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* plugin.c (is_visible_from_outside): New function.
[binutils.git] / bfd / elf64-x86-64.c
blob83656aead16327b6f49746ee9c3341b78ed3443a
1 /* X86-64 specific support for 64-bit ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2010 Free Software Foundation, Inc.
4 Contributed by Jan Hubicka <jh@suse.cz>.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31
32 #include "elf/x86-64.h"
33
34 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
35 #define MINUS_ONE (~ (bfd_vma) 0)
36
37 /* The relocation "howto" table. Order of fields:
38 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
39 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
40 static reloc_howto_type x86_64_elf_howto_table[] =
41 {
42 HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
43 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
44 FALSE),
45 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
47 FALSE),
48 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
49 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
50 TRUE),
51 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
52 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
53 FALSE),
54 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
55 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
56 TRUE),
57 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
59 FALSE),
60 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
62 MINUS_ONE, FALSE),
63 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
65 MINUS_ONE, FALSE),
66 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
68 MINUS_ONE, FALSE),
69 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
70 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
71 0xffffffff, TRUE),
72 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
73 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
74 FALSE),
75 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
76 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
77 FALSE),
78 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
80 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
81 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
82 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
84 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
85 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
86 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
88 MINUS_ONE, FALSE),
89 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
91 MINUS_ONE, FALSE),
92 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
94 MINUS_ONE, FALSE),
95 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
96 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
97 0xffffffff, TRUE),
98 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
99 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
100 0xffffffff, TRUE),
101 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
102 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
103 0xffffffff, FALSE),
104 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
105 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
106 0xffffffff, TRUE),
107 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
108 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
109 0xffffffff, FALSE),
110 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
112 TRUE),
113 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
115 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
116 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
117 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
118 FALSE, 0xffffffff, 0xffffffff, TRUE),
119 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
120 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
121 FALSE),
122 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
123 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
124 MINUS_ONE, TRUE),
125 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
126 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
127 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
128 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
129 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
130 MINUS_ONE, FALSE),
131 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
132 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
133 MINUS_ONE, FALSE),
134 EMPTY_HOWTO (32),
135 EMPTY_HOWTO (33),
136 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
137 complain_overflow_bitfield, bfd_elf_generic_reloc,
138 "R_X86_64_GOTPC32_TLSDESC",
139 FALSE, 0xffffffff, 0xffffffff, TRUE),
140 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
141 complain_overflow_dont, bfd_elf_generic_reloc,
142 "R_X86_64_TLSDESC_CALL",
143 FALSE, 0, 0, FALSE),
144 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
145 complain_overflow_bitfield, bfd_elf_generic_reloc,
146 "R_X86_64_TLSDESC",
147 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
148 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
150 MINUS_ONE, FALSE),
151
152 /* We have a gap in the reloc numbers here.
153 R_X86_64_standard counts the number up to this point, and
154 R_X86_64_vt_offset is the value to subtract from a reloc type of
155 R_X86_64_GNU_VT* to form an index into this table. */
156 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
157 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
158
159 /* GNU extension to record C++ vtable hierarchy. */
160 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
161 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
162
163 /* GNU extension to record C++ vtable member usage. */
164 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
165 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
166 FALSE)
167 };
168
169 #define IS_X86_64_PCREL_TYPE(TYPE) \
170 ( ((TYPE) == R_X86_64_PC8) \
171 || ((TYPE) == R_X86_64_PC16) \
172 || ((TYPE) == R_X86_64_PC32) \
173 || ((TYPE) == R_X86_64_PC64))
174
175 /* Map BFD relocs to the x86_64 elf relocs. */
176 struct elf_reloc_map
177 {
178 bfd_reloc_code_real_type bfd_reloc_val;
179 unsigned char elf_reloc_val;
180 };
181
182 static const struct elf_reloc_map x86_64_reloc_map[] =
183 {
184 { BFD_RELOC_NONE, R_X86_64_NONE, },
185 { BFD_RELOC_64, R_X86_64_64, },
186 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
187 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
188 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
189 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
190 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
191 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
192 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
193 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
194 { BFD_RELOC_32, R_X86_64_32, },
195 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
196 { BFD_RELOC_16, R_X86_64_16, },
197 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
198 { BFD_RELOC_8, R_X86_64_8, },
199 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
200 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
201 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
202 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
203 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
204 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
205 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
206 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
207 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
208 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
209 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
210 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
211 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
212 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
213 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
214 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
215 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
216 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
217 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
218 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
219 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
220 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
221 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
222 };
223
224 static reloc_howto_type *
225 elf64_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
226 {
227 unsigned i;
228
229 if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
230 || r_type >= (unsigned int) R_X86_64_max)
231 {
232 if (r_type >= (unsigned int) R_X86_64_standard)
233 {
234 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
235 abfd, (int) r_type);
236 r_type = R_X86_64_NONE;
237 }
238 i = r_type;
239 }
240 else
241 i = r_type - (unsigned int) R_X86_64_vt_offset;
242 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
243 return &x86_64_elf_howto_table[i];
244 }
245
246 /* Given a BFD reloc type, return a HOWTO structure. */
247 static reloc_howto_type *
248 elf64_x86_64_reloc_type_lookup (bfd *abfd,
249 bfd_reloc_code_real_type code)
250 {
251 unsigned int i;
252
253 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
254 i++)
255 {
256 if (x86_64_reloc_map[i].bfd_reloc_val == code)
257 return elf64_x86_64_rtype_to_howto (abfd,
258 x86_64_reloc_map[i].elf_reloc_val);
259 }
260 return 0;
261 }
262
263 static reloc_howto_type *
264 elf64_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
265 const char *r_name)
266 {
267 unsigned int i;
268
269 for (i = 0;
270 i < (sizeof (x86_64_elf_howto_table)
271 / sizeof (x86_64_elf_howto_table[0]));
272 i++)
273 if (x86_64_elf_howto_table[i].name != NULL
274 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
275 return &x86_64_elf_howto_table[i];
276
277 return NULL;
278 }
279
280 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
281
282 static void
283 elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
284 Elf_Internal_Rela *dst)
285 {
286 unsigned r_type;
287
288 r_type = ELF64_R_TYPE (dst->r_info);
289 cache_ptr->howto = elf64_x86_64_rtype_to_howto (abfd, r_type);
290 BFD_ASSERT (r_type == cache_ptr->howto->type);
291 }
292 \f
293 /* Support for core dump NOTE sections. */
294 static bfd_boolean
295 elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
296 {
297 int offset;
298 size_t size;
299
300 switch (note->descsz)
301 {
302 default:
303 return FALSE;
304
305 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
306 /* pr_cursig */
307 elf_tdata (abfd)->core_signal
308 = bfd_get_16 (abfd, note->descdata + 12);
309
310 /* pr_pid */
311 elf_tdata (abfd)->core_lwpid
312 = bfd_get_32 (abfd, note->descdata + 32);
313
314 /* pr_reg */
315 offset = 112;
316 size = 216;
317
318 break;
319 }
320
321 /* Make a ".reg/999" section. */
322 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
323 size, note->descpos + offset);
324 }
325
326 static bfd_boolean
327 elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
328 {
329 switch (note->descsz)
330 {
331 default:
332 return FALSE;
333
334 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
335 elf_tdata (abfd)->core_pid
336 = bfd_get_32 (abfd, note->descdata + 24);
337 elf_tdata (abfd)->core_program
338 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
339 elf_tdata (abfd)->core_command
340 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
341 }
342
343 /* Note that for some reason, a spurious space is tacked
344 onto the end of the args in some (at least one anyway)
345 implementations, so strip it off if it exists. */
346
347 {
348 char *command = elf_tdata (abfd)->core_command;
349 int n = strlen (command);
350
351 if (0 < n && command[n - 1] == ' ')
352 command[n - 1] = '\0';
353 }
354
355 return TRUE;
356 }
357 \f
358 /* Functions for the x86-64 ELF linker. */
359
360 /* The name of the dynamic interpreter. This is put in the .interp
361 section. */
362
363 #define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
364
365 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
366 copying dynamic variables from a shared lib into an app's dynbss
367 section, and instead use a dynamic relocation to point into the
368 shared lib. */
369 #define ELIMINATE_COPY_RELOCS 1
370
371 /* The size in bytes of an entry in the global offset table. */
372
373 #define GOT_ENTRY_SIZE 8
374
375 /* The size in bytes of an entry in the procedure linkage table. */
376
377 #define PLT_ENTRY_SIZE 16
378
379 /* The first entry in a procedure linkage table looks like this. See the
380 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
381
382 static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
383 {
384 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
385 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
386 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
387 };
388
389 /* Subsequent entries in a procedure linkage table look like this. */
390
391 static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
392 {
393 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
394 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
395 0x68, /* pushq immediate */
396 0, 0, 0, 0, /* replaced with index into relocation table. */
397 0xe9, /* jmp relative */
398 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
399 };
400
401 /* x86-64 ELF linker hash entry. */
402
403 struct elf64_x86_64_link_hash_entry
404 {
405 struct elf_link_hash_entry elf;
406
407 /* Track dynamic relocs copied for this symbol. */
408 struct elf_dyn_relocs *dyn_relocs;
409
410 #define GOT_UNKNOWN 0
411 #define GOT_NORMAL 1
412 #define GOT_TLS_GD 2
413 #define GOT_TLS_IE 3
414 #define GOT_TLS_GDESC 4
415 #define GOT_TLS_GD_BOTH_P(type) \
416 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
417 #define GOT_TLS_GD_P(type) \
418 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
419 #define GOT_TLS_GDESC_P(type) \
420 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
421 #define GOT_TLS_GD_ANY_P(type) \
422 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
423 unsigned char tls_type;
424
425 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
426 starting at the end of the jump table. */
427 bfd_vma tlsdesc_got;
428 };
429
430 #define elf64_x86_64_hash_entry(ent) \
431 ((struct elf64_x86_64_link_hash_entry *)(ent))
432
433 struct elf64_x86_64_obj_tdata
434 {
435 struct elf_obj_tdata root;
436
437 /* tls_type for each local got entry. */
438 char *local_got_tls_type;
439
440 /* GOTPLT entries for TLS descriptors. */
441 bfd_vma *local_tlsdesc_gotent;
442 };
443
444 #define elf64_x86_64_tdata(abfd) \
445 ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
446
447 #define elf64_x86_64_local_got_tls_type(abfd) \
448 (elf64_x86_64_tdata (abfd)->local_got_tls_type)
449
450 #define elf64_x86_64_local_tlsdesc_gotent(abfd) \
451 (elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
452
453 #define is_x86_64_elf(bfd) \
454 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
455 && elf_tdata (bfd) != NULL \
456 && elf_object_id (bfd) == X86_64_ELF_DATA)
457
458 static bfd_boolean
459 elf64_x86_64_mkobject (bfd *abfd)
460 {
461 return bfd_elf_allocate_object (abfd, sizeof (struct elf64_x86_64_obj_tdata),
462 X86_64_ELF_DATA);
463 }
464
465 /* x86-64 ELF linker hash table. */
466
467 struct elf64_x86_64_link_hash_table
468 {
469 struct elf_link_hash_table elf;
470
471 /* Short-cuts to get to dynamic linker sections. */
472 asection *sdynbss;
473 asection *srelbss;
474
475 union
476 {
477 bfd_signed_vma refcount;
478 bfd_vma offset;
479 } tls_ld_got;
480
481 /* The amount of space used by the jump slots in the GOT. */
482 bfd_vma sgotplt_jump_table_size;
483
484 /* Small local sym cache. */
485 struct sym_cache sym_cache;
486
487 /* _TLS_MODULE_BASE_ symbol. */
488 struct bfd_link_hash_entry *tls_module_base;
489
490 /* Used by local STT_GNU_IFUNC symbols. */
491 htab_t loc_hash_table;
492 void * loc_hash_memory;
493
494 /* The offset into splt of the PLT entry for the TLS descriptor
495 resolver. Special values are 0, if not necessary (or not found
496 to be necessary yet), and -1 if needed but not determined
497 yet. */
498 bfd_vma tlsdesc_plt;
499 /* The offset into sgot of the GOT entry used by the PLT entry
500 above. */
501 bfd_vma tlsdesc_got;
502 };
503
504 /* Get the x86-64 ELF linker hash table from a link_info structure. */
505
506 #define elf64_x86_64_hash_table(p) \
507 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
508 == X86_64_ELF_DATA ? ((struct elf64_x86_64_link_hash_table *) ((p)->hash)) : NULL)
509
510 #define elf64_x86_64_compute_jump_table_size(htab) \
511 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
512
513 /* Create an entry in an x86-64 ELF linker hash table. */
514
515 static struct bfd_hash_entry *
516 elf64_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
517 struct bfd_hash_table *table,
518 const char *string)
519 {
520 /* Allocate the structure if it has not already been allocated by a
521 subclass. */
522 if (entry == NULL)
523 {
524 entry = (struct bfd_hash_entry *)
525 bfd_hash_allocate (table,
526 sizeof (struct elf64_x86_64_link_hash_entry));
527 if (entry == NULL)
528 return entry;
529 }
530
531 /* Call the allocation method of the superclass. */
532 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
533 if (entry != NULL)
534 {
535 struct elf64_x86_64_link_hash_entry *eh;
536
537 eh = (struct elf64_x86_64_link_hash_entry *) entry;
538 eh->dyn_relocs = NULL;
539 eh->tls_type = GOT_UNKNOWN;
540 eh->tlsdesc_got = (bfd_vma) -1;
541 }
542
543 return entry;
544 }
545
546 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
547 for local symbol so that we can handle local STT_GNU_IFUNC symbols
548 as global symbol. We reuse indx and dynstr_index for local symbol
549 hash since they aren't used by global symbols in this backend. */
550
551 static hashval_t
552 elf64_x86_64_local_htab_hash (const void *ptr)
553 {
554 struct elf_link_hash_entry *h
555 = (struct elf_link_hash_entry *) ptr;
