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PR ld/13258
[binutils.git] / bfd / elf64-x86-64.c
blobceb1a0a19a3949827396ea00a62ce83e610328f1
1 /* X86-64 specific support for ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2010 Free Software Foundation, Inc.
4 Contributed by Jan Hubicka <jh@suse.cz>.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31
32 #include "elf/x86-64.h"
33
34 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
35 #define MINUS_ONE (~ (bfd_vma) 0)
36
37 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
38 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
39 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
40 since they are the same. */
41
42 #define ABI_64_P(abfd) \
43 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
44
45 /* The relocation "howto" table. Order of fields:
46 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
47 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
48 static reloc_howto_type x86_64_elf_howto_table[] =
49 {
50 HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
51 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
52 FALSE),
53 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
55 FALSE),
56 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
57 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
58 TRUE),
59 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
60 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
61 FALSE),
62 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
63 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
64 TRUE),
65 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
67 FALSE),
68 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
70 MINUS_ONE, FALSE),
71 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
73 MINUS_ONE, FALSE),
74 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
75 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
76 MINUS_ONE, FALSE),
77 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
78 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
79 0xffffffff, TRUE),
80 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
81 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
82 FALSE),
83 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
84 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
85 FALSE),
86 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
88 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
90 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
92 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
93 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
94 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
96 MINUS_ONE, FALSE),
97 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
99 MINUS_ONE, FALSE),
100 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
102 MINUS_ONE, FALSE),
103 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
105 0xffffffff, TRUE),
106 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
107 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
108 0xffffffff, TRUE),
109 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
110 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
111 0xffffffff, FALSE),
112 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
113 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
114 0xffffffff, TRUE),
115 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
116 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
117 0xffffffff, FALSE),
118 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
120 TRUE),
121 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
123 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
124 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
125 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
126 FALSE, 0xffffffff, 0xffffffff, TRUE),
127 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
128 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
129 FALSE),
130 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
131 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
132 MINUS_ONE, TRUE),
133 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
134 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
135 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
136 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
137 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
138 MINUS_ONE, FALSE),
139 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
140 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
141 MINUS_ONE, FALSE),
142 EMPTY_HOWTO (32),
143 EMPTY_HOWTO (33),
144 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
145 complain_overflow_bitfield, bfd_elf_generic_reloc,
146 "R_X86_64_GOTPC32_TLSDESC",
147 FALSE, 0xffffffff, 0xffffffff, TRUE),
148 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
149 complain_overflow_dont, bfd_elf_generic_reloc,
150 "R_X86_64_TLSDESC_CALL",
151 FALSE, 0, 0, FALSE),
152 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
153 complain_overflow_bitfield, bfd_elf_generic_reloc,
154 "R_X86_64_TLSDESC",
155 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
156 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
157 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
158 MINUS_ONE, FALSE),
159
160 /* We have a gap in the reloc numbers here.
161 R_X86_64_standard counts the number up to this point, and
162 R_X86_64_vt_offset is the value to subtract from a reloc type of
163 R_X86_64_GNU_VT* to form an index into this table. */
164 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
165 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
166
167 /* GNU extension to record C++ vtable hierarchy. */
168 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
169 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
170
171 /* GNU extension to record C++ vtable member usage. */
172 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
173 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
174 FALSE)
175 };
176
177 #define IS_X86_64_PCREL_TYPE(TYPE) \
178 ( ((TYPE) == R_X86_64_PC8) \
179 || ((TYPE) == R_X86_64_PC16) \
180 || ((TYPE) == R_X86_64_PC32) \
181 || ((TYPE) == R_X86_64_PC64))
182
183 /* Map BFD relocs to the x86_64 elf relocs. */
184 struct elf_reloc_map
185 {
186 bfd_reloc_code_real_type bfd_reloc_val;
187 unsigned char elf_reloc_val;
188 };
189
190 static const struct elf_reloc_map x86_64_reloc_map[] =
191 {
192 { BFD_RELOC_NONE, R_X86_64_NONE, },
193 { BFD_RELOC_64, R_X86_64_64, },
194 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
195 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
196 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
197 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
198 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
199 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
200 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
201 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
202 { BFD_RELOC_32, R_X86_64_32, },
203 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
204 { BFD_RELOC_16, R_X86_64_16, },
205 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
206 { BFD_RELOC_8, R_X86_64_8, },
207 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
208 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
209 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
210 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
211 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
212 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
213 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
214 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
215 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
216 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
217 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
218 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
219 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
220 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
221 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
222 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
223 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
224 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
225 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
226 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
227 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
228 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
229 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
230 };
231
232 static reloc_howto_type *
233 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
234 {
235 unsigned i;
236
237 if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
238 || r_type >= (unsigned int) R_X86_64_max)
239 {
240 if (r_type >= (unsigned int) R_X86_64_standard)
241 {
242 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
243 abfd, (int) r_type);
244 r_type = R_X86_64_NONE;
245 }
246 i = r_type;
247 }
248 else
249 i = r_type - (unsigned int) R_X86_64_vt_offset;
250 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
251 return &x86_64_elf_howto_table[i];
252 }
253
254 /* Given a BFD reloc type, return a HOWTO structure. */
255 static reloc_howto_type *
256 elf_x86_64_reloc_type_lookup (bfd *abfd,
257 bfd_reloc_code_real_type code)
258 {
259 unsigned int i;
260
261 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
262 i++)
263 {
264 if (x86_64_reloc_map[i].bfd_reloc_val == code)
265 return elf_x86_64_rtype_to_howto (abfd,
266 x86_64_reloc_map[i].elf_reloc_val);
267 }
268 return 0;
269 }
270
271 static reloc_howto_type *
272 elf_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
273 const char *r_name)
274 {
275 unsigned int i;
276
277 for (i = 0;
278 i < (sizeof (x86_64_elf_howto_table)
279 / sizeof (x86_64_elf_howto_table[0]));
280 i++)
281 if (x86_64_elf_howto_table[i].name != NULL
282 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
283 return &x86_64_elf_howto_table[i];
284
285 return NULL;
286 }
287
288 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
289
290 static void
291 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
292 Elf_Internal_Rela *dst)
293 {
294 unsigned r_type;
295
296 r_type = ELF32_R_TYPE (dst->r_info);
297 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
298 BFD_ASSERT (r_type == cache_ptr->howto->type);
299 }
300 \f
301 /* Support for core dump NOTE sections. */
302 static bfd_boolean
303 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
304 {
305 int offset;
306 size_t size;
307
308 switch (note->descsz)
309 {
310 default:
311 return FALSE;
312
313 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
314 /* pr_cursig */
315 elf_tdata (abfd)->core_signal
316 = bfd_get_16 (abfd, note->descdata + 12);
317
318 /* pr_pid */
319 elf_tdata (abfd)->core_lwpid
320 = bfd_get_32 (abfd, note->descdata + 32);
321
322 /* pr_reg */
323 offset = 112;
324 size = 216;
325
326 break;
327 }
328
329 /* Make a ".reg/999" section. */
330 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
331 size, note->descpos + offset);
332 }
333
334 static bfd_boolean
335 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
336 {
337 switch (note->descsz)
338 {
339 default:
340 return FALSE;
341
342 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
343 elf_tdata (abfd)->core_pid
344 = bfd_get_32 (abfd, note->descdata + 24);
345 elf_tdata (abfd)->core_program
346 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
347 elf_tdata (abfd)->core_command
348 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
349 }
350
351 /* Note that for some reason, a spurious space is tacked
352 onto the end of the args in some (at least one anyway)
353 implementations, so strip it off if it exists. */
354
355 {
356 char *command = elf_tdata (abfd)->core_command;
357 int n = strlen (command);
358
359 if (0 < n && command[n - 1] == ' ')
360 command[n - 1] = '\0';
361 }
362
363 return TRUE;
364 }
365 \f
366 /* Functions for the x86-64 ELF linker. */
367
368 /* The name of the dynamic interpreter. This is put in the .interp
369 section. */
370
371 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
372 #define ELF32_DYNAMIC_INTERPRETER "/lib/ld32.so.1"
373
374 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
375 copying dynamic variables from a shared lib into an app's dynbss
376 section, and instead use a dynamic relocation to point into the
377 shared lib. */
378 #define ELIMINATE_COPY_RELOCS 1
379
380 /* The size in bytes of an entry in the global offset table. */
381
382 #define GOT_ENTRY_SIZE 8
383
384 /* The size in bytes of an entry in the procedure linkage table. */
385
386 #define PLT_ENTRY_SIZE 16
387
388 /* The first entry in a procedure linkage table looks like this. See the
389 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
390
391 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
392 {
393 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
394 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
395 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
396 };
397
398 /* Subsequent entries in a procedure linkage table look like this. */
399
400 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
401 {
402 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
403 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
404 0x68, /* pushq immediate */
405 0, 0, 0, 0, /* replaced with index into relocation table. */
406 0xe9, /* jmp relative */
407 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
408 };
409
410 /* x86-64 ELF linker hash entry. */
411
412 struct elf_x86_64_link_hash_entry
413 {
414 struct elf_link_hash_entry elf;
415
416 /* Track dynamic relocs copied for this symbol. */
417 struct elf_dyn_relocs *dyn_relocs;
418
419 #define GOT_UNKNOWN 0
420 #define GOT_NORMAL 1
421 #define GOT_TLS_GD 2
422 #define GOT_TLS_IE 3
423 #define GOT_TLS_GDESC 4
424 #define GOT_TLS_GD_BOTH_P(type) \
425 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
426 #define GOT_TLS_GD_P(type) \
427 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
428 #define GOT_TLS_GDESC_P(type) \
429 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
430 #define GOT_TLS_GD_ANY_P(type) \
431 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
432 unsigned char tls_type;
433
434 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
435 starting at the end of the jump table. */
436 bfd_vma tlsdesc_got;
437 };
438
439 #define elf_x86_64_hash_entry(ent) \
440 ((struct elf_x86_64_link_hash_entry *)(ent))
441
442 struct elf_x86_64_obj_tdata
443 {
444 struct elf_obj_tdata root;
445
446 /* tls_type for each local got entry. */
447 char *local_got_tls_type;
448
449 /* GOTPLT entries for TLS descriptors. */
450 bfd_vma *local_tlsdesc_gotent;
451 };
452
453 #define elf_x86_64_tdata(abfd) \
454 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
455
456 #define elf_x86_64_local_got_tls_type(abfd) \
457 (elf_x86_64_tdata (abfd)->local_got_tls_type)
458
459 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
460 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
461
462 #define is_x86_64_elf(bfd) \
463 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
464 && elf_tdata (bfd) != NULL \
465 && elf_object_id (bfd) == X86_64_ELF_DATA)
466
467 static bfd_boolean
468 elf_x86_64_mkobject (bfd *abfd)
469 {
470 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
471 X86_64_ELF_DATA);
472 }
473
474 /* x86-64 ELF linker hash table. */
475
476 struct elf_x86_64_link_hash_table
477 {
478 struct elf_link_hash_table elf;
479
480 /* Short-cuts to get to dynamic linker sections. */
481 asection *sdynbss;
482 asection *srelbss;
483
484 union
485 {
486 bfd_signed_vma refcount;
487 bfd_vma offset;
488 } tls_ld_got;
489
490 /* The amount of space used by the jump slots in the GOT. */
491 bfd_vma sgotplt_jump_table_size;
492
493 /* Small local sym cache. */
494 struct sym_cache sym_cache;
495
496 bfd_vma (*r_info) (bfd_vma, bfd_vma);
497 bfd_vma (*r_sym) (bfd_vma);
498 void (*swap_reloca_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
499 const char *dynamic_interpreter;
500 int dynamic_interpreter_size;
501
502 /* _TLS_MODULE_BASE_ symbol. */
503 struct bfd_link_hash_entry *tls_module_base;
504
505 /* Used by local STT_GNU_IFUNC symbols. */
506 htab_t loc_hash_table;
507 void * loc_hash_memory;
508
509 /* The offset into splt of the PLT entry for the TLS descriptor
510 resolver. Special values are 0, if not necessary (or not found
511 to be necessary yet), and -1 if needed but not determined
512 yet. */
513 bfd_vma tlsdesc_plt;
514 /* The offset into sgot of the GOT entry used by the PLT entry
515 above. */
516 bfd_vma tlsdesc_got;
517 };
518
519 /* Get the x86-64 ELF linker hash table from a link_info structure. */
520
521 #define elf_x86_64_hash_table(p) \
522 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
523 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
524
525 #define elf_x86_64_compute_jump_table_size(htab) \
526 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
527
528 /* Create an entry in an x86-64 ELF linker hash table. */
529
530 static struct bfd_hash_entry *
531 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
532 struct bfd_hash_table *table,
533 const char *string)
534 {
535 /* Allocate the structure if it has not already been allocated by a
536 subclass. */
537 if (entry == NULL)
538 {
539 entry = (struct bfd_hash_entry *)
540 bfd_hash_allocate (table,
541 sizeof (struct elf_x86_64_link_hash_entry));
542 if (entry == NULL)
543 return entry;
544 }
545
546 /* Call the allocation method of the superclass. */
547 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
548 if (entry != NULL)
549 {
550 struct elf_x86_64_link_hash_entry *eh;
551
552 eh = (struct elf_x86_64_link_hash_entry *) entry;
553 eh->dyn_relocs = NULL;
554 eh->tls_type = GOT_UNKNOWN;
555 eh->tlsdesc_got = (bfd_vma) -1;
556 }
557
558 return entry;
559 }
560
561 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
562 for local symbol so that we can handle local STT_GNU_IFUNC symbols
563 as global symbol. We reuse indx and dynstr_index for local symbol
564 hash since they aren't used by global symbols in this backend. */
565
566 static hashval_t
567 elf_x86_64_local_htab_hash (const void *ptr)
568 {
569 struct elf_link_hash_entry *h
570 = (struct elf_link_hash_entry *) ptr;
571 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
572 }
573
574 /* Compare local hash entries. */
575
576 static int
577 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
578 {
579 struct elf_link_hash_entry *h1
580 = (struct elf_link_hash_entry *) ptr1;
581 struct elf_link_hash_entry *h2
582 = (struct elf_link_hash_entry *) ptr2;
583
584 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
585 }
586
587 /* Find and/or create a hash entry for local symbol. */
588
589 static struct elf_link_hash_entry *
590 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
591 bfd *abfd, const Elf_Internal_Rela *rel,
592 bfd_boolean create)
593 {
594 struct elf_x86_64_link_hash_entry e, *ret;
595 asection *sec = abfd->sections;
596 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
597 htab->r_sym (rel->r_info));
598 void **slot;
599
600 e.elf.indx = sec->id;
601 e.elf.dynstr_index = htab->r_sym (rel->r_info);
602 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
603 create ? INSERT : NO_INSERT);
604
605 if (!slot)
606 return NULL;
607
608 if (*slot)
609 {
610 ret = (struct elf_x86_64_link_hash_entry *) *slot;
611 return &ret->elf;
612 }
613
614 ret = (struct elf_x86_64_link_hash_entry *)
615 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
616 sizeof (struct elf_x86_64_link_hash_entry));
617 if (ret)
618 {
619 memset (ret, 0, sizeof (*ret));
620 ret->elf.indx = sec->id;
621 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
622 ret->elf.dynindx = -1;
623 *slot = ret;
624 }
625 return &ret->elf;
626 }
627
628 /* Create an X86-64 ELF linker hash table. */
629
630 static struct bfd_link_hash_table *
631 elf_x86_64_link_hash_table_create (bfd *abfd)
632 {
633 struct elf_x86_64_link_hash_table *ret;
634 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
635
636 ret = (struct elf_x86_64_link_hash_table *) bfd_malloc (amt);
637 if (ret == NULL)
638 return NULL;
639
640 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
641 elf_x86_64_link_hash_newfunc,
642 sizeof (struct elf_x86_64_link_hash_entry),
643 X86_64_ELF_DATA))
644 {
645 free (ret);
646 return NULL;
647 }
648
649 ret->sdynbss = NULL;
650 ret->srelbss = NULL;
651 ret->sym_cache.abfd = NULL;
652 ret->tlsdesc_plt = 0;
653 ret->tlsdesc_got = 0;
654 ret->tls_ld_got.refcount = 0;
655 ret->sgotplt_jump_table_size = 0;
656 ret->tls_module_base = NULL;
657
658 if (ABI_64_P (abfd))
659 {
660 ret->r_info = elf64_r_info;
661 ret->r_sym = elf64_r_sym;
662 ret->swap_reloca_out = bfd_elf64_swap_reloca_out;
663 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
664 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
665 }
666 else
667 {
668 ret->r_info = elf32_r_info;
669 ret->r_sym = elf32_r_sym;
670 ret->swap_reloca_out = bfd_elf32_swap_reloca_out;
671 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
672 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
673 }
674
675 ret->loc_hash_table = htab_try_create (1024,
676 elf_x86_64_local_htab_hash,
677 elf_x86_64_local_htab_eq,
678 NULL);
679 ret->loc_hash_memory = objalloc_create ();
680 if (!ret->loc_hash_table || !ret->loc_hash_memory)
681 {
682 free (ret);
683 return NULL;
684 }
685
686 return &ret->elf.root;
687 }
688
689 /* Destroy an X86-64 ELF linker hash table. */
690
691 static void
692 elf_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash)
693 {
694 struct elf_x86_64_link_hash_table *htab
695 = (struct elf_x86_64_link_hash_table *) hash;
696
697 if (htab->loc_hash_table)
