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Revert the last change to elf64-x86-64.c.
[binutils.git] / bfd / elf64-x86-64.c
blob343abce6454b86371da106068334d0ad973656d6
1 /* X86-64 specific support for ELF
2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2010 Free Software Foundation, Inc.
4 Contributed by Jan Hubicka <jh@suse.cz>.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31
32 #include "elf/x86-64.h"
33
34 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
35 #define MINUS_ONE (~ (bfd_vma) 0)
36
37 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
38 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
39 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
40 since they are the same. */
41
42 #define ABI_64_P(abfd) \
43 (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
44
45 /* The relocation "howto" table. Order of fields:
46 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
47 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
48 static reloc_howto_type x86_64_elf_howto_table[] =
49 {
50 HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
51 bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
52 FALSE),
53 HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
55 FALSE),
56 HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
57 bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
58 TRUE),
59 HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
60 bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
61 FALSE),
62 HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
63 bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
64 TRUE),
65 HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
67 FALSE),
68 HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
70 MINUS_ONE, FALSE),
71 HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
73 MINUS_ONE, FALSE),
74 HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
75 bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
76 MINUS_ONE, FALSE),
77 HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
78 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
79 0xffffffff, TRUE),
80 HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
81 bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
82 FALSE),
83 HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
84 bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
85 FALSE),
86 HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
88 HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
90 HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
92 HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
93 bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
94 HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
96 MINUS_ONE, FALSE),
97 HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
99 MINUS_ONE, FALSE),
100 HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
102 MINUS_ONE, FALSE),
103 HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
105 0xffffffff, TRUE),
106 HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
107 bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
108 0xffffffff, TRUE),
109 HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
110 bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
111 0xffffffff, FALSE),
112 HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
113 bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
114 0xffffffff, TRUE),
115 HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
116 bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
117 0xffffffff, FALSE),
118 HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
120 TRUE),
121 HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
123 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
124 HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
125 bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
126 FALSE, 0xffffffff, 0xffffffff, TRUE),
127 HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
128 bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
129 FALSE),
130 HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
131 bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
132 MINUS_ONE, TRUE),
133 HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
134 bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
135 FALSE, MINUS_ONE, MINUS_ONE, TRUE),
136 HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
137 bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
138 MINUS_ONE, FALSE),
139 HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
140 bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
141 MINUS_ONE, FALSE),
142 EMPTY_HOWTO (32),
143 EMPTY_HOWTO (33),
144 HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
145 complain_overflow_bitfield, bfd_elf_generic_reloc,
146 "R_X86_64_GOTPC32_TLSDESC",
147 FALSE, 0xffffffff, 0xffffffff, TRUE),
148 HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
149 complain_overflow_dont, bfd_elf_generic_reloc,
150 "R_X86_64_TLSDESC_CALL",
151 FALSE, 0, 0, FALSE),
152 HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
153 complain_overflow_bitfield, bfd_elf_generic_reloc,
154 "R_X86_64_TLSDESC",
155 FALSE, MINUS_ONE, MINUS_ONE, FALSE),
156 HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
157 bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
158 MINUS_ONE, FALSE),
159
160 /* We have a gap in the reloc numbers here.
161 R_X86_64_standard counts the number up to this point, and
162 R_X86_64_vt_offset is the value to subtract from a reloc type of
163 R_X86_64_GNU_VT* to form an index into this table. */
164 #define R_X86_64_standard (R_X86_64_IRELATIVE + 1)
165 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
166
167 /* GNU extension to record C++ vtable hierarchy. */
168 HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
169 NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
170
171 /* GNU extension to record C++ vtable member usage. */
172 HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
173 _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
174 FALSE)
175 };
176
177 #define IS_X86_64_PCREL_TYPE(TYPE) \
178 ( ((TYPE) == R_X86_64_PC8) \
179 || ((TYPE) == R_X86_64_PC16) \
180 || ((TYPE) == R_X86_64_PC32) \
181 || ((TYPE) == R_X86_64_PC64))
182
183 /* Map BFD relocs to the x86_64 elf relocs. */
184 struct elf_reloc_map
185 {
186 bfd_reloc_code_real_type bfd_reloc_val;
187 unsigned char elf_reloc_val;
188 };
189
190 static const struct elf_reloc_map x86_64_reloc_map[] =
191 {
192 { BFD_RELOC_NONE, R_X86_64_NONE, },
193 { BFD_RELOC_64, R_X86_64_64, },
194 { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
195 { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
196 { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
197 { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
198 { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
199 { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
200 { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
201 { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
202 { BFD_RELOC_32, R_X86_64_32, },
203 { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
204 { BFD_RELOC_16, R_X86_64_16, },
205 { BFD_RELOC_16_PCREL, R_X86_64_PC16, },
206 { BFD_RELOC_8, R_X86_64_8, },
207 { BFD_RELOC_8_PCREL, R_X86_64_PC8, },
208 { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
209 { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
210 { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
211 { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
212 { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
213 { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
214 { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
215 { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
216 { BFD_RELOC_64_PCREL, R_X86_64_PC64, },
217 { BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
218 { BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
219 { BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
220 { BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
221 { BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
222 { BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
223 { BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
224 { BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
225 { BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
226 { BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
227 { BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
228 { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
229 { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
230 };
231
232 static reloc_howto_type *
233 elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
234 {
235 unsigned i;
236
237 if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
238 || r_type >= (unsigned int) R_X86_64_max)
239 {
240 if (r_type >= (unsigned int) R_X86_64_standard)
241 {
242 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
243 abfd, (int) r_type);
244 r_type = R_X86_64_NONE;
245 }
246 i = r_type;
247 }
248 else
249 i = r_type - (unsigned int) R_X86_64_vt_offset;
250 BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
251 return &x86_64_elf_howto_table[i];
252 }
253
254 /* Given a BFD reloc type, return a HOWTO structure. */
255 static reloc_howto_type *
256 elf_x86_64_reloc_type_lookup (bfd *abfd,
257 bfd_reloc_code_real_type code)
258 {
259 unsigned int i;
260
261 for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
262 i++)
263 {
264 if (x86_64_reloc_map[i].bfd_reloc_val == code)
265 return elf_x86_64_rtype_to_howto (abfd,
266 x86_64_reloc_map[i].elf_reloc_val);
267 }
268 return 0;
269 }
270
271 static reloc_howto_type *
272 elf_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
273 const char *r_name)
274 {
275 unsigned int i;
276
277 for (i = 0;
278 i < (sizeof (x86_64_elf_howto_table)
279 / sizeof (x86_64_elf_howto_table[0]));
280 i++)
281 if (x86_64_elf_howto_table[i].name != NULL
282 && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
283 return &x86_64_elf_howto_table[i];
284
285 return NULL;
286 }
287
288 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
289
290 static void
291 elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
292 Elf_Internal_Rela *dst)
293 {
294 unsigned r_type;
295
296 r_type = ELF32_R_TYPE (dst->r_info);
297 cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
298 BFD_ASSERT (r_type == cache_ptr->howto->type);
299 }
300 \f
301 /* Support for core dump NOTE sections. */
302 static bfd_boolean
303 elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
304 {
305 int offset;
306 size_t size;
307
308 switch (note->descsz)
309 {
310 default:
311 return FALSE;
312
313 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
314 /* pr_cursig */
315 elf_tdata (abfd)->core_signal
316 = bfd_get_16 (abfd, note->descdata + 12);
317
318 /* pr_pid */
319 elf_tdata (abfd)->core_lwpid
320 = bfd_get_32 (abfd, note->descdata + 32);
321
322 /* pr_reg */
323 offset = 112;
324 size = 216;
325
326 break;
327 }
328
329 /* Make a ".reg/999" section. */
330 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
331 size, note->descpos + offset);
332 }
333
334 static bfd_boolean
335 elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
336 {
337 switch (note->descsz)
338 {
339 default:
340 return FALSE;
341
342 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
343 elf_tdata (abfd)->core_pid
344 = bfd_get_32 (abfd, note->descdata + 24);
345 elf_tdata (abfd)->core_program
346 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
347 elf_tdata (abfd)->core_command
348 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
349 }
350
351 /* Note that for some reason, a spurious space is tacked
352 onto the end of the args in some (at least one anyway)
353 implementations, so strip it off if it exists. */
354
355 {
356 char *command = elf_tdata (abfd)->core_command;
357 int n = strlen (command);
358
359 if (0 < n && command[n - 1] == ' ')
360 command[n - 1] = '\0';
361 }
362
363 return TRUE;
364 }
365 \f
366 /* Functions for the x86-64 ELF linker. */
367
368 /* The name of the dynamic interpreter. This is put in the .interp
369 section. */
370
371 #define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
372 #define ELF32_DYNAMIC_INTERPRETER "/lib/ld32.so.1"
373
374 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
375 copying dynamic variables from a shared lib into an app's dynbss
376 section, and instead use a dynamic relocation to point into the
377 shared lib. */
378 #define ELIMINATE_COPY_RELOCS 1
379
380 /* The size in bytes of an entry in the global offset table. */
381
382 #define GOT_ENTRY_SIZE 8
383
384 /* The size in bytes of an entry in the procedure linkage table. */
385
386 #define PLT_ENTRY_SIZE 16
387
388 /* The first entry in a procedure linkage table looks like this. See the
389 SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
390
391 static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
392 {
393 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
394 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
395 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
396 };
397
398 /* Subsequent entries in a procedure linkage table look like this. */
399
400 static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
401 {
402 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
403 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
404 0x68, /* pushq immediate */
405 0, 0, 0, 0, /* replaced with index into relocation table. */
406 0xe9, /* jmp relative */
407 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
408 };
409
410 /* x86-64 ELF linker hash entry. */
411
412 struct elf_x86_64_link_hash_entry
413 {
414 struct elf_link_hash_entry elf;
415
416 /* Track dynamic relocs copied for this symbol. */
417 struct elf_dyn_relocs *dyn_relocs;
418
419 #define GOT_UNKNOWN 0
420 #define GOT_NORMAL 1
421 #define GOT_TLS_GD 2
422 #define GOT_TLS_IE 3
423 #define GOT_TLS_GDESC 4
424 #define GOT_TLS_GD_BOTH_P(type) \
425 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
426 #define GOT_TLS_GD_P(type) \
427 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
428 #define GOT_TLS_GDESC_P(type) \
429 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
430 #define GOT_TLS_GD_ANY_P(type) \
431 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
432 unsigned char tls_type;
433
434 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
435 starting at the end of the jump table. */
436 bfd_vma tlsdesc_got;
437 };
438
439 #define elf_x86_64_hash_entry(ent) \
440 ((struct elf_x86_64_link_hash_entry *)(ent))
441
442 struct elf_x86_64_obj_tdata
443 {
444 struct elf_obj_tdata root;
445
446 /* tls_type for each local got entry. */
447 char *local_got_tls_type;
448
449 /* GOTPLT entries for TLS descriptors. */
450 bfd_vma *local_tlsdesc_gotent;
451 };
452
453 #define elf_x86_64_tdata(abfd) \
454 ((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
455
456 #define elf_x86_64_local_got_tls_type(abfd) \
457 (elf_x86_64_tdata (abfd)->local_got_tls_type)
458
459 #define elf_x86_64_local_tlsdesc_gotent(abfd) \
460 (elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
461
462 #define is_x86_64_elf(bfd) \
463 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
464 && elf_tdata (bfd) != NULL \
465 && elf_object_id (bfd) == X86_64_ELF_DATA)
466
467 static bfd_boolean
468 elf_x86_64_mkobject (bfd *abfd)
469 {
470 return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
471 X86_64_ELF_DATA);
472 }
473
474 /* x86-64 ELF linker hash table. */
475
476 struct elf_x86_64_link_hash_table
477 {
478 struct elf_link_hash_table elf;
479
480 /* Short-cuts to get to dynamic linker sections. */
481 asection *sdynbss;
482 asection *srelbss;
483
484 union
485 {
486 bfd_signed_vma refcount;
487 bfd_vma offset;
488 } tls_ld_got;
489
490 /* The amount of space used by the jump slots in the GOT. */
491 bfd_vma sgotplt_jump_table_size;
492
493 /* Small local sym cache. */
494 struct sym_cache sym_cache;
495
496 bfd_vma (*r_info) (bfd_vma, bfd_vma);
497 bfd_vma (*r_sym) (bfd_vma);
498 unsigned int pointer_r_type;
499 const char *dynamic_interpreter;
500 int dynamic_interpreter_size;
501
502 /* _TLS_MODULE_BASE_ symbol. */
503 struct bfd_link_hash_entry *tls_module_base;
504
505 /* Used by local STT_GNU_IFUNC symbols. */
506 htab_t loc_hash_table;
507 void * loc_hash_memory;
508
509 /* The offset into splt of the PLT entry for the TLS descriptor
510 resolver. Special values are 0, if not necessary (or not found
511 to be necessary yet), and -1 if needed but not determined
512 yet. */
513 bfd_vma tlsdesc_plt;
514 /* The offset into sgot of the GOT entry used by the PLT entry
515 above. */
516 bfd_vma tlsdesc_got;
517 };
518
519 /* Get the x86-64 ELF linker hash table from a link_info structure. */
520
521 #define elf_x86_64_hash_table(p) \
522 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
523 == X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
524
525 #define elf_x86_64_compute_jump_table_size(htab) \
526 ((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
527
528 /* Create an entry in an x86-64 ELF linker hash table. */
529
530 static struct bfd_hash_entry *
531 elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
532 struct bfd_hash_table *table,
533 const char *string)
534 {
535 /* Allocate the structure if it has not already been allocated by a
536 subclass. */
537 if (entry == NULL)
538 {
539 entry = (struct bfd_hash_entry *)
540 bfd_hash_allocate (table,
541 sizeof (struct elf_x86_64_link_hash_entry));
542 if (entry == NULL)
543 return entry;
544 }
545
546 /* Call the allocation method of the superclass. */
547 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
548 if (entry != NULL)
549 {
550 struct elf_x86_64_link_hash_entry *eh;
551
552 eh = (struct elf_x86_64_link_hash_entry *) entry;
553 eh->dyn_relocs = NULL;
554 eh->tls_type = GOT_UNKNOWN;
555 eh->tlsdesc_got = (bfd_vma) -1;
556 }
557
558 return entry;
559 }
560
561 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
562 for local symbol so that we can handle local STT_GNU_IFUNC symbols
563 as global symbol. We reuse indx and dynstr_index for local symbol
564 hash since they aren't used by global symbols in this backend. */
565
566 static hashval_t
567 elf_x86_64_local_htab_hash (const void *ptr)
568 {
569 struct elf_link_hash_entry *h
570 = (struct elf_link_hash_entry *) ptr;
571 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
572 }
573
574 /* Compare local hash entries. */
575
576 static int
577 elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
578 {
579 struct elf_link_hash_entry *h1
580 = (struct elf_link_hash_entry *) ptr1;
581 struct elf_link_hash_entry *h2
582 = (struct elf_link_hash_entry *) ptr2;
583
584 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
585 }
586
587 /* Find and/or create a hash entry for local symbol. */
588
589 static struct elf_link_hash_entry *
590 elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
591 bfd *abfd, const Elf_Internal_Rela *rel,
592 bfd_boolean create)
593 {
594 struct elf_x86_64_link_hash_entry e, *ret;
595 asection *sec = abfd->sections;
596 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
597 htab->r_sym (rel->r_info));
598 void **slot;
599
600 e.elf.indx = sec->id;
601 e.elf.dynstr_index = htab->r_sym (rel->r_info);
602 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
603 create ? INSERT : NO_INSERT);
604
605 if (!slot)
606 return NULL;
607
608 if (*slot)
609 {
610 ret = (struct elf_x86_64_link_hash_entry *) *slot;
611 return &ret->elf;
612 }
613
614 ret = (struct elf_x86_64_link_hash_entry *)
615 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
616 sizeof (struct elf_x86_64_link_hash_entry));
617 if (ret)
618 {
619 memset (ret, 0, sizeof (*ret));
620 ret->elf.indx = sec->id;
621 ret->elf.dynstr_index = htab->r_sym (rel->r_info);
622 ret->elf.dynindx = -1;
623 *slot = ret;
624 }
625 return &ret->elf;
626 }
627
628 /* Create an X86-64 ELF linker hash table. */
629
630 static struct bfd_link_hash_table *
631 elf_x86_64_link_hash_table_create (bfd *abfd)
632 {
633 struct elf_x86_64_link_hash_table *ret;
634 bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
635
636 ret = (struct elf_x86_64_link_hash_table *) bfd_malloc (amt);
637 if (ret == NULL)
638 return NULL;
639
640 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
641 elf_x86_64_link_hash_newfunc,
642 sizeof (struct elf_x86_64_link_hash_entry),
643 X86_64_ELF_DATA))
644 {
645 free (ret);
646 return NULL;
647 }
648
649 ret->sdynbss = NULL;
650 ret->srelbss = NULL;
651 ret->sym_cache.abfd = NULL;
652 ret->tlsdesc_plt = 0;
653 ret->tlsdesc_got = 0;
654 ret->tls_ld_got.refcount = 0;
655 ret->sgotplt_jump_table_size = 0;
656 ret->tls_module_base = NULL;
657
658 if (ABI_64_P (abfd))
659 {
660 ret->r_info = elf64_r_info;
661 ret->r_sym = elf64_r_sym;
662 ret->pointer_r_type = R_X86_64_64;
663 ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
664 ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
665 }
666 else
667 {
668 ret->r_info = elf32_r_info;
669 ret->r_sym = elf32_r_sym;
670 ret->pointer_r_type = R_X86_64_32;
671 ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
672 ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
673 }
674
675 ret->loc_hash_table = htab_try_create (1024,
676 elf_x86_64_local_htab_hash,
677 elf_x86_64_local_htab_eq,
678 NULL);
679 ret->loc_hash_memory = objalloc_create ();
680 if (!ret->loc_hash_table || !ret->loc_hash_memory)
681 {
682 free (ret);
683 return NULL;
684 }
685
686 return &ret->elf.root;
687 }
688
689 /* Destroy an X86-64 ELF linker hash table. */
690
691 static void
692 elf_x86_64_link_hash_table_free (struct bfd_link_hash_table *hash)
693 {
694 struct elf_x86_64_link_hash_table *htab
695 = (struct elf_x86_64_link_hash_table *) hash;
696
697 if (htab->loc_hash_table)
698 htab_delete (htab->loc_hash_table);
699 if (htab->loc_hash_memory)
700 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
701 _bfd_generic_link_hash_table_free (hash);
702 }
703
704 /* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
705 .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
706 hash table. */
707
708 static bfd_boolean
709 elf_x86_64_create_dynamic_sections (bfd *dynobj,
710 struct bfd_link_info *info)
711 {