556 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
557 }
558
559 /* Compare local hash entries. */
560
561 static int
562 elf64_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
563 {
564 struct elf_link_hash_entry *h1
565 = (struct elf_link_hash_entry *) ptr1;
566 struct elf_link_hash_entry *h2
567 = (struct elf_link_hash_entry *) ptr2;
568
569 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
570 }
571
572 /* Find and/or create a hash entry for local symbol. */
573
574 static struct elf_link_hash_entry *
575 elf64_x86_64_get_local_sym_hash (struct elf64_x86_64_link_hash_table *htab,
576 bfd *abfd, const Elf_Internal_Rela *rel,
577 bfd_boolean create)
578 {
579 struct elf64_x86_64_link_hash_entry e, *ret;
580 asection *sec = abfd->sections;
581 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
582 ELF64_R_SYM (rel->r_info));
583 void **slot;
584
585 e.elf.indx = sec->id;
586 e.elf.dynstr_index = ELF64_R_SYM (rel->r_info);
587 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
588 create ? INSERT : NO_INSERT);
589
590 if (!slot)
591 return NULL;
592
593 if (*slot)
594 {
595 ret = (struct elf64_x86_64_link_hash_entry *) *slot;
596 return &ret->elf;
597 }
598
599 ret = (struct elf64_x86_64_link_hash_entry *)
600 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
601 sizeof (struct elf64_x86_64_link_hash_entry));
602 if (ret)
603 {
604 memset (ret, 0, sizeof (*ret));
605 ret->elf.indx = sec->id;
606 ret->elf.dynstr_index = ELF64_R_SYM (rel->r_info);
607 ret->elf.dynindx = -1;
608 *slot = ret;
609 }
610 return &ret->elf;
611 }
612
613 /* Create an X86-64 ELF linker hash table. */
614
615 static struct bfd_link_hash_table *
616 elf64_x86_64_link_hash_table_create (bfd *abfd)
617 {
618 struct elf64_x86_64_link_hash_table *ret;
619 bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table);
620
621 ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt);
622 if (ret == NULL)
623 return NULL;
624
625 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
626 elf64_x86_64_link_hash_newfunc,
627 sizeof (struct elf64_x86_64_link_hash_entry),
628 X86_64_ELF_DATA))
629 {
630 free (ret);
631 return NULL;
632 }
633
634 ret->sdynbss = NULL;
635 ret->srelbss = NULL;
636 ret->sym_cache.abfd = NULL;
637 ret->tlsdesc_plt = 0;
638 ret->tlsdesc_got = 0;
639 ret->tls_ld_got.refcount = 0;
640 ret->sgotplt_jump_table_size = 0;
641 ret->tls_module_base = NULL;
642
643 ret->loc_hash_table = htab_try_create (1024,
644 elf64_x86_64_local_htab_hash,
645 elf64_x86_64_local_htab_eq,
646 NULL);
647 ret->loc_hash_memory = objalloc_create ();
648 if (!ret->loc_hash_table || !ret->loc_hash_memory)
649 {
650 free (ret);
651 return NULL;
652 }
653
654 return &ret->elf.root;
655 }
656
657 /* Destroy an X86-64 ELF linker hash table. */
658
659 static void
660 elf64_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash)
661 {
662 struct elf64_x86_64_link_hash_table *htab
663 = (struct elf64_x86_64_link_hash_table *) hash;
664
665 if (htab->loc_hash_table)
666 htab_delete (htab->loc_hash_table);
667 if (htab->loc_hash_memory)
668 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
669 _bfd_generic_link_hash_table_free (hash);
670 }
671
672 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
673 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
674 hash table. */
675
676 static bfd_boolean
677 elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
678 {
679 struct elf64_x86_64_link_hash_table *htab;
680
681 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
682 return FALSE;
683
684 htab = elf64_x86_64_hash_table (info);
685 if (htab == NULL)
686 return FALSE;
687
688 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
689 if (!info->shared)
690 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
691
692 if (!htab->sdynbss
693 || (!info->shared && !htab->srelbss))
694 abort ();
695
696 return TRUE;
697 }
698
699 /* Copy the extra info we tack onto an elf_link_hash_entry. */
700
701 static void
702 elf64_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
703 struct elf_link_hash_entry *dir,
704 struct elf_link_hash_entry *ind)
705 {
706 struct elf64_x86_64_link_hash_entry *edir, *eind;
707
708 edir = (struct elf64_x86_64_link_hash_entry *) dir;
709 eind = (struct elf64_x86_64_link_hash_entry *) ind;
710
711 if (eind->dyn_relocs != NULL)
712 {
713 if (edir->dyn_relocs != NULL)
714 {
715 struct elf_dyn_relocs **pp;
716 struct elf_dyn_relocs *p;
717
718 /* Add reloc counts against the indirect sym to the direct sym
719 list. Merge any entries against the same section. */
720 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
721 {
722 struct elf_dyn_relocs *q;
723
724 for (q = edir->dyn_relocs; q != NULL; q = q->next)
725 if (q->sec == p->sec)
726 {
727 q->pc_count += p->pc_count;
728 q->count += p->count;
729 *pp = p->next;
730 break;
731 }
732 if (q == NULL)
733 pp = &p->next;
734 }
735 *pp = edir->dyn_relocs;
736 }
737
738 edir->dyn_relocs = eind->dyn_relocs;
739 eind->dyn_relocs = NULL;
740 }
741
742 if (ind->root.type == bfd_link_hash_indirect
743 && dir->got.refcount <= 0)
744 {
745 edir->tls_type = eind->tls_type;
746 eind->tls_type = GOT_UNKNOWN;
747 }
748
749 if (ELIMINATE_COPY_RELOCS
750 && ind->root.type != bfd_link_hash_indirect
751 && dir->dynamic_adjusted)
752 {
753 /* If called to transfer flags for a weakdef during processing
754 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
755 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
756 dir->ref_dynamic |= ind->ref_dynamic;
757 dir->ref_regular |= ind->ref_regular;
758 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
759 dir->needs_plt |= ind->needs_plt;
760 dir->pointer_equality_needed |= ind->pointer_equality_needed;
761 }
762 else
763 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
764 }
765
766 static bfd_boolean
767 elf64_x86_64_elf_object_p (bfd *abfd)
768 {
769 /* Set the right machine number for an x86-64 elf64 file. */
770 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
771 return TRUE;
772 }
773
774 typedef union
775 {
776 unsigned char c[2];
777 uint16_t i;
778 }
779 x86_64_opcode16;
780
781 typedef union
782 {
783 unsigned char c[4];
784 uint32_t i;
785 }
786 x86_64_opcode32;
787
788 /* Return TRUE if the TLS access code sequence support transition
789 from R_TYPE. */
790
791 static bfd_boolean
792 elf64_x86_64_check_tls_transition (bfd *abfd, asection *sec,
793 bfd_byte *contents,
794 Elf_Internal_Shdr *symtab_hdr,
795 struct elf_link_hash_entry **sym_hashes,
796 unsigned int r_type,
797 const Elf_Internal_Rela *rel,
798 const Elf_Internal_Rela *relend)
799 {
800 unsigned int val;
801 unsigned long r_symndx;
802 struct elf_link_hash_entry *h;
803 bfd_vma offset;
804
805 /* Get the section contents. */
806 if (contents == NULL)
807 {
808 if (elf_section_data (sec)->this_hdr.contents != NULL)
809 contents = elf_section_data (sec)->this_hdr.contents;
810 else
811 {
812 /* FIXME: How to better handle error condition? */
813 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
814 return FALSE;
815
816 /* Cache the section contents for elf_link_input_bfd. */
817 elf_section_data (sec)->this_hdr.contents = contents;
818 }
819 }
820
821 offset = rel->r_offset;
822 switch (r_type)
823 {
824 case R_X86_64_TLSGD:
825 case R_X86_64_TLSLD:
826 if ((rel + 1) >= relend)
827 return FALSE;
828
829 if (r_type == R_X86_64_TLSGD)
830 {
831 /* Check transition from GD access model. Only
832 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
833 .word 0x6666; rex64; call __tls_get_addr
834 can transit to different access model. */
835
836 static x86_64_opcode32 leaq = { { 0x66, 0x48, 0x8d, 0x3d } },
837 call = { { 0x66, 0x66, 0x48, 0xe8 } };
838 if (offset < 4
839 || (offset + 12) > sec->size
840 || bfd_get_32 (abfd, contents + offset - 4) != leaq.i
841 || bfd_get_32 (abfd, contents + offset + 4) != call.i)
842 return FALSE;
843 }
844 else
845 {
846 /* Check transition from LD access model. Only
847 leaq foo@tlsld(%rip), %rdi;
848 call __tls_get_addr
849 can transit to different access model. */
850
851 static x86_64_opcode32 ld = { { 0x48, 0x8d, 0x3d, 0xe8 } };
852 x86_64_opcode32 op;
853
854 if (offset < 3 || (offset + 9) > sec->size)
855 return FALSE;
856
857 op.i = bfd_get_32 (abfd, contents + offset - 3);
858 op.c[3] = bfd_get_8 (abfd, contents + offset + 4);
859 if (op.i != ld.i)
860 return FALSE;
861 }
862
863 r_symndx = ELF64_R_SYM (rel[1].r_info);
864 if (r_symndx < symtab_hdr->sh_info)
865 return FALSE;
866
867 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
868 /* Use strncmp to check __tls_get_addr since __tls_get_addr
869 may be versioned. */
870 return (h != NULL
871 && h->root.root.string != NULL
872 && (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PC32
873 || ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
874 && (strncmp (h->root.root.string,
875 "__tls_get_addr", 14) == 0));
876
877 case R_X86_64_GOTTPOFF:
878 /* Check transition from IE access model:
879 movq foo@gottpoff(%rip), %reg
880 addq foo@gottpoff(%rip), %reg
881 */
882
883 if (offset < 3 || (offset + 4) > sec->size)
884 return FALSE;
885
886 val = bfd_get_8 (abfd, contents + offset - 3);
887 if (val != 0x48 && val != 0x4c)
888 return FALSE;
889
890 val = bfd_get_8 (abfd, contents + offset - 2);
891 if (val != 0x8b && val != 0x03)
892 return FALSE;
893
894 val = bfd_get_8 (abfd, contents + offset - 1);
895 return (val & 0xc7) == 5;
896
897 case R_X86_64_GOTPC32_TLSDESC:
898 /* Check transition from GDesc access model:
899 leaq x@tlsdesc(%rip), %rax
900
901 Make sure it's a leaq adding rip to a 32-bit offset
902 into any register, although it's probably almost always
903 going to be rax. */
904
905 if (offset < 3 || (offset + 4) > sec->size)
906 return FALSE;
907
908 val = bfd_get_8 (abfd, contents + offset - 3);
909 if ((val & 0xfb) != 0x48)
910 return FALSE;
911
912 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
913 return FALSE;
914
915 val = bfd_get_8 (abfd, contents + offset - 1);
916 return (val & 0xc7) == 0x05;
917
918 case R_X86_64_TLSDESC_CALL:
919 /* Check transition from GDesc access model:
920 call *x@tlsdesc(%rax)
921 */
922 if (offset + 2 <= sec->size)
923 {
924 /* Make sure that it's a call *x@tlsdesc(%rax). */
925 static x86_64_opcode16 call = { { 0xff, 0x10 } };
926 return bfd_get_16 (abfd, contents + offset) == call.i;
927 }
928
929 return FALSE;
930
931 default:
932 abort ();
933 }
934 }
935
936 /* Return TRUE if the TLS access transition is OK or no transition
937 will be performed. Update R_TYPE if there is a transition. */
938
939 static bfd_boolean
940 elf64_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
941 asection *sec, bfd_byte *contents,
942 Elf_Internal_Shdr *symtab_hdr,
943 struct elf_link_hash_entry **sym_hashes,
944 unsigned int *r_type, int tls_type,
945 const Elf_Internal_Rela *rel,
946 const Elf_Internal_Rela *relend,
947 struct elf_link_hash_entry *h,
948 unsigned long r_symndx)
949 {
950 unsigned int from_type = *r_type;
951 unsigned int to_type = from_type;
952 bfd_boolean check = TRUE;
953
954 /* Skip TLS transition for functions. */
955 if (h != NULL
956 && (h->type == STT_FUNC
957 || h->type == STT_GNU_IFUNC))
958 return TRUE;
959
960 switch (from_type)
961 {
962 case R_X86_64_TLSGD:
963 case R_X86_64_GOTPC32_TLSDESC:
964 case R_X86_64_TLSDESC_CALL:
965 case R_X86_64_GOTTPOFF:
966 if (info->executable)
967 {
968 if (h == NULL)
969 to_type = R_X86_64_TPOFF32;
970 else
971 to_type = R_X86_64_GOTTPOFF;
972 }
973
974 /* When we are called from elf64_x86_64_relocate_section,
975 CONTENTS isn't NULL and there may be additional transitions
976 based on TLS_TYPE. */
977 if (contents != NULL)
978 {
979 unsigned int new_to_type = to_type;
980
981 if (info->executable
982 && h != NULL
983 && h->dynindx == -1
984 && tls_type == GOT_TLS_IE)
985 new_to_type = R_X86_64_TPOFF32;
986
987 if (to_type == R_X86_64_TLSGD
988 || to_type == R_X86_64_GOTPC32_TLSDESC
989 || to_type == R_X86_64_TLSDESC_CALL)
990 {
991 if (tls_type == GOT_TLS_IE)
992 new_to_type = R_X86_64_GOTTPOFF;
993 }
994
995 /* We checked the transition before when we were called from
996 elf64_x86_64_check_relocs. We only want to check the new
997 transition which hasn't been checked before. */
998 check = new_to_type != to_type && from_type == to_type;
999 to_type = new_to_type;
1000 }
1001
1002 break;
1003
1004 case R_X86_64_TLSLD:
1005 if (info->executable)
1006 to_type = R_X86_64_TPOFF32;
1007 break;
1008
1009 default:
1010 return TRUE;
1011 }
1012
1013 /* Return TRUE if there is no transition. */
1014 if (from_type == to_type)
1015 return TRUE;
1016
1017 /* Check if the transition can be performed. */
1018 if (check
1019 && ! elf64_x86_64_check_tls_transition (abfd, sec, contents,
1020 symtab_hdr, sym_hashes,
1021 from_type, rel, relend))
1022 {
1023 reloc_howto_type *from, *to;
1024 const char *name;
1025
1026 from = elf64_x86_64_rtype_to_howto (abfd, from_type);
1027 to = elf64_x86_64_rtype_to_howto (abfd, to_type);
1028
1029 if (h)
1030 name = h->root.root.string;
1031 else
1032 {
1033 struct elf64_x86_64_link_hash_table *htab;
1034
1035 htab = elf64_x86_64_hash_table (info);
1036 if (htab == NULL)
1037 name = "*unknown*";
1038 else
1039 {
1040 Elf_Internal_Sym *isym;
1041
1042 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1043 abfd, r_symndx);
1044 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1045 }
1046 }
1047
1048 (*_bfd_error_handler)
1049 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1050 "in section `%A' failed"),
1051 abfd, sec, from->name, to->name, name,
1052 (unsigned long) rel->r_offset);
1053 bfd_set_error (bfd_error_bad_value);
1054 return FALSE;
1055 }
1056
1057 *r_type = to_type;
1058 return TRUE;
1059 }
1060
1061 /* Look through the relocs for a section during the first phase, and
1062 calculate needed space in the global offset table, procedure
1063 linkage table, and dynamic reloc sections. */
1064
1065 static bfd_boolean
1066 elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1067 asection *sec,
1068 const Elf_Internal_Rela *relocs)
1069 {
1070 struct elf64_x86_64_link_hash_table *htab;
1071 Elf_Internal_Shdr *symtab_hdr;
1072 struct elf_link_hash_entry **sym_hashes;
1073 const Elf_Internal_Rela *rel;
1074 const Elf_Internal_Rela *rel_end;
1075 asection *sreloc;
1076
1077 if (info->relocatable)
1078 return TRUE;
1079
1080 BFD_ASSERT (is_x86_64_elf (abfd));
1081
1082 htab = elf64_x86_64_hash_table (info);
1083 if (htab == NULL)
1084 return FALSE;
1085
1086 symtab_hdr = &elf_symtab_hdr (abfd);
1087 sym_hashes = elf_sym_hashes (abfd);
1088
1089 sreloc = NULL;
1090
1091 rel_end = relocs + sec->reloc_count;
1092 for (rel = relocs; rel < rel_end; rel++)
1093 {
1094 unsigned int r_type;
1095 unsigned long r_symndx;
1096 struct elf_link_hash_entry *h;
1097 Elf_Internal_Sym *isym;
1098 const char *name;
1099
1100 r_symndx = ELF64_R_SYM (rel->r_info);
1101 r_type = ELF64_R_TYPE (rel->r_info);
1102
1103 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1104 {
1105 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1106 abfd, r_symndx);
1107 return FALSE;
1108 }
1109
1110 if (r_symndx < symtab_hdr->sh_info)
1111 {
1112 /* A local symbol. */
1113 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1114 abfd, r_symndx);
1115 if (isym == NULL)
1116 return FALSE;
1117
1118 /* Check relocation against local STT_GNU_IFUNC symbol. */
1119 if (ELF64_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1120 {
1121 h = elf64_x86_64_get_local_sym_hash (htab, abfd, rel,
1122 TRUE);
1123 if (h == NULL)
1124 return FALSE;
1125
1126 /* Fake a STT_GNU_IFUNC symbol. */
1127 h->type = STT_GNU_IFUNC;
1128 h->def_regular = 1;
1129 h->ref_regular = 1;
1130 h->forced_local = 1;
1131 h->root.type = bfd_link_hash_defined;
1132 }
1133 else
1134 h = NULL;
1135 }
1136 else
1137 {
1138 isym = NULL;
1139 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1140 while (h->root.type == bfd_link_hash_indirect
1141 || h->root.type == bfd_link_hash_warning)
1142 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1143 }
1144
1145 if (h != NULL)
1146 {
1147 /* Create the ifunc sections for static executables. If we
1148 never see an indirect function symbol nor we are building
1149 a static executable, those sections will be empty and
1150 won't appear in output. */
1151 switch (r_type)
1152 {
1153 default:
1154 break;
1155
1156 case R_X86_64_32S:
1157 case R_X86_64_32:
1158 case R_X86_64_64:
1159 case R_X86_64_PC32:
1160 case R_X86_64_PC64:
1161 case R_X86_64_PLT32:
1162 case R_X86_64_GOTPCREL:
1163 case R_X86_64_GOTPCREL64:
1164 if (!_bfd_elf_create_ifunc_sections (abfd, info))
1165 return FALSE;
1166 break;
1167 }
1168
1169 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1170 it here if it is defined in a non-shared object. */
1171 if (h->type == STT_GNU_IFUNC
1172 && h->def_regular)
1173 {
1174 /* It is referenced by a non-shared object. */
1175 h->ref_regular = 1;
1176 h->needs_plt = 1;
1177
1178 /* STT_GNU_IFUNC symbol must go through PLT. */
1179 h->plt.refcount += 1;
1180
1181 /* STT_GNU_IFUNC needs dynamic sections. */
1182 if (htab->elf.dynobj == NULL)
1183 htab->elf.dynobj = abfd;
1184
1185 switch (r_type)
1186 {
1187 default:
1188 if (h->root.root.string)
1189 name = h->root.root.string;
1190 else
1191 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1192 NULL);
1193 (*_bfd_error_handler)
1194 (_("%B: relocation %s against STT_GNU_IFUNC "
1195 "symbol `%s' isn't handled by %s"), abfd,
1196 x86_64_elf_howto_table[r_type].name,
1197 name, __FUNCTION__);
1198 bfd_set_error (bfd_error_bad_value);
1199 return FALSE;
1200
1201 case R_X86_64_64:
1202 h->non_got_ref = 1;
1203 h->pointer_equality_needed = 1;
1204 if (info->shared)
1205 {
1206 /* We must copy these reloc types into the output
1207 file. Create a reloc section in dynobj and
1208 make room for this reloc. */
1209 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1210 (abfd, info, sec, sreloc,
1211 &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs);