698 htab_delete (htab->loc_hash_table);
699 if (htab->loc_hash_memory)
700 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
701 _bfd_generic_link_hash_table_free (hash);
702 }
703
704 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
705 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
706 hash table. */
707
708 static bfd_boolean
709 elf_x86_64_create_dynamic_sections (bfd *dynobj,
710 struct bfd_link_info *info)
711 {
712 struct elf_x86_64_link_hash_table *htab;
713
714 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
715 return FALSE;
716
717 htab = elf_x86_64_hash_table (info);
718 if (htab == NULL)
719 return FALSE;
720
721 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
722 if (!info->shared)
723 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
724
725 if (!htab->sdynbss
726 || (!info->shared && !htab->srelbss))
727 abort ();
728
729 return TRUE;
730 }
731
732 /* Copy the extra info we tack onto an elf_link_hash_entry. */
733
734 static void
735 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
736 struct elf_link_hash_entry *dir,
737 struct elf_link_hash_entry *ind)
738 {
739 struct elf_x86_64_link_hash_entry *edir, *eind;
740
741 edir = (struct elf_x86_64_link_hash_entry *) dir;
742 eind = (struct elf_x86_64_link_hash_entry *) ind;
743
744 if (eind->dyn_relocs != NULL)
745 {
746 if (edir->dyn_relocs != NULL)
747 {
748 struct elf_dyn_relocs **pp;
749 struct elf_dyn_relocs *p;
750
751 /* Add reloc counts against the indirect sym to the direct sym
752 list. Merge any entries against the same section. */
753 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
754 {
755 struct elf_dyn_relocs *q;
756
757 for (q = edir->dyn_relocs; q != NULL; q = q->next)
758 if (q->sec == p->sec)
759 {
760 q->pc_count += p->pc_count;
761 q->count += p->count;
762 *pp = p->next;
763 break;
764 }
765 if (q == NULL)
766 pp = &p->next;
767 }
768 *pp = edir->dyn_relocs;
769 }
770
771 edir->dyn_relocs = eind->dyn_relocs;
772 eind->dyn_relocs = NULL;
773 }
774
775 if (ind->root.type == bfd_link_hash_indirect
776 && dir->got.refcount <= 0)
777 {
778 edir->tls_type = eind->tls_type;
779 eind->tls_type = GOT_UNKNOWN;
780 }
781
782 if (ELIMINATE_COPY_RELOCS
783 && ind->root.type != bfd_link_hash_indirect
784 && dir->dynamic_adjusted)
785 {
786 /* If called to transfer flags for a weakdef during processing
787 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
788 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
789 dir->ref_dynamic |= ind->ref_dynamic;
790 dir->ref_regular |= ind->ref_regular;
791 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
792 dir->needs_plt |= ind->needs_plt;
793 dir->pointer_equality_needed |= ind->pointer_equality_needed;
794 }
795 else
796 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
797 }
798
799 static bfd_boolean
800 elf64_x86_64_elf_object_p (bfd *abfd)
801 {
802 /* Set the right machine number for an x86-64 elf64 file. */
803 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
804 return TRUE;
805 }
806
807 typedef union
808 {
809 unsigned char c[2];
810 uint16_t i;
811 }
812 x86_64_opcode16;
813
814 typedef union
815 {
816 unsigned char c[4];
817 uint32_t i;
818 }
819 x86_64_opcode32;
820
821 /* Return TRUE if the TLS access code sequence support transition
822 from R_TYPE. */
823
824 static bfd_boolean
825 elf_x86_64_check_tls_transition (bfd *abfd,
826 struct bfd_link_info *info,
827 asection *sec,
828 bfd_byte *contents,
829 Elf_Internal_Shdr *symtab_hdr,
830 struct elf_link_hash_entry **sym_hashes,
831 unsigned int r_type,
832 const Elf_Internal_Rela *rel,
833 const Elf_Internal_Rela *relend)
834 {
835 unsigned int val;
836 unsigned long r_symndx;
837 struct elf_link_hash_entry *h;
838 bfd_vma offset;
839 struct elf_x86_64_link_hash_table *htab;
840
841 /* Get the section contents. */
842 if (contents == NULL)
843 {
844 if (elf_section_data (sec)->this_hdr.contents != NULL)
845 contents = elf_section_data (sec)->this_hdr.contents;
846 else
847 {
848 /* FIXME: How to better handle error condition? */
849 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
850 return FALSE;
851
852 /* Cache the section contents for elf_link_input_bfd. */
853 elf_section_data (sec)->this_hdr.contents = contents;
854 }
855 }
856
857 htab = elf_x86_64_hash_table (info);
858 offset = rel->r_offset;
859 switch (r_type)
860 {
861 case R_X86_64_TLSGD:
862 case R_X86_64_TLSLD:
863 if ((rel + 1) >= relend)
864 return FALSE;
865
866 if (r_type == R_X86_64_TLSGD)
867 {
868 /* Check transition from GD access model. Only
869 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
870 .word 0x6666; rex64; call __tls_get_addr
871 can transit to different access model. */
872
873 static x86_64_opcode32 leaq = { { 0x66, 0x48, 0x8d, 0x3d } },
874 call = { { 0x66, 0x66, 0x48, 0xe8 } };
875 if (offset < 4
876 || (offset + 12) > sec->size
877 || bfd_get_32 (abfd, contents + offset - 4) != leaq.i
878 || bfd_get_32 (abfd, contents + offset + 4) != call.i)
879 return FALSE;
880 }
881 else
882 {
883 /* Check transition from LD access model. Only
884 leaq foo@tlsld(%rip), %rdi;
885 call __tls_get_addr
886 can transit to different access model. */
887
888 static x86_64_opcode32 ld = { { 0x48, 0x8d, 0x3d, 0xe8 } };
889 x86_64_opcode32 op;
890
891 if (offset < 3 || (offset + 9) > sec->size)
892 return FALSE;
893
894 op.i = bfd_get_32 (abfd, contents + offset - 3);
895 op.c[3] = bfd_get_8 (abfd, contents + offset + 4);
896 if (op.i != ld.i)
897 return FALSE;
898 }
899
900 r_symndx = htab->r_sym (rel[1].r_info);
901 if (r_symndx < symtab_hdr->sh_info)
902 return FALSE;
903
904 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
905 /* Use strncmp to check __tls_get_addr since __tls_get_addr
906 may be versioned. */
907 return (h != NULL
908 && h->root.root.string != NULL
909 && (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
910 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
911 && (strncmp (h->root.root.string,
912 "__tls_get_addr", 14) == 0));
913
914 case R_X86_64_GOTTPOFF:
915 /* Check transition from IE access model:
916 movq foo@gottpoff(%rip), %reg
917 addq foo@gottpoff(%rip), %reg
918 */
919
920 if (offset < 3 || (offset + 4) > sec->size)
921 return FALSE;
922
923 val = bfd_get_8 (abfd, contents + offset - 3);
924 if (val != 0x48 && val != 0x4c)
925 return FALSE;
926
927 val = bfd_get_8 (abfd, contents + offset - 2);
928 if (val != 0x8b && val != 0x03)
929 return FALSE;
930
931 val = bfd_get_8 (abfd, contents + offset - 1);
932 return (val & 0xc7) == 5;
933
934 case R_X86_64_GOTPC32_TLSDESC:
935 /* Check transition from GDesc access model:
936 leaq x@tlsdesc(%rip), %rax
937
938 Make sure it's a leaq adding rip to a 32-bit offset
939 into any register, although it's probably almost always
940 going to be rax. */
941
942 if (offset < 3 || (offset + 4) > sec->size)
943 return FALSE;
944
945 val = bfd_get_8 (abfd, contents + offset - 3);
946 if ((val & 0xfb) != 0x48)
947 return FALSE;
948
949 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
950 return FALSE;
951
952 val = bfd_get_8 (abfd, contents + offset - 1);
953 return (val & 0xc7) == 0x05;
954
955 case R_X86_64_TLSDESC_CALL:
956 /* Check transition from GDesc access model:
957 call *x@tlsdesc(%rax)
958 */
959 if (offset + 2 <= sec->size)
960 {
961 /* Make sure that it's a call *x@tlsdesc(%rax). */
962 static x86_64_opcode16 call = { { 0xff, 0x10 } };
963 return bfd_get_16 (abfd, contents + offset) == call.i;
964 }
965
966 return FALSE;
967
968 default:
969 abort ();
970 }
971 }
972
973 /* Return TRUE if the TLS access transition is OK or no transition
974 will be performed. Update R_TYPE if there is a transition. */
975
976 static bfd_boolean
977 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
978 asection *sec, bfd_byte *contents,
979 Elf_Internal_Shdr *symtab_hdr,
980 struct elf_link_hash_entry **sym_hashes,
981 unsigned int *r_type, int tls_type,
982 const Elf_Internal_Rela *rel,
983 const Elf_Internal_Rela *relend,
984 struct elf_link_hash_entry *h,
985 unsigned long r_symndx)
986 {
987 unsigned int from_type = *r_type;
988 unsigned int to_type = from_type;
989 bfd_boolean check = TRUE;
990
991 /* Skip TLS transition for functions. */
992 if (h != NULL
993 && (h->type == STT_FUNC
994 || h->type == STT_GNU_IFUNC))
995 return TRUE;
996
997 switch (from_type)
998 {
999 case R_X86_64_TLSGD:
1000 case R_X86_64_GOTPC32_TLSDESC:
1001 case R_X86_64_TLSDESC_CALL:
1002 case R_X86_64_GOTTPOFF:
1003 if (info->executable)
1004 {
1005 if (h == NULL)
1006 to_type = R_X86_64_TPOFF32;
1007 else
1008 to_type = R_X86_64_GOTTPOFF;
1009 }
1010
1011 /* When we are called from elf_x86_64_relocate_section,
1012 CONTENTS isn't NULL and there may be additional transitions
1013 based on TLS_TYPE. */
1014 if (contents != NULL)
1015 {
1016 unsigned int new_to_type = to_type;
1017
1018 if (info->executable
1019 && h != NULL
1020 && h->dynindx == -1
1021 && tls_type == GOT_TLS_IE)
1022 new_to_type = R_X86_64_TPOFF32;
1023
1024 if (to_type == R_X86_64_TLSGD
1025 || to_type == R_X86_64_GOTPC32_TLSDESC
1026 || to_type == R_X86_64_TLSDESC_CALL)
1027 {
1028 if (tls_type == GOT_TLS_IE)
1029 new_to_type = R_X86_64_GOTTPOFF;
1030 }
1031
1032 /* We checked the transition before when we were called from
1033 elf_x86_64_check_relocs. We only want to check the new
1034 transition which hasn't been checked before. */
1035 check = new_to_type != to_type && from_type == to_type;
1036 to_type = new_to_type;
1037 }
1038
1039 break;
1040
1041 case R_X86_64_TLSLD:
1042 if (info->executable)
1043 to_type = R_X86_64_TPOFF32;
1044 break;
1045
1046 default:
1047 return TRUE;
1048 }
1049
1050 /* Return TRUE if there is no transition. */
1051 if (from_type == to_type)
1052 return TRUE;
1053
1054 /* Check if the transition can be performed. */
1055 if (check
1056 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1057 symtab_hdr, sym_hashes,
1058 from_type, rel, relend))
1059 {
1060 reloc_howto_type *from, *to;
1061 const char *name;
1062
1063 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1064 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1065
1066 if (h)
1067 name = h->root.root.string;
1068 else
1069 {
1070 struct elf_x86_64_link_hash_table *htab;
1071
1072 htab = elf_x86_64_hash_table (info);
1073 if (htab == NULL)
1074 name = "*unknown*";
1075 else
1076 {
1077 Elf_Internal_Sym *isym;
1078
1079 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1080 abfd, r_symndx);
1081 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1082 }
1083 }
1084
1085 (*_bfd_error_handler)
1086 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1087 "in section `%A' failed"),
1088 abfd, sec, from->name, to->name, name,
1089 (unsigned long) rel->r_offset);
1090 bfd_set_error (bfd_error_bad_value);
1091 return FALSE;
1092 }
1093
1094 *r_type = to_type;
1095 return TRUE;
1096 }
1097
1098 /* Look through the relocs for a section during the first phase, and
1099 calculate needed space in the global offset table, procedure
1100 linkage table, and dynamic reloc sections. */
1101
1102 static bfd_boolean
1103 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1104 asection *sec,
1105 const Elf_Internal_Rela *relocs)
1106 {
1107 struct elf_x86_64_link_hash_table *htab;
1108 Elf_Internal_Shdr *symtab_hdr;
1109 struct elf_link_hash_entry **sym_hashes;
1110 const Elf_Internal_Rela *rel;
1111 const Elf_Internal_Rela *rel_end;
1112 asection *sreloc;
1113
1114 if (info->relocatable)
1115 return TRUE;
1116
1117 BFD_ASSERT (is_x86_64_elf (abfd));
1118
1119 htab = elf_x86_64_hash_table (info);
1120 if (htab == NULL)
1121 return FALSE;
1122
1123 symtab_hdr = &elf_symtab_hdr (abfd);
1124 sym_hashes = elf_sym_hashes (abfd);
1125
1126 sreloc = NULL;
1127
1128 rel_end = relocs + sec->reloc_count;
1129 for (rel = relocs; rel < rel_end; rel++)
1130 {
1131 unsigned int r_type;
1132 unsigned long r_symndx;
1133 struct elf_link_hash_entry *h;
1134 Elf_Internal_Sym *isym;
1135 const char *name;
1136
1137 r_symndx = htab->r_sym (rel->r_info);
1138 r_type = ELF32_R_TYPE (rel->r_info);
1139
1140 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1141 {
1142 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1143 abfd, r_symndx);
1144 return FALSE;
1145 }
1146
1147 if (r_symndx < symtab_hdr->sh_info)
1148 {
1149 /* A local symbol. */
1150 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1151 abfd, r_symndx);
1152 if (isym == NULL)
1153 return FALSE;
1154
1155 /* Check relocation against local STT_GNU_IFUNC symbol. */
1156 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1157 {
1158 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1159 TRUE);
1160 if (h == NULL)
1161 return FALSE;
1162
1163 /* Fake a STT_GNU_IFUNC symbol. */
1164 h->type = STT_GNU_IFUNC;
1165 h->def_regular = 1;
1166 h->ref_regular = 1;
1167 h->forced_local = 1;
1168 h->root.type = bfd_link_hash_defined;
1169 }
1170 else
1171 h = NULL;
1172 }
1173 else
1174 {
1175 isym = NULL;
1176 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1177 while (h->root.type == bfd_link_hash_indirect
1178 || h->root.type == bfd_link_hash_warning)
1179 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1180 }
1181
1182 if (h != NULL)
1183 {
1184 /* Create the ifunc sections for static executables. If we
1185 never see an indirect function symbol nor we are building
1186 a static executable, those sections will be empty and
1187 won't appear in output. */
1188 switch (r_type)
1189 {
1190 default:
1191 break;
1192
1193 case R_X86_64_32S:
1194 case R_X86_64_32:
1195 case R_X86_64_64:
1196 case R_X86_64_PC32:
1197 case R_X86_64_PC64:
1198 case R_X86_64_PLT32:
1199 case R_X86_64_GOTPCREL:
1200 case R_X86_64_GOTPCREL64:
1201 if (!_bfd_elf_create_ifunc_sections (abfd, info))
1202 return FALSE;
1203 break;
1204 }
1205
1206 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1207 it here if it is defined in a non-shared object. */
1208 if (h->type == STT_GNU_IFUNC
1209 && h->def_regular)
1210 {
1211 /* It is referenced by a non-shared object. */
1212 h->ref_regular = 1;
1213 h->needs_plt = 1;
1214
1215 /* STT_GNU_IFUNC symbol must go through PLT. */
1216 h->plt.refcount += 1;
1217
1218 /* STT_GNU_IFUNC needs dynamic sections. */
1219 if (htab->elf.dynobj == NULL)
1220 htab->elf.dynobj = abfd;
1221
1222 switch (r_type)
1223 {
1224 default:
1225 if (h->root.root.string)
1226 name = h->root.root.string;
1227 else
1228 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1229 NULL);
1230 (*_bfd_error_handler)
1231 (_("%B: relocation %s against STT_GNU_IFUNC "
1232 "symbol `%s' isn't handled by %s"), abfd,
1233 x86_64_elf_howto_table[r_type].name,
1234 name, __FUNCTION__);
1235 bfd_set_error (bfd_error_bad_value);
1236 return FALSE;
1237
1238 case R_X86_64_64:
1239 h->non_got_ref = 1;
1240 h->pointer_equality_needed = 1;
1241 if (info->shared)
1242 {
1243 /* We must copy these reloc types into the output
1244 file. Create a reloc section in dynobj and
1245 make room for this reloc. */
1246 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1247 (abfd, info, sec, sreloc,
1248 &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs);
1249 if (sreloc == NULL)
1250 return FALSE;
1251 }
1252 break;
1253
1254 case R_X86_64_32S:
1255 case R_X86_64_32:
1256 case R_X86_64_PC32:
1257 case R_X86_64_PC64:
1258 h->non_got_ref = 1;
1259 if (r_type != R_X86_64_PC32
1260 && r_type != R_X86_64_PC64)
1261 h->pointer_equality_needed = 1;
1262 break;
1263
1264 case R_X86_64_PLT32:
1265 break;
1266
1267 case R_X86_64_GOTPCREL:
1268 case R_X86_64_GOTPCREL64:
1269 h->got.refcount += 1;
1270 if (htab->elf.sgot == NULL
1271 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1272 info))
1273 return FALSE;
1274 break;
1275 }
1276
1277 continue;
1278 }
1279 }
1280
1281 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1282 symtab_hdr, sym_hashes,
1283 &r_type, GOT_UNKNOWN,
1284 rel, rel_end, h, r_symndx))
1285 return FALSE;
1286
1287 switch (r_type)
1288 {
1289 case R_X86_64_TLSLD:
1290 htab->tls_ld_got.refcount += 1;
1291 goto create_got;
1292
1293 case R_X86_64_TPOFF32:
1294 if (!info->executable && ABI_64_P (abfd))
1295 {
1296 if (h)
1297 name = h->root.root.string;
1298 else
1299 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1300 NULL);
1301 (*_bfd_error_handler)
1302 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1303 abfd,
1304 x86_64_elf_howto_table[r_type].name, name);
1305 bfd_set_error (bfd_error_bad_value);
1306 return FALSE;
1307 }
1308 break;
1309
1310 case R_X86_64_GOTTPOFF:
1311 if (!info->executable)
1312 info->flags |= DF_STATIC_TLS;
1313 /* Fall through */
1314
1315 case R_X86_64_GOT32:
1316 case R_X86_64_GOTPCREL:
1317 case R_X86_64_TLSGD:
1318 case R_X86_64_GOT64:
1319 case R_X86_64_GOTPCREL64:
1320 case R_X86_64_GOTPLT64:
1321 case R_X86_64_GOTPC32_TLSDESC:
1322 case R_X86_64_TLSDESC_CALL:
1323 /* This symbol requires a global offset table entry. */
1324 {
1325 int tls_type, old_tls_type;
1326
1327 switch (r_type)
1328 {
1329 default: tls_type = GOT_NORMAL; break;
1330 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1331 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1332 case R_X86_64_GOTPC32_TLSDESC:
1333 case R_X86_64_TLSDESC_CALL:
1334 tls_type = GOT_TLS_GDESC; break;
1335 }
1336
1337 if (h != NULL)
1338 {
1339 if (r_type == R_X86_64_GOTPLT64)
1340 {
1341 /* This relocation indicates that we also need
1342 a PLT entry, as this is a function. We don't need
1343 a PLT entry for local symbols. */
1344 h->needs_plt = 1;
1345 h->plt.refcount += 1;
1346 }
1347 h->got.refcount += 1;
1348 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1349 }
1350 else
1351 {
1352 bfd_signed_vma *local_got_refcounts;
1353
1354 /* This is a global offset table entry for a local symbol. */
1355 local_got_refcounts = elf_local_got_refcounts (abfd);
1356 if (local_got_refcounts == NULL)
1357 {
1358 bfd_size_type size;
1359
1360 size = symtab_hdr->sh_info;
1361 size *= sizeof (bfd_signed_vma)
1362 + sizeof (bfd_vma) + sizeof (char);
1363 local_got_refcounts = ((bfd_signed_vma *)
1364 bfd_zalloc (abfd, size));
1365 if (local_got_refcounts == NULL)
1366 return FALSE;
1367 elf_local_got_refcounts (abfd) = local_got_refcounts;
1368 elf_x86_64_local_tlsdesc_gotent (abfd)
1369 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1370 elf_x86_64_local_got_tls_type (abfd)
1371 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1372 }
1373 local_got_refcounts[r_symndx] += 1;
1374 old_tls_type
1375 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1376 }
1377
1378 /* If a TLS symbol is accessed using IE at least once,
1379 there is no point to use dynamic model for it. */
1380 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1381 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1382 || tls_type != GOT_TLS_IE))
1383 {
1384 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1385 tls_type = old_tls_type;
1386 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1387 && GOT_TLS_GD_ANY_P (tls_type))
1388 tls_type |= old_tls_type;
1389 else
1390 {
1391 if (h)
1392 name = h->root.root.string;
1393 else
1394 name = bfd_elf_sym_name (abfd, symtab_hdr,
1395 isym, NULL);
1396 (*_bfd_error_handler)
1397 (_("%B: '%s' accessed both as normal and thread local symbol"),
1398 abfd, name);
1399 return FALSE;
1400 }
1401 }
1402
1403 if (old_tls_type != tls_type)
1404 {
1405 if (h != NULL)
1406 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1407 else
1408 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1409 }
1410 }
1411 /* Fall through */
1412
1413 case R_X86_64_GOTOFF64:
1414 case R_X86_64_GOTPC32:
1415 case R_X86_64_GOTPC64:
1416 create_got:
1417 if (htab->elf.sgot == NULL)
1418 {
1419 if (htab->elf.dynobj == NULL)
1420 htab->elf.dynobj = abfd;
1421 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1422 info))
1423 return FALSE;
1424 }
1425 break;
1426
1427 case R_X86_64_PLT32:
1428 /* This symbol requires a procedure linkage table entry. We
1429 actually build the entry in adjust_dynamic_symbol,
1430 because this might be a case of linking PIC code which is
1431 never referenced by a dynamic object, in which case we
1432 don't need to generate a procedure linkage table entry
1433 after all. */
1434
1435 /* If this is a local symbol, we resolve it directly without
1436 creating a procedure linkage table entry. */
1437 if (h == NULL)
1438 continue;
1439
1440 h->needs_plt = 1;
1441 h->plt.refcount += 1;
1442 break;
1443
1444 case R_X86_64_PLTOFF64:
1445 /* This tries to form the 'address' of a function relative
1446 to GOT. For global symbols we need a PLT entry. */
1447 if (h != NULL)
1448 {
1449 h->needs_plt = 1;
1450 h->plt.refcount += 1;
1451 }
1452 goto create_got;
1453
1454 case R_X86_64_8:
1455 case R_X86_64_16:
1456 case R_X86_64_32:
1457 case R_X86_64_32S:
1458 /* Let's help debug shared library creation. These relocs
1459 cannot be used in shared libs. Don't error out for
1460 sections we don't care about, such as debug sections or
1461 non-constant sections. */
1462 if (info->shared
1463 && ABI_64_P (abfd)
1464 && (sec->flags & SEC_ALLOC) != 0
1465 && (sec->flags & SEC_READONLY) != 0)
1466 {
1467 if (h)
1468 name = h->root.root.string;
1469 else
1470 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1471 (*_bfd_error_handler)
1472 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1473 abfd, x86_64_elf_howto_table[r_type].name, name);
1474 bfd_set_error (bfd_error_bad_value);
1475 return FALSE;
1476 }
1477 /* Fall through. */
1478
1479 case R_X86_64_PC8:
1480 case R_X86_64_PC16:
1481 case R_X86_64_PC32:
1482 case R_X86_64_PC64:
1483 case R_X86_64_64:
1484 if (h != NULL && info->executable)
1485 {
1486 /* If this reloc is in a read-only section, we might
1487 need a copy reloc. We can't check reliably at this
1488 stage whether the section is read-only, as input
1489 sections have not yet been mapped to output sections.