712 struct elf_x86_64_link_hash_table *htab;
713
714 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
715 return FALSE;
716
717 htab = elf_x86_64_hash_table (info);
718 if (htab == NULL)
719 return FALSE;
720
721 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
722 if (!info->shared)
723 htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
724
725 if (!htab->sdynbss
726 || (!info->shared && !htab->srelbss))
727 abort ();
728
729 return TRUE;
730 }
731
732 /* Copy the extra info we tack onto an elf_link_hash_entry. */
733
734 static void
735 elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
736 struct elf_link_hash_entry *dir,
737 struct elf_link_hash_entry *ind)
738 {
739 struct elf_x86_64_link_hash_entry *edir, *eind;
740
741 edir = (struct elf_x86_64_link_hash_entry *) dir;
742 eind = (struct elf_x86_64_link_hash_entry *) ind;
743
744 if (eind->dyn_relocs != NULL)
745 {
746 if (edir->dyn_relocs != NULL)
747 {
748 struct elf_dyn_relocs **pp;
749 struct elf_dyn_relocs *p;
750
751 /* Add reloc counts against the indirect sym to the direct sym
752 list. Merge any entries against the same section. */
753 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
754 {
755 struct elf_dyn_relocs *q;
756
757 for (q = edir->dyn_relocs; q != NULL; q = q->next)
758 if (q->sec == p->sec)
759 {
760 q->pc_count += p->pc_count;
761 q->count += p->count;
762 *pp = p->next;
763 break;
764 }
765 if (q == NULL)
766 pp = &p->next;
767 }
768 *pp = edir->dyn_relocs;
769 }
770
771 edir->dyn_relocs = eind->dyn_relocs;
772 eind->dyn_relocs = NULL;
773 }
774
775 if (ind->root.type == bfd_link_hash_indirect
776 && dir->got.refcount <= 0)
777 {
778 edir->tls_type = eind->tls_type;
779 eind->tls_type = GOT_UNKNOWN;
780 }
781
782 if (ELIMINATE_COPY_RELOCS
783 && ind->root.type != bfd_link_hash_indirect
784 && dir->dynamic_adjusted)
785 {
786 /* If called to transfer flags for a weakdef during processing
787 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
788 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
789 dir->ref_dynamic |= ind->ref_dynamic;
790 dir->ref_regular |= ind->ref_regular;
791 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
792 dir->needs_plt |= ind->needs_plt;
793 dir->pointer_equality_needed |= ind->pointer_equality_needed;
794 }
795 else
796 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
797 }
798
799 static bfd_boolean
800 elf64_x86_64_elf_object_p (bfd *abfd)
801 {
802 /* Set the right machine number for an x86-64 elf64 file. */
803 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
804 return TRUE;
805 }
806
807 typedef union
808 {
809 unsigned char c[2];
810 uint16_t i;
811 }
812 x86_64_opcode16;
813
814 typedef union
815 {
816 unsigned char c[4];
817 uint32_t i;
818 }
819 x86_64_opcode32;
820
821 /* Return TRUE if the TLS access code sequence support transition
822 from R_TYPE. */
823
824 static bfd_boolean
825 elf_x86_64_check_tls_transition (bfd *abfd,
826 struct bfd_link_info *info,
827 asection *sec,
828 bfd_byte *contents,
829 Elf_Internal_Shdr *symtab_hdr,
830 struct elf_link_hash_entry **sym_hashes,
831 unsigned int r_type,
832 const Elf_Internal_Rela *rel,
833 const Elf_Internal_Rela *relend)
834 {
835 unsigned int val;
836 unsigned long r_symndx;
837 struct elf_link_hash_entry *h;
838 bfd_vma offset;
839 struct elf_x86_64_link_hash_table *htab;
840
841 /* Get the section contents. */
842 if (contents == NULL)
843 {
844 if (elf_section_data (sec)->this_hdr.contents != NULL)
845 contents = elf_section_data (sec)->this_hdr.contents;
846 else
847 {
848 /* FIXME: How to better handle error condition? */
849 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
850 return FALSE;
851
852 /* Cache the section contents for elf_link_input_bfd. */
853 elf_section_data (sec)->this_hdr.contents = contents;
854 }
855 }
856
857 htab = elf_x86_64_hash_table (info);
858 offset = rel->r_offset;
859 switch (r_type)
860 {
861 case R_X86_64_TLSGD:
862 case R_X86_64_TLSLD:
863 if ((rel + 1) >= relend)
864 return FALSE;
865
866 if (r_type == R_X86_64_TLSGD)
867 {
868 /* Check transition from GD access model. Only
869 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
870 .word 0x6666; rex64; call __tls_get_addr
871 can transit to different access model. */
872
873 static x86_64_opcode32 leaq = { { 0x66, 0x48, 0x8d, 0x3d } },
874 call = { { 0x66, 0x66, 0x48, 0xe8 } };
875 if (offset < 4
876 || (offset + 12) > sec->size
877 || bfd_get_32 (abfd, contents + offset - 4) != leaq.i
878 || bfd_get_32 (abfd, contents + offset + 4) != call.i)
879 return FALSE;
880 }
881 else
882 {
883 /* Check transition from LD access model. Only
884 leaq foo@tlsld(%rip), %rdi;
885 call __tls_get_addr
886 can transit to different access model. */
887
888 static x86_64_opcode32 ld = { { 0x48, 0x8d, 0x3d, 0xe8 } };
889 x86_64_opcode32 op;
890
891 if (offset < 3 || (offset + 9) > sec->size)
892 return FALSE;
893
894 op.i = bfd_get_32 (abfd, contents + offset - 3);
895 op.c[3] = bfd_get_8 (abfd, contents + offset + 4);
896 if (op.i != ld.i)
897 return FALSE;
898 }
899
900 r_symndx = htab->r_sym (rel[1].r_info);
901 if (r_symndx < symtab_hdr->sh_info)
902 return FALSE;
903
904 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
905 /* Use strncmp to check __tls_get_addr since __tls_get_addr
906 may be versioned. */
907 return (h != NULL
908 && h->root.root.string != NULL
909 && (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
910 || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
911 && (strncmp (h->root.root.string,
912 "__tls_get_addr", 14) == 0));
913
914 case R_X86_64_GOTTPOFF:
915 /* Check transition from IE access model:
916 movq foo@gottpoff(%rip), %reg
917 addq foo@gottpoff(%rip), %reg
918 */
919
920 if (offset < 3 || (offset + 4) > sec->size)
921 return FALSE;
922
923 val = bfd_get_8 (abfd, contents + offset - 3);
924 if (val != 0x48 && val != 0x4c)
925 return FALSE;
926
927 val = bfd_get_8 (abfd, contents + offset - 2);
928 if (val != 0x8b && val != 0x03)
929 return FALSE;
930
931 val = bfd_get_8 (abfd, contents + offset - 1);
932 return (val & 0xc7) == 5;
933
934 case R_X86_64_GOTPC32_TLSDESC:
935 /* Check transition from GDesc access model:
936 leaq x@tlsdesc(%rip), %rax
937
938 Make sure it's a leaq adding rip to a 32-bit offset
939 into any register, although it's probably almost always
940 going to be rax. */
941
942 if (offset < 3 || (offset + 4) > sec->size)
943 return FALSE;
944
945 val = bfd_get_8 (abfd, contents + offset - 3);
946 if ((val & 0xfb) != 0x48)
947 return FALSE;
948
949 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
950 return FALSE;
951
952 val = bfd_get_8 (abfd, contents + offset - 1);
953 return (val & 0xc7) == 0x05;
954
955 case R_X86_64_TLSDESC_CALL:
956 /* Check transition from GDesc access model:
957 call *x@tlsdesc(%rax)
958 */
959 if (offset + 2 <= sec->size)
960 {
961 /* Make sure that it's a call *x@tlsdesc(%rax). */
962 static x86_64_opcode16 call = { { 0xff, 0x10 } };
963 return bfd_get_16 (abfd, contents + offset) == call.i;
964 }
965
966 return FALSE;
967
968 default:
969 abort ();
970 }
971 }
972
973 /* Return TRUE if the TLS access transition is OK or no transition
974 will be performed. Update R_TYPE if there is a transition. */
975
976 static bfd_boolean
977 elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
978 asection *sec, bfd_byte *contents,
979 Elf_Internal_Shdr *symtab_hdr,
980 struct elf_link_hash_entry **sym_hashes,
981 unsigned int *r_type, int tls_type,
982 const Elf_Internal_Rela *rel,
983 const Elf_Internal_Rela *relend,
984 struct elf_link_hash_entry *h,
985 unsigned long r_symndx)
986 {
987 unsigned int from_type = *r_type;
988 unsigned int to_type = from_type;
989 bfd_boolean check = TRUE;
990
991 /* Skip TLS transition for functions. */
992 if (h != NULL
993 && (h->type == STT_FUNC
994 || h->type == STT_GNU_IFUNC))
995 return TRUE;
996
997 switch (from_type)
998 {
999 case R_X86_64_TLSGD:
1000 case R_X86_64_GOTPC32_TLSDESC:
1001 case R_X86_64_TLSDESC_CALL:
1002 case R_X86_64_GOTTPOFF:
1003 if (info->executable)
1004 {
1005 if (h == NULL)
1006 to_type = R_X86_64_TPOFF32;
1007 else
1008 to_type = R_X86_64_GOTTPOFF;
1009 }
1010
1011 /* When we are called from elf_x86_64_relocate_section,
1012 CONTENTS isn't NULL and there may be additional transitions
1013 based on TLS_TYPE. */
1014 if (contents != NULL)
1015 {
1016 unsigned int new_to_type = to_type;
1017
1018 if (info->executable
1019 && h != NULL
1020 && h->dynindx == -1
1021 && tls_type == GOT_TLS_IE)
1022 new_to_type = R_X86_64_TPOFF32;
1023
1024 if (to_type == R_X86_64_TLSGD
1025 || to_type == R_X86_64_GOTPC32_TLSDESC
1026 || to_type == R_X86_64_TLSDESC_CALL)
1027 {
1028 if (tls_type == GOT_TLS_IE)
1029 new_to_type = R_X86_64_GOTTPOFF;
1030 }
1031
1032 /* We checked the transition before when we were called from
1033 elf_x86_64_check_relocs. We only want to check the new
1034 transition which hasn't been checked before. */
1035 check = new_to_type != to_type && from_type == to_type;
1036 to_type = new_to_type;
1037 }
1038
1039 break;
1040
1041 case R_X86_64_TLSLD:
1042 if (info->executable)
1043 to_type = R_X86_64_TPOFF32;
1044 break;
1045
1046 default:
1047 return TRUE;
1048 }
1049
1050 /* Return TRUE if there is no transition. */
1051 if (from_type == to_type)
1052 return TRUE;
1053
1054 /* Check if the transition can be performed. */
1055 if (check
1056 && ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
1057 symtab_hdr, sym_hashes,
1058 from_type, rel, relend))
1059 {
1060 reloc_howto_type *from, *to;
1061 const char *name;
1062
1063 from = elf_x86_64_rtype_to_howto (abfd, from_type);
1064 to = elf_x86_64_rtype_to_howto (abfd, to_type);
1065
1066 if (h)
1067 name = h->root.root.string;
1068 else
1069 {
1070 struct elf_x86_64_link_hash_table *htab;
1071
1072 htab = elf_x86_64_hash_table (info);
1073 if (htab == NULL)
1074 name = "*unknown*";
1075 else
1076 {
1077 Elf_Internal_Sym *isym;
1078
1079 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1080 abfd, r_symndx);
1081 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1082 }
1083 }
1084
1085 (*_bfd_error_handler)
1086 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1087 "in section `%A' failed"),
1088 abfd, sec, from->name, to->name, name,
1089 (unsigned long) rel->r_offset);
1090 bfd_set_error (bfd_error_bad_value);
1091 return FALSE;
1092 }
1093
1094 *r_type = to_type;
1095 return TRUE;
1096 }
1097
1098 /* Look through the relocs for a section during the first phase, and
1099 calculate needed space in the global offset table, procedure
1100 linkage table, and dynamic reloc sections. */
1101
1102 static bfd_boolean
1103 elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
1104 asection *sec,
1105 const Elf_Internal_Rela *relocs)
1106 {
1107 struct elf_x86_64_link_hash_table *htab;
1108 Elf_Internal_Shdr *symtab_hdr;
1109 struct elf_link_hash_entry **sym_hashes;
1110 const Elf_Internal_Rela *rel;
1111 const Elf_Internal_Rela *rel_end;
1112 asection *sreloc;
1113
1114 if (info->relocatable)
1115 return TRUE;
1116
1117 BFD_ASSERT (is_x86_64_elf (abfd));
1118
1119 htab = elf_x86_64_hash_table (info);
1120 if (htab == NULL)
1121 return FALSE;
1122
1123 symtab_hdr = &elf_symtab_hdr (abfd);
1124 sym_hashes = elf_sym_hashes (abfd);
1125
1126 sreloc = NULL;
1127
1128 rel_end = relocs + sec->reloc_count;
1129 for (rel = relocs; rel < rel_end; rel++)
1130 {
1131 unsigned int r_type;
1132 unsigned long r_symndx;
1133 struct elf_link_hash_entry *h;
1134 Elf_Internal_Sym *isym;
1135 const char *name;
1136
1137 r_symndx = htab->r_sym (rel->r_info);
1138 r_type = ELF32_R_TYPE (rel->r_info);
1139
1140 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1141 {
1142 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1143 abfd, r_symndx);
1144 return FALSE;
1145 }
1146
1147 if (r_symndx < symtab_hdr->sh_info)
1148 {
1149 /* A local symbol. */
1150 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1151 abfd, r_symndx);
1152 if (isym == NULL)
1153 return FALSE;
1154
1155 /* Check relocation against local STT_GNU_IFUNC symbol. */
1156 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1157 {
1158 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
1159 TRUE);
1160 if (h == NULL)
1161 return FALSE;
1162
1163 /* Fake a STT_GNU_IFUNC symbol. */
1164 h->type = STT_GNU_IFUNC;
1165 h->def_regular = 1;
1166 h->ref_regular = 1;
1167 h->forced_local = 1;
1168 h->root.type = bfd_link_hash_defined;
1169 }
1170 else
1171 h = NULL;
1172 }
1173 else
1174 {
1175 isym = NULL;
1176 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1177 while (h->root.type == bfd_link_hash_indirect
1178 || h->root.type == bfd_link_hash_warning)
1179 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1180 }
1181
1182 /* Check invalid x32 relocations. */
1183 if (!ABI_64_P (abfd))
1184 switch (r_type)
1185 {
1186 default:
1187 break;
1188
1189 case R_X86_64_64:
1190 case R_X86_64_DTPOFF64:
1191 case R_X86_64_TPOFF64:
1192 case R_X86_64_PC64:
1193 case R_X86_64_GOTOFF64:
1194 case R_X86_64_GOT64:
1195 case R_X86_64_GOTPCREL64:
1196 case R_X86_64_GOTPC64:
1197 case R_X86_64_GOTPLT64:
1198 case R_X86_64_PLTOFF64:
1199 {
1200 if (h)
1201 name = h->root.root.string;
1202 else
1203 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1204 NULL);
1205 (*_bfd_error_handler)
1206 (_("%B: relocation %s against symbol `%s' isn't "
1207 "supported in x32 mode"), abfd,
1208 x86_64_elf_howto_table[r_type].name, name);
1209 bfd_set_error (bfd_error_bad_value);
1210 return FALSE;
1211 }
1212 break;
1213 }
1214
1215 if (h != NULL)
1216 {
1217 /* Create the ifunc sections for static executables. If we
1218 never see an indirect function symbol nor we are building
1219 a static executable, those sections will be empty and
1220 won't appear in output. */
1221 switch (r_type)
1222 {
1223 default:
1224 break;
1225
1226 case R_X86_64_32S:
1227 case R_X86_64_32:
1228 case R_X86_64_64:
1229 case R_X86_64_PC32:
1230 case R_X86_64_PC64:
1231 case R_X86_64_PLT32:
1232 case R_X86_64_GOTPCREL:
1233 case R_X86_64_GOTPCREL64:
1234 if (!_bfd_elf_create_ifunc_sections (abfd, info))
1235 return FALSE;
1236 break;
1237 }
1238
1239 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1240 it here if it is defined in a non-shared object. */
1241 if (h->type == STT_GNU_IFUNC
1242 && h->def_regular)
1243 {
1244 /* It is referenced by a non-shared object. */
1245 h->ref_regular = 1;
1246 h->needs_plt = 1;
1247
1248 /* STT_GNU_IFUNC symbol must go through PLT. */
1249 h->plt.refcount += 1;
1250
1251 /* STT_GNU_IFUNC needs dynamic sections. */
1252 if (htab->elf.dynobj == NULL)
1253 htab->elf.dynobj = abfd;
1254
1255 switch (r_type)
1256 {
1257 default:
1258 if (h->root.root.string)
1259 name = h->root.root.string;
1260 else
1261 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1262 NULL);
1263 (*_bfd_error_handler)
1264 (_("%B: relocation %s against STT_GNU_IFUNC "
1265 "symbol `%s' isn't handled by %s"), abfd,
1266 x86_64_elf_howto_table[r_type].name,
1267 name, __FUNCTION__);
1268 bfd_set_error (bfd_error_bad_value);
1269 return FALSE;
1270
1271 case R_X86_64_32:
1272 if (ABI_64_P (abfd))
1273 goto not_pointer;
1274 case R_X86_64_64:
1275 h->non_got_ref = 1;
1276 h->pointer_equality_needed = 1;
1277 if (info->shared)
1278 {
1279 /* We must copy these reloc types into the output
1280 file. Create a reloc section in dynobj and
1281 make room for this reloc. */
1282 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1283 (abfd, info, sec, sreloc,
1284 &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs);
1285 if (sreloc == NULL)
1286 return FALSE;
1287 }
1288 break;
1289
1290 case R_X86_64_32S:
1291 case R_X86_64_PC32:
1292 case R_X86_64_PC64:
1293 not_pointer:
1294 h->non_got_ref = 1;
1295 if (r_type != R_X86_64_PC32
1296 && r_type != R_X86_64_PC64)
1297 h->pointer_equality_needed = 1;
1298 break;
1299
1300 case R_X86_64_PLT32:
1301 break;
1302
1303 case R_X86_64_GOTPCREL:
1304 case R_X86_64_GOTPCREL64:
1305 h->got.refcount += 1;
1306 if (htab->elf.sgot == NULL
1307 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1308 info))
1309 return FALSE;
1310 break;
1311 }
1312
1313 continue;
1314 }
1315 }
1316
1317 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1318 symtab_hdr, sym_hashes,
1319 &r_type, GOT_UNKNOWN,
1320 rel, rel_end, h, r_symndx))
1321 return FALSE;
1322
1323 switch (r_type)
1324 {
1325 case R_X86_64_TLSLD:
1326 htab->tls_ld_got.refcount += 1;
1327 goto create_got;
1328
1329 case R_X86_64_TPOFF32:
1330 if (!info->executable && ABI_64_P (abfd))
1331 {
1332 if (h)
1333 name = h->root.root.string;
1334 else
1335 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1336 NULL);
1337 (*_bfd_error_handler)
1338 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1339 abfd,
1340 x86_64_elf_howto_table[r_type].name, name);
1341 bfd_set_error (bfd_error_bad_value);
1342 return FALSE;
1343 }
1344 break;
1345
1346 case R_X86_64_GOTTPOFF:
1347 if (!info->executable)
1348 info->flags |= DF_STATIC_TLS;
1349 /* Fall through */
1350
1351 case R_X86_64_GOT32:
1352 case R_X86_64_GOTPCREL:
1353 case R_X86_64_TLSGD:
1354 case R_X86_64_GOT64:
1355 case R_X86_64_GOTPCREL64:
1356 case R_X86_64_GOTPLT64:
1357 case R_X86_64_GOTPC32_TLSDESC:
1358 case R_X86_64_TLSDESC_CALL:
1359 /* This symbol requires a global offset table entry. */
1360 {
1361 int tls_type, old_tls_type;
1362
1363 switch (r_type)
1364 {
1365 default: tls_type = GOT_NORMAL; break;
1366 case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
1367 case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
1368 case R_X86_64_GOTPC32_TLSDESC:
1369 case R_X86_64_TLSDESC_CALL:
1370 tls_type = GOT_TLS_GDESC; break;
1371 }
1372
1373 if (h != NULL)
1374 {
1375 if (r_type == R_X86_64_GOTPLT64)
1376 {
1377 /* This relocation indicates that we also need
1378 a PLT entry, as this is a function. We don't need
1379 a PLT entry for local symbols. */
1380 h->needs_plt = 1;
1381 h->plt.refcount += 1;
1382 }
1383 h->got.refcount += 1;
1384 old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
1385 }
1386 else
1387 {
1388 bfd_signed_vma *local_got_refcounts;
1389
1390 /* This is a global offset table entry for a local symbol. */
1391 local_got_refcounts = elf_local_got_refcounts (abfd);
1392 if (local_got_refcounts == NULL)
1393 {
1394 bfd_size_type size;
1395
1396 size = symtab_hdr->sh_info;
1397 size *= sizeof (bfd_signed_vma)
1398 + sizeof (bfd_vma) + sizeof (char);
1399 local_got_refcounts = ((bfd_signed_vma *)
1400 bfd_zalloc (abfd, size));
1401 if (local_got_refcounts == NULL)
1402 return FALSE;
1403 elf_local_got_refcounts (abfd) = local_got_refcounts;
1404 elf_x86_64_local_tlsdesc_gotent (abfd)
1405 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1406 elf_x86_64_local_got_tls_type (abfd)
1407 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1408 }
1409 local_got_refcounts[r_symndx] += 1;
1410 old_tls_type
1411 = elf_x86_64_local_got_tls_type (abfd) [r_symndx];
1412 }
1413
1414 /* If a TLS symbol is accessed using IE at least once,
1415 there is no point to use dynamic model for it. */
1416 if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1417 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1418 || tls_type != GOT_TLS_IE))
1419 {
1420 if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
1421 tls_type = old_tls_type;
1422 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1423 && GOT_TLS_GD_ANY_P (tls_type))
1424 tls_type |= old_tls_type;
1425 else
1426 {
1427 if (h)
1428 name = h->root.root.string;
1429 else
1430 name = bfd_elf_sym_name (abfd, symtab_hdr,
1431 isym, NULL);
1432 (*_bfd_error_handler)
1433 (_("%B: '%s' accessed both as normal and thread local symbol"),
1434 abfd, name);
1435 return FALSE;
1436 }
1437 }
1438
1439 if (old_tls_type != tls_type)
1440 {
1441 if (h != NULL)
1442 elf_x86_64_hash_entry (h)->tls_type = tls_type;
1443 else
1444 elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
1445 }
1446 }
1447 /* Fall through */
1448
1449 case R_X86_64_GOTOFF64:
1450 case R_X86_64_GOTPC32:
1451 case R_X86_64_GOTPC64:
1452 create_got:
1453 if (htab->elf.sgot == NULL)
1454 {
1455 if (htab->elf.dynobj == NULL)
1456 htab->elf.dynobj = abfd;
1457 if (!_bfd_elf_create_got_section (htab->elf.dynobj,
1458 info))
1459 return FALSE;
1460 }
1461 break;
1462
1463 case R_X86_64_PLT32:
1464 /* This symbol requires a procedure linkage table entry. We
1465 actually build the entry in adjust_dynamic_symbol,
1466 because this might be a case of linking PIC code which is
1467 never referenced by a dynamic object, in which case we
1468 don't need to generate a procedure linkage table entry
1469 after all. */
1470
1471 /* If this is a local symbol, we resolve it directly without
1472 creating a procedure linkage table entry. */
1473 if (h == NULL)
1474 continue;
1475
1476 h->needs_plt = 1;
1477 h->plt.refcount += 1;
1478 break;
1479
1480 case R_X86_64_PLTOFF64:
1481 /* This tries to form the 'address' of a function relative
1482 to GOT. For global symbols we need a PLT entry. */
1483 if (h != NULL)
1484 {
1485 h->needs_plt = 1;
1486 h->plt.refcount += 1;
1487 }
1488 goto create_got;
1489
1490 case R_X86_64_32:
1491 if (!ABI_64_P (abfd))
1492 goto pointer;
1493 case R_X86_64_8:
1494 case R_X86_64_16:
1495 case R_X86_64_32S:
1496 /* Let's help debug shared library creation. These relocs
1497 cannot be used in shared libs. Don't error out for
1498 sections we don't care about, such as debug sections or
1499 non-constant sections. */
1500 if (info->shared
1501 && (sec->flags & SEC_ALLOC) != 0
1502 && (sec->flags & SEC_READONLY) != 0)
1503 {
1504 if (h)
1505 name = h->root.root.string;
1506 else
1507 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1508 (*_bfd_error_handler)
1509 (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
1510 abfd, x86_64_elf_howto_table[r_type].name, name);
1511 bfd_set_error (bfd_error_bad_value);
1512 return FALSE;
1513 }
1514 /* Fall through. */
1515
1516 case R_X86_64_PC8:
1517 case R_X86_64_PC16:
1518 case R_X86_64_PC32:
1519 case R_X86_64_PC64:
1520 case R_X86_64_64:
1521 pointer:
1522 if (h != NULL && info->executable)
1523 {
1524 /* If this reloc is in a read-only section, we might
1525 need a copy reloc. We can't check reliably at this
1526 stage whether the section is read-only, as input
1527 sections have not yet been mapped to output sections.
