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2006-10-26 Ben Elliston <bje@au.ibm.com>
[binutils-gdb.git] / bfd / elf64-x86-64.c
blob2556fdce4f949a2e332e2fd4f0a2600d3ac8c878
1 /* X86-64 specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006
3 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 2 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, MA 02110-1301, USA. */
21
22 #include "bfd.h"
23 #include "sysdep.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27
28 #include "elf/x86-64.h"
29
30 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
31 #define MINUS_ONE (~ (bfd_vma) 0)
32
33 /* The relocation "howto" table. Order of fields:
34 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
35 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
36 static reloc_howto_type x86_64_elf_howto_table[] =
37 {
38 HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
39 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
40 FALSE),
41 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
42 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
43 FALSE),
44 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
45 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
46 TRUE),
47 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
48 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
49 FALSE),
50 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
51 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
52 TRUE),
53 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
55 FALSE),
56 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
58 MINUS_ONE, FALSE),
59 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
61 MINUS_ONE, FALSE),
62 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
64 MINUS_ONE, FALSE),
65 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
66 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
67 0xffffffff, TRUE),
68 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
69 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
70 FALSE),
71 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
72 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
73 FALSE),
74 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
75 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
76 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
78 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
80 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
81 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
82 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
84 MINUS_ONE, FALSE),
85 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
87 MINUS_ONE, FALSE),
88 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
90 MINUS_ONE, FALSE),
91 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
92 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
93 0xffffffff, TRUE),
94 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
95 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
96 0xffffffff, TRUE),
97 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
98 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
99 0xffffffff, FALSE),
100 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
101 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
102 0xffffffff, TRUE),
103 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
105 0xffffffff, FALSE),
106 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
107 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
108 TRUE),
109 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
110 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
111 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
112 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
113 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
114 FALSE, 0xffffffff, 0xffffffff, TRUE),
115 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
116 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
117 FALSE),
118 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
119 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
120 MINUS_ONE, TRUE),
121 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
122 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
123 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
124 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
125 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
126 MINUS_ONE, FALSE),
127 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
128 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
129 MINUS_ONE, FALSE),
130 EMPTY_HOWTO (32),
131 EMPTY_HOWTO (33),
132 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
133 complain_overflow_bitfield, bfd_elf_generic_reloc,
134 "R_X86_64_GOTPC32_TLSDESC",
135 FALSE, 0xffffffff, 0xffffffff, TRUE),
136 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
137 complain_overflow_dont, bfd_elf_generic_reloc,
138 "R_X86_64_TLSDESC_CALL",
139 FALSE, 0, 0, FALSE),
140 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
141 complain_overflow_bitfield, bfd_elf_generic_reloc,
142 "R_X86_64_TLSDESC",
143 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
144
145 /* We have a gap in the reloc numbers here.
146 R_X86_64_standard counts the number up to this point, and
147 R_X86_64_vt_offset is the value to subtract from a reloc type of
148 R_X86_64_GNU_VT* to form an index into this table. */
149 #define R_X86_64_standard (R_X86_64_TLSDESC + 1)
150 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
151
152 /* GNU extension to record C++ vtable hierarchy. */
153 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
154 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
155
156 /* GNU extension to record C++ vtable member usage. */
157 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
158 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
159 FALSE)
160 };
161
162 /* Map BFD relocs to the x86_64 elf relocs. */
163 struct elf_reloc_map
164 {
165 bfd_reloc_code_real_type bfd_reloc_val;
166 unsigned char elf_reloc_val;
167 };
168
169 static const struct elf_reloc_map x86_64_reloc_map[] =
170 {
171 { BFD_RELOC_NONE, R_X86_64_NONE, },
172 { BFD_RELOC_64, R_X86_64_64, },
173 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
174 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
175 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
176 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
177 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
178 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
179 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
180 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
181 { BFD_RELOC_32, R_X86_64_32, },
182 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
183 { BFD_RELOC_16, R_X86_64_16, },
184 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
185 { BFD_RELOC_8, R_X86_64_8, },
186 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
187 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
188 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
189 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
190 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
191 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
192 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
193 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
194 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
195 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
196 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
197 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
198 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
199 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
200 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
201 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
202 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
203 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
204 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
205 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
206 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
207 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
208 };
209
210 static reloc_howto_type *
211 elf64_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
212 {
213 unsigned i;
214
215 if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
216 || r_type >= (unsigned int) R_X86_64_max)
217 {
218 if (r_type >= (unsigned int) R_X86_64_standard)
219 {
220 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
221 abfd, (int) r_type);
222 r_type = R_X86_64_NONE;
223 }
224 i = r_type;
225 }
226 else
227 i = r_type - (unsigned int) R_X86_64_vt_offset;
228 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
229 return &x86_64_elf_howto_table[i];
230 }
231
232 /* Given a BFD reloc type, return a HOWTO structure. */
233 static reloc_howto_type *
234 elf64_x86_64_reloc_type_lookup (bfd *abfd,
235 bfd_reloc_code_real_type code)
236 {
237 unsigned int i;
238
239 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
240 i++)
241 {
242 if (x86_64_reloc_map[i].bfd_reloc_val == code)
243 return elf64_x86_64_rtype_to_howto (abfd,
244 x86_64_reloc_map[i].elf_reloc_val);
245 }
246 return 0;
247 }
248
249 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
250
251 static void
252 elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
253 Elf_Internal_Rela *dst)
254 {
255 unsigned r_type;
256
257 r_type = ELF64_R_TYPE (dst->r_info);
258 cache_ptr->howto = elf64_x86_64_rtype_to_howto (abfd, r_type);
259 BFD_ASSERT (r_type == cache_ptr->howto->type);
260 }
261 \f
262 /* Support for core dump NOTE sections. */
263 static bfd_boolean
264 elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
265 {
266 int offset;
267 size_t size;
268
269 switch (note->descsz)
270 {
271 default:
272 return FALSE;
273
274 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
275 /* pr_cursig */
276 elf_tdata (abfd)->core_signal
277 = bfd_get_16 (abfd, note->descdata + 12);
278
279 /* pr_pid */
280 elf_tdata (abfd)->core_pid
281 = bfd_get_32 (abfd, note->descdata + 32);
282
283 /* pr_reg */
284 offset = 112;
285 size = 216;
286
287 break;
288 }
289
290 /* Make a ".reg/999" section. */
291 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
292 size, note->descpos + offset);
293 }
294
295 static bfd_boolean
296 elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
297 {
298 switch (note->descsz)
299 {
300 default:
301 return FALSE;
302
303 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
304 elf_tdata (abfd)->core_program
305 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
306 elf_tdata (abfd)->core_command
307 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
308 }
309
310 /* Note that for some reason, a spurious space is tacked
311 onto the end of the args in some (at least one anyway)
312 implementations, so strip it off if it exists. */
313
314 {
315 char *command = elf_tdata (abfd)->core_command;
316 int n = strlen (command);
317
318 if (0 < n && command[n - 1] == ' ')
319 command[n - 1] = '\0';
320 }
321
322 return TRUE;
323 }
324 \f
325 /* Functions for the x86-64 ELF linker. */
326
327 /* The name of the dynamic interpreter. This is put in the .interp
328 section. */
329
330 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
331
332 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
333 copying dynamic variables from a shared lib into an app's dynbss
334 section, and instead use a dynamic relocation to point into the
335 shared lib. */
336 #define ELIMINATE_COPY_RELOCS 1
337
338 /* The size in bytes of an entry in the global offset table. */
339
340 #define GOT_ENTRY_SIZE 8
341
342 /* The size in bytes of an entry in the procedure linkage table. */
343
344 #define PLT_ENTRY_SIZE 16
345
346 /* The first entry in a procedure linkage table looks like this. See the
347 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
348
349 static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
350 {
351 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
352 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
353 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
354 };
355
356 /* Subsequent entries in a procedure linkage table look like this. */
357
358 static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
359 {
360 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
361 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
362 0x68, /* pushq immediate */
363 0, 0, 0, 0, /* replaced with index into relocation table. */
364 0xe9, /* jmp relative */
365 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
366 };
367
368 /* The x86-64 linker needs to keep track of the number of relocs that
369 it decides to copy as dynamic relocs in check_relocs for each symbol.
370 This is so that it can later discard them if they are found to be
371 unnecessary. We store the information in a field extending the
372 regular ELF linker hash table. */
373
374 struct elf64_x86_64_dyn_relocs
375 {
376 /* Next section. */
377 struct elf64_x86_64_dyn_relocs *next;
378
379 /* The input section of the reloc. */
380 asection *sec;
381
382 /* Total number of relocs copied for the input section. */
383 bfd_size_type count;
384
385 /* Number of pc-relative relocs copied for the input section. */
386 bfd_size_type pc_count;
387 };
388
389 /* x86-64 ELF linker hash entry. */
390
391 struct elf64_x86_64_link_hash_entry
392 {
393 struct elf_link_hash_entry elf;
394
395 /* Track dynamic relocs copied for this symbol. */
396 struct elf64_x86_64_dyn_relocs *dyn_relocs;
397
398 #define GOT_UNKNOWN 0
399 #define GOT_NORMAL 1
400 #define GOT_TLS_GD 2
401 #define GOT_TLS_IE 3
402 #define GOT_TLS_GDESC 4
403 #define GOT_TLS_GD_BOTH_P(type) \
404 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
405 #define GOT_TLS_GD_P(type) \
406 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
407 #define GOT_TLS_GDESC_P(type) \
408 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
409 #define GOT_TLS_GD_ANY_P(type) \
410 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
411 unsigned char tls_type;
412
413 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
414 starting at the end of the jump table. */
415 bfd_vma tlsdesc_got;
416 };
417
418 #define elf64_x86_64_hash_entry(ent) \
419 ((struct elf64_x86_64_link_hash_entry *)(ent))
420
421 struct elf64_x86_64_obj_tdata
422 {
423 struct elf_obj_tdata root;
424
425 /* tls_type for each local got entry. */
426 char *local_got_tls_type;
427
428 /* GOTPLT entries for TLS descriptors. */
429 bfd_vma *local_tlsdesc_gotent;
430 };
431
432 #define elf64_x86_64_tdata(abfd) \
433 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
434
435 #define elf64_x86_64_local_got_tls_type(abfd) \
436 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
437
438 #define elf64_x86_64_local_tlsdesc_gotent(abfd) \
439 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
440
441 /* x86-64 ELF linker hash table. */
442
443 struct elf64_x86_64_link_hash_table
444 {
445 struct elf_link_hash_table elf;
446
447 /* Short-cuts to get to dynamic linker sections. */
448 asection *sgot;
449 asection *sgotplt;
450 asection *srelgot;
451 asection *splt;
452 asection *srelplt;
453 asection *sdynbss;
454 asection *srelbss;
455
456 /* The offset into splt of the PLT entry for the TLS descriptor
457 resolver. Special values are 0, if not necessary (or not found
458 to be necessary yet), and -1 if needed but not determined
459 yet. */
460 bfd_vma tlsdesc_plt;
461 /* The offset into sgot of the GOT entry used by the PLT entry
462 above. */
463 bfd_vma tlsdesc_got;
464
465 union {
466 bfd_signed_vma refcount;
467 bfd_vma offset;
468 } tls_ld_got;
469
470 /* The amount of space used by the jump slots in the GOT. */
471 bfd_vma sgotplt_jump_table_size;
472
473 /* Small local sym to section mapping cache. */
474 struct sym_sec_cache sym_sec;
475 };
476
477 /* Get the x86-64 ELF linker hash table from a link_info structure. */
478
479 #define elf64_x86_64_hash_table(p) \
480 ((struct elf64_x86_64_link_hash_table *) ((p)->hash))
481
482 #define elf64_x86_64_compute_jump_table_size(htab) \
483 ((htab)->srelplt->reloc_count * GOT_ENTRY_SIZE)
484
485 /* Create an entry in an x86-64 ELF linker hash table. */
486
487 static struct bfd_hash_entry *
488 link_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table,
489 const char *string)
490 {
491 /* Allocate the structure if it has not already been allocated by a
492 subclass. */
493 if (entry == NULL)
494 {
495 entry = bfd_hash_allocate (table,
496 sizeof (struct elf64_x86_64_link_hash_entry));
497 if (entry == NULL)
498 return entry;
499 }