1490 Tentatively set the flag for now, and correct in
1491 adjust_dynamic_symbol. */
1492 h->non_got_ref = 1;
1493
1494 /* We may need a .plt entry if the function this reloc
1495 refers to is in a shared lib. */
1496 h->plt.refcount += 1;
1497 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
1498 h->pointer_equality_needed = 1;
1499 }
1500
1501 /* If we are creating a shared library, and this is a reloc
1502 against a global symbol, or a non PC relative reloc
1503 against a local symbol, then we need to copy the reloc
1504 into the shared library. However, if we are linking with
1505 -Bsymbolic, we do not need to copy a reloc against a
1506 global symbol which is defined in an object we are
1507 including in the link (i.e., DEF_REGULAR is set). At
1508 this point we have not seen all the input files, so it is
1509 possible that DEF_REGULAR is not set now but will be set
1510 later (it is never cleared). In case of a weak definition,
1511 DEF_REGULAR may be cleared later by a strong definition in
1512 a shared library. We account for that possibility below by
1513 storing information in the relocs_copied field of the hash
1514 table entry. A similar situation occurs when creating
1515 shared libraries and symbol visibility changes render the
1516 symbol local.
1517
1518 If on the other hand, we are creating an executable, we
1519 may need to keep relocations for symbols satisfied by a
1520 dynamic library if we manage to avoid copy relocs for the
1521 symbol. */
1522 if ((info->shared
1523 && (sec->flags & SEC_ALLOC) != 0
1524 && (! IS_X86_64_PCREL_TYPE (r_type)
1525 || (h != NULL
1526 && (! SYMBOLIC_BIND (info, h)
1527 || h->root.type == bfd_link_hash_defweak
1528 || !h->def_regular))))
1529 || (ELIMINATE_COPY_RELOCS
1530 && !info->shared
1531 && (sec->flags & SEC_ALLOC) != 0
1532 && h != NULL
1533 && (h->root.type == bfd_link_hash_defweak
1534 || !h->def_regular)))
1535 {
1536 struct elf_dyn_relocs *p;
1537 struct elf_dyn_relocs **head;
1538
1539 /* We must copy these reloc types into the output file.
1540 Create a reloc section in dynobj and make room for
1541 this reloc. */
1542 if (sreloc == NULL)
1543 {
1544 if (htab->elf.dynobj == NULL)
1545 htab->elf.dynobj = abfd;
1546
1547 sreloc = _bfd_elf_make_dynamic_reloc_section
1548 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1549
1550 if (sreloc == NULL)
1551 return FALSE;
1552 }
1553
1554 /* If this is a global symbol, we count the number of
1555 relocations we need for this symbol. */
1556 if (h != NULL)
1557 {
1558 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
1559 }
1560 else
1561 {
1562 /* Track dynamic relocs needed for local syms too.
1563 We really need local syms available to do this
1564 easily. Oh well. */
1565 asection *s;
1566 void **vpp;
1567
1568 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1569 abfd, r_symndx);
1570 if (isym == NULL)
1571 return FALSE;
1572
1573 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1574 if (s == NULL)
1575 s = sec;
1576
1577 /* Beware of type punned pointers vs strict aliasing
1578 rules. */
1579 vpp = &(elf_section_data (s)->local_dynrel);
1580 head = (struct elf_dyn_relocs **)vpp;
1581 }
1582
1583 p = *head;
1584 if (p == NULL || p->sec != sec)
1585 {
1586 bfd_size_type amt = sizeof *p;
1587
1588 p = ((struct elf_dyn_relocs *)
1589 bfd_alloc (htab->elf.dynobj, amt));
1590 if (p == NULL)
1591 return FALSE;
1592 p->next = *head;
1593 *head = p;
1594 p->sec = sec;
1595 p->count = 0;
1596 p->pc_count = 0;
1597 }
1598
1599 p->count += 1;
1600 if (IS_X86_64_PCREL_TYPE (r_type))
1601 p->pc_count += 1;
1602 }
1603 break;
1604
1605 /* This relocation describes the C++ object vtable hierarchy.
1606 Reconstruct it for later use during GC. */
1607 case R_X86_64_GNU_VTINHERIT:
1608 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1609 return FALSE;
1610 break;
1611
1612 /* This relocation describes which C++ vtable entries are actually
1613 used. Record for later use during GC. */
1614 case R_X86_64_GNU_VTENTRY:
1615 BFD_ASSERT (h != NULL);
1616 if (h != NULL
1617 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1618 return FALSE;
1619 break;
1620
1621 default:
1622 break;
1623 }
1624 }
1625
1626 return TRUE;
1627 }
1628
1629 /* Return the section that should be marked against GC for a given
1630 relocation. */
1631
1632 static asection *
1633 elf_x86_64_gc_mark_hook (asection *sec,
1634 struct bfd_link_info *info,
1635 Elf_Internal_Rela *rel,
1636 struct elf_link_hash_entry *h,
1637 Elf_Internal_Sym *sym)
1638 {
1639 if (h != NULL)
1640 switch (ELF32_R_TYPE (rel->r_info))
1641 {
1642 case R_X86_64_GNU_VTINHERIT:
1643 case R_X86_64_GNU_VTENTRY:
1644 return NULL;
1645 }
1646
1647 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1648 }
1649
1650 /* Update the got entry reference counts for the section being removed. */
1651
1652 static bfd_boolean
1653 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1654 asection *sec,
1655 const Elf_Internal_Rela *relocs)
1656 {
1657 struct elf_x86_64_link_hash_table *htab;
1658 Elf_Internal_Shdr *symtab_hdr;
1659 struct elf_link_hash_entry **sym_hashes;
1660 bfd_signed_vma *local_got_refcounts;
1661 const Elf_Internal_Rela *rel, *relend;
1662
1663 if (info->relocatable)
1664 return TRUE;
1665
1666 htab = elf_x86_64_hash_table (info);
1667 if (htab == NULL)
1668 return FALSE;
1669
1670 elf_section_data (sec)->local_dynrel = NULL;
1671
1672 symtab_hdr = &elf_symtab_hdr (abfd);
1673 sym_hashes = elf_sym_hashes (abfd);
1674 local_got_refcounts = elf_local_got_refcounts (abfd);
1675
1676 htab = elf_x86_64_hash_table (info);
1677 relend = relocs + sec->reloc_count;
1678 for (rel = relocs; rel < relend; rel++)
1679 {
1680 unsigned long r_symndx;
1681 unsigned int r_type;
1682 struct elf_link_hash_entry *h = NULL;
1683
1684 r_symndx = htab->r_sym (rel->r_info);
1685 if (r_symndx >= symtab_hdr->sh_info)
1686 {
1687 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1688 while (h->root.type == bfd_link_hash_indirect
1689 || h->root.type == bfd_link_hash_warning)
1690 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1691 }
1692 else
1693 {
1694 /* A local symbol. */
1695 Elf_Internal_Sym *isym;
1696
1697 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1698 abfd, r_symndx);
1699
1700 /* Check relocation against local STT_GNU_IFUNC symbol. */
1701 if (isym != NULL
1702 && ELF64_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1703 {
1704 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
1705 if (h == NULL)
1706 abort ();
1707 }
1708 }
1709
1710 if (h)
1711 {
1712 struct elf_x86_64_link_hash_entry *eh;
1713 struct elf_dyn_relocs **pp;
1714 struct elf_dyn_relocs *p;
1715
1716 eh = (struct elf_x86_64_link_hash_entry *) h;
1717
1718 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1719 if (p->sec == sec)
1720 {
1721 /* Everything must go for SEC. */
1722 *pp = p->next;
1723 break;
1724 }
1725 }
1726
1727 r_type = ELF32_R_TYPE (rel->r_info);
1728 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1729 symtab_hdr, sym_hashes,
1730 &r_type, GOT_UNKNOWN,
1731 rel, relend, h, r_symndx))
1732 return FALSE;
1733
1734 switch (r_type)
1735 {
1736 case R_X86_64_TLSLD:
1737 if (htab->tls_ld_got.refcount > 0)
1738 htab->tls_ld_got.refcount -= 1;
1739 break;
1740
1741 case R_X86_64_TLSGD:
1742 case R_X86_64_GOTPC32_TLSDESC:
1743 case R_X86_64_TLSDESC_CALL:
1744 case R_X86_64_GOTTPOFF:
1745 case R_X86_64_GOT32:
1746 case R_X86_64_GOTPCREL:
1747 case R_X86_64_GOT64:
1748 case R_X86_64_GOTPCREL64:
1749 case R_X86_64_GOTPLT64:
1750 if (h != NULL)
1751 {
1752 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
1753 h->plt.refcount -= 1;
1754 if (h->got.refcount > 0)
1755 h->got.refcount -= 1;
1756 if (h->type == STT_GNU_IFUNC)
1757 {
1758 if (h->plt.refcount > 0)
1759 h->plt.refcount -= 1;
1760 }
1761 }
1762 else if (local_got_refcounts != NULL)
1763 {
1764 if (local_got_refcounts[r_symndx] > 0)
1765 local_got_refcounts[r_symndx] -= 1;
1766 }
1767 break;
1768
1769 case R_X86_64_8:
1770 case R_X86_64_16:
1771 case R_X86_64_32:
1772 case R_X86_64_64:
1773 case R_X86_64_32S:
1774 case R_X86_64_PC8:
1775 case R_X86_64_PC16:
1776 case R_X86_64_PC32:
1777 case R_X86_64_PC64:
1778 if (info->shared
1779 && (h == NULL || h->type != STT_GNU_IFUNC))
1780 break;
1781 /* Fall thru */
1782
1783 case R_X86_64_PLT32:
1784 case R_X86_64_PLTOFF64:
1785 if (h != NULL)
1786 {
1787 if (h->plt.refcount > 0)
1788 h->plt.refcount -= 1;
1789 }
1790 break;
1791
1792 default:
1793 break;
1794 }
1795 }
1796
1797 return TRUE;
1798 }
1799
1800 /* Adjust a symbol defined by a dynamic object and referenced by a
1801 regular object. The current definition is in some section of the
1802 dynamic object, but we're not including those sections. We have to
1803 change the definition to something the rest of the link can
1804 understand. */
1805
1806 static bfd_boolean
1807 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
1808 struct elf_link_hash_entry *h)
1809 {
1810 struct elf_x86_64_link_hash_table *htab;
1811 asection *s;
1812
1813 /* STT_GNU_IFUNC symbol must go through PLT. */
1814 if (h->type == STT_GNU_IFUNC)
1815 {
1816 if (h->plt.refcount <= 0)
1817 {
1818 h->plt.offset = (bfd_vma) -1;
1819 h->needs_plt = 0;
1820 }
1821 return TRUE;
1822 }
1823
1824 /* If this is a function, put it in the procedure linkage table. We
1825 will fill in the contents of the procedure linkage table later,
1826 when we know the address of the .got section. */
1827 if (h->type == STT_FUNC
1828 || h->needs_plt)
1829 {
1830 if (h->plt.refcount <= 0
1831 || SYMBOL_CALLS_LOCAL (info, h)
1832 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1833 && h->root.type == bfd_link_hash_undefweak))
1834 {
1835 /* This case can occur if we saw a PLT32 reloc in an input
1836 file, but the symbol was never referred to by a dynamic
1837 object, or if all references were garbage collected. In
1838 such a case, we don't actually need to build a procedure
1839 linkage table, and we can just do a PC32 reloc instead. */
1840 h->plt.offset = (bfd_vma) -1;
1841 h->needs_plt = 0;
1842 }
1843
1844 return TRUE;
1845 }
1846 else
1847 /* It's possible that we incorrectly decided a .plt reloc was
1848 needed for an R_X86_64_PC32 reloc to a non-function sym in
1849 check_relocs. We can't decide accurately between function and
1850 non-function syms in check-relocs; Objects loaded later in
1851 the link may change h->type. So fix it now. */
1852 h->plt.offset = (bfd_vma) -1;
1853
1854 /* If this is a weak symbol, and there is a real definition, the
1855 processor independent code will have arranged for us to see the
1856 real definition first, and we can just use the same value. */
1857 if (h->u.weakdef != NULL)
1858 {
1859 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1860 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1861 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1862 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1863 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1864 h->non_got_ref = h->u.weakdef->non_got_ref;
1865 return TRUE;
1866 }
1867
1868 /* This is a reference to a symbol defined by a dynamic object which
1869 is not a function. */
1870
1871 /* If we are creating a shared library, we must presume that the
1872 only references to the symbol are via the global offset table.