1528 Tentatively set the flag for now, and correct in
1529 adjust_dynamic_symbol. */
1530 h->non_got_ref = 1;
1531
1532 /* We may need a .plt entry if the function this reloc
1533 refers to is in a shared lib. */
1534 h->plt.refcount += 1;
1535 if (r_type != R_X86_64_PC32 && r_type != R_X86_64_PC64)
1536 h->pointer_equality_needed = 1;
1537 }
1538
1539 /* If we are creating a shared library, and this is a reloc
1540 against a global symbol, or a non PC relative reloc
1541 against a local symbol, then we need to copy the reloc
1542 into the shared library. However, if we are linking with
1543 -Bsymbolic, we do not need to copy a reloc against a
1544 global symbol which is defined in an object we are
1545 including in the link (i.e., DEF_REGULAR is set). At
1546 this point we have not seen all the input files, so it is
1547 possible that DEF_REGULAR is not set now but will be set
1548 later (it is never cleared). In case of a weak definition,
1549 DEF_REGULAR may be cleared later by a strong definition in
1550 a shared library. We account for that possibility below by
1551 storing information in the relocs_copied field of the hash
1552 table entry. A similar situation occurs when creating
1553 shared libraries and symbol visibility changes render the
1554 symbol local.
1555
1556 If on the other hand, we are creating an executable, we
1557 may need to keep relocations for symbols satisfied by a
1558 dynamic library if we manage to avoid copy relocs for the
1559 symbol. */
1560 if ((info->shared
1561 && (sec->flags & SEC_ALLOC) != 0
1562 && (! IS_X86_64_PCREL_TYPE (r_type)
1563 || (h != NULL
1564 && (! SYMBOLIC_BIND (info, h)
1565 || h->root.type == bfd_link_hash_defweak
1566 || !h->def_regular))))
1567 || (ELIMINATE_COPY_RELOCS
1568 && !info->shared
1569 && (sec->flags & SEC_ALLOC) != 0
1570 && h != NULL
1571 && (h->root.type == bfd_link_hash_defweak
1572 || !h->def_regular)))
1573 {
1574 struct elf_dyn_relocs *p;
1575 struct elf_dyn_relocs **head;
1576
1577 /* We must copy these reloc types into the output file.
1578 Create a reloc section in dynobj and make room for
1579 this reloc. */
1580 if (sreloc == NULL)
1581 {
1582 if (htab->elf.dynobj == NULL)
1583 htab->elf.dynobj = abfd;
1584
1585 sreloc = _bfd_elf_make_dynamic_reloc_section
1586 (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
1587 abfd, /*rela?*/ TRUE);
1588
1589 if (sreloc == NULL)
1590 return FALSE;
1591 }
1592
1593 /* If this is a global symbol, we count the number of
1594 relocations we need for this symbol. */
1595 if (h != NULL)
1596 {
1597 head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
1598 }
1599 else
1600 {
1601 /* Track dynamic relocs needed for local syms too.
1602 We really need local syms available to do this
1603 easily. Oh well. */
1604 asection *s;
1605 void **vpp;
1606
1607 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1608 abfd, r_symndx);
1609 if (isym == NULL)
1610 return FALSE;
1611
1612 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1613 if (s == NULL)
1614 s = sec;
1615
1616 /* Beware of type punned pointers vs strict aliasing
1617 rules. */
1618 vpp = &(elf_section_data (s)->local_dynrel);
1619 head = (struct elf_dyn_relocs **)vpp;
1620 }
1621
1622 p = *head;
1623 if (p == NULL || p->sec != sec)
1624 {
1625 bfd_size_type amt = sizeof *p;
1626
1627 p = ((struct elf_dyn_relocs *)
1628 bfd_alloc (htab->elf.dynobj, amt));
1629 if (p == NULL)
1630 return FALSE;
1631 p->next = *head;
1632 *head = p;
1633 p->sec = sec;
1634 p->count = 0;
1635 p->pc_count = 0;
1636 }
1637
1638 p->count += 1;
1639 if (IS_X86_64_PCREL_TYPE (r_type))
1640 p->pc_count += 1;
1641 }
1642 break;
1643
1644 /* This relocation describes the C++ object vtable hierarchy.
1645 Reconstruct it for later use during GC. */
1646 case R_X86_64_GNU_VTINHERIT:
1647 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1648 return FALSE;
1649 break;
1650
1651 /* This relocation describes which C++ vtable entries are actually
1652 used. Record for later use during GC. */
1653 case R_X86_64_GNU_VTENTRY:
1654 BFD_ASSERT (h != NULL);
1655 if (h != NULL
1656 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
1657 return FALSE;
1658 break;
1659
1660 default:
1661 break;
1662 }
1663 }
1664
1665 return TRUE;
1666 }
1667
1668 /* Return the section that should be marked against GC for a given
1669 relocation. */
1670
1671 static asection *
1672 elf_x86_64_gc_mark_hook (asection *sec,
1673 struct bfd_link_info *info,
1674 Elf_Internal_Rela *rel,
1675 struct elf_link_hash_entry *h,
1676 Elf_Internal_Sym *sym)
1677 {
1678 if (h != NULL)
1679 switch (ELF32_R_TYPE (rel->r_info))
1680 {
1681 case R_X86_64_GNU_VTINHERIT:
1682 case R_X86_64_GNU_VTENTRY:
1683 return NULL;
1684 }
1685
1686 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1687 }
1688
1689 /* Update the got entry reference counts for the section being removed. */
1690
1691 static bfd_boolean
1692 elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
1693 asection *sec,
1694 const Elf_Internal_Rela *relocs)
1695 {
1696 struct elf_x86_64_link_hash_table *htab;
1697 Elf_Internal_Shdr *symtab_hdr;
1698 struct elf_link_hash_entry **sym_hashes;
1699 bfd_signed_vma *local_got_refcounts;
1700 const Elf_Internal_Rela *rel, *relend;
1701
1702 if (info->relocatable)
1703 return TRUE;
1704
1705 htab = elf_x86_64_hash_table (info);
1706 if (htab == NULL)
1707 return FALSE;
1708
1709 elf_section_data (sec)->local_dynrel = NULL;
1710
1711 symtab_hdr = &elf_symtab_hdr (abfd);
1712 sym_hashes = elf_sym_hashes (abfd);
1713 local_got_refcounts = elf_local_got_refcounts (abfd);
1714
1715 htab = elf_x86_64_hash_table (info);
1716 relend = relocs + sec->reloc_count;
1717 for (rel = relocs; rel < relend; rel++)
1718 {
1719 unsigned long r_symndx;
1720 unsigned int r_type;
1721 struct elf_link_hash_entry *h = NULL;
1722
1723 r_symndx = htab->r_sym (rel->r_info);
1724 if (r_symndx >= symtab_hdr->sh_info)
1725 {
1726 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1727 while (h->root.type == bfd_link_hash_indirect
1728 || h->root.type == bfd_link_hash_warning)
1729 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1730 }
1731 else
1732 {
1733 /* A local symbol. */
1734 Elf_Internal_Sym *isym;
1735
1736 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1737 abfd, r_symndx);
1738
1739 /* Check relocation against local STT_GNU_IFUNC symbol. */
1740 if (isym != NULL
1741 && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1742 {
1743 h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
1744 if (h == NULL)
1745 abort ();
1746 }
1747 }
1748
1749 if (h)
1750 {
1751 struct elf_x86_64_link_hash_entry *eh;
1752 struct elf_dyn_relocs **pp;
1753 struct elf_dyn_relocs *p;
1754
1755 eh = (struct elf_x86_64_link_hash_entry *) h;
1756
1757 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1758 if (p->sec == sec)
1759 {
1760 /* Everything must go for SEC. */
1761 *pp = p->next;
1762 break;
1763 }
1764 }
1765
1766 r_type = ELF32_R_TYPE (rel->r_info);
1767 if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
1768 symtab_hdr, sym_hashes,
1769 &r_type, GOT_UNKNOWN,
1770 rel, relend, h, r_symndx))
1771 return FALSE;
1772
1773 switch (r_type)
1774 {
1775 case R_X86_64_TLSLD:
1776 if (htab->tls_ld_got.refcount > 0)
1777 htab->tls_ld_got.refcount -= 1;
1778 break;
1779
1780 case R_X86_64_TLSGD:
1781 case R_X86_64_GOTPC32_TLSDESC:
1782 case R_X86_64_TLSDESC_CALL:
1783 case R_X86_64_GOTTPOFF:
1784 case R_X86_64_GOT32:
1785 case R_X86_64_GOTPCREL:
1786 case R_X86_64_GOT64:
1787 case R_X86_64_GOTPCREL64:
1788 case R_X86_64_GOTPLT64:
1789 if (h != NULL)
1790 {
1791 if (r_type == R_X86_64_GOTPLT64 && h->plt.refcount > 0)
1792 h->plt.refcount -= 1;
1793 if (h->got.refcount > 0)
1794 h->got.refcount -= 1;
1795 if (h->type == STT_GNU_IFUNC)
1796 {
1797 if (h->plt.refcount > 0)
1798 h->plt.refcount -= 1;
1799 }
1800 }
1801 else if (local_got_refcounts != NULL)
1802 {
1803 if (local_got_refcounts[r_symndx] > 0)
1804 local_got_refcounts[r_symndx] -= 1;
1805 }
1806 break;
1807
1808 case R_X86_64_8:
1809 case R_X86_64_16:
1810 case R_X86_64_32:
1811 case R_X86_64_64:
1812 case R_X86_64_32S:
1813 case R_X86_64_PC8:
1814 case R_X86_64_PC16:
1815 case R_X86_64_PC32:
1816 case R_X86_64_PC64:
1817 if (info->shared
1818 && (h == NULL || h->type != STT_GNU_IFUNC))
1819 break;
1820 /* Fall thru */
1821
1822 case R_X86_64_PLT32:
1823 case R_X86_64_PLTOFF64:
1824 if (h != NULL)
1825 {
1826 if (h->plt.refcount > 0)
1827 h->plt.refcount -= 1;
1828 }
1829 break;
1830
1831 default:
1832 break;
1833 }
1834 }
1835
1836 return TRUE;
1837 }
1838
1839 /* Adjust a symbol defined by a dynamic object and referenced by a
1840 regular object. The current definition is in some section of the
1841 dynamic object, but we're not including those sections. We have to
1842 change the definition to something the rest of the link can
1843 understand. */
1844
1845 static bfd_boolean
1846 elf_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
1847 struct elf_link_hash_entry *h)
1848 {
1849 struct elf_x86_64_link_hash_table *htab;
1850 asection *s;
1851
1852 /* STT_GNU_IFUNC symbol must go through PLT. */
1853 if (h->type == STT_GNU_IFUNC)
1854 {
1855 if (h->plt.refcount <= 0)
1856 {
1857 h->plt.offset = (bfd_vma) -1;
1858 h->needs_plt = 0;
1859 }
1860 return TRUE;
1861 }
1862
1863 /* If this is a function, put it in the procedure linkage table. We
1864 will fill in the contents of the procedure linkage table later,
1865 when we know the address of the .got section. */
1866 if (h->type == STT_FUNC
1867 || h->needs_plt)
1868 {
1869 if (h->plt.refcount <= 0
1870 || SYMBOL_CALLS_LOCAL (info, h)
1871 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1872 && h->root.type == bfd_link_hash_undefweak))
1873 {
1874 /* This case can occur if we saw a PLT32 reloc in an input
1875 file, but the symbol was never referred to by a dynamic
1876 object, or if all references were garbage collected. In
1877 such a case, we don't actually need to build a procedure
1878 linkage table, and we can just do a PC32 reloc instead. */
1879 h->plt.offset = (bfd_vma) -1;
1880 h->needs_plt = 0;
1881 }
1882
1883 return TRUE;
1884 }
1885 else
1886 /* It's possible that we incorrectly decided a .plt reloc was
1887 needed for an R_X86_64_PC32 reloc to a non-function sym in
1888 check_relocs. We can't decide accurately between function and
1889 non-function syms in check-relocs; Objects loaded later in
1890 the link may change h->type. So fix it now. */
1891 h->plt.offset = (bfd_vma) -1;
1892
1893 /* If this is a weak symbol, and there is a real definition, the
1894 processor independent code will have arranged for us to see the
1895 real definition first, and we can just use the same value. */
1896 if (h->u.weakdef != NULL)
1897 {
1898 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1899 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1900 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1901 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1902 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1903 h->non_got_ref = h->u.weakdef->non_got_ref;
1904 return TRUE;
1905 }
1906
1907 /* This is a reference to a symbol defined by a dynamic object which
1908 is not a function. */
1909
1910 /* If we are creating a shared library, we must presume that the
1911 only references to the symbol are via the global offset table.
