outrel;
3124 bfd_boolean skip, relocate;
3125 asection *sreloc;
3126
3127 /* When generating a shared object, these relocations
3128 are copied into the output file to be resolved at run
3129 time. */
3130 skip = FALSE;
3131 relocate = FALSE;
3132
3133 outrel.r_offset =
3134 _bfd_elf_section_offset (output_bfd, info, input_section,
3135 rel->r_offset);
3136 if (outrel.r_offset == (bfd_vma) -1)
3137 skip = TRUE;
3138 else if (outrel.r_offset == (bfd_vma) -2)
3139 skip = TRUE, relocate = TRUE;
3140
3141 outrel.r_offset += (input_section->output_section->vma
3142 + input_section->output_offset);
3143
3144 if (skip)
3145 memset (&outrel, 0, sizeof outrel);
3146
3147 /* h->dynindx may be -1 if this symbol was marked to
3148 become local. */
3149 else if (h != NULL
3150 && h->dynindx != -1
3151 && (X86_PCREL_TYPE_P (r_type)
3152 || !(bfd_link_executable (info)
3153 || SYMBOLIC_BIND (info, h))
3154 || ! h->def_regular))
3155 {
3156 outrel.r_info = htab->r_info (h->dynindx, r_type);
3157 outrel.r_addend = rel->r_addend;
3158 }
3159 else
3160 {
3161 /* This symbol is local, or marked to become local.
3162 When relocation overflow check is disabled, we
3163 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
3164 if (r_type == htab->pointer_r_type
3165 || (r_type == R_X86_64_32
3166 && info->no_reloc_overflow_check))
3167 {
3168 relocate = TRUE;
3169 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3170 outrel.r_addend = relocation + rel->r_addend;
3171 }
3172 else if (r_type == R_X86_64_64
3173 && !ABI_64_P (output_bfd))
3174 {
3175 relocate = TRUE;
3176 outrel.r_info = htab->r_info (0,
3177 R_X86_64_RELATIVE64);
3178 outrel.r_addend = relocation + rel->r_addend;
3179 /* Check addend overflow. */
3180 if ((outrel.r_addend & 0x80000000)
3181 != (rel->r_addend & 0x80000000))
3182 {
3183 const char *name;
3184 int addend = rel->r_addend;
3185 if (h && h->root.root.string)
3186 name = h->root.root.string;
3187 else
3188 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3189 sym, NULL);
3190 _bfd_error_handler
3191 /* xgettext:c-format */
3192 (_("%B: addend %s%#x in relocation %s against "
3193 "symbol `%s' at %#Lx in section `%A' is "
3194 "out of range"),
3195 input_bfd, addend < 0 ? "-" : "", addend,
3196 howto->name, name, rel->r_offset, input_section);
3197 bfd_set_error (bfd_error_bad_value);
3198 return FALSE;
3199 }
3200 }
3201 else
3202 {
3203 long sindx;
3204
3205 if (bfd_is_abs_section (sec))
3206 sindx = 0;
3207 else if (sec == NULL || sec->owner == NULL)
3208 {
3209 bfd_set_error (bfd_error_bad_value);
3210 return FALSE;
3211 }
3212 else
3213 {
3214 asection *osec;
3215
3216 /* We are turning this relocation into one
3217 against a section symbol. It would be
3218 proper to subtract the symbol's value,
3219 osec->vma, from the emitted reloc addend,
3220 but ld.so expects buggy relocs. */
3221 osec = sec->output_section;
3222 sindx = elf_section_data (osec)->dynindx;
3223 if (sindx == 0)
3224 {
3225 asection *oi = htab->elf.text_index_section;
3226 sindx = elf_section_data (oi)->dynindx;
3227 }
3228 BFD_ASSERT (sindx != 0);
3229 }
3230
3231 outrel.r_info = htab->r_info (sindx, r_type);
3232 outrel.r_addend = relocation + rel->r_addend;
3233 }
3234 }
3235
3236 sreloc = elf_section_data (input_section)->sreloc;
3237
3238 if (sreloc == NULL || sreloc->contents == NULL)
3239 {
3240 r = bfd_reloc_notsupported;
3241 goto check_relocation_error;
3242 }
3243
3244 elf_append_rela (output_bfd, sreloc, &outrel);
3245
3246 /* If this reloc is against an external symbol, we do
3247 not want to fiddle with the addend. Otherwise, we
3248 need to include the symbol value so that it becomes
3249 an addend for the dynamic reloc. */
3250 if (! relocate)
3251 continue;
3252 }
3253
3254 break;
3255
3256 case R_X86_64_TLSGD:
3257 case R_X86_64_GOTPC32_TLSDESC:
3258 case R_X86_64_TLSDESC_CALL:
3259 case R_X86_64_GOTTPOFF:
3260 tls_type = GOT_UNKNOWN;
3261 if (h == NULL && local_got_offsets)
3262 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
3263 else if (h != NULL)
3264 tls_type = elf_x86_hash_entry (h)->tls_type;
3265
3266 r_type_tls = r_type;
3267 if (! elf_x86_64_tls_transition (info, input_bfd,
3268 input_section, contents,
3269 symtab_hdr, sym_hashes,
3270 &r_type_tls, tls_type, rel,
3271 relend, h, r_symndx, TRUE))
3272 return FALSE;
3273
3274 if (r_type_tls == R_X86_64_TPOFF32)
3275 {
3276 bfd_vma roff = rel->r_offset;
3277
3278 BFD_ASSERT (! unresolved_reloc);
3279
3280 if (r_type == R_X86_64_TLSGD)
3281 {
3282 /* GD->LE transition. For 64bit, change
3283 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3284 .word 0x6666; rex64; call __tls_get_addr@PLT
3285 or
3286 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3287 .byte 0x66; rex64
3288 call *__tls_get_addr@GOTPCREL(%rip)
3289 which may be converted to
3290 addr32 call __tls_get_addr
3291 into:
3292 movq %fs:0, %rax
3293 leaq foo@tpoff(%rax), %rax
3294 For 32bit, change
3295 leaq foo@tlsgd(%rip), %rdi
3296 .word 0x6666; rex64; call __tls_get_addr@PLT
3297 or
3298 leaq foo@tlsgd(%rip), %rdi
3299 .byte 0x66; rex64
3300 call *__tls_get_addr@GOTPCREL(%rip)
3301 which may be converted to
3302 addr32 call __tls_get_addr
3303 into:
3304 movl %fs:0, %eax
3305 leaq foo@tpoff(%rax), %rax
3306 For largepic, change:
3307 leaq foo@tlsgd(%rip), %rdi
3308 movabsq $__tls_get_addr@pltoff, %rax
3309 addq %r15, %rax
3310 call *%rax
3311 into:
3312 movq %fs:0, %rax
3313 leaq foo@tpoff(%rax), %rax
3314 nopw 0x0(%rax,%rax,1) */
3315 int largepic = 0;
3316 if (ABI_64_P (output_bfd))
3317 {
3318 if (contents[roff + 5] == 0xb8)
3319 {
3320 memcpy (contents + roff - 3,
3321 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
3322 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
3323 largepic = 1;
3324 }
3325 else
3326 memcpy (contents + roff - 4,
3327 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3328 16);
3329 }
3330 else
3331 memcpy (contents + roff - 3,
3332 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3333 15);
3334 bfd_put_32 (output_bfd,
3335 elf_x86_64_tpoff (info, relocation),
3336 contents + roff + 8 + largepic);
3337 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
3338 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
3339 rel++;
3340 wrel++;
3341 continue;
3342 }
3343 else if (r_type == R_X86_64_GOTPC32_TLSDESC)
3344 {
3345 /* GDesc -> LE transition.
3346 It's originally something like:
3347 leaq x@tlsdesc(%rip), %rax
3348
3349 Change it to:
3350 movl $x@tpoff, %rax. */
3351
3352 unsigned int val, type;
3353
3354 type = bfd_get_8 (input_bfd, contents + roff - 3);
3355 val = bfd_get_8 (input_bfd, contents + roff - 1);
3356 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3357 contents + roff - 3);
3358 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3359 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3360 contents + roff - 1);
3361 bfd_put_32 (output_bfd,
3362 elf_x86_64_tpoff (info, relocation),
3363 contents + roff);
3364 continue;
3365 }
3366 else if (r_type == R_X86_64_TLSDESC_CALL)
3367 {
3368 /* GDesc -> LE transition.
3369 It's originally:
3370 call *(%rax)
3371 Turn it into:
3372 xchg %ax,%ax. */
3373 bfd_put_8 (output_bfd, 0x66, contents + roff);
3374 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3375 continue;
3376 }
3377 else if (r_type == R_X86_64_GOTTPOFF)
3378 {
3379 /* IE->LE transition:
3380 For 64bit, originally it can be one of:
3381 movq foo@gottpoff(%rip), %reg
3382 addq foo@gottpoff(%rip), %reg
3383 We change it into:
3384 movq $foo, %reg
3385 leaq foo(%reg), %reg
3386 addq $foo, %reg.