1873 For such cases we need not do anything here; the relocations will
1874 be handled correctly by relocate_section. */
1875 if (info->shared)
1876 return TRUE;
1877
1878 /* If there are no references to this symbol that do not use the
1879 GOT, we don't need to generate a copy reloc. */
1880 if (!h->non_got_ref)
1881 return TRUE;
1882
1883 /* If -z nocopyreloc was given, we won't generate them either. */
1884 if (info->nocopyreloc)
1885 {
1886 h->non_got_ref = 0;
1887 return TRUE;
1888 }
1889
1890 if (ELIMINATE_COPY_RELOCS)
1891 {
1892 struct elf_x86_64_link_hash_entry * eh;
1893 struct elf_dyn_relocs *p;
1894
1895 eh = (struct elf_x86_64_link_hash_entry *) h;
1896 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1897 {
1898 s = p->sec->output_section;
1899 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1900 break;
1901 }
1902
1903 /* If we didn't find any dynamic relocs in read-only sections, then
1904 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1905 if (p == NULL)
1906 {
1907 h->non_got_ref = 0;
1908 return TRUE;
1909 }
1910 }
1911
1912 if (h->size == 0)
1913 {
1914 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1915 h->root.root.string);
1916 return TRUE;
1917 }
1918
1919 /* We must allocate the symbol in our .dynbss section, which will
1920 become part of the .bss section of the executable. There will be
1921 an entry for this symbol in the .dynsym section. The dynamic
1922 object will contain position independent code, so all references
1923 from the dynamic object to this symbol will go through the global
1924 offset table. The dynamic linker will use the .dynsym entry to
1925 determine the address it must put in the global offset table, so
1926 both the dynamic object and the regular object will refer to the
1927 same memory location for the variable. */
1928
1929 htab = elf_x86_64_hash_table (info);
1930 if (htab == NULL)
1931 return FALSE;
1932
1933 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1934 to copy the initial value out of the dynamic object and into the
1935 runtime process image. */
1936 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1937 {
1938 const struct elf_backend_data *bed;
1939 bed = get_elf_backend_data (info->output_bfd);
1940 htab->srelbss->size += bed->s->sizeof_rela;
1941 h->needs_copy = 1;
1942 }
1943
1944 s = htab->sdynbss;
1945
1946 return _bfd_elf_adjust_dynamic_copy (h, s);
1947 }
1948
1949 /* Allocate space in .plt, .got and associated reloc sections for
1950 dynamic relocs. */
1951
1952 static bfd_boolean
1953 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1954 {
1955 struct bfd_link_info *info;
1956 struct elf_x86_64_link_hash_table *htab;
1957 struct elf_x86_64_link_hash_entry *eh;
1958 struct elf_dyn_relocs *p;
1959 const struct elf_backend_data *bed;
1960
1961 if (h->root.type == bfd_link_hash_indirect)
1962 return TRUE;
1963
1964 if (h->root.type == bfd_link_hash_warning)
1965 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1966 eh = (struct elf_x86_64_link_hash_entry *) h;
1967
1968 info = (struct bfd_link_info *) inf;
1969 htab = elf_x86_64_hash_table (info);
1970 if (htab == NULL)
1971 return FALSE;
1972 bed = get_elf_backend_data (info->output_bfd);
1973
1974 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1975 here if it is defined and referenced in a non-shared object. */
1976 if (h->type == STT_GNU_IFUNC
1977 && h->def_regular)
1978 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
1979 &eh->dyn_relocs,
1980 PLT_ENTRY_SIZE,
1981 GOT_ENTRY_SIZE);
1982 else if (htab->elf.dynamic_sections_created
1983 && h->plt.refcount > 0)
1984 {
1985 /* Make sure this symbol is output as a dynamic symbol.
1986 Undefined weak syms won't yet be marked as dynamic. */
1987 if (h->dynindx == -1
1988 && !h->forced_local)
1989 {
1990 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1991 return FALSE;
1992 }
1993
1994 if (info->shared
1995 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1996 {
1997 asection *s = htab->elf.splt;
1998
1999 /* If this is the first .plt entry, make room for the special
2000 first entry. */
2001 if (s->size == 0)
2002 s->size += PLT_ENTRY_SIZE;
2003
2004 h->plt.offset = s->size;
2005
2006 /* If this symbol is not defined in a regular file, and we are
2007 not generating a shared library, then set the symbol to this
2008 location in the .plt. This is required to make function
2009 pointers compare as equal between the normal executable and
2010 the shared library. */
2011 if (! info->shared
2012 && !h->def_regular)
2013 {
2014 h->root.u.def.section = s;
2015 h->root.u.def.value = h->plt.offset;
2016 }
2017
2018 /* Make room for this entry. */
2019 s->size += PLT_ENTRY_SIZE;
2020
2021 /* We also need to make an entry in the .got.plt section, which
2022 will be placed in the .got section by the linker script. */
2023 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2024
2025 /* We also need to make an entry in the .rela.plt section. */
2026 htab->elf.srelplt->size += bed->s->sizeof_rela;
2027 htab->elf.srelplt->reloc_count++;
2028 }
2029 else
2030 {
2031 h->plt.offset = (bfd_vma) -1;
2032 h->needs_plt = 0;
2033 }
2034 }
2035 else
2036 {
2037 h->plt.offset = (bfd_vma) -1;
2038 h->needs_plt = 0;
2039 }
2040
2041 eh->tlsdesc_got = (bfd_vma) -1;
2042
2043 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2044 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2045 if (h->got.refcount > 0
2046 && info->executable
2047 && h->dynindx == -1
2048 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2049 {
2050 h->got.offset = (bfd_vma) -1;
2051 }
2052 else if (h->got.refcount > 0)
2053 {
2054 asection *s;
2055 bfd_boolean dyn;
2056 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2057
2058 /* Make sure this symbol is output as a dynamic symbol.
2059 Undefined weak syms won't yet be marked as dynamic. */
2060 if (h->dynindx == -1
2061 && !h->forced_local)
2062 {
2063 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2064 return FALSE;
2065 }
2066
2067 if (GOT_TLS_GDESC_P (tls_type))
2068 {
2069 eh->tlsdesc_got = htab->elf.sgotplt->size
2070 - elf_x86_64_compute_jump_table_size (htab);
2071 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2072 h->got.offset = (bfd_vma) -2;
2073 }
2074 if (! GOT_TLS_GDESC_P (tls_type)
2075 || GOT_TLS_GD_P (tls_type))
2076 {
2077 s = htab->elf.sgot;
2078 h->got.offset = s->size;
2079 s->size += GOT_ENTRY_SIZE;
2080 if (GOT_TLS_GD_P (tls_type))
2081 s->size += GOT_ENTRY_SIZE;
2082 }
2083 dyn = htab->elf.dynamic_sections_created;
2084 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2085 and two if global.
2086 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2087 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2088 || tls_type == GOT_TLS_IE)
2089 htab->elf.srelgot->size += bed->s->sizeof_rela;
2090 else if (GOT_TLS_GD_P (tls_type))
2091 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2092 else if (! GOT_TLS_GDESC_P (tls_type)
2093 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2094 || h->root.type != bfd_link_hash_undefweak)
2095 && (info->shared
2096 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2097 htab->elf.srelgot->size += bed->s->sizeof_rela;
2098 if (GOT_TLS_GDESC_P (tls_type))
2099 {
2100 htab->elf.srelplt->size += bed->s->sizeof_rela;
2101 htab->tlsdesc_plt = (bfd_vma) -1;
2102 }
2103 }
2104 else
2105 h->got.offset = (bfd_vma) -1;
2106
2107 if (eh->dyn_relocs == NULL)
2108 return TRUE;
2109
2110 /* In the shared -Bsymbolic case, discard space allocated for
2111 dynamic pc-relative relocs against symbols which turn out to be
2112 defined in regular objects. For the normal shared case, discard
2113 space for pc-relative relocs that have become local due to symbol
2114 visibility changes. */
2115
2116 if (info->shared)
2117 {
2118 /* Relocs that use pc_count are those that appear on a call
2119 insn, or certain REL relocs that can generated via assembly.
2120 We want calls to protected symbols to resolve directly to the
2121 function rather than going via the plt. If people want
2122 function pointer comparisons to work as expected then they
2123 should avoid writing weird assembly. */
2124 if (SYMBOL_CALLS_LOCAL (info, h))
2125 {
2126 struct elf_dyn_relocs **pp;
2127
2128 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2129 {
2130 p->count -= p->pc_count;
2131 p->pc_count = 0;
2132 if (p->count == 0)
2133 *pp = p->next;
2134 else
2135 pp = &p->next;
2136 }
2137 }
2138
2139 /* Also discard relocs on undefined weak syms with non-default
2140 visibility. */
2141 if (eh->dyn_relocs != NULL
2142 && h->root.type == bfd_link_hash_undefweak)
2143 {
2144 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2145 eh->dyn_relocs = NULL;
2146
2147 /* Make sure undefined weak symbols are output as a dynamic
2148 symbol in PIEs. */
2149 else if (h->dynindx == -1
2150 && ! h->forced_local
2151 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2152 return FALSE;
2153 }
2154
2155 }
2156 else if (ELIMINATE_COPY_RELOCS)
2157 {
2158 /* For the non-shared case, discard space for relocs against
2159 symbols which turn out to need copy relocs or are not
2160 dynamic. */
2161
2162 if (!h->non_got_ref
2163 && ((h->def_dynamic
2164 && !h->def_regular)
2165 || (htab->elf.dynamic_sections_created
2166 && (h->root.type == bfd_link_hash_undefweak
2167 || h->root.type == bfd_link_hash_undefined))))
2168 {
2169 /* Make sure this symbol is output as a dynamic symbol.
2170 Undefined weak syms won't yet be marked as dynamic. */
2171 if (h->dynindx == -1
2172 && ! h->forced_local
2173 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2174 return FALSE;
2175
2176 /* If that succeeded, we know we'll be keeping all the
2177 relocs. */
2178 if (h->dynindx != -1)
2179 goto keep;
2180 }
2181
2182 eh->dyn_relocs = NULL;
2183
2184 keep: ;
2185 }
2186
2187 /* Finally, allocate space. */
2188 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2189 {
2190 asection * sreloc;
2191
2192 sreloc = elf_section_data (p->sec)->sreloc;
2193
2194 BFD_ASSERT (sreloc != NULL);
2195
2196 sreloc->size += p->count * bed->s->sizeof_rela;
2197 }
2198
2199 return TRUE;
2200 }
2201
2202 /* Allocate space in .plt, .got and associated reloc sections for
2203 local dynamic relocs. */
2204
2205 static bfd_boolean
2206 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2207 {
2208 struct elf_link_hash_entry *h
2209 = (struct elf_link_hash_entry *) *slot;
2210
2211 if (h->type != STT_GNU_IFUNC
2212 || !h->def_regular
2213 || !h->ref_regular
2214 || !h->forced_local
2215 || h->root.type != bfd_link_hash_defined)
2216 abort ();
2217
2218 return elf_x86_64_allocate_dynrelocs (h, inf);
2219 }
2220
2221 /* Find any dynamic relocs that apply to read-only sections. */
2222
2223 static bfd_boolean
2224 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2225 void * inf)
2226 {
2227 struct elf_x86_64_link_hash_entry *eh;
2228 struct elf_dyn_relocs *p;
2229
2230 if (h->root.type == bfd_link_hash_warning)
2231 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2232
2233 eh = (struct elf_x86_64_link_hash_entry *) h;
2234 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2235 {
2236 asection *s = p->sec->output_section;
2237
2238 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2239 {
2240 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2241
2242 info->flags |= DF_TEXTREL;
2243
2244 /* Not an error, just cut short the traversal. */
2245 return FALSE;
2246 }
2247 }
2248 return TRUE;
2249 }
2250
2251 /* Set the sizes of the dynamic sections. */
2252
2253 static bfd_boolean
2254 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
2255 struct bfd_link_info *info)
2256 {
2257 struct elf_x86_64_link_hash_table *htab;
2258 bfd *dynobj;
2259 asection *s;
2260 bfd_boolean relocs;
2261 bfd *ibfd;
2262 const struct elf_backend_data *bed;
2263
2264 htab = elf_x86_64_hash_table (info);
2265 if (htab == NULL)
2266 return FALSE;
2267 bed = get_elf_backend_data (output_bfd);
2268
2269 dynobj = htab->elf.dynobj;
2270 if (dynobj == NULL)
2271 abort ();
2272
2273 if (htab->elf.dynamic_sections_created)
2274 {
2275 /* Set the contents of the .interp section to the interpreter. */
2276 if (info->executable)
2277 {
2278 s = bfd_get_section_by_name (dynobj, ".interp");
2279 if (s == NULL)
2280 abort ();
2281 s->size = htab->dynamic_interpreter_size;
2282 s->contents = (unsigned char *) htab->dynamic_interpreter;
2283 }
2284 }
2285
2286 /* Set up .got offsets for local syms, and space for local dynamic
2287 relocs. */
2288 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2289 {
2290 bfd_signed_vma *local_got;
2291 bfd_signed_vma *end_local_got;
2292 char *local_tls_type;
2293 bfd_vma *local_tlsdesc_gotent;
2294 bfd_size_type locsymcount;
2295 Elf_Internal_Shdr *symtab_hdr;
2296 asection *srel;
2297
2298 if (! is_x86_64_elf (ibfd))
2299 continue;
2300
2301 for (s = ibfd->sections; s != NULL; s = s->next)
2302 {
2303 struct elf_dyn_relocs *p;
2304
2305 for (p = (struct elf_dyn_relocs *)
2306 (elf_section_data (s)->local_dynrel);
2307 p != NULL;
2308 p = p->next)
2309 {
2310 if (!bfd_is_abs_section (p->sec)
2311 && bfd_is_abs_section (p->sec->output_section))
2312 {
2313 /* Input section has been discarded, either because
2314 it is a copy of a linkonce section or due to
2315 linker script /DISCARD/, so we'll be discarding
2316 the relocs too. */
2317 }
2318 else if (p->count != 0)
2319 {
2320 srel = elf_section_data (p->sec)->sreloc;
2321 srel->size += p->count * bed->s->sizeof_rela;
2322 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2323 info->flags |= DF_TEXTREL;
2324 }
2325 }
2326 }
2327
2328 local_got = elf_local_got_refcounts (ibfd);
2329 if (!local_got)
2330 continue;
2331
2332 symtab_hdr = &elf_symtab_hdr (ibfd);
2333 locsymcount = symtab_hdr->sh_info;
2334 end_local_got = local_got + locsymcount;
2335 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
2336 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
2337 s = htab->elf.sgot;
2338 srel = htab->elf.srelgot;
2339 for (; local_got < end_local_got;
2340 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2341 {
2342 *local_tlsdesc_gotent = (bfd_vma) -1;
2343 if (*local_got > 0)
2344 {
2345 if (GOT_TLS_GDESC_P (*local_tls_type))
2346 {
2347 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2348 - elf_x86_64_compute_jump_table_size (htab);
2349 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2350 *local_got = (bfd_vma) -2;
2351 }
2352 if (! GOT_TLS_GDESC_P (*local_tls_type)
2353 || GOT_TLS_GD_P (*local_tls_type))
2354 {
2355 *local_got = s->size;
2356 s->size += GOT_ENTRY_SIZE;
2357 if (GOT_TLS_GD_P (*local_tls_type))
2358 s->size += GOT_ENTRY_SIZE;
2359 }
2360 if (info->shared
2361 || GOT_TLS_GD_ANY_P (*local_tls_type)
2362 || *local_tls_type == GOT_TLS_IE)
2363 {
2364 if (GOT_TLS_GDESC_P (*local_tls_type))
2365 {
2366 htab->elf.srelplt->size
2367 += bed->s->sizeof_rela;
2368 htab->tlsdesc_plt = (bfd_vma) -1;
2369 }
2370 if (! GOT_TLS_GDESC_P (*local_tls_type)
2371 || GOT_TLS_GD_P (*local_tls_type))
2372 srel->size += bed->s->sizeof_rela;
2373 }
2374 }
2375 else
2376 *local_got = (bfd_vma) -1;
2377 }
2378 }
2379
2380 if (htab->tls_ld_got.refcount > 0)
2381 {
2382 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2383 relocs. */
2384 htab->tls_ld_got.offset = htab->elf.sgot->size;
2385 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2386 htab->elf.srelgot->size += bed->s->sizeof_rela;
2387 }
2388 else
2389 htab->tls_ld_got.offset = -1;
2390
2391 /* Allocate global sym .plt and .got entries, and space for global
2392 sym dynamic relocs. */
2393 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
2394 info);
2395
2396 /* Allocate .plt and .got entries, and space for local symbols. */
2397 htab_traverse (htab->loc_hash_table,
2398 elf_x86_64_allocate_local_dynrelocs,
2399 info);
2400
2401 /* For every jump slot reserved in the sgotplt, reloc_count is
2402 incremented. However, when we reserve space for TLS descriptors,
2403 it's not incremented, so in order to compute the space reserved
2404 for them, it suffices to multiply the reloc count by the jump
2405 slot size. */
2406 if (htab->elf.srelplt)
2407 htab->sgotplt_jump_table_size
2408 = elf_x86_64_compute_jump_table_size (htab);
2409
2410 if (htab->tlsdesc_plt)
2411 {
2412 /* If we're not using lazy TLS relocations, don't generate the
2413 PLT and GOT entries they require. */
2414 if ((info->flags & DF_BIND_NOW))
2415 htab->tlsdesc_plt = 0;
2416 else
2417 {
2418 htab->tlsdesc_got = htab->elf.sgot->size;
2419 htab->elf.sgot->size += GOT_ENTRY_SIZE;
2420 /* Reserve room for the initial entry.
2421 FIXME: we could probably do away with it in this case. */
2422 if (htab->elf.splt->size == 0)
2423 htab->elf.splt->size += PLT_ENTRY_SIZE;
2424 htab->tlsdesc_plt = htab->elf.splt->size;
2425 htab->elf.splt->size += PLT_ENTRY_SIZE;
2426 }
2427 }
2428
2429 if (htab->elf.sgotplt)
2430 {
2431 struct elf_link_hash_entry *got;
2432 got = elf_link_hash_lookup (elf_hash_table (info),
2433 "_GLOBAL_OFFSET_TABLE_",
2434 FALSE, FALSE, FALSE);
2435
2436 /* Don't allocate .got.plt section if there are no GOT nor PLT
2437 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2438 if ((got == NULL
2439 || !got->ref_regular_nonweak)
2440 && (htab->elf.sgotplt->size
2441 == get_elf_backend_data (output_bfd)->got_header_size)
2442 && (htab->elf.splt == NULL
2443 || htab->elf.splt->size == 0)
2444 && (htab->elf.sgot == NULL
2445 || htab->elf.sgot->size == 0)
2446 && (htab->elf.iplt == NULL
2447 || htab->elf.iplt->size == 0)
2448 && (htab->elf.igotplt == NULL
2449 || htab->elf.igotplt->size == 0))
2450 htab->elf.sgotplt->size = 0;
2451 }
2452
2453 /* We now have determined the sizes of the various dynamic sections.