1212 if (sreloc == NULL)
1213 return FALSE;
1214 }
1215 break;
1216
1217 case R_X86_64_32S:
1218 case R_X86_64_32:
1219 case R_X86_64_PC32:
1220 case R_X86_64_PC64:
1221 h->non_got_ref = 1;
1222 if (r_type != R_X86_64_PC32
1223 && r_type != R_X86_64_PC64)
1224 h->pointer_equality_needed = 1;
1225 break;
1226
1227 case R_X86_64_PLT32:
1228 break;
1229
1230 case R_X86_64_GOTPCREL:
1231 case R_X86_64_GOTPCREL64:
1232 h->got.refcount += 1;
1233 if (htab->elf.sgot == NULL
1234 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1235 info))
1236 return FALSE;
1237 break;
1238 }
1239
1240 continue;
1241 }
1242 }
1243
1244 if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1245 symtab_hdr, sym_hashes,
1246 &r_type, GOT_UNKNOWN,
1247 rel, rel_end, h, r_symndx))
1248 return FALSE;
1249
1250 switch (r_type)
1251 {
1252 case R_X86_64_TLSLD:
1253 htab->tls_ld_got.refcount += 1;
1254 goto create_got;
1255
1256 case R_X86_64_TPOFF32:
1257 if (!info->executable)
1258 {
1259 if (h)
1260 name = h->root.root.string;
1261 else
1262 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1263 NULL);
1264 (*_bfd_error_handler)
1265 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1266 abfd,
1267 x86_64_elf_howto_table[r_type].name, name);
1268 bfd_set_error (bfd_error_bad_value);
1269 return FALSE;
1270 }
1271 break;
1272
1273 case R_X86_64_GOTTPOFF:
1274 if (!info->executable)
1275 info->flags |= DF_STATIC_TLS;
1276 /* Fall through */
1277
1278 case R_X86_64_GOT32:
1279 case R_X86_64_GOTPCREL:
1280 case R_X86_64_TLSGD:
1281 case R_X86_64_GOT64:
1282 case R_X86_64_GOTPCREL64:
1283 case R_X86_64_GOTPLT64:
1284 case R_X86_64_GOTPC32_TLSDESC:
1285 case R_X86_64_TLSDESC_CALL:
1286 /* This symbol requires a global offset table entry. */
1287 {
1288 int tls_type, old_tls_type;
1289
1290 switch (r_type)
1291 {
1292 default: tls_type = GOT_NORMAL; break;
1293 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1294 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1295 case R_X86_64_GOTPC32_TLSDESC:
1296 case R_X86_64_TLSDESC_CALL:
1297 tls_type = GOT_TLS_GDESC; break;
1298 }
1299
1300 if (h != NULL)
1301 {
1302 if (r_type == R_X86_64_GOTPLT64)
1303 {
1304 /* This relocation indicates that we also need
1305 a PLT entry, as this is a function. We don't need
1306 a PLT entry for local symbols. */
1307 h->needs_plt = 1;
1308 h->plt.refcount += 1;
1309 }
1310 h->got.refcount += 1;
1311 old_tls_type = elf64_x86_64_hash_entry (h)->tls_type;
1312 }
1313 else
1314 {
1315 bfd_signed_vma *local_got_refcounts;
1316
1317 /* This is a global offset table entry for a local symbol. */
1318 local_got_refcounts = elf_local_got_refcounts (abfd);
1319 if (local_got_refcounts == NULL)
1320 {
1321 bfd_size_type size;
1322
1323 size = symtab_hdr->sh_info;
1324 size *= sizeof (bfd_signed_vma)
1325 + sizeof (bfd_vma) + sizeof (char);
1326 local_got_refcounts = ((bfd_signed_vma *)
1327 bfd_zalloc (abfd, size));
1328 if (local_got_refcounts == NULL)
1329 return FALSE;
1330 elf_local_got_refcounts (abfd) = local_got_refcounts;
1331 elf64_x86_64_local_tlsdesc_gotent (abfd)
1332 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1333 elf64_x86_64_local_got_tls_type (abfd)
1334 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1335 }
1336 local_got_refcounts[r_symndx] += 1;
1337 old_tls_type
1338 = elf64_x86_64_local_got_tls_type (abfd) [r_symndx];
1339 }
1340
1341 /* If a TLS symbol is accessed using IE at least once,
1342 there is no point to use dynamic model for it. */
1343 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1344 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1345 || tls_type != GOT_TLS_IE))
1346 {
1347 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1348 tls_type = old_tls_type;
1349 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1350 && GOT_TLS_GD_ANY_P (tls_type))
1351 tls_type |= old_tls_type;
1352 else
1353 {
1354 if (h)
1355 name = h->root.root.string;
1356 else
1357 name = bfd_elf_sym_name (abfd, symtab_hdr,
1358 isym, NULL);
1359 (*_bfd_error_handler)
1360 (_("%B: '%s' accessed both as normal and thread local symbol"),
1361 abfd, name);
1362 return FALSE;
1363 }
1364 }
1365
1366 if (old_tls_type != tls_type)
1367 {
1368 if (h != NULL)
1369 elf64_x86_64_hash_entry (h)->tls_type = tls_type;
1370 else
1371 elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1372 }
1373 }
1374 /* Fall through */
1375
1376 case R_X86_64_GOTOFF64:
1377 case R_X86_64_GOTPC32:
1378 case R_X86_64_GOTPC64:
1379 create_got:
1380 if (htab->elf.sgot == NULL)
1381 {
1382 if (htab->elf.dynobj == NULL)
1383 htab->elf.dynobj = abfd;
1384 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1385 info))
1386 return FALSE;
1387 }
1388 break;
1389
1390 case R_X86_64_PLT32:
1391 /* This symbol requires a procedure linkage table entry. We
1392 actually build the entry in adjust_dynamic_symbol,
1393 because this might be a case of linking PIC code which is
1394 never referenced by a dynamic object, in which case we
1395 don't need to generate a procedure linkage table entry
1396 after all. */
1397
1398 /* If this is a local symbol, we resolve it directly without
1399 creating a procedure linkage table entry. */
1400 if (h == NULL)
1401 continue;
1402
1403 h->needs_plt = 1;
1404 h->plt.refcount += 1;
1405 break;
1406
1407 case R_X86_64_PLTOFF64:
1408 /* This tries to form the 'address' of a function relative
1409 to GOT. For global symbols we need a PLT entry. */
1410 if (h != NULL)
1411 {
1412 h->needs_plt = 1;
1413 h->plt.refcount += 1;
1414 }
1415 goto create_got;
1416
1417 case R_X86_64_8:
1418 case R_X86_64_16:
1419 case R_X86_64_32:
1420 case R_X86_64_32S:
1421 /* Let's help debug shared library creation. These relocs
1422 cannot be used in shared libs. Don't error out for
1423 sections we don't care about, such as debug sections or
1424 non-constant sections. */
1425 if (info->shared
1426 && (sec->flags & SEC_ALLOC) != 0
1427 && (sec->flags & SEC_READONLY) != 0)
1428 {
1429 if (h)
1430 name = h->root.root.string;
1431 else
1432 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1433 (*_bfd_error_handler)
1434 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1435 abfd, x86_64_elf_howto_table[r_type].name, name);
1436 bfd_set_error (bfd_error_bad_value);
1437 return FALSE;
1438 }
1439 /* Fall through. */
1440
1441 case R_X86_64_PC8:
1442 case R_X86_64_PC16:
1443 case R_X86_64_PC32:
1444 case R_X86_64_PC64:
1445 case R_X86_64_64:
1446 if (h != NULL && info->executable)
1447 {
1448 /* If this reloc is in a read-only section, we might
1449 need a copy reloc. We can't check reliably at this
1450 stage whether the section is read-only, as input
1451 sections have not yet been mapped to output sections.
1452 Tentatively set the flag for now, and correct in
1453 adjust_dynamic_symbol. */
1454 h->non_got_ref = 1;
1455
1456 /* We may need a .plt entry if the function this reloc
1457 refers to is in a shared lib. */
1458 h->plt.refcount += 1;
1459 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
1460 h->pointer_equality_needed = 1;
1461 }
1462
1463 /* If we are creating a shared library, and this is a reloc
1464 against a global symbol, or a non PC relative reloc
1465 against a local symbol, then we need to copy the reloc
1466 into the shared library. However, if we are linking with
1467 -Bsymbolic, we do not need to copy a reloc against a
1468 global symbol which is defined in an object we are
1469 including in the link (i.e., DEF_REGULAR is set). At
1470 this point we have not seen all the input files, so it is
1471 possible that DEF_REGULAR is not set now but will be set
1472 later (it is never cleared). In case of a weak definition,
1473 DEF_REGULAR may be cleared later by a strong definition in
1474 a shared library. We account for that possibility below by
1475 storing information in the relocs_copied field of the hash
1476 table entry. A similar situation occurs when creating
1477 shared libraries and symbol visibility changes render the
1478 symbol local.
1479
1480 If on the other hand, we are creating an executable, we
1481 may need to keep relocations for symbols satisfied by a
1482 dynamic library if we manage to avoid copy relocs for the
1483 symbol. */
1484 if ((info->shared
1485 && (sec->flags & SEC_ALLOC) != 0
1486 && (! IS_X86_64_PCREL_TYPE (r_type)
1487 || (h != NULL
1488 && (! SYMBOLIC_BIND (info, h)
1489 || h->root.type == bfd_link_hash_defweak
1490 || !h->def_regular))))
1491 || (ELIMINATE_COPY_RELOCS
1492 && !info->shared
1493 && (sec->flags & SEC_ALLOC) != 0
1494 && h != NULL
1495 && (h->root.type == bfd_link_hash_defweak
1496 || !h->def_regular)))
1497 {
1498 struct elf_dyn_relocs *p;
1499 struct elf_dyn_relocs **head;
1500
1501 /* We must copy these reloc types into the output file.
1502 Create a reloc section in dynobj and make room for
1503 this reloc. */
1504 if (sreloc == NULL)
1505 {
1506 if (htab->elf.dynobj == NULL)
1507 htab->elf.dynobj = abfd;
1508
1509 sreloc = _bfd_elf_make_dynamic_reloc_section
1510 (sec, htab->elf.dynobj, 3, abfd, /*rela?*/ TRUE);
1511
1512 if (sreloc == NULL)
1513 return FALSE;
1514 }
1515
1516 /* If this is a global symbol, we count the number of
1517 relocations we need for this symbol. */
1518 if (h != NULL)
1519 {
1520 head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs;
1521 }
1522 else
1523 {
1524 /* Track dynamic relocs needed for local syms too.
1525 We really need local syms available to do this
1526 easily. Oh well. */
1527 asection *s;
1528 void **vpp;
1529
1530 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1531 abfd, r_symndx);
1532 if (isym == NULL)
1533 return FALSE;
1534
1535 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1536 if (s == NULL)
1537 s = sec;
1538
1539 /* Beware of type punned pointers vs strict aliasing
1540 rules. */
1541 vpp = &(elf_section_data (s)->local_dynrel);
1542 head = (struct elf_dyn_relocs **)vpp;
1543 }
1544
1545 p = *head;
1546 if (p == NULL || p->sec != sec)
1547 {
1548 bfd_size_type amt = sizeof *p;
1549
1550 p = ((struct elf_dyn_relocs *)
1551 bfd_alloc (htab->elf.dynobj, amt));
1552 if (p == NULL)
1553 return FALSE;
1554 p->next = *head;
1555 *head = p;
1556 p->sec = sec;
1557 p->count = 0;
1558 p->pc_count = 0;
1559 }
1560
1561 p->count += 1;
1562 if (IS_X86_64_PCREL_TYPE (r_type))
1563 p->pc_count += 1;
1564 }
1565 break;
1566
1567 /* This relocation describes the C++ object vtable hierarchy.
1568 Reconstruct it for later use during GC. */
1569 case R_X86_64_GNU_VTINHERIT:
1570 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1571 return FALSE;
1572 break;
1573
1574 /* This relocation describes which C++ vtable entries are actually
1575 used. Record for later use during GC. */
1576 case R_X86_64_GNU_VTENTRY:
1577 BFD_ASSERT (h != NULL);
1578 if (h != NULL
1579 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1580 return FALSE;
1581 break;
1582
1583 default:
1584 break;
1585 }
1586 }
1587
1588 return TRUE;
1589 }
1590
1591 /* Return the section that should be marked against GC for a given
1592 relocation. */
1593
1594 static asection *
1595 elf64_x86_64_gc_mark_hook (asection *sec,
1596 struct bfd_link_info *info,
1597 Elf_Internal_Rela *rel,
1598 struct elf_link_hash_entry *h,
1599 Elf_Internal_Sym *sym)
1600 {
1601 if (h != NULL)
1602 switch (ELF64_R_TYPE (rel->r_info))
1603 {
1604 case R_X86_64_GNU_VTINHERIT:
1605 case R_X86_64_GNU_VTENTRY:
1606 return NULL;
1607 }
1608
1609 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1610 }
1611
1612 /* Update the got entry reference counts for the section being removed. */
1613
1614 static bfd_boolean
1615 elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1616 asection *sec,
1617 const Elf_Internal_Rela *relocs)
1618 {
1619 struct elf64_x86_64_link_hash_table *htab;
1620 Elf_Internal_Shdr *symtab_hdr;
1621 struct elf_link_hash_entry **sym_hashes;
1622 bfd_signed_vma *local_got_refcounts;
1623 const Elf_Internal_Rela *rel, *relend;
1624
1625 if (info->relocatable)
1626 return TRUE;
1627
1628 htab = elf64_x86_64_hash_table (info);
1629 if (htab == NULL)
1630 return FALSE;
1631
1632 elf_section_data (sec)->local_dynrel = NULL;
1633
1634 symtab_hdr = &elf_symtab_hdr (abfd);
1635 sym_hashes = elf_sym_hashes (abfd);
1636 local_got_refcounts = elf_local_got_refcounts (abfd);
1637
1638 relend = relocs + sec->reloc_count;
1639 for (rel = relocs; rel < relend; rel++)
1640 {
1641 unsigned long r_symndx;
1642 unsigned int r_type;
1643 struct elf_link_hash_entry *h = NULL;
1644
1645 r_symndx = ELF64_R_SYM (rel->r_info);
1646 if (r_symndx >= symtab_hdr->sh_info)
1647 {
1648 struct elf64_x86_64_link_hash_entry *eh;
1649 struct elf_dyn_relocs **pp;
1650 struct elf_dyn_relocs *p;
1651
1652 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1653 while (h->root.type == bfd_link_hash_indirect
1654 || h->root.type == bfd_link_hash_warning)
1655 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1656 eh = (struct elf64_x86_64_link_hash_entry *) h;
1657
1658 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1659 if (p->sec == sec)
1660 {
1661 /* Everything must go for SEC. */
1662 *pp = p->next;
1663 break;
1664 }
1665 }
1666 else
1667 {
1668 /* A local symbol. */
1669 Elf_Internal_Sym *isym;
1670
1671 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1672 abfd, r_symndx);
1673
1674 /* Check relocation against local STT_GNU_IFUNC symbol. */
1675 if (isym != NULL
1676 && ELF64_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1677 {
1678 h = elf64_x86_64_get_local_sym_hash (htab, abfd, rel,
1679 FALSE);
1680 if (h == NULL)
1681 abort ();
1682 }
1683 }
1684
1685 r_type = ELF64_R_TYPE (rel->r_info);
1686 if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
1687 symtab_hdr, sym_hashes,
1688 &r_type, GOT_UNKNOWN,
1689 rel, relend, h, r_symndx))
1690 return FALSE;
1691
1692 switch (r_type)
1693 {
1694 case R_X86_64_TLSLD:
1695 if (htab->tls_ld_got.refcount > 0)
1696 htab->tls_ld_got.refcount -= 1;
1697 break;
1698
1699 case R_X86_64_TLSGD:
1700 case R_X86_64_GOTPC32_TLSDESC:
1701 case R_X86_64_TLSDESC_CALL:
1702 case R_X86_64_GOTTPOFF:
1703 case R_X86_64_GOT32:
1704 case R_X86_64_GOTPCREL:
1705 case R_X86_64_GOT64:
1706 case R_X86_64_GOTPCREL64:
1707 case R_X86_64_GOTPLT64:
1708 if (h != NULL)
1709 {
1710 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
1711 h->plt.refcount -= 1;
1712 if (h->got.refcount > 0)
1713 h->got.refcount -= 1;
1714 if (h->type == STT_GNU_IFUNC)
1715 {
1716 if (h->plt.refcount > 0)
1717 h->plt.refcount -= 1;
1718 }
1719 }
1720 else if (local_got_refcounts != NULL)
1721 {
1722 if (local_got_refcounts[r_symndx] > 0)
1723 local_got_refcounts[r_symndx] -= 1;
1724 }
1725 break;
1726
1727 case R_X86_64_8:
1728 case R_X86_64_16:
1729 case R_X86_64_32:
1730 case R_X86_64_64:
1731 case R_X86_64_32S:
1732 case R_X86_64_PC8:
1733 case R_X86_64_PC16:
1734 case R_X86_64_PC32:
1735 case R_X86_64_PC64:
1736 if (info->shared)
1737 break;
1738 /* Fall thru */
1739
1740 case R_X86_64_PLT32:
1741 case R_X86_64_PLTOFF64:
1742 if (h != NULL)
1743 {
1744 if (h->plt.refcount > 0)
1745 h->plt.refcount -= 1;
1746 }
1747 break;
1748
1749 default:
1750 break;
1751 }
1752 }
1753
1754 return TRUE;
1755 }
1756
1757 /* Adjust a symbol defined by a dynamic object and referenced by a
1758 regular object. The current definition is in some section of the
1759 dynamic object, but we're not including those sections. We have to
1760 change the definition to something the rest of the link can
1761 understand. */
1762
1763 static bfd_boolean
1764 elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
1765 struct elf_link_hash_entry *h)
1766 {
1767 struct elf64_x86_64_link_hash_table *htab;
1768 asection *s;
1769
1770 /* STT_GNU_IFUNC symbol must go through PLT. */
1771 if (h->type == STT_GNU_IFUNC)
1772 {
1773 if (h->plt.refcount <= 0)
1774 {
1775 h->plt.offset = (bfd_vma) -1;
1776 h->needs_plt = 0;
1777 }
1778 return TRUE;
1779 }
1780
1781 /* If this is a function, put it in the procedure linkage table. We
1782 will fill in the contents of the procedure linkage table later,
1783 when we know the address of the .got section. */
1784 if (h->type == STT_FUNC
1785 || h->needs_plt)
1786 {
1787 if (h->plt.refcount <= 0
1788 || SYMBOL_CALLS_LOCAL (info, h)
1789 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1790 && h->root.type == bfd_link_hash_undefweak))
1791 {
1792 /* This case can occur if we saw a PLT32 reloc in an input
1793 file, but the symbol was never referred to by a dynamic
1794 object, or if all references were garbage collected. In
1795 such a case, we don't actually need to build a procedure
1796 linkage table, and we can just do a PC32 reloc instead. */
1797 h->plt.offset = (bfd_vma) -1;
1798 h->needs_plt = 0;
1799 }
1800
1801 return TRUE;
1802 }
1803 else
1804 /* It's possible that we incorrectly decided a .plt reloc was
1805 needed for an R_X86_64_PC32 reloc to a non-function sym in
1806 check_relocs. We can't decide accurately between function and
1807 non-function syms in check-relocs; Objects loaded later in
1808 the link may change h->type. So fix it now. */
1809 h->plt.offset = (bfd_vma) -1;
1810
1811 /* If this is a weak symbol, and there is a real definition, the
1812 processor independent code will have arranged for us to see the
1813 real definition first, and we can just use the same value. */
1814 if (h->u.weakdef != NULL)
1815 {
1816 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1817 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1818 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1819 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1820 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1821 h->non_got_ref = h->u.weakdef->non_got_ref;
1822 return TRUE;
1823 }
1824
1825 /* This is a reference to a symbol defined by a dynamic object which
1826 is not a function. */
1827
1828 /* If we are creating a shared library, we must presume that the
1829 only references to the symbol are via the global offset table.