3387 For 32bit, originally it can be one of:
3388 movq foo@gottpoff(%rip), %reg
3389 addl foo@gottpoff(%rip), %reg
3390 We change it into:
3391 movq $foo, %reg
3392 leal foo(%reg), %reg
3393 addl $foo, %reg. */
3394
3395 unsigned int val, type, reg;
3396
3397 if (roff >= 3)
3398 val = bfd_get_8 (input_bfd, contents + roff - 3);
3399 else
3400 val = 0;
3401 type = bfd_get_8 (input_bfd, contents + roff - 2);
3402 reg = bfd_get_8 (input_bfd, contents + roff - 1);
3403 reg >>= 3;
3404 if (type == 0x8b)
3405 {
3406 /* movq */
3407 if (val == 0x4c)
3408 bfd_put_8 (output_bfd, 0x49,
3409 contents + roff - 3);
3410 else if (!ABI_64_P (output_bfd) && val == 0x44)
3411 bfd_put_8 (output_bfd, 0x41,
3412 contents + roff - 3);
3413 bfd_put_8 (output_bfd, 0xc7,
3414 contents + roff - 2);
3415 bfd_put_8 (output_bfd, 0xc0 | reg,
3416 contents + roff - 1);
3417 }
3418 else if (reg == 4)
3419 {
3420 /* addq/addl -> addq/addl - addressing with %rsp/%r12
3421 is special */
3422 if (val == 0x4c)
3423 bfd_put_8 (output_bfd, 0x49,
3424 contents + roff - 3);
3425 else if (!ABI_64_P (output_bfd) && val == 0x44)
3426 bfd_put_8 (output_bfd, 0x41,
3427 contents + roff - 3);
3428 bfd_put_8 (output_bfd, 0x81,
3429 contents + roff - 2);
3430 bfd_put_8 (output_bfd, 0xc0 | reg,
3431 contents + roff - 1);
3432 }
3433 else
3434 {
3435 /* addq/addl -> leaq/leal */
3436 if (val == 0x4c)
3437 bfd_put_8 (output_bfd, 0x4d,
3438 contents + roff - 3);
3439 else if (!ABI_64_P (output_bfd) && val == 0x44)
3440 bfd_put_8 (output_bfd, 0x45,
3441 contents + roff - 3);
3442 bfd_put_8 (output_bfd, 0x8d,
3443 contents + roff - 2);
3444 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
3445 contents + roff - 1);
3446 }
3447 bfd_put_32 (output_bfd,
3448 elf_x86_64_tpoff (info, relocation),
3449 contents + roff);
3450 continue;
3451 }
3452 else
3453 BFD_ASSERT (FALSE);
3454 }
3455
3456 if (htab->elf.sgot == NULL)
3457 abort ();
3458
3459 if (h != NULL)
3460 {
3461 off = h->got.offset;
3462 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3463 }
3464 else
3465 {
3466 if (local_got_offsets == NULL)
3467 abort ();
3468
3469 off = local_got_offsets[r_symndx];
3470 offplt = local_tlsdesc_gotents[r_symndx];
3471 }
3472
3473 if ((off & 1) != 0)
3474 off &= ~1;
3475 else
3476 {
3477 Elf_Internal_Rela outrel;
3478 int dr_type, indx;
3479 asection *sreloc;
3480
3481 if (htab->elf.srelgot == NULL)
3482 abort ();
3483
3484 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3485
3486 if (GOT_TLS_GDESC_P (tls_type))
3487 {
3488 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
3489 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
3490 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
3491 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3492 + htab->elf.sgotplt->output_offset
3493 + offplt
3494 + htab->sgotplt_jump_table_size);
3495 sreloc = htab->elf.srelplt;
3496 if (indx == 0)
3497 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info);
3498 else
3499 outrel.r_addend = 0;
3500 elf_append_rela (output_bfd, sreloc, &outrel);
3501 }
3502
3503 sreloc = htab->elf.srelgot;
3504
3505 outrel.r_offset = (htab->elf.sgot->output_section->vma
3506 + htab->elf.sgot->output_offset + off);
3507
3508 if (GOT_TLS_GD_P (tls_type))
3509 dr_type = R_X86_64_DTPMOD64;
3510 else if (GOT_TLS_GDESC_P (tls_type))
3511 goto dr_done;
3512 else
3513 dr_type = R_X86_64_TPOFF64;
3514
3515 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
3516 outrel.r_addend = 0;
3517 if ((dr_type == R_X86_64_TPOFF64
3518 || dr_type == R_X86_64_TLSDESC) && indx == 0)
3519 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info);
3520 outrel.r_info = htab->r_info (indx, dr_type);
3521
3522 elf_append_rela (output_bfd, sreloc, &outrel);
3523
3524 if (GOT_TLS_GD_P (tls_type))
3525 {
3526 if (indx == 0)
3527 {
3528 BFD_ASSERT (! unresolved_reloc);
3529 bfd_put_64 (output_bfd,
3530 relocation - _bfd_x86_elf_dtpoff_base (info),
3531 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3532 }
3533 else
3534 {
3535 bfd_put_64 (output_bfd, 0,
3536 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3537 outrel.r_info = htab->r_info (indx,
3538 R_X86_64_DTPOFF64);
3539 outrel.r_offset += GOT_ENTRY_SIZE;
3540 elf_append_rela (output_bfd, sreloc,
3541 &outrel);
3542 }
3543 }
3544
3545 dr_done:
3546 if (h != NULL)
3547 h->got.offset |= 1;
3548 else
3549 local_got_offsets[r_symndx] |= 1;
3550 }
3551
3552 if (off >= (bfd_vma) -2
3553 && ! GOT_TLS_GDESC_P (tls_type))
3554 abort ();
3555 if (r_type_tls == r_type)
3556 {
3557 if (r_type == R_X86_64_GOTPC32_TLSDESC
3558 || r_type == R_X86_64_TLSDESC_CALL)
3559 relocation = htab->elf.sgotplt->output_section->vma
3560 + htab->elf.sgotplt->output_offset
3561 + offplt + htab->sgotplt_jump_table_size;
3562 else
3563 relocation = htab->elf.sgot->output_section->vma
3564 + htab->elf.sgot->output_offset + off;
3565 unresolved_reloc = FALSE;
3566 }
3567 else
3568 {
3569 bfd_vma roff = rel->r_offset;
3570
3571 if (r_type == R_X86_64_TLSGD)
3572 {
3573 /* GD->IE transition. For 64bit, change
3574 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3575 .word 0x6666; rex64; call __tls_get_addr@PLT
3576 or
3577 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3578 .byte 0x66; rex64
3579 call *__tls_get_addr@GOTPCREL(%rip
3580 which may be converted to
3581 addr32 call __tls_get_addr
3582 into:
3583 movq %fs:0, %rax
3584 addq foo@gottpoff(%rip), %rax
3585 For 32bit, change
3586 leaq foo@tlsgd(%rip), %rdi
3587 .word 0x6666; rex64; call __tls_get_addr@PLT
3588 or
3589 leaq foo@tlsgd(%rip), %rdi
3590 .byte 0x66; rex64;
3591 call *__tls_get_addr@GOTPCREL(%rip)
3592 which may be converted to
3593 addr32 call __tls_get_addr
3594 into:
3595 movl %fs:0, %eax
3596 addq foo@gottpoff(%rip), %rax
3597 For largepic, change:
3598 leaq foo@tlsgd(%rip), %rdi
3599 movabsq $__tls_get_addr@pltoff, %rax
3600 addq %r15, %rax
3601 call *%rax
3602 into:
3603 movq %fs:0, %rax
3604 addq foo@gottpoff(%rax), %rax
3605 nopw 0x0(%rax,%rax,1) */
3606 int largepic = 0;
3607 if (ABI_64_P (output_bfd))
3608 {
3609 if (contents[roff + 5] == 0xb8)
3610 {
3611 memcpy (contents + roff - 3,
3612 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
3613 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
3614 largepic = 1;
3615 }
3616 else
3617 memcpy (contents + roff - 4,
3618 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3619 16);
3620 }
3621 else
3622 memcpy (contents + roff - 3,
3623 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3624 15);
3625
3626 relocation = (htab->elf.sgot->output_section->vma
3627 + htab->elf.sgot->output_offset + off
3628 - roff
3629 - largepic
3630 - input_section->output_section->vma
3631 - input_section->output_offset
3632 - 12);
3633 bfd_put_32 (output_bfd, relocation,
3634 contents + roff + 8 + largepic);
3635 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
3636 rel++;
3637 wrel++;
3638 continue;
3639 }
3640 else if (r_type == R_X86_64_GOTPC32_TLSDESC)
3641 {
3642 /* GDesc -> IE transition.
3643 It's originally something like:
3644 leaq x@tlsdesc(%rip), %rax
3645
3646 Change it to:
3647 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
3648
3649 /* Now modify the instruction as appropriate. To
3650 turn a leaq into a movq in the form we use it, it
3651 suffices to change the second byte from 0x8d to
3652 0x8b. */
3653 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3654
3655 bfd_put_32 (output_bfd,
3656 htab->elf.sgot->output_section->vma
3657 + htab->elf.sgot->output_offset + off
3658 - rel->r_offset
3659 - input_section->output_section->vma
3660 - input_section->output_offset
3661 - 4,
3662 contents + roff);
3663 continue;
3664 }
3665 else if (r_type == R_X86_64_TLSDESC_CALL)
3666 {
3667 /* GDesc -> IE transition.