2454 Allocate memory for them. */
2455 relocs = FALSE;
2456 for (s = dynobj->sections; s != NULL; s = s->next)
2457 {
2458 if ((s->flags & SEC_LINKER_CREATED) == 0)
2459 continue;
2460
2461 if (s == htab->elf.splt
2462 || s == htab->elf.sgot
2463 || s == htab->elf.sgotplt
2464 || s == htab->elf.iplt
2465 || s == htab->elf.igotplt
2466 || s == htab->sdynbss)
2467 {
2468 /* Strip this section if we don't need it; see the
2469 comment below. */
2470 }
2471 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2472 {
2473 if (s->size != 0 && s != htab->elf.srelplt)
2474 relocs = TRUE;
2475
2476 /* We use the reloc_count field as a counter if we need
2477 to copy relocs into the output file. */
2478 if (s != htab->elf.srelplt)
2479 s->reloc_count = 0;
2480 }
2481 else
2482 {
2483 /* It's not one of our sections, so don't allocate space. */
2484 continue;
2485 }
2486
2487 if (s->size == 0)
2488 {
2489 /* If we don't need this section, strip it from the
2490 output file. This is mostly to handle .rela.bss and
2491 .rela.plt. We must create both sections in
2492 create_dynamic_sections, because they must be created
2493 before the linker maps input sections to output
2494 sections. The linker does that before
2495 adjust_dynamic_symbol is called, and it is that
2496 function which decides whether anything needs to go
2497 into these sections. */
2498
2499 s->flags |= SEC_EXCLUDE;
2500 continue;
2501 }
2502
2503 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2504 continue;
2505
2506 /* Allocate memory for the section contents. We use bfd_zalloc
2507 here in case unused entries are not reclaimed before the
2508 section's contents are written out. This should not happen,
2509 but this way if it does, we get a R_X86_64_NONE reloc instead
2510 of garbage. */
2511 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2512 if (s->contents == NULL)
2513 return FALSE;
2514 }
2515
2516 if (htab->elf.dynamic_sections_created)
2517 {
2518 /* Add some entries to the .dynamic section. We fill in the
2519 values later, in elf_x86_64_finish_dynamic_sections, but we
2520 must add the entries now so that we get the correct size for
2521 the .dynamic section. The DT_DEBUG entry is filled in by the
2522 dynamic linker and used by the debugger. */
2523 #define add_dynamic_entry(TAG, VAL) \
2524 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2525
2526 if (info->executable)
2527 {
2528 if (!add_dynamic_entry (DT_DEBUG, 0))
2529 return FALSE;
2530 }
2531
2532 if (htab->elf.splt->size != 0)
2533 {
2534 if (!add_dynamic_entry (DT_PLTGOT, 0)
2535 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2536 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2537 || !add_dynamic_entry (DT_JMPREL, 0))
2538 return FALSE;
2539
2540 if (htab->tlsdesc_plt
2541 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
2542 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
2543 return FALSE;
2544 }
2545
2546 if (relocs)
2547 {
2548 if (!add_dynamic_entry (DT_RELA, 0)
2549 || !add_dynamic_entry (DT_RELASZ, 0)
2550 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
2551 return FALSE;
2552
2553 /* If any dynamic relocs apply to a read-only section,
2554 then we need a DT_TEXTREL entry. */
2555 if ((info->flags & DF_TEXTREL) == 0)
2556 elf_link_hash_traverse (&htab->elf,
2557 elf_x86_64_readonly_dynrelocs,
2558 info);
2559
2560 if ((info->flags & DF_TEXTREL) != 0)
2561 {
2562 if (!add_dynamic_entry (DT_TEXTREL, 0))
2563 return FALSE;
2564 }
2565 }
2566 }
2567 #undef add_dynamic_entry
2568
2569 return TRUE;
2570 }
2571
2572 static bfd_boolean
2573 elf_x86_64_always_size_sections (bfd *output_bfd,
2574 struct bfd_link_info *info)
2575 {
2576 asection *tls_sec = elf_hash_table (info)->tls_sec;
2577
2578 if (tls_sec)
2579 {
2580 struct elf_link_hash_entry *tlsbase;
2581
2582 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2583 "_TLS_MODULE_BASE_",
2584 FALSE, FALSE, FALSE);
2585
2586 if (tlsbase && tlsbase->type == STT_TLS)
2587 {
2588 struct elf_x86_64_link_hash_table *htab;
2589 struct bfd_link_hash_entry *bh = NULL;
2590 const struct elf_backend_data *bed
2591 = get_elf_backend_data (output_bfd);
2592
2593 htab = elf_x86_64_hash_table (info);
2594 if (htab == NULL)
2595 return FALSE;
2596
2597 if (!(_bfd_generic_link_add_one_symbol
2598 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2599 tls_sec, 0, NULL, FALSE,
2600 bed->collect, &bh)))
2601 return FALSE;
2602
2603 htab->tls_module_base = bh;
2604
2605 tlsbase = (struct elf_link_hash_entry *)bh;
2606 tlsbase->def_regular = 1;
2607 tlsbase->other = STV_HIDDEN;
2608 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2609 }
2610 }
2611
2612 return TRUE;
2613 }
2614
2615 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2616 executables. Rather than setting it to the beginning of the TLS
2617 section, we have to set it to the end. This function may be called
2618 multiple times, it is idempotent. */
2619
2620 static void
2621 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
2622 {
2623 struct elf_x86_64_link_hash_table *htab;
2624 struct bfd_link_hash_entry *base;
2625
2626 if (!info->executable)
2627 return;
2628
2629 htab = elf_x86_64_hash_table (info);
2630 if (htab == NULL)
2631 return;
2632
2633 base = htab->tls_module_base;
2634 if (base == NULL)
2635 return;
2636
2637 base->u.def.value = htab->elf.tls_size;
2638 }
2639
2640 /* Return the base VMA address which should be subtracted from real addresses
2641 when resolving @dtpoff relocation.
2642 This is PT_TLS segment p_vaddr. */
2643
2644 static bfd_vma
2645 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
2646 {
2647 /* If tls_sec is NULL, we should have signalled an error already. */
2648 if (elf_hash_table (info)->tls_sec == NULL)
2649 return 0;
2650 return elf_hash_table (info)->tls_sec->vma;
2651 }
2652
2653 /* Return the relocation value for @tpoff relocation
2654 if STT_TLS virtual address is ADDRESS. */
2655
2656 static bfd_vma
2657 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
2658 {
2659 struct elf_link_hash_table *htab = elf_hash_table (info);
2660 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2661 bfd_vma static_tls_size;
2662
2663 /* If tls_segment is NULL, we should have signalled an error already. */
2664 if (htab->tls_sec == NULL)
2665 return 0;
2666
2667 /* Consider special static TLS alignment requirements. */
2668 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2669 return address - static_tls_size - htab->tls_sec->vma;
2670 }
2671
2672 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2673 branch? */
2674
2675 static bfd_boolean
2676 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
2677 {
2678 /* Opcode Instruction
2679 0xe8 call
2680 0xe9 jump
2681 0x0f 0x8x conditional jump */
2682 return ((offset > 0
2683 && (contents [offset - 1] == 0xe8
2684 || contents [offset - 1] == 0xe9))
2685 || (offset > 1
2686 && contents [offset - 2] == 0x0f
2687 && (contents [offset - 1] & 0xf0) == 0x80));
2688 }
2689
2690 /* Relocate an x86_64 ELF section. */
2691
2692 static bfd_boolean
2693 elf_x86_64_relocate_section (bfd *output_bfd,
2694 struct bfd_link_info *info,
2695 bfd *input_bfd,
2696 asection *input_section,
2697 bfd_byte *contents,
2698 Elf_Internal_Rela *relocs,
2699 Elf_Internal_Sym *local_syms,
2700 asection **local_sections)
2701 {
2702 struct elf_x86_64_link_hash_table *htab;
2703 Elf_Internal_Shdr *symtab_hdr;
2704 struct elf_link_hash_entry **sym_hashes;
2705 bfd_vma *local_got_offsets;
2706 bfd_vma *local_tlsdesc_gotents;
2707 Elf_Internal_Rela *rel;
2708 Elf_Internal_Rela *relend;
2709
2710 BFD_ASSERT (is_x86_64_elf (input_bfd));
2711
2712 htab = elf_x86_64_hash_table (info);
2713 if (htab == NULL)
2714 return FALSE;
2715 symtab_hdr = &elf_symtab_hdr (input_bfd);
2716 sym_hashes = elf_sym_hashes (input_bfd);
2717 local_got_offsets = elf_local_got_offsets (input_bfd);
2718 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
2719
2720 elf_x86_64_set_tls_module_base (info);
2721
2722 rel = relocs;
2723 relend = relocs + input_section->reloc_count;
2724 for (; rel < relend; rel++)
2725 {
2726 unsigned int r_type;
2727 reloc_howto_type *howto;
2728 unsigned long r_symndx;
2729 struct elf_link_hash_entry *h;
2730 Elf_Internal_Sym *sym;
2731 asection *sec;
2732 bfd_vma off, offplt;
2733 bfd_vma relocation;
2734 bfd_boolean unresolved_reloc;
2735 bfd_reloc_status_type r;
2736 int tls_type;
2737 asection *base_got;
2738
2739 r_type = ELF32_R_TYPE (rel->r_info);
2740 if (r_type == (int) R_X86_64_GNU_VTINHERIT
2741 || r_type == (int) R_X86_64_GNU_VTENTRY)
2742 continue;
2743
2744 if (r_type >= R_X86_64_max)
2745 {
2746 bfd_set_error (bfd_error_bad_value);
2747 return FALSE;
2748 }
2749
2750 howto = x86_64_elf_howto_table + r_type;
2751 r_symndx = htab->r_sym (rel->r_info);
2752 h = NULL;
2753 sym = NULL;
2754 sec = NULL;
2755 unresolved_reloc = FALSE;
2756 if (r_symndx < symtab_hdr->sh_info)
2757 {
2758 sym = local_syms + r_symndx;
2759 sec = local_sections[r_symndx];
2760
2761 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
2762 &sec, rel);
2763
2764 /* Relocate against local STT_GNU_IFUNC symbol. */
2765 if (!info->relocatable
2766 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2767 {
2768 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
2769 rel, FALSE);
2770 if (h == NULL)
2771 abort ();
2772
2773 /* Set STT_GNU_IFUNC symbol value. */
2774 h->root.u.def.value = sym->st_value;
2775 h->root.u.def.section = sec;
2776 }
2777 }
2778 else
2779 {
2780 bfd_boolean warned ATTRIBUTE_UNUSED;
2781
2782 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2783 r_symndx, symtab_hdr, sym_hashes,
2784 h, sec, relocation,
2785 unresolved_reloc, warned);
2786 }
2787
2788 if (sec != NULL && elf_discarded_section (sec))
2789 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2790 rel, relend, howto, contents);
2791
2792 if (info->relocatable)
2793 continue;
2794
2795 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2796 it here if it is defined in a non-shared object. */
2797 if (h != NULL
2798 && h->type == STT_GNU_IFUNC
2799 && h->def_regular)
2800 {
2801 asection *plt;
2802 bfd_vma plt_index;
2803 const char *name;
2804
2805 if ((input_section->flags & SEC_ALLOC) == 0
2806 || h->plt.offset == (bfd_vma) -1)
2807 abort ();
2808
2809 /* STT_GNU_IFUNC symbol must go through PLT. */
2810 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
2811 relocation = (plt->output_section->vma
2812 + plt->output_offset + h->plt.offset);
2813
2814 switch (r_type)
2815 {
2816 default:
2817 if (h->root.root.string)
2818 name = h->root.root.string;
2819 else
2820 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2821 NULL);
2822 (*_bfd_error_handler)
2823 (_("%B: relocation %s against STT_GNU_IFUNC "
2824 "symbol `%s' isn't handled by %s"), input_bfd,
2825 x86_64_elf_howto_table[r_type].name,
2826 name, __FUNCTION__);
2827 bfd_set_error (bfd_error_bad_value);
2828 return FALSE;
2829
2830 case R_X86_64_32S:
2831 if (info->shared)
2832 abort ();
2833 goto do_relocation;
2834
2835 case R_X86_64_64:
2836 if (rel->r_addend != 0)
2837 {
2838 if (h->root.root.string)
2839 name = h->root.root.string;
2840 else
2841 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
2842 sym, NULL);
2843 (*_bfd_error_handler)
2844 (_("%B: relocation %s against STT_GNU_IFUNC "
2845 "symbol `%s' has non-zero addend: %d"),
2846 input_bfd, x86_64_elf_howto_table[r_type].name,
2847 name, rel->r_addend);
2848 bfd_set_error (bfd_error_bad_value);
2849 return FALSE;
2850 }
2851
2852 /* Generate dynamic relcoation only when there is a
2853 non-GOF reference in a shared object. */
2854 if (info->shared && h->non_got_ref)
2855 {
2856 Elf_Internal_Rela outrel;
2857 asection *sreloc;
2858
2859 /* Need a dynamic relocation to get the real function
2860 address. */
2861 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2862 info,
2863 input_section,
2864 rel->r_offset);
2865 if (outrel.r_offset == (bfd_vma) -1
2866 || outrel.r_offset == (bfd_vma) -2)
2867 abort ();
2868
2869 outrel.r_offset += (input_section->output_section->vma
2870 + input_section->output_offset);
2871
2872 if (h->dynindx == -1
2873 || h->forced_local
2874 || info->executable)
2875 {
2876 /* This symbol is resolved locally. */
2877 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
2878 outrel.r_addend = (h->root.u.def.value
2879 + h->root.u.def.section->output_section->vma
2880 + h->root.u.def.section->output_offset);
2881 }
2882 else
2883 {
2884 outrel.r_info = htab->r_info (h->dynindx, r_type);
2885 outrel.r_addend = 0;
2886 }
2887
2888 sreloc = htab->elf.irelifunc;
2889 elf_append_rela (output_bfd, sreloc, &outrel);
2890
2891 /* If this reloc is against an external symbol, we
2892 do not want to fiddle with the addend. Otherwise,
2893 we need to include the symbol value so that it
2894 becomes an addend for the dynamic reloc. For an
2895 internal symbol, we have updated addend. */
2896 continue;
2897 }
2898
2899 case R_X86_64_32:
2900 case R_X86_64_PC32:
2901 case R_X86_64_PC64:
2902 case R_X86_64_PLT32:
2903 goto do_relocation;
2904
2905 case R_X86_64_GOTPCREL:
2906 case R_X86_64_GOTPCREL64:
2907 base_got = htab->elf.sgot;
2908 off = h->got.offset;
2909
2910 if (base_got == NULL)
2911 abort ();
2912
2913 if (off == (bfd_vma) -1)
2914 {
2915 /* We can't use h->got.offset here to save state, or
2916 even just remember the offset, as finish_dynamic_symbol
2917 would use that as offset into .got. */
2918
2919 if (htab->elf.splt != NULL)
2920 {
2921 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2922 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2923 base_got = htab->elf.sgotplt;
2924 }
2925 else
2926 {
2927 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2928 off = plt_index * GOT_ENTRY_SIZE;
2929 base_got = htab->elf.igotplt;
2930 }
2931
2932 if (h->dynindx == -1
2933 || h->forced_local
2934 || info->symbolic)
2935 {
2936 /* This references the local defitionion. We must
2937 initialize this entry in the global offset table.
2938 Since the offset must always be a multiple of 8,
2939 we use the least significant bit to record
2940 whether we have initialized it already.
2941
2942 When doing a dynamic link, we create a .rela.got
2943 relocation entry to initialize the value. This
2944 is done in the finish_dynamic_symbol routine. */
2945 if ((off & 1) != 0)
2946 off &= ~1;
2947 else
2948 {
2949 bfd_put_64 (output_bfd, relocation,
2950 base_got->contents + off);
2951 /* Note that this is harmless for the GOTPLT64
2952 case, as -1 | 1 still is -1. */
2953 h->got.offset |= 1;
2954 }
2955 }
2956 }
2957
2958 relocation = (base_got->output_section->vma
2959 + base_got->output_offset + off);
2960
2961 if (r_type != R_X86_64_GOTPCREL
2962 && r_type != R_X86_64_GOTPCREL64)
2963 {
2964 asection *gotplt;
2965 if (htab->elf.splt != NULL)
2966 gotplt = htab->elf.sgotplt;
2967 else
2968 gotplt = htab->elf.igotplt;
2969 relocation -= (gotplt->output_section->vma
2970 - gotplt->output_offset);
2971 }
2972
2973 goto do_relocation;
2974 }
2975 }
2976
2977 /* When generating a shared object, the relocations handled here are
2978 copied into the output file to be resolved at run time. */
2979 switch (r_type)
2980 {
2981 case R_X86_64_GOT32:
2982 case R_X86_64_GOT64:
2983 /* Relocation is to the entry for this symbol in the global
2984 offset table. */
2985 case R_X86_64_GOTPCREL:
2986 case R_X86_64_GOTPCREL64:
2987 /* Use global offset table entry as symbol value. */
2988 case R_X86_64_GOTPLT64:
2989 /* This is the same as GOT64 for relocation purposes, but
2990 indicates the existence of a PLT entry. The difficulty is,
2991 that we must calculate the GOT slot offset from the PLT
2992 offset, if this symbol got a PLT entry (it was global).