1830 For such cases we need not do anything here; the relocations will
1831 be handled correctly by relocate_section. */
1832 if (info->shared)
1833 return TRUE;
1834
1835 /* If there are no references to this symbol that do not use the
1836 GOT, we don't need to generate a copy reloc. */
1837 if (!h->non_got_ref)
1838 return TRUE;
1839
1840 /* If -z nocopyreloc was given, we won't generate them either. */
1841 if (info->nocopyreloc)
1842 {
1843 h->non_got_ref = 0;
1844 return TRUE;
1845 }
1846
1847 if (ELIMINATE_COPY_RELOCS)
1848 {
1849 struct elf64_x86_64_link_hash_entry * eh;
1850 struct elf_dyn_relocs *p;
1851
1852 eh = (struct elf64_x86_64_link_hash_entry *) h;
1853 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1854 {
1855 s = p->sec->output_section;
1856 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1857 break;
1858 }
1859
1860 /* If we didn't find any dynamic relocs in read-only sections, then
1861 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1862 if (p == NULL)
1863 {
1864 h->non_got_ref = 0;
1865 return TRUE;
1866 }
1867 }
1868
1869 if (h->size == 0)
1870 {
1871 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1872 h->root.root.string);
1873 return TRUE;
1874 }
1875
1876 /* We must allocate the symbol in our .dynbss section, which will
1877 become part of the .bss section of the executable. There will be
1878 an entry for this symbol in the .dynsym section. The dynamic
1879 object will contain position independent code, so all references
1880 from the dynamic object to this symbol will go through the global
1881 offset table. The dynamic linker will use the .dynsym entry to
1882 determine the address it must put in the global offset table, so
1883 both the dynamic object and the regular object will refer to the
1884 same memory location for the variable. */
1885
1886 htab = elf64_x86_64_hash_table (info);
1887 if (htab == NULL)
1888 return FALSE;
1889
1890 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1891 to copy the initial value out of the dynamic object and into the
1892 runtime process image. */
1893 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1894 {
1895 htab->srelbss->size += sizeof (Elf64_External_Rela);
1896 h->needs_copy = 1;
1897 }
1898
1899 s = htab->sdynbss;
1900
1901 return _bfd_elf_adjust_dynamic_copy (h, s);
1902 }
1903
1904 /* Allocate space in .plt, .got and associated reloc sections for
1905 dynamic relocs. */
1906
1907 static bfd_boolean
1908 elf64_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1909 {
1910 struct bfd_link_info *info;
1911 struct elf64_x86_64_link_hash_table *htab;
1912 struct elf64_x86_64_link_hash_entry *eh;
1913 struct elf_dyn_relocs *p;
1914
1915 if (h->root.type == bfd_link_hash_indirect)
1916 return TRUE;
1917
1918 if (h->root.type == bfd_link_hash_warning)
1919 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1920 eh = (struct elf64_x86_64_link_hash_entry *) h;
1921
1922 info = (struct bfd_link_info *) inf;
1923 htab = elf64_x86_64_hash_table (info);
1924 if (htab == NULL)
1925 return FALSE;
1926
1927 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
1928 here if it is defined and referenced in a non-shared object. */
1929 if (h->type == STT_GNU_IFUNC
1930 && h->def_regular)
1931 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
1932 &eh->dyn_relocs,
1933 PLT_ENTRY_SIZE,
1934 GOT_ENTRY_SIZE);
1935 else if (htab->elf.dynamic_sections_created
1936 && h->plt.refcount > 0)
1937 {
1938 /* Make sure this symbol is output as a dynamic symbol.
1939 Undefined weak syms won't yet be marked as dynamic. */
1940 if (h->dynindx == -1
1941 && !h->forced_local)
1942 {
1943 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1944 return FALSE;
1945 }
1946
1947 if (info->shared
1948 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1949 {
1950 asection *s = htab->elf.splt;
1951
1952 /* If this is the first .plt entry, make room for the special
1953 first entry. */
1954 if (s->size == 0)
1955 s->size += PLT_ENTRY_SIZE;
1956
1957 h->plt.offset = s->size;
1958
1959 /* If this symbol is not defined in a regular file, and we are
1960 not generating a shared library, then set the symbol to this
1961 location in the .plt. This is required to make function
1962 pointers compare as equal between the normal executable and
1963 the shared library. */
1964 if (! info->shared
1965 && !h->def_regular)
1966 {
1967 h->root.u.def.section = s;
1968 h->root.u.def.value = h->plt.offset;
1969 }
1970
1971 /* Make room for this entry. */
1972 s->size += PLT_ENTRY_SIZE;
1973
1974 /* We also need to make an entry in the .got.plt section, which
1975 will be placed in the .got section by the linker script. */
1976 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
1977
1978 /* We also need to make an entry in the .rela.plt section. */
1979 htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
1980 htab->elf.srelplt->reloc_count++;
1981 }
1982 else
1983 {
1984 h->plt.offset = (bfd_vma) -1;
1985 h->needs_plt = 0;
1986 }
1987 }
1988 else
1989 {
1990 h->plt.offset = (bfd_vma) -1;
1991 h->needs_plt = 0;
1992 }
1993
1994 eh->tlsdesc_got = (bfd_vma) -1;
1995
1996 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
1997 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
1998 if (h->got.refcount > 0
1999 && info->executable
2000 && h->dynindx == -1
2001 && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2002 {
2003 h->got.offset = (bfd_vma) -1;
2004 }
2005 else if (h->got.refcount > 0)
2006 {
2007 asection *s;
2008 bfd_boolean dyn;
2009 int tls_type = elf64_x86_64_hash_entry (h)->tls_type;
2010
2011 /* Make sure this symbol is output as a dynamic symbol.
2012 Undefined weak syms won't yet be marked as dynamic. */
2013 if (h->dynindx == -1
2014 && !h->forced_local)
2015 {
2016 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2017 return FALSE;
2018 }
2019
2020 if (GOT_TLS_GDESC_P (tls_type))
2021 {
2022 eh->tlsdesc_got = htab->elf.sgotplt->size
2023 - elf64_x86_64_compute_jump_table_size (htab);
2024 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2025 h->got.offset = (bfd_vma) -2;
2026 }
2027 if (! GOT_TLS_GDESC_P (tls_type)
2028 || GOT_TLS_GD_P (tls_type))
2029 {
2030 s = htab->elf.sgot;
2031 h->got.offset = s->size;
2032 s->size += GOT_ENTRY_SIZE;
2033 if (GOT_TLS_GD_P (tls_type))
2034 s->size += GOT_ENTRY_SIZE;
2035 }
2036 dyn = htab->elf.dynamic_sections_created;
2037 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2038 and two if global.
2039 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2040 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2041 || tls_type == GOT_TLS_IE)
2042 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
2043 else if (GOT_TLS_GD_P (tls_type))
2044 htab->elf.srelgot->size += 2 * sizeof (Elf64_External_Rela);
2045 else if (! GOT_TLS_GDESC_P (tls_type)
2046 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2047 || h->root.type != bfd_link_hash_undefweak)
2048 && (info->shared
2049 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2050 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
2051 if (GOT_TLS_GDESC_P (tls_type))
2052 {
2053 htab->elf.srelplt->size += sizeof (Elf64_External_Rela);
2054 htab->tlsdesc_plt = (bfd_vma) -1;
2055 }
2056 }
2057 else
2058 h->got.offset = (bfd_vma) -1;
2059
2060 if (eh->dyn_relocs == NULL)
2061 return TRUE;
2062
2063 /* In the shared -Bsymbolic case, discard space allocated for
2064 dynamic pc-relative relocs against symbols which turn out to be
2065 defined in regular objects. For the normal shared case, discard
2066 space for pc-relative relocs that have become local due to symbol
2067 visibility changes. */
2068
2069 if (info->shared)
2070 {
2071 /* Relocs that use pc_count are those that appear on a call
2072 insn, or certain REL relocs that can generated via assembly.
2073 We want calls to protected symbols to resolve directly to the
2074 function rather than going via the plt. If people want
2075 function pointer comparisons to work as expected then they
2076 should avoid writing weird assembly. */
2077 if (SYMBOL_CALLS_LOCAL (info, h))
2078 {
2079 struct elf_dyn_relocs **pp;
2080
2081 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2082 {
2083 p->count -= p->pc_count;
2084 p->pc_count = 0;
2085 if (p->count == 0)
2086 *pp = p->next;
2087 else
2088 pp = &p->next;
2089 }
2090 }
2091
2092 /* Also discard relocs on undefined weak syms with non-default
2093 visibility. */
2094 if (eh->dyn_relocs != NULL
2095 && h->root.type == bfd_link_hash_undefweak)
2096 {
2097 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2098 eh->dyn_relocs = NULL;
2099
2100 /* Make sure undefined weak symbols are output as a dynamic
2101 symbol in PIEs. */
2102 else if (h->dynindx == -1
2103 && ! h->forced_local
2104 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2105 return FALSE;
2106 }
2107
2108 }
2109 else if (ELIMINATE_COPY_RELOCS)
2110 {
2111 /* For the non-shared case, discard space for relocs against
2112 symbols which turn out to need copy relocs or are not
2113 dynamic. */
2114
2115 if (!h->non_got_ref
2116 && ((h->def_dynamic
2117 && !h->def_regular)
2118 || (htab->elf.dynamic_sections_created
2119 && (h->root.type == bfd_link_hash_undefweak
2120 || h->root.type == bfd_link_hash_undefined))))
2121 {
2122 /* Make sure this symbol is output as a dynamic symbol.
2123 Undefined weak syms won't yet be marked as dynamic. */
2124 if (h->dynindx == -1
2125 && ! h->forced_local
2126 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2127 return FALSE;
2128
2129 /* If that succeeded, we know we'll be keeping all the
2130 relocs. */
2131 if (h->dynindx != -1)
2132 goto keep;
2133 }
2134
2135 eh->dyn_relocs = NULL;
2136
2137 keep: ;
2138 }
2139
2140 /* Finally, allocate space. */
2141 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2142 {
2143 asection * sreloc;
2144
2145 sreloc = elf_section_data (p->sec)->sreloc;
2146
2147 BFD_ASSERT (sreloc != NULL);
2148
2149 sreloc->size += p->count * sizeof (Elf64_External_Rela);
2150 }
2151
2152 return TRUE;
2153 }
2154
2155 /* Allocate space in .plt, .got and associated reloc sections for
2156 local dynamic relocs. */
2157
2158 static bfd_boolean
2159 elf64_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2160 {
2161 struct elf_link_hash_entry *h
2162 = (struct elf_link_hash_entry *) *slot;
2163
2164 if (h->type != STT_GNU_IFUNC
2165 || !h->def_regular
2166 || !h->ref_regular
2167 || !h->forced_local
2168 || h->root.type != bfd_link_hash_defined)
2169 abort ();
2170
2171 return elf64_x86_64_allocate_dynrelocs (h, inf);
2172 }
2173
2174 /* Find any dynamic relocs that apply to read-only sections. */
2175
2176 static bfd_boolean
2177 elf64_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
2178 {
2179 struct elf64_x86_64_link_hash_entry *eh;
2180 struct elf_dyn_relocs *p;
2181
2182 if (h->root.type == bfd_link_hash_warning)
2183 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2184
2185 eh = (struct elf64_x86_64_link_hash_entry *) h;
2186 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2187 {
2188 asection *s = p->sec->output_section;
2189
2190 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2191 {
2192 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2193
2194 info->flags |= DF_TEXTREL;
2195
2196 /* Not an error, just cut short the traversal. */
2197 return FALSE;
2198 }
2199 }
2200 return TRUE;
2201 }
2202
2203 /* Set the sizes of the dynamic sections. */
2204
2205 static bfd_boolean
2206 elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2207 struct bfd_link_info *info)
2208 {
2209 struct elf64_x86_64_link_hash_table *htab;
2210 bfd *dynobj;
2211 asection *s;
2212 bfd_boolean relocs;
2213 bfd *ibfd;
2214
2215 htab = elf64_x86_64_hash_table (info);
2216 if (htab == NULL)
2217 return FALSE;
2218
2219 dynobj = htab->elf.dynobj;
2220 if (dynobj == NULL)
2221 abort ();
2222
2223 if (htab->elf.dynamic_sections_created)
2224 {
2225 /* Set the contents of the .interp section to the interpreter. */
2226 if (info->executable)
2227 {
2228 s = bfd_get_section_by_name (dynobj, ".interp");
2229 if (s == NULL)
2230 abort ();
2231 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2232 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2233 }
2234 }
2235
2236 /* Set up .got offsets for local syms, and space for local dynamic
2237 relocs. */
2238 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2239 {
2240 bfd_signed_vma *local_got;
2241 bfd_signed_vma *end_local_got;
2242 char *local_tls_type;
2243 bfd_vma *local_tlsdesc_gotent;
2244 bfd_size_type locsymcount;
2245 Elf_Internal_Shdr *symtab_hdr;
2246 asection *srel;
2247
2248 if (! is_x86_64_elf (ibfd))
2249 continue;
2250
2251 for (s = ibfd->sections; s != NULL; s = s->next)
2252 {
2253 struct elf_dyn_relocs *p;
2254
2255 for (p = (struct elf_dyn_relocs *)
2256 (elf_section_data (s)->local_dynrel);
2257 p != NULL;
2258 p = p->next)
2259 {
2260 if (!bfd_is_abs_section (p->sec)
2261 && bfd_is_abs_section (p->sec->output_section))
2262 {
2263 /* Input section has been discarded, either because
2264 it is a copy of a linkonce section or due to
2265 linker script /DISCARD/, so we'll be discarding
2266 the relocs too. */
2267 }
2268 else if (p->count != 0)
2269 {
2270 srel = elf_section_data (p->sec)->sreloc;
2271 srel->size += p->count * sizeof (Elf64_External_Rela);
2272 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2273 info->flags |= DF_TEXTREL;
2274 }
2275 }
2276 }
2277
2278 local_got = elf_local_got_refcounts (ibfd);
2279 if (!local_got)
2280 continue;
2281
2282 symtab_hdr = &elf_symtab_hdr (ibfd);
2283 locsymcount = symtab_hdr->sh_info;
2284 end_local_got = local_got + locsymcount;
2285 local_tls_type = elf64_x86_64_local_got_tls_type (ibfd);
2286 local_tlsdesc_gotent = elf64_x86_64_local_tlsdesc_gotent (ibfd);
2287 s = htab->elf.sgot;
2288 srel = htab->elf.srelgot;
2289 for (; local_got < end_local_got;
2290 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2291 {
2292 *local_tlsdesc_gotent = (bfd_vma) -1;
2293 if (*local_got > 0)
2294 {
2295 if (GOT_TLS_GDESC_P (*local_tls_type))
2296 {
2297 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2298 - elf64_x86_64_compute_jump_table_size (htab);
2299 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2300 *local_got = (bfd_vma) -2;
2301 }
2302 if (! GOT_TLS_GDESC_P (*local_tls_type)
2303 || GOT_TLS_GD_P (*local_tls_type))
2304 {
2305 *local_got = s->size;
2306 s->size += GOT_ENTRY_SIZE;
2307 if (GOT_TLS_GD_P (*local_tls_type))
2308 s->size += GOT_ENTRY_SIZE;
2309 }
2310 if (info->shared
2311 || GOT_TLS_GD_ANY_P (*local_tls_type)
2312 || *local_tls_type == GOT_TLS_IE)
2313 {
2314 if (GOT_TLS_GDESC_P (*local_tls_type))
2315 {
2316 htab->elf.srelplt->size
2317 += sizeof (Elf64_External_Rela);
2318 htab->tlsdesc_plt = (bfd_vma) -1;
2319 }
2320 if (! GOT_TLS_GDESC_P (*local_tls_type)
2321 || GOT_TLS_GD_P (*local_tls_type))
2322 srel->size += sizeof (Elf64_External_Rela);
2323 }
2324 }
2325 else
2326 *local_got = (bfd_vma) -1;
2327 }
2328 }
2329
2330 if (htab->tls_ld_got.refcount > 0)
2331 {
2332 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2333 relocs. */
2334 htab->tls_ld_got.offset = htab->elf.sgot->size;
2335 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2336 htab->elf.srelgot->size += sizeof (Elf64_External_Rela);
2337 }
2338 else
2339 htab->tls_ld_got.offset = -1;
2340
2341 /* Allocate global sym .plt and .got entries, and space for global
2342 sym dynamic relocs. */
2343 elf_link_hash_traverse (&htab->elf, elf64_x86_64_allocate_dynrelocs,
2344 info);
2345
2346 /* Allocate .plt and .got entries, and space for local symbols. */
2347 htab_traverse (htab->loc_hash_table,
2348 elf64_x86_64_allocate_local_dynrelocs,
2349 info);
2350
2351 /* For every jump slot reserved in the sgotplt, reloc_count is
2352 incremented. However, when we reserve space for TLS descriptors,
2353 it's not incremented, so in order to compute the space reserved
2354 for them, it suffices to multiply the reloc count by the jump
2355 slot size. */
2356 if (htab->elf.srelplt)
2357 htab->sgotplt_jump_table_size
2358 = elf64_x86_64_compute_jump_table_size (htab);
2359
2360 if (htab->tlsdesc_plt)
2361 {
2362 /* If we're not using lazy TLS relocations, don't generate the
2363 PLT and GOT entries they require. */
2364 if ((info->flags & DF_BIND_NOW))
2365 htab->tlsdesc_plt = 0;
2366 else
2367 {
2368 htab->tlsdesc_got = htab->elf.sgot->size;
2369 htab->elf.sgot->size += GOT_ENTRY_SIZE;
2370 /* Reserve room for the initial entry.