3668 It's originally:
3669 call *(%rax)
3670
3671 Change it to:
3672 xchg %ax, %ax. */
3673
3674 bfd_put_8 (output_bfd, 0x66, contents + roff);
3675 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3676 continue;
3677 }
3678 else
3679 BFD_ASSERT (FALSE);
3680 }
3681 break;
3682
3683 case R_X86_64_TLSLD:
3684 if (! elf_x86_64_tls_transition (info, input_bfd,
3685 input_section, contents,
3686 symtab_hdr, sym_hashes,
3687 &r_type, GOT_UNKNOWN, rel,
3688 relend, h, r_symndx, TRUE))
3689 return FALSE;
3690
3691 if (r_type != R_X86_64_TLSLD)
3692 {
3693 /* LD->LE transition:
3694 leaq foo@tlsld(%rip), %rdi
3695 call __tls_get_addr@PLT
3696 For 64bit, we change it into:
3697 .word 0x6666; .byte 0x66; movq %fs:0, %rax
3698 For 32bit, we change it into:
3699 nopl 0x0(%rax); movl %fs:0, %eax
3700 Or
3701 leaq foo@tlsld(%rip), %rdi;
3702 call *__tls_get_addr@GOTPCREL(%rip)
3703 which may be converted to
3704 addr32 call __tls_get_addr
3705 For 64bit, we change it into:
3706 .word 0x6666; .word 0x6666; movq %fs:0, %rax
3707 For 32bit, we change it into:
3708 nopw 0x0(%rax); movl %fs:0, %eax
3709 For largepic, change:
3710 leaq foo@tlsgd(%rip), %rdi
3711 movabsq $__tls_get_addr@pltoff, %rax
3712 addq %rbx, %rax
3713 call *%rax
3714 into
3715 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
3716 movq %fs:0, %eax */
3717
3718 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
3719 if (ABI_64_P (output_bfd))
3720 {
3721 if (contents[rel->r_offset + 5] == 0xb8)
3722 memcpy (contents + rel->r_offset - 3,
3723 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
3724 "\x64\x48\x8b\x04\x25\0\0\0", 22);
3725 else if (contents[rel->r_offset + 4] == 0xff
3726 || contents[rel->r_offset + 4] == 0x67)
3727 memcpy (contents + rel->r_offset - 3,
3728 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
3729 13);
3730 else
3731 memcpy (contents + rel->r_offset - 3,
3732 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3733 }
3734 else
3735 {
3736 if (contents[rel->r_offset + 4] == 0xff)
3737 memcpy (contents + rel->r_offset - 3,
3738 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
3739 13);
3740 else
3741 memcpy (contents + rel->r_offset - 3,
3742 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
3743 }
3744 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
3745 and R_X86_64_PLTOFF64. */
3746 rel++;
3747 wrel++;
3748 continue;
3749 }
3750
3751 if (htab->elf.sgot == NULL)
3752 abort ();
3753
3754 off = htab->tls_ld_or_ldm_got.offset;
3755 if (off & 1)
3756 off &= ~1;
3757 else
3758 {
3759 Elf_Internal_Rela outrel;
3760
3761 if (htab->elf.srelgot == NULL)
3762 abort ();
3763
3764 outrel.r_offset = (htab->elf.sgot->output_section->vma
3765 + htab->elf.sgot->output_offset + off);
3766
3767 bfd_put_64 (output_bfd, 0,
3768 htab->elf.sgot->contents + off);
3769 bfd_put_64 (output_bfd, 0,
3770 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3771 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
3772 outrel.r_addend = 0;
3773 elf_append_rela (output_bfd, htab->elf.srelgot,
3774 &outrel);
3775 htab->tls_ld_or_ldm_got.offset |= 1;
3776 }
3777 relocation = htab->elf.sgot->output_section->vma
3778 + htab->elf.sgot->output_offset + off;
3779 unresolved_reloc = FALSE;
3780 break;
3781
3782 case R_X86_64_DTPOFF32:
3783 if (!bfd_link_executable (info)
3784 || (input_section->flags & SEC_CODE) == 0)
3785 relocation -= _bfd_x86_elf_dtpoff_base (info);
3786 else
3787 relocation = elf_x86_64_tpoff (info, relocation);
3788 break;
3789
3790 case R_X86_64_TPOFF32:
3791 case R_X86_64_TPOFF64:
3792 BFD_ASSERT (bfd_link_executable (info));
3793 relocation = elf_x86_64_tpoff (info, relocation);
3794 break;
3795
3796 case R_X86_64_DTPOFF64:
3797 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
3798 relocation -= _bfd_x86_elf_dtpoff_base (info);
3799 break;
3800
3801 default:
3802 break;
3803 }
3804
3805 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3806 because such sections are not SEC_ALLOC and thus ld.so will
3807 not process them. */
3808 if (unresolved_reloc
3809 && !((input_section->flags & SEC_DEBUGGING) != 0
3810 && h->def_dynamic)
3811 && _bfd_elf_section_offset (output_bfd, info, input_section,
3812 rel->r_offset) != (bfd_vma) -1)
3813 {
3814 switch (r_type)
3815 {
3816 case R_X86_64_32S:
3817 sec = h->root.u.def.section;
3818 if ((info->nocopyreloc
3819 || (eh->def_protected
3820 && elf_has_no_copy_on_protected (h->root.u.def.section->owner)))
3821 && !(h->root.u.def.section->flags & SEC_CODE))
3822 return elf_x86_64_need_pic (info, input_bfd, input_section,
3823 h, NULL, NULL, howto);
3824 /* Fall through. */
3825
3826 default:
3827 _bfd_error_handler
3828 /* xgettext:c-format */
3829 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
3830 input_bfd,
3831 input_section,
3832 rel->r_offset,
3833 howto->name,
3834 h->root.root.string);
3835 return FALSE;
3836 }
3837 }
3838
3839 do_relocation:
3840 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3841 contents, rel->r_offset,
3842 relocation, rel->r_addend);
3843
3844 check_relocation_error:
3845 if (r != bfd_reloc_ok)
3846 {
3847 const char *name;
3848
3849 if (h != NULL)
3850 name = h->root.root.string;
3851 else
3852 {
3853 name = bfd_elf_string_from_elf_section (input_bfd,
3854 symtab_hdr->sh_link,
3855 sym->st_name);
3856 if (name == NULL)
3857 return FALSE;
3858 if (*name == '\0')
3859 name = bfd_section_name (input_bfd, sec);
3860 }
3861
3862 if (r == bfd_reloc_overflow)
3863 {
3864 if (converted_reloc)
3865 {
3866 info->callbacks->einfo
3867 (_("%F%P: failed to convert GOTPCREL relocation; relink with --no-relax\n"));
3868 return FALSE;
3869 }
3870 (*info->callbacks->reloc_overflow)
3871 (info, (h ? &h->root : NULL), name, howto->name,
3872 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3873 }
3874 else
3875 {
3876 _bfd_error_handler
3877 /* xgettext:c-format */
3878 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
3879 input_bfd, input_section,
3880 rel->r_offset, name, (int) r);
3881 return FALSE;
3882 }
3883 }
3884
3885 if (wrel != rel)
3886 *wrel = *rel;
3887 }
3888
3889 if (wrel != rel)
3890 {
3891 Elf_Internal_Shdr *rel_hdr;
3892 size_t deleted = rel - wrel;
3893
3894 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3895 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3896 if (rel_hdr->sh_size == 0)
3897 {
3898 /* It is too late to remove an empty reloc section. Leave
3899 one NONE reloc.
3900 ??? What is wrong with an empty section??? */
3901 rel_hdr->sh_size = rel_hdr->sh_entsize;
3902 deleted -= 1;
3903 }
3904 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3905 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3906 input_section->reloc_count -= deleted;
3907 }
3908
3909 return TRUE;
3910 }
3911
3912 /* Finish up dynamic symbol handling. We set the contents of various
3913 dynamic sections here. */
3914
3915 static bfd_boolean
3916 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
3917 struct bfd_link_info *info,
3918 struct elf_link_hash_entry *h,
3919 Elf_Internal_Sym *sym)
3920 {
3921 struct elf_x86_link_hash_table *htab;
3922 bfd_boolean use_plt_second;
3923 struct elf_x86_link_hash_entry *eh;
3924 bfd_boolean local_undefweak;
3925
3926 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
3927 if (htab == NULL)
3928 return FALSE;
3929
3930 /* Use the second PLT section only if there is .plt section. */
3931 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3932
3933 eh = (struct elf_x86_link_hash_entry *) h;
3934 if (eh->no_finish_dynamic_symbol)
3935 abort ();
3936
3937 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3938 resolved undefined weak symbols in executable so that their
3939 references have value 0 at run-time. */
3940 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3941
3942 if (h->plt.offset != (bfd_vma) -1)
3943 {
3944 bfd_vma plt_index;
3945 bfd_vma got_offset, plt_offset;
3946 Elf_Internal_Rela rela;
3947 bfd_byte *loc;
3948 asection *plt, *gotplt, *relplt, *resolved_plt;
3949 const struct elf_backend_data *bed;
3950 bfd_vma plt_got_pcrel_offset;
3951
3952 /* When building a static executable, use .iplt, .igot.plt and
3953 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3954 if (htab->elf.splt != NULL)
3955 {
3956 plt = htab->elf.splt;
3957 gotplt = htab->elf.sgotplt;
3958 relplt = htab->elf.srelplt;
3959 }
3960 else
3961 {
3962 plt = htab->elf.iplt;
3963 gotplt = htab->elf.igotplt;
3964 relplt = htab->elf.irelplt;
3965 }
3966
3967 /* This symbol has an entry in the procedure linkage table. Set
3968 it up. */
3969 if ((h->dynindx == -1
3970 && !local_undefweak
3971 && !((h->forced_local || bfd_link_executable (info))
3972 && h->def_regular
3973 && h->type == STT_GNU_IFUNC))
3974 || plt == NULL
3975 || gotplt == NULL
3976 || relplt == NULL)
3977 abort ();
3978
3979 /* Get the index in the procedure linkage table which
3980 corresponds to this symbol. This is the index of this symbol
3981 in all the symbols for which we are making plt entries. The
3982 first entry in the procedure linkage table is reserved.
3983
3984 Get the offset into the .got table of the entry that
3985 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3986 bytes. The first three are reserved for the dynamic linker.