1912 For such cases we need not do anything here; the relocations will
1913 be handled correctly by relocate_section. */
1914 if (info->shared)
1915 return TRUE;
1916
1917 /* If there are no references to this symbol that do not use the
1918 GOT, we don't need to generate a copy reloc. */
1919 if (!h->non_got_ref)
1920 return TRUE;
1921
1922 /* If -z nocopyreloc was given, we won't generate them either. */
1923 if (info->nocopyreloc)
1924 {
1925 h->non_got_ref = 0;
1926 return TRUE;
1927 }
1928
1929 if (ELIMINATE_COPY_RELOCS)
1930 {
1931 struct elf_x86_64_link_hash_entry * eh;
1932 struct elf_dyn_relocs *p;
1933
1934 eh = (struct elf_x86_64_link_hash_entry *) h;
1935 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1936 {
1937 s = p->sec->output_section;
1938 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1939 break;
1940 }
1941
1942 /* If we didn't find any dynamic relocs in read-only sections, then
1943 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1944 if (p == NULL)
1945 {
1946 h->non_got_ref = 0;
1947 return TRUE;
1948 }
1949 }
1950
1951 if (h->size == 0)
1952 {
1953 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1954 h->root.root.string);
1955 return TRUE;
1956 }
1957
1958 /* We must allocate the symbol in our .dynbss section, which will
1959 become part of the .bss section of the executable. There will be
1960 an entry for this symbol in the .dynsym section. The dynamic
1961 object will contain position independent code, so all references
1962 from the dynamic object to this symbol will go through the global
1963 offset table. The dynamic linker will use the .dynsym entry to
1964 determine the address it must put in the global offset table, so
1965 both the dynamic object and the regular object will refer to the
1966 same memory location for the variable. */
1967
1968 htab = elf_x86_64_hash_table (info);
1969 if (htab == NULL)
1970 return FALSE;
1971
1972 /* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
1973 to copy the initial value out of the dynamic object and into the
1974 runtime process image. */
1975 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1976 {
1977 const struct elf_backend_data *bed;
1978 bed = get_elf_backend_data (info->output_bfd);
1979 htab->srelbss->size += bed->s->sizeof_rela;
1980 h->needs_copy = 1;
1981 }
1982
1983 s = htab->sdynbss;
1984
1985 return _bfd_elf_adjust_dynamic_copy (h, s);
1986 }
1987
1988 /* Allocate space in .plt, .got and associated reloc sections for
1989 dynamic relocs. */
1990
1991 static bfd_boolean
1992 elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
1993 {
1994 struct bfd_link_info *info;
1995 struct elf_x86_64_link_hash_table *htab;
1996 struct elf_x86_64_link_hash_entry *eh;
1997 struct elf_dyn_relocs *p;
1998 const struct elf_backend_data *bed;
1999
2000 if (h->root.type == bfd_link_hash_indirect)
2001 return TRUE;
2002
2003 if (h->root.type == bfd_link_hash_warning)
2004 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2005 eh = (struct elf_x86_64_link_hash_entry *) h;
2006
2007 info = (struct bfd_link_info *) inf;
2008 htab = elf_x86_64_hash_table (info);
2009 if (htab == NULL)
2010 return FALSE;
2011 bed = get_elf_backend_data (info->output_bfd);
2012
2013 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2014 here if it is defined and referenced in a non-shared object. */
2015 if (h->type == STT_GNU_IFUNC
2016 && h->def_regular)
2017 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2018 &eh->dyn_relocs,
2019 PLT_ENTRY_SIZE,
2020 GOT_ENTRY_SIZE);
2021 else if (htab->elf.dynamic_sections_created
2022 && h->plt.refcount > 0)
2023 {
2024 /* Make sure this symbol is output as a dynamic symbol.
2025 Undefined weak syms won't yet be marked as dynamic. */
2026 if (h->dynindx == -1
2027 && !h->forced_local)
2028 {
2029 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2030 return FALSE;
2031 }
2032
2033 if (info->shared
2034 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2035 {
2036 asection *s = htab->elf.splt;
2037
2038 /* If this is the first .plt entry, make room for the special
2039 first entry. */
2040 if (s->size == 0)
2041 s->size += PLT_ENTRY_SIZE;
2042
2043 h->plt.offset = s->size;
2044
2045 /* If this symbol is not defined in a regular file, and we are
2046 not generating a shared library, then set the symbol to this
2047 location in the .plt. This is required to make function
2048 pointers compare as equal between the normal executable and
2049 the shared library. */
2050 if (! info->shared
2051 && !h->def_regular)
2052 {
2053 h->root.u.def.section = s;
2054 h->root.u.def.value = h->plt.offset;
2055 }
2056
2057 /* Make room for this entry. */
2058 s->size += PLT_ENTRY_SIZE;
2059
2060 /* We also need to make an entry in the .got.plt section, which
2061 will be placed in the .got section by the linker script. */
2062 htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
2063
2064 /* We also need to make an entry in the .rela.plt section. */
2065 htab->elf.srelplt->size += bed->s->sizeof_rela;
2066 htab->elf.srelplt->reloc_count++;
2067 }
2068 else
2069 {
2070 h->plt.offset = (bfd_vma) -1;
2071 h->needs_plt = 0;
2072 }
2073 }
2074 else
2075 {
2076 h->plt.offset = (bfd_vma) -1;
2077 h->needs_plt = 0;
2078 }
2079
2080 eh->tlsdesc_got = (bfd_vma) -1;
2081
2082 /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
2083 make it a R_X86_64_TPOFF32 requiring no GOT entry. */
2084 if (h->got.refcount > 0
2085 && info->executable
2086 && h->dynindx == -1
2087 && elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
2088 {
2089 h->got.offset = (bfd_vma) -1;
2090 }
2091 else if (h->got.refcount > 0)
2092 {
2093 asection *s;
2094 bfd_boolean dyn;
2095 int tls_type = elf_x86_64_hash_entry (h)->tls_type;
2096
2097 /* Make sure this symbol is output as a dynamic symbol.
2098 Undefined weak syms won't yet be marked as dynamic. */
2099 if (h->dynindx == -1
2100 && !h->forced_local)
2101 {
2102 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2103 return FALSE;
2104 }
2105
2106 if (GOT_TLS_GDESC_P (tls_type))
2107 {
2108 eh->tlsdesc_got = htab->elf.sgotplt->size
2109 - elf_x86_64_compute_jump_table_size (htab);
2110 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2111 h->got.offset = (bfd_vma) -2;
2112 }
2113 if (! GOT_TLS_GDESC_P (tls_type)
2114 || GOT_TLS_GD_P (tls_type))
2115 {
2116 s = htab->elf.sgot;
2117 h->got.offset = s->size;
2118 s->size += GOT_ENTRY_SIZE;
2119 if (GOT_TLS_GD_P (tls_type))
2120 s->size += GOT_ENTRY_SIZE;
2121 }
2122 dyn = htab->elf.dynamic_sections_created;
2123 /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
2124 and two if global.
2125 R_X86_64_GOTTPOFF needs one dynamic relocation. */
2126 if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2127 || tls_type == GOT_TLS_IE)
2128 htab->elf.srelgot->size += bed->s->sizeof_rela;
2129 else if (GOT_TLS_GD_P (tls_type))
2130 htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
2131 else if (! GOT_TLS_GDESC_P (tls_type)
2132 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2133 || h->root.type != bfd_link_hash_undefweak)
2134 && (info->shared
2135 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2136 htab->elf.srelgot->size += bed->s->sizeof_rela;
2137 if (GOT_TLS_GDESC_P (tls_type))
2138 {
2139 htab->elf.srelplt->size += bed->s->sizeof_rela;
2140 htab->tlsdesc_plt = (bfd_vma) -1;
2141 }
2142 }
2143 else
2144 h->got.offset = (bfd_vma) -1;
2145
2146 if (eh->dyn_relocs == NULL)
2147 return TRUE;
2148
2149 /* In the shared -Bsymbolic case, discard space allocated for
2150 dynamic pc-relative relocs against symbols which turn out to be
2151 defined in regular objects. For the normal shared case, discard
2152 space for pc-relative relocs that have become local due to symbol
2153 visibility changes. */
2154
2155 if (info->shared)
2156 {
2157 /* Relocs that use pc_count are those that appear on a call
2158 insn, or certain REL relocs that can generated via assembly.
2159 We want calls to protected symbols to resolve directly to the
2160 function rather than going via the plt. If people want
2161 function pointer comparisons to work as expected then they
2162 should avoid writing weird assembly. */
2163 if (SYMBOL_CALLS_LOCAL (info, h))
2164 {
2165 struct elf_dyn_relocs **pp;
2166
2167 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2168 {
2169 p->count -= p->pc_count;
2170 p->pc_count = 0;
2171 if (p->count == 0)
2172 *pp = p->next;
2173 else
2174 pp = &p->next;
2175 }
2176 }
2177
2178 /* Also discard relocs on undefined weak syms with non-default
2179 visibility. */
2180 if (eh->dyn_relocs != NULL
2181 && h->root.type == bfd_link_hash_undefweak)
2182 {
2183 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2184 eh->dyn_relocs = NULL;
2185
2186 /* Make sure undefined weak symbols are output as a dynamic
2187 symbol in PIEs. */
2188 else if (h->dynindx == -1
2189 && ! h->forced_local
2190 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2191 return FALSE;
2192 }
2193
2194 }
2195 else if (ELIMINATE_COPY_RELOCS)
2196 {
2197 /* For the non-shared case, discard space for relocs against
2198 symbols which turn out to need copy relocs or are not
2199 dynamic. */
2200
2201 if (!h->non_got_ref
2202 && ((h->def_dynamic
2203 && !h->def_regular)
2204 || (htab->elf.dynamic_sections_created
2205 && (h->root.type == bfd_link_hash_undefweak
2206 || h->root.type == bfd_link_hash_undefined))))
2207 {
2208 /* Make sure this symbol is output as a dynamic symbol.
2209 Undefined weak syms won't yet be marked as dynamic. */
2210 if (h->dynindx == -1
2211 && ! h->forced_local
2212 && ! bfd_elf_link_record_dynamic_symbol (info, h))
2213 return FALSE;
2214
2215 /* If that succeeded, we know we'll be keeping all the
2216 relocs. */
2217 if (h->dynindx != -1)
2218 goto keep;
2219 }
2220
2221 eh->dyn_relocs = NULL;
2222
2223 keep: ;
2224 }
2225
2226 /* Finally, allocate space. */
2227 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2228 {
2229 asection * sreloc;
2230
2231 sreloc = elf_section_data (p->sec)->sreloc;
2232
2233 BFD_ASSERT (sreloc != NULL);
2234
2235 sreloc->size += p->count * bed->s->sizeof_rela;
2236 }
2237
2238 return TRUE;
2239 }
2240
2241 /* Allocate space in .plt, .got and associated reloc sections for
2242 local dynamic relocs. */
2243
2244 static bfd_boolean
2245 elf_x86_64_allocate_local_dynrelocs (void **slot, void *inf)
2246 {
2247 struct elf_link_hash_entry *h
2248 = (struct elf_link_hash_entry *) *slot;
2249
2250 if (h->type != STT_GNU_IFUNC
2251 || !h->def_regular
2252 || !h->ref_regular
2253 || !h->forced_local
2254 || h->root.type != bfd_link_hash_defined)
2255 abort ();
2256
2257 return elf_x86_64_allocate_dynrelocs (h, inf);
2258 }
2259
2260 /* Find any dynamic relocs that apply to read-only sections. */
2261
2262 static bfd_boolean
2263 elf_x86_64_readonly_dynrelocs (struct elf_link_hash_entry *h,
2264 void * inf)
2265 {
2266 struct elf_x86_64_link_hash_entry *eh;
2267 struct elf_dyn_relocs *p;
2268
2269 if (h->root.type == bfd_link_hash_warning)
2270 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2271
2272 eh = (struct elf_x86_64_link_hash_entry *) h;
2273 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2274 {
2275 asection *s = p->sec->output_section;
2276
2277 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2278 {
2279 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2280
2281 info->flags |= DF_TEXTREL;
2282
2283 /* Not an error, just cut short the traversal. */
2284 return FALSE;
2285 }
2286 }
2287 return TRUE;
2288 }
2289
2290 /* Set the sizes of the dynamic sections. */
2291
2292 static bfd_boolean
2293 elf_x86_64_size_dynamic_sections (bfd *output_bfd,
2294 struct bfd_link_info *info)
2295 {
2296 struct elf_x86_64_link_hash_table *htab;
2297 bfd *dynobj;
2298 asection *s;
2299 bfd_boolean relocs;
2300 bfd *ibfd;
2301 const struct elf_backend_data *bed;
2302
2303 htab = elf_x86_64_hash_table (info);
2304 if (htab == NULL)
2305 return FALSE;
2306 bed = get_elf_backend_data (output_bfd);
2307
2308 dynobj = htab->elf.dynobj;
2309 if (dynobj == NULL)
2310 abort ();
2311
2312 if (htab->elf.dynamic_sections_created)
2313 {
2314 /* Set the contents of the .interp section to the interpreter. */
2315 if (info->executable)
2316 {
2317 s = bfd_get_section_by_name (dynobj, ".interp");
2318 if (s == NULL)
2319 abort ();
2320 s->size = htab->dynamic_interpreter_size;
2321 s->contents = (unsigned char *) htab->dynamic_interpreter;
2322 }
2323 }
2324
2325 /* Set up .got offsets for local syms, and space for local dynamic
2326 relocs. */
2327 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2328 {
2329 bfd_signed_vma *local_got;
2330 bfd_signed_vma *end_local_got;
2331 char *local_tls_type;
2332 bfd_vma *local_tlsdesc_gotent;
2333 bfd_size_type locsymcount;
2334 Elf_Internal_Shdr *symtab_hdr;
2335 asection *srel;
2336
2337 if (! is_x86_64_elf (ibfd))
2338 continue;
2339
2340 for (s = ibfd->sections; s != NULL; s = s->next)
2341 {
2342 struct elf_dyn_relocs *p;
2343
2344 for (p = (struct elf_dyn_relocs *)
2345 (elf_section_data (s)->local_dynrel);
2346 p != NULL;
2347 p = p->next)
2348 {
2349 if (!bfd_is_abs_section (p->sec)
2350 && bfd_is_abs_section (p->sec->output_section))
2351 {
2352 /* Input section has been discarded, either because
2353 it is a copy of a linkonce section or due to
2354 linker script /DISCARD/, so we'll be discarding
2355 the relocs too. */
2356 }
2357 else if (p->count != 0)
2358 {
2359 srel = elf_section_data (p->sec)->sreloc;
2360 srel->size += p->count * bed->s->sizeof_rela;
2361 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2362 info->flags |= DF_TEXTREL;
2363 }
2364 }
2365 }
2366
2367 local_got = elf_local_got_refcounts (ibfd);
2368 if (!local_got)
2369 continue;
2370
2371 symtab_hdr = &elf_symtab_hdr (ibfd);
2372 locsymcount = symtab_hdr->sh_info;
2373 end_local_got = local_got + locsymcount;
2374 local_tls_type = elf_x86_64_local_got_tls_type (ibfd);
2375 local_tlsdesc_gotent = elf_x86_64_local_tlsdesc_gotent (ibfd);
2376 s = htab->elf.sgot;
2377 srel = htab->elf.srelgot;
2378 for (; local_got < end_local_got;
2379 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2380 {
2381 *local_tlsdesc_gotent = (bfd_vma) -1;
2382 if (*local_got > 0)
2383 {
2384 if (GOT_TLS_GDESC_P (*local_tls_type))
2385 {
2386 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2387 - elf_x86_64_compute_jump_table_size (htab);
2388 htab->elf.sgotplt->size += 2 * GOT_ENTRY_SIZE;
2389 *local_got = (bfd_vma) -2;
2390 }
2391 if (! GOT_TLS_GDESC_P (*local_tls_type)
2392 || GOT_TLS_GD_P (*local_tls_type))
2393 {
2394 *local_got = s->size;
2395 s->size += GOT_ENTRY_SIZE;
2396 if (GOT_TLS_GD_P (*local_tls_type))
2397 s->size += GOT_ENTRY_SIZE;
2398 }
2399 if (info->shared
2400 || GOT_TLS_GD_ANY_P (*local_tls_type)
2401 || *local_tls_type == GOT_TLS_IE)
2402 {
2403 if (GOT_TLS_GDESC_P (*local_tls_type))
2404 {
2405 htab->elf.srelplt->size
2406 += bed->s->sizeof_rela;
2407 htab->tlsdesc_plt = (bfd_vma) -1;
2408 }
2409 if (! GOT_TLS_GDESC_P (*local_tls_type)
2410 || GOT_TLS_GD_P (*local_tls_type))
2411 srel->size += bed->s->sizeof_rela;
2412 }
2413 }
2414 else
2415 *local_got = (bfd_vma) -1;
2416 }
2417 }
2418
2419 if (htab->tls_ld_got.refcount > 0)
2420 {
2421 /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
2422 relocs. */
2423 htab->tls_ld_got.offset = htab->elf.sgot->size;
2424 htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
2425 htab->elf.srelgot->size += bed->s->sizeof_rela;
2426 }
2427 else
2428 htab->tls_ld_got.offset = -1;
2429
2430 /* Allocate global sym .plt and .got entries, and space for global
2431 sym dynamic relocs. */
2432 elf_link_hash_traverse (&htab->elf, elf_x86_64_allocate_dynrelocs,
2433 info);
2434
2435 /* Allocate .plt and .got entries, and space for local symbols. */
2436 htab_traverse (htab->loc_hash_table,
2437 elf_x86_64_allocate_local_dynrelocs,
2438 info);
2439
2440 /* For every jump slot reserved in the sgotplt, reloc_count is
2441 incremented. However, when we reserve space for TLS descriptors,
2442 it's not incremented, so in order to compute the space reserved
2443 for them, it suffices to multiply the reloc count by the jump
2444 slot size. */
2445 if (htab->elf.srelplt)
2446 htab->sgotplt_jump_table_size
2447 = elf_x86_64_compute_jump_table_size (htab);
2448
2449 if (htab->tlsdesc_plt)
2450 {
2451 /* If we're not using lazy TLS relocations, don't generate the
2452 PLT and GOT entries they require. */
2453 if ((info->flags & DF_BIND_NOW))
2454 htab->tlsdesc_plt = 0;
2455 else
2456 {
2457 htab->tlsdesc_got = htab->elf.sgot->size;
2458 htab->elf.sgot->size += GOT_ENTRY_SIZE;
2459 /* Reserve room for the initial entry.
2460 FIXME: we could probably do away with it in this case. */
2461 if (htab->elf.splt->size == 0)
2462 htab->elf.splt->size += PLT_ENTRY_SIZE;
2463 htab->tlsdesc_plt = htab->elf.splt->size;
2464 htab->elf.splt->size += PLT_ENTRY_SIZE;
2465 }
2466 }
2467
2468 if (htab->elf.sgotplt)
2469 {
2470 struct elf_link_hash_entry *got;
2471 got = elf_link_hash_lookup (elf_hash_table (info),
2472 "_GLOBAL_OFFSET_TABLE_",
2473 FALSE, FALSE, FALSE);
2474
2475 /* Don't allocate .got.plt section if there are no GOT nor PLT
2476 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2477 if ((got == NULL
2478 || !got->ref_regular_nonweak)
2479 && (htab->elf.sgotplt->size
2480 == get_elf_backend_data (output_bfd)->got_header_size)
2481 && (htab->elf.splt == NULL
2482 || htab->elf.splt->size == 0)
2483 && (htab->elf.sgot == NULL
2484 || htab->elf.sgot->size == 0)
2485 && (htab->elf.iplt == NULL
2486 || htab->elf.iplt->size == 0)
2487 && (htab->elf.igotplt == NULL
2488 || htab->elf.igotplt->size == 0))
2489 htab->elf.sgotplt->size = 0;
2490 }
2491
2492 /* We now have determined the sizes of the various dynamic sections.