500
501 /* Call the allocation method of the superclass. */
502 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
503 if (entry != NULL)
504 {
505 struct elf64_x86_64_link_hash_entry *eh;
506
507 eh = (struct elf64_x86_64_link_hash_entry *) entry;
508 eh->dyn_relocs = NULL;
509 eh->tls_type = GOT_UNKNOWN;
510 eh->tlsdesc_got = (bfd_vma) -1;
511 }
512
513 return entry;
514 }
515
516 /* Create an X86-64 ELF linker hash table. */
517
518 static struct bfd_link_hash_table *
519 elf64_x86_64_link_hash_table_create (bfd *abfd)
520 {
521 struct elf64_x86_64_link_hash_table *ret;
522 bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table);
523
524 ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt);
525 if (ret == NULL)
526 return NULL;
527
528 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
529 sizeof (struct elf64_x86_64_link_hash_entry)))
530 {
531 free (ret);
532 return NULL;
533 }
534
535 ret->sgot = NULL;
536 ret->sgotplt = NULL;
537 ret->srelgot = NULL;
538 ret->splt = NULL;
539 ret->srelplt = NULL;
540 ret->sdynbss = NULL;
541 ret->srelbss = NULL;
542 ret->sym_sec.abfd = NULL;
543 ret->tlsdesc_plt = 0;
544 ret->tlsdesc_got = 0;
545 ret->tls_ld_got.refcount = 0;
546 ret->sgotplt_jump_table_size = 0;
547
548 return &ret->elf.root;
549 }
550
551 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
552 shortcuts to them in our hash table. */
553
554 static bfd_boolean
555 create_got_section (bfd *dynobj, struct bfd_link_info *info)
556 {
557 struct elf64_x86_64_link_hash_table *htab;
558
559 if (! _bfd_elf_create_got_section (dynobj, info))
560 return FALSE;
561
562 htab = elf64_x86_64_hash_table (info);
563 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
564 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
565 if (!htab->sgot || !htab->sgotplt)
566 abort ();
567
568 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rela.got",
569 (SEC_ALLOC | SEC_LOAD
570 | SEC_HAS_CONTENTS
571 | SEC_IN_MEMORY
572 | SEC_LINKER_CREATED
573 | SEC_READONLY));
574 if (htab->srelgot == NULL
575 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
576 return FALSE;
577 return TRUE;
578 }
579
580 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
581 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
582 hash table. */
583
584 static bfd_boolean
585 elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
586 {
587 struct elf64_x86_64_link_hash_table *htab;
588
589 htab = elf64_x86_64_hash_table (info);
590 if (!htab->sgot && !create_got_section (dynobj, info))
591 return FALSE;
592
593 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
594 return FALSE;
595
596 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
597 htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
598 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
599 if (!info->shared)
600 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
601
602 if (!htab->splt || !htab->srelplt || !htab->sdynbss
603 || (!info->shared && !htab->srelbss))
604 abort ();
605
606 return TRUE;
607 }
608
609 /* Copy the extra info we tack onto an elf_link_hash_entry. */
610
611 static void
612 elf64_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
613 struct elf_link_hash_entry *dir,
614 struct elf_link_hash_entry *ind)
615 {
616 struct elf64_x86_64_link_hash_entry *edir, *eind;
617
618 edir = (struct elf64_x86_64_link_hash_entry *) dir;
619 eind = (struct elf64_x86_64_link_hash_entry *) ind;
620
621 if (eind->dyn_relocs != NULL)
622 {
623 if (edir->dyn_relocs != NULL)
624 {
625 struct elf64_x86_64_dyn_relocs **pp;
626 struct elf64_x86_64_dyn_relocs *p;
627
628 /* Add reloc counts against the indirect sym to the direct sym
629 list. Merge any entries against the same section. */
630 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
631 {
632 struct elf64_x86_64_dyn_relocs *q;
633
634 for (q = edir->dyn_relocs; q != NULL; q = q->next)
635 if (q->sec == p->sec)
636 {
637 q->pc_count += p->pc_count;
638 q->count += p->count;
639 *pp = p->next;
640 break;
641 }
642 if (q == NULL)
643 pp = &p->next;
644 }
645 *pp = edir->dyn_relocs;
646 }
647
648 edir->dyn_relocs = eind->dyn_relocs;
649 eind->dyn_relocs = NULL;
650 }
651
652 if (ind->root.type == bfd_link_hash_indirect
653 && dir->got.refcount <= 0)
654 {
655 edir->tls_type = eind->tls_type;
656 eind->tls_type = GOT_UNKNOWN;
657 }
658
659 if (ELIMINATE_COPY_RELOCS
660 && ind->root.type != bfd_link_hash_indirect
661 && dir->dynamic_adjusted)
662 {
663 /* If called to transfer flags for a weakdef during processing
664 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
665 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
666 dir->ref_dynamic |= ind->ref_dynamic;
667 dir->ref_regular |= ind->ref_regular;
668 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
669 dir->needs_plt |= ind->needs_plt;
670 dir->pointer_equality_needed |= ind->pointer_equality_needed;
671 }
672 else
673 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
674 }
675
676 static bfd_boolean
677 elf64_x86_64_mkobject (bfd *abfd)
678 {
679 if (abfd->tdata.any == NULL)
680 {
681 bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata);
682 abfd->tdata.any = bfd_zalloc (abfd, amt);
683 if (abfd->tdata.any == NULL)
684 return FALSE;
685 }
686 return bfd_elf_mkobject (abfd);
687 }
688
689 static bfd_boolean
690 elf64_x86_64_elf_object_p (bfd *abfd)
691 {
692 /* Set the right machine number for an x86-64 elf64 file. */
693 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
694 return TRUE;
695 }
696
697 static int
698 elf64_x86_64_tls_transition (struct bfd_link_info *info, int r_type, int is_local)
699 {
700 if (info->shared)
701 return r_type;
702
703 switch (r_type)
704 {
705 case R_X86_64_TLSGD:
706 case R_X86_64_GOTPC32_TLSDESC:
707 case R_X86_64_TLSDESC_CALL:
708 case R_X86_64_GOTTPOFF:
709 if (is_local)
710 return R_X86_64_TPOFF32;
711 return R_X86_64_GOTTPOFF;
712 case R_X86_64_TLSLD:
713 return R_X86_64_TPOFF32;
714 }
715
716 return r_type;
717 }
718
719 /* Look through the relocs for a section during the first phase, and
720 calculate needed space in the global offset table, procedure
721 linkage table, and dynamic reloc sections. */
722
723 static bfd_boolean
724 elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec,
725 const Elf_Internal_Rela *relocs)
726 {
727 struct elf64_x86_64_link_hash_table *htab;
728 Elf_Internal_Shdr *symtab_hdr;
729 struct elf_link_hash_entry **sym_hashes;
730 const Elf_Internal_Rela *rel;
731 const Elf_Internal_Rela *rel_end;
732 asection *sreloc;
733
734 if (info->relocatable)
735 return TRUE;
736
737 htab = elf64_x86_64_hash_table (info);
738 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
739 sym_hashes = elf_sym_hashes (abfd);
740
741 sreloc = NULL;
742
743 rel_end = relocs + sec->reloc_count;
744 for (rel = relocs; rel < rel_end; rel++)
745 {
746 unsigned int r_type;
747 unsigned long r_symndx;
748 struct elf_link_hash_entry *h;
749
750 r_symndx = ELF64_R_SYM (rel->r_info);
751 r_type = ELF64_R_TYPE (rel->r_info);
752
753 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
754 {
755 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
756 abfd, r_symndx);
757 return FALSE;
758 }
759
760 if (r_symndx < symtab_hdr->sh_info)
761 h = NULL;
762 else
763 {
764 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
765 while (h->root.type == bfd_link_hash_indirect
766 || h->root.type == bfd_link_hash_warning)
767 h = (struct elf_link_hash_entry *) h->root.u.i.link;
768 }
769
770 r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL);
771 switch (r_type)
772 {
773 case R_X86_64_TLSLD:
774 htab->tls_ld_got.refcount += 1;
775 goto create_got;
776
777 case R_X86_64_TPOFF32:
778 if (info->shared)
779 {
780 (*_bfd_error_handler)
781 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
782 abfd,
783 x86_64_elf_howto_table[r_type].name,
784 (h) ? h->root.root.string : "a local symbol");
785 bfd_set_error (bfd_error_bad_value);
786 return FALSE;
787 }
788 break;
789
790 case R_X86_64_GOTTPOFF:
791 if (info->shared)
792 info->flags |= DF_STATIC_TLS;
793 /* Fall through */
794
795 case R_X86_64_GOT32:
796 case R_X86_64_GOTPCREL:
797 case R_X86_64_TLSGD:
798 case R_X86_64_GOT64:
799 case R_X86_64_GOTPCREL64:
800 case R_X86_64_GOTPLT64:
801 case R_X86_64_GOTPC32_TLSDESC:
802 case R_X86_64_TLSDESC_CALL:
803 /* This symbol requires a global offset table entry. */
804 {
805 int tls_type, old_tls_type;
806
807 switch (r_type)
808 {
809 default: tls_type = GOT_NORMAL; break;
810 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
811 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
812 case R_X86_64_GOTPC32_TLSDESC:
813 case R_X86_64_TLSDESC_CALL:
814 tls_type = GOT_TLS_GDESC; break;
815 }
816
817 if (h != NULL)
818 {
819 if (r_type == R_X86_64_GOTPLT64)
820 {
821 /* This relocation indicates that we also need
822 a PLT entry, as this is a function. We don't need
823 a PLT entry for local symbols. */
824 h->needs_plt = 1;
825 h->plt.refcount += 1;
826 }
827 h->got.refcount += 1;
828 old_tls_type = elf64_x86_64_hash_entry (h)->tls_type;
829 }
830 else
831 {
832 bfd_signed_vma *local_got_refcounts;
833
834 /* This is a global offset table entry for a local symbol. */
835 local_got_refcounts = elf_local_got_refcounts (abfd);
836 if (local_got_refcounts == NULL)
837 {
838 bfd_size_type size;
839
840 size = symtab_hdr->sh_info;
841 size *= sizeof (bfd_signed_vma)
842 + sizeof (bfd_vma) + sizeof (char);
843 local_got_refcounts = ((bfd_signed_vma *)
844 bfd_zalloc (abfd, size));
845 if (local_got_refcounts == NULL)
846 return FALSE;
847 elf_local_got_refcounts (abfd) = local_got_refcounts;
848 elf64_x86_64_local_tlsdesc_gotent (abfd)
849 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
850 elf64_x86_64_local_got_tls_type (abfd)
851 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
852 }
853 local_got_refcounts[r_symndx] += 1;
854 old_tls_type
855 = elf64_x86_64_local_got_tls_type (abfd) [r_symndx];
856 }
857
858 /* If a TLS symbol is accessed using IE at least once,
859 there is no point to use dynamic model for it. */
860 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
861 && (! GOT_TLS_GD_ANY_P (old_tls_type)
862 || tls_type != GOT_TLS_IE))
863 {
864 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
865 tls_type = old_tls_type;
866 else if (GOT_TLS_GD_ANY_P (old_tls_type)
867 && GOT_TLS_GD_ANY_P (tls_type))
868 tls_type |= old_tls_type;
869 else
870 {
871 (*_bfd_error_handler)
872 (_("%B: %s' accessed both as normal and thread local symbol"),
873 abfd, h ? h->root.root.string : "<local>");
874 return FALSE;
875 }
876 }
877
878 if (old_tls_type != tls_type)
879 {
880 if (h != NULL)
881 elf64_x86_64_hash_entry (h)->tls_type = tls_type;
882 else
883 elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
884 }
885 }
886 /* Fall through */
887
888 case R_X86_64_GOTOFF64:
889 case R_X86_64_GOTPC32:
890 case R_X86_64_GOTPC64:
891 create_got:
892 if (htab->sgot == NULL)
893 {
894 if (htab->elf.dynobj == NULL)
895 htab->elf.dynobj = abfd;
896 if (!create_got_section (htab->elf.dynobj, info))
897 return FALSE;
898 }
899 break;
900
901 case R_X86_64_PLT32:
902 /* This symbol requires a procedure linkage table entry. We
903 actually build the entry in adjust_dynamic_symbol,
904 because this might be a case of linking PIC code which is
905 never referenced by a dynamic object, in which case we
906 don't need to generate a procedure linkage table entry
907 after all. */
908
909 /* If this is a local symbol, we resolve it directly without
910 creating a procedure linkage table entry. */
911 if (h == NULL)
912 continue;
913
914 h->needs_plt = 1;
915 h->plt.refcount += 1;
916 break;
917
918 case R_X86_64_PLTOFF64:
919 /* This tries to form the 'address' of a function relative
920 to GOT. For global symbols we need a PLT entry. */
921 if (h != NULL)
922 {
923 h->needs_plt = 1;
924 h->plt.refcount += 1;
925 }
926 goto create_got;
927
928 case R_X86_64_8:
929 case R_X86_64_16:
930 case R_X86_64_32:
931 case R_X86_64_32S:
932 /* Let's help debug shared library creation. These relocs
933 cannot be used in shared libs. Don't error out for
934 sections we don't care about, such as debug sections or
935 non-constant sections. */
936 if (info->shared
937 && (sec->flags & SEC_ALLOC) != 0
938 && (sec->flags & SEC_READONLY) != 0)
939 {
940 (*_bfd_error_handler)
941 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
942 abfd,
943 x86_64_elf_howto_table[r_type].name,
944 (h) ? h->root.root.string : "a local symbol");
945 bfd_set_error (bfd_error_bad_value);
946 return FALSE;
947 }
948 /* Fall through. */
949
950 case R_X86_64_PC8:
951 case R_X86_64_PC16:
952 case R_X86_64_PC32:
953 case R_X86_64_PC64:
954 case R_X86_64_64:
955 if (h != NULL && !info->shared)
956 {
957 /* If this reloc is in a read-only section, we might
958 need a copy reloc. We can't check reliably at this
959 stage whether the section is read-only, as input
960 sections have not yet been mapped to output sections.
961 Tentatively set the flag for now, and correct in
962 adjust_dynamic_symbol. */
963 h->non_got_ref = 1;
964
965 /* We may need a .plt entry if the function this reloc
966 refers to is in a shared lib. */
967 h->plt.refcount += 1;
968 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
969 h->pointer_equality_needed = 1;
970 }
971
972 /* If we are creating a shared library, and this is a reloc
973 against a global symbol, or a non PC relative reloc
974 against a local symbol, then we need to copy the reloc
975 into the shared library. However, if we are linking with
976 -Bsymbolic, we do not need to copy a reloc against a
977 global symbol which is defined in an object we are
978 including in the link (i.e., DEF_REGULAR is set). At
979 this point we have not seen all the input files, so it is
980 possible that DEF_REGULAR is not set now but will be set
981 later (it is never cleared). In case of a weak definition,
982 DEF_REGULAR may be cleared later by a strong definition in
983 a shared library. We account for that possibility below by
984 storing information in the relocs_copied field of the hash
985 table entry. A similar situation occurs when creating
986 shared libraries and symbol visibility changes render the
987 symbol local.
988
989 If on the other hand, we are creating an executable, we
990 may need to keep relocations for symbols satisfied by a
991 dynamic library if we manage to avoid copy relocs for the
992 symbol. */
993 if ((info->shared
994 && (sec->flags & SEC_ALLOC) != 0
995 && (((r_type != R_X86_64_PC8)
996 && (r_type != R_X86_64_PC16)
997 && (r_type != R_X86_64_PC32)
998 && (r_type != R_X86_64_PC64))
999 || (h != NULL
1000 && (! SYMBOLIC_BIND (info, h)
1001 || h->root.type == bfd_link_hash_defweak
1002 || !h->def_regular))))
1003 || (ELIMINATE_COPY_RELOCS
1004 && !info->shared
1005 && (sec->flags & SEC_ALLOC) != 0
1006 && h != NULL
1007 && (h->root.type == bfd_link_hash_defweak
1008 || !h->def_regular)))
1009 {
1010 struct elf64_x86_64_dyn_relocs *p;
1011 struct elf64_x86_64_dyn_relocs **head;
1012
1013 /* We must copy these reloc types into the output file.
1014 Create a reloc section in dynobj and make room for
1015 this reloc. */
1016 if (sreloc == NULL)
1017 {
1018 const char *name;
1019 bfd *dynobj;
1020
1021 name = (bfd_elf_string_from_elf_section
1022 (abfd,
1023 elf_elfheader (abfd)->e_shstrndx,
1024 elf_section_data (sec)->rel_hdr.sh_name));
1025 if (name == NULL)
1026 return FALSE;
1027
1028 if (! CONST_STRNEQ (name, ".rela")
1029 || strcmp (bfd_get_section_name (abfd, sec),
1030 name + 5) != 0)
1031 {
1032 (*_bfd_error_handler)
1033 (_("%B: bad relocation section name `%s\'"),
1034 abfd, name);
1035 }
1036
1037 if (htab->elf.dynobj == NULL)
1038 htab->elf.dynobj = abfd;
1039
1040 dynobj = htab->elf.dynobj;
1041
1042 sreloc = bfd_get_section_by_name (dynobj, name);
1043 if (sreloc == NULL)
1044 {
1045 flagword flags;
1046
1047 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1048 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1049 if ((sec->flags & SEC_ALLOC) != 0)
1050 flags |= SEC_ALLOC | SEC_LOAD;
1051 sreloc = bfd_make_section_with_flags (dynobj,
1052 name,
1053 flags);
1054 if (sreloc == NULL
1055 || ! bfd_set_section_alignment (dynobj, sreloc, 3))
1056 return FALSE;
1057 }
1058 elf_section_data (sec)->sreloc = sreloc;
1059 }
1060
1061 /* If this is a global symbol, we count the number of
1062 relocations we need for this symbol. */
1063 if (h != NULL)
1064 {
1065 head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs;
1066 }
1067 else
1068 {
1069 void **vpp;
1070 /* Track dynamic relocs needed for local syms too.