3987
3988 For static executables, we don't reserve anything. */
3989
3990 if (plt == htab->elf.splt)
3991 {
3992 got_offset = (h->plt.offset / htab->plt.plt_entry_size
3993 - htab->plt.has_plt0);
3994 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
3995 }
3996 else
3997 {
3998 got_offset = h->plt.offset / htab->plt.plt_entry_size;
3999 got_offset = got_offset * GOT_ENTRY_SIZE;
4000 }
4001
4002 /* Fill in the entry in the procedure linkage table. */
4003 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
4004 htab->plt.plt_entry_size);
4005 if (use_plt_second)
4006 {
4007 memcpy (htab->plt_second->contents + eh->plt_second.offset,
4008 htab->non_lazy_plt->plt_entry,
4009 htab->non_lazy_plt->plt_entry_size);
4010
4011 resolved_plt = htab->plt_second;
4012 plt_offset = eh->plt_second.offset;
4013 }
4014 else
4015 {
4016 resolved_plt = plt;
4017 plt_offset = h->plt.offset;
4018 }
4019
4020 /* Insert the relocation positions of the plt section. */
4021
4022 /* Put offset the PC-relative instruction referring to the GOT entry,
4023 subtracting the size of that instruction. */
4024 plt_got_pcrel_offset = (gotplt->output_section->vma
4025 + gotplt->output_offset
4026 + got_offset
4027 - resolved_plt->output_section->vma
4028 - resolved_plt->output_offset
4029 - plt_offset
4030 - htab->plt.plt_got_insn_size);
4031
4032 /* Check PC-relative offset overflow in PLT entry. */
4033 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
4034 /* xgettext:c-format */
4035 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
4036 output_bfd, h->root.root.string);
4037
4038 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
4039 (resolved_plt->contents + plt_offset
4040 + htab->plt.plt_got_offset));
4041
4042 /* Fill in the entry in the global offset table, initially this
4043 points to the second part of the PLT entry. Leave the entry
4044 as zero for undefined weak symbol in PIE. No PLT relocation
4045 against undefined weak symbol in PIE. */
4046 if (!local_undefweak)
4047 {
4048 if (htab->plt.has_plt0)
4049 bfd_put_64 (output_bfd, (plt->output_section->vma
4050 + plt->output_offset
4051 + h->plt.offset
4052 + htab->lazy_plt->plt_lazy_offset),
4053 gotplt->contents + got_offset);
4054
4055 /* Fill in the entry in the .rela.plt section. */
4056 rela.r_offset = (gotplt->output_section->vma
4057 + gotplt->output_offset
4058 + got_offset);
4059 if (PLT_LOCAL_IFUNC_P (info, h))
4060 {
4061 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
4062 h->root.root.string,
4063 h->root.u.def.section->owner);
4064
4065 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4066 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4067 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
4068 rela.r_addend = (h->root.u.def.value
4069 + h->root.u.def.section->output_section->vma
4070 + h->root.u.def.section->output_offset);
4071 /* R_X86_64_IRELATIVE comes last. */
4072 plt_index = htab->next_irelative_index--;
4073 }
4074 else
4075 {
4076 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
4077 rela.r_addend = 0;
4078 plt_index = htab->next_jump_slot_index++;
4079 }
4080
4081 /* Don't fill the second and third slots in PLT entry for
4082 static executables nor without PLT0. */
4083 if (plt == htab->elf.splt && htab->plt.has_plt0)
4084 {
4085 bfd_vma plt0_offset
4086 = h->plt.offset + htab->lazy_plt->plt_plt_insn_end;
4087
4088 /* Put relocation index. */
4089 bfd_put_32 (output_bfd, plt_index,
4090 (plt->contents + h->plt.offset
4091 + htab->lazy_plt->plt_reloc_offset));
4092
4093 /* Put offset for jmp .PLT0 and check for overflow. We don't
4094 check relocation index for overflow since branch displacement
4095 will overflow first. */
4096 if (plt0_offset > 0x80000000)
4097 /* xgettext:c-format */
4098 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
4099 output_bfd, h->root.root.string);
4100 bfd_put_32 (output_bfd, - plt0_offset,
4101 (plt->contents + h->plt.offset
4102 + htab->lazy_plt->plt_plt_offset));
4103 }
4104
4105 bed = get_elf_backend_data (output_bfd);
4106 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
4107 bed->s->swap_reloca_out (output_bfd, &rela, loc);
4108 }
4109 }
4110 else if (eh->plt_got.offset != (bfd_vma) -1)
4111 {
4112 bfd_vma got_offset, plt_offset;
4113 asection *plt, *got;
4114 bfd_boolean got_after_plt;
4115 int32_t got_pcrel_offset;
4116
4117 /* Set the entry in the GOT procedure linkage table. */
4118 plt = htab->plt_got;
4119 got = htab->elf.sgot;
4120 got_offset = h->got.offset;
4121
4122 if (got_offset == (bfd_vma) -1
4123 || (h->type == STT_GNU_IFUNC && h->def_regular)
4124 || plt == NULL
4125 || got == NULL)
4126 abort ();
4127
4128 /* Use the non-lazy PLT entry template for the GOT PLT since they
4129 are the identical. */
4130 /* Fill in the entry in the GOT procedure linkage table. */
4131 plt_offset = eh->plt_got.offset;
4132 memcpy (plt->contents + plt_offset,
4133 htab->non_lazy_plt->plt_entry,
4134 htab->non_lazy_plt->plt_entry_size);
4135
4136 /* Put offset the PC-relative instruction referring to the GOT
4137 entry, subtracting the size of that instruction. */
4138 got_pcrel_offset = (got->output_section->vma
4139 + got->output_offset
4140 + got_offset
4141 - plt->output_section->vma
4142 - plt->output_offset
4143 - plt_offset
4144 - htab->non_lazy_plt->plt_got_insn_size);
4145
4146 /* Check PC-relative offset overflow in GOT PLT entry. */
4147 got_after_plt = got->output_section->vma > plt->output_section->vma;
4148 if ((got_after_plt && got_pcrel_offset < 0)
4149 || (!got_after_plt && got_pcrel_offset > 0))
4150 /* xgettext:c-format */
4151 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
4152 output_bfd, h->root.root.string);
4153
4154 bfd_put_32 (output_bfd, got_pcrel_offset,
4155 (plt->contents + plt_offset
4156 + htab->non_lazy_plt->plt_got_offset));
4157 }
4158
4159 if (!local_undefweak
4160 && !h->def_regular
4161 && (h->plt.offset != (bfd_vma) -1
4162 || eh->plt_got.offset != (bfd_vma) -1))
4163 {
4164 /* Mark the symbol as undefined, rather than as defined in
4165 the .plt section. Leave the value if there were any
4166 relocations where pointer equality matters (this is a clue
4167 for the dynamic linker, to make function pointer
4168 comparisons work between an application and shared
4169 library), otherwise set it to zero. If a function is only
4170 called from a binary, there is no need to slow down
4171 shared libraries because of that. */
4172 sym->st_shndx = SHN_UNDEF;
4173 if (!h->pointer_equality_needed)
4174 sym->st_value = 0;
4175 }
4176
4177 /* Don't generate dynamic GOT relocation against undefined weak
4178 symbol in executable. */
4179 if (h->got.offset != (bfd_vma) -1
4180 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h)->tls_type)
4181 && elf_x86_hash_entry (h)->tls_type != GOT_TLS_IE
4182 && !local_undefweak)
4183 {
4184 Elf_Internal_Rela rela;
4185 asection *relgot = htab->elf.srelgot;
4186
4187 /* This symbol has an entry in the global offset table. Set it
4188 up. */
4189 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4190 abort ();
4191
4192 rela.r_offset = (htab->elf.sgot->output_section->vma
4193 + htab->elf.sgot->output_offset
4194 + (h->got.offset &~ (bfd_vma) 1));
4195
4196 /* If this is a static link, or it is a -Bsymbolic link and the
4197 symbol is defined locally or was forced to be local because
4198 of a version file, we just want to emit a RELATIVE reloc.
4199 The entry in the global offset table will already have been
4200 initialized in the relocate_section function. */
4201 if (h->def_regular
4202 && h->type == STT_GNU_IFUNC)
4203 {
4204 if (h->plt.offset == (bfd_vma) -1)
4205 {
4206 /* STT_GNU_IFUNC is referenced without PLT. */
4207 if (htab->elf.splt == NULL)
4208 {
4209 /* use .rel[a].iplt section to store .got relocations
4210 in static executable. */
4211 relgot = htab->elf.irelplt;
4212 }
4213 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
4214 {
4215 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
4216 h->root.root.string,
4217 h->root.u.def.section->owner);
4218
4219 rela.r_info = htab->r_info (0,
4220 R_X86_64_IRELATIVE);
4221 rela.r_addend = (h->root.u.def.value
4222 + h->root.u.def.section->output_section->vma
4223 + h->root.u.def.section->output_offset);
4224 }
4225 else
4226 goto do_glob_dat;
4227 }
4228 else if (bfd_link_pic (info))
4229 {
4230 /* Generate R_X86_64_GLOB_DAT. */
4231 goto do_glob_dat;
4232 }
4233 else
4234 {
4235 asection *plt;
4236 bfd_vma plt_offset;
4237
4238 if (!h->pointer_equality_needed)
4239 abort ();
4240
4241 /* For non-shared object, we can't use .got.plt, which
4242 contains the real function addres if we need pointer
4243 equality. We load the GOT entry with the PLT entry. */
4244 if (htab->plt_second != NULL)
4245 {
4246 plt = htab->plt_second;
4247 plt_offset = eh->plt_second.offset;
4248 }
4249 else
4250 {
4251 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4252 plt_offset = h->plt.offset;
4253 }
4254 bfd_put_64 (output_bfd, (plt->output_section->vma
4255 + plt->output_offset
4256 + plt_offset),
4257 htab->elf.sgot->contents + h->got.offset);
4258 return TRUE;
4259 }
4260 }
4261 else if (bfd_link_pic (info)
4262 && SYMBOL_REFERENCES_LOCAL_P (info, h))
4263 {
4264 if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
4265 return FALSE;
4266 BFD_ASSERT((h->got.offset & 1) != 0);
4267 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4268 rela.r_addend = (h->root.u.def.value
4269 + h->root.u.def.section->output_section->vma
4270 + h->root.u.def.section->output_offset);
4271 }
4272 else
4273 {
4274 BFD_ASSERT((h->got.offset & 1) == 0);
4275 do_glob_dat:
4276 bfd_put_64 (output_bfd, (bfd_vma) 0,
4277 htab->elf.sgot->contents + h->got.offset);
4278 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
4279 rela.r_addend = 0;
4280 }
4281
4282 elf_append_rela (output_bfd, relgot, &rela);
4283 }
4284
4285 if (h->needs_copy)
4286 {
4287 Elf_Internal_Rela rela;
4288 asection *s;
4289
4290 /* This symbol needs a copy reloc. Set it up. */
4291
4292 if (h->dynindx == -1
4293 || (h->root.type != bfd_link_hash_defined
4294 && h->root.type != bfd_link_hash_defweak)
4295 || htab->elf.srelbss == NULL
4296 || htab->elf.sreldynrelro == NULL)
4297 abort ();
4298
4299 rela.r_offset = (h->root.u.def.value
4300 + h->root.u.def.section->output_section->vma
4301 + h->root.u.def.section->output_offset);
4302 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
4303 rela.r_addend = 0;
4304 if (h->root.u.def.section == htab->elf.sdynrelro)
4305 s = htab->elf.sreldynrelro;
4306 else
4307 s = htab->elf.srelbss;
4308 elf_append_rela (output_bfd, s, &rela);