2493 Allocate memory for them. */
2494 relocs = FALSE;
2495 for (s = dynobj->sections; s != NULL; s = s->next)
2496 {
2497 if ((s->flags & SEC_LINKER_CREATED) == 0)
2498 continue;
2499
2500 if (s == htab->elf.splt
2501 || s == htab->elf.sgot
2502 || s == htab->elf.sgotplt
2503 || s == htab->elf.iplt
2504 || s == htab->elf.igotplt
2505 || s == htab->sdynbss)
2506 {
2507 /* Strip this section if we don't need it; see the
2508 comment below. */
2509 }
2510 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
2511 {
2512 if (s->size != 0 && s != htab->elf.srelplt)
2513 relocs = TRUE;
2514
2515 /* We use the reloc_count field as a counter if we need
2516 to copy relocs into the output file. */
2517 if (s != htab->elf.srelplt)
2518 s->reloc_count = 0;
2519 }
2520 else
2521 {
2522 /* It's not one of our sections, so don't allocate space. */
2523 continue;
2524 }
2525
2526 if (s->size == 0)
2527 {
2528 /* If we don't need this section, strip it from the
2529 output file. This is mostly to handle .rela.bss and
2530 .rela.plt. We must create both sections in
2531 create_dynamic_sections, because they must be created
2532 before the linker maps input sections to output
2533 sections. The linker does that before
2534 adjust_dynamic_symbol is called, and it is that
2535 function which decides whether anything needs to go
2536 into these sections. */
2537
2538 s->flags |= SEC_EXCLUDE;
2539 continue;
2540 }
2541
2542 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2543 continue;
2544
2545 /* Allocate memory for the section contents. We use bfd_zalloc
2546 here in case unused entries are not reclaimed before the
2547 section's contents are written out. This should not happen,
2548 but this way if it does, we get a R_X86_64_NONE reloc instead
2549 of garbage. */
2550 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2551 if (s->contents == NULL)
2552 return FALSE;
2553 }
2554
2555 if (htab->elf.dynamic_sections_created)
2556 {
2557 /* Add some entries to the .dynamic section. We fill in the
2558 values later, in elf_x86_64_finish_dynamic_sections, but we
2559 must add the entries now so that we get the correct size for
2560 the .dynamic section. The DT_DEBUG entry is filled in by the
2561 dynamic linker and used by the debugger. */
2562 #define add_dynamic_entry(TAG, VAL) \
2563 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2564
2565 if (info->executable)
2566 {
2567 if (!add_dynamic_entry (DT_DEBUG, 0))
2568 return FALSE;
2569 }
2570
2571 if (htab->elf.splt->size != 0)
2572 {
2573 if (!add_dynamic_entry (DT_PLTGOT, 0)
2574 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2575 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2576 || !add_dynamic_entry (DT_JMPREL, 0))
2577 return FALSE;
2578
2579 if (htab->tlsdesc_plt
2580 && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
2581 || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
2582 return FALSE;
2583 }
2584
2585 if (relocs)
2586 {
2587 if (!add_dynamic_entry (DT_RELA, 0)
2588 || !add_dynamic_entry (DT_RELASZ, 0)
2589 || !add_dynamic_entry (DT_RELAENT, bed->s->sizeof_rela))
2590 return FALSE;
2591
2592 /* If any dynamic relocs apply to a read-only section,
2593 then we need a DT_TEXTREL entry. */
2594 if ((info->flags & DF_TEXTREL) == 0)
2595 elf_link_hash_traverse (&htab->elf,
2596 elf_x86_64_readonly_dynrelocs,
2597 info);
2598
2599 if ((info->flags & DF_TEXTREL) != 0)
2600 {
2601 if (!add_dynamic_entry (DT_TEXTREL, 0))
2602 return FALSE;
2603 }
2604 }
2605 }
2606 #undef add_dynamic_entry
2607
2608 return TRUE;
2609 }
2610
2611 static bfd_boolean
2612 elf_x86_64_always_size_sections (bfd *output_bfd,
2613 struct bfd_link_info *info)
2614 {
2615 asection *tls_sec = elf_hash_table (info)->tls_sec;
2616
2617 if (tls_sec)
2618 {
2619 struct elf_link_hash_entry *tlsbase;
2620
2621 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2622 "_TLS_MODULE_BASE_",
2623 FALSE, FALSE, FALSE);
2624
2625 if (tlsbase && tlsbase->type == STT_TLS)
2626 {
2627 struct elf_x86_64_link_hash_table *htab;
2628 struct bfd_link_hash_entry *bh = NULL;
2629 const struct elf_backend_data *bed
2630 = get_elf_backend_data (output_bfd);
2631
2632 htab = elf_x86_64_hash_table (info);
2633 if (htab == NULL)
2634 return FALSE;
2635
2636 if (!(_bfd_generic_link_add_one_symbol
2637 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2638 tls_sec, 0, NULL, FALSE,
2639 bed->collect, &bh)))
2640 return FALSE;
2641
2642 htab->tls_module_base = bh;
2643
2644 tlsbase = (struct elf_link_hash_entry *)bh;
2645 tlsbase->def_regular = 1;
2646 tlsbase->other = STV_HIDDEN;
2647 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2648 }
2649 }
2650
2651 return TRUE;
2652 }
2653
2654 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2655 executables. Rather than setting it to the beginning of the TLS
2656 section, we have to set it to the end. This function may be called
2657 multiple times, it is idempotent. */
2658
2659 static void
2660 elf_x86_64_set_tls_module_base (struct bfd_link_info *info)
2661 {
2662 struct elf_x86_64_link_hash_table *htab;
2663 struct bfd_link_hash_entry *base;
2664
2665 if (!info->executable)
2666 return;
2667
2668 htab = elf_x86_64_hash_table (info);
2669 if (htab == NULL)
2670 return;
2671
2672 base = htab->tls_module_base;
2673 if (base == NULL)
2674 return;
2675
2676 base->u.def.value = htab->elf.tls_size;
2677 }
2678
2679 /* Return the base VMA address which should be subtracted from real addresses
2680 when resolving @dtpoff relocation.
2681 This is PT_TLS segment p_vaddr. */
2682
2683 static bfd_vma
2684 elf_x86_64_dtpoff_base (struct bfd_link_info *info)
2685 {
2686 /* If tls_sec is NULL, we should have signalled an error already. */
2687 if (elf_hash_table (info)->tls_sec == NULL)
2688 return 0;
2689 return elf_hash_table (info)->tls_sec->vma;
2690 }
2691
2692 /* Return the relocation value for @tpoff relocation
2693 if STT_TLS virtual address is ADDRESS. */
2694
2695 static bfd_vma
2696 elf_x86_64_tpoff (struct bfd_link_info *info, bfd_vma address)
2697 {
2698 struct elf_link_hash_table *htab = elf_hash_table (info);
2699 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2700 bfd_vma static_tls_size;
2701
2702 /* If tls_segment is NULL, we should have signalled an error already. */
2703 if (htab->tls_sec == NULL)
2704 return 0;
2705
2706 /* Consider special static TLS alignment requirements. */
2707 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2708 return address - static_tls_size - htab->tls_sec->vma;
2709 }
2710
2711 /* Is the instruction before OFFSET in CONTENTS a 32bit relative
2712 branch? */
2713
2714 static bfd_boolean
2715 is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
2716 {
2717 /* Opcode Instruction
2718 0xe8 call
2719 0xe9 jump
2720 0x0f 0x8x conditional jump */
2721 return ((offset > 0
2722 && (contents [offset - 1] == 0xe8
2723 || contents [offset - 1] == 0xe9))
2724 || (offset > 1
2725 && contents [offset - 2] == 0x0f
2726 && (contents [offset - 1] & 0xf0) == 0x80));
2727 }
2728
2729 /* Relocate an x86_64 ELF section. */
2730
2731 static bfd_boolean
2732 elf_x86_64_relocate_section (bfd *output_bfd,
2733 struct bfd_link_info *info,
2734 bfd *input_bfd,
2735 asection *input_section,
2736 bfd_byte *contents,
2737 Elf_Internal_Rela *relocs,
2738 Elf_Internal_Sym *local_syms,
2739 asection **local_sections)
2740 {
2741 struct elf_x86_64_link_hash_table *htab;
2742 Elf_Internal_Shdr *symtab_hdr;
2743 struct elf_link_hash_entry **sym_hashes;
2744 bfd_vma *local_got_offsets;
2745 bfd_vma *local_tlsdesc_gotents;
2746 Elf_Internal_Rela *rel;
2747 Elf_Internal_Rela *relend;
2748
2749 BFD_ASSERT (is_x86_64_elf (input_bfd));
2750
2751 htab = elf_x86_64_hash_table (info);
2752 if (htab == NULL)
2753 return FALSE;
2754 symtab_hdr = &elf_symtab_hdr (input_bfd);
2755 sym_hashes = elf_sym_hashes (input_bfd);
2756 local_got_offsets = elf_local_got_offsets (input_bfd);
2757 local_tlsdesc_gotents = elf_x86_64_local_tlsdesc_gotent (input_bfd);
2758
2759 elf_x86_64_set_tls_module_base (info);
2760
2761 rel = relocs;
2762 relend = relocs + input_section->reloc_count;
2763 for (; rel < relend; rel++)
2764 {
2765 unsigned int r_type;
2766 reloc_howto_type *howto;
2767 unsigned long r_symndx;
2768 struct elf_link_hash_entry *h;
2769 Elf_Internal_Sym *sym;
2770 asection *sec;
2771 bfd_vma off, offplt;
2772 bfd_vma relocation;
2773 bfd_boolean unresolved_reloc;
2774 bfd_reloc_status_type r;
2775 int tls_type;
2776 asection *base_got;
2777
2778 r_type = ELF32_R_TYPE (rel->r_info);
2779 if (r_type == (int) R_X86_64_GNU_VTINHERIT
2780 || r_type == (int) R_X86_64_GNU_VTENTRY)
2781 continue;
2782
2783 if (r_type >= R_X86_64_max)
2784 {
2785 bfd_set_error (bfd_error_bad_value);
2786 return FALSE;
2787 }
2788
2789 howto = x86_64_elf_howto_table + r_type;
2790 r_symndx = htab->r_sym (rel->r_info);
2791 h = NULL;
2792 sym = NULL;
2793 sec = NULL;
2794 unresolved_reloc = FALSE;
2795 if (r_symndx < symtab_hdr->sh_info)
2796 {
2797 sym = local_syms + r_symndx;
2798 sec = local_sections[r_symndx];
2799
2800 relocation = _bfd_elf_rela_local_sym (output_bfd, sym,
2801 &sec, rel);
2802
2803 /* Relocate against local STT_GNU_IFUNC symbol. */
2804 if (!info->relocatable
2805 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2806 {
2807 h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
2808 rel, FALSE);
2809 if (h == NULL)
2810 abort ();
2811
2812 /* Set STT_GNU_IFUNC symbol value. */
2813 h->root.u.def.value = sym->st_value;
2814 h->root.u.def.section = sec;
2815 }
2816 }
2817 else
2818 {
2819 bfd_boolean warned ATTRIBUTE_UNUSED;
2820
2821 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2822 r_symndx, symtab_hdr, sym_hashes,
2823 h, sec, relocation,
2824 unresolved_reloc, warned);
2825 }
2826
2827 if (sec != NULL && elf_discarded_section (sec))
2828 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
2829 rel, relend, howto, contents);
2830
2831 if (info->relocatable)
2832 continue;
2833
2834 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2835 it here if it is defined in a non-shared object. */
2836 if (h != NULL
2837 && h->type == STT_GNU_IFUNC
2838 && h->def_regular)
2839 {
2840 asection *plt;
2841 bfd_vma plt_index;
2842 const char *name;
2843
2844 if ((input_section->flags & SEC_ALLOC) == 0
2845 || h->plt.offset == (bfd_vma) -1)
2846 abort ();
2847
2848 /* STT_GNU_IFUNC symbol must go through PLT. */
2849 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
2850 relocation = (plt->output_section->vma
2851 + plt->output_offset + h->plt.offset);
2852
2853 switch (r_type)
2854 {
2855 default:
2856 if (h->root.root.string)
2857 name = h->root.root.string;
2858 else
2859 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2860 NULL);
2861 (*_bfd_error_handler)
2862 (_("%B: relocation %s against STT_GNU_IFUNC "
2863 "symbol `%s' isn't handled by %s"), input_bfd,
2864 x86_64_elf_howto_table[r_type].name,
2865 name, __FUNCTION__);
2866 bfd_set_error (bfd_error_bad_value);
2867 return FALSE;
2868
2869 case R_X86_64_32S:
2870 if (info->shared)
2871 abort ();
2872 goto do_relocation;
2873
2874 case R_X86_64_32:
2875 if (ABI_64_P (output_bfd))
2876 goto do_relocation;
2877 case R_X86_64_64:
2878 if (rel->r_addend != 0)
2879 {
2880 if (h->root.root.string)
2881 name = h->root.root.string;
2882 else
2883 name = bfd_elf_sym_name (input_bfd, symtab_hdr,
2884 sym, NULL);
2885 (*_bfd_error_handler)
2886 (_("%B: relocation %s against STT_GNU_IFUNC "
2887 "symbol `%s' has non-zero addend: %d"),
2888 input_bfd, x86_64_elf_howto_table[r_type].name,
2889 name, rel->r_addend);
2890 bfd_set_error (bfd_error_bad_value);
2891 return FALSE;
2892 }
2893
2894 /* Generate dynamic relcoation only when there is a
2895 non-GOF reference in a shared object. */
2896 if (info->shared && h->non_got_ref)
2897 {
2898 Elf_Internal_Rela outrel;
2899 asection *sreloc;
2900
2901 /* Need a dynamic relocation to get the real function
2902 address. */
2903 outrel.r_offset = _bfd_elf_section_offset (output_bfd,
2904 info,
2905 input_section,
2906 rel->r_offset);
2907 if (outrel.r_offset == (bfd_vma) -1
2908 || outrel.r_offset == (bfd_vma) -2)
2909 abort ();
2910
2911 outrel.r_offset += (input_section->output_section->vma
2912 + input_section->output_offset);
2913
2914 if (h->dynindx == -1
2915 || h->forced_local
2916 || info->executable)
2917 {
2918 /* This symbol is resolved locally. */
2919 outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
2920 outrel.r_addend = (h->root.u.def.value
2921 + h->root.u.def.section->output_section->vma
2922 + h->root.u.def.section->output_offset);
2923 }
2924 else
2925 {
2926 outrel.r_info = htab->r_info (h->dynindx, r_type);
2927 outrel.r_addend = 0;
2928 }
2929
2930 sreloc = htab->elf.irelifunc;
2931 elf_append_rela (output_bfd, sreloc, &outrel);
2932
2933 /* If this reloc is against an external symbol, we
2934 do not want to fiddle with the addend. Otherwise,
2935 we need to include the symbol value so that it
2936 becomes an addend for the dynamic reloc. For an
2937 internal symbol, we have updated addend. */
2938 continue;
2939 }
2940
2941 case R_X86_64_PC32:
2942 case R_X86_64_PC64:
2943 case R_X86_64_PLT32:
2944 goto do_relocation;
2945
2946 case R_X86_64_GOTPCREL:
2947 case R_X86_64_GOTPCREL64:
2948 base_got = htab->elf.sgot;
2949 off = h->got.offset;
2950
2951 if (base_got == NULL)
2952 abort ();
2953
2954 if (off == (bfd_vma) -1)
2955 {
2956 /* We can't use h->got.offset here to save state, or
2957 even just remember the offset, as finish_dynamic_symbol
2958 would use that as offset into .got. */
2959
2960 if (htab->elf.splt != NULL)
2961 {
2962 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2963 off = (plt_index + 3) * GOT_ENTRY_SIZE;
2964 base_got = htab->elf.sgotplt;
2965 }
2966 else
2967 {
2968 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
2969 off = plt_index * GOT_ENTRY_SIZE;
2970 base_got = htab->elf.igotplt;
2971 }
2972
2973 if (h->dynindx == -1
2974 || h->forced_local
2975 || info->symbolic)
2976 {
2977 /* This references the local defitionion. We must
2978 initialize this entry in the global offset table.
2979 Since the offset must always be a multiple of 8,
2980 we use the least significant bit to record
2981 whether we have initialized it already.
2982
2983 When doing a dynamic link, we create a .rela.got
2984 relocation entry to initialize the value. This
2985 is done in the finish_dynamic_symbol routine. */
2986 if ((off & 1) != 0)
2987 off &= ~1;
2988 else
2989 {
2990 bfd_put_64 (output_bfd, relocation,
2991 base_got->contents + off);
2992 /* Note that this is harmless for the GOTPLT64
2993 case, as -1 | 1 still is -1. */
2994 h->got.offset |= 1;
2995 }
2996 }
2997 }
2998
2999 relocation = (base_got->output_section->vma
3000 + base_got->output_offset + off);
3001
3002 if (r_type != R_X86_64_GOTPCREL
3003 && r_type != R_X86_64_GOTPCREL64)
3004 {
3005 asection *gotplt;
3006 if (htab->elf.splt != NULL)
3007 gotplt = htab->elf.sgotplt;
3008 else
3009 gotplt = htab->elf.igotplt;
3010 relocation -= (gotplt->output_section->vma
3011 - gotplt->output_offset);
3012 }
3013
3014 goto do_relocation;
3015 }
3016 }
3017
3018 /* When generating a shared object, the relocations handled here are
3019 copied into the output file to be resolved at run time. */
3020 switch (r_type)
3021 {
3022 case R_X86_64_GOT32:
3023 case R_X86_64_GOT64:
3024 /* Relocation is to the entry for this symbol in the global
3025 offset table. */
3026 case R_X86_64_GOTPCREL:
3027 case R_X86_64_GOTPCREL64:
3028 /* Use global offset table entry as symbol value. */
3029 case R_X86_64_GOTPLT64:
3030 /* This is the same as GOT64 for relocation purposes, but
3031 indicates the existence of a PLT entry. The difficulty is,
3032 that we must calculate the GOT slot offset from the PLT
3033 offset, if this symbol got a PLT entry (it was global).
3034 Additionally if it's computed from the PLT entry, then that
3035 GOT offset is relative to .got.plt, not to .got. */
3036 base_got = htab->elf.sgot;
3037
3038 if (htab->elf.sgot == NULL)
3039 abort ();
3040
3041 if (h != NULL)
3042 {
3043 bfd_boolean dyn;
3044
3045 off = h->got.offset;
3046 if (h->needs_plt
3047 && h->plt.offset != (bfd_vma)-1
3048 && off == (bfd_vma)-1)
3049 {
3050 /* We can't use h->got.offset here to save
3051 state, or even just remember the offset, as
3052 finish_dynamic_symbol would use that as offset into
3053 .got. */
3054 bfd_vma plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3055 off = (plt_index + 3) * GOT_ENTRY_SIZE;
3056 base_got = htab->elf.sgotplt;
3057 }
3058
3059 dyn = htab->elf.dynamic_sections_created;
3060
3061 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3062 || (info->shared
3063 && SYMBOL_REFERENCES_LOCAL (info, h))
3064 || (ELF_ST_VISIBILITY (h->other)
3065 && h->root.type == bfd_link_hash_undefweak))
3066 {
3067 /* This is actually a static link, or it is a -Bsymbolic
3068 link and the symbol is defined locally, or the symbol
3069 was forced to be local because of a version file. We
3070 must initialize this entry in the global offset table.
3071 Since the offset must always be a multiple of 8, we
3072 use the least significant bit to record whether we
3073 have initialized it already.