2371 FIXME: we could probably do away with it in this case. */
2372 if (htab->elf.splt->size == 0)
2373 htab->elf.splt->size += PLT_ENTRY_SIZE;
2374 htab->tlsdesc_plt = htab->elf.splt->size;
2375 htab->elf.splt->size += PLT_ENTRY_SIZE;
2376 }
2377 }
2378
2379 if (htab->elf.sgotplt)
2380 {
2381 struct elf_link_hash_entry *got;
2382 got = elf_link_hash_lookup (elf_hash_table (info),
2383 "_GLOBAL_OFFSET_TABLE_",
2384 FALSE, FALSE, FALSE);
2385
2386 /* Don't allocate .got.plt section if there are no GOT nor PLT
2387 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2388 if ((got == NULL
2389 || !got->ref_regular_nonweak)
2390 && (htab->elf.sgotplt->size
2391 == get_elf_backend_data (output_bfd)->got_header_size)
2392 && (htab->elf.splt == NULL
2393 || htab->elf.splt->size == 0)
2394 && (htab->elf.sgot == NULL
2395 || htab->elf.sgot->size == 0)
2396 && (htab->elf.iplt == NULL
2397 || htab->elf.iplt->size == 0)
2398 && (htab->elf.igotplt == NULL
2399 || htab->elf.igotplt->size == 0))
2400 htab->elf.sgotplt->size = 0;
2401 }
2402
2403 /* We now have determined the sizes of the various dynamic sections.
2404 Allocate memory for them. */
2405 relocs = FALSE;
2406 for (s = dynobj->sections; s != NULL; s = s->next)
2407 {
2408 if ((s->flags & SEC_LINKER_CREATED) == 0)
2409 continue;
2410
2411 if (s == htab->elf.splt
2412 || s == htab->elf.sgot
2413 || s == htab->elf.sgotplt
2414 || s == htab->elf.iplt
2415 || s == htab->elf.igotplt
2416 || s == htab->sdynbss)
2417 {
2418 /* Strip this section if we don't need it; see the
2419 comment below. */
2420 }
2421 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2422 {
2423 if (s->size != 0 && s != htab->elf.srelplt)
2424 relocs = TRUE;
2425
2426 /* We use the reloc_count field as a counter if we need
2427 to copy relocs into the output file. */
2428 if (s != htab->elf.srelplt)
2429 s->reloc_count = 0;
2430 }
2431 else
2432 {
2433 /* It's not one of our sections, so don't allocate space. */
2434 continue;
2435 }
2436
2437 if (s->size == 0)
2438 {
2439 /* If we don't need this section, strip it from the
2440 output file. This is mostly to handle .rela.bss and
2441 .rela.plt. We must create both sections in
2442 create_dynamic_sections, because they must be created
2443 before the linker maps input sections to output
2444 sections. The linker does that before
2445 adjust_dynamic_symbol is called, and it is that
2446 function which decides whether anything needs to go
2447 into these sections. */
2448
2449 s->flags |= SEC_EXCLUDE;
2450 continue;
2451 }
2452
2453 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2454 continue;
2455
2456 /* Allocate memory for the section contents. We use bfd_zalloc
2457 here in case unused entries are not reclaimed before the
2458 section's contents are written out. This should not happen,
2459 but this way if it does, we get a R_X86_64_NONE reloc instead
2460 of garbage. */
2461 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2462 if (s->contents == NULL)
2463 return FALSE;
2464 }
2465
2466 if (htab->elf.dynamic_sections_created)
2467 {
2468 /* Add some entries to the .dynamic section. We fill in the
2469 values later, in elf64_x86_64_finish_dynamic_sections, but we
2470 must add the entries now so that we get the correct size for
2471 the .dynamic section. The DT_DEBUG entry is filled in by the
2472 dynamic linker and used by the debugger. */
2473 #define add_dynamic_entry(TAG, VAL) \
2474 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2475
2476 if (info->executable)
2477 {
2478 if (!add_dynamic_entry (DT_DEBUG, 0))
2479 return FALSE;
2480 }
2481
2482 if (htab->elf.splt->size != 0)
2483 {
2484 if (!add_dynamic_entry (DT_PLTGOT, 0)
2485 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2486 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2487 || !add_dynamic_entry (DT_JMPREL, 0))
2488 return FALSE;
2489
2490 if (htab->tlsdesc_plt
2491 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
2492 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
2493 return FALSE;
2494 }
2495
2496 if (relocs)
2497 {
2498 if (!add_dynamic_entry (DT_RELA, 0)
2499 || !add_dynamic_entry (DT_RELASZ, 0)
2500 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2501 return FALSE;
2502
2503 /* If any dynamic relocs apply to a read-only section,
2504 then we need a DT_TEXTREL entry. */
2505 if ((info->flags & DF_TEXTREL) == 0)
2506 elf_link_hash_traverse (&htab->elf,
2507 elf64_x86_64_readonly_dynrelocs,
2508 info);
2509
2510 if ((info->flags & DF_TEXTREL) != 0)
2511 {
2512 if (!add_dynamic_entry (DT_TEXTREL, 0))
2513 return FALSE;
2514 }
2515 }
2516 }
2517 #undef add_dynamic_entry
2518
2519 return TRUE;
2520 }
2521
2522 static bfd_boolean
2523 elf64_x86_64_always_size_sections (bfd *output_bfd,
2524 struct bfd_link_info *info)
2525 {
2526 asection *tls_sec = elf_hash_table (info)->tls_sec;
2527
2528 if (tls_sec)
2529 {
2530 struct elf_link_hash_entry *tlsbase;
2531
2532 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2533 "_TLS_MODULE_BASE_",
2534 FALSE, FALSE, FALSE);
2535
2536 if (tlsbase && tlsbase->type == STT_TLS)
2537 {
2538 struct elf64_x86_64_link_hash_table *htab;
2539 struct bfd_link_hash_entry *bh = NULL;
2540 const struct elf_backend_data *bed
2541 = get_elf_backend_data (output_bfd);
2542
2543 htab = elf64_x86_64_hash_table (info);
2544 if (htab == NULL)
2545 return FALSE;
2546
2547 if (!(_bfd_generic_link_add_one_symbol
2548 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2549 tls_sec, 0, NULL, FALSE,
2550 bed->collect, &bh)))
2551 return FALSE;
2552
2553 htab->tls_module_base = bh;
2554
2555 tlsbase = (struct elf_link_hash_entry *)bh;
2556 tlsbase->def_regular = 1;
2557 tlsbase->other = STV_HIDDEN;
2558 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2559 }
2560 }
2561
2562 return TRUE;
2563 }
2564
2565 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2566 executables. Rather than setting it to the beginning of the TLS
2567 section, we have to set it to the end. This function may be called
2568 multiple times, it is idempotent. */
2569
2570 static void
2571 elf64_x86_64_set_tls_module_base (struct bfd_link_info *info)
2572 {
2573 struct elf64_x86_64_link_hash_table *htab;
2574 struct bfd_link_hash_entry *base;
2575
2576 if (!info->executable)
2577 return;
2578
2579 htab = elf64_x86_64_hash_table (info);
2580 if (htab == NULL)
2581 return;
2582
2583 base = htab->tls_module_base;
2584 if (base == NULL)
2585 return;
2586
2587 base->u.def.value = htab->elf.tls_size;
2588 }
2589
2590 /* Return the base VMA address which should be subtracted from real addresses
2591 when resolving @dtpoff relocation.
2592 This is PT_TLS segment p_vaddr. */
2593
2594 static bfd_vma
2595 elf64_x86_64_dtpoff_base (struct bfd_link_info *info)
2596 {
2597 /* If tls_sec is NULL, we should have signalled an error already. */
2598 if (elf_hash_table (info)->tls_sec == NULL)
2599 return 0;
2600 return elf_hash_table (info)->tls_sec->vma;
2601 }
2602
2603 /* Return the relocation value for @tpoff relocation
2604 if STT_TLS virtual address is ADDRESS. */
2605
2606 static bfd_vma
2607 elf64_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
2608 {
2609 struct elf_link_hash_table *htab = elf_hash_table (info);
2610 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2611 bfd_vma static_tls_size;
2612
2613 /* If tls_segment is NULL, we should have signalled an error already. */
2614 if (htab->tls_sec == NULL)
2615 return 0;
2616
2617 /* Consider special static TLS alignment requirements. */
2618 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2619 return address - static_tls_size - htab->tls_sec->vma;
2620 }
2621
2622 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2623 branch? */
2624
2625 static bfd_boolean
2626 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
2627 {
2628 /* Opcode Instruction
2629 0xe8 call
2630 0xe9 jump
2631 0x0f 0x8x conditional jump */
2632 return ((offset > 0
2633 && (contents [offset - 1] == 0xe8
2634 || contents [offset - 1] == 0xe9))
2635 || (offset > 1
2636 && contents [offset - 2] == 0x0f
2637 && (contents [offset - 1] & 0xf0) == 0x80));
2638 }
2639
2640 static void
2641 elf64_x86_64_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
2642 {
2643 bfd_byte *loc = s->contents;
2644 loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
2645 BFD_ASSERT (loc + sizeof (Elf64_External_Rela)
2646 <= s->contents + s->size);
2647 bfd_elf64_swap_reloca_out (abfd, rel, loc);
2648 }
2649
2650 /* Relocate an x86_64 ELF section. */
2651
2652 static bfd_boolean
2653 elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
2654 bfd *input_bfd, asection *input_section,
2655 bfd_byte *contents, Elf_Internal_Rela *relocs,
2656 Elf_Internal_Sym *local_syms,
2657 asection **local_sections)
2658 {
2659 struct elf64_x86_64_link_hash_table *htab;
2660 Elf_Internal_Shdr *symtab_hdr;
2661 struct elf_link_hash_entry **sym_hashes;
2662 bfd_vma *local_got_offsets;
2663 bfd_vma *local_tlsdesc_gotents;
2664 Elf_Internal_Rela *rel;
2665 Elf_Internal_Rela *relend;
2666
2667 BFD_ASSERT (is_x86_64_elf (input_bfd));
2668
2669 htab = elf64_x86_64_hash_table (info);
2670 if (htab == NULL)
2671 return FALSE;
2672 symtab_hdr = &elf_symtab_hdr (input_bfd);
2673 sym_hashes = elf_sym_hashes (input_bfd);
2674 local_got_offsets = elf_local_got_offsets (input_bfd);
2675 local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd);
2676
2677 elf64_x86_64_set_tls_module_base (info);
2678
2679 rel = relocs;
2680 relend = relocs + input_section->reloc_count;
2681 for (; rel < relend; rel++)
2682 {
2683 unsigned int r_type;
2684 reloc_howto_type *howto;
2685 unsigned long r_symndx;
2686 struct elf_link_hash_entry *h;
2687 Elf_Internal_Sym *sym;
2688 asection *sec;
2689 bfd_vma off, offplt;
2690 bfd_vma relocation;
2691 bfd_boolean unresolved_reloc;
2692 bfd_reloc_status_type r;
2693 int tls_type;
2694 asection *base_got;
2695
2696 r_type = ELF64_R_TYPE (rel->r_info);
2697 if (r_type == (int) R_X86_64_GNU_VTINHERIT
2698 || r_type == (int) R_X86_64_GNU_VTENTRY)
2699 continue;
2700
2701 if (r_type >= R_X86_64_max)
2702 {
2703 bfd_set_error (bfd_error_bad_value);
2704 return FALSE;
2705 }
2706
2707 howto = x86_64_elf_howto_table + r_type;
2708 r_symndx = ELF64_R_SYM (rel->r_info);
2709 h = NULL;
2710 sym = NULL;
2711 sec = NULL;
2712 unresolved_reloc = FALSE;
2713 if (r_symndx < symtab_hdr->sh_info)
2714 {
2715 sym = local_syms + r_symndx;
2716 sec = local_sections[r_symndx];
2717
2718 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
2719 &sec, rel);
2720
2721 /* Relocate against local STT_GNU_IFUNC symbol. */
2722 if (!info->relocatable
2723 && ELF64_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2724 {
2725 h = elf64_x86_64_get_local_sym_hash (htab, input_bfd,
2726 rel, FALSE);
2727 if (h == NULL)
2728 abort ();
2729
2730 /* Set STT_GNU_IFUNC symbol value. */
2731 h->root.u.def.value = sym->st_value;
2732 h->root.u.def.section = sec;
2733 }
2734 }
2735 else
2736 {
2737 bfd_boolean warned ATTRIBUTE_UNUSED;
2738
2739 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2740 r_symndx, symtab_hdr, sym_hashes,
2741 h, sec, relocation,
2742 unresolved_reloc, warned);
2743 }
2744
2745 if (sec != NULL && elf_discarded_section (sec))
2746 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2747 rel, relend, howto, contents);
2748
2749 if (info->relocatable)
2750 continue;
2751
2752 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2753 it here if it is defined in a non-shared object. */
2754 if (h != NULL
2755 && h->type == STT_GNU_IFUNC
2756 && h->def_regular)
2757 {
2758 asection *plt;
2759 bfd_vma plt_index;
2760 const char *name;
2761
2762 if ((input_section->flags & SEC_ALLOC) == 0
2763 || h->plt.offset == (bfd_vma) -1)
2764 abort ();
2765
2766 /* STT_GNU_IFUNC symbol must go through PLT. */
2767 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
2768 relocation = (plt->output_section->vma
2769 + plt->output_offset + h->plt.offset);
2770
2771 switch (r_type)
2772 {
2773 default:
2774 if (h->root.root.string)
2775 name = h->root.root.string;
2776 else
2777 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2778 NULL);
2779 (*_bfd_error_handler)
2780 (_("%B: relocation %s against STT_GNU_IFUNC "
2781 "symbol `%s' isn't handled by %s"), input_bfd,
2782 x86_64_elf_howto_table[r_type].name,
2783 name, __FUNCTION__);
2784 bfd_set_error (bfd_error_bad_value);
2785 return FALSE;
2786
2787 case R_X86_64_32S:
2788 if (info->shared)
2789 abort ();
2790 goto do_relocation;
2791
2792 case R_X86_64_64:
2793 if (rel->r_addend != 0)
2794 {
2795 if (h->root.root.string)
2796 name = h->root.root.string;
2797 else
2798 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
2799 sym, NULL);
2800 (*_bfd_error_handler)
2801 (_("%B: relocation %s against STT_GNU_IFUNC "
2802 "symbol `%s' has non-zero addend: %d"),
2803 input_bfd, x86_64_elf_howto_table[r_type].name,
2804 name, rel->r_addend);
2805 bfd_set_error (bfd_error_bad_value);
2806 return FALSE;
2807 }
2808
2809 /* Generate dynamic relcoation only when there is a
2810 non-GOF reference in a shared object. */
2811 if (info->shared && h->non_got_ref)
2812 {
2813 Elf_Internal_Rela outrel;
2814 asection *sreloc;
2815
2816 /* Need a dynamic relocation to get the real function
2817 address. */
2818 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2819 info,
2820 input_section,
2821 rel->r_offset);
2822 if (outrel.r_offset == (bfd_vma) -1
2823 || outrel.r_offset == (bfd_vma) -2)
2824 abort ();
2825
2826 outrel.r_offset += (input_section->output_section->vma
2827 + input_section->output_offset);
2828
2829 if (h->dynindx == -1
2830 || h->forced_local
2831 || info->executable)
2832 {
2833 /* This symbol is resolved locally. */
2834 outrel.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
2835 outrel.r_addend = (h->root.u.def.value
2836 + h->root.u.def.section->output_section->vma
2837 + h->root.u.def.section->output_offset);
2838 }
2839 else
2840 {
2841 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
2842 outrel.r_addend = 0;
2843 }
2844
2845 sreloc = htab->elf.irelifunc;
2846 elf64_x86_64_append_rela (output_bfd, sreloc, &outrel);
2847
2848 /* If this reloc is against an external symbol, we
2849 do not want to fiddle with the addend. Otherwise,
2850 we need to include the symbol value so that it
2851 becomes an addend for the dynamic reloc. For an
2852 internal symbol, we have updated addend. */
2853 continue;
2854 }
2855
2856 case R_X86_64_32:
2857 case R_X86_64_PC32:
2858 case R_X86_64_PC64:
2859 case R_X86_64_PLT32:
2860 goto do_relocation;
2861
2862 case R_X86_64_GOTPCREL:
2863 case R_X86_64_GOTPCREL64:
2864 base_got = htab->elf.sgot;
2865 off = h->got.offset;
2866
2867 if (base_got == NULL)
2868 abort ();
2869
2870 if (off == (bfd_vma) -1)
2871 {
2872 /* We can't use h->got.offset here to save state, or
2873 even just remember the offset, as finish_dynamic_symbol
2874 would use that as offset into .got. */
2875
2876 if (htab->elf.splt != NULL)
2877 {
2878 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2879 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2880 base_got = htab->elf.sgotplt;
2881 }
2882 else
2883 {
2884 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2885 off = plt_index * GOT_ENTRY_SIZE;
2886 base_got = htab->elf.igotplt;
2887 }
2888
2889 if (h->dynindx == -1
2890 || h->forced_local
2891 || info->symbolic)
2892 {
2893 /* This references the local defitionion. We must
2894 initialize this entry in the global offset table.
2895 Since the offset must always be a multiple of 8,
2896 we use the least significant bit to record
2897 whether we have initialized it already.
2898
2899 When doing a dynamic link, we create a .rela.got
2900 relocation entry to initialize the value. This
2901 is done in the finish_dynamic_symbol routine. */
2902 if ((off & 1) != 0)
2903 off &= ~1;
2904 else
2905 {
2906 bfd_put_64 (output_bfd, relocation,
2907 base_got->contents + off);
2908 /* Note that this is harmless for the GOTPLT64
2909 case, as -1 | 1 still is -1. */
2910 h->got.offset |= 1;
2911 }
2912 }
2913 }
2914
2915 relocation = (base_got->output_section->vma
2916 + base_got->output_offset + off);
2917
2918 if (r_type != R_X86_64_GOTPCREL
2919 && r_type != R_X86_64_GOTPCREL64)
2920 {
2921 asection *gotplt;
2922 if (htab->elf.splt != NULL)
2923 gotplt = htab->elf.sgotplt;
2924 else
2925 gotplt = htab->elf.igotplt;
2926 relocation -= (gotplt->output_section->vma
2927 - gotplt->output_offset);
2928 }
2929
2930 goto do_relocation;
2931 }
2932 }
2933
2934 /* When generating a shared object, the relocations handled here are
2935 copied into the output file to be resolved at run time. */
2936 switch (r_type)
2937 {
2938 case R_X86_64_GOT32:
2939 case R_X86_64_GOT64:
2940 /* Relocation is to the entry for this symbol in the global
2941 offset table. */
2942 case R_X86_64_GOTPCREL:
2943 case R_X86_64_GOTPCREL64:
2944 /* Use global offset table entry as symbol value. */
2945 case R_X86_64_GOTPLT64:
2946 /* This is the same as GOT64 for relocation purposes, but
2947 indicates the existence of a PLT entry. The difficulty is,
2948 that we must calculate the GOT slot offset from the PLT
2949 offset, if this symbol got a PLT entry (it was global).
