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x86: Add _bfd_x86_elf_get_synthetic_symtab
[deliverable/binutils-gdb.git] / bfd / elf64-x86-64.c
1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2017 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "elfxx-x86.h"
23 #include "elf-nacl.h"
24 #include "dwarf2.h"
25 #include "libiberty.h"
26
27 #include "opcode/i386.h"
28 #include "elf/x86-64.h"
29
30 #ifdef CORE_HEADER
31 #include <stdarg.h>
32 #include CORE_HEADER
33 #endif
34
35 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
36 #define MINUS_ONE (~ (bfd_vma) 0)
37
38 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
39 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
40 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
41 since they are the same. */
42
43 /* The relocation "howto" table. Order of fields:
44 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
45 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
46 static reloc_howto_type x86_64_elf_howto_table[] =
47 {
48 HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
49 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
50 FALSE),
51 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
53 FALSE),
54 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
55 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
56 TRUE),
57 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
58 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
59 FALSE),
60 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
61 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
62 TRUE),
63 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
65 FALSE),
66 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
68 MINUS_ONE, FALSE),
69 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
71 MINUS_ONE, FALSE),
72 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
74 MINUS_ONE, FALSE),
75 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
76 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
77 0xffffffff, TRUE),
78 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
79 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
80 FALSE),
81 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
82 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
83 FALSE),
84 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
86 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
88 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
90 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
91 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
92 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
94 MINUS_ONE, FALSE),
95 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
97 MINUS_ONE, FALSE),
98 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
100 MINUS_ONE, FALSE),
101 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
102 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
103 0xffffffff, TRUE),
104 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
105 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
106 0xffffffff, TRUE),
107 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
108 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
109 0xffffffff, FALSE),
110 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
112 0xffffffff, TRUE),
113 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
114 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
115 0xffffffff, FALSE),
116 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
118 TRUE),
119 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
121 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
122 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
123 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
124 FALSE, 0xffffffff, 0xffffffff, TRUE),
125 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
126 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
127 FALSE),
128 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
129 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
130 MINUS_ONE, TRUE),
131 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
132 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
133 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
134 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
135 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
136 MINUS_ONE, FALSE),
137 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
138 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
139 MINUS_ONE, FALSE),
140 HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
141 bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
142 FALSE),
143 HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
144 bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
145 FALSE),
146 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
147 complain_overflow_bitfield, bfd_elf_generic_reloc,
148 "R_X86_64_GOTPC32_TLSDESC",
149 FALSE, 0xffffffff, 0xffffffff, TRUE),
150 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
151 complain_overflow_dont, bfd_elf_generic_reloc,
152 "R_X86_64_TLSDESC_CALL",
153 FALSE, 0, 0, FALSE),
154 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
155 complain_overflow_bitfield, bfd_elf_generic_reloc,
156 "R_X86_64_TLSDESC",
157 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
158 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
159 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
160 MINUS_ONE, FALSE),
161 HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
162 bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
163 MINUS_ONE, FALSE),
164 HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
165 bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
166 TRUE),
167 HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
168 bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
169 TRUE),
170 HOWTO(R_X86_64_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
171 bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", FALSE, 0xffffffff,
172 0xffffffff, TRUE),
173 HOWTO(R_X86_64_REX_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
174 bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", FALSE, 0xffffffff,
175 0xffffffff, TRUE),
176
177 /* We have a gap in the reloc numbers here.
178 R_X86_64_standard counts the number up to this point, and
179 R_X86_64_vt_offset is the value to subtract from a reloc type of
180 R_X86_64_GNU_VT* to form an index into this table. */
181 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
182 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
183
184 /* GNU extension to record C++ vtable hierarchy. */
185 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
186 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
187
188 /* GNU extension to record C++ vtable member usage. */
189 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
190 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
191 FALSE),
192
193 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
194 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
195 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
196 FALSE)
197 };
198
199 #define IS_X86_64_PCREL_TYPE(TYPE) \
200 ( ((TYPE) == R_X86_64_PC8) \
201 || ((TYPE) == R_X86_64_PC16) \
202 || ((TYPE) == R_X86_64_PC32) \
203 || ((TYPE) == R_X86_64_PC32_BND) \
204 || ((TYPE) == R_X86_64_PC64))
205
206 /* Map BFD relocs to the x86_64 elf relocs. */
207 struct elf_reloc_map
208 {
209 bfd_reloc_code_real_type bfd_reloc_val;
210 unsigned char elf_reloc_val;
211 };
212
213 static const struct elf_reloc_map x86_64_reloc_map[] =
214 {
215 { BFD_RELOC_NONE, R_X86_64_NONE, },
216 { BFD_RELOC_64, R_X86_64_64, },
217 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
218 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
219 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
220 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
221 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
222 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
223 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
224 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
225 { BFD_RELOC_32, R_X86_64_32, },
226 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
227 { BFD_RELOC_16, R_X86_64_16, },
228 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
229 { BFD_RELOC_8, R_X86_64_8, },
230 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
231 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
232 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
233 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
234 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
235 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
236 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
237 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
238 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
239 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
240 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
241 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
242 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
243 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
244 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
245 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
246 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
247 { BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
248 { BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
249 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
250 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
251 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
252 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
253 { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, },
254 { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, },
255 { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, },
256 { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, },
257 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
258 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
259 };
260
261 static reloc_howto_type *
262 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
263 {
264 unsigned i;
265
266 if (r_type == (unsigned int) R_X86_64_32)
267 {
268 if (ABI_64_P (abfd))
269 i = r_type;
270 else
271 i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
272 }
273 else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
274 || r_type >= (unsigned int) R_X86_64_max)
275 {
276 if (r_type >= (unsigned int) R_X86_64_standard)
277 {
278 /* xgettext:c-format */
279 _bfd_error_handler (_("%B: invalid relocation type %d"),
280 abfd, (int) r_type);
281 r_type = R_X86_64_NONE;
282 }
283 i = r_type;
284 }
285 else
286 i = r_type - (unsigned int) R_X86_64_vt_offset;
287 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
288 return &x86_64_elf_howto_table[i];
289 }
290
291 /* Given a BFD reloc type, return a HOWTO structure. */
292 static reloc_howto_type *
293 elf_x86_64_reloc_type_lookup (bfd *abfd,
294 bfd_reloc_code_real_type code)
295 {
296 unsigned int i;
297
298 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
299 i++)
300 {
301 if (x86_64_reloc_map[i].bfd_reloc_val == code)
302 return elf_x86_64_rtype_to_howto (abfd,
303 x86_64_reloc_map[i].elf_reloc_val);
304 }
305 return NULL;
306 }
307
308 static reloc_howto_type *
309 elf_x86_64_reloc_name_lookup (bfd *abfd,
310 const char *r_name)
311 {
312 unsigned int i;
313
314 if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
315 {
316 /* Get x32 R_X86_64_32. */
317 reloc_howto_type *reloc
318 = &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
319 BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
320 return reloc;
321 }
322
323 for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
324 if (x86_64_elf_howto_table[i].name != NULL
325 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
326 return &x86_64_elf_howto_table[i];
327
328 return NULL;
329 }
330
331 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
332
333 static void
334 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
335 Elf_Internal_Rela *dst)
336 {
337 unsigned r_type;
338
339 r_type = ELF32_R_TYPE (dst->r_info);
340 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
341 BFD_ASSERT (r_type == cache_ptr->howto->type);
342 }
343 \f
344 /* Support for core dump NOTE sections. */
345 static bfd_boolean
346 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
347 {
348 int offset;
349 size_t size;
350
351 switch (note->descsz)
352 {
353 default:
354 return FALSE;
355
356 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
357 /* pr_cursig */
358 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
359
360 /* pr_pid */
361 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
362
363 /* pr_reg */
364 offset = 72;
365 size = 216;
366
367 break;
368
369 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
370 /* pr_cursig */
371 elf_tdata (abfd)->core->signal
372 = bfd_get_16 (abfd, note->descdata + 12);
373
374 /* pr_pid */
375 elf_tdata (abfd)->core->lwpid
376 = bfd_get_32 (abfd, note->descdata + 32);
377
378 /* pr_reg */
379 offset = 112;
380 size = 216;
381
382 break;
383 }
384
385 /* Make a ".reg/999" section. */
386 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
387 size, note->descpos + offset);
388 }
389
390 static bfd_boolean
391 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
392 {
393 switch (note->descsz)
394 {
395 default:
396 return FALSE;
397
398 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
399 elf_tdata (abfd)->core->pid
400 = bfd_get_32 (abfd, note->descdata + 12);
401 elf_tdata (abfd)->core->program
402 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
403 elf_tdata (abfd)->core->command
404 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
405 break;
406
407 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
408 elf_tdata (abfd)->core->pid
409 = bfd_get_32 (abfd, note->descdata + 24);
410 elf_tdata (abfd)->core->program
411 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
412 elf_tdata (abfd)->core->command
413 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
414 }
415
416 /* Note that for some reason, a spurious space is tacked
417 onto the end of the args in some (at least one anyway)
418 implementations, so strip it off if it exists. */
419
420 {
421 char *command = elf_tdata (abfd)->core->command;
422 int n = strlen (command);
423
424 if (0 < n && command[n - 1] == ' ')
425 command[n - 1] = '\0';
426 }
427
428 return TRUE;
429 }
430
431 #ifdef CORE_HEADER
432 static char *
433 elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
434 int note_type, ...)
435 {
436 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
437 va_list ap;
438 const char *fname, *psargs;
439 long pid;
440 int cursig;
441 const void *gregs;
442
443 switch (note_type)
444 {
445 default:
446 return NULL;
447
448 case NT_PRPSINFO:
449 va_start (ap, note_type);
450 fname = va_arg (ap, const char *);
451 psargs = va_arg (ap, const char *);
452 va_end (ap);
453
454 if (bed->s->elfclass == ELFCLASS32)
455 {
456 prpsinfo32_t data;
457 memset (&data, 0, sizeof (data));
458 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
459 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
460 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
461 &data, sizeof (data));
462 }
463 else
464 {
465 prpsinfo64_t data;
466 memset (&data, 0, sizeof (data));
467 strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
468 strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
469 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
470 &data, sizeof (data));
471 }
472 /* NOTREACHED */
473
474 case NT_PRSTATUS:
475 va_start (ap, note_type);
476 pid = va_arg (ap, long);
477 cursig = va_arg (ap, int);
478 gregs = va_arg (ap, const void *);
479 va_end (ap);
480
481 if (bed->s->elfclass == ELFCLASS32)
482 {
483 if (bed->elf_machine_code == EM_X86_64)
484 {
485 prstatusx32_t prstat;
486 memset (&prstat, 0, sizeof (prstat));
487 prstat.pr_pid = pid;
488 prstat.pr_cursig = cursig;
489 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
490 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
491 &prstat, sizeof (prstat));
492 }
493 else
494 {
495 prstatus32_t prstat;
496 memset (&prstat, 0, sizeof (prstat));
497 prstat.pr_pid = pid;
498 prstat.pr_cursig = cursig;
499 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
500 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
501 &prstat, sizeof (prstat));
502 }
503 }
504 else
505 {
506 prstatus64_t prstat;
507 memset (&prstat, 0, sizeof (prstat));
508 prstat.pr_pid = pid;
509 prstat.pr_cursig = cursig;
510 memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
511 return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
512 &prstat, sizeof (prstat));
513 }
514 }
515 /* NOTREACHED */
516 }
517 #endif
518 \f
519 /* Functions for the x86-64 ELF linker. */
520
521 /* The size in bytes of an entry in the global offset table. */
522
523 #define GOT_ENTRY_SIZE 8
524
525 /* The size in bytes of an entry in the lazy procedure linkage table. */
526
527 #define LAZY_PLT_ENTRY_SIZE 16
528
529 /* The size in bytes of an entry in the non-lazy procedure linkage
530 table. */
531
532 #define NON_LAZY_PLT_ENTRY_SIZE 8
533
534 /* The first entry in a lazy procedure linkage table looks like this.
535 See the SVR4 ABI i386 supplement and the x86-64 ABI to see how this
536 works. */
537
538 static const bfd_byte elf_x86_64_lazy_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
539 {
540 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
541 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
542 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
543 };
544
545 /* Subsequent entries in a lazy procedure linkage table look like this. */
546
547 static const bfd_byte elf_x86_64_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
548 {
549 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
550 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
551 0x68, /* pushq immediate */
552 0, 0, 0, 0, /* replaced with index into relocation table. */
553 0xe9, /* jmp relative */
554 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
555 };
556
557 /* The first entry in a lazy procedure linkage table with BND prefix
558 like this. */
559
560 static const bfd_byte elf_x86_64_lazy_bnd_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
561 {
562 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
563 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
564 0x0f, 0x1f, 0 /* nopl (%rax) */
565 };
566
567 /* Subsequent entries for branches with BND prefx in a lazy procedure
568 linkage table look like this. */
569
570 static const bfd_byte elf_x86_64_lazy_bnd_plt_entry[LAZY_PLT_ENTRY_SIZE] =
571 {
572 0x68, 0, 0, 0, 0, /* pushq immediate */
573 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
574 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
575 };
576
577 /* The first entry in the IBT-enabled lazy procedure linkage table is the
578 the same as the lazy PLT with BND prefix so that bound registers are
579 preserved when control is passed to dynamic linker. Subsequent
580 entries for a IBT-enabled lazy procedure linkage table look like
581 this. */
582
583 static const bfd_byte elf_x86_64_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
584 {
585 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
586 0x68, 0, 0, 0, 0, /* pushq immediate */
587 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
588 0x90 /* nop */
589 };
590
591 /* The first entry in the x32 IBT-enabled lazy procedure linkage table
592 is the same as the normal lazy PLT. Subsequent entries for an
593 x32 IBT-enabled lazy procedure linkage table look like this. */
594
595 static const bfd_byte elf_x32_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
596 {
597 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
598 0x68, 0, 0, 0, 0, /* pushq immediate */
599 0xe9, 0, 0, 0, 0, /* jmpq relative */
600 0x66, 0x90 /* xchg %ax,%ax */
601 };
602
603 /* Entries in the non-lazey procedure linkage table look like this. */
604
605 static const bfd_byte elf_x86_64_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
606 {
607 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
608 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
610 };
611
612 /* Entries for branches with BND prefix in the non-lazey procedure
613 linkage table look like this. */
614
615 static const bfd_byte elf_x86_64_non_lazy_bnd_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
616 {
617 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
618 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
619 0x90 /* nop */
620 };
621
622 /* Entries for branches with IBT-enabled in the non-lazey procedure
623 linkage table look like this. They have the same size as the lazy
624 PLT entry. */
625
626 static const bfd_byte elf_x86_64_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
627 {
628 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
629 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
630 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
631 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopl 0x0(%rax,%rax,1) */
632 };
633
634 /* Entries for branches with IBT-enabled in the x32 non-lazey procedure
635 linkage table look like this. They have the same size as the lazy
636 PLT entry. */
637
638 static const bfd_byte elf_x32_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
639 {
640 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
641 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
642 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
643 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
644 };
645
646 /* .eh_frame covering the lazy .plt section. */
647
648 static const bfd_byte elf_x86_64_eh_frame_lazy_plt[] =
649 {
650 #define PLT_CIE_LENGTH 20
651 #define PLT_FDE_LENGTH 36
652 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
653 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
654 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
655 0, 0, 0, 0, /* CIE ID */
656 1, /* CIE version */
657 'z', 'R', 0, /* Augmentation string */
658 1, /* Code alignment factor */
659 0x78, /* Data alignment factor */
660 16, /* Return address column */
661 1, /* Augmentation size */
662 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
663 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
664 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
665 DW_CFA_nop, DW_CFA_nop,
666
667 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
668 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
669 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
670 0, 0, 0, 0, /* .plt size goes here */
671 0, /* Augmentation size */
672 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
673 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
674 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
675 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
676 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
677 11, /* Block length */
678 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
679 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
680 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
681 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
682 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
683 };
684
685 /* .eh_frame covering the lazy BND .plt section. */
686
687 static const bfd_byte elf_x86_64_eh_frame_lazy_bnd_plt[] =
688 {
689 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
690 0, 0, 0, 0, /* CIE ID */
691 1, /* CIE version */
692 'z', 'R', 0, /* Augmentation string */
693 1, /* Code alignment factor */
694 0x78, /* Data alignment factor */
695 16, /* Return address column */
696 1, /* Augmentation size */
697 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
698 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
699 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
700 DW_CFA_nop, DW_CFA_nop,
701
702 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
703 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
704 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
705 0, 0, 0, 0, /* .plt size goes here */
706 0, /* Augmentation size */
707 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
708 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
709 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
710 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
711 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
712 11, /* Block length */
713 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
714 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
715 DW_OP_lit15, DW_OP_and, DW_OP_lit5, DW_OP_ge,
716 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
717 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
718 };
719
720 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
721
722 static const bfd_byte elf_x86_64_eh_frame_lazy_ibt_plt[] =
723 {
724 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
725 0, 0, 0, 0, /* CIE ID */
726 1, /* CIE version */
727 'z', 'R', 0, /* Augmentation string */
728 1, /* Code alignment factor */
729 0x78, /* Data alignment factor */
730 16, /* Return address column */
731 1, /* Augmentation size */
732 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
733 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
734 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
735 DW_CFA_nop, DW_CFA_nop,
736
737 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
738 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
739 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
740 0, 0, 0, 0, /* .plt size goes here */
741 0, /* Augmentation size */
742 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
743 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
744 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
745 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
746 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
747 11, /* Block length */
748 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
749 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
750 DW_OP_lit15, DW_OP_and, DW_OP_lit10, DW_OP_ge,
751 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
752 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
753 };
754
755 /* .eh_frame covering the x32 lazy .plt section with IBT-enabled. */
756
757 static const bfd_byte elf_x32_eh_frame_lazy_ibt_plt[] =
758 {
759 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
760 0, 0, 0, 0, /* CIE ID */
761 1, /* CIE version */
762 'z', 'R', 0, /* Augmentation string */
763 1, /* Code alignment factor */
764 0x78, /* Data alignment factor */
765 16, /* Return address column */
766 1, /* Augmentation size */
767 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
768 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
769 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
770 DW_CFA_nop, DW_CFA_nop,
771
772 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
773 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
774 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
775 0, 0, 0, 0, /* .plt size goes here */
776 0, /* Augmentation size */
777 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
778 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
779 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
780 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
781 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
782 11, /* Block length */
783 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
784 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
785 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
786 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
787 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
788 };
789
790 /* .eh_frame covering the non-lazy .plt section. */
791
792 static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt[] =
793 {
794 #define PLT_GOT_FDE_LENGTH 20
795 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
796 0, 0, 0, 0, /* CIE ID */
797 1, /* CIE version */
798 'z', 'R', 0, /* Augmentation string */
799 1, /* Code alignment factor */
800 0x78, /* Data alignment factor */
801 16, /* Return address column */
802 1, /* Augmentation size */
803 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
804 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
805 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
806 DW_CFA_nop, DW_CFA_nop,
807
808 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
809 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
810 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
811 0, 0, 0, 0, /* non-lazy .plt size goes here */
812 0, /* Augmentation size */
813 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop,
814 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
815 };
816
817 /* Architecture-specific backend data for x86-64. */
818
819 struct elf_x86_64_backend_data
820 {
821 /* Target system. */
822 enum
823 {
824 is_normal,
825 is_nacl
826 } os;
827 };
828
829 #define get_elf_x86_64_arch_data(bed) \
830 ((const struct elf_x86_64_backend_data *) (bed)->arch_data)
831
832 #define get_elf_x86_64_backend_data(abfd) \
833 get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
834
835 /* These are the standard parameters. */
836 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt =
837 {
838 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
839 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
840 elf_x86_64_lazy_plt_entry, /* plt_entry */
841 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
842 2, /* plt0_got1_offset */
843 8, /* plt0_got2_offset */
844 12, /* plt0_got2_insn_end */
845 2, /* plt_got_offset */
846 7, /* plt_reloc_offset */
847 12, /* plt_plt_offset */
848 6, /* plt_got_insn_size */
849 LAZY_PLT_ENTRY_SIZE, /* plt_plt_insn_end */
850 6, /* plt_lazy_offset */
851 NULL, /* pic_plt0_entry */
852 NULL, /* pic_plt_entry */
853 elf_x86_64_eh_frame_lazy_plt, /* eh_frame_plt */
854 sizeof (elf_x86_64_eh_frame_lazy_plt) /* eh_frame_plt_size */
855 };
856
857 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_plt =
858 {
859 elf_x86_64_non_lazy_plt_entry, /* plt_entry */
860 NULL, /* pic_plt_entry */
861 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
862 2, /* plt_got_offset */
863 6, /* plt_got_insn_size */