2993 Additionally if it's computed from the PLT entry, then that
2994 GOT offset is relative to .got.plt, not to .got. */
2995 base_got = htab->elf.sgot;
2996
2997 if (htab->elf.sgot == NULL)
2998 abort ();
2999
3000 if (h != NULL)
3001 {
3002 bfd_boolean dyn;
3003
3004 off = h->got.offset;
3005 if (h->needs_plt
3006 && h->plt.offset != (bfd_vma)-1
3007 && off == (bfd_vma)-1)
3008 {
3009 /* We can't use h->got.offset here to save
3010 state, or even just remember the offset, as
3011 finish_dynamic_symbol would use that as offset into
3012 .got. */
3013 bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3014 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3015 base_got = htab->elf.sgotplt;
3016 }
3017
3018 dyn = htab->elf.dynamic_sections_created;
3019
3020 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3021 || (info->shared
3022 && SYMBOL_REFERENCES_LOCAL (info, h))
3023 || (ELF_ST_VISIBILITY (h->other)
3024 && h->root.type == bfd_link_hash_undefweak))
3025 {
3026 /* This is actually a static link, or it is a -Bsymbolic
3027 link and the symbol is defined locally, or the symbol
3028 was forced to be local because of a version file. We
3029 must initialize this entry in the global offset table.
3030 Since the offset must always be a multiple of 8, we
3031 use the least significant bit to record whether we
3032 have initialized it already.
3033
3034 When doing a dynamic link, we create a .rela.got
3035 relocation entry to initialize the value. This is
3036 done in the finish_dynamic_symbol routine. */
3037 if ((off & 1) != 0)
3038 off &= ~1;
3039 else
3040 {
3041 bfd_put_64 (output_bfd, relocation,
3042 base_got->contents + off);
3043 /* Note that this is harmless for the GOTPLT64 case,
3044 as -1 | 1 still is -1. */
3045 h->got.offset |= 1;
3046 }
3047 }
3048 else
3049 unresolved_reloc = FALSE;
3050 }
3051 else
3052 {
3053 if (local_got_offsets == NULL)
3054 abort ();
3055
3056 off = local_got_offsets[r_symndx];
3057
3058 /* The offset must always be a multiple of 8. We use
3059 the least significant bit to record whether we have
3060 already generated the necessary reloc. */
3061 if ((off & 1) != 0)
3062 off &= ~1;
3063 else
3064 {
3065 bfd_put_64 (output_bfd, relocation,
3066 base_got->contents + off);
3067
3068 if (info->shared)
3069 {
3070 asection *s;
3071 Elf_Internal_Rela outrel;
3072
3073 /* We need to generate a R_X86_64_RELATIVE reloc
3074 for the dynamic linker. */
3075 s = htab->elf.srelgot;
3076 if (s == NULL)
3077 abort ();
3078
3079 outrel.r_offset = (base_got->output_section->vma
3080 + base_got->output_offset
3081 + off);
3082 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3083 outrel.r_addend = relocation;
3084 elf_append_rela (output_bfd, s, &outrel);
3085 }
3086
3087 local_got_offsets[r_symndx] |= 1;
3088 }
3089 }
3090
3091 if (off >= (bfd_vma) -2)
3092 abort ();
3093
3094 relocation = base_got->output_section->vma
3095 + base_got->output_offset + off;
3096 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3097 relocation -= htab->elf.sgotplt->output_section->vma
3098 - htab->elf.sgotplt->output_offset;
3099
3100 break;
3101
3102 case R_X86_64_GOTOFF64:
3103 /* Relocation is relative to the start of the global offset
3104 table. */
3105
3106 /* Check to make sure it isn't a protected function symbol
3107 for shared library since it may not be local when used
3108 as function address. */
3109 if (info->shared
3110 && h
3111 && h->def_regular
3112 && h->type == STT_FUNC
3113 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3114 {
3115 (*_bfd_error_handler)
3116 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3117 input_bfd, h->root.root.string);
3118 bfd_set_error (bfd_error_bad_value);
3119 return FALSE;
3120 }
3121
3122 /* Note that sgot is not involved in this
3123 calculation. We always want the start of .got.plt. If we
3124 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3125 permitted by the ABI, we might have to change this
3126 calculation. */
3127 relocation -= htab->elf.sgotplt->output_section->vma
3128 + htab->elf.sgotplt->output_offset;
3129 break;
3130
3131 case R_X86_64_GOTPC32:
3132 case R_X86_64_GOTPC64:
3133 /* Use global offset table as symbol value. */
3134 relocation = htab->elf.sgotplt->output_section->vma
3135 + htab->elf.sgotplt->output_offset;
3136 unresolved_reloc = FALSE;
3137 break;
3138
3139 case R_X86_64_PLTOFF64:
3140 /* Relocation is PLT entry relative to GOT. For local
3141 symbols it's the symbol itself relative to GOT. */
3142 if (h != NULL
3143 /* See PLT32 handling. */
3144 && h->plt.offset != (bfd_vma) -1
3145 && htab->elf.splt != NULL)
3146 {
3147 relocation = (htab->elf.splt->output_section->vma
3148 + htab->elf.splt->output_offset
3149 + h->plt.offset);
3150 unresolved_reloc = FALSE;
3151 }
3152
3153 relocation -= htab->elf.sgotplt->output_section->vma
3154 + htab->elf.sgotplt->output_offset;
3155 break;
3156
3157 case R_X86_64_PLT32:
3158 /* Relocation is to the entry for this symbol in the
3159 procedure linkage table. */
3160
3161 /* Resolve a PLT32 reloc against a local symbol directly,
3162 without using the procedure linkage table. */
3163 if (h == NULL)
3164 break;
3165
3166 if (h->plt.offset == (bfd_vma) -1
3167 || htab->elf.splt == NULL)
3168 {
3169 /* We didn't make a PLT entry for this symbol. This
3170 happens when statically linking PIC code, or when
3171 using -Bsymbolic. */
3172 break;
3173 }
3174
3175 relocation = (htab->elf.splt->output_section->vma
3176 + htab->elf.splt->output_offset
3177 + h->plt.offset);
3178 unresolved_reloc = FALSE;
3179 break;
3180
3181 case R_X86_64_PC8:
3182 case R_X86_64_PC16:
3183 case R_X86_64_PC32:
3184 if (info->shared
3185 && ABI_64_P (output_bfd)
3186 && (input_section->flags & SEC_ALLOC) != 0
3187 && (input_section->flags & SEC_READONLY) != 0
3188 && h != NULL)
3189 {
3190 bfd_boolean fail = FALSE;
3191 bfd_boolean branch
3192 = (r_type == R_X86_64_PC32
3193 && is_32bit_relative_branch (contents, rel->r_offset));
3194
3195 if (SYMBOL_REFERENCES_LOCAL (info, h))
3196 {
3197 /* Symbol is referenced locally. Make sure it is
3198 defined locally or for a branch. */
3199 fail = !h->def_regular && !branch;
3200 }
3201 else
3202 {
3203 /* Symbol isn't referenced locally. We only allow
3204 branch to symbol with non-default visibility. */
3205 fail = (!branch
3206 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3207 }
3208
3209 if (fail)
3210 {
3211 const char *fmt;
3212 const char *v;
3213 const char *pic = "";
3214
3215 switch (ELF_ST_VISIBILITY (h->other))
3216 {
3217 case STV_HIDDEN:
3218 v = _("hidden symbol");
3219 break;
3220 case STV_INTERNAL:
3221 v = _("internal symbol");
3222 break;
3223 case STV_PROTECTED:
3224 v = _("protected symbol");
3225 break;
3226 default:
3227 v = _("symbol");
3228 pic = _("; recompile with -fPIC");
3229 break;
3230 }
3231
3232 if (h->def_regular)
3233 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3234 else
3235 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3236
3237 (*_bfd_error_handler) (fmt, input_bfd,
3238 x86_64_elf_howto_table[r_type].name,
3239 v, h->root.root.string, pic);
3240 bfd_set_error (bfd_error_bad_value);
3241 return FALSE;
3242 }
3243 }
3244 /* Fall through. */
3245
3246 case R_X86_64_8:
3247 case R_X86_64_16:
3248 case R_X86_64_32:
3249 case R_X86_64_PC64:
3250 case R_X86_64_64:
3251 /* FIXME: The ABI says the linker should make sure the value is
3252 the same when it's zeroextended to 64 bit. */
3253
3254 if ((input_section->flags & SEC_ALLOC) == 0)
3255 break;
3256
3257 if ((info->shared
3258 && (h == NULL
3259 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3260 || h->root.type != bfd_link_hash_undefweak)
3261 && (! IS_X86_64_PCREL_TYPE (r_type)
3262 || ! SYMBOL_CALLS_LOCAL (info, h)))
3263 || (ELIMINATE_COPY_RELOCS
3264 && !info->shared
3265 && h != NULL
3266 && h->dynindx != -1
3267 && !h->non_got_ref
3268 && ((h->def_dynamic
3269 && !h->def_regular)
3270 || h->root.type == bfd_link_hash_undefweak
3271 || h->root.type == bfd_link_hash_undefined)))
3272 {
3273 Elf_Internal_Rela outrel;
3274 bfd_boolean skip, relocate;
3275 asection *sreloc;
3276
3277 /* When generating a shared object, these relocations
3278 are copied into the output file to be resolved at run
3279 time. */
3280 skip = FALSE;
3281 relocate = FALSE;
3282
3283 outrel.r_offset =
3284 _bfd_elf_section_offset (output_bfd, info, input_section,
3285 rel->r_offset);
3286 if (outrel.r_offset == (bfd_vma) -1)
3287 skip = TRUE;
3288 else if (outrel.r_offset == (bfd_vma) -2)
3289 skip = TRUE, relocate = TRUE;
3290
3291 outrel.r_offset += (input_section->output_section->vma
3292 + input_section->output_offset);
3293
3294 if (skip)
3295 memset (&outrel, 0, sizeof outrel);
3296
3297 /* h->dynindx may be -1 if this symbol was marked to
3298 become local. */
3299 else if (h != NULL
3300 && h->dynindx != -1
3301 && (IS_X86_64_PCREL_TYPE (r_type)
3302 || ! info->shared
3303 || ! SYMBOLIC_BIND (info, h)
3304 || ! h->def_regular))
3305 {
3306 outrel.r_info = htab->r_info (h->dynindx, r_type);
3307 outrel.r_addend = rel->r_addend;
3308 }
3309 else
3310 {
3311 /* This symbol is local, or marked to become local. */
3312 if (r_type == R_X86_64_64)
3313 {
3314 relocate = TRUE;
3315 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3316 outrel.r_addend = relocation + rel->r_addend;
3317 }
3318 else
3319 {
3320 long sindx;
3321
3322 if (bfd_is_abs_section (sec))
3323 sindx = 0;
3324 else if (sec == NULL || sec->owner == NULL)
3325 {
3326 bfd_set_error (bfd_error_bad_value);
3327 return FALSE;
3328 }
3329 else
3330 {
3331 asection *osec;
3332
3333 /* We are turning this relocation into one
3334 against a section symbol. It would be
3335 proper to subtract the symbol's value,
3336 osec->vma, from the emitted reloc addend,
3337 but ld.so expects buggy relocs. */
3338 osec = sec->output_section;
3339 sindx = elf_section_data (osec)->dynindx;
3340 if (sindx == 0)
3341 {
3342 asection *oi = htab->elf.text_index_section;
3343 sindx = elf_section_data (oi)->dynindx;
3344 }
3345 BFD_ASSERT (sindx != 0);
3346 }
3347
3348 outrel.r_info = htab->r_info (sindx, r_type);
3349 outrel.r_addend = relocation + rel->r_addend;
3350 }
3351 }
3352
3353 sreloc = elf_section_data (input_section)->sreloc;
3354
3355 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3356
3357 elf_append_rela (output_bfd, sreloc, &outrel);
3358
3359 /* If this reloc is against an external symbol, we do
3360 not want to fiddle with the addend. Otherwise, we
3361 need to include the symbol value so that it becomes
3362 an addend for the dynamic reloc. */
3363 if (! relocate)
3364 continue;
3365 }
3366
3367 break;
3368
3369 case R_X86_64_TLSGD:
3370 case R_X86_64_GOTPC32_TLSDESC:
3371 case R_X86_64_TLSDESC_CALL:
3372 case R_X86_64_GOTTPOFF:
3373 tls_type = GOT_UNKNOWN;
3374 if (h == NULL && local_got_offsets)
3375 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3376 else if (h != NULL)
3377 tls_type = elf_x86_64_hash_entry (h)->tls_type;
3378
3379 if (! elf_x86_64_tls_transition (info, input_bfd,
3380 input_section, contents,
3381 symtab_hdr, sym_hashes,
3382 &r_type, tls_type, rel,
3383 relend, h, r_symndx))
3384 return FALSE;
3385
3386 if (r_type == R_X86_64_TPOFF32)
3387 {
3388 bfd_vma roff = rel->r_offset;
3389
3390 BFD_ASSERT (! unresolved_reloc);
3391
3392 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3393 {
3394 /* GD->LE transition.
3395 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3396 .word 0x6666; rex64; call __tls_get_addr
3397 Change it into:
3398 movq %fs:0, %rax
3399 leaq foo@tpoff(%rax), %rax */
3400 memcpy (contents + roff - 4,
3401 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3402 16);
3403 bfd_put_32 (output_bfd,
3404 elf_x86_64_tpoff (info, relocation),
3405 contents + roff + 8);
3406 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3407 rel++;
3408 continue;
3409 }
3410 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3411 {
3412 /* GDesc -> LE transition.
3413 It's originally something like:
3414 leaq x@tlsdesc(%rip), %rax
3415
3416 Change it to:
3417 movl $x@tpoff, %rax. */
3418
3419 unsigned int val, type;
3420
3421 type = bfd_get_8 (input_bfd, contents + roff - 3);
3422 val = bfd_get_8 (input_bfd, contents + roff - 1);
3423 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3424 contents + roff - 3);
3425 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3426 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3427 contents + roff - 1);
3428 bfd_put_32 (output_bfd,
3429 elf_x86_64_tpoff (info, relocation),
3430 contents + roff);
3431 continue;
3432 }
3433 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3434 {
3435 /* GDesc -> LE transition.
3436 It's originally:
3437 call *(%rax)
3438 Turn it into:
3439 xchg %ax,%ax. */
3440 bfd_put_8 (output_bfd, 0x66, contents + roff);
3441 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3442 continue;
3443 }
3444 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
3445 {
3446 /* IE->LE transition:
3447 Originally it can be one of:
3448 movq foo@gottpoff(%rip), %reg
3449 addq foo@gottpoff(%rip), %reg
3450 We change it into:
3451 movq $foo, %reg
3452 leaq foo(%reg), %reg
3453 addq $foo, %reg. */
3454
3455 unsigned int val, type, reg;
3456
3457 val = bfd_get_8 (input_bfd, contents + roff - 3);
3458 type = bfd_get_8 (input_bfd, contents + roff - 2);
3459 reg = bfd_get_8 (input_bfd, contents + roff - 1);
3460 reg >>= 3;
3461 if (type == 0x8b)
3462 {
3463 /* movq */
3464 if (val == 0x4c)
3465 bfd_put_8 (output_bfd, 0x49,
3466 contents + roff - 3);
3467 bfd_put_8 (output_bfd, 0xc7,
3468 contents + roff - 2);
3469 bfd_put_8 (output_bfd, 0xc0 | reg,
3470 contents + roff - 1);
3471 }
3472 else if (reg == 4)
3473 {
3474 /* addq -> addq - addressing with %rsp/%r12 is
3475 special */
3476 if (val == 0x4c)
3477 bfd_put_8 (output_bfd, 0x49,
3478 contents + roff - 3);
3479 bfd_put_8 (output_bfd, 0x81,
3480 contents + roff - 2);
3481 bfd_put_8 (output_bfd, 0xc0 | reg,
3482 contents + roff - 1);
3483 }
3484 else
3485 {
3486 /* addq -> leaq */
3487 if (val == 0x4c)
3488 bfd_put_8 (output_bfd, 0x4d,
3489 contents + roff - 3);
3490 bfd_put_8 (output_bfd, 0x8d,
3491 contents + roff - 2);
3492 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
3493 contents + roff - 1);
3494 }
3495 bfd_put_32 (output_bfd,
3496 elf_x86_64_tpoff (info, relocation),
3497 contents + roff);
3498 continue;
3499 }
3500 else
3501 BFD_ASSERT (FALSE);
3502 }
3503
3504 if (htab->elf.sgot == NULL)
3505 abort ();
3506
3507 if (h != NULL)
3508 {
3509 off = h->got.offset;
3510 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
3511 }
3512 else
3513 {
3514 if (local_got_offsets == NULL)
3515 abort ();
3516
3517 off = local_got_offsets[r_symndx];
3518 offplt = local_tlsdesc_gotents[r_symndx];
3519 }
3520
3521 if ((off & 1) != 0)
3522 off &= ~1;
3523 else
3524 {
3525 Elf_Internal_Rela outrel;
3526 int dr_type, indx;
3527 asection *sreloc;
3528
3529 if (htab->elf.srelgot == NULL)
3530 abort ();
3531
3532 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3533
3534 if (GOT_TLS_GDESC_P (tls_type))
3535 {
3536 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
3537 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
3538 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
3539 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3540 + htab->elf.sgotplt->output_offset
3541 + offplt
3542 + htab->sgotplt_jump_table_size);
3543 sreloc = htab->elf.srelplt;
3544 if (indx == 0)
3545 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
3546 else
3547 outrel.r_addend = 0;
3548 elf_append_rela (output_bfd, sreloc, &outrel);
3549 }
3550
3551 sreloc = htab->elf.srelgot;
3552
3553 outrel.r_offset = (htab->elf.sgot->output_section->vma
3554 + htab->elf.sgot->output_offset + off);
3555
3556 if (GOT_TLS_GD_P (tls_type))
3557 dr_type = R_X86_64_DTPMOD64;
3558 else if (GOT_TLS_GDESC_P (tls_type))
3559 goto dr_done;
3560 else
3561 dr_type = R_X86_64_TPOFF64;
3562
3563 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
3564 outrel.r_addend = 0;
3565 if ((dr_type == R_X86_64_TPOFF64
3566 || dr_type == R_X86_64_TLSDESC) && indx == 0)
3567 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
3568 outrel.r_info = htab->r_info (indx, dr_type);
3569
3570 elf_append_rela (output_bfd, sreloc, &outrel);
3571
3572 if (GOT_TLS_GD_P (tls_type))
3573 {
3574 if (indx == 0)
3575 {
3576 BFD_ASSERT (! unresolved_reloc);
3577 bfd_put_64 (output_bfd,
3578 relocation - elf_x86_64_dtpoff_base (info),
3579 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3580 }
3581 else
3582 {
3583 bfd_put_64 (output_bfd, 0,
3584 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3585 outrel.r_info = htab->r_info (indx,
3586 R_X86_64_DTPOFF64);
3587 outrel.r_offset += GOT_ENTRY_SIZE;
3588 elf_append_rela (output_bfd, sreloc,
3589 &outrel);
3590 }
3591 }
3592
3593 dr_done:
3594 if (h != NULL)
3595 h->got.offset |= 1;
3596 else
3597 local_got_offsets[r_symndx] |= 1;
3598 }
3599
3600 if (off >= (bfd_vma) -2
3601 && ! GOT_TLS_GDESC_P (tls_type))
3602 abort ();
3603 if (r_type == ELF32_R_TYPE (rel->r_info))
3604 {
3605 if (r_type == R_X86_64_GOTPC32_TLSDESC
3606 || r_type == R_X86_64_TLSDESC_CALL)
3607 relocation = htab->elf.sgotplt->output_section->vma
3608 + htab->elf.sgotplt->output_offset
3609 + offplt + htab->sgotplt_jump_table_size;
3610 else
3611 relocation = htab->elf.sgot->output_section->vma
3612 + htab->elf.sgot->output_offset + off;
3613 unresolved_reloc = FALSE;
3614 }
3615 else
3616 {
3617 bfd_vma roff = rel->r_offset;
3618
3619 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3620 {
3621 /* GD->IE transition.