2950 Additionally if it's computed from the PLT entry, then that
2951 GOT offset is relative to .got.plt, not to .got. */
2952 base_got = htab->elf.sgot;
2953
2954 if (htab->elf.sgot == NULL)
2955 abort ();
2956
2957 if (h != NULL)
2958 {
2959 bfd_boolean dyn;
2960
2961 off = h->got.offset;
2962 if (h->needs_plt
2963 && h->plt.offset != (bfd_vma)-1
2964 && off == (bfd_vma)-1)
2965 {
2966 /* We can't use h->got.offset here to save
2967 state, or even just remember the offset, as
2968 finish_dynamic_symbol would use that as offset into
2969 .got. */
2970 bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2971 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2972 base_got = htab->elf.sgotplt;
2973 }
2974
2975 dyn = htab->elf.dynamic_sections_created;
2976
2977 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2978 || (info->shared
2979 && SYMBOL_REFERENCES_LOCAL (info, h))
2980 || (ELF_ST_VISIBILITY (h->other)
2981 && h->root.type == bfd_link_hash_undefweak))
2982 {
2983 /* This is actually a static link, or it is a -Bsymbolic
2984 link and the symbol is defined locally, or the symbol
2985 was forced to be local because of a version file. We
2986 must initialize this entry in the global offset table.
2987 Since the offset must always be a multiple of 8, we
2988 use the least significant bit to record whether we
2989 have initialized it already.
2990
2991 When doing a dynamic link, we create a .rela.got
2992 relocation entry to initialize the value. This is
2993 done in the finish_dynamic_symbol routine. */
2994 if ((off & 1) != 0)
2995 off &= ~1;
2996 else
2997 {
2998 bfd_put_64 (output_bfd, relocation,
2999 base_got->contents + off);
3000 /* Note that this is harmless for the GOTPLT64 case,
3001 as -1 | 1 still is -1. */
3002 h->got.offset |= 1;
3003 }
3004 }
3005 else
3006 unresolved_reloc = FALSE;
3007 }
3008 else
3009 {
3010 if (local_got_offsets == NULL)
3011 abort ();
3012
3013 off = local_got_offsets[r_symndx];
3014
3015 /* The offset must always be a multiple of 8. We use
3016 the least significant bit to record whether we have
3017 already generated the necessary reloc. */
3018 if ((off & 1) != 0)
3019 off &= ~1;
3020 else
3021 {
3022 bfd_put_64 (output_bfd, relocation,
3023 base_got->contents + off);
3024
3025 if (info->shared)
3026 {
3027 asection *s;
3028 Elf_Internal_Rela outrel;
3029
3030 /* We need to generate a R_X86_64_RELATIVE reloc
3031 for the dynamic linker. */
3032 s = htab->elf.srelgot;
3033 if (s == NULL)
3034 abort ();
3035
3036 outrel.r_offset = (base_got->output_section->vma
3037 + base_got->output_offset
3038 + off);
3039 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3040 outrel.r_addend = relocation;
3041 elf64_x86_64_append_rela (output_bfd, s, &outrel);
3042 }
3043
3044 local_got_offsets[r_symndx] |= 1;
3045 }
3046 }
3047
3048 if (off >= (bfd_vma) -2)
3049 abort ();
3050
3051 relocation = base_got->output_section->vma
3052 + base_got->output_offset + off;
3053 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3054 relocation -= htab->elf.sgotplt->output_section->vma
3055 - htab->elf.sgotplt->output_offset;
3056
3057 break;
3058
3059 case R_X86_64_GOTOFF64:
3060 /* Relocation is relative to the start of the global offset
3061 table. */
3062
3063 /* Check to make sure it isn't a protected function symbol
3064 for shared library since it may not be local when used
3065 as function address. */
3066 if (info->shared
3067 && h
3068 && h->def_regular
3069 && h->type == STT_FUNC
3070 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3071 {
3072 (*_bfd_error_handler)
3073 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3074 input_bfd, h->root.root.string);
3075 bfd_set_error (bfd_error_bad_value);
3076 return FALSE;
3077 }
3078
3079 /* Note that sgot is not involved in this
3080 calculation. We always want the start of .got.plt. If we
3081 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3082 permitted by the ABI, we might have to change this
3083 calculation. */
3084 relocation -= htab->elf.sgotplt->output_section->vma
3085 + htab->elf.sgotplt->output_offset;
3086 break;
3087
3088 case R_X86_64_GOTPC32:
3089 case R_X86_64_GOTPC64:
3090 /* Use global offset table as symbol value. */
3091 relocation = htab->elf.sgotplt->output_section->vma
3092 + htab->elf.sgotplt->output_offset;
3093 unresolved_reloc = FALSE;
3094 break;
3095
3096 case R_X86_64_PLTOFF64:
3097 /* Relocation is PLT entry relative to GOT. For local
3098 symbols it's the symbol itself relative to GOT. */
3099 if (h != NULL
3100 /* See PLT32 handling. */
3101 && h->plt.offset != (bfd_vma) -1
3102 && htab->elf.splt != NULL)
3103 {
3104 relocation = (htab->elf.splt->output_section->vma
3105 + htab->elf.splt->output_offset
3106 + h->plt.offset);
3107 unresolved_reloc = FALSE;
3108 }
3109
3110 relocation -= htab->elf.sgotplt->output_section->vma
3111 + htab->elf.sgotplt->output_offset;
3112 break;
3113
3114 case R_X86_64_PLT32:
3115 /* Relocation is to the entry for this symbol in the
3116 procedure linkage table. */
3117
3118 /* Resolve a PLT32 reloc against a local symbol directly,
3119 without using the procedure linkage table. */
3120 if (h == NULL)
3121 break;
3122
3123 if (h->plt.offset == (bfd_vma) -1
3124 || htab->elf.splt == NULL)
3125 {
3126 /* We didn't make a PLT entry for this symbol. This
3127 happens when statically linking PIC code, or when
3128 using -Bsymbolic. */
3129 break;
3130 }
3131
3132 relocation = (htab->elf.splt->output_section->vma
3133 + htab->elf.splt->output_offset
3134 + h->plt.offset);
3135 unresolved_reloc = FALSE;
3136 break;
3137
3138 case R_X86_64_PC8:
3139 case R_X86_64_PC16:
3140 case R_X86_64_PC32:
3141 if (info->shared
3142 && (input_section->flags & SEC_ALLOC) != 0
3143 && (input_section->flags & SEC_READONLY) != 0
3144 && h != NULL)
3145 {
3146 bfd_boolean fail = FALSE;
3147 bfd_boolean branch
3148 = (r_type == R_X86_64_PC32
3149 && is_32bit_relative_branch (contents, rel->r_offset));
3150
3151 if (SYMBOL_REFERENCES_LOCAL (info, h))
3152 {
3153 /* Symbol is referenced locally. Make sure it is
3154 defined locally or for a branch. */
3155 fail = !h->def_regular && !branch;
3156 }
3157 else
3158 {
3159 /* Symbol isn't referenced locally. We only allow
3160 branch to symbol with non-default visibility. */
3161 fail = (!branch
3162 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3163 }
3164
3165 if (fail)
3166 {
3167 const char *fmt;
3168 const char *v;
3169 const char *pic = "";
3170
3171 switch (ELF_ST_VISIBILITY (h->other))
3172 {
3173 case STV_HIDDEN:
3174 v = _("hidden symbol");
3175 break;
3176 case STV_INTERNAL:
3177 v = _("internal symbol");
3178 break;
3179 case STV_PROTECTED:
3180 v = _("protected symbol");
3181 break;
3182 default:
3183 v = _("symbol");
3184 pic = _("; recompile with -fPIC");
3185 break;
3186 }
3187
3188 if (h->def_regular)
3189 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3190 else
3191 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3192
3193 (*_bfd_error_handler) (fmt, input_bfd,
3194 x86_64_elf_howto_table[r_type].name,
3195 v, h->root.root.string, pic);
3196 bfd_set_error (bfd_error_bad_value);
3197 return FALSE;
3198 }
3199 }
3200 /* Fall through. */
3201
3202 case R_X86_64_8:
3203 case R_X86_64_16:
3204 case R_X86_64_32:
3205 case R_X86_64_PC64:
3206 case R_X86_64_64:
3207 /* FIXME: The ABI says the linker should make sure the value is
3208 the same when it's zeroextended to 64 bit. */
3209
3210 if ((input_section->flags & SEC_ALLOC) == 0)
3211 break;
3212
3213 if ((info->shared
3214 && (h == NULL
3215 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3216 || h->root.type != bfd_link_hash_undefweak)
3217 && (! IS_X86_64_PCREL_TYPE (r_type)
3218 || ! SYMBOL_CALLS_LOCAL (info, h)))
3219 || (ELIMINATE_COPY_RELOCS
3220 && !info->shared
3221 && h != NULL
3222 && h->dynindx != -1
3223 && !h->non_got_ref
3224 && ((h->def_dynamic
3225 && !h->def_regular)
3226 || h->root.type == bfd_link_hash_undefweak
3227 || h->root.type == bfd_link_hash_undefined)))
3228 {
3229 Elf_Internal_Rela outrel;
3230 bfd_boolean skip, relocate;
3231 asection *sreloc;
3232
3233 /* When generating a shared object, these relocations
3234 are copied into the output file to be resolved at run
3235 time. */
3236 skip = FALSE;
3237 relocate = FALSE;
3238
3239 outrel.r_offset =
3240 _bfd_elf_section_offset (output_bfd, info, input_section,
3241 rel->r_offset);
3242 if (outrel.r_offset == (bfd_vma) -1)
3243 skip = TRUE;
3244 else if (outrel.r_offset == (bfd_vma) -2)
3245 skip = TRUE, relocate = TRUE;
3246
3247 outrel.r_offset += (input_section->output_section->vma
3248 + input_section->output_offset);
3249
3250 if (skip)
3251 memset (&outrel, 0, sizeof outrel);
3252
3253 /* h->dynindx may be -1 if this symbol was marked to
3254 become local. */
3255 else if (h != NULL
3256 && h->dynindx != -1
3257 && (IS_X86_64_PCREL_TYPE (r_type)
3258 || ! info->shared
3259 || ! SYMBOLIC_BIND (info, h)
3260 || ! h->def_regular))
3261 {
3262 outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
3263 outrel.r_addend = rel->r_addend;
3264 }
3265 else
3266 {
3267 /* This symbol is local, or marked to become local. */
3268 if (r_type == R_X86_64_64)
3269 {
3270 relocate = TRUE;
3271 outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3272 outrel.r_addend = relocation + rel->r_addend;
3273 }
3274 else
3275 {
3276 long sindx;
3277
3278 if (bfd_is_abs_section (sec))
3279 sindx = 0;
3280 else if (sec == NULL || sec->owner == NULL)
3281 {
3282 bfd_set_error (bfd_error_bad_value);
3283 return FALSE;
3284 }
3285 else
3286 {
3287 asection *osec;
3288
3289 /* We are turning this relocation into one
3290 against a section symbol. It would be
3291 proper to subtract the symbol's value,
3292 osec->vma, from the emitted reloc addend,
3293 but ld.so expects buggy relocs. */
3294 osec = sec->output_section;
3295 sindx = elf_section_data (osec)->dynindx;
3296 if (sindx == 0)
3297 {
3298 asection *oi = htab->elf.text_index_section;
3299 sindx = elf_section_data (oi)->dynindx;
3300 }
3301 BFD_ASSERT (sindx != 0);
3302 }
3303
3304 outrel.r_info = ELF64_R_INFO (sindx, r_type);
3305 outrel.r_addend = relocation + rel->r_addend;
3306 }
3307 }
3308
3309 sreloc = elf_section_data (input_section)->sreloc;
3310
3311 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3312
3313 elf64_x86_64_append_rela (output_bfd, sreloc, &outrel);
3314
3315 /* If this reloc is against an external symbol, we do
3316 not want to fiddle with the addend. Otherwise, we
3317 need to include the symbol value so that it becomes
3318 an addend for the dynamic reloc. */
3319 if (! relocate)
3320 continue;
3321 }
3322
3323 break;
3324
3325 case R_X86_64_TLSGD:
3326 case R_X86_64_GOTPC32_TLSDESC:
3327 case R_X86_64_TLSDESC_CALL:
3328 case R_X86_64_GOTTPOFF:
3329 tls_type = GOT_UNKNOWN;
3330 if (h == NULL && local_got_offsets)
3331 tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3332 else if (h != NULL)
3333 tls_type = elf64_x86_64_hash_entry (h)->tls_type;
3334
3335 if (! elf64_x86_64_tls_transition (info, input_bfd,
3336 input_section, contents,
3337 symtab_hdr, sym_hashes,
3338 &r_type, tls_type, rel,
3339 relend, h, r_symndx))
3340 return FALSE;
3341
3342 if (r_type == R_X86_64_TPOFF32)
3343 {
3344 bfd_vma roff = rel->r_offset;
3345
3346 BFD_ASSERT (! unresolved_reloc);
3347
3348 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3349 {
3350 /* GD->LE transition.
3351 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3352 .word 0x6666; rex64; call __tls_get_addr
3353 Change it into:
3354 movq %fs:0, %rax
3355 leaq foo@tpoff(%rax), %rax */
3356 memcpy (contents + roff - 4,
3357 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3358 16);
3359 bfd_put_32 (output_bfd,
3360 elf64_x86_64_tpoff (info, relocation),
3361 contents + roff + 8);
3362 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3363 rel++;
3364 continue;
3365 }
3366 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3367 {
3368 /* GDesc -> LE transition.
3369 It's originally something like:
3370 leaq x@tlsdesc(%rip), %rax
3371
3372 Change it to:
3373 movl $x@tpoff, %rax. */
3374
3375 unsigned int val, type;
3376
3377 type = bfd_get_8 (input_bfd, contents + roff - 3);
3378 val = bfd_get_8 (input_bfd, contents + roff - 1);
3379 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3380 contents + roff - 3);
3381 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3382 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3383 contents + roff - 1);
3384 bfd_put_32 (output_bfd,
3385 elf64_x86_64_tpoff (info, relocation),
3386 contents + roff);
3387 continue;
3388 }
3389 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3390 {
3391 /* GDesc -> LE transition.
3392 It's originally:
3393 call *(%rax)
3394 Turn it into:
3395 xchg %ax,%ax. */
3396 bfd_put_8 (output_bfd, 0x66, contents + roff);
3397 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3398 continue;
3399 }
3400 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
3401 {
3402 /* IE->LE transition:
3403 Originally it can be one of:
3404 movq foo@gottpoff(%rip), %reg
3405 addq foo@gottpoff(%rip), %reg
3406 We change it into:
3407 movq $foo, %reg
3408 leaq foo(%reg), %reg
3409 addq $foo, %reg. */
3410
3411 unsigned int val, type, reg;
3412
3413 val = bfd_get_8 (input_bfd, contents + roff - 3);
3414 type = bfd_get_8 (input_bfd, contents + roff - 2);
3415 reg = bfd_get_8 (input_bfd, contents + roff - 1);
3416 reg >>= 3;
3417 if (type == 0x8b)
3418 {
3419 /* movq */
3420 if (val == 0x4c)
3421 bfd_put_8 (output_bfd, 0x49,
3422 contents + roff - 3);
3423 bfd_put_8 (output_bfd, 0xc7,
3424 contents + roff - 2);
3425 bfd_put_8 (output_bfd, 0xc0 | reg,
3426 contents + roff - 1);
3427 }
3428 else if (reg == 4)
3429 {
3430 /* addq -> addq - addressing with %rsp/%r12 is
3431 special */
3432 if (val == 0x4c)
3433 bfd_put_8 (output_bfd, 0x49,
3434 contents + roff - 3);
3435 bfd_put_8 (output_bfd, 0x81,
3436 contents + roff - 2);
3437 bfd_put_8 (output_bfd, 0xc0 | reg,
3438 contents + roff - 1);
3439 }
3440 else
3441 {
3442 /* addq -> leaq */
3443 if (val == 0x4c)
3444 bfd_put_8 (output_bfd, 0x4d,
3445 contents + roff - 3);
3446 bfd_put_8 (output_bfd, 0x8d,
3447 contents + roff - 2);
3448 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
3449 contents + roff - 1);
3450 }
3451 bfd_put_32 (output_bfd,
3452 elf64_x86_64_tpoff (info, relocation),
3453 contents + roff);
3454 continue;
3455 }
3456 else
3457 BFD_ASSERT (FALSE);
3458 }
3459
3460 if (htab->elf.sgot == NULL)
3461 abort ();
3462
3463 if (h != NULL)
3464 {
3465 off = h->got.offset;
3466 offplt = elf64_x86_64_hash_entry (h)->tlsdesc_got;
3467 }
3468 else
3469 {
3470 if (local_got_offsets == NULL)
3471 abort ();
3472
3473 off = local_got_offsets[r_symndx];
3474 offplt = local_tlsdesc_gotents[r_symndx];
3475 }
3476
3477 if ((off & 1) != 0)
3478 off &= ~1;
3479 else
3480 {
3481 Elf_Internal_Rela outrel;
3482 int dr_type, indx;
3483 asection *sreloc;
3484
3485 if (htab->elf.srelgot == NULL)
3486 abort ();
3487
3488 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3489
3490 if (GOT_TLS_GDESC_P (tls_type))
3491 {
3492 outrel.r_info = ELF64_R_INFO (indx, R_X86_64_TLSDESC);
3493 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
3494 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
3495 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3496 + htab->elf.sgotplt->output_offset
3497 + offplt
3498 + htab->sgotplt_jump_table_size);
3499 sreloc = htab->elf.srelplt;
3500 if (indx == 0)
3501 outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
3502 else
3503 outrel.r_addend = 0;
3504 elf64_x86_64_append_rela (output_bfd, sreloc, &outrel);
3505 }
3506
3507 sreloc = htab->elf.srelgot;
3508
3509 outrel.r_offset = (htab->elf.sgot->output_section->vma
3510 + htab->elf.sgot->output_offset + off);
3511
3512 if (GOT_TLS_GD_P (tls_type))
3513 dr_type = R_X86_64_DTPMOD64;
3514 else if (GOT_TLS_GDESC_P (tls_type))
3515 goto dr_done;
3516 else
3517 dr_type = R_X86_64_TPOFF64;
3518
3519 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
3520 outrel.r_addend = 0;
3521 if ((dr_type == R_X86_64_TPOFF64
3522 || dr_type == R_X86_64_TLSDESC) && indx == 0)
3523 outrel.r_addend = relocation - elf64_x86_64_dtpoff_base (info);
3524 outrel.r_info = ELF64_R_INFO (indx, dr_type);
3525
3526 elf64_x86_64_append_rela (output_bfd, sreloc, &outrel);
3527
3528 if (GOT_TLS_GD_P (tls_type))
3529 {
3530 if (indx == 0)
3531 {
3532 BFD_ASSERT (! unresolved_reloc);
3533 bfd_put_64 (output_bfd,
3534 relocation - elf64_x86_64_dtpoff_base (info),
3535 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3536 }
3537 else
3538 {
3539 bfd_put_64 (output_bfd, 0,
3540 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3541 outrel.r_info = ELF64_R_INFO (indx,
3542 R_X86_64_DTPOFF64);
3543 outrel.r_offset += GOT_ENTRY_SIZE;
3544 elf64_x86_64_append_rela (output_bfd, sreloc,
3545 &outrel);
3546 }
3547 }
3548
3549 dr_done:
3550 if (h != NULL)
3551 h->got.offset |= 1;
3552 else
3553 local_got_offsets[r_symndx] |= 1;
3554 }
3555
3556 if (off >= (bfd_vma) -2
3557 && ! GOT_TLS_GDESC_P (tls_type))
3558 abort ();
3559 if (r_type == ELF64_R_TYPE (rel->r_info))
3560 {
3561 if (r_type == R_X86_64_GOTPC32_TLSDESC
3562 || r_type == R_X86_64_TLSDESC_CALL)
3563 relocation = htab->elf.sgotplt->output_section->vma
3564 + htab->elf.sgotplt->output_offset
3565 + offplt + htab->sgotplt_jump_table_size;
3566 else
3567 relocation = htab->elf.sgot->output_section->vma
3568 + htab->elf.sgot->output_offset + off;
3569 unresolved_reloc = FALSE;
3570 }
3571 else
3572 {
3573 bfd_vma roff = rel->r_offset;
3574
3575 if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3576 {
3577 /* GD->IE transition.