864 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
865 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
866 };
867
868 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_bnd_plt =
869 {
870 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
871 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
872 elf_x86_64_lazy_bnd_plt_entry, /* plt_entry */
873 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
874 2, /* plt0_got1_offset */
875 1+8, /* plt0_got2_offset */
876 1+12, /* plt0_got2_insn_end */
877 1+2, /* plt_got_offset */
878 1, /* plt_reloc_offset */
879 7, /* plt_plt_offset */
880 1+6, /* plt_got_insn_size */
881 11, /* plt_plt_insn_end */
882 0, /* plt_lazy_offset */
883 NULL, /* pic_plt0_entry */
884 NULL, /* pic_plt_entry */
885 elf_x86_64_eh_frame_lazy_bnd_plt, /* eh_frame_plt */
886 sizeof (elf_x86_64_eh_frame_lazy_bnd_plt) /* eh_frame_plt_size */
887 };
888
889 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_bnd_plt =
890 {
891 elf_x86_64_non_lazy_bnd_plt_entry, /* plt_entry */
892 NULL, /* pic_plt_entry */
893 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
894 1+2, /* plt_got_offset */
895 1+6, /* plt_got_insn_size */
896 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
897 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
898 };
899
900 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_ibt_plt =
901 {
902 elf_x86_64_lazy_bnd_plt0_entry, /* plt0_entry */
903 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
904 elf_x86_64_lazy_ibt_plt_entry, /* plt_entry */
905 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
906 2, /* plt0_got1_offset */
907 1+8, /* plt0_got2_offset */
908 1+12, /* plt0_got2_insn_end */
909 4+1+2, /* plt_got_offset */
910 4+1, /* plt_reloc_offset */
911 4+1+6, /* plt_plt_offset */
912 4+1+6, /* plt_got_insn_size */
913 4+1+5+5, /* plt_plt_insn_end */
914 0, /* plt_lazy_offset */
915 NULL, /* pic_plt0_entry */
916 NULL, /* pic_plt_entry */
917 elf_x86_64_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
918 sizeof (elf_x86_64_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
919 };
920
921 static const struct elf_x86_lazy_plt_layout elf_x32_lazy_ibt_plt =
922 {
923 elf_x86_64_lazy_plt0_entry, /* plt0_entry */
924 LAZY_PLT_ENTRY_SIZE, /* plt0_entry_size */
925 elf_x32_lazy_ibt_plt_entry, /* plt_entry */
926 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
927 2, /* plt0_got1_offset */
928 8, /* plt0_got2_offset */
929 12, /* plt0_got2_insn_end */
930 4+2, /* plt_got_offset */
931 4+1, /* plt_reloc_offset */
932 4+6, /* plt_plt_offset */
933 4+6, /* plt_got_insn_size */
934 4+5+5, /* plt_plt_insn_end */
935 0, /* plt_lazy_offset */
936 NULL, /* pic_plt0_entry */
937 NULL, /* pic_plt_entry */
938 elf_x32_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
939 sizeof (elf_x32_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
940 };
941
942 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_ibt_plt =
943 {
944 elf_x86_64_non_lazy_ibt_plt_entry, /* plt_entry */
945 NULL, /* pic_plt_entry */
946 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
947 4+1+2, /* plt_got_offset */
948 4+1+6, /* plt_got_insn_size */
949 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
950 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
951 };
952
953 static const struct elf_x86_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt =
954 {
955 elf_x32_non_lazy_ibt_plt_entry, /* plt_entry */
956 NULL, /* pic_plt_entry */
957 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
958 4+2, /* plt_got_offset */
959 4+6, /* plt_got_insn_size */
960 elf_x86_64_eh_frame_non_lazy_plt, /* eh_frame_plt */
961 sizeof (elf_x86_64_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
962 };
963
964 static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
965 {
966 is_normal /* os */
967 };
968
969 #define elf_backend_arch_data &elf_x86_64_arch_bed
970
971 /* Values in tls_type of x86 ELF linker hash entry. */
972 #define GOT_TLS_IE 3
973 #define GOT_TLS_GDESC 4
974 #define GOT_TLS_GD_BOTH_P(type) \
975 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
976 #define GOT_TLS_GD_P(type) \
977 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
978 #define GOT_TLS_GDESC_P(type) \
979 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
980 #define GOT_TLS_GD_ANY_P(type) \
981 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
982
983 #define is_x86_64_elf(bfd) \
984 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
985 && elf_tdata (bfd) != NULL \
986 && elf_object_id (bfd) == X86_64_ELF_DATA)
987
988 static bfd_boolean
989 elf_x86_64_mkobject (bfd *abfd)
990 {
991 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_obj_tdata),
992 X86_64_ELF_DATA);
993 }
994
995 #define elf_x86_64_compute_jump_table_size(htab) \
996 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
997
998 static bfd_boolean
999 elf64_x86_64_elf_object_p (bfd *abfd)
1000 {
1001 /* Set the right machine number for an x86-64 elf64 file. */
1002 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
1003 return TRUE;
1004 }
1005
1006 static bfd_boolean
1007 elf32_x86_64_elf_object_p (bfd *abfd)
1008 {
1009 /* Set the right machine number for an x86-64 elf32 file. */
1010 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
1011 return TRUE;
1012 }
1013
1014 /* Return TRUE if the TLS access code sequence support transition
1015 from R_TYPE. */
1016
1017 static bfd_boolean
1018 elf_x86_64_check_tls_transition (bfd *abfd,
1019 struct bfd_link_info *info,
1020 asection *sec,
1021 bfd_byte *contents,
1022 Elf_Internal_Shdr *symtab_hdr,
1023 struct elf_link_hash_entry **sym_hashes,
1024 unsigned int r_type,
1025 const Elf_Internal_Rela *rel,
1026 const Elf_Internal_Rela *relend)
1027 {
1028 unsigned int val;
1029 unsigned long r_symndx;
1030 bfd_boolean largepic = FALSE;
1031 struct elf_link_hash_entry *h;
1032 bfd_vma offset;
1033 struct elf_x86_link_hash_table *htab;
1034 bfd_byte *call;
1035 bfd_boolean indirect_call;
1036
1037 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1038 offset = rel->r_offset;
1039 switch (r_type)
1040 {
1041 case R_X86_64_TLSGD:
1042 case R_X86_64_TLSLD:
1043 if ((rel + 1) >= relend)
1044 return FALSE;
1045
1046 if (r_type == R_X86_64_TLSGD)
1047 {
1048 /* Check transition from GD access model. For 64bit, only
1049 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1050 .word 0x6666; rex64; call __tls_get_addr@PLT
1051 or
1052 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1053 .byte 0x66; rex64
1054 call *__tls_get_addr@GOTPCREL(%rip)
1055 which may be converted to
1056 addr32 call __tls_get_addr
1057 can transit to different access model. For 32bit, only
1058 leaq foo@tlsgd(%rip), %rdi
1059 .word 0x6666; rex64; call __tls_get_addr@PLT
1060 or
1061 leaq foo@tlsgd(%rip), %rdi
1062 .byte 0x66; rex64
1063 call *__tls_get_addr@GOTPCREL(%rip)
1064 which may be converted to
1065 addr32 call __tls_get_addr
1066 can transit to different access model. For largepic,
1067 we also support:
1068 leaq foo@tlsgd(%rip), %rdi
1069 movabsq $__tls_get_addr@pltoff, %rax
1070 addq $r15, %rax
1071 call *%rax
1072 or
1073 leaq foo@tlsgd(%rip), %rdi
1074 movabsq $__tls_get_addr@pltoff, %rax
1075 addq $rbx, %rax
1076 call *%rax */
1077
1078 static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
1079
1080 if ((offset + 12) > sec->size)
1081 return FALSE;
1082
1083 call = contents + offset + 4;
1084 if (call[0] != 0x66
1085 || !((call[1] == 0x48
1086 && call[2] == 0xff
1087 && call[3] == 0x15)
1088 || (call[1] == 0x48
1089 && call[2] == 0x67
1090 && call[3] == 0xe8)
1091 || (call[1] == 0x66
1092 && call[2] == 0x48
1093 && call[3] == 0xe8)))
1094 {
1095 if (!ABI_64_P (abfd)
1096 || (offset + 19) > sec->size
1097 || offset < 3
1098 || memcmp (call - 7, leaq + 1, 3) != 0
1099 || memcmp (call, "\x48\xb8", 2) != 0
1100 || call[11] != 0x01
1101 || call[13] != 0xff
1102 || call[14] != 0xd0
1103 || !((call[10] == 0x48 && call[12] == 0xd8)
1104 || (call[10] == 0x4c && call[12] == 0xf8)))
1105 return FALSE;
1106 largepic = TRUE;
1107 }
1108 else if (ABI_64_P (abfd))
1109 {
1110 if (offset < 4
1111 || memcmp (contents + offset - 4, leaq, 4) != 0)
1112 return FALSE;
1113 }
1114 else
1115 {
1116 if (offset < 3
1117 || memcmp (contents + offset - 3, leaq + 1, 3) != 0)
1118 return FALSE;
1119 }
1120 indirect_call = call[2] == 0xff;
1121 }
1122 else
1123 {
1124 /* Check transition from LD access model. Only
1125 leaq foo@tlsld(%rip), %rdi;
1126 call __tls_get_addr@PLT
1127 or
1128 leaq foo@tlsld(%rip), %rdi;
1129 call *__tls_get_addr@GOTPCREL(%rip)
1130 which may be converted to
1131 addr32 call __tls_get_addr
1132 can transit to different access model. For largepic
1133 we also support:
1134 leaq foo@tlsld(%rip), %rdi
1135 movabsq $__tls_get_addr@pltoff, %rax
1136 addq $r15, %rax
1137 call *%rax
1138 or
1139 leaq foo@tlsld(%rip), %rdi
1140 movabsq $__tls_get_addr@pltoff, %rax
1141 addq $rbx, %rax
1142 call *%rax */
1143
1144 static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
1145
1146 if (offset < 3 || (offset + 9) > sec->size)
1147 return FALSE;
1148
1149 if (memcmp (contents + offset - 3, lea, 3) != 0)
1150 return FALSE;
1151
1152 call = contents + offset + 4;
1153 if (!(call[0] == 0xe8
1154 || (call[0] == 0xff && call[1] == 0x15)
1155 || (call[0] == 0x67 && call[1] == 0xe8)))
1156 {
1157 if (!ABI_64_P (abfd)
1158 || (offset + 19) > sec->size
1159 || memcmp (call, "\x48\xb8", 2) != 0
1160 || call[11] != 0x01
1161 || call[13] != 0xff
1162 || call[14] != 0xd0
1163 || !((call[10] == 0x48 && call[12] == 0xd8)
1164 || (call[10] == 0x4c && call[12] == 0xf8)))
1165 return FALSE;
1166 largepic = TRUE;
1167 }
1168 indirect_call = call[0] == 0xff;
1169 }
1170
1171 r_symndx = htab->r_sym (rel[1].r_info);
1172 if (r_symndx < symtab_hdr->sh_info)
1173 return FALSE;
1174
1175 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1176 if (h == NULL
1177 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
1178 return FALSE;
1179 else if (largepic)
1180 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64;
1181 else if (indirect_call)
1182 return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_GOTPCRELX;
1183 else
1184 return (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
1185 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
1186
1187 case R_X86_64_GOTTPOFF:
1188 /* Check transition from IE access model:
1189 mov foo@gottpoff(%rip), %reg
1190 add foo@gottpoff(%rip), %reg
1191 */
1192
1193 /* Check REX prefix first. */
1194 if (offset >= 3 && (offset + 4) <= sec->size)
1195 {
1196 val = bfd_get_8 (abfd, contents + offset - 3);
1197 if (val != 0x48 && val != 0x4c)
1198 {
1199 /* X32 may have 0x44 REX prefix or no REX prefix. */
1200 if (ABI_64_P (abfd))
1201 return FALSE;
1202 }
1203 }
1204 else
1205 {
1206 /* X32 may not have any REX prefix. */
1207 if (ABI_64_P (abfd))
1208 return FALSE;
1209 if (offset < 2 || (offset + 3) > sec->size)
1210 return FALSE;
1211 }
1212
1213 val = bfd_get_8 (abfd, contents + offset - 2);
1214 if (val != 0x8b && val != 0x03)
1215 return FALSE;
1216
1217 val = bfd_get_8 (abfd, contents + offset - 1);
1218 return (val & 0xc7) == 5;
1219
1220 case R_X86_64_GOTPC32_TLSDESC:
1221 /* Check transition from GDesc access model:
1222 leaq x@tlsdesc(%rip), %rax
1223
1224 Make sure it's a leaq adding rip to a 32-bit offset
1225 into any register, although it's probably almost always
1226 going to be rax. */
1227
1228 if (offset < 3 || (offset + 4) > sec->size)
1229 return FALSE;
1230
1231 val = bfd_get_8 (abfd, contents + offset - 3);
1232 if ((val & 0xfb) != 0x48)
1233 return FALSE;
1234
1235 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1236 return FALSE;
1237
1238 val = bfd_get_8 (abfd, contents + offset - 1);
1239 return (val & 0xc7) == 0x05;
1240
1241 case R_X86_64_TLSDESC_CALL:
1242 /* Check transition from GDesc access model:
1243 call *x@tlsdesc(%rax)
1244 */
1245 if (offset + 2 <= sec->size)
1246 {
1247 /* Make sure that it's a call *x@tlsdesc(%rax). */
1248 call = contents + offset;
1249 return call[0] == 0xff && call[1] == 0x10;
1250 }
1251
1252 return FALSE;
1253
1254 default:
1255 abort ();
1256 }
1257 }
1258
1259 /* Return TRUE if the TLS access transition is OK or no transition
1260 will be performed. Update R_TYPE if there is a transition. */
1261
1262 static bfd_boolean
1263 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
1264 asection *sec, bfd_byte *contents,
1265 Elf_Internal_Shdr *symtab_hdr,
1266 struct elf_link_hash_entry **sym_hashes,
1267 unsigned int *r_type, int tls_type,
1268 const Elf_Internal_Rela *rel,
1269 const Elf_Internal_Rela *relend,
1270 struct elf_link_hash_entry *h,
1271 unsigned long r_symndx,
1272 bfd_boolean from_relocate_section)
1273 {
1274 unsigned int from_type = *r_type;
1275 unsigned int to_type = from_type;
1276 bfd_boolean check = TRUE;
1277
1278 /* Skip TLS transition for functions. */
1279 if (h != NULL
1280 && (h->type == STT_FUNC
1281 || h->type == STT_GNU_IFUNC))
1282 return TRUE;
1283
1284 switch (from_type)
1285 {
1286 case R_X86_64_TLSGD:
1287 case R_X86_64_GOTPC32_TLSDESC:
1288 case R_X86_64_TLSDESC_CALL:
1289 case R_X86_64_GOTTPOFF:
1290 if (bfd_link_executable (info))
1291 {
1292 if (h == NULL)
1293 to_type = R_X86_64_TPOFF32;
1294 else
1295 to_type = R_X86_64_GOTTPOFF;
1296 }
1297
1298 /* When we are called from elf_x86_64_relocate_section, there may
1299 be additional transitions based on TLS_TYPE. */
1300 if (from_relocate_section)
1301 {
1302 unsigned int new_to_type = to_type;
1303
1304 if (bfd_link_executable (info)
1305 && h != NULL
1306 && h->dynindx == -1
1307 && tls_type == GOT_TLS_IE)
1308 new_to_type = R_X86_64_TPOFF32;
1309
1310 if (to_type == R_X86_64_TLSGD
1311 || to_type == R_X86_64_GOTPC32_TLSDESC
1312 || to_type == R_X86_64_TLSDESC_CALL)
1313 {
1314 if (tls_type == GOT_TLS_IE)
1315 new_to_type = R_X86_64_GOTTPOFF;
1316 }
1317
1318 /* We checked the transition before when we were called from
1319 elf_x86_64_check_relocs. We only want to check the new
1320 transition which hasn't been checked before. */
1321 check = new_to_type != to_type && from_type == to_type;
1322 to_type = new_to_type;
1323 }
1324
1325 break;
1326
1327 case R_X86_64_TLSLD:
1328 if (bfd_link_executable (info))
1329 to_type = R_X86_64_TPOFF32;
1330 break;
1331
1332 default:
1333 return TRUE;
1334 }
1335
1336 /* Return TRUE if there is no transition. */
1337 if (from_type == to_type)
1338 return TRUE;
1339
1340 /* Check if the transition can be performed. */
1341 if (check
1342 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1343 symtab_hdr, sym_hashes,
1344 from_type, rel, relend))
1345 {
1346 reloc_howto_type *from, *to;
1347 const char *name;
1348
1349 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1350 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1351
1352 if (h)
1353 name = h->root.root.string;
1354 else
1355 {
1356 struct elf_x86_link_hash_table *htab;
1357
1358 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1359 if (htab == NULL)
1360 name = "*unknown*";
1361 else
1362 {
1363 Elf_Internal_Sym *isym;
1364
1365 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1366 abfd, r_symndx);
1367 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1368 }
1369 }
1370
1371 _bfd_error_handler
1372 /* xgettext:c-format */
1373 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1374 "in section `%A' failed"),
1375 abfd, from->name, to->name, name, rel->r_offset, sec);
1376 bfd_set_error (bfd_error_bad_value);
1377 return FALSE;
1378 }
1379
1380 *r_type = to_type;
1381 return TRUE;
1382 }
1383
1384 /* Rename some of the generic section flags to better document how they
1385 are used here. */
1386 #define need_convert_load sec_flg0
1387 #define check_relocs_failed sec_flg1
1388
1389 static bfd_boolean
1390 elf_x86_64_need_pic (struct bfd_link_info *info,
1391 bfd *input_bfd, asection *sec,
1392 struct elf_link_hash_entry *h,
1393 Elf_Internal_Shdr *symtab_hdr,
1394 Elf_Internal_Sym *isym,
1395 reloc_howto_type *howto)
1396 {
1397 const char *v = "";
1398 const char *und = "";
1399 const char *pic = "";
1400 const char *object;
1401
1402 const char *name;
1403 if (h)
1404 {
1405 name = h->root.root.string;
1406 switch (ELF_ST_VISIBILITY (h->other))
1407 {
1408 case STV_HIDDEN:
1409 v = _("hidden symbol ");
1410 break;
1411 case STV_INTERNAL:
1412 v = _("internal symbol ");
1413 break;
1414 case STV_PROTECTED:
1415 v = _("protected symbol ");
1416 break;
1417 default:
1418 if (((struct elf_x86_link_hash_entry *) h)->def_protected)
1419 v = _("protected symbol ");
1420 else
1421 v = _("symbol ");
1422 pic = _("; recompile with -fPIC");
1423 break;
1424 }
1425
1426 if (!h->def_regular && !h->def_dynamic)
1427 und = _("undefined ");
1428 }
1429 else
1430 {
1431 name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL);
1432 pic = _("; recompile with -fPIC");
1433 }
1434
1435 if (bfd_link_dll (info))
1436 object = _("a shared object");
1437 else if (bfd_link_pie (info))
1438 object = _("a PIE object");
1439 else
1440 object = _("a PDE object");
1441
1442 /* xgettext:c-format */
1443 _bfd_error_handler (_("%B: relocation %s against %s%s`%s' can "
1444 "not be used when making %s%s"),
1445 input_bfd, howto->name, und, v, name,
1446 object, pic);
1447 bfd_set_error (bfd_error_bad_value);
1448 sec->check_relocs_failed = 1;
1449 return FALSE;
1450 }
1451
1452 /* With the local symbol, foo, we convert
1453 mov foo@GOTPCREL(%rip), %reg
1454 to
1455 lea foo(%rip), %reg
1456 and convert
1457 call/jmp *foo@GOTPCREL(%rip)
1458 to
1459 nop call foo/jmp foo nop
1460 When PIC is false, convert
1461 test %reg, foo@GOTPCREL(%rip)
1462 to
1463 test $foo, %reg
1464 and convert
1465 binop foo@GOTPCREL(%rip), %reg
1466 to
1467 binop $foo, %reg
1468 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1469 instructions. */
1470
1471 static bfd_boolean
1472 elf_x86_64_convert_load_reloc (bfd *abfd, asection *sec,
1473 bfd_byte *contents,
1474 Elf_Internal_Rela *irel,
1475 struct elf_link_hash_entry *h,
1476 bfd_boolean *converted,
1477 struct bfd_link_info *link_info)
1478 {
1479 struct elf_x86_link_hash_table *htab;
1480 bfd_boolean is_pic;
1481 bfd_boolean require_reloc_pc32;
1482 bfd_boolean relocx;
1483 bfd_boolean to_reloc_pc32;
1484 asection *tsec;
1485 char symtype;
1486 bfd_signed_vma raddend;
1487 unsigned int opcode;
1488 unsigned int modrm;
1489 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
1490 unsigned int r_symndx;
1491 bfd_vma toff;
1492 bfd_vma roff = irel->r_offset;
1493
1494 if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
1495 return TRUE;
1496
1497 raddend = irel->r_addend;
1498 /* Addend for 32-bit PC-relative relocation must be -4. */
1499 if (raddend != -4)
1500 return TRUE;
1501
1502 htab = elf_x86_hash_table (link_info, X86_64_ELF_DATA);
1503 is_pic = bfd_link_pic (link_info);
1504
1505 relocx = (r_type == R_X86_64_GOTPCRELX
1506 || r_type == R_X86_64_REX_GOTPCRELX);
1507
1508 /* TRUE if we can convert only to R_X86_64_PC32. Enable it for
1509 --no-relax. */
1510 require_reloc_pc32
1511 = link_info->disable_target_specific_optimizations > 1;
1512
1513 r_symndx = htab->r_sym (irel->r_info);
1514
1515 opcode = bfd_get_8 (abfd, contents + roff - 2);
1516
1517 /* Convert mov to lea since it has been done for a while. */
1518 if (opcode != 0x8b)
1519 {
1520 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
1521 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
1522 test, xor instructions. */
1523 if (!relocx)
1524 return TRUE;
1525 }
1526
1527 /* We convert only to R_X86_64_PC32:
1528 1. Branch.
1529 2. R_X86_64_GOTPCREL since we can't modify REX byte.
1530 3. require_reloc_pc32 is true.
1531 4. PIC.
1532 */
1533 to_reloc_pc32 = (opcode == 0xff
1534 || !relocx
1535 || require_reloc_pc32
1536 || is_pic);
1537
1538 /* Get the symbol referred to by the reloc. */
1539 if (h == NULL)
1540 {
1541 Elf_Internal_Sym *isym
1542 = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx);
1543
1544 /* Skip relocation against undefined symbols. */
1545 if (isym->st_shndx == SHN_UNDEF)
1546 return TRUE;
1547
1548 symtype = ELF_ST_TYPE (isym->st_info);
1549
1550 if (isym->st_shndx == SHN_ABS)
1551 tsec = bfd_abs_section_ptr;
1552 else if (isym->st_shndx == SHN_COMMON)
1553 tsec = bfd_com_section_ptr;
1554 else if (isym->st_shndx == SHN_X86_64_LCOMMON)
1555 tsec = &_bfd_elf_large_com_section;
1556 else
1557 tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
1558
1559 toff = isym->st_value;
1560 }
1561 else
1562 {
1563 /* Undefined weak symbol is only bound locally in executable
1564 and its reference is resolved as 0 without relocation
1565 overflow. We can only perform this optimization for
1566 GOTPCRELX relocations since we need to modify REX byte.
1567 It is OK convert mov with R_X86_64_GOTPCREL to
1568 R_X86_64_PC32. */
1569 if ((relocx || opcode == 0x8b)
1570 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info,
1571 X86_64_ELF_DATA,
1572 TRUE,
1573 elf_x86_hash_entry (h)))
1574 {
1575 if (opcode == 0xff)
1576 {
1577 /* Skip for branch instructions since R_X86_64_PC32
1578 may overflow. */
1579 if (require_reloc_pc32)
1580 return TRUE;
1581 }
1582 else if (relocx)
1583 {
1584 /* For non-branch instructions, we can convert to
1585 R_X86_64_32/R_X86_64_32S since we know if there
1586 is a REX byte. */
1587 to_reloc_pc32 = FALSE;
1588 }
1589
1590 /* Since we don't know the current PC when PIC is true,
1591 we can't convert to R_X86_64_PC32. */
1592 if (to_reloc_pc32 && is_pic)
1593 return TRUE;
1594
1595 goto convert;
1596 }
1597 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
1598 ld.so may use its link-time address. */
1599 else if (h->start_stop
1600 || ((h->def_regular
1601 || h->root.type == bfd_link_hash_defined
1602 || h->root.type == bfd_link_hash_defweak)
1603 && h != htab->elf.hdynamic
1604 && SYMBOL_REFERENCES_LOCAL (link_info, h)))
1605 {
1606 /* bfd_link_hash_new or bfd_link_hash_undefined is
1607 set by an assignment in a linker script in
1608 bfd_elf_record_link_assignment. start_stop is set
1609 on __start_SECNAME/__stop_SECNAME which mark section
1610 SECNAME. */
1611 if (h->start_stop
1612 || (h->def_regular
1613 && (h->root.type == bfd_link_hash_new
1614 || h->root.type == bfd_link_hash_undefined
1615 || ((h->root.type == bfd_link_hash_defined
1616 || h->root.type == bfd_link_hash_defweak)
1617 && h->root.u.def.section == bfd_und_section_ptr))))
1618 {
1619 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
1620 if (require_reloc_pc32)
1621 return TRUE;
1622 goto convert;
1623 }
1624 tsec = h->root.u.def.section;
1625 toff = h->root.u.def.value;
1626 symtype = h->type;
1627 }
1628 else
1629 return TRUE;
1630 }
1631
1632 /* Don't convert GOTPCREL relocation against large section. */
1633 if (elf_section_data (tsec) != NULL
1634 && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0)
1635 return TRUE;
1636
1637 /* We can only estimate relocation overflow for R_X86_64_PC32. */
1638 if (!to_reloc_pc32)
1639 goto convert;
1640
1641 if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
1642 {
1643 /* At this stage in linking, no SEC_MERGE symbol has been
1644 adjusted, so all references to such symbols need to be
1645 passed through _bfd_merged_section_offset. (Later, in
1646 relocate_section, all SEC_MERGE symbols *except* for
1647 section symbols have been adjusted.)
1648
1649 gas may reduce relocations against symbols in SEC_MERGE
1650 sections to a relocation against the section symbol when
1651 the original addend was zero. When the reloc is against
1652 a section symbol we should include the addend in the
1653 offset passed to _bfd_merged_section_offset, since the
1654 location of interest is the original symbol. On the
1655 other hand, an access to "sym+addend" where "sym" is not
1656 a section symbol should not include the addend; Such an
1657 access is presumed to be an offset from "sym"; The
1658 location of interest is just "sym". */
1659 if (symtype == STT_SECTION)
1660 toff += raddend;
1661
1662 toff = _bfd_merged_section_offset (abfd, &tsec,
1663 elf_section_data (tsec)->sec_info,
1664 toff);
1665
1666 if (symtype != STT_SECTION)
1667 toff += raddend;
1668 }
1669 else
1670 toff += raddend;
1671
1672 /* Don't convert if R_X86_64_PC32 relocation overflows. */
1673 if (tsec->output_section == sec->output_section)
1674 {
1675 if ((toff - roff + 0x80000000) > 0xffffffff)
1676 return TRUE;
1677 }
1678 else
1679 {
1680 bfd_signed_vma distance;
1681
1682 /* At this point, we don't know the load addresses of TSEC
1683 section nor SEC section. We estimate the distrance between
1684 SEC and TSEC. We store the estimated distances in the
1685 compressed_size field of the output section, which is only
1686 used to decompress the compressed input section. */
1687 if (sec->output_section->compressed_size == 0)
1688 {
1689 asection *asect;
1690 bfd_size_type size = 0;
1691 for (asect = link_info->output_bfd->sections;
1692 asect != NULL;
1693 asect = asect->next)
1694 /* Skip debug sections since compressed_size is used to
1695 compress debug sections. */
1696 if ((asect->flags & SEC_DEBUGGING) == 0)
1697 {
1698 asection *i;
1699 for (i = asect->map_head.s;
1700 i != NULL;
1701 i = i->map_head.s)
1702 {
1703 size = align_power (size, i->alignment_power);
1704 size += i->size;
1705 }
1706 asect->compressed_size = size;
1707 }
1708 }
1709
1710 /* Don't convert GOTPCREL relocations if TSEC isn't placed
1711 after SEC. */
1712 distance = (tsec->output_section->compressed_size
1713 - sec->output_section->compressed_size);
1714 if (distance < 0)
1715 return TRUE;
1716
1717 /* Take PT_GNU_RELRO segment into account by adding
1718 maxpagesize. */
1719 if ((toff + distance + get_elf_backend_data (abfd)->maxpagesize
1720 - roff + 0x80000000) > 0xffffffff)
1721 return TRUE;
1722 }
1723
1724 convert:
1725 if (opcode == 0xff)
1726 {
1727 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
1728 unsigned int nop;
1729 unsigned int disp;
1730 bfd_vma nop_offset;
1731
1732 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
1733 R_X86_64_PC32. */
1734 modrm = bfd_get_8 (abfd, contents + roff - 1);
1735 if (modrm == 0x25)
1736 {
1737 /* Convert to "jmp foo nop". */
1738 modrm = 0xe9;
1739 nop = NOP_OPCODE;
1740 nop_offset = irel->r_offset + 3;
1741 disp = bfd_get_32 (abfd, contents + irel->r_offset);
1742 irel->r_offset -= 1;
1743 bfd_put_32 (abfd, disp, contents + irel->r_offset);
1744 }
1745 else
1746 {
1747 struct elf_x86_link_hash_entry *eh
1748 = (struct elf_x86_link_hash_entry *) h;
1749
1750 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1751 is a nop prefix. */
1752 modrm = 0xe8;
1753 /* To support TLS optimization, always use addr32 prefix for
1754 "call *__tls_get_addr@GOTPCREL(%rip)". */
1755 if (eh && eh->tls_get_addr)
1756 {
1757 nop = 0x67;
1758 nop_offset = irel->r_offset - 2;
1759 }
1760 else
1761 {
1762 nop = link_info->call_nop_byte;
1763 if (link_info->call_nop_as_suffix)
1764 {
1765 nop_offset = irel->r_offset + 3;
1766 disp = bfd_get_32 (abfd, contents + irel->r_offset);
1767 irel->r_offset -= 1;
1768 bfd_put_32 (abfd, disp, contents + irel->r_offset);
1769 }
1770 else
1771 nop_offset = irel->r_offset - 2;
1772 }
1773 }
1774 bfd_put_8 (abfd, nop, contents + nop_offset);
1775 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1776 r_type = R_X86_64_PC32;
1777 }
1778 else
1779 {
1780 unsigned int rex;
1781 unsigned int rex_mask = REX_R;
1782
1783 if (r_type == R_X86_64_REX_GOTPCRELX)
1784 rex = bfd_get_8 (abfd, contents + roff - 3);
1785 else
1786 rex = 0;
1787
1788 if (opcode == 0x8b)
1789 {
1790 if (to_reloc_pc32)
1791 {
1792 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1793 "lea foo(%rip), %reg". */
1794 opcode = 0x8d;
1795 r_type = R_X86_64_PC32;
1796 }
1797 else
1798 {
1799 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1800 "mov $foo, %reg". */
1801 opcode = 0xc7;
1802 modrm = bfd_get_8 (abfd, contents + roff - 1);
1803 modrm = 0xc0 | (modrm & 0x38) >> 3;
1804 if ((rex & REX_W) != 0
1805 && ABI_64_P (link_info->output_bfd))
1806 {
1807 /* Keep the REX_W bit in REX byte for LP64. */
1808 r_type = R_X86_64_32S;
1809 goto rewrite_modrm_rex;
1810 }
1811 else
1812 {
1813 /* If the REX_W bit in REX byte isn't needed,
1814 use R_X86_64_32 and clear the W bit to avoid
1815 sign-extend imm32 to imm64. */
1816 r_type = R_X86_64_32;
1817 /* Clear the W bit in REX byte. */
1818 rex_mask |= REX_W;
1819 goto rewrite_modrm_rex;
1820 }
1821 }
1822 }
1823 else
1824 {
1825 /* R_X86_64_PC32 isn't supported. */
1826 if (to_reloc_pc32)
1827 return TRUE;
1828
1829 modrm = bfd_get_8 (abfd, contents + roff - 1);
1830 if (opcode == 0x85)
1831 {
1832 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
1833 "test $foo, %reg". */
1834 modrm = 0xc0 | (modrm & 0x38) >> 3;
1835 opcode = 0xf7;
1836 }
1837 else
1838 {
1839 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
1840 "binop $foo, %reg". */
1841 modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
1842 opcode = 0x81;
1843 }
1844
1845 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
1846 overflow when sign-extending imm32 to imm64. */
1847 r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32;
1848
1849 rewrite_modrm_rex:
1850 bfd_put_8 (abfd, modrm, contents + roff - 1);
1851
1852 if (rex)
1853 {
1854 /* Move the R bit to the B bit in REX byte. */
1855 rex = (rex & ~rex_mask) | (rex & REX_R) >> 2;
1856 bfd_put_8 (abfd, rex, contents + roff - 3);
1857 }
1858
1859 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
1860 irel->r_addend = 0;
1861 }
1862
1863 bfd_put_8 (abfd, opcode, contents + roff - 2);
1864 }
1865
1866 irel->r_info = htab->r_info (r_symndx, r_type);
1867
1868 *converted = TRUE;
1869
1870 return TRUE;
1871 }
1872
1873 /* Look through the relocs for a section during the first phase, and
1874 calculate needed space in the global offset table, procedure
1875 linkage table, and dynamic reloc sections. */
1876
1877 static bfd_boolean
1878 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1879 asection *sec,
1880 const Elf_Internal_Rela *relocs)
1881 {
1882 struct elf_x86_link_hash_table *htab;
1883 Elf_Internal_Shdr *symtab_hdr;
1884 struct elf_link_hash_entry **sym_hashes;
1885 const Elf_Internal_Rela *rel;
1886 const Elf_Internal_Rela *rel_end;
1887 asection *sreloc;
1888 bfd_byte *contents;
1889
1890 if (bfd_link_relocatable (info))
1891 return TRUE;
1892
1893 /* Don't do anything special with non-loaded, non-alloced sections.