4309 }
4310
4311 return TRUE;
4312 }
4313
4314 /* Finish up local dynamic symbol handling. We set the contents of
4315 various dynamic sections here. */
4316
4317 static bfd_boolean
4318 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
4319 {
4320 struct elf_link_hash_entry *h
4321 = (struct elf_link_hash_entry *) *slot;
4322 struct bfd_link_info *info
4323 = (struct bfd_link_info *) inf;
4324
4325 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
4326 info, h, NULL);
4327 }
4328
4329 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4330 here since undefined weak symbol may not be dynamic and may not be
4331 called for elf_x86_64_finish_dynamic_symbol. */
4332
4333 static bfd_boolean
4334 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
4335 void *inf)
4336 {
4337 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
4338 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4339
4340 if (h->root.type != bfd_link_hash_undefweak
4341 || h->dynindx != -1)
4342 return TRUE;
4343
4344 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
4345 info, h, NULL);
4346 }
4347
4348 /* Used to decide how to sort relocs in an optimal manner for the
4349 dynamic linker, before writing them out. */
4350
4351 static enum elf_reloc_type_class
4352 elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
4353 const asection *rel_sec ATTRIBUTE_UNUSED,
4354 const Elf_Internal_Rela *rela)
4355 {
4356 bfd *abfd = info->output_bfd;
4357 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
4358 struct elf_x86_link_hash_table *htab
4359 = elf_x86_hash_table (info, X86_64_ELF_DATA);
4360
4361 if (htab->elf.dynsym != NULL
4362 && htab->elf.dynsym->contents != NULL)
4363 {
4364 /* Check relocation against STT_GNU_IFUNC symbol if there are
4365 dynamic symbols. */
4366 unsigned long r_symndx = htab->r_sym (rela->r_info);
4367 if (r_symndx != STN_UNDEF)
4368 {
4369 Elf_Internal_Sym sym;
4370 if (!bed->s->swap_symbol_in (abfd,
4371 (htab->elf.dynsym->contents
4372 + r_symndx * bed->s->sizeof_sym),
4373 0, &sym))
4374 abort ();
4375
4376 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
4377 return reloc_class_ifunc;
4378 }
4379 }
4380
4381 switch ((int) ELF32_R_TYPE (rela->r_info))
4382 {
4383 case R_X86_64_IRELATIVE:
4384 return reloc_class_ifunc;
4385 case R_X86_64_RELATIVE:
4386 case R_X86_64_RELATIVE64:
4387 return reloc_class_relative;
4388 case R_X86_64_JUMP_SLOT:
4389 return reloc_class_plt;
4390 case R_X86_64_COPY:
4391 return reloc_class_copy;
4392 default:
4393 return reloc_class_normal;
4394 }
4395 }
4396
4397 /* Finish up the dynamic sections. */
4398
4399 static bfd_boolean
4400 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
4401 struct bfd_link_info *info)
4402 {
4403 struct elf_x86_link_hash_table *htab;
4404 bfd *dynobj;
4405 asection *sdyn;
4406
4407 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
4408 if (htab == NULL)
4409 return FALSE;
4410
4411 dynobj = htab->elf.dynobj;
4412 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4413
4414 if (htab->elf.dynamic_sections_created)
4415 {
4416 bfd_byte *dyncon, *dynconend;
4417 const struct elf_backend_data *bed;
4418 bfd_size_type sizeof_dyn;
4419
4420 if (sdyn == NULL || htab->elf.sgot == NULL)
4421 abort ();
4422
4423 bed = get_elf_backend_data (dynobj);
4424 sizeof_dyn = bed->s->sizeof_dyn;
4425 dyncon = sdyn->contents;
4426 dynconend = sdyn->contents + sdyn->size;
4427 for (; dyncon < dynconend; dyncon += sizeof_dyn)
4428 {
4429 Elf_Internal_Dyn dyn;
4430 asection *s;
4431
4432 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
4433
4434 switch (dyn.d_tag)
4435 {
4436 default:
4437 continue;
4438
4439 case DT_PLTGOT:
4440 s = htab->elf.sgotplt;
4441 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4442 break;
4443
4444 case DT_JMPREL:
4445 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4446 break;
4447
4448 case DT_PLTRELSZ:
4449 s = htab->elf.srelplt->output_section;
4450 dyn.d_un.d_val = s->size;
4451 break;
4452
4453 case DT_TLSDESC_PLT:
4454 s = htab->elf.splt;
4455 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4456 + htab->tlsdesc_plt;
4457 break;
4458
4459 case DT_TLSDESC_GOT:
4460 s = htab->elf.sgot;
4461 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4462 + htab->tlsdesc_got;
4463 break;
4464 }
4465
4466 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
4467 }
4468
4469 if (htab->elf.splt && htab->elf.splt->size > 0)
4470 {
4471 elf_section_data (htab->elf.splt->output_section)
4472 ->this_hdr.sh_entsize = htab->plt.plt_entry_size;
4473
4474 if (htab->plt.has_plt0)
4475 {
4476 /* Fill in the special first entry in the procedure linkage
4477 table. */
4478 memcpy (htab->elf.splt->contents,
4479 htab->lazy_plt->plt0_entry,
4480 htab->lazy_plt->plt0_entry_size);
4481 /* Add offset for pushq GOT+8(%rip), since the instruction
4482 uses 6 bytes subtract this value. */
4483 bfd_put_32 (output_bfd,
4484 (htab->elf.sgotplt->output_section->vma
4485 + htab->elf.sgotplt->output_offset
4486 + 8
4487 - htab->elf.splt->output_section->vma
4488 - htab->elf.splt->output_offset
4489 - 6),
4490 (htab->elf.splt->contents
4491 + htab->lazy_plt->plt0_got1_offset));
4492 /* Add offset for the PC-relative instruction accessing
4493 GOT+16, subtracting the offset to the end of that
4494 instruction. */
4495 bfd_put_32 (output_bfd,
4496 (htab->elf.sgotplt->output_section->vma
4497 + htab->elf.sgotplt->output_offset
4498 + 16
4499 - htab->elf.splt->output_section->vma
4500 - htab->elf.splt->output_offset
4501 - htab->lazy_plt->plt0_got2_insn_end),
4502 (htab->elf.splt->contents
4503 + htab->lazy_plt->plt0_got2_offset));
4504
4505 if (htab->tlsdesc_plt)
4506 {
4507 bfd_put_64 (output_bfd, (bfd_vma) 0,
4508 htab->elf.sgot->contents + htab->tlsdesc_got);
4509
4510 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4511 htab->lazy_plt->plt0_entry,
4512 htab->lazy_plt->plt0_entry_size);
4513
4514 /* Add offset for pushq GOT+8(%rip), since the
4515 instruction uses 6 bytes subtract this value. */
4516 bfd_put_32 (output_bfd,
4517 (htab->elf.sgotplt->output_section->vma
4518 + htab->elf.sgotplt->output_offset
4519 + 8
4520 - htab->elf.splt->output_section->vma
4521 - htab->elf.splt->output_offset
4522 - htab->tlsdesc_plt
4523 - 6),
4524 (htab->elf.splt->contents
4525 + htab->tlsdesc_plt
4526 + htab->lazy_plt->plt0_got1_offset));
4527 /* Add offset for the PC-relative instruction accessing
4528 GOT+TDG, where TDG stands for htab->tlsdesc_got,
4529 subtracting the offset to the end of that
4530 instruction. */
4531 bfd_put_32 (output_bfd,
4532 (htab->elf.sgot->output_section->vma
4533 + htab->elf.sgot->output_offset
4534 + htab->tlsdesc_got
4535 - htab->elf.splt->output_section->vma
4536 - htab->elf.splt->output_offset
4537 - htab->tlsdesc_plt
4538 - htab->lazy_plt->plt0_got2_insn_end),
4539 (htab->elf.splt->contents
4540 + htab->tlsdesc_plt
4541 + htab->lazy_plt->plt0_got2_offset));
4542 }
4543 }
4544 }
4545
4546 if (htab->plt_got != NULL && htab->plt_got->size > 0)
4547 elf_section_data (htab->plt_got->output_section)
4548 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
4549
4550 if (htab->plt_second != NULL && htab->plt_second->size > 0)
4551 elf_section_data (htab->plt_second->output_section)
4552 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
4553 }
4554
4555 /* GOT is always created in setup_gnu_properties. But it may not be
4556 needed. */
4557 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
4558 {
4559 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4560 {
4561 _bfd_error_handler
4562 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4563 return FALSE;
4564 }
4565
4566 /* Set the first entry in the global offset table to the address of
4567 the dynamic section. */
4568 if (sdyn == NULL)
4569 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4570 else
4571 bfd_put_64 (output_bfd,
4572 sdyn->output_section->vma + sdyn->output_offset,
4573 htab->elf.sgotplt->contents);
4574 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4575 bfd_put_64 (output_bfd, (bfd_vma) 0,
4576 htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4577 bfd_put_64 (output_bfd, (bfd_vma) 0,
4578 htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4579
4580 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize
4581 = GOT_ENTRY_SIZE;
4582 }
4583
4584 /* Adjust .eh_frame for .plt section. */
4585 if (htab->plt_eh_frame != NULL
4586 && htab->plt_eh_frame->contents != NULL)
4587 {
4588 if (htab->elf.splt != NULL
4589 && htab->elf.splt->size != 0
4590 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4591 && htab->elf.splt->output_section != NULL
4592 && htab->plt_eh_frame->output_section != NULL)
4593 {
4594 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4595 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4596 + htab->plt_eh_frame->output_offset
4597 + PLT_FDE_START_OFFSET;
4598 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4599 htab->plt_eh_frame->contents
4600 + PLT_FDE_START_OFFSET);
4601 }
4602 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
4603 {
4604 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4605 htab->plt_eh_frame,
4606 htab->plt_eh_frame->contents))
4607 return FALSE;
4608 }
4609 }
4610
4611 /* Adjust .eh_frame for .plt.got section. */
4612 if (htab->plt_got_eh_frame != NULL
4613 && htab->plt_got_eh_frame->contents != NULL)
4614 {
4615 if (htab->plt_got != NULL
4616 && htab->plt_got->size != 0
4617 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
4618 && htab->plt_got->output_section != NULL
4619 && htab->plt_got_eh_frame->output_section != NULL)
4620 {
4621 bfd_vma plt_start = htab->plt_got->output_section->vma;
4622 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
4623 + htab->plt_got_eh_frame->output_offset
4624 + PLT_FDE_START_OFFSET;
4625 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4626 htab->plt_got_eh_frame->contents
4627 + PLT_FDE_START_OFFSET);
4628 }
4629 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
4630 {
4631 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4632 htab->plt_got_eh_frame,
4633 htab->plt_got_eh_frame->contents))
4634 return FALSE;
4635 }
4636 }
4637
4638 /* Adjust .eh_frame for the second PLT section. */
4639 if (htab->plt_second_eh_frame != NULL
4640 && htab->plt_second_eh_frame->contents != NULL)
4641 {
4642 if (htab->plt_second != NULL
4643 && htab->plt_second->size != 0
4644 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
4645 && htab->plt_second->output_section != NULL
4646 && htab->plt_second_eh_frame->output_section != NULL)
4647 {
4648 bfd_vma plt_start = htab->plt_second->output_section->vma;