3578 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3579 .word 0x6666; rex64; call __tls_get_addr@plt
3580 Change it into:
3581 movq %fs:0, %rax
3582 addq foo@gottpoff(%rip), %rax */
3583 memcpy (contents + roff - 4,
3584 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3585 16);
3586
3587 relocation = (htab->elf.sgot->output_section->vma
3588 + htab->elf.sgot->output_offset + off
3589 - roff
3590 - input_section->output_section->vma
3591 - input_section->output_offset
3592 - 12);
3593 bfd_put_32 (output_bfd, relocation,
3594 contents + roff + 8);
3595 /* Skip R_X86_64_PLT32. */
3596 rel++;
3597 continue;
3598 }
3599 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3600 {
3601 /* GDesc -> IE transition.
3602 It's originally something like:
3603 leaq x@tlsdesc(%rip), %rax
3604
3605 Change it to:
3606 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
3607
3608 /* Now modify the instruction as appropriate. To
3609 turn a leaq into a movq in the form we use it, it
3610 suffices to change the second byte from 0x8d to
3611 0x8b. */
3612 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3613
3614 bfd_put_32 (output_bfd,
3615 htab->elf.sgot->output_section->vma
3616 + htab->elf.sgot->output_offset + off
3617 - rel->r_offset
3618 - input_section->output_section->vma
3619 - input_section->output_offset
3620 - 4,
3621 contents + roff);
3622 continue;
3623 }
3624 else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3625 {
3626 /* GDesc -> IE transition.
3627 It's originally:
3628 call *(%rax)
3629
3630 Change it to:
3631 xchg %ax, %ax. */
3632
3633 bfd_put_8 (output_bfd, 0x66, contents + roff);
3634 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3635 continue;
3636 }
3637 else
3638 BFD_ASSERT (FALSE);
3639 }
3640 break;
3641
3642 case R_X86_64_TLSLD:
3643 if (! elf64_x86_64_tls_transition (info, input_bfd,
3644 input_section, contents,
3645 symtab_hdr, sym_hashes,
3646 &r_type, GOT_UNKNOWN,
3647 rel, relend, h, r_symndx))
3648 return FALSE;
3649
3650 if (r_type != R_X86_64_TLSLD)
3651 {
3652 /* LD->LE transition:
3653 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3654 We change it into:
3655 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3656
3657 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
3658 memcpy (contents + rel->r_offset - 3,
3659 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3660 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3661 rel++;
3662 continue;
3663 }
3664
3665 if (htab->elf.sgot == NULL)
3666 abort ();
3667
3668 off = htab->tls_ld_got.offset;
3669 if (off & 1)
3670 off &= ~1;
3671 else
3672 {
3673 Elf_Internal_Rela outrel;
3674
3675 if (htab->elf.srelgot == NULL)
3676 abort ();
3677
3678 outrel.r_offset = (htab->elf.sgot->output_section->vma
3679 + htab->elf.sgot->output_offset + off);
3680
3681 bfd_put_64 (output_bfd, 0,
3682 htab->elf.sgot->contents + off);
3683 bfd_put_64 (output_bfd, 0,
3684 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3685 outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64);
3686 outrel.r_addend = 0;
3687 elf64_x86_64_append_rela (output_bfd, htab->elf.srelgot,
3688 &outrel);
3689 htab->tls_ld_got.offset |= 1;
3690 }
3691 relocation = htab->elf.sgot->output_section->vma
3692 + htab->elf.sgot->output_offset + off;
3693 unresolved_reloc = FALSE;
3694 break;
3695
3696 case R_X86_64_DTPOFF32:
3697 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
3698 relocation -= elf64_x86_64_dtpoff_base (info);
3699 else
3700 relocation = elf64_x86_64_tpoff (info, relocation);
3701 break;
3702
3703 case R_X86_64_TPOFF32:
3704 BFD_ASSERT (info->executable);
3705 relocation = elf64_x86_64_tpoff (info, relocation);
3706 break;
3707
3708 default:
3709 break;
3710 }
3711
3712 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3713 because such sections are not SEC_ALLOC and thus ld.so will
3714 not process them. */
3715 if (unresolved_reloc
3716 && !((input_section->flags & SEC_DEBUGGING) != 0
3717 && h->def_dynamic))
3718 (*_bfd_error_handler)
3719 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3720 input_bfd,
3721 input_section,
3722 (long) rel->r_offset,
3723 howto->name,
3724 h->root.root.string);
3725
3726 do_relocation:
3727 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3728 contents, rel->r_offset,
3729 relocation, rel->r_addend);
3730
3731 if (r != bfd_reloc_ok)
3732 {
3733 const char *name;
3734
3735 if (h != NULL)
3736 name = h->root.root.string;
3737 else
3738 {
3739 name = bfd_elf_string_from_elf_section (input_bfd,
3740 symtab_hdr->sh_link,
3741 sym->st_name);
3742 if (name == NULL)
3743 return FALSE;
3744 if (*name == '\0')
3745 name = bfd_section_name (input_bfd, sec);
3746 }
3747
3748 if (r == bfd_reloc_overflow)
3749 {
3750 if (! ((*info->callbacks->reloc_overflow)
3751 (info, (h ? &h->root : NULL), name, howto->name,
3752 (bfd_vma) 0, input_bfd, input_section,
3753 rel->r_offset)))
3754 return FALSE;
3755 }
3756 else
3757 {
3758 (*_bfd_error_handler)
3759 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3760 input_bfd, input_section,
3761 (long) rel->r_offset, name, (int) r);
3762 return FALSE;
3763 }
3764 }
3765 }
3766
3767 return TRUE;
3768 }
3769
3770 /* Finish up dynamic symbol handling. We set the contents of various
3771 dynamic sections here. */
3772
3773 static bfd_boolean
3774 elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd,
3775 struct bfd_link_info *info,
3776 struct elf_link_hash_entry *h,
3777 Elf_Internal_Sym *sym)
3778 {
3779 struct elf64_x86_64_link_hash_table *htab;
3780
3781 htab = elf64_x86_64_hash_table (info);
3782 if (htab == NULL)
3783 return FALSE;
3784
3785 if (h->plt.offset != (bfd_vma) -1)
3786 {
3787 bfd_vma plt_index;
3788 bfd_vma got_offset;
3789 Elf_Internal_Rela rela;
3790 bfd_byte *loc;
3791 asection *plt, *gotplt, *relplt;
3792
3793 /* When building a static executable, use .iplt, .igot.plt and
3794 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3795 if (htab->elf.splt != NULL)
3796 {
3797 plt = htab->elf.splt;
3798 gotplt = htab->elf.sgotplt;
3799 relplt = htab->elf.srelplt;
3800 }
3801 else
3802 {
3803 plt = htab->elf.iplt;
3804 gotplt = htab->elf.igotplt;
3805 relplt = htab->elf.irelplt;
3806 }
3807
3808 /* This symbol has an entry in the procedure linkage table. Set
3809 it up. */
3810 if ((h->dynindx == -1
3811 && !((h->forced_local || info->executable)
3812 && h->def_regular
3813 && h->type == STT_GNU_IFUNC))
3814 || plt == NULL
3815 || gotplt == NULL
3816 || relplt == NULL)
3817 abort ();
3818
3819 /* Get the index in the procedure linkage table which
3820 corresponds to this symbol. This is the index of this symbol
3821 in all the symbols for which we are making plt entries. The
3822 first entry in the procedure linkage table is reserved.
3823
3824 Get the offset into the .got table of the entry that
3825 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3826 bytes. The first three are reserved for the dynamic linker.
3827
3828 For static executables, we don't reserve anything. */
3829
3830 if (plt == htab->elf.splt)
3831 {
3832 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3833 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3834 }
3835 else
3836 {
3837 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3838 got_offset = plt_index * GOT_ENTRY_SIZE;
3839 }
3840
3841 /* Fill in the entry in the procedure linkage table. */
3842 memcpy (plt->contents + h->plt.offset, elf64_x86_64_plt_entry,
3843 PLT_ENTRY_SIZE);
3844
3845 /* Insert the relocation positions of the plt section. The magic
3846 numbers at the end of the statements are the positions of the
3847 relocations in the plt section. */
3848 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3849 instruction uses 6 bytes, subtract this value. */
3850 bfd_put_32 (output_bfd,
3851 (gotplt->output_section->vma
3852 + gotplt->output_offset
3853 + got_offset
3854 - plt->output_section->vma
3855 - plt->output_offset
3856 - h->plt.offset
3857 - 6),
3858 plt->contents + h->plt.offset + 2);
3859
3860 /* Don't fill PLT entry for static executables. */
3861 if (plt == htab->elf.splt)
3862 {
3863 /* Put relocation index. */
3864 bfd_put_32 (output_bfd, plt_index,
3865 plt->contents + h->plt.offset + 7);
3866 /* Put offset for jmp .PLT0. */
3867 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3868 plt->contents + h->plt.offset + 12);
3869 }
3870
3871 /* Fill in the entry in the global offset table, initially this
3872 points to the pushq instruction in the PLT which is at offset 6. */
3873 bfd_put_64 (output_bfd, (plt->output_section->vma
3874 + plt->output_offset
3875 + h->plt.offset + 6),
3876 gotplt->contents + got_offset);
3877
3878 /* Fill in the entry in the .rela.plt section. */
3879 rela.r_offset = (gotplt->output_section->vma
3880 + gotplt->output_offset
3881 + got_offset);
3882 if (h->dynindx == -1
3883 || ((info->executable
3884 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3885 && h->def_regular
3886 && h->type == STT_GNU_IFUNC))
3887 {
3888 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3889 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
3890 rela.r_info = ELF64_R_INFO (0, R_X86_64_IRELATIVE);
3891 rela.r_addend = (h->root.u.def.value
3892 + h->root.u.def.section->output_section->vma
3893 + h->root.u.def.section->output_offset);
3894 }
3895 else
3896 {
3897 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
3898 rela.r_addend = 0;
3899 }
3900 loc = relplt->contents + plt_index * sizeof (Elf64_External_Rela);
3901 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
3902
3903 if (!h->def_regular)
3904 {
3905 /* Mark the symbol as undefined, rather than as defined in
3906 the .plt section. Leave the value if there were any
3907 relocations where pointer equality matters (this is a clue
3908 for the dynamic linker, to make function pointer
3909 comparisons work between an application and shared
3910 library), otherwise set it to zero. If a function is only
3911 called from a binary, there is no need to slow down
3912 shared libraries because of that. */
3913 sym->st_shndx = SHN_UNDEF;
3914 if (!h->pointer_equality_needed)
3915 sym->st_value = 0;
3916 }
3917 }
3918
3919 if (h->got.offset != (bfd_vma) -1
3920 && ! GOT_TLS_GD_ANY_P (elf64_x86_64_hash_entry (h)->tls_type)
3921 && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
3922 {
3923 Elf_Internal_Rela rela;
3924
3925 /* This symbol has an entry in the global offset table. Set it
3926 up. */
3927 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3928 abort ();
3929
3930 rela.r_offset = (htab->elf.sgot->output_section->vma
3931 + htab->elf.sgot->output_offset
3932 + (h->got.offset &~ (bfd_vma) 1));
3933
3934 /* If this is a static link, or it is a -Bsymbolic link and the
3935 symbol is defined locally or was forced to be local because
3936 of a version file, we just want to emit a RELATIVE reloc.
3937 The entry in the global offset table will already have been
3938 initialized in the relocate_section function. */
3939 if (h->def_regular
3940 && h->type == STT_GNU_IFUNC)
3941 {
3942 if (info->shared)
3943 {
3944 /* Generate R_X86_64_GLOB_DAT. */
3945 goto do_glob_dat;
3946 }
3947 else
3948 {
3949 asection *plt;
3950
3951 if (!h->pointer_equality_needed)
3952 abort ();
3953
3954 /* For non-shared object, we can't use .got.plt, which
3955 contains the real function addres if we need pointer
3956 equality. We load the GOT entry with the PLT entry. */
3957 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3958 bfd_put_64 (output_bfd, (plt->output_section->vma
3959 + plt->output_offset
3960 + h->plt.offset),
3961 htab->elf.sgot->contents + h->got.offset);
3962 return TRUE;
3963 }
3964 }
3965 else if (info->shared
3966 && SYMBOL_REFERENCES_LOCAL (info, h))
3967 {
3968 if (!h->def_regular)
3969 return FALSE;
3970 BFD_ASSERT((h->got.offset & 1) != 0);
3971 rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
3972 rela.r_addend = (h->root.u.def.value
3973 + h->root.u.def.section->output_section->vma
3974 + h->root.u.def.section->output_offset);
3975 }
3976 else
3977 {
3978 BFD_ASSERT((h->got.offset & 1) == 0);
3979 do_glob_dat:
3980 bfd_put_64 (output_bfd, (bfd_vma) 0,
3981 htab->elf.sgot->contents + h->got.offset);
3982 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT);
3983 rela.r_addend = 0;
3984 }
3985
3986 elf64_x86_64_append_rela (output_bfd, htab->elf.srelgot, &rela);
3987 }
3988
3989 if (h->needs_copy)
3990 {
3991 Elf_Internal_Rela rela;
3992
3993 /* This symbol needs a copy reloc. Set it up. */
3994
3995 if (h->dynindx == -1
3996 || (h->root.type != bfd_link_hash_defined
3997 && h->root.type != bfd_link_hash_defweak)
3998 || htab->srelbss == NULL)
3999 abort ();
4000
4001 rela.r_offset = (h->root.u.def.value
4002 + h->root.u.def.section->output_section->vma
4003 + h->root.u.def.section->output_offset);
4004 rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
4005 rela.r_addend = 0;
4006 elf64_x86_64_append_rela (output_bfd, htab->srelbss, &rela);
4007 }
4008
4009 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4010 be NULL for local symbols. */
4011 if (sym != NULL
4012 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
4013 || h == htab->elf.hgot))
4014 sym->st_shndx = SHN_ABS;
4015
4016 return TRUE;
4017 }
4018
4019 /* Finish up local dynamic symbol handling. We set the contents of
4020 various dynamic sections here. */
4021
4022 static bfd_boolean
4023 elf64_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
4024 {
4025 struct elf_link_hash_entry *h
4026 = (struct elf_link_hash_entry *) *slot;
4027 struct bfd_link_info *info
4028 = (struct bfd_link_info *) inf;
4029
4030 return elf64_x86_64_finish_dynamic_symbol (info->output_bfd,
4031 info, h, NULL);
4032 }
4033
4034 /* Used to decide how to sort relocs in an optimal manner for the
4035 dynamic linker, before writing them out. */
4036
4037 static enum elf_reloc_type_class
4038 elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
4039 {
4040 switch ((int) ELF64_R_TYPE (rela->r_info))
4041 {
4042 case R_X86_64_RELATIVE:
4043 return reloc_class_relative;
4044 case R_X86_64_JUMP_SLOT:
4045 return reloc_class_plt;
4046 case R_X86_64_COPY:
4047 return reloc_class_copy;
4048 default:
4049 return reloc_class_normal;
4050 }
4051 }
4052
4053 /* Finish up the dynamic sections. */
4054
4055 static bfd_boolean
4056 elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
4057 {
4058 struct elf64_x86_64_link_hash_table *htab;
4059 bfd *dynobj;
4060 asection *sdyn;
4061
4062 htab = elf64_x86_64_hash_table (info);
4063 if (htab == NULL)
4064 return FALSE;
4065
4066 dynobj = htab->elf.dynobj;
4067 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4068
4069 if (htab->elf.dynamic_sections_created)
4070 {
4071 Elf64_External_Dyn *dyncon, *dynconend;
4072
4073 if (sdyn == NULL || htab->elf.sgot == NULL)
4074 abort ();
4075
4076 dyncon = (Elf64_External_Dyn *) sdyn->contents;
4077 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
4078 for (; dyncon < dynconend; dyncon++)
4079 {
4080 Elf_Internal_Dyn dyn;
4081 asection *s;
4082
4083 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
4084
4085 switch (dyn.d_tag)
4086 {
4087 default:
4088 continue;
4089
4090 case DT_PLTGOT:
4091 s = htab->elf.sgotplt;
4092 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4093 break;
4094
4095 case DT_JMPREL:
4096 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4097 break;
4098
4099 case DT_PLTRELSZ:
4100 s = htab->elf.srelplt->output_section;
4101 dyn.d_un.d_val = s->size;
4102 break;
4103
4104 case DT_RELASZ:
4105 /* The procedure linkage table relocs (DT_JMPREL) should
4106 not be included in the overall relocs (DT_RELA).