1894 In particular, any relocs in such sections should not affect GOT
1895 and PLT reference counting (ie. we don't allow them to create GOT
1896 or PLT entries), there's no possibility or desire to optimize TLS
1897 relocs, and there's not much point in propagating relocs to shared
1898 libs that the dynamic linker won't relocate. */
1899 if ((sec->flags & SEC_ALLOC) == 0)
1900 return TRUE;
1901
1902 BFD_ASSERT (is_x86_64_elf (abfd));
1903
1904 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
1905 if (htab == NULL)
1906 {
1907 sec->check_relocs_failed = 1;
1908 return FALSE;
1909 }
1910
1911 /* Get the section contents. */
1912 if (elf_section_data (sec)->this_hdr.contents != NULL)
1913 contents = elf_section_data (sec)->this_hdr.contents;
1914 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1915 {
1916 sec->check_relocs_failed = 1;
1917 return FALSE;
1918 }
1919
1920 symtab_hdr = &elf_symtab_hdr (abfd);
1921 sym_hashes = elf_sym_hashes (abfd);
1922
1923 sreloc = NULL;
1924
1925 rel_end = relocs + sec->reloc_count;
1926 for (rel = relocs; rel < rel_end; rel++)
1927 {
1928 unsigned int r_type;
1929 unsigned int r_symndx;
1930 struct elf_link_hash_entry *h;
1931 struct elf_x86_link_hash_entry *eh;
1932 Elf_Internal_Sym *isym;
1933 const char *name;
1934 bfd_boolean size_reloc;
1935
1936 r_symndx = htab->r_sym (rel->r_info);
1937 r_type = ELF32_R_TYPE (rel->r_info);
1938
1939 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1940 {
1941 /* xgettext:c-format */
1942 _bfd_error_handler (_("%B: bad symbol index: %d"),
1943 abfd, r_symndx);
1944 goto error_return;
1945 }
1946
1947 if (r_symndx < symtab_hdr->sh_info)
1948 {
1949 /* A local symbol. */
1950 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1951 abfd, r_symndx);
1952 if (isym == NULL)
1953 goto error_return;
1954
1955 /* Check relocation against local STT_GNU_IFUNC symbol. */
1956 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1957 {
1958 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel,
1959 TRUE);
1960 if (h == NULL)
1961 goto error_return;
1962
1963 /* Fake a STT_GNU_IFUNC symbol. */
1964 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1965 isym, NULL);
1966 h->type = STT_GNU_IFUNC;
1967 h->def_regular = 1;
1968 h->ref_regular = 1;
1969 h->forced_local = 1;
1970 h->root.type = bfd_link_hash_defined;
1971 }
1972 else
1973 h = NULL;
1974 }
1975 else
1976 {
1977 isym = NULL;
1978 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1979 while (h->root.type == bfd_link_hash_indirect
1980 || h->root.type == bfd_link_hash_warning)
1981 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1982 }
1983
1984 /* Check invalid x32 relocations. */
1985 if (!ABI_64_P (abfd))
1986 switch (r_type)
1987 {
1988 default:
1989 break;
1990
1991 case R_X86_64_DTPOFF64:
1992 case R_X86_64_TPOFF64:
1993 case R_X86_64_PC64:
1994 case R_X86_64_GOTOFF64:
1995 case R_X86_64_GOT64:
1996 case R_X86_64_GOTPCREL64:
1997 case R_X86_64_GOTPC64:
1998 case R_X86_64_GOTPLT64:
1999 case R_X86_64_PLTOFF64:
2000 {
2001 if (h)
2002 name = h->root.root.string;
2003 else
2004 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2005 NULL);
2006 _bfd_error_handler
2007 /* xgettext:c-format */
2008 (_("%B: relocation %s against symbol `%s' isn't "
2009 "supported in x32 mode"), abfd,
2010 x86_64_elf_howto_table[r_type].name, name);
2011 bfd_set_error (bfd_error_bad_value);
2012 goto error_return;
2013 }
2014 break;
2015 }
2016
2017 if (h != NULL)
2018 {
2019 /* It is referenced by a non-shared object. */
2020 h->ref_regular = 1;
2021 h->root.non_ir_ref_regular = 1;
2022
2023 if (h->type == STT_GNU_IFUNC)
2024 elf_tdata (info->output_bfd)->has_gnu_symbols
2025 |= elf_gnu_symbol_ifunc;
2026 }
2027
2028 if (! elf_x86_64_tls_transition (info, abfd, sec, contents,
2029 symtab_hdr, sym_hashes,
2030 &r_type, GOT_UNKNOWN,
2031 rel, rel_end, h, r_symndx, FALSE))
2032 goto error_return;
2033
2034 eh = (struct elf_x86_link_hash_entry *) h;
2035 switch (r_type)
2036 {
2037 case R_X86_64_TLSLD:
2038 htab->tls_ld_or_ldm_got.refcount += 1;
2039 goto create_got;
2040
2041 case R_X86_64_TPOFF32:
2042 if (!bfd_link_executable (info) && ABI_64_P (abfd))
2043 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
2044 &x86_64_elf_howto_table[r_type]);
2045 if (eh != NULL)
2046 eh->has_got_reloc = 1;
2047 break;
2048
2049 case R_X86_64_GOTTPOFF:
2050 if (!bfd_link_executable (info))
2051 info->flags |= DF_STATIC_TLS;
2052 /* Fall through */
2053
2054 case R_X86_64_GOT32:
2055 case R_X86_64_GOTPCREL:
2056 case R_X86_64_GOTPCRELX:
2057 case R_X86_64_REX_GOTPCRELX:
2058 case R_X86_64_TLSGD:
2059 case R_X86_64_GOT64:
2060 case R_X86_64_GOTPCREL64:
2061 case R_X86_64_GOTPLT64:
2062 case R_X86_64_GOTPC32_TLSDESC:
2063 case R_X86_64_TLSDESC_CALL:
2064 /* This symbol requires a global offset table entry. */
2065 {
2066 int tls_type, old_tls_type;
2067
2068 switch (r_type)
2069 {
2070 default: tls_type = GOT_NORMAL; break;
2071 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
2072 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
2073 case R_X86_64_GOTPC32_TLSDESC:
2074 case R_X86_64_TLSDESC_CALL:
2075 tls_type = GOT_TLS_GDESC; break;
2076 }
2077
2078 if (h != NULL)
2079 {
2080 h->got.refcount += 1;
2081 old_tls_type = eh->tls_type;
2082 }
2083 else
2084 {
2085 bfd_signed_vma *local_got_refcounts;
2086
2087 /* This is a global offset table entry for a local symbol. */
2088 local_got_refcounts = elf_local_got_refcounts (abfd);
2089 if (local_got_refcounts == NULL)
2090 {
2091 bfd_size_type size;
2092
2093 size = symtab_hdr->sh_info;
2094 size *= sizeof (bfd_signed_vma)
2095 + sizeof (bfd_vma) + sizeof (char);
2096 local_got_refcounts = ((bfd_signed_vma *)
2097 bfd_zalloc (abfd, size));
2098 if (local_got_refcounts == NULL)
2099 goto error_return;
2100 elf_local_got_refcounts (abfd) = local_got_refcounts;
2101 elf_x86_local_tlsdesc_gotent (abfd)
2102 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2103 elf_x86_local_got_tls_type (abfd)
2104 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2105 }
2106 local_got_refcounts[r_symndx] += 1;
2107 old_tls_type
2108 = elf_x86_local_got_tls_type (abfd) [r_symndx];
2109 }
2110
2111 /* If a TLS symbol is accessed using IE at least once,
2112 there is no point to use dynamic model for it. */
2113 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2114 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2115 || tls_type != GOT_TLS_IE))
2116 {
2117 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
2118 tls_type = old_tls_type;
2119 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2120 && GOT_TLS_GD_ANY_P (tls_type))
2121 tls_type |= old_tls_type;
2122 else
2123 {
2124 if (h)
2125 name = h->root.root.string;
2126 else
2127 name = bfd_elf_sym_name (abfd, symtab_hdr,
2128 isym, NULL);
2129 _bfd_error_handler
2130 /* xgettext:c-format */
2131 (_("%B: '%s' accessed both as normal and"
2132 " thread local symbol"),
2133 abfd, name);
2134 bfd_set_error (bfd_error_bad_value);
2135 goto error_return;
2136 }
2137 }
2138
2139 if (old_tls_type != tls_type)
2140 {
2141 if (eh != NULL)
2142 eh->tls_type = tls_type;
2143 else
2144 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
2145 }
2146 }
2147 /* Fall through */
2148
2149 case R_X86_64_GOTOFF64:
2150 case R_X86_64_GOTPC32:
2151 case R_X86_64_GOTPC64:
2152 create_got:
2153 if (eh != NULL)
2154 eh->has_got_reloc = 1;
2155 break;
2156
2157 case R_X86_64_PLT32:
2158 case R_X86_64_PLT32_BND:
2159 /* This symbol requires a procedure linkage table entry. We
2160 actually build the entry in adjust_dynamic_symbol,
2161 because this might be a case of linking PIC code which is
2162 never referenced by a dynamic object, in which case we
2163 don't need to generate a procedure linkage table entry
2164 after all. */
2165
2166 /* If this is a local symbol, we resolve it directly without
2167 creating a procedure linkage table entry. */
2168 if (h == NULL)
2169 continue;
2170
2171 eh->has_got_reloc = 1;
2172 h->needs_plt = 1;
2173 h->plt.refcount += 1;
2174 break;
2175
2176 case R_X86_64_PLTOFF64:
2177 /* This tries to form the 'address' of a function relative
2178 to GOT. For global symbols we need a PLT entry. */
2179 if (h != NULL)
2180 {
2181 h->needs_plt = 1;
2182 h->plt.refcount += 1;
2183 }
2184 goto create_got;
2185
2186 case R_X86_64_SIZE32:
2187 case R_X86_64_SIZE64:
2188 size_reloc = TRUE;
2189 goto do_size;
2190
2191 case R_X86_64_32:
2192 if (!ABI_64_P (abfd))
2193 goto pointer;
2194 /* Fall through. */
2195 case R_X86_64_8:
2196 case R_X86_64_16:
2197 case R_X86_64_32S:
2198 /* Check relocation overflow as these relocs may lead to
2199 run-time relocation overflow. Don't error out for
2200 sections we don't care about, such as debug sections or
2201 when relocation overflow check is disabled. */
2202 if (!info->no_reloc_overflow_check
2203 && (bfd_link_pic (info)
2204 || (bfd_link_executable (info)
2205 && h != NULL
2206 && !h->def_regular
2207 && h->def_dynamic
2208 && (sec->flags & SEC_READONLY) == 0)))
2209 return elf_x86_64_need_pic (info, abfd, sec, h, symtab_hdr, isym,
2210 &x86_64_elf_howto_table[r_type]);
2211 /* Fall through. */
2212
2213 case R_X86_64_PC8:
2214 case R_X86_64_PC16:
2215 case R_X86_64_PC32:
2216 case R_X86_64_PC32_BND:
2217 case R_X86_64_PC64:
2218 case R_X86_64_64:
2219 pointer:
2220 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2221 eh->has_non_got_reloc = 1;
2222 /* We are called after all symbols have been resolved. Only
2223 relocation against STT_GNU_IFUNC symbol must go through
2224 PLT. */
2225 if (h != NULL
2226 && (bfd_link_executable (info)
2227 || h->type == STT_GNU_IFUNC))
2228 {
2229 /* If this reloc is in a read-only section, we might
2230 need a copy reloc. We can't check reliably at this
2231 stage whether the section is read-only, as input
2232 sections have not yet been mapped to output sections.
2233 Tentatively set the flag for now, and correct in
2234 adjust_dynamic_symbol. */
2235 h->non_got_ref = 1;
2236
2237 /* We may need a .plt entry if the symbol is a function
2238 defined in a shared lib or is a STT_GNU_IFUNC function
2239 referenced from the code or read-only section. */
2240 if (!h->def_regular
2241 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2242 h->plt.refcount += 1;
2243
2244 if (r_type == R_X86_64_PC32)
2245 {
2246 /* Since something like ".long foo - ." may be used
2247 as pointer, make sure that PLT is used if foo is
2248 a function defined in a shared library. */
2249 if ((sec->flags & SEC_CODE) == 0)
2250 h->pointer_equality_needed = 1;
2251 }
2252 else if (r_type != R_X86_64_PC32_BND
2253 && r_type != R_X86_64_PC64)
2254 {
2255 h->pointer_equality_needed = 1;
2256 /* At run-time, R_X86_64_64 can be resolved for both
2257 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2258 can only be resolved for x32. */
2259 if ((sec->flags & SEC_READONLY) == 0
2260 && (r_type == R_X86_64_64
2261 || (!ABI_64_P (abfd)
2262 && (r_type == R_X86_64_32
2263 || r_type == R_X86_64_32S))))
2264 eh->func_pointer_refcount += 1;
2265 }
2266 }
2267
2268 size_reloc = FALSE;
2269 do_size:
2270 /* If we are creating a shared library, and this is a reloc
2271 against a global symbol, or a non PC relative reloc
2272 against a local symbol, then we need to copy the reloc
2273 into the shared library. However, if we are linking with
2274 -Bsymbolic, we do not need to copy a reloc against a
2275 global symbol which is defined in an object we are
2276 including in the link (i.e., DEF_REGULAR is set). At
2277 this point we have not seen all the input files, so it is
2278 possible that DEF_REGULAR is not set now but will be set
2279 later (it is never cleared). In case of a weak definition,
2280 DEF_REGULAR may be cleared later by a strong definition in
2281 a shared library. We account for that possibility below by
2282 storing information in the relocs_copied field of the hash
2283 table entry. A similar situation occurs when creating
2284 shared libraries and symbol visibility changes render the
2285 symbol local.
2286
2287 If on the other hand, we are creating an executable, we
2288 may need to keep relocations for symbols satisfied by a
2289 dynamic library if we manage to avoid copy relocs for the
2290 symbol.
2291
2292 Generate dynamic pointer relocation against STT_GNU_IFUNC
2293 symbol in the non-code section. */
2294 if ((bfd_link_pic (info)
2295 && (! IS_X86_64_PCREL_TYPE (r_type)
2296 || (h != NULL
2297 && (! (bfd_link_pie (info)
2298 || SYMBOLIC_BIND (info, h))
2299 || h->root.type == bfd_link_hash_defweak
2300 || !h->def_regular))))
2301 || (h != NULL
2302 && h->type == STT_GNU_IFUNC
2303 && r_type == htab->pointer_r_type
2304 && (sec->flags & SEC_CODE) == 0)
2305 || (ELIMINATE_COPY_RELOCS
2306 && !bfd_link_pic (info)
2307 && h != NULL
2308 && (h->root.type == bfd_link_hash_defweak
2309 || !h->def_regular)))
2310 {
2311 struct elf_dyn_relocs *p;
2312 struct elf_dyn_relocs **head;
2313
2314 /* We must copy these reloc types into the output file.
2315 Create a reloc section in dynobj and make room for
2316 this reloc. */
2317 if (sreloc == NULL)
2318 {
2319 sreloc = _bfd_elf_make_dynamic_reloc_section
2320 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
2321 abfd, /*rela?*/ TRUE);
2322
2323 if (sreloc == NULL)
2324 goto error_return;
2325 }
2326
2327 /* If this is a global symbol, we count the number of
2328 relocations we need for this symbol. */
2329 if (h != NULL)
2330 head = &eh->dyn_relocs;
2331 else
2332 {
2333 /* Track dynamic relocs needed for local syms too.
2334 We really need local syms available to do this
2335 easily. Oh well. */
2336 asection *s;
2337 void **vpp;
2338
2339 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2340 abfd, r_symndx);
2341 if (isym == NULL)
2342 goto error_return;
2343
2344 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2345 if (s == NULL)
2346 s = sec;
2347
2348 /* Beware of type punned pointers vs strict aliasing
2349 rules. */
2350 vpp = &(elf_section_data (s)->local_dynrel);
2351 head = (struct elf_dyn_relocs **)vpp;
2352 }
2353
2354 p = *head;
2355 if (p == NULL || p->sec != sec)
2356 {
2357 bfd_size_type amt = sizeof *p;
2358
2359 p = ((struct elf_dyn_relocs *)
2360 bfd_alloc (htab->elf.dynobj, amt));
2361 if (p == NULL)
2362 goto error_return;
2363 p->next = *head;
2364 *head = p;
2365 p->sec = sec;
2366 p->count = 0;
2367 p->pc_count = 0;
2368 }
2369
2370 p->count += 1;
2371 /* Count size relocation as PC-relative relocation. */
2372 if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
2373 p->pc_count += 1;
2374 }
2375 break;
2376
2377 /* This relocation describes the C++ object vtable hierarchy.
2378 Reconstruct it for later use during GC. */
2379 case R_X86_64_GNU_VTINHERIT:
2380 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2381 goto error_return;
2382 break;
2383
2384 /* This relocation describes which C++ vtable entries are actually
2385 used. Record for later use during GC. */
2386 case R_X86_64_GNU_VTENTRY:
2387 BFD_ASSERT (h != NULL);
2388 if (h != NULL
2389 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
2390 goto error_return;
2391 break;
2392
2393 default:
2394 break;
2395 }
2396
2397 if ((r_type == R_X86_64_GOTPCREL
2398 || r_type == R_X86_64_GOTPCRELX
2399 || r_type == R_X86_64_REX_GOTPCRELX)
2400 && (h == NULL || h->type != STT_GNU_IFUNC))
2401 sec->need_convert_load = 1;
2402 }
2403
2404 if (elf_section_data (sec)->this_hdr.contents != contents)
2405 {
2406 if (!info->keep_memory)
2407 free (contents);
2408 else
2409 {
2410 /* Cache the section contents for elf_link_input_bfd. */
2411 elf_section_data (sec)->this_hdr.contents = contents;
2412 }
2413 }
2414
2415 return TRUE;
2416
2417 error_return:
2418 if (elf_section_data (sec)->this_hdr.contents != contents)
2419 free (contents);
2420 sec->check_relocs_failed = 1;
2421 return FALSE;
2422 }
2423
2424 /* Return the section that should be marked against GC for a given
2425 relocation. */
2426
2427 static asection *
2428 elf_x86_64_gc_mark_hook (asection *sec,
2429 struct bfd_link_info *info,
2430 Elf_Internal_Rela *rel,
2431 struct elf_link_hash_entry *h,
2432 Elf_Internal_Sym *sym)
2433 {
2434 if (h != NULL)
2435 switch (ELF32_R_TYPE (rel->r_info))
2436 {
2437 case R_X86_64_GNU_VTINHERIT:
2438 case R_X86_64_GNU_VTENTRY:
2439 return NULL;
2440 }
2441
2442 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2443 }
2444
2445 /* Adjust a symbol defined by a dynamic object and referenced by a
2446 regular object. The current definition is in some section of the
2447 dynamic object, but we're not including those sections. We have to
2448 change the definition to something the rest of the link can
2449 understand. */
2450
2451 static bfd_boolean
2452 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
2453 struct elf_link_hash_entry *h)
2454 {
2455 struct elf_x86_link_hash_table *htab;
2456 asection *s, *srel;
2457 struct elf_x86_link_hash_entry *eh;
2458 struct elf_dyn_relocs *p;
2459
2460 /* STT_GNU_IFUNC symbol must go through PLT. */
2461 if (h->type == STT_GNU_IFUNC)
2462 {
2463 /* All local STT_GNU_IFUNC references must be treate as local
2464 calls via local PLT. */
2465 if (h->ref_regular
2466 && SYMBOL_CALLS_LOCAL (info, h))
2467 {
2468 bfd_size_type pc_count = 0, count = 0;
2469 struct elf_dyn_relocs **pp;
2470
2471 eh = (struct elf_x86_link_hash_entry *) h;
2472 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2473 {
2474 pc_count += p->pc_count;
2475 p->count -= p->pc_count;
2476 p->pc_count = 0;
2477 count += p->count;
2478 if (p->count == 0)
2479 *pp = p->next;
2480 else
2481 pp = &p->next;
2482 }
2483
2484 if (pc_count || count)
2485 {
2486 h->non_got_ref = 1;
2487 if (pc_count)
2488 {
2489 /* Increment PLT reference count only for PC-relative
2490 references. */
2491 h->needs_plt = 1;
2492 if (h->plt.refcount <= 0)
2493 h->plt.refcount = 1;
2494 else
2495 h->plt.refcount += 1;
2496 }
2497 }
2498 }
2499
2500 if (h->plt.refcount <= 0)
2501 {
2502 h->plt.offset = (bfd_vma) -1;
2503 h->needs_plt = 0;
2504 }
2505 return TRUE;
2506 }
2507
2508 /* If this is a function, put it in the procedure linkage table. We
2509 will fill in the contents of the procedure linkage table later,
2510 when we know the address of the .got section. */
2511 if (h->type == STT_FUNC
2512 || h->needs_plt)
2513 {
2514 if (h->plt.refcount <= 0
2515 || SYMBOL_CALLS_LOCAL (info, h)
2516 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2517 && h->root.type == bfd_link_hash_undefweak))
2518 {
2519 /* This case can occur if we saw a PLT32 reloc in an input
2520 file, but the symbol was never referred to by a dynamic
2521 object, or if all references were garbage collected. In
2522 such a case, we don't actually need to build a procedure
2523 linkage table, and we can just do a PC32 reloc instead. */
2524 h->plt.offset = (bfd_vma) -1;
2525 h->needs_plt = 0;
2526 }
2527
2528 return TRUE;
2529 }
2530 else
2531 /* It's possible that we incorrectly decided a .plt reloc was
2532 needed for an R_X86_64_PC32 reloc to a non-function sym in
2533 check_relocs. We can't decide accurately between function and
2534 non-function syms in check-relocs; Objects loaded later in
2535 the link may change h->type. So fix it now. */
2536 h->plt.offset = (bfd_vma) -1;
2537
2538 eh = (struct elf_x86_link_hash_entry *) h;
2539
2540 /* If this is a weak symbol, and there is a real definition, the
2541 processor independent code will have arranged for us to see the
2542 real definition first, and we can just use the same value. */
2543 if (h->u.weakdef != NULL)
2544 {
2545 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2546 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2547 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2548 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2549 if (ELIMINATE_COPY_RELOCS
2550 || info->nocopyreloc
2551 || SYMBOL_NO_COPYRELOC (info, eh))
2552 {
2553 h->non_got_ref = h->u.weakdef->non_got_ref;
2554 eh->needs_copy = h->u.weakdef->needs_copy;
2555 }
2556 return TRUE;
2557 }
2558
2559 /* This is a reference to a symbol defined by a dynamic object which
2560 is not a function. */
2561
2562 /* If we are creating a shared library, we must presume that the
2563 only references to the symbol are via the global offset table.
2564 For such cases we need not do anything here; the relocations will
2565 be handled correctly by relocate_section. */
2566 if (!bfd_link_executable (info))
2567 return TRUE;
2568
2569 /* If there are no references to this symbol that do not use the
2570 GOT, we don't need to generate a copy reloc. */
2571 if (!h->non_got_ref)
2572 return TRUE;
2573
2574 /* If -z nocopyreloc was given, we won't generate them either. */
2575 if (info->nocopyreloc || SYMBOL_NO_COPYRELOC (info, eh))
2576 {
2577 h->non_got_ref = 0;
2578 return TRUE;
2579 }
2580
2581 if (ELIMINATE_COPY_RELOCS)
2582 {
2583 eh = (struct elf_x86_link_hash_entry *) h;
2584 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2585 {
2586 s = p->sec->output_section;
2587 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2588 break;
2589 }
2590
2591 /* If we didn't find any dynamic relocs in read-only sections, then
2592 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
2593 if (p == NULL)
2594 {
2595 h->non_got_ref = 0;
2596 return TRUE;
2597 }
2598 }
2599
2600 /* We must allocate the symbol in our .dynbss section, which will
2601 become part of the .bss section of the executable. There will be
2602 an entry for this symbol in the .dynsym section. The dynamic
2603 object will contain position independent code, so all references
2604 from the dynamic object to this symbol will go through the global
2605 offset table. The dynamic linker will use the .dynsym entry to
2606 determine the address it must put in the global offset table, so
2607 both the dynamic object and the regular object will refer to the
2608 same memory location for the variable. */
2609
2610 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
2611 if (htab == NULL)
2612 return FALSE;
2613
2614 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
2615 to copy the initial value out of the dynamic object and into the
2616 runtime process image. */
2617 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
2618 {
2619 s = htab->elf.sdynrelro;
2620 srel = htab->elf.sreldynrelro;
2621 }
2622 else
2623 {
2624 s = htab->elf.sdynbss;
2625 srel = htab->elf.srelbss;
2626 }
2627 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2628 {
2629 const struct elf_backend_data *bed;
2630 bed = get_elf_backend_data (info->output_bfd);
2631 srel->size += bed->s->sizeof_rela;
2632 h->needs_copy = 1;
2633 }
2634
2635 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2636 }
2637
2638 /* Allocate space in .plt, .got and associated reloc sections for
2639 dynamic relocs. */
2640
2641 static bfd_boolean
2642 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2643 {
2644 struct bfd_link_info *info;
2645 struct elf_x86_link_hash_table *htab;
2646 struct elf_x86_link_hash_entry *eh;
2647 struct elf_dyn_relocs *p;
2648 const struct elf_backend_data *bed;
2649 unsigned int plt_entry_size;
2650 bfd_boolean resolved_to_zero;
2651
2652 if (h->root.type == bfd_link_hash_indirect)
2653 return TRUE;
2654
2655 eh = (struct elf_x86_link_hash_entry *) h;
2656
2657 info = (struct bfd_link_info *) inf;
2658 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
2659 if (htab == NULL)
2660 return FALSE;
2661 bed = get_elf_backend_data (info->output_bfd);
2662
2663 plt_entry_size = htab->plt.plt_entry_size;
2664
2665 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2666 X86_64_ELF_DATA,
2667 eh->has_got_reloc,
2668 eh);
2669
2670 /* We can't use the GOT PLT if pointer equality is needed since
2671 finish_dynamic_symbol won't clear symbol value and the dynamic
2672 linker won't update the GOT slot. We will get into an infinite
2673 loop at run-time. */
2674 if (htab->plt_got != NULL
2675 && h->type != STT_GNU_IFUNC
2676 && !h->pointer_equality_needed
2677 && h->plt.refcount > 0
2678 && h->got.refcount > 0)
2679 {
2680 /* Don't use the regular PLT if there are both GOT and GOTPLT
2681 reloctions. */
2682 h->plt.offset = (bfd_vma) -1;
2683
2684 /* Use the GOT PLT. */
2685 eh->plt_got.refcount = 1;
2686 }
2687
2688 /* Clear the reference count of function pointer relocations if
2689 symbol isn't a normal function. */
2690 if (h->type != STT_FUNC)
2691 eh->func_pointer_refcount = 0;
2692
2693 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2694 here if it is defined and referenced in a non-shared object. */
2695 if (h->type == STT_GNU_IFUNC
2696 && h->def_regular)
2697 {
2698 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2699 &eh->dyn_relocs,
2700 &htab->readonly_dynrelocs_against_ifunc,
2701 plt_entry_size,
2702 (htab->plt.has_plt0
2703 * plt_entry_size),
2704 GOT_ENTRY_SIZE, TRUE))
2705 {
2706 asection *s = htab->plt_second;
2707 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
2708 {
2709 /* Use the second PLT section if it is created. */
2710 eh->plt_second.offset = s->size;
2711
2712 /* Make room for this entry in the second PLT section. */
2713 s->size += htab->non_lazy_plt->plt_entry_size;
2714 }
2715
2716 return TRUE;
2717 }
2718 else
2719 return FALSE;
2720 }
2721 /* Don't create the PLT entry if there are only function pointer
2722 relocations which can be resolved at run-time. */
2723 else if (htab->elf.dynamic_sections_created
2724 && (h->plt.refcount > eh->func_pointer_refcount
2725 || eh->plt_got.refcount > 0))
2726 {
2727 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
2728
2729 /* Clear the reference count of function pointer relocations
2730 if PLT is used. */
2731 eh->func_pointer_refcount = 0;
2732
2733 /* Make sure this symbol is output as a dynamic symbol.
2734 Undefined weak syms won't yet be marked as dynamic. */
2735 if (h->dynindx == -1
2736 && !h->forced_local
2737 && !resolved_to_zero
2738 && h->root.type == bfd_link_hash_undefweak)
2739 {
2740 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2741 return FALSE;
2742 }
2743
2744 if (bfd_link_pic (info)
2745 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2746 {
2747 asection *s = htab->elf.splt;
2748 asection *second_s = htab->plt_second;
2749 asection *got_s = htab->plt_got;
2750
2751 /* If this is the first .plt entry, make room for the special
2752 first entry. The .plt section is used by prelink to undo
2753 prelinking for dynamic relocations. */
2754 if (s->size == 0)
2755 s->size = htab->plt.has_plt0 * plt_entry_size;
2756
2757 if (use_plt_got)
2758 eh->plt_got.offset = got_s->size;
2759 else
2760 {
2761 h->plt.offset = s->size;
2762 if (second_s)
2763 eh->plt_second.offset = second_s->size;
2764 }
2765
2766 /* If this symbol is not defined in a regular file, and we are
2767 not generating a shared library, then set the symbol to this
2768 location in the .plt. This is required to make function
2769 pointers compare as equal between the normal executable and
2770 the shared library. */
2771 if (! bfd_link_pic (info)
2772 && !h->def_regular)
2773 {
2774 if (use_plt_got)
2775 {
2776 /* We need to make a call to the entry of the GOT PLT
2777 instead of regular PLT entry. */
2778 h->root.u.def.section = got_s;
2779 h->root.u.def.value = eh->plt_got.offset;
2780 }
2781 else
2782 {
2783 if (second_s)
2784 {
2785 /* We need to make a call to the entry of the
2786 second PLT instead of regular PLT entry. */
2787 h->root.u.def.section = second_s;
2788 h->root.u.def.value = eh->plt_second.offset;
2789 }
2790 else
2791 {
2792 h->root.u.def.section = s;
2793 h->root.u.def.value = h->plt.offset;
2794 }
2795 }
2796 }
2797
2798 /* Make room for this entry. */
2799 if (use_plt_got)
2800 got_s->size += htab->non_lazy_plt->plt_entry_size;
2801 else
2802 {
2803 s->size += plt_entry_size;
2804 if (second_s)
2805 second_s->size += htab->non_lazy_plt->plt_entry_size;
2806
2807 /* We also need to make an entry in the .got.plt section,
2808 which will be placed in the .got section by the linker
2809 script. */
2810 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2811
2812 /* There should be no PLT relocation against resolved
2813 undefined weak symbol in executable. */
2814 if (!resolved_to_zero)
2815 {
2816 /* We also need to make an entry in the .rela.plt
2817 section. */
2818 htab->elf.srelplt->size += bed->s->sizeof_rela;
2819 htab->elf.srelplt->reloc_count++;
2820 }
2821 }
2822 }
2823 else
2824 {
2825 eh->plt_got.offset = (bfd_vma) -1;
2826 h->plt.offset = (bfd_vma) -1;
2827 h->needs_plt = 0;
2828 }
2829 }
2830 else
2831 {
2832 eh->plt_got.offset = (bfd_vma) -1;
2833 h->plt.offset = (bfd_vma) -1;
2834 h->needs_plt = 0;
2835 }
2836
2837 eh->tlsdesc_got = (bfd_vma) -1;
2838
2839 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2840 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2841 if (h->got.refcount > 0
2842 && bfd_link_executable (info)
2843 && h->dynindx == -1
2844 && elf_x86_hash_entry (h)->tls_type == GOT_TLS_IE)
2845 {
2846 h->got.offset = (bfd_vma) -1;
2847 }
2848 else if (h->got.refcount > 0)
2849 {
2850 asection *s;
2851 bfd_boolean dyn;
2852 int tls_type = elf_x86_hash_entry (h)->tls_type;
2853
2854 /* Make sure this symbol is output as a dynamic symbol.
2855 Undefined weak syms won't yet be marked as dynamic. */
2856 if (h->dynindx == -1
2857 && !h->forced_local
2858 && !resolved_to_zero
2859 && h->root.type == bfd_link_hash_undefweak)
2860 {
2861 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2862 return FALSE;
2863 }
2864
2865 if (GOT_TLS_GDESC_P (tls_type))
2866 {
2867 eh->tlsdesc_got = htab->elf.sgotplt->size
2868 - elf_x86_64_compute_jump_table_size (htab);
2869 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2870 h->got.offset = (bfd_vma) -2;
2871 }
2872 if (! GOT_TLS_GDESC_P (tls_type)
2873 || GOT_TLS_GD_P (tls_type))
2874 {
2875 s = htab->elf.sgot;
2876 h->got.offset = s->size;
2877 s->size += GOT_ENTRY_SIZE;
2878 if (GOT_TLS_GD_P (tls_type))
2879 s->size += GOT_ENTRY_SIZE;
2880 }
2881 dyn = htab->elf.dynamic_sections_created;
2882 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2883 and two if global. R_X86_64_GOTTPOFF needs one dynamic
2884 relocation. No dynamic relocation against resolved undefined
2885 weak symbol in executable. */
2886 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2887 || tls_type == GOT_TLS_IE)
2888 htab->elf.srelgot->size += bed->s->sizeof_rela;
2889 else if (GOT_TLS_GD_P (tls_type))
2890 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2891 else if (! GOT_TLS_GDESC_P (tls_type)
2892 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2893 && !resolved_to_zero)
2894 || h->root.type != bfd_link_hash_undefweak)
2895 && (bfd_link_pic (info)
2896 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2897 htab->elf.srelgot->size += bed->s->sizeof_rela;
2898 if (GOT_TLS_GDESC_P (tls_type))
2899 {
2900 htab->elf.srelplt->size += bed->s->sizeof_rela;
2901 htab->tlsdesc_plt = (bfd_vma) -1;
2902 }
2903 }
2904 else
2905 h->got.offset = (bfd_vma) -1;
2906
2907 if (eh->dyn_relocs == NULL)
2908 return TRUE;
2909
2910 /* In the shared -Bsymbolic case, discard space allocated for
2911 dynamic pc-relative relocs against symbols which turn out to be
2912 defined in regular objects. For the normal shared case, discard
2913 space for pc-relative relocs that have become local due to symbol
2914 visibility changes. */
2915
2916 if (bfd_link_pic (info))
2917 {
2918 /* Relocs that use pc_count are those that appear on a call
2919 insn, or certain REL relocs that can generated via assembly.