3074
3075 When doing a dynamic link, we create a .rela.got
3076 relocation entry to initialize the value. This is
3077 done in the finish_dynamic_symbol routine. */
3078 if ((off & 1) != 0)
3079 off &= ~1;
3080 else
3081 {
3082 bfd_put_64 (output_bfd, relocation,
3083 base_got->contents + off);
3084 /* Note that this is harmless for the GOTPLT64 case,
3085 as -1 | 1 still is -1. */
3086 h->got.offset |= 1;
3087 }
3088 }
3089 else
3090 unresolved_reloc = FALSE;
3091 }
3092 else
3093 {
3094 if (local_got_offsets == NULL)
3095 abort ();
3096
3097 off = local_got_offsets[r_symndx];
3098
3099 /* The offset must always be a multiple of 8. We use
3100 the least significant bit to record whether we have
3101 already generated the necessary reloc. */
3102 if ((off & 1) != 0)
3103 off &= ~1;
3104 else
3105 {
3106 bfd_put_64 (output_bfd, relocation,
3107 base_got->contents + off);
3108
3109 if (info->shared)
3110 {
3111 asection *s;
3112 Elf_Internal_Rela outrel;
3113
3114 /* We need to generate a R_X86_64_RELATIVE reloc
3115 for the dynamic linker. */
3116 s = htab->elf.srelgot;
3117 if (s == NULL)
3118 abort ();
3119
3120 outrel.r_offset = (base_got->output_section->vma
3121 + base_got->output_offset
3122 + off);
3123 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3124 outrel.r_addend = relocation;
3125 elf_append_rela (output_bfd, s, &outrel);
3126 }
3127
3128 local_got_offsets[r_symndx] |= 1;
3129 }
3130 }
3131
3132 if (off >= (bfd_vma) -2)
3133 abort ();
3134
3135 relocation = base_got->output_section->vma
3136 + base_got->output_offset + off;
3137 if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
3138 relocation -= htab->elf.sgotplt->output_section->vma
3139 - htab->elf.sgotplt->output_offset;
3140
3141 break;
3142
3143 case R_X86_64_GOTOFF64:
3144 /* Relocation is relative to the start of the global offset
3145 table. */
3146
3147 /* Check to make sure it isn't a protected function symbol
3148 for shared library since it may not be local when used
3149 as function address. */
3150 if (info->shared
3151 && h
3152 && h->def_regular
3153 && h->type == STT_FUNC
3154 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3155 {
3156 (*_bfd_error_handler)
3157 (_("%B: relocation R_X86_64_GOTOFF64 against protected function `%s' can not be used when making a shared object"),
3158 input_bfd, h->root.root.string);
3159 bfd_set_error (bfd_error_bad_value);
3160 return FALSE;
3161 }
3162
3163 /* Note that sgot is not involved in this
3164 calculation. We always want the start of .got.plt. If we
3165 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3166 permitted by the ABI, we might have to change this
3167 calculation. */
3168 relocation -= htab->elf.sgotplt->output_section->vma
3169 + htab->elf.sgotplt->output_offset;
3170 break;
3171
3172 case R_X86_64_GOTPC32:
3173 case R_X86_64_GOTPC64:
3174 /* Use global offset table as symbol value. */
3175 relocation = htab->elf.sgotplt->output_section->vma
3176 + htab->elf.sgotplt->output_offset;
3177 unresolved_reloc = FALSE;
3178 break;
3179
3180 case R_X86_64_PLTOFF64:
3181 /* Relocation is PLT entry relative to GOT. For local
3182 symbols it's the symbol itself relative to GOT. */
3183 if (h != NULL
3184 /* See PLT32 handling. */
3185 && h->plt.offset != (bfd_vma) -1
3186 && htab->elf.splt != NULL)
3187 {
3188 relocation = (htab->elf.splt->output_section->vma
3189 + htab->elf.splt->output_offset
3190 + h->plt.offset);
3191 unresolved_reloc = FALSE;
3192 }
3193
3194 relocation -= htab->elf.sgotplt->output_section->vma
3195 + htab->elf.sgotplt->output_offset;
3196 break;
3197
3198 case R_X86_64_PLT32:
3199 /* Relocation is to the entry for this symbol in the
3200 procedure linkage table. */
3201
3202 /* Resolve a PLT32 reloc against a local symbol directly,
3203 without using the procedure linkage table. */
3204 if (h == NULL)
3205 break;
3206
3207 if (h->plt.offset == (bfd_vma) -1
3208 || htab->elf.splt == NULL)
3209 {
3210 /* We didn't make a PLT entry for this symbol. This
3211 happens when statically linking PIC code, or when
3212 using -Bsymbolic. */
3213 break;
3214 }
3215
3216 relocation = (htab->elf.splt->output_section->vma
3217 + htab->elf.splt->output_offset
3218 + h->plt.offset);
3219 unresolved_reloc = FALSE;
3220 break;
3221
3222 case R_X86_64_PC8:
3223 case R_X86_64_PC16:
3224 case R_X86_64_PC32:
3225 if (info->shared
3226 && ABI_64_P (output_bfd)
3227 && (input_section->flags & SEC_ALLOC) != 0
3228 && (input_section->flags & SEC_READONLY) != 0
3229 && h != NULL)
3230 {
3231 bfd_boolean fail = FALSE;
3232 bfd_boolean branch
3233 = (r_type == R_X86_64_PC32
3234 && is_32bit_relative_branch (contents, rel->r_offset));
3235
3236 if (SYMBOL_REFERENCES_LOCAL (info, h))
3237 {
3238 /* Symbol is referenced locally. Make sure it is
3239 defined locally or for a branch. */
3240 fail = !h->def_regular && !branch;
3241 }
3242 else
3243 {
3244 /* Symbol isn't referenced locally. We only allow
3245 branch to symbol with non-default visibility. */
3246 fail = (!branch
3247 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
3248 }
3249
3250 if (fail)
3251 {
3252 const char *fmt;
3253 const char *v;
3254 const char *pic = "";
3255
3256 switch (ELF_ST_VISIBILITY (h->other))
3257 {
3258 case STV_HIDDEN:
3259 v = _("hidden symbol");
3260 break;
3261 case STV_INTERNAL:
3262 v = _("internal symbol");
3263 break;
3264 case STV_PROTECTED:
3265 v = _("protected symbol");
3266 break;
3267 default:
3268 v = _("symbol");
3269 pic = _("; recompile with -fPIC");
3270 break;
3271 }
3272
3273 if (h->def_regular)
3274 fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
3275 else
3276 fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
3277
3278 (*_bfd_error_handler) (fmt, input_bfd,
3279 x86_64_elf_howto_table[r_type].name,
3280 v, h->root.root.string, pic);
3281 bfd_set_error (bfd_error_bad_value);
3282 return FALSE;
3283 }
3284 }
3285 /* Fall through. */
3286
3287 case R_X86_64_8:
3288 case R_X86_64_16:
3289 case R_X86_64_32:
3290 case R_X86_64_PC64:
3291 case R_X86_64_64:
3292 /* FIXME: The ABI says the linker should make sure the value is
3293 the same when it's zeroextended to 64 bit. */
3294
3295 if ((input_section->flags & SEC_ALLOC) == 0)
3296 break;
3297
3298 if ((info->shared
3299 && (h == NULL
3300 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3301 || h->root.type != bfd_link_hash_undefweak)
3302 && (! IS_X86_64_PCREL_TYPE (r_type)
3303 || ! SYMBOL_CALLS_LOCAL (info, h)))
3304 || (ELIMINATE_COPY_RELOCS
3305 && !info->shared
3306 && h != NULL
3307 && h->dynindx != -1
3308 && !h->non_got_ref
3309 && ((h->def_dynamic
3310 && !h->def_regular)
3311 || h->root.type == bfd_link_hash_undefweak
3312 || h->root.type == bfd_link_hash_undefined)))
3313 {
3314 Elf_Internal_Rela outrel;
3315 bfd_boolean skip, relocate;
3316 asection *sreloc;
3317
3318 /* When generating a shared object, these relocations
3319 are copied into the output file to be resolved at run
3320 time. */
3321 skip = FALSE;
3322 relocate = FALSE;
3323
3324 outrel.r_offset =
3325 _bfd_elf_section_offset (output_bfd, info, input_section,
3326 rel->r_offset);
3327 if (outrel.r_offset == (bfd_vma) -1)
3328 skip = TRUE;
3329 else if (outrel.r_offset == (bfd_vma) -2)
3330 skip = TRUE, relocate = TRUE;
3331
3332 outrel.r_offset += (input_section->output_section->vma
3333 + input_section->output_offset);
3334
3335 if (skip)
3336 memset (&outrel, 0, sizeof outrel);
3337
3338 /* h->dynindx may be -1 if this symbol was marked to
3339 become local. */
3340 else if (h != NULL
3341 && h->dynindx != -1
3342 && (IS_X86_64_PCREL_TYPE (r_type)
3343 || ! info->shared
3344 || ! SYMBOLIC_BIND (info, h)
3345 || ! h->def_regular))
3346 {
3347 outrel.r_info = htab->r_info (h->dynindx, r_type);
3348 outrel.r_addend = rel->r_addend;
3349 }
3350 else
3351 {
3352 /* This symbol is local, or marked to become local. */
3353 if (r_type == htab->pointer_r_type)
3354 {
3355 relocate = TRUE;
3356 outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
3357 outrel.r_addend = relocation + rel->r_addend;
3358 }
3359 else
3360 {
3361 long sindx;
3362
3363 if (bfd_is_abs_section (sec))
3364 sindx = 0;
3365 else if (sec == NULL || sec->owner == NULL)
3366 {
3367 bfd_set_error (bfd_error_bad_value);
3368 return FALSE;
3369 }
3370 else
3371 {
3372 asection *osec;
3373
3374 /* We are turning this relocation into one
3375 against a section symbol. It would be
3376 proper to subtract the symbol's value,
3377 osec->vma, from the emitted reloc addend,
3378 but ld.so expects buggy relocs. */
3379 osec = sec->output_section;
3380 sindx = elf_section_data (osec)->dynindx;
3381 if (sindx == 0)
3382 {
3383 asection *oi = htab->elf.text_index_section;
3384 sindx = elf_section_data (oi)->dynindx;
3385 }
3386 BFD_ASSERT (sindx != 0);
3387 }
3388
3389 outrel.r_info = htab->r_info (sindx, r_type);
3390 outrel.r_addend = relocation + rel->r_addend;
3391 }
3392 }
3393
3394 sreloc = elf_section_data (input_section)->sreloc;
3395
3396 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3397
3398 elf_append_rela (output_bfd, sreloc, &outrel);
3399
3400 /* If this reloc is against an external symbol, we do
3401 not want to fiddle with the addend. Otherwise, we
3402 need to include the symbol value so that it becomes
3403 an addend for the dynamic reloc. */
3404 if (! relocate)
3405 continue;
3406 }
3407
3408 break;
3409
3410 case R_X86_64_TLSGD:
3411 case R_X86_64_GOTPC32_TLSDESC:
3412 case R_X86_64_TLSDESC_CALL:
3413 case R_X86_64_GOTTPOFF:
3414 tls_type = GOT_UNKNOWN;
3415 if (h == NULL && local_got_offsets)
3416 tls_type = elf_x86_64_local_got_tls_type (input_bfd) [r_symndx];
3417 else if (h != NULL)
3418 tls_type = elf_x86_64_hash_entry (h)->tls_type;
3419
3420 if (! elf_x86_64_tls_transition (info, input_bfd,
3421 input_section, contents,
3422 symtab_hdr, sym_hashes,
3423 &r_type, tls_type, rel,
3424 relend, h, r_symndx))
3425 return FALSE;
3426
3427 if (r_type == R_X86_64_TPOFF32)
3428 {
3429 bfd_vma roff = rel->r_offset;
3430
3431 BFD_ASSERT (! unresolved_reloc);
3432
3433 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3434 {
3435 /* GD->LE transition.
3436 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3437 .word 0x6666; rex64; call __tls_get_addr
3438 Change it into:
3439 movq %fs:0, %rax
3440 leaq foo@tpoff(%rax), %rax */
3441 memcpy (contents + roff - 4,
3442 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3443 16);
3444 bfd_put_32 (output_bfd,
3445 elf_x86_64_tpoff (info, relocation),
3446 contents + roff + 8);
3447 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3448 rel++;
3449 continue;
3450 }
3451 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3452 {
3453 /* GDesc -> LE transition.
3454 It's originally something like:
3455 leaq x@tlsdesc(%rip), %rax
3456
3457 Change it to:
3458 movl $x@tpoff, %rax. */
3459
3460 unsigned int val, type;
3461
3462 type = bfd_get_8 (input_bfd, contents + roff - 3);
3463 val = bfd_get_8 (input_bfd, contents + roff - 1);
3464 bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
3465 contents + roff - 3);
3466 bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
3467 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3468 contents + roff - 1);
3469 bfd_put_32 (output_bfd,
3470 elf_x86_64_tpoff (info, relocation),
3471 contents + roff);
3472 continue;
3473 }
3474 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3475 {
3476 /* GDesc -> LE transition.
3477 It's originally:
3478 call *(%rax)
3479 Turn it into:
3480 xchg %ax,%ax. */
3481 bfd_put_8 (output_bfd, 0x66, contents + roff);
3482 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3483 continue;
3484 }
3485 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
3486 {
3487 /* IE->LE transition:
3488 Originally it can be one of:
3489 movq foo@gottpoff(%rip), %reg
3490 addq foo@gottpoff(%rip), %reg
3491 We change it into:
3492 movq $foo, %reg
3493 leaq foo(%reg), %reg
3494 addq $foo, %reg. */
3495
3496 unsigned int val, type, reg;
3497
3498 val = bfd_get_8 (input_bfd, contents + roff - 3);
3499 type = bfd_get_8 (input_bfd, contents + roff - 2);
3500 reg = bfd_get_8 (input_bfd, contents + roff - 1);
3501 reg >>= 3;
3502 if (type == 0x8b)
3503 {
3504 /* movq */
3505 if (val == 0x4c)
3506 bfd_put_8 (output_bfd, 0x49,
3507 contents + roff - 3);
3508 bfd_put_8 (output_bfd, 0xc7,
3509 contents + roff - 2);
3510 bfd_put_8 (output_bfd, 0xc0 | reg,
3511 contents + roff - 1);
3512 }
3513 else if (reg == 4)
3514 {
3515 /* addq -> addq - addressing with %rsp/%r12 is
3516 special */
3517 if (val == 0x4c)
3518 bfd_put_8 (output_bfd, 0x49,
3519 contents + roff - 3);
3520 bfd_put_8 (output_bfd, 0x81,
3521 contents + roff - 2);
3522 bfd_put_8 (output_bfd, 0xc0 | reg,
3523 contents + roff - 1);
3524 }
3525 else
3526 {
3527 /* addq -> leaq */
3528 if (val == 0x4c)
3529 bfd_put_8 (output_bfd, 0x4d,
3530 contents + roff - 3);
3531 bfd_put_8 (output_bfd, 0x8d,
3532 contents + roff - 2);
3533 bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
3534 contents + roff - 1);
3535 }
3536 bfd_put_32 (output_bfd,
3537 elf_x86_64_tpoff (info, relocation),
3538 contents + roff);
3539 continue;
3540 }
3541 else
3542 BFD_ASSERT (FALSE);
3543 }
3544
3545 if (htab->elf.sgot == NULL)
3546 abort ();
3547
3548 if (h != NULL)
3549 {
3550 off = h->got.offset;
3551 offplt = elf_x86_64_hash_entry (h)->tlsdesc_got;
3552 }
3553 else
3554 {
3555 if (local_got_offsets == NULL)
3556 abort ();
3557
3558 off = local_got_offsets[r_symndx];
3559 offplt = local_tlsdesc_gotents[r_symndx];
3560 }
3561
3562 if ((off & 1) != 0)
3563 off &= ~1;
3564 else
3565 {
3566 Elf_Internal_Rela outrel;
3567 int dr_type, indx;
3568 asection *sreloc;
3569
3570 if (htab->elf.srelgot == NULL)
3571 abort ();
3572
3573 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3574
3575 if (GOT_TLS_GDESC_P (tls_type))
3576 {
3577 outrel.r_info = htab->r_info (indx, R_X86_64_TLSDESC);
3578 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt
3579 + 2 * GOT_ENTRY_SIZE <= htab->elf.sgotplt->size);
3580 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3581 + htab->elf.sgotplt->output_offset
3582 + offplt
3583 + htab->sgotplt_jump_table_size);
3584 sreloc = htab->elf.srelplt;
3585 if (indx == 0)
3586 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
3587 else
3588 outrel.r_addend = 0;
3589 elf_append_rela (output_bfd, sreloc, &outrel);
3590 }
3591
3592 sreloc = htab->elf.srelgot;
3593
3594 outrel.r_offset = (htab->elf.sgot->output_section->vma
3595 + htab->elf.sgot->output_offset + off);
3596
3597 if (GOT_TLS_GD_P (tls_type))
3598 dr_type = R_X86_64_DTPMOD64;
3599 else if (GOT_TLS_GDESC_P (tls_type))
3600 goto dr_done;
3601 else
3602 dr_type = R_X86_64_TPOFF64;
3603
3604 bfd_put_64 (output_bfd, 0, htab->elf.sgot->contents + off);
3605 outrel.r_addend = 0;
3606 if ((dr_type == R_X86_64_TPOFF64
3607 || dr_type == R_X86_64_TLSDESC) && indx == 0)
3608 outrel.r_addend = relocation - elf_x86_64_dtpoff_base (info);
3609 outrel.r_info = htab->r_info (indx, dr_type);
3610
3611 elf_append_rela (output_bfd, sreloc, &outrel);
3612
3613 if (GOT_TLS_GD_P (tls_type))
3614 {
3615 if (indx == 0)
3616 {
3617 BFD_ASSERT (! unresolved_reloc);
3618 bfd_put_64 (output_bfd,
3619 relocation - elf_x86_64_dtpoff_base (info),
3620 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3621 }
3622 else
3623 {
3624 bfd_put_64 (output_bfd, 0,
3625 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3626 outrel.r_info = htab->r_info (indx,
3627 R_X86_64_DTPOFF64);
3628 outrel.r_offset += GOT_ENTRY_SIZE;
3629 elf_append_rela (output_bfd, sreloc,
3630 &outrel);
3631 }
3632 }
3633
3634 dr_done:
3635 if (h != NULL)
3636 h->got.offset |= 1;
3637 else
3638 local_got_offsets[r_symndx] |= 1;
3639 }
3640
3641 if (off >= (bfd_vma) -2
3642 && ! GOT_TLS_GDESC_P (tls_type))
3643 abort ();
3644 if (r_type == ELF32_R_TYPE (rel->r_info))
3645 {
3646 if (r_type == R_X86_64_GOTPC32_TLSDESC
3647 || r_type == R_X86_64_TLSDESC_CALL)
3648 relocation = htab->elf.sgotplt->output_section->vma
3649 + htab->elf.sgotplt->output_offset
3650 + offplt + htab->sgotplt_jump_table_size;
3651 else
3652 relocation = htab->elf.sgot->output_section->vma
3653 + htab->elf.sgot->output_offset + off;
3654 unresolved_reloc = FALSE;
3655 }
3656 else
3657 {
3658 bfd_vma roff = rel->r_offset;
3659
3660 if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
3661 {
3662 /* GD->IE transition.