3622 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3623 .word 0x6666; rex64; call __tls_get_addr@plt
3624 Change it into:
3625 movq %fs:0, %rax
3626 addq foo@gottpoff(%rip), %rax */
3627 memcpy (contents + roff - 4,
3628 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3629 16);
3630
3631 relocation = (htab->elf.sgot->output_section->vma
3632 + htab->elf.sgot->output_offset + off
3633 - roff
3634 - input_section->output_section->vma
3635 - input_section->output_offset
3636 - 12);
3637 bfd_put_32 (output_bfd, relocation,
3638 contents + roff + 8);
3639 /* Skip R_X86_64_PLT32. */
3640 rel++;
3641 continue;
3642 }
3643 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3644 {
3645 /* GDesc -> IE transition.
3646 It's originally something like:
3647 leaq x@tlsdesc(%rip), %rax
3648
3649 Change it to:
3650 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
3651
3652 /* Now modify the instruction as appropriate. To
3653 turn a leaq into a movq in the form we use it, it
3654 suffices to change the second byte from 0x8d to
3655 0x8b. */
3656 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3657
3658 bfd_put_32 (output_bfd,
3659 htab->elf.sgot->output_section->vma
3660 + htab->elf.sgot->output_offset + off
3661 - rel->r_offset
3662 - input_section->output_section->vma
3663 - input_section->output_offset
3664 - 4,
3665 contents + roff);
3666 continue;
3667 }
3668 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3669 {
3670 /* GDesc -> IE transition.
3671 It's originally:
3672 call *(%rax)
3673
3674 Change it to:
3675 xchg %ax, %ax. */
3676
3677 bfd_put_8 (output_bfd, 0x66, contents + roff);
3678 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3679 continue;
3680 }
3681 else
3682 BFD_ASSERT (FALSE);
3683 }
3684 break;
3685
3686 case R_X86_64_TLSLD:
3687 if (! elf_x86_64_tls_transition (info, input_bfd,
3688 input_section, contents,
3689 symtab_hdr, sym_hashes,
3690 &r_type, GOT_UNKNOWN,
3691 rel, relend, h, r_symndx))
3692 return FALSE;
3693
3694 if (r_type != R_X86_64_TLSLD)
3695 {
3696 /* LD->LE transition:
3697 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3698 We change it into:
3699 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3700
3701 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
3702 memcpy (contents + rel->r_offset - 3,
3703 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3704 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3705 rel++;
3706 continue;
3707 }
3708
3709 if (htab->elf.sgot == NULL)
3710 abort ();
3711
3712 off = htab->tls_ld_got.offset;
3713 if (off & 1)
3714 off &= ~1;
3715 else
3716 {
3717 Elf_Internal_Rela outrel;
3718
3719 if (htab->elf.srelgot == NULL)
3720 abort ();
3721
3722 outrel.r_offset = (htab->elf.sgot->output_section->vma
3723 + htab->elf.sgot->output_offset + off);
3724
3725 bfd_put_64 (output_bfd, 0,
3726 htab->elf.sgot->contents + off);
3727 bfd_put_64 (output_bfd, 0,
3728 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3729 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
3730 outrel.r_addend = 0;
3731 elf_append_rela (output_bfd, htab->elf.srelgot,
3732 &outrel);
3733 htab->tls_ld_got.offset |= 1;
3734 }
3735 relocation = htab->elf.sgot->output_section->vma
3736 + htab->elf.sgot->output_offset + off;
3737 unresolved_reloc = FALSE;
3738 break;
3739
3740 case R_X86_64_DTPOFF32:
3741 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
3742 relocation -= elf_x86_64_dtpoff_base (info);
3743 else
3744 relocation = elf_x86_64_tpoff (info, relocation);
3745 break;
3746
3747 case R_X86_64_TPOFF32:
3748 BFD_ASSERT (info->executable);
3749 relocation = elf_x86_64_tpoff (info, relocation);
3750 break;
3751
3752 default:
3753 break;
3754 }
3755
3756 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3757 because such sections are not SEC_ALLOC and thus ld.so will
3758 not process them. */
3759 if (unresolved_reloc
3760 && !((input_section->flags & SEC_DEBUGGING) != 0
3761 && h->def_dynamic))
3762 (*_bfd_error_handler)
3763 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3764 input_bfd,
3765 input_section,
3766 (long) rel->r_offset,
3767 howto->name,
3768 h->root.root.string);
3769
3770 do_relocation:
3771 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3772 contents, rel->r_offset,
3773 relocation, rel->r_addend);
3774
3775 if (r != bfd_reloc_ok)
3776 {
3777 const char *name;
3778
3779 if (h != NULL)
3780 name = h->root.root.string;
3781 else
3782 {
3783 name = bfd_elf_string_from_elf_section (input_bfd,
3784 symtab_hdr->sh_link,
3785 sym->st_name);
3786 if (name == NULL)
3787 return FALSE;
3788 if (*name == '\0')
3789 name = bfd_section_name (input_bfd, sec);
3790 }
3791
3792 if (r == bfd_reloc_overflow)
3793 {
3794 if (! ((*info->callbacks->reloc_overflow)
3795 (info, (h ? &h->root : NULL), name, howto->name,
3796 (bfd_vma) 0, input_bfd, input_section,
3797 rel->r_offset)))
3798 return FALSE;
3799 }
3800 else
3801 {
3802 (*_bfd_error_handler)
3803 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3804 input_bfd, input_section,
3805 (long) rel->r_offset, name, (int) r);
3806 return FALSE;
3807 }
3808 }
3809 }
3810
3811 return TRUE;
3812 }
3813
3814 /* Finish up dynamic symbol handling. We set the contents of various
3815 dynamic sections here. */
3816
3817 static bfd_boolean
3818 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
3819 struct bfd_link_info *info,
3820 struct elf_link_hash_entry *h,
3821 Elf_Internal_Sym *sym)
3822 {
3823 struct elf_x86_64_link_hash_table *htab;
3824
3825 htab = elf_x86_64_hash_table (info);
3826 if (htab == NULL)
3827 return FALSE;
3828
3829 if (h->plt.offset != (bfd_vma) -1)
3830 {
3831 bfd_vma plt_index;
3832 bfd_vma got_offset;
3833 Elf_Internal_Rela rela;
3834 bfd_byte *loc;
3835 asection *plt, *gotplt, *relplt;
3836 const struct elf_backend_data *bed;
3837
3838 /* When building a static executable, use .iplt, .igot.plt and
3839 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3840 if (htab->elf.splt != NULL)
3841 {
3842 plt = htab->elf.splt;
3843 gotplt = htab->elf.sgotplt;
3844 relplt = htab->elf.srelplt;
3845 }
3846 else
3847 {
3848 plt = htab->elf.iplt;
3849 gotplt = htab->elf.igotplt;
3850 relplt = htab->elf.irelplt;
3851 }
3852
3853 /* This symbol has an entry in the procedure linkage table. Set
3854 it up. */
3855 if ((h->dynindx == -1
3856 && !((h->forced_local || info->executable)
3857 && h->def_regular
3858 && h->type == STT_GNU_IFUNC))
3859 || plt == NULL
3860 || gotplt == NULL
3861 || relplt == NULL)
3862 abort ();
3863
3864 /* Get the index in the procedure linkage table which
3865 corresponds to this symbol. This is the index of this symbol
3866 in all the symbols for which we are making plt entries. The
3867 first entry in the procedure linkage table is reserved.
3868
3869 Get the offset into the .got table of the entry that
3870 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3871 bytes. The first three are reserved for the dynamic linker.
3872
3873 For static executables, we don't reserve anything. */
3874
3875 if (plt == htab->elf.splt)
3876 {
3877 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3878 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3879 }
3880 else
3881 {
3882 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3883 got_offset = plt_index * GOT_ENTRY_SIZE;
3884 }
3885
3886 /* Fill in the entry in the procedure linkage table. */
3887 memcpy (plt->contents + h->plt.offset, elf_x86_64_plt_entry,
3888 PLT_ENTRY_SIZE);
3889
3890 /* Insert the relocation positions of the plt section. The magic
3891 numbers at the end of the statements are the positions of the
3892 relocations in the plt section. */
3893 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3894 instruction uses 6 bytes, subtract this value. */
3895 bfd_put_32 (output_bfd,
3896 (gotplt->output_section->vma
3897 + gotplt->output_offset
3898 + got_offset
3899 - plt->output_section->vma
3900 - plt->output_offset
3901 - h->plt.offset
3902 - 6),
3903 plt->contents + h->plt.offset + 2);
3904
3905 /* Don't fill PLT entry for static executables. */
3906 if (plt == htab->elf.splt)
3907 {
3908 /* Put relocation index. */
3909 bfd_put_32 (output_bfd, plt_index,
3910 plt->contents + h->plt.offset + 7);
3911 /* Put offset for jmp .PLT0. */
3912 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3913 plt->contents + h->plt.offset + 12);
3914 }
3915
3916 /* Fill in the entry in the global offset table, initially this
3917 points to the pushq instruction in the PLT which is at offset 6. */
3918 bfd_put_64 (output_bfd, (plt->output_section->vma
3919 + plt->output_offset
3920 + h->plt.offset + 6),
3921 gotplt->contents + got_offset);
3922
3923 /* Fill in the entry in the .rela.plt section. */
3924 rela.r_offset = (gotplt->output_section->vma
3925 + gotplt->output_offset
3926 + got_offset);
3927 if (h->dynindx == -1
3928 || ((info->executable
3929 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3930 && h->def_regular
3931 && h->type == STT_GNU_IFUNC))
3932 {
3933 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3934 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
3935 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3936 rela.r_addend = (h->root.u.def.value
3937 + h->root.u.def.section->output_section->vma
3938 + h->root.u.def.section->output_offset);
3939 }
3940 else
3941 {
3942 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
3943 rela.r_addend = 0;
3944 }
3945
3946 bed = get_elf_backend_data (output_bfd);
3947 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
3948 htab->swap_reloca_out (output_bfd, &rela, loc);
3949
3950 if (!h->def_regular)
3951 {
3952 /* Mark the symbol as undefined, rather than as defined in
3953 the .plt section. Leave the value if there were any
3954 relocations where pointer equality matters (this is a clue
3955 for the dynamic linker, to make function pointer
3956 comparisons work between an application and shared
3957 library), otherwise set it to zero. If a function is only
3958 called from a binary, there is no need to slow down
3959 shared libraries because of that. */
3960 sym->st_shndx = SHN_UNDEF;
3961 if (!h->pointer_equality_needed)
3962 sym->st_value = 0;
3963 }
3964 }
3965
3966 if (h->got.offset != (bfd_vma) -1
3967 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
3968 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
3969 {
3970 Elf_Internal_Rela rela;
3971
3972 /* This symbol has an entry in the global offset table. Set it
3973 up. */
3974 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3975 abort ();
3976
3977 rela.r_offset = (htab->elf.sgot->output_section->vma
3978 + htab->elf.sgot->output_offset
3979 + (h->got.offset &~ (bfd_vma) 1));
3980
3981 /* If this is a static link, or it is a -Bsymbolic link and the
3982 symbol is defined locally or was forced to be local because
3983 of a version file, we just want to emit a RELATIVE reloc.
3984 The entry in the global offset table will already have been
3985 initialized in the relocate_section function. */
3986 if (h->def_regular
3987 && h->type == STT_GNU_IFUNC)
3988 {
3989 if (info->shared)
3990 {
3991 /* Generate R_X86_64_GLOB_DAT. */
3992 goto do_glob_dat;
3993 }
3994 else
3995 {
3996 asection *plt;
3997
3998 if (!h->pointer_equality_needed)
3999 abort ();
4000
4001 /* For non-shared object, we can't use .got.plt, which
4002 contains the real function addres if we need pointer
4003 equality. We load the GOT entry with the PLT entry. */
4004 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4005 bfd_put_64 (output_bfd, (plt->output_section->vma
4006 + plt->output_offset
4007 + h->plt.offset),
4008 htab->elf.sgot->contents + h->got.offset);
4009 return TRUE;
4010 }
4011 }
4012 else if (info->shared
4013 && SYMBOL_REFERENCES_LOCAL (info, h))
4014 {
4015 if (!h->def_regular)
4016 return FALSE;
4017 BFD_ASSERT((h->got.offset & 1) != 0);
4018 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4019 rela.r_addend = (h->root.u.def.value
4020 + h->root.u.def.section->output_section->vma
4021 + h->root.u.def.section->output_offset);
4022 }
4023 else
4024 {
4025 BFD_ASSERT((h->got.offset & 1) == 0);
4026 do_glob_dat:
4027 bfd_put_64 (output_bfd, (bfd_vma) 0,
4028 htab->elf.sgot->contents + h->got.offset);
4029 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
4030 rela.r_addend = 0;
4031 }
4032
4033 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
4034 }
4035
4036 if (h->needs_copy)
4037 {
4038 Elf_Internal_Rela rela;
4039
4040 /* This symbol needs a copy reloc. Set it up. */
4041
4042 if (h->dynindx == -1
4043 || (h->root.type != bfd_link_hash_defined
4044 && h->root.type != bfd_link_hash_defweak)
4045 || htab->srelbss == NULL)
4046 abort ();
4047
4048 rela.r_offset = (h->root.u.def.value
4049 + h->root.u.def.section->output_section->vma
4050 + h->root.u.def.section->output_offset);
4051 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
4052 rela.r_addend = 0;
4053 elf_append_rela (output_bfd, htab->srelbss, &rela);
4054 }
4055
4056 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4057 be NULL for local symbols. */
4058 if (sym != NULL
4059 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
4060 || h == htab->elf.hgot))
4061 sym->st_shndx = SHN_ABS;
4062
4063 return TRUE;
4064 }
4065
4066 /* Finish up local dynamic symbol handling. We set the contents of
4067 various dynamic sections here. */
4068
4069 static bfd_boolean
4070 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
4071 {
4072 struct elf_link_hash_entry *h
4073 = (struct elf_link_hash_entry *) *slot;
4074 struct bfd_link_info *info
4075 = (struct bfd_link_info *) inf;
4076
4077 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
4078 info, h, NULL);
4079 }
4080
4081 /* Used to decide how to sort relocs in an optimal manner for the
4082 dynamic linker, before writing them out. */
4083
4084 static enum elf_reloc_type_class
4085 elf_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
4086 {
4087 switch ((int) ELF32_R_TYPE (rela->r_info))
4088 {
4089 case R_X86_64_RELATIVE:
4090 return reloc_class_relative;
4091 case R_X86_64_JUMP_SLOT:
4092 return reloc_class_plt;
4093 case R_X86_64_COPY:
4094 return reloc_class_copy;
4095 default:
4096 return reloc_class_normal;
4097 }
4098 }
4099
4100 /* Finish up the dynamic sections. */
4101
4102 static bfd_boolean
4103 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
4104 struct bfd_link_info *info)
4105 {
4106 struct elf_x86_64_link_hash_table *htab;
4107 bfd *dynobj;
4108 asection *sdyn;
4109
4110 htab = elf_x86_64_hash_table (info);
4111 if (htab == NULL)
4112 return FALSE;
4113
4114 dynobj = htab->elf.dynobj;
4115 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4116
4117 if (htab->elf.dynamic_sections_created)
4118 {
4119 Elf64_External_Dyn *dyncon, *dynconend;
4120
4121 if (sdyn == NULL || htab->elf.sgot == NULL)
4122 abort ();
4123
4124 dyncon = (Elf64_External_Dyn *) sdyn->contents;
4125 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
4126 for (; dyncon < dynconend; dyncon++)
4127 {
4128 Elf_Internal_Dyn dyn;
4129 asection *s;
4130
4131 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
4132
4133 switch (dyn.d_tag)
4134 {
4135 default:
4136 continue;
4137
4138 case DT_PLTGOT:
4139 s = htab->elf.sgotplt;
4140 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4141 break;
4142
4143 case DT_JMPREL:
4144 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4145 break;
4146
4147 case DT_PLTRELSZ:
4148 s = htab->elf.srelplt->output_section;
4149 dyn.d_un.d_val = s->size;
4150 break;
4151
4152 case DT_RELASZ:
4153 /* The procedure linkage table relocs (DT_JMPREL) should
4154 not be included in the overall relocs (DT_RELA).