4649 bfd_vma eh_frame_start
4650 = (htab->plt_second_eh_frame->output_section->vma
4651 + htab->plt_second_eh_frame->output_offset
4652 + PLT_FDE_START_OFFSET);
4653 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4654 htab->plt_second_eh_frame->contents
4655 + PLT_FDE_START_OFFSET);
4656 }
4657 if (htab->plt_second_eh_frame->sec_info_type
4658 == SEC_INFO_TYPE_EH_FRAME)
4659 {
4660 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4661 htab->plt_second_eh_frame,
4662 htab->plt_second_eh_frame->contents))
4663 return FALSE;
4664 }
4665 }
4666
4667 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4668 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
4669 = GOT_ENTRY_SIZE;
4670
4671 /* Fill PLT entries for undefined weak symbols in PIE. */
4672 if (bfd_link_pie (info))
4673 bfd_hash_traverse (&info->hash->table,
4674 elf_x86_64_pie_finish_undefweak_symbol,
4675 info);
4676
4677 return TRUE;
4678 }
4679
4680 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4681 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4682 It has to be done before elf_link_sort_relocs is called so that
4683 dynamic relocations are properly sorted. */
4684
4685 static bfd_boolean
4686 elf_x86_64_output_arch_local_syms
4687 (bfd *output_bfd ATTRIBUTE_UNUSED,
4688 struct bfd_link_info *info,
4689 void *flaginfo ATTRIBUTE_UNUSED,
4690 int (*func) (void *, const char *,
4691 Elf_Internal_Sym *,
4692 asection *,
4693 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4694 {
4695 struct elf_x86_link_hash_table *htab
4696 = elf_x86_hash_table (info, X86_64_ELF_DATA);
4697 if (htab == NULL)
4698 return FALSE;
4699
4700 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4701 htab_traverse (htab->loc_hash_table,
4702 elf_x86_64_finish_local_dynamic_symbol,
4703 info);
4704
4705 return TRUE;
4706 }
4707
4708 /* Forward declaration. */
4709 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt;
4710
4711 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4712 dynamic relocations. */
4713
4714 static long
4715 elf_x86_64_get_synthetic_symtab (bfd *abfd,
4716 long symcount ATTRIBUTE_UNUSED,
4717 asymbol **syms ATTRIBUTE_UNUSED,
4718 long dynsymcount,
4719 asymbol **dynsyms,
4720 asymbol **ret)
4721 {
4722 long count, i, n;
4723 int j;
4724 bfd_byte *plt_contents;
4725 long relsize;
4726 const struct elf_x86_lazy_plt_layout *lazy_plt;
4727 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4728 const struct elf_x86_lazy_plt_layout *lazy_bnd_plt;
4729 const struct elf_x86_non_lazy_plt_layout *non_lazy_bnd_plt;
4730 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4731 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4732 asection *plt;
4733 enum elf_x86_plt_type plt_type;
4734 struct elf_x86_plt plts[] =
4735 {
4736 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4737 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4738 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4739 { ".plt.bnd", NULL, NULL, plt_second, 0, 0, 0, 0 },
4740 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4741 };
4742
4743 *ret = NULL;
4744
4745 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4746 return 0;
4747
4748 if (dynsymcount <= 0)
4749 return 0;
4750
4751 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4752 if (relsize <= 0)
4753 return -1;
4754
4755 if (get_elf_x86_64_backend_data (abfd)->os == is_normal)
4756 {
4757 lazy_plt = &elf_x86_64_lazy_plt;
4758 non_lazy_plt = &elf_x86_64_non_lazy_plt;
4759 lazy_bnd_plt = &elf_x86_64_lazy_bnd_plt;
4760 non_lazy_bnd_plt = &elf_x86_64_non_lazy_bnd_plt;
4761 if (ABI_64_P (abfd))
4762 {
4763 lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt;
4764 non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt;
4765 }
4766 else
4767 {
4768 lazy_ibt_plt = &elf_x32_lazy_ibt_plt;
4769 non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt;
4770 }
4771 }
4772 else
4773 {
4774 lazy_plt = &elf_x86_64_nacl_plt;
4775 non_lazy_plt = NULL;
4776 lazy_bnd_plt = NULL;
4777 non_lazy_bnd_plt = NULL;
4778 lazy_ibt_plt = NULL;
4779 non_lazy_ibt_plt = NULL;
4780 }
4781
4782 count = 0;
4783 for (j = 0; plts[j].name != NULL; j++)
4784 {
4785 plt = bfd_get_section_by_name (abfd, plts[j].name);
4786 if (plt == NULL || plt->size == 0)
4787 continue;
4788
4789 /* Get the PLT section contents. */
4790 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4791 if (plt_contents == NULL)
4792 break;
4793 if (!bfd_get_section_contents (abfd, (asection *) plt,
4794 plt_contents, 0, plt->size))
4795 {
4796 free (plt_contents);
4797 break;
4798 }
4799
4800 /* Check what kind of PLT it is. */
4801 plt_type = plt_unknown;
4802 if (plts[j].type == plt_unknown
4803 && (plt->size >= (lazy_plt->plt_entry_size
4804 + lazy_plt->plt_entry_size)))
4805 {
4806 /* Match lazy PLT first. Need to check the first two
4807 instructions. */
4808 if ((memcmp (plt_contents, lazy_plt->plt0_entry,
4809 lazy_plt->plt0_got1_offset) == 0)
4810 && (memcmp (plt_contents + 6, lazy_plt->plt0_entry + 6,
4811 2) == 0))
4812 plt_type = plt_lazy;
4813 else if (lazy_bnd_plt != NULL
4814 && (memcmp (plt_contents, lazy_bnd_plt->plt0_entry,
4815 lazy_bnd_plt->plt0_got1_offset) == 0)
4816 && (memcmp (plt_contents + 6,
4817 lazy_bnd_plt->plt0_entry + 6, 3) == 0))
4818 {
4819 plt_type = plt_lazy | plt_second;
4820 /* The fist entry in the lazy IBT PLT is the same as the
4821 lazy BND PLT. */
4822 if ((memcmp (plt_contents + lazy_ibt_plt->plt_entry_size,
4823 lazy_ibt_plt->plt_entry,
4824 lazy_ibt_plt->plt_got_offset) == 0))
4825 lazy_plt = lazy_ibt_plt;
4826 else
4827 lazy_plt = lazy_bnd_plt;
4828 }
4829 }
4830
4831 if (non_lazy_plt != NULL
4832 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4833 && plt->size >= non_lazy_plt->plt_entry_size)
4834 {
4835 /* Match non-lazy PLT. */
4836 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4837 non_lazy_plt->plt_got_offset) == 0)
4838 plt_type = plt_non_lazy;
4839 }
4840
4841 if (plt_type == plt_unknown || plt_type == plt_second)
4842 {
4843 if (non_lazy_bnd_plt != NULL
4844 && plt->size >= non_lazy_bnd_plt->plt_entry_size
4845 && (memcmp (plt_contents, non_lazy_bnd_plt->plt_entry,
4846 non_lazy_bnd_plt->plt_got_offset) == 0))
4847 {
4848 /* Match BND PLT. */
4849 plt_type = plt_second;
4850 non_lazy_plt = non_lazy_bnd_plt;
4851 }
4852 else if (non_lazy_ibt_plt != NULL
4853 && plt->size >= non_lazy_ibt_plt->plt_entry_size
4854 && (memcmp (plt_contents,
4855 non_lazy_ibt_plt->plt_entry,
4856 non_lazy_ibt_plt->plt_got_offset) == 0))
4857 {
4858 /* Match IBT PLT. */
4859 plt_type = plt_second;
4860 non_lazy_plt = non_lazy_ibt_plt;
4861 }
4862 }
4863
4864 if (plt_type == plt_unknown)
4865 {
4866 free (plt_contents);
4867 continue;
4868 }
4869
4870 plts[j].sec = plt;
4871 plts[j].type = plt_type;
4872
4873 if ((plt_type & plt_lazy))
4874 {
4875 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4876 plts[j].plt_got_insn_size = lazy_plt->plt_got_insn_size;
4877 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4878 /* Skip PLT0 in lazy PLT. */
4879 i = 1;
4880 }
4881 else
4882 {
4883 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4884 plts[j].plt_got_insn_size = non_lazy_plt->plt_got_insn_size;
4885 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4886 i = 0;
4887 }
4888
4889 /* Skip lazy PLT when the second PLT is used. */
4890 if (plt_type == (plt_lazy | plt_second))
4891 plts[j].count = 0;
4892 else
4893 {
4894 n = plt->size / plts[j].plt_entry_size;
4895 plts[j].count = n;
4896 count += n - i;
4897 }
4898
4899 plts[j].contents = plt_contents;
4900 }
4901
4902 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4903 (bfd_vma) 0, plts, dynsyms,
4904 ret);
4905 }
4906
4907 /* Handle an x86-64 specific section when reading an object file. This
4908 is called when elfcode.h finds a section with an unknown type. */
4909
4910 static bfd_boolean
4911 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
4912 const char *name, int shindex)
4913 {
4914 if (hdr->sh_type != SHT_X86_64_UNWIND)
4915 return FALSE;
4916
4917 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4918 return FALSE;
4919
4920 return TRUE;
4921 }
4922
4923 /* Hook called by the linker routine which adds symbols from an object
4924 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4925 of .bss. */
4926
4927 static bfd_boolean
4928 elf_x86_64_add_symbol_hook (bfd *abfd,
4929 struct bfd_link_info *info ATTRIBUTE_UNUSED,
4930 Elf_Internal_Sym *sym,
4931 const char **namep ATTRIBUTE_UNUSED,
4932 flagword *flagsp ATTRIBUTE_UNUSED,
4933 asection **secp,
4934 bfd_vma *valp)
4935 {
4936 asection *lcomm;
4937
4938 switch (sym->st_shndx)
4939 {
4940 case SHN_X86_64_LCOMMON:
4941 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4942 if (lcomm == NULL)
4943 {
4944 lcomm = bfd_make_section_with_flags (abfd,
4945 "LARGE_COMMON",
4946 (SEC_ALLOC
4947 | SEC_IS_COMMON
4948 | SEC_LINKER_CREATED));
4949 if (lcomm == NULL)
4950 return FALSE;
4951 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4952 }
4953 *secp = lcomm;
4954 *valp = sym->st_size;
4955 return TRUE;
4956 }
4957
4958 return TRUE;
4959 }
4960
4961
4962 /* Given a BFD section, try to locate the corresponding ELF section
4963 index. */
4964
4965 static bfd_boolean
4966 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4967 asection *sec, int *index_return)
4968 {
4969 if (sec == &_bfd_elf_large_com_section)
4970 {
4971 *index_return = SHN_X86_64_LCOMMON;
4972 return TRUE;
4973 }
4974 return FALSE;
4975 }
4976
4977 /* Process a symbol. */
4978
4979 static void
4980 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4981 asymbol *asym)
4982 {
4983 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4984
4985 switch (elfsym->internal_elf_sym.st_shndx)
4986 {
4987 case SHN_X86_64_LCOMMON:
4988 asym->section = &_bfd_elf_large_com_section;
4989 asym->value = elfsym->internal_elf_sym.st_size;
4990 /* Common symbol doesn't set BSF_GLOBAL. */
4991 asym->flags &= ~BSF_GLOBAL;
4992 break;
4993 }
4994 }
4995
4996 static bfd_boolean
4997 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
4998 {
4999 return (sym->st_shndx == SHN_COMMON
5000 || sym->st_shndx == SHN_X86_64_LCOMMON);
5001 }
5002
5003 static unsigned int
5004 elf_x86_64_common_section_index (asection *sec)
5005 {
5006 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5007 return SHN_COMMON;
5008 else
5009 return SHN_X86_64_LCOMMON;
5010 }
5011
5012 static asection *
5013 elf_x86_64_common_section (asection *sec)
5014 {
5015 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
5016 return bfd_com_section_ptr;
5017 else
5018 return &_bfd_elf_large_com_section;