3663 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3664 .word 0x6666; rex64; call __tls_get_addr@plt
3665 Change it into:
3666 movq %fs:0, %rax
3667 addq foo@gottpoff(%rip), %rax */
3668 memcpy (contents + roff - 4,
3669 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3670 16);
3671
3672 relocation = (htab->elf.sgot->output_section->vma
3673 + htab->elf.sgot->output_offset + off
3674 - roff
3675 - input_section->output_section->vma
3676 - input_section->output_offset
3677 - 12);
3678 bfd_put_32 (output_bfd, relocation,
3679 contents + roff + 8);
3680 /* Skip R_X86_64_PLT32. */
3681 rel++;
3682 continue;
3683 }
3684 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
3685 {
3686 /* GDesc -> IE transition.
3687 It's originally something like:
3688 leaq x@tlsdesc(%rip), %rax
3689
3690 Change it to:
3691 movq x@gottpoff(%rip), %rax # before xchg %ax,%ax. */
3692
3693 /* Now modify the instruction as appropriate. To
3694 turn a leaq into a movq in the form we use it, it
3695 suffices to change the second byte from 0x8d to
3696 0x8b. */
3697 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3698
3699 bfd_put_32 (output_bfd,
3700 htab->elf.sgot->output_section->vma
3701 + htab->elf.sgot->output_offset + off
3702 - rel->r_offset
3703 - input_section->output_section->vma
3704 - input_section->output_offset
3705 - 4,
3706 contents + roff);
3707 continue;
3708 }
3709 else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
3710 {
3711 /* GDesc -> IE transition.
3712 It's originally:
3713 call *(%rax)
3714
3715 Change it to:
3716 xchg %ax, %ax. */
3717
3718 bfd_put_8 (output_bfd, 0x66, contents + roff);
3719 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3720 continue;
3721 }
3722 else
3723 BFD_ASSERT (FALSE);
3724 }
3725 break;
3726
3727 case R_X86_64_TLSLD:
3728 if (! elf_x86_64_tls_transition (info, input_bfd,
3729 input_section, contents,
3730 symtab_hdr, sym_hashes,
3731 &r_type, GOT_UNKNOWN,
3732 rel, relend, h, r_symndx))
3733 return FALSE;
3734
3735 if (r_type != R_X86_64_TLSLD)
3736 {
3737 /* LD->LE transition:
3738 leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
3739 We change it into:
3740 .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
3741
3742 BFD_ASSERT (r_type == R_X86_64_TPOFF32);
3743 memcpy (contents + rel->r_offset - 3,
3744 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3745 /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
3746 rel++;
3747 continue;
3748 }
3749
3750 if (htab->elf.sgot == NULL)
3751 abort ();
3752
3753 off = htab->tls_ld_got.offset;
3754 if (off & 1)
3755 off &= ~1;
3756 else
3757 {
3758 Elf_Internal_Rela outrel;
3759
3760 if (htab->elf.srelgot == NULL)
3761 abort ();
3762
3763 outrel.r_offset = (htab->elf.sgot->output_section->vma
3764 + htab->elf.sgot->output_offset + off);
3765
3766 bfd_put_64 (output_bfd, 0,
3767 htab->elf.sgot->contents + off);
3768 bfd_put_64 (output_bfd, 0,
3769 htab->elf.sgot->contents + off + GOT_ENTRY_SIZE);
3770 outrel.r_info = htab->r_info (0, R_X86_64_DTPMOD64);
3771 outrel.r_addend = 0;
3772 elf_append_rela (output_bfd, htab->elf.srelgot,
3773 &outrel);
3774 htab->tls_ld_got.offset |= 1;
3775 }
3776 relocation = htab->elf.sgot->output_section->vma
3777 + htab->elf.sgot->output_offset + off;
3778 unresolved_reloc = FALSE;
3779 break;
3780
3781 case R_X86_64_DTPOFF32:
3782 if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
3783 relocation -= elf_x86_64_dtpoff_base (info);
3784 else
3785 relocation = elf_x86_64_tpoff (info, relocation);
3786 break;
3787
3788 case R_X86_64_TPOFF32:
3789 BFD_ASSERT (info->executable);
3790 relocation = elf_x86_64_tpoff (info, relocation);
3791 break;
3792
3793 default:
3794 break;
3795 }
3796
3797 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3798 because such sections are not SEC_ALLOC and thus ld.so will
3799 not process them. */
3800 if (unresolved_reloc
3801 && !((input_section->flags & SEC_DEBUGGING) != 0
3802 && h->def_dynamic))
3803 (*_bfd_error_handler)
3804 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3805 input_bfd,
3806 input_section,
3807 (long) rel->r_offset,
3808 howto->name,
3809 h->root.root.string);
3810
3811 do_relocation:
3812 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3813 contents, rel->r_offset,
3814 relocation, rel->r_addend);
3815
3816 if (r != bfd_reloc_ok)
3817 {
3818 const char *name;
3819
3820 if (h != NULL)
3821 name = h->root.root.string;
3822 else
3823 {
3824 name = bfd_elf_string_from_elf_section (input_bfd,
3825 symtab_hdr->sh_link,
3826 sym->st_name);
3827 if (name == NULL)
3828 return FALSE;
3829 if (*name == '\0')
3830 name = bfd_section_name (input_bfd, sec);
3831 }
3832
3833 if (r == bfd_reloc_overflow)
3834 {
3835 if (! ((*info->callbacks->reloc_overflow)
3836 (info, (h ? &h->root : NULL), name, howto->name,
3837 (bfd_vma) 0, input_bfd, input_section,
3838 rel->r_offset)))
3839 return FALSE;
3840 }
3841 else
3842 {
3843 (*_bfd_error_handler)
3844 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3845 input_bfd, input_section,
3846 (long) rel->r_offset, name, (int) r);
3847 return FALSE;
3848 }
3849 }
3850 }
3851
3852 return TRUE;
3853 }
3854
3855 /* Finish up dynamic symbol handling. We set the contents of various
3856 dynamic sections here. */
3857
3858 static bfd_boolean
3859 elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
3860 struct bfd_link_info *info,
3861 struct elf_link_hash_entry *h,
3862 Elf_Internal_Sym *sym)
3863 {
3864 struct elf_x86_64_link_hash_table *htab;
3865
3866 htab = elf_x86_64_hash_table (info);
3867 if (htab == NULL)
3868 return FALSE;
3869
3870 if (h->plt.offset != (bfd_vma) -1)
3871 {
3872 bfd_vma plt_index;
3873 bfd_vma got_offset;
3874 Elf_Internal_Rela rela;
3875 bfd_byte *loc;
3876 asection *plt, *gotplt, *relplt;
3877 const struct elf_backend_data *bed;
3878
3879 /* When building a static executable, use .iplt, .igot.plt and
3880 .rela.iplt sections for STT_GNU_IFUNC symbols. */
3881 if (htab->elf.splt != NULL)
3882 {
3883 plt = htab->elf.splt;
3884 gotplt = htab->elf.sgotplt;
3885 relplt = htab->elf.srelplt;
3886 }
3887 else
3888 {
3889 plt = htab->elf.iplt;
3890 gotplt = htab->elf.igotplt;
3891 relplt = htab->elf.irelplt;
3892 }
3893
3894 /* This symbol has an entry in the procedure linkage table. Set
3895 it up. */
3896 if ((h->dynindx == -1
3897 && !((h->forced_local || info->executable)
3898 && h->def_regular
3899 && h->type == STT_GNU_IFUNC))
3900 || plt == NULL
3901 || gotplt == NULL
3902 || relplt == NULL)
3903 abort ();
3904
3905 /* Get the index in the procedure linkage table which
3906 corresponds to this symbol. This is the index of this symbol
3907 in all the symbols for which we are making plt entries. The
3908 first entry in the procedure linkage table is reserved.
3909
3910 Get the offset into the .got table of the entry that
3911 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
3912 bytes. The first three are reserved for the dynamic linker.
3913
3914 For static executables, we don't reserve anything. */
3915
3916 if (plt == htab->elf.splt)
3917 {
3918 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3919 got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
3920 }
3921 else
3922 {
3923 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3924 got_offset = plt_index * GOT_ENTRY_SIZE;
3925 }
3926
3927 /* Fill in the entry in the procedure linkage table. */
3928 memcpy (plt->contents + h->plt.offset, elf_x86_64_plt_entry,
3929 PLT_ENTRY_SIZE);
3930
3931 /* Insert the relocation positions of the plt section. The magic
3932 numbers at the end of the statements are the positions of the
3933 relocations in the plt section. */
3934 /* Put offset for jmp *name@GOTPCREL(%rip), since the
3935 instruction uses 6 bytes, subtract this value. */
3936 bfd_put_32 (output_bfd,
3937 (gotplt->output_section->vma
3938 + gotplt->output_offset
3939 + got_offset
3940 - plt->output_section->vma
3941 - plt->output_offset
3942 - h->plt.offset
3943 - 6),
3944 plt->contents + h->plt.offset + 2);
3945
3946 /* Don't fill PLT entry for static executables. */
3947 if (plt == htab->elf.splt)
3948 {
3949 /* Put relocation index. */
3950 bfd_put_32 (output_bfd, plt_index,
3951 plt->contents + h->plt.offset + 7);
3952 /* Put offset for jmp .PLT0. */
3953 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3954 plt->contents + h->plt.offset + 12);
3955 }
3956
3957 /* Fill in the entry in the global offset table, initially this
3958 points to the pushq instruction in the PLT which is at offset 6. */
3959 bfd_put_64 (output_bfd, (plt->output_section->vma
3960 + plt->output_offset
3961 + h->plt.offset + 6),
3962 gotplt->contents + got_offset);
3963
3964 /* Fill in the entry in the .rela.plt section. */
3965 rela.r_offset = (gotplt->output_section->vma
3966 + gotplt->output_offset
3967 + got_offset);
3968 if (h->dynindx == -1
3969 || ((info->executable
3970 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3971 && h->def_regular
3972 && h->type == STT_GNU_IFUNC))
3973 {
3974 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3975 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
3976 rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
3977 rela.r_addend = (h->root.u.def.value
3978 + h->root.u.def.section->output_section->vma
3979 + h->root.u.def.section->output_offset);
3980 }
3981 else
3982 {
3983 rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
3984 rela.r_addend = 0;
3985 }
3986
3987 bed = get_elf_backend_data (output_bfd);
3988 loc = relplt->contents + plt_index * bed->s->sizeof_rela;
3989 bed->s->swap_reloca_out (output_bfd, &rela, loc);
3990
3991 if (!h->def_regular)
3992 {
3993 /* Mark the symbol as undefined, rather than as defined in
3994 the .plt section. Leave the value if there were any
3995 relocations where pointer equality matters (this is a clue
3996 for the dynamic linker, to make function pointer
3997 comparisons work between an application and shared
3998 library), otherwise set it to zero. If a function is only
3999 called from a binary, there is no need to slow down
4000 shared libraries because of that. */
4001 sym->st_shndx = SHN_UNDEF;
4002 if (!h->pointer_equality_needed)
4003 sym->st_value = 0;
4004 }
4005 }
4006
4007 if (h->got.offset != (bfd_vma) -1
4008 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
4009 && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
4010 {
4011 Elf_Internal_Rela rela;
4012
4013 /* This symbol has an entry in the global offset table. Set it
4014 up. */
4015 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4016 abort ();
4017
4018 rela.r_offset = (htab->elf.sgot->output_section->vma
4019 + htab->elf.sgot->output_offset
4020 + (h->got.offset &~ (bfd_vma) 1));
4021
4022 /* If this is a static link, or it is a -Bsymbolic link and the
4023 symbol is defined locally or was forced to be local because
4024 of a version file, we just want to emit a RELATIVE reloc.
4025 The entry in the global offset table will already have been
4026 initialized in the relocate_section function. */
4027 if (h->def_regular
4028 && h->type == STT_GNU_IFUNC)
4029 {
4030 if (info->shared)
4031 {
4032 /* Generate R_X86_64_GLOB_DAT. */
4033 goto do_glob_dat;
4034 }
4035 else
4036 {
4037 asection *plt;
4038
4039 if (!h->pointer_equality_needed)
4040 abort ();
4041
4042 /* For non-shared object, we can't use .got.plt, which
4043 contains the real function addres if we need pointer
4044 equality. We load the GOT entry with the PLT entry. */
4045 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4046 bfd_put_64 (output_bfd, (plt->output_section->vma
4047 + plt->output_offset
4048 + h->plt.offset),
4049 htab->elf.sgot->contents + h->got.offset);
4050 return TRUE;
4051 }
4052 }
4053 else if (info->shared
4054 && SYMBOL_REFERENCES_LOCAL (info, h))
4055 {
4056 if (!h->def_regular)
4057 return FALSE;
4058 BFD_ASSERT((h->got.offset & 1) != 0);
4059 rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
4060 rela.r_addend = (h->root.u.def.value
4061 + h->root.u.def.section->output_section->vma
4062 + h->root.u.def.section->output_offset);
4063 }
4064 else
4065 {
4066 BFD_ASSERT((h->got.offset & 1) == 0);
4067 do_glob_dat:
4068 bfd_put_64 (output_bfd, (bfd_vma) 0,
4069 htab->elf.sgot->contents + h->got.offset);
4070 rela.r_info = htab->r_info (h->dynindx, R_X86_64_GLOB_DAT);
4071 rela.r_addend = 0;
4072 }
4073
4074 elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
4075 }
4076
4077 if (h->needs_copy)
4078 {
4079 Elf_Internal_Rela rela;
4080
4081 /* This symbol needs a copy reloc. Set it up. */
4082
4083 if (h->dynindx == -1
4084 || (h->root.type != bfd_link_hash_defined
4085 && h->root.type != bfd_link_hash_defweak)
4086 || htab->srelbss == NULL)
4087 abort ();
4088
4089 rela.r_offset = (h->root.u.def.value
4090 + h->root.u.def.section->output_section->vma
4091 + h->root.u.def.section->output_offset);
4092 rela.r_info = htab->r_info (h->dynindx, R_X86_64_COPY);
4093 rela.r_addend = 0;
4094 elf_append_rela (output_bfd, htab->srelbss, &rela);
4095 }
4096
4097 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4098 be NULL for local symbols. */
4099 if (sym != NULL
4100 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
4101 || h == htab->elf.hgot))
4102 sym->st_shndx = SHN_ABS;
4103
4104 return TRUE;
4105 }
4106
4107 /* Finish up local dynamic symbol handling. We set the contents of
4108 various dynamic sections here. */
4109
4110 static bfd_boolean
4111 elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf)
4112 {
4113 struct elf_link_hash_entry *h
4114 = (struct elf_link_hash_entry *) *slot;
4115 struct bfd_link_info *info
4116 = (struct bfd_link_info *) inf;
4117
4118 return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
4119 info, h, NULL);
4120 }
4121
4122 /* Used to decide how to sort relocs in an optimal manner for the
4123 dynamic linker, before writing them out. */
4124
4125 static enum elf_reloc_type_class
4126 elf_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
4127 {
4128 switch ((int) ELF32_R_TYPE (rela->r_info))
4129 {
4130 case R_X86_64_RELATIVE:
4131 return reloc_class_relative;
4132 case R_X86_64_JUMP_SLOT:
4133 return reloc_class_plt;
4134 case R_X86_64_COPY:
4135 return reloc_class_copy;
4136 default:
4137 return reloc_class_normal;
4138 }
4139 }
4140
4141 /* Finish up the dynamic sections. */
4142
4143 static bfd_boolean
4144 elf_x86_64_finish_dynamic_sections (bfd *output_bfd,
4145 struct bfd_link_info *info)
4146 {
4147 struct elf_x86_64_link_hash_table *htab;
4148 bfd *dynobj;
4149 asection *sdyn;
4150
4151 htab = elf_x86_64_hash_table (info);
4152 if (htab == NULL)
4153 return FALSE;
4154
4155 dynobj = htab->elf.dynobj;
4156 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4157
4158 if (htab->elf.dynamic_sections_created)
4159 {
4160 bfd_byte *dyncon, *dynconend;
4161 const struct elf_backend_data *bed;
4162 bfd_size_type sizeof_dyn;
4163
4164 if (sdyn == NULL || htab->elf.sgot == NULL)
4165 abort ();
4166
4167 bed = get_elf_backend_data (dynobj);
4168 sizeof_dyn = bed->s->sizeof_dyn;
4169 dyncon = sdyn->contents;
4170 dynconend = sdyn->contents + sdyn->size;
4171 for (; dyncon < dynconend; dyncon += sizeof_dyn)
4172 {
4173 Elf_Internal_Dyn dyn;
4174 asection *s;
4175
4176 (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
4177
4178 switch (dyn.d_tag)
4179 {
4180 default:
4181 continue;
4182
4183 case DT_PLTGOT:
4184 s = htab->elf.sgotplt;
4185 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4186 break;
4187
4188 case DT_JMPREL:
4189 dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
4190 break;
4191
4192 case DT_PLTRELSZ:
4193 s = htab->elf.srelplt->output_section;
4194 dyn.d_un.d_val = s->size;
4195 break;
4196
4197 case DT_RELASZ:
4198 /* The procedure linkage table relocs (DT_JMPREL) should
4199 not be included in the overall relocs (DT_RELA).