2920 We want calls to protected symbols to resolve directly to the
2921 function rather than going via the plt. If people want
2922 function pointer comparisons to work as expected then they
2923 should avoid writing weird assembly. */
2924 if (SYMBOL_CALLS_LOCAL (info, h))
2925 {
2926 struct elf_dyn_relocs **pp;
2927
2928 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2929 {
2930 p->count -= p->pc_count;
2931 p->pc_count = 0;
2932 if (p->count == 0)
2933 *pp = p->next;
2934 else
2935 pp = &p->next;
2936 }
2937 }
2938
2939 /* Also discard relocs on undefined weak syms with non-default
2940 visibility or in PIE. */
2941 if (eh->dyn_relocs != NULL)
2942 {
2943 if (h->root.type == bfd_link_hash_undefweak)
2944 {
2945 /* Undefined weak symbol is never bound locally in shared
2946 library. */
2947 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2948 || resolved_to_zero)
2949 eh->dyn_relocs = NULL;
2950 else if (h->dynindx == -1
2951 && ! h->forced_local
2952 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2953 return FALSE;
2954 }
2955 /* For PIE, discard space for pc-relative relocs against
2956 symbols which turn out to need copy relocs. */
2957 else if (bfd_link_executable (info)
2958 && (h->needs_copy || eh->needs_copy)
2959 && h->def_dynamic
2960 && !h->def_regular)
2961 {
2962 struct elf_dyn_relocs **pp;
2963
2964 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2965 {
2966 if (p->pc_count != 0)
2967 *pp = p->next;
2968 else
2969 pp = &p->next;
2970 }
2971 }
2972 }
2973 }
2974 else if (ELIMINATE_COPY_RELOCS)
2975 {
2976 /* For the non-shared case, discard space for relocs against
2977 symbols which turn out to need copy relocs or are not
2978 dynamic. Keep dynamic relocations for run-time function
2979 pointer initialization. */
2980
2981 if ((!h->non_got_ref
2982 || eh->func_pointer_refcount > 0
2983 || (h->root.type == bfd_link_hash_undefweak
2984 && !resolved_to_zero))
2985 && ((h->def_dynamic
2986 && !h->def_regular)
2987 || (htab->elf.dynamic_sections_created
2988 && (h->root.type == bfd_link_hash_undefweak
2989 || h->root.type == bfd_link_hash_undefined))))
2990 {
2991 /* Make sure this symbol is output as a dynamic symbol.
2992 Undefined weak syms won't yet be marked as dynamic. */
2993 if (h->dynindx == -1
2994 && ! h->forced_local
2995 && ! resolved_to_zero
2996 && h->root.type == bfd_link_hash_undefweak
2997 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2998 return FALSE;
2999
3000 /* If that succeeded, we know we'll be keeping all the
3001 relocs. */
3002 if (h->dynindx != -1)
3003 goto keep;
3004 }
3005
3006 eh->dyn_relocs = NULL;
3007 eh->func_pointer_refcount = 0;
3008
3009 keep: ;
3010 }
3011
3012 /* Finally, allocate space. */
3013 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3014 {
3015 asection * sreloc;
3016
3017 sreloc = elf_section_data (p->sec)->sreloc;
3018
3019 BFD_ASSERT (sreloc != NULL);
3020
3021 sreloc->size += p->count * bed->s->sizeof_rela;
3022 }
3023
3024 return TRUE;
3025 }
3026
3027 /* Allocate space in .plt, .got and associated reloc sections for
3028 local dynamic relocs. */
3029
3030 static bfd_boolean
3031 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
3032 {
3033 struct elf_link_hash_entry *h
3034 = (struct elf_link_hash_entry *) *slot;
3035
3036 if (h->type != STT_GNU_IFUNC
3037 || !h->def_regular
3038 || !h->ref_regular
3039 || !h->forced_local
3040 || h->root.type != bfd_link_hash_defined)
3041 abort ();
3042
3043 return elf_x86_64_allocate_dynrelocs (h, inf);
3044 }
3045
3046 /* Convert load via the GOT slot to load immediate. */
3047
3048 static bfd_boolean
3049 elf_x86_64_convert_load (bfd *abfd, asection *sec,
3050 struct bfd_link_info *link_info)
3051 {
3052 Elf_Internal_Shdr *symtab_hdr;
3053 Elf_Internal_Rela *internal_relocs;
3054 Elf_Internal_Rela *irel, *irelend;
3055 bfd_byte *contents;
3056 struct elf_x86_link_hash_table *htab;
3057 bfd_boolean changed;
3058 bfd_signed_vma *local_got_refcounts;
3059
3060 /* Don't even try to convert non-ELF outputs. */
3061 if (!is_elf_hash_table (link_info->hash))
3062 return FALSE;
3063
3064 /* Nothing to do if there is no need or no output. */
3065 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3066 || sec->need_convert_load == 0
3067 || bfd_is_abs_section (sec->output_section))
3068 return TRUE;
3069
3070 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3071
3072 /* Load the relocations for this section. */
3073 internal_relocs = (_bfd_elf_link_read_relocs
3074 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3075 link_info->keep_memory));
3076 if (internal_relocs == NULL)
3077 return FALSE;
3078
3079 changed = FALSE;
3080 htab = elf_x86_hash_table (link_info, X86_64_ELF_DATA);
3081 local_got_refcounts = elf_local_got_refcounts (abfd);
3082
3083 /* Get the section contents. */
3084 if (elf_section_data (sec)->this_hdr.contents != NULL)
3085 contents = elf_section_data (sec)->this_hdr.contents;
3086 else
3087 {
3088 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3089 goto error_return;
3090 }
3091
3092 irelend = internal_relocs + sec->reloc_count;
3093 for (irel = internal_relocs; irel < irelend; irel++)
3094 {
3095 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3096 unsigned int r_symndx;
3097 struct elf_link_hash_entry *h;
3098 bfd_boolean converted;
3099
3100 if (r_type != R_X86_64_GOTPCRELX
3101 && r_type != R_X86_64_REX_GOTPCRELX
3102 && r_type != R_X86_64_GOTPCREL)
3103 continue;
3104
3105 r_symndx = htab->r_sym (irel->r_info);
3106 if (r_symndx < symtab_hdr->sh_info)
3107 h = _bfd_elf_x86_get_local_sym_hash (htab, sec->owner,
3108 (const Elf_Internal_Rela *) irel,
3109 FALSE);
3110 else
3111 {
3112 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
3113 while (h->root.type == bfd_link_hash_indirect
3114 || h->root.type == bfd_link_hash_warning)
3115 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3116 }
3117
3118 /* STT_GNU_IFUNC must keep GOTPCREL relocations. */
3119 if (h != NULL && h->type == STT_GNU_IFUNC)
3120 continue;
3121
3122 converted = FALSE;
3123 if (!elf_x86_64_convert_load_reloc (abfd, sec, contents, irel, h,
3124 &converted, link_info))
3125 goto error_return;
3126
3127 if (converted)
3128 {
3129 changed = converted;
3130 if (h)
3131 {
3132 if (h->got.refcount > 0)
3133 h->got.refcount -= 1;
3134 }
3135 else
3136 {
3137 if (local_got_refcounts != NULL
3138 && local_got_refcounts[r_symndx] > 0)
3139 local_got_refcounts[r_symndx] -= 1;
3140 }
3141 }
3142 }
3143
3144 if (contents != NULL
3145 && elf_section_data (sec)->this_hdr.contents != contents)
3146 {
3147 if (!changed && !link_info->keep_memory)
3148 free (contents);
3149 else
3150 {
3151 /* Cache the section contents for elf_link_input_bfd. */
3152 elf_section_data (sec)->this_hdr.contents = contents;
3153 }
3154 }
3155
3156 if (elf_section_data (sec)->relocs != internal_relocs)
3157 {
3158 if (!changed)
3159 free (internal_relocs);
3160 else
3161 elf_section_data (sec)->relocs = internal_relocs;
3162 }
3163
3164 return TRUE;
3165
3166 error_return:
3167 if (contents != NULL
3168 && elf_section_data (sec)->this_hdr.contents != contents)
3169 free (contents);
3170 if (internal_relocs != NULL
3171 && elf_section_data (sec)->relocs != internal_relocs)
3172 free (internal_relocs);
3173 return FALSE;
3174 }
3175
3176 /* Set the sizes of the dynamic sections. */
3177
3178 static bfd_boolean
3179 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
3180 struct bfd_link_info *info)
3181 {
3182 struct elf_x86_link_hash_table *htab;
3183 bfd *dynobj;
3184 asection *s;
3185 bfd_boolean relocs;
3186 bfd *ibfd;
3187 const struct elf_backend_data *bed;
3188
3189 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
3190 if (htab == NULL)
3191 return FALSE;
3192 bed = get_elf_backend_data (output_bfd);
3193
3194 dynobj = htab->elf.dynobj;
3195 if (dynobj == NULL)
3196 abort ();
3197
3198 /* Set up .got offsets for local syms, and space for local dynamic
3199 relocs. */
3200 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3201 {
3202 bfd_signed_vma *local_got;
3203 bfd_signed_vma *end_local_got;
3204 char *local_tls_type;
3205 bfd_vma *local_tlsdesc_gotent;
3206 bfd_size_type locsymcount;
3207 Elf_Internal_Shdr *symtab_hdr;
3208 asection *srel;
3209
3210 if (! is_x86_64_elf (ibfd))
3211 continue;
3212
3213 for (s = ibfd->sections; s != NULL; s = s->next)
3214 {
3215 struct elf_dyn_relocs *p;
3216
3217 if (!elf_x86_64_convert_load (ibfd, s, info))
3218 return FALSE;
3219
3220 for (p = (struct elf_dyn_relocs *)
3221 (elf_section_data (s)->local_dynrel);
3222 p != NULL;
3223 p = p->next)
3224 {
3225 if (!bfd_is_abs_section (p->sec)
3226 && bfd_is_abs_section (p->sec->output_section))
3227 {
3228 /* Input section has been discarded, either because
3229 it is a copy of a linkonce section or due to
3230 linker script /DISCARD/, so we'll be discarding
3231 the relocs too. */
3232 }
3233 else if (p->count != 0)
3234 {
3235 srel = elf_section_data (p->sec)->sreloc;
3236 srel->size += p->count * bed->s->sizeof_rela;
3237 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3238 && (info->flags & DF_TEXTREL) == 0)
3239 {
3240 info->flags |= DF_TEXTREL;
3241 if ((info->warn_shared_textrel && bfd_link_pic (info))
3242 || info->error_textrel)
3243 /* xgettext:c-format */
3244 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3245 p->sec->owner, p->sec);
3246 }
3247 }
3248 }
3249 }
3250
3251 local_got = elf_local_got_refcounts (ibfd);
3252 if (!local_got)
3253 continue;
3254
3255 symtab_hdr = &elf_symtab_hdr (ibfd);
3256 locsymcount = symtab_hdr->sh_info;
3257 end_local_got = local_got + locsymcount;
3258 local_tls_type = elf_x86_local_got_tls_type (ibfd);
3259 local_tlsdesc_gotent = elf_x86_local_tlsdesc_gotent (ibfd);
3260 s = htab->elf.sgot;
3261 srel = htab->elf.srelgot;
3262 for (; local_got < end_local_got;
3263 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3264 {
3265 *local_tlsdesc_gotent = (bfd_vma) -1;
3266 if (*local_got > 0)
3267 {
3268 if (GOT_TLS_GDESC_P (*local_tls_type))
3269 {
3270 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3271 - elf_x86_64_compute_jump_table_size (htab);
3272 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
3273 *local_got = (bfd_vma) -2;
3274 }
3275 if (! GOT_TLS_GDESC_P (*local_tls_type)
3276 || GOT_TLS_GD_P (*local_tls_type))
3277 {
3278 *local_got = s->size;
3279 s->size += GOT_ENTRY_SIZE;
3280 if (GOT_TLS_GD_P (*local_tls_type))
3281 s->size += GOT_ENTRY_SIZE;
3282 }
3283 if (bfd_link_pic (info)
3284 || GOT_TLS_GD_ANY_P (*local_tls_type)
3285 || *local_tls_type == GOT_TLS_IE)
3286 {
3287 if (GOT_TLS_GDESC_P (*local_tls_type))
3288 {
3289 htab->elf.srelplt->size
3290 += bed->s->sizeof_rela;
3291 htab->tlsdesc_plt = (bfd_vma) -1;
3292 }
3293 if (! GOT_TLS_GDESC_P (*local_tls_type)
3294 || GOT_TLS_GD_P (*local_tls_type))
3295 srel->size += bed->s->sizeof_rela;
3296 }
3297 }
3298 else
3299 *local_got = (bfd_vma) -1;
3300 }
3301 }
3302
3303 if (htab->tls_ld_or_ldm_got.refcount > 0)
3304 {
3305 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
3306 relocs. */
3307 htab->tls_ld_or_ldm_got.offset = htab->elf.sgot->size;
3308 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
3309 htab->elf.srelgot->size += bed->s->sizeof_rela;
3310 }
3311 else
3312 htab->tls_ld_or_ldm_got.offset = -1;
3313
3314 /* Allocate global sym .plt and .got entries, and space for global
3315 sym dynamic relocs. */
3316 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
3317 info);
3318
3319 /* Allocate .plt and .got entries, and space for local symbols. */
3320 htab_traverse (htab->loc_hash_table,
3321 elf_x86_64_allocate_local_dynrelocs,
3322 info);
3323
3324 /* For every jump slot reserved in the sgotplt, reloc_count is
3325 incremented. However, when we reserve space for TLS descriptors,
3326 it's not incremented, so in order to compute the space reserved
3327 for them, it suffices to multiply the reloc count by the jump
3328 slot size.
3329
3330 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3331 so that R_X86_64_IRELATIVE entries come last. */
3332 if (htab->elf.srelplt)
3333 {
3334 htab->sgotplt_jump_table_size
3335 = elf_x86_64_compute_jump_table_size (htab);
3336 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3337 }
3338 else if (htab->elf.irelplt)
3339 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3340
3341 if (htab->tlsdesc_plt)
3342 {
3343 /* If we're not using lazy TLS relocations, don't generate the
3344 PLT and GOT entries they require. */
3345 if ((info->flags & DF_BIND_NOW))
3346 htab->tlsdesc_plt = 0;
3347 else
3348 {
3349 htab->tlsdesc_got = htab->elf.sgot->size;
3350 htab->elf.sgot->size += GOT_ENTRY_SIZE;
3351 /* Reserve room for the initial entry.
3352 FIXME: we could probably do away with it in this case. */
3353 if (htab->elf.splt->size == 0)
3354 htab->elf.splt->size = htab->plt.plt_entry_size;
3355 htab->tlsdesc_plt = htab->elf.splt->size;
3356 htab->elf.splt->size += htab->plt.plt_entry_size;
3357 }
3358 }
3359
3360 if (htab->elf.sgotplt)
3361 {
3362 /* Don't allocate .got.plt section if there are no GOT nor PLT
3363 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
3364 if ((htab->elf.hgot == NULL
3365 || !htab->elf.hgot->ref_regular_nonweak)
3366 && (htab->elf.sgotplt->size
3367 == get_elf_backend_data (output_bfd)->got_header_size)
3368 && (htab->elf.splt == NULL
3369 || htab->elf.splt->size == 0)
3370 && (htab->elf.sgot == NULL
3371 || htab->elf.sgot->size == 0)
3372 && (htab->elf.iplt == NULL
3373 || htab->elf.iplt->size == 0)
3374 && (htab->elf.igotplt == NULL
3375 || htab->elf.igotplt->size == 0))
3376 htab->elf.sgotplt->size = 0;
3377 }
3378
3379 if (_bfd_elf_eh_frame_present (info))
3380 {
3381 if (htab->plt_eh_frame != NULL
3382 && htab->elf.splt != NULL
3383 && htab->elf.splt->size != 0
3384 && !bfd_is_abs_section (htab->elf.splt->output_section))
3385 htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size;
3386
3387 if (htab->plt_got_eh_frame != NULL
3388 && htab->plt_got != NULL
3389 && htab->plt_got->size != 0
3390 && !bfd_is_abs_section (htab->plt_got->output_section))
3391 htab->plt_got_eh_frame->size
3392 = htab->non_lazy_plt->eh_frame_plt_size;
3393
3394 /* Unwind info for the second PLT and .plt.got sections are
3395 identical. */
3396 if (htab->plt_second_eh_frame != NULL
3397 && htab->plt_second != NULL
3398 && htab->plt_second->size != 0
3399 && !bfd_is_abs_section (htab->plt_second->output_section))
3400 htab->plt_second_eh_frame->size
3401 = htab->non_lazy_plt->eh_frame_plt_size;
3402 }
3403
3404 /* We now have determined the sizes of the various dynamic sections.
3405 Allocate memory for them. */
3406 relocs = FALSE;
3407 for (s = dynobj->sections; s != NULL; s = s->next)
3408 {
3409 if ((s->flags & SEC_LINKER_CREATED) == 0)
3410 continue;
3411
3412 if (s == htab->elf.splt
3413 || s == htab->elf.sgot
3414 || s == htab->elf.sgotplt
3415 || s == htab->elf.iplt
3416 || s == htab->elf.igotplt
3417 || s == htab->plt_second
3418 || s == htab->plt_got
3419 || s == htab->plt_eh_frame
3420 || s == htab->plt_got_eh_frame
3421 || s == htab->plt_second_eh_frame
3422 || s == htab->elf.sdynbss
3423 || s == htab->elf.sdynrelro)
3424 {
3425 /* Strip this section if we don't need it; see the
3426 comment below. */
3427 }
3428 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
3429 {
3430 if (s->size != 0 && s != htab->elf.srelplt)
3431 relocs = TRUE;
3432
3433 /* We use the reloc_count field as a counter if we need
3434 to copy relocs into the output file. */
3435 if (s != htab->elf.srelplt)
3436 s->reloc_count = 0;
3437 }
3438 else
3439 {
3440 /* It's not one of our sections, so don't allocate space. */
3441 continue;
3442 }
3443
3444 if (s->size == 0)
3445 {
3446 /* If we don't need this section, strip it from the
3447 output file. This is mostly to handle .rela.bss and
3448 .rela.plt. We must create both sections in
3449 create_dynamic_sections, because they must be created
3450 before the linker maps input sections to output
3451 sections. The linker does that before
3452 adjust_dynamic_symbol is called, and it is that
3453 function which decides whether anything needs to go
3454 into these sections. */
3455
3456 s->flags |= SEC_EXCLUDE;
3457 continue;
3458 }
3459
3460 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3461 continue;
3462
3463 /* Allocate memory for the section contents. We use bfd_zalloc
3464 here in case unused entries are not reclaimed before the
3465 section's contents are written out. This should not happen,
3466 but this way if it does, we get a R_X86_64_NONE reloc instead
3467 of garbage. */
3468 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
3469 if (s->contents == NULL)
3470 return FALSE;
3471 }
3472
3473 if (htab->plt_eh_frame != NULL
3474 && htab->plt_eh_frame->contents != NULL)
3475 {
3476 memcpy (htab->plt_eh_frame->contents,
3477 htab->plt.eh_frame_plt, htab->plt_eh_frame->size);
3478 bfd_put_32 (dynobj, htab->elf.splt->size,
3479 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3480 }
3481
3482 if (htab->plt_got_eh_frame != NULL
3483 && htab->plt_got_eh_frame->contents != NULL)
3484 {
3485 memcpy (htab->plt_got_eh_frame->contents,
3486 htab->non_lazy_plt->eh_frame_plt,
3487 htab->plt_got_eh_frame->size);
3488 bfd_put_32 (dynobj, htab->plt_got->size,
3489 (htab->plt_got_eh_frame->contents
3490 + PLT_FDE_LEN_OFFSET));
3491 }
3492
3493 if (htab->plt_second_eh_frame != NULL
3494 && htab->plt_second_eh_frame->contents != NULL)
3495 {
3496 memcpy (htab->plt_second_eh_frame->contents,
3497 htab->non_lazy_plt->eh_frame_plt,
3498 htab->plt_second_eh_frame->size);
3499 bfd_put_32 (dynobj, htab->plt_second->size,
3500 (htab->plt_second_eh_frame->contents
3501 + PLT_FDE_LEN_OFFSET));
3502 }
3503
3504 if (htab->elf.dynamic_sections_created)
3505 {
3506 /* Add some entries to the .dynamic section. We fill in the
3507 values later, in elf_x86_64_finish_dynamic_sections, but we
3508 must add the entries now so that we get the correct size for
3509 the .dynamic section. The DT_DEBUG entry is filled in by the
3510 dynamic linker and used by the debugger. */
3511 #define add_dynamic_entry(TAG, VAL) \
3512 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3513
3514 if (bfd_link_executable (info))
3515 {
3516 if (!add_dynamic_entry (DT_DEBUG, 0))
3517 return FALSE;
3518 }
3519
3520 if (htab->elf.splt->size != 0)
3521 {
3522 /* DT_PLTGOT is used by prelink even if there is no PLT
3523 relocation. */
3524 if (!add_dynamic_entry (DT_PLTGOT, 0))
3525 return FALSE;
3526 }
3527
3528 if (htab->elf.srelplt->size != 0)
3529 {
3530 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3531 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
3532 || !add_dynamic_entry (DT_JMPREL, 0))
3533 return FALSE;
3534 }
3535
3536 if (htab->tlsdesc_plt
3537 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
3538 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
3539 return FALSE;
3540
3541 if (relocs)
3542 {
3543 if (!add_dynamic_entry (DT_RELA, 0)
3544 || !add_dynamic_entry (DT_RELASZ, 0)
3545 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
3546 return FALSE;
3547
3548 /* If any dynamic relocs apply to a read-only section,
3549 then we need a DT_TEXTREL entry. */
3550 if ((info->flags & DF_TEXTREL) == 0)
3551 elf_link_hash_traverse (&htab->elf,
3552 _bfd_x86_elf_readonly_dynrelocs,
3553 info);
3554
3555 if ((info->flags & DF_TEXTREL) != 0)
3556 {
3557 if (htab->readonly_dynrelocs_against_ifunc)
3558 {
3559 info->callbacks->einfo
3560 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3561 bfd_set_error (bfd_error_bad_value);
3562 return FALSE;
3563 }
3564
3565 if (!add_dynamic_entry (DT_TEXTREL, 0))
3566 return FALSE;
3567 }
3568 }
3569 }
3570 #undef add_dynamic_entry
3571
3572 return TRUE;
3573 }
3574
3575 /* Return the relocation value for @tpoff relocation
3576 if STT_TLS virtual address is ADDRESS. */
3577
3578 static bfd_vma
3579 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
3580 {
3581 struct elf_link_hash_table *htab = elf_hash_table (info);
3582 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3583 bfd_vma static_tls_size;
3584
3585 /* If tls_segment is NULL, we should have signalled an error already. */
3586 if (htab->tls_sec == NULL)
3587 return 0;
3588
3589 /* Consider special static TLS alignment requirements. */
3590 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3591 return address - static_tls_size - htab->tls_sec->vma;
3592 }
3593
3594 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
3595 branch? */
3596
3597 static bfd_boolean
3598 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
3599 {
3600 /* Opcode Instruction
3601 0xe8 call
3602 0xe9 jump
3603 0x0f 0x8x conditional jump */
3604 return ((offset > 0
3605 && (contents [offset - 1] == 0xe8
3606 || contents [offset - 1] == 0xe9))
3607 || (offset > 1
3608 && contents [offset - 2] == 0x0f
3609 && (contents [offset - 1] & 0xf0) == 0x80));
3610 }
3611
3612 /* Relocate an x86_64 ELF section. */
3613
3614 static bfd_boolean
3615 elf_x86_64_relocate_section (bfd *output_bfd,
3616 struct bfd_link_info *info,
3617 bfd *input_bfd,
3618 asection *input_section,
3619 bfd_byte *contents,
3620 Elf_Internal_Rela *relocs,
3621 Elf_Internal_Sym *local_syms,
3622 asection **local_sections)
3623 {
3624 struct elf_x86_link_hash_table *htab;
3625 Elf_Internal_Shdr *symtab_hdr;
3626 struct elf_link_hash_entry **sym_hashes;
3627 bfd_vma *local_got_offsets;
3628 bfd_vma *local_tlsdesc_gotents;
3629 Elf_Internal_Rela *rel;
3630 Elf_Internal_Rela *wrel;
3631 Elf_Internal_Rela *relend;
3632 unsigned int plt_entry_size;
3633
3634 BFD_ASSERT (is_x86_64_elf (input_bfd));
3635
3636 /* Skip if check_relocs failed. */
3637 if (input_section->check_relocs_failed)
3638 return FALSE;
3639
3640 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
3641 if (htab == NULL)
3642 return FALSE;
3643 plt_entry_size = htab->plt.plt_entry_size;
3644 symtab_hdr = &elf_symtab_hdr (input_bfd);
3645 sym_hashes = elf_sym_hashes (input_bfd);
3646 local_got_offsets = elf_local_got_offsets (input_bfd);
3647 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
3648
3649 _bfd_x86_elf_set_tls_module_base (info);
3650
3651 rel = wrel = relocs;
3652 relend = relocs + input_section->reloc_count;
3653 for (; rel < relend; wrel++, rel++)
3654 {
3655 unsigned int r_type;
3656 reloc_howto_type *howto;
3657 unsigned long r_symndx;
3658 struct elf_link_hash_entry *h;
3659 struct elf_x86_link_hash_entry *eh;
3660 Elf_Internal_Sym *sym;
3661 asection *sec;
3662 bfd_vma off, offplt, plt_offset;
3663 bfd_vma relocation;
3664 bfd_boolean unresolved_reloc;
3665 bfd_reloc_status_type r;
3666 int tls_type;
3667 asection *base_got, *resolved_plt;
3668 bfd_vma st_size;
3669 bfd_boolean resolved_to_zero;
3670 bfd_boolean relative_reloc;
3671
3672 r_type = ELF32_R_TYPE (rel->r_info);
3673 if (r_type == (int) R_X86_64_GNU_VTINHERIT
3674 || r_type == (int) R_X86_64_GNU_VTENTRY)
3675 {
3676 if (wrel != rel)
3677 *wrel = *rel;
3678 continue;
3679 }
3680
3681 if (r_type >= (int) R_X86_64_standard)
3682 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
3683
3684 if (r_type != (int) R_X86_64_32
3685 || ABI_64_P (output_bfd))
3686 howto = x86_64_elf_howto_table + r_type;
3687 else
3688 howto = (x86_64_elf_howto_table
3689 + ARRAY_SIZE (x86_64_elf_howto_table) - 1);
3690 r_symndx = htab->r_sym (rel->r_info);
3691 h = NULL;
3692 sym = NULL;
3693 sec = NULL;
3694 unresolved_reloc = FALSE;
3695 if (r_symndx < symtab_hdr->sh_info)
3696 {
3697 sym = local_syms + r_symndx;
3698 sec = local_sections[r_symndx];
3699
3700 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
3701 &sec, rel);
3702 st_size = sym->st_size;
3703
3704 /* Relocate against local STT_GNU_IFUNC symbol. */
3705 if (!bfd_link_relocatable (info)
3706 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3707 {
3708 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd,
3709 rel, FALSE);
3710 if (h == NULL)
3711 abort ();
3712
3713 /* Set STT_GNU_IFUNC symbol value. */
3714 h->root.u.def.value = sym->st_value;
3715 h->root.u.def.section = sec;
3716 }
3717 }
3718 else
3719 {
3720 bfd_boolean warned ATTRIBUTE_UNUSED;
3721 bfd_boolean ignored ATTRIBUTE_UNUSED;
3722
3723 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3724 r_symndx, symtab_hdr, sym_hashes,
3725 h, sec, relocation,
3726 unresolved_reloc, warned, ignored);
3727 st_size = h->size;
3728 }
3729
3730 if (sec != NULL && discarded_section (sec))
3731 {
3732 _bfd_clear_contents (howto, input_bfd, input_section,
3733 contents + rel->r_offset);
3734 wrel->r_offset = rel->r_offset;
3735 wrel->r_info = 0;
3736 wrel->r_addend = 0;
3737
3738 /* For ld -r, remove relocations in debug sections against
3739 sections defined in discarded sections. Not done for
3740 eh_frame editing code expects to be present. */
3741 if (bfd_link_relocatable (info)
3742 && (input_section->flags & SEC_DEBUGGING))
3743 wrel--;
3744
3745 continue;
3746 }
3747
3748 if (bfd_link_relocatable (info))
3749 {
3750 if (wrel != rel)
3751 *wrel = *rel;
3752 continue;
3753 }
3754
3755 if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
3756 {
3757 if (r_type == R_X86_64_64)
3758 {
3759 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
3760 zero-extend it to 64bit if addend is zero. */
3761 r_type = R_X86_64_32;
3762 memset (contents + rel->r_offset + 4, 0, 4);
3763 }
3764 else if (r_type == R_X86_64_SIZE64)
3765 {
3766 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
3767 zero-extend it to 64bit if addend is zero. */
3768 r_type = R_X86_64_SIZE32;
3769 memset (contents + rel->r_offset + 4, 0, 4);
3770 }
3771 }
3772
3773 eh = (struct elf_x86_link_hash_entry *) h;
3774
3775 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3776 it here if it is defined in a non-shared object. */
3777 if (h != NULL
3778 && h->type == STT_GNU_IFUNC
3779 && h->def_regular)
3780 {
3781 bfd_vma plt_index;
3782 const char *name;
3783
3784 if ((input_section->flags & SEC_ALLOC) == 0)
3785 {
3786 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3787 sections because such sections are not SEC_ALLOC and
3788 thus ld.so will not process them. */
3789 if ((input_section->flags & SEC_DEBUGGING) != 0)
3790 continue;
3791 abort ();
3792 }
3793
3794 switch (r_type)
3795 {
3796 default:
3797 break;
3798
3799 case R_X86_64_GOTPCREL:
3800 case R_X86_64_GOTPCRELX:
3801 case R_X86_64_REX_GOTPCRELX:
3802 case R_X86_64_GOTPCREL64:
3803 base_got = htab->elf.sgot;
3804 off = h->got.offset;
3805
3806 if (base_got == NULL)
3807 abort ();
3808
3809 if (off == (bfd_vma) -1)
3810 {
3811 /* We can't use h->got.offset here to save state, or
3812 even just remember the offset, as finish_dynamic_symbol
3813 would use that as offset into .got. */
3814
3815 if (h->plt.offset == (bfd_vma) -1)
3816 abort ();
3817
3818 if (htab->elf.splt != NULL)
3819 {
3820 plt_index = (h->plt.offset / plt_entry_size
3821 - htab->plt.has_plt0);
3822 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3823 base_got = htab->elf.sgotplt;
3824 }
3825 else
3826 {
3827 plt_index = h->plt.offset / plt_entry_size;
3828 off = plt_index * GOT_ENTRY_SIZE;
3829 base_got = htab->elf.igotplt;
3830 }
3831
3832 if (h->dynindx == -1
3833 || h->forced_local
3834 || info->symbolic)
3835 {
3836 /* This references the local defitionion. We must
3837 initialize this entry in the global offset table.