1071 We really need local syms available to do this
1072 easily. Oh well. */
1073
1074 asection *s;
1075 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1076 sec, r_symndx);
1077 if (s == NULL)
1078 return FALSE;
1079
1080 /* Beware of type punned pointers vs strict aliasing
1081 rules. */
1082 vpp = &(elf_section_data (s)->local_dynrel);
1083 head = (struct elf64_x86_64_dyn_relocs **)vpp;
1084 }
1085
1086 p = *head;
1087 if (p == NULL || p->sec != sec)
1088 {
1089 bfd_size_type amt = sizeof *p;
1090 p = ((struct elf64_x86_64_dyn_relocs *)
1091 bfd_alloc (htab->elf.dynobj, amt));
1092 if (p == NULL)
1093 return FALSE;
1094 p->next = *head;
1095 *head = p;
1096 p->sec = sec;
1097 p->count = 0;
1098 p->pc_count = 0;
1099 }
1100
1101 p->count += 1;
1102 if (r_type == R_X86_64_PC8
1103 || r_type == R_X86_64_PC16
1104 || r_type == R_X86_64_PC32
1105 || r_type == R_X86_64_PC64)
1106 p->pc_count += 1;
1107 }
1108 break;
1109
1110 /* This relocation describes the C++ object vtable hierarchy.
1111 Reconstruct it for later use during GC. */
1112 case R_X86_64_GNU_VTINHERIT:
1113 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1114 return FALSE;
1115 break;
1116
1117 /* This relocation describes which C++ vtable entries are actually
1118 used. Record for later use during GC. */
1119 case R_X86_64_GNU_VTENTRY:
1120 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1121 return FALSE;
1122 break;
1123
1124 default:
1125 break;
1126 }
1127 }
1128
1129 return TRUE;
1130 }
1131
1132 /* Return the section that should be marked against GC for a given
1133 relocation. */
1134
1135 static asection *
1136 elf64_x86_64_gc_mark_hook (asection *sec,
1137 struct bfd_link_info *info,
1138 Elf_Internal_Rela *rel,
1139 struct elf_link_hash_entry *h,
1140 Elf_Internal_Sym *sym)
1141 {
1142 if (h != NULL)
1143 switch (ELF64_R_TYPE (rel->r_info))
1144 {
1145 case R_X86_64_GNU_VTINHERIT:
1146 case R_X86_64_GNU_VTENTRY:
1147 return NULL;
1148 }
1149
1150 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1151 }
1152
1153 /* Update the got entry reference counts for the section being removed. */
1154
1155 static bfd_boolean
1156 elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1157 asection *sec, const Elf_Internal_Rela *relocs)
1158 {
1159 Elf_Internal_Shdr *symtab_hdr;
1160 struct elf_link_hash_entry **sym_hashes;
1161 bfd_signed_vma *local_got_refcounts;
1162 const Elf_Internal_Rela *rel, *relend;
1163
1164 elf_section_data (sec)->local_dynrel = NULL;
1165
1166 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1167 sym_hashes = elf_sym_hashes (abfd);
1168 local_got_refcounts = elf_local_got_refcounts (abfd);
1169
1170 relend = relocs + sec->reloc_count;
1171 for (rel = relocs; rel < relend; rel++)
1172 {
1173 unsigned long r_symndx;
1174 unsigned int r_type;
1175 struct elf_link_hash_entry *h = NULL;
1176
1177 r_symndx = ELF64_R_SYM (rel->r_info);
1178 if (r_symndx >= symtab_hdr->sh_info)
1179 {
1180 struct elf64_x86_64_link_hash_entry *eh;
1181 struct elf64_x86_64_dyn_relocs **pp;
1182 struct elf64_x86_64_dyn_relocs *p;
1183
1184 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1185 while (h->root.type == bfd_link_hash_indirect
1186 || h->root.type == bfd_link_hash_warning)
1187 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1188 eh = (struct elf64_x86_64_link_hash_entry *) h;
1189
1190 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1191 if (p->sec == sec)
1192 {
1193 /* Everything must go for SEC. */
1194 *pp = p->next;
1195 break;
1196 }
1197 }
1198
1199 r_type = ELF64_R_TYPE (rel->r_info);
1200 r_type = elf64_x86_64_tls_transition (info, r_type, h != NULL);
1201 switch (r_type)
1202 {
1203 case R_X86_64_TLSLD:
1204 if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0)
1205 elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1;
1206 break;
1207
1208 case R_X86_64_TLSGD:
1209 case R_X86_64_GOTPC32_TLSDESC:
1210 case R_X86_64_TLSDESC_CALL:
1211 case R_X86_64_GOTTPOFF:
1212 case R_X86_64_GOT32:
1213 case R_X86_64_GOTPCREL:
1214 case R_X86_64_GOT64:
1215 case R_X86_64_GOTPCREL64:
1216 case R_X86_64_GOTPLT64:
1217 if (h != NULL)
1218 {
1219 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
1220 h->plt.refcount -= 1;
1221 if (h->got.refcount > 0)
1222 h->got.refcount -= 1;
1223 }
1224 else if (local_got_refcounts != NULL)
1225 {
1226 if (local_got_refcounts[r_symndx] > 0)
1227 local_got_refcounts[r_symndx] -= 1;
1228 }
1229 break;
1230
1231 case R_X86_64_8:
1232 case R_X86_64_16:
1233 case R_X86_64_32:
1234 case R_X86_64_64:
1235 case R_X86_64_32S:
1236 case R_X86_64_PC8:
1237 case R_X86_64_PC16:
1238 case R_X86_64_PC32:
1239 case R_X86_64_PC64:
1240 if (info->shared)
1241 break;
1242 /* Fall thru */
1243
1244 case R_X86_64_PLT32:
1245 case R_X86_64_PLTOFF64:
1246 if (h != NULL)
1247 {
1248 if (h->plt.refcount > 0)
1249 h->plt.refcount -= 1;
1250 }
1251 break;
1252
1253 default:
1254 break;
1255 }
1256 }
1257
1258 return TRUE;
1259 }
1260
1261 /* Adjust a symbol defined by a dynamic object and referenced by a
1262 regular object. The current definition is in some section of the
1263 dynamic object, but we're not including those sections. We have to
1264 change the definition to something the rest of the link can
1265 understand. */
1266
1267 static bfd_boolean
1268 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
1269 struct elf_link_hash_entry *h)
1270 {
1271 struct elf64_x86_64_link_hash_table *htab;
1272 asection *s;
1273 unsigned int power_of_two;
1274
1275 /* If this is a function, put it in the procedure linkage table. We
1276 will fill in the contents of the procedure linkage table later,
1277 when we know the address of the .got section. */
1278 if (h->type == STT_FUNC
1279 || h->needs_plt)
1280 {
1281 if (h->plt.refcount <= 0
1282 || SYMBOL_CALLS_LOCAL (info, h)
1283 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1284 && h->root.type == bfd_link_hash_undefweak))
1285 {
1286 /* This case can occur if we saw a PLT32 reloc in an input
1287 file, but the symbol was never referred to by a dynamic
1288 object, or if all references were garbage collected. In
1289 such a case, we don't actually need to build a procedure
1290 linkage table, and we can just do a PC32 reloc instead. */
1291 h->plt.offset = (bfd_vma) -1;
1292 h->needs_plt = 0;
1293 }
1294
1295 return TRUE;
1296 }
1297 else
1298 /* It's possible that we incorrectly decided a .plt reloc was
1299 needed for an R_X86_64_PC32 reloc to a non-function sym in
1300 check_relocs. We can't decide accurately between function and
1301 non-function syms in check-relocs; Objects loaded later in
1302 the link may change h->type. So fix it now. */
1303 h->plt.offset = (bfd_vma) -1;
1304
1305 /* If this is a weak symbol, and there is a real definition, the
1306 processor independent code will have arranged for us to see the
1307 real definition first, and we can just use the same value. */
1308 if (h->u.weakdef != NULL)
1309 {
1310 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1311 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1312 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1313 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1314 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1315 h->non_got_ref = h->u.weakdef->non_got_ref;
1316 return TRUE;
1317 }
1318
1319 /* This is a reference to a symbol defined by a dynamic object which
1320 is not a function. */
1321
1322 /* If we are creating a shared library, we must presume that the
1323 only references to the symbol are via the global offset table.
1324 For such cases we need not do anything here; the relocations will
1325 be handled correctly by relocate_section. */
1326 if (info->shared)
1327 return TRUE;
1328
1329 /* If there are no references to this symbol that do not use the
1330 GOT, we don't need to generate a copy reloc. */
1331 if (!h->non_got_ref)
1332 return TRUE;
1333
1334 /* If -z nocopyreloc was given, we won't generate them either. */
1335 if (info->nocopyreloc)
1336 {
1337 h->non_got_ref = 0;
1338 return TRUE;
1339 }
1340
1341 if (ELIMINATE_COPY_RELOCS)
1342 {
1343 struct elf64_x86_64_link_hash_entry * eh;
1344 struct elf64_x86_64_dyn_relocs *p;
1345
1346 eh = (struct elf64_x86_64_link_hash_entry *) h;
1347 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1348 {
1349 s = p->sec->output_section;
1350 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1351 break;
1352 }
1353
1354 /* If we didn't find any dynamic relocs in read-only sections, then
1355 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1356 if (p == NULL)
1357 {
1358 h->non_got_ref = 0;
1359 return TRUE;
1360 }
1361 }
1362
1363 if (h->size == 0)
1364 {
1365 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1366 h->root.root.string);
1367 return TRUE;
1368 }
1369
1370 /* We must allocate the symbol in our .dynbss section, which will
1371 become part of the .bss section of the executable. There will be
1372 an entry for this symbol in the .dynsym section. The dynamic
1373 object will contain position independent code, so all references
1374 from the dynamic object to this symbol will go through the global
1375 offset table. The dynamic linker will use the .dynsym entry to
1376 determine the address it must put in the global offset table, so
1377 both the dynamic object and the regular object will refer to the
1378 same memory location for the variable. */
1379
1380 htab = elf64_x86_64_hash_table (info);
1381
1382 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1383 to copy the initial value out of the dynamic object and into the
1384 runtime process image. */
1385 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1386 {
1387 htab->srelbss->size += sizeof (Elf64_External_Rela);
1388 h->needs_copy = 1;
1389 }
1390
1391 /* We need to figure out the alignment required for this symbol. I
1392 have no idea how ELF linkers handle this. 16-bytes is the size
1393 of the largest type that requires hard alignment -- long double. */
1394 /* FIXME: This is VERY ugly. Should be fixed for all architectures using
1395 this construct. */
1396 power_of_two = bfd_log2 (h->size);
1397 if (power_of_two > 4)
1398 power_of_two = 4;
1399
1400 /* Apply the required alignment. */
1401 s = htab->sdynbss;
1402 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1403 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1404 {
1405 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1406 return FALSE;
1407 }
1408
1409 /* Define the symbol as being at this point in the section. */
1410 h->root.u.def.section = s;
1411 h->root.u.def.value = s->size;
1412
1413 /* Increment the section size to make room for the symbol. */
1414 s->size += h->size;
1415
1416 return TRUE;
1417 }
1418
1419 /* Allocate space in .plt, .got and associated reloc sections for
1420 dynamic relocs. */
1421
1422 static bfd_boolean
1423 allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1424 {
1425 struct bfd_link_info *info;
1426 struct elf64_x86_64_link_hash_table *htab;
1427 struct elf64_x86_64_link_hash_entry *eh;
1428 struct elf64_x86_64_dyn_relocs *p;
1429
1430 if (h->root.type == bfd_link_hash_indirect)
1431 return TRUE;
1432
1433 if (h->root.type == bfd_link_hash_warning)
1434 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1435
1436 info = (struct bfd_link_info *) inf;
1437 htab = elf64_x86_64_hash_table (info);
1438
1439 if (htab->elf.dynamic_sections_created
1440 && h->plt.refcount > 0)
1441 {
1442 /* Make sure this symbol is output as a dynamic symbol.
1443 Undefined weak syms won't yet be marked as dynamic. */
1444 if (h->dynindx == -1
1445 && !h->forced_local)
1446 {
1447 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1448 return FALSE;
1449 }
1450
1451 if (info->shared
1452 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1453 {
1454 asection *s = htab->splt;
1455
1456 /* If this is the first .plt entry, make room for the special
1457 first entry. */
1458 if (s->size == 0)
1459 s->size += PLT_ENTRY_SIZE;
1460
1461 h->plt.offset = s->size;
1462
1463 /* If this symbol is not defined in a regular file, and we are
1464 not generating a shared library, then set the symbol to this
1465 location in the .plt. This is required to make function
1466 pointers compare as equal between the normal executable and
1467 the shared library. */
1468 if (! info->shared
1469 && !h->def_regular)
1470 {
1471 h->root.u.def.section = s;
1472 h->root.u.def.value = h->plt.offset;
1473 }
1474
1475 /* Make room for this entry. */
1476 s->size += PLT_ENTRY_SIZE;
1477
1478 /* We also need to make an entry in the .got.plt section, which
1479 will be placed in the .got section by the linker script. */
1480 htab->sgotplt->size += GOT_ENTRY_SIZE;
1481
1482 /* We also need to make an entry in the .rela.plt section. */
1483 htab->srelplt->size += sizeof (Elf64_External_Rela);
1484 htab->srelplt->reloc_count++;
1485 }
1486 else
1487 {
1488 h->plt.offset = (bfd_vma) -1;
1489 h->needs_plt = 0;
1490 }
1491 }
1492 else
1493 {
1494 h->plt.offset = (bfd_vma) -1;
1495 h->needs_plt = 0;
1496 }
1497
1498 eh = (struct elf64_x86_64_link_hash_entry *) h;
1499 eh->tlsdesc_got = (bfd_vma) -1;
1500
1501 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1502 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
1503 if (h->got.refcount > 0
1504 && !info->shared
1505 && h->dynindx == -1
1506 && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
1507 h->got.offset = (bfd_vma) -1;
1508 else if (h->got.refcount > 0)
1509 {
1510 asection *s;
1511 bfd_boolean dyn;
1512 int tls_type = elf64_x86_64_hash_entry (h)->tls_type;
1513
1514 /* Make sure this symbol is output as a dynamic symbol.