4155 Therefore, we override the DT_RELASZ entry here to
4156 make it not include the JMPREL relocs. Since the
4157 linker script arranges for .rela.plt to follow all
4158 other relocation sections, we don't have to worry
4159 about changing the DT_RELA entry. */
4160 if (htab->elf.srelplt != NULL)
4161 {
4162 s = htab->elf.srelplt->output_section;
4163 dyn.d_un.d_val -= s->size;
4164 }
4165 break;
4166
4167 case DT_TLSDESC_PLT:
4168 s = htab->elf.splt;
4169 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4170 + htab->tlsdesc_plt;
4171 break;
4172
4173 case DT_TLSDESC_GOT:
4174 s = htab->elf.sgot;
4175 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4176 + htab->tlsdesc_got;
4177 break;
4178 }
4179
4180 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
4181 }
4182
4183 /* Fill in the special first entry in the procedure linkage table. */
4184 if (htab->elf.splt && htab->elf.splt->size > 0)
4185 {
4186 /* Fill in the first entry in the procedure linkage table. */
4187 memcpy (htab->elf.splt->contents, elf_x86_64_plt0_entry,
4188 PLT_ENTRY_SIZE);
4189 /* Add offset for pushq GOT+8(%rip), since the instruction
4190 uses 6 bytes subtract this value. */
4191 bfd_put_32 (output_bfd,
4192 (htab->elf.sgotplt->output_section->vma
4193 + htab->elf.sgotplt->output_offset
4194 + 8
4195 - htab->elf.splt->output_section->vma
4196 - htab->elf.splt->output_offset
4197 - 6),
4198 htab->elf.splt->contents + 2);
4199 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4200 the end of the instruction. */
4201 bfd_put_32 (output_bfd,
4202 (htab->elf.sgotplt->output_section->vma
4203 + htab->elf.sgotplt->output_offset
4204 + 16
4205 - htab->elf.splt->output_section->vma
4206 - htab->elf.splt->output_offset
4207 - 12),
4208 htab->elf.splt->contents + 8);
4209
4210 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize =
4211 PLT_ENTRY_SIZE;
4212
4213 if (htab->tlsdesc_plt)
4214 {
4215 bfd_put_64 (output_bfd, (bfd_vma) 0,
4216 htab->elf.sgot->contents + htab->tlsdesc_got);
4217
4218 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4219 elf_x86_64_plt0_entry,
4220 PLT_ENTRY_SIZE);
4221
4222 /* Add offset for pushq GOT+8(%rip), since the
4223 instruction uses 6 bytes subtract this value. */
4224 bfd_put_32 (output_bfd,
4225 (htab->elf.sgotplt->output_section->vma
4226 + htab->elf.sgotplt->output_offset
4227 + 8
4228 - htab->elf.splt->output_section->vma
4229 - htab->elf.splt->output_offset
4230 - htab->tlsdesc_plt
4231 - 6),
4232 htab->elf.splt->contents + htab->tlsdesc_plt + 2);
4233 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4234 htab->tlsdesc_got. The 12 is the offset to the end of
4235 the instruction. */
4236 bfd_put_32 (output_bfd,
4237 (htab->elf.sgot->output_section->vma
4238 + htab->elf.sgot->output_offset
4239 + htab->tlsdesc_got
4240 - htab->elf.splt->output_section->vma
4241 - htab->elf.splt->output_offset
4242 - htab->tlsdesc_plt
4243 - 12),
4244 htab->elf.splt->contents + htab->tlsdesc_plt + 8);
4245 }
4246 }
4247 }
4248
4249 if (htab->elf.sgotplt)
4250 {
4251 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4252 {
4253 (*_bfd_error_handler)
4254 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4255 return FALSE;
4256 }
4257
4258 /* Fill in the first three entries in the global offset table. */
4259 if (htab->elf.sgotplt->size > 0)
4260 {
4261 /* Set the first entry in the global offset table to the address of
4262 the dynamic section. */
4263 if (sdyn == NULL)
4264 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4265 else
4266 bfd_put_64 (output_bfd,
4267 sdyn->output_section->vma + sdyn->output_offset,
4268 htab->elf.sgotplt->contents);
4269 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4270 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4271 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4272 }
4273
4274 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
4275 GOT_ENTRY_SIZE;
4276 }
4277
4278 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4279 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
4280 = GOT_ENTRY_SIZE;
4281
4282 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4283 htab_traverse (htab->loc_hash_table,
4284 elf_x86_64_finish_local_dynamic_symbol,
4285 info);
4286
4287 return TRUE;
4288 }
4289
4290 /* Return address for Ith PLT stub in section PLT, for relocation REL
4291 or (bfd_vma) -1 if it should not be included. */
4292
4293 static bfd_vma
4294 elf_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4295 const arelent *rel ATTRIBUTE_UNUSED)
4296 {
4297 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4298 }
4299
4300 /* Handle an x86-64 specific section when reading an object file. This
4301 is called when elfcode.h finds a section with an unknown type. */
4302
4303 static bfd_boolean
4304 elf_x86_64_section_from_shdr (bfd *abfd,
4305 Elf_Internal_Shdr *hdr,
4306 const char *name,
4307 int shindex)
4308 {
4309 if (hdr->sh_type != SHT_X86_64_UNWIND)
4310 return FALSE;
4311
4312 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4313 return FALSE;
4314
4315 return TRUE;
4316 }
4317
4318 /* Hook called by the linker routine which adds symbols from an object
4319 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4320 of .bss. */
4321
4322 static bfd_boolean
4323 elf_x86_64_add_symbol_hook (bfd *abfd,
4324 struct bfd_link_info *info,
4325 Elf_Internal_Sym *sym,
4326 const char **namep ATTRIBUTE_UNUSED,
4327 flagword *flagsp ATTRIBUTE_UNUSED,
4328 asection **secp,
4329 bfd_vma *valp)
4330 {
4331 asection *lcomm;
4332
4333 switch (sym->st_shndx)
4334 {
4335 case SHN_X86_64_LCOMMON:
4336 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4337 if (lcomm == NULL)
4338 {
4339 lcomm = bfd_make_section_with_flags (abfd,
4340 "LARGE_COMMON",
4341 (SEC_ALLOC
4342 | SEC_IS_COMMON
4343 | SEC_LINKER_CREATED));
4344 if (lcomm == NULL)
4345 return FALSE;
4346 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4347 }
4348 *secp = lcomm;
4349 *valp = sym->st_size;
4350 return TRUE;
4351 }
4352
4353 if ((abfd->flags & DYNAMIC) == 0
4354 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4355 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4356
4357 return TRUE;
4358 }
4359
4360
4361 /* Given a BFD section, try to locate the corresponding ELF section
4362 index. */
4363
4364 static bfd_boolean
4365 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4366 asection *sec, int *index_return)
4367 {
4368 if (sec == &_bfd_elf_large_com_section)
4369 {
4370 *index_return = SHN_X86_64_LCOMMON;
4371 return TRUE;
4372 }
4373 return FALSE;
4374 }
4375
4376 /* Process a symbol. */
4377
4378 static void
4379 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4380 asymbol *asym)
4381 {
4382 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4383
4384 switch (elfsym->internal_elf_sym.st_shndx)
4385 {
4386 case SHN_X86_64_LCOMMON:
4387 asym->section = &_bfd_elf_large_com_section;
4388 asym->value = elfsym->internal_elf_sym.st_size;
4389 /* Common symbol doesn't set BSF_GLOBAL. */
4390 asym->flags &= ~BSF_GLOBAL;
4391 break;
4392 }
4393 }
4394
4395 static bfd_boolean
4396 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
4397 {
4398 return (sym->st_shndx == SHN_COMMON
4399 || sym->st_shndx == SHN_X86_64_LCOMMON);
4400 }
4401
4402 static unsigned int
4403 elf_x86_64_common_section_index (asection *sec)
4404 {
4405 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4406 return SHN_COMMON;
4407 else
4408 return SHN_X86_64_LCOMMON;
4409 }
4410
4411 static asection *
4412 elf_x86_64_common_section (asection *sec)
4413 {
4414 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4415 return bfd_com_section_ptr;
4416 else
4417 return &_bfd_elf_large_com_section;
4418 }
4419
4420 static bfd_boolean
4421 elf_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
4422 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
4423 struct elf_link_hash_entry *h,
4424 Elf_Internal_Sym *sym,
4425 asection **psec,
4426 bfd_vma *pvalue ATTRIBUTE_UNUSED,
4427 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
4428 bfd_boolean *skip ATTRIBUTE_UNUSED,
4429 bfd_boolean *override ATTRIBUTE_UNUSED,
4430 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
4431 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
4432 bfd_boolean *newdef ATTRIBUTE_UNUSED,
4433 bfd_boolean *newdyn,
4434 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
4435 bfd_boolean *newweak ATTRIBUTE_UNUSED,
4436 bfd *abfd ATTRIBUTE_UNUSED,
4437 asection **sec,
4438 bfd_boolean *olddef ATTRIBUTE_UNUSED,
4439 bfd_boolean *olddyn,
4440 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
4441 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
4442 bfd *oldbfd,
4443 asection **oldsec)
4444 {
4445 /* A normal common symbol and a large common symbol result in a
4446 normal common symbol. We turn the large common symbol into a
4447 normal one. */
4448 if (!*olddyn
4449 && h->root.type == bfd_link_hash_common
4450 && !*newdyn
4451 && bfd_is_com_section (*sec)
4452 && *oldsec != *sec)
4453 {
4454 if (sym->st_shndx == SHN_COMMON
4455 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
4456 {
4457 h->root.u.c.p->section
4458 = bfd_make_section_old_way (oldbfd, "COMMON");
4459 h->root.u.c.p->section->flags = SEC_ALLOC;
4460 }
4461 else if (sym->st_shndx == SHN_X86_64_LCOMMON
4462 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
4463 *psec = *sec = bfd_com_section_ptr;
4464 }
4465
4466 return TRUE;
4467 }
4468
4469 static int
4470 elf_x86_64_additional_program_headers (bfd *abfd,
4471 struct bfd_link_info *info ATTRIBUTE_UNUSED)
4472 {
4473 asection *s;
4474 int count = 0;
4475
4476 /* Check to see if we need a large readonly segment. */
4477 s = bfd_get_section_by_name (abfd, ".lrodata");
4478 if (s && (s->flags & SEC_LOAD))
4479 count++;
4480
4481 /* Check to see if we need a large data segment. Since .lbss sections
4482 is placed right after the .bss section, there should be no need for
4483 a large data segment just because of .lbss. */
4484 s = bfd_get_section_by_name (abfd, ".ldata");
4485 if (s && (s->flags & SEC_LOAD))
4486 count++;
4487
4488 return count;
4489 }
4490
4491 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4492
4493 static bfd_boolean
4494 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
4495 {
4496 if (h->plt.offset != (bfd_vma) -1
4497 && !h->def_regular
4498 && !h->pointer_equality_needed)
4499 return FALSE;
4500
4501 return _bfd_elf_hash_symbol (h);
4502 }
4503
4504 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
4505
4506 static bfd_boolean
4507 elf_x86_64_relocs_compatible (const bfd_target *input,
4508 const bfd_target *output)
4509 {
4510 return ((xvec_get_elf_backend_data (input)->s->elfclass
4511 == xvec_get_elf_backend_data (output)->s->elfclass)
4512 && _bfd_elf_relocs_compatible (input, output));
4513 }
4514
4515 static const struct bfd_elf_special_section
4516 elf_x86_64_special_sections[]=
4517 {
4518 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4519 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4520 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
4521 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4522 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4523 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4524 { NULL, 0, 0, 0, 0 }
4525 };
4526
4527 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4528 #define TARGET_LITTLE_NAME "elf64-x86-64"
4529 #define ELF_ARCH bfd_arch_i386
4530 #define ELF_TARGET_ID X86_64_ELF_DATA
4531 #define ELF_MACHINE_CODE EM_X86_64
4532 #define ELF_MAXPAGESIZE 0x200000
4533 #define ELF_MINPAGESIZE 0x1000
4534 #define ELF_COMMONPAGESIZE 0x1000
4535
4536 #define elf_backend_can_gc_sections 1
4537 #define elf_backend_can_refcount 1
4538 #define elf_backend_want_got_plt 1
4539 #define elf_backend_plt_readonly 1
4540 #define elf_backend_want_plt_sym 0
4541 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4542 #define elf_backend_rela_normal 1
4543
4544 #define elf_info_to_howto elf_x86_64_info_to_howto
4545
4546 #define bfd_elf64_bfd_link_hash_table_create \
4547 elf_x86_64_link_hash_table_create
4548 #define bfd_elf64_bfd_link_hash_table_free \
4549 elf_x86_64_link_hash_table_free
4550 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
4551 #define bfd_elf64_bfd_reloc_name_lookup \
4552 elf_x86_64_reloc_name_lookup
4553
4554 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
4555 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
4556 #define elf_backend_check_relocs elf_x86_64_check_relocs
4557 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
4558 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
4559 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
4560 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
4561 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
4562 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
4563 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
4564 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
4565 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
4566 #define elf_backend_relocate_section elf_x86_64_relocate_section
4567 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
4568 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
4569 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4570 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
4571 #define elf_backend_object_p elf64_x86_64_elf_object_p
4572 #define bfd_elf64_mkobject elf_x86_64_mkobject
4573
4574 #define elf_backend_section_from_shdr \
4575 elf_x86_64_section_from_shdr
4576
4577 #define elf_backend_section_from_bfd_section \
4578 elf_x86_64_elf_section_from_bfd_section
4579 #define elf_backend_add_symbol_hook \
4580 elf_x86_64_add_symbol_hook
4581 #define elf_backend_symbol_processing \
4582 elf_x86_64_symbol_processing
4583 #define elf_backend_common_section_index \
4584 elf_x86_64_common_section_index
4585 #define elf_backend_common_section \
4586 elf_x86_64_common_section
4587 #define elf_backend_common_definition \
4588 elf_x86_64_common_definition
4589 #define elf_backend_merge_symbol \
4590 elf_x86_64_merge_symbol
4591 #define elf_backend_special_sections \
4592 elf_x86_64_special_sections
4593 #define elf_backend_additional_program_headers \
4594 elf_x86_64_additional_program_headers
4595 #define elf_backend_hash_symbol \
4596 elf_x86_64_hash_symbol
4597
4598 #undef elf_backend_post_process_headers
4599 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4600
4601 #include "elf64-target.h"
4602
4603 /* FreeBSD support. */
4604
4605 #undef TARGET_LITTLE_SYM
4606 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4607 #undef TARGET_LITTLE_NAME
4608 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4609
4610 #undef ELF_OSABI
4611 #define ELF_OSABI ELFOSABI_FREEBSD
4612
4613 #undef elf64_bed
4614 #define elf64_bed elf64_x86_64_fbsd_bed
4615
4616 #include "elf64-target.h"
4617
4618 /* Solaris 2 support. */
4619
4620 #undef TARGET_LITTLE_SYM
4621 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
4622 #undef TARGET_LITTLE_NAME
4623 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
4624
4625 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4626 objects won't be recognized. */
4627 #undef ELF_OSABI
4628
4629 #undef elf64_bed
4630 #define elf64_bed elf64_x86_64_sol2_bed
4631
4632 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
4633 boundary. */
4634 #undef elf_backend_static_tls_alignment
4635 #define elf_backend_static_tls_alignment 16
4636
4637 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4638
4639 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4640 File, p.63. */
4641 #undef elf_backend_want_plt_sym
4642 #define elf_backend_want_plt_sym 1
4643
4644 #include "elf64-target.h"
4645
4646 /* Intel L1OM support. */
4647
4648 static bfd_boolean
4649 elf64_l1om_elf_object_p (bfd *abfd)
4650 {
4651 /* Set the right machine number for an L1OM elf64 file. */
4652 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
4653 return TRUE;
4654 }
4655
4656 #undef TARGET_LITTLE_SYM
4657 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
4658 #undef TARGET_LITTLE_NAME
4659 #define TARGET_LITTLE_NAME "elf64-l1om"
4660 #undef ELF_ARCH
4661 #define ELF_ARCH bfd_arch_l1om
4662
4663 #undef ELF_MACHINE_CODE
4664 #define ELF_MACHINE_CODE EM_L1OM
4665
4666 #undef ELF_OSABI
4667
4668 #undef elf64_bed
4669 #define elf64_bed elf64_l1om_bed
4670
4671 #undef elf_backend_object_p
4672 #define elf_backend_object_p elf64_l1om_elf_object_p
4673
4674 #undef elf_backend_post_process_headers
4675 #undef elf_backend_static_tls_alignment
4676
4677 #include "elf64-target.h"
4678
4679 /* FreeBSD L1OM support. */
4680
4681 #undef TARGET_LITTLE_SYM
4682 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
4683 #undef TARGET_LITTLE_NAME
4684 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
4685
4686 #undef ELF_OSABI
4687 #define ELF_OSABI ELFOSABI_FREEBSD
4688
4689 #undef elf64_bed
4690 #define elf64_bed elf64_l1om_fbsd_bed
4691
4692 #undef elf_backend_post_process_headers
4693 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4694
4695 #include "elf64-target.h"
4696
4697 /* 32bit x86-64 support. */
4698
4699 static bfd_boolean
4700 elf32_x86_64_elf_object_p (bfd *abfd)
4701 {
4702 /* Set the right machine number for an x86-64 elf32 file. */
4703 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
4704 return TRUE;
4705 }
4706
4707 #undef TARGET_LITTLE_SYM
4708 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
4709 #undef TARGET_LITTLE_NAME
4710 #define TARGET_LITTLE_NAME "elf32-x86-64"
4711
4712 #undef ELF_ARCH
4713 #define ELF_ARCH bfd_arch_i386
4714
4715 #undef ELF_MACHINE_CODE
4716 #define ELF_MACHINE_CODE EM_X86_64
4717
4718 #define bfd_elf32_bfd_link_hash_table_create \
4719 elf_x86_64_link_hash_table_create
4720 #define bfd_elf32_bfd_link_hash_table_free \
4721 elf_x86_64_link_hash_table_free
4722 #define bfd_elf32_bfd_reloc_type_lookup \
4723 elf_x86_64_reloc_type_lookup
4724 #define bfd_elf32_bfd_reloc_name_lookup \
4725 elf_x86_64_reloc_name_lookup
4726 #define bfd_elf32_mkobject \
4727 elf_x86_64_mkobject
4728
4729 #undef ELF_OSABI
4730
4731 #undef elf_backend_post_process_headers
4732
4733 #undef elf_backend_object_p
4734 #define elf_backend_object_p \
4735 elf32_x86_64_elf_object_p
4736
4737 #undef elf_backend_bfd_from_remote_memory
4738 #define elf_backend_bfd_from_remote_memory \
4739 _bfd_elf32_bfd_from_remote_memory
4740
4741 #undef elf_backend_size_info
4742 #define elf_backend_size_info \
4743 _bfd_elf32_size_info
4744
4745 #include "elf32-target.h"
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