3838 Since the offset must always be a multiple of 8,
3839 we use the least significant bit to record
3840 whether we have initialized it already.
3841
3842 When doing a dynamic link, we create a .rela.got
3843 relocation entry to initialize the value. This
3844 is done in the finish_dynamic_symbol routine. */
3845 if ((off & 1) != 0)
3846 off &= ~1;
3847 else
3848 {
3849 bfd_put_64 (output_bfd, relocation,
3850 base_got->contents + off);
3851 /* Note that this is harmless for the GOTPLT64
3852 case, as -1 | 1 still is -1. */
3853 h->got.offset |= 1;
3854 }
3855 }
3856 }
3857
3858 relocation = (base_got->output_section->vma
3859 + base_got->output_offset + off);
3860
3861 goto do_relocation;
3862 }
3863
3864 if (h->plt.offset == (bfd_vma) -1)
3865 {
3866 /* Handle static pointers of STT_GNU_IFUNC symbols. */
3867 if (r_type == htab->pointer_r_type
3868 && (input_section->flags & SEC_CODE) == 0)
3869 goto do_ifunc_pointer;
3870 goto bad_ifunc_reloc;
3871 }
3872
3873 /* STT_GNU_IFUNC symbol must go through PLT. */
3874 if (htab->elf.splt != NULL)
3875 {
3876 if (htab->plt_second != NULL)
3877 {
3878 resolved_plt = htab->plt_second;
3879 plt_offset = eh->plt_second.offset;
3880 }
3881 else
3882 {
3883 resolved_plt = htab->elf.splt;
3884 plt_offset = h->plt.offset;
3885 }
3886 }
3887 else
3888 {
3889 resolved_plt = htab->elf.iplt;
3890 plt_offset = h->plt.offset;
3891 }
3892
3893 relocation = (resolved_plt->output_section->vma
3894 + resolved_plt->output_offset + plt_offset);
3895
3896 switch (r_type)
3897 {
3898 default:
3899 bad_ifunc_reloc:
3900 if (h->root.root.string)
3901 name = h->root.root.string;
3902 else
3903 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3904 NULL);
3905 _bfd_error_handler
3906 /* xgettext:c-format */
3907 (_("%B: relocation %s against STT_GNU_IFUNC "
3908 "symbol `%s' isn't supported"), input_bfd,
3909 howto->name, name);
3910 bfd_set_error (bfd_error_bad_value);
3911 return FALSE;
3912
3913 case R_X86_64_32S:
3914 if (bfd_link_pic (info))
3915 abort ();
3916 goto do_relocation;
3917
3918 case R_X86_64_32:
3919 if (ABI_64_P (output_bfd))
3920 goto do_relocation;
3921 /* FALLTHROUGH */
3922 case R_X86_64_64:
3923 do_ifunc_pointer:
3924 if (rel->r_addend != 0)
3925 {
3926 if (h->root.root.string)
3927 name = h->root.root.string;
3928 else
3929 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
3930 sym, NULL);
3931 _bfd_error_handler
3932 /* xgettext:c-format */
3933 (_("%B: relocation %s against STT_GNU_IFUNC "
3934 "symbol `%s' has non-zero addend: %Ld"),
3935 input_bfd, howto->name, name, rel->r_addend);
3936 bfd_set_error (bfd_error_bad_value);
3937 return FALSE;
3938 }
3939
3940 /* Generate dynamic relcoation only when there is a
3941 non-GOT reference in a shared object or there is no
3942 PLT. */
3943 if ((bfd_link_pic (info) && h->non_got_ref)
3944 || h->plt.offset == (bfd_vma) -1)
3945 {
3946 Elf_Internal_Rela outrel;
3947 asection *sreloc;
3948
3949 /* Need a dynamic relocation to get the real function
3950 address. */
3951 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
3952 info,
3953 input_section,
3954 rel->r_offset);
3955 if (outrel.r_offset == (bfd_vma) -1
3956 || outrel.r_offset == (bfd_vma) -2)
3957 abort ();
3958
3959 outrel.r_offset += (input_section->output_section->vma
3960 + input_section->output_offset);
3961
3962 if (h->dynindx == -1
3963 || h->forced_local
3964 || bfd_link_executable (info))
3965 {
3966 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3967 h->root.root.string,
3968 h->root.u.def.section->owner);
3969
3970 /* This symbol is resolved locally. */
3971 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3972 outrel.r_addend = (h->root.u.def.value
3973 + h->root.u.def.section->output_section->vma
3974 + h->root.u.def.section->output_offset);
3975 }
3976 else
3977 {
3978 outrel.r_info = htab->r_info (h->dynindx, r_type);
3979 outrel.r_addend = 0;
3980 }
3981
3982 /* Dynamic relocations are stored in
3983 1. .rela.ifunc section in PIC object.
3984 2. .rela.got section in dynamic executable.
3985 3. .rela.iplt section in static executable. */
3986 if (bfd_link_pic (info))
3987 sreloc = htab->elf.irelifunc;
3988 else if (htab->elf.splt != NULL)
3989 sreloc = htab->elf.srelgot;
3990 else
3991 sreloc = htab->elf.irelplt;
3992 elf_append_rela (output_bfd, sreloc, &outrel);
3993
3994 /* If this reloc is against an external symbol, we
3995 do not want to fiddle with the addend. Otherwise,
3996 we need to include the symbol value so that it
3997 becomes an addend for the dynamic reloc. For an
3998 internal symbol, we have updated addend. */
3999 continue;
4000 }
4001 /* FALLTHROUGH */
4002 case R_X86_64_PC32:
4003 case R_X86_64_PC32_BND:
4004 case R_X86_64_PC64:
4005 case R_X86_64_PLT32:
4006 case R_X86_64_PLT32_BND:
4007 goto do_relocation;
4008 }
4009 }
4010
4011 resolved_to_zero = (eh != NULL
4012 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
4013 X86_64_ELF_DATA,
4014 eh->has_got_reloc,
4015 eh));
4016
4017 /* When generating a shared object, the relocations handled here are
4018 copied into the output file to be resolved at run time. */
4019 switch (r_type)
4020 {
4021 case R_X86_64_GOT32:
4022 case R_X86_64_GOT64:
4023 /* Relocation is to the entry for this symbol in the global
4024 offset table. */
4025 case R_X86_64_GOTPCREL:
4026 case R_X86_64_GOTPCRELX:
4027 case R_X86_64_REX_GOTPCRELX:
4028 case R_X86_64_GOTPCREL64:
4029 /* Use global offset table entry as symbol value. */
4030 case R_X86_64_GOTPLT64:
4031 /* This is obsolete and treated the same as GOT64. */
4032 base_got = htab->elf.sgot;
4033
4034 if (htab->elf.sgot == NULL)
4035 abort ();
4036
4037 relative_reloc = FALSE;
4038 if (h != NULL)
4039 {
4040 bfd_boolean dyn;
4041
4042 off = h->got.offset;
4043 if (h->needs_plt
4044 && h->plt.offset != (bfd_vma)-1
4045 && off == (bfd_vma)-1)
4046 {
4047 /* We can't use h->got.offset here to save
4048 state, or even just remember the offset, as
4049 finish_dynamic_symbol would use that as offset into
4050 .got. */
4051 bfd_vma plt_index = (h->plt.offset / plt_entry_size
4052 - htab->plt.has_plt0);
4053 off = (plt_index + 3) * GOT_ENTRY_SIZE;
4054 base_got = htab->elf.sgotplt;
4055 }
4056
4057 dyn = htab->elf.dynamic_sections_created;
4058
4059 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
4060 || (bfd_link_pic (info)
4061 && SYMBOL_REFERENCES_LOCAL (info, h))
4062 || (ELF_ST_VISIBILITY (h->other)
4063 && h->root.type == bfd_link_hash_undefweak))
4064 {
4065 /* This is actually a static link, or it is a -Bsymbolic
4066 link and the symbol is defined locally, or the symbol
4067 was forced to be local because of a version file. We
4068 must initialize this entry in the global offset table.
4069 Since the offset must always be a multiple of 8, we
4070 use the least significant bit to record whether we
4071 have initialized it already.
4072
4073 When doing a dynamic link, we create a .rela.got
4074 relocation entry to initialize the value. This is
4075 done in the finish_dynamic_symbol routine. */
4076 if ((off & 1) != 0)
4077 off &= ~1;
4078 else
4079 {
4080 bfd_put_64 (output_bfd, relocation,
4081 base_got->contents + off);
4082 /* Note that this is harmless for the GOTPLT64 case,
4083 as -1 | 1 still is -1. */
4084 h->got.offset |= 1;
4085
4086 if (h->dynindx == -1
4087 && !h->forced_local
4088 && h->root.type != bfd_link_hash_undefweak
4089 && bfd_link_pic (info))
4090 {
4091 /* If this symbol isn't dynamic in PIC,
4092 generate R_X86_64_RELATIVE here. */
4093 eh->no_finish_dynamic_symbol = 1;
4094 relative_reloc = TRUE;
4095 }
4096 }
4097 }
4098 else
4099 unresolved_reloc = FALSE;
4100 }
4101 else
4102 {
4103 if (local_got_offsets == NULL)
4104 abort ();
4105
4106 off = local_got_offsets[r_symndx];
4107
4108 /* The offset must always be a multiple of 8. We use
4109 the least significant bit to record whether we have
4110 already generated the necessary reloc. */
4111 if ((off & 1) != 0)
4112 off &= ~1;
4113 else
4114 {
4115 bfd_put_64 (output_bfd, relocation,
4116 base_got->contents + off);
4117 local_got_offsets[r_symndx] |= 1;
4118
4119 if (bfd_link_pic (info))
4120 relative_reloc = TRUE;
4121 }
4122 }
4123
4124 if (relative_reloc)
4125 {
4126 asection *s;
4127 Elf_Internal_Rela outrel;
4128
4129 /* We need to generate a R_X86_64_RELATIVE reloc
4130 for the dynamic linker. */
4131 s = htab->elf.srelgot;
4132 if (s == NULL)
4133 abort ();
4134
4135 outrel.r_offset = (base_got->output_section->vma
4136 + base_got->output_offset
4137 + off);
4138 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4139 outrel.r_addend = relocation;
4140 elf_append_rela (output_bfd, s, &outrel);
4141 }
4142
4143 if (off >= (bfd_vma) -2)
4144 abort ();
4145
4146 relocation = base_got->output_section->vma
4147 + base_got->output_offset + off;
4148 if (r_type != R_X86_64_GOTPCREL
4149 && r_type != R_X86_64_GOTPCRELX
4150 && r_type != R_X86_64_REX_GOTPCRELX
4151 && r_type != R_X86_64_GOTPCREL64)
4152 relocation -= htab->elf.sgotplt->output_section->vma
4153 - htab->elf.sgotplt->output_offset;
4154
4155 break;
4156
4157 case R_X86_64_GOTOFF64:
4158 /* Relocation is relative to the start of the global offset
4159 table. */
4160
4161 /* Check to make sure it isn't a protected function or data
4162 symbol for shared library since it may not be local when
4163 used as function address or with copy relocation. We also
4164 need to make sure that a symbol is referenced locally. */
4165 if (bfd_link_pic (info) && h)
4166 {
4167 if (!h->def_regular)
4168 {
4169 const char *v;
4170
4171 switch (ELF_ST_VISIBILITY (h->other))
4172 {
4173 case STV_HIDDEN:
4174 v = _("hidden symbol");
4175 break;
4176 case STV_INTERNAL:
4177 v = _("internal symbol");
4178 break;
4179 case STV_PROTECTED:
4180 v = _("protected symbol");
4181 break;
4182 default:
4183 v = _("symbol");
4184 break;
4185 }
4186
4187 _bfd_error_handler
4188 /* xgettext:c-format */
4189 (_("%B: relocation R_X86_64_GOTOFF64 against undefined %s"
4190 " `%s' can not be used when making a shared object"),
4191 input_bfd, v, h->root.root.string);
4192 bfd_set_error (bfd_error_bad_value);
4193 return FALSE;
4194 }
4195 else if (!bfd_link_executable (info)
4196 && !SYMBOL_REFERENCES_LOCAL (info, h)
4197 && (h->type == STT_FUNC
4198 || h->type == STT_OBJECT)
4199 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4200 {
4201 _bfd_error_handler
4202 /* xgettext:c-format */
4203 (_("%B: relocation R_X86_64_GOTOFF64 against protected %s"
4204 " `%s' can not be used when making a shared object"),
4205 input_bfd,
4206 h->type == STT_FUNC ? "function" : "data",
4207 h->root.root.string);
4208 bfd_set_error (bfd_error_bad_value);
4209 return FALSE;
4210 }
4211 }
4212
4213 /* Note that sgot is not involved in this
4214 calculation. We always want the start of .got.plt. If we
4215 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4216 permitted by the ABI, we might have to change this
4217 calculation. */
4218 relocation -= htab->elf.sgotplt->output_section->vma
4219 + htab->elf.sgotplt->output_offset;
4220 break;
4221
4222 case R_X86_64_GOTPC32:
4223 case R_X86_64_GOTPC64:
4224 /* Use global offset table as symbol value. */
4225 relocation = htab->elf.sgotplt->output_section->vma
4226 + htab->elf.sgotplt->output_offset;
4227 unresolved_reloc = FALSE;
4228 break;
4229
4230 case R_X86_64_PLTOFF64:
4231 /* Relocation is PLT entry relative to GOT. For local
4232 symbols it's the symbol itself relative to GOT. */
4233 if (h != NULL
4234 /* See PLT32 handling. */
4235 && (h->plt.offset != (bfd_vma) -1
4236 || eh->plt_got.offset != (bfd_vma) -1)
4237 && htab->elf.splt != NULL)
4238 {
4239 if (eh->plt_got.offset != (bfd_vma) -1)
4240 {
4241 /* Use the GOT PLT. */
4242 resolved_plt = htab->plt_got;
4243 plt_offset = eh->plt_got.offset;
4244 }
4245 else if (htab->plt_second != NULL)
4246 {
4247 resolved_plt = htab->plt_second;
4248 plt_offset = eh->plt_second.offset;
4249 }
4250 else
4251 {
4252 resolved_plt = htab->elf.splt;
4253 plt_offset = h->plt.offset;
4254 }
4255
4256 relocation = (resolved_plt->output_section->vma
4257 + resolved_plt->output_offset
4258 + plt_offset);
4259 unresolved_reloc = FALSE;
4260 }
4261
4262 relocation -= htab->elf.sgotplt->output_section->vma
4263 + htab->elf.sgotplt->output_offset;
4264 break;
4265
4266 case R_X86_64_PLT32:
4267 case R_X86_64_PLT32_BND:
4268 /* Relocation is to the entry for this symbol in the
4269 procedure linkage table. */
4270
4271 /* Resolve a PLT32 reloc against a local symbol directly,
4272 without using the procedure linkage table. */
4273 if (h == NULL)
4274 break;
4275
4276 if ((h->plt.offset == (bfd_vma) -1
4277 && eh->plt_got.offset == (bfd_vma) -1)
4278 || htab->elf.splt == NULL)
4279 {
4280 /* We didn't make a PLT entry for this symbol. This
4281 happens when statically linking PIC code, or when
4282 using -Bsymbolic. */
4283 break;
4284 }
4285
4286 if (h->plt.offset != (bfd_vma) -1)
4287 {
4288 if (htab->plt_second != NULL)
4289 {
4290 resolved_plt = htab->plt_second;
4291 plt_offset = eh->plt_second.offset;
4292 }
4293 else
4294 {
4295 resolved_plt = htab->elf.splt;
4296 plt_offset = h->plt.offset;
4297 }
4298 }
4299 else
4300 {
4301 /* Use the GOT PLT. */
4302 resolved_plt = htab->plt_got;
4303 plt_offset = eh->plt_got.offset;
4304 }
4305
4306 relocation = (resolved_plt->output_section->vma
4307 + resolved_plt->output_offset
4308 + plt_offset);
4309 unresolved_reloc = FALSE;
4310 break;
4311
4312 case R_X86_64_SIZE32:
4313 case R_X86_64_SIZE64:
4314 /* Set to symbol size. */
4315 relocation = st_size;
4316 goto direct;
4317
4318 case R_X86_64_PC8:
4319 case R_X86_64_PC16:
4320 case R_X86_64_PC32:
4321 case R_X86_64_PC32_BND:
4322 /* Don't complain about -fPIC if the symbol is undefined when
4323 building executable unless it is unresolved weak symbol or
4324 -z nocopyreloc is used. */
4325 if ((input_section->flags & SEC_ALLOC) != 0
4326 && (input_section->flags & SEC_READONLY) != 0
4327 && h != NULL
4328 && ((bfd_link_executable (info)
4329 && ((h->root.type == bfd_link_hash_undefweak
4330 && !resolved_to_zero)
4331 || ((info->nocopyreloc
4332 || (eh->def_protected
4333 && elf_has_no_copy_on_protected (h->root.u.def.section->owner)))
4334 && h->def_dynamic
4335 && !(h->root.u.def.section->flags & SEC_CODE))))
4336 || bfd_link_dll (info)))
4337 {
4338 bfd_boolean fail = FALSE;
4339 bfd_boolean branch
4340 = ((r_type == R_X86_64_PC32
4341 || r_type == R_X86_64_PC32_BND)
4342 && is_32bit_relative_branch (contents, rel->r_offset));
4343
4344 if (SYMBOL_REFERENCES_LOCAL (info, h))
4345 {
4346 /* Symbol is referenced locally. Make sure it is
4347 defined locally or for a branch. */
4348 fail = (!(h->def_regular || ELF_COMMON_DEF_P (h))
4349 && !branch);
4350 }
4351 else if (!(bfd_link_pie (info)
4352 && (h->needs_copy || eh->needs_copy)))
4353 {
4354 /* Symbol doesn't need copy reloc and isn't referenced
4355 locally. We only allow branch to symbol with
4356 non-default visibility. */
4357 fail = (!branch
4358 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
4359 }
4360
4361 if (fail)
4362 return elf_x86_64_need_pic (info, input_bfd, input_section,
4363 h, NULL, NULL, howto);
4364 }
4365 /* Fall through. */
4366
4367 case R_X86_64_8:
4368 case R_X86_64_16:
4369 case R_X86_64_32:
4370 case R_X86_64_PC64:
4371 case R_X86_64_64:
4372 /* FIXME: The ABI says the linker should make sure the value is
4373 the same when it's zeroextended to 64 bit. */
4374
4375 direct:
4376 if ((input_section->flags & SEC_ALLOC) == 0)
4377 break;
4378
4379 /* Don't copy a pc-relative relocation into the output file
4380 if the symbol needs copy reloc or the symbol is undefined
4381 when building executable. Copy dynamic function pointer
4382 relocations. Don't generate dynamic relocations against
4383 resolved undefined weak symbols in PIE. */
4384 if ((bfd_link_pic (info)
4385 && !(bfd_link_pie (info)
4386 && h != NULL
4387 && (h->needs_copy
4388 || eh->needs_copy
4389 || h->root.type == bfd_link_hash_undefined)
4390 && (IS_X86_64_PCREL_TYPE (r_type)
4391 || r_type == R_X86_64_SIZE32
4392 || r_type == R_X86_64_SIZE64))
4393 && (h == NULL
4394 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4395 && !resolved_to_zero)
4396 || h->root.type != bfd_link_hash_undefweak))
4397 && ((! IS_X86_64_PCREL_TYPE (r_type)
4398 && r_type != R_X86_64_SIZE32
4399 && r_type != R_X86_64_SIZE64)
4400 || ! SYMBOL_CALLS_LOCAL (info, h)))
4401 || (ELIMINATE_COPY_RELOCS
4402 && !bfd_link_pic (info)
4403 && h != NULL
4404 && h->dynindx != -1
4405 && (!h->non_got_ref
4406 || eh->func_pointer_refcount > 0
4407 || (h->root.type == bfd_link_hash_undefweak
4408 && !resolved_to_zero))
4409 && ((h->def_dynamic && !h->def_regular)
4410 /* Undefined weak symbol is bound locally when
4411 PIC is false. */
4412 || h->root.type == bfd_link_hash_undefined)))
4413 {
4414 Elf_Internal_Rela outrel;
4415 bfd_boolean skip, relocate;
4416 asection *sreloc;
4417
4418 /* When generating a shared object, these relocations
4419 are copied into the output file to be resolved at run
4420 time. */
4421 skip = FALSE;
4422 relocate = FALSE;
4423
4424 outrel.r_offset =
4425 _bfd_elf_section_offset (output_bfd, info, input_section,
4426 rel->r_offset);
4427 if (outrel.r_offset == (bfd_vma) -1)
4428 skip = TRUE;
4429 else if (outrel.r_offset == (bfd_vma) -2)
4430 skip = TRUE, relocate = TRUE;
4431
4432 outrel.r_offset += (input_section->output_section->vma
4433 + input_section->output_offset);
4434
4435 if (skip)
4436 memset (&outrel, 0, sizeof outrel);
4437
4438 /* h->dynindx may be -1 if this symbol was marked to
4439 become local. */
4440 else if (h != NULL
4441 && h->dynindx != -1
4442 && (IS_X86_64_PCREL_TYPE (r_type)
4443 || !(bfd_link_executable (info)
4444 || SYMBOLIC_BIND (info, h))
4445 || ! h->def_regular))
4446 {
4447 outrel.r_info = htab->r_info (h->dynindx, r_type);
4448 outrel.r_addend = rel->r_addend;
4449 }
4450 else
4451 {
4452 /* This symbol is local, or marked to become local.
4453 When relocation overflow check is disabled, we
4454 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
4455 if (r_type == htab->pointer_r_type
4456 || (r_type == R_X86_64_32
4457 && info->no_reloc_overflow_check))
4458 {
4459 relocate = TRUE;
4460 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4461 outrel.r_addend = relocation + rel->r_addend;
4462 }
4463 else if (r_type == R_X86_64_64
4464 && !ABI_64_P (output_bfd))
4465 {
4466 relocate = TRUE;
4467 outrel.r_info = htab->r_info (0,
4468 R_X86_64_RELATIVE64);
4469 outrel.r_addend = relocation + rel->r_addend;
4470 /* Check addend overflow. */
4471 if ((outrel.r_addend & 0x80000000)
4472 != (rel->r_addend & 0x80000000))
4473 {
4474 const char *name;
4475 int addend = rel->r_addend;
4476 if (h && h->root.root.string)
4477 name = h->root.root.string;
4478 else
4479 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
4480 sym, NULL);
4481 _bfd_error_handler
4482 /* xgettext:c-format */
4483 (_("%B: addend %s%#x in relocation %s against "
4484 "symbol `%s' at %#Lx in section `%A' is "
4485 "out of range"),
4486 input_bfd, addend < 0 ? "-" : "", addend,
4487 howto->name, name, rel->r_offset, input_section);
4488 bfd_set_error (bfd_error_bad_value);
4489 return FALSE;
4490 }
4491 }
4492 else
4493 {
4494 long sindx;
4495
4496 if (bfd_is_abs_section (sec))
4497 sindx = 0;
4498 else if (sec == NULL || sec->owner == NULL)
4499 {
4500 bfd_set_error (bfd_error_bad_value);
4501 return FALSE;
4502 }
4503 else
4504 {
4505 asection *osec;
4506
4507 /* We are turning this relocation into one
4508 against a section symbol. It would be
4509 proper to subtract the symbol's value,
4510 osec->vma, from the emitted reloc addend,
4511 but ld.so expects buggy relocs. */
4512 osec = sec->output_section;
4513 sindx = elf_section_data (osec)->dynindx;
4514 if (sindx == 0)
4515 {
4516 asection *oi = htab->elf.text_index_section;
4517 sindx = elf_section_data (oi)->dynindx;
4518 }
4519 BFD_ASSERT (sindx != 0);
4520 }
4521
4522 outrel.r_info = htab->r_info (sindx, r_type);
4523 outrel.r_addend = relocation + rel->r_addend;
4524 }
4525 }
4526
4527 sreloc = elf_section_data (input_section)->sreloc;
4528
4529 if (sreloc == NULL || sreloc->contents == NULL)
4530 {
4531 r = bfd_reloc_notsupported;
4532 goto check_relocation_error;
4533 }
4534
4535 elf_append_rela (output_bfd, sreloc, &outrel);
4536
4537 /* If this reloc is against an external symbol, we do
4538 not want to fiddle with the addend. Otherwise, we
4539 need to include the symbol value so that it becomes
4540 an addend for the dynamic reloc. */
4541 if (! relocate)
4542 continue;
4543 }
4544
4545 break;
4546
4547 case R_X86_64_TLSGD:
4548 case R_X86_64_GOTPC32_TLSDESC:
4549 case R_X86_64_TLSDESC_CALL:
4550 case R_X86_64_GOTTPOFF:
4551 tls_type = GOT_UNKNOWN;
4552 if (h == NULL && local_got_offsets)
4553 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
4554 else if (h != NULL)
4555 tls_type = elf_x86_hash_entry (h)->tls_type;
4556
4557 if (! elf_x86_64_tls_transition (info, input_bfd,
4558 input_section, contents,
4559 symtab_hdr, sym_hashes,
4560 &r_type, tls_type, rel,
4561 relend, h, r_symndx, TRUE))
4562 return FALSE;
4563
4564 if (r_type == R_X86_64_TPOFF32)
4565 {
4566 bfd_vma roff = rel->r_offset;
4567
4568 BFD_ASSERT (! unresolved_reloc);
4569
4570 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4571 {
4572 /* GD->LE transition. For 64bit, change
4573 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4574 .word 0x6666; rex64; call __tls_get_addr@PLT
4575 or
4576 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4577 .byte 0x66; rex64
4578 call *__tls_get_addr@GOTPCREL(%rip)
4579 which may be converted to
4580 addr32 call __tls_get_addr
4581 into:
4582 movq %fs:0, %rax
4583 leaq foo@tpoff(%rax), %rax
4584 For 32bit, change
4585 leaq foo@tlsgd(%rip), %rdi
4586 .word 0x6666; rex64; call __tls_get_addr@PLT
4587 or
4588 leaq foo@tlsgd(%rip), %rdi
4589 .byte 0x66; rex64
4590 call *__tls_get_addr@GOTPCREL(%rip)
4591 which may be converted to
4592 addr32 call __tls_get_addr
4593 into:
4594 movl %fs:0, %eax
4595 leaq foo@tpoff(%rax), %rax
4596 For largepic, change:
4597 leaq foo@tlsgd(%rip), %rdi
4598 movabsq $__tls_get_addr@pltoff, %rax
4599 addq %r15, %rax
4600 call *%rax
4601 into:
4602 movq %fs:0, %rax
4603 leaq foo@tpoff(%rax), %rax
4604 nopw 0x0(%rax,%rax,1) */
4605 int largepic = 0;
4606 if (ABI_64_P (output_bfd))
4607 {
4608 if (contents[roff + 5] == 0xb8)
4609 {
4610 memcpy (contents + roff - 3,
4611 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
4612 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4613 largepic = 1;
4614 }
4615 else
4616 memcpy (contents + roff - 4,
4617 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4618 16);
4619 }
4620 else
4621 memcpy (contents + roff - 3,
4622 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
4623 15);
4624 bfd_put_32 (output_bfd,
4625 elf_x86_64_tpoff (info, relocation),
4626 contents + roff + 8 + largepic);
4627 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
4628 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
4629 rel++;
4630 wrel++;
4631 continue;
4632 }
4633 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4634 {
4635 /* GDesc -> LE transition.
4636 It's originally something like:
4637 leaq x@tlsdesc(%rip), %rax
4638
4639 Change it to:
4640 movl $x@tpoff, %rax. */
4641
4642 unsigned int val, type;
4643
4644 type = bfd_get_8 (input_bfd, contents + roff - 3);
4645 val = bfd_get_8 (input_bfd, contents + roff - 1);
4646 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
4647 contents + roff - 3);
4648 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
4649 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4650 contents + roff - 1);
4651 bfd_put_32 (output_bfd,
4652 elf_x86_64_tpoff (info, relocation),
4653 contents + roff);
4654 continue;
4655 }
4656 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4657 {
4658 /* GDesc -> LE transition.
4659 It's originally:
4660 call *(%rax)
4661 Turn it into:
4662 xchg %ax,%ax. */
4663 bfd_put_8 (output_bfd, 0x66, contents + roff);
4664 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4665 continue;
4666 }
4667 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
4668 {
4669 /* IE->LE transition:
4670 For 64bit, originally it can be one of:
4671 movq foo@gottpoff(%rip), %reg
4672 addq foo@gottpoff(%rip), %reg
4673 We change it into:
4674 movq $foo, %reg
4675 leaq foo(%reg), %reg
4676 addq $foo, %reg.