1515 Undefined weak syms won't yet be marked as dynamic. */
1516 if (h->dynindx == -1
1517 && !h->forced_local)
1518 {
1519 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1520 return FALSE;
1521 }
1522
1523 if (GOT_TLS_GDESC_P (tls_type))
1524 {
1525 eh->tlsdesc_got = htab->sgotplt->size
1526 - elf64_x86_64_compute_jump_table_size (htab);
1527 htab->sgotplt->size += 2 * GOT_ENTRY_SIZE;
1528 h->got.offset = (bfd_vma) -2;
1529 }
1530 if (! GOT_TLS_GDESC_P (tls_type)
1531 || GOT_TLS_GD_P (tls_type))
1532 {
1533 s = htab->sgot;
1534 h->got.offset = s->size;
1535 s->size += GOT_ENTRY_SIZE;
1536 if (GOT_TLS_GD_P (tls_type))
1537 s->size += GOT_ENTRY_SIZE;
1538 }
1539 dyn = htab->elf.dynamic_sections_created;
1540 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
1541 and two if global.
1542 R_X86_64_GOTTPOFF needs one dynamic relocation. */
1543 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
1544 || tls_type == GOT_TLS_IE)
1545 htab->srelgot->size += sizeof (Elf64_External_Rela);
1546 else if (GOT_TLS_GD_P (tls_type))
1547 htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
1548 else if (! GOT_TLS_GDESC_P (tls_type)
1549 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1550 || h->root.type != bfd_link_hash_undefweak)
1551 && (info->shared
1552 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1553 htab->srelgot->size += sizeof (Elf64_External_Rela);
1554 if (GOT_TLS_GDESC_P (tls_type))
1555 {
1556 htab->srelplt->size += sizeof (Elf64_External_Rela);
1557 htab->tlsdesc_plt = (bfd_vma) -1;
1558 }
1559 }
1560 else
1561 h->got.offset = (bfd_vma) -1;
1562
1563 if (eh->dyn_relocs == NULL)
1564 return TRUE;
1565
1566 /* In the shared -Bsymbolic case, discard space allocated for
1567 dynamic pc-relative relocs against symbols which turn out to be
1568 defined in regular objects. For the normal shared case, discard
1569 space for pc-relative relocs that have become local due to symbol
1570 visibility changes. */
1571
1572 if (info->shared)
1573 {
1574 /* Relocs that use pc_count are those that appear on a call
1575 insn, or certain REL relocs that can generated via assembly.
1576 We want calls to protected symbols to resolve directly to the
1577 function rather than going via the plt. If people want
1578 function pointer comparisons to work as expected then they
1579 should avoid writing weird assembly. */
1580 if (SYMBOL_CALLS_LOCAL (info, h))
1581 {
1582 struct elf64_x86_64_dyn_relocs **pp;
1583
1584 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1585 {
1586 p->count -= p->pc_count;
1587 p->pc_count = 0;
1588 if (p->count == 0)
1589 *pp = p->next;
1590 else
1591 pp = &p->next;
1592 }
1593 }
1594
1595 /* Also discard relocs on undefined weak syms with non-default
1596 visibility. */
1597 if (eh->dyn_relocs != NULL
1598 && h->root.type == bfd_link_hash_undefweak)
1599 {
1600 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1601 eh->dyn_relocs = NULL;
1602
1603 /* Make sure undefined weak symbols are output as a dynamic
1604 symbol in PIEs. */
1605 else if (h->dynindx == -1
1606 && !h->forced_local)
1607 {
1608 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1609 return FALSE;
1610 }
1611 }
1612 }
1613 else if (ELIMINATE_COPY_RELOCS)
1614 {
1615 /* For the non-shared case, discard space for relocs against
1616 symbols which turn out to need copy relocs or are not
1617 dynamic. */
1618
1619 if (!h->non_got_ref
1620 && ((h->def_dynamic
1621 && !h->def_regular)
1622 || (htab->elf.dynamic_sections_created
1623 && (h->root.type == bfd_link_hash_undefweak
1624 || h->root.type == bfd_link_hash_undefined))))
1625 {
1626 /* Make sure this symbol is output as a dynamic symbol.
1627 Undefined weak syms won't yet be marked as dynamic. */
1628 if (h->dynindx == -1
1629 && !h->forced_local)
1630 {
1631 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1632 return FALSE;
1633 }
1634
1635 /* If that succeeded, we know we'll be keeping all the
1636 relocs. */
1637 if (h->dynindx != -1)
1638 goto keep;
1639 }
1640
1641 eh->dyn_relocs = NULL;
1642
1643 keep: ;
1644 }
1645
1646 /* Finally, allocate space. */
1647 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1648 {
1649 asection *sreloc = elf_section_data (p->sec)->sreloc;
1650 sreloc->size += p->count * sizeof (Elf64_External_Rela);
1651 }
1652
1653 return TRUE;
1654 }
1655
1656 /* Find any dynamic relocs that apply to read-only sections. */
1657
1658 static bfd_boolean
1659 readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1660 {
1661 struct elf64_x86_64_link_hash_entry *eh;
1662 struct elf64_x86_64_dyn_relocs *p;
1663
1664 if (h->root.type == bfd_link_hash_warning)
1665 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1666
1667 eh = (struct elf64_x86_64_link_hash_entry *) h;
1668 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1669 {
1670 asection *s = p->sec->output_section;
1671
1672 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1673 {
1674 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1675
1676 info->flags |= DF_TEXTREL;
1677
1678 /* Not an error, just cut short the traversal. */
1679 return FALSE;
1680 }
1681 }
1682 return TRUE;
1683 }
1684
1685 /* Set the sizes of the dynamic sections. */
1686
1687 static bfd_boolean
1688 elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1689 struct bfd_link_info *info)
1690 {
1691 struct elf64_x86_64_link_hash_table *htab;
1692 bfd *dynobj;
1693 asection *s;
1694 bfd_boolean relocs;
1695 bfd *ibfd;
1696
1697 htab = elf64_x86_64_hash_table (info);
1698 dynobj = htab->elf.dynobj;
1699 if (dynobj == NULL)
1700 abort ();
1701
1702 if (htab->elf.dynamic_sections_created)
1703 {
1704 /* Set the contents of the .interp section to the interpreter. */
1705 if (info->executable)
1706 {
1707 s = bfd_get_section_by_name (dynobj, ".interp");
1708 if (s == NULL)
1709 abort ();
1710 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1711 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1712 }
1713 }
1714
1715 /* Set up .got offsets for local syms, and space for local dynamic
1716 relocs. */
1717 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1718 {
1719 bfd_signed_vma *local_got;
1720 bfd_signed_vma *end_local_got;
1721 char *local_tls_type;
1722 bfd_vma *local_tlsdesc_gotent;
1723 bfd_size_type locsymcount;
1724 Elf_Internal_Shdr *symtab_hdr;
1725 asection *srel;
1726
1727 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1728 continue;
1729
1730 for (s = ibfd->sections; s != NULL; s = s->next)
1731 {
1732 struct elf64_x86_64_dyn_relocs *p;
1733
1734 for (p = (struct elf64_x86_64_dyn_relocs *)
1735 (elf_section_data (s)->local_dynrel);
1736 p != NULL;
1737 p = p->next)
1738 {
1739 if (!bfd_is_abs_section (p->sec)
1740 && bfd_is_abs_section (p->sec->output_section))
1741 {
1742 /* Input section has been discarded, either because
1743 it is a copy of a linkonce section or due to
1744 linker script /DISCARD/, so we'll be discarding
1745 the relocs too. */
1746 }
1747 else if (p->count != 0)
1748 {
1749 srel = elf_section_data (p->sec)->sreloc;
1750 srel->size += p->count * sizeof (Elf64_External_Rela);
1751 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1752 info->flags |= DF_TEXTREL;
1753
1754 }
1755 }
1756 }
1757
1758 local_got = elf_local_got_refcounts (ibfd);
1759 if (!local_got)
1760 continue;
1761
1762 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1763 locsymcount = symtab_hdr->sh_info;
1764 end_local_got = local_got + locsymcount;
1765 local_tls_type = elf64_x86_64_local_got_tls_type (ibfd);
1766 local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd);
1767 s = htab->sgot;
1768 srel = htab->srelgot;
1769 for (; local_got < end_local_got;
1770 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
1771 {
1772 *local_tlsdesc_gotent = (bfd_vma) -1;
1773 if (*local_got > 0)
1774 {
1775 if (GOT_TLS_GDESC_P (*local_tls_type))
1776 {
1777 *local_tlsdesc_gotent = htab->sgotplt->size
1778 - elf64_x86_64_compute_jump_table_size (htab);
1779 htab->sgotplt->size += 2 * GOT_ENTRY_SIZE;
1780 *local_got = (bfd_vma) -2;
1781 }
1782 if (! GOT_TLS_GDESC_P (*local_tls_type)
1783 || GOT_TLS_GD_P (*local_tls_type))
1784 {
1785 *local_got = s->size;
1786 s->size += GOT_ENTRY_SIZE;
1787 if (GOT_TLS_GD_P (*local_tls_type))
1788 s->size += GOT_ENTRY_SIZE;
1789 }
1790 if (info->shared
1791 || GOT_TLS_GD_ANY_P (*local_tls_type)
1792 || *local_tls_type == GOT_TLS_IE)
1793 {
1794 if (GOT_TLS_GDESC_P (*local_tls_type))
1795 {
1796 htab->srelplt->size += sizeof (Elf64_External_Rela);
1797 htab->tlsdesc_plt = (bfd_vma) -1;
1798 }
1799 if (! GOT_TLS_GDESC_P (*local_tls_type)
1800 || GOT_TLS_GD_P (*local_tls_type))
1801 srel->size += sizeof (Elf64_External_Rela);
1802 }
1803 }
1804 else
1805 *local_got = (bfd_vma) -1;
1806 }
1807 }
1808
1809 if (htab->tls_ld_got.refcount > 0)
1810 {
1811 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
1812 relocs. */
1813 htab->tls_ld_got.offset = htab->sgot->size;
1814 htab->sgot->size += 2 * GOT_ENTRY_SIZE;
1815 htab->srelgot->size += sizeof (Elf64_External_Rela);
1816 }
1817 else
1818 htab->tls_ld_got.offset = -1;
1819
1820 /* Allocate global sym .plt and .got entries, and space for global
1821 sym dynamic relocs. */
1822 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1823
1824 /* For every jump slot reserved in the sgotplt, reloc_count is
1825 incremented. However, when we reserve space for TLS descriptors,
1826 it's not incremented, so in order to compute the space reserved
1827 for them, it suffices to multiply the reloc count by the jump
1828 slot size. */
1829 if (htab->srelplt)
1830 htab->sgotplt_jump_table_size
1831 = elf64_x86_64_compute_jump_table_size (htab);
1832
1833 if (htab->tlsdesc_plt)
1834 {
1835 /* If we're not using lazy TLS relocations, don't generate the
1836 PLT and GOT entries they require. */
1837 if ((info->flags & DF_BIND_NOW))
1838 htab->tlsdesc_plt = 0;
1839 else
1840 {
1841 htab->tlsdesc_got = htab->sgot->size;
1842 htab->sgot->size += GOT_ENTRY_SIZE;
1843 /* Reserve room for the initial entry.
1844 FIXME: we could probably do away with it in this case. */
1845 if (htab->splt->size == 0)
1846 htab->splt->size += PLT_ENTRY_SIZE;
1847 htab->tlsdesc_plt = htab->splt->size;
1848 htab->splt->size += PLT_ENTRY_SIZE;
1849 }
1850 }
1851
1852 /* We now have determined the sizes of the various dynamic sections.
1853 Allocate memory for them. */
1854 relocs = FALSE;
1855 for (s = dynobj->sections; s != NULL; s = s->next)
1856 {
1857 if ((s->flags & SEC_LINKER_CREATED) == 0)
1858 continue;
1859
1860 if (s == htab->splt
1861 || s == htab->sgot
1862 || s == htab->sgotplt
1863 || s == htab->sdynbss)
1864 {
1865 /* Strip this section if we don't need it; see the
1866 comment below. */
1867 }
1868 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
1869 {
1870 if (s->size != 0 && s != htab->srelplt)
1871 relocs = TRUE;
1872
1873 /* We use the reloc_count field as a counter if we need
1874 to copy relocs into the output file. */
1875 if (s != htab->srelplt)
1876 s->reloc_count = 0;
1877 }
1878 else
1879 {
1880 /* It's not one of our sections, so don't allocate space. */
1881 continue;
1882 }
1883
1884 if (s->size == 0)
1885 {
1886 /* If we don't need this section, strip it from the
1887 output file. This is mostly to handle .rela.bss and
1888 .rela.plt. We must create both sections in
1889 create_dynamic_sections, because they must be created
1890 before the linker maps input sections to output
1891 sections. The linker does that before
1892 adjust_dynamic_symbol is called, and it is that
1893 function which decides whether anything needs to go
1894 into these sections. */
1895
1896 s->flags |= SEC_EXCLUDE;
1897 continue;
1898 }
1899
1900 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1901 continue;
1902
1903 /* Allocate memory for the section contents. We use bfd_zalloc
1904 here in case unused entries are not reclaimed before the
1905 section's contents are written out. This should not happen,
1906 but this way if it does, we get a R_X86_64_NONE reloc instead
1907 of garbage. */
1908 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
1909 if (s->contents == NULL)
1910 return FALSE;
1911 }
1912
1913 if (htab->elf.dynamic_sections_created)
1914 {
1915 /* Add some entries to the .dynamic section. We fill in the
1916 values later, in elf64_x86_64_finish_dynamic_sections, but we
1917 must add the entries now so that we get the correct size for
1918 the .dynamic section. The DT_DEBUG entry is filled in by the
1919 dynamic linker and used by the debugger. */
1920 #define add_dynamic_entry(TAG, VAL) \
1921 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1922
1923 if (info->executable)
1924 {
1925 if (!add_dynamic_entry (DT_DEBUG, 0))
1926 return FALSE;
1927 }
1928
1929 if (htab->splt->size != 0)
1930 {
1931 if (!add_dynamic_entry (DT_PLTGOT, 0)
1932 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1933 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
1934 || !add_dynamic_entry (DT_JMPREL, 0))
1935 return FALSE;
1936
1937 if (htab->tlsdesc_plt
1938 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
1939 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
1940 return FALSE;
1941 }
1942
1943 if (relocs)
1944 {
1945 if (!add_dynamic_entry (DT_RELA, 0)
1946 || !add_dynamic_entry (DT_RELASZ, 0)
1947 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
1948 return FALSE;
1949
1950 /* If any dynamic relocs apply to a read-only section,
1951 then we need a DT_TEXTREL entry. */
1952 if ((info->flags & DF_TEXTREL) == 0)
1953 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1954 (PTR) info);
1955
1956 if ((info->flags & DF_TEXTREL) != 0)
1957 {
1958 if (!add_dynamic_entry (DT_TEXTREL, 0))
1959 return FALSE;
1960 }
1961 }
1962 }
1963 #undef add_dynamic_entry
1964
1965 return TRUE;
1966 }
1967
1968 static bfd_boolean
1969 elf64_x86_64_always_size_sections (bfd *output_bfd,
1970 struct bfd_link_info *info)
1971 {
1972 asection *tls_sec = elf_hash_table (info)->tls_sec;
1973
1974 if (tls_sec)
1975 {
1976 struct elf_link_hash_entry *tlsbase;
1977
1978 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
1979 "_TLS_MODULE_BASE_",
1980 FALSE, FALSE, FALSE);
1981
1982 if (tlsbase && tlsbase->type == STT_TLS)
1983 {
1984 struct bfd_link_hash_entry *bh = NULL;
1985 const struct elf_backend_data *bed
1986 = get_elf_backend_data (output_bfd);
1987
1988 if (!(_bfd_generic_link_add_one_symbol
1989 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
1990 tls_sec, 0, NULL, FALSE,
1991 bed->collect, &bh)))
1992 return FALSE;
1993 tlsbase = (struct elf_link_hash_entry *)bh;
1994 tlsbase->def_regular = 1;
1995 tlsbase->other = STV_HIDDEN;
1996 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
1997 }
1998 }
1999
2000 return TRUE;
2001 }
2002
2003 /* Return the base VMA address which should be subtracted from real addresses
2004 when resolving @dtpoff relocation.