5019 }
5020
5021 static bfd_boolean
5022 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
5023 const Elf_Internal_Sym *sym,
5024 asection **psec,
5025 bfd_boolean newdef,
5026 bfd_boolean olddef,
5027 bfd *oldbfd,
5028 const asection *oldsec)
5029 {
5030 /* A normal common symbol and a large common symbol result in a
5031 normal common symbol. We turn the large common symbol into a
5032 normal one. */
5033 if (!olddef
5034 && h->root.type == bfd_link_hash_common
5035 && !newdef
5036 && bfd_is_com_section (*psec)
5037 && oldsec != *psec)
5038 {
5039 if (sym->st_shndx == SHN_COMMON
5040 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
5041 {
5042 h->root.u.c.p->section
5043 = bfd_make_section_old_way (oldbfd, "COMMON");
5044 h->root.u.c.p->section->flags = SEC_ALLOC;
5045 }
5046 else if (sym->st_shndx == SHN_X86_64_LCOMMON
5047 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
5048 *psec = bfd_com_section_ptr;
5049 }
5050
5051 return TRUE;
5052 }
5053
5054 static int
5055 elf_x86_64_additional_program_headers (bfd *abfd,
5056 struct bfd_link_info *info ATTRIBUTE_UNUSED)
5057 {
5058 asection *s;
5059 int count = 0;
5060
5061 /* Check to see if we need a large readonly segment. */
5062 s = bfd_get_section_by_name (abfd, ".lrodata");
5063 if (s && (s->flags & SEC_LOAD))
5064 count++;
5065
5066 /* Check to see if we need a large data segment. Since .lbss sections
5067 is placed right after the .bss section, there should be no need for
5068 a large data segment just because of .lbss. */
5069 s = bfd_get_section_by_name (abfd, ".ldata");
5070 if (s && (s->flags & SEC_LOAD))
5071 count++;
5072
5073 return count;
5074 }
5075
5076 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5077
5078 static bfd_boolean
5079 elf_x86_64_relocs_compatible (const bfd_target *input,
5080 const bfd_target *output)
5081 {
5082 return ((xvec_get_elf_backend_data (input)->s->elfclass
5083 == xvec_get_elf_backend_data (output)->s->elfclass)
5084 && _bfd_elf_relocs_compatible (input, output));
5085 }
5086
5087 /* Set up x86-64 GNU properties. Return the first relocatable ELF input
5088 with GNU properties if found. Otherwise, return NULL. */
5089
5090 static bfd *
5091 elf_x86_64_link_setup_gnu_properties (struct bfd_link_info *info)
5092 {
5093 struct elf_x86_init_table init_table;
5094
5095 if ((int) R_X86_64_standard >= (int) R_X86_64_converted_reloc_bit
5096 || (int) R_X86_64_max <= (int) R_X86_64_converted_reloc_bit
5097 || ((int) (R_X86_64_GNU_VTINHERIT | R_X86_64_converted_reloc_bit)
5098 != (int) R_X86_64_GNU_VTINHERIT)
5099 || ((int) (R_X86_64_GNU_VTENTRY | R_X86_64_converted_reloc_bit)
5100 != (int) R_X86_64_GNU_VTENTRY))
5101 abort ();
5102
5103 init_table.is_vxworks = FALSE;
5104 if (get_elf_x86_64_backend_data (info->output_bfd)->os == is_normal)
5105 {
5106 if (info->bndplt)
5107 {
5108 init_table.lazy_plt = &elf_x86_64_lazy_bnd_plt;
5109 init_table.non_lazy_plt = &elf_x86_64_non_lazy_bnd_plt;
5110 }
5111 else
5112 {
5113 init_table.lazy_plt = &elf_x86_64_lazy_plt;
5114 init_table.non_lazy_plt = &elf_x86_64_non_lazy_plt;
5115 }
5116
5117 if (ABI_64_P (info->output_bfd))
5118 {
5119 init_table.lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt;
5120 init_table.non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt;
5121 }
5122 else
5123 {
5124 init_table.lazy_ibt_plt = &elf_x32_lazy_ibt_plt;
5125 init_table.non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt;
5126 }
5127 init_table.normal_target = TRUE;
5128 }
5129 else
5130 {
5131 init_table.lazy_plt = &elf_x86_64_nacl_plt;
5132 init_table.non_lazy_plt = NULL;
5133 init_table.lazy_ibt_plt = NULL;
5134 init_table.non_lazy_ibt_plt = NULL;
5135 init_table.normal_target = FALSE;
5136 }
5137
5138 if (ABI_64_P (info->output_bfd))
5139 {
5140 init_table.r_info = elf64_r_info;
5141 init_table.r_sym = elf64_r_sym;
5142 }
5143 else
5144 {
5145 init_table.r_info = elf32_r_info;
5146 init_table.r_sym = elf32_r_sym;
5147 }
5148
5149 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
5150 }
5151
5152 static const struct bfd_elf_special_section
5153 elf_x86_64_special_sections[]=
5154 {
5155 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5156 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5157 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
5158 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5159 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
5160 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
5161 { NULL, 0, 0, 0, 0 }
5162 };
5163
5164 #define TARGET_LITTLE_SYM x86_64_elf64_vec
5165 #define TARGET_LITTLE_NAME "elf64-x86-64"
5166 #define ELF_ARCH bfd_arch_i386
5167 #define ELF_TARGET_ID X86_64_ELF_DATA
5168 #define ELF_MACHINE_CODE EM_X86_64
5169 #define ELF_MAXPAGESIZE 0x200000
5170 #define ELF_MINPAGESIZE 0x1000
5171 #define ELF_COMMONPAGESIZE 0x1000
5172
5173 #define elf_backend_can_gc_sections 1
5174 #define elf_backend_can_refcount 1
5175 #define elf_backend_want_got_plt 1
5176 #define elf_backend_plt_readonly 1
5177 #define elf_backend_want_plt_sym 0
5178 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5179 #define elf_backend_rela_normal 1
5180 #define elf_backend_plt_alignment 4
5181 #define elf_backend_extern_protected_data 1
5182 #define elf_backend_caches_rawsize 1
5183 #define elf_backend_dtrel_excludes_plt 1
5184 #define elf_backend_want_dynrelro 1
5185
5186 #define elf_info_to_howto elf_x86_64_info_to_howto
5187
5188 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5189 #define bfd_elf64_bfd_reloc_name_lookup \
5190 elf_x86_64_reloc_name_lookup
5191
5192 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5193 #define elf_backend_check_relocs elf_x86_64_check_relocs
5194 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
5195 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5196 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5197 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
5198 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5199 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5200 #ifdef CORE_HEADER
5201 #define elf_backend_write_core_note elf_x86_64_write_core_note
5202 #endif
5203 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5204 #define elf_backend_relocate_section elf_x86_64_relocate_section
5205 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5206 #define elf_backend_object_p elf64_x86_64_elf_object_p
5207 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
5208
5209 #define elf_backend_section_from_shdr \
5210 elf_x86_64_section_from_shdr
5211
5212 #define elf_backend_section_from_bfd_section \
5213 elf_x86_64_elf_section_from_bfd_section
5214 #define elf_backend_add_symbol_hook \
5215 elf_x86_64_add_symbol_hook
5216 #define elf_backend_symbol_processing \
5217 elf_x86_64_symbol_processing
5218 #define elf_backend_common_section_index \
5219 elf_x86_64_common_section_index
5220 #define elf_backend_common_section \
5221 elf_x86_64_common_section
5222 #define elf_backend_common_definition \
5223 elf_x86_64_common_definition
5224 #define elf_backend_merge_symbol \
5225 elf_x86_64_merge_symbol
5226 #define elf_backend_special_sections \
5227 elf_x86_64_special_sections
5228 #define elf_backend_additional_program_headers \
5229 elf_x86_64_additional_program_headers
5230 #define elf_backend_setup_gnu_properties \
5231 elf_x86_64_link_setup_gnu_properties
5232
5233 #include "elf64-target.h"
5234
5235 /* CloudABI support. */
5236
5237 #undef TARGET_LITTLE_SYM
5238 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
5239 #undef TARGET_LITTLE_NAME
5240 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
5241
5242 #undef ELF_OSABI
5243 #define ELF_OSABI ELFOSABI_CLOUDABI
5244
5245 #undef elf64_bed
5246 #define elf64_bed elf64_x86_64_cloudabi_bed
5247
5248 #include "elf64-target.h"
5249
5250 /* FreeBSD support. */
5251
5252 #undef TARGET_LITTLE_SYM
5253 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
5254 #undef TARGET_LITTLE_NAME
5255 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5256
5257 #undef ELF_OSABI
5258 #define ELF_OSABI ELFOSABI_FREEBSD
5259
5260 #undef elf64_bed
5261 #define elf64_bed elf64_x86_64_fbsd_bed
5262
5263 #include "elf64-target.h"
5264
5265 /* Solaris 2 support. */
5266
5267 #undef TARGET_LITTLE_SYM
5268 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
5269 #undef TARGET_LITTLE_NAME
5270 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5271
5272 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5273 objects won't be recognized. */
5274 #undef ELF_OSABI
5275
5276 #undef elf64_bed
5277 #define elf64_bed elf64_x86_64_sol2_bed
5278
5279 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5280 boundary. */
5281 #undef elf_backend_static_tls_alignment
5282 #define elf_backend_static_tls_alignment 16
5283
5284 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5285
5286 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5287 File, p.63. */
5288 #undef elf_backend_want_plt_sym
5289 #define elf_backend_want_plt_sym 1
5290
5291 #undef elf_backend_strtab_flags
5292 #define elf_backend_strtab_flags SHF_STRINGS
5293
5294 static bfd_boolean
5295 elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
5296 bfd *obfd ATTRIBUTE_UNUSED,
5297 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
5298 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
5299 {
5300 /* PR 19938: FIXME: Need to add code for setting the sh_info
5301 and sh_link fields of Solaris specific section types. */
5302 return FALSE;
5303 }
5304
5305 #undef elf_backend_copy_special_section_fields
5306 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
5307
5308 #include "elf64-target.h"
5309
5310 /* Native Client support. */
5311
5312 static bfd_boolean
5313 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
5314 {
5315 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
5316 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
5317 return TRUE;
5318 }
5319
5320 #undef TARGET_LITTLE_SYM
5321 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
5322 #undef TARGET_LITTLE_NAME
5323 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
5324 #undef elf64_bed
5325 #define elf64_bed elf64_x86_64_nacl_bed
5326
5327 #undef ELF_MAXPAGESIZE
5328 #undef ELF_MINPAGESIZE
5329 #undef ELF_COMMONPAGESIZE
5330 #define ELF_MAXPAGESIZE 0x10000
5331 #define ELF_MINPAGESIZE 0x10000
5332 #define ELF_COMMONPAGESIZE 0x10000
5333
5334 /* Restore defaults. */
5335 #undef ELF_OSABI
5336 #undef elf_backend_static_tls_alignment
5337 #undef elf_backend_want_plt_sym
5338 #define elf_backend_want_plt_sym 0
5339 #undef elf_backend_strtab_flags