4677 For 32bit, originally it can be one of:
4678 movq foo@gottpoff(%rip), %reg
4679 addl foo@gottpoff(%rip), %reg
4680 We change it into:
4681 movq $foo, %reg
4682 leal foo(%reg), %reg
4683 addl $foo, %reg. */
4684
4685 unsigned int val, type, reg;
4686
4687 if (roff >= 3)
4688 val = bfd_get_8 (input_bfd, contents + roff - 3);
4689 else
4690 val = 0;
4691 type = bfd_get_8 (input_bfd, contents + roff - 2);
4692 reg = bfd_get_8 (input_bfd, contents + roff - 1);
4693 reg >>= 3;
4694 if (type == 0x8b)
4695 {
4696 /* movq */
4697 if (val == 0x4c)
4698 bfd_put_8 (output_bfd, 0x49,
4699 contents + roff - 3);
4700 else if (!ABI_64_P (output_bfd) && val == 0x44)
4701 bfd_put_8 (output_bfd, 0x41,
4702 contents + roff - 3);
4703 bfd_put_8 (output_bfd, 0xc7,
4704 contents + roff - 2);
4705 bfd_put_8 (output_bfd, 0xc0 | reg,
4706 contents + roff - 1);
4707 }
4708 else if (reg == 4)
4709 {
4710 /* addq/addl -> addq/addl - addressing with %rsp/%r12
4711 is special */
4712 if (val == 0x4c)
4713 bfd_put_8 (output_bfd, 0x49,
4714 contents + roff - 3);
4715 else if (!ABI_64_P (output_bfd) && val == 0x44)
4716 bfd_put_8 (output_bfd, 0x41,
4717 contents + roff - 3);
4718 bfd_put_8 (output_bfd, 0x81,
4719 contents + roff - 2);
4720 bfd_put_8 (output_bfd, 0xc0 | reg,
4721 contents + roff - 1);
4722 }
4723 else
4724 {
4725 /* addq/addl -> leaq/leal */
4726 if (val == 0x4c)
4727 bfd_put_8 (output_bfd, 0x4d,
4728 contents + roff - 3);
4729 else if (!ABI_64_P (output_bfd) && val == 0x44)
4730 bfd_put_8 (output_bfd, 0x45,
4731 contents + roff - 3);
4732 bfd_put_8 (output_bfd, 0x8d,
4733 contents + roff - 2);
4734 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
4735 contents + roff - 1);
4736 }
4737 bfd_put_32 (output_bfd,
4738 elf_x86_64_tpoff (info, relocation),
4739 contents + roff);
4740 continue;
4741 }
4742 else
4743 BFD_ASSERT (FALSE);
4744 }
4745
4746 if (htab->elf.sgot == NULL)
4747 abort ();
4748
4749 if (h != NULL)
4750 {
4751 off = h->got.offset;
4752 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
4753 }
4754 else
4755 {
4756 if (local_got_offsets == NULL)
4757 abort ();
4758
4759 off = local_got_offsets[r_symndx];
4760 offplt = local_tlsdesc_gotents[r_symndx];
4761 }
4762
4763 if ((off & 1) != 0)
4764 off &= ~1;
4765 else
4766 {
4767 Elf_Internal_Rela outrel;
4768 int dr_type, indx;
4769 asection *sreloc;
4770
4771 if (htab->elf.srelgot == NULL)
4772 abort ();
4773
4774 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4775
4776 if (GOT_TLS_GDESC_P (tls_type))
4777 {
4778 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
4779 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
4780 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
4781 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4782 + htab->elf.sgotplt->output_offset
4783 + offplt
4784 + htab->sgotplt_jump_table_size);
4785 sreloc = htab->elf.srelplt;
4786 if (indx == 0)
4787 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info);
4788 else
4789 outrel.r_addend = 0;
4790 elf_append_rela (output_bfd, sreloc, &outrel);
4791 }
4792
4793 sreloc = htab->elf.srelgot;
4794
4795 outrel.r_offset = (htab->elf.sgot->output_section->vma
4796 + htab->elf.sgot->output_offset + off);
4797
4798 if (GOT_TLS_GD_P (tls_type))
4799 dr_type = R_X86_64_DTPMOD64;
4800 else if (GOT_TLS_GDESC_P (tls_type))
4801 goto dr_done;
4802 else
4803 dr_type = R_X86_64_TPOFF64;
4804
4805 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
4806 outrel.r_addend = 0;
4807 if ((dr_type == R_X86_64_TPOFF64
4808 || dr_type == R_X86_64_TLSDESC) && indx == 0)
4809 outrel.r_addend = relocation - _bfd_x86_elf_dtpoff_base (info);
4810 outrel.r_info = htab->r_info (indx, dr_type);
4811
4812 elf_append_rela (output_bfd, sreloc, &outrel);
4813
4814 if (GOT_TLS_GD_P (tls_type))
4815 {
4816 if (indx == 0)
4817 {
4818 BFD_ASSERT (! unresolved_reloc);
4819 bfd_put_64 (output_bfd,
4820 relocation - _bfd_x86_elf_dtpoff_base (info),
4821 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4822 }
4823 else
4824 {
4825 bfd_put_64 (output_bfd, 0,
4826 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
4827 outrel.r_info = htab->r_info (indx,
4828 R_X86_64_DTPOFF64);
4829 outrel.r_offset += GOT_ENTRY_SIZE;
4830 elf_append_rela (output_bfd, sreloc,
4831 &outrel);
4832 }
4833 }
4834
4835 dr_done:
4836 if (h != NULL)
4837 h->got.offset |= 1;
4838 else
4839 local_got_offsets[r_symndx] |= 1;
4840 }
4841
4842 if (off >= (bfd_vma) -2
4843 && ! GOT_TLS_GDESC_P (tls_type))
4844 abort ();
4845 if (r_type == ELF32_R_TYPE (rel->r_info))
4846 {
4847 if (r_type == R_X86_64_GOTPC32_TLSDESC
4848 || r_type == R_X86_64_TLSDESC_CALL)
4849 relocation = htab->elf.sgotplt->output_section->vma
4850 + htab->elf.sgotplt->output_offset
4851 + offplt + htab->sgotplt_jump_table_size;
4852 else
4853 relocation = htab->elf.sgot->output_section->vma
4854 + htab->elf.sgot->output_offset + off;
4855 unresolved_reloc = FALSE;
4856 }
4857 else
4858 {
4859 bfd_vma roff = rel->r_offset;
4860
4861 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
4862 {
4863 /* GD->IE transition. For 64bit, change
4864 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4865 .word 0x6666; rex64; call __tls_get_addr@PLT
4866 or
4867 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
4868 .byte 0x66; rex64
4869 call *__tls_get_addr@GOTPCREL(%rip
4870 which may be converted to
4871 addr32 call __tls_get_addr
4872 into:
4873 movq %fs:0, %rax
4874 addq foo@gottpoff(%rip), %rax
4875 For 32bit, change
4876 leaq foo@tlsgd(%rip), %rdi
4877 .word 0x6666; rex64; call __tls_get_addr@PLT
4878 or
4879 leaq foo@tlsgd(%rip), %rdi
4880 .byte 0x66; rex64;
4881 call *__tls_get_addr@GOTPCREL(%rip)
4882 which may be converted to
4883 addr32 call __tls_get_addr
4884 into:
4885 movl %fs:0, %eax
4886 addq foo@gottpoff(%rip), %rax
4887 For largepic, change:
4888 leaq foo@tlsgd(%rip), %rdi
4889 movabsq $__tls_get_addr@pltoff, %rax
4890 addq %r15, %rax
4891 call *%rax
4892 into:
4893 movq %fs:0, %rax
4894 addq foo@gottpoff(%rax), %rax
4895 nopw 0x0(%rax,%rax,1) */
4896 int largepic = 0;
4897 if (ABI_64_P (output_bfd))
4898 {
4899 if (contents[roff + 5] == 0xb8)
4900 {
4901 memcpy (contents + roff - 3,
4902 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
4903 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
4904 largepic = 1;
4905 }
4906 else
4907 memcpy (contents + roff - 4,
4908 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4909 16);
4910 }
4911 else
4912 memcpy (contents + roff - 3,
4913 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
4914 15);
4915
4916 relocation = (htab->elf.sgot->output_section->vma
4917 + htab->elf.sgot->output_offset + off
4918 - roff
4919 - largepic
4920 - input_section->output_section->vma
4921 - input_section->output_offset
4922 - 12);
4923 bfd_put_32 (output_bfd, relocation,
4924 contents + roff + 8 + largepic);
4925 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
4926 rel++;
4927 wrel++;
4928 continue;
4929 }
4930 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
4931 {
4932 /* GDesc -> IE transition.
4933 It's originally something like:
4934 leaq x@tlsdesc(%rip), %rax
4935
4936 Change it to:
4937 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
4938
4939 /* Now modify the instruction as appropriate. To
4940 turn a leaq into a movq in the form we use it, it
4941 suffices to change the second byte from 0x8d to
4942 0x8b. */
4943 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4944
4945 bfd_put_32 (output_bfd,
4946 htab->elf.sgot->output_section->vma
4947 + htab->elf.sgot->output_offset + off
4948 - rel->r_offset
4949 - input_section->output_section->vma
4950 - input_section->output_offset
4951 - 4,
4952 contents + roff);
4953 continue;
4954 }
4955 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
4956 {
4957 /* GDesc -> IE transition.
4958 It's originally:
4959 call *(%rax)
4960
4961 Change it to:
4962 xchg %ax, %ax. */
4963
4964 bfd_put_8 (output_bfd, 0x66, contents + roff);
4965 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4966 continue;
4967 }
4968 else
4969 BFD_ASSERT (FALSE);
4970 }
4971 break;
4972
4973 case R_X86_64_TLSLD:
4974 if (! elf_x86_64_tls_transition (info, input_bfd,
4975 input_section, contents,
4976 symtab_hdr, sym_hashes,
4977 &r_type, GOT_UNKNOWN, rel,
4978 relend, h, r_symndx, TRUE))
4979 return FALSE;
4980
4981 if (r_type != R_X86_64_TLSLD)
4982 {
4983 /* LD->LE transition:
4984 leaq foo@tlsld(%rip), %rdi
4985 call __tls_get_addr@PLT
4986 For 64bit, we change it into:
4987 .word 0x6666; .byte 0x66; movq %fs:0, %rax
4988 For 32bit, we change it into:
4989 nopl 0x0(%rax); movl %fs:0, %eax
4990 Or
4991 leaq foo@tlsld(%rip), %rdi;
4992 call *__tls_get_addr@GOTPCREL(%rip)
4993 which may be converted to
4994 addr32 call __tls_get_addr
4995 For 64bit, we change it into:
4996 .word 0x6666; .word 0x6666; movq %fs:0, %rax
4997 For 32bit, we change it into:
4998 nopw 0x0(%rax); movl %fs:0, %eax
4999 For largepic, change:
5000 leaq foo@tlsgd(%rip), %rdi
5001 movabsq $__tls_get_addr@pltoff, %rax
5002 addq %rbx, %rax
5003 call *%rax
5004 into
5005 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
5006 movq %fs:0, %eax */
5007
5008 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
5009 if (ABI_64_P (output_bfd))
5010 {
5011 if (contents[rel->r_offset + 5] == 0xb8)
5012 memcpy (contents + rel->r_offset - 3,
5013 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
5014 "\x64\x48\x8b\x04\x25\0\0\0", 22);
5015 else if (contents[rel->r_offset + 4] == 0xff
5016 || contents[rel->r_offset + 4] == 0x67)
5017 memcpy (contents + rel->r_offset - 3,
5018 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
5019 13);
5020 else
5021 memcpy (contents + rel->r_offset - 3,
5022 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
5023 }
5024 else
5025 {
5026 if (contents[rel->r_offset + 4] == 0xff)
5027 memcpy (contents + rel->r_offset - 3,
5028 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
5029 13);
5030 else
5031 memcpy (contents + rel->r_offset - 3,
5032 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
5033 }
5034 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
5035 and R_X86_64_PLTOFF64. */
5036 rel++;
5037 wrel++;
5038 continue;
5039 }
5040
5041 if (htab->elf.sgot == NULL)
5042 abort ();
5043
5044 off = htab->tls_ld_or_ldm_got.offset;
5045 if (off & 1)
5046 off &= ~1;
5047 else
5048 {
5049 Elf_Internal_Rela outrel;
5050
5051 if (htab->elf.srelgot == NULL)
5052 abort ();
5053
5054 outrel.r_offset = (htab->elf.sgot->output_section->vma
5055 + htab->elf.sgot->output_offset + off);
5056
5057 bfd_put_64 (output_bfd, 0,
5058 htab->elf.sgot->contents + off);
5059 bfd_put_64 (output_bfd, 0,
5060 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
5061 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
5062 outrel.r_addend = 0;
5063 elf_append_rela (output_bfd, htab->elf.srelgot,
5064 &outrel);
5065 htab->tls_ld_or_ldm_got.offset |= 1;
5066 }
5067 relocation = htab->elf.sgot->output_section->vma
5068 + htab->elf.sgot->output_offset + off;
5069 unresolved_reloc = FALSE;
5070 break;
5071
5072 case R_X86_64_DTPOFF32:
5073 if (!bfd_link_executable (info)
5074 || (input_section->flags & SEC_CODE) == 0)
5075 relocation -= _bfd_x86_elf_dtpoff_base (info);
5076 else
5077 relocation = elf_x86_64_tpoff (info, relocation);
5078 break;
5079
5080 case R_X86_64_TPOFF32:
5081 case R_X86_64_TPOFF64:
5082 BFD_ASSERT (bfd_link_executable (info));
5083 relocation = elf_x86_64_tpoff (info, relocation);
5084 break;
5085
5086 case R_X86_64_DTPOFF64:
5087 BFD_ASSERT ((input_section->flags & SEC_CODE) == 0);
5088 relocation -= _bfd_x86_elf_dtpoff_base (info);
5089 break;
5090
5091 default:
5092 break;
5093 }
5094
5095 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5096 because such sections are not SEC_ALLOC and thus ld.so will
5097 not process them. */
5098 if (unresolved_reloc
5099 && !((input_section->flags & SEC_DEBUGGING) != 0
5100 && h->def_dynamic)
5101 && _bfd_elf_section_offset (output_bfd, info, input_section,
5102 rel->r_offset) != (bfd_vma) -1)
5103 {
5104 switch (r_type)
5105 {
5106 case R_X86_64_32S:
5107 sec = h->root.u.def.section;
5108 if ((info->nocopyreloc
5109 || (eh->def_protected
5110 && elf_has_no_copy_on_protected (h->root.u.def.section->owner)))
5111 && !(h->root.u.def.section->flags & SEC_CODE))
5112 return elf_x86_64_need_pic (info, input_bfd, input_section,
5113 h, NULL, NULL, howto);
5114 /* Fall through. */
5115
5116 default:
5117 _bfd_error_handler
5118 /* xgettext:c-format */
5119 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
5120 input_bfd,
5121 input_section,
5122 rel->r_offset,
5123 howto->name,
5124 h->root.root.string);
5125 return FALSE;
5126 }
5127 }
5128
5129 do_relocation:
5130 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5131 contents, rel->r_offset,
5132 relocation, rel->r_addend);
5133
5134 check_relocation_error:
5135 if (r != bfd_reloc_ok)
5136 {
5137 const char *name;
5138
5139 if (h != NULL)
5140 name = h->root.root.string;
5141 else
5142 {
5143 name = bfd_elf_string_from_elf_section (input_bfd,
5144 symtab_hdr->sh_link,
5145 sym->st_name);
5146 if (name == NULL)
5147 return FALSE;
5148 if (*name == '\0')
5149 name = bfd_section_name (input_bfd, sec);
5150 }
5151
5152 if (r == bfd_reloc_overflow)
5153 (*info->callbacks->reloc_overflow)
5154 (info, (h ? &h->root : NULL), name, howto->name,
5155 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
5156 else
5157 {
5158 _bfd_error_handler
5159 /* xgettext:c-format */
5160 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
5161 input_bfd, input_section,
5162 rel->r_offset, name, (int) r);
5163 return FALSE;
5164 }
5165 }
5166
5167 if (wrel != rel)
5168 *wrel = *rel;
5169 }
5170
5171 if (wrel != rel)
5172 {
5173 Elf_Internal_Shdr *rel_hdr;
5174 size_t deleted = rel - wrel;
5175
5176 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5177 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5178 if (rel_hdr->sh_size == 0)
5179 {
5180 /* It is too late to remove an empty reloc section. Leave
5181 one NONE reloc.
5182 ??? What is wrong with an empty section??? */
5183 rel_hdr->sh_size = rel_hdr->sh_entsize;
5184 deleted -= 1;
5185 }
5186 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5187 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5188 input_section->reloc_count -= deleted;
5189 }
5190
5191 return TRUE;
5192 }
5193
5194 /* Finish up dynamic symbol handling. We set the contents of various
5195 dynamic sections here. */
5196
5197 static bfd_boolean
5198 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
5199 struct bfd_link_info *info,
5200 struct elf_link_hash_entry *h,
5201 Elf_Internal_Sym *sym)
5202 {
5203 struct elf_x86_link_hash_table *htab;
5204 bfd_boolean use_plt_second;
5205 struct elf_x86_link_hash_entry *eh;
5206 bfd_boolean local_undefweak;
5207
5208 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
5209 if (htab == NULL)
5210 return FALSE;
5211
5212 /* Use the second PLT section only if there is .plt section. */
5213 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
5214
5215 eh = (struct elf_x86_link_hash_entry *) h;
5216 if (eh->no_finish_dynamic_symbol)
5217 abort ();
5218
5219 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5220 resolved undefined weak symbols in executable so that their
5221 references have value 0 at run-time. */
5222 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5223 X86_64_ELF_DATA,
5224 eh->has_got_reloc,
5225 eh);
5226
5227 if (h->plt.offset != (bfd_vma) -1)
5228 {
5229 bfd_vma plt_index;
5230 bfd_vma got_offset, plt_offset;
5231 Elf_Internal_Rela rela;
5232 bfd_byte *loc;
5233 asection *plt, *gotplt, *relplt, *resolved_plt;
5234 const struct elf_backend_data *bed;
5235 bfd_vma plt_got_pcrel_offset;
5236
5237 /* When building a static executable, use .iplt, .igot.plt and
5238 .rela.iplt sections for STT_GNU_IFUNC symbols. */
5239 if (htab->elf.splt != NULL)
5240 {
5241 plt = htab->elf.splt;
5242 gotplt = htab->elf.sgotplt;
5243 relplt = htab->elf.srelplt;
5244 }
5245 else
5246 {
5247 plt = htab->elf.iplt;
5248 gotplt = htab->elf.igotplt;
5249 relplt = htab->elf.irelplt;
5250 }
5251
5252 /* This symbol has an entry in the procedure linkage table. Set
5253 it up. */
5254 if ((h->dynindx == -1
5255 && !local_undefweak
5256 && !((h->forced_local || bfd_link_executable (info))
5257 && h->def_regular
5258 && h->type == STT_GNU_IFUNC))
5259 || plt == NULL
5260 || gotplt == NULL
5261 || relplt == NULL)
5262 abort ();
5263
5264 /* Get the index in the procedure linkage table which
5265 corresponds to this symbol. This is the index of this symbol
5266 in all the symbols for which we are making plt entries. The
5267 first entry in the procedure linkage table is reserved.
5268
5269 Get the offset into the .got table of the entry that
5270 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
5271 bytes. The first three are reserved for the dynamic linker.
5272
5273 For static executables, we don't reserve anything. */
5274
5275 if (plt == htab->elf.splt)
5276 {
5277 got_offset = (h->plt.offset / htab->plt.plt_entry_size
5278 - htab->plt.has_plt0);
5279 got_offset = (got_offset + 3) * GOT_ENTRY_SIZE;
5280 }
5281 else
5282 {
5283 got_offset = h->plt.offset / htab->plt.plt_entry_size;
5284 got_offset = got_offset * GOT_ENTRY_SIZE;
5285 }
5286
5287 /* Fill in the entry in the procedure linkage table. */
5288 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
5289 htab->plt.plt_entry_size);
5290 if (use_plt_second)
5291 {
5292 memcpy (htab->plt_second->contents + eh->plt_second.offset,
5293 htab->non_lazy_plt->plt_entry,
5294 htab->non_lazy_plt->plt_entry_size);
5295
5296 resolved_plt = htab->plt_second;
5297 plt_offset = eh->plt_second.offset;
5298 }
5299 else
5300 {
5301 resolved_plt = plt;
5302 plt_offset = h->plt.offset;
5303 }
5304
5305 /* Insert the relocation positions of the plt section. */
5306
5307 /* Put offset the PC-relative instruction referring to the GOT entry,
5308 subtracting the size of that instruction. */
5309 plt_got_pcrel_offset = (gotplt->output_section->vma
5310 + gotplt->output_offset
5311 + got_offset
5312 - resolved_plt->output_section->vma
5313 - resolved_plt->output_offset
5314 - plt_offset
5315 - htab->plt.plt_got_insn_size);
5316
5317 /* Check PC-relative offset overflow in PLT entry. */
5318 if ((plt_got_pcrel_offset + 0x80000000) > 0xffffffff)
5319 /* xgettext:c-format */
5320 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in PLT entry for `%s'\n"),
5321 output_bfd, h->root.root.string);
5322
5323 bfd_put_32 (output_bfd, plt_got_pcrel_offset,
5324 (resolved_plt->contents + plt_offset
5325 + htab->plt.plt_got_offset));
5326
5327 /* Fill in the entry in the global offset table, initially this
5328 points to the second part of the PLT entry. Leave the entry
5329 as zero for undefined weak symbol in PIE. No PLT relocation
5330 against undefined weak symbol in PIE. */
5331 if (!local_undefweak)
5332 {
5333 if (htab->plt.has_plt0)
5334 bfd_put_64 (output_bfd, (plt->output_section->vma
5335 + plt->output_offset
5336 + h->plt.offset
5337 + htab->lazy_plt->plt_lazy_offset),
5338 gotplt->contents + got_offset);
5339
5340 /* Fill in the entry in the .rela.plt section. */
5341 rela.r_offset = (gotplt->output_section->vma
5342 + gotplt->output_offset
5343 + got_offset);
5344 if (h->dynindx == -1
5345 || ((bfd_link_executable (info)
5346 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5347 && h->def_regular
5348 && h->type == STT_GNU_IFUNC))
5349 {
5350 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
5351 h->root.root.string,
5352 h->root.u.def.section->owner);
5353
5354 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5355 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
5356 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
5357 rela.r_addend = (h->root.u.def.value
5358 + h->root.u.def.section->output_section->vma
5359 + h->root.u.def.section->output_offset);
5360 /* R_X86_64_IRELATIVE comes last. */
5361 plt_index = htab->next_irelative_index--;
5362 }
5363 else
5364 {
5365 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
5366 rela.r_addend = 0;
5367 plt_index = htab->next_jump_slot_index++;
5368 }
5369
5370 /* Don't fill the second and third slots in PLT entry for
5371 static executables nor without PLT0. */
5372 if (plt == htab->elf.splt && htab->plt.has_plt0)
5373 {
5374 bfd_vma plt0_offset
5375 = h->plt.offset + htab->lazy_plt->plt_plt_insn_end;
5376
5377 /* Put relocation index. */
5378 bfd_put_32 (output_bfd, plt_index,
5379 (plt->contents + h->plt.offset
5380 + htab->lazy_plt->plt_reloc_offset));
5381
5382 /* Put offset for jmp .PLT0 and check for overflow. We don't
5383 check relocation index for overflow since branch displacement
5384 will overflow first. */
5385 if (plt0_offset > 0x80000000)
5386 /* xgettext:c-format */
5387 info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
5388 output_bfd, h->root.root.string);
5389 bfd_put_32 (output_bfd, - plt0_offset,
5390 (plt->contents + h->plt.offset
5391 + htab->lazy_plt->plt_plt_offset));
5392 }
5393
5394 bed = get_elf_backend_data (output_bfd);
5395 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
5396 bed->s->swap_reloca_out (output_bfd, &rela, loc);
5397 }
5398 }
5399 else if (eh->plt_got.offset != (bfd_vma) -1)
5400 {
5401 bfd_vma got_offset, plt_offset;
5402 asection *plt, *got;
5403 bfd_boolean got_after_plt;
5404 int32_t got_pcrel_offset;
5405
5406 /* Set the entry in the GOT procedure linkage table. */
5407 plt = htab->plt_got;
5408 got = htab->elf.sgot;
5409 got_offset = h->got.offset;
5410
5411 if (got_offset == (bfd_vma) -1
5412 || (h->type == STT_GNU_IFUNC && h->def_regular)
5413 || plt == NULL
5414 || got == NULL)
5415 abort ();
5416
5417 /* Use the non-lazy PLT entry template for the GOT PLT since they
5418 are the identical. */
5419 /* Fill in the entry in the GOT procedure linkage table. */
5420 plt_offset = eh->plt_got.offset;
5421 memcpy (plt->contents + plt_offset,
5422 htab->non_lazy_plt->plt_entry,
5423 htab->non_lazy_plt->plt_entry_size);
5424
5425 /* Put offset the PC-relative instruction referring to the GOT
5426 entry, subtracting the size of that instruction. */
5427 got_pcrel_offset = (got->output_section->vma
5428 + got->output_offset
5429 + got_offset
5430 - plt->output_section->vma
5431 - plt->output_offset
5432 - plt_offset
5433 - htab->non_lazy_plt->plt_got_insn_size);
5434
5435 /* Check PC-relative offset overflow in GOT PLT entry. */
5436 got_after_plt = got->output_section->vma > plt->output_section->vma;
5437 if ((got_after_plt && got_pcrel_offset < 0)
5438 || (!got_after_plt && got_pcrel_offset > 0))
5439 /* xgettext:c-format */
5440 info->callbacks->einfo (_("%F%B: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
5441 output_bfd, h->root.root.string);
5442
5443 bfd_put_32 (output_bfd, got_pcrel_offset,
5444 (plt->contents + plt_offset
5445 + htab->non_lazy_plt->plt_got_offset));
5446 }
5447
5448 if (!local_undefweak
5449 && !h->def_regular
5450 && (h->plt.offset != (bfd_vma) -1
5451 || eh->plt_got.offset != (bfd_vma) -1))
5452 {
5453 /* Mark the symbol as undefined, rather than as defined in
5454 the .plt section. Leave the value if there were any
5455 relocations where pointer equality matters (this is a clue
5456 for the dynamic linker, to make function pointer
5457 comparisons work between an application and shared
5458 library), otherwise set it to zero. If a function is only
5459 called from a binary, there is no need to slow down
5460 shared libraries because of that. */
5461 sym->st_shndx = SHN_UNDEF;
5462 if (!h->pointer_equality_needed)
5463 sym->st_value = 0;
5464 }
5465
5466 /* Don't generate dynamic GOT relocation against undefined weak
5467 symbol in executable. */
5468 if (h->got.offset != (bfd_vma) -1
5469 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h)->tls_type)
5470 && elf_x86_hash_entry (h)->tls_type != GOT_TLS_IE
5471 && !local_undefweak)
5472 {
5473 Elf_Internal_Rela rela;
5474 asection *relgot = htab->elf.srelgot;
5475
5476 /* This symbol has an entry in the global offset table. Set it
5477 up. */
5478 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5479 abort ();
5480
5481 rela.r_offset = (htab->elf.sgot->output_section->vma
5482 + htab->elf.sgot->output_offset
5483 + (h->got.offset &~ (bfd_vma) 1));
5484
5485 /* If this is a static link, or it is a -Bsymbolic link and the
5486 symbol is defined locally or was forced to be local because
5487 of a version file, we just want to emit a RELATIVE reloc.