2005 This is PT_TLS segment p_vaddr. */
2006
2007 static bfd_vma
2008 dtpoff_base (struct bfd_link_info *info)
2009 {
2010 /* If tls_sec is NULL, we should have signalled an error already. */
2011 if (elf_hash_table (info)->tls_sec == NULL)
2012 return 0;
2013 return elf_hash_table (info)->tls_sec->vma;
2014 }
2015
2016 /* Return the relocation value for @tpoff relocation
2017 if STT_TLS virtual address is ADDRESS. */
2018
2019 static bfd_vma
2020 tpoff (struct bfd_link_info *info, bfd_vma address)
2021 {
2022 struct elf_link_hash_table *htab = elf_hash_table (info);
2023
2024 /* If tls_segment is NULL, we should have signalled an error already. */
2025 if (htab->tls_sec == NULL)
2026 return 0;
2027 return address - htab->tls_size - htab->tls_sec->vma;
2028 }
2029
2030 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2031 branch? */
2032
2033 static bfd_boolean
2034 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
2035 {
2036 /* Opcode Instruction
2037 0xe8 call
2038 0xe9 jump
2039 0x0f 0x8x conditional jump */
2040 return ((offset > 0
2041 && (contents [offset - 1] == 0xe8
2042 || contents [offset - 1] == 0xe9))
2043 || (offset > 1
2044 && contents [offset - 2] == 0x0f
2045 && (contents [offset - 1] & 0xf0) == 0x80));
2046 }
2047
2048 /* Relocate an x86_64 ELF section. */
2049
2050 static bfd_boolean
2051 elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
2052 bfd *input_bfd, asection *input_section,
2053 bfd_byte *contents, Elf_Internal_Rela *relocs,
2054 Elf_Internal_Sym *local_syms,
2055 asection **local_sections)
2056 {
2057 struct elf64_x86_64_link_hash_table *htab;
2058 Elf_Internal_Shdr *symtab_hdr;
2059 struct elf_link_hash_entry **sym_hashes;
2060 bfd_vma *local_got_offsets;
2061 bfd_vma *local_tlsdesc_gotents;
2062 Elf_Internal_Rela *rel;
2063 Elf_Internal_Rela *relend;
2064
2065 if (info->relocatable)
2066 return TRUE;
2067
2068 htab = elf64_x86_64_hash_table (info);
2069 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2070 sym_hashes = elf_sym_hashes (input_bfd);
2071 local_got_offsets = elf_local_got_offsets (input_bfd);
2072 local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd);
2073
2074 rel = relocs;
2075 relend = relocs + input_section->reloc_count;
2076 for (; rel < relend; rel++)
2077 {
2078 unsigned int r_type;
2079 reloc_howto_type *howto;
2080 unsigned long r_symndx;
2081 struct elf_link_hash_entry *h;
2082 Elf_Internal_Sym *sym;
2083 asection *sec;
2084 bfd_vma off, offplt;
2085 bfd_vma relocation;
2086 bfd_boolean unresolved_reloc;
2087 bfd_reloc_status_type r;
2088 int tls_type;
2089
2090 r_type = ELF64_R_TYPE (rel->r_info);
2091 if (r_type == (int) R_X86_64_GNU_VTINHERIT
2092 || r_type == (int) R_X86_64_GNU_VTENTRY)
2093 continue;
2094
2095 if (r_type >= R_X86_64_max)
2096 {
2097 bfd_set_error (bfd_error_bad_value);
2098 return FALSE;
2099 }
2100
2101 howto = x86_64_elf_howto_table + r_type;
2102 r_symndx = ELF64_R_SYM (rel->r_info);
2103 h = NULL;
2104 sym = NULL;
2105 sec = NULL;
2106 unresolved_reloc = FALSE;
2107 if (r_symndx < symtab_hdr->sh_info)
2108 {
2109 sym = local_syms + r_symndx;
2110 sec = local_sections[r_symndx];
2111
2112 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
2113 }
2114 else
2115 {
2116 bfd_boolean warned;
2117
2118 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2119 r_symndx, symtab_hdr, sym_hashes,
2120 h, sec, relocation,
2121 unresolved_reloc, warned);
2122 }
2123 /* When generating a shared object, the relocations handled here are
2124 copied into the output file to be resolved at run time. */
2125 switch (r_type)
2126 {
2127 asection *base_got;
2128 case R_X86_64_GOT32:
2129 case R_X86_64_GOT64:
2130 /* Relocation is to the entry for this symbol in the global
2131 offset table. */
2132 case R_X86_64_GOTPCREL:
2133 case R_X86_64_GOTPCREL64:
2134 /* Use global offset table entry as symbol value. */
2135 case R_X86_64_GOTPLT64:
2136 /* This is the same as GOT64 for relocation purposes, but
2137 indicates the existence of a PLT entry. The difficulty is,
2138 that we must calculate the GOT slot offset from the PLT
2139 offset, if this symbol got a PLT entry (it was global).
2140 Additionally if it's computed from the PLT entry, then that
2141 GOT offset is relative to .got.plt, not to .got. */
2142 base_got = htab->sgot;
2143
2144 if (htab->sgot == NULL)
2145 abort ();
2146
2147 if (h != NULL)
2148 {
2149 bfd_boolean dyn;
2150
2151 off = h->got.offset;
2152 if (h->needs_plt
2153 && h->plt.offset != (bfd_vma)-1
2154 && off == (bfd_vma)-1)
2155 {
2156 /* We can't use h->got.offset here to save
2157 state, or even just remember the offset, as
2158 finish_dynamic_symbol would use that as offset into
2159 .got. */
2160 bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2161 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2162 base_got = htab->sgotplt;
2163 }
2164
2165 dyn = htab->elf.dynamic_sections_created;
2166
2167 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2168 || (info->shared
2169 && SYMBOL_REFERENCES_LOCAL (info, h))
2170 || (ELF_ST_VISIBILITY (h->other)
2171 && h->root.type == bfd_link_hash_undefweak))
2172 {
2173 /* This is actually a static link, or it is a -Bsymbolic
2174 link and the symbol is defined locally, or the symbol
2175 was forced to be local because of a version file. We
2176 must initialize this entry in the global offset table.
2177 Since the offset must always be a multiple of 8, we
2178 use the least significant bit to record whether we
2179 have initialized it already.
2180
2181 When doing a dynamic link, we create a .rela.got
2182 relocation entry to initialize the value. This is
2183 done in the finish_dynamic_symbol routine. */
2184 if ((off & 1) != 0)
2185 off &= ~1;
2186 else
2187 {
2188 bfd_put_64 (output_bfd, relocation,
2189 base_got->contents + off);
2190 /* Note that this is harmless for the GOTPLT64 case,
2191 as -1 | 1 still is -1. */
2192 h->got.offset |= 1;
2193 }
2194 }
2195 else
2196 unresolved_reloc = FALSE;
2197 }
2198 else
2199 {
2200 if (local_got_offsets == NULL)
2201 abort ();
2202
2203 off = local_got_offsets[r_symndx];
2204
2205 /* The offset must always be a multiple of 8. We use
2206 the least significant bit to record whether we have
2207 already generated the necessary reloc. */
2208 if ((off & 1) != 0)
2209 off &= ~1;
2210 else
2211 {
2212 bfd_put_64 (output_bfd, relocation,
2213 base_got->contents + off);
2214
2215 if (info->shared)
2216 {
2217 asection *s;
2218 Elf_Internal_Rela outrel;
2219 bfd_byte *loc;
2220
2221 /* We need to generate a R_X86_64_RELATIVE reloc
2222 for the dynamic linker. */
2223 s = htab->srelgot;
2224 if (s == NULL)
2225 abort ();
2226
2227 outrel.r_offset = (base_got->output_section->vma
2228 + base_got->output_offset
2229 + off);
2230 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
2231 outrel.r_addend = relocation;
2232 loc = s->contents;
2233 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2234 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2235 }
2236
2237 local_got_offsets[r_symndx] |= 1;
2238 }
2239 }
2240
2241 if (off >= (bfd_vma) -2)
2242 abort ();
2243
2244 relocation = base_got->output_section->vma
2245 + base_got->output_offset + off;
2246 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
2247 relocation -= htab->sgotplt->output_section->vma
2248 - htab->sgotplt->output_offset;
2249
2250 break;
2251
2252 case R_X86_64_GOTOFF64:
2253 /* Relocation is relative to the start of the global offset
2254 table. */
2255
2256 /* Check to make sure it isn't a protected function symbol
2257 for shared library since it may not be local when used
2258 as function address. */
2259 if (info->shared
2260 && h
2261 && h->def_regular
2262 && h->type == STT_FUNC
2263 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2264 {
2265 (*_bfd_error_handler)
2266 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
2267 input_bfd, h->root.root.string);
2268 bfd_set_error (bfd_error_bad_value);
2269 return FALSE;
2270 }
2271
2272 /* Note that sgot is not involved in this
2273 calculation. We always want the start of .got.plt. If we
2274 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2275 permitted by the ABI, we might have to change this
2276 calculation. */
2277 relocation -= htab->sgotplt->output_section->vma
2278 + htab->sgotplt->output_offset;
2279 break;
2280
2281 case R_X86_64_GOTPC32:
2282 case R_X86_64_GOTPC64:
2283 /* Use global offset table as symbol value. */
2284 relocation = htab->sgotplt->output_section->vma
2285 + htab->sgotplt->output_offset;
2286 unresolved_reloc = FALSE;
2287 break;
2288
2289 case R_X86_64_PLTOFF64:
2290 /* Relocation is PLT entry relative to GOT. For local
2291 symbols it's the symbol itself relative to GOT. */
2292 if (h != NULL
2293 /* See PLT32 handling. */
2294 && h->plt.offset != (bfd_vma) -1
2295 && htab->splt != NULL)
2296 {
2297 relocation = (htab->splt->output_section->vma
2298 + htab->splt->output_offset
2299 + h->plt.offset);
2300 unresolved_reloc = FALSE;
2301 }
2302
2303 relocation -= htab->sgotplt->output_section->vma
2304 + htab->sgotplt->output_offset;
2305 break;
2306
2307 case R_X86_64_PLT32:
2308 /* Relocation is to the entry for this symbol in the
2309 procedure linkage table. */
2310
2311 /* Resolve a PLT32 reloc against a local symbol directly,
2312 without using the procedure linkage table. */
2313 if (h == NULL)
2314 break;
2315
2316 if (h->plt.offset == (bfd_vma) -1
2317 || htab->splt == NULL)
2318 {
2319 /* We didn't make a PLT entry for this symbol. This
2320 happens when statically linking PIC code, or when
2321 using -Bsymbolic. */
2322 break;
2323 }
2324
2325 relocation = (htab->splt->output_section->vma
2326 + htab->splt->output_offset
2327 + h->plt.offset);
2328 unresolved_reloc = FALSE;
2329 break;
2330
2331 case R_X86_64_PC8:
2332 case R_X86_64_PC16:
2333 case R_X86_64_PC32:
2334 if (info->shared
2335 && !SYMBOL_REFERENCES_LOCAL (info, h)
2336 && (input_section->flags & SEC_ALLOC) != 0
2337 && (input_section->flags & SEC_READONLY) != 0
2338 && (!h->def_regular
2339 || r_type != R_X86_64_PC32
2340 || h->type != STT_FUNC
2341 || ELF_ST_VISIBILITY (h->other) != STV_PROTECTED
2342 || !is_32bit_relative_branch (contents,
2343 rel->r_offset)))
2344 {
2345 if (h->def_regular
2346 && r_type == R_X86_64_PC32
2347 && h->type == STT_FUNC
2348 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2349 (*_bfd_error_handler)
2350 (_("%B: relocation R_X86_64_PC32 against protected function `%s' can not be used when making a shared object"),
2351 input_bfd, h->root.root.string);
2352 else
2353 (*_bfd_error_handler)
2354 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
2355 input_bfd, x86_64_elf_howto_table[r_type].name,
2356 h->root.root.string);
2357 bfd_set_error (bfd_error_bad_value);
2358 return FALSE;
2359 }
2360 /* Fall through. */
2361
2362 case R_X86_64_8:
2363 case R_X86_64_16:
2364 case R_X86_64_32:
2365 case R_X86_64_PC64:
2366 case R_X86_64_64:
2367 /* FIXME: The ABI says the linker should make sure the value is
2368 the same when it's zeroextended to 64 bit. */
2369
2370 /* r_symndx will be zero only for relocs against symbols
2371 from removed linkonce sections, or sections discarded by
2372 a linker script. */
2373 if (r_symndx == 0
2374 || (input_section->flags & SEC_ALLOC) == 0)
2375 break;
2376
2377 if ((info->shared
2378 && (h == NULL
2379 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2380 || h->root.type != bfd_link_hash_undefweak)
2381 && ((r_type != R_X86_64_PC8
2382 && r_type != R_X86_64_PC16
2383 && r_type != R_X86_64_PC32
2384 && r_type != R_X86_64_PC64)
2385 || !SYMBOL_CALLS_LOCAL (info, h)))
2386 || (ELIMINATE_COPY_RELOCS
2387 && !info->shared
2388 && h != NULL
2389 && h->dynindx != -1
2390 && !h->non_got_ref
2391 && ((h->def_dynamic
2392 && !h->def_regular)
2393 || h->root.type == bfd_link_hash_undefweak
2394 || h->root.type == bfd_link_hash_undefined)))
2395 {
2396 Elf_Internal_Rela outrel;
2397 bfd_byte *loc;
2398 bfd_boolean skip, relocate;
2399 asection *sreloc;
2400
2401 /* When generating a shared object, these relocations
2402 are copied into the output file to be resolved at run