4200 Therefore, we override the DT_RELASZ entry here to
4201 make it not include the JMPREL relocs. Since the
4202 linker script arranges for .rela.plt to follow all
4203 other relocation sections, we don't have to worry
4204 about changing the DT_RELA entry. */
4205 if (htab->elf.srelplt != NULL)
4206 {
4207 s = htab->elf.srelplt->output_section;
4208 dyn.d_un.d_val -= s->size;
4209 }
4210 break;
4211
4212 case DT_TLSDESC_PLT:
4213 s = htab->elf.splt;
4214 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4215 + htab->tlsdesc_plt;
4216 break;
4217
4218 case DT_TLSDESC_GOT:
4219 s = htab->elf.sgot;
4220 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
4221 + htab->tlsdesc_got;
4222 break;
4223 }
4224
4225 (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
4226 }
4227
4228 /* Fill in the special first entry in the procedure linkage table. */
4229 if (htab->elf.splt && htab->elf.splt->size > 0)
4230 {
4231 /* Fill in the first entry in the procedure linkage table. */
4232 memcpy (htab->elf.splt->contents, elf_x86_64_plt0_entry,
4233 PLT_ENTRY_SIZE);
4234 /* Add offset for pushq GOT+8(%rip), since the instruction
4235 uses 6 bytes subtract this value. */
4236 bfd_put_32 (output_bfd,
4237 (htab->elf.sgotplt->output_section->vma
4238 + htab->elf.sgotplt->output_offset
4239 + 8
4240 - htab->elf.splt->output_section->vma
4241 - htab->elf.splt->output_offset
4242 - 6),
4243 htab->elf.splt->contents + 2);
4244 /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
4245 the end of the instruction. */
4246 bfd_put_32 (output_bfd,
4247 (htab->elf.sgotplt->output_section->vma
4248 + htab->elf.sgotplt->output_offset
4249 + 16
4250 - htab->elf.splt->output_section->vma
4251 - htab->elf.splt->output_offset
4252 - 12),
4253 htab->elf.splt->contents + 8);
4254
4255 elf_section_data (htab->elf.splt->output_section)->this_hdr.sh_entsize =
4256 PLT_ENTRY_SIZE;
4257
4258 if (htab->tlsdesc_plt)
4259 {
4260 bfd_put_64 (output_bfd, (bfd_vma) 0,
4261 htab->elf.sgot->contents + htab->tlsdesc_got);
4262
4263 memcpy (htab->elf.splt->contents + htab->tlsdesc_plt,
4264 elf_x86_64_plt0_entry,
4265 PLT_ENTRY_SIZE);
4266
4267 /* Add offset for pushq GOT+8(%rip), since the
4268 instruction uses 6 bytes subtract this value. */
4269 bfd_put_32 (output_bfd,
4270 (htab->elf.sgotplt->output_section->vma
4271 + htab->elf.sgotplt->output_offset
4272 + 8
4273 - htab->elf.splt->output_section->vma
4274 - htab->elf.splt->output_offset
4275 - htab->tlsdesc_plt
4276 - 6),
4277 htab->elf.splt->contents + htab->tlsdesc_plt + 2);
4278 /* Add offset for jmp *GOT+TDG(%rip), where TGD stands for
4279 htab->tlsdesc_got. The 12 is the offset to the end of
4280 the instruction. */
4281 bfd_put_32 (output_bfd,
4282 (htab->elf.sgot->output_section->vma
4283 + htab->elf.sgot->output_offset
4284 + htab->tlsdesc_got
4285 - htab->elf.splt->output_section->vma
4286 - htab->elf.splt->output_offset
4287 - htab->tlsdesc_plt
4288 - 12),
4289 htab->elf.splt->contents + htab->tlsdesc_plt + 8);
4290 }
4291 }
4292 }
4293
4294 if (htab->elf.sgotplt)
4295 {
4296 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4297 {
4298 (*_bfd_error_handler)
4299 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4300 return FALSE;
4301 }
4302
4303 /* Fill in the first three entries in the global offset table. */
4304 if (htab->elf.sgotplt->size > 0)
4305 {
4306 /* Set the first entry in the global offset table to the address of
4307 the dynamic section. */
4308 if (sdyn == NULL)
4309 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents);
4310 else
4311 bfd_put_64 (output_bfd,
4312 sdyn->output_section->vma + sdyn->output_offset,
4313 htab->elf.sgotplt->contents);
4314 /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
4315 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE);
4316 bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + GOT_ENTRY_SIZE*2);
4317 }
4318
4319 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize =
4320 GOT_ENTRY_SIZE;
4321 }
4322
4323 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4324 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
4325 = GOT_ENTRY_SIZE;
4326
4327 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4328 htab_traverse (htab->loc_hash_table,
4329 elf_x86_64_finish_local_dynamic_symbol,
4330 info);
4331
4332 return TRUE;
4333 }
4334
4335 /* Return address for Ith PLT stub in section PLT, for relocation REL
4336 or (bfd_vma) -1 if it should not be included. */
4337
4338 static bfd_vma
4339 elf_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
4340 const arelent *rel ATTRIBUTE_UNUSED)
4341 {
4342 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4343 }
4344
4345 /* Handle an x86-64 specific section when reading an object file. This
4346 is called when elfcode.h finds a section with an unknown type. */
4347
4348 static bfd_boolean
4349 elf_x86_64_section_from_shdr (bfd *abfd,
4350 Elf_Internal_Shdr *hdr,
4351 const char *name,
4352 int shindex)
4353 {
4354 if (hdr->sh_type != SHT_X86_64_UNWIND)
4355 return FALSE;
4356
4357 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
4358 return FALSE;
4359
4360 return TRUE;
4361 }
4362
4363 /* Hook called by the linker routine which adds symbols from an object
4364 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
4365 of .bss. */
4366
4367 static bfd_boolean
4368 elf_x86_64_add_symbol_hook (bfd *abfd,
4369 struct bfd_link_info *info,
4370 Elf_Internal_Sym *sym,
4371 const char **namep ATTRIBUTE_UNUSED,
4372 flagword *flagsp ATTRIBUTE_UNUSED,
4373 asection **secp,
4374 bfd_vma *valp)
4375 {
4376 asection *lcomm;
4377
4378 switch (sym->st_shndx)
4379 {
4380 case SHN_X86_64_LCOMMON:
4381 lcomm = bfd_get_section_by_name (abfd, "LARGE_COMMON");
4382 if (lcomm == NULL)
4383 {
4384 lcomm = bfd_make_section_with_flags (abfd,
4385 "LARGE_COMMON",
4386 (SEC_ALLOC
4387 | SEC_IS_COMMON
4388 | SEC_LINKER_CREATED));
4389 if (lcomm == NULL)
4390 return FALSE;
4391 elf_section_flags (lcomm) |= SHF_X86_64_LARGE;
4392 }
4393 *secp = lcomm;
4394 *valp = sym->st_size;
4395 return TRUE;
4396 }
4397
4398 if ((abfd->flags & DYNAMIC) == 0
4399 && ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4400 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4401
4402 return TRUE;
4403 }
4404
4405
4406 /* Given a BFD section, try to locate the corresponding ELF section
4407 index. */
4408
4409 static bfd_boolean
4410 elf_x86_64_elf_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED,
4411 asection *sec, int *index_return)
4412 {
4413 if (sec == &_bfd_elf_large_com_section)
4414 {
4415 *index_return = SHN_X86_64_LCOMMON;
4416 return TRUE;
4417 }
4418 return FALSE;
4419 }
4420
4421 /* Process a symbol. */
4422
4423 static void
4424 elf_x86_64_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED,
4425 asymbol *asym)
4426 {
4427 elf_symbol_type *elfsym = (elf_symbol_type *) asym;
4428
4429 switch (elfsym->internal_elf_sym.st_shndx)
4430 {
4431 case SHN_X86_64_LCOMMON:
4432 asym->section = &_bfd_elf_large_com_section;
4433 asym->value = elfsym->internal_elf_sym.st_size;
4434 /* Common symbol doesn't set BSF_GLOBAL. */
4435 asym->flags &= ~BSF_GLOBAL;
4436 break;
4437 }
4438 }
4439
4440 static bfd_boolean
4441 elf_x86_64_common_definition (Elf_Internal_Sym *sym)
4442 {
4443 return (sym->st_shndx == SHN_COMMON
4444 || sym->st_shndx == SHN_X86_64_LCOMMON);
4445 }
4446
4447 static unsigned int
4448 elf_x86_64_common_section_index (asection *sec)
4449 {
4450 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4451 return SHN_COMMON;
4452 else
4453 return SHN_X86_64_LCOMMON;
4454 }
4455
4456 static asection *
4457 elf_x86_64_common_section (asection *sec)
4458 {
4459 if ((elf_section_flags (sec) & SHF_X86_64_LARGE) == 0)
4460 return bfd_com_section_ptr;
4461 else
4462 return &_bfd_elf_large_com_section;
4463 }
4464
4465 static bfd_boolean
4466 elf_x86_64_merge_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
4467 struct elf_link_hash_entry **sym_hash ATTRIBUTE_UNUSED,
4468 struct elf_link_hash_entry *h,
4469 Elf_Internal_Sym *sym,
4470 asection **psec,
4471 bfd_vma *pvalue ATTRIBUTE_UNUSED,
4472 unsigned int *pold_alignment ATTRIBUTE_UNUSED,
4473 bfd_boolean *skip ATTRIBUTE_UNUSED,
4474 bfd_boolean *override ATTRIBUTE_UNUSED,
4475 bfd_boolean *type_change_ok ATTRIBUTE_UNUSED,
4476 bfd_boolean *size_change_ok ATTRIBUTE_UNUSED,
4477 bfd_boolean *newdef ATTRIBUTE_UNUSED,
4478 bfd_boolean *newdyn,
4479 bfd_boolean *newdyncommon ATTRIBUTE_UNUSED,
4480 bfd_boolean *newweak ATTRIBUTE_UNUSED,
4481 bfd *abfd ATTRIBUTE_UNUSED,
4482 asection **sec,
4483 bfd_boolean *olddef ATTRIBUTE_UNUSED,
4484 bfd_boolean *olddyn,
4485 bfd_boolean *olddyncommon ATTRIBUTE_UNUSED,
4486 bfd_boolean *oldweak ATTRIBUTE_UNUSED,
4487 bfd *oldbfd,
4488 asection **oldsec)
4489 {
4490 /* A normal common symbol and a large common symbol result in a
4491 normal common symbol. We turn the large common symbol into a
4492 normal one. */
4493 if (!*olddyn
4494 && h->root.type == bfd_link_hash_common
4495 && !*newdyn
4496 && bfd_is_com_section (*sec)
4497 && *oldsec != *sec)
4498 {
4499 if (sym->st_shndx == SHN_COMMON
4500 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) != 0)
4501 {
4502 h->root.u.c.p->section
4503 = bfd_make_section_old_way (oldbfd, "COMMON");
4504 h->root.u.c.p->section->flags = SEC_ALLOC;
4505 }
4506 else if (sym->st_shndx == SHN_X86_64_LCOMMON
4507 && (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
4508 *psec = *sec = bfd_com_section_ptr;
4509 }
4510
4511 return TRUE;
4512 }
4513
4514 static int
4515 elf_x86_64_additional_program_headers (bfd *abfd,
4516 struct bfd_link_info *info ATTRIBUTE_UNUSED)
4517 {
4518 asection *s;
4519 int count = 0;
4520
4521 /* Check to see if we need a large readonly segment. */
4522 s = bfd_get_section_by_name (abfd, ".lrodata");
4523 if (s && (s->flags & SEC_LOAD))
4524 count++;
4525
4526 /* Check to see if we need a large data segment. Since .lbss sections
4527 is placed right after the .bss section, there should be no need for
4528 a large data segment just because of .lbss. */
4529 s = bfd_get_section_by_name (abfd, ".ldata");
4530 if (s && (s->flags & SEC_LOAD))
4531 count++;
4532
4533 return count;
4534 }
4535
4536 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4537
4538 static bfd_boolean
4539 elf_x86_64_hash_symbol (struct elf_link_hash_entry *h)
4540 {
4541 if (h->plt.offset != (bfd_vma) -1
4542 && !h->def_regular
4543 && !h->pointer_equality_needed)
4544 return FALSE;
4545
4546 return _bfd_elf_hash_symbol (h);
4547 }
4548
4549 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
4550
4551 static bfd_boolean
4552 elf_x86_64_relocs_compatible (const bfd_target *input,
4553 const bfd_target *output)
4554 {
4555 return ((xvec_get_elf_backend_data (input)->s->elfclass
4556 == xvec_get_elf_backend_data (output)->s->elfclass)
4557 && _bfd_elf_relocs_compatible (input, output));
4558 }
4559
4560 static const struct bfd_elf_special_section
4561 elf_x86_64_special_sections[]=
4562 {
4563 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4564 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4565 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
4566 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4567 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
4568 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
4569 { NULL, 0, 0, 0, 0 }
4570 };
4571
4572 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
4573 #define TARGET_LITTLE_NAME "elf64-x86-64"
4574 #define ELF_ARCH bfd_arch_i386
4575 #define ELF_TARGET_ID X86_64_ELF_DATA
4576 #define ELF_MACHINE_CODE EM_X86_64
4577 #define ELF_MAXPAGESIZE 0x200000
4578 #define ELF_MINPAGESIZE 0x1000
4579 #define ELF_COMMONPAGESIZE 0x1000
4580
4581 #define elf_backend_can_gc_sections 1
4582 #define elf_backend_can_refcount 1
4583 #define elf_backend_want_got_plt 1
4584 #define elf_backend_plt_readonly 1
4585 #define elf_backend_want_plt_sym 0
4586 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
4587 #define elf_backend_rela_normal 1
4588
4589 #define elf_info_to_howto elf_x86_64_info_to_howto
4590
4591 #define bfd_elf64_bfd_link_hash_table_create \
4592 elf_x86_64_link_hash_table_create
4593 #define bfd_elf64_bfd_link_hash_table_free \
4594 elf_x86_64_link_hash_table_free
4595 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
4596 #define bfd_elf64_bfd_reloc_name_lookup \
4597 elf_x86_64_reloc_name_lookup
4598
4599 #define elf_backend_adjust_dynamic_symbol elf_x86_64_adjust_dynamic_symbol
4600 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
4601 #define elf_backend_check_relocs elf_x86_64_check_relocs
4602 #define elf_backend_copy_indirect_symbol elf_x86_64_copy_indirect_symbol
4603 #define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
4604 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
4605 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
4606 #define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
4607 #define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
4608 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
4609 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
4610 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
4611 #define elf_backend_relocate_section elf_x86_64_relocate_section
4612 #define elf_backend_size_dynamic_sections elf_x86_64_size_dynamic_sections
4613 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
4614 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
4615 #define elf_backend_plt_sym_val elf_x86_64_plt_sym_val
4616 #define elf_backend_object_p elf64_x86_64_elf_object_p
4617 #define bfd_elf64_mkobject elf_x86_64_mkobject
4618
4619 #define elf_backend_section_from_shdr \
4620 elf_x86_64_section_from_shdr
4621
4622 #define elf_backend_section_from_bfd_section \
4623 elf_x86_64_elf_section_from_bfd_section
4624 #define elf_backend_add_symbol_hook \
4625 elf_x86_64_add_symbol_hook
4626 #define elf_backend_symbol_processing \
4627 elf_x86_64_symbol_processing
4628 #define elf_backend_common_section_index \
4629 elf_x86_64_common_section_index
4630 #define elf_backend_common_section \
4631 elf_x86_64_common_section
4632 #define elf_backend_common_definition \
4633 elf_x86_64_common_definition
4634 #define elf_backend_merge_symbol \
4635 elf_x86_64_merge_symbol
4636 #define elf_backend_special_sections \
4637 elf_x86_64_special_sections
4638 #define elf_backend_additional_program_headers \
4639 elf_x86_64_additional_program_headers
4640 #define elf_backend_hash_symbol \
4641 elf_x86_64_hash_symbol
4642
4643 #undef elf_backend_post_process_headers
4644 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4645
4646 #include "elf64-target.h"
4647
4648 /* FreeBSD support. */
4649
4650 #undef TARGET_LITTLE_SYM
4651 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
4652 #undef TARGET_LITTLE_NAME
4653 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
4654
4655 #undef ELF_OSABI
4656 #define ELF_OSABI ELFOSABI_FREEBSD
4657
4658 #undef elf64_bed
4659 #define elf64_bed elf64_x86_64_fbsd_bed
4660
4661 #include "elf64-target.h"
4662
4663 /* Solaris 2 support. */
4664
4665 #undef TARGET_LITTLE_SYM
4666 #define TARGET_LITTLE_SYM bfd_elf64_x86_64_sol2_vec
4667 #undef TARGET_LITTLE_NAME
4668 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
4669
4670 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4671 objects won't be recognized. */
4672 #undef ELF_OSABI
4673
4674 #undef elf64_bed
4675 #define elf64_bed elf64_x86_64_sol2_bed
4676
4677 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
4678 boundary. */
4679 #undef elf_backend_static_tls_alignment
4680 #define elf_backend_static_tls_alignment 16
4681
4682 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4683
4684 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4685 File, p.63. */
4686 #undef elf_backend_want_plt_sym
4687 #define elf_backend_want_plt_sym 1
4688
4689 #include "elf64-target.h"
4690
4691 /* Intel L1OM support. */
4692
4693 static bfd_boolean
4694 elf64_l1om_elf_object_p (bfd *abfd)
4695 {
4696 /* Set the right machine number for an L1OM elf64 file. */
4697 bfd_default_set_arch_mach (abfd, bfd_arch_l1om, bfd_mach_l1om);
4698 return TRUE;
4699 }
4700
4701 #undef TARGET_LITTLE_SYM
4702 #define TARGET_LITTLE_SYM bfd_elf64_l1om_vec
4703 #undef TARGET_LITTLE_NAME
4704 #define TARGET_LITTLE_NAME "elf64-l1om"
4705 #undef ELF_ARCH
4706 #define ELF_ARCH bfd_arch_l1om
4707
4708 #undef ELF_MACHINE_CODE
4709 #define ELF_MACHINE_CODE EM_L1OM
4710
4711 #undef ELF_OSABI
4712
4713 #undef elf64_bed
4714 #define elf64_bed elf64_l1om_bed
4715
4716 #undef elf_backend_object_p
4717 #define elf_backend_object_p elf64_l1om_elf_object_p
4718
4719 #undef elf_backend_post_process_headers
4720 #undef elf_backend_static_tls_alignment
4721
4722 #undef elf_backend_want_plt_sym
4723 #define elf_backend_want_plt_sym 0
4724
4725 #include "elf64-target.h"
4726
4727 /* FreeBSD L1OM support. */
4728
4729 #undef TARGET_LITTLE_SYM
4730 #define TARGET_LITTLE_SYM bfd_elf64_l1om_freebsd_vec
4731 #undef TARGET_LITTLE_NAME
4732 #define TARGET_LITTLE_NAME "elf64-l1om-freebsd"
4733
4734 #undef ELF_OSABI
4735 #define ELF_OSABI ELFOSABI_FREEBSD
4736
4737 #undef elf64_bed
4738 #define elf64_bed elf64_l1om_fbsd_bed
4739
4740 #undef elf_backend_post_process_headers
4741 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4742
4743 #include "elf64-target.h"
4744
4745 /* 32bit x86-64 support. */
4746
4747 static bfd_boolean
4748 elf32_x86_64_elf_object_p (bfd *abfd)
4749 {
4750 /* Set the right machine number for an x86-64 elf32 file. */
4751 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
4752 return TRUE;
4753 }
4754
4755 #undef TARGET_LITTLE_SYM
4756 #define TARGET_LITTLE_SYM bfd_elf32_x86_64_vec
4757 #undef TARGET_LITTLE_NAME
4758 #define TARGET_LITTLE_NAME "elf32-x86-64"
4759
4760 #undef ELF_ARCH
4761 #define ELF_ARCH bfd_arch_i386
4762
4763 #undef ELF_MACHINE_CODE
4764 #define ELF_MACHINE_CODE EM_X86_64
4765
4766 #define bfd_elf32_bfd_link_hash_table_create \
4767 elf_x86_64_link_hash_table_create
4768 #define bfd_elf32_bfd_link_hash_table_free \
4769 elf_x86_64_link_hash_table_free
4770 #define bfd_elf32_bfd_reloc_type_lookup \
4771 elf_x86_64_reloc_type_lookup
4772 #define bfd_elf32_bfd_reloc_name_lookup \
4773 elf_x86_64_reloc_name_lookup
4774 #define bfd_elf32_mkobject \
4775 elf_x86_64_mkobject
4776
4777 #undef ELF_OSABI
4778
4779 #undef elf_backend_post_process_headers
4780
4781 #undef elf_backend_object_p
4782 #define elf_backend_object_p \
4783 elf32_x86_64_elf_object_p
4784
4785 #undef elf_backend_bfd_from_remote_memory
4786 #define elf_backend_bfd_from_remote_memory \
4787 _bfd_elf32_bfd_from_remote_memory
4788
4789 #undef elf_backend_size_info
4790 #define elf_backend_size_info \
4791 _bfd_elf32_size_info
4792
4793 #include "elf32-target.h"
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