5488 The entry in the global offset table will already have been
5489 initialized in the relocate_section function. */
5490 if (h->def_regular
5491 && h->type == STT_GNU_IFUNC)
5492 {
5493 if (h->plt.offset == (bfd_vma) -1)
5494 {
5495 /* STT_GNU_IFUNC is referenced without PLT. */
5496 if (htab->elf.splt == NULL)
5497 {
5498 /* use .rel[a].iplt section to store .got relocations
5499 in static executable. */
5500 relgot = htab->elf.irelplt;
5501 }
5502 if (SYMBOL_REFERENCES_LOCAL (info, h))
5503 {
5504 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
5505 output_bfd,
5506 h->root.root.string,
5507 h->root.u.def.section->owner);
5508
5509 rela.r_info = htab->r_info (0,
5510 R_X86_64_IRELATIVE);
5511 rela.r_addend = (h->root.u.def.value
5512 + h->root.u.def.section->output_section->vma
5513 + h->root.u.def.section->output_offset);
5514 }
5515 else
5516 goto do_glob_dat;
5517 }
5518 else if (bfd_link_pic (info))
5519 {
5520 /* Generate R_X86_64_GLOB_DAT. */
5521 goto do_glob_dat;
5522 }
5523 else
5524 {
5525 asection *plt;
5526 bfd_vma plt_offset;
5527
5528 if (!h->pointer_equality_needed)
5529 abort ();
5530
5531 /* For non-shared object, we can't use .got.plt, which
5532 contains the real function addres if we need pointer
5533 equality. We load the GOT entry with the PLT entry. */
5534 if (htab->plt_second != NULL)
5535 {
5536 plt = htab->plt_second;
5537 plt_offset = eh->plt_second.offset;
5538 }
5539 else
5540 {
5541 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5542 plt_offset = h->plt.offset;
5543 }
5544 bfd_put_64 (output_bfd, (plt->output_section->vma
5545 + plt->output_offset
5546 + plt_offset),
5547 htab->elf.sgot->contents + h->got.offset);
5548 return TRUE;
5549 }
5550 }
5551 else if (bfd_link_pic (info)
5552 && SYMBOL_REFERENCES_LOCAL (info, h))
5553 {
5554 if (!h->def_regular)
5555 return FALSE;
5556 BFD_ASSERT((h->got.offset & 1) != 0);
5557 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
5558 rela.r_addend = (h->root.u.def.value
5559 + h->root.u.def.section->output_section->vma
5560 + h->root.u.def.section->output_offset);
5561 }
5562 else
5563 {
5564 BFD_ASSERT((h->got.offset & 1) == 0);
5565 do_glob_dat:
5566 bfd_put_64 (output_bfd, (bfd_vma) 0,
5567 htab->elf.sgot->contents + h->got.offset);
5568 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
5569 rela.r_addend = 0;
5570 }
5571
5572 elf_append_rela (output_bfd, relgot, &rela);
5573 }
5574
5575 if (h->needs_copy)
5576 {
5577 Elf_Internal_Rela rela;
5578 asection *s;
5579
5580 /* This symbol needs a copy reloc. Set it up. */
5581
5582 if (h->dynindx == -1
5583 || (h->root.type != bfd_link_hash_defined
5584 && h->root.type != bfd_link_hash_defweak)
5585 || htab->elf.srelbss == NULL
5586 || htab->elf.sreldynrelro == NULL)
5587 abort ();
5588
5589 rela.r_offset = (h->root.u.def.value
5590 + h->root.u.def.section->output_section->vma
5591 + h->root.u.def.section->output_offset);
5592 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
5593 rela.r_addend = 0;
5594 if (h->root.u.def.section == htab->elf.sdynrelro)
5595 s = htab->elf.sreldynrelro;
5596 else
5597 s = htab->elf.srelbss;
5598 elf_append_rela (output_bfd, s, &rela);
5599 }
5600
5601 return TRUE;
5602 }
5603
5604 /* Finish up local dynamic symbol handling. We set the contents of
5605 various dynamic sections here. */
5606
5607 static bfd_boolean
5608 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
5609 {
5610 struct elf_link_hash_entry *h
5611 = (struct elf_link_hash_entry *) *slot;
5612 struct bfd_link_info *info
5613 = (struct bfd_link_info *) inf;
5614
5615 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5616 info, h, NULL);
5617 }
5618
5619 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5620 here since undefined weak symbol may not be dynamic and may not be
5621 called for elf_x86_64_finish_dynamic_symbol. */
5622
5623 static bfd_boolean
5624 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5625 void *inf)
5626 {
5627 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5628 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5629
5630 if (h->root.type != bfd_link_hash_undefweak
5631 || h->dynindx != -1)
5632 return TRUE;
5633
5634 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
5635 info, h, NULL);
5636 }
5637
5638 /* Used to decide how to sort relocs in an optimal manner for the
5639 dynamic linker, before writing them out. */
5640
5641 static enum elf_reloc_type_class
5642 elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
5643 const asection *rel_sec ATTRIBUTE_UNUSED,
5644 const Elf_Internal_Rela *rela)
5645 {
5646 bfd *abfd = info->output_bfd;
5647 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5648 struct elf_x86_link_hash_table *htab
5649 = elf_x86_hash_table (info, X86_64_ELF_DATA);
5650
5651 if (htab->elf.dynsym != NULL
5652 && htab->elf.dynsym->contents != NULL)
5653 {
5654 /* Check relocation against STT_GNU_IFUNC symbol if there are
5655 dynamic symbols. */
5656 unsigned long r_symndx = htab->r_sym (rela->r_info);
5657 if (r_symndx != STN_UNDEF)
5658 {
5659 Elf_Internal_Sym sym;
5660 if (!bed->s->swap_symbol_in (abfd,
5661 (htab->elf.dynsym->contents
5662 + r_symndx * bed->s->sizeof_sym),
5663 0, &sym))
5664 abort ();
5665
5666 if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5667 return reloc_class_ifunc;
5668 }
5669 }
5670
5671 switch ((int) ELF32_R_TYPE (rela->r_info))
5672 {
5673 case R_X86_64_IRELATIVE:
5674 return reloc_class_ifunc;
5675 case R_X86_64_RELATIVE:
5676 case R_X86_64_RELATIVE64:
5677 return reloc_class_relative;
5678 case R_X86_64_JUMP_SLOT:
5679 return reloc_class_plt;
5680 case R_X86_64_COPY:
5681 return reloc_class_copy;
5682 default:
5683 return reloc_class_normal;
5684 }
5685 }
5686
5687 /* Finish up the dynamic sections. */
5688
5689 static bfd_boolean
5690 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
5691 struct bfd_link_info *info)
5692 {
5693 struct elf_x86_link_hash_table *htab;
5694 bfd *dynobj;
5695 asection *sdyn;
5696
5697 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
5698 if (htab == NULL)
5699 return FALSE;
5700
5701 dynobj = htab->elf.dynobj;
5702 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5703
5704 if (htab->elf.dynamic_sections_created)
5705 {
5706 bfd_byte *dyncon, *dynconend;
5707 const struct elf_backend_data *bed;
5708 bfd_size_type sizeof_dyn;
5709
5710 if (sdyn == NULL || htab->elf.sgot == NULL)
5711 abort ();
5712
5713 bed = get_elf_backend_data (dynobj);
5714 sizeof_dyn = bed->s->sizeof_dyn;
5715 dyncon = sdyn->contents;
5716 dynconend = sdyn->contents + sdyn->size;
5717 for (; dyncon < dynconend; dyncon += sizeof_dyn)
5718 {
5719 Elf_Internal_Dyn dyn;
5720 asection *s;
5721
5722 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
5723
5724 switch (dyn.d_tag)
5725 {
5726 default:
5727 continue;
5728
5729 case DT_PLTGOT:
5730 s = htab->elf.sgotplt;
5731 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5732 break;
5733
5734 case DT_JMPREL:
5735 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
5736 break;
5737
5738 case DT_PLTRELSZ:
5739 s = htab->elf.srelplt->output_section;
5740 dyn.d_un.d_val = s->size;
5741 break;
5742
5743 case DT_TLSDESC_PLT:
5744 s = htab->elf.splt;
5745 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5746 + htab->tlsdesc_plt;
5747 break;
5748
5749 case DT_TLSDESC_GOT:
5750 s = htab->elf.sgot;
5751 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
5752 + htab->tlsdesc_got;
5753 break;
5754 }
5755
5756 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
5757 }
5758
5759 if (htab->elf.splt && htab->elf.splt->size > 0)
5760 {
5761 elf_section_data (htab->elf.splt->output_section)
5762 ->this_hdr.sh_entsize = htab->plt.plt_entry_size;
5763
5764 if (htab->plt.has_plt0)
5765 {
5766 /* Fill in the special first entry in the procedure linkage
5767 table. */
5768 memcpy (htab->elf.splt->contents,
5769 htab->lazy_plt->plt0_entry,
5770 htab->lazy_plt->plt0_entry_size);
5771 /* Add offset for pushq GOT+8(%rip), since the instruction
5772 uses 6 bytes subtract this value. */
5773 bfd_put_32 (output_bfd,
5774 (htab->elf.sgotplt->output_section->vma
5775 + htab->elf.sgotplt->output_offset
5776 + 8
5777 - htab->elf.splt->output_section->vma
5778 - htab->elf.splt->output_offset
5779 - 6),
5780 (htab->elf.splt->contents
5781 + htab->lazy_plt->plt0_got1_offset));
5782 /* Add offset for the PC-relative instruction accessing
5783 GOT+16, subtracting the offset to the end of that
5784 instruction. */
5785 bfd_put_32 (output_bfd,
5786 (htab->elf.sgotplt->output_section->vma
5787 + htab->elf.sgotplt->output_offset
5788 + 16
5789 - htab->elf.splt->output_section->vma
5790 - htab->elf.splt->output_offset
5791 - htab->lazy_plt->plt0_got2_insn_end),
5792 (htab->elf.splt->contents
5793 + htab->lazy_plt->plt0_got2_offset));
5794
5795 if (htab->tlsdesc_plt)
5796 {
5797 bfd_put_64 (output_bfd, (bfd_vma) 0,
5798 htab->elf.sgot->contents + htab->tlsdesc_got);
5799
5800 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
5801 htab->lazy_plt->plt0_entry,
5802 htab->lazy_plt->plt0_entry_size);
5803
5804 /* Add offset for pushq GOT+8(%rip), since the
5805 instruction uses 6 bytes subtract this value. */
5806 bfd_put_32 (output_bfd,
5807 (htab->elf.sgotplt->output_section->vma
5808 + htab->elf.sgotplt->output_offset
5809 + 8
5810 - htab->elf.splt->output_section->vma
5811 - htab->elf.splt->output_offset
5812 - htab->tlsdesc_plt
5813 - 6),
5814 (htab->elf.splt->contents
5815 + htab->tlsdesc_plt
5816 + htab->lazy_plt->plt0_got1_offset));
5817 /* Add offset for the PC-relative instruction accessing
5818 GOT+TDG, where TDG stands for htab->tlsdesc_got,
5819 subtracting the offset to the end of that
5820 instruction. */
5821 bfd_put_32 (output_bfd,
5822 (htab->elf.sgot->output_section->vma
5823 + htab->elf.sgot->output_offset
5824 + htab->tlsdesc_got
5825 - htab->elf.splt->output_section->vma
5826 - htab->elf.splt->output_offset
5827 - htab->tlsdesc_plt
5828 - htab->lazy_plt->plt0_got2_insn_end),
5829 (htab->elf.splt->contents
5830 + htab->tlsdesc_plt
5831 + htab->lazy_plt->plt0_got2_offset));
5832 }
5833 }
5834 }
5835
5836 if (htab->plt_got != NULL && htab->plt_got->size > 0)
5837 elf_section_data (htab->plt_got->output_section)
5838 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
5839
5840 if (htab->plt_second != NULL && htab->plt_second->size > 0)
5841 elf_section_data (htab->plt_second->output_section)
5842 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
5843 }
5844
5845 /* GOT is always created in setup_gnu_properties. But it may not be
5846 needed. */
5847 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
5848 {
5849 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5850 {
5851 _bfd_error_handler
5852 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5853 return FALSE;
5854 }
5855
5856 /* Set the first entry in the global offset table to the address of
5857 the dynamic section. */
5858 if (sdyn == NULL)
5859 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
5860 else
5861 bfd_put_64 (output_bfd,
5862 sdyn->output_section->vma + sdyn->output_offset,
5863 htab->elf.sgotplt->contents);
5864 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
5865 bfd_put_64 (output_bfd, (bfd_vma) 0,
5866 htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
5867 bfd_put_64 (output_bfd, (bfd_vma) 0,
5868 htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
5869
5870 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize
5871 = GOT_ENTRY_SIZE;
5872 }
5873
5874 /* Adjust .eh_frame for .plt section. */
5875 if (htab->plt_eh_frame != NULL
5876 && htab->plt_eh_frame->contents != NULL)
5877 {
5878 if (htab->elf.splt != NULL
5879 && htab->elf.splt->size != 0
5880 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5881 && htab->elf.splt->output_section != NULL
5882 && htab->plt_eh_frame->output_section != NULL)
5883 {
5884 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5885 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5886 + htab->plt_eh_frame->output_offset
5887 + PLT_FDE_START_OFFSET;
5888 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5889 htab->plt_eh_frame->contents
5890 + PLT_FDE_START_OFFSET);
5891 }
5892 if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5893 {
5894 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5895 htab->plt_eh_frame,
5896 htab->plt_eh_frame->contents))
5897 return FALSE;
5898 }
5899 }
5900
5901 /* Adjust .eh_frame for .plt.got section. */
5902 if (htab->plt_got_eh_frame != NULL
5903 && htab->plt_got_eh_frame->contents != NULL)
5904 {
5905 if (htab->plt_got != NULL
5906 && htab->plt_got->size != 0
5907 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
5908 && htab->plt_got->output_section != NULL
5909 && htab->plt_got_eh_frame->output_section != NULL)
5910 {
5911 bfd_vma plt_start = htab->plt_got->output_section->vma;
5912 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
5913 + htab->plt_got_eh_frame->output_offset
5914 + PLT_FDE_START_OFFSET;
5915 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5916 htab->plt_got_eh_frame->contents
5917 + PLT_FDE_START_OFFSET);
5918 }
5919 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5920 {
5921 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5922 htab->plt_got_eh_frame,
5923 htab->plt_got_eh_frame->contents))
5924 return FALSE;
5925 }
5926 }
5927
5928 /* Adjust .eh_frame for the second PLT section. */
5929 if (htab->plt_second_eh_frame != NULL
5930 && htab->plt_second_eh_frame->contents != NULL)
5931 {
5932 if (htab->plt_second != NULL
5933 && htab->plt_second->size != 0
5934 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
5935 && htab->plt_second->output_section != NULL
5936 && htab->plt_second_eh_frame->output_section != NULL)
5937 {
5938 bfd_vma plt_start = htab->plt_second->output_section->vma;
5939 bfd_vma eh_frame_start
5940 = (htab->plt_second_eh_frame->output_section->vma
5941 + htab->plt_second_eh_frame->output_offset
5942 + PLT_FDE_START_OFFSET);
5943 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5944 htab->plt_second_eh_frame->contents
5945 + PLT_FDE_START_OFFSET);
5946 }
5947 if (htab->plt_second_eh_frame->sec_info_type
5948 == SEC_INFO_TYPE_EH_FRAME)
5949 {
5950 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5951 htab->plt_second_eh_frame,
5952 htab->plt_second_eh_frame->contents))
5953 return FALSE;
5954 }
5955 }
5956
5957 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5958 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
5959 = GOT_ENTRY_SIZE;
5960
5961 /* Fill PLT entries for undefined weak symbols in PIE. */
5962 if (bfd_link_pie (info))
5963 bfd_hash_traverse (&info->hash->table,
5964 elf_x86_64_pie_finish_undefweak_symbol,
5965 info);
5966
5967 return TRUE;
5968 }
5969
5970 /* Fill PLT/GOT entries and allocate dynamic relocations for local
5971 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
5972 It has to be done before elf_link_sort_relocs is called so that
5973 dynamic relocations are properly sorted. */
5974
5975 static bfd_boolean
5976 elf_x86_64_output_arch_local_syms
5977 (bfd *output_bfd ATTRIBUTE_UNUSED,
5978 struct bfd_link_info *info,
5979 void *flaginfo ATTRIBUTE_UNUSED,
5980 int (*func) (void *, const char *,
5981 Elf_Internal_Sym *,
5982 asection *,
5983 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
5984 {
5985 struct elf_x86_link_hash_table *htab
5986 = elf_x86_hash_table (info, X86_64_ELF_DATA);
5987 if (htab == NULL)
5988 return FALSE;
5989
5990 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5991 htab_traverse (htab->loc_hash_table,
5992 elf_x86_64_finish_local_dynamic_symbol,
5993 info);
5994
5995 return TRUE;
5996 }
5997
5998 /* Forward declaration. */
5999 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt;
6000
6001 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
6002 dynamic relocations. */
6003
6004 static long
6005 elf_x86_64_get_synthetic_symtab (bfd *abfd,
6006 long symcount ATTRIBUTE_UNUSED,
6007 asymbol **syms ATTRIBUTE_UNUSED,
6008 long dynsymcount,
6009 asymbol **dynsyms,
6010 asymbol **ret)
6011 {
6012 long count, i, n;
6013 int j;
6014 bfd_byte *plt_contents;
6015 long relsize;
6016 const struct elf_x86_lazy_plt_layout *lazy_plt;
6017 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
6018 const struct elf_x86_lazy_plt_layout *lazy_bnd_plt;
6019 const struct elf_x86_non_lazy_plt_layout *non_lazy_bnd_plt;
6020 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
6021 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
6022 asection *plt;
6023 enum elf_x86_plt_type plt_type;
6024 struct elf_x86_plt plts[] =
6025 {
6026 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
6027 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
6028 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
6029 { ".plt.bnd", NULL, NULL, plt_second, 0, 0, 0, 0 },
6030 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
6031 };
6032
6033 *ret = NULL;
6034
6035 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
6036 return 0;
6037
6038 if (dynsymcount <= 0)
6039 return 0;
6040
6041 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
6042 if (relsize <= 0)
6043 return -1;
6044
6045 if (get_elf_x86_64_backend_data (abfd)->os == is_normal)
6046 {
6047 lazy_plt = &elf_x86_64_lazy_plt;
6048 non_lazy_plt = &elf_x86_64_non_lazy_plt;
6049 lazy_bnd_plt = &elf_x86_64_lazy_bnd_plt;
6050 non_lazy_bnd_plt = &elf_x86_64_non_lazy_bnd_plt;
6051 if (ABI_64_P (abfd))
6052 {
6053 lazy_ibt_plt = &elf_x86_64_lazy_ibt_plt;
6054 non_lazy_ibt_plt = &elf_x86_64_non_lazy_ibt_plt;
6055 }
6056 else
6057 {
6058 lazy_ibt_plt = &elf_x32_lazy_ibt_plt;
6059 non_lazy_ibt_plt = &elf_x32_non_lazy_ibt_plt;
6060 }
6061 }
6062 else
6063 {
6064 lazy_plt = &elf_x86_64_nacl_plt;
6065 non_lazy_plt = NULL;
6066 lazy_bnd_plt = NULL;
6067 non_lazy_bnd_plt = NULL;
6068 lazy_ibt_plt = NULL;
6069 non_lazy_ibt_plt = NULL;
6070 }
6071
6072 count = 0;
6073 for (j = 0; plts[j].name != NULL; j++)
6074 {
6075 plt = bfd_get_section_by_name (abfd, plts[j].name);
6076 if (plt == NULL || plt->size == 0)
6077 continue;
6078
6079 /* Get the PLT section contents. */
6080 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
6081 if (plt_contents == NULL)
6082 break;
6083 if (!bfd_get_section_contents (abfd, (asection *) plt,
6084 plt_contents, 0, plt->size))
6085 {
6086 free (plt_contents);
6087 break;
6088 }
6089
6090 /* Check what kind of PLT it is. */
6091 plt_type = plt_unknown;
6092 if (plts[j].type == plt_unknown
6093 && (plt->size >= (lazy_plt->plt_entry_size
6094 + lazy_plt->plt_entry_size)))
6095 {
6096 /* Match lazy PLT first. Need to check the first two
6097 instructions. */
6098 if ((memcmp (plt_contents, lazy_plt->plt0_entry,
6099 lazy_plt->plt0_got1_offset) == 0)
6100 && (memcmp (plt_contents + 6, lazy_plt->plt0_entry + 6,
6101 2) == 0))
6102 plt_type = plt_lazy;
6103 else if (lazy_bnd_plt != NULL
6104 && (memcmp (plt_contents, lazy_bnd_plt->plt0_entry,
6105 lazy_bnd_plt->plt0_got1_offset) == 0)
6106 && (memcmp (plt_contents + 6,
6107 lazy_bnd_plt->plt0_entry + 6, 3) == 0))
6108 {
6109 plt_type = plt_lazy | plt_second;
6110 /* The fist entry in the lazy IBT PLT is the same as the
6111 lazy BND PLT. */
6112 if ((memcmp (plt_contents + lazy_ibt_plt->plt_entry_size,
6113 lazy_ibt_plt->plt_entry,
6114 lazy_ibt_plt->plt_got_offset) == 0))
6115 lazy_plt = lazy_ibt_plt;
6116 else
6117 lazy_plt = lazy_bnd_plt;
6118 }
6119 }
6120
6121 if (non_lazy_plt != NULL
6122 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
6123 && plt->size >= non_lazy_plt->plt_entry_size)
6124 {
6125 /* Match non-lazy PLT. */
6126 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
6127 non_lazy_plt->plt_got_offset) == 0)
6128 plt_type = plt_non_lazy;
6129 }
6130
6131 if (plt_type == plt_unknown || plt_type == plt_second)
6132 {
6133 if (non_lazy_bnd_plt != NULL
6134 && plt->size >= non_lazy_bnd_plt->plt_entry_size
6135 && (memcmp (plt_contents, non_lazy_bnd_plt->plt_entry,
6136 non_lazy_bnd_plt->plt_got_offset) == 0))
6137 {
6138 /* Match BND PLT. */
6139 plt_type = plt_second;
6140 non_lazy_plt = non_lazy_bnd_plt;
6141 }
6142 else if (non_lazy_ibt_plt != NULL
6143 && plt->size >= non_lazy_ibt_plt->plt_entry_size
6144 && (memcmp (plt_contents,
6145 non_lazy_ibt_plt->plt_entry,
6146 non_lazy_ibt_plt->plt_got_offset) == 0))
6147 {
6148 /* Match IBT PLT. */
6149 plt_type = plt_second;
6150 non_lazy_plt = non_lazy_ibt_plt;
6151 }
6152 }
6153
6154 if (plt_type == plt_unknown)
6155 {
6156 free (plt_contents);
6157 continue;
6158 }
6159
6160 plts[j].sec = plt;
6161 plts[j].type = plt_type;
6162
6163 if ((plt_type & plt_lazy))
6164 {
6165 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
6166 plts[j].plt_got_insn_size = lazy_plt->plt_got_insn_size;
6167 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
6168 /* Skip PLT0 in lazy PLT. */
6169 i = 1;
6170 }
6171 else
6172 {
6173 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
6174 plts[j].plt_got_insn_size = non_lazy_plt->plt_got_insn_size;
6175 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
6176 i = 0;
6177 }
6178
6179 /* Skip lazy PLT when the second PLT is used. */
6180 if (plt_type == (plt_lazy | plt_second))
6181 plts[j].count = 0;
6182 else
6183 {
6184 n = plt->size / plts[j].plt_entry_size;
6185 plts[j].count = n;
6186 count += n - i;
6187 }
6188
6189 plts[j].contents = plt_contents;
6190 }
6191
6192 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
6193 (bfd_vma) 0, plts, dynsyms,
6194 ret);
6195 }
6196
6197 /* Handle an x86-64 specific section when reading an object file. This
6198 is called when elfcode.h finds a section with an unknown type. */
6199
6200 static bfd_boolean
6201 elf_x86_64_section_from_shdr (bfd *abfd, Elf_Internal_Shdr *hdr,
6202 const char *name, int shindex)
6203 {
6204 if (hdr->sh_type != SHT_X86_64_UNWIND)
6205 return FALSE;
6206
6207 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
6208 return FALSE;
6209
6210 return TRUE;
6211 }
6212
6213 /* Hook called by the linker routine which adds symbols from an object
6214 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
6215 of .bss. */
6216
6217 static bfd_boolean
6218 elf_x86_64_add_symbol_hook (bfd *abfd,
6219 struct bfd_link_info *info ATTRIBUTE_UNUSED,
6220 Elf_Internal_Sym *sym,
6221 const char **namep ATTRIBUTE_UNUSED,
6222 flagword *flagsp ATTRIBUTE_UNUSED,
6223 asection **secp,
6224 bfd_vma *valp)
6225 {
6226 asection *lcomm;
6227
6228 switch (sym->st_shndx)
6229 {
6230 case SHN_X86_64_LCOMMON:
6231 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
6232 if (lcomm == NULL)
6233 {
6234 lcomm = bfd_make_section_with_flags (abfd,
6235 "LARGE_COMMON",
6236 (SEC_ALLOC
6237 | SEC_IS_COMMON
6238 | SEC_LINKER_CREATED));
6239 if (lcomm == NULL)
6240 return FALSE;
6241 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
6242 }
6243 *secp = lcomm;
6244 *valp = sym->st_size;
6245 return TRUE;
6246 }
6247
6248 return TRUE;
6249 }
6250
6251
6252 /* Given a BFD section, try to locate the corresponding ELF section
6253 index. */
6254
6255 static bfd_boolean
6256 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
6257 asection *sec, int *index_return)
6258 {
6259 if (sec == &_bfd_elf_large_com_section)
6260 {
6261 *index_return = SHN_X86_64_LCOMMON;
6262 return TRUE;
6263 }
6264 return FALSE;
6265 }
6266
6267 /* Process a symbol. */
6268
6269 static void
6270 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
6271 asymbol *asym)
6272 {
6273 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
6274
6275 switch (elfsym->internal_elf_sym.st_shndx)
6276 {
6277 case SHN_X86_64_LCOMMON:
6278 asym->section = &_bfd_elf_large_com_section;
6279 asym->value = elfsym->internal_elf_sym.st_size;
6280 /* Common symbol doesn't set BSF_GLOBAL. */
6281 asym->flags &= ~BSF_GLOBAL;
6282 break;
6283 }
6284 }
6285
6286 static bfd_boolean
6287 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
6288 {
6289 return (sym->st_shndx == SHN_COMMON
6290 || sym->st_shndx == SHN_X86_64_LCOMMON);
6291 }
6292
6293 static unsigned int
6294 elf_x86_64_common_section_index (asection *sec)
6295 {
6296 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6297 return SHN_COMMON;
6298 else
6299 return SHN_X86_64_LCOMMON;
6300 }
6301
6302 static asection *
6303 elf_x86_64_common_section (asection *sec)
6304 {
6305 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
6306 return bfd_com_section_ptr;
6307 else
6308 return &_bfd_elf_large_com_section;
6309 }
6310
6311 static bfd_boolean
6312 elf_x86_64_merge_symbol (struct elf_link_hash_entry *h,
6313 const Elf_Internal_Sym *sym,
6314 asection **psec,
6315 bfd_boolean newdef,
6316 bfd_boolean olddef,
6317 bfd *oldbfd,
6318 const asection *oldsec)
6319 {
6320 /* A normal common symbol and a large common symbol result in a
6321 normal common symbol. We turn the large common symbol into a
6322 normal one. */
6323 if (!olddef
6324 && h->root.type == bfd_link_hash_common
6325 && !newdef
6326 && bfd_is_com_section (*psec)
6327 && oldsec != *psec)
6328 {
6329 if (sym->st_shndx == SHN_COMMON
6330 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) != 0)
6331 {
6332 h->root.u.c.p->section
6333 = bfd_make_section_old_way (oldbfd, "COMMON");
6334 h->root.u.c.p->section->flags = SEC_ALLOC;
6335 }
6336 else if (sym->st_shndx == SHN_X86_64_LCOMMON
6337 && (elf_section_flags (oldsec) & SHF_X86_64_LARGE) == 0)
6338 *psec = bfd_com_section_ptr;
6339 }
6340
6341 return TRUE;
6342 }
6343
6344 static int
6345 elf_x86_64_additional_program_headers (bfd *abfd,
6346 struct bfd_link_info *info ATTRIBUTE_UNUSED)
6347 {
6348 asection *s;
6349 int count = 0;
6350
6351 /* Check to see if we need a large readonly segment. */
6352 s = bfd_get_section_by_name (abfd, ".lrodata");
6353 if (s && (s->flags & SEC_LOAD))
6354 count++;
6355
6356 /* Check to see if we need a large data segment. Since .lbss sections
6357 is placed right after the .bss section, there should be no need for
6358 a large data segment just because of .lbss. */
6359 s = bfd_get_section_by_name (abfd, ".ldata");
6360 if (s && (s->flags & SEC_LOAD))
6361 count++;
6362
6363 return count;
6364 }
6365
6366 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
6367
6368 static bfd_boolean
6369 elf_x86_64_relocs_compatible (const bfd_target *input,
6370 const bfd_target *output)
6371 {
6372 return ((xvec_get_elf_backend_data (input)->s->elfclass
6373 == xvec_get_elf_backend_data (output)->s->elfclass)
6374 && _bfd_elf_relocs_compatible (input, output));
6375 }
6376
6377 /* Set up x86-64 GNU properties. Return the first relocatable ELF input
6378 with GNU properties if found. Otherwise, return NULL. */
6379
6380 static bfd *
6381 elf_x86_64_link_setup_gnu_properties (struct bfd_link_info *info)
6382 {
6383 bfd_boolean normal_target;
6384 bfd_boolean lazy_plt;
6385 asection *sec, *pltsec;
6386 bfd *dynobj;
6387 bfd_boolean use_ibt_plt;
6388 unsigned int plt_alignment, features;
6389 struct elf_x86_link_hash_table *htab;
6390 bfd *pbfd;
6391 bfd *ebfd = NULL;
6392 elf_property *prop;
6393
6394 features = 0;
6395 if (info->ibt)
6396 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
6397 if (info->shstk)
6398 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
6399
6400 /* Find a normal input file with GNU property note. */
6401 for (pbfd = info->input_bfds;
6402 pbfd != NULL;
6403 pbfd = pbfd->link.next)
6404 if (bfd_get_flavour (pbfd) == bfd_target_elf_flavour
6405 && bfd_count_sections (pbfd) != 0)
6406 {
6407 ebfd = pbfd;
6408
6409 if (elf_properties (pbfd) != NULL)
6410 break;
6411 }
6412
6413 if (ebfd != NULL && features)
6414 {