5340 #undef elf_backend_copy_special_section_fields
5341
5342 /* NaCl uses substantially different PLT entries for the same effects. */
5343
5344 #undef elf_backend_plt_alignment
5345 #define elf_backend_plt_alignment 5
5346 #define NACL_PLT_ENTRY_SIZE 64
5347 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5348
5349 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
5350 {
5351 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
5352 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
5353 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5354 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5355 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5356
5357 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
5358 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
5359
5360 /* 32 bytes of nop to pad out to the standard size. */
5361 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
5362 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5363 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
5364 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5365 0x66, /* excess data16 prefix */
5366 0x90 /* nop */
5367 };
5368
5369 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5370 {
5371 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
5372 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
5373 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
5374 0x41, 0xff, 0xe3, /* jmpq *%r11 */
5375
5376 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
5377 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
5378 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5379
5380 /* Lazy GOT entries point here (32-byte aligned). */
5381 0x68, /* pushq immediate */
5382 0, 0, 0, 0, /* replaced with index into relocation table. */
5383 0xe9, /* jmp relative */
5384 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
5385
5386 /* 22 bytes of nop to pad out to the standard size. */
5387 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
5388 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
5389 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
5390 };
5391
5392 /* .eh_frame covering the .plt section. */
5393
5394 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
5395 {
5396 #if (PLT_CIE_LENGTH != 20 \
5397 || PLT_FDE_LENGTH != 36 \
5398 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5399 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5400 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
5401 #endif
5402 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5403 0, 0, 0, 0, /* CIE ID */
5404 1, /* CIE version */
5405 'z', 'R', 0, /* Augmentation string */
5406 1, /* Code alignment factor */
5407 0x78, /* Data alignment factor */
5408 16, /* Return address column */
5409 1, /* Augmentation size */
5410 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5411 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
5412 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
5413 DW_CFA_nop, DW_CFA_nop,
5414
5415 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5416 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
5417 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
5418 0, 0, 0, 0, /* .plt size goes here */
5419 0, /* Augmentation size */
5420 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
5421 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5422 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
5423 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5424 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5425 13, /* Block length */
5426 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
5427 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
5428 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5429 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
5430 DW_CFA_nop, DW_CFA_nop
5431 };
5432
5433 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt =
5434 {
5435 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
5436 NACL_PLT_ENTRY_SIZE, /* plt0_entry_size */
5437 elf_x86_64_nacl_plt_entry, /* plt_entry */
5438 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5439 2, /* plt0_got1_offset */
5440 9, /* plt0_got2_offset */
5441 13, /* plt0_got2_insn_end */
5442 3, /* plt_got_offset */
5443 33, /* plt_reloc_offset */
5444 38, /* plt_plt_offset */
5445 7, /* plt_got_insn_size */
5446 42, /* plt_plt_insn_end */
5447 32, /* plt_lazy_offset */
5448 elf_x86_64_nacl_plt0_entry, /* pic_plt0_entry */
5449 elf_x86_64_nacl_plt_entry, /* pic_plt_entry */
5450 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
5451 sizeof (elf_x86_64_nacl_eh_frame_plt) /* eh_frame_plt_size */
5452 };
5453
5454 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
5455 {
5456 is_nacl /* os */
5457 };
5458
5459 #undef elf_backend_arch_data
5460 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
5461
5462 #undef elf_backend_object_p
5463 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
5464 #undef elf_backend_modify_segment_map
5465 #define elf_backend_modify_segment_map nacl_modify_segment_map
5466 #undef elf_backend_modify_program_headers
5467 #define elf_backend_modify_program_headers nacl_modify_program_headers
5468 #undef elf_backend_final_write_processing
5469 #define elf_backend_final_write_processing nacl_final_write_processing
5470
5471 #include "elf64-target.h"
5472
5473 /* Native Client x32 support. */
5474
5475 static bfd_boolean
5476 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
5477 {
5478 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
5479 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
5480 return TRUE;
5481 }
5482
5483 #undef TARGET_LITTLE_SYM
5484 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
5485 #undef TARGET_LITTLE_NAME
5486 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
5487 #undef elf32_bed
5488 #define elf32_bed elf32_x86_64_nacl_bed
5489
5490 #define bfd_elf32_bfd_reloc_type_lookup \
5491 elf_x86_64_reloc_type_lookup
5492 #define bfd_elf32_bfd_reloc_name_lookup \
5493 elf_x86_64_reloc_name_lookup
5494 #define bfd_elf32_get_synthetic_symtab \
5495 elf_x86_64_get_synthetic_symtab
5496
5497 #undef elf_backend_object_p
5498 #define elf_backend_object_p \
5499 elf32_x86_64_nacl_elf_object_p
5500
5501 #undef elf_backend_bfd_from_remote_memory
5502 #define elf_backend_bfd_from_remote_memory \
5503 _bfd_elf32_bfd_from_remote_memory
5504
5505 #undef elf_backend_size_info
5506 #define elf_backend_size_info \
5507 _bfd_elf32_size_info
5508
5509 #include "elf32-target.h"
5510
5511 /* Restore defaults. */
5512 #undef elf_backend_object_p
5513 #define elf_backend_object_p elf64_x86_64_elf_object_p
5514 #undef elf_backend_bfd_from_remote_memory
5515 #undef elf_backend_size_info
5516 #undef elf_backend_modify_segment_map
5517 #undef elf_backend_modify_program_headers
5518 #undef elf_backend_final_write_processing
5519
5520 /* Intel L1OM support. */
5521
5522 static bfd_boolean
5523 elf64_l1om_elf_object_p (bfd *abfd)
5524 {
5525 /* Set the right machine number for an L1OM elf64 file. */
5526 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
5527 return TRUE;
5528 }
5529
5530 #undef TARGET_LITTLE_SYM
5531 #define TARGET_LITTLE_SYM l1om_elf64_vec
5532 #undef TARGET_LITTLE_NAME
5533 #define TARGET_LITTLE_NAME "elf64-l1om"
5534 #undef ELF_ARCH
5535 #define ELF_ARCH bfd_arch_l1om
5536
5537 #undef ELF_MACHINE_CODE
5538 #define ELF_MACHINE_CODE EM_L1OM
5539
5540 #undef ELF_OSABI
5541
5542 #undef elf64_bed
5543 #define elf64_bed elf64_l1om_bed
5544
5545 #undef elf_backend_object_p
5546 #define elf_backend_object_p elf64_l1om_elf_object_p
5547
5548 /* Restore defaults. */
5549 #undef ELF_MAXPAGESIZE
5550 #undef ELF_MINPAGESIZE
5551 #undef ELF_COMMONPAGESIZE
5552 #define ELF_MAXPAGESIZE 0x200000
5553 #define ELF_MINPAGESIZE 0x1000
5554 #define ELF_COMMONPAGESIZE 0x1000
5555 #undef elf_backend_plt_alignment
5556 #define elf_backend_plt_alignment 4
5557 #undef elf_backend_arch_data
5558 #define elf_backend_arch_data &elf_x86_64_arch_bed
5559
5560 #include "elf64-target.h"
5561
5562 /* FreeBSD L1OM support. */
5563
5564 #undef TARGET_LITTLE_SYM
5565 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
5566 #undef TARGET_LITTLE_NAME
5567 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
5568
5569 #undef ELF_OSABI
5570 #define ELF_OSABI ELFOSABI_FREEBSD
5571
5572 #undef elf64_bed
5573 #define elf64_bed elf64_l1om_fbsd_bed
5574
5575 #include "elf64-target.h"
5576
5577 /* Intel K1OM support. */
5578
5579 static bfd_boolean
5580 elf64_k1om_elf_object_p (bfd *abfd)
5581 {
5582 /* Set the right machine number for an K1OM elf64 file. */
5583 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
5584 return TRUE;
5585 }
5586
5587 #undef TARGET_LITTLE_SYM
5588 #define TARGET_LITTLE_SYM k1om_elf64_vec
5589 #undef TARGET_LITTLE_NAME
5590 #define TARGET_LITTLE_NAME "elf64-k1om"
5591 #undef ELF_ARCH
5592 #define ELF_ARCH bfd_arch_k1om
5593
5594 #undef ELF_MACHINE_CODE
5595 #define ELF_MACHINE_CODE EM_K1OM
5596
5597 #undef ELF_OSABI
5598
5599 #undef elf64_bed
5600 #define elf64_bed elf64_k1om_bed
5601
5602 #undef elf_backend_object_p
5603 #define elf_backend_object_p elf64_k1om_elf_object_p
5604
5605 #undef elf_backend_static_tls_alignment
5606
5607 #undef elf_backend_want_plt_sym
5608 #define elf_backend_want_plt_sym 0
5609
5610 #include "elf64-target.h"
5611
5612 /* FreeBSD K1OM support. */
5613
5614 #undef TARGET_LITTLE_SYM
5615 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
5616 #undef TARGET_LITTLE_NAME
5617 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
5618
5619 #undef ELF_OSABI
5620 #define ELF_OSABI ELFOSABI_FREEBSD
5621
5622 #undef elf64_bed
5623 #define elf64_bed elf64_k1om_fbsd_bed
5624
5625 #include "elf64-target.h"
5626
5627 /* 32bit x86-64 support. */
5628
5629 #undef TARGET_LITTLE_SYM
5630 #define TARGET_LITTLE_SYM x86_64_elf32_vec
5631 #undef TARGET_LITTLE_NAME
5632 #define TARGET_LITTLE_NAME "elf32-x86-64"
5633 #undef elf32_bed
5634
5635 #undef ELF_ARCH
5636 #define ELF_ARCH bfd_arch_i386
5637
5638 #undef ELF_MACHINE_CODE
5639 #define ELF_MACHINE_CODE EM_X86_64
5640
5641 #undef ELF_OSABI
5642
5643 #undef elf_backend_object_p
5644 #define elf_backend_object_p \
5645 elf32_x86_64_elf_object_p
5646
5647 #undef elf_backend_bfd_from_remote_memory
5648 #define elf_backend_bfd_from_remote_memory \
5649 _bfd_elf32_bfd_from_remote_memory
5650
5651 #undef elf_backend_size_info
5652 #define elf_backend_size_info \
5653 _bfd_elf32_size_info
5654
5655 #include "elf32-target.h"
GDB Binutils - Deliverables
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