2403 time. */
2404 skip = FALSE;
2405 relocate = FALSE;
2406
2407 outrel.r_offset =
2408 _bfd_elf_section_offset (output_bfd, info, input_section,
2409 rel->r_offset);
2410 if (outrel.r_offset == (bfd_vma) -1)
2411 skip = TRUE;
2412 else if (outrel.r_offset == (bfd_vma) -2)
2413 skip = TRUE, relocate = TRUE;
2414
2415 outrel.r_offset += (input_section->output_section->vma
2416 + input_section->output_offset);
2417
2418 if (skip)
2419 memset (&outrel, 0, sizeof outrel);
2420
2421 /* h->dynindx may be -1 if this symbol was marked to
2422 become local. */
2423 else if (h != NULL
2424 && h->dynindx != -1
2425 && (r_type == R_X86_64_PC8
2426 || r_type == R_X86_64_PC16
2427 || r_type == R_X86_64_PC32
2428 || r_type == R_X86_64_PC64
2429 || !info->shared
2430 || !SYMBOLIC_BIND (info, h)
2431 || !h->def_regular))
2432 {
2433 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2434 outrel.r_addend = rel->r_addend;
2435 }
2436 else
2437 {
2438 /* This symbol is local, or marked to become local. */
2439 if (r_type == R_X86_64_64)
2440 {
2441 relocate = TRUE;
2442 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
2443 outrel.r_addend = relocation + rel->r_addend;
2444 }
2445 else
2446 {
2447 long sindx;
2448
2449 if (bfd_is_abs_section (sec))
2450 sindx = 0;
2451 else if (sec == NULL || sec->owner == NULL)
2452 {
2453 bfd_set_error (bfd_error_bad_value);
2454 return FALSE;
2455 }
2456 else
2457 {
2458 asection *osec;
2459
2460 /* We are turning this relocation into one
2461 against a section symbol. It would be
2462 proper to subtract the symbol's value,
2463 osec->vma, from the emitted reloc addend,
2464 but ld.so expects buggy relocs. */
2465 osec = sec->output_section;
2466 sindx = elf_section_data (osec)->dynindx;
2467 if (sindx == 0)
2468 {
2469 asection *oi = htab->elf.text_index_section;
2470 sindx = elf_section_data (oi)->dynindx;
2471 }
2472 BFD_ASSERT (sindx != 0);
2473 }
2474
2475 outrel.r_info = ELF64_R_INFO (sindx, r_type);
2476 outrel.r_addend = relocation + rel->r_addend;
2477 }
2478 }
2479
2480 sreloc = elf_section_data (input_section)->sreloc;
2481 if (sreloc == NULL)
2482 abort ();
2483
2484 loc = sreloc->contents;
2485 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2486 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2487
2488 /* If this reloc is against an external symbol, we do
2489 not want to fiddle with the addend. Otherwise, we
2490 need to include the symbol value so that it becomes
2491 an addend for the dynamic reloc. */
2492 if (! relocate)
2493 continue;
2494 }
2495
2496 break;
2497
2498 case R_X86_64_TLSGD:
2499 case R_X86_64_GOTPC32_TLSDESC:
2500 case R_X86_64_TLSDESC_CALL:
2501 case R_X86_64_GOTTPOFF:
2502 r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL);
2503 tls_type = GOT_UNKNOWN;
2504 if (h == NULL && local_got_offsets)
2505 tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx];
2506 else if (h != NULL)
2507 {
2508 tls_type = elf64_x86_64_hash_entry (h)->tls_type;
2509 if (!info->shared && h->dynindx == -1 && tls_type == GOT_TLS_IE)
2510 r_type = R_X86_64_TPOFF32;
2511 }
2512 if (r_type == R_X86_64_TLSGD
2513 || r_type == R_X86_64_GOTPC32_TLSDESC
2514 || r_type == R_X86_64_TLSDESC_CALL)
2515 {
2516 if (tls_type == GOT_TLS_IE)
2517 r_type = R_X86_64_GOTTPOFF;
2518 }
2519
2520 if (r_type == R_X86_64_TPOFF32)
2521 {
2522 BFD_ASSERT (! unresolved_reloc);
2523 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
2524 {
2525 unsigned int i;
2526 static unsigned char tlsgd[8]
2527 = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 };
2528
2529 /* GD->LE transition.
2530 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
2531 .word 0x6666; rex64; call __tls_get_addr@plt
2532 Change it into:
2533 movq %fs:0, %rax
2534 leaq foo@tpoff(%rax), %rax */
2535 BFD_ASSERT (rel->r_offset >= 4);
2536 for (i = 0; i < 4; i++)
2537 BFD_ASSERT (bfd_get_8 (input_bfd,
2538 contents + rel->r_offset - 4 + i)
2539 == tlsgd[i]);
2540 BFD_ASSERT (rel->r_offset + 12 <= input_section->size);
2541 for (i = 0; i < 4; i++)
2542 BFD_ASSERT (bfd_get_8 (input_bfd,
2543 contents + rel->r_offset + 4 + i)
2544 == tlsgd[i+4]);
2545 BFD_ASSERT (rel + 1 < relend);
2546 BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
2547 memcpy (contents + rel->r_offset - 4,
2548 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
2549 16);
2550 bfd_put_32 (output_bfd, tpoff (info, relocation),
2551 contents + rel->r_offset + 8);
2552 /* Skip R_X86_64_PLT32. */
2553 rel++;
2554 continue;
2555 }
2556 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
2557 {
2558 /* GDesc -> LE transition.
2559 It's originally something like:
2560 leaq x@tlsdesc(%rip), %rax
2561
2562 Change it to:
2563 movl $x@tpoff, %rax
2564
2565 Registers other than %rax may be set up here. */
2566
2567 unsigned int val, type, type2;
2568 bfd_vma roff;
2569
2570 /* First, make sure it's a leaq adding rip to a
2571 32-bit offset into any register, although it's
2572 probably almost always going to be rax. */
2573 roff = rel->r_offset;
2574 BFD_ASSERT (roff >= 3);
2575 type = bfd_get_8 (input_bfd, contents + roff - 3);
2576 BFD_ASSERT ((type & 0xfb) == 0x48);
2577 type2 = bfd_get_8 (input_bfd, contents + roff - 2);
2578 BFD_ASSERT (type2 == 0x8d);
2579 val = bfd_get_8 (input_bfd, contents + roff - 1);
2580 BFD_ASSERT ((val & 0xc7) == 0x05);
2581 BFD_ASSERT (roff + 4 <= input_section->size);
2582
2583 /* Now modify the instruction as appropriate. */
2584 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
2585 contents + roff - 3);
2586 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
2587 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2588 contents + roff - 1);
2589 bfd_put_32 (output_bfd, tpoff (info, relocation),
2590 contents + roff);
2591 continue;
2592 }
2593 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
2594 {
2595 /* GDesc -> LE transition.
2596 It's originally:
2597 call *(%rax)
2598 Turn it into:
2599 nop; nop. */
2600
2601 unsigned int val, type;
2602 bfd_vma roff;
2603
2604 /* First, make sure it's a call *(%rax). */
2605 roff = rel->r_offset;
2606 BFD_ASSERT (roff + 2 <= input_section->size);
2607 type = bfd_get_8 (input_bfd, contents + roff);
2608 BFD_ASSERT (type == 0xff);
2609 val = bfd_get_8 (input_bfd, contents + roff + 1);
2610 BFD_ASSERT (val == 0x10);
2611
2612 /* Now modify the instruction as appropriate. Use
2613 xchg %ax,%ax instead of 2 nops. */
2614 bfd_put_8 (output_bfd, 0x66, contents + roff);
2615 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2616 continue;
2617 }
2618 else
2619 {
2620 unsigned int val, type, reg;
2621
2622 /* IE->LE transition:
2623 Originally it can be one of:
2624 movq foo@gottpoff(%rip), %reg
2625 addq foo@gottpoff(%rip), %reg
2626 We change it into:
2627 movq $foo, %reg
2628 leaq foo(%reg), %reg
2629 addq $foo, %reg. */
2630 BFD_ASSERT (rel->r_offset >= 3);
2631 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 3);
2632 BFD_ASSERT (val == 0x48 || val == 0x4c);
2633 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2634 BFD_ASSERT (type == 0x8b || type == 0x03);
2635 reg = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2636 BFD_ASSERT ((reg & 0xc7) == 5);
2637 reg >>= 3;
2638 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2639 if (type == 0x8b)
2640 {
2641 /* movq */
2642 if (val == 0x4c)
2643 bfd_put_8 (output_bfd, 0x49,
2644 contents + rel->r_offset - 3);
2645 bfd_put_8 (output_bfd, 0xc7,
2646 contents + rel->r_offset - 2);
2647 bfd_put_8 (output_bfd, 0xc0 | reg,
2648 contents + rel->r_offset - 1);
2649 }
2650 else if (reg == 4)
2651 {
2652 /* addq -> addq - addressing with %rsp/%r12 is
2653 special */
2654 if (val == 0x4c)
2655 bfd_put_8 (output_bfd, 0x49,
2656 contents + rel->r_offset - 3);
2657 bfd_put_8 (output_bfd, 0x81,
2658 contents + rel->r_offset - 2);
2659 bfd_put_8 (output_bfd, 0xc0 | reg,
2660 contents + rel->r_offset - 1);
2661 }
2662 else
2663 {
2664 /* addq -> leaq */
2665 if (val == 0x4c)
2666 bfd_put_8 (output_bfd, 0x4d,
2667 contents + rel->r_offset - 3);
2668 bfd_put_8 (output_bfd, 0x8d,
2669 contents + rel->r_offset - 2);
2670 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
2671 contents + rel->r_offset - 1);
2672 }
2673 bfd_put_32 (output_bfd, tpoff (info, relocation),
2674 contents + rel->r_offset);
2675 continue;
2676 }
2677 }
2678
2679 if (htab->sgot == NULL)
2680 abort ();
2681
2682 if (h != NULL)
2683 {
2684 off = h->got.offset;
2685 offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got;
2686 }
2687 else
2688 {
2689 if (local_got_offsets == NULL)
2690 abort ();
2691
2692 off = local_got_offsets[r_symndx];
2693 offplt = local_tlsdesc_gotents[r_symndx];
2694 }
2695
2696 if ((off & 1) != 0)
2697 off &= ~1;
2698 else
2699 {
2700 Elf_Internal_Rela outrel;
2701 bfd_byte *loc;
2702 int dr_type, indx;
2703 asection *sreloc;
2704
2705 if (htab->srelgot == NULL)
2706 abort ();
2707
2708 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2709
2710 if (GOT_TLS_GDESC_P (tls_type))
2711 {
2712 outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC);
2713 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
2714 + 2 * GOT_ENTRY_SIZE <= htab->sgotplt->size);
2715 outrel.r_offset = (htab->sgotplt->output_section->vma
2716 + htab->sgotplt->output_offset
2717 + offplt
2718 + htab->sgotplt_jump_table_size);
2719 sreloc = htab->srelplt;
2720 loc = sreloc->contents;
2721 loc += sreloc->reloc_count++
2722 * sizeof (Elf64_External_Rela);
2723 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
2724 <= sreloc->contents + sreloc->size);
2725 if (indx == 0)
2726 outrel.r_addend = relocation - dtpoff_base (info);
2727 else
2728 outrel.r_addend = 0;
2729 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2730 }
2731
2732 sreloc = htab->srelgot;
2733
2734 outrel.r_offset = (htab->sgot->output_section->vma
2735 + htab->sgot->output_offset + off);
2736
2737 if (GOT_TLS_GD_P (tls_type))
2738 dr_type = R_X86_64_DTPMOD64;
2739 else if (GOT_TLS_GDESC_P (tls_type))
2740 goto dr_done;
2741 else
2742 dr_type = R_X86_64_TPOFF64;
2743
2744 bfd_put_64 (output_bfd, 0, htab->sgot->contents + off);
2745 outrel.r_addend = 0;
2746 if ((dr_type == R_X86_64_TPOFF64
2747 || dr_type == R_X86_64_TLSDESC) && indx == 0)
2748 outrel.r_addend = relocation - dtpoff_base (info);
2749 outrel.r_info = ELF64_R_INFO (indx, dr_type);
2750
2751 loc = sreloc->contents;
2752 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
2753 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
2754 <= sreloc->contents + sreloc->size);
2755 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2756
2757 if (GOT_TLS_GD_P (tls_type))
2758 {
2759 if (indx == 0)
2760 {
2761 BFD_ASSERT (! unresolved_reloc);
2762 bfd_put_64 (output_bfd,
2763 relocation - dtpoff_base (info),
2764 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2765 }
2766 else
2767 {
2768 bfd_put_64 (output_bfd, 0,
2769 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2770 outrel.r_info = ELF64_R_INFO (indx,
2771 R_X86_64_DTPOFF64);
2772 outrel.r_offset += GOT_ENTRY_SIZE;
2773 sreloc->reloc_count++;
2774 loc += sizeof (Elf64_External_Rela);
2775 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
2776 <= sreloc->contents + sreloc->size);
2777 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2778 }
2779 }
2780
2781 dr_done:
2782 if (h != NULL)
2783 h->got.offset |= 1;
2784 else
2785 local_got_offsets[r_symndx] |= 1;
2786 }
2787
2788 if (off >= (bfd_vma) -2
2789 && ! GOT_TLS_GDESC_P (tls_type))
2790 abort ();
2791 if (r_type == ELF64_R_TYPE (rel->r_info))
2792 {
2793 if (r_type == R_X86_64_GOTPC32_TLSDESC
2794 || r_type == R_X86_64_TLSDESC_CALL)
2795 relocation = htab->sgotplt->output_section->vma
2796 + htab->sgotplt->output_offset
2797 + offplt + htab->sgotplt_jump_table_size;
2798 else
2799 relocation = htab->sgot->output_section->vma
2800 + htab->sgot->output_offset + off;
2801 unresolved_reloc = FALSE;
2802 }
2803 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
2804 {
2805 unsigned int i;
2806 static unsigned char tlsgd[8]
2807 = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 };
2808
2809 /* GD->IE transition.