4107 Therefore, we override the DT_RELASZ entry here to
4108 make it not include the JMPREL relocs. Since the
4109 linker script arranges for .rela.plt to follow all
4110 other relocation sections, we don't have to worry
4111 about changing the DT_RELA entry. */
4112 if (htab->elf.srelplt != NULL)
4113 {
4114 s = htab->elf.srelplt->output_section;
4115 dyn.d_un.d_val -= s->size;
4116 }
4117 break;
4118
4119 case DT_TLSDESC_PLT:
4120 s = htab->elf.splt;
4121 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4122 + htab->tlsdesc_plt;
4123 break;
4124
4125 case DT_TLSDESC_GOT:
4126 s = htab->elf.sgot;
4127 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4128 + htab->tlsdesc_got;
4129 break;
4130 }
4131
4132 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
4133 }
4134
4135 /* Fill in the special first entry in the procedure linkage table. */
4136 if (htab->elf.splt && htab->elf.splt->size > 0)
4137 {
4138 /* Fill in the first entry in the procedure linkage table. */
4139 memcpy (htab->elf.splt->contents, elf64_x86_64_plt0_entry,
4140 PLT_ENTRY_SIZE);
4141 /* Add offset for pushq GOT+8(%rip), since the instruction
4142 uses 6 bytes subtract this value. */
4143 bfd_put_32 (output_bfd,
4144 (htab->elf.sgotplt->output_section->vma
4145 + htab->elf.sgotplt->output_offset
4146 + 8
4147 - htab->elf.splt->output_section->vma
4148 - htab->elf.splt->output_offset
4149 - 6),
4150 htab->elf.splt->contents + 2);
4151 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4152 the end of the instruction. */
4153 bfd_put_32 (output_bfd,
4154 (htab->elf.sgotplt->output_section->vma
4155 + htab->elf.sgotplt->output_offset
4156 + 16
4157 - htab->elf.splt->output_section->vma
4158 - htab->elf.splt->output_offset
4159 - 12),
4160 htab->elf.splt->contents + 8);
4161
4162 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize =
4163 PLT_ENTRY_SIZE;
4164
4165 if (htab->tlsdesc_plt)
4166 {
4167 bfd_put_64 (output_bfd, (bfd_vma) 0,
4168 htab->elf.sgot->contents + htab->tlsdesc_got);
4169
4170 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4171 elf64_x86_64_plt0_entry,
4172 PLT_ENTRY_SIZE);
4173
4174 /* Add offset for pushq GOT+8(%rip), since the
4175 instruction uses 6 bytes subtract this value. */
4176 bfd_put_32 (output_bfd,
4177 (htab->elf.sgotplt->output_section->vma
4178 + htab->elf.sgotplt->output_offset
4179 + 8
4180 - htab->elf.splt->output_section->vma
4181 - htab->elf.splt->output_offset
4182 - htab->tlsdesc_plt
4183 - 6),
4184 htab->elf.splt->contents + htab->tlsdesc_plt + 2);
4185 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4186 htab->tlsdesc_got. The 12 is the offset to the end of
4187 the instruction. */
4188 bfd_put_32 (output_bfd,
4189 (htab->elf.sgot->output_section->vma
4190 + htab->elf.sgot->output_offset
4191 + htab->tlsdesc_got
4192 - htab->elf.splt->output_section->vma
4193 - htab->elf.splt->output_offset
4194 - htab->tlsdesc_plt
4195 - 12),
4196 htab->elf.splt->contents + htab->tlsdesc_plt + 8);
4197 }
4198 }
4199 }
4200
4201 if (htab->elf.sgotplt)
4202 {
4203 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4204 {
4205 (*_bfd_error_handler)
4206 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4207 return FALSE;
4208 }
4209
4210 /* Fill in the first three entries in the global offset table. */
4211 if (htab->elf.sgotplt->size > 0)
4212 {
4213 /* Set the first entry in the global offset table to the address of
4214 the dynamic section. */
4215 if (sdyn == NULL)
4216 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4217 else
4218 bfd_put_64 (output_bfd,
4219 sdyn->output_section->vma + sdyn->output_offset,
4220 htab->elf.sgotplt->contents);
4221 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4222 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4223 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4224 }
4225
4226 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
4227 GOT_ENTRY_SIZE;
4228 }
4229
4230 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4231 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
4232 = GOT_ENTRY_SIZE;
4233
4234 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4235 htab_traverse (htab->loc_hash_table,
4236 elf64_x86_64_finish_local_dynamic_symbol,
4237 info);
4238
4239 return TRUE;
4240 }
4241
4242 /* Return address for Ith PLT stub in section PLT, for relocation REL
4243 or (bfd_vma) -1 if it should not be included. */
4244
4245 static bfd_vma
4246 elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4247 const arelent *rel ATTRIBUTE_UNUSED)
4248 {
4249 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4250 }
4251
4252 /* Handle an x86-64 specific section when reading an object file. This
4253 is called when elfcode.h finds a section with an unknown type. */
4254
4255 static bfd_boolean
4256 elf64_x86_64_section_from_shdr (bfd *abfd,
4257 Elf_Internal_Shdr *hdr,
4258 const char *name,
4259 int shindex)
4260 {
4261 if (hdr->sh_type != SHT_X86_64_UNWIND)
4262 return FALSE;
4263
4264 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4265 return FALSE;
4266
4267 return TRUE;
4268 }
4269
4270 /* Hook called by the linker routine which adds symbols from an object
4271 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4272 of .bss. */
4273
4274 static bfd_boolean
4275 elf64_x86_64_add_symbol_hook (bfd *abfd,
4276 struct bfd_link_info *info,
4277 Elf_Internal_Sym *sym,
4278 const char **namep ATTRIBUTE_UNUSED,
4279 flagword *flagsp ATTRIBUTE_UNUSED,
4280 asection **secp,
4281 bfd_vma *valp)
4282 {
4283 asection *lcomm;
4284
4285 switch (sym->st_shndx)
4286 {
4287 case SHN_X86_64_LCOMMON:
4288 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4289 if (lcomm == NULL)
4290 {
4291 lcomm = bfd_make_section_with_flags (abfd,
4292 "LARGE_COMMON",
4293 (SEC_ALLOC
4294 | SEC_IS_COMMON
4295 | SEC_LINKER_CREATED));
4296 if (lcomm == NULL)
4297 return FALSE;
4298 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4299 }
4300 *secp = lcomm;
4301 *valp = sym->st_size;
4302 return TRUE;
4303 }
4304
4305 if ((abfd->flags & DYNAMIC) == 0
4306 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4307 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4308
4309 return TRUE;
4310 }
4311
4312
4313 /* Given a BFD section, try to locate the corresponding ELF section
4314 index. */
4315
4316 static bfd_boolean
4317 elf64_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4318 asection *sec, int *index_return)
4319 {
4320 if (sec == &_bfd_elf_large_com_section)
4321 {
4322 *index_return = SHN_X86_64_LCOMMON;
4323 return TRUE;
4324 }
4325 return FALSE;
4326 }
4327
4328 /* Process a symbol. */
4329
4330 static void
4331 elf64_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4332 asymbol *asym)
4333 {
4334 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4335
4336 switch (elfsym->internal_elf_sym.st_shndx)
4337 {
4338 case SHN_X86_64_LCOMMON:
4339 asym->section = &_bfd_elf_large_com_section;
4340 asym->value = elfsym->internal_elf_sym.st_size;
4341 /* Common symbol doesn't set BSF_GLOBAL. */
4342 asym->flags &= ~BSF_GLOBAL;
4343 break;
4344 }
4345 }
4346
4347 static bfd_boolean
4348 elf64_x86_64_common_definition (Elf_Internal_Sym *sym)
4349 {
4350 return (sym->st_shndx == SHN_COMMON
4351 || sym->st_shndx == SHN_X86_64_LCOMMON);
4352 }
4353
4354 static unsigned int
4355 elf64_x86_64_common_section_index (asection *sec)
4356 {
4357 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4358 return SHN_COMMON;
4359 else
4360 return SHN_X86_64_LCOMMON;
4361 }
4362
4363 static asection *
4364 elf64_x86_64_common_section (asection *sec)
4365 {
4366 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4367 return bfd_com_section_ptr;
4368 else
4369 return &_bfd_elf_large_com_section;
4370 }
4371
4372 static bfd_boolean
4373 elf64_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
4374 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
4375 struct elf_link_hash_entry *h,
4376 Elf_Internal_Sym *sym,
4377 asection **psec,
4378 bfd_vma *pvalue ATTRIBUTE_UNUSED,
4379 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
4380 bfd_boolean *skip ATTRIBUTE_UNUSED,
4381 bfd_boolean *override ATTRIBUTE_UNUSED,
4382 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
4383 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
4384 bfd_boolean *newdef ATTRIBUTE_UNUSED,
4385 bfd_boolean *newdyn,
4386 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
4387 bfd_boolean *newweak ATTRIBUTE_UNUSED,
4388 bfd *abfd ATTRIBUTE_UNUSED,
4389 asection **sec,
4390 bfd_boolean *olddef ATTRIBUTE_UNUSED,
4391 bfd_boolean *olddyn,
4392 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
4393 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
4394 bfd *oldbfd,
4395 asection **oldsec)
4396 {
4397 /* A normal common symbol and a large common symbol result in a
4398 normal common symbol. We turn the large common symbol into a
4399 normal one. */
4400 if (!*olddyn
4401 && h->root.type == bfd_link_hash_common
4402 && !*newdyn
4403 && bfd_is_com_section (*sec)
4404 && *oldsec != *sec)
4405 {
4406 if (sym->st_shndx == SHN_COMMON
4407 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
4408 {
4409 h->root.u.c.p->section
4410 = bfd_make_section_old_way (oldbfd, "COMMON");
4411 h->root.u.c.p->section->flags = SEC_ALLOC;
4412 }
4413 else if (sym->st_shndx == SHN_X86_64_LCOMMON
4414 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
4415 *psec = *sec = bfd_com_section_ptr;
4416 }
4417
4418 return TRUE;
4419 }
4420
4421 static int
4422 elf64_x86_64_additional_program_headers (bfd *abfd,
4423 struct bfd_link_info *info ATTRIBUTE_UNUSED)
4424 {
4425 asection *s;
4426 int count = 0;
4427
4428 /* Check to see if we need a large readonly segment. */
4429 s = bfd_get_section_by_name (abfd, ".lrodata");
4430 if (s && (s->flags & SEC_LOAD))
4431 count++;
4432
4433 /* Check to see if we need a large data segment. Since .lbss sections
4434 is placed right after the .bss section, there should be no need for
4435 a large data segment just because of .lbss. */
4436 s = bfd_get_section_by_name (abfd, ".ldata");
4437 if (s && (s->flags & SEC_LOAD))
4438 count++;
4439
4440 return count;
4441 }
4442
4443 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4444
4445 static bfd_boolean
4446 elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h)
4447 {
4448 if (h->plt.offset != (bfd_vma) -1
4449 && !h->def_regular
4450 && !h->pointer_equality_needed)
4451 return FALSE;
4452
4453 return _bfd_elf_hash_symbol (h);
4454 }
4455
4456 static const struct bfd_elf_special_section
4457 elf64_x86_64_special_sections[]=
4458 {
4459 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4460 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4461 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
4462 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4463 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4464 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4465 { NULL, 0, 0, 0, 0 }
4466 };
4467
4468 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4469 #define TARGET_LITTLE_NAME "elf64-x86-64"
4470 #define ELF_ARCH bfd_arch_i386
4471 #define ELF_TARGET_ID X86_64_ELF_DATA
4472 #define ELF_MACHINE_CODE EM_X86_64
4473 #define ELF_MAXPAGESIZE 0x200000
4474 #define ELF_MINPAGESIZE 0x1000
4475 #define ELF_COMMONPAGESIZE 0x1000
4476
4477 #define elf_backend_can_gc_sections 1
4478 #define elf_backend_can_refcount 1
4479 #define elf_backend_want_got_plt 1
4480 #define elf_backend_plt_readonly 1
4481 #define elf_backend_want_plt_sym 0
4482 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4483 #define elf_backend_rela_normal 1
4484
4485 #define elf_info_to_howto elf64_x86_64_info_to_howto
4486
4487 #define bfd_elf64_bfd_link_hash_table_create \
4488 elf64_x86_64_link_hash_table_create
4489 #define bfd_elf64_bfd_link_hash_table_free \
4490 elf64_x86_64_link_hash_table_free
4491 #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
4492 #define bfd_elf64_bfd_reloc_name_lookup \
4493 elf64_x86_64_reloc_name_lookup
4494
4495 #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
4496 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4497 #define elf_backend_check_relocs elf64_x86_64_check_relocs
4498 #define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
4499 #define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
4500 #define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
4501 #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
4502 #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
4503 #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
4504 #define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
4505 #define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
4506 #define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
4507 #define elf_backend_relocate_section elf64_x86_64_relocate_section
4508 #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
4509 #define elf_backend_always_size_sections elf64_x86_64_always_size_sections
4510 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4511 #define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
4512 #define elf_backend_object_p elf64_x86_64_elf_object_p
4513 #define bfd_elf64_mkobject elf64_x86_64_mkobject
4514
4515 #define elf_backend_section_from_shdr \
4516 elf64_x86_64_section_from_shdr
4517
4518 #define elf_backend_section_from_bfd_section \
4519 elf64_x86_64_elf_section_from_bfd_section
4520 #define elf_backend_add_symbol_hook \
4521 elf64_x86_64_add_symbol_hook
4522 #define elf_backend_symbol_processing \
4523 elf64_x86_64_symbol_processing
4524 #define elf_backend_common_section_index \
4525 elf64_x86_64_common_section_index
4526 #define elf_backend_common_section \
4527 elf64_x86_64_common_section
4528 #define elf_backend_common_definition \
4529 elf64_x86_64_common_definition
4530 #define elf_backend_merge_symbol \
4531 elf64_x86_64_merge_symbol
4532 #define elf_backend_special_sections \
4533 elf64_x86_64_special_sections
4534 #define elf_backend_additional_program_headers \
4535 elf64_x86_64_additional_program_headers
4536 #define elf_backend_hash_symbol \
4537 elf64_x86_64_hash_symbol
4538
4539 #undef elf_backend_post_process_headers
4540 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4541
4542 #include "elf64-target.h"
4543
4544 /* FreeBSD support. */
4545
4546 #undef TARGET_LITTLE_SYM
4547 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4548 #undef TARGET_LITTLE_NAME
4549 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4550
4551 #undef ELF_OSABI
4552 #define ELF_OSABI ELFOSABI_FREEBSD
4553
4554 #undef elf64_bed
4555 #define elf64_bed elf64_x86_64_fbsd_bed
4556
4557 #include "elf64-target.h"
4558
4559 /* Solaris 2 support. */
4560
4561 #undef TARGET_LITTLE_SYM
4562 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
4563 #undef TARGET_LITTLE_NAME
4564 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
4565
4566 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4567 objects won't be recognized. */
4568 #undef ELF_OSABI
4569
4570 #undef elf64_bed
4571 #define elf64_bed elf64_x86_64_sol2_bed
4572
4573 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
4574 boundary. */
4575 #undef elf_backend_static_tls_alignment
4576 #define elf_backend_static_tls_alignment 16
4577
4578 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4579
4580 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4581 File, p.63. */
4582 #undef elf_backend_want_plt_sym
4583 #define elf_backend_want_plt_sym 1
4584
4585 #include "elf64-target.h"
4586
4587 /* Intel L1OM support. */
4588
4589 static bfd_boolean
4590 elf64_l1om_elf_object_p (bfd *abfd)
4591 {
4592 /* Set the right machine number for an L1OM elf64 file. */
4593 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
4594 return TRUE;
4595 }
4596
4597 #undef TARGET_LITTLE_SYM
4598 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
4599 #undef TARGET_LITTLE_NAME
4600 #define TARGET_LITTLE_NAME "elf64-l1om"
4601 #undef ELF_ARCH
4602 #define ELF_ARCH bfd_arch_l1om
4603
4604 #undef ELF_MACHINE_CODE
4605 #define ELF_MACHINE_CODE EM_L1OM
4606
4607 #undef ELF_OSABI
4608
4609 #undef elf64_bed
4610 #define elf64_bed elf64_l1om_bed
4611
4612 #undef elf_backend_object_p
4613 #define elf_backend_object_p elf64_l1om_elf_object_p
4614
4615 #undef elf_backend_post_process_headers
4616 #undef elf_backend_static_tls_alignment
4617
4618 #include "elf64-target.h"
4619
4620 /* FreeBSD L1OM support. */
4621
4622 #undef TARGET_LITTLE_SYM
4623 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
4624 #undef TARGET_LITTLE_NAME
4625 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
4626
4627 #undef ELF_OSABI
4628 #define ELF_OSABI ELFOSABI_FREEBSD
4629
4630 #undef elf64_bed
4631 #define elf64_bed elf64_l1om_fbsd_bed
4632
4633 #undef elf_backend_post_process_headers
4634 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4635
4636 #include "elf64-target.h"
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