6415 /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and
6416 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
6417 prop = _bfd_elf_get_property (ebfd,
6418 GNU_PROPERTY_X86_FEATURE_1_AND,
6419 4);
6420 prop->u.number |= features;
6421 prop->pr_kind = property_number;
6422
6423 /* Create the GNU property note section if needed. */
6424 if (pbfd == NULL)
6425 {
6426 sec = bfd_make_section_with_flags (ebfd,
6427 NOTE_GNU_PROPERTY_SECTION_NAME,
6428 (SEC_ALLOC
6429 | SEC_LOAD
6430 | SEC_IN_MEMORY
6431 | SEC_READONLY
6432 | SEC_HAS_CONTENTS
6433 | SEC_DATA));
6434 if (sec == NULL)
6435 info->callbacks->einfo (_("%F: failed to create GNU property section\n"));
6436
6437 if (!bfd_set_section_alignment (ebfd, sec,
6438 ABI_64_P (ebfd) ? 3 : 2))
6439 {
6440 error_alignment:
6441 info->callbacks->einfo (_("%F%A: failed to align section\n"),
6442 sec);
6443 }
6444
6445 elf_section_type (sec) = SHT_NOTE;
6446 }
6447 }
6448
6449 pbfd = _bfd_elf_link_setup_gnu_properties (info);
6450
6451 if (bfd_link_relocatable (info))
6452 return pbfd;
6453
6454 htab = elf_x86_hash_table (info, X86_64_ELF_DATA);
6455 if (htab == NULL)
6456 return pbfd;
6457
6458 use_ibt_plt = info->ibtplt || info->ibt;
6459 if (!use_ibt_plt && pbfd != NULL)
6460 {
6461 /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */
6462 elf_property_list *p;
6463
6464 /* The property list is sorted in order of type. */
6465 for (p = elf_properties (pbfd); p; p = p->next)
6466 {
6467 if (GNU_PROPERTY_X86_FEATURE_1_AND == p->property.pr_type)
6468 {
6469 use_ibt_plt = !!(p->property.u.number
6470 & GNU_PROPERTY_X86_FEATURE_1_IBT);
6471 break;
6472 }
6473 else if (GNU_PROPERTY_X86_FEATURE_1_AND < p->property.pr_type)
6474 break;
6475 }
6476 }
6477
6478 dynobj = htab->elf.dynobj;
6479
6480 /* Set htab->elf.dynobj here so that there is no need to check and
6481 set it in check_relocs. */
6482 if (dynobj == NULL)
6483 {
6484 if (pbfd != NULL)
6485 {
6486 htab->elf.dynobj = pbfd;
6487 dynobj = pbfd;
6488 }
6489 else
6490 {
6491 bfd *abfd;
6492
6493 /* Find a normal input file to hold linker created
6494 sections. */
6495 for (abfd = info->input_bfds;
6496 abfd != NULL;
6497 abfd = abfd->link.next)
6498 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6499 && (abfd->flags
6500 & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0)
6501 {
6502 htab->elf.dynobj = abfd;
6503 dynobj = abfd;
6504 break;
6505 }
6506 }
6507 }
6508
6509 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
6510 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
6511 canonical function address. */
6512 htab->plt.has_plt0 = 1;
6513
6514 if (get_elf_x86_64_backend_data (info->output_bfd)->os
6515 == is_normal)
6516 {
6517 if (use_ibt_plt)
6518 {
6519 if (ABI_64_P (dynobj))
6520 {
6521 htab->lazy_plt
6522 = &elf_x86_64_lazy_ibt_plt;
6523 htab->non_lazy_plt
6524 = &elf_x86_64_non_lazy_ibt_plt;
6525 }
6526 else
6527 {
6528 htab->lazy_plt
6529 = &elf_x32_lazy_ibt_plt;
6530 htab->non_lazy_plt
6531 = &elf_x32_non_lazy_ibt_plt;
6532 }
6533 }
6534 else if (info->bndplt)
6535 {
6536 htab->lazy_plt = &elf_x86_64_lazy_bnd_plt;
6537 htab->non_lazy_plt = &elf_x86_64_non_lazy_bnd_plt;
6538 }
6539 else
6540 {
6541 htab->lazy_plt = &elf_x86_64_lazy_plt;
6542 htab->non_lazy_plt = &elf_x86_64_non_lazy_plt;
6543 }
6544 normal_target = TRUE;
6545 }
6546 else
6547 {
6548 htab->lazy_plt = &elf_x86_64_nacl_plt;
6549 htab->non_lazy_plt = NULL;
6550 normal_target = FALSE;
6551 }
6552
6553 pltsec = htab->elf.splt;
6554
6555 /* If the non-lazy PLT is available, use it for all PLT entries if
6556 there are no PLT0 or no .plt section. */
6557 if (htab->non_lazy_plt != NULL
6558 && (!htab->plt.has_plt0 || pltsec == NULL))
6559 {
6560 lazy_plt = FALSE;
6561 htab->plt.plt_entry = htab->non_lazy_plt->plt_entry;
6562 htab->plt.plt_entry_size = htab->non_lazy_plt->plt_entry_size;
6563 htab->plt.plt_got_offset = htab->non_lazy_plt->plt_got_offset;
6564 htab->plt.plt_got_insn_size
6565 = htab->non_lazy_plt->plt_got_insn_size;
6566 htab->plt.eh_frame_plt_size
6567 = htab->non_lazy_plt->eh_frame_plt_size;
6568 htab->plt.eh_frame_plt = htab->non_lazy_plt->eh_frame_plt;
6569 }
6570 else
6571 {
6572 lazy_plt = TRUE;
6573 htab->plt.plt_entry = htab->lazy_plt->plt_entry;
6574 htab->plt.plt_entry_size = htab->lazy_plt->plt_entry_size;
6575 htab->plt.plt_got_offset = htab->lazy_plt->plt_got_offset;
6576 htab->plt.plt_got_insn_size
6577 = htab->lazy_plt->plt_got_insn_size;
6578 htab->plt.eh_frame_plt_size
6579 = htab->lazy_plt->eh_frame_plt_size;
6580 htab->plt.eh_frame_plt = htab->lazy_plt->eh_frame_plt;
6581 }
6582
6583 /* This is unused for x86-64. */
6584 htab->plt.plt0_entry = NULL;
6585
6586 /* Return if there are no normal input files. */
6587 if (dynobj == NULL)
6588 return pbfd;
6589
6590 /* Since create_dynamic_sections isn't always called, but GOT
6591 relocations need GOT relocations, create them here so that we
6592 don't need to do it in check_relocs. */
6593 if (htab->elf.sgot == NULL
6594 && !_bfd_elf_create_got_section (dynobj, info))
6595 info->callbacks->einfo (_("%F: failed to create GOT sections\n"));
6596
6597 /* Align .got and .got.plt sections to their entry size. Do it here
6598 instead of in create_dynamic_sections so that they are always
6599 properly aligned even if create_dynamic_sections isn't called. */
6600 sec = htab->elf.sgot;
6601 if (!bfd_set_section_alignment (dynobj, sec, 3))
6602 goto error_alignment;
6603
6604 sec = htab->elf.sgotplt;
6605 if (!bfd_set_section_alignment (dynobj, sec, 3))
6606 goto error_alignment;
6607
6608 /* Create the ifunc sections here so that check_relocs can be
6609 simplified. */
6610 if (!_bfd_elf_create_ifunc_sections (dynobj, info))
6611 info->callbacks->einfo (_("%F: failed to create ifunc sections\n"));
6612
6613 plt_alignment = bfd_log2 (htab->plt.plt_entry_size);
6614
6615 if (pltsec != NULL)
6616 {
6617 /* Whe creating executable, set the contents of the .interp
6618 section to the interpreter. */
6619 if (bfd_link_executable (info) && !info->nointerp)
6620 {
6621 asection *s = bfd_get_linker_section (dynobj, ".interp");
6622 if (s == NULL)
6623 abort ();
6624 s->size = htab->dynamic_interpreter_size;
6625 s->contents = (unsigned char *) htab->dynamic_interpreter;
6626 htab->interp = s;
6627 }
6628
6629 /* Don't change PLT section alignment for NaCl since it uses
6630 64-byte PLT entry and sets PLT section alignment to 32
6631 bytes. Don't create additional PLT sections for NaCl. */
6632 if (normal_target)
6633 {
6634 const struct elf_backend_data *bed
6635 = get_elf_backend_data (dynobj);
6636 flagword pltflags = (bed->dynamic_sec_flags
6637 | SEC_ALLOC
6638 | SEC_CODE
6639 | SEC_LOAD
6640 | SEC_READONLY);
6641 unsigned int non_lazy_plt_alignment
6642 = bfd_log2 (htab->non_lazy_plt->plt_entry_size);
6643
6644 sec = pltsec;
6645 if (!bfd_set_section_alignment (sec->owner, sec,
6646 plt_alignment))
6647 goto error_alignment;
6648
6649 /* Create the GOT procedure linkage table. */
6650 sec = bfd_make_section_anyway_with_flags (dynobj,
6651 ".plt.got",
6652 pltflags);
6653 if (sec == NULL)
6654 info->callbacks->einfo (_("%F: failed to create GOT PLT section\n"));
6655
6656 if (!bfd_set_section_alignment (dynobj, sec,
6657 non_lazy_plt_alignment))
6658 goto error_alignment;
6659
6660 htab->plt_got = sec;
6661
6662 if (lazy_plt)
6663 {
6664 sec = NULL;
6665
6666 if (use_ibt_plt)
6667 {
6668 /* Create the second PLT for Intel IBT support. IBT
6669 PLT is supported only for non-NaCl target and is
6670 is needed only for lazy binding. */
6671 sec = bfd_make_section_anyway_with_flags (dynobj,
6672 ".plt.sec",
6673 pltflags);
6674 if (sec == NULL)
6675 info->callbacks->einfo (_("%F: failed to create IBT-enabled PLT section\n"));
6676
6677 if (!bfd_set_section_alignment (dynobj, sec,
6678 plt_alignment))
6679 goto error_alignment;
6680 }
6681 else if (info->bndplt && ABI_64_P (dynobj))
6682 {
6683 /* Create the second PLT for Intel MPX support. MPX
6684 PLT is supported only for non-NaCl target in 64-bit
6685 mode and is needed only for lazy binding. */
6686 sec = bfd_make_section_anyway_with_flags (dynobj,
6687 ".plt.sec",
6688 pltflags);
6689 if (sec == NULL)
6690 info->callbacks->einfo (_("%F: failed to create BND PLT section\n"));
6691
6692 if (!bfd_set_section_alignment (dynobj, sec,
6693 non_lazy_plt_alignment))
6694 goto error_alignment;
6695 }
6696
6697 htab->plt_second = sec;
6698 }
6699 }
6700
6701 if (!info->no_ld_generated_unwind_info)
6702 {
6703 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
6704 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
6705 | SEC_LINKER_CREATED);
6706
6707 sec = bfd_make_section_anyway_with_flags (dynobj,
6708 ".eh_frame",
6709 flags);
6710 if (sec == NULL)
6711 info->callbacks->einfo (_("%F: failed to create PLT .eh_frame section\n"));
6712
6713 if (!bfd_set_section_alignment (dynobj, sec,
6714 ABI_64_P (dynobj) ? 3 : 2))
6715 goto error_alignment;
6716
6717 htab->plt_eh_frame = sec;
6718
6719 if (htab->plt_got != NULL)
6720 {
6721 sec = bfd_make_section_anyway_with_flags (dynobj,
6722 ".eh_frame",
6723 flags);
6724 if (sec == NULL)
6725 info->callbacks->einfo (_("%F: failed to create GOT PLT .eh_frame section\n"));
6726
6727 if (!bfd_set_section_alignment (dynobj, sec,
6728 ABI_64_P (dynobj) ? 3 : 2))
6729 goto error_alignment;
6730
6731 htab->plt_got_eh_frame = sec;
6732 }
6733
6734 if (htab->plt_second != NULL)
6735 {
6736 sec = bfd_make_section_anyway_with_flags (dynobj,
6737 ".eh_frame",
6738 flags);
6739 if (sec == NULL)
6740 info->callbacks->einfo (_("%F: failed to create BND PLT .eh_frame section\n"));
6741
6742 if (!bfd_set_section_alignment (dynobj, sec, 3))
6743 goto error_alignment;
6744
6745 htab->plt_second_eh_frame = sec;
6746 }
6747 }
6748 }
6749
6750 if (normal_target)
6751 {
6752 /* The .iplt section is used for IFUNC symbols in static
6753 executables. */
6754 sec = htab->elf.iplt;
6755 if (sec != NULL
6756 && !bfd_set_section_alignment (sec->owner, sec,
6757 plt_alignment))
6758 goto error_alignment;
6759 }
6760
6761 return pbfd;
6762 }
6763
6764 static const struct bfd_elf_special_section
6765 elf_x86_64_special_sections[]=
6766 {
6767 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6768 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6769 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
6770 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6771 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
6772 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
6773 { NULL, 0, 0, 0, 0 }
6774 };
6775
6776 #define TARGET_LITTLE_SYM x86_64_elf64_vec
6777 #define TARGET_LITTLE_NAME "elf64-x86-64"
6778 #define ELF_ARCH bfd_arch_i386
6779 #define ELF_TARGET_ID X86_64_ELF_DATA
6780 #define ELF_MACHINE_CODE EM_X86_64
6781 #define ELF_MAXPAGESIZE 0x200000
6782 #define ELF_MINPAGESIZE 0x1000
6783 #define ELF_COMMONPAGESIZE 0x1000
6784
6785 #define elf_backend_can_gc_sections 1
6786 #define elf_backend_can_refcount 1
6787 #define elf_backend_want_got_plt 1
6788 #define elf_backend_plt_readonly 1
6789 #define elf_backend_want_plt_sym 0
6790 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
6791 #define elf_backend_rela_normal 1
6792 #define elf_backend_plt_alignment 4
6793 #define elf_backend_extern_protected_data 1
6794 #define elf_backend_caches_rawsize 1
6795 #define elf_backend_dtrel_excludes_plt 1
6796 #define elf_backend_want_dynrelro 1
6797
6798 #define elf_info_to_howto elf_x86_64_info_to_howto
6799
6800 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
6801 #define bfd_elf64_bfd_reloc_name_lookup \
6802 elf_x86_64_reloc_name_lookup
6803
6804 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
6805 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
6806 #define elf_backend_check_relocs elf_x86_64_check_relocs
6807 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
6808 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
6809 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
6810 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
6811 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
6812 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
6813 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
6814 #ifdef CORE_HEADER
6815 #define elf_backend_write_core_note elf_x86_64_write_core_note
6816 #endif
6817 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
6818 #define elf_backend_relocate_section elf_x86_64_relocate_section
6819 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
6820 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
6821 #define elf_backend_object_p elf64_x86_64_elf_object_p
6822 #define bfd_elf64_mkobject elf_x86_64_mkobject
6823 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
6824
6825 #define elf_backend_section_from_shdr \
6826 elf_x86_64_section_from_shdr
6827
6828 #define elf_backend_section_from_bfd_section \
6829 elf_x86_64_elf_section_from_bfd_section
6830 #define elf_backend_add_symbol_hook \
6831 elf_x86_64_add_symbol_hook
6832 #define elf_backend_symbol_processing \
6833 elf_x86_64_symbol_processing
6834 #define elf_backend_common_section_index \
6835 elf_x86_64_common_section_index
6836 #define elf_backend_common_section \
6837 elf_x86_64_common_section
6838 #define elf_backend_common_definition \
6839 elf_x86_64_common_definition
6840 #define elf_backend_merge_symbol \
6841 elf_x86_64_merge_symbol
6842 #define elf_backend_special_sections \
6843 elf_x86_64_special_sections
6844 #define elf_backend_additional_program_headers \
6845 elf_x86_64_additional_program_headers
6846 #define elf_backend_setup_gnu_properties \
6847 elf_x86_64_link_setup_gnu_properties
6848
6849 #include "elf64-target.h"
6850
6851 /* CloudABI support. */
6852
6853 #undef TARGET_LITTLE_SYM
6854 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
6855 #undef TARGET_LITTLE_NAME
6856 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
6857
6858 #undef ELF_OSABI
6859 #define ELF_OSABI ELFOSABI_CLOUDABI
6860
6861 #undef elf64_bed
6862 #define elf64_bed elf64_x86_64_cloudabi_bed
6863
6864 #include "elf64-target.h"
6865
6866 /* FreeBSD support. */
6867
6868 #undef TARGET_LITTLE_SYM
6869 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
6870 #undef TARGET_LITTLE_NAME
6871 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
6872
6873 #undef ELF_OSABI
6874 #define ELF_OSABI ELFOSABI_FREEBSD
6875
6876 #undef elf64_bed
6877 #define elf64_bed elf64_x86_64_fbsd_bed
6878
6879 #include "elf64-target.h"
6880
6881 /* Solaris 2 support. */
6882
6883 #undef TARGET_LITTLE_SYM
6884 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
6885 #undef TARGET_LITTLE_NAME
6886 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
6887
6888 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6889 objects won't be recognized. */
6890 #undef ELF_OSABI
6891
6892 #undef elf64_bed
6893 #define elf64_bed elf64_x86_64_sol2_bed
6894
6895 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
6896 boundary. */
6897 #undef elf_backend_static_tls_alignment
6898 #define elf_backend_static_tls_alignment 16
6899
6900 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6901
6902 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6903 File, p.63. */
6904 #undef elf_backend_want_plt_sym
6905 #define elf_backend_want_plt_sym 1
6906
6907 #undef elf_backend_strtab_flags
6908 #define elf_backend_strtab_flags SHF_STRINGS
6909
6910 static bfd_boolean
6911 elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
6912 bfd *obfd ATTRIBUTE_UNUSED,
6913 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
6914 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
6915 {
6916 /* PR 19938: FIXME: Need to add code for setting the sh_info
6917 and sh_link fields of Solaris specific section types. */
6918 return FALSE;
6919 }
6920
6921 #undef elf_backend_copy_special_section_fields
6922 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
6923
6924 #include "elf64-target.h"
6925
6926 /* Native Client support. */
6927
6928 static bfd_boolean
6929 elf64_x86_64_nacl_elf_object_p (bfd *abfd)
6930 {
6931 /* Set the right machine number for a NaCl x86-64 ELF64 file. */
6932 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64_nacl);
6933 return TRUE;
6934 }
6935
6936 #undef TARGET_LITTLE_SYM
6937 #define TARGET_LITTLE_SYM x86_64_elf64_nacl_vec
6938 #undef TARGET_LITTLE_NAME
6939 #define TARGET_LITTLE_NAME "elf64-x86-64-nacl"
6940 #undef elf64_bed
6941 #define elf64_bed elf64_x86_64_nacl_bed
6942
6943 #undef ELF_MAXPAGESIZE
6944 #undef ELF_MINPAGESIZE
6945 #undef ELF_COMMONPAGESIZE
6946 #define ELF_MAXPAGESIZE 0x10000
6947 #define ELF_MINPAGESIZE 0x10000
6948 #define ELF_COMMONPAGESIZE 0x10000
6949
6950 /* Restore defaults. */
6951 #undef ELF_OSABI
6952 #undef elf_backend_static_tls_alignment
6953 #undef elf_backend_want_plt_sym
6954 #define elf_backend_want_plt_sym 0
6955 #undef elf_backend_strtab_flags
6956 #undef elf_backend_copy_special_section_fields
6957
6958 /* NaCl uses substantially different PLT entries for the same effects. */
6959
6960 #undef elf_backend_plt_alignment
6961 #define elf_backend_plt_alignment 5
6962 #define NACL_PLT_ENTRY_SIZE 64
6963 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6964
6965 static const bfd_byte elf_x86_64_nacl_plt0_entry[NACL_PLT_ENTRY_SIZE] =
6966 {
6967 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
6968 0x4c, 0x8b, 0x1d, 16, 0, 0, 0, /* mov GOT+16(%rip), %r11 */
6969 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6970 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6971 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6972
6973 /* 9-byte nop sequence to pad out to the next 32-byte boundary. */
6974 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
6975
6976 /* 32 bytes of nop to pad out to the standard size. */
6977 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
6978 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6979 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
6980 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6981 0x66, /* excess data16 prefix */
6982 0x90 /* nop */
6983 };
6984
6985 static const bfd_byte elf_x86_64_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6986 {
6987 0x4c, 0x8b, 0x1d, 0, 0, 0, 0, /* mov name@GOTPCREL(%rip),%r11 */
6988 0x41, 0x83, 0xe3, NACLMASK, /* and $-32, %r11d */
6989 0x4d, 0x01, 0xfb, /* add %r15, %r11 */
6990 0x41, 0xff, 0xe3, /* jmpq *%r11 */
6991
6992 /* 15-byte nop sequence to pad out to the next 32-byte boundary. */
6993 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
6994 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
6995
6996 /* Lazy GOT entries point here (32-byte aligned). */
6997 0x68, /* pushq immediate */
6998 0, 0, 0, 0, /* replaced with index into relocation table. */
6999 0xe9, /* jmp relative */
7000 0, 0, 0, 0, /* replaced with offset to start of .plt0. */
7001
7002 /* 22 bytes of nop to pad out to the standard size. */
7003 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
7004 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
7005 0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
7006 };
7007
7008 /* .eh_frame covering the .plt section. */
7009
7010 static const bfd_byte elf_x86_64_nacl_eh_frame_plt[] =
7011 {
7012 #if (PLT_CIE_LENGTH != 20 \
7013 || PLT_FDE_LENGTH != 36 \
7014 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
7015 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
7016 # error "Need elf_x86_64_backend_data parameters for eh_frame_plt offsets!"
7017 #endif
7018 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
7019 0, 0, 0, 0, /* CIE ID */
7020 1, /* CIE version */
7021 'z', 'R', 0, /* Augmentation string */
7022 1, /* Code alignment factor */
7023 0x78, /* Data alignment factor */
7024 16, /* Return address column */
7025 1, /* Augmentation size */
7026 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
7027 DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
7028 DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
7029 DW_CFA_nop, DW_CFA_nop,
7030
7031 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
7032 PLT_CIE_LENGTH + 8, 0, 0, 0,/* CIE pointer */
7033 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
7034 0, 0, 0, 0, /* .plt size goes here */
7035 0, /* Augmentation size */
7036 DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
7037 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
7038 DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
7039 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
7040 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
7041 13, /* Block length */
7042 DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
7043 DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
7044 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
7045 DW_OP_lit3, DW_OP_shl, DW_OP_plus,
7046 DW_CFA_nop, DW_CFA_nop
7047 };
7048
7049 static const struct elf_x86_lazy_plt_layout elf_x86_64_nacl_plt =
7050 {
7051 elf_x86_64_nacl_plt0_entry, /* plt0_entry */
7052 NACL_PLT_ENTRY_SIZE, /* plt0_entry_size */
7053 elf_x86_64_nacl_plt_entry, /* plt_entry */
7054 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
7055 2, /* plt0_got1_offset */
7056 9, /* plt0_got2_offset */
7057 13, /* plt0_got2_insn_end */
7058 3, /* plt_got_offset */
7059 33, /* plt_reloc_offset */
7060 38, /* plt_plt_offset */
7061 7, /* plt_got_insn_size */
7062 42, /* plt_plt_insn_end */
7063 32, /* plt_lazy_offset */
7064 NULL, /* pic_plt0_entry */
7065 NULL, /* pic_plt_entry */
7066 elf_x86_64_nacl_eh_frame_plt, /* eh_frame_plt */
7067 sizeof (elf_x86_64_nacl_eh_frame_plt) /* eh_frame_plt_size */
7068 };
7069
7070 static const struct elf_x86_64_backend_data elf_x86_64_nacl_arch_bed =
7071 {
7072 is_nacl /* os */
7073 };
7074
7075 #undef elf_backend_arch_data
7076 #define elf_backend_arch_data &elf_x86_64_nacl_arch_bed
7077
7078 #undef elf_backend_object_p
7079 #define elf_backend_object_p elf64_x86_64_nacl_elf_object_p
7080 #undef elf_backend_modify_segment_map
7081 #define elf_backend_modify_segment_map nacl_modify_segment_map
7082 #undef elf_backend_modify_program_headers
7083 #define elf_backend_modify_program_headers nacl_modify_program_headers
7084 #undef elf_backend_final_write_processing
7085 #define elf_backend_final_write_processing nacl_final_write_processing
7086
7087 #include "elf64-target.h"
7088
7089 /* Native Client x32 support. */
7090
7091 static bfd_boolean
7092 elf32_x86_64_nacl_elf_object_p (bfd *abfd)
7093 {
7094 /* Set the right machine number for a NaCl x86-64 ELF32 file. */
7095 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32_nacl);
7096 return TRUE;
7097 }
7098
7099 #undef TARGET_LITTLE_SYM
7100 #define TARGET_LITTLE_SYM x86_64_elf32_nacl_vec
7101 #undef TARGET_LITTLE_NAME
7102 #define TARGET_LITTLE_NAME "elf32-x86-64-nacl"
7103 #undef elf32_bed
7104 #define elf32_bed elf32_x86_64_nacl_bed
7105
7106 #define bfd_elf32_bfd_reloc_type_lookup \
7107 elf_x86_64_reloc_type_lookup
7108 #define bfd_elf32_bfd_reloc_name_lookup \
7109 elf_x86_64_reloc_name_lookup
7110 #define bfd_elf32_mkobject \
7111 elf_x86_64_mkobject
7112 #define bfd_elf32_get_synthetic_symtab \
7113 elf_x86_64_get_synthetic_symtab
7114
7115 #undef elf_backend_object_p
7116 #define elf_backend_object_p \
7117 elf32_x86_64_nacl_elf_object_p
7118
7119 #undef elf_backend_bfd_from_remote_memory
7120 #define elf_backend_bfd_from_remote_memory \
7121 _bfd_elf32_bfd_from_remote_memory
7122
7123 #undef elf_backend_size_info
7124 #define elf_backend_size_info \
7125 _bfd_elf32_size_info
7126
7127 #include "elf32-target.h"
7128
7129 /* Restore defaults. */
7130 #undef elf_backend_object_p
7131 #define elf_backend_object_p elf64_x86_64_elf_object_p
7132 #undef elf_backend_bfd_from_remote_memory
7133 #undef elf_backend_size_info
7134 #undef elf_backend_modify_segment_map
7135 #undef elf_backend_modify_program_headers
7136 #undef elf_backend_final_write_processing
7137
7138 /* Intel L1OM support. */
7139
7140 static bfd_boolean
7141 elf64_l1om_elf_object_p (bfd *abfd)
7142 {
7143 /* Set the right machine number for an L1OM elf64 file. */
7144 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
7145 return TRUE;
7146 }
7147
7148 #undef TARGET_LITTLE_SYM
7149 #define TARGET_LITTLE_SYM l1om_elf64_vec
7150 #undef TARGET_LITTLE_NAME
7151 #define TARGET_LITTLE_NAME "elf64-l1om"
7152 #undef ELF_ARCH
7153 #define ELF_ARCH bfd_arch_l1om
7154
7155 #undef ELF_MACHINE_CODE
7156 #define ELF_MACHINE_CODE EM_L1OM
7157
7158 #undef ELF_OSABI
7159
7160 #undef elf64_bed
7161 #define elf64_bed elf64_l1om_bed
7162
7163 #undef elf_backend_object_p
7164 #define elf_backend_object_p elf64_l1om_elf_object_p
7165
7166 /* Restore defaults. */
7167 #undef ELF_MAXPAGESIZE
7168 #undef ELF_MINPAGESIZE
7169 #undef ELF_COMMONPAGESIZE
7170 #define ELF_MAXPAGESIZE 0x200000
7171 #define ELF_MINPAGESIZE 0x1000
7172 #define ELF_COMMONPAGESIZE 0x1000
7173 #undef elf_backend_plt_alignment
7174 #define elf_backend_plt_alignment 4
7175 #undef elf_backend_arch_data
7176 #define elf_backend_arch_data &elf_x86_64_arch_bed
7177
7178 #include "elf64-target.h"
7179
7180 /* FreeBSD L1OM support. */
7181
7182 #undef TARGET_LITTLE_SYM
7183 #define TARGET_LITTLE_SYM l1om_elf64_fbsd_vec
7184 #undef TARGET_LITTLE_NAME
7185 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
7186
7187 #undef ELF_OSABI
7188 #define ELF_OSABI ELFOSABI_FREEBSD
7189
7190 #undef elf64_bed
7191 #define elf64_bed elf64_l1om_fbsd_bed
7192
7193 #include "elf64-target.h"
7194
7195 /* Intel K1OM support. */
7196
7197 static bfd_boolean
7198 elf64_k1om_elf_object_p (bfd *abfd)
7199 {
7200 /* Set the right machine number for an K1OM elf64 file. */
7201 bfd_default_set_arch_mach (abfd, bfd_arch_k1om, bfd_mach_k1om);
7202 return TRUE;
7203 }
7204
7205 #undef TARGET_LITTLE_SYM
7206 #define TARGET_LITTLE_SYM k1om_elf64_vec
7207 #undef TARGET_LITTLE_NAME
7208 #define TARGET_LITTLE_NAME "elf64-k1om"
7209 #undef ELF_ARCH
7210 #define ELF_ARCH bfd_arch_k1om
7211
7212 #undef ELF_MACHINE_CODE
7213 #define ELF_MACHINE_CODE EM_K1OM
7214
7215 #undef ELF_OSABI
7216
7217 #undef elf64_bed
7218 #define elf64_bed elf64_k1om_bed
7219
7220 #undef elf_backend_object_p
7221 #define elf_backend_object_p elf64_k1om_elf_object_p
7222
7223 #undef elf_backend_static_tls_alignment
7224
7225 #undef elf_backend_want_plt_sym
7226 #define elf_backend_want_plt_sym 0
7227
7228 #include "elf64-target.h"
7229
7230 /* FreeBSD K1OM support. */
7231
7232 #undef TARGET_LITTLE_SYM
7233 #define TARGET_LITTLE_SYM k1om_elf64_fbsd_vec
7234 #undef TARGET_LITTLE_NAME
7235 #define TARGET_LITTLE_NAME "elf64-k1om-freebsd"
7236
7237 #undef ELF_OSABI
7238 #define ELF_OSABI ELFOSABI_FREEBSD
7239
7240 #undef elf64_bed
7241 #define elf64_bed elf64_k1om_fbsd_bed
7242
7243 #include "elf64-target.h"
7244
7245 /* 32bit x86-64 support. */
7246
7247 #undef TARGET_LITTLE_SYM
7248 #define TARGET_LITTLE_SYM x86_64_elf32_vec
7249 #undef TARGET_LITTLE_NAME
7250 #define TARGET_LITTLE_NAME "elf32-x86-64"
7251 #undef elf32_bed
7252
7253 #undef ELF_ARCH
7254 #define ELF_ARCH bfd_arch_i386
7255
7256 #undef ELF_MACHINE_CODE
7257 #define ELF_MACHINE_CODE EM_X86_64
7258
7259 #undef ELF_OSABI
7260
7261 #undef elf_backend_object_p
7262 #define elf_backend_object_p \
7263 elf32_x86_64_elf_object_p
7264
7265 #undef elf_backend_bfd_from_remote_memory
7266 #define elf_backend_bfd_from_remote_memory \
7267 _bfd_elf32_bfd_from_remote_memory
7268
7269 #undef elf_backend_size_info
7270 #define elf_backend_size_info \
7271 _bfd_elf32_size_info
7272
7273 #include "elf32-target.h"
GDB Binutils - Deliverables
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