2810 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
2811 .word 0x6666; rex64; call __tls_get_addr@plt
2812 Change it into:
2813 movq %fs:0, %rax
2814 addq foo@gottpoff(%rip), %rax */
2815 BFD_ASSERT (rel->r_offset >= 4);
2816 for (i = 0; i < 4; i++)
2817 BFD_ASSERT (bfd_get_8 (input_bfd,
2818 contents + rel->r_offset - 4 + i)
2819 == tlsgd[i]);
2820 BFD_ASSERT (rel->r_offset + 12 <= input_section->size);
2821 for (i = 0; i < 4; i++)
2822 BFD_ASSERT (bfd_get_8 (input_bfd,
2823 contents + rel->r_offset + 4 + i)
2824 == tlsgd[i+4]);
2825 BFD_ASSERT (rel + 1 < relend);
2826 BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
2827 memcpy (contents + rel->r_offset - 4,
2828 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
2829 16);
2830
2831 relocation = (htab->sgot->output_section->vma
2832 + htab->sgot->output_offset + off
2833 - rel->r_offset
2834 - input_section->output_section->vma
2835 - input_section->output_offset
2836 - 12);
2837 bfd_put_32 (output_bfd, relocation,
2838 contents + rel->r_offset + 8);
2839 /* Skip R_X86_64_PLT32. */
2840 rel++;
2841 continue;
2842 }
2843 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
2844 {
2845 /* GDesc -> IE transition.
2846 It's originally something like:
2847 leaq x@tlsdesc(%rip), %rax
2848
2849 Change it to:
2850 movq x@gottpoff(%rip), %rax # before nop; nop
2851
2852 Registers other than %rax may be set up here. */
2853
2854 unsigned int val, type, type2;
2855 bfd_vma roff;
2856
2857 /* First, make sure it's a leaq adding rip to a 32-bit
2858 offset into any register, although it's probably
2859 almost always going to be rax. */
2860 roff = rel->r_offset;
2861 BFD_ASSERT (roff >= 3);
2862 type = bfd_get_8 (input_bfd, contents + roff - 3);
2863 BFD_ASSERT ((type & 0xfb) == 0x48);
2864 type2 = bfd_get_8 (input_bfd, contents + roff - 2);
2865 BFD_ASSERT (type2 == 0x8d);
2866 val = bfd_get_8 (input_bfd, contents + roff - 1);
2867 BFD_ASSERT ((val & 0xc7) == 0x05);
2868 BFD_ASSERT (roff + 4 <= input_section->size);
2869
2870 /* Now modify the instruction as appropriate. */
2871 /* To turn a leaq into a movq in the form we use it, it
2872 suffices to change the second byte from 0x8d to
2873 0x8b. */
2874 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
2875
2876 bfd_put_32 (output_bfd,
2877 htab->sgot->output_section->vma
2878 + htab->sgot->output_offset + off
2879 - rel->r_offset
2880 - input_section->output_section->vma
2881 - input_section->output_offset
2882 - 4,
2883 contents + roff);
2884 continue;
2885 }
2886 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
2887 {
2888 /* GDesc -> IE transition.
2889 It's originally:
2890 call *(%rax)
2891
2892 Change it to:
2893 nop; nop. */
2894
2895 unsigned int val, type;
2896 bfd_vma roff;
2897
2898 /* First, make sure it's a call *(%eax). */
2899 roff = rel->r_offset;
2900 BFD_ASSERT (roff + 2 <= input_section->size);
2901 type = bfd_get_8 (input_bfd, contents + roff);
2902 BFD_ASSERT (type == 0xff);
2903 val = bfd_get_8 (input_bfd, contents + roff + 1);
2904 BFD_ASSERT (val == 0x10);
2905
2906 /* Now modify the instruction as appropriate. Use
2907 xchg %ax,%ax instead of 2 nops. */
2908 bfd_put_8 (output_bfd, 0x66, contents + roff);
2909 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2910
2911 continue;
2912 }
2913 else
2914 BFD_ASSERT (FALSE);
2915 break;
2916
2917 case R_X86_64_TLSLD:
2918 if (! info->shared)
2919 {
2920 /* LD->LE transition:
2921 Ensure it is:
2922 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr@plt.
2923 We change it into:
2924 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
2925 BFD_ASSERT (rel->r_offset >= 3);
2926 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 3)
2927 == 0x48);
2928 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2929 == 0x8d);
2930 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 1)
2931 == 0x3d);
2932 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2933 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2934 == 0xe8);
2935 BFD_ASSERT (rel + 1 < relend);
2936 BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
2937 memcpy (contents + rel->r_offset - 3,
2938 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
2939 /* Skip R_X86_64_PLT32. */
2940 rel++;
2941 continue;
2942 }
2943
2944 if (htab->sgot == NULL)
2945 abort ();
2946
2947 off = htab->tls_ld_got.offset;
2948 if (off & 1)
2949 off &= ~1;
2950 else
2951 {
2952 Elf_Internal_Rela outrel;
2953 bfd_byte *loc;
2954
2955 if (htab->srelgot == NULL)
2956 abort ();
2957
2958 outrel.r_offset = (htab->sgot->output_section->vma
2959 + htab->sgot->output_offset + off);
2960
2961 bfd_put_64 (output_bfd, 0,
2962 htab->sgot->contents + off);
2963 bfd_put_64 (output_bfd, 0,
2964 htab->sgot->contents + off + GOT_ENTRY_SIZE);
2965 outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64);
2966 outrel.r_addend = 0;
2967 loc = htab->srelgot->contents;
2968 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
2969 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
2970 htab->tls_ld_got.offset |= 1;
2971 }
2972 relocation = htab->sgot->output_section->vma
2973 + htab->sgot->output_offset + off;
2974 unresolved_reloc = FALSE;
2975 break;
2976
2977 case R_X86_64_DTPOFF32:
2978 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2979 relocation -= dtpoff_base (info);
2980 else
2981 relocation = tpoff (info, relocation);
2982 break;
2983
2984 case R_X86_64_TPOFF32:
2985 BFD_ASSERT (! info->shared);
2986 relocation = tpoff (info, relocation);
2987 break;
2988
2989 default:
2990 break;
2991 }
2992
2993 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2994 because such sections are not SEC_ALLOC and thus ld.so will
2995 not process them. */
2996 if (unresolved_reloc
2997 && !((input_section->flags & SEC_DEBUGGING) != 0
2998 && h->def_dynamic))
2999 (*_bfd_error_handler)
3000 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3001 input_bfd,
3002 input_section,
3003 (long) rel->r_offset,
3004 howto->name,
3005 h->root.root.string);
3006
3007 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3008 contents, rel->r_offset,
3009 relocation, rel->r_addend);
3010
3011 if (r != bfd_reloc_ok)
3012 {
3013 const char *name;
3014
3015 if (h != NULL)
3016 name = h->root.root.string;
3017 else
3018 {
3019 name = bfd_elf_string_from_elf_section (input_bfd,
3020 symtab_hdr->sh_link,
3021 sym->st_name);
3022 if (name == NULL)
3023 return FALSE;
3024 if (*name == '\0')
3025 name = bfd_section_name (input_bfd, sec);
3026 }
3027
3028 if (r == bfd_reloc_overflow)
3029 {
3030 if (! ((*info->callbacks->reloc_overflow)
3031 (info, (h ? &h->root : NULL), name, howto->name,
3032 (bfd_vma) 0, input_bfd, input_section,
3033 rel->r_offset)))
3034 return FALSE;
3035 }
3036 else
3037 {
3038 (*_bfd_error_handler)
3039 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3040 input_bfd, input_section,
3041 (long) rel->r_offset, name, (int) r);
3042 return FALSE;
3043 }
3044 }
3045 }
3046
3047 return TRUE;
3048 }
3049
3050 /* Finish up dynamic symbol handling. We set the contents of various
3051 dynamic sections here. */
3052
3053 static bfd_boolean
3054 elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd,
3055 struct bfd_link_info *info,
3056 struct elf_link_hash_entry *h,
3057 Elf_Internal_Sym *sym)
3058 {
3059 struct elf64_x86_64_link_hash_table *htab;
3060
3061 htab = elf64_x86_64_hash_table (info);
3062
3063 if (h->plt.offset != (bfd_vma) -1)
3064 {
3065 bfd_vma plt_index;
3066 bfd_vma got_offset;
3067 Elf_Internal_Rela rela;
3068 bfd_byte *loc;
3069
3070 /* This symbol has an entry in the procedure linkage table. Set
3071 it up. */
3072 if (h->dynindx == -1
3073 || htab->splt == NULL
3074 || htab->sgotplt == NULL
3075 || htab->srelplt == NULL)
3076 abort ();
3077
3078 /* Get the index in the procedure linkage table which
3079 corresponds to this symbol. This is the index of this symbol
3080 in all the symbols for which we are making plt entries. The
3081 first entry in the procedure linkage table is reserved. */
3082 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3083
3084 /* Get the offset into the .got table of the entry that
3085 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3086 bytes. The first three are reserved for the dynamic linker. */
3087 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3088
3089 /* Fill in the entry in the procedure linkage table. */
3090 memcpy (htab->splt->contents + h->plt.offset, elf64_x86_64_plt_entry,
3091 PLT_ENTRY_SIZE);
3092
3093 /* Insert the relocation positions of the plt section. The magic
3094 numbers at the end of the statements are the positions of the
3095 relocations in the plt section. */
3096 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3097 instruction uses 6 bytes, subtract this value. */
3098 bfd_put_32 (output_bfd,
3099 (htab->sgotplt->output_section->vma
3100 + htab->sgotplt->output_offset
3101 + got_offset
3102 - htab->splt->output_section->vma
3103 - htab->splt->output_offset
3104 - h->plt.offset
3105 - 6),
3106 htab->splt->contents + h->plt.offset + 2);
3107 /* Put relocation index. */
3108 bfd_put_32 (output_bfd, plt_index,
3109 htab->splt->contents + h->plt.offset + 7);
3110 /* Put offset for jmp .PLT0. */
3111 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3112 htab->splt->contents + h->plt.offset + 12);
3113
3114 /* Fill in the entry in the global offset table, initially this
3115 points to the pushq instruction in the PLT which is at offset 6. */
3116 bfd_put_64 (output_bfd, (htab->splt->output_section->vma
3117 + htab->splt->output_offset
3118 + h->plt.offset + 6),
3119 htab->sgotplt->contents + got_offset);
3120
3121 /* Fill in the entry in the .rela.plt section. */
3122 rela.r_offset = (htab->sgotplt->output_section->vma
3123 + htab->sgotplt->output_offset
3124 + got_offset);
3125 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
3126 rela.r_addend = 0;
3127 loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
3128 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3129
3130 if (!h->def_regular)
3131 {
3132 /* Mark the symbol as undefined, rather than as defined in
3133 the .plt section. Leave the value if there were any
3134 relocations where pointer equality matters (this is a clue
3135 for the dynamic linker, to make function pointer
3136 comparisons work between an application and shared
3137 library), otherwise set it to zero. If a function is only
3138 called from a binary, there is no need to slow down
3139 shared libraries because of that. */
3140 sym->st_shndx = SHN_UNDEF;
3141 if (!h->pointer_equality_needed)
3142 sym->st_value = 0;
3143 }
3144 }
3145
3146 if (h->got.offset != (bfd_vma) -1
3147 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type)
3148 && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
3149 {
3150 Elf_Internal_Rela rela;
3151 bfd_byte *loc;
3152
3153 /* This symbol has an entry in the global offset table. Set it
3154 up. */
3155 if (htab->sgot == NULL || htab->srelgot == NULL)
3156 abort ();
3157
3158 rela.r_offset = (htab->sgot->output_section->vma
3159 + htab->sgot->output_offset
3160 + (h->got.offset &~ (bfd_vma) 1));
3161
3162 /* If this is a static link, or it is a -Bsymbolic link and the
3163 symbol is defined locally or was forced to be local because
3164 of a version file, we just want to emit a RELATIVE reloc.
3165 The entry in the global offset table will already have been
3166 initialized in the relocate_section function. */
3167 if (info->shared
3168 && SYMBOL_REFERENCES_LOCAL (info, h))
3169 {
3170 BFD_ASSERT((h->got.offset & 1) != 0);
3171 rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3172 rela.r_addend = (h->root.u.def.value
3173 + h->root.u.def.section->output_section->vma
3174 + h->root.u.def.section->output_offset);
3175 }
3176 else
3177 {
3178 BFD_ASSERT((h->got.offset & 1) == 0);
3179 bfd_put_64 (output_bfd, (bfd_vma) 0,
3180 htab->sgot->contents + h->got.offset);
3181 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT);
3182 rela.r_addend = 0;
3183 }
3184
3185 loc = htab->srelgot->contents;
3186 loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
3187 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3188 }
3189
3190 if (h->needs_copy)
3191 {
3192 Elf_Internal_Rela rela;
3193 bfd_byte *loc;
3194
3195 /* This symbol needs a copy reloc. Set it up. */
3196
3197 if (h->dynindx == -1
3198 || (h->root.type != bfd_link_hash_defined
3199 && h->root.type != bfd_link_hash_defweak)
3200 || htab->srelbss == NULL)
3201 abort ();
3202
3203 rela.r_offset = (h->root.u.def.value
3204 + h->root.u.def.section->output_section->vma
3205 + h->root.u.def.section->output_offset);
3206 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
3207 rela.r_addend = 0;
3208 loc = htab->srelbss->contents;
3209 loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
3210 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3211 }
3212
3213 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3214 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3215 || h == htab->elf.hgot)
3216 sym->st_shndx = SHN_ABS;
3217
3218 return TRUE;
3219 }
3220
3221 /* Used to decide how to sort relocs in an optimal manner for the
3222 dynamic linker, before writing them out. */
3223
3224 static enum elf_reloc_type_class
3225 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
3226 {
3227 switch ((int) ELF64_R_TYPE (rela->r_info))
3228 {
3229 case R_X86_64_RELATIVE:
3230 return reloc_class_relative;
3231 case R_X86_64_JUMP_SLOT:
3232 return reloc_class_plt;
3233 case R_X86_64_COPY:
3234 return reloc_class_copy;
3235 default:
3236 return reloc_class_normal;
3237 }
3238 }
3239
3240 /* Finish up the dynamic sections. */
3241
3242 static bfd_boolean
3243 elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3244 {
3245 struct elf64_x86_64_link_hash_table *htab;
3246 bfd *dynobj;
3247 asection *sdyn;
3248
3249 htab = elf64_x86_64_hash_table (info);
3250 dynobj = htab->elf.dynobj;
3251 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3252
3253 if (htab->elf.dynamic_sections_created)
3254 {
3255 Elf64_External_Dyn *dyncon, *dynconend;
3256
3257 if (sdyn == NULL || htab->sgot == NULL)
3258 abort ();
3259
3260 dyncon = (Elf64_External_Dyn *) sdyn->contents;
3261 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
3262 for (; dyncon < dynconend; dyncon++)
3263 {
3264 Elf_Internal_Dyn dyn;
3265 asection *s;
3266
3267 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
3268
3269 switch (dyn.d_tag)
3270 {
3271 default:
3272 continue;
3273
3274 case DT_PLTGOT:
3275 s = htab->sgotplt;
3276 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3277 break;
3278
3279 case DT_JMPREL:
3280 dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
3281 break;
3282
3283 case DT_PLTRELSZ:
3284 s = htab->srelplt->output_section;
3285 dyn.d_un.d_val = s->size;
3286 break;
3287
3288 case DT_RELASZ:
3289 /* The procedure linkage table relocs (DT_JMPREL) should
3290 not be included in the overall relocs (DT_RELA).
3291 Therefore, we override the DT_RELASZ entry here to
3292 make it not include the JMPREL relocs. Since the
3293 linker script arranges for .rela.plt to follow all
3294 other relocation sections, we don't have to worry
3295 about changing the DT_RELA entry. */
3296 if (htab->srelplt != NULL)
3297 {
3298 s = htab->srelplt->output_section;
3299 dyn.d_un.d_val -= s->size;
3300 }
3301 break;
3302
3303 case DT_TLSDESC_PLT:
3304 s = htab->splt;
3305 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
3306 + htab->tlsdesc_plt;
3307 break;
3308
3309 case DT_TLSDESC_GOT:
3310 s = htab->sgot;
3311 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
3312 + htab->tlsdesc_got;
3313 break;
3314 }
3315
3316 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
3317 }
3318
3319 /* Fill in the special first entry in the procedure linkage table. */
3320 if (htab->splt && htab->splt->size > 0)
3321 {
3322 /* Fill in the first entry in the procedure linkage table. */
3323 memcpy (htab->splt->contents, elf64_x86_64_plt0_entry,
3324 PLT_ENTRY_SIZE);
3325 /* Add offset for pushq GOT+8(%rip), since the instruction
3326 uses 6 bytes subtract this value. */
3327 bfd_put_32 (output_bfd,
3328 (htab->sgotplt->output_section->vma
3329 + htab->sgotplt->output_offset
3330 + 8
3331 - htab->splt->output_section->vma
3332 - htab->splt->output_offset
3333 - 6),
3334 htab->splt->contents + 2);
3335 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
3336 the end of the instruction. */
3337 bfd_put_32 (output_bfd,
3338 (htab->sgotplt->output_section->vma
3339 + htab->sgotplt->output_offset
3340 + 16
3341 - htab->splt->output_section->vma
3342 - htab->splt->output_offset
3343 - 12),
3344 htab->splt->contents + 8);
3345
3346 elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize =
3347 PLT_ENTRY_SIZE;
3348
3349 if (htab->tlsdesc_plt)
3350 {
3351 bfd_put_64 (output_bfd, (bfd_vma) 0,
3352 htab->sgot->contents + htab->tlsdesc_got);
3353
3354 memcpy (htab->splt->contents + htab->tlsdesc_plt,
3355 elf64_x86_64_plt0_entry,
3356 PLT_ENTRY_SIZE);
3357
3358 /* Add offset for pushq GOT+8(%rip), since the
3359 instruction uses 6 bytes subtract this value. */
3360 bfd_put_32 (output_bfd,
3361 (htab->sgotplt->output_section->vma
3362 + htab->sgotplt->output_offset
3363 + 8
3364 - htab->splt->output_section->vma
3365 - htab->splt->output_offset
3366 - htab->tlsdesc_plt
3367 - 6),
3368 htab->splt->contents + htab->tlsdesc_plt + 2);
3369 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
3370 htab->tlsdesc_got. The 12 is the offset to the end of
3371 the instruction. */
3372 bfd_put_32 (output_bfd,
3373 (htab->sgot->output_section->vma
3374 + htab->sgot->output_offset
3375 + htab->tlsdesc_got
3376 - htab->splt->output_section->vma
3377 - htab->splt->output_offset
3378 - htab->tlsdesc_plt
3379 - 12),
3380 htab->splt->contents + htab->tlsdesc_plt + 8);
3381 }
3382 }
3383 }
3384
3385 if (htab->sgotplt)
3386 {
3387 /* Fill in the first three entries in the global offset table. */
3388 if (htab->sgotplt->size > 0)
3389 {
3390 /* Set the first entry in the global offset table to the address of
3391 the dynamic section. */
3392 if (sdyn == NULL)
3393 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents);
3394 else
3395 bfd_put_64 (output_bfd,
3396 sdyn->output_section->vma + sdyn->output_offset,
3397 htab->sgotplt->contents);
3398 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
3399 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE);
3400 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2);
3401 }
3402
3403 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize =
3404 GOT_ENTRY_SIZE;
3405 }
3406
3407 if (htab->sgot && htab->sgot->size > 0)
3408 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize
3409 = GOT_ENTRY_SIZE;
3410
3411 return TRUE;
3412 }
3413
3414 /* Return address for Ith PLT stub in section PLT, for relocation REL
3415 or (bfd_vma) -1 if it should not be included. */
3416
3417 static bfd_vma
3418 elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
3419 const arelent *rel ATTRIBUTE_UNUSED)
3420 {
3421 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
3422 }
3423
3424 /* Handle an x86-64 specific section when reading an object file. This
3425 is called when elfcode.h finds a section with an unknown type. */
3426
3427 static bfd_boolean
3428 elf64_x86_64_section_from_shdr (bfd *abfd,
3429 Elf_Internal_Shdr *hdr,
3430 const char *name,
3431 int shindex)
3432 {
3433 if (hdr->sh_type != SHT_X86_64_UNWIND)
3434 return FALSE;
3435
3436 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
3437 return FALSE;
3438
3439 return TRUE;
3440 }
3441
3442 /* Hook called by the linker routine which adds symbols from an object
3443 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
3444 of .bss. */
3445
3446 static bfd_boolean
3447 elf64_x86_64_add_symbol_hook (bfd *abfd,
3448 struct bfd_link_info *info ATTRIBUTE_UNUSED,
3449 Elf_Internal_Sym *sym,
3450 const char **namep ATTRIBUTE_UNUSED,
3451 flagword *flagsp ATTRIBUTE_UNUSED,
3452 asection **secp, bfd_vma *valp)
3453 {
3454 asection *lcomm;
3455
3456 switch (sym->st_shndx)
3457 {
3458 case SHN_X86_64_LCOMMON:
3459 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
3460 if (lcomm == NULL)
3461 {
3462 lcomm = bfd_make_section_with_flags (abfd,
3463 "LARGE_COMMON",
3464 (SEC_ALLOC
3465 | SEC_IS_COMMON
3466 | SEC_LINKER_CREATED));
3467 if (lcomm == NULL)
3468 return FALSE;
3469 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
3470 }
3471 *secp = lcomm;
3472 *valp = sym->st_size;
3473 break;
3474 }
3475 return TRUE;
3476 }
3477
3478
3479 /* Given a BFD section, try to locate the corresponding ELF section
3480 index. */
3481
3482 static bfd_boolean
3483 elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
3484 asection *sec, int *index)
3485 {
3486 if (sec == &_bfd_elf_large_com_section)
3487 {
3488 *index = SHN_X86_64_LCOMMON;
3489 return TRUE;
3490 }
3491 return FALSE;
3492 }
3493
3494 /* Process a symbol. */
3495
3496 static void
3497 elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
3498 asymbol *asym)
3499 {
3500 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
3501
3502 switch (elfsym->internal_elf_sym.st_shndx)
3503 {
3504 case SHN_X86_64_LCOMMON:
3505 asym->section = &_bfd_elf_large_com_section;
3506 asym->value = elfsym->internal_elf_sym.st_size;
3507 /* Common symbol doesn't set BSF_GLOBAL. */
3508 asym->flags &= ~BSF_GLOBAL;
3509 break;
3510 }
3511 }
3512
3513 static bfd_boolean
3514 elf64_x86_64_common_definition (Elf_Internal_Sym *sym)
3515 {
3516 return (sym->st_shndx == SHN_COMMON
3517 || sym->st_shndx == SHN_X86_64_LCOMMON);
3518 }
3519
3520 static unsigned int
3521 elf64_x86_64_common_section_index (asection *sec)
3522 {
3523 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
3524 return SHN_COMMON;
3525 else
3526 return SHN_X86_64_LCOMMON;
3527 }
3528
3529 static asection *
3530 elf64_x86_64_common_section (asection *sec)
3531 {
3532 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
3533 return bfd_com_section_ptr;
3534 else
3535 return &_bfd_elf_large_com_section;
3536 }
3537
3538 static bfd_boolean
3539 elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
3540 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
3541 struct elf_link_hash_entry *h,
3542 Elf_Internal_Sym *sym,
3543 asection **psec,
3544 bfd_vma *pvalue ATTRIBUTE_UNUSED,
3545 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
3546 bfd_boolean *skip ATTRIBUTE_UNUSED,
3547 bfd_boolean *override ATTRIBUTE_UNUSED,
3548 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
3549 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
3550 bfd_boolean *newdef ATTRIBUTE_UNUSED,
3551 bfd_boolean *newdyn,
3552 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
3553 bfd_boolean *newweak ATTRIBUTE_UNUSED,
3554 bfd *abfd ATTRIBUTE_UNUSED,
3555 asection **sec,
3556 bfd_boolean *olddef ATTRIBUTE_UNUSED,
3557 bfd_boolean *olddyn,
3558 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
3559 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
3560 bfd *oldbfd,
3561 asection **oldsec)
3562 {
3563 /* A normal common symbol and a large common symbol result in a
3564 normal common symbol. We turn the large common symbol into a
3565 normal one. */
3566 if (!*olddyn
3567 && h->root.type == bfd_link_hash_common
3568 && !*newdyn
3569 && bfd_is_com_section (*sec)
3570 && *oldsec != *sec)
3571 {
3572 if (sym->st_shndx == SHN_COMMON
3573 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
3574 {
3575 h->root.u.c.p->section
3576 = bfd_make_section_old_way (oldbfd, "COMMON");
3577 h->root.u.c.p->section->flags = SEC_ALLOC;
3578 }
3579 else if (sym->st_shndx == SHN_X86_64_LCOMMON
3580 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
3581 *psec = *sec = bfd_com_section_ptr;
3582 }
3583
3584 return TRUE;
3585 }
3586
3587 static int
3588 elf64_x86_64_additional_program_headers (bfd *abfd,
3589 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3590 {
3591 asection *s;
3592 int count = 0;
3593
3594 /* Check to see if we need a large readonly segment. */
3595 s = bfd_get_section_by_name (abfd, ".lrodata");
3596 if (s && (s->flags & SEC_LOAD))
3597 count++;
3598
3599 /* Check to see if we need a large data segment. Since .lbss sections
3600 is placed right after the .bss section, there should be no need for
3601 a large data segment just because of .lbss. */
3602 s = bfd_get_section_by_name (abfd, ".ldata");
3603 if (s && (s->flags & SEC_LOAD))
3604 count++;
3605
3606 return count;
3607 }
3608
3609 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
3610
3611 static bfd_boolean
3612 elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h)
3613 {
3614 if (h->plt.offset != (bfd_vma) -1
3615 && !h->def_regular
3616 && !h->pointer_equality_needed)
3617 return FALSE;
3618
3619 return _bfd_elf_hash_symbol (h);
3620 }
3621
3622 static const struct bfd_elf_special_section
3623 elf64_x86_64_special_sections[]=
3624 {
3625 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
3626 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
3627 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
3628 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
3629 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
3630 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
3631 { NULL, 0, 0, 0, 0 }
3632 };
3633
3634 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
3635 #define TARGET_LITTLE_NAME "elf64-x86-64"
3636 #define ELF_ARCH bfd_arch_i386
3637 #define ELF_MACHINE_CODE EM_X86_64
3638 #define ELF_MAXPAGESIZE 0x200000
3639 #define ELF_MINPAGESIZE 0x1000
3640 #define ELF_COMMONPAGESIZE 0x1000
3641
3642 #define elf_backend_can_gc_sections 1
3643 #define elf_backend_can_refcount 1
3644 #define elf_backend_want_got_plt 1
3645 #define elf_backend_plt_readonly 1
3646 #define elf_backend_want_plt_sym 0
3647 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
3648 #define elf_backend_rela_normal 1
3649
3650 #define elf_info_to_howto elf64_x86_64_info_to_howto
3651
3652 #define bfd_elf64_bfd_link_hash_table_create \
3653 elf64_x86_64_link_hash_table_create
3654 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
3655
3656 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
3657 #define elf_backend_check_relocs elf64_x86_64_check_relocs
3658 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
3659 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
3660 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
3661 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
3662 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
3663 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
3664 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
3665 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
3666 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
3667 #define elf_backend_relocate_section elf64_x86_64_relocate_section
3668 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
3669 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
3670 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
3671 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
3672 #define elf_backend_object_p elf64_x86_64_elf_object_p
3673 #define bfd_elf64_mkobject elf64_x86_64_mkobject
3674
3675 #define elf_backend_section_from_shdr \
3676 elf64_x86_64_section_from_shdr
3677
3678 #define elf_backend_section_from_bfd_section \
3679 elf64_x86_64_elf_section_from_bfd_section
3680 #define elf_backend_add_symbol_hook \
3681 elf64_x86_64_add_symbol_hook
3682 #define elf_backend_symbol_processing \
3683 elf64_x86_64_symbol_processing
3684 #define elf_backend_common_section_index \
3685 elf64_x86_64_common_section_index
3686 #define elf_backend_common_section \
3687 elf64_x86_64_common_section
3688 #define elf_backend_common_definition \
3689 elf64_x86_64_common_definition
3690 #define elf_backend_merge_symbol \
3691 elf64_x86_64_merge_symbol
3692 #define elf_backend_special_sections \
3693 elf64_x86_64_special_sections
3694 #define elf_backend_additional_program_headers \
3695 elf64_x86_64_additional_program_headers
3696 #define elf_backend_hash_symbol \
3697 elf64_x86_64_hash_symbol
3698
3699 #include "elf64-target.h"
3700
3701 /* FreeBSD support. */
3702
3703 #undef TARGET_LITTLE_SYM
3704 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
3705 #undef TARGET_LITTLE_NAME
3706 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
3707
3708 /* The kernel recognizes executables as valid only if they carry a
3709 "FreeBSD" label in the ELF header. So we put this label on all
3710 executables and (for simplicity) also all other object files. */
3711
3712 static void
3713 elf64_x86_64_fbsd_post_process_headers (bfd * abfd,
3714 struct bfd_link_info * link_info ATTRIBUTE_UNUSED)
3715 {
3716 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */
3717
3718 i_ehdrp = elf_elfheader (abfd);
3719
3720 /* Put an ABI label supported by FreeBSD >= 4.1. */
3721 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3722 }
3723
3724 #undef elf_backend_post_process_headers
3725 #define elf_backend_post_process_headers elf64_x86_64_fbsd_post_process_headers
3726
3727 #undef elf64_bed
3728 #define elf64_bed elf64_x86_64_fbsd_bed
3729
3730 #include "elf64-target.h"
The GNU Binutils are a collection of